WO2019230454A1

WO2019230454A1 - Compressor, and method for fixing adjusting screw member

Info

Publication number: WO2019230454A1
Application number: PCT/JP2019/019750
Authority: WO
Inventors: 謙治齊藤
Original assignee: サンデン・オートモーティブコンポーネント株式会社
Priority date: 2018-05-31
Filing date: 2019-05-17
Publication date: 2019-12-05
Also published as: JP2019210823A

Abstract

[Problem] To suppress loosening of an adjusting screw member more efficiently. [Solution] A clamp portion 67, which is formed by deforming a crest of a female thread section 62 radially inward, is formed at a rear end surface 66 of a cylinder block.

Description

Compressor, adjusting screw member fixing method

The present invention relates to a method for fixing a compressor and an adjusting screw member.

As shown in Patent Document 1, in a swash plate type compressor, a minute clearance is set between the drive shaft and the support plate in the axial direction, and an adjustment screw member for adjusting the clearance is a cylinder block. It is fixed to. Specifically, the adjustment screw member is prevented from loosening by fitting the male screw portion of the adjustment screw member to the female screw portion of the cylinder block and partially crushing both screw threads.

JP 2008-106679 A

To adjust the clearance, first, the adjustment screw member is advanced with respect to the drive shaft, the adjustment screw member is retracted by a predetermined amount from the position where the support plate is in contact with the drive shaft, and then crimping is performed. Since there is a minute gap in the axial direction between the female screw part and the male screw part, when an axial load is received from the drive shaft, the adjustment screw member is axially moved by the axial gap between the female screw part and the male screw part. Will be pushed. Since the caulking is mainly effective against the load in the circumferential direction, it may come off when receiving the load in the axial direction, and the adjustment screw member may be loosened.
An object of the present invention is to more effectively suppress loosening of the adjusting screw member.

A compressor according to an aspect of the present invention is provided.
A drive shaft rotatably supported;
A cylinder block disposed on the other end side of the drive shaft and having an internal thread formed on an inner peripheral surface thereof penetrating along the axial direction of the drive shaft;
An adjustment screw member at a position where a male screw portion formed on the outer peripheral surface fits into the female screw portion and one end is retracted by a predetermined amount from a position where it abuts the other end of the drive shaft,
A first caulking portion is formed on the other end surface of the cylinder block by deforming the thread of the internal thread portion inward in the radial direction.

The method of fixing the adjusting screw member according to one aspect of the present invention includes:
Supports rotation during driving,
A cylinder block in which a female thread portion is formed on the inner peripheral surface penetrating along the axial direction of the drive shaft is disposed on the other end side of the drive shaft,
The external thread formed on the outer peripheral surface of the adjustment screw member is fitted to the internal thread of the cylinder block,
An adjustment step of advancing the adjustment screw member with respect to the drive shaft and retreating the adjustment screw member by a predetermined amount from a position where one end of the adjustment screw member is in contact with the other end of the drive shaft;
Forming a first caulking portion in which the thread of the female screw portion is deformed radially inward on the other end surface of the cylinder block.

According to the present invention, since the screw thread of the female screw part is deformed radially inward by the first caulking part, it closely fits with the screw thread of the male screw part and reduces a minute gap in the axial direction. be able to. Therefore, not only the circumferential load but also the axial load can be received, and the loosening of the adjusting screw member can be more effectively suppressed.

It is sectional drawing along the axial direction in a compressor. It is sectional drawing to which the fixing location of the adjustment screw member was expanded. It is the perspective view which expanded the fixing location of the adjustment screw member. It is sectional drawing which expanded the screwing part of an internal thread part and an external thread part (before processing). It is sectional drawing which expanded the screwing part of an internal thread part and an external thread part (after a process). It is a figure which shows arrangement | positioning of a crimping part. It is a figure explaining the caulking process which crushes the site | part where a screw thread overlaps to an axial direction. It is a figure which shows a modification.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. Each drawing is schematic and may differ from an actual one. Further, the following embodiments exemplify apparatuses and methods for embodying the technical idea of the present invention, and the configurations are not specified as follows. That is, the technical idea of the present invention can be variously modified within the technical scope described in the claims.

