JPH0655586B2 - Disk breaker - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a disc brake device provided with a switch for detecting a movement of a pad based on a change in the action direction of a frictional force, and particularly to easy starting on an uphill road. The present invention relates to a disc brake device that can be performed.

[Conventional technology and its problems]

For example, in the brake device disclosed in Japanese Utility Model Laid-Open No. 55-43905, by depressing a clutch pedal, a valve device interlocked with this is closed, and hydraulic pressure is applied to a wheel cylinder of an automobile on an uphill road. Hold it and hold the brake. That is, the driver can stop the vehicle on an uphill road even if he releases his foot from the brake pedal, but he must continue to depress the clutch pedal.

When the vehicle is started, the clutch pedal is gradually returned, that is, in the half-clutch state, the accelerator pedal is stepped on to increase the engine speed to start the vehicle.

As described above, when the vehicle is stopped on an uphill road, the valve device is closed by depressing the clutch pedal and returning the clutch pedal at the time of starting, which is related to the valve device and the clutch pedal. When wear of various members, such as the clutch facing, occurs, the timing for opening the valve with respect to the position of the clutch pedal is constant, but sufficient driving force for starting from the engine to the wheels is transmitted via the clutch facing. It will be out of time. That is, the brake is released before the driving force is sufficiently transmitted to the wheels.

This is because in the above-mentioned conventional one, the clutch pedal is set to release when the clutch pedal is in a so-called half-clutch state in the clutch device, and the clutch facing is worn out. Then, the position is changed so as to be in the half-clutch state, and the release timing is not changed according to this change.

In this way, when the sufficient driving force is transmitted to the wheels,
If the time when the brakes are released deviates so that the latter becomes earlier and the latter becomes later, when the vehicle starts on an uphill road, it will move backward and cause an accident.

In view of the above problems, when the vehicle is stopped and started, the brake device that can perform an appropriate operation according to the state of the wheels or the vehicle body is operated by the hydraulic pressure transmitted from the master cylinder. A plurality of wheel brake devices provided for the wheels, and a solenoid valve that is provided in a pipe to at least one of the plurality of wheel brake devices and is normally in a communication position and can be switched to a shut-off position according to a command, A switch capable of sending the command to the solenoid valve, which is switched according to a change in the direction of action of the frictional force acting on the friction material of the wheel brake device, and the plurality of wheel brake devices include at least one disc brake. This disc brake is supported in the circumferential direction by a base member fixed to a non-rotating portion of the vehicle body via an elastically deformable retainer and is movable in the axial direction. A pair of pads, a caliper that straddles the pair of pads together with the disc rotor and is supported by the base member so as to be movable in the axial direction, and one pad provided adjacent to the one caliper. In a brake device having a cylinder device capable of directly pressing the other pad toward the disc rotor via the caliber, the switch is an action of a brake reaction force acting on the base member from the pad, Brake devices have been proposed that are actuated by inactivity.

According to the above braking device, the stopped state of the vehicle or the like can be maintained even if the clutch pedal is not continuously depressed, and even if a member such as the clutch plate is worn, the pedal operation and the actual wheel or vehicle body There is no deviation from the timing of the movement.

However, in the above disc brake device, the switch is provided on the base member, that is, the mounting bracket. Also, the pad is designed to transmit the brake reaction force to the mounting bracket. In such a configuration, the relative position between the switch and the pad changes, and a means for coping with wear is required.

[Problems to be solved by the invention]

The present invention has been made in view of the above problems, and an object of the present invention is to provide a switch so that a relative position change between a switch and a pad does not occur in a disc brake, and a malfunction is surely prevented.

