KR100358462B1 - Vibration generating apparatus of a small radio pager - Google Patents

Abstract

An object of the present invention is to provide a vibration generating device of a small radio apparatus which can improve the vibration efficiency by efficiently operating the eccentric load of the vibrator and can improve the productivity of the vibrator and the whole apparatus.

In the vibration generating device of a small radio, which is formed by integrally coupling the vibrator 3 to the rotating shaft 2 of the motor, the vibrator 3 is provided with a groove portion 3B into which the rotating shaft 2 is inserted, and this groove portion ( In the side walls 3C, 3C forming 3B, the opening side end surface of the groove portion 3B is pushed and pushed in the direction from the opening side of the groove portion 3B toward the bottom side, so as to be rotated with the rotary shaft 2. Combined integrally.

Description

VIBRATION GENERATING APPARATUS OF A SMALL RADIO PAGER}

The present invention relates to a vibration generating device used for, for example, calling of a small radio such as a cellular phone.

Background Art In recent years, as a kind of paging type small pager, a type incorporating a vibration generating device formed by eccentrically coupling a high-gravity metal vibrator to a rotating shaft of a motor has become widespread. Instead of generating a ringing tone, a small wireless pager incorporating such a vibration generating device generates vibration by the rotation of the vibrator, so that reception can be confirmed without others even in public places or during meetings.

Conventionally, as shown in FIG. 17, the vibration generating apparatus of the small radio of this kind is provided by integrally coupling the vibrator 10 to the rotating shaft 2 of the small motor 1 connected to the signal generating circuit of the small radio. It is composed. The vibrator 10 is made of a high specific gravity metal formed by a powder metallurgy method, is formed in a substantially semi-circular columnar shape, and has a cross-section "U" at the center of the eccentric load part 10A of the fan-shaped part which is eccentric from the axis O. 'Shaped groove portion 10B is formed, side walls 10C and 10C forming the groove portion 10B are projected outwardly opposite to the eccentric load portion 10A, and the tapered portion 10D is formed. , 10D).

When the rotary shaft 2 and the vibrator 10 are coupled to each other, as shown in FIGS. 18 and 19, the support jig 11 receives the vibrator 10 having the rotary shaft 2 inserted into the groove 10B. After positioning, the mold 12 is lowered and the taper portions 12A and 12A are pressed to press the tapered portions 10D and 10D of the sidewalls 10C and 10C of the vibrator 10 to form the entire sidewalls 10C and 10C. Is plastically deformed to be bent toward the rotating shaft 2 so as to cover the upper side of the rotating shaft 2, and brought into close contact with the rotating shaft 2.

In the conventional vibration generating apparatus, in order to secure the required coupling force, when the side walls 10C and 10C are plastically deformed toward the rotating shaft 2, the upper end portions of the side walls 10C and 10C need to cover the upper part of the rotating shaft 2. Therefore, it is necessary to raise the bulging height of the side wall 10C, 10C to some extent, and as a result, the load on the opposite side of the eccentric load part 10A becomes large, and the eccentric action of the eccentric load part 10A by that much. There is a problem that the vibration efficiency is deteriorated by reducing the pressure.

Further, the tapered portions 10D and 10D of the side walls 10C and 10C of the vibrator 10 are pressed, and the side walls 10C and 10C are plastically deformed toward the rotation shaft 2 and bent toward the rotation shaft 2 to rotate the rotation shaft 2. The bending stress is applied to the sidewalls 10C and 10C because they are in close contact with each other. However, since the vibrator 10, which is a powder-molded product, is easily broken due to its material, cracks are likely to occur at the source of the tapered portions 10D and 10D. It was difficult to suppress the occurrence of cracks while achieving high specific gravity.

Moreover, since the whole side wall 10C, 10C is plastically deformed, there existed a problem which requires a big press force.

SUMMARY OF THE INVENTION An object of the present invention is to provide a vibration generating device of a small radio apparatus which can improve the vibration efficiency by efficiently operating the eccentric load of the vibrator and can improve the productivity of the vibrator and the whole apparatus.

BRIEF DESCRIPTION OF THE DRAWINGS The top view of the vibrator in 1st Example of this invention.

FIG. 2 is a cross-sectional view taken along the line II-II of FIG. 1. FIG.

Fig. 3 is a cross sectional view showing a state before the start of the coking operation of the rotating shaft in the first embodiment of the present invention.

4 is a longitudinal cross-sectional view showing a state before the start of the coking operation of the rotating shaft in the first embodiment of the present invention.

Fig. 5 is a cross sectional view showing a state during caulking of the rotating shaft in the first embodiment of the present invention.

