JP2002059703A - Elastic wheel with bore - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an elastic wheel with bores the spring characteristic of a damper of which has directiveness. SOLUTION: The elastic wheel with the bores is constituted by opening a plural number of the bores 32 made of through holes roughly in parallel with a wheel shaft center on a rubber member by holding the rubber member 31 larger in width in comparison with thickness between a rim 10 and a disc 20. The spring characteristic of the rubber member 31 is regulated by selecting a shape and the number of the bores 32.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a curled elastic wheel in which a rubber member for a damper is provided with a currant (a space such as a hole) so that the elastic characteristic of the rubber member has directionality.

[0002]

2. Description of the Related Art Elastic wheels for automobiles are systems that reduce road noise, reduce harshness, improve brake control performance, improve rutability, and improve wet handling performance. The goal is achieved by soft coupling in the body). In order to reduce road noise, it is necessary for the rubber member to have soft (small spring constant) characteristics in the plane (in the direction perpendicular to the wheel axis). It is necessary to have a soft (small spring constant) characteristic in the rotation direction (wheel rotation direction) in order to improve the performance. It is necessary to have characteristics of being hard (large spring constant) in the wheel axis direction and the direction parallel to the axis.

[0003]

However, the rubber member itself of the damper of the conventional elastic wheel for automobiles has the same spring characteristics in all directions, or the spring characteristics are not changed depending on the direction. Could not be satisfied at the maximum. SUMMARY OF THE INVENTION It is an object of the present invention to provide a curled elastic wheel in which a spring characteristic of a rubber member of a damper has directionality. SUMMARY OF THE INVENTION An object of the present invention is to provide a curled elastic wheel in which a garbage member is soft in an in-plane direction and a rotation direction and hard in a direction perpendicular to the plane.

[0004]

The present invention to achieve the above object is as follows. (1) A curb-filled elastic wheel in which a rubber member having a width larger than the thickness is sandwiched between a rim and a disc, and a plurality of currants having through holes parallel or substantially parallel to the wheel axis are formed in the rubber member. . (2) The elastic wheel with the currant according to (1), wherein the spring characteristic of the rubber member is adjusted by selecting the cross-sectional shape and the number of the currant. (3) The curl-filled elastic wheel according to (1), wherein a stopper is provided before and after the rim member in the wheel axis direction to prevent the rim and the disk from coming off when the rubber member is damaged. (4) The rubber member is divided into a plurality in the wheel axis direction,
The curled elastic wheel according to (1), wherein the divided rubber members have different diameters. (5) The curled elastic wheel according to (1), wherein a cross section of the rubber member is inclined with respect to a wheel axis. (6) The curl-filled elastic wheel according to (1), wherein the rubber member is vulcanized and bonded between a disc and a rim, and a detachment prevention mechanism is separately mounted.

[0005] In the above-mentioned (1) curled elastic wheel, since a plurality of currants having through holes parallel or substantially parallel to the wheel axis are formed in the rubber member, the rubber member has directionality in spring characteristics. The directionality of the rubber member is soft in the in-plane direction and the rotation direction, and hard in the perpendicular direction. for that reason,
An automobile equipped with an elastic wheel having this rubber member,
It satisfies all of reduction of road noise, reduction of harshness, improvement of brake control performance, improvement of rut, and improvement of wet handling performance. In the above-mentioned (2) curled elastic wheel, the spring characteristics are adjusted by selecting the cross-sectional shape and the number of the currants, so that it can be manufactured by a conventional manufacturing method, and a rubber member having directionality in the spring characteristics is specially prepared. It can be provided at low cost without using any material. The above (3)
Since the stopper is provided in the curled elastic wheel described above, even if the rubber member is damaged, the rim and the disk do not come off in the axial direction. In the above-described curled elastic wheel (4), since the rubber member is divided into two in the axial direction of the wheel and the diameters of the divided rubber members are different from each other, it is easy to insert the rubber member between the rim and the disk. . In this case, a large load can be prepared by increasing the capacity of the rubber member on the outer side in the wheel axis direction when mounted on the vehicle. In the curled elastic wheel of (5), since the cross section of the rubber member is inclined with respect to the wheel axis, the rubber member can be easily inserted between the rim and the disk. In the above-mentioned curled elastic wheel (6), the rubber member is vulcanized and bonded to the rim or the rim-side member fixed to the rim and vulcanized to the disk or the disk-side member fixed to the disk.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIGS. 1 to 5 show a curled elastic wheel according to a first embodiment of the present invention, and FIG. 6 shows a curled elastic wheel according to a second embodiment of the present invention.
FIG. 8 shows a currant-containing elastic wheel of Example 3 of the present invention, FIG. 8 shows a currant-containing elastic wheel of Example 4 of the present invention, and FIGS. 9 to 12 show currants of Example 5 of the present invention. Figure 2 shows an entering elastic wheel. Structural parts that are common to or similar to all embodiments of the present invention are given the same reference numerals throughout all embodiments of the present invention.

