JPH0223865Y2 - - Google Patents

Description

[Detailed description of the invention] (Industrial field of application) This invention relates to a pin slide type disc brake device used in vehicles, etc., and in particular, even if the bolt for fixing the pin is unscrewed, the bolt remains in the caliper. Or it relates to an improved technology that prevents the device from falling off the mounting bracket.

(Prior Art) Generally, in a pin slide type disc brake device, a caliper is guided slidingly by a pin, and the sliding part around the pin is completely protected by a boot. Therefore, this type of disc brake device has an advantage over other caliper floating type devices in that the sliding portion is less susceptible to the effects of muddy water, dirt, and the like.

By the way, the boots that protect the sliding parts are usually arranged symmetrically on both sides of the caliper, and one end of the boots is attached to a mounting groove provided on the outer periphery of the pin.
Each attachment part is sealed when installed. Generally, the pin is made up of a bolt and a cylindrical sleeve surrounding the outer periphery of the bolt, and the sleeve is fixed by the bolt. Regarding the above, for example,
No. 71536, Utility Model Publication No. 55-63436, or Japanese Patent Application Publication No. 1983
-Described in each publication No. 157833.

(Problems to be solved by the invention) In the conventional technology mentioned above, since a mounting groove for attaching the boot is provided on the outer periphery of the pin, the strength of the pin is reduced or the pin The problem of complicating the shape of the
There is a problem in that the boot mounting part cannot be reliably sealed, and dirt and the like may adhere to the internal sliding part. In particular, the internal air of a pair of boots is
As the caliper reciprocates, one side is compressed and the other side is in a vacuum state, and the pumping action caused by this repetition makes it easy to suck dirt etc. into the boot. , it is considered that a more reliable method should be adopted.

Another problem is that the bolts used to fix the pins can be completely removed, so there is a problem of losing the bolts or having foreign matter adhere to the threaded surfaces of the bolts during maintenance. be. Foreign matter can cause the pins to become out of parallel, so you should try to avoid them as much as possible.

This invention aims to improve the strength by simplifying the shape of the pin, as well as technology that can reliably seal the mounting part of the boot, and furthermore, it is possible to unscrew the bolt for fixing the pin. The object of the present invention is to provide a technique that prevents bolts from completely coming off from the mounting portion even when the bolts are attached.

(Means for solving the problem) In this invention, while the sleeve is kept in a simple cylindrical shape, a plate ring-shaped fixture is used to attach the boot, and the fixture is used to apply the tightening force of the bolt. The clamping force is used to secure the boot by clamping it, and the sealing performance of the boot attachment part is also achieved by the clamping force. Furthermore, the inner diameter of the plate ring-shaped fixture and the outside diameter of the non-threaded portion of the bolt shaft into which the fixture is fitted are set smaller than the outer diameter of the effective threaded portion of the bolt. .

(Function) A simple cylindrical sleeve is extremely advantageous in terms of strength. In addition, since the tightening force from the bolts applied to the plate ring-shaped fixture is used to obtain the sealing force of the boot mounting part, the sealing of the boot mounting part is achieved despite the above-mentioned pump action, etc. It can be done reliably. Furthermore, since the outer diameter of the effective thread of the bolt is larger than the inner diameter of the plate ring-shaped fixture, when the screw is removed, the end of the effective thread of the bolt will be pulled against the inner peripheral edge of the fixture. It gets stuck and never comes off completely.

(Example) FIG. 1 shows a partially sectional structure near one sliding part. FIG. 2 is a plan view of an embodiment of this invention, and FIG. 2 is an enlarged view of the main parts showing the attachment part of the boot.

