U.S. patent application number 11/984602 was filed with the patent office on 2008-05-29 for fluid pressure control device.
Invention is credited to Matsuhisa Tsuruta.
Application Number | 20080121292 11/984602 |
Document ID | / |
Family ID | 39326542 |
Filed Date | 2008-05-29 |
United States Patent
Application |
20080121292 |
Kind Code |
A1 |
Tsuruta; Matsuhisa |
May 29, 2008 |
Fluid pressure control device
Abstract
A fluid pressure control device has a configuration in which
board-holding units and of a resin case are inserted and fitted to
mounting holes of a board to fix the board. The board-holding units
have a connector side board-holding unit provided at a position on
a connector housing side with respect to a connection portion, and
a solenoid side board-holding unit provided at a position on a
solenoid housing side with respect to the connection portion.
Inventors: |
Tsuruta; Matsuhisa;
(Toyota-city, JP) |
Correspondence
Address: |
POSZ LAW GROUP, PLC
12040 SOUTH LAKES DRIVE, SUITE 101
RESTON
VA
20191
US
|
Family ID: |
39326542 |
Appl. No.: |
11/984602 |
Filed: |
November 20, 2007 |
Current U.S.
Class: |
137/576 |
Current CPC
Class: |
B60T 17/04 20130101;
Y10T 137/86228 20150401; H05K 2201/105 20130101; B60T 8/3675
20130101; H05K 7/1417 20130101; H05K 3/306 20130101; H05K
2201/10424 20130101; H05K 2203/167 20130101; H05K 2201/1003
20130101; B60T 17/22 20130101 |
Class at
Publication: |
137/576 |
International
Class: |
E03B 11/00 20060101
E03B011/00 |
Foreign Application Data
Date |
Code |
Application Number |
Nov 24, 2006 |
JP |
2006-316548 |
Claims
1. A fluid pressure control device comprising: a body having a
fluid channel; a solenoid valve having a solenoid exposed to the
outside of the body, the solenoid valve for opening and closing the
fluid channel; a board on which an electronic component is
arranged, and to which a first end of a connector terminal is
connected; and a resin case to which the board is attached, the
case being fixed to the body, the case including: a connector
housing accommodating a second end of the connector terminal; a
solenoid housing aligned with the connector housing in a direction
parallel to the board and accommodating the solenoid; a connection
portion integrally formed with the housings, the connection portion
through which the housings are connected to each other, the
connection portion having a smaller external dimension in a
direction orthogonal to the board than those of the housings; and a
plurality of board-holding units which are inserted and fitted to a
plurality of mounting holes formed at the board, so that the board
is attached to the case, wherein the board-holding units include: a
connector side board-holding unit provided at a position on the
connector housing side of the connection portion; and a solenoid
side board-holding unit provided at a position on the solenoid
housing side of the connection portion.
2. The fluid pressure control device according to claim 1, wherein
a part of the solenoid side board-holding unit to be inserted and
fitted to a corresponding one of the mounting holes is elastically
deformable toward the center of the mounting hole.
3. The fluid pressure control device according to claim 2, wherein
the solenoid side board-holding unit is divided into a plurality of
pieces by a slit extending orthogonally to the board.
4. The fluid pressure control device according to claim 1, wherein:
the solenoid housing, the connection portion, and the connector
housing are aligned in a reference direction; and wherein the
solenoid side board-holding unit is disposed at a position in the
solenoid housing, and the position is farther from the connector
housing than the center of the solenoid housing in the reference
direction is.
5. The fluid pressure control device according to claim 1, wherein
a mounting-hole distance is smaller than a holding-unit distance,
provided that: one of the mounting holes to which the connector
side board-holding unit is inserted and fitted is a connector side
mounting hole, and another one of the mounting holes to which the
solenoid side board-holding unit is inserted and fitted is a
solenoid side mounting hole; the mounting-hole distance is a
distance between a position at a periphery of the connector side
mounting hole, the position being farthest from the solenoid side
mounting hole, and a position at a periphery of the solenoid side
mounting hole, the position being farthest from the connector side
mounting hole, and the holding-unit distance is a distance between
a position at an outer peripheral surface of the connector side
board-holding unit, the position being farthest from the solenoid
side board-holding unit, and a position at an outer peripheral
surface of the solenoid side board-holding unit, the position being
farthest from the connector side board-holding unit.
