JPH0680380U - Vehicle retarder - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a vehicle retarder that is small and lightweight, has improved reliability, and can be manufactured at low cost. [Structure] A cylindrical rotor 13 is fixed to the rotor 13.
A coil 16 that is a fixed portion is provided so as to surround the rotating shaft 8 that rotates together with it, and a yoke 18 through which a magnetic flux generated by the coil 16 passes is divided into first and second yokes 18a and 18b. By arranging the first and second claw portions 18c and 18d, which are portions of the two yokes 18a and 18b contacting the outer peripheral surface of the coil 16, alternately in the circumferential direction of the coil 16, the first yoke 18a, First claw portion 18c, rotor 13, second claw portion, second yoke 1
A magnetic path is formed through 8b to the first yoke 18a, and the rotation of the rotary shaft 8 is braked via the rotor 13 by an eddy current generated in the rotor 13.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a vehicle retarder.

[0002]

[Prior art]

 As shown in FIG. 4, the vehicle retarder 1 is mainly used as an auxiliary brake for the large vehicle 2 and is connected between the propeller shafts 3a and 3b in the power train system.

An example of this type of vehicle retarder 1 is shown in FIG. The vehicle retarder 1 includes a cylindrical member 5 that surrounds a rotary shaft 4 that is a drive system of a vehicle and is fixed to a vehicle body, and a plurality of coils 6 that are arranged on the outer peripheral surface of the cylindrical member 5 in the circumferential direction. a, 6b, 6c and a cylindrical rotor 7 fixed to the rotating shaft 4 such that the inner peripheral surfaces thereof face the coils 6a to 6c with a gap therebetween. That is, the rotating shaft 4 and the rotor 7 rotate integrally and serve as a rotating portion which is a braked portion, and the cylindrical member 5 and the coils 6a to 6c serve as a fixed portion fixed to the vehicle body. Thus, the magnetic flux generated by exciting the coils 6a to 6c generates an eddy current in the rotor 7 rotating integrally with the rotating shaft 4, and converts the rotational energy into heat by the eddy current to obtain a desired control. Get power.

[0004]

[Problems to be solved by the device]

 The vehicle retarder as described above is required to have the following functions. (1) Small and lightweight. (2) Low loss during normal operation. (3) Low inertia that has little effect on the powertrain system. (4) High reliability as a brake. (5) Low cost.

Some vehicle retarders according to the related art have pursued the above-mentioned functions, but further improvements in the above-mentioned functions are desired.

The present invention has been made in view of the above-described conventional art, and an object thereof is to provide a vehicle retarder which is small in size, lightweight, has improved reliability, and can be manufactured at a low cost.

[0007]

[Means for Solving the Problems]

 The structure of the present invention that achieves the above object is a cylindrical rotor that is fixed to a rotary shaft and rotates integrally with the rotation of the rotary shaft, and that is fixed to the vehicle body and occupies the inside of the rotor to prevent magnetic flux. And a coil for braking the rotation of the rotor by the eddy current generated in the rotor by this magnetic flux, in a vehicle retarder, an annular coil arranged so as to surround the rotating shaft and the left end of this coil. A first yoke having a first claw portion that abuts the surface to the upper surface and extends to the right end surface side, and a second claw portion that abuts the coil from the right end portion side to the upper surface and extends to the left end surface side. The first and second claws are alternately arranged on the outer peripheral surface of the coil so as to face the inner peripheral surface of the rotor along the circumferential direction of the coil. Surround the coil with the yoke of the And said that you have a yoke.

[0008]

[Action]

 According to the present invention having the above structure, the magnetic flux formed around the coil by exciting the coil passes through the first and second yokes. At this time, the magnetic flux emitted from the first or second pawl portion passes through the rotor and then enters the second or first pawl portion adjacent in the circumferential direction. Therefore, the first and second claws form magnetic poles in which N poles and S poles are alternately arranged in the circumferential direction of the coil. As a result, an eddy current is generated on the surface of the rotating rotor that faces these magnetic poles, and the eddy current brakes the rotating shaft via the rotor.

