JPH0446213Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention relates to the improvement of indicating instruments such as speedometers and tachometers installed in automobiles, particularly indicating instruments having a rotation angle conversion point of a pointer shaft. .

[Related technology and its problems] In general, the indicating operation of the pointer of a vehicle indicating instrument is as follows:
Rotation from the vehicle is transmitted to the rotating shaft via a flexible cable, and the magnet rotates together with the rotating shaft.
The eddy current action generated by the rotational movement of the magnet is guided to the guide plate, and a rotational torque proportional to the rotation of the magnet acts on the guide plate, and the rotation of the guide plate is balanced with the elastic force of the hairspring, and the rotating shaft is The change in rotation of the pointer according to the number of rotations of the dial is measured and displayed by comparing it with the scale and numbers on the dial.

Therefore, since the rotation change according to the rotation speed of the rotating shaft is transmitted to the pointer while being balanced with the elastic force of one hair spring, the scale interval is constant with respect to the deflection angle of the pointer. .

In such cases, for example, in vehicles that are frequently used and drive at low speeds during work, such as so-called agricultural equipment such as tractors and buggies, it may not be possible to clearly read instructions at low speeds. .

In order to solve this problem, the pointer has a rotation angle conversion point so that the instruction operation range can be expanded when driving at low speeds.
As disclosed in the speedometer with speed alarm No. 19492, a pointer shaft is connected to a magnet to which the rotation from the vehicle is transmitted via a cable, etc., and a rotor that is arranged with a small gap between the magnet and the rotor. A pointer is fixed to the tip of this pointer shaft, and the rotor is rotated by the action of eddy current generated by the rotational movement of the magnet.

Further, a contact piece serving as a contact point is fixed to the pointer shaft, and the inner end of the first spiral spring is fixed to the pointer shaft, and the inner end of the second spiral spring is pivotally supported via a spring base. and the above 1st
Fix the outer end of the spiral spring to the frame side,
The contact point, which is the outer end of the second spiral spring, is placed in a standby state at the scale angle conversion point position of the display section of the dial. Therefore, the driving torque from the driving source is balanced by the restraining force caused by the elasticity of the first spiral spring, and the pointing movement of the pointer provided on the pointer shaft is performed until the scale angle conversion point of the display section of the dial plate is reached. After the scale angle conversion point, the contact piece fixed to the pointer shaft comes into contact with the contact point of the second spiral spring waiting at the scale angle conversion point position.

That is, a restraining force due to the elasticity of the first and second spiral springs is applied to the rotor, so that the pointing movement of the pointer is reduced compared to the pointing movement up to the scale angle conversion point. in this case,
The above-mentioned method allows the speed scale of the dial plate to be scaled according to the elasticity of the spiral spring acting on the rotor and the direction in the speed range where the contact point of the second spiral spring contacts the contact piece, so that the elasticity of the spiral spring can be adjusted according to the elasticity of the spiral spring acting on the rotor and the direction. This prevents the pointer from malfunctioning and shortens its contact life.

In such a case, the contact piece must be fixed to the pointer shaft inside the instrument frame, and the spring base of the second spiral spring must be pivoted, which increases the number of parts to be assembled inside the frame of the instrument body. , the efficiency of the assembly work tends to decrease.

Taking this into consideration, when the instrument body is assembled into an instrument case, it is necessary to adjust the height of the instrument body to adapt the height between the bottom wall of the instrument frame and the dial to the instrument case. It uses a pair of spacers placed between the plate and the dial, which form part of the body, and acts only in the scale operating area through this spacer, in a small space at a constant interval between the plate and the dial. A second hair spring, a lever member that rotates in conjunction with the second hair spring, a pedestal for the lever member, and a regulating portion that stops the rotation of the lever member in accordance with a scale angle conversion point are provided. It is conceivable to have a scale angle conversion point of .

In such a case, the assembly workability is improved compared to the above-mentioned one, but it is necessary to provide a pair of spacers, a lever member, a regulating part, and a pedestal for the lever member as parts. Since there are a large number of parts, there are difficulties in assembling workability due to variations in the mounting positions of each part.

[Purpose of the invention] The purpose of the invention is to solve the above-mentioned problems, and in addition to enlarging the indication operation area during low-speed driving, it also includes a spacer, a lever member, and a regulating part of this lever member. The lever member and the pedestal are integrally formed, thereby improving the efficiency of assembling the instrument body and providing a compact one-piece component.

