JPH0767907B2 - Torque sensing type disk brake - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a torque sensing type disc brake capable of measuring a brake torque, which is an output state of a brake, based on a rotational torque generated in a caliper. .

[Conventional technology]

As is well known, the disc brake is a brake for rotating the rotor by bringing the friction pad into pressure contact with the rotating surface of the rotor by an input given through a hydraulic or mechanical input means. Various types of brake torque have been provided in accordance with various design concepts such as that the fixed portion of the vehicle (for example, knuckle, support, etc.) directly receives the pressure, or indirectly through a caliper or the like. There is.

In order to realize safe braking of the vehicle, such a braking device is, for example, a proportioning valve that controls distribution of front and rear wheel braking forces in consideration of load movement at the time of braking, and stepping on the brake pedal is doubled. It is used by being organically combined with various devices such as an applied booster or an anti-lock device for preventing wheel lock on a frozen road surface.

By the way, when controlling the brake device from the above viewpoint, for example, the mutual relationship of each brake device (front / rear wheel, or left / right wheel) applied to each of the four wheels of the vehicle is used for safe braking of the vehicle. To control the
Alternatively, for wheel anti-lock control, the concept of so-called feedback control should be introduced to configure a feedback control system that detects the output state of each braking device and feeds back information to the input control device to each braking device. Is desired.

A brake device described in, for example, Japanese Patent Publication No. 50-18547 is known as a structure capable of directly detecting the output state of such a brake device.

[Problems to be Solved by the Invention]

However, the brake device described in Japanese Patent Publication No. 50-18547 has a configuration in which a load meter is directly applied to the pad back plate, which is easily heated to high temperature due to frictional heat during braking. There is also a problem that the number of sensors increases because there is a problem that it is greatly affected and a sensor is required for each friction pad to detect the brake torque generated in the friction pads located on both sides of the rotor. is there.

The present invention has been made in view of the above point, and an object thereof is a structure suitable for measuring and detecting the output of a brake device as a physical quantity with high reproducibility, that is, the friction pad becomes high temperature due to frictional heat during braking. It is an object of the present invention to provide a torque-sensing disc brake that has a structure that is not affected by the property of being easy and that requires a small number of sensors for detecting brake torque.

Another object of the present invention is to provide a torque-sensing disk brake for a vehicle, which is suitable for controlling the mutual braking force state of each wheel of the vehicle.

Another object of the present invention is to provide a torque-sensing disk brake for a vehicle suitable for wheel anti-lock control.

[Means for Solving the Problems]

The torque sensing type disk brake according to the present invention made to achieve the above object is characterized by a rotor and a pair of opposed friction pads arranged so as to be frictionally engageable with both side surfaces of a part of the rotor. And a fixed support fixedly disposed in the vicinity of the part of the rotor and the opposing pair of friction pads on both side surfaces of the rotor by friction, and at the time of the friction engagement, the pair of friction pads A disc brake comprising: a hydraulic cylinder device that supports the pair of friction pads so as to receive the generated brake torque, wherein the fixed support member is arranged in an inner position of a rotor diameter in a rotor axial direction. The hydraulic cylinder device, which supports the hydraulic cylinder device so as to be swingable in the circumferential direction of the rotor via a shaft, and which supports the pair of friction pads so as to receive brake torque. Stoppers are provided on both sides of the fixed support in the circumferential direction of the rotor so as to engage with the binder device to lock the swing thereof, and a sensor for detecting the engagement pressing force of the hydraulic cylinder device is provided on the stopper part. Where it is.

[Action]

According to the present invention having the above-described structure, the hydraulic cylinder device is arranged so as not to come into direct contact with the friction pads that are apt to become hot due to frictional heat during braking, and that supports the friction pads on both sides of the rotor. Therefore, the brake torque generated in the brake device can be directly detected with a small number of sensors.

〔Example〕

The present invention will be further described below based on an embodiment shown in the drawings.

Fig. 1 is the front view of the disc brake, and Fig. 2 is Fig. 1A-.
The cross section taken along the line A is shown, and the disc brakes shown in these figures are of the so-called exposed type.

In these figures, 1 is a rotor, and 2 is a fixed support formed as a part of a knuckle or the like for supporting a wheel. In the present example, a rotary support shaft 8 to be described later is provided at an inward position on one side of the rotor 1. Has a hole 2a into which
Stopper portions 2b, 2b extending to both sides of the rotor portion 2a in the circumferential direction are provided as a pair of arm portions.

Reference numeral 3 denotes a hydraulic cylinder device, which has a pair of legs 3a and 3b straddling the edge of the rotor 1, and hydraulic pistons 4a and 4b are slidably fitted to the cylinders of these legs, respectively. The friction pads 6a and 6b on both sides of the rotor 1 are brought into pressure contact with the rotor 1 by the brake hydraulic pressure transmitted to the hydraulic chambers 5a and 5b. The friction pads 6a and 6b are supported on the body of the hydraulic cylinder device 3 by the pad support pins 7.
It is movable in the rotor axis direction.

