JPS62178154A - Automobile retarder - Google Patents

Abstract

PURPOSE:To generate a high braking force by sealing magnetic powder between a stator and a rotor and lessening an air gap with said magnetic powder. CONSTITUTION:A stator of an inductor-type generator is accommodated in a case 8 provided in a housing 2. This stator is furnished with a plurality of pole cores 9 arranged in the circumferential direction of a flywheel and is opposed to an inductor pole 7 through air gap and its upper end is fastened to a cover plate of the case 8 through a stator yoke 10. An armature coil 11 and a field coil 12 are respectively wound around this pole core 9. At the same time, magnetic powder 25 is sealed between the rotor and the stator to lessen a gap between the tip of the pole core 9 and the inductor pole 7 on the rotor side. In this manner, the magnetic reluctance of magnetic circuits 35, 36 is diminished and the magnetic flux is centered at said circuits so that a high braking force may be generated.

Description

[Detailed description of the invention]

ζ INDUSTRIAL APPLICATION FIELD The present invention relates to an automobile retarder, and more particularly to an automobile retarder in which a rotor is rotated relative to a stator and a braking force is generated by the action of an electric current 14i between the two. KSummary of the invention] The present invention includes magnetic powder sealed between a stator and a rotor,
The present invention relates to a retarder in which the air gap is made small using the magnetic powder, thereby generating a high braking force. K PRIOR ART In order to supplement the braking force of service brakes or engine brakes, attempts have been made to equip automobiles with retarders. By connecting an eddy current type retarder or a generator type retarder to the engine or power line,
This retarder provides braking force as needed. Such a retarder is composed of a stator and a rotor, and generates braking force by rotating the rotor relative to the excited stator. Problems to be Solved by the K Invention This kind of retarder generates braking force by electric force, and the braking force depends on the air gap between the D-tor and the stator. Become. Therefore, in order to strengthen the braking force, it is necessary to reduce the air gap and reduce the magnetic resistance of the magnetic circuit. However, it is necessary to set the air gap to a value that will prevent the rotor and stator from interfering with each other even if the rotor bearing wears out, and for this reason, the air gap cannot be made very small. That is, since the braking force was generated by a retarder having a relatively large air gap, there was a drawback that a high braking force could not be obtained. The present invention has been made in view of these problems, and is a great example of this invention! To provide an automobile retarder in which the air gap becomes extremely small at 41 hours, and the large air gap can be reduced by 1+J at non-moving U4i hours, thereby preventing interference between the stator and rotor. The purpose is to Means for Solving the K Problem The present invention provides a retarder in which a rotor is rotated relative to a stator and braking force is generated by electromagnetic action between the stator and the rotor. Magnetic powder is sealed in between, and this magnetic powder reduces the air gap. K effect Σ Therefore, according to the present invention, the air gap during excitation can be made extremely small using the magnetic powder, thereby making it possible to generate a high braking force.

