JPH0130667Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial field of application The invention is based on a pair of brake levers that are rotatable with respect to each other, each having a pad attached thereto, and the brake levers being opened and closed via a link mechanism. The present invention relates to a disc brake in which braking is performed by bringing the pad into pressure contact with a brake rotor.

Prior Art This type of disc brake is also called a link type disc brake because it performs braking via a link mechanism, and there is a disc brake disclosed in Japanese Patent Application No. 57-202394. That is, as shown in FIG. 1, this link type disc brake 1 has a pair of brake levers 3 and 4 rotatably pivoted to a bracket 2 mounted on a vehicle body B as a fixed body. It is worn. the pair of brake levers 3;
Brake pads 7 and 8 disposed on both sides of the brake rotor 6 are fixed to one end of the lever 4, and a link mechanism 9 is provided between the other end of the pair of brake levers 3 and 4. Link mechanism 9
are expanded via a wheel cylinder 10 as an actuating means integrally formed with the bracket 2, so that the brake levers 3 and 4 rotate in opposite directions about the lever pin 5, and the brake pads are rotated in opposite directions. 7 and 8 are pressed against the brake rotor 6 to perform braking.

Incidentally, in the case of the disc brake 1, in order to adjust the gap 8 between the brake pads 7, 8 and the brake rotor 6 depending on the wear of the brake pads 7, 8, a ,
Second adjusting bolts 11 and 12 are provided.
The first adjusting bolt 11 adjusts the opening degree between the pair of brake levers 3 and 4, and the second adjusting bolt 12 adjusts the opening degree between one brake lever 4 and the bracket 2. Possibly a pair of brake pads 7, 8 and a brake rotor 6
Both gaps 8 are made equal between them.

However, in such a conventional disc brake 1, as the brake pads 7 and 8 wear out, the first and second adjusting bolts 1
There was a problem that it was necessary to adjust 1 and 12, which made the adjustment work complicated.

Purpose of the invention In view of these conventional problems, the present invention simplifies the adjustment work by automatically adjusting the opening between a pair of brake levers according to the amount of wear on the brake pads. The purpose is to provide a disc brake that can achieve the following.

Structure of the Invention In order to achieve the above object, the present invention includes a bracket attached to a fixed body, and a bracket disposed in the thickness direction of the brake rotor with the bracket sandwiched therebetween, and a lever pin rotatably attached to the bracket. a pair of brake levers attached to the brake lever; a pair of brake pads attached to the brake levers and facing both sides of the brake rotor; A disc brake comprising a link mechanism that opens and closes, and an actuating means that is provided on the fixed body side and that comes into contact with the link mechanism to open and close the link mechanism, the abutting portion between the link mechanism and the actuating means; and,
The lever pins are arranged at a distance from each other, and at least one of the link mechanism and the actuating means at the corresponding contact portion is formed with a flat part in a tangential direction of a virtual arc centered on the lever pin, and the flat part is formed. The other of the link mechanisms or actuating means is brought into contact with the plane part on a perpendicular line passing through the lever pin, and is provided on one of the lever pins or the connecting pins between the lever pin and the connecting pin of the link mechanism. A saw-shaped member and a claw provided on the other side and capable of engaging with a plurality of hooks of the saw-shaped member in the return direction of the brake lever are provided with an automatic adjustment device. .

Embodiment Hereinafter, an embodiment of the present invention will be described in detail based on the drawings.

