Hydraulic control system in a continuously variable transmission
AssigneeBosch Transmission Technology B.V.
InventorWilhelmus Johannes Maria Van Wijk
Life of this patent
Estimating the term…
Abstract
A hydraulic control system in a continuously variable transmission (2) is provided with a pump (40) for supplying hydraulic fluid, a main line (41), a line pressure valve (V3), an auxiliary line (42) and a auxiliary pressure valve (V9). The line pressure valve (V3) being arranged to control a line pressure LP in the main line (41) by discharging a surplus of hydraulic fluid supplied by the pump (40) into the auxiliary line (42). The auxiliary pressure valve (V9) is arranged to variably control auxiliary pressure AP in the auxiliary line (41), preferably in dependence on the line pressure LP in the main line (41).
Claims10
A hydraulic control system in a continuously variable transmission provided with a pump for the supply of hydraulic fluid, comprising:
- a main line;
- a main line pressure valve;
- an auxiliary line;
- and
- an auxiliary pressure valve, wherein
- the main line pressure valve is arranged to control a hydraulic pressure in the main line,
- the main line pressure valve is capable of discharging a surplus of the hydraulic fluid supplied by the pump into the auxiliary line,
- the auxiliary pressure valve is controllable whereby this auxiliary pressure valve is capable of varying hydraulic pressure in the auxiliary line and
- the auxiliary pressure valve is arranged to control the hydraulic pressure in the auxiliary line in dependency on the hydraulic pressure in the main line.
A hydraulic control system in a continuously variable transmission provided with a pump for the supply of hydraulic fluid, comprising:
- a main line;
- a main line pressure valve;
- an auxiliary line;
- and
- an auxiliary pressure valve, wherein
- the main line pressure valve is arranged to control a hydraulic pressure in the main line,
- the main line pressure valve is capable of discharging a surplus of the hydraulic fluid supplied by the pump into the auxiliary line,
- the auxiliary pressure valve is controllable whereby this auxiliary pressure valve is capable of varying hydraulic pressure in the auxiliary line,
- the auxiliary pressure valve is hydraulically controllable, and
- the auxiliary pressure valve is provided with a hydraulic connection line that provides a direct hydraulic connection to the main line.
Dependencies are inferred from the claim text.