CN109863306B

CN109863306B - Vane pump

Info

Publication number: CN109863306B
Application number: CN201780065393.6A
Authority: CN
Inventors: 赤塚浩一朗; 牧義之
Original assignee: KYB Corp
Current assignee: KYB Corp
Priority date: 2016-11-18
Filing date: 2017-11-08
Publication date: 2020-07-31
Anticipated expiration: 2037-11-08
Also published as: CN109863306A; DE112017005841T5; JP2018080687A; US20190301452A1; WO2018092645A1; JP6546895B2

Abstract

A vane pump (100) comprises: a pump rotor (31) having a through hole (31a) connected to the drive shaft (4); a pump housing (40) for housing the pump rotor (31) and the stator (33); and a 1 st side plate (36) disposed between the pump rotor (31) and the bottom surface (40b) of the pump housing (40), wherein the 1 st side plate (36) or the pump housing (40) has projections (50, 60), and the projections (50, 60) are inserted into the through-holes (31a) of the pump rotor (31).

Description

Vane pump

Technical Field

The present invention relates to a vane pump.

Background

An electric vane pump including an electric motor and a vane pump driven by the power of the electric motor is disclosed in japanese patent laid-open publication No. 2013-136965.

Disclosure of Invention

The electric vane pump disclosed in japanese patent laid-open publication No. 2013-136965 is sometimes manufactured by assembling an electric motor and a vane pump together after separately assembling the two. In this case, the shaft of the electric motor is inserted into the through hole of the rotor of the vane pump, whereby the electric motor and the vane pump are assembled.

However, since the rotor of the vane pump is in a state of being freely movable within the stator, the work of inserting the shaft of the electric motor into the through hole of the rotor of the vane pump is complicated. In particular, when the vane pump and the electric motor are assembled together in a state in which the diameter of the rotor is aligned in the vertical direction, the rotor drops into the bottom of the stator, and the center of the rotor and the center of the stator are largely displaced, so that the work of inserting the shaft of the electric motor into the through hole of the rotor of the vane pump is more complicated.

The invention aims to improve the assembly performance of a vane pump.

According to an aspect of the present invention, there is provided a vane pump, comprising: a rotor having a through hole connected to the drive shaft; a plurality of blades provided to be reciprocatingly movable in a radial direction with respect to the rotor; a stator that houses the rotor and in which tip end portions of the blades are in sliding contact with an inner peripheral surface of the stator as the rotor rotates; a housing for housing the rotor and the stator; and a side plate disposed between the rotor and a bottom surface of the housing, wherein a protrusion is formed on the side plate or the housing, and the protrusion is inserted into the through hole of the rotor.

Drawings

Fig. 1 is a sectional view of a vane pump according to embodiment 1 of the present invention.

Fig. 2 is a diagram showing a state before the electric motor and the vane pump are assembled together.

Fig. 3 is a sectional view of a vane pump according to a modification of embodiment 1 of the present invention.

Fig. 4 is a side view of the 1 st side plate.

Fig. 5 is a sectional view of a vane pump according to embodiment 2 of the present invention.

Detailed Description

Embodiments of the present invention will be described below with reference to the drawings.

< embodiment 1 >

A vane pump 100 according to embodiment 1 of the present invention is described with reference to fig. 1.

The vane pump 100 is used as a hydraulic pressure supply source for supplying hydraulic oil (working fluid) to a hydraulic device such as a continuously variable transmission mounted on a vehicle, for example.

The vane pump 100 is driven by the power of the electric motor 1. The vane pump 100 and the electric motor 1 are coaxially coupled by a drive shaft 4.

The electric motor 1 includes: a drive shaft 4 rotatably supported by the motor case 3 via

bearings

2a and 2 b; a motor rotor 5 having a plurality of permanent magnets arranged in a circumferential direction and fixed to the drive shaft 4; and a stator 6 fixed to an inner periphery of the motor case 3 and wound with a coil. The motor rotor 5 and the stator 6 are arranged concentrically, and a slight gap is formed between the two.

