JPS5825894B2 - Vehicle disc brake device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a disc brake device for a vehicle such as a motorcycle, in particular a brake caliper attached to a fixed bracket via two sliding pins so that the brake caliper can be moved parallel to the axis of rotation of the brake disc. The present invention relates to a disc brake device of a supported type.

In the conventional device mentioned above, in order to secure a work space for pad replacement, generally one of the two sliding pins is disconnected from the bracket, and then the brake caliper is installed around the other sliding pin. However, since the device is installed in a limited space in a vehicle, it may not be possible to rotate the brake caliper around the sliding pin. do not have sufficient working space for changing pads.

Therefore, pad replacement work is sometimes performed with the entire brake caliper completely separated from the bracket, but in this case, it is necessary to separately remove the two sliding pins from the bracket or caliper to which they are connected and fixed. There is, and the work is troublesome.

In the conventional device described above, an elastic bushing is interposed between the fitting surface of one of the sliding pins and its pin hole as a means for absorbing manufacturing errors in the distance between the axes of the two sliding pins. However, this elastic bushing is not easy to mold and is expensive, and has the disadvantage that the allowable manufacturing error range is relatively small.

The present invention has been proposed in view of the above, and can eliminate all the drawbacks of the conventional devices, and moreover, can effectively reduce the noise or braking noise caused by the vibration of the brake caliper during driving or braking. The purpose of the present invention is to provide an extremely easy and low-cost device for attaching and detaching the caliper, which is capable of controlling the caliper, and is characterized by a bracket that is fixed to the vehicle body adjacent to the brake disc that rotates together with the wheel. and a pair of arm parts that straddle a pair of friction pads arranged on both sides of the brake disc,
It consists of a brake caliper that has a pressing mechanism on one arm that can press the back surface of one friction pad, and is detachably fixed to the side surface of one end of the brake caliper and extends parallel to the rotation axis of the brake disc. A sliding pin is fitted into a pin hole spaced between two brackets, and a U-shaped notch is formed at the other end of the brake caliper, the bottom of which is approximately oriented toward the sliding pin, and the bracket is inserted into the notch. A detent pin, which is fixed to the detent pin and extends parallel to the sliding pin, is fitted with a clearance, and further, an intermediate portion is made to straddle a portion of the outer periphery of the detent pin that faces the notch bottom. Both ends of a chevron-shaped wire spring are engaged with both inner surfaces of the notch, and the other end of the brake caliper is floatingly supported on a detent pin via the springs.

Hereinafter, the case where the present invention is implemented in a disc brake device for the front wheel of a motorcycle will be explained with reference to the drawings. 1 is a brake disc that rotates together with the front wheel (not shown) of the motorcycle, and 2 is a brake disc that is fixed to the front wheel of the motorcycle. The bracket has two arm parts 2a whose tips are bent so as to straddle the outer circumference of the brake disc 1 from side to side.
, 2b, and between these arm portions 2a and 2b are friction pads 3.3 disposed on both sides of the brake disc 1.
' is installed slidably in the axial direction of the brake disc 1.

A brake caliper 4 has a pair of left and right arm parts 5, 5' that straddle both friction pads 3, 3', and a hydraulic cylinder 6 is formed in the right arm part 5, and an operating piston 7 that fits therein is formed in the right arm part 5. is brought into contact with the back surface of the friction pad 3.

The arm portion 5 has ears 8 and 8' at the upper and lower portions, and a sliding pin 9 parallel to the rotational axis of the brake disc 1 is fixed to the side surface of the upper ear portion 8 with a bolt 10. Bracket 2
It is inserted into the bottle hole 11 bored in the upper end of the arm part 2a.

At that time, after applying lubricating oil to the sliding surface of the sliding pin 9,
That part is sealed by a bellows 12 stretched between the base end of the sliding pin 9 and the bracket 2.

