JPS6236983Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a piston return device suitable for disc brakes, particularly for opposed type disc brakes.

When replacing the pads of a disc brake, it is necessary to push the piston that fits into the cylinder of the caliper body back into the cylinder to the position before the pads were worn out. For floating caliper type disc brakes, this work can be done relatively easily by forcibly sliding the caliper body and pressing the piston with a pad back metal. Conventionally, brakes have been made by inserting the tip of a screwdriver or the fork of a special tool between the caliper body and the piston, and using the caliper pub as a fulcrum to push the piston by a so-called lever action. Yes, but it is difficult. In particular, it is increasingly difficult to push back the piston of a large-sized opposed disc brake used in industrial machinery and the like when the brake is installed.

In view of the above-mentioned circumstances, the present invention has a simple structure in which the anchor pin that receives the torque of the pad of the opposed type disc brake is provided with two through holes for locking the special pin, making it easy to return the piston. The purpose is to provide a device that can obtain

That is, the configuration of the present invention is as follows. Abrasion of pads occurs on the anchor pin, which is attached to the caliper body on the side of the outer pad backing metal by penetrating the inner pad backing metal and the outer pad backing metal, and screwing one end of the pin into the caliper body on the outer pad backing metal side. Drilling a pin hole that is located near the inner side of the inner pad back metal with the disk as a reference, and a pin hole that is located near the inside of the outer pad back metal with the disk as a reference when the anchor pin is in a half-returned state, This is a piston return device for a disc brake in which a pin that can be hooked into both pin holes is hooked into a pin hole located near the inside of an inner pad back metal.

Therefore, when the pad wears out and you need to replace it, rotate the anchor pin in the removal direction until it is half-returned, and then use the thrust of the screw to engage the pin hole located near the inside of the inner pad back metal. Push back the inner pad back metal with the pin that has been moved, and then, in the half-returned state, insert the pin into the pin hole located near the inside of the outer pad back metal, and rotate the anchor pin in the screwing direction to remove the outer pad. By pushing back the back metal, the pistons that abut the respective pad back metal can be returned to their initial positions.

An embodiment of the piston return device according to the present invention will be described below with reference to the drawings.

1 in the figure is a caliper main body, which is inserted from the inner boss part 1a side between the inner boss part 1a and the outer boss part 1b on both sides thereof, and the outer boss part 1 is inserted from the inner boss part 1a side.
An anchor pin 3 screwed into b is installed perpendicularly to the disc 2 in the space. The anchor pin 3 passes through the edges of the inner pad back metal 4 and the outer pad back metal 5, receives the torque acting on both pads 6 and 7 during braking, and also serves as a strength member of the caliper body 1.

In the piston return device according to the present invention, pin holes 3b and 3b' are bored at two appropriate locations on the anchor pin 3 in a direction perpendicular to the axis of the anchor pin 3 at the following positions. That is, when both the pads 6 and 7 wear out, the pin hole 3b on the inner pad 6 side is located at a position adjacent to the inner pad back metal 4, which approaches with wear, but is not affected by it, that is, on the disk 2 side. The pin hole 3b' on the outer pad side is formed on the inner pad 6 side of the outer pad back metal 5 when the anchor pin 3 is screwed back by the push back amount of the outer pad back metal 5 and is in a half-returned state where it is screwed into the outer boss portion 1b. , are drilled at positions on the disk 2 side.
Then, the pin 8 inserted and fixed into the pin hole 3b, the pin hole 3b', and the pin hole 3b during normal operation.
and constitute a piston return device. The pin 8 has an insertion part 8a into the pin hole 3b, a contact part 8b which comes into contact with the inner pad back metal 4 or the outer pad back metal 5 when the piston (not shown) is pushed back, and a hook for fixing to the anchor pin 3. It consists of part 8c.

Next, the pushing back action of the piston will be explained. Figure 3 shows the relative positions of the pad backings 4, 5, pin holes 3b, 3b', and pin 8 when both pads 6, 7 are worn out, and Figure 4 shows the inner pad 6 pushed back by pin 8. The state and Figure 5 shows pin 8.
The state in which the outer pad 7 is pushed back after being inserted into the pin hole 3b' is shown.

If the pad is worn out, when replacing it, please use pin 8.
is located near the inner side of the inner pad back metal 4 on the disk 2 side, and when the anchor pin 3 is rotated in the removal direction, the abutment part 8b of the pin 8 is removed by the thrust of the screw.
If you touch the inner pad back metal 4 and push it back,
The inner side piston (not shown) that comes into contact with the inner pad back metal 4 is pushed back to the state shown in FIG. 4.
In this state, the disk 2 of the outer padded back metal 5
If the pin 8 is inserted into the pin hole 3b' on the outer pad side, which is located near the inner side, and from the pin hole 3b, and the anchor pin 3 is rotated in the screwing direction, the thrust of the screw will cause The pin 8 comes into contact with the outer pad back metal 5 and pushes back the outer piston (not shown), resulting in the state shown in FIG. 5.

The piston can be pushed back smoothly if the above operations are performed alternately and gradually using anchor pins attached to both sides of the caliper body.

As can be understood from the above explanation, according to the piston return device according to the present invention, the piston can be easily pushed back by using the screw thrust of the anchor pin installed in the disc brake when the brake is installed. No special jig is required.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway plan view of an opposed type disc brake equipped with a piston return device according to the present invention, Fig. 2 is a diagram showing the state in which the pin is hooked to the anchor pin, and Fig. This is an explanatory diagram showing the relationship between the pin hole and the pad back metal when the pad is worn out. Fig. 4 is an explanatory diagram showing the state in which the inner piston is pushed back, and Fig. 5 is an explanatory diagram showing the state in which the outer piston is pushed back. It is. 1... Caliper body, 2... Disc, 3...
Anchor pin, 3b, 3b'...Pin hole, 4...
Inner pad lining metal, 5... Outer pad lining metal, 8
...Pin, 8a...Insertion part, 8b...Abutment part, 8
c...Latching part.

Claims (1)

[Scope of utility model registration request] Abrasion of pads occurs on the anchor pin, which is attached to the caliper body on the side of the outer pad backing metal by penetrating the inner pad backing metal and the outer pad backing metal, and screwing one end of the pin into the caliper body on the outer pad backing metal side. Drilling a pin hole that is located near the inner side of the inner pad back metal with the disk as a reference, and a pin hole that is located near the inside of the outer pad back metal with the disk as a reference when the anchor pin is in a half-returned state, A piston return device for a disc brake, characterized in that a pin that can be hooked in both pin holes is hooked in a pin hole located near the inside of an inner pad back metal.