JPH0496648A - Cooling device for electric braking device - Google Patents

Abstract

PURPOSE:To cool the rotating machine of an electrical controller within a housing appropriately by providing a finned heat pipe in a protruding state outside a housing nearest to a stator part coil. CONSTITUTION:A hole 2a is bored through the outer peripheral part of a flywheel housing 2 and a hole 11a is formed in the vicinity of a stator core 11 from the outer periphery of the stator core 11 to its inside. On the other hand, a heat pipe 21, is provided where a fin 21b is attached to the heat dissipation end of a pipe 21a and the intermediate of the same pipe 11a is provided with a mounting flange 21c. The heating end of this heat pipe 21 is inserted from the outside of the housing 2 through the hole 2a into the inside of the housing and then into the hole 11a of the stator core 11. Also, the fin 21b of the heat pipe 21 is provided in a protruding state outside the housing 2. These heat pipes 21 are arranged radially on the circumference of the stator core 11. Thus, the rotating machine of an electrical controller to be accommodated within a sealed housing can be cooled satisfactorily.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention relates to an electric braking device that is installed between a vehicle engine flywheel and its housing and that performs an electrical braking action. Regarding a cooling device.

[Prior Art] Conventionally, as a braking device for a vehicle, an electric braking device called a "retarder" is known. In other words, this "retarder" is a braking device that uses electromagnetic force to conduct electromagnetic waves. This is an eddy current electric braking device that electrically suppresses the rotation of the system (
For example, see Japanese Patent Publication No. 63-198777).

Generally, the kinetic energy during braking in an electric braking device with such a structure is simply converted into thermal energy and released into the atmosphere. Attempts have been made to use them as generators and induction machines to convert kinetic energy during braking into electrical energy and recover it in a battery, and to utilize the recovered electrical energy to drive various auxiliary machines. In addition, the electric braking device (retarder) for vehicles is not only used for braking the vehicle, but also for braking the vehicle.
It goes without saying that the system is also being considered for use in various controls on the engine side.

By the way, the rotating machine of the electric braking system (retarder) for vehicles is configured to have a core and coil between the flywheel of the engine crankshaft and its housing to conduct electromagnetic waves, so it is difficult to use. Accompanied by large fever.

Therefore, in order to cool this rotating machine, it may be possible to open ventilation holes in the housing and introduce outside air. However, when this outside air is introduced, water and dust will also enter the housing, causing water and other particles to enter the coil. It can stick to the core and cause a short circuit, or it can stick to the core and change the magnetic resistance.

Further, as a cooling means for a starting/charging device similar to the electric braking device described above, for example, Japanese Patent Application Laid-Open No. 63-198777
There is a cooling device described in the publication. In short, in this cooling system, the armature core and field core are attached to the engine block via brackets, and the bracket is installed between the vicinity of the windings of the armature core and the coolant circulation path of the engine block. A heat vibrator is installed that passes through the inside, and the heat of the armature winding is transferred to the coolant by the heat vibrator.

[Problems to be Solved by the Invention] By the way, the conventional cooling device described above is limited to a configuration in which the armature core etc. are integrally connected to the engine block side, so the armature part etc. are connected to the engine block side. It cannot be applied to a vehicle electric braking system in which a housing is separately constructed and covered by a housing. In addition, since this cooling system uses the engine block's coolant, it requires processing such as specially forming a coolant path and providing heat vibration insertion holes, making the structure of the engine block complicated. There are drawbacks to doing so. Furthermore, in this cooling device, since the coolant path and the armature core are adjacent to each other, there are problems such as problems such as a tendency to cause problems due to poor sealing. Furthermore, the heat dissipated into the coolant eventually results in an increase in the capacity of the heatsink, which must be dissipated further than the heatsink.

In view of these conventional problems, an object of the present invention is to provide an electric brake system that can appropriately cool the rotating machine of the electric brake system housed in a sealed housing without using engine-side coolant. You are on the verge of getting a refrigerator.

[Means for Solving the Problems] In order to achieve this object, the present invention provides a housing for housing the flywheel of an engine crankshaft in a sealed state, and a rotating part of a rotary machine capable of braking and power generation is connected to the flywheel. In an electric braking device in which a stator part is fixed to the outer periphery of the stator part and a stator part is fixed to the inside of the housing, it is proposed that a heat vibrator with fins is installed in a protruding state outside the housing nearest to the stator part coil. It is something.

