JPH05296162A - Oldham's ring - Google Patents

Abstract

PURPOSE:To secure smooth sliding motion so as to reduce the load of thrust load and dispense with special thrust load bearing by disposing rollers in the protruding parts of an Oldham's ring, and forming ball receiving parts on the upper and lower faces of the Oldham's ring. CONSTITUTION:An Oldham's ring 1 is disposed on the back face of a turning scroll body in a scroll compressor. In this case, a roller insert part 11 wider than the width of a roller 3 is cut in the center part of each of vertical protruding parts 2 in the Oldham's ring 1, and a roller support part 12 is formed at the inner center part so as to insert-support the roller 3 therein. The face of the Oldham's ring 1 is thereby prevented from coming in contact with a frame 7 and a turning scroll bottom plate 10, and smooth sliding motion can be secured by the roller 3. Four places corresponding to the 45 deg. position relation to the protruding parts 2 are formed into circles wider than the width of the Oldham's ring 1, and ball receiving parts 4 of the specified depth are formed at the upper and lower faces of these circles so as to support balls 5 therein.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an Oldham ring for preventing the orbiting scroll body of a scroll type compressor used in an air conditioner, a refrigeration system or the like from rotating.

[0002]

2. Description of the Related Art In a scroll type compressor, a fixed scroll body and an orbiting scroll body are engaged with each other by shifting an angle so that a fixed scroll body has a certain eccentricity and a rotating scroll body. The rotary body is swung to perform compression in a plurality of compression chambers formed between the two scroll bodies. As a feature, the fluctuation of the compression torque due to the rotation angle is extremely small compared to other compressors. Since the compression stroke is continuous and the pressure difference between adjacent compression chambers is small,
The amount of squeeze is small and the efficiency can be improved by 10% or more as compared with other compressors. Further, since the sliding speed is low, high-speed rotation is possible and the compression member can be easily downsized.

Here, it is necessary to prevent the rotation of the orbiting scroll body in the orbiting motion, and an Oldham ring is widely used as a rotation preventing mechanism.
A conventional Oldham ring will be described with reference to FIGS. The ring 1 having a quadrangular cross section has two sets of key-shaped protrusions 2 which are orthogonal to each other on the upper and lower faces thereof, and the protrusions 2 on the lower face of the ring rotate in the key grooves 8a of the frame 7, and similarly the protrusions on the upper face rotate. Orbiting scroll bottom plate 1 of scroll body 9
It is fitted in the key groove 8b on the back surface of 0 respectively. Protrusion 2
Moves in the direction of the key groove 8a with respect to the frame 7,
The orbiting scroll body 9 on the upper surface is formed with a key groove 8b orthogonal to it.
It has a function of moving in the direction, and as a result, the orbiting scroll body 9 can be orbited while preventing rotation.

[0004]

However, the thrust load due to the compressed gas constantly acts on the orbiting scroll, and therefore the thrust load receiver is arranged. However, some thrust load also acts on the Oldham ring. In addition, a large amount of friction is generated due to the surface sliding. As a result, mechanical loss is increased, leading to a reduction in compressor efficiency.

[0005]

In order to solve the above problems, in an Oldham ring arranged on a revolving scroll of a scroll type compressor, rollers are arranged on all projections of the Oldham ring, and the Oldham ring is arranged. This is achieved by forming ball receiving portions on the upper and lower surfaces of the ring and arranging balls between the ball receiving portion and the ball receiving portions of the orbiting scroll body and the frame.

[0006]

EXAMPLE FIG. 1 shows the Oldham ring in the present invention.
2 will be described. 1 is a top view of the structure of the Oldham ring and the plate of the present invention, and FIG. 2 is a sectional view of the structure of the Oldham ring, the plate, and the orbiting scroll of the present invention taken along the line AOA 'in FIG.

