JPS623547Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a disc brake device for a vehicle.

A disc brake device that exhibits stable braking characteristics while preventing wheels from locking during braking is generally constructed as shown in FIG.

The wheel-side disc rotor 1 is fastened to the inside of the flange 4 of the hub 3 together with the outside disc wheel 5 by hub bolts 6. The hub 3 is rotatably supported by a steering knuckle 8 of a front axle 7 via an inner bearing 9 and an outer bearing 10. Brake cylinder 2 that brakes the disc rotor 1
is fixed to a part of the steering nutcle 8,
A disc 13 of a disc rotor 1 is clamped from both sides by a brake pad 12 connected to a piston 11 that responds to brake pressure oil, so that even during sudden braking, braking can be performed reliably while preventing locking.

By the way, a large number of radial grooves 14 are formed inside the disk 13, and as the disk rotor 1 rotates, the radial grooves 14 become a kind of centrifugal fan 15.
The air between the inner periphery of the disc rotor 1 and the outer periphery of the hub 3 is sucked in as shown by the arrow and discharged in the centrifugal direction, and the braking heat generated during braking is cooled to the disc 13. This is designed to prevent seizure between the brake pad 12 and the brake pad 12. However, since the gap between the hub 3 and the disc rotor 1 is closed by the connection between the two, and the radial groove 14 is located on the opening side of the disc rotor 1, the disc rotor 1 The heat accumulated in the hub 3 is conducted to the hub 3, and the grease 16 stored inside becomes overheated and deteriorated.

As described above, the disk rotor 1 is fastened together with the disk wheel 5 to both sides of the flange 4 of the hub 3 by the hub bolts 6. Therefore, the installation work is performed by inserting the hub bolts 6 from the outside into the mounting holes 17 of the flange 4, and then inserting the end protruding inward into the mounting holes 18 of the disk rotor 1.
The threaded portion is tightened with a nut 19, the flange 20 of the hub bolt 6 is engaged with the step portion of the mounting hole 17 to fix the disk rotor 1, and then the outer end of the hub bolt 6 is inserted into the mounting hole 21 of the disk wheel 5 and the disk wheel 5 is tightened and fixed with a wheel nut 22.

Therefore, during this work, the nut 19 is tightened in the narrow gap between the flange 4 and the disc rotor 1, making it particularly difficult to tighten, and it is impossible to use a power tool such as an impact wrench, resulting in extremely poor workability. .

The present invention is intended to solve the above-mentioned problems, and it provides a means to cool the attachment part of the disk rotor to the hub, and also allows the attachment of the disk rotor to be tightened from the outside of the hub flange using a special mounting bolt. It is an object of the present invention to provide a disc brake device for a vehicle that improves braking heat cooling performance and disc rotor installation work.

Embodiments will be described below based on the drawings. In FIGS. 2 and 3, the same or equivalent parts as in FIG. 1 will be described with the same reference numerals.

As shown in FIG. 2, the disk rotor 1 includes a disk 13 at one end of a cylindrical housing 23
However, a flange 24 is formed at the other end. A plurality of bosses 25 are protruded from the side surface of the flange 24 on the same circumference at a pitch equal to the pitch of the mounting holes 21 of the disk wheel 5, and radial gaps are formed between the bosses 25.

The boss 25 connects the inner peripheral end surface to the disk rotor 1.
A stepped portion 26 is provided concentrically with the axis of the hub, and this stepped portion 26 is formed to engage with a stepped portion 27 provided around the flange 4 of the hub 3, as shown in FIG. . The boss 25 also has a mounting hole 1 in its center.
8 is bored, and the mounting hole 18 forms a straight portion 28 which is slightly reamed on the flange 4 side of the hub 3, and a threaded portion 29.

A rotor attachment hole 30 is bored in the flange 4 of the hub 3 at a position corresponding to the attachment hole 18 of the disc rotor 1, and a countersunk seat 31 is formed on the outside of the flange 4 of the attachment hole 30.

A rotor mounting bolt 32 is inserted into the rotor mounting hole 30 from the outside of the flange 4, and its head 33 is formed so as to be buried in the countersunk seat 31. At the end, there is a threaded part 3 following a slight shaft part 34.
5 is formed.

Further, the flange 4 of the hub 3 has a wheel mounting hole 3 corresponding to the mounting hole 21 of the disc wheel 5 so as to be located in the middle of the rotor mounting hole 30.
A hub bolt 6 is inserted into the wheel mounting hole 36 from the inside of the flange 4 .

The head portion 37 of the hub bolt 6 is formed with a beveled end surface 38, and the end surface 38 is adapted to be engaged with the stepped portion 27 of the flange 4.

Next, the effect will be explained.

