JPH0419362B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an Oldham ring used in an orbiting scroll anti-rotation mechanism of a scroll fluid device.

As shown in Fig. 1, the structure of the scroll fluid device consists of a fixed scroll 1, an orbiting scroll 2, an anti-rotation mechanism 3, a frame 4, and a drive mechanism. Among these, the anti-rotation mechanism 3
is for rotating the orbiting scroll 2 without rotating while preventing the rotation of the orbiting scroll 2. Keys 2a, 2a are press-fitted and fixed in a straight line on the back surface of the orbiting scroll 2.
are slidably fitted into the key grooves 6a, 6a provided on the upper surface of the Oldham ring 6 at a position facing this, and the key groove 6 is fitted on the opposite surface of the Oldham ring 6.
Similar key grooves 6b, 6 at positions orthogonal to a, 6a
b, and protrusions 5, 5 are provided in the frame 4 in the radial direction at positions opposite to the protrusions 5, 5.
The keys 5a, 5a, which are press-fitted and fixed on the top, are slid into the key grooves 6b, 6b, and the Oldham ring 6
The structure is such that the orbiting scroll can be slid in the direction of the key grooves 6b, 6b, thereby preventing the orbiting scroll from rotating while making an orbiting motion.

7 is the stator of the motor, which is fixed to the chamber 8; 9 is the rotor of the motor, to which the crankshaft 10 is fixed in the center;
It is rotatably supported. 12 is the suction pipe, 1
3 is a discharge pipe. The discharge pipe 13 is communicated with the inside of the chamber 8 through a pipe 14. 15 is another discharge pipe.

The Oldham ring used in the orbiting scroll anti-rotation mechanism of the scroll fluid device described above requires machining of the inner and outer peripheral surfaces, upper and lower surfaces, and each keyway of a single ring member formed by forging or casting. In many cases, the cost was high.

The present invention has been made in view of the above points, and an object of the present invention is to provide an Oldham ring for a scroll fluid device that can be constructed from a single ring member without cutting.

In order to achieve the above object, the Oldham ring for a scroll fluid device according to the present invention has two keys on the orbiting scroll side provided at opposite positions on the diametrical line on the back surface of the end plate of the orbiting scroll in the scroll fluid device, and two keys perpendicular to the keys. The two keys on the frame side, which are provided at diametrically opposed positions on the frame, which is a stationary member, slide into each pair of key grooves provided orthogonally to each other on the front and back surfaces of the fully circular ring member. In the Oldham ring as a rotation prevention member of an orbiting scroll which is made to fit together, the Oldham ring is made of a plurality of divided members of the same shape and fixed to each other by welding or the like to form a fully circular ring member, In addition, when constructing the fully circular ring member, key grooves into which two keys on the orbiting scroll side are slidably fitted are formed on the surface of the ring member, and two keys on the frame side are formed on the back surface of the ring member. The present invention is characterized in that a key groove is formed into which each key is slidably fitted.

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

4 to 7 show the first embodiment,
In the Oldham ring according to this embodiment, the plurality of divided members of the same shape are four flat plate-shaped substantially semicircular ring members, and these substantially semicircular ring members are arranged in two pieces on the front side and two pieces on the back side, each having a keyway width. They are assembled and fixed to each other at a considerable distance, and key grooves orthogonal to each other are formed on the front and back surfaces of the entire circular ring member. That is, in the figure, 16 is a semicircular arc-shaped member, and as shown in FIG.
As shown in Fig. 6, the members are shifted by 90 degrees and fixed by welding or the like, with the width between the end faces of each member being set as a. By doing so, the yield of the material can be improved, and the number of processing steps can be greatly reduced, thereby improving productivity.

FIGS. 8 to 11 show a second embodiment, and in the Oldham ring according to this embodiment, a plurality of divided members of the same shape are arranged in the central part of a flat plate-shaped substantially semicircular ring member with a keyway width. These are four approximately semicircular ring press-molded members that are press-formed by the thickness of the member, two of the press-molded members on the front side and two on the back side, each of which is equal to the width of the keyway plus the thickness of the member. The ring members are assembled and fixed to each other at intervals, and key grooves orthogonal to each other are formed on the front and back surfaces of the entire circular ring member. That is, the Oldham ring 17 is composed of four members 17 having a semicircular arc shape, grooves 17a and 17b are press-molded in the center of the members, and a convex portion having a width b is formed on the opposite surface, and the semicircular arc shape is formed. The end face of the ring is formed to a dimension b/2 from the center, and these members are combined and welded together as shown in Figs. 9, 10 and 11 to form an Oldham ring, similar to the first embodiment. It is effective.