First, the structure of a structural part common or similar to all embodiments of the present invention will be described with reference to, for example, FIGS. The curled elastic wheel of the present invention includes a rim 10, a disk 20, and a damper 30.

The rim 10 is made of metal, for example, aluminum or steel. The rim 10 may have a shape having a drop portion, or may have a dropless shape as shown in FIG. In the case of dropless, as shown in FIG. 1, in order to enable the tire 40 to be mounted on the rim 10, the rim flange 11 on one side is detachable from the remaining portion (rim main body) 12 of the rim. After inserting the one-side rim flange 11 into the rim main body 12, the rim flange 11 is rotated and axially engaged with the engaging portion 13, and is prevented from rotating with the bolt 14 or the like.
A sealing material 15 is provided. The disk 20 is made of metal or resin, and in the case of metal, is made of aluminum or steel. By making the rim 10 dropless, a space is created between the rim 10 and the disc 20 in the radial direction of the wheel as compared with a rim having a drop portion, and the damper 30 is mounted in that space.

The damper 30 has a rubber member 31.
The rubber member 31 is sandwiched between the rim 10 and the disk 20, has a width W larger than the thickness T, and extends over the entire circumference in the wheel circumferential direction. As shown in FIG. 2, the rubber member 31 is provided with a plurality of curls 32 having through holes parallel to or substantially parallel to the wheel axis (within ± 10 ° of the wheel axis). A plurality (many) of the curls 32 are provided at equal pitches in the wheel circumferential direction. The rubber member 31 is connected to the rim 1
0 or the rim-side member fixed to the rim 10 and the disk 20 or the disk-side member fixed to the disk 20 by vulcanization bonding or by being knurled and pressed against the surface. , Has been fixed.

[0010] By forming the currant 32 from a through hole parallel or substantially parallel to the wheel axis, the hardness in the in-plane direction and the rotation direction can be reduced without substantially reducing the hardness in the direction perpendicular to the plane. As a result, the spring characteristics of the rubber member 31 become directional. The spring characteristics of the rubber member 31 in each direction are adjusted by selecting the cross-sectional shape and the number of the curls 32. In FIG. 2, the cross-sectional shape of each of the currants 32 is circular, but is not limited to a circle, and may be a polygon (FIG. 6), an ellipse,
Still other shapes may be used.

At the front and rear of the rubber member 31 in the direction of the wheel axis, there are provided stoppers 50 for preventing one of the rim 10 and the disc 20 from slipping off in the wheel axis direction with respect to the other when the rubber member 31 is damaged. The stoppers 50 of the rubber member 31 at the front and rear sides in the wheel axis direction overlap each other in the wheel radial direction, and cannot be removed in the axial direction.

