JPH068829U - Brake device for vehicle - Google Patents

Abstract

(57) [Abstract] [Purpose] To effectively prevent the friction heat generated during braking from being transmitted to the bearing of the axle shaft. In a vehicle brake device having a disc rotor 7 mounted on a wheel hub 6, a mounting substrate 8 fixed to the wheel hub 6, a tubular portion 9 extending from the outer peripheral portion to the vehicle outer side, and an inner end thereof. The disk rotor 7 is constituted by the disk-shaped disk portion 10 extending from the above portion to the outer peripheral direction, and a large number of ribs 11 are radially provided on the outer peripheral surface of the tubular portion 9 of the disk rotor 7 to radiate the rib 11. It is configured to be used as a plate.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an improvement of a vehicle brake device that applies a braking force by pressing a friction member against a disc rotor.

[0002]

[Prior art]

 Conventionally, for example, as disclosed in Japanese Utility Model Publication No. 63-50504, an annular mounting portion mounted on an axle shaft, a tubular flange portion provided on the outer peripheral portion thereof, and an inner end portion of the tubular flange portion. A vehicle brake device is known in which a disc rotor including a protruding annular sliding portion is provided, and a brake pad is pressed against the annular sliding portion so as to apply a braking force. There is.

[0003]

[Problems to be solved by the device]

 In the above brake device, a large number of vent holes extending in the radial direction are formed in the annular sliding portion of the disc rotor, and cooling air is circulated through the vent holes, so that the annular sliding portion heated at the time of braking is formed. Is being cooled quickly. However, even in the braking device having the above structure, it is not possible to prevent the frictional heat generated during braking from being transmitted from the base end portion of the disk rotor to the bearing or the like provided on the axle shaft. It was necessary to use expensive bearings to prevent the deterioration of durability caused by the influence.

In particular, when the disc rotor is made of a light alloy material such as an aluminum alloy in order to reduce the weight of the brake device, the thermal conductivity of the disc rotor is high, so that the friction heat transmitted to the axle shaft causes the bearing to rotate. Has a problem that it is easily affected by heat. However, in order to sufficiently secure the strength of the disk rotor, it is necessary to increase its plate thickness, which causes a problem of high material cost.

The present invention has been made to solve the above problems, and is capable of effectively preventing friction heat generated during braking from being transmitted to the bearing of the axle shaft. The purpose is to provide a device.

[0006]

[Means for Solving the Problems]

 According to a first aspect of the present invention, in a vehicle brake device having a disc rotor mounted on a wheel hub, a mounting substrate fixed to the wheel hub, a tubular portion extending from the outer peripheral portion to the vehicle outer side, and an inner portion thereof are provided. A disc-shaped disc portion extending from the end portion in the outer peripheral direction is provided on the disc rotor, and a large number of ribs are radially provided on the outer peripheral surface of the tubular portion.

According to a second aspect of the present invention, a protrusion is provided on one of the joint surfaces of the wheel hub and the disc rotor, and the end face of the protrusion is brought into contact with the other of the joint surfaces, and the disc rotor is contacted. And the wheel hub are integrally connected.

According to a third aspect of the present invention, the mounting substrate and the tubular portion of the disc rotor are formed of a light alloy casting material, and the tubular portion has a holding portion for holding the base end portion of the disc portion. It was set up.

[0009]

[Action]

 According to the invention described in claim 1, a large number of ribs provided on the cylindrical body of the disk rotor function as a heat radiating plate, and friction heat generated in the disk portion is passed through the cylindrical portion and the mounting substrate to the wheel. It is effectively prevented from being transmitted to a hub or the like.

According to the second aspect of the invention, the joint surface of the wheel hub and the mounting base plate of the disc rotor are connected to each other via the protrusion provided on one side of the wheel hub or the disc rotor. As a result, the two are phase-bonded in a state where they are partially in contact with each other.

According to the third aspect of the present invention, the disc portion is formed of cast iron material or the like separately from the attachment base plate and the tubular portion, and the disc is placed in a mold for forming the tubular portion. With the hollow portion installed, a molten alloy of a light alloy material is cast into the mold, so that the base end portion of the disc portion is held by the holding portion provided in the tubular portion. Will be formed.

[0012]

【Example】

 FIG. 1 shows an embodiment of a brake device according to the present invention. This brake device includes a knuckle arm 1 supported by a vehicle body via a suspension arm and a shock absorber (not shown), and an axle rotatably supported by the knuckle arm 1 via a bearing 2 and seal 3 material. It has a shaft 4, a wheel hub 6 fastened to the end of the axle shaft 4 by a nut 5, and a disc rotor 7 attached to the wheel hub 6.

As shown in FIGS. 2 to 4, the disc rotor 7 has a disc-shaped mounting substrate 8 fixed to the wheel hub 6 with bolts, and extends from the outer peripheral portion of the mounting substrate 8 to the outside of the vehicle. A tubular portion 9 and a disc-shaped disk portion 10 extending from the outer end portion of the tubular portion 9 to the outer peripheral direction are provided, and the mounting substrate 8 and the tubular portion 9 are cast from a light alloy such as aluminum alloy. It is integrally formed by the material.

A large number of ribs 11 having a predetermined height are radially projected on the outer peripheral surface of the tubular portion 9, and the inner end portion of the rib portion 11 holds the base end portion of the disc portion 10. The holding portion 12 is formed. The disc portion 10 of the disc rotor 7 is formed of cast iron material or the like separately from the mounting substrate 8 and the tubular portion 9. A bulging portion 13 for connection is circumferentially formed at the base end portion of the disc portion 10. Are formed at predetermined intervals. Then, when the tubular portion 9 is cast-molded, the disc portion 10 is set in the mold, and the holding material 12 is injected by injecting a casting material so as to surround the bulging portion 13. The holding portion 12 is formed so as to integrally connect the tubular portion 9 and the disc portion 10.

