JPH0219631Y2 - - Google Patents

Description

[Detailed Description of the Invention] Technical Field The present invention relates to an improvement of a disc brake with a parking brake.

Prior Art The parking brake lever is provided with an operating force transmitted through an operating force transmission device including a flexible outer casing and an inner cable longitudinally disposed within the outer casing so as to be movable in the axial direction. A disc brake with a parking brake is known in which the parking brake lever is rotated to operate the brake.

In such disc brakes with parking brakes, the outer casing of the operating force transmission device is usually fixed to the vehicle body with one end fixed to the caliper of the disc brake and the other end curved, and one end of the outer casing An inner cable protruding from the section is connected to the tip of a parking brake lever rotatably attached to the caliper. When the inner cable that runs vertically inside the outer casing is pulled in when the parking brake is operated, the parking brake lever is rotated and the pads are pressed, thereby providing parking brake force. There is.

Problems to be solved by this invention However, in order to obtain sufficient parking brake force in such a disc brake with a parking brake, it is necessary to reduce the distance between the center of rotation of the parking brake lever and the part where the operating force is applied by the inner cable. However, since the brake operation stroke increases accordingly, it is not always easy to obtain a sufficient parking brake force while maintaining the brake operation stroke.

On the other hand, as shown in FIG. 4 of JP-A No. 54-12074, for example, one end of one of a pair of levers that are pivotally connected by a common pin to form a scissors shape. If the end of the inner cable is connected to the end of the inner cable, and the end of the outer casing is connected to the end of the other lever that is opposite to the end of the lever, by pulling in the inner cable, one lever can be moved. is rotated in the acting direction, and the other lever is also rotated in the acting direction due to the reaction force generated in the outer casing, so the distance between one end of the one lever to which the inner cable is connected and the pin is In this case, the reaction force of the outer casing against one end of the other lever is applied in the other direction. Since it is difficult to avoid a relatively large inclination with respect to the longitudinal direction of the lever, the loss of the reaction force of the outer casing becomes large and it is difficult to obtain a sufficient rotational force in the operating direction of the other lever.

In addition, the parking brake lever has a rotation shaft that is integrally provided with the parking brake lever, which is rotated by an operating force transmitting device having an outer casing and an inner cable that runs longitudinally through the inside of the outer casing, and the operating force transmitting device In disc brakes with a parking brake, the operating force of the parking brake lever is converted into the rotational force of the rotational shaft of the parking brake lever, and the brake is actuated based on the rotational force. In order to increase the power consumption, it is not possible to adopt a configuration in which a pair of scissor-shaped levers are provided on the rotating shaft and the inner cable and the outer casing are connected to opposing ends of the pair of levers as described above.

Means for Solving the Problems The present invention has been made against the background of the above-mentioned circumstances, and its purpose is to provide a control force transmitting device having an outer casing and an inner cable running vertically through the inside thereof. In a disc brake with a parking brake, the brake is actuated based on the rotational force generated on the rotation shaft of the parking brake lever as the parking brake lever is rotated by an operating force,
The object of the present invention is to suitably utilize the reaction force of the outer casing to ensure even greater rotational force of the rotation shaft. In order to achieve such an objective, the gist of the present invention is to provide a parking brake lever with a rotating shaft, a parking brake lever provided on the rotating shaft so as to be unable to rotate relative to the shaft, and a flexible outer As the parking brake lever is rotated by an operating force transmitted through an operating force transmitting device having a casing and an inner cable longitudinally movable in the axial direction within the outer casing, the parking brake lever is rotated. In a disc brake with a parking brake in which the brake is actuated based on rotational force generated on a driving shaft, one end of the longitudinal parking brake lever with the center of rotation at the intermediate portion and the end of the outer casing, A connecting member is provided that is connected to the parking brake lever at a fixed relative distance in a state that is substantially perpendicular to the parking brake lever, and the inner cable is connected to the other end of the parking brake lever.

Operation and Effects of the Invention In this way, in the disc brake with parking brake configured as described above, the end of the parking brake lever opposite to the side to which the inner cable is connected is connected to the end of the outer casing. Since they are connected at a fixed relative distance by members, when the inner cable is pulled in, the parking brake lever is rotated in the parking brake activation direction by the inner cable, and the damage caused to the outer casing as the inner cable is pulled in is The reaction force is transmitted to the end of the parking brake lever opposite to the inner cable side through the connecting member, and this reaction force also causes the parking brake lever to rotate in the parking brake activation direction. The parking brake lever is rotated in the brake activation direction while a substantially coupled force is applied to two positions located on opposite sides with the rotation axis in between. As a result, even if the distance between the rotation shaft of the parking brake lever and the part to which the inner cable is connected or the operating stroke of the inner cable are reduced, a large rotational force of the rotation shaft, that is, parking brake force can be secured. This further improves braking efficiency.

