JPH0446212Y2 - - 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.

In addition, 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 due to the elasticity of the first spiral spring, and the indicating 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, a contact piece fixed to the pointer shaft comes into contact with a 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.

However, in the above case, the second contact piece is in contact with the contact piece.
The inner end of the spiral spring is fixed to a rotatable spring base, and the contact point on the outer end is in a standby state at the end, so the spring base tends to move blindly when the vehicle is vibrating, especially when the vehicle is swaying sideways. This may have an adverse effect on the operation of the dial, causing the hands to perform movements that do not correspond to the scale of the display on the dial, resulting in malfunction of the hands.

[Purpose of the invention] The purpose of this invention is to solve the above-mentioned problems.In addition to enlarging the indication operation area when driving at low speeds, the invention also includes a lever member inserted through the pointer shaft that makes contact with this lever member. This is to improve the switching when contacting the coil spring.

[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 rotating shaft is pivotally supported on the bottom wall of the frame, a magnet is provided at the upper end of the rotating shaft, at least the upper end side of the pointer shaft is pivotally supported on the plate, and a guide plate is disposed with a small gap between the magnet and the magnet. is provided at the bottom of the pointer shaft, and a pointer indicating the display part of the dial is fixed to the upper end of the pointer shaft, and the above guide plate is balanced with the elastic force of the hair spring by the eddy current action generated by the rotational movement of the magnet. In an eddy current type indicator that is configured to give rotation instructions by rotating the indicator, a hair spring used over the entire area of the indicator scale operation area and a coil spring that acts on a specific area of the indicator scale operation area are provided, An end of the coil spring is fixed to the instrument frame side, an inner end of the hair spring is fixed to the pointer shaft side, one end of the coil spring is fixed to the plate, and the other end is fixed to the scale conversion point of the specific area. By providing an engaging part on the pointer shaft that cooperates with the other end of the coil spring and makes contact only in the specific area, and by providing the coil spring and the engaging part between the dial and the plate, the lever Even when the member is exposed to vehicle vibrations, switching when the lever member and coil spring come into contact can be performed in a stable state, and the indication movement between the pointer and the scale on the dial plate is stable, making it easy to read. It can be improved.

[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 via 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, above the plate 5, a dial plate 10 is attached and fixed with screws 11 while maintaining a constant distance from the plate 5 via a pair of spacers 9.

Furthermore, a guide plate 12 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 13 is press-fitted and fixed at the upper end.

In addition, the inner end of the first hair spring 14 is connected to the hair ball 15.
The bead 15 is press-fitted and fixed to the pointer shaft 8, and its outer end is fixed to a bead holder 16 provided on the plate 5.

Further, between the plate 5 and the dial 10, a coil spring 18 having a rising portion 18a with one end fixed on the plate 5 and the other end bent.
A lever member 20 is fixed to the pointer shaft 8 via a connecting member 19.

Further, a rising portion 18a at the other end of the coil spring 18 is provided on the plate 5 in correspondence with a scale angle conversion point A provided on the display portion 21 of the dial plate 10.

Note that 22 is a position regulating portion at the other end of the coil spring 18, and 20a is an engaging portion that comes into contact with the rising portion 18a of the coil spring 18.

Therefore, as shown in Figures 3 and 4, the dial 1
The instruction operation of the pointer 13 until it reaches the scale angle conversion point A of the display section 21 of 0 transmits the rotation from the vehicle to the rotating shaft 3 through the flexible member, and the magnet 4 rotates together with the rotating shaft 3. The eddy current action generated by the rotational movement of 4 is guided to the guide plate 12,
The rotation torque proportional to the rotation of the magnet 4 is applied to the guide plate 12.
The rotational torque of the guide plate 12 is balanced with the elastic force of the first hair spring 14 to change the angular rotation of the pointer 13 according to the rotational speed of the rotating shaft 3 on the dial 1.
The measurement is displayed by comparing it with the display section 21 such as a 0 scale or numbers.

In this case, the lever member 20 is making an angular rotation movement together with the pointer shaft 8.

In addition, in the pointing operation of the pointer 13 after the scale angle conversion point A, a rotational torque proportional to the rotation of the magnet 4 acts on the guide plate 12, which causes the pointer shaft 8 to further rotate angularly. While the engaging portion 20a of the lever member 20 provided on the lever member 20 contacts the rising portion 18a of the coil spring 18, the pointer shaft 8 further rotates angularly.

