JP2586588B2 - Method and apparatus for assembling oscillating plate type variable displacement compressor - Google Patents

Description

Description: BACKGROUND OF THE INVENTION The present invention relates to a method and an apparatus for assembling a gas compressor, which is particularly suitable for vehicle air conditioning, and more particularly, from a housing forming a crank chamber to a cylinder block. Method and apparatus for assembling an oscillating plate type variable displacement compressor configured to receive via a thrust trace an elastic body adjusted by a displaceable race retainer at a rear end of a drive shaft extending therein. About.

[Prior Art] In an oscillating plate type flammable capacity compressor, a compression reaction force of a piston and a crank chamber pressure acting on a back surface of a piston cause a thrust load on a rotating body and a drive shaft via an oscillating plate connected to a piston. Use as Therefore, in order to receive such a thrust load, a thrust bearing is sandwiched between an inner end wall surface of the housing which is combined with the cylinder block to form a crank chamber, and an end surface of the rotating body. An elastic body biases between a bottom wall surface of a counterbore hole, which is bored from the front end surface of the block and has a bottom to support an extending drive shaft via a radial bearing, and the drive shaft rear end. Thrust traces are installed.
No. 75 gazette).

[Problems to be Solved by the Invention] However, since the components constituting the above-described compressor vary within allowable limits of manufacturing or assembly dimensions, it is necessary to keep the piston top clearance within the required range. Adjustments are required. Generally, such adjustments are made by converting the thrust bearing race to one of different thickness, but based on such adjustments, the drive shaft sometimes moves about 1 mm in the axial direction. However, despite the movement of the drive shaft, the bottom wall surface of the facing counterbore hole of the rear end surface of the drive shaft is immovably formed, so that the interval between these opposed surfaces necessarily fluctuates. . That is, if the distance is too large, a gap is formed between the thrust trace and the rear end of the drive shaft to cause backlash, and if the distance is too narrow, sliding between the thrust trace and the rear end of the drive shaft is caused. The surface pressure exceeds the allowable limit and seizure occurs.

And such a problem is that a counterbore hole including a screw hole having a depth such that the rear end of the drive shaft is exposed from the rear end face of the cylinder block is formed, and a thrust trace engaged with the counterbore hole is inserted and fitted. This can be eliminated by adopting a displaceable receiving means in which the race holder for pressing the thrust trace to the rear end of the drive shaft via the elastic body is screwed into the screw hole.

By the way, in order that the elastic body pre-pressed by adjusting the tightening of the race holder always keep the required urging force even after assembly, it is necessary to perform a crimping process so that the race holder does not screw from the adjustment position. is there. However, when the race clamp tightened with the specified torque is simply crimped as it is, the race clamp receiving the crimping load is displaced within the range of the screw backlash against the urging force of the elastic body. In addition, there is a problem that the biasing force of the elastic body whose angle has been adjusted is deviated.

The present invention is a technique to solve the problem of creating an assembling method and an apparatus that can maintain the thrust trace, the elastic body, and the race retainer efficiently and appropriately without causing a change in the preload adjustment of the elastic body even by the caulking process. It is an issue.

[Means for Solving the Problems] According to the method of the present invention, a clamping force equivalent to that of a finished product is applied to a semi-assembled product including a matching cylinder block, a housing, and components related to a drive shaft housed therein. After adjusting the screwing of the race holder, the rear end of the drive shaft is properly received through the preloaded elastic body and thrust trace, and then the thrust trace of the drive shaft once released is released. In this state, the elastic body is deformed to the utmost by pressing in the direction, thereby performing a crimping process on the race presser in a state where the fine movement of the race presser due to the backlash of the screw is sealed.

The device of the present invention is configured such that the semi-assembled product can be placed in an upright position in which the cylinder block is positioned upward, and the housing outer end is independently biased through each of the existing bolt holes. A first urging means for pressing the semi-assembled product between a lid plate fixed above and a hub mounting screw at the front end of the drive shaft to pull the drive shaft toward the housing. A nut jig to be detained, a rotation means having an operation shaft engaged with the nut jig, and screwing the nut jig in a direction to release the detention of the drive shaft; and a linear movement of the operation shaft. A second urging means for urging the front end of the drive shaft, which has been released from detention, upward, and deforming the elastic body receiving the rear end of the drive shaft as much as possible is adopted.

Embodiment An embodiment of the present invention will be described below with reference to FIGS.

FIG. 1 shows a semi-assembled part of a compressor. In the figure, a crank chamber is provided inside a front end face of a cylinder block 10.
The housing 14 formed with 12 is aligned, and the rear end face is opened in a state where a valve plate and a cylinder head (not shown) are not mounted.

