JP2852623B2 - Gas compressor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas compressor used for a car air conditioner and the like, and is particularly suitable for improving the strength of an aluminum rotor.

[0002]

2. Description of the Related Art Conventionally, as a lightweight gas compressor of this type, for example, as shown in FIG.
An aluminum rotor 2 (hereinafter, referred to as an aluminum rotor) having a circular cross section is rotatably housed therein, and the aluminum rotor 2 is provided with a steel shaft 3 through a through hole 2a penetrating both end surfaces thereof. (Hereinafter, referred to as an iron shaft).

When the aluminum rotor 2 and the iron shaft 3 are integrated, the iron shaft 3 is inserted into the through hole 2a of the aluminum rotor 2 as shown in FIG. Pressing is performed by the die 100, whereby a part of the aluminum rotor 2 is plastically flown into the outer peripheral groove 3a of the iron shaft 3, and the aluminum rotor 2 and the iron shaft 3 are fastened through the plastic flow part A.

For this reason, the position and shape of the end face 2b of the aluminum rotor 2 and the outer peripheral groove 3a of the iron shaft 3 are important, and a part of the plastically flowed aluminum rotor 2 is transferred to the outer peripheral groove 3a of the iron shaft 3. To obtain high fastening strength between the aluminum rotor 2 and the iron shaft 3 by filling
It is optimal to provide the position of the iron shaft 3 and its shape as shown in FIG.

After the aluminum rotor 2 and the iron shaft 3 are fastened to each other as described above, the aluminum rotor 2 is subjected to machining such as cutting and grinding on the end face 2b to obtain a desired surface as shown in FIG. Form into shape.

As shown in FIG. 4, the cylinder 1 is disposed between a pair of side blocks 4 and 4, and the pair of side blocks 4 and 4 are attached to end surfaces of the cylinder 1, respectively. 3 is the side block 4, 4
Are supported by the bearing portions 5, 5.

Further, as shown in FIG.
Are formed in the radial direction thereof, and vanes 7, 7,... Are mounted in the vane grooves 6, 6, and the vanes 7, 7,. It is provided so as to be able to protrude and retract toward the inner wall and is urged against the inner wall of the cylinder 1. This kind of urging force is caused by centrifugal force due to rotation of the aluminum rotor 2 and back pressure of lubricating oil supplied to the vane grooves 6, 6. Is obtained by

In such a gas compressor, the iron shaft 3 rotates, and this rotational torque is transmitted to the aluminum rotor 2, and when the aluminum rotor 2 rotates, the cylinder 1, the aluminum rotor 2, a pair of side blocks 4, 4 and the capacity of the compression working chambers 8, 8, ... divided by the vanes 7, 7, ..., thereby compress the refrigerant gas in the suction chamber 9 and discharge it to the discharge chamber 10.

[0009]

However, in the conventional gas compressor as described above, after the aluminum rotor 2 and the iron shaft 3 are fastened, the end face 2b of the aluminum rotor 2 is closed.
When the aluminum rotor 2 is formed into a shape as shown in FIG. 6 (b) by machining, the plastic flow portion A has an extremely thin portion, which causes a problem such as a decrease in the strength of the aluminum rotor 2. There is a point.

The outer circumferential groove 3a of the iron shaft 3
As described above, the position and shape of the shaft are uniquely determined from the viewpoint of plastic flow, and changing them while ignoring the plastic flow causes a decrease in the fastening strength between the aluminum rotor 2 and the iron shaft 3. Therefore, the outer peripheral groove 3a cannot be provided at a position where a thin portion cannot be formed in the plastic flow portion A, or the outer peripheral groove 3a cannot be formed in a shape where a thin portion cannot be formed in the plastic flow portion A.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a gas compressor suitable for improving the strength of an aluminum rotor.

[0012]

To achieve the above object, according to the solution to ## invention of claim 1, wherein, and rotatably accommodated a pair of side blocks, cylinder disposed between the two side blocks, in the cylinder rotor , from the outer peripheral surface of the rotor
Retractable vane towards the inner wall of the cylinder, and includes a compression working chamber which is partitioned by these, in the gas compressor for compressing a refrigerant gas in a volume change of the compression working chamber due to the rotation of the low <br/> data , The rotor and the rotor
For fastening the shaft for transmitting the rotational torque
The rotor corresponding to the opening periphery of the through hole of the rotor
By pressurizing the end face with a die and plastically deforming it,
Plastic flow of part of the rotor into the outer circumferential groove of the shaft
To form a plastic flow part, and pressurized and deformed by the die
Machined and machined such as cutting and grinding
When the plastic flow part can be reinforced as much as possible,
Work so that it becomes a tapered part that spreads to the end face side of the rotor.
Characterized in that the reinforcing portion is formed .

According to a second aspect of the present invention , an end face of the rotor is provided.
The tapered portion expanding to the side has an arc shape .

According to a third aspect of the present invention , an end face of the rotor is provided.
The tapered portion expanding to the side protrudes from the end face of the rotor.
It is characterized by comprising a step provided so that it may be.

[0015]

[0016]

According to the present invention, since the plastic flow portion is reinforced by the reinforcing portion, in particular, the problem of the aluminum rotor that is fastened to the iron shaft through this type of plastic flow portion, that is, the aluminum flow from the plastic flow portion to the aluminum rotor. Can be prevented from being damaged.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a gas compressor according to the present invention will be described below in detail with reference to FIGS.

