JP2004092770A - Disc brake - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To accurately detect braking torque without influence of a moment generated in a carrier during braking in a disc brake. <P>SOLUTION: In back parts of pad receiving parts 8A and 8B of the carrier 2, a supporting part 11A is extended along an axial direction center of an outer circumference of a disc rotor 9 and it is coupled with an attaching part 13. A displacement sensor 20 is attached to a tip of a braking torque detecting arm 3 fixed to the attaching part 13, and a detector is abutted on the supporting part 11A. Brake pads are pressed against the pad receiving parts 8A and 8B by the braking torque, the carrier 2 is slightly elastically deformed, and the supporting part 11A is displaced. Since a displacement amount of the supporting part 11A is proportional to the braking torque, the braking torque can be obtained by detecting displacement of the supporting part 11A by the displacement sensor 20. Since the supporting part 11A is arranged in the axial direction center of the outer circumference of the disc rotor 1, accurate braking torque can be detected without the influence of the moment generated in the carrier 2. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
[Industrial applications]
The present invention relates to a disc brake capable of directly detecting a braking torque.
[0002]
[Prior art]
Currently, in a brake system of an automobile or the like, various kinds of sensors are used to detect a vehicle state such as a rotation speed of each wheel, a vehicle speed, a vehicle acceleration, a steering angle, a vehicle lateral acceleration, a braking torque of each wheel, and the like. The anti-lock control, the traction control, the vehicle stabilization control, and the like can be performed by controlling the braking force of each wheel based on the detection of.
[0003]
Conventionally, when detecting the braking torque of each wheel, in the case of a hydraulic brake system, the braking torque is indirectly calculated based on the friction coefficient of the brake pad from the hydraulic pressure acting on the brake device of each wheel detected by the pressure sensor. Is calculated.
[0004]
However, since the friction coefficient of the brake pad greatly changes depending on the temperature or the like, it is difficult to accurately calculate the actual braking torque, and it cannot be said that optimal control is always performed.
[0005]
In order to accurately detect the braking torque of each wheel, various means have been proposed for directly detecting the actual braking torque. For example, Patent Literatures 1 and 2 disclose a technique in which a distortion sensor is attached to a knuckle that supports a carrier of a disc brake, and a braking torque is detected from distortion of a knuckle carrier attachment portion generated during braking.
[0006]
Patent Literature 3 discloses a technique in which a strain sensor is attached to a strain generating portion provided on a carrier of a disc brake, and a braking torque is detected from strain generated in the carrier during braking.
[0007]
Patent Literature 4 discloses a technique in which a load sensor is attached to a portion of a carrier of a disc brake that receives a braking torque from a brake pad, and the braking torque acting on the brake pad during braking is directly detected.
[0008]
Further, Patent Document 5 discloses a technique in which a carrier of a disc brake is rotatably supported by a shaft, a load sensor is attached to a stopper for restricting the rotation of the carrier, and a braking torque acting on the carrier during braking is directly detected. Is disclosed.
[0009]
[Patent Document 1]
European Patent No. 1176324 [Patent Document 2]
Japanese Patent No. 2736392 [Patent Document 3]
International Patent Publication No. 01/44676 Pamphlet [Patent Document 4]
Japanese Patent Publication No. 50-18547 [Patent Document 5]
Japanese Patent Publication No. 7-67907
[Problems to be solved by the invention]
However, the techniques described in the above-mentioned conventional patent documents have the following problems. In each of Patent Documents 1, 2, and 3, the distortion detecting unit is offset from the center of the disk rotor that generates the braking torque, and is asymmetric with respect to the axial center plane of the disk rotor. Therefore, it is difficult to accurately detect the braking torque due to the influence of the moment generated on the carrier by the braking torque. In the device described in Patent Document 4, since the load of the brake pad is directly received by the load sensor, the strength and heat resistance of the load sensor become problems. Further, in the structure described in Patent Document 5, the strength of the shaft directly receiving the load from the carrier and the load sensor becomes a problem.
