Clutch shoe and centrifugal clutch device

Abstract

To suppress cost variation.SOLUTION: A clutch shoe for a centrifugal clutch device includes a base member and a weight member. The base member has a through hole. The base member is made of a nonferrous material. The weight member is made of a material different from that of the base member. The weight member is attached to the base member.SELECTED DRAWING: Figure 3

Description

[Technical Field]

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

[0002] A centrifugal clutch device has a drive plate, clutch shoes, and a clutch outer (see, for example, Patent Document 1). The clutch shoes are attached to the drive plate so as to be able to swing relative to the drive plate and are configured to rotate integrally with the drive plate. When the drive plate rotates, the clutch shoes swing radially outward due to centrifugal force. As a result, the clutch shoes frictionally engage with the clutch outer, and torque is transmitted to the clutch outer. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2019-124361 Summary of the Invention [Problem to be solved by the invention]

[0004] Clutch shoes are generally made by zinc die casting, but the price of zinc fluctuates greatly, which causes a problem of large fluctuations in the cost of clutch shoes.

[0005] An object of the present invention is to provide a clutch shoe that can suppress cost fluctuations. [Means for solving the problem]

[0006] A clutch shoe according to a first aspect is a clutch shoe for a centrifugal clutch device. The clutch shoe includes a base member and a weight member. The base member has a through hole. The base member is made of a non-ferrous material. The weight member is made of a different material from the base member. The weight member is attached to the base member.

[0007] According to this configuration, the base member and the weight member are made of different materials. Therefore, even if the base member must be made of a material with large cost fluctuations (such as zinc), the weight member can be made of a material with small cost fluctuations. In this way, the weight member can be made of a material with small cost fluctuations, which helps to reduce cost fluctuations in the clutch shoe.

[0008] When attaching the clutch shoe to the input member, an iron or steel pin extending from the input member is inserted into a through-hole in the base member. Here, since the base member in which the through-hole is formed is made of a non-ferrous material, electrolytic corrosion between the pin and the base member can be suppressed. Note that the non-ferrous material refers to a material other than iron or steel.

[0009] The clutch shoe according to the second aspect is the clutch shoe according to the first aspect, and is configured as follows: The base member is configured from a non-ferrous metal, which means a metal other than iron or steel.

[0010] A clutch shoe according to a third aspect is the clutch shoe according to the first or second aspect, and is configured as follows: The base member is made of zinc, aluminum, copper, magnesium, or an alloy thereof.

[0011] A clutch shoe according to a fourth aspect is the clutch shoe according to any one of the first to third aspects, and is configured as follows: The weight member is made of iron or steel.

[0012] A clutch shoe according to a fifth aspect is the clutch shoe according to any one of the first to fourth aspects, further comprising a fastening member. The weight member has a first weight member and a second weight member. The first weight member is disposed on a first surface side of the base member. The second weight member is disposed on a second surface side of the base member facing opposite to the first surface. The fastening member fastens the first weight member, base member, and second weight member together.

[0013] A clutch shoe according to a sixth aspect is the clutch shoe according to the fifth aspect, and is configured as follows: The weight member has a plurality of second weight members. Each second weight member is plate-shaped. Each second weight member is stacked on the second surface of the base member.

[0014] A clutch shoe according to a seventh aspect is the clutch shoe according to any one of the first to sixth aspects, configured as follows: The base member has a support portion and a plate portion. The support portion includes a through hole. The plate portion extends from a side surface of the support portion. The weight member is disposed on the plate portion. The weight member faces the side surface of the support portion.

[0015] A centrifugal clutch device according to an eighth aspect includes an input member, a pin, a clutch shoe according to any one of the first to seventh aspects, and a clutch outer. The input member is rotatably arranged. The pin extends axially from the input member. The pin is made of iron or steel. The clutch shoe is attached to the input member via the pin so as to be able to swing. The clutch outer is arranged so as to be able to rotate relative to the input member. The clutch outer is arranged radially outward from the clutch shoe. The pin extends within a through hole in a base member. [Effects of the Invention]

[0016] According to the present invention, cost fluctuations can be suppressed. [Brief explanation of the drawings]

[0017] [Figure 1] FIG. [Figure 2] FIG. [Figure 3] FIG. [Figure 4] FIG. [Figure 5] FIG. [Figure 6] FIG. DETAILED DESCRIPTION OF THE INVENTION

[0018] The clutch shoe 103 and centrifugal clutch device 100 according to this embodiment will be described below with reference to the drawings. In the following description, the axial direction refers to the direction in which the rotation axis O of the centrifugal clutch device 100 extends. The circumferential direction refers to the circumferential direction of a circle centered on the rotation axis O, and the radial direction refers to the radial direction of a circle centered on the rotation axis O.

