JPS62265056A - Braking device - Google Patents

Abstract

PURPOSE:To make pad motion ever so easy, by installing a varying device, facilitating relative displacement of both elements, between a member pressing a brake pad to a brake disc and the brake pad. CONSTITUTION:A piston side varying device A is interposed between a piston 30 to be fitted in a cylinder part 2 and a pad plate 8, while a caliper side varying device B exists between an arm part 3a of a caliper part 3 and a pad plate 11. And, a movable member 31 is fitted in a concavity of the piston 30 at the specified clearance S1, and grease if sealed in this clearance S1, thus sealing takes place by an elastic material 33. And, a right end of the piston 30 and an outer circumferential surface of this movable member 31 are slidden with each other.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a brake device for automobiles, etc., and particularly to a brake device that allows easy starting on a road.

[Conventional technology and its problems]

First, this glazed brake device was made to be able to be pressed against the brake disc, with the aim of providing a brake device that can perform appropriate operations depending on the condition of the wheels or vehicle body when stopping or starting a car. Based on the brake pads to be arranged, the actuating device that presses the brake pads against the brake disc in response to an external command, and the change in the direction of action of the frictional force between the brake pads and the brake disc, A detection device that detects a relative change with respect to a fixed part, and a brake retainer that allows a command to the actuating device to be maintained based on a detection signal of the detection device until the direction of action of the frictional force changes again. A brake device has been proposed.

In the above specific example, the actuating device has a pressing member that presses the brake pad toward the brake disc, but the force that tries to move the pad due to a change in the direction of brake force application is , the pad will not move if it is small compared to the frictional force between the pad and the member that presses the pad. In this case, the detection device will not operate, making it impossible to maintain braking force.

[Problem that the invention seeks to solve]

The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide a brake device that facilitates the movement of a pad.

[Means for solving problems]

The above object is to provide a brake pad disposed so as to be able to come into pressure contact with a brake disc, an actuation device that brings the brake pad into pressure contact with the brake disc in response to an external command, and an effect of frictional force between the brake pad and the brake disc. a detection device that detects a relative change of a brake pad with respect to a single fixing portion based on a change in direction; and a detection device capable of sustaining a command to the actuating device based on a detection signal of the detection device until the direction of action of the frictional force changes again. and a brake holding device in which the actuating device has a pressing member that presses the brake pad toward the brake disc, wherein there is a gap between the pressing portion and the brake pad. A variable device is provided to facilitate target displacement, and the variable device applies the frictional force to a recess between a pair of sliding portions that can slide against each other and a recess provided on one of the sliding portions. An arrow part that fits with a predetermined gap in the action direction and is provided on the other sliding part side, and an elastic member that is placed under pressure between the protrusion and the inner wall of the recess and tries to secure the gap at a predetermined position. This is achieved by a brake device having a body.

[For production]

When a car comes to a stop on a road by applying the brakes, the brake pads are moved in one direction.

A detection device detects this movement and activates a holding device,
Hydraulic pressure is maintained in the brake equipment. When a rotational force is applied to the wheel, that is, the brake disc, in the forward direction in order to start the automobile, the pad is moved in the other direction.

The detection device detects this, causes the holding device to fully return, and the hydraulic pressure of the brake device is released. In this way, the brake can be held and released depending on the condition of the wheels.

Since a variable device is provided between the pad and the member pressing the pad to facilitate relative displacement thereof, the pad can be easily moved based on changes in the direction of application of the braking force. Therefore, the brake can be held securely.

Furthermore, the elastic body in the variable device prevents the pad from moving and causing pre-operation even if a so-called disc brake drag phenomenon occurs.

〔Example〕

First, a disc brake in a brake device according to an embodiment of the present invention will be explained with reference to all of FIGS. 1 to 4.

In the figure, the disc brake is shown as a whole by a square, and the main body (1) consists of a cylinder part (2) and a caliper part (3), and has a known internal structure. Cylinder part (2)
An input mouthpiece (4) for receiving hydraulic pressure from the mask cylinder is formed inside the cylinder part (2), and the piston in the cylinder part (2) slides forward through the cylinder hole in response to the hydraulic pressure from the cylinder. The main body (1), consisting of the caliper part (2) and the caliper part (3), is configured to move in the opposite direction to the p-piston due to the reaction force.

