JPH0518262U - Eddy current reducer rotor - Google Patents

Abstract

(57) [Summary] [Purpose] To prevent the occurrence of thermal plastic deformation when the rotor is exposed to high temperatures. [Structure] A support ring 14 around which a plurality of electromagnets 17 in which the polarities of adjacent magnets are opposite to each other are provided is provided so that the pole faces of the electromagnets are magnetically opposed to a rotor with a required gap. A plurality of supporting metal pieces 7 having a rectangular cross section are provided on the outer peripheral surface of the inner end of the inner cylinder 3 facing the outer cylinder 2 at equal intervals so that the long sides thereof extend in the circumferential direction. The outer cylinder 2 and the inner cylinder 3 are connected to each other by a large number of arms 4 which are elastically supported via a rubber bush 9 and are radially arranged between the outer cylinder 2 and the support piece 8 provided on the inner end side of the arm. .. [Effect] The stress generated at the joint between the outer cylinder and the arm is reduced to within the elastic limit, and damage due to the heat effect of the rotor is prevented.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an improvement in the rotor of an eddy current type speed reducer used in large vehicles such as buses and trucks.

[0002]

[Prior Art]

 As a braking device or speed reducer for large vehicles, in addition to the foot brake, which is the main brake, and the exhaust brake, which is an auxiliary brake, stable deceleration is performed when descending a long slope, and burnout of the foot brake is prevented. An eddy current type speed reducer is used for this purpose.

The eddy current type speed reducer includes one using an electromagnet and one using a permanent magnet. The former eddy current type speed reducer uses electromagnets in which an electromagnetic coil is wound around an iron core as magnetic poles, and many of the magnetic poles are arranged on both sides of the disk. A torque is generated in the direction of decelerating the disk by an electric current phenomenon to obtain a braking force (Japanese Patent Laid-Open No. 615774/50).

The latter eddy current type speed reducer is a magnet support ring in which a rotor is fitted to one end of a rotary shaft and a plurality of permanent magnets are provided so that adjacent magnets have opposite polarities. And a device in which the pole surface of the permanent magnet is provided in the axial direction of the rotating shaft so as to be able to advance and retreat from a position where the pole surface of the permanent magnet magnetically faces the rotor at a required gap to a position where the pole face is completely separated (Japanese Patent Laid-Open No. 234043).

The temperature of the rotor of the eddy current type speed reducer rapidly rises with the generation of the eddy current, and reaches a high temperature of 600 ° C. or higher depending on usage conditions. Therefore, it is necessary to make the heat capacity and rigidity of the device sufficiently large so that the rotor is not deformed by the influence of heat, which inevitably increases the weight of the device.

On the other hand, in order to improve the performance of the vehicle, the weight and simplification of the device have been attempted. As a result, the heat capacity of the rotor of the eddy current type speed reducer decreases, and the rigidity also decreases, so deformation due to thermal effects due to temperature rise is becoming a problem. That is, when the rotor is exposed to a high temperature and its temperature rises, a high stress distribution is generated in the vicinity of the joint between the outer cylinder of the rotor and the support arm, and plastic deformation may occur in the outer cylinder of the rotor.

[0007]

[Problems to be solved by the device]

 As described above, the conventional eddy current type speed reducer has a problem that thermal plastic deformation occurs when the temperature of the rotor rises. In order to prevent the above-mentioned thermal plastic deformation from occurring, the present invention prevents the rotor outer cylinder from being exposed to high temperature and expanding and deforming so that the stress distribution state at the joint between the outer cylinder of the rotor and the support arm can be kept constant. The object is to provide a rotor for an eddy current type speed reducer in which the outer cylinder part is stopped within the elastic limit.

[0008]

[Means for Solving the Problems]

 In order to achieve the above object, a rotor of an eddy current type speed reducer using an electromagnet of the present invention has a rotor formed by forming an outer cylinder and an inner cylinder into a rotor at one end of a rotary shaft and is adjacent to the rotor. In an eddy current type speed reducer in which a support ring around which a plurality of electromagnets are provided so that the polarities of the magnets are opposite to each other is provided so that the pole faces of the electromagnets are magnetically opposed to the rotor with a required gap, the inner cylinder A plurality of supporting metal pieces having a rectangular cross section are provided on the outer peripheral surface at equal intervals with their long sides oriented in the circumferential direction, and elastically supported by rubber bushes between the both side surfaces of the supporting metal pieces. The ends of the outer and inner cylinders are connected by a large number of radially arranged arms.

[0009]

[Action]

 The outer cylinder and the inner cylinder that form the cylindrical portion of the rotor are connected to the inner cylinder by an arm elastically supported by a pair of rubber bushes oriented in the circumferential direction. Even if the tubular part becomes hot and expands and deforms due to heat, the arm follows the deformation and expands and contracts against the shearing force of the rubber bush. Therefore, it is possible to prevent the plastic deformation of the outer cylindrical portion of the rotor. Also, since it is possible to absorb the shock torque in the rotation direction due to the braking on / off switching operation, the shock at that time is not transmitted to the vehicle, and smooth braking can be obtained.

