JP2020067160A - Quenched component and pulley device using the same - Google Patents

Abstract

To provide a quenched component which can be arranged as designed with respect to an adjacent component.SOLUTION: A pulley device has a fixed boss and a movable boss. The movable boss is constructed to slide on the fixed boss. The fixed boss has a through hole into which a pin is inserted. Torque is given from the movable boss to the pin, and the pin may cause the enlargement of the through hole of the fixed boss by the torque. To prevent the enlargement of the through hole, quenching treatment is applied to the fixed boss having the through hole. The fixed boss (the quenched component) includes a shaft shaped component body 46, a recessed part 44, and a quenched part 43, the recessed part 44 being formed on the shaft shaped component body 46, the quenched part 43 being formed in the recessed part 44.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a hardened part and a pulley device.

  It is common practice to subject parts that require strength to quenching to improve their hardness. For example, the pulley device disclosed in Patent Document 1 has a fixed sheave and a movable sheave. The movable sheave is configured to slide on the fixed sheave. The fixed sheave has a through hole into which the pin is inserted. Torque acts on the pin from the movable sheave, and the torque may cause the pin to enlarge the through hole of the fixed sheave. In order to prevent the expansion of the through holes, the solid sheave in which the through holes are formed is entirely quenched.

JP, 2016-65570, A

  As described above, when the quench-hardening process is performed on the entire quench-hardened part, the quench-hardened part may expand due to thermal deformation of the entire hardened part. When a product is assembled using the hardened parts that have been thermally deformed in this way, the hardened parts are not placed as designed with respect to the adjacent parts, and the hardened parts do not slide smoothly with the adjacent members, or For example, there may be a problem that the component does not adhere to the adjacent member. Therefore, conventionally, it has been necessary to shape the hardened part by polishing the hardened part to remove the deformed portion.

  An object of the present invention is to provide a quenched component that can be arranged as designed with respect to an adjacent component.

  A quenched component according to the first aspect of the present invention includes a shaft-shaped component body, a recess, and a quenched portion. The recess is formed on the shaft-shaped component body. The hardened portion is formed in the recess.

  According to this configuration, since the quenching portion is formed in the recess, the portion that is thermally deformed on the shaft-shaped component body is inside the recess, and the portions other than the recess are not thermally deformed. The thermally deformed recess does not come into contact with the adjacent component. In this way, in the quenched component, the portion that thermally deforms does not contact the adjacent component, and the portion that does not thermally deform contacts the adjacent component, so that the quenched component can be arranged as designed with respect to the adjacent component. Further, it is possible to omit the polishing step for removing the deformed portion as in the conventional case.

  Preferably, the shaft-shaped component body has a facing surface arranged to face an adjacent component. The facing surface has a first region that is in contact with the adjacent component, and a second region that is spaced from the adjacent component. The recess is formed in the second region. According to this configuration, since the recess is formed in the second region that does not contact the adjacent component, it is possible to suppress the influence of the formation of the recess on the adjacent component.

  Preferably, the hardened part further comprises a hole formed in the recess.

  Preferably, the quenched component further includes a coating layer that covers the shaft-shaped component body.

  Preferably, the shaft-shaped component body has a tubular shape.

  Preferably, the recess is formed on the outer surface of the shaft-shaped component body.

  A pulley device according to a second aspect of the present invention includes a fixed sheave, a movable sheave, any of the above-described quenching parts, and a tubular adjacent part. The movable sheave is movable in the axial direction so as to move toward and away from the fixed sheave. The hardened part is tubular and extends axially from the fixed sheave. Adjacent components extend axially from the moveable sheave.

  According to the present invention, it is possible to arrange a quenched component with respect to an adjacent component as designed.

FIG. 3 is a side sectional view of the pulley device. FIG. 3 is a side sectional view of a fixed boss. The expanded sectional view of the 2nd area | region of a fixed boss. FIG. 3 is a side sectional view of the pulley device. The side sectional view of a movable boss. The side view of a movable boss. The expanded sectional view of the 2nd field of the fixed boss which concerns on a modification.

  Hereinafter, an embodiment of a pulley device using a hardened part according to the present invention will be described with reference to the drawings. The pulley device 100 according to the present embodiment is the driven pulley device 100. Torque is transmitted to the driven pulley device 100 from a 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 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 around the rotation axis O. The outer side in the radial direction means a side away from the rotating shaft O in the radial direction, and the inner side in the radial direction means a side approaching the rotating shaft 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 means 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 movable sheave 2, a fixed boss 4, and a movable boss 5. The pulley device 100 further includes a coil spring 3, a centrifugal clutch 6, and a cam mechanism 8. The fixed boss 4 corresponds to the quenched component of the present invention, and the movable boss 5 corresponds to the adjacent component of the present invention.