3 and 4 show a link type disc brake 100 showing an embodiment of the present invention, and this disc brake 100 has a pair of brake levers 110, 111 arranged substantially parallel to a vehicle body B as a fixed body.
Bracket 1 is attached via bolt 121 to
20 in the thickness direction of the brake rotor 130. These brake levers 110,
Reference numeral 111 denotes connection protrusions 110a and 111a extending inward from both sides in the circumferential direction of the brake rotor 130 (in the direction in which the brake levers 110 and 111 face each other).
On the other hand, a pair of support protrusions 120a are provided vertically from the bracket 120, and the support protrusions 12
The connecting protrusions 110a and 111a are alternately overlapped and rotatably connected by a lever pin 112 between 0a. The brake rotor 130 is attached to a wheel (not shown). An inner pad 140 (right side in the figure) and an outer pad 141 are installed inside the lower end of the brake levers 110, 111 so as to face both sides of the brake rotor 130, and at the upper end of the brake levers 110, 111. There is a link mechanism 15 between
0 is set. This link mechanism 150 has two
The inner ends of the first lever 151 and the second lever 152 are rotatably connected via a connecting pin 153, and the connecting portion C is bent downward at a predetermined angle. The outer ends of the second levers 151, 152 are pivotally connected to the upper ends of the brake levers 110, 111 via attachment pins 154, 155.
By the way, the bracket 120 has a cylinder wall 16 of a wheel cylinder 160 as an operating means.
1 is integrally molded, and a piston rod 162 protruding from a piston (not shown) fitted into the cylinder wall 161 is brought into contact with the connecting pin 153 from below. That is, the piston rod 162
A plane part A in the tangential direction of a virtual arc centered on the lever pin 112 is formed at the upper end of the lever pin 112 , and the connecting pin 153 is brought into contact with the plane part A on a perpendicular line passing through the lever pin 112 . Therefore, when braking during normal driving, the wheel cylinder 160 is hydraulically operated by stepping on the brake pedal, and the piston rod 162 is activated by the link mechanism 150.
At this time, the upper ends of the brake levers 110, 111 are opened by the force that causes the first and second levers 151, 152 to expand, and the lever ratio centered on the lever pin 112 is By increasing the spreading force and closing both the inner and outer pads 140, 141, the two pads 140, 141 are brought into pressure contact with the brake rotor 130, thereby performing braking. Further, the pivoting portion of the first lever 151 to the brake lever 110 is extended inward and upward to form a substantially L-shape to form an actuation lever 156;
Parking cable 1 is connected to the end of this operating lever 156.
By connecting 57, the parking brake functions as another actuating means. That is, when applying the parking brake, the parking cable 157 is pulled by operating a parking lever (not shown).
The operating lever 156 rotates clockwise about the right mounting pin 154. Then, the operating lever 1
56 and a second lever 152 connected thereto via a connecting pin 153.
As the inner and outer pads 140 and 141 expand toward each other, the inner and outer pads 140 and 141 engage with the brake rotor 13 in the same way as during braking by the wheel cylinder 160.
Braking is performed by being pressed to zero. Furthermore, the mounting pins 154 and 155 provided at the upper ends of the brake levers 110 and 111
A compression coil spring 170 as a return spring is installed in between, and when the above-mentioned braking is released, the brake levers 110, 111 are returned to their original states, and the pads 140, 141 are separated from the brake rotor 130. There is.

Further, the disc brake 100, as shown in FIG. A first screw hole 180 penetrating the right side) is formed, and this first screw hole 1
A first adjusting bolt 181 is screwed inward to the first adjusting bolt 180 .
The tip of the brake lever can be brought into contact with the inside of the brake lever 110 on the right side in the figure. Further, the first screw hole 180 is located in the center of the left brake lever 111.
The second adjusting bolt 183 is passed through the second screw hole 182 in parallel with the second screw hole 182, and is screwed inward into the second screw hole 182.
The tip of the bracket 120 can come into contact with a cylinder wall 161 formed integrally with the bracket 120. 18
4,185 are the first and second adjusting bolts 1;
81,183 fixing nut.

