JPH0324382B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a brake cooling device installed in a vehicle.

The main structure of a disc brake installed on a vehicle consists of a disc rotor, a friction pad that comes into contact with the disc rotor, and a hydraulic cylinder that brings the friction pad into contact with the disc rotor. Oil is forced into the hydraulic cylinder to push out the piston, which presses the friction pad against the rotating disc rotor and applies a braking force to the rotation of the disc rotor. However, when the disc rotor is braked, frictional heat is generated in the disc rotor due to the frictional force between the disc rotor and the friction pad, as shown in FIG. 1, for example. The frictional heat of the disc rotor during braking is transmitted to the hydraulic cylinder via the friction pads or other brake components.
The brake oil in the hydraulic cylinder was heated (see Fig. 1), and as a result, a paper lock phenomenon occurred due to the heating of the brake oil.

The present invention was made in order to solve this problem, and it cools the disc brake by using a part of the cold air from the radiator cooling fan installed in the vehicle to cool the disc brake.
It is an object of the present invention to provide a cooling device for vehicle brakes that can eliminate the above-mentioned problems caused by heating of brake oil.

The vehicle brake cooling device of the present invention that achieves the above object is characterized by a temperature sensing element that detects the temperature of the brake system, and a comparator that generates an output signal when the temperature detected by the temperature sensing element exceeds a predetermined value. , a motor driven by the output signal from this comparator, a radiator cooling fan disposed downstream of the radiator and driven by the motor, and deflecting a trailing flow around the cooling fan periphery generated by the rotation of the radiator cooling fan. and a duct that guides the spray to the brake equipment.

The present invention will be described in detail below based on embodiments shown in the drawings.

Reference numeral 1 denotes a vehicle body, and the vehicle body 1 includes a well-known engine 2, a radiator 3, a cooling fan 4 for the radiator 3, and a disc brake 6 disposed opposite to the front wheels 5.
is equipped. Reference numeral 7 denotes a disc rotor that rotates together with each wheel 5, and the disc brake 6 described above is attached to each disc rotor 7 in correspondence with the disc rotor 7. 8 is the cooling fan 4
a duct for guiding and blowing a part of the cold air generated by the rotation of the cooling fan (swaft of the peripheral edge of the cooling fan) to both of the disc brakes;
9 is a motor that drives the cooling fan 4.

The configuration of this embodiment has been described above. Next, the drive control circuit for the cooling fan 9 and its control will be described. In FIG. 3, a drive motor 9 for a cooling fan 4 for cooling a radiator 3 is connected to a battery 12 via a thermoswitch 10 and an ignition switch 11, which close when the engine cooling water reaches a constant temperature or higher. a first circuit 13;
They are connected to a second circuit 15 connected to the battery 12 via a relay 14, and the relay 14 is turned on and off by the output from the temperature sensor 16.
It is something that is operated. That is, the temperature sensor 16
The temperature sensing element 16a detects the heating temperature of the disc brake 6, and the temperature detected by the temperature sensing element 16a is compared with the arbitrarily set set temperature 16b, and the detected temperature is equal to or higher than the set temperature. It consists of a comparator 16c which outputs an output when the voltage rises to 1, and an amplifier 16d which amplifies the output.

Since the first circuit 13 described above is conventionally well known, a description of its operation will be omitted, but the operation of the second circuit 15, which is the gist of the present invention, will be described. When the disc drum 7 is braked, frictional heat is generated and when the heating temperature of the disc brake 6 becomes equal to or higher than the set temperature 16b, an output is output from the temperature detector 16 and the relay 14 is closed. When this relay 14 is closed, the motor 9 is driven and the fan 4 is rotated, and a portion of this cold air is blown onto the disc brake 6 through the duct 8, thereby cooling the disc brake 6. In this way, when the heating temperature of the disc brake 6 falls below the set temperature, the output from the temperature detector 16 is cut off.
Since the relay 14 becomes open, the fan stops. In this way, even when the vehicle is stopped and the engine coolant temperature is low, the disc brake 6
Since the fan 4 is driven when the disc brake 6 is heated, the disc brake 6 is effectively cooled. That is, in a conventional vehicle, for example, when driving down a long slope by applying the brakes using the disc brake and not using the engine brake, the thermosensor 10 becomes an open circuit because the water temperature in the radiator does not rise, and the fan motor However, according to this embodiment, even if the thermosensor 10 is in an open state, if the heating temperature of the disc brake 6 is high, the fan motor 9 is driven. Since the disc brake 6 is cooled, the vapor lock phenomenon of the brake oil can be prevented, and the braking effect of the disc brake can be enhanced.

As described above, the present invention includes a temperature sensing element that detects the heating temperature of a disc brake, a comparator that outputs an output when the detected temperature of the temperature sensing element becomes higher than an arbitrary set temperature, and an output from this comparator. It is equipped with a relay that closes the radiator cooling fan motor drive circuit and a duct that blows a portion of the cold air generated by the rotation of the fan onto the disc brake, so that the heating temperature of the disc brake reaches a constant temperature or higher. According to this, the disc brake is cooled by driving the fan motor, regardless of the engine drive, that is, regardless of the temperature of the engine cooling water. If the disc brake is heated, the cooling fan can be driven to cool the disc brake, thereby preventing the vapor lock phenomenon of the brake oil. Further, since the cooling fan can also be used as a fan for cooling the radiator, the space of the vehicle is not reduced, and there are effects such as improved economic efficiency.

[Brief explanation of drawings]

Fig. 1 is a characteristic diagram showing the heating temperature of the brake during braking, Fig. 2 is an explanatory diagram of a vehicle equipped with the brake cooling mechanism according to the present invention, and Fig. 3 is an operational circuit diagram of the same brake cooling mechanism. It is. 1...Vehicle body, 2...Engine, 3...Radiator, 4
...Cooling fan, 5...Wheel, 6...Disc brake, 7...Disc rotor, 8...Duct, 9...Motor, 10...Thermo switch, 11...Ignition switch, 12...Battery, 13...First circuit, 14 ...Relay, 15...Second circuit, 16...Temperature detector, 16a...Temperature sensing element, 16b...Set temperature, 16c...Comparator, 16d...Amplifier.

Claims (1)

[Claims] 1 A temperature sensing element that detects the temperature of the brake device,
A comparator that generates an output signal when the detected temperature of this temperature sensing element exceeds a predetermined value, a motor that is driven by the output signal from this comparator, and cooling of the radiator that is located behind the radiator and is driven by the motor. A cooling device for vehicle brakes, comprising a fan and a duct that deflects and guides a wake from the peripheral edge of the cooling fan generated by the rotation of the cooling fan of the radiator so as to blow it onto the brake device.