JP3019187B2 - Cross-coil movement - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cross-coil type movement used as a movement of an instrument for a vehicle or the like, and more particularly to a cross-coil type movement characterized by a zero-zero structure.

[0002]

2. Description of the Related Art Conventionally, a cross-coil type movement has been used as a kind of instrument movement used for vehicles and the like. The cross-coil movement is usually
A magnet rotor is rotatably arranged inside a bobbin in which an upper bobbin and a lower bobbin are fitted, and coils are wound on the bobbin so as to cross each other. Then, a current that changes according to the measured amount is passed through the wound coil, and the magnet rotor is rotated in the direction of the composite magnetic field of the magnetic field generated in each coil, and is attached to the rotating shaft of the magnet rotor. The measured amount is displayed by the pointer.

Therefore, unless a rotational force is applied to the rotary shaft or the like to return the rotary shaft, that is, the pointer to the original position, the magnetic field generated in the coil when the power is turned off becomes zero. However, there is no fixed position of the pointer, and it becomes unstable. Therefore, except for the needle setting type, generally, a return-to-zero device that acts to return the hands to the zero position is attached to the cross-coil type movement.

FIGS. 2A and 2B show an example of a cross-coil type movement to which a zero-return device is attached. FIG. 2A is a cross-sectional view as viewed from the front, and FIG. FIG. As shown in the figure, in this cross-coil type movement, a magnet rotor 2 is disposed inside a bobbin 1 formed by fitting an upper bobbin 1a and a lower bobbin 1b. The magnet rotor 2 is provided with a disk-shaped magnet 2b having a pair of N and S poles magnetized on a peripheral portion and having a rotating shaft 2a at a central portion, and an upper portion of the rotating shaft 2a is provided on an upper bobbin 1a. The lower portion of the rotating shaft 2a is rotatably supported by a bearing 1bb of the lower bobbin 1b.

[0005] A plurality of coils 3 are provided outside the bobbin 1.
Are crossed and wound, and a drive current that changes in accordance with the measured amount is passed through the coils 3 to rotate the magnet rotor 2 in the direction of the combined magnetic field of the magnetic fields generated in the respective coils 3. The measurement amount is displayed on a dial (not shown) by a pointer (not shown) attached to the second rotating shaft 2a. Reference numeral 7 in the drawing is a mounting shaft that also serves as a terminal for supplying a drive current to the coil. On the other hand, a plurality of circular holes 4 are provided on the lower surface of the lower bobbin 1b as a return-to-zero device for returning the hands to the zero position when the current for driving the movement is turned off. A disc-shaped magnet 5 is fitted in a predetermined hole 4 in the inside. The position of the predetermined hole 4 is determined by the positional relationship between the instrument and the dial in which the movement is used.

In addition to the zero-return device using such a magnet, a zero-return device using a mustache whole dance is also widely used. For example, as shown in FIG. 3, one end of the beard full dance 6 is fixed to the rotating shaft 2a of the magnet rotor, the other end is fixed to the projection 1A of the bobbin 1, etc., and the hands are returned to zero by the rotation torque. Things. 3A is a perspective view, and FIG. 3B is a cross-sectional view taken along line BB of FIG. 3A. In these figures, the same parts as those in FIG. 2 are denoted by the same reference numerals. .

[0007]

However, in the case of the system using the mustache whole dance, since the cost is high and the rotational torque has a temperature characteristic, the adjustment of the indicating characteristic of the pointer is troublesome. There is also a problem in that the method using a magnet is costly, and the pointing characteristics vary due to variations in magnetism. Further, as described above, there is a type in which the magnet 5 can be fitted into the predetermined hole 4 according to the specification of the meter. However, since the magnet 3 must be set in advance before winding the coil 3, it is necessary to conform to the specification. There are many formats and they get complicated.

According to the present invention, the cost is low and the indicating characteristics are good.
Another object of the present invention is to provide a cross-coil type movement that can easily cope with many specifications.

[0009]

A cross-coil type movement according to the present invention has a disk shape having a peripheral portion magnetized inside a bobbin formed by fitting an upper bobbin and a lower bobbin and having a rotation axis at a center portion. along with the magnet rotor rotatably arranged in the wrapping formed by the cross-coil type movement by intersecting with each other a plurality of coils on the outside of the bobbin, besides the position where coils of the bobbin is wound, the magnetic It drilled a plurality of holes for insertion, specification
It is characterized in that a magnetic body is arranged in any of these holes depending on the situation.

[0010]

[0011] In the case of above, the magnetic body that make up <br/> with steel balls, good preferable particularly in terms of cost.