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

  The fixed sheave 1 is disk-shaped and has a through hole 1a at the center. The facing surface 1b of the fixed sheave 1 is inclined so as to move away from the movable sheave 2 toward the outer side in the radial direction. That is, the facing surface 1b is inclined outward in the radial direction toward the second side in the axial direction. The facing surface 1b of the fixed sheave 1 is a surface facing the movable sheave 2. That is, the facing surface 1b of the fixed sheave 1 faces the first side in the axial direction.

[Fixed boss]
The fixed boss 4 extends from the fixed sheave 1 in the axial direction. The central axis of the fixed boss 4 is arranged substantially coaxially with the rotation axis O. The fixed boss 4 slides relative to the movable boss 5 in the axial direction. Specifically, the movable boss 5 slides on the fixed boss 4 in the axial direction.

  As shown in FIG. 2, the fixed boss 4 has a third end portion 4a, a fourth end portion 4b, a plurality of first hole portions 4c, and a plurality of second hole portions 4e. The fixed boss 4 has a cylindrical shape. The fixed boss 4 is made of a steel material.

  The third end 4a is an end on the first side in the axial direction. The centrifugal clutch 6 is attached to the third end 4a. The third end 4a has a mounting surface extending parallel to each other on the outer peripheral surface. Since the outer diameter of the third end portion 4a is smaller than that of the other portions, the shoulder portion 4d is formed.

  The fourth end 4b of the fixed boss 4 is an end on the second side in the axial direction. As shown in FIG. 1, the fixed sheave 1 is fixed to the fourth end 4b. Specifically, the fourth end 4b is inserted into and fixed to the through hole 1a of the fixed sheave 1. Therefore, the fixed boss 4 rotates integrally with the fixed sheave 1. The outer diameter of the fourth end 4b is larger than the outer diameters of the other parts.

  The output shaft (not shown) extends in the axial direction inside the fixed boss 4. The output shaft is, for example, a shaft for transmitting torque to the rear wheels. The output shaft and the fixed boss 4 rotate relative to each other. The bearings 11 and 12 are arranged between the output shaft and the fixed boss 4.

  As shown in FIGS. 2 and 3, the fixed boss 4 has a fixed boss body 46, a first recess 44, and a quenching portion 43. The fixed boss body 46 has a tubular shape. The fixed boss body 46 corresponds to the shaft-shaped component body of the invention, and the first recess 44 corresponds to the recess of the invention.

  The fixed boss body 46 has an outer peripheral surface 40 (an example of a facing surface). The outer peripheral surface 40 of the fixed boss body 46 is arranged so as to face the movable boss 5. Specifically, the fixed boss 4 extends inside the movable boss 5, and the outer peripheral surface 40 of the fixed boss main body 46 faces the inner peripheral surface of the movable boss 5.

  The outer peripheral surface 40 has a first region 41 and a second region 42. The first region 41 is in contact with the movable boss 5. Specifically, the first region 41 is a region that can come into contact with the inner peripheral surface of the movable boss 5 when the fixed boss 4 and the movable boss 5 relatively slide. That is, the first region 41 is a region that slides on the inner peripheral surface of the movable boss 5. In addition, in the present embodiment, the first region 41 is divided into two in the axial direction. That is, the second region 42 is arranged at the central portion in the axial direction. The first region 41 is arranged at both ends in the axial direction so as to sandwich the second region 42.

  The second region 42 is arranged at a distance from the movable boss 5 in the radial direction. Specifically, the second region 42 is a region that cannot contact the inner peripheral surface of the movable boss 5 when the fixed boss 4 and the movable boss 5 relatively slide. That is, the second region 42 is a region that does not slide on the inner peripheral surface of the movable boss 5. It should be noted that a region of the inner peripheral surface of the movable boss 5 that can be opposed to the second region 42 is recessed radially outward so that a space is provided between the second region 42 and the inner peripheral surface of the movable boss 5.

  As shown in FIG. 3, the first recess 44 is formed on the fixed boss body 46. Specifically, the first recess 44 is formed on the outer peripheral surface 40 of the fixed boss body 46. More specifically, the first recess 44 is formed in the second region 42 of the fixed boss body 46. Since the first recess 44 is formed in the second region 42 where the movable boss 5 does not slide in this way, it does not affect the sliding of the movable boss 5.

