Compressor pistons

• US 6,557,454 B2
• Filed: 06/11/2001
• Issued: 05/06/2003
• Est. Priority Date: 07/12/2000
• Status: Expired due to Fees

• Current Assignee: Sanden Corporation (Qingdao Huatong State-Owned Capital Operation (Group) Co., Ltd.)
• Original Assignee: Sanden Corporation (Qingdao Huatong State-Owned Capital Operation (Group) Co., Ltd.)
• Inventors: Miyazawa, Kiyoshi
• Primary Examiner(s): Look, Edward K.
• Assistant Examiner(s): LESLIE, MICHAEL S
• Application Number:
  US09/877,003
• Publication Number:
  US 20020005115A1
• Time in Patent Office: 694 Days
• Field of Search: 92/71, 921/72, 914/99
• US Class Current: 92/71
• CPC Class Codes: F04B 27/0878 Pistons

Abstract

A piston for use in a fluid displacement apparatus includes a head portion and a connecting portion. The head portion has a cylindrical shape and a hollow structure. The head portion comprises an end portion and a cylindrical portion. The end portion fixedly connected to the cylindrical portion. The connecting portion extends from an end surface of the cylindrical portion and couples the piston with a moving source. A pair of apertures are formed through the end surface of the cylindrical portion adjacent to connecting portion. A rib is formed between the pair of apertures. The strength of a circumference portion of the apertures may be increased by the rib. As a result, when the fluid displacement apparatus is operated under a high load, the occurrence of cracks at the circumference portion(s) of the aperture(s) may be reduced or eliminated.

Claims

1. A piston for use in a fluid displacement apparatus comprising:

a head portion having a cylindrical shape and a hollow structure;

a connecting portion extending from an end surface of said head portion and coupling said piston with a moving source; and

an aperture formed through said end surface of said head portion adjacent to said connecting portion,

wherein a rib is formed adjacent to said aperture.

2. The piston of claim 1, wherein said rib is formed on an inner surface of said head portion.

3. The piston of claim 1, wherein said rib is formed on an outer surface of said head portion.

4. The piston of claim 1, wherein said fluid displacement apparatus is a swash plate-type compressor.

5. A piston for use in a fluid displacement apparatus comprising:

a head portion having a cylindrical shape and a hollow structure, said head portion comprising an end portion and a cylindrical portion, said end portion fixedly connected to said cylindrical portion;

a connecting portion extending from an end surface of said cylindrical portion and coupling said piston with a moving source; and

a pair of apertures formed through said end surface of said cylindrical portion adjacent to said connecting portion,

wherein a rib is formed between said pair of apertures.

6. The piston of claim 5, wherein said rib is formed on an inner surface of said head portion.

7. The piston of claim 5, wherein said rib is formed on an outer surface of said head portion.

8. The piston of claim 5, wherein said fluid displacement apparatus is a swash plate-type compressor.