JPH0416904Y2 - - Google Patents

Description

[Detailed description of the invention] (Industrial application field) The present invention is an improvement of an indicating instrument equipped with a bevel spring, such as a speedometer or a tachometer, which is installed in a car, in particular, a structure for tightening and fixing the bevel spring of an indicating instrument. Regarding.

(Prior Art) Generally, in this type of indicating instrument, as shown in FIGS. 7 and 8, a rotating shaft 3 is rotatably attached to the bottom of an instrument frame 1 which is bent into a U-shape via a bearing member 2. A magnet 4 and a magnetic conductor 5 are fixed to the upper end of the rotating shaft 3, and the rotating shaft 3 is formed so as to be rotationally driven by the vehicle via a flexible cable (not shown). There is.

Further, a plate 6 constituting a part of the instrument frame 1 is installed on the opening side of the instrument frame 1, and an upper bearing 7 is formed at the center of the plate 6, and a lower bearing 7 is formed at the center of the upper end of the rotating shaft 3. A pointer shaft 9 is pivotally supported by both bearings 7 and 8. A guide plate 10 is fixed to the lower end of the pointer shaft 9 and is arranged in correspondence with the magnet 4 fixed to the rotary shaft 3, and a pointer 11 is press-fitted and fixed to the upper end of the guide plate 10.

Also, a hair spring 12 that controls the rotation of the pointer shaft 9
A hairspring adjustment member 14 whose inner end is fixed to a hairpiece ball 13, which is press-fitted and engaged with the pointer shaft 9, and whose outer end is rotatably supported around the pointer shaft 9.
It is fixed at

Therefore, the rotation from the vehicle is transmitted to the rotating shaft 3 via a flexible cable (not shown), and the magnet 4 and magnetic conductor 5 rotate together with the rotating shaft 3, and the eddy current action generated by the rotational movement of the magnet 4 occurs. is effectively guided to the guide plate 10 by the magnetic conductor 5, a rotation torque proportional to the rotation of the magnet 4 acts on the guide plate 10, and the rotation torque of the guide plate 10 is balanced with the elastic force of the hair spring 12. The change in rotation of the pointer 11 according to the rotation speed of the rotary shaft 3 is measured and displayed by comparing it with the scale and numerical values on the dial plate 15.

By the way, in the assembling work of the indicator with the above configuration, the hairspring that is assembled to the pointer shaft 9 has the following characteristics:
First, fix the inner end of the mustache spring 12 to the mustache ball 13,
This hair bead 13 is loosely fitted onto the pointer shaft 9, and then the outer end of the hair spring 12 is crimped and fixed to the crimped portion 16 of the hair spring adjustment member 14, and then the hair ball 13 is fitted onto the pointer shaft 9.
It is press-fitted into place. In that case, when the outer end of the hair spring 12 is crimped and fixed to the crimping part 16 of the hair spring adjusting member 14, the hair spring 12 is usually protruded from the crimping part 16 by a length A measured by eye.
Each instrument is assembled so that the strength is almost uniform.

In addition, as a structure for assembling a hair spring other than caulking, Japanese Utility Model Application Publication No. 56-54412 discloses a structure in which a flat joint part and a terminal bent part are formed on the outer end side of the hair spring, and the outer end side of the hair spring is fixedly held. A fixing structure for a spiral spring for controlling an instrument is disclosed in which a pair of contact parts and a claw part are formed between the contact parts in a hair spring receiving part made of a resin. In order to fix and hold the hair spring, the complex structure of the hair spring adjustment member, which consists of a contact part and a claw part, is molded from resin. A complex mold is required to accommodate the uneven shape of the protrusion to be prevented, resulting in poor molding workability and increased costs for the hairspring receiver, and the fixing structure is more secure than caulking. There were aspects that were difficult to obtain.

(Problem to be solved by the invention) In caulking and fixing the hairspring, the protrusion dimension A of the outer end of the hairspring from the fixing part is determined by eye measurement, which causes variation in the protrusion dimension A. The constant changes, and as a result, the indicated torque of the indicator varies depending on the length of the hairspring.
Adjusting the restraining force in step 2 tends to be time-consuming, and in some cases, there is a risk that the adjustment may be difficult due to variations that are larger than the allowable adjustment range of the hair spring adjustment member 14.