[Summary of the invention] This invention forms the frame of an indicating instrument by installing a plate on the open end of a frame formed in a U-shape.
A dial is attached and fixed above the plate via a spacer, a rotating shaft is pivotally supported on the bottom wall of the frame, a magnet is provided at the upper end of the rotating shaft, and at least the upper end of the pointer shaft is mounted on the plate. A guide plate is provided at the bottom of the pointer shaft, which is placed with a small gap between the magnet and the magnet, and a pointer indicating the display part of the dial is fixed to the upper end of the pointer shaft. In an eddy current type indicator, which instructs the guide plate to rotate by balancing the elastic force of a hair spring by the generated eddy current action, a first indicator that acts over the entire area of the indicator scale operating area of the indicator is provided.
A second hair spring that acts on a specific area of the indication scale operating area, and a lever member that rotates in conjunction with the second hair spring are provided. A regulating portion for stopping rotation of the lever member is provided on the plate, and the second hair spring is disposed between the dial plate and the plate, wherein the first and second hair springs are arranged on the pointer shaft side. At the same time, the outer end of the first hair spring is fixed to the frame side of the instrument, and the outer end of the second hair spring is fixed to the lever member inserted into the pointer shaft side. By integrally forming the pedestal, the regulating part that stops the rotation of the lever member, and the spacer, the internal mechanism is simplified and parts can be easily attached.
Moreover, it can be constructed compactly.

[Embodiment of the invention] Figs. 1 to 4 show an embodiment of the invention. As shown in Fig. 1, a bearing member 2 is attached to the bottom of an instrument frame 1 which is bent into a U-shape. A rotary shaft 3 is rotatably supported and held through the rotary shaft 3, a magnet 4 is fixed to the upper end of the rotary shaft 3, and the rotary shaft 3 is rotationally driven by the vehicle via a flexible cable (not shown). It is formed like this. A plate 5 constituting a part of the instrument frame 1 is installed on the opening side of the instrument frame 1. An upper bearing part 6 is formed at the center of the plate 5, and a lower bearing part 6 is formed at the center of the upper end of the rotating shaft 3. A member 7 is formed, and a pointer shaft 8 is pivotally supported by both bearing members 6 and 7.

Further, a guide plate 9 is provided at the lower end of the pointer shaft 8 and is disposed with a slight gap between it and the magnet 4 fixed to the rotary shaft 3, and a pointer 10 is press-fitted and fixed at the upper end.

In addition, the inner end of the first hair spring 11 is connected to the hair ball 12.
The bar 12 is press-fitted into the pointer shaft 8, and its outer end is fixed to a bar 13 provided on the instrument frame.

Further, between the plate 5 and the dial 14, a lever member 16 whose inner end is fixed to a bead 15, this bead 15 is press-fitted and fixed to the pointer shaft 8, and its outer end is inserted through the pointer shaft 8. A second hair spring 17 is provided which is fixed to.

Further, between the plate 5 and the dial 14, there is a spacer portion 18 for adjusting the height between the bottom wall of the frame 1 of the instrument body and the dial 14, a pedestal 19 for the lever member 16, and a pedestal 19 for the lever member 16. A mounting member 21 is provided which is integrally formed with a stopper portion 20 for stopping the rotation of the shaft.

Therefore, as shown in Figures 3 and 4, the dial 1
The instruction operation of the pointer 10 until reaching the scale angle conversion point A on the display section 14a of No. 4 transmits the rotation from the vehicle to the rotating shaft 3 via the flexible
At the same time, the magnet 4 rotates, and the eddy current action generated by the rotational movement of the magnet 4 is guided to the induction plate 9.
A rotational torque proportional to the rotation of the magnet 4 acts on the guide plate 9, and this rotational torque of the guide plate 9 is balanced with the elastic force of the first hair spring 11 to cause the rotation of the pointer 10 in accordance with the rotation speed of the rotating shaft 3. The angular rotation change is measured and displayed by comparing it with a display section 14a such as a scale or numbers on the dial plate 14.

In this case, the lever member 16 and the second hair spring 1
7 is making an angular rotation movement together with the pointer shaft 8.

In addition, in the pointing operation of the pointer 10 after the scale angle conversion point A, a rotational torque proportional to the rotation of the magnet 4 acts on the guide plate 9, which further causes the pointer shaft 8 to perform an angular rotational movement. Lever member 1 provided in
The pointer shaft 8 makes an angular rotation movement while the pointer 6 contacts the stopper portion 20.

That is, the first and second hair springs 11 and 17
A restraining force due to elasticity is applied to the pointer shaft 8, and the operation instruction range of the pointer 10 in this case is set to a state in which both the first and second hair springs 11 and 17 act.

Therefore, since the instruction operation up to the scale angle conversion point A is operated only by the restraining force of the first hair spring 11, the rotation angle is instructed to be enlarged compared to the instruction operation after the scale angle conversion point A.

Note that the scale on the display section 14a of the dial plate 14 is graduated at an angle δ larger than the reference angle θ after the scale angle conversion point A, with the scale angle conversion point A as the border. When the member 16 separates from the stopper part 20 and the stress of the second hair spring 17 is no longer applied, the rotation angle of the pointer shaft 8 increases, so the angle δ is added to the reference angle θ by this decreased angle. It is set to the value.

By the way, until the lever member 16 comes into contact with the stopper part 20, that is, the scale angle conversion point A (for example, 30 km/n) of the display part 14a of the dial plate 14.
Until then, the lever member 16 is connected to the second hair spring 17.
At the same time, the angular rotation movement can be performed reliably in synchronization with the angular rotation movement of the pointer shaft 8 and in balance with the elastic force of the second hair spring 17, so that even if there is vibration of the vehicle, blind movement of the lever member 16 is prevented. can be suppressed.

