JPS6229983B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cooling device for an electromagnetic retarder, which is a deceleration brake for a vehicle.

The present applicant has invented a new electromagnetic retarder as a vehicle deceleration brake, and has filed a patent application filed at the same time as this application.

This electromagnetic retarder uses a flywheel mounted on the crankshaft between the engine and the transmission as the retarder rotor, and the flywheel housing has an excitation coil and a short-circuit ring as the field that excites the flywheel. Even if the engine becomes smaller and lighter and its total displacement decreases, it still provides a braking force commensurate with the gear ratio of the transmission, just like a conventional engine brake, and has a special retarder unit. does not require a propeller shaft,
It is an excellent retarder that is lightweight and easy to control.

Conventional electromagnetic retarder cooling devices eliminate ohmic heat due to eddy currents generated in a magnetic disk around which an excitation coil is wound when it is rotated in a magnetic field created by this coil. It was designed to be cooled by the iron part of the disk and the fins of the rotor. In other words, since this cooling device cools the rotating disc by air cooling, the entire rotating body including the heat generating part must be cooled.In order to improve the cooling capacity, the iron parts and rotor It was necessary to increase the size of the fins, etc.

The present invention solves the drawbacks of the conventional electromagnetic retarder cooling device described above, and in a new electromagnetic retarder, the heat generating part itself can be directly cooled by a cooling method different from that of the engine cooling system. It is also an object of the present invention to provide a cooling device that is small in size and has a high cooling capacity, and can perform cooling by selecting a cooling medium with an optimum cooling capacity.

In the present invention, the short-circuit ring of the retarder unit fixed to the flywheel housing is formed by an annular pipe, and the pipe includes a pump for circulating a cooling medium, a cooler for cooling the cooling medium, and a cooling medium for cooling the cooling medium. It is characterized in that the means for controlling the flow rate is provided separately from the engine cooling system.

Note that the cooling medium is preferably water or oil.

Further, it is preferable that the pump is configured to be driven by a crankshaft of the engine or an electric motor provided independently of the engine.

Furthermore, it is preferable that the means for controlling the flow rate of the cooling medium is configured to be interlocked with the operation of the retarder.

Embodiments of the present invention will be described in detail below based on the drawings.

FIG. 1 is a block diagram of a cooling device according to a first embodiment of the present invention. In Figure 1, engine 1 and transmission 2
A magnetic flywheel 5 is rotatably attached to the crankshaft 3 between the two. A plurality of magnetic teeth 6 are formed on the outer peripheral surface of the flywheel 5. A retarder unit 9 is attached to the upper and lower parts of the housing 7 of the flywheel 5. This flywheel 5 acts as a retarder rotor, and the retarder unit 9 acts as a field that excites the magnetic teeth 6 of this flywheel 5.

FIG. 2 is an enlarged perspective view of the retarder unit 9. In FIG. 2, the retarder unit 9 includes a magnetic prismatic core 10 and a magnetic prismatic core 10.
The coil winding frame 13 is fitted onto the body of the iron core 10 and around which the excitation coil 11 is wound, and the short-circuit ring 14 is fitted onto the tip of the iron core 10. The tip of the iron core 10 is provided close to the magnetic teeth 6, and when a current is applied to the excitation coil 11 when the iron core 10 faces the magnetic teeth 6, the opposing magnetic teeth 6 are excited and magnetized.

Four bolt holes are drilled at the base end of this iron core 10, and the iron core 10 is screwed onto the housing 7 with four magnetic bolts 15. Also, short circuit ring 14
is a hollow conductive pipe 16 and this conductive pipe 1
6 and are provided with an inflow pipe 18 and an outflow pipe 19 for circulating a cooling medium, which will be described later, within the conductive pipe 16. Further, on the surface of the housing 7, electric terminals 21 and 22 of the excitation coil 11 are provided.

Returning to FIG. 1, a water pump 23 is connected to the front end of the crankshaft 3 of the engine 1 by a belt 25. As shown in FIG. The suction side of this water pump 23 is connected via a pipe 26 to a tank 27 storing cooling water, and the discharge side is connected via a pipe 29 to a control valve 3.
Connected to 0. This control valve 30 is interlocked with a retarder switch (not shown), and when the retarder switch is on, it sends water flowing from the pipe 29 to the inflow pipe 18 of the retarder unit 9 via the retarder cooling pipe 31. When the retarder switch is in the OFF state, water flowing from the pipe 29 is passed through the bypass pipe 33 to the tank 2.
Return it to 7.

Furthermore, the outflow pipe 19 of the retarder unit 9 is
It is connected to a radiator 34 provided separately from the cooling system of the engine 1. The water cooled by the radiator 34 is returned to the tank 27 via the return pipe 35.
will be returned to.

With this configuration, a retarder switch (not shown) is turned on, and the excitation coil 11 of the retarder unit 9 is turned on.
When a current is applied to the iron core 10 through the electric terminals 21 and 22, magnetic lines of force are generated in the iron core 10. At this time, if the flywheel 5 is rotating and the magnetic teeth 6 are moving, the lines of magnetic force in the iron core 10 will change and a current will be generated, and this current will flow through the conductive pipe 1 of the short circuit ring 14.
6 to convert mechanical energy into thermal energy.

Therefore, the conductive pipe 16 generates heat, but since the control valve 30 is opened to communicate the pipe 29 and the retarder cooling pipe 31, the water pump 2 is connected to the retarder cooling pipe 31 and the inflow pipe 18.
3, cooling water is sent from the tank 27,
This conductive pipe 16 is cooled. The water used for cooling passes through the outflow pipe 19 to the radiator 34.
After being cooled down, it is returned to the tank 27 through the return pipe 35.

