JPH0155820B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention improves heat dissipation by forming a joint shaft passing through a synthetic resin bushing using a highly thermally conductive material. The present invention relates to a chain that can reduce wear on the sliding part between a bush and a joint shaft and improve the durability of the chain.

[Conventional technology]

Chains used in food, textile, chemical industries, etc.
Furthermore, in sewage treatment chains, etc., bushings made of synthetic resin are used not only for conveyance but also for power transmission in order to prevent the chain from becoming dirty due to rust or to improve the corrosion resistance of the chain itself. used.

However, in such a conventional chain, the joint shaft that passes through the bush and sequentially connects the link plates is formed as a solid pin-shaped body made of steel such as stainless steel or synthetic resin.

On the other hand, in the chain, the bush and the joint shaft rotate and slide relative to each other due to bending due to vibrations caused by running under tension or bending when meshing with a chain wheel. Moreover, the sliding portion generates heat due to the sliding movement.

[Problem that the invention seeks to solve]

The heat generated in such sliding parts is dissipated through the bushing surface, joint shaft, etc. However, in the conventional chains mentioned above, steel materials etc. were used for the joint shaft, so thermal conductivity was low, and the sliding parts It has poor dissipation properties for the heat generated, and the sliding parts tend to reach high temperatures.
Therefore, bushings made of synthetic resin are affected by heat, which causes softening and other problems, resulting in a decrease in mechanical properties and accelerated wear. Another problem was that the durability of the chain itself was reduced due to deterioration of mechanical properties.

The present invention improves the heat dissipation of the joint shaft passing through a synthetic resin bushing, thereby reducing the temperature of the sliding part and preventing deterioration of mechanical properties.
The purpose of the present invention is to provide a chain that can solve the above-mentioned problems by improving the wear life and increasing the durability of the chain.

[Means for solving problems]

Hereinafter, one embodiment of the means of the present invention capable of achieving the above-mentioned objects and solving the problems will be described with reference to the drawings.

In the figure, a chain 1 is connected to first link plates 3A, 3B by a bush 2 made of synthetic resin.
The first link 4 formed by combining the two links, and the second link 7 having second link plates 5A, 5B and arranged alternately with the first link 4, have a higher thermal conductivity than steel. The bushings are made of a material with a high ratio and are connected using joint shafts 9 that pass through the bushing 2.

In this embodiment, offset link plates bent in a substantially Z-shape are used as the first and second link plates 3A, 3B, 5A, and 5B, and each of the first link 4 and the second link 7 is
By molding the first link plates 3A, 3B, the second link plates 5A, 5B, and the bushings 2, respectively, integrally and in the same shape, their connection forms a so-called pintle chain.

The first link plates 3A, 3B are connected to the bushing 2.
Outer piece portions 2 parallel to the inner piece portions 21 are inserted into the inner piece portions 21 on both sides through inclined portions 22 that are bent obliquely outward.
The inner piece part 21 is provided with a through hole 25 passing through the bushing, and the outer piece part 23 is also provided with a through hole 25 which passes through the bushing.
A through hole 26 separating the link plate 5 and the chain pitch is formed facing each link plate 3A, 3B.

The outer piece 23 is provided with surrounding walls 27 and 29 along its outer surface and outer edge, and the surrounding walls 27 and 29
includes a stay 30 along the outer edge of the inclined portion 22,
30 are installed in a row. Further, the surrounding wall 27 of the link plate 3A has a recess 31 with a larger diameter than the through hole 25 formed therein, and the surrounding wall 29 of the link plate 3B has a recess 34 having an occluded locking part 33. are doing. Also, the first link plates 3A, 3
B. By integrally molding the bushing 2 using synthetic resin, the bushing 2 can connect the first link plates 3A and 3B on both sides, and the bushing 2
will be formed using synthetic resin. Examples of synthetic resins include polyamide resins such as nylon, Diyuracon (product name), and Delrin (product name).
Various engineering plastics such as polyacetal resins such as PEEK (polyether ether ketone) resins can be used, and in addition to the thermoplastic resins mentioned above, thermosetting resins can also be used for molding. In addition to metal pieces, metal fibers, inorganic fibers such as glass fibers, carbon fibers,
The tensile strength can also be improved by inserting organic fibers such as synthetic resin fibers.

The first link 7 has the same shape as the first link 4 as described above, and the length L1 between the outer surfaces of the inner pieces 21, 21 is slightly longer than the distance L2 between the inner surfaces of the outer pieces 23, 23. Formed narrowly. Therefore, the inner pieces 21, 21 at both ends of the bushing 2 of the first and second links 4, 7 arranged alternately are connected to the adjacent links 4.
or 7, and the outer piece 23 has through holes 25, 26 on the outside of each inner piece 21.
are arranged by aligning them. In addition, by inserting the joint shaft 9 through the aligned through holes 25 and 26, the first and second links 4 and 7 are connected to form a series of chains 1.

The joint shaft 9 has a solid pin shape, and has a notch-shaped circumference that can be loosely fitted into the recess 34 and engaged with the locking part 33 at one end of the body part 36 that fits loosely into the through holes 25 and 26. A flange 39 having a stop 37 is provided. Further, at the other end, there is a tapered guide portion 4.
0 is provided and a retaining ring 41 is provided at the base of the retaining ring 41.
A circumferential groove 42 for fitting is recessed.

The joint shaft 9 is made of a material such as aluminum, copper, nickel, or brass that has a higher thermal conductivity than steel materials such as carbon steel or stainless steel. The thermal conductivity (Kcal/mh℃) is 37,18Cr- for 0.5% carbon steel.
8Ni stainless steel has a thermal conductivity of 14, while aluminum has a thermal conductivity of 196, copper has a thermal conductivity of 332, 99.9% nickel has a thermal conductivity of 77, nickel has a thermal conductivity of 96, and Shichisan brass has a thermal conductivity of 95. In other words, it refers to a metal having a thermal conductivity (Kcal/nh°C) of over 40, preferably over 50. The joint shaft 9 should preferably be made of a non-rust material, and if a rust-prone material is used, the surface should be treated. By cladding or thermal spraying a large copper metal, a relatively thick copper coating layer is formed on the surface, creating a double structure, which can improve overall heat conductivity compared to steel. can. As shown in FIGS. 1 and 2, while the rotation stopper 37 and the locking part 33 are engaged, the flange 39
is fitted into the recess 34 and the body 36 is inserted into the through holes 25, 26.
Insert into. Further, in the recess 31, a collar 46 is interposed, and a retaining ring 41 is attached to the circumferential groove 42. Therefore, the joint shaft 9 is held by the second link plates 5A, 5B, and connects the adjacent first and second links 4, 7.

Further, the rotation stopping portion 37 and the locking portion 33 prevent the joint shaft 9 from rotating, thereby preventing wear caused by free movement.

[Effect]

Therefore, in this embodiment, the chain 1 includes the first,
By forming the second links 4 and 7 from synthetic resin and by forming the joint shaft 9 from a corrosion-resistant material, the corrosion-resistant performance of the chain can be improved. It can be used as a corrosion-resistant chain.
In addition, since the joint shaft 9 is made of a material with higher thermal conductivity than steel, even when the sliding part generates heat due to bending between the bush 2 and the joint shaft 9, the joint shaft Heat can be radiated through the bushing 9, and the bushing 2 can be prevented from becoming too hot. As a result, the mechanical performance of the bushing 2 can be maintained, its deterioration can be prevented, wear is reduced, and chain life and durability are improved.

〔Example〕

4 and 5 show another embodiment of the present invention, in which the first and second link plates 3, 5 are not integrally formed but are formed as an assembly.
Note that the bushing 2 can be made of synthetic resin, and the first and second link plates 3 and 5 can be molded using appropriate metal, synthetic resin, or the like. Further, in this example, the joint shaft 9 is prevented from coming off using a T pin 57.

6 and 7 show another embodiment of the present invention in which the chain 1 is in the form of a roller chain, in which first link plates 3A and 3B made of metal or the like are connected by a bushing 2 made of synthetic resin. Link 4
and a second link 7 having second link plates 5A, 5B disposed on the outside of the first link plates 3A, 3B at both ends of the bushing 2, are connected using a joint shaft 9. In addition, a roller 59 is loosely fitted into the bush 2. The joint shaft 9 has a flange 39 at one end, and the other end bulges outward after insertion to prevent the second link plates 5A, 5B from coming off. The other end may be bulged outward by caulking when metal is used, or by welding when synthetic resin is used to form the joint shaft 9.

〔Effect of the invention〕

In this way, the chain of the present invention connects the first link to which the first link plate is connected using a bushing made of synthetic resin, and the second link arranged alternately with the first link. Since the connection is made using a joint shaft that passes through the bush and is made of a material with better thermal conductivity than steel, the heat generated in the sliding part between the bush and the joint shaft can be easily dissipated. As a result, it is possible to prevent the bush from increasing in temperature, prevent deterioration of the bush's mechanical properties and sliding properties, prevent wear, and improve chain life and durability. In addition, since the bushing is made of synthetic resin, it is useful for reducing the weight and cost of the chain, as well as improving corrosion resistance and making it versatile for uses such as sewage treatment. Further, as shown in the above embodiments, the chain can be formed as a pintle chain, a roller chain, a bushed chain, or any other type of transmission or conveyor chain, and various attachments can also be attached to the chain.

[Brief explanation of drawings]

Fig. 1 is a partially sectional plan view showing one embodiment of the present invention, Fig. 2 is a front view thereof, Fig. 3 is an exploded perspective view showing one link, and Fig. 4 is a plan view of another embodiment of the present invention. A front view showing an embodiment, FIG. 5 is a partially sectional plan view, and FIG. 6 is a front view showing another embodiment.
FIG. 7 is a partially sectional plan view. 2... Bush, 3A, 3B... First link plate, 4... First link, 5A, 5B... Second link plate, 7... Second link, 9...
...Joint axis.

Claims (1)

[Claims] 1. A first link formed by connecting first link plates on both sides with a bushing made of synthetic resin;
a second link plate disposed on each outer side of the first link plate at both ends of the bushing, and a second link arranged alternately with the first link; A chain that is held by plates, is made of a material with higher thermal conductivity than steel, and is connected using a joint shaft that passes through the bushing.