JP2009208180A - Device of manufacturing pin of power transmission chain, and method of manufacturing pin of power transmission chain - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a device of manufacturing a pin of a power transmission chain, which enhances the flexibility of the shape of a pin end face, and to provide a method of manufacturing the pin of the power transmission chain. <P>SOLUTION: A grinding device 35 is formed of a tool holder 37 and a workpiece holder 38. The tool holder 37 has a central axis &epsi;t, and holds a grinding member 36 for grinding a pair of end faces 34 of a pin manufacturing intermediate body 33. The workpiece holder 38 holds the manufacturing intermediate body 33 while aligning a longitudinal direction of the manufacturing intermediate body 33 with the central axis &epsi;t of the tool holder 38. Thus by rotating the workpiece holder 38 and the tool holder 37 about the central axis &epsi;t of the tool holder 37, the pairing end faces 34 of the manufacturing intermediate body 33 are ground. <P>COPYRIGHT: (C)2009,JPO&amp;INPIT

Description

  The present invention relates to a power transmission chain pin manufacturing apparatus and a power transmission chain pin manufacturing method.

For example, an endless power transmission chain used for a power transmission device such as an automobile pulley-type continuously variable transmission (CVT) is formed by connecting a plurality of link plates with pins. The pin has an elongated rod shape, and a pair of end faces come into contact with the pulley. The end surface of this pin is ground using, for example, a grinding device (see, for example, Patent Document 1).
International Publication WO2006 / 43605 A1 Pamphlet

  The grinding device of Patent Document 1 includes a disk-shaped carrier that holds a pin and a disk-shaped grindstone. The center axis of the carrier and the center axis of the grindstone are arranged away from each other in the radial direction of the carrier (grindstone), and both the carrier and the grindstone grind the end face of the pin while rotating around the center axis of the carrier. . At this time, the end surfaces of the pins are ground by the grinding surfaces provided on both side walls of the circumferential groove on the outer periphery of the grindstone.

However, even if an attempt is made to bring the center axis of the carrier closer to the pin in order to make the shape of the end surface of the pin desired, there is a limit to making the carrier center axis closer to the pin due to restrictions on the arrangement of the carrier. . As a result, it is difficult to increase the degree of freedom of the end face shape of the pin.
The present invention has been made under such a background, and an object thereof is to provide a pin manufacturing apparatus and a power transmission chain pin manufacturing method capable of increasing the degree of freedom of the end face shape of the pin. .

  In order to achieve the above object, the present invention provides a grinding member for grinding each of a pair of end faces (34) of an intermediate (33) for producing a pin (3; 3G) having a central axis (εt). (36) and a work holder (38; 37F) for holding the manufacturing intermediate in a state where the longitudinal direction of the manufacturing intermediate is aligned with the central axis of the tool holder. 38B; 38F), and the work holder and the tool holder are rotated relative to each other around the center axis of the tool holder so that the pair of end faces of each manufacturing intermediate is ground. An apparatus (35; 35A; 35B) for producing a pin of the power transmission chain (1) is provided.

  According to the present invention, the center of relative rotation of the tool holder with respect to the work holder is matched with the center of relative rotation of the work holder with respect to the tool holder. As a result, the manufacturing intermediate can be disposed close to the center of these relative rotations. The degree of freedom of arrangement of the manufacturing intermediate in the work holder can be increased, and as a result, the degree of freedom of the shape of the end surface of the manufacturing intermediate ground by the grinding member, that is, the shape of the end surface of the pin can be increased.

In the present invention, the work holder may hold a plurality of manufacturing intermediates arranged radially around the central axis of the tool holder (claim 2). In this case, a plurality of production intermediates can be collectively ground by the grinding member.
In the present invention, the work holder has a center axis (εw) along the center axis of the tool holder, and the center axis of the work holder is arranged offset from the center axis of the tool holder. The work holder holds a plurality of manufacturing intermediates arranged radially around the central axis of the work holder, and the central axis of the tool holder is a virtual cylindrical surface (κ) centered on the central axis of the work holder There is a case where it is arranged above (claim 3).

In this case, the grinding member can be sequentially opposed to the plurality of manufacturing intermediates by relatively moving the tool holder along the circumferential direction of the cylindrical surface. Thereby, the some intermediate body for manufacture can be ground with a grinding member sequentially.
In the present invention, the work holder is opened outward in the radial direction of the work holder, and the housing groove (80) in which the intermediate part (79) in the longitudinal direction of the production intermediate body is accommodated, and the production intermediate And a pressing member (81) that presses the intermediate part of the body against the inner surface (82) of the receiving groove (claim 4). In this case, the manufacturing intermediate can be attached to the work holder by a simple operation of fitting the manufacturing intermediate into the housing groove from the outside in the radial direction of the work holder.

In the present invention, the tool holder includes a shaft portion (48; 48A) or an insertion hole (40F) centered on the center axis of the tool holder, and the work holder is inserted through the shaft portion. A shaft portion (48F) that fits into the hole (40; 40B) or the insertion hole of the tool holder may be included (Claim 5).
In this case, the positioning between the tool holder and the work holder can be accurately performed with a simple operation of fitting the shaft portion into the insertion hole.

  Further, in the present invention, a tool holder having a central axis and holding a grinding member for grinding each of the pair of end faces of the pin manufacturing intermediate, and the longitudinal direction of the manufacturing intermediate in the tool holder A pair of end faces of the production intermediate may be ground by relatively rotating the work holder holding the production intermediate in the state along the central axis around the central axis of the tool holder ( Claim 6).

  In this case, the center of relative rotation of the tool holder with respect to the work holder and the center of relative rotation of the work holder with respect to the tool holder are made to coincide with each other. As a result, the manufacturing intermediate can be disposed close to the center of these relative rotations. The degree of freedom of arrangement of the manufacturing intermediate in the work holder can be increased, and as a result, the degree of freedom of the shape of the end surface of the manufacturing intermediate ground by the grinding member, that is, the shape of the end surface of the pin can be increased.

  In the above description, numbers in parentheses represent reference numerals of corresponding components in the embodiments described later, but the scope of the claims is not limited by these reference numerals.

Preferred embodiments of the present invention will be described with reference to the accompanying drawings.
FIG. 1 schematically shows a main configuration of a chain-type continuously variable transmission (hereinafter also simply referred to as a continuously variable transmission) as a power transmission device including a power transmission chain according to an embodiment of the present invention. It is a perspective view. Referring to FIG. 1, a continuously variable transmission 100 is mounted on a vehicle such as an automobile, and includes a drive pulley 60 made of metal (such as structural steel) as a first pulley, and a second pulley. And a driven pulley 70 made of metal (such as structural steel) and an endless power transmission chain 1 (hereinafter also simply referred to as a chain) wound between the pulleys 60 and 70. . In addition, the chain 1 in FIG. 1 has shown a partial cross section for easy understanding.

  FIG. 2 is a partially enlarged sectional view of the drive pulley 60 (driven pulley 70) and the chain 1 of FIG. Referring to FIGS. 1 and 2, drive pulley 60 is attached to input shaft 61 connected to a drive source of a vehicle so as to be capable of transmitting power, and includes a fixed sheave 62 and a movable sheave 63. Yes. The fixed sheave 62 and the movable sheave 63 have a pair of sheave surfaces 62a and 63a that face each other. Each sheave surface 62a, 63a includes a conical inclined surface.

  Each sheave surface 62a, 63a is inclined with respect to a plane B1 orthogonal to the central axis A1 of the drive pulley 60, and a pulley half angle C as an angle formed between the generatrix of each sheave surface 62a, 63a and the plane B1 is For example, the angle is set to 11 °. A groove is defined between the sheave surfaces 62a and 63a, and the chain 1 is held between the grooves 1 with a strong pressure.

  Further, a hydraulic actuator (not shown) for changing the groove width is connected to the movable sheave 63, and the movable sheave 63 is moved in the axial direction of the input shaft 61 (left-right direction in FIG. 2) at the time of shifting. By doing so, the groove width is changed. Accordingly, the effective radius of the pulley 60 with respect to the chain 1 can be changed by moving the chain 1 in the radial direction of the input shaft 61 (vertical direction in FIG. 2).