Therefore, the timing of contact between the lever member 16 and the stopper section 20, that is, the scale angle conversion point A, can always be maintained at a constant timing, so that the indicating operation corresponding to the scale of the indicator 14a on the pointer 10 and the dial 14 can be performed. It will be obtained in a stable state.

Incidentally, the scale angle conversion point A can be arbitrarily set by changing the press-fitting direction of the bead 15 supporting the second bead spring 17 with respect to the pointer shaft 8.

Further, as shown in FIG. 5, the lever member 16 may be
The length may be made longer so that it comes into contact with the spacer portion 18.

Further, it is possible to form spacer portions 18 with various heights and select the appropriate height when adjusting the height. Further, since the mounting member 21 collectively serves as the spacer 18, the pedestal 19 of the lever member 16, and the regulating portion of the lever member 16, the number of parts can be reduced and the assembly workability can be improved.

[Effects of the invention] The invention forms a frame of an indicating instrument by constructing a plate at the open end of a frame formed in a U-shape.
A dial is attached and fixed above the plate via a spacer, a rotating shaft is pivotally supported on the bottom wall of the frame, a magnet is provided at the upper end of the rotating shaft, and at least the upper end of the pointer shaft is mounted on the plate. A guide plate is provided at the bottom of the pointer shaft, which is placed with a small gap between the magnet and the magnet, and a pointer indicating the display part of the dial is fixed to the upper end of the pointer shaft. In an eddy current type indicator, which instructs the guide plate to rotate by balancing the elastic force of a hair spring by the generated eddy current action, a first indicator that acts over the entire area of the indicator scale operating area of the indicator is provided.
A second hair spring that acts on a specific area of the indication scale operating area, and a lever member that rotates in conjunction with the second hair spring are provided. A regulating portion for stopping rotation of the lever member is provided on the plate, and the second hair spring is disposed between the dial plate and the plate, wherein the first and second hair springs are arranged on the pointer shaft side. At the same time, the outer end of the first hair spring is fixed to the frame side of the instrument, and the outer end of the second hair spring is fixed to the lever member inserted into the pointer shaft side. By integrally forming the pedestal, the regulating part that stops the rotation of the lever member, and the spacer, the workability of assembling the instrument body is improved, and variations in the accuracy of the mounting position of the mounting member are suppressed. It is possible to provide an indicating instrument in which switching is made stable when the lever member and the regulating portion come into contact with each other, and the operation of the pointer is stable.

In addition, visibility can be improved by enlarging the instruction activation area especially when agricultural equipment such as tractors and buggies are frequently used when traveling at low speeds.

[Brief explanation of drawings]

Figures 1 to 4 show a first embodiment of the present invention, with Figure 1 being a sectional view and Figure 2 being a perspective view of the main parts.
FIG. 3 is a plan view showing the operating state of the main parts, FIG. 4 is a plan view showing the operating state of the hands on the dial, and FIG. 5 is a plan view of the main parts showing another embodiment. DESCRIPTION OF SYMBOLS 1... Instrument frame, 3... Rotating shaft, 4... Magnet, 5... Plate, 8... Pointer shaft, 9... Guide plate, 10... Pointer, 11... First hair spring, 1
4... Dial board, 14a... Display section, 16... Lever member, 17... Second hair spring, 18... Spacer section, 19... Pedestal, 20... Stopper section.

Claims (1)

[Scope of utility model registration request] A plate is installed at the open end of the U-shaped frame to form the frame of the indicator, a dial is attached and fixed above the plate via a spacer, and a rotating shaft is attached to the bottom wall of the frame. is pivoted,
A magnet is provided at the upper end of the rotating shaft, the upper end side of the pointer shaft is pivotally supported on at least the plate, and a guide plate is provided at the bottom of the pointer shaft, which is disposed with a small gap between the magnet and the pointer shaft. A pointer indicating the display part of the dial is fixed to the upper end, and the guide plate is balanced with the elastic force of the hair spring and instructed to rotate by the eddy current action generated by the rotational movement of the magnet,
A first hair spring that acts over the entire area of the indicator scale operation area of the instrument, a second hair spring that acts on a specific area of the indicator scale operation area, and a lever member that rotates in conjunction with the second hair spring. and
A regulating portion for stopping rotation of the lever member in correspondence with a scale angle conversion point in the specific area is provided on the plate, and the second hair spring is disposed between the dial plate and the plate, The inner ends of the first and second hair springs are fixed to the pointer shaft side, the outer end of the first hair spring is fixed to the frame side of the instrument, and the outer end of the second hair spring is fixed to the pointer shaft side. 1. An indicating instrument, characterized in that a pedestal of the lever member which is fixed to the inserted lever member, a regulating portion for stopping rotation of the lever member, and the spacer are integrally formed.