A roller insertion portion 11 wider than the width of the roller portion of the roller 3 by 0.5 to 1 mm is cut in the center of the protrusion portion 2 above and below the ring 1, and the roller is supported at the center portion inside each of the divided protrusion portions. The part 12 is provided and the roller 3 is provided there.
Insert and support. The roller insertion portion 11 has a depth such that the top of the roller 3 protrudes from the tip of the protrusion 2 by about 0.5 to 1 mm. With such a structure, the surface of the ring 1 does not come into contact with the frame 7 and the orbiting scroll bottom plate 10, and the roller 3 does not cause smooth sliding and large friction. The ball receiving portion 4 having a depth on both upper and lower surfaces of the circular portion is formed by forming four portions, which are in a positional relationship of 45 degrees with the protruding portions 2 on the upper and lower surfaces of the ring 1, into a circle wider than the width of the ring 1.
To provide. A taper portion 6 is provided inside the ball receiving portion 4 so as to securely support the ball 5 and prevent damage. The ball receiving portion 4 is similarly provided on the orbiting scroll bottom plate 10 and the frame 7 arranged above and below the ring 1. Therefore, the two sets of ball receiving portions 4 facing each other vertically can reliably sandwich the ball 5. The ball 5 sandwiched between the ring 1 and the orbiting scroll body 9 rolls along the direction of the key groove 8b provided in the orbiting scroll bottom plate 10 in the ball receiving portion 4, while the ball 5 sandwiched between the ring 1 and the frame 7. 5 rolls along the direction of 8a provided on the frame 7. Here, all the balls 5 have the same diameter, and the diameter of each ball receiving portion 4 is a radius that allows the balls 5 to match the turning radius of the scroll body or roll a distance longer than the turning radius. The depth of each ball receiving portion 4 is such that the balls 5 are sandwiched between the upper and lower sides,
The depth is such that the crown of the roller 3 contacts or does not contact the facing surface of the groove 2. With such a configuration, more than half of the thrust load can be surely received by the ball 5, the pressing force of the thrust load on the roller 3 is reduced, friction is reduced, and the roller 3 can smoothly rotate.
Further, it is not necessary to provide a thrust load receiver separately.

As described above, the sliding friction is reduced by remarkably reducing the sliding portion on the surface, and as a result, the mechanical loss is remarkably reduced and the compressor efficiency can be improved. Also, by arranging the balls in the ball receiving portion of the Oldham ring to form the thrust load receiver, it is not necessary to separately arrange the thrust load receiver, and the structure can be made compact. Therefore, the orbiting scroll body can realize a smooth orbiting motion by surely preventing the rotation of the protrusion by the rotation and receiving most of the thrust load by the ball.

[0009]

In the Oldham ring arranged on the back surface of the orbiting scroll of the scroll type compressor, the rollers are arranged on all the projections of the Oldham ring, and the ball receiving portions are formed on the upper and lower surfaces of the Oldham ring. By forming
It is possible to secure smooth sliding and reduce the load of thrust load on the Oldham ring, resulting in a significant reduction in sliding friction, that is, mechanical loss, and improvement in compressor efficiency. Further, by providing the ball receiving portion arranged on the Oldham ring and arranging the balls there to form the thrust load receiver, it is not necessary to specially arrange the thrust load receiver, so that the structure can be made compact.

As described above, the orbiting scroll body is surely prevented from rotating by the protrusion of the Oldham ring, and can be smoothly orbited by receiving the thrust load from the ball.

[Brief description of drawings]

FIG. 1 is a structural top view of an Oldham ring and peripheral parts of the present invention.

FIG. 2 is a view of the Oldham ring of FIG. 1 and its peripheral parts.
AOA 'sectional drawing inside.

FIG. 3 is a structural top view of a conventional Oldham ring and peripheral parts.

FIG. 4 is a view of a conventional Oldham ring and peripheral parts.
AA 'sectional drawing inside.

[Explanation of symbols]

 1 ring 2 protrusion 3 roller 4 ball receiving part 5 ball 6 taper part 7 frame 8a key groove 8b key groove 9 orbiting scroll body 10 orbiting scroll bottom plate 11 roller insertion part 12 roller support part

Claims (1)

[Claims] 1. In an Oldham ring arranged on the back surface of a revolving scroll of a scroll compressor, rollers are arranged on all protrusions of the Oldham ring, and ball receiving portions are formed on the upper and lower surfaces of the Oldham ring. Oldham ring characterized by being formed.