Power transmission device

Abstract

A power transmission device is provided which can easily and correctly install a first spherical member and a second spherical member on a counterweight member and can reduce manufacturing costs. The centrifugal clutch unit (9) comprises: a retaining member (11); a pressing member (12); a first spherical member (14) having a portion protruding from an opening (10aa) on one side and capable of rolling in contact with a rolling surface of the pressing member (12); and a second spherical member (15) having a portion protruding from an opening (10ab) on the other side and capable of rolling in contact with a rolling surface of the retaining member (11), wherein the through hole (10a) is formed into a tapered shape from the opening (10aa) on one side to the opening (10ab) on the other side, and the first spherical member (14) is prevented from falling off by the outer peripheral edge of the opening with a smaller diameter in the opening (10aa) on the one side and the opening (10ab) on the other side.

Description

Technical Field

[0001] The present invention relates to a power transmission device capable of arbitrarily transmitting or interrupting the rotational force of an input member to an output member. Background Art

[0002] Generally speaking, a power transmission device of a two-wheeled motor vehicle is used to arbitrarily transmit or cut off the driving force of the engine to the transmission and the drive wheel. It has an input member connected to the engine side, an output member connected to the transmission and the drive wheel side, a clutch member connected to the output member, and a pressure member that can approach or move away from the clutch member. The structure is as follows: by bringing the pressure member close to the clutch member, the driving side clutch plate and the driven side clutch plate are pressed together to transmit power, and by moving the pressure member away from the clutch member, the pressing force between the driving side clutch plate and the driven side clutch plate is released to cut off the power transmission.

[0003] As a conventional power transmission device, for example, as disclosed in Patent Document 1, a centrifugal clutch unit having a weight member is proposed, and the weight member is moved from the inner diameter side position of the groove portion to the outer diameter side position by the centrifugal force accompanying the rotation of the clutch housing, so that the driving side clutch plate and the driven side clutch plate can be pressed into contact. According to this conventional power transmission device, the clutch housing rotates with the drive of the engine, and centrifugal force can be applied to the weight member, so that the driving side clutch plate and the driven side clutch plate can be pressed into contact, and the driving force of the engine can be transmitted to the wheels.

[0004] Prior art literature

[0005] Patent Literature

[0006] Patent Document 1: International Publication No. 2013 / 183588 Summary of the invention

[0007] Problems to be solved by the invention

[0008] However, the above-mentioned conventional power transmission device requires a relatively large moving space for the steel balls because the weight component is composed of steel balls, and the device may be large-scale. Therefore, the applicant has studied to miniaturize the device by using a weight component in the shape of a shogi piece (block) with a front and back surface. However, in this case, in order to smoothly move the weight component, the following structure has been studied: a through hole is formed in the weight component through which a pair of spherical components (a first spherical component and a second spherical component) can be inserted, and a part of the first spherical component protrudes from an opening on one side of the through hole, and a part of the second spherical component protrudes from an opening on the other side.

[0009] According to this structure, when centrifugal force is generated accompanying the rotation of the clutch housing, the weight member can be smoothly moved from the inner diameter side position to the outer diameter side position by rolling of the first spherical member and the second spherical member. However, when such a weight member is used, for example, it is necessary to tighten the opening edge of one side of the insertion hole to prevent the first spherical member from falling out, and tighten the opening edge of the other side to prevent the second spherical member from falling out, so there is a problem that the workability is deteriorated and the manufacturing cost increases.

[0010] The present invention has been made in view of the above circumstances, and provides a power transmission device capable of easily and accurately attaching a first spherical member and a second spherical member to a weight member and capable of reducing the manufacturing cost.

[0011] Means for solving problems

[0012] The invention described in scheme 1 is a power transmission device, comprising: a clutch housing, which rotates together with an input member rotated by the driving force of the engine of the vehicle and is equipped with a plurality of driving side clutch plates; a clutch member, which is equipped with a plurality of driven side clutch plates formed alternately with the driving side clutch plates of the clutch housing and is connected to an output member capable of rotating the wheels of the vehicle; a pressure member, which can move between an operating position and a non-operating position, wherein the operating position is a position in which the driving side clutch plates and the driven side clutch plates are pressed into contact with each other to set the state in which the driving force of the engine can be transmitted to the wheels, and the non-operating position is a position in which the pressing force between the driving side clutch plates and the driven side clutch plates is released to cut off the transmission of the driving force of the engine to the wheels; and a centrifugal clutch unit, which comprises a weight member that can move from an inner diameter side position to an outer diameter side position by the centrifugal force accompanying the rotation of the clutch housing, and when the weight member is in the outer diameter side position, the driving side clutch plates and the driven side clutch plates are pressed into contact with each other to set the state in which the driving force of the engine can be transmitted to the wheels. The wheel is pressed against the driven side clutch plate by the counterweight member, and the wheel is pressed against the driven side clutch plate by the counterweight member, and the wheel is pressed against the driven side clutch plate by the counterweight member, and the wheel is pressed against the driven side clutch plate by the counterweight member, and the wheel is pressed against the driven side clutch plate by the counterweight member, and the wheel is pressed against the driven side clutch plate by the counterweight member, and the wheel is pressed against the driven side clutch plate by the counterweight member, and the wheel is pressed against the driven side clutch plate by the counterweight member, and the wheel is pressed against the driven side clutch plate by the counterweight member, and the wheel is pressed against the driven side clutch plate The clutch plate on the dynamic side and the clutch plate on the passive side are crimped; a first spherical member, a portion of which protrudes from an opening on one side of a through hole formed in the counterweight member so as to be able to roll in contact with the rolling surface of the crimping member; and a second spherical member, a portion of which protrudes from an opening on the other side of the through hole formed in the counterweight member so as to be able to roll in contact with the rolling surface of the retaining member, the through hole being formed in a tapered shape from the opening on one side to the opening on the other side, and the first spherical member being prevented from falling off by the outer peripheral edge portion of the small-diameter opening in the opening on one side and the opening on the other side.

