JPH0654517A - Retarder - Google Patents

Abstract

PURPOSE:To downsize a retarder by directly coupling the rotary shaft of a retarder with the crank shaft of an engine, and also, using a material relatively high in resistivity for a vortex plate. CONSTITUTION:A retarder 10 is speeded up by directly coupling it with a crank shaft 20 or coupling it through a speed increase/reduction mechanism to the crank shaft 20 or a propeller shaft 50. Hereupon, the retarder is provided with torque property suitable for the regular number of revolutions of the retarder by forming a vortex plate, using a material high in resistivity, or making it in stratified structure so as to raise the resistivity of the vortex plate. Hereby, the retarder can be downsized and also efficient use can be materialized.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vortex plate that rotates by rotating a magnetic pole having N poles and S poles alternately arranged and a vortex plate provided at a position facing the magnetic pole. The present invention relates to miniaturization of a retarder configured to generate an eddy current and obtain a braking torque.

[0002]

2. Description of the Related Art FIGS. 5 and 6 are sectional views of conventional retarders. As shown in FIGS. 5 and 6, a conventional retarder that obtains a braking torque by using an eddy current has a coil 4 attached to a stator core 2 fixed to a stay (not shown).
-I is wound to form the magnetic pole 3-i. The swirl plate 1 has a shape surrounding all the magnetic poles 3-i and is fixed to the shaft 5. Needless to say, the shaft 5 and the stator core 2 are rotatable.

When the coil 4-i is energized, the magnetic pole 3-i of the stator core 2 is alternately magnetized to the N and S poles, and an eddy current is generated in the rotating vortex plate 1, and the eddy current and the coil 4-i are generated.
An electromagnetic force in a direction opposite to the rotating direction of the vortex plate 1 is generated between the magnetic field of i and the rotating force of the vortex plate 1, which exerts a braking action. At this time, the vortex plate 1 generates heat due to eddy current loss.

FIG. 7 shows an example of a conventional retarder installation. Figure 7
As shown in FIG. 3, the retarder has been conventionally attached to a portion having a relatively small rotational speed such as the propeller shaft 50. In FIG. 7, reference numeral 10 is a retarder, 30 is an engine, 40 is a speed change mechanism, and 50 is a propeller shaft. The rotational force generated by the engine 30 is transferred to the speed change mechanism 40.
Thus, the vehicle is decelerated and transmitted to the tire via the propeller shaft 50. The retarder 10 is arranged to apply a braking force to the propeller shaft 50.

[0005]

However, in this case, since the retarder is required to generate a high torque at a low speed rotation, the retarder has to be increased in size. Moreover, it was necessary to select a high conductivity material for the swirl plate 1.

An object of the present invention is to reduce the size of the retarder.

[0007]

SUMMARY OF THE INVENTION According to the present invention, a rotating shaft of a retarder is directly connected to a crankshaft of an engine, or the rotating shaft is connected to a crankshaft of an engine or a propeller shaft of a vehicle through a speed increasing mechanism. In addition, the specific resistance of the vortex plate is increased as compared with the conventional one, if necessary.

[0008]

The rotation speed of the retarder is increased by the above means. Further, the torque characteristic of the retarder can be changed by changing the resistance value of the swirl plate, that is, the torque in the rotation speed range where the retarder is used can be improved without changing the size of the retarder.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows an example (1) of the retarder arrangement of the present invention. In FIG. 1, reference numeral 10 is a retarder, 20 is a crankshaft, 30 is an engine, 40 is a speed change mechanism, and 50 is a propeller shaft. In the arrangement example, the retarder 1
The number 0 is directly connected to the crankshaft 20 so that the speed is increased as compared with the conventional case. FIG. 2 shows a retarder arrangement example (2) of the present invention. In FIG. 2, reference numeral 10 is a retarder, 5
Reference numeral 0 represents a propeller shaft, and 60 represents a speed increasing mechanism. In the arrangement example, the retarder 10 includes the pinion gear 61 and the gear 6
Propeller shaft 5 via a speed increasing mechanism 60 composed of
By combining with 0, the speed is increased as compared with the conventional one. Further, even if the retarder 10 is connected to the crankshaft 20 of the engine through the speed increasing mechanism, the retarder 1 is also similarly connected.
0 can be speeded up.

FIG. 3 shows the torque characteristic of the retarder. As the curve a shows, the torque of the retarder rises as the rotation speed increases, but it shows a peak at a certain rotation speed,
When the number of rotations increases more than that, the torque decreases.
Therefore, by providing the retarder with a torque characteristic suitable for the normal rotation speed of the retarder, the retarder can be used efficiently, and the retarder can be downsized.