6. The fluid pressure control device according to claim 1, wherein
the connector side board-holding unit is press-fitted to a
corresponding one of the mounting holes.
7. The fluid pressure control device according to claim 1, wherein
the connector side board-holding unit is divided into a plurality
of pieces by a slit extending orthogonally to the board.
8. The fluid pressure control device according to claim 1, wherein
the connector side board-holding unit is the only member of the
board-holding units provided at a position on the connector housing
side of the connection portion.
9. The fluid pressure control device according to claim 1, wherein
the board-holding units includes a plurality of units provided at
positions on the connector housing side of the connection portion,
the plurality of units including the connector side board-holding
unit.
10. The fluid pressure control device according to claim 1,
wherein: the solenoid side board-holding unit is the only member of
the board-holding units provided at a position on the solenoid
housing side of the connection portion; and the solenoid side
board-holding unit has a convex portion which prevents the solenoid
side board-holding unit from slipping out of a corresponding one of
the mounting holes of the board.
11. The fluid pressure control device according to claim 9,
wherein: the solenoid side board-holding unit is the only member of
the board-holding units provided at a position on the solenoid
housing side of the connection portion; and the solenoid side
board-holding unit has a convex portion which prevents the solenoid
side board-holding unit from slipping out of a corresponding one of
the mounting holes of the board.
12. The fluid pressure control device according to claim 1, wherein
the fluid pressure control device is mounted on a vehicle, and
brake fluid flows through the fluid channel.
Description
CROSS REFERENCE TO RELATED APPLICATION
[0001] This application is based on and incorporates herein by
reference Japanese patent application No. 2006-316548 filed on Nov.
24, 2006.
FIELD OF THE INVENTION
[0002] The present invention relates to a fluid pressure control
device having a solenoid valve for opening and closing a fluid
channel, and a board on which an electronic component is arranged.
In particular, the present invention is suitable for a fluid
pressure control device for a vehicle brake system.
BACKGROUND OF THE INVENTION
[0003] FIG. 12 is a plan view showing a fluid pressure control
device for a vehicle brake system of a prior art in a state where a
board and a cover are removed. FIG. 13 is a cross-sectional view of
the fluid pressure control device taken along a line XIII-XIII of
FIG. 12. As shown in FIGS. 12 and 13, the fluid pressure control
device for the vehicle brake system of the prior art includes a
solenoid valve 2 for opening and closing a fluid channel through
which brake fluid flows, a board 5 on which electronic components
are arranged, a resin case 3 accommodating a solenoid 21 of the
solenoid valve 2 and fixing the board 5, and the like.
[0004] The board 5 has the electronic components arranged thereon.
An end of a connector terminal 6 is connected to the board 5. A
plurality of mounting holes are formed at the board 5. The case 3
has a solenoid housing 32 accommodating the solenoid 21, a
connector housing 33 accommodating a the other end of the connector
terminal 6, and a connection portion 34 through which the solenoid
housing 32 are connected to the connector housing 33. A plurality
of board-holding units 36 and 37 are also formed at the case 3 and
inserted and fitted to the mounting holes of the board 5 so as to
fix the board 5. The board-holding units 36 and 37 are respectively
provided at the connection portion 34 and the solenoid housing 32
(for example, see Japanese Unexamined Patent Application
Publication No. 2002-368452).
[0005] However, since the fluid pressure control device for the
vehicle brake system is generally mounted in an engine room of a
vehicle, the resin case 3 may be deformed by heat generated at an
engine. In particular, the connector housing 33 may noticeably warp
because the connector housing 33 extends from the solenoid housing
32 in an overhanging manner.
[0006] More specifically, the case 3 may be deformed such that the
connector housing 33 turns around an axis D of the connection
portion 34 with respect to the solenoid housing 32. Accordingly, a
solder bonding portion 7 between the connector terminal 6 and the
board 5 may be displaced in an F direction.
[0007] A component in an x direction of the displacement in the F
direction is restricted by the board-holding unit 37 provided at
the connection portion 34. Another component in a y direction of
the displacement causes a frictional resistance between the
board-holding unit 37 provided at the connection portion 34 and the
board 5. As a result, stresses are generated at the solder bonding
portion 7 in both the x and y directions, thereby making solder
cracking more likely to occur.
SUMMARY OF THE INVENTION
[0008] It is therefore an object of the present invention to reduce
a stress generated at a bonding portion between a connector
terminal and a board.