[0011]
The present invention has been made in view of the above points, and an object of the present invention is to provide a disc brake capable of reducing the influence of a moment generated on a carrier and improving detection accuracy of a braking torque.
[0012]
[Means for Solving the Problems]
In order to solve the above-mentioned problem, the invention according to claim 1 includes a brake pad disposed on both sides of a disk rotor, a carrier supporting the brake pad and fixed to a non-rotating portion, A disc brake including a caliper for pressing a pad against the disc rotor,
A pad receiving portion for receiving a braking torque from the brake pad of the carrier is supported by a supporting portion disposed at an axial center of an outer periphery of the disk rotor, and a detecting means for detecting displacement or distortion of the supporting portion is provided. Features.
With such a configuration, displacement or distortion occurs in the support portion in accordance with the braking torque, and the braking torque can be directly obtained by detecting the displacement or distortion by the detecting unit. At this time, since the support portion is arranged at the axial center of the outer periphery of the disk rotor, the braking torque can be detected without being affected by the moment generated in the carrier.
According to a second aspect of the present invention, in the configuration of the first aspect, the support portion extends from a back portion of the pad receiving portion along an outer periphery of the disk rotor, and is attached to a non-rotating portion of the carrier. Characterized by being connected to
With this configuration, the braking torque applied to the pad receiving portion is transmitted to the mounting portion on the non-rotating portion of the carrier via the supporting portion.
According to a third aspect of the present invention, in the configuration of the first or second aspect, the detection means is a displacement sensor fixed to the non-rotating portion to detect a displacement of the support portion.
With this configuration, the braking torque can be obtained by detecting the displacement generated in the support portion during braking by the displacement sensor.
According to a fourth aspect of the present invention, in the configuration of the first or second aspect, the detecting means is a distortion sensor provided on the support portion and detecting distortion of the support portion.
With this configuration, it is possible to obtain a braking torque by detecting distortion generated in the support portion during braking by the distortion sensor.
[0013]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
A first embodiment of the present invention will be described with reference to FIGS. The disk brake according to the present embodiment is a caliper floating type disk brake, and FIGS. 1 to 4 show only the disk rotor 1, the carrier 2, and the braking torque detecting arms 3 and 4, which are main parts thereof.
[0014]
The disk rotor 1 has a hat shape in which a hub mounting portion 6 to which a hub (not shown) of an axle is connected protrudes from one side of a rotor portion 5 having a friction surface. The disk rotor 1 is of a ventilated type, and a plurality of ventilation holes 7 are radially provided in the rotor section 5.
[0015]
The carrier 2 has a pair of pad support portions 8 and 9 that straddle the outer peripheral portion of the rotor portion 5 of the disk rotor 1. The pad support portions 8 and 9 have pad receiving portions 8A and 9A with which both ends of an outer brake pad (not shown) arranged outside the rotor portion 5 of the disk rotor 1 (on the hub mounting portion 6 side) are in contact. Pad receiving portions 8B, 9B are formed to contact both ends of an inner brake pad (not shown) arranged inside the rotor portion 2 (on the opposite side of the hub mounting portion 6), and the pad receiving portions 8A, 8B are formed. , 9A, 9B are formed with rectangular grooves 8C, 8D, 9C, 9D for guiding the outer and inner brake pads slidably along the axial direction of the disk rotor 1.
