JPH0684370U - Vehicle indicating instrument - Google Patents

Abstract

(57) [Abstract] [PROBLEMS] To provide a vehicle indicating instrument capable of reducing a starting resistance by reducing bearings at the time of starting a rotating shaft and smoothly performing a starting operation of the rotating shaft. [Structure] A rotary shaft 5 that is rotationally driven according to a predetermined measurement amount.
And a predetermined pointer 8 is attached to the tip of the rotary shaft 5 to form a movement 1 of the indicating instrument for a vehicle. The movement 1 supports the rotary shaft 5 when the rotary shaft 5 is started. It is characterized in that the piezoelectric element 11 for giving a slight vibration is arranged in the.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a vehicle indicating instrument, and more particularly to a vehicle indicating instrument suitable for vehicle-mounted instruments such as speedometers and tachometers.

[0002]

[Prior art]

 Conventionally, a current that changes depending on the measurement amount is applied to a pair of coils that generate mutually orthogonal magnetic fields, and the magnet rotor is rotated in the direction of the combined magnetic field that combines the magnetic fields generated by the pair of coils. A cross-coil type vehicle indicating instrument that displays the measured amount by a pointer that rotates together with this magnet rotor is often used.

FIGS. 2 and 3 show such a conventional vehicle indicating instrument. A movement 1 of the vehicle indicating instrument has a coil bobbin 2 including an upper bobbin 2a and a lower bobbin 2b. Two coils 3 and 3 are wound outside the coil bobbin 2 so as to be orthogonal to each other. Inside the coil bobbin 2 around which the coils 3 and 3 are wound, a disk-shaped magnet rotor 4 having S and N poles is arranged. A rotary shaft 5 extending in the axial direction of the coil bobbin 2 is attached to the portion. A bearing recess 6 is formed in the center of the lower surface of the magnet rotor 4 housing portion of the coil bobbin 2, and the bearing recess 6 is filled with silicon 7.

By the bearing portion 6 a of the bearing recess 6, the base end portion of the rotary shaft 5 is rotatably supported and the base end portion of the rotary shaft 5 is positioned in the silicon 7. The rotation shaft 5 is braked. Further, the magnet rotor 4 is freely rotatable around the rotating shaft 5 when the coils 3 are not energized, and by energizing each of the coils 3, the magnet rotor 4 can be rotationally driven by a predetermined angle. Has been done.

A dial (not shown) is attached to the upper surface of the movement 1, and a pointer 8 is fixed to a portion of the rotary shaft 5 protruding from the dial. The instrument unit is formed by the above configuration.

In the conventional vehicle indicating instrument, by supplying a predetermined current as a drive signal based on a predetermined measurement signal to each coil 3, a combined magnetic field of the magnetic fields generated by each coil 3 is generated. Accordingly, the magnet rotor 4 or the rotary shaft 5 is rotated, and the pointer 8 is rotated on the dial to display the measured amount.

At this time, the rotating shaft 5 is rotationally driven while being applied with a braking force by the silicon 7 in the coil bobbin 2, whereby the unnecessary shaking of the rotating shaft 5, that is, the pointer 8. I try to prevent it. When the coil 3 is not energized, such as when the vehicle is stopped, the rotating shaft 5 is allowed to rotate freely, and the pointer 8 is rotated by the zeroing force by the zeroing means (not shown). It is designed to return to a predetermined zero position.

[0008]

[Problems to be solved by the device]

 However, in the conventional indicating instrument, the total weight of the rotary shaft 5 including the magnet rotor 4 and the pointer 8 acts on the bearing portion 6a of the bearing recess 6, and therefore, when the rotary shaft 5 is started. Since the starting resistance becomes large, the starting operation of the rotating shaft 5 cannot be smoothly performed, and the rotating operation of the pointer 8 at the time of starting cannot be performed smoothly. . This is particularly remarkable as the pointer 8 has become heavier in recent years by making the pointer self-luminous.

Further, in order to smoothly perform the starting operation of the rotary shaft 5, the operating torque by the coil 3 may be increased. However, in order to increase the operating torque in this way, the operation of the magnet rotor 4 is increased. Since it is necessary to increase the size and the number of windings of the coil 3, the size of the entire device increases, and the cost of parts also increases.

The present invention has been made in view of the above points, and provides a vehicle indicating instrument capable of reducing the starting resistance at the time of starting the rotating shaft and smoothly performing the starting operation of the rotating shaft. It is intended to be provided.

[0011]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, a vehicle indicating instrument according to the present invention is provided with a rotary shaft that is driven to rotate according to a predetermined measurement amount, and the base end portion of this rotary shaft is supported by a bearing portion. In a vehicle indicating instrument having a predetermined pointer attached to the tip of the rotating shaft, the vehicle indicating instrument is provided with a piezoelectric element that imparts a slight vibration to the bearing portion of the rotating shaft when the rotating shaft is started. What is done is the feature.

