JPH0714669Y2 - Ventilated disk rotor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a ventilation type (ventilated type) disc rotor in a disc brake for a vehicle and a method for manufacturing the same.

[Prior Art] In this type of disc rotor, discs against which friction pads are pressed are hollow discs having a predetermined interval, and a large number of fins are radially provided in the hollow portion, and an air passage is formed by these fins. Has been done. This disk rotor has a large heat dissipation effect and excellent cooling performance because air flows by a centrifugal force through the ventilation passage whose cooling surface area is increased by fins.
The life of the pad can be extended.

However, since the hollow portion of the rotor having a complicated ventilation passage formed by the fins is integrally formed by casting, the disc rotor material needs to be castable and cannot be selected in terms of life. Further, even if an air passage having a small air resistance is to be formed, there is a certain limit due to the complexity of the core at the time of casting and the realization thereof is extremely difficult. Furthermore, it is difficult to avoid uneven thickness due to casting, and there are many rotating unbalanced masses, and it is necessary to pay particular attention to preventing vehicle vibration.

In order to solve this point, there has been proposed a ventilation type disk rotor in which a fin portion is provided with a heat radiating metal member such as a wire rod (actually developed 60-21040).

[Problems to be Solved by the Invention] However, the above-mentioned conventional ventilation type disk rotor is subject to wear due to rotation of the disk rotor, heat generation, or vibration damping.
The inserted heat-dissipating metal member may be separated from the fin portion.

An object of the present invention is to provide a ventilation type disk rotor which is lightweight, has excellent braking characteristics and cooling performance, and has high durability.

[Means for Solving the Problems] In order to achieve the above object, a ventilation type disk rotor of the present invention has a flange for mounting an axle at a base end, and a center thereof is aligned with an axis of the axle. An axle mounting portion having a tip, a ring fixed to the cylindrical body and provided with a plurality of air inflow holes around the ring, and fitted at a predetermined interval on the outer peripheral surface of the ring with the air inflow holes sandwiched therebetween. First and second grooves in which inner grooves are radially formed and each outer surface serves as a pad friction surface
A disk, and a large number of fins radially provided on the inner surface of either or both of the first and second disks,
An end face fixed to the groove, and a reinforcing plate for fixing the first and second discs at the predetermined interval, the air inflow hole, the first and second discs, the fins or the reinforcing plate. The ventilation passage is formed by.

[Operation] Air entering from the air inflow hole is blown out through the ventilation passage by the centrifugal force generated by the high speed rotation of the disk. The heat is dissipated from the fins and the reinforcing plate when the air passes through the ventilation passage, and the disk is efficiently cooled. In addition, the reinforcing plate reinforces both disks to improve durability.

[Embodiment] Next, an embodiment of the present invention will be described in detail with reference to the drawings.

As shown in FIGS. 1 to 5, the disc rotor 10 includes an axle mounting portion 15, a ring 19, a first disc 11, and a second disc 12.
And a large number of fins 13 and reinforcing plates 14.

The axle mounting portion 15 has a flange 16 at the base end for fixing to an axle (not shown). 16a is a bolt hole. A cylindrical body 17 whose center coincides with the axis of the axle is formed following the flange 16 on the axle mounting portion 15.

The end face of the ring 19 is fixed to the end face of the cylindrical body 17 by resistance welding, electron beam welding or laser welding W (fourth).
Figure). The center of the ring 19 coincides with the axis of the axle, and a plurality of air inflow holes 18 are provided around the ring 19 at equal intervals. The axle mounting portion 15 and the ring 19 are each made by casting.

The first disk 11 and the second disk 12 have the same outer diameter and are selected from materials having excellent heat resistance and wear resistance, such as nickel, chromium, and molybdenum steel, and each ring has a ring 19 at the center thereof. Mounting holes 11a and 12a having a hole diameter corresponding to the outer diameter are provided. Recessed grooves 11b and 12b facing each other are radially formed on the inner surfaces of the first disk 11 and the second disk 12, respectively. In this example, eight concave grooves 11b and 12b are formed linearly in the radial direction of each disk at equal intervals, and have a groove width corresponding to the thickness of a reinforcing plate 14 described later. The outer surface of each of the disks 11 and 12 serves as a friction surface of a pad (not shown).

The large number of fins 13 are selected from a material having good heat conductivity such as iron and aluminum, and in this example, the entire base end thereof is radially fixed to each inner surface of the disk 11 or 12 by welding W (FIG. 3). . An array of a large number of fins 13 is provided on the disks 11,1.
When the two are combined, the fins 13 of the disk 12 are provided so as to be located in the middle of the fins 13 of the disk 11 as shown in FIG.

A reinforcing plate 14 for fixing the disks 11 and 12 at a predetermined interval is inserted into the groove 11b of the first disk 11 and the groove 12b of the second disk 12. The reinforcing plate 14 is selected from materials having good heat conductivity such as iron and aluminum.

In order to manufacture a ventilation type disk rotor composed of such components, first, as shown in FIG.
Fins 13 are radially fixed to each inner surface of 12 by welding W. Then, the reinforcing plate 14 is inserted into the concave groove 11b of the disk 11 and the end surface thereof is fixed by welding. The fixed reinforcing plate 14 is inserted into the concave groove 12b of the other disk 12, and the other end faces are fixed similarly. As a result, the disks 11 and 12 are combined as shown in FIG.

