JPH0776293A - Automotive brake device - Google Patents

Abstract

PURPOSE:To set a toe-in angle accurately irrespective whether particles are mingled in a brake shoe or not by deforming a toe-in setting member by fastening a fastening mechanism and by bringing the brake shoe into contact with a car wheel rim with the toe-in angle. CONSTITUTION:The mounting angle of a brake shoe 6 in relation to a brake arm is adjusted so that a control surface 6b is brought into contact with a car wheel rim 4 by oscillating the brake shoe 6 in the direction B or C and by oscillating a mounting screw 5a. A nut 5b is fastened, and a mounting shaft part 6a is pressure contacted to a first washer 5b and the first washer 5b to the brake arm by means of the fastening force between the nut 5a and the mounting screw 5a, to fix the brake shoe 6 to the brake arm 4. At the time, a part 10a of a toe-in setting ring 8 is plastically deformed by the fastening force, while the position of the mounting shaft part 6a in relation to the first washer 5b is changed, and the brake shoe 6 is brought into contact with the car wheel rim 4 with a toe-in angle A.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bicycle brake device in which the brake shoe is pressed against the wheel rim by operating the support member of the brake shoe close to the wheel rim. The present invention relates to a brake device having a toe-in angle and enabling contact.

[0002]

2. Description of the Related Art Conventionally, there has been a bicycle brake device described above, for example, in Japanese Utility Model Laid-Open No. 3-62238. That is, a mounting angle adjusting protrusion is provided at the end of the braking surface of the brake shoe, and when the brake shoe is attached to the support member, the adjusting protrusion of the braking surface and the end opposite to the adjusting protrusion are provided. By adjusting the attitude so that the mounting attitude is such that it contacts the wheel rim, the brake shoe comes into contact with the wheel rim with a certain toe-in angle due to the action of the adjusting protrusion, and there is no toe-in angle. The brakes can be operated while preventing unpleasant vibrations and noises that tend to occur.

[0003]

Conventionally, a brake shoe is formed on a shoe into which hard friction particles such as aluminum oxide are mixed, and the hard friction particles effectively operate even when the wheel rim is wet, such as in rainy weather. There was an inconvenience when trying to apply the brakes. That is,
The particle-mixed shoe is made by molding a rubber material mixed with hard friction particles into a predetermined shape with a molding die and vulcanizing it.Therefore, the shoe surface when the brake shoe is completely molded is made of rubber material. Exists, and the hard friction particles are not exposed. For this reason,
When the braking surface is used after being ground so that the hard friction particles are exposed, the hard friction particles sufficiently exhibit the braking action. However, if there is a mounting angle adjustment protrusion on the braking surface, it is necessary to grind the braking surface while preventing the adjustment protrusion from being scraped off, and productivity will be extremely poor. It was. In other words, it was a toe-in setting technology that cannot be applied to particle-mixed shoes. An object of the present invention is to provide a bicycle brake device capable of accurately setting a toe-in angle and performing a brake operation regardless of whether particles are mixed.

[0004]

In the bicycle brake device according to the present invention, in order to achieve the object, the brake shoe is connected to the support member by tightening and connecting the brake shoe to the support member. A toe-in setting member that includes a tightening mechanism and that sets the toe-in angle of the brake shoe is provided so as to be deformable, and is deformed by a tightening operation of the tightening mechanism so that the brake shoe has the toe-in angle. It is characterized in that the brake shoe is attached to the rim so as to be exposed. As the toe-in setting member, either a member that is plastically deformed by the tightening operation of the tightening mechanism or a member that retreats against the elastic protrusion maintenance may be adopted. It is advantageous as follows.

