JPS61130874A - Generator for speedometer - Google Patents

Abstract

PURPOSE:To improve the output voltage with a reduction in the leakage magnetic flux, by forming ends of respective magnetic pole cores to match the torsion angle of a herical gear. CONSTITUTION:A herical gear 2' meshed with a herical gear of an output shaft of a motor is mounted on a shaft rotatably in a gear case 1 provided on a t ruck of a railway vehicle. Then, a coil 7 is wound at ends 56a and 5b of a magnetic pole core 5 fastened on both sides of a permanent magnet 4 and is opposed to the face of teeth of the gear 2' with a clearance C therebetween. The core end 5a is opposed to the tip 2a of the gear 2' while the core end 5b to the bottom 2b thereof. A part of the core ends 5a and 5b is scraped off copying the torsion angle of the gear 2' and areas 5c and 5d corresponding to the scraped area are added following the torsion angle of the gear 2' to make up for the scraped area. This allows the retaining of the sectional area of a magnetic path to eliminate leakage magnetic flux thereby improving the output voltage while making the equipment smaller and lighter as a whole.

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field of the Invention) The present invention relates to a speedometer generator that detects the speed of a railway vehicle by the rotation of a bogie gear, for example.

[Technical background of the invention and its problems]

The already proposed speedometer M* is used to detect the speed of a running vehicle and control an automatic train control device. The speedometer output ff1llll that has already been proposed is the seventh
It is configured as shown in the figure.

That is, in FIG. 7, reference numeral 1 denotes a gear case provided on a bogie of a railway vehicle. A gear 2 is rotatably mounted on a shaft, and the axle of this gear 2 is provided with a pair of wheels that roll on a rail.

On the other hand, a holding member 3 that also serves as a lid is fixed to the opening 1a of the gear case 1 located directly above the gear 2, and a permanent magnet 4 is stuck inside the holding member 3. It is set up. Further, on both sides of the permanent magnet 4, a pair of bifurcated magnetic pole cores (magnetic cores) 5 are attached to the holding member 3.
Each core end 5a, 5b of both magnetic pole cores 5 is wound with each coil (LA co-coil 7). , 5b are opposed to the tooth surfaces of the gear 2 with a gap C therebetween.The permanent magnet 4, the magnetic pole core 5, and the coil 7 are integrally molded with an insulator 8 made of a synthetic resin material. It is formed as follows.

Therefore, the above-mentioned speedometer generator uses the shape of the uneven tooth profile formed on the gear 2 by the teeth of the gear 2 and the magnetic circuit of the fixed magnetic pole core 5, and makes one rotation of the gear. The resulting change in magnetic flux density induces a voltage in the coil 7 wound around the magnetic pole core 5, and this induced voltage causes
Speed indicator or automatic train control device connected to this
(A, T.

S). ), the output voltage e induced in the coil 7 and the rotation speed N of the gear 20 are
The relationship with is shown by curve (solid line) A in the graph of FIG. In other words, this curve A represents each core end 5a, 5b of the magnetic pole core 5 facing the tooth top 2a and tooth bottom 2b of the gear 2.
This figure shows the relationship between the output voltage e and the rotational speed N when they match.

However, the gear 2 made of the above-mentioned spur gear, when transmitting power,
The helical gear 2' has a helix angle θ because it has poor transmission efficiency and generates vibration and noise (see Figure 8).
It has been proposed to improve power transmission and reduce vibration and noise by adopting

In this case, the arrangement positions of the helical gear 2' and each core end portion 5a, 5b of the magnetic pole core 5 are as shown in FIG. That is, when the one core end 5a faces the tooth tip 2a of the helical gear 2', the other core end 5b faces the tooth bottom 2b.

However, each core end portion 5a, 5b of the magnetic pole core 5
As shown in FIG. 8, since the tooth tips 2a and the tooth bottoms 2b of the helical gear 2' do not perfectly match, the magnetic path cross-sectional area becomes small, leakage magnetic flux occurs, and the output voltage decreases. When the output voltage decreases as shown by curve (dotted line) B in Figure 9, malfunctions of speed indicators and automatic train control devices occur, causing many troubles in train running. There is.

On the other hand, it is also possible to install the core ends 5a and 5b of each pair of molded magnetic pole cores 5 to match the torsion angle θ, but this would increase the size of the entire device and reduce the installation dimensions of the gear case 1. It is difficult to incorporate it into a trolley, which has severe restrictions.

[Purpose of the invention]

The present invention has been made in view of the above-mentioned circumstances, and aims to improve output voltage by reducing leakage flux by forming each core end of each magnetic pole core to match the helix angle of a helical gear. The present invention provides a speedometer generator for the purpose of achieving the following.

[Summary of the invention]

The present invention aims to eliminate the core end of a magnetic pole core wrapped with a coil disposed opposite to the tooth tips and tooth bottoms of the helical mI, following the helix angle of the helical gear, and to An area corresponding to the removed area is added and formed to follow the helix angle of the gear to improve the output voltage.

