JPS58128542A - Automatic adjusting mechanism for disk brake - Google Patents

Abstract

PURPOSE:To simplify the structure of an adjust mechanism for a floating caliper type disk brake and to facilitate manufacture and assembling of the same, by arranging two magnets on the side of a holder and on the side of a hollow piston in the manner that they exhibit the same polarity toward each other. CONSTITUTION:In case that wear of two pads 3, 5 is greater than a tolerable range, a snap ring 14 comes into abutment with a sleeve nut 11 when the service brake is actuated, and a gap is formed between a cone portion 13a of a holder 13 and a conical hole 2b formed at the front portion of a hollow piston 2. Here, since a magnet 16 is acted by the repulsive force of a magnet 17, the holder 13 is pushed in a direction removing the gap delta between the sleeve nut 11 and the snap ring 14, i.e., in the direction of movement of the piston 2, and the sleeve nut 11 and the holder 13 are turned forward on an adjusting screw 7. Thus, it is enabled to adjust a disk brake.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an auto-adjuster mechanism for parking disc brakes. Disc brakes have better heat dissipation performance than drum brakes, but
When the king mechanism is incorporated, the structure becomes multi-shaft, and in the conventional automatic adjuster AM using a clutch spring, the tension of the clutch spring and the tightening amount of the sleeve nut to the adjusting screw must be selected at appropriate values, and the clutch There was a risk that the auto adjuster would not operate properly if a foreign object got caught between the spring and the sleeve nut.The 8A is easy to manufacture and assemble by using a permanent magnet in addition to the clutch spring. The present invention will be specifically explained below with reference to drawings showing embodiments of the present invention.In the drawings, numeral 1 indicates a caliper of a 70-taing caliper type disc brake. The cylinder tbt of the rear arm 1a of the carino arm 1 has the hollow piston 2 fitted therein. Hoai @2m
, 2m to restrain the rotation of the piston 2.

The outer pad 5 is in contact with the forearm 1c of the caliper 1 at its back metal 6, and the base end of the adjusting screw 7 is inserted into the rear arm 1a of the caliper 1 while keeping it oil-tight with a seal 8. A toggle type parking mechanism consisting of a link 9 and a cam portion 10 integrated with a parking lever (not shown) is connected. The tip of the adjusting screw 7 forms a base rod portion 7a with a multi-thread thread. 011 is a sleeve nut that is screwed into the base rod portion 7a, and a pin 12 is planted at the front end. 013#: T Sleeve Nut 11) This is a crowned holder, and its external shape includes a cone portion 131 at the tip, a large diameter portion 13b connected to this, a through hole 13e that loosely fits the outer ring, and a round 114I round side surface. 13f and a large diameter hole 13g that houses the sleeve nut 11. A sleeve nut 11 is loosely inserted into the large diameter hole 13g, and a retaining hole 13h with a pin 12 bored into the holder 13.
G loosely inserted sleeve nut llt; j o1 that is allowed to move relative to the holder 13 only in its axial direction;
This is a snap ring attached to the large diameter hole 13gP3Ij11t of the 4Fi holder, and movement of the sleeve nut 11 in the axial direction with respect to the holder 13 is regulated by the snap ring 14 and the internally hooked side surface 13f.

The hollow piston 2 is mounted on the holder 13, and the cone portion 13m of the holder is in surface contact with the circle @i2b at the front of the hollow piston 2. A snap ring 15 is attached to the outer 1118-shaped bearing surface 13e of the holder 13 and the inner peripheral surface of the hollow piston 2.
Two annular permanent magnets 16 and 17, one on the holder 13 side and the other on the snap ring 15 side, are arranged between them with the same polarity facing each other. Therefore, when the holder 13
Ifi and Ii of both magnets 16 and 17 are urged to come into contact with the conical hole 2b of the piston. Therefore, there is a gap δ between the sleeve nut 11 and the snap ring 14. In a conventional disc brake with a notched ring, a bear link and a clutch spring are interposed between the outer in-shaped side surface 13 of the holder 13 and the snap ring 15. According to the present invention, the structure is simple and manufacturing and assembly are easy. In other words, the holder 13 and the snap ring 15
If the magnets are made of a magnetic material such as iron, the two magnets t@ and ty will be attracted and locked to the holder 13 and the snap ring 15, respectively, so there is no need to provide any special fixing means.