[0013] The invention described in Scheme 2 is based on the power transmission device described in Scheme 1, characterized in that the first spherical member and the second spherical member are composed of spherical members with diameters different from each other corresponding to the inner diameter of the through hole, and can roll in contact with the inner peripheral surface of the through hole.

[0014] The invention described in claim 3 is the power transmission device described in claim 1 or 2, characterized in that the second spherical member is prevented from coming off by the rolling surface of the retaining member or the pressure contact member.

[0015] The invention described in claim 4 is the power transmission device described in claim 3, characterized in that the rolling surface of the retaining member and / or the pressing member is formed in a groove shape along the moving direction of the weight member.

[0016] Effects of the Invention

[0017] According to the invention of Scheme 1, since the through hole of the counterweight component in the centrifugal clutch unit is formed into a cone from the opening on one side to the opening on the other side, and the first spherical component is prevented from falling off by the outer peripheral edge portion of the small-diameter opening in the opening on one side and the opening on the other side, the first spherical component can be easily and correctly installed on the counterweight component, which can reduce the manufacturing cost.

[0018] According to the invention of Scheme 2, since the first spherical component and the second spherical component are composed of spherical components with diameters different from each other corresponding to the inner diameter of the through hole, they can roll in contact with the inner circumferential surface of the through hole. Therefore, when the counterweight component moves, the first spherical component and the second spherical component can roll stably, and smooth movement can be achieved.

[0019] According to the invention of claim 3, since the second spherical member is prevented from coming off by the rolling surface of the holding member or the pressing member, the first spherical member and the second spherical member can be easily prevented from coming off.

[0020] According to the invention of Scheme 4, since the rolling surface of the retaining member and / or the crimping member is composed of a groove shape along the moving direction of the counterweight member, the second spherical member on the large-diameter opening side and the first spherical member on the small-diameter opening side can be reliably prevented from falling off and smoother movement of the counterweight member can be achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is an external view showing a power transmission device according to an embodiment of the present invention.

[0022] Figure 2 yes Figure 1 Sectional view along line II-II.

[0023] Figure 3 yes Figure 1 Sectional view along line III-III.

[0024] Figure 4 It is a perspective view showing a clutch housing in the power transmission device according to the embodiment of the present invention.

[0025] Figure 5 It is a three-view diagram showing a first clutch member in the power transmission device according to the embodiment of the present invention.

[0026] Figure 6It is a perspective view showing a first clutch member in the power transmission device according to the embodiment of the present invention.

[0027] Figure 7 It is a three-view diagram showing a second clutch member in the power transmission device according to the embodiment of the present invention.

[0028] Figure 8 It is a perspective view showing a second clutch member in the power transmission device according to the embodiment of the present invention.

[0029] Fig. 9 It is three-view drawing which shows the pressure member in the power transmission device which concerns on embodiment of this invention.

[0030] Fig.10 It is a perspective view showing a pressure member in the power transmission device according to the embodiment of the present invention.

[0031] Fig.11 It is a longitudinal sectional view showing a centrifugal clutch unit in the power transmission device according to the embodiment of the present invention.

[0032] Fig.12 It is a partially cutaway perspective view showing a centrifugal clutch unit in the power transmission device according to the embodiment of the present invention.

[0033] Fig.13 It is a three-view diagram showing a holding member constituting a centrifugal clutch unit in the power transmission device according to the embodiment of the present invention.

[0034] Fig.14 It is a three-view diagram showing a support member constituting a centrifugal clutch unit in the power transmission device according to the embodiment of the present invention.

[0035] Fig.15 It is three-view drawing which shows the pressure contact member which comprises the centrifugal clutch unit in the power transmission device which concerns on embodiment of this invention.

[0036] Fig.16 These are four views showing a weight member constituting a centrifugal clutch unit in a power transmission device according to an embodiment of the present invention.

[0037] Fig.17 yes Fig.16 Sectional view along line XVII-XVII in FIG.

[0038] Fig.18 It is a plan view showing a state in which the weight member in the centrifugal clutch unit in the power transmission device according to the embodiment of the present invention is located at the inner diameter side position.

[0039] Fig.19It is a plan view showing a state in which the weight member in the centrifugal clutch unit in the power transmission device according to the embodiment of the present invention is located at the outer diameter side position.

[0040] Fig. 20 Schematic diagrams for explaining (a) the action of the pressure-contact assisting cam and (b) the action of the counter-torque limiter cam in the power transmission device according to the embodiment of the present invention.

[0041] Fig.21 It is a schematic diagram showing a vehicle to which the power transmission device according to the embodiment of the present invention is applied.

[0042] Fig. 22 It is a cross-sectional view showing a state in which the weight member in the power transmission device according to the embodiment of the present invention is located at the inner diameter side position.

[0043] Fig.23 This is a cross-sectional view showing a state in which the weight member in the power transmission device according to the embodiment of the present invention is located at an intermediate position between the inner diameter side position and the outer diameter side position.

