WO2003029027A1

WO2003029027A1 - Elastic wheel

Info

Publication number: WO2003029027A1
Application number: PCT/JP2002/009711
Authority: WO
Inventors: Hirohumi Kikuchi; Katsumi Tashiro
Original assignee: Bridgestone Corporation
Priority date: 2001-09-28
Filing date: 2002-09-20
Publication date: 2003-04-10
Also published as: JPWO2003029027A1

Abstract

An elastic wheel, comprising a disk (1) fixed to an axle hub and a rim (2) pivotally supporting a tire, wherein a pair of guides (5a, 5b) are fixedly installed annularly on the inner peripheral surface of the rim (2) and a projected part (4) annularly projected in the outer radial direction of a wheel is provided on the outer peripheral surface of the disk (1), a rubber elastic body (3) is annularly fixed to the projected part (4) while extending to at least both sides of the wheel in the axial direction and providing a clearance between the rubber elastic body and the inner peripheral surface of the rim (2), both end parts of the rubber elastic body (3) extending to the both sides in the axial direction are fixed to both side faces of the pair of guides (5a, 5b) opposed to each other in the axial direction of the wheel, and a coated material layer (6) is annularly installed on the inward surface of the rubber elastic body (3) in the radius direction of the wheel, whereby a riding comfortableness performance, a vibration isolation performance, and a sound isolation performance can be increased by increasing the weather resistance, injury resistance, and chemical resistance of a rubber used as a vibration isolation body without impairing durability and safety under loads ranging from a small input load to a large input load.

Description

Description Elastic wheel Technical field

The present invention relates to an elastic wheel used for a vehicle wheel, and more particularly, to an elastic wheel which is excellent in ride comfort, vibration proof performance, soundproof performance, and durability.冃:

The elastic wheel generally has a disc that can be fixed to the axle hub and a rim that supports the tire.A vibration isolator is provided between the disc and the rim to improve the vibration isolation performance and ride comfort. Various wheels have been proposed so far. For example, Japanese Unexamined Utility Model Publication No. 59-187870 proposes a tire wheel that improves ride comfort by using a panel as a vibration isolator.

It is also known that rubber is used as a vibration isolator and is disposed between the rim and the disc. For example, Japanese Utility Model Laid-Open No. 57-73203 discloses that the rim is made of rubber. An elastic wheel configured to be connected to a disk via a resilient body has been proposed. Further, Japanese Patent Application Laid-Open No. Hei 5-338410 discloses an elastic wheel in which a gap is formed between a rim and an elastic wheel, and a vibration-proof rubber is interposed in the gap. Further, WO98 / 33636 discloses a wheel / barrier assembly in which a rubber annular strip is arranged between an inner rim having the same profile as the rim and the rim. Have been.

However, in a conventional elastic wheel that uses rubber as the vibration isolator and arranges it uniformly between the rim and the disk, the rubber is vulcanized between the inner peripheral surface of the rim and the outer peripheral surface of the disk respectively. Since the bonded rubber elastic body is provided, the rubber elastic body can accurately suppress the axial, radial, and rotational vibrations transmitted from the rim to the disk, but when heavy load is applied. There is a problem that the displacement of the rubber elastic body cannot be suppressed. In other words, when the rubber section is uniform, It was difficult to obtain appropriate vibration-prevention characteristics in each case from to large input. In this regard, there was a similar problem even if a spring was used as the vibration isolator. In addition, elastic wheels using rubber as the vibration isolator may cause cracks on the surface due to environmental and physical factors such as ozone in the atmosphere and rocks that jumped up during actual use. Was also responsible for the premature destruction of rubber. Furthermore, since the rubber used as a vibration isolator is repeatedly subjected to a load as it is used, further improvement in fatigue durability during long-term use has been required.

Therefore, an object of the present invention is to improve the environmental resistance, damage resistance, and chemical resistance of rubber used as a vibration isolator, thereby impairing durability and safety from a small input to a large input. An object of the present invention is to provide an elastic wheel that improves ride comfort, vibration isolation performance, and sound insulation performance without improving performance. Disclosure of the invention

The present inventors have made intensive studies to solve the above-mentioned problems while maximizing the vibration suppressing effect of the rubber elastic body, and as a result, have found that the above-described object can be achieved by adopting the following configuration. The invention has been completed.

