JPH0731069B2 - Instrumentation - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an instrument device.

[Prior Art] Japanese Patent Application Laid-Open No. 1-277718 discloses a drive device for rotating a meter shaft according to an input signal, a self-luminous pointer having a discharge tube that emits light when energized, and a meter shaft as a starting point. An instrument device is disclosed that includes two conductive hair springs that urge in the returning direction and a rotating member that is fixed to a meter shaft.

The rotating member is composed of a pointer boss for fixing the self-luminous pointer to the meter shaft, two terminals for supplying electric power to the discharge tube, and an insulator for insulating the two hair springs. The two terminals are connected to the inner peripheral ends of the two hair springs, and electric power is supplied from the two hair springs.

When the rotating member and the two hair springs are assembled to the meter shaft, the two hair springs are assembled to the rotating member and then the rotating member is assembled to the meter shaft. The free ends of the two hair springs are connected to the two power supply terminals attached to the fixing member to conduct electricity to the power source and fix the outer ends.

[Problems to be Solved by the Invention] However, in the conventional one, when the insulator assembly in which the inner peripheral end of the hair spring is assembled to the rotating member is driven into the meter shaft to be assembled, the outer peripheral end of the hair spring is Since the part was not fixed, the outer edge of the hair spring was unstable and wobbled.

In this way, if the hairspring whose outer peripheral end is not fixed is fixed to the meter shaft, the angle of the outer peripheral end of the hairspring with respect to the meter shaft may be slightly deviated from the predetermined angle. It was In addition, since the angle of the outer peripheral end of the hair spring greatly contributes to the pointing accuracy of the self-luminous pointer, there is a possibility that the pointing accuracy of the self-luminous pointer may be reduced due to the deviation of the angle.

An object of the present invention is to provide an instrument device that prevents the pointer pointing accuracy from being lowered by locking the outer peripheral end of the spiral spring when the rotating member is assembled to the rotating shaft.

[Means for Solving the Problem] A measuring device according to the present invention includes a pointer for indicating a physical quantity such as a speed, a liquid amount, or a temperature, and a rotating shaft for rotating the pointer.
The spiral spring is provided on the outer circumference of the rotary shaft, and has a spiral spring that urges the rotary shaft to return to the starting point, and support means that supports the inner peripheral end of the spiral spring. A rotating member assembled to the rotating shaft in a state of being attached to the supporting means, wherein the rotating member has locking means for locking the outer peripheral end portion of the spiral spring when assembled to the rotating shaft. Adopted the technical means to have.

[Operation] When the rotating member is assembled to the rotating shaft with the inner peripheral end of the spiral spring supported by the supporting means, the outer peripheral end of the spiral spring is locked by the locking means provided on the rotating member. By,
The outer peripheral end of the spiral spring is prevented from wobbling, and the angle of the outer peripheral end of the spiral spring becomes a predetermined angle with respect to the rotation axis.

[Effect of the Invention] Since the angle of the outer peripheral end of the spiral spring can be assembled at a predetermined angle with respect to the rotating shaft, the pointer pointing accuracy can be improved. Therefore, the physical quantity such as the speed, the liquid quantity, or the temperature can be accurately displayed by the pointer.

[Embodiment] An instrument device of the present invention will be described based on an embodiment shown in Figs. 1 to 17.

FIG. 1 is a diagram showing an insulator assembly, and FIGS. 2 and 3 are diagrams showing an engine tachometer.

The engine tachometer 1 is a measuring instrument device of the present invention, and includes a drive device 2, a pointer assembly 3, an insulator assembly 4,
A fixture plate assembly 5 and an instrument panel 6 on which the engine speed is displayed are provided.

The drive device 2 includes a metal case 21, a cross coil 22, a meter shaft 23, and a resin support member 24. The case 21 has a bowl shape, the cross coil 22 is housed inside, and the support means 24 is fixed to the outer peripheral edge. The cross coil 22 rotates the meter shaft 23 by a predetermined amount according to the amount of energization. The meter shaft 23 is
The rotary shaft of the present invention, one end of which is rotatably disposed in the cross coil 22 and rotates integrally with the pointer assembly 3 and the insulator assembly 4. The support member 24 fastens the fixer plate assembly 5 with screws or the like.

