CN212508802U

CN212508802U - Electric compressor

Info

Publication number: CN212508802U
Application number: CN202020984984.2U
Authority: CN
Inventors: 林芳和; 西堀圭; 岩佐真
Original assignee: Panasonic Intellectual Property Management Co Ltd
Current assignee: Panasonic Automotive Electronic Systems Co ltd
Priority date: 2019-09-13
Filing date: 2020-06-02
Publication date: 2021-02-09
Anticipated expiration: 2030-06-02
Also published as: JP2021042740A

Abstract

Provided is an electric compressor capable of reducing the number of manufacturing processes. An electric compressor (1) is provided with: a shaft member (30) connected to the motor (10); and a pin (35) that is press-fitted and fixed to the bottomed hole (32) and connected to the orbiting scroll (21), wherein the bottomed hole (32) is provided in an end surface (31) at one end of the shaft (30), the bottomed hole (32) is provided at a position offset from the rotation center of the shaft (30), a space (S1) is formed between the thinnest portion (30a) and the pin (35), and the thinnest portion (30a) is a portion having the thinnest thickness between the inner peripheral surface (32a) of the bottomed hole (32) and the outer peripheral surface of the shaft (30).

Description

Electric compressor

Technical Field

The utility model relates to an electric compressor.

Background

Patent document 1 discloses a scroll compressor. A crankshaft, which is a rotating shaft of the electric motor of the scroll compressor, is provided with a pin for rotating a scroll at a position offset from a rotation center of the crankshaft.

(Prior art document)

(patent document)

Patent document 1: Japanese patent laid-open publication No. 2019-78211

In the electric compressor of patent document 1, the pin may be provided to the crankshaft by press-fitting and fixing, and in this case, the electric compressor has a problem that the number of manufacturing processes is increased. Therefore, an electric compressor having a structure in which the number of manufacturing processes can be reduced is desired.

SUMMERY OF THE UTILITY MODEL

Accordingly, the present invention provides an electric compressor capable of reducing the number of manufacturing processes.

The electric compressor according to one aspect of the present invention includes: a shaft member connected with the motor; and a pin member press-fitted and fixed to a bottomed hole provided in an end surface of one end of the shaft member and connected to the orbiting scroll, wherein the bottomed hole is provided at a position deviated from a rotation center of the shaft member, and a space is formed between a thinnest portion, which is a portion having the thinnest thickness between an inner peripheral surface of the bottomed hole and an outer peripheral surface of the shaft member, and the pin member.

Alternatively, the press-in portion of the pin member pressed into the bottomed hole has a first portion that is a portion of a front end of the press-in portion and a second portion that is a portion different in position from the first portion in the axial direction of the shaft member, the first portion and the thinnest portion forming the space therebetween, the second portion being in contact with the thinnest portion.

Optionally, a first outer diameter of the shaft member is larger than a second outer diameter of the shaft member, the first outer diameter being an outer diameter of a first location corresponding to the first portion in the shaft direction, the second outer diameter being an outer diameter of a second location corresponding to the second portion in the shaft direction.

Optionally, the electric compressor further includes: a bearing fixed at the first position of the shaft member.

Optionally, the bottomed hole is a cylindrically shaped space, the pin member is cylindrically shaped, and is cut at the first portion, the cut portion of the pin member and the thinnest portion forming the space therebetween.

Alternatively, the bottomed hole has a groove extending in an axial direction of the shaft member, and the pin member has a projection of a shape corresponding to the groove.

Alternatively, the pin member has a groove extending in an axial direction of the shaft member, and the bottomed hole has a projection of a shape corresponding to the groove.

The utility model discloses an electric compressor can reduce manufacturing procedure.

Drawings

Fig. 1 is a sectional view showing a schematic configuration of an electric compressor 1 according to an embodiment.

Fig. 2 is an oblique view showing the outer shape of the assembly of the shaft member and the pin member.

Fig. 3 is an exploded oblique view of the shaft member and the pin member.

Section IV-IV in fig. 2 of fig. 4.

Fig. 5 is a plan view in the case where the shaft member is viewed from the end surface on the compression portion side in the axial direction of the shaft member.

Fig. 6 is an exploded perspective view of the shaft and the pin according to modification (2).

