JPH0634660A - Cross coil type indicator - Google Patents

Abstract

PURPOSE:To obtain a cross coil type indicator which is a multi-rotation type indicator and enables proper positioning of a zero position of a pointer without providing a stopper pin on a dial plate. CONSTITUTION:In the case when a force of rotation of a magnet rotor 5 rotating multiply is transmitted through speed-reducing transmission mechanisms 15 and 19 connecting a rotor shaft 6 and a drive shaft 18 together, a stopper 21 and a contact projection 20 constructing zero point stoppers of a pointer 12 are disposed on the drive shaft 18 side. Positioning of a zero position of the pointer 12 is conducted by the zero point stoppers 20 and 21 disposed on the drive shaft 18 side.

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 indicator, and more particularly to a multi-axis cross-coil type indicator for transmitting rotation of a rotor shaft of a magnet rotor to a drive shaft to drive a pointer.

[0002]

2. Description of the Related Art Generally, a current that changes in accordance with a measurement amount is applied to a pair of coils that generate mutually orthogonal magnetic fields, and a magnet rotor is rotated in the direction of a synthetic magnetic field of the magnetic fields generated by the pair of coils. In many cases, a cross-coil type in-vehicle indicating instrument that displays a measured amount by a pointer that rotates together with the magnet rotor is used.

FIG. 8 shows such a conventional cross coil type indicator instrument. The instrument movement 2 of the instrument unit 1 has a coil bobbin 3, and the coil bobbin 3 has two coils. 4 and 4 are wound so as to be orthogonal to each other. Inside the coil bobbin 3, a disk-shaped magnetnet rotor 5 having S poles and N poles is rotatably arranged. The magnet rotor 5 has a central portion in the axial direction. Extending rotor shaft 6
Is attached.

A bearing recess 7 is formed in the center of the lower surface of the magnet rotor 5 accommodating portion of the coil bobbin 3. Inside the bearing recess 7, a braking force is applied to the rotor shaft 6 to apply rotor force to the rotor. Filler 8 such as silicon is filled to prevent unnecessary swinging of shaft 6. The magnet rotor 5 is freely rotatable about the rotor shaft 6 when the coils 4 are not energized. By energizing the coils 4,
It can be rotated by a predetermined angle. further,
On the outer circumference of the coil bobbin 3, a magnetic shielding case 9 for shielding the magnetic field is provided.

A dial 10 on which predetermined characters, scales, etc. are formed is fixed to the upper surface of the movement 2 by means of a set screw 11, and the tip of the rotor shaft 6 is fixed to the dial 10. The dial 10 is penetrated with the movement 2 attached to the back surface. Further, the pointer 12 is fixed to the tip of the rotor shaft 6, and the instrument unit 1 is formed by the above configuration.

The instrument unit 1 is housed inside a combination meter (not shown), and the combination meter is attached to an instrument panel of a vehicle such as an automobile.

In the above-mentioned conventional indicating instrument, a predetermined current as a drive signal based on a predetermined measurement signal such as a vehicle speed is supplied to each of the coils 4 to generate a combined magnetic field of the magnetic fields generated by the coils 4. Accordingly, the magnet rotor 5 is rotated by an angle corresponding to the measured amount.
As a result, the rotor shaft 6 is rotated, the pointer 12 is rotated on the dial plate 10, and the measured amount is displayed.

When the coil 4 is no longer energized as in the case where the ignition switch of the automobile is turned off, the rotor shaft 6 is rotated in the direction of zeroing by the predetermined zeroing means, and the pointer 12 is moved to the predetermined direction. It is returned to the zero position.

Conventionally, such a positioning of the pointer 12 at the zero position has been performed by providing a stopper pin on the surface of the dial plate 10 and bringing the pointer 12 into contact with the stopper pin. If the stopper pin is provided on the surface of the dial plate 10, the appearance of the dial plate is impaired. Therefore, the stopper pin on the dial plate 10 is removed and the stopper pin is disposed inside the coil bobbin 3. The zero position of the pointer 12 is determined by the engagement of a stopper (not shown) and an engagement portion formed on the magnet rotor 5 side.

[0010]

By the way, in recent years, there has been an increasing demand for downsizing, especially thinning of the instrument movement 2, and in order to cope with such thinning of the instrument movement 2, the magnet rotor 5 is used. Is formed thin, and the pointer 12 is attached to the rotor shaft 6 so that the pointer 12 which is relatively heavy can be rotationally driven even when the magnet rotor 5 generates only a small rotational torque. A so-called magnet, in which the rotational force of the rotor shaft 6 is decelerated and transmitted to the drive shaft, and the rotor shaft is driven to rotate more than one rotation in order to rotate the drive shaft once. A cross-coil type indicating instrument of the type in which the rotor 5 rotates multiple times has been considered.

However, in the above-mentioned conventional cross-coil type indicator, the zero position of the pointer 12 is caused by the engagement of the stopper (not shown) provided inside the coil bobbin 3 and the engaging portion formed on the magnet rotor 5 side. Since the positioning of the magnet rotor 5 is performed,
For a multi-turn indicator that turns more than turns,
This stopper structure cannot be applied as it is, and there is a disadvantage that the zero position of the pointer 12 cannot be properly positioned.

The present invention has been made in view of the above points, and is a multi-turn type indicator instrument capable of properly positioning the pointer at the zero position without providing a stopper pin on the dial. It is an object of the present invention to provide a cross coil type indicating instrument that can be used.

[0013]

In order to achieve the above object, a cross coil type indicator according to the present invention forms a cross coil by winding two coils around a coil bobbin in a direction orthogonal to each other. A magnet rotor that rotates a predetermined angle around the rotor shaft in accordance with the combined magnetic field of the magnetic fields generated by the coils when the coils are energized is provided inside, and a pointer is attached to the tip end near the rotor shaft. In a multi-rotation type cross-coil type indicator instrument in which a drive shaft is rotatably arranged and the rotational force of the multi-rotating magnet rotor is transmitted through a reduction transmission mechanism connecting the rotor shaft and the drive shaft. A stopper for positioning the pointer at a predetermined zero position is provided on the drive shaft portion.

Preferably, the stopper is formed so that its position can be adjusted.

[0015]

According to the present invention, since the stopper is disposed on the drive shaft side, the zero position of the pointer can be positioned on the drive shaft side even when the magnet rotor is rotated many times and the rotor shaft is rotated a plurality of times. In a so-called multi-turn indicator, the pointer can be properly positioned at the zero position without providing a stopper pin on the dial.
Moreover, by forming the stopper so that the position thereof can be adjusted, the zero point position of the pointer can be surely adjusted.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described below with reference to FIGS. 1 and 2 show an embodiment of a cross-coil type indicating instrument according to the present invention. An instrument movement 2 of an instrument unit 1 includes a coil bobbin 3 formed by joining an upper bobbin 13 and a lower bobbin 14. And has this coil bobbin 3
Two coils (not shown) are wound around each other. A disk-shaped magnet rotor 5 having S and N poles is rotatably disposed inside the coil bobbin 3, and the magnet rotor 5 has an axially extending center portion. A rotor shaft 6 rotatably supported is attached to a bearing recess 7 of the lower bobbin 14. An output gear 15 that constitutes a reduction transmission mechanism is fixed to the rotor shaft 6, and the magnet rotor 5 is rotationally driven by energizing the coils based on a predetermined measurement amount to rotate the rotor shaft 6. 6 is rotationally driven.

A cylindrical bearing member 16 is integrally formed on one side of the upper bobbin 13, and a bearing recess 17 is formed on the inner bottom of the bearing member 16. Further, inside the bearing member 16, a drive shaft 18 whose lower end is axially supported by the bearing recess 17 is rotatably driven. A drive gear 19 meshed with the output gear 15 of the rotor shaft 6 is fixed to the drive shaft 18, and the gear ratio between the output gear 15 and the drive gear 19 is, for example, 1: 2. When the output gear 15 rotates twice, the drive gear 19 rotates once.

