U.S. patent application number 14/348835 was filed with the patent office on 2014-08-28 for cooling circuit pump for a motor vehicle.
This patent application is currently assigned to ROBERT BOSCH GMBH. The applicant listed for this patent is Johann Braun, Samir Mahfoudh, Joerg Schmid. Invention is credited to Johann Braun, Samir Mahfoudh, Joerg Schmid.
Application Number | 20140241912 14/348835 |
Document ID | / |
Family ID | 46642505 |
Filed Date | 2014-08-28 |
United States Patent
Application |
20140241912 |
Kind Code |
A1 |
Braun; Johann ; et
al. |
August 28, 2014 |
COOLING CIRCUIT PUMP FOR A MOTOR VEHICLE
Abstract
The invention relates to a cooling circuit pump for a motor
vehicle, having a stator which is arranged in a motor housing (14)
and in which a rotatably mounted rotor is received. It is proposed
that the stator (12) is received in the motor housing (14) in a
positively locking manner.
Inventors: |
Braun; Johann; (Buehl,
DE) ; Schmid; Joerg; (Achern, DE) ; Mahfoudh;
Samir; (Buehl, DE) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
Braun; Johann
Schmid; Joerg
Mahfoudh; Samir |
Buehl
Achern
Buehl |
|
DE
DE
DE |
|
|
Assignee: |
ROBERT BOSCH GMBH
Stuttgart
DE
|
Family ID: |
46642505 |
Appl. No.: |
14/348835 |
Filed: |
August 2, 2012 |
PCT Filed: |
August 2, 2012 |
PCT NO: |
PCT/EP2012/065156 |
371 Date: |
March 31, 2014 |
Current U.S.
Class: |
417/363 |
Current CPC
Class: |
H02K 5/128 20130101;
H02K 1/185 20130101; F04D 29/60 20130101; F04D 29/628 20130101;
F04D 13/064 20130101 |
Class at
Publication: |
417/363 |
International
Class: |
F04D 29/60 20060101
F04D029/60 |
Foreign Application Data
Date |
Code |
Application Number |
Sep 30, 2011 |
DE |
10 2011 083 868.6 |
Claims
1. A cooling circuit pump for a motor vehicle, having a stator (12)
which is arranged in a motor housing (14) and in which a rotatably
mounted rotor is received, characterized in that the stator (12) is
received in the motor housing (14) in a positively locking
manner.
2. The cooling circuit pump according to claim 1, characterized in
that the stator (12) comprises a laminated core which is mounted by
means of a snap hook device (16, 30) in the motor housing (14).
3. The cooling circuit pump according to claim 2, characterized in
that snap hooks (16, 30) are disposed on an inside of the laminated
core radially around a circumference of the motor housing (14) in a
distributed manner, wherein latching lugs (20, 32) formed on an end
of the snap hooks (16, 30) engage around the laminated core in a
positively locking manner.
4. The cooling circuit pump according to claim 3, characterized in
that the snap hooks (16) are attached to a support ring (18).
5. The cooling circuit pump according to claim 4, characterized in
that a tolerance compensation element (22) is disposed between the
support ring (18) and the laminated core.
6. The cooling circuit pump according to claim 3, characterized in
that the snap hooks (16) are fastened to a rotor can (24) disposed
between the stator (12) and the rotor.
7. The cooling circuit pump according to claim 3, characterized in
that the laminated core of the stator (12) has a step or a ledge
(34) in an axial extension thereof, on which the latching lugs (32)
of the snap hooks (30) engage.
8. The cooling circuit pump according to claim 3, characterized in
that the snap hooks (16) are attached to a support ring (18) which
is manufactured as one piece together with said snap hooks (16) and
the motor housing (14).
Description
[0001] The invention relates to a cooling circuit pump for a motor
vehicle.
[0002] The German patent publication DE 10 2009 028 144 A1
discloses a cooling circuit pump for a motor vehicle, the former
having a hydraulic part as well as an electric motor. When such
water pumps are used in the automotive field, said pumps are
exposed to considerable vibration and temperature loads. This
results, for example, during use as a so-called auxiliary water
pump which increases the climate comfort in the motor vehicle,
improves the flow of the coolant and supports the heating circuit.
In so doing, the use of residual heat is facilitated when the
engine is turned off. It is known from the prior art how to fasten
the stator of the electric motor to the motor housing by means of
screw or adhesively bonded connections.
SUMMARY OF THE INVENTION
[0003] It is the aim of the present invention to mount the stator
of the electric motor such that said stator is sufficiently fixed
when inertia forces resulting from vibration loads occur and is
simultaneously able to compensate for the dimensional tolerances
caused by temperature.
