JP6553466B2 - Pulley device - Google Patents

Description

  The present invention relates to a pulley apparatus.

  A belt type continuously variable transmission is adopted in a scooter type motorcycle etc. (for example, patent document 1). This continuously variable transmission includes a drive pulley device, a driven pulley device, and a belt. The belt is suspended between the drive pulley device and the driven pulley device.

  The drive pulley apparatus and the driven pulley apparatus have a fixed sheave, a movable sheave, a boss for the fixed sheave, and a boss for the movable sheave. The belt is clamped by the fixed sheave and the movable sheave. The movable sheave boss is fixed to the movable sheave, and the fixed sheave boss is fixed to the fixed sheave. The movable sheave boss slides over the fixed sheave boss such that the movable sheave approaches and separates from the fixed sheave.

Patent No. 3651628 gazette

  In the pulley apparatus, it is preferable that the movable sheave boss which slides on the fixed sheave boss operate stably. Therefore, an object of the present invention is to make the sliding member operate stably.

  The pulley apparatus according to the first aspect of the present invention is a pulley apparatus for a continuously variable transmission. The pulley device includes a shaft member, a sliding member, a first dust seal, and a second dust seal. The sliding member is cylindrical and is disposed on the radially outer side of the shaft member. Further, the sliding member can slide on the shaft member without using grease. The first dust seal is provided at one end of the sliding member. The second dust seal is provided at the other end of the sliding member. The first and second dust seals seal between the sliding member and the shaft member.

  According to this configuration, since the first and second dust seals are provided at both ends of the sliding member, it is possible to prevent foreign matter from entering between the sliding member and the shaft member. As a result, the sliding member can operate stably.

  Preferably, the sliding member has a main body portion and a resin portion. The resin portion defines the inner circumferential surface of the sliding member. Also, the resin portion has a lower coefficient of friction than the main portion. According to this configuration, the sliding member can slide smoothly on the shaft member.

  At least one of the first and second dust seals may be a fiber composite

  At least one of the first and second dust seals may include an annular member disposed on the shaft member and an elastic body that biases the annular member toward the shaft member. The annular member has a lower coefficient of friction than the elastic body. According to this configuration, since the elastic body biases the annular member toward the shaft member, the annular member can be reliably in contact with the shaft member. In addition, the annular member has a lower coefficient of friction than the elastic body, and therefore can slide smoothly.

  The pulley apparatus according to the second aspect of the present invention includes a fixed sheave boss, a movable sheave boss, a first dust seal, and a second dust seal. The movable sheave boss has a cylindrical shape and is arranged on the radially outer side of the fixed sheave boss. The movable sheave boss slides on the fixed sheave boss without grease. The first dust seal is provided at one end of the movable sheave boss. The second dust seal is provided at the other end of the movable sheave boss. The first and second dust seals seal between the movable sheave boss and the fixed sheave boss.

  According to this configuration, since the first and second dust seals are provided at both ends of the movable sheave boss, foreign matter can be prevented from entering between the movable sheave boss and the fixed sheave boss. . As a result, the movable sheave boss can slide smoothly on the fixed sheave boss.

  According to the present invention, the sliding member can operate stably.

Side surface sectional drawing of a pulley apparatus. Side surface sectional drawing which shows the detail of the boss | hub for movable sheaves. Sectional drawing of a dust seal. The top view of a dust seal. Sectional drawing of the dust seal which concerns on a modification.

  Hereinafter, embodiments of a pulley apparatus according to the present invention will be described with reference to the drawings. The pulley device 100 according to the present embodiment is a driven-side pulley device 100. Torque is transmitted to the driven pulley device 100 from the driving pulley device (not shown) via the belt 101. The belt 101 is a member for transmitting torque.