First, in FIG. 1, a disc rotor 10 that rotates together with the wheels is shown by a chain line, and friction pads 12 and 14 are disposed on both sides of the disc rotor 10 so as to be able to press against the sides of the disc rotor 10, respectively. These pair of pads 12, 14 are back metals 12a, 14a.
The disc rotor 10 is fixed to the disc rotor 10, and is supported movably in the axial direction of the disc rotor 10 by a mounting bracket 16, which is a base member, via its back metal. The mounting bracket 16 itself is fixed to a non-rotating part of the vehicle body. Each pad 12, 14 on either side of the disk rotor 10 is connected to a caliper 18 that moves relative to the mounting bracket 16.
The brake force is applied to the disc rotor 10 to generate a braking force. The caliper 18 includes a main body portion 181 that crosses over the disk rotor 10 and the pair of pads 12 and 14, and a back metal 12 that holds each pad 12 and 14 from each end of the main body portion 181.
A pair of leg portions 18 extending on the back surfaces of a and 14a, respectively.
2, 183, and a pair of arm portions 184, 185 for pin sliding. One leg 182 of the caliper 18 has a built-in cylinder device 20 operated by hydraulic pressure. This cylinder device 20 can press one pad 12 directly toward the disk rotor 10 via the back metal 12a,
The other pad 14 is pressed against the other surface of the disc rotor 10 via a caliper 18 moved by a reaction force.

The person who guides the movement of Calipa 18 is
This is the pin part A. There are usually two pin parts A.
The two pin portions A are connected to the arm portions 184 and 18 in order to smoothly slide and guide the caliper 18 without tilting it.
5 is arranged so as to have a sufficient span at the tip. Therefore, the arm portion 18 of the caliper 18
A through hole 22 extending along the axial direction of the disc rotor 10 is provided at the tip of each of the disc rotors 4 and 185.
A pin 24 is slidably fitted into each through hole 22, and as described above, each pin 24 consists of a cylindrical sleeve 26 and a bolt 28 passing through the inside of the sleeve 26. The bolt 28 has an unthreaded non-threaded portion 28a passing through the sleeve 26, and a male threaded portion 28b at one end screwed into a threaded hole 29 on the mounting bracket 16 side. side circumference and bolt head 2
8c. The bolt head 28c has a large diameter flange 2 at a portion facing the end surface of the sleeve 26.
It has 8d. Here, in this invention, bolt 2
The outer diameter of the non-threaded portion 28a of No. 8 is made smaller than the inner diameter of one of the plate ring-shaped fixtures 30 described below, while the effective threaded portion 28b consisting of a male threaded portion.
The outer diameter of the fitting 30 is set slightly larger than the inner diameter of the same fixture 30. Therefore, typically for the fixture 30, the effective threads 28 of the bolt 28
Prior to forming b, the bolt 28 is fitted onto the shaft portion of the bolt 28 in advance. However, after forming the effective threaded portion 28b, the fixture 30 is attached to the effective threaded portion 28b.
It is also possible to fit it into the non-threaded portion 28a while rotating it along the thread. Note that when the bolt 28 is unscrewed, the head 28 of the bolt 28
In consideration of reducing the protrusion amount on the c side, it is preferable to set the axial length of the effective threaded portion 28b to be relatively large.

Next, a plate ring-shaped fitting 30, 32 is arranged at each end of the simple circular tube-shaped sleeve 26, and each of these fittings 30, 32 also has a bolt 28.
It is fixed by the tightening force of . Here also, each boot 34,
One end 34a, 36a of 36 is mounted and supported, and the sealing of the mounting portion is ensured.
Note that the other ends 34b, 36b of each boot 34, 36
are fitted into mounting grooves 184a, 185a provided on the arm portions 184, 185 side of the caliper 18 and are supported.