[0005]

When the toe-in setting member is deformed, a difference occurs between the mounting angle of the brake shoe to the supporting member before the deformation and the mounting angle of the brake shoe to the supporting member after the deformation. This difference is a predetermined toe-in angle. The degree of deformation of the toe-in setting member is set so that And the mounting angle of the brake shoe to the support member is
Adjust the mounting angle so that the braking surface contacts the wheel rim over the entire length in the wheel rim rotation direction, mount the brake shoe on the support member, and then tighten the tightening mechanism to tighten the brake shoe. It is fastened and fixed to a support member so that it can be pressed into contact with the wheel rim.
Then, when the brake is operated, the brake shoe comes into contact with the wheel rim with a predetermined toe-in angle. If a member that elastically maintains the projecting posture is adopted as the toe-in setting member, the toe-in setting is performed even after the brake shoe is fixed to the support member by returning the tightening mechanism to the release side to release the brake shoe. The member is again in the protruding posture. That is, even after the brake shoe is clamped and fixed to the support member, the clamp and fixation can be released and the toe-in angle can be reset.

[0006]

The toe-in angle is set based on the posture applied to the wheel rim. That is, since the toe-in angle is set on the basis of the wheel rim, the brake shoe comes into contact with the wheel rim with a predetermined toe-in angle with high accuracy, so that braking can be performed while accurately preventing vibration and noise. I was able to. Moreover, the toe-in setting member is deformed by the tightening force of the tightening mechanism, and is provided on the part other than the braking surface of the brake shoe. As a result, not only when using the brake shoe in which the hard friction particles are not mixed, but also in the case where the hard friction particle is mixed, it is possible to accurately provide the toe-in angle and satisfactorily brake. Further, when a member that is elastically maintained in the protruding posture is used as the toe-in setting member, even if the brake shoe is worn out due to use, the toe-in angle can be reset, which is convenient.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIG. 1, one of a pair of brake arms 1 and 1 is swingable around an axis X on one of a pair of vehicle body frames F, F respectively located on the left and right sides of a wheel W. And the other brake arm 1 is swingably attached to the other body frame F about the axis X, and the free end side of the one brake arm 1 is connected to the brake wire 2 and Brake arm 1
When the free end side of the brake wire 2 is connected to the brake wire 2 via the connecting tool 3, the brake wire 2 becomes in use.
A cantilever type brake device for a bicycle is configured so as to be operated by pulling and loosening. That is, when the brake wire 2 is pulled and the left and right brake arms 1 and 1 are oscillated to the upside, and the free end sides of both brake arms 1 and 1 are approached to the rim 4 of the wheel W, either In the middle part of the brake arm 1,
The brake shoe 6 attached by the tightening mechanism 5 having the attachment screw 5a is pressed into contact with the side surface of the wheel rim 4 so that the brake shoe 6 enters the brake. Then, when the brake wire 2 is loosened and the left and right brake arms 1 and 1 are oscillated downward by the urging action of the return springs 7 provided at the respective base ends, the left and right brake shoes 6 Is separated from the side surface of the wheel rim 4 and the brake is released so as to release the braking application.

As shown in FIG. 2, the tightening mechanism 5 is constructed so that the screw shaft portion is inserted into the screw hole 1a of the brake arm 1, and the mounting shaft portion 6a of the brake shoe 6 is attached.
The mounting screw 5a configured to be inserted into the shoe mounting hole of the head, and a cylindrical shape that is positioned between the brake arm 1 and the mounting shaft portion 6a so as to be externally fitted to the head of the mounting screw 5a. A first washer 5b formed on the second side, a second washer 5c and a nut 5d which are formed on the opposite side of the first washer 5b with respect to the brake arm 1 so as to be mounted on the screw shaft portion of the mounting screw 5a. Configured. As shown in FIG. 3, a resin toe-in setting ring 8 formed in an annular shape so as to be externally fitted to a mounting portion 5e having an outer diameter on one end side of the first washer 5b smaller than the other end side is attached to the tightening mechanism 5. When the brake shoe 6 is mounted on the brake arm 1 based on the mounting procedure shown in FIG. 2, the brake shoe 6 contacts the wheel rim 4 with a predetermined toe-in angle A by the action of the toe-in setting ring 8. It is configured to do.

