JPH04107330A - Disk brake - Google Patents

Abstract

PURPOSE:To reduce abnormal sound when brake is applied by providing an elastic member which elastically transmits torque given to a brake pad from a disk rotor to a torque receive face from a torque transmission face. CONSTITUTION:When a driver steps on a brake pedal, brake liquid pressure is supplied to the cylinder bore of a liquid pressure cylinder, a piston presses an inner pad 20 on the friction face of a disk rotor, and a reaction area presses an outer pad on the other friction face due to its reaction force. At this time, since torque of the disk rotor is given to the inner pad 20 and outer pad, a torque transmission face 56 approaches a torque receive face 58 against energizing force of an anti-rattle spring 70, the bottom face of a recessed part of a plate spring unit 66 makes contact with the torque receive face 58, and the plate spring unit 66 is deformed due to elasticity between the torque transmission face 56 and the torque receive face 58.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a disc brake for a vehicle, and more particularly to a technique for preventing abnormal noise generated during braking.

A conventional disc brake for a vehicle is composed of a disc rotor torque receiving member, a brake butt, an actuator, and the like. A brake pad, which is supported movably in a direction parallel to the axis of the disc rotor by a torque receiving member non-rotatably disposed near the disc rotor on a disc rotor rotating together with the wheel, is also supported by the torque receiving member. It is pushed forward by the supported actuator, and the vehicle is braked by the frictional force generated between the brake pad and the disc rotor.

With disc brakes like the one above, when braking, about 1
No. 000-1 Abnormal noise with a frequency of several thousand Hz (so-called "squeal")
In order to prevent this squeal, for example, a shim for preventing squeal has been provided as described in Japanese Utility Model Application Publication No. 1-58835. A shim is placed on the brake pad, and during braking, the actuator presses the brake pad against the friction surface of the disc rotor via the shim, which effectively prevents squeal. I can do it.

Problems to be Solved by the Invention As in the above-mentioned invention, efforts have been made to prevent squeal by installing shims, etc., but it is said that an abnormal noise other than squeal may be generated during braking. There was a problem. This abnormal noise has a frequency of several hundred Hz, which is lower than that of a squeal, and while sniffing is more likely to occur during gentle braking, it is more likely to occur during relatively strong braking. This sound is caused by the vibration of the brake pad being transmitted from the torque transmitting surface of the brake pad through the torque receiving surface of the first herk receiving member to the suspension and other members near the disc brake, and these suspension members and the vehicle body resonate. It is thought that it will happen. In recent years, organic fibers have been used instead of asbestos as raw materials for brake pads, and in this case, noise is particularly likely to occur, but no countermeasures are known yet to prevent this noise from occurring.

The present invention has been made with the object of providing a disc brake that can reduce the occurrence of the above-mentioned abnormal noise during braking.

Means for Solving the Problems And the gist of the present invention is to provide the above (a) disk rotor, (
b) I-luke receiving member, (C) brake pad, (d)
In a disc brake configured to include an actuator, a torque transmitting surface is provided between the first herk receiving surface of the torque receiving member and the torque transmitting surface of the brake butt to transmit the torque applied from the disc rotor to the brake butt during braking. The reason lies in the provision of an elastic member that elastically transmits torque from the torque receiving surface to the torque receiving surface.

Function In the disc brake with the above configuration, the torque applied from the disc rotor to the brake pads during braking is
The torque is transmitted from the torque transmitting surface to the torque receiving surface of the first herk receiving member via the elastic member.

Since the elastic member is in a state where it can be elastically deformed even during torque transmission, it absorbs vibrations from the brake pad and reduces the vibrations transmitted to the torque receiving member. The vibrations of the suspension and vehicle body are reduced compared to when the vibrations are transmitted to the sliding surface.

Effects of the Invention Therefore, resonance of the suspension member etc. caused by vibrations transmitted from the torque receiving member is suppressed, and generation of abnormal noise can be reduced.

Embodiments Hereinafter, embodiments of the present invention will be described in detail based on the drawings.

