JPH0611367Y2 - Opposed disc brake - Google Patents

Description

[Detailed Description of Device] a. Purpose of the Invention (Field of Industrial Use) The present invention relates to an opposed type disc brake in which pistons are respectively arranged in an inner caliper and an outer caliper.

(Prior Art) Conventionally, as a disc brake type, a slide type disc brake in which a caliper is slidably attached to an anchor plate and an opposed type disc brake in which a caliper is fixedly attached to an anchor plate are well known. ing. As the opposed type disc brake, for example, there are those disclosed in Japanese Patent Publication No. 57-55550 and Japanese Patent Publication No. 62-6998.

This is one of the conventional opposed disc brakes.
An example is shown in FIG. The opposed disc brake 50 is arranged on the inner side in the axial direction of the wheel rim 3 and on the inner diameter side. In this figure, the left side is the inner side in the axial direction.
The disc brake 50 has an inner caliper 51 and an outer caliper 53 which are divided and formed on a surface A located substantially at the center in the axial direction. Both calipers 5
1, 53 are integrally connected by a bolt 57 and are fixed to an anchor plate (not shown). Further, the caliper 51, 53 is provided with a cylinder hole 51, respectively.
a and 53a are formed to face each other, and pistons 52 and 54 are slidably inserted into these cylinder holes 51a and 53a, respectively. The pistons 52, 54 face an inner pad 55 and an outer pad 56, which are arranged so as to sandwich the rotor 6, respectively.

Therefore, when the brake hydraulic pressure acts in the cylinder holes 51a and 53a, the pistons 52 and 54 are pushed out to press the linings of the inner and outer pads 55 and 56 against the inner side surface 6a and the outer side surface 6b of the rotor 6 to generate a braking force. Let

(Problems to be solved by the invention) In general, both pads 55 and 5 are used together with the use of a brake.
Since the lining of No. 6 is worn, it is necessary to replace it when the lining is worn to a predetermined limit. However, the wear of this lining should be minimized as much as possible.
It is desirable to maximize the life of the. In this case, if the outer diameter of the rotor 6 is increased to improve the heat dissipation of the rotor 6 and the temperature rise of the rotor 6 during braking is suppressed, the wear of the pads 55, 56 can be suppressed and the life thereof can be extended. Conceivable.

However, as shown in FIG. 5, since the brake 50 is disposed on the inner peripheral side of the wheel rim 3, the caliper 5
The outer diameters of 1, 53 are restricted by the wheel rim 3, it is difficult to increase the outer diameter, and the bolts 57 for connecting the inner and outer calipers 51, 53 are arranged. It is necessary to make the thickness so thick that the bolt 57 can be arranged. As a result, there is a problem that the outer diameter of the rotor 6 cannot be increased so much.

The present invention has been made in view of such a problem, and provides an opposed disc brake having a structure in which the outer diameter of the rotor can be increased by reducing the thickness of the caliper at the portion where the outer diameter of the rotor is opposed. The purpose is to

B. Configuration of the Invention (Means for Solving the Problems) In order to achieve such an object, in the present invention, in the outer caliper and the inner caliper that are integrally coupled and fixed to an anchor plate, the coupling surface of the outer caliper and the inner caliper is the inner surface of the rotor. The caliper is located more axially inward, and the connecting bolt inserted from the inner caliper side is screwed into the female screw of the outer caliper to connect both calipers. The thick-walled portion formed on the caliper is also positioned axially inward of the inner surface of the rotor to form an opposed disc brake.

(Operation) In the case of the opposed disc brake having such a configuration,
Since the connecting surface is inside the inner surface of the rotor, the bolts of both calipers are connected inside the inner surface of the rotor. In particular, in the present invention, not only the coupling surface but also the thick portion for the female screw formed on the outer caliper is formed axially inward from the inner surface of the rotor, so that the thick portion is Does not face the outer diameter part of. Therefore, the wall thickness of the portion where the outer diameter portion of the rotor faces may be thin as long as the strength can be secured, and the outer diameter of the rotor can be correspondingly increased.

