JP2611541B2 - Transmission clutch device - Google Patents

Description

The present invention relates to a clutch device for a transmission.

(B) Conventional technology A conventional clutch device for a transmission is disclosed in Japanese Patent Application Laid-Open No. 2-3706.
There is one shown in Japanese Patent Publication No. The illustrated transmission clutch device has a clutch drum, a piston, and a wall member. The piston is axially movably fitted to the clutch drum to form a working pressure chamber therebetween, and the wall member is fixed to the clutch drum on the inner peripheral side and fits with the piston on the outer peripheral side. Together, they form a centrifugal oil pressure compensation chamber. The clutch drum is rotatably supported on a shaft part integral with or fixed to the casing of the transmission.

The centrifugal oil pressure compensation chamber is supplied through a wall member. That is, an oil collecting groove is provided on the surface of the wall member opposite to the side facing the centrifugal oil pressure compensation chamber, and the oil collecting groove and the centrifugal oil pressure compensation chamber are connected by an oil hole. The oil collecting groove collects the oil used for lubrication and the like that jumps to the outer periphery due to centrifugal force and sends it to the oil hole. This fills the centrifugal hydraulic compensation chamber with oil. The centrifugal force acts on the oil in the centrifugal oil pressure compensation chamber, which acts in the direction opposite to the force from the piston working pressure chamber, so that the hydraulic pressure generated by the centrifugal force acting on the oil in the working pressure chamber is canceled. . This prevents a problem that the clutch is half-engaged due to the centrifugal force acting on the oil remaining in the working pressure chamber.

(C) Problems to be Solved by the Invention However, the conventional transmission clutch device as described above requires a space for providing an oil collecting groove in a wall member, and also depends on operating conditions. However, there is a problem that the amount of oil scattered in the oil collecting channel is reduced, and the supply of oil to the centrifugal hydraulic compensation chamber becomes uncertain. That is, since the oil collecting groove is formed by providing the axial projection on the wall member having a predetermined thickness, the arrangement of the member adjacent to the wall member is restricted by this space. . In addition, if the lubricating oil amount is reduced or the rotation speed is low and the oil is not sufficiently scattered by the centrifugal force, the oil cannot be collected sufficiently by the oil collecting groove. A situation occurs where the room is not sufficiently filled with oil. An object of the present invention is to solve such a problem.

(D) Means for Solving the Problems The present invention solves the above problems by supplying oil supplied from the inner diameter side of the shaft portion supporting the clutch drum to the centrifugal hydraulic compensation chamber through the clutch drum. That is, the clutch device for a transmission according to the present invention includes a clutch drum (12), a piston (20), and a wall member (38), and the piston is movably fitted to the clutch drum in the axial direction. A working pressure chamber (22) is formed between the piston and the working pressure chamber, and the wall member is fixed to the clutch drum on the inner peripheral side thereof and fits with the piston on the outer peripheral side to face the opposite side of the piston from the operating pressure chamber. A centrifugal oil pressure compensation chamber (39) is formed at the center. The clutch drum is rotatably supported on a shaft (10) integral with or fixed to the casing of the transmission. An oil collecting groove (62) is provided on the inner diameter portion of the shaft portion, and a circumferential groove (27) for relaying an oil passage is provided on the outer diameter side of the shaft portion. The groove and the circumferential aromatic groove are connected by a hole (60) penetrating the shaft. The clutch drum has an oil hole (41) for communicating the circumferential groove of the shaft with the centrifugal oil pressure compensation chamber. Is provided. In addition, the code | symbol in a parenthesis shows the corresponding member of the Example mentioned later.

(E) Action Oil is collected by an oil collecting groove provided in the inner diameter portion of the shaft portion. Since the oil collecting groove is closer to the supply source of the oil scattered by the centrifugal force, a relatively large amount of oil can be reliably collected. The oil collected by the oil collecting groove reaches the circumferential groove through a hole passing through the shaft portion, and then flows into the centrifugal hydraulic compensation chamber through an oil hole provided in the clutch drum. Therefore, the centrifugal hydraulic compensation chamber can always be filled with oil. In addition, since the oil collecting groove is provided at a portion of the shaft portion that has not been particularly used, no extra space is required as compared with the case where the projection is provided on the wall member.