From the cylinder part (2), a pair of arm parts (5a
) (5b) protrude and are guided by guide devices (6a) and (6b) so as to be slidable in the front and rear directions, respectively. The guide device i1 (68X6b) is attached to arm portions (7a) (7b) of a bifurcated base member (7) fixed to the vehicle body.
) is supported by

A brake lining (9) is attached to the pad plate (8) that is pressed by the piston in the cylinder part (2) of the main body (1).
is pasted. The caliper part (3) straddles the disc rotor QI that rotates with the wheel, and the brake lining (6) is also attached to the pad plate Qη that is pressed by the fork-shaped arms (3a) and (3b). ing. The disc a-tar (10 is interposed between the brake lining 61 and O'4 with a small gap between them). Since the guide devices (6a) and (6b) have the same configuration, one (
6a) will be explained.

In the guide device (6a), the arm portion (5) of the main body (1)
A sleeve (2) is fitted into the hole formed in a), and the bolt 04 is inserted through this and screwed onto the arm portion (7a) of the base member (7) and tightened. α
(141, Sleeve α) is integrated with the base member (7).

Both ends of the sleeve (2) are covered by elastic rubber boots (c) and (to).

The other guide device @ (6b) is constructed in the same way, and the main body (1)
are slidably guided in the axial direction by these.

The pad plate (8) Oη is attached to the arm portions (7a) (7b) of the base member (7) by the four sides of the output side retainer (G) and the input side retainer (G) and the input side retainer, which are formed by bending leaf springs, respectively. It is supported elastically and is movable a predetermined amount in the axial and circumferential directions. Note that the output side retainer (g) may be omitted in some cases in order to increase the amount of movement of the pad plate (8) in the circumferential direction.

A recess (241) extending in the circumferential direction is formed in one arm portion (7b) of the base member (7), and a switch (E) is inserted into this recess (241).
is fitted. Switch (E) operating rod (20
a) shows one bent part (19
The notch (19c) formed in b) is inserted through the notch (19c) and abuts against the other bent part (19a) of the same retainer. The bent portions (19a) and (19b) are respectively pad plate (8)a.
It is in elastic contact with the side surface of υ and the inner surface of the arm portion (7b) of the base member (7). Switch rod operating rod (20a)
is biased to the left in FIG. 1 by a spring built into the switch (A), and comes into elastic contact with the bent portion (19a) of the retainer α1.

The brake lining (9) of the pad plate (8) can come into contact with the disc a-tar σQ due to the drag 9 phenomenon even during pre-kine operation, but at this time the brake lining (9) of the pad plate (8) ) may be biased to the right in Fig. 1, but due to this biasing force, the elastic force of the bent portion (19a) of the retainer a9 and the built-in switch σ move the actuating rod (20a) to the left. The sum of this and the spring force of the biasing spring shall be sufficiently large.

A rubber cylinder and a rubber ring E are interposed between the switch handle and the inner wall surface of the recess (24+), so that the switch 4 is vibration-isolated from the vibration force that the base member (7) receives. It is insulated from (7).

The entire disc brake is mounted through the mounting hole (
17a) (Hb) is fixed to a part of the vehicle body (not shown). Note that Qυ is a lead wire, and (251 is a leader).

Next, a variable device according to the present invention will be explained with reference to FIG.

The variable device of this embodiment consists of a piston-side variable device A and a caliper-side variable device B. The piston-side variable device A includes a piston 61 that fits into the cylinder portion (2) and a pad plate (8).
), and the caliper side variable device @B is located between the arm portions (3a) (3b) of the caliper portion (3) and the pad plate αυ.

First, to explain about the piston side variable device [A], the piston (7) has a socket shape, and a movable member (3υ) of the same socket shape is fitted in this recess with a predetermined gap SI. Reducing diameter step portions (32a) (32b) are formed on the outer circumferential wall of the cylindrical portion (support), and the above-mentioned gap S is formed between these and the inner circumferential wall of the piston (:!A). According to this embodiment, grease is sealed in this gap Sl, and this is sealed by the elastic material t331 fitted to the tip of the movable member circle.For this purpose, the elastic material G
The outer circumference of the piston C (30) is in elastic pressure contact with the inner wall of the piston C (30), and the outer circumference (31a) of the movable member 6υ is in contact with the outer circumference of the movable member 6υ. A piston boot of a known shape is fixed between the piston and the piston flash. A shim 9 is attached to the pad plate (8), and the pad plate (8) is in contact with the movable member 6υ via this. C351 is a seal ring.

