Centrifugal clutch device

Abstract

To provide a centrifugal clutch device that can be compacted in the axial direction.SOLUTION: A centrifugal clutch device includes a first rotating member, a centrifugal weight, and a second rotating member. The centrifugal weight is configured to rotate integrally with the first rotating member. The second rotating member is disposed to be rotatable relative to the first rotating member. The first rotating member includes a body portion and a press-fit portion. The body portion has an opening at a center. The press-fit portion has a spline hole and a serration portion. The serration portion is press-fitted into the opening of the body portion.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a centrifugal clutch device. [Background technology]

[0002] A centrifugal clutch device is configured to transmit torque from a drive source when the rotation speed of the drive source reaches or exceeds a predetermined value. Such a centrifugal clutch device is used in motorcycles and the like. For example, the centrifugal clutch device described in Patent Document 1 has a sleeve hub that rotates integrally with a driven shaft. The driven shaft is spline-fitted into the sleeve hub. In addition, the sleeve hub has a cam surface for axially moving a centrifugal roller that moves radially outward by centrifugal force. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2012-241804 A Summary of the Invention [Problem to be solved by the invention]

[0004] In the centrifugal clutch device described above, there is a demand for dividing the rotating member that rotates integrally with the shaft into two members, an inner peripheral portion and an outer peripheral portion. In this case, it is considered to integrally form the inner peripheral portion and the outer peripheral portion by insert molding. However, when the rotating member is produced by insert molding, a problem occurs in that the size of the rotating member in the axial direction becomes large.

[0005] SUMMARY OF THE PRESENT EMBODIMENT An object of the present invention is to provide a centrifugal clutch device that can be made compact in the axial direction. [Means for solving the problem]

[0006] A centrifugal clutch device according to a first aspect includes a first rotating member, a centrifugal element, and a second rotating member. The centrifugal element is configured to rotate integrally with the first rotating member. The second rotating member is arranged to be rotatable relative to the first rotating member. The first rotating member has a main body portion and a press-fit portion. The main body portion has an opening portion at its center. The press-fit portion has a spline hole and a serration portion. The serration portion is press-fitted into the opening portion of the main body portion.

[0007] According to this configuration, the press-fit portion and the main body portion are joined by serrations, so that the axial direction can be made more compact than in the case of insert molding, for example.

[0008] A centrifugal clutch device according to a second aspect is the centrifugal clutch device according to the first aspect, and is configured as follows: The press-fit portion has a tapered portion and an intermediate portion. The tapered portion has an outer diameter that decreases with increasing distance from the serration portion. The intermediate portion is disposed between the serration portion and the tapered portion in the axial direction. The intermediate portion has a constant outer diameter.

[0009] A centrifugal clutch device according to a third aspect is the centrifugal clutch device according to the second aspect, and is configured as follows: The press-fit portion has a groove portion extending in the circumferential direction between the serration portion and the intermediate portion.

[0010] A centrifugal clutch device according to a fourth aspect is the centrifugal clutch device according to the third aspect, and is configured as follows: the press-fit portion protrudes into a space defined by the first rotating member and the second rotating member, and the groove portion is disposed in the space.

[0011] A centrifugal clutch device according to a fifth aspect is the centrifugal clutch device according to the fourth aspect, further comprising a one-way clutch. The second rotating member has a boss portion extending in the axial direction. The one-way clutch is disposed radially inward from the boss portion. The press-fit portion is disposed axially spaced from the one-way clutch.

[0012] A centrifugal clutch device according to a sixth aspect is the centrifugal clutch device according to the fifth aspect, and is configured as follows: The press-fit portion is disposed radially inward with respect to the boss portion.

[0013] A centrifugal clutch device according to a seventh aspect is the centrifugal clutch device according to any one of the first to sixth aspects, further comprising a clutch portion and a pressure plate. The clutch portion is configured to transmit torque between the first rotating member and the second rotating member in an interruptible manner. The pressure plate is arranged to be rotatable relative to the first rotating member and to be movable in the axial direction. The pressure plate is configured to press the clutch portion. The centrifugal element is configured to receive centrifugal force and press the pressure plate toward the clutch portion.

[0014] A centrifugal clutch device according to an eighth aspect is the centrifugal clutch device according to the seventh aspect, further comprising a cam mechanism. The cam mechanism is configured to move the pressure plate toward the clutch portion when the pressure plate rotates relative to the first rotating member in the forward rotation direction.

[0015] A centrifugal clutch device according to a ninth aspect is the centrifugal clutch device according to the seventh or eighth aspect, and is configured as follows: The main body has a cam surface. The cam surface is inclined so as to approach the pressure plate radially outward. The main body has an outer circumferential portion on which the cam surface is formed, and the plate thickness increases radially outward. Effect of the Invention

[0016] According to the present invention, compactness in the axial direction is possible. [Brief description of the drawings]