4 and 5 are views showing the pointer assembly 3.

The pointer assembly 3 includes a self-luminous pointer 31, a pointer fixing device 32,
And one and the other first terminals 33, 34.

As shown in FIGS. 6 and 7, the self-luminous pointer 31 is composed of a discharge tube having a bulb 31a, an internal electrode 31b and an external electrode 31c.

The valve 31a has an elongated hollow rod shape and is filled with an inert gas in which xenon and neon are mixed. The outer peripheral surface of the bulb 31a is covered with a light-shielding coating 31e having a slit 31d capable of transmitting light. Valve 31a
When electric power is supplied from the internal electrode 31b and the external electrode 31c, a glow discharge is generated between the internal electrode 31b and the external electrode 31c, and the fluorescent coating 31f produces a high-luminance visible light ray.

The internal electrode 31b is arranged at the end of the bulb 31a on the axial center side, and a current is supplied via the power receiving portion 31g. External electrode 31c
Is formed by applying a conductive paste such as carbon phenol or a noble metal paste such as silver in the longitudinal direction of the outer peripheral surface of the valve 31a. A current is supplied to the external electrode 31c via the power receiving unit 31h.

The pointer fixing device 32 includes a pointer boss 32a and a pointer cover 3
2b, a weight 32c and a holding member 32d.

The pointer boss 32a is made of resin such as polysulfone, and has a cylindrical insertion portion that is fitted to the outer circumference of the tip end portion of the meter shaft 23.
32e, and a holding portion 32f which is provided so as to intersect the insertion portion 32e in the orthogonal direction and which holds the rear end portion of the self-luminous indicator 31 and has an open ring-shaped cross section.

The pointer cover 32b is fixed to the pointer boss 32e so as to cover the opening of the pointer boss 32a, and has a circular protrusion 32g on the outer circumference.

The weight 32c balances the self-luminous pointer 31. The holding member 32d includes a weight 32c and a pointer cover 32.
It is held and fixed in b.

The one and the other first terminals 33, 34 are formed of a conductive metal. The one and the other first terminals 33, 34 are substantially inverted Ω-shaped holding portions 33a, 34a for holding and fixing the power receiving portion 31h of the outer electrode 31c and the power receiving portion 31g of the inner electrode 31b of the valve 31a, and the holding portions 33a, 34a. The arm portions 33b and 34b extending from the portions 33a and 34a in the left-right direction in the drawing, and the arm portions 33b and 34b.
33b and 34b, and connecting portions 33c and 34c hanging downward in the drawing. The connecting portions 33c and 34c are provided with a pair of pressing portions 33d and 34d for surely establishing electrical continuity.

8 to 11 are views showing the insulator assembly 4.

The insulator assembly 4 is a rotating member of the present invention and has one and the other hair springs 41 and 42, one and the other first terminal pins 43 and 44, and an insulating plate (insulator plate) 45.

FIGS. 12 and 13 are views showing one hair spring 41 adopted as the spiral spring of the present invention, and FIGS. 14 and 15 are views showing the other hair spring 42.

The one and the other hair springs 41, 42 are thin plates made of conductive phosphor bronze with a thickness of about 0.04 mm, and urge the meter shaft 23 and the pointer assembly 3 in the direction of returning to the starting point. For this reason, the meter shaft 23 and the pointer assembly 3 are always returned to the starting point by a combined force of the spring force of one hair spring 41 returning to the natural length and the spring force of the other hair spring 42 returning to the natural length. To try.

Inner peripheral end portion 41 of one and the other hair spring 41, 42
a and 42a are one and the other first terminal pins 43 and 44.
Are connected to the cylindrical members 41b, 42b made of metal into which they are inserted by press fitting or caulking. Further, the one and the other hair springs 41, 42 have spiral portions 41c, 42c that are spirally wound, and outer peripheral end portions 41d, 42d that extend radially outward from the spiral portions 41c, 42c. Equipped with.

The one and the other first terminal pins 43 and 44 support and fix the inner peripheral end portions 41a and 42a of the one and the other hair springs 41 and 42, respectively. Also, the first of the one and the other
The terminal pins 43 and 44 are made of a conductive metal, one end of which is inserted into the tubular members 41b and 42b, and the other end of which is inserted into the connecting portions 33c and 34c of the first and second first terminals 33 and 34. To electrically connect the two. The one first terminal pin 43 constitutes the supporting means of the present invention.