[0044] Fig.24 This is a cross-sectional view showing a state in which the weight member in the power transmission device according to the embodiment of the present invention is located at the outer diameter side position.

[0045] Fig.25 This is a cross-sectional view showing a state in which the weight member is at the outer diameter side position and the pressure member is at the non-operating position in the power transmission device according to the embodiment of the present invention. DETAILED DESCRIPTION

[0046] Below, while referring to the attached Figure 1 Embodiments of the present invention will be described in detail.

[0047] The power transmission device K of this embodiment is as follows Fig.21 As shown in FIG. 1 , the transmission M is provided in the vehicle and is used to arbitrarily transmit the driving force of the engine E to the driving wheel T side via the transmission M or to cut off the transmission. Figures 1 to 17 As shown, it is composed of a clutch housing 2 having an input gear 1 (input member) that rotates by the driving force of the engine E of the vehicle, an output shaft 3 (output member) connected to the transmission M, clutch members (a first clutch member 4a and a second clutch member 4b), a pressure member 5, a plurality of driving side clutch plates 6 and a plurality of driven side clutch plates 7, a centrifugal clutch unit 9 with a weight member 10, and an auxiliary clutch plate 17.

[0048] The input gear 1 can rotate around the output shaft 3 when receiving the driving force (rotational force) transmitted from the engine E, and is connected to the clutch housing 2 by rivets or the like. Figure 2 ,3 The central right end side is formed as a cylindrical member opened and is connected to the input gear 1 . The central right end side is formed so as to be rotatable together with the rotation of the input gear 1 by the driving force of the engine E.

[0049] In addition, if Figure 4 As shown, the clutch housing 2 is formed with a plurality of cutouts 2a in the circumferential direction, and a plurality of drive-side clutch plates 6 are mounted in such a manner as to fit into these cutouts 2a. Each of the drive-side clutch plates 6 is formed of a plate material formed in a substantially annular shape and rotates with the rotation of the clutch housing 2, and is configured to be able to move in the axial direction ( Figure 2 , 3 Swipe up in the middle or left or right direction.

[0050] The clutch member (the first clutch member 4a and the second clutch member 4b) is equipped with a plurality of driven side clutch plates 7 alternately formed with the driving side clutch plates 6 of the clutch housing 2, and is connected to the output shaft 3 (output member) capable of rotating the drive wheels T via the vehicle's transmission M, and is composed of two components, the first clutch member 4a and the second clutch member 4b.

[0051] The first clutch member 4a is configured such that a through hole (see Figure 5 , 6 ) are inserted through the output shaft 3 and the gears formed by each other are meshed and connected in the rotation direction. Figure 5 , 6 As shown, the first clutch member 4a is formed with a slope surface 4aa constituting a pressure-assisted cam and a slope surface 4ab constituting a counter-torque limiter cam. It should be noted that reference numeral 4ac in the figure represents a protrusion having a through hole for a bolt B for connecting the first clutch member 4a and the fixing member 8.

[0052] like Figure 7 , 8 As shown in FIG. 1 , the second clutch member 4b is formed of an annular member having a flange portion 4bb, and is configured to mount the passive clutch plate 7 on a spline fitting portion 4ba formed on the outer peripheral surface by spline fitting. Figure 2 , 3 As shown, a pressure member 5 is assembled to the clutch members (the first clutch member 4a and the second clutch member 4b), and a plurality of driving side clutch plates 6 and driven side clutch plates 7 are alternately installed in a stacked state between the flange portion 5c of the pressure member 5 and the flange portion 4bb of the second clutch member 4b.

[0053] like Fig. 9 , 10As shown, the pressure member 5 is composed of a circular plate-shaped member with a flange portion 5c formed throughout the peripheral portion, and can move between a working position and a non-working position. The working position is a position in which the driving side clutch plate 6 and the passive side clutch plate 7 are pressed together to be in a state in which the driving force of the engine E can be transmitted to the wheels, and the non-working position is a position in which the pressing force between the driving side clutch plate 6 and the passive side clutch plate 7 is released to cut off the transmission of the driving force of the engine E to the wheels.

[0054] More specifically, if Figure 7 , 8 As shown, the spline fitting portion 4ba formed on the second clutch component 4b is composed of a concave-convex shape formed integrally over substantially the entire circumference of the outer peripheral side surface of the second clutch component 4b, and is constructed as follows: the driven side clutch plate 7 is fitted into the groove constituting the spline fitting portion 4ba, while allowing the driven side clutch plate 7 to move axially relative to the second clutch component 4b while restricting movement in the rotational direction, and can rotate together with the second clutch component 4b.

[0055] The driven side clutch plate 7 and the driving side clutch plate 6 are alternately stacked, and the adjacent clutch plates 6, 7 can be pressed or the pressing force can be released. That is, the two clutch plates 6, 7 are allowed to slide in the axial direction of the second clutch member 4b, and the clutch is opened by pressing the clutch plates (6a, 6b, 7a, 7b), so that the rotational force of the clutch housing 2 is transmitted to the output shaft 3 via the second clutch member 4b and the first clutch member 4a, and the clutch is closed by releasing the pressing force of the clutch plates (6a, 6b, 7a, 7b), so that the first clutch member 4a and the second clutch member 4b no longer follow the rotation of the clutch housing 2, and the transmission of the rotational force to the output shaft 3 is no longer performed.