It is to be noted that a basic configuration of the gas compressor is provided, for example, to include a pair of side blocks 4, 4, a cylinder 1, an aluminum rotor 2, and compression working chambers 8, 8, ... partitioned by vanes 7, 7, .... , And the compression of the refrigerant gas by the change of the capacity of the compression working chambers 8, 8,... Due to the rotation of the rotor 2 is the same as in the prior art.

As shown in FIG. 1, this gas compressor is provided with a tapered portion 11 as a reinforcing portion on the end face 2b side of the aluminum rotor 2.

The tapered portion 11 is a through hole 2 of the aluminum rotor 2.
a, the aluminum rotor 2 and the iron shaft 3
Are formed integrally with the plastic flow portion A, which reinforces the plastic flow portion A.

The tapered portion 11 is provided so as to maximize the expansion on the end face 2b side of the aluminum rotor 2.

In order to form the tapered portion 11 as described above, first, a part of the aluminum rotor 2 is plastically flowed into the outer circumferential groove 3a of the iron shaft 3, and the aluminum rotor 2 and the iron rotor 2 are formed through the plastic flow portion A. fastening the shaft 3 (see FIG. 6 (a)). Thereafter, when machining such as cutting is performed on the end face 2 b of the aluminum rotor 2, the boundary between the end face 2 b of the aluminum rotor 2 and the iron shaft 3, that is, the peripheral edge of the through hole 2 a may be left as the tapered portion 11.

Next, the operation of the gas compressor configured as described above will be described with reference to FIG.

According to this gas compressor, the compression force is applied to the aluminum rotor 2 when compressing the refrigerant gas by changing the capacity of the compression working chambers 8, 8... Since the plastic flow portion A is reinforced by the tapered portion 11, the aluminum rotor can be prevented from being damaged from the plastic flow portion A, and the gas compressor using the aluminum rotor 2 can be operated for a long time.

Therefore, according to the gas compressor of the above embodiment, the plastic flow portion A is reinforced by the tapered portion 11, thereby preventing the aluminum rotor 2 from being damaged from the plastic flow portion A. The strength of the aluminum rotor 2 is high and the durability is excellent.

In the above embodiment, the reinforcing portion is formed by the tapered portion 1.
1, the reinforcing portion may be configured as a circular arc portion 12 as shown in FIG. 2 or a step portion 13 as shown in FIG. At this time, the circular arc portion 12 is provided so as to maximize the spread on the end face side of the aluminum rotor 2 like the tapered portion 11, and the step portion 13 is provided so as to protrude from the end face of the aluminum rotor 2. Even in the reinforcing portion including the arc portion 12 and the step portion 13, the same effect as that of the tapered portion 11, that is, the durability of the aluminum rotor 2 can be improved.

[0027]

In the gas compressor according to the present invention,
As described above, since the reinforcing portion is provided in the plastic flow portion on the rotor end surface side for fastening the rotor and the shaft transmitting the rotational torque to the rotor, the plastic flow portion is reinforced by the reinforcing portion. It is possible to prevent the problem of the aluminum rotor that is fastened to the iron shaft via the portion, that is, to prevent the aluminum rotor from being damaged from the plastic flow portion, and it is suitable for improving the strength of the aluminum rotor.

[0028]

[Brief description of the drawings]

FIG. 1 is a sectional view showing a main part of a gas compressor according to the present invention.

FIG. 2 is a sectional view showing another embodiment of the present invention.

FIG. 3 is a sectional view showing another embodiment of the present invention.

FIG. 4 is a sectional view of a conventional gas compressor.

FIG. 5 is a sectional view taken along line III-III of FIG. 4 ;

FIG. 6 is an explanatory diagram of a fastening portion between a rotor and a shaft of the gas compressor shown in FIG. 4 ;

[Explanation of symbols]

 A plastic flow section 1 cylinder 2 rotor 3 shaft 4 side block 7 vane 8 compression working chamber 11 taper section 12 arc section 13 step section

Continuation of the front page (56) References JP-A-5-33788 (JP, A) JP-A-63-268525 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) F04C 18 / 30-18/352 F04C 2/30-2/352 F04C 29/00-29/10 B21D 39/04

Claims (3)

(57) [Claims] 1. A pair of side blocks, cylinder disposed between the two side blocks, rotor rotatably housed in the cylinder, the rotor outer circumferential surface retractably toward the inner wall of the cylinder from the vane, and includes a compression working chamber which is partitioned by these, in the gas compressor for compressing a refrigerant gas in a volume change of the compression working chamber due to the rotation of the rotor, in order to transmit and the rotor, the rotational torque to the rotor
To open the through hole of the rotor
Press the end face of the rotor corresponding to the peripheral edge of the rotor with a die to
The upper part of the shaft is deformed by
A part of the rotor plastically flows to form a plastic flow part,
Cutting and grinding on the pressurized deformed part with the die
When removing by machining such as
The tape can be reinforced as much as possible, and it extends to the end face of the rotor.
A gas compressor characterized by having a reinforcing portion processed so as to be a tapered portion . 2. The taper extending toward the end face of the rotor.
The gas compressor according to claim 1, wherein the portion has an arc shape . 3. The taper expanding toward the end face of the rotor.
The gas compressor according to claim 1, wherein the portion comprises a step portion provided so as to protrude from an end face of the rotor .