Power transmission device

Abstract

Provided is a power transmission device capable of applying a high-precision force to a weight member from an outer diameter side toward an inner diameter side and stably moving the weight member according to a centrifugal force. A centrifugal clutch unit (9) is configured to include a holding member (11), a press contact member (12), and a force applying member (16) that applies a force to a weight member (10) from an outer diameter side toward an inner diameter side. The weight member (10) is housed in a plurality of housing portions (11a) formed in the holding member (11) in a circumferential direction so as to be capable of moving in a radial direction. The force applying member (16) is provided in the circumferential direction between an inner peripheral wall surface (11aa) of the housing portion (11a) and the weight member (10) so as to apply a force to the weight member (10) from the outer diameter side toward the inner diameter side.

Description

TECHNICAL FIELD

[0001] The present application relates to a power transmission device capable of arbitrarily transmitting or cutting off transmission of a rotational force of an input member to an output member. BACKGROUND

[0002] Generally, a power transmission device provided in a two-wheeled motor vehicle for arbitrarily transmitting or cutting off transmission of a driving force of an engine to a transmission and drive wheels has an input member linked to the engine side, an output member linked to the transmission and drive wheels side, a clutch member linked to the output member, and a pressure member capable of approaching or departing from the clutch member, and is configured to transmit the power by pressing a driving-side clutch plate and a driven-side clutch plate to approach the pressure member to the clutch member, and cut off the transmission of the power by releasing the pressing force of the driving-side clutch plate and the driven-side clutch plate to depart the pressure member from the clutch member.

[0003] As a conventional power transmission device, for example, as disclosed in Patent Literature 1, a centrifugal clutch unit provided with a counterweight member that is moved from an inner diameter side position to an outer diameter side position of a groove portion by centrifugal force accompanying rotation of a clutch housing, thereby being capable of pressing a driving-side clutch plate and a driven-side clutch plate has been proposed. According to the conventional power transmission device, the counterweight member is pressed by centrifugal force to press the driving-side clutch plate and the driven-side clutch plate to transmit the driving force of the engine to the wheels by rotating the clutch housing accompanying driving of the engine.

[0004] PRIOR ART DOCUMENTS

[0005] PATENT LITERATURE

[0006] Patent Literature 1: International Publication No. 2013 / 183588 SUMMARY

[0007] PROBLEMS TO BE SOLVED BY THE INVENTION

[0008] However, the above-described conventional power transmission device requires a relatively large movement space of the counterweight member constituted by a steel ball, and the device can be large-sized. Thus, the present applicant has intensively studied to downsize the device by using a counterweight member having a shogi piece shape (block shape) having a front surface and a back surface, but in this case, in order to return the counterweight member to the initial position, a structure provided with a spring or the like biasing member has been studied.

[0009] According to this structure, when centrifugal force accompanying rotation of the clutch housing decreases, the weight member can be smoothly moved from the outer diameter side position to the inner diameter side position by the urging member. However, in a case where a plurality of weight members are provided so as to be arranged in the circumferential direction of the holding member and are respectively movable in the radial direction, there is a problem that it is difficult to precisely urge the weight members from the outer diameter side position toward the inner diameter side position by the urging unit.

[0010] The present application has been made in view of such circumstances, and provides a power transmission device capable of precisely urging a weight member from an outer diameter side position toward an inner diameter side position and stably moving the weight member according to centrifugal force.

[0011] Means for solving the problem

[0012] The application described in Solution 1 is a power transmission device having: a clutch housing that rotates together with an input member that rotates by a driving force of an engine of a vehicle, and a plurality of driving side clutch plates installed; a clutch member that has a plurality of passive side clutch plates alternately formed with the driving side clutch plates of the clutch housing, and is linked to an output member that can rotate a wheel of the vehicle; a pressure member that can move between an operating position and a non-operating position, the operating position being a position where the driving side clutch plates and the passive side clutch plates are pressed to be in a state where the driving force of the engine can be transmitted to the wheel, and the non-operating position being a position where the pressing force of the driving side clutch plates and the passive side clutch plates is released to be able to cut off the transmission of the driving force of the engine to the wheel; and a centrifugal clutch unit having a weight member that can move from an inner diameter side position to an outer diameter side position by centrifugal force accompanying rotation of the clutch housing, the driving side clutch plates and the passive side clutch plates being pressed to be in a state where the driving force of the engine can be transmitted to the wheel when the weight member is in the outer diameter side position, and the pressing force of the driving side clutch plates and the passive side clutch plates being released to be able to cut off the transmission of the driving force of the engine to the wheel when the weight member is in the inner diameter side position, the power transmission device being characterized in that the centrifugal clutch unit is configured to have: 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 plates and the passive side clutch plates by the weight member moving from the inner diameter side position to the outer diameter side position to press the driving side clutch plates and the passive side clutch plates; and an urging member that urges the weight member from the outer diameter side position toward the inner diameter side position, the weight member being respectively accommodated in accommodation portions formed in a plurality in the circumferential direction of the holding member so as to be movable in the radial direction, and the urging member being respectively provided in a plurality in the circumferential direction between an inner peripheral wall surface of the accommodation portion and the weight member.

[0013] The invention described in Solution 2 is the power transmission device described in Solution 1, characterized in that the weight member is formed with an insertion portion that opens a surface opposite the holding member and enables the insertion and attachment of the force applying member.

[0014] The invention described in Solution 3 is the power transmission device described in Solution 1 or 2, characterized in that the weight member is formed with a groove in a direction from the inner diameter side position to the outer diameter side position, and the holding member is formed with a holding portion that matches the groove and holds the weight member.