[0056] Therefore, when the driving side clutch plate 6 and the driven side clutch plate 7 are pressed together, the rotational force (driving force of the engine E) input to the clutch housing 2 is transmitted to the driving wheel side (transmission M) via the output shaft 3 (output component), and when the pressure contact between the driving side clutch plate 6 and the driven side clutch plate 7 is released, the transmission of the rotational force (driving force of the engine E) input to the clutch housing 2 to the output shaft 3 (output component) can be cut off.

[0057] In addition, if Fig. 9 , 10 As shown in FIG. 2 , the pressure member 5 is formed with a plurality of (three in this embodiment) insertion holes 5d in the circumferential direction, and the clutch spring S is inserted into each insertion hole 5d. Figure 2As shown, the clutch spring S is accommodated in the insertion hole 5d and one end of the clutch spring S abuts against the fixing member 8, and is urged in the direction of pressing the driving side clutch plate 6 and the driven side clutch plate 7. In addition, by operating the clutch operating unit (not shown), the driving side clutch plate 6 and the driven side clutch plate 7 can be pressed or released.

[0058] Furthermore, in this embodiment, if Figure 5 , 6 As shown in FIGS. 9 and 10, the first clutch member 4a is formed with slope surfaces 4aa and 4ab, and the pressure member 5 is formed with slope surfaces 5a and 5b opposite to the slope surfaces 4aa and 4ab. That is, the slope surface 4aa abuts against the slope surface 5a to form a pressure-assisted cam, and the slope surface 4ab abuts against the slope surface 5b to form a counter-torque limiter cam.

[0059] When the rotation speed of the engine E increases and the rotational force input to the input gear 1 and the clutch housing 2 can be transmitted to the output shaft 3 via the first clutch member 4a and the second clutch member 4b (the weight member 10 is at the outer diameter side position), Fig. 20 As shown in (a), a rotational force in the direction a is applied to the pressure member 5, and therefore, a force in the direction c in the figure is generated in the pressure member 5 by the action of the pressure-contact assisting cam. As a result, the pressure member 5 moves in a direction in which the flange portion 5c is closer to the flange portion 4bb of the second clutch member 4b ( Figure 2 , 3 The left side of the middle part moves to increase the pressing force between the driving side clutch plate 6 and the driven side clutch plate 7.

[0060] On the other hand, when the rotation of the output shaft 3 exceeds the rotation speed of the input gear 1 and the clutch housing 2 and a reverse torque is generated, as shown in FIG. Fig. 20 As shown in (b), a rotational force in the direction b is applied to the clutch member 4, so that the pressure member 5 is moved in the direction d in the figure by the action of the counter-torque limiter cam, thereby releasing the pressing force between the driving side clutch plate 6 and the driven side clutch plate 7. In this way, it is possible to avoid adverse conditions with respect to the power transmission device K and the power source (engine E side) caused by the counter-torque.

[0061] like Figures 11 to 19 As shown, the centrifugal clutch unit 9 has a structure capable of being moved from an inner diameter side position (see Fig.18 ) to the outer diameter side (refer to Fig.19) is constructed as follows: when the weight member 10 is in the outer diameter side position, the driving side clutch plate 6 and the passive side clutch plate 7 are pressed together to set the driving force of the engine E to the wheel (driving wheel T) to be transmitted; and when the weight member 10 is in the inner diameter side position, the pressing force between the driving side clutch plate 6 and the passive side clutch plate 7 is released to cut off the transmission of the driving force of the engine E to the wheel (driving wheel T).

[0062] Specifically, the centrifugal clutch unit 9 is configured to include a weight member 10 composed of a shogi piece-shaped (block-shaped) member, a holding member 11 to which a support member 13 is mounted, a pressing member 12, a first spherical member 14, a second spherical member 15, and a biasing member 16 composed of a coil spring. It should be noted that the holding member 11 and the pressing member 12 are formed with a plurality of protrusions throughout the circumference, and are fitted into the notch 2a of the clutch housing 2, similarly to the drive-side clutch plate 6. Thus, the holding member 11 and the pressing member 12 can move in the axial direction of the clutch housing 2, respectively, and can be engaged in the rotational direction and rotate together with the clutch housing 2.

[0063] like Fig.16 As shown in the figure, the weight member 10 is composed of a shogi piece-shaped member having one surface X and another surface Y. Fig.17 As shown, the weight member 10 is configured to have a through hole 10a formed from one surface X to the other surface Y, an insertion portion 10b formed on the other surface Y, and a groove 10c formed on one surface X. Fig.18 , 19 As shown, the weight member 10 is received in the receiving portion 11a of the holding member 11 and is held at the inner diameter side position (see Fig.18 ), and, by being applied with centrifugal force, it moves outward against the force of the urging member 16 and reaches the outer diameter side position (refer to Fig.19 ).

[0064] The holding member 11 holds the weight member 10 so as to be movable between an inner diameter side position and an outer diameter side position. Fig.13 As shown, it is composed of an annular member, and is composed of a plurality of receiving portions 11a formed throughout the circumference and receiving the weight member 10, a groove shape 11b formed in the receiving portion 11a, and a pressing surface 11c. Each receiving portion 11a is composed of a concave shape matching the shape and movement range of the weight member 10, and is configured so that one end of the force application member 16 can abut against its inner peripheral wall surface 11aa.