On the other hand, as shown in FIGS. 1 and 2, the driven pulley 70 is attached to an output shaft 71 that is connected to a drive wheel (not shown) so as to be able to transmit power. A fixed sheave 73 and a movable sheave 72 each having a pair of opposed sheave surfaces 73a and 72a for forming a groove for sandwiching the chain 1 with high pressure are provided.
Each sheave surface 73a, 72a is inclined with respect to a plane B2 orthogonal to the central axis A2 of the driven pulley 70, and the pulley half angle C as an angle formed between the generatrix of each sheave surface 73a, 72a and the plane B2 is For example, the angle is set to 11 °. The pulley half angle C of the drive pulley 60 and the pulley half angle C of the driven pulley 70 are equal.

A hydraulic actuator (not shown) is connected to the movable sheave 72 of the driven pulley 70 in the same manner as the movable sheave 63 of the drive pulley 60, and the groove width is changed by moving the movable sheave 72 during shifting. It is like that. Accordingly, the effective radius of the pulley 70 with respect to the chain 1 can be changed by moving the chain 1.
FIG. 3 is a cross-sectional view of the main part of the chain 1. FIG. 4 is a longitudinal sectional view of the main part of the linear region of the chain 1. FIG. 5 is a side view of the main part of the bent region of the chain 1.

In the following, when the description is made with reference to FIG. 4, the linear region of the chain 1 will be described with reference to the state viewed from the chain width direction W. In the description with reference to FIG. 5, the bending region of the chain 1 will be described with reference to the state viewed from the chain width direction W.
Referring to FIGS. 3 and 4, chain 1 includes a plurality of links 2 and a plurality of connecting members 50 that connect these links 2 so that they can be bent.

Hereinafter, a direction parallel to the traveling direction of the chain 1 is referred to as a chain traveling direction X, and a direction parallel to the longitudinal direction of the connecting member 50 among the directions orthogonal to the chain traveling direction X is referred to as a chain width direction W. A direction orthogonal to both the direction X and the chain width direction W is referred to as an orthogonal direction V.
One V1 in the orthogonal direction V is a direction facing the outside in the chain radial direction when the chain 1 is bent, and the other V2 in the orthogonal direction V is a chain radial direction when the chain 1 is bent. It is the direction facing the inside.

  Each link 2 is a steel plate member formed in a plate shape, and includes a front end portion 5 and a rear end portion 6 as a pair of end portions arranged in the front-rear direction of the chain traveling direction X. The front end portion 5 and the rear end portion 6 are respectively formed with a front through hole 9 as a first through hole and a rear through hole 10 as a second through hole. The links 2 are aligned in the chain traveling direction X and aligned in the chain width direction W.

  The links 2 adjacent to each other in the chain traveling direction X include a front through-hole 9 of the link 2 relatively on the rear side in the chain traveling direction X and a rear penetration of the link 2 relatively on the front side in the chain traveling direction X. The holes 10 correspond to each other in the chain width direction W. The links 2 adjacent to each other in the chain traveling direction X are connected so as to be bendable by the connecting members 50 inserted through the corresponding through-holes 9 and 10, and the endless chain 1 is formed as a whole.

Each connecting member 50 includes a first pin 3 and a second pin 4 as a power transmission member, and the first and second pins 3 and 4 form a pair.
The paired first and second pins 3 and 4 are configured to come into rolling contact with each other as the corresponding links 2 are bent. Rolling sliding contact refers to contact including at least one of rolling contact and sliding contact.

The first pin 3 is a long member extending in the chain width direction W. The length with respect to the chain traveling direction X is, for example, about 2.5 mm to 4.0 mm, and the length with respect to the orthogonal direction V is, for example, 5.5 mm to It is about 8.0 mm.
The peripheral surface 11 of the first pin 3 is formed as a smooth surface extending in parallel with the chain width direction W, and includes a front portion 12 as a facing portion facing forward in the chain traveling direction X, and a chain traveling direction X. It has a rear portion 13 facing rearward, and one end portion 14 and the other end portion 15 as a pair of end portions facing each other in the orthogonal direction V.

  The front portion 12 faces the paired second pins 4 and comes into rolling contact with a rear portion 19 (to be described later) of the second pins 4 at a contact portion T (contact point as viewed from the chain width direction W). ing. The rear portion 13 is a flat surface. This flat surface has a predetermined angle of attack E with respect to a plane D orthogonal to the chain traveling direction X. The angle of attack E is set to a small value, for example, about 5 ° to 12 °. The rear portion 13 is inclined along an inclination direction F inclined with respect to the chain traveling direction X when the chain linear region is viewed from the chain width direction W, and faces the other V2 side in the orthogonal direction V. . The angle formed by the inclination direction F and the orthogonal direction V is the angle of attack E.

Referring to FIGS. 2 and 4, one end portion 14 constitutes an end portion on one V1 side in the orthogonal direction V corresponding to the outer side in the radial direction of the pulleys 60 and 70 on the peripheral surface 11. The other end portion 15 constitutes an end portion on the other V2 side in the orthogonal direction V corresponding to the inside of the circumferential surface 11 in the radial direction of the pulleys 60 and 70.
The pair of end portions 16 in the longitudinal direction of the first pin 3 protrudes outward in the chain width direction W with respect to the links 2 arranged at the pair of end portions in the chain width direction W among the links 2. Yes. An end face 17 is provided on each of the pair of end portions 16. Each end surface 17 is convexly curved toward the outside in the chain width direction W.

One end 14 of the peripheral surface 11 of the first pin 3 is formed wider in the chain width direction W than the other end 15. The contact region 20 formed on the pair of end surfaces 17 comes into frictional contact (engagement) with the corresponding sheave surfaces 62a, 63a, 72a, 73a of the pulleys 60, 70 via a thin film of lubricating oil film. Yes.
The first pin 3 is sandwiched between the corresponding sheave surfaces 62a, 63a, 72a, 73a, whereby power is transmitted between the first pin 3 and the pulleys 60, 70. Since the end surface 17 of the first pin 3 directly contributes to power transmission, the first pin 3 is formed of a material having high strength and excellent wear resistance such as bearing steel (SUJ2).

3 and 4, the second pin 4 (also referred to as a strip or an interpiece) is a long member extending in the chain width direction W and formed of the same material as that of the first pin 3. It is.
The second pin 4 is formed shorter than the first pin 3 so that the pair of end portions do not contact the sheave surfaces of the pulleys, and with respect to the first pin 3 that makes a pair, It is arranged in front of the chain traveling direction X.

The peripheral surface 18 of the second pin 4 is a smooth surface extending in parallel with the chain width direction W, and has a rear portion 19 as a facing portion facing rearward in the chain traveling direction X. The rear part 19 has an intermediate part in the orthogonal direction V formed on a flat surface orthogonal to the chain traveling direction X, and faces the front part 12 of the paired first pins 3.
The chain 1 is a so-called press-fit type chain. Specifically, the corresponding first pin 3 is loosely fitted in the front through hole 9 of each link 2, and the corresponding second pin 4 is press-fitted and fixed, and the rear through hole of each link 2. 10, the corresponding first pin 3 is press-fitted and fixed, and the corresponding second pin 4 is loosely fitted.

With the above configuration, the rear portion 19 of the second pin 4 paired with the front portion 12 of the first pin 3 is on the contact portion T that moves in accordance with the bending between the links 2 adjacent to each other in the chain traveling direction X. Thus, they are in rolling contact with each other. Each of the first and second pins 3 and 4 may be loosely fitted in the corresponding front through hole 9 and rear through hole 10.
The front portion 12 has a curved shape protruding forward in the chain traveling direction X. Specifically, the cross-sectional shape of a portion of the front portion 12 on the one V1 side in the direction V orthogonal to the contact portion T1 in the linear region of the chain 1 includes an involute curve. Moreover, the cross-sectional shape of the part which exists in the other side V2 of the orthogonal | vertical direction V with respect to the contact part T1 in the linear area | region of the chain 1 among the front parts 12 is made into the smooth curve line.

