JP2012021541A - Oil-free chain - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an oil-free chain with its weight reduced and chain-driving power suppressed that prevents the entry of foreign matters outside the chain completely, holds lubricating oil between a bush and a connecting pin for a long time while preventing leakage thereof to the outside, and avoids mutual abrasion wearing liable to occur between an outer plate and an inner plate.SOLUTION: The oil-free chain 100 has the end surface 121 of the bush 120 located at the same level as the outside surface of the inner plate 110. The oil-free chain 100 includes an inside annular projecting part 152 of the outer plate 150 that projects from the reference inside surface 151 of the outer plate 150 to be concentric with a pin hole and faces the end surface 121 of the bush 120, and with an outside annular recessed part 154 that dents from the reference outside surface 153 of the outer plate 150 to be concentric with the pin hole, and corresponds to the inside annular projecting part 152.

Description

  The present invention relates to an oil-free chain used in a transmission chain, a conveyor belt, etc., and in particular, a pair of front and rear bushes press-fitted into bushing press-fitting holes of a pair of left and right inner plates, and rotation into these bushes. A pair of front and rear connecting pins that are freely inserted, and a pair of left and right outer plates that press-fit the pin ends of the connecting pins into the pin holes to connect the inner plate in the longitudinal direction of the chain, and are connected to the inner peripheral surface of the bush The present invention relates to an oil-free chain in which lubricating oil is sealed between the outer peripheral surfaces of pins.

  Conventionally, lubricated oil is sealed between the connecting pin and bushing using an O-ring to produce an oil-free chain and bushing made of oil-impregnated sintered metal with improved sliding life by reducing sliding wear between the connecting pin and bushing. An oil-free chain that lubricates the sliding portion between the connecting pin and the bush and the sliding portion between the bush and the roller is known (see, for example, Patent Document 1 and Patent Document 2).

JP 2007-170493 A (Claims, FIG. 2) JP 2004-196487 A (Claims, FIG. 3)

  However, the conventional oil-free chain in which lubricating oil is sealed between the connecting pin and bushing using an O-ring or the like suppresses chain elongation due to sliding wear between the connecting pin and bushing, improving the chain life. However, since the seal member is used, it is difficult to attach the seal member, the number of parts is increased, and the manufacturing cost is increased.

  Further, since the seal member slides between the inner plate and the outer plate when the chain is bent, there is a problem that the bending resistance of the chain is increased and the driving power of the chain is increased.

  Furthermore, when attaching the seal member, it is necessary to project the end of the bush from the inner plate, and the length of the bush increases to hang on the standard sprocket, the weight of the chain increases, and the driving power of the chain further increases. There was also a problem.

  In addition, in an oil-free chain that uses bushings made of oil-impregnated sintered metal to lubricate the sliding part of the connecting pin and bushing and the sliding part of the bushing and roller, the bushing receives repeated impact loads from the sprocket. In addition to the need for strength, it functions as a bearing as a counterpart to the connecting pin, so wear resistance is also required at the same time, but the current product cannot satisfy both characteristics at a high level at the same time. was there.

  Further, the conventional oil-free chain has a problem that there is no effective means for preventing foreign matter from entering the sliding portion between the connecting pin and the bush and the sliding portion between the bush and the roller.

  Therefore, the present invention solves the conventional problem, that is, the object of the present invention is to completely prevent foreign matter from entering from the outside of the chain and to leak out the lubricating oil between the bush and the connecting pin. Oil-free chain that has been maintained over a long period of time, avoided mutual sliding wear that tends to occur between the outer and inner plates, and reduced chain weight to reduce chain drive power Is to provide.

