JPH0676218U - Roller chain - Google Patents

Abstract

(57) [Summary] [Purpose] A seal for preventing oil leakage from the lubrication part between the pin and the bush is installed without any special processing on the bush. [Structure] The ends of the inner link plate 1 and the outer link plate 2 are sequentially connected by a pin 3. The roller 5 is attached to the outer periphery of the pin 3 via the bush 4. Pin 3
A lubricating portion 8 is formed so as to supply lubricating oil to the sliding portion between the bush 4 and the bush 4. A seal 14 that prevents leakage of lubricating oil from the lubrication portion 8 is attached to the outer periphery of the end portion of the bush 4. The seal 14 includes inner and outer seal rings 11 and 12 and tapered surfaces 11a and 1a having tapered surfaces 11a and 12a.
It is a full float type consisting of an O ring 13 held between 2a.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a high load roller chain used in a cargo handling device such as an unloader.

[0002]

[Prior art]

 In this type of high load roller chain, as shown in (a) and (b) of FIG. 3, the ends of the pair of inner link plates 1 and the pair of outer link plates 2 are sequentially connected by the pins 3, A bush 4 corresponding to the space between the outer link plates 2 is fitted around the outer periphery of each pin 3 by penetrating the pin hole of the inner link plate 1, and the inner link plate 1 is attached to the outer periphery of the bush 4. Is provided with a roller 5 corresponding to the space between the pins 3 and an oil supply passage 6 which passes from the one end to the inside and reaches the outer peripheral surface is provided on the pin 3 to lubricate the sliding portion between the pin 3 and the bush 4 with grease or the like. A lubrication portion 8 to which oil is supplied is formed, and a seal 7 is attached to the outer periphery of the end portion of the bush 4 between the inner link plate 1 and the outer link plate 2, and the pin 3 and the bush 4 are connected. Lubricating oil from the lubrication part 8 between It is as leakage is prevented. Reference numeral 3a denotes a mounting portion such as a bucket formed on one end side of the pin 3 so as to extend.

As shown in the enlarged view of FIG. 4, the seal 7 has a seal ring 9 having an inner peripheral surface having a tapered surface 9 a, and an O ring 10 adapted to be brought into contact with the tapered surface 9 a of the seal ring 9. The O-ring 10 is arranged so as to contact the taper surface 4a formed on the outer peripheral edge of the end of the bush 4, and the one side surface 9b of the seal ring 9 contacts the inner side surface of the outer link plate 2. There is a configuration.

[0004]

[Problems to be solved by the device]

 However, in the case of the above-mentioned conventional roller chain, a tapered surface 4a is formed on the outer peripheral edge of the end portion of the bush 4 in order to attach the seal 7 for preventing oil leakage from the lubrication portion 8 between the pin 3 and the bush 4. However, since the bush 4 is press-fitted into the pin hole of the inner link plate 1, considering the deformation at the time of press-fitting, the machining of the tapered surface 4a described above has a roundness after press-fitting. It must be carried out while taking out, and when the distance between the inner link plate 1 and the outer link plate 2 is narrow and the protruding amount of the bush 4 is limited, there is a problem that the above-mentioned working operation becomes extremely difficult. . Further, even if the tapered surface 4a is machined on the outer peripheral edge of the bush 4 with accurate roundness, the thickness of the bush 4 is reduced by that amount, so that the bush 4 is deformed when it is fitted. This deformation causes a portion with a low contact surface pressure between the O-ring 10 and the seal ring 9, which causes a problem that the lubricating oil easily leaks.

Further, in the above roller chain, it is advantageous to supply the lubricating oil also to the sliding portion between the bush 4 and the roller 5, in which case the roller 5 and the inner link plate 1 A seal is also required between them. However, since the space between the roller 5 and the inner link plate 1 is narrower than the space between the inner link plate 1 and the outer link plate 2, it is difficult to provide the seal 7 having the above-described configuration, and therefore the bush 4 and At present, no lubricating oil is supplied to the sliding portion between the roller 5 and the roller.

Therefore, in the present invention, the seal for preventing the leakage of the lubricating oil from the lubrication portion between the pin and the bush can be securely attached without applying special processing to the outer peripheral edge of the end portion of the bush. In addition, it is possible to reliably prevent leakage of lubricating oil from this part by forming a lubricating part also in the sliding part between the bush and the roller. is there.