  FIG. 1 is a side sectional view of a pulley apparatus 100. FIG. In the following description, the rotation axis O means the rotation axis of the pulley device 100. The radial direction means the radial direction of a circle centered on the rotation axis O. The radially outer side means the side away from the rotation axis O in the radial direction, and the radially inner side means the side approaching the rotation axis O in the radial direction. The axial direction means a direction along the rotation axis O. The first side in the axial direction means the left side of FIG. 1, and the second side in the axial direction means the right side of FIG. The circumferential direction means the circumferential direction of a circle centered on the rotation axis O.

  As shown in FIG. 1, the pulley apparatus 100 includes a fixed sheave 1, a movable sheave 2, a fixed sheave boss 3, a movable sheave boss 4, a first dust seal 5a, and a second dust seal 5b. There is. The pulley device 100 further includes an urging member 6 and a centrifugal clutch 7. The fixed sheave boss 3 corresponds to the shaft member of the present invention, and the movable sheave boss 4 corresponds to the sliding member of the present invention.

  The stationary sheave 1 is arranged to rotate around the rotation axis O. The central axis of the fixed sheave 1 is disposed substantially coaxially with the rotation axis O. The fixed sheave 1 is disposed on the second side of the movable sheave 2 in the axial direction. The stationary sheave 1 is fixed so as not to move in the axial direction.

  The stationary sheave 1 has a disk shape. The facing surface 11 of the fixed sheave 1 is inclined so as to move away from the movable sheave 2 as it goes outward in the radial direction. That is, the opposing surface 11 is inclined toward the second side in the axial direction toward the outer side in the radial direction. Note that the facing surface 11 of the fixed sheave 1 is a surface facing the movable sheave 2. That is, the facing surface 11 of the fixed sheave 1 faces the first side in the axial direction.

  The stationary sheave boss 3 rotates integrally with the stationary sheave 1. In the present embodiment, the fixed sheave boss 3 and the fixed sheave 1 are formed of a single member. The fixed sheave boss 3 and the fixed sheave 1 are respectively formed by separate members, and may be integrally rotated by being fixed to each other. The stationary sheave boss 3 is cylindrical and extends in the axial direction. The central axis of the fixed sheave boss 3 is arranged substantially coaxially with the rotation axis O.

  The centrifugal clutch 7 is attached to the first end 31 of the fixed sheave boss 3. Further, the fixed sheave 1 extends radially outward from the second end 32 of the fixed sheave boss 3. The first end 31 is an end on the first side in the axial direction, and the second end 32 is an end on the second side in the axial direction. The first end portion 31 has mounting surfaces extending in parallel with one another on the outer peripheral surface. Since the first end 31 has a smaller outer diameter than the other portions, the shoulder 33 is formed.

  An output shaft (not shown) extends in the axial direction inside the fixed sheave boss 3. The output shaft is, for example, an shaft for transmitting torque to the rear wheels. The output shaft and the fixed sheave boss 3 rotate relative to each other. The bearings 102 and 103 are disposed between the output shaft and the fixed sheave boss 3.

  The movable sheave 2 is arranged to rotate around the rotation axis O. The central axis of the movable sheave 2 is disposed substantially coaxially with the rotation axis O. The movable sheave 2 is arranged to move along the rotation axis O. That is, the movable sheave 2 is arranged to move in the axial direction. The movable sheave 2 moves toward and away from the fixed sheave 1 by moving in the axial direction. The movable sheave 2 is disposed on the first side of the fixed sheave 1 in the axial direction.

  The movable sheave 2 has a disk shape. The opposing surface 21 of the movable sheave 2 is inclined away from the fixed sheave 1 as it goes radially outward. That is, the opposing surface 21 is inclined toward the first side in the axial direction toward the outer side in the radial direction.

  The facing surface 21 of the movable sheave 2 is a surface facing the fixed sheave 1. That is, the facing surface 21 of the movable sheave 2 faces the second side in the axial direction. The opposing surface 11 of the fixed sheave 1 and the opposing surface 21 of the movable sheave 2 are opposed at an interval. A V groove is formed by the facing surface 11 of the fixed sheave 1 and the facing surface 21 of the movable sheave 2. By moving the movable sheave 2 in the axial direction, the groove width of the V groove changes. The belt 101 is disposed in the V-shaped groove. The belt 101 is held between the facing surface 11 of the fixed sheave 1 and the facing surface 21 of the movable sheave 2.