[Means for solving problems]

The above object is to provide a pair of pads that are arranged across the disc rotor, a caliper that is arranged so as to straddle the disc rotor and the pair of pads, and a guide device that guides the movement of the caliper in the axial direction of the disc rotor. And a cylinder device which is provided on the caliper and is capable of directly pressing one of the pair of pads and pressing the other pad against the disc rotor via the caliper,
The pair of support portions provided on the caliper so as to transmit the acting force of the cylinder device to the other pad and guide the axial movement of the pair of pads, and the pair of support portions provided between the pair of support portions. In a disc brake device including a pair of springs for urging the pad, a switch that is activated by detecting a change in the action direction of frictional force by the movement of the pad is attached to the caliper so as to face the other pad. The pair of springs are installed so that both ends thereof engage with the pair of support portions and engage with the pair of pads at the central portion side, and are provided for the other pad among them. A disc brake device in which a spring is engaged with the pair of support parts in different acting directions so as to bias the other pad in the inoperative direction of the switch. It is achieved by.

[Work]

When the vehicle stops on an uphill road due to braking, one pad is pressed in one circumferential direction. The switch detects this pressing, closes the electromagnetic valve, and the hydraulic pressure is held in the brake device. When a turning force is applied to the wheels, that is, the disk rotor in the forward direction in order to start the vehicle, the pad is pressed in the other circumferential direction. This is detected by the switch, the solenoid valve is opened, and the hydraulic pressure of the brake device is released. In this way, the brake can be held and released depending on the state of the wheels.

Pads wear with use. However, there is no relative displacement between the caliper and the pad. Therefore, it is not necessary to take measures against the wear of the pad to operate the switch reliably.

That is, a switch that guides and supports a pair of pads by a pair of support portions provided on the caliper, and detects a change in the action direction of the frictional force by the movement of the pads to operate the switch.
When the pads are worn against the pad pressed by the disc rotor via the inner caliper of the pair of pads and mounted on the caliper, even if the pad is worn and displaced toward the disc rotor, the relative pad and switch Since the physical displacement does not occur, it is possible to reliably operate the switch and detect a change in the action direction of the frictional force regardless of the wear of the pad. Also, by providing only one spring for the pad pressed against the disc rotor via the caliper, not only the rattling of the pad in the disc rotor circumferential direction (direction detected by the switch) but also the disc rotor diameter outer side The rattling in the radial direction of the disc rotor is also suppressed by controlling the movement of the pad to prevent the switch from malfunctioning due to the rattling in the circumferential direction of the pad and the damage to the switch due to the rattling in the radial direction of the pad. Further, even if the movement of the pad to the radial outside of the disk rotor is restricted, this is formed by a spring that is bridged between the support portions, and therefore the portion that engages the pad from the radial outside to the support portion of the caliper. It is not necessary to form the pad, and the pad can be easily exchanged from the outer side of the disk rotor diameter via the pair of support portions by simply removing the spring.

〔Example〕

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

In the figure, the disc brake is indicated by (80) as a whole, and the caliper (1) as the main body is composed of a cylinder portion (2) and a pressing portion.
(3) and has a known internal structure. Cylinder part
An input mouthpiece (4) for receiving hydraulic pressure from the master cylinder is integrally formed in (2), and the piston in the cylinder part (2) receives the hydraulic pressure from this and slides forward in the cylinder hole. Caliper (1) consisting of cylinder part (2) and pressing part (3)
Is configured to move in the opposite direction to the piston by the reaction force.

A pair of arms (5a) diagonally laterally from the cylinder (2)
(5b) are protruding, and these are respectively guide devices (6a) (6
It is slidably guided in the front-back direction by b). The guide devices (6a) (6b) are supported by the arm portions (7a) (7b) of a bifurcated base member (7) fixed to the vehicle body.

A pad plate (8) is in contact with the tip of the piston in the cylinder portion (2) of the caliper (1), and a brake lining (9) is attached to the pad plate (8). The pressing portion (3) straddles the disk rotor (10) that rotates with the wheel, and is in contact with the other pad plate (11). The brake lining (12) is also attached to the pad plate (11). Disc rotor (10) has a slight clearance and brake lining
It is interposed between (9) and (12). Since the guide devices (6a) and (6b) have the same configuration, only one (6a) will be described.

In the guide device (6a), the guide shaft (13) is fitted to the tubular portion (14) formed at the tip of the arm portion (5a) of the main body (1). Base member (7) and the above-mentioned arm part
It is integrated through (7a). Both ends of the guide shaft (13) and the tubular portion (14) are covered with elastic rubber boots (15) and (16).

