JP2018076886A - chain - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a chain which can extend the life.SOLUTION: A chain 11 includes: a pair of first link plates 12 which are spaced away from each other while facing each other; cylindrical bushes 19 joined to the pair of first link plates 12 at both end parts; first cylindrical pins 21 rotatably inserted into the bushes 19; a pair of second link plates 14 which are disposed so as to sandwich the pair of first link plates 12 from the outer side and to which both end parts of the first pins 21 are joined; second pins 23 rotatably inserted into the first pins 21; and a pair of third link plates 16 which are disposed so as to sandwich the pair of second link plates 14 from the outer side and to which both end parts of the second pins 23 are joined.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a chain.

  Generally, as a chain, for example, a roller chain shown in Patent Document 1 is known. Such a roller chain includes an inner link in which both ends of a pair of inner link plates are connected by a cylindrical bush, and a link in which both ends of a pair of outer link plates are rotatably inserted into the bush. It has a configuration provided with outer links each connected by a pin, and a roller that is rotatably provided surrounding the outer peripheral surface of the bush.

  In such a roller chain, since the life is determined by the wear resistance between the pin and the bush, a long life is ensured by nitriding the pin and the bush to increase the wear resistance. .

JP 2011-241007 A

  By the way, in the roller chain as described above, although nitriding treatment is applied to the pins and bushes in order to ensure a long life, there is room for improvement in extending the life.

  The present invention has been made paying attention to such problems existing in the prior art. The aim is to provide a chain that can extend its life.

Hereinafter, means for solving the above-described problems and the effects thereof will be described.
A chain that solves the above problems includes a pair of first link plates that are arranged opposite to each other, a cylindrical bush that is joined to the pair of first link plates at both ends, and rotates to the bush. A cylindrical first pin that can be inserted, a pair of second link plates that are arranged so as to sandwich the pair of first link plates from the outside, and both ends of the first pins are joined to each other; A second pin that is rotatably inserted into one pin, and a pair of third link plates that are arranged so as to sandwich the pair of second link plates from the outside and to which both ends of the second pin are joined. Prepare.

  According to this configuration, the load when tension is applied to the chain is distributed and applied to the contact surface between the bush and the first pin and the contact surface between the first pin and the second pin. And the surface pressure between the first pin and the second pin are reduced. For this reason, since wear of the bush, the first pin, and the second pin is effectively suppressed, the life of the chain can be extended.

In the chain, it is preferable that the first pin is made of a material that is harder than the bush and softer than the second pin.
According to this configuration, the bush, the first pin, and the second pin are made of a material whose hardness is so hard that it is located inside, so that the strength of the chain can be suitably maintained. .

The chain preferably includes a cylindrical roller that is inserted into the bush and is rotatably supported by the bush.
According to this configuration, the chain can be smoothly meshed with the sprocket.

  According to the present invention, the lifetime of the chain can be extended.

The disassembled perspective view which shows a part of chain of embodiment. Sectional drawing which shows a part of chain. The cross-sectional enlarged view which shows a part of chain of the example of a change.

Hereinafter, embodiments of the chain will be described with reference to the drawings.
As shown in FIG. 1, the chain 11 is made of, for example, stainless steel, and includes a plurality of first links 13 each having a pair of first link plates 12 disposed to face each other in the width direction Y, and And a plurality of second links 15 each having a pair of second link plates 14 disposed so as to sandwich the pair of first link plates 12 from the outside in the width direction Y. Furthermore, the chain 11 includes a plurality of third links 17 each having a pair of third link plates 16 disposed so as to sandwich the pair of second link plates 14 from the outside in the width direction Y.

  The first link plate 12 of the first link 13, the second link plate 14 of the second link 15, and the third link plate 16 of the third link 17 are from one side in the longitudinal direction in which the chain 11 is orthogonal to the width direction Y. It has a substantially rectangular plate shape that extends along the series direction X, which is also the moving direction when it is pulled and moved.

  The first link plate 12, the second link plate 14, and the third link plate 16 of the third link 17 facing each other in the width direction Y are disposed so as to be parallel to each other. Therefore, the chain 11 according to the present embodiment includes the first link 13, the second link 15, and the third link 17 in the series direction X at the first link plate 12 on the one end side and the other end side, respectively, This is a so-called flat type chain configured such that the distance between the link plates 14 and the distance between the third link plates 16 are equal.