[0065] In addition, a support member 13 is fixed to the surface of the holding member 11 where the receiving portion 11a is formed. Fig.14As shown, the support member 13 is formed with a retaining portion 13a formed in the radial direction, and the weight member 10 is retained on the retaining member 11 by matching the retaining portion 13a with the groove 10c of the weight member 10. That is, the weight member 10 is formed with a groove 10c in the direction from the inner diameter side position to the outer diameter side position at the central position of one surface X thereof, and the weight member 10 is retained so as to be movable in the radial direction (the direction from the inner diameter side position to the outer diameter side position) by matching the retaining portion 13a with the groove 10c.

[0066] The pressure contact member 12 is moved from the inner diameter side position to the outer diameter side position by the weight member 10 to the lamination direction ( Figure 2 , 3 The driving side clutch plate 6 and the driven side clutch plate 7 are pressed into contact with each other. Fig.15 As shown, the pressing member 12 is composed of an annular member and has a plurality of slope grooves 12a formed in the circumferential direction, groove shapes 12b formed at positions where the slope grooves 12a are formed, and a pressing surface 12c.

[0067] The gradient grooves 12a are formed at positions corresponding to the weight members 10, and are set to be upslope from the inside to the outside. Thus, when the clutch housing 2 is stopped, the weight member 10 is held at the inner diameter side position by the force of the force application member 16, and when the clutch housing 2 rotates, the centrifugal force is applied to the weight member 10 and the weight member 10 moves along the upslope gradient grooves 12a, so that the pressing member 12 moves in the direction away from the retaining member 11 (i.e., the direction in which the driving side clutch plate 6 and the driven side clutch plate 7 are pressed).

[0068] Therefore, if the holding member 11 and the pressing member 12 are assembled while the weight member 10 is placed in the middle, Fig.11 , 12 As shown, the slope groove 12a is located at a position corresponding to each weight member 10, and the weight member 10 moves from the inner diameter side position to the outer diameter side position and along the slope groove 12a by centrifugal force, and the pressing member 12 moves to the outer diameter side position. Fig.11 The pressing surface 12c formed on the pressing member 12 presses the driving side clutch plate 6 and the driven side clutch plate 7 to be in a pressing state, and the holding member 11 moves toward the driving side clutch plate 6 and the driven side clutch plate 7 by its reaction force. Fig.11 The auxiliary clutch plate 17 is moved in the direction opposite to the arrow (left side in the figure), and the pressing surface 11 c formed on the holding member 11 presses the auxiliary clutch plate 17 .

[0069] like Fig.18 , 19As shown, the weight member 10 of this embodiment is respectively received in a plurality of receiving portions 11a formed in the circumferential direction of the holding member 11 and can move in the radial direction, and the force applying member 16 is formed on the inner peripheral wall surface 11aa of the receiving portion 11a (refer to Fig.13 ) are arranged in a plurality of circumferential directions (two in each case in the present embodiment) between the weight member 10 to apply force to the weight member 10 from the outer diameter side position toward the inner diameter side position. Here, the inner peripheral wall surface 11aa of the housing portion 11a is set as a flat surface that abuts against one end of the force applying member 16, so that the force applying member 16 can be installed in a stable state.

[0070] In addition, the weight member 10 of the present embodiment is formed so that the surface ( Fig.17 The other surface Y in the middle is an opening of a tunnel-shaped insertion portion 10b through which the force-applying member 16 can be inserted and installed. Furthermore, the weight member 10 in a state in which the force-applying member 16 is inserted into the insertion portion 10b is accommodated in the receiving portion 11a of the retaining member 11, and the force-applying member 16 is installed in a manner of being located between the inner peripheral wall surface 11aa of the receiving portion 11a and the weight member 10. It should be noted that the force-applying member 16 is arranged in a manner in which one end abuts against the inner peripheral wall surface 11aa and the other end abuts against the end wall surface 10ba of the insertion portion 10b, and can apply force to the weight member 10 from the outer diameter side position toward the inner diameter side position.

[0071] The first spherical member 14 is composed of a steel ball mounted on the weight member 10. Fig.16 , 17 As shown, a portion of the spherical member 15 is protruded from an opening 10aa (a small diameter opening on the side of one surface X) formed in the through hole 10a of the weight member 10, and can roll in contact with the rolling surface of the pressing member 12. In addition, the second spherical member 15 is composed of a steel ball mounted on the weight member 10, as shown in FIG. Fig.16 , 17 As shown, a portion is protruded from the other opening 10ab (the large-diameter opening on the other surface Y side) formed in the through hole 10a of the weight member 10 so as to be able to roll in contact with the rolling surface of the holding member 11.

[0072] like Fig.17As shown, the through hole 10a of the present embodiment is formed into a tapered shape in a manner that the diameter continuously increases from the opening 10aa on one side (the opening of the small diameter on the side of one surface X) to the opening 10ab on the other side (the opening of the large diameter on the side of the other surface Y), and the first spherical member 14 is prevented from falling off by the outer peripheral edge of the opening of the small diameter (the opening 10aa on the side of one surface X in the present embodiment) in the opening 10aa on one side and the opening 10ab on the other side. That is, the first spherical member 14 and the second spherical member 15 of the present embodiment are composed of spherical members with different diameters (the second spherical member 15 is a member with a larger diameter than the first spherical member 14) according to the inner diameter of the through hole 10a, and the first spherical member 14 with a small diameter can roll in a state where the first spherical member 14 with a small diameter is prevented from falling off by the opening edge on the small diameter side of the through hole 10a and is in contact with the inner peripheral surface of the through hole 10a.

