JPH03578Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] This invention is equipped with a shape-memory alloy running wind introduction fin and a shape-memory alloy alarm claw on the bridge connecting the first arm and the second arm of the carrier body. Regarding disc brakes.

[Conventional technology]

When the brakes are overused when the vehicle is running, the pads or shoes and disks or drums may overheat, reducing the coefficient of friction and causing a so-called fade phenomenon in which the effectiveness of the brakes decreases.

To prevent this, it is common practice to blow running air into the brake drum to cool the drum, shoe, etc.
The publication states that a brake panel of a motorcycle is provided with a running air intake that opens toward the direction of movement of the vehicle body, a cover that can be opened and closed laterally is attached to the opening, and a running air outlet is provided on the wheel hub. Types that increase the amount of air that enters the drum are known.

In addition, as a warning for this, for example, Japanese Utility Model Application Publication No. 58-50060 discloses that the temperature inside the drum brake is sensed, and when the temperature reaches a temperature that may cause brake drum fade, 2. Description of the Related Art An electric fade alarm device that outputs an alarm signal is known.

[The problem that the idea attempts to solve]

However, in conventional cooling devices of this type, the opening and closing of the lid is done manually, and furthermore, it is not possible to automatically adjust the degree of overheating within the brake. Further, such electric alarm devices have the disadvantage that they have a complicated structure and are extremely expensive.

Therefore, the present invention takes advantage of the properties of shape memory alloys that deform into a predetermined shape at a certain temperature, and makes them memorize so that they will stretch into a certain shape when a predetermined temperature is reached, which can cause the fade phenomenon. A running wind introduction fin made of a shape memory alloy and an alarm pawl made of a shape memory alloy are attached to the bridge part, and when the inside of the disc brake reaches a certain temperature, the pad and disc are cooled by blowing air with the running wind introduction fin. To provide a disc brake which generates an alarm sound by bringing the tip of an alarm pawl into contact with the outer periphery of the disc.

[Means to solve the problem]

In order to achieve the above object, the disc brake according to the present invention has an opening on the outer periphery of the disc at the bridge part, covers the opening when the temperature inside the disc brake is below a predetermined temperature, and expands when the temperature inside the disc brake reaches a predetermined temperature or higher. A shape-memory alloy running wind introduction fin that opens outward is attached, and is shaped so that when the temperature inside the disc brake reaches a predetermined temperature or more, the tip extends and comes into contact with the outer periphery of the disc near the outer periphery of the disc at the bridge part. It is characterized by being equipped with a warning claw made of memory alloy.

[Effect]

Since the present invention is constructed as described above, when the brake pads and disks are overheated to a predetermined temperature or higher due to heavy use of the brakes while driving, the driving wind introduction fins extend and open outward from the bridge section, allowing the vehicle to travel from the front of the vehicle. It catches wind and introduces it into the caliper through the bridge opening to cool the overheated pads and disks. Further, when the pad and the disk reach a temperature that may cause a fade phenomenon, the warning pawl extends and its tip contacts the outer periphery of the disk, producing an alarm sound.

〔Example〕

Hereinafter, one embodiment of the present invention will be described based on the drawings.

Reference numeral 1 denotes a disk that rotates together with the wheels, and projections 1a are formed on the outer periphery of the disk at predetermined intervals in the axial direction of the disk. 2 is the Kyaripa body, the first
The arm 3 and the second arm 4 are integrally formed across the disk 1 by a bridge portion 5, and a substantially rectangular opening 6 is bored in the outer periphery of the disk in the bridge portion 5. A piston 7 is slidably provided in a cylinder 8 formed in the first arm 3, a bracket 9 is fixed to a part of the vehicle body, and 10 is pressed against the disk 1 by the operation of the piston 7. friction pad,
11 is its back plate, 12 is a friction pad pressed against the disk 1 by the second arm 4, 13 is its back plate,
Both back plates 11 and 13 are slidably held by a bracket 9.

