The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 24, 1998
Filed:
Jul. 23, 1996
Tsutomu Tominaga, Tokyo, JP;
Masayasu Miyajima, Tokyo, JP;
Kazuhiro Geshi, Tokyo, JP;
Kiyoshige Shimaoka, Tokyo, JP;
Mauri Ukonmaanaho, Tokyo, JP;
Tomohide Maruyama, Tokyo, JP;
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Mitsubishi Jidosha Kogyo Kabushiki Kaisha, Tokyo, JP;
Abstract
A high-pressure pump unit allowing an oiltight test for a high-pressure piping system after assembly without damaging parts which do not have a pressure resistance construction. The pump unit comprises a high-pressure pump (11) for sucking fuel and pressurizing it, a high-pressure regulator (14) coupled through a fuel consuming section (3, 4) to the outlet side of the high-pressure pump for regulating the pressure to the fuel discharged under a high pressure from the high-pressure pump, a fuel pressure switching valve (15) placed in a bypass extending from an upstream side of the high-pressure regulator to a downstream side thereof for opening and closing the bypass in accordance with an operational mode, a check valve (12) located between the high-pressure pump and the fuel consuming section, and a check valve (17) placed between an exit passage (18) of the high-pressure regulator and a passage (19) through which the fuel in the outside of the high-pressure section of the high-pressure pump is discharged to the outside of the high-pressure pump.