<< One Embodiment >>
"Constitution"
FIG. 1 is a cross-sectional view along the axial direction of the compressor.
The compressor 11 is a belt drive type, swing plate type, variable capacity compressor used in a refrigerant circuit of a car air conditioner, for example, and introduces a refrigerant, compresses it, and then discharges it.
The compressor 11 is integrated with a front housing 12, a center housing 13, and a rear housing 14 arranged in order from the front side along the axial direction so as to maintain airtightness.

The center housing 13 is formed in a cylindrical shape on the front side in the axial direction, and a cylindrical cylinder block 21 is formed on the rear side in the axial direction. A plurality of cylinder bores 22 penetrating along the axial direction are formed in the cylinder block 21. The cylinder bores 22 are provided at equal intervals around the central axis of the cylinder block 21. The center housing 13 has a crank chamber 23 formed in a cylindrical shape. A valve plate 24 is sandwiched between the cylinder block 21 and the rear housing 14. A suction chamber 25 and a discharge chamber 26 are formed inside the rear housing 14. The suction chamber 25 is disposed on the radially outer side, and the discharge chamber 26 is disposed on the radially inner side. A refrigerant is introduced into the suction chamber 25 from an inlet (not shown). The discharge chamber 26 discharges the refrigerant from a discharge port (not shown).

The drive shaft 27 is accommodated in the center housing 13. The drive shaft 27 has a front side rotatably supported by the front housing 12 and a rear side rotatably supported by the cylinder block 21. A front end side of the drive shaft 27 protrudes from the front housing 12 and is connected to a pulley 29 via an electromagnetic clutch 28. The electromagnetic clutch 28 is opened by de-energization and is engaged by excitation. For example, engine power is transmitted to the pulley 29 via a drive belt. Therefore, when the electromagnetic clutch 28 is engaged with the engine being driven, the drive shaft 27 is driven at a predetermined pulley ratio.

In the crank chamber 23, a disk-shaped rotor 31 is fastened to the front end side of the drive shaft 27. The rotor 31 is supported by the front housing 12 so as to be rotatable in the thrust direction. A swash plate 33 is connected to the rotor 31 via a link mechanism 32. The swash plate 33 is formed in an annular shape and is inserted through the drive shaft 27. The link mechanism 32 makes the inclination angle of the swash plate 33 with respect to the drive shaft 27 variable.
A swing plate 35 is supported on the swash plate 33 via a bearing 34 so as to be relatively rotatable. The rocking plate 35 is formed in an annular shape and is inserted through the drive shaft 27, and is prevented from rotating by the rotation blocking mechanism 36, so that only rocking is allowed. That is, when the drive shaft 27 rotates, the rotational motion of the swash plate 33 is converted into the swing motion of the swing plate 35.

The rotation prevention mechanism 36 includes an inner ring 41, an outer ring 42, a ball 43, and a sleeve 44.
The inner ring 41 is formed in a cylindrical shape, the drive shaft 27 is fitted on the inner circumference, and the rear side in the axial direction of the outer circumference is fitted in the recess 45 of the cylinder block 21. The inner ring 41 is slidable in the axial direction with respect to the drive shaft 27 and is capable of relative rotation. The rear side in the axial direction of the outer periphery of the inner ring 41 and the recess 45 of the cylinder block 21 have, for example, a substantially triangular shape that fit with each other when viewed from the axial direction. Therefore, the inner ring 41 is slidable in the axial direction with respect to the cylinder block 21, and relative rotation is prevented.

