JPH0446214Y2 - - 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 induction member, and a rotational torque proportional to the rotation of the magnet acts on the induction member, and the rotation of the induction member is balanced with the elastic force of the hairspring, thereby 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 a case, for example, in a vehicle that is frequently used and travels at low speeds, such as a tractor or a buggy, it may not be possible to read instructions well when traveling 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, until the scale angle conversion point of the display section of the dial, the driving torque from the driving source is balanced by the restraining force due to the elasticity of the first spiral spring, and the pointing operation of the pointer provided on the pointer shaft is performed. 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.

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.

In consideration of this point, as shown in Utility Application No. 1981-81405, which was previously proposed by the applicant, the small space between the plate that constitutes a part of the frame of the instrument and the dial. , a second hair spring that acts only in the scale operating region, a lever member that rotates in conjunction with the second hair spring, a pedestal of the lever member, and a rotation of the lever member corresponding to the scale angle conversion point. It is conceivable to have a scale angle conversion point provided with a regulating part for stopping the movement.

In this case, the lever member is rotatably inserted into the pointer shaft while being in surface contact with the pedestal fixed on the plate, until the lever member contacts the regulating part, that is, until the scale angle conversion point. During this period, the lever member receives friction from the pedestal side, and the pointer shaft performs an angular rotation operation in balance with the elastic force of the second hair spring. As a result, there are still aspects that tend to affect the pointer's instructions, such as a decrease in the responsiveness of the pointer when driving at low speeds.

[Purpose of invention]

The purpose of this invention is to solve the above-mentioned problems, and it enlarges the indication operation area when driving at low speeds, stabilizes the indication of the pointer, and facilitates the work of assembling parts to the instrument body. It has been made possible to do so.

[Summary of the idea]

In this invention, a plate is installed at the open end of a frame formed in a U-shape to form a frame of an indicating instrument.
Attach and fix the dial above the plate,
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 guiding member 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-mentioned guiding member 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 indicating instrument configured to give a rotation instruction by rotating the indicator, a first hair spring that acts over the entire area of the indicator scale operating area of the instrument, and a second hair spring that acts on a specific area of the indicator scale operating area are provided. , a lever member that rotates in conjunction with the second hair spring is provided, and a pedestal through which the lever member can be rotatably inserted is provided, and the lever member is moved in accordance with the scale angle conversion point of the specific area. A regulating portion for stopping the rotation of the instrument is provided between the plate and the dial, the inner end of the first hair spring is fixed to the pointer shaft side, and the outer end thereof is fixed to the frame side of the instrument, The inner end of the second hair spring is fixed to the pedestal side, and the outer end thereof is fixed to a lever member inserted into the pedestal side, and the pedestal of this lever member is press-fitted and fixed to the pointer shaft. This simplifies the installation of parts to the instrument body, and allows smooth rotation of the lever member to maintain good indication of the pointer.

[Example of idea]

1 to 4 show an embodiment of the present invention. As shown in FIG. 1, a rotating shaft 3 is connected to the bottom of an instrument frame 1 which is bent into a U-shape through a bearing member 2. is rotatably supported and held, a magnet 4 is fixed to the upper end of this rotating shaft 3, and the rotating shaft 3 is configured to be rotationally driven by the vehicle via a flexible cable (not shown). . 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 member 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, the T-shaped pedestal 14 includes a pedestal portion 14a on which the lever member 15 is placed, and a pedestal portion 14a on which the lever member 15 is placed.
The lever member 15 is rotatably inserted through the shaft portion 14b and placed on the stand portion 14a. 2 mustache spring 1
6 is disposed, and a mustache ball 17 to which the inner end of the second hairspring spring 16 is fixed is press-fitted and fixed to the shaft portion 14b, and its outer end is crimped and fixed to the lever member 15.

In this case, the second hair spring 16 and the lever member 15 are integrally assembled to the base 14, and the base 14 is press-fitted and fixed to the pointer shaft 8 between the plate 5 and the dial 18. Further, between the plate 45 and the dial 18, there are a spacer part 19 for adjusting the height between the bottom wall of the instrument body frame 1 and the dial 18, and a stopper part 20 for stopping the rotation of the lever member 15. A mounting member 21 is provided which is integrally formed.

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 18a of 8 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 member 9, and a rotational torque proportional to the rotation of the magnet 4 acts on the induction member 9, causing the induction member 9 to The rotational torque is balanced with the elastic force of the first hair spring 11, and the rotational shaft 3
The change in angular rotation of the pointer 10 according to the number of rotations of the dial 18 is measured and displayed by comparing it with a display section 18a such as a scale or numbers on the dial plate 18.