[0016]
The pad support portions 8, 9 are connected to each other by an attachment portion 13 arranged inside the disk rotor 1 via arm portions 11, 12 extending from the back portions of the pad receiving portions 8A, 8B, 9A, 9B. ing. The arm portions 11 and 12 are arcuately extended from the backs of the pad receiving portions 8A, 8B, 9A and 9B of the pad supporting portions 8 and 9 along the axial center of the outer periphery of the disk rotor 1, respectively. 12A, and further bent toward the inside of the disk rotor 1, extended substantially along the radial direction of the disk rotor 1, and connected to both ends of the mounting portion 13. Bosses 14, 15 are formed at both ends of the mounting portion 13, and bolts (not shown) are inserted through the bosses 14, 15 so that the carrier 2 is positioned inside the hub mounting portion 6 of the disk rotor 1. Is attached to a non-rotating portion (not shown) of the vehicle body such as a knuckle arranged in the vehicle. In the present embodiment, the thickness of the support portions 11A and 12A is substantially uniform, and the width thereof is about 1/4 of the length of the pad support portions 8 and 9 in the disk rotor axial direction. The support portions 11A and 12A are formed in an arc shape along the outer periphery of the disk rotor 1, and extend at a fixed interval from the outer periphery of the disk rotor 1.
[0017]
Pin guides 16 and 17 are formed integrally with the pad support portions 8 and 9 between the pad receiving portions 8A, 8B, 9A and 9B and the support portions 11A and 12A in the circumferential direction of the disk rotor 1, and the caliper A slide pin (not shown) fixed to the side is slidably inserted through the pin guides 16 and 17 to guide the caliper movably along the axial direction of the disk rotor 1.
[0018]
The braking torque detecting arms 3 and 4 have mounting bosses 18 and 19 formed at one end thereof fastened together with the mounting portion 13 of the carrier 2 and fixed to a non-rotating portion. The arm portions 11 and 12 arranged on the outer peripheral portion extend to positions facing the rear ends of the support portions 11A and 12A. Displacement sensors 20 and 21 are attached to the distal ends of the braking torque detecting arms 3 and 4, and their detectors are in contact with the rear ends of the support portions 11A and 12A. The displacement sensors 20 and 21 detect the displacement of the support portions 11A and 12A along the circumferential direction of the disk rotor 1. The displacement sensors 20 and 21 are capable of detecting a slight displacement of the support portions 11A and 12A due to the braking torque as an electric signal, and include, for example, a differential transformer type displacement sensor, a light wave interference type displacement sensor, and a capacitance. A displacement sensor, a conductive rubber displacement sensor, or the like can be used.
[0019]
Slide pins are inserted into the pin guides 16 and 17 of the carrier 2 and calipers are mounted, outer and inner brake pads are mounted on the pad supports 8 and 9, and the carrier 2 and the braking torque detecting arms 3 and 4 are bolted. To a non-rotating part of the vehicle body such as a knuckle.
[0020]
Next, the operation of the present embodiment configured as described above will be described.
The outer and inner brake pads are pressed against the friction surface of the rotor portion 5 of the disk rotor 1 by a caliper to generate a braking force. When the rotation direction of the disk rotor 1 is the direction indicated by the arrow in FIG. 3 (when the vehicle is moving forward), the outer and inner brake pads are dragged by the disk rotor 1 by the braking torque, and the pad receiving portions 8A and 8B of the carrier 2 are moved. Press. As a result, the arm portion 11 is slightly elastically deformed, and the support portion 11A is displaced along the circumferential direction of the disk rotor 1. This displacement is detected by a displacement sensor 20 attached to the braking torque detecting arm 3. Since the amount of elastic deformation of the arm 11 is proportional to the magnitude of the braking torque, the braking torque can be accurately calculated by detecting the displacement of the support 11A.
[0021]
When the rotation direction of the disk rotor 1 is in the opposite direction (when the vehicle retreats), the outer pad and the inner pad are pressed against the pad receiving portions 9A and 9B of the carrier 2, so that the braking torque detecting arm 4 on the opposite side to the above. By detecting the displacement of the support portion 12A of the arm portion 12 by the displacement sensor 21 attached to the arm, the braking torque can be calculated.
