JP6668394B2 - Pulley device - Google Patents

Description

  The present invention relates to a pulley device.

  In scooter type motorcycles and the like, a belt-type continuously variable transmission is employed. In this continuously variable transmission, a pulley device is used. In the pulley device disclosed in Patent Document 1, when the drive plate is attached to the fixed boss, the drive plate and the fixed boss are aligned with each other, and the cam receiving portion of the drive plate and the cam of the fixed boss are aligned. Need to be aligned.

JP-A-2017-161026

  Since the above-described operation of mounting the drive plate needs to be performed while compressing a spring for urging the movable sheave, there is a problem that the mounting operation becomes difficult. Therefore, an object of the present invention is to provide a pulley device to which a drive plate can be more easily attached.

  A pulley device according to an aspect of the present invention includes a fixed sheave, a fixed boss, a movable sheave, a movable boss, a cam, a cam receiving member, a drive plate, and a spring. The fixed boss extends axially from the fixed sheave. The movable sheave is axially movable to move toward and away from the fixed sheave. The movable boss extends axially from the movable sheave. The cam portion rotates integrally with the movable boss. The cam receiving member has a first through hole that engages with the fixed boss. The drive plate has a second through hole that engages with the fixing boss. The spring is arranged in a compressed state between the drive plate and the movable sheave. The cam portion and the cam receiving member are configured to convert a relative rotation of each other into an axial thrust.

  According to this configuration, the drive plate and the cam receiving member are separately mounted on the fixed boss. When the drive plate is mounted on the fixed boss, there is no need to align the drive plate with the cam, and it is only necessary to align the drive plate with the fixed boss. it can.

  Preferably, the pulley device further includes a tubular spring seat disposed between the spring and the movable boss.

  Preferably, the cam receiving member has an annular holder having a first through hole, and a cam receiving portion attached to the holder.

  Preferably, the holder portion and the cam receiving portion are formed of mutually different materials. According to this configuration, the holder portion requiring strength and the cam receiving portion requiring slidability can be formed of materials suitable for each.

  Preferably, the holder part has a mounting part projecting in the radial direction. Then, the cam receiving portion is sandwiched between the mounting portion and the drive plate.

  Preferably, the cam portion is configured as a part of the movable boss.

  Preferably, the cam receiving member has a pair of first flat surfaces on an inner peripheral surface that defines the first through hole. The drive plate has a pair of second flat surfaces on an inner peripheral surface that defines the second through hole. The fixed boss has a pair of third flat surfaces facing the pair of first flat surfaces and the pair of second flat surfaces on the outer peripheral surface.

  According to the present invention, the drive plate can be more easily attached.

FIG. 3 is a side sectional view of the pulley device. The figure which looked at the fixed sheave and the fixed boss | hub from the 1st side of the axial direction. FIG. 2 is an exploded view of the pulley device. The figure which looked at the cam receiving member from the 2nd side of the axial direction. The side view which shows a cam mechanism. The figure which looked at the drive plate from the 2nd side of the axial direction.

  Hereinafter, an embodiment of a pulley device 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 pulley device 100. Torque is transmitted to the driven pulley device 100 via a belt 101 from a driving pulley device (not shown). The belt 101 is a member for transmitting torque.

  FIG. 1 is a side sectional view of the pulley device 100. 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 term “radially outside” means a side away from the rotation axis O in the radial direction, and the term “radially inside” means a 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 in FIG. 1, and the second side in the axial direction means the right side in FIG. The circumferential direction refers to the circumferential direction of a circle around the rotation axis O.

[Pulley device]
As shown in FIG. 1, the pulley device 100 includes a fixed sheave 1, a fixed boss 2, a movable sheave 3, a movable boss 4, a cam portion 5, a cam receiving member 6, a drive plate 7, and a spring 8. The pulley device 100 also includes a spring seat 9, a sliding member 41, a first dust seal 42a, a second dust seal 42b, and the like.

[Fixed sheave]
The fixed sheave 1 is arranged so as to rotate about a 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 arranged on the second side of the movable sheave 3 in the axial direction. The fixed sheave 1 is fixed so as not to move in the axial direction.