The other guide device (6b) is also configured in the same manner, and the caliper (1) is guided slidably in the axial direction by these.

Next, a related configuration of the caliper (1) and the pad plates (8) and (11) according to the present invention will be described with reference to FIGS. 2 and 4, in particular. Only one pad plate (11) will be described. The same applies to the other pad plate (8).

As shown in FIG. 2, the caliper (1) has an opening (30) formed at the center of the pressing portion (3), and a pair of support portions (1
Equipped with 8a) and (18b). These extend in the axial direction,
On this upper surface, both ears (11a) (11b) of the pad plate (11) are supported slidably in the axial direction as shown in FIG. In addition, shims (19a) and (19b) having an L-shaped cross section are interposed between them.

Also, the support portions (18a) (18b) of the pad plate (11) and the caliper (1)
A spring for holding the pad plate (11) in the circumferential direction between
(20) is stretched. This spring (20) is made of a wire-shaped elastic material, and has a central bent portion (2
1) and the arm portions (22) and (23) extending to the left and right, and the tip portions (22a) and (23a) of both arm portions (22) and (23) are bent, and one tip bent portion (22a) is elastically locked to one ear portion (11b) of the pad plate (11), and at one inclination portion α shown in FIG. 4, one support portion (18b) of the caliper (1) is provided. It is in pressure contact with the lower edge. The other tip bent part (23a) is a pad plate
Although not locked to the other ear (11a) of (11), the caliper (1)
Is pressed against the other support portion (18a) at an inclination angle β. Further, the central bent portion (21) of the spring (20) elastically presses and engages with the central protruding portion (11c) of the pad plate (11).

The spring (20), pad plate (11) and caliper (1) as described above.
Due to the engagement structure, the pad plate (11) has a predetermined gap S between the one ear portion (11b) and the support portion (18b) and the other ear portion.
The (11a) is held in the circumferential direction with respect to the caliper (1) while being in pressure contact with the supporting portion (18b). The other pad plate (8) and spring (50)
The same applies to the above.

Next, the arrangement of the switches will be described with reference to FIGS. 3 and 5.

A switch receiving portion (25) which similarly projects toward the central portion is provided below one of the support portions (18a) (18b) (18b) of the caliper (1).
Is formed, and the switch (27) is secured to the inner hole (26) (3
(0) is attached so that it does not come off and its operating part (28)
Is in contact with a bent portion (11d) formed at one end of the pad plate (11). (29) is a lead wire which can be led out from the switch (27). When the lining (12) wears as it is used, the amount of axial movement of the pad plate (11) during braking increases, but the caliper (1), that is, the switch receiver (25) also moves in the same amount by the same amount. As such, there is no relative displacement between the switch (27) and the pad plate (11). Therefore, the pad plate (1
Although the bent portion (11d) of 1) slightly extends in the axial direction in the present embodiment, this length may not be so large, and the actuating portion (28) of the switch (27) can be stably contacted. All you have to do is contact. In some cases, the bent portion (11d) may be omitted and abutted on one end surface of the pad plate (11).

The disc brake (80) in the present embodiment is constructed as described above. Next, the entire brake device including this will be described with reference to FIG.

In FIG. 6, a brake pedal (32) is connected to the tandem master cylinder (31), and the first hydraulic pressure generating chamber thereof has a conduit (3
It is connected to the wheel cylinders of the rear wheels (34a) (34b) via 3). The second hydraulic pressure generating chamber has a conduit (35), a solenoid valve (36) and a conduit.
The wheel cylinders of the front wheels (38a) and (38b) are connected via (37). The disc brake (80) is used for the wheel cylinder of the front wheel (38b).

One lead wire of the switch (27) in the disc brake (80) is connected to the positive terminal (40) of the battery via the electric line (39).
The other lead wire is the electric line (41a), the inclination detection switch (70), the solenoid (36a) of the solenoid valve (36), and the electric line.
It is connected to the negative terminal (42) of the battery via (41b).

