JPH09287582A - Vane compressor and fixation method of its rotor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve strength of a rotor and dispense with an intermediate pressure supply groove of a side block. SOLUTION: A driving shaft 7 is press-fitted into a center hole 2b of a rotor 2. A cylindrical caulking punch 31 is abutted against a bottom 13a of each of a plurality of vane grooves 13 on an end face of the rotor 2, for applying hammering thereto. The rotor 2 is thus caulked and fixed to a rotary shaft 7. In press-fitting the driving shaft 7 into a center hole 2a of the rotor 2, the rotor 2 is not necessarily heated. An inner peripheral surface of the center hole 2a of the rotor 2 is evenly fixed over all circumference of a knurling part of the driving shaft 7, for improving the strength of the rotor. A circular intermediate pressure supply groove 30 is formed on the end face of the rotor 2 which is communicated with the bottom 13a of each vane groove 13 with each caulking. Fixation of the rotor 2 and processing of the intermediate pressure supply groove 30 can be done with one process.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vane type compressor and a rotor fixing method thereof.

[0002]

2. Description of the Related Art FIG. 7 is a longitudinal sectional view of a conventional vane type compressor, FIG. 8 is a view showing an end face of a rotor, and FIG. 9 is a view showing a front end face of a rear side block.

As shown in FIG. 7, a conventional vane type compressor includes a cam ring 101, a rotor 102 rotatably housed in the cam ring 101, a drive shaft 107 to which the rotor 102 is fixed, and a cam ring 101. A front side block 103 fixed to the front end surface, a rear side block 104 fixed to the rear end surface of the cam ring 101, a front head 105 fixed to the front end surface of the front side block 103, and a rear side of the rear side block 104. A rear head 106 fixed to the side end surface, a plurality of vane grooves 113 provided on the outer peripheral surface of the rotor 102, and a plurality of vanes 114 slidably inserted in the vane grooves 113 are provided. Drive shaft 107
Are rotatably supported by bearings 108 and 109.

As shown in FIG. 8, the plurality of vane grooves 113 are provided substantially radially around the drive shaft 107.

As shown in FIG. 9, an intermediate pressure supply groove 141 communicating with the bottom 113a of the vane groove 113 is provided on the front end surface of the rear side block 104 from the start of suction to the end of compression. An intermediate pressure supply groove 141 is similarly provided on the rear end surface of the front side block 103.

Into the intermediate pressure supply groove 141, refrigerant and lubricating oil at an intermediate pressure between high pressure and low pressure are introduced through a gap between the front side end surface of the rear side block 104 and the front side end surface of the rotor 102. From the start of suction to the end of compression, the intermediate pressure supply groove 141 is the bottom 113 of the vane groove 113.
Since it communicates with a, the refrigerant and the lubricating oil in the intermediate pressure supply groove 141 are supplied to the bottom 113 a of the vane groove 113. As a result, when the rotor 102 rotates, the vanes 114 jump out smoothly.

[0007]

By the way, conventionally, in order to fix the rotor 102 to the drive shaft 107, the rotor 102 has to be fixed.
Is heated, and the drive shaft 1 is inserted into the center hole of the rotor 102.
Press in 07. In this way, the rotor 102 is fixed to the drive shaft 107.

However, due to bending of the drive shaft 107 and the like,
When the drive shaft 107 is press-fitted into the rotor 102 with the center of the rotor 102 and the center of the drive shaft 107 deviated from each other, the outer peripheral surface of the drive shaft 107 does not uniformly contact the center hole 102a of the rotor 102, When the rotor 102 cools, only a part of the inner peripheral surface of the center hole 102a of the rotor 102 is firmly fixed to the outer peripheral surface of the drive shaft 107 (the rotor 10).
Since the inner peripheral surface of No. 2 does not dig into the knurls of the drive shaft 107 over the entire circumference), the strength of the rotor 102 decreases, and for example, a crack is formed from the vane groove 113 toward the center of the rotor 102, and the rotor 102 is The problem of breakage arises.

Further, as described above, the rear side block 1
04 front end face, front side block 103
Since the intermediate pressure supply groove 141 is provided on the rear end surface of the bearings 108, 1 supporting the drive shaft 107 accordingly.
09 must be arranged separately from the rotor 102, which causes a problem that abnormal noise occurs due to resonance or wear of the drive shaft 107.

The present invention has been made in view of such circumstances, and an object thereof is to provide a vane type compressor capable of improving the strength of the rotor and eliminating the intermediate pressure supply groove of the side block. That is.

