JPH0213783Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a floating caliper type brake device, and more particularly to a floating caliper type brake device that applies pads in the radial direction of a drum-shaped rotor.

As brakes for vehicles, generally disc brakes are used for the front wheels and drum brakes are used for the rear wheels. The floating caliper type brake device of the present invention is a floating caliper type brake device that performs braking by sliding a caliper that fits into a caliper sliding hole provided in the knuckle body on a drum-shaped rotor that rotates together with the wheel. It is a pa-type brake device and is suitable for use on the front wheels.

The purpose of this invention is to obtain a higher braking torque by increasing the braking friction radius on which the pads act compared to a disc brake, and the second purpose is to achieve better heat dissipation than a normal drum brake. This is to avoid the decrease in braking efficiency due to the fade phenomenon that tends to occur in drum brakes.The third purpose is to use pads to improve maintenance by making replacement easier compared to the shew of drum brakes. The fourth object is to provide a lightweight and inexpensive brake that has a simple structure for supporting the caliper.

An embodiment of the present invention will be described based on the drawings.

1 is a knuckle, and a caliper slide hole 2 is provided in the knuckle 1 of the vehicle, into which the outer periphery of a cylinder portion 4 formed by the rear arm itself of the caliper body 3 is fitted so as to be slidably guided; The caliper main body 3, which has a connecting part that straddles the drum 5 (drum-shaped rotor) and connects the rear arm and the forearm 10 forming the cylinder part 4, has a braking friction formed by the body of the drum 5, which is fixed to a wheel and rotated. It is slidably guided in the radial direction toward the circumferential surface 6a. A piston 7, which also slides toward the brake friction circumferential surface 6a due to pressure oil from the outside, is fitted into the inner periphery of the cylinder portion 4, and an inner pad 8 is attached to the head of the piston 7, which is attached to a back plate 9.
It is integrally supported in contact with the Also, on the forearm 10 of the caliper, the outer pad 11 is connected to the back plate 12.
It is fixed as one. The inner pad 8 and the outer pad 11 sandwich braking friction circumferential surfaces 6a and 6b formed by both the front and back surfaces of the drum 5 body. 13 is an air vent hole.

Incidentally, the pads 8, 11 which receive the braking torque may be supported not only by the caliper body as described above but also by an arm separately projecting from the knuckle.

The floating caliper type brake device according to the present invention is constructed as described above, so that when pressure oil is introduced into the cylinder portion 4 from the outside during braking, the inner pad 8 is moved by the piston 7 to the drum 5. Simultaneously, the caliper main body 3 slides inward within the caliper slide hole 2 due to the reaction, and presses the outer pad 11 against the braking friction circumferential surface 6b of the drum 5. Then, the braking friction circumferential surfaces 6a, 6b of the drum 5 are clamped by both pads 8, 11 to generate a braking force.

Therefore, according to the present invention, compared to a disc brake, a larger braking friction effective diameter can be ensured, so higher braking torque can be obtained, and compared to a conventional drum brake, the braking friction surface has a drum shape. Since the pads are on both sides of the rotor body, the contact area of the pads during braking is small, and most of the braking friction surface is directly exposed to the atmosphere, which improves heat dissipation and prevents fading. Therefore, replacing the shoe is easier than replacing the shoe in a drum brake. Furthermore, the caliper sliding guide is
Since the caliper slide hole provided in the knuckle fits with the outer periphery of the cylinder portion formed in the rear arm of the caliper, the structure is simple, lightweight, and inexpensive.

[Brief explanation of drawings]

The figure is a sectional view of a floating caliper type brake device according to the present invention. 1...Natsukuru, 2...Caliper slide hole,
3...Caliper body, 4...Cylinder part, 5...
Drum rotor, 6a, 6b... braking friction circumferential surface (braking friction surface), 7... piston, 8... inner pad, 10... forearm, 11... outer pad.

Claims (1)

[Scope of utility model registration request] The caliper body has a rotor that rotates together with the wheel and has front and back surfaces as braking friction surfaces, a forearm that straddles the rotor and supports the outer pad in abutment, a rear arm that forms a cylinder portion, and a connecting portion that connects the forearm and the rear arm. A piston with an inner pad abutting and supported on the inner periphery of the cylinder is slidably fitted, and the outer periphery of the cylinder is fitted so as to be slidably guided in a caliper slide hole provided in a knuckle of the vehicle. A floating caliper type brake device that is characterized by a combination of