CN218717297U

CN218717297U - Electric oil pump, oil pump motor and oil pump motor shell

Info

Publication number: CN218717297U
Application number: CN202221729125.4U
Authority: CN
Inventors: 陈金龙; 陈翼; 黄婧; 张伟荣
Original assignee: Taicang Boze Drive System Co ltd
Current assignee: Taicang Boze Drive System Co ltd
Priority date: 2022-07-06
Filing date: 2022-07-06
Publication date: 2023-03-24
Anticipated expiration: 2032-07-06

Abstract

The utility model relates to an electric oil pump, oil pump motor and oil pump motor casing. The oil pump motor housing is of hollow construction and has at least one of: a plurality of bead tabs disposed at circumferentially spaced intervals on an upper side; a flange rivet extending circumferentially on the lower side; and a spin rivet portion extending circumferentially between the upper side and the lower side. The oil pump motor includes the ECU fixed to the oil pump motor housing by the curled tab, and the oil pump motor housing described above. The electric oil pump comprises a pump support, a pump cover and the oil pump motor, the pump support is fixed on the motor shell of the oil pump through a rotary riveting part, and the pump cover is fixed on the motor shell of the oil pump through a riveting part. The utility model discloses can reduce the manufacturing cost of electric oil pump.

Description

Electric oil pump, oil pump motor and oil pump motor shell

Technical Field

The utility model relates to a vehicle motor field. In a first aspect, the present invention relates to an oil pump motor housing for a vehicle oil pump motor. In a second aspect, the present invention relates to an electric oil pump and an oil pump motor thereof.

Background

The electric oil pump generally includes an oil pump motor and an oil pump. Control is typically performed by an Electronic Control Unit (ECU) which is electrically connected via lead plates to components within the oil pump motor, such as the motor stator, to control the oil pump motor and, in turn, the operation of the oil pump.

Fig. 1A shows a related art electric oil pump, and fig. 1B shows a cross section of the electric oil pump. As shown, the electric oil pump 1 'includes an ECU 10', an oil pump motor housing 20', a pump bracket 30', a pump cover 40', and a socket 50' on the ECU. The ECU 10 'is fixed to the upper side of the oil pump motor housing 20' by screws 60', and the pump cover 40' is fixed to the lower side of the oil pump motor housing 20 'by screws 70'. The pump motor housing 20' defines a motor cavity for mounting pump motor components (not shown) such as a stator, rotor, and motor shaft. An oil pump member (not shown) such as a pump gear set is mounted on the pump bracket 30'.

In the conventional design, the pump motor housing 20 'and the pump bracket 30' are integrally formed by aluminum die casting. The pump cover 40' is also aluminum die cast.

The electric oil pump of the above design has the following disadvantages: the motor stator of the oil pump motor is made of magnetic steel materials and is different from the thermal expansion coefficient of an aluminum die-casting motor shell, so that elastic parts (such as elastic pins, elastic tolerance rings and the like) or glue is required to be additionally assembled between the two parts, and the acting force between the two parts is ensured to be large enough so that the motor stator is firmly installed in a motor cavity and cannot be loosened. Otherwise, there is a risk that the motor stator moves within the motor housing when the electric oil pump operates at a high temperature due to the different thermal expansion coefficient. This requires more parts and assembly processes, resulting in higher manufacturing costs.

Furthermore, screws are required for connecting the ECU and the pump cover with the motor housing. This in turn requires more parts and assembly processes, further resulting in higher manufacturing costs.

In addition, in order to align the pump bracket and the pump cover, 2 circular positioning pins are generally needed between the pump cover and the pump bracket to realize assembly centering, and the concentricity is ensured. This also results in higher manufacturing costs.

In recent years, the price of aluminum has been increasing, and the cost of manufacturing motor housings using aluminum materials has also been increasing.

It is desirable to reduce the manufacturing costs of the electric oil pump, the oil pump motor, and the motor housing thereof.