Furthermore, since the connecting member and the parking brake lever form a substantially right angle, there is less loss of reaction force transmitted from the outer casing to the parking brake lever via the connecting member, making it more suitable for increasing the rotational force of the connecting member. can contribute to

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

FIG. 1 is a schematic diagram of a disc brake with a parking brake to which the present invention is applied, in which a disc rotor 10 is provided rotatably together with wheels etc.
A caliper 12 is attached to the outer periphery of the disc rotor 10.
It is supported in a floating manner by a pair of slide pins (not shown) protruding from a torque plate 14 which is fixed to a non-rotating member (not shown) while straddling it in its thickness direction. The caliper 12 includes a cylinder portion 16 and a connecting portion 18 that extends from one end of the cylinder portion 16 and located on the outer peripheral side of the disc rotor 10 in a direction parallel to its axis.
and a claw portion 20 that extends inward in the radial direction of the disc rotor 10 in a direction substantially perpendicular to the axis of the cylinder portion 16 at the distal end of the connecting portion 18.
It is equipped with A piston 22 is slidably fitted inside the cylinder portion 16 . A pair of pads 24, 2 are provided between the piston 22 and the claw portion 20.
6 are disposed with the disc rotor 10 in between, one pad 24 is supported on the torque plate 14 so as to be movable in the axial direction of the piston 22, and the other pad 26 is The piston 22 is supported movably in the axial direction by the claw portion 20 .

As shown in FIG. 2, a protrusion 29 having a female threaded hole 28 is integrally formed in the center of the top wall 27 of the piston 22 in the axial direction, and the protrusion 29 is connected to the bottom of the cylinder part 16. It is slidably fitted into a through hole 33 formed in the wall 31 in the axial direction of the cylinder portion 16 . An adjustment bolt 37 having an adjustment wheel 35 on its head is screwed into the female threaded hole 28 of the protrusion 29 so as to be relatively rotatable, and the head side of the adjustment bolt 37 projects from the bottom wall 31 by a predetermined distance.

As shown in FIGS. 1 and 2, a pair of support portions 30 (the other not shown) are provided on the bottom wall 31 of the cylinder portion 16 to protrude in a direction parallel to the axis of the cylinder portion 16. A rotation shaft 32 is rotatably supported by the pair of support parts 30 via a bush, a needle bearing, etc. (not shown).
A cam groove 39 is formed in the longitudinal center of the rotation shaft 32, and the cam groove 39 and the adjustment bolt 37
There is a rod-shaped toggle 4 between the center of the tip of the head.
1 is interposed. A parking brake lever 34 having a longitudinal plate shape is integrally fixed to one end of the rotation shaft 32 at its intermediate portion, and a parking brake lever 34 having a longitudinal direction substantially perpendicular to the longitudinal direction of the parking brake lever 34 is fixed to the intermediate portion thereof. Tekatsu rotation shaft 32
A projection 36 is formed that projects a predetermined distance in a direction perpendicular to the direction. Moreover, one support part 30 and the toggle 4
1, there is an adjustment member 43 having a generally disk shape as a whole.
is provided integrally with the rotating shaft 32, and a portion thereof is engaged with the adjustment wheel 35.

When operating the parking brake of such a disc brake, the parking brake lever 3
4 is rotated clockwise in FIG. 2, the toggle 41 moves toward the pad 24 (to the right in FIG. 2) in accordance with the rotational displacement of the cam groove 39 as the rotation shaft 32 rotates. The piston 22 is pushed out, and the thrust is transmitted to the protrusion 29 via the adjustment bolt 37, and the piston 22 is pushed out. As a result, one pad 24 is pressed against one surface of the disc rotor 10, and the caliper 12 is relatively moved in the direction opposite to the piston 22 by the reaction force, and the other pad 26 is pushed against the disc rotor 10 by the claw portion 20. Pressed against the other surface, the disk rotor 1
0 is compressed by a pair of pads 24 and 26 with a predetermined pressing force, and its rotation is suppressed. Note that when the pads 24 and 26 are worn out and the amount of rotation of the parking brake lever 34 exceeds a predetermined amount of rotation, the parking brake lever 34 is activated based on the operation of the adjustment bolt 37, adjustment wheel 35, adjustment member 43, etc. The amount of rotation of the brake lever 34 is automatically adjusted as the brake lever 34 is rotated, but a detailed explanation will be omitted since it is not directly necessary for understanding the present invention.

