JP2005257032A - Clutch outer of multi-disk clutch - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a clutch outer less liable to generate a cast cavity or a rippled surface and capable of securing a centrifugal strength and a torsional strength over the entire length of fins by distributing stress against a centrifugal force and a torsional torque acting on the fins of the clutch outer. <P>SOLUTION: In this clutch outer of a multi-disk clutch, multiple sheets of friction plates and clutch plates in a stacked state are stored in a space between the clutch outer 11 in which a plurality of cutouts directed in the axial direction of a bottomed cylindrical body and cut out are formed in the circumferential direction and a clutch inner in which a plurality of grooves directed in the axial direction are formed in the outer peripheral surface in the circumferential direction, and the outer peripheral projected parts of the friction plates are fitted to the cutouts of the clutch outer and the inner peripheral projected parts of the clutch plates are fitted to the grooves of the clutch inner, and the friction plates and the clutch plates are pressed against each other by a pressing plate disposed on the opening end face side of the clutch outer to transmit a power. A continuous annular part 16 free from cutout is formed integrally with the opening end part of the clutch outer 11. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a clutch outer of a multi-plate clutch used in a power transmission system such as an internal combustion engine of a vehicle.

  The clutch outer of the multi-plate clutch has a shape in which a plurality of notches that are notched in the axial direction from the opening end surface of the bottomed cylindrical body are formed in the circumferential direction. A plurality of friction disks are alternately overlapped with and supported by the clutch disks with the outer peripheral protrusions of the disks being slidably fitted in the axial direction.

Since a plurality of notches are formed in the circumferential direction from the opening end face of the bottomed cylindrical body in the axial direction, a plurality of fins protrude in a comb shape from the outer periphery of the bottom portion in the axial direction. .
When the clutch outer rotates, centrifugal force acts on each fin.

Since each fin is in a cantilever support state in which one end is supported by the bottom and the other end is a free end, when a centrifugal force acts, a large bending moment is generated in the vicinity of the bottom that is the base of the fin.
Also, when a torsional torque is applied, a large bending moment is generated at the base of the fin.
In view of this, a configuration has been proposed in which a ring body is fitted to the outer peripheral surface of the cylindrical portion of the clutch outer so that the ring body supports the centrifugal force acting on each fin to distribute the stress (see Patent Document 1).

Japanese Utility Model Publication No. 62-20746

  Further, the ring body is separate from the clutch outer body, and the number of parts increases and the cost is increased. Therefore, as shown in FIG. 6, an annular portion corresponding to the ring body is formed integrally with the clutch outer body. Can be considered.

  The clutch outer 01 shown in FIG. 6 has a bottomed cylindrical body with a bottom portion 02 and a cylindrical portion 03. The bottom portion 02 has a circular hole through which a rotation shaft passes in the center, and the cylindrical portion 03 extends axially from the opening end face. By forming a plurality of deep cutouts 04 in the circumferential direction, a plurality of fins 05 project in a comb-tooth shape in the axial direction from the outer peripheral edge of the bottom.

An annular portion 06 is integrally formed in the circumferential direction along the outer peripheral surface in the middle excluding the tip portion and the root portion of each protruding fin 05.
The annular portion 06 can avoid the occurrence of a large bending moment at the base of each fin 05, and ensure the centrifugal strength and the torsional strength.

  As shown in FIG. 6, a notch 07 for fitting the outer peripheral protrusion of the outermost friction disk is formed at a slight depth at the tip of the fin 05 protruding from the annular portion 06. As a result, narrow projections 08 protrude on both sides, but bending moments are generated at the bases of the projections 08 and the portions protruding from the annular portion 06 of the fins 05 against the centrifugal force and torsional torque acting on the projections 08. .

Further, when the clutch outer 01 is formed by aluminum die casting, it is efficient that the gate is located in the annular portion 06 and the molten metal is filled from the annular portion 06.
FIG. 7 shows a cavity 010, a runner 011 and a gas vent passage 012 in the mold when the clutch outer 01 is formed by aluminum die casting.