Fig. 6 is a longitudinal sectional view showing a state in which a rotating shaft is caulking in a first embodiment of the present invention.

Fig. 7 is an enlarged cross-sectional view of a coupling portion between a rotating shaft and a vibrator in the first embodiment of the present invention.

8 (a) to 8 (c) are plan views illustrating different modifications of the vibrator according to the first embodiment of the present invention.

9 (a) to 9 (c) are plan views for explaining different modifications of the vibrator according to the first embodiment of the present invention.

10 (a) to 10 (c) are plan views for explaining different modifications of the vibrator according to the first embodiment of the present invention.

Fig. 11 is a plan view for explaining still another modification of the vibrator in the first embodiment of the present invention.

12 is a cross-sectional view taken along the line XII-XII of FIG. 11.

Fig. 13 is a plan view for explaining still another modification of the vibrator according to the first embodiment of the present invention.

14 is a cross-sectional view taken along the line XIV-XIV in FIG. 13.

Fig.15 (a)-(e) is sectional drawing of the principal part for demonstrating the different modification of the vibrator in 1st Example of this invention.

16 is a side view for explaining a second embodiment of the present invention.

17 is a perspective view of a conventional vibration generating device.

18 is a cross sectional view showing a state before a caulking operation of a rotating shaft in the related art.

Fig. 19 is a cross sectional view showing a state during a caulking operation of a rotating shaft in the related art.

<Explanation of symbols for main parts of drawing>

1: small motor (motor)

2: axis of rotation

3: vibrator

3A: Eccentric Load

3B: groove

3C: sidewall

4: supporting jig

5: caulking punch

5B: Tip

The invention described in claim 1 is a vibration generating device of a small radio which is formed by integrally coupling the vibrator 3 to the rotating shaft 2 of the motor 1, wherein the vibrator 3 is an eccentric load portion. The groove part 3B in which the said rotating shaft 2 is inserted in 3A is formed, and in the side wall 3C which protrudes from the end surface of the said eccentric load part 3A, and forms the said groove part 3B. The recessed portion in the width direction of the cross section is formed by a caulking punch whose width dimension of the tip portion is smaller than the width dimension of the cross section in the direction orthogonal to the axis line O of the groove portion 3B. It is characterized in that it is integrally coupled to the rotary shaft 2 by pushing and pushing in the direction from the opening side of the groove portion 3B toward the bottom side to be formed.

The invention described in claim 2 is characterized in that the groove portion of the vibrator is formed to have a size incorporating a range of 180 ° or more of the center angle of the rotating shaft. According to the invention described in the scope 3, the outer side surface 3C ₁ according to claim 1 or 2 located on the side opposite to the groove portion 3B in the side wall 3C has the lower eccentricity. It is characterized by being formed in the arc-shape recessed toward the center part.

The vibration generating device for a small radio apparatus according to the present invention forms a groove portion into which a rotating shaft is inserted, and a tip end portion of the side wall forming the groove portion rather than the width dimension of the cross section in a direction orthogonal to the axis line of the groove portion on the side wall forming the groove portion. The coarse punch of small width dimension of the cross section is pushed in the direction from the opening side of the groove to the bottom side so that the recess is formed in the width direction of the cross section, thereby integrally combining the rotating shaft and the vibrator, thereby increasing the bulging protruding height of the side wall. To reduce the vibration efficiency. In addition, it is possible to make high specific gravity required while suppressing the occurrence of cracking of the vibrator. As a result, small size and light weight of the vibrator, and further, small size and light weight and low cost of the vibration generating device and the whole small radio are realized. Moreover, caulking load is made small and the productivity of a vibration generating apparatus is improved.

(First embodiment)

1 to 15 (a) to (e) are views for explaining the first embodiment of the present invention and modifications thereof.

In the vibration generator of the small radio apparatus of the present embodiment, the vibrator 3 having a shape as shown in Figs. 1 and 2 is provided with respect to the rotation shaft 2 of the small motor (motor) 1 in the above-described conventional example. It is composed of a unitary combination. The vibrator 3 is made of a high specific gravity metal formed by powder metallurgy, and is formed in a substantially semicircular columnar shape centering on the axis O, and the entire fan-shaped part eccentric from the axis O is an eccentric load part ( 3A). Reference numeral 3B denotes a groove portion having a substantially semicircular cross section extending along the axis O, and having an inner diameter into which the rotating shaft 2 made of steel having a circular cross section is inserted. The side walls 3C and 3C forming the groove portion 3B protrude bulging downward in FIG. 1 from the axis O, and the groove portion 3B is formed over a range of 180 ° or more centering on the axis O. have. Therefore, the groove portion 3B has a range of 180 ° or more in the center angle of the rotation shaft 2. The outer surface (3C ₁₎ a groove (3B) in the side wall (3C) and which is located on the opposite side is formed in an arc shape into the cavity toward the eccentric loading (3A). The radius of the arc of this outer surface 3C ₁ is set to the same dimension as, for example, the bulging height of the side wall 3C.