[0019] [Centrifugal clutch device] Fig. 1 is a cross-sectional view of a centrifugal clutch device 100 to which a pulley device 200 is attached, and Fig. 2 is a front view of the centrifugal clutch device 100. As shown in Fig. 1, the centrifugal clutch device 100 is configured to output torque transmitted from the pulley device 200 to a driving wheel (not shown) or the like. The centrifugal clutch device 100 is a dry clutch.

[0020] 1 and 2, the centrifugal clutch device 100 has a drive plate 101 (an example of an input member), a plurality of pins 102, a plurality of clutch shoes 103, a clutch outer 104, a plurality of springs 105, and a plurality of friction materials 106. In this embodiment, the centrifugal clutch device 100 has three pins 102, three clutch shoes 103, and three springs 105.

[0021] The drive plate 101 is disposed so as to be rotatable around a rotation axis O. The drive plate 101 is attached to a fixed boss 201 of the pulley device 200. The drive plate 101 rotates integrally with the fixed boss 201.

[0022] The pins 102 extend in the axial direction from the drive plate 101. The pins 102 are arranged at intervals in the circumferential direction. Each pin 102 is cylindrical. Each pin 102 is made of iron or steel.

[0023] Each clutch shoe 103 is swingably attached to the drive plate 101. More specifically, each clutch shoe 103 is swingably attached to the drive plate 101 via each pin 102. Each clutch shoe 103 swings radially outward due to centrifugal force.

[0024] Each clutch shoe 103 extends in the circumferential direction and is disposed along the outer periphery of the drive plate 101. The detailed structure of each clutch shoe 103 will be described later.

[0025] Each spring 105 connects adjacent clutch shoes 103. Each clutch shoe 103 is biased radially inward by this spring 105. Therefore, when no centrifugal force is acting on each clutch shoe 103, each clutch shoe 103 is not in frictional engagement with the clutch outer 104.

[0026] The clutch outer 104 is arranged to be rotatable relative to the drive plate 101. The clutch outer 104 is arranged radially outward from each clutch shoe 103. In other words, the clutch outer 104 is arranged so as to surround each clutch shoe 103.

[0027] The clutch outer 104 is configured to be fixed to a member (not shown) on the drive wheel side. The clutch outer 104 has a disk portion 104a, a cylindrical portion 104b, and a boss portion 104c.

[0028] The disk portion 104a has an opening in the center. A boss portion 104c is fixed to the inner peripheral end of the disk portion 104a. The boss portion 104c is cylindrical. The boss portion 104c extends in the axial direction. A spline groove is formed on the inner peripheral surface of the boss portion 104c. A member on the drive wheel side is spline-fitted to the boss portion 104c.

[0029] The cylindrical portion 104b extends in the axial direction from the outer peripheral end of the disk portion 104a. Each clutch shoe 103 is disposed radially inside the cylindrical portion 104b. That is, the cylindrical portion 104b is disposed so as to surround each clutch shoe 103.

[0030] The friction material 106 is disposed between the inner peripheral surface of the cylindrical portion 104b of the clutch outer 104 and the outer peripheral surface of the clutch shoe 103. The friction material 106 is fixed to the outer peripheral surface of the clutch shoe 103. The friction material 106 is configured to frictionally engage with the inner peripheral surface of the cylindrical portion 104b of the clutch outer 104.

[0031] [Clutch shoe] Next, the clutch shoe 103 will be described in detail. Fig. 3 is a perspective view of the clutch shoe. In the following description, the thickness direction means the thickness direction of the clutch shoe 103, which is the same direction as the axial direction. As shown in Fig. 3, the clutch shoe 103 is a member for the centrifugal clutch device 100. The clutch shoe 103 has a base member 2, a plurality of weight members 3, and a plurality of fastening members 4.

