JP7283884B2 - Hardened part and pulley device using the same - Google Patents

Description

The present invention relates to hardened parts and pulley devices.

Hardening is generally performed on parts that require strength to improve 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 over the fixed sheave. This stationary sheave has a through hole into which a pin is inserted. Torque from the movable sheave acts on the pin, and this torque may cause the pin to expand the through hole of the fixed sheave. In order to prevent the through-holes from expanding, the solid sheave having the through-holes formed therein is entirely quenched.

JP 2016-65570 A

As described above, if the entire quenched part is quenched, the entire quenched part may be thermally deformed and swelled. When a product is assembled using such thermally deformed quenched parts, the quenched parts are not arranged with respect to the adjacent parts as designed, and the quenched parts do not slide smoothly with the adjacent parts. Problems such as parts not coming into close contact with adjacent members may occur. For this reason, conventionally, it has been necessary to remove the deformed portion by shaping the quenched part by polishing the quenched part.

SUMMARY OF THE INVENTION An object of the present invention is to provide a hardened part that can be arranged as designed with respect to adjacent parts.

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

According to this configuration, since the quenched portion is formed within the recess, the portion of the shaft-like part main body that is thermally deformed is within the recess, and the portion other than the recess is not thermally deformed. Then, the thermally deformed recesses do not contact adjacent parts. In this way, the heat-deformed portion of the quenched component does not abut on the adjacent component, and the non-thermally-deformed portion abuts on the adjacent component. In addition, it is also possible to omit the polishing process for removing the deformed portion as in the conventional art.

Preferably, the shaft-like part main body has a facing surface arranged to face the adjacent part. The facing surface has a first region that contacts an adjacent component and a second region that is spaced from the adjacent component. A 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 includes a hole formed in the recess.

Preferably, the hardened part further includes a coating layer covering the shaft-like part main body.

Preferably, the shaft-like part main body is tubular.

Preferably, the recess is formed on the outer surface of the shaft-like part body.

A pulley device according to a second aspect of the present invention includes a fixed sheave, a movable sheave, any one of the hardened parts described above, and a cylindrical adjacent part. The movable sheave is axially movable toward and away from the fixed sheave. The hardened part is cylindrical and extends axially from the stationary sheave. An adjacent component extends axially from the movable sheave.

According to the present invention, the hardened parts can be arranged as designed with respect to the adjacent parts.

Side sectional drawing of a pulley apparatus. Side cross-sectional view of a fixed boss. FIG. 4 is an enlarged cross-sectional view of a second region of the fixed boss; Side sectional drawing of a pulley apparatus. Side cross-sectional view of a movable boss. The side view of a movable boss. FIG. 11 is an enlarged cross-sectional view of a second region of a fixed boss according to a modification;

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of a pulley device using hardened parts according to the present invention will be described below with reference to the drawings. In addition, the pulley device 100 according to the present embodiment is the pulley device 100 on the driven side. Torque is transmitted to the driven-side pulley device 100 via a belt 101 from a driving-side 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. FIG. In addition, 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. As shown in FIG. 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 closer to the rotation axis O in the radial direction. Axial means a direction along the axis of rotation O. The first axial side means the left side in FIG. 1 and the second axial side means the right side in FIG. The circumferential direction means the circumferential direction of a circle centered on the rotation axis O. As shown in FIG.

[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 part of the present invention, and the movable boss 5 corresponds to the adjacent part of the present invention.

[Fixed sheave]
The fixed sheave 1 is arranged so as to rotate about the rotation axis O. As shown in FIG. The central axis of the fixed sheave 1 is arranged substantially coaxially with the rotation axis O. As shown in FIG. 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 axially.

The stationary sheave 1 is disc-shaped and has a through hole 1a in the center. The facing surface 1b of the fixed sheave 1 is inclined away from the movable sheave 2 toward the outer side in the radial direction. That is, the facing surface 1b is inclined radially outward toward the second side in the axial direction. The facing surface 1b of the fixed sheave 1 is the surface facing the movable sheave 2. As shown in FIG. That is, the facing surface 1b of the fixed sheave 1 faces the first side in the axial direction.

