Method and apparatus for controlling speed changing unit

Details Method and apparatus for controlling speed changing unit Method and apparatus for controlling speed changing unit

1990-09-20

1992-03-03

Diehl, Dwight

Machine element or mechanism

Rotary member or shaft indexing, e.g., tool or work turret

Preselected indexed position

74745, B60K 4106

Patent

active

050922009

ABSTRACT:
The present invention is concerned with a transmission constructed in the two-staged structure including main speed changing units (1st, 2nd) and auxiliary speed changing units (H, L) which are provided with clutches (H, L, 1st, 2nd) which in turn are individually connected to electronic type pressure control valves (21 to 24) so as to enable the respective clutches to be controlled separately. When it is found that pressurized hydraulic oil delivered from a hydraulic pump has a shortage in amount at the time of starting of forward movement of a vehicle, feeding of hydraulic oil to the clutches (H, L) on the main speed changing unit side and the clutches (1st, 2nd) on the auxiliary speed changing unit side is effected with a certain time difference kept therebetween in order to suppress fluctuation in filling time due to reduction of an amount of hydraulic oil delivered from the hydraulic pump.

REFERENCES:
patent: 4324153 (1982-04-01), Sugimoto
patent: 4411174 (1983-10-01), Yokoi et al.
patent: 4690017 (1987-09-01), Taniguchi et al.
patent: 4693143 (1987-09-01), Harada et al.
patent: 4697475 (1987-10-01), Nishimura
patent: 4718310 (1988-01-01), Shindo et al.
patent: 4722247 (1988-02-01), Shindo et al.
patent: 4726262 (1988-02-01), Hayakawa et al.
patent: 4730519 (1988-03-01), Nakamura et al.
patent: 4790215 (1988-12-01), Aamano
patent: 4901600 (1990-02-01), Wilson

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