Title:
CONTROL DEVICE OF HYDRAULIC ACTUATION TYPE TRANSMISSION FOR VEHICLE
Document Type and Number:
Japanese Patent JP2964204
Kind Code:
B2
Abstract:
PURPOSE: To reduce an in-gear shock by providing a directional control valve free to control direction in a first position communicating a back pressure chamber of an accumulator connected in parallel to a hydraulic engagement element for a low speed step and a back pressure generation source to each other and in a second position to make internal pressure of the back pressure chamber low pressure by way of cutting this communication.
CONSTITUTION: In a hydraulic control circuit 10 of a transmission to carry out speed change of advance four steps and a reverse one step, to an oil passage L23 for back pressure of an accumulator A1 connected in parallel to a hydraulic engagement element C1 for a low speed step, hydraulic pressure from an oil passage L22 is supplied through a directional control valve 33. On the directional control valve 33, hydraulic pressure of the element 1 is made to work through an oil passage L2c, until this hydraulic pressure rises to specified pressure, the oil passage L23 for back pressure is connected to an oil drainage port 33a, and back pressure of the accumulator A1 is made low pressure. At the initial stage of in-gear, pressure rise of the hydraulic engagement element C1 for the low speed step is damped in a low pressure range and the element C1 is gradually engaged, and thereafter, at the point of time when hydraulic pressure of the element C1 rises to the specified pressure, the directional control valve 33 is controlled to change direction and to supply hydraulic pressure to the oil passage L23 for back pressure.
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Inventors:
SAKAI TAKAFUMI
WAKAMATSU HIDEKI
HARAGUCHI KENICHI
TAKAMATSU MASAAKI
WAKAMATSU HIDEKI
HARAGUCHI KENICHI
TAKAMATSU MASAAKI
Application Number:
JP21750093A
Publication Date:
October 18, 1999
Filing Date:
September 01, 1993
Export Citation:
Assignee:
HONDA GIKEN KOGYO KK
International Classes:
F16H61/06; F16H61/02; (IPC1-7): F16H61/06
Domestic Patent References:
| JP4157258A | ||||
| JP2253043A | ||||
| JP6298851U |
Attorney, Agent or Firm:
Kinichi Kitamura (2 others)
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