[0011]

In order to solve the above problems, a vane type compressor according to a first aspect of the present invention is provided with a rotor fixed to a drive shaft and rotatably housed in a cam ring, and the cam ring. A first side member fixed to one side and rotatably supporting one end of the drive shaft, and a second side member fixed to the other side of the cam ring and rotatably supporting the other end of the drive shaft. A vane compressor provided with a plurality of vane grooves provided substantially along the radial direction of the rotor, and vanes slidably inserted in the vane grooves, wherein the vane groove is provided on an end surface of the rotor. Is provided with a pressure supply groove communicating with the bottom portion of the.

Since the pressure supply groove communicating with the bottom of the vane groove is provided on the end surface of the rotor as described above, it is not necessary to provide the pressure supply groove on both side members, so that the bearings for supporting both ends of the drive shaft are respectively provided. It can be arranged at a position close to the rotor, and the resonance point of the drive shaft can be raised.

According to a second aspect of the present invention, there is provided a method for fixing a rotor of a vane compressor, wherein a drive shaft is press-fitted into a center hole of a rotor, and a plurality of vane groove bottom portions of an end surface of the rotor are fitted with cylindrical caulking punches. The rotor is struck and the rotor is caulked and fixed to the drive shaft.

As described above, when the drive shaft is press-fitted into the center hole of the rotor, the rotor is not heated, so that the inner peripheral surface of the rotor is fixed to the knurled portion of the drive shaft over the entire circumference without unevenness, and the strength of the rotor is improved. Is improved.

Further, the tip of the caulking punch is brought into contact with the bottom of the vane groove on the end surface of the rotor, the rear end of the caulking punch is hit to caulk the rotor, and the rotor is fixed to the drive shaft. Has a pressure supply groove communicating with the bottom of each vane groove, and the fixing of the rotor and the processing of the pressure supply groove can be performed in one step.

According to a third aspect of the present invention, there is provided a method for fixing a rotor of a vane type compressor according to the second aspect of the invention, wherein the rotor shaft is fixed before the drive shaft is press-fitted into a central hole of the rotor. In addition, a recess is provided at a position on the outer peripheral surface of the drive shaft where the rotor is fixed.

At the bottom of the plurality of vane grooves on the end surface of the rotor,
When a cylindrical caulking punch is applied and hit, a part of the rotor enters the recess of the drive shaft, so that the rotor is more firmly fixed to the drive shaft and the strength of the rotor is further improved.

[0018]

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

FIG. 1 is a longitudinal sectional view of a vane type compressor according to an embodiment of the present invention, FIG. 3 is a view showing an end face of a rotor, and FIG. 4 is a view showing a front side end face of a rear side block.

This vane type compressor has a cam ring 1,
A front side member (first side member) 25 and a rear side member (second side member) 20 respectively arranged on both end surfaces of the cam ring 1, a rotor 2 rotatably housed in the cam ring 1, and a drive of the rotor 2. And a shaft 7. The drive shaft 7 is rotatably supported by bearings 8 and 9.

The front side member 25 comprises a front side block 3 fixed to the front end surface of the cam ring 1 via an O-ring 21, and a front head 5 fixed to the front end surface of the front side block 3. Has been done.

The front head 5 has a discharge port 5 for the refrigerant gas.
a is formed, and the ejection port 5 a communicates with the ejection chamber 10 formed by the front head 5 and the front side block 3.

The rear side member 20 is the cam ring 1
The rear side block 4 is fixed to the rear side end surface of the rear side block 4 via an O-ring 22, and the rear head 6 is fixed to the rear side end surface of the rear side block 4. The rear head 6 is provided with a refrigerant gas suction port 6a.
The a communicates with the suction chamber 11 formed by the rear side block 4 and the rear head 6.

As shown in FIG. 4, the rear side block 4 is provided with a suction port 12a for feeding a low-pressure refrigerant gas from the suction chamber 11 to a compression chamber described later in the suction stroke. As is clear from comparison between FIG. 4 and FIG. 9, the intermediate pressure supply groove is not provided in the rear side block 4 of this embodiment.

Two upper and lower compression spaces 12 are formed between the inner peripheral surface of the cam ring 1 and the outer peripheral surface of the rotor 2 (only one compression space 12 is visible in FIG. 1). . A plurality of vane grooves 13 are provided in the rotor 2 along substantially the radial direction of the rotor 2 (see FIG. 3), and vanes 14 are slidably inserted in the vane grooves 13. The compression space 12 is partitioned by the vanes 14 to form a plurality of compression chambers, and the volume of each compression chamber changes with the rotation of the rotor 2.

