JP2018013154A - Power transmission chain - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power transmission chain of high durability.SOLUTION: A pair of pins 3, 4 are inserted to through holes 5, 6 of a link 2. The link 2 includes a pair of lateral frame portions 31, 32 disposed at both sides holding both through holes 5, 6 therebetween in an orthogonal direction V, and a pair of outer vertical frame portions 41, 42 disposed at both sides holding the through holes 5, 6 therebetween in a chain advancing direction X, and connecting the lateral frame portions 31, 32. An inner periphery 5a of the through hole 5 includes a pin fixing portion 13 to which a first pin 3 is fixed. The pin fixing portion 13 includes a pair of pressure-in edge portions 13c, 13d to which a pair of end portions 3c, 3d in the orthogonal direction V of the first pin 3 are respectively press-fitted and fixed. The pressure-in edge portions 13, 13d respectively include first parts 51 adjacent to the outer vertical frame portion 41 and second parts 52 adjacent to the first parts 51. A press-in margin of the second part 52 and the first pin 3 is larger than a press-in margin of the first part 51 and the first pin 3.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a power transmission chain.

In an endless power transmission chain wound around two pulleys, a plurality of links having a pair of through holes arranged in the chain traveling direction, and a pair of pins inserted into the through holes of the link and connecting the links to each other Some types are provided (see, for example, Patent Document 1).
In Patent Document 1, each pin is press-fitted between a chain outer diameter side edge and a chain inner diameter side edge in a corresponding through hole.

Japanese Patent Laid-Open No. 2014-9801

In this type of power transmission chain, the pin is intermittently engaged with the conical sheave surface of the pulley, so that the chain travels and power is transmitted. Noise is generated by vibration caused by impact when the pins sequentially contact the pulley. This noise peaks at a frequency that is the reciprocal of the period in which the pin contacts the sheave surface.
By reducing the pitch between the pins inserted into one through-hole and the pins inserted into the other through-hole (equivalent to the link connecting pitch), the noise frequency is made higher than the audible range, and the experience It is possible to suppress the above noise.

  However, when the pin arrangement pitch (link connection pitch) is shortened, the link itself is shortened, and the intermediate pillar portion (intermediate vertical frame portion) between the pair of through holes becomes narrower in the chain traveling direction. For this reason, the link is easily elastically deformed, and the edge portion into which the pin is press-fitted and the pin slide on the inner periphery of the through hole. This sliding may cause wear and reduce the durability of the link.

  An object of the present invention is to provide a power transmission chain with excellent durability.

  The invention of claim 1 is wound around a pair of pulleys (70; 80) each having a pair of opposed sheave surfaces (72a, 73a; 82a, 83a), and engages with the sheave surfaces to generate power. A power transmission chain (1) for transmission, which includes a pair of through holes (5, 6) arranged in the chain traveling direction (X), and the chain traveling direction and the chain width direction (W) perpendicular to the chain traveling direction A plurality of links (2) arranged in a row, and connecting members (11, 12) that are inserted through the pair of through-holes and connect the plurality of links, and each of the connecting members accompanies bending between the links. It includes a pair of pins (3, 4) that are in rolling contact with each other, and each of the pins is a pair of end portions (3c) that are opposed to an orthogonal direction (V) orthogonal to both the chain traveling direction and the chain width direction. , 3d; c, 4d), and each of the links is disposed on both sides of the pair of through holes in the orthogonal direction and extends in the chain traveling direction, and the pair of horizontal frame portions (31, 32), A pair of outer vertical frame portions (41, 42), which are arranged on both sides sandwiching the through hole in the chain traveling direction, extend in the orthogonal direction and connect the pair of horizontal frame portions, and the pair of through holes An intermediate vertical frame portion (43) connected between the pair of horizontal frame portions, and the inner periphery of each through hole has a pin fixing portion (13, 15) to which a corresponding pin is fixed. Each of the pin fixing portions includes a pair of press-fitting edge portions (13c, 13d; 15c, 15d) in which the pair of end portions of the corresponding pins are press-fitted and fixed. A first portion (51; 61) adjacent to the outer vertical frame portion and adjacent to the first portion A power transmission chain including a second portion (52; 62), wherein a press-fit allowance between the second portion and the corresponding pin is larger than a press-fit allowance between the first portion and the corresponding pin. provide.