[0004] In contrast to the solutions known to date, it is now
proposed according to the invention that the stator is received in
the motor housing in a positively locking manner. As a result,
complicated production equipment is no longer required as is the
case for bonding or screwing operations.
[0005] The stator which is constructed from a laminated core is
preferably fastened by means of a snap hook device on or in the
motor housing.
[0006] To this end, snap hooks are disposed on the inside of the
laminated core radially around the circumference of the motor
housing in a distributed manner, said snap hooks engaging around
the laminated core in a positively locking manner with the aid of
latching lugs formed on the ends thereof. The snap hooks are
thereby attached to a support ring, wherein support ring and snap
hooks are preferably configured as one piece with the motor
housing, e.g. manufactured by means of an injection molding
process.
[0007] A tolerance compensation element is disposed between support
ring and the laminated core of the stator, which element, as
previously mentioned, ensures that expansions due to temperature
can be absorbed. In addition, the tolerance compensation element
allows the stator to be easily mounted in the motor housing.
[0008] In a second advantageous embodiment, the snap hooks are
fastened to a rotor can.
[0009] A further modified embodiment consists of the laminated core
having a step or ledge on which the latching lugs of the snap hooks
engage.
BRIEF DESCRIPTION OF THE DRAWINGS
[0010] FIG. 1 shows a cross section through an electric motor of a
cooling circuit pump.
[0011] FIG. 2 shows a corresponding top view of the electric
motor.
[0012] FIG. 3 shows a cross section through an electric motor of a
cooling circuit pump in a second embodiment and
[0013] FIG. 4 shows a cross section through an electric motor of a
cooling circuit pump in a third embodiment.
DETAILED DESCRIPTION
[0014] In FIG. 1, an electric motor is depicted in cross section,
which preferably is used in cooling circuit pumps in the automotive
field. Design and function of such cooling circuit pumps are
generally known, for example from the German patent publication DE
10 2009 028 144 A1 cited at the beginning of the application. The
disclosure content of said patent publication will be explicitly
referred to if necessary.
[0015] Only the components of the cooling circuit pump are however
described below which are necessary to explain the invention. The
stator 12 comprising a laminated core is received in a motor
housing 14 of the electric motor 10. In order to mount the stator
12 in a positively locking manner, six snap hooks 16 are provided
which are uniformly distributed on the circumference of the motor
housing 14. The snap hooks 16 attach thereby in the region of a
support ring 18 which is preferably manufactured as one piece
together with the snap hooks 16 and the motor housing 14 in an
injection molding process. The snap hooks 16 have corresponding
latching lugs 20 on the free ends thereof, said latching lugs
engaging in a positively locking manner around the uppermost
lamella 13 of the laminated core in the installed state; thus
enabling the entire laminated core to be reliably fixed in the
motor housing 14. A tolerance compensation element 22 which is
correspondingly matched to the diameter of the lamellae or the
support ring 18 is disposed between support ring 18 and the
lowermost lamella 15 of the laminated core, said tolerance
compensation element being embodied as an elastomer ring or as a
metal corrugated washer.
[0016] Because the electric motor 10 has to be reliably sealed off
from the hydraulic part of the cooling circuit pump during
installation, a rotor can or pot 24 is introduced into the motor
housing 14 as depicted in FIG. 1 which is concentrically enclosed
by the stator 12 on the outside and the interior 26 of which
accommodates the rotor (not depicted) of the electric motor 10.
[0017] The assembly takes place by the mating of the stator 12 and
the engaging of the latching lugs 20 on the uppermost lamella 13 of
the laminated core after excessive pressure has been applied to the
elastic tolerance compensation element 22. In comparison to a
radial mounting of the stator, for example by means of screws or
adhesive bonding, the axial bracing of the rotor 12 achieved in the
process does not have to absorb any tolerances in the
circumferential direction.
[0018] In a second exemplary embodiment pursuant to FIG. 3 in which
identical components are provided with the identical reference
numerals, the snap hooks 16, in contrast to the first exemplary
embodiment, are configured on or fastened to a flange ring 28
formed from the pot 24.
[0019] In a third exemplary embodiment (see FIG. 4), in which
identical components are once again provided with identical
reference numerals, the length of the snap hooks 30 and thus the
required tolerance compensation is reduced in contrast to the first
and second exemplary embodiment. In this case, the laminated core
of the stator 12 is configured in a stepped manner in the axial
extension thereof, and the latching lugs 32 of the snap hooks 30
engage on a ledge 34 in the assembled state. The ledge 34 is
thereby formed by means of the selection of two different sheet
metal ring thicknesses.
[0020] The mounting of a stator described above is, of course, not
limited to the installation in a coolant pump but can be
universally used for electric motors in a variety of
applications.
* * * * *