JP2003287061A - Wet centrifugal clutch - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent or suppress occurrence of the slapping sound generated due to the collision of a support shaft with a weight by forming an oil supply path supplying lubrication oil to an insert hole of the weight inserted by the support shaft and reducing the wear of the contacting part between the support shaft and the weight without increasing the number of parts in a wet centrifugal clutch. <P>SOLUTION: The wet centrifugal clutch is equipped with the support shaft 3 provided on a drive plate 2 integrally rotating with a crank shaft, and the weight 4 pivotably supported by the support shaft 3 having the insert hole 40 inserted by the support shaft 3. The weight 4 consists of laminated board materials 41, 42. In the board material 42 with a groove, the groove 43 reaching the insert hole 40 is formed on the side surface 42b in the laminating direction and the oil supply path 44 is formed for supplying the lubrication oil pressurized by the centrifugal force to the insert hole 40 with the through-hole formed by the board material 41 covering the groove 43 and the groove 43 from the laminating direction. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wet centrifugal clutch which is used, for example, in a power transmission device of a vehicle and in which a torque of a rotating driving member is transmitted and cut off by a weight swinging in response to a centrifugal force. .

[0002]

2. Description of the Related Art Conventionally, as a centrifugal clutch of this type, there is one disclosed in Japanese Patent Publication No. 63-27586.
This wet centrifugal clutch includes a shaft (corresponding to a support shaft) provided on a plate member fixed to a drive shaft, and an inner (corresponding to a weight) having an insertion hole through which the shaft is slidably inserted. The inner is swingably supported on the shaft and swings in the radial direction by a centrifugal force generated by the rotation of the drive shaft. When the rotational speed of the drive shaft increases, the inner shaft that swings radially outward due to the generated centrifugal force frictionally engages with the outer arranged outside, so that the torque of the drive shaft is increased. Further, it is transmitted to the output shaft integrally connected to the clutch outer. The inner is composed of a plurality of laminated plate materials.

[0003]

By the way, in the above-mentioned prior art, the lubricating oil that has penetrated into the insertion hole of the inner member from the gap between the shaft and the inner member or the gap between the laminated plate materials reaches the insertion hole. However, these gaps are extremely small,
Since the flow resistance of the lubricating oil is large, the amount of oil that permeates the gaps and is supplied to the insertion holes is very small. In particular,
Since the intermediate portion of the insertion hole in the axial direction is located away from the exposed outer surface of the shaft, the flow resistance is further increased and the amount of oil supplied to the intermediate portion is further reduced. As a result, the contact portion between the shaft and the inner, which is a relatively sliding portion, may be worn, the gap between the two may be expanded, and a tapping sound may be generated due to a collision between the shaft and the inner.

The present invention has been made in view of such circumstances, and in the inventions according to claims 1 to 5, the support shaft is inserted in the wet centrifugal clutch without increasing the number of parts. By forming an oil supply passage for supplying lubricating oil to the insertion hole of the weight, the wear at the contact part between the support shaft and the weight is reduced, and it is possible to prevent or suppress the generation of hammering sound caused by the collision of both. To aim. The invention according to claim 2 further aims to supply pressurized lubricating oil to the insertion hole without increasing the number of parts, and the invention according to claim 3 further includes a support shaft and In order to reduce the wear at the contact portion with the weight, the purpose is to effectively supply the lubricating oil, and the invention according to claim 4 further forms the oil supply passage easily, and at the same time, inserts it into the insertion hole. For the purpose of facilitating adjustment of the supply amount and supply position of the lubricating oil, the invention according to claim 5 further supplies a required amount of lubricating oil to the contact surface between the input side rotating member and the weight. And to reduce wear on the contact surface.

[0005]

According to a first aspect of the present invention, there is provided an input side rotating member which rotates integrally with a drive member, a support shaft provided on the input side rotating member, and the support shaft. A weight that has an insertion hole through which the shaft is inserted and is slidably and swingably supported by the support shaft; and an output-side rotating member that swings around the support shaft in response to the generated centrifugal force. In a wet centrifugal clutch in which torque of the driving member is transmitted to and blocked from the output side rotating member by the moving weight, an oil supply path for supplying lubricating oil to the insertion hole uses a constituent member of the centrifugal clutch. It is the wet centrifugal clutch formed by.

