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Patent Searching and Data


Title:
HYDROSTATIC CONTINUOUSLY VARIABLE TRANSMISSION
Document Type and Number:
Japanese Patent JP2007092808
Kind Code:
A
Abstract:

To prevent creeping start when starting an engine, and to surely stop a vehicle in a slope, in regard to a hydrostatic continuously variable transmission provided with a hydraulic servo mechanism of structure for controlling tilting of a movable swash plate connected to a piston by supplying the charge pressure through a swash plate angle control valve in order to slide the piston.

At least one of pressure receiver chambers 20a and 20b is provided with a positioning means 89 for positioning the piston 21 at a neutral position, where supply of pressure oil to the pressure receiver chambers 20a and 20b is stopped, in relation to a spool 22 positioned corresponding to the neutral position of a movable swash plate of a hydraulic pump during the time when an engine for driving the hydraulic pump for supplying pressure oil to the pressure receiver chambers 20a and 20 is stopped.


Inventors:
SAKATA KOJI
MOCHIZUKI YASUHISA
Application Number:
JP2005000280570
Publication Date:
April 12, 2007
Filing Date:
September 27, 2005
Export Citation:
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Assignee:
YANMAR CO LTD
International Classes:
F16H61/42; F04B1/22; F04B1/26; F16H39/14; F16H61/40; F16H61/4069; F16H61/423; F16H61/433; F16H61/439; F16H59/74; F16H61/66
Domestic Patent References:
JPS63200690U1988-12-23
JPH0552431U1993-07-13
JP2001105915A2001-04-17
JP2004100897A2004-04-02
JP2001099265A2001-04-10
JPH11247755A1999-09-14
JP2003301943A2003-10-24
JPH11247990A1999-09-14
JPS5916549Y21984-05-15
Attorney, Agent or Firm:
矢野 寿一郎