[0009]

【Example】

 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a vertical cross-sectional view (however, the upper half is shown) of a vehicle retarder according to an embodiment of the present invention, and FIG. 2 is a perspective view (however, the right half is shown) partially cut away. is there.

As shown in both figures, the rotary shaft 8 is rotatably supported by bearings 10 a, 10 b, 10 c fixed to the inner peripheral surface of a cylindrical housing 9. Further, tubular couplings 11 and 12 having flange portions on their end faces are fitted to both ends of the rotary shaft 8. Further, cylindrical rotors 13 and 14 are fixed to the flanges of the couplings 11 and 12 via stud bolts 15a and 15b. The rotating shaft 8, the couplings 11 and 12, and the rotors 13 and 14 form a rotating unit that rotates together. The rotating portion is connected to the propeller shafts 3a and 3b (see FIG. 4) via the stud bolts 15a and 15b.

The housing 9 is fixed to a mounting plate 17 of the vehicle body via its mounting portion 9a. In this embodiment, the tandem type in which two sets of power absorbing parts I and II are fixed to the housing 9 is used, but it is also possible to use either one, that is, the single type. These power absorption parts I and II are inside the rotors 13 and 14, respectively, and together with the housing 9 form a fixed part.

Since the power absorption units I and II have exactly the same configuration, only the power absorption unit I will be described in detail. The power absorption unit I has an annular coil 16 surrounding the rotary shaft 8. Around the coil 16, a yoke 18 composed of first and second yokes 18a and 18b is provided so as to surround the coil 16 so as to form a magnetic path through which a magnetic flux generated by the coil 16 passes. It has become. The first yoke 18a has a first claw portion 18c that abuts on the inner peripheral surface and the left end surface of the coil 16 and extends to the right end surface side while contacting the outer peripheral surface. The second yoke 18b has a second claw portion 18d that abuts on the inner peripheral surface and the right end surface of the coil 16 and extends to the left end surface side while contacting the outer peripheral surface. Thus, the first and second claw portions 18c and 18d are arranged alternately on the outer peripheral surface of the coil 16 in the circumferential direction.

The power absorption unit II also has a coil 19 and a yoke 20 in the same manner, and the yoke 20 also has a first claw portion 20c and a first yoke 20a and a second claw portion 20d. It is constituted by the second yoke 20b having.

In the above embodiment, when the coils 16 and 19 are excited, the magnetic flux Φ formed around the coils 16 and 19 causes the first yoke 18 to move as shown in FIGS. 3 (a) and 3 (b). a, 20a, the first claw portions 18c, 20c, the gap between the first claw portions 18c, 20c and the inner peripheral surfaces of the rotors 13, 14, the rotors 13, 14 and the second gap through the gaps. The claws 18d and 20d are passed through, and further, the annular magnetic path that passes through the second yokes 18b and 20b to the first yokes 18a and 20a is passed. Therefore, one of the first claw portions 18c, 20c and the second claw portions 18d, 20d is polarized as an N pole and the other as an S pole, and the N pole and the S pole are arranged in the circumferential direction of the coils 16, 19. Magnetic poles arranged alternately are formed.

In this state, an eddy current flows through the rotors 13 and 14 that rotate together with the rotating shaft 8, and the energy due to this eddy current becomes heat in the rotors 13 and 14 and is dissipated in the air. A braking force is generated by the action.

In order to generate a large eddy current, that is, in order to generate a large braking force, it is necessary to increase the change in the magnetic flux amount. In the above embodiment, however, the polarities are distributed in the circumferential directions of the coils 16 and 19. Since different magnetic poles are alternately arranged, the eddy current generation efficiency is good. Incidentally, in the case of the prior art shown in FIG. 5, a large number of coils 6a to 6c are provided for polarization, but only one coil is required in this embodiment. Further, according to this embodiment, the pole area facing the inner peripheral surfaces of the rotors 13 and 14 is the surface area of the first and second claw portions 18c, 20c, 18d and 20d, and the coil shown in FIG. A larger pole area can be secured as compared with the prior art in which the width is reduced by 6a to 6c. That is, the present embodiment can be miniaturized when compared with the same magnetic flux density.

