JP2009210006A - Chain - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a chain reducing noise and vibration, and reducing a power transmission loss, by preventing abrasion and an elongation or damage of the chain, by uniformly contacting an outer peripheral surface of a connection pin with an inner peripheral surface of a bush even by deflection of the connection pin. <P>SOLUTION: In this chain 100, the connection pin 122 pressed in and fitted to an outer plate 121 is fitted to and inserted into the cylindrical bush 112 pressed in and fitted to an inner plate 111, and the inner plate 111 and the outer plate 121 are alternately connected in large numbers. The connection pin 122 is formed in a larger shape in a diameter rl of a central part in the longitudinal direction than a diameter rs of both end parts. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a chain used for a power transmission mechanism or a transport mechanism of an automobile, an industrial machine, or the like.

  Conventionally, a pair of left and right inner plates, a cylindrical bush whose both ends are press-fitted to the inner plate, a pair of left and right outer plates disposed on both outer sides of the inner plate, and the bush are rotatably fitted. In addition, there is known a chain in which both end portions are constituted by connecting pins press-fitted to the outer plate, and a large number of the inner plate and the outer plate are alternately connected.

As shown in FIG. 4, these chains 500 are configured by a large number of alternately connected inner links 510 and outer links 520.
The inner link 510 includes a pair of inner plates 511 each having two bushing holes 513, and two cylindrical bushings 512 each having both ends fitted and fixed to the bushing holes 513 of the pair of inner plates 511. The roller 514 is rotatably fitted to both bushings 512.
The diameter of the inner periphery of the cylindrical bush 512 is configured uniformly in the axial direction.
The outer link 520 includes a pair of outer plates 521 each having two pin holes 523 and two connecting pins 522 each having both ends fitted and fixed to the pin holes 523 of the pair of outer plates 521. The
A large number of inner links 510 and outer links 520 are connected alternately by inserting connecting pins 522 into a cylindrical bush 512 so as to be freely rotatable.

When an actual tensile force is applied to such a chain 500, as shown in FIG. 5, the inner peripheral surface of a cylindrical bush 512 and the outer peripheral surface of a connecting pin 522 rotatably inserted in the bush 512 are formed. The chain 500 comes into contact with each other to transmit tension, and the chain 500 constitutes a power transmission mechanism as a whole (see, for example, Patent Documents 1 and 2).
Japanese Patent Laying-Open No. 2004-257531 (second page, FIG. 5) JP 2007-107583 A (2nd page, FIG. 8)

However, in such a conventional chain 500, as shown in FIG. 6, the tensile force f at the connecting pin 522 is concentrated at a plurality of different positions and acts in a direction to bend the connecting pin 522. Due to the bending of the connecting pin, the inner peripheral surface of the cylindrical bush 512 and the outer peripheral surface of the connecting pin 522 cannot be evenly contacted, and the inner peripheral surface of the cylindrical bush 512 and the outer peripheral surface of the connecting pin 522 are local. There is a problem that the chain 500 as a whole is elongated.
Further, since the connecting pin 522 is bent and the inner peripheral surface of the bush 512 and the outer peripheral surface of the connecting pin 522 are in point contact, vibration and noise are easily generated.

  Such a conventional chain 500 has a large power transmission loss in the entire power transmission mechanism or transport mechanism of an automobile, an industrial machine or the like using the chain 500, and it is necessary to apply a larger tensile force. There is a problem that the risk of damage to the power transmission mechanism 500 and the power transmission mechanism or the transport mechanism using the same increases, and the service life is shortened.

  The present invention solves the problems of the prior art as described above, that is, the object of the present invention is to make the inner peripheral surface of the bush and the outer peripheral surface of the connecting pin evenly contact even when the connecting pin is bent. The tension on the inner peripheral surface of the bush and the outer peripheral surface of the connecting pin is made equal in the longitudinal direction of the connecting pin to prevent chain wear, elongation, damage, etc., reducing noise and vibration, and reducing power transmission loss Is to provide a chain.