Fig. 7 is a plan view of the shaft member according to modification (2) as viewed from the end surface on the compression portion side in the axial direction of the shaft member.

Description of the symbols

1 electric compressor

10 electric motor

11 stator

12 rotor

20 compression part

21 revolving scroll

22 fixed scroll

30, 30A shaft

30a thinnest portion

31 end face

32, 32A has a bottom hole

32a, 32Aa inner peripheral surface

32Ab groove

33 first outer diameter portion

34 second outside diameter portion

35, 35A pin

35Aa projection

36 pressed part

37 exposed part

38 first part

39 second part

38a, 38Aa cut-out

40 frame body

51-53 bearing

54 casing tube

D1 first outside diameter

D2 second outside diameter

P1 first position

P2 second position

And (S1) space.

Detailed Description

(knowledge which becomes the basis of the present invention)

In the electric compressor of patent document 1, when the pin is provided to the crankshaft by press-fitting and fixing, the pin is press-fitted, and the outer shape of the crankshaft may expand outward. Since the crankshaft is rotatably supported by the bearing, it is difficult to insert into the bearing when the outer shape of the crankshaft expands. Therefore, in order to facilitate insertion of the crankshaft into the bearing after the pin is press-fitted, a step of adjusting the outer shape of the crankshaft by cutting or the like is required.

In order to solve the above problem, an electric compressor according to an aspect of the present invention includes: a shaft member connected with the motor; and a pin member press-fitted and fixed to a bottomed hole provided in an end surface of one end of the shaft member and connected to the orbiting scroll, wherein the bottomed hole is provided at a position deviated from a rotation center of the shaft member, and a space is formed between a thinnest portion, which is a portion having the thinnest thickness between an inner peripheral surface of the bottomed hole and an outer peripheral surface of the shaft member, and the pin member.

As described above, a space is formed between the thinnest portion of the shaft member and the pin member, and when the pin member is press-fitted into the bottomed hole of the shaft member, the thinnest portion can be suppressed from being pushed to the outside by the pin member. Therefore, the outer shape expansion of the shaft member can be suppressed. Therefore, the pin can be easily press-fitted into the fixed shaft and inserted into the bearing without performing cutting, and thus, the number of steps for adjusting the outer shape of the shaft, such as cutting, can be reduced.

The press-fit portion of the pin member pressed into the bottomed hole may have a first portion and a second portion, the first portion being a portion of a tip of the press-fit portion, the second portion being a portion different from the first portion in position in the axial direction of the shaft member, the first portion and the thinnest portion forming the space therebetween, and the second portion being in contact with the thinnest portion.

Since the second portion is in contact with the thinnest portion, the strength of press-fitting fixation can be easily set to a predetermined strength.

Further, a first outer diameter of the shaft member may be larger than a second outer diameter of the shaft member, the first outer diameter being an outer diameter of a first position corresponding to the first portion in the shaft direction, the second outer diameter being an outer diameter of a second position corresponding to the second portion in the shaft direction.

Since the second outer diameter is smaller than the first outer diameter, the outer diameter at the second position can be suppressed from being larger than the inner diameter of the bearing even if the thinnest portion is pushed outward by the second portion when the second portion is press-fitted into the bottomed hole. Therefore, the pin can be easily inserted into the bearing by being press-fitted into the fixed shaft.

The electric compressor may further include: a bearing fixed at the first position of the shaft member.

Further, the bottomed hole may be a space in a cylindrical shape, the pin member may be in a cylindrical shape, and the first portion may be cut out, the space being formed between the cut out portion of the pin member and the thinnest portion.

Therefore, the shape of the bottomed hole and the pin can be easily formed into a shape in which a space is formed between the bottomed hole and the pin.

Further, the bottomed hole may have a groove extending in an axial direction of the shaft member, and the pin member may have a projection having a shape corresponding to the groove.

Therefore, when the pin is press-fitted and fixed to the shaft, the pin can be prevented from rotating with respect to the shaft, and the cut portion can be easily arranged to face the thinnest portion.

Further, the pin member may have a groove extending in the axial direction of the shaft member, and the bottomed hole may have a projection having a shape corresponding to the groove.

Hereinafter, a motor-driven compressor according to an aspect of the present invention will be described in detail with reference to the accompanying drawings.

