JP2002340934A - Pointer driving mechanism for meter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To form a cylindrical support hole penetrating the casing wall for press-fitting a support shaft rotatably supporting a rotor of a motor assembled in the resin-made casing of a pointer driving mechanism for the meter and a support shaft rotatably supporting the intermediate gear in a reduction gear train for reducing and transmitting the rotation of the motor to a pointer shaft. SOLUTION: In a casing member 10a, a support hole 12b is formed penetrating to support the base end 41 of the support shaft 40a on an upper wall 12, and a support hole 12c is formed penetrating to support the base end 72 of the support shaft 70c on the upper wall 12. The support shaft 40a is press-fitted in a support hole 12b at the base end 41, and the support shaft 70c is press-fitted in the support hole 12c at the base end 72 to be parallel to the support shaft 40a.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotating inner machine for an instrument.

[0002]

2. Description of the Related Art Conventionally, for example, in a rotating inner machine of a passenger car instrument, the inner machine main body is constructed by assembling a step motor and a reduction gear train driven by the step motor in a resin casing. There is something. The reduction gear train is an output stage gear supported in the casing at an intermediate portion of the pointer shaft extending through the upper wall of the casing,
An input gear driven by a step motor and an intermediate gear meshed between the output gear and the input gear are provided. Here, the rotor and the intermediate gear of the step motor are each rotatably supported by a pin-shaped metal support shaft having a circular cross section supported between the upper and lower walls of the casing.

[0003]

By the way, in the above rotary inner machine, the support of the metal supporting shafts on the upper and lower walls is carried out by lowering the respective supporting shafts at their base ends at the lower wall of the casing. This is achieved by press-fitting into the respective cylindrical support holes formed so as not to rotate.

However, when the casing is injection-molded by using an injection mold, the bottom of each of the above-described support holes is closed, so that the axis of each cylindrical support hole in the upper wall of the casing is unique to the mold. From the above problem and the problem of air remaining in each support hole, it is easy to tilt with respect to the surface direction of the upper wall. For this reason, even if each support shaft corresponding to each such support hole is press-fitted at its base end, each support shaft is not parallel to each other but tilts and extends from each cylindrical support hole of the upper wall. Put out. For this reason, there arises a problem that the magnet rotor and the intermediate gear cannot be properly supported in the casing.

Further, since the bottom of each of the support holes is closed, even if each support shaft is press-fitted into each of the support holes, there is no air vent hole in each of the support holes. The base end cannot be completely pressed into each support hole to the bottom, or the air compressed by the base end of each support shaft in each support hole expands due to the temperature and supports each base end. There is also a problem that the support shafts cannot be firmly held in the support holes by being moved in the direction of pushing out from the holes.

In view of the above, the present invention has been made in view of the above circumstances. In a rotating instrument for an instrument, a supporting shaft for rotatably supporting a rotor of an electric motor assembled in a resin casing of the instrument and an electric motor for rotating the instrument. It is intended to form a cylindrical support hole for press-fitting a support shaft rotatably supporting an intermediate gear of a reduction gear train that transmits rotation to a pointer shaft by reducing the rotation of the shaft through a wall of a casing. .

[0007]

In order to solve the above-mentioned problems, an instrument rotary inner unit according to the first aspect of the present invention has a casing (10) formed by assembling both casing members (10a, 10b) together. A pointer shaft (20) rotatably supported by the opposing walls (11, 12) of the two casing members; and at least first and second metallic members supported between the opposing walls of the two casing members. Support shaft (40
a, 70c) and the first
An electric motor (M) having a rotor (70) rotatably supported by a support shaft; an input step gear (60) driven by the motor; and an output step gear (30) non-rotatably supported by a pointer shaft. ) And an intermediate gear (40, 50) rotatably supported by the second support shaft so as to mesh between the input stage gear and the output stage gear, and a reduction gear train ( G).

In the rotary inner machine, one of the opposing walls (12) of the two casing members has a corresponding portion with respect to the base end (41, 72) of the first and second support shafts. Support holes (12b, 12c, 12d, 12e, 12f, 12
g) are formed in a penetrating manner and parallel to each other, and the first and second support shafts are press-fitted coaxially at respective base ends thereof into respective support holes of one of the opposed walls. , Extending toward the other opposing wall (11).

As described above, since the support holes are formed in parallel with each other, when the base ends of the first and second support shafts are pressed into the corresponding support holes, the first and second support holes are formed. The two support axes can be kept parallel to each other.

