JPH04351326A - Hydraulic clutch - Google Patents

Abstract

PURPOSE:To reduce occurrence of drag torque in a hydraulic clutch in which a clutch disc is incorporated in a flywheel, pressure oil which presses and energizes the clutch disc in the direction of clutch disengagement at all times is circulated and supplied to an empty section in the flywheel, and the clutch disc is pressed in the direction of clutch connection by a piston which is operated by pressure oil. CONSTITUTION:A rotary plate 30 is fixed to a crankshaft 1, and a flywheel 6 is connected to and supported on the rotary plate 30 rotatably. The rotary plate 30 and flywheel 6 rotate and transmit power via a flywheel damper consisting of a coil spring 32 and a driven plate 31.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hydraulic clutch for an automobile.

0002

2. Description of the Related Art As shown in FIG. 2, a disk hub 22 having a driven disk 23 on an input shaft 2 of a transmission is spline-fitted into a flywheel 6 connected to a crankshaft 1 of an engine. The clutch disc 3 is arranged via a damper made of a coil spring 24 that is locked to the window part of the clutch disc 3.
A piston 11 is fitted into a cylinder 10 provided on the flywheel 6 on the back side so as to be movable in an axial direction parallel to the input shaft 2. The piston 11 is arranged on the input shaft 2 and driven by the rotation of the input shaft 2. Pressure oil from the oil pump 13 is supplied to the cylinder 10 through the passage 15 under the control of the control valve 14, and the piston 11 is moved forward, and the piston 11 is guided by the guide groove 21 to the flywheel 6. The clutch disc 3 is pressed in the direction of clutch engagement through the pressure plate 20 which has been inserted, and the clutch disc 3 is pressed by the constantly circulating pressure oil PC2 which enters the space 17 in the flywheel 6 from the passage 18 and returns to the control valve 14. Hydraulic clutches that are biased in the direction of clutch disengagement are well known.

[0003] Reference numeral 4 denotes a flex plate, which is fixed to the crankshaft 1 and to the flywheel 6. A ring gear 5 is fixed to the outer periphery of the flex plate 4 and meshes with the starter gear.

0004

[Problems to be Solved by the Invention] By the way, in the conventional hydraulic clutch described above, a damper mechanism consisting of a coil spring 24 is disposed within the flywheel 6, so that the damper mechanism has a damper mechanism that prevents the pressure oil PC2 that is constantly circulating. Drag torque (
(dragging torque) may be generated.

An object of the present invention is to provide a hydraulic clutch that solves the above-mentioned conventional problems.

[0006]

[Means for Solving the Problems] The gist of the present invention to achieve the above object is to spline-fit a clutch disc in a flywheel to an input shaft of a transmission via a disc hub, and to In a hydraulic clutch that is equipped with a hydraulic piston that presses a clutch disc in a direction of engagement, and that constantly circulates and supplies pressurized oil that presses the hydraulic piston in a direction of clutch disengagement in the flywheel, a rotating plate is fixed to the crankshaft of an engine. The flywheel is rotatably connected and supported by the rotary plate, and rotational power is transmitted between the rotary plate and the flywheel via a flywheel damper comprising a coil spring and a driven plate.

[0007]

[Operation] With the above structure, torque fluctuations are absorbed by the flywheel damper disposed outside the flywheel, and drag torque is reduced by eliminating pressure oil in the flywheel.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Examples of the present invention will be described below with reference to the drawings. In FIG. 1, 1 is a crankshaft, 2 is an input shaft of a transmission, and 6 is a flywheel. Two members, a front part 6a and a rear part 6b, are sealed together and have a space 17 inside. A clutch disc 3 is disposed within this space 17 via a disc hub 22 spline-fitted to the input shaft 2. .

A concentric annular cylinder 10 is provided at the rear part 6b of the flywheel 6 in an axial direction parallel to the input shaft 2, and an annular piston 11 is fitted into the cylinder 10 so as to be movable forward and backward.

13 is an oil pump, and 14 is a control valve, which are arranged on the input shaft 2. The oil pump 13 is driven by the rotation of the input shaft 2, and the control valve 14 is controlled based on commands from a control device. As in the conventionally known hydraulic clutch, pressure oil is supplied to the cylinder 10 through the passage 15, so that the piston 11
is moved forward to press the clutch disc 3 in the clutch connecting direction via the pressure plate 20 guided by the guide groove 21 provided in the flywheel 6. Although not shown in FIG. 1, the clutch disc 3 is declutched using the constantly circulating pressure oil that is supplied from the control valve 14 to the space 17 in the flywheel 6 through a passage and returned to the control valve 14. It is pressed and biased in the direction.

[0011] 30 is a rotating plate. This rotating plate 30 is fixed to the crankshaft 1 between the engine crankshaft 1 and the flywheel 6. The rotating plate 30 has a boss portion 30a, and the front portion 6a of the flywheel 6 is rotatably coupled and supported to the boss portion 30a via a bearing 34. 35 is a seal member that closes the gap between the bearings 34.

Reference numeral 31 denotes a driven plate provided on the rotary plate 30, a coil spring 32 is locked in a window portion of the driven plate 31, and the driven plate 31 and the front portion 6a of the flywheel 6 form a spline. 33 to form a flywheel damper. A ring gear 5 is fixed to the outer periphery of the rotating plate 30, and meshes with a starter gear (not shown).

Since the present invention has the above-described structure, the rotation of the crankshaft 1 absorbs torque fluctuations through the fuller wheel damper of the rotating plate 30, the driven plate 31, and the coil spring 32, and
is transmitted to.

In the flywheel 6, the clutch disc 3 is urged in the clutch disengagement direction by pressure oil circulating in the space chamber 17, as in the conventional case, and is supplied to the cylinder 10 under the control of the control valve 14. The piston 11 is moved forward by pressure oil to press the clutch disk 3 in the clutch connecting direction via the pressure plate 20.

[0015]

As described above, the present invention provides a hydraulic clutch in which a clutch disc is disposed inside the flywheel, in which a rotary plate is fixed to the engine crankshaft, and the flywheel is rotatably coupled to the rotary plate. Since the rotational power is transmitted between the rotary plate and the flywheel via a flywheel damper made of a coil spring and a driven plate, the clutch disc is always pressed in the clutch disengagement direction in the space inside the flywheel. The damper, which reduces the resistance of the pressurized oil, is eliminated, and the generation of drag torque can be reduced.

[Brief explanation of drawings]

[Fig. 1] Cross-sectional view of the present invention

[Figure 2] Conventional sectional view

[Explanation of symbols]

1 Crankshaft 2 Input shaft 3 Clutch disc 6 Flywheel 10 Cylinder 11 Piston 17 Space section 22 Disc hub 30 Rotating plate 31 Driven plate 32 Coil spring

Claims (1)

[Claims] 1. A clutch disc is spline-fitted to an input shaft of a transmission via a disc hub within a flywheel, and the flywheel is provided with a hydraulic piston that presses the clutch disc in a connecting direction. In a hydraulic clutch that constantly circulates and supplies pressure oil that presses the hydraulic piston in the clutch disengagement direction, a rotary plate is fixed to the crankshaft of the engine, the flywheel is rotatably connected and supported to the rotary plate, and the flywheel is rotatably connected and supported by the rotary plate, A hydraulic clutch characterized in that rotational power is transmitted between a rotating plate and a flywheel via a flywheel damper consisting of a coil spring and a driven plate.