JP3042230U - Core structure for odometer / speedometer instruments - Google Patents

Abstract

(57) Abstract: In a rotating magnetic field type instrument to be installed in an automobile, by using a magnetic disk having high magnetism, the amount of copper wire to be wound is significantly reduced, the size of the core is reduced, and The high magnetic magnetic disk makes the pointer of the instrument move more stable and accurate. A wire installation table has a sealed oil filling chamber in which a magnetic disk is disposed, and a thin shaft installed in the center of the magnetic disk passes through an upper lid of the oil filling chamber and projects outward, so that a pointer is provided. It is designed to be attached to one end of the wire installation base, and a copper wire is wound around the wire installation base to be built in the outer case, and the outer case is made of a non-magnetic material. Is a thin and long metal magnetic belt wound in multiple layers in a coil to form a magnetic shield, and the core is protected from external magnetic interference during operation and has high magnetism. The magnetic disk allows the pointer to be moved without causing vibration or shaking, so that the core operates more accurately.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to a core structure for an odometer / speedometer instrument.

[0002]

[Prior art]

 FIG. 1 shows a conventional instrument core 1. As shown in the exploded perspective view of FIG. 2, a conventional instrument core 1 for an automobile has a magnetic disk (not shown) housed in a sealable oil filling chamber 4 of a wire installation table 3 having a thin bolt 2. ), And the shaft 5 is formed integrally with the magnetic disk. A pointer 6 is attached to one end of the shaft 5 to indicate a character or a code on the front panel of the instrument. A copper wire 7 is wound around the wire installation base 3 and is housed in a metal case 8. When a current flows through the wound copper wire 7, the magnetic disk is guided or rotated by a certain angle. Then, the pointer 6 indicates the corresponding character or code on the instrument.

[0003]

[Problems to be solved by the device]

 An essential part of the instrument manufacturing technology is the production of magnetic disks, and the magnetism of the magnetic disks affects the operating characteristics of the entire instrument. In this field, the dimensions of conventional instruments have not been effectively reduced, and such technical improvements have not been adequate.

Therefore, a first object of the present invention is to provide a core for use in a rotating magnetic field type instrument installed in an automobile, which uses a magnetic disk having high magnetism. This significantly reduces the amount of copper wire to be wound, reduces the size of the core, and the high-magnetic magnetic disk allows the pointer of the instrument to be more stable and move accurately. is there.

A further object of the present invention is to provide an improved core housed in a non-magnetic outer case and a magnetic shield coiled by an elongated thin metal belt to prevent external magnetic fields from being applied to the core. The goal is to prevent interference and make the instrument pointer work more accurately.

[0006]

[Means for Solving the Problems]

 In order to achieve the above object, the present invention provides an improved core structure for use in a vehicle instrument, the core structure being wound around an outer case, a wire installation base, and the wire installation base. A copper wire, a magnetic disk having a thin shaft penetrating through the center, and a pointer attached to one end of the thin shaft of the magnetic disk. There is an oil filling chamber, the thin shaft installed in the center of the magnetic disk passes through the upper lid of the oil filling chamber and projects outward, and the pointer is attached to one end thereof. The copper wire is wound around the wire installation base and built in the outer case, and the outer case is made of a non-magnetic material, and the inner surface of the case is A long and thin metal magnetic belt is wound in multiple layers to form a magnetic shield, and the core is protected from external magnetic interference during operation. In the magnetic disk having, the pointer can be moved without causing vibration or shake, and the core operates more accurately.

[0007]

[Embodiment of the invention]

 An embodiment of the present invention will be described with reference to the drawings. FIG. 2 shows a core of the present invention, which is a core 1 of the present invention for use in an automobile instrument, including an outer case 10 made of a non-magnetic material, a wire mounting base 20, and The copper wire 30 wound around the wire installation table 20, a magnetic disk 40 made of a material having a high magnetic property, a thin shaft 42 implanted in the center of the disk 40, a finger needle 50, and the outer case 10 described above. And an elongated thin metal belt 60 made of a magnetic material and disposed on the inner surface.

