JP3124478U - Drag torque reduction structure of wet dual clutch pack - Google Patents

Abstract

A structure for reducing drag torque generated in a wet dual clutch pack is provided.
In a wet dual clutch 10 in which first and second wet multi-plate clutches K1 and K2 are concentrically arranged in the radial direction, the first hub 104 of the first clutch K1 radially outward extends in the radial direction. The grooves 106a and 206a are provided in the radial direction on the side surface 106 and / or the side surface 206 extending in the radial direction of the second hub 204 of the second clutch K2 on the radially inner side to improve the discharge performance of the circulating cooling oil. Thus, the drag torque is reduced.
[Selection] Figure 1

Description

  The present invention relates to a drag torque reduction structure for a wet dual clutch pack used in a vehicle transmission or the like.

As a conventional wet dual clutch pack structure, as shown in FIG. 1, the first and second wet multi-plate clutches K1 and K2 are concentrically arranged in the radial direction. There is a wet dual clutch pack 10 to which a storage structure is applied.
JP 2004-53020 A JP 2004-169917 A

In the wet dual clutch pack 10 of FIG. 1, the outer peripheral side of the front cover 200 is fixed to the rear cover 100 via the snap ring 300 so that it does not open in the axial direction at the right end of the stepped cup-shaped rear cover 100.
The first clutch K1 that is operated by the piston 102 is disposed radially outward, and the second clutch K2 that is operated by the piston 202 is disposed in the inner drum 201, that is, radially inward.

In the wet dual clutch pack 10 of FIG. 1, the torque transmission path is as shown in FIG.
First, as shown in FIG. 2 (a), K1 torque transmission takes a path of K1 torque input → front cover 200 → rear cover 100 → first hub 104 → K1 torque output.
Next, as shown in FIG. 2B, the K2 torque transmission takes a path of K2 torque input → front cover 200 → rear cover 100 → inner drum 201 → second hub 204 → K2 torque output.

  In the wet dual clutch pack, different torque transmission paths can be obtained in accordance with the two types of clutches used, so multiple shifts can be made from the start by simply changing gears without using a torque converter. There are features that are possible.

  By the way, in the wet dual clutch pack, in order to cope with the heat generation in the friction engagement portions of the first and second wet multi-plate clutches K1 and K2, generally, the lubricating oil is pumped to the axial center position of the wet dual clutch pack. It uses a cooling structure that feeds and circulates in the radial direction by centrifugal force, collects it, and circulates it.

  As described above, since the lubricating oil for cooling circulates in the wet dual clutch pack, between the two members that rotate relatively at a small interval, the so-called "Drag torque" is generated. “Drag torque” only wastes valuable driving force as wasted thermal energy and should be eliminated as much as possible.

  As the “two members relatively rotating at a narrow interval”, the problem in FIG. 1 is the two locations shown by the set of points in FIG. A side surface 206 extending between the side surface 106 extending in the radial direction of the first hub 104 of the first clutch K1 and the front cover 200 and secondly extending in the radial direction of the second hub 204 of the second clutch K2 radially inward. And the side wall 108 extending in the radial direction of the first hub 104.

The present invention relates to a wet dual clutch in which the first and second wet multi-plate clutches K1 and K2 are concentrically arranged in the radial direction.
A radial groove is provided on a side surface extending in the radial direction of the first hub of the first clutch K1 on the radially outer side and / or a side surface extending in the radial direction of the second hub of the second clutch K2 on the radially inner side. The above problem has been solved by the drag torque reduction structure of the wet dual clutch pack.

  According to the present invention, the discharge performance of the circulating cooling oil can be improved by the grooves provided in the radial direction at the location, so that the “drag torque” that has conventionally occurred at the location can be reduced. .

  Hereinafter, an embodiment of the present invention will be described with reference to FIGS. 3 is a right side view of the first hub 104, and FIG. 4 is a right side view of the second hub 204.

  In the present invention, as shown in FIGS. 3 and 4, the side surface 106 extending in the radial direction of the first hub 104 of the first clutch K1 and / or the side surface 206 extending in the radial direction of the second hub 204 of the second clutch K2 are provided. The grooves 106a or 206a are provided in the radial direction. Although the number of the grooves is not limited, FIGS. 3 and 4 show a case where a total of eight grooves are provided every 45 degrees in the circumferential direction.

  By providing such a groove 106a or 206a for passing the lubricating oil, the cooling lubricating oil that has been conventionally only pushed into a narrow space as shown in FIG. 1 is easily discharged radially outward. . As a result, it is possible to reduce drag torque between the first hub and the front cover and / or between the first hub and the second hub in the wet dual clutch pack.

  Note that the present invention can be implemented simply by forming a groove on the radial side surface 106 or the radial side surface 206 of the second hub 204 which is a part of the first hub 104 of the conventional wet dual clutch pack. This can be carried out without changing the basic structure of the wet dual clutch pack.

Sectional drawing of the axial direction of the wet dual clutch pack which applied the conventional and this invention. FIGS. 2A and 2B are diagrams showing torque transmission paths in the case of FIG. 1, where FIG. The right view of the 1st hub to which this invention is applied. The right view of the 2nd hub to which this invention is applied.

Explanation of symbols

10: Wet dual clutch pack 104: First hub 106: Side surface extending in the radial direction 106a: Groove 204: Second hub 206: Side surface extending in the radial direction 206a Groove K1: First clutch K2: Second clutch

Claims (1)

In the wet dual clutch in which the first and second wet multi-plate clutches K1, K2 are concentrically arranged in the radial direction,
A radial groove is provided on a side surface extending in the radial direction of the first hub of the first clutch K1 on the radially outer side and / or on a side surface extending in the radial direction of the second hub of the second clutch K2 on the radially inner side. And
Drag torque reduction structure of wet dual clutch pack.

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