[0022]
In this case, the pad supports 8, 9 having the pad receiving portions 8A, 8B, 9A, 9B which receive the braking torque are supported via the support portions 11A, 12A arranged at the axial center of the outer periphery of the disk rotor 1. Accordingly, no moment is generated in the supporting portions 11A and 12A due to the bending of the carrier 2 due to the braking torque, so that the braking torque can be accurately calculated without being affected by the moment.
[0023]
Further, by disposing the pin guides 16 and 17 between the pad receiving portions 8A, 8B, 9A and 9B and the support portions 11A and 12A in the circumferential direction of the disk rotor 1, the braking torque applied to the slide pins via the calipers. Can be simultaneously detected.
[0024]
Next, a second embodiment of the present invention will be described with reference to FIGS. Note that the same reference numerals are given to the same parts in the first embodiment, and only different parts will be described in detail.
[0025]
As shown in FIGS. 5 to 8, in the disc brake according to the second embodiment, the braking torque detecting arms 3 and 4 are omitted, and instead, the strain sensor 22 is mounted on one support portion 11 </ b> A of the carrier 2. Have been. The strain sensor 22 can detect a slight deformation of the support portion 11A due to the braking torque as an electric signal, and can use, for example, a strain gauge.
[0026]
Further, the pad receiving portions 8A and 9A of the pad supporting portions 8 and 9 of the carrier 2 and the pad receiving portions 9A and 9B are connected to each other by the outer beam 23 and the inner beam 24, respectively.
[0027]
With this configuration, the pad receiving portions 8A and 8B are pressed by the outer and inner pads dragged by the disk rotor 1 and the compressive force acts on the support portion 11A of the arm portion 11 at the time of braking while the vehicle is moving forward. The support 11A is slightly elastically deformed. The amount of deformation of the support 11A is detected by the strain sensor 22. Since the amount of deformation of the support 11A is proportional to the magnitude of the braking torque, the braking torque can be accurately calculated by detecting the amount of deformation of the support 11A.
[0028]
At the time of braking when the vehicle moves backward, the pad receiving portions 9A and 9B are pressed by the outer and inner pads. This force is transmitted to the opposite pad receiving portions 8A and 8B by the outer beam 23 and the inner beam 24, and the supporting portions are formed. A tensile force is applied to 11A, and the support portion 11A is elastically deformed. Since the amount of deformation of the support 11A is proportional to the magnitude of the braking torque, the braking torque can be accurately calculated by detecting the amount of deformation of the support 11A by the strain sensor 22.
[0029]
As described above, by connecting the pad receiving portions 8A, 9A and the pad receiving portions 8B, 9B to each other by the outer beam 23 and the inner beam 24, it is possible to detect the braking torque at the time of forward movement and at the time of retreat by one strain sensor 22. it can.
[0030]
As in the first embodiment, since no moment is generated in the support portions 11A and 12A due to the bending of the carrier 2, the braking torque can be accurately calculated without being affected by the moment generated in the carrier 2 by the braking torque.
[0031]
Note that the outer beam 23 and the inner beam 24 may be omitted, and the strain sensors may be provided on both the support arms 11 and 12 to separately detect the braking torque at the time of forward movement and at the time of backward movement. Also in the first embodiment, the outer beam 23 and the inner beam 24 that connect the pad receiving portions 8A and 9A and the pad receiving portions 8B and 9B to each other are provided. It is possible to detect both the braking torque at the time of forward movement and at the time of backward movement, and it is possible to omit the other braking torque detection arm 4 and the displacement sensor 21.
[0032]
In the first and second embodiments, the thicknesses of the support portions 11A and 12A do not have to be uniform. For example, the pad support portions 8 and 9 can be formed into a tapered shape with a large or small thickness. In the second embodiment, by attaching the strain sensor 22 to the thinned portions of the support portions 11A and 12A, the deformation amount with respect to the load increases, and it becomes easy to detect a small braking torque. The support portions 11A and 12A can be made thicker, and for example, can have a width substantially equal to the length of the pad support portions 8 and 9 in the disk rotor axial direction. Further, the distance between the support portions 11A, 12A and the outer periphery of the disk rotor 1 can be set as appropriate. In the first embodiment, the distance between the support portions 11A, 12A and the wheel is increased so as not to interfere with the wheel. The displacement amount of the portions 11A and 12A becomes large, and it becomes easy to detect a small braking torque.