[0073] On the other hand, Fig.11 , 12 As shown, the second spherical member 15 is prevented from falling off by the rolling surface of the retaining member 11. Thus, the first spherical member 14 of small diameter is prevented from falling off by the opening edge of the small diameter side of the through hole 10a, and the second spherical member 15 of large diameter is prevented from falling off by the rolling surface of the retaining member 11 in a state where a portion thereof protrudes from the opening of the large diameter side of the through hole 10a. It should be noted that, in the present embodiment, the second spherical member 15 of large diameter is assembled in a manner facing the rolling surface of the retaining member 11, but the second spherical member 15 may also be assembled in a manner facing the rolling surface of the crimping member 12. In this case, the first spherical member 14 of small diameter is prevented from falling off by the opening edge of the small diameter side of the through hole 10a, and the second spherical member 15 of large diameter is prevented from falling off by the rolling surface of the crimping member 12 in a state where a portion thereof protrudes from the opening of the large diameter side of the through hole 10a.

[0074] like Fig.13 As shown, the rolling surface of the holding member 11 (in this embodiment, the rolling surface of the second spherical member 15) is composed of a groove shape 11b along the moving direction of the weight member 10 (the direction connecting the inner diameter side position and the outer diameter side position), and as shown in FIG. Fig.15 As shown, the rolling surface of the pressing member 12 (the rolling surface of the first spherical member 14 in this embodiment) is composed of a groove shape 12b along the moving direction of the weight member 10 (the direction connecting the inner diameter side position and the outer diameter side position).

[0075] Moreover, if Fig.16 , 18As shown in Figures 19, the first spherical member 14 and the second spherical member 15 of the present embodiment are respectively formed in plurality (in the present embodiment, two first spherical members 14 and two second spherical members 15 are respectively formed) throughout the circumference of the retaining member 11 (the width direction of the weight member 10). As the weight member 10 moves, the first spherical member 14 and the second spherical member 15 are respectively able to roll in the through hole 10a while moving along the groove shapes 11b and 12b.

[0076] The auxiliary clutch plate 17 is composed of an annular member having a diameter different from that of the driving side clutch plate 6 and the driven side clutch plate 7 (in this embodiment, a smaller diameter than the driving side clutch plate 6 and the driven side clutch plate 7). Figure 2 , 3 As shown, the output shaft 3 (output member) is inserted into the central opening 17 a and is put into a fitted state, and the structure includes a pressed surface 17 b facing the pressing surface 11 c of the holding member 11 .

[0077] When the auxiliary clutch plate 17 is pressed and pressed by the pressing surface 11c formed on the holding member 11 when the weight member 10 is in the outer diameter side position (that is, when the driving side clutch plate 6 and the driven side clutch plate 7 are in a pressed state), the driving force of the engine E can be transmitted to the output shaft 3. In addition, when the weight member 10 is in the inner diameter side position (that is, when the pressing force of the driving side clutch plate 6 and the driven side clutch plate 7 is in a released state), the pressing force formed on the pressing surface 11c of the holding member 11 decreases and the pressing force is released, so that the transmission of the driving force of the engine E to the output shaft 3 can be cut off.

[0078] That is, if the weight member 10 moves to the outer diameter side position, the gradient groove 12a functions as a cam, and the holding member 11 and the pressing member 12 move in the direction of moving away from each other. As a result, the pressing surface 12c of the pressing member 12 presses the driving side clutch plate 6 and the driven side clutch plate 7, and the pressing surface 11c of the holding member 11 presses and presses the pressed surface 17b of the auxiliary clutch plate 17, so that the driving force of the engine E is transmitted to the driving wheel T.

[0079] Moreover, if Figure 5 , 6 As shown in FIG. 1 , the first clutch member 4a of the present embodiment has a contact surface 4ad formed on a portion of the surface facing the pressure member 5, and as shown in FIG. Fig. 9 , 10 As shown, the pressure member 5 has a contact surface 5e formed on a portion of the surface facing the first clutch member 4a. When the first clutch member 4a, the second clutch member 4b and the pressure member 5 are assembled (in a state where no torque is transmitted from the input gear 1 (input member) to the output shaft 3 (output member)), as shown in FIG. Figure 2 ,3 As shown in FIG. 1 , the contact surface 4ad and the contact surface 5e are in contact with each other.

[0080] In this way, when the abutment surface 4ad and the abutment surface 5e are in contact with each other, the weight member 10 of the centrifugal clutch unit 9 is moved from the inner diameter side position (see Fig. 22 ) to the middle position (refer to Fig.23 ) moves and the transmission torque from the input gear 1 (input member) to the output shaft 3 (output member) increases, the relative movement between the first clutch member 4a and the pressure member 5 is not allowed, so the operation of the pressure assisting cam is restricted.

[0081] Afterwards, if the weight member 10 of the centrifugal clutch unit 9 is moved from the middle position (refer to Fig.23 ) toward the outer diameter side (refer to Fig.24 ) is further moved, the flange portion 4bb of the second clutch member 4b is pressed to press the driving side clutch plate 6 and the driven side clutch plate 7, and the pressing force of the flange portion 4bb becomes greater than the force of the clutch spring S, so that the second clutch member 4b and the pressure member 5 are axially ( Figure 2 , 3 The first clutch member 4a moves in the right direction, so that the contact surface 4ad of the first clutch member 4a and the contact surface 5e of the pressure member 5 are separated. Fig.25 A state in which the weight member 10 is in the outer diameter side position and the pressure member 5 is in the non-operating position (clutch-off state) is shown.