[0007]

[Means for Solving the Problems]

 In order to solve the above-mentioned problems, the present invention sequentially connects the ends of a pair of inner link plates and a pair of outer link plates with a pin, and penetrates the inner link plate at the outer peripheral portion of the pin. Thus, in the roller chain in which the bush is fitted, the roller is provided on the outer circumference of the bush, and the lubricated portion is formed by lubricating oil between the pin and the bush, the outer peripheral position of the end of the bush is In addition, a full-float type seal in which a required tapered surface is formed on the opposing peripheral surfaces of the inner seal ring and the outer seal ring, and an O-ring is interposed between both tapered surfaces, One of them is arranged so as to be pressed against the outer surface of the inner link plate, and the other is arranged so as to be pressed against the inner surface of the outer link plate by utilizing tapered surfaces.

Further, a lubricating portion is formed between the bush and the roller by a lubricating oil, and a required taper surface is formed on the outer peripheral position of the bush on the opposing peripheral surfaces of the inner seal ring and the outer seal ring. A full-float type seal, in which an O-ring is sandwiched between both tapered surfaces, is pressed against one of the inner and outer seal rings to the end surface of the roller and the other to the outer surface of the inner link plate. It is arranged as follows.

[0009]

[Action]

 Since a full-float type seal is installed between the inner and outer link plates, there is no need to process the end of the bush and the full-float type seal can be manufactured in any size. Even if the space between the outer link plates is small, it can be dealt with, and the leakage of lubricating oil can be reliably prevented.

Further, by providing a full-float type seal between the roller and the inner link plate, it is possible to form a lubricated portion between the bush and the roller, which ensures the sealability, and thus the life of the roller chain. Will be able to postpone.

[0011]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows an embodiment of the present invention. Similar to that shown in FIG. 3, the ends of the inner link plate 1 and the outer link plate 2 are sequentially connected by a pin 3, and the pin 3 is connected. A bush 4 having a length extending between the inner side surfaces of the outer link plate 2 is fitted on the outer periphery of the roller 4, and a roller 5 having a length extending to the inner link plate 1 is provided on the outer periphery of the bush 4, and the pin 3 is provided. In a roller chain in which a lubricating portion 8 made of lubricating oil is formed on a sliding portion between the bush 4 and the bush 4, an inner seal ring 11 having an outer peripheral surface having a tapered surface 11a, and an inner peripheral surface having the tapered surface 11a. A full-float type seal 14 including an outer seal ring 12 having a parallel tapered surface 12a and an O-ring 13 sandwiched between the tapered surfaces 11a and 12a of both seal rings 11 and 12 is described above. Due to the elastic action of the O-ring 13 and the action of the tapered surfaces 11a and 12a, the inside of the outer circumference of the end of the bush 4 projecting between the outer surface of the inner link plate 1 and the inner surface of the outer link plate 2 The seal ring 11 is mounted so that one side surface 11b of the seal ring 11 is pressed against the outer surface of the inner link plate 1 and the opposite side surface 12b of the outer seal ring 12 is pressed against the inner surface of the outer link plate 2.

In the above description, since the seal 14 is a full float type consisting of the inner seal ring 11, the outer seal ring 12 and the O ring 13, the end portion of the bush 4 is not processed, and the inner link plate is not processed. Even if the space between the outer side surface of 1 and the inner side surface of the outer link plate 2 is narrow, it is possible to mount the one having a size corresponding to the space. Further, when the seal 14 is installed, the inner seal ring 11 and the outer seal ring 12 have corresponding tapered surfaces 11a and 12a, respectively. The side surface 11b is slidably pressed against the outer surface of the inner link plate 1, and the opposite side surface 12b of the outer seal ring 12 is slidably pressed against the inner surface of the outer link plate 2. Therefore, even if relative displacement occurs between the inner link plate 1 and the outer link plate 2, the inner seal ring 11 is pressed against the inner link plate 1 and the outer link plate 2 of the outer seal ring 12 is pressed. Between the pin 3 and the bush 4 by maintaining the pressed state against the pin 3 and the contact surface pressure between the O-ring 13 and the inner seal ring 11 and the outer seal ring 12 even in the circumferential direction. It is possible to prevent the lubricating oil from leaking from the lubricating portion 8 and to obtain a reliable sealing property.

