JPH1061727A - Heat radiating chain - Google Patents

Abstract

PROBLEM TO BE SOLVED: To cool a slide surface, prevent lubricating oil from deteriorating and improve a chain life, by releasing heat generated in the slide surface between a connecting pin and a bush to the outside of a chain. SOLUTION: A heat radiating chain 10 is formed by internally mounting a connecting pin 13 and a bush 14 respectively in an outer/inner plate 11, 12 and inserting the connecting pin 13 into the bush 14. In a surface of the connecting pin 13, a coating layer 16 formed of material of heat conductivity higher than a material of a connecting pin main unit 15 is formed. General material of the connecting pin 13 is iron, but the coating layer 16 consists of material of heat conductivity higher than iron, for instance, aluminum, an aluminum alloy, a copper alloy of copper, brass, etc., gold, silver and zinc. Heat generated in a slide surface between the connecting pin 13 and the bush 14 is directly moved to the coating layer 16, mainly therethrough, by heat conductive transfer, moved to an end part of the connecting pin 13. Heat moved to an exposed surface of the connecting pin 13 and a surface of the outer plate 11 is released by heat convective transfer to the outside of the chain.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a chain in which a connecting pin and a bush are coaxially mounted on inner and outer plates, respectively, by efficiently discharging heat generated on a sliding surface between the connecting pin and the bush to the outside of the chain. The purpose of the present invention is to prevent deterioration of lubricating oil on the sliding surface and to improve the life of the chain.

[0002]

2. Description of the Related Art In a conventional chain, for example, a roller chain, a connecting pin is inserted into an inner plate and a bush is inserted into an outer plate, and the connecting pin is inserted into the bush. In this type of chain, lubricating oil is filled in the sliding surface of the connecting pin and bush, or the bush made of sintered metal is impregnated with lubricating oil to reduce the wear on the sliding surface and improve the life of the chain. Or

[0003]

However, since a considerable amount of heat is generated on the sliding surface between the connecting pin and the bush, there is a problem that the heat deteriorates the lubricating oil and significantly reduces the life of the chain. Lubricating oil is generally considered to reduce its performance by half only by raising its temperature by 10 ° C. In such a chain, how to release a large amount of heat generated on the sliding surface and release it in large quantities is a major issue. Become.

[0004]

The present invention first solves the above-mentioned problems by forming a coating layer made of a material having a higher thermal conductivity than the material of the connecting pin body on the surface of the connecting pin. It is. The heat generated on the sliding surface moves directly from the sliding surface through the coating layer on the connecting pin surface by conduction heat transfer, and the heat transferred to the exposed surface of the connecting pin and the outer plate surface is transferred to the outside of the chain by convective heat transfer. Released to In the case where the connecting pin is made of iron and is in the operating temperature range of a general chain, as a material having a higher thermal conductivity than the material, for example, aluminum, an aluminum alloy, copper,
There are copper alloys such as brass, gold, silver and zinc, and the coating layer is made from these materials.

[0005] Second, the present invention solves the above-mentioned problem by forming an axial hole in the connecting pin and filling the hole with a material having a higher thermal conductivity than the material of the connecting pin body. is there. The heat generated on the sliding surface is conducted and transferred to the material filled in the hole, and further moves through the filled material.The heat transferred to the exposed surface of the connecting pin and the surface of the outer plate is transferred by convection. The heat is released outside the chain. In addition, in order to increase the amount of heat transfer by conduction heat transfer, it is preferable to penetrate a hole formed in the connection pin in the axial direction,
A pair of holes that are not inserted into each other from both end surfaces of the connection pin may be formed. In this case, it is preferable that the hole is extended to the inside of the inner plate so that the heat generated on the sliding surface is quickly transferred to the filled material. Also, the number of perforated holes is not necessarily one. Two or more holes parallel to each other in the axial direction may be formed.

Thirdly, the present invention is characterized in that a hole is formed in the connection pin in the axial direction, and a coating layer made of a material having a higher thermal conductivity than the material of the connection pin body is formed on the surface of the hole. This is to solve the above problem. The heat generated on the sliding surface is conducted and transferred to the coating layer inside the connecting pin,
The heat transferred through the coating layer and transferred to the exposed surface of the connecting pin and the surface of the outer plate is released to the outside of the chain by convective heat transfer. Further, since the coating layer is in contact with a medium such as air around the chain, convective heat transfer occurs between the coating layer and the medium on the surface of the coating layer. Note that, in order to increase the amount of heat transfer by conduction heat transfer, it is preferable that the holes formed in the connection pin are axially penetrated, but a pair of holes that are not inserted from both end surfaces of the connection pin may be formed. . In this case, it is preferable that the hole is extended to the inside of the inner plate so that the heat generated on the sliding surface is quickly transferred to the filled material. Similarly, convection of the medium around the chain in contact with the coating layer is promoted by axially penetrating the perforated holes. Therefore, the temperature difference between the coating layer and the medium increases, the amount of heat transfer by convective heat transfer increases, and the sliding surface can be efficiently cooled. Also, the number of perforated holes is not necessarily one. Two or more holes parallel to each other in the axial direction may be formed.

