U.S. patent application number 09/221166 was filed with the patent office on 2001-11-29 for electromagnetic brake.
This patent application is currently assigned to BROWN, THOMAS E. Invention is credited to HIKARI, KAZUO.
Application Number | 20010045331 09/221166 |
Document ID | / |
Family ID | 12559055 |
Filed Date | 2001-11-29 |
United States Patent
Application |
20010045331 |
Kind Code |
A1 |
HIKARI, KAZUO |
November 29, 2001 |
ELECTROMAGNETIC BRAKE
Abstract
An electromagnetic brake provided with a braking force receiving
bracket for receiving tangent force of a pair of brake shoes
reciprocating in approaching and parting directions mutually. The
braking force receiving bracket is fixed to a fixation member,
slide faces, which receive side faces of the pair of brake shoes as
the brake shoes can slide, are provided on inner sides of the above
bracket, and the above pair of brake shoes are surrounded by the
bracket.
Inventors: |
HIKARI, KAZUO; (OSAKA,
JP) |
Correspondence
Address: |
ARMSTRONG,WESTERMAN, HATTORI,
MCLELAND & NAUGHTON, LLP
1725 K STREET, NW, SUITE 1000
WASHINGTON
DC
20006
US
|
Assignee: |
BROWN, THOMAS E
|
Family ID: |
12559055 |
Appl. No.: |
09/221166 |
Filed: |
December 28, 1998 |
Current U.S.
Class: |
188/161 |
Current CPC
Class: |
F16D 2055/0008 20130101;
F16D 2055/0041 20130101; F16D 59/02 20130101; F16D 65/0979
20130101; F16D 2125/587 20130101; F16D 2121/22 20130101; F16D
55/227 20130101; F16D 55/22655 20130101; F16D 65/46 20130101 |
Class at
Publication: |
188/161 |
International
Class: |
B60L 007/00 |
Foreign Application Data
Date |
Code |
Application Number |
Feb 5, 1998 |
JP |
10-039653 |
Claims
What is claimed is:
1. An electromagnetic brake comprising a braking force receiving
bracket for receiving tangent force of one pair of brake shoes
mutually reciprocating in approaching and parting directions.
2. The electromagnetic brake as set forth in claim 1, wherein the
braking force receiving bracket is fixed to a fixation member,
slide faces receiving side faces of the pair of brake shoes as to
slide are formed on inner sides of the bracket, and the brake shoes
are surrounded and held by the bracket.
3. An electromagnetic brake comprising a construction in which: a
plate body is disposed next to an electromagnet portion with a
predetermined interval; a fixed iron core of the electromagnet
portion and the plate body are connected and united with plural
guiding rods, and a braking force receiving bracket for receiving
one pair of brake shoes and tangent force of the pair of brake
shoes is disposed between the electromagnet portion and the plate
body; and the braking force receiving bracket is fixed to a
fixation member.
4. An electromagnetic brake comprising a construction in which: a
plate body is disposed next to an electromagnet portion with a
predetermined interval; a fixed iron core of the electromagnet
portion and the plate body are connected and united with plural
guiding rods, and a braking force receiving bracket for receiving
one pair of brake shoes and tangent force of the pair of brake
shoes is disposed between the electromagnet portion and the plate
body; the braking force receiving bracket is fixed to a fixation
member; one of the pair of brake shoes is attached to a movable
iron core side of the electromagnet portion through a centripetal
coupling, and the other of the pair of brake shoes is attached to
the plate body side through an adjusting screw and a centripetal
coupling; and concave and convex contact faces of each of the
centripetal couplings are held tightly fitting by one pair of
return springs, continuously pushing the brake shoes in directions
that the brake shoes mutually part from, each of which is disposed
between each of the brake shoes and the bracket.
5. An electromagnetic brake comprising a construction in which: a
unit is composed of an electromagnet portion, a plate body, and
plural guiding rods which connect and unite the electromagnet
portion and the plate body keeping a predetermined interval between
the electromagnet portion and the plate body; a braking force
receiving bracket for receiving tangent force of one pair of brake
shoes is disposed between the electromagnet portion and the plate
body of the unit; the unit is attached to the bracket as to be able
to float for a micro dimension; and centering of the unit on a
braked body is conducted by elastic members, which elastically push
the plate body in a direction that the plate body parts from the
bracket, and regulating members, which regulate the plate body not
to excessively move in the parting direction of the plate body.
