JPS6217713Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a crossed coil type meter, and particularly to a crossed coil type meter in which a plurality of crossed coil indicators are actuated by a signal from one detector.

Automobiles, ships, etc. are equipped with detectors such as resistance conversion elements that convert physical quantities such as temperature, pressure, and fuel levels into electrical signals in order to display engine temperature, pressure, and fuel levels. Cross-coil meters are often used, which consist of a cross-coil indicator whose pointer rotates in response to electrical signals from the meter.
The indicator of this type of crossed coil type instrument consists of a permanent magnet fixed to a pointer shaft, and three coils wound around the permanent magnet in three directions perpendicular to the pointer shaft. The coils are connected as shown in the circuit diagram of FIG. Coil 1 is wound in the X-axis direction, coil 2 is coaxial with coil 1 and wound in the opposite direction, coil 3 is wound in the Y-axis direction, and each coil 1, 2, 3 is a resistance converter that is a detector. When connected in a bridge shape including element 4, and current flows, a composite magnetomotive force is generated by coils 1 and 2 on the X axis, and a magnetomotive force is generated by coil 3 on the Y axis, resulting in perpendicular magnetomotive force. The direction of the composite magnetic field is determined by the combination of , and the pointer is moved by rotating the permanent magnet in that direction. That is, the resistance value of the resistance conversion element 4 changes due to a change in the physical quantity, and the current value flowing through the coil due to this change in resistance value is expressed by the following equation (1) derived from the equivalent circuit of FIG. 1 shown in FIG. ，
The direction of the composite magnetic field changes based on (2), and the pointer moves in accordance with the direction of the composite magnetic field.

I ₁ = R ₂ /R ₂ +r・I ₀ …(1) I ₂ =r/R ² +r・I ₀ …(2) Here, I ₀ ; Current flowing through battery E I ₁ ; Flowing through resistance conversion element 4 Current I ₂ ; Current flowing through coil 2 and coil 3 R ₂ ; Combined resistance by coil 2 and coil 3 r; Resistance (variable) in resistance conversion element 4 By the way, when a crossed coil type meter is installed on a construction machine vehicle, a ship, etc. In this case, the resistance conversion element 4
It is normal practice to install a cross-coil indicator in the engine, etc., and a cross-coil indicator in the driver's cab. However, in recent years, as construction machinery vehicles and ships have become larger and the engine room and driver's cab have become farther apart, it has become extremely difficult to adjust the engine using only the instruments in the driver's cab. It is becoming common practice to install indicators. Similar operations are also performed between the self-propelled driver's cab and the working driver's cab in large vehicles, and between the driver's cab and the auxiliary driver's cab on the roof deck of ships.

In such a case, a cross-coil type instrument consisting of a detector and an indicator may be installed separately in both chambers, but this would make the product expensive and there may not be enough space to install the detector. Therefore, as shown in FIG. 3, it is advantageous to connect two crossed coil type indicators 5 to one resistance conversion element 4 so that the resistance conversion element 4 can be shared.

However, if this is done, the following equations (3) and (4) will be derived from the equivalent circuit of FIG. 3 shown in FIG.

I ₁ ′=R ₂ /R ₂ +2r・I ₀ ′ …(3) I ₂ ′=r/R ₂ +2r・I ₀ ′ …(4) Here, I ₀ ′; Current flowing through battery E I ₁ ′ Current I ₂ ' flowing through resistance conversion element 4; Current flowing through coil 2 and coil 3. Also, the current flowing through coil 1 is I ₀ '/2
becomes.

In comparison with equations (1) and (2), the previous equations (3) and (4) show that when two crossed coil indicators 5 are connected to one resistance conversion element 4, the current flows through the resistance conversion element 4. This shows that the current and the current flowing through both coils 2 and 3 are reduced compared to when one cross-coil type indicator 5 is connected to one resistance conversion element 4. This means that two crossed coil indicators 5, which were adjusted to connect one crossed coil indicator 5 to one resistance converting element 4, can be connected as they are to one resistance converting element 4. This means that a new cross-coil type indicator must be manufactured separately, as the accurate value cannot be indicated even if the value is specified.

However, this approach has the drawback of complicating the assembly work and making the product expensive as a whole.