[0015] The invention described in Solution 4 is the power transmission device described in any one of Solutions 1 to 3, characterized in that the centrifugal clutch unit is configured to have: a first spherical member that protrudes a portion from an opening of one of the through holes formed in the weight member and is able to roll in contact with a rolling surface of the pressure contact member; and a second spherical member that protrudes a portion from an opening of the other of the through holes formed in the weight member and is able to roll in contact with a rolling surface of the holding member.

[0016] The invention described in Solution 5 is the power transmission device described in Solution 4, characterized in that the holding member or the pressure contact member has a groove shape along a moving direction of the weight member, which is set as the rolling surface of the first spherical member or the second spherical member.

[0017] The invention described in Solution 6 is the power transmission device described in Solution 4 or 5, characterized in that the first spherical member and the second spherical member are each formed with a plurality of members across a circumferential direction of the holding member.

[0018] Effects of the Invention

[0019] According to the invention of Solution 1, since the weight members are respectively accommodated in the accommodation portions formed with a plurality of members across a circumferential direction of the holding member and are able to move in a radial direction, and the force applying member is respectively provided with a plurality of members in a circumferential direction between an inner peripheral wall surface of the accommodation portion and the weight member, the weight members can be highly precisely forced from the outer diameter side position toward the inner diameter side position, and the weight members can be stably moved according to a centrifugal force.

[0020] According to the invention of Solution 2, since the weight member is formed with an insertion portion that opens a surface opposite the holding member and enables the insertion and attachment of the force applying member, the assembly of the force applying member with respect to the weight member can be easily performed.

[0021] According to the invention of Solution 3, since the weight member is formed with a groove in a direction from the inner diameter side position to the outer diameter side position, and the holding member is formed with a holding portion that matches the groove and holds the weight member, the movement of the weight member can be stably performed.

[0022] According to the application of the aspect 4, since the centrifugal clutch unit is configured to have: a first ball-shaped member that protrudes a part from an opening of one side of the through-hole formed in the weight member to be able to contact and roll on a rolling surface of the pressure member; and a second ball-shaped member that protrudes a part from an opening of the other side of the through-hole formed in the weight member to be able to contact and roll on a rolling surface of the holding member, movement of the weight member can be performed more stably.

[0023] According to the application of the aspect 5, since the holding member or the pressure member has a groove shape along a moving direction of the weight member, the groove shape is provided as the rolling surface of the first ball-shaped member or the second ball-shaped member, movement of the weight member can be performed more smoothly.

[0024] According to the application of the aspect 6, since the first ball-shaped member and the second ball-shaped member are each formed with a plurality of members across a circumferential direction of the holding member, movement of the weight member can be performed more stably. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 is an appearance view of a power transmission device according to an embodiment of the application.

[0026] Figure 2 is a cross-sectional view taken along line II-II in Figure 1

[0027] Figure 3 is a cross-sectional view taken along line III-III in Figure 1

[0028] Figure 4 is a perspective view of a clutch housing in a power transmission device according to an embodiment of the application.

[0029] Figure 5 is a three-view of a first clutch member in a power transmission device according to an embodiment of the application.

[0030] Figure 6 is a perspective view of a first clutch member in a power transmission device according to an embodiment of the application.

[0031] Figure 7 is a three-view of a second clutch member in a power transmission device according to an embodiment of the application.

[0032] Figure 8 is a perspective view of a second clutch member in a power transmission device according to an embodiment of the application.

[0033] Figure 9 is a three-view of a pressure member in a power transmission device according to an embodiment of the application.​​

[0034] Figure 10 is a perspective view showing a pressure member in a power transmission apparatus of an embodiment of the present application.

[0035] Figure 11 is a longitudinal sectional view showing a centrifugal clutch unit in a power transmission apparatus of an embodiment of the present application.

[0036] Figure 12 is a perspective view showing a centrifugal clutch unit in a power transmission apparatus of an embodiment of the present application, partially cut away.

[0037] Figure 13 is a three-view drawing showing a retaining member of a centrifugal clutch unit in a power transmission apparatus constituting an embodiment of the present application.

[0038] Figure 14 is a three-view drawing showing a support member of a centrifugal clutch unit in a power transmission apparatus constituting an embodiment of the present application.

[0039] Figure 15 is a three-view drawing showing a pressure contact member of a centrifugal clutch unit in a power transmission apparatus constituting an embodiment of the present application.

[0040] Figure 16 is a four-view drawing showing a counterweight member of a centrifugal clutch unit in a power transmission apparatus constituting an embodiment of the present application.

[0041] Figure 17 is Figure 16 is a sectional view taken along lines XVII-XVII in FIG. 17.

[0042] Figure 18 is a plan view showing a state in which the counterweight member in a centrifugal clutch unit in a power transmission apparatus of an embodiment of the present application is in an inner diameter side position.

[0043] Figure 19 is a plan view showing a state in which the counterweight member in a centrifugal clutch unit in a power transmission apparatus of an embodiment of the present application is in an outer diameter side position.

[0044] Figure 20 is a schematic view for explaining (a) an action of a pressure contact assisting cam and (b) an action of a reverse torque limiter cam in a power transmission apparatus of an embodiment of the present application.

[0045] Figure 21 is a schematic view showing a vehicle to which a power transmission apparatus of an embodiment of the present application is applied.

[0046] Figure 22This is a cross-sectional view showing the counterweight member in the power transmission device according to an embodiment of the present invention in the position of the inner diameter side.

[0047] Figure 23 This is a cross-sectional view showing the counterweight member in the power transmission device according to an embodiment of the present invention in an intermediate position between the inner diameter side position and the outer diameter side position.