Description
BACKGROUND OF THE INVENTION
[0001] 1. Field of the Invention
[0002] This invention relates to an electromagnetic brake mainly
used for a hoist gear.
[0003] 2. Description of the Related Art
[0004] As a conventional electromagnetic brake has been used for a
hoist gear, etc., a brake having a construction as shown in FIG. 9
and FIG. 10 is known.
[0005] That is to say, as shown in FIG. 9 and FIG. 10, in a
conventional electromagnetic brake, a U-shaped caliper 61 and an
electromagnet portion 62 form a unit 63, and this unit 63 is
attached to a fixation member 65 (for attachment) through a
floating pin 64.
[0006] A brake shoe 66 is attached to an end of the U-shaped
caliper 61 through an adjusting screw 67, etc., and another brake
shoe 68 is attached to an end of a push rod 69. This push rod 69 is
fixed to a movable iron core 70 of the electromagnet portion 62,
and the other end of the caliper 61 is fixed and connected to a
fixed iron core 72 of the electromagnet portion 62 through an
attachment bolt 71.
[0007] When the electromagnet portion 62 is switched on, a braked
body 73 such as a disk, shown with a two-dot broken line, pressed
by the above-mentioned pair of brake shoes 66 and 68, performs
brake-working. In this case, pressing force G of the brake shoe 66,
pressing force H of the brake shoe 68, and tangent force (working
in a direction at right angles with surface of FIG. 9 or FIG. 10)
are transmitted through the adjusting screw 67, the caliper 61, the
push rod 69, and the movable iron core 70.
[0008] However, in a conventional electromagnetic brake as
described above, a U-shaped large-volume caliper of block, having
sufficient strength and rigidity, is required. And, there is a
problem that construction of the brake becomes complicated, and
width dimension of the brake in FIG. 9 and FIG. 10 becomes
enlarged.
[0009] It is therefore an object of the present invention to
provide an electromagnetic brake with which the large-volume
caliper of block is not necessary, light-weight apparatus in total
and simplification of the construction can be obtained.
BRIEF DESCRIPTION OF THE DRAWINGS
[0010] The present invention will be described with reference to
the accompanying drawings, in which:
[0011] FIG. 1 is a left side view showing a preferred embodiment of
the present invention;
[0012] FIG. 2 is a front view showing the preferred embodiment of
the present invention;
[0013] FIG. 3 is a front view showing the preferred embodiment of
the present invention with a part of cross-section;
[0014] FIG. 4A is an explanatory view showing an example of a
braking force receiving bracket;
[0015] FIG. 4B is an explanatory view showing the example of the
braking force receiving bracket;
[0016] FIG. 4C is an explanatory view showing the example of the
braking force receiving bracket;
[0017] FIG. 5 is an explanatory view with cross-section of a
principal port ion;
[0018] FIG. 6 is an explanatory view with cross-section of a
principal port ion;
[0019] FIG. 7 is an explanatory view with cross-section of a
principal port ion;
[0020] FIG. 8 is an explanatory view with cross-section of a
principal portion;
[0021] FIG. 9 is a front view showing a conventional example;
and
[0022] FIG. 10 is a cross-sectional front view showing the
conventional example.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
[0023] Preferred embodiments of the present invention will now be
described with reference to the accompanying drawings.
[0024] In a left side view of FIG. 1, a front view of FIG. 2, and a
front view with a part of cross-section of FIG. 3, this
electromagnetic brake has a construction in which a conventional
caliper is omitted, and a unit U is formed instead by that a plate
body 2 is arranged approximately parallel to an electromagnet
portion 1 with a predetermined interval, and a fixed iron core 3 of
the electromagnet portion 1 and the plate body 2 are connected and
united through plural guiding rods 4.
[0025] A braking force receiving bracket 8, for receiving tangent
force F.sub.t of one pair of brake shoes 6 and 7, is arranged
between the electromagnet portion 1 and the plate body 2 of the
unit U.
[0026] 9 shows a braked body such as a disc (discoid), a plate
piece (of belt plate), etc. braked by press of the above-mentioned
brake shoes 6 and 7. In the present invention, the tangent force
F.sub.t is, among the force the brake shoes 6 and 7 receive from
the braked body 9 in braking, a force in running direction of the
braked body 9.
[0027] In case that the braked body 9 rotationally moves, namely,
is a disc, a force in a direction of tangent line works on the
brake shoes 6 and 7. This is called tangent force F.sub.t which is
shown in FIG. 1 with an arrow. And, in case that the braked body 9
linearly moves, the tangent force is in a direction of the linear
movement.