[0017] [Figure 1] FIG. [Diagram 2] FIG. [Diagram 3] FIG. [Figure 4] FIG. [Diagram 5] FIG. 4 is a perspective view of a first rotating member and a pressure plate. [Figure 6] FIG. [Figure 7] FIG. 4 is a schematic diagram showing a one-way clutch in an engaged state. [Figure 8] FIG. 4 is a schematic diagram showing a one-way clutch in a disengaged state. [Figure 9] FIG. 4 is a cross-sectional view of a first rotating member and a pressure plate. [Figure 10] FIG. [Figure 11] FIG. 11 is a schematic diagram of a drive unit according to a modified example. [Figure 12] FIG. 13 is a schematic diagram showing a one-way clutch (disengaged state) according to a modified example. [Figure 13] FIG. 13 is a schematic diagram showing a one-way clutch (engaged state) according to a modified example. [Figure 14] FIG. 11 is a schematic diagram of a cam mechanism according to a modified example. [Figure 15] FIG. 11 is a cross-sectional view of a centrifugal element according to a modified example. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0018] The centrifugal clutch device 100 according to this embodiment will be described below with reference to the drawings. In the following description, the term "axis" refers to the rotation axis O of the centrifugal clutch device 100. The term "circumference" refers to the circumference of a circle centered on the rotation axis of the centrifugal clutch device, and the term "diameter" refers to the diameter of a circle centered on the rotation axis. The forward rotation direction refers to the direction in which each member rotates when the vehicle is moved forward. The reverse rotation direction refers to the direction in which each member rotates when the vehicle is moved backward.

[0019] As shown in Fig. 1, the centrifugal clutch device 100 is configured as a part of a drive unit 101 mounted on an electric motorcycle or the like. The drive unit 101 is configured to drive a drive wheel 102. The drive unit 101 has an electric motor 103 and a power transmission device 104. The centrifugal clutch device 100 is configured as a part of the power transmission device 104.

[0020] <Electric motor> The electric motor 103 is a drive source of the drive unit 101. The electric motor 103 drives the drive wheels 102 by receiving power supplied from a battery or the like.

[0021] <Power transmission device> The power transmission device 104 is configured to transmit torque between the electric motor 103 and the drive wheels 102. That is, the power transmission device 104 is configured to transmit the torque output by the electric motor 103 to the drive wheels 102. In addition, the power transmission device 104 is configured to transmit the torque of the drive wheels 102 to the electric motor 103 during deceleration, and to activate regenerative braking.

[0022] The power transmission device 104 includes a first shaft 105 , a second shaft 106 , a first gear train 10 , and a second gear train 20 .

[0023] <First shaft> The first shaft 105 is configured to receive torque from the electric motor 103, which is a drive source. The first shaft 105 is arranged to be rotatable. The first shaft 105 rotates integrally with, for example, the rotor of the electric motor 103. The first shaft 105 is arranged coaxially with the rotation axis of the electric motor 103.

[0024] <Second shaft> The second shaft 106 is rotatably arranged. The second shaft 106 extends substantially parallel to the first shaft 105. The second shaft 106 is arranged downstream of the first shaft 105 in a torque transmission path from the electric motor 103 to the drive wheels 102. The second shaft 106 receives torque from the first shaft 105 via the first gear train 10 or the second gear train 20.

[0025] <First gear train> The first gear train 10 is configured to transmit torque from the first shaft 105 to the second shaft 106. However, the first gear train 10 is configured not to transmit torque from the second shaft 106 to the first shaft 105.

[0026] The first gear train 10 has a first gear 10a, a second gear 10b, and a first clutch 10c. The first gear 10a is attached to a first shaft 105. In particular, the first gear 10a rotates integrally with the first shaft 105. The first gear 10a is fixed to the first shaft 105. Note that the first gear 10a may be integrally formed with the first shaft 105 by a single member.

[0027] The second gear 10b is attached to the second shaft 106. In detail, the second gear 10b is attached to the second shaft 106 via a first clutch 10c. The second gear 10b meshes with the first gear 10a.

[0028] The first clutch 10c is configured to transmit only torque in the forward rotation direction from the first shaft 105 to the second shaft 106. The first clutch 10c does not transmit torque in the reverse rotation direction from the first shaft 105 to the second shaft 106. The first clutch 10c is also configured not to transmit torque in the forward rotation direction and torque in the reverse rotation direction from the second shaft 106 to the first shaft 105.

[0029] As shown in Fig. 2, for example, the first clutch 10c has an inner ring 10d, an outer ring 10e, a roller 10f, a coil spring 10g, and a retaining member 10h. The inner ring 10d, the outer ring 10e, and the retaining member 10h are rotatable relative to one another. The inner ring 10d is configured to rotate integrally with the second shaft 106. The outer ring 10e is configured to rotate integrally with the second gear 10b. The outer ring 10e may be integrally formed with the second gear 10b by a single member.

[0030] When the outer ring 10e rotates relative to the inner ring 10d in the forward rotation direction, the rollers 10f mesh between the inner ring 10d and the outer ring 10e, and are in an engaged state. On the other hand, when the outer ring 10e rotates relative to the inner ring 10d in the reverse rotation direction, the rollers 10f do not mesh between the inner ring 10d and the outer ring 10e, and are in a disengaged state. Also, when the inner ring 10d rotates relative to the outer ring 10e in both the forward rotation direction and the reverse rotation direction, the rollers 10f do not mesh between the inner ring 10d and the outer ring 10e, and are in a disengaged state.

[0031] <Second gear train> As shown in FIG. 1, the second gear train 20 is configured to have a smaller gear ratio than the first gear train 10. The second gear train 20 is configured to transmit torque from the first shaft 105 to the second shaft 106. In detail, the second gear train 20 transmits torque from the first shaft 105 to the second shaft 106 when the rotation speed becomes greater than a predetermined value. In detail, the second gear train 20 transmits torque from the first shaft 105 to the second shaft 106 when the rotation speed of the first rotating member 1 of the centrifugal clutch device 100 becomes greater than a predetermined value. The second gear train 20 is installed in parallel with the first gear train 10 between the first shaft 105 and the second shaft 106.