The outer ring 42 is formed in an annular shape, and the inner periphery thereof is fitted to the front side in the axial direction of the outer periphery of the inner ring 41 via the ball 43, and the outer periphery is supported by the swing plate 35.
Each ball 43 is sandwiched and held by a guide groove 46 formed in the inner ring 41 and a guide groove 47 formed in the outer ring 42. The guide groove 46 of the inner ring 41 and the guide groove 47 of the outer ring 42 are arranged with a gap in the circumferential direction, and the respective axes intersect with each other when viewed from the circumferential direction, and hold the ball 43 at the intersection. .
The sleeve 44 is formed in a cylindrical shape, the inner periphery is fitted into the drive shaft 27, and the outer periphery formed in a spherical shape is a part of the front side in the axial direction of the inner periphery of the inner ring 41 and the outer ring 42. It fits part of the inner circumference.

Even if the swash plate 33 rotates, the rotation of the inner ring 41 is prevented, so that the swing plate 35 is also prevented from rotating via the ball 43 and the outer ring 42. The outer ring 42 is fitted to the inner ring 41 via the ball 43, and the swing of the outer ring 42 along the outer peripheral surface of the sleeve 44 is allowed by the rolling of the ball 43, which becomes the swing of the swing plate 35. . The swinging of the swinging plate 35 means that the phase closest to the cylinder block 21 and the phase farthest from the cylinder block 21 are displaced in the circumferential direction in a state where the rotation is blocked. The center of curvature of the outer peripheral surface formed in the spherical shape of the sleeve 44 is the swing center of the swing plate 35.
Pistons 51 are fitted to the cylinder bores 22 so as to be able to advance and retreat, and the pistons 51 are connected to the swing plate 35 via connecting rods 52. Thereby, the swinging motion of the swinging plate 35 is converted into the reciprocating motion of each piston 51. Both ends of the connecting rod 52 are ball joints.

The cylinder bore 22, the piston 51, and the valve plate 24 constitute a compression chamber 53. The valve plate 24 is formed with a suction hole 54 that communicates with the suction chamber 25 and a discharge hole 55 that communicates with the discharge chamber 26. The suction hole 54 is provided with a suction valve 56 that is a reed valve on the compression chamber 53 side, and the discharge hole 55 is provided with a discharge valve 57 that is a reed valve on the discharge chamber 26 side. The suction valve 56 is formed with a discharge opening 58 that communicates with the discharge hole 55 of the valve plate 24.
When there is no pressure difference between the suction chamber 25 and the compression chamber 53, the suction valve 56 is closed, the pressure of the compression chamber 53 is relatively small with respect to the suction chamber 25, and the pressure difference is equal to or greater than a predetermined value. The intake valve 56 opens. When there is no pressure difference between the discharge chamber 26 and the compression chamber 53, the discharge valve 57 is closed, the pressure of the compression chamber 53 is relatively large with respect to the discharge chamber 26, and the pressure difference is not less than a predetermined value. The discharge valve 57 opens.

In the process in which the piston 51 is displaced forward in the axial direction, the compression chamber 53 becomes negative pressure, and the suction valve 56 is opened, whereby the refrigerant is sucked into the compression chamber 53 from the suction chamber 25. Then, in the process in which the piston 51 is displaced rearward in the axial direction, the compression chamber 53 changes from negative pressure to positive pressure, and the suction valve 56 is closed, whereby the refrigerant in the compression chamber 53 is compressed. When the piston 51 comes closest to the valve plate 24, the compression chamber 53 becomes high pressure, and the discharge valve 57 is opened, whereby the refrigerant is discharged from the compression chamber 53 to the discharge chamber 26. Then, the discharge valve 57 is closed in the process in which the piston 51 is displaced forward again in the axial direction. Thus, the reciprocating motion of the piston 51 causes the refrigerant to be sucked, compressed, and discharged.

A substantially annular adjusting screw member 61 is fixed to the cylinder block 21.
FIG. 2 is an enlarged cross-sectional view of a fixing portion of the adjustment screw member.
FIG. 3 is an enlarged perspective view of a fixing portion of the adjustment screw member.
On the rear side of the cylinder block 21, a female thread portion 62 is formed on an inner peripheral surface that penetrates along the axial direction of the drive shaft 27 (FIG. 2). A male screw portion 63 is formed on the outer peripheral surface of the adjustment screw member 61, and the male screw portion 63 is fitted to the female screw portion 62 (screwing). The adjustment screw member 61 is disposed on the rear side of the drive shaft 27, and an annular support plate 64 made of a thin plate is provided on the front side of the adjustment screw member 61. The adjustment screw member 61 has a hexagonal through hole 65 as viewed in the axial direction (FIG. 3), and the advance / retreat position is adjusted by inserting a predetermined tool into the through hole 65 and rotating it.

