JP3621158B2 - Brake pad support mechanism for disc brake - Google Patents

Description

[0001]
[Industrial application fields]
TECHNICAL FIELD The present invention relates to a brake pad support mechanism for a disc brake of an open top type caliper, and relates to a brake pad support mechanism for fixing a brake pad by suspending the brake pad by a support pin and pressing the brake pad radially inward by a presser spring. The presser spring can also be used as a retaining means for the support pin to simplify the mechanism and structure, reduce the weight, and reduce the manufacturing cost.
[0002]
[Prior art]
In a so-called open-top caliper disc brake, the braking torque applied to the brake pad during braking operation is supported by the support, but in order to stably support the brake pad on the caliper, the brake pad is supported by a pair of left and right support pins. It is attached to the caliper while being pushed inward in the radial direction by a suspension and presser spring.
An outline of this conventional brake pad support mechanism (for example, Japanese Utility Model Publication No. 5-36096) will be described with reference to FIG. 4 which is a plan view thereof.
The caliper 1 is inserted into the caliper body 1A through the caliper 1 and the brake pads 2 and 3 are inserted into the caliper body 1A and the brake pad holes. The C-shaped portions at both ends of the spring wire 6 are engaged with the annular grooves at the tips of the support pins 5 and 5 to prevent the support pins 5 and 5 from coming off. As a result, the inner and outer brake pads 2 and 3 are suspended by the support pins 5 and 5. The brake pad is taken out from the opening of the caliper 1 by removing the C-shaped portions at both ends of the spring wire 6 from the annular grooves at the tips of the support pins 5 and 5 and extracting the support pins.
The left and right tongue pieces 7a and 7b of the cross-shaped presser leaf spring 7 are inserted under the left and right support pins 5 and 5, and the inner and outer tongue pieces 7c and 7d are inserted into the inner and outer brake pads 2, 3 (specifically, the blur pad). The brake pads 2 and 3 are elastically pressed inward in the radial direction of the brake disc by the spring force of the presser leaf spring 7. Thereby, the inner and outer brake pads are stably attached to the caliper.
The inner and outer pads 2 and 3 are pressurized by the inner and outer pistons 8 and 8 provided facing each other, and are brought into pressure contact with the brake disk (rotor) D to be braked.
By the way, the above-mentioned conventional brake pad support mechanism uses support pins with left and right heads, so the manufacturing cost is higher than the simple rod-like pins without heads, as much as the heads are attached. The weight is large. Although the size of the weight is small, it is a problem that cannot be neglected in reducing the weight of the brake device as much as possible. In addition, since the support pin is prevented from coming off by using the spring wire 6 dedicated to retaining, and the presser plate spring 7 dedicated to holding the brake pad is used, the production cost can be reduced as much as possible. There is still room for consideration from the viewpoint of reducing weight.
[0003]
[Problems to be solved by the invention]
The present invention reduces the manufacturing cost as much as possible by reducing the weight of the brake pad support mechanism of the conventional open top caliper in which the brake pad is supported by the caliper by the left and right support pins and the presser spring. For this purpose, it is an object of the present invention to devise a brake pad support mechanism comprising a support pin and a presser spring so that the structure of the support pin is simplified and the retaining means and the brake pad presser spring can be used in combination. Is.
[0004]
[Means for Solving the Problems]
Means taken in order to solve the above-described problems is constituted by the following elements (a) to (c).
(B) The support pin is a rod-shaped pin without a head,
(B) U-shaped bent portions are provided at both left and right ends of the spring wire, and the left and right radial outer ends of the outer pad are sandwiched by the U-shaped bent portions. Inserted into the holes provided in the left and right support pins between the inner surface of the claw part and the outer pad, and locked both ends of the spring wire to the ends of the left and right support pins,
(C) A part of the U-shaped bent portion of the spring wire locked to the ends of the left and right support pins is folded below the support pin and brought into contact with the lower surface of the support pin. The intermediate portion is bent outward to form a pad presser, and the pad presser is pressed against the radially outer end of the outer pad.
[0005]
[Operation]
