JPH0579852B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a torque sensing type disc brake in which brake torque, which is the output state of the brake, can be measured through rotational torque generated in a caliper.

[Background of the invention]

As is well known, a disc brake brakes the rotation of the rotor by pressing a friction pad against the rotating surface of the rotor in response to an input applied through a hydraulic or mechanical input means. Various types of brake torque have been resisted according to various design philosophies, such as directly receiving pressure from fixed parts of the vehicle (e.g., knuckles, supports, etc.) or indirectly receiving pressure via calipers, etc. There is.

In addition, in order to achieve safe braking of the vehicle, such braking equipment uses a proportioning valve that controls the distribution of brake force between the front and rear wheels, taking into account the load transfer during braking, and a proportioning valve that controls the distribution of braking force between the front and rear wheels, which takes into account load transfer during braking, and doubles the number of times the brake pedal is pressed. They are also used in combination with various types of equipment, such as boosters that apply force or anti-lock devices that prevent wheels from locking on frozen roads.

By the way, when controlling the brake device from the above-mentioned viewpoint, for example, each brake device applied to each of the four wheels of the vehicle (front and rear wheels,
In order to appropriately control the mutual relationship between the left and right wheels for safe braking of the vehicle, or for wheel anti-lock control, the concept of so-called feedback control is introduced to detect the output state of each brake device. It is desired to configure a feedback control system that feeds back information to the input control equipment for each brake device, but in reality, even if there is a system that detects the wheel rotation state, it is difficult to control the output of the brake device. No direct detection control system has been found. This is mainly due to the problem that it is difficult to create a configuration that measures and detects the output of the brake device as a physical quantity with high reproducibility.

[Purpose of the invention]

The present invention has been made in view of the above, and an object thereof is to provide a torque sensing type disc brake having a structure suitable for measuring and detecting the output of a brake device as a highly reproducible physical quantity. .

Another object of the present invention is to provide a torque-sensing disc brake for a vehicle that is suitable for controlling mutual braking force states of various types of vehicles in a relational manner.

Another object of the present invention is to provide a torque sensing disc brake for a vehicle suitable for wheel antilock control.

[Summary of the invention]

The torque sensing type disc brake according to the present invention, which has been made to achieve such an object, is characterized by: a rotor; a pair of friction pads disposed on both sides of a portion of the rotor so as to be frictionally engaged;
A fixed support is fixedly disposed near an edge of a part of the rotor, and the fixed support supports the rotor so as to be movable in the axial direction via a sliding support device. In a disc brake equipped with a caliper member that is frictionally engaged with the caliper, the sliding support device is a slide member that is restricted from rotating around an axis with respect to the caliper, but is allowed to rotate around an axis with respect to a fixed support. A torque arm is provided so that the support is provided via a pin, and when the slide pin rotates around an axis integrally with the slide pin, a torque detection sensor is inserted between the torque arm and the fixed support and is pressed by these. It is in the structure of what you want to do.

For example, a load cell is used as the torque detection sensor, and the brake torque generated in the disc brake can be calculated by measuring voltage changes in a torque detection circuit connected to the load cell.

[Embodiment of the Invention] The present invention will be further described below based on an embodiment shown in the drawings.

Figure 1 is a front view of the disc brake, Figure 1 is a cross-sectional plan view taken along line A-A in Figure 1, Figure 3 is a sectional view taken along line B-B in Figure 1, and Figure 4 is a cross-sectional view of Figure 3. C-C
A line sectional view and FIG. 5 are diagrams showing a perspective appearance of this embodiment.

In these figures, 1 is a rotor, and 2 is a fixed support (hereinafter referred to as support), which is fixed to a knuckle by tightening a mounting bolt (not shown) through a mounting hole 3 on one side of the rotor.

