JP4449634B2 - Wheel structure - Google Patents

Description

  The present invention relates to a wheel structure for a vehicle.

2. Description of the Related Art Conventionally, a brake drum assembly structure in which an annular rib is formed on a contact surface between a hub flange and a drum is known (see, for example, Patent Document 1). By forming ribs on the contact surface of the hub flange, the contact area between the hub and the drum is reduced, and deformation of the hub is prevented from being transmitted to the drum.
JP 11-301202 A

  However, when the conventional brake drum assembly structure is applied to the contact surface between the wheel and the disk rotor, the wheel and the disk rotor are formed on the contact surface of the wheel when tightened with four or five bolts. The contact pressure of the rib portion is lower than the contact pressure of the contact surface near the fastening portion. In this state, when the vehicle turns at a low speed and an external load is applied to the wheel and the disc rotor, the rib portion having a low contact surface pressure slightly moves and rubs against the contact surface of the disc rotor to generate an abnormal sound (lipstick sound). .

  The present invention has been made to solve such problems, and a main object thereof is to provide a wheel structure that achieves low noise.

One aspect of the present invention for achieving the above object is a wheel structure including a wheel and a wheel component attached to the vehicle inside of the wheel, wherein the contact portion between the wheel and the wheel component includes: A substantially annular contact portion centering on the wheel center, the annular contact portion being locally divided along the circumferential direction, and an outer peripheral edge portion of the annular contact portion extending along the circumferential direction between the fastening portions of the plurality of hub bolts they become the wheel component and a non-contact Te, the contact portion is formed around the fastening portion of the hub bolts, the first contact portion a plurality of spaced apart in circumferential direction, The wheel structure includes a second contact portion that is formed closer to the center of the wheel than the first contact portion and is formed in a substantially annular shape around the wheel center.

  Moreover, in this one aspect | mode, the said wheel component is a disk rotor or a hub, for example.

According to this aspect, the annular contact portion between the wheel and the wheel component is locally divided along the circumferential direction, and the outer peripheral edge portion of the annular contact portion is along the circumferential direction between the fastening portions of the plurality of hub bolts is not turned to the wheel component and a non-contact, the contact portion is formed around the fastening portion of each hub bolts, the plurality of first spaced apart in circumferential direction The contact portion includes a contact portion and a second contact portion that is formed closer to the center of the wheel than the first contact portion and is formed in a substantially annular shape around the wheel center. Thereby, the part which becomes a low surface pressure among the contact parts between the said wheel and the said wheel component can be excluded, and the surface pressure of the said contact part becomes more uniform. Therefore, for example, when an external load is applied to the wheel and the wheel component, the portion of the contact surface between the wheel and the wheel component that has a low surface pressure is finely moved and rubs against the wheel and the wheel component. Therefore, it is possible to prevent the generation of abnormal noise. That is, it is possible to provide a wheel structure that achieves low noise.

  In these embodiments, the wheel component is, for example, a hub or a disk rotor.

  ADVANTAGE OF THE INVENTION According to this invention, the wheel structure which implement | achieved noise reduction can be provided.

  The best mode for carrying out the present invention will be described below with reference to the accompanying drawings. In addition, since the basic concept of a wheel structure, an operation principle, etc. are known to those skilled in the art, detailed description is abbreviate | omitted.

  FIG. 1 is a diagram illustrating a state in which a hub, a disk rotor, and a wheel are fastened.

  As shown in FIG. 1, in a wheel structure according to an embodiment of the present invention, a hub 2, a disk rotor 4, and a wheel 6 are connected by five hub bolts 8 in this order from the inside of the vehicle. The hub flange 2a of the hub 2, the hat portion 4a of the disc rotor 4, and the inner peripheral portion of the wheel 6 are respectively provided with five bolt holes 2b, 4b, 6b through which the hub bolt 8 is inserted. Each hub bolt 8 is inserted into each bolt hole 2b, 4b, 6b from the outside of the vehicle, and a nut 10 is screwed into the tip of the inserted hub bolt 8 from the inside of the vehicle, so that the hub 2, the disk rotor 4 and the wheel 6 are engaged. They are connected from the inside of the vehicle in this order. Bolts are planted in the hub 2, the planted bolts are inserted through the disk rotor 4 and the wheel 6, and nuts 10 are screwed into the distal ends of the inserted bolts from the outside of the vehicle. 4 and the wheel 6 may be connected from the inside of the vehicle in this order.

