JPH01108425A - Vehicle breaking device - Google Patents

Abstract

PURPOSE:To prevent tilt deformation to enhance the effect of braking by providing such a braking hydraulic circuit that hydraulic oil is led into a cylinder from the innermost end of a support pin hole on the rotation input side through the center of a support pin. CONSTITUTION:A pressure oil inlet port 24 is formed in a hydraulic chamber 18a at the innermost end of a support pin hole 18 formed in a support member 14 located at one end of a rotation input side R1 on which disc rotor 10 enters into a braking device during a vehicle advancing. A first oil passage 25 is formed piercing the axially center part of a support pin 16. A second oil passage 27 communicating an attaching hole 26 communicated with the first oil passage 25 to a cylinder 20 is formed in a caliper 15. A moment canceling out a tilt deformation force generated is also generated in the caliper so as to prevent tilt deformation. Thereby it is possible to enhance the effect of braking and the durability thereof.

Description

[Detailed Description of the Invention] (Industrial Application Field) This invention is for a vehicle that brakes a wheel by pressing pad members from both sides of a disc rotor that is attached concentrically to an axle and rotates together with the wheel. This relates to a braking device.

(Prior Art) A type called a disc brake is often used as a braking device for a vehicle.

In this disc brake, a disc rotor consisting of a single disk is attached concentrically to the axle and rotates together with the axle. Both sides of the disc rotor serve as friction surfaces, and the disc rotor can be moved in a direction perpendicular to the friction surfaces. a pad member and
Pressing means for pressing this pad member against the friction surface of the disc rotor from both sides using hydraulic pressure is provided, and this pressing means is actuated by depressing the brake pedal in the driver's seat to brake the wheels. be.

There are two types of disc brakes: the off-pause type, in which the cylinder parts that press the pad members are located on both sides of the disc rotor, and the off-pause type, in which the cylinder parts are located only on one side of the disc rotor.
There are two types of pad members on the opposite side of the cylinder: a floating type (an example is shown in Figure 4) in which a caliper that straddles the disc rotor from the outer periphery moves and presses due to the reaction of the cylinder; the latter has a better structure. Most current vehicles use this floating type because it is easy to install and requires only a small installation space.

This invention also relates to a floating type, and in the case of a floating type, the caliper support point and the braking point are separated by a distance (L) in the vehicle width direction as shown in FIG. This tilt deformation action causes the pad member to come into partial contact with the disc rotor, reducing the braking force, causing uneven wear of the pad member, and causing noise.

Conventional solutions to these problems include anticipating tilt deformation and adjusting the pad member by inserting shims into the pad member. However, since the magnitude of tilt deformation varies depending on the application of the brake and is not constant, adjustment using shims is insufficient.

(Objective of the Invention) The present invention is intended to fundamentally solve the above-mentioned conventional problems, and provides a braking device for a vehicle that does not have the harmful effects of tilt deformation by creating another action that cancels out the tilt deformation of the caliper. The purpose is to provide

(Structure of the Invention) To achieve the above object, the present invention includes a disc cloak that is concentrically fixed to an axle and rotates together with the axle;
A pair of pad members are disposed on both sides of the disc rotor so as to be movable in a direction perpendicular to the friction surfaces on both sides of the disc rotor, and the pad members are arranged to apply braking fluid to the friction surfaces of the disc rotor. In a braking device having a pressing means that presses by pressure, a moment generation method that generates a moment in the pressing means using the braking fluid pressure in a direction opposite to the deformation direction of tilt deformation that occurs in the pressing means during braking. equipped with the means,
This is a braking device for vehicles.

In this vehicle braking device, the support point of the pressing means is located on the side of the disc cloak and is away from the braking point, so that the tilt deformation force generated in the pressing means is proportional to the brake fluid pressure. The same brake fluid pressure is used to generate a moment in the opposite direction to the tilt deformation direction in the pressing means, and this moment serves to cancel out the tilt deformation force, thereby preventing the pad member from detaching from the disc rotor due to the tilt deformation. This eliminates contact and prevents a decrease in braking force, and also eliminates noise caused by uneven contact of the pad member and uneven wear of the pad member, making it possible to eliminate the need for adjustment using conventional shims.

(Embodiments) The present invention will be described below based on embodiments shown in the drawings.

