JPH0220499Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial field of application] In order to facilitate the replacement of brake pads, the invention uses a pad pin and a latch to hold the pads by hooking the shoulders on the disc insertion side and the disc rotation side. This paper relates to improvements in the braking performance of disc brakes.

[Conventional technology]

An example of a well-known disc brake in which the brake pads are held by pad pins and latches is shown in the third example.
It is shown in FIG. This disc brake is
Pad pins 2 and 2' facing in the disc axis direction are fixed facing each other to the inner part 1a and outer part 1b of the caliper 1 in which a brake piston (not shown) is installed, and the inner pad 3 and outer pad 3' are fixed to the two pins. 2 with semicircular grooves formed on the back plate of
While hooking one of the shoulders 3a, 3a',
On the opposite side of the disc rotation direction (usually this is the disc rotation side), a latch 4 is suspended between the inner part 1a and the outer part 1b, and the other shoulder of the pad back plate is attached to this latch. Part 3a, 3
A' is hooked up. Further, the latch 4, which is rotatable around the shaft 4a, has a latch bolt 5 at the front in the rotational direction.
is engaged to restrict rotation, and the braking force applied to the pad is transmitted to the caliper via the pad pins 2 and 2' on the disk rotation side, and via the latch 4 and latch bolt 5 on the disk rotation side, respectively. It's like this.

[Problems to be solved by the invention] In the brake described above, when the latch bolt 5 is removed and the latch 4 is rotated in the direction of the arrow in FIG. 3, the pads 2 and 2' can be pulled out in the direction of rotation of the disk. Excellent pad replaceability. Furthermore, since the pads can be replaced without moving the caliper at all, there is no need for a retreat space for the caliper when replacing the pads, and there is an advantage that it can be used even in places where it is difficult to secure a retreat space. However, in the past, latch support using latch bolts was performed only on one end surface side (inner side) of the disk, as seen in FIG. 4, resulting in the following problems.

The problem is that the braking force of the pair of pads is applied to the cantilever latch bolt, so the diameter of that bolt needs to be increased, and the braking reaction force is all transmitted to the inner caliper via the latch bolt, and Since a torsional load is applied to the latch bolt in the direction of the arrow in FIG. 4, the inner caliper must also be thicker at the latch bolt support point. For this reason, especially when the disk thickness is large and the contact area between the latch and the latch bolt is small, the weight and dimensions of the caliper increase, and the space for installing the caliper also increases.
The reality is that when designing a layout in a limited space, the effective area of the pads has to be reduced.

Therefore, as shown in Fig. 5, the latch bolt 5
It is considered that the latch 4 is suspended between the inner part 1a and the outer part 1b of the caliper, and the entire latch 4 is supported by the latch bolt, but this method requires a large space for pulling out the latch bolt, as shown by the chain line. However, in the actual brake mounting part, it is often impossible to secure such a space, so it is not practical.

The present invention has been made to solve this problem.

[Means for solving problems]

In order to eliminate the above problems, the present invention provides a disc brake in which the rotation of the latch is regulated by a latch bolt, in which the latch bolt is suspended between the inner part and the outer part of the caliper across the disc, and is divided into two in the longitudinal direction. Both of the split bolts are separably connected via a rotational torque transmission means.

In this way, the remaining half can be removed by simply pulling out about half of the latch bolt, so the rotation restriction of the latch can be released in about half the amount of space needed to remove it compared to when using a single long bolt.

In addition, since the latch bolt is supported at two points, it is possible to avoid the action of torsional loads, and the braking reaction force is also distributed and transmitted to the inner and outer parts of the caliper. The thickness can be small.

〔Example〕

An embodiment of the present invention is shown in the attached FIGS. 1 and 2. The figure shows only the main parts.

As shown in FIG. 1, the latch bolt 15 used in the brake of the present invention extends from the inner part 1a of the caliper 1 to the outer part 1b across the disc, and is divided into two pieces midway in the longitudinal direction. There is. Further, the inner split bolt 15a and the outer split bolt 15b are each threadedly connected to the caliper, and furthermore, at the split portion, the two are separably connected by the rotational torque transmission means 6.

The torque transmission means 6 has a square shaft protruding from the center of the split end face of one split bolt that fits into a square hole provided in the split end face of the other bolt and is inserted and removed freely. As shown in FIG. 2, the means may be one using a plurality of shafts, a clutch that engages concave and convex teeth, or the like. However, in either case, the outer side split bolt 15b is separated and removed from the inner side split bolt after the screw connection with the caliper is released, so its length l is calculated as the distance between the inner and outer of the caliper. It is necessary to set it smaller than L.

Note that if the diameter of the middle part (near the split part) of the latch bolt 15 is made thinner to make that part non-contact with the latch, the braking force transmission part from the latch to the latch bolt will approach the fulcrum of the latch bolt, that is, the threaded part. , it is possible to suppress the rotational moment of twisting the latch bolt to a smaller level.

〔effect〕

In the disc brake of the present invention described above, the latch bolt that restricts the rotation of the latch extends to the outer part of the caliper, is divided into two parts in the middle, and is separably connected, so that the space for pulling it out is small.

In addition, the braking force applied to the inner and outer pads is distributed and transmitted to the inner and outer parts of the caliper by the latch bolt, and since there are two support points, twisting of the latch bolt is also prevented. The caliper wall thickness at the support point can be reduced, making it possible to reduce the weight of the brake and increase the effective area of the pad.

Furthermore, a latch bolt with a thinner intermediate portion has the advantage that torsional loads can be kept to a smaller level.

[Brief explanation of the drawing]

Figures 1 and 2 are side views showing the latch bolt attachment part of the disc brake of the present invention, Figure 3 is a front view of a conventional disc brake to which the present invention is applied, and Figure 4 is a partially broken view of the disc brake. The plan view and FIG. 5 are side views showing the conventionally considered mounting state of the latch bolt. 1... Caliper, 1a... Inner part, 1b...
...Outer part, 2, 2'...Put pin, 3,
3'...Brake pad, 4...Latch, 6...
Torque transmission means, 15...Latch bolt, 15a
...Inner side split bolt, 15b...Outer side split bolt.

Claims (1)

[Scope of utility model registration request] Hook the two shoulder parts of the brake pad that holds the disc onto the pad pins fixed to the inner and outer parts of the caliper, and the latch whose rotation is regulated with a latch bolt, respectively, and hold them. The applied braking force is transmitted to the caliper, and when replacing the pads, remove the latch bolt and rotate the latch to the shoulder disengagement point. The split bolt is suspended between the inner part of the caliper and the outer part, and both split bolts are separably connected via a rotating torque transmission means, and the entire length of the outer split bolt is connected between the inner part of the caliper and the outer part. A disc brake characterized by being smaller than the distance between the parts.