Fourth, the present invention solves the above-mentioned problem by providing a connecting pin with a heat radiating portion extending in the axial direction from the outer plate. The heat generated on the sliding surface moves from the connecting pin to the radiator. By providing the heat radiating portion, the surface area of the chain surrounding the medium such as air increases, the amount of heat transfer by convective heat transfer increases, and the heat radiating portion is efficiently cooled. Therefore, the temperature difference between the vicinity of the sliding surface of the connecting pin and the heat radiating portion is increased, the amount of heat transfer by the conductive heat transfer through the connecting pin is increased, and the sliding surface is efficiently cooled. In addition, the heat radiating part may be one in which the connecting pin is simply extended as it is, but in order to increase the contact area with the medium around the chain, the heat radiating part has a radial hole, an axial hole, an axial slit or Preferably, an annular slit is provided. It is also preferable to increase the diameter of the heat radiating portion to increase the contact area with the medium.

Fifth, the present invention solves the above-mentioned problem by forming a coating layer made of a material having a higher thermal emissivity than the material of the connecting pin body on the end face of the connecting pin.
The heat generated on the sliding surface moves to the end surface through the connecting pin. The heat that has moved to the end face is also released to the outside of the chain by radiant heat transfer. Therefore, the temperature difference between the vicinity of the sliding surface and the vicinity of the end surface of the connecting pin is increased, the amount of heat transfer by the conductive heat transfer through the connecting pin is increased, and the sliding surface is efficiently cooled. In the case where the connecting pin is made of iron and the operating temperature range of a general chain is higher, the material having a higher thermal emissivity than the material is, for example, brass, nichrome, etc., and a coating layer may be formed from these materials. preferable. Also,
It is preferable to make the end face of the connecting pin a black body to increase the amount of heat transfer by radiant heat transfer.

[0009]

FIG. 1 shows a first embodiment of a heat radiation chain according to the present invention. The heat dissipation chain 10 includes an outer plate 11
Connecting pin 13 and bush 1 on inner plate 12 respectively.
4 is inserted, and the connecting pin 13 is inserted into the bush 14. A coating layer 16 made of a material having a higher thermal conductivity than the material of the connection pin body 15 is formed on the surface of the connection pin 13. The general material of the connecting pin 13 is iron,
The coating layer 16 is made of a material having a higher thermal conductivity than iron, for example, aluminum, an aluminum alloy, copper, a copper alloy such as brass,
It consists of gold, silver and zinc. The coating layer 16 is formed by plating, thermal spraying,
It is formed by painting, coating or the like.

The heat radiation in the chain 10 is performed as follows. When the chain bends, the connecting pin 13
Then, heat is generated on the sliding surface of the bush 14. Coating layer 1
6 forms one of the sliding surfaces, the heat generated on the sliding surface moves directly to the coating layer 16 and mainly to the end of the connecting pin 13 through the coating layer 16 by conduction heat transfer.
Then, the heat transferred to the exposed surface of the connecting pin 13 and the surface of the outer plate 11 is released to the outside of the chain by convective heat transfer. Therefore, heat generated on the sliding surface is quickly released to the outside of the chain, so that deterioration of the lubricating oil on the sliding surface is reduced, and the life of the chain can be improved.

Although the inner and outer plates and bushings can be made of iron and the entire connecting pin 13 can be made of a material such as aluminum, it is disadvantageous in terms of strength for a chain operated with a large traction force. It is preferable to form a coating layer made of a different material on a part of the connecting pin as described above.