This invention eliminates the drawbacks of the conventional ones as described above, and connects a plurality of crossed coil stop indicators, each of which is adjusted in index, to one resistance conversion element, and connects them to one resistance conversion element. It is an object of the present invention to provide a cross-coil type meter that can be connected to a device and display multiple accurate readings at the same time.

This invention will be explained with reference to the embodiments shown in FIGS. 5 and 6.

Since most of this embodiment is constructed in the same way as that shown in FIG. 3, the same reference numerals as those in FIG. 3 will be given to those parts, and the explanation will be omitted, and the parts that have a different structure will mainly be explained. explain.

Both coils 2 and 3 of two crossed coil type indicators 5 are connected in parallel to one resistance conversion element 4, and an auxiliary resistance R ₃ having the same size as the combined resistance of these coils 2 and 3 is connected to each of them. Connect in series to coil 3. Further, each coil 1 of both crossed coil indicators 5, 5 is connected to a battery E.

FIG. 6 shows an equivalent circuit of the circuit shown in FIG.
From this equivalent circuit, the following equations (5) and (6) are established.

I ₁ ″=R ₂ +R ₃ /R ₂ +R ₃ +2r・I ₀ ″=R ₂ /R
₂ +r・I ₀ ″…(5) I ₂ ″=r+/R ₂ +R ₃ +2r・I ₀ ″=r/R ₂ +r・
I ₀ ″/2 (6) where, I ₀ ″: Current flowing through battery E I ₁ ″: Current flowing through resistance conversion element 4 I ₂ ″: Current flowing through coil 2 and coil 3. A current of I ₀ ″/2 flows through both coils 1.

Comparing Equation (6) with Equation (2) above, the currents flowing through the coils 2 and 3 correspond to each other at a ratio of 1/2. The current flowing through coil 1 also corresponds to the ratio of 1/2. Therefore, in the case shown in FIG. 5, the combined magnetomotive force due to coils 1, 2, and 3 is equal to
The direction of the combined magnetomotive force of 3 is equal and the magnitude is small, and the pointers of both crossed coil indicators 5 are both 1
one cross coil indicator 5 for each resistance conversion element 4
It will indicate the same indicated value as the pointer indicates when connected to.

FIG. 7 shows another embodiment, which includes:
Three cross-coil indicators 5 are connected in parallel to one resistance conversion element 4, and each coil 2, 3 of these cross-coil indicators 5, indicated by a resistor _R2 in the figure, An auxiliary resistor R ₄ (=2R ₂ ) twice as large as the resistor R ₂ is connected in series.

In this example as well, the following equation (7) and I ₀ in coil 1
Since a current of /3 flows, an accurate indicated value is indicated in the same manner as in the embodiments shown in the fifth and sixth figures.

I ₂ =r/R ₂ +R ₄ +3r・I ₀ =r/R ₂ +r・I
₀ /3...(7) Here, I ₀ : Current flowing through battery E I ₀ : Current flowing through coil 2 and coil 3.

In the above, a crossed coil indicator 5 consisting of three coils, namely coils 1, 2 and 3;
However, the present invention is not limited thereto, and it goes without saying that the indicator may be a cross-coil type indicator consisting of two coils or four or more coils.

Since this device is configured as described above, a plurality of crossed coil type indicators can be operated by an electric signal from one detector, and these crossed coil type indicators can be activated by a single detector. The cross-coil type indicator with index adjustment can be used as it is as a unit that is connected to the device, and has excellent effects such as being able to provide an extremely economical product as a whole.

[Brief explanation of the drawing]

Figure 1 is a circuit diagram of a conventional crossed coil meter.
Figure 2 is an equivalent circuit diagram of the same as above, Figure 3 is a circuit diagram of another conventional crossed coil type meter, Figure 4 is an equivalent circuit diagram of the same as above, Figure 5 is a circuit diagram of an embodiment of this invention, FIG. 6 is an equivalent circuit diagram of the same as above, and FIG. 7 is a circuit diagram of another embodiment of this invention. 1, 2, 3... Coil, 4... Resistance conversion element,
5...Cross coil type indicator.

Claims (1)

[Scope of utility model registration request] At least one coil of a plurality of crossed coil type indicators 5 is connected in parallel to one detector 4 that emits an electrical signal of a level corresponding to a change in a physical quantity, and a resistor is further connected to each of the coils. A cross-coil type meter connected in series so that each cross-coil type indicator 5 indicates an indication value according to a signal from the detector 4.