The motor case 3 includes: a main body 3a having a substantially bottomed tubular shape; and a motor cover 3b that closes the opening of the body portion 3a and is connected to the vane pump 100. The main body portion 3a and the motor cover 3b are integrally assembled by fitting an annular fitting portion 3c formed in the motor cover 3b to the inner peripheral surface of the main body portion 3 a.

The bearing 2a is fixed to the bottom of the body portion 3a, and the bearing 2b is fixed to the inner peripheral surface of the hollow portion 3d of the motor cover 3 b. The drive shaft 4 is rotatably supported by two

bearings

2a and 2b and extends through the hollow portion 3d of the motor cover 3 b. In this way, the drive shaft 4 is formed as a part of the electric motor 1, not as a part of the vane pump 100.

The vane pump 100 includes: a pump rotor 31 coupled to the drive shaft 4; a plurality of vanes 32 provided to be reciprocatingly movable in a radial direction with respect to the pump rotor 31; a stator 33 that houses the pump rotor 31 and in which the tip end portions of the vanes 32 slide in contact with the cam surface on the inner periphery of the stator 33 as the pump rotor 31 rotates; and a pump housing 40 for housing the pump rotor 31 and the stator 33.

The drive shaft 4 is supported only by the

bearings

2a and 2b provided in the electric motor 1, and the vane pump 100 is not provided with a bearing for supporting the drive shaft 4. An outer spline 4a is formed on the outer peripheral surface of the end of the drive shaft 4 on the vane pump 100 side.

The pump rotor 31 is an annular member, and a through hole 31a that penetrates in the axial direction and into which the drive shaft 4 is inserted is formed in the center portion thereof. An inner spline 31b (see fig. 2) for engaging with the outer spline 4a of the drive shaft 4 is formed on the inner peripheral surface of the through hole 31 a. Thus, the drive shaft 4 and the pump rotor 31 are coupled by spline coupling. In fig. 1, the illustration of the internal spline 31b is omitted.

Inside the stator 33, a plurality of pump chambers 34 are defined by the outer peripheral surface of the pump rotor 31, the cam surface of the stator 33, and the adjacent vanes 32.

The stator 33 is an annular member having a cam surface with a substantially elliptical shape having a short diameter and a long diameter. The cam surface of the stator 33 has two intake regions in which the volume of the pump chamber 34 expands with the rotation of the pump rotor 31, and two discharge regions in which the volume of the pump chamber 34 contracts with the rotation of the pump rotor 31.

The 1 st side plate 36 is disposed in contact with one side surface of the pump rotor 31 and the stator 33, and the 2 nd side plate 37 is disposed in contact with the other side surface of the pump rotor 31 and the stator 33. Thus, the 1 st side plate 36 and the 2 nd side plate 37 are arranged so as to sandwich the pump rotor 31 and the stator 33 from both sides, and define the pump chamber 34.

The 1 st side plate 36 is disposed between the pump rotor 31 and the bottom surface 40b of the pump housing 40. The 2 nd side plate 37 is disposed between the pump rotor 31 and the motor cover 3 b.

The pump rotor 31, the stator 33, the 1 st side plate 36, and the 2 nd side plate 37 are housed in a pump housing portion 40a formed in a concave shape in the pump case 40. The pump case 40 and the motor cover 3b are coupled by bolts, and the opening of the pump housing 40a is closed by the motor cover 3b of the motor case 3.

The 1 st side plate 36 is a disc-shaped member having two discharge ports 36a formed to penetrate in an arc shape. The discharge port 36a is opened corresponding to the discharge area of the stator 33, and discharges the working oil of the pump chamber 34.

The 1 st side plate 36 is integrally formed with the 1 st side plate 36 with a projection 50 inserted into the through hole 31a of the pump rotor 31. The projection 50 is projected from the center of the side surface of the first side plate 36, and is formed in a cylindrical shape concentric with the through hole 31a of the pump rotor 31. Gaps are formed between the outer peripheral surface 50a of the projection 50 and the inner peripheral surface of the through hole 31a, and between the tip end surface 50b of the projection 50 and the tip end surface 4b of the drive shaft 4. That is, the protrusion 50 does not contact the drive shaft 4 and the pump rotor 31 when the drive shaft 4 and the pump rotor 31 rotate. The function of the projection 50 will be described in detail later.