That is, a restraining force due to the elasticity of the hair spring 14 and the coil spring 18 is applied to the pointer shaft 8, and the operation instruction range of the pointer 13 in this case is set to a state in which both the hair spring 14 and the coil spring 18 act.

Therefore, since the instruction operation up to the scale angle conversion point A is activated only by the restraining force of the hair spring 14, 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 21 of the dial 10 is at an angle δ larger than the reference angle θ after the scale angle conversion point A before the scale angle conversion point A.
This is because when the lever member 20 separates from the rising portion 18a of the coil spring 18 and the stress of the coil spring 18 is no longer applied, the rotation angle of the pointer shaft 8 increases, so the angle δ decreases. Only the angle is set to a value added to the reference angle θ.

By the way, the lever member 20 is connected to the coil spring 1.
8, that is, until the scale angle conversion point A (for example, 30 km/n) on the display section 21 of the dial 10, the lever member 20 synchronizes with the angular rotation movement of the pointer shaft 8 and ensures the angular rotation. can perform dynamic movements.

Therefore, the timing of contact between the lever member 20 and the rising portion 18a of the coil spring 18, that is, the scale angle conversion point A, can always be maintained at a constant timing, so that it corresponds to the scale of the indicator 21 on the pointer 13 and the dial 10. The commanded motion can be obtained in a stable state.

In addition, by providing the coil spring 18, the lever member 20, and the position regulating portion 22 at the other end of the coil spring 18 in a small space within a fixed interval between the plate 5 and the dial 10 via the spacer 9, it is possible to assemble the instrument body. The properties become better.

Note that the scale angle conversion point A can be arbitrarily set by changing the direction in which the lever member 20 is fixed with respect to the pointer shaft 8.

[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 rotating shaft is pivotally supported on the bottom wall of the frame, a magnet is provided at the upper end of the rotating shaft, at least the upper end side of the pointer shaft is pivotally supported on the plate, and a guide plate is disposed with a small gap between the magnet and the magnet. is provided at the bottom of the pointer shaft, and a pointer indicating the display part of the dial is fixed to the upper end of the pointer shaft, and the above guide plate is balanced with the elastic force of the hair spring by the eddy current action generated by the rotational movement of the magnet. In an eddy current type indicator that is configured to give rotation instructions by rotating the indicator, a hair spring used over the entire area of the indicator scale operation area and a coil spring that acts on a specific area of the indicator scale operation area are provided. An end of the coil spring is fixed to the instrument frame side, an inner end of the hair spring is fixed to the pointer shaft side, one end of the coil spring is fixed to the plate, and the other end is fixed to the scale conversion point of the specific area. By providing an engaging part on the pointer shaft that cooperates with the other end of the coil spring and makes contact only in the specific area, and providing the coil spring and the engaging part between the dial and the plate, It is possible to operate in a stable switching state when the lever member and coil spring come into contact, and it is also possible to assemble each part such as the coil spring and lever member using the gap between the plate and the dial. This has the advantage that the overall configuration can be summarized in a compact manner.

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 the drawing]

1 to 4 show an embodiment of the present invention, in which FIG. 1 is a sectional view, FIG. 2 is a perspective view of the main parts, and 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 pointer on the dial. 1...Instrument frame, 3...Rotating shaft, 4...Magnet, 5...Plate, 8...Pointer shaft, 10...Dial board, 12...Guidance plate, 13...Pointer, 14...
Coil spring, 20... lever member, 21... display section.

Claims (1)

[Scope of utility model registration request] A plate is installed at the open end of a frame formed in a U-shape to form a frame of the indicator, 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 pivotally supported on the plate, and a guide plate is provided at the lower part of the pointer shaft, which is placed through a small gap from the magnet, and the upper end of the pointer shaft is a pointer that indicates the display part of the dial. In an eddy current type indicator, in which the guide plate is fixed and the eddy current generated by the rotational movement of the magnet is used to instruct the rotation of the guide plate in balance with the elastic force of the hair spring, the entire area of the indicator scale operation area is A hair spring used across the range and a coil spring acting on a specific area of the indicator scale operating area are provided, the outer end of the hair spring is fixed to the instrument frame side, and the inner end of the hair spring is fixed to the pointer shaft side. , one end of the coil spring is fixed on the plate, the other end is waited in correspondence with the scale conversion point of the specific area, and an engaging part is linked with the other end of the coil spring to make contact only in the specific area. is provided on the pointer shaft, and the coil spring and the engaging portion are provided between the dial and the plate.