JPH0723734B2 - Ventilated disk rotor and method of manufacturing the same - Google Patents

Description

TECHNICAL FIELD 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 shoji 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, heat generation or vibration damping of the disk rotor.
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 good durability.

Another object of the present invention is to adopt a built-up method to freely select a material suitable for conduction and heat dissipation of friction heat, and to provide a degree of freedom in design according to the purpose of conduction and heat dissipation of friction heat. An object of the present invention is to provide a method for manufacturing a ventilation type disk rotor which can be greatly improved as compared with the conventional method.

[Means for Solving the Problems] In order to achieve the above-mentioned object, a ventilation type disk rotor of the present invention has a flange at its base end for fixing to an axle.
Axle mounting portion having an inner ring at the tip, the center of which coincides with the axle and is provided with a plurality of air inflow holes in the periphery, and the outer ring of the inner ring, which is fitted at a predetermined interval with the air inflow holes interposed therebetween. , First and second disks each having an outer surface serving as a pad friction surface, and radially provided on the inner surface of one or both of the first and second disks, the air inflow hole and the first and second disks And a plurality of fins that form an air passage, and an outer ring that fixes the first and second disks at the predetermined interval and that is provided with a plurality of air outlets that communicate with the air passage. is there.

Further, in the method for manufacturing a ventilation type disk rotor of the present invention, a large number of fins are radially provided on the inner surface of either or both of the first and second disks, each outer surface of which serves as a pad friction surface.
On the outer peripheral surface of the inner ring of the axle mounting part having a flange for fixing to the axle at the base end, the center of which is the same as the axle and the inner ring having a plurality of air inflow holes provided at the periphery is at the tip, The first and second discs are fitted at a predetermined interval with the air inflow hole interposed therebetween to form an air passage by the air inflow hole, the first and second discs, and the fins. An outer ring having a large number of air outlets communicating with the air passage is fitted to the outer peripheral surfaces of the first and second discs so as to cover the space between the two discs, and the first and the second rings with respect to the inner ring are fitted. This is a method of welding and fixing the fitting portion of the second disk and the fitting portion of the outer ring to the first and second disks, respectively.

Further, according to another manufacturing method of the present invention, the first disc is fitted to the outer peripheral surface of the inner ring, and the outer ring having a plurality of air blowout holes is welded and fixed to the peripheral edge of the first disc. After that, a second disk is fitted to the outer peripheral surface of the inner ring with the air inflow hole of the inner ring interposed therebetween, and air is ventilated by the air inflow hole, the first and second disks, the fins, and the air blowout hole. Forming a passage, and then fitting the first and second discs to the inner ring and the second
In this method, the peripheral edge of the disk is welded and fixed to the outer ring.

[Operation] The air entering from the air inflow hole is blown out from the air blowout hole through the ventilation passage by the centrifugal force generated by the high speed rotation of the disk. The heat is dissipated from the fins as the air passes through the air passage, and the disk is cooled efficiently.

In order to make many fins separately from the disc and integrate them,
The disk material has a life expectancy, and the fin material can form the disk rotor with emphasis on heat dissipation, and the fin shape, mounting structure, size, and quantity can be made a structure in which an airflow can easily flow.

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

As shown in FIGS. 1 and 2, the disc rotor 10 includes an axle mounting portion 15, a first disc 11, a second disc 12, a plurality of fins 13 and an outer ring 14.

(A) Axle mounting portion: 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 body portion 17 is formed on the axle mounting portion 15 following the flange 16, and an inner ring having a plurality of air inflow holes 18 at equal intervals around the center of the body portion 17 at the tip end of the body portion 17 is provided. 19 is formed. The flange 16, the body portion 17 and the inner ring 19 are made by casting.

(B) Disc: The first disc 11 and the second disc 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 has a center. Is mounting holes 11a and 12a having a hole diameter corresponding to the outer diameter of the inner ring 19.
A plurality of through holes 11b and 12b for inserting rivets are provided at equal intervals around each of the mounting holes 11a and 12a. The outer surface of each of the first disk 11 and the second disk 12 serves as a friction surface of a pad (not shown).