  The invention according to claim 1 includes a pair of left and right inner plates, a cylindrical bush having both ends press-fitted to the inner plate, a pair of left and right outer plates disposed on both outer sides of the inner plate, In the chain in which both ends of the bush are rotatably inserted into the bush and press-fitted to the outer plate, and the inner plate and the outer plate are alternately connected, the connecting pin However, the said subject is solved because the diameter of the center part of a longitudinal direction is formed in the shape larger than the diameter of both ends.

  In the invention according to claim 2, in addition to the structure of the chain described in claim 1, the cylindrical bush further includes a roller on the outer periphery thereof, so that the above problem can be further solved. It is a solution.

  The chain according to the first aspect of the present invention includes a pair of left and right inner plates, a cylindrical bush having both ends press-fitted to the inner plate, and a pair of left and right outer plates disposed on both outer sides of the inner plate. And a chain that is rotatably inserted into the bush and has both end portions press-fitted to the outer plate, and a chain in which a large number of the inner plate and the outer plate are alternately connected. The connecting pin is formed in a shape in which the diameter of the central portion in the longitudinal direction is larger than the diameter of both ends, so that when the connecting pin is bent due to the tensile force acting on the chain, the contact portion with the inner peripheral surface of the bush Is almost linear, the tensile force applied to the inner peripheral surface of the bush and the outer peripheral surface of the connecting pin can be made uniform in the longitudinal direction of the connecting pin, preventing chain wear, elongation or damage, Noisy It is possible to provide a small chain of power transmission loss with reducing and vibration.

  And, in addition to the effect of the chain according to claim 1, the chain according to the present invention according to claim 2 has the cylindrical bush that has a roller rotatably fitted on its outer periphery. Since the contact resistance with the sprocket on which the wire is wound is reduced, and the inner peripheral surface of the bush uniformly contacts the pin along the inclination based on the bending of the pin, further preventing the chain from being worn, stretched or damaged, It is possible to provide a chain that reduces noise and vibration and has less power transmission loss.

  The chain of the present invention includes a pair of left and right inner plates, a cylindrical bush having both ends press-fitted to the inner plate, a pair of left and right outer plates disposed on both outer sides of the inner plate, and the bush. In a chain in which both ends are configured to be rotatably inserted and are press-fitted to the outer plate, and the inner plate and the outer plate are alternately connected in a chain, the connecting pin is long The diameter of the central part in the direction is formed to be larger than the diameters at both ends, preventing chain wear, elongation, damage, etc., and reducing noise and vibration and providing a chain with less power transmission loss. Any specific embodiment may be used as long as the above effect is exhibited.

Below, the chain of this invention is demonstrated based on drawing.
FIG. 1 is a perspective view of a chain of the present invention, FIG. 2 is a cross-sectional view of the chain of the present invention, and FIG. 3 is a cross-sectional view when a tensile force is applied to the chain of the present invention.

First, as shown in FIG. 1, the chain 100 according to the embodiment of the present invention is configured by connecting a large number of inner links 110 and outer links 120 alternately.
The inner link 110 includes a pair of inner plates 111 each having two bushing holes 113, and two cylindrical bushings 112 having both ends fitted and fixed to the bushing holes 113 of the pair of inner plates 111, respectively. The roller 114 is rotatably fitted around the bushes 112.
The diameter of the inner periphery of the cylindrical bush 112 is configured uniformly in the axial direction.
The outer link 120 includes a pair of outer plates 121 each having two pin holes 123 and two connecting pins 122 each having both ends fitted and fixed to the pin holes 123 of the pair of outer plates 121. The
A large number of inner links 110 and outer links 120 are connected alternately by inserting connecting pins 122 into a cylindrical bush 112 in a rotatable manner.

  As shown in FIG. 2, the connecting pin 122 is formed in a barrel shape in which the diameter rl at the center is larger than the diameter rs at both ends, and the diameter smoothly changes between them. On the other hand, the inner diameter rb of the cylindrical bush 112 is larger than the diameter rl of the central portion of the connecting pin 122, and the connecting pin 122 is rotatably inserted into the bush 112.