[0028] And, the braking force receiving bracket 8 is fixed to a
fixation member 10 such as a base (base frame) of a hoist gear, a
building, etc. That is to say, the former-described unit U is
attached to the fixation member 10 through the bracket 8.
[0029] The bracket 8 is, as shown in FIG. 4, having a concave
groove 11 to which the braked body 9 is inserted, and arch-shaped
as a whole as shown in a front view of FIG. 4A. And, each of left
and right leg portions 12 is bifurcated into two branches by the
existence of the above concave groove 11. And, a fitting portion 13
with tapped holes is formed on a lower end portion of the leg
portion 12, and the bracket 8 is fixed to the above-mentioned
fixation member 10 (as shown in FIG. 1 through FIG. 3) by screwing
bolts into the tapped holes.
[0030] And, the brake shoes 6 and 7 are held within an inner space
15 surrounded by the left and right leg portions 12 of the
arch-shaped bracket 8 and an upper side portion 14. In FIG. 5
through FIG. 8, each of the brake shoes 6 and 7 is composed of a
brake pad portion 16 which contacts the braked body 9 directly, and
a brake shoe main body portion 17 to which the brake pad portion 16
is fixed. Both of the brake pad portion 16 and the brake shoe main
body portion 17 are formed into a rectangular plate respectively,
layered, and united.
[0031] Slide faces 18, which receive side faces 6a and 7a of the
brake shoes 6 and 7 at four corner portions of the brake shoes 6
and 7 as to slide in a press-working direction of the brake shoes 6
and 7 (a horizontal direction in FIG. 3 and FIG. 5), are formed on
inner sides of the bracket 8. As described above, one pair of brake
shoes 6 and 7 are surrounded by the bracket 8, able to slide in the
press-working direction of the brake shoes 6 and 7, and held by the
bracket 8 not to move in a direction of the tangent force F.sub.t.
There is a merit that the brake shoes are stably held when the
brake shoes 6 and 7 of rectangular plate are held at the four
corner portions.
[0032] And, the brake shoe 7 of the pair of brake shoes 6 and 7 is
attached to a central part of the movable iron core 5 of the
electromagnet portion 1 through a centripetal coupling 19. The
other brake shoe 6 is attached to the plate body 2 side through an
adjusting screw 20 and a centripetal coupling 21.
[0033] Further, each one of a pair of return springs 22,
continuously pushing the brake shoe 6 and the brake shoe 7
elastically in a direction the brake shoes 6 and 7 part each other,
is disposed between the brake shoe 6 and the bracket 8, and the
brale shoe 7 and the bracket 8.
[0034] Concretely, the return spring 22 is made by punch press of a
piece of steel plate, and the configuration of the return spring 22
is approximately rectangular from which plural leg pieces protrude,
and having a short cylinder portion 23 on its center (refer to FIG.
6).
[0035] The centripetal coupling 19 or the centripetal coupling 21
is inserted to the short cylinder portion 23 as to slide. And, four
of the plural leg pieces described above are J-shaped holding leg
pieces 24 huggingly holding long sides of the rectangular brake
shoe main body portion 17, and two of the leg pieces are L-shaped
hitching leg pieces 25 and 26 hitching on short sides of the brake
shoe main body portion 17.
[0036] And, plate spring pieces 26 (four pieces in all), disposed
above and below the hitching leg pieces 25 (in FIG. 6), contact an
outer face of the bracket 8, push the brake shoes 6 and 7
respectively in directions shown with arrows A (in FIG. 5 and FIG.
8) as the brake shoes 6 and 7 mutually part from. For this,
concave-convex contact face (between a concave spherical face and a
convex spherical face) of the centripetal couplings 19 and 21, and
an end face of the adjusting screw 20 and the centripetal coupling
21 are kept not to generate small gaps, and noise generation is
effectively prevented thereby when the brake is switched on and
off.
[0037] Next, the above-mentioned plate body 2, etc. are further
concretely described with reference to Figures. The plate body 2 is
approximately rhombus as shown in FIG. 1, the adjusting screw 20 is
attached to a lower end apex of the plate body 2, the guiding rods
4 are disposed on a left apex and a right apex of the plate body 2
respectively, and a reinforcing rod 27 is disposed on an upper
apex. And, a lock nut 28 is screwed on the adjusting screw 20.