Referring to FIG. 5, when viewed from the chain width direction W, the movement trajectory of the contact portion T accompanying the bending between the corresponding links 2 becomes an involute curve with the first pin 3 as a reference.
Thereby, when the adjacent links 2 are bent, the corresponding first and second pins 3 and 4 can smoothly roll and come into contact with each other, and the smooth bending of the links 2 can be achieved. As a result, the string vibration of the chain 1 can be suppressed.

One side F <b> 1 of the tilt direction F is a direction facing the outside of the bend in the bending region of the chain 1, and the other side F <b> 2 of the tilt direction F is a direction facing the inside of the bend in the bending region of the chain 1.
6A is a side view of the first pin 3 viewed from an oblique direction orthogonal to an inclined plane inclined by a pulley half angle with respect to a plane orthogonal to the chain width direction W. FIG. ) Is a cross-sectional view taken along line VIB-VIB in FIG. 6A, and FIG. 6C is a cross-sectional view taken along line VIC-VIC in FIG.

6B, the oblique direction J perpendicular to the inclined plane H inclined by the pulley half angle C with respect to the plane G perpendicular to the chain width direction W is illustrated. When the description will be made with reference to FIG. 6A, the description will be based on the state in which the first pin 3 is viewed from the oblique direction J.
With reference to FIG. 6A, the contact area 20 of the first pin 3 is arranged avoiding the outer peripheral edge 21 of the end surface 17 of the first pin 3. When the contact region 20 is viewed along the oblique direction J, the contact region 20 has an oval shape that is vertically long in the inclined direction F. The longitudinal direction K of the contact region 20 is along the inclination direction F, and the short side direction L is orthogonal to the inclination direction F.

The contact area 20 has a contact center point 22 as a centroid when the contact area 20 is viewed along the oblique direction J. The contact region 20 contacts the sheave surface of the pulley around the contact center point 22. The contact region 20 is formed to be relatively short on one side F <b> 1 in the tilt direction F and relatively long on the other side F <b> 2 in the tilt direction F with reference to the contact center point 22.
The contact center point 22 coincides with the vertex of the end surface 17 of the first pin 3. The contact center point 22 may not coincide with the vertex of the end surface 17 of the first pin 3. For example, a first curved portion 29 described later may be disposed at the apex of the end surface 17 of the first pin 3.

  The contact region 20 is centered on a reference plane P1 including a contact center point 22 at an angle of attack E as an angle (including zero) of 30 ° or less with respect to a plane D orthogonal to the chain traveling direction X. It has a symmetrical shape. Note that it is not realistic to make the angle of attack E larger than 30 ° because of the layout of the first pins 3. Preferably, the angle of attack E is set to 20 ° or less.

The reference plane P1 extends in the longitudinal direction K of the contact area 20. The long axis 23 of the contact area 20 extends on the reference plane P1. The short axis 24 of the contact region 20 intersects the long axis 23 at the contact center point 22 and is orthogonal to the long axis 23.
The contact region 20 includes first and second end portions 25 and 26 with respect to the longitudinal direction K and a widest maximum width portion 27 with respect to the lateral direction L.

The first end portion 25 is an end portion on one side in the longitudinal direction K in the contact region 20, and is close to the one end portion 14 of the peripheral surface 11 of the first pin 3. The second end portion 26 is an end portion on the other side in the longitudinal direction K in the contact region 20, and is close to the other end portion 15 of the peripheral surface 11.
The first and second end portions 25 and 26 are respectively disposed on the reference plane P1. The center of the maximum width portion 27 is the contact center point 22. The first end portion 25, the maximum width portion 27, and the second end portion 26 are aligned on the long axis 23.

When viewed along the oblique direction J, with respect to the inclination direction F, the contact center point 22 and the first end portion 25 are separated by a relatively close distance N2, and the contact center point 22 and the second end portion are separated. 26 is separated by a relatively far distance N3.
The distance L2 may be a relatively long distance, and the distance L3 may be a relatively close distance.

The reference plane P1 includes a reference axis M that extends in the chain width direction W. The reference axis M is arranged with respect to the first pin 3 on the outer side of the bending in the bending region of the chain 1, that is, on the one side F <b> 1 in the inclination direction F. A distance N1 between the contact center point 22 and the reference axis M with respect to the inclination direction F is, for example, about 6 mm.
With reference to FIGS. 6A and 6B, a predetermined intersection line 31 is formed by the intersection of an arbitrary plane P including the reference axis M and the contact region 20. In FIG. 6B, as an example, a reference plane P1 as a plane P including the reference axis M and passing through the contact center point 22 and a predetermined intersection line 31 due to the intersection of the contact area 20 are illustrated. .

The predetermined intersection line 31 includes a connecting portion 28 and first and second curved portions 29 and 30 that are continuous with each other via the connecting portion 28.
The connecting portion 28 is a boundary portion between the first and second curved portions 29 and 30 and is disposed on the cylindrical surface Q with the reference axis M as the center. In other words, as shown in FIGS. 6A and 6C, the connecting portion 28 is an intersection formed by the intersection of the cylindrical surface Q and the contact region 20. In the present embodiment, connection portion 28 is formed by the intersection of cylindrical surface Q <b> 1 including contact center point 22 and contact region 20. On the cylindrical surface Q <b> 1, the connecting portion 28 has an arc shape having a predetermined radius of curvature R and includes a contact center point 22.

Referring to FIGS. 6A and 6B, on the predetermined intersection line 31, the first curved portion 29 is disposed on the other V2 side in the orthogonal direction V with respect to the connection portion 28. The second curved portion 30 is disposed on the one V1 side in the orthogonal direction V with respect to the connecting portion 28.
In other words, in the bending region of the chain 1, the first curved portion 29 is disposed relatively inside the bend, and the second curved portion 30 is disposed relatively outside the bend.

  An end 30a on the one V1 side in the orthogonal direction V of the second curved portion 30 is an end of one V1 in the orthogonal direction V of the first intersecting line 31 and is connected to the outer peripheral edge 32 of the contact region 20. Has been. An end 30 b on the other V 2 side in the orthogonal direction V of the second curved portion 30 is connected to the connection portion 28. Of the first curved portion 29, the end portion 29 a on the one V 1 side in the orthogonal direction V is connected to the connecting portion 28. Of the first curved portion 29, the end portion 29 b on the other V2 side in the orthogonal direction V is connected to the outer peripheral edge portion 32 of the contact region 20.

As described above, the corresponding end portions 29 a and 30 b of the first curved portion 29 and the second curved portion 30 are connected continuously and smoothly via the connecting portion 28.
The first curved portion 29 has an arc shape having a single radius of curvature RL. The second curved portion 30 has an arc shape having a single radius of curvature RU. These curvature radii RL and RU are set to different values. Specifically, the curvature radius RL is a relatively large value, and the curvature radius RU is a relatively small value. For example, in the present embodiment, the curvature radius RL is set to approximately 180 mm, and the curvature radius RU is set to approximately 60 mm.

  On an arbitrary plane P, the curvature center point U1 of the first curved portion 29 and the curvature center point U2 of the second curved portion 30 are arranged on a common normal α. The normal α is a normal to the tangent β of the contact region 20 in the connection portion 28 on an arbitrary plane P. On the above-mentioned arbitrary plane P, this normal α intersects a straight line γ extending along the chain width direction W and intersecting the connecting portion 28 at an angle C ′ equal to the pulley half angle C.

The tangent of the first curved portion 29 at the end 29a (connecting portion 28) of the first curved portion 29 and the second curved portion 30 at the end 30b (connecting portion 28) of the second curved portion 30. And the tangent line of each coincide with the tangent line β. In other words, in the connection portion 28, the first and second curved portions 29 and 30 share the tangent line β.
An intersecting line δ between the arbitrary inclined plane H and the end surface 17 coincides with the outer peripheral edge portion 32 of the contact region 20 or a shape similar to the outer peripheral edge portion 32. In FIG. 6A, an intersection line δ that coincides with the outer peripheral edge 32 is illustrated. As described above, since the angle C ′ equal to the pulley half angle C is a small value of about 11 °, it is viewed along the cross line δ when viewed along the chain width direction W and along the oblique direction J. The intersecting line δ at the time has substantially the same shape.