Also, if the retarder switch is turned off, the control valve 3
0 is switched so that the pipe 29 and the bypass pipe 33 communicate with each other, so that the water sent from the water pump 23 is returned to the tank 27 and is no longer sent to the retarder unit 9.

FIG. 3 is a block diagram of a cooling device according to a second embodiment of the present invention. In FIG. 3, each symbol corresponds to each symbol in FIG. 1, respectively.

The characteristic configuration of this embodiment is that oil is stored in the tank 27 as a cooling medium, and this oil is used to drive the motor 37.
The oil is sent to the retarder cooling pipe 31 by an oil pump 38 driven by an oil pump 38, and this motor 37 is configured to operate in conjunction with a retarder switch (not shown).

FIG. 4 is a block diagram of an electric circuit including the motor 37 and the excitation coil 11 of the retarder unit 9. In FIG. 4, one end of the vehicle's power source 39 is connected to one end of the key switch 41 of the engine 1,
The other end of the key switch 41 is connected to a load 42 of the vehicle and one end of a pump switch 43, respectively. The other end of the pump switch 43 is connected to the motor 37 and one end of the retarder switch 45, respectively.

This pump switch 43 is the retarder switch 4
This is a delay release type switch that opens the circuit with a predetermined time delay when turned off. The pump switch 43 and retarder switch 45 are arranged in the same position as other switches in the driver's seat so that the driver can easily operate them while the vehicle is running. The other end of the retarder switch 45 is connected to one end of the excitation coil 11 of a plurality of retarder units 9. Also, power supply 39, load 42, motor 3
7 and the other ends of the plurality of excitation coils 11 are grounded.

With this configuration, when the key switch 41 is turned on and the retarder switch 45 is turned on, the pump switch 43 is simultaneously turned on and current is applied to the excitation coil 11. At this time, the conductive pipe 16 generates heat as described above, but the oil pump 38 sends cooling oil from the tank 27 to the retarder cooling pipe 31 and the inflow pipe 18 by driving the motor 37, and the conductive pipe 16 is cooled. The oil used for cooling is
It is cooled and returned to the tank 27 through the same route as in the first embodiment.

Furthermore, if the retarder switch 45 is turned off, the conductive pipe 16 of the retarder unit 9 will no longer generate heat, but the pump switch 43 will be turned off for a predetermined period of time (for example, 1 hour).
It stays on (for minutes) and then turns off. As a result, the heat remaining in the conductive pipe 16 is cooled down.

In the above example, oil and water are used as the cooling medium, but a mixture of an organic liquid and the above liquid may also be used.

Furthermore, although an example has been shown in which the control valve 30 and motor 37 are controlled by turning on and off the retarder switch, they may be configured to be controlled by the temperature of the retarder unit.

Furthermore, retarder switches are provided in accordance with the number of retarder units, and the control valve 30 or motor 37 is controlled in accordance with the number of retarder switches in the on state, so that the circulation speed of the cooling medium is controlled in proportion to the braking force of the retarder. It can also be configured to increase.

As described above, according to the present invention, the cooling medium of a cooling system other than the engine cooling system is circulated within the short circuit ring of the retarder unit, which is the heat generating part of the retarder. It is possible to select the optimal cooling medium for cooling the retarder without weakening the cooling capacity of the cooling system, and the heat generating part itself can be directly cooled, resulting in a high cooling effect and a small device with excellent cooling performance. .

In particular, by configuring the retarder switch and the pump for circulating the coolant in conjunction with each other, it is possible to prevent excessive cooling.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram of a cooling device according to a first embodiment of the present invention. FIG. 2 is an enlarged external perspective view of the retarder unit. FIG. 3 is a configuration diagram of a cooling device according to a second embodiment of the present invention. FIG. 4 is a diagram showing the electric circuit configuration of the cooling device. 1...Engine, 2...Transmission, 3...Crankshaft,
5... Flywheel, 6... Magnetic teeth, 7... Housing, 9... Retarder unit, 10... Iron core,
DESCRIPTION OF SYMBOLS 11... Excitation coil, 13... Coil winding frame, 14... Short circuit ring, 15... Volt, 16... Conductive pipe, 18...
Inflow pipe, 19...Outflow pipe, 21, 22...Electric terminal, 23...Water pump, 25...Belt, 26...
Pipe, 27...tank, 29...pipe, 30...control valve, 31...retarder cooling pipe, 33...bypass pipe, 34...radiator, 35...return pipe, 37...motor, 38...oil pump, 39...power supply, 41... Key switch, 42...Load, 43...Pump switch, 45...Retarder switch.

Claims (1)

[Claims] 1. A magnetic retarder rotor with teeth formed on its surface is rotatably mounted on the crankshaft between the engine and the transmission, the base end is fixed to the housing of the flywheel, and the tip is attached to the teeth. a power supply comprising a magnetic body provided close to the body and having a first coil wound around the body as a field, a power source including a control means for applying a variable excitation current to the first coil; and a tip of the magnetic body. a second coil wound nearby, the second coil being a short-circuit ring formed at least in part by a hollow pipe in which the cooling medium circulates; The engine includes a pump that circulates a medium, a cooler that cools the coolant that has circulated in the pipe, a tank that stores the cooled coolant, a means for controlling the flow rate of the coolant, and a pipe for the coolant. A retarder cooling device characterized in that it is provided separately from the cooling system of the retarder. 2. The retarder cooling device according to claim 1, wherein the cooling medium is water or oil. 3. The retarder cooling device according to claim 1 or 2, wherein the pump is driven by the crankshaft of the engine. 4. The retarder cooling device according to claim 1 or 2, wherein the pump is driven by an electric motor. 5. The retarder cooling device according to any one of claims 1 to 4, wherein the means for controlling the flow rate of the cooling medium includes means for interlocking with the operation of the retarder.