JPS6136518A - Hydraulic clutch apparatus - Google Patents

Abstract

PURPOSE:To facilitate the incorporation of return springs by fitting the return spring between a receiving hole formed onto a clutch piston and a ring plate installed onto the outside of a through hole formed onto a humid type clutch mechanism. CONSTITUTION:Return springs 100 and 106 are incorporated between the drums 30 and 42 and the center clutch pistons 58 and 60 in a humid type clutch mechanism installed onto the both sides. The return spring 100 is fitted by inserting one edge of the return spring 100 into a receiving hole 102 formed onto the outside surface opposed to the incorporation part of an accelerator piston 76 of a clutch piston 58. The other edge of the return spring 100 is fited by fitting the ring plate 114 for the clutch shaft 10 of a snap ring 112 onto the outside of a through hole 104 formed onto the drum 30. As for the return spring 106, the same passes.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a hydraulic clutch device used in an automatic transmission such as a tractor that has a large transmission torque. The present invention relates to a hydraulic clutch device having a structure in which the hydraulic pressure chambers of the clutch piston are separated into left and right sides during initial operation to hydraulically operate the clutch piston.

(Background of the Invention) Conventionally, as this type of hydraulic clutch, a hydraulically actuated clutch mechanism disclosed in Japanese Patent Publication No. 46-5645, for example, is known.

This hydraulically actuated clutch mechanism has a clutch piston installed coaxially with the clutch shaft, and a pair of wet clutches on both sides of the clutch piston that connects and disconnects power transmission between the input gear and the clutch shaft by the hydraulic actuation of the clutch piston. The hydraulic pressure chamber in the clutch piston is separated into left and right sides by a separate plate, and valve discs are provided on both sides of a plurality of communication holes provided in the separate plate that communicate the separated liquid chambers. When hydraulic pressure is supplied to one of the hydraulic chambers, the valve disc on the side where the hydraulic pressure is applied closes the communication hole in the separate plate to separate the hydraulic chambers, and the hydraulic pressure of the clutch piston moves the valve disc to one wet type. The clutch creates an e-friction contact state to transmit power to the clutch shaft.

Furthermore, in the above-mentioned hydraulically operated clutch mechanism, in order to prevent shock and wear caused by sudden engagement of the clutch by avoiding direct application of hydraulic pressure to the clutch piston, each 11! An accelerator piston is installed on the empty inflow side, and when hydraulic pressure is applied, the clutch piston is initially activated to create a clutch contact state.
The initial actuation of the accelerator piston moves the valve disc and closes the communication hole in the separate plate to separate the fluid chambers, and then supplies fluid pressure to the clutch piston through the orifice provided in the accelerator piston, thereby increasing the smoothness of the clutch piston. This hydraulic actuation creates an exponential increase in friction torque when the clutch is engaged, preventing wear on the clutch disc due to clutch shock or slipping during engagement.

By the way, in such a conventional hydraulic clutch i*g, in order to return the clutch piston to the neutral position with the hydraulic pressure of the clutch piston set to zero, the clutch piston and the hydraulic clutch mechanism arranged on both sides of the clutch piston are used. A return spring is installed between the spring and the spring, and the return spring is installed and fixed by forming a receiving hole in the member located at the end of the spring, and inserting the end of the spring into this receiving hole to support the return spring. It has a structure.

However, in such a conventional return spring support structure, a plurality of return springs are interposed between members in which receiving holes are formed during assembly.
The spring must be assembled while being compressed, the return spring must be aligned at the same time as other members are positioned, and the spring reaction force is generated during assembly, so it is difficult to assemble the parts located on both sides of the spring. The problem was that it was difficult to do.

(Object of the Invention) The present invention has been made in view of such conventional problems, and it is possible to assemble a return spring provided between a clutch piston and a wet clutch mechanism by using a member that supports the spring from both sides. It is an object of the present invention to provide a hydraulic clutch device in which rough fitting of a return spring can be performed simply and easily, independently of rough fitting.