[Fixed Boss]
A fixed boss 4 extends axially from the fixed sheave 1 . A central axis of the fixed boss 4 is arranged substantially coaxially with the rotation axis O. As shown in FIG. 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 4a, a fourth end 4b, a plurality of first holes 4c, and a plurality of second holes 4e. The fixed boss 4 is cylindrical. The fixed boss 4 is made of a steel material.

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

The fourth end 4b of the fixed boss 4 is the 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 portion 4b is inserted into the through hole 1a of the fixed sheave 1 and fixed. Therefore, the fixed boss 4 rotates integrally with the fixed sheave 1 . In addition, the outer diameter of the fourth end portion 4b is larger than the outer diameter of other portions.

An output shaft (not shown) extends axially 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. 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 concave portion 44 and a hardened portion 43 . The fixed boss body 46 is cylindrical. The fixed boss main body 46 corresponds to the shaft-like part main body of the present invention, and the first concave portion 44 corresponds to the concave portion of the present 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 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 area 41 is in contact with the movable boss 5 . Specifically, the first area 41 is an area 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 slide relative to each other. 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 in the central portion in the axial direction. The first regions 41 are arranged at both ends in the axial direction so as to sandwich the second regions 42 .

The second region 42 is spaced apart from the movable boss 5 in the radial direction. Specifically, the second region 42 is a region that cannot come into contact with the inner peripheral surface of the movable boss 5 when the fixed boss 4 and the movable boss 5 slide relative to each other. That is, the second area 42 is an area that does not slide on the inner peripheral surface of the movable boss 5 . A space is provided between the second region 42 and the inner peripheral surface of the movable boss 5 by recessing a region of the inner peripheral surface of the movable boss 5 that can face the second region 42 radially outward.

As shown in FIG. 3, first recess 44 is formed on 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, first recess 44 is formed in second region 42 of fixed boss body 46 . Since the first concave portion 44 is formed in the second region 42 where the movable boss 5 does not slide, 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 entire circumference of the outer peripheral surface 40 of the fixed boss 4 . Therefore, the outer diameter of the fixed boss body 46 at the portion where the first recess 44 is formed is smaller than the outer diameter of the fixed boss body 46 at the portion where the first recess 44 is not formed.

The hardened portion 43 is formed inside the first recess 44 . The hardened portion 43 is formed in an annular shape. That is, the hardened portion 43 extends along the first recess 44 along the entire circumference of the outer peripheral surface 40 of the fixed boss body 46 . A first hole portion 4c and a second hole portion 4e are formed in the first concave portion 44. As shown in FIG. A torque pin 81 is inserted into the first hole portion 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 ends of the hardened portion 43 in the axial direction may partially protrude from the first recess 44 . For example, the protruding portion of the hardened portion 43 is preferably 5 mm or less per side in the axial direction. A portion of the quenched portion 43 protruding from the first concave portion 44 is not thermally deformed by quenching. Therefore, the sliding between the fixed boss 4 and the movable boss 5 is not affected. Preferably, the hardened portion 43 is formed only in the second region 42 and not formed in the first region 41 .

The hardened portion 43 can be formed by induction hardening, for example, but may be formed by other methods such as laser hardening. In this 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 other portions of the fixed boss 4 . In particular, since the inner wall surface defining the first hole portion 4c has high hardness, wear and deformation of the inner wall surface of the first hole portion 4c are suppressed even if the torque pin 81 is tilted by torque.

[Movable sheave]
As shown in FIG. 1, the movable sheave 2 is arranged to rotate about the rotation axis O. As shown in FIG. A central axis of the movable sheave 2 is arranged substantially coaxially with the rotation axis O. As shown in FIG. The movable sheave 2 is arranged to move along the rotation axis O. As shown in FIG. That is, the movable sheave 2 is arranged 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 disc-shaped and has a through hole 2a in the center. The facing surface 2b of the movable sheave 2 is inclined away from the fixed sheave 1 as it goes radially outward. That is, the facing surface 2b is inclined radially outward toward the first side in the axial direction.