The above is the schematic configuration of the continuously variable transmission. Next, a method for forming the end face 17 of the first pin 3 of the chain 1 will be described.
FIG. 7A is a cross-sectional view illustrating a schematic configuration of a grinding device 35 for grinding each of the pair of end surfaces 34 of the intermediate body 33 for manufacturing the first pin 3. FIG. 7B is a cross-sectional view taken along line VIIB-VIIB in FIG.

7A and 7B, the grinding device 35 is used as a manufacturing device for the first pin 3 of the chain 1, and includes a pair of end surfaces 34 of the manufacturing intermediate 33, The first pins 3 are formed by grinding each of 34.
The manufacturing intermediate 33 is, for example, a long member formed in an outer shape substantially equal to the first pin 3, and the pair of end surfaces 34 and 34 are in a state before being subjected to finishing grinding. It has become. This production intermediate 33 may be a material that has been subjected to a heat treatment such as quenching and tempering, or may be a material that has not been subjected to a heat treatment.

The grinding device 35 holds a grinding member 36 for grinding each of the pair of end surfaces 34, 34 of the manufacturing intermediate 33, a tool holder 37 that holds the grinding member 36, and a plurality of manufacturing intermediates 33. And a work holder 38.
The work holder 38 holds the manufacturing intermediate 33 in a state where the longitudinal direction of the manufacturing intermediate 33 is aligned with the central axis εt of the tool holder 37. The work holder 38 includes a main body 39 having the central axis εw of the work holder 38 as a central axis. The main body 39 includes a shaft portion insertion hole 40 into which a shaft portion 48 described later of the tool holder 37 is inserted (fitted), and a plurality of radial portions around the shaft portion insertion hole 40 (center axis εt of the tool holder 37). Intermediate body holding holes 41 that are arranged and hold a plurality of production intermediate bodies 33 are formed. The distance from the central axis εw of the work holder 38 to the central axis εi of the intermediate body holding hole 41 is set to a predetermined value N1. That is, it is equal to the distance N1 between the reference axis M and the contact center point 22 with respect to the inclination direction F.

The shaft portion insertion hole 40 is formed around the central axis εw of the work holder 38 and passes through the main body 39 of the work holder 38.
The center axis εi of each intermediate body holding hole 41 is parallel to the center axis εw of the work holder 38. Each intermediate body holding hole 41 passes through the main body 39 of the work holder 38.
These intermediate body holding holes 41 are arranged at equal intervals in the circumferential direction of the main body 39. The inner peripheral surface of each intermediate body holding hole 41 is formed in a shape that substantially matches the shape of the outer peripheral surface of the manufacturing intermediate body 33.

  The intermediate body for manufacturing 33 is inserted into each intermediate body holding hole 41, and the intermediate portion 79 in the longitudinal direction of the intermediate body for manufacturing 33 is held so as not to move with respect to the corresponding intermediate body holding hole 41. . As a result, the plurality of manufacturing intermediate bodies 33 are held in a radial arrangement around the central axis εt of the tool holder 37 in a state where the longitudinal direction thereof is along the central axis εt of the tool holder 37.

  The pair of end portions of the manufacturing intermediate 33 protrude from the main body 39 of the work holder 38. The manufacturing intermediate body 33 held in the intermediate body holding hole 41 has one end portion 42 corresponding to the one end portion 14 of the first pin 3 facing the central axis εw of the work holder 38, and The other end portion 43 corresponding to the other end portion 15 faces the central axis εw of the work holder 38 with the one end portion 42 interposed therebetween.

The main body 39 of the work holder 38 is restricted from rotating around the central axis εw of the work holder 38 by using the fixing member 44 and the key 69. Specifically, a key 69 is fitted between a recess formed on the outer surface of the fixing member 44 and a recess formed on the outer peripheral surface of the main body 39 of the work holder 38.
The tool holder 37 is rotatable around its central axis εt, and includes first and second side portions 45 and 46 arranged with a main body 39 of the work holder 38 interposed therebetween. . The first and second side portions 45 and 46 each have a central axis εt of the tool holder 37 as a central axis. The center axis εt of the tool holder 37 coincides with the center axis εw of the work holder 38.

The first and second side portions 45 and 46 are connected to a power source (not shown) such as an electric motor so as to be able to transmit power, and rotate around the central axis εt of the tool holder 37. It has become.
An annular holding groove 47 for holding the grinding member 36 is formed in each of the first and second side portions 45 and 46. These holding grooves 47 are formed around the central axis εt of the tool holder 37.

  The first side portion 45 is provided with a shaft portion 48 centered on the central axis εt of the tool holder 37. The shaft portion 48 is used for aligning the first and second side portions 45 and 46 of the tool holder 37 with each other and aligning the tool holder 37 and the main portion 39 of the work holder 38 with each other. . The shaft portion 48 is inserted through the shaft portion insertion hole 40 of the main body portion 39 of the work holder 38, and is rotatable relative to the main body portion 39 and relatively movable in the axial direction of the tool holder 37. In addition, the shaft portion 48 is inserted into the second side portion 46 of the tool holder 37 through a shaft portion insertion hole 40 formed around the central axis εt of the tool holder 37, and the second side portion 46. The tool holder 37 is connected to the tool holder 37 so as to be able to rotate and move relative to the axial direction of the tool holder 37.

The grinding member 36 includes a first grindstone 58 for grinding one end face 34 of the production intermediate 33 and a second grindstone 59 for grinding the other end face 34 of the production intermediate 33. It is out.
The first and second grindstones 58 and 59 are each formed in an annular shape. The first and second grindstones 58 and 59 are fitted and fixed in the corresponding holding grooves 47 of the tool holder 37.

  The first and second grindstones 58 and 59 include abrasive surfaces 54 and 55, respectively. These abrasive surfaces 54 and 55 are symmetrical with respect to the axial direction of the tool holder 37. The grinding surface 54 of the first grindstone 58 is disposed to face one end surface 34 of the production intermediate 33, and the grinding surface 55 of the second grinding stone 59 is arranged to face the other end surface 34 of the production intermediate 33. Has been. Each of the abrasive surfaces 54 and 55 has an annular shape centered on the central axis εt of the tool holder 37.

For example, when the tool holder 37 is rotating, the rotation direction of the tool holder 37 is set so that the rear portion 56 of the manufacturing intermediate 33 corresponding to the rear portion 13 of the first pin 3 is changed to the intermediate holding hole of the work holder 38. It sets so that the force which presses on the internal peripheral surface of 41 may act. For example, in this embodiment, the direction is indicated by an arrow ζ in FIG.
FIG. 8 is an enlarged view of a main part of FIG. As described above, the grinding surface 54 of the first grinding wheel 58 and the grinding surface 55 of the second grinding stone 59 are symmetrical with respect to the axial direction of the tool holder 37. The grinding surface 54 of the first grindstone 58 will be mainly described.

  With reference to FIGS. 6B and 8, the grinding surface 54 of the first grindstone 58 is an arbitrary plane S including the central axis εt of the tool holder 37 (for example, a plane parallel to the paper surface of FIG. 8). By intersecting, an intersection line 57 is formed on the grinding surface 54. The intersection line 57 includes a shape that substantially matches a predetermined intersection line 31 formed by the contact area 20 of the first pin 3 and the reference plane P1 intersecting each other.

This intersection line 57 is a first curve for forming a connection portion forming portion 64 for forming the connection portion 28 of the contact region 20 of the first pin 3 and a first curved portion 29 of the contact region 20. A part forming part 65 and a second curved part forming part 66 for forming the second curved part 30 of the contact region 20 are included.
In the connecting portion forming portion 64, the distance from the central axis εt of the tool holder 37 with respect to the radial direction η of the abrasive surface 54 is a distance equal to the distance N1, and is a small value of about several mm. The first curved line forming part 65 is arranged outside in the radial direction η with respect to the connection part forming part 64 and has the same curvature radius RL ′ as the curvature radius RL of the first curved part 29. . The second curved portion forming portion 66 is disposed on the inner side in the radial direction η with respect to the connecting portion forming portion 64 and has the same curvature radius RU ′ as the curvature radius RU of the second curved portion 30. .