A pouring gate 013 into the cavity 010 is disposed around the outer circumference of the portion corresponding to the annular portion 06 of the cavity 010, and the gas vent passage 012 extends from the other half circumference portion.
Therefore, the molten metal injected from the gate 013 into the cavity 010 through the runner 011 as shown by the arrow in FIG. The bottom part 02 and the tips of the fins 05 are spread over, and the downstream part 02 and the tips of the fins 05 are filled with the annular part 06 around the downstream half periphery.

FIG. 8 is a partial view showing the state of the molten metal in the cavity 010, and the flow of the molten metal is indicated by arrows.
As shown in FIG. 8, the protrusion 08 at the tip of the fin 05 has a bag structure in the cavity 010, so that the gas existing in the cavity 010 tends to accumulate before filling with molten metal, and a cast hole and a hot water wrinkle are generated. Easy to do.
Therefore, it is necessary to constantly monitor events such as castholes and hot water wrinkles.

  The present invention has been made in view of the above points. The object of the present invention is to distribute the stress to the centrifugal force and torsional torque acting on each fin of the clutch outer and to obtain the centrifugal strength and torsion over the entire length of the fin. The strength is ensured, and a clutch outer is provided which is less likely to cause a cast hole and a hot water wrinkle.

Means and effects for solving the problem

  In order to achieve the above object, the invention according to claim 1 is directed to a clutch outer in which a plurality of notches that are cut in the axial direction of a bottomed cylindrical body are formed in the circumferential direction and an axial direction on the outer circumferential surface. In the state where a plurality of friction disks and clutch disks are alternately stacked in a space between a plurality of grooves oriented in the circumferential direction, the outer circumferential protrusions of the friction disks The friction disc and the clutch disc are fitted by a presser plate that is fitted in the notch and has an inner peripheral projection of the clutch disc fitted in and inserted into a groove of the clutch inner and disposed on the opening end face side of the clutch outer. In a multi-plate clutch in which power is transmitted by being pressed together, a continuous annular portion without a notch is integrally formed at the open end of the clutch outer. Was was the clutch outer of the multi-plate clutch.

  Since a continuous annular portion without a notch is formed integrally with the opening end of the clutch outer, the opening end of the clutch outer has no portion protruding in the axial direction, and is cut off in the axial direction. A plurality of fins formed by notches are connected at their tips by an annular portion, and the centrifugal force and torsional strength are ensured over the entire length of the fin by dispersing stress against the centrifugal force and torsional torque acting on each fin. The

  Since the tips of the fins are connected by a continuous annular portion without a notch and there is no portion projecting in the axial direction, there is no bag structure when die casting is performed, and cast holes and hot water wrinkles are unlikely to occur.

  According to a second aspect of the present invention, in the clutch outer of the multi-plate clutch according to the first aspect, the clutch outer is cast and molded so that a hot water flow is generated in the circumferential direction of the annular portion.

  Since the annular part formed at the open end of the clutch outer is cast and molded so that a hot water flow is generated in the circumferential direction, the molten metal spreads smoothly and efficiently over the entire clutch outer, and it is difficult for castholes and hot water wrinkles to occur. Therefore, the quality control process can be greatly reduced.

  According to a third aspect of the present invention, in the clutch outer of the multi-plate clutch according to the first or second aspect, the outermost friction disk of the friction disk on the opening side of the clutch outer has an outer peripheral projection that is the cutout. It is characterized by fitting into a groove formed at a position offset in the circumferential direction with the notch.

  The outermost friction disk and other friction disks are fitted to the clutch outer at a position offset in the circumferential direction, so that the force acting between the friction disk and the clutch outer can be dispersed, and the outer periphery of the outermost friction disk By forming the groove into which the protrusion is fitted, the weight can be further reduced while ensuring the necessary strength of the annular portion.

An embodiment of the present invention will be described below with reference to FIGS.
A multi-plate clutch 10 according to the present embodiment is used in a power transmission system of a motorcycle, and is disposed at one end of a transmission main shaft 1 parallel to a crankshaft (not shown) that is rotationally driven by an internal combustion engine. Has been.

  A primary driven gear 2 that meshes with a primary drive gear (not shown) that is spline-fitted to the crankshaft is rotatably supported by a transmission main shaft 1 of a transmission via a bearing 3.