  The present invention according to claim 1 includes a pair of left and right inner plates spaced apart, a pair of front and rear bushes press-fitted into the bushing press-fitting holes of the inner plate, and a pair of front and rear connection pins rotatably inserted into the bushing. A pair of left and right outer plates for connecting the inner plate in the longitudinal direction of the chain by press-fitting the pin end of the connecting pin into the pin hole, and between the inner peripheral surface of the bush and the outer peripheral surface of the connecting pin In an oil-free chain in which lubricating oil is enclosed, an end surface of the bush is arranged flush with an outer surface of the inner plate, and the outer plate is concentrically formed with the pin hole. An inner annular protrusion that protrudes from the reference inner surface and faces the end face of the bush, and an outer annular recess that is concentric with the pin hole and that is recessed from the reference outer surface of the outer plate corresponding to the inner annular protrusion. This Accordingly, it solves the problems described above.

  According to a second aspect of the present invention, in addition to the configuration according to the first aspect, the inner annular convex portion and the outer annular concave portion are formed integrally with each other by embossing the outer plate. This solves the aforementioned problems.

  According to a third aspect of the present invention, in addition to the configuration according to the first or second aspect, the pin end portion of the connecting pin is housed in the outer annular recess of the outer plate. It solves the problem.

  According to a fourth aspect of the present invention, in addition to the configuration according to any one of the first to third aspects, the outer diameter D1 of the inner annular convex portion and the outer diameter D2 of the outer annular concave portion are D1. > The above-described problems are solved by forming each to satisfy D2.

  According to a fifth aspect of the present invention, in addition to the configuration according to any one of the first to fourth aspects, the outer diameter D1 of the inner annular convex portion and the outer diameter D3 of the bush are D1> D3. The above-described problems are solved by being formed so as to satisfy the above.

  Accordingly, the oil-free chain of the present invention includes a pair of left and right inner plates, a pair of front and rear bushes press-fitted into the bush press-fitting holes of the inner plates, and a pair of front and rear that are rotatably inserted into the bushes. And a pair of left and right outer plates for connecting the inner plate in the longitudinal direction of the chain by press-fitting the pin end portion of the connecting pin into the pin hole, and the inner peripheral surface of the bush and the outer peripheral surface of the connecting pin Since the lubricating oil is sealed between the connecting pin and the bush, the connecting link and the bush smoothly slide with each other through the lubricating oil, and the outer link and the inner link are relatively bent and rotated. As well as the following specific effects.

According to the first aspect of the present invention, the end surface of the bush is arranged flush with the outer surface of the inner plate, and the outer plate protrudes from the reference inner surface of the outer plate concentrically with the pin hole. An inner annular protrusion facing the end face of the bush and an outer annular recess recessed from the reference outer surface of the outer plate concentrically with the pin hole so as to correspond to the inner annular protrusion. Even if the gap between the outer plate and the inner plate is narrowed by the size of the annular protrusion protruding from the reference inner surface of the outer plate, the mutual frictional wear that tends to occur between the outer plate and the inner plate is avoided. Therefore, foreign matter intrusion from the outside of the chain can be completely prevented, and the lubricating oil secured between the bush and the connecting pin can be maintained without leaking outside.
And, by arranging the end face of the bush flush with the outer face of the inner plate, it becomes possible to keep the bush to the minimum length, so to prevent leakage of conventional lubricating oil It is no longer necessary to project the end face of the bush or lengthen the connecting pin corresponding to the end face of the projecting bush, thereby reducing the weight of the chain and reducing the drive power of the chain. it can.

  According to the oilless chain of the present invention according to claim 2, in addition to the effect exhibited by the oilless chain according to claim 1, the inner annular convex portion and the outer annular concave portion emboss the outer plate. Since the inner annular convex part and the outer annular concave part are press-molded into a highly accurate plane by forming the front and back integrally by processing, the gap between the inner annular convex part and the end face of the bush is highly accurate and uniform. As a result, foreign matter intrusion from the outside of the chain can be prevented more completely, and the lubricating oil between the bush and the connecting pin can be maintained for a long time.