[0009] In an aspect of the present invention, a fluid pressure
control device includes a body having a fluid channel, a solenoid
valve having a solenoid exposed to the outside of the body. The
solenoid valve is for opening and closing the fluid channel. The
fluid pressure control device also includes a board and a resin
case. An electronic component is arranged on the board, and a first
end of a connector terminal is connected to the board. The board is
attached to the resin case, and the case is fixed to the body. The
case includes: a connector housing accommodating a second end of
the connector terminal; a solenoid housing aligned with the
connector housing in a direction parallel to the board and
accommodating the solenoid; a connection portion integrally formed
with the housings, the connection portion through which the
housings are connected to each other, the connection portion and
having a smaller external dimension (or thickness) in a direction
orthogonal to the board than those of the housings; and a plurality
of board-holding units which are inserted and fitted to a plurality
of mounting holes formed at the board, so that the board is
attached to the case. The board-holding units include a connector
side board-holding unit provided at a position on the connector
housing side with respect to the connection portion, and a solenoid
side board-holding unit provided at a position on the solenoid
housing side with respect to the connection portion.
[0010] Since a bonding portion between the connector terminal and
the board is located near the connector side board-holding unit,
the bonding portion is displaced with the connector side
board-holding unit when the case is deformed by a heat load.
Therefore, no relative displacement is generated in this occasion
between the bonding portion and the connector side board-holding
unit. Therefore, a resistance against the motion of the bonding
portion during the deformation of the case can be reduced, and a
stress generated at the bonding portion can be reduced.
[0011] A part of the solenoid side board-holding unit to be
inserted and fitted to a corresponding one of the mounting holes
may be elastically deformable toward the center of the mounting
hole.
[0012] When the case is deformed by a heat load, the board is
biased to rotate around the solenoid side board-holding unit, which
serves as a fulcrum. The above configuration makes the rotation of
the board easier, since the part of the solenoid side board-holding
unit to be inserted and fitted to the mounting hole may be
elastically deformable toward the center of the mounting hole.
Accordingly, the stress generated at the board and the bonding
portion can be reduced.
[0013] In addition, because of a reaction force against the elastic
deformation, the outer periphery of the solenoid side board-holding
unit can be firmly attached to the periphery of the solenoid side
mounting hole easily. As a result, positioning of the board in a
direction parallel to the board can be facilitated when the board
is assembled to the case.
[0014] The solenoid side board-holding unit may be divided into a
plurality of pieces by a slit extending orthogonally to the
board.
[0015] With this configuration, the board can easily rotate along
with the thermal deformation of the case since the elastic
deformation of the solenoid side board-holding unit is easily
achieved. Therefore, the resistance force against the motion of the
bonding portion during the deformation of the case can be further
reduced, and the stress generated at the board and the bonding
portion can be further reduced.
[0016] The solenoid housing, the connection portion, and the
connector housing, may be aligned in a reference direction. In this
situation, the solenoid side board-holding unit may be disposed at
a position in the solenoid housing wherein the position is farther
from the connector housing than the center of the solenoid housing
in the reference direction is.
[0017] With this configuration, the distance between the connector
side board-holding unit and the solenoid board holing unit becomes
large, that is, the radius of the rotation of the board during the
case deformation becomes large. Therefore, the angle of the
rotation of the board can be reduced, and accordingly the
resistance force against the motion of the bonding portion during
the deformation is further reduced. As a result, the stress
generated at the bonding portion is further reduced.
[0018] A mounting-hole distance may be smaller than a holding-unit
distance with the following four definitions. [0019] First
Definition: One of the mounting holes to which the connector side
board-holding unit is inserted and fitted is a connector side
mounting hole. [0020] Second Definition: The other one of the
mounting holes to which the solenoid side board-holding unit is
inserted and fitted is a solenoid side mounting hole. [0021] Third
definition: The mounting-hole distance is a distance between a
position at a periphery of the connector side mounting hole, the
position being farthest from the solenoid side mounting hole, and a
position at a periphery of the solenoid side mounting hole, the
position being farthest from the connector side mounting hole.
[0022] Fourth Definition: The holding-unit distance is a distance
between a position at an outer peripheral surface of the connector
side board-holding unit, the position being farthest from the
solenoid side board-holding unit, and a position at an outer
peripheral surface of the solenoid side board-holding unit, the
position being farthest from the connector side board-holding
unit.