Here, in the present invention, the lever pin 11
2 and the connecting pin 153 of the link mechanism 150, an automatic gap adjustment device 200 is provided. As shown in FIG. 6, this automatic gap adjustment device 200 consists of a base member 210 that has two crotches 213 formed at its lower end by joining a pair of plates 211 and 212.
Similarly, an intermediate member 220 having a pair of plates 221 and 222 joined together is movably inserted into the bifurcated portion 213 of the base portion 210, and the intermediate member 220 has the bifurcated portion 223 formed at its lower end. Serrated member 230 movably inserted into bifurcated portion 223 of member 220
It is composed of: A mounting hole 214 is formed at the upper end of the base member 210, and the connecting pin 153 is fitted into the mounting hole 214.
Further, a pin hole 21 is provided through each of the bifurcated portion 213 of the base member 210 and the upper end portion of the intermediate member 220.
5 and a long hole 224 are formed, and these pin holes 2
15. By inserting the pin 240 into the long hole 224, the base member 210 and the intermediate member 220 are connected. The base member 210 and the intermediate member 220 are moved relative to each other by a gap S between the elongated hole 224 and the pin 240, and this relative movement amount causes the brake pad 14
0,141 and the minimum gap δ between the brake rotor 130 is determined. The serrated member 230 is formed into a serrated shape having a plurality of hooks 231 at a portion inserted into the bifurcated portion 223 of the intermediate member 220, and the hook is inserted from the lower end of one plate 221 of the intermediate member 220. A claw 225 that can be engaged with the portion 231 is formed. The pitch P between the hook portions 231 is determined in consideration of the maximum allowable amount W (<P+S) of the gap δ between the brake pads 140, 141 in relation to the gap S between the elongated hole 224 and the pin 240. A mounting hole 232 formed at the lower end of the saw-shaped member 230 is connected to the lever pin 1.
12. Note that both sides of one plate 212 of the base member 210 and one plate 222 of the intermediate member 220 are as shown in FIGS.
The bent portions 216, 2 are bent as shown in the figure.
26 prevents relative rotation between the base member 210 and intermediate member 220 and separation of the saw-shaped member 230 due to lateral movement.

With the above configuration, in the disc brake 100 of this embodiment, the disc brake 100
Before using the brake pads 140, 141 or when replacing the brake pads 140, 141 with new ones, the gap δ between the brake pads 140, 141 and the brake rotor 130 can be adjusted in advance by adjusting the first and second adjustment bolts 181, 183. I'll keep it. After that, if the brake is applied, wheel cylinder 1
60 or the parking cable 157, the first and second levers 151, 152 of the link mechanism 150 are opened. At this time, as the first and second levers 151 and 152 are expanded, the connecting pin 153 moves in a direction away from the bracket 120, that is, the lever pin 112, and the automatic gap adjustment device 200 is activated. That is, as the connecting pin 153 moves, the base member 210 moves upward, and the pin 240 moves toward the intermediate member 220 as shown in the figure.
comes into contact with the upper end surface of the elongated hole 224. The amount of movement of the base member 210 at this time is the gap δ between the pin 240 and the elongated hole 224, but if the gap δ between the brake pads 140 and 141 is larger, the intermediate member 220 also moves upward. Furthermore, brake pads 140, 141
If the amount of wear on the intermediate member 2 is increasing,
20, the claw 225 passes over one hook 231 of the saw-like member 230. Then, when the brake is released, the pawl 225 is engaged with the hook portion 231 that has climbed over, thereby preventing the intermediate member 220 from moving downward. Therefore, the base member 210, that is,
The amount of downward movement of the connecting pin 153 corresponds to the gap δ between the pin 240 and the elongated hole 224, and the gap δ between the brake pads 140, 141 and the brake rotor 130 corresponds to the opening degree of the brake levers 140, 141 commensurate with this gap δ. will be established. After that, brake pads 140 and 141 will be installed in the same way.
As the amount of wear increases, the pawl 225 gradually becomes more
1 and is locked, and the intermediate member 220
is automatically raised by one pitch P to prevent the gap δ between the brake pads 140 and 141 from becoming larger than a predetermined amount (the opening degree of the brake levers 110 and 111 commensurate with the amount of movement of P+S). In this way, in this embodiment, the automatic gap adjustment device 200
By providing the brake pad 140,
Brake pad 1 automatically changes depending on the wear of 141.
Since the gap δ between 40 and 141 is adjusted, there is no need for subsequent gap δ adjustment work, and smooth braking is always possible, improving safety.
In this embodiment, since the automatic gap adjustment device 200 is attached to the existing connecting pin 153 and lever pin 112, an increase in the number of parts can be prevented.