  According to the oil-free chain of the present invention according to claim 3, in addition to the effect produced by the oil-free chain according to claim 1 or 2, the pin end portion of the connecting pin has an outer annular shape of the outer plate. By being accommodated in the recess, the width of the chain can be made as small as possible, and the pin end of the connecting pin protruding from the outer plate as in the prior art contacts the chain guide or the end of the connecting pin. It is possible to prevent the conveyed product from adhering.

  And according to the oilless chain of the invention which concerns on Claim 4, in addition to the effect which the oilless chain as described in any one of Claim 1 thru | or 3 show | plays, outer diameter D1 of an inner side annular convex part and When the outer annular recess and the inner annular protrusion are formed on the outer plate by embossing, the outer diameter D2 of the outer annular recess is formed so as to satisfy D1> D2. Since the outer plate can be easily plastically deformed so as to protrude in an offset state from the side surface toward the outer surface, the manufacturing burden can be reduced without reducing the plate strength of the outer plate.

  And according to the oilless chain of the invention concerning Claim 5, in addition to the effect which the oilless chain as described in any one of Claims 1 thru / or 4 shows, outside diameter D1 of an inner side annular convex part and Since the outer diameter D3 of the bush is formed so as to satisfy D1> D3, the inner annular convex portion facing the end surface of the bush covers the entire end surface of the bush. Further, it is possible to completely prevent the lubricating oil secured between the bushing and the connecting pin and maintain it for a long time without leaking outside.

The schematic diagram of the oil-free chain which is one Example of this invention. The perspective view which shows the connection state of the oil-free chain shown in FIG. Sectional drawing which shows a part of oil-free chain shown in FIG.

  The present invention includes a pair of left and right inner plates, a pair of front and rear bushes press-fitted into bushing press-fitting holes of these inner plates, a pair of front and rear connecting pins rotatably inserted into the bushes, and the connecting pins A pair of left and right outer plates that connect the inner plate in the longitudinal direction of the chain by press-fitting the end of the pin into the pin hole, and enclose lubricating oil between the inner peripheral surface of the bush and the outer peripheral surface of the connecting pin In the non-lubricated chain, the end face of the bush is arranged so that the end face of the bush is flush with the outer face of the inner plate, and the outer plate protrudes from the reference inner face of the outer plate concentrically with the pin hole. An inner annular convex portion facing the inner annular convex portion and an outer annular concave portion concentric with the pin hole and recessed from the reference outer surface of the outer plate corresponding to the inner annular convex portion. The chain prevents the lubricant between the bushing and the connecting pin for a long time without leaking outside, avoids mutual sliding wear that tends to occur between the outer plate and the inner plate, Any specific embodiment may be used as long as it achieves weight reduction and suppresses the driving power of the chain.

  That is, the oil-free chain of the present invention may be a chain in which lubricating oil is sealed between the connection pin and the bush, for example, a bush chain composed of an outer plate, an inner plate, a connection pin, and a bush, or Any of a roller chain composed of an outer plate, an inner plate, a connecting pin, a bush, and a roller may be used.

  In addition, regarding the gap between the inner annular convex portion of the outer plate and the end face of the bush, it is possible to completely prevent foreign matter from entering from the outside of the chain and to prevent external leakage of lubricating oil secured between the bush and the connecting pin. For example, when the inner plate is offset to one side with respect to the pair of left and right outer plates that are spaced apart, the gap L between the inner annular convex portion of the outer plate and the end surface of the bush on the offset side Is preferably 0.1 mm or less from the viewpoint of the oil viscosity at which the lubricating oil can be used, the environmental temperature, and the like.

  Furthermore, the protruding height of the inner annular convex portion with respect to the reference inner side surface of the outer plate may be any size as long as it can avoid mutual sliding wear that tends to occur between the outer plate and the inner plate. Even if it is an oil-free chain, it is preferable that it is formed to be 0.2 mm or less from the viewpoint of embossing production burden on the outer plate and prevention of reduction in plate strength.

