CLUTCHING DEVICE OF AN AUTOMATIC TRANSMISSION
First Claim
1. A clutching apparatus of an automatic transmission, the clutching apparatus comprising:
- a clutch drum connected to a first rotation element;
a clutch connected to the clutch drum and a second rotation element rotatably engaged to the first rotation element and selectively transmitting a torque between the first and second rotation elements; and
a piston device selectively operating the clutch to connect the first and second rotation elements,wherein the piston device includes;
a first piston forming a first sealed space with the first rotation element and the clutch drum and movable toward the clutch by a first hydraulic pressure supplied to the first sealed space through a first hydraulic line formed in the first rotation element;
a second piston forming a second sealed space with the first piston and movable toward the clutch to directly press the clutch by a second hydraulic pressure supplied to the second sealed space through a second hydraulic line formed in the first rotation element and a third hydraulic line formed in the first piston;
a spring retainer fixed on the first rotation element and forming a third sealed space with the second piston and the first rotation element; and
a return spring stored in the third sealed space and abutted by the spring retainer and the second piston to apply a restoring force to the first and second pistons.
1 Assignment
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Accused Products
Abstract
A clutching device of an automatic transmission may include a clutch drum connected to a first rotation element, a clutch connected to the clutch drum and a second rotation element, and a piston device to operate the clutch, wherein the piston device may include a first piston forming a first sealed space with the first rotation element and the clutch drum and moving toward the clutch by a hydraulic pressure supplied to the first sealed space, a second piston forming a second sealed space with the first piston and moving toward the clutch to directly press the clutch by a hydraulic pressure supplied to the second sealed space, a spring retainer disposed on the first rotation element and forming a third space with the second piston and the first rotation element, and a return spring stored in the third space and abutted by the spring retainer and the second piston.
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Citations
19 Claims
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1. A clutching apparatus of an automatic transmission, the clutching apparatus comprising:
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a clutch drum connected to a first rotation element; a clutch connected to the clutch drum and a second rotation element rotatably engaged to the first rotation element and selectively transmitting a torque between the first and second rotation elements; and a piston device selectively operating the clutch to connect the first and second rotation elements, wherein the piston device includes; a first piston forming a first sealed space with the first rotation element and the clutch drum and movable toward the clutch by a first hydraulic pressure supplied to the first sealed space through a first hydraulic line formed in the first rotation element; a second piston forming a second sealed space with the first piston and movable toward the clutch to directly press the clutch by a second hydraulic pressure supplied to the second sealed space through a second hydraulic line formed in the first rotation element and a third hydraulic line formed in the first piston; a spring retainer fixed on the first rotation element and forming a third sealed space with the second piston and the first rotation element; and a return spring stored in the third sealed space and abutted by the spring retainer and the second piston to apply a restoring force to the first and second pistons. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A clutching apparatus of an automatic transmission, the clutching apparatus comprising:
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a clutch drum connected to an input shaft; a clutch connected to the clutch drum and connected to a planet carrier of a planetary gear set to selectively transmit torque between the input shaft and the planet carrier; and a piston device selectively operating the clutch to connect the input shaft and the planet carrier, wherein the piston device includes; a first piston forming a first sealed space with the input shaft and the clutch drum and movable toward the clutch by a first hydraulic pressure supplied to the first sealed space through a first hydraulic line formed in the input shaft; a second piston forming a second sealed space with the first piston and movable toward the clutch to directly press the clutch by a second hydraulic pressure supplied to the second sealed space through a second hydraulic line formed in the input shaft and a third hydraulic line formed in the first piston; a spring retainer fixed on the input shaft and forming a third sealed space with the second piston and the input shaft; and a return spring stored in the third sealed space and abutted by the spring retainer and the second piston to apply a restoring force to the first and second pistons. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19)
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Specification