JPS6336178Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of a pin type disc brake.

In general, pin-type disc brakes have a configuration in which a pair of opposing friction pads is pressed against the rotor to obtain braking force by a caliper supported movably in the axial direction relative to the rotor, and the caliper is a fixed part of the vehicle body. A sliding support device that movably supports a support is composed of a sliding assembly of a slide pin and an opening that slide relative to each other between the support and a caliper, and the sliding surface has a circumferential shape. This is known as having the advantage that the sealing structure from the outside can be easily achieved by attaching a cylindrical boot.

By the way, even with pin-type disc brakes having such a configuration, especially in brake devices applied to large vehicles, the weight of the device itself becomes large, and the torque generated during braking is also quite large, resulting in increased friction. It goes without saying that it is desirable to make the sliding surface as long as possible in order to stabilize and accurately guide the caliper in the sliding direction in order to prevent pad wear and to prevent the pad from dragging when the brake is not on.

From this point of view, for example, it is possible to fix both ends of a slide pin to a pair of bosses that protrude toward the sides of the caliper, which are formed apart in the rotor axial direction, and to slide the middle part of this slide pin into a through opening formed in the support. There are also products that are designed to encourage you. However, even with such a configuration, the length of the sliding surface is essentially limited by the axial length of the through opening, so there is a problem that an increase in this length tends to lead to an increase in the size and weight of the device. Therefore, in the present invention, stabilizing the caliper sliding guide direction does not require a long sliding surface that slides over the entire length. If the relative degree of freedom in the radial direction of the pair of left and right sliding parts, which is essential for
Focusing on the fact that the angle at which the shaft body can tilt within this degree of freedom can be reduced by increasing the shaft length, we decided to increase the shaft length, which is involved in regulating this relative tilt, by increasing the shaft length. We developed a pin-type disc brake in which a pair of protruding bosses spaced apart in the axial direction of the rotor slide against both ends of a slide pin fixed to a support in the middle.
This is what we provide. That is, the features of the present invention provided to achieve the above-mentioned object are to support each of a pair of opposing friction pads arranged with the rotor in between so as to be movable in the axial direction of the rotor, and to straddle the edge of the rotor. and a pair of through screw holes formed in the support so as to be spaced apart in the rotor axial direction and spaced apart in the rotor circumferential direction at the rotor radial outer position of this support. , are screwed through and fixed, and have a first sliding part and a second sliding part on both sides of the rotor, respectively.
A pair of slide pins provide a sliding portion, and four slide pins are provided so as to straddle the rotor and press the pair of opposing friction pads against the rotor, and are spaced apart in the rotor circumferential direction and the rotor axial direction. a caliper in which four protruding boss openings are formed, and the caliper is configured to rotate the rotor by slidingly engaging the four boss openings with the first sliding part and the second sliding part of the pair of slide pins. The slide pin is configured to be supported movably in the axial direction, and the slide pin is inserted into the through screw hole of the support from the inner side, and the tip portion protruding from the through screw hole toward the outer side is connected to the boss portion of the caliper. The opening constitutes a first sliding part that is slidably fitted, and a cylindrical rigid sleeve is fitted to the inner side of the slide pin, and this rigid sleeve is tightened and fixed between the support and the head of the slide pin. The second sliding portion is configured by the outer circumferential surface of the rigid sleeve.

The present invention will be described below based on embodiments shown in the drawings.

In the figure, reference numeral 1 denotes a support, which is disposed so as to straddle one edge of a rotor (not shown) and is bolted to a nutcle 2 that is fixed to the vehicle body. The support 1 of this example is provided on both sides of the rotor so as to have a concave opening radially outward from the rotor, and the arm portions 3, 3 that span the rotor on both the left and right sides are provided with a recess at a position radially outward from the rotor. A screw hole 4 is formed that passes through the rotor in the axial direction.

Reference numerals 5 and 5 designate a slide pin that is screwed and fixed through the screw hole 4 of this support 1, and has a threaded portion 6 in the middle of the shaft and a first sliding portion 7 with a small diameter on the insertion tip side.
It consists of a second sliding part 8 on the rear end side of the insertion, and a hexagonal bolt head 9 that engages with the screw fixing jig at the rearmost part, and in this embodiment, the second sliding part 8 has a rigid The sleeve 10 is fitted and fixed so as to form a substantial second sliding part. 11 is a spring washer.