[0032] The second gear train 20 has a third gear 20a, a fourth gear 20b, and a centrifugal clutch device 100. The second gear train 20 is configured to transmit torque from a first shaft 105 to a second shaft 106 via the centrifugal clutch device 100 in an interruptable manner.

[0033] The third gear 20a is attached to the first shaft 105. Specifically, the third gear 20a rotates integrally with the first shaft 105. The third gear 20a is fixed to the first shaft 105. The third gear 20a may be integrally formed with the first shaft 105 by a single member. The third gear 20a has a larger number of teeth than the first gear 10a. Also, the third gear 20a has a larger diameter than the first gear 10a.

[0034] The fourth gear 20b is attached to the second shaft 106. The fourth gear 20b is attached to the second shaft 106 via a needle bearing or the like. That is, the fourth gear 20b is rotatable relative to the second shaft 106.

[0035] The fourth gear 20b is attached to the second shaft 106 via the centrifugal clutch device 100. When the centrifugal clutch device 100 is in a clutch-on state, the fourth gear 20b rotates integrally with the second shaft 106. On the other hand, when the centrifugal clutch device 100 is in a clutch-off state, the fourth gear 20b is capable of rotating relative to the second shaft 106. The fourth gear 20b meshes with the third gear 20a. The fourth gear 20b has fewer teeth than the second gear 10b. In addition, the fourth gear 20b has a smaller diameter than the second gear 10b.

[0036] <Centrifugal clutch device> The centrifugal clutch device 100 is configured to be attached to the second shaft 106. The centrifugal clutch device 100 is configured to transmit torque when its rotation speed exceeds a predetermined value. In particular, the centrifugal clutch device 100 is configured to transmit torque when the rotation speed of the first rotating member 1 of the centrifugal clutch device 100 exceeds a predetermined value. That is, when the rotation speed of the first rotating member 1 exceeds a predetermined value, the centrifugal clutch device 100 enters a clutch-on state and transmits torque. On the other hand, when the rotation speed of the first rotating member 1 is equal to or lower than the predetermined value, the centrifugal clutch device 100 enters a clutch-off state and interrupts torque transmission.

[0037] As shown in FIG. 3, the centrifugal clutch device 100 has a first rotating member 1, a second rotating member 2, a one-way clutch 3, a clutch portion 4, a pressure plate 5, a pressure-receiving plate 6, a plurality of centrifugal elements 7, and a cam mechanism 8.

[0038] The first rotating member 1 is configured to rotate integrally with the second shaft 106. The first rotating member 1 is disk-shaped. The first rotating member 1 has a main body portion 11 and a press-fit portion 12.

[0039] As shown in FIG. 4, the main body 11 is disk-shaped and has an opening 110 in the center. The main body 11 has a plurality of accommodating sections 111. The accommodating sections 111 are arranged on the outer periphery of the main body 11. The accommodating sections 111 are arranged in the circumferential direction. The accommodating sections 111 are recesses that open toward the clutch section 4. Of the surfaces that define the accommodating sections 111, the surface that faces the clutch section 4 is a cam surface 112. In other words, the first rotating member 1 has the cam surface 112.

[0040] The cam surface 112 is inclined so as to approach the pressure plate 5 radially outward. That is, the cam surface 112 is inclined so as to face the pressure plate 5 in the axial direction and also to face the radially inward. Note that the surface of the main body 11 opposite the cam surface 112 is not inclined and extends perpendicular to the axial direction. Therefore, the thickness of the main body 11 gradually increases radially outward at the outer periphery where the cam surface 112 is formed.

[0041] 4 and 5, the main body 11 has a plurality of abutment surfaces 113. Each abutment surface 113 faces radially inward. Each abutment surface 113 abuts against the pressure-receiving plate 6 in the radial direction. In this manner, each abutment surface 113 abuts against the pressure-receiving plate 6 in the radial direction, thereby positioning the pressure-receiving plate 6 in the radial direction with respect to the first rotating member 1. In other words, it is possible to prevent the pressure-receiving plate 6 from being attached to the first rotating member 1 in an eccentric state.

[0042] The contact surfaces 113 are disposed at intervals from one another in the circumferential direction. In detail, the main body 11 has a plurality of protruding portions 114. The protruding portions 114 protrude toward the pressure-receiving plate 6 in the axial direction. The protruding portions 114 have the contact surfaces 113. In this embodiment, the surfaces of the protruding portions 114 that face radially inward are the contact surfaces 113.

[0043] The contact surface 113 is disposed radially outward from a boss portion 22 (more specifically, a second cylindrical portion 221) described later. The contact surface 113 is disposed so as to overlap with the pressure plate 5 when viewed in the radial direction. The contact surface 113 is also disposed so as to overlap with the one-way clutch 3 when viewed in the radial direction.

[0044] The press-fit portion 12 is cylindrical. The press-fit portion 12 has a spline hole 120 that penetrates in the axial direction. The second shaft 106 is fitted into the spline hole 120. Therefore, the first rotating member 1 rotates integrally with the second shaft 106.

[0045] The press-fit portion 12 is press-fitted into the opening 110 of the main body portion 11. The press-fit portion 12 has serrations formed on its outer circumferential surface. More specifically, the press-fit portion 12 has a serration portion 121. The serration portion 121 is a portion that is press-fitted into the opening 110 of the main body portion 11. Serrations are formed on the outer circumferential surface of this serration portion 121. For this reason, the press-fit portion 12 rotates integrally with the main body portion 11.