A drive shaft 24 driven from a transmission system via a clutch (not shown) is rotatably supported via a radial bearing 26 on the cylinder block 10 and the housing 14, and a hub mounting screw 24b screwed to the hub at the front end is provided. Is formed. A rotator 28 is fitted on the drive shaft 24, and a oscillating plate 30 having a known structure is provided on the rotator 28. The rocking plate
The piston 30 is connected to a piston 32 that slides in the cylinder bore 10a through a piston rod 34, and the piston 32 reciprocates by swinging of the swing plate 30 accompanying rotation of the drive shaft 24. Then, the stroke of the piston 32 is changed by the tilt displacement of the swinging plate 30 responsive to the pressure difference between the pressure in the crank chamber 12 and the suction pressure, thereby controlling the discharge capacity. Reference numeral 36 denotes a thrust bearing sandwiched between an inner end wall surface of the housing 14 forming the crank chamber 12 and an end surface of the rotating body 28, which receives a thrust load accompanying a compression reaction force of the piston 32. I have.

A counterbore 38 including a screw hole 38a having a depth such that the rear end 24a of the drive shaft 24 is exposed from the rear end surface of the cylinder block 10 is formed in the axis of the cylinder block 10.

FIG. 2 shows a state in which an element for receiving the rear end of the drive shaft 24 is further incorporated into the semi-assembled product. In FIG. 2, reference numeral 44 denotes a drive shaft in which the pressure in the crank chamber 12 acts as a thrust load.
24 is a thrust trace that receives the rear end 24a of the drive shaft 24, and is inserted into the counterbore 38 to abut against the rear end of the drive shaft 24;
A locking claw 44a projecting from the outer peripheral surface is engaged with a detent groove 40 formed in the counterbore 38. In addition, a Cu-Pb-based sintered layer for improving the seizure resistance is provided on the side of the thrust trace 44 which is in sliding contact with the drive shaft 24, and an oil groove is also engraved (FIG. 3).

Reference numeral 46 denotes a race holder screwed into the screw hole 38a, which applies a pre-compression to the disc spring 48 by adjusting the tightening torque, and the adjustment completion position is held by a caulking loosening prevention process.

In the embodiment shown in FIG.
As shown in the drawing, the present invention relates to a method and an apparatus for assembling and locking a thrust trace 44, a disc spring 48, and a race retainer 46.

FIG. 4 schematically shows the entire structure of the assembling apparatus. In the figure, the gantry 50 is horizontal on the upper surface, and a lid plate 52 is horizontally placed on the upper end of a column 51 erected at the corner of the gantry 50. Fastened and fixed.
A board 54 is slidably mounted in the center of the gantry 50 in a direction perpendicular to the plane of the drawing, and a manifold plate 55 is further fixed on the upper surface of the board 54. An annular oil supply groove 55a is formed. This oil supply groove 55a
Is connected to a hydraulic source (not shown) via a pipe connected to the passage 55b and a pipe screw.

Reference numeral 56 denotes a cylindrical support having a hollow portion 56b at the center of the shaft, and a flange at the lower end portion is fastened and fixed to a manifold plate 55, and a semi-assembled product of the compressor is provided at an upper opening of the hollow portion 56b. A cylindrical body 56c for supporting the camera in a standing posture is inserted. Positioning pins 56d for engaging with the semi-assembled product are implanted in the cylindrical body 56c. The support 5
6 is provided with six shaft holes 56e vertically aligned with the through bolt holes 14a formed in the semi-assembled product. Each of the shaft holes 56e has a main element of the first urging means. The cylindrical piston member 60 is inserted. The lower half of each shaft hole 56e is formed in a slightly large-diameter cylinder chamber 56e ', and its lower end opening communicates with the oil supply groove 55a, respectively.
Sealed by a ring. And the piston member
Two sealing rings 60a fitted on the cylinder 60 are tightly fitted to the cylinder chamber 56e '. Reference numeral 60b is a coil spring that biases the piston member 60 downward.

At the center of the manifold plate 55, a sleeve 71 which is allowed to move only in the axial direction in alignment with the axis of the semi-assembled product.
The operating shaft is screwed into the sleeve 71 with a left-hand thread having a smaller pitch than the hub mounting screw 24b.
70 is inserted. The lower portion of the operation shaft 70 extends through the hollow portion of the substrate 54 into the relief groove 50a formed horizontally on the gantry 50, and a bevel gear is provided at a portion passing through the hollow portion of the substrate 54. 70a is provided integrally. On the other hand, the operation shaft 7
A hexagonal column-shaped engaging portion 70c is formed at the upper part of 0, and a protruding portion 70d that is in contact with the front end of the drive shaft 24 is formed at the tip thereof.

