JPH10166801A - Rubber elastic material segment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce heat or loses during high-speed continuous traveling by forming a hollow part in a rubber elastic material segment attached to the outer peripheral surface of a wheel rim including an endless track zone, a projecting part in the inner surface of this hollow part and a low friction material layer in the hollow part and/or the projecting part. SOLUTION: A rubber elastic material segment 1 loaded in the outer peripheral surface of a wheel rim including an endless track zone has a hollow part 2 formed in the wheel rim side and a projecting part 3 formed in this hollow part 2. The segment 1 and the projecting part 3 are integrally cured and molded by a rubber elastic material, and a plate 7 having an erected bolt 6 is buried in the bottom part of the segment 1. In this case, low friction material layers 20 are formed in the inner surface of the hollow part 2 and the outer surface of the projecting part 3. That is, Teflon is used for the low friction material, and Teflon coating is executed on this surface. Thus, almost no heat is produced by friction even if contact between the hollow part 2 and the projecting part 3 is repeated during traveling and the deterioration of rubber is prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wheel rim and an endless track belt (hereinafter simply referred to as a wheel rim in the present invention) for a civil engineering machine, a construction machine or a vehicle used in off-road, and to provide a driving force. The present invention relates to a resulting rubber elastic body segment for mounting a wheel rim (hereinafter simply referred to as a segment).

[0002]

2. Description of the Related Art Conventionally, there has been known a wheel completed by sequentially mounting hollow rubber elastic segments on a peripheral surface of a wheel rim successively with bolts, nuts and the like. For example,
There is a wheel disclosed in Japanese Patent No. 500485, but each segment has a shape longer in the width direction than the circumferential direction of the outer peripheral surface of the wheel rim, and has a hollow portion formed in the width direction. In this case, the side surfaces of the segments constituting the hollow portion are in contact with each other and support each other, and the vibration during the operation is reduced by deformation of the side surfaces.

FIG. 7 shows this conventional segment as a wheel rim r.
FIG. 8 is a side view when the camera is mounted on the camera. As can be seen from the figure, the segment S in this example is a V-shaped segment that bends at the center, and when mounted on the wheel rim r, the adjacent segments S are accurately positioned in the V-shape. become. In the segment S, a hollow portion a is formed in the width direction of the wheel rim r,
When a load is applied to the fuselage, the side portions b, b constituting the hollow portion a are deformed and come into contact with each other to support the gas.

However, actually, the supporting force due to the contact between the side portions b, b of the segment S mounted on the outer peripheral surface of the wheel rim r is relatively small. It is unavoidable that the deformation (distortion) of the side surface portion b of the segment S becomes large. Therefore, each segment S itself swings back and forth, resulting in poor stability such as vertical movement of the body. Was.

Further, since the side portions b, b of the segment S are always in contact with each other, frictional heat is generated due to friction between the side portions b, b of the segment S, for example, when the vehicle is operated at high speed. There is a disadvantage that the life is short due to melting of S or fuming. Although it depends on the rubber quality, according to our test, a running test at 50 Km / h per hour resulted in smoke emission in 9 minutes, and the side of the segment S was melted and broken.

However, in order to solve these drawbacks, the present applicant has already proposed an improved segment. In summary, the hollow portion of the segment is formed with a projection from the bottom, and an unscheduled segment is formed. It is a proposal to prevent further excessive deformation by causing the deformation of the segment to collide with the projection when a load is applied. For this reason, the vibration brought to the fuselage is reduced and the riding comfort is improved, and the swing such as pitching of the fuselage during excavation work is prevented.

[0007]

However, on the other hand, depending on the shape of the segment and the shape of the hollow portion, the contact between the inner surface of the hollow portion and the outer surface of the protrusion is repeated when the high-speed continuous running is performed. Even in this proposal, there are cases where the segments generate heat, and there are cases where further improvement is required.

According to the present invention, there is provided a rubber elastic body segment capable of running at high speed by reducing the frictional resistance between the inner surface of the hollow portion of the segment and the outer surface of the projection to reduce heat generation and loss due to contact between the members. It is intended to provide.

[0009]

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and the gist of the present invention is to provide a rubber elastic body segment which is sequentially mounted on the outer peripheral surface of a wheel rim. The segment has a hollow portion between the ground contact surface and the wheel rim, and a projection is formed in the hollow portion so as to face the inner surface of the hollow portion from the wheel rim side. The present invention relates to a rubber elastic body segment having a low friction material layer formed on an outer surface thereof.

