JP2001099867A - Measuring instrument - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a low-cost measuring instrument which meets required accuracy according to measuring items. SOLUTION: The apparatus for indicating a plurality of measuring items with use of needles 111, 121, 131, 141 comprises instrument bodies 114, 124, 134, 144 for driving the needles 111, 121, 131, 141. The instrument bodies 114, 124, 134, 144 are each for driving the needles 111, 121, 131, 141 according to the rotation of a magnet 2. Among the instrument bodies 114, 124, 134, 144, the instrument bodies 114, 124 usable for measuring items requiring high indication accuracies have gear units 13 to be gear reduction mechanisms for gear- reduction-driving the needles 111, 121, and the instrument bodies 134, 144 usable for measuring items not requiring high indication accuracies are to drive the needles 131, 141 at an equal speed to that of the magnet 2, without providing the gear units 13.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a so-called combination meter which displays various measurement items such as a vehicle speed and an engine speed by using a plurality of meters.

[0002]

2. Description of the Related Art Conventionally, this kind of meter device has been disclosed in
No. 2,216,735, and Japanese Patent Application Laid-Open No. 8-178703. This instrument device includes a speedometer, engine tachometer, fuel gauge, and water temperature gauge.
Various measurement items are indicated using the cross-coil instrument main body.

[0003]

In recent years, among the measurement items of an instrument device, for a measurement item having a large angle of change such as a main instrument such as a speedometer or an engine tachometer that has a large change.
The demand for the indicating accuracy is high, and the situation is not easily met by the conventional cross-coil instrument main body.

[0004] Therefore, a speedometer, which requires high pointing accuracy,
It is considered that a stepping motor type instrument main body is used for the instrument main body of measurement items such as an engine tachometer, and a conventional cross coil type instrument main body is used for a fuel gauge and a water temperature gauge. However, in this configuration, the control methods cannot be unified because the types of the instrument main bodies are different, and inconveniences such as an inconsistent production of the instrument main bodies occur.

[0005] Therefore, it is conceivable that the entire instrument body is a stepping motor instrument body. However, in this configuration, an expensive stepping motor having high indicating accuracy is used for measurement items that do not require high indicating accuracy as compared with a speedometer or an engine tachometer. The inconvenience that the service cannot be provided will occur.

Accordingly, the present invention has been made to solve the above-mentioned conventional problems, and an object of the present invention is to provide an inexpensive instrument device that satisfies the required accuracy according to a measurement item.

[0007]

In order to achieve the above object, the present invention provides an instrument device having a plurality of instrument bodies for driving a pointer according to rotation of a magnet, wherein the instrument body has a speed reduction mechanism. And a meter main body that drives the pointer at a lower speed than the magnet and a meter main body that does not have the speed reduction mechanism and drives the pointer at a constant speed with the magnet.

The instrument main body is composed of a bobbin case in which a magnet is rotatably mounted on a rotating shaft, and a coil wound on one side of the bobbin case so as to cross each other. is there.

Further, the speed reduction mechanism is a gear unit having a gear and an eccentric shaft, which is configured to be detachable.

Further, the bobbin case of the instrument main body has the same shape.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The instrument device 100 of the present invention is for indicating and displaying a plurality of measurement items using hands 111, 121, 131, 141.
Instrument main bodies 114, 12 for driving 1, 131, 141
4,134,144. Each of the plurality of instrument bodies 114, 124, 134, 144 has hands 111, 121, 131,
141 for driving a plurality of instrument bodies 114 and 12
Of the instruments 4, 134, 144, the meter bodies 114, 124 used for measurement items requiring high instruction accuracy are provided with a gear unit 13 which is a reduction mechanism for reducing gears, and the hands 111, 121 are decelerated more than the magnet 2. The instrument units 134 and 144 that are driven and used for measurement items that do not require high pointing accuracy include a gear unit 1.
3, the pointers 131 and 141 are driven at the same speed as the magnet 2. With this configuration,
Speedometer 110 and engine tachometer 1 that require high accuracy of indication
Measurement items such as 20 can be indicated with high accuracy. In addition, the measurement items that require high precision in the same instrument body do not require much accuracy, without increasing the types of the instrument body depending on whether or not the gear unit 13 is attached to the instrument body. Therefore, the inexpensive instrument device 100 can be provided.