That is, as shown in FIG. 3, two first notches 9a and 9b are provided on one end side of the toe-in setting ring 8,
Two second notches 10a and 10b are provided. When the mounting shaft portion 6a of the brake shoe 6 is inserted into the head of the mounting screw 5a, the toe-in setting ring 8 is attached to the first washer 5b.
The mounting shaft 6a is rotationally adjusted with respect to the first notch 9a or 9b, and the second notch 10a or 10 is aligned with the first notch 9a or 9b.
The second notch 10 is formed on the tip side so as to enter with b.
Try to get into a and 10b. It is preferable to make the toe-in angle A different depending on properties such as the surface finish of the wheel rim 4, and when making the toe-in angle A large, the notch depth of the second notches 10a and 10b having different notch depths. When the mounting shaft portion 6a enters the shallower portion 10b and the toe-in angle is reduced, the mounting shaft portion 6a is adjusted so as to enter the second notch 10a having the deeper notch depth.

Next, the nut 5d is tightened insufficiently, and the tightening mechanism 5 is brought into the shoe mounting state shown in FIG. In this state, the first notch 9
2a, the mounting shaft 6a is inclined with respect to the first washer 5b due to the difference in the notch depth of the second notches 10a, 10b. 1 and enables adjustment of the mounting angle of the brake shoe 6 with respect to the brake shoe 1. That is, the pressure contact between the first washer 5b and the brake arm 1 due to the tightening force between the nut 5d and the mounting screw 5a and the pressure contact between the mounting shaft portion 6a and the first washer 5b are weak, so that the brake shoe 6 is moved to the brake arm 1. 2A, the rocking can be adjusted in the direction of arrow B or C in FIG. 2A.
A washer receiving surface 1b acting on the washer 5b, and a second
Due to the curved surface of the washer receiving surface 1c acting on the washer 5c, the mounting screw 5a swings laterally with respect to the brake arm 1 and the mounting angle of the brake shoe 6 with respect to the brake arm 1 changes. Then, as shown in FIG. 2A, the attachment angle of the brake shoe 6 to the brake arm 1 is set so that the braking surface 6 b of the brake shoe 6 is the wheel rim 4.
To contact the wheel rim 4 over its entire length in the direction of travel of the.

When the adjustment of the mounting angle is completed, the nut 5d is rotated toward the tightening side to move the tightening mechanism 5 to the position shown in FIG.
Put the shoe in the state shown in (b). In this state, the mounting screw 5a attaches the mounting shaft 6a to the first washer 5
b and by strongly pressing the first washer 5b against the washer receiving surface 1b of the brake arm 1 so that the brake shoe 6 does not move even if a contact reaction force from the wheel rim 4 acts. Fixed to 1. At this time, the tightening force of the mounting screw 5a and the nut 5d acts on the inside of the second notch 10a or 10b of the toe-in setting ring 8 via the mounting shaft portion 6a, and the toe-in setting ring 8 moves to the first washer 5b. The mounting portion 5e
It is supported by and is made of resin and the notches 11a and 11b for facilitating the deformation facilitate plastic deformation, which corresponds to the tip end side of the mounting shaft portion 6a of the toe-in setting ring 8. The part is plastically deformed from the state before the shoe is tightened in FIG. 2A to the state after the shoe is tightened in FIG.
From the position shown in Fig. 2 (a)
Change to the posture of (b). As a result, the toy setting ring 8 sets the state in which the brake shoe 6 is attached to the brake arm 1 to the state shown in FIG. That is,
When a brake operation is performed, the brake shoe 6 has a toe-in angle A determined by the deformation of the toe-in setting ring 8 and is in an attached state in which the brake shoe 6 contacts the wheel rim 4.

Incidentally, the second notch 1 of the toe-in setting ring 8
The notch depths of 0a and 10b may be formed to be the same. In this case, even if the toe-in setting ring is plastically deformed at one of the second notches 10a or 10b due to the tightening and fixing of the brake shoe 6 by the tightening mechanism 5, after the fixing of the brake shoe 6 to the brake arm 1 is released. Even when re-fixing the brake shoe 6, the second notch 1 which remains without being plastically deformed when the shoe is previously fixed
The toe-in angle can be reset using 0b or 10a. That is, it is advantageous that the toe-in angle can be set by using the toe-in setting member again. Further, when the toe-in setting ring 8 is released from the fastening fixing of the brake shoe 6 to the brake arm 1 by the fastening mechanism 5,
The configuration may be implemented by elastically restoring the shoe attachment state of (b) to the shoe attachment state of FIG. In this case, after releasing the fixing of the brake shoe 6 to the brake arm 1, when the brake shoe 6 is fixed again, the toe-in angle can be set by using the toe-in setting ring again.