In addition, 18 is a disk, 19 is a sleeve nut 1
1 and a return spring for returning the toggle-type no-king mechanism to the brake release position; 20 is a dust seal for the auxiliary layer; 21 is a rubber clasp that prevents rain water from entering; and 22 holds the link 9. It's a spring.

Next, we will explain the operation. When pressurized oil is introduced from the outside into the cylinder tbt of the carry/9 during zero service rake, the hollow piston 2 strokes with the holder 13, and when the inner pad 3 slides on the disk 18, The carrier arm 1 floats in response to the reaction force, and the outer pad 5 also slides into contact with the disk 18, and the disk 1s is compressed by both pads 1s and 1s to generate a braking force. At that time, if the wear amount of both/quarter pads 3°5 is within the allowable range, the amount of movement of the holder 13 with respect to the sleeve neck (11) is within the relative predetermined movement amount of the holder 13, psJ. , 5 exceeds the allowable range, the snap ring 14 comes into contact with the sleeve nut 11 during service braking, causing damage between the cone portion 13m of the holder 13 and the conical hole 2b at the front of the mid-sized piston 2. A gap is created between the two. Then, since the magnet 16aa receives the repulsive force of the stone 17, the holder 13 is pressed in the direction of digging the gap, that is, in the direction of actuation of the piston 2, and the sleeve nut 11 and holder 13 are moved against the adjusting screw 7. Adjustment is performed by screwing out.◇ As explained above, according to the present invention, in the 7E1-ring carry/arm-shaped disc brake.

Since the magnets are arranged on the holder side and the piston side with the same polarity facing each other, there is no need for bearings, etc., which were conventionally used to reduce the rotational resistance of the holder, and the structure of the adjustment mechanism is simplified, which is particularly effective. Configuration sa mataru 2
Strict dimensions and precision are not required for the individual magnets, making manufacturing and assembly easier, and also improving the reliability of the adjustment mechanism.Furthermore, since the repulsive force between the magnets is inversely proportional to the square of the magnet gap, Since the adjusting force is attenuated as the magnet moves away, it is suitable for an adjusting mechanism that can have the disadvantage of unreasonable force acting on each component of the adjusting mechanism.

[Brief explanation of drawings]

The drawing is a longitudinal cross-sectional view of a disc brake with parking according to the present invention. l... Caliper 11... Caliper rear arm lc... Caliper/first forearm 2... Piston 2b... 2-stone conical hole 5... Actor pad 7... Adjusting screen 7a ... Screw part 9 ... Link 10 ... Force part 11 ... Sleeve nut 12 ... Bottle 1s ... Holder 13 m conflict ... Bent part 13e of holder = Outer am-shaped 11 faces 14 river snap spring of holder 15...Snap ring 16, 17...Permanent magnet 18...Disk agent Toshiyuki Maeda

Claims (1)

[Claims] An adjusting screw that has a base rod S at its tip and whose base end passes through the rear arm of the caliper and connects it to the toggle parking aims, a sleeve nut that is screwed into the base rod with a multi-thread screw, and a sleeve. Nara)i 411Ii11
A holder with a cone S at the tip of the ItcF trough and a cone S on the tip of the holder and a circular hole that fits the cone of the holder and fits into the rear arm of the caliper. In a 70-teigning caliper type disc brake with a piston and an inner pad in contact with the tip thereof, the f% value is the fact that the power is distributed on the holder side and inside with the same polarity of the piston and the frosted magnet facing each other. Brake auto adjuster.