Since the first and the support holes are open outward from the outer surface of the one opposing wall, the base ends of the first and the second support shafts are connected to the corresponding support shafts. When press-fitted into the holes, the air in the hollow portions of the respective support holes is pushed outward by the respective base ends. Therefore, not only can the base ends be sufficiently press-fitted into the corresponding support holes, but even if the air in the support holes expands, the air flows from the support holes to the outer surface side of the one opposing wall. Spills out. Therefore, the press-fitted state of each base end into each support hole can be favorably maintained without the base end coming out of each support hole.

According to a second aspect of the present invention, in the first aspect of the present invention, the first and second support holes are formed from the inner surface of one of the opposing walls. Along the axial direction of the shaft, it extends cylindrically toward the other opposing wall,
For each of the first and second support holes, the inside diameter of the extension end side axial hollow portion (J2) of the support hole portion is the extension end side axial hollow portion of the support hole portion. The inner diameter of the remaining axial hollow portion (J3, J4) excluding the portion is larger than the inner diameter, and each base end of the first and second support shafts extends into the corresponding support hole at the extension end side. It is characterized in that it is inserted through the axial hollow portion and press-fit into the remaining axial hollow portion.

As described above, when the first and second support shafts are press-fitted, the respective base ends thereof are respectively inserted into the corresponding remaining axial hollow portions through the corresponding extended end side axial hollow portions. Although being press-fitted, each of the extension-end-side axial hollow portions has an inner diameter that is larger than the inner diameter of the corresponding one of the remaining axial hollow portions and, consequently, the outer diameter of the base end of each support shaft. Thereby, the crack of each support hole can be prevented beforehand by the corresponding each remaining axial hollow portion. This means that the effect of the invention described in claim 1 can be achieved, and of course, in each support hole, the axially hollow portion on the extension end side prevents cracks when the support shaft is press-fitted. It means having a role.

According to a third aspect of the present invention, in the first aspect of the present invention, the first and second support holes are formed from the inner surface of one of the opposing walls. Along the axial direction of the shaft, it extends cylindrically toward the other opposing wall,
For each of the first and second support holes, a plate-like rib (b) is provided around the support hole between the outer peripheral surface and the inner surface of one of the opposing walls near the support hole. , C) are formed in plurality.

Thus, when the support shafts are pressed into the corresponding support holes, the support holes are prevented from being deformed radially and outward by the corresponding ribs. As a result, claim 1
Of course, it is possible to achieve the effects of the invention described in
It is also possible to prevent the support hole from cracking when the support shaft reaches the support hole.

[0015] The reference numerals in parentheses of the above means indicate the correspondence with the specific means described in the embodiment described later.

[0016]

Embodiments of the present invention will be described below with reference to the drawings.

(First Embodiment) FIG. 1 shows an example in which the present invention is applied to an instrument for a passenger car, and this instrument is provided on an instrument panel (not shown) provided in a passenger compartment of the passenger car. Is done. As shown in FIG. 1, the instrument includes a wiring board P and a rotating internal machine D. The rotary inner machine D includes a resin casing 10 attached to the back surface of the wiring board P, a metal pointer shaft 20, a step motor M and a reduction gear train G assembled in the casing 10. Here, the casing 10 is configured by fitting both casing members 10a and 10b having a U-shaped cross section to each other at their respective openings.

The pointer shaft 20 is rotatably supported at its base end 21 in a cylindrical support hole 11a formed in its lower side wall 11 in the casing 10.
0 is a cylindrical portion 12a formed on the upper wall 12 of the casing 10.
And extend coaxially and rotatably from the base end 21. Thus, the pointer shaft 20 is coaxially and rotatably supported by the casing 10 with the support hole 11a and the cylindrical portion 12a.

The reduction gear train G includes an output stage gear 30, both intermediate gears 40 and 50, and an input stage gear 60.
The output stage gear 30 is formed by integrally forming a cylindrical support hole 30b with a large-diameter spur gear portion 30a, and the output stage gear 30 is fitted with the pointer shaft 20 at the support hole 30b. It is coaxially supported by the joint shaft portion 20a. In FIG. 1, reference numeral 13 denotes a curved spring that biases the output stage gear 30.