At both ends of the parking brake lever 34,
An operating force transmission device consisting of an outer casing 38, an inner cable 40, a cap 42, a pressing member 44, etc. is connected. The outer casing 38 is made of a flexible and incompressible member,
A portion of the vehicle body 46 is clamped and arranged in a curved state. In addition, in Figure 1, for ease of understanding,
Outer casing 38 and inner cable 40
The direction of curvature of is shown rotated by a predetermined angle. The inner cable 40 runs longitudinally inside the outer casing 38 so as to be movable in the axial direction, and one end of the inner cable 40 is connected to a parking handle or parking pedal (not shown), and the other end is connected to a parking brake. It is rotatably connected to one end of the lever 34. A cap 42 having a Y-shape as a whole is provided at the distal end of the outer casing 38, and the cap 42 is connected to a first portion 48 through which the inner cable 40 is passed longitudinally and to a substantially central portion in the longitudinal direction of the first portion 48. It has a second portion 50 that protrudes from the bottom at a predetermined angle. The pressing member 44 is made of a non-compressible member, and has one end fixed to the second portion 50 of the cap 42 and the other end connected to the other end of the parking brake lever 34 via a connector 52. The parking brake lever 34 and the pressing member 44 are substantially perpendicular to each other. As a result, the leading end of the outer casing 38 is attached to the other end of the parking brake lever 34 at a fixed relative distance with a fixed distance therebetween. In this embodiment, the pressing member 4
4 constitutes a connecting member. Here, more preferably, the certain distance is approximately equal to the distance between one end of the parking brake lever 34 and the tip of the outer casing 38 when the inner cable 40 is pulled in. The two ends of the lever 34 and the tip of the outer casing 38 are determined to form an isosceles triangle with the tip of the outer casing 38 as its apex. Also, cap 4
A spring 58 that constantly biases the outer casing 38 and the like in a direction away from the parking brake lever 34 is stretched between the locking member 56 and the locking member 56 fixed to the vehicle body 46. The support portion 30 is integrally provided with a protrusion 60 that protrudes in a direction parallel to the axis of the cylinder portion 16, and the tip of the protrusion 60 is connected to the pressing member 44 of the parking brake lever 34. A return spring 6 that constantly biases the parking brake lever 34 in the brake non-operating direction is provided between the side end portion and the vicinity thereof.
2 is stretched, and the support portion 30 is provided with a stopper 64 that prevents the parking brake lever 34 from returning by a predetermined amount or more based on contact with the protrusion 36.

When operating the parking brake of the disc brake with parking brake configured in this way, when the inner cable 40 is pulled in,
The reaction force moves the distal end of the outer casing 38 toward the distal end of the inner cable 40, so that the distal end of the outer casing 38 presses the parking brake lever 34, which is attached to the parking brake lever 34 at a fixed relative distance, via a pressing member 44 or the like. A force in the brake operation direction is also applied to the other end (the upper end in the figure). As a result, the parking brake lever 34
Since a substantially couple of brake operating forces are applied to both ends located on opposite sides of the parking brake lever 34 with the rotation shaft 32 in between, the rotation shaft 32 of the parking brake lever 34 and the inner cable 40 are connected. Even if the distance between the inner cable 40 and the operating stroke of the inner cable 40 is relatively small,
A larger rotational force can be obtained on the rotation shaft 32 compared to the conventional one. As a result, the toggle 41 is attached to the piston 22.
A larger thrust than the conventional one is transmitted through the brakes, etc., and sufficient parking brake force is obtained, and braking efficiency is further improved.

Further, according to this embodiment, since the pressing member 44 and the parking brake lever 34 are substantially perpendicular to each other, the reaction force transmitted from the outer casing 38 to the parking brake lever 34 via the pressing member 44 is Less loss, rotation axis 3
This can contribute more favorably to the increase in rotational force of No. 2. In this way, the effect of increasing the parking brake force by suitably utilizing the reaction force of the outer casing 38 is even greater in a disc brake, which has a smaller braking force than a drum brake.

In addition, in the above-mentioned embodiment, the pressing member 44
The reaction force generated in the outer casing 38 via the connector 52 and the like is applied to the parking brake lever 3.
4, but it does not necessarily have to be configured in this way; for example, the second portion 50 of the cap 42 may be made longer and its tip end connected to the other end of the parking brake lever 34. It is also possible to attach it directly to.

Further, in the above-mentioned embodiment, a disc brake with a parking brake is described which is equipped with a caliper 12 in which the piston 22 etc. are disposed on one side of the disc rotor 10. However, in the present invention, the piston 22 etc. It is also possible to apply the present invention to a disc brake with a parking brake equipped with calipers or the like arranged on both sides of the rotor 10.

In addition, various changes may be made to the present invention without departing from the spirit thereof.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of a disc brake with a parking brake to which the present invention is applied. FIG. 2 is a rear sectional view showing essential parts of the caliper in FIG. 1. 32: Rotating shaft, 34: Parking brake lever, 38: Outer casing, 40: Inner cable, 44: Pressing member (connecting member).

Claims (1)

[Claims for Utility Model Registration] A rotating shaft, and a parking brake lever provided on the rotating shaft so that it cannot rotate relative to the shaft,
The parking brake lever is rotated by an operating force transmitted through an operating force transmitting device having a flexible outer casing and an inner cable longitudinally extending through the outer casing so as to be movable in the axial direction. In a disc brake with a parking brake of the type in which the brake is actuated based on the rotational force generated on the rotational shaft due to A parking brake characterized in that the inner cable is connected to the other end of the parking brake lever, and the inner cable is connected to the other end of the parking brake lever. With disc brake.