In addition, although the alphanumeric character in a parenthesis represents the corresponding component etc. in embodiment mentioned later, this does not mean that this invention should be limited to those embodiment as a matter of course. The same applies hereinafter.
The second portion of each press-fitting edge portion may include a curved convex portion (52a; 62a) protruding in the orthogonal direction at an end opposite to the first portion. Good.

  As in claim 3, each of the outer vertical frame portions and the corresponding pin includes a pair of facing portions facing each other in the chain traveling direction, and at least one of the pair of facing portions includes the corresponding pin. You may include the press convex part (53, 63) which protrudes to the other side of the pair of said opposing part so that it may press on the said curved convex part.

  In the invention of claim 1, in the press-fitting edge portion of each through hole in which each end portion of the pin corresponding to each through hole is press-fitted and fixed, the first portion is closer to the first portion than the first portion adjacent to the outer vertical frame portion. The press-fitting allowance for the pin is increased in the adjacent second portion. For this reason, the sliding of the edge part of a pin with respect to a press-fit edge part so that a pin separates from the corresponding outer vertical frame part can be suppressed effectively, and durability can be improved.

In the invention of claim 2, the curved convex portion generates a reaction force that presses the pin to the corresponding outer vertical frame portion in the second portion where the press-fitting allowance is relatively large. For this reason, sliding of the edge part of a pin with respect to a press-fit edge part is suppressed more effectively.
In the invention of claim 3, the pin is pressed against the curved convex portion by the pressing convex portion provided on the outer vertical frame portion and the corresponding portion of the corresponding pin. For this reason, sliding of the edge part of the pin with respect to a press-fit edge part is suppressed more effectively.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view schematically showing a main configuration of a chain type continuously variable transmission as a power transmission device including a power transmission chain according to a first embodiment of the present invention. It is a partial expanded sectional view of the drive pulley (driven pulley) and power transmission chain of FIG. It is a fragmentary sectional top view of the principal part of the power transmission chain of 1st Embodiment. It is the figure which looked at the principal part of the power transmission chain of a 1st embodiment from the chain width direction. It is the figure which looked at the principal part of the power transmission chain of 2nd Embodiment of this invention from the chain width direction.

DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, embodiments of the invention will be described with reference to the drawings.
(First embodiment)
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 a first embodiment of the present invention. It is a perspective view.

  As shown in FIG. 1, a continuously variable transmission 100 includes a drive pulley 70 made of metal (such as structural steel) as a first pulley and a driven pulley 80 made of metal (such as structural steel) as a second pulley. And an endless power transmission chain 1 wound between the pulleys 70 and 80. The continuously variable transmission 100 is mounted on a vehicle such as an automobile. The power transmission chain 1 in FIG. 1 is partially shown in cross section for easy understanding.

FIG. 2 is a partially enlarged sectional view of the drive pulley 70 (driven pulley 80) and the chain 1 of FIG. As shown in FIGS. 1 and 2, the drive pulley 70 is attached to an input shaft 71 that is connected to a drive source of the vehicle so as to be able to transmit power. The drive pulley 70 includes a fixed sheave 72 and a movable sheave 73.
The fixed sheave 72 and the movable sheave 73 have a pair of sheave surfaces 72 a and 73 a that face each other in the axial direction of the input shaft 71. The pair of sheave surfaces 72a and 73a include conical inclined surfaces that are inclined in opposite directions. A groove having a V-shaped cross section into which the power transmission chain 1 is fitted is defined between the pair of sheave surfaces 72a and 73a. The power transmission chain 1 is sandwiched between the pair of sheave surfaces 72a and 73a under a strong pressure.

  A hydraulic actuator (not shown) for changing the groove width is connected to the movable sheave 73. At the time of shifting, the groove width is changed by moving the movable sheave 73 in the axial direction of the input shaft 71 (the left-right direction in FIG. 2). As a result, the power transmission chain 1 is moved in the radial direction of the input shaft 71 (the vertical direction in FIG. 2), and the winding radius (effective radius) of the power transmission chain 1 with respect to the drive pulley 70 is changed.