[0032] 4 and 5 are perspective views of the base member 2. As shown in Fig. 4 and 5, the base member 2 has a support portion 21, a plate portion 22, and a wall portion 23. The support portion 21, the plate portion 22, and the wall portion 23 are integrally formed by a single member.

[0033] The base member 2 is made of a non-ferrous material. Specifically, the base member 2 is made of a non-ferrous metal. More specifically, the base member 2 is made of zinc, aluminum, copper, magnesium, or an alloy thereof. In this embodiment, the base member 2 is made of a zinc alloy. The base member 2 is formed by zinc die-casting.

[0034] The support column 21 has a first through hole 211 (an example of a through hole). The support column 21 extends in the thickness direction. The first through hole 211 penetrates the support column 21 in the thickness direction. The pin 102 is inserted into this first through hole 211. In the clutch shoe 103, only the support column 21 in which this first through hole 211 is formed comes into contact with the pin 102.

[0035] The plate portion 22 extends in the circumferential direction from the side surface of the support portion 21. The thickness of the plate portion 22 is smaller than the thickness of the support portion 21. Here, the thickness means the dimension in the thickness direction.

[0036] The plate portion 22 faces a first surface 221 and a second surface 222. The first surface 221 and the second surface 222 face opposite each other in the thickness direction. Specifically, the first surface 221 faces upward in Figures 4 and 5, and the second surface 222 faces downward in Figures 4 and 5.

[0037] The plate portion 22 has a plurality of second through holes 223 and third through holes 224. Each of the second through holes 223 and the third through holes 224 penetrates the plate portion 22 in the thickness direction. Each of the second through holes 223 is a hole for passing a fastening member 4 through. The third through hole 224 is a hole for attaching the spring 105.

[0038] The wall portion 23 extends in the thickness direction from the outer peripheral end of the plate portion 22. In detail, the wall portion 23 extends in the thickness direction from the first surface 221 of the plate portion 22 and also extends in the thickness direction from the second surface 222 of the plate portion 22.

[0039] Figure 6 is a perspective view of the clutch shoe as seen from the radially outer side. As shown in Figure 6, wall portion 23 forms the outer peripheral surface of clutch shoe 103. The outer peripheral surface of clutch shoe 103 refers to the surface of clutch shoe 103 facing radially outward.

[0040] The wall portions 23 are configured to cover the outer peripheral surface of each weight member 3. A friction material 106 is attached to the outer peripheral surface of the clutch shoe 103 formed by the wall portions 23 (see FIG. 2). That is, the friction material 106 is attached to the wall portions 23. Note that, as in this embodiment, a portion of the weight member 3 may be exposed on the outer peripheral surface of the clutch shoe 103. The friction material 106 is not attached to this exposed weight member 3. That is, the friction material 106 is attached only to the wall portions 23.

[0041] 3, each weight member 3 is attached to the base member 2. Each weight member 3 is stacked on the plate portion 22. In detail, each weight member 3 includes a first weight member 31 and a plurality of second weight members 32.

[0042] The first weight member 31 is disposed on the first surface 221 side of the plate portion 22. More specifically, the first weight member 31 is plate-shaped and is layered on the first surface 221 of the plate portion 22. That is, the first weight member 31 is layered in the thickness direction. Note that the first weight member 31 does not have to be layered directly on the first surface 221. That is, another member may be interposed between the first weight member 31 and the first surface 221. A portion of the first weight member 31 is exposed radially outward from the wall portion 23.

[0043] Each second weight member 32 is disposed on the second surface 222 side of the plate portion 22. Each second weight member 32 is plate-shaped and is layered on the second surface 222 of the plate portion 22. That is, each second weight member 32 is layered in the thickness direction. Note that the second weight members 32 do not have to be layered directly on the second surface 222. That is, another member may be interposed between the second weight members 32 and the second surface 222. Furthermore, another member may be interposed between each second weight member 32.

[0044] The first weight member 31 and each second weight member 32 face a side surface of the support pillar 21. The first weight member 31 and each second weight member 32 face the wall 23. In other words, the first weight member 31 and each second weight member 32 are housed in a space defined by the support pillar 21, the plate 22, and the wall 23.