To attach this disc rotor 1 to the flange 4 of the hub 3, first insert the hub bolt 6 into the wheel mounting hole 36 of the flange 4 from the inside of the flange 4.
is inserted, its end surface 38 is engaged with the stepped portion 27, and if necessary, the wheel nut 22 is screwed onto the end portion for temporary fixation. Next, the step portion 26 of the boss 25 of the disc rotor 1 is fitted into the step portion 27 of the flange 4,
Insert the rotor mounting bolt 32 into the rotor mounting hole 30 from the outside of the flange 4, and then tighten the threaded portion 35.
Then, tighten the threaded portion 29 of the boss 25 attachment hole 18 to fix the disk rotor 1.

At this time, the head 33 of the rotor mounting bolt 32
Since it is located on the outside of the flange 4, a power tool such as an impact wrench can be used, so the installation work is extremely easy and the work time is greatly shortened compared to the conventional method.

In addition, since the shaft portion 34 of the rotor mounting bolt 32 engages with the straight portion 28 of the mounting hole 18 of the boss 25, it may be damaged by the shearing hose applied to the rotor mounting bolt 32 during braking, or the threaded portion 35 may be damaged. damage is prevented.

Next, the mounting hole 21 of the disc wheel 5 is inserted into the hub bolt 6 which has been inserted into the flange 4 wheel mounting hole 36 of the hub 3 in advance, and the disc wheel 5 is fixed by tightening with the wheel nut 22. At this time, the head 33 of the rotor mounting bolt 32 is buried in the countersunk seat 31 of the rotor mounting hole 30, so that it does not interfere with the disc wheel 5.

On the other hand, when the disc rotor 1 and the disc wheel 5 are attached to the flange 4 of the hub 3 in this way, the head 37 of the hub bolt 6 is inserted between the bosses 25 of the disc rotor 1, as shown in FIG. 2a. radial gap S between the boss 25 and the boss 25.
is formed. Therefore, when the disc rotor 1 rotates together with the hub 3, they operate like a kind of centrifugal fan, and as shown in FIG. It is discharged to the outside from the gap S in the centrifugal direction through the opening 39 of the disc wheel 5 as shown in FIG.

As a result, the air between the disc rotor 1 and the hub 3 is removed from the radial grooves 14 of the disc rotor 1 described above.
The braking heat generated in the disc rotor 1 is discharged without stagnation from the radial gap S, thereby sufficiently improving the cooling effect of the braking heat generated in the disc rotor 1. Therefore, not only overheating of the brake pad 12 but also overheating of the grease 16 sealed in the bearing portion can be effectively prevented.

As explained above, according to the present invention, a centrifugal fan is formed at the attachment part of the disc rotor to the hub by the gap formed between the boss protruding from the disc rotor and the head of the hub bolt. Since the disc rotor can be tightened from the outside of the hub flange using a special mounting bolt,
This has the effect of greatly improving the ability to cool braking heat to prevent brake seizure and hub grease deterioration, while also improving workability in installing the disc rotor and greatly reducing work time.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing how a conventional disc brake device is installed on an axle device, Fig. 2 shows a disc rotor according to an embodiment of the present invention, and Fig. a is a front view seen from the outside; FIG. 3B is a cross-sectional view taken along the line A--A in FIG. 1... Disc rotor, 2... Brake cylinder, 3... Hub, 4... Hub flange, 5...
Disc wheel, 6...Hub bolt, 8...Steering nut, 11...Piston, 12...
...Brake pad, 13...Disc, 14...
radial hole, 15... fin, 17... hub mounting hole, 18... rotor mounting hole, 19... nut inside hub bolt, 20... flange of hub bolt,
21...Wheel mounting hole, 22...Wheel nut, 23...Disc rotor housing, 24
... Disc rotor flange, 25 ... Boss,
26...Step part of boss, 27...Step part of hub flange, 28...Straight part of rotor mounting hole, 30
...Rotor mounting hole, 32...Rotor mounting bolt,
34... Shaft of rotor mounting bolt, 36... Wheel mounting hole, 37... Head of hub bolt, 38...
...Hub bolt head end face, 39...Disk wheel opening.

Claims (1)

[Scope of utility model registration request] The disc wheel is fixed via a hub holder to the outside of the hub flange that supports the wheel, and the disc rotor is fixed to the inside of the flange.
Brake pads are arranged on both sides of the disc of the disc rotor and interlock with brake cylinders attached to the vehicle body, and a large number of radial holes are formed inside the disc to prevent air between the inner periphery of the disc rotor and the outer periphery of the hub. In a disc brake device for a vehicle that is capable of discharging water in a centrifugal direction, a plurality of bosses are provided protruding at approximately equal intervals on the circumference of the joint surface of the hub side flange of the disc rotor, and the hub flange is inserted from the outside. At the same time, the disc wheel is connected to the hub flange via the hub bolt at the intermediate position between each of the adjacent boss parts, and a screw is inserted between the head of the hub bolt and the boss part. A disc brake device for a vehicle, characterized in that air between an inner periphery of a disc rotor and an outer periphery of a hub can be discharged in a centrifugal direction through the formed gap.