JPH02102933A - disc brake device - Google Patents

Abstract

PURPOSE:To prevent the outer circumferential movement of a brake pad at the time of braking by making the pad contact face of a disk rotor a pad inclined contact face with a given inclination with respect to an axis orthogonal with the rotor by increasing the thickness of the major diameter side of the disk rotor, and decreasing the thickness of the minor diameter side. CONSTITUTION:The pad contact faces of a disk rotor 1 are used as pad inclined contact faces 1a, 1b with a given inclination theta with respect to an orthogonal axis RR to the rotor by increasing the thickness of the major diameter side of the disk rotor 1 and decreasing the thickness of the minor diameter side. When the brake pads 3, 4 are pressed by the disk rotor 1, and therefore, the pressing reaction FR of the disk rotor 1 side is received by a wheel to generate a component force FIN in a major diameter direction as the radial component force of the pressing reaction FR of the brake pads 3, 4 side. Accordingly, force FOUT in the major diameter direction due to an uneven face stress distribution and force FIN in the minor diameter direction are cancelled to each other to suppress the outer circumferential movement of the brake pads 3, 4.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a disc brake device applied as a braking means to vehicles such as automobiles.

(Prior Art) Conventionally, as a disc brake device, for example, "Dictionary of Automotive Terms,!
Devices such as those described on page 92 are known.

As shown in Fig. 4, this conventional disc brake device includes a disc rotor provided on the wheel side, a caliper provided on the vehicle body side, and is supported by the caliper, and is located at opposing positions on both sides of the disc rotor. It includes arranged brake pads and a piston that applies a rotor pressing force to the brake pads.

(Problem to be Solved by the Invention) However, in such a conventional device, the surface pressure distribution between the disc rotor and the brake pad during braking is such that the surface pressure is highest on the upper side of the rotor rotation inlet, and the surface pressure is highest on the upper side of the rotor rotation inlet. The bottom side of the brake pad exhibits a non-uniform surface pressure distribution state with the lowest surface pressure, and as shown in Figure 5, a rotational moment is generated in the outer circumferential direction of the brake pad, causing the brake pad to move in the outer circumferential direction. As shown in FIG. 6, a measure is taken in which uneven portions are formed on the brake pad and the torque member to hold them together in the radial direction.

However, in this case, problems as listed in 2 below occur.

■ Water that enters the retaining area from the outside stays there,
This causes inconveniences such as easy rusting.

■ The sliding resistance of the brake pads increases and the loss of braking torque increases.

■ When the brake is released, the separation of the brake pad from the disc rotor is delayed, causing dragging.

The present invention has been made in view of the above-mentioned problems, and prevents the movement of the brake pad in the outer circumferential direction during braking without increasing component warping, rusting, braking torque loss, or dragging. The goal is to develop a disc brake device that can be used.

(Means for Solving the Problems) In order to solve the above problems, the disc brake device of the present invention includes a disc rotor provided on the wheel side, a caliper provided on the vehicle body side, and a disc rotor supported by the caliper. , in a disc brake device comprising brake pads disposed on opposite sides of a disc rotor, and a piston that applies a rotor pressing force to the brake pads, the pad contact surface of the disc rotor is connected to the outer diameter of the disc rotor. This means is characterized in that by increasing the thickness on the side and decreasing the thickness on the inner diameter side, a pad inclined contact surface having a predetermined inclination angle with respect to the rotor orthogonal axis is formed.

(Function) When the piston is stroked during braking to apply a pressing force to the disc rotor against the brake pad, the brake pad comes into pressure contact with the disc rotor.

At this time, the surface pressure distribution between the disc rotor and the brake pad exhibits an uneven surface pressure distribution state, and a force that attempts to move the brake pad in the outer circumferential direction is generated in the outer radial direction.

On the other hand, the pad contact surface of the disc 0-1 is made thicker on the outer diameter side of the disc rotor and thinner on the inner diameter side, making it a pad inclined contact surface that has a predetermined inclination angle with respect to the rotor orthogonal axis. Therefore, when the brake pad and the disc rotor are pressed against each other, the pressure reaction force on the disc rotor side is received by the wheel, and a radial component of the pressure reaction force on the brake pad side is generated in the inner radial direction.

Therefore, the force in the outer radial direction due to the uneven surface pressure distribution and the force in the inner radial direction due to the pressure contact reaction force on the brake pad side are opposite in direction, so the forces cancel each other out, and the outer periphery of the brake pad Directional movement is suppressed.

Note that the force in the outer radial direction due to uneven surface pressure distribution and the inner radial force due to the pressure reaction force on the brake pad side are both generated in proportion to the pad pressure contact force, regardless of the band pressure contact force. A similar countervailing force is always exerted.

(Example) Embodiments of the present invention will be described below based on the drawings.

First, the configuration will be explained.

Figures 1 and 2 show a disc brake device A according to an embodiment, which is of a type called a one-piston floating caliper type, and includes a disc rotor 1 provided on the wheel side (not shown) and a disc brake device A provided on the vehicle body side. Caliper 2 and
It includes brake pads 3.4 which are supported by the caliper 2 and placed opposite both surfaces of the disc rotor 1, and a piston 5 which applies a rotor pressing force to the brake pads 3.4.

The disc rotor 1 is fixed to a wheel huff or the like,
Rotates with the wheel.

The pad contact surface of the disc rotor 1 is made thicker on the outer diameter side of the disc rotor 1 and thinner on the inner diameter side, so that the pad contact surface of the disc rotor 1 has a predetermined inclination angle e with respect to the rotor orthogonal axis RR.
a pad inclined contact surface 1a having (0,5°≦θ≦3″);
It is set as 1b.

