JPH0318752Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a disc brake used in an automobile, and particularly to a balance weight for a disc rotor of the disc brake.

(Prior Art) An automobile disc brake has a pair of pads arranged on both sides of a disc rotor, and these pads are pressed against the disc rotor by a hydraulic cylinder installed in the caliper. It is designed to brake the rotation of the disc rotor, and therefore, during braking, frictional heat is generated due to the friction. Since the pad is made of a material that is difficult to conduct heat, such as asbestos, this heat is transmitted to the disc rotor, which is made of a material with good thermal conductivity such as steel, and is further radiated from the disc rotor's circumferential surface. The signal is transmitted to a caliper installed astride the disc rotor. As a result, the caliper is heated, the temperature of the brake fluid increases, paper lock is more likely to occur, and brake performance is degraded.

For this reason, as disclosed in Japanese Utility Model Application No. 55-3073, the flange portion of the disc rotor to which the pads are pressed is formed thick, and at the center of the thickness of the flange portion, a radial A configuration is adopted in which a plurality of penetrating ventilation holes are arranged in parallel in the circumferential direction and the disc rotor is cooled by air passing through these ventilation holes as the disc rotor rotates.

On the other hand, in a disc rotor, if there is a weight imbalance in the disc rotor, vibrations occur due to the action of centrifugal force due to the rotation of the disc rotor. Since centrifugal force is proportional to the square of the rotational speed of the disc rotor, this vibration becomes a problem especially when traveling at high speeds.

Conventionally, in the case of a disc rotor having the ventilation holes, in order to correct this imbalance, a substantially U-shaped balance weight is attached to the partition wall between the ventilation holes from the inner circumferential direction of the ventilation holes of the disc rotor. It was inserted and assembled. However, for example, in the case where the disc rotor and the wheel hub to which the disc rotor is attached are integrally formed, there is a problem in that it is difficult to assemble the balance weight from the inner circumferential direction of the disc rotor. Therefore, it may be possible to assemble the balance weight by inserting it from the outer circumferential direction, but in this case,
Since centrifugal force acts in the direction in which the balance weight comes off, it is necessary to securely hold it in place. Until now, there has been no known balance weight that fully satisfies both the functions of fixation and one-touch assembly.

(Purpose of the invention) The present invention has been devised in view of the above-mentioned conventional problems, and has a simple structure and is applied to the disc rotor of an automobile disc brake having the cooling ventilation holes described above, for example, due to the structural problems of the disc brake. To provide a balance weight that can be easily and firmly attached from the outer circumferential direction of the disk rotor to balance the disk rotor even when the disk rotor is difficult to assemble from the inner circumferential direction. With the goal.

(Structure of the invention) The present invention has a balance weight formed in a substantially U-shape, and a pair of locking parts extending bent outward at both ends in the opening direction, and a folded part approximately in the center of both arms. The balance weight is configured such that both arms are bent in the front-rear direction, and the length in the front-rear direction is larger than the width of the cooling ventilation hole in the axial direction of the disk rotor. When this balance weight is inserted from the outer circumferential direction of the disc rotor into adjacent cooling ventilation holes, the pair of locking portions are resiliently locked to the inner peripheral ends of the cooling ventilation holes, and the bent portions are is in pressure contact with a partition wall between two adjacent cooling ventilation holes, and the bent portions of both arms are mounted in pressure contact with the front and rear walls of the cooling ventilation holes.

(Effects of the invention) Since the present invention is constructed as described above, it can be easily assembled by simply inserting the balance weight from the outer circumferential direction of the disk rotor, and the balance weight can be easily assembled by inserting the balance weight from the inner circumference of the cooling ventilation hole. It is firmly assembled to the disk rotor by being resiliently supported by the end portions, the partition walls of both cooling ventilation holes, and the front and rear walls of the cooling ventilation holes. This has the effect that the disc rotor can be balanced and vibrations can be reduced.