(C) Fins: A large number of fins 13 are selected from a material having good heat conductivity such as iron, aluminum, etc., and as shown in FIG. 3, the entire base end surface is the inner surface of either or both of the disk 11 and the disk 12. It is fixed radially by resistance welding R.

Further, the fin 13 has a substantially U-shaped cross section (FIGS. 4 and 5) or a substantially L-shape (6th cross section) perpendicular to the direction A in which the airflow flows.
FIG. 7 and FIG. 7) to form a disk 11 at the bottom of the fin or
The area of contact with 12 may be increased so that they can be fixed by laser welding or electron beam welding L. By making the cross section substantially U-shaped, the heat dissipation area is increased and the cooling performance is further improved.

Especially in this case, as shown in FIG. 8 and FIG.
Plural incisions perpendicular to the direction A of the air flow at the edges of
By providing a and bending or bending the edges alternately in opposite directions at the base end of the cut, the cooling performance is further enhanced.

The fin 13 of the present invention may be formed on either or both of the disks 11 and 12 by forging or casting as shown in FIG. When the fin 13 is formed on one disk by forging or casting, it is preferable from the viewpoint of heat dissipation that the fin 13 is formed on the other disk by welding.

As shown in FIG. 11, an array of a large number of fins 13 is provided with radial fins 13 on the inner surface of the first disk 11 and radial fins on the inner surface of the second disk 12 so as to be located between the fins 13. It is preferable to provide 23 in terms of heat dissipation,
As shown in FIG. 12, a large number of fins 13 are provided radially on the inner surface of the first disk 11, and the fins 13 are abutted on the respective fins 13 and radially arranged on the inner surface of the second disk 12.
It is also possible to provide.

Further, in order to increase the strength when the pad is rubbed, it can be assembled by the following various methods.

As shown in FIG. 13, after the entire base end surfaces of the fins 13 and 23 are welded to the inner surfaces of the disks 11 and 12, respectively, the tips of the fins 13 and 23 are brought into contact with the inner surfaces of the opposed disks 12 and 11, respectively. .

As shown in FIG. 14, after the entire base end surfaces of the fins 13 and 23 are welded to the inner surfaces of the disks 11 and 12, respectively, the tips of the fins 13 and 23 are butted to each other and connected.

As shown in FIG. 15, the tips of the abutted fins 13 and 23 are further welded to each other.

As shown in FIG. 16, the tips of the connected fins 13 and 23 are further welded to each other.

As shown in FIG. 17, after fins 13 and 23 are formed on disks 11 and 12 by forging or casting, the tips of fins 13 and 23 are brought into contact with the inner surfaces of opposed disks 12 and 11, respectively.

As shown in FIG. 18, after fins 13 and 23 are formed on the disks 11 and 12 by forging or casting, the tips of the fins 13 and 23 are connected to each other by butting.

As shown in FIG. 19, the tips of the abutted fins 13 and 23 are further welded to each other.

As shown in FIG. 20, the fins 13 are formed on the disk 11 by forging or casting, the fins 23 are fixed to the disk 12 by welding, and then the tips of both fins 13 and 23 are butted against each other and welded. Stick to it.

Further, as shown in FIG. 21 and FIG. 22, the air flow that has flown into the air inflow hole 18 becomes a swirl flow and an air blowout hole 21 to be described later.
By arranging a large number of fins 13 so as to blow out from above, the amount of air passing through the inside of the disk rotor per unit time can be increased.

(D) Outer ring: Returning to FIGS. 1 and 2, the outer ring 14 has an inner diameter corresponding to the outer diameters of the disks 11 and 12, and a width that covers the space between the disks 11 and 12, and surrounds it. Are provided with the same number of air outlets 21 as the air inlets 18 at equal intervals.

In order to manufacture a ventilation type disk rotor made of such components, first, the disks 11 and 12 each having a large number of fins radially provided on each inner surface are fitted to the outer peripheral surface of the inner ring 19 of the axle mounting portion 15. . In this fitting, the inner surfaces of the disks 11 and 12 are opposed to each other, and the air inflow hole 18 is sandwiched between the through holes 11 and 12.
Insert reinforcing rivets 22 into b and 12b
And 12 are arranged at a predetermined interval. As a result, the air inlets 18, the disks 11 and 12, and the fins 13 allow the ventilation passage 20 to pass through.
Are formed (FIGS. 11 and 12).