The embodiments described below are all specific examples of the present invention. The numerical values, shapes, materials, constituent elements, arrangement positions of constituent elements, connection forms, steps, and the order of steps shown in the following embodiments are merely examples, and the gist is not limited to the present invention. Among the components in the following embodiments, components that are not described in the technical means illustrating the highest concept will be described as arbitrary components.

(embodiment mode 1)

[1. constitution ]

The electric compressor 1 includes: the compressor includes a motor 10, a compression unit 20, a shaft 30 for transmitting power of the motor 10 to the compression unit 20, and a housing 40 for accommodating the motor 10, the compression unit 20, and the shaft 30 therein. The electric compressor 1 is mounted on a vehicle, for example, and is used in an air conditioning system of the vehicle.

The motor 10 drives the compression section 20. The motor 10 has a stator 11 and a rotor 12. The rotor 12 is formed of a plurality of stacked disk-shaped magnetic bodies, and the centers of the disks are penetrated by the shaft 30 and fixed by the shaft 30. The stator 11 is configured by a plurality of coils arranged in an annular shape so as to surround the rotor 12 when viewed from the axial direction of the shaft 30. The stator 11 is fixed to the inner wall of the frame 40. The stator 11 generates a magnetic field by supplying electric power from a circuit board not shown, and applies a magnetic action to the rotor 12. Thus, the stator 11 rotates the rotor 12.

The compression unit 20 is, for example, a scroll-type compression unit. The compression section 20 includes: a revolving scroll 21 revolving by the motor 10 via a shaft 30, and a fixed scroll 22 fixed to the frame 40. The orbiting scroll 21 and the fixed scroll 22 each have a wall portion arranged in a spiral shape to mesh with each other.

The orbiting scroll 21 and the pin 35 are connected to each other so as to be rotatable with respect to the pin 35, and the pin 35 is disposed at a position eccentric to the shaft 30. Specifically, the orbiting scroll 21 and the pin 35 of the shaft 30 are connected to each other through the bearing 53 and the sleeve 54. With this configuration, the orbiting scroll 21 relatively orbits with respect to the fixed scroll 22 so as not to rotate by the rotation of the motor 10 and the rotation of the shaft member 30. Accordingly, the volume of the space (compression chamber) surrounded by the wall of the orbiting scroll 21 and the wall of the fixed scroll 22 is reduced, and the refrigerant in the compression chamber is compressed. In this way, the compression portion 20 compresses the sucked refrigerant and discharges the compressed refrigerant.

The shaft 30 is connected to the motor 10 and is supported rotatably with respect to the housing 40. Specifically, the shaft 30 is supported by a portion on the opposite side of the compression unit 20 with respect to the motor 10 so as to be rotatable with respect to the housing 40 via a bearing 51, and is supported by a portion on the compression unit 20 side with respect to the motor 10 so as to be rotatable with respect to the housing 40 via a bearing 52. The

bearings

51, 52 support the shaft member 30 with the same rotational axis.

The housing 40 houses the motor 10, the compression unit 20, and the shaft 30, sucks the refrigerant from the suction port 41 disposed on the motor 10 side, and discharges the refrigerant compressed by the compression unit 20 from the discharge port 42 disposed on the compression unit 20 side.

Next, a specific configuration of the shaft 30 and the pin 35 will be described with reference to fig. 2.

Fig. 2 is an oblique view showing the outer shape of the assembly of the shaft member and the pin member. Fig. 3 is an exploded oblique view of the shaft member and the pin member. Section IV-IV in fig. 2 of fig. 4. Fig. 5 is a plan view of the shaft member when viewed from the end surface on the compression portion side along the shaft direction AX1 of the shaft member.

The shaft 30 has a bottomed hole 32 in an end surface 31 of the shaft 30 on the compression portion 20 side. The bottomed hole 32 is a space, for example, in a cylindrical shape, and is provided at a position deviated from the rotation center of the shaft member 30. Specifically, the cylindrical shaft having the bottomed hole 32 extends in a direction parallel to the rotation axis of the shaft 30, and is disposed at a position spaced apart from the rotation axis of the shaft 30.