In FIG. 10, 10 is a disc rotor, which is rotated together with the wheels. A mounting bracket 12 as a torque receiving member is provided near the disc rotor 10.
is connected to the vehicle body via a suspension member and is arranged in a non-rotatable manner. mounting bracket 12
has a shape in which pad support parts 1314 located on both sides of the disc rotor 10 are connected by a connecting part 16 (see FIG. 1) extending beyond the outer periphery of the disc rotor 10, and the pad supporting parts 1314 are connected by a connecting part 16 (see FIG. It is placed in a similar condition. The disc rotor 10 has friction surfaces 18 on both sides of the outer circumference.
A pair of brake butts, that is, an inner pad 20 and an outer pad 22, are arranged opposite these friction surfaces 18. Each band 20.22 consists of a friction material 24.26 and a steel backing plate 28.30 secured to its back side. these bands 2022
is supported by the mounting bracket 12 so as to be slidable in a direction parallel to the axis of the disc rotor 10, and is pressed against the disc rotor 10 by a caliper 32 serving as an actuator. The caliper 32 includes a hydraulic cylinder 34 provided opposite to the back surface of the inner band 20, a reaction portion 36 provided opposite to the back surface of the AUC band 18, and a disc rotor 1.
It is equipped with a connecting part 38 that connects beyond the outer circumference of 0,
It is supported so as to be movable in a direction parallel to the axis of the disc rotor 10 by two slide pins (not shown) installed upright using the female screw holes 40 (see FIG. 1) of the mounting bracket 12. Therefore, when braking hydraulic pressure is supplied to the cylinder pore 42 of the hydraulic cylinder 34,
The piston 44 connects the inner pad 20 to the disc rotor 10
The reaction part 3 is pressed against the friction surface 18 of the
6 presses the outer band 22 against the other friction surface 18.

As shown in the first part, a pad accommodation notch 50 is formed in the pad support portion 13 of the mounting bracket 12, and on both sides of this notch 50, there are small rectangular notches 52 (not shown in the figure) that open into the notch 50. (only one side is shown) is formed. The back plate 28 of the inner pad 20 is provided with a pair of ears 54 (only one shown in the figure) that protrudes from the lower end of both ends to both sides, and these ears 54 are connected to the small notches 52.
The band accommodating notches 50 are accommodated in a state in which they are respectively engaged with each other. When braking, the inner surface of the butt housing notch 50 of the mounting bracket I.
4 comes into contact with the side surface closer to the outer periphery of the disc rotor (the upper surface in the figure), and torque is transmitted. That is, in this embodiment, the side surface of the back plate 28 of the inner band 20 functions as the torque transmission surface 56, and the portion of the mounting bracket 12 corresponding to the torque transmission surface 56 of the pad accommodation notch 50 functions as the torque receiving surface 58. be.

A stainless steel spring member 60 is disposed between the I-lux receiving surface 58 of the mounting bracket 12 and the torque transmitting surface 56 of the back plate 28.

As shown in FIGS. 2 and 3, the spring member 60 has two
A plate spring part 66 having a gentle waveform having two convex parts 62 and one concave part 64, a flat plate part 68 extending from one end of the plate spring part 66, and the flat plate part 68 being bent. It consists of an anti-ladle spring 70. Therefore, when the spring member 60 is disposed on the mounting brackets I to 12, the leaf spring portion 60 is disposed between the torque receiving surface 58 and the torque transmitting surface 56, as shown in FIG.
6 has a flat plate portion 68 between the side wall 72 of the small notch 52 and the surface 73 of the ear portion 54, and an end spring 70 between the bottom wall 74 of the small notch 52 and the surface 75 of the ear portion 54. Each of them will be in an intervening state. The anti-ladle spring 70 includes a curved portion 76 and an engaging portion 78, which sandwich the pad support portion 13 of the mounting bracket 12 from both sides, thereby causing the spring member 60 to move in the direction parallel to the disk rotor axis. Prevent movement. In addition, the flat plate part 68
is sandwiched between the ear portion 54 and the pad support portion 13, thereby preventing the spring member 60 from moving in the radial direction of the disc rotor.

The spring constant of the anti-ladle spring 70 is 1 kg/
mm, and the working load is 1 kg, whereas the plate spring part 6
The spring constant of 6 is 500 kg/mm, and the maximum working load is 5
It is said to be 00 kg. The spring characteristics of the spring member 60 are set in two stages, as shown in the graph of FIG. In the figure, the dashed line indicates the spring characteristics of the conventional anti-ladle spring.

Note that the outer pad 22 side is also similar to the inner pad 20 side, and is provided with a spring member 60 (not shown).

