JPH0650772A - Master and slave meter - Google Patents

Abstract

PURPOSE:To provide a master and slave meter wherein its structure is simple and it can be manufactured at low costs. CONSTITUTION:A main pointer 18 is attached to the tip part of a rotor shaft 5 for a magnet rotor 4, an output gear 6 is arranged and installed, a driving gear 12 which is engaged with the output gear is provided near the rotor shaft, a driving shaft 11 in which an auxiliary pointer 21 is attached to the tip part is arranged and installed so as to be freely rotatable. The main pointer 18 is turned and driven on a main dial 17 and the auxiliary pointer 21 is turned and driven on an auxiliary dial 20.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a parent-child meter, and more particularly to a parent-child meter mounted on an automobile or the like and suitable for a meter such as a fuel gauge.

[0002]

2. Description of the Related Art Generally, there is known a parent-child meter in which one measured amount is displayed by two pointers having different indication ranges. There is known a parent-child meter in which an auxiliary pointer moves on another dial with the scale of the remaining portion enlarged after moving to a predetermined position.

[0003]

However, in the above-mentioned conventional parent-child meter, for example, two cross coil movements are provided according to each of the main pointer and the auxiliary pointer, and the driving force of each movement is transmitted to each pointer. Since each pointer is driven to rotate, it is necessary to provide two movements, which increases the number of parts of the entire meter, which has the disadvantage of increasing the cost. Since two movements are driven based on one measurement amount and two hands are driven separately, it is necessary to control the two movements so that the two hands drive in synchronization. It is difficult and has the disadvantage that the entire meter is complicated.

The present invention has been made in view of the above points, and an object thereof is to provide a parent-child meter which has a simple structure and can be manufactured at low cost.

[0005]

In order to achieve the above object, the parent-child meter according to the present invention is provided with one drive source for driving according to a predetermined measurement amount, and the drive source displays the predetermined measurement amount. It is characterized in that it connects two guidelines.

[0006]

According to the present invention, since one drive source is provided and two pointers for displaying a predetermined measurement amount are connected to this drive source,
It is possible to drive the two hands in synchronization with one drive source, and it is not necessary to provide a movement for driving the hands for each hand.

[0007]

Embodiments of the present invention will be described below with reference to FIGS. 1 and 2 show an embodiment of a parent-child meter according to the present invention. The instrument movement 2 of the instrument unit 1 has a coil bobbin 3 formed by joining an upper bobbin 3a and a lower bobbin 3b. Two coils (not shown) are wound around the coil bobbin 3 so as to be orthogonal to each other. A disk-shaped magnet rotor 4 having S and N poles is rotatably disposed inside the coil bobbin 3, and a central portion of the magnet rotor 4 extends in the axial direction. A rotor shaft 5 is attached, and further, on the upper part of the rotor shaft 5,
The large-diameter output gear 6 is fixed.

A bearing recess 7 for supporting the rotor shaft 5 is formed in the center of the lower surface of the magnet bobbin 3b housing portion of the lower bobbin 3b. It is filled with a filler 8 such as silicon for applying a braking force to prevent unnecessary shake of the rotor shaft. The magnet rotor 4 is freely rotatable around the rotor shaft 5 when the coils are not energized, and can be rotated by a predetermined angle by energizing the coils. ing.

A cylindrical bearing member 9 is integrally formed on one side of the upper bobbin 3a, and a bearing recess 10 is formed on the inner bottom of the bearing member 9.
Further, inside the bearing member 9, a drive shaft 11 having a lower end supported by the bearing recess 10 is rotatably driven. A small-diameter drive gear 12 meshing with the output gear 6 of the rotor shaft 5 is fixed to the drive shaft 11, and the gear ratio between the output gear 6 and the drive gear 12 is, for example, that of the output gear 6. The rotation speed is increased and the drive gear 12
Is set to be transmitted to. A braking ring 13 is formed integrally with the drive gear 12 on the inner side of the bearing member 9 of the drive shaft 11, and the braking ring 13 is attached to the drive shaft 11 inside the bearing member 9. Filling agent 8 is provided to apply a braking force therethrough to prevent unnecessary vibration of the drive shaft 11.

An outer cover 14 is fitted over the upper bobbin 3a so as to cover the upper bobbin 3a, and the rotor shaft 5 and the drive shaft 11 of the outer cover 14 are fitted.
Bearing portions 15 and 16 that support the upper portions of the rotor shaft 5 and the drive shaft 11 are formed at the positions corresponding to.

Further, above the outer cover 14, there is disposed a main dial plate 17 as a fuel gauge which has, for example, 1/1 to 1/4 characters and a scale 17a formed on its surface. A main pointer 18 located on the surface side of the main dial 17 is attached to the tip of the rotor shaft 5 penetrating the main dial 17. Further, above the main pointer 18, letters graduations 20a of 1/4 to 0 are formed on the surface, and an auxiliary dial plate 20 having a window portion 19 through which the pointer main body 18a portion of the main pointer 18 can be visually recognized. Is installed,
At the tip of the drive shaft 11 which penetrates through the auxiliary dial 20, the auxiliary needle which is located on the surface side of the auxiliary dial 20 and which is arranged so as to overlap with the main pointer 18 is an auxiliary needle for a long hand. A pointer 21 is attached. further,
Above the auxiliary pointer 21, a dial plate 23 having a window portion 22 through which the pointer main body 18a portion of the main pointer 18 and the pointer main body 21a portion of the auxiliary pointer 21 can be visually recognized is arranged.

The auxiliary pointer 21 of the drive shaft 11 is also provided.
A beard mainspring (not shown) as a means for zeroing is mounted on the lower side of the coil. The biasing force of the beard mainspring energizes each coil as if the ignition switch of the car was turned off. The main pointer 18 and the auxiliary pointer 21 are returned to the zero-returning direction in a state where the rotor shaft 5 and the drive shaft 11 can freely rotate. Further, below the coil bobbin 3, a magnetic shield case 24 for blocking the magnetic field is mounted.

Next, the operation of this embodiment will be described.
In the present embodiment, the instrument unit 1 is housed inside a combination meter (not shown) as, for example, a fuel gauge, and this combination meter is attached to an instrument panel of an automobile or the like.

Then, in the cross coil type instrument movement 2 of the instrument unit 1, by supplying a predetermined current as a drive signal based on a predetermined measurement signal to each coil, the magnetic field generated by each coil is reduced. The magnet rotor 4 is rotated by an angle corresponding to the measured amount according to the synthetic magnetic field, and the rotor shaft 5 serving as an output shaft is rotated.
Is rotated to rotate the main pointer 18 on the main dial 17 to display a predetermined measurement amount. Further, the rotational force of the rotor shaft 5 is transmitted to the drive shaft 11 via the output gear 6 and the drive gear 12, whereby the drive shaft 11
Is rotated, the auxiliary pointer 21 is rotated on the auxiliary dial 20, and a predetermined measurement amount is displayed.

At this time, in the present embodiment, the rotation speed of the rotor shaft 5 is increased by the gear ratio between the output gear 6 and the drive gear 12, and is transmitted to the drive shaft 11. The deflection angular velocity of the auxiliary pointer 21 attached to the tip of the drive shaft 11 is larger than that of the main pointer 18 attached to the tip of the shaft 5, and the main pointer 18
The swinging direction of is opposite to the swinging direction of the auxiliary pointer 21. Then, as shown in FIG. 2, the main hands 18 and the auxiliary hands 21 are attached to the rotor shaft 5 and the drive shaft 11 so that the angles formed by the main hands 18 and the auxiliary hands 21 become a predetermined angle. When the main pointer 18 moves to the 1/4 scale part of 17, the auxiliary dial 20
Auxiliary pointer 21 appears on the 1/4 scale part of and the main pointer 18 disappears from the main dial 17 and
The auxiliary pointer 21 can be moved toward the zero scale portion on the enlarged auxiliary dial 20.

Therefore, in this embodiment, the rotational force of the rotor shaft 5 which is rotationally driven by the rotation of the magnet rotor 4 is transmitted to the drive shaft 11 so that the rotor shaft 5 and the drive shaft 11 are attached to the respective tip portions thereof. Main guide 18 and auxiliary guide 2
1 can be rotationally driven, and two pointers (main pointer 18 and auxiliary pointer 21) can be synchronously driven and rotated by one drive source (magnet rotor 4 rotating in the synthetic magnetic field direction). . As a result, the above-mentioned main guideline 18
Also, it is not necessary to provide a movement for rotationally driving each pointer for each auxiliary pointer 21, the number of parts of the entire meter can be significantly reduced, and the cost of the entire meter can be suppressed. Further, since the driving force of one driving source is transmitted through the transmission mechanism (the output gear 6 and the driving gear 12) and the two hands are rotationally driven, the two hands reliably rotate in synchronization. It will be driven, like when rotating the two pointers with separate movements,
It is not necessary to control each movement so that the two hands rotate in synchronization, and the entire meter can be simply constructed.

FIG. 3 shows another embodiment of the present invention, in which the rotor shaft 5 is provided with a small-diameter output gear 6, and a large-diameter drive gear 12 meshing with the output gear 6 is provided. Are provided on the drive shaft 11. Further, on the upper surface of the outer cover 14 between the rotor shaft 5 and the drive shaft 11, a pointer shaft 27, which is supported by a bearing portion 26 on the upper surface of the outer cover and has a main pointer 18 attached to its tip, is rotatable. The indicator shaft 27 is provided with an output gear 28 provided on a protruding end portion of the upper surface of the outer cover 14 of the rotor shaft 5, and the indicator shaft 27, and meshes with the output gear 28. The rotating force of the rotor shaft 5 is transmitted by the driving gear 29 that operates. The gear train 28 on the pointer shaft 27 side,
The gear ratio of 29 is approximately 1: 1 and the gear trains 28 and 29 make the main pointer 18 and the auxiliary pointer 21 swing in the same direction. The other parts are almost the same as those in the above embodiment.