A rotating shaft 54a having a bevel gear 54b meshing with the bevel gear 70a is horizontally and rotatably held on the substrate 54. When the lower end of the operating shaft 70 cooperating with the substrate 54 moves to an operating position facing a piston rod 80, which will be described later, the outer end of the rotating shaft 54a is the shaft of the handle 51 supported by the base 50.
51a can be engaged. Inside the gantry 50, second urging means for pushing the operation shaft 70 upward at the above-mentioned operation position, that is, a piston rod of a hydraulic cylinder (not shown)
80 have been extended.

Reference numeral 90 denotes a cylindrical nut jig which is provided independently of the device main body and pulls and restrains the drive shaft-related element of the semi-assembled product toward the housing 14. The cylindrical nut jig is engaged with the hub mounting screw 24 b of the drive shaft 24. A screw portion 90a and a hexagonal hole 90b fitted in the engaging portion 70c of the operation shaft 70 are provided in series.

Reference numeral 61 denotes a relay element which is similarly mounted at the end of each of the bolt holes 14a of the semi-assembled product, and a sealing annular rubber 61a is fitted to the body, and a head end which abuts against the piston member 60 is a housing.
It is formed so as to slightly protrude from the outer end of 14. 62 is the cylinder block 10 and housing 14
This rod is inserted into the through-bolt hole 14a in order to maintain alignment with the rod.

 Next, the operation of the present embodiment will be described in detail.

The substrate 54 of the present apparatus is initially set at a position not facing the cover plate 52.

First, the rod 62 is inserted into one of the six bolt holes 14a of the half-assembled product of the compressor, and then the relay element 61 is loaded into the opening end of each bolt hole 14a, and then the nut jig 90 is driven. It is screwed into the hub mounting screw 24b of the shaft 24 and fastened to the end of the housing 14. As a result, the related elements including the drive shaft 24 are towed and held at the limit position on the housing 14 side. In this state, the semi-assembled product is placed in an upright posture and placed so that the relay element 61 and the distal end of the piston member 60 are in contact with each other. At this time, after the hexagonal hole 90b of the nut jig 90 is engaged with the operation shaft 70c in advance, the semi-assembled product is fitted to the positioning pin 56d.

Thereafter, when the substrate 54 is slid to move the lower end of the operating shaft 70 to the operating position where the lower end of the operating shaft 70 faces the piston rod 80, the rear end surface (the upper surface in FIG. Face each other.

When the movement is completed, pressure oil is supplied by a hydraulic source (not shown), and the piston member 60 is urged upward through the passage 55b and the oil supply groove 55a. At this time, each cylinder chamber 56e '
Since the connection is conducted through 5a, all the hydraulic pressures applied to the six relay elements 61 are balanced, so that the semi-assembled product urged through the bolt hole 14a is pressed between the cover plate 52 and the half assembly. The distortion is absorbed, and the same tightening state as at the time of assembly is obtained.

In this state, the thrust trace 44 and the disc spring 48 are inserted into the counterbore 38 in this order through the opening 52a of the lid plate 52, and the screw hole 38a is inserted.
Then, the race retainer 46 is screwed into the spring and tightened with an appropriate torque, and an appropriate preload is applied to the disc spring 48.

After that, the shaft 51a of the handle 51 is engaged with the rotation shaft 54a,
By turning the handle 51, the rotating shaft 54a is rotated. As a result, the operation shaft 70 is engaged through the engagement of the bevel gear 54b and the bevel gear 70a.
Rotates.

The state before and after the rotation of the operation shaft 70 is shown in FIGS. Here, the screw of the operation shaft 70 is left-handed and the hub mounting screw is
Since the pitch is smaller than 24b, the nut jig 60 can sufficiently satisfy the next push-up tightening margin for a slight rise of the operation shaft 70.
Just descend.

Then the piston rod based on the drive of the hydraulic cylinder
By the operation of 80, the drive shaft 24 is urged upward through the operation shaft 70, and the disc spring 48 is ultimately deformed. With this bias, the race retainer 46 immovably holds the upper limit position of the screw backlash.

FIG. 7 shows such an elevated state of the operation shaft 70. Operation axis 70
Rises together with the sleeve 71, and the protrusion 70d abuts on the front end of the drive shaft 24 to raise the drive shaft 24.
Has an extra air gap between the housing 14 and the housing 14. In this case, the rise value of the thrust trace 44 is measured by the dial gauge through the opening 52a of the cover plate 52, and it is possible to confirm whether the preload deformation applied to the disc spring 48 is appropriate.