In the disc brake configured as described above, when not braking, the bottom wall 74 of the small notch 52 and the surface 75 of the ear portion 54 are separated by the biasing force of the annular spring 70, and the other torque (not shown) is By bringing the transmission surface into contact with the torque receiving surface, rattling of the inner pad 20 and the outer pad 22 is prevented. Further, the flat plate portion 68 prevents rusting between the ear portion 54 and the small notch 52 and reduces friction. In this state, the top surfaces of both convex portions 62 of the leaf spring portion 66 are connected to the torque transmission surface 56.
On the other hand, the bottom surface of the recess 64 is in contact with the L/L receiving surface 58.
The plate spring portion 66 is in a free state.

On the other hand, when the driver depresses the brake pedal (not shown), braking fluid pressure is supplied to the cylinder bore 42 of the hydraulic cylinder 34, the piston 44 presses the inner pad 20 against the friction surface 18 of the disc rotor 10, and the reaction force causes a reaction. The portion 36 pushes the outer pad 22 against the other friction surface 18. At this time, since the torque of the disc rotor 10 is applied to both pads 20 and 22, the l/luke transmission surface 56 approaches the torque receiving surface 58 against the biasing force of the anti-ladle spring 0, and the leaf spring portion The bottom surface of the recessed portion 64 of 66 comes into contact with the torque receiving surface 58, and the plate spring portion 66 is elastically deformed between the I and torque transmitting surface 56 and the torque receiving surface 58. At this time, the plate spring portion 66 does not become completely flat. The maximum torque scheduled to be applied to the pad 20.22 during sudden braking (at this time, the temporary spring portion 66
The load characteristics are set so that the leaf spring part 66 will not be completely crushed even by the load applied to it (the maximum working load is 500 kg), and the leaf spring part 66 will transmit torque while being elastically deformable. It is being done.

When the brake pedal is released, the hydraulic pressure in the cylinder bore 42 decreases, the pressure of both pads 20° 22 against the disc rotor 10 is released, and the pad 2022 is in a state where it does not receive torque from the disc rotor 10. . Therefore, first, the elastic deformation of the leaf spring portion 66 is eliminated, and then the elastic deformation of the anti-ladle spring 70 is eliminated.
Torque transmitting surface 56 is spaced apart from torque receiving surface 58.

When braking is performed as described above, the load that moves the pad 20.22 toward the torque receiving surface 58 based on the torque applied to the pad 20.22 from the disc rotor 10 is as shown in FIG. In this embodiment, the torque transmission surface 56. Since the leaf spring portion 66 is disposed between the I-luke receiving surfaces 58, most of the vibrational changes in this load are absorbed by the leaf spring portion 66 and are not transmitted to the mounting bracket 12.
Vibration of the suspension members and the vehicle body is reduced, and generation of abnormal noise is effectively prevented.

A noise prevention test was conducted using a disc brake equipped with the spring member 60 of this example. The results are shown in Table 1 below. Furthermore, for the sake of demonstration, a similar test was also conducted on a disc brake equipped with a normal anti-ladle spring that does not have the leaf spring section 66. The results are shown in Table 2. The test conditions for both tests are as follows.

Gross vehicle weight: 1500kg passenger table Initial braking speed: 50km/h Deceleration: 0.2~0.8g Disc rotor temperature before braking: 40~160°C
Table 2 From the above test results, it can be seen that in the conventional disc brake in which the spring member 60 is not provided, a small abnormal noise is already generated when the deceleration is 0.2 g, but in the case of the spring member with the leaf spring part 66. In the disc brake of this example equipped with 60 g, no abnormal noise was generated at all up to 0.4 g, confirming the effectiveness of the present invention.

Another embodiment of the invention is shown in FIGS. 6 and 7. Note that the same members as those in the above embodiment are given the same reference numerals and detailed explanations will be omitted.

The spring member 80 of this embodiment includes an elastic portion 82, a flat plate portion 84, and an anti-ladle spring 86. The elastic part 82 is a stainless steel support part 88 extending from the flat plate part 84.
If a spring member 80 is installed on the mounting bracket 12, an elastic force is created between the torque receiving surface 58 and the torque transmitting surface 56, as shown in FIG. 82 is located. When not braking, the rubber pad 90 of the elastic part 82 comes into contact with the 1-luke transmission surface 56 due to the biasing force of the anti-ladle spring 86, and the support part 58 is in a state separated from the torque receiving surface 58, but when braking, the torque is transmitted. Surface 56 and torque receiving surface 5
8 and is elastically deformed. Since the spring constant of the rubber pad 90 is set to be as high as the spring constant of the leaf spring section 66, most of the vibration of the band is absorbed by the elastic deformation of the elastic section 82 and is no longer transmitted to the torque receiving surface 58. .