U-shaped bent parts are provided at the left and right ends of the outer spring wire, and the left and right radial outer ends of the outer pad are sandwiched by the U-shaped bent parts. Since it is inserted into the hole provided in the left and right support pins between the inner surface of the part and the outer pad, if the support pin tries to come out from the outside to the inside, the U-shaped bends at the left and right ends of the spring wire The portion hits the outer surface of the outer pad. Therefore, the support pin is prevented from slipping out from the inside to the inside (prevention of the support pin by the head of the prior art) by the left and right ends of the spring wire. Further, when the support pin is pulled out from the inside to the outside, a part of the U-shaped bent portion of the spring wire is caught on the inner surface of the caliper claw portion. Therefore, the supporting pin is prevented from slipping out from the inside to the outside (preventing slipping by the spring wire 6 in the prior art) by a part of the U-shaped bent portion of the spring wire.
In addition, a part of the U-shaped bent portion of the spring wire locked to the ends of the left and right support pins is folded below the support pin and brought into contact with the lower surface of the support pin. The outer wire is bent outward and pressed against the radially outer end surface of the outer pad, so the left and right ends of the spring wire are pressed downward by the left and right support pins, and the outer pad is pressed by the spring force of the spring wire. The radially outer surface of is pressed inward in the radial direction. That is, the intermediate portion of the spring wire material performs the function of the outer tongue piece 7d of the presser leaf spring 7 of the prior art.
As described above, the spring-shaped rod-shaped support pin without a head is prevented from slipping out from the inside to the outside, and from the outside to the inside. Can be elastically pressed inward in the radial direction. And since a support pin can be manufactured by cut | disconnecting a bar and providing a hole in the outer part, manufacture of a support pin can be made easy and easy, and the processing cost can be reduced. Further, the support pin is reduced in weight by the amount without the head.
In addition, since the spring pad is used to prevent the outer pad from being pressed and the outer pad is pressed by the spring wire, a special cross-shaped presser plate spring is used, and a spring wire dedicated to the retaining is used. The manufacturing costs of the springs can be reduced and the total weight of these springs can be reduced.
[0006]
Embodiment
The left and right ends of the “other spring wire” as means for solving the above-mentioned problems are brought into contact with the lower surfaces of the left and right support pins, and the intermediate portion of the spring wire is bent inward to form an inner pad presser. The presser part is pressed against the radially outer edge of the inner pad.
[0007]
[Operation]
The above-mentioned “other spring wire”, in other words, the left and right ends of the inner spring wire are brought into contact with the lower surfaces of the left and right support pins, and the intermediate portion of the spring wire is bent inward to form a pad presser. The back metal 2A is pressed against the outer end in the radial direction. As a result, the left and right ends of the other spring wire are pressed downward by the left and right support pins, and the radially outer end of the inner pad 2 is pressed radially inward by the spring force of the spring wire. That is, the intermediate portion of the spring wire material performs the function of the inner tongue piece 7c of the presser leaf spring 7 of the prior art. And since the function of this other spring wire is simple, the said spring wire may be a thing of a simple shape.
[0008]
【Example】
Next, an embodiment will be described with reference to FIGS. 1, 2, and 3.
Since this embodiment is an open top type but not an opposed type, one piston 8 is provided inside. The caliper 1 is slidably supported in the axial direction (the axial direction of the brake disc) by the left and right guide pins 10 and 10 for caliper support.
The left and right support pins 20 that support the pads are rod-shaped support pins in which a bar is cut and a vertical through hole 20a is provided at the outer end. The support pin 20 is inserted into the hole of the caliper body 1A, the hole of the caliper claw portion 1B, the hole of the back metal 2A of the inner pad 2, and the hole of the back metal 3A of the outer pad 3. The outer pad 3 is suspended.
U-shaped bent portions 30b are provided at both left and right ends of the spring wire (outer spring wire) 30, and the left and right radial outer ends of the back metal 3A of the outer pad 3 are sandwiched by the U-shaped bent portions 30b. The left and right ends 30a of the spring wire 30 are inserted into the through holes 20a provided in the left and right support pins 20 between the inner surface 1f of the caliper claw portion 1B and the back pad 3A of the outer pad, Both ends of 30 are locked to the outer ends of the left and right support pins.