[0048] Figure 24 This is a cross-sectional view showing the counterweight member in the power transmission device according to an embodiment of the present invention in the position of the outer diameter side.

[0049] Figure 25 This is a cross-sectional view showing the counterweight member in the power transmission device according to an embodiment of the present invention in the outer diameter side position and the pressure member in the non-working position. Detailed Implementation

[0050] The following is a reference to the appendix. Figure 1 The embodiments of the present invention will be described in detail below.

[0051] The power transmission device K in this embodiment is as follows: Figure 21 As shown, it is configured in the vehicle to arbitrarily transmit or disconnect the driving force of the engine E via the transmission M to the drive wheel T side, such as... Figures 1 to 17 As shown, the system comprises a clutch housing 2 having an input gear 1 (input member) that rotates under the driving force of the engine E of the vehicle, an output shaft 3 (output member) connected to the transmission M, clutch members (first clutch member 4a and second clutch member 4b), a pressure member 5, multiple drive-side clutch plates 6 and multiple passive-side clutch plates 7, a centrifugal clutch unit 9 having a counterweight member 10, and an auxiliary clutch plate 17.

[0052] If the input gear 1 is fed with driving force (rotational force) transmitted from the engine E, it can rotate around the output shaft 3 and is connected to the clutch housing 2 via rivets, etc. The clutch housing 2 is composed of... Figure 2 , 3 The cylindrical member with an opening at the right end is configured to be connected to the input gear 1 and can rotate together with the rotation of the input gear 1 by the driving force of the engine E.

[0053] In addition, such as Figure 4 As shown, the clutch housing 2 has multiple circumferential cuts 2a, into which multiple drive-side clutch plates 6 are mounted. Each drive-side clutch plate 6 is formed as a generally annular plate and rotates together with the clutch housing 2, and is configured to be axially ( Figure 2 , 3 Slide up in the left or right direction.

[0054] The clutch members (first clutch member 4a and second clutch member 4b) are installed with a plurality of driven-side clutch plates 7 formed alternately with the driving-side clutch plates 6 of the clutch housing 2, and are linked with an output shaft 3 (output member) capable of rotating the drive wheels T via a transmission M of the vehicle, and are constituted by assembling the two members of the first clutch member 4a and the second clutch member 4b.

[0055] The first clutch member 4a is constituted so as to pass the output shaft 3 through a through-hole (refer to FIG. 2) formed in the center thereof and to be linked in the rotational direction by gear engagement with each other. Figure 5 6 As shown in FIG. 2, the first clutch member 4a is constituted so as to pass the output shaft 3 through a through-hole 4a formed in the center thereof and to be linked in the rotational direction by gear engagement with each other. Figure 5 6 As shown in FIG. 2, the first clutch member 4a is constituted so as to pass the output shaft 3 through a through-hole 4a formed in the center thereof and to be linked in the rotational direction by gear engagement with each other.

[0056] As shown in FIG. 2, the first clutch member 4a is constituted so as to pass the output shaft 3 through a through-hole 4a formed in the center thereof and to be linked in the rotational direction by gear engagement with each other. Figure 7 8 As shown in FIG. 2, the first clutch member 4a is constituted so as to pass the output shaft 3 through a through-hole 4a formed in the center thereof and to be linked in the rotational direction by gear engagement with each other. Figure 2 3 As shown in FIG. 2, the first clutch member 4a is constituted so as to pass the output shaft 3 through a through-hole 4a formed in the center thereof and to be linked in the rotational direction by gear engagement with each other.

[0057] As shown in FIG. 2, the first clutch member 4a is constituted so as to pass the output shaft 3 through a through-hole 4a formed in the center thereof and to be linked in the rotational direction by gear engagement with each other. Figure 9 10 As shown in FIG. 2, the first clutch member 4a is constituted so as to pass the output shaft 3 through a through-hole 4a formed in the center thereof and to be linked in the rotational direction by gear engagement with each other.

[0058] As shown in FIG. 2, the first clutch member 4a is constituted so as to pass the output shaft 3 through a through-hole 4a formed in the center thereof and to be linked in the rotational direction by gear engagement with each other. Figure 7 8 ​​​​​​As shown, the spline fitting portion 4ba formed in the second clutch member 4b is composed of a concave-convex shape integrally formed throughout the outer peripheral side surface of the second clutch member 4b, and is configured to be fitted into the groove constituting the spline fitting portion 4ba by the passive-side clutch plate 7, to allow movement of the passive-side clutch plate 7 in the axial direction of the second clutch member 4b while restricting movement in the rotational direction, and to be able to rotate together with the second clutch member 4b.

[0059] The passive-side clutch plate 7 is formed in alternation with the driving-side clutch plate 6, and adjacent each clutch plate 6, 7 can achieve press-fitting or release of the press-fitting force. 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 press-fitting of each clutch plate (6a, 6b, 7a, 7b), so as to become a state in which 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 release of the press-fitting force of each clutch plate (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 transmission of the rotational force to the output shaft 3 no longer occurs.

[0060] Thus, in a state in which the driving-side clutch plate 6 and the passive-side clutch plate 7 are press-fitted, the rotational force (driving force of the engine E) input to the clutch housing 2 is transmitted to the drive wheel side (transmission M) via the output shaft 3 (output member), and in a state in which the press-fitting of the driving-side clutch plate 6 and the passive-side clutch plate 7 is released, transmission of the rotational force (driving force of the engine E) input to the clutch housing 2 to the output shaft 3 (output member) can be cut off.