Disclosure of Invention

The object of the present invention is to overcome the above mentioned drawbacks in the prior art designs.

In a first aspect, the present invention provides an oil pump motor housing of hollow construction and having at least one of: a plurality of hemming tabs disposed at intervals along a circumference on an upper side; a flange rivet extending circumferentially on the lower side; and a spin rivet portion extending circumferentially between the upper side and the lower side. In this way, the oil pump motor housing can be manufactured by a deep drawing process using a material similar to the motor stator (e.g., steel), reducing the use of aluminum.

According to an embodiment, the hem tab projects from the upper side, being formed by a rectangular plate bent radially inwards. For example, four or more hem tabs are provided. In this way, the ECU of the oil pump motor can be fixed to the oil pump motor housing.

According to an embodiment, the rivet is bent radially inward, for example by pressing the underside of the pump motor housing from the outside (riveting process), causing it to plastically deform. Correspondingly, one end of the pump cover is provided with a beveling part so as to be matched with the riveting part. Thus, the pump cover can be fixed to the oil pump motor housing.

According to an embodiment, the clinching portion is configured as a radially inward groove, which is formed concavely, for example, by pressing the oil pump motor housing from the outside (clinching process) to be plastically deformed. Accordingly, the outer circumferential side surface of the pump holder is provided with a groove, and the concave groove is engaged in the groove of the pump holder. Thus, the pump bracket can be fixed to the pump motor housing.

In a second aspect, the present invention provides an oil pump motor, which includes an ECU fixed to an oil pump motor housing through a curled edge projected piece, and the above-mentioned oil pump motor housing.

The oil pump motor includes a motor stator. The motor stator is fixed in the oil pump motor shell through interference fit.

The utility model also provides an electric oil pump, it includes pump support, pump cover and foretell oil pump motor, and the pump support is fixed in oil pump motor casing through riveting portion soon, and the pump cover is fixed in oil pump motor casing through riveting portion. The riveting portion also ensures concentricity of the motor shell of the oil pump and the pump bracket.

According to an embodiment, an outer circumferential side surface of the pump bracket is provided with a groove that engages with a groove of the oil pump motor housing.

According to an embodiment, the pump cap has a chamfer at one end to facilitate mating with a rivet.

According to the embodiment, the concentricity is ensured by realizing the assembly centering between the pump cover and the pump bracket by 2 circular positioning pins, for example. Such a design is suitable for the requirements of a high-pressure electric oil pump.

According to another embodiment, the concentricity of the pump cover and the pump bracket is achieved by the rivet joint and the spin rivet joint of the oil pump motor housing. In addition, a groove and a boss are respectively arranged on the pump cover and the pump bracket. By fitting these two features to each other, a relative fitting angle of the pump cover and the pump bracket is achieved. Such a design is suitable for the requirements of a low-pressure electric oil pump.

The utility model discloses an oil pump motor casing is made through the metal deep-drawing. Thus, the oil pump motor housing may be fabricated from similar materials as the motor stator. The motor stator is directly pressed in and fixed on the motor shell of the oil pump through interference fit. Therefore, the motor stator can be firmly installed in the motor cavity without additional parts such as elastic pins and additional assembly processes in the prior art, and the motor stator cannot be loosened due to the fact that the thermal expansion coefficients of the materials of the motor stator and the oil pump motor shell are close. This reduces the manufacturing cost.

The utility model discloses a be connected between ECU, pump support and pump cover and the oil pump motor casing all need not the screw, reduces part quantity, and this further reduces manufacturing cost.

The utility model discloses a pump bracket and oil pump motor casing are the separable parts. The pump bracket and the pump cover can therefore be produced by aluminium injection molding, for example when used under high pressure, or by thermosetting plastics, such as thermosetting plastics or thermoplastics such as PPS, for example when used under low pressure. This further reduces the manufacturing costs.

