JPH0537077Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial field of application] The present invention provides a sealing ring between two link plates or between a link plate and a roller, thereby sealing the gap between a pin, a bush, or a roller. , relates to a chain that can prevent dust from entering gaps between bushings.

[Conventional technology]

For example, in a chain operated in a dusty atmosphere, the pin that forms the bent part of the chain,
Dust enters between the bushes through the gap between the two link plates, accelerating wear on the sliding surfaces thereof.

In order to prevent such dust from entering, there are some devices in which a ring-shaped seal is interposed in the gap, but the seal is made of a soft material to maintain airtightness. However, when a force acting from the side of the chain is applied to such a seal,
There is a problem in that the seal is compressed and destroyed due to this action. To solve this problem, as shown in Figure 9, the end d of the bushing c is made to protrude into the gap g between the inner and outer link plates a and b, so that when a lateral load is applied to the chain, the end d of the bushing c It has been proposed that the seal d is brought into contact with the outer link plate b to prevent the seal e from being destroyed.

[Problem that the invention attempts to solve]

However, in such a structure, the end surfaces of the outer link plate b and the bush c rotate while being in contact with each other, which accelerates wear of the contact surfaces and reduces the strength of the outer link plate b. Other link plate b
The end portion d bites into the seal e.
The amount of compressed air becomes large, and there is a risk that the seal e may be destroyed. Incidentally, dust tends to enter the gap between the bush c and the roller f through the gap between the inner link plate a and the end face of the roller f, and therefore, the above-mentioned problem exists.

The present invention is based on interposing a seal ring with a lip around the gap between two link plates or between a link plate and a roller, so that the gap can be sealed and the force acting from the lateral direction of the chain can be applied. The purpose of the present invention is to provide a chain that can operate smoothly even when the load is applied and can improve the durability of the chain.

[Means for solving problems]

Hereinafter, an embodiment of a device capable of achieving the above-mentioned objects and solving the problems will be explained based on the drawings.

In FIGS. 1 to 4, the chain 1 has a first gap g1 where the outer surface 3 of the link plate 2 and the inner surface 5 of the link plate 4 face each other, or the link plate 4
The second gap g2 between the inner surface 6 of the roller 7 and the end surface 9 of the roller 7
A seal ring 10 is interposed therebetween.

In this embodiment, the chain 1 is a roller chain, and the bushes 11, 11 are inserted into a pair of through holes formed in the link plates 2, 2, which are opposed to each other, with a pitch gap therebetween, to form an inner link. .
Accordingly, in this example, the link plates 2 connected by the bushing 11 are formed as inner link plates 21.

Further, the link plates 4, 4 are provided with the bushes 11, 11 in a pair of through holes formed on the outside of each of the inner link plates and abutted across a pitch gap.
The outer links are formed by fitting the tips of the pins 12 through each of the outer links. Therefore, in this example, the link plate 4 connected by the pin 12
is formed as an outer link plate 22.

Further, a roller 7, which is fitted onto the bush 11, is interposed between the opposing inner surfaces 6, 6 of the inner link plates 21, 21.

There is a first gap g1 between the outer surface of the inner link plate 21 and the inner surface 5 of the outer link plate 22.
The first gap g1 is electrically connected to the gap between the inner hole of the bushing 11 and the pin 12. Further, a second gap g2 is interposed between the inner surface 6 of the inner link plate 21 and the end surface 9 of the roller 7, and the second gap g2 is between the hole of the roller 7 and the outer peripheral surface of the bushing 11. Leads to the gap.

Further, in this embodiment, the first seal ring 10A is interposed in the first gap g1, and the first seal ring 10A is interposed in the first gap g1.
A second seal ring 10B having substantially the same configuration as the seal ring 10A is also interposed in the second gap g2.

The first seal ring 10A has a pin 12 in the center.
An annular base 13 provided with a hole 24 into which the
and a cone portion 14 around the base portion 13.
In this example, the seal ring 10A is attached to the base 13.
and the cone portion 14 are integrally formed by molding an elastic material or the like. The elastic material used is, for example, a synthetic resin material such as 66 nylon or urethane rubber, which has high compressive strength and elastic elongation and low sliding friction resistance.