In addition, the hydraulic cylinder device 3 has a bifurcated support for holding the portion of the fixed support 2 where the hole 2a is formed from the inner side edge of the rotor diameter of one leg 3b. Extension 3
c, 3c are provided, and the extending portions 3c, 3c are formed with a fitting hole 3e and a screw hole 3d that face the hole 2a of the fixed support member 2 with their axes aligned, The rotary support shaft 8 is fitted into these holes 2a, 3d, 3e as shown in the figure, and is firmly fastened by screwing the shaft head portion 8a and the screw hole 3d of the tip screw portion 8b. Is rotatably supported on the fixed support 2 around the shaft 8.

In this example, the stopper portion 2 of the fixed support 2 is further added.
Screw the load cell fixing support bolts 9 and 9 to b and 2b,
Thereby, the load cells 10, 10 are fixedly supported so as to be engaged with the facing surfaces 3f, 3f of the hydraulic cylinder device 3. Reference numeral 11 is a lead wire for outputting an electric signal from these load cells 10, 10 to an electronic control circuit (not shown).

In the disk brake configured as described above, when the pair of friction pads 6a and 6b are frictionally pressed against the rotor 1 by the brake operation, the brake torque acting on the friction pads causes the fixed support body 3 to rotate in the rotor rotation direction. A rotational moment about the axis 8 is generated according to The rotational moment M generated in the fixed support 3 can be obtained by the force F acting on the load cell 10 (the right side load cell in FIG. 1) from the relation of M = F · l as shown in FIG. Therefore, the amount of change in the electrical signal generated in the load cell 10 is detected by the electronic control circuit (not shown), and the output state of the brake is obtained.

The obtained signal is used as other information, for example, the value of the brake hydraulic pressure that is an input, and is used as information that constitutes a feedback system that allows a predetermined braking force to be generated regardless of the loaded state of the vehicle. It may be used according to an appropriate purpose, and a circuit configuration therefor can be realized by a known circuit technique.

The present invention is not limited to the above embodiments,
For example, for the purpose of detecting the brake torque only when the vehicle is moving forward, one of the load cells on both sides in FIG. 1 (the side that is pressed when the vehicle is moving backward) may be omitted, or the pressing force above a certain level. In order to prevent the load cell from acting on the load cell, a deformation limit of the load cell may be set.

[Effects of the Invention] As described above, the torque sensing type disc brake of the present invention extracts the magnitude of the brake torque acting on the hydraulic cylinder device during braking as an electrical signal by a transformer such as a load cell, and if necessary, It can be used as an input signal of a target control system, and its accuracy is high in correspondence with the brake torque of the signal taken out as a detection signal of the brake torque, and the reproducibility of repetition is also high. Is great.

Further, according to the configuration of the present invention, the brake torque can be detected by the sensor provided on the fixed portion that supports the friction pads on both sides of the rotor and engages and locks the hydraulic cylinder device that swings during braking. In addition, the friction pad, which is apt to be heated to a high temperature during braking, does not come into direct contact with the sensor, and the detection error due to the influence of the high temperature is small, and the number of required sensors is small.

[Brief description of drawings]

Fig. 1 is a front view of the disc brake, and Fig. 2 is Fig. 1A.
FIG. 6 is a vertical cross-sectional view of a section taken along the line A. 1 ... Rotor, 2 ... Fixed support 2b ... Stopper part, 3 ... Hydraulic cylinder device 3a, 3b ... Leg part, 3c ... Support extension part 3d ... Screw hole, 3e ... Hole 3f ...... Opposing surface, 4a, 4b ...... Hydraulic piston 5a, 5b ...... Hydraulic chamber, 6a, 6b ...... Friction pad 7 ...... Pad support pin, 8 ...... Rotation support shaft 9 ...... Load cell fixing bolt, 10 ...... Load cell 11 ... Lead wire.

Claims (1)

[Claims] 1. A rotor, a pair of opposing friction pads arranged on both side surfaces of a part of the rotor so as to be frictionally engageable, and a fixed support body fixedly arranged in the vicinity of the part of the rotor. And a hydraulic cylinder device that frictionally engages the pair of opposed friction pads with both side surfaces of the rotor and supports the pair of friction pads so as to receive the brake torque generated in the pair of friction pads during the friction engagement. And a fixed support member that supports the hydraulic cylinder device so as to be swingable in the rotor circumferential direction via a shaft that is disposed inward of the rotor diameter and that forms the rotor axial direction. At the same time, stopper portions that engage with the hydraulic cylinder device that supports the pair of friction pads so as to receive brake torque and lock the swing thereof are provided on both sides of the fixed support in the circumferential direction of the rotor. Further torque-sensing type disc brake, characterized in that a sensor for detecting the engagement pressure of the hydraulic cylinder device to the stopper portion.