First, the operation of a structural part common or similar to all the embodiments of the present invention will be described with reference to FIGS.
With reference to FIG. As shown in FIG. 13, the rubber member 3 is formed by a
1 is that the hardness of the rubber in the wheel surface direction and the hardness of the rubber in the wheel rotation direction are
And the hardness of the rubber in the direction perpendicular to the wheel surface is hardly reduced. Then, as the length of the rubber member 31 in the direction perpendicular to the plane is larger, the hardness of the rubber in the direction perpendicular to the wheel surface is hardly reduced.

The main requirements of an elastic wheel for a vehicle are to reduce road noise, reduce harshness, improve brake control performance, improve rut, and improve wet handling performance. The currant 32 composed of a through hole extending in a direction perpendicular to the plane acts to promote the above-described requirements, as described below.

Reduction of Road Noise A dynamic damper having a rim 10 as a mass and a rubber member 31 as a spring and having a resonance point of around 100 Hz reduces the transmission of vibration (150 to 400 Hz) from the tire to the axle to reduce road noise. Suppress. Target resonance point (100H
z), the spring constant is about 2-3 KN / m
m, which requires a soft spring in the in-plane direction (vertical direction). The currant 32 reduces the spring constant of the rubber member 31 in the in-plane direction.
1 makes it easier to achieve the target spring constant. Since the spring constant of the rubber member 31 is reduced by the curls 32, the rubber member 3
It is not necessary to increase the thickness of 1 and the brake space is not narrowed.

Reduction of harshness (front and rear shocks) Since the rubber member 31 provided with the curls 32 provides compliance (looseness) in the rotational direction, front and rear shocks entering from the tires when the vehicle rides over the protrusion 61 (FIG. 14) are alleviated. In addition, the body movement and noise (harshness) are reduced.

In the brake control such as ABS, the torque for recovering the rotation of the tire is obtained only from the frictional force between the tire and the road surface. Torque), the torque to be recovered is small, and as a result, the control tends to be rough. In the elastic wheel, energy is accumulated in the rubber member 31 during braking, and when the braking is loosened, the energy acts on the side to return the rotation, so that the rotation returns quickly (FIG. 15), and fine control can be performed. As a result, for example, in ABS, the stopping distance of the vehicle is reduced.
In this case as well, a soft spring is required in the rim rotation direction, but the rubber member 31 provided with the curls 32 is soft in the rim rotation direction and can exhibit necessary characteristics.

Improving Rutting Rutting occurs because the tire tread surface cannot follow the slope of the rut and the contact pressure does not become uniform, so that the performance of the tire cannot be fully drawn. With elastic wheels,
Since the angle of the rim with respect to the disc is inclined in a direction that conforms to the inclination of the road surface, the uniformity of the contact pressure is maintained, so that the tire performance can be sufficiently brought out and rutting is reduced (FIG. 1).
6). In order to reduce rutting, it is necessary that the damper be soft with respect to the rim swinging moment. However, since the rubber member 31 is provided with the curb 32, the rubber member 31 has a rim swinging moment. To soften, and act to further improve rut reduction.

Improvement of wet handling performance With an elastic wheel, grip is improved when turning on a wet road, and the lateral acceleration of the vehicle is increased. This is because even if each camber becomes large due to the vehicle roll during turning, the contact pressure distribution is not likely to be uneven, so a soft damper against the rim swing moment is necessary as in the case of rutted. is there. Since the curls 32 are provided on the rubber member 31, the rubber member 31 is softened with respect to the moment in the swinging direction of the rim, and acts to further improve the wet handling performance.

Next, the configuration and operation of the parts unique to each embodiment of the present invention will be described. In the first embodiment of the present invention, FIGS.
As shown in FIG. 5, the rim 10 is a dropless rim made of aluminum, and the disc 20 is made of aluminum or resin.
The rubber member 31 is subjected to knurling on the rim 10 and the disk 20 to be pressure-bonded, and the curb 32 has a through hole having a circular cross section. Stopper 50 is rim 10, disk 2
0 to prevent the damper 30 from coming off when it is damaged. FIG. 5 shows an assembling order, in which the disk 20
Is inserted into the rim 10 in the direction of the arrow. In this case, the contact surface pressure is increased by making the inner diameter of the rubber member 31 smaller than the outer diameter of the disk 20 and making the outer diameter of the rubber member 31 larger than the inner diameter of the rim 10. The rim edge is attached to the rim body after mounting the tire.