The caliper side variable device r3 is configured as a pair with the arm parts (3a) and (3b), but since they are the same, only the arm part (3a) side will be explained.
) is formed with a stepped protrusion (1], a), into which, for example, an elastic member (3!1) made of rubber is fitted in an uneven relationship.In addition, the pad plate (IIJ has an inner shim C3η). is attached to the pad plate (11,
It fits into the large diameter part of the stepped protrusion (ita) of No. 1. The force exerted by the inner shim is that the left side is a rubber surface and is in contact with the pad plate (IIJ), and the right side is a metal surface that is in contact with the metal surface of the outer shim. These surfaces are the sliding surfaces. There is a recess on the outer shim. (38a) is formed, and the above-mentioned elastic member 6
1 is fitted. Inner shim C37) and elastic member 6
], and according to this embodiment, a gap S is formed between
This is filled with grease. Inner shim 07)
The outer shim and the outer shim extend considerably long above and below the gap S, and are in sliding contact with each other, and the elastic member (39) is in elastic contact with the recess (38a) of the outer shim (to), so that the gap S,
These seal the grease inside. The recess (38a) of the outer shim is connected to the hole (4) of the arm (3a).
Note that the size of the gaps S, , S, is sufficiently larger than the amount of movement S for operating the switch (1) of the pad plate (8) 01).

The disc brake (a) in this embodiment is constructed as described above. Next, the entire brake system including this disc brake will be explained with reference to FIG. 5.

In FIG. 5, a brake pedal (44) is connected to the tandem master cylinder (4υ), and its first hydraulic pressure generating chamber is connected to the wheel cylinders of the rear wheels (44a) (44b) through a pipe (431). The second hydraulic pressure generating chamber is connected to a pipe line (45
), through the magnetic valve (46) and the pipe (4η) to the front wheel (48
a) Wheel cylinder (48b) is connected. The above-mentioned disc brake (801) is used for the wheel cylinder of the front wheel (48b).

One lead wire of the disc brake (switch in 8ol) is connected to the positive terminal 6I of the battery via the electric wire (4!Jl), and the other lead wire I211 is connected to the electric wire (51a) and the tilt detection switch tm, tt. Magnetic valve (46
) is connected to the battery's fin inus terminal (52) via the electric line (slb).

The solenoid valve (46) is a two-position solenoid switching valve, and when the solenoid (46a) is not energized, the spring (46b) acts to change the D position to 9 and the conduits (451 and (47)). However, when the solenoid (46a) is energized, the positions of E and 9 and the pipe line (4ω and (4) are disconnected from each other.

The switch (4) is a switch that is closed by the back torque of the wheels of the car when the car stops on the road, and a brake switch f811 and an accelerator switch poppy are connected in parallel with this switch. Brake switch Kn
is a switch that is closed when the brake pedal (44) is depressed, and the accelerator switch E is a switch that is closed when the accelerator is depressed.The above-mentioned inclination detection switch I' is a switch that is opened when the vehicle is on the road.

Also, a check valve (to) is connected in parallel with the solenoid valve (4G), but this is connected from the 1-star cylinder (4υ side to the front wheel (4
8a) (48b) toward the wheel cylinder side is defined as the j-vaginal direction. Therefore, even if the solenoid (46a) of the electromagnetic valve (46) is energized and takes the position E, the front wheel (46a)
It is possible to fully apply the brakes to 8a) (48b).

The embodiment of the present invention is configured as described above, and its operation, effects, etc. will be explained next.

Now, as shown in Figure 6, the car is climbing the slope S.
It is assumed that the brake pedal t42J tm is depressed to stop the vehicle. In Fig. 6, arrow F indicates the direction of travel of the car;
Arrow A is the direction of rotation of the wheel.

Pressure fluid from the mask cylinder (4υ) is supplied to the wheel cylinders of the rear wheels (44a) (44b) through the pipe (43), and also to the solenoid valve (46) located at the pipe line (41, D).
1. It is supplied to the wheel cylinders of the front wheels (48a) (48b) through the pipe (4η).