Hereinafter, an oil-free chain according to an embodiment of the present invention will be described with reference to the drawings.
Here, FIG. 1 is a schematic view of an oil-free chain according to an embodiment of the present invention, FIG. 2 is a perspective view showing a connected state of the oil-free chain shown in FIG. 1, and FIG. It is sectional drawing which shows a part of oil-free chain shown in FIG.

First, as shown in FIGS. 1 to 3, an oil-free chain 100 according to an embodiment of the present invention is press-fitted into inner plates 110, 110 that are spaced apart from each other and a bush press-fitting hole of the inner plate 110. A pair of front and rear bushes 120, 120 made of a fitted steel material, a pair of front and rear rollers 130, 130 that are rotatably fitted to the bush 120, and a front and rear that are rotatably inserted into the bush 120. A pair of connecting pins 140 and 140, and a pair of left and right outer plates 150 and 150 that are pin-fitted into both ends of the connecting pin 140 and connect the inner plate 110 in the longitudinal direction of the chain are provided.
And between the inner peripheral surface of the bush 120 and the outer peripheral surface of the connecting pin 140, lubricating oil is enclosed.

Therefore, specific forms of the inner plate 110, the bush 120, and the outer plate 150, which are the most characteristic features of the oil-free chain 100 of this embodiment, will be described in detail with reference to FIGS.
First, as shown in FIGS. 1 to 3, the end surface 121 of the bush 120 is assembled so as to be flush with the outer surface of the inner plate 110 to keep the bush 120 to a minimum height.

Further, on the outer surface of the outer plate 150, an inner annular protrusion 152 that protrudes from the reference inner surface 151 of the outer plate 150 concentrically with the pin hole of the outer plate 150 and faces the end surface 121 of the bush 120, and the inner annular protrusion Corresponding to the portion 152, an outer annular recess 154 that is recessed from the reference outer surface 153 of the outer plate 150 is formed concentrically with the pin hole.
That is, the inner annular convex portion 152 and the outer annular concave portion 154 are formed integrally with each other by embossing the outer plate 150.
As a result, even if the gap between the outer plate 150 and the inner plate 110 is narrowed by the dimension of the inner annular convex portion 152 of the outer plate 150 protruding from the reference inner side surface 151 of the outer plate 150, the outer plate 150 and the inner plate Mutual sliding wear that tends to occur between the two and 110 is avoided.

Further, the pin end portion of the connecting pin 140 described above is housed in the outer annular recess 154 of the outer plate 150 by fastening or the like.
As a result, the chain width is reduced as much as possible, and the pin end portion of the connecting pin 140 protruding from the outer plate 150 as in the prior art comes into contact with a chain guide (not shown) or is conveyed to the pin end portion of the connecting pin 140. And so on.

Further, the outer diameter D1 of the inner annular convex portion 152 and the outer diameter D2 of the outer annular concave portion 154 in the outer plate 150 are formed so as to satisfy D1> D2.
Accordingly, when the inner annular convex portion 152 and the outer annular concave portion 154 are formed on the outer plate 150 by embossing, the outer plate 150 projects in an offset state from the inner surface to the outer surface of the outer plate 150. Can be easily plastically deformed.

Further, the outer diameter D1 of the inner annular convex portion 152 and the outer diameter D3 of the bush 120 in the outer plate 150 are formed so as to satisfy D1> D3, respectively.
As a result, the inner annular convex portion 152 that faces the end surface 121 of the bush 120 covers the entire end surface 121 of the bush 120.

  Note that the gap L between the inner annular convex portion 152 of the outer plate 150 and the end surface 121 of the bush 120 in the oil-free chain 100 of the present embodiment is spaced from the viewpoint of the usable oil viscosity, environmental temperature, and the like of the lubricating oil. When the inner plate 110 is offset to one side with respect to the pair of left and right outer plates 150, the gap L between the inner annular convex portion 152 of the outer plate 150 and the end surface 121 of the bush 120 on the offset side is 0.1 mm. It is assembled as follows.