When the rotary shaft 2 and the vibrator 3 are coupled, the rotary shaft 2 is first inserted into the groove portion 3B of the vibrator 3 from the direction of the axis O, and then the vibrator 3 is shown in FIGS. 3 and 4. Positioning is performed by the supporting jig 4 as shown in FIG. The supporting jig 4 is formed with an arc surface portion 4A in contact with the arc-shaped outer circumferential surface 3D of the vibrator 3. 4B is a stopper part for preventing the rotational movement displacement of the vibrator 3 centered on the axis O. As shown in FIG.

The caulking punch 5 has a horizontal surface portion 5A at its tip and two tip portions 5B and 5B formed of convex portions projecting downwardly from the horizontal surface portion 5A to the axis O of the rotary shaft 2. It is formed side by side in two rows in parallel. The tip portion 5B is a thin rectangular elongated horizontal section, and is formed in a truncated square pyramid shape gradually expanding upward. A relief portion 5C which is recessed toward the rear end side is formed between the tip portions 5B and 5B.

And by the front-end | tip part 5B, 5B of this caulking punch 5, as shown to FIG. 5 and FIG. 6, the opening side of the groove part 3B in the side wall 3C, 3C of the vibrator 3 is shown. The cross section is pushed downward by pushing downward along the axis O of the rotation shaft 2 over a predetermined range. The sidewalls 3C and 3C caulked in this way are plastically deformed so that the recesses 6 and 6 are formed, as shown in FIG. 7, whereby the inner surface of the groove 3B and the rotating shaft 2 closely adhere to each other. Thus, the vibrator 3 and the rotating shaft 2 are integrally coupled.

Thus, the groove part 3B which inserts the rotating shaft 2 is formed, and pushes the opening side end surface of the groove part 3B in the side wall 3C, 3C of this groove part 3B, and the rotary shaft 2 and the vibrator ( 3) integrally combined, so that the side walls (10C, 10C) are plastically deformed by bending the side walls (10C, 10C) toward the rotating shaft (2) in order to secure the required coupling force as in the prior art, the upper end of the rotating shaft (2) Since it is not necessary to cover the upper portion, the bulging protruding height of the side walls 3C and 3C of the grooves 3B and 3B can be reduced as compared with the conventional one, and the eccentric load of the vibrator 3 can be effectively reduced. The vibration efficiency can be improved. In addition, since bending stress is not applied to the side walls 10C and 10C as in the related art, the content of tungsten (W) is increased by suppressing the occurrence of cracking of the vibrator 3 without much consideration of toughness. High specific gravity of 3) can be aimed at. As a result, it is possible to realize miniaturization and weight reduction of the vibrator, furthermore, miniaturization and cost reduction of the vibration generating apparatus and the entire small radio.

In addition, in the side walls 3C and 3C on both sides of the groove portion 3B, the opening side end face of the groove portion 3B is pushed down and caulked, so that the whole side wall 10C and 10C may be plastically deformed and not bent as in the prior art. Therefore, the caulking load can be reduced as compared with the conventional case.

In addition, since the outer surface 3C _{1 of the} side wall 3C is formed in an arc shape, when the side wall 3C is pushed and pressed, the stress concentration is concentrated on the source side of the side wall 3C on the outer surface 3C ₁ . Can be prevented from occurring.

By the way, the vibrator 3 is made of a super-alloy material having a specific gravity of about 17 to 19, such as W-Ni, W-Ni-Fe, W-Ni-Cu, or W-Mo-Ni-Fe, for example. It is molded by powder metallurgy. Specific examples include W powder; 89 to 98% by weight and Ni powder; Cu, to a mixed powder having a composition of 1.0 to 11 wt% or to the W powder and Ni powder in the above wt% range; 0.1 to 6% by weight of Fe powder; 0.1 to 6% by weight of Mo powder; 0.1 to 6% by weight and Co powder; The mixed powder of the composition containing one type or two types or more in 0.1-5 weight% is pressed into a fan shape at 1 ton / cm <2> -4 ton / cm <2>, and this green compact is 0 degreeC-- After liquid phase sintering in a dew point hydrogen gas stream or ammonia decomposition gas at 60 ° C., and then heating in a temperature range of 700 ° C. to 1430 ° C. ± 30 ° C. in any of vacuum, neutral or reducing atmospheres, The heat treatment which quenched by the cooling rate of 40 degree-C / min or more to at least 300 degreeC is performed.