FIG. 2 shows a second embodiment of the heat dissipation chain according to the present invention. In the heat dissipation chain 20 of the present embodiment, an axial through-hole 24 is formed in an iron connecting pin 23, and the hole 24 is filled with a material having a higher thermal conductivity than the material of the connecting pin body 25. The material is aluminum or the like as in the first embodiment. Therefore, the heat generated on the sliding surface moves to the end portion by conduction heat transfer through the inside of the connection pin 23, and then moves to the exposed surface of the connection pin 23 and the surface of the outer plate 21, and the outside of the chain is generated by convection heat transfer. Released to

Although the hole 24 is preferably penetrated in the axial direction, a pair of holes that do not pass through each other from both ends of the connecting pin may be formed. In this case, it is preferable that the hole is extended to the inside of the inner plate so that the heat generated on the sliding surface is quickly transferred to the filled material.
Further, the number of holes 24 is not necessarily one. Two or more holes arranged in parallel in the axial direction may be formed, and the holes may be filled with a material having higher thermal conductivity than the connecting pin body.

In the second embodiment, the hole is filled with a material having a higher thermal conductivity than the material of the connecting pin body. However, a coating layer made of the same material may be formed in the hole. In this case, in addition to increasing the amount of heat transfer due to conduction heat transfer from the sliding surface to the exposed surface of the connecting pin and the surface of the outer plate, the distance between the connecting pin and a medium such as air or water around the chain can be increased. The amount of heat transfer by convective heat transfer generated in the step can be increased. That is, since the coating layer is formed in the perforated hole, the contact area with the medium is increased, the amount of heat transfer by convective heat transfer is increased, and more heat can be released from the sliding surface to the outside of the chain.

FIG. 3 shows a third embodiment of the heat radiation chain according to the present invention. In the heat radiation chain 30 of the present embodiment, a heat radiation part 34 protruding in the axial direction from the outer plate 31 is extended from the connection pin 33. By extending the heat radiating portion 34 to the connecting pin 33, the surface area for generating convective heat transfer increases, and the amount of heat transfer between the heat radiating portion 34 and the medium around the chain increases. Therefore, the temperature difference between the vicinity of the sliding surface of the connecting pin 33 and the heat radiating portion 34 increases, and the amount of heat transferred by the conductive heat transmitted through the connecting pin 33 increases, so that the sliding surface is efficiently cooled.

The heat dissipating portion 34 shown in FIG. 3 is formed by extending the connecting pin 33 in the axial direction as it is. However, the heat dissipating portion 34 has a large contact area with the medium around the chain to increase the amount of heat transfer by convective heat transfer. In addition, a radial hole or an axial hole may be formed in the heat radiating portion, or an axial slit or a circumferential annular slit may be provided. For the same reason, the diameter of the heat radiating portion 34 may be increased to increase the contact area with the medium.

FIG. 4 shows a fourth embodiment of the heat dissipation chain according to the present invention. In the heat dissipation chain 40 of the present embodiment, a coating layer 45 made of a material having a higher thermal emissivity than the material of the connection pin main body 44 is formed on the end face of the connection pin 43. After the heat generated on the sliding surface moves to the coating layer 45 through the connecting pin 43, the heat is released to the medium around the chain by convective heat transfer and also to the outside of the chain by radiant heat transfer. When the chain is made of iron, a suitable material for the coating layer 45 is brass, nichrome, or the like. Also, in order to increase radiant heat transfer by black body radiation,
It is preferable to make the surface of the coating layer made of the above material dark.

In the above embodiments, individual inventions have been described in detail. However, by combining each invention, the sliding surface can be more efficiently cooled. For example, when a brass coating layer is formed on the inner and outer surfaces and end surfaces of the hollow connecting pins, and the ends of the connecting pins are projected from the outer plate, and the exposed surfaces of the connecting pins projecting from the outer plate are colored black, the conductive It exhibits excellent characteristics in heat transfer, convection heat transfer and radiation heat transfer, and has a remarkable sliding surface cooling effect.

[0019]

According to the first aspect of the present invention, since a coating layer made of a material having a higher thermal conductivity than the material of the connecting pin body is formed on the surface of the connecting pin, the heat generated between the connecting pin and the bush is reduced. It moves directly and quickly to the end of the connecting pin through the coating layer on the connecting pin surface, moves to the exposed surface of the connecting pin and the surface of the outer plate, and is released to the air around the chain by convective heat transfer. Therefore, the release of the heat generated on the sliding surface is promoted, so that the deterioration of the lubricating oil on the sliding surface is prevented, and the life of the chain can be improved. As a result, the chain can be used under more severe use conditions, or an economical lubricating oil can be used.