Next, FIG. 2 shows another embodiment of the present invention. In the same structure as the embodiment shown in FIG. 1, the sliding portion between the bush 4 and the roller 5 is A lubricating portion 16 is formed so that the lubricating oil is supplied from the lubricating portion 8 between the pin 3 and the bush 4 through the communication passage 15 provided in the thickness direction of the bush 4, and the end surface of the roller 6 and the inner link are formed. A small full-float type seal 14 'having the same structure as the seal 14 is attached to the outer peripheral position of the bush 4 between the inner surface of the plate 1 and the inner surface of the plate 1.

In the case of the embodiment shown in FIG. 2, the seal 14 'can surely prevent the leakage of the lubricating oil from the lubricating portion 16 formed between the bush 4 and the roller 5. That is, since the seal 14 'has the same structure as that of the seal 14, it is possible to cope with a slight gap between the roller 5 and the inner link plate 1, and thus a reliable sealing means can be conventionally provided. It is possible to eliminate the problem that lubrication could not be performed between the bush 4 and the roller 5 without using it, and it is possible to lubricate the roller 5 smoothly, further extending the life of the entire roller chain. It becomes possible.

The present invention is not limited to the above embodiment, and the seals 14 and 14 ′ may be mounted in opposite directions in the pin axis direction in the figure. Of course, various changes can be made without departing from the scope of the invention.

[0017]

[Effect of device]

 As described above, according to the roller chain of the present invention, the full-float type seal in which the O-ring is sandwiched between the opposed tapered surfaces of the inner and outer seal rings is used as the lubricating portion between the pin and the bush. Since the structure is used to prevent the leakage of lubricating oil from the inside, the above-mentioned seal can be easily performed without special processing on the end of the bush and even if there is no large space between the inner and outer link plates. It can be installed to obtain a reliable sealing property.Furthermore, a lubrication part is formed between the bush and the roller to form a full flow between the roller and the inner link plate with the same structure as above. By installing a G-shaped seal, it is possible to reliably prevent the leakage of lubricating oil from the lubrication part between the bush and the roller, and it is possible to maintain the sliding lubricity of the roller. Can be extended more roller chain life, there is exhibited an excellent effect that.

[Brief description of drawings]

FIG. 1 is an enlarged sectional view of an essential part showing an embodiment of a roller chain of the present invention.

FIG. 2 is an enlarged cross-sectional view of a main part showing another embodiment of the present invention.

FIG. 3 shows an example of a roller chain, (a) is a partially cut plan view, and (b) is a side view.

FIG. 4 is a partially enlarged view of FIG.

[Explanation of symbols]

 1 Inner link plate 2 Outer link plate 3 Pin 4 Bushing 5 Roller 8 Lubricating part 11 Inner seal ring 11a Tapered surface 12 Outer seal ring 12a Tapered surface 13 O-ring 14, 14 'Full float type seal 16 Lubricated part

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Shintaro Shimamura 1-19-10 Mori 1-chome, Koto-ku, Tokyo Tadashi Ema Building Ishikawajima Harima Heavy Industries Co., Ltd. Koto Office

Claims (2)

[Scope of utility model registration request] 1. A pair of inner link plates and a pair of outer link plates are connected at their ends by a pin in order, and a bush is fitted around the outer periphery of the pin so as to penetrate the inner link plate. In a roller chain in which a roller is provided on the outer circumference of the bush, and a lubricating portion formed by lubricating oil is formed between the pin and the bush, the inner seal ring and the outer seal ring face each other at the outer peripheral position of the end of the bush. A full-float type seal in which a required tapered surface is formed on the peripheral surface and an O-ring is interposed between the tapered surfaces, one of the inner seal ring and the outer seal ring is provided on the outer surface of the inner link plate. The roller chain has a structure in which the other side is arranged so as to be pressed against the inner side surface of the outer link plate by utilizing respective tapered surfaces. 2. A lubrication portion made of lubricating oil is formed between the bush and the roller, and a required taper surface is formed on the outer peripheral position of the bush on the opposing peripheral surfaces of the inner seal ring and the outer seal ring. A full-float type seal having O-rings sandwiched between both tapered surfaces is pressed against one of the inner and outer seal rings to the end surface of the roller and the other to the outer surface of the inner link plate. The roller chain according to claim 1, wherein the roller chain is arranged as described above.