In the composition of the vibrator 3, when the content of W (tungsten) exceeds 98% by weight, the malleability decreases, resulting in high specific gravity, and when the content of W (tungsten) is not 89% by weight, a predetermined specific gravity cannot be obtained. This makes it unsuitable for this type of oscillator. Moreover, even when content of Ni (nickel) exceeds 11 weight%, a predetermined specific gravity cannot be obtained, and when it is not 1.0 weight%, sinterability will not progress. In addition, Co (cobalt) has the same effect as Ni, but when it is less than 0.1% by weight, the effect of sufficient addition cannot be obtained, while on the other hand, even when it exceeds 5% by weight, the corresponding effect is not obtained, making it uneconomical in manufacturing. . In addition, although Cu powder and Fe powder can reduce sintering temperature by containing these, predetermined specific gravity cannot be obtained above the said upper limit.

Moreover, the specific example of the dimension of the rotating shaft 2, the vibrator 3, etc. is as follows. The diameter D of the rotating shaft 2 is 0.8 mm, the outer diameter R1 of the vibrator 3 is 3.0 mm, the length L1 of the vibrator 3 is 3.0 mm, and the inner diameter R2 of the groove 3B is 0.4. Mm, the height H1 of the side wall 3C is 0.25 mm, and the width W1 of the formation region of the side walls 3C, 3C is 2.5 mm. The tip 5B of the caulking punch 5 has a height H2 of 0.3 mm, a tip width W2 of 0.2 mm, a base width of W3 of 0.7 mm, and a length of L2. Is 2 mm, the inclination angles θ1 and θ2 of both side portions and both ends are 40 °, the distance L3 between the center lines of the tip portions 5B and 5B is 1.6 mm, and the pushing depth H3 at the time of pushing is 0.25 mm. to be.

In addition, in the present embodiment, as shown in Fig. 7, the recesses 6 and 6 are provided with grooves (for openings of end faces of the grooves 3B in the side walls 3C and 3C of the vibrator 3). 3B), but side and the outer side surface (3C ₁₎ while leaving a portion that is depressed to push each of the side, along the axis (O) of the rotating shaft (2) by pressing only the central portion pushed over a predetermined range so as to caulking, and instead, a groove The part which is not pushed only to the side (3B) may be left, and the other part may be pushed and caulked to reach the outer side surface 3C ₁ over the predetermined range along the axis O of the rotating shaft 2, and may be pressed. Or to leave the part which is not pushed only to the outer side surface 3C ₁ side, and presses and crimps the other part along the axis O of the rotating shaft 2 until it reaches the groove part 3B over the predetermined range. You may also do it. In the latter case, since the groove 3B side is in an open state, the cracks may be generated at the bottom of the groove 3B side of the recess 6 in the recess 6. There is an advantage that no cracking occurs.

FIG.8 (a)-(c) and FIG.9 (a)-(c) are figures for demonstrating the modification of the vibrator 3 in a present Example. As shown in Fig. 8A, an arc-shaped circular arc surface (pitted toward the eccentric load portion 3A toward the outer circumferential surface 3D of the arc shape from the opening side end face of the groove portion 3B in the side wall 3C ( 3E) is formed. In FIG. 8A, instead of the circular arc surface 3E recessed toward the eccentric load portion 3A, a circular arc surface protruding outwardly from the eccentric load portion 3A side may be used. . In addition, as shown in FIG. 8B, in the same way as in the first embodiment, when the side wall 3C is pushed, the stress concentration occurring at the root side of the side wall 3C on the outer side surface 3C ₁ . in order to prevent cracks due to an outer surface (3C ₁₎ the horizontal surface (3F) which is located at the bottom of the in between is formed as a circular arc, the outer surface (3C ₁₎ and the outer surface (3D), the axis (O) is Formed. In addition, what is shown in FIG.8 (c) is formed in the shape which extended the side wall 3C to the peripheral position of the outer peripheral surface 3D.

