JP3591176B2 - Eddy current dynamometer - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an eddy current dynamometer used for measuring power of a vehicle.
[0002]
[Prior art]
4 and 5 show a semi-longitudinal front view and a side view of the eddy current type dynamometer, wherein 1 is a bed, 2 is a bearing base provided on the bed 1, and 3 is a bearing base 2 via a swing bearing 4. The bracket 5 slidably supported by the bracket 5 is a rotation shaft rotatably supported by the bracket 3 via a rotation bearing 6, and is connected to, for example, a rotation shaft of a roller of a chassis dynamometer. Reference numeral 7 denotes a rotor disk attached to the rotating shaft 5, and reference numeral 8 denotes a yoke of a two-part structure attached to the outer periphery of the bracket 3, and the divided parts 8a and 8b are integrated so as to have a cut 8c on the inner peripheral side. . The rotor disk 7 is inserted into the cut 8c, and grooves 8h are radially provided on the surface facing the rotor disk 7, as shown in FIGS. It is formed.
[0003]
Reference numeral 9 denotes a coil provided inside each of the divided portions 8a and 8b, and reference numeral 10 denotes a water supply pipe formed of a rubber hose having one end attached to the bearing base 2 and the other end connected to a water supply hole 8e of the yoke 8, 8f and 8g. Are water passage holes provided in the yoke 8 from the water supply hole 8e and provided to the inner peripheral side of each of the divided portions 8a and 8b, and 11 and 12 are drainage receiving holes and drainage holes provided in the bed 1. Reference numeral 13 denotes an erection bolt erected on each coil 9, which is inserted into the yoke 8, and the coil 9 is fixed to the yoke 8 by screwing a nut 14. Reference numeral 15 denotes a bearing oil supply / dropping device provided on the bearing base 2. Reference numeral 16 denotes throttles provided in the water holes 8f and 8g, which are alternately provided with the studs 13 in the circumferential direction. Reference numeral 17 denotes a torque arm attached to the yoke 8, reference numeral 18 denotes a load cell provided on the bed 1, and reference numeral 19 denotes a tachometer provided around the rotary shaft 5.
[0004]
In the above configuration, a direct current flows through each coil 9 and a magnetic flux is generated as shown by an arrow in FIG. In the inductor section 8d, the magnetic flux changes due to unevenness, and the rotor disk 7 rotates together with the rotating shaft 5, so that an eddy current is generated in the rotor disk 7 to absorb power. On the other hand, a torque is generated by the electromagnetic force in the swinging portion including the bracket 3 and the yoke 8, and the torque is measured by the load cell 18 via the torque arm 17. The tachometer 19 detects the number of revolutions of the rotating shaft 5, and the power is measured from the torque and the number of revolutions.
[0005]
Further, the rotor disk 7, the inductor portion 8d of the yoke 8, and the coil 9 generate heat and need to be cooled. Therefore, cooling water is guided from the water supply source to the coil 9 through the water holes 8f and 8g via the water supply pipe 10, and through the gap between the rotor disk 7 and the yoke 8, and the cooling water is drained from the bed 1. The water is discharged to the outside from the drain hole 12 through the receiver 11.
[0006]
[Problems to be solved by the invention]
In the above-mentioned conventional eddy current type dynamometer, the cooling water is divided into two parts from the water supply pipe 10 so as to pass through the water holes 8f and 8g, and balance the water flow of the water holes 8f and 8g. We had a stop 16 provided on Kakutsu water hole 8f, 8 g to take. That is, as shown in FIG. 7, the throttle 16 is screwed to the yoke 8 across the water passage holes 8f and 8g via the O-ring 20, and the cooling water is also supplied to the back side of the coil 9. A three-way aperture was used to supply, and a special aperture had to be used, which was time-consuming and costly. Also, since the water passage holes 8f and 8g are formed in the yoke 8, the structure of the yoke 8 is complicated, which also requires time and cost. Further, since two coils 9 were used, manufacturing cost and assembly time were required.
[0007]
SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and can reduce the time and cost by simplifying the structure of the diaphragm and the yoke, and can reduce the cost and the assembly time by using a single coil. It is an object to obtain an eddy current type dynamometer that can be used.
[0008]
[Means for Solving the Problems]
An eddy current dynamometer according to claim 1 of the present invention includes a bracket supported swingably on a bearing base, a rotating shaft rotatably supported on the bracket, a rotor disk mounted on the rotating shaft, A substantially flat portion and a U-shaped portion were integrated so as to have a cut, and attached to the outer periphery of the bracket. The rotor disk was inserted into the cut, and an inductor portion having irregularities was provided on the surface facing the rotor disk. A yoke, a coil provided inside the U-shaped portion, and a pair of water supply pipes are formed so as to separately pass through the bracket and the inner peripheral side of the yoke from the pair of water supply pipes, pass between the yoke and the rotor disk, and reach the coil. And a protruding portion at both ends of a U-shaped portion of the yoke having a divided structure .
[0009]
BEST MODE FOR CARRYING OUT THE INVENTION
Embodiment 1
FIGS. 1 and 2 show a semi-longitudinal front view and a partially enlarged view of an eddy current dynamometer according to Embodiment 1 of the present invention, and a reference numeral 21 denotes a yoke attached to the outer periphery of a bracket 3, which is substantially flat. The portion 21a and the U-shaped portion 21b are integrated so as to have a cut 21e on the inner peripheral side, and the U-shaped portion 21b has a structure in which both end protruding portions 21c and 21d are divided. Therefore, the yoke 21 is composed of four parts, which are integrated by fastening bolts. The flat plate portion 21a is actually slightly U-shaped, but the protrusions at both ends are flush.
