JPS6120336Y2 - - Google Patents

Description

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

BACKGROUND ART In recent years, reducing the weight of devices mounted on vehicles has become an important issue, and from this perspective, various improvements have been made to brake devices.

As one of such devices, the present applicant screws and fixes a pair of left and right slide pins through a support placed on one side of the disk, and a first slide pin on the opposite side of the disk. To provide a pin type disc brake having a simple structure in which an extending part of the brake pad is used as a supporting part for a caliper, and a second extending part extending across the outside of the disc diameter to the other side is used as a supporting part for a friction pad.

By the way, because of the simple structure of pin-type disc brakes with such a configuration, it is often necessary to use a slide pin to receive pressure from the brake torque generated on the friction pad, and for this reason, it is necessary to use a support for the slide pin. There is a need for strong fixing to the holder, and the present invention was developed from this perspective.

In other words, this type of slide pin screw fixing structure is
The slide pin is fixed through the support, and for positioning and firm tightening, it is common to have a tapered fitting part following the screw fitting part, and also to increase the bending rigidity of the slide pin. From above, the root portion of the slide pin is often made to have a large diameter. However, it has been found that increasing the diameter of the root portion of the slide pin does not necessarily work effectively in preventing deformation of the slide pin in combination with the tapered fitting portion. This is because when considering the torque pressure received during braking, the fulcrum position is the tapered part of the slide pin and the support through hole, and as the taper angle increases, the problem becomes even greater. .

In order to solve these difficulties, this invention positions the fitting relationship between the slide pin and the support through hole,
The tapered fitting part is necessary for strong tightening, the large diameter fitting part is located closer to the disk than the tapered fitting part so that it can serve as a fulcrum for receiving torque pressure during braking, and the fixing of these parts. A small-diameter screw fitting part is provided on the side farther from the disk than the tapered fitting so as to form a tapered fitting, and by obtaining the mutual effects of each of these fitting parts, a strong screw fixation is achieved. It is designed to obtain the following relationship.

The present invention will be explained below with reference to the drawings in comparison with a conventional example.

FIG. 1 shows a conventional example, in which 1 is a disk, 2 is a support extending in a bifurcated shape from the vehicle body fixing part on one side of the disk 1, 3 ₁ , 3 ₂ are through holes, 4 ₁ , 4
Reference numeral ₂ denotes a slide pin that penetrates through the through holes 3 ₁ and 3 ₂ and is screwed into the screw fitting portion 5 .
₁ , 5 ₂ and tapered fitting portions 6 ₁ , 6 ₂ in a screw-fixed relationship.

7 ₁ and 7 ₂ are extensions of the slide pins 4 ₁ and 4 ₂ that extend toward the opposite side of the disk 1, and the caliper 8, which is arranged to straddle the edge of the disk 1, is connected to the disk. It is supported to be slidable in the axial direction. Reference numerals 9 ₁ and 9 ₂ are second extending portions of the slide pins 4 ₁ and 4 ₂ toward the other side, which extend across the radial outer side of the edge of the disk 1 and connect the opposing pair of inner and outer friction pads 10 and 11. The disks are provided so as to be slidable in the axial direction, and to receive the torque during braking separately. That is, in this example, the pressure is received by the slide pins 4 _{1 or 4 2 on the left side in the figure on the inner side, and the slide pins 4 1} or 4 ₂ on the right side in the figure on the outer side. Further, the root portions of these second extending portions 9 ₁ and 9 ₂ are made thicker in diameter as shown in the figure.

Note that 12 ₁ and 12 ₂ are rubber bushes equipped with boot portions 13, which seal the first extending portions 7 ₁ and 7 ₂ of the slide pins 4 ₁ and 4 ₂ and the sliding portion of the caliper 8 from the outside air. ing.

In the above configuration, the slide pin 4
₁ , 4 ₂ and the through holes 3 ₁ , 3 ₂ of the support 2 are fitted into screw fitting portions 5 ₁ , 5 ₂ and subsequent tapered fitting portions 6 ₁ , 6 ₂ , and the above-mentioned brake torque The pressure-receiving fulcrums occur at the tapered fitting portions 6 ₁ and 6 ₂ .

FIG. 2 shows an enlarged view of the slide pin 4' and the threaded fixing portion of the support 2' through the through hole 3' in the present invention, and the other configurations are the same as those in FIG. 1.

In this example, the fitting part is composed of a small diameter screw fitting part 5', a tapered fitting part 6', and a large diameter fitting part 6'' following this. Therefore, when the brake torque is small, Since the slide pin 4' hardly deforms, the fulcrum for receiving torque pressure occurs at the tapered fitting part 6', but when the brake torque becomes large, the slide pin 4' undergoes primary deformation and the thick part of the slide pin 4' comes into contact with the through hole 3', so that the torque receiving pressure is supported by the large diameter fitting portion 6'', and the strength against deformation of the slide pin 4' is extremely advantageous.

As mentioned above, the pin type disc brake according to the present invention can effectively solve the problems of this type of pin type disc brake by improving the configuration which is relatively simple compared to the conventional one. The practical benefits are enormous.

In addition, in the case of a type in which the brake torque generated on both friction pads is received by only one of the slide pins, such a configuration may be limited to only the slide pin that receives the brake torque. Of course.

[Brief explanation of the drawing]

FIG. 1 is a plan view including a partial cross section of a conventional pin type disc brake, and FIG. 2 is a plan cross sectional view showing the structure of a slide pin fixing portion of the pin type disc brake according to the present invention. 1...Disk, 2...Support, 3 ₁ , 3 ₂
... Through hole, 4 ₁ , 4 ₂ ... Slide pin, 5
₁ , 5 ₂ ... Screw fitting part, 6 ₁ , 6 ₂ ... Taper fitting part, 7 ₁ , 7 ₂ ... First extension part, 8 ...
Caliper, 9 ₁ , 9 ₂ ... second extension part, 10 ...
Outer side friction pad, 11...Inner side friction pad, 12 ₁ , 12 ₂ ...Rubber button, 2'
...Support, 3'...Through hole, 4'...Slide pin, 5'...Screw fitting part, 6'...Taper fitting part, 6''...Large diameter fitting part, 7'... a first extension;
9'...Second extension part.

Claims (1)

[Scope of utility model registration request] A support extending in a bifurcated shape on one side of the disk, a pair of left and right slide pins that pass through this support and are screwed and fixed, and a portion of the slide pin that extends to the opposite side of the disk supports the disk shaft. The caliper is supported so as to be movable in the direction, and a pair of opposing friction pads are supported by the other extension of the slide pin to allow the disc to move in the axial direction, and are provided to receive torque during braking. In a pin type disc brake, the slide pin and support that receive the brake torque generated on the friction pad are screwed and fixed by a small diameter screw fitting part, a large diameter fitting part, and a tapered fitting part between these parts. 1. A pin type disc brake, characterized in that it is provided in a through-fitting structure consisting of the following, and the large-diameter fitting portion is located on the disc side.