[0045] The first weight member 31 and each second weight member 32 do not have a first through-hole 211 for inserting the pin 102. In other words, the first weight member 31 and each second weight member are configured not to come into contact with the pin 102.

[0046] The plate portion 22 is sandwiched in the thickness direction between the first weight member 31 and the second weight member 32. The fastening members 4 fasten the first weight member 31, the plate portion 22, and each second weight member 32 together. The fastening members 4 are, for example, rivets.

[0047] The combined thickness of the first weight member 31, each second weight member 32, and plate portion 22 is approximately the same as the thickness of the support portion 21. In particular, the combined thickness of the first weight member 31, each second weight member 32, and plate portion 22 is smaller than the thickness of the support portion 21.

[0048] The weight member 3 is made of a material different from that of the base member 2. The weight member 3 is made of, for example, iron or steel. Preferably, the weight member 3 is a steel plate.

[0049] [Operation] The centrifugal clutch device 100 configured as described above operates as follows.

[0050] First, the pulley device 200 rotates due to torque from the engine. The drive plate 101 rotates integrally with the fixed boss 201. As the drive plate 101 rotates, centrifugal force acts on the clutch shoe 103, causing the clutch shoe 103 to move radially outward against the biasing force of the spring 105. As a result, the friction material 106 attached to the outer periphery of the clutch shoe 103 frictionally engages with the clutch outer 104, causing the clutch outer 104 to rotate. As a result, the driving force from the engine is transmitted to the drive wheels.

[0051] [Variations] Although the embodiments of the present invention have 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.

[0052] (a) The friction material 106 may be attached to the inner circumferential surface of the cylindrical portion 104b of the clutch outer 104, instead of to the wall portion 23 of the clutch shoe 103. In this case, the clutch shoe 103 is frictionally engaged with the friction material 106. The friction material 106 extends continuously in the circumferential direction on the inner circumferential surface of the cylindrical portion 104b. In other words, the friction material 106 is annular and extends in the circumferential direction. When the clutch shoe 103 swings and moves in the radial direction, only the wall portion 23 comes into contact with the friction material 106. In other words, the weight member 3 is configured not to come into contact with the friction material 106.

[0053] (b) The weight member 3 may be laminated only on the first surface 221 of the plate portion 22, or may be laminated only on the second surface 222 of the plate portion 22.

[0054] (c) The friction material 106 may be attached to a part other than the wall portion 23. That is, the friction material 106 may be attached not only to the wall portion 23 of the base member 2 but also to the weight member 3. [Explanation of symbols]

[0055] 2: Base material 21: Strut part 211: First through hole 22: Plate section 221: 1st page 222: 2nd side 3: Weight member 31: First weight member 32: Second weight member 4: Fastening member 100: Centrifugal clutch device 101: Drive plate 102: Pin 103: Clutch shoe 104: Clutch outer

Claims

1. A clutch shoe for a centrifugal clutch device, comprising: a base member having a through hole and made of a non-ferrous material; a weight member made of a material different from that of the base member and attached to the base member; A clutch shoe.

2. The base member is made of a non-ferrous metal.

2. The clutch shoe according to claim 1.

3. The base member is made of zinc, aluminum, copper, magnesium, or an alloy thereof.

2. The clutch shoe according to claim 1.

4. The weight member is made of iron or steel.

2. The clutch shoe according to claim 1.

5. Further comprising a fastening member, The weight member is a first weight member disposed on a first surface side of the base member; a second weight member disposed on a second surface side of the base member facing the opposite side to the first surface; and the fastening member fastens the first weight member, the base member, and the second weight member together; 2. The clutch shoe according to claim 1.

6. the weight member has a plurality of the second weight members, Each of the second weight members has a plate shape and is stacked on the second surface of the base member.

6. The clutch shoe according to claim 5.

7. The base member is a support portion including the through hole; a plate portion extending from a side surface of the support portion; and The weight member is disposed on the plate portion and faces a side surface of the support portion.

2. The clutch shoe according to claim 1.

8. an input member rotatably disposed; a pin extending axially from the input member and constructed of iron or steel; the clutch shoe according to claim 1 being pivotally attached to the input member via the pin; a clutch outer disposed rotatably relative to the input member and radially outward from the clutch shoe; Equipped with The pin extends through the through hole of the base member. Centrifugal clutch device.

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