  On the other hand, as shown in FIGS. 1 and 2, the driven pulley 80 is attached to an output shaft 81 that is connected to a drive wheel (not shown) so as to be able to transmit power so as to be integrally rotatable. The driven pulley 80 includes a movable sheave 82 and a fixed sheave 83. The movable sheave 82 and the fixed sheave 83 each have a pair of sheave surfaces 82 a and 83 a that face each other in the axial direction of the output shaft 81. A groove having a V-shaped cross section into which the power transmission chain 1 is fitted is defined between the pair of sheave surfaces 82a and 83a. The power transmission chain 1 is sandwiched between the pair of sheave surfaces 82a and 83a under strong pressure.

A hydraulic actuator (not shown) is connected to the movable sheave 82 of the driven pulley 80 in the same manner as the movable sheave 73 of the drive pulley 70. At the time of shifting, the movable sheave 82 is moved to change the groove width. As a result, the power transmission chain 1 is moved in the radial direction of the output shaft 81, and the winding radius of the chain 1 around the driven pulley 80 is changed.
FIG. 3 is a partial cross-sectional plan view of a main part of the power transmission chain 1. As shown in FIGS. 1 to 3, a direction along the chain traveling direction of the power transmission chain 1 is referred to as a “chain traveling direction X”, a direction orthogonal to the chain traveling direction X and along the width direction of the power transmission chain 1. Is referred to as “chain width direction W”. A direction orthogonal to both the chain traveling direction X (the direction orthogonal to the paper surface in FIG. 2) and the chain width direction W is referred to as an “orthogonal direction V”. One of the orthogonal directions V is the chain inner diameter side V1, and the other of the orthogonal directions V is the chain outer diameter side V2.

FIG. 4 is a diagram of a main part of the power transmission chain 1 as viewed from the chain width direction W. As shown in FIGS. 3 and 4, the power transmission chain 1 includes a plurality of links 2 arranged in the chain traveling direction X and the chain width direction W, and a plurality of links 2 connected in a bendable manner so as to extend in the chain width direction W. A first connecting member 11 and a second connecting member 12 are provided.
Each link 2 is formed of, for example, a steel plate-like member formed in a substantially rectangular shape when viewed from the chain width direction W. Each link 2 forms a first through hole 5 and a second through hole 6 aligned in the chain traveling direction X. The first through hole 5 is arranged on the chain traveling direction X side with respect to the second through hole 6.

Each link 2 includes a pair of horizontal frame portions 31 and 32, a pair of outer vertical frame portions 41 and 42, and an intermediate vertical frame portion 43.
The pair of horizontal frame portions 31 and 32 extend in the chain traveling direction X and are disposed on both sides of the through holes 5 and 6 in the orthogonal direction V. The horizontal frame portion 31 is disposed on the chain outer diameter side V2 with respect to the orthogonal direction V, and the horizontal frame portion 32 is disposed on the chain inner diameter side V1 with respect to the orthogonal direction V.

  The outer vertical frame portions 41 and 42 and the intermediate vertical frame portion 43 extend in the orthogonal direction V. The pair of outer vertical frame portions 41, 42 are arranged on both sides of the through holes 5, 6 sandwiched in the chain traveling direction X, and connect the pair of horizontal frame portions 31, 32. The outer vertical frame portion 41 is disposed closer to the chain traveling direction X than the outer vertical frame portion 42. The intermediate vertical frame portion 43 is disposed between the first through hole 5 and the second through hole 6 and connects the pair of horizontal frame portions 31 and 32.

The first connecting member 11 is inserted through the first through hole 5, and the second connecting member 12 is inserted through the second through hole 6. Each of the first connecting member 11 and the second connecting member 12 includes a first pin 3 and a second pin 4 as a pair of power transmission pins.
The first pin 3 and the second pin 4 of each connecting member 11, 12 are arranged such that the second pin 4 is disposed on the front side (chain traveling direction X side), and the first pin 3 is disposed on the rear side (opposite side of the chain traveling direction X). XB) are opposed to each other. The first pin 3 and the second pin 4 are in rolling contact with each other at the contact portion A as the corresponding links 2 are bent. The rolling sliding contact means a contact including at least one of a rolling contact and a sliding contact.