[0010]

【Example】

 Embodiment 1 An embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a sectional view of the entire apparatus, FIG. 2 is a side view showing one half portion, and FIGS. 3 and 4 are partially enlarged views showing details of an arm joint portion. The mounting disk 6 of the rotor 1 is attached to the support member 12 fitted to one end of the rotary shaft 11 with a plurality of bolts 19.

In the rotor 1, the outer cylinder 2 and the inner cylinder 3 are opposed to each other with a required space to form a cylindrical portion, and the outer end of the inner cylinder 3 is elastically supported via a rubber bush 9 and arranged radially. The outer cylinder 2 and the inner cylinder 3 are connected to each other by means of the arm 4, and a large number of cooling fins 5 are arranged on the outer peripheral surface of the outer cylinder 2 and the mounting plate is attached to the inner end of the inner cylinder 3. 6 is provided.

As shown in detail in FIGS. 3 and 4, the support portion between the arm 4 and the inner cylinder 3 is a pair of support pieces 8 provided at the inner end portion of the arm 4 and a support provided on the inner cylinder 3. A pair of rubber bushes 9 are interposed between the metal 7 and the armature 4 so that when the outer cylinder 2 is thermally expanded, the arm 4 is pulled out to the outer cylinder 2 side against the shearing force of the rubber bush 9. .

In the space between the outer cylinder 2 and the inner cylinder 3, a support ring 14 is formed on the outer periphery of a support member 13 axially supported by the rotary shaft 11 via a bearing 18, and the support ring 14 is On the outer peripheral surface, a plurality of electromagnets 17 each having an electromagnetic coil 16 wound around an iron core 15 are circumferentially provided so that the magnetic poles of adjacent electromagnets are opposite to each other. The electromagnet 17 is configured to generate a magnetic field when energized by a battery power source.

The speed reducer is used, for example, by attaching a mounting bracket (not shown) provided on the support member 13 to the vehicle body and connecting the rotating shaft 11 to the propeller shaft.

When the electromagnet 17 is saving power, the rotor 1 is rotating with a predetermined torque, and is in a so-called braking off state.

When the electromagnet 17 is energized in this braking-off state, a magnetic circuit is formed between the adjacent electromagnet 17 and the outer cylinder 2 of the rotor, and an eddy current flows in the outer cylinder 2, so-called braking The vehicle is turned on, braking torque is generated, and the vehicle is greatly decelerated.

When the above braking operation is repeated, the amount of heat generated by the eddy current is accumulated, so that the outer cylinder 2 of the rotor becomes extremely hot depending on the usage conditions. At this time, the arm 4 resists the shearing force of the rubber bush 9 and is pulled along with the deformation of the outer cylinder 2. As a result, it is possible to reduce the stress generation in the vicinity of the joint between the outer cylinder 2 and the arm 4 and keep it within the elastic limit.

[0018]

[Effect of the device]

 In the rotor of the eddy current type speed reducer of the present invention, the outer cylinder forming the cylindrical portion of the rotor and the inner cylinder are connected by an arm elastically supported by a rubber bush so that the outer cylinder is not deformed by thermal expansion. Is configured to be pulled out following, and the stress generated at the joint between the outer cylinder and the arm can be reduced to within the elastic limit, and damage due to the thermal effect of the rotor can be prevented. it can.

[Brief description of drawings]

FIG. 1 is a sectional view of an eddy current type speed reducer using an electromagnet according to an embodiment of the present invention.

FIG. 2 is a front view showing a half portion of the rotor in FIG.

FIG. 3 is an enlarged sectional view showing details of an arm portion in FIG.

4 is a cross-sectional view taken along the line AA of FIG.

[Explanation of symbols] 1 rotor 2 outer cylinder 3 inner cylinder 4 arm 5 cooling fin 6 mounting disk 7 support metal 8 support piece 9 rubber bush 10 pole piece 11 rotating shaft 12 support member 13 support member 14 support ring 15 iron core 16 electromagnetic Coil 17 Electromagnet 18 Bearing 19 Volt

Claims (1)

[Scope of utility model registration request] 1. A support in which a rotor in which a cylindrical portion is formed from an outer cylinder and an inner cylinder is fitted to one end of a rotating shaft, and a plurality of electromagnets are circumferentially arranged so that the polarities of adjacent magnets are opposite to each other. In an eddy current type speed reducer in which the pole surface of the electromagnet is magnetically opposed to the rotor with a required air gap, a plurality of supporting metal objects having a rectangular cross section are formed on the outer peripheral surface of the inner end of the inner cylinder, Tube ends of the outer cylinder and the inner cylinder are projected by equal intervals in the circumferential direction, and are elastically supported by rubber arms between each side surface of the support metal and radially arranged by a large number of arms. The rotor of the eddy current type speed reducer connecting the two.