  The movable sheave boss 4 rotates integrally with the movable sheave 2 and moves in the axial direction. In the present embodiment, the movable sheave boss 4 and the movable sheave 2 are formed of a single member. The movable sheave boss 4 and the movable sheave 2 are formed by separate members, and may be integrally rotated and moved in the axial direction by being fixed to each other.

  The movable sheave boss 4 is cylindrical and extends in the axial direction. The central axis of the movable sheave boss 4 is arranged substantially coaxially with the rotation axis O. The movable sheave boss 4 is disposed radially outside the fixed sheave boss 3. The movable sheave boss 4 can slide on the fixed sheave boss 3 without any grease. The inner peripheral surface of the movable sheave boss 4 is in contact with the outer peripheral surface of the fixed sheave boss 3.

  Specifically, the movable sheave boss 4 has a boss main body (an example of a main body portion) 41 and a sliding portion 42. The boss main body 41 has a cylindrical shape. The boss main body 41 is made of metal, for example. Specifically, the boss main body 41 is made of steel or an aluminum alloy. More specifically, the boss main body 41 is formed of at least one selected from the group consisting of carbon steel and alloy steel. The sliding portion 42 is attached to the inner peripheral surface of the boss main body 41. That is, the sliding portion 42 defines the inner peripheral surface of the movable sheave boss 4. Note that a metal layer, a sintered body layer, or the like may be interposed between the boss body 41 and the sliding portion 42. The sliding portion 42 has a cylindrical shape, and the inner circumferential surface of the sliding portion 42 is in contact with the outer circumferential surface of the stationary sheave boss 3. The friction coefficient of the sliding part 42 is smaller than the friction coefficient of the boss body 41. For example, the sliding portion 42 is formed of resin. More specifically, the sliding portion 42 is formed of at least one selected from the group consisting of nylon resin, fluororesin, polyetheretherketone resin, and polyphenylene sulfide resin. Thus, since the sliding part 42 has a smaller coefficient of friction than the boss body 41, it can slide smoothly on the fixed sheave boss 3.

  As shown in FIG. 2, a retaining ring 81 is provided on the inner peripheral surface of the boss main body 41. The snap ring 81 can restrict movement of the sliding portion 42 in the second axial direction. The movable sheave boss 4 has a third end 43 and a fourth end 44. The third end portion 43 is an end portion on the first side in the axial direction, and the fourth end portion 44 is an end portion on the second side in the axial direction. An annular groove 45 extending in the circumferential direction is formed on the inner peripheral surface of the third end portion 43. An annular groove 46 extending in the circumferential direction is also formed on the inner peripheral surface of the fourth end portion 44. The movable sheave 2 extends radially outward from the fourth end 44 of the movable sheave boss 4.

  The first dust seal 5 a is provided at the third end 43 of the movable sheave boss 4 and seals between the movable sheave boss 4 and the fixed sheave boss 3. The first dust seal 5 a is attached to, for example, an annular groove 45 formed in the third end 43. The first dust seal 5a protrudes radially inward from the annular groove 45. The first dust seal 5 a is in contact with the outer peripheral surface of the fixed sheave boss 3. As shown in FIG.3 and FIG.4, the 1st dust seal 5a is cyclic | annular. Moreover, the cross-sectional shape of the 1st dust seal 5a is a rectangular shape. The first dust seal 5a is, for example, a fiber composite. In detail, the first dust seal 5a is configured by fusing resin fibers with a rubber elastic body.