A facing surface 2 b 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 therebetween. That is, the opposed surface 1b of the fixed sheave 1 and the opposed surface 2b of the movable sheave 2 form a V-groove. As the movable sheave 2 moves in the axial direction, the groove width of the V groove changes. A belt 101 is arranged in this V-groove. The belt 101 is sandwiched between the facing surface 1b of the fixed sheave 1 and the facing surface 2b of the movable sheave 2. As shown in FIG.

The fixed sheave 1 and the movable sheave 2 are configured to sandwich the belt 101 between radially outer and inner positions. That is, the belt 101 moves between the outer peripheral position and the inner peripheral position. 1 is a diagram when the belt 101 is positioned on the inner peripheral side, and FIG. 4 is a diagram when the belt 101 is positioned on the outer peripheral side. It should be noted that the belt 101 is positioned on the outer peripheral side during low speed running, and the belt 101 is positioned on the inner peripheral side during high speed running.

[Movable boss]
The movable boss 5 is cylindrical and extends in the axial direction. A central axis of the movable boss 5 is arranged substantially coaxially with the rotation axis O. As shown in FIG. The movable boss 5 is arranged so as to cover the fixed boss 4 . The inner peripheral surface of the movable boss 5 can 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 5a and a sixth end 5b. The fifth end 5a is the end on the first side in the axial direction, and the sixth end 5b is the end on the second side in the axial direction.

The movable sheave 2 is fixed to the sixth end 5b. Specifically, the sixth end portion 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 is cylindrical. 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 spaced apart from each other in the circumferential direction.

The cover 5d is cylindrical. The cover 5d is arranged so as to cover the outer peripheral surface of the movable boss body 5c. Specifically, the movable 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 thus covers the outer peripheral surface of the movable boss body 5c, the cam groove 5e is sealed.

The movable boss 5 has a second concave portion 51 on its inner peripheral surface. The second recessed portion 51 is annular and extends along the entire circumference of the inner peripheral surface of the movable boss 5 . The second recess 51 is arranged to face the second region 42 of the fixed boss 4 when the movable boss 5 slides. The second recess 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 height of the gap, which is the sum of the depth of the first concave portion 44 and the depth of the second concave portion 51, can be determined in consideration of the swelling height of the hardened portion 43. As shown in FIG. For example, when the bulging height of the hardened portion 43 is about 0.02 to 0.30 mm, the height of the gap obtained by combining the depth of the first recess 44 and the depth of the second recess 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. Also, the depth of the second concave portion 51 can be set to 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 relative rotation of the movable boss 5 with respect to the fixed boss 4 into axial thrust of the movable boss 5 .

Each torque pin 81 is configured to protrude radially outward from the outer peripheral surface of the fixed boss 4 . Specifically, each torque pin 81 is inserted into the first hole 4c of the fixed boss 4 and fixed. Also, the projecting 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 main body 81a is cylindrical and protrudes radially outward from the outer peripheral surface of the fixed boss 4 . The pin body 81a is inserted and held in the first hole 4c of the fixed boss 4. As shown in FIG.

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

As shown in FIGS. 5 and 6, each cam groove 5e is formed in a movable boss body 5c of the movable boss 5. As shown in FIGS. 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 biases the movable sheave 2 toward the fixed sheave 1. As shown in FIG. That is, the coil spring 3 biases the movable sheave 2 toward the second side in the axial direction. Thereby, the fixed sheave 1 and the movable sheave 2 sandwich the belt 101 .

Specifically, the coil spring 3 is compressed when the belt 101 is in the inner peripheral position as shown in FIG. Further, as shown in FIG. 4, when the belt 101 is at the outer peripheral 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 , multiple weights 62 and a clutch housing 63 . The centrifugal clutch 6 is configured to transmit or 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.

A drive plate 61 is attached to the third end 4 a of the fixed boss 4 . The drive plate 61 rotates together with the fixed boss 4 . Specifically, the drive plate 61 is a disk-shaped plate having a through hole 61a in the center. The through hole 61 a is shaped to engage with the third end 4 a of the fixed boss 4 . Specifically, the peripheral edge of the through hole 61 a has substantially the same shape as the peripheral edge of the fixed boss 4 .