The screw position of the adjustment screw member 61 is adjusted so that the front end of the support plate 64 is separated from the rear end of the drive shaft 27 by a minute gap d1. Due to the pressure difference between the crank chamber 23 and the compression chamber 53, the drive shaft 27 is displaced in the axial direction when the compressor 11 is driven and when the drive is stopped. When the compressor 11 is driven, the drive shaft 27 is displaced to the front side in the axial direction, and when the drive of the compressor 11 is stopped, the drive shaft 27 is displaced to the rear side in the axial direction. The support plate 64 stops driving the compressor 11 and abuts against the rear end of the drive shaft 27 when the drive shaft 27 is displaced rearward in the axial direction, thereby restricting the position in the axial direction. FIG. 2 shows a state in which the compressor 11 is driven and the drive shaft 27 is displaced forward in the axial direction.

In order to fix the adjustment screw member 61 to the cylinder block 21, a caulking portion 67 (first caulking portion) is formed on the rear end surface 66 of the cylinder block 21 by deforming the thread of the female screw portion 62 inward in the radial direction. ) Is formed. The caulking portion 67 is formed longer in the circumferential direction than in the radial direction (FIG. 3), has a substantially crescent shape when viewed from the axial direction, and is disposed so that the outer side of the arc faces the axial center side of the cylinder block 21. .
Next, the procedure for caulking will be described.
First, the adjustment screw member 61 is moved forward with respect to the drive shaft 27, and is moved backward by the gap d1 from the position where the front end of the support plate 64 is in contact with the rear end of the drive shaft 27 (adjustment step).
Next, a caulking process is performed on the rear end surface 66 of the cylinder block 21 in order to deform the thread of the female thread portion 62 inward in the radial direction (machining process).

FIG. 4 is an enlarged cross-sectional view of a threaded portion between the female screw portion and the male screw portion (before processing).
In the caulking process, the caulking blade 71 is hit in the axial direction against the rear end surface 66 of the cylinder block 21. The caulking blade 71 extends in the axial direction, and the cross section on the distal end side is inclined from the inner side to the outer side in the radial direction toward the front side in the axial direction. The caulking process is performed at a position where the inner side in the radial direction of the caulking blade 71 is more outward in the radial direction than the diameter of the valley in the female screw portion 62. Between the female screw part 62 and the male screw part 63, there is a minute gap d2, that is, backlash, in the axial direction.

FIG. 5 is an enlarged cross-sectional view of the threaded portion between the female screw portion and the male screw portion (after processing).
By hitting a caulking blade 71 on the rear end surface 66 of the cylinder block 21, a caulking portion 67 is formed by deforming the thread of the female thread portion 62 inward in the radial direction. Depending on the depth at which the caulking blade 71 is driven, the number of steps for deforming the thread of the female thread portion 62 differs. As an example, here, only the first stage thread from the rear side in the axial direction is deformed inward in the radial direction. Since the screw thread in the first stage from the rear side in the axial direction of the female screw part 62 closely fits with the screw thread of the male screw part 63, a minute gap d2 in the axial direction is reduced.

FIG. 6 is a diagram showing the arrangement of the crimping portion.
As an example, the case where the three crimping parts 67 are formed is shown here.
(A) in the figure shows a jig 72 used for caulking. The jig 72 has a substantially disk shape, and three crimping blades 71 are formed at equal intervals (120 degree intervals) along the circumferential direction.
(B) in a figure shows the rear-end surface 66 of the cylinder block 21 after a process. By reducing the jig 72 in the axial direction relative to the cylinder block 21, three crimping portions 67 are formed at equal intervals along the circumferential direction around the adjustment screw member 61.