This makes it possible to supply a required amount of lubricating oil from the viewpoint of reducing wear at the contact portion between the support shaft and the weight to the insertion hole through the oil supply passage, so that the support shaft and the weight are separated from each other. It is possible to reduce wear at the contact portion. Further, since the oil supply passage is formed by using the constituent members of the centrifugal clutch, it is not necessary to add a new member for forming the oil supply passage.

As a result, according to the invention of claim 1,
The following effects are exhibited. That is, the oil supply passage for supplying the lubricating oil to the insertion hole, through which the support shaft for swingably supporting the weight is inserted, is formed by using the constituent members of the wet centrifugal clutch. Lubricating oil can be supplied to the insertion hole to reduce the wear of the support shaft and the weight in the insertion hole, so that the increase in the gap between them can be prevented or suppressed, and the striking sound generated by the collision between the two can be prevented. The generation of noise based on is prevented or suppressed. Further, since the oil supply passage is formed by using the constituent members of the centrifugal clutch, the number of parts does not increase because the oil supply passage is formed.

According to a second aspect of the present invention, in the wet centrifugal clutch according to the first aspect, the lubricating oil in the oil supply passage is pressurized by the centrifugal force generated by the rotation of the input side rotating member and is inserted through the lubricating oil. It is supplied to the holes.

Since the lubricating oil in the oil supply passage is supplied to the insertion hole by utilizing the centrifugal force generated by the rotation of the input side rotating member, a pressurizing device for pressurizing the lubricating oil is unnecessary.

As a result, according to the invention of claim 2,
In addition to the effects of the invention according to claim 1, the following effects are exhibited. That is, the lubricating oil in the oil supply passage is pressurized by the centrifugal force generated by the rotation of the input side rotating member and supplied to the insertion hole, so that the lubricating oil is centrifugal force generated by the rotation of the input side rotating member. Since the pressure is applied by the pressurizing device, the pressurizing device is unnecessary, and therefore the structure of the centrifugal clutch is not complicated. Moreover, the pressurized lubricating oil can reliably supply the required amount of lubricating oil to the insertion hole.

According to a third aspect of the present invention, in the wet centrifugal clutch according to the first or second aspect, the constituent member is the weight, and the outlet of the oil supply passage is the insertion in the swing center line direction. It opens in the middle of the hole.

As a result, the lubricating oil is supplied through the oil supply passage to the intermediate portion of the insertion hole where it has been difficult to supply the required amount of lubricating oil from the viewpoint of wear reduction.

As a result, according to the invention of claim 3,
In addition to the effects of the invention described in the cited claims, the following effects are exhibited. That is, the constituent member is a weight, and the outlet of the oil supply passage is opened at an intermediate portion of the insertion hole in the swing center line direction of the weight, so that the oil passage is provided at the intermediate portion of the insertion hole from the viewpoint of reducing wear. Since the required amount of lubricating oil is supplied, the wear of the insertion hole is effectively reduced.

According to a fourth aspect of the present invention, in the wet centrifugal clutch according to the third aspect, the weight is composed of a plurality of laminated plate materials, and at least one of the plurality of plate materials.
The two plate members are grooved plate members in which a groove reaching the insertion hole is formed on the side surface in the stacking direction, and the oil supply passage is formed by the groove and the plate member covering the groove in the stacking direction. It consists of a through hole.

Since the oil supply passage is formed by laminating the grooved plate member and the plate member, the oil supply passage can be easily formed, and the stacking position of the grooved plate is changed, or By changing the number of grooved plates, it is possible to easily adjust the supply position or supply amount of the lubricating oil to the insertion hole.

As a result, according to the invention of claim 4,
In addition to the effect of the invention described in claim 3, the following effect is exhibited. That is, the weight is composed of a plurality of laminated plate materials, and at least one plate material of the plurality of plate materials is a grooved plate material in which a groove reaching the insertion hole is formed on the side surface in the stacking direction, and the oil supply passage is Since the groove and the plate material covering the groove from the stacking direction are formed as the through holes, the oil supply passage can be easily formed. In addition, the supply position or supply amount of the lubricating oil to the insertion hole can be easily adjusted by changing the stacking position of the grooved plate material or the number of plates, so that the wear of the contact portion between the support shaft and the weight is optimally reduced. be able to.