That is, an elastic wheel according to the present invention includes a disk fixed to an axle hub, a rim for supporting a tire, a pair of guides fixed to an inner peripheral surface of the rim in an annular shape, A protrusion protruding annularly outward in the radial direction of the wheel on the surface, extending at least on both sides in the wheel axial direction, with a gap between the protrusion and the inner peripheral surface of the rim, A rubber elastic body is fixed in a ring shape, and both ends of the rubber elastic body extending on both sides in the axial direction are elastic wheels fixed on both side surfaces of the pair of guides facing each other in the wheel axis direction. So,

A coating material layer is provided in a ring shape on a radially inner surface of the rubber elastic body in the wheel radial direction. As a result, vibration is absorbed by the shear deformation of the rubber elastic body interposed between the rim and the disk, and it is possible to improve the riding comfort performance, vibration isolation performance, and sound insulation performance especially for a small input. In addition, by properly protecting the rubber exposed outside the elastic wheel with a covering material, the rubber's environmental resistance, trauma resistance and chemical resistance are improved, and durability as a member is improved. , And elastic The durability of the wheel itself can be reliably increased. For soundproofing performance,

It is extremely effective for soundproofing in the high frequency range of 10 OHz or more.

Further, in the elastic wheel of the present invention, it is preferable that the rubber elastic body is integrally provided over the entire width between the pair of guides in the wheel axis direction. Thereby, in addition to the above-mentioned effects, large deformation at the time of large input can be satisfactorily prevented.

Further, the coating material layer is preferably a polyolefin. Thereby, the protective effect of rubber by the covering material layer can be more appropriately obtained.

Furthermore, the rubber elastic body preferably contains an ISAF-based carbon black. As a result, the rubber additives can be optimized, and the effect of improving the durability of the rubber can be better obtained.

Furthermore, in the elastic wheel of the present invention, the amount of shear strain of the rubber elastic body when the vehicle is loaded is preferably 15% or less. Thus, the durability of the rubber can be further improved by reducing the amount of shear strain of the rubber and suppressing the influence of repeated fatigue. BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is an enlarged partial sectional view of an elastic wheel according to one embodiment of the present invention. BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, embodiments of the present invention will be described.

An elastic wheel according to an embodiment of the present invention shown in FIG. 1 includes a disk 1 fixed to an axle hub (not shown), and a rim 2 for supporting a tire. A rubber elastic body 3 is annularly interposed between the surface and the outer peripheral surface of the disk 1.

In the preferred embodiment shown in the figure, the outer peripheral surface of the disc 1 integrally forms a projecting portion 4 that projects annularly outward in the wheel radial direction. A rubber elastic body 3 extending on both sides in the axial direction of the wheel has an appropriate gap between the protrusion 4 and the inner peripheral surface of the rim 2. For example, it is fixed in an annular shape by vulcanization bonding or the like.

On the other hand, a pair of guides 5a and 5b are fixed to the inner peripheral surface of the rim 2 in a ring shape, and both ends of the rubber elastic body 3 in the axial direction are formed by the pair of guides 5a and 5b. The rim 2 and the disc 1 are connected to each other via rubber elastic members 3 by being fixed to both side surfaces facing the wheel axis direction by vulcanization bonding or the like. The guides 5a and 5b may be fixed to the inner peripheral surface of the rim 2 by welding, screwing, or the like, or may be provided integrally with the rim.

The rubber elastic body 3 can exert its function as an elastic wheel due to its shear strain if it extends at least on the quotient side in the wheel axial direction. However, as shown in the figure, the rubber elastic body 3 has a pair of guides 5a, 5b, it is interposed integrally over the entire width in the wheel axis direction, i.e., the rubber elastic body 3 is also interposed between the inner peripheral surface of the rim 2 and the protrusion 4 of the disc 1, It becomes possible to correspond to the input. In other words, in this case, the portion of the rubber elastic body 3 that is present continuously on the outer surface in the wheel radial direction of the protrusion 4 prevents the collision between the protrusion 4 and the inner peripheral surface of the rim 2 during a large input. Demonstrates its function as a stove. In the illustrated example, the shape of the portion of the rubber elastic body 3 located between the inner peripheral surface of the rim 2 and the protrusion 4 of the disk 1 is made to protrude in correspondence with the protrusion 4. The rubber elastic body 3 may be formed flat over the entire width in the wheel axis direction between the grooves 5a and 5b. In any case, the shape of the entire rubber elastic body 3 is not particularly limited.