Further, as will be described later, a contact projection 20 extending in the radial direction which constitutes a zero point stopper of the pointer 12 is formed on the lower surface of the drive gear 19, and the drive gear 19 of the upper bobbin 13 is formed. A stopper 21 that abuts against the abutment projection 20 at a predetermined zero position of the drive gear 19 and blocks the rotation of the drive gear 19 is formed at a lower position of the. Further, a braking ring 22 is formed integrally with the drive gear 19 inside the bearing member 16 of the drive shaft 18, and the braking ring 22 is attached to the drive shaft 18 inside the bearing member 16. Filling agent 8 such as silicon is provided to apply a braking force therethrough to prevent unnecessary vibration of drive shaft 18.

An outer cover 23 is fitted over the upper bobbin 13 so as to cover the upper bobbin 13, and the outer cover 23 is provided at a position corresponding to the drive shaft 18 at the above position. Bearing portion 24 that supports the upper portion of the drive shaft 18
Are formed. It should be noted that the outer cover 23 may be provided with a bearing portion that axially supports the upper portion of the rotor shaft 6.

A pointer 12 is attached to the upper end of the drive shaft 18, and a hairspring 25 having one end fixed to the coil bobbin 3 side is provided near the lower side of the pointer 12 of the drive shaft 18. A mustache ball 26 wound around is attached. The urging force of the balance spring 25 causes the contact projection 20 of the drive gear 19 to engage the drive shaft 18 with the stopper 21 while the drive shaft 18 can freely rotate.
It is designed to return until it comes into contact with. Further, below the coil bobbin 3, a magnetic shielding case 9 for shielding the magnetic field is mounted.

The instrument movement 2 having the above-described structure is mounted on a printed wiring board 27 for converting a predetermined measurement signal into a drive signal, and the pointer 12 part thereof is printed on the back side of the dial of a combination meter (not shown). It is designed to be stored so that it is located on the front side of the board,
The combination meter equipped with the instrument movement 2 is attached to an instrument panel of a vehicle such as an automobile.

Next, the operation of this embodiment will be described.
In this embodiment, by applying a predetermined voltage as a drive signal based on a predetermined measurement signal to each of the coils, the magnet rotor 5 is measured according to the combined magnetic field of the magnetic fields generated by the coils. Rotate the angle corresponding to the amount. In this magnet rotor 5, one coil of the cross coil is Vcos θ, and the other coil is Vs.
By applying a voltage of inθ, it is rotated by a predetermined angle θ.

In this case, in this embodiment, since the gear ratio between the output gear 15 and the drive gear 19 is formed to be 1: 2, in order to rotate the drive shaft 18 once, the rotor shaft is rotated once. 6 must be rotated twice, but the magnet rotor 5 can be rotated twice by setting the angle θ in the range of 0 to 720 °, and the first and second rotations of the magnet rotor 5 can be performed. By changing the applied voltage with and, the first rotation and the second rotation can be distinguished.

The rotation of the magnet rotor 5 drives the rotor shaft 6 to rotate.
Is transmitted to the drive shaft 18 via the output gear 15 and the drive gear 19, whereby the drive shaft 18 is rotated against the biasing force of the balance spring 25, and the pointer 12 is rotated on the dial. Then, the predetermined measurement amount is displayed. Also, turn off the ignition switch of the car.
When the coil is de-energized as in the case of F, the drive shaft 1 is driven by the urging force of the balance spring 25.
8 is rotated until the contact projection 20 contacts the stopper 21, and the pointer 12 is returned to the predetermined zero position.

At this time, in this embodiment, the rotating force of the multi-rotating magnet rotor 5 causes the rotor shaft 6 and the drive shaft 1 to rotate.
8 is transmitted through deceleration transmission mechanisms 15 and 19 that connect the magnet rotor 8 and the magnet rotor 5. Even if the rotor shaft 6 makes multiple rotations and the rotor shaft 6 makes multiple rotations, the zero position of the pointer 12 can be positioned by the zero point stoppers 20 and 21 arranged on the drive shaft 18 side. ,
The zero position of the pointer 12 can be properly positioned without providing a stopper pin on the dial.