In the pipe member 12 shown in FIG. 1, when the brake wire 2 is slidably inserted and the brake is operated to be operated, one end of the brake arm 2 is pulled due to the pulling action of the brake wire 2. 1, and the other end is in contact with the connecting member 3 and the connecting member 3a of the brake wire 2,
It acts so as to stretch so that the distance L1 between the brake arm 1 and the connecting member 3a becomes a set length. The brake wire 2 is slidably inserted through the connecting member 3a,
When the brake operation is performed, the distance L1 between the one brake arm 1 and the connecting member 3a becomes equal to the distance L2 between the other brake arm 1 and the connecting member 3a due to the tensioning action of the pipe member 12. As a result, the left and right brake shoes 6, 6 simultaneously act on the wheel rim 4 with equal pressure.

[Embodiment] FIG. 4 shows a bicycle brake device having another structure. As in the brake device of FIG. 1, a brake wire 2 is used to swing the vehicle body frame F around an axis X. A support member 13 is attached to the brake arm 1, and a mounting screw 15 is attached to the support member 13.
The brake shoe 6 by the tightening mechanism 15 having a
The brake shoe 6 is configured to be mounted on the brake arm 1 by mounting the brake shoe 6, and the brake shoe 6 is configured to be pressed against the wheel rim 4 when the brake arm 1 approaches the wheel rim 4. .

The support member 13 is constructed so as to be tightened and fixed to the brake arm 1 by a mounting screw 14. A screw hole 13e for the mounting screw 14 of the support member 13 is formed in an arc-shaped elongated hole centered on the swing axis X of the brake arm 1, and the support member 13 is inserted into the brake arm 1. By forming the inner wall surface 16 of the formed support member mounting recess so as to guide the support member 13, the support member 13 swings with respect to the brake arm 1 about the swing axis X. The sliding position is adjusted by adjusting the mounting position of the brake shoe 6 with respect to the brake arm 1 and adjusting the distance between the brake shoe 6 and the wheel rim 4 when the brake is applied, so-called shoe clearance. I am doing it.

As shown in FIG. 5, the tightening mechanism 15 is mounted on the mounting shaft portion 6a of the brake shoe 6 which is configured to be inserted into the shoe supporting portion 13a of the supporting member 13, and the mounting shaft portion 6a. Washer 15
b and the mounting screw 15a. As shown in FIG. 5, a toe-in setting tongue portion 6c is integrally formed at a portion of the back portion of the brake shoe 6 corresponding to the shoe receiving surface 13b of the shoe support portion 13a. Based on this, when the brake shoe 6 is attached to the brake arm 1, the brake shoe 6 contacts the wheel rim 4 with a predetermined toe-in angle A by the action of the toe-in setting tongue piece 6c. .

That is, as shown in FIG. 5 (a), the brake shoe 6 is mounted on the support member in a mounting posture in which the toe-in tongue portion 6c is located on the rear side in the moving direction of the wheel rim 4 with respect to the mounting shaft portion 6a. Attach to 13.

Next, the tightening of the mounting screw 15a is made insufficient, and the tightening mechanism 15 is brought into the shoe mounting state shown in FIG. In this state, the brake shoe 6 is attached to the support member 13 at an attachment angle such that there is a gap between the back surface 6d of the brake shoe 6 and the shoe receiving surface 13b for erecting the toe-in setting tongue portion 6c, and The mounting angle of the brake shoe 6 with respect to the support member 13 can be adjusted. That is, since the pressing force of the brake shoe 6 against the shoe receiving surface 13b due to the tightening force of the mounting screw 15a is weak, and the diameter of the shoe mounting hole 13c of the shoe support portion 13a is larger than the outer diameter of the mounting shaft portion 6a. As a result, the brake shoe 6 can be oscillated and adjusted with respect to the support member 13 in the arrow B or C direction of FIG. 5 (a). Change. Then, as shown in FIG. 5 (a), the mounting angle of the brake shoe 6 with respect to the support member 13 is set so that the braking surface 6b of the brake shoe 6 contacts the wheel rim 4 over the entire length in the moving direction of the wheel rim 4. Adjust.

