JP2004211844A - Disc brake device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent the application of load in braking operation to a member relating to the adjustment of a clearance between a frictional pad and a disc in a disc brake device. <P>SOLUTION: In this disc brake device 10 wherein the rotating motion of a brake lever 17 is converted into the linear motion through a cam mechanism and transmitted to the frictional pad 12, and the frictional pad 12 is pressed to the disc 11 to brake the disc, a nut member 19 for adjusting the clearance is provided with a gear 31. The brake lever 17 is provided with a first claw 32 for allowing the nut member 19 to rotate only in the fastening direction, and a second claw 36 for rotating the gear 31 in the fastening direction in interlocking with the rotating motion of the brake lever 17. When the clearance is expanded, the nut member 19 is rotated in the fastening direction by the second claw 36 to adjust the clearance. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a disc brake device applied to, for example, an automobile, and more particularly, to a gap adjusting technique capable of appropriately and automatically adjusting a gap between a friction pad and a disc.
[0002]
[Prior art]
In a disc brake device applied to a vehicle, when a gap between a friction pad and a disc increases due to wear of the friction pad, an adjuster mechanism for automatically adjusting the gap to an appropriate value. It has. A disc brake device provided with such an adjuster mechanism is disclosed in, for example, Patent Document 1.
The disc brake device described in Patent Literature 1 is configured such that a friction pad is formed on a disc by rotating a screw through a brake lever pivotally operated by a brake operation member, a pawl provided on the brake lever, and a gear meshing with the pawl. The disc is pressed or pulled apart to brake or release the disc. If the gap between the disc and the friction pad is within the range of the appropriate gap, the pawl and the gear are integrally rotated without changing the meshing position. When the gap increases, the gear stops at a predetermined position when the brake lever is rotated in the brake release direction, but the pawl is further rotated by an amount corresponding to the increase in the gap, so that the pawl is rotated. In this configuration, the meshing position is changed with respect to the gear, and thereby the gap is adjusted.
[0003]
[Patent Document 1]
Japanese Patent Application Laid-Open No. 50-33367
[Problems to be solved by the invention]
However, the above-described conventional disk brake device has a configuration in which claws and gears provided for gap adjustment are incorporated in a power transmission system from a brake lever to a screw. For this reason, in the case of a screw type using a square screw, which is frequently used, the frictional resistance during rotation is large, so that a large load is always applied to the gears and claws during the brake operation.
[0005]
SUMMARY OF THE INVENTION The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a disk brake device with a member for adjusting a gap between a friction pad and a disk when a brake is operated. It is an object of the present invention to provide a technique for preventing the load of the device from acting.
[0006]
[Means for Solving the Problems]
To achieve the above object, a cylinder control device according to the present invention is configured as described in claim 1 of the claims. The invention according to claim 1 is a brake lever that is rotated by a brake operating member, and converts the rotation of the brake lever into a linear motion and transmits the linear motion to a friction pad, and presses the friction pad against a disc. In a disc brake device including a cam mechanism and a biasing means for biasing a friction pad in a direction to separate the friction pad from a disk, a load at the time of a brake operation acts on a member related to a clearance adjustment between the friction pad and the disk. It is a technique that is not done.
[0007]
The disc brake device according to claim 1, wherein the disc brake device is provided so as to be rotatable in only one direction, and a gap with a gear for adjusting a gap between the disc and the friction pad by an axial movement accompanying the rotation. It has an adjusting member and a claw attached to the brake lever and meshing with a gear of the clearance adjusting member. When the gap between the disc and the friction pad becomes large, the pawl gets over the tooth when the brake lever rotates in the brake operating direction, meshes with the next tooth, and rotates the brake lever in the brake release direction. The gap adjusting member is rotated during movement to adjust the gap between the friction pad and the disk.
That is, according to the first aspect of the present invention, the gear is rotated by the pawl only when the gap between the disk and the friction pad is adjusted by the gap adjusting member. For this reason, a large load due to braking does not act on the pawls and the gears during normal brake operation, which is effective in improving the durability of the pawls and the gears.
[0008]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a front view of the disc brake device according to the present embodiment, and FIG. 2 is a cross-sectional view along the line II-II in FIG. FIG. 3 is a view taken in the direction of the arrow III in FIG.