The intermediate gear 50 is supported by its cylindrical boss so as to be rotatable coaxially on a metal pin-shaped support shaft 40a having a circular cross section. The intermediate gear 40 is coaxial with the boss of the intermediate gear 50. Are supported so that they cannot rotate relative to each other. Here, the intermediate gear 40 is a pinion gear, and the intermediate gear 50 is a spur gear. The intermediate gear 40 is a gear smaller in diameter than the spur gear portion 30a and the intermediate gear 50, and meshes with the spur gear portion 30a. The support shaft 40a is non-rotatably supported between the upper and lower walls 12, 11 on the right side of the pointer shaft 20 in FIG.

The input stage gear 60 is coaxially supported by a cylindrical support hole 71 of a magnet rotor 70 of the step motor M which will be described later. The input stage gear 60 is formed of a pinion gear having a smaller diameter than the spur gear portion 30 a and the intermediate gear 50, and meshes with the intermediate gear 50. In this embodiment,
The output stage gear 30, both intermediate gears 40 and 50, and the input stage gear 60 are formed of a synthetic resin (for example, a soft synthetic resin) that does not generate or at least hardly generates meshing noise.

The step motor M includes a magnet rotor 7
0 and an annular yoke 80. The magnet rotor 70 includes a cylindrical rotor portion 70a made of a non-magnetic material,
A large number of magnet portions 70b are fitted on the outer peripheral surface of the rotor portion 70a along the circumferential direction, and the rotor portion 70a is supported at its cylindrical support hole 71 by a metal pin-like support having a circular cross section. It is rotatably supported coaxially on the shaft 70c. Note that the large number of magnet portions 70b are formed by alternately fitting N magnetic pole portions and S magnetic pole portions to the outer peripheral surface of the rotor portion 70a. The support shaft 70c is non-rotatably supported between the upper and lower walls 12, 11 on the right side of the support shaft 40a in FIG.

The yoke 80 is interposed between the openings of the casing members 10a and 10b of the casing 10. The yoke 80 forms a stator of the step motor M together with the field windings (not shown).

Next, the support structure of the support shafts 40a and 70c to the casing 10 will be described in detail. The casing member 10a includes both cylindrical support holes 12b and 12c. The support hole 12b is formed in a portion of the upper wall 12 where the base end 41 of the support shaft 40a is to be supported, and is formed to protrude from the portion toward the lower wall 11 in a cylindrical shape. I have.

Accordingly, the support shaft 40a is coaxially and non-rotatably press-fitted into the support hole 12b of the upper wall 12 at the base end 41 thereof. Reference numeral 42 is coaxially supported in the support hole 11b of the lower wall 11. Here, the inner diameter of the cylindrical portion 12b is somewhat smaller than the outer diameter of the base end portion 41 of the support shaft 40a. In addition, the support hole 1
1b is located coaxially with the cylindrical portion 12b.

On the other hand, the support hole 12c is formed in a portion of the upper wall 12 where the base end 72 of the support shaft 70c is to be supported, and the support hole 12c is formed on the inner surface of the upper wall 12. Of the support shaft 70c, it protrudes cylindrically toward the lower wall 11 from a portion where the base end portion 72 of the support shaft 70c is to be supported.

Accordingly, the support shaft 70c is coaxially and non-rotatably press-fitted into the support hole 12c of the upper wall 12 at the base end 72 thereof. 73 is coaxially supported in the support hole 11c of the lower wall 11. Here, the inner diameter of the cylindrical portion 12c is slightly smaller than the outer diameter of the base end portion 72 of the support shaft 70c. In addition, the support hole 1
1c is located coaxially with the cylindrical portion 12c,
The axes b and 12c are parallel to each other.

In the first embodiment, both casing members 10a and 10b are injection-molded with a resin using an injection mold. Here, as described above, each of the cylindrical support holes 12b and 12c of the casing member 10a is
In FIG. 2, since both support holes 12b and 12c are formed in a penetrating shape, the support holes 12b and 12c open outward from the outer surface of the upper wall 12. In accordance with this, the injection mold has respective pin-shaped portions corresponding to the through-holes of the support holes 12b and 12c, respectively, in parallel with each other.

Accordingly, during the injection molding of the casing member 10a, the air in the through-holes of the support holes 12b and 12c is completely pushed out by the pin-shaped portions without remaining in the resin. Therefore, each of the support holes 12b and 12c can be formed so as to protrude from the inner surface of the upper wall 12 in parallel with each other.