Furthermore, the utility model discloses can reduce the use of aluminium, also reduce manufacturing cost.

Drawings

Some embodiments of the invention will be explained in more detail in the accompanying drawings, in which:

FIG. 1A is a schematic perspective view of a prior art oil pump motor;

FIG. 1B is a schematic cross-sectional view of the oil pump motor of FIG. 1A;

fig. 2 is a schematic perspective view of an oil pump motor housing according to an embodiment of the present invention;

fig. 3A is a schematic perspective view of an oil pump motor having an oil pump motor housing according to an embodiment of the present invention;

fig. 3B is a schematic sectional view of the oil pump motor of fig. 3A;

fig. 4 is a schematic view of alignment features of a pump cover and a pump bracket of an electric oil pump according to an embodiment of the present invention;

fig. 5 is an exploded perspective view of an oil pump motor according to an embodiment of the present invention; and

fig. 6 is an oil path schematic diagram of the oil pump motor according to the embodiment of the present invention.

In the figures, embodiments of the invention are shown in a simplified manner for the sake of clarity. Like reference numerals refer to like parts throughout the drawings.

The figures are not necessarily to scale.

List of reference numerals

1' electric oil pump

10’ECU

20' oil pump motor shell

30' pump support

40' pump cover

50' socket

60' screw

70' screw

1 electric oil pump

10ECU

20. Oil pump motor casing

21. Hemmed tab

22. Spin riveting part

23. Riveting part

24. Oil return hole

30. Pump support

31. Boss

32. Extension part

40. Pump cover

41. Groove

50. Socket

60. Pump gear set

70. Motor stator

80. Motor rotor

90. Motor shaft

F1 Direction of flow

F2 Direction of flow

S seal

Detailed Description

The electric oil pump, the oil pump motor, and the oil pump motor housing of the present invention will be described with reference to fig. 2 to 5. Although the embodiments are directed to an electric oil pump and an oil pump motor thereof, it will be understood by those skilled in the art that the present invention can be applied to other apparatuses including a motor.

In this context, for convenience of description, directional terms such as "upper" and "lower" are used, with reference to the orientation of the figures, which in practice may be different.

Fig. 2 shows an oil pump motor housing 20 which is of hollow construction and has 4 crimping tabs 21 provided at circumferentially spaced intervals on the upper side; a spin-riveting portion 22 extending circumferentially between the upper and lower sides; and a flange caulking portion 23 extending in the circumferential direction on the lower side. The oil pump motor housing is a deep drawn metal housing, for example steel.

As shown in fig. 2, the hemming tab 21 protrudes from the upper side and is formed by bending a rectangular plate radially inward. The rivet portion 22 is configured as a radially inward recess. The rivet 23 is bent radially inward.

Fig. 3A and 3B show a perspective view and a sectional view of the electric oil pump 1, respectively, showing in detail how the ECU 10, the pump bracket 30, and the pump cover 40, and the motor stator 70 are fixed to the oil pump motor housing 20. As shown in the drawing, the ECU 10 is fixed to the oil pump motor housing 20 by a crimping tab 21, and the outer circumferential side surface of the pump bracket 30 is provided with a groove, and the recessed groove of the rivet 22 is engaged in the groove of the pump bracket 30. One end of the pump cover 40 has a chamfered portion, which is fitted to the rivet 23, and the motor stator 70 is interference-fitted into the oil pump motor housing 20. Thus, the ECU, the pump bracket, the pump cover and the motor stator are respectively fixed on the motor shell of the oil pump.

Fig. 4 shows the alignment features of the pump cap and pump bracket. As shown, a boss 31 and a groove 41 are provided on the pump bracket 30 and the pump cover 40, respectively. The relative assembly angle of the pump bracket and the pump cover is restricted by the matching of the two characteristics. This is suitable for low pressure pumps. For high pressure pumps, conventional locating pins and holes are used to align the pump bracket and pump cover.