SUMMARY OF THE INVENTION An object of the present invention is to provide an indicator that can be stably and easily assembled by preventing dimensional errors in assembling a hairspring during crimping and fixing.

(Means for solving the problem) The feature of the present invention is that it is installed in the instrument frame,
By pivotally supporting the pointer shaft on the lower bearing, the movable part of the instrument including the pointer shaft is arranged on the instrument frame, the inner end of the hair spring is fixed to the above pointer shaft, and the outer end is attached to the above instrument frame side. In the indicator, the indicator is fixed to a disposed hair spring receiver by caulking and the driving torque from the drive source is balanced by the restraining force due to the elasticity of the hair spring to perform the indicating operation of the pointer. A fixing part is formed from a metal plate, and a fixing part for fixing the outer end of the whisker spring by caulking is formed on the whisker spring receiving part, and an abutment part for positioning the outer end of the whisker spring is abutted from the fixing part. The reason is that the bends are formed at predetermined intervals.

(Function) By caulking and holding the outer end of the hair spring against the abutting part by the fixing part, the amount of protrusion A that protrudes from the fixing part becomes a constant size even during quick assembly work. This allows the length of the beard spring to be kept almost constant,
It is possible to assemble the suppressing force, that is, the command torque, by the hair spring in a stable state.

(Embodiment) A first embodiment of the present invention will be described with reference to FIGS. 1 to 3.

1 to 3, a rotary shaft 23 is rotatably supported and held at the bottom of a bent instrument frame 21 via a bearing member 22, and a magnet 24 and a magnetic conductive material are attached to the upper end of the rotary shaft 23. 25 is fixed, and the rotating shaft 23 is configured to be rotationally driven from the vehicle via a flexible cable (not shown). A plate 26 constituting a part of the instrument frame 21 is installed on the opening side of the instrument frame 21.
An upper bearing 27 is formed at the center of the rotary shaft 23, and a lower bearing 28 is formed at the center of the upper end of the rotating shaft 23, so that the pointer shaft 29 is pivotally supported by both bearings 27 and 28. Further, on the lower end side of this pointer shaft 29, a guide plate 3 is disposed corresponding to the magnet 24 fixed to the rotating shaft 23.
0 is fixed, and a pointer 31 is press-fitted and fixed to the upper end. Also, connect the inner end of the mustache spring 32 to the mustache ball 33.
A hair spring receiving part in which the hair ball 33 is press-fitted and fixed to the pointer shaft 29 at a position above the plate 26, and its outer end is supported rotatably about the pointer shaft 29 on the upper surface of the plate 26. It is fixed to the hair spring adjustment member 34.

Therefore, the rotation from the vehicle is transmitted to the rotating shaft 23 via the flexible cable, and the magnet 24 and the magnetic conductor 25 rotate together with the rotating shaft 23, and the eddy current effect generated by the rotational movement of the magnet 24 is absorbed. A rotation torque proportional to the rotation of the magnet 24 that is effectively guided to the dielectric body 30 by the magnetic conductor 25 acts on the dielectric plate 30, and this rotation torque of the dielectric plate 30 is balanced with the elastic force of the hair spring 32. The change in rotation of the pointer 31 according to the number of rotations of the rotary shaft 23 is measured and displayed in comparison with the scale and numerical values on a dial 35 disposed above the plate 26.

By the way, in the fixing structure between the outer end of the beard spring 32 and the beard spring adjusting member 34, as shown in FIGS. The abutment piece 37 is formed so that the abutment surface 37a is positioned at a predetermined distance A from the fastening piece 36.