The base 13 has an annular washer shape and has both sides 25 and 26.
are finished almost parallel.

The cone portion 14 extends from the outer edge of the base portion 13 toward its outer circumference, is inclined toward the side surface 26, and has a dish-shaped washer shape whose thickness gradually decreases toward the outer edge. Further, a lip portion 15 is provided around the outer edge of the cone portion 14 in the direction of inclination of the cone portion 14, that is, in the direction of the side surface 26. The lip portion 15 is designed to close the first gap g1 even if the first gap g widens due to the axial displacement of the pin 12 by the inner link plate 21 or the outer link plate 22. The amount of protrusion of the lip portion 15 is determined.

In this example, the lip portion 15 is formed into a pointed shape that tapers toward the tip, and is elastically deformed by contacting the tip and comes into airtight contact with the contact surface. The seal ring 10A is fitted into the first gap g1 by abutting the inner surface 5 of the outer link plate 22 and contacting the lip portion with the outer surface 3 of the inner link plate 21, and loosely fitting the pin 12 into the hole 24. Ru.
By fitting the first seal ring 10A, the gap between the pin 12 and the bush 11 is blocked from communicating with outside air, and dust can be prevented from entering the gap. Furthermore, a lubricant such as grease is filled in a space F formed between the inner side surface 26 of the lip portion 15 and the outer surface 3.

Note that the first seal ring 10A is installed in the opposite direction to that described above, that is, with the side surface 25 facing the inner link plate 21.
It is also possible to fit into the first gap g1 such that the lip portion 15 contacts the inner surface 5 of the outer link plate 22. Therefore, the inner surface 5 of the outer link plate 22 is located in the first gap g1.
Alternatively, a first seal ring 10A may be interposed that contacts the outer surface 3 of the inner link plate 21, contacts the lip portion 15 on the other surface, and has the pin 12 inserted therethrough.

The second seal ring 10B has a bush 1 in the center.
The lip portion 15 is brought into contact with the end surface 9 of the roller 7 and the bushing 1
1 and is inserted into the second gap g2. Note that the second seal ring 10B can also be fitted by bringing the rib portion 15 into contact with the inner surface 6 of the inner link plate 21. Therefore, the bush 11 is placed in the second gap g2.
At the same time, a seal ring 10B can be interposed, which abuts one surface of the inner surface 6 of the inner link plate 21 or the end surface 9 of the roller 7, and has the lip portion 15 in contact with the other surface.

[Effect]

Thus, the chain 1 can be smoothly bent when meshing with the sprocket wheel while maintaining contact with the surfaces facing the gaps g1 and g2, and the rollers 7 can easily roll on the rails and the like.

Furthermore, the gap between the pin 12 and the bush 11 of the chain 1 and the gap between the roller 7 and the bush 11 are formed by the first and second gaps g1 and g2, respectively, by the seal ring 10.
Since the openings are closed by 10A and 10B, dust can be prevented from entering and each sliding surface is protected.

By storing the lubricant in the space F, the sliding surface can be lubricated for a long period of time.

Furthermore, by applying a lateral load to the chain 1, the inner and outer link plates 21, 2
2 or the roller moves in the axial direction of the pin 12, as shown in FIG. By pressing and deforming and retracting the lip part 15, the base part 13 comes into contact with the side surface 26 facing the lip part 15, and supports the lateral acting force applied to the chain 1. The base portion 13 is larger than the contact surface of the lip portion 15 and can receive a large acting force. In addition, the first on the opposite side,
In the second gaps g1 and g2, the lip portion 15 and its contact surface always maintain contact with each other and maintain airtightness inside the lip portion 15, regardless of the size of the gap being enlarged.