In the first embodiment configured as described above, as described above, each of the support holes 12b and 12c is
Both extend in parallel from the inner surface of the upper wall 12. Therefore,
Each base end 41, 72 of both support shafts 40a, 70c is
As shown by the arrows in FIG.
b, 12c, when both support shafts 40a, 70c
Can be kept parallel to each other by the upper wall 12.

Here, since each of the support holes 12b and 12c is open outward from the outer surface of the upper wall 12, each of the base end portions 4b and 12c is open.
When 1, 72 are pressed into the corresponding support holes 12b, 12c, the air in the hollow portions of the support holes 12b, 12c is pushed outward by the base ends 41, 72. Accordingly, each base end 41, 72 is connected to the corresponding support hole 12b,
As a matter of course, even if the air in each of the support holes 12b and 12c expands, each of the support holes 12
b, 12c flows out to the outer surface side of the upper wall 12. Therefore, each base end part 41,7 into each support hole part 12b, 12c.
The press-fitting state of each support hole 12 of each base end 41, 72
B and 12c can be favorably maintained without slipping out.

As a result, the magnet rotor 70a is rotatably supported by the support shaft 70c and the intermediate gear 50
When the input stage gear 60 is rotatably supported coaxially on the support shaft 40a, the input stage gear 60 coaxially and non-rotatably supported in the support hole 71 of the magnet rotor 70a can satisfactorily mesh with the intermediate gear 50.

(Second Embodiment) FIG. 3 shows a second embodiment of the present invention. In the second embodiment, the upper wall 12 of the casing member 10a described in the first embodiment is
It has both cylindrical support holes 12d and 12e instead of both cylindrical support holes 12b and 12c. These two support holes 12d,
12e, both support holes 12b, 1
The supporting holes 12d and 12e are different from the supporting holes 12b and 12c, and each have a stepped cylindrical hollow portion H, though they are formed in a penetrating manner like 2c.

The stepped cylindrical hollow portion H has a large diameter portion H1.
And a small-diameter portion H2 coaxially communicating with the large-diameter portion H1 on the outer surface side of the upper wall 12. Large diameter section H1
The inner surface side opening h of the upper wall 12 is provided with support shafts 40a, 70c.
Is formed in a tapered cross section so that one of them can be easily inserted into the large diameter portion H1. The inner diameter of the small-diameter portion H2 is a value that allows air in the stepped cylindrical hollow portion H to be easily pushed out to the outer surface side of the upper wall 12. Here, the axial length of the large diameter portion H1 is determined by the base end portion 41 of the support shaft 40a and the support shaft 70c.
Length of each base end portion 72 in the axial direction (each support shaft 40a, 70c
).

Here, the casing member 10a is connected to the first
Injection molding is performed by using an injection mold with a resin as in the embodiment, but as described above, each of the support holes 12d,
Since 12e has a cylindrical hollow portion H with a penetrating step,
At the same time, the injection mold is provided with each support hole 1.
Stepped pin-shaped portions respectively corresponding to the penetrating stepped cylindrical hollow portions H of 2d and 12e are provided in parallel with each other.

Accordingly, during the injection molding of the casing member 10a, the air in the through stepped cylindrical hollow portion H of each of the support holes 12d and 12e does not remain in the resin, and each of the small diameters is formed by the above stepped pin portions. It is completely extruded from the section H2. Therefore, each of the support holes 12d and 12e can be formed so as to project from the inner surface of the upper wall 12 in parallel with each other. Other configurations are the same as those of the first embodiment.

In the second embodiment configured as described above, the respective support holes 12d and 12e extend in parallel from the inner surface of the upper wall 12 as described above. Therefore, when the support shafts 40a, 70c are pressed into the corresponding support holes 12d, 12e at their base ends 41, 72, the support shafts 40a, 70c are maintained parallel to each other by the upper wall 12. obtain.

Here, since the opening h of the stepped cylindrical hollow portion H of each of the support holes 12d and 12e is formed to have a tapered cross section, the base ends 41 and 7 of both the support shafts 40a and 70c.
2 can be easily and reliably pressed into the support holes 12d and 12e. In addition, each support hole 12d, 12e
Is opened outward from the outer surface of the upper wall 12 at each of the small diameter portions H2, so that when the base ends 41 and 72 are press-fitted into the corresponding support holes 12d and 12e, Air in the stepped cylindrical hollow portions H of the support holes 12d and 12e is pushed outward from the small diameter portions H2 by the base ends 41 and 72.