Therefore, the mustache ball 33 is loosely inserted into the pointer shaft 29, and then the outer end of the mustache spring 32 is inserted into the abutment surface 3 of the abutment piece 37.
7a, it is crimped and fixed by the crimping piece 36, and then the hair ball 33 is press-fitted and fixed to the pointer shaft 29. Therefore, the outer end of the hair spring 32 protrudes from the crimping piece 36 with a uniform dimension. The length of the hair spring 32 between the hair ball 33 and the adjustment member 34 can be kept almost constant, and therefore the strength of the hair spring 32 can be made stable. I can do it. Therefore, it is possible to easily adjust the index of the indicator after assembly.

4 to 6 show the second embodiment, and the first embodiment
To explain using the same reference numerals for the same parts as those in the figures or FIGS. 3, a mustache spring receiving part in which the mustache ball 33 is press-fitted and fixed to the pointer shaft 29 at the lower position of the plate 26, and the outer end thereof is suspended from the plate 26. It is fixed to the arm 38. In that case, the mustache spring 32
In the fixing structure between the outer end of the arm 38 and the arm 38,
As shown in FIG. 5, a crimping piece 36 serving as a fixing part is provided at the end of the arm 38, and an abutting part serving as an abutting part is placed so that an abutting surface 37a is positioned at a predetermined distance A from the crimping piece 36. The piece 37 is formed by bending. Therefore, the hair bead 33 is loosely inserted into the pointer shaft 29 below the plate 26, and then the outer end of the hair spring 32 is crimped and fixed by the crimping piece 36 with the outer end of the hair spring 32 abutting against the abutment surface 37a of the abutment piece 37. Thereafter, the bead 33 is press-fitted onto the pointer shaft 29, and the fixing work can be carried out efficiently and in a stable manner. Therefore, the length of the hair spring 32 between the hair ball 33 and the adjustment member 34 can be kept substantially constant.

(Effect of the invention) As described above, the present invention allows the movable part of the instrument including the pointer shaft to be arranged in the instrument frame by pivotally supporting the pointer shaft on the upper and lower bearings provided on the instrument frame. The inner end of the hair spring is fixed to the shaft, and the outer end is crimped and fixed to the hair spring receiver disposed on the instrument frame side, and the driving torque from the drive source is balanced by the suppressing force due to the elasticity of the hair spring. In the indicating instrument, the above-mentioned bevel spring receiving portion is formed of a metal plate, and a fixing portion for fixing the outer end of the above-mentioned beard spring by caulking is formed in the above-mentioned beard spring receiving portion; Since the abutment part against which the outer end of the hair spring is abutted and positioned is bent at a predetermined distance from the fixing part, the strength of the hair spring can be maintained stably.
It is also possible to provide an indicating instrument with excellent assembly workability.

[Brief explanation of drawings]

1 to 3 show a first embodiment of the present invention, in which FIG. 1 is a sectional view, FIG. 2 is a plan view showing a state in which the hair spring is assembled, FIG. 3 is a perspective view, and FIG. 4 is a perspective view.
6 to 6 show a second embodiment of the present invention, FIG. 4 is a front view, FIG. 5 is a perspective view of main parts, FIG. 6 is a sectional view, FIG. 7 is a sectional view, and FIG. Figure 8 is a plan view of the main part. 21... Instrument frame, 23... Rotating shaft, 2
7, 28... Bearing, 29... Pointer shaft, 32... Beard spring, 33... Beard ball, 34... Beard spring adjustment member (beard spring receiving part), 36... Caulking piece (fixing part), 37... Abutment piece (abutment part), 38...arm (beard spring receiving part), A...predetermined interval.

Claims (1)

[Scope of utility model registration request] By pivotally supporting the pointer shaft on upper and lower bearings provided on the instrument frame, the movable part of the instrument including the pointer shaft is arranged on the instrument frame, and the inner end of the hairspring is fixed to the above pointer shaft. The outer end is crimped and fixed to a hair spring receiving part arranged on the instrument frame side, and the driving torque from the drive source is balanced by the restraining force of the elasticity of the hair spring to perform the pointing operation. In the indicator, the hair spring receiving part is formed from a metal plate, and a fixing part for fixing the outer end of the hair spring by crimping is formed on the hair spring receiving part, and the outer end of the hair spring is abutted against it for positioning. An indicator characterized in that the abutting part is bent at a predetermined distance from the fixed part.