Then, an outer ring 14 is fitted to the outer peripheral surfaces of both disks 11 and 12 so as to cover the space between both disks 11 and 12, and a large number of air blow holes 21 are communicated with the air passage 20.

Finally, both ends of the rivet 22 are caulked, and the fitting positions of both discs 11 and 12 to the inner ring 19 and both discs 11 and 12 are
The fitting portions of the outer ring 14 with respect to are welded and fixed by electron beams or the like. If necessary, finishing processing may be performed to complete the ventilation type disk rotor 10 of the present invention.

Incidentally, as shown in FIG. 23, the outer diameter of the outer ring 14 may be formed so as to correspond to the outer diameter of the disks 11 and 12. In this case, the first disk 11 is fitted to the outer peripheral surface of the inner ring 19, the outer ring 14 is welded and fixed to the peripheral edge of the first disk 11, and then the second disk 12 is attached to the outer peripheral surface of the inner ring 19. Then, the second disk 12 is fixed to the outer ring 14 by welding the peripheral edge thereof.

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 from the air blowing hole 21 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 frictional heat generated on the disks 11 and 12 due to the pressure contact of the pads is dissipated from the fins 13 when the air passes through the ventilation passage 20, and the disks 11 and 12 can be cooled.

[Effects of the Invention] As described above, according to the present invention, a hollow disc is conventionally produced by casting, and a built-up system is adopted to attach a large number of fins to the first and second discs, respectively. 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) Moreover, the fins can be made of a material having good thermal conductivity and excellent heat dissipation, so that a durable disk rotor with a long life can be produced. (C) Also consider the castability. Since the fins can be formed without using the fins, the shape, mounting structure, dimensions and quantity of the fins can be changed to a structure in which the airflow can easily flow to improve heat dissipation, and the advantages of light weight and higher cooling performance can be achieved. Yes, (d) the first and second disks can be machined with high precision, so the rotational balance after integral molding is very good, and (e) unlike conventional ventilation disk rotors, heat dissipation metal members such as wire rods. Since the disk is not inserted, there is no fear that the heat dissipation member will come off 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 a disc in which fins are fixed to the inner surface of the disc by welding. FIG. 4 and FIG. 6 are perspective views of a main part of a disc in which fins of another shape are fixed to the inner surface of the disc by welding. 5 and 7 are cross-sectional views perpendicular to the air flow direction A of the fins of FIGS. 4 and 6, respectively. FIG. 8 and FIG. 9 are perspective views of fins processed by forming cuts in the edges of the fins having the shapes shown in FIGS. 4 and 6, respectively. FIG. 10 is a perspective view of a main part of a disc in which fins are formed on the inner surface of the disc by forging. 11 to 20 are cross-sectional views of essential parts showing various arrangements of fins as viewed from the radial direction and the state of attachment to the disc. FIG. 21 is a disk front view showing the arrangement of fins as viewed from the axial direction. FIG. 22 is a front view of a disk showing another arrangement of fins as viewed in the axial direction. FIG. 23 is a perspective view of an essential part of a ventilation type disk rotor according to another embodiment of the present invention. 10: Disc rotor, 11: First disc, 12: Second disc, 13,23: Fin, 14: Outer ring, 15: Axle mounting part, 16:
Flange, 18: Air inlet hole, 19: Inner ring, 20: Ventilation passage, 2
1: Air outlet.