The caliper 2 is slidable in the direction of the rotor rotation axis of the disc rotor 1 via a caliper bracket 21 fixed to the vehicle body side and slide pins (PF and PR are pin axes, not shown) with respect to the caliper bracket. A cylinder part 22a and a rotor pressing reaction force part 22b are constructed of a caliper body 22 supported by a caliper body 22, a brake pad 3.4 is supported on one side of the caliper bracket 21, and a piston 5 is provided on the other side of the caliper body 22. is formed.

The brake pad 3.4 includes an inner brake pad 3 to which a rotor pressing force is directly applied by the piston 5;
and an outer brake pad 4 to which a rotor pressing force is applied by the reaction force, and both brake pads 3
．． 4 is adhesively fixed to the pad back metal 6.7.

The piston 5 is connected to the cylinder portion 2 of the caliper body 22.
2a, and its piston center axis PL is set parallel to the rotation axis of the disc rower 1.

Note that 8 is a brake fluid pressure chamber to which brake fluid pressure is supplied from a mask cylinder or the like during braking, 9 is a dust boot, and 10 is a piston seal that exhibits an automatic clearance adjustment function.

Next, the effect will be explained.

During braking, when the piston 5 is stroked by the brake fluid pressure generated based on the braking operation and the inner brake pad 3 is pressed against one side of the disc rotor 1,
The reaction force causes the caliper body 22 to slide in the opposite direction to the piston 5, and the outer brake pad 4 is pressed against the other surface of the disc rotor. As a result, both sides of the disc rotor 1 are held in pressure contact with the brake pads 3.4,
Adds braking force.

At this time, the surface pressure distribution between the disc rotor 1 and the brake pad 3.4 exhibits an uneven surface pressure distribution state, and as shown in FIG. F. uT occurs in the outer diameter direction.

On the other hand, by making the pad contact surface of the disc rotor 1 thicker on the outer diameter side and thinner on the inner diameter side, the pad contact surface of the disc rotor 1 is made to have a band inclination that has a predetermined inclination angle θ with respect to the rotor orthogonal axis RR. Since the contact surfaces 1a and 1b are used, when the brake pad 3.4 and the disc rotor 1 are in pressure contact, the pressure reaction force FR on the disc rotor 1 side is received by the wheel.
An inner radial component force FIN is generated as a radial component of the pressure reaction force F8 on the flake band 3.4 side.

Therefore, the force Fou T in the outer radial direction due to non-uniform surface pressure distribution
and the force FIN in the inner radial direction due to the pressure reaction force FR on the brake pad 3.4 side are in the opposite direction of action, so the forces cancel each other out, and the movement of the brake pad 3.4 in the outer circumferential direction is suppressed. be done.

Note that the force F in the outer radial direction is due to uneven surface pressure distribution. Ul, the pressure reaction force F on the brake pad 3.4 side, and the force FIN in the inner diameter direction are all generated in proportion to the pad pressure contact force, so they always have the same canceling effect regardless of the pad pressure contact force. is demonstrated.

As explained above, in the disc brake device A of the embodiment, it is possible to increase the number of parts.
Unlike conventional brake pads, rusting, braking torque loss, and dragging do not occur, and movement of the brake pads 3 and 4 in the outer circumferential direction during braking can be effectively prevented by the force canceling action.

In addition, the existing disc rotor can be bound to the inclined contact surface la.
, replace the disc rotor with a lb.
It can be easily adapted to existing equipment by simply processing the pad inclined contact surface on the existing disc rotor.

Although the embodiment has been described above based on the drawings, the specific configuration is not limited to this embodiment, and even if there is a design change within the scope of the gist of the present invention, it is included in the present invention. .

For example, in the embodiment, a one-piston floating caliper type device is shown, but it can also be applied to a two-piston or fixed caliper type device.

(Effects of the Invention) As explained above, in the disc brake device of the present invention, the thickness of the disc lower plate contact surface is increased by increasing the thickness on the outer diameter side and increasing the thickness on the inner diameter side. By making the pad thinner, the pad has an inclined contact surface that has a predetermined angle of inclination with respect to the orthogonal axis, which increases the number of parts. The effect of this is that the movement of the brake pad in the outer circumferential direction during braking can be effectively prevented by the force canceling action.

[Brief explanation of drawings]

FIG. 1 is a diagram showing a disc brake device according to an embodiment of the present invention.
2 is a partially cutaway plan view showing the disc brake device of the embodiment, FIG. 3 is an explanatory diagram of braking action in the disc brake device of the embodiment, and FIG. 4 is a conventional disc brake. FIG. 5 is a front view of the device, FIG. 5 is an explanatory diagram of braking action in a conventional disc brake device, and FIG. 6 is a diagram showing a pad outer circumferential movement restriction structure of the conventional disc brake device. A... Disc brake device 1... Disc rotor la, lb... Pad inclined contact surface 2... Caliper 3... Inner brake pad 4... Outer brake pad 5... Piston 6.7 ...Pad backing metal RR...Rotor orthogonal axis θ...Inclination angle

Claims (1)

[Scope of Claims] 1) A disc rotor provided on the wheel side, a caliper provided on the vehicle body side, and brake pads supported by the caliper and placed on opposite sides of the disc rotor; In a disc brake device equipped with a piston that applies a rotor pressing force to a brake pad, the pad contact surface of the disc rotor is made thicker on the outer diameter side of the disc rotor and thinner on the inner diameter side. A disc brake device characterized by having a pad inclined contact surface having a predetermined inclination angle with respect to a rotor orthogonal axis.