[0009]
As shown in the drawing, a disc brake device 10 according to the present embodiment includes a disc 11 that rotates integrally with a wheel of an automobile, and a pair (two) of friction pads that are arranged to face each other with the disc 11 interposed therebetween. And 12. The friction pad 12 includes a pad portion (lining material) 13 that comes into frictional contact with the disk 11 and a metal pad plate 14 that supports the back side of the pad portion 13. A bracket 15 is fixed to a part of the vehicle body, and a pad plate 14 is attached to a support shaft 16 attached to the bracket 15 so as to be individually movable in the axial direction. One (right side in FIG. 2) pad plate 14 (hereinafter referred to as right side pad plate) is prevented from coming off by a flange 16 a formed at one end of the support shaft 16.
[0010]
A brake lever 17 is attached to the other end side of the support shaft 16 so as to be rotatable and axially movable. One end of the brake lever 17 is connected to a mechanical linking means 17a such as a cable or a link mechanism. Through a brake operating member (not shown). When the brake lever 17 is turned by the brake operating member, the turning operation of the brake lever 17 is converted to a linear operation via the cam mechanism 18 and transmitted to the friction pad 12, and the pad of the friction pad 12 is moved. The portion 13 is configured to be pressed against the disk 11 to perform braking.
[0011]
As shown in FIGS. 2 and 3, the cam mechanism 18 has a substantially rectangular plate cam portion 18 a formed near the center of rotation of the brake lever 17 and two cam members 18 abutting the plate cam portion 18 a. Ball 18b. The ball 18b is held by a hemispherical concave portion 14a formed outside the other (left side in FIG. 2) pad plate 14 (hereinafter referred to as a left side pad plate). In a normal brake release state in which the pad portion 13 of the friction pad 12 is separated from the disk 11, the ball 18b is engaged with the valley bottom 18c of the plate cam portion 18a, and when the brake lever 17 is rotated, the slope 18d Presses the ball 18b. At this time, a reaction force acts on the brake lever 17 in the axial direction. The reaction force is received by a nut member 19 attached to the support shaft 16.
That is, when the brake lever 17 is rotated, the left pad plate 14 is pushed by the inclined surface 18d of the plate cam portion 18a via the ball 18b, and the right side is pushed via the nut member 19 and the support shaft 16 which receive the reaction force. By pulling the pad plate 14, the disk 11 is sandwiched between the pad portions 13 and braking is performed.
[0012]
Between the left and right pad plates 14, a coil spring 20 is provided as urging means for urging the pad portion 13 in a direction to separate the pad portion 13 from the disk 11 when the brake is released. Thus, in the brake released state, the pad portion 13 is held at a position separated from the disk 11. A substantially central portion of the pad plate 14 is supported by a support shaft 16. The pad plate 13 is provided on one side of the support shaft 16, and the balance mechanism 21 is provided on the other side. The balance mechanism 21 is configured to have an adjustment function for adjusting the pad portion 13 of the friction pad 12 so as to be flat against the disk 11 during braking.
[0013]
Next, the adjuster mechanism 30 that automatically adjusts the gap C between the friction pad 12 and the disc 11 to an appropriate gap when the friction pad 12 is worn in the disc brake device 10 configured as described above will be described. As shown in FIGS. 1 and 2, the adjuster mechanism 30 includes a nut member 19, a gear 31 formed on the outer periphery of the nut member 19, a first claw 32 and a second claw 36 meshing with the gear 31. It is composed of The nut member 19 meshes with a screw portion 16 b formed on the support shaft 16. By rotating the nut member 19 in the tightening direction (leading direction), the left and right pads are moved via the cam mechanism 18 and the support shaft 16. The plates 14 can be moved in directions approaching each other. That is, by rotating the nut member 19, the gap C between the friction pad 12 and the disk 11 is adjusted, and the nut member 19 corresponds to the geared gap adjusting member according to the present invention. The direction in which the nut member 19 is tightened and the direction in which the brake lever 17 is released are the same rotation direction.
[0014]
The first claw 32 is provided as one-way means for preventing the nut member 19 from turning only in the tightening direction. The first claw 32 is rotatably attached to the rotation center side of the brake lever 17 via a support shaft 33, and is prevented from rotating in one direction by a stopper 34 fixed to the brake lever 17. Further, the torsion spring 35 urges the gear 31 in a direction in which it engages with the gear 31, and is in contact with the stopper 34. Thereby, the rotation of the nut member 19 in the tightening direction is allowed and the rotation in the opposite direction is prevented.
