Expansible chamber devices – Displacement control of plural cylinders arranged in... – Parallel cylinders
Reexamination Certificate
1999-04-15
2001-11-20
Nguyen, Hoang (Department: 3748)
Expansible chamber devices
Displacement control of plural cylinders arranged in...
Parallel cylinders
C092S057000, C092S071000, C092S255000, C092S260000, C417S269000
Reexamination Certificate
active
06318236
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates in general to a compressor and more particularly to a reciprocal motion type compressor generally and widely used for automotive vehicles, cars and the like.
A conventional reciprocal motion type compressor comprises a cylinder block defining a cylinder bore extending in an axial direction of the compressor. A piston is placed in the cylinder bore to be movable in the axial direction. The piston is reciprocally driven in the axial direction through a driving mechanism by an engine mounted on, for example, an automobile.
In the conventional reciprocal motion type compressor, the piston comprises a body member and a cover member coupled to the body member. The body member has a hollow portion at a rear portion thereof. The cover member has an insertion portion inserted into the hollow portion of the body member. After the insertion portion is inserted into the hollow portion, the body member and the cover member are fixed together by, for example, an electronic beam welding technique to form a coupling portion.
In the piston, there is a serious problem in mechanical strength in the coupling portion between the body member and the cover member in the axial direction. That is, the strength in the coupling portion is rather weak in the conventional structure. Therefore, the coupling portion has less durability relative to a repeated reciprocal movement of the compressor, particularly in a high speed operation of the compressor.
SUMMARY OF THE INVENTION
It is therefore an object of the present invention to provide a new and improved compressor, particularly in a swash plate type compressor, which has an improved, increased tensile strength in a piston structure in an axial direction.
Other objects of the present invention will become clear as the description proceeds.
According to an aspect of the present invention, there is provided a reciprocal motion type compressor which comprises a cylinder block defining a cylinder bore extending in an axial direction of the compressor, a piston placed in the cylinder bore and movable in the axial direction, and driving means for reciprocally driving the piston in the axial direction. The piston comprises a body member having a front portion and a rear portion which are opposite to each other in the axial direction. The front portion is coupled to the driving means. The rear portion has a rear surface and a hollow portion extending from the rear surface in the axial direction. The piston further comprises a cover member coupled to the rear portion of the body member to close the hollow portion. The cover member comprises a plate portion fixed to the rear surface of the body member in the axial direction and a flange formed integral with the plate portion and inserted into the hollow portion of the body member for reinforcing the plate portion.
According to another aspect of the present invention, there is provided a reciprocal motion type compressor comprising a piston reciprocally movable in a cylinder bore. In the compressor, the piston has a cover member and a body member fixed to each other. The cover member has an insertion portion engaged with a rear section of the body member. The insertion portion has a sectional area becoming smaller gradually from a rear end of the insertion portion towards a front end thereof.
According to still another aspect of the present invention, there is provided a reciprocal motion type compressor which comprises a cylinder block defining a cylinder bore extending in an axial direction of the compressor, a piston placed in the cylinder bore and movable in the axial direction, and driving means for reciprocally driving the piston in the axial direction. The piston comprises a body member having a front portion and a rear portion which are opposite to each other in the axial direction. The front portion is coupled to the driving means. The rear portion has a rear surface and a hollow portion extending from the rear surface in the axial direction. The piston further comprises a cover member coupled to the rear portion of the body member and comprising a fitting portion substantially closely fitted into the hollow portion of the body member. The fitting portion comprises a front section having a first sectional area and a rear section having a second sectional area which is greater than the first sectional area.
REFERENCES:
patent: 2246942 (1941-06-01), Janney et al.
patent: 5174728 (1992-12-01), Kimura et al.
patent: 5265331 (1993-11-01), Engel et al.
patent: 5630353 (1997-05-01), Mittlefehldt et al.
patent: 5765464 (1998-06-01), Morita
patent: 10-159725 (1998-06-01), None
Miyazawa Kiyoshi
Morita Yujiro
Baker & Botts L.L.P.
Nguyen Hoang
Sanden Corporation
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