The distance between the contact portion A of both pins 3 and 4 in the first through-hole 5 and the contact portion A of both pins 3 and 4 in the second through-hole 6 corresponds to the connection pitch P of the link 2.
As shown in FIG. 3, the first pin 3 and the second pin 4 are long (plate-like) members extending in the chain width direction W. The pair of end portions 17 in the longitudinal direction (chain width direction W) of the first pin 3 and the pair of end portions 18 in the longitudinal direction (chain width direction W) of the second pin 4 are aligned in the chain width direction W. The columns protrude from the pair of links 2 arranged at the pair of ends in the chain width direction W to the outside in the chain width direction W, respectively.

The first pin 3 and the second pin 4 constitute a power transmission pin that transmits power to the pulleys 70 and 80. That is, as shown in FIG. 2, the pair of end faces 3 e and 4 e in the chain width direction W of the pins 3 and 4 as power transmission pins are in contact with the pulleys 70 and 80.
Specifically, the contact area provided on a part of the end surfaces 3e and 4e of the pins 3 and 4 can transmit power to the sheave surfaces 72a and 73a (82a and 83a) of the pulleys 70 and 80 via the lubricating oil film. Frictionally engages. Both pins 3 and 4 are sandwiched between sheave surfaces 72a and 73a (82a and 83a), whereby power is transmitted between the pins 3 and 4 and the pulleys 70 and 80. Each of the pins 3 and 4 is made of a high-strength wear-resistant material such as bearing steel (SUJ2), for example, because it directly contributes to power transmission through its end faces 3e and 4e. The contact area of each pin 3, 4 has a contact center C.

  As shown in FIG. 3, the power transmission chain 1 includes a first link row 21, a second link row 22, and a third link row configured by a plurality of links 2 arranged in the chain width direction W in the same phase with respect to the chain traveling direction X. The link row 23 is arranged in this order in the chain traveling direction X to form one link module 20. A plurality of link modules 20 are connected in the chain traveling direction X to form an endless power transmission chain 1.

  Although only one each of the first link row 21, the second link row 22 and the third link row 23 is illustrated, along the chain traveling direction X, the first link row 21, the second link row 22 and the third link row 23 The three link rows 23 are arranged to repeat. That is, the link module 20 is arranged to repeat in the chain traveling direction X. The links 2 in the two link rows adjacent to each other in the chain traveling direction X are sequentially connected by the corresponding connecting members 11 and 12 to form the endless power transmission chain 1.

  The power transmission chain 1 is a so-called press-fit type chain. Specifically, as shown in FIG. 5, the first pin 3 is loosely fitted in the first through hole 5 of each link 2 so as to be relatively movable, and is relative to the second through hole 6 of each link 2. It is press-fitted so that movement is restricted. The second pin 4 is press-fitted and fitted in the first through hole 5 of each link 2 so as to be restricted in relative movement, and is loosely movable in the second through hole 6 of each link 2. It is fitted.

  In other words, the first pin 3 is loosely fitted in the first through hole 5 of each link 2 so as to be relatively movable, and the second pin 4 paired with the first pin 3 is relatively moved. It is press-fitted so as to be regulated. In addition, the first pin 3 is press-fitted into the second through hole 6 of each link 2 so that relative movement is restricted, and the second pin 4 that makes a pair with the first pin 3 is provided. It is loosely fitted so as to be relatively movable.

Specifically, the inner periphery 5a of the first through hole 5 of the link 2 includes a second pin fixing portion 13 to which the second pin 4 is press-fitted and fixed. In the first through hole 5, the first pin movable portion 14 in which the first pin 3 is movably fitted in a space excluding a portion occupied by the second pin 4 press-fitted and fixed to the second pin fixing portion 13. It is said that.
The inner periphery 6 a of the second through hole 6 includes a first pin fixing portion 15 to which the first pin 3 is press-fitted and fixed. In the second through hole 6, the second pin movable portion 16 in which the second pin 4 is movably fitted in a space excluding the portion occupied by the first pin 3 press-fitted and fixed to the first pin fixing portion 15. It is said that.