According to a fifth aspect of the present invention, in the wet centrifugal clutch according to the second aspect, the constituent members are the input side rotating member and the weight having contact surfaces contacting each other, and the oil supply passage is formed by the oil supply passage. A groove formed on the contact surface of at least one of the input side rotation member and the weight and reaching the insertion hole, and at least the input side rotation member and the weight covering the groove from the direction of the rotation axis of the drive member. The other is a through hole formed by the other.

As a result, the lubricating oil pressurized by the centrifugal force is supplied from the end of the insertion hole through the oil supply passage, and the contact surface between the input side rotating member and the weight is also worn through the oil supply passage. From the viewpoint of reduction, a required amount of lubricating oil is supplied, and wear at the contact portion between the input side rotating member and the weight is reduced.

As a result, according to the invention of claim 5,
In addition to the effect of the invention described in claim 2, the following effect is exhibited. That is, the constituent members are the input side rotating member and the weight having the contact surfaces that contact each other, and the oil supply passage is
By forming a groove that is formed in at least one of the input side rotating member and the weight and reaches the insertion hole and a through hole formed by at least the other of the input side rotating member and the weight that covers the groove in the axial direction, the input Since the required amount of lubricating oil can be supplied also to the contact surface between the side rotating member and the weight through the oil supply passage to reduce the wear at the contact surface between the two, the durability of the centrifugal clutch can be improved. .

In this specification, "radial direction" means a radial direction around the rotation axis of the driving member, and "axial direction" means the direction of the rotation axis of the driving member.

[0021]

1 to 5, a wet centrifugal clutch according to the present invention is used as a starting clutch which constitutes a power transmission device of a motorcycle equipped with an internal combustion engine. Another embodiment will be described.

FIGS. 1 to 3 are for explaining the first embodiment of the present invention. Referring to FIGS. 1 and 2, a wet centrifugal clutch C attached to a crankshaft 1 as a drive member of an internal combustion engine is oil-tightly coupled to a mission case accommodating a transmission (not shown) and the mission case. It is housed in a clutch chamber formed by a cover and at least a part of it is immersed in the lubricating oil in the clutch chamber.

The centrifugal clutch C is a drive plate 2 as an input side rotating member that rotates integrally with the crankshaft 1.
And a plurality of fixedly mounted drive plates 2.
For example, three support shafts 3 and insertion holes through which the support shafts 3 are inserted
40, a weight 4 slidably and swingably supported by the support shaft 3, a spring 5 for biasing the weight 4 radially inward, and a drive plate 2 radially outward.
And a clutch outer 6 as an output side rotating member which is located outside the drive plate 2 so as to cover each weight 4 and is rotatably supported by the crankshaft 1. Therefore, the drive plate 2, the support shaft 3, and the weight 4 are part of the constituent members of the centrifugal clutch C.

Each support shaft 3 is fixed to the drive plate 2 so as to be substantially parallel to the rotation axis L1 of the crankshaft 1. The weight 4 also has a lining 7 made of a friction material adhered to the outer peripheral surface thereof. Further, the bowl-shaped clutch outer 6 is fixed to a primary reduction drive gear 9 as a driven member that is rotatably supported on the crankshaft 1 via a needle bearing 8, and is integrated with the primary reduction drive gear 9. Rotate.

The centrifugal clutch C is in the disengaged state when the engine speed is equal to or lower than the predetermined speed, and is in the connected state when the engine speed exceeds the predetermined speed. Specifically, when the engine speed is equal to or lower than the predetermined speed, the centrifugal force generated in the weight 4 is small, and the stopper portion 4s of the weight 4 is the tubular portion of the drive plate 2 due to the elastic force of the spring 5. It is in the initial position where it abuts 2n. Therefore, the centrifugal clutch C applies the torque of the crankshaft 1 to the clutch outer 6
It will be in the cut-off state that will not be transmitted to. Then, when the engine speed exceeds the predetermined speed, the centrifugal force generated in each weight 4 increases, and the centrifugal force resists the weight 4 against the elastic force of the spring 5 and the center of the support shaft 3. The weight 4 is swung radially outward and the weight 4 is pressed against the inner peripheral surface of the clutch outer 6 via the lining 7. Therefore, centrifugal clutch C
Becomes a connected state in which the torque of the crankshaft 1 is transmitted to the clutch outer 6 due to the frictional force between the lining 7 and the clutch outer 6, and the drive plate 2 and the clutch outer 6 are integrated as the engine speed further increases. Fully connected to rotate to.