[0046] The press-fit portion 12 has a tapered portion 122, an intermediate portion 123, and a groove portion 124. The tapered portion 122 constitutes one end portion of the press-fit portion 12 in the axial direction. The outer diameter of the tapered portion 122 gradually decreases as it moves away from the serration portion 121.

[0047] The intermediate portion 123 is disposed between the serration portion 121 and the tapered portion 122 in the axial direction. The intermediate portion 123 is adjacent to the tapered portion 122. The outer diameter of the intermediate portion 123 is constant in the axial direction. The groove portion 124 is formed between the serration portion 121 and the intermediate portion 123 in the axial direction. The groove portion 124 is annular and extends in the circumferential direction.

[0048] The press-fit portion 12 protrudes from the main body portion 11 toward the second rotating member 2 in the axial direction. In detail, the press-fit portion 12 protrudes into the space surrounded by the first rotating member 1 and the second rotating member 2. In addition, the tapered portion 122 and the intermediate portion 123 of the press-fit portion 12 protrude. In addition, the groove portion 124 of the press-fit portion 12 is disposed in the space surrounded by the first rotating member 1 and the second rotating member 2. In this manner, a part of the press-fit portion 12 protrudes, and the tip portion thereof is the tapered portion 122, so that the oil supplied from the second shaft 106 to the one-way clutch 3 can be guided radially outward. The press-fit portion 12 is disposed at a distance from the one-way clutch 3 in the axial direction.

[0049] 3, the second rotating member 2 is disposed so as to be rotatable relative to the first rotating member 1. The second rotating member 2 is configured so as to transmit torque between the second rotating member 2 and the first rotating member 1 via a clutch portion 4. The second rotating member 2 is configured so as to rotate integrally with the fourth gear 20b.

[0050] The second rotating member 2 has a cover portion 21 and a boss portion 22. The cover portion 21 is attached to the boss portion 22 with a bolt or the like. The cover portion 21 has a disk portion 211 and a first cylindrical portion 212. The disk portion 211 has an opening 213 in the center.

[0051] The first cylindrical portion 212 extends in the axial direction from the outer circumferential end of the disc portion 211. In detail, the first cylindrical portion 212 extends in the axial direction from the disc portion 211 toward the first rotating member 1. The first cylindrical portion 212 has a plurality of notches 214 extending in the axial direction. The plurality of notches 214 are arranged in the circumferential direction.

[0052] The boss portion 22 has a cylindrical shape extending in the axial direction. Specifically, the boss portion 22 has a second cylindrical portion 221, a flange portion 222, and an insertion portion 223. The second cylindrical portion 221 extends in the axial direction. The press-fit portion 12 is disposed radially inward with respect to the boss portion 22. Specifically, the press-fit portion 12 is disposed radially inward with respect to the second cylindrical portion 221.

[0053] The second cylindrical portion 221 overlaps with a part of the first rotating member 1 when viewed in the radial direction. The second cylindrical portion 221 overlaps with the clutch portion 4 when viewed in the radial direction. The second cylindrical portion 221 overlaps with the centrifugal element 7 when viewed in the radial direction. The second cylindrical portion 221 is disposed radially inward with respect to the clutch portion 4 and the centrifugal element 7.

[0054] The boss portion 22 has an oil discharge hole 224. The oil discharge hole 224 is formed in the second cylindrical portion 221. The oil discharge hole 224 penetrates the second cylindrical portion 221 in the radial direction. Oil supplied to the one-way clutch 3 via the second shaft 106 or the like is discharged radially outward through the oil discharge hole 224. The oil discharge hole 224 is inclined radially outward toward the first rotating member 1. In other words, the oil discharge hole 224 is inclined so as to guide the oil discharged radially outward toward the first rotating member 1.

[0055] The flange portion 222 protrudes radially outward from the second cylindrical portion 221. The flange portion 222 is annular. The cover portion 21 is fixed to the flange portion 222 by bolts or the like.

[0056] The insertion portion 223 extends in the axial direction toward the opposite side to the second cylindrical portion 221 (the right side in FIG. 3) with respect to the flange portion 222. That is, the second cylindrical portion 221 extends in the axial direction toward the first rotating member 1 with respect to the flange portion 222, and the insertion portion 223 extends in the axial direction away from the first rotating member 1 with respect to the flange portion 222.

[0057] Fig. 6 is a cross-sectional view of the second rotating member 2. As shown in Fig. 6, the insertion portion 223 is inserted into the opening 213 of the cover portion 21 and passes through the opening 213. The insertion portion 223 has a contact portion 223a and a guide portion 223b. The contact portion 223a contacts the inner circumferential surface of the cover portion 21 that defines the opening 213. The contact portion 223a has a constant outer diameter along the axial direction.

[0058] The outer diameter of the guide portion 223b gradually decreases as it moves away from the contact portion 223a. The guide portion 223b is adjacent to the contact portion 223a. The contact portion 223a and the guide portion 223b are arranged in this order from the flange portion 222 side.

[0059] The boss portion 22 has a splined hole 225. The splined hole 225 extends in the axial direction. The fourth gear 20b is spline-fitted into the splined hole 225. Therefore, the fourth gear 20b rotates integrally with the second rotating member 2.

[0060] 3, the one-way clutch 3 is configured to transmit torque between the second shaft 106 and the second rotating member 2. In particular, the one-way clutch 3 is configured to transmit torque in the forward rotation direction from the second shaft 106 to the first shaft 105. The one-way clutch 3 transmits torque in the forward rotation direction from the second shaft 106 to the second rotating member 2.