One end portion 66 a of the second curved portion forming portion 66 is disposed on the inner side in the radial direction η with respect to the connecting portion forming portion 64, and the other end portion 66 b is connected to the connecting portion forming portion 64. One end portion 65 a of the first curved portion forming portion 65 is connected to the connecting portion forming portion 64, and the other end portion 65 b is disposed outside the connecting portion forming portion 64 in the radial direction η.
In an arbitrary plane S including the central axis εt of the tool holder 37, the curvature center point U1 ′ of the first curve portion forming portion 65 and the curvature center point U2 ′ of the second curve portion forming portion 66 are common. It is arranged on the normal α ′. The normal line α ′ is a normal line to the tangent line β ′ of the intersection line 57 in the connection portion forming unit 64 in the plane S. At the intersection line 57, the normal line α ′ intersects with a straight line γ ′ extending along the chain width direction W and intersecting the connection portion forming portion 64 at an angle C ′ equal to the pulley half angle C. .

  In the plane S, the tangent line of the second curved portion forming portion 66 at the other end portion 66b (connecting portion 28) of the second curved portion forming portion 66 and one end portion 65a (connecting) of the first curved portion forming portion 65 are connected. The tangent of the first curve portion forming portion 65 in the portion 28) coincides with the tangent β ′. In other words, in the connection part 28, the 1st and 2nd curve part formation parts 65 and 66 share a tangent.

  7A and 7B, in the grinding apparatus 35 having the above-described configuration, the tool holder 37 and the work holder 38 are rotated by the tool holder 37 rotating around its central axis εt. The tool holder 37 is rotated around the center axis εt. As a result, the respective abrasive surfaces 54 and 55 rotate around the central axis εt of the tool holder 37 with respect to these end surfaces 34 and 34 in a state where they are in contact with the pair of end surfaces 34 and 34 of the manufacturing intermediate 33. And these end surfaces 34 and 34 are ground.

Next, a process of grinding the pair of end surfaces 34 and 34 of the manufacturing intermediate 33 using the grinding device 35 will be described.
First, as shown in FIG. 9A, a work holder 38 whose rotation around the central axis εw is restricted by a fixing member 44 and a key 69 and a plurality of manufacturing intermediate bodies 33 are prepared. The production intermediate body 33 is inserted into each intermediate body holding hole 41 of the work holder 38. Thus, in the state where the longitudinal direction of each manufacturing intermediate 33 is aligned with the central axis εw of the work holder 38 (the central axis εt of the tool holder 37), the manufacturing intermediate 33 is moved to the central axis of the work holder 38. Arrange radially around εw.

Next, as shown in FIG. 9B, the shaft portion 48 of the first side portion 45 of the tool holder 37 is inserted into the shaft portion insertion hole 40 of the main body portion 39 of the work holder 38, and further, FIG. As shown in (C), a part of the tip side of the shaft portion 48 is inserted into the shaft insertion hole 40 of the second side portion 46 of the tool holder 37.
As a result, as shown in FIG. 9D, the grinding surfaces 54 and 55 of the first and second grinding wheels 58 and 59 held by the tool holder 37 are made to correspond to the end surfaces 34, 34 abuts.

  In this state, the first and second side portions 45 and 46 of the tool holder 37 are rotated around the central axis εt by the power source. Thereby, the first and second grindstones 58 and 59 held by the tool holder 37 and the respective production intermediates 33 held by the work holder 38 relatively rotate around the central axis εt of the tool holder 37. . Thereby, each grinding | polishing surface 54 and 55 grinds the corresponding end surfaces 34 and 34 of the intermediate body 33 for manufacture. The manufacturing intermediate body 33 subjected to this grinding process becomes the first pin 3.

  As described above, according to the present embodiment, the predetermined intersection line 31 having the plurality of curvature radii RL and RU is formed with respect to the first pin 3, and as a result, the contact region 20 is curved. A portion with a small degree (a portion located on one V1 side in the orthogonal direction V with respect to the connecting portion 28) and a portion with a large degree of bending (a portion located on the other V2 side in the orthogonal direction V with respect to the connecting portion 28) Part) can be provided.

  As a result, the contact area with the pulleys 60 and 70 can be reduced in a portion with a large degree of curvature, so that the area sliding relative to the pulleys 60 and 70 can be reduced, and transmission efficiency can be increased through reduction of slip loss. . Moreover, in the part with a small degree of curvature, it can contact with each pulley 60 and 70 with sufficient contact area, and can reduce the surface pressure with these pulleys 60 and 70. As a result, it is possible to prevent the pulleys 60 and 70 from coming into contact with the outer peripheral edge (edge) of the end face 17 of the first pin 3.

By preventing edge contact, wear of the outer peripheral edge portion of the end surface 17 of the first pin 3 can be suppressed, and practical durability can be further improved. In addition, it is possible to suppress noise due to edge contact and reduce noise.
Further, in the bending region of the chain 1, the reference axis M is disposed outside the bending with respect to the first pin 3. Thereby, it is possible to easily form the contact region 20 of the end face 17 of the first pin 3.

  Specifically, when the contact region 20 is formed by the grinding device 35, the manufacturing intermediate body 33 is held by the work holder 38 having the central axis εw coinciding with the reference axis M, and the workpiece is moved around the central axis εw. In a state where the holder 38 is rotated, the manufacturing intermediate body 33 is passed between a pair of abrasive surfaces 54 and 55 having a generally cross-sectionally C-shaped cross section, whereby a pair of end surfaces 34 and 34 of the manufacturing intermediate body 33 are passed. Can be ground by the corresponding abrasive surfaces 54 and 55 respectively to form the contact region 20.

Further, with respect to the first pin 3, the connecting portion 28 is disposed on the cylindrical surface Q with the reference axis M as the center. Thus, as a result of the connecting portion 28 continuously extending smoothly on the cylindrical surface Q, the contact region 20 is engaged when the sheave surfaces 62a, 63a, 72a, 73a of the pulleys 60, 70 are engaged. Can be made more smooth.
Further, with respect to the first pin 3, a contact center point 22 of the contact region 20 is provided in the connection portion 28. As a result, the first and second curved portions 29 and 30 can be arranged across the contact center point 22, and the portion constituting the first curved portion 29 in the contact area 20 and the first in the contact area 20. The portions constituting the second curved portion 30 can be engaged with the corresponding sheave surfaces 62a, 63a, 72a, 73a of the pulleys 60, 70 in a balanced manner.

  Further, the first pin 3 extends in the chain width direction W when the first pin 3 engages with the corresponding pulley 60 or 70 or when the engagement with the corresponding pulley 60 or 70 is released. Although a tilting motion that rotates about the axis may occur, according to the present embodiment, the first and second curved portions 29 and 30 share the tangent β at the contact center point 22, resulting in the first Even if this tilt motion occurs in one pin 3, the distance between the contact center point 22 in the radial direction of each pulley 60, 70 and the central axis A1, A2 of the corresponding pulley 60, 70 can be prevented from changing. . Thereby, even if a tilt motion occurs in the first pin 3, it is possible to suppress the contact region 20 from slipping (squeezing) with respect to the sheave surfaces 62a, 63a, 72a, 73a of the pulleys 60, 70. Can improve the transmission efficiency and reduce the noise.

Even if the first pin 3 causes the above-described tilt movement in relation to the engagement with the pulleys 60 and 70, the long axis 23 of the contact region 20 corresponds to the central axes A1 and A1 of the corresponding pulleys 60 and 70. It can be made to cross A2. As a result, slip loss can be further reduced and transmission efficiency can be further improved.
Further, in the bent region of the chain 1, the first curved portion 29 is disposed inside the bent with respect to the second curved portion 30, and the curvature radius RL of the first curved portion 29 is the second curved portion 30. It is larger than the radius of curvature RU (RL> RU).