The low friction material layer used here is:
Particularly, it is a Teflon resin layer, and more preferably, an ultrahigh molecular weight polyethylene resin layer.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A segment according to the present invention is cut into an appropriate length, and the above-described conventional segment is an example in which the longitudinal direction of the segment is fitted along the width direction of the wheel rim. However, it goes without saying that the segment may be mounted so that the longitudinal direction of the segment is aligned with the circumferential direction of the wheel rim.
This segment is generally formed of a vulcanized rubber as a whole, and in some cases, may be formed of a thermoplastic elastomer.

This segment has a hollow portion formed on the wheel rim side at least facing the ground contact surface portion.
Further, a projection is provided in the hollow portion from the wheel rim side toward the ground contact surface. To further describe the relationship between the hollow portion of the segment and the projection, the hollow portion is formed in the longitudinal direction of the rubber elastic body constituting the segment, and its end is open to the side of the segment. It may be a tunnel-like case or a shape in which the inside of the rubber elastic body is penetrated from the rim side. The protrusion is formed in the hollow portion, but may be integrated with the rubber elastic body constituting the segment, and the rubber elastic body and a separate protrusion are inserted into the hollow portion from the rim side. It may be something.

Here, an example of a segment employed in the present invention will be described in more detail. FIG. 1 is a sectional view showing a first example of a segment. In the drawing, reference numeral 1 denotes a segment, 2 denotes a hollow portion, and 3 denotes a projection formed in the hollow portion 2 toward the ground plane 4. In this case, the hollow portion 2 is an example in which it is opened in the longitudinal direction of the segment 1, and the segment 1 and the projection 3
Are vulcanized integrally with a rubber elastic body. A plate 7 having bolts 6 erected therein is embedded in the bottom of the segment 1, that is, in the fixing surface 5 with the rim. The bolt 6 is inserted into a play hole formed in a wheel rim (not shown) and fixed with a nut to be mounted. In this example, the fixing to the wheel rim has been described using the bolt 6, but a cap nut may be welded to the plate 7 and a bolt (not shown) may be screwed in from the rim side and fixed. . It goes without saying that the cap nut can be similarly applied to the following examples.

FIG. 2 is a sectional view of a second example of a segment, in which a projection 3 is formed separately from the segment 1 and a partial cutaway side view of the segment arranged toward the grounding surface 4 of the hollow portion 2 is shown. It is. Plate 8 in this projection 3
Is inserted into the play hole 10 formed in the bottom 5 of the segment 1 or the slit formed in the bottom 4 of the segment 1 to complete the segment 1.

FIG. 3 is a sectional view of a third example of a segment. In this example, the bottom 5 of the segment 1 has an opening 11 and the hollow portion 2 is formed so as to penetrate from the rim side.
Unlike the previous example, the periphery of the side surface of the hollow portion 2 is closed. The protruding portion 3 is inserted into the hollow portion 2 through the opening 11 and is arranged on the rim side separately from the rubber elastic body. With respect to the wheel rim, the segments 1 and the projections 3 are mounted independently.

According to the present invention, a low friction material layer is formed on one or both surfaces where the inner surface of the hollow portion and the outer surface of the projection contact each other, as in the above example. .
As the low friction material layer, for example, a Teflon resin layer, an ultra high molecular weight polyethylene resin layer, and a low friction rubber layer are formed. Examples of the Teflon resin layer include an inner surface of a hollow portion and / or
Alternatively, it is conceivable to coat a Teflon resin on the surface of the projection, and one ultrahigh molecular weight polyethylene is a polyethylene resin having a molecular weight of 500,000 or more, preferably 1,000,000 or more, more preferably 3,000,000 to 4,000,000, There is a method of setting this sheet in a mold when vulcanizing and molding a segment and performing vulcanization bonding.
The projections themselves may be formed from this ultrahigh molecular weight polyethylene. The low friction rubber layer is configured similarly to the case of ultra high molecular weight polyethylene.