  As shown in FIGS. 1 and 2, circular bush insertion holes 18 penetrate the width direction Y, which is also the thickness direction of the first link plate 12, at both ends in the series direction X of the first link plate 12. It is formed as follows. Two cylindrical bushes 19 are assembled between the pair of first link plates 12 facing each other in the first link 13 so as to maintain the distance between the pair of first link plates 12. Both ends of the bush 19 are fitted (joined) to the bush insertion holes 18 of the pair of first link plates 12 so as not to rotate.

  At both ends of the second link plate 14 in the series direction X, circular first pin insertion holes 22 into which cylindrical first pins 21 each having an outer diameter slightly smaller than the inner diameter of the bush 19 are fitted. The second link plate 14 is formed so as to penetrate in the width direction Y which is also the thickness direction.

  The pair of second link plates 14 of the second link 15 sandwich the pair of first link plates 12 in the first link 13 formed by assembling the bushes 19 between the pair of first link plates 12 from the outside. In this state, the first link 21 and the bush 19 are connected to the first link plate 12 of the first link 13 so as to be rotatable.

  In this case, the first pin 21 is inserted in the bushing 19 assembled between the pair of first link plates 12 of the first link 13 at the intermediate portion other than both ends, and both ends are second. The pair of second link plates 14 of the link 15 are fitted (joined) so as not to rotate with respect to the first pin insertion holes 22.

  Accordingly, both end portions of the first pin 21 penetrate the pair of second link plates 14, respectively, and the first link plate 12 of the first link 13 and the second link plate of the second link 15 that are adjacent in the series direction X. 14 are connected to each other in the series direction X through the first pin 21 and the bush 19 so as to be rotatable.

  A lubricant is disposed between the inner peripheral surface 19 b of the bush 19 and the outer peripheral surface 21 a of the first pin 21. As the lubricant, a solid lubricant (for example, powdered graphite, powdered molybdenum disulfide, or the like compressed into a cylindrical shape), grease, or the like can be used. In this embodiment, grease is employed as the lubricant.

  A circular second pin insertion hole into which a cylindrical second pin 23 having an outer diameter slightly smaller than the inner diameter of the first pin 21 is fitted at both ends in the serial direction X of the third link plate 16. 24 is formed so as to penetrate in the width direction Y which is also the thickness direction of the third link plate 16.

  Then, the pair of third link plates 16 of the third link 17 has the pair of second link plates 14 in the second link 15 formed by assembling the first pins 21 between the pair of second link plates 14 outside. The second link plate 14 of the second link 15 is pivotally connected to the second link plate 14 via the second pin 23 and the first pin 21.

  In this case, the second pin 23 has an intermediate portion other than both end portions rotatably inserted into the first pin 21 assembled between the pair of second link plates 14 of the second link 15, and both end portions are The pair of third link plates 16 of the third link 17 are fitted (joined) to the second pin insertion holes 24 in a non-rotatable manner.

  Therefore, both ends of the second pin 23 pass through the pair of third link plates 16, respectively, and the second link plate 14 of the second link 15 and the third link plate of the third link 17 that are adjacent in the series direction X. 16 are connected to each other in the series direction X via the second pin 23 and the first pin 21 so as to be rotatable. A lubricant is disposed between the inner peripheral surface 21 b of the first pin 21 and the outer peripheral surface 23 a of the second pin 23.

  The first pin 21 is made of a material that is harder than the material constituting the bush 19 and softer than the material constituting the second pin 23. Therefore, among the first pin 21, the bush 19, and the second pin 23, the second pin 23 is the hardest and the bush 19 is the softest. That is, the first pin 21, the bush 19, and the second pin 23 are made of a material that is harder as it is located on the inner side.

Next, the operation of the chain 11 will be described.
Now, when the sprocket is rotated in a state where the chain 11 is engaged with the sprocket (not shown), the chain 11 is moved while receiving the tension in the series direction X. At this time, since the load applied to the chain 11 is distributed and applied to two places, that is, the contact surface between the bush 19 and the first pin 21 and the contact surface between the first pin 21 and the second pin 23, the load is applied. The surface pressure between the bush 19 and the first pin 21 and the surface pressure between the first pin 21 and the second pin 23 are reduced as compared with the case where either one of the two locations is applied.

  For this reason, since wear of the bush 19, the first pin 21, and the second pin 23 is effectively suppressed, elongation due to wear of the chain 11 is suppressed. As a result, the life of the chain 11 is extended.

