JPH03186618A - Hydraulic clutch - Google Patents

Abstract

PURPOSE:To enhance the disengaging function of a clutch by disposing a radial bearing between a position forward of a clutch cover and an input shaft on the clutch disc side, and by disposing a limiting member which allows rotation but limits axial movement and a friction member which rotates and brakes the clutch disc. CONSTITUTION:An input shaft 2a on the clutch disc 3 side and an input shaft 2b on the transmission side are coupled together by a spline 2c. The clutch disc 3 is integrally formed with the input shaft 2a. A radial bearing 30 is disposed between a position forward of a clutch cover 6 and the input shaft 2a integral with the clutch disc 3, and a limiting member 40 which allows rotation but limit axial movement and a friction member 41 are disposed between a position rearward of the clutch cover 6 and the input shaft 2a integral with the clutch disc 3. A differential pressure between a hydraulic pressure pc2 in the clutch cover 6 and the atmospheric pressure 50 outside of the clutch cover 6 causes the clutch disc 3 to be smoothly disengaged from the clutch cover 6.

Description

[Detailed description of the invention] <Industrial application field> The present invention relates to a hydraulic clutch for an automobile.

<Conventional technology> A clutch disc mounted on the input shaft of a flywheel fixed to the engine's crankshaft is pressed in the direction of clutch engagement by a hydraulically actuated piston mounted on the back of the flywheel, and the spring force A hydraulic clutch in which a clutch disc is biased in the direction of clutch disengagement is known, for example, from Japanese Utility Model Application No. 59-88524.

In the above-mentioned hydraulic clutch, a hydraulic piston is used to engage the clutch, but a spring is used to disengage the clutch, so there is a problem in the responsiveness of clutch M engagement.

Further, the above-mentioned hydraulic clutch is a so-called dry type, and requires measures to prevent wear of the clutch disk, which is repeatedly and severely pressed by a hydraulic piston.

In order to improve these problems, the inside of the clutch cover in which the clutch disc and hydraulic piston are installed is sealed, and oil at a predetermined pressure supplied from an oil pump is circulated within this sealed space. A hydraulic clutch is provided in which pressure oil always acts on a hydraulic piston in a backward direction to disengage the clutch, and a hydraulic pressure higher than the oil pressure in the sealed space is applied to the hydraulic piston to connect the clutch. .

<Invention or Problem to be Solved> In the wet hydraulic clutch in which the latch cover is filled with pressure oil as described above, the lubricating effect of the clutch disc by the pressure oil is improved, but it is difficult to press the clutch disc. Even if the piston is separated, the clutch disc remains on the clutch cover, making it difficult for the clutch to disengage.
Due to the drag of the pressure oil inside the clutch cover, the rotation of the clutch disc does not decrease quickly, making it difficult to shorten the shift time.

Means for Solving the Problems> The present invention has been made in order to improve the above-mentioned problems.A ring gear is provided on a flex plate fixed to the crankshaft of the engine, and a clutch cover is provided with a ring gear that meshes with the ring gear. The clutch cover includes a clutch disc and a hydraulic piston that presses the clutch disc in the clutch connecting direction, and pressure oil that presses the hydraulic piston in the clutch disengaging direction is constantly circulated in the clutch cover. In the supplied hydraulic clutch, the input shaft is divided into a clutch disc side and a transmission side and spline-coupled, and the clutch disc is integrated with the clutch disc side input shaft, and the front position of the clutch cover and the clutch disc are connected together. A radial bearing is interposed between the rear side of the clutch cover and the input shaft on the clutch disc side, and a regulating member that allows rotation in the direction of rotation but restricts the axial direction and brakes the rotation of the clutch disc. A friction member is interposed therebetween.

With the above configuration, the clutch disc is reliably separated from the clutch cover by the pressure difference between the pressure oil inside the clutch cover and the atmospheric pressure outside the clutch cover, and the friction member applies a braking action to the rotation of the clutch disc. This reduces the rotation of the input shaft early and shortens the shift time.

<Example> Hereinafter, an example of the present invention will be explained based on the drawings. Figure 0 shows the overall configuration of a hydraulic clutch, where 1 is the crankshaft of the engine, 2a and 2b are input shafts, and this input shaft 2a and 2b are input shafts.
, 2b are divided into an input shaft 2a on the clutch disk 3 side and an input shaft 2b on the transmission side, and the re-input shafts 2a and 2b are connected by a spline 2C. The Crafti disk 3 is constructed integrally with one input shaft 2a.

Reference numeral 6 denotes a clutch cover that is arranged in a sealed manner on the input shaft 2a. The clutch disc 3 is disposed within the clutch cover 6, and a piston 11 for pressing the clutch disc 3 against the clutch cover 6 is also provided. 10 is a cylinder that slidably holds the piston 11, and 12 is a rotation preventing member that allows the piston 11 to slide and restricts the rotation direction.

A flex plate 4 is fixed to the crankshaft 1, and a ring galley connected to a starter motor is attached to the outer diameter end of the flex plate. A ring gear 7 for power transmission is fixed to the flex plate 4, and a ring gear 8 that meshes with the ring gear 7 is fixed to the outer surface of the clutch cover 6.