[0033]
FIG. 9 shows an overall view of a caliper floating type disc brake to which the second embodiment is applied. In FIG. 9, reference numeral 25 denotes a caliper for pressing a pad by an electric motor, and 26 denotes a slide pin for guiding the caliper 25.
[0034]
FIG. 10 is an overall view when the second embodiment is applied to an opposed-piston disc brake. As shown in FIG. 10, a caliper 27 having two pairs of opposed pistons for pressing the outer brake pad and the inner brake pad, respectively, is formed integrally with the pad support portions 8 and 9 of the carrier 2. Also in this case, similarly to the above, the braking torque at the time of forward movement and at the time of backward movement can be detected by the strain sensor 22.
[0035]
Note that the calipers shown in FIGS. 9 and 10 can be combined with the first embodiment as well as the second embodiment.
[0036]
【The invention's effect】
As described above in detail, according to the disk brake of the first aspect of the present invention, the displacement or distortion generated in the support portion disposed at the axial center of the outer periphery of the disk rotor is detected, so that the moment generated in the carrier is detected. The braking torque can be detected without being affected.
According to the disc brake of the second aspect, the braking torque applied to the pad receiving portion is transmitted to the mounting portion of the carrier to the non-rotating portion via the support portion.
According to the disk brake of the third aspect of the present invention, a braking torque can be obtained by detecting a displacement generated in the support portion during braking.
Further, according to the disk brake of the fourth aspect of the invention, a braking torque can be obtained by detecting distortion generated in the support portion during braking.
[Brief description of the drawings]
FIG. 1 is a perspective view showing a main part of a disc brake according to a first embodiment of the present invention.
FIG. 2 is a plan view of a main part of the disc brake shown in FIG.
FIG. 3 is a front view of a main part of the disc brake shown in FIG.
FIG. 4 is a side view of a main part of the disc brake shown in FIG. 1;
FIG. 5 is a perspective view showing a main part of a disc brake according to a second embodiment of the present invention.
FIG. 6 is a plan view of a main part of the disc brake shown in FIG.
FIG. 7 is a front view of a main part of the disc brake shown in FIG. 5;
8 is a side view of a main part of the disc brake shown in FIG.
FIG. 9 is a perspective view of a caliper floating disc brake to which a second embodiment of the present invention is applied.
FIG. 10 is a perspective view of an opposed piston disc brake to which a second embodiment of the present invention is applied.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Disc rotor 2 Carrier 8A, 8B, 9A, 9B Pad receiving part 11A, 12A Support part 13 Mounting part 20 Displacement sensor (detection means)
22 Strain sensor (detection means)
25,27 caliper

Claims (4)

A brake pad disposed on both sides of the disk rotor, a carrier that supports the brake pad, a carrier fixed to a non-rotating portion, and a disc brake including a caliper that presses the brake pad against the disk rotor;
A pad receiving portion for receiving a braking torque from the brake pad of the carrier is supported by a supporting portion disposed at an axial center of an outer periphery of the disk rotor, and a detecting means for detecting displacement or distortion of the supporting portion is provided. Characterized disc brake. The said support part is extended along the outer periphery of the said disk rotor from the back part of the said pad receiving part, and is connected with the attachment part to the non-rotation part of the said carrier, The Claims characterized by the above-mentioned. Disc brake. The disc brake according to claim 1, wherein the detection unit is a displacement sensor fixed to the non-rotating portion and configured to detect a displacement of the support portion. The disk brake according to claim 1, wherein the detection unit is a distortion sensor provided on the support unit and configured to detect a distortion of the support unit.

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