The movement of the drive plate 61 toward the second side in the axial direction is restricted by abutting against the shoulder portion 4 d of the fixed boss 4 . A nut 64 is screwed onto the third end 4a of the fixed boss 4 on the first axial side of the drive plate 61 . The nut 64 also restricts the axial movement of the drive plate 61 toward the first side.

Each weight 62 is pivotally attached to the drive plate 61 at one end in the circumferential direction. 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 radially inward.

The clutch housing 63 is arranged to cover each weight 62 from the outside in the radial direction. The clutch housing 63 is rotatably supported by the fixed boss 4 . Specifically, the clutch housing 63 has a boss portion 63a. A spline hole 63b is formed in the boss portion 63a. An 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 is frictionally engaged with the inner peripheral surface of the clutch housing 63 . Also, when the centrifugal clutch 6 is in the disengaged state, the friction material 65 of each weight 62 is separated 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 rotation of the fixed sheave 1 and the movable sheave 2 to the output shaft. The disconnected state of the centrifugal clutch 6 means a state in which the centrifugal clutch 6 does not transmit the rotation 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 pulley device on the driving 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 pulley device on the driving side.

In the pulley device 100 on the driven side, the width of the groove formed by the fixed sheave 1 and the movable sheave 2 operates opposite to the width of the groove in the pulley device on the driving side. 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 radially inward, the movable sheave 2 moves 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 is widened.

Further, in the pulley device on the drive side, when the width of the groove formed by the fixed sheave and the movable sheave increases, the winding diameter of the belt 101 decreases. That is, the belt 101 moves radially inward in the pulley device on the drive side.

When the belt 101 moves radially inward in the drive-side pulley device, the belt 101 moves radially outward in the driven-side 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 is narrowed.

[Modification]
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 gist of the present invention.

Modification 1
As shown in FIG. 7, the fixed boss 4 may further have 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 was exemplified as the quenched part, but the quenched part is not limited to this. For example, the quenched part may be plate-like instead of cylindrical like the fixed boss 4 . Also, the quenched part and the adjacent part do not have to slide relative to each other.

Reference Signs List 1 fixed sheave 2 movable sheave 4 fixed boss 40 outer peripheral surface 41 first region 42 second region 43 hardened portion 44 first recess 45 coating layer 46 fixed boss main body 4c hole 5 movable boss

Claims (4)

a shaft-like part main body;
a concave portion formed on the shaft-like part main body;
a hardened portion formed in the recess;
a hole formed in the recess;
with
The shaft-shaped part main body is cylindrical,
The recess is formed on the outer surface of the shaft-like part main body,
The hardened portion is not formed in a portion exceeding 5 mm from the end of the recess,
Hardened parts.
a shaft-like part main body;
a concave portion formed on the shaft-like part main body;
a hardened portion formed in the recess;
with
The shaft-shaped part main body is cylindrical,
The recess is formed on the outer surface of the shaft-like part main body,
The hardened portion is not formed in a portion exceeding 5 mm from the end of the recess,
The shaft-like part main body has a facing surface arranged to face an adjacent part,
The facing surface has a first region that contacts the adjacent component and a second region that is spaced apart from the adjacent component,
The recess is formed in the second region,
Hardened parts.
further comprising a coating layer covering the shaft-shaped part main body,
The hardened part according to claim 1 or 2 .
a fixed sheave;
a movable sheave axially movable toward and away from the fixed sheave;
a hardened component that is tubular and extends axially from the stationary sheave;
a tubular abutment extending axially from the movable sheave;
with
The hardened parts are
a shaft-like part main body;
a concave portion formed on the shaft-like part main body;
a hardened portion formed in the recess;
has
The shaft-shaped part main body is cylindrical,
The recess is formed on the outer surface of the shaft-like part main body,
The hardened portion is not formed in a portion exceeding 5 mm from the end of the recess,
pulley device.

Images