JPS6237257B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a mechanical disc brake in which, when a friction pad rubs, the position of the friction pad can be easily changed by the amount of wear. .

A mechanical disc brake converts a rotational input given by a cable connected to a brake pedal or a brake lever into a linear output, and uses this linear output to perform a braking action. The rotational force is converted into a linear force by a nut integrally connected to the lever, and a rod that engages with the nut and is prevented from rotating relative to the nut by a stopper, Rotation of the nut displaces the rod in the axial direction and presses one of the friction pads against the disk.

That is, when braking force is transmitted to the nut via the cable, the nut rotates and displaces the rod in the axial direction. During this time, rotation of the rod is prevented by a stopper. When the pad comes into contact with the disk, a reaction force acts on the meshing surface of the rod and nut through the rod, so the frictional force between them increases and the rod and nut begin to rotate together, albeit very slightly. However, the relative positions of Rod and Natsu do not change. When the brake is released, the nut rotates in the opposite direction, and the rod rotates in the opposite direction by the same amount as the rod rotates together with the nut, but from then on, the rod is prevented from rotating and is displaced by the nut to its original position. In other words, even if the rod rotates, albeit very slightly, as described above, this rotation is integral with the nut, so its relative position with the nut does not change.

Conventionally, the stopper was fixed to the lever connected to the cable with a nut or a screw, which resulted in the problem that the number of parts increased and assembly and maintenance were time-consuming.

In order to solve the above-mentioned problems, the present invention is provided with a caliper that is non-rotatably held on the surface of the annular wall of the caliper on the outer concave side, and that the foot part has an elastic force on the circumferential surface of the rod having a polygonal cross-sectional shape. a stopper that engages with the rod to prevent the rod from rotating against the frictional force between the nut and the rod that occurs during braking, a spring receiver provided at the other end of the rod, and one end fixed to the spring receiver. The other end is equipped with a spring interposed to press the stopper against the annular wall of the caliper and to bias the rod outward, and when braking force is transmitted to the nut, the nut rotates. The rod is axially displaced into contact with the first friction pad. When the braking force is released, the nut is reversely rotated by the urging force of the spring, displacing the rod to its original position. During this time, relative rotation between the nut and rod is prevented by a stopper that is non-rotatably pressed against the caliper by a spring.

Embodiments of the present invention will be described below with reference to the drawings.

1 and 2, reference numeral 1 denotes a support member fixed to the vehicle body, and the support member 1 has a caliper 3 formed with legs 3a and 3b so as to sandwich the disc 2. It is supported slidably on the plate surface. One leg 3 of the caliper 3
a extends to a back metal 4a of a first friction pad 4 arranged on one side of the disc 2, and a recess 6 is formed in the other leg 3b of the caliper 3 at a position facing the friction pad 5. At the same time, a recess 8 is formed so as to sandwich the annular wall 7 and open outward.

Further, a hole 7a is formed in the end face of the wall 7 so as to open toward the recess 8 side.

As shown in FIGS. 2 and 3 a and b, a lamp plate 9 is arranged and fixed in the recess 6 on the wall 7 side, and a nut 10 to which a lever 20 is fixed is attached to the lamp 9. They are arranged facing each other, and grooves 11 and 12 that extend in the circumferential direction and are inclined so that the depth gradually changes are provided on the opposing surfaces of the two. When the grooves 13 are fitted together and the two are relatively displaced, the ball 13 rotates along the slope of the grooves 11 and 12 to separate the two. A rod 14 is screwed into the nut 10, and one end 14a of the rod 14 is connected to the friction pad 5.
The other end 14b passes through the lamp plate 9 and the wall 7 and faces into the recess 8, and a spring receiver 15 is provided at the end.

The other end 14b of the rod 14 has a hexagonal cross section, and the foot portion 16a of the stopper 16 is in elastic contact with two mutually opposing flat surfaces 14c having a hexagonal cross section. The base 16b of the stopper 16 is in surface contact with the end face of the wall 7 on the recess 8 side, and the base 16b
A hole 16c is formed in the hole 6b. The spring receiver 15 has one end 17a of the return spring 17.
is fixed, and the other end 17b is a stopper 1
The stopper 16 is inserted into the hole 7a of the wall 7 to regulate the position of the stopper 16. The return spring 17 is attached to the rod 14 with the nut 10.
The ball 13 is prevented from falling off by applying a rotational force in the opposite direction to the direction in which the ball 13 is rotated, and by urging the lamp plate 9 and the nut 10 closer to each other via the rod 14. 18 is a dust cover, and 19 is a cover that closes the recess 8.

Hereinafter, the operation of the mechanical disc brake according to the present invention will be explained.