  As shown in FIG. 2, the second dust seal 5 b is provided at the fourth end 44 of the movable sheave boss 4, and seals between the movable sheave boss 4 and the fixed sheave boss 3. The second dust seal 5 b is attached to, for example, an annular groove 46 formed in the fourth end 44. Note that the second dust seal 5 b protrudes radially inward from the annular groove 46. The second dust seal 5 b is in contact with the outer peripheral surface of the stationary sheave boss 3. The second dust seal 5b has the same configuration as the first dust seal 5a, and thus the detailed description will be omitted.

  As shown in FIG. 1, the biasing member 6 biases the movable sheave 2 toward the fixed sheave 1 in the axial direction. That is, the urging member 6 urges the movable sheave 2 toward the second side in the axial direction. As a result, the fixed sheave 1 and the movable sheave 2 sandwich the belt 101. The biasing member 6 can be, for example, a spring member such as a coil spring.

  The centrifugal clutch 7 has a drive plate 71, a plurality of clutch shoes 72, and a clutch housing 73. The centrifugal clutch 7 is configured to transmit or block the rotation of the fixed sheave 1 and the movable sheave 2 to the output shaft. In detail, the centrifugal clutch 7 is configured to transmit and interrupt the rotation of the fixed sheave boss 3 to the output shaft.

  The drive plate 71 is attached to the first end 31 of the fixed sheave boss 3. The drive plate 71 rotates integrally with the stationary sheave boss 3. In detail, the drive plate 71 is a disk-like plate having a through hole 711 at the center. The through hole 711 is shaped to engage with the first end 31 of the fixed sheave boss 3. Specifically, the outer peripheral edge of the through hole 711 has substantially the same shape as the outer peripheral edge of the stationary sheave boss 3. The drive plate 71 is restricted from moving to the second side in the axial direction by contacting the shoulder 33 of the fixed sheave boss 3. The drive plate 71 is restricted from moving toward the first side in the axial direction by the retaining ring 80 attached to the first end portion 31.

  Each clutch shoe 72 has a circumferential end attached to the drive plate 71 so as to be swingable. Each clutch shoe 72 has a friction material 74 on its outer peripheral surface. A return spring (not shown) is attached to the other end of each clutch shoe 72 so as to bias each clutch shoe 72 radially inward.

  The clutch housing 73 is disposed so as to cover each clutch shoe 72 from the outside in the radial direction. The clutch housing 73 is relatively rotatably supported by the stationary sheave boss 3. Specifically, the clutch housing 73 has a boss 731. Spline holes 7311 are formed in the boss portion 731. An output shaft can be spline engaged with the spline hole 7311.

  When the centrifugal clutch 7 is in the transmission state, the friction material 74 of each clutch shoe 72 is frictionally engaged with the inner peripheral surface of the clutch housing 73. Further, when the centrifugal clutch 7 is in the disconnected state, the friction material 74 of each clutch shoe 72 is separated from the inner peripheral surface of the clutch housing 73. The transmission state of the centrifugal clutch 7 means that the centrifugal clutch 7 transmits the rotation of the fixed sheave 1 and the movable sheave 2 to the output shaft. Further, the disengagement state of the centrifugal clutch 7 means a state in which the centrifugal clutch 7 does not transmit the rotation of the fixed sheave 1 and the movable sheave 2 to the output shaft.

  The pulley apparatus configured as described above operates as follows.

  In the pulley apparatus on the drive side, when the width of the groove formed by the fixed sheave and the movable sheave is narrowed, the winding diameter of the belt 101 is increased. That is, the belt 101 moves radially outward in the driving pulley apparatus.

  In the pulley apparatus 100 on the driven side, the width of the groove constituted by the fixed sheave 1 and the movable sheave 2 operates reverse to the groove width in the pulley apparatus on the drive side. That is, when the belt 101 moves outward in the radial direction in the drive-side pulley device, the belt 101 moves inward in the radial direction in the driven-side pulley device 100.

