JPH06330966A - Disc brake - Google Patents

Abstract

PURPOSE:To provide a disc brake which facilitates separation of a friction pad from a disc rotor. CONSTITUTION:A axially stretched notch 12 is formed on the torque receiving surface part 9 of a friction pad press part 11. The spring constant of a friction pad press part 11 is decreased, bending easily occurs, and a contact area between the friction pad press part 11 and a friction pad is reduced. Thereby, when a return force is exerted on the friction pad after release of brake operation, the friction pad is easily separated away from a disc rotor, and a drag threatening with occurrence in conventional arts does not occur.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disc brake used in a vehicle.

[0002]

2. Description of the Related Art As an example of a conventional disc brake,
Friction pads having a pair of ears protruding in a direction orthogonal to the axis and diameter of the disc rotor are arranged on both sides of the disc rotor, and the friction pads are provided in pairs corresponding to the positions of the pair of ears. And a substantially plate-shaped base portion that straddles the pair of friction pads, and a substantially plate-shaped torque receiving surface portion that extends in the radial direction of the disk rotor from each of the end portions of the base portion,
A recess provided in the middle of the torque receiving surface for recessing in the protruding direction of the ears and extending in the axial direction of the disc rotor for accommodating and mounting the ears to guide the friction pad in the axial direction of the disc rotor; A pad spring, which is formed by bending the torque receiving surface portion in a direction opposite to the concave direction of the concave portion and biases the friction pad outward in the radial direction of the disc rotor, is provided with a pad spring and the friction pad and the vehicle body side carrier. There is a disc brake interposed between the.

In this disc brake, the friction pad is moved and guided in the axial direction of the disc rotor in a state where the ears are placed in the recesses and the friction pad pressing portion urges the friction pad radially outward. The disc rotor is pressed to generate a braking force. At this time, the reaction force of the disc rotor is received by the carrier on the vehicle body side via the torque receiving surface portion and the like.

[0004]

By the way, it is desirable to appropriately separate the friction pad from the disc rotor after the braking action is released. In the above-mentioned prior art, however, the friction pad retainer has a constant set load (spring constant). Since it is rigid, the friction pad makes surface contact with the friction pad retainer regardless of the wear of the friction pad lining, so the friction pad cannot be easily separated from the disc rotor, and in some cases dragging occurs. There was a risk that it would end up.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a disc brake capable of easily separating the friction pad from the disc rotor.

[0006]

In order to achieve the above object, the present invention has a friction pad having a pair of ears protruding in a direction perpendicular to the axis and the diameter of the disc rotor disposed on both sides of the disc rotor. , A substantially plate-shaped base provided in pairs corresponding to the positions of the pair of ears and straddling the disk rotor and the pair of friction pads, and a radial direction of the disk rotor from each of the ends of the base. A substantially plate-shaped torque receiving surface portion that extends, and a shape that is provided in the middle of the torque receiving surface portion and that is recessed in the protruding direction of the ear portion and that extends in the axial direction of the disk rotor, stores and mounts the ear portion, and the friction pad serves as a disk rotor. And a friction pad pressing portion that is formed by bending the torque receiving surface portion in a direction opposite to the concave direction of the concave portion and urges the friction pad outward in the radial direction of the disc rotor. In a disc brake having a pad spring consisting of a pad spring interposed between a friction pad and a carrier on the vehicle body side, the disc rotor proximate side is left away from the disc rotor on the torque receiving surface portion side portion of the friction pad holding portion. It is characterized in that a notch that opens in the direction is formed. In this case, the axial length of the disc rotor at the portion of the friction pad retainer left behind is 1 / the axial length of the disc rotor at the portion away from the torque receiving surface with respect to the notch of the friction pad retainer.
It may be configured to have a size of 4 to 1/2.

[0007]

With this structure, the friction pad retainer is formed in the torque receiving surface portion of the friction pad retainer by forming a notch that opens on the side closer to the disc rotor in a direction away from the disc rotor while leaving meat. The spring constant of the portion becomes small and the portion easily bends to reduce the contact area with the friction pad. The axial length of the disc rotor in the portion of the friction pad retainer where the meat is left is 1/4 to 1 of the axial length of the disc rotor in the portion away from the torque receiving surface portion with respect to the notch of the friction pad retainer. /
By setting the dimension to be 2, the friction pad pressing portion is surely bent around the remaining portion, and the friction pad can be reliably separated from the disk rotor.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A disk brake according to an embodiment of the present invention will be described below with reference to FIGS. In the figure, friction pads 2 are arranged on both sides of the disc rotor 1. The friction pad 2 is composed of a lining 3 and a back plate 4. The back plate 4 of the friction pad 2 is formed with a pair of ears 5 protruding in a direction orthogonal to the axis and the diameter of the disc rotor 1. Between the friction pad 2 and the carrier 6 on the vehicle body side, a pair of pad springs 7 corresponding to the positions of the pair of ears 5 are provided.

The pad spring 7 is the disk rotor 1
And a substantially plate-shaped base portion 8 straddling the pair of friction pads 2,
A substantially plate-shaped torque receiving surface portion 9 extending in the radial direction of the disc rotor 1 from each end of the base portion 8 and a recess formed in the middle of the torque receiving surface portion 9 in the protruding direction of the ear portion 5 and of the disk rotor 1. A concave portion 10 for accommodating and mounting the ear portion 5 in a shape extending in the axial direction to guide the friction pad 2 in the axial direction of the disk rotor 1, and bending from the torque receiving surface portion 9 in a direction opposite to the concave direction of the concave portion 10. And a friction pad pressing portion 11 for urging the friction pad 2 formed radially outward of the disc rotor 1.

