JPH0565055A - Coolant injection type forced cooling method for multi-disc brake - Google Patents

Abstract

PURPOSE:To cool a multi-disc brake by injecting a coolant or the like in case of emergency so that service is available even though the discs have attained an extreme high temp. after stopping upon absorption of a high energy without ill influence due to temp. rise of the peripheral apparatus. CONSTITUTION:Pipings 9, 8 for cooling are furnished at the key part of a torque tube 3 and the periphery of discs, and a coolant such as water, fire extinguishing liquid, etc., is injected directly to the disc surfaces.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to cooling of emergency multi-disc brakes for high speed objects such as magnetically levitated railway vehicles.

[0002]

2. Description of the Related Art Conventional multi-disc brakes are used in aircraft and the like, but since they are used as regular brakes, their cooling method is natural cooling, or a fan is used to force the air flow into the wheel. This is a cooling method to be generated.

[0003]

When an attempt is made to absorb vehicle kinetic energy from a high speed by a wheel disc brake, the disc brake in a limited space causes the disc to reach an extremely high temperature.

Usually, since it is assumed that the disk is repeatedly used, the operation is such that the amount of absorbed energy is naturally limited, and it is not possible to operate with the absorbed energy making the most of the maximum heat capacity of the disk itself, but it is used as a backup brake in an emergency. If so, the frequency of use is low and there is a long use interval, so we want to make the most of the heat capacity of the disk.

However, when operating as an emergency brake in this way, the disk temperature also becomes extremely high.
It is necessary to take measures to avoid re-rolling due to melting of the disc end fittings, tire burst, wheel strength decrease, carrier oil temperature rise, and other adverse thermal effects on peripheral equipment.
For example, the issue is how to dissipate heat to the atmosphere.

[0006]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention directly applies a coolant such as water or a fire extinguishing liquid to a multi-disc which has been heated to a high temperature due to frictional heat when a vehicle is stopped for a certain period of time It is characterized by jetting.

[0007]

[Operation] Water, etc. sprayed on the inner and outer surfaces of the multi-disc,
The amount of heat corresponding to the temperature rise and the heat of vaporization is absorbed from the disc, and the disc temperature is lowered. Furthermore, when it becomes water vapor, it diffuses and releases heat to the atmosphere.

As a result, the amount of heat transferred to the tire, the leg mechanism such as the wheel, and the peripheral equipment due to heat conduction, radiation, etc. is reduced, and as a result, the temperature rise thereof is suppressed.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view of a disc brake device provided with inner and outer cooling pipes, and FIG. 2 is an enlarged view of a rotor end fitting.

A wheel 1 is mounted on an axle 2, a disc brake device is housed in the wheel 2, and a torque tube 3 thereof is fixed to an axle flange 4.

In the multi-disc, rotors 5 (rotating together with the wheel) fixed to the key portion on the inner surface of the wheel and stators 6 (non-rotating) fixed to the key portion of the torque tube 3 are alternately arranged. The braking force is obtained by pressing these with the piston 7 and the frictional force between the rotor and stator at that time, and this contact surface serves as a heat source.

The cooling pipe 7 can penetrate the key portion of the torque tube 3 to directly inject the coolant from the injection port on the upper surface or the side surface of the key portion to the high temperature disk. Normally, a heat shield plate is inserted between the surface of the torque tube and the disc, but it suffices to provide a hole only in the ejection port portion.

In order to prevent the rotor end fitting from melting, a cooling pipe is provided in the vicinity thereof (on the outer circumference of the disk) for injection.

Although FIG. 1 shows the case where both the inner and outer circumferences are provided, it is possible to use only the inner circumference or only the outer circumference.

[0015]

By cooling using this method,
It is possible to avoid the re-rolling failure, the tire burst, the wheel strength reduction, the oil temperature rise in the carrier, and other adverse thermal effects on peripheral equipment due to the melting of the disk end fittings.
Further, the absorbed energy of the brake increases by the amount corresponding to the temperature rise of water and the heat of vaporization compared to the equivalent brake without the injection device. Alternatively, if the absorbed energy is equivalent, the brake main body can be made smaller.

[Brief description of drawings]

FIG. 1 is a sectional view of a brake provided with inner and outer circumference cooling pipes.

FIG. 2 is an enlarged view of the vicinity of a rotor end fitting.

[Explanation of symbols]

 1: Tire wheel 2: Axle 3: Torque tube 4: Axle flange 5: Rotor 6: Stator 7: Piston 8: Peripheral cooling pipe 9: Inner peripheral cooling pipe

Claims (3)

[Claims] 1. In an emergency multi-disc brake operation, a coolant such as water or a fire extinguishing liquid is directly injected into a multi-disc brake heated to a high temperature by frictional heat for a certain period of time after the vehicle is stopped. Coolant injection forced cooling method for disc brakes. 2. The method for forcibly cooling a coolant for a multi-disc brake according to claim 1, wherein the coolant is injected to the inner surface of the multi-disc by utilizing the key portion of the torque tube. 3. The method of forced cooling of a coolant for a multi-disc brake according to claim 1, wherein the coolant is sprayed to the outer surface from a pipe provided on the outer periphery of the multi-disc.