[0082] In this way, when the abutment surface 4ad and the abutment surface 5e are separated, in the process of the counterweight member 10 of the centrifugal clutch unit 9 moving from the inner diameter side position to the outer diameter side position and increasing the transmission torque from the input gear 1 (input member) to the output shaft 3 (output member), the relative movement between the first clutch member 4a and the pressure member 5 is allowed, and thus the operation of the crimping auxiliary cam is allowed.

[0083] According to the power transmission device K of this embodiment, the through hole 10a of the counterweight member 10 in the centrifugal clutch unit 9 is formed into a cone from the opening 10aa on one side to the opening 10ab on the other side, and the first spherical member 14 is prevented from falling off by the outer peripheral edge portion of the small-diameter opening in the opening 10aa on one side and the opening 10ab on the other side, so that the first spherical member 14 can be easily and correctly installed on the counterweight member 10, which can reduce the manufacturing cost.

[0084] In addition, the first spherical member 14 and the second spherical member 15 are composed of spherical members of different diameters corresponding to the inner diameter of the through hole 10a, and can roll in a state of contact with the inner peripheral surface of the through hole 10a, so that the first spherical member 14 and the second spherical member 15 can roll stably when the weight member 10 moves, and smooth movement can be sought. Moreover, the second spherical member 15 of the present embodiment is prevented from falling off by the rolling surface of the holding member 11 or the pressing member 12, so the first spherical member 14 and the second spherical member 15 can be easily prevented from falling off.

[0085] Moreover, the rolling surface of the retaining member 11 or the crimping member 12 is composed of a groove shape (11b, 12b) along the moving direction of the counterweight member 10, so that the second spherical member 15 on the large-diameter opening side and the first spherical member 14 on the small-diameter opening side can be reliably prevented from falling off and the counterweight member 10 can be moved more smoothly.

[0086] In addition, the weight components 10 of the present embodiment are respectively accommodated in a plurality of accommodation portions 11a formed throughout the circumference of the retaining member 11 and are capable of moving in a radial direction, and a plurality of force-applying members 16 are circumferentially arranged between the inner circumferential wall surface 11aa of the accommodation portion 11a and the weight component 10 to apply force to the weight component 10 from the outer diameter side position toward the inner diameter side position, thereby being able to apply force to the weight component 10 from the outer diameter side position toward the inner diameter side position with high precision, and being able to stably move the weight component 10 according to the centrifugal force.

[0087] In addition, the weight member 10 of the present embodiment is formed with an insertion portion 10b that opens the surface facing the holding member 11 and allows the urging member 16 to be inserted and installed, so that the urging member 16 can be easily assembled with respect to the weight member 10. Moreover, the weight member 10 of the present embodiment is formed with a groove 10c in the direction from the inner diameter side position to the outer diameter side position, and the holding member 11 (specifically, the support member 13 fixed to the holding member 11 and integrated therewith) is formed with a holding portion 13a that matches the groove 10c and holds the weight member 10, so that the movement of the weight member 10 can be stably performed.

[0088] Moreover, the centrifugal clutch unit 9 of the present embodiment is constructed to include: a first spherical member 14, a portion of which protrudes from an opening 10aa on one side of the through hole 10a formed in the counterweight member 10, and can roll in contact with the rolling surface (groove shape 12b) of the pressing member 12; and a second spherical member 15, a portion of which protrudes from an opening 10ab on the other side of the through hole 10a formed in the counterweight member 10, and can roll in contact with the rolling surface (groove shape 11b) of the retaining member 11, so that the movement of the counterweight member 10 can be performed more stably.

[0089] In particular, the holding member 11 or the pressing member 12 has a groove shape (11b, 12b) along the moving direction of the weight member 10, and the groove shape (11b, 12b) is set as a rolling surface of the first spherical member 14 or the second spherical member 15, so that the weight member 10 can be moved more smoothly. In addition, the first spherical member 14 and the second spherical member 15 of the present embodiment are respectively formed in plurality in the circumferential direction of the holding member 11 (the width direction of the weight member 10), so that the movement of the weight member 10 can be further stabilized.

[0090] The present embodiment has been described above, but the present invention is not limited thereto, and for example, a structure without the cam for crimping auxiliary (the slope surface 4aa and the slope surface 5a) and the cam for the counter torque limiter (the slope surface 4ab and the slope surface 5b) and a structure without the auxiliary clutch plate 17 may be used. In addition, in the present embodiment, the second spherical member 15 is prevented from falling off by the rolling surface (groove shape 11a) of the retaining member 11 (or the crimping member 12), but it may also be prevented from falling off by other means and methods such as riveting.

[0091] Moreover, in the present embodiment, the contact surface 4ad and the contact surface 5e are in contact with each other when the first clutch member 4a, the second clutch member 4b and the pressure member 5 are assembled (in a state where no torque is transmitted from the input gear 1 (input member) to the output shaft 3 (output member)), but the contact surface 4ad and the contact surface 5e may be separated from each other without the contact surface 4ad and the contact surface 5e. It should be noted that the power transmission device of the present invention can be applied to various multi-plate clutch type power transmission devices such as automobiles, three-wheeled or four-wheeled off-road vehicles, or general-purpose machines in addition to two-wheeled vehicles.

