JPH08258501A - Multi-piece rim for construction machine - Google Patents

Abstract

PURPOSE: To prevent the fretting fatigue of the contact surfaces of a back flange and a side ring of a multi-piece rim for a construction machine. CONSTITUTION: In a multi-piece rim for a construction machine, an inserting member 1-3 independent of a back flange 4 and a side ring 6 is interposed between the back flange 4 and the side ring 6 whose axial direction is supported by it. It is desirable that the inserting member 13 is made of synthetic resin and that the thickness is set to 2 to 3mm.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-piece rim for a wheel of a construction machine vehicle.

[0002]

2. Description of the Related Art Since a tire for construction machinery has a high rigidity, a wheel rim 1 of a vehicle for construction machinery has a multi-piece structure as shown in FIG. In the multi-piece structure, the rim 1 includes a rim body 3 having a back flange 4 at one end and a gutter portion 5 at the other end, a side ring 6 axially supported by the back flange 4, and a gutter portion 5 side. Another side ring 7 and a bead seat band 8 that axially supports the side ring 7,
The lock ring 9 has one cut in the circumferential direction and is attached to the gutter groove 14 to support the bead seed band 8 from the axially outer side in the axial direction. Crim 10 for rim 1
Is fixed to the axle hub 11 with a bolt 12.

[0003]

In the multi-piece rim, due to the difference in rigidity between the members, a minute relative displacement occurs between the members during actual operation and when a load is applied, which causes a minute relative displacement between the members. Relative slip occurs. Particularly in the case of a rim wheel (demountable rim), relative sliding in the radial direction and the circumferential direction repeatedly occurs between the back flange 4 and the side ring 6, so that the contact surface between the back flange 4 and the side ring 6 In some cases, cracking may occur due to fretting fatigue and the durability of the rim may be significantly reduced. An object of the present invention is to provide a multi-piece rim for a construction machine capable of suppressing fretting fatigue of a contact surface between a back flange and a side ring axially supported by the back flange.

[0004]

The multi-piece rim for construction machine of the present invention which achieves the above object is as follows. (1) In a multi-piece rim for a construction machine having a rim body having a back flange at one axial end and a side ring axially supported by the back flange, between the back flange and the side ring, A multi-piece rim for construction equipment, wherein an insertion member made of a member different from the rim body and the side ring is interposed. (2) The construction machine multi-piece rim according to claim 1, wherein the material of the insertion member is a synthetic resin. (3) The thickness of the insertion member is 2 to 3 mm.
Multi-piece rim for construction equipment described.

[0005]

In the multi-piece rim for construction machine of the above (1), since the insertion member is interposed between the back flange and the side ring, the relative slip amount between the back flange and the insertion member, and the side ring and the insertion member. The relative slip amount is less than the relative slip amount between the back flange and the side ring when there is no insertion member, and the fretting fatigue of the contact surface between the back flange and the side ring with the insertion member is less than that when there is no insertion member. , Will be reduced. In the construction machine multi-piece rim described in (2) above, since the material of the insert member is synthetic resin, the contact surfaces of the back flange and the side ring with the insert member have good lubricity (sliding property) due to the synthetic resin. The fretting fatigue of the contact surfaces of the back flange and the side ring with the insertion member is further suppressed. In the construction machine multi-piece rim of the above (3), since the thickness of the insertion member is set to 2 to 3 mm, the rim width tolerance can be easily satisfied without changing the manufacturing size of the multi-piece rim.

[0006]

[Embodiment] The multi-piece rim for construction machine of the embodiment of the present invention is
The structure other than the insertion member 13 shown in FIG. 1 is the same as that of FIG. Therefore, as shown in FIG. 2, the rim 1 includes a rim body 3 having a back flange 4 at one end and a gutter portion 5 at the other end, a side ring 6 axially supported by the back flange 4, and a gutter portion. The other side ring 7 arranged on the 5 side, the bead seat band 8 that axially supports the side ring 7, and the bead seed band 8 that has one cut in the circumferential direction and is attached to the gutter groove 14 It has a lock ring 9 supported in the axial direction from the outside in the axial direction. The rim 1 is fixed to the axle hub 11 with bolts 12 by the clamp 10.

Multi-piece rim 1 for construction equipment according to an embodiment of the present invention
As shown in FIG. 1, an insertion member 13 which is a member separate from the rim body 3 and the side ring 6 is interposed between the back flange 4 and the side ring 6 on the back flange 4 side. The insertion member 13 is composed of an annular plate-shaped member and is attached and detached from the gutter portion 5 side. The insertion member 13 is considered as a consumable part and is replaced together when the tire 2 is replaced. The inner diameter of the insertion member 13 is slightly larger than the outer diameter of the insertion member mounting portion of the rim body 3, and the outer diameter of the insertion member 13 is equal to the outer diameter of the portion of the back flange 4 adjacent to the insertion member 13. It is desirable that they are the same or slightly larger.