Brakes are applied to the wheels (44a), (44b), (48a), and (48b) to decelerate the vehicle. In the front wheel (48b), the brake linings (9) and (6) of the pad plate (8) C1η are in pressure contact with the disc rotor αQ, and a frictional force is generated between them.

As a result, a brake reaction force acts on the pad plate (8) in the direction of arrow B as shown in FIG. 6. In other words, in FIG. Therefore, the switch handle remains off, but the tilt detection switch a is closed, and the brake switch Gυ and accelerator switch Q33 (9 are also closed because they are not depressed).This causes the solenoid (46a) of the solenoid valve (461 It is energized and assumes the position E. The hydraulic pressure from the mask cylinder (4υ) is transmitted to the wheel cylinders of the front wheels (48a) (48b) via the check valve 3.

When the car stops on a slope, the disc rotor QO, which was rotating with the wheels, receives a rotational force in the opposite direction to that when the car was running, and the disc rotor α0 and the pad plate (8>
The frictional force acting between lη and lη is reversed. As a result, in Fig. 1, the pad plate (8) C1η overcomes the sum of the elastic forces of the retainer 4 and the elastic members of the variable devices A and B, and the spring force of the spring built in the switch (1), and moves to the right. being pushed towards The actuating rod (20a) is pushed in, the switch handle is turned on, and the solenoid (46a) of the electromagnetic valve (c) continues to be energized. In this state, when the driver releases the pressure on the brake pedal (44), the brake fluid flows back from the wheel cylinders of the rear wheels (44a) (44b) to the mask cylinder (4υ), but the solenoid valve is in a blocked state. Therefore, brake fluid does not flow back from the wheel cylinders of the front wheels (48a) (48b), and pressurized fluid is maintained there.This allows the vehicle to maintain a stopped state on a slope.

In order to start the car, change gears 9, put the clutch pedal in the half-clutch state, and step on the accelerator pedal.The accelerator switch 183 opens, and the driving force is transmitted to the disc rotor αQ of the front wheel (48b). The frictional force between the pad plate (8) (11, 1) is reversed again, and the brake reaction force is in the input direction, pushing the pad plate (8) 0υ to the left, as shown in Figure 1. In other words, the switch (E) is turned off, and the solenoid valve (461 solenoid (
46a) is de-energized. Solenoid valve +46) is again D
The 0υ side of the cylinder and the wheel cylinder side are communicated with each other. The pressure fluid held within the cylinder portion (2) flows back to the mask cylinder (41) through the electromagnetic valve +461 in the illustrated state. The brake is then released and the car starts.

In addition, in the above, in order to further increase the braking force when stopping on the uphill road, when the brake pedal (4-wheel pedal) is depressed, the mask cylinder side and the wheel cylinder 1u
ll'. In this way, the braking force can be further increased.

This embodiment operates as described above, but also has the following effects.

That is, in FIG. 4, when the brake is applied, the pad plate (8) αη is moved through the piston (7) and the arm portion (3) of the caliper portion (3) via the variable devices A and B, respectively.
Since it is pressed by a) and (3b), the pad plate (8) Qη can easily move in the circumferential direction when the direction of action of the brake friction force changes. This makes it possible to reliably turn the switch on and off, thereby improving the operability of the device.

That is, in the variable device A, since the sliding contact surfaces (30a) and (31a) between the piston miss and the movable member 6υ are filled with the grease filled in the gap 8I, the coefficient of friction between them is sufficient. The movable member 6 is small in size and the elastic member and piston boot (b) can be easily deformed.
11 can be easily displaced together with the pad plate (8) relative to the piston circle.

In addition, in the variable device B, since the sliding surface of the shimia (to) is filled with the grease filled in the gap S, the coefficient of friction is sufficiently small, and the elastic member t31 is easily moved. The pad plate may be deformed.

Although the embodiments of the present invention have been described above, the present invention is of course not limited thereto, and various modifications can be made based on the technical idea of the present invention.

For example, as a piston-side varying device, a modification shown in FIG. 7 or FIG. 8 can be considered.

In the variable device A according to the modified example of FIG. 7, the piston 651
A ring-shaped recess formed on the outer circumference of the ring-shaped member (G) is fitted with an elastic ring member (rubber) 57) and a sliding ring 681. This sliding ring (581) and the end surface of the piston 551 are in sliding contact. (51 is a sealing member (59) made of an elastic material.
1, and the gap S is filled with grease.