The solenoid valve (36) is a 2-position solenoid switching valve,
When 6a) is not energized, the spring (36b) works to set the D position to connect the conduits (35) and (37), but when the solenoid (36a) is energized, the E position is set. , With conduit (35)
(37) is not connected to.

The switch (27) is a switch that is closed by the back torque of the wheels of the vehicle when the vehicle stops on an uphill road, and a brake switch (71) and an accelerator switch (72) are further connected in parallel with this. The brake switch (71) closes when the brake pedal (32) is depressed, and the accelerator switch
(72) is a switch that closes when the accelerator is depressed. The tilt detection switch (70) described above is a switch that closes when the automobile is on an uphill road.

Also, a check valve (73) is connected in parallel with the solenoid valve (36), but this is in the forward direction from the master cylinder (31) side to the wheel cylinder side of the front wheels (38a) (38b). . Therefore, even when the solenoid (36a) of the solenoid valve (36) is excited to take the E position, the front wheels (38a) (38b) can be braked.

The embodiment of the present invention is configured as described above. Next, the operation, effect and the like will be described.

Now, as shown in FIG. 7, the car is climbing a slope H,
It is assumed that the brake pedal (32) is depressed to stop. In FIG. 7, arrow F is the traveling direction of the vehicle, and arrow A
Is the direction of rotation of the wheels.

The hydraulic fluid from the master cylinder (31) passes through the conduit (33) to the rear wheel.
Wheel cylinders for the front wheels (38a), (38b), which are supplied to the wheel cylinders of (34a) and (34b), and through the conduit (35), the solenoid valve (36) at the position of D, and the conduit (37). Is supplied to.

The wheels (34a) (34b) (38a) (38b) are braked and the vehicle slows down. Disc rotor (10) at front wheel (38b)
The brake linings (9) and (12) of the pad plates (8) and (11) are pressed against and the frictional force is generated between them. This makes the pad
(8) The brake reaction force acts on the (11) in the direction of arrow B as shown in FIG. This reaction force is received by the caliper (1). That is, in FIG. 3, the pad plates (8) and (11) are biased to the left. Therefore, although the switch (27) remains off, the tilt detection switch (70) is closed, and the brake switch (71) and the accelerator switch (72) (since they are not stepped on) are also closed. As a result, the solenoid (36a) of the solenoid valve (36) is excited and takes the E position. Hydraulic pressure from the master cylinder (31) is passed through the check valve (73) to the front wheels (38a) (38
It is transmitted to the wheel cylinder of b).

When the car stops on a slope, the disc rotor (10), which was rotating with the wheels, generates rotational force in the opposite direction to that when it was running, and the disc rotor (10) and the pad plates (8) (11) The frictional force working in the opposite direction is reversed. As a result, in FIG. 3, the pad plates (8) and (11) are pushed to the left by overcoming the sum of the elastic force of the spring (20) and the spring force of the spring built in the switch (27). The operating rod (28) is pushed in, the switch (27) is turned on, and the solenoid (36a) of the solenoid valve (36) continues to be excited. In this state, when the driver releases the pedal force on the brake pedal (32), the brake fluid from the wheel cylinders of the rear wheels (34a) (34b) is transferred to the master cylinder (3
Although it returns to 1), since the solenoid valve (36) is in the shut-off state, the brake fluid does not flow back from the wheel cylinders of the front wheels (38a) (38b), and the pressure fluid is retained therein. This allows the car to remain stationary on the slope. In addition, in FIG. 4, the gap S is closed, and the back torque is reduced by the caliper.
Although it can be received by (1), since the switch action point is below this, it can be surely turned on by receiving a large stroke by the lever principle.

To start the vehicle, switch the gears and put the clutch pedal in the half-clutch state, and depress the accelerator pedal to open the accelerator switch (72), and the driving force is transmitted to the disc rotor (10) of the front wheel (38b). , This and pad board
The frictional force between (8) and (11) is reversed again, the brake reaction force is in the direction A, and the pad plates (8) and (11) are pushed to the left,
It assumes the position shown in FIG. That is, the switch (27) is turned off and the solenoid (36a) of the solenoid valve (36) is de-energized. The solenoid valve (36) takes the D position again and the master cylinder (3
The 1) side and the wheel cylinder side are connected. The pressure liquid held in the cylinder portion (2) flows back to the master cylinder (31) through the solenoid valve (36) in the illustrated state. Thus the brakes are released and the car starts.