The operation of the chain 100 according to the embodiment of the present invention configured as described above will be described below.
First, when the tensile force is small, as shown in FIG. 2, the connecting pin 122 hardly bends, and the inner peripheral surface of the bush 112 and the outer peripheral surface of the connecting pin 122 are portions of a diameter rl at the center of the connecting pin 122. Only contact and transmit the tensile force.
At this time, since the tensile force is small, the inner peripheral surface of the bush 112 and the outer peripheral surface of the connecting pin 122 are less likely to wear at the contact portion, and problems such as wear, elongation or damage as a whole of the chain 100 do not occur. And vibration is small.

On the other hand, when the tensile force is large, as shown in FIG. 3, the connecting pin 122 bends, the contact portion between the inner peripheral surface of the bush 112 and the connecting pin 122 becomes substantially linear, and the inner peripheral surface of the bush 112 and the connecting pin The outer peripheral surface of 122 contacts in the entire longitudinal direction.
At this time, although the tensile force is large, it is equally distributed in the longitudinal direction of the connecting pin 112, and the inner peripheral surface of the bush 112 and the outer peripheral surface of the connecting pin 122 are not locally worn, and the chain 100 as a whole Abrasion, elongation, breakage, etc. can be prevented, noise and vibration can be reduced, and the power transmission loss of the power transmission mechanism or the conveyance mechanism using the chain 100 can be reduced. .

Further, since the roller 114 is rotatably fitted to the bush 112, the roller 114 contacts the sprocket (not shown) while rotating, and the contact friction between the sprocket and the chain 100 is greatly reduced. As a whole, wear, elongation, breakage, and the like can be prevented, noise and vibration can be reduced, and power transmission loss of the power transmission mechanism or transport mechanism using the chain 100 can be reduced.
In addition, although the chain 100 of a present Example is a roller chain which has the roller 114, a bush chain which does not have a roller may be sufficient.

  The diameter rl at the center of the connecting pin 122 and the diameter rs at both ends may be optimally set according to the use conditions of the chain 100, the material and strength of each member, etc. What is necessary is just to set so that the contact part of the internal peripheral surface of the bush 112 and the connection pin 122 may become substantially linear at the time of the rated output of a conveyance mechanism.

  Further, even in the case of use conditions in which the tensile force frequently fluctuates, the bushing 112 is set so that the contact portion between the inner peripheral surface of the bushing 112 and the connecting pin 122 is substantially linear when an intermediate tensile force is applied. The position of the contact point between the inner peripheral surface of 112 and the connecting pin 122 changes corresponding to changes in the center, the whole, and the end of the connecting pin 122 and the tensile force, and the inner peripheral surface of the bush 112 and the outer periphery of the connecting pin 122. The effect is enormous, such as preventing the surface from being locally worn.

The perspective view of the chain of this invention. Sectional drawing of the chain of this invention. Sectional drawing at the time of the tensile force of the chain of this invention being added. The perspective view of the conventional chain. Sectional drawing of the conventional chain. Sectional drawing when the tensile force of the conventional chain is added.

Explanation of symbols

100, 500 ... Chain 110, 510 ... Inner link 111, 511 ... Inner plate 112, 512 ... Bush 113, 513 ... Bush hole 114, 514 ... Rollers 120, 520 ...・ External link 121,521 ... Outer plate 122,522 ... Connecting pin 123,523 ... Pin hole

Claims (2)

A pair of left and right inner plates, a cylindrical bush whose both ends are press-fitted to the inner plate, a pair of left and right outer plates disposed on both outer sides of the inner plate, and the bush are rotatably inserted. In the chain in which both ends are composed of connecting pins press-fitted to the outer plate, and the inner plate and the outer plate are alternately connected in a number of ways,
The chain characterized in that the connecting pin is formed in a shape in which the diameter of the central part in the longitudinal direction is larger than the diameters of both end parts.   The chain according to claim 1, wherein a roller is rotatably fitted on an outer periphery of the cylindrical bush.

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