As described above, in the centrifugal clutch C, the torque transmission and interruption of the crankshaft 1 are transmitted and cut off by the weight 4 swinging around the support shaft 3 in accordance with the centrifugal force generated in the weight 4. Automatically according to.
Then, the torque of the crankshaft 1 is transmitted to the primary reduction drive gear 9 after the centrifugal clutch C is in the connected state, and is further transmitted from the primary reduction driven gear meshing with the primary reduction drive gear 9 to the speed change clutch, It is transmitted to the drive wheels (neither is shown) via the transmission and the secondary reduction mechanism.

Referring also to FIG. 3, each weight 4
Is a plurality of stacked plate members 41, 42, for example, five plate members 4
1, 42 are fixing means (not shown) such as welding or rivets
Are integrated and configured. The five plate materials 41, 42 are
Three basic plate members 41 without grooves 43, which will be described later,
It is composed of two grooved plate members 42 having grooves 43 formed by processing the basic plate member 41. The groove 43 is a single groove having a V-shaped cross section that reaches the insertion hole 40 from the inner peripheral surface 42a on the inner side (on the side of the rotation axis L1 of the crankshaft 1) in the radial direction of the grooved plate member 42, and is in the stacking direction. (In this embodiment, it coincides with the axial direction A.) and is formed on the side surface 42b opposite to the drive plate 2.

Further, the groove 43 is located in the region of the weight 4 inward of the insertion hole 40 in the radial direction in the swinging range of the weight 4, and extends substantially linearly in the radial direction. And
Preferably, when the centrifugal clutch C is in the fully connected state and the weight 4 is in the maximum swing position, the groove 43 is
In such a manner that the inner opening 43a that opens in the radial direction on the inner peripheral surface 42a and the outer opening 43b that opens in the insertion hole 40 in the radial direction are positioned so as to extend in line with the radial direction. Is formed.

When all the plate materials 41 and 42 are laminated,
43 is covered from the stacking direction by the base plate member 41 facing the side surface 42b in which the groove 43 is formed adjacent to the grooved plate member 42 in the axial direction A. In this way, the grooved plate 42 and the basic plate
In cooperation with 41, the weight 4 is formed with a through hole reaching the insertion hole 40 from the inner peripheral surface 4a.
An oil supply passage 44 is formed in which an inlet 44a formed by the inner opening 43a opens in the inner peripheral surface 42a and an outlet 44b formed by the outer opening 43b opens in the insertion hole 40.

Each oil supply passage 44 is located radially inward of the insertion hole 40 in the entire swing range of the weight 4 defined by the initial position and the maximum swing position, and is linear in the radial direction. Since the drive plate 2 is rotating, the lubricating oil flowing from the inlet 44a and present in the oil supply passage 44 is directed toward the outlet 44b by the centrifugal force generated by the rotation of the drive plate 2 when the drive plate 2 is rotating. Flow. Then, the lubricating oil pressurized by the centrifugal force is supplied to the insertion hole 40 and is supplied to the contact portion between the supporting shaft 3 and the weight 4 which slide relatively.

Further, each oil supply passage 44 extends in the direction along the swing center line L2 which is also the center axis of the support shaft 3 (in this embodiment,
It coincides with the axial direction A and is hereinafter referred to as the "swing center line direction". ), An opening is made in the middle portion of the insertion hole 40, that is, in a portion excluding the openings 40a and 40b at both ends of the insertion hole 40 in the swing center line direction. Therefore, in the contact portion between the support shaft 3 and the weight 4, it is separated from the exposed outer surface of the support shaft 3 and the weight 4 assembled together, and a small amount between the support shaft 3 and the insertion hole 40. From the gap, a required amount of lubricating oil from the viewpoint of wear reduction is supplied through the oil supply passage 44 to the middle portion in the swing center line direction where the lubricating oil is difficult to supply due to its large flow resistance. .

In the middle portion of the insertion hole 40 (thus also the middle portion of the contact portion between the support shaft 3 and the weight 4), the lubricating oil is fed from the minute gap between the support shaft 3 and the insertion hole 40. Of the insertion hole 40 that is extremely difficult to supply
In order to supply the lubricating oil near c, in this embodiment, 5
In the two plate members 41 and 42, the basic plate member 41 is arranged at the end of the weight 4 in the stacking direction, and as a whole, the basic plate member 41 and the grooved plate member 42 are alternately stacked to form the weight 4, and thereby the swing member 4 is formed. The oil supply passages 44 are arranged on both sides of the central portion 40c of the insertion hole 40 in the dynamic center line direction with the central portion 40c interposed therebetween.