Further, the shaft member 30 has a first outer diameter portion 33 and a second outer diameter portion 34, the first outer diameter portion 33 having a first outer diameter D1, the second outer diameter portion having a second outer diameter D2. The first outer diameter portion 33 is located at a first position P1 in the axial direction AX1 of the shaft member 30. The second outer diameter portion 34 is located at a second position different from the first position P1 in the axial direction AX 1. The second outer diameter portion 34 is a portion having the end surface 31 of the shaft 30, and the first outer diameter portion 33 is a portion disposed adjacent to the opposite side of the end surface 31 of the second outer diameter portion 34. The first outer diameter D1 is larger than the second outer diameter D2. The bearing 52 is press-fitted and fixed to the first outer diameter portion 33 of the shaft member 30. In other words, the inner diameter of the bearing 52 is smaller than the first outer diameter D1 and larger than the second outer diameter D2.

Therefore, when the shaft member 30 is press-fitted and fixed to the bearing 52, the bearing 52 is easily fitted over the second outer diameter portion 34 of the shaft member 30. So that the orientation of the bearing 52 is limited to the axis of the bearing 52 coinciding with the axis of the shaft element 30 because of the second outer diameter portion 34. Since the bearing 52 can be moved to the first outer diameter portion 33 in a state where the orientation is restricted, the first outer diameter portion 33 of the shaft 30 can be easily press-fitted into the bearing 52.

The pin 35 is a member that is press-fitted and fixed to the bottomed hole 32 and connected to the orbiting scroll 21. The pin member 35 has: press-fitted into press-fitted portion 36 of bottomed hole 32 and exposed portion 37 exposed from bottomed hole 32. The press-fit portion 36 has: the first portion 38 at the tip of the press-fit portion 36 and the second portion 39 at a position different from the first portion 38 in the axial direction AX1 of the shaft member 30.

The first portion 38 has a cutout portion 38a in which a part of a side surface of a cylindrical shape is cut out in the entire axial direction AX2 of the pin 35. The surface of the cutout portion 38a is, for example, a plane parallel to the axial direction AX2 of the pin 35. Since the first portion 38 has the cutout portion 38a, the cutout portion 38a does not contact the inner peripheral surface 32a of the bottomed hole 32. Further, the first portion 38 is disposed at a position opposite to the first outer diameter portion 33 of the shaft member 30. The first portion 38 may also be configured such that a portion thereof opposes the second outer diameter portion 34 of the shaft 30.

The pin 35 is press-fitted into the bottomed hole 32 so that the cutout portion 38a faces the thinnest portion 30a, and the thinnest portion 30a is a portion having the thinnest thickness between the inner peripheral surface 32a of the bottomed hole 32 and the outer peripheral surface of the shaft 30. A space S1 is thus formed between the thinnest portion 30a and the cutout portion 38 a. In other words, the thinnest portion 30a and the cutaway portion 38a are not contiguous at spaced locations.

The second portion 39 is a portion of the pressed portion 36 other than the first portion 38, and has a cylindrical shape. In this way, the second portion 39 is not cut away unlike the first portion 38, and therefore the entire periphery thereof is in contact with the inner peripheral surface 32a of the bottomed hole 32. In other words, the second portion 39 meets the thinnest portion 30 a. Further, the second portion 39 is disposed only at a position opposed to the second outer diameter portion 34 of the shaft member 30. In other words, the second portion 39 is disposed at a position not opposed to the first outer diameter portion 33 of the shaft member 30.

The exposed portion 37 has substantially the same cylindrical shape as the second portion 39, is formed integrally with the second portion 39, and is continuous.

[2. effects, etc. ]

In the motor-driven compressor 1 according to the present embodiment, the space S1 is formed between the thinnest portion 30a of the shaft 30 and the pin 35, and when the pin 35 is press-fitted and fixed to the bottomed hole 32 of the shaft 30, the thinnest portion 30a can be prevented from being pushed outward by the pin 35. Therefore, the outer shape expansion of the shaft 30 can be suppressed. Therefore, even if the cutting work is not performed, the pin member 35 can be easily press-fitted into the fixed shaft member 30 and inserted into the bearing 52, so that the cutting work can be reduced.