  When the belt 101 moves inward in the radial direction, the movable sheave 2 moves away from the fixed sheave 1 against the biasing force of the biasing member 6. That is, the movable sheave 2 moves to the first side in the axial direction. As a result, the width of the groove between the fixed sheave 1 and the movable sheave 2 is increased.

  Further, in the pulley apparatus on the drive side, when the width of the groove constituted by the fixed sheave and the movable sheave is expanded, the winding diameter of the belt 101 is reduced. That is, the belt 101 moves radially inward in the pulley apparatus on the drive side.

  When the belt 101 moves inward in the radial direction in the drive-side pulley device, the belt 101 moves outward in the radial direction in the driven-side pulley device 100. Then, the movable sheave 2 moves in a direction approaching the fixed sheave 1 by the urging force of the urging member 6. As a result, the width of the groove between the fixed sheave 1 and the movable sheave 2 is reduced.

  As mentioned above, the pulley apparatus 100 which concerns on this embodiment has the following characteristics.

  Since the first and second dust seals 5a and 5b are provided at both ends 43 and 44 of the movable sheave boss 4, foreign matter is prevented from entering between the movable sheave boss 4 and the fixed sheave boss 3. be able to. As a result, the movable sheave boss 4 can slide smoothly on the fixed sheave boss 3.

[Modification]
As mentioned above, although embodiment of this invention was described, this invention is not limited to these, A various change is possible unless it deviates from the meaning of this invention.

Modification 1
As shown in FIG. 5, the first and second dust seals 5 a and 5 b may be configured to have an annular member 51 and an elastic body 52. The annular member 51 has a smaller friction coefficient than the elastic body 52. For example, the annular member 51 is made of resin. More specifically, the cyclic member 51 is formed of at least one selected from the group consisting of a nylon resin, a fluorocarbon resin, a polyetheretherketone resin, and a polyphenylene sulfide resin. The elastic body 52 biases the annular member 51 to the fixed sheave boss 3. In detail, the elastic body 52 is disposed between the annular member 51 and the movable sheave boss 4 in a compressed state. For this reason, the annular member 51 is biased to the fixed sheave boss 3 by the elastic force of the elastic body 52. For example, the elastic body 52 is formed of rubber such as natural rubber or synthetic rubber.

Modification 2
Although the present invention is applied to the driven pulley apparatus in the above embodiment, the present invention can also be applied to the drive pulley apparatus.

1: fixed sheave 2: movable sheave 3: fixed sheave boss 4: movable sheave boss 42: sliding portion 43: third end 44: fourth end 5a: first dust seal 5b: second dust seal 51: annular Member 52: Elastic body 100: Pulley device O: Rotating shaft O

Claims (3)

  Fixed sheaves,
  A stationary sheave boss extending axially from the stationary sheave to the first side;
  A movable sheave,
  A cylindrical movable sheave boss that extends from the movable sheave to the first axial side and is disposed radially outward of the fixed sheave boss and can slide on the fixed sheave boss without grease ,
  A first dust seal provided at an end portion on the first axial side of the movable sheave boss, and sealing between the movable sheave boss and the fixed sheave boss;
  A second dust seal provided at an end portion on the second axial side of the movable sheave boss and sealing between the movable sheave boss and the fixed sheave boss;
Equipped with
  The movable sheave boss has a boss body and a sliding portion that defines an inner peripheral surface of the movable sheave boss and has a lower friction coefficient than the boss body,
  The boss body has a stepped portion formed by making the inner diameter of the end portion on the first side in the axial direction smaller than the inner diameter of the other portion, and a retaining ring provided on the inner peripheral surface
  The sliding portion is disposed between the retaining ring and the step portion.
Pulley device.
At least one of the first and second dust seals is a fiber composite.
The pulley apparatus according to claim 1.
At least one of the first and second dust seals includes an annular member disposed on the stationary sheave boss, and an elastic body urging the annular member toward the stationary sheave boss .
The annular member has a lower coefficient of friction than the elastic body,
The pulley apparatus according to claim 1 or 2.

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