The sheave surfaces 62a, 63a, 72a, 73a of the pulleys 60, 70 have a conical shape. For this reason, when the 1st pin 3 is bit | engaged by each pulley 60 and 70, the part located inside the bending of the chain 1 among the contact areas 20 is the part located outside the bending It is pressed strongly compared to, and a large pressing force acts.
According to the present embodiment, the area of the portion of the contact region 20 that is disposed inside the bend, that is, the portion where the pressing force from the sheave surfaces 62a, 63a, 72a, 73a of the pulleys 60, 70 is strong. Since the area can be increased, the surface pressure acting on the contact region 20 can be further leveled, and the bias of the contact region 20 can be suppressed.

Further, a decrease in the surface pressure accompanying the progress of the contact portion 20 to the outside of the bending with respect to the connection portion 28 and a decrease of the surface pressure accompanying the progress of the connection portion 28 to the inside of the bending are generally reduced. Can be the same. As a result, slip loss with the sheave surfaces 62a, 63a, 72a, 73a of the pulleys 60, 70 can be further reduced, and deterioration of transmission efficiency can be prevented.
As described above, the continuously variable transmission 100 excellent in transmission efficiency, practical durability, and quietness can be realized.

Further, in the grinding device 35, the center of the relative rotation of the tool holder 37 with respect to the work holder 38 and the center of the relative rotation of the work holder 38 with respect to the tool holder 37 are made to coincide with each other on the center axis εt. As a result, the production intermediate 33 can be arranged close to the center of these relative rotations.
For example, when viewed from the oblique direction J, the distance N1 between the contact center point 22 in the inclination direction F and the reference axis M can be shortened to about 50% of the total length of the first pin 3 in the inclination direction F. it can.

Thereby, the freedom degree of arrangement | positioning of the manufacturing intermediate body 33 in the work holder 38 can be made high, As a result, the shape of the end surface 34 of the manufacturing intermediate body 33 ground by the grinding member 36, ie, the 1st pin 3 of FIG. The degree of freedom of the shape of the end face 17 can be increased.
Further, the plurality of production intermediate bodies 33 are held together by the grinding member 36 by holding the plurality of production intermediate bodies 33 radially arranged around the central axis εt of the tool holder 37 by the work holder 38. Can be ground.

In addition, positioning between the tool holder 37 and the work holder 38 can be performed accurately by a simple operation of fitting the shaft portion 48 of the tool holder 37 into the shaft insertion hole 40 of the work holder 38.
Furthermore, it is not necessary to employ a configuration in which the work holder 38 is rotationally driven, and the degree of freedom in layout of the work holder 38 can be increased. Thereby, the work holder 38 can be formed firmly and the rigidity of the support of the manufacturing intermediate body 33 by the work holder 38 can be sufficiently secured.

  In the present embodiment, on the predetermined intersection line 31, curved portions set using a spline function or involute curves generally symmetric in the inclination direction F may be provided on both sides of the connecting portion 28. Good. Further, on the predetermined intersection line 31, another curved portion other than the first and second curved portions 29 and 30 may be provided. Further, the entire end surface 17 of the first pin 3 may be used as the contact region.

  Further, instead of the grinding member 36, other general grinding tools such as an end mill may be used. Further, the shaft portion 48 and the shaft portion insertion hole 40 may be eliminated. When the first and second side portions 45 and 46 of the tool holder 37 are not connected to each other, the abrasive surfaces 54 and 55 of the first and second grindstones 58 and 59 are formed in a drum shape, for example. It may be formed. Further, the first and second grindstones 58 and 59 may not be formed in an annular shape.

  Further, by changing the direction of the inner peripheral surface of the intermediate body holding hole 41 of the main body portion 39 of the work holder 38 by rotating around the central axis εi of the intermediate body holding hole 41, The angle of attack E can be changed. Further, with respect to the work holder 38, the distance from the central axis εw to the central axis εi of the intermediate body holding hole 41 is different between the intermediate body holding holes 41, or the directions of the central axis lines εw and εi are different from each other. By doing so, the position of the contact region 20 on the end face 17 of the first pin 3 can be changed with respect to at least one of the chain traveling direction X and the orthogonal direction V.

  In this way, it is possible to form a plurality of types of first pins 3 having different positions of the contact region 20 on the end face 17 and to randomly arrange the first pins 3 in the chain traveling direction X. In this case, the period of engagement when the first pin 3 is sequentially engaged with each of the pulleys 60 and 70 is randomized, or the amount of tilting motion in which the first pin 3 rotates about its central axis is set to the first. The pins 3 can be made different at random. As a result, the frequency of the driving sound of the chain 1 can be dispersed over a wide range to lower the peak value, and this driving sound can be reduced.

  Further, by rotating the work holder 38 around the central axis εt of the tool holder 37 in a state where the rotation of the tool holder 37 around the central axis εt of the tool holder 37 is restricted, the manufacturing intermediate body 33 is rotated. The pair of end faces 34, 34 may be ground. Further, by rotating both the tool holder 37 and the work holder 38 around the central axis εt of the tool holder 37, the pair of end surfaces 34, 34 of the manufacturing intermediate 33 may be ground.

FIG. 10 is a cross-sectional view of a main part of another embodiment of the present invention. In the following, differences from the embodiment shown in FIGS. 1 to 9 will be mainly described, and the same components are denoted by the same reference numerals and the description thereof will be omitted.
Referring to FIG. 10, in the present embodiment, shaft portions 48A, 48A are provided on first and second side portions 45, 46 of tool holder 37 of grinding device 35A, respectively. Each of these shaft portions 48A, 48A is centered on the central axis εt of the tool holder 37 and protrudes toward the work holder 38 side. Each shaft portion 48A is fitted in the shaft portion insertion hole 40 of the work holder 38 so as to be relatively rotatable and relatively movable in the axial direction.

  FIG. 11 is a cross-sectional view of a main part of still another embodiment of the present invention. Referring to FIG. 11, in the present embodiment, a plurality of work holders 38 are held by work holder holding members 67. The work holder holding member 67 is disposed so as to be spaced apart from both the central axis εt of the tool holder 37 and the central axis εw of the work holder 38, and around these central axes εt and εw extending in parallel. It can be rotated. The work holder holding member 67 rotates around the central axis εh by the output of a power source such as an electric motor (not shown), for example.

A plurality of work holders 38 are fixed to the outer peripheral surface 68 of the work holder holding member 67. In the present embodiment, the work holder holding member 67 and each work holder 38 are integrally formed using a single member. The work holder holding member 67 and each work holder 38 may be formed separately and fixed to each other.
The work holders 38 are arranged at equal intervals in the circumferential direction of the work holder holding member 67. As the work holder holding member 67 rotates about the central axis εh, the work holder 38 sandwiched between the first and second side portions 45 and 46 of the tool holder 37 is sequentially replaced (in FIG. 11). Only the second side 46 is shown).

According to the present embodiment, the work holder 38 sandwiched between the first and second side portions 45 and 46 of the tool holder 37 can be sequentially replaced by a simple operation of rotating the work holder holding member 67. Accordingly, the work holder 38 sandwiched between the first and second side portions 45 and 46 of the tool holder 37 can be quickly replaced.
FIG. 12A is a cross-sectional view of a main part of still another embodiment of the present invention. FIG. 12B is a cross-sectional view of a main part along the line XIIB-XIIB in FIG.

With reference to FIG. 12 (A) and FIG. 12 (B), the grinding device 35B includes a grinding member 36, a tool holder 37, and a work holder 38B.
The center axis εw of the work holder 38B is arranged offset with respect to the center axis εt of the tool holder 37, and the center axes εw and εt are separated from each other in parallel. The work holder 38B includes a main body portion 39B and a support shaft 75 that supports the main body portion 39B.

The support shaft 75 extends around the center axis εw of the work holder 38B, and is connected to a power source (not shown) such as an electric motor so that power can be transmitted. By driving the power source, the support shaft 75 rotates around the central axis εw of the work holder 38B.
The support shaft 75 and the main body 39B are coupled to each other around the central axis εw of the work holder 38 via a key 76 so as to be able to rotate together. Specifically, recesses are formed on each of the outer peripheral surface of the support shaft 75 and the inner peripheral surface of the support shaft insertion hole 77 formed in the main portion 39B and through which the support shaft 75 is inserted. A key 76 is disposed across the keys.