[0023] With this configuration, the board-holding units are
partially press-fitted to the mounting holes. Therefore, the board
is reliably fixed to the case when the board-holding units are
inserted and fitted to the mounting holes.
[0024] The connector side board-holding unit may be press-fitted to
a corresponding one of the mounting hole.
[0025] With this configuration, the board is reliably fixed to the
case when the connector side board-holding unit is inserted and
fitted to the mounting hole.
[0026] The connector side board-holding unit may be divided into a
plurality of pieces by a slit extending orthogonally to the
board.
[0027] The only one connector side board-holding unit may be
provided. In other words, the connector side board-holding unit may
be the only member of the board-holding units provided at a
position on the connector housing side with respect to the
connection portion.
[0028] With this configuration as compared with, for example, a
case where a plurality of the connector side board-holding units
are provided, the space for arranging the connector terminal can be
easily obtained.
[0029] Otherwise, a plurality of the connector side board-holding
units may be provided. In other words, the holding units may
include a plurality of units provided at positions on the connector
housing side of the connection portion, wherein the connector side
board-holding unit is a member of the plurality of units.
[0030] With this configuration, as compared with, for example a
case where the only one connector side board-holding unit is
provided, the inclination of the board with respect to the case
during assembling can be reduced.
[0031] The only one solenoid side board-holding unit may be
provided. In other words, solenoid side board-holding unit may the
only member of the board-holding units provided at a position on
the solenoid housing side of the connection portion. In this
situation, the solenoid side board-holding unit may have a convex
portion which prevents the solenoid side board-holding unit from
slipping out of a corresponding one of the mounting holes of the
board.
[0032] With this configuration, the only one solenoid side
board-holding unit having the protrusion is provided. Therefore as
compared with, for example, a case where a plurality of the
solenoid side board-holding units are provided, a restriction force
against the rotation of the board caused by the protrusion during
the deformation becomes small. As a result, the resistance force
against the motion of the board during the deformation is reduced,
and the stress generated at the board and the bonding portion can
be reduced.
[0033] The above-described fluid pressure control device may be
mounted on a vehicle, and brake fluid may flow through the fluid
channel.
BRIEF DESCRIPTION OF THE DRAWINGS
[0034] The invention, together with additional objective, features
and advantages thereof, will be best understood from the following
description, the appended claims and the accompanying drawings. In
the drawings:
[0035] FIG. 1 is a plan view showing a fluid pressure control
device according to a first embodiment of the present invention in
a state where a board and a cover are removed;
[0036] FIG. 2 is a cross-sectional view of the fluid pressure
control device taken along a line II-II of FIG. 1;
[0037] FIG. 3 is a cross-sectional view showing a portion B of FIG.
2;
[0038] FIG. 4 is a plan view showing a solenoid side board-holding
unit 36 of FIG. 1;
[0039] FIG. 5 is a cross-sectional view taken along a line V-V of
FIG. 4;
[0040] FIG. 6 is a plan view showing a board of FIG. 2;
[0041] FIG. 7 is a cross-sectional view of the fluid pressure
control device taken along the line II-II of FIG. 1 in a state
where a case is thermally deformed;
[0042] FIG. 8 is a cross-sectional view showing a primary portion
of a fluid pressure control device according to a second embodiment
of the present invention;
[0043] FIG. 9 is a cross-sectional view showing a primary portion
of a fluid pressure control device according to a third embodiment
of the present invention;
[0044] FIG. 10 is a plan view showing a case of a fluid pressure
control device according to a fourth embodiment of the present
invention;
[0045] FIG. 11 is a plan view showing a case of a fluid pressure
control device according to a fifth embodiment of the present
invention;
[0046] FIG. 12 is a plan view showing a conventional fluid pressure
control device for a vehicle brake system in a state where a board
and a cover are removed; and
[0047] FIG. 13 is a cross-sectional view of the conventional fluid
pressure control device taken along a line XIII-XIII of FIG.
12.
DETAILED DESCRIPTION OF THE EMBODIMENTS
First Embodiment
[0048] A first embodiment of the present invention is described
below. The fluid pressure control device of this embodiment is used
for a vehicle brake system that controls a braking force of a
vehicle by controlling a brake fluid-pressure. Note that a vertical
direction in FIG. 1 represents a vertical direction when the fluid
pressure control device is mounted on the vehicle.