(Structure of the Invention) In order to achieve this object, the present invention provides a separate member that divides the hydraulic pressure chamber in the exchange piston into left and right parts by installing a plurality of drive and driven clutch discs on both sides of the clutch piston coaxially arranged on the clutch shaft. A pair of valve discs are provided opposite to each other on both sides of a plurality of communicating holes arranged in an annular shape, and each of these valve discs is initially activated when hydraulic pressure is applied to connect the valve disc on the side where hydraulic pressure is applied to the connection of the separate member. An accelerator piston is provided that presses against the oversized opening to separate the hydraulic pressure chamber of the clutch piston, and after the accelerator piston separates the hydraulic chamber, the clutch piston is moved by supplying hydraulic pressure through an orifice formed in the accelerator piston. In the hydraulic clutch IAei, which moves in one direction and creates a power transmission state based on the II frozen contact of the wet clutch mechanism, N is arranged between the clutch piston and both sides thereof.
A return spring that returns the clutch piston to the neutral position is installed between the wet clutch mechanism, and one end of the return spring is inserted and locked into a receiving hole on the outer surface of the clutch piston, and the other end is inserted into the clutch mechanism side member. The ring plate is inserted through the through hole and locked by contact with the ring plate provided on the outside of the through hole.After the clutch piston and warm clutch mechanism are assembled, A return spring was inserted through the hole and the ring plate was fitted to prevent it from coming out.

(Embodiment) FIG. 1 is a cross-sectional explanatory diagram showing an embodiment of a hydraulic clutch V4m in which a return spring support structure according to the present invention is used.

First, to explain the configuration, reference numeral 10 is a clutch shaft, and both ends are rotatably supported on the casing by thrust bearings 24 and 26, and an input gear 14 is rotatably supported on the left side of the clutch shaft 10 via a needle bearing 12. There is also a needle bearing 1 on the left side.
An input gear 22 having a gear portion 18.20 is rotatably provided through the input gear 14. Furthermore, an output gear 25 is fixed to the clutch shaft 10 by spline fitting on the left side of the input gear 14.

The clutch shaft 10 between the input gears 14 and 22 is provided with the hydraulic clutch device of the present invention. That is, a drum 28 is fixed to the right side of the input gear 14, a plurality of drive clutch discs 36 are arranged on the inner peripheral spline of the drum 28, and a drum 30 spline-fitted to the clutch shaft 10 is installed inside the drum 28. A driven clutch plate 38 is provided on the outer peripheral spline of the drum 30 as a drive clutch! 136, the drums 28, 30, drive clutch! 1136 and the driven clutch disk 38 constitute one wet clutch mechanism.

Further, a drum 40 is fixed to the left side of the input gear 22,
The drum 40 has a plurality of drive clutch discs 46 arranged on splines 44 formed on the inner circumference, and the drum 42 is fixed to the clutch shaft 10 by spline fitting inside the drum 40, and the splines 48 formed on the outer circumference of the drum 42 are fixed to the inner side of the drum 40. Driven clutch board 50 is arranged in the drive clutch! 850 are arranged alternately with respect to the drive clutch disc 46, and the drums 40, 42, the drive clutch disc 46, and the driven clutch ff150 constitute the other wet clutch structure.

Between the wet clutch mechanisms installed on both sides,
A clutch piston mechanism is provided that connects and disconnects the clutch by hydraulic pressure.

In this clutch piston mechanism, a disc-shaped piston housing 56 is assembled to the left side of a cup-shaped piston housing 52 with a pair of snaps and a ring 54 in a sealed structure, and the clutch disc of the left-hand wet clutch mechanism One clutch piston 58 is formed facing each other, and the other clutch piston 60 is formed facing the clutch disc in the right wet clutch mechanism, and this clutch piston is designed to slide in the axial direction with respect to the clutch shaft 10. There is a calming feeling.

A separate plate 62 is incorporated inside the clutch piston 58, 60 formed by the clutch housings 52 and 56 to restrict movement in the axial direction, and separate hydraulic chambers 64 and 66 are formed within the piston. A communication hole 68 provided in the plate 62 communicates the hydraulic chambers 64 and 66, and a pair of valve discs 70.
72 is provided, and the valve disc 70.72 is supported at both ends of a guide dual pin 74 provided axially in the separate plate 62.

Furthermore, accelerator pistons 76 and 78 are located on the clutch shaft 10 side of the hydraulic pressure chambers 64 and 66 in the axial direction l! #Freely installed accelerator piston? '6.78 A hydraulic pressure chamber 80.82 is formed inside the hydraulic pressure chamber 80.82.
82 is an orifice 84.86 formed in the accelerator piston 76.78, which communicates with a hydraulic chamber 64.66 of the clutch piston 58.60. Further, guide bins 88 and 92 are incorporated between the clutch piston 58 and the drum 30° in the left wet clutch line groove, and between the clutch piston 60 and the drum 42 in the right wet clutch mechanism. It is fitted into the guide hole 90.94 on the 30.42 side to guide the axial movement of the clutch piston 58.60 and to prevent relative rotation between the piston and the drum 32.42.