  The fixed 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 3 as going outward in the radial direction. That is, the facing surface 11 is inclined toward the second side in the axial direction toward the outside in the radial direction. The facing surface 11 of the fixed sheave 1 is a surface facing the movable sheave 3. That is, the facing surface 11 of the fixed sheave 1 faces the first side in the axial direction.

[Fixed boss]
The fixed boss 2 rotates integrally with the fixed sheave 1. In this embodiment, the fixed boss 2 and the fixed sheave 1 are formed by one member. Note that the fixed boss 2 and the fixed sheave 1 are respectively formed by separate members, and may be integrally rotated by being fixed to each other. The fixed boss 2 is cylindrical and extends from the fixed sheave 1 in the axial direction. Specifically, the fixed boss 2 extends from the fixed sheave 1 to the first side in the axial direction. The central axis of the fixed boss 2 is disposed substantially coaxially with the rotation axis O.

  The drive plate 7 is attached to the tip 21 of the fixed boss 2. The tip 21 of the fixed boss 2 is an end on the first side in the axial direction. Since the outer diameter of the distal end portion 21 is smaller than that of the other portions, a step portion 24 is formed.

  As shown in FIG. 2, the fixed boss 2 has a pair of third flat surfaces 23 on the outer peripheral surface of the distal end portion 21. The pair of third flat surfaces 23 extend in parallel with each other. The pair of third flat surfaces 23 oppose first and second flat surfaces described later.

  The output shaft (not shown) extends inside the fixed boss 2 in the axial direction. The output shaft is, for example, a shaft for transmitting torque to the rear wheels. The output shaft and the fixed boss 2 are relatively rotatable. Note that bearings 102 and 103 are arranged between the output shaft and the fixed boss 2.

[Movable sheave]
As shown in FIG. 1, the movable sheave 3 is arranged to rotate about a rotation axis O. The center axis of the movable sheave 3 is disposed substantially coaxially with the rotation axis O. The movable sheave 3 is arranged to move along the rotation axis O. That is, the movable sheave 3 is arranged so as to move in the axial direction. The movable sheave 3 moves toward and away from the fixed sheave 1 by moving in the axial direction. The movable sheave 3 is arranged on the first side of the fixed sheave 1 in the axial direction.

  The movable sheave 3 has a disk shape. The opposing surface 31 of the movable sheave 3 is inclined away from the fixed sheave 1 toward the outside in the radial direction. That is, the facing surface 31 is inclined toward the first side in the axial direction toward the outside in the radial direction.

  The facing surface 31 of the movable sheave 3 is a surface facing the fixed sheave 1. That is, the opposing surface 31 of the movable sheave 3 faces the second side in the axial direction. The opposing surface 11 of the fixed sheave 1 and the opposing surface 31 of the movable sheave 3 oppose each other at an interval. The opposing surface 11 of the fixed sheave 1 and the opposing surface 31 of the movable sheave 3 form a V groove. As the movable sheave 3 moves in the axial direction, the groove width of the V groove changes. The belt 101 is disposed in the V groove. The belt 101 is sandwiched between the opposing surface 11 of the fixed sheave 1 and the opposing surface 31 of the movable sheave 3.

  The movable sheave 3 has an annular groove 32 on a surface opposite to the facing surface 31. The groove 32 is formed at the inner peripheral end of the movable sheave 3. The end of the spring 8 is housed in the groove 32.

[Movable boss]
The movable boss 4 rotates integrally with the movable sheave 3. Further, the movable boss 4 moves in the axial direction integrally with the movable sheave 3. In the present embodiment, the movable boss 4 and the movable sheave 3 are formed by one member. Note that the movable boss 4 and the movable sheave 3 are formed by separate members, respectively, and may be integrally rotated and axially moved by being fixed to each other.

