JPS6322350Y2 - - Google Patents

Description

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

FIG. 1 shows a conventional disc brake device, in which 1 is a caliper fixed to the vehicle body, and 2 is a rotor that is attached to a rotating shaft and rotates together.

The brake pads 3 are located on both sides of the rotor 2.
A, 3B are arranged, one brake pad 3A
is pressed by a hydraulic piston 4 that is slidably housed in a cylinder (not shown) inside the caliper 1.

In other words, when brake oil pressure increases during braking,
The piston 4 is pushed out and the brake pad 3A
The rotor 2 is clamped between the rotor 2 and 3B, and the rotation is braked by frictional force.

Rotor 2 is equipped with a
A large number of cooling holes 5 are formed in a radial manner.
The shape (cross-sectional shape) of this cooling hole 5 was the same shape, that is, symmetrical, with respect to the inner sliding contact portion 7 that contacts the brake pad 3A pushed by the hydraulic piston 4, and the outer sliding contact portion 6 outside thereof. .

By the way, during braking, the support arm 8 of the caliper 1
Since the side is inferior in rigidity to the side of the hydraulic piston 4, it is easily deformed as shown by the imaginary line, and as a result, excessive stress (frictional force) tends to be applied to the outer circumference of the rotor 2.

When the surface pressure on the outer periphery of the outer sliding contact part 6 increases, this part tends to overheat due to braking friction, creating a thermal imbalance in relation to the inner sliding contact part 7, which tends to cause heat checks and cracks. There was a problem.

The present invention aims to solve these problems.

For this reason, in the present invention, in a disc brake device in which both sides of the rotor are sandwiched through pads provided on the brake caliper, radial cooling holes are provided through the inside of the rotor, and a girder part that partitions the cooling holes is provided. The wall thickness is made thinnest at the middle part, and the thickness of the girder part on the outer sliding contact side opposite to the hydraulic piston is made thicker on the outer circumference side than on the inner circumference side of the rotor. Formed.

Based on the above structure, the heat capacity and strength of the outer sliding contact portion side are improved, so the occurrence of heat checks and cracks can be avoided, and the increase in weight can be suppressed to a minimum.

Hereinafter, embodiments of the present invention will be described based on the drawings.

Figure 4 shows the main parts of the present invention, and shows the rotor 2.
The girder part 9 that partitions each cooling hole 5 is designed so that its wall thickness is thinnest at the intermediate part between the outer sliding contact part 6 and the inner sliding contact part 7, and the outer sliding contact part 6
It is formed asymmetrically so that the thick portion 10 is present on the side. In addition, on the inner circumferential side of the rotor where there is less thermal stress, the thickness of the thick part 10 is made thinner than on the outer circumferential side as shown by the broken line, so that the girder part 9 is formed almost symmetrically. Weight increase is kept to a minimum.

This is formed by adjusting the draft angle of the core when molding the rotor 2.

The thick portion 10 may have a linear slope or may be formed in a curved shape.
Also, it is not necessarily the center of the thickness of the rotor 2,
As shown in the figure, the parting line of the core can also be formed at a position offset from the center.

As a result of the above, on the outer sliding contact portion 6 side of the rotor 2 where frictional heat is excessively concentrated due to deformation of the caliper support arm 8 during braking, the wall thickness of the girder portion 9 is increased, thereby increasing heat capacity and strength.

Therefore, the outer sliding contact portion 6 is protected from heat loss due to frictional heat, that is, from heat checks and cracks, and sufficient durability can be maintained. In addition to operating the caliper by hydraulic pressure to clamp the rotor, the rotor of the present invention can also be applied if the caliper is operated by pneumatic pressure or mechanically.

As described above, the present invention dramatically improves thermal durability without increasing the weight of the rotor by the simple means of providing a thick wall part on the rotor outer peripheral side of the girder part on the outer sliding contact side. This has the effect of improving the

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of a disc brake caliper, FIG. 2 is a partial side view of a conventional rotor, and FIG. 3 is a partial peripheral side view. FIG. 4 is a partial peripheral side view of a rotor according to an embodiment of the present invention. 1... Caliper, 2... Rotor, 3A, 3B...
...Brake pad, 4...Piston, 5...Cooling hole, 6...Outer sliding contact part, 7...Inner sliding contact part, 9...Girder part, 10...Thick wall part.

Claims (1)

[Scope of utility model registration request] In a disc brake device in which both sides of the rotor are held between pads provided on the brake caliper, radial cooling holes are provided through the inside of the rotor, and the thickness of the girder that partitions the cooling holes is The girder part on the outer sliding contact part side opposite to the hydraulic piston is formed so that it is thicker on the outer circumferential side than on the inner circumferential side of the rotor. disc brake rotor.