On the other hand, a U-shaped notch 13 is formed in the lower ear portion 8', the bottom of which is directed upward, that is, approximately toward the sliding pin 9, and which opens downward. Engaging the fixed rotation stopper 14 with sufficient play,
Further, both ends of a chevron-shaped wire spring 16 whose middle portion straddles the upper half of the pin 14 are elastically engaged with retaining grooves 17.degree. 17 opened on both inner surfaces of the notch 13.

Thus, the rotation stopper 14 supports the lug 8' in a floating manner via the chevron wire spring 16 to prevent the brake caliper 4 from rotating around the sliding pin 9.

In the figure, reference numeral 18 is a pressing spring that suppresses the vibration of the friction pads 3, 3', and 19 is a pressure oil inlet of the hydraulic cylinder 6, through which pressure oil is introduced into the hydraulic cylinder 6 from a brake mask cylinder (not shown). is supplied.

Next, to explain the operation of this embodiment, when the button shown in FIG. while brake disc 1
Then, due to the reaction, the brake caliper 4 moves to the right while sliding the sliding pin 9 within the pin hole 11 to press the friction pad 3' against the left side surface of the brake disc 1.

At this time, the spring 16 whose both ends are connected to the ears 8' of the brake caliper 4 is elastically deformed, or the detent pin 1
4 and does not impede the movement of the brake caliper 4 in any way.

Thus, when braking is applied to the brake disc 1, the braking torque is supported by the bracket 2 that supports the friction pads 3, 3', and does not substantially act on the brake caliper 4, so that the sliding pin 9 has a side surface that is slightly bent. Therefore, the above-mentioned movement of the brake caliper 4 is performed even more smoothly, and both friction pads 3
, 3' against the brake disc 1 can be reliably balanced to provide effective braking.

To replace the worn friction pads 3, 3', first remove the bolts 10, disconnect the ears 8 and the sliding pins 9,
Then, when the brake caliper 4 is pulled up, the notch 13 of the ear portion 8' is removed from the rotation stop pin 14, and the friction pads 3, 3' are subsequently exposed.

Therefore, the friction pads 3, 3' are removed from the bracket 2 and replaced with new parts.

After replacement, the brake caliper 9 is assembled to the bracket 2 in the opposite manner to the above.

As described above, according to the present invention, the bracket 2 is fixed to the vehicle body adjacent to the brake disc 1 that rotates together with the wheel, and the pair of friction pads 3 and 3' disposed on both sides of the brake disc 1 are straddled. It consists of a brake caliper 4 having a pair of arm parts 5, 5', one arm part 5 of which is equipped with a suppression mechanism capable of pressing the back surface of one friction pad 3, and one end side surface of the brake caliper 4. A sliding pin 9 that is removably fixed to the brake disc 10 and extends parallel to the rotation axis of the brake disc 10 is fitted into a pin hole 11 provided in the bracket 2, and
Further, a U-shaped notch 13 is formed at the other end of the brake caliper 4, the bottom of which is approximately oriented toward the sliding pin 9;
3, the sliding pin 9 is fixed to the bracket 2.
A detent pin 14 extending parallel to the detent is fitted with a clearance, and the notch 13 on the outer periphery of the detent pin 14 is fitted.
A chevron wire spring 16 whose middle part straddles the part facing the bottom part
Since both ends of the brake caliper 4 are locked to both inner surfaces of the notch 13, the connection between the brake caliper 4 and the one sliding pin 9 is released, and the center connection between the sliding pin 9 and the rotation stopper pin 14 is performed. It can be easily removed from the bracket 2 by simply pulling it up along the line, and therefore, as in the conventional device, one of the two sliding pins is centered in order to obtain a working space for replacing the pad. Compared to the case where the caliper was rotated as a brake caliper, a wider working space is easily secured, and the entire caliper 4 can be separated from the bracket 2 extremely easily by removing just one sliding pin 9 from the brake caliper 4. Therefore, pad replacement work can be done quickly and easily.