【Example】

The present invention will be explained below with reference to one embodiment shown in the drawings. FIG. 3 shows an engine 1 equipped with a retarder according to an embodiment of the present invention, and this engine 1 is composed of, for example, a diesel engine for a truck. On the back side of this engine 1 is a flywheel housing 2.
is provided. A stator case 8 of an inductor type generator, which will be described later, is attached to the upper and lower sides of the housing 2. Further, a transmission 5 is disposed on the back side of the flywheel housing 2, and is configured to change the rotational speed of the engine 1 to an appropriate speed and transmit it to the driving wheels via a propeller shaft 6. Next, the structure of the retarder installed in this engine 1 will be described. As shown in Fig. 4, the housing 2
Inductor magnetic poles 7 are provided at a predetermined pitch along the circumferential direction on the outer circumferential surface of a flywheel 4 housed within the crankshaft 3 and fixed to the end of the crankshaft 3. The flywheel 4 provided with the magnetic poles 7 constitutes a rotor of an inductor type generator, and this generator constitutes a retarder of an automobile. Cases 8 are provided at the top and bottom of the housing 2, respectively, and the stator of the inductor type generator is housed in these cases 8. As shown in FIG. 1, this stator includes a plurality of pole cores 9 arranged in the circumferential direction of the flywheel 4. The lower end of the pole core 9 faces the inductor magnetic pole 7 via an air gap, and the upper end thereof is fixed to the case 8 via a stator yoke 10. The pole core 9 has an armature coil 11 and a field coil 1.
2 are equipped with each. J5 armature coil 1
1 is wound across two pole cores 9, whereas one field coil 12 is wound around each pole core 9. The field coil 12 on the stator side having such a configuration is the fourth
It is connected to a battery 14 via a controller 13 shown in the figure. The controller 13 that controls the field current to the field coil 12 is equipped with a relay switch 16, as shown in FIG. 3, and the opening and closing of this relay switch 16 is controlled by the relay coils 1-7. ing. The relay coil 17 is connected to a drive circuit 18, and the drive circuit 18 is connected to a retarder switch 19 provided at the driver's seat. On the other hand, the armature coil 11 is connected to a load resistor 15. Briefly, in the retarder according to this embodiment, as shown in FIGS. 1 and 2, magnetic powder 25 is enclosed between the rotor and the stator. That is, as shown in FIG. 1, magnetic powder 25 is sealed so as to adhere to the tip of the pole core 9 on the stator side, and this magnetic powder 25 causes the tip of the pole core 9 to connect with the inductor magnetic pole 7 on the rotor side. I try to keep the gap between them small. Note that this magnetic powder may be composed of powder of a suitable magnetic material, such as iron powder. Next, the operation of this automobile retarder constructed as shown below will be explained. For example, when a car equipped with this retarder goes down a long slope, the retarder switch 19 provided at the driver's seat is turned on. Then, the drive circuit 18 of the controller 13 shown in FIGS. 3 and 4 is activated, and the relay coil 17 is energized. Therefore, the relay switch 16 comes to close, and a field current flows from the battery 14 to the field coil 12 of the stator of the inductor generator via this relay switch 16, and this field coil 12 is excited. become. When the field coil 12 is excited in this way, the field 14) coil 12 magnetizes the ball cores 9 two by two in opposite directions, and the common armature coil 11 A pair of wound ball cores 9 are magnetized to have different polarities. Therefore, at a certain moment, a magnetic circuit 35 as shown by the dotted line in FIG. Then, a magnetic circuit 3G as shown by the chain line in FIG. 3 is formed. The magnetic fluxes passing through these magnetic circuits 35 and 36 both interlink with the armature coil 11, and the two magnetic circuits 3
The directions of the magnetic fluxes passing through 5.36 will be reversed. Therefore, due to this change in magnetic flux, the armature coil 11
An electromotive force is induced, and this inductor type generator generates electricity. This means that the engine 1 or the vehicle drives the flywheel 4, and the work done from the outside at this time is absorbed as braking force. Therefore, the vehicle is subjected to braking force by the electric power generated by the inductor type generator, and the vehicle is decelerated. The generated output at this time is consumed by the load resistor 15 shown in FIGS. 3 and 4. Further, in the retarder according to the present embodiment, as described above, magnetic powder 25 is sealed between the inductor magnetic pole 7 on the rotor side and the ball core 9 on the stator side, and the magnetic powder 25 causes air to flow. I'm trying to close the gap. That is, when the ball core 9 is excited by the field coil 12 as shown in FIG. The powder 25 closes the gap between the tip of the ball core 9 and the pole 7 of the inductor 11. Therefore, the air gap becomes substantially very small, which reduces the reluctance of the magnetic circuit 35.36 and causes a concentration of magnetic flux in the magnetic circuit 35.36. Therefore, this prevents leakage of magnetic flux and makes it possible to generate high braking force. Note that when the excitation of the ball core 9 by the field coil 12 is released, the magnetic powder 25 comes to adhere to the outer circumferential side of the inductor magnetic pole 7 and the surface of the ball core 9, as shown in FIG. The area to which the powder 25 adheres becomes wider. This creates a large air gap between the stator and the rotor, which prevents interference between the stator and the rotor. Therefore, even if the bearing on the rotor side wears out, interference between the rotor and the stator is prevented. The present invention is not limited to the above-mentioned embodiments, and various modifications can be made based on the technical idea of the present invention.For example, the above-mentioned embodiments relate to a retarder made of an inductor type generator, but the present invention is not limited to the embodiments described above. The invention is also applicable to various other electromagnetic retarders, such as eddy current retarders. Effects of the invention Σ As described above, the present invention seals magnetic powder between the stator and the rotor, and The air gap is made smaller by the powder.Therefore, with this configuration, the small air gap reduces the magnetic resistance and creates a white retarder that can generate high braking force. 1;?Be able to serve.

[Brief explanation of drawings]

Fig. 1 is an enlarged front view of the main parts of an automobile retarder according to an embodiment of the present invention, Fig. 7j The main part side view and FIG. 4 are external perspective views of the same Cuda. In the symbols used in the drawings, 2... Flywheel housing 4... Flywheel 7... Inductor magnetic pole 9... Ball core 10... Stator yoke 11... Armature coil coil 2. ...Field coil 25... is magnetic powder.

Claims (1)

[Claims] In a retarder that rotates a rotor relative to a stator and generates braking force through electromagnetic action between the two, magnetic powder is sealed between the stator and the rotor, and the magnetic powder reduces the air gap. An automobile retarder characterized by: