JPH0118909Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a disc brake using a link mechanism.

An example of a conventional disc brake of this type is shown in FIG. The brake levers 1 and 2 each have an inward protrusion 1 with a pin hole.
Both arms 5 of the bracket 5 are attached to the vehicle body 3 with fixing bolts 4, 4, respectively, and have the brackets 5a and 2a in the middle part.
The protrusions 1a and 2a are inserted between the protrusions 1a and 5a in an overlapping manner, and a link pin 6 is inserted through the protrusions 1a and 5a so that they are pivoted and are rotatable around the pin 6. Outer brake pads 7 and inner brake pads 8 are attached to the tips of both brake levers 1 and 2 by screwing presser bolts 9 and 10 into their back metals 7a and 8a, respectively, and the same are attached to the base ends of the brake levers 1 and 2. long operating link 11,
12, 13, and 14 are rotatably connected by pins 15, 16, respectively. Actuation links 11, 12,
13 and 14 form a parallelogram, and connect the operating links 11 and 12 with the connecting pin 17.
3 and 14 are connected to each other by a connecting pin 18, an inner cable 19a of the operation cable 19 is connected to the connecting pin 17, and an outer cable 19b is connected to the connecting pin 18. By operating the brake pedal (not shown), the inner cable 19
When the connecting pin 17 is pulled upward in the figure at a, and the connecting pin 18 is pushed downward in the figure by the outer cable 19b as a reaction force, the operating link 1
1, 12, 13, and 14, the tips of the brake levers 1 and 2, whose intermediate portions are pivoted to the bracket 5 with the link pins 6, By reducing the distance between the pads 7 and 8, the disc 20 rotating together with the wheel is compressed to generate braking force. If you release the braking force,
Brake levers 1 and 2 have return springs 23
It returns to its original position by the action of .

For conventional disc brakes of this type,
In general, both brake pads are attached to the brake lever by screwing retainer bolts into the back metals of both brake pads, respectively, so when inspecting or replacing brake pads, the inner brake pads are particularly susceptible to interference from the vehicle body. There were problems with the installation and removal work.

The present invention has been developed in view of the above-mentioned conventional problems, and involves fixing each end of a connecting member made of an elastic material to an inner brake pad and an outer brake pad. Connecting both pads at the same time, fixing only one brake pad to the corresponding one brake lever, and forming an engaging portion on the tip of the other brake lever or on the vehicle body to receive the braking torque of the other brake pad. The purpose of the present invention is to solve the above-mentioned problems by adopting a structure in which a pair of brake pads are supported by a pair of brake levers.

Hereinafter, with reference to the illustrated embodiments of the present invention,
The same parts as in the prior art will be described with the same reference numerals.

2 and 3 show a disc brake to which the present invention is applied. The brake levers 1 and 2 have an inward protrusion 1a having a U-shaped cross section and a pin hole.
Both arms 5 of a bracket 5 are formed at the intermediate portions 2a and attached to the vehicle body 3 with fixing bolts 4, 4.
The protrusions 1a and 2a are superimposed on the outer sides of the protrusions 1a and 5a, and a link pin 6 is inserted through the link pin 6 to be pivotally attached, and the link pin 6 is rotatable around the pin 6. A pair of operating links 11, 12 of the same length are rotatably connected to the base ends of both brake levers 1, 2 by pins 15, 16, respectively, and the inner ends of the operating links 11, 12 are angled. They are crossed and connected by connecting pins 17. In addition, the bracket 5 attached to the vehicle body 3 has
The wheel cylinder 24 is integrally formed, and the tip of the piston rod 25 is connected to the connecting pin 17 to constitute the input part of the service brake, and the outer end of one operating link 12 is extended to connect the parking cable 26. A connecting actuation link 27 is formed to constitute the input part of the parking brake.

Next, a structure for attaching both brake pads 7 and 8 to the brake levers 1 and 2 will be explained.

As shown in FIGS. 4 and 5, both brake pads 7 and 8 are made by welding each end of a connecting member 28 made of an elastic body (for example, a leaf spring) to the back metals 7a and 8a by welding, screwing, etc. By fixing each
A brake pad assembly is formed in which the friction materials 7b and 8b are opposed and connected by a connecting member 28. In such a brake pad assembly, screw holes 7c, 7c are formed only on the side far from the vehicle body 3, that is, on the back metal 7a of the outer brake pad 7, and only the outer brake pad 7 is attached to the brake lever 1 with the presser bolts 9, 9. is combined with On the other hand, a protruding engagement part 2b is connected to the tip of the brake lever 2 on the side of the vehicle body 3 so as to receive braking torque, so as to cover at least the side edge of the back metal 8a of the inner brake pad and its corner. It is provided so as to avoid the member 28 (see FIG. 6). Further, a torque receiving member 29 serving as an engaging portion receiving braking torque is attached to the vehicle body 3 as shown in FIG.
Protrude more and insert the back metal 8 of the inner brake pad.
As shown in FIG. 7, the engaging portion that supports both side edges of the brake pad or receives the braking torque is a pin 34 that protrudes from the brake lever 2, and the pin 34 is engaged with the back metal 8a of the inner brake pad. It can be inserted into the hole 8c. These engaging portions that receive braking torque may be employed singly or in combination depending on the mounting state of the brake and the like.

