JPS62247955A - Braking device - Google Patents

Abstract

PURPOSE:To facilitate the easy movement of a pad accompanied with the change in the acting direction of braking force in a braking device which is kept functional when a car is stopped on an uphill road by providing shims in a plate form between braking pads and members pressing said pads. CONSTITUTION:The braking force of a disc brake is generated in such a way that fluid pressure is applied to a cylinder 2 for displacing a piston 81 to the side of a disc 10 wherein a main body 1 is accordingly displaced by its reaction to the direction opposite to that of the piston 81. In this case, when it is detected by a switch 20 that a braking pad 8 is displaced to one side direction because a car on an uphill road intends to run down, fluid pressure in the cylinder 2 is designed to be automatically maintained. In the aforementioned device, respective two shims 82 and 83, and 84 and 85 are provided between pressing members consisting of the piston 81 and a caliper portion 3, and each pad 8 and 11 wherein adjacent surfaces of each of the shims 82 and 83, and 84 and 85 are made to act as a sliding surface.

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]

The present applicant has previously developed a brake disk for the purpose of providing a brake device of this type that can perform appropriate operations depending on the condition of the wheels or the vehicle body when stopping or starting an automobile. a brake pad disposed so as to be able to come into pressure contact with the brake disc; and an actuation device that brings the brake pad into pressure contact with the brake disc in response to an external command;
A detection device detects all relative changes of the brake pad with respect to the vehicle body fixed part due to changes in the direction of frictional force between the brake pad and the brake disc, and a detection signal from the detection device is used to detect and issue commands to the manufacturing device. The present invention has proposed a brake device including a brake holding device that can maintain the frictional force until the direction in which it acts is changed again.

In the above specific example, the actuating device has a suppressing member that presses the brake pad toward the brake disc, and the brake pad has a shim attached to the suppressing member side. If the force that attempts to move the pad due to a change in direction is smaller than the frictional force between the pad and the member that presses the pad, the pad will not move. In this case, the detection device will not operate, making it impossible to maintain braking force.

In view of the above-mentioned problems, a brake device has been proposed that can reliably move the pad according to changes in the direction of application of the brake force. According to this, a low-friction member is disposed between the pad and a member that suppresses the pad to reduce movement resistance with respect to the pad.

The above-mentioned shim is for so-called noise prevention, and as is well known, a rubber film is laminated on both sides of the board.

Therefore, the low friction member and the rubber film come into contact9.
There will be no problem if the low-friction member also moves together when the pad moves, but due to the frictional force between the low-friction member and the rubber film or the deformation of the rubber film itself in the shear direction, there may be problems between them. A force is generated that tends to cause a relative displacement between the two, and there is a possibility that the relative fluctuation will occur someday. It also serves to prevent the pad from moving.

[Problem that the invention seeks to solve]

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

[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 the brake pad with respect to a fixed portion of the vehicle body based on a change in direction; and a detection device capable of sustaining engagement with the actuating device based on a detection signal of the detection device until the direction of action of the frictional force changes again. a brake holding device, wherein the actuating device has a pressing member that presses the brake pad toward the brake disc, wherein at least two A plate-shaped shim is interposed,
This is achieved by a brake device with gold finger surfaces on the adjacent surfaces of the two shims.

[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, moves the holding device back, and releases the hydraulic pressure of the brake device. In this way, the brake can be held and released depending on the condition of the wheel.

At least two plate-shaped shims are interposed between the pad and the member that presses the pad, and the adjacent surfaces of these two shims are used as sliding surfaces, so the pad can prevent changes in the direction of braking force. can be easily moved based on Therefore, the brake can be held securely.

In addition, since the two shims are adjacent to each other on the sliding surface, one shim can move freely relative to the other without generating any force that would cause relative displacement. This prevents the shim from changing.

〔Example〕

First, a disc brake in a brake device according to an embodiment of the present invention will be explained with reference to FIGS. 1 to 3.

In the figure, the disc brake is indicated as a whole by l, and the main body (1) consists of a cylinder part (!) and a caliper part (3), and has a known internal structure. Cylinder 111 (
2) An input cap (4) for receiving hydraulic pressure from the mask cylinder is formed inside K, and the piston in the cylinder part (2) receives the hydraulic pressure from this and slides forward through the cylinder hole. Then, cylinder g (2) and part of the caliper (3
) is configured to move in the opposite direction to the piston due to the reaction force.

