JPS5825893B2 - disc brake - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention generally relates to a disc brake that is particularly effective as a disc brake for two-wheeled vehicles. a leading arm and a trailing arm that are opposed to each other at a distance, and whose lower ends are connected to each other, and an opening is formed within a gap between the two arms to receive a piston-side friction pad that engages with one side of the disk; The distance from the fixed part of the vehicle is such that the distance at the hole 1 provided in the trailing arm is larger than the dead weight distance provided in the leading arm when the disc rotates normally. a support fixed to the support; and a piston-side friction pad disposed axially straddling the support and holding a caliper housing-side friction pad that engages with the other surface of the disk and that engages with one surface of the disk. a caliper housing comprising a piston and cylinder device that generates a pressing force in the direction of the disk, and having a pair of holes that align with holes provided at the tips of both arms of the support; a pair of slide pins extending through the bore and spaced apart enough to slide within the bore of the support to hold them in a predetermined relationship and bias the caliper housing relative to the support during braking; In the brake, a hole provided in the trailing side arm has a gap in the circumferential direction of the disk and in a direction generally orthogonal thereto between the hole provided in the trailing arm and the slide pin passing through the hole, so that the friction pad on the piston side The caliper contacts the friction pad on the caliper housing side when applying a braking force of magnitude F to the trailing arm at a braking point that is a vertical distance H away from the line of action connecting the pair of slide pins in the direction of the lower end of the arm. A large Fx (H/
L) generates a force couple in a direction that resists the brake torque of magnitude HxF generated by the piston-side pad that pivots with the force of force L) and acts on the trailing arm toward its lower end; The present invention relates to a disc brake characterized by canceling out part of the torque.

Usually, a disc brake for a two-wheeled vehicle, especially a front wheel, is attached to a boss provided on a front fork, so the attachment hole for the boss of the support, which is a fixing element of the brake, is not symmetrical with respect to both arms of the support.

For example, as shown in Fig. 2, in a disc brake in which the disc leading arm is fixed to the vehicle body when the left arm, that is, the disc, rotates normally (in the direction of the arrow), during braking operation,
The moment generated by the brake pad is smaller in the right arm, i.e. the disc trailing arm, and in the left arm.

Conventionally, therefore, it has been common practice to strengthen the arm that receives a large moment by increasing its thickness and shape.

However, this method was not the best solution as it increased the weight of the brake itself and required extra material.

In order to improve the drawbacks of the conventional method, the present invention provides a clearance in a specific direction between the hole provided in the arm that is not directly supported by the vehicle, that is, the trailing arm, and the slide pin that passes through the hole. The brake pad is configured to transmit at least half or more of the braking force moment generated by the brake pad to the arm directly supported by the vehicle, that is, the leading arm, thereby increasing the thickness of the non-supporting arm.
This eliminates the problem of uneven load without increasing the weight of the brake itself by reinforcing its arms by providing ribs, and without requiring extra materials.

Examples will be described below.

The figure shows the novel disc brake of the invention.

When the driver operates the brakes, caliper housing 1
Pressure oil is supplied from a predetermined pressure oil source (not shown) into a cylinder 3 provided in the caliper housing 1 through a pressure oil supply hole 2 provided in the caliper housing 1 .

The piston 4 housed in the cylinder 3 moves in the direction of an arrow 5 toward a disk (not shown) by the pressure oil.

On the other hand, the caliper cylinder 1 is fixed to the front fork of the vehicle body by a known method in a mounting hole 6, indicated by a chain line, by the reaction force of the piston 4 caused by the pressure oil.
Holes 9, 9 are provided in the thickened tips 8°8 in the axial direction of the arms extending left and right of the letter-shaped support 7, that is, the leading arm 21 and the trailing arm 22 of the disc during normal rotation of the disc. The caliper housing as a whole moves in the direction opposite to the arrow 5 with respect to the support 7 by being slidably guided by slide pins 12, 12 passing through the caliper housing 1 and having both ends aligned with the alignment holes 10-11 and 10-11 of the caliper housing 1.

In this way, the disk has one side with a pad 13 that is directly compressed by the piston 4 and the other side with a pad 14 that opposes it.
Pressed by

Pad 13 connects pins 12 and 12 in holes 9 and 9 of support 7.
The caliper moves while being guided by the pin 1 whose both ends are bridged and supported by the upper lips 15 and 16 of the cylinder 1.
It is suspended at 7°17.