[Function] According to the configuration of the present invention as described above, in a rotating machine installed between the flywheel of an engine drive system disposed in a sealed housing and the housing, braking during running is prevented. During the accompanying power generation action, the heat generated particularly in the stator section is directly cooled by the outside air and the running wind via the heat vibrator.

[Example] Hereinafter, details of an example of the present invention will be described using the drawings.

FIG. 1 shows an engine drive system equipped with an electric braking device (retarder) according to the present invention, and the engine 1 is, for example, a diesel engine. A flywheel housing 2 and a stator housing 3 are hermetically connected to the rear side of the engine via a stator ring 4. A flywheel b fixed to the crankshaft 5 of the engine 1 is housed in the flywheel housing 2 and the stator housing 3, and a clutch 7 is assembled to the flywheel 6, and this clutch 7 connects to the input shaft 8. It is connected to the transmission 9 via the transmission 9, and the high-speed power of the transmission 9 is transmitted to the driving wheels.

Inside the housing constituted by the flywheel housing 2 and the stator housing 3, a rotating machine 10 constituting the main part of the electric braking device is located between the outer circumference of the flywheel 6 and the stator ring 4. Incorporated. That is, a cylindrical stator core 11 made of a number of stacked thin steel plates is fitted into the stator ring 4, and a stator coil 12 wound with a thin conductive wire is inserted into the coil groove of the stator core 11 to form a stator section 13. .

Further, bolts 14 are provided on the outer circumference of the flywheel 6.
As a result, the rotor core 16 is fixed together with the ring 15 in a state in which the rotor core 16 is closely opposed to the inside of the stator core 11. A squirrel-cage rotor coil 17 is inserted into the coil groove of the stator core 11, and retaining rings 19 are fitted to the end rings 18 on both sides of the rotor coil 17, and the rotor portion 20
is configured. In other words, these stator parts 1
3 and the rotor section 20 constitute a squirrel cage induction machine capable of braking and power generation.

In the electric braking device described above, that is, in the rotating machine 10, the stator section 13, which is induced by alternating current, generates more heat than the rotor section 20, which is the magnetic pole. An arrangement is provided to actively cool the portion. Specifically, a hole 2a is passed through the outer circumference of the flywheel housing 2, and a hole 11a is formed near the stator core 11 from the outer circumference to the inner side of the stator core 11.

On the other hand, a heat vibrator 21 is prepared in which a fin 21b is attached to the heat radiation end of the pipe 21a, and a flange 21C is attached to the middle of the pipe 21a.

The heating end of the heat vibrator 21 is inserted into the flywheel housing 2 from the outside through the hole 2a, and then inserted into the hole 11a of the stator core 11. Since the flange 21c of the heat vibe 21 is fastened to the flywheel housing 2 with bolts 22, the fin 21b at the heat radiation end of the heat vibe 21
is projected to the outside of the flywheel housing 2. A plurality of these heat vibes 21 are arranged radially around the circumference of the stator core 11.

In the case of the illustrated embodiment, the flywheel housing 2 and stator housing 3 described above are made of aluminum with good heat conductivity, but their outer surfaces are provided with heat dissipation ribs, etc. as necessary, so that they have excellent heat dissipation. have.

FIG. 2 is an electric circuit diagram of the electric braking device described above, and 3
The stator coils 12 arranged in phases are Y-connected. That is, each phase of these stator coils 12 is connected to the input side of an inverter circuit 30 that full-wave rectifies alternating current and converts it into direct current, and the output side of the inverter circuit 30a is connected to a parallel circuit of a regulator 31 and a battery 32. be done. One of the brushes 34 in contact with the slip rings 33 at both ends of the rotor coil 17 is grounded, and the other brush 34 is connected to the battery via the field current control circuit 35.
Connected to 2. Further, signals from a brake switch 37 and a rotation sensor 39 are manually inputted to the control circuit 36, and a control signal is outputted from the switch and the rotation signal to the inverter circuit 30, the irregular time 1, and the flow control field 35. Note that the battery 32
There is no need to point out that other electrical components 38 are connected to the .

Since the electric braking device of the illustrated embodiment has the above-described structure, it is controlled as follows.

During engine operation, the crankshaft 5 of engine 1
The power of a is input to the transmission 9 via the flywheel 6, the clutch 7, and the human power shaft 8, and the shifting power of the transmission 9 is transmitted to the drive wheels, so that the vehicle runs.