Further, since the rotational force of the multi-rotating magnet rotor 5 is transmitted through the deceleration transmission mechanisms 15 and 19 connecting the rotor shaft 6 and the drive shaft 18, the rotor shaft 6 is rotated with a small rotational torque. In this case, the drive shaft 18 having the relatively heavy pointer 12 mounted thereon can be driven to rotate, and the pointer 12 is attached to the drive shaft 18 so that the weight of the pointer 12 on the rotor shaft 6 itself. Therefore, the friction loss in the bearing recess 7 of the rotor shaft 6 is small, and the weight hysteresis is small. As a result, the rotation torque can be reduced together with the speed reduction transmission mechanism. As a result, even when the magnet rotor 5 is driven with a small rotational torque and the rotor shaft 6 is rotationally driven, the drive shaft 18 having the pointer 12 mounted thereon can be rotationally driven, and the thickness of the magnet rotor 5 can be reduced. It can be formed, and the instrument movement 2 can be properly thinned.

Therefore, in this embodiment, the drive shaft 18
Since the stopper 21 and the abutting protrusion 20 that form the zero-point stopper of the pointer 12 are disposed on the side, even when the magnet rotor 5 rotates multiple times and the rotor shaft 6 rotates multiple times, the stopper 21 is disposed on the drive shaft 18 side. The zero position of the pointer 12 can be positioned by the zero point stoppers 20 and 21 described above. In a so-called multi-rotation indicating instrument, the zero position of the pointer 12 can be properly positioned without providing a stopper pin on the dial. be able to.

FIG. 3 shows another embodiment of the present invention. The bearing member 16 on which the drive shaft 18 is arranged is provided separately and rotatably from the upper bobbin 13. The lower end portion of the bearing member 16 projects from the lower surface of the magnetic shield case 9. Further, in this embodiment, a stopper 21 that engages with the contact protrusion 20 formed on the lower surface of the drive gear 19 is formed on the upper portion of the bearing member 16, and the other portions are the same as those shown in FIGS. It is similar to that of the embodiment shown.

Also in this embodiment, as in the above embodiment,
Abutment protrusion 20 and bearing member 1 provided on the drive gear 19
Even if the rotor shaft 6 rotates a plurality of times, the stopper 21 provided on the drive shaft 6 can position the pointer 12 at the zero position on the side of the drive shaft 18 and can properly cope with a multi-rotating indicator. it can.

Further, in this embodiment, the bearing member 1
Since 6 is rotatably formed with respect to the upper bobbin 13, the contact position between the stopper 21 and the contact projection 20 is adjusted by rotating the bearing member 16 and adjusting the position of the stopper 21. Even when the pointer 12 does not return to the zero position when the pointer 12 is returned to the predetermined zero position by the biasing force of the balance spring 25, the position adjustment of the stopper 21 ensures the zero position adjustment of the pointer 12. be able to.

Further, FIGS. 4 and 5 show another embodiment of the present invention, which is similar to that of the embodiment shown in FIG.
The bearing member 16 is formed integrally with the upper bobbin 13, and in the present embodiment, a stopper piece 28 having a substantially fan shape is formed by the pin 29 near the bearing member 16 of the upper bobbin 13. It is attached so that it can rotate around. At the base of the stopper piece 28, a locking projection 30 that abuts the abutment projection 20 formed on the drive gear 19 is formed upright, and the arc piece of the stopper piece 28 has the stopper piece 28. A gear portion 31 for rotating the gear is formed.

In this embodiment, the stopper piece 28
The abutting protrusion 20 of the drive gear 19 abuts on the locking protrusion 30 of No. 1 to position the pointer 12 at the zero position, and in this embodiment, the jig and the stopper piece 28, not shown. By engaging the gear portion 31 and operating the jig to rotate the stopper piece 28 around the pin 29, the position of the locking projection 30 with respect to the contact projection 20 can be adjusted.

In this case, in this embodiment, since the center of rotation of the stopper piece 28 is close to the locking projection 30, even if the gear piece 31 is operated to rotate the stopper piece 28, Since the amount of rotation of the locking projection 30 is small, the locking projection 30 can be finely adjusted in position.

Therefore, also in this embodiment, the drive shaft 18
The abutting projection 20 and the stopper piece 28 provided as a zero point stopper on the side can position the pointer 12 at the zero position in the multi-rotation indicator, and the stopper piece 28 can be rotated to perform positioning. The zero point position of the pointer 12 can be surely adjusted.