The outer peripheral wall of the cam ring 1 is provided with two discharge ports 16 corresponding to the two compression spaces 12 (only one discharge port 16 is visible in FIG. 1). Further, a valve stopper 1 is provided on the outer peripheral wall of the cam ring 1.
A discharge valve cover 17 having 7 a is fixed by bolts 18. A discharge valve 19 that opens and closes the discharge port 16 is interposed between the outer peripheral wall of the cam ring 1 and the valve stop portion 17a. When the discharge port 16 is opened, the high-pressure refrigerant gas in the compression chamber is discharged from the discharge port 5a via the discharge port 16, the passages 2a and 3a, and the discharge chamber 10.

2 and 3 are provided on both end surfaces of the rotor 2.
As shown in FIG. 3, an annular intermediate pressure supply groove (pressure supply groove) 30 that communicates with the bottom portion 13 a of the vane groove 13 is provided. The intermediate pressure supply groove 30 is a groove formed when the rotor 2 is fixed to the drive shaft 7.

A method of fixing the rotor 2 will be described with reference to FIGS. 2 and 3.

First, the drive shaft 7 is pressed into the center hole 2b of the rotor 2. At this time, it is not always necessary to heat the rotor 2.

After that, a cylindrical caulking punch 31 is applied to the bottom portions 13a of the plurality of vane grooves 13 on the end surface of the rotor 2 to give a hit. In this way, the rotor 2 is caulked to fix the rotor 2 to the drive shaft 7.

As described above, the caulking punch 31 has a cylindrical shape, and the caulking punch 31 is brought into contact with the bottom portion 13a of the vane groove 13 on the end surface of the rotor 2 by crimping the caulking punch 31.
Since the rear end is hit, the annular intermediate pressure supply groove 30 communicating with the bottom portion 13a of each vane groove 13 is formed on the end surface of the rotor 2.

Next, the operation of this vane type compressor will be described.

The rotational power of the engine (not shown) is driven by the drive shaft 7.
, The rotor 2 rotates. The refrigerant gas from the outlet of the evaporator (not shown) flows into the suction chamber 11 through the suction port 6a. The refrigerant gas in the suction chamber 11 is sucked into the compression space 12 through the suction port 12a. The compression space 12 is partitioned by the vanes 14 to form five compression chambers. Since the volume of each compression chamber changes as the rotor 2 rotates, the refrigerant gas trapped between the vanes 14 is compressed. The compressed and compressed refrigerant gas flows from the discharge port 16 through the discharge valve 19 into the discharge chamber 10, and the discharge port 5
It is discharged from a.

In the intermediate pressure supply groove 30 on the front side, a rear side block is formed in the intermediate pressure supply groove 30 on the rear side through a gap between the rear side end surface of the front side block 3 and the front side end surface of the rotor. Refrigerant and lubricating oil are respectively fed through the gap between the front end surface of No. 4 and the rear end surface of the rotor. The refrigerant and the lubricating oil sent to the intermediate pressure supply groove 30 are sent to the bottom portion 13 a of the vane groove 13. Therefore, the vane 14 smoothly projects from the vane groove 13.

According to the vane type compressor of this embodiment,
Since the intermediate pressure supply groove 30 for feeding the refrigerant and the lubricating oil to the bottom portion 13a of the vane groove 13 is provided on both end surfaces of the rotor 2 and the intermediate pressure supply grooves of both side blocks 3 and 4 are unnecessary, the drive shaft 7 is supported. The bearings 8 and 9 can be brought close to the rotor 2, respectively, and the resonance point of the drive shaft 7 can be raised to prevent abnormal noise from being generated due to abrasion of the drive shaft 7.

According to the rotor fixing method for the vane type compressor of this embodiment, the drive shaft 7 is attached to the center hole 2 of the rotor 2.
When press-fitting into b, it is not necessary to preheat the rotor 2, so that the knurled portion 7a of the drive shaft 7 is fixed to the inner peripheral surface of the center hole 2b of the rotor 2 over the entire circumference without any deviation. The strength of the rotor 2 is improved, and it is possible to prevent the rotor 2 from being damaged due to cracking from the bottom portion 13a of the vane groove 13, for example.

Further, the tip of the cylindrical caulking punch 31 is brought into contact with the bottom portion 13a of the vane groove 13 on the end face of the rotor 2, and the rear end of the caulking punch 31 is hit to caulk the rotor 2 so that the rotor 2 is formed. Since it is fixed to the drive shaft 7,
An annular intermediate pressure supply groove 30 communicating with the bottom portion 13a of each vane groove 13 is formed on the end surface of the rotor 2, and the fixing of the rotor 2 and the processing of the intermediate pressure supply groove 30 can be performed in one step.