Further, the groove 43 is formed in the basic plate material 41 formed by press working by pressing, simultaneously with the processing of the basic plate material 41 or subsequent to the processing.

Next, the operation and effect of the first embodiment configured as described above will be described. When the internal combustion engine is operated, the drive plate 2 of the centrifugal clutch C rotates integrally with the crankshaft 1, and when the engine speed exceeds the predetermined speed, the centrifugal clutch C is connected to drive the motorcycle. The torque of the crankshaft 1 is transmitted to the wheels.

At this time, the weight 4 of the centrifugal clutch C rotates together with the drive plate 2, and the oil supply passage 44 for supplying the lubricating oil to the insertion hole 40 through which the support shaft 3 for swingably supporting the weight 4 is inserted. Since the weight 4 is formed, a required amount of lubricating oil from the viewpoint of reducing wear at the contact portion between the support shaft 3 and the weight 4 is inserted through the oil supply passage 44.
The wear of the support shaft 3 and the weight 4, which is a relatively sliding portion, in the insertion hole 40 can be reduced, so that the increase in the gap between them can be prevented or reduced. As a result, the generation of noise based on the tapping sound generated by the collision between the two is prevented or suppressed. Further, since the oil supply passage 44 is formed by using the weight 4 which is a constituent member of the centrifugal clutch C, the number of parts for forming the oil supply passage 44 does not increase.

The lubricating oil in the oil supply passage 44 is the drive plate 2
The lubricating oil is pressurized by the centrifugal force generated by the rotation and is supplied to the insertion hole 40, so that the lubricating oil is pressurized by the centrifugal force generated by the rotation of the drive plate 2. The pressure device is not required, and the structure of the centrifugal clutch C does not become complicated. Moreover, the pressurized lubricating oil can reliably supply the required amount of lubricating oil to the insertion hole 40.

Further, the oil supply passage 44 is formed so as to extend in a direction coinciding with the radial direction when the weight 4 is in the maximum swing position in an operating range where the engine speed exceeds the predetermined speed. As a result, the direction of the oil supply passage 44 and the direction of the centrifugal force can be made to coincide with each other, so that the large centrifugal force generated in the rotation range can be utilized to the maximum extent to increase the degree of pressurization of the lubricating oil and to increase the lubricating oil. Can be made to flow smoothly, and the amount of oil to the insertion hole 40 can be increased.

The outlet 44 of the oil supply passage 44 formed in the weight 4
By opening b in the middle of the insertion hole 40 in the swing center line direction of the weight 4, preferably in the vicinity of the central portion 40c of the insertion hole 40, conventionally, a required amount of lubricating oil from the viewpoint of wear reduction is provided. Since the required amount of lubricating oil from the viewpoint of wear reduction is supplied to the middle portion of the insertion hole 40, which was difficult to supply, especially near the central portion 40c, the wear of the insertion hole 40 is effective. Is reduced.

The weight 4 is composed of a plurality of laminated plate members 41,
At least one plate member of the plurality of plate members 41, 42 is a grooved plate member 42 in which a groove 43 reaching the insertion hole 40 is formed on the side surface 42b in the stacking direction, and the oil supply passage 44 is
By forming the through hole formed by the groove 43 and the basic plate member 41 covering the groove 43 from the stacking direction, the oil supply passage 44 is formed by stacking the basic plate member 41 and the grooved plate member 42. As a result, the oil supply passage 44 is easily formed. Moreover, by changing the stacking position of the grooved plate members 42, the supply position of the lubricating oil to the insertion hole 40 can be easily adjusted, and by changing the number of the grooved plate members 42,
Since the amount of lubricating oil supplied to the insertion hole 40 can be easily adjusted,
It is possible to optimally reduce the wear of the contact portion between the support shaft 3 and the weight 4. Further, the groove 43 is formed on the side surface 42 of the grooved plate member 42.
Since the b is formed by pressing, the groove can be easily formed.

