JPH0717863Y2 - Disc brake - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention is an improvement of a vehicle disc brake, and more specifically, an improvement of a return spring for separating a rotor and a stator of a sliding portion when a brake input is released. Disc brake related to.

[Conventional technology]

A conventional disc brake is, for example, as shown in FIGS. 2 (a) and 2 (b), a plurality of disc-shaped members that are spline-fitted to a rotary shaft (1), slidable in the axial direction, and fixed in the rotational direction. A rotor (2) and a sliding portion (4), which is arranged between the rotors (2) and is fixed to a housing (not shown), is provided around the fixed shaft (1). A fixed cam plate (5) and a sliding portion (4) which are penetrated by (1) and are attached to a vehicle body (not shown).
A ring-shaped rotating cam plate (6) is arranged between the two cam plates (5) and (6), and a plurality of pairs of recesses (9a) (9b) facing each other at predetermined intervals in the circumferential direction are provided on the opposing surfaces of the cam plates (5) (6). And the braking steel balls (7) are rotatably fitted therein, and a plurality of inner diameters of the rotating cam plate (6) and the fixed cam plate (5) are respectively arranged in the axial direction. It is stretched with the return spring (10). Furthermore, the recesses (9a) (9) in which the steel balls (7) are fitted
In the configuration of b), the concave portion (9b) of the rotating cam plate (6) has a substantially hemispherical shape, but the concave portion (9) on the fixed cam plate (5) side.
As shown in FIG. 2 (c), a) forms a tapered portion (11) that becomes shallow in the rotating direction of the rotating cam plate (6) when a brake input is applied.

When a brake input is applied to such a disc brake, the rotating cam plate (6) rotates in the direction of the arrow X shown in FIG. 2 (a), so that the steel ball (7) is tapered in the recess (9a). Get on (11) and roll. Therefore, the rotating cam plate (6) moves in the direction of the arrow Y shown in FIG. 2 (B) against the elastic force of the return spring (10) to come into contact with the sliding portion (4) and further move. Due to this, the sliding portion (4) is pinched by the outer outer plate (12) and the rotating cam plate (6), so that the frictional force between the rotor (2) and the stator (3) increases, and the rotating shaft Apply braking to (1).

When the brake input is released next time, the rotating cam plate (6) rotates in the anti-X direction by the restoring force of the return spring (10) and simultaneously moves in the anti-Y direction, and separates from the sliding portion (4). As a result, the braking of the rotary shaft (1) is released.

[Problems to be solved by the device]

In such a disc brake, as described above, the space formed by the inner diameter portions of both cam plates and the rotating shaft is occupied by the return spring, so that the layout is extremely inferior. Further, since the return springs are mounted in the axial direction, when the brake is applied, the return springs are pulled while being slightly inclined in the rotation direction by an angle corresponding to a slight rotation distance of the rotation cam plate. Then, when the brake input is released, the force that rotates the rotating cam plate in the opposite direction and returns it is only the sine component of the restoring force of the return spring, and the restoring force generated in the return spring is effective. There was also the problem of not being used. That is, the return springs actually used are stronger than necessary or have a larger number than necessary.

[Means for Solving the Problems] In view of this, the present invention has developed a disc brake that solves the above problems by using a spring that can effectively use the restoring force of the spring.

That is, the present invention is a disk-shaped rotor fixed to the rotating shaft in the rotating direction, and mounted so as to be slidable in the axial direction, and fixed in the housing in the housing adjacent to the rotor in the rotating direction of the rotating shaft. A friction part composed of a slidable ring-shaped stator is provided on the shaft, and a ring-shaped rotating cam plate is disposed between the fixed cam plate penetrating with the rotary shaft and the friction part. A ball that separates the two cam plates with the rotation of the rotation cam plate is interposed between them, and the rotation of the rotation cam plate in one direction due to brake input clamps the rotor and the stator to rotate the rotation shaft. In the disc brake in which both cam plates are brought close to each other by releasing the brake input by releasing the brake input to release the braking of the rotating shaft, the coil spring is The rotary shaft is penetrated into the inner diameter, and both ends of the coil spring are attached to the fixed cam plate and the rotary cam plate to bias the rotary cam plate in the other direction. is there.

