Title:
MULTIPLE-GAIN TRIM VALVE FOR SELECTIVELY COUPLABLE FRICTION DEVICE
Document Type and Number:
Japanese Patent JP3451056
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To achieve a multiple-gain factor with a simple structure and with high precision by coupling a pool valve having a differential region receiving coupling pressure and a control region receiving trim control pressure and a plug valve receiving the trim control pressure in a valve bore.
SOLUTION: A spool valve 30 and a plug valve 32 are arranged in a valve bore 34 to form a trim valve 16. The pressure in a device feed port 70 communicated with a torque transmission mechanism 18 is communicated with a pressure-responsive differential region 78 (area A1). The pressure of a trim port 68 pushes the spool valve 30 to the left against a spring 48 and acts a pressure-responsive region (area A4) to push the plug valve 32 to the left. The boost control pressure selectively outputted from a port 66 acts in the opposite direction to the pressure of an end section 84. A gain factor can be adjusted by changing the ratio of A4/A1 in the design of the trim valve 16.
Inventors:
Charles Francis Long
Jeffrey Jay Cole
Martin Robert Dadel
Jeffrey Jay Cole
Martin Robert Dadel
Application Number:
JP2000177858A
Publication Date:
September 29, 2003
Filing Date:
June 14, 2000
Export Citation:
Assignee:
GENERAL MOTORS CORPORATION
International Classes:
F16K31/122; F16D48/06; F16H61/00; F16H61/06; (IPC1-7): F16H61/00; F16K31/122
Domestic Patent References:
| JP4145260A | ||||
| JP8159263A | ||||
| JP8159262A | ||||
| JP7224914A | ||||
| JP1122795A |
Other References:
【文献】米国特許5911244(US,A)
Attorney, Agent or Firm:
Kazuo Shamoto (5 outside)