In the above description, when the brake pedal (32) is depressed to further increase the braking force when stopped on an uphill road, the master cylinder side and the wheel cylinder side are communicated with each other through the check valve (73). As a result, the braking force can be further increased.

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

For example, in the above embodiments, the switch (27) is provided in the receiving portion (25) located below the support portion (18b) of the caliper (1) in the disc brake (80).
Although it is provided on the feeding side of (10), it may be provided on the feeding side. In this case, the switch (27) is turned off when the operating rod (28) is pushed in, but when the switch (27) is turned on, the solenoid valve (38) solenoid (48) is de-energized. The circuit configuration may be set as described above.

Further, in the above embodiment, one wire-shaped spring (20) is used to hold one pad, but this may be divided into a plurality of springs, for example, two springs. Further, instead of the wire-shaped spring, a plate-shaped appropriately bent spring may be used.

〔The invention's effect〕

As described above, according to the disc brake device of the present invention, the stopped state of the vehicle or the like can be maintained even if the clutch pedal is not kept depressed, and the pedal can be used even if a member such as the clutch plate is worn. The effect that the timing between the operation and the actual movement of the wheel or the vehicle body does not deviate can be obtained for the disc brake. Further, even if the pad is worn, there is no relative displacement with respect to the caliper, that is, the switch, and a countermeasure against this is unnecessary. Also,
By providing only one spring for the pad that is pressed against the disc rotor via the caliper, not only the rattling of the pad in the disc rotor circumferential direction but also the movement of the pad outward of the disc rotor diameter is regulated. Since rattling in the radial direction of the rotor is also suppressed, malfunction of the switch due to rattling in the circumferential direction of the pad and damage to the switch due to rattling in the radial direction of the pad can be prevented. Further, even if the movement of the pad toward the outer side of the disc rotor is restricted, since this is formed by a spring that is bridged between the support portions, the portion that engages the pad from the outer side to the support portion of the caliper. It is not necessary to form the disk rotor, and the pad can be easily exchanged from the radial outside through the pair of supporting portions by simply removing the spring.

[Brief description of drawings]

FIG. 1 is a front view of a disc brake in a disc brake device according to an embodiment of the present invention, FIG. 2 is a partially cutaway plan view thereof, FIG. 3 is a partially cutaway rear view thereof, and FIG. 4 is IV- in FIG. Sectional view taken along line IV, and FIG. 5 shows V in FIG.
6 is an enlarged sectional view taken along line -V, FIG. 6 is a piping system diagram showing the entire disc brake device, and FIG. 7 is a schematic side view of a wheel on a slope for showing the operation of the embodiment. In the figure, (1) ... caliper (8) (11) ... pad plate (18a), (18b) ... support part (20) (50) ... spring (27) ... switch

Claims (1)

[Claims] 1. A pair of pads arranged to sandwich a disc rotor, a caliper arranged to straddle the disc rotor and a pair of pads, and a guide for guiding movement of the caliper in the axial direction of the disc rotor. A device and a cylinder device which is provided on the caliper and is capable of directly pressing one pad of the pair of pads and pressing the other pad to the disk rotor via the caliper;
Between the pair of support portions provided on the caliper so as to transmit the acting force of the cylinder device to the other pad and guide the axial movement of the pair of pads, and between the pair of pads and the pair of support portions. In a disc brake device provided with a pair of springs for urging the pair of pads, a switch that operates by detecting a change in the action direction of the frictional force by movement of the pad is opposed to the other pad. Attached to the caliper, the pair of springs,
Both ends are respectively engaged with the pair of support portions and are installed so as to be engaged with the pair of pads at the central portion side, and among them, a spring provided for the other pad is used as the other pad. A disc brake device that engages the pair of support parts in different acting directions so as to urge the switch in the inoperative direction.