DEVICE FOR DRIVING A COMPRESSOR AND METHOD FOR ASSEMBLING OF THE DEVICE

Abstract

A device for driving a compressor of a gaseous fluid, in particular an electric motor. The device comprises a rotor and a stator which are disposed extending along a common longitudinal axis. A carrier element is disposed in contact on a first end side, oriented in an axial direction, of the stator, which carrier element comprises at least one resiliently deformable pressure element with a contact region. The pressure element is developed extending with an extent in the axial direction and, in a mounted state of the device, is in contact with the contact region on a mating surface under resilient deformation. A method for mounting and a use of the device is also provided.

Claims

1. A device for driving a compressor of a gaseous fluid, in particular an electric motor, comprising a rotor and a stator which are disposed extending along a common longitudinal axis, wherein a carrier element is disposed in contact on a first end side oriented in an axial direction of the stator, which carrier element comprises at least one resiliently deformable pressure element with a contact region, wherein the pressure element is developed extending with an extent (h) in the axial direction and, in a mounted state of the device is in contact with its contact region on a mating surface under resilient deformation.

2. A device according to claim 1, wherein the carrier element is implemented with a receiving element with connection passages for a connector housing with connector ports.

3. A device according to claim 2, wherein the pressure element and the receiving element are disposed on a common side, oriented in an axial direction, of the carrier element.

4. A device according to claim 2, wherein the carrier element, the pressure element and the receiving element are developed as a coherent unit as an integral component.

5. A device according to claim 1, wherein the pressure element is developed in the form of an arc and comprises a web.

6. A device according to claim 4, wherein the web is disposed oriented in the axial direction and the contact region is oriented in the radial direction.

7. A device according to claim 5, wherein the pressure element is connected with the carrier element across a front edge of the web.

8. A device according to claim 7, wherein the pressure element comprises the contact region at an end developed distally to the front edge of the web.

9. A device according to claim 1, wherein the carrier element comprises a radially oriented annular surface as well as an axially oriented annular surface, which are disposed adjoining one another at outer side edges and are connected with one another.

10. A device according to claim 9, wherein the pressure element is connected with the radially oriented annular surface of the carrier element.

11. A device according to claim 9, wherein the radially oriented annular surface of carrier element has the form of a circular ring.

12. A device according to claim 11, wherein the pressure element is disposed in a region of the radially oriented annular surface of the carrier element.

13. A device according to claim 9, wherein the axially oriented annular surface of the carrier element has the form of a cylinder.

14. A device according to claim 1, wherein at an implementation of the carrier element with a multiplicity of pressure elements the pressure elements are disposed on the carrier element distributed over the circumference.

15. A method for mounting the device for driving a compressor of a gaseous fluid according to claim 1, comprising the following steps: disposing a rotor and a stator on a common longitudinal axis (5), with the stator encompassing the rotor in the radial direction, disposing a carrier element on a first end side, oriented in an axial direction, of the stator, wherein a resilient pressure element is oriented extending with an extent (h) in the axial direction, as well as disposing the stator with the carrier element on a mating surface, wherein the pressure element with a contact region is in contact on the mating surface and is resiliently deformed such that between the carrier element and the mating surface a force (F), in particular a compressive force, is generated and the carrier element is pressed in the axial direction against the stator core of the stator and is stayed.

16. A method according to claim 15, wherein a connector housing is introduced into a receiving element developed on the carrier element and in this manner is fixed in position on the carrier element.

17. A method comprising driving a compressor with the device of claim 1 to compress a gaseous fluid, wherein the gaseous fluid is a refrigerant in a refrigerant circuit of a motor vehicle climate control system.

18. A device according to claim 2, wherein at an implementation of the carrier element with a multiplicity of pressure elements the pressure elements are disposed on the carrier element distributed over the circumference.

19. A device according to claim 3, wherein at an implementation of the carrier element with a multiplicity of pressure elements the pressure elements are disposed on the carrier element distributed over the circumference.

20. A device according to claim 4, wherein at an implementation of the carrier element with a multiplicity of pressure elements the pressure elements are disposed on the carrier element distributed over the circumference.