〔Example〕

As shown in FIG. 5, the reel ring 10 has a washer-like base plate 34 along the side surface 25 on the opposite side of the lip part 15, and a flange part 35 that surrounds the cone part 14 and protrudes toward the lip part 15 side. At the same time, a movement limiter 36 may be attached so that the tip of the flange portion 35 is slightly held back toward the side surface 26 on the lip portion 15 side. The movement limiter 36 can prevent the base portion 13 from being destroyed by extreme compression due to advancement of the surface with which the lip portion 13 contacts.

Further, as shown in FIG. 6, the seal ring 10 can also be formed by forming the base portion 13 of a hard elastic material and the cone portion 14 of a relatively soft elastic material. A spring plate may be interposed.

FIG. 7 shows another embodiment of the invention, in which the chain 1 is formed as an offset chain.

In the link plate 41, the link plate 2 and the bush 11, which are connected by the bush 11 via a step substantially equal to the plate thickness of the link plate 41, are combined as one body.

In this example, the plate 41 into which the bush 11 is inserted at one end is bent into a Z-shape with a step, and the pin 12 arranged at a pitch interval from the bush 11 is inserted into the other end. At the same time, a pin of a link plate 41 adjacent to the bush 11 is inserted, and the one end of the link plate 41 is provided with a roller that is fitted onto the bush 11. The link plate 41 connects the link plate 2 and the link plate 2 connected by the bushing 11.
The link plate 4 is formed integrally with the link plate 4, which is connected by a pin 11 disposed on the outside of the link plate 4. In this example, the seal ring 10 is interposed only in the first gap g1 where the outer surface 3 of the link plate 2 and the inner surface of the link plate 4 face each other.

As shown in FIG. 8, when a bulge 8 is present at the end of the roller 7, the base 13 of the second seal ring 10B is inserted through the bulge 8 and the side surface 9 of the roller is inserted. It can also be brought into contact with.

In this way, the chain of the present invention can be modified in various ways, and the seal ring can be adjusted to the first gaps g1, g2.
It is also possible to intervene in both or only one of them.

[Effect of idea]

As described above, in the chain of the present invention, a pin or bushing is inserted into the first gap between the link plates or the second gap between the link plate and the roller, and the pin or bushing is in contact with one side of the gap and the other side. A seal ring made of elastic material with a contacting lip is inserted to prevent dust from entering the gaps between pin bushes and bush rollers, and also to prevent the chain from entering when lateral force is applied to the chain. The actuating force can be received smoothly without impairing bending or running performance, increasing transmission efficiency and improving safety. Furthermore, it is possible to enclose lubricant in the seal ring, which allows it to be used in high-speed transmission, and improves the durability of the chain.

[Brief explanation of the drawing]

Fig. 1 is a partial cross-sectional plan view showing an embodiment of the present invention, Fig. 2 is a front view thereof, Fig. 3 is an enlarged cross-sectional view showing the seal ring, and Fig. 4 shows the installation of the seal ring. FIGS. 5 and 6 are sectional views showing other examples of the seal ring, FIGS. 7 and 8 are sectional views showing other embodiments, and FIG. 9 is a sectional view showing a conventional technique. 2, 4, 21, 22, 41... link plate, 3... outer surface, 5, 6... inner surface, 7... roller, 8... bulge, 9... end surface, 10, 10A,
10B... Seal ring, 11... Bushiyu, 12
... Pin, 13 ... Base, 14 ... Cone part, 1
5...Rip part, g1...First gap, g2...
Second gap.

Claims (1)

[Scope of utility model registration request] A first gap in which the outer surface of a link plate connected by a bushing faces the inner surface of a link plate connected by a pin passing through the bushing and disposed on the outside of the link plate, or an end surface of a roller that is fitted onto the bushing. An elastic material is used to form a second gap in which the inner surfaces of the link plates connected by the bushings face each other, and the pin and the bushing are inserted into the second gap so as to be in contact with one side of each of the pins or the bushings facing each other in the gap. By providing a cone part around the annular base which can be bent toward the other surface and reducing the plate thickness toward the outer edge, the outer edge of the cone part comes into contact with the other surface and is elastically deformed. A chain in which a washer-shaped seal ring is interposed and has a lip portion that is in airtight contact with the other surface.