When the lever 20 is rotated by the cable in the direction of arrow A in FIG. 1, the nut 10 is rotated and displaced from the lamp plate 9 toward the friction pad 5.
The friction pad 5 is pressed against the disk 2 by the rod 14, and the caliper 3 is moved by the reaction force, and the leg portion 3a presses the friction pad 4 against the disk 2, thereby generating a braking force.

When the force is removed from the lever 20, the nut 10 is rotated in the opposite direction by the return spring 17, the nut 10 and the ramp plate 9 are pinched, and the friction pads 4, 5 are separated from the disk 2. When the nut 10 is rotated as much as necessary, the spring force of the return spring 17 disappears, and the nut 10 stops rotating in the opposite direction.

The return spring 17 is inserted into the hole 1 of the stopper 16.
6c and fits into the hole 7a of the wall 7, there is no need to fix the stopper to the back metal of the friction pad 5 with a screw or bolt as in the conventional case, and rotation of the stopper 16 is prevented. At the same time, this part can be protected.

When the friction pads 4 and 5 wear out, the cover 19 is removed and the rod 14 is forcibly rotated against the spring force of the stopper 16 to move the friction pads 4 and 5 toward the disk 2, thereby removing the friction pads. The clearance between the disc 2 and the disc 2 can be maintained constant.

4a and 4b show another embodiment of the present invention, in which a groove 21 is provided in the inner circumferential wall of the recess 8 of the caliper 3,
The stopper 16 is provided with a posture 16d projecting in the radial direction, and the protrusion 16d is fitted into the groove 21 to prevent the stopper 16 from rotating.

5a and 5b show still another embodiment of the present invention, in which a notch 23 is provided in the caliper 3, a part of the stopper 16 is bent in the axial direction of the rod 14, and this bent portion 16e is attached to a wall. The stopper 16 is fitted into the hole 7b of No. 7 to prevent the stopper 16 from rotating.

As explained above, in the present invention, since the stopper is located inside the outer recess, the stopper can be fixed with a spring, and therefore a fastening member such as a screw for fixing the stopper is not required. This reduces the number of parts and allows for cheaper supply.

Furthermore, since the spring is pressed against the caliper via the stopper, the wall will not be damaged even if the spring rotates slightly.

[Brief explanation of the drawing]

FIG. 1 is a front view of a disc brake according to the present invention. FIG. 2 is a sectional view taken along the line -- in FIG. FIGS. 3a, 4a, and 5a are sectional views showing a structure for stopping the rotation of the stopper in the present invention. FIG. 3b is a sectional view taken along the line -- in FIG. 3a. FIG. 4b is a sectional view taken along the line -- in FIG. 4a. FIG. 5b is a sectional view taken along the line -- in FIG. 5a. 2...Disc, 9...Lamp plate, 16...Stopper, 17...Return spring, 20...Lever.

Claims (1)

[Claims] 1. A caliper that is slidably supported by a support member in the axial direction of the disk and has legs that extend across the disk on both sides, and one leg of this caliper that extends to one side of the disk. a second friction pad that is slidably provided in the axial direction opposite to the first friction pad that is pressed against the other side of the disk; an inner cavity and an outer recess formed in the direction of movement of the inner cavity, a nut provided in the inner recess and rotated by a lever, and for converting the rotation of the nut into a thrust force for pressing the second friction pad. a thrust converting mechanism, and a rod having a polygonal cross-sectional shape that is screwed onto the nut, one end of which abuts the second friction pad, and the other end of which extends through the annular wall and into the outer recess. , the base portion is held non-rotatably on the surface of the outer recess of the annular wall, and the foot portion elastically engages with the circumferential surface of the rod having a polygonal cross-sectional shape, thereby preventing the nut from occurring during braking. a stopper that prevents the rod from rotating against the frictional force between the rod and the rod; a spring receiver provided at the other end of the rod; 1. A mechanical disc brake comprising a spring interposed so as to press the rod and urge the rod outward. 2. In claim 1, the stopper is provided with a hole, one wall is provided with a hole, and the end of the return spring is inserted through the hole in the stopper to prevent rotation of the stopper. A mechanical disc brake that is characterized by the following: 3. In claim 1, the stopper is provided with a protrusion projecting in the radial direction, a groove is provided in the inner circumferential wall of the recess of the caliper body, and the protrusion of the stopper is fitted into the groove of the caliper body. A mechanical disc brake characterized by a stopper that stops rotation. 4. The machine according to claim 1, wherein a portion of the stopper is bent in the axial direction and the bent portion is fitted into a hole in the caliper main body to stop the stopper from rotating. Type disc brake.