6α is a piston boot. It is clear that this modification also provides the same effect as the variable device of the above-described embodiment.

In the variation device A according to the modified example of FIG. 8, a movable member in the shape of a tip is fitted into the piston 6υ, and is in sliding contact with the piston 6υ at an arc-shaped recess (61a) and a convex portion (62a), respectively. (63) is a sealing member made of an elastic material 1631, and the gap S is filled with grease. 461 is a biston boot. It is clear that the same effects as the variable device A of the above embodiment can be obtained in this modification as well.

FIG. 9 and FIG. 1θ show modified examples of the caliper side variable device. In the variable device B according to the modified example of FIG. ), and its small diameter portion is supported within the hole of the pad plate CIl,l by an elastic member. In addition, a besilling material made of synthetic resin is fitted to the large diameter part, and this is attached to the arm part (3a
) or (3b). The pan sealing material and the outer surface of the pad plate Qυ serve as sliding surfaces.

The gap S is filled with grease. In the variable device B according to the modified example of FIG.
In b), the small diameter portion is supported within the hole ql by the elastic member συ. In addition, a sealing member (74) made of synthetic resin or rubber is fitted to the large diameter portion, and this is a pad plate (II,
It is attached to 1. The surface where the large diameter portion of the moving member 11 (610) and the arm portion (3a) or (3b) of the caliper (3) are in contact with each other becomes a sliding surface.The gap S is filled with grease.

It is clear that the modified examples shown in FIGS. 9 and 10 also have the same effect as the variation device B of the above-described embodiment. In addition,
The size of the gaps S, ~Sa in each of the above-mentioned modifications is assumed to be larger than the amount of movement S of the pad plate (8) Qη for actuating the switch cA, as in the embodiment.

In addition, in the above embodiment and each modification, the gaps 81 to 81 are filled with grease, but the same effect as described above can be obtained without filling the gaps by sufficiently reducing the frictional resistance of each sliding surface. It will be done.

Further, in the above embodiment, the arm portion (3a) of the caliper (3)
) (3b), the same variable device B is provided, but a different variable device, for example, a variable device B is provided for the arm portion (3a), but a variable device B is provided for the other arm portion (3b). is the variable device 13 in FIG. 9 or 10. or 61
All of them may be provided.

〔Effect of the invention〕

As described above, according to the brake device of the present invention, it is possible to maintain a stopped state of a vehicle, etc. even if the clutch pedal is not continuously depressed, and even when members such as the clutch plate are worn out, the pedal operation can be continued. Since the pad can be easily moved in accordance with changes in the direction of action of the frictional force, the effect that the timing of the actual movement of the wheels or the vehicle body will not deviate can be reliably obtained.

[Brief explanation of drawings]

Fig. 1 is a front view of a disc brake in a brake device according to an embodiment of the present invention, Fig. 2 is a plan view thereof, Fig. 3 is a rear view thereof, and Fig. 4 is a sectional view taken along line IV-IV in Fig. 2. , Figure 5 is a piping system diagram showing the entire brake device,
FIG. 6 is a schematic side view of a wheel on a slope to show the operation of the same embodiment, and FIGS. 7 to 1θ are enlarged sectional views showing modifications of the variable device in the above embodiment. In the figure,

Claims (1)

[Claims] A brake pad disposed so as to be able to be pressed against a brake disc, an actuating device that brings the brake pad into pressure contact with the brake disc in response to an external command, and a change in the direction of action of the frictional force between the brake pad and the brake disc. a detection device that detects a relative change of a base brake pad with respect to a single fixed part; and a brake holding device that can maintain a command to the actuating device based on a detection signal from the detection device until the direction of action of the frictional force changes again. In the brake device, the actuating device includes a pressing member that presses the brake pad toward the brake disc, wherein a relative displacement between the pressing member and the brake pad is facilitated. A variable device is provided, which includes a pair of sliding portions that are slidable relative to each other, a recess provided on one of the sliding portions, and a predetermined gap in the recess in the direction in which the frictional force is applied. It has a protrusion that fits together and is provided on the other sliding part side, and an elastic body that is placed under pressure between the protrusion and the inner wall of the recess to ensure the gap at a predetermined position. brake equipment.