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Patent Searching and Data


Title:
HYDRAULIC PUMP
Document Type and Number:
Japanese Patent JP2010025266
Kind Code:
A
Abstract:

To solve the conventional problem that a charge pump is required to be mounted separately in order to replenish an insufficient working fluid due to unavoidable leakage from the closed circuit although a variable displacement type hydraulic pump and a hydraulic motor are in fluid-connection with each other by the closed circuit constituted of a pair of main oil paths in a hydraulic actuator such as a hydraulic continuously variable transmission which causes an unavoidable increase in component cost and the deterioration of maintenability resulting from an increase in the number of part items.

A hydraulic pump 2 which is brought into fluid connection with a hydraulic motor 3 by a closed circuit is provided with a charge structure 28 for supplying a part of pressure oil discharged from the hydraulic pump 2 to working fluid replenishing oil paths 43, 46 in the closed circuit.


Inventors:
MOCHIZUKI YASUHISA
Application Number:
JP2008000188925
Publication Date:
February 04, 2010
Filing Date:
July 22, 2008
Export Citation:
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Assignee:
KANZAKI KOKYUKOKI MFG CO LTD
International Classes:
F16H39/14; F04B1/22; F16H61/40
Domestic Patent References:
JPS60182557U1985-12-04
Attorney, Agent or Firm:
矢野 寿一郎