  The first recess 44 is formed in an annular shape and extends over the outer peripheral surface 40 of the fixed boss 4 over the entire circumference. Therefore, the outer diameter of the fixed boss body 46 in the portion where the first recess 44 is formed is smaller than the outer diameter of the fixed boss body 46 in the portion where the first recess 44 is not formed.

  The quenched portion 43 is formed in the first recess 44. The quenching part 43 is formed in an annular shape. That is, the hardened portion 43 extends along the first recess 44 over the entire circumference of the outer peripheral surface 40 of the fixed boss body 46. A first hole 4c and a second hole 4e are formed in the first recess 44. The torque pin 81 is inserted into the first hole 4c. The second hole 4e is filled with grease.

  The quenched portion 43 may partially protrude from the inside of the first recess 44. That is, both end portions in the axial direction of the hardened portion 43 may partially protrude from the first recess 44. For example, the protruding portion of the quenched portion 43 is preferably within 5 mm on each side in the axial direction. The portion of the hardened portion 43 that protrudes from the first recess 44 is not thermally deformed by quenching. Therefore, it does not affect the sliding between the fixed boss 4 and the movable boss 5. In addition, preferably, the hardened portion 43 is formed only in the second region 42 and not in the first region 41.

  The hardened portion 43 can be formed by, for example, induction hardening, but may be formed by another method such as laser hardening. In the present embodiment, the quenched portion 43 is formed by tempering after quenching. As a result, the hardened portion 43 has a higher hardness (for example, Rockwell hardness) than the other portions of the fixed boss 4. In particular, the hardness of the inner wall surface that defines the first hole portion 4c is high, so that even if the torque pin 81 is tilted by the torque, abrasion and deformation of the inner wall surface of the first hole portion 4c are suppressed.

[Movable sheave]
As shown in FIG. 1, the movable sheave 2 is arranged so as to rotate about a rotation axis O. The central axis of the movable sheave 2 is arranged substantially coaxially with the rotation axis O. The movable sheave 2 is arranged so as to move along the rotation axis O. That is, the movable sheave 2 is arranged so as to move in the axial direction. The movable sheave 2 is arranged on the first side of the fixed sheave 1 in the axial direction.

  The movable sheave 2 is disk-shaped and has a through hole 2a at the center. The facing surface 2b of the movable sheave 2 is inclined so as to move away from the fixed sheave 1 toward the outer side in the radial direction. That is, the facing surface 2b is inclined toward the first side in the axial direction toward the outer side in the radial direction.

  The facing surface 2b of the movable sheave 2 is a surface facing the fixed sheave 1. That is, the facing surface 2b of the movable sheave 2 faces the second side in the axial direction. The facing surface 1b of the fixed sheave 1 and the facing surface 2b of the movable sheave 2 face each other with a gap. That is, the facing surface 1 b of the fixed sheave 1 and the facing surface 2 b of the movable sheave 2 form a V groove. The groove width of the V groove changes as the movable sheave 2 moves in the axial direction. The belt 101 is arranged in the V groove. The belt 101 is held between the facing surface 1b of the fixed sheave 1 and the facing surface 2b of the movable sheave 2.

  The fixed sheave 1 and the movable sheave 2 are configured to sandwich the belt 101 between an outer peripheral side position and an inner peripheral side position in the radial direction. That is, the belt 101 moves between the outer peripheral side position and the inner peripheral side position. 1 is a diagram when the belt 101 is located at the inner peripheral side position, and FIG. 4 is a diagram when the belt 101 is located at the outer peripheral side position. It should be noted that the belt 101 is at the outer peripheral side position during low speed traveling, and the belt 101 is at the inner peripheral side position during high speed traveling.

[Movable boss]
The movable boss 5 has a cylindrical shape and extends in the axial direction. The central axis of the movable boss 5 is arranged substantially coaxially with the rotation axis O. The movable boss 5 is arranged so as to cover the fixed boss 4. The inner peripheral surface of the movable boss 5 may come into contact with the first region 41 of the outer peripheral surface 40 of the fixed boss 4 when the movable boss 5 slides.

  The movable boss 5 is slidable on the fixed boss 4 in the axial direction. As shown in FIG. 5, the movable boss 5 has a fifth end portion 5a and a sixth end portion 5b. The fifth end 5a is an end on the first side in the axial direction, and the sixth end 5b is an end on the second side in the axial direction.

  The movable sheave 2 is fixed to the sixth end 5b. Specifically, the sixth end 5b is inserted into the through hole 2a of the movable sheave 2 and fixed by, for example, welding. Therefore, the movable sheave 2 and the movable boss 5 rotate integrally.