[0012]

According to the invention of the action] according to claim 1, in addition to the position where bobbin coils are wound, double for inserting a magnetic substance
A number of holes are drilled and one of these holes depending on the specification
A While the magnetic body is disposed, when the driving current corresponding to the measured amount of the coil is flowing, the direction of the suction force by the combined magnetic field generated by the coil than the suction force between the magnetic pole and the magnetic material of the magnet rotor Being so strong, the magnet rotor is oriented in the direction of the resultant magnetic field of the coil. Once the driving current is turned off, the combined magnetic field generated by the coil becomes zero, so that the magnet rotor rotates and returns to zero due to the mutual attractive force between the magnetic pole and the magnetic material. In particular, holes for inserting multiple magnetic
Is drilled, and magnetic material is inserted into any hole according to the specification
To meet various specifications.
It becomes possible. At that time, after the coil is wound
Since a magnetic material can be inserted,
There is no need to manufacture a movement to match the format,
It can be manufactured in a unified form,
It also leads to reduction.

[0013] In the case of this type of movement, claim 2
If the magnetic material is composed of steel balls as described in
Costs can be reduced compared to using
You.

[0014]

Embodiments of the present invention will be described below with reference to the drawings. The same or corresponding portions as those described in the description of the related art are denoted by the same reference numerals, and description thereof will be omitted. FIG. 1 shows an embodiment of the present invention.
(A) is a perspective view and (b) is a cross-sectional view taken along line AA of (a). As shown in the figure, three cylindrical holes 11 are formed in the upper surface of the upper bobbin 1a.
Of the magnet rotor 2 disposed inside the bobbin 1 extends to a position facing the peripheral edge of the circumference of the magnet rotor 2. A steel ball 12, which is a spherical magnetic material, is press-fitted into one of these holes 11 at the tip thereof.

The hole 11 into which the steel ball 12 is to be inserted depends on the specification of the instrument. When the driving current flowing through the coil 3 becomes zero, when the magnet rotor 2 returns to zero due to the attractive force with the steel ball 12, Then, the pointer attached to the rotating shaft 2a of the magnet rotor 2 is set at a position such that it indicates the zero position of the dial. Of course, if the specification of the instrument is determined to be one type from the beginning, only one hole 11 may be provided.

Further, since the positions of these holes 11 are provided at positions other than the position where the coil is wound, a magnetic body can be inserted after the coil is wound. Since there is no need to manufacture a movement according to the type, it is possible to uniformly manufacture the same type of movement, which leads to a reduction in cost. The steel ball 12 used here is a ball for a ball bearing for supporting the rotating shaft 2 a of the magnet rotor 2. The steel ball for a ball bearing has a high accuracy of the outer diameter and is not magnetized, so that stable return-to-zero characteristics and indicating characteristics can be obtained.
In addition, since it is not necessary to use expensive beard whole dance,
The cost of the entire movement can be reduced, and the adjustment of the pointer by the temperature characteristic of the whole beard is not required, so that the number of assembling steps can be reduced.

In this embodiment, the steel ball 12 is used as the spherical magnetic material. However, instead of this, the cost is slightly increased, but a spherical magnet may be inserted. In this case, it is necessary to pay attention to the direction of the magnetic pole.

[0018]

As described above, the cross-coil type movement according to the present invention has an effect that the manufacturing cost is low, the indicating characteristics are good, and it is possible to easily cope with many specifications.

[Brief description of the drawings]

FIG. 1 shows an embodiment of the present invention, wherein (a) is a perspective view,
(B) is a sectional view taken along line AA of (a).

2A and 2B show a conventional cross-coil type movement using a magnet as a zero-return device, wherein FIG. 2A is a cross-sectional view as viewed from the front, and FIG. 2B is a bottom view.

FIGS. 3A and 3B show a conventional cross-coil type movement using a mustache Zenmai as a return-to-zero device, wherein FIG. 3A is a perspective view and FIG. 3B is a cross-sectional view taken along line BB of FIG.

[Explanation of symbols]

 Reference Signs List 1 bobbin 1a upper bobbin 1b lower bobbin 2 magnet rotor 2a rotating shaft 2b disk-shaped magnet 3 coil 11 hole 12 steel ball

Claims (2)

(57) [Claims] 1. A disk-shaped magnet rotor having a peripheral edge magnetized and having a rotating shaft at a center portion is rotatably disposed inside a bobbin formed by fitting an upper bobbin and a lower bobbin, and a bobbin is provided outside the bobbin. in the cross-coil type movement formed winding by intersecting with each other a plurality of coils, other than the position where coils of the bobbin is wound, drilled a plurality of holes for inserting the magnetic member, the specification Depending on this
A cross-coil movement in which a magnetic material is placed in one of these holes . 2. The magnetic body comprises a steel ball.
The cross-coil movement of claim 1 .