(Example) An example of the present invention will be described based on the drawings. 1st
In the drawings and FIG. 2, reference numeral 1 designates a caliper which has a built-in hydraulic cylinder (not shown) and which presses a pair of pads 2, 2 arranged opposite to each other against a disc rotor 3. The disc rotor 3 is the wheel hub 4
It has a hat-shaped shape integrally molded with the wheel, and is also supported by the axle 6 via a bearing 5.
A flange portion 3a serving as an annular sliding portion against which the pad 2 of the disc rotor 3 is pressed is a stepped portion 3b.
The wall thickness in the axle direction is larger than that of the
As shown in a partially sectional view in FIG. 2, the flange portion 3a
The flange portion 3 extends in the half mold direction from the outer peripheral portion of the
A plurality of cooling ventilation holes 3c are arranged in parallel in the circumferential direction of the disk rotor 3 so as to penetrate through the hole 3a and communicate with the hollow portion 7. The balance weight 8, which is assembled to the disc rotor 3 and balances the disc rotor 3, is made by bending a wire-like steel material into a substantially U-shape, as shown in FIG.
At the upper center of the arm portions 8b, 8b of the balance weight 8, there is a bent portion 8 that is folded back so that the arms 8b, 8b are close to each other.
a, 8a are formed, and the interval between both bent portions is set smaller than the width of the partition wall 3d between the cooling ventilation holes 3c. A pair of locking portions 8d, 8d which extend outward from the bent portions 8a, 8a toward the opening portion 8c and extend outwardly are provided at both opening ends. In addition, the balance weight 8 has two points in the front-rear direction, namely, the bent portions 8a, 8a and the lower center of the arm portions 8b, 8b of the balance weight 8, which are larger than the distance between the cooling ventilation holes 3c in the axial direction of the disc rotor 3. It is bent.

An assembly procedure for assembling the balance weight 8 having such a shape at an appropriate position to correct the imbalance of the disc rotor 3 will be described below.
From the outer circumferential direction of the disc rotor 3, the opening 8c of the balance weight 8 is directed toward the axle 6, and the balance weight 8 is inserted into the adjacent cooling ventilation hole 3c.
Insert the locking portions 8d and 8d separately.
Then, the bottom part 8e of the balance weight 8 is brought into contact with the outer peripheral end of the partition wall 3d of the cooling ventilation hole 3c, and the locking parts 8d, 8d of the balance weight 8 are pushed into the inner peripheral end of the partition wall adjacent to the partition wall 3d. Lock and assemble.

As described above, the balance weight 8 is assembled to the disc rotor 3, so that it is resiliently supported firmly in the cooling ventilation hole 3c in the circumferential direction, axial direction, and radial direction of the disc rotor 3, and the disc The rotor 3 can be balanced and vibrations can be reduced.

[Brief explanation of the drawing]

FIG. 1 is a schematic plan sectional view of an automobile disc brake showing an embodiment of the present invention, FIG. 2 is a schematic side view showing the side structure, and FIG. 3 is a perspective view of a balance weight. 2, 2...pad, 3...disc rotor, 3
c... Cooling ventilation hole, 3d... Partition wall, 8a, 8a
...Bending part, 8b, 8b... Arm part, 8d, 8d...
...Latching part.

Claims (1)

[Scope of utility model registration request] In a disc brake for an automobile, a plurality of cooling ventilation holes extending approximately radially in an annular sliding portion of a disc rotor to which a pair of opposing pads are pressed are arranged in parallel in the circumferential direction of the disc rotor. It has a U-shape, and has a pair of locking parts bent and extending outward at both ends in the opening direction, and a bent part formed by folding back approximately the center of both arms, and further, both arms are bent in the front-rear direction. The balance weight is formed such that its longitudinal dimension is larger than the width of the cooling ventilation hole in the axial direction of the disc rotor, and both arms of the balance weight extend in the outer circumferential direction of the disc rotor. are respectively inserted into the adjacent cooling ventilation holes, and the pair of locking portions are resiliently locked to the inner circumferential ends of the cooling ventilation holes, and the bent portions are inserted into the adjacent cooling ventilation holes. An automobile characterized in that the bent portions of the arms, which are pressed against a partition wall between the ventilation holes and inserted into each cooling ventilation hole, are mounted so as to be pressed against the front and rear walls of the cooling ventilation holes. Balance weight for disc brakes.