In the electric compressor 1 according to the present embodiment, the press-fitting portion 36 of the pin 35, which is press-fitted into the bottomed hole 32, includes the first portion 38 and the second portion 39. The first portion 38 is a portion pressed into the front end of the portion 36. The second portion 39 is a portion that is different in position from the first portion 38 in the axial direction AX1 of the shaft member 30. A space S1 is formed between the first portion 38 and the thinnest portion 30 a. The second portion 39 meets the thinnest portion 30 a. Therefore, the strength of press-fitting fixation can be easily set to a predetermined strength.

In the electric compressor 1 according to the present embodiment, the first outer diameter D1 of the shaft 30 at the first position corresponding to the first portion 38 in the axial direction AX1 of the shaft 30 is larger than the second outer diameter D2 of the shaft 30 at the second position corresponding to the second portion 39 in the axial direction AX1 of the shaft 30.

As described above, since the second outer diameter D2 is smaller than the first outer diameter D1, when the second portion 39 is press-fitted into the bottomed hole 32, the outer diameter of the second outer diameter portion 34 can be suppressed from being larger than the inner diameter of the bearing 52 even if the thinnest portion 30a is pushed outward by the second portion 39. Therefore, the pin member 35 can be easily inserted into the bearing 52 by being press-fitted into the fixed shaft member 30.

In the electric compressor 1 according to the present embodiment, the bottomed hole 32 is a cylindrical space. The pin 35 is cylindrical in shape and is cut away at the first portion 38. A space S1 is formed between the cutout 38a and the thinnest part 30a, and the cutout 38a is a cut-out part of the pin member 35. Therefore, the shape of the bottomed hole 32 and the pin 35 can be easily set to a shape in which the space S1 is formed between the bottomed hole 32 and the pin 35.

[3. modification ]

(1)

In the electric compressor 1 according to the above-described embodiment, the pin 35 is cut only in a part of the first portion 38, but the pin is not limited to this and may be cut in the entire pin in the axial direction AX 2. Even in this case, since a space can be formed between the thinnest portion 30a of the shaft 30 and the pin, the same effect as that of the electric compressor 1 of embodiment 1 can be obtained.

In the case of a pin having a structure in which the entire pin is cut off in the axial direction AX2, a shaft having a first outer diameter at the first position P1 and a second outer diameter at the second position P2 may be used. This is because the pin is cut out entirely in the axial direction AX2 of the pin, and the thinnest part 30a forms a space with the pin at any position, and therefore, when the pin is press-fitted and fixed to the bottomed hole 32 of the shaft, the pin can be prevented from pushing the thinnest part to the outside. The pin may not be cut out in the entire axial direction AX2, but may be cut out in the entire axial direction AX2 of the press-fitting portion press-fitted into the bottomed hole 32.

(2)

Next, a modification (2) will be described with reference to fig. 6 and 7.

Fig. 6 is an exploded perspective view of the shaft and the pin according to modification (2). Fig. 7 is a plan view of the shaft member according to modification (2) as viewed from the end surface on the compression portion side in the axial direction of the shaft member.

In modification (2), the bottomed hole 32A of the shaft 30A has a groove 32Ab extending in the axial direction AX1 of the shaft 30A. The groove 32Ab is formed at a position opposite to the thinnest portion 30a on the opposite side of the thinnest portion 30a of the inner peripheral surface 32Aa of the bottomed hole 32A, and is formed over the entire depth of the bottomed hole 32A.

The pin member 35A has: a cutout portion 38Aa cut out in the entire pin 35A in the axial direction AX2, and a protrusion portion 35Aa having a shape corresponding to the groove 32Ab, the protrusion portion 35Aa extending in a protruding strip shape in the entire pin 35A in the axial direction AX2 on the opposite side of the cutout portion 38 Aa.

The groove 32Ab may not be formed in the entire bottomed hole 32A, but may be formed from the end surface 31 of the shaft 30A to a length shorter than the depth of the bottomed hole 32A. In this case, the projection 35Aa formed in the pin 35A needs not to be formed in the pin 35A from the tip of the pin 35A to the length of the portion of the bottomed hole 32A where the groove 32Ab is not formed, so that the pin 35A can be inserted into the portion of the bottomed hole 32A where the groove 32Ab is not formed.

Even if the groove 32Ab is formed along the entire depth of the bottomed hole 32A, the protrusion 35Aa of the pin 35A may not be formed entirely or partially in the axial direction AX2 of the pin 35A.