Next, the fluid supply path to the hydraulic clutch device provided on the clutch shaft 10 will be explained. As is clear from the end view of the clutch shaft 10 in FIG. 2, the clutch shaft 10 has flai? An oil passage 120, a liquid passage 122 that supplies hydraulic pressure to the hydraulic pressure chamber 64 of the clutch piston 58, and a liquid passage 124 that supplies hydraulic pressure to the hydraulic pressure chamber 66 of the clutch piston 60 are independently formed. As is clear from FIG.
2.16 is supplied with rIJ crushed oil, and further branched passage 134.
136 supplies lubricating oil to the installed portion of the guide bin 88.92. Furthermore, the liquid passage 122 is connected to the branch passage 1.
44 to the hydraulic pressure chamber 80 of the accelerator piston 76, and the hydraulic passage 124 is connected to the hydraulic pressure chamber 82 of the accelerator piston 78 by a branch passage 146.

FIG. 3 is an explanatory cross-sectional view showing the assembled portion of the return spring in the hydraulic clutch device of FIG. 1, and in FIG.
6 is a drum 30 in a wet clutch mechanism provided on both sides.
and 42 respectively and the central clutch pistons 58 and 60
are incorporated between each of them. Furthermore, if we explain the left return spring 100 in detail,
Accelerator piston 7 in clutch piston 58
A receiving hole 102 is formed on the outer surface facing the built-in portion of 6, one end of the return spring 100 is inserted and locked into this receiving hole 102, and a through hole 104 is inserted into the drum 30 facing the receiving hole 102. A snap ring 112 is fitted onto the clutch shaft 10 and a ring plate 114 is attached to the outside of the through hole 104 to lock the other end of the return spring 100.

The installation 131i of this return spring 100 is the same for the right return spring 106,
Receiving hole 108 formed on the outer surface of clutch piston 60
Insert and lock one end of the return spring 106 into the drum 42, and insert the return spring 106 into the through hole of the drum 42.
6 through the other end and clutch the snap ring 116 on the outside of the through hole 106! The return spring 10 is assembled by incorporating the ring plate 118 by fitting it into the door foot 1o.
6 has a structure in which the other end is locked.

In such a mutually integrated structure of the return springs 100 and 106, the hydraulic clamp device is first assembled to the clutch shaft 10 by attaching the separate plate 62.
．． After assembling the valve discs 70, 72 and accelerator pistons 76, 78 to the clutch shaft 10 by lifting up the snap rings, the piston housings 52 and 54 are fitted from both sides and the clutch pistons 58, 78 are assembled. ．． 60, and then the drum 30. of the hydraulic clutch mechanism from both sides.
42 by spline fitting, and after fitting the drum 30.42 to the clutch shaft 10, the return springs 100, 106 are inserted from the outside into the through holes 104, 110 of the drum 30, 42, and then the ring Plate 114°118 with snap ring 112,
Clutch piston 58 by fixing with 116 VI
．． Return spring 100.1 returning 60 to neutral position
06 can be installed. That is, the return spring 10
0.106 is the clutch piston 58, 60. This can be carried out independently as soon as the assembly of the drum 30, 42 to the clutch shaft 10 in the wet clutch mechanism is completed, and the return spring 100, 106 is pushed in with the ring plate 114, 118/the snap ring 112, 116 onto the clutch shaft 10, and compared to the case where return springs are provided between each of the clutch pistons 58, 60 and the drums 30, 42, the work of assembling the return springs is extremely simple.
And it can be done easily.

Next, the operation of the hydraulic clutch device shown in FIG. 1 will be explained.

In the clutch open state where hydraulic pressure is not supplied to the hydraulic pressure chambers 64, 66 of the clutch pistons 58, 60, the third
The clutch pistons 58, 60 are supported in the neutral position by the return springs 100, 106 shown in the figure, and the wet clutch mechanisms on both sides are in the open state.