The insulating plate 45 has an annular shape made of an insulating resin, and is arranged between the one hair spring 41 and the other hair spring 42 in order to insulate the one hair spring 41 from the other hair spring 42. It is set up. The insulating plate 45 includes a hole portion 45a into which the meter shaft 23 is inserted, one hollow boss portion 45b projecting upward from the surface in the figure, and the other hollow boss portion 45b projecting downward from the back surface in the figure. A boss portion 45c is provided. The one and the other boss portions 45b and 45c hold and fix the rear end portions of the one and the other first terminal pins 43 and 44 in a state where the tip portions of the one and the other first terminal pins 43 and 44 are projected. Is. Further, on the outer peripheral edges of the front surface and the back surface of the insulating plate 45, stoppers 45 having steps 45d and 45e respectively on the opposite side to the rotating direction of the insulating plate 45 and on the lower side in the figure.
f and 45g are projected.

The stoppers 45f and 45g are the locking means of the present invention, and the planar shape is formed in an arc shape along the outer periphery of the insulating plate 45. The side shape of the stopper 45f is substantially L-shaped, and the side shape of the stopper 45g is as shown in FIG.
It has a U-shape with a tapered surface 45h.

Further, the stoppers 45f and 45g are integrally molded with resin when the insulating plate 45 is molded. These stoppers 45f and 45g are provided on the outer peripheral end portion 41 of the one and the other hair springs 41 and 42 when the insulator assembly 4 is assembled to the meter shaft 23.
It fixes d and 42d. Also, the steps 45d and 45e are
When the insulator assembly 4 is assembled to the meter shaft 23, the outer peripheral ends of the one and the other hair springs 41 and 42
By locking 41d and 42d, the spiral portion 41c of one hair spring 41 and the spiral portion 42c of the other hair spring 42 are locked.
This is the part that keeps the insulation gap between and properly.

FIG. 16 and FIG. 17 are views showing the fixer plate assembly 5.

The fixer plate assembly 5 includes one and the other second terminals 51, 52, one and the other third terminals 53,
54, and a fixer plate 55.

The one and the other second terminals 51 and 52 are formed of a conductive metal. One and the other of the second terminals 51 and 52 have one and the other of the hair springs 41,
Insertion parts 51a, 52a are provided which are caulked with the outer peripheral end parts 41d, 42d of 42 inserted.

The fixer plate 55 includes a plate portion 55a, first and second support portions 55b and 55c hanging from the plate portion 55a,
The two supporting members 24 of the drive device 2 are provided with two mounting portions 55d that are fastened with screws or the like.

The plate portion 55a has an insertion hole 55e through which the meter shaft 23 is rotatably inserted, and a circular recess 55f formed in the outer periphery of the insertion hole 55e for accommodating the other hair spring 42. .

A method of assembling the engine tachometer 1 of this embodiment will be described with reference to FIGS. 1 to 17.

The fixer plate assembly 5 is assembled to the drive device 2, and then the fixer plate assembly 5 is assembled to the insulator assembly 4.

When assembling this insulator assembly 4 to the meter shaft 23, first, the first and the other first terminal pins 43,
Cylindrical members 41b, 42b obtained by caulking the inner peripheral end portions 41a, 42a of the one and the other hair springs 41, 42 are fixed to 44.

Then, wobbling of the outer peripheral ends 41d, 42d is prevented by locking the outer peripheral ends 41d, 42d of the one and the other hair springs 41, 42 to the stoppers 45f, 45g of the insulating plate 45.

As described above, by fixing the one and the other hair springs 41 and 42 to the insulating plate 45, the positions of the outer peripheral ends 41d and 42d of the one and the other hair springs 41 and 42 are the centers of the spiral portions 41c and 42c. Located at a predetermined angle from. at the same time,
Due to the steps 45d and 45e of the stoppers 45f and 45g, the insulating gap between the spiral portion 41c of the one hair spring 41 and the spiral portion 42c of the other hair spring 42 is maintained at an appropriate value.

