JP4368645B2 - Roller bearing type chain - Google Patents

Description

  The present invention relates to a roller bearing type chain in which a plurality of rollers are incorporated between a roller and a bush, and more particularly to a roller bearing type chain in which a roller rotates.

Conventionally, as a chain that uses a roller bearing of the type in which the roller rotates, a plurality of rollers are incorporated between the roller and the bushing, and thrust bearing plates that are mounted on the outer periphery of the bushing are arranged facing both side surfaces of the roller. (For example, refer to Patent Document 1).
JP 2002-340106 A

Also, as a roller bearing of the type in which the outer ring rotates, a thrust ball bearing is provided on both sides of the needle roller bearing, and an annular step portion having a substantially inverted L-shaped cross section is formed inward from the end face of the outer ring. A track surface is formed on the vertical wall surface of the annular step portion, and a ball housing portion having a substantially L-shaped cross section is formed outward from the inner wall of the thrust washer corresponding to the track surface, and the track is formed on the vertical wall surface. A needle-like surface in which the surface is formed and the ball is between the raceway surface of the outer ring and the raceway surface of the thrust washer, and the radial width of the vertical wall surface of the annular step is slightly larger than the diameter of the ball to be incorporated A roller bearing is known (see, for example, Patent Document 2).
Japanese Patent Publication No. 7-35808

However, the chain disclosed in Japanese Patent Laid-Open No. 2002-340106 has the following problems.
That is, when an axial load is applied to the roller as the roller rotates, the axial load causes a sliding contact between the outer surface of the roller and the side surface of the thrust bearing plate.
This sliding contact causes sliding wear between the outer surface of the roller and the side surface of the thrust bearing plate. This sliding wear reduces the life of the chain.
Further, due to the axial load applied to the roller, the sliding resistance and sliding noise between the outer surface of the roller and the thrust bearing plate increase, and the rotation failure of the roller occurs.
Further, due to the sliding resistance between the outer surface of the roller and the thrust bearing plate, noise is generated, power consumption is increased, and rotation fluctuation of the roller is generated.

The needle roller bearing disclosed in the above Japanese Patent Publication No. 7-35808 has the following problems.
That is, when radial wear of the outer ring, the inner ring and the needle roller proceeds due to the radial load applied to the needle roller bearing, the annular step portion of the outer ring comes into contact with the outer periphery of the thrust washer. There was a problem that rotation failure of the outer ring occurred.
Further, when the outer ring, the inner ring, and the needle rollers are worn in the radial direction, the ball receiving the axial load also receives the radial load, and there is a problem that the wear of the ball is promoted.
In addition, since the ball subjected to the axial load has a structure that is held between the annular step portion of the outer ring and the ball receiving portion of the thrust washer, there is a problem that it is difficult to hold the ball at the time of assembling and the assembling property is poor. there were.

  Therefore, the present invention solves the conventional problems, that is, the object of the present invention is to provide a roller bearing type chain in which a plurality of rollers are incorporated between the outer peripheral surface of the bush and the inner peripheral surface of the roller. The present invention provides a roller bearing type chain that reduces sliding wear or sliding resistance of a roller to which an axial load is applied and has good assemblability.

  According to the first aspect of the present invention, a pair of outer plates respectively arranged on both outer sides of a pair of inner plates connected by a bush are connected by a connecting pin rotatably inserted into the bush, and the outer peripheral surface of the bush A plurality of rollers are incorporated between the inner peripheral surface of the roller and a plurality of balls can be freely rolled between a thrust bearing plate mounted on the outer periphery of the bush and a side surface of the roller facing the thrust bearing plate. In the held roller bearing type chain, the raceway grooves that hold the plurality of balls so as to roll freely from three directions are respectively provided on both side surfaces of the roller, thereby solving the above-described problems.

  According to a second aspect of the present invention, a pair of outer plates respectively arranged on both outer sides of a pair of inner plates connected by a bush are connected by a connecting pin rotatably inserted into the bush, and the outer peripheral surface of the bush In a roller bearing type chain in which a plurality of rollers are incorporated between the inner peripheral surface of the roller, a circular arc groove in cross section is provided on the inner diameter side of both side surfaces of the roller, and the circular arc groove in cross section is opposed to the outer periphery of the bush. A spacer ring is mounted at each position to support the end faces of a plurality of rollers on the inner surface of the spacer ring, and a plurality of balls are rolled from three directions by the outer surface of the spacer ring and the circular groove in cross section. By forming the raceway groove to be freely held, the above-described problems are solved.