Claims (14)

[Claims] 1. A ventilation type disk rotor having a flange for fixing to an axle at a base end, which comprises an inner ring and an outer ring whose centers coincide with the axle, and whose outer surfaces are pad friction surfaces, respectively. A ventilated disk rotor characterized in that a second disk is fixed to the inner ring and the outer ring with a space therebetween. 2. An axle mounting portion having a flange for fixing to an axle at a base end, an inner ring having a center coinciding with the axle and a plurality of air inflow holes provided in the periphery at a tip, and an inner ring. First and second discs fitted to the outer peripheral surface of the ring at a predetermined interval with the air inflow hole sandwiched therebetween, each outer surface serving as a pad friction surface, and either one or both of the first and second discs. A plurality of fins that are provided radially on the inner surface and that form an air passage together with the air inflow holes, the first and second disks, and the first and second disks are fixed at the predetermined interval,
An air-circulating disc rotor, comprising: an outer ring having a plurality of air outlets communicating with the air passage. 3. A ventilation type disk rotor according to claim 2, wherein a large number of fins provided on either or both of the first and second disks are fixed to said disk by welding. 4. A ventilation type disk rotor according to claim 3, wherein the first and second disks are formed of a heat resistant and wear resistant material, and the fins are formed of a heat conductive material. 5. A ventilation type disc rotor according to claim 2, wherein a large number of fins provided on either or both of the first and second discs are formed on the disc by forging or casting. 6. The ventilation mold according to claim 2, wherein a large number of fins provided on one disk are fixed to the disk by welding, and a large number of fins provided on the other disk are formed on the disk by forging or casting. Disk rotor. 7. The fin is processed to improve heat dissipation or to allow the air flow to flow with low air resistance.
Ventilated disk rotor described. 8. A ventilation type disk rotor according to claim 2, wherein a large number of fins are arranged so that the air flow flowing into the air inflow hole becomes a swirl flow and blows out from the air blowout hole. 9. The fin according to claim 2, wherein a large number of fins are provided radially on the inner surface of the first disk, and a large number of fins are provided radially on the inner surface of the second disk so as to be located between the fins. Ventilated disk rotor. 10. The ventilation type disk rotor according to claim 9, wherein the tips of the fins of the first and second disks are in contact with or fixed to the inner surfaces of the disks facing each other. 11. A ventilation type according to claim 2, wherein a large number of fins are radially provided on the inner surface of the first disk, and a large number of fins are radially provided on the inner surface of the second disk by abutting these fins. Disk rotor. 12. An inner ring, the center of which is aligned with the axle, is provided at the tip of a flange for fixing to the axle, and first and second discs having outer surfaces serving as brake pad friction surfaces are provided with the inner ring and the center, respectively. A method of manufacturing a ventilated disk rotor that is fixed to each other with an outer ring that conforms to the axle and is spaced from each other. 13. A large number of fins are radially provided on the inner surface of either or both of the first and second discs, each outer surface of which serves as a pad friction surface, and has a flange at the base end for fixing to the axle. On the outer peripheral surface of the inner ring of the axle mounting portion having the inner ring around the center of which the inner ring has a plurality of air inflow holes provided at the periphery, the first ring is provided at predetermined intervals with the air inflow hole interposed therebetween. And a second disc are fitted to form an air passage by the air inflow hole, the first and second discs, and the fins, and the first and second discs are covered so as to cover the space between the first and second discs.
And an outer ring provided with a plurality of air outlets communicating with the ventilation passage on the outer peripheral surface of the second disc, and a fitting portion of the first and second discs with respect to the inner ring and the first ring. And a method for manufacturing a ventilation type disk rotor, in which the fitting portions of the outer ring to the second disk are welded and fixed. 14. A large number of fins are radially provided on the inner surface of one or both of the first and second discs, each outer surface of which serves as a pad friction surface, and has a flange at the base end for fixing to the axle. The first disk is fitted to the outer peripheral surface of the inner ring of the axle mounting portion having the inner ring around the center of which the inner ring is provided with a plurality of air inflow holes around the center, and a plurality of air outlet holes are formed. The provided outer ring is welded and fixed to the peripheral edge of the first disc, and then the second disc is fitted to the outer peripheral surface of the inner ring with the air inflow hole of the inner ring sandwiched between the outer ring and the outer ring. The first
An air passage is formed by the second disk, the fins, and the air outlet holes, and then the fitting portion of the first and second disks to the inner ring and the peripheral edge of the second disk are welded to the outer ring. A method of manufacturing a fixed ventilation disk rotor.