  The movable boss 4 has a cylindrical shape and extends from the movable sheave 3 in the axial direction. Specifically, the movable boss 4 extends from the movable sheave 3 to the first side in the axial direction. That is, the movable boss 4 extends in a direction away from the fixed sheave 1. The center axis of the movable boss 4 is disposed substantially coaxially with the rotation axis O. The movable boss 4 is arranged radially outside the fixed boss 2. That is, the fixed boss 2 extends inside the movable boss 4. The movable boss 4 can slide on the fixed boss 2 without using grease.

  The movable boss 4 is made of, for example, metal. Specifically, the movable boss 4 is made of steel or an aluminum alloy. More specifically, the movable boss 4 is formed of at least one selected from the group consisting of carbon steel and alloy steel.

[Cam section]
As shown in FIG. 3, the cam portion 5 rotates integrally with the movable boss 4. In the present embodiment, the cam portion 5 is configured as a part of the movable boss 4. Specifically, the cam portion 5 is configured as a tip of the movable boss 4. The distal end of the movable boss 4 is an end of the movable boss 4 on the first side in the axial direction.

[Cam receiving member]
The cam receiving member 6 is attached to the tip 21 of the fixed boss 2. Specifically, the cam receiving member 6 has a first through hole 61 that engages with the fixed boss 2. As shown in FIG. 4, the cam receiving member 6 has a pair of first flat surfaces 62 on an inner peripheral surface that defines the first through hole 61. The pair of first flat surfaces 62 extend parallel to each other. When the cam receiving member 6 is attached to the fixed boss 2, the first flat surface 62 faces and is in contact with the third flat surface 23. Therefore, the cam receiving member 6 does not rotate relative to the fixed boss 2 but rotates integrally with the fixed boss 2.

  As shown in FIG. 5, the cam section 5 and the cam receiving member 6 constitute a cam mechanism 10. The cam mechanism 10 is configured to convert the relative rotation of each other into an axial thrust. That is, when the movable boss 4 rotates at a higher speed than the fixed boss 2, the cam mechanism 10 moves the movable sheave 3 toward the fixed sheave 1.

  Specifically, the cam portion 5 that rotates integrally with the movable boss 4 has a cam surface 51. The cam surface 51 is inclined so as to face the rotation direction and face the first side in the axial direction. The cam surface 51 comes into contact with the cam receiving member 6. Note that the rotation direction is a direction in which the movable boss 4 rotates when the vehicle moves forward.

  As shown in FIGS. 3 and 4, the cam receiving member 6 has an annular holder portion 63 and a plurality of cam receiving portions 64. The holder portion 63 has the first through hole 61 described above. The distal end portion 21 of the fixed boss 2 is fitted into the first through hole 61. The holder 63 is made of, for example, metal. Specifically, the holder 63 can be formed of steel, an aluminum alloy, or the like.

  The holder section 63 has an annular main body section 631 and a plurality of mounting sections 632. The mounting portion 632 protrudes from the main body 631 in the radial direction. The cam receiving portion 64 is attached to the attaching portion 632. Specifically, the mounting portion 632 has a groove 633. The cam receiving portion 64 is configured to fit into the groove 633.

  The cam receiving portion 64 is a member that comes into contact with the cam portion 5. The cam receiving portion 64 is attached to the attaching portion 632 of the holder 63. Specifically, the cam receiving portion 64 is sandwiched between the mounting portion 632 and the drive plate 7. The cam receiving portion 64 can be formed of a material different from that of the holder portion 63. For example, the cam receiving portion 64 can be made of resin. More specifically, the cam receiving portion 64 can be formed of a nylon resin, a fluorine resin, a polyetheretherketone resin, a polyphenylene sulfide resin, or the like. Note that the cam receiving portion 64 may be formed of the same material as the holder portion 63. In this case, the cam receiving portion 64 and the holder portion 63 may be integrally formed by one member.

[Sliding member]
As shown in FIG. 1, the sliding member 41 is attached to the inner peripheral surface of the movable boss 4. A metal layer, a sintered body layer, and the like may be interposed between the sliding member 41 and the movable boss 4. The sliding member 41 has a cylindrical shape. The inner peripheral surface of the sliding member 41 is in contact with the outer peripheral surface of the fixed boss 2. Note that a coating film may be formed on the outer peripheral surface of the fixed boss 2.