In this case, the lever member 15 and the second hair spring 1
6 performs an angular rotation movement in synchronization with the angular rotation movement of the pointer shaft 8 together with a base 14 which is press-fitted and fixed to 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 guiding member 9, which causes the pointer shaft 8 to further angularly rotate, and the pointer shaft 8 The pointer shaft 8 rotates angularly while the lever member 15 provided thereon contacts the stopper portion 20.

That is, the first and second hair springs 11 and 16
A restraining force due to elasticity is applied to the pointer shaft 8, and the range in which the pointer 10 is instructed to operate in this case is set to a state in which both the first and second hair springs 11 and 16 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 portion 18a of the dial 18 is graduated at an angle δ greater than the reference angle θ after the scale angle conversion point A, with the scale angle conversion point A as a border. The member 16 separates from the stopper portion 20 and becomes the second hair spring 16.
As the stress is no longer applied, the rotation angle of the pointer shaft 8 increases, so the angle δ is set to a value obtained by adding this decreased angle to the reference angle θ.

By the way, until the lever member 15 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 18a of the dial 18.
In the meantime, since the lever member 15 is disposed on the base portion 14a of the base 14 which is press-fitted and fixed to the pointer shaft 8, the lever member 15 rotates angularly with the base 14 in synchronization with the angular rotation movement of the pointer shaft 8. can be carried out.

Therefore, the lever portion 15 can smoothly perform an angular rotation operation without interference such as friction with the base 14, and the indication of the pointer 10 can be stabilized.

Furthermore, since the lever member 15 and the second hair spring 16 are integrally assembled on the base 14 and then press-fitted into the instrument body, the efficiency of the assembly work is improved, and the stopper part 20 of the lever member 15 and the spacer part 19 By integrally forming the parts, the number of parts can be reduced and assembly workability can be improved.

Note that the scale angle conversion point A can be arbitrarily set by appropriately changing the press-fitting direction of the pedestal 14 with respect to the pointer shaft 8.

Further, it is possible to form various spacer parts 19 with different heights and to select and use them appropriately when adjusting the height.

[Effect of idea]

After the second hair spring, lever member, and pedestal are assembled in sequence, each member is assembled to the pointer shaft, which improves the workability of assembling the instrument body, and allows the lever member to be rotated stably. It is possible to provide an indicating instrument in which the operation of the pointer is stable.

In addition, visibility can be improved by instructing to enlarge the instruction operation area particularly when driving at low speeds, which are frequently used, such as in tractors, buggies, and the like.

[Brief explanation of the drawing]

1 to 4 show a first embodiment of the present invention, in which FIG. 1 is a sectional view, FIG. 2 is a perspective view of the main parts,
FIG. 3 is a plan view showing the operating state of the main parts, and FIG. 4 is a plan view showing the operating state of the pointer on the dial. DESCRIPTION OF SYMBOLS 1... Instrument frame, 3... Rotating shaft, 4... Magnet, 5... Plate, 8... Pointer shaft, 9... Guide member, 10... Pointer, 11... First hair spring,
14... Base, 15... Lever member, 16... Second hair spring, 18... Dial plate, 18a... Display section, 19... Spacer section, 20... Stopper section.

Claims (1)

[Scope of utility model registration request] A plate is installed on the open end of a U-shaped frame to form the frame of the indicator, a dial is attached and fixed above the plate, and 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, the upper end side of the pointer shaft is pivotally supported on at least the plate, and a guide member disposed with a slight gap from the magnet is provided at the lower part of the pointer shaft;
A pointer indicating the display part of the dial is fixed to the upper end of the pointer shaft, and the eddy current action generated by the rotational movement of the magnet is used to balance the guiding member with the elastic force of the hair spring and instruct the rotation. In the indicator, a first hair spring that acts over the entire area of the indicator scale operation area of the instrument, and a second hair spring that acts on a specific area of the indicator scale operation area,
A lever member that rotates in conjunction with the second hair spring is provided, and a pedestal through which the lever member can be rotatably inserted is provided, and the lever member is rotated in accordance with the scale angle conversion point of the specific area. A regulating part that stops rotation is provided between the plate and the dial,
The inner end of the first hair spring is fixed to the pointer shaft side, the outer end of the first hair spring is fixed to the frame of the instrument, the inner end of the second hair spring is fixed to the pedestal side, and the outer end of the first hair spring is fixed to the pointer shaft side. is fixed to a lever member inserted into the pedestal side, and the pedestal of the lever member is press-fitted and fixed to the pointer shaft.