9A, the outer surface 3C _{2 of the} side wall 3C is a plane parallel to the direction from the opening side of the groove portion 3B toward the bottom side and parallel to the axis O. When the inclined surface 3G is formed between the outer side surface 3C ₂ and the outer circumferential surface 3D and these joint portions push the side walls 3C, cracks due to stress concentration occur in the joint portions. In order to prevent that from happening, the rounding process is carried out, and the circular arc is recessed toward the eccentric load portion 3A. 9B, the outer side surface 3C ₂ is formed similarly to FIG. 9A, and FIG. 9B is provided between the outer side surface 3C ₂ and the outer peripheral surface 3D. At the same time, the horizontal surface 3H is formed at approximately the same height as the bottom of the groove portion 3B, and the joint portion between the outer surface 3C ₂ and the horizontal surface 3H is the same as in FIG. 9 (a), In order to prevent cracking by stress concentration in this joining part, it is circular arc-shaped recessed toward 3 A of eccentric load parts. In addition, what is shown in FIG.9 (c) is formed in the shape which extended the side wall 3C as the inclined surface to the outer peripheral surface 3D.

10 (a) to 10 (c) are diagrams for explaining another modification of the vibrator 3 in the present embodiment. As shown in Fig. 10A, the cross section along the axis O on the outer surfaces 3I, 3I between the side wall 3C of the eccentric load portion 3A and the outer peripheral surface 3D of the arc shape is a semi-circular notch. Grooves 3J and 3J are formed, and in Fig. 10B, notch grooves 3K and 3K having a triangular cross section along the axis O are formed on the outer surfaces 3I and 3I. As shown in (c), it is a shape in which the notch groove | channel 3L, 3L whose cross section is rectangular along the axis O is formed in outer surface 3I, 3I. Thus, when the notch grooves 3J, 3K, and 3L are formed at positions close to the axis O of the eccentric load portion 3A, the center of the eccentric load is farther from the axis O, so that the vibrator 3 While reducing the weight, the eccentric load can be efficiently operated, and the vibration efficiency can be improved.

11-14 is a figure for demonstrating the further modification of the vibrator 3 in a present Example. On both end surfaces 3M and 3M of the vibrator 3 shown in FIG. 11 and FIG. 12, the fitting recessed part 3N by which the bearing part of a small motor is fitted is formed, respectively. Moreover, fitting recessed parts 3Q and 3Q in which the bearing parts of a small motor are fitted are formed in the both end surfaces 3P and 3P of the vibrator 3 shown to FIG. 13 and FIG. 14, respectively. According to such a vibrator 3, when the small motor 1 and the vibrator 3 are integrated, the dimension of the axis line O direction can be shortened. The fitting recesses 3N and 3Q may be provided only at one end face 3M and 3P.

15A to 15E are views for explaining a modification of the groove portion 3B of the vibrator 3 in the present embodiment. In the case of Fig. 15A, the side wall of the groove having a rectangular cross section is narrowed inward, and in the case of Fig. 15B, the side wall of the groove having a substantially pentagonal cross section is narrowed inward. In the case of Fig. 15 (c), the groove is a U-shaped groove, and in the case of Fig. 15 (d), the groove is a substantially rectangular cross section. The bottom face has a wedge-shaped shape. All of these groove parts 3B are formed in the magnitude | size which contains the range of 180 degrees of the center angles of the rotating shaft 2. In FIGS. 15C to 15E, the rotational shaft 2 can be inserted into the groove 3B from the upper side and caulked to be engaged, whereby the working speed can be increased and the working efficiency can be improved.

(2nd Example)

16 is a diagram for explaining a second embodiment of the present invention.

In the present embodiment, the tip portions 5B, 5B of the caulking punch 5 are formed in series along the axis O direction of the rotation shaft 2, and the tip portions 5B, 5B arranged in series are rotated shafts ( It is formed side by side in 2 rows parallel to the axis O of 2), and total 4 tip part 5B is formed. And the opening side end surface of the groove part 3B in the side wall 3C, 3C of the vibrator 3 is pushed down, and the recessed part of two points is formed along the axis line O direction, respectively, and this is a groove part The inner surface of the 3B and the rotating shaft 2 are in close contact with each other so that the vibrator 3 and the rotating shaft 2 are integrally coupled to each other.

As described above, according to the invention described in claims 1 to 3, the groove portion into which the rotation shaft is inserted is formed, and the opening side end surface of the groove portion is orthogonal to the axis of the groove portion in the side wall forming the groove portion. The rotary shaft and the vibrator are integrally coupled by pushing the opening from the opening side of the groove toward the bottom so that a recess is formed in the width direction of the cross section by a caulking punch having a width dimension of the tip portion smaller than the width dimension of the cross section. Therefore, in order to secure the coupling force required as in the prior art, when the side wall is plastically deformed toward the rotating shaft, it is not necessary to cover the upper portion of the rotating shaft when the side wall is plastically deformed, so that the bulging of the side wall of the groove portion is projected. Height can be reduced, and the vibration efficiency can be effectively Can be improved. In addition, since bending stress