The instrument main body is wound around a bobbin case 1 in which a magnet 2 is rotatably mounted on a rotating shaft 5 and is biased in a V-shape on each side of the bobbin case 1 so as to cross each other. And coils 6 and 7. With this configuration, the gear unit 1
Even when 3 is attached to the bobbin case 1, the thickness in the direction of the rotating shaft 5 can be suppressed, and the thickness of the instrument main body can be suppressed, thereby providing an instrument device with a reduced thickness.

A gear unit 13 as a speed reduction mechanism includes a transmission gear 12 and an eccentric shaft 11 and is configured to be detachable. With this configuration, it is possible to provide an instrument device that can easily perform an operation of attaching the gear unit 13 to the bobbin case 1.

The bobbin case 1 of the instrument body has the same shape. With such a configuration, by using the same bobbin case 1 for the instrument main body, an increase in the number of types of components can be suppressed, and an inexpensive instrument device can be provided.

[0015]

1 to 8 show a typical embodiment of an instrument device according to the present invention. An instrument device 100 includes an instrument for displaying various measurement items such as a vehicle speed and an engine speed. In this embodiment, a speedometer 110, an engine tachometer 120, a fuel gauge 130, and a water temperature gauge 140 are provided. These instruments are provided with hands 111, 121, 131,
141 is used as an indicator 113, 123, 133, 14 such as a scale provided on each of the dials 112, 122, 132, 142.
By reading in contrast to 3, each measurement item is instructed and displayed. Note that 114, 124, 134, and 14 shown in FIG.
Reference numeral 4 denotes an instrument main body that drives the hands 111, 121, 131, and 141.

Each dial 112, 122, 132, 142
Is a return plate 150 provided on the front of the instrument device 100.
At the windows 151, 152, 153, 154. In FIG. 1, reference numeral 160 denotes a warning display section, which alerts a plurality of items such as a seat belt warning and a handbrake warning by turning on a light source (not shown). Reference numeral 170 denotes an odometer that displays the total mileage, 171 denotes a trip meter that can reset the mileage display, and 172 denotes a trip meter 1
It is a rod-shaped reset knob for resetting the display distance of 71 to zero. 180 is a clock composed of a liquid crystal display,
Reference numeral 181 denotes a rod-shaped operation knob for adjusting the display time of the clock.

The instrument main body 11 of the instrument device 100 of the present embodiment.
4, 124, 134, and 144 will be described with reference to FIGS. In addition, the speedometer 110 and the engine tachometer 120,
Since the fuel gauge 130 and the water thermometer 140 have the same instrument body, the instrument body will be described with respect to the engine tachometer 120 and the water thermometer 140. First, the engine tachometer 12
The instrument main body 124 used for 0 will be described. The instrument main body 124 includes a resin bobbin case 1. The resin bobbin case 1 includes an upper bobbin case 1a and a lower bobbin case 1b.
Legs 4a, 4b beside the interior part 3 which rotatably accommodates
And the bobbin case 1 with respect to the rotating shaft 5.
The coils 6 and 7 are biased so as to be substantially orthogonal to each side of
Is wound. The bobbin case 1 is housed in a cylindrical, bottomed metal shield case 29.

The winding positions of the coils 6, 7 around the bobbin case 1 are defined by the legs 4a, 4b and the bearing 9 of the rotating shaft 5 of the upper bobbin case 1a.
Is arranged on one side of the rotary shaft 5 in a substantially V-shape that is substantially orthogonal so that the crossing portion is located on the opposite side of the eccentric shaft 11 described later with the rotary shaft 5 interposed therebetween. As a result, an empty portion is formed on the side of the rotating shaft 5 opposite to the side on which the coils 6 and 7 are wound, and the rotation of the magnet 2 is controlled by the magnetic fields of the coils 6 and 7 deviated from the center of rotation. Are orthogonal to each other on the rotation axis 5 and do not affect the control of the magnetic field direction at all. The rotational torque of the magnet 2 by the magnetic force can be sufficiently obtained by adjusting the magnetizing strength of the magnet 2 and the wire diameters and the number of turns of the coils 6 and 7. be able to. Further, the coils 6 and 7 are wound around each side of the bobbin case 1 so as to cross each other so that a gear unit 13 described later can be connected to the bobbin case 1.
The thickness of the instrument main body 124 in the direction of the rotation axis 5 can be suppressed even when the instrument device 1 is attached to the instrument body 1, and the instrument device 1 with a reduced thickness can be provided. A fixed magnet 30 is provided in a portion of the lower bobbin case 1b close to the interior portion 3 so as to keep the magnet 2 at a predetermined position when the magnets 2 are rotatable without energization of the coils 6 and 7. Have been.

