JPH0416016Y2 - - Google Patents

Description

[Detailed Description of the Invention] a. Purpose of the Invention (Field of Industrial Application) The disc brake according to this invention is used for braking large vehicles such as trucks and buses.

(Prior Art) As a disc brake used for braking a large vehicle such as a truck or a bus, a structure as shown in FIGS. 2 and 3 is conventionally known. This conventional disc brake supports 1
The circular ring-shaped mounting part 2 is attached to the car's nut 3.
It is fixed to the nutcle 3 by screwing a bolt (not shown) into the screw hole 4, and the both ends are loosely engaged with the two pins 5, 5 horizontally suspended on the upper part of the support 1, and the inside and outside are connected. (Inside refers to the center of the car where the disc brake is installed, i.e., the right side in Figure 3, and outside refers to the outer edge of the car, i.e., the left side in Figure 3). is attached to the support 1, and pads 10, 10 located on both sides of the rotor 9, which is connected to the hub 7 by bolts 8 inserted into the hub 7 of the wheel, are attached to the piston 11 housed in the caliper 6 and one end of the caliper 6. A lining 13 attached to a back metal 12 of the pad is pressed onto the rotor 9 by a piston 11 pushed out by hydraulic pressure.

The support 1 includes a support to support the weight of the pad 10, support the braking torque that acts on the pad due to friction between the side surface of the rotor and the lining 13 during braking, and guide the movement of the pad in the inward and outward directions. A guide groove 15 is provided in a protrusion 14 that protrudes downward from the peripheral wall 17 of the pad 1, and a protrusion 16 of the back metal 12 is engaged with the pad to support the pad and to make the support 1 bear the torque. .

When the lining 13 of the pad 10 of such a disc brake becomes worn and it becomes necessary to replace the pad 10, the pair of pins 5, 5
The pad 10 can be removed from the support 1 by removing one of the pins 5 and rotating the caliper 6 upwards around the other remaining pin 5. 20Kg
degree) The pad 10 can be easily replaced without raising or lowering the caliper 6.

(Problems to be Solved by the Invention) However, in the case of the conventional disc brake constructed and operated as described above, the following disadvantages occur.

That is, the pins 5, 5 which displace the caliper 6 in the front and back directions in FIG. However, the peripheral wall 17 is connected to the brake torque (the side surface of the rotor 9 and the lining 1) that the protrusion 14 receives during braking.
A force applied in the rotational direction of the rotor 9 that is generated based on friction with the rotor 3. ), the pins 5, 5 supported on this peripheral wall 17 are also affected by this deformation, which may cause poor sliding of the caliper 6 or, in severe cases, cracks in the pin 5. It ends up.

In order to solve this problem, as shown in FIGS. 4 and 5, pins 18 and 19 for displaceably attaching the caliper 6 to the support 1 are attached to the inner surface 9a of the rotor 9 of the support 1. The pins 18 and 19 are screwed into the screw holes 20 and 21 that have been deformed in both the inside and outside directions on the part that is closer to the inside (upper side in Figure 4) to prevent displacement of the pins 18 and 19 due to brake torque. That is what is being considered.

That is, a pair of screw holes 20 and 21 are formed in both end portions of the support 1 located inside the inner surface 9a of the rotor 9, extending from the inside to the outside of the support 1. By screwing together and tightening the screw portion formed at the base end of the pin 18 and the screw portion formed at the base end of the other pin 19 into the other screw hole 21, each pin 18,
19 is fixed.

Cylindrical guide tube portions 23 and 23 provided at both ends of the caliper 6 are fitted onto these two pins 18 and 19 via sleeves 22, respectively.
Attach nut 2 to the threaded part formed at the tip of 8 and 19.
4 and 24, and the guide cylinder portions 23 and 23 are screwed together.
Each pin 18, 19 is prevented from slipping out from inside.