[Embodiments of the invention]

Hereinafter, the present invention will be described with reference to an illustrated embodiment.

Note that the present invention includes the same constituent members as those in the above-mentioned specific example.
The same reference numerals will be used for explanation.

In FIGS. 1 to 4, reference numeral 1 denotes a gear case provided on a bogie of a railway vehicle, and inside this gear case 1 is a helical gear 2' that meshes with a helical gear mounted on the output shaft of an electric motor. is rotatably mounted on a shaft,
A pair of wheels that roll on a rail are provided on the axle of this helical gear 2'. In addition, the helical gear 2
A holding member 3, which also serves as a lid, is fixed to the opening 1a of the gear case 1 located directly above the gear case 1, and a permanent magnet 4 is attached to the inside of the holding member 3. . Further, on both sides of this permanent magnet 4, magnetic pole cores 5 are fixed to the holding member 3 with respective mounting bolts 6, and at the bottom of both magnetic pole cores 5, respective iron core ends 5a and 5b are fixed with fixing bolts. 9 are vertically disposed in a bifurcated shape. Additionally, coils (magnetic coils) 7 are wound around each core end 5a, 5b, and each core end 5a, 5t) is connected to the teeth of the helical gear 2'. They face each other with a gap C between them. The permanent magnet 4, magnetic pole core 5, and coil 7 are integrally molded with an insulator 8 made of synthetic resin.

In particular, each core end 5a, 5b of the magnetic pole core 5 according to the invention
The arrangement positions of the helical gear 2' and the helical gear 2' are arranged as shown in FIGS. 2 to 4. That is, one core end 5a faces the tooth tip 2a of the helical gear 2', and the other core end 5b faces the tooth bottom 2b.

Further, a portion of both iron core ends 5a and 5b are cut off following the helix angle θ of the helical gear 2', and
Area corresponding to this area (replenishment part) 5c, 5
d is added following the helix angle θ of the helical gear 2',
The removed area of both core ends 5a and 5b is replenished by a corresponding area (replenishment portion) 5C95d.

In addition, the supplementary parts 5 added to the above-mentioned both core ends 5a and 5b
c and 5d are 2 in the width direction of the helical gear 2' in Fig. 4.
It is expanded by g.

Therefore, each core end 5a, 5 of the magnetic pole core 5 according to the present invention
b represents the tooth tip 2a of the helical gear 2' and the tooth If! 2b, the cross-sectional area of the magnetic path is maintained, leakage flux is eliminated, and the output voltage becomes as shown by curve A shown in the graph of FIG. Automatic train control equipment can be operated accurately.

Next, in another embodiment of the present invention shown in FIG. 5, supplementary parts 5c and 5d added to both core ends 5a and 5b are expanded by 2w in the face width direction of the helical gear 2'. be.

On the other hand, in another embodiment of the present invention shown in FIG. 6, supplementary parts 5c and 5d added to both core ends 5a and 5b are expanded in the width direction and face width direction of the helical gear 2', respectively. It was formed by

〔Effect of the invention〕

(2) As described above, according to the present invention, the core ends 5a and 5b of the magnetic pole core 5 around which the coil 7 is wound are disposed facing the tooth tip 2a and the tooth bottom 2b of the helical gear 2'. , the helical gear 2' is removed following the helix angle θ, and an area corresponding to the removed area is added following the helix angle of the gear, so the cross-sectional area of the magnetic path is This not only makes it possible to eliminate leakage magnetic flux, but also makes it possible to reduce the size and weight of the entire device.

[Brief explanation of drawings]

FIG. 1 is a sectional view of the speedometer generator according to the present invention, FIG. 2 is a side view showing the main parts of the present invention, and FIG. 3 is a bottom view along the chain 1i1A-A in FIG. 4 are diagrams for explaining the present invention in detail, FIGS. 5 and 6 are diagrams showing other embodiments of the present invention, and FIG. 7 is an already proposed speedometer. A sectional view of the generator, and FIG. 8 is a bottom view showing the relative position of the magnetic pole core and gears in this speedometer generator.
FIG. 9 is a graph showing the relationship between output voltage and rotation speed. 1... Gear case, 2'... Helical gear, 2a.
... Tooth tip, 2b... Tooth bottom, 3... Holding member, 4...
- Permanent magnet, 5... Magnetic pole core, 5a, 5b... Core end, 5c, 5d... Replenishment part, 7... Coil, 8.
··Insulator. Construction j, 2' Figure 2 Figure 3 - も会　　　~

Claims (1)

[Claims] The core end of the magnetic pole core, which is wound with a coil, which is arranged opposite to the tooth tips and tooth bottoms of the helical gear, is cut off following the helix angle of the helical gear, and the removed area is A speedometer generator characterized in that an area corresponding to the helix angle of the gear is added and formed.