The 2 nd side plate 37 is an annular member, and a through hole 37a that penetrates in the axial direction and through which the drive shaft 4 penetrates is formed in the center portion thereof. Further, two suction ports (not shown) are formed in the outer periphery of the 2 nd side plate 37 so as to be cut out in an arc shape. The two suction ports are opened corresponding to the two suction areas of the stator 33 for guiding the working oil to the pump chamber 34. The 2 nd side plate 37 is not an essential structure of the vane pump 100 and can be discarded. In this case, the 1 st side plate 36 and the motor cover 3b sandwich the pump rotor 31 and the stator 33 from both sides to divide the pump chamber 34.

The relative rotation of the stator 33, the 1 st side plate 36, and the 2 nd side plate 37 is restricted by two positioning pins 46. Thereby, the positioning between the suction area of the stator 33 and the suction port of the 2 nd side plate 37 and the positioning between the discharge area of the stator 33 and the discharge port 36a of the 1 st side plate 36 are performed.

A positioning pin 46 penetrates the stator 33 and the 2 nd side plate 37, one end of the positioning pin 46 is inserted into the positioning hole 36d formed in the 1 st side plate 36, and the other end of the positioning pin 46 is inserted into the positioning hole 3e formed in the motor cover 3 b. In this way, the stator 33, the 1 st side plate 36, and the 2 nd side plate 37 are positioned with respect to the motor cover 3b by the positioning pins 46.

A seal member 45 is provided on the inner peripheral surface of the hollow portion 3d of the motor cover 3b to which the outer peripheral surface of the drive shaft 4 is slidably contacted. The seal member 45 prevents the working oil from leaking from the vane pump 100 to the electric motor 1.

A high-pressure chamber 42 communicating with the discharge port 36a of the 1 st side plate 36 is formed in an annular shape in the bottom surface 40b of the pump housing portion 40 a. The high-pressure chamber 42 is defined by the 1 st side plate 36 disposed on the bottom surface 40b of the pump housing portion 40 a. The high-pressure chamber 42 communicates with a discharge passage 41 formed to open to the outer surface of the pump housing 40.

The pump housing 40 is also provided with a suction passage (not shown) communicating with the suction port of the 2 nd side plate 37. The suction passage communicates with an oil tank that stores working oil.

When the drive shaft 4 is rotated by the electric motor 1, the pump rotor 31 coupled to the drive shaft 4 rotates, and accordingly, the pump chambers 34 in the stator 33 suck the working oil through the suction port of the 2 nd side plate 37 and discharge the working oil to the high pressure chamber 42 through the discharge port 36a of the 1 st side plate 36. The hydraulic oil in the high-pressure chamber 42 is supplied to the hydraulic equipment through the discharge passage 41. In this way, the pump chambers 34 in the stator 33 are supplied with and discharged with the working oil by expansion and contraction caused by the rotation of the pump rotor 31.

Next, a method of assembling the electric motor 1 and the vane pump 100 will be described.

The manufacturing is performed by assembling the electric motor 1 and the vane pump 100 together after assembling them separately. Fig. 2 is a diagram showing a state before the electric motor 1 and the vane pump 100 are assembled together. A case will be described in which the electric motor 1 and the vane pump 100 are assembled together in a state in which the orientation of the drive shaft 4 of the electric motor 1 is perpendicular to the vertical direction as shown in fig. 2.

The drive shaft 4 of the electric motor 1 is inserted into the through hole 31a of the pump rotor 31 of the vane pump 100, and the positioning pin 46 of the vane pump 100 is inserted into the positioning hole 3e of the motor cover 3b, and then the pump housing 40 and the motor cover 3b are fastened by a bolt, whereby the electric motor 1 and the vane pump 100 are assembled. The following description is made in detail.