[0061] The one-way clutch 3 is configured not to transmit torque in the forward rotation direction from the first shaft 105 to the second shaft 106. In other words, the one-way clutch 3 does not transmit torque in the forward rotation direction from the second rotating member 2 to the second shaft 106.

[0062] Moreover, the one-way clutch 3 is configured to transmit torque in the reverse rotation direction from the first shaft 105 to the second shaft 106. That is, the one-way clutch 3 is configured to transmit torque in the reverse rotation direction from the second rotating member 2 to the second shaft 106.

[0063] The one-way clutch 3 has an inner ring 31 , an outer ring 32 , and a plurality of rollers 33 .

[0064] The inner ring 31 is configured to rotate integrally with the second shaft 106. For example, the inner ring 31 has a splined hole 311, and the second shaft 106 fits into the splined hole 311 of the inner ring 31. The second shaft 106 also fits into the splined hole 120 of the first rotating member 1.

[0065] The outer ring 32 is disposed radially outward from the inner ring 31. The outer ring 32 is configured to rotate integrally with the second rotating member 2. In this embodiment, the outer ring 32 is formed by the second cylindrical portion 221 of the second rotating member 2. Note that the outer ring 32 may be configured by a member separate from the second cylindrical portion 221, and may be fixed to rotate integrally with the second cylindrical portion 221.

[0066] Each roller 33 is disposed between the inner ring 31 and the outer ring 32. Figure 7 is a schematic diagram showing the one-way clutch 3 in a torque transmission state, and Figure 8 is a schematic diagram showing the one-way clutch 3 in a torque transmission interruption state.

[0067] 7, when the inner ring 31 rotates relative to the outer ring 32 in the forward rotation direction, the rollers 33 mesh with each other between the inner ring 31 and the outer ring 32, transmitting torque between the inner ring 31 and the outer ring 32. That is, torque in the forward rotation direction is transmitted from the inner ring 31 to the outer ring 32.

[0068] On the other hand, as shown in Fig. 8, when the outer ring 32 rotates relative to the inner ring 31 in the forward rotation direction, the rollers 33 are disengaged between the inner ring 31 and the outer ring 32 and do not transmit torque between the inner ring 31 and the outer ring 32. In other words, torque is not transmitted from the outer ring 32 to the inner ring 31. In this way, when the one-way clutch 3 rotates in the forward rotation direction, it transmits torque from the second shaft 106 to the first shaft 105 but does not transmit torque from the first shaft 105 to the second shaft 106.

[0069] When the one-way clutch 3 rotates in the reverse rotation direction, that is, when the vehicle moves backward, the one-way clutch 3 transmits torque from the first shaft 105 to the second shaft 106. In detail, as shown in Fig. 7, when the one-way clutch 3 rotates in the reverse rotation direction, the outer ring 23 rotates relative to the inner ring 31 in the reverse rotation direction, so that the rollers 33 mesh with each other between the inner ring 31 and the outer ring 32, and transmit torque between the inner ring 31 and the outer ring 32. That is, the torque is transmitted from the outer ring 32 to the inner ring 31.

[0070] 3, the one-way clutch 3 is disposed so as to overlap with the centrifugal element 7 when viewed in the radial direction. The one-way clutch 3 is disposed radially inward with respect to the centrifugal element 7. The one-way clutch 3 is disposed radially inward with respect to the boss portion 22.

[0071] The clutch unit 4 is configured to transmit torque in an interruptible manner between the first rotating member 1 and the second rotating member 2. When the clutch unit 4 is in a clutch-on state, it transmits torque between the first rotating member 1 and the second rotating member 2. On the other hand, when the clutch unit 4 is in a clutch-off state, it interrupts the transmission of torque between the first rotating member 1 and the second rotating member 2.

[0072] The clutch portion 4 has a plurality of first clutch discs 41 and second clutch discs 42. The first clutch discs 41 and the second clutch discs 42 are annular. The first clutch discs 41 and the second clutch discs 42 are disposed between the pressure plate 5 and the pressure-receiving plate 6 in the axial direction. The first clutch discs 41 and the second clutch discs 42 are disposed alternately in the axial direction.

[0073] The first clutch disc 41 is movable in the axial direction but is unable to rotate relative to the second rotating member 2. That is, the first clutch disc 41 rotates integrally with the second rotating member 2. In detail, a plurality of engagement protrusions that protrude radially outward are formed on the outer periphery of the first clutch disc 41. The engagement protrusions mesh with notches 214 formed in the first cylindrical portion 212 of the second rotating member 2. Friction materials 43 are attached to both sides of the first clutch disc 41.

[0074] The second clutch disc 42 has a plurality of engagement protrusions formed at its inner circumferential end portion, which protrude radially inward. The engagement protrusions mesh with grooves 50 formed in the pressure plate 5. Therefore, the second clutch disc 42 is movable in the axial direction with respect to the pressure plate 5 but is unable to rotate relative thereto. In other words, the second clutch disc 42 rotates integrally with the pressure plate 5.

[0075] The pressure plate 5 is disposed between the centrifugal element 7 and the second rotating member 2 in the axial direction. In detail, the pressure plate 5 is disposed between the clutch portion 4 and the centrifugal element 7 in the axial direction.

[0076] The pressure plate 5 is disposed so as to be movable in the axial direction. The pressure plate 5 is configured to press the clutch portion 4 in the axial direction. Upon receiving an axial load from the centrifugal element 7 and an axial thrust from the cam mechanism 8, the pressure plate 5 moves in the axial direction toward the clutch portion 4 and presses the clutch portion 4.