Terminals 8 for supplying signals to the coils 6 and 7 are mounted on the legs 4a and 4b of the bobbin case 1. In this embodiment, it is a linear pin-shaped terminal inserted into a hole penetrating in the vertical direction of the legs 4a, 4b. The lower end side of the terminal 8 is formed in a male terminal structure, is inserted into a through hole 191 of a hard printed board 190 made of a glass epoxy resin disposed below, and is configured to be connectable with a solder 192. Note that the upper end of the terminal may be bent toward the rotation shaft 5 to prevent the terminal from projecting upward. The instrument main body 124 is fixed to the circuit board 190 by using a not-shown claw provided on the shield case 29 with the circuit board 190.
Is fixed by inserting it into a through-hole (not shown) provided in the above. However, you may fix using another method.

A rotary gear 10 is fixed to the end of the rotary shaft 5 exposed from the bobbin case 1. The bobbin case 1 has a gear unit 13 having an eccentric shaft 11 and a transmission gear 12 in a vacant portion formed by the winding structure of the coils 6 and 7. The transmission gear 12 meshes with the rotary gear 10 and is fixed to the eccentric shaft 11. A pointer 121 is fixed to an end of the eccentric shaft 11. The pointer 121 and the index portion of the dial 122 perform a comparison reading and indicate a measured value. Here, since the number of teeth of the rotating gear 10 is smaller than the number of teeth of the transmission gear 12, the eccentric shaft 11 is driven at a reduced speed from the rotating shaft 5. Therefore, the pointer 121 can be driven with high accuracy. The gear unit 13 includes an upper gear unit main frame 13a and a lower gear unit main frame 13 made of synthetic resin.
The eccentric shaft 11 is rotatably supported by the upper gear unit body frame 13a and the lower gear unit body frame 13b.

As shown in FIGS. 6 to 8, the gear unit 13 has a lower gear unit body frame 13b provided with a C-shaped wall portion 14 on the lower gear unit main frame 13b. The case 1 is arranged along the side surface 15. In addition, the bobbin case 1, especially the lower bobbin case 1
A locking portion 17 having a hole 16 is formed on the side surface 15 of b (see FIG. 3). Gear unit 13 has locking claw 1
The elastic piece 19 provided with the elastic piece 8 is formed.
The gear unit 13 can be fixed to the bobbin case 1 by inserting the 9 into the hole 16 and locking the locking claw 18 to the locking portion 17. In addition, since the gear unit 13 is configured to be detachable, the work of attaching the gear unit 13 to the bobbin case 1 can be easily performed.

Reference numeral 20 denotes a positioning pin projecting from the gear unit 13, and a cylindrical portion 2 provided on the bobbin case 1.
1 to determine the positions of the gear unit 13 and the bobbin main body 1. In this embodiment, the gear unit 13 is detachable. However, the gear unit 13 may be welded after assembling to make it impossible to detach.

As shown in FIG. 4, the transmission gear 12 has a groove 22 on the upper surface 12a. The upper gear unit body frame 13a has a protrusion 23 located in the groove 22.
It has. The groove 22 is not formed in a perfect circular shape on the upper surface 12a of the transmission gear 12, and the eccentric shaft 1 is so formed that the rotation of the eccentric shaft 11 can be stopped at a desired position.
It is formed in an arc shape with 1 as the center. This eccentric shaft 1
By providing one rotation restricting portion 24 in the gear unit 13, the rotation of the pointer 121 fixed to the eccentric shaft 11 can be restricted directly. Also, since the convex portion 23 is located in the groove 22, the upper gear unit main body frame 13a
And the transmission gear 12 in the direction of the eccentric shaft 11 can be reduced in thickness.

In this embodiment, the rotation restricting portion 24 is formed in the upper gear unit main frame 13a and the transmission gear 12, but the groove 22 is provided on the lower surface of the transmission gear 12, and the projection 23 is formed in the lower gear unit main frame. 13b. Further, a projection is provided on the transmission gear 12, and the gear unit body frame 13 is provided.
A groove may be provided in either one of a and 13b.

