JPH05164046A - Compressor - Google Patents

Abstract

PURPOSE:To easily give appropriate pressure force to the front side against a rotation shaft at the time of assembling a compressor and to improve perfor mance of assembly work. CONSTITUTION:A fitting tubular body 23 with a fitting hole 24 and a pressure force adjustment member 24 to be forcibly fit in the fitting hole 24 are interposed between a rear side edge surface 8a of a rotation shaft 8 and a valve plate 7. Thereafter, in an assembly process to connect the valve plate 7 to the rear edge surface of a cylinder block 1, the pressure force adjustment member 25 is forcibly fit in the fitting hole 24 of the fitting tubular body 23.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a compressor suitable for a swing swash plate type variable displacement type compressor.

[0002]

2. Description of the Related Art Conventionally, as an example of this type of swash plate type variable displacement compressor, the one disclosed in Japanese Patent Laid-Open No. 60-135680 has been proposed. This variable displacement compressor has a front housing forming a crank chamber on the front side of a cylinder block having a plurality of cylinder bores and shaft holes, and a rear housing forming a suction chamber and a discharge chamber via a valve plate on the rear side. A housing is provided, and a rotary shaft is supported in the shaft hole of the front housing and the cylinder block so as to penetrate the crank chamber, and is housed in the cylinder bore through rotation of the rotary shaft and a swing swash plate by rotation of the rotary shaft. The piston is reciprocated so that the gas in the suction chamber is sucked into the cylinder bore and compressed, and the compressed gas is discharged to the discharge chamber. Further, the stroke of the piston is changed by changing the inclination angle of the swing swash plate according to the pressure difference between the pressure in the crank chamber and the suction pressure, so that the compression capacity is controlled. Further, a screw hole is formed in the center hole of the cylinder block that supports the rear end of the rotary shaft, and an adjusting screw for pressing the rotary shaft to the front side is screwed into the screw hole. Then, by rotating and adjusting the adjusting screw, the axial position of the rotating shaft is adjusted. That is, the axial clearance of the portion of the thrust bearing that is interposed between the inner surface of the front housing and the rotary support and supports the compression reaction force is adjusted.

[0003]

In the conventional variable displacement compressor described above, the adjusting screw for adjusting the axial gap of the rotary shaft, that is, the axial gap of the thrust bearing portion is
Since it is necessary to screw it into the center hole formed in the cylinder block, the assembly process is troublesome, and it is necessary to measure the tightening force of the adjusting screw or the tightening amount of the adjusting screw. There is a problem that mass production is difficult. In particular, since the adjusting screw generates a large axial pressing force with a small amount of rotational torque, the allowable tolerance is small and it is very difficult to improve the work efficiency.

An object of the present invention is to provide a compressor capable of supporting the rotary shaft rear end portion with an appropriate pressing force without performing any adjusting step in the assembling step of the compressor and enhancing the assembling work efficiency. To provide.

[0005]

In order to achieve the above object, the invention according to claim 1 provides a front housing forming a crank chamber on the front side of a cylinder block having a plurality of cylinder bores and shaft holes, and a rear side. Is provided with a rear housing that forms an intake chamber and a discharge chamber via a valve plate, and a rotary shaft is supported in the shaft hole of the front housing and the cylinder block so as to penetrate the crank chamber, and driven by rotation of the rotary shaft. In a compressor configured to reciprocate a piston housed in the cylinder bore through a mechanism to suck and compress gas in the suction chamber into the cylinder bore and discharge compressed gas to the discharge chamber, A fitting cylinder having a fitting hole between the rear end surface of the shaft and the valve plate or the rear housing;
A means for interposing a pressing force adjusting member that is press-fitted into the fitting hole of the fitting cylinder is adopted.

According to a second aspect of the present invention, in the first aspect, a pressing force adjusting member is connected to the rear end of the rotary shaft so as to be rotatable synchronously, and the pressing force adjusting member is connected to the fitting cylinder body. It is press-fitted into the fitting hole so that it can rotate synchronously with the rotating shaft. A gas guide groove communicating with the cylinder bore during the suction stroke is formed on the outer peripheral surface of the fitting cylinder, and the inside of the fitting cylinder is also formed. Is provided with a suction passage that communicates the guide groove with the suction chamber, and the cylinder block or the valve plate is formed with a gas suction passage that communicates the guide groove of the fitting cylinder with the cylinder bore during the suction stroke. Then, the fitting cylinder is provided with a function as a rotary valve.

[0007]

According to the present invention, the rear end surface of the rotary shaft inserted into the center hole of the cylinder block and the valve plate or the rear housing are separated from the cylinder block in the compressor assembling step with the valve plate or the rear housing being separated from each other. When the valve plate or the rear housing is pressed toward the rear end surface of the cylinder block with the fitting cylinder and the pressing force adjusting member interposed between
The pressing force adjusting member is press-fitted into the fitting hole of the fitting cylinder.
In this fitted state, an appropriate pressing force is applied to the front end of the rear end of the rotary shaft. Therefore, the step of adjusting the pressing force of the rotary shaft is unnecessary, and the work efficiency can be improved.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment embodying the present invention will now be described with reference to FIG.
~ It demonstrates based on FIG. A front housing 2 forming a crank chamber 2a is integrally formed at the front end of the cylinder block 1, and a front end plate 3 is joined and fixed to the front end of the housing 2. Further, the suction chamber 4 is provided on the rear end surface of the cylinder block 1.
Also, a rear housing 6 that defines and forms the discharge chamber 5 is joined and fixed via a valve plate 7.