[0061] In addition, as shown in Figure 9 , 10 As shown, the pressure member 5 is formed with a plurality of (three in this embodiment) insertion holes 5d throughout the circumferential direction, and a clutch spring S is inserted into each insertion hole 5d. As shown in Figure 2 The clutch spring S is housed in the insertion hole 5d and abuts against the fixed member 8 at one end, and is urged in a direction in which the driving-side clutch plate 6 and the passive-side clutch plate 7 are press-fitted. Furthermore, by operating a clutch operation unit not shown, press-fitting or release of the driving-side clutch plate 6 and the passive-side clutch plate 7 can be performed.

[0062] Furthermore, in this embodiment, as shown in Figure 5 , 6, 9, 10, a slope surface 4aa and a slope surface 4ab are formed in the first clutch member 4a, and slope surfaces 5a and 5b that oppose the slope surfaces 4aa and 4ab are formed in the pressure member 5. That is, the slope surface 4aa and the slope surface 5a abut to constitute a press-contact assisting cam, and the slope surface 4ab and the slope surface 5b abut to constitute a reverse torque limiter cam.

[0063] Also, when the rotational speed of the engine E rises to a state in which 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), as shown in Figure 20 (a), a rotational force in the a direction is applied to the pressure member 5, and thus, by the action of the press-contact assisting cam, a force in the c direction in the figure is generated in the pressure member 5. Thus, the pressure member 5 moves in a direction in which the flange portion 5c thereof further approaches the flange portion 4bb of the second clutch member 4b, and the press-contact force of the drive side clutch plate 6 and the passive side clutch plate 7 increases. Figure 2 , 3 The left side in the figure), the drive side clutch plate 6 and the passive side clutch plate 7 are pressed.

[0064] On the other hand, when a reverse torque occurs in which the rotation of the output shaft 3 exceeds the rotational speed of the input gear 1 and the clutch housing 2, as shown in Figure 20 (b), a rotational force in the b direction is applied to the clutch member 4, and thus, by the action of the reverse torque limiter cam, the pressure member 5 moves in the d direction in the figure, and the press-contact force of the drive side clutch plate 6 and the passive side clutch plate 7 is released. Thus, it is possible to avoid an adverse condition with respect to the power transmission device K and the power source (the engine E side) caused by the reverse torque.

[0065] As shown in Figures 11 to 19 , the centrifugal clutch unit 9 is provided with the weight member 10 that is movable from the inner diameter side position (see Figure 18 ) to the outer diameter side position (see Figure 19 ) by centrifugal force accompanying the rotation of the clutch housing 2, and is configured to be in a state in which the drive side clutch plate 6 and the passive side clutch plate 7 are pressed to transmit the driving force of the engine E to the wheels (the drive wheels T) when the weight member 10 is at the outer diameter side position, and to be able to cut off the transmission of the driving force of the engine E to the wheels (the drive wheels T) when the weight member 10 is at the inner diameter side position.

[0066] Specifically, the centrifugal clutch unit 9 is configured to have a counterweight member 10 composed of a shogi piece-shaped (block-shaped) member, a holding member 11 to which a support member 13 is attached, a press-fitting member 12, a first ball-shaped member 14, a second ball-shaped member 15, and a biasing member 16 composed of a coil spring. Note that the holding member 11 and the press-fitting member 12 are formed with a plurality of protrusions over the entire circumferential direction, and are fitted and attached to the cutout 2a of the clutch housing 2, like the drive-side clutch plate 6. Thus, the holding member 11 and the press-fitting member 12 are able to move in the axial direction of the clutch housing 2, respectively, and are able to be engaged in the rotational direction and rotate together with the clutch housing 2.

[0067] As shown in Figure 16 , the counterweight member 10 is composed of a shogi piece-shaped member having one face X and another face Y, as shown in the drawing and Figure 17 , the counterweight member 10 is configured to have a through-hole 10a formed through from the one face X to the other face Y, an insertion portion 10b formed on the other face Y, and a groove 10c formed on the one face X. As shown in Figure 18 , 19 , the counterweight member 10 is housed in the housing portion 11a of the holding member 11, is held at the inner diameter side position (see Figure 18 ) in a state where no centrifugal force is applied, and is moved to the outer diameter side position (see Figure 19 ) by being applied with a centrifugal force against the force of the biasing member 16.

[0068] The holding member 11 holds the counterweight member 10 so as to be movable between the inner diameter side position and the outer diameter side position, is composed of a circular ring-shaped member, as shown in Figure 13 , is configured to have a plurality of housing portions 11a formed over the entire circumferential direction and housing the counterweight member 10, a groove shape 11b formed inside the housing portion 11a, and a pressing face 11c. Each of the housing portions 11a is composed of a concave shape that matches the shape and the range of movement of the counterweight member 10, and is configured so that one end of the biasing member 16 is able to abut against the inner peripheral wall face 11aa thereof.

[0069] In addition, the support member 13 is fixed to the face of the holding member 11 on which the housing portion 11a is formed. As shown in Figure 14 , the support member 13 is formed with a holding portion 13a formed in the radial direction, and the counterweight member 10 is held to the holding member 11 by the holding portion 13a matching the groove 10c of the counterweight member 10. That is, the counterweight member 10 is formed with the groove 10c at the central position of the one face X thereof in the direction from the inner diameter side position to the outer diameter side position, and the counterweight member 10 is held so as to be movable in the radial direction (in the direction from the inner diameter side position to the outer diameter side position) by the holding portion 13a matching the groove 10c.