By the way, when the speed of the retarder is increased as shown in FIGS. 1 and 2, the normal rotation speed of the retarder is increased. For example, if the retarder used in the rotational speed range indicated by R1 in FIG. 3 is speeded up three times, it will be used in the rotational speed range indicated by R2. For example, the retarder having the torque characteristic indicated by the curve a efficiently generates torque in the rotation speed range R1, but does not efficiently generate torque in the rotation speed range R2 that exceeds the torque peak. Therefore, it is desired to use a retarder having the torque characteristic shown by the curve b. Therefore, in the present invention, the torque characteristic of the retarder is changed by increasing the specific resistance of the swirl plate. Specifically, when the specific resistance of the swirl plate is increased, the torque peak moves to the high rotation side as shown in FIG. The following methods are available to increase the specific resistance of the vortex plate. (1) A material having a high specific resistance is used for the swirl plate. For example,
If the swirl plate is formed using a material having a high specific resistance such as an Fe-Cr alloy, the specific resistance of the swirl plate naturally increases. (2) Increase the apparent specific resistance of the vortex plate. FIG. 4 shows an example of the structure of the swirl plate. The vortex plate 1 is attached to the vortex plate layers 1-1 to 1
By using the layered structure of -6, the apparent specific resistance can be increased.

With these methods, it is possible to obtain a desired torque characteristic by moving the torque peak to the normal rotation speed range of the retarder. In the present embodiment, the vortex flow plate has a cylindrical shape for explanation, but the present invention is not limited to the cylindrical vortex flow plate and can be applied to a disk-shaped vortex flow plate.

[0013]

As described above, according to the present invention, the retarder can be downsized by increasing the speed of the retarder and changing the specific resistance of the swirl plate to obtain a desired torque characteristic.

[Brief description of drawings]

FIG. 1 shows a retarder arrangement example (1) of the present invention.

FIG. 2 shows a retarder arrangement example (2) of the present invention.

FIG. 3 shows a torque characteristic of a retarder.

FIG. 4 shows a configuration example of a vortex plate.

FIG. 5 is a sectional view of a conventional retarder.

FIG. 6 is a sectional view of a conventional retarder.

FIG. 7 shows a conventional retarder installation example.

[Explanation of symbols]

 1 Vortex Plate 2 Stator Core 3 Magnetic Pole 4 Coil 5 Shaft 10 Retarder 20 Crankshaft 30 Engine 40 Transmission Mechanism 50 Propeller Shaft 60 Speed-up Mechanism

Claims (4)

[Claims] 1. A magnetic pole in which N poles and S poles are alternately arranged.
(3) and the vortex plate (1) provided at a position facing the magnetic pole (3) are relatively rotated to generate an eddy current in the vortex plate (1) to obtain a braking torque. In the retarder, set the rotation axis of the retarder to the crankshaft (2
A retarder characterized by being directly connected to (0) and using a material with a relatively high specific resistance for the swirl plate (1). 2. A magnetic pole in which N poles and S poles are alternately arranged.
(3) and the vortex plate (1) provided at a position facing the magnetic pole (3) are relatively rotated to generate an eddy current in the vortex plate (1) to obtain a braking torque. In the retarder, the rotation shaft of the retarder is connected to the crankshaft (20) of the engine or the propeller shaft (50) of the vehicle through the speed increasing mechanism, and the swirl plate (1) is made of a material having a relatively high specific resistance. A retarder that is characterized by what it was. 3. A magnetic pole in which N poles and S poles are alternately arranged.
(3) and the vortex plate (1) provided at a position facing the magnetic pole (3) are relatively rotated to generate an eddy current in the vortex plate (1) to obtain a braking torque. In the retarder, set the rotation axis of the retarder to the crankshaft (2
A retarder that is directly connected to (0) and has a layered structure in which the swirl plate (1) is formed by stacking multiple donut-shaped swirl plates. 4. A magnetic pole in which N poles and S poles are alternately arranged.
(3) and the vortex plate (1) provided at a position facing the magnetic pole (3) are relatively rotated to generate an eddy current in the vortex plate (1) to obtain a braking torque. In the retarder, the rotation shaft of the retarder is connected to the crankshaft (20) of the engine or the propeller shaft (50) of the vehicle through the speed increasing mechanism, and the swirl plate (1) is overlaid with a plurality of donut-shaped swirl plates. Retarder characterized by a stratified structure.