FIG. 5 is a sectional view for explaining a method for fixing a rotor of a vane type compressor according to another embodiment of the present invention,
FIG. 6 is a view showing an end surface of the rotor of FIG. Portions common to the above-described embodiments are denoted by the same reference numerals, and description thereof is omitted.

In this embodiment, the central hole 2a of the rotor 2 is
Before press-fitting the drive shaft 57 into the shaft, the recesses 50a, 50b are provided at the outer peripheral surface of the drive shaft 57 at a position where the rotor 2 is fixed.
Was added. The recesses 50a and 50b are located at positions displaced by 180 degrees in the circumferential direction.

According to the rotor fixing method of this embodiment, the bottom portions 13a of the plurality of vane grooves 13 on the end surface of the rotor 2 are formed.
When the cylindrical caulking punch 31 is applied to the above and is hit, as shown in FIGS.
Since the rotor 2 enters the shafts 0a and 50b, the rotor 2 is more firmly fixed to the drive shaft 57, the strength of the rotor 2 is further improved, and the idling of the rotor can be prevented.

In each of the above-described embodiments, the case where the caulking punch has a cylindrical shape has been described, but an intermediate pressure supply groove for communicating all or part of the bottom portion 13a of the vane groove 13 can be formed. It is not limited to a cylindrical shape as long as it is a caulking punch.

[0042]

As described above, according to the vane type compressor of the first aspect of the present invention, since the pressure supply groove communicating with the bottom of the vane groove is provided on the end surface of the rotor, the pressure supply is applied to both side members. Since it is not necessary to provide a groove, the bearings supporting both ends of the drive shaft can be arranged at positions close to the rotor, and the resonance point of the drive shaft can be raised.

According to the vane type compressor of the second aspect of the present invention, since the rotor is not heated when the drive shaft is press-fitted into the center hole of the rotor, the inner peripheral surface of the rotor is entirely surrounded by the knurled portion of the drive shaft. Thus, it is possible to prevent the rotor from being damaged due to the fact that the rotor is improved in strength and the strength of the rotor is improved.

Further, the tip of the caulking punch is brought into contact with the bottom of the vane groove on the end face of the rotor, and the rear end of the caulking punch is hit to caulk the rotor so that the rotor is fixed to the drive shaft. A pressure supply groove that communicates with the bottom of each vane groove is formed on the end surface, and the fixing of the rotor and the processing of the pressure supply groove can be performed in one step, which improves workability.

According to the vane type compressor of the third aspect of the present invention, when the cylindrical caulking punch is applied to the bottoms of the plurality of vane grooves on the end surface of the rotor to strike, a part of the rotor is driven. Since the rotor enters the recess of the shaft, the rotor is more firmly fixed to the drive shaft, and the strength of the rotor is further improved.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view of a vane type compressor according to one embodiment of the present invention.

FIG. 2 is a cross-sectional view for explaining a method for fixing the rotor of the vane compressor according to the embodiment of the present invention.

FIG. 3 is a diagram showing an end surface of a rotor.

FIG. 4 is a diagram showing a front end surface of a rear side block.

FIG. 5 is a cross-sectional view for explaining a rotor fixing method for a vane compressor according to another embodiment of the present invention.

FIG. 6 is a diagram showing an end surface of a rotor.

FIG. 7 is a vertical cross-sectional view of a conventional vane compressor.

FIG. 8 is a diagram showing an end surface of a rotor.

FIG. 9 is a view showing a front end face of a rear side block.

[Explanation of symbols]

 1 cam ring 2 rotor 3 front side block 4 rear side block 5 front head 6 rear head 7,57 drive shaft 8,9 bearing 13 vane groove 13a vane groove 20 rear side member 25 front side member 30 intermediate pressure supply groove 31 caulking punch 50a, 50b recessed portion

Claims (3)

[Claims] 1. A rotor fixed to a drive shaft and rotatably housed in a cam ring; a first side member fixed to one side of the cam ring and rotatably supporting one end of the drive shaft; A second side member that is fixed to the other side of the cam ring and rotatably supports the other end of the drive shaft; a plurality of vane grooves provided in the rotor substantially in the radial direction; A vane compressor provided with a vane slidably inserted, wherein a pressure supply groove communicating with the bottom of the vane groove is provided on an end surface of the rotor. 2. A drive shaft is press-fitted into a center hole of a rotor, a cylindrical caulking punch is applied to the bottoms of a plurality of vane grooves on an end surface of the rotor to strike the rotor, and the rotor is caulked and fixed to the drive shaft. A method for fixing a rotor of a vane compressor, comprising: 3. A recess is provided on the outer peripheral surface of the drive shaft at a position where the rotor is fixed, before the drive shaft is press-fitted into the center hole of the rotor. Method for fixing rotor of vane type compressor.