JPS6275142A - Torque sensing type disc brake - Google Patents

Abstract

PURPOSE:To calculate brake torque produced in a disc brake by using a load cell, and measuring a voltage change in a torque detection circuit. CONSTITUTION:The opposite arm portion of a torque arm 35 is engaged with a play stop piece 40 fitted in a play stop fitting hole 12 of a support 2. Brake torque produced by brake operation is transmitted as pressure to a load cell 29 through calipers 13, a slide pin 27, and a torque arm 35. Accordingly, the magnitude of brake torque can be detected from a voltage change caused in the load cell by a pressure detecting circuit connected to the load cell 39.

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 is capable of increasing friction/4 by inputting it through a hydraulic or mechanical input means.
The rotor's rotation is braked by pressing the pad against the rotor's rotating surface, and the braking torque applied to the friction pad is directly received by fixed parts of the vehicle (e.g. knuckles, satates, etc.) or by the carrier. Various types have been provided according to various design ideas, such as receiving pressure indirectly through a 9 or the like.

In addition, in order to realize safe braking of a vehicle, such a brake device controls the distribution of brake force between the front and rear wheels, taking into account the load transfer during braking, for example. -PJfL^ It is also used in organic combination with various devices, such as a Gooster that boosts the power output, and an anti-lock device that prevents wheels from locking on frozen roads.

By the way, when controlling the brake device from the above-mentioned viewpoint, for example, the mutual relationship of each brake device applied to each of the four wheels of the vehicle (front and rear wheels, or left and right wheels) must be checked for safe braking of the vehicle. In order to suitably control
Alternatively, for wheel anti-lock control, a so-called feedback control concept can be introduced to configure a feedback control system that detects the output state of each brake device and feeds back information to the input control device for each brake device. However, in reality, although there are systems that detect the rotational state of the wheels, there are no control systems that directly detect the output of the brake system. 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 type disc brake for a vehicle that is suitable for controlling the mutual braking force state of each wheel of the vehicle in a relational manner.

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

[Summary of the invention]

The torque-sensing disc brake of the present invention, which was made to achieve this purpose, is characterized by a rotor and a pair of friction brakes disposed on both sides of a portion of the rotor so as to be able to engage with each other through friction. and fixedly arranged near the edge of a part of the rotor Ij! , -a fixed support, and a caliper member supported by the fixed support so as to be movable in the axial direction of the rotor via a sliding support device, and for frictionally engaging the pair of friction pads with the rotor. In the disc brake, the sliding support device is provided with a slide pin that is rotatable about an axis in the rotor axial direction with respect to the fixed support and is restrained from rotating around the same axis with respect to the caliper. Further, the slide pin and the fixed support are directly or indirectly mechanically engaged via a torque detection sensor that is compressed by rotational torque about the axis of the slide pin.

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

[Embodiments of the invention]

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

Fig. 1 is a plan view taken along line A-A, Fig. 3 is a sectional view taken along line B-B in Fig. 1, Fig. 4 is a sectional view taken along line C-C in Fig. 3, and Fig. 5 is a sectional view taken along line C-C in Fig. 1. FIG. 2 is a diagram showing a perspective appearance.

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

The above case/-) 2 is formed to have a rectangular opening on one side (inner side) of the rotor by a pair of radial arms 4° 4 relative to the rotor and a circumferential arm 5 at a position radially outward of the rotor. and is extended to the outer side of the rotor by a pair of generatrix direction arms 6, 6 spaced apart in the direction of the rotor station that crosses the radially outward position of the edge of the rotor, and these generatrix direction arms 6, 6 The slide pin support arm 8 extends from the intermediate portion of the connecting arms 7, 7 to a position radially outward of the rotor.

Q. 10ir 10d? - 9σ) Self-propelled penetration P-φ θ) Diameter d1 4.40 This is a torque arm facing protrusion formed protrudingly on the side opposite to the rotor, and the upper end (radially outer end face) of these is a protrusion facing the torque arm. , a load cell fitting hole 11, and a play prevention piece fitting hole 12 are each formed as openings. In this example, the load cell fitting hole 11 is formed in a radial arm on the rotational input side of the rotor 1 so as to receive the operating torque of the caliper determined by the rotational direction of the rotor 1 shown in the figure (when the vehicle moves forward). 4 (left side in Figure 1).

Reference numeral 13 denotes a caliper, which straddles the edge of the rotor 1 and has an inner leg 14 having a cylinder 19 containing a pad suppression piston 24 on the inner side, and a bifurcated caliper forming a reaction claw on the outer side. It has an outer leg 15.15, and a spline hole 21 is formed in the center of the rotor edge straddle portion 20 in the circumferential direction of the rotor, into which a slide pin of a sliding support device 26 (to be described later) is slidably fitted.

The caliper 13 has a pair of protrusions 16, 16 on both sides of the inner leg 14 in the rotor circumferential direction, and a pair of pad support pins are fitted into the rotor circumferential protrusions 16, 16 and the outer leg 15. Fitting holes 17°17, 18, 18 are provided, and pad support pins 42, 43 are 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 via.