First, the problem of assembly will be described before the method of assembly between the electric motor 1 and the vane pump 100 of the present embodiment is described.

Before the electric motor 1 and the vane pump 100 are assembled together, the pump rotor 31 of the vane pump 100 falls into the bottom of the stator 33 by gravity because it is not fixed and moves freely in the stator 33. In this case, the pump rotor 31 is relatively moved in the vertical direction with respect to the 2 nd side plate 37, and the position of the through hole 31a of the pump rotor 31 is shifted from the position of the through hole 37a of the 2 nd side plate 37. This causes a part of the through hole 37a of the 2 nd side plate 37 to be closed by the side surface of the pump rotor 31. In such a case, even if the drive shaft 4 is inserted into the through hole 31a of the pump rotor 31 through the through hole 37a of the 2 nd side plate 37, the distal end surface 4b of the drive shaft 4 interferes with the side surface of the pump rotor 31, and therefore, it is difficult to insert the drive shaft 4 into the through hole 31a of the pump rotor 31. Thus, the work of inserting the drive shaft 4 into the through hole 31a of the pump rotor 31 is troublesome. In particular, when the electric motor 1 and the vane pump 100 are assembled together in a state in which the diameter of the pump rotor 31 is oriented in the vertical direction, the position of the through hole 31a of the pump rotor 31 and the position of the through hole 37a of the 2 nd side plate 37 are largely displaced from each other, and therefore, the work of inserting the drive shaft 4 into the through hole 31a of the pump rotor 31 is complicated.

As a countermeasure, in the present embodiment, the projection 50 is formed on the 1 st side plate 36 of the vane pump 100, and the projection 50 is inserted into the through hole 31a of the pump rotor 31. Thus, in a state before the electric motor 1 and the vane pump 100 are assembled together, as shown in fig. 2, the inner circumferential surface of the through hole 31a of the pump rotor 31 contacts the outer circumferential surface 50a of the projection 50, and the projection 50 supports the pump rotor 31 to restrict the pump rotor 31 from dropping into the stator 33. Therefore, the through hole 31a of the pump rotor 31 and the through hole 37a of the 2 nd side plate 37 are slightly displaced from each other. Specifically, the position of the through hole 31a of the pump rotor 31 and the position of the through hole 37a of the 2 nd side plate 37 are shifted by an amount corresponding to the gap between the outer peripheral surface 50a of the projection 50 and the inner peripheral surface of the through hole 31a in the state where the electric motor 1 and the vane pump 100 are assembled together (the state shown in fig. 1).

When the drive shaft 4 is inserted into the through hole 31a of the pump rotor 31 through the through hole 37a of the 2 nd side plate 37 with the pump rotor 31 supported by the projection 50, the tapered surface 4c formed on the outer peripheral edge of the distal end surface 4b of the drive shaft 4 abuts against the inner peripheral edge 31c of the through hole 31a of the pump rotor 31, and the pump rotor 31 is lifted upward. Thereby, the external splines 4a of the drive shaft 4 enter the internal splines 31b, and the external splines 4a and the internal splines 31b are coupled.

In a state where the male spline 4a and the female spline 31b are coupled, that is, in a state where the drive shaft 4 and the pump rotor 31 are coupled, as shown in fig. 1, the projection 50 and the through hole 31a of the pump rotor 31 are concentrically arranged, and a gap is provided between an outer peripheral surface 50a of the projection 50 and an inner peripheral surface of the through hole 31 a. Further, a gap is also present between the tip end surface 50b of the projection 50 and the tip end surface 4b of the drive shaft 4. Therefore, when the drive shaft 4 and the pump rotor 31 rotate, the projection 50 does not interfere with the drive shaft 4 and the pump rotor 31.

As described above, the projection 50 has a function of positioning the pump rotor 31 within the stator 33 when the drive shaft 4 is inserted into the through hole 31a of the pump rotor 31, thereby facilitating insertion of the drive shaft 4 into the through hole 31 a.

According to embodiment 1 above, the following effects are exhibited.