When the adjustment of the mounting angle is completed, the mounting screw 15a is rotated toward the tightening side to bring the tightening mechanism 15 into the shoe mounting state shown in FIG. In this state, the tightening force of the mounting screw 15a causes the rear surface 6d of the brake shoe 6 to move to the shoe receiving surface 13
The brake shoe 6 is fixed to the support member 13 so as not to move even if the contact reaction force from the wheel rim 4 acts by being strongly pressed against b. At this time, the mounting screw 15a
When the toe-in setting tongue portion 6c is pressed against the shoe receiving surface 13b by the tightening force by, the toe-in setting tongue portion 6c elastically deforms to the lying position and enters the storage recess 6e of the brake shoe 6. Therefore, there is no gap between the back surface 6d of the brake shoe 6 and the shoe receiving surface 13b of the support member 13, and the mounting posture of the brake shoe 6 with respect to the support member 13 is changed from the posture shown in FIG. Change in posture. As a result, the toy setting tongue portion 6c sets the state where the brake shoe 6 is attached to the support member 13 to the state shown in FIG. That is, when a brake operation is performed, the brake shoe 6 has an attached state in which the brake shoe 6 has a toe-in angle A determined by elastic deformation of the toe-in setting tongue portion 6c and comes into contact with the wheel rim 4.

In the case of this toe-in setting structure, when the fastening fixing of the brake shoe 6 to the support portion 13 by the fastening mechanism 15 is released, the toe-in setting tongue portion 6c is moved to the position shown in FIG.
The fallen posture of (b) is elastically restored to the standing posture of FIG. That is, when the brake shoe 6 is refastened and fixed to the support member 13, the toe-in angle A can be reset by using the toe-in setting tongue portion 6c, which is advantageous.

[Another Embodiment] FIG. 6 shows another embodiment structure for setting the toe-in angle applied to the brake device shown in FIG.
That is, the shoe receiving surface 1 is attached to the support portion 13a.
The holding hole 16 is formed in the portion 13d forming 3b,
The toe-in setting ball 17 and the coil spring 18 are installed in the holding hole 16, and the toe-in setting ball 1 is attached by the stopper 19 attached to the support portion 13d.
7 and the coil spring 18 are held by the coil spring 18 in such a manner that the toe-in setting ball 17 is partly projected from the through hole of the stopper 19 to the outside of the holding hole 16 so as not to fall off. The toe-in setting ball 17 is used for setting the toe-in angle A instead of the toe-in setting tongue piece 6c.

That is, when the tightening mechanism 15 is in an attached state that allows the attachment angle of the brake shoe 6 to be changed with respect to the support member 13, the toe-in setting ball 17 projects due to the coil spring 18 as shown in FIG. While maintaining the posture, the toe-in setting tongue piece portion 6c of FIG. 5 (a) acts to support one end side of the back surface 6d of the brake shoe 6. Accordingly, when the mounting angle of the brake shoe 6 to the support member 13 is adjusted so that the braking surface 6b of the brake shoe 6 contacts the wheel rim 4 over the entire surface, the rear surface 6d of the brake shoe 6 and the support portion 1 are provided.
A gap similar to that shown in FIG. 5A is formed between the shoe receiving surface 13b of 3a. Then, when the tightening mechanism 15 is operated to be tightened in a state where the brake shoe 6 is fixed to the support portion 13 so that the brake operation is possible, the toe-in setting ball 17 elastically deforms the coil spring 18 due to the tightening force of the tightening mechanism 15. And retreat into the holding hole 16. As a result, as in FIG. 5B, the gap between the back surface 6d of the brake shoe 6 and the shoe receiving surface 13b of the support portion 13a is eliminated, and the mounting state of the brake shoe 6 on the support member 13 is the brake during the brake operation. Shoe 6 has toe-in angle A and wheel rim 4
It comes into contact with the attached state.

The ball 17 may be implemented by changing various concrete shapes such as pins and rollers. Alternatively, the coil spring 18 may be replaced by a leaf spring or a spring member made of rubber or resin. Therefore, the coil spring 18 and the like are collectively referred to as the elastic member 18.