  The main body 39B of the work holder 38B is formed in a disc shape centered on the central axis εw of the work holder 38B, for example. A plurality of receiving grooves 80 for receiving the intermediate portion 79 in the longitudinal direction of the manufacturing intermediate body 33 are formed radially on the outer peripheral surface 78 of the main portion 39B with the central axis εw of the work holder 38 as the center. . These accommodation grooves 80 are arranged at equal intervals over the entire circumference in the circumferential direction of the main body 39B.

Each housing groove 80 is formed by recessing a part of the outer peripheral surface 78 of the main body portion 39B, and is opened outward in the radial direction of the main body portion 39B.
Corresponding to each accommodation groove 80, a pressing member 81 is provided. The pressing member 81 prevents the manufacturing intermediate body 33 from falling out of the housing groove 80 by pressing the intermediate portion 79 of the manufacturing intermediate body 33 accommodated in the housing groove 80 against the inner surface 82 of the housing groove 80. Is for. Each pressing member 81 is formed using, for example, a leaf spring as an elastic member, and is disposed in the vicinity of the corresponding accommodation groove 80. The base end portion of each pressing member 81 is fixed to the main portion 39B using a screw 83 as a fixing member. An intermediate portion of each pressing member 81 is bent, for example, in a U shape, and is given flexibility.

  The front end portion of each pressing member 81 is disposed in the corresponding receiving groove 80 and elastically presses the intermediate portion 79 of the manufacturing intermediate body 33 stored in the receiving groove 80. The front end portion of the pressing member 81 is in contact with a front portion 84 corresponding to the front portion 12 of the first pin 3 in the manufacturing intermediate body 33. Further, the inner surface 82 of the housing groove 80 includes a receiving portion 85 that is in surface contact with the rear portion 56 corresponding to the rear portion 13 of the first pin 3 in the manufacturing intermediate body 33. The receiving portion 85 extends substantially along the radial direction of the main body portion 39B, and restricts the movement of the receiving portion 85 in one of the circumferential directions of the main body portion 39B (counterclockwise direction in FIG. 12B). ing.

The intermediate portion 79 of the manufacturing intermediate 33 is sandwiched between the distal end portion of the pressing member 81 and the receiving portion 85. The bottom portion 86 of the receiving groove 80 receives the other end portion 42 corresponding to the one end portion 14 of the first pin 3 in the manufacturing intermediate body 33.
A shaft portion insertion hole 40B through which the shaft portions 48A and 48A of the tool holder 37 are inserted is formed in the main body portion 39B. The shaft portion insertion holes 40B are provided corresponding to the respective housing grooves 80, and a plurality of shaft portion insertion holes 40B are formed at equal intervals in the circumferential direction of the main body portion 39B. When the shaft portion 48A of the tool holder 37 is inserted into the shaft portion insertion hole 40B, the center axis line εi of the shaft portion insertion hole 40B coincides with the center axis line εt of the tool holder 37.

The central axis εi of each shaft portion insertion hole 40B is disposed on a virtual cylindrical surface κ centered on the central axis εw of the work holder 38B. Thereby, the center axis line of the shaft part 48A when inserted through the shaft part insertion hole 40B, that is, the center axis line εt of the tool holder 37 is arranged on the cylindrical surface κ.
Next, a process of grinding the pair of end faces 34, 34 of the manufacturing intermediate 33 using the grinding device 35B will be described. First, as shown in FIG. 13 (A), the intermediate portion 79 of the manufacturing intermediate 33 is fitted into each receiving groove 80 of the work holder 38B. The intermediate portion 79 of the production intermediate 33 is sandwiched between the inner surface 82 of each housing groove 80 and the tip of the pressing member 81.

  As shown in FIG. 13B, the shaft portions 48A and 48A of the first and second side portions 45 and 46 of the tool holder 37 in a state where the manufacturing intermediate body 33 is held in the respective housing grooves 80. Is inserted into the corresponding shaft portion insertion hole 40B of the work holder 38B and fitted. As a result, as shown in FIG. 13C, the grinding surfaces 54 and 55 of the first and second grinding wheels 58 and 59 abut against the corresponding end surfaces 34 of the corresponding manufacturing intermediates 33.

  In this state, the tool holder 37 is rotated around the central axis εt of the tool holder 37. As a result, the first and second grindstones 58 and 59 are rotated about the central axis εt. The rotation direction at this time is a direction in which the rear portion 56 of the production intermediate 33 is pressed against the receiving portion 85 of the accommodation groove 80, and is, for example, the rotation direction σ in FIG. At this time, the work holder 38B does not rotate. Thereby, each grinding | polishing surface 54 and 55 grinds the corresponding end surfaces 34 and 34 of the intermediate body 33 for manufacture, and the 1st pin 3 is formed.

After grinding of the manufacturing intermediate 33 is completed, as shown in FIG. 13D, the shaft portions 48A and 48A of the first and second side portions 45 and 46 of the tool holder 37 are inserted into the shaft portion insertion holes. Extracted from 40B, the engagement between the tool holder 37 and the work holder 38B is released.
In this state, as shown in FIG. 13E, for example, by rotating the work holder 38B by a predetermined amount around the central axis εw of the work holder 38B, the central axis εt of the tool holder 37 is changed to the work holder 38B. Move on the virtual cylindrical surface κ. Thus, the shaft portion 48A of the tool holder 37 faces another shaft portion insertion hole 40B.

In this state, as shown in FIG. 13 (F), the shaft portions 48A and 48A of the pair of side portions 45 and 46 of the tool holder 37 are again inserted into and fitted into the shaft portion insertion holes 40B. The pair of end faces 34 and 34 of the manufacturing intermediate 33 are ground by the first and second grindstones 58 and 59 held by the tool holder 37 in the same manner as described in the above.
By repeating the steps described with reference to FIGS. 13C to 13F, the pair of end faces 34 and 34 of the plurality of manufacturing intermediate bodies 33 held by the work holder 38B are sequentially ground.

As described above, according to the present embodiment, the tool holder 37 is relatively moved along the circumferential direction of the cylindrical surface κ, whereby the first and second grinding members 36 are sequentially moved to the plurality of manufacturing intermediates 33. The second grindstones 58 and 59 can be opposed to each other. Accordingly, the plurality of production intermediate bodies 33 can be sequentially ground by the grinding member 36.
Further, the manufacturing intermediate body 33 can be attached to the work holder 38B by a simple operation of fitting the manufacturing intermediate body 33 into the receiving groove 80 from the radially outer side of the work holder 38B.

In the present embodiment, as shown in FIG. 14, a shaft portion 48 is provided on the first side portion 45 of the tool holder 37, and this shaft portion 48 is connected to the shaft portion insertion hole 40 </ b> B of the work holder 38 </ b> B and the first portion 45. You may make it penetrate both the axial part penetration holes 40 formed in the 2 side part 46. As shown in FIG.
FIG. 15 is a cross-sectional view of a main part of still another embodiment of the present invention. Referring to FIG. 15, the feature of the present embodiment is that connection portion 28 </ b> C includes straight line portion 87 at predetermined intersection line 31 </ b> C of first pin 3. The straight line portion 87 is formed in parallel with the inclined plane H, for example.

  In the intersection line 31 </ b> C including the contact center point 22, the contact center point 22 is disposed at the center of the straight line portion 87. In the reference plane P1C (in FIG. 15, a plane along the paper surface), the perpendicular λ including the contact center point 22 and orthogonal to the straight line portion 87 is a straight line γ including the contact center point 22 and extending along the chain width direction W. On the other hand, they intersect at an angle C ′ equal to the pulley half angle C.

The other end portion 30bC of the second curved portion 30C is continuously and smoothly connected to the one end portion 87a of the linear portion 87. In the reference plane P1C, the tangent line βC at the other end 30bC (one end 87a) of the second curved portion 30C overlaps with the straight line portion 87.
One end portion 29aC of the first curved portion 29C is continuously and smoothly connected to the other end portion 87b of the linear portion 87. In the reference plane P1C, the tangent line βC at one end portion 29aC (the other end portion 87b) of the first curved portion 29C overlaps with the straight line portion 87.