A rotary shaft 8 is rotatably supported on the front end plate 3 and the cylinder block 1 by a radial bearing 9. A rotary support 10 is fitted and fixed on a rotary shaft 8 in the crank chamber 2a, and a rotary swash plate 11 is swingable in the front-rear direction by a pin 12 on the rotary support 10 and is rotatable. It is supported so that it can rotate together with. A swing swash plate 13 is mounted on the rotary swash plate 11 so as to be rotatable relative to the rotary swash plate 11 and non-rotatable by a guide rod 14 guided by a guide groove 2b formed in the front housing 2. There is.

A cylinder block 1 is attached to the swing swash plate 13.
The pistons 17 housed in the plurality of cylinder bores 1a formed in the above are connected via a piston rod 18.
Then, when the rotary shaft 8 is rotated, the rotary support 1
0, the pin 12, and the rotary swash plate 11 are rotated, so that the rocking swash plate 13 is rocked in the front-rear direction, and the piston 17 is reciprocated back and forth in the cylinder bore 1a via the piston rod 18 to move the suction chamber. The refrigerant gas sucked from No. 4 through the suction hole 19 is compressed in the cylinder bore 1 a, and the compressed gas is discharged into the discharge chamber 5 through the discharge hole 20. A compression reaction force acts on the rotary support 10 during this compression operation, and this reaction force is supported by the thrust bearing 15 interposed between the front end plate 3 and the rotary support 10.

In the center hole 1b of the cylinder block 1, between the rear end surface 8a of the rotary shaft 8 and the valve plate 7, there is a fitting cylinder 23 and a fitting hole 2 formed therein.
The pressing force adjusting member 25 that is press-fitted into the pressure roller 4 is interposed. As shown in FIG. 2, the diameter D1 of the pressing force adjusting member 25
Is set to be larger than the diameter D2 of the fitting hole 24 of the fitting tubular body 23 by, for example, about 0.1 to 20 μm, and both are press-fitted in the assembly process.

When the fitting cylinder 23 and the pressing force adjusting member 25 are assembled, as shown in FIG.
Is not joined to the rear end surface of the cylinder block 1, the rear end portion of the pressing force adjusting member 25 is slightly fitted into the fitting hole 24 of the fitting tubular body 23, and the front end surface 25a of the pressing force adjusting member 25 is inserted. Is brought into contact with the rear end surface 8a of the rotary shaft 8 so that the rear end surface 23a of the fitting tubular body 23 projects a predetermined length from the rear end surface of the cylinder block 1.

Next, when the valve plate 7 is joined to the rear end face of the cylinder block 1 and the fitting cylinder 23 is pressed toward the front side by the valve plate 7, the fitting cylinder 2 is pressed.
As shown in FIG. 1, the pressing force adjusting member 25 is press-fitted into the fitting hole 24 of No. 3 for a predetermined length. As a result, an appropriate pressing force acts on the rotating shaft 8 toward the front side, and the rotating shaft 8 The thrust bearing 15 is pressed against the inner surface of the front end plate 3 with a proper pressure via the rotary support 10.

Since the joint surface between the rotary shaft 8 and the pressing force adjusting member 25 is brought into sliding contact when the rotary shaft 8 is rotated,
It is desirable to use a material having excellent wear resistance as the material of the pressing force adjusting member 25. Further, a thrust bearing (not shown) may be interposed between the rotary shaft 8 and the pressing force adjusting member 25. Further, as shown in FIG.
It is also possible to form a key groove 23b on the outer periphery of 3 and to engage the fitting cylindrical body 23 in the central hole 1b of the cylinder block 1 with the key 26 so as not to rotate.

As described above, according to the above embodiment,
When assembling the rotary shaft 8, the step of adjusting the tightening force like an adjusting screw is omitted, and the position of the rotary shaft 8 is easily regulated by using the assembly process of the valve plate 7.
The pressing force on the front side of the rotary shaft 8 can be easily adjusted to an appropriate pressure.

Next, another embodiment of the present invention will be described with reference to FIGS.
It will be explained based on. As shown in FIG. 5, the swing swash plate type variable displacement compressor of this another example has a discharge chamber 5 formed on the outer peripheral side of a rear housing 6 and a suction chamber 4 formed at the center thereof. The suction valve mechanism K for the refrigerant gas sucked into the cylinder bore 1a is of a rotary valve type. This intake valve mechanism K is a cylinder block 1
A valve accommodating chamber 27 formed by a central hole 1b of the valve plate 7, a central hole 7a of the valve plate 7, and an inner peripheral surface 6b of a partition wall 6a that defines the suction chamber 4 and the discharge chamber 5 of the rear housing 6.
However, the rotary valve 28 is housed therein. As shown in FIG. 6, a gas guide groove 29 is formed in the rotary valve 28 in a predetermined range, and a gas suction passage 30 that connects the guide groove 29 and the suction chamber 4 is formed. Further, as shown in FIG. 7, the cylinder block 1 is formed with a gas suction passage 1c for communicating the gas guide groove 29 with the cylinder bore 1a during the suction stroke in a radial pattern corresponding to each cylinder bore 1a. ing.