In the present embodiment, the rotation speed of the rotor shaft 5 is transmitted to the pointer shaft 27 almost as it is, and the rotation speed is reduced and transmitted to the drive shaft 11. The deflection angular velocity of the auxiliary pointer 21 can be made smaller than that of the pointer 18, and the main pointer 18 and the auxiliary pointer 2
The shake direction can be the same as that of 1.

Therefore, also in this embodiment, it is possible to rotate two pointers in synchronization with one drive source, and it is necessary to provide a movement for rotating each pointer for each of the main pointer 18 and the auxiliary pointer 21. The number of parts of the entire meter can be remarkably reduced, and the cost of the entire meter can be suppressed. Further, since the driving force of one driving source is transmitted through the transmission mechanism and the two pointers are rotationally driven, the two pointers are surely synchronized and rotationally driven, and the two pointers are rotationally driven. It is not necessary to control each movement so that the two hands rotate in synchronism, as in the case where the movements are driven by separate movements, and the entire meter can be easily configured. The deflection directions of the two pointers can be the same.

FIGS. 4 and 5 show a modification of the embodiment shown in FIG. 3, in which the pointer shaft 27 and the drive shaft 11 are arranged on both sides of the rotor shaft 5 as the center, and the respective shafts are arranged. 27,
11 is connected to the rotor shaft 5 by gear trains 28, 29 and 6, 12, respectively, and the main pointer 18 and the auxiliary pointer 21 are attached to the tip ends of the shafts 27 and 11, respectively, and the pointers 18 and 21 cooperate with each other. The main dial 17 and the auxiliary dial 20 that work are arranged.

In this way, the main pointer 18 and the auxiliary pointer 21 are arranged so as to be distributed to the left and right, so that the main unit 18 and the auxiliary pointer 21 are arranged so as to overlap each other. The whole can be made thinner.

The present invention is not limited to the above-described embodiments, but can be variously modified as necessary. In each of the above-mentioned embodiments, incomplete teeth are formed between the gears in the gear train. If a part is provided, the other pointer can be stopped at a predetermined position while one pointer rotates to a certain angle, and then the other pointer can be rotationally driven in synchronization with the one pointer. Further, the drive source for rotationally driving the output shaft (rotor shaft 5) can be a drive source other than the cross coil movement.

[0023]

As described above, in the parent-child meter according to the present invention, one driving source is provided, and two pointers for displaying a predetermined measurement amount are connected to this driving source. Since it is possible to drive two pointers in synchronization, it is not necessary to provide a movement for driving each pointer, the number of parts of the entire meter can be significantly reduced, the cost of the entire meter can be suppressed, and the cost can be reduced. It can be manufactured. Moreover, since the driving force of one driving source is transmitted through the transmission mechanism and the two hands are driven to rotate,
The two pointers will now reliably rotate in synchronization,
It is no longer necessary to control each movement to rotate the two hands in synchronization, as in the case where the two hands are driven to rotate by separate movements, and the structure of the entire meter can be easily configured. There is an effect such as being able to.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing an embodiment of a parent-child meter according to the present invention.

FIG. 2 is a plan view of a dial portion of FIG.

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

FIG. 4 is a longitudinal sectional view of an essential part showing a modified example of the embodiment of FIG.

5 is a plan view of the dial portion of FIG.

[Explanation of symbols]

 1 instrument unit 2 movement for instrument 3 coil bobbin 4 magnet rotor 5 rotor shaft 6,28 output gear 11 drive shaft 12,29 drive gear 14 outer cover 17 main dial 18 main pointer 20 auxiliary dial 21 auxiliary pointer 27 pointer shaft

Claims (6)

[Claims] 1. A parent-child meter characterized in that one drive source for driving in accordance with a predetermined measurement amount is provided, and two pointers for displaying the predetermined measurement amount are connected to the drive source. 2. The parent-child meter according to claim 1, wherein each of the hands is connected to a drive source so that the moving amount of the one hand is different from the moving amount of the other hand. 3. The parent-child meter according to claim 1, wherein the one pointer is directly connected to the drive source, and the other pointer is connected to the drive source through a gear coupling. 4. The parent-child meter according to claim 1, wherein the two pointers are both connected to the drive source via a gear coupling. 5. The parent-child meter according to claim 1, wherein the two pointers are arranged so as to overlap each other when viewed from the viewing side. 6. The parent-child meter according to any one of claims 1 to 4, wherein the two pointers are arranged so as to be distributed from the viewing side.