<Action>
Next, main effects of the embodiment will be described.
It is necessary to provide a minute gap d1 between the drive shaft 27 and the support plate 64. If the gap d1 is too large, the drive shaft 27 is moved in the axial direction when the compressor 11 is stopped from the drive state. The hitting sound increases when it is displaced rearward and comes into contact with the support plate 64. Therefore, the allowable range of the required gap d1 is very small, and measures have been taken to prevent the adjustment screw member 61 from loosening. For example, the caulking process which crushes the site | part where the thread of the internal thread part 62 and the thread of the external thread part 63 overlap can be considered.

FIG. 7 is a diagram illustrating caulking processing for crushing a portion where the screw threads overlap in the axial direction.
Here, on the rear end surface 66 of the cylinder block 21, the caulking blade 73 is hit in the axial direction against a portion where the screw thread of the female screw part 62 and the screw thread of the male screw part 63 overlap. The caulking blade 73 extends in the axial direction, and the tip is pointed in a conical shape. The caulking process is performed at a position where the tip of the caulking blade 73 overlaps the effective diameter of the male screw portion 63. When such a caulking process is performed, the screw thread of the first step is mainly crushed from the rear side in the axial direction of the male screw portion 63, and the gap d2 between the female screw portion 62 and the male screw portion 63 is not reduced. Therefore, when an axial load is received from the drive shaft 27, the adjustment screw member 61 is pushed in the axial direction by the axial gap d2 between the female screw portion 62 and the male screw portion 63. Since this caulking process is mainly effective with respect to the load in the circumferential direction, it may come off when it receives an axial load, and the adjustment screw member 61 may be loosened.

Therefore, in the present embodiment, a caulking portion 67 is formed on the rear end surface 66 of the cylinder block by deforming the thread of the female screw portion 62 inward in the radial direction. Specifically, the caulking portion 67 is formed on the outer side in the radial direction with respect to the diameter of the valley in the female screw portion 62. Thereby, since the screw thread of the axial direction rear side in the internal thread part 62 fits closely with the thread of the external thread part 63, the micro clearance gap d2 of an axial direction is reduced. Therefore, not only the circumferential load but also the axial load can be received, and the fastening force is improved, so that loosening of the adjusting screw member 61 can be more effectively suppressed.
Further, compared to the case where the caulking process is performed on the part where the screw threads overlap, the adjustment screw member 61 is changed by a simple fixing method called caulking process while maintaining the existing adjustment structure because only the part and tool to be processed are changed. Can be prevented.

Further, since the crimping process is performed only on the cylinder block 21, the impact on the adjustment screw member 61 during the crimping process can be suppressed. Therefore, the positional accuracy of the adjustment screw member 61 is improved.
Further, the caulking portion 67 has a shape that is longer in the circumferential direction than in the radial direction. Thereby, the distance of the circumferential direction which closely fits the thread of the internal thread part 62 with the thread of the external thread part 63 can be lengthened. Therefore, loosening of the adjusting screw member 61 can be more effectively suppressed.
Further, the caulking portion 67 is formed at a plurality of locations along the circumferential direction. Thereby, the location where the thread of the internal thread part 62 fits closely with the thread of the external thread part 63 can be increased. Therefore, loosening of the adjusting screw member 61 can be more effectively suppressed.

<Modification>
In the embodiment, only the caulking portion 67 in which the thread of the female screw portion 62 is deformed inward in the radial direction is formed, but the present invention is not limited to this. In addition to the caulking part 67, a caulking process for crushing the part where the screw thread of the female screw part 62 and the screw thread of the male screw part 63 overlap in the axial direction may be added.
FIG. 8 is a diagram showing a modification.
(A) in the figure shows a jig 72 used for caulking. The jig 72 has a substantially disk shape, and three crimping blades 71 and three crimping blades 73 are formed alternately at equal intervals (60-degree intervals) along the circumferential direction.