The wheel hub 6 has a cylindrical support portion 14 for supporting the axle shaft 4 and a flange portion 15 projecting from an outer peripheral surface of the support portion 14, and the flange portion 15 is used for the disc portion. It is configured to be bolted to the mounting substrate 8 of the rotor 7. A plurality of protrusions 16 having a predetermined height are provided on the joint surface of the flange portion 15 at predetermined intervals in the circumferential direction, and the inner end faces of the protrusions 16 are joined to the joint surface of the mounting substrate 8. In the abutting state, the disc rotor 7 and the wheel hub 6 are integrally connected.

As described above, the mounting substrate 8 and the cylindrical portion 9 of the disc rotor 7 and the disc portion 10 held by the friction member provided on the caliper (not shown) are separately formed, and the mounting substrate 8 described above is formed. Since the tubular portion 9 is made of a light alloy material and the disc portion 10 is made of a cast iron material, the weight of the disc rotor 7 as a whole is reduced while ensuring sufficient durability of the disc portion 10. be able to.

Since a large number of ribs 11 are provided on the outer peripheral portion of the tubular body 9, friction heat generated by pressing the friction member against the disk portion 10 by using the ribs 11 as a heat dissipation plate Can be effectively dissipated at the installation portion of the rib 11.

Therefore, even though the mounting substrate 8 and the tubular portion 9 of the disk rotor 7 are formed of a light alloy material such as an aluminum alloy, the friction heat causes the bearing 2 and the like that support the axle shaft 4 to rotate. It can be effectively prevented from being transmitted. Moreover, since the holding portion 12 of the disc portion 10 and the like can be effectively reinforced by providing the rib 11, the rigidity of the disc rotor 7 can be sufficiently increased without setting the plate thickness so large. Can be secured.

Further, as described above, the projecting piece 16 is provided on the joint surface of the wheel hub 6, and the inner end portion of the projecting piece 16 is brought into contact with the joint surface of the disc rotor 7. When the disc rotor 7 and the wheel hub 6 are connected to each other, the contact area can be made smaller than in the case where the disc rotor 7 and the wheel hub 6 are in surface contact with each other. The amount of heat transferred to the wheel hub 6 can be significantly reduced, and the bearing 2 provided on the wheel hub 6 can be effectively prevented from being affected by heat.

The protrusion 16 provided on the wheel hub 6 is omitted, and a protrusion having a predetermined height is provided on the joint surface of the disk rotor 7, that is, the wall surface of the mounting substrate 8 on the vehicle outer side. The disc rotor 7 and the wheel hub 6 may be connected to each other in a state where the outer end surface of the piece is in contact with the joint surface of the wheel hub 6. With such a configuration, there is an advantage that the mounting board 8 and the tubular portion 9 of the disk rotor 7 can be reinforced by the projecting piece and the rigidity thereof can be further increased.

[0021]

[Effect of device]

 As described above, according to the present invention, since a large number of ribs are radially provided on the outer peripheral portion of the cylindrical body forming the disc rotor, the friction heat generated by the friction member being pressed against the disc portion is It can be effectively dissipated at the rib installation part. Therefore, even when the mounting substrate mounted on the wheel hub and the cylindrical portion are made of a light alloy material such as aluminum alloy, the friction heat is effectively prevented from being transmitted to the bearing of the axle shaft. be able to. Moreover, since the connecting portion between the disc portion and the tubular portion can be effectively reinforced by the ribs, the rigidity of the disc rotor can be sufficiently secured without setting the plate thickness so large. There are advantages.

Further, a projecting piece is provided on one of the joining surfaces of the wheel hub or the disc rotor so that the end portion of the projecting piece abuts on the other side of the joining surface, and the disc rotor and the disc When the wheel hub is connected to the wheel hub, the contact surface contact can be reduced as compared with the case where the two are in contact with each other, so that the amount of heat transferred from the disk rotor to the wheel hub is more remarkable. It is possible to effectively prevent the bearings and the like provided on the wheel hub from being affected by heat.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing an embodiment of a vehicle brake device according to the present invention.

FIG. 2 is a cross-sectional view showing configurations of a disk rotor and a wheel hub.

FIG. 3 is a left side view of the disc rotor.

FIG. 4 is a right side view showing a state where the disc rotor is partially cut away.

[Explanation of symbols]

 6 Wheel Hub 7 Disc Rotor 8 Mounting Substrate 9 Cylindrical Part 10 Disc Part 11 Rib 12 Holding Part 16 Projecting Piece

Claims (3)

[Scope of utility model registration request] 1. A vehicle brake device having a disk rotor mounted on a wheel hub, wherein a mounting substrate fixed to the wheel hub, a tubular portion extending from the outer peripheral portion to the vehicle outer side, and an inner end portion to the outer peripheral portion. And a disc-shaped disc portion extending in a direction, and a plurality of ribs radially protruding from the outer peripheral surface of the tubular portion. 2. A disc rotor and a wheel hub are integrated with each other in the state where a projecting piece is provided on one of the joining surfaces of the wheel hub and the disk rotor, and the end surface of this projecting piece is in contact with the other of the joining surfaces. The brake device for a vehicle according to claim 1, wherein the brake device is connected to the vehicle. 3. The mounting substrate and the tubular portion of the disc rotor are formed of a light alloy casting material, and the tubular portion is provided with a holding portion for holding the base end portion of the disk portion. The vehicle brake device according to claim 1 or 2.