13 is an oil pump, and 14 is a control pulp.

The control valve 14 includes a boat 16 that supplies pressure oil DC1 to the back chamber of the piston 11 via an oil passage 15;
A boat 19 that supplies pressure oil PC2 to a space 17 in the clutch cover 6, and a boat that returns the pressure oil PC2 in the space 17 to the oil pump 13 from an oil passage 18 through a gap between the front surface of the piston 11 and the clutch disc 3. 20.

Further, a radial bearing 30 is interposed between the front position of the clutch cover 6 and the input shaft 2a integrated with the clutch disc 3, and a radial bearing 30 is interposed between the rear position of the clutch cover 6 and the input shaft 2a integrated with the clutch disc 3. A regulating member 40 and a friction member 41 are interposed between the shaft 2a and the shaft 2a to allow rotation in the direction of rotation and restrict the rotation in the axial direction. This regulating member 40
For example, a thrust bearing or metal is suitable.

In the hydraulic clutch configured as described above, the rotational power of the crankshaft 1 is transmitted to the clutch cover 6 via the flex plate 4 and the ring gear 7.8.

On the other hand, the pressure oil pc2 from the oil pump 13 is supplied to the space 17 inside the clutch cover 6 from the photo 19, and
The interior is filled with pressure oil pc2 at a predetermined pressure. The oil then passes through the gap between the front surface of the piston 11 and the clutch disk 3 and returns to the boat 20 via the oil passage 18, thereby performing a circulating action. The piston 11 is always pushed in the backward direction away from the clutch disc 3 by this pressure oil pc2, thereby performing a clutch disengagement action.

In this state, to connect the clutch, pressure oil pC1 is supplied from the boat 16 to the back surface of the piston 11 via the oil passage 15. This pressure oil pc1 has a higher pressure than the pressure oil pc2, so that the piston 11 overcomes the pressing force of the pressure oil pc2 and moves forward, presses the clutch disc 3 against the clutch cover 6 and is transmitted to the clutch cover 6. The rotational power of the engine is transmitted to the input shafts 2a and 2b via the clutch disc 3.

Therefore, in the present invention, the clutch disc 3 is integrated with the input shaft 2a that is divided in the axial direction from the input shaft 2b on the transmission side, and the clutch cover 6 is provided with a radial bearing 30 and a regulating member 40 at its front and rear positions. Since it is coupled to the input shaft 2a allowing only the rotational direction,
The clutch disc 3 is smoothly separated from the clutch cover 6 due to the differential pressure between the pressure oil DC2 inside the clutch cover 6 and the atmospheric pressure 50 outside the clutch cover 6. Also, by utilizing the return movement of the clutch disc 3 at this time, the friction member 4
1 brakes the rotation of the input shaft 2a integrated with the clutch disc 3, and as a result, the rotation of the input shaft 2b on the transmission side is quickly reduced, thereby shortening the shift time.

<Effects of the Invention> As described above, according to the present invention, the input shaft is divided into the clutch disc side and the transmission side and spline-coupled, the clutch disc is integrated with the clutch disc side input shaft, and the clutch cover is A radial bearing is interposed between the front position and the input shaft on the clutch disc side, and between the rear position of the clutch cover and the input shaft on the clutch disc side, there is a regulating member and a clutch that allow the rotational direction but restrict the axial direction. Since the structure includes a friction member that brakes the rotation of the disc, the clutch disc can be smoothly and reliably separated from the clutch cover, improving the clutch disengagement performance of this type of hydraulic clutch, and also improving the clutch disengagement performance of this type of hydraulic clutch. Rotational braking has the advantage of shortening shift time.

[Brief explanation of drawings]

The figure is a sectional view of a main part of the present invention. 1... Crankshaft, 2a, 2b... Input shaft,
2C...Spline, 3...Clutch disc, 4
a, 4b...Flex plate, 6...Clutch cover 11...Piston, 13...Oil bong 1.1
4... Control valve, 30... Radial bearing 40... Regulating member, 41... Friction member, 50
···Atmospheric pressure. Patent Applicant Hino Motors Co., Ltd. Agent Tomasobe Parr

Claims (1)

[Claims] A ring gear is provided on a flex plate fixed to the crankshaft of the engine, a clutch cover has a ring gear that meshes with the ring gear, and a clutch disc and a hydraulic piston that presses the clutch disc in the clutch connection direction are disposed within the clutch cover. In the hydraulic clutch, the input shaft is divided into a clutch disc side and a transmission side and spline-coupled to each other, and the input shaft is divided into a clutch disc side and a transmission side, and the clutch cover is constantly circulated and supplied with pressure oil that presses the hydraulic piston in the clutch disengagement direction. The disc is integrated with the input shaft on the clutch disc side,
A radial bearing is interposed between the front position of the clutch cover and the input shaft on the clutch disc side, and the rotational direction is permitted but the axial direction is restricted between the rear position of the clutch cover and the input shaft on the clutch disc side. A hydraulic clutch characterized by interposing a friction member for rotationally braking a regulating member and a clutch disc.