[Action]

In this way, the single coil spring is arranged so that the rotation shaft penetrates through its hollow inner diameter, and both ends of the coil spring are attached to the fixed cam plate and the rotating cam plate, respectively, because the brake input is applied. The rotation of the rotating cam plate applies a torsional force to the coil spring, and the axial movement of the rotating cam plate (Y direction in FIG. 2) applies a tensile force to the coil spring, but the brake input is released. At this time, the restoring force generated in the coil spring by the torsional force acts as a moment in the returning direction of the rotating cam plate, and the sine component of the restoring force generated by the pulling force is applied in the returning direction. This is because the restoring force of the coil spring can be effectively used in its original size to restore

Also, since this coil spring is installed by winding the rotary shaft, the space formed by the inner diameter portions of both cam plates can be widely used, and the diameter of the rotary shaft can be increased or various functions can be achieved by utilizing this space. It has a very good layout property, such as the addition of a.

〔Example〕

 Next, an embodiment of the present invention will be described.

As shown in FIGS. 1 (a) and (b), a plurality of disc-shaped rotors (2) mounted on the rotary shaft (1) by spline fitting, fixed in the rotational direction, and slidably mounted in the axial direction. And a fixed cam in which a sliding portion (4) including a ring-shaped stator (3) arranged between the rotor (2) and the rotor (2) is provided around the rotary shaft (1), and the rotary shaft (1) penetrates the inner diameter portion. A ring-shaped rotating cam plate (6) is disposed between the plate (5) and the sliding portion (4), and the rotating cam plate is provided between the facing surfaces of both cam plates (5) and (6). A ball (7) for separating the cam plates (5) and (6) with the rotation of (6) and moving the rotation cam plate (6) to the sliding portion (4) side.
And a coil spring (8) that winds the rotating shaft (1) around the inner diameters of both cam plates (5) and (6), and one end of the spring (8) of the rotating cam plate (6). Attach to the inner edge and fix the other end to the cam plate (5)
A disc brake having a structure attached to the inner edge portion of was manufactured.

According to such a disc brake, the annular space (13) formed by the rotating shaft (1) and the inner diameter portions of the cam plates (5) and (6) is considerably wide.

[Effect of device]

According to the present invention, the restoring force of the coil spring in the torsion direction and the restoring force of the tension direction can be effectively utilized at the same time, so that the number of parts of the disc brake can be reduced, and further, the rotating shaft and the inner diameter portions of both cam plates are This is an industrially significant effect such that the space can be widened and the layout property is good.

[Brief description of drawings]

1 (a) and (b) show an embodiment of the present invention, (a) is a front view, (b) is a sectional view taken along the line AA 'of (a),
2 (a), (b), and (c) show a conventional example.
Is a front view, (b) is a sectional view taken along the line BB 'of (a), (c).
FIG. 9A is a sectional view taken along line CC ′ of FIG. 1 …… Rotary shaft 2 …… Rotor 3 …… Stator 4 …… Sliding part 5 …… Fixed cam plate 6 …… Rotating cam plate 7 …… Ball 8 …… Coil spring 9a, 9b …… Concave 10 …… Return spring 11 …… Tapered portion 12 …… Outer plate 13 …… Annular space

Claims (1)

[Scope of utility model registration request] 1. A disc-shaped rotor fixed to a rotary shaft in the rotational direction thereof and slidably mounted in the axial direction, and fixed to a housing in the housing adjacent to the rotor in the rotational direction of the rotary shaft. A friction part composed of a ring-shaped stator slidable in the direction is provided, and a ring-shaped rotating cam plate is arranged between the fixed cam plate and the friction part which are penetrated by the rotary shaft, and both cam plates face each other. A ball is interposed between the surfaces to separate the two cam plates according to the rotation of the rotating cam plate, and the rotating cam plate is rotated in one direction by a brake input to rotate by pinching the rotor and the stator. In a disc brake in which both cam plates are brought close to each other by braking the shaft and releasing the brake input to release the braking of the rotating shaft, the coil spring is A disc brake in which a rotary shaft is penetrated by an inner diameter and both ends of a coil spring are attached to a fixed cam plate and a rotary cam plate so as to bias the rotary cam plate in the other direction. .