In the second embodiment of the present invention, as shown in FIG. 6, the hardness of the rubber is adjusted by the hole shape, size, and number of the curls 32. FIG. 6 shows that the hole shape of the currant 32 is polygonal (for example, hexagonal, but may be square, octagonal, etc.).
Is shown.

In the third embodiment of the present invention, as shown in FIG. 7, the rubber member 31 is divided into a plurality of parts (for example, two parts) in the wheel axis direction, and the diameters of the divided rubber members are different from each other. The stopper 50 is welded after assembling. The number of the stoppers 50 welded after assembly is one. The assembling procedure is as follows.
Then, the disk 20 with the rubber member 31 is pushed into the rim 10 so that the rubber member 31 having a small outer diameter is inserted into the rim first. Thereby, the rim 1
Insertion into 0 and assembling become easy. When mounted on a vehicle, the split rubber member located on the outside in the wheel axis direction is made larger than the split rubber member located on the inside in the wheel axis direction. This is because the divided rubber member located on the outer side in the axial direction of the wheel receives a larger load, so that it can cope therewith.

In the fourth embodiment of the present invention, as shown in FIG. 8, the rubber member 31 has a truncated conical damper 31 in which the cross section of the rubber member 31 is inclined with respect to the wheel axis. The assembling procedure is assembling the rubber member 31 to the disk 20, and then inserting the rubber member-equipped disk into the rim 10 in a direction in which the tapered portion of the rubber member 31 having the smaller diameter is inserted into the rim 10 first. And assemble. This facilitates insertion into the rim 10 and assembly. Finally, the stopper 50 is welded to the rim 10.

In the fifth embodiment of the present invention, as shown in FIGS. 9 to 12, the rubber member 31 is vulcanized and bonded between the rim 10 and the disk 20, and the detachment preventing mechanism 51 is separately mounted. I have. The rubber member 31 is vulcanized and bonded to the rim 10 or the rim-side member fixed to the rim 10 and the disk 20 or the disk-side member fixed to the disk 20. Since the curls 32 are opened in the wheel axis direction, the core can be easily removed after vulcanization. In the case of the vulcanization bonding type, it is necessary to leave a space for a vulcanizing mold on both sides of the rubber member 31 in the wheel axis direction.
1 cannot be provided with a stopper, and the disengagement prevention mechanism 51 is provided separately from the stopper at a position separated from the rubber member 31 by a distance equal to or more than the mold insertion space in the wheel axis direction.
A plurality of portions are provided in the circumferential direction of the wheel. Detachment prevention mechanism 5
1 is, for example, welded to the rim 10, extends radially inward, and enters and engages a hole formed in the disk 20. The rim flange 11 on one side is configured to be detachable from the remaining portion (rim main body) 12 of the rim, and is rotated after the rim flange 11 is inserted into the rim main body 12 to be rotated.
At 3, the rim body 12 is engaged with the rim body 12 in the wheel axis direction, is stopped from rotating by a bolt 14 or the like, and a sealing material 15 is provided.

[0024]