[0049] As shown in FIGS. 1 and 2, the fluid pressure control device
includes a metal body 1 in which a fluid channel (not shown)
through which brake fluid flows is formed. The body 1 has a
plurality of solenoid valves 2 for opening and closing the fluid
channel, a pump (not shown) for sucking and discharging the brake
fluid, an electrical motor (not shown) for driving the pump, and
the like.
[0050] Solenoids 21 of the solenoid valves 2 are fixed to a side
surface of the body 1 by calking or the like. The solenoids 21 are
exposed to the outside of the body 1. A resin case 3 is fixed to
the body 1 using a screw (not shown) to cover the solenoid 21.
[0051] A coil wire (not shown) of each solenoid 21 is soldered to a
solenoid terminal 22. The solenoid terminal 22 penetrates through a
terminal hole 31 of the case 3 and extends to a below-described
board housing chamber. A sealing member (not shown) is applied
between the solenoid terminal 22 and the terminal hole 31 for
sealing. In particular, for example, a flexible sealing member,
such as silicon, is used to allow the solenoid terminal 22 to be
easily displaced. The solenoid terminal 22 has a clinched part 221
which is bent into a crank-like shape so that the solenoid terminal
22 can be elastically deformed easily. The clinched part 221 is
located in a below-described solenoid housing.
[0052] A resin cover 4 is bonded to the case 3 by welding or the
like on the side of the case 3 opposite to the body 1. The case 3
and the cover 4 define a board housing chamber 41. A plate-like
board 5 is accommodated in the board housing chamber 41. The board
5 has electronic components (not shown) on its surface. First ends
of a plurality of connector terminals 6 which are formed at the
case 3 by insert molding are soldered to the board 5, and also, the
solenoid terminal 22 is soldered to the board 5.
[0053] The case 3 has a substantially rectangular parallelepiped
solenoid housing 32 providing a space for accommodating the
solenoids 21, a substantially rectangular parallelepiped connector
housing 33 providing a space for accommodating second ends of the
connector terminals 6, and a plate-like connection portion 34
through which the solenoid housing 32 is connected to the connector
housing 33. The housings 32 and 33, and the connection portion 34
are integrally formed.
[0054] The housings 32 and 33, and the connection portion 34 are
aligned in a direction (hereinafter referred to as a plate-face
direction) parallel to the board 5. An external dimension of the
connection portion 34 in a direction orthogonal to the plate-face
direction of the board 5 is smaller than external dimensions of the
housings 32 and 33 in the direction orthogonal to the
plate-face-direction of the board 5.
[0055] In the case 3, a connector side board-holding unit 35
protruding toward the board 5 is formed at a position on the
connector housing 33 side with respect to the connection portion
34, and two solenoid side board-holding units 36 protruding toward
the board 5 are formed at positions on the solenoid housing 32 side
with respect to the connection portion 34.
[0056] Hereinafter, a reference direction is defined to be an
alignment direction of the solenoid housing 32, connection portion
34 and connector housing 33 (in this embodiment, a horizontal
direction of FIGS. 1 and 2). The connector side board-holding unit
35 is disposed at a position near the center of the connector
housing 33 in the reference direction Z. The solenoid side
board-holding units 36 are disposed at positions in the solenoid
housing 32, the positions being farther from the connector housing
33 than the center of the solenoid housing 32 in the reference
direction Z is.
[0057] In addition, the two solenoid side board-holding units 36
are arranged away from each other in a direction orthogonal to the
reference direction Z (in this embodiment, the vertical direction
of FIG. 1). Hereinafter, if necessary, one of the two solenoid side
board-holding units 36 located on the lower side in FIG. 1 is
referred to as a first solenoid side board-holding unit 36a, and
the other one located on the upper side in FIG. 1 is referred to as
a second solenoid side board-holding unit 36b.
[0058] As shown in FIG. 6, the board Includes three hole forming
portions, each forming and surrounding a connector side mounting
hole 51 and two solenoid side mounting holes 52. The connector side
mounting hole 51 are formed at a position corresponding to the
connector side board-holding unit 35, and the connector side
board-holding unit 35 is inserted and fitted to the connector side
mounting hole 51. Each of the solenoid side mounting holes 52 are
formed at a position corresponding to each of the solenoid side
board-holding units 36, and the solenoid side board-holding units
36 are inserted and fitted respectively to the solenoid side
mounting holes 52. The board-holding units 35 and 36 are inserted
and fitted to the mounting holes 51 and 52, and accordingly, the
board 5 is held by the case 3. Hereinafter one of the two solenoid
side mounting holes 52 to which the first solenoid side
board-holding unit 36a is inserted and fitted is referred to as a
first solenoid side mounting hole 52a, and the other one to which
the second solenoid side board-holding unit 36b is inserted and
fitted is referred to as a second solenoid side mounting hole
52b.