Effects of the invention As explained above, in the disc brake of the invention, the bracket attached to the fixed body has
A pair of brake levers that are opened and closed via a link mechanism are attached so as to be freely openable via a lever pin, and an automatic adjustment device is provided between the lever pin and a connecting pin of the link mechanism. Gap: The gap between the brake pad and the brake rotor can be automatically adjusted by the automatic adjustment device. Therefore, the work to adjust the gap is omitted, and the gap can always be set within the optimum range, allowing smooth braking.
Safety can be significantly improved. Furthermore, by providing the automatic adjustment device between the lever pin and the connecting pin, the automatic adjustment device can be placed on the inner surface of the movable range of the brake lever, and the automatic adjustment device can be placed between the lever pin and the connecting pin. This prevents the brake lever from protruding outward, allowing for compact storage. Furthermore, the automatic gap adjustment device is capable of engaging a saw-like member provided on one of the lever pin or the connecting pin and a plurality of hooks of the saw-like member provided on the other hand in a direction in which the brake lever is returned. Since the automatic adjustment device is provided with a pawl, the durability of the automatic adjustment device can be significantly improved and adjustment can be performed reliably. Furthermore, at the abutting portion between the link mechanism and the actuating means, at least one of the link mechanism and the actuating means is provided with a flat portion in a tangential direction of a virtual arc centered on the lever pin, and the flat portion is formed. Since the other of the link mechanisms or the actuating means is brought into contact with the flat part on a perpendicular line passing through the lever pin, the pair of brake levers are always kept in the neutral position when these link mechanisms and the actuating means are in contact with each other. It has the excellent effect of being able to hold

[Brief explanation of the drawing]

Fig. 1 is a front view of a conventional disc brake, Fig. 2 is a sectional view taken from the line - - in Fig. 1, Fig. 3 is a front view of a disc brake showing an embodiment of the present invention, and Fig. 4 is a 3 is a side view of the disc brake shown in FIG. 3, FIG. 5 is a sectional view of main parts taken from the line - - in FIG. 3, FIG. 6 is a sectional view of the automatic gap adjustment device used in the disc brake shown in FIG. The figure is a sectional view taken from the line in Fig. 6, and the figure 8 is a sectional view taken from the line in Fig. 6.
FIG. 100...Disc brake, 110,111
... Brake lever, 112 ... Lever pin, 1
20... Bracket, 130... Brake rotor, 140, 141... Brake pad, 150
... Link mechanism, 153 ... Connection pin, 160 ...
...Wheel cylinder (operating means), 200...Automatic gap adjustment device, 225...Claw, 230...Saw-like member, 231...Hook portion, A...Plane portion, B...Vehicle body (fixed body).

Claims (1)

[Claims for Utility Model Registration] A bracket attached to a fixed body, and a pair of brakes arranged in the thickness direction of the brake rotor with the bracket sandwiched between them, and rotatably pivoted to the bracket via a lever pin. A lever, a pair of brake pads each attached to the brake lever and facing both sides of the brake rotor, and a link mechanism provided between the brake levers to open and close the pair of brake levers around a connecting pin. , an actuating means provided on the fixed body side and abutting on the link mechanism to open and close the link mechanism; an abutting portion between the link mechanism and the actuating means;
The lever pins are arranged at a distance from each other, and at least one of the link mechanism and the actuating means at the corresponding contact portion is formed with a flat part in a tangential direction of a virtual arc centered on the lever pin, and the flat part is formed. The other of the link mechanisms or actuating means is brought into contact with the plane part on a perpendicular line passing through the lever pin, and is provided on one of the lever pins or the connecting pins between the lever pin and the connecting pin of the link mechanism. The present invention is characterized in that an automatic adjustment device is provided between the saw-like member and a claw provided on the other side and capable of engaging a plurality of hooks of the saw-like member in the return direction of the brake lever. disc brake.