As shown in the drawing, a coating material layer 6 is provided in an annular shape on the inner surface of the rubber elastic body 3 in the wheel radial direction. The coating material layer 6 protects the surface of the rubber elastic body 3 that is exposed to the outside, so that the rubber elastic body 3 is not affected by environmental and physical factors, such as ozone in the air and rocks that have jumped up. Can be eliminated to prevent the occurrence of surface cracks. In addition, by selecting an appropriate material, chemical resistance and electrical resistance can be improved, and the durability of the rubber elastic body 3 itself is increased, thereby realizing an elastic wheel having excellent durability. be able to.

Further, in the present invention, the ratio of the width of the protrusion 4 in the wheel axial direction to the distance between both side surfaces of the pair of guides 5 a and 5 b facing each other in the wheel axial direction is set to be small, and the rubber elastic body 3 is formed. By increasing the volume, the rubber elastic body when the vehicle is loaded It is preferable to suppress the shear strain amount of No. 3 to 15% or less, particularly preferably 10% or less. As a result, the effect of the repeated load on the rubber elastic body 3 can be reduced, and the fatigue durability of the rubber elastic body 3 can be further improved.

The covering material layer 6 only needs to cover the exposed surface of the rubber elastic body 3, and the formation region, thickness, and the like are particularly limited as long as the protective effect of the rubber elastic body 3 can be appropriately obtained. There is no. As the material, a resin material having excellent environmental resistance and chemical resistance as described above and having good electric resistance can be appropriately selected and used, and preferably, for example, polyolefin is used.

The disk 1 may be a spoke wheel or a mesh wheel combined with a support such as a spoke-mesh. The disc may be made of any material such as steel, aluminum, magnesium, titanium, and synthetic resin. However, when the main focus is on light weight, aluminum, titanium or synthetic resin is preferable. The protrusion 4 is not limited to the example shown in the figure, but is provided with a base rim on the outer peripheral surface of the disk 1 and a rubber elastic body extending at least on both sides in the wheel axial direction is fixed to the outside in the radial direction. It may be provided by fixing an annular member that can be used. In the elastic wheel of the present invention, the structure of the rim 2 itself is not particularly limited. For example, a drop portion may be provided as shown in the figure to facilitate the rim assembly.

As the rubber elastic body 3 that can be used in the present invention, known rubber vibration insulators can be used, and natural rubbers and synthetic rubbers, for example, gen-based rubbers such as butadiene rubber, styrene-butadiene copolymer rubber, and butyl rubber It can be prepared by appropriately compounding a rubber with a compounding agent, for example, sulfur, a vulcanization accelerator, an antioxidant, and carbon black. Preferably, ISAF-based black is contained as carbon black. This is preferable because the durability of the rubber elastic body 3 can be further increased as compared with the case where an FEF system or the like is used. Of the rubber elastic body 3 JIS-A hardness (H d), from the viewpoint of the vibration absorption characteristics and durability, preferably 3 0 to 8 0 ° der is, the elastic modulus ^{^{lxl 0 3 ~ lxl 0 5 N}} / cm ² Industrial applicability As described above, according to the elastic wheel of the present invention, the rubber used as a vibration isolator has improved environmental resistance, trauma resistance, and chemical resistance, and has a durability from a small input to a large input. Ride comfort, vibration isolation, and sound insulation can be improved without compromising safety, safety, and steering stability.

Claims

The scope of the claims

1. A disk fixed to the axle hub and a rim for supporting the tire, a pair of guides fixed in an annular shape on the inner peripheral surface of the rim, and a wheel radius on the outer peripheral surface of the disk And a protrusion protruding annularly outward in the direction. The protrusion extends at least on both sides in the wheel axial direction, and has a gap between the inner peripheral surface of the rim and a rubber elasticity. An elastic wheel is provided in which the body is fixed in an annular shape and both ends of the rubber elastic body extending on both sides in the axial direction are fixed to both side surfaces of the pair of guides opposed to each other in the wheel axis direction. And

An elastic wheel, wherein a coating material layer is provided in a ring shape on an inner surface of the rubber elastic body in a wheel radial direction.

2. The elastic wheel according to claim 1, wherein the rubber elastic body is integrally provided over the entire width in the wheel axis direction between the pair of guides.

3. The elastic wheel according to claim 1, wherein said coating material layer is made of polyolefin.

4. The elastic wheel according to claim 1, wherein the rubber elastic body contains ISAF-based force black.

5. The elastic wheel according to claim 1, wherein the amount of shear strain of the rubber elastic body under a vehicle load is 15% or less.