Reference numeral 14 denotes a cooling/warning member made of a shape memory alloy, which is formed by integrally forming a running wind introduction fin 14a and a fade warning pawl 14b via a connecting portion 14c, and is used to prevent the temperature inside the disc brake from causing a fade phenomenon. When the temperature is below a certain level where there is no risk of fading, the cross section is bent into a substantially U-shape as shown by the solid line in Figure 2, and when the temperature reaches a temperature where there is a risk of fading, the wind is introduced as shown by the two-dot chain line in Figure 2. Finn 1
4a and the alarm claw 14b are stored to be separated.

The mounting portion 14c of the cooling/warning member 14 is fixed to a metal piece 15 fixed to the opening wall 5a of the opening 6 of the bridge portion 5 in the direction opposite to the traveling direction.

The running wind introducing fin 14a is provided so as to cover the opening 6 of the bridge portion 5 to block the running wind when the temperature inside the disc brake is below a predetermined value that does not cause the fade phenomenon, thereby preventing the risk of causing the fade phenomenon. When the bending portion 14d reaches a certain predetermined level or more, the bent portion 14d expands and opens outward from the bridge portion 5 to introduce the traveling wind.

Further, the alarm pawl 14b is provided so as to be substantially flush with the inner wall 5b of the bridge portion 5 when the temperature is below a predetermined value that does not cause a fade phenomenon, and when the temperature reaches a predetermined value or more that may cause a fade phenomenon. When the bent portion 14e expands and opens inward of the bridge portion 5, its tip 14f comes into contact with the protrusion 1a on the outer periphery of the disk 1, thereby emitting an alarm sound.

In this embodiment, the protrusion 1a is provided on the outer periphery of the disk 1 so that the alarm pawl 14b comes into contact with it to generate the alarm sound, but it is not necessary to provide the protrusion on the outer periphery of the disk 1. may be formed. Even in this case, an alarm sound can be generated by sliding with the alarm claw 14b.

Further, in this embodiment, the traveling wind introduction fin 14a and the alarm pawl 14b are formed integrally, but they may be provided separately.

[Effect of idea]

As described above, the present invention provides an opening on the outer periphery of the disc at the bridge part, and covers the opening when the temperature inside the disc brake is below a predetermined temperature, and expands and extends outward when the temperature inside the disc brake reaches a predetermined temperature or higher. Since the shape-memory alloy driving wind introduction fin that opens is installed, it senses the temperature when there is a risk of brake fade, and automatically opens the driving wind introduction fin to catch the driving wind, allowing the caliper to flow through the bridge opening. It is possible to cool the overheated pad and disk and prevent the occurrence of a fade phenomenon. In addition, a shape-memory alloy alarm pawl is installed near the outer circumference of the disk at the bridge part, which expands when the temperature inside the disk brake reaches a certain level and makes contact with the outer circumference of the disk, so there is no risk of the brake fading. At certain times, the temperature is sensed and the alarm claw automatically extends and comes into contact with the outer periphery of the disk to emit an alarm sound, thereby giving advance warning of the occurrence of the fade phenomenon. This also makes it possible to suppress vapor lock. Moreover, since the tip of the shape memory alloy alarm pawl contacts the outer periphery of the disk, the warning pawl does not damage the sliding surface of the disk. Furthermore, since the traveling wind introduction fins and the alarm pawl are simply attached to the bridge portion, the structure is simple and inexpensive.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, with FIG. 1 being a sectional front view and FIG. 2 being a sectional side view of the main part. DESCRIPTION OF SYMBOLS 1...Disk, 1a...Protrusion, 5...Bridge part, 6...Opening, 14...Cooling/warning member, 1
4a...Traveling wind introduction fin, 14b...Alarm claw.

Claims (1)

[Scope of utility model registration request] In a disc brake that straddles a disc that rotates together with a wheel by a bridge part connecting a first arm and a second arm of a carrier body, and performs braking by pressing pads arranged on both sides of the disc against the disc, the bridge part An opening is provided on the outer periphery of the disc, and a shape memory alloy running wind introduction fin is attached to the bridge part that covers the opening when the temperature inside the disc brake is below a predetermined temperature, and expands and opens outward when the temperature inside the disc brake reaches a predetermined temperature. In addition, a shape memory alloy warning pawl is attached to the bridge portion near the outer circumference of the disk when the temperature inside the disk brake reaches a predetermined value or more, and the tip thereof extends and comes into contact with the outer circumference of the disk.