Unlike the material of the rim body 3 (mild steel) and the material of the side ring 6 (mild steel), the material of the insertion member 13 is preferably made of synthetic resin. This synthetic resin contains
It is desirable to select one having abrasion resistance, for example, polyamide resin or ultra high molecular weight polyethylene. The proper thickness (thickness in the axial direction of the rim) of the insertion member 13 is
Although it depends on the wear resistance of the selected synthetic resin and the operating conditions of the vehicle, it is preferably 2 to 3 mm. 2mm is the limit value to prevent wear until the next tire change, 3mm
Is a value set because the rim width (L in FIG. 2) becomes narrower as the thickness increases, and the rim width tolerance (for example, ± 12.5 mm) cannot be satisfied. Further, if the thickness is increased, the tightening margin between the tire 2 and the rim 1 is also reduced, which causes tire slip (slip between the tire 2 and the rim 1), so 3 mm or less is desirable. However, the value of 3 mm may be increased to 5 mm at the upper limit.

Next, the operation will be described. During operation, relative displacement occurs between the back flange 4 and the side ring 6 due to the difference in rigidity between the members due to the load applied to the wheels during operation, and due to the torque, and a slight slip occurs in the rim radius and the circumferential direction. In the embodiment of the present invention, since the insertion member 13 is interposed between the back flange 4 and the side ring 6, the slip amount between the back flange 4 and the side ring 6 is the slip amount between the back flange 4 and the insertion member 13. When,
The back flange 4 and the insertion member 1 that is a member facing the back flange 4 are divided into the amount of slippage between the side ring 6 and the insertion member 13.
The relative slip amount with respect to 3 and the relative slip amount between the side ring 6 and the insert member 13 that is the member opposite thereto are equal to or less than the relative slip amount between the back flange 4 and the side ring 6 when the insert member 13 is not provided, Fretting fatigue of the back flange 4 and the side ring 6 with the insertion member 13 which is a facing member is reduced. This holds regardless of the material of the insert member 13.

When the material of the insert member 13 is a synthetic resin having abrasion resistance and slip property, for example, a polyamide resin, the lubricity of the contact surfaces of the back flange 4 and the side ring 6 with the insert member 13 is improved. Therefore, the surface can be easily slipped without being roughened, and the fretting fatigue of the contact surfaces of the back flange 4 and the side ring 6 with the insertion member 13 can be further suppressed.

By setting the thickness of the insert member 13 to 2 to 3 mm, the insert member 13 will not be worn and the back flange 4 and the side ring 6 will not be rubbed directly with each other until the next tire replacement, and the rim Tolerance of the rim width without changing the shape of the member (for example, ± 12.5m
m) can be easily satisfied. Further, the tightening margin between the tire 2 and the rim 1 is properly maintained, and tire slip does not occur.

[0012]

According to the multi-piece rim for construction equipment of the first aspect, since the back flange and the side ring are provided with the insertion member which is a member different from the back flange and the side ring, the back flange is provided. And of the side ring,
The amount of relative slip with the insert member that is the facing member is the relative slip with the facing member of the back flange and the side ring when there is no insert member (the facing member of the back flange is the side ring, and the facing member of the side ring is the back flange). It is less than the amount, and fretting fatigue on the sliding contact surface is suppressed. According to the multi-piece rim for construction equipment of claim 2, since the material of the insertion member is synthetic resin, the contact surface of the back flange with the insertion member and the contact surface of the side ring with the insertion member depend on relative sliding. Surface roughness is reduced and fretting fatigue is further suppressed. According to the multi-piece slim for construction machine of claim 3, since the thickness of the insertion member is set to 2 to 3 mm, even if the insertion member is inserted without changing the shape dimension of the rim constituent member, the rim width can be reduced. It can be easily fitted within the tolerance.

[Brief description of drawings]

FIG. 1 is an enlarged cross-sectional view of a back flange, a side ring, and the vicinity thereof of a multi-piece slim for construction machine according to an embodiment of the present invention.

FIG. 2 is a half cross-sectional view of a portion excluding an insertion member of the multi-piece slim for a construction machine according to an embodiment of the present invention and a conventional multi-piece slim for a construction machine.

[Explanation of symbols]

 1 rim 2 tire 4 back flange 6 side ring 13 insertion member

Claims (3)

[Claims] 1. A construction machine multi-piece rim having a rim body having a back flange at one axial end thereof and a side ring axially supported by the back flange, wherein the back flange and the side ring are provided. To
A multi-piece rim for construction equipment, wherein an insertion member made of a member different from the rim body and the side ring is interposed. 2. The construction machine multi-piece rim according to claim 1, wherein the material of the insertion member is a synthetic resin. 3. The multi-piece rim for a construction machine according to claim 1, wherein the thickness of the insertion member is 2 to 3 mm.