The first pin 3 includes a front portion 3a on the chain traveling direction X side, a rear portion 3b on the opposite side XB to the chain traveling direction X, an end portion 3c on the chain inner diameter side V1 in the orthogonal direction V, and an outer side of the chain in the orthogonal direction V. And an end 3d of the radial side V2.
The second pin 4 includes a front part 4a on the chain traveling direction X side, a rear part 4b on the opposite side XB to the chain traveling direction X, an end part 4c on the chain inner diameter side V1 in the orthogonal direction V, and an outer side of the chain in the orthogonal direction V. The second pin fixing portion 13 on the inner periphery 5a of the first through hole 5 including the end portion 4d on the radial side V2 has a pair of end portions 4c, 4d in the orthogonal direction V of the second pin 4 press-fitted and fixed. It includes a pair of press-fit edge portions 13c and 13d and a facing portion 13e that faces the front portion 4a (facing portion) of the second pin 4 so as to come into contact therewith. The facing portion 13e corresponds to an edge portion of the outer vertical frame portion 41 on the first through hole 5 side.

Each press-fitting edge portion 13 c, 13 d includes a first portion 51 adjacent to the outer vertical frame portion 41 and a second portion 52 adjacent to the first portion 51. The first portion 51 is formed in an R shape. In each press-fitting edge portion 13c, 13d, the press-fitting allowance between the second portion 52 and the second pin 4 is made larger than the press-fitting allowance between the first portion 51 and the second pin 4.
The second portions 52 of the press-fitting edge portions 13 c and 13 d of the second pin fixing portion 13 of the first through hole 5 are first in the orthogonal direction V at the end opposite to the first portion 51. A curved protrusion 52a protruding into the through hole 5 is included.

The first pin fixing portion 15 on the inner periphery 6a of the second through-hole 6 has a pair of press-fitting edge portions 15c and 15d in which a pair of end portions 3c and 3d in the orthogonal direction V of the first pin 3 are press-fitted and fixed, respectively. The first pin 32 includes a facing portion 15e facing the rear portion 3b (facing portion). The facing portion 15e corresponds to an edge portion of the outer vertical frame portion 42 on the second through hole 6 side.
Each of the press-fit edge portions 15 c and 15 d includes a first portion 61 adjacent to the outer vertical frame portion 42 and a second portion 62 adjacent to the first portion 61. The first portion 61 is formed in an R shape. In each press-fitting edge portion 15c, 15d, the press-fitting allowance between the second portion 62 and the first pin 3 is made larger than the press-fitting allowance between the first portion 61 and the first pin 3.

The second portions 62 of the press-fitting edge portions 15 c and 15 d of the first pin fixing portion 15 of the second through hole 6 are second in the orthogonal direction V at the end opposite to the first portion 61. A curved protrusion 62a protruding into the through hole 6 is included.
The rear portion 3b of the first pin 3 loosely fitted in the first through hole 5 and the front portion 4a of the second pin 4 loosely fitted in the second through hole 6 respectively face the intermediate vertical frame portion 43. ing.

  In each connecting member 11, 12, the front part 3 a of the first pin 3 and the rear part 4 b of the second pin 4 inserted through the same through-hole 5 (6) constitute opposing parts facing each other. When the front part 3a of the first pin 3 and the rear part 4b of the second pin 4 as the opposing parts are brought into rolling contact with each other along with the bending between the links 2 adjacent to each other in the chain traveling direction X, both pins The contact portions A of 3 and 4 are displaced in the orthogonal direction V.

  When each link 2 moves from the straight region to the curved region or from the curved region to the straight region of the power transmission chain 1, the first pin 3 is fixed to the fixed second pin 4 in the first through hole 5. It moves in the first pin movable portion 14 while rolling at the contact portion A (including some sliding contact), and the second pin 4 is fixed in the second pin movable portion 16 in the second through hole 6. The first pin 3 moves while being in rolling contact with the contact surface of the first pin 3 at the contact portion A (including some sliding contact).