Fig. 5 shows an exploded perspective view of the electric oil pump 1. As shown, the electric oil pump 1 includes an ECU 10, a separate oil pump motor housing 20 defining a motor cavity for mounting oil pump motor components; a separate pump mount 30 for mounting an oil pump component; a pump cover 40; a socket 50 provided in the ECU, but the position thereof may be changed according to the user's needs; a pump gear set 60; a motor stator 70; a motor rotor 80; a motor shaft 90.

The ECU 10, the oil pump motor housing 20, the motor stator 70, the motor rotor 80, the motor shaft 90, and other oil pump motor components constitute an oil pump motor, which is mounted in a motor cavity.

The motor shaft 90 and the pump gear set 40 are drivingly connected, such as by a press fit.

The pump bracket 30 has a centrally disposed projection 32 that functions as a journal bearing, with the motor shaft 90 being inserted into the projection 32 and thereby journaled by the projection 32 of the pump bracket 30.

Fig. 6 shows the oil path of the electric oil pump installed in the user interface module. As the pump gear set 40 rotates, on the one hand, oil is sucked in from the gearbox in the flow direction F1 from the underside through the oil inlet of the pump cover 40 and pumped out through the oil outlet of the pump cover 40 to the consumer hydraulic module. On the other hand, after being sucked from the oil inlet of the pump cover, the oil is also sucked into the motor cavity through the oil inlet of the pump bracket to cool the oil pump motor parts, such as the motor rotor and the like, in the motor cavity, and then returns to the transmission case through the oil return hole 24 of the oil pump motor housing 20 in the flow direction F2.

A plurality of seals S are provided between the interface module and the electric oil pump 1 to prevent oil leakage.

In some cases, the features disclosed in the present invention may be used independently of other features. On the other hand, when necessary, the features disclosed in the present invention may be combined to provide various combinations.

The terms and expressions which have been employed in the present application are used as terms of description and not of limitation, and there is no intention, in the use of such terms and expressions, of excluding any equivalents of the features shown and described. Various modifications, variations and alternatives are possible within the scope of the claims. The claims are intended to cover all such equivalents.

Claims

1. An oil pump motor housing of hollow construction, characterized in that the oil pump motor housing has at least one of: a plurality of bead tabs disposed at circumferentially spaced intervals on an upper side; a flange rivet extending circumferentially on the lower side; and a spin rivet portion extending circumferentially between the upper side and the lower side.

2. The oil pump motor housing according to claim 1, wherein the bead tab protrudes from an upper side and is formed by bending a rectangular plate radially inward.

3. The oil pump motor housing according to claim 1 or 2, wherein the rivet is bent radially inward.

4. The oil pump motor housing according to claim 1 or 2, characterized in that the clinch portion is configured as a radially inward groove.

5. An oil pump motor characterized by comprising an ECU and the oil pump motor housing according to any one of claims 1 to 3, the ECU being fixed to the oil pump motor housing by a crimped tab.

6. The oil pump motor of claim 5, wherein the oil pump motor includes a motor stator that is secured within the oil pump motor housing by an interference fit.

7. An electric oil pump, which comprises a pump support and a pump cover, and is characterized in that the electric oil pump further comprises an oil pump motor according to claim 5 or 6, the pump support is fixed on a motor housing of the oil pump through a rivet joint, and the pump cover is fixed on the motor housing of the oil pump through a rivet joint.

8. The electric oil pump of claim 7, wherein an outer circumferential side surface of the pump bracket is provided with a groove that engages with a spin rivet portion configured as a radially inward groove.

9. The electric oil pump according to claim 7 or 8, characterized in that the pump cover has a chamfered portion at one end thereof, which is engaged with the rivet portion.

10. The electric oil pump according to claim 7 or 8, characterized in that a groove and a boss that are fitted to each other are provided on the pump cover and the pump bracket, respectively.