A pair of arm portions (sa) extend laterally from the cylinder portion (2).
) (sb) protrude, and these are slidably guided in the front-rear direction by guide devices (tsa) and (sb), respectively. The guide devices (6a) (6h) are arm portions (7a) (7b) of a bifurcated base member (7) fixed to the vehicle body.
Supported by

A pad plate (8) is in contact with the tip of the piston 6υ in the cylinder part (2) of the main body (1) via two shims Sa&l, and the brake lining (8) is in contact with the pad plate (8). 9) is attached. Part (3) of the caliper straddles the disc that rotates with the wheel.
The fork-shaped arm portions (3a) (3h) are in contact with the other pad plate α via two shims. A brake lining (2) is also attached to this pad. The disc rotor αQ is interposed between the brake linings (9) and (2) with a slight gap.

Since the guide devices (6a) and (6b) have the same configuration, only one guide device (6a) will be described.

In the guide device (6a), the arm portion (5) of the main body (1)
The sleeve fitting is fitted into the hole formed in a), and the bolt Cll9 is inserted through this and screwed onto the arm portion (7a) of the base member (7) and tightened.
B), POL) Q41, Sleeve (to) is the base member (7)
be integrated with.

The same end portion of the sleeve is covered by a retractable rubber boot (6).

The other guide device t (6b) is similarly configured, and the main body (
1) is slidably guided in the axial direction by these K.

Pad plate (8) East is made by bending a leaf spring 1
It is elastically supported on the arm portions (7a) (7h) of the base member (7) by the exit side retainer (to) and the input side retainer α14, and is movable by a predetermined amount in the axial direction and circumferential direction. ing. Note that the output side retainer Q119a8 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 Q41 extending in the circumferential direction is formed in one arm portion (7h) of the base member (7), and the switch (7) is lowered in this recess Q41. Switch (7) operating rod (20a
) is inserted through the notch (19C) formed in one bent part (19b) of the rotation side retainer 4, and the same retainer (6) is inserted.
It is equivalent to the other bent part (X9a). Bent part (1
9a and 19b are in elastic contact with the side surface of the pad plate (8) ση and the inner surface of the arm portion (7b) of the base member (7), respectively. The actuating a-rad (20a) of the switch (4) is biased to the left in FIG. 1 (by the spring that the switch (7) is self-promoting) and comes into elastic contact with the bent portion (19a) of the retainer Q1.

The brake lining (9) of the pad plate (8) will be damaged by the disc rotor (IL) due to the dragging phenomenon even during pre-kine operation.
However, at this time, the frictional force between them may bias the pad plate (8) to the right in Fig. 1, but this biasing force causes the retainer 4 to The sum of the elastic force of the bent portion (19a) and the spring force of the spring built into the switch (1) and urging the actuating rod (ZOa) to the left is assumed to be sufficiently large.

A rubber tube α2 and a rubber ring are interposed between the switch ■ and the inner wall surface of the recess Q4, which allows the switch (
7) is cut off from the stroking force applied to the base member (7) and is insulated from the base member (7).

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

As mentioned above, each pad plate (8) oJJ has two shims 0 and g! The piston member υ and the arm portions (3m) and (3b) are in contact with each other via the shims 4a, and the details of these shims and the pad plate (8) and 4 will be explained with reference to FIGS. We will explain the installation relationship with the Note that only the pad plate (8) 11 will be explained. Pad plate αη
The same goes for the sides.

As shown in FIG. 4, the inner shim is made up of a metal plate Qυ and a rubber layer (A) attached thereto, and the rubber layer (A) is in contact with the pad plate (8). The outer shim field also consists of a metal plate (c) and a rubber layer (material) attached to it9.
The rubber layer 193 is in contact with the piston member υ. And metal plate ana3o surface (9ts) (93s) Comrade is
There is contact L. These surfaces (918) and (938) serve as passive surfaces, and depending on the case, they may be subjected to polishing or buffing in order to reduce their coefficient of friction.

As shown in Fig. 6, the pad plate (8) has protrusions formed at each central portion, and protrusions (95a) (95b) are also formed on both lower protrusions (8 pass/8b). . Corresponding to these protrusions +94) (95a) and (95b), the inner shim (c) has a round hole 19e (98a
) (98b) are formed, and these fit into the projections (95a) (95b) of the pad plate (8). Holes (97a) and (97b) for sealing grease are further formed in the shim. Grease yo Shishim SZg! 3 side (
The sliding resistance between 918 and 938 is further reduced.

There is a protrusion cMJ (95) on the pad plate (8) on the outer side Af83.
a) Corresponding to (95b), play hole M (100a) (1
00b) is formed, and FIG. 5 shows the combination of the pad plate (8) K inner shim a and outer shim at in good condition.
) That is, the pad plate (8) has these holes al (100
1) It is possible to move within the range of (100b).

Further, claw portions (101a) (1) are provided on both side edges of the outer shim field.
01b) are formed, which are bent at 0 degrees as shown in FIG. 4 and are elastically engaged with both side edges of the pad plate (8).

