JP4289204B2 - Disc rotor mounting structure - Google Patents

Description

  The present invention generally relates to a disk rotor mounting structure employed in a vehicle disk brake device, and more particularly to a disk rotor mounting structure that is lightweight and excellent in heat resistance.

2. Description of the Related Art Conventionally, in the field of a vehicle disc brake device, a disc rotor mounting structure is known in which a disc rotor that has been reduced in weight by eliminating a hat portion is attached to a hub flange portion from the vehicle inner side direction (for example, Patent Document 1).
JP 2003-206967 A

  However, in the conventional disk rotor mounting structure, a female screw is formed in the disk rotor itself, and the hub bolt and the disk rotor are directly screwed together.

  Thus, when a brake operation is performed while the vehicle is running, the disk rotor is thermally expanded due to frictional heat generated between the disk rotor and the brake pad, and a radial force is applied to the bolt. Designing bolts and / or disk rotors to withstand such forces results in increased weight. That is, with the conventional structure, it is difficult to achieve both weight reduction and improvement in heat resistance.

  The present invention has been made to solve such problems, and has as its main object to provide a disk rotor mounting structure that is lightweight and excellent in heat resistance.

One aspect of the present invention for achieving the above object is a disc rotor mounting structure that is employed in a disc brake device for a vehicle and in which the disc rotor is attached to the hub flange portion from the vehicle inner side direction. holding unit for holding one of a pair of fastening members for fixing the hub flange impossible rotate together is formed in the disc rotor Rutotomoni, the other of the pair of fastening members, said wheel and said hub flange A bolt hole formed in each of the disk rotors is inserted from the vehicle outer side direction, and one of the pair of fastening members is screwed to the other of the pair of fastening members, and a female screw is not formed on the hub flange portion. It is characterized by.

  In this aspect, the disk rotor has a substantially flat axial end surface in which a so-called hat portion is eliminated.

  In this aspect, the pair of fastening members is, for example, a bolt and a nut, and one of the pair of fastening members is, for example, a nut.

  Furthermore, in this one aspect, the holding portion is, for example, a recess or a hole formed in the disk rotor, and the rotation is, for example, when the nut is rotated integrally with the bolt when a rotational force is applied to the bolt. It refers to the situation where you do.

  According to this aspect, the disk rotor is connected to the hub as compared with a case where the disk rotor is directly fastened by, for example, a female screw being cut into a hole formed in the disk rotor and screwed to the hub flange. Since the fastening member for fixing to the flange portion is provided separately from the disk rotor, the thermal stress does not directly affect the fastening member and its fastening force even if thermal deformation occurs in the disk rotor. The heat resistance performance of the rotor mounting structure is improved.

Further, according to this aspect, since one of the fastening members is held so as not to be able to be rotated by the disk rotor, the assembly workability is not impaired even when a fastening member separate from the disk rotor is used. . In addition, since the other of the fastening members screwed to one of the fastening members is provided as a separate member, there is no need to form a female screw on the inner surface of the bolt hole of the hub flange portion, and the hub flange portion is thinned in the axial direction and light weight. Can be achieved.

  Note that in this one aspect, the holding portion includes the one of the pair of fastening members and the one of the pair of fastening members so that one of the pair of fastening members remains in its original position even when the disk rotor expands in the radial direction due to thermal deformation. The disk rotor is preferably formed to allow relative movement in the radial direction.

  In this aspect, the pair of fastening members may be general-purpose, but in order to engage and hold the disk rotor more easily and reliably, one of the pair of fastening members is used. Also, it is preferable that the shape is designed to correspond to the shape of the holding portion.

  According to the present invention, it is possible to provide a disk rotor mounting structure that is lightweight and excellent in heat resistance.

  Hereinafter, the best mode for carrying out the present invention will be described with reference to the accompanying drawings. The basic concept, main hardware configuration, operating principle, basic control method, and the like of the vehicle disc brake device are known to those skilled in the art, and thus detailed description thereof is omitted.

  FIG. 1 is a sectional view showing a disk rotor mounting structure according to an embodiment of the present invention. The disk rotor mounting structure according to this embodiment basically has a structure in which a hat rotor is abolished and the disk rotor, which has been reduced in weight, is mounted to the hub flange portion from the vehicle inner side direction as in the past.

  In the disc rotor mounting structure 2 according to this embodiment, the annular disc rotor 4 is assembled to the hub flange portion 6a of the hub 6 from the vehicle inner side direction, and the wheel 8 is attached to the hub flange portion 6a of the hub 6 in the vehicle. It is assembled from the outside direction.

  Further, the axle 6 is press-fitted into the inner ring inner periphery of the bearing 12 such as a bearing, and the outer ring outer periphery is press-fitted into a recess formed in the hub 6, so that the hub 6 is rotatably assembled to the axle 10.

  In the disk rotor mounting structure 2, four bolts 14 pass through bolt holes formed in the wheel 8, the hub 6, and the disk rotor 4 in this order from the vehicle outer side direction. Further, the four nuts 16 are respectively screwed with the four bolts 14 inserted from the vehicle rotor inside direction of the disc rotor 4 (FIG. 2).

  Here, the disk rotor 4 is made of, for example, cast iron or ceramic, and the nut 16 is made of, for example, steel or cast steel.

  In the present embodiment, as an example, the wheel 8, the hub 6 and the disk rotor 4 are coupled by four sets of bolts 14 and nuts 16, but the number of bolts 14 and nuts 16 used is arbitrary. Good. Further, a washer such as a spring washer may be interposed between the nut 16 and the disk rotor 4.