A rear end surface of the rotary valve 28,
A thrust bearing 31 is interposed between the suction chamber 4 and the inner bottom of the suction chamber 4. A pressing force adjusting member 33 is press-fitted into a fitting hole 32 formed in the front end surface of the rotary valve 28, and a square cylindrical engaging hole 34 is formed at the center of the adjusting member 33. .. On the other hand, an engaging convex portion 35 is integrally projected on the rear end surface 8a of the rotary shaft 8, and the convex portion 35 is loosely engaged with the engaging hole 34 as shown in FIG. The motion is transmitted to the rotary valve 28 via the pressing force adjusting member 33. Further, the pressing force adjusting member 33 and the rear end surface 8a of the rotary shaft 8 are
A disc spring 36 is interposed between and.

Therefore, in this embodiment, the rotary shaft 8
Is rotated, the pressing force adjusting member 3 is moved by the engaging convex portion 35.
3 and the rotary valve 28 are rotated, and the suction passage 30 formed in the rotary valve 28 from the suction chamber 4, the gas guide groove 30, and the suction passage 1c formed in the cylinder block 1
Gas is sucked into the cylinder bore 1a during the suction stroke via the.

In this embodiment, the rotary valve 28
Since the adjusting member 33 is press-fitted into the fitting hole 32 of the rotary valve 28 at the time of assembling the pressing force adjusting member 33, the rotary shaft 8 is pressed toward the front side with an appropriate pressure, and the thrust bearings 15 and 31. An appropriate pressing force is applied to.

The present invention is not limited to the above-described embodiments, but may be embodied in various compressors such as a vane compressor other than the swing swash plate type variable displacement compressor. ..

[0021]

As described in detail above, according to the present invention, it is possible to easily apply an appropriate pressing force to the rotary shaft toward the front side when assembling the compressor, and improve the efficiency of the assembling work. There is an effect that can be.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a swing swash plate type variable displacement compressor showing an embodiment embodying the present invention.

FIG. 2 is an enlarged exploded perspective view of a main part.

FIG. 3 is an enlarged sectional view of a main part.

FIG. 4 is a perspective view of only a fitting cylinder showing another embodiment of the present invention.

FIG. 5 is a vertical cross-sectional view of a central portion of a compressor showing another embodiment of the present invention.

FIG. 6 is an enlarged exploded perspective view of a main part.

FIG. 7 is a cross-sectional view of the suction valve mechanism.

FIG. 8 is a cross-sectional view of a main part.

[Explanation of symbols]

1 Cylinder Block, 1b Center Hole, 2 Crank Chamber, 3 Front Housing, 4 Suction Chamber, 5 Discharge Chamber, 6 Rear Housing, 8 Rotating Shaft, 8a Rear End Face, 10 Rotating Support, 11 Rotating Swash Plate, 13 Swing Oblique Plate, 17 piston, 23 fitting cylinder, 24 fitting hole,
25 pressing force adjusting member, 28 rotary valve, 29
Gas guide groove, 30 gas suction passage, 32 fitting hole, 3
3 pressing force adjusting member, D1 diameter of pressing force adjusting member 25, D2 diameter of fitting hole 24.

Claims (2)

[Claims] 1. A front housing which forms a crank chamber is provided on the front side of a cylinder block having a plurality of cylinder bores and shaft holes, and a rear housing which forms an intake chamber and a discharge chamber via a valve plate is provided on the rear side. A rotation shaft is supported in a shaft hole of the front housing and a cylinder block so as to pass through a crank chamber, and rotation of the rotation shaft causes a piston housed in the cylinder bore to reciprocate through a drive mechanism to suck the intake air. In a compressor configured to suck gas in a chamber into a cylinder bore and compress the gas to discharge the compressed gas into the discharge chamber, a compressor is fitted between a rear end surface of the rotary shaft and the valve plate or the rear housing. A compressor having a fitting cylinder having a fitting hole and a pressing force adjusting member press-fitted into the fitting hole of the fitting cylinder. 2. The pressing force adjusting member according to claim 1, wherein the pressing force adjusting member is synchronously rotatably connected to the rear end of the rotating shaft, and the pressing force adjusting member is press-fitted into the fitting hole of the fitting cylinder. And a gas guide groove communicating with the cylinder bore during the suction stroke is formed on the outer peripheral surface of the fitting cylinder, and the guide groove and the suction inside the fitting cylinder. A suction passage communicating with the chamber is provided, and a gas suction passage that communicates the guide groove of the fitting cylinder with the cylinder bore during the suction stroke is formed in the cylinder block or the valve plate. A compressor with the function of a valve.