JPS6159031A - Disc brake unit of car - Google Patents

Abstract

PURPOSE:To suppress brake noise by pressing a disc rotor turning together with a wheel by means of a pad member supported by a support member. CONSTITUTION:Pad members 22, 23 disposed in opposition to the frictional surfaces 1a, 1b of a disc rotor 1 are formed of pads 22A, 23A and back plates 22B, 23B attached to the backs of sad pads respectively. The projections 24, 25 of the pad members 22, 23 are loosely fitted into notches 28, 29 formed on a support member 6. And the pad numbers 22, 23 are so supported as capable of moving perpendicularly to the frictional surfaces 1a, 1b of the disc rotor 1. Owing to this construction, the brake noise can be suppressed because portions disposed on the frictional surface side of the pad members are kept in the condition hardly suffering from the effect of vibration.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention relates to a disc brake for an automobile that performs braking by pressing a friction surface of a disc rotor that rotates together with a wheel with a band member supported by a support member. Regarding equipment.

(Prior art) The general configuration of an automobile disc brake device is as follows:
As shown in FIG. 6 and FIG. 6, a disc rotor l having a pair of friction surfaces 1a and 1b facing each other is mounted to rotate together with the wheel. Pad members 2 and 3 are provided. Pad members 2 and 3
is a pad 2A that presses the disc rotor 1 with its front surface.
and 3A, and back plates 2B and 3B to which the back surfaces of these pads 2A and 3A are fixed, and on both end surfaces of the back plates 2B and 3B, for example, rectangular protrusions 4 and 5 are arranged symmetrically. established in These projections 4 and 5 are engaged with notches 8 and 9 formed in the support member 6 which is arranged to sandwich the friction surfaces 1a and 1b of the disc rotor 1, whereby the pad members 2 and 3 are engaged with. It is supported by the support member 6 so that it can move freely.

A caliper IO is disposed so as to straddle the disc rotor 1 and pad members 2 and 3 described above. The caliper 10 includes a piston 12 arranged behind the pad member 2.
a cylinder part 14 that moves the pad member 2 in a direction perpendicular to the friction surface 1a of the disc rotor 1 by moving the pad member 2 back and forth; and a reaction section 15 that moves in the direction.

When a braking operation is performed by the automobile disc brake device configured as described above, the cylinder portion 1
4 is activated to cause the piston 12 to protrude. As a result, the pad member 2 becomes the friction surface 1a of the disc rotor 1
At the same time, the cylinder part 14 is moved in the opposite direction to the piston 12 by the reaction, and the reaction part 15 moves accordingly, and the pad member 3
presses the friction surface 1b of the disc rotor 1. As a result, the disc rotor 1 is compressed by the pad members 2 and 3, and a braking action is obtained in which the rotational movement of the disc rotor 1 is suppressed.

By the way, brake noise in automobiles is an undesirable thing that can affect the commercial value of automobiles, and various measures have been proposed to reduce brake noise for various types of brake devices. ing. The disc brake device as described above is no exception, and brake noise reduction measures such as those disclosed in Japanese Utility Model Application Laid-Open No. 57-77736, for example, have been proposed.

However, the degree and occurrence of brake noise vary depending on the usage conditions and history of the brake device, and it may be difficult to reduce it effectively. Regarding the brake noise generated in the disc brake system of an automobile, the cause of its occurrence has not been fully investigated, and no effective measures have been found to reduce it.

In an automobile disc brake device having the configuration as shown in FIG. 5 and FIG. When a braking operation is performed while the disc rotor 1 is rotating in the forward direction, the pad members 2 and 3 are pushed by the piston 12 and the reaction part 15, and the pads 2A and 3A are applied to the friction surface 1a of the disc rotor 1. and 1b. At this time, the projections 4 and 5 provided on the back plates 2B and 3B of the band members 2 and 3 touch the friction surface 1a of the disc rotor l of the pad members 2 and 3.
Since it is loosely fitted into the notches 8 and 9 of the support member 6 so as to allow movement in the direction orthogonal to the pad members 2 and 1b, the friction surfaces 1a and lb of the disc rotor 1 are connected to the pads 2A and 3A of the pad members 2 and 3. When pressed, the pad members 2 and 3 are given a rotational force from the disc rotor 1 in the direction shown by the arrow Q in FIG. Here, the protrusion 4
When the side end surface 4a of the pad members 2 and 3 fully abuts the notch 8 formed on the trailing side indicated by T in FIG. The reaction force F° against the braking reaction force F is 0 in Fig. 5.
from the support member 6 at the point.