[0092] Industrial Applicability

[0093] As long as the centrifugal clutch unit is "structured to include: a retaining member, which retains the counterweight member so as to be movable between an inner diameter side position and an outer diameter side position; a crimping member, which moves the counterweight member from the inner diameter side position to the outer diameter side position and moves in the stacking direction of the driving side clutch plate and the passive side clutch plate so as to crimp the driving side clutch plate and the passive side clutch plate; a first spherical member, a portion of which protrudes from an opening on one side of a through hole formed in the counterweight member and can roll in contact with the rolling surface of the crimping member; and a second spherical member, a portion of which protrudes from an opening on the other side of the through hole formed in the counterweight member and can roll in contact with the rolling surface of the retaining member, the through hole being formed in a tapered shape from the opening on one side to the opening on the other side, and the first spherical member being prevented from falling off by the outer peripheral edge portion of the small diameter opening in the opening on the one side and the opening on the other side", it can also be applied to power transmission devices with different appearance shapes or power transmission devices with additional functions.

[0094] Description of Reference Numerals

[0095] 1 Input gear (input component)

[0096] 2 Clutch housing

[0097] 2a Incisions

[0098] 3 Output shaft (output component)

[0099] 4a First clutch member

[0100] 4aa Slope surface (Cam for crimping assistance)

[0101] 4ab Slope surface (Cam for anti-torque limiter)

[0102] 4ac raised part

[0103] 4ad abutment surface

[0104] 4b Second clutch member

[0105] 4ba spline fitting part

[0106] 4bb flange

[0107] 5 Pressure components

[0108] 5a Slope surface (cam for crimping assistance)

[0109] 5b Slope surface (Cam for anti-torque limiter)

[0110] 5c Flange

[0111] 5d Embedded Hole

[0112] 5e Abutment surface

[0113] 6 Drive side clutch plate

[0114] 7 Passive side clutch plate

[0115] 8 Fixed components

[0116] 9 Centrifugal clutch unit

[0117] 10 Counterweight component

[0118] 10a Through hole

[0119] 10aa Opening of one side

[0120] 10ab The other side's opening

[0121] 10b Insertion section

[0122] 10ba end wall

[0123] 10c slot

[0124] 11. Retaining member

[0125] 11a Containment Department

[0126] 11aa inner peripheral wall

[0127] 11b Slot shape

[0128] 11c Pressing surface

[0129] 12 Crimping components

[0130] 12a Slope trough

[0131] 12b Slot shape

[0132] 12c Pressing surface

[0133] 13 Supporting member

[0134] 13a Holding part

[0135] 14 first spherical member

[0136] 15. Second spherical member

[0137] 16 Force-applying member

[0138] 17 Auxiliary clutch plate

[0139] 17a Central opening

[0140] 17b Pressed surface

[0141] S Clutch spring.

Claims

1. A power transmission device comprising: A clutch member is housed in a clutch housing that rotates together with an input member that rotates by a driving force of an engine of a vehicle and on which a plurality of driving-side clutch plates are mounted, a plurality of driven-side clutch plates that are formed alternately with the driving-side clutch plates are mounted, and is connected to an output member that can rotate wheels of the vehicle; a pressure member capable of moving between an operating position and a non-operating position, wherein the operating position is a position in which the driving side clutch plate and the driven side clutch plate are pressed together to be in a state in which the driving force of the engine can be transmitted to the wheel, and the non-operating position is a position in which the pressing force between the driving side clutch plate and the driven side clutch plate is released to cut off the transmission of the driving force of the engine to the wheel; and The centrifugal clutch unit comprises a weight member that can be moved from an inner diameter side position to an outer diameter side position by centrifugal force accompanying the rotation of the clutch housing, and when the weight member is at the outer diameter side position, the driving side clutch plate and the driven side clutch plate are pressed into contact to be in a state capable of transmitting the driving force of the engine to the wheel, and when the weight member is at the inner diameter side position, the pressing force between the driving side clutch plate and the driven side clutch plate is released to cut off the transmission of the driving force of the engine to the wheel. The power transmission device is characterized in that: The centrifugal clutch unit is configured to include: a holding member that holds the weight member so as to be movable between the inner diameter side position and the outer diameter side position; a pressing member that moves in a stacking direction of the driving side clutch plate and the driven side clutch plate by the weight member moving from the inner diameter side position to the outer diameter side position so as to press the driving side clutch plate and the driven side clutch plate into contact with each other; A first spherical member, a portion of which protrudes from one opening of the through hole formed in the weight member so as to be able to roll in contact with the rolling surface of the pressing member; and The second spherical member is configured such that a portion thereof protrudes from the other opening of the through hole formed in the weight member so as to be able to roll in contact with the rolling surface of the holding member. The through hole is formed in a tapered shape from the one opening to the other opening, and the first spherical member is prevented from coming off by an outer peripheral edge portion of the opening with a smaller diameter among the one opening and the other opening.

2. The power transmission device according to claim 1, characterized in that: The first spherical member and the second spherical member are spherical members having different diameters from each other, and are capable of rolling in contact with the inner peripheral surface of the through hole.

3. The power transmission device according to claim 2, characterized in that: The first spherical member has a smaller diameter than the second spherical member.

4. The power transmission device according to any one of claims 1 to 3, characterized in that: The second spherical member is prevented from coming off by the rolling surface of the holding member or the rolling surface of the pressing member.

5. The power transmission device according to claim 4, characterized in that: The rolling surface of the holding member and / or the rolling surface of the pressing member is formed in a groove shape along the moving direction of the weight member.

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