[0059] In addition, ones of the hole forming portions corresponding
to the connector side mounting hole 51, a first solenoid side
mounting hole 52a, and a second solenoid side mounting hole 52a are
respectively referred to as a connector hole forming portion, a
first solenoid hole forming portion, and a second solenoid hole
forming portion.
[0060] As shown in FIG. 3, the connector side board-holding unit 35
includes a column-shaped large-diameter column part 351 and a
column-shaped small-diameter column part 352 protruding and
extending from an end of the large-diameter column part 351. The
outer diameter of the large-diameter column part 351 is larger than
the diameter of the connector side mounting hole 51 (i.e. the inner
diameter of the connector hole forming portion). The outer diameter
of the small-diameter column part 352 is smaller than the diameter
of the connector side mounting hole 51. The small-diameter column
part 352 is inserted and fitted to the connector side mounting hole
51.
[0061] As shown in FIGS. 4 and 5, each of the solenoid side
board-holding units 36 has a cylindrical supporting part 361 with
an external diameter larger than the diameter of the solenoid side
mounting hole 52 (i.e. the inner diameter of solenoid hole forming
portion), and an insertion part 362 protruding and extending from
the supporting part 361 and being inserted and fitted to the
solenoid side mounting hole 52.
[0062] The insertion part 362 has a columnar shape at a portion
near the supporting part 361, and has a shape of a truncated cone
at a portion near a tip end thereof. The outer diameter of the
columnar portion of the insertion part 362 is smaller than the
diameter of the solenoid side mounting hole 52. The outer diameter
of the truncated-cone portion at the tip end of the insertion part
362 (i.e. a minimum outer diameter) is smaller than the diameter of
the solenoid side mounting hole 52. A convex portion 362a is
provided at the truncated-cone portion of the insertion part 362 at
a position near the supporting part 361. The outer diameter of the
convex portion 362a is the largest in the truncated-cone portion,
and is larger than the diameter of the solenoid side mounting hole
52. The insertion part 362 is divided into two pieces by a slit 363
extending orthogonal to the board 5. Because of this, the insertion
part 362 is easily elastically deformable toward the center of the
solenoid side mounting hole 52.
[0063] Herein, as shown in FIG. 6, a mounting-hole distance H is
defined as a distance between a first inner peripheral position and
a second inner peripheral position. The first inner peripheral
position is at a periphery of the connector side mounting hole 51
(i.e. an inner peripheral surface of the connector hole forming
portion) and is farthest from the first solenoid side mounting hole
52a than any other position at the periphery of the connector side
mounting hole 51 is. The second inner peripheral position is at a
periphery of the first solenoid side mounting hole 52a (i.e. an
inner peripheral surface of the first solenoid hole forming
portion) and is farthest from the connector side mounting hole 51
than any other position at the periphery of the first solenoid side
mounting hole 52a is. Also, as shown in FIG. 1, a holding-unit
distance L is defined as a distance between a first outer
peripheral position and a second outer peripheral position. The
first outer peripheral position is at an outer peripheral surface
of the small-diameter column part 352 of the connector side
board-holding unit 35 and is farthest from the first solenoid side
board-holding unit 36a than any other position at the outer
peripheral surface of the small-diameter column part 352. The
second outer peripheral position is at an outer peripheral surface
of the insertion part 362 of the first solenoid side board-holding
unit 36a and is farthest from the connector side board-holding unit
35 than any other position at an outer peripheral surface of the
insertion part 362 is.
[0064] The mounting-hole distance H is smaller than the
holding-unit distance L. As described above, in the case where the
mounting-hole distance H is smaller than the holding-unit distance
L, a portion of the connector side board-holding unit 35 is
press-fitted to the connector hole forming portion, and a portion
of the first solenoid side board-holding unit 36a is also
press-fitted to the first solenoid hole forming portion.