  Next, when the wheel 6 is fastened to the hub 2 and the disc rotor 4, the portion of the contact surface of the wheel 6 that comes into contact with the hat portion 4 a of the disc rotor 4 becomes a contact surface 4 c of the disc rotor 4. A method of cutting the contact surface of the wheel 6 so as to be non-contact will be described.

  FIG. 2A is a diagram showing the surface pressure distribution on the contact surface of the wheel 6. In FIG. 2A, when the hub 2, the disk rotor 4, and the wheel 6 are fastened, the surface pressure of the annular portion 6c indicated by the oblique lines is lowered. FIG. 2B is a view showing the contact surface 6a of the wheel 6 obtained by cutting the annular portion 6c in FIG. 2A, and the contact surface of the wheel 6 shown in FIG. 1 is viewed from the direction A (vehicle inner side). It is a partial enlarged view.

  As shown in FIG. 2A, the surface pressure of the five annular portions 6c formed between the bolt hole 6b of the wheel 6 and the adjacent bolt hole 6b is lowered.

  For example, when the vehicle turns at a low speed, an external load is applied to the wheel 6 and the disk rotor 4, and the wheel 6 and the disk rotor 4 are slightly deformed. When the wheel 6 and the disc rotor 4 are slightly deformed, the annular portion 6c having a low surface pressure of the contact surface 6a of the wheel 6 moves relative to the contact surface 4c of the hat portion 4a of the disc rotor 4. By this relative movement, the annular portion 6c of the contact surface 6a of the wheel 6 is rubbed against the contact surface 4c of the hat portion 4a of the disc rotor 4, and an abnormal noise (slip-sick sound) is generated.

  Therefore, as shown in FIG. 2 (b), cutting is performed on the annular portion 6c of the contact surface 6a of the wheel 6 where the surface pressure is reduced (hereinafter, the cut annular portion 6c is referred to as a cutting portion 6d). . By performing such a cutting process, the contact surface 6a of the wheel 6 is formed around the bolt holes 6b and is spaced from each other in the circumferential direction by five first contact portions 6e and the first contact portions 6e. A second contact portion 6f formed on the center side of the wheel 6 and formed in a substantially annular shape around the wheel center is formed. As a result, the annular portion 6c of the contact surface 6a of the wheel 6 and the contact surface 4c of the hat portion 4a of the disc rotor 4 are prevented from rubbing, and the generation of abnormal noise is prevented.

  Fig.3 (a) is a perspective view of the contact surface 6a of the wheel 6 shown in FIG.2 (b), and is an enlarged view of the cutting part 6d. Moreover, FIG.3 (b) is the figure which looked at the wheel 6 shown in FIG.2 (b) from the B direction, and is the elements on larger scale of the cutting part 6d. As shown in FIGS. 3A and 3B, the depth C of the cutting portion 6d of the contact surface 6a of the wheel 6 is about 1.0 mm.

  The depth C of the cutting portion 6d of the contact surface 6a of the wheel 6 is calculated as follows.

  First, the deformation amount of the annular portion 6c of the contact portion 6a of the wheel 6 is calculated based on the maximum load applied to the wheel 6 and the disc rotor 4 when the vehicle turns at a low speed, and the material of the wheel 6 and the disc rotor 4 and the like. . Based on the result of the vehicle test, it is assumed that the contact surface 4c of the hat portion 4a of the disc rotor 4 facing the cutting portion 6d of the wheel 6 bends about 30 μm at maximum in the axial direction D of the disc rotor 4. Therefore, the depth of about 1.0 mm, which is the cutting amount of the cutting portion 6d of the contact surface 6a of the wheel 6, is determined on the basis of the calculated deformation amount value of about 30 μm. Here, the cutting portion 6d of the contact surface 6a of the wheel 6 is cut by an NC machine tool or the like. A mold for the wheel 6 is designed based on the shape of the wheel 6 designed in this way, and the wheel 6 is molded based on the mold.