A part of the U-shaped bent portion 30b of the spring wire 30 locked to the outer ends of the left and right support pins 20 is further folded back into a U shape to form a support portion 30c. Folded downward and brought into contact with the lower surface of the support pin 20, and further, the intermediate portion of the spring wire 30 is bent outward to form a presser portion 30d, and the presser portion 30d is pressed against the radially outer end of the back pad 3A of the outer pad. I am letting.
Also, the left and right ends 40a of the other spring wire (inner spring wire) 40 are brought into contact with the lower surfaces of the left and right support pins 20, and an intermediate portion of the spring wire 40 is bent inward to form a holding portion 40d. 40 d is brought into pressure contact with the radially outer end of the back metal 2 </ b> A of the inner pad 2.
Since both the left and right ends of the spring wires 30 and 40 are supported by the left and right support pins, the inner pads 2 and the outer pads 3 are radially inward by the holding portions 30d and 40d, respectively. Can be pressed elastically.
When the support pin 20 tries to come out from the outside to the inside, a part of the U-shaped bent portion 30b of the spring wire 30 is caught on the outside surface 3f of the outside pad 3, so that the outside pin 3 is prevented from coming off from the outside. Further, when the support pin 20 tries to come out from the inside to the outside, a part of the U-shaped bent portion 30b of the spring wire 30 is caught on the inner surface 1f of the caliper claw portion 1B, and this prevents the inside from coming out from the inside. Made. Therefore, the support pin is prevented from coming off in both the inner and outer directions.
[0009]
[Effect]
The invention that has solved the above-mentioned problems of the present invention is not yet known. Therefore, the above-mentioned problem in the prior art is solved by solving the above-mentioned new problem, that is, the support pin for the pad can be made a simple bar-like support pin, and the structure of one spring wire is obtained. It has been devised that it can be used as both a retaining spring wire and a pad presser spring, reducing the manufacturing cost compared to the conventional one, and further reducing the weight. This is an effect unique to the invention (for details, see the description in the section of [Action]).
[Brief description of the drawings]
FIG. 1 is a plan view of an embodiment.
FIG. 2 is a front view of FIG. 1;
FIG. 3 is a perspective view of a spring wire 30. FIG.
FIG. 4 is a plan view of the prior art.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Caliper 1A ... Caliper body 1B ... Caliper claw part 1f ... Inner surface 2 of claw part ... Inner brake pad 2A ... Back metal 3 of inner brake pad ... Outer brake Pad 3A ... Back metal 3f of outer brake pad ... Outer surface 8 of outer brake pad ... Piston 10 ... Guide pin 20 ... Support pin 20a ... Vertical through hole 30 ... Outer side Spring wire 30a ... tip 30b of spring wire 30 ... U-shaped bent portion 30c ... support portion 30d ... pad retainer 40 of spring wire 30 ... inner spring wire 40a ... Tip 40d of spring wire 40 ... Pad retainer D of spring wire 40 ... Brake disc

Claims (2)

In the brake pad support mechanism of the open top type caliper in which the brake pad is supported by the caliper by the left and right support pins and the presser spring, the support pin is a rod-like pin without a head,
U-shaped bent portions are provided at both left and right ends of the spring wire, and the left and right radial outer ends of the outer pad are sandwiched by the U-shaped bent portions, and both left and right ends of the spring wire are connected to the caliper claw portions. Insert into the holes provided in the left and right support pins between the inner surface and the outer pad, and lock both ends of the spring wire to the ends of the left and right support pins,
A part of the U-shaped bent portion of the spring wire latched to the ends of the left and right support pins is folded below the support pin and brought into contact with the lower surface of the support pin. A brake pad support mechanism for a disc brake that is bent outward to form a pad presser, and the pad presser is pressed against the radially outer end of the outer pad. The intermediate portion of another spring wire is pressed against the radially outer end of the inner pad to the left and right support pins, and the left and right ends of the other spring wire are in contact with the lower surfaces of the left and right support pins. Brake pad support mechanism for disc brakes.

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