The side end surface 4a of the protrusion 4 and the notch 8 that engage in this way
Due to the abutting state with a clearance of such a degree that the protrusion 4 is in contact with the other end, and due to uneven wear of one or both of the side end surface 4a of the protrusion 4 and the notch 8, rotation occurs in the direction shown by the arrow Q in FIG. The powered pad members 2 and 3 rotate slightly in the direction shown by the arrow Q, and as a result, the upper end surface of the protrusion 5 (on the outer peripheral side of the disc rotor 1) is shown by L in FIG. A state occurs in which the notch 9 formed on the leading side comes into contact with the lower end surface on the upper side and is pressed with a force g. In such a situation,
Since the band members 2 and 3 are movable in a direction perpendicular to the friction surfaces 1a and 1b of the disc rotor 1, they are allowed to rotate around the axis indicated by the dashed line in FIG. As a result, they rotate in the direction shown by the arrow R in FIG. 5, and the lower side of the leading side (the inner peripheral side of the disc rotor 1) is in a state where it is easy to vibrate. Then, vibration occurs on the lower side of the leading side of the pad member 2 or 3, resulting in unpleasant brake noise.

As described above, the vibrations on the lower side of the leading side of the pad member that presses the friction surface of the disc rotor, which occur in the conventional automobile disc brake device having the configuration shown in FIGS. 5 and 6, No effective means has been found to reduce the resulting brake noise.

(Object of the Invention) In view of the above, the present invention is configured to perform braking by pressing a disc rotor rotating together with a wheel with a pad member supported by a support member, and furthermore, the leading side of the pad member To provide a disc brake device for an automobile capable of effectively reducing undesirable brake noise generated due to vibration of a portion located on the inner peripheral side of a friction surface of a disc rotor. The purpose is to

(Structure of the Invention) The disc brake device for an automobile according to the present invention includes a pad whose front surface is pressed against the friction surface of the disc rotor to apply braking force to a disc rotor that rotates together with the wheel, and a back plate to which the back surface of the pad is fixed. and a support member that supports the pad member in a movable manner. The rotational force that is received by the outer peripheral side of the disc rotor on the trailing side and generated by the reaction force against the braking reaction force on the pad member is transferred to the disc rotor on the leading side through the back plate. It is configured to be received by a portion located on the inner peripheral side.

With this configuration, the pad member having the pad that presses the friction surface of the disc rotor is unlikely to cause vibration in the portion located on the inner peripheral side of the friction surface of the disc rotor on its leading side. As a result, unpleasant brake noise is effectively reduced.

(Example) Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 and FIG. 2 are a schematic sectional view and a schematic plan view, respectively, showing the main parts of an example of a disc brake device for an automobile according to the present invention.

In FIGS. 1 and 2, parts corresponding to those shown in FIGS. 5 and 6 described above are designated by common reference numerals, and redundant explanation thereof will be omitted.

In FIGS. 1 and 2, band members 22 and 2 are arranged opposite to the friction surfaces 1a and 1b of the disc rotor 1.
3 is formed of pads 22A and 23A whose front surfaces are pressed against the friction surfaces 1a and 1b of the disc claw 1, respectively, and back plates 22B and 23B to which the back surfaces of these pads 22A and 23A are fixed. These back plates 22B and 23
Rectangular protrusions 24 and 25 are provided at each side end of B, as described below. That is, when the automobile equipped with the disc brake device of this embodiment moves forward, the disc rotor 1 rotates in the direction indicated by the arrow in FIG.
In each of these, a protrusion 24 provided on the trailing side T thereof is located on the upper side of each of the back plates 22B and 23B, that is, on the outer peripheral side of the disc rotor 1, Further, the protrusion 25 provided on the leading side of the back plate 22B and 23
It is located on the lower side of B, that is, on the inner peripheral side of the disc rotor 1.

In this way, the protrusions 24 and 25 provided on the back plates 22B and 23B of the pad members 22 and 23, respectively, are loosely fitted into the notches 28 and 29 formed in the support member 6, so that the banodor Each of the members 22 and 23 is
The support member 6 supports the fJp surface 1 of the disc rotor 1.
It is supported so that it can move in a direction perpendicular to a and 1b.

The other parts are constructed similarly to the disc brake device shown in FIGS. 5 and 6 described above.

Based on such a configuration, when a braking operation state is taken, the fifth
As in the case of the disc brake device shown in FIG. 6 and FIG.
2 is projected, and as a result, the pad member 22 is moved so as to press the friction surface 1a of the disc rotor 1 with its pad 22A, and the cylinder portion 14 is moved in the opposite direction to the piston 12 by the reaction. As a result, the band member 23 is moved via the reaction portion 15 so as to press the friction surface 1b of the disc rotor 1 with its pad 23A.