In each of the through holes 5 and 6, the contact portion A between the front portion 3a of the first pin 3 and the rear portion 4b of the second pin 4 is such that the power transmission chain 1 is on the positive side (the sheave surface 72a of the pulleys 70 and 80). 73a; bending direction when entering between 82a and 83a), it moves to the chain outer diameter side V2, and when the power transmission chain 1 is bent to the negative side, it moves to the chain inner diameter side V1.
In the present embodiment, the end portions 4c, 4d; 3c, 3d of the pins 4, 3 corresponding to the through holes 5, 6 are press-fitted and fixed, and the press-fit edge portions 13c, 13d; 15c of the through holes 5, 6 are fixed. 15d, the second portions 52, 62 adjacent to the first portions 51, 61 have a larger press-fitting allowance for the pins 4, 3 than the first portions 51, 61 adjacent to the outer vertical frame portions 41, 42. Is done. Therefore, the ends 4c, 4d; 3c, 3d of the pins 4, 3 with respect to the press-fitting edge portions 13c, 13d; 15c, 15d so that the pins 4, 3 are separated from the corresponding outer vertical frame portions 41, 42 are slid. The movement is effectively suppressed and the durability can be improved.

  In particular, when the connection pitch P of the link 2 is shortened in order to reduce the noise in the sensation by making the frequency peak of the impact sound between the pins 3 and 4 and the pulleys 70 and 80 higher than the audible range. The intermediate vertical frame portion 43 tends to be thin and the link 2 tends to be elastically deformed. In the present embodiment, the sliding of the pins 3 and 4 can be suppressed against the increase in elastic deformation of the link 2, and a great effect can be exhibited in improving the durability.

In addition, in the second portions 52 and 62 where the press-fitting allowance is larger than the first portions 51 and 61, the curved convex portions 52a and 62a connect the corresponding pins 4 and 3 to the corresponding outer vertical frame portions 41 and 42. Generates a reaction force to press. That is, the curved convex portion 52 a of the first through hole 5 generates a reaction force that presses the front portion 4 a of the pin 4 against the facing portion 13 e of the second pin fixing portion 13 of the first through hole 5. 6 curved convex portions 62 a generate a reaction force that presses the rear portion 3 b of the pin 3 against the facing portion 15 e of the first pin fixing portion 15 of the second through-hole 6. Therefore, sliding of the end portions 4c, 4d; 3c, 3d of the pins 4, 3 with respect to the press-fit edge portions 13c, 13d; 15c, 15d is more effectively suppressed, and durability can be further improved.
(Second Embodiment)
FIG. 5 is a view of a main part (link 2Q and pins 3 and 4) of the power transmission chain as viewed from the chain width direction W in the second embodiment of the present invention.

The second embodiment of FIG. 5 is different from the first embodiment of FIG. 4 as follows. That is, in the first through hole 5 of the link 2Q, the facing portion 13e (the edge portion of the outer vertical frame portion 41) facing the front portion 4a (facing portion) of the second pin 4 is curved and the second pin 4 is curved and convex. A pressing convex portion 53 protruding toward the front portion 4a side of the second pin 4 is included so as to be pressed by the portion 52a.
Further, in the second through-hole 6, the facing portion 15e (the edge of the outer vertical frame portion 42) facing the rear portion 3b (facing portion) of the first pin 3 presses the first pin 3 against the curved convex portion 62a. As shown, the pressing protrusion 63 that protrudes toward the rear portion 3b of the first pin 3 is included. Each pressing convex part 53 and 63 is formed in the convex curve shape.

  In the present embodiment, the corresponding pins 4 and 3 are pressed against the curved convex portions 52a and 62a by the pressing convex portions 53 and 63 provided on the outer vertical frame portions 41 and 42, respectively. For this reason, sliding of the edge parts 4c, 4d; 3c, 3d of the corresponding pins 4, 3 with respect to the press-fitting edge portions 13c, 13d; 15c, 15d is further effectively suppressed. Thereby, durability can be further improved.