  The sliding member 41 has a lower coefficient of friction than the movable boss 4. For example, the sliding member 41 is formed of at least one selected from the group consisting of a nylon resin, a fluororesin, a polyetheretherketone-based resin, and a polyphenylenesulfide-based resin. Thus, since the sliding member 41 has a smaller coefficient of friction than the movable boss 4, it can slide on the fixed boss 2 smoothly.

[Dust seal]
The first and second dust seals 42a and 42b are attached to the inner peripheral surface of the movable boss 4. The first dust seal 42a and the second dust seal 42b are spaced apart from each other in the axial direction. The sliding member 41 is disposed between the first dust seal 42a and the second dust seal 42b.

  The first and second dust seals 42a and 42b are in contact with the outer peripheral surface of the fixed boss 2. Therefore, the space between the fixed boss 2 and the movable boss 4 is sealed by the first and second dust seals 42a and 42b.

  The first and second dust seals 42a and 42b are made of synthetic rubber or natural rubber. Specifically, the first and second dust seals 42a and 42b are formed of one selected from the group consisting of nitrile rubber, hydrogenated nitrile rubber, acrylic rubber, and fluoro rubber.

[spring]
The spring 8 is arranged between the drive plate 7 and the movable sheave 3 in a compressed state. The spring 8 urges the movable sheave 3 toward the fixed sheave 1 in the axial direction. That is, the spring 8 urges the movable sheave 3 toward the second side in the axial direction. Thereby, the fixed sheave 1 and the movable sheave 3 sandwich the belt 101. The spring 8 can be, for example, a coil spring. The spring 8 is arranged radially outside the movable boss 4 so as to surround the movable boss 4.

[Spring seat]
The spring seat 9 is configured to support the spring 8. The spring seat 9 is arranged between the movable boss 4 and the spring 8. The spring seat 9 has a cylindrical portion 91 and a flange portion 92. The spring seat 9 is made of, for example, resin. Specifically, the spring seat 9 can be formed of a nylon resin or the like. Further, the spring seat 9 may be made of metal. Specifically, the spring seat 9 can be formed of steel, an aluminum alloy, or the like. The cylindrical portion 91 and the flange portion 92 are integrally formed by one member.

  The cylindrical portion 91 is arranged between the movable boss 4 and the spring 8 in the radial direction. The cylindrical portion 91 supports the spring 8 in the radial direction.

  The flange portion 92 extends radially outward from the cylindrical portion 91. Specifically, the flange portion 92 extends radially outward from an end of the cylindrical portion 91 on the first side in the axial direction. The flange portion 92 is annular. The flange portion 92 supports an end surface on the first side in the axial direction of the spring 8. That is, the flange portion 92 supports the spring 8 in the axial direction.

[Centrifugal clutch]
The centrifugal clutch 12 includes the drive plate 7, a plurality of clutch shoes 122, and a clutch housing 123. The centrifugal clutch 12 is configured to transmit or block the rotation of the fixed sheave 1 and the movable sheave 3 to an output shaft. Specifically, the centrifugal clutch 12 is configured to transmit or block the rotation of the fixed boss 2 to the output shaft.

  The drive plate 7 is attached to the tip 21 of the fixed boss 2. The drive plate 7 rotates integrally with the fixed boss 2. As shown in FIG. 6, the drive plate 7 has a second through hole 71 that engages with the fixed boss 2. The distal end 21 of the fixed boss 2 is fitted into the second through hole 71.

  The drive plate 7 has a pair of second flat surfaces 72 on the inner peripheral surface that defines the second through hole 71. The pair of second flat surfaces 72 extend parallel to each other. In a state where the drive plate 7 is mounted on the fixed boss 2, the second flat surface 72 faces and contacts the third flat surface 23. Therefore, the drive plate 7 does not rotate relative to the fixed boss 2 but rotates integrally with the fixed boss 2. The second through hole 71 of the drive plate 7 has substantially the same shape as the first through hole 61 of the cam receiving member 6.