  The clutch outer 11 of the multi-plate clutch 10 forms a bottomed cylindrical body with a bottom portion 12 and a cylindrical portion 13, and a circular hole 12 a drilled in the center of the bottom portion 12 is rotatably fitted to the cylindrical base portion of the primary driven gear 2. In addition, the main shaft 1 is rotatably supported around the transmission main shaft 1 and is connected to the primary driven gear 2 via the damper spring 4 in the circumferential direction.

  2 and 3, the clutch outer 11 has a plurality of cutouts 14 formed in the circumferential direction in the cylindrical portion 13 so as to be cut off in the axial direction. , 14, a plurality of fins 15 oriented in the axial direction are arranged in an annular shape.

A continuous annular portion 16 having no notch is integrally formed at the opening end of the cylindrical portion 13.
Therefore, the tip portion of each fin 15 is connected by the annular portion 16.
On the inner peripheral surface of the annular portion 16, concave grooves 16 a continuous with the notches 14 in the axial direction and concave grooves 16 b cut out on the inner surfaces of the extension portions of the fins 15 are alternately formed in the circumferential direction.

A clutch inner 21 disposed inside the cylindrical portion 13 of the clutch outer 11 is spline-fitted to the transmission main shaft 1 and rotates integrally with the transmission main shaft 1.
The clutch inner 21 has a pressure receiving portion 22 facing the bottom portion 12 of the clutch outer 11 and a concentric cylindrical portion 23 facing the cylindrical portion 13. A groove 23a oriented in the axial direction is formed on the outer peripheral surface of the cylindrical portion 23. Are formed in the circumferential direction.

  A plurality of friction disks 25 and clutch disks 26 are alternately inserted into an annular space inside the cylindrical portion 13 of the clutch outer 11 and outside the cylindrical portion 23 of the clutch inner 21.

The friction disk 25 has an outer peripheral projection 25a that is slidably fitted in the notch 14 in the axial direction through the recessed groove 16a and the recessed groove 16a of the annular portion 16 of the clutch outer 11, and is integrated with the clutch outer 11. Rotate.
However, the outermost friction disk 25z to be inserted last is fitted in a groove 16b whose outer circumferential protrusion 25za is offset in the circumferential direction from the groove 16a of the clutch outer 11.

  In addition, the clutch disk 26 inserted alternately with the friction disk 25 has an inner peripheral protrusion 26a fitted in the groove 23a of the cylindrical portion 23 of the clutch inner 21 so as to be slidable in the axial direction, and integrated with the clutch inner 21. Rotate to.

  The pressure plate 30 is rotatably attached to the tip of a lifter rod (not shown) that is fitted into a hollow portion formed in the transmission main shaft 1, and the pressure plate 30 is moved to the outermost side by the spring force of the clutch spring 31. The friction disc 25z is pressed from the outside, and the friction disc 25 and the clutch disc 26, which are alternately inserted between the pressure receiving portions 22 of the clutch inner 21, are pressed so as to be sandwiched from both sides. The multi-plate clutch 10 is in an engaged state due to friction between them.

  The pressure of the friction disk 25 and the clutch disk 26 is released by sliding the lifter rod in the axial direction by hydraulic pressure and moving the pressure plate 30 attached to the tip in the axial direction against the spring force of the clutch spring 31. A gap is formed between the two and the multi-plate clutch 10 is disengaged.

  In the clutch outer 11 in such a multi-plate clutch 10, the tip portions of the fins 15 formed by the notches 14 into which the outer peripheral protrusions 25a of the friction disk 25 are fitted are connected by the annular portions 16, The both ends of 15 are connected to each other and are in a supported state, and the centrifugal strength is ensured over the entire length of the fins by dispersing stress against the centrifugal force acting on each fin 15 due to the rotation of the clutch outer 11.

  Similarly, even when torsional torque is applied to each fin, the stress is dispersed, and thus the torsional strength is ensured over the entire length of the fin.

  The clutch outer 11 is an aluminum die-cast molded product, and FIG. 4 shows a cavity 40, a runner 41, and a gas vent passage 42 in the mold when the clutch outer 11 is aluminum die-cast molded.

  As shown in FIG. 4, a gate 43 into the cavity 40 is disposed about the outer circumference of a portion corresponding to the annular portion 16 of the clutch outer 11 in the cavity 40, and the gas vent passage 42 extends from the other half circumference portion. I'm out.

