JPH0140346Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a caliper in a disc brake in which cooling fins are provided on the outer surface of the pressurizing chamber of the caliper to reduce a rise in the temperature of hydraulic fluid.

The caliper in a disc brake has a piston built into the pressurized chamber of the caliper body, and when the brake pedal is pressed during braking, the master cylinder is actuated, and the pressurized hydraulic oil generated there is introduced into the pressurized chamber and pushes out the piston. A pad serving as an abrasive material is pressed against the side surface of the rotor on the end face of the piston, and the rotation of the rotor is braked by frictional force. Therefore, during braking, the temperature of the pressurized hydraulic oil increases due to pressurization, and the temperature increases due to the frictional heat between the pads and rotor, and when the vehicle is running, the temperature is usually 130℃ to 150℃. becomes. Therefore, there is a problem that air in the hydraulic oil separates or a so-called vapor lock condition occurs even if there is a small amount of water contained therein. The purpose of this invention is to provide a caliper for a disc brake that solves this problem and has cooling fins formed on the outer surface of the caliper body to reduce the temperature rise of the hydraulic oil. It is.

This invention will be explained based on the illustrated embodiment.

FIG. 1 is an explanatory cross-sectional view with a portion of a conventional disc brake removed. In the figure, 1 is a caliper body, 2 is a pressurizing chamber, 3 is a piston, 4 is an inner pad back plate, 5 is an inner pad, 6 is a rotor, 7 is an outer pad, and 8 is an outer pad back plate. In the disc brake, when pressurized hydraulic oil is introduced into the pressurizing chamber 2, the piston 3 moves to the right in Figure 1, presses the inner pad 5 as a wear material against the rotor 6 via the inner pad back plate 4, and at the same time Due to the reaction, the caliper body 1 becomes the first
Move to the left in the figure, press the outer pad 7 as a wear material against the rotor 6 via the outer pad back plate 8 with the inner surface of the protruding wall 9 of the caliper main body 1,
The inner pad 5 and the outer pad 7 are configured to sandwich and brake a rotor 6.

Therefore, in this invention, as shown in FIG. 2 and FIG.
0 is provided and formed. The fins 10 are provided parallel to the axis of the piston 3. In addition, in a caliper with a single built-in cylinder, in order to make the heat dissipation effect uniform, one fin is installed on the vertical plane that includes the axis of the piston 3, and the other multiple fins 10 are symmetrically arranged with the same spacing on the left and right sides. It will be located at

Also, as in the illustrated embodiment, two pistons 3
In a caliper with a built-in fin 10, one fin 10 is placed on a vertical plane that includes the midpoint of the axes of the two pistons 3.
The other plurality of fins 10 are formed with the same spacing on the left and right sides so as to be symmetrical on the left and right sides.
Furthermore, these fins 10 are formed so that the height of the fins 10 after installation is approximately on a straight line, regardless of the curved shape of the outer surface at a position corresponding to the pressurizing chamber 2 in the direction perpendicular to the axis of the caliper body 1. ,
The protruding height is the rotor 6 of the caliper body 1.
It is formed to be slightly lower than the maximum height on the outer surface 12 at the position corresponding to the position corresponding to the height, so that it can be easily attached, and it is formed to have an appropriate distance from other parts. Furthermore, the positional relationship of the fin 10 and the piston 3 in the axial direction is
One end is provided on the outer surface at a position corresponding to the bottom surface of the pressurizing chamber 2, and the other end is provided on the outer surface 11 of the caliper body 1 at a position corresponding to the piston 3 and the rotor 6. Outer surface 12 in corresponding position
It is formed so as to be provided along the curved surface 13 that is connected to the curved surface 13.

The fins 10 may be formed by casting integrally with the caliper body 1, but in order to reduce the weight of the entire brake device and further enhance the heat dissipation effect, the fins 10 may be formed by casting as shown in FIGS. 4, 5, and 6. It is formed by punching out a thin steel plate, and the contact portion 14 with the caliper body 1 is bent into a band shape, and this portion is fixed to the caliper body 1 with screws. In this case, the contact portions 14 of the fins 10 are formed into a contact portion 15 and a contact portion 16 which are bent in opposite directions, so that the fins 10 will not spring back after being attached. Further, the contact portion 14 is also formed at an end portion formed to follow the curved surface 13 that connects the outer surface 11 of the caliper body 1 at a position corresponding to the piston 3 and the outer surface 12 at a position corresponding to the rotor 6. Make it. In other words, the contact portion 14 is also formed on this curved surface 13, which is exposed to the attack of the scorching powder of the worn pad and has a high temperature rise, so as to enhance the heat dissipation effect.

In addition, when fixing by providing a contact portion 14 that contacts only the outer surface 11 at a position corresponding to the piston 3, the contact edges between the fins 10 and the curved surface 13 are spot welded with an appropriate interval. Formed to enhance thermal effect. Alternatively, the periphery of the contact portion 14 of the fin 10 with the caliper body 1 may be fixed by welding.

Since this invention is constructed as claimed in the utility model registration claims based on the above-described embodiment, it is possible to reduce the rise in the temperature of the hydraulic oil in the pressurizing chamber of the caliper. In fact, in a running test of a truck equipped with fins shown in the example, a temperature lowering effect of 30°C to 40°C was observed, and the maximum hydraulic oil temperature could be suppressed to 120°C or less. Furthermore, since the fins are provided parallel to the piston axis, heat from the outer surface of the caliper, where the rotor is located, where the temperature rise is most significant, can be efficiently radiated. Furthermore, since the fins are formed by punching out a thin steel plate, the weight of the fins as a whole can be made extremely light, and the heat dissipation effect can be maintained at a high level. In addition, since the air flowing in from the outside of the vehicle passes through the fin spacing and immediately flows out to the rear of the vehicle, it has become possible to provide a caliper for disc brakes equipped with cooling fins that have little trapped air flow and extremely high heat dissipation. .

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional explanatory view with a part of the conventional disc brake removed, Fig. 2 is a cross-sectional explanatory view of the caliper body according to this invention, Fig. 3 is a front view thereof, and Fig. 4 is a front view of the fin. 5 is a plan view thereof, and FIG. 6 is a side view thereof. Explanation of symbols, 1... Caliper body, 2... Pressure chamber, 3... Piston, 4... Inner pad back plate, 5
... Inner pad, 6... Rotor, 7... Outer pad, 8... Outer pad back plate, 9... Projecting wall,
DESCRIPTION OF SYMBOLS 10... Fin, 11... Outer surface where piston is located, 12... Outer surface where rotor is located, 13... Curved surface, 14, 15, 16... Contact portion.

Claims (1)

[Scope of utility model registration request] In a caliper for a disc brake, on the upper outer surface of the caliper body 1 at a position corresponding to the pressurizing chamber 2, on a vertical plane parallel to the axis of the piston 3 and including the midpoint between the axes of the two pistons 3. The strips are formed of thin steel plates symmetrically with respect to the vertical plane as a plane of symmetry, with spaced apart intervals, and are bent in opposite directions at the contact edge with the upper outer surface of the caliper body 1 to form a band shape. Contact parts 14, 15
A caliper in a disc brake equipped with cooling fins, characterized in that the belt-shaped contact parts 14 and 15 are fixed to the caliper main body 1, and a plurality of fins 10 formed at approximately the same height are provided.