By determining the mounting position of the caliper guide pin of the disc brake as described above, displacement of the caliper guide pin due to brake torque during braking can be sufficiently prevented. Or 18) is the guide cylinder part 23
If you want to pull it out from the inside of the disc brake, remove the nut 24 located at the inner end of the disc brake, then remove the pin 1.
9, remove the threaded part formed at the base end of the pin 19 from the screw hole 21 of the support 1, and remove the threaded part formed at the base end of the pin 19.
9 is pulled out from the guide cylinder portion 23 and screw hole 21.

However, removing the nut 24 located at the inner end is troublesome and causes a deterioration in the efficiency of pad replacement work.

The disc brake of the present invention eliminates all of the above-mentioned disadvantages.

b. Structure of the invention (Means for solving the problem) The disc brake of the invention, like the conventional disc brake described above, uses a support that is fixed to the vehicle body inside the rotor that rotates together with the wheels to guide the movement of the caliper. The rotor is attached via a pair of pins, and a pair of pads located facing each other on both the inner and outer surfaces of the rotor are crimped onto the rotor using a caliper, thereby braking the wheels via the rotor. There is.

Furthermore, in the disc brake of the present invention, at least one of the pair of pins is
It is inserted from the outside into a screw hole formed in the inner and outer directions in a portion of the support closer to the inside than the inner surface of the rotor, and its base end is screwed into the screw hole and fixed. A cylindrical guide portion with a bottom and a closed inner end extending in the inner and outer directions is fixed to the caliper, and this guide tube portion is slidably fitted onto the one pin.

(Function) Since the disc brake of the present invention is constructed as described above, when replacing the pads,
By rotating one of the pins inserted inside the bottomed cylindrical guide tube from the outside, the base end of this pin is removed from the screw hole, and the pin is pulled out from the guide tube. be able to.

After pulling out one pin, the caliper is rotated upward about the other pin, and the pads supported on the support are replaced, as in the case of conventional disc brakes.

Further, since the pin is inserted from the outside into a screw hole located inside the inner surface of the rotor and screwed into the screw hole, the pin does not straddle the rotor. When the pin straddles the rotor, the head of the pin, which is screwed into the screw hole from the outside,
Since it comes into contact with the inner surface of the wheel that is mounted over the disc brake, to avoid this, the wheel diameter must be made smaller and the pin moved closer to the rotor shaft, which weakens the braking force.
In the present invention, such a problem does not occur.

(Example) Next, the present invention will be explained in more detail while explaining the illustrated embodiment.

FIG. 1 is a partial cross-sectional plan view showing an embodiment of the disc brake of the present invention. Similar to the conventional disc brake described above, this disc brake has a caliper 6 attached to a support 1 which is fixed to the vehicle body inside a rotor 9 that rotates together with the wheels, through a pair of pins 18 and 19 for guiding the movement of the caliper 6. A pair of pads 10 (only the outer pads are shown in FIG. 1) located opposite to each other on both the inner and outer sides of the rotor 9 are pressed onto the rotor using the caliper 6. The wheels are then braked.

The pair of pins 18 and 19 are located inside the inner surface 9a of the rotor 9 of the support 1 (the first
The threads formed at the base end of each pin are screwed into the screw holes 20 and 21 formed at both ends of the part closer to the top in the figure, and tightened to fix it to the support 1. There is. Each pin is installed without straddling the rotor.

Of the pair of pins 18 and 19, one pin 19 is fixed to the caliper 6 via a sleeve 22, and has a bottomed cylindrical guide tube extending in the inner and outer directions with the inner end closed. The portion 25 is fitted onto the outside. pin 1
A thread for screwing a nut is not formed at the tip of 9. A dust-proof boot 26 is installed between the open end of the guide tube 25 and the outer end of the sleeve 22, so that the guide tubes 2 slide into sliding contact with each other during braking.
Dust is prevented from entering between the inner circumferential surface of the sleeve 5 and the outer circumferential surface of the sleeve 22.

Pin 18 for supporting the other end of the caliper 6
The engaging portion between the guide tube portion 23 and the guide cylinder portion 23 is the fourth to
The structure is similar to that shown in FIG. Guide cylinder part 23
Dust-proof boots 26, 26 are attached to both the inner and outer ends of the inner and outer ends.