Accordingly, the base portions 41 and 72 can be sufficiently pressed into the corresponding large-diameter portions H1 of the support holes 12d and 12e, and the air in the support holes 12d and 12e can be sufficiently pressed. Even if expanded, it flows out of the small-diameter portion H2 to the outside of the outer surface of the upper wall 12. Therefore, the press-fit state of each base end 41, 72 into each support hole 12 d, 12 e depends on each base end 41, 7.
2 can be satisfactorily maintained without slipping out of the large diameter portion H1. As a result, the same functions and effects as in the first embodiment can be achieved.

(Third Embodiment) FIG. 4 shows a third embodiment of the present invention. In the third embodiment, the upper wall 12 of the casing member 10a described in the first embodiment is
It has both cylindrical support holes 12f and 12g instead of both cylindrical support holes 12b and 12c. These two support holes 12f,
12g, both support holes 12b, 1
2c, the supporting holes 12f and 12g are different from the supporting holes 12b and 12c, and each have a stepped cylindrical hollow portion J.

The stepped cylindrical hollow portion J is constituted by an opening J1 having a tapered cross section, a large-diameter portion J2, and a small-diameter portion J3 coaxially communicating with the opening J1 via the large-diameter portion J2. , The stepped cylindrical hollow portion J is connected to the upper wall 1 at the opening J1.
2 and open to the outer surface of the upper wall 12 at the small diameter portion J3. The inner diameter of the small diameter portion J3 is the first diameter.
It is equal to the inner diameter of the support hole 12c described in the embodiment.

Further, between the opening J1 and the small diameter portion J3,
The reason why the large-diameter portion J2 having an inner diameter larger than the small-diameter portion J3 is provided is that the press-fit positions and press-fit lengths of the support shafts 40a and 70c into the corresponding support holes 12g and 12f are appropriately secured. Then, each support hole 12 at the time of press-fitting each support shaft 40a, 70c corresponding to each support hole 12g, 12f.
This is to prevent the occurrence of cracks of g and 12f.
Therefore, one of the press-fit lengths of the base ends of the support shafts 40a and 70c in the small diameter portion J3 of the stepped cylindrical hollow portion J is B,
When the sum of the axial lengths of the opening J1 and the large diameter portion J2 is A,
It is set so that (A / B) = (１ ／).

Here, the casing member 10a is connected to the first
As in the embodiment, injection molding is performed by using an injection mold with a resin, but as described above, each of the support holes 12f,
Since 12g has a cylindrical hollow portion J with a penetrating step,
At the same time, the injection mold is provided with each support hole 1.
Each stepped pin-shaped portion corresponding to each of the penetrating stepped cylindrical hollow portions J of 2f and 12g is provided in parallel with each other.
Therefore, at the time of injection molding of the casing member 10a, air in the through-hole stepped cylindrical hollow portions J of the support holes 12f and 12g does not remain in the resin, and the air flows from the small-diameter portions J3 by the stepped pin portions. Completely extruded. Therefore, each of the support holes 12f and 12g can be formed so as to protrude from the inner surface of the upper wall 12 in parallel with each other. Other configurations are the same as those of the first embodiment.

In the third embodiment configured as described above, the support holes 12f and 12g both extend in parallel from the inner surface of the upper wall 12 as described above. Therefore, when the support shafts 40a, 70c are pressed into the corresponding support holes 12f, 12g at their base ends 41, 72, the support shafts 40a, 70c are maintained parallel to each other by the upper wall 12. obtain.

Here, since the opening J1 of the stepped cylindrical hollow portion J of each of the support holes 12f and 12g is formed to have a tapered cross section, the base end 41 of each of the support shafts 40a and 70c,
72 can be easily and reliably pressed into the support holes 12f and 12g. When the support shafts 40a and 70c are press-fitted, the base ends 41 and 72 are formed into corresponding small-diameter portions J3 through corresponding large-diameter portions J2. The support shaft 40a has an inner diameter larger than the inner diameter of the small-diameter portion J2, and thus the outer diameter of the base end of each of the support shafts 40a and 70c, and the sum A of the axial lengths of the opening J1 and the large-diameter portion J2. The ratio (A / B) of one press-fitting length B of the base end portion of 70c is almost (1/2). Thus, cracks in the support holes 12f and 12g are prevented by the corresponding large-diameter portions J2 beforehand, and the support shafts 40
Pressing into the corresponding support holes 12f and 12g of the corresponding a and 70c can be properly performed.