  The drive plate 7 has a plurality of third through holes 73. The third through holes 73 are arranged in the circumferential direction at an interval from each other. Each third through hole 73 is formed to prevent the cam portion 5 from interfering with the drive plate 7. That is, each third through hole 73 is configured so that the cam portion 5 penetrates.

  The drive plate 7 has a recess 74 at the center. The concave portion 74 is circular when viewed in the axial direction. The recess 74 is recessed on the first side in the axial direction. The spring seat 9 is fitted in the recess 74. Specifically, the inner diameter of the concave portion 74 is substantially the same as or slightly larger than the outer diameter of the flange portion 92 of the spring seat 9. Thereby, the spring seat 9 can be supported by the concave portion 74 of the drive plate 7.

  As shown in FIG. 1, the drive plate 7 is disposed on the first side in the axial direction with respect to the cam receiving member 6. The drive plate 7 holds the cam receiving member 6 between the drive plate 7 and the step portion 24 of the fixed boss 2.

  A thread is formed on the outer peripheral surface of the distal end portion 21 of the fixed boss 2. Then, the nut member 13 is screwed into the distal end portion 21 of the fixed boss 2. The cam member 6 and the drive plate 7 are fixed in the axial direction by the nut member 13.

  The drive plate 7 is made of metal. Specifically, drive plate 7 is made of steel or an aluminum alloy. More specifically, the drive plate 7 is at least one selected from the group consisting of carbon steel and alloy steel.

  One end in the circumferential direction of the clutch shoe 122 is swingably attached to the drive plate 7. The clutch shoe 122 has a friction material (not shown) on the outer peripheral surface. A return spring (not shown) is attached to the other end of the clutch shoe 122 so as to bias each clutch shoe 122 inward in the radial direction.

  The clutch housing 123 is arranged so as to cover each clutch shoe 122 from the outside in the radial direction. The clutch housing 123 rotates relative to the fixed boss 2. Specifically, the clutch housing 123 has a boss 124. A spline groove is formed on the inner peripheral surface of the boss portion 124. The output shaft can be spline-fitted to the boss portion 124.

  When the centrifugal clutch 12 is in the transmission state, the friction material of each clutch shoe 122 frictionally engages with the inner peripheral surface of the clutch housing 123. When the centrifugal clutch 12 is in the disengaged state, the friction material of each clutch shoe 122 separates from the inner peripheral surface of the clutch housing 123. The transmission state of the centrifugal clutch 12 means a state in which the centrifugal clutch 12 transmits the rotation of the fixed sheave 1 and the movable sheave 3 to the output shaft. Further, the disconnected state of the centrifugal clutch 12 means a state in which the centrifugal clutch 12 does not transmit the rotation of the fixed sheave 1 and the movable sheave 3 to the output shaft.

[attachment]
In the pulley device 100 configured as described above, the cam receiving member 6 is attached to the distal end portion 21 of the fixed boss 2. When the cam receiving member 6 is attached, the positioning is performed so that the distal end portion 21 is fitted into the first through hole 61 of the cam receiving member 6. Further, the positioning is performed so that the cam portion 5 and the cam receiving member 6 mesh with each other.

  Next, the drive plate 7 is attached to the distal end portion 21 of the fixed boss 2 while compressing the spring 8. When mounting the drive plate 7, it is only necessary to perform positioning so that the distal end portion 21 is fitted into the second through hole 71 of the drive plate 7. That is, it is not necessary to align the drive plate 7 and the cam portion 5.

[motion]
The pulley device 100 configured as described above operates as follows.

  In the pulley device on the driving side, when the width of the groove formed by the fixed sheave and the movable sheave becomes narrow, the winding diameter of the belt 101 becomes large. That is, the belt 101 moves outward in the radial direction in the pulley device on the driving side.

  In the driven-side pulley device 100, the width of the groove formed by the fixed sheave 1 and the movable sheave 3 operates in the opposite direction to the groove width in the drive-side pulley device. That is, when the belt 101 moves outward in the radial direction in the pulley device on the driving side, the belt 101 moves inward in the radial direction in the pulley device 100 on the driven side.