6 and 7 show still another embodiment of the present invention, in which a guide groove 32 extending outward is formed in the vicinity of the bearing member 16 of the upper bobbin 13.
Inside the guide groove 32, a long stopper slider 33 is slidably arranged along the guide groove 32. At the tip of the stopper slider 33, a locking protrusion 34 is formed which is brought into contact with the contact protrusion 20 of the drive gear 19, and the side surface of the stopper slider 33 is provided with a jig (not shown). A gear portion 35 for slidingly operating the stopper slider 33 is formed by the engagement. Further, on the side surface of the stopper slider 33, there is integrally formed a spring piece 36 which is pressed against the inner side surface of the guide groove 32 and holds the stopper slider 33 at a predetermined position.

Also in this embodiment, as in the above-described respective embodiments, the contact projection 20 of the drive gear 19 abuts on the locking projection 34 of the stopper slider 33, thereby positioning the pointer 12 at the zero position. The position of the locking projection 34 with respect to the contact projection 20 can be adjusted by sliding the stopper slider 33.

In this case, in this embodiment, when the contact projection 20 contacts the locking projection 34 due to the rotation of the drive gear 19, the force in the rotational direction of the drive gear 19 is applied to the stopper slider 33. However, in reality, since the component force of the rotational force of the contact projection 20 in the guide groove 32 direction is applied to the stopper slider 33, the force is small and the stopper slider 33 follows the guide groove 32. It is possible to reliably hold the position of the zero point stopper that has been set once, without moving outward.

Therefore, also in this embodiment, the drive shaft 18
The contact projection 20 and the stopper slider 33 provided as a zero point stopper on the side can position the pointer 12 at the zero position in the multi-rotation indicator, and the stopper slider 33 can be slid to operate. Guideline 12
The zero point position adjustment can be reliably performed. The present invention is not limited to the above embodiments, but can be variously modified as necessary.

[0039]

As described above, in the cross-coil type indicator according to the present invention, the stopper is arranged on the drive shaft side. Therefore, even when the magnet rotor rotates many times and the rotor shaft rotates a plurality of times. The zero position of the pointer can be positioned on the drive shaft side, and in the so-called multi-rotation indicating instrument, the zero position of the pointer can be properly positioned without providing a stopper pin on the dial. . Also,
By forming the stopper so that its position can be adjusted, the zero point position of the pointer can be surely adjusted.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing an embodiment of a cross coil type indicator according to the present invention.

FIG. 2 is a plan view of FIG.

FIG. 3 is a vertical sectional view showing another embodiment of the present invention.

FIG. 4 is a vertical sectional view showing still another embodiment of the present invention.

FIG. 5 is a plan view of FIG.

FIG. 6 is a vertical sectional view showing another embodiment of the present invention.

FIG. 7 is a plan view of FIG.

FIG. 8 is a vertical cross-sectional view showing a conventional cross-coil type indicating instrument.

[Explanation of symbols]

 1 instrument unit 2 instrument movement 3 coil bobbin 5 magnet rotor 6 rotor shaft 7 bearing recess 8 filler 12 pointer 13 upper bobbin 14 lower bobbin 15 output gear 16 bearing member 17 bearing recess 18 drive shaft 19 drive gear 20 contact protrusion 21 stopper 22 Braking ring 23 Outer cover 24 Bearing part 25 Beard spring 28 Stopper piece 30 Locking protrusion 33 Stopper slider 34 Locking protrusion

Claims (2)

[Claims] 1. A cross coil is formed by winding two coils around a coil bobbin in directions orthogonal to each other.
Inside this cross coil, a magnet rotor that rotates a predetermined angle around the rotor shaft in accordance with the combined magnetic field of the magnetic fields generated by the coils by energizing each coil is arranged,
A drive shaft having a pointer attached to the tip end is rotatably disposed near the rotor shaft, and the rotational force of the multi-rotating magnet rotor is transmitted through a speed reduction transmission mechanism that connects the rotor shaft and the drive shaft. In the multi-rotation type cross-coil type indicator instrument, a stopper for positioning the pointer at a predetermined zero position is provided on the drive shaft portion. 2. The cross coil type indicating instrument according to claim 1, wherein the stopper is formed so that its position can be adjusted.