JPH0628701Y2 - Cross coil type indicator - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a cross-coil type indicator, and is particularly suitable for speedometers, tachometers, boost meters, oil pressure gauges, etc. mounted on automobiles and the like. Regarding instruments.

[Conventional technology]

Conventionally, a current that changes according to the measurement amount is applied to a pair of coils that generate mutually orthogonal magnetic fields, and the magnet rotor is rotated in the direction of the combined magnetic field that combines the magnetic fields generated by the pair of coils. In-vehicle indicating instruments that display a measured amount by an indicator needle that rotates together with a magnet rotor are often used.

FIG. 3 shows a conventional indicating instrument of this type. A coil bobbin 2 is housed inside a magnetic shielding case body 1 having a cylindrical shape and one end of which is open. The two coils 3 and 3 are wound so as to be orthogonal to each other. A terminal terminal 4 for energizing each of the coils 3 is provided on the peripheral portion of the coil bobbin 2, and an S pole and an N pole are provided inside each of the coils 3.
A disk-shaped magnet rotor 5 having poles formed at diametrically symmetrical positions is arranged. A rotary shaft 6 extending in the axial direction of the coil bobbin 2 is attached to the center of the magnet rotor 5 as a first rotary shaft, and the magnet rotor 5 has the above-mentioned structure when the coil 3 is not energized. It is freely rotatable around the rotating shaft 6,
By energizing each coil 3 through the terminal terminal 4, the coil 3 can be rotationally driven by a predetermined angle. Further, a bearing hole 7 extending in the vertical direction is formed in the outer peripheral portion of the coil bobbin 2, and the second rotating shaft 8 is formed in the bearing hole 7 at a position eccentric from the axis of the first rotating shaft. Is rotatably held. The upper and lower ends of the rotating shaft 8 are formed to have a small diameter, and the lower end of the rotating shaft 8 is supported by a spherical thrust bearing 9 embedded in the bottom of the bearing hole 7 and is rotated. The upper end of the shaft 8 is a bearing member 10 fitted in the upper end of the bearing hole 7.
The rotary shaft 8 is held so as not to come off.

A rotary gear 11 is coaxially attached to the tip of the rotary shaft 6, and a transmission gear 12 that meshes with the rotary gear 11 is attached to the rotary shaft 8. , The movement 13 is formed. Further, the tip of the rotary shaft 8 is designed to penetrate the instrument panel with the movement 13 attached to the back surface of the instrument panel (not shown). The indicator needle 14 is fixed. A whisker bead 15 is fixed to the middle of the rotary shaft 8, and one end of a mustache spring 16 is fixed to the beard 15. The other end of the balance spring 16 is connected to the coil bobbin 2. The balance spring 16 directs the rotating shaft 8 in a state where the magnet rotor 5 can freely rotate without energizing the coil 3. Needle 14
Is urged to return to the 0 position on the instrument panel.

In the above-mentioned conventional indicating instrument, the combined magnetic field of the magnetic fields generated by the coils 3 is supplied by supplying a current that changes according to the measured amount to each of the coils 3 via the terminal terminal 4 according to a predetermined measured amount. Accordingly, the magnet rotor 5 is rotated by an angle corresponding to the measured amount. As a result, the rotary shaft 6 is rotated, the rotary shaft 8 is rotated via the rotary gear 11 and the transmission gear 12, respectively, and the indicator needle 14 is rotated on the instrument panel to display the measured amount. I have to. At this time, the balance spring 16 is in a state in which it is rolled up by the rotation of the rotary shaft 8 and an urging force is accumulated.

Then, when the vehicle is stopped or the like, the magnet rotor 5 is allowed to rotate freely when the coils 3 are not energized, and the pointer 14 is attached to the balance spring 16 attached to the rotary shaft 8. It is rotated by the accumulated biasing force and returned to the 0 position.

[Problems to be solved by the device]

However, in the above-mentioned conventional indicating instrument, since the bearing member 10 for rotating and holding the rotary shaft 8 and the balance spring 16 are separate members, the number of parts is increased, the manufacturing is difficult, and the manufacturing cost is low. It has the problem of increasing.