A cutaway plan view of essential parts of the braking device of the invention illustrated in FIG.
In the side view of FIG. 1 shown in FIG. 2 and the central sectional view of FIG. 1 shown in FIG.
As shown in the overall perspective view of the conventional product shown in the figure, it is fixed concentrically to the axle (11), and integrally with the axle (11) and the wheels (not shown) attached to this axle, as indicated by the arrow R in Figure 2. It rotates in the direction, and has friction surfaces (10a) on both sides (
10b), and this friction surface (10a) (10b
Pad members (12) and (13) are arranged at positions corresponding to the friction surfaces (10a and 10b), respectively.
a), (13a), and these pads (12a) (1
The back plate (12b) (13b) is fixed to the front surface of the back plate (12b) (13b), and protrusions (12c) (13c) are provided at both ends of the back plate (12b) (13b).

(14) is a support member that is fixed to the vehicle body (not shown) and is attached to the friction surface (10a) of the disc claw (1,0).
10b), and grooves (14a) (14b) are formed in the inward surfaces of the front and rear ends in a direction perpendicular to the friction surfaces (10a) (10b) of the disc rotor (10). Pad members (12
) (13), the protrusions (12c) and (13c) fit together,
Parad members (12) (13) are connected to the disc rotor (10).
) is movably supported relative to the support member (14) in a direction perpendicular to the friction surfaces (10a) (10b).

Next, the pressing means will be explained. (15) is a caliper, which includes a disc rotor (10) and a pad member (12) (
13), and a disc rotor (1
Support pins (16) (17) are provided to protrude in a direction perpendicular to the friction surfaces (10a) (10b) of
7;), and is slidably inserted into the support bin holes (1B) (19) provided at the front and rear ends in a direction perpendicular to the friction surfaces (10a) (10b) of the disc rotor (10). The caliper (15) is supported on the support member (14) so as to be movable in a direction perpendicular to the friction surfaces (10a) and (10b) of the disc rotor (10). A cylinder (20) is formed corresponding to the back plate (12b) of the cylinder (20).
) is fitted with a piston (21), and the front end surface of this piston (21) is connected to the back plate (12) of the pad member (12).
b), and when the brake pedal (not shown) is pressed from the back of the piston (21), pressurized oil (23) is supplied via a booster (not shown), and the piston (21) 1 in the direction of the arrow X in Figure 3, and place the pad member (12) on the friction surface (
10a), move the caliper (15) in the direction of the arrow X in Figure 3, and press the pad member (10a) on the opposite side.
The two bent parts (22) (22) protruding from the caliper (15) in contact with the back plate (13b) of the pad member (13) are connected to the friction surface (10b) of the disc rotor (10).
), and the pad members (12) and (13) sandwich the disc rotor (10) from both sides to perform braking.

When the brake pedal is released, the pressure of the pressure oil (23) decreases, causing the piston (21) that presses the pad members (12) (13) and the bent portion (22) of the caliper (15) to
) is released, the pad members (12) (13
) is no longer pressing on the disc rotor (10), and the braking of the wheels is released.

At the time of braking, the above-mentioned tilt deformation force (P) acts on the caliper (15) through the pad members (12) and (13) in the direction of the arrow in FIG.

The above configuration and operation are the same as before, and conventionally the cylinder (
20) was supplied from the position (K) shown by the imaginary line in FIG. 1 on the rear end surface of the cylinder (20), but in this invention, the pressure oil is The oil supply route is different, and this point is the main part of the present invention,
This serves as a moment generating means for generating a moment (Q) on the pressing means in a direction opposite to the deforming direction of the tilt deforming force (P).

That is, when the vehicle is traveling forward, the disc rotor (10
) is installed in the hydraulic chamber (18a) at the far end of the support pin hole (18) shown in FIG. 24)
A first oil passage (25) is formed by penetrating the axial center of the support pin (16) inserted into the support bottle hole (18), and a support pin (25) is provided in the caliper (15). 16) for attaching the first oil passage (25).
) from the mounting hole (26) communicating with the cylinder (20
) is formed in the caliper (15).

However, the support pin located at the end of the retraction side (R2) (
17) is just a guide pin.