The above describes the structure and installation relationship of the inner and outer shims on the pad plate (8) side, but the inner and outer shims on the east side of the other pad plate (2)
The same applies to the configuration and mounting relationship of (f).

Note that the squeal prevention shim has a known structure.

Rubber sheets t are attached to both sides of a sheet-shaped iron material a.

The disc brake system in this embodiment is constructed as described above. Next, the entire brake system including the disc brake system will be explained with reference to FIG. 9.

In FIG. 9, a brake pedal is connected to a brake/dem master cylinder C311, and its first hydraulic pressure generator is connected via a pipe W to the wheel cylinders of the rear wheels (34a) (34b). The second hydraulic pressure generation chamber is connected to the wheel cylinders of the front wheels (ASA) (ASB) through a conduit, a solenoid valve (toward), and a conduit (three of them). Disc brakes are used.

One lead SaU of the switch (1) in the disc brake I is connected to the positive terminal t41K of the battery via the electric line Ul, and the other lead wire Qυ is connected to the electric line (4
1a), tilt detection switch σ (1,5afP□□□ solenoid (36m), connected to the negative terminal (0) of the battery via the electric line (41b).

The solenoid valve (to) is a 2-position solenoid switching valve, and is a 2-position solenoid switching valve.
When 36a) is not energized, it assumes position D due to the force of the spring (36b), allowing communication between the conduit (end) and the pipe, but when it passes through the renoid (36m), it assumes position E. , the pipes (to) and (b) are made non-communicating.

The switch - is a switch that is closed by the back torque of the car's wheels when the car stops on the road, and a brake switch σ and an accelerator switch Q are connected in parallel with this switch. The placket switch (crl) is closed when the brake pedal C33 is depressed, and the accelerator switch t17J is a switch that is closed when the accelerator is depressed.The above-mentioned tilt detection switch σG is a switch that is closed when the vehicle is on the road. It is.

Also, a check valve σJ is connected in parallel with the solenoid valve (to), but this is from the master cylinder 6D@ to the front 4 (38a) (
38b) toward the wheel cylinder side is defined as the forward direction. Therefore, even if the lunoid (3Sa) of the Xa valve (to) is excited and takes the E position, the front wheels (38a) (38b
) can apply the brakes.

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

Now, as shown in FIG. 10, it is assumed that the automobile is climbing up a slope S and the brake pedal is depressed to stop. In FIG. 8, arrow F indicates the direction of travel of the automobile, and arrow A indicates the direction of rotation of the wheels.

The pressure liquid from the mask cylinder (ill) is supplied to the wheel cylinders of the rear wheels (34a) (34b) through the pipe (to), and is also supplied to the wheel cylinders of the rear wheels (34a) (34b) through the pipe (to), and the magnetic valve (1) located at position D in the pipe (to).
), and is supplied to the wheel cylinders of the front wheels (38a) and (38b) through the pipe (b).

Brakes are applied to the wheels (34a), (34h), (38a), and (38b) to decelerate the vehicle. In the front wheel (38b), the plagier lining (9) 4 at the opening of the pad plate (8) comes into 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 (8) Oη in the direction of arrow B as shown in FIG. That is, in FIG. 1, the pad plate (8) (b) receives an urging force in the left direction. Therefore, the switch holder remains off, but the tilt detection switch t7 (l) is closed, and the switch remains off during play.

The accelerator switch συ and accelerator switch σ7J (since they are not pressed) are also closed. As a result, the solenoid (36a) of the stain solenoid valve (to) is energized and assumes the E position. The hydraulic pressure from the mask cylinder 6υ is applied to the front wheel (38a) via the check valve σ3.
(38b) is transmitted to the wheel cylinder.

When the car stops on a slope, the wheels rotate together with the disc rotor (11), which generates a rotational force in the opposite direction to that when the car is running, which causes the disc a-Y (to) and the pad plate (8) to rotate.
) The frictional force acting between Japan and the East is reversed. As a result, the pad plate (8) Qυ is pushed to the right in FIG. 1 by overcoming the sum of the elastic force of the retainer 4 and the spring force of the spring built into the switch (1). Actuation rod (
20a) is pushed in, the switch handle is turned on, and the solenoid (36a) of the TA valve (to) continues to be energized. In this state, when the driver releases the pressure on the brake pedal, the brake fluid flows back from the wheel cylinders of the rear wheels (34a) (34h) to the mask cylinder 6υ, but the solenoid valve (to) is in a blocked state. Therefore, the front wheels (38a) (38h
) Brake fluid does not flow back from the wheel cylinder, and pressurized fluid is held there.

This allows the vehicle to remain stationary on a slope.