(Embodiment) Hereinafter, a preferred embodiment of the present invention will be described with reference to the drawings.

An opposed disc brake BR to which the present invention is applied is shown in FIGS. 1 and 2. This disc brake BR
Has an inner caliper 10 and an outer caliper 20, and both calipers 10, 20 are integrally connected by a total of six connecting bolts 18 on each of the left and right sides. It is fixed to the anchor plate 1 at the leg portion 10 a of the inner caliper 10 by the bolt 9.

As shown in FIG. 3 which is a cross-sectional view taken along the arrow III-III, the opposed disc brake BR has a wheel rim 3
Is arranged inside. Inside the inner caliper 10 and the outer caliper 20, a pair of cylinder holes 11 and 21 are formed so as to face each other, and the pistons 12 and 22 are slidably fitted into the cylinder holes 11 and 21, respectively. Has been done.

An inner pad 15 and an outer pad 25 are arranged so as to face the open end portions of the pistons 12 and 22,
The rotor 6 is arranged at a position sandwiched by the pads 15 and 25. The rotor 6 is fitted to the wheel hub 2 and rotates integrally with the wheel. The inner pad 15 and the outer pad 25 are respectively composed of back plates 17 and 27 and linings 16 and 26 joined to the back plates 17 and 27, and the back plates 17 and 27 are provided at the open ends of the pistons 12 and 22, respectively. The linings 16 and 26 face each other and face the inner surface 6 a and the outer surface 6 b of the rotor 6.

On the other hand, as can be seen clearly from FIG. 2 and FIG. 4 (cross-sectional views taken along arrows IV-IV), the outer caliper 20 has a pair of left and right arm portions 20a extending toward the inner caliper 10 (inward in the axial direction). 20a, and the tip surfaces B of the arm portions 20a abut on the side surface of the inner caliper 10, and the connection is made by the connection bolts 18 at this portion. That is, the surface B is the connecting surface of the calipers 10 and 20, and as can be seen from these figures, the connecting surface B is located inward in the axial direction in the opposed disc brake BR.

Left and right arm portions 20a, 2 of the outer caliper 20
A space 19 (see FIG. 3) is formed between 0a, and the inner and outer pads 15 and 25 are inserted into the space 19 from the outer diameter side. Here, both calipers 10, 2
Protrusions (not shown) protruding toward the other side are formed on the inner diameter side of 0, respectively, and the inner diameter side end portions of the back plates 17, 27 of the pads 15, 25 inserted as described above contact the protrusions. Both pads 15 and 25 are located in contact with each other at the positions shown in FIG.

Further, after both pads 15 and 25 are thus inserted and arranged in the space 19 between the left and right arm portions 20a and 20a,
On top of this, the two retainer plates 30 and 34 are attached to the bolt 3
The pads 9 and 39 are attached to prevent the pads 15 and 25 from coming off. In addition, both end portions 17a and 27a of the back plates 17 and 27 of both pads 15 and 25, respectively.
Is a side surface 2 of the arm portions 20a, 20a forming the space.
It faces 0c and 20c closely.

In the opposed disc brake BR configured as described above, when the brake hydraulic pressure is supplied into the cylinder holes 11 and 21 through the tubes 7 and 8, the hydraulic pressure pushes the pistons 12 and 22, and the inner and outer parts are pressed. The pads 15 and 25 are pressed against the rotor 6. As a result, the linings 16 and 26 are provided on both side surfaces 6 of the rotor 6.
The pads 15 and 25 are pressed against a and 6b, and the pads 15 and 25 receive a force to rotate together with the rotor 6 due to the frictional force generated thereby. At this time, the back plate 1 of both pads 15 and 25
The side end portions 17a and 27a of the reference numerals 7 and 27 contact the side surface 20c of the arm portion 20a, and a braking force that blocks the rotation of the rotor 6 is applied to the rotor 6.