The present invention has been made in view of the above points, and an object of the present invention is to provide a cross-coil type indicating instrument that can be manufactured inexpensively and easily with a reduced number of parts.

[Means for Solving the Problems]

In order to achieve the above object, a cross coil type indicator according to the present invention comprises two coils wound around a coil bobbin in directions orthogonal to each other to form a cross coil, and the inside of the cross coil is energized by the above coils. A magnet rotor that rotates around a first rotation axis by a predetermined angle in accordance with a combined magnetic field of magnetic fields generated by the coils is provided, and a rotary gear is fixed to a tip end portion of the first rotation shaft of the magnet rotor, A second rotary shaft, to which a transmission gear meshing with the rotary gear is fixed and which is biased in the 0 position direction by a balance spring, is rotatably disposed at a position eccentric from the axis of the first rotary shaft, In a cross-coil type indicator instrument having an indicator needle attached to the tip of the second rotary shaft, the balance spring is equipped with one end thereof as a transmission gear of the second rotary shaft and the other end thereof as an upper part. It is characterized in that it has fixedly connected respectively to the bearing members of the second rotation shaft.

[Action]

According to the present invention, the magnet rotor is rotated in the direction of the combined magnetic field of the magnetic fields generated by the coils by supplying a current according to the predetermined measurement amount to the coils, whereby the first rotating shaft and the rotating shaft are rotated. The second rotating shaft is rotated through each of the gear and the transmission gear to display a predetermined measurement amount with the pointer needle, and when the coils are not energized, the indicating needle is the second rotating shaft. It is rotated by the urging force of the hairspring that is applied to and returned to the 0 position. The hairspring is fixed to the transmission gear of the second rotating shaft at one end and the bearing member of the second rotating shaft at the other end. No need for a beard for fixing to the second rotating shaft, the number of parts can be reduced, and the manufacturing can be performed easily and at low cost.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 and 2, and the same portions as those in FIG. 3 will be denoted by the same reference numerals and the description thereof will be omitted.

1 and 2 show an embodiment of the present invention, in which a coil bobbin 2 housed inside a magnetic shielding case body 1 is wound such that two coils 3 and 3 are orthogonal to each other. Inside each of the coils 3, a magnet rotor 5 rotatably held around a rotary shaft 6 is arranged.
When the coil 3 is not energized, it is freely rotatable about the rotating shaft 6 and is energized to each coil 3 through the terminal terminal 4 formed on the outer peripheral portion of the coil bobbin 2 to rotate the coil 3 by a predetermined angle. It is made possible.

Further, a bearing hole 7 extending in the vertical direction is formed on the outer peripheral portion of the coil bobbin, and a rotary shaft 8 is rotatably held in the bearing hole 7. The lower end of the rotary shaft 8 is supported by a spherical thrust bearing 9 embedded in the bottom of the bearing hole 7, and the upper end of the rotary shaft 8 is fitted into the upper end of the bearing hole 7. Bearing member 10
Thus, the rotary shaft 8 is held so as not to come off.
In this embodiment, the bearing member 10 functions as a beard. A rotary gear 11 is coaxially attached to the tip of the rotary shaft 6, and a transmission gear 12 meshing with the rotary gear 11 is attached to the rotary shaft 8. Furthermore, the bearing member 10
One end of a balance spring 16 is fixed to the outer peripheral surface of the mainspring 16 and the other end of the balance spring 16 is fixed to a mainspring mounting pin 17 formed on the lower surface of the transmission gear. The balance spring 16 urges the rotating shaft 8 to return to the 0 position in a state where the magnet rotor 5 can freely rotate without energizing the coil 3.

Further, the tip of the rotary shaft 8 penetrates the instrument panel with the movement 13 attached to the back surface of the instrument panel, and the indicator needle 14 is fixed to the tip of the rotary shaft 8.
Further, in the transmission gear 12, teeth are formed only in a portion where the indicating needle 14 can rotate from the 0 position on the scale of the instrument panel to a predetermined maximum value position, and both ends of the tooth forming portion have teeth. Stopper 1 for preventing engagement with the rotary shaft 6
8 is formed.