According to the roller bearing type chain according to the first aspect of the present invention, since the raceway grooves that hold the plurality of balls so as to roll freely from the three directions are respectively provided on both side surfaces of the roller, an axial load is applied. Between the both side surfaces of the roller and the thrust bearing plate, a rolling contact is made by a plurality of balls, and the wear life can be improved as compared with the wear caused by sliding by the conventional sliding contact.
In addition, since the plurality of balls held between the raceway groove and the thrust bearing plate are configured to receive only an axial load, the plurality of balls are affected by the wear of a plurality of rollers that receive the radial load. I do not receive it.
Further, since the rolling contact between the both side surfaces of the roller and the thrust bearing plate is caused by a plurality of balls, the rotational resistance of the roller due to the axial load is reduced, and the noise due to the rotation of the roller can be reduced.
Further, since the rotational resistance of the roller due to the axial load is reduced, it is possible to save energy and prevent fluctuations in the rotation of the roller.
Furthermore, since the plurality of balls can be held from three directions by the raceway grooves provided on both side surfaces of the roller, the plurality of balls can be easily held at the time of assembly, and the assemblability can be improved.

According to the roller bearing type chain of the invention of claim 2, the cross-section arc-shaped annular groove is provided on the inner diameter side of the both side surfaces of the roller, and the spacer ring is respectively provided at a position facing the cross-section arc-shaped annular groove on the outer periphery of the bush. Mounts and supports the end faces of the rollers on the inner surface of the spacer ring, and forms the raceway grooves that hold the balls in three directions so that they can roll freely from the outer surface of the spacer ring and the circular groove in cross section. Therefore, the rolling contact is made by multiple balls between the both sides of the roller to which the axial load is applied and the inner plate that supports the axial load. Lifespan can be improved.
In addition, since the plurality of balls held by the raceway groove so as to be able to roll from three directions are configured to receive only the axial load, they are not affected by the wear of the plurality of rollers receiving the radial load.
In addition, the rolling contact between the both side surfaces of the roller and the inner plate supporting the axial load is caused by a plurality of balls, so that the rotational resistance of the roller due to the axial load is reduced, and the noise due to the rotation of the roller is also reduced. it can.
Further, since the rotational resistance of the roller due to the axial load is reduced, it is possible to save energy and prevent fluctuations in the rotation of the roller.
Furthermore, since the plurality of balls can be held from three directions by the raceway groove formed by the outer surface of the spacer ring and the circular groove in cross section, it is easy to hold the plurality of balls at the time of assembly. Can be improved.

  Below, the roller bearing type | mold chain which is an Example of this invention is demonstrated.

A roller bearing type chain that is Embodiment 1 of the present invention will be described.
FIG. 1 is a cross-sectional view of a main part of a roller bearing type chain that is Embodiment 1 of the present invention.
2 is a cross-sectional view taken along line XX in FIG.
3A and 3B show a thrust bearing plate which is a modification of FIG. 1, in which FIG. 3A is a plan view and FIG. 3B is a cross-sectional view thereof.

1 and 2, a pair of inner plates 1, 1 are connected by a hollow cylindrical bush 2, and a plurality of rollers are arranged between the outer peripheral surface of the bush 2 and the inner peripheral surface of the roller 3. Needle rollers 4 are incorporated.
Further, outer plates 5 are arranged on both outer sides of the pair of inner plates 1, 1, respectively, and the pair of outer plates 5, 5 are connected by a connecting pin 6 that is rotatably inserted into the bush 2.

In addition, a carbon-impregnated ceramic thrust bearing plate 7 having self-lubricating properties is disposed opposite to both side surfaces of the roller 3 and mounted on the outer periphery of the bush 2.
Further, raceway grooves 8 are provided on both side surfaces of the roller 3 facing the thrust bearing plate 7, and a plurality of balls 9 are rotatably held between the raceway groove 8 and the thrust bearing plate 7. .