[0038] As shown in FIG. 5, the guiding rod 4 consists of a long
bolt 29 and a cylinder body 30. The long bolt 29 is screwed into a
tapped hole 31 of the fixed iron core 3, and both end portions of
the cylinder body 30 are respectively press-fitted to a counterbore
of the fixed iron core 3 and a counterbore of the plate body 2.
[0039] Each of the above-described guiding rods 4 is inserted to
each of holes 32 on both end part of the upper side of the
arch-shaped bracket 8 shown in FIG. 4, and an inner peripheral face
of the hole 32 and a peripheral face of the cylinder body 30 can
slide. And, in FIG. 5, slide movement becomes smooth for slide
bushings 33 inserted in the hole 32. As described above, the unit
U, composed of the electromagnet portion 1, the plate body 2, and
the guiding rods 4, is attached to the bracket 8 as to be able to
float for a micro dimension.
[0040] The reinforcing rod 27 prevents the plate body 2 from
falling down, which is caused for strong reaction force (in the
directions of the arrows A) when the brake shoes 6 and 7 press the
braked body 9, in a direction that interval between the upper apex
of the rhomboid plate body 2 and the electromagnet portion 1
decreases. In other words, a function of the reinforcing rod 27 is
a function as a strut.
[0041] A small protruding piece 34 is respectively formed on the
left apex and the right apex of the rhomboid plate body 2 in FIG.
1, and, on the other hand, a small protruding piece 35 similar to
the small protruding piece 34 is respectively formed on a left end
portion and a right end portion of the upper side of the bracket 8
in FIG. 4. A tapped hole 35a is formed on the small protruding
piece 35.
[0042] As described above, the unit U is attached to the bracket 8
as to be able to float for a micro dimension, namely, as to move
for a micro aperture B.sub.1 and a micro aperture B.sub.2 as shown
in FIG. 2, FIG. 3, and FIG. 5, and elastic members 36, which push
the plate body 2 as to part from the bracket 8 (in a rightward
direction in FIG. 2), are provided. in FIG. 2, the elastic member
36 consists of a pressed coil spring.
[0043] Further, regulating members 37, which regulate the plate
body 2 not to excessively move in the (above-described) parting
direction, are provided. In FIG. 2, the regulating member 37 is
composed of a bolt 38 screwed into the former-described tapped hole
35a and a nut 39 (for locking).
[0044] As described above, centering of the unit U is conducted
with the elastic members 36 and the regulating members 37, and air
gaps between the brake pad portions 16 of the brake shoes 6 and 7
and the braked body 9 (when not braked) can be regulated.
[0045] Especially, there is a merit that simplification of the
construction and cost reduction can be obtained when the elastic
member 36 and the regulating member 37 are compactly united by
insertion of the bolt 38 to the pressed coil spring as shown in
FIG. 2. And, although the unit U may incline to the heavy
electromagnet portion 1 side in a floating state and the brake pad
portions 16 may ununiformly contact (slide on) the braked body 9
such as a disc for the weight of the electromagnet portion 1 is
heavy in comparison with the weight of the plate body 2, the
above-described elastic members 36 ingeniously keep the balance of
the unit U by pushing the plate body 2 in the direction that the
plate body 2 parts from the fixed bracket 8.
[0046] According to the electromagnetic brake of the present
invention, the plate body 2 and the guiding rods 4 can be downsized
and lightweight for the tangent force F.sub.1 from the braked body
9 in braking is received through the braking force receiving
bracket 8 and not transmitted to the plate body 2 and the guiding
rods 4. And, a conventional large-volume caliper of block (refer to
the mark 61 in FIG. 9 and FIG. 10) can be omitted, and
simplification of the construction and compactification as a whole
can be obtained. Especially, horizontal dimension in FIG. 2 and
FIG. 3 can be reduced.
[0047] And, gaps of concave-convex contact face of the centripetal
coupling 21 and of the adjusting screw 20 are not generated, and
working noise of switching on and off of brake can be reduced. And
electromagnetic power of the electromagnet portion 1 can be fully
utilized for the minimized gaps. And, the centripetal couplings 19
and 21 can be thin and having a simple structure.
[0048] Further, centering of the unit U can be certainly conducted
with a simple construction of the brake. Especially, the brake pad
portions uniformly contact the braked body 9 because weight
unbalance that the electromagnet portion 1 is heavy to the plate
body 2 can be reduced with the elastic members 36, and the unit U
is centered on the braked body 9.
[0049] While preferred embodiments of the present invention have
been described in this specification, it is to be understood that
the invention is illustrative and not restrictive, because various
changes are possible within the spirit and indispensable
features.
* * * * *