Since the support holes 12f and 12g are opened outward from the outer surface of the upper wall 12 at the small diameter portions J3, the base ends 41 and 72 are connected to the corresponding support holes. Hole 1
When press-fitted into the 2f and 12g as described above, the air in the stepped cylindrical hollow portions J of the support holes 12f and 12g is pushed outward from the small-diameter portions J3 by the base ends 41 and 72. . Therefore, the base portions 41 and 72 can be sufficiently pressed into the corresponding small-diameter portions J3 of the corresponding support holes 12f and 12g, and the air in the support holes 12f and 12g expands. Also flows out of each small diameter portion J3 to the outside on the outer surface side of the upper wall 12. Therefore, the press-fitted state of the base ends 41, 72 into the support holes 12f, 12g can be favorably maintained without the base ends 41, 72 coming out of the small diameter portion J2. Other functions and effects are the same as those of the first embodiment.

(Fourth Embodiment) FIGS. 5 and 6 show a fourth embodiment of the present invention. In the fourth embodiment, in each of the cylindrical support holes 12f and 12g of the upper wall 12 of the casing member 10a described in the third embodiment, the hollow section J having a cylindrical cross section has a small diameter section J3. Instead, it has a cylindrical rib portion J4. This rib portion J4 has a plurality of ribs a.
Each of these ribs a is formed to protrude in an isosceles triangular cross section from the inner peripheral surface of the hollow portion having the same diameter as the large diameter portion J2 toward the axis of the rib portion J4. I have. Here, the ribs a are located at predetermined intervals along the circumferential direction of the rib J4, and the ribs a are located along the axial direction of the rib J4. The top of each rib a of the rib J4 is located on the inner peripheral surface of the small diameter portion J3. Other configurations are the same as those of the third embodiment.

In the fourth embodiment configured as described above, similarly to the third embodiment, both support shafts 40a, 7a
0c at each of the base end portions 41 and 72 at the corresponding support hole 1
When pressed into 2f, 12g, both support shafts 40a, 70c
Can be kept parallel to each other by the upper wall 12.

Here, when press-fitting the two support shafts 40a and 70c, the respective base ends 41 and 72 are formed into the corresponding ribs J4 through the corresponding large-diameter portions J2. As described above, the base portions 41 and 72 are located on the inner peripheral surface of the small diameter portion J3 described in the third embodiment.
Is pressed into each corresponding rib portion J4 by crushing each rib a. Accordingly, the press-fitting of the support shafts 40a and 70c into the corresponding rib portions J4 can be properly performed. Other functions and effects are the same as those of the third embodiment.

(Fifth Embodiment) FIGS. 7 and 8 show a fifth embodiment of the present invention. In the fifth embodiment, in the upper wall 12 of the casing member 10a described in the third embodiment (see FIG. 4), the support hole 12b has a plurality of ribs b, and the support hole 12c has a plurality of ribs. It has a rib c.
As shown in FIG. 7 and FIG.
Each rib c extends outwardly from the outer peripheral surface of the support hole portion 12c to the inner concave portion of the wall 12 to form a triangular wall shape. I do. In addition, each support hole 12b, 12c is
The second inner opening d has a tapered cross section. Other configurations are the same as those of the first embodiment.

In the fifth embodiment configured as described above, similarly to the first embodiment, both support shafts 40a, 70a
c at each of the base end portions 41 and 72 and the corresponding support hole 12.
b, 12c, when both support shafts 40a, 70c
Can be kept parallel to each other by the upper wall 12.

As described above, the plurality of ribs b are formed in a triangular wall shape on the outer peripheral surface of the support hole 12b, and the plurality of ribs c are formed in a triangular wall shape on the outer peripheral surface of the support hole 12c. ing. Therefore, the support hole 1 of the support shaft 40a
At the time of press-fitting into the 2b, the support holes 12b are prevented from radially and outwardly deformed by the ribs b. This allows
The support hole 1 when the support shaft 40a is inserted into the support hole 12b.
2b can be prevented from cracking.

When the support shaft 70c is pressed into the support hole 12c, the support hole 12c is prevented from being deformed radially and outward by the ribs c. Thereby, the support shaft 7
The press-fitting of the support shafts 40a, 70c into the corresponding support holes 12b, 12c can be appropriately maintained while preventing the support hole 12c from breaking into the support hole 12c at 0c.
The openings d facilitate press-fitting of the support shafts 40a, 70c into the support holes 12b, 12c. Other configurations are the same as those of the first embodiment.