The support 2 is on one side of the rotor (inner side)
, a pair of radial arms 4 relative to the rotor;
4, and a circumferential arm 5 located radially outward of the rotor, which is formed to have a rectangular opening, and
Extended to the outer side of the rotor by a pair of generatrix arms 6, 6 spaced apart in the rotor circumferential direction that cross the rotor's edge radially outward position, and the extending tips of these generatrix arms 6, 6. Connecting arm 7 that connects them together,
7 and a slide pin support arm 8 extending from an intermediate portion of these connecting arms 7, 7 to a position radially outward of the rotor.

Reference numerals 9 and 10 denote torque arm opposing protrusions that are formed protrudingly on the opposite side of the rotor of the pair of radial arms 4 and 4 of the support 2, and the upper ends (radially outer side end surfaces) of these protrusions include: A load cell fitting hole 11 and a backlash prevention piece fitting hole 12 are each formed as openings. In this example, the load cell fitting hole 11 is connected to the radial arm on the rotational entry side of the rotor 1 so as to receive the acting rotational torque of the caliper determined by the rotational direction of the rotor 1 shown in the figure (when the vehicle moves forward). 4
(on the left side of FIG. 1).

13 is a caliper, which straddles the edge of the rotor 1 and has an inner leg 14 having a cylinder 19 housing a pad pressing piston 24 on the inner side;
The outer side has bifurcated outer legs 15, 15 forming reaction claws, and a rotor edge straddling seat 20.
In the circumferential center of the rotor, there is a spline hole 2 into which a slide pin of a sliding support device 26 (to be described later) is fitted.
1 is formed.

The caliper 13 has a pair of protrusions 16, 16 on both sides of the inner leg 14 in the rotor circumferential direction, and the rotor circumferential protrusions 16, 16 and the outer leg 1
5 and 15 each have a pair of pad support pin fitting holes 1.
7, 17, 18, 18 are provided, and through pad support pins 42, 43 press-fitted into these fitting holes,
An inner side friction pad (hereinafter referred to as an inner pad) 22 and an outer side friction pad (hereinafter referred to as an outer pad) 23 are attached and supported.

25 is an oil chamber that operates the hydraulic piston 24 to press the inner pad 22 against the rotor 1.
Further, the caliper 13 is supported via a sliding support device 26 so as to be movable in the rotor axial direction. In the sliding support device 26 of this example, a slide pin 27 is constructed so as to extend in the rotor axial direction between the circumferential arm 5, which is the inner side portion of the support 2, and the slide pin support arm 8, which is the outer side portion. The circular shaft parts 33 and 34 on both ends are slidably fitted to each part of the support so as to be rotatable around the axis, and the head part 27 and the small diameter tip part 31 of the pin are fitted to the support 2. washer 37 to prevent it from falling off,
The C-clip 38 substantially restricts axial movement, and furthermore, the spline shaft portion 2 at the center of the shaft
7 is slidably fitted into the slide pin sliding spline hole 21 of the caliper 13 to form a support structure which allows relative movement in the axial direction and restricts rotation around the axis.

Such a sliding support device 26 allows the caliper 13 to move in the rotor axial direction, so when the inner pad 22 is brought into pressure contact with the rotor 1 by the hydraulic piston 24, the caliper 13 is moved by the reaction force.
moves to the inner side, and therefore the outer leg 15
causes the outer pad 23 to come into pressure contact with the rotor, thereby braking the rotor 1.

At this time, the caliper 13 has a pair of friction pads 2.
Pressure force F ₁ to the rotor 1 of 2 and 23 (see Fig. 2),
From the relationship of the distance L ₁ (see Fig. 1) between the center of pressure welding and the sliding support point of the caliper 13 (the axis of the slide pin 27), in the counterclockwise direction in Fig. 1, T ₁ = 2 μF ₁ × L ₁ ... ...(1) (where μ is the coefficient of friction between the pad and the rotor) A rotational torque T ₁ is generated, and this rotational torque is directly transmitted to the slide pin 27 via the spline sliding portion.