The end surface 17 of the first pin 3 having this intersection line 31C is formed using a grinding surface having a cross-sectional shape equal to the intersection line formed by intersecting this end surface 17 and the reference plane P1C.
According to the present embodiment, the area around the connection portion 28C can be increased, and the pressing force from the pulleys 60 and 70 acting on the contact region 20 can be dispersed in a wider range.
The present invention is not limited to the above embodiments, and various modifications can be made within the scope of the claims. For example, as shown in FIG. 16, the shape of the contact region 20D viewed along the oblique direction J is the distance N2D from the contact center point 22 to the first end 25D of the contact region 20D with respect to the inclination direction F, and the contact The distance N3D from the center point 22 to the second end portion 26D of the contact area 20D may be substantially the same. This distance N3D is slightly longer than the distance N2D. In this case, the curvature half of the first curve portion on the predetermined intersection line is set to 180 mm, for example, and the curvature radius of the second curve portion on the predetermined intersection line is set to 120 mm, for example.

  As shown in FIG. 17, the shape of the contact region 20E viewed along the oblique direction J is such that the distance N2E from the contact center point 22 to the first end 25E of the contact region 20E is relative to the inclination direction F. The distance N3E from the contact center point 22 to the second end portion 26E of the contact region 20E may be relatively long. In this case, the curvature radius of the first curved portion on the predetermined intersection line is set to 180 mm, for example, and the curvature radius of the second curved portion on the predetermined intersection line is set to 60 mm, for example.

Further, as shown in FIG. 18, the first and second side portions 45F and 46F of the tool holder 37F are provided with shaft portion insertion holes 40F, and the work holder 38F is fitted with the shaft portion insertion holes 40F. 48F may be provided.
Alternatively, the first pin 3G shown in FIGS. 19A and 19B may be applied. A predetermined intersection line 31G is formed by the intersection of an arbitrary plane PG including the reference axis MG of the first pin 3G and the contact region 20G. FIG. 19B is a cross-sectional view of the first pin 3G cut along a reference plane P1G passing through the reference axis MG and the contact center point 22G.

The first curved portion 29G of the predetermined intersection line 31G of the first pin 3G has a single radius of curvature RLG. The second curved portion 30G of the predetermined intersection line 31G has a single radius of curvature RUG. These curvature radii RLG and RUG are set to be equal to each other (for example, 180 mm) (RLG = RUG).
The end surface 17G of the first pin 3G has, for example, the grinding device 35 in a state where RL ′ of the grinding device 35 in FIG. 8 is RLG and RU ′ is RUG (RL ′ = RLG = RU ′ = RUG). Formed using.

Furthermore, the present invention is applied to a so-called block type power transmission chain in which a member having a power transmission portion similar to the end face of the first pin is arranged in the vicinity of each of the pair of end portions of the first pin. May be.
Further, the present invention is not limited to a mode in which the groove widths of both the drive pulley 60 and the driven pulley 70 are changed, and may be a mode in which only one of the groove widths is changed and the other is a fixed width that does not change. good. Furthermore, although the aspect in which the groove width fluctuates continuously (steplessly) has been described above, the groove width may vary stepwise or may be applied to other power transmission devices such as a fixed type (no shift). .

It is a perspective view showing typically the principal part composition of the continuously variable transmission provided with the power transmission chain concerning one embodiment of the present invention. It is a partial expanded sectional view of the drive pulley (driven pulley) and chain of FIG. It is a cross-sectional view of the principal part of a chain. It is a partial longitudinal cross-sectional view of the principal part of the linear area | region of a chain. It is a side view of the principal part of the bending area | region of a chain. FIG. 6A is a side view of the first pin viewed from an oblique direction orthogonal to an inclined plane inclined by a pulley half angle with respect to a plane orthogonal to the chain width direction, and FIG. It is sectional drawing which follows the VIB-VIB line of A), (C) is sectional drawing which follows the VIC-VIC line of FIG. 6 (A). (A) is sectional drawing which shows schematic structure of the grinding apparatus for grinding each of a pair of end surface of the intermediate body for manufacture of a 1st pin, (B) is VIIB- of FIG. 7 (A). It is sectional drawing which follows the VIIB line. It is an enlarged view of the principal part of FIG. (A)-(D) are sectional drawings of the principal part for demonstrating the grinding process of a pair of end surface of the intermediate body for manufacture. It is sectional drawing of the principal part of another embodiment of this invention. It is sectional drawing of the principal part of another embodiment of this invention. (A) is sectional drawing of the principal part of another embodiment of this invention, (B) is sectional drawing of the principal part in alignment with the XIIB-XIIB line | wire of FIG. 12 (A). (A)-(F) are sectional drawings of the principal part for demonstrating the grinding process of a pair of end surface of the intermediate body for manufacture. It is sectional drawing of the principal part of another embodiment of this invention. It is sectional drawing of the principal part of another embodiment of this invention. It is a side view of the principal part of further another embodiment of this invention. It is a side view of the principal part of further another embodiment of this invention. It is sectional drawing of the principal part of another embodiment of this invention. (A) is a side view of the principal part of further another embodiment of this invention, (B) is sectional drawing of the 1st pin cut | disconnected by the reference plane which passes along a reference axis line and a contact center point. .

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Chain, 3, 3G ... 1st pin (pin), 33 ... Manufacturing intermediate body, 34 ... End surface of manufacturing intermediate body, 35, 35A, 35B ... Grinding device (manufacturing device), 36 ... Grinding Member, 37, 37F ... Tool holder, 38, 38B, 38F ... Work holder, 40, 40B ... Shaft part insertion hole, 40F ... (Tool holder) shaft part insertion hole, 48, 48A ... (Tool) Shaft part of holder, 48F ... Shaft part of work holder, 79 ... Intermediate part of manufacturing intermediate body, 80 ... Accommodating groove, 81 ... Pressing member, 82 ... Inner surface of accommodating groove, εt ... ( Center axis of tool holder, εw ... Center axis of work holder, κ ... cylindrical surface.

Claims (6)

A tool holder having a central axis and holding a grinding member for grinding each of the pair of end faces of the pin manufacturing intermediate;
In a state where the longitudinal direction of the production intermediate is aligned with the central axis of the tool holder, the work holder holding the production intermediate,
Manufacture of a pin of a power transmission chain, wherein the work holder and the tool holder are rotated relative to each other about the central axis of the tool holder so that a pair of end faces of each manufacturing intermediate is ground. apparatus.   2. The device for manufacturing a pin of a power transmission chain according to claim 1, wherein the work holder holds a plurality of manufacturing intermediate bodies arranged radially around the central axis of the tool holder. In Claim 1, the work holder has a central axis along the central axis of the tool holder,
The center axis of the work holder is arranged offset with respect to the center axis of the tool holder,
The work holder holds a plurality of manufacturing intermediates arranged radially around the central axis of the work holder,
The center axis of the tool holder is a device for manufacturing a pin of a power transmission chain arranged on a virtual cylindrical surface centered on the center axis of the work holder. In Claim 3, the work holder is opened outward in the radial direction of the work holder, and an accommodation groove in which an intermediate portion in the longitudinal direction of the production intermediate is accommodated;
An apparatus for manufacturing a pin of a power transmission chain, comprising: a pressing member that presses an intermediate portion of an intermediate for manufacturing against an inner surface of a receiving groove.   The tool holder according to any one of claims 1 to 4, wherein the tool holder includes a shaft portion or an insertion hole centered on a central axis of the tool holder, and the work holder is inserted through the shaft portion or An apparatus for manufacturing a pin of a power transmission chain including a shaft portion that fits into an insertion hole of a tool holder. A tool holder having a central axis and holding a grinding member for grinding each of the pair of end faces of the pin manufacturing intermediate, and the longitudinal direction of the manufacturing intermediate along the central axis of the tool holder A pair of power transmission chains characterized by grinding a pair of end faces of the manufacturing intermediate by relatively rotating the work holder holding the manufacturing intermediate in the state around the central axis of the tool holder Manufacturing method.

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