[0017]

EXAMPLES Hereinafter, the present invention will be described in more detail with reference to Examples. FIG. 4 shows an example in which the low friction material layer of the present invention is applied to the segment shown in FIG. 1, and shows an example in which the low friction material layer is provided on the inner surface of the hollow portion 2 and the outer surface of the projection 3. In this example, Teflon is used as a low friction material, and a Teflon coating 20 is applied to the surface. In this example, the low friction material layer is provided on both the inner surface of the hollow portion 2 and the outer surface of the projection portion 3. However, the low friction material layer 20 may be provided on one of the surfaces. Good.

The segment 1 of the present invention comprises a low friction material layer 2 on at least one surface of the contact surface between the hollow portion 2 and the projection 3.
Since 0 was formed, heat generation due to friction hardly occurs even if contact during traveling is repeated, and the segment becomes an excellent segment without rubber deterioration.

FIG. 5 is an example in which the low friction material layer of the present invention is applied to the segment shown in FIG. 1, and the inner surface of the hollow portion 2 and the outer surface of the projection 3 are provided with the low friction material layer. Here is an example. In this example, an ultra-high molecular weight polyethylene sheet or a low friction rubber sheet may be bonded instead of the Teflon coating layer of the previous example as a low friction material. In this case, the sheet 30 is vulcanized. In some cases, the rubber elastic body of the segment itself is vulcanized and adhered together when the rubber elastic body of the segment itself is vulcanized. In this example, the low friction material layer is provided on both surfaces of the inner surface of the hollow portion 2 and the outer surface of the projection portion 3, but the low friction material layer 30 may be provided on one of the surfaces. It goes without saying that it is good.

FIG. 6 shows an example in which the present invention is applied to the segment shown in FIG. 2, in which a projection 3 separate from the segment shown in FIG. 2 is formed of an ultrahigh molecular weight polyethylene resin. The protrusion 3 forms the low friction material layer 40 as it is. In the segment of this example, means for applying a low friction material layer to the surface of the rubber elastic body is not required. Even in this case, a low friction material layer may be formed on the inner surface of the hollow portion 2.
Although not described, it goes without saying that the segment shown in FIG. 3 can be similarly configured.

[0021]

The segment of the present invention has the above-mentioned structure, and the low friction material layer is formed on at least one of the contact surfaces between the hollow portion and the projection, so that the contact during traveling is repeated. However, heat generation due to friction hardly occurs, and the segments are excellent without deterioration of rubber. Although the segment has been described as a straight line, it goes without saying that the present invention can be applied to a V-shaped segment as shown in the prior art.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a first example of a segment.

FIG. 2 is a sectional view of a second example of a segment.

FIG. 3 is a sectional view of a third example of a segment.

FIG. 4 is a sectional view in which the low friction material layer of the first example of the present invention is applied to the segment shown in FIG.

FIG. 5 is a sectional view in which the low friction material layer of the second example of the present invention is applied to the segment shown in FIG.

FIG. 6 is a sectional view in which the low friction material layer of the third example of the present invention is applied to the segment shown in FIG.

FIG. 7 is a plan view when a conventional segment is mounted on a wheel rim.

FIG. 8 is a side view of the segment of FIG. 7;

[Explanation of symbols]

1 ‥‥ segment, 2 ‥‥ hollow, 3 ‥‥ protrusion formed in the hollow, 4 ‥‥ segment grounding surface, 5 ‥‥ segment bottom, 6, 9 ‥‥ bolt, 7, 8 ‥‥ pressト, a play hole formed at the bottom of the 10 ‥‥ segment, an opening at the bottom of the 11 ‥‥ segment, 20 ‥‥ low friction material layer (Teflon coating), 30 ‥‥ low friction material layer (ultra high molecular weight polyethylene) See
G), a projection composed of a 40 ° low friction material layer.

Claims (3)

[Claims] 1. A rubber elastic body segment which is sequentially mounted on an outer peripheral surface of a wheel rim, the segment having a hollow portion between the ground surface and a wheel rim, and the hollow portion is provided in the hollow portion from the wheel rim side. A rubber elastic body segment in which a projection is formed facing the inner surface of the hollow portion, and a low friction material layer is formed on the inner surface of the hollow portion and / or the surface of the projection. 2. The rubber elastic body segment according to claim 1, wherein the low friction material layer is a Teflon resin layer. 3. The rubber elastic body segment according to claim 1, wherein the low friction material layer is an ultra high molecular weight polyethylene resin layer.