In this example, the rotational torque of the slide pin 27 is transmitted to the torque arm 35 that is substantially integrated with the slide pin 27 by fitting the square shaft portion 30 of the slide pin and the square shaft fitting hole 36, The swinging tip of the torque arm 35 is connected to the load cell 39 fitted into the load cell fitting hole 11 of the support.
, and the rotational torque generated in the caliper 13 during braking is detected as pressure acting on the load cell 39.
Here, the force F ₂ acting on the load cell 39 is
From equation (1), it is given by equation (2) below.

F ₂ = T ₁ /L ₂ ...(2) (However, L ₂ is the distance from the swing center of the torque arm 35 to the load cell engagement part.) Furthermore, on the arm part on the opposite side of the torque arm 35,
It is engaged with a rattling prevention piece 40 fitted into the rattling prevention piece fitting hole 12 of the support 2, and the spring force of a rattling prevention spring 41 prevents rattling when the caliper is not braking.

According to the above configuration, the brake torque generated by the brake operation is transmitted to the caliper 13,
The pressure is transmitted to the load cell 39 via the slide pin 27 and the torque arm 35, and the magnitude of the brake torque can be detected from the voltage change occurring in the load cell by a pressure detection circuit (not shown) connected to the load cell 39. become.

Note that the present invention is not limited to the above embodiments, and the sliding support device may be configured to seal and protect the sliding portion from the outside with a suitable boot or the like, or the sliding support device may be configured to seal and protect the sliding portion from the outside with a suitable boot or the like. Brake torque may also be detected.

Furthermore, various changes can be made, such as allowing the support to absorb part of the brake torque generated on the friction pad, or setting the load cell's pressure limit so that the support receives the brake torque when the rotational torque exceeds a certain value. This embodiment may also be adopted.

〔Effect of the invention〕

As described above, the torque sensing type disc brake according to the present invention is capable of suitably realizing brake torque detection that has not been seen before, and is highly useful.

[Brief explanation of the drawing]

Figure 1 is a front view of the disc brake, Figure 2 is a cross-sectional plan view taken along line A-A in Figure 1, Figure 3 is a sectional view taken along line B-B in Figure 1, and Figure 4 is Figure 3. C-C
5 is a perspective view of the disc brake of this embodiment. 1: Rotor, 2: Support, 3: Mounting hole, 4:
Radial arm, 5: Circumferential arm, 6: Generator arm, 7:
Connecting arm, 8: Slide pin support arm, 9, 10: Torque arm opposing protrusion, 11: Load cell fitting hole, 1
2: Backlash stopper fitting hole, 13: Caliper, 14: Inner leg, 15: Outer leg, 16: Rotor circumferential projection, 17, 18: Pad support pin fitting hole, 1
9: Cylinder, 20: Rotor edge straddle portion, 21: Slide pin sliding spline hole, 22: Inner pad, 23: Outer pad, 22a, 23a:
Pad support pin fitting hole, 24: Pad pressing piston, 25: Oil chamber, 26: Sliding support device, 27: Slide pin, 28: Head, 29: Spline shaft, 30: Square shaft, 31: Small diameter tip Part, 33, 3
4: Circular shaft portion, 35: Torque arm, 36: Square shaft fitting hole, 37: Washer, 38: C-clip,
39: Load cell, 40: Backlash prevention piece, 41: Backlash prevention spring, 42, 43: Pad support pin.

Claims (1)

[Claims] 1 A rotor, a pair of friction pads arranged so as to be frictionally engaged on both sides of a part of the rotor, a fixed support fixedly arranged near an edge of the part of the rotor, and the fixed support. In the disc brake, the disc brake includes a caliper member that is movably supported in the axial direction of the rotor via a sliding support device and that frictionally engages the pair of friction pads with the rotor, the sliding support device being configured to A torque arm is provided to support the fixed support via a slide pin that is restricted from rotating around the axis, but is allowed to rotate around the axis, and rotates around the axis integrally with the slide pin. A torque sensing type disc brake, characterized in that a torque detection sensor is inserted between the torque arm and the fixed support and is pressed by the torque arm and the fixed support.