Accordingly, at the time when the board-holding units 35 and 36 are
inserted and fitted to the mounting holes 51 and 52, the board 5 is
reliably fixed to the case 3. Therefore, even when the board 5 is
located below the case 3 when being soldered, the board 5 is not
detached from the case 3. Meanwhile, the second solenoid side
board-holding unit 36b is not press-fitted to the second solenoid
hole forming portion.
[0065] Since the fluid pressure control device according to this
embodiment is mounted in an engine room (not shown) of the vehicle,
the resin case 3 may be deformed by heat generated at an engine
(not shown). FIG. 7 is a cross-sectional view of the fluid pressure
control device taken along the line A-A of FIG. 1 and shows a state
where the case 3 is thermally deformed.
[0066] As shown in FIG. 7, in the case 3, the connector housing 33
is deformed to rotate in the clockwise direction in FIG. 7 around
an axis D of the connection portion 34 with respect to the solenoid
housing 32. Due to this, a bonding portion 7 between the connector
terminals 6 and the board 5 may be displaced in x and y directions
shown in in FIG. 7.
[0067] Since the bonding portion 7 between the connector terminals
6 and the board 5 is located near the connector side board-holding
unit 35 the bonding portion 7 is displaced with the connector side
board-holding unit 35 when the case 3 Is deformed by a heat load.
Therefore, no relative displacement is generated between the
bonding portion 7 and the connector side board-holding unit 35. As
a result, a resistance against the motion of the bonding portion 7
during the case deformation is reduced, and a stress generated at
the bonding portion 7 is reduced, thereby hardly causing solder
cracking.
[0068] In addition, when the case 3 is deformed by the heat load,
the board 5 likely turns around the solenoid side board-holding
unit 36 as a fulcrum, which serves as a fulcrum. Since the
insertion part 362 of the solenoid side board-holding unit 36 is
divided by the slit 363 and thus elastically deformable, that is,
since the solenoid side board-holding unit 36 allows the board 5 to
easily rotate along With the thermal deformation of the case 3, the
resistance against the motion of the bonding portion 7 during the
case deformation can be further reduced.
[0069] In addition, because of reaction of the elastic deformation,
the outer periphery of the solenoid side board-holding unit 36 can
closely comes in contact with the inner periphery of the solenoid
hole forming portion easily. As a result, positioning of the board
5 in the plate-face direction can be facilitated when being
assembled to the case 3.
[0070] The solenoid side board-holding unit 36 is disposed in the
solenoid housing 32 on the side opposite to the connector housing
33 with respect to the center in the reference direction Z, and the
distance between the connector side board-holding unit 35 and the
solenoid side board-holding unit 36 is large. Therefore the radius
of rotation of the board 5 during the case deformation is large,
and the angle of rotation of the board 5 during the case
deformation accordingly becomes small. As a result, the amount of
deformation of the insertion part 362 of the solenoid side
board-holding unit 36 becomes small, and the resistance against the
motion of the bonding portion 7 during the case deformation is
further reduced.
[0071] Since the solenoid side board-holding unit 36 is loosely
fitted to the solenoid side mounting hole 52, the board 5 can be
easily displaced in the x direction along with the thermal
deformation of the case 3. Accordingly, the resistance against the
motion of the bonding portion 7 during the case deformation can be
further reduced.
[0072] Since the sealing member applied between the solenoid
terminal 22 and the terminal hole 31 is flexible, and the clinched
part 221 is provided for allowing the solenoid terminal 22 to be
easily elastically deformed, the solenoid terminal 22 can be easily
displaced in the x and y directions, thereby reducing the
resistance against the motion of the board 5 during the case
deformation.
[0073] In this embodiment, the connector side board-holding unit 35
is the only unit of the case 3 which is to be inserted and fitted
to a mounting hole of the board 5 and which is provided at the
connector housing 33 side with respect to the connection portion
34. Therefore, as compared with a case where a plurality of
connector side board-holding units having the same feature as the
connector side board-holding unit 35 are provided, the space for
arranging the connector terminal 6 can be easily obtained.
Second Embodiment
[0074] A second embodiment of the present invention is described
below. FIG. 8 is a cross-sectional view showing a primary portion
of a fluid pressure control device according to this embodiment.
The present embodiment is different from the first embodiment in
that the dimensional relationship between the connector side
board-holding unit 35 and the connector side mounting hole 51 is
changed. A part shown in this embodiment is identical or equivalent
to a part in the first embodiment if the same reference numeral is
applied to the two parts. Descriptions for such a part are omitted
in this embodiment.