The cutout portion 38Aa of the pin 35A is cut out as a whole in the axial direction AX2 of the pin 35A, but is not limited to this, and may be cut out in the same shape as the cutout portion 38a formed in the pin 35 of the embodiment.

The groove 32Ab is formed at a position on the opposite side of the inner peripheral surface 32Aa of the bottomed hole 32A from the thinnest portion 30a, but is not limited to this, and may be formed at a position different from the thinnest portion 30a on the inner peripheral surface 32Aa of the bottomed hole 32A. Similarly, the protrusion 35Aa of the pin 35A may be formed at a position different from the notch 38Aa, instead of at a position opposite to the notch 38Aa, and may be formed at a position where the notch 38Aa is fitted into the groove 32Ab when facing the thinnest part 30 a.

In the structure of the shaft 30A and the pin 35A described with reference to fig. 6 and 7, the bottomed hole 32A and the projection 35Aa are fitted to each other. Therefore, when the pin 35A is press-fitted and fixed to the shaft 30A, the pin 35A can be suppressed from rotating with respect to the shaft 30A, and the cutout portion 38Aa can be easily arranged to face the thinnest portion 30A.

(3)

In modification (2), the groove 32Ab is formed in the bottomed hole 32A of the shaft 30A, and the protrusion 35Aa having a shape corresponding to the groove 32Ab is formed in the pin 35A, but on the contrary, a groove extending in the axial direction may be formed in the pin, and a protrusion having a shape corresponding to the groove of the pin may be formed in the bottomed hole of the shaft. Even in this case, the same effect as in modification (2) can be obtained.

(4)

In the above embodiment, the bottomed hole 32 has a cylindrical shape, but may not have a cylindrical shape, and may have a square-pillar shape as long as it is a columnar space. In this case, the pressed-in portion in the pin member may be a shape corresponding to the shape of the bottomed hole, and the exposed portion may be a cylindrical shape.

As described above, the electric compressor according to one aspect of the present invention is explained according to the embodiment, but the present invention is not limited to this embodiment. Various modifications devised by those skilled in the art are implemented in the present embodiment or in a form in which the constituent elements of different embodiments are combined and constructed without departing from the spirit of the present invention, and are also included in one or more aspects of the present invention.

The present invention is useful as an electric compressor or the like capable of reducing the number of manufacturing processes.

Claims

1. An electric compressor is characterized by comprising:

a shaft member connected with the motor; and

a pin member press-fitted and fixed to a bottomed hole provided at an end surface of one end of the shaft member and connected to the orbiting scroll,

the bottomed hole being provided at a position deviated from a rotation center of the shaft member,

a space is formed between the thinnest portion, which is the portion having the thinnest thickness between the inner peripheral surface of the bottomed hole and the outer peripheral surface of the shaft member, and the pin member.

2. The motor-driven compressor according to claim 1,

a press-in portion of the pin member pressed into the bottomed hole has a first portion that is a portion of a leading end of the press-in portion and a second portion that is a portion different in position from the first portion in an axial direction of the shaft member,

the first portion and the thinnest portion forming the space therebetween,

the second portion is contiguous with the thinnest portion.

3. The motor-driven compressor according to claim 2,

a first outer diameter of the shaft member is larger than a second outer diameter of the shaft member, the first outer diameter being an outer diameter of a first position corresponding to the first portion in the shaft direction, the second outer diameter being an outer diameter of a second position corresponding to the second portion in the shaft direction.

4. The motor-driven compressor according to claim 3,

the electric compressor further includes:

a bearing fixed at the first position of the shaft member.

5. Motor compressor according to any one of claims 2 to 4,

the bottomed hole is a space of a cylindrical shape,

the pin member is cylindrical in shape and is cut away at the first portion,

the space is formed between the cut-away portion and the thinnest portion of the pin member.

6. Motor compressor according to any one of claims 2 to 4,

the bottomed hole has a groove extending in an axial direction of the shaft member,

the pin member has a protrusion having a shape corresponding to the groove.

7. Motor compressor according to any one of claims 2 to 4,

the pin member has a groove extending in an axial direction of the shaft member,

the bottomed hole has a protrusion portion having a shape corresponding to the groove.