In this way, the friction surfaces 1a and 1 of the disc rotor 1
b is the pad 22A and 23A of the pad members 22 and 23.
When pressed, on the trading side T, the protrusions 24 provided on the pad members 22 and 23, respectively, and the notch 28 formed in the support member 6 on which the side end surfaces 24a of the protrusions 24 come into contact, open the disc rotor 1. Therefore, the braking reaction force F acting on the support member 6 and the band members 22 and 23 is received at the position H (FIG. 1) on the outer peripheral side of the disc rotor 1. . That is, the notch 28 of the support member 6 is connected to the pad member 2.
The braking reaction force F acting on the back plates 22B and 23
This forms a receiving part that receives the material via B. In this way, the support member 6 receives the braking reaction force F acting on the pad members 22 and 23 at a position on the outer peripheral side of the disc rotor 1, so that the pad members 22 and 23 receive the braking reaction force F acting on the pad members 22 and 23. A reaction force against F is applied to generate a rotational force in the direction shown by arrow M in FIG. A notch 2 in which a side end surface 25a is formed in the support member 6.
9 and presses it with a force g". That is, the support member 6 applies a rotational force generated by a reaction force to the braking reaction force F to the pad members 22 and 23 inside the disc rotor 1. The notch 29 of the support member 6 forms a receiving part that receives this rotational force generated in the pad members 22 and 23 via the back plates 22B and 23B. In this case, even if one or both of the side end surface 24a of the protrusion 24 and the notch 28 are unevenly worn, the pad members 22 and 23 are not affected as shown by the arrow M in FIG. A rotational force in the direction is generated, and the lower end surface 25a of the protrusion 25 provided on each of the pad members 22 and 23 presses the lower end surface of the notch 29 formed in the support member 6. Be taken.

Therefore, the lower end surface 25a of the protrusion 25 and the notch 2
Due to the frictional resistance between the lower end surface of the pad members 22 and 23 and the upper end surface of the lower side of the notch 29, the pad members 22 and 23 are located on the inner peripheral side of the friction surfaces 1a and 1b of the disc rotor on the leading side, respectively. As a result, brake noise is significantly reduced.

3 and 4 are a schematic sectional view and a schematic plan view showing the main parts of another example of the disc brake device for an automobile according to the present invention. In these figures 3 and 4,
Portions corresponding to those shown in FIG. 1 and FIG. 2 are shown with common reference numerals, and redundant explanation thereof will be omitted.

While the examples shown in Figures 1 and 2 aim to reduce brake noise when the car is moving forward, this example aims to reduce brake noise not only when moving forward but also when reversing. It is said that

In FIGS. 3 and 4, pad members 32 and 33 are formed of pads 32A and 33A and back plates 32B and 33B, as in the example of FIGS. 32B and 33B have rectangular projections 34, 35.
34' and 35'' are provided.Protrusions 34 and 3
5, corresponds to the protrusions 24 and 25 in the examples shown in FIGS. 1 and 2, and the protrusion 34 on the trailing side T when the vehicle moves forward is attached to the friction surface 1a of the disc rotor 1. The protrusions 35, which are provided on the outer circumferential side of the disc rotor 1 and the leading side, are provided on the inner circumferential side of the friction surfaces 1a and 1b of the disc rotor 1. In addition, a protrusion 34', which becomes the trading side T'' when the vehicle is reversing, causes the disc rotor 1 to rotate in the direction indicated by the arrow D° in FIG. A protrusion 35' provided on the outer circumferential side and serving as the leading side L' is provided on the inner circumferential side of the friction surfaces 1a and 1b of the disc rotor 1.

On the other hand, the support member 6 has notches 38, 39 and 38 into which the projections 34, 35, 34 and 35 are loosely fitted, respectively.
' and 39'' are provided.

Based on this configuration, when a braking operation state is taken when the vehicle moves forward, the back plates 32B and 33B of the pad members 32 and 33 are The side end surfaces 34a of the projections 34 provided on each of the pads press the notches 38 formed in the support member 6, and a rotational force is generated in the pad members 32 and 33 in the direction indicated by the arrow M in FIG. , back plate 32B of pad members 32 and 33
and the lower end surface 35 of the protrusion 35 provided in each of 33B.
a presses the upper end surface of the lower side of the notch 39 formed in the support member 6. As a result, the lower portions of the pad members 32 and 33 on their respective leading sides, that is, the portions on the inner peripheral side of the friction surfaces 1a and 1b of the disc rotor 1, are Similarly, it is made less susceptible to vibrations, so that undesired brake noise is reduced.

In this case, the lower end surface 34Xa of the protrusion 34''
Either the lower end surface 35a of the protrusion 35 abuts the lower upper end surface of the notch 39 before it abuts the lower upper end surface of the notch 39'', or the lower end surface of the protrusion 35 35a comes into contact with the upper end surface of the lower side of the notch 39, and the lower end surface 34°a of the protrusion 34'' comes into contact with the lower end surface of the notch 39''.
The contact timing with the upper end surface of the lower side is made to be the same time.

