JPS6344976B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a structure in which ears formed on both upper sides of a pad back plate are slidably provided on guide rails formed in a stepped manner on a bracket, and the pad is suspended so as to be guided in the disk axial direction. This relates to disc brakes.

The braking torque of conventional disc brakes using this kind of stepped pads is received by the torque receiving surfaces of the brackets that come into contact with the lower sides of the pad back plate located below the center of the cylinder during assembly, so the braking action is At times, the pads tend to float up, and a moment in the direction of rotation of the disc acts, adversely affecting the pad's grip on the disc, which in turn causes a reduction in brake feeling.

The present invention was invented in view of the above points, and has slits in the disk axial direction formed on the upper and lower sides of the ears, so that when the ears press against the torque receiving surface above the pad guide part of the bracket, A predetermined gap is created between the bottom of both sides of the pad back plate and the torque receiving surface below the pad guide of the bracket so that it can be easily elastically deformed to receive low braking torque by utilizing the break deformation of the ear part of the back plate. is provided, and the lower portions of both sides of the pad back plate are in contact with the torque receiving surface, so that torque of medium braking or higher can be mainly received,
Prevents brake squeal during low braking (common use range),
The purpose is to improve the brake feeling.

The illustrated embodiment will be described below.

First, an embodiment shown in FIGS. 1 and 2 will be described. 1 is a disk that rotates together with the wheel; 2 is a bracket that is fixed to the vehicle body with a fixing bolt; It has support arms 4, 4 which straddle the disk 1 by means of bridge parts 3, 3 on both sides, and pad guide parts 7, 7, on opposing surfaces of inner parts 5, 5 and outer parts 6, 6 of both support arms, respectively. 7, 7 are integrally formed in a step shape. 8 is a torque receiving surface provided above each pad guide portion 7, and 9 is a torque receiving surface provided below each pad guide portion 7.

10 is a carrier body in which an inner part 10b and an outer part 10c are integrally molded via a bridge part 10a.
A sliding pin 12 straddles the disk 1 and is fixed to the mounting parts 11, 11 on both sides, respectively.
a and 12b are slidably inserted into pin holes 13a and 13b formed in the support arms 4 and 4 of the bracket 2, respectively, and are supported so as to be movable in the disk axial direction relative to the bracket 2.

14, 14 are inner and outer pads arranged on both sides of the disk 1, and each pad 14
is equipped with a back plate 15, and ears 16, 16 are formed projecting from the upper portions of both sides of the back plate 15, respectively. The lower surfaces of the ears 16, 16 of the back plate 15 of the inner pad 14 are slidably engaged with the upper surfaces of the inner pad guide portions 7, 7 of the bracket 2, and the outer pad 14 similarly engages with the upper surfaces of the inner pad guide portions 7, 7 of the bracket 2. 7, 7 with the ears 16, and both pads 1
4 and 14 are suspended so that they can be moved in parallel in the disk axial direction. At this time, the side surface 16a of the ear portion 16 is provided so as to be in contact with the torque receiving surface 8, and a predetermined gap C is provided between the lower portions 15a on both sides of the back plate 15 and the torque receiving surface 9.

17a and 17b are slits formed in the upper and lower sides of the ear part 16 in the disc axis direction, and are elongated in the pad vertical direction.
The lower slit 17b is formed with a notch biased toward the torque receiving surface 8 side, and the ear portion 16 connects the torque receiving surface 8 above the pad guide portion 7 of the bracket 2. Ear part 1 when pressed
6 has a shape that easily deforms elastically due to low braking torque, and the reaction force of the torque is applied to the pad 14.
It has a shape that allows it to be transmitted so as not to make it stand out.

The width of the predetermined gap C provided between the lower portions 15a on both sides of the back plate 15 and the torque receiving surface 9 below the pad guide portion 7 is determined by the braking operation.
slides into contact with disk 1, and disk 1 is attached to pad 14.
The pad 14 moves toward the disk rotation side due to the force in the rotational direction, and the ear portion 16 on the disk rotation side of the back plate 15 pushes the torque receiving surface 8 and transmits a low braking torque. deforms elastically,
When the braking becomes medium or higher, the lower parts 15 on both sides of the back plate 15
The width is such that a can contact the torque receiving surface 9 and receive torque.

The positions and shapes of the slits 17a and 17b are not limited to those in the embodiment described above; for example, as shown in FIG. However, semicircular slits 17d and 17e may be formed above and below it, or any other shape that can be easily elastically deformed when transmitting low braking torque is preferable. It is desirable to have a shape that prevents the pad from lifting easily.

Further, it is better to use a spring material that is easily elastically deformable for the back plate.

18 is a pad spring, both pads 14,1
4, the upper ends of the back plates 15, 15 are pressed, and the lower surface of the ear portion 16 is pressed against the pad guide portion 7.

When the pad 14 is suspended from the pad guide part 7 of the bracket 2 by the ear part 16 of the back plate 15 in this way, the side surface 16 of the ear part 16 transmitting low braking torque
The center point 16b of the cylinder a is located above the center point O of the cylinder formed in the caliper 10, and the center point 15b of the lower side surface 15a of the back plate 15, which transmits medium or higher braking torque, is located below the center point O of the cylinder. It will be located.

Since the present invention is configured as described above, when braking torque is transmitted to the pad 14 by the braking action, the low braking torque is transmitted to the upper pad guide portion 7 through the ear portion 16 of the back plate 15. Receive on receiving surface 8,
When the braking torque is medium or higher, the ears are elastically deformed by the low braking torque and the predetermined gap C disappears, causing the lower parts 15a on both sides of the back plate 15 to come into contact with the torque receiving surface 9 below the pad guide part 7. You can receive it from the Lord.

As described above, the present invention receives low braking torque above the center of the cylinder, so there is no lifting of the pads at the initial stage of braking, prevents brake squeal during low braking, and improves brake feeling. The fixing part of the bracket is fixed by using the elastic deformation of the back plate tab (number A in Fig. 2).
Torque receiving surface (second
As shown in the figure, the distance _l2 between the lower torque receiving surface 9 and the fixed part A is shorter than the distance _l1 between the torque receiving surface 8 above the pad guide part 7 and the fixed part A of the bracket). Since the pad is mainly received by the pad, it is possible to suppress expansion of the bracket and prevent uneven wear of the pad.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing one embodiment of the present invention, and FIG.
The drawings are a sectional view taken from FIG. 1, and FIG. 3 is a front view of the pad showing another example of the slits in the ears of the back plate. 1 is a disk, 2 is a bracket, 7 is a pad guide section, 8 and 9 are torque receiving surfaces, 14 is a pad, 15
is the back plate, 15a is the lower part of both sides, 16 is the ear part, 16a
is its side surface, 17a, 17b, 17d, and 17e are slits, and 17c is a hole.

Claims (1)

[Claims] 1. In a disc brake in which ears formed on both upper sides of a pad back plate are slidably provided on a pad guide portion formed in a stepped shape on a bracket, and the pad is suspended so that the pad can be guided in the disk axial direction, the ears are Slits in the disk axial direction are formed on the upper and lower sides of the ears so that the torque receiving surface above the pad guide of the bracket is easily deformed when the torque receiving surface is pressed. A predetermined gap is provided between the pad and the lower torque receiving surface, low braking torque is received by the torque receiving surface above the pad guide, and medium braking torque or more is mainly received by the torque receiving surface below the pad guide. A vehicle disc brake characterized by the following features: