JPH0136138Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to indicating instruments such as speedometers and tachometers that are installed in automobiles, and particularly to indicating instruments equipped with a hair spring adjustment member.

In general, this type of indicating instrument will be described in detail with reference to FIG. A magnet 4 and a magnetic conductor 5 are fixed to the upper end of this rotary shaft 3, and the rotary shaft 3 is configured to be rotationally driven by a vehicle via a flexible cable (not shown). .

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

Reference numeral 12 denotes a hair spring for controlling the rotation of the pointer shaft 9, the inner end of which is fixed to a hair ball 13 press-fitted to the pointer shaft 9, and the outer end rotatable as the axis of the pointer shaft 9. Beard spring adjustment member 14 supported on
It is fixed at

Reference numeral 15 denotes a dial plate screwed onto the plate 6 with screws 16 and having scales and numerical values on its surface.

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

By the way, in the assembling work of the indicating instrument having the above configuration, the hairspring 12 that is assembled to the pointer shaft 9
First, the inner end of the hair spring 12 is fixed to the hair ball 13, and the hair ball 13 to which the hair spring 12 is attached is press-fitted onto the pointer shaft 9. Next, the mustache spring 12
The outer end of is fixed to the hair spring adjustment member 14. At this time, the pointer shaft 9 is kept in a stable state and stopped at a position where the deflection of the hair spring 12 is not applied.
If the indicated direction of the pointer 11 does not match the zero position on the dial 15 at the stop position, the hair spring 1
A hair spring adjusting member 14 supporting the outer end of the needle 11 is rotatably adjusted to an appropriate position to point the pointer 11 to the zero scale position with respect to the dial 15.

For example, as shown in FIG. 2, a rising stepped portion 18 having a circular planar shape is formed on the upper circumference of the mounting hole 17 of the upper bearing 7 formed in the plate 6 that constitutes a part of the frame 1, and the rising stepped portion 18 is The upper end of the upper bearing 7 is disposed to protrude upward, and the hair spring adjustment member 14 is inserted into the rising step 18,
Then, insert the wave washer 19 from above the hair spring adjustment member 14, screw the nut 20 onto the upper end of the upper bearing 7, and use the elasticity of the wave washer 19 to move the hair spring adjustment member 14 to the pointer shaft 9. It is rotatably supported and held as an axis. Alternatively, as shown in FIG.
4, insert the wave washer 19 from above the hair spring adjustment member 14, and insert the flat washer 21 into the upper end protrusion of the upper bearing 7. are crimped and fixed, and the elasticity of the wave washer 19 supports and holds the hair spring adjusting member 14 rotatably about the pointer shaft 9.

Therefore, in the case shown in FIG. 2, it is necessary to form a thread for screwing the nut 20 onto the upper bearing 7, and the number of parts and assembly man-hours increases because the nut 20 is screwed. Furthermore, the case shown in FIG. 3 also has the disadvantage that the number of parts and the number of assembly steps are increased because it is necessary to perform the caulking work while inserting the flat washer 21. In addition, in FIGS. 2 and 3, the nut 20 is screwed in or the nut 20 is tightened via the flat washer 21 while the wave washer 19 is inserted into the planar circular stepped portion 18. During work, the wave washer 19 touches the stepped portion 18.
It was in an unstable state where it could easily come off, making work even more difficult.

In view of the above circumstances, the purpose of this invention is to provide an indicating instrument in which a hair spring adjustment member can be incorporated in a stable state with a small number of parts and assembling man-hours. The movable part of the instrument including the pointer shaft is arranged on the instrument frame by pivotally supporting the pointer shaft on the lower bearing, the upper bearing is attached and held in the hole provided in the frame, and the axis of the pointer shaft is A hair spring adjustment member is rotatably supported at the center, the inner end of the hair spring is fixed to the pointer shaft, the outer end is fixed to the hair spring adjustment member, and the drive torque from the drive source is applied by the elasticity of the hair spring. In a device in which the indicated movement of the above-mentioned pointer is performed by balancing with a suppressing force, a rising step is formed at the upper periphery of the mounting hole of the upper bearing, and the upper end of the upper bearing is formed above the rising step. a protruding portion, the hair spring adjusting member is inserted into the rising step portion, and the protruding portion of the upper bearing is provided with a protruding portion;
A holding plate having a portion to be crimped and an elastic pressure contact portion of the hair spring adjusting member is inserted, and the upper end portion of the upper bearing is crimped and fixed to the stepped portion via the portion to be crimped.

Next, an embodiment of this invention will be explained with reference to FIGS. 4 and 5.

The overall structure and operation of the indicating instrument of this invention are almost the same as those of the conventional example described with reference to FIG. , or equivalent parts will be explained using the same reference numerals.

A rotating shaft 3, a magnet 4, a magnetic conductor 5, and a lower bearing 8 are formed on the bottom surface of the instrument frame 1, which is bent into a U-shape, with a bearing member 2 interposed therebetween.

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

Reference numeral 12 denotes a hair spring for controlling the rotation of the pointer shaft 9, the inner end of which is fixed to a hair ball 13 that is press-fitted into the pointer shaft 9, and the outer end fixed to a hair spring adjustment member 14. .

A dial 15 is screwed onto the plate 6 with screws 16 and has scales and numerical values on its surface.