25 operates the hydraulic piston 24 to remove the inner pad 2.
2 is an oil chamber that presses the rotor 1 into contact with the rotor 1.

Further, the carrier -e 13 is supported via a sliding support device 26 so as to be movable in the rotor axial direction. The sliding support device 26 of this example has a slide pin 27 installed between the circumferential arm 5, which is the inner side portion of the support 2, and the slide pin support arm 80, which is the outer side portion, so as to extend in the rotor axial direction. , the circular shaft portions 33 and 34 on both ends are slidably fitted to each part of the support so as to be rotatable about the axis, and the head portion 27 of the pin and the small diameter tip portion 31 are fitted to the support 2. Washer 37, C for preventing removal
- Movement in the axial direction is substantially restrained by Chryso f3B, and relative movement in the axial direction is possible by sliding the sedge line shaft portion 27 at the center of the shaft into the sliding spline hole 21 of the caliper 13. It has a support structure that is large and restricts the rotation of the shaft.

Such a sliding support device 26 allows the caliper 13 to move in the axial direction of the rotor, so when the inner/outer pad 22 is brought into pressure contact with the rotor 1 by the hydraulic piston 24,
The reaction force causes the carrier/4'13 to move toward the inner side, so that the outer leg 15 presses the outer pad 23 against the rotor, thereby braking the rotor 1.

At this time, the caliper 13 has a pair of friction pads 22 and 23.
Pressing force F1 (see Fig. 2) on the rotor 1 of
From the relationship of the distance L1 (see Figure 1) with the axis of
In the counterclockwise direction of the figure, TI = 2 μF, xL, 1 (1) (
However, μ is the coefficient of friction between the pad and the rotor), which results in a rotational torque of 1, and this rotational torque is the rotational torque of the slide pin 27 at the spline sliding portion, and in this example, the rotational torque of the slide pin 27. The slide pin 27 is fitted with 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 engaged with the load cell 39 fitted in the load cell fitting hole 11 of the support. The rotational torque during braking is detected as the pressure acting on the load cell 39.

Here, the force F2 acting on the load cell 39 is as described in (1) above.
From the equation, it is given by the following equation (2).

Fz = TI/Lx (2) Note that support 2 is attached to the arm on the opposite side of the torque arm 35.
The caliper is engaged with a rattling prevention piece 40 fitted into the rattling prevention piece fitting hole 12, and the spring force of a rattling prevention spring 41 prevents the caliper from rattling when the brake is not applied.

The brake torque generated by Kya IJ/$131 slide bin 27. The pressure is transmitted to the load cell 39 via the torque arm 35, and a pressure detection circuit (not shown) connected to the load cell 39 can detect the magnitude of the brake torque from the voltage change occurring in the load cell.

Note that the present invention is not limited to the above-described embodiments, and the sliding support device may be configured such that the sliding portion is sealed and protected 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, 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.

Yet again, friction! Various modified modes have been adopted, such as partially absorbing the brake torque generated in the shaft with the support, or setting the pressure limit of the load cell and having the support receive the brake torque when the rotational torque exceeds a certain value. Pick something you can do.

〔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 drawings]

Figure 1 is a front view of the disc brake, Figure 2 is Figure 1A
- A plan view taken along line A, Figure 3 is B-B in Figure 1.
4 is a sectional view taken along the line CC in FIG. 3, and FIG. 5 is a perspective view of the disc brake of this embodiment. 1: Rotor 2: Support 3: Mounting hole
4: Radial direction arm 5: Circumferential direction arm 6: Generator direction arm 7: Connecting arm 8 Ni Ride bin support arm 9. 10: ) Luc arm opposing protrusion 11: Load cell fitting hole 12: Stop piece fitting hole 13 : Kya IJ /4'14:
Inner leg 15: Outer leg 16: Rotor circumferential protrusion 17. 18: Nogurado support pin/fitting hole 19 Nijilinda 20: Rotor line seat 21 Ni slide pin sliding fit sedge line hole 22: Inner pad 23: Outer pad 22 a
+ 23 a: Noyado support bottle fitting hole 24: Pad suppression piston 25; Oil chamber 26 Two sliding support devices 27: Slide pin 28 Two heads 29 Splined shaft portion 30: Square shaft portion 31: Small diameter tip portion 33, 34 :Circular shaft part 35:
Torque arm 36: Square shaft fitting hole 37: Washer
3820-Clip 39: Load cell 40:
Backlash stopper piece 41; Backlash stopper spring 42143:/'' Rad support pin. Figure 2 Figure 3 Figure 4

Claims (1)

[Claims] a rotor; a pair of friction pads frictionally engageably disposed on opposite sides of a portion of the rotor; a fixed support fixedly disposed near an edge of the portion of the rotor; 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 caliper is provided with a slide pin that is rotatable around an axis in the rotor axial direction relative to the caliper and restrained from rotating about the same axis relative to the caliper, and further between the slide pin and the fixed support, A torque sensing type disc brake, characterized in that it is mechanically engaged directly or indirectly via a torque detection sensor that is compressed by rotational torque around the axis of a slide pin.