Next, the combined disks 11 and 12 are fitted to the outer peripheral surface of the ring 19. The disks 11 and 12 are fixed to the ring 19 by welding W at positions sandwiching the air inflow hole 18.

Finally, the end surface of the cylinder body 17 of the axle mounting portion 15 is joined to the end surface of the ring 19 to which the disks 11 and 12 are fixed and fixed by welding W. As a result, an air passage 20 is formed by the air inflow hole 18, the disks 11 and 12, the fins 13 and the reinforcing plate 14 (FIGS. 1 and 5).

In addition to this method, both disks 11 and 12 are attached to the reinforcing plate 1.
It is also possible to interpose 4 between them and temporarily assemble them in a sandwich form, fix them with clamps, and further fit the ring 19 and fix each part with clamps, and then weld the portions indicated by W in FIG.

When the disc rotor 10 thus completed is attached to an axle and used for a disc brake, an air inlet hole
The air entering from 18 is blown out through the ventilation passage 20 by the centrifugal force generated by the high speed rotation of the disks 11 and 12. As a result, the friction heat generated on the disks 11 and 12 due to the pressure contact of the pads is dissipated from the fins 13 and the reinforcing plate 14 when the air passes through the ventilation passage 20, and the disks 11 and 12 can be cooled. Since the reinforcing plate 14 firmly couples both the disks 11 and 12, the disk rotor 10 has high durability.

As shown in FIG. 6, one or both of the reinforcing plates 14 of the disks 11 and 12 are formed by forging or casting of the disk itself, and a concave groove is provided on the inner surface of the disk facing the plate 14, and the tip of the plate 14 is formed. The surface may be welded to the groove. This results in a more robust disc rotor.

Further, an array of a large number of fins 13 may be provided so as to abut against the fins 13 of the disks 11 and 12, respectively, as shown in FIG. The butted portion may be further welded and fixed.

Further, the fins of either one or both of the disks 11 and 12 may be formed by forging or casting of the disk itself instead of welding. When fins are formed on one disk by forging or casting, it is preferable to form fins on the other disk by welding in terms of heat dissipation.

Further, the fins, the reinforcing plate and the concave groove are formed linearly in the radial direction of the disk, but in order to enhance the heat radiation effect, they are formed in a curved shape so that the air flow through the ventilation passage becomes a swirl flow. You may.

[Effects of the Invention] As described above, according to the present invention, a hollow disk is conventionally produced by casting, and according to the present invention, a built-up method is adopted and a large number of fins are attached to each of the first and second disks. Since these parts are integrated after or after being integrally processed, (a) these disks can be made of a disk rotor material having a long life which is excellent in heat resistance and wear resistance regardless of castability. , (B) Since both discs are joined by the reinforcing plate, the disc rotor becomes more robust and has high durability. (C) In addition to the fins, the reinforcing plate for reinforcing the coupling of both discs has good thermal conductivity. Also, it can be made from a material with excellent heat dissipation, and it is possible to create a durable disk rotor with good cooling efficiency and long life. (D) Also consider castability Since the fins can be formed without using the fins, the structure of the fins, the mounting structure, the size and the number of the fins can be made to be a structure in which the airflow can easily flow, and the heat dissipation can be improved. e) Since the first and second disks can be processed with high accuracy, the rotation balance after integral molding is very good. Since the disk rotor does not exist, there is no fear that the heat radiation member will be separated from the disk due to rotation of the disk rotor or heat generation.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of a ventilation type disk rotor according to an embodiment of the present invention. FIG. 2 is a perspective view of the ventilation type disk rotor. FIG. 3 is a perspective view of an essential part of the disk showing a state where the reinforcing plate is mounted after the fins are fixed to the inner surface of the disk by welding. FIG. 4 is a central longitudinal sectional view of the ventilation type disk rotor. FIG. 5 is a cross-sectional view of essential parts showing the state in which the fins and the reinforcing plate are fixed to the disk as viewed from the radial direction. FIG. 6 is a view corresponding to FIG. 3 showing another embodiment and is a perspective view of a main part in which a reinforcing plate is formed by forging or casting of the disc itself. FIG. 7 is a view corresponding to FIG. 5 showing another embodiment. 10: Disc rotor, 11: First disc, 12: Second disc, 13: Fin, 14: Reinforcement plate, 15: Axle mounting part, 16:
Flange, 18: Air inlet hole, 19: Ring, 20: Ventilation passage.

Claims (1)

[Scope of utility model registration request] 1. An axle mounting portion having a flange for attaching an axle at a base end, and a tip having a tubular body whose center coincides with an axis of the axle, and a plurality of airs fixedly attached to the tubular body. A ring provided with an inflow hole, and fitted at a predetermined interval on the outer peripheral surface of the ring with the air inflow hole interposed therebetween, concave grooves are radially formed on the inner surface, and each outer surface serves as a pad friction surface. And a second disc, a large number of fins radially provided on the inner surface of either or both of the first and second discs, and an end face fixed to the concave groove, and the first and second discs A ventilation type disk rotor comprising: a reinforcing plate fixed at a predetermined interval; and an air passage formed by the air inflow hole, the first and second disks and the fins or the reinforcing plate.