Reference numeral 12 denotes a caliper disposed so as to straddle the edge of the rotor, and one of the pair of legs 13 and 14 facing each other with the rotor in between is provided with a pair of left and right calipers.
A built-in hydraulic cylinder device is provided to press the inner side friction pad (to be described later) against the rotor. It is provided so that when the caliper 12 slides in the inner direction, an outer friction pad (to be described later) is brought into pressure contact with the rotor.

The inner friction pad 25 and the outer friction pad 26 are supported by the left and right arms 3, 3 of the support 1, respectively, so that the left and right sides thereof can move in the rotor axial direction.

On both left and right sides of the caliper 12,
a pair of openings 15, each spaced apart in the rotor axial direction;
Boss portions 17 and 18 having 16 are formed protrudingly,
The openings 15 and 16 are slidably fitted to the first sliding portion 7 of the slide pin 5 and the rigid sleeve 10, thereby supporting the rotor so as to be movable in the axial direction. Note that in this embodiment, the openings 15 and 16
Rubber bushes 19 and 20 are attached to the inner surfaces of the rubber bushes 19 and 20, and the inner surfaces of the rubber bushes 19 and 20 are provided so as to slide together with slide pins, etc., and there are sliding surfaces from both ends of the rubber bushes 19 and 20. Boot portions 21, 22, 23, 24 that seal the
are formed to extend respectively.

According to the above configuration, the sliding guide direction of the caliper 12 is given by the first sliding portion of the left and right slide pins 5 and the rigid sleeve, and the outermost ends of these in the rotor axial direction are substantially This is determined by the formation position of the protruding boss portions 17 and 18 of the caliper 12, and the sliding length has been made significantly longer than that conventionally limited to the range of the thickness of the support. Therefore, the relative tilting angle of the caliper openings 19, 20 and the slide pin 5 is greatly reduced, which is an advantage.
The accuracy of the caliper sliding guide direction for a brake device of the same size has been greatly improved.

As described above, the pin type disc brake according to the present invention can provide a large disc brake with a highly accurate structure that can stabilize the sliding direction of the caliper with a configuration with a small number of parts. Moreover, since the support receives the support of the brake torque generated in the friction pad, there is less influence from tilting of the slide pin, etc., and there is an effect that sliding guidance of the caliper can be performed with higher precision. Further, by tightening the rigid sleeve between the slide pin head and the support, the slide pin can be reliably positioned in the axial direction, and sagging after assembly can be prevented.

[Brief explanation of the drawing]

The drawings show an embodiment of the pin type disc brake according to the present invention, in which Fig. 1 is a plan view including a partial cross section, Fig. 2 is a front view of the same, Fig. 3 is a rear view of the same, and Fig. 4 is a plan view including a partial cross section. The figure is a longitudinal side view of the same. 1: Support, 2: Natsukuru, 3: Arm, 4:
Screw hole, 5: Slide pin, 6: Threaded part, 7: First sliding part, 8: Second sliding part, 9: Bolt head, 1
0: Rigid sleeve, 11: Spring washer, 12: Caliper, 13, 14: Leg, 15, 16: Opening, 1
7, 18: Boss part, 19, 20: Rubber button,
21, 22, 23, 24: Boot part, 25, 2
6: Friction pad.

Claims (1)

[Scope of utility model registration request] A support that supports each of a pair of opposing friction pads with the rotor in between so as to be movable in the axial direction of the rotor, and is arranged and fixed across the edge of the rotor; The support is screwed and fixed to a pair of through screw holes formed in the support in the rotor axial direction and spaced apart in the rotor circumferential direction. and a pair of slide pins that provide a second sliding portion, which are disposed so as to straddle the rotor and press the pair of opposing friction pads against the rotor, and are spaced apart in the rotor circumferential direction and the rotor axial direction. and a caliper formed with four protruding boss openings, the caliper having the four boss openings slidingly engaged with the first sliding part and the second sliding part of the pair of slide pins. The slide pin is inserted into the through screw hole of the support from the inner side, and the distal end protruding from the through screw hole toward the outer side is connected to the caliper. A cylindrical rigid sleeve is fitted to the inner side of the slide pin, and this rigid sleeve is tightened and fixed between the support and the head of the slide pin. A pin type disc brake, characterized in that the second sliding part is formed by the outer peripheral surface of the rigid sleeve.