Description

BRIEF DESCRIPTION OF THE FIGURES

[0038] FIG. 1: a stator of an electric motor as a device for driving a compressor of a gaseous fluid, with a stator core, coils, an insulation element and a carrier element in a perspective view,

[0039] FIG. 2: the carrier element with a resilient pressure element in a perspective view,

[0040] FIG. 3: the stator of FIG. 1 in the mounted state and installed within a motor housing of the electric motor in lateral view.

DETAILED DESCRIPTION

[0041] In FIG. 1 is shown in a perspective view a stator 1 of an electric motor as a device for driving a compressor of a gaseous fluid, especially for a motor vehicle climate control system, for the conveyance of refrigerant through a refrigerant circuit. The stator 1 is developed with a stator core 2, coils 3, and insulation element 4 as well as with a carrier element 6.

[0042] The electric motor, for example a 3-phase alternating current motor, comprises a rotor, not shown, and the stator core 2 disposed in the radial direction on an outer side of the rotor and therewith disposed about the rotor. Both, the stator core 2, preferably developed as a laminated sheet package, and the insulation element 4, developed of an electrically insulating material, extend along a longitudinal axis 5, that also corresponds to the longitudinal axis of stator 1 and the rotational axis of the rotor, from a first end side to a second end side of stator 1. The insulation element 4 is advantageously developed as an extrusion coating of the stator core 2 and thus forms an integral component.

[0043] The coils 3 are developed of a wire wound about a region of the stator core 2 that extends inwardly in the radial direction. The regions, extending inwardly in the radial direction, of stator core 2 have the form of a web and are positioned with uniform distribution over the circumference of an outer wall of stator core 2. Between the wires of coils 3 and the particular regions of stator core 2 the insulation element 4 is disposed which insulates the stator core 2 and the wires of coils 3 with respect to one another. The insulation element 4 is developed at the ends, oriented inwardly and in the axial direction, of the webs so as to be expanded in the axial direction. The end segments projecting thusly of the insulation element 4 serve for fixing the wires, wound about the webs of stator core 2, of coils 3. The stator core 2, the insulation element 4 and the coils 3 form the stator unit of the electric motor.

[0044] The insulation element 4 projects at the end sides of stator 1 beyond the stator core 2. At the first end side of stator 1 a carrier element 6 is disposed with a receiving element 7 with connection passages 7a for a connector housing 7b with connector ports. The connector ports of the connector housing 7b serve as a component of an electrical connection between coils 3 of the electric motor and the inverter, for example with the aid of electrically conducting, pin-form connection elements which, passed through the connection passages 7a of the receiving element 7 of carrier element 6, are plugged into the connector ports of the connector housing 7b.

[0045] In the mounted state of stator 1, the carrier element 6 is in contact in the axial direction, on the one hand, on stator 1, in particular on stator core 2. The outer diameter of the carrier element 6 is herein less than the outer diameter of the stator core 2.

[0046] The carrier element 6, moreover, comprises, on the other hand, a resilient pressure element 8 that extends substantially in the axial direction. The pressure element 8 is consequently disposed on the side, facing away from the stator core 2, of the carrier element 6.

[0047] FIG. 2 shows in perspective view the carrier element 6 with the resilient pressure element 8 and the receiving element 7 with the connection passages 7a for the connector housing 7b with the connector ports. The pressure element 8 and the receiving element 7 are disposed on a common side oriented in the axial direction.

[0048] The carrier element 6 comprises a radially oriented circular ring-shaped annular surface 6a, in particular a sector of a circular ring-shaped annular surface as well as an axially oriented cylindrical annular surface 6b, which adjoin one another at outer side edges and are disposed in connection with one another. The receiving element 7 for the connector housing 7b is developed as a subregion of the radially oriented annular surface 6a.

[0049] The cylindrical wall of the axially oriented annular surface 6b of carrier element 6 is implemented with an outer diameter that is smaller than the outer diameter of the outer wall of stator core 2.