In the roller bearing type chain shown in FIGS. 1 and 2, the plurality of needle rollers 4 interposed between the bush 2 and the roller 3 support the radial load of the roller bearing, and the roller 3 and the thrust bearing plate 7 A plurality of balls 9 interposed between them support the axial load of the roller bearing.
Therefore, the bush 2, the roller 3, the plurality of needle rollers 4, the thrust bearing plate 7, and the plurality of balls 9 constitute a roller bearing capable of applying both a radial load and an axial load.

FIG. 3 shows a thrust bearing plate which is a modified example of FIG. 1, and the thrust bearing plate shown in FIG. 3 can be used in place of the thrust bearing plate 7 of FIG.
The thrust bearing plate 7 ′ shown in FIG. 3 has a raceway groove 7′a having an arcuate cross section on the surface with which a plurality of balls 9 abut.
When the balls 9 roll in contact with the raceway grooves 7′a of the thrust bearing plate 7 ′, they can receive a larger axial load than the thrust bearing plate 7 of FIG.

The operation and effect of the roller bearing type chain shown in FIGS. 1 and 2 configured as described above will be described below.
When the roller 3 rotates and an axial load is applied, the axial load applied to the roller 3 is supported by the inner plate 1 via the plurality of balls 9 and the thrust bearing plate 7.
Thus, the rolling bearing plate 7 is in rolling contact between both side surfaces of the roller 3 to which an axial load is applied and the thrust bearing plate 7, and the wear life is improved as compared with the wear caused by sliding by the conventional sliding contact. .
In addition, since the plurality of balls 9 held between the raceway groove 8 and the thrust bearing plate 7 have a structure that receives only an axial load, the plurality of balls 9 has a plurality of needle-like shapes that receive a radial load. Unaffected by wear of the rollers 4.
Further, since the rolling contact between the both side surfaces of the roller 3 and the thrust bearing plate 7 is caused by a plurality of balls 9, the rotational resistance of the roller 3 due to the axial load is reduced, and the noise due to the rotation of the roller 3 is also reduced.
Further, since the rotational resistance of the roller 3 due to the axial load is reduced, it is possible to save energy, and the rotational fluctuation of the roller 3 can be prevented.
Further, since the plurality of balls 9 can be held from three directions by the raceway grooves 8 provided on both side surfaces of the roller 3, the plurality of balls 9 can be easily held at the time of assembly, and the assemblability is improved.

A roller bearing type chain that is Embodiment 2 of the present invention will be described.
FIG. 4 is a cross-sectional view of a main part of a roller bearing type chain that is Embodiment 2 of the present invention.
5 is a cross-sectional view taken along line YY in FIG.
FIG. 6 shows a thrust bearing plate which is a modified example of FIG. 4, (A) is a plan view thereof, and (B) is a sectional view thereof.

4 and 5, a pair of inner plates 1 and 1 are connected by a hollow cylindrical bush 2, and a gap between the outer peripheral surface of the bush 2 and the inner peripheral surface of the roller 13 will be described later. A plurality of needle rollers 14 are incorporated.
Further, outer plates 5 are arranged on both outer sides of the pair of inner plates 1, 1, respectively, and the pair of outer plates 5, 5 are connected by a connecting pin 6 that is rotatably inserted into the bush 2. .

As shown in FIGS. 4 and 5, the roller 13 includes a roller body 13a and a roller bush 13b.
The roller body 13a has annular step portions 13c formed on the inner diameter side of both side surfaces thereof.
The roller bush 13b is made of a carbon-impregnated ceramic having a self-lubricating property and is formed in a cylindrical shape.
And the outer peripheral surface of the roller bush 13b is press-fitted and attached to the inner peripheral surface of the roller main body 13a.
Thereby, the raceway grooves 18 of the plurality of balls 19 are formed by the annular step portion 13c of the roller body 13a and the outer peripheral surface of the roller bush 13b.
Further, a plurality of needle rollers 14 are incorporated between the outer peripheral surface of the bush 2 and the inner peripheral surface of the roller bush 13b.

Further, a thrust bearing plate 17 made of carbon-impregnated ceramic having self-lubricating properties is disposed to face both side surfaces of the roller 13 and is mounted on the outer periphery of the bush 2.
Further, a plurality of balls 19 are rotatably held between the thrust bearing plate 17 and the raceway grooves 18 on both side surfaces of the roller 13 facing the thrust bearing plate 17.