Since the projection 50 inserted into the through hole 31a of the pump rotor 31 is formed in the 1 st side plate 36, when the drive shaft 4 is inserted into the through hole 31a of the pump rotor 31 when the electric motor 1 and the vane pump 100 are assembled together, the pump rotor 31 is positioned inside the stator 33 by the projection 50. This prevents the center of the pump rotor 31 and the center of the stator 33 from being largely displaced, and therefore, the assembling property of the vane pump 100 can be improved.

A modification of embodiment 1 will be described below.

(1) In the above embodiment, the embodiment in which the projection 50 is integrally formed with the 1 st side plate 36 has been described. Instead, the projection 50 may be formed separately from the 1 st side plate 36 as shown in fig. 3. Specifically, the columnar projection 50 may be press-fitted into the groove 36b formed in the side surface of the 1 st side plate 36.

In order to improve the sliding characteristics of the pump rotor 31, the side surface of the 1 st side plate 36 on which the pump rotor 31 slides needs to be polished. When the projection 50 is formed integrally with the 1 st side plate 36, it is difficult to perform the polishing work. However, when the projection 50 is formed separately from the 1 st side plate 36, the 1 st side plate 36 can be polished before the projection 50 is press-fitted into the groove 36b of the 1 st side plate 36, and thus the workability of the polishing work is improved.

(2) In the above embodiment, the projection 50 is projected from the center portion of the side surface of the first side plate 36 and formed in the cylindrical shape concentric with the through hole 31a of the pump rotor 31. Instead of the projections 50, a plurality of columnar projections 51 may be formed on the side surface of the 1 st side plate 36 as shown in fig. 4. Fig. 4 is a side view of the 1 st side plate 36 as viewed from the pump rotor 31 side. The protrusions 51 are provided in 3 numbers at intervals of 120 degrees on the same circle.

In a state where the drive shaft 4 and the pump rotor 31 are coupled, a gap is present between the outer peripheral surface of each projection 51 and the inner peripheral surface of the through hole 31a of the pump rotor 31. In a state before the electric motor 1 and the vane pump 100 are assembled together, the inner peripheral surface of the through hole 31a of the pump rotor 31 is brought into contact with the outer peripheral surface of any one of the protrusions 51, whereby the pump rotor 31 is supported by the protrusions 51.

When the mounting direction of the vane pump 100 is determined in advance, only 1 projection 51 may be provided on the vertical line.

(3) The drive shaft 4 is not limited to a type that rotates by the power of the electric motor 1. For example, the rotation may be performed by the power of the engine. That is, the vane pump 100 is not limited to the structure assembled to the electric motor 1.

< embodiment 2 >

A vane pump 200 according to embodiment 2 of the present invention is explained with reference to fig. 5. Hereinafter, description will be given mainly on differences from embodiment 1, and in the drawings, the same reference numerals are given to the components having the same functions as those of vane pump 100 of embodiment 1, and description thereof will be omitted. In fig. 5, illustration of the electric motor 1 is omitted.

In the vane pump 100 of embodiment 1 described above, the projection 50 inserted into the through hole 31a of the pump rotor 31 is formed on the 1 st side plate 36, whereas in the vane pump 200, the projection 60 inserted into the through hole 31a of the pump rotor 31 is formed on the pump housing 40. The following description is made in detail.

The projection 60 is formed integrally with the pump case 40 so as to project from the center of the bottom surface 40b of the pump case 40. In a state where the drive shaft 4 and the pump rotor 31 are coupled, the projection 60 is formed in a columnar shape concentric with the through hole 31a of the pump rotor 31 by penetrating the through hole 36c formed in the 1 st side plate 36. Gaps are formed between the outer peripheral surface 60a of the projection 60 and the inner peripheral surface of the through hole 31a, and between the distal end surface 60b of the projection 60 and the distal end surface 4b of the drive shaft 4. That is, the projection 60 does not contact the drive shaft 4 and the pump rotor 31 when the drive shaft 4 and the pump rotor 31 rotate.

The projection 60 may be formed separately from the pump case 40, and the projection 60 may be press-fitted into a groove formed in the bottom surface 40b of the pump case 40.