Further, as shown in FIG.
The upper end of the upper bearing 7 is arranged to protrude above the rising step 18, and the hair spring adjusting member 14 is inserted into the rising step 18, and the upper crimped portion 22a and the lower hair spring are connected to each other. Adjustment member 14
A holding plate 22 having an elastic pressure contact portion 22b of
is inserted into the upper end protrusion 7a of the upper bearing 7, and
By crimping and fixing the upper end projection 7a of the upper bearing 7 to the stepped portion 18 via the crimped portion 22a of the holding plate 22, the hair spring adjustment member 14 is pressed by the action of the elastic pressure contact portion 22b, and the hair spring adjustment is performed. A member 14 rotatably supports and holds the axis of the pointer shaft 9 therein. In addition, in FIG. 5, a stepped portion 1 where the projection 7b of the upper bearing 7 engages with the mounting hole 17 of the plate 6 constituting a part of the frame 1.
7a is formed and the upper end protrusion 7a of the upper bearing 7 is caulked by the engagement between the protrusion 7b and the step 17a. However, as shown in FIG. The protruding portion 7b of the upper bearing 7 may be engaged with the lower end peripheral surface 17b of the mounting hole 17 instead.
Note that the caulked portion 22a of the holding plate 22 has a through hole 22 that is substantially the same as the upper end protrusion 7a of the upper bearing 7.
c is formed. Further, the structure of the holding plate 22 is not limited to the one in which the elastic press-contact portion 22b is formed in a circular plate by a hole 22d as shown in FIG. It may be selected as appropriate, such as a flat plate-shaped one as shown in FIG. 9, or a planar cross-shaped one as shown in FIG. 10.

Therefore, as shown in FIGS. 4 to 6, the holding plate 22 is inserted into the upper end protrusion 7a of the upper bearing 7 from above the hair spring adjustment member 14, and the upper end portion 7a of the upper bearing 7 is held. By crimping and fixing to the plate 22, the hair spring adjusting member 14 can be fixedly held by the holding plate 22 and at the same time supported and held stably rotatably around the pointer shaft 9, compared to the conventional one. Since thread forming work, nuts, and flat washers are no longer necessary, the number of parts and assembly man-hours are reduced accordingly, resulting in better costs. In addition, since the holding plate is inserted into the upper end protrusion 7a of the upper bearing 7 instead of the planar circular stepped part 18, there is no fear that the holding plate will be in an unstable state where it is easy to pull out, so the caulking work can be performed well. I can do it.

As described above, this idea is to arrange the movable part of the instrument including the pointer shaft in the instrument frame by pivotally supporting the pointer shaft on the upper and lower bearings provided on the instrument frame, and to install the upper bearing on the frame. The hair spring adjustment member is mounted and held in the hole provided in the needle shaft, and the hair spring adjustment member is rotatably supported around the axis of the pointer shaft, the inner end of the hair spring is fixed to the pointer shaft, and the outer end is fixed to the hair spring adjustment member. and in which the pointing operation is performed by balancing the drive torque from the drive source by the force suppressed by the elasticity of the hair spring, and a raised step is formed on the upper periphery of the mounting hole of the upper bearing. and the upper end of the upper bearing is arranged to protrude above the rising step,
The hair spring adjustment member is inserted into the rising stepped portion, and a holding plate including a portion to be crimped and an elastic pressure contact portion of the hair spring adjustment member is inserted into the protruding portion of the upper bearing, and the upper end of the upper bearing is inserted. The part is crimped and fixed to the stepped part through the part to be crimped, and the retaining plate fixes and holds the hair spring adjustment member, while at the same time supporting and holding it so that it can rotate stably around the pointer shaft. This has the effect of reducing the number of parts and assembly man-hours.

[Brief explanation of the drawing]

Figures 1 to 3 are cross-sectional views showing conventional devices;
6 to 6 are sectional views showing an embodiment of this invention, and FIGS. 7 to 10 are perspective views showing an embodiment of the holding plate. 1...Instrument frame, 7...Upper bearing, 7a...
... Upper end protrusion, 9 ... Pointer shaft, 11 ... Pointer, 1
2... Beard spring, 14... Beard spring adjustment member, 1
8...Step part, 22...Holding plate, 22a...
Part to be crimped, 22b...Elastic pressure welding part.

Claims (1)

[Scope of utility model registration request] The movable part of the instrument including the pointer shaft is mounted on the instrument frame by pivotally supporting the pointer shaft on upper and lower bearings provided in the instrument frame, and the upper bearing is attached and held in the hole provided in the frame. , and a whisker spring adjusting member is rotatably supported around the axis of the pointer shaft, an inner end of the whisker spring is fixed to the pointer shaft, and an outer end thereof is fixed to the whisker spring adjusting member;
In the device in which the pointing operation of the pointer is performed by balancing the drive torque from the drive source by the restraining force of the elasticity of the hair spring, a rising step is formed on the upper periphery of the mounting hole of the upper bearing. , the upper end of the upper bearing is disposed to protrude above the rising step, the hair spring adjusting member is inserted into the rising step, and the swaged portion and the hair spring adjusting member are attached to the projecting portion of the upper bearing. Insert a holding plate with an elastic pressure contact part,
An indicating instrument characterized in that an upper end portion of the upper bearing is crimped and fixed to the stepped portion via a portion to be crimped.