4 and 5, the plurality of needle rollers 14 interposed between the bush 2 and the roller 13 support the radial load of the roller bearing, and the roller 13 and the thrust bearing plate 17 A plurality of balls 19 interposed between them support the axial load of the roller bearing.
Therefore, the bush 2, the roller 13, the plurality of needle rollers 14, the thrust bearing plate 17, and the plurality of balls 19 constitute a roller bearing capable of applying both a radial load and an axial load.

6 shows a thrust bearing plate which is a modified example of FIG. 4. The thrust bearing plate shown in FIG. 6 can be used in place of the thrust bearing plate 17 of FIG.
A thrust bearing plate 17 ′ shown in FIG. 6 has a raceway groove 17′a having an arcuate cross section on the surface with which a plurality of balls 19 abut.
When the balls 19 roll in contact with the raceway grooves 17′a of the thrust bearing plate 17 ′, they can receive a larger axial load than the thrust bearing plate 17 of FIG.

The operation and effect of the roller bearing type chain shown in FIGS. 4 and 5 configured as described above will be described below.
When the roller 13 rotates and an axial load is applied, the axial load applied to the roller 13 is supported by the inner plate 1 via the plurality of balls 19 and the thrust bearing plate 17.
In view of this, a rolling contact is made by the plurality of balls 19 between the both side surfaces of the roller 13 to which an axial load is applied and the thrust bearing plate 17, and the wear life is improved as compared with the wear caused by sliding by the conventional sliding contact. .
Further, since the plurality of balls 19 held between the raceway groove 18 and the thrust bearing plate 17 have a structure that receives only an axial load, the plurality of balls 19 has a plurality of needle-like shapes that receive a radial load. Unaffected by wear of the rollers 14.
Further, since the rolling contact between the both side surfaces of the roller 13 and the thrust bearing plate 17 is caused by a plurality of balls 19, the rotational resistance of the roller 13 due to the axial load is reduced, and the noise due to the rotation of the roller 13 is also reduced.
Further, since the rotational resistance of the roller 13 due to the axial load is reduced, it is possible to save energy, and the rotational fluctuation of the roller 13 can be prevented.
Further, since the plurality of balls 19 can be held from three directions by the raceway grooves 18 provided on both side surfaces of the roller 13, it is easy to hold the plurality of balls 19 at the time of assembly, and the assemblability is improved.

A roller bearing type chain that is Embodiment 3 of the present invention will be described.
FIG. 7 is a cross-sectional view of a main part of a roller bearing type chain that is Embodiment 3 of the present invention.
8 is a cross-sectional view taken along the line ZZ in FIG.

7 and 8, a pair of inner plates 1, 1 are connected by a hollow cylindrical bush 2, and a plurality of rollers are provided between the outer peripheral surface of the bush 2 and the inner peripheral surface of the roller 23. Cylindrical rollers 24 are incorporated.
Further, outer plates 5 are arranged on both outer sides of the pair of inner plates 1, 1, respectively, and the pair of outer plates 5, 5 are connected by a connecting pin 6 that is rotatably inserted into the bush 2.

As shown in FIGS. 7 and 8, an annular groove 23 a having a circular arc cross section is provided on the inner diameter side of both side surfaces of the roller 23.
In addition, carbon impregnated ceramic spacer rings 27 each having self-lubricating properties are mounted on the outer periphery of the bush 2 at positions facing the circular groove 23a having a circular arc cross section.
The end surfaces of the plurality of cylindrical rollers 24 are supported by the inner surface of the spacer ring 27, and the raceway groove 28 is formed by the outer surface of the spacer ring 27 and the circular arc groove 23 a in cross section.
A plurality of balls 29 are held in a freely rolling manner by the raceway grooves 28, and the plurality of balls 29 are in contact with the side surface of the inner plate 1.

7 and 8, the plurality of cylindrical rollers 24 interposed between the bush 2 and the roller 23 support the radial load of the roller bearing, and the roller 23 and the inner plates 1, 1 A plurality of balls 29 interposed between them support the axial load of the roller bearing.
Therefore, the bush 2, the roller 23, the plurality of cylindrical rollers 24, and the plurality of balls 29 constitute a roller bearing capable of applying both a radial load and an axial load.