FIGS. 12 to 14 show a third embodiment, and in the Oldham ring according to this embodiment, a plurality of divided members of the same shape have a keyway width on the diameter line of a flat plate-like almost entirely circular ring member. It is two fully circular ring press molded members that are press molded by the height of the key groove.The two fully circular ring press molded members are combined and fixed to each other, and the front and back surfaces of the fully circular ring member It is configured such that key grooves are formed orthogonal to each other. That is, key grooves 18a and 18b were press-formed on a ring-shaped disc 18 so as to face each other on a straight line passing through the center of the circle, and the ring was formed by shifting these members 90 degrees and fixing them by back-to-front welding or the like. In addition to the same effects as those of the first and second embodiments, it also has the effect of reducing weight, reducing inertia generated by reciprocating motion, and reducing vibration. It is also possible to increase the rigidity by pressing ribs at appropriate locations on the member.

Since the present invention is configured as described above, the Oldham ring can be formed by a combination of a plurality of press-molded members of the same shape made from a punched flat plate,
Compared to the previous method in which the upper and lower surfaces and grooves were cut by machining, manufacturing is easier, the yield is lower, and by eliminating cutting parts, costs can be reduced and productivity can be increased.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view of a conventional structure, FIG. 2 is a bottom view of the orbiting scroll, and FIG. 3 is a top view of the Oldham ring. FIGS. 4 to 7 show the first embodiment of the present invention.
4 is a plan view of the Oldham ring parts, FIG. 5 is a plan view after assembly, FIG. 6 is a side view of the same, and FIG. 7 is a perspective view of the same. 8 to 11 show a second embodiment of the present invention, in which FIG. 8 is a plan view of the Oldham ring parts, FIG. 9 is a plan view after assembly, FIG. 10 is a side view of the same, and FIG. FIG. 11 is a perspective view of the same. 12 to 14 show a third embodiment of the present invention, in which FIG. 12 is a plan view of the Oldham ring parts, FIG. 13 is a side view after assembly, and FIG. 14 is a perspective view thereof. . 1...Fixed scroll, 2...Orbiting scroll, 3...Rotation prevention mechanism, 4...Frame, 5...
...Key, 6...Oldham ring, 6a, 6b...
Keyway, 7...Stator, 8...Chamber, 9...
...Rotor, 10...Crankshaft, 11...Bearing,
12... Suction pipe, 13... Discharge pipe, 14... Piping, 15... Discharge pipe, 16... Member, 16a, 1
6b...Groove, 17...Oldham ring, 17a,
17b...groove, 18...disc.

Claims (1)

[Scope of Claims] 1. Two keys on the orbiting scroll side provided at diametrically opposed positions on the back surface of the orbiting scroll end plate in a scroll fluid device, and diametrically opposed positions of a frame, which is a stationary member, orthogonal thereto. A system for preventing rotation of an orbiting scroll in which two keys on the frame side provided on the frame are slidably fitted into each pair of key grooves provided perpendicularly to each other on the front and back surfaces of a circular ring member. In the Oldham ring as a member, the Oldham ring is made of a plurality of divided members of the same shape and fixed to each other by combination welding or the like to constitute a fully circular ring member, and when constructing the fully circular ring member, In addition, a key groove is formed on the surface of the ring member into which the two keys on the orbiting scroll side are to be slidably fitted, and on the back surface thereof, two keys on the frame side are to be slidably fitted. An Oldham ring for a scroll fluid device, characterized in that a keyway is formed. 2 The plurality of divided members of the same shape are four flat plate-like substantially semicircular ring members, and these substantially semicircular ring members are assembled, two on the front side and two on the back, with an interval equivalent to the width of the keyway. The Oldham ring for a scroll fluid device according to claim 1, characterized in that the ring members are mated and fixed together, and key grooves orthogonal to each other are formed on the front and back surfaces of the fully circular ring members. 3 The plurality of divided circular members are four approximately semicircular ring press-molded members formed by press-molding the center portion of a flat approximately semicircular ring member with the width of the key groove removed and the thickness of the member. Two of the press-formed members on the front side and two pieces on the back side are assembled and fixed with an interval equal to the width of the keyway plus the thickness of the member, and keyways that are orthogonal to each other are formed on the front and back surfaces of the fully circular ring member. The Oldham ring for a scroll fluid device according to claim 1, characterized in that the Oldham ring is formed in the following manner. 4. The plurality of divided members of the same shape are two fully circular ring press-molded members formed by taking the keyway width on the diameter line of a flat plate-like almost fully circular ring member and press-forming by the height of the keyway. Claim 1, characterized in that the two fully circular ring press molded members are combined and fixed to each other, and key grooves orthogonal to each other are formed on the front and back surfaces of the fully circular ring member. Oldham ring for a scroll fluid device as described in .