In this state, for example, if hydraulic pressure is supplied to the liquid passage 122 by operating a switching valve (not shown), the hydraulic pressure is first applied to the hydraulic pressure 'J80 of the accelerator piston 76, and the clutch piston 58 is moved to the left. An initial operation is performed to create a contact state between the drive clutch disc 36 and the driven clutch disc 38, and at the same time, the accelerator piston 76 moves toward the separate plate 62, and the pulp disc 70
is seated at the frontage of the communication hole 68 to partition the hydraulic chambers 64 and 66. Subsequently, the hydraulic pressure in the hydraulic pressure chamber 64 of the clutch piston 58 increases via the orifice 84 of the accelerator piston 76, and the clutch piston 5 increases in accordance with this hydraulic pressure upper limit.
6 drive clutch plate 36 and driven clutch 5
II of 1838! When the contact force 11 increases and the contact force exceeds the transmission power of the clutch, the clutch is connected, and the rotation of the input gear 14 is controlled by the wet clutch mechanism connected by the press of the clap piston 58. The signal is transmitted to the clutch shaft 10 through the clutch shaft 10 and taken out from the output gear 25.

After connecting the latch like this, turn off the switching valve and
22, the hydraulic pressure in the hydraulic seedling 64 disappears, and the clutch piston 58 is pushed back to the neutral position by the spring force of the return spring 100.
The clutch that was in the connected state is released.

(Effects of the Invention) As explained above, according to the present invention, one end of the return spring is inserted into a receiving hole provided on the outer surface of the clutch piston as a structure for incorporating a full-sized return spring with the clutch piston in the neutral position. At the same time, the other end of the return spring is passed through a through hole in a member of the wet clutch mechanism, and the other end of the return spring is provided outside the through hole and is locked when it comes into contact with the IC ring plate.
After attaching the clutch piston and wet clutch mechanism to the foot, a return spring can be fitted independently from the outside into the through hole provided in the clutch mechanism member, and the ring plate can be used to prevent the clutch from coming out. Since there is no need to interpose the return spring at the same time as the piston and wet clutch mechanism are assembled, the return spring can be assembled simply and easily.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram partially showing an embodiment of the present invention in cross section, Fig. 2 is a sectional view showing the integrated part of the return spring in the clutch device of Fig. 1, and Fig.
The figure is a left end view of the clutch shaft shown in FIG. 1. 10: Clutch shaft 12.16: Ni-Dollar bearing 14.22: Input gear 18.20: Gear part 24.26: Thrust bearing 25: Output gear 28.30.40.42 Ni drum 32.34.44.48 Ni Spline 36.46: Drive clutch disk 38.50: Drive clutch disk 52.56: Piston housing 58.60 + clutch piston 62: Separate plate 64.66.80.82: Hydraulic pressure chamber 68:1! Through hole 70.72 + Valve disc 74 Guide dual pin 76.78 Near accelerator piston 84.86, 126.128 Ni orifice 88.92 Guide pin 90.94 Guide hole 100.106: Return spring 102.108: Receiving hole 104.110 :Through hole 112.116:Snap ring 114.118:Ring plate 120:rIJWj oil liquid passage 124+liquid passage

Claims (1)

[Scope of Claims] A wet clutch mechanism is provided in which a plurality of drive and driven clutch discs are alternately arranged on both sides of a clutch piston coaxially arranged on a clutch shaft, and a separate hydraulic chamber in the clutch piston is separated into left and right sides. A pair of valve disks are provided opposite to each other on both sides of a plurality of communication holes arranged and formed in an annular manner in the member, and each of the valve disks is initially activated when hydraulic pressure is applied to cause the valve disk on the hydraulic pressure side to be connected to the separate member. An accelerator piston is provided that presses against the opening of the communication hole to separate the hydraulic pressure chamber of the clutch piston, and after the accelerator piston separates the hydraulic pressure chamber, the clutch piston is supplied with hydraulic pressure through an orifice formed in the accelerator piston. In a hydraulic clutch device that creates a power transmission state by frictional contact of the wet clutch mechanism by moving the clutch piston in one direction, the clutch piston is returned to a neutral position between the clutch piston and wet clutch mechanisms disposed on both sides thereof. A return spring is installed, and one end of the return spring is inserted into and locked in a receiving hole formed on the outer surface of the clutch piston, and the other end is passed through a through hole provided in a member of the wet clutch mechanism and is inserted into the through hole. A hydraulic clutch device characterized by being locked by contact with a ring plate provided on the outside.