  As described above, by cutting the annular portion 6c of the contact surface 6a of the wheel 6 to a depth of about 30 μm, the maximum load is applied to the wheel 6 and the disk rotor 4 when the vehicle turns at a low speed, and the cut portion of the contact surface 6a of the wheel 6 is cut. The deformation amount of 6d may be the maximum. Even when the amount of deformation becomes maximum, the cutting portion 6d of the wheel 6 and the contact surface 4c of the hat portion 4a of the disk rotor 4 facing the cutting portion 6d do not come into contact with each other and are not rubbed (FIG. 3C). Therefore, the annular portion 6c of the contact surface 6a of the wheel 6 and the contact surface 4c of the hat portion 4a of the disc rotor 4 can be prevented from rubbing, and the generation of abnormal noise can be prevented. That is, it is possible to provide a wheel structure that realizes low noise.

  As mentioned above, although the best mode for carrying out the present invention has been described using one embodiment, the present invention is not limited to such one embodiment, and within the scope not departing from the gist of the present invention, Various modifications and substitutions can be made to the above-described embodiment.

  For example, in the embodiment described above, the annular portion 6c where the surface pressure on the contact surface 6a of the wheel 6 is reduced is cut so as not to contact the contact surface 4c of the hat portion 4a of the disk rotor 4. A mold is designed in advance so that the annular portion 6c where the surface pressure at the contact surface 6a of the wheel 6 becomes low is not in contact with the contact surface 4c of the hat portion 4a of the disc rotor 4, and the wheel 6 is integrally molded by this mold. May be. For example, a mold in which the first contact portion 6e and the second contact portion 6f are formed on the contact surface 6a of the wheel 6 may be designed in advance, and the wheel 6 may be integrally formed using the mold.

  Further, in the above embodiment, the annular portion 6c having a lower surface pressure is cut out of the contact surface 6a of the wheel 6 to form the deleted portion 6d. However, the disk rotor faces the annular portion 6c having a lower surface pressure. It is also possible to cut the contact surface 4c of the four hat portions 4a and form a deleted portion on the contact surface 4c on the disk rotor 4 side. Further, the contact surface 6a of the wheel 6 is cut by cutting the annular portion 6c of the contact surface 6a of the wheel 6 where the surface pressure is reduced, and further by cutting the contact surface 4c of the hat portion 4a of the disk rotor 4 facing the annular portion 6c. The deleted portion may be formed on both 6a and the contact surface 4c of the disk rotor 4.

  Furthermore, in the said one Example, although the wheel 6 is applied to the structure connected to the disk rotor 4, it is applicable also to the structure where the wheel 6 contacts the hub 2 and is connected.

  The present invention can be used for a wheel structure employed in a vehicle. The appearance, weight, size, running performance, etc. of the vehicle to be mounted are not limited.

It is a figure which shows the state in which the hub, the disc rotor, and the wheel were fastened. (A) It is a figure which shows the surface pressure distribution of the contact surface of a wheel. (B) It is a figure which shows the contact surface of the wheel which cut the annular part in (a), and is the elements on larger scale which looked at the contact surface of the wheel shown in FIG. 1 from the A direction (vehicle inside). (A) It is a perspective view of the contact surface of the wheel shown in FIG.2 (b), and is an enlarged view of a cutting part. (B) It is the figure which looked at the wheel shown in FIG.2 (b) from the B direction, and is the elements on larger scale of the cutting part. (C) It is a figure which shows the contact part of the hat part of the disc rotor facing the cutting part of the contact surface of a wheel, and a cutting part.

Explanation of symbols

2 Hub 2a Hub flange 2b Bolt hole 4 Disc rotor 4a Hat part 4b Bolt hole 4c Contact surface 6 Wheel 6a Contact surface 6b Bolt hole 6c Annular part 6d Cutting part 6e First contact part 6f Second contact part 8 Hub bolt 10 Nut

Claims (1)

In a wheel structure comprising a wheel and a wheel component attached to the vehicle inside of the wheel,
The contact portion between the wheel and the wheel component includes a substantially annular contact portion centered on the wheel center, and the annular contact portion is locally divided along the circumferential direction,
The outer peripheral edge portion in the annular contact portion is in non-contact with the wheel components between the fastening portions of the plurality of hub bolts along the circumferential direction .
The contact portion is formed around a fastening portion of each hub bolt, and is formed in a plurality of first contact portions that are spaced apart from each other in the circumferential direction, and is formed closer to the center of the wheel than the first contact portion. A wheel structure comprising: a second contact portion formed in a substantially annular shape.

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