The pad 14 is also held by suitable means to the caliper housing 1 and suspended like the pad 13 from the pins 17,17.

However, in the disc brake of the present invention, the pad 13 is slidably fitted between the arms 21, 22 of the support 7, and when the piston 4 moves in the direction of the arrow 5, the pad 13 is slidably guided between the arms. while touching the disc.

Further, as clearly shown in FIG. 2, in the disc brake of the present invention, the hole 9 provided at the tip 8 of the left arm 21 is slidably and tightly fitted into the slide pin 12 passing through the hole 9. On the other hand, the hole 9 of the right arm 22 has a gap 25 extending in the circumferential direction of the disk and in a direction approximately perpendicular thereto with respect to the slide pin 12 passing through it. It fits loosely.

Therefore, if the disk is rotating normally in the direction of the arrow 23, the braking force of the piston-side pad 13 will be applied to the right arm 2 of the support 7 during braking.
It appears as shown by an arrow 24 toward the left side surface of 2.

However, the braking force transmitted to the arm 22 is directly transferred to the support 7.
is transmitted from the vehicle to the vehicle.

On the other hand, the braking force of the pad 14, which moves in the axial direction together with the caliper housing 1 and contacts the disc from the side opposite to the pad 13, is similarly directed in the direction of the arrow 24, but since the caliper pad 14 moves together with the housing 1, The braking force of the pad 14 in the direction of the arrow 24 exhibits the same effect when the caliper housing 1 is moved in the direction of the arrow 24.

The caliper housing 1 has left and right slide pins 12.1.
2 is fixed, the force of said pad 14 in the direction of arrow 24 is replaced by a force that directs pin 12.12 to the right.

Here pin 12°12 and support 7 or arm 21.2
Looking at the relationship between the holes 9 and 9 provided in 2, as mentioned above, although they fit tightly in the hole in the left arm, they fit loosely in the hole in the right arm 25.

The force which directs said pin 12 . 12 to the right is therefore transmitted to the support 7 only via the left pin 12 and the arm 21 .

That is, in this disc brake, 1/2 of the total braking force is applied to each separate arm 21, 22.

The advantages of the present invention become more apparent when compared with known disc brakes.

In a known disc brake in which a hole provided in the arm and a slide pin passing through the hole are tightly fitted on both the left and right sides, for example, when the disc is rotating in the direction of arrow 23, the braking force of the piston-side pad 13 is naturally applied to the right side. added to arm 22.

The braking force of the first arm side butt 14 is applied almost equally to the arm 2L22 via the pin 12.12.

In other words, a total braking force of 75 yen is applied to the right arm 22,
25% will be added to the left arm 21.

This is the reason why, in the conventional device, it was necessary to increase the thickness of the right arm, that is, the arm that receives a large force, or to provide a reinforcing rib.

The present invention will be explained in more detail with reference to FIG.
Friction pad 13 on the piston side and caliper housing side
．． When the braking force of 14 is F, the piston side pad 130 fitted between both arms 2122 of support 7
The braking force F is 1 and all of it is directed directly to the trailing arm 22 at a braking point that is separated by a vertical distance H toward the lower end of the arm from the line of action connecting the pair of pins 12 and 12, as indicated by an arrow 24. It is thought that it can be added as follows.

On the other hand, the braking force F of the housing side pad 140 that is locked to the caliper housing is due to the gap 25 between the hole 9 provided in the trailing side arm 22 and the pin 12 passing through it. 14 braking force F is not transmitted to the trailing arm 22, but is entirely transmitted to the leading arm 21 via the pin 12 fitted into the leading arm 21.

However, as mentioned above, the braking force F of the caliper pad 14 originally acts on the caliper Ujifugu 1 itself in the same direction and position as shown by the arrow 24 in FIG. Although the pin 12 of the caliper housing 1 is tightly fitted into the hole 9 of the rear arm 22
Since the other pin 12 is loosely fitted into the hole 9, the braking force F of the caliper side pad 140 is
It appears as a counterclockwise torque of magnitude FXH centered on the pin 12 that fits into the hole 9 provided at the tip of the leading arm 21 without applying any force to it.

The braking torque of this caliper side pad 14 is caused by the pin 12, which has a distance between the slide pins 12 and 12 and is loosely fitted into the hole 9 at the tip of the trailing side arm 22, moving the arm 22 in the opposite direction to the lower end of the arm connection. That is, when the upward pushing force is F'j, the caliper housing 1 is moved counterclockwise with a force of LXF' centering on the pin that fits into the hole provided in the preceding arm 21. The aim is to pivot to

Here, FXHH F'XL , ', F' = -XF and this size F
') can be considered to be applied to the hole 9 of the trailing arm 22.