Now, when the brake pedal is depressed and the pressure oil (23) enters the hydraulic chamber (18a) from the pressure oil inlet (24), the first oil passage (25L mounting hole (26)), the second oil passage (27 ), is introduced into the cylinder (20), and is introduced into the disc rotor (10).
), the above-mentioned tilt deformation force (P) is generated in the caliper (15), but at the same time the hydraulic chamber (18a
) The pressure oil that has entered the support pin (16) end (16a
) to move this support pin (16) out of the support pin hole (18), and then remove the caliper (15).
Push the insertion side end of the caliper (15) in the direction of arrow C.
) is generated in the direction of the arrow, and the direction is opposite to the tilt deformation force (P) generated in the same caliper (15), so this tilt deformation force (P) will be erased.

In this way, when the moment (Q) cancels out the tilt deformation force (P), the effect of deforming the caliper (15) disappears, and the entire surface of the pad members (12) (1, 3) is evenly distributed over the disc rotor ( 10) friction surfaces (10a) (10b
) in contact with the pad members (12) (1) to enhance the braking effect.
3) uneven wear is also eliminated, and the pad members (12) (13)
This is a conflict that can prevent noise from occurring due to uneven contact.

(28) is a seal ring, which prevents oil leakage at the sliding part between the support pin (16) and the support pin hole (18), and (29) is the same seal ring, which prevents oil leakage from the sliding part between the support pin (16) and the support pin hole (18).
) and the piston (21) to prevent oil leakage at the sliding part, (30) is a dust seal that prevents dust from entering the sliding part between the cylinder (20) and the piston (21), (31) (32) are dust boots with support pins (16) (17) and support pin holes (18) (19).
This prevents dust from entering the sliding parts.

The seal ring (28) is attached to the support pin (
16) is Figure 1 1! As shown in detail in the i-line circle, it deforms into the shape shown in the figure by moving in the direction of arrow B. When the hydraulic pressure is released in this state and the brake is released, the seal ring (28) is restored due to its elasticity. The force is applied to the support pin (
16) in the direction opposite to the arrow B, and pulls the caliper (15) back to the right in Fig. 1. Because the mass of this caliper (15) is large, the pad member is removed when the brake is released. Due to the reaction force of the pad member (13), the pad member (13) does not separate from the disc rotor (10) and is in slight contact with the disc rotor (10), causing an unpleasant dragging sound due to the rotation of the disc rotor (10). Parts (13
) is used to solve the problem of wear.

In addition, on the piston (21) side, because the mass of the piston (21) is small and the seal ring (29) has the same effect as the seal ring (28), the reaction force of the pad member (12) The pad member (12) can be easily removed from the disc rotor (10), and no dragging noise is generated.

(Effects of the Invention) According to the vehicle braking device according to the present invention described above,
By forming the hydraulic path for braking so that it leads from the back end of the support pin hole on the retraction side to the cylinder through the center of the support pin, a moment is also generated in the caliper that cancels out the tilt deformation force that occurs in the caliper during braking. By preventing tilt deformation, uneven contact of the pad member caused by tilt deformation is eliminated, increasing the braking effect, preventing unpleasant noise caused by uneven contact, and preventing uneven wear of the pad member. It can increase your endurance.

[Brief explanation of the drawing]

Fig. 1 is a cutaway plan view of essential parts of a braking device showing an embodiment of the present invention, Fig. 2 is a side view of Fig. 1 viewed in the direction of arrow A, and Fig. 3 is a line shown in Fig. 1. The sectional view and FIG. 4 are overall perspective views showing an example of a conventional braking device. 10... Disc rotor 10a, 10b... Friction surface 11... Axle 12.13
... Pad member 14 ... Support member 15 ... Caliper 16.17
...Support pin 18, 19...Support pin hole 20...Cylinder 21...Piston 24...Pressure oil inlet 25...First oil passage 27...Second oil passage 'P...Tilt deformation force Q ...Moment Patent Applicant Mazda Motor Corporation Agent Patent Attorney Takashi Mihara C (1 other person) Figure 1 R2 Figure 2

Claims (1)

[Scope of Claims] A disc rotor fixed concentrically to an axle and rotating together with the axle, and disposed on both sides of the disc rotor so as to be movable in a direction perpendicular to friction surfaces on both sides of the disc rotor. A braking device comprising a pair of pad members and a pressing means for pressing the pad members against the friction surface of the disc rotor using brake fluid pressure, the deformation direction being opposite to the deformation direction of the tilt deformation that occurs in the pressing means during braking. A braking device for a vehicle, comprising: a moment generating means for generating a moment in the pressing means using the braking hydraulic pressure.