In the spring member 80 of this embodiment, since the elastic portion 82 has internal hysteresis, a damping effect can be obtained in addition to a vibration absorbing effect, which has the advantage of being highly effective in preventing noise generation.

In addition, an elastic portion 96 such as a spring member 94 shown in FIG.
The rubber pad 1" 90 may be covered with a heat insulating material 98 such as glass wool. In this way, the pad 20.
22 and the disc rotor 10, deterioration of the rubber parallax 90 due to heat generated by friction between the disc rotor 10 and the disc rotor 10 can be reduced.

Yet another embodiment of the invention is shown in FIG. The spring member 100 of this embodiment has a leaf spring section 102 similar to the leaf spring section 66 of the first embodiment. It consists of a flat plate part 104 and an anti-ladle spring 106, and the anti-ladle spring 106 is located on the bottom wall side of the pad accommodation notch 50 of the mounting bracket 12, and moves the pad 20.22 from the center side of the disc rotor 10 to the outer peripheral side. It is designed to be energized. In this embodiment, when the band 20.22 is not in operation, the biasing force of the anti-ladle spring 106
The surface 73 of each ear 54 contacts the side wall 72 of the small notch 52, thereby preventing the pad 20.22 from rattling. The spring member 100 of this embodiment is particularly effective when installed in a disc brake installed on the upper side of a vehicle.

Although several embodiments of the present invention have been described above, the elastic member may have other forms as long as it has load characteristics that can reduce vibrations transmitted from the torque transmitting surface to the torque receiving surface. good.

In addition, in each of the above embodiments, the plate spring portion or the elastic portion, which is the elastic member, and the anti-ladle spring are integrally formed, which reduces the number of parts and also allows the plate spring portion or the elastic portion, which is the elastic member, to be integrally formed with the anti-ladle spring. Alternatively, the effect of functioning as an attachment part to the mountain bracket 1 can be obtained, but these elastic members and the anti-ladle spring may be provided separately, or only the elastic member may be provided. .

In addition, various modifications may be made based on the knowledge of those skilled in the art.

The invention can be practiced in modified forms.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing the main parts of a disc brake according to an embodiment of the present invention. FIG. 2 is a front view showing the elastic member disposed in the disc brake, and FIG. 3 is a side view. FIG. 4 is a graph showing the spring characteristics of the elastic member, and FIG. 5 is a graph showing an example of a load waveform when abnormal noise occurs. FIG. 6 is a perspective view showing an elastic member according to another embodiment of the present invention, and FIG. 7 is a partial front view showing a state in which the elastic member shown in FIG. 6 is attached to a disc brake. FIG. 8 is a perspective view showing an elastic member according to another embodiment of the present invention, and FIG. 9 is a partial front view showing still another embodiment. FIG. 10 is a front sectional view of the disc brake of FIG. 1. 10: Disc rotor 12: Mounting bracket 20: Inner pad 22: Outer pad 32: Caliper 34: Hydraulic cylinder 36: Reaction part 44: Pis 1 to 56: Torque transmission surface 5
8: Torque receiving surface 60: Spring member 66: Leaf spring portion 80: Spring member 94: Spring member 100: Spring member 82: Elastic portion 96: Elastic portion 102: Leaf spring portion

Claims (1)

[Scope of Claims] A disc rotor that rotates together with the wheel, a torque receiving member that is non-rotatably disposed near the disc rotor, and is movable in a direction parallel to the axis of the disc rotor by the torque receiving member. A disc brake comprising: a brake pad supported by the torque receiving member; and an actuator supported by the torque receiving member and pressing the brake pad against the disc rotor, wherein a torque receiving surface of the torque receiving member and a torque transmitting surface of the brake pad A disc brake characterized in that an elastic member is disposed between the disc rotor and the brake pad to elastically transmit the torque applied from the disc rotor to the brake pad during braking from the torque transmitting surface to the torque receiving surface.