Generally, in this type of disc brake, the force applied to the right arm 22 is small because -<<1>.

Furthermore, the force (FX-) has the effect of rotating the right arm 22 counterclockwise, and the braking force from the piston side pad 13 directly applied to the right arm, that is, the braking force of the arm 22, is transferred to the lower mounting pin 6. This cancels out a part of the force of rotation in the clockwise direction, and as a result, the force applied to the right arm 22 is greatly reduced.

This eliminates the need to reinforce the right arm 22 as in known disc brakes.

In the present invention, the pads 13.14 are simply suspended from the openings 18 provided in the upper part of the caliper housing 1 to both sides of the desk by the pins 17.17, so if the pins 17.17 are pulled out as necessary, the pads 13 and 14 can be easily pulled out from the opening 18, so that they can be replaced very easily.

The effectiveness of the present invention is further increased in a type of disc brake in which the braking force of both pads is directly transmitted to the caliper housing as shown in FIG.

That is, in the disc brake shown in FIG.
3.14 are both the ribs 15 and 16 of the caliper housing 1
It is arranged in contact with wall portions 19 and 20 that constitute the axial walls of the opening 18 provided therebetween.

Therefore, in Fig. 3, the right slide pin 12 is supported by γ
If the left slide pin 12 is loosely fitted into the hole 9 and the left slide pin 12 is tightly fitted into the hole 9, and the disc is rotating to the right, then during braking, all the braking force of the pads 13 and 14 will be applied to the left side. The braking force is transmitted to the arm 21 via the pin 12 of the brake, so that almost no braking load is generated on the right arm 22.

Therefore, in this case, the effect of the present invention is extremely significant.

In this way, the present invention provides a slide pin that is slidably and tightly fitted into the hole provided in the arm on the side that is fixed to the vehicle body frame, and a slide pin that passes through the hole provided in the arm on the other side. By loosely fitting the pin, the braking force exerted on both arms is balanced, and an economical and lightweight disc brake with well-balanced strength is provided.

[Brief explanation of the drawing]

Fig. 1 is a partially broken top view of a disc brake embodying the present invention, Fig. 2 is a side view taken along the line 2
FIG. 2 is a partially cutaway top view showing an example. Explanation of symbols 1: Caliper housing, 7: Support,
9: Hole, 12 Ni slide pin, 13° 14: Pad, 2
1.22: Arm, 25: Play space.

Claims (1)

[Scope of Claims] 1. It has a leading arm and a trailing arm that have a hole at their tip, are opposed to each other at a predetermined interval in the circumferential direction of the disk, and have their lower ends connected to each other, with An opening is formed to receive the piston-side friction pad that engages with one side of the disc, and the distance from the fixed part of the vehicle is greater than the distance at hole 1 provided in the leading arm when the disc rotates normally. , a support provided on the trailing arm that is fixed to the vehicle fixed part so that the dead weight distance is larger than that of the support, and a support provided straddling the support in the axial direction and engaged with the other surface of the disk. a piston and cylinder device that holds a friction butt on the caliper housing side to which the caliper housing fits and generates a pressing force in the direction of the disk on a friction pad on the piston side that engages one side of the disk, and is provided at the tips of both arms of the support. a caliper housing having a pair of apertures aligned with the apertures in the support and the caliper housing; A pair of slide pins that slide within the holes; In a disc brake, the hole provided in the trailing arm has a hole formed in the trailing arm that extends in the circumferential direction of the disk and in a direction generally perpendicular thereto between the hole and the slide pin passing through the hole. There is a gap, whereby the piston-side friction pad applies a predetermined amount of braking force to the trailing arm at a braking point that is a predetermined distance away from the line connecting the pair of slide pins toward the lower end of the arm. When the brake is applied, the caliper engages the lower end of the arm in a direction approximately perpendicular to the circumferential direction of the disc around the slide pin that engages with a hole provided in the leading arm as the caliper engages the friction pad on the caliper housing side with the disc. generating a couple in a direction that opposes the brake torque generated by the piston-side friction pad that moves in a direction away from the rear arm and acts on the trailing side arm toward its lower end; Disc brakes characterized by offsetting.