To start the car, change gears, put the clutch pedal in the half-clutch state, and step on the accelerator pedal. The accelerator switch σ2 opens, and the front wheels (38b, l
The driving force is transmitted to the disk A-Y (to), the frictional force between this and the pad plate (8) συ is reversed again, the brake reaction force is in the input direction, and the pad plate (3) ση is It is pushed to the left and assumes the position shown in FIG. That is, the switch signal is turned off, and the energization to the solenoid (36a) of the electromagnetic valve is cut off. When the solenoid valve is in position D, the master cylinder 311 side and the wheel cylinder side are communicated again. The pressurized liquid held within the cylinder portion (2) passes through the solenoid valve (to) in the illustrated state and flows back to the mask cylinder 6υ. The brake is then released and the car starts.

In the above, when the brake pedal taa is depressed to further increase the braking force when the vehicle is stopped on the uphill road, the mask cylinder side and the wheel cylinder side are communicated with each other. This allows the braking force to be further increased.

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

That is, in FIG. 2, when the brake is applied, the pad plate (8) ση is in contact with the shim 18a on the sliding surface.
Piston 8B and arm part (3a) via tn and nw
(3h), so when the direction of action of the brake friction force changes, K can easily move in the circumferential direction of the pad plate (8). This allows the switch 4 to be turned on and off reliably, thereby improving the operability of the device.

Furthermore, according to this embodiment, since the inner and outer shims are in contact with each other on the sliding surfaces, they can be relatively easily displaced when the pad plate (8) east moves, and the other shims can be moved. Don't give any power. Therefore, both shims can always have an appropriate amount of 1tK.

Furthermore, in the above embodiments, since grease is applied to the sliding surfaces, the sliding resistance can be particularly reduced.

The embodiments of the present invention have been described above, but of course the present invention is not limited thereto and can be modified in various ways based on the technical idea of the present invention.

For example, in the embodiments described above, the brake is maintained only on the front wheels, but if the braking force is insufficient due to a bump, the braking force may be maintained on the rear wheels as well.

In this case, as already proposed, a valve device that receives the brake fluid pressure of the front wheels and closes accordingly may be provided between the mask cylinder and the rear wheels.

Further, in the above embodiment, the switch (7) was provided in the arm portion (7h) K of the base member (7) in the disc brake a, that is, it was provided on the (b) entry side of the disc a-ta (If). It may be provided on the delivery side. In this case, when the actuating rod (20a) is pushed in, the switch is turned off, but when the switch (1) is on, the xi
The circuit configuration may be such that power to the solenoid of the valve is cut off.

Furthermore, in the above embodiments, the movement of the pad plate in the circumferential direction is detected, but the movement in the radial direction may be detected.

Furthermore, the shapes of the shims (1) to (3) in the above embodiments are not limited to these, and the present invention is of course applicable to outer shims having the shapes shown in FIGS. 11 and 12. . That is, the outer shape of the present shim (102) is the same as that of the shim bag of the above-mentioned embodiment, but the claw portion (101a) (
Protrusion (i34) of pad plate (8) instead of 101b)
A pair of bent portions (104a) and (104b) are formed at both side edges of the notch (103) into which the notch (103) is fitted. This is K
As a result, the protrusion +94)' is held elastically. That is, the shim (102) is attached to the pad plate (8).

In addition, in the above embodiment, a rubber layer is attached to one side of both the inner and outer shims (c), but only the inner shim & IQIIS is attached with a rubber layer metal, and the outer shim 3 (2) is only a metal plate. It may also consist of Alternatively, there are two shims in the embodiment, but three shims are used, and the middle shim is made of a metal plate, and the inner and outer shims have the same structure as in the embodiment, and they are arranged so that they are in contact with each other. It's okay.

〔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 the vehicle even if the clutch pedal is not continuously depressed, and even when various members of the clap plate are worn out. It is possible to reliably obtain the effect that there is no timing lag between pedal operation and actual wheel or vehicle body movement in any case. Furthermore, the risk of the shims ensuring this shifting relative to the pad plate is avoided.

[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 of the same, FIG. 3 is a rear view of the same, FIG. 4 is an enlarged partially cutaway plan view of main parts, and FIG. The figure is a front view of the main part, Figure 6 is a front view of the pad plate in the main part, Figure 7 is a front view of the inner shim in the main part, and Figure 8 is a front view of the outer shim in the main part. , Fig. 9 is a piping system diagram showing the entire brake device, Fig. 1θ is a schematic side view of a wheel on a slope to show the operation of the same embodiment, and Fig. 11 is a plan view showing a modified example of the inner shim. 12 and 12 are top views. 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 the base brake pad with respect to a fixed part of the vehicle body; and a brake holding device that can maintain 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. In the brake device, the actuating device has a pressing member that presses the brake pad toward the brake disc, wherein at least two plate-shaped shims are interposed between the pressing member and the brake pad. The braking device uses the adjacent surfaces of these two shims as the sliding surfaces.