[0070] The pressure-contact member 12 moves in the direction of the stack of the driving-side clutch plate 6 and the driven-side clutch plate 7 (the direction of the arrow in the middle of the figure) by the weight member 10 moving from the inner diameter side position to the outer diameter side position, thereby pressure-contacting the driving-side clutch plate 6 and the driven-side clutch plate 7. Specifically, as shown in Figure 2 , 3 the pressure-contact member 12 is configured by a circular ring-shaped member, and is provided with gradient grooves 12a formed at a plurality of positions in the circumferential direction, groove shapes 12b formed at positions where the gradient grooves 12a are formed, and a pressing surface 12c. Figure 15

[0071] The gradient grooves 12a are formed at positions corresponding to the weight members 10, and are sloped upward from the inner side toward the outer side. Thus, in a state where the clutch housing 2 is stopped, the weight members 10 are held at the inner diameter side position by the force of the urging member 16, and if the clutch housing 2 rotates, centrifugal force is applied to the weight members 10 along the gradient grooves 12a, thereby moving the pressure-contact member 12 in a direction away from the holding member 11 (i.e., in a direction in which the driving-side clutch plate 6 and the driven-side clutch plate 7 are pressure-contacted).

[0072] Thus, if the weight members 10 are held in the middle while the holding member 11 and the pressure-contact member 12 are assembled, as shown in Figure 11 , 12 the gradient grooves 12a are located at positions corresponding to the weight members 10, and the pressure-contact member 12 moves in the direction of the arrow in the middle (the right side in the figure) by the weight members 10 moving from the inner diameter side position to the outer diameter side position by centrifugal force along the gradient grooves 12a, the pressing surface 12c formed in the pressure-contact member 12 presses the driving-side clutch plate 6 and the driven-side clutch plate 7 to be in a pressure-contacted state, and the holding member 11 moves in the direction opposite to the arrow in the middle (the left side in the figure) by the reaction force thereof, the pressing surface 11c formed in the holding member 11 pressure-contacts the auxiliary clutch plate 17. Figure 11 Figure 11 As shown in ,

[0073] the weight members 10 of the present embodiment are each housed in a housing portion 11a formed at a plurality of positions in the circumferential direction of the holding member 11 and are movable in the radial direction, and the urging member 16 is provided with a plurality of (two in the present embodiment) urging portions between the inner peripheral wall surface 11aa (see Figure 18 ) of the housing portion 11a and the weight member 10 in the circumferential direction, and applies 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 a flat surface that abuts against one end of the urging member 16, and the urging member 16 can be installed in a stable state. 19 Figure 13

[0074] ​​​Furthermore, the counterweight member 10 in this embodiment has a surface that faces the retaining member 11. Figure 17 The other side (Y) of the tube has an opening, through which the force-applying member 16 can be inserted for installation. Furthermore, by housing the counterweight member 10, with the force-applying member 16 inserted into the insertion portion 10b, in the receiving portion 11a of the retaining member 11, the force-applying member 16 is installed between the inner peripheral wall surface 11aa of the receiving portion 11a and the counterweight member 10. It should be noted that the force-applying member 16 is arranged such that 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, enabling force to be applied to the counterweight member 10 from the outer diameter side position toward the inner diameter side position.

[0075] The first spherical component 14 is composed of steel balls installed on the counterweight component 10, such as Figure 16 , 17 As shown, a portion protrudes from one opening 10aa (an opening with a small diameter on the X side) formed in the through hole 10a of the counterweight member 10, allowing it to contact and roll with the rolling surface of the pressing member 12. Furthermore, the second spherical member 15 is composed of a steel ball mounted on the counterweight member 10, as shown... Figure 16 , 17 As shown, a portion protrudes from the opening 10ab (the large-diameter opening on the Y side of the other side of the through hole 10a formed in the counterweight member 10) and is able to roll in contact with the rolling surface of the retaining member 11.

[0076] like Figure 17 As shown, in this embodiment, the through hole 10a is formed in a conical shape with the diameter continuously increasing from one opening 10aa (a small-diameter opening on the X-side) to the other opening 10ab (a large-diameter opening on the Y-side). The first spherical member 14 is prevented from detaching by the outer peripheral edges of the small-diameter openings (in this embodiment, one opening 10aa on the X-side) of both the one opening 10aa and the other opening 10ab. That is, in this embodiment, the first spherical member 14 and the second spherical member 15 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) depending on the inner diameter of the through hole 10a. This allows the small-diameter first spherical member 14 to roll while being prevented from detaching from the small-diameter side opening edge of the through hole 10a and contacting the inner peripheral surface of the through hole 10a.

[0077] On the other hand, such as Figure 11 , 12As shown, the second spherical member 15 is prevented from detaching by the rolling surface of the retaining member 11. Thus, the small-diameter first spherical member 14 is prevented from detaching by the opening edge on the small-diameter side of the through hole 10a, and the large-diameter second spherical member 15 is prevented from detaching by the rolling surface of the retaining member 11 with a portion protruding from the opening on the large-diameter side of the through hole 10a. It should be noted that in this embodiment, the large-diameter second spherical member 15 is assembled facing the rolling surface of the retaining member 11, but the second spherical member 15 can also be assembled facing the rolling surface of the crimping member 12. In this case, the small-diameter first spherical member 14 is prevented from detaching by the opening edge on the small-diameter side of the through hole 10a, and the large-diameter second spherical member 15 is prevented from detaching by the rolling surface of the crimping member 12 with a portion protruding from the opening on the large-diameter side of the through hole 10a.