[0077] The centrifugal clutch device 100 has a plurality of biasing members 51. Each biasing member 51 is disposed between the pressure plate 5 and the pressure-receiving plate 6. Each biasing member 51 biases the pressure plate 5 in the axial direction away from the clutch portion 4 and the pressure-receiving plate 6. As shown in FIG. 5, the biasing member 51 is disposed between a pair of adjacent contact surfaces 113 in the circumferential direction. That is, the biasing members 51 and the contact surfaces 113 are disposed alternately in the circumferential direction. The biasing members 51 are, for example, coil springs.

[0078] 3 and 5, the pressure plate 5 is disposed so as to be rotatable relative to the first rotating member 1. The pressure plate 5 is also disposed so as to be rotatable relative to the second rotating member 2.

[0079] The pressure plate 5 has a first annular body portion 52 and a third cylindrical portion 53. The first annular body portion 52 extends in the circumferential direction. The first annular body portion 52 is disposed between the centrifugal element 7 and the clutch portion 4 in the axial direction.

[0080] The third cylindrical portion 53 extends in the axial direction from the inner peripheral end of the first annular main body portion 52. In detail, the third cylindrical portion 53 extends in the axial direction from the first annular main body portion 52 toward the second rotating member 2. The third cylindrical portion 53 is disposed inside the first cylindrical portion 212 in the radial direction. The clutch portion 4 is disposed between the first cylindrical portion 212 and the third cylindrical portion 53 in the radial direction. The third cylindrical portion 53 has a plurality of groove portions 50 extending in the axial direction. The plurality of groove portions 50 are arranged in the circumferential direction.

[0081] The pressure plate 5 has a plurality of base portions 54 and a plurality of protruding portions 55. Each base portion 54 extends radially inward from the inner circumferential surface of the third cylindrical portion 53. Each base portion 54 is disposed at intervals from one another in the circumferential direction. Each protruding portion 55 protrudes from each base portion 54 in the axial direction. The biasing member 51 is attached to the protruding portion 55.

[0082] 3, the pressure plate 6 is disposed between the second rotating member 2 and the pressure plate 5 in the axial direction. In detail, the pressure plate 6 is disposed between the second rotating member 2 and the clutch portion 4 in the axial direction. The pressure plate 6 is disposed between the first cylindrical portion 212 and the second cylindrical portion 221 in the radial direction.

[0083] The pressure plate 6 has an opening 60 in the center (see FIG. 9). The second cylindrical portion 221 extends through this opening 60.

[0084] The pressure plate 6 is configured to cooperate with the pressure plate 5 to sandwich the clutch portion 4 in the axial direction. The pressure plate 6 is fixed to the first rotating member 1. The centrifugal clutch device 100 has a plurality of bolts 61, and each of the bolts 61 fastens the first rotating member 1 and the pressure plate 6. Therefore, the pressure plate 6 rotates integrally with the first rotating member 1. In addition, the pressure plate 6 is immovable in the axial direction.

[0085] The pressure plate 6 has a second annular body portion 62 and a plurality of pillar portions 63. The second annular body portion 62 extends in the circumferential direction. The second annular body portion 62 is disposed between the disk portion 211 and the clutch portion 4 in the axial direction. The clutch portion 4 is disposed between the first annular body portion 52 and the second annular body portion 62 in the axial direction.

[0086] Fig. 9 is a cross-sectional view showing only the first rotating member 1, the pressure plate 6, and the bolt 61. As shown in Fig. 9, each pillar portion 63 extends in the axial direction from the inner peripheral end portion of the second annular main body portion 62. In detail, the pillar portions 63 extend in the axial direction from the second annular main body portion 62 to the first rotating member 1. The pillar portions 63 are disposed at intervals from each other in the circumferential direction. A biasing member 51 is disposed between adjacent pillar portions 63.

[0087] The pillar portion 63 is fixed to the first rotating member 1. In detail, the pillar portion 63 has a screw hole 631 extending in the axial direction. The screw hole 631 opens toward the first rotating member 1. The bolt 61 is screwed into this screw hole 631. As a result, the bolt 61 fastens the first rotating member 1 and the pressure-receiving plate 6 together, and the first rotating member 1 and the pressure-receiving plate 6 are fixed to each other.

[0088] The abutment surface 113 of the first rotating member 1 abuts against this column portion 63. The abutment surface 113 abuts against the column portion 63 while facing radially inward. In detail, the column portion 63 has a recess 632 at its tip. The recess 632 faces radially outward. The protrusion 114 is housed within this recess 632. The column portion 63 is disposed radially inside the third cylindrical portion 53.

[0089] As shown in FIG. 3, the centrifugal element 7 is configured to rotate integrally with the first rotating member 1. More specifically, the centrifugal element 7 is a cylindrical roller. The centrifugal element 7 is disposed in the housing portion 111 of the first rotating member. The centrifugal element 7 is movable in the radial direction within the housing portion 111. The centrifugal element 7 is also movable in the axial direction within the housing portion 111. The outer peripheral surface of the centrifugal element 7 abuts against a cam surface 112. The centrifugal element 7 moves on the cam surface 112.

[0090] When the centrifugal element 7 rotates together with the first rotating member 1 and receives centrifugal force, it presses the pressure plate 5 in the axial direction toward the clutch portion 4. When the rotation speed of the first rotating member 1 becomes greater than a predetermined value, the centrifugal element 7 presses the pressure plate 5 so that the centrifugal clutch device 100 is in a clutch-on state.

