Automobile drum brake with forced air cooling heat dissipation function

Abstract

The utility model discloses an automobile drum brake with forced air cooling heat dissipation, which comprises an adjusting arm, an air chamber support, a cam shaft, a dust cover, a brake shoe, a shoe shaft, a tension spring, an air chamber and a brake drum, the dust cover is arranged on one side of the brake drum, and a brake drum inner cavity is formed by the dust cover and the brake drum. An air supply outlet communicated with an inner cavity of the brake drum is formed in the dustproof cover, a fan is fixedly installed at the position, where the air supply outlet is located, of the dustproof cover, the fan supplies air to the inner cavity of the brake drum through the air supply outlet, and forced air cooling heat dissipation of the automobile drum brake is achieved. The heat dissipation problem of the automobile drum brake is effectively solved in a very simple mode, and driving and road safety is guaranteed.

Description

Technical Field

[0001] The utility model relates to an automotive drum brake, and more specifically to an automotive drum brake with forced air cooling for heat dissipation. Background Art

[0002] Cam drum brakes are commonly used in light and heavy trucks. During use, air pressure is relied on to push the push rod in the brake chamber to push the adjusting arm and drive the camshaft to rotate, so that the cam lifts the brake shoe to friction against the brake drum to achieve deceleration and parking. The whole process is a process of converting kinetic energy into heat energy. Since the brake is in a nearly closed state, the air fluidity is very poor, and the heat generated by brake friction depends on natural heat dissipation, and its heat dissipation effect is very unsatisfactory; the heat generated by brake friction also depends on the use time and intensity of the brake. On long downhill sections, the temperature of the brake sometimes can reach several hundred degrees Celsius. High temperature causes the brake shoe to carbonize, the friction coefficient to decrease and brake thermal fade to occur, resulting in brake failure. It can also melt the lubricating grease of the hub bearing and flow into the brake drum, causing the bearing to be lubricated without oil and burned out. High temperature can cause the brake to catch fire, seriously threatening driving safety. To solve this problem, some drivers install a water tank on the vehicle and cool the brake drum by spraying water through a pipeline. However, in winter, the way of spraying water for cooling causes the road surface to freeze, seriously threatening traffic safety. Summary of the Utility Model

[0003] The utility model is to avoid the deficiencies of the above-mentioned prior art, and provides an automotive drum brake with forced air cooling for heat dissipation, which effectively solves the heat dissipation problem of the automotive drum brake in a simple way and ensures driving and road safety.

[0004] The utility model adopts the following technical solutions to solve the technical problems:

[0005] The automotive drum brake with forced air cooling for heat dissipation of the utility model includes an adjusting arm, an air chamber bracket, a camshaft, a dust cover, a brake shoe, a shoe shaft, a tension spring, an air chamber and a brake drum. The dust cover is arranged on one side of the brake drum, and a brake drum inner cavity is formed by the dust cover and the brake drum. An air supply port communicating with the brake drum inner cavity is opened on the dust cover. A fan is fixedly installed on the dust cover at the position where the air supply port is located. The fan supplies air to the inner cavity of the brake drum through the air supply port, realizing forced air cooling for heat dissipation of the automotive drum brake.

[0006] The characteristics of the automotive drum brake with forced air cooling for heat dissipation of the utility model also lie in that: the fan is arranged in a ducted double-blade structure, which means: a cylindrical shell with both ends penetrated is adopted, a motor is fixedly installed in the middle of the cylindrical shell by a motor bracket, an air duct is formed between the outer wall of the motor and the cylindrical shell, the motor is a double-shaft motor with output at both ends, a front fan blade and a rear fan blade are fixedly installed on the two shaft ends of the motor in one-to-one correspondence, so that the front fan blade and the rear fan blade are located at both ends of the cylindrical shell respectively.

[0007] The characteristics of the drum brake for automobiles with forced air cooling of the present utility model also lie in that a thermostat is fixedly installed on the dust cover, and the thermostat controls the start and stop of the fan according to the set temperature.

[0008] The characteristics of the drum brake for automobiles with forced air cooling of the present utility model also lie in that the thermostat is a temperature control switch, and the temperature control switch is serially arranged in the power supply circuit of the fan.

[0009] Compared with the prior art, the beneficial effects of the present utility model are embodied in:

[0010] 1. The present utility model effectively solves the heat dissipation problem of the drum brake of automobiles on long downhill sections in a very simple way.

[0011] 2. The present utility model does not need to set up other auxiliary facilities such as water tanks and is not affected by seasons.

[0012] 3. The present utility model is provided with a thermostat, and the thermostat automatically controls the start and stop of the fan according to the set temperature, which is convenient to use.

[0013] 4. The present utility model adopts forced air cooling, and its strong wind simultaneously removes the dust generated by the friction between the brake friction plate and the brake drum, making the inside of the brake dry and clean, and further improving the braking efficiency.