[0012]

[Action]

 According to the present invention, when the vehicle instrument is operated, the piezoelectric element is driven to impart a slight vibration to the bearing portion of the rotary shaft, thereby reducing the bearing resistance at the start of the rotary shaft. Thus, the starting resistance of the rotating shaft can be significantly reduced, and the starting operation of the rotating shaft can be performed smoothly.

[0013]

【Example】

 Hereinafter, an embodiment of the present invention will be described with reference to FIG. FIG. 1 shows an embodiment of an indicating instrument for a vehicle according to the present invention, which has a substantially cylindrical shape, and a movement case 10 attached to a predetermined substrate 9 has a movement 1 of the indicating instrument. Is provided, and the movement 1 has a coil bobbin 2. Two coils 3 and 3 are wound on the outer side of the coil bobbin 2 so as to directly intersect each other, and on the inner side of the coil bobbin 2, a magnet rotor (not shown) is arranged. A rotary shaft 5 extending in the axial direction of the coil bobbin 2 is attached to the center of the magnet rotor, and the base end of the rotary shaft 5 is a bearing recess formed in the lower surface of the coil bobbin 2. It is rotatably supported by a bearing (not shown).

A pointer 8 located on the surface side of a dial (not shown) is attached to the tip of the rotary shaft 5, and the rotary shaft 5 is provided inside the bearing recess of the coil bobbin 2. It is filled with a predetermined amount of silicon (not shown) for applying a predetermined braking force.

Further, in this embodiment, piezoelectric elements 11, 11, ... Are attached to the peripheral surface of the movement case 10, the tip end portion of the coil bobbin 2 and the back surface side of the substrate 9, respectively. The piezoelectric element 11 is adapted to generate a slight vibration when energized.

Next, the operation of this embodiment will be described. In the present embodiment, when operating the vehicle instrument, first, each of the piezoelectric elements 11 is driven to vibrate the movement case 10, the coil bobbin 2, and the substrate 9 slightly. As a result, a slight vibration is applied to the bearing portion of the bearing recess in which the base end portion of the rotating shaft 5 is supported, and as a result, the bearing resistance at the time of starting the rotating shaft 5 is reduced, The starting resistance can be significantly reduced.

In this state, by supplying a predetermined current as a drive signal based on a predetermined measurement signal to each coil 3, the rotating shaft 5 is rotated according to the combined magnetic field of the magnetic fields generated by each coil 3. The pointer 8 is rotated, and the pointer 8 is rotated on the dial to display the measured amount.

At this time, if the rotating shaft 5 is started, it will not be affected by the bearing resistance at the time of starting the bearing portion, so that the piezoelectric element 11 is de-energized, and the rotating shaft 5 is rotated by the coil bobbin 2. It is designed to rotate while being protected from unnecessary vibration by the silicon inside.

Therefore, in the present embodiment, when the rotary shaft 5 is started, the piezoelectric element 11 is energized to give a slight vibration to the bearing portion that supports the rotary shaft 5, so that the bearing when the rotary shaft 5 is started is started. Since the resistance is reduced, the starting resistance of the rotary shaft 5 can be reduced and the rotary shaft 5, that is, the pointer 8 can be smoothly driven with a small torque.

Although a plurality of piezoelectric elements 11 are arranged at predetermined positions in the above-mentioned embodiment, it is possible to effectively apply a slight vibration to the bearing portion that supports the rotary shaft 5. For example, the number and the location of the arrangement can be appropriately selected. Further, in the above-mentioned embodiment, the embodiment in which the cross coil type indicator is applied has been described. For example, an electromagnetic induction type indicator etc. It can be applied to any indicating instrument. Further, the present invention is not limited to the above-mentioned embodiment, but can be variously modified as needed.

[0021]

[Effect of device]

 As described above, the vehicle indicating instrument according to the present invention reduces the bearing resistance at the time of starting the rotating shaft by energizing the piezoelectric element at the time of starting the rotating shaft to slightly vibrate the bearing portion supporting the rotating shaft. Therefore, the starting resistance of the rotating shaft can be reduced, and the rotating shaft, that is, the pointer can be smoothly driven with a small torque.

[Brief description of drawings]

FIG. 1 is a front view showing an embodiment of a vehicle indicating instrument according to the present invention.

FIG. 2 is a perspective view showing a movement of a conventional vehicle indicating instrument.

FIG. 3 is a sectional view of a coil bobbin portion of a conventional vehicle indicating instrument.

[Explanation of symbols]

 1 movement 2 coil bobbin 3 coil 5 rotating shaft 6 bearing recess 6a bearing portion 8 pointer 9 substrate 10 movement case 11 piezoelectric element

Claims (1)

[Scope of utility model registration request] 1. A vehicle, comprising: a rotary shaft that is driven to rotate according to a predetermined measurement amount; a base end portion of the rotary shaft is supported by a bearing portion; and a predetermined pointer is attached to a distal end portion of the rotary shaft. In the indicating instrument, the indicating instrument for a vehicle is provided with a piezoelectric element for imparting a slight vibration to a bearing portion of the rotating shaft when the rotating shaft is started.