As described above, the rotation of the rotor 6 is braked and the rotation of the wheels is braked. Here, the linings 16 and 26 are made of a softer material than the rotor 6, and each time the brakes are applied, the linings 16 and 26 are
Wears out. The degree of this wear is affected by the friction heat generated between the rotor 6 and the linings 16 and 26 during braking, and the higher the temperature of the rotor 6 due to this friction heat, the greater the degree of wear.

Here, in the brake BR of the present embodiment, as shown in FIG. 4, the coupling surface B between the inner caliper 10 and the outer caliper 20 is located inward in the axial direction,
The caliper 10 and the caliper 20 are coupled by the coupling bolt 18 on the inner side of the inner surface 6 a of the rotor 6 in the axial direction. For this reason, the inner tip of the arm portion 20a of the outer caliper 20 is thick due to the formation of the screw portion for the coupling bolt 18, but the portion where the outer diameter end portion 6c of the rotor 6 faces the inner surface 20b. Is thinned to the outside, and the outer diameter of the rotor 6 is made large correspondingly.

When the outer diameter of the rotor 6 is large in this way, the heat dissipation of the rotor 6 is improved and the heat capacity is also increased, so that the temperature rise of the rotor 6 due to frictional heat during braking can be suppressed. As a result, wear of the linings 16 and 26 is suppressed, and the pad 1
The life of 5,25 is increased. In addition, since the outer diameter of the rotor 6 becomes large, the linings 16 and 26 can be made large, and the wear thereof is further suppressed because the surface pressure of the linings 16 and 26 decreases.

Further, in the case of this example, since the dimension from the inner side surface of the inner caliper 10 to the coupling surface with the outer caliper 20 is short, the coupling bolt 18 may be shorter than that of the conventional brake shown in FIG. The thick portion for the connecting bolt 18 becomes smaller. Therefore, the weight of the caliper can be reduced, and the weight of the entire brake can be reduced.

In the above embodiment, the brake having a structure in which the inner and outer pads are directly held by both calipers is shown, but a hanger pin is arranged between both calipers,
The hanger pin may be inserted into a through hole formed in the pad, and the pad may be held by suspending the pad with the hanger pin.

C. As described above, according to the present invention, the coupling surface between the outer caliper and the inner caliper is positioned axially inward from the inner surface of the rotor, and the inner caliper is coupled to couple both calipers. Since the thick part formed on the outer caliper is also located axially inward from the inner surface of the rotor to provide a female screw for screwing the coupling bolt inserted from the side, the outer diameter end of the rotor faces The thickness of the portion to be formed can be reduced within a range in which the strength can be secured, and the outer diameter of the rotor can be increased accordingly. As a result, the heat dissipation of the rotor is improved, the rotor temperature during braking can be kept low, and the pad lining area can be increased. As a result, the life of the pad can be improved. Further, by locating the coupling surface inside, it is possible to shorten the coupling bolt length and reduce the thick portion for this bolt, and to reduce the weight of the caliper and the brake using this caliper. You can

[Brief description of drawings]

1 and 2 are a front view and a plan view showing an opposed disc brake according to the present invention, and FIGS. 3 and 4 are arrow II in FIG. 1, respectively.
FIG. 5 is a sectional view showing the opposed disc brake along the lines I-III and IV-IV, and FIG. 5 is a sectional view showing a conventional opposed disc brake. 1 ... Anchor plate, 6 ... Rotor 10, 20 ... Caliper, 12, 22 ... Piston 15, 25 ... Pad

Claims (1)

[Scope of utility model registration request] 1. An outer caliper and an inner caliper, each of which has a piston slidably slidably and integrally coupled to each other, and is arranged so as to sandwich the rotor from both sides in the axial direction and face each of the pistons. In an opposed disc brake including an inner pad and an outer pad that are pressed against a side surface of a rotor to generate a braking force, a coupling surface between the outer caliper and the inner caliper is located axially inward from an inner surface of the rotor. Then, the coupling bolt inserted from the inner caliper side is screwed with the female screw of the outer caliper so as to couple both calipers, and the thick portion formed on the outer caliper for providing the female screw. Was positioned axially inward from the inner surface of the rotor. Opposed type disc brake, characterized and.