Metal deforming – By use of closed-die and coacting work-forcer – Forcing work into or within closed die; e.g. – forging
Patent
1981-11-27
1985-04-23
Larson, Lowell A.
Metal deforming
By use of closed-die and coacting work-forcer
Forcing work into or within closed die; e.g., forging
72377, B21J 1302
Patent
active
045121753
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a swash plate type compressor shoe and a method for manufacturing the same. More particularly, the present invention relates to a swash plate type compressor shoe which is interposed between a swash plate rotated by a rotating shaft in a cylinder block and a piston slidably fitted inside the cylinder block and which converts the rotary movement of the swash plate to the reciprocal movement of the piston, and to a method for manufacturing a shoe of this type.
BACKGROUND ART
A swash plate type compressor shoe has a swash plate which is rotated by a rotating shaft in a cylinder block and a piston which is slidably fitted inside the cylinder block. Conventionally, in order to convert the rotary movement of the swash plate to the reciprocal movement of the piston, a shoe with a hemispherical recess is brought into slidable contact with the swash plate, and a ball is interposed in the hemispherical recess between the shoe and the swash plate. However, when both the shoe and the ball are used, the assembly procedure becomes complex. In addition to this, since the shoe and the ball are in slidable contact with each other and the ball and the piston are also in slidable contact with each other, much power is consumed by friction between these members. It is also difficult to make the overall length small in the axial direction of the shoe and the ball, resulting in a great length of the cylinder block in the axial direction. A compact swash plate type compressor has therefore been difficult to manufacture.
It is therefore an object of the present invention to provide a swash plate type compressor shoe wherein the assembly procedure is simple, the power loss due to friction is reduced to the minimum, and the axial length of the cylinder block is shortened so that the compressor may be compact in size.
It is another object of the present invention to provide a method for manufacturing by plastic deformation, a shoe of the type as described above, which does not require a shoe element of good precision conforming to the shape of a press die and which still guarantees a shoe of excellent shape.
It is still another object of the present invention to provide a method for manufacturing a shoe of the type described above, which allows a uniform load to act upon the shoe element and reduces the flow of the material during the plastic deformation, and which allows smooth processing.
DISCLOSURE OF INVENTION
The present invention is characterized in that a hemispherical part is formed in a shoe, and this hemispherical part is directly brought into slidable contact with a hemispherical recess of the piston without incorporating a ball. By forming a hemispherical part on the shoe itself and bringing it into slidable contact with the hemispherical recess of the piston, the assembly of the swash plate type compressor becomes easy, the power consumption is reduced, and the overall length of the compressor is shortened.
According to an aspect of the method of the present invention, for compressing a columnar element in its axial direction for causing plastic deformation, one end of the columnar element is subjected to plastic deformation at the inner surface of the hemispherical recess of a die while the other end of it is urged against a flat end face of another die, so that a flank part may be formed between the hemispherical part slidably contacting the hemispherical recess of the piston and the bottom end face which is in slidable contact with the swash plate.
According to another aspect of the method of the present invention, a hole of a predetermined size is formed at the end face of the columnar element as the shoe element, and the opening side of the hole is reduced in diameter by pressing the periphery of the end face, thereby forming a hemispherical part having an opening at the top.
According to still another aspect of the method of the present invention, the periphery of the end face of the columnar element is cut into a conical shape, and this conical part is press
REFERENCES:
patent: 329284 (1885-10-01), Dalzell
patent: 1568031 (1925-12-01), Wilcox
patent: 1655156 (1928-01-01), Muir
patent: 2014702 (1935-09-01), Sherman
patent: 3996806 (1976-12-01), Alexander
patent: 4037522 (1977-07-01), Inoshita et al.
Kaku Yoshihiro
Otsu Keiichiro
Larson Lowell A.
Taiho Kogyo Co. Ltd.
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