[0091] In detail, when the centrifugal element 7 rotates together with the first rotating member 1, it moves radially outward due to centrifugal force, and also moves in the axial direction due to the cam surface 112. The centrifugal element 7 moves in the axial direction so as to press the pressure plate 5 toward the clutch unit 4. In this embodiment, the centrifugal element 7 presses the pressure plate 5 via the intermediate plate 71. The intermediate plate 71 rotates integrally with the first rotating member 1. The intermediate plate 71 is attached to the first rotating member 1 so as to be axially movable.

[0092] The cam mechanism 8 is configured to assist the pressing of the centrifugal element 7 against the clutch portion 4. When the pressure plate 5 rotates relative to the first rotating member 1 in the forward rotation direction, the cam mechanism 8 is configured to move the pressure plate 5 axially toward the clutch portion 4.

[0093] 10, the cam mechanism 8 has a first assist cam surface 81 and a second assist cam surface 82. The first assist cam surface 81 is formed on the first rotating member 1. The first assist cam surface 81 faces in the reverse rotation direction and is inclined so as to face the pressure plate 5.

[0094] The second assist cam surface 82 is formed on the pressure plate 5. The second assist cam surface 82 faces the forward rotation direction and is inclined so as to face the first rotating member 1. The second assist cam surface 82 faces the first assist cam surface 81. When the centrifugal element 7 presses the pressure plate 5 in the axial direction and torque in the forward rotation direction is transmitted from the second rotating member 2 to the pressure plate 5 via the clutch portion 4, the pressure plate 5 rotates in the forward rotation direction relative to the first rotating member 1. As a result, the second assist cam surface 82 presses the first assist cam surface 81 in the axial direction, and the pressure plate 5 moves in the axial direction away from the first rotating member 1 and presses the clutch portion 4 in the axial direction.

[0095] 1, the drive unit 101 has a drive shaft 107, a fifth gear 108, and a sixth gear 109. The fifth gear 108 is attached to the second shaft 106. The fifth gear 108 rotates integrally with the second shaft 106.

[0096] Torque is transmitted to the drive shaft 107 from the second shaft 106. The sixth gear 109 is attached to the drive shaft 107. The sixth gear 109 rotates integrally with the drive shaft 107. The sixth gear 109 meshes with the fifth gear 108. The driving wheel 102 is attached to the drive shaft 107.

[0097] <Operation> When the vehicle is driven forward in the drive unit 101 configured as above, the electric motor 103 rotates in a forward rotation direction. First, when the vehicle speed is low, the torque output by the electric motor 103 is transmitted from the first shaft 105 to the second shaft 106 via the first gear train 10. Here, when the vehicle speed is low, the rotation speed of the first rotating member 1 of the centrifugal clutch device 100 is equal to or lower than a predetermined value, so that the centrifugal clutch device 100 is in a clutch-off state and the second gear train 20 does not transmit torque. In addition, since the rotation speed of the fourth gear 20b is higher than that of the second shaft 106, the one-way clutch 3 rotates the outer ring 32 relative to the inner ring 31 in the forward rotation direction, and does not transmit torque from the second shaft 106 to the fourth gear 20b.

[0098] When the vehicle speed increases, the rotation speed of the first rotating member 1 of the centrifugal clutch device 100 exceeds a predetermined value, and the centrifugal clutch device 100 enters a clutch-on state. In detail, the pressing force of the centrifugal element 7 and the assisting force of the cam mechanism 8 press the clutch portion 4 sufficiently, so that the first clutch disk 41 and the second clutch disk 42 rotate integrally, and the clutch portion 4 is connected. As a result, torque is transmitted from the second rotating member 2 to the first rotating member 1 via the clutch portion 4. As a result, the torque output from the electric motor 103 to the first shaft 105 is transmitted to the second shaft 106 via the second gear train 20. The second shaft 106 has a higher rotation speed than the second gear 10b. Therefore, the first clutch 10c is disengaged and does not transmit torque between the second gear 10b and the second shaft 106 because the inner ring 10d rotates relative to the outer ring 10e in the forward rotation direction.

[0099] When the electric motor 103 stops and decelerates, the second shaft 106 rotates faster than the fourth gear 20b, so that the inner wheel 31 rotates relative to the outer wheel 32 in the forward rotation direction, and the one-way clutch 3 enters an engaged state. Therefore, the torque transmitted from the drive wheels 102 to the second shaft 106 is transmitted to the first shaft 105 via the one-way clutch 3, rotating the electric motor 103. As a result, regenerative braking can be activated.

[0100] Next, when the vehicle is to be driven in reverse, the electric motor 103 rotates in the reverse rotation direction. The torque output by the electric motor 103 is transmitted from the first shaft 105 to the second shaft 106 via the second gear train 20. In detail, the one-way clutch 3 is engaged because the outer wheel 32 rotates relative to the inner wheel 31 in the reverse rotation direction. Therefore, the torque in the reverse rotation direction is transmitted to the second shaft 106 via the one-way clutch 3. Note that the first clutch 10c does not transmit the torque in the reverse rotation direction.

[0101] [Variations] Although the embodiment of the present invention has been described above, the present invention is not limited to these, and various modifications are possible without departing from the spirit of the present invention. Note that the following modifications can basically be applied simultaneously.