[0078] like Figure 13 As shown, the rolling surface of retaining member 11 (in this embodiment, the rolling surface of the second spherical member 15) is formed by a groove shape 11b along the moving direction of counterweight member 10 (the direction connecting the inner diameter side position and the outer diameter side position), and as... Figure 15 As shown, the rolling surface of the pressing member 12 (in this embodiment, the rolling surface of the first spherical member 14) is formed by a groove shape 12b along the moving direction of the counterweight member 10 (the direction connecting the inner diameter side position and the outer diameter side position).

[0079] Moreover, such as Figure 16 , 18 As shown in Figure 19, in this embodiment, a plurality of first spherical members 14 and second spherical members 15 are formed throughout the circumference of the retaining member 11 (the width direction of the counterweight member 10) (in this embodiment, two first spherical members 14 and two second spherical members 15 are formed). As the counterweight member 10 moves, the first spherical members 14 and the second spherical members 15 can move along the groove shapes 11b and 12b while rolling in the through hole 10a.

[0080] The auxiliary clutch plate 17 is composed of an annular member with a diameter different from that of the driving-side clutch plate 6 and the driven-side clutch plate 7 (in this embodiment, it is smaller than the diameter of the driving-side clutch plate 6 and the driven-side clutch plate 7), such as... Figure 2 , 3 As shown, the output shaft 3 (output member) is inserted into the central opening 17a and is set to a fitted state, and is configured to have a pressed surface 17b opposite to the pressing surface 11c of the retaining member 11.

[0081] The auxiliary clutch plate 17 is pressed and engaged by the pressing surface 11c of the holding member 11 when the counterweight member 10 is in the outer diameter side position (i.e., when the driving side clutch plate 6 and the driven side clutch plate 7 are in the pressed state), and thus the driving force of the engine E can be transmitted to the output shaft 3. In addition, when the pressing force of the pressing surface 11c of the holding member 11 decreases and the pressing force is released when the counterweight member 10 is in the inner diameter side position (i.e., when the pressing force of the driving side clutch plate 6 and the driven side clutch plate 7 is in the released state), the transmission of the driving force of the engine E to the output shaft 3 can be cut off.

[0082] That is, when the counterweight member 10 moves to the outer diameter side position, the slope groove 12a functions as a cam, and the holding member 11 and the pressing member 12 move in a direction away from each other. Thus, the pressing surface 12c of the pressing member 12 presses and engages 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 engages the pressed surface 17b of the auxiliary clutch plate 17, and thus the driving force of the engine E is transmitted to the drive wheels T.

[0083] Furthermore, as shown in Figure 5 , 6 , the first clutch member 4a of the present embodiment is formed with an abutting surface 4ad at a portion of a surface opposite to the pressure member 5, and as shown in Figure 9 , 10 , the pressure member 5 is formed with an abutting surface 5e at a portion of a surface opposite to the first clutch member 4a, and in a state where the first clutch member 4a, the second clutch member 4b, and the pressure member 5 are assembled (a state where the transmission torque from the input gear 1 (input member) to the output shaft 3 (output member) is not transmitted), the abutting surface 4ad and the abutting surface 5e are brought into abutment, as shown in Figure 2 , 3 .

[0084] Thus, in the state where the abutting surface 4ad and the abutting surface 5e are in abutment, during the process in which the counterweight member 10 of the centrifugal clutch unit 9 moves from the inner diameter side position (see Figure 22 ) to the intermediate position (see Figure 23 ) 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, and thus the operation of the pressing auxiliary cam is limited.

[0085] After that, when the counterweight member 10 of the centrifugal clutch unit 9 moves from the intermediate position (see Figure 23 ) toward the outer diameter side position (see Figure 24) further moves, the driven side clutch plate 7 is pressed and connected by the flange portion 4bb of the second clutch member 4b, and the pressing force of the flange portion 4bb becomes the force of the clutch spring S or more, the second clutch member 4b and the pressure member 5 are moved in the axial direction (right direction in the figure) with respect to the first clutch member 4a, and the abutting surface 4ad of the first clutch member 4a and the abutting surface 5e of the pressure member 5 are separated. Note that, Figure 2 、 3 In the figure, the state in which the weight member 10 is in the outer diameter side position and the pressure member 5 is in the non-working position (clutch closed state) is shown. Figure 25

[0086] Thus, in the state in which the abutting surface 4ad and the abutting surface 5e are separated, during the process in which the weight member 10 of the centrifugal clutch unit 9 moves from the inner diameter side position to the outer diameter side position 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 allowed, and thus the working of the press connection assisting cam is allowed.

[0087] According to the power transmission device K of the present embodiment, the through hole 10a of the weight member 10 in the centrifugal clutch unit 9 is formed in a tapered shape from the one opening 10aa to the other opening 10ab, and the first ball member 14 is prevented from coming off by the outer peripheral edge portion of the small diameter opening of the one opening 10aa and the other opening 10ab, and thus the first ball member 14 can be easily and correctly installed in the weight member 10, and the manufacturing cost can be reduced.

[0088] In addition, the first ball member 14 and the second ball member 15 are constituted by ball members having different diameters from the inner diameter of the through hole 10a, and can roll in a state in which the inner peripheral surfaces of the through hole 10a are respectively contacted, and thus the first ball member 14 and the second ball member 15 can be stably rolled during the movement of the weight member 10, and smooth movement can be achieved. Also, the second ball member 15 of the present embodiment is prevented from coming off by the rolling surface of the holding member 11 or the press connection member 12, and thus the first ball member 14 and the second ball member 15 can be easily prevented from coming off.

[0089] Also, the rolling surface of the holding member 11 or the press connection member 12 is constituted by a groove shape (11b, 12b) along the moving direction of the weight member 10, and thus the prevention of the second ball member 15 on the large diameter opening side and the first ball member 14 on the small diameter opening side can be reliably performed respectively, and smoother movement of the weight member 10 can be achieved.