(F) Embodiment A clutch drum 12 is rotatably supported by a shaft portion 10 of an adapter member fixed to a casing (not shown). The clutch drum 12 has a shaft-like portion in a substantially hanging shape.
It has a shape in which a shaft supported by 10 is integrally formed. The shaft of the clutch drum 1 is rotatably supported on the shaft 10 via a bush 14. Clutch drum
A piston 20 is fitted to 12 so as to be movable in the axial direction. Working pressure chamber 22 between clutch drum 12 and piston 20
Is formed. The working pressure chamber 22 is connected to a circumferential groove 26 of the shaft 10 through a hole 24 provided in the shaft of the piston 20. The piston 20 has seal members 28 and 30 at an outer diameter portion and an inner diameter portion, respectively. The inner diameter portion of the outer cylindrical portion of the cup-shaped piston 20 is movably fitted to the outer diameter portion of the wall member 38. A return spring 46 is provided between the piston 20 and the wall member 38. The inner diameter side of the wall member 38 is fixed to the clutch drum 12 by a snap ring 37. The wall member 38 has a seal member 40 at an outer diameter portion. A centrifugal hydraulic compensation chamber 39 is formed between the piston 20 and the wall member 38. Centrifugal oil pressure compensation chamber 39 is clutch drum 12
The oil hole 41 communicates with the circumferential groove 27 of the shaft 10. The circumferential groove 27 is an oil collecting groove formed in the inner diameter of the shaft 10 by a hole 60 which reaches the inner diameter of the shaft 10.
Connected to 62. The right end of the piston 20 in FIG.
Between the snap ring 52 fixed to the clutch drum 12, a clutch plate group 54 is arranged. The clutch plate group 54 includes a plurality of alternately arranged inner spline clutch plates and outer spline clutch plates,
It is composed of a dish plate and a pressure plate. The outer spline clutch plate meshes with the inner spline of the clutch drum 12 and rotates integrally therewith, and the inner spline clutch plate meshes with the outer spline of the internal gear 56 and rotates integrally therewith.

Next, the operation of this embodiment will be described. Working pressure chamber
In a state where no hydraulic pressure is applied to the clutch 22, the piston 20 does not apply a pressing force to the clutch plate group 54, and the clutch is in a released state.

When the clutch is engaged, hydraulic pressure is applied to the working pressure chamber 22 through the circumferential groove 26 and the hole 24. Working pressure chamber
The hydraulic pressure of 22 causes the piston 20 to move rightward in FIG. 1 to exert a pushing force on the clutch plate group 54. As a result, the clutch is engaged. Due to the movement of the piston 20, the volume of the centrifugal hydraulic compensation chamber 39 is reduced, and a part of the oil filled therein is reduced to the oil hole 41, the circumferential groove 27 and the hole.
Discharged through 60.

Next, when the clutch is changed from the engaged state to the released state, the operating pressure in the operating pressure chamber 22 is released. In this way, the piston 20 is pushed back to the initial stop position by the force of the return spring 46. As a result, the volume of the centrifugal oil pressure compensation chamber 39 increases, but oil is immediately supplied. That is, oil supplied for lubrication from the rotation center portion side of the transmission scatters in the outer peripheral direction due to centrifugal force accompanying rotation of the rotating member. The oil scattered in this manner is caught by the oil collecting groove 62 and sent to the centrifugal hydraulic compensation chamber 39 through the hole 60, the circumferential groove 27 and the oil hole 41. Therefore, the oil sufficient to compensate for the increase in volume accompanying the movement of the piston 20 is supplied in a short time.

When the clutch drum 12 is rotated at a high speed in the clutch disengaged state, the clutch does not enter a semi-engaged state due to the hydraulic pressure generated by the centrifugal force. That is,
When the clutch drum 12 is rotated at a high speed, a centrifugal force acts on the oil in the working pressure chamber 22 and the oil in the centrifugal oil pressure compensation chamber 39.
Since the outer diameter of the centrifugal oil pressure compensation chamber 39 is substantially equal to the outer diameter of the working pressure chamber 22, the force acting on the piston 20 from the centrifugal oil pressure compensation chamber 39 side cancels the force acting from the working pressure chamber 22 side, No force acts on the clutch plate group 54.

(G) Effect of the Invention As described above, according to the present invention, the oil collected by the oil collecting groove provided on the shaft portion side is supplied to the centrifugal oil pressure compensation chamber. The required space is reduced compared to the case of forming an oil collecting groove, and oil is collected by the oil collecting groove located inside and having a large area, so that oil is reliably supplied to the centrifugal hydraulic compensation chamber. can do.

[Brief description of the drawings]

FIG. 1 is a diagram showing an embodiment of the present invention. 10: Shaft, 12: Clutch drum, 20: Piston, 22: Working pressure chamber, 38: Wall member, 39: Centrifugal hydraulic compensation chamber, 41: Oil hole, 27: Circumference Direction groove, 60 ... hole, 62
…… oil collecting groove.

Claims (1)

(57) [Claims] A clutch drum, a piston, and a wall member, wherein the piston is axially movably fitted to the clutch drum to form a working pressure chamber therebetween, and the wall member has The inner peripheral side is fixed to the clutch drum and fits with the piston on the outer peripheral side to form a centrifugal hydraulic compensation chamber on the side opposite to the working pressure chamber of the piston,
The clutch drum is a transmission clutch device rotatably supported on a shaft portion integral with or fixed to the casing of the transmission, wherein an oil collecting groove is provided on an inner diameter portion of the shaft portion. A circumferential groove for oil passage relay is provided on the outer diameter side of the shaft portion, and the oil collecting groove and the circumferential groove are connected by a hole penetrating the shaft portion, and the clutch drum is provided. A transmission clutch device, characterized in that the transmission clutch device is provided with an oil hole for communicating the circumferential groove of the shaft portion with the centrifugal oil pressure compensation chamber.