According to the second aspect of the present invention, an axial hole is formed in the connecting pin, and the hole is filled with a material having a higher thermal conductivity than the material of the connecting pin body. The generated heat moves to the end of the connecting pin through the filling material inside the connecting pin, moves to the exposed surface of the connecting pin and the surface of the outer plate, and is then released to the air around the chain by convective heat transfer. As a result, the chain of the present invention has the effect of improving the service life of the chain as in the above-described invention. Also,
The chain of the present invention is advantageous in terms of strength because the sliding surface can be formed from the same iron as a general chain material.

According to a third aspect of the present invention, an axial hole is formed in the connecting pin, and a coating layer made of a material having a higher thermal conductivity than the material of the connecting pin body is formed on the surface of the hole. The heat generated between the bush and the bush moves to the end of the connecting pin through the coating layer on the surface of the axial hole, and then to the exposed surface of the connecting pin and the surface of the outer plate. Etc. are released. As a result, the chain of the present invention has the effect of improving the service life of the chain as in the above-described invention. Further, the present invention is advantageous in terms of strength because the sliding surface can be made of the same iron as a general chain material. Furthermore, the chain of the present invention has a large contact area between the coating layer and the air around the chain, so that the amount of heat transferred to the outside of the chain by convective heat transfer increases, further improving the cooling effect on the sliding surface. Can be done.

According to the fourth aspect of the present invention, since the heat radiating portion extending in the axial direction from the outer plate is extended to the connecting pin, the heat generated between the connecting pin and the bush is transferred to the end portion through the connecting pin. After the movement, it moves to a heat radiating portion having a large contact area with the periphery of the chain, and is discharged from the heat radiating portion to a large amount of air or the like around the chain by convection heat transfer. As a result, the temperature difference between the vicinity of the sliding surface of the connecting pin and the heat radiating portion increases, and the sliding surface is cooled, so that deterioration of the lubricating oil on the sliding surface is prevented, and the life of the chain can be improved. it can.
Thus, the chain can be used under more severe use conditions, or an economic lubricating oil can be used.

According to the fifth aspect of the present invention, since a coating layer made of a material having a higher thermal emissivity than the material of the connecting pin main body is formed on the end face of the connecting pin, heat generated between the connecting pin and the bush can be conducted by conduction. After being moved to the end face of the connecting pin through the connecting pin by heat, it is released to the air around the chain by convective heat transfer, and is also emitted to the outside of the chain by radiant heat transfer from the coating layer having a high thermal emissivity. Therefore, since the sliding surface is cooled, the deterioration of the lubricating oil on the sliding surface is prevented, and the life of the chain can be improved. As a result, the chain can be used under more severe use conditions, or an economical lubricating oil can be used.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a first embodiment of a heat dissipation chain according to the present invention.

FIG. 2 is a cross-sectional view showing a second embodiment of the heat dissipation chain according to the present invention.

FIG. 3 is a cross-sectional view showing a third embodiment of a heat dissipation chain according to the present invention.

FIG. 4 is a sectional view showing a fourth embodiment of a heat dissipation chain according to the present invention.

[Explanation of symbols]

 10, 20, 30, 40 Heat dissipation chain 11, 21, 31 Outer plate 12 Inner plate 13, 23, 33, 43 Connecting pin 14 Bush 16 Coating layer 34 Heat dissipating part 45 Coating layer

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Tsutomu Iwami 4-17-96, Tsurumi, Tsurumi-ku, Osaka City, Osaka Inside Tsubakimoto Chain Co., Ltd.

Claims (5)

[Claims] 1. A chain in which a connecting pin and a bush are coaxially mounted on an inner and outer plate, respectively, wherein a coating layer made of a material having a higher thermal conductivity than a material of the connecting pin body is formed on a surface of the connecting pin. Heat dissipation chain. 2. In a chain in which a connecting pin and a bush are coaxially loaded into an inner and outer plate, respectively, an axial hole is formed in the connecting pin, and the hole has a thermal conductivity higher than that of the material of the connecting pin body. Heat dissipation chain filled with expensive materials. 3. In a chain in which a connecting pin and a bush are coaxially mounted on an inner and outer plate, respectively, an axial hole is formed in the connecting pin, and the surface of the hole is heat-conductive from the material of the connecting pin body. A heat dissipation chain with a coating layer made of a highly efficient material. 4. A heat dissipating chain in which a connecting pin and a bush are coaxially mounted on inner and outer plates, respectively, wherein a heat dissipating portion protruding axially outward from the outer plate is extended on the connecting pin. 5. A chain in which a connecting pin and a bush are coaxially mounted on inner and outer plates, respectively, wherein a coating layer made of a material having a higher thermal emissivity than a material of the connecting pin body is formed on an end face of the connecting pin. Heat dissipation chain.