  The movable boss 5 has a movable boss body 5c and a cover 5d. The movable boss body 5c has a cylindrical shape. As shown in FIGS. 5 and 6, the movable boss body 5c has a plurality of cam grooves 5e. Each cam groove 5e extends in the axial direction. The cam grooves 5e are arranged at intervals in the circumferential direction.

  The cover 5d has a cylindrical shape. The cover 5d is arranged so as to cover the outer peripheral surface of the movable boss body 5c. Specifically, the boss body 5c is provided with an O-ring 5f, and the inner peripheral surface of the cover 5d is in contact with the outer peripheral surface of the movable boss body 5c via the O-ring 5f. The movable boss body 5c and the cover 5d are fixed to each other at least in the axial direction. Since the cover 5d covers the outer peripheral surface of the movable boss body 5c in this way, the cam groove 5e is sealed.

  The movable boss 5 has a second recess 51 on the inner peripheral surface. The second recess 51 is annular and extends over the entire circumference of the inner peripheral surface of the movable boss 5. The second recess 51 is arranged so as to face the second region 42 of the fixed boss 4 when the movable boss 5 slides. The second concave portion 51 forms a space between the second region 42 of the fixed boss 4 and the inner peripheral surface of the movable boss 5. The second recess 51 and the cam groove 5e are filled with grease or the like.

  The gap height, which is the sum of the depth of the first recess 44 and the depth of the second recess 51, can be determined in consideration of the bulge height of the quenching portion 43. For example, when the bulge height of the quenched portion 43 is about 0.02 to 0.30 mm, the gap height obtained by combining the depths of the first recessed portion 44 and the second recessed portion 51 is also about 0.02 to 0.30 mm. Can be For example, the depth of the first recess 44 can be about 0.02 to 0.30 mm. Further, the depth of the second recess 51 can be about 0.02 to 0.30 mm.

[Cam mechanism]
As shown in FIG. 1, the cam mechanism 8 includes a plurality of torque pins 81 and a plurality of cam grooves 5e (see FIG. 5). The cam mechanism 8 is configured to convert the relative rotation of the movable boss 5 with respect to the fixed boss 4 into an axial thrust of the movable boss 5.

  Each torque pin 81 is configured to protrude outward in the radial direction from the outer peripheral surface of the fixed boss 4. In detail, each torque pin 81 is inserted and fixed in the first hole 4c of the fixed boss 4. Further, the protruding portion of each torque pin 81 is arranged in each cam groove 5e. Each torque pin 81 is slidable in each cam groove 5e.

  Each torque pin 81 has a pin body 81a and a ring 81b. The pin body 81a has a columnar shape and projects outward in the radial direction from the outer peripheral surface of the fixed boss 4. The pin body 81a is inserted and retained in the first hole portion 4c of the fixed boss 4.

  The ring 81b is arranged so as to cover the outer peripheral surface of the pin body 81a. Specifically, the ring 81b covers a portion of the pin body 81a that protrudes from the fixed boss 4.

  As shown in FIGS. 5 and 6, each cam groove 5e is formed in the movable boss body 5c of the movable boss 5. Each cam groove 5e extends in the axial direction and is inclined in the circumferential direction. Each torque pin 81 can slide in each cam groove 5e.

[coil spring]
As shown in FIG. 1, the coil spring 3 urges the movable sheave 2 toward the fixed sheave 1. That is, the coil spring 3 urges the movable sheave 2 toward the second axial side. As a result, the fixed sheave 1 and the movable sheave 2 sandwich the belt 101.

  Specifically, as shown in FIG. 1, the coil spring 3 is compressed when the belt 101 is at the inner peripheral side position. Further, as shown in FIG. 4, when the belt 101 is at the outer peripheral side position, the coil spring 3 moves the movable sheave 2 toward the second side in the axial direction.

[Centrifugal clutch]
As shown in FIG. 1, the centrifugal clutch 6 has a drive plate 61, a plurality of weights 62, and a clutch housing 63. The centrifugal clutch 6 is configured to transmit and block the rotation of the fixed sheave 1 and the movable sheave 2 to the output shaft. Specifically, the centrifugal clutch 6 is configured to transmit or block the rotation of the fixed boss 4 to the output shaft.

  The drive plate 61 is attached to the third end 4 a of the fixed boss 4. The drive plate 61 rotates integrally with the fixed boss 4. More specifically, the drive plate 61 is a disc-shaped plate having a through hole 61a at the center. The through hole 61a is shaped so as to engage with the third end 4a of the fixed boss 4. Specifically, the peripheral edge of the through hole 61 a has substantially the same shape as the outer peripheral edge of the fixed boss 4.