According to the first aspect of the present invention, since a plurality of currants having through holes parallel or substantially parallel to the wheel axis are formed in the rubber member, the rubber member has directionality in spring characteristics. . The directionality of the rubber member is soft in the in-plane direction and the rotation direction, and hard in the perpendicular direction. Therefore, an automobile equipped with an elastic wheel having this rubber member satisfies all of the following: reduction of road noise, reduction of harshness, improvement of brake control performance, improvement of rut, and improvement of wet handling performance. According to the elastic wheel with the currant according to the second aspect, the same effect as in the first aspect is obtained, and since the spring characteristics are adjusted by selecting the cross-sectional shape and the number of the currant, it can be manufactured by the conventional manufacturing method. In addition, a rubber member having a directional spring characteristic can be provided at low cost without using a special material. According to the third aspect of the present invention, the same effect as in the first aspect can be obtained, and the stopper is provided. Therefore, even if the rubber member is damaged, the rim and the disk do not come off in the axial direction. Absent. According to the curled elastic wheel of the fourth aspect, the same effect as the first aspect is obtained. In addition, the rubber member is divided into a plurality of pieces in the wheel axis direction, and the diameters of the divided rubber members are different from each other. The member can be easily inserted between the rim and the disk. In this case, a large load can be prepared by increasing the capacity of the rubber member on the outer side in the wheel axis direction when mounted on the vehicle. According to the elastic wheel with the currant according to the fifth aspect, the same effect as the first aspect is obtained. In addition, since the cross section of the rubber member is inclined with respect to the wheel axis, the rubber member can be inserted between the rim and the disc. Easy. According to the sixth aspect of the present invention, the same effect as the first aspect can be obtained.

[Brief description of the drawings]

FIG. 1 is a half sectional view of a curled elastic wheel according to a first embodiment of the present invention.

FIG. 2 is a front view of a quarter of a rubber member in FIG.

FIG. 3 is an enlarged sectional view of a rubber member and its vicinity in FIG.

FIG. 4 is an enlarged front view of the rubber member of FIG. 3 and its vicinity.

FIG. 5 is an exploded sectional view showing how to assemble the wheel of FIG. 1;

FIG. 6 is a front view of a rubber member and a part of the vicinity thereof in a curled elastic wheel according to a second embodiment of the present invention.

FIG. 7 is a cross-sectional view of a part of a curled elastic wheel according to a third embodiment of the present invention.

FIG. 8 is a cross-sectional view of a part of a curled elastic wheel according to a fourth embodiment of the present invention.

FIG. 9 is a half sectional view of a curled elastic wheel according to a fifth embodiment of the present invention.

FIG. 10 is a front view of a quarter of FIG. 1 as viewed from the back side.

FIG. 11 is a front view of a quarter of FIG. 1 viewed from the front side.

FIG. 12 is a sectional view taken along line AA of FIG. 11;

FIG. 13 is a diagram showing each direction of an elastic wheel.

FIG. 14 is a schematic side view of an elastic wheel.

FIG. 15 is a graph showing the speed of rotation return of the elastic wheel and the normal wheel (wheel without damper).

FIG. 16 is a graph of an elastic wheel, a normal wheel (wheel without a damper) and its contact pressure in a rutted state.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Rim 11 One side rim flange part 12 Rim main body 13 Engagement part 14 Bolt 15 Sealing material 20 Disk 30 Damper 31 Rubber member 32 Curtain 40 Tire 50 Stopper 51 Disengagement prevention mechanism 61 Projection

Claims (6)

[Claims] A rubber member having a width larger than a thickness is sandwiched between a rim and a disc, and a plurality of currants having through holes parallel or substantially parallel to a wheel axis are formed in the rubber member. Elastic wheel. 2. The curled elastic wheel according to claim 1, wherein a spring characteristic of the rubber member is adjusted by selecting a cross-sectional shape and a number of the currant. 3. A front-back direction of the rubber member in a wheel axis direction,
2. The curled elastic wheel according to claim 1, further comprising a stopper for preventing the rim and the disk from coming off when the rubber member is damaged. 4. The curb-filled elastic wheel according to claim 1, wherein said rubber member is divided into a plurality of parts in the wheel axis direction, and the divided rubber members have different diameters. 5. The curled elastic wheel according to claim 1, wherein a cross section of said rubber member is inclined with respect to a wheel axis. 6. The curly-filled elastic wheel according to claim 1, wherein said rubber member is vulcanized and bonded between a disc and a rim, and a detachment preventing mechanism is separately provided.