Further, since the oil supply passage 44 is constituted by the through hole, the lubricating oil can be reliably supplied to the insertion hole 40 without being scattered by centrifugal force in the middle of the oil supply passage 44.

Next, a second embodiment of the present invention will be described with reference to FIGS. The second embodiment is different from the first embodiment in that the groove is formed in the drive plate 2 instead of the plate material constituting the weight 4, and the other configurations are basically the same. . Therefore, a description of the same parts will be omitted or simplified, and different points will be mainly described. The same reference numerals are used for the same or corresponding members as those of the first embodiment.

With the weight 4 assembled to the drive plate 2, the drive plate 2 and the basic plate material 41 of the weight 4 adjacent to the drive plate 2 in the axial direction A are shown.
₁ and has a side which contacts facing each other in the axial direction A, i.e. the contact surface 2a, 41 _{1 a.} On the contact surface 2a of the drive plate 2, a single groove 21 having a rectangular cross section is formed for each support shaft 3, reaching the insertion hole 40 from a portion closer to the crankshaft 1 in the radial direction. Each groove 21 has a through hole 40 in the radial direction.
While being located in a region more inward than the insertion hole 40, that is, the inner opening 21a located radially inward of the insertion hole 40 and the outside opening at the end of the insertion hole 40 so as to extend in the direction that matches the radial direction. The opening 21b is formed so as to be located on a straight line in the radial direction.

The groove 21 has a weight 4 on the drive plate 2.
In a state that is assembled, it is covered from the axial direction A by the basic plate 41 ₁ of the weight 4. As described above, the drive plate 2 and the weight 4 cooperate to form a through hole that reaches the end of the insertion hole 40 from a position radially inward of the insertion hole 40. An inlet 22a formed by 21a is opened at a position radially inward of the insertion hole 40, and an outlet 22b formed by an outer opening 21b is formed at an end opening 40b of the insertion hole 40, thereby forming an oil supply passage 22. To be done.

Since each oil supply passage 22 extends linearly in the radial direction, when the drive plate 2 is rotating,
The lubricating oil flowing from 22a and existing in the oil supply passage 22 flows toward the outlet 22b due to centrifugal force. Then, the lubricating oil pressurized by the centrifugal force is supplied from the end of the insertion hole 40 to the contact portion between the supporting shaft 3 and the weight 4 which slide relatively, and the drive plate 2 which slides further relatively. And weight 4
It is supplied to the contact surfaces 2a, 41 _{1 a} with.

According to the second embodiment, the same operation and effect as those of the first embodiment are obtained except the operation and effect related to the formation of the oil supply passage 22 in the weight 4. The action and effect of That is, the oil supply passage
The groove 22 is formed in the drive plate 2 and reaches the insertion hole 40, and the through hole formed by the weight 4 that covers the groove 21 in the axial direction A.
Through the addition to the lubricating oil pressurized by the centrifugal force from the end opening 40b of the insertion hole 40 is supplied to the contact surfaces 2a, 41 _{1 a} of the base plate 41 ₁ of the drive plate 2 and the weight 4, refueling through road 22, and the required amount of lubricating oil in terms of both wear reduction of is supplied, it is possible to reduce wear on both the contact surfaces 2a, 41 _{1 a,} improve the durability of the centrifugal clutch C Can be made.

In the following, an example in which a part of the configuration of the above-mentioned example is modified will be described.
Although the number of the grooved plate members 42 is two in the first embodiment, at least one plate member forming the weight 4 is a grooved plate member.
42 is enough. The number of plate members 41, 42 forming the weight 4 may be any number other than five. Further, the stacking position of the grooved plate members 42 does not have to be a position where they are alternately stacked with the base plate member 41. For example, the grooved plate members 42 may be stacked adjacent to each other. The plate member may be the grooved plate member 42.

The weight 4 may be composed of a single block instead of being laminated, and in this case, the through hole which constitutes the oil supply passage has an inner circumference of the weight. It is formed by a processing means such as machining so as to reach the insertion hole 40 from the surface.

The groove 44 is formed on the side surface 42b of the grooved plate 42 on the side opposite to the drive plate 2 in the axial direction A, but the side surface 42c on the drive plate 2 side (see FIGS. 1 and 2).
(Refer to FIG. 4), and may be formed on both side surfaces 42b and 42c. The formation directions of the grooves 44, 22 may be deviated from the direction corresponding to the radial direction as long as the lubricating oil is supplied by the centrifugal force. Also, the grooved plate material 42
A plurality of grooves 43, 21 may be formed in the drive plate 2, and a plurality of oil supply passages 44, 22 may be formed by these grooves.