[0090] ​In addition, the counterweight member 10 of the present embodiment is housed in the housing portions 11a that are formed in the circumferential direction of the holding member 11, and is thus able to move in the radial direction. The urging member 16 is provided in the circumferential direction between the inner peripheral wall surface 11aa of the housing portion 11a and the counterweight member 10, and urges the counterweight member 10 from the outer diameter side toward the inner diameter side. Thus, the counterweight member 10 is able to be urged from the outer diameter side toward the inner diameter side with high precision, and is able to move stably in accordance with the centrifugal force.

[0091] In addition, the counterweight member 10 of the present embodiment is formed with a through portion 10b that is open to a surface opposite the holding member 11, and through which the urging member 16 is able to be inserted and fitted. Thus, the urging member 16 is able to be easily assembled with respect to the counterweight member 10. Furthermore, the counterweight member 10 of the present embodiment is formed with a groove 10c in the direction from the inner diameter side toward the outer diameter side, and the holding member 11 (specifically, the support member 13 that is fixed to the holding member 11 and is integrated therewith) is formed with a holding portion 13a that matches with the groove 10c and holds the counterweight member 10. Thus, the movement of the counterweight member 10 is able to be stably performed.

[0092] Furthermore, the centrifugal clutch unit 9 of the present embodiment is provided with a first spherical member 14 that protrudes from one of the openings 10aa of the through hole 10a of the counterweight member 10, and is able to roll in contact with the rolling surface (groove shape 12b) of the crimp member 12, and a second spherical member 15 that protrudes from the other of the openings 10ab of the through hole 10a of the counterweight member 10, and is able to roll in contact with the rolling surface (groove shape 11b) of the holding member 11. Thus, the movement of the counterweight member 10 is able to be more stably performed.

[0093] In particular, the holding member 11 or the crimp member 12 has a groove shape (11b, 12b) in the direction of movement of the counterweight member 10, and the groove shape (11b, 12b) is set as the rolling surface of the first spherical member 14 or the second spherical member 15. Thus, the movement of the counterweight member 10 is able to be more smoothly performed. Furthermore, the first spherical member 14 and the second spherical member 15 of the present embodiment are each formed in a plurality in the circumferential direction of the holding member 11 (in the width direction of the counterweight member 10). Thus, further stable movement of the counterweight member 10 is able to be sought.

[0094] The present embodiment has been described above, but the present application is not limited to this, and for example, a structure without the crimping assist cam (ramp surface 4aa and ramp surface 5a) and the reverse torque limiter cam (ramp surface 4ab and ramp surface 5b), a structure without the assist clutch plate 17 can also be used. In the present embodiment, the through-hole 10a is formed in a tapered shape, but a through-hole with the same diameter from one opening to the other opening can also be used, and the first spherical member 14 and the second spherical member 15 can be prevented from coming off by other anti-coming-off units and methods such as riveting.

[0095] Furthermore, in the present embodiment, in a state where the first clutch member 4a, the second clutch member 4b, and the pressure member 5 are assembled (a state where the transmission torque from the input gear 1 (input member) to the output shaft 3 (output member) is not transmitted), the abutting surface 4ad and the abutting surface 5e are abutted, but a state where these abutting surfaces 4ad and 5e are not abutted can also be used. Note that the power transmission device of the present application can be applied to various multi-plate clutch type power transmission devices other than two-wheeled motor vehicles, such as automobiles, three- or four-wheeled off-road vehicles, or general-purpose machines.

[0096] Industrial applicability

[0097] As long as it is a power transmission device of the type in which "a centrifugal clutch unit is configured to include a holding member that holds a weight member so as to be movable between an inner diameter side position and an outer diameter side position, a crimping member that moves toward the stacking direction of a driving side clutch plate and a driven side clutch plate to crimp the driving side clutch plate and the driven side clutch plate by movement of the weight member from the inner diameter side position to the outer diameter side position, and an urging member that urges the weight member from the outer diameter side position toward the inner diameter side position, the weight member is housed in a plurality of housing portions formed so as to be radially movable, and the urging member is provided in a plurality in the circumferential direction between the inner peripheral wall surface of the housing portion and the weight member to urge the weight member from the outer diameter side position toward the inner diameter side position," the power transmission device can also be applied to power transmission devices having different external shapes or power transmission devices to which other functions are added, and the like.

[0098] Explanation of reference numerals

[0099] 1 input gear (input member)

[0100] 2 clutch housing

[0101] 2a cutout

[0102] 3 output shaft (output member)

[0103] 4a first clutch member

[0104] 4aa slope surface (cam for press contact assisting)

[0105] 4ab slope surface (cam for reverse torque limiter)

[0106] 4ac protruding portion

[0107] 4ad abutting surface

[0108] 4b second clutch member

[0109] 4ba spline fitting portion

[0110] 4bb flange portion

[0111] 5 pressure member

[0112] 5a slope surface (cam for press contact assisting)

[0113] 5b slope surface (cam for reverse torque limiter)