In order to prevent the working oil in the high-pressure chamber 42 from leaking through between the outer peripheral surface of the projection 60 and the through hole 36c of the 1 st side plate 36, a seal member 61 is provided between the bottom surface 40b of the pump housing 40 and the 1 st side plate 36 so as to surround the outer periphery of the projection 60.

The above embodiment 2 also has the same operational advantages as those of the above embodiment 1.

Hereinafter, the structure, operation and effects of the embodiments of the present invention will be described in summary.

The

vane pump

100, 200 includes: a pump rotor 31 having a through hole 31a connected to the drive shaft 4; a plurality of vanes 32 provided to be reciprocatingly movable in a radial direction with respect to the pump rotor 31; a stator 33 that houses the pump rotor 31 and in which the tip end portions of the vanes 32 slide in contact with the inner peripheral surface of the stator 33 as the pump rotor 31 rotates; a pump housing 40 for housing the pump rotor 31 and the stator 33; and a 1 st side plate 36 disposed between the pump rotor 31 and the bottom surface 40b of the pump housing 40, wherein the 1 st side plate 36 or the pump housing 40 has projections 50, 60, and the projections 50, 60 are inserted into the through-holes 31a of the pump rotor 31.

In this configuration, since the projections 50 and 60 to be inserted into the through hole 31a of the pump rotor 31 are formed on the 1 st side plate 36 or the pump housing 40, when the drive shaft 4 is inserted into the through hole 31a of the pump rotor 31, the pump rotor 31 is positioned within the stator 33 by the projections 50 and 60. This prevents the center of the pump rotor 31 and the center of the stator 33 from being largely displaced, and therefore, the assembling property of the vane pumps 100 and 200 can be improved.

Further, when the drive shaft 4 is inserted into the through hole 31a of the pump rotor 31, the protrusions 50, 60 position the pump rotor 31 within the stator 33.

The projection 50 is formed in a cylindrical shape concentric with the through hole 31a of the pump rotor 31, and gaps are formed between the outer peripheral surface 50a of the projection 50 and the inner peripheral surface of the through hole 31a, and between the distal end surface 50b of the projection 50 and the distal end surface 4a of the drive shaft 4.

In this configuration, the projection 50 does not interfere with the drive shaft 4 and the pump rotor 31 when the drive shaft 4 and the pump rotor 31 rotate.

The projection 50 is press-fitted into a groove 36b formed in the side surface of the 1 st side plate 36.

In this configuration, since the projection 50 is formed independently of the 1 st side plate 36, the 1 st side plate 36 can be polished before the projection 50 is press-fitted into the groove 36b of the 1 st side plate 36, and thus the workability of the polishing work is improved.

The projection 60 is provided to protrude from the bottom surface 40b of the pump case 40 and to penetrate through the through hole 36c formed in the 1 st side plate 36.

While the embodiments of the present invention have been described above, the above embodiments are merely examples of applications of the present invention, and the scope of the present invention is not limited to the specific configurations of the above embodiments.

This application claims priority based on Japanese application 2016-.

Claims

1. A vane pump in which, in a vane pump,

the vane pump includes:

a rotor having a through hole connected to the drive shaft;

a plurality of blades provided to be reciprocatingly movable in a radial direction with respect to the rotor;

a stator that houses the rotor and in which tip end portions of the blades are in sliding contact with an inner peripheral surface of the stator as the rotor rotates;

a housing for housing the rotor and the stator; and

a side plate disposed between the rotor and a bottom surface of the housing,

the protrusion inserted into the through hole of the rotor is press-fitted into a groove formed in a side surface of the side plate.

2. The vane pump of claim 1,

the protrusion positions the rotor within the stator when the driving shaft is inserted into the through hole of the rotor.

3. The vane pump of claim 1,

the protrusion is formed in a cylindrical shape concentric with the through hole of the rotor,

gaps are formed between the outer peripheral surface of the protrusion and the inner peripheral surface of the through hole, and between the tip end surface of the protrusion and the tip end surface of the drive shaft.