A notch 12 is formed in a portion of the friction pad pressing portion 11 on the side of the torque receiving surface portion 9 on the side closer to the disc rotor 1 and opens in a direction away from the disc rotor 1 leaving a flesh. The axial length m of the disc rotor 1 in the portion of the friction pad pressing portion 11 where the meat is left (hereinafter appropriately referred to as the notch forming portion 11a) is determined from the torque receiving surface portion 9 with respect to the notch 12 of the friction pad pressing portion 11. The size is set to 1/4 to 1/2 of the axial length n of the disc rotor 1 at the part (hereinafter, referred to as the pad pressing tip 11b as appropriate) to be distant.

In the disc brake constructed as described above, the ears 5 are placed in the recesses 10 and the pad pressing tip 11b of the friction pad pressing portion 11 rubs the friction pad 2 in the radially outward direction. The pad 2 is moved and guided in the axial direction of the disc rotor 1, and the friction pad 2 is brought into pressure contact with the disc rotor 1 to generate a braking force. At this time, the reaction force of the disc rotor 1 is received by the carrier 6 on the vehicle body side via the torque receiving surface portion 9 and the like.

A spring 12 of the friction pad pressing portion 11 is formed by forming a notch 12 in the portion of the friction pad pressing portion 11 on the side of the torque receiving surface portion 9 that opens on the side closer to the disk rotor 1 in the direction away from the disk rotor 1 leaving a flesh. The constant becomes smaller, and as shown in Fig. 4, it easily bends and the friction pad retainer
The contact area of 11 (pad pressing tip 11b) with the friction pad 2 is reduced. For this reason, when a returning force is applied to the friction pad 2 after the braking action is released, the friction pad 2 can be easily separated from the disc rotor 1, which may cause dragging which may occur in the above-described conventional technique. Absent. Since the length m of the notch forming portion 11a in the friction pad pressing portion 11 is set to 1/4 to 1/2 of the length of the pad pressing tip portion 11b, the pad pressing of the friction pad pressing portion 11 is performed. The tip portion 11b surely bends around the notch forming portion 11a, so that the friction pad 2 can be reliably separated from the disc rotor 1.

A wire V-shaped return spring (not shown)
Is inserted into a hole formed in the upper surface of the back plate 4 and is used together with the pad spring 7 to keep the upper and lower parts of the friction pad 2 away from the disc rotor 1 when the friction pad 2 is returned after the braking action. As a result, drag reduction can be performed more reliably.

According to Japanese Utility Model Laid-Open No. 3-41232, a pad spring is provided with a retainer portion for guiding the movement of the friction pad, and a part of the retainer portion is bent toward the disc rotor to press the second pad. A disc brake is shown forming a piece. In the disc brake of this publication, since the retainer portion itself is a rigid, there is a possibility that dragging may occur as in the above-described prior art. In contrast, in the present invention, as described above, the friction pad pressing portion 11 Is excellent because it does not easily bend and cause dragging.

[0015]

Since the present invention is the disc brake configured as described above, the friction pad pressing portion has a small spring constant by forming the notch on the torque receiving surface side of the friction pad pressing portion. Since it easily bends and the contact area with the friction pad becomes smaller, the friction pad can be easily separated from the disc rotor when the returning force to the friction pad is applied after the braking action is released, and the drag is not caused. . The axial length of the disc rotor in the portion of the friction pad holding portion where the meat is left is 1/4 to the axial length of the disc rotor in the portion away from the torque receiving surface portion with respect to the notch of the friction pad holding portion.
By setting the size to ½, the friction pad pressing portion surely bends around the notch forming portion, and the friction pad can be reliably separated from the disc rotor.

[Brief description of drawings]

FIG. 1 is a perspective view showing a pad spring of a disc brake according to an embodiment of the present invention.

FIG. 2 is a partially cutaway plan view showing the disc brake.

FIG. 3 is a partially cutaway front view showing the disc brake.

FIG. 4 is a view taken along the line AA of FIG.

[Explanation of symbols]

 1 Disc rotor 2 Friction pad 5 Ear 7 Pad spring 8 Base 9 Torque receiving surface 10 Recess 11 Friction pad retainer 12 Notch

Claims (2)

[Claims] 1. Friction pads having a pair of ears protruding in a direction orthogonal to the axis and diameter of the disk rotor are arranged on both sides of the disk rotor, and the friction pads are paired corresponding to the positions of the ears. A substantially plate-shaped base portion that is provided to straddle the disk rotor and the pair of friction pads, a substantially plate-shaped torque receiving surface portion that extends in the radial direction of the disk rotor from each end of the base portion, and a middle portion of the torque receiving surface portion. A recess that is recessed in the protruding direction of the ears and that extends in the axial direction of the disc rotor and that accommodates and mounts the ears to guide the friction pad in the axial direction of the disc rotor; and the recess from the torque receiving surface portion. The pad spring, which is formed by bending in the opposite direction to the concave direction of the disk, and which is configured to urge the friction pad outward in the radial direction of the disc rotor, is provided with a pad spring. In the disc brake interposed between the a and the disc, a notch is formed in a portion of the friction pad pressing portion on the side of the torque receiving surface portion that opens on the side closer to the disc rotor in a direction away from the disc rotor. Disc brake to do. 2. The axial length of the disc rotor in the portion of the friction pad retaining portion where the meat is left is the axial length of the disc rotor in the portion away from the torque receiving surface portion with respect to the notch of the friction pad retaining portion. The disc brake according to claim 1, which has a size of 1/4 to 1/2.