  When the belt 101 moves inward in the radial direction, the movable sheave 3 moves in a direction away from the fixed sheave 1 against the urging force of the spring 8. That is, the movable sheave 3 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 3 increases.

  In the drive-side pulley device, when the width of the groove formed by the fixed sheave and the movable sheave is increased, the winding diameter of the belt 101 is reduced. That is, the belt 101 moves radially inward in the drive-side pulley device.

  When the belt 101 moves radially inward in the driving pulley device, the belt 101 moves radially outward in the driven pulley device 100. Then, the movable sheave 3 moves in a direction approaching the fixed sheave 1 by the urging force of the spring 8. As a result, the width of the groove between the fixed sheave 1 and the movable sheave 3 is reduced.

  Next, the operation of the cam mechanism 10 will be described. When the vehicle accelerates suddenly, such as when starting, the movable sheave 3 rotates at a higher speed than the fixed sheave 1. Then, the movable boss 4 rotates at a higher speed than the fixed boss 2. That is, the movable boss 4 rotates relatively to the fixed boss 2 in the rotation direction. Then, the cam mechanism 10 applies an axial thrust to the movable boss 4, and the movable boss 4 moves to the second side in the axial direction. Specifically, the cam surface 51 receives a reaction force from the cam receiving member 6 toward the second side in the axial direction, and the movable boss 4 moves to the second side in the axial direction. As a result, the movable sheave 3 moves toward the fixed sheave 1 and firmly clamps the belt 101.

[Modification]
Although the embodiments of the present invention have been described above, the present invention is not limited to these, and various modifications can be made without departing from the spirit of the present invention.

  (A) In the above embodiment, the drive plate 7 is fixed by the nut member 13, but a retaining ring or the like may be used instead of the nut member 13.

  (B) In the above embodiment, the cam portion 5 is configured as a part of the movable boss 4, but the cam portion 5 may be configured by a member different from the movable boss 4.

  (C) In the above embodiment, the cam receiving member 6 has the holder portion 63 and the cam receiving portion 64 formed as separate members, but the holder portion 63 and the cam receiving portion 64 are integrally formed by one member. It may be configured.

  (D) In the above embodiment, the pulley device 100 has the spring seat 9, but need not have the spring seat 9. Further, the spring seat 9 may be integrally formed with the drive plate 7 by one member.

1: fixed sheave 2: fixed boss 3: movable sheave 4: movable boss 5: cam portion 6: cam receiving member 61: first through hole 63: holder portion 64: cam receiving portion 7: drive plate 71: second through hole 8: Spring 9: Spring seat 100: Pulley device

Claims (7)

Fixed sheave,
A fixed boss extending axially from the fixed sheave,
A movable sheave movable in the axial direction so as to approach and separate from the fixed sheave,
A movable boss extending in the axial direction from the movable sheave,
A cam portion that rotates integrally with the movable boss,
A cam receiving member having a first through hole engaged with the fixed boss;
A drive plate having a second through hole engaging with the fixing boss;
A spring disposed in a compressed state between the drive plate and the movable sheave,
With
The cam portion and the cam receiving member are configured to convert a relative rotation of each other into an axial thrust.
Pulley device.
Further comprising a tubular spring seat disposed between the spring and the movable boss,
The pulley device according to claim 1.
The cam receiving member has an annular holder portion having the first through hole, and a cam receiving portion attached to the holder portion.
The pulley device according to claim 1.
The holder portion and the cam receiving portion are formed of mutually different materials,
The pulley device according to claim 3.
The holder has a mounting portion projecting in a radial direction,
The cam receiving portion is sandwiched between the mounting portion and the drive plate,
The pulley device according to claim 3 or 4.
The cam portion is configured as a part of the movable boss,
The pulley device according to claim 1.
The cam receiving member has a pair of first flat surfaces on an inner peripheral surface that defines the first through hole,
The drive plate has a pair of second flat surfaces on an inner peripheral surface that defines the second through hole,
The fixing boss has a pair of third flat surfaces facing the pair of first flat surfaces and the pair of second flat surfaces on an outer peripheral surface,
The pulley device according to claim 1.

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