[0010]
A coil 22 is provided inside the U-shaped portion 21b, and the coil 22 has two ampere turns of the conventional coil 9 and has a size of two. The rotor disk 7 is inserted into the cut 21e, and an inductor portion 21f having irregularities is formed on the surface facing the rotor disk 7. An implant bolt 13 is implanted in the coil 22. The implant bolt 13 is inserted into the U-shaped portion 21 b, and the nut 22 is screwed to fix the coil 22 to the yoke 21.
[0011]
The bracket 3 is provided with a pair of water holes 3a and 3b extending to the inner peripheral side of the yoke 21, and a pair of water supply pipes 23 is connected to each of the water holes 3a and 3b.
[0012]
In the above configuration, the operation of the power measurement is the same as the conventional one. The cooling water passes from the water supply source through the water holes 3a and 3b through the pair of water supply pipes 23, is guided to the coil 22 through the gap between the rotor disk 7 and the yoke 8, and further flows through the drain hole 11 through the drain receiver 11. , And during this time, the inductor portion 21f of the yoke 21, the rotor disk 7, and the coil 22 are cooled.
[0013]
In the first embodiment, the water supply system is externally divided into two systems, and in order to balance the flow rate between the systems, it is sufficient to provide a throttle in each water supply system outside, and the installation of the throttle is easy. A commercially available diaphragm can be used. Further, since the water passage holes 3a and 3b are provided on the bracket 3 which is relatively easy to process and not provided on the yoke 21, the manufacture of the yoke 21 is facilitated. Further, since one coil 22 is used, manufacture and assembly are facilitated. Also, the yoke 21 is composed of a substantially flat portion 21a and a U-shaped portion 21b, and the projecting portions 21c and 21d at both ends of the U-shaped portion 21b have a divided structure. Can be used, and the processing becomes easy.
[0014]
Since the coil 22 comes into contact with the cooling water, the coil 22 is sealed with a non-magnetic pack, or is entirely molded to have a waterproof and insulating structure.
[0015]
Embodiment 2
FIG. 3 is a longitudinal sectional view of a main part of the eddy current dynamometer according to the second embodiment. The yoke 21 is the same as the first embodiment in that the yoke 21 is composed of a substantially flat portion 21a and a U-shaped portion 221b. This embodiment is different from the first embodiment in that the U-shaped portion 21b is not divided. Other configurations are the same as in the first embodiment.
[0016]
According to the second embodiment, since the U-shaped portion 21b does not have a divided structure, it is necessary to cut out the recessed portion from a material having a large thickness, which makes it difficult to obtain and process the material. Other effects are the same as those of the first embodiment.
[0017]
【The invention's effect】
As described above, according to the first aspect of the present invention, the cooling water is supplied to the inside through a pair of water supply pipes provided outside, and the throttle for adjusting the water supply balance between the water supply systems is externally provided. It can be provided, is easy to install, can use a commercially available diaphragm, and can reduce manufacturing time and cost. In addition, since the internal water holes are provided not in the yoke whose processing is complicated but in the bracket which is easy to process, the manufacturing time and cost can be reduced. Furthermore, since one coil is used, manufacturing such as insulation processing is facilitated, and manufacturing cost and assembly time can be reduced. Further, since the protruding portions at both ends of the U-shaped portion of the yoke have a divided structure, a material having a large plate thickness is not required, so that processing can be facilitated and cost can be reduced.
[Brief description of the drawings]
FIG. 1 is a half longitudinal sectional view of an eddy current dynamometer according to a first embodiment of the present invention.
FIG. 2 is an enlarged view of a main part of FIG.
FIG. 3 is a longitudinal sectional view of a main part of an eddy current dynamometer according to a second embodiment.
FIG. 4 is a half longitudinal sectional view of a conventional eddy current dynamometer.
FIG. 5 is a side view of a conventional eddy current dynamometer.
FIG. 6 is a partially enlarged view of FIG. 4, a view taken along the line XX, and a cross-sectional front view taken along the line YY.
FIG. 7 is a partially enlarged view of FIG. 4;
[Explanation of symbols]
2 ... Bearing stand 3 ... Brackets 3a and 3b ... Water hole 4 ... Swing bearing 5 ... Rotating shaft 6 ... Rotating bearing 7 ... Rotor disk 21 ... Yoke 21a ... Substantially flat portion 21b ... U-shaped portions 21c and 21d ... projecting portions 21e at both ends ... cuts 21f ... inductors 22 ... coils 23 ... water supply pipes

Claims (1)

A bracket pivotally supported by the bearing base, a rotating shaft rotatably supported by the bracket, a rotor disk mounted on the rotating shaft, and a substantially flat plate-shaped portion and a U-shaped portion on the inner peripheral side. A yoke in which a rotor disk is inserted and attached to the outer periphery of the bracket so as to have a notch, the rotor disk is inserted into the notch, and an inductor portion having irregularities is provided on a surface facing the rotor disk, and a yoke provided inside the U-shaped portion a coil wound through the separate inner circumferential side of the bracket in and yoke of a pair of water supply pipe, and a cooling water passage formed so as to reach the coil passes between the yoke and the rotor disk, the yoke of the U-shape An eddy current dynamometer characterized in that the projecting portions at both ends of the shape are divided .

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