[0018]

[Effect of device]

 According to the present invention, the following effects can be obtained as described in detail with the embodiments. (1) The size can be reduced. (2) The excitation power can be reduced for the same braking force, resulting in an energy-saving type. (3) Due to its small size, it has low inertia and has little influence on the powertrain system of the vehicle. (4) Due to its small size, the rotor diameter is reduced, resulting in low windage loss and less energy loss during non-braking. (5) The number of parts such as coils is small and the structure is simple.

[Submission date] July 7, 1993

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0012

[Correction method] Change

[Correction content]

The honing 9 is fixed to a mounting plate 17 of the vehicle body via its mounting portion 9a. The present embodiment is of a tandem type in which two sets of magnetic field generators I and II are fixedly attached to the housing 9, but any one of them, that is, a single type, may of course be used. These magnetic field generators I and II are inside the rotors 13 and 14, respectively, and together with the housing 9 form a fixed portion.

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0013

[Correction method] Change

[Correction content]

Since the magnetic field generators I and II have exactly the same structure, only the magnetic field generator I will be described in detail. The magnetic field generator I has an annular coil 16 surrounding the rotating shaft 8. Around the coil 16, a yoke 18 composed of first and second yokes 18a and 18b is provided so as to surround the coil 16 so as to form a magnetic path through which a magnetic flux generated by the coil 16 passes. It has become. The first yoke 18a has a first claw portion 18c that abuts on the inner peripheral surface and the left end surface of the coil 16 and extends to the right end surface side while contacting the outer peripheral surface. The second yoke 18b has a second claw portion 18d that abuts on the inner peripheral surface and the right end surface of the coil 16 and extends toward the left end surface while contacting the outer peripheral surface. Thus, the first and second claw portions 18c and 18d are arranged alternately on the outer peripheral surface of the coil 16 in the circumferential direction.

[Procedure 3]

[Document name to be amended] Statement

[Correction target item name] 0014

[Correction method] Change

[Correction content]

The magnetic field generator II also has a coil 19 and a yoke 20, and the yoke 20 also has a first claw 20c and a first yoke 20a and a second claw 20d. It is constituted by the second yoke 20b having.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing an embodiment of the present invention.

FIG. 2 is a perspective view showing the above embodiment with a part thereof cut away.

FIG. 3 is an explanatory diagram showing a state of magnetic flux in the above embodiment.

FIG. 4 is an explanatory view showing a mounting mode of the vehicle retarder.

FIG. 5 is a perspective view showing the prior art with a part thereof cut away.

[Explanation of symbols]

 8 rotary shafts 13 and 14 rotors 16 and 19 coils 18 and 20 yokes 18a and 20a first yokes 18b and 20b second yokes 18c and 20c first claw portions 18d and 20d second claw portions

Claims (1)

[Scope of utility model registration request] 1. A cylindrical rotor fixed to a rotary shaft and rotating integrally with the rotation of the rotary shaft, and a rotor fixed to a vehicle body and occupying the inside of the rotor to generate a magnetic flux. In a vehicle retarder having a coil that brakes the rotation of the rotor by the eddy current generated by the rotor, an annular coil that is arranged so as to surround the rotating shaft and a right end that abuts the upper end from the left end face side of the coil. A first yoke having a first claw portion extending to the surface side; and a second yoke having a second claw portion that abuts the upper surface from the right end portion side of the coil and extends to the left end surface side. And the second claws are alternately arranged on the outer peripheral surface of the coil so as to face the inner peripheral surface of the rotor in the circumferential direction of the coil, and the first and second yokes surround the coil along the peripheral surface. It has a yoke The vehicle retarder to.