The present invention is not limited to the embodiments described above. For example, in the second embodiment, a plurality of pressing convex portions 53 and 63 may be provided.
Moreover, in 2nd Embodiment, the 2nd pin 4 is a curved convex part by the reaction force in which the pressing convex part provided in the front part 4a of the 2nd pin 4 presses the opposing part 13e in the 1st through-hole 5. It may be pressed by 52a. That is, in the first through hole 5, the pressing convex portion may be provided on at least one of the front portion 4 a and the facing portion 13 e of the second pin 4. Moreover, in 2nd Embodiment, the 1st pin 3 is the curved convex part 62a in the 2nd through-hole 6 by the reaction force in which the press convex part provided in the rear part 3b of the 1st pin 3 presses the opposing part 15e. May be pressed. That is, the pressing convex portion may be provided in at least one of the rear portion 3 b of the first pin 3 and the facing portion 15 e in the second through hole 6.

  In addition, the present invention can be variously modified within the scope of the claims.

  DESCRIPTION OF SYMBOLS 1 ... Power transmission chain, 2; 2Q ... Link, 3 ... 1st pin, 3a ... Front part, 3b ... Rear part (opposite part), 3c, 3d ... (the orthogonal direction) end part, 4 ... 2nd pin, 4a ... front part (opposite part), 4b ... rear part, 5 ... first through hole, 5a ... inner periphery, 6 ... second through hole, 6a ... inner periphery, 11 ... first connecting member, 12 ... second connecting member, 13 ... 2nd pin fixing | fixed part, 13c, 13d ... Press-fit edge part, 13e ... Opposing part, 15 ... 1st pin fixing | fixed part, 15c, 15d ... Press-fit edge part, 15e ... Opposing part, 31, 32 ... Horizontal frame part, 41, 42 ... outer vertical frame part, 43 ... intermediate vertical frame part, 51 ... first part, 52 ... second part, 52a ... curved convex part, 53 ... pressing convex part, 61 ... first part, 62 ... second Part, 62a ... curved convex part, 63 ... pressing convex part, 70 ... drive pulley, 72a, 73a ... sheave surface, 80 ... driven pulley, 82a, 83 ... sheave surface, 100 ... continuously variable transmission, A ... contact portion, P ... connection pitch, V ... orthogonal direction, V1 ... chain inner diameter side, V2 ... chain outer diameter side, W ... chain width direction, X ... chain travel direction , XB ... Opposite direction of chain travel

Claims (3)

A power transmission chain that is wound between a pair of pulleys each having a pair of opposed sheave surfaces, and that engages with the sheave surfaces to transmit power,
A plurality of links including a pair of through holes arranged in the chain traveling direction, and arranged in the chain width direction perpendicular to the chain traveling direction and the chain traveling direction;
A connecting member that is inserted through the pair of through-holes and connects the plurality of links;
Each of the connecting members includes a pair of pins that are in rolling contact with each other as the link is bent.
Each of the pins includes a pair of end portions opposed to an orthogonal direction orthogonal to both the chain traveling direction and the chain width direction,
Each of the links is disposed on both sides of the pair of through holes in the orthogonal direction, and a pair of horizontal frame portions extending in the chain traveling direction, and on both sides of the pair of through holes in the chain traveling direction. A pair of outer vertical frame portions arranged and extending in the orthogonal direction and connecting the pair of horizontal frame portions; and an intermediate vertical frame arranged between the pair of horizontal frame portions and arranged between the pair of through-holes. And
The inner circumference of each through hole includes a pin fixing portion to which a corresponding pin is fixed,
Each of the pin fixing portions includes a pair of press-fitting edge portions in which the pair of end portions of the corresponding pins are press-fitted and fixed,
Each of the press-fitting edge portions includes a first portion adjacent to the outer vertical frame portion, and a second portion adjacent to the first portion,
A power transmission chain in which a press-fitting allowance between the second part and the corresponding pin is larger than a press-fitting allowance between the first part and the corresponding pin. The power transmission chain according to claim 1,
The power transmission chain, wherein the second portion of each press-fitting edge portion includes a curved convex portion projecting in the orthogonal direction at an end opposite to the first portion. The power transmission chain according to claim 2,
Each of the outer vertical frame portions and the corresponding pin includes a pair of facing portions facing each other in the chain traveling direction,
At least one of the pair of opposing portions includes a power projection chain that includes a pressing convex portion that protrudes to the other side of the pair of opposing portions so as to press the corresponding pin against the curved convex portion.

Images