  The drive plate 61 comes into contact with the shoulder portion 4d of the fixed boss 4 to restrict the movement of the drive plate 61 toward the second side in the axial direction. A nut 64 is screwed onto the third end 4 a of the fixed boss 4 on the first axial side of the drive plate 61. The nut 64 also restricts the drive plate 61 from moving toward the first side in the axial direction.

  One end of each weight 62 in the circumferential direction is swingably attached to the drive plate 61. A friction material 65 is fixed to the outer peripheral surface of each weight 62. A return spring 66 is attached to the other end of each weight 62 so as to bias each weight 62 inward in the radial direction.

  The clutch housing 63 is arranged so as to cover each weight 62 from the outside in the radial direction. The clutch housing 63 is supported by the fixed boss 4 so as to be relatively rotatable. Specifically, the clutch housing 63 has a boss portion 63a. A spline hole 63b is formed in the boss portion 63a. The output shaft can be spline-engaged with the spline hole 63b.

  When the centrifugal clutch 6 is in the transmission state, the friction material 65 of each weight 62 frictionally engages with the inner peripheral surface of the clutch housing 63. When the centrifugal clutch 6 is in the disengaged state, the friction material 65 of each weight 62 separates from the inner peripheral surface of the clutch housing 63. The transmission state of the centrifugal clutch 6 means a state in which the centrifugal clutch 6 transmits the rotations of the fixed sheave 1 and the movable sheave 2 to the output shaft. The disengaged state of the centrifugal clutch 6 means a state in which the centrifugal clutch 6 does not transmit the rotations of the fixed sheave 1 and the movable sheave 2 to the output shaft.

[Operation of pulley device]
The pulley device configured as described above operates as follows.

  In the drive side pulley device, 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 radially outward in the drive-side pulley device.

  In the driven pulley device 100, the width of the groove formed by the fixed sheave 1 and the movable sheave 2 operates opposite to the groove width in the drive pulley device. That is, when the belt 101 moves radially outward in the drive-side pulley device, the belt 101 moves radially inward in the driven-side pulley device 100.

  When the belt 101 moves inward in the radial direction, the movable sheave 2 moves in a direction away from the fixed sheave 1 against the biasing force of the coil spring 3. 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 increases.

  Further, 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 inward in the radial direction 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 biasing force of the coil spring 3 causes the movable sheave 2 to move toward the fixed sheave 1. As a result, the width of the groove between the fixed sheave 1 and the movable sheave 2 becomes narrow.

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

Modification 1
As shown in FIG. 7, the fixed boss 4 may further include a coating layer 45. The coating layer 45 covers the outer peripheral surface 40 of the fixed boss body 46. The coating layer 45 can be formed by plating, for example.

Modification 2
In the above embodiment, the fixed boss 4 is illustrated as the quenching component, but the quenching component is not limited to this. For example, the quenching component may have a plate shape instead of the cylindrical shape like the fixed boss 4. Further, the quenched component and the adjacent component may not be slidable relative to each other.

DESCRIPTION OF SYMBOLS 1 Fixed sheave 2 Movable sheave 4 Fixed boss 40 Outer peripheral surface 41 First region 42 Second region 43 Quenched portion 44 First recess 45 Covering layer 46 Fixed boss body 4c Hole 5 Movable boss

Claims (7)

A shaft-shaped component body,
A recess formed on the shaft-shaped component body,
A quenching portion formed in the recess,
Hardened parts equipped with.
The shaft-shaped component body has a facing surface arranged to face an adjacent component,
The facing surface has a first region in contact with the adjacent component and a second region spaced apart from the adjacent component,
The recess is formed in the second region,
The quenched component according to claim 1.
Further comprising a hole formed in the recess,
The quenched component according to claim 1.
Further comprising a coating layer covering the shaft-shaped component body,
Hardened parts according to any one of claims 1 to 3.
The shaft-shaped component body has a tubular shape,
The quenched component according to claim 1.
The recess is formed on an outer surface of the shaft-shaped component body,
The quenched component according to claim 5.
A fixed sheave,
A movable sheave movable in the axial direction so as to approach and separate from the fixed sheave,
A quench-hardened part according to any one of claims 1 to 6, which is cylindrical and extends axially from the fixed sheave,
A tubular adjacent component extending in the axial direction from the movable sheave,
And a pulley device.

Images