The action of the disc brake of the present invention constructed as described above during braking is exactly the same as that of the conventional disc brake explained with reference to FIGS. 2 and 3, but when replacing the pads,
By pulling out one pin 19 inserted into the bottomed cylindrical guide tube part 25 only from the outside, the pad 10 can be easily replaced.

That is, as specifically shown in FIG. 6, the pin 19 has a bolt-shaped head 27 integrally formed with a flange at its base end, and the rod-shaped pin main part 19a and the head 27 are connected to each other. Since a threaded portion 28 having a larger diameter than the pin main portion 19a is formed between the pins, when replacing the pad, one of the pins inserted inside the guide tube portion 25, which is a cylindrical shape with a bottom, By engaging the head 27 of the pin 19 with a spanner and rotating the pin 19 from the outside, the base end of the pin 19 is removed from the screw hole 21, and the pin 19 is pulled out from the guide tube.

After the pin 19 is extracted in this way, the caliper 6 is rotated upward around the other pin 18, and the pad 10 supported on the support 1 is replaced, as in the case of a conventional disc brake. .

After completing the pad replacement work, rotate the caliper 6 downward to align the opening of the guide tube 25 fixed to the caliper 6 with the screw hole 21 provided in the support 1, and then open the screw hole 21 from the outside. The pin 19 that has been passed through is inserted into the guide tube portion 25, and the threaded portion at the proximal end of the pin 19 is screwed into the screw hole 21 and tightened.
These operations can be easily performed without having to reach into the narrow spaces between the vehicle and the vehicle body.

c. Effects of the invention Since the disc brake of the invention is configured and operates as described above, it not only prevents caliper sliding failure and pin cracking caused by the brake torque generated during braking, but also facilitates pad replacement work. You will be able to do this.

Furthermore, since the pin does not cross the rotor, there is no need to reduce the rotor diameter to prevent the pin head from contacting the inner surface of the wheel, which is advantageous for maintaining a large braking force.

[Brief explanation of the drawing]

Fig. 1 is a partial cross-sectional plan view showing an embodiment of the disc brake of the present invention, Fig. 2 is a front view showing an example of a conventional disc brake, and Fig. 3 is A of Fig. 2.
-A sectional view, Fig. 4 is a view similar to Fig. 1 showing a partially improved disc brake, Fig. 5 is a view seen from below Fig. 4, and Fig. 6 is a side view of the pin 19. . 1... Support, 2... Mounting part, 3... Nutcle, 4... Screw hole, 5... Pin, 6... Caliper, 7... Hub, 8... Bolt, 9... Rotor,
9a...inner surface, 10...pad, 11...piston, 12...back metal, 13...lining, 14
... Protrusion, 15 ... Guide groove, 16 ... Protrusion, 17
... Peripheral wall, 18, 19 ... Pin, 19a ... Pin main part, 20, 21 ... Screw hole, 22 ... Sleeve, 23 ... Guide cylinder part, 24 ... Nut, 25
...Guide tube portion, 26...Boot, 27...Head, 28...Threaded portion.

Claims (1)

[Scope of utility model registration request] A support that is fixed to the vehicle body inside the rotor that rotates with the wheels has a support that guides the movement of the caliper.
A disc brake is installed through a pair of pins, and brakes a wheel via the rotor by pressing a pair of pads, which are located opposite both the inner and outer surfaces of the rotor, to the rotor using a caliper. The pins do not straddle the rotor but are located inside the rotor, and at least one of the pair of pins is located in a portion of the support that is closer to the inside than the inside surface of the rotor in the inside-outside direction. It is inserted into the formed screw hole from the outside, and its base end is screwed into this screw hole and fixed, and fixed to the caliper.
A disc brake characterized in that a bottomed cylindrical guide tube portion extending from inside to outside and whose inner end is closed is slidably fitted onto one of the pins.