According to the embodiment detailed above, the following effects are exhibited.
(1) The chain 11 includes a pair of first link plates 12, a cylindrical bush 19 having both ends joined to the pair of first link plates 12, and a cylindrical shape rotatably inserted into the bush 19. The first pin 21 is disposed so as to sandwich the pair of first link plates 12 from the outside, and the pair of second link plates 14 to which both end portions of the first pin 21 are respectively joined, and the first pin 21 can rotate. A pair of third link plates 16 that are arranged so as to sandwich the pair of second link plates 14 from the outside and are joined to both ends of the second pins 23, respectively. It has. For this reason, the load when tension is applied to the chain 11 is distributed and applied to two places, the contact surface between the bush 19 and the first pin 21 and the contact surface between the first pin 21 and the second pin 23. Therefore, the surface pressure between the bush 19 and the first pin 21 and the surface pressure between the first pin 21 and the second pin 23 can be reduced. Therefore, since wear of the bush 19, the first pin 21, and the second pin 23 can be effectively suppressed, the life of the chain 11 can be extended.

  (2) In the chain 11, the first pin 21 is made of a material that is harder than the bush 19 and softer than the second pin 23. For this reason, since the bush 19, the 1st pin 21, and the 2nd pin 23 are comprised with a material whose hardness is so hard that it is located inside among these, the intensity | strength of the chain 11 can be maintained suitably. .

(Example of change)
In addition, you may change the said embodiment as follows.
As shown in FIG. 3, a cylindrical roller 25 may be disposed outside the bush 19 in the chain 11. In this case, the roller 25 is rotatably supported by the bush 19 with the bush 19 inserted therein. That is, the bush 19 is loosely fitted to the roller 25. In this way, the chain 11 can be smoothly meshed with the sprocket (not shown). In addition, when providing the roller 25 in the chain 11, it is preferable that the chain 11 is a chain whose pitch was made longer than a standard chain.

In the chain 11, the first pin 21 may be subjected to nitriding treatment. In this way, wear of the first pin 21 can be more effectively suppressed.
In the chain 11, the second pin 23 may be nitrided. In this way, wear of the second pin 23 can be more effectively suppressed.

  The first pin 21 is not necessarily made of a material that is harder than the bush 19 and softer than the second pin 23. That is, the order of hardness of the first pin 21, the bush 19, and the second pin 23 may be arbitrarily changed.

  In the chain 11, the second pin 23 is changed to a cylindrical third pin, and a columnar fourth pin is rotatably inserted into the third pin so as to sandwich the pair of third link plates 16 from the outside. You may make it join the both ends of a 4th pin to a pair of 4th link plate arrange | positioned in (4), respectively. In this way, the load when the tension is applied to the chain 11 is caused by the contact surface between the bush 19 and the first pin 21, the contact surface between the first pin 21 and the third pin, the third pin and the fourth pin. It is distributed in three places with the contact surface. For this reason, the surface pressure between the bush 19 and the first pin 21, the surface pressure between the first pin 21 and the third pin, and the surface pressure between the third pin and the fourth pin are reduced. As a result, since the wear of the bush 19, the first pin 21, the third pin, and the fourth pin is further effectively suppressed, the life of the chain 11 can be further extended.

Further, the technical idea that can be grasped from the above embodiment will be described below.
(A) The chain according to any one of claims 1 to 3, wherein the first pin is subjected to nitriding treatment. According to this configuration, wear of the first pin can be more effectively suppressed.

  (B) The chain according to any one of claims 1 to 3 and (a) above, wherein the second pin is nitrided. According to this configuration, wear of the second pin can be more effectively suppressed.

  DESCRIPTION OF SYMBOLS 11 ... Chain, 12 ... 1st link plate, 14 ... 2nd link plate, 16 ... 3rd link plate, 19 ... Bush, 25 ... Roller, 21 ... 1st pin, 23 ... 2nd pin.

Claims (3)

A pair of first link plates disposed opposite to each other;
Cylindrical bushes whose both ends are joined to the pair of first link plates;
A cylindrical first pin rotatably inserted into the bush;
A pair of second link plates which are arranged so as to sandwich the pair of first link plates from the outside and to which both end portions of the first pins are respectively joined;
A second pin rotatably inserted into the first pin;
A pair of third link plates which are arranged so as to sandwich the pair of second link plates from the outside and to which both end portions of the second pins are respectively joined;
A chain characterized by comprising.   The chain according to claim 1, wherein the first pin is made of a material that is harder than the bush and softer than the second pin.   The chain according to claim 1 or 2, further comprising a cylindrical roller into which the bush is inserted and rotatably supported by the bush.

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