The magnetic disk 40 is made of a material having a high magnetism which is two to three times as high as that of an ordinary magnetic disk. A thin shaft 42 implanted in the center of the magnetic disk 40 is formed integrally with the magnetic disk 40. The pointer 50 is fixed to the end of the shaft 42 after the assembly of the core structure is completed. The wire installation table 20 is formed with a sealable oil-filled chamber 22 in which a magnetic disk 40 and an integral thin shaft 42 are built. Of course, one end of the thin shaft 42 passes through the upper lid 22a of the filling chamber 22 and extends out from there, and the pointer 50 is fixed to the tip thereof.

Since the magnetic disk 40 has a few or three times stronger magnetism, the number of turns of the copper wire 30 wound on the wire installation base 20 is much smaller than that of the conventional copper wire 30, so that the copper wire 30 is wound less. The finished size of 30 can be substantially reduced. But overall, it has a much greater capability than the core of a conventional instrument. Therefore, the dimensions of the wire mount 20 are reduced as a result of removing the extra copper wire 30, which in turn allows the overall core volume to be smaller. In FIG. 1, a conventional instrument has a metal case 8 that is much larger than the non-magnetic outer case 10 of the present invention.

Further referring to FIG. 5, there is shown a state in which a thin metal magnetic belt 60 is wound in a coil shape to form a magnetic shield. The magnetic belt 60 is wound around 10 layers or more to form a magnetic shield. The wire installation table 20 and the copper wire 30 wound around it are installed in the outer case 10 and the magnetic shield assembly arranged on the inner surface of the outer case 10.

[0011]

[Effect of the invention]

 From the above description of the present invention, the improved core structure for an odometer / speedometer instrument of the present invention has the following advantages. 1. With the novel magnetic disk with high magnetism of the present invention, the pointer operates much more stably and firmly than the conventional one without vibrating when the letters and codes of the instrument are indicated. 2. The outer shape of the instrument core structure can be made compact without degrading the performance. 3. The use of a magnetic shield protects the core from external magnetic interference and allows the core to operate more accurately. 4. By reducing the size of the copper wire and outer case, the production cost can be effectively suppressed.

[Brief description of the drawings]

FIG. 1 is an enlarged exploded perspective view of components of a conventional instrument used in an automobile.

FIG. 2 is a perspective view showing an assembled state of FIG.

FIG. 3 is an enlarged exploded perspective view of components of the instrument of the present invention.

FIG. 4 is a perspective view showing an assembled state of the instrument of FIG.

FIG. 5 is a schematic view showing a metal belt made of a magnetic material wound in a coil shape of the present invention to form a magnetic shield.

[Explanation of symbols]

 10 non-magnetic outer case 20 installation base 22 chamber 30 copper wire 40 magnetic disk 42 shaft 50 pointer 60 thin thin metal belt

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical display location G01R 1/18 G01R 1/18 H01F 3/08 H01F 3/08

Claims (1)

[Utility model registration claims] 1. An improved core structure for use in an automotive instrument, the core structure penetrating an outer case, a wire mount, a copper wire wrapped around the wire mount, and a center. The magnetic disk includes a magnetic disk having a thin shaft and a pointer attached to one end of the thin shaft of the magnetic disk, and the wire installation table has a sealed oil filling chamber in which the magnetic disk is disposed. The thin shaft installed in the center passes through the upper lid of the oil filling chamber and projects outward, and the pointer is attached to one end of the oil filling chamber. The wire is wound and built in the outer case, and the outer case is made of a non-magnetic material, and the inner surface of the case has a number of thin and elongated metal magnetic belts. Is also wound into a coil to form a magnetic shield, and the core is protected from external magnetic interference during operation. A core structure for an odometer / speedometer instrument, characterized in that the core can be moved to a more precise position so that it operates more accurately.