JP2544943Y2 - Braking fluid temperature detector in brake - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION A brake fluid temperature detector for a brake according to the present invention informs a driver of a rise in the temperature of the brake fluid, the temperature of which increases with use of the brake, and the brake cannot be operated due to vapor lock. Used to prevent

[0002]

2. Description of the Related Art In a brake of an automobile, a pad is pressed against a rotor by a piston which is extruded by a brake fluid pressure (in the case of a disc brake), and a brake shoe is pressed against a drum (in the case of a drum brake), to thereby produce a rotor or a brake. It brakes wheels that are linked to the drum, but generates heat due to friction between the pad or brake shoe and the rotor or drum.

[0003] The temperature of the brake fluid rises due to this heat, and when the temperature rises remarkably, part of the brake fluid evaporates and the brake fluid loses incompressibility, so that the piston can be pushed out even if the brake pedal is depressed. Causes a vapor lock phenomenon in which the brakes stop working.

In order to prevent the vapor lock phenomenon, it is necessary to perform the brake operation while monitoring the temperature of the brake fluid so that the temperature of the brake fluid does not rise significantly. Therefore, the driver is informed of the temperature of the brake fluid. The device is considered.

FIG. 3 shows a conventional example of a brake fluid temperature detector in a disk brake, wherein 1 is a rotor, 2 and 3 are pads, 4 is a cylinder, 5 is a piston, 6 is a caliper, 7
Indicates a nail.

In the brake fluid temperature detector, a screw hole 8 communicating with the cylinder 4 is formed in the caliper 6 and a sensor 9 is formed in the screw hole 8.
The temperature of the brake fluid entering the screw hole 8 is detected by the sensor 9. Reference numeral 11 denotes a connection fitting attached to an end of a flexible hose 12, which is a brake fluid pressure transmission pipe for pressure-feeding the brake fluid to the cylinder 4.

[0007]

In the conventional brake fluid temperature detector, as shown in FIG. 3, a screw hole dedicated to mounting a sensor is formed separately from a screw hole for transmitting hydraulic pressure in a cylinder portion. Therefore, since the sensor is mounted in a liquid-tight manner, the number of processing steps is increased and the cost is increased.

[0008]

According to the present invention, a sensing portion of a thermocouple that generates an electric output in response to a temperature change is fitted to a connection screw portion of a brake hydraulic pressure transmission pipe screwed to a wheel cylinder. The brake fluid temperature detector for the brake is fixed to the washer that fits, and when the brake fluid pressure transmission pipe is screwed into the wheel cylinder, this washer is clamped between the wheel cylinder and the mounting bracket and tightened. By attaching the detector to the wheel cylinder, the temperature of the brake fluid is known so that new drilling is not required.

[0009]

When the washer is fastened to the wheel cylinder by the fitting of the brake hydraulic pressure transmission pipe, the temperature of the washer becomes equal to the temperature of the wheel cylinder in that portion. Since the temperature of this portion is almost equal to the temperature of the brake fluid, the temperature of the brake fluid can be detected by detecting the temperature of the washer with a thermocouple, and an alarm device can be activated when the fluid temperature rises.

[0010]

1 is a perspective view of a brake fluid temperature detector in a brake according to the present invention, and FIG. 2 is a longitudinal sectional view of a disk brake to which the brake fluid is attached, and also schematically shows a connection with a warning light.

In FIG. 1, reference numeral 13 denotes an alumel-chromel thermocouple, and a sensing portion 14 is inserted into a groove-shaped connection portion 16 formed on one end of a copper washer 15 so that the connection portion 16 is connected to a cap. The thermocouple 13 is mechanically connected to the washer 15.

This detector is mounted on a disc brake as shown in FIG.

In FIG. 2, a connection fitting 11 attached to an end of a flexible hose 12 which is a brake hydraulic pressure transmission pipe.
Is screwed into the liquid passage hole of the cylinder 4 which is a wheel cylinder, the washer 15 is fitted to the threaded portion of the connection fitting 11, and the fitting 11 is fastened to the caliper.

Heat generated by friction between the rotor 1 and the pad 2 is transmitted from the piston 5 to the brake fluid and the caliper 6, and then to the washer 15 therethrough. As a result, the temperature of the washer that rises becomes almost the same as the temperature of the brake fluid in the cylinder 4, and an output signal corresponding to this temperature is output from the thermocouple 13.

The output signal of the thermocouple 13 is amplified by an amplifier 17 and enters a control device 18. The output of the control unit is
The light emitting diode 19 and the resistor 20 are connected in series to three sets of circuits, and emit any one of green, yellow, and red light emitting diodes according to the output of the control device, and the temperature of the brake fluid is within a safe range. Warns you if you are approaching a danger area or if you are no longer in danger.

[0016]

[Effects of the Invention] (1) The brake fluid temperature detector made by connecting the sensing part of the thermocouple to the washer has a simple structure and is easy to manufacture.

(2) There is no need to process the cylinder to mount the detector.

(3) Therefore, a brake can be manufactured at low cost.

(4) It can be attached to a brake that is already in use.

(5) It can be used for both disc brakes and drum brakes.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment of a brake fluid temperature detector in a brake according to the present invention.

FIG. 2 is a longitudinal sectional view of a disc brake to which a brake fluid temperature detector is attached.

FIG. 3 is a longitudinal sectional view showing one example of a conventional disc brake to which a brake fluid temperature detector is attached.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Rotor 2 Pad 3 Pad 4 Cylinder 5 Piston 6 Caliper 7 Claw 8 Screw hole 9 Sensor 10 Mounting bracket 11 Connection bracket 12 Braking fluid pressure transmission pipe 13 Alumel Chromel thermocouple 14 Sensing part 15 Washer 16 Connection part 17 Amplifier 18 Control device 19 light emitting diode 20 resistor

Claims (1)

(57) [Scope of request for utility model registration] 1. A sensing part (14) of a thermocouple (13) for outputting an electric output in response to a temperature change is connected to a connection screw part of a brake hydraulic pressure transmission pipe (12) screwed to a wheel cylinder. A brake fluid temperature detector for a brake fixed to a washer (15) to be fitted.