[0075] As shown in FIG. 8, the outer diameter of the small-diameter
column part 352 of the connector side board-holding unit 35 is
larger than the diameter of the connector side mounting hole 51,
and is press-fitted to the connector side mounting hole 51.
Accordingly, the board 5 is firmly fixed to the case 3 at the time
when the connector side board-holding unit 35 is press-fitted to
the connector side mounting hole 51.
[0076] In this embodiment, the mounting-hole distance H does not
have to be smaller than the holding-unit distance L.
Third Embodiment
[0077] A third embodiment of the present invention is described
below. FIG. 9 is a cross-sectional view showing a primary portion
of a fluid pressure control device according to this embodiment.
The present embodiment is different from the first embodiment in
that the shape of the connector side board-holding unit 35 is
changed. A part shown in this embodiment is identical or equivalent
to a part in the first embodiment if the same reference numeral is
applied to the two parts. Descriptions for such a part are omitted
in this embodiment.
[0078] As shown in FIG. 9, the connector side board-holding unit 35
has a cylindrical supporting part 353 with an external diameter
larger than the diameter of the connector side mounting hole 51,
and an insertion part 354 protruding and extending from the
supporting part 353 and being inserted and fitted to the connector
side mounting hole 51.
[0079] The insertion part 354 has a columnar shape at a portion
near the supporting part 353, and has a shape of a truncated cone
shape at a portion near a tip end thereof. The outer diameter of
the columnar portion of the insertion part 354 is smaller than the
diameter of the connector side mounting hole 51. The outer diameter
of the truncated-cone portion at the tip end of the insertion part
354 (i.e. a minimum outer diameter) is smaller than the diameter of
the connector side mounting hole 51. The outer diameter of the
truncated-cone portion of the insertion part 354 near the
supporting part 353 (i.e. a maximum outer diameter) is larger than
the diameter of the connector side mounting hole 51. The insertion
part 354 is divided into two pieces by a slit 355 extending
orthogonally to the board 5, thereby being easily elastically
deformable.
[0080] In this embodiment, the mounting-hole distance H does not
have to be smaller than the holding-unit distance L.
Fourth Embodiment
[0081] A fourth embodiment of the present invention is described
below. FIG. 10 is a plan view showing a case of a fluid pressure
control device according to this embodiment. The present embodiment
is different from the first embodiment in that the number of
connector side board-holding units 35 is changed. A part shown in
this embodiment is identical or equivalent to a part in the first
embodiment if the same reference numeral is applied to the two
parts. Descriptions for such a part are omitted in this
embodiment.
[0082] As shown in FIG. 10, the case 3 has two connector side
board-holding units 35 having the same feature as the connector
side board-holding unit in the first embodiment. Though not shown,
the board 5 has two connector hole forming unit respectively
forming and surrounding two connector side mounting holes 51.
Accordingly as compared with, for example, a case where only one
connector side board-holding unit 35 is provided, the inclination
of the board 5 with respect to the case 3 during assembling can be
reduced.
Fifth Embodiment
[0083] A fifth embodiment of the present invention is described
below. FIG. 11 is a plan view-showing a case of a fluid pressure
control device according to this embodiment. The present embodiment
is different from the fourth embodiment in that the number of
solenoid side board-holding units 36 is changed. A part shown in
this embodiment is identical or equivalent to a part in the first
embodiment if the same reference numeral is applied to the two
parts. Descriptions for such a part are omitted in this
embodiment.
[0084] As shown in FIG. 11, the case 3 has only one of the solenoid
side board-holding units 36 in the first embodiment. Though not
shown, the board 5 has the only one solenoid hole forming portion
and the only one solenoid side mounting hole 52 for the only
solenoid side board-holding unit 36 in this embodiment.
[0085] Accordingly, since there is provided the only one solenoid
side board-holding unit 36 having the convex portion 362a as
compared with, for example, a case where a plurality of solenoid
side board-holding units 36 are provided, a restriction force
against the turning of the board 5 caused by the convex portion
362a during the case deformation becomes small. As a result, the
resistance against the motion of the board 5 during the case
deformation is reduced, and the stress generated at the board 5 and
the bonding portion 7 can be reduced.
Other Embodiment
[0086] Although the fluid pressure control device for the vehicle
brake system is described in the above embodiments, the present
invention may be also applied to fluid pressure control device s
for other purposes.
* * * * *