[0050] The resilient pressure element 8 is disposed in a region, in particular of an inner side edge, of the radially oriented circular ring-shaped annular surface 6a, and preferably has the form of an arc or a spring. The pressure element 8, as well as the receiving element 7 for the connector housing 7b, is developed as a constituent part of the carrier element 6. The carrier element 6 with the radial annular surface 6a, the axial annular surface 6b, the receiving element 7 with the connection passages 7a for the connector housing 7b with the connector ports and the pressure element 8 is implemented in particular as an integral injection molded element. The integral formation is realized within a molding process.

[0051] The pressure element 8 comprises a web 8a, oriented substantially in the axial direction, and a contact region 8b, oriented substantially in the radial direction. The pressure element 8 Is connected across a front edge of the web 8a with the radial annular surface 6a. At an end, developed distally to the front edge of the web 8a, the pressure element 8 comprises the contact region 8b which is advantageously developed as a contact area. In the mounted state of the electric motor the pressure element 8 is in contact with its contact region 8b on a housing, not shown, of the electric motor. When mounting the stator 1 with the carrier element 6 within the motor housing, which means specifically during the installation or the shrinking or pressing-in of the stator 1 into the motor housing and the pressure of the motor housing applied in the process onto the pressure element 8, in particular the web 8a of pressure element 8, is resiliently deformed.

[0052] FIG. 3 shows in lateral view the stator 1 of FIG. 1 in the mounted state installed within the motor housing of the electric motor. The resiliently deformed pressure element 8 extends with an extent h in the axial direction and with its contact region 8b is in contact on a mating surface 9, in particular on the motor housing of the electric motor. The pressure element 8 is deformed by a difference h.sub.0h.sub.1, where h.sub.0 describes the extension of the pressure element 8 in the starting state, or in the non-mounted state of stator 1, and h.sub.1 the extension of the pressure element 8 in the mounted state of stator 1 in the motor housing. Therewith applies h.sub.0>h.sub.1.

[0053] As a component of carrier element 6, the pressure element 8 has a rigidity defined and corresponding to the geometry and the mechanical dimensions of the carrier element 6. During the mounting of the stator 1 in the motor housing, between the carrier element 6 and the mating surface 9 as a closed end of the motor housing a force F, in particular a spring force, acting substantially in the axial direction, is built up and in this manner the carrier element 6, due to the resilient properties of the pressure element 8, is pressed in the direction of stator 1, in particular in the direction of the stator core 2. Herein, with the contact of pressure element 8 on the mating surface 9 of the motor housing and the resilient deformation particularly of the web 8a of pressure element 8, the force F acts onto the carrier element 6. Consequently, after the completion of the mounting of the electric motor, and thus after the completion of the insertion or pressing-in of stator 1 with the carrier element 6 into the motor housing, by means of the deformation of the pressure element 8 a prestress is generated which stays the carrier element 6 and prevents any movement of the carrier element 6 during the operation of the electric motor and therewith of the compressor. The carrier element 6 is herein secured in position specifically in the axial direction.

[0054] The pressure element 6 serves herein also for the complete elimination of vibrations of the carrier element 6 during operation of the compressor, independently of the particular operating conditions. The resulting force F is layed out such that all tolerance constellations are covered.

[0055] According to a, not shown, alternative implementation, the carrier element is developed with a multiplicity of pressure elements in any distribution over the circumference. By multiplicity is herein to be understood at least two pressure elements. The number and disposition of the pressure elements depends on the geometry of the electric motor, in particular of the carrier element.

LIST OF REFERENCE SYMBOLS

[0056] 1 Stator

[0057] 2 Stator core

[0058] 3 Coil

[0059] 4 Insulation element

[0060] 5 Longitudinal axis

[0061] 6 Carrier element

[0062] 6a Radial annular surface

[0063] 6b Axial annular surface

[0064] 7 Receiving element

[0065] 7a Connection passage

[0066] 7b Connector housing

[0067] 8 Pressure element

[0068] 8a Web

[0069] 8b Contact region

[0070] 9 Mating surface

[0071] h Extension pressure element 8 in the axial direction

[0072] h0 in the starting state

[0073] h1 in the mounted state

[0074] F effective direction F