[0102] (a) As shown in FIG. 11, the centrifugal clutch device 100 may be attached to a first shaft 105. In this case, the first rotating member 1 is attached to the first shaft 105. The second rotating member 2 is configured to rotate integrally with a third gear 20a. The third gear 20a is attached to the first shaft 105 via a one-way clutch 3. The fourth gear 20b is attached so as to rotate integrally with the second shaft 106.

[0103] The one-way clutch 3 is attached to the first shaft 105. The one-way clutch 3 is configured to transmit torque in the forward rotation direction from the second rotating member 2 to the first shaft 105. The one-way clutch 3 does not transmit torque in the forward rotation direction from the first shaft 105 to the second rotating member 2.

[0104] 12, when the inner ring 31 rotates relative to the outer ring 32 in the forward rotation direction, the rollers 33 are disengaged from the inner ring 31 and the outer ring 32 and do not transmit torque between the inner ring 31 and the outer ring 32. In other words, torque in the forward rotation direction is not transmitted from the inner ring 31 to the outer ring 32.

[0105] 13, when the outer ring 32 rotates relative to the inner ring 31 in the forward rotation direction, the rollers 33 mesh with each other between the inner ring 31 and the outer ring 32, transmitting torque between the inner ring 31 and the outer ring 32. That is, torque in the forward rotation direction is transmitted from the outer ring 32 to the inner ring 31.

[0106] In this way, when rotating in the forward rotation direction, the one-way clutch 3 transmits torque from the second rotating member 2 to the first shaft 105, but does not transmit torque from the first shaft 105 to the second rotating member 2.

[0107] 14, the first assist cam surface 81 faces in the forward rotation direction and is inclined to face the pressure plate 5. The second assist cam surface 82 faces in the reverse rotation direction and is inclined to face the first rotating member 1.

[0108] (b) In the above embodiment, the first rotating member 1 of the centrifugal clutch device 100 is attached to a member on the drive source side, and the second rotating member 2 is attached to a member on the drive source side, but the configuration of the centrifugal clutch device 100 is not limited to this. For example, the first rotating member 1 may be attached to a member on the drive source side, and the second rotating member 2 may be attached to a member on the drive wheel side.

[0109] (c) In the above embodiment, the drive unit 101 has the electric motor 103 as a drive source, but may have an internal combustion engine as a drive source. In other words, the centrifugal clutch device 100 may be configured to transmit torque output by an internal combustion engine.

[0110] (d) In the upper region embodiment, the centrifugal element 7 is configured as a roller that moves on the cam surface 112, but the configuration of the centrifugal element 7 is not limited to this. For example, as shown in FIG. 15, the centrifugal element 7 may be configured to swing around a swing axis. In detail, the centrifugal element 7 is attached to the first rotating member 1 via a swing pin 72. The centrifugal element 7 has a weight portion 73 and a pressing portion 74. When the centrifugal element 7 receives centrifugal force, it rotates clockwise in FIG. 15 around the swing pin 72. In detail, the weight portion 73 receives centrifugal force and moves radially outward, and as a result, the pressing portion 74 moves so as to press the pressure plate 5 toward the clutch portion 4. [Explanation of symbols]

[0111] 1: First rotating member 11: Main body 110: Opening 112: Cam surface 12: Press-fit section 120: Spline hole 121: Serration section 122: Tapered section 123: Middle section 124: Groove 2: Second rotating member 22: Boss Section 3: One-way clutch 4: Clutch section 5: Pressure plate 7: Centrifugal element 8: Cam mechanism 100: Centrifugal clutch device

Claims

1. A first rotating member; A centrifugal element configured to rotate integrally with the first rotating member; A second rotating member arranged to be rotatable relative to the first rotating member; Equipped with The first rotating member is a body portion including a central opening; a spline hole and a press-fitting portion including a serration portion press-fitted into an opening of the main body; having Centrifugal clutch device.

2. The press-fit portion is a tapered portion having an outer diameter that decreases with increasing distance from the serration portion; an intermediate portion having a constant outer diameter and disposed between the serration portion and the tapered portion in the axial direction; having 2. The centrifugal clutch device according to claim 1.

3. The press-fit portion has a groove portion extending in a circumferential direction between the serration portion and the intermediate portion.

3. The centrifugal clutch device according to claim 2.

4. the press-fit portion protrudes into a space defined by the first rotating member and the second rotating member, The groove is disposed within the space.

4. The centrifugal clutch device according to claim 3.

5. It also has a one-way clutch. The second rotating member has a boss portion extending in an axial direction, the one-way clutch is disposed radially inward relative to the boss portion, The press-fit portion is disposed at a distance from the one-way clutch in the axial direction.

5. The centrifugal clutch device according to claim 4.

6. The press-fit portion is disposed radially inward with respect to the boss portion.

6. The centrifugal clutch device according to claim 5.

7. a clutch unit configured to interruptably transmit torque between the first rotating member and the second rotating member; a pressure plate arranged to be rotatable relative to the first rotating member and to be movable in an axial direction, and configured to press the clutch portion; The centrifugal element is configured to receive centrifugal force and press the pressure plate toward the clutch portion.

2. The centrifugal clutch device according to claim 1.

8. a cam mechanism configured to move the pressure plate toward the clutch portion when the pressure plate rotates relative to the first rotating member in a forward rotation direction.

8. The centrifugal clutch device according to claim 7.

9. The main body portion has a cam surface that is inclined radially outwardly so as to approach the pressure plate, The main body has an outer circumferential portion where the cam surface is formed, and the thickness of the main body increases toward the radially outer side.

8. The centrifugal clutch device according to claim 7.

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