Continuous variable transmission hydraulic pressure control device
AssigneesHyundai Motor Company, Kia Motors Corporation
InventorsYoung Joon Kim, Hyun Suk Kim
Life of this patent
Estimating the term…
Abstract
A continuous variable transmission (CVT) hydraulic pressure control device includes: a pressure regulation valve regulating an operation pressure of oil supplied to a friction element of a forward-rearward device; and a switch valve to respectively switch oil discharge paths through which the oil supplied to the friction element is discharged, respectively by a pilot pressure from the pressure regulation valve and an elastic force of a return spring. In particular, the oil discharge paths switched by the switch valve have oil flow resistances different from each other.
Claims8
A continuous variable transmission (CVT) hydraulic pressure control device comprising:
- a pressure regulation valve configured to regulate an operation pressure of oil supplied to a friction element of a forward-rearward device;
- and
- at least one switch valve configured to respectively switch oil discharge paths by a pilot pressure from the pressure regulation valve and an elastic force of a return spring,
- wherein:
- the oil supplied to the friction element is discharged through the oil discharge paths, and
- the oil discharge paths switched by the at least one switch valve are configured to have oil flow resistances different from each other, and
- wherein:
- the pressure regulation valve is a solenoid valve, and
- a controller is configured to:
- control the pressure regulation valve and regulate the pilot pressure supplied to the at least one switch valve based on a temperature of the oil.
A continuous variable transmission (CVT) hydraulic pressure control device comprising:
- a pressure regulation valve configured to regulate an operation pressure of oil supplied to a friction element of a forward-rearward device;
- and
- a switch valve configured to respectively switch oil discharge paths by a pilot pressure from the pressure regulation valve and an elastic force of a return spring,
- wherein:
- the oil supplied to the friction element is discharged through the oil discharge paths, and
- the oil discharge paths switched by the switch valve are configured to have oil flow resistances different from each other, and
- wherein the switch valve is installed between a manual valve and the friction element and configured to supply the operation pressure from the pressure regulation valve to the friction element through the manual valve operated by a transmission lever.
A continuous variable transmission (CVT) hydraulic pressure control device comprising:
- a pressure regulation valve configured to regulate an operation pressure of oil supplied to a friction element of a forward-rearward device;
- and
- a switch valve configured to respectively switch oil discharge paths by a pilot pressure from the pressure regulation valve and an elastic force of a return spring,
- wherein:
- the oil supplied to the friction element is discharged through the oil discharge paths, and
- the oil discharge paths switched by the switch valve are configured to have oil flow resistances different from each other, and
- wherein the switch valve is connected to a manual valve and configured to receive the oil discharged from the friction element through the manual valve operated by a transmission lever and then discharge the received oil.
Dependencies are inferred from the claim text.