[0014] 5. The present utility model can be assembled for newly produced cars and can also be retrofitted for used cars, and is easy to implement. Description of the Drawings

[0015] Figure 1 is the front view structural schematic diagram of the present utility model;

[0016] Figure 2 is the side view structural schematic diagram of the present utility model;

[0017] Figure 3 is the fan structural schematic diagram of the present utility model;

[0018] Reference numerals in the figures: 1 adjusting arm, 2 air chamber bracket, 3 camshaft, 4 dust cover, 5 brake shoe, 6 shoe shaft, 7 tension spring, 8 air chamber, 9 thermostat, 10 air supply port, 11 front fan blade, 12 fan bracket, 13 fan, 14 rear fan blade, 15 brake drum, 16 cylindrical housing, 17 motor. Detailed Embodiment

[0019] See Figure 1 and Figure 2, in this embodiment, the forced air-cooled automotive drum brake includes an adjusting arm 1, a chamber bracket 2, a camshaft 3, a dust cover 4, brake shoes 5, a shoe shaft 6, a tension spring 7, an air chamber 8, and a brake drum 15. The dust cover 4 is arranged on one side of the brake drum 15, and a brake drum inner cavity is formed by the dust cover 4 and the brake drum 15.

[0020] See Figure 1 , in this embodiment, an air supply port 10 communicating with the brake drum inner cavity is opened on the dust cover 4. A fan 13 is fixedly installed on the dust cover 4 at the position where the air supply port 10 is located. The fan 13 supplies air into the inner cavity of the brake drum 15 through the air supply port 10 to achieve forced air-cooling of the automotive drum brake.

[0021] In this embodiment, as Figure 3 shown, the fan 13 is arranged in a ducted double-blade structure, which means: a cylindrical shell 16 with both ends penetrating is adopted. A motor 17 is fixedly installed in the middle of the cylindrical shell 16 by a motor bracket 12. An air duct is formed between the outer wall of the motor 17 and the cylindrical shell 16. The motor 17 is a double-shaft motor with outputs at both ends. The front fan blade 11 and the rear fan blade 14 are fixedly installed at the two shaft ends of the motor 17 in one-to-one correspondence, so that the front fan blade 11 and the rear fan blade 14 are located at both ends of the cylindrical shell 16 respectively. A high-speed fan is adopted, such as a product of Sanyo in Japan. Its rotational speed can reach 16,000 - 30,000 revolutions, and the maximum air volume is 30 CFM - 0.85 m3 / min. For the ducted double-blade high-speed fan, the air supply enters from the open end at the tail of the fan housing 16 and is driven by the rear blade 14 and the front blade 11 to supply air into the inner cavity of the brake drum 15 through the air supply port 10 to achieve forced air-cooling of the automotive drum brake.

[0022] In specific implementation, a thermostat 9 can be fixedly installed on the dust cover 4. The thermostat 9 controls the start and stop of the fan 13 according to the set temperature; the thermostat 9 adopts a temperature control switch, and the temperature control switch is connected in series in the power supply circuit of the fan 13. The temperature control switch is in the "on" state when the temperature reaches the set value, and the power supply of the motor is turned on to start forced air-cooling; the temperature control switch is in the "off" state when the temperature is lower than the set value, so that the power supply of the motor is turned off to stop forced air-cooling. The KSD9700 type thermostat can be adopted, and its set temperature is set to 95 °C.

Claims

1. A drum brake for automobiles with forced air cooling and heat dissipation, the drum brake for automobiles comprising an adjusting arm (1), an air chamber bracket (2), a camshaft (3), a dust cover (4), a brake shoe (5), a shoe shaft (6), a tension spring (7), an air chamber (8) and a brake drum (15), wherein the dust cover (4) is arranged on one side of the brake drum (15), and the dust cover (4) and the brake drum (15) form an inner cavity of the brake drum, wherein: The dust cover (4) is provided with an air supply port (10) which is in communication with the inner cavity of the brake drum. A fan (13) is fixedly installed on the dust cover (4) at the position where the air supply port (10) is located. The fan (13) supplies air to the inner cavity of the brake drum (15) through the air supply port (10), thereby realizing forced air cooling and heat dissipation of the automobile drum brake.

2. The automobile drum brake with forced air cooling and heat dissipation according to claim 1 is characterized in that: The fan (13) is configured as a ducted double-blade structure, which means that: a cylindrical shell (16) with two ends through is used, a motor (17) is fixedly installed in the middle of the cylindrical shell (16) using a motor bracket (12), and an air duct is formed between the outer wall of the motor (17) and the cylindrical shell (16); the motor (17) is a double-axis motor with output at both ends, and the front blades (11) and the rear blades (14) are fixedly installed on the two shaft ends of the motor (17) in a one-to-one correspondence, so that the front blades (11) and the rear blades (14) are respectively located at the two ends of the cylindrical shell (16).

3. The automobile drum brake with forced air cooling and heat dissipation according to claim 1 or 2, characterized in that: A thermostat (9) is fixedly mounted on the dust cover (4), and the thermostat (9) controls the start and stop of the fan (13) according to a set temperature.

4. The automobile drum brake with forced air cooling and heat dissipation according to claim 1 or 2 is characterized in that: The temperature controller (9) is a temperature control switch, which is arranged in series in the power supply circuit of the fan (13).

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