In implementing the present invention, unlike the first embodiment, each support hole 1 of the upper wall 12 is formed on the lower wall 11.
Each support hole corresponding to 2b, 12c is formed in a penetrating shape,
Even when the distal ends of the support shafts 40a and 70c are press-fitted into these support holes, substantially the same functions and effects as in the above embodiment can be achieved. This is substantially the same in other embodiments.

In practicing the present invention, each of the cylindrical support holes 12b and 12c formed in the upper wall 12 of the casing 10a described in the first embodiment is replaced with the upper wall 12
May be adopted, and the base ends of the support shafts 40a and 70c may be press-fitted into these through-holes.

In practicing the present invention, various motors may be used instead of the step motor M.

In practicing the present invention, the present invention is not limited to a meter for a passenger car, but may be generally applied to a meter for a vehicle other than a vehicle, a meter for a boat, and other various meters.

[Brief description of the drawings]

FIG. 1 is a sectional view of a main part showing a first embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a state in which a casing member is press-fitted into both support holes of an upper wall with both support shafts of FIG. 1;

FIG. 3 is a partial sectional view showing a main part of a second embodiment of the present invention.

FIG. 4 is a partial sectional view showing a main part of a third embodiment of the present invention.

FIG. 5 is a sectional view taken along line 5-5 in FIG.

FIG. 6 is a partial plan view showing a main part of a fourth embodiment of the present invention.

FIG. 7 is a sectional view taken along line 7-7 in FIG.

FIG. 8 is a partial plan view showing a main part of a fifth embodiment of the present invention.

[Explanation of symbols]

10 ... casing, 10a, 10b ... casing members,
11 lower wall, 12 upper wall, 12b, 12c, 12d, 1
2e, 12f, 12g: Support hole, 20: Pointer shaft, 30
... output stage gears, 40a, 70c ... support shafts, 41, 72 ...
Base end, 60: input gear, 70: magnet rotor,
G: reduction gear train, J2: large diameter part, J3: small diameter part, J4 ...
Rib, M: Step motor.

Claims (3)

[Claims] 1. A casing (10) formed by assembling both casing members (10a, 10b) together, and a pointer shaft (20) rotatably supported by opposing walls (11, 12) of the casing members. ), And at least first and second metal support shafts (40a, 70c) supported between the opposing walls of the casing members.
An electric motor (M) mounted in the casing and having a rotor (70) rotatably supported by the first support shaft; an input gear (60) driven by the electric motor; Output stage gear (30) supported so as not to rotate relative to the shaft
And an intermediate gear (40, 50) rotatably supported by the second support shaft so as to mesh between the input stage gear and the output stage gear, and a reduction gear accommodated in the casing. In the instrument rotating internal machine provided with the gear train (G), one of the opposing walls (12) of the two casing members is a base end (41, 72) of the first and second support shafts. At each corresponding portion, the support holes (12b, 12c, 12
d, 12e, 12f, and 12g) are formed in a penetrating manner and in parallel with each other. Pressed coaxially into the hole,
An inner rotating device for an instrument, wherein the inner rotating device extends toward the other opposing wall (11). 2. The first and second support holes extend cylindrically from an inner surface of the one opposing wall toward the other opposing wall along an axial direction of the first and second support shafts. For each of the first and second support holes, the inner diameter of the extension end side axial hollow portion (J2) of the support hole is the extension of the extension of the support hole. The inner diameter of the remaining axial hollow portion (J3, J4) excluding the end-side axial hollow portion is larger than the inner diameter, and each base end portion of the first and second support shafts is located in a corresponding support hole portion. 2. The rotary instrument according to claim 1, wherein the instrument is inserted through the axial hollow portion on the extension end side and press-fitted into the remaining axial hollow portion. 3. 3. The first and second support holes extend cylindrically from the inner surface of the one opposing wall toward the other opposing wall along the axial direction of the first and second support shafts. And for each of the first and second support holes, between the outer peripheral surface of the periphery of the support hole and the area of the inner surface of the one opposing wall near the support hole. 2. The instrument rotating internal machine according to claim 1, wherein a plurality of plate-shaped ribs (b, c) are formed on the rotating body. 3.