After that, the meter shaft protruding from the fixer plate 55
23. The hole 45a of the insulating plate 45 of the insulator assembly 4 is press-fitted, and the insulator assembly 4 is fixed to the fixer plate assembly 5 with a fastener such as a screw.

At this time, the other hair spring 42 is arranged between the circular recess 55f of the fixer plate 55 and the insulating plate 45.

Therefore, before assembling the insulator assembly 4 to the meter shaft 23, the insulator 45 is locked by the stoppers 45f and 45g of the insulating plate 45 with the outer peripheral ends 41d and 42d of the hair springs 41 and 42, respectively. axis
After being assembled to the meter shaft 23, the outer peripheral ends 41d and 42d of the one and the other hair springs 41 and 42 can be assembled to the meter shaft 23 at a predetermined angle. Therefore, the urging force that returns the meter shaft 23 to the starting point by the one and the other hair springs 41 and 42 becomes constant between products. Therefore, since the pointing accuracy of the self-luminous pointer 31 can be improved, the self-luminous pointer 31
The engine speed can be displayed with high accuracy.

(Modification) In this embodiment, the hair springs are arranged on both sides of the insulator, but the hair springs may be arranged only on one side of the insulator. Further, in this case, the stopper (locking means) for locking the outer peripheral end of the hair spring is also provided only on the side surface on which the hair spring is arranged, that is, either the front surface or the back surface of the insulator. Becomes

In the present embodiment, the self-luminous pointer having a bulb is used as a pointer, but a self-luminous pointer having another light emitting element such as a light emitting diode may be used as a pointer, and a pointer having no light emitting element is used. Is also good.

In this embodiment, one and the other first terminal pins of the insulator assembly are used as the supporting means, but one and the other first terminals of the pointer assembly may be used as the supporting means. In this case, the inner peripheral end of the hair spring is directly joined to the first terminal by welding or the like.

Although the present invention is used in the engine tachometer in this embodiment, it may be used in a liquid meter such as a speedometer, a fuel gauge or an oil meter, a thermometer such as room temperature or oil temperature, or a hygrometer.

[Brief description of drawings]

1 to 16 show an embodiment of the present invention. FIG. 1 is a perspective view showing a disassembled insulator assembly.
2 is a sectional view showing the main part of the engine tachometer, FIG. 3 is a plan view showing the main part of the engine tachometer, FIG. 4 is a perspective view showing a disassembled pointer assembly, and FIG. 5 is a pointer. It is a figure which shows the principal part of an assembly. FIG. 6 is a plan view of the self-luminous pointer, and FIG. 7 is a plan view showing a state before the light-shielding coating of the self-luminous pointer is applied. FIG. 8 is a sectional view showing the insulator assembly, FIG. 9 is a plan view showing the insulator assembly, FIG. 10 is a rear view showing the insulator assembly, and FIG. 11 is a partial view showing the insulator assembly. 12 is a plan view showing one hair spring, FIG. 13 is a sectional view showing one hair spring, FIG. 14 is a plan view showing the other hair spring,
FIG. 15 is a sectional view showing the other hair spring. FIG. 16 is a plan view showing the fixer plate assembly, and FIG. 17 is a front view showing the fixer plate assembly. In the figure, 1 ... Engine tachometer (instrument device), 4 ... Insulator assembly (rotating member), 23 ... Meter shaft (rotating shaft),
31 …… Self-luminous pointer, 41 …… One hair spring (spiral spring), 41a …… Inner end, 41d …… Outer end, 43 …… One first terminal pin (supporting means), 45f, 45g …… Stopper (locking means)

Claims (1)

[Claims] 1. A pointer for indicating a physical quantity such as a speed, a liquid amount or a temperature, a rotary shaft for rotating the pointer, and a rotary shaft which is arranged on the outer periphery of the rotary shaft and returns the rotary shaft to a starting point. A spiral spring that urges the spiral spring in a direction, and a supporting member that supports an inner peripheral end portion of the spiral spring, and a rotating member that is assembled to the rotating shaft with the spiral spring attached to the supporting means. The instrument device, wherein the rotating member has a locking unit that locks an outer peripheral end portion of the spiral spring when the rotating member is assembled to the rotating shaft.