[0114] 5c flange portion

[0115] 5d fitting hole

[0116] 5e abutting surface

[0117] 6 drive side clutch plate

[0118] 7 driven side clutch plate

[0119] 8 fixing member

[0120] 9 centrifugal clutch unit

[0121] 10 counterweight member

[0122] 10a through hole

[0123] 10aa one-side opening

[0124] 10ab other-side opening

[0125] 10b insertion portion

[0126] 10ba end wall surface

[0127] 10c slot

[0128] 11 holding member

[0129] 11a housing portion

[0130] 11aa inner peripheral wall surface

[0131] 11b slot shape

[0132] 11c pressing surface

[0133] 12 press contact member

[0134] 12a slope groove

[0135] 12b groove shape

[0136] 12c pressing surface

[0137] 13 support member

[0138] 13a holding portion

[0139] 14 first ball member

[0140] 15 second ball member

[0141] 16 urging member

[0142] 17 auxiliary clutch plate

[0143] 17a central opening

[0144] 17b pressed surface

[0145] S clutch spring

Claims

1. A power transmission device, comprising: The clutch assembly is housed in a clutch housing that rotates together with an input assembly that rotates with the driving force of the vehicle's engine and is equipped with a plurality of drive-side clutch plates, and is equipped with a plurality of passive-side clutch plates that alternate with the drive-side clutch plates, and is connected to an output assembly capable of rotating the vehicle's wheels. A pressure member is movable between a working position and a non-working position. The working position is a position in which the drive-side clutch plate and the driven-side clutch plate are pressed together, enabling the transmission of the engine's driving force to the wheels. The non-working position is a position in which the pressing force between the drive-side clutch plate and the driven-side clutch plate is released, enabling the transmission of the engine's driving force to the wheels to be cut off. The centrifugal clutch unit includes a counterweight member that can move from an inner diameter side position to an outer diameter side position by centrifugal force accompanying the rotation of the clutch housing. When the counterweight member is in the outer diameter side position, the drive-side clutch plate and the driven-side clutch plate are pressed together to transmit the driving force of the engine to the wheels. When the counterweight member is in the inner diameter side position, the pressing force between the drive-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 wheels. The power transmission device is characterized in that... The centrifugal clutch unit has: A retaining member having a receiving portion for accommodating the counterweight member, thereby retaining the counterweight member so that it can move between the inner diameter side position and the outer diameter side position; The pressing member moves from the inner diameter side position to the outer diameter side position via the counterweight member, and moves in the stacking direction of the driving-side clutch plate and the driven-side clutch plate, thereby pressing the driving-side clutch plate and the driven-side clutch plate together; and The force-applying component applies force to the counterweight component from the outer diameter side towards the inner diameter side. The counterweight member has an opening on the side opposite to the retaining member that opens toward the retaining member, and the force-applying member is disposed in the opening.

2. The power transmission device according to claim 1, characterized in that, The centrifugal clutch unit has a support member that is fixed to the retaining member. The counterweight component has a groove formed in the direction from the inner diameter side position to the outer diameter side position. The support member has a retaining portion that matches the groove and holds the counterweight member.

3. The power transmission device according to claim 1 or 2, characterized in that, The centrifugal clutch unit is configured to include: The first spherical member has a portion that protrudes from an opening on one side of the through hole formed in the counterweight member and is able to contact the rolling surface of the pressing member and roll. and The second spherical member has a portion that protrudes from an opening on the other side of the through hole formed in the counterweight member, allowing it to contact the rolling surface of the retaining member and roll.

4. The power transmission device according to claim 3, characterized in that, The retaining member or the pressing member has a groove shape along the moving direction of the counterweight member, and the groove shape is set as the rolling surface of the first spherical member or the second spherical member.

5. The power transmission device according to claim 3, characterized in that, The first spherical member and the second spherical member are formed in multiples along the circumference of the retaining member.

6. The power transmission device according to claim 5, characterized in that, The opening of the counterweight component is located at the position where the second spherical component is clamped.

7. The power transmission device according to claim 5, characterized in that, The counterweight component has multiple openings.

8. A power transmission device, comprising: The clutch assembly is housed in a clutch housing that rotates together with an input assembly that rotates with the driving force of the vehicle's engine and is equipped with a plurality of drive-side clutch plates, and is equipped with a plurality of passive-side clutch plates that alternate with the drive-side clutch plates, and is connected to an output assembly capable of rotating the vehicle's wheels. A pressure member is movable between a working position and a non-working position. The working position is a position in which the drive-side clutch plate and the driven-side clutch plate are pressed together, enabling the transmission of the engine's driving force to the wheels. The non-working position is a position in which the pressing force between the drive-side clutch plate and the driven-side clutch plate is released, enabling the transmission of the engine's driving force to the wheels to be cut off. The centrifugal clutch unit includes a counterweight member that can move from an inner diameter side position to an outer diameter side position by centrifugal force accompanying the rotation of the clutch housing. When the counterweight member is in the outer diameter side position, the drive-side clutch plate and the driven-side clutch plate are pressed together to transmit the driving force of the engine to the wheels. When the counterweight member is in the inner diameter side position, the pressing force between the drive-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 wheels. The power transmission device is characterized in that... The centrifugal clutch unit has: A retaining member is provided to hold the counterweight member so that it can move between the inner diameter side position and the outer diameter side position. The pressing member moves from the inner diameter side position to the outer diameter side position through the counterweight member and moves in the stacking direction of the driving side clutch plate and the driven side clutch plate, thereby pressing the driving side clutch plate and the driven side clutch plate together. The force-applying member applies force to the counterweight member from the outer diameter side position toward the inner diameter side position; and The first spherical member has a portion that protrudes from an opening on one side of the through hole formed in the counterweight member and is able to contact the rolling surface of the pressing member and roll. and The second spherical member has a portion that protrudes from an opening on the other side of the through hole formed in the counterweight member, allowing it to contact the rolling surface of the retaining member and roll. Multiple through holes are formed on the counterweight component along the width direction of the counterweight component. The counterweight member has an insertion portion for receiving the force-applying member in the portion sandwiched between the openings of the plurality of through holes on the other side.

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