In the second embodiment, the groove 21 is formed on the contact surface 2a of the drive plate 2, but not on the contact surface 2a,
A groove may be formed in the contact surface 41 ₁ a of the weight 4 that contacts the contact surface 2 a, and further, the contact surface 2 a and the contact surface 41 ₁ a may be formed.
The grooves may be formed in both of them, and one oil supply passage may be formed by the cooperation of both grooves. Similarly, also in the first embodiment,
Grooves are formed on both side surfaces of the two plate members adjacent to each other in the stacking direction, which face each other.
One oil supply passage may be formed.

Further, by combining the first and second embodiments, the oil supply passage 44 is formed between the plate members 41 and 42 of the weight 4, and the oil supply passage 22 is also formed between the drive plate 2 and the weight 4. May be formed.

In each of the above embodiments, the centrifugal clutch was used as the starting clutch of the power transmission device for the motorcycle, but it can also be used for vehicles other than motorcycles, and for equipment other than vehicles. It can also be used in power transmission devices.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of the wet centrifugal clutch according to the present invention, taken along the line II of FIG. 2, showing the first embodiment of the present invention and applied to a starting clutch of a power transmission device for a motorcycle.

FIG. 2 is a sectional view taken along line II-II of FIG.

3 is a partial exploded perspective view of the centrifugal clutch of FIG.

FIG. 4 shows a second embodiment of the present invention, and FIG.
It is an exploded perspective view corresponding to.

FIG. 5 is a cross-sectional view of an essential part of a diagram corresponding to FIG. 1 of the first example of the second example of the present invention.

[Explanation of symbols]

1 ... Crank shaft, 2 ... Drive plate, 2a ... Contact surface,
3 ... Support shaft, 4 ... Weight, 5 ... Spring, 6 ... Clutch outer, 7 ... Lining, 8 ... Needle bearing, 9 ...
Primary reduction drive gear, 21 ... Groove, 22 ... Supply path, 40 ... Insertion hole,
41 ... Basic plate material, 41 ₁ a ... Contact surface, 42 ... Grooved plate material, 43 ...
Groove, 44 ... Oil supply passage, 44b ... Exit, C ... Centrifugal clutch, L1 ...
Rotation axis, L2 ... swing center line, A ... axial direction.

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Hidemi Yokoyama             1-4-1 Chuo Stock Market, Wako City, Saitama Prefecture             Inside Honda Research Laboratory F term (reference) 3J068 AA01 AA05 BA14 BB06 CA02                       CB03 DD04 GA05 GA09

Claims (5)

[Claims] 1. An input-side rotating member that rotates integrally with a drive member, a support shaft provided on the input-side rotating member, and an insertion hole through which the support shaft is inserted. Two weights that are swingably supported and an output side rotation member, and the weight that swings around the support shaft in response to a generated centrifugal force causes the drive member to move toward the output side rotation member. A wet centrifugal clutch in which torque is transmitted and cut off, wherein an oil supply path for supplying lubricating oil to the insertion hole is formed by using a constituent member of the centrifugal clutch. 2. The wet oil according to claim 1, wherein the lubricating oil in the oil supply passage is pressurized by a centrifugal force generated by the rotation of the input side rotating member and is supplied to the insertion hole. Centrifugal clutch. 3. The composition member is the weight, and the outlet of the oil supply passage is opened at an intermediate portion of the insertion hole in the swing center line direction. Wet centrifugal clutch. 4. The weight is composed of a plurality of laminated plate materials, and at least one plate material of the plurality of plate materials is a grooved plate material having a groove reaching the insertion hole on a side surface in the stacking direction. The wet centrifugal clutch according to claim 3, wherein the oil supply passage comprises a through hole formed by the groove and the plate material covering the groove from the stacking direction. 5. The component members are the input side rotating member and the weight having contact surfaces that contact each other, and the oil supply passage is formed on the contact surface of at least one of the input side rotating member and the weight. And a through hole formed by at least the other of the weight and the input side rotating member covering the groove from the direction of the rotation axis of the driving member. Item 2. The wet centrifugal clutch according to item 2.