In particular, when the angle-shaped wire spring 16 has both ends locked with the inner surfaces of both sides of the notch 13 or its middle portion straddles the portion of the outer periphery of the anti-rotation bottle 14 facing the bottom of the notch 13, the notch 13 rotates. By simply moving the brake caliper 4 into engagement with the stop pin 14, it can be easily and quickly assembled into a predetermined set position, thereby further increasing the efficiency of the caliper 4 separation operation and, therefore, the pad replacement operation.

In addition, even if there is a relatively large manufacturing error in the distance between the axes of the sliding pin 9 and the locking pin 14, it can be easily absorbed by the elastic deformation of the spring 16, and manufacturing is easy. Furthermore, the structure of the angle-shaped wire spring 16 itself is simple, and it is easier to manufacture than the conventional device in which an elastic bushing is interposed between a sliding pin and its pin hole as an error absorbing means.

Moreover, since the bottom of the U-shaped notch 13 at the other end of the brake caliper 4 is substantially oriented toward the sliding pin 9, as long as the sliding pin 9 and one end of the caliper 4 are connected, the locking pin 14 There is no risk that the locking member will come off from the notch 13, and in other words, the rotation stopper 14 can be used not only as a rotation prevention means for the caliper 4 but also as a prevention means for removing it from the bracket 2. No stopping means is required, the structure is simplified, and as a result, manufacturing costs can be significantly reduced.

Further, since the detent pin 14 is floatingly supported in the notch 13 at the other end of the caliper 4 via the chevron wire spring 16, even if the caliper 4 vibrates somewhat during running or braking, the pin 14 will not move inside the notch 13. Therefore, compared to a system in which the detent pin is directly pressed against the inner surface of the notch by spring force, it is more effective in reducing the noise generated by the disc brake device while driving and the braking noise. can be suppressed.

Moreover, since there is no need for special precision machining of the inner surface of the notch 13 as a sliding movement with respect to the detent pin 14, this can contribute to a reduction in manufacturing costs.

[Brief explanation of drawings]

Fig. 1 is a side view of one embodiment of the device of the present invention, Fig. 2 is a plan view of the same, Fig. 3 is a sectional view taken along the line ■-■ of Fig. 1, and Fig. 4 is a
5 is a sectional view taken along the line V--V in FIG. 2. FIG. 1...Brake disc, 2...Bracket, 3゜3'...Friction pad, 4...Brake caliper, 5
゜5'... Arm part, 7... Operating piston as a pressing mechanism, 9... Sliding pin, 11... Pin hole, 13...
・Notch, 14... Detent pin, 16... Spring, F
...Front fork as part of the vehicle body.

Claims (1)

[Claims] 1 A bracket 2 fixed to the vehicle body adjacent to the brake disc 1 that rotates together with the wheel, and the brake disc 1
0 has a pair of arm parts 5, 5' that straddle a pair of friction pads 3, 3' arranged on both sides, and one of the arm parts 5 is provided with a pressing mechanism capable of pressing the back surface of one of the friction pads 3. A sliding pin 9, which is detachably fixed to the side surface of one end of the brake caliper 4 and extends parallel to the rotational axis of the brake disc 1, is fitted into a pin hole 11 provided in the bracket 2. A U-shaped notch 13 is formed at the other end of the brake caliper 4, the bottom of which is substantially oriented toward the sliding pin 9, and within this notch 13, the sliding pin is fixed to the bracket 2. A detent pin 14 extending parallel to the movable pin 9 is fitted with a clearance, and the detent pin 1
Both ends of a chevron-shaped wire spring 16 whose intermediate portion straddles a portion of the outer periphery of 4 facing the bottom of the notch 13 are engaged with both inner surfaces of the notch 13, and the brake key W
A disc brake device for a vehicle in which the other end of a liper 4 is floatingly supported on a rotation stopper pin 14.