  Further, with respect to the protruding height H of the inner annular convex portion 152 with respect to the reference inner side surface 151 of the outer plate 150, mutual sliding wear that tends to occur between the inner plate 110 and the outer plate 150 can be avoided. And 0.2 mm or less.

  In the oilless chain 100 of the present embodiment obtained as described above, the end surface of the bush 120 is arranged flush with the outer surface of the inner plate 110, and the outer plate 150 is concentric with the pin hole. An inner annular protrusion 152 that protrudes from the reference inner surface 151 of the outer plate 150 and faces the end surface 121 of the bush 120, and a reference outer surface 153 of the outer plate 150 concentrically with the pin hole corresponding to the inner annular protrusion 152. By providing the outer annular recess 154 that is recessed from the inside, the gap between the inner annular projection 152 and the end surface 121 of the bush 120 is ensured with high accuracy and uniformity, and foreign matter intrusion from the outside of the chain can be completely prevented. The lubricating oil between the inner plate 110 and the connecting pin 140 is maintained for a long time without leaking to the outside. The end face 121 of the bush 120 protrudes in order to avoid mutual sliding wear that tends to occur and prevents leakage of conventional lubricating oil, or the length of the connecting pin 140 corresponding to the end face 121 of the protruded bush 120 is large. It is no longer necessary to reduce the weight of the chain, thereby reducing the weight of the chain, thereby reducing the driving power of the chain and reducing the manufacturing burden without reducing the plate strength of the outer plate 150, etc. The effect is enormous.

DESCRIPTION OF SYMBOLS 100 ... Oil-free chain 110 ... Inner plate 120 ... Bush 121 ... End face of bush 130 ... Roller 140 ... Connecting pin 150 ... Outer plate 151 ... Reference of outer plate Inner side surface 152 ・ ・ ・ Inner annular convex portion 153 of outer plate 153 ・ ・ ・ Reference outer side surface 154 of outer plate Outer annular concave portion of outer plate D1 ・ ・ ・ Outer diameter of inner annular convex portion D2 ・ ・ ・ Outer annular shape The outer diameter of the recess D3 ... the outer diameter of the bush L ... the gap between the inner annular convex part and the end face of the bush H ... the protruding height of the inner annular convex part relative to the reference inner side surface of the outer plate

Claims (5)

A pair of left and right inner plates spaced apart, a pair of front and rear bushes press-fitted into the bushing press-fit holes of the inner plate, a pair of front and rear connection pins rotatably inserted into the bushes, and a pin end portion of the connection pin A pair of left and right outer plates for press-fitting and fitting the inner plate in the longitudinal direction of the chain by press-fitting into the hole, and lubricating oil is sealed between the inner peripheral surface of the bush and the outer peripheral surface of the connecting pin In the chain
The end surface of the bush is disposed flush with the outer surface of the inner plate,
The outer plate protrudes from the reference inner surface of the outer plate concentrically with the pin hole and faces the end surface of the bush, and the outer plate has a concentric shape with the pin hole corresponding to the inner annular protrusion. An oil-free chain comprising an outer annular recess recessed from a reference outer surface.   2. The oil-free chain according to claim 1, wherein the inner annular convex portion and the outer annular concave portion are integrally formed on the front and back sides by embossing the outer plate.   The oil-free chain according to claim 1 or 2, wherein a pin end portion of the connecting pin is accommodated in an outer annular recess of the outer plate.  4. The outer diameter D1 of the inner annular convex portion and the outer diameter D2 of the outer annular concave portion are formed so as to satisfy D1> D2, respectively. Oil-free chain as described in   5. The outer diameter D <b> 1 of the inner annular protrusion and the outer diameter D <b> 3 of the bush are formed so as to satisfy D <b> 1> D <b> 3, respectively. Oilless chain.

Images