In this state, a caulking process is performed on the threaded portion of the race holder 46 by, for example, a manual operation using a punch or the like. Therefore, even when an external force due to caulking is applied, the race presser does not move slightly and is fixed to the limit position of the backlash.

After the assembly is completed as described above, the piston rod 80 is lowered, and the pressure oil acting on each piston member 60 is returned to release the tightened state of the semi-assembled product.
To restore the positional relationship between the operating shaft 70 and the sleeve 71 to the initial state, disengage the engagement between the handle 51 and the rotating shaft 54a, and then return the substrate 54 to the original position where it does not interfere with the cover plate 52. After returning to the sliding position, the semi-assembled product whose drive shaft rear end 24a is properly received is removed from the support 60.

[Effects] As described in detail above, according to the present invention, the semi-assembled product is brought into the exact same tightening state as after the completion of the assembly and the race holder is tightened by the assembling method described in the claims. It is possible to apply an appropriate preload to the elastic body without causing any deviation, and from such a state, fix the race holder immovably through the ultimate deformation of the elastic body, and then caulking processing to prevent rotation Therefore, even if an external force of caulking is applied, the race retainer does not generate fine dust due to backlash, and the rear end of the drive shaft is stably received without disturbing the pressure regulation degree.

In addition, the present invention employs the device described in the claims to detain the drive shaft-related elements incorporated in the semi-assembled product on the housing side, maintain the aligned condition of the semi-assembled product, and perform each through-hole operation. There is a feature that a series of operations such as uniform narrow pressure through a bolt hole, and ultimate deformation urging of an elastic body via a drive shaft following release of the detention can be quickly and reliably performed.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a semi-assembled product of the swinging plate type variable displacement compressor according to the embodiment, FIG. 2 is a sectional view showing a thrust trace, a disc spring and a race retainer after being assembled, and FIG. FIG. 4 is a plan view of the thrust trace, and FIG. 4 is a sectional view showing the assembling apparatus of the present embodiment. FIGS. 5, 6, and 7 are partial cross-sectional views showing the relative positional relationship between the operation shaft and the nut jig. FIG. 5 is a detained state by the nut jig, and FIG. 6 is a release of the detention. State, FIG. 7 shows a state when the disc spring is deformed to the limit. 10 ... Cylinder block, 14 ... Housing 24 ... Drive shaft 24b ... Hub mounting screw 44 ... Thrust trace, 46 ... Lace retainer 48 ... Disc spring, 50 ... Stand 51 ... Handle, 52 ... Lid plate 54 …… Substrate, 54a …… Rotating shaft 55 …… Manifold plate, 56 …… Support body 60 …… Piston member, 61 …… Relay element 70 …… Operation shaft 80 …… Piston rod, 90… Nut fixing Ingredient

Claims (2)

(57) [Claims] A rear end of a drive shaft extending from a housing forming a crank chamber into a cylinder block is received via an elastic body and a thrust trace adjusted by a displaceable race retainer. A method for assembling a swinging plate type variable displacement compressor according to claim 1, wherein the matching cylinder block and a drive shaft-related component contained in the housing are towed and restrained toward the housing, and the cylinder block and the housing are connected to each other. The process of axially compressing to reveal the actual tightening state. The thrust trace and the elastic body that comes into contact with the rear end of the drive shaft from the screw hole opening end at the rear end of the cylinder block are sequentially inserted and screwed into the screw hole. Adjusting the tightening torque of the race holder to apply an appropriate preload to the elastic body, releasing the above-mentioned detention related to the drive shaft, and pressing it in the thrust trace direction to ultimately change the elastic body. Is to process, extreme step of applying caulking treatment threaded portion of the variant race retainer while maintaining a wobble plate type variable displacement compressor assembly method comprising a city of the elastic body. 2. A drive shaft extending from a housing forming a crank chamber into a cylinder block is received by an elastic body and a thrust trace adjusted by a displaceable race retainer. An assembling device for a swinging plate type variable displacement compressor, comprising: a semi-assembled product including a matching cylinder block and a housing, and drive shaft-related components housed therein; Between the support member which is configured to be able to be placed in the upright posture and the outer end of the housing which is independently urged through each of the existing bolt holes, and which is fixed to the upper cover plate. First urging means for clamping the assembled product, a nut jig screwed into a hub mounting screw at the front end of the drive shaft to pull and restrain the drive shaft toward the housing, and an operation for engaging with the nut jig Releases detention of drive shaft with shaft And a rotating means for screwing the nut jig in a direction in which the front end of the drive shaft released from the restraint is urged upward through the direct movement of the operation shaft to receive the rear end of the drive shaft. An assembling apparatus for an oscillating plate type variable displacement compressor, comprising: a second urging means for deforming the elastic body to the limit.