Next, the operation of this embodiment will be described.

In this embodiment, a sine curve is applied to each of the coils 3 via the terminal terminal 4 according to a predetermined measurement amount.
By supplying the voltage according to the cosine curve, the magnet rotor 5 is rotated by an angle corresponding to the measured amount according to the combined magnetic field of the magnetic fields generated by the coils 3. As a result, the rotary shaft 6 rotates, and the rotary shaft 8 is rotated via the rotary gear 11 and the transmission gear 12, respectively.
By rotating the indicator needle 14 on the instrument panel,
The measured amount is displayed. Then, the driver visually recognizes the indicator needle 14 to recognize the measured speed, engine speed, and the like. At this time, the balance spring 16 is in a state in which it is caught by the rotation of the rotary shaft 8 and an urging force is accumulated.

The magnet rotor 5 is allowed to rotate freely when the coils 3 are not energized, such as when the automobile is stopped, and the pointer 14 of the balance spring 16 attached to the rotary shaft 8 is rotated. By the urging force, the stopper 18 of the transmission gear 12 is rotated until it comes into contact with the rotary gear 11, and is returned to the 0 position.

Therefore, in the present embodiment, the bevel spring 16 is directly fixed to the bearing member 10 and the beard balls are omitted as in the conventional case. Therefore, when the rotary shaft 8 is attached to the bearing hole 7, the bearing member 10 is The balance spring 16 can be mounted at the same time as mounting, the number of parts can be reduced, and the manufacturing can be performed easily and at low cost. In addition, the stopper 18 formed on the transmission gear 12 causes the pointer 14 to move to zero.
Since it is stopped at the position, when the transmission gear 12 is mounted on the rotary shaft 8, the stopper 18 is attached to a position where it abuts against the teeth of the rotary gear 11, so that the transmission gear 12 is surely moved to the 0 position. The transmission gear 12 can be mounted at a corresponding position, and even if a biasing force is applied to the rotating shaft 8 by the balance spring 16, the mounting position of the transmission gear 12 is not displaced by the stopper 18, and the assembling work is facilitated. Can be done.

[Effect of device]

As described above, in the cross coil type indicator according to the present invention, the balance spring has one end connected to the transmission gear of the second rotating shaft and the other end connected to the bearing member of the second rotating shaft. Since it is fixed, there is no need for a beard ball for fixing the hairspring to the second rotary shaft as in the conventional case, and the number of parts can be reduced, resulting in easy and inexpensive manufacturing. And the like.

[Brief description of drawings]

1 and 2 show an embodiment of the present invention. FIG. 1 is a perspective view of a movement portion, FIG. 2 is a longitudinal sectional view, and FIG. 3 is a longitudinal sectional view showing a conventional indicating instrument. It is a figure. 1 ... Magnetic shielding case body, 2 ... Coil bobbin, 3 ... Coil, 5 ... Magnet rotor, 6 ... First rotating shaft,
7 ... Bearing hole, 8 ... Rotating shaft, 9 ... Thrust bearing, 1
0 ... Bearing member, 11 ... Rotary gear, 12 ... Transmission gear, 13 ... Movement, 14 ... Indicator needle, 16 ...
Beard mainspring.

Claims (1)

[Scope of utility model registration request] 1. A cross coil is constructed by winding two coils around a coil bobbin in a direction orthogonal to each other, and a cross coil is formed inside the cross coil according to a combined magnetic field of magnetic fields generated by energization of the coils. A magnet rotor that rotates a predetermined angle about the first rotation shaft is provided, and a rotation gear is fixed to the tip end portion of the first rotation shaft of the magnet rotor, and a transmission gear that meshes with the rotation gear is fixed. A second rotating shaft biased in the 0 position direction by a balance spring is rotatably arranged at a position eccentric from the axis of the first rotating shaft, and an indicator needle is provided at the tip of the second rotating shaft. In the cross-coil type indicator instrument, the one end of the balance spring is fixed to the transmission gear of the second rotating shaft and the other end is connected to the bearing member of the second rotating shaft. A cross-coil type indicating instrument characterized by