The operation and effect of the roller bearing type chain shown in FIGS. 7 and 8 configured as described above will be described below.
When the roller 23 rotates and an axial load is applied, the axial load applied to the roller 23 is supported by the inner plates 1 and 1 via the plurality of balls 29.
Therefore, the rolling contact between the both side surfaces of the roller 23 to which the axial load is applied and the inner plates 1, 1 and the spacer ring 27 is brought into rolling contact by a plurality of balls 29, as compared with the wear due to sliding by the conventional sliding contact. Wear life is improved.
In addition, since the plurality of balls 29 held between the raceway groove 28 and the inner plates 1 and 1 are configured to receive only an axial load, the plurality of balls 29 are a plurality of cylinders that receive a radial load. The roller 24 is not affected by wear.
Further, since the rolling contact by the plurality of balls 29 is made between the both side surfaces of the roller 23 and the inner plates 1, 1 and the spacer ring 27, the rotational resistance of the roller 23 due to the axial load is reduced, and the roller 23 rotates. Noise is also reduced.
Further, since the rotational resistance of the roller 23 due to the axial load is reduced, energy saving can be achieved, and the rotational fluctuation of the roller 23 can be prevented.
Further, since the plurality of balls 29 can be held from three directions by the raceway grooves 28 provided on both side surfaces of the roller 23, the plurality of balls 29 can be easily held at the time of assembly, and the assemblability is improved.

In each of the above embodiments, the thrust bearing plate, the roller bushing, and the spacer ring are made of carbon-impregnated ceramic. However, these are not limited to those made of carbon-impregnated ceramic, and may be any one having self-lubricating properties. It may be formed of a carbon coating metal, or may be formed of a heat resistant resin to which carbon fiber is added.
In addition, as a heat resistant resin, polyamide, polyether ketone, etc. can be used, for example.

  Further, the roller bearing applied to the roller bearing type chain of the embodiment as described above can also be applied to a yoke type track roller bearing and a stud type track roller bearing.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view of a main part of a roller bearing type chain that is Embodiment 1 of the present invention. XX sectional drawing in FIG. The thrust bearing board which is the example of a change of FIG. 1 is shown, (A) is the top view, (B) is the sectional drawing. Sectional drawing of the principal part of the roller bearing type | mold chain which is Example 2 of this invention. The YY sectional view taken on the line in FIG. The thrust bearing plate which is the example of a change of FIG. 4 is shown, (A) is the top view, (B) is the sectional drawing. Sectional drawing of the principal part of the roller bearing type | mold chain which is Example 3 of this invention. ZZ sectional drawing in FIG.

DESCRIPTION OF SYMBOLS 1 ... Inner plate 2 ... Bush 3 ... Roller 4 ... Needle roller 5 ... Outer plate 6 ... Connection pin 7, 7 '... Thrust bearing plate 7'a, ... ··· Track groove 8 ··· Track groove 9 ··· Ball 13 ··· Roller 14 · · · Needle roller 17'a ··· Track groove 17, 17 '··· Thrust bearing plate 18 ··· Track Groove 19 ... Ball 13a ... Roller body 13b ... Roller bushing 13c ... Annular step 23 ... Roller 23a ... Circular circular groove 24 in cross section 24 ... Cylindrical roller 27 ... Spacer ring 28 ... orbital groove 29 ... ball

Claims (2)

A pair of outer plates respectively arranged on both outer sides of the pair of inner plates connected by the bush are connected by a connecting pin rotatably inserted into the bush, and between the outer peripheral surface of the bush and the inner peripheral surface of the roller. In a roller bearing type chain in which a plurality of balls are rotatably mounted between a thrust bearing plate mounted on the outer periphery of the bush and a side surface of a roller facing the thrust bearing plate.
A roller bearing type chain characterized in that raceway grooves for holding the plurality of balls so as to roll freely from three directions are respectively provided on both side surfaces of the roller. A pair of outer plates respectively arranged on both outer sides of the pair of inner plates connected by the bush are connected by a connecting pin rotatably inserted into the bush, and between the outer peripheral surface of the bush and the inner peripheral surface of the roller. In roller bearing type chains incorporating multiple rollers in
A circular cross-sectional annular groove is provided on the inner diameter side of both side surfaces of the roller, a spacer ring is mounted on the outer periphery of the bush at a position facing the circular cross-sectional annular groove, and a plurality of rollers are provided on the inner surface of the spacer ring. A roller bearing type chain characterized in that a raceway groove is formed which supports an end face and holds a plurality of balls so as to roll freely from three directions by an outer surface of the spacer ring and an annular groove in cross section.

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