[0015]
The second claw 36 is provided as a tightening means for rotating the nut member 19 in a tightening direction in conjunction with the rotation operation of the brake lever 17. That is, the second claw 36 is rotatably attached to the position at a predetermined distance from the rotation center of the brake lever 17 via the support shaft 37, and is attached in a direction in which the second claw 36 meshes with the gear 31 by the torsion spring 38. It is being rushed. When the brake lever 17 is turned in the brake operation direction (the direction of the arrow P shown in FIG. 1), the brake lever 17 is pushed away from the teeth by the teeth of the gear 31, and when the brake lever 17 turns in the opposite direction, The gear 31 can be rotated.
The teeth of the gear 31 maintain the gap C between the pad portion 13 and the disk 11 in a predetermined and appropriate manner so that when the brake lever 17 is rotated by a predetermined stroke amount, the pawl 36 does not climb over the teeth. Is set to
[0016]
The adjuster mechanism 30 according to the present embodiment is configured as described above. Therefore, when the pad portion 13 of the friction pad 12 is worn by repeated braking, and the gap C between the pad portion 13 and the disk 11 gradually increases, the amount of rotation when the brake lever 17 is rotated in the brake operating direction is increased. Will gradually increase. As a result, the amount of movement of the second pawl 36 also increases, and eventually, one tooth of the gear 31 gets over and meshes with the next tooth. When the brake lever 17 returns, the gear 31 is rotated by the second pawl 36. That is, the nut member 19 is rotated in the tightening direction, whereby the right and left friction pads 12 are moved in the direction approaching each other via the cam mechanism 18 and the support shaft 16, and the gap C is adjusted. You.
[0017]
As described above, according to the present embodiment, it is possible to automatically adjust the gap C between the pad portion 13 and the disk 11 due to the wear of the pad portion 13. In particular, in the present embodiment, the gear 31 and the second claw 36 for turning the gear 31 in the tightening direction are configured to be rotated only when actually adjusting the gap. An axial reaction force generated when the friction pad 12 is pressed against the disk 11 is received by the nut member 19. For this reason, it is possible to prevent the load associated with the brake operation from acting on the gear 31 and the second claw 36 that constitute the adjuster mechanism 30. As a result, the durability of the gear 31 and the second claw 36 can be improved. Further, since the brake operation method uses the cam mechanism 18, that is, the ball 18b converts the rotation operation into a linear operation by rolling on the slope 18d of the plate cam portion 18a, the resistance at the time of the brake operation is reduced. The brake operation can be performed lightly with little.
[0018]
Further, in the present embodiment, the first claw 32 and the second claw 36 are attached to the brake lever 17 and the gear 31 is formed on the nut member 19, so that, for example, the nut member is manually tightened. The adjuster mechanism 30 of the present invention can be easily mounted on a disc brake device provided with a manually adjustable adjuster mechanism for adjusting the gap. That is, by simply replacing the brake lever and the nut member of the disc brake device with the manually adjustable adjuster mechanism with those of the present invention, it can be easily converted to the automatic adjustable adjuster mechanism.
[0019]
【The invention's effect】
As described above in detail, according to the present invention, in a disc brake device, a technique is provided in which a load at the time of a brake operation is not applied to a member related to adjustment of a clearance between a friction pad and a disc. can do.
[Brief description of the drawings]
FIG. 1 is a front view of a disc brake device according to an embodiment.
FIG. 2 is a sectional view taken along the line II-II in FIG.
FIG. 3 is a view taken in the direction of the arrow III in FIG. 1;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 ... Disc brake device 11 ... Disc 12 ... Friction pad 13 ... Pad part 14 ... Pad plate 16 ... Support shaft 17 ... Brake lever 18 ... Cam mechanism 19 ... Nut member 30 ... Adjuster mechanism 31 ... Gear 32 ... First claw 36 ... Second nail C ... Gap

Claims (1)

A brake lever that is rotated by a brake operating member, a cam mechanism that converts the rotation of the brake lever into a linear motion and transmits the friction pad to the friction pad, and presses the friction pad against the disc, and separates the friction pad from the disc A disc brake device comprising: urging means for urging in a direction,
A gap adjusting member provided with a gear for adjusting a gap between the disc and the friction pad by an axial movement caused by the rotation, and attached to the brake lever; And a claw that meshes with the gear of the gap adjusting member, and the claw rotates in a brake operating direction of the brake lever when a gap between the disc and the friction pad increases. A disc that is configured to adjust the gap between the friction pad and the disc by rotating the gap adjusting member when the brake lever is rotated in the brake releasing direction, sometimes overriding the teeth and meshing with the next tooth. Braking device.

Images