When exiting the vehicle while the vehicle is running, the brake switch 37 is turned on.
Then, a current control signal is manually transmitted from the control circuit 36 to the field current control circuit 35, and the rotor coil 1 of the rotating machine 10, which is rotating integrally with the flywheel 6, is transmitted from the battery 32 to the field current control circuit 35.
A field ffl current flows through 7, and one side is magnetized to the S pole and the other to the N pole. Since the stator coil 12 crosses the lines of magnetic force of the magnetic poles, an alternating current electromotive force is generated, and an electromagnetic force is generated between the dynamic current and the magnetic poles. At this time, the control circuit 36 manually applies an opening/closing control signal to the inverter circuit 30 at a lower rotation speed than the rotor side based on the rotation signal from the sensor 39, thereby controlling the rotating magnetic field of the stator coil 12 at a low speed. Therefore, the electromagnetic force described above acts on the rotor section 20 to suppress its rotation, and the engine drive system including the flywheel 6 is accordingly braked.

On the other hand, the AC startup generated in the stator coil 12 is rectified by the inverter circuit 3o, the voltage is adjusted by the regulator 31, and the battery 32 is charged, thus converting the operating energy during deceleration of the engine drive system into electrical energy. will be collected. Of course, the power of the battery 32 will be used to drive the electrical components 38 when necessary.

By the way, when the rotating machine 10 performs braking or generates electricity, current flows through the stator coil 12 and the rotor coil 17 and generates heat, and the stator coil 12 generates a particularly large amount of heat. In the case of the illustrated embodiment, a heat vibrator 21 is installed from the stator core 11 to the flywheel housing 2, and the fins 21b at the heat radiation end of the heat vibrator 21 are in contact with the outside air, so the heat pipe 21 is exposed to the wind while the vehicle is running. It's cold to the touch. Therefore, stator coil 12
The heat is transmitted to the heating end of the heat vibrator 21 via the stator core 11, and is further radiated to the heat dissipation end of the heat vibrator 21 due to the heat conduction effect, and is directly cooled. Moreover, since the flywheel housing 2 and stator housing 3, which have good thermal conductivity, are also cooled by the outside air, the heat generated by the rotating machine 10 is reliably radiated and cooled.

It is obvious that the present invention is applicable not only to the above-mentioned rotating machine structure but also to rotating machines of other structures.

[Effects of the Invention] As explained above, according to the present invention, a finned heat vibrator is provided that reaches outside the housing from a stator portion of a rotating machine provided in a sealed housing, and a through-hole portion of the housing is provided. Since it is possible to seal between the heat pipe and the seal heat pipe, there is no fear of water or air entering from the outside, and the heat generated by the coil of the rotating machine can be effectively cooled by the outside air temperature or running wind. Since the engine is cooled using the running wind, there is no need for any special processing on the engine side, and there is no need to worry about water leaks.

Since the present invention has a configuration in which the heat vibrator is arranged radially from the stator part of the rotating machine to the outside of the housing,
It is easy to assemble, has a large degree of freedom in installation, and has the advantage of optimizing the cooling effect by adjusting the number of heat vibrators, etc.

[Brief explanation of drawings]

FIG. 1 is a partially enlarged sectional view of an electric braking device according to the present invention, and FIG. S2 is an electric circuit diagram of the electric braking device. 1... Engine, 2... Flywheel housing, 3... Stator housing, 5... Crankshaft,
6... Tarai wheel, 10... Rotating machine, 13...
- Stator section, 20... Rotor section, 21... Heat vibe. Patent applicant Hino Motors Co., Ltd.

Claims (3)

[Claims] (1) A housing is provided to house the flywheel of the engine crankshaft in a sealed state, a rotating part of a rotary machine capable of braking and power generation is fixed to the outer periphery of the flywheel, and a stator part is fixed to the inside of the housing. 1. A cooling device for an electric braking device, characterized in that a finned heat pipe is installed in a protruding state outside the housing closest to the stator section coil. (2) The heating end of the heat pipe having a fin at the heat dissipation end is inserted from outside the housing toward the vicinity of the coil inside the stator core of the stator portion, and the heat pipe is fixed to the housing from the outside. Claims (
1) A cooling device for the electric braking device described above. (3) The cooling device for an electric braking device according to claim (1), wherein the housing is made of aluminum.