In the latter case, the lower end surface 3 of the protrusion 35
5a and the upper end surface of the lower side of the notch 39;
Due to the friction horn between the lower end surface 34a of the protrusion 34° and the lower upper end surface of the notch 39, the leading side portions of the pad members 32 and 33 are further vibrated. This makes it difficult to detect the noise, and the noise is further reduced.

Further, when the braking operation state is taken when the vehicle is moving backward, the disc rotor l is moved to the third
Rotates in the direction of arrow D'' in the figure, and at this time, on the trading side T°, the protrusions 34' provided on each of the bar throat members 32 and 33 are connected to the notch 39'' formed in the support member 6. The support part +46 receives the braking reaction force acting on the pad members 32 and 33 at a position on the outer peripheral side of the disc rotor 1. That is, the notch part 39' of the support member 6 Members 32 and 33
This forms a receiving portion that receives the braking reaction force acting on the brake through the back plates 32B and 33B.

In this way, the support member 6 is connected to the pad members 32 and 33.
By receiving the braking reaction force acting on the outer peripheral side of the disc rotor l, the pad members 32 and 33 have the following properties:
A rotational force is generated in the direction indicated by the arrow M' in FIG. , comes into contact with and presses the upper end surface of the lower side of the notch 38' formed in the nabot member 6. That is, the support member 6 receives the rotational force generated in the pad members 32 and 33 at a position on the inner circumferential side of the disc rotor 1, and the notch 38° of the support member 6 receives the rotational force generated in the pad members 32 and 33. This rotational force generated on the back plate 32
This forms a receiving part that receives the parts via B and 33B.

Therefore, due to the frictional resistance between the lower end surface 35a of the protrusion 35'' and the lower upper end surface of the notch 38'',
The portions of the pad members 32 and 33 located on the inner peripheral side of the friction surfaces 1a and 1b of the disc rotor 1 on the sliding side L' vibrate and are brought into a state of tension, and as a result, brake noise is generated. This will result in a significant reduction.

Also in this case, the lower end surface 34a of the protrusion 34
The lower end surface 35°a of the projection 35' comes into contact with the upper end surface of the lower side of the notch 38' before the projection 35' comes into contact with the upper end surface of the lower side of the notch 38, or the projection 35' The timing at which the lower end surface 35'a abuts the lower end surface of the notch 38'' and the timing at which the lower end surface 34a of the protrusion 34 abuts the lower end surface of the notch 38 are the same. In the latter case, the frictional force between the lower end surface 35°a of the protrusion 35' and the lower upper end surface of the notch 38' and the lower Due to the frictional force between the side end surface 34a and the lower side upper end surface of the notch 38,
The leading side L' portions of each of the pad members 32 and 33 are made more difficult to vibrate, and brake noise is further reduced.

(Effects of the Invention) As is clear from the above description, in the automobile disc brake device according to the present invention, when the pad of the pad member is pressed against the friction surface of the disc rotor, the support member acts on the pad member. The braking reaction force is received by the part located on the outer peripheral side of the disc rotor on the trading side, and the rotational force generated by the reaction force against the braking reaction force is received by the band member at the part located on the inner peripheral side of the disc rotor on the leading side. Therefore, during a braking operation, the portion of the band member located on the inner peripheral side of the friction surface of the disc rotor on the leading side is greatly constrained, making it difficult to generate vibrations. As a result, unpleasant brake noise can be effectively reduced.

[Brief explanation of drawings]

1 and 2 are a schematic cross-sectional view and a schematic plan view, respectively, showing the main parts of an example of an automobile disc brake device according to the present invention, and FIGS. A schematic configuration diagram and a schematic plan view showing the main parts of another example of a disc brake device for an automobile, and FIGS. 5 and 6 respectively show the main parts of an example of a conventional general disc brake device for an automobile. It is a schematic sectional view. In the figure, 1 is a disc rotor, 1a and 1b are friction surfaces, 6
22, 23, 32 and 33 are band members, 228, 23A, 32A and 33A are pads, 22
B, 23B, 32B and 33B are back plates, 34, 35, 3
4° and 35" are protrusions, 28, 29.38, 39.3
8' and 39° are notches.

Claims (1)

[Claims] A pad member comprising a pad whose front surface is pressed against the friction surface of the disc rotor in order to apply braking force to a disc rotor that rotates with a wheel, and a back plate to which the back surface of the pad is fixed; a support member movably supported, the support member receiving a braking reaction force acting on the pad member when the pad is pressed against the friction surface of the disc rotor via the back plate; a second receiving portion, the second receiving portion having a receiving portion in a portion located on the outer peripheral side of the disc rotor on the trailing side, and receiving a rotational force generated by a reaction force against the braking reaction force on the pad member via the back plate; A disc brake device for an automobile, comprising a receiving portion on a leading side of the disc rotor at a portion thereof located on the inner peripheral side of the disc rotor.