In such a disc brake, if the outer ends of the operating links 11 and 12, that is, the base ends of the brake levers 1 and 2, are expanded through the wheel cylinder 24 or the operating link 27 by operating a brake pedal or brake lever (not shown). The tips of the brake levers 1 and 2, whose intermediate portions are pivotally attached to the bracket 5 by means of a mounting pin 6, reduce the distance between them and pinch the rotating disk 20 between the brake pads 7 and 8 to generate braking force. . At this time, the braking torque generated in the inner brake pad 8 is supported by the protruding edge 2b of the brake lever 2, which is an engaging portion, the braking torque receiving member 29, or the pin 34.

When the brake is released, both brake levers 1 and 2 return to their original positions by the action of return springs 30 and 31. And inner brake pad 8
Since the clearance between the brake pad 8 and the disk 20 is secured by receiving the elastic force of the connecting member 28, the brake pad does not drag.

Both brake pads 7 and 8 are damaged due to use of the brakes.
To replace both brake pads 7 and 8 when they are worn out, unscrew the adjustment bolts 32 and 33 and secure sufficient clearance between both brake pads 7 and 8 and the disc 20, then replace the outer brake pads. The brake pad assembly can be replaced by removing the holding bolt 9 of 7.

As explained above, the present invention includes a pair of operating links connected by a connecting pin at an intersecting angle,
a pair of brake levers that are pin-coupled to both ends of the pair of operating links, a bracket that is fixed to the vehicle body and pivots the middle portions of the pair of brake levers, and a bracket that is attached to the tips of the pair of brake levers. In a disc brake having an inner brake pad and an outer brake pad that pinch a disc that rotates with the wheel, each end of a connecting member formed of an elastic body is attached to the inner brake pad and the outer brake pad, respectively. and connect both pads with the connecting member,
Only one brake pad is bolted to the corresponding one brake lever, and an engaging portion that receives the braking torque of the other brake pad is formed on the tip of the other brake lever or on the vehicle body, and The structure supports a pair of brake pads. Therefore, the work of installing and removing brake pads can be done by simply unfastening the bolt of one brake pad to the brake lever, and both pads can be assembled as one body. This has the effect of significantly improving work efficiency.

[Brief explanation of the drawing]

Fig. 1 is a front view of a disc brake using a conventional link mechanism, Fig. 2 is a front view of a disc brake to which the present invention is applied, Fig. 3 is a side view of the same, and Fig. 4 is a front view of a disc brake using a conventional link mechanism.
The figure is a side view of the pad assembly, Figure 5 is a front view of the same,
FIG. 6 is a side view showing the tip of the brake lever on the vehicle body side, and FIG. 7 is a front view showing another example of the structure of the tip of the brake lever. 1, 2... Brake lever, 2b... Edge (engaging part), 3... Vehicle body, 5... Bracket, 7...
Outer brake pad, 7a... Back metal, 8...
Inner brake pad, 8a... Back metal, 9...
Holder bolt (bolt), 11, 12... Operating link, 15, 16... Pin, 17... Connection pin, 2
0... Disc, 28... Connection member, 29... Braking torque receiving member (engaging portion), 34... Pin (engaging portion).

Claims (1)

[Scope of utility model registration request] A pair of actuation links connected by connecting pins at an intersecting angle, a pair of brake levers each pin-coupled to both ends of the pair of actuation links, and a brake lever fixed to the vehicle body with an intermediate portion of the pair of brake levers as an axis. In the disc brake, the disc brake has a bracket that is attached to the brake lever, and an inner brake pad and an outer brake pad that are attached to the tips of the pair of brake levers and pinch a disc that rotates together with the wheels. Each end of a connecting member formed of an elastic body is fixed to the pad, and both pads are connected by the connecting member, and only one brake pad is bolted to the corresponding brake lever, and the other brake pad is bolted to the corresponding brake lever. A disc brake, characterized in that an engaging part that receives the braking torque is formed on the tip of the other brake lever or on the vehicle body, and the pair of brake pads are supported by the pair of brake levers.