In the case of this toe-in setting structure, when the tightening and fixing of the brake shoe 6 to the support portion 13 by the tightening mechanism 15 is released, the toe-in setting ball 17 is elastically restored to the projecting position from the retracted position in the holding hole 16.
That is, when the brake shoe 6 is refastened and fixed to the support member 13, the toe-in angle A can be reset by using the toe-in setting ball 17, which is advantageous. Furthermore, since the toe-in setting ball 17 is mounted on the brake arm 1, even when the brake shoe is replaced with another brake shoe due to wear or the like,
You can use it to set the toe-in angle A. That is, the brake shoe, which is a consumable item, can be attached to the brake arm with the toe-in angle A while being manufactured as an inexpensive one having no toe-in setting configuration.

In constructing the brake device and the toe-in setting structure shown in FIGS. 5 and 6, the toe-in setting tongue portion 6c or the toe-in setting ball 17 moves the wheel rim 4 with respect to the mounting shaft portion 6a of the brake shoe 6. It is provided so as to be located or to act at a position located on both the front side and the rear side. Then, of the pair of tongue pieces 6c, 6c or the balls 17, 17, the one located on the rear side in the wheel rim movement direction is located closer to the front side than the one located on the front side.
It is configured to deform a lot with the tightening operation of 5,
The toe-in angle A may be set by the difference in deformation of the pair of tongue portions or the ball, and the shoe clearance may be set by the deformation of any of the tongue portions or the ball. Then, it is advantageous that both the toe-in angle and the shoe clearance can be set at once by simply fastening and fixing the brake shoe to the brake arm.

The present invention can be applied to side pull type and center pull type caliper brakes in addition to the cantilever type. Further, the present invention can be applied to a brake configured such that the brake shoe is pressed against the wheel rim by sliding the support member of the brake shoe in the lateral direction of the vehicle body. Therefore, the brake arm 1 is simply referred to as the support member 1.

It should be noted that reference numerals are added to the claims for convenience of comparison with the drawings, but the present invention is not limited to the configurations of the accompanying drawings by the entry.

[Brief description of drawings]

[Figure 1] Front view of the entire cantilever brake for a bicycle

FIG. 2 is an explanatory diagram showing a brake shoe mounting procedure.

FIG. 3 is a perspective view of a toe-in setting ring.

FIG. 4 is a front view of the entire cantilever brake for a bicycle according to another embodiment.

FIG. 5 is an explanatory view showing a brake shoe mounting procedure of another embodiment.

FIG. 6 is a sectional view of another toe-in setting structure.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Support member 4 Wheel rim 5,15 Tightening mechanism 6 Brake shoe 6c, 8, 17 Toe-in setting member 16 Holding hole 18 Elastic member

Claims (4)

[Claims] 1. A support member (1) for a brake shoe (6).
A brake device for a bicycle, wherein the brake shoe (6) is pressed into contact with the wheel rim (4) by operating the wheel closer to the wheel rim (4), the brake shoe (6) being supported by the support member (1). Tightening mechanism (5,
15), the toe-in setting member (6c, 8, 17) for setting the toe-in angle (A) of the brake shoe (6) is provided so as to be deformable, and by the tightening operation of the tightening mechanism (5, 15). A bicycle brake device configured to be deformed so that the brake shoe (6) has the toe-in angle (A) and is brought into contact with the wheel rim (4) to expose a brake shoe attached state. 2. The toe-in setting member (6c, 8, 1)
The bicycle brake device according to claim 1, wherein 7) is a member that is plastically deformed by the tightening force of the tightening mechanism (5, 15). 3. The toe-in setting member (6) is elastically maintained in a protruding posture, and the tightening mechanism (5, 1).
The bicycle brake device according to claim 1, wherein the bicycle brake device is a retractable member that is retracted by the tightening force of 5). 4. The toe-in setting member (17) is removably held in a holding hole (16) formed in the supporting member (1), and an elastic member () located in the holding hole. 1
The bicycle brake device according to claim 3, wherein the toe-in setting member (17) is maintained in a protruding posture by 8).