  FIG. 2 is a perspective view of the disk rotor 4 and the nut 16 in the disk rotor mounting structure 2 according to the present embodiment. FIG. 3A is a view showing the nut 16 and the disc rotor 4 before assembly. FIG. 3B is a view showing the nut 16 and the disc rotor 4 after assembly, and is a view of the I portion of FIG. 2 as viewed from the H direction (axial direction).

  As shown in FIG. 2, a plurality of (in this case, four) recesses 4a that are open radially inward are formed on the inner periphery of the annular disk rotor 4, and nuts 16 are fitted into the recesses 4a. Yes.

  As shown in FIG. 3, the nut 16 has two width portions 16 b and 16 c having two parallel surfaces, and a female screw 16 e is formed on the inner peripheral surface of the bolt hole formed in the center portion of the nut 16. Has been. Further, the concave portion 4a of the disk rotor 4 has two side width portions 4b and 4c having two opposite surfaces.

  The nut 16 is assembled to the concave portion 4a of the disk rotor 4 from the inner peripheral side toward the outer peripheral direction K (FIG. 3 (a)) (FIG. 3 (b)).

  In a state where the nut 16 is assembled and fitted into the recess 16a of the disc rotor 4, the two-sided width portions 16b and 16c of the nut 16 abut against the two-sided width portions 4b and 4c of the recess 4a of the disc rotor 4, respectively. Each nut 16 is held by each recess 4a.

  When the vehicle brake operation is performed, the sliding surface of the disc rotor 4 and the brake pad are brought into frictional contact, and frictional heat is generated at the contact surface of both. This frictional heat causes thermal deformation of the disk rotor 4 toward the radially outer side J (FIG. 2).

  Here, the recess 4a formed in the disk rotor 4 has a shape opened to the inside in the radial direction. Therefore, when the disk rotor 4 is deformed radially outward J, the nut 16 and the bolt 14 do not receive a radial force directly from the disk rotor 4.

  That is, the nut 16 is a separate member from the disk rotor 4 and is made of a different material, so that it is not thermally deformed integrally with the disk rotor 4. Moreover, since the relative movement in the radial direction between the nut 16 and the disk rotor 4 is allowed by the shape of the recess 4a opened radially inward, the nut 16 is circumferentially formed by the two-sided width portions 16b and 16c. Although it is fitted, it does not receive stress in the radial direction and remains in its original position.

  Therefore, the force in the radial direction J generated in the bolt 14 screwed with the nut 16 is also reduced, and it can be said that the heat resistance of the entire disc rotor mounting structure 2 is improved.

  As described above, according to the present embodiment, the heat resistance is improved in the disk rotor mounting structure in which the disk rotor 4 that has been lightened by eliminating the hat portion is attached to the hub flange portion 6a from the vehicle inner side direction. Therefore, the weight reduction and the heat resistance improvement of the disk rotor 4 can be realized at the same time.

  Further, since the abolishment of the hat portion is realized, the disk rotor 4 is prevented from being overturned and the surface is shaken. Therefore, the radial length of the hub flange portion 6a supporting the disc rotor 4 can be shortened and the weight can be reduced. .

Further, since the nut 16 that is screwed to the bolt 14 is provided as a separate member, there is no need to form a female screw on the inner peripheral surface of the bolt hole of the hub flange portion 6a, and the hub flange portion 6a is thinned in the axial direction to reduce weight. Can be achieved.

  Furthermore, since the nut 16 which is a separate member is held in a non-rotatable manner by the recess 4a of the disk rotor 4, it is possible to prevent the bolt 14 and the nut 16 from rotating around during assembly.

  By reducing the weight of the disk rotor mounting structure that does not impair the heat resistance, the vehicle as a whole can reduce the cost and reduce the so-called unsprung weight, thereby improving the fuel consumption rate. .

  In the above embodiment, the recess 4a formed on the inner periphery of the disk rotor 4 is open radially inward. However, the present invention is not limited to this, and the disk rotor 4 is thermally deformed. In this case, the disk rotor 4 and the nut 16 may have any shape as long as the relative movement in the radial direction is allowed, and may be closed radially inward.

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

It is sectional drawing of the disc rotor attachment structure which concerns on one Example of this invention. It is a perspective view showing the state where the nut was assembled to the disc rotor of the disc rotor attachment structure concerning one example of the present invention. (A) It is the elements on larger scale which show the state before a nut is assembled | attached to the disk rotor of the disk rotor attachment structure which concerns on one Example of this invention. (B) It is the elements on larger scale which show the state after a nut was assembled | attached to the disk rotor of the disk rotor attachment structure which concerns on one Example of this invention.

Explanation of symbols

2 Disc rotor mounting structure 4 Disc rotor 6 Hub 6a Hub flange 8 Wheel 14 Bolt 16 Nut

Claims (3)

In a disc rotor mounting structure that is employed in a vehicle disc brake device and the disc rotor is mounted from the vehicle inner side direction with respect to the hub flange portion,
The holding portion for holding one of the impossible co-rotation of a pair of fastening members for securing the disc rotor to the hub flange portion is formed in the disc rotor Rutotomoni,
The other of the pair of fastening members is inserted into a bolt hole formed in each of the wheel, the hub flange, and the disk rotor from the vehicle outer side, and one of the pair of fastening members is inserted into the other of the pair of fastening members. Is screwed,
A disc rotor mounting structure, wherein a female screw is not formed on the hub flange portion . The disk rotor mounting structure according to claim 1,
The disk rotor mounting structure, wherein the holding portion is formed to allow relative movement of one of the pair of fastening members and the disk rotor in a radial direction. The disk rotor mounting structure according to claim 1 or 2,
One of the pair of fastening members is designed to have a shape corresponding to the shape of the holding portion.

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