As for each fixture 30, 32, the basic construction is substantially the same at one end of the sleeve 26 and at the other end. That is, each fixture 3
0 and 32 are ring parts 30b and 32b which have the same shape as the end surface of the sleeve 26 and have bolt holes 30a and 32a formed in the center, and each ring part 3.
0b, 32b by a distance l in the axial direction of the bolt 28 or pin 24.
c, 32c, a connecting portion 3 that connects each boot mounting portion 30c, 32c and each ring portion 30b, 32b.
It consists of 0d and 32d. Here, each fixture 3
Thick end portions 34a, 36a of each boot 34, 36 are attached to the boot attachment portions 30c, 32c of No. 0, 32, and each end portion 34a, 36a is attached to each attachment tool 30, 32. In the state, end face 3
4c and 36c are the ring parts 3 of the fixtures 30 and 32
It protrudes slightly toward the bolt head 28c or mounting bracket 16 side from one surface of 0b, 32b. Therefore, by tightening the bolt 28, the boot end surfaces 34c, 36c elastically come into close contact with the bolt head 28c and the opening side circumference of the screw hole 29 on the mounting bracket 16 side, thereby ensuring a reliable seal. is increasing. In addition, the boot attachment part 30c of the fixture 30 on the side of the bolt head 28c has a portion 3 perpendicular to the axis of the bolt 28.
0e and the part 3 running in the same direction as the axis of the bolt 28
0f, and the latter part 30f is the boot 34
This makes the connection between the and the fixture 30 stronger and more reliable. When the bolt 28 is unscrewed, the load of the bolt 28 is applied through the fixture 30 towards the boot 34, but the strong connection is maintained by the unscrewed bolt 28.
This is preferable in terms of supporting. Of course, the configuration of each fitting 30, 32 at both ends of the sleeve 26 could be identical, so that the parts are unified.

Further, in the illustrated embodiment, the bolt 28 is fixed to the mounting bracket 16 side, but it can also be fixed to the caliper 18 side and the sliding portion is provided on the mounting bracket 16 side. In addition, as a material for each fixture 30, 32, a metal material such as a steel plate or spring steel can be used.

(Effect of the invention) According to this invention, one end 3 of the boots 34, 36
Since the plate ring-shaped fixtures 30 and 32 are used to attach and support the pins 4a and 36a, the shape of the pin 24 can be simplified and its strength improved, and the seal of the boot attachment part can be improved. You can increase your sexuality. Furthermore, bolt 28
The outer diameter of the effective threaded portion 28b is made larger than the inner diameter of the plate ring-shaped fixture 30, so even if the screw is removed, the bolt 28 will remain in the effective threaded portion 28b.
The end 28e of the fitting 30 is caught on the inner circumferential edge 30g of the fixture 30, and does not come off completely. Therefore, the problem of missing bolts 28 or adhesion of foreign matter can also be effectively solved.

[Brief explanation of the drawing]

Figure 1 is a plan view showing a partially cross-sectional structure;
The figure is an enlarged view of the main parts. 10... Disk rotor, 12, 14... Pad, 16... Mounting bracket (base member), 18... Caliper, 20... Cylinder device,
22...Through hole, 26...Sleeve, 28...Bolt, 28a...Non-threaded part, 28b...Effective threaded part, 28c...Head, 29...Threaded hole, 30,3
2... Attachment, 34, 36... Boots.

Claims (1)

[Scope of utility model registration request] A pair of pads are disposed so as to be able to be press-contacted on each side of a disc rotor that rotates with the wheels, and the pair of pads are supported movably in the axial direction of the disc rotor and are fixed to a non-rotating part of the vehicle body. a base member, a caliper disposed straddling the pair of pads and the disc rotor; and a caliper provided on one leg of the caliper to direct one pad directly to the other pad through the caliper to the disc rotor. A pressable cylinder device, a screw hole provided in one of the caliper and the base member, a through hole provided in the other, a cylindrical sleeve slidably fitted into the through hole, and a cylinder penetrating the sleeve. a bolt that is screwed into the screw hole and fixes the sleeve between the opening side circumference of the screw hole and the head, and each end of the sleeve and each opening of the through hole; a pair of boots respectively disposed on the sides of the bolt; a plate ring-shaped fixture is fitted to the head-side end of the head-side boot of the bolt of the pair of boots; In the disc brake device which is clamped and fixed between the head and the sleeve, the inner diameter of the mounting tool and the non-threaded portion on the head side of the shaft of the bolt into which the mounting tool is fitted. A disc brake device in which the outer diameter of the bolt is smaller than the outer diameter of the effective threaded portion of the bolt.