  As shown by arrows in FIG. 4, the molten metal passes through the runner 41 and is injected into the cavity 40 from the gate 43, and the molten metal injected into the cavity 40 is annular at the tip of each fin 15 of the clutch outer 11. It flows into the half-circumference part on the side of the gate 43 (upstream side) of the part 16 and flows to the downstream side of the annular part 16, branches to the fins 15, flows to the bottom part 12, and reaches the entire circumference of the bottom part 12. After that, it flows through the fins 15 on the downstream side and joins at the downstream end of the annular portion 16 to fill the entire cavity 40.

FIG. 5 is a partial view showing the state of the molten metal in the cavity 40, and the flow of the molten metal is indicated by arrows.
A hot water flow is generated in the circumferential direction in the annular portion 16, and the molten metal branches to the fins 15 on the way and reaches the bottom portion 12.

  Since the annular part 16 is formed at the tip of each fin 15, a molten metal flow is generated in the circumferential direction in the annular part 16, and the molten metal spreads smoothly and efficiently over the entire cavity, there is no portion that becomes a bag structure, and gas is accumulated. A high-quality clutch outer 11 can be easily die-casted without the occurrence of casting holes or hot water wrinkles.

  Since the outermost friction disk 25z and the other friction disk 25 are engaged with the clutch outer 11 at a position offset in the circumferential direction, the force acting between the friction disks 25, 25z and the clutch outer 11 can be dispersed. The formation of the concave groove 16b into which the outer peripheral projection of the outermost friction disk 25z fits can further reduce the weight while ensuring the necessary strength of the annular portion 16.

1 is a cross-sectional view of a main part in which a multi-plate clutch provided with a clutch outer according to an embodiment of the present invention is applied to a motorcycle. It is a perspective view of this clutch outer. It is the same side view. It is explanatory drawing which showed the cavity in a metal mold | die at the time of carrying out the aluminum die-casting of the clutch outer, a runner, and a gas vent passage. It is a fragmentary figure which shows the state of the molten metal in the cavity of a metal mold | die. It is a perspective view of the conventional clutch outer. It is explanatory drawing which showed the cavity in a metal mold | die at the time of carrying out the aluminum die-casting of the clutch outer, a runner, and a gas vent passage. It is a fragmentary figure which shows the state of the molten metal in the cavity of a metal mold | die.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Shifting spindle, 2 ... Primary driven gear, 3 ... Bearing, 4 ... Damper spring,
10 ... multi-plate clutch, 11 ... clutch outer, 12 ... bottom, 13 ... cylindrical part, 14 ... notch, 15 ... fin, 16 ... annular part,
21 ... Clutch inner, 22 ... Pressure receiving part, 23 ... Cylindrical part, 25 ... Friction disk, 26 ... Clutch disk,
30 ... pressure plate, 31 ... clutch spring,
40 ... cavity, 41 ... runner, 42 ... gas vent, 43 ... pouring gate.

Claims (3)

Between a clutch outer in which a plurality of notches that are cut in the axial direction of the bottomed cylindrical body are formed in the circumferential direction and a clutch inner in which a plurality of axially directed grooves are formed in the circumferential direction on the outer peripheral surface. In the state where a plurality of friction plates and clutch plates are alternately stacked in the space, the outer peripheral protrusion of the friction plate is fitted into the notch of the clutch outer, and the inner peripheral protrusion of the clutch plate In a multi-plate clutch in which the friction plate and the clutch plate are pressed against each other by a press plate arranged on the opening end surface side of the clutch outer, and the power is transmitted.
A clutch outer of a multi-plate clutch, wherein a continuous annular portion without a notch is integrally formed at an opening end portion of the clutch outer.   The clutch outer of a multi-plate clutch according to claim 1, wherein the clutch outer is cast and molded so that a hot water flow is generated in a circumferential direction of the annular portion. 2. The outermost friction plate on the opening side of the clutch outer among the friction plates is fitted in a groove formed at a position where an outer peripheral projection is offset from the notch in the circumferential direction. The clutch outer of the multi-plate clutch according to claim 2.

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