The eccentric shaft 11 is provided with a biasing means comprising a hairspring 26. This hairspring 26 has one end fixed to the eccentric shaft 11 with a mustache ball 27,
The other end is fixed to a fixing portion 28 provided integrally with the upper gear unit body frame 13a. The hairspring 26 applies a force to the eccentric shaft 11 so that the eccentric shaft 11 always rotates counterclockwise even if the eccentric shaft 11 rotates clockwise, for example. Thus, the eccentric shaft 11 always has the hairspring 26
By applying a force in a predetermined direction,
The gear teeth of the rotary gear 10 and the transmission gear 12 are always in contact with each other, and there is no play due to the play between the teeth, and thus, it is possible to give an instruction without rattling of the hands, that is, wobble. .

The engine tachometer 120 and the speedometer 1
Reference numeral 10 denotes a rotating shaft 5 to which the magnet 2 is fixed and a pointer 12
An eccentric shaft 11 to which the shafts 111 are fixed is eccentrically provided in a side-by-side state, and a gear unit 13 for reducing the speed of both shafts is provided.
By rotating 21, 111, the pointing error can be mechanically suppressed.

Next, the instrument main body 144 used for the water temperature gauge 140 will be described. The instrument main body 144 has substantially the same structure as the instrument main body 124 of the engine tachometer 120,
The different parts are that the bobbin case 1 does not include the gear unit 13 and that the rotary shaft 5 does not include the rotary gear 10, and the other parts have the same structure. The material of the bobbin case 1 and the number of turns of the coils 6 and 7 are the same. It should be noted that the indicator 141 is used for the engine tachometer 12.
Since the height of the rotary shaft 5 and the eccentric shaft 11 is different from the height of the pointer 121, the bosses 125 and 145 of the pointers 121 and 142 are different from each other.
The lengths of the dials 122, 142
Can have the same height. When it is not necessary to make the heights of the dials 122 and 142 the same between the engine tachometer 120 and the water temperature gauge 140, the bosses 125 and 14 are used.
There is no need to change the length of the five.

With this configuration, it is possible to accurately indicate measurement items such as the speedometer 110 and the engine tachometer 120, which require a high degree of accuracy, and to determine whether a gear unit is attached to the instrument body. Depending on whether
It is possible to provide an inexpensive instrument device because it can be applied to measurement items requiring high accuracy in the same instrument body and measurement items that do not require much accuracy without increasing the type of instrument body. it can.

The instrument body is divided into a measurement item requiring high accuracy and a measurement item not requiring much accuracy.
The bobbin case 1 can be made the same even if the number of turns of the coil and the like are changed, so that the parts cost of the bobbin case 1 can be reduced.

[0030]

As described above, according to the present invention, an initial object can be achieved, and an inexpensive instrument device can be provided while satisfying required accuracy according to a measurement item.

[Brief description of the drawings]

FIG. 1 is a front view of an instrument device according to the present invention.

FIG. 2 is a cross-sectional view of an essential part of an A-A line in FIG. 1, particularly an engine tachometer and a water temperature meter.

FIG. 3 is a top view of the cross-coil instrument main body of the embodiment.

FIG. 4 is a sectional view of an essential part taken along line BB in FIG. 3;

FIG. 5 is a top view of the cross-coil instrument main body with the gear unit of the embodiment removed.

FIG. 6 is a side view of the gear unit as viewed from the direction of arrow C in FIG. 3;

FIG. 7 is a side view of the gear unit as viewed from the direction of arrow D in FIG. 3;

FIG. 8 is a sectional view taken along line EE in FIG. 7;

[Explanation of symbols]

 Reference Signs List 1 bobbin case 2 magnet 5 rotating shaft 6, 7 coil 11 eccentric shaft 12 transmission gear 13 gear unit 100 instrument device 110 speedometer 111, 121, 131, 141 hands 114, 124, 134, 144 instrument main body 120 engine tachometer 130 fuel Total 140 water temperature gauge

Claims (4)

[Claims] 1. An instrument device comprising a plurality of instrument bodies for driving hands according to rotation of a magnet, wherein the instrument body has a deceleration mechanism and drives the hands at a lower speed than the magnet. A meter device which does not have the deceleration mechanism, and is constituted by an instrument main body which drives the pointer and the magnet at a constant speed. 2. The instrument main body comprises a bobbin case in which a magnet is rotatably mounted by a rotating shaft, and a coil wound around one side of the bobbin case so as to intersect each other. 2. The instrument device according to 1. 3. The instrument device according to claim 1, wherein the speed reduction mechanism is a gear unit that includes a gear and an eccentric shaft and is configured to be detachable. 4. The instrument device according to claim 2, wherein said bobbin case of said instrument body has the same shape.