(B) in a figure shows the rear-end surface 66 of the cylinder block 21 after a process. By reducing the jig 72 in the axial direction with respect to the cylinder block 21, the three crimping portions 67 and the three crimping portions 74 (second crimping portions) are arranged in the circumferential direction around the adjustment screw member 61. Formed at regular intervals.
By adding the caulking portion 74 in addition to the caulking portion 67, the fastening force can be improved without improving the fitting accuracy between the female screw portion 62 and the male screw portion 63. The caulking portion 67 is mainly effective for axial loads, and the caulking portion 74 is mainly effective for circumferential loads.

In the embodiment, the belt drive type, the swing plate type, and the variable capacity compressor 11 have been described as an example. However, the present invention is not limited to this. In addition, it can be applied to a method of fixing the adjusting screw member in an arbitrary compressor such as an electric type, a swash plate type, and a fixed capacity.
Although the present invention has been described with reference to a limited number of embodiments, the scope of rights is not limited thereto, and modifications of the embodiments based on the above disclosure are obvious to those skilled in the art.

DESCRIPTION OF SYMBOLS 11 ... Compressor, 12 ... Front housing, 13 ... Center housing, 14 ... Rear housing, 21 ... Cylinder block, 22 ... Cylinder bore, 23 ... Crank chamber, 24 ... Valve plate, 25 ... Suction chamber, 26 ... Discharge chamber, 27 DESCRIPTION OF SYMBOLS ... Drive shaft, 28 ... Electromagnetic clutch, 29 ... Pulley, 31 ... Rotor, 32 ... Link mechanism, 33 ... Swash plate, 34 ... Bearing, 35 ... Swing plate, 36 ... Rotation prevention mechanism, 41 ... Inner ring, 42 ... Outer ring , 43 ... Ball, 44 ... Sleeve, 45 ... Recess, 46 ... Guide groove, 47 ... Guide groove, 51 ... Piston, 52 ... Connecting rod, 53 ... Compression chamber, 54 ... Suction hole, 55 ... Discharge hole, 56 ... Suction Valve, 57 ... Discharge valve, 58 ... Discharge opening, 61 ... Adjustment screw member, 62 ... Female screw part, 63 ... Male screw part, 64 ... Support plate, 65 ... Through hole, 66 ... Rear end surface, 7 ... caulking part, 71 ... crimping blade, 72 ... jig, 73 ... crimping blade, 74 ... crimping portion

Claims

A drive shaft rotatably supported;
A cylinder block disposed on the other end side of the drive shaft and having an internal thread formed on an inner peripheral surface thereof penetrating along the axial direction of the drive shaft;
An adjustment screw member in which a male screw portion formed on an outer peripheral surface fits into the female screw portion, and one end thereof is retracted by a predetermined amount from a position in contact with the other end of the drive shaft,
The compressor is characterized in that a first caulking portion is formed on the other end surface of the cylinder block by deforming a thread of the female screw portion inward in the radial direction.
The compressor according to claim 1, wherein the first caulking portion is formed on an outer side in a radial direction with respect to a diameter of a valley in the female screw portion.
The compressor according to claim 1 or 2, wherein the first caulking portion is longer in the circumferential direction than in the radial direction.
The compressor according to any one of claims 1 to 3, wherein the first caulking portion is formed at a plurality of locations along a circumferential direction.
A second caulking portion crushed in the axial direction is formed at a portion where the thread of the female screw portion and the screw thread of the male screw portion overlap when viewed from the other end side in the axial direction. The compressor according to any one of claims 1 to 4.
The drive shaft is supported rotatably,
A cylinder block having a female thread portion formed on the inner peripheral surface thereof penetrating along the axial direction of the drive shaft is disposed on the other end side of the drive shaft,
A male screw portion formed on the outer peripheral surface of the adjustment screw member is fitted to the female screw portion of the cylinder block,
An adjustment step of advancing the adjustment screw member with respect to the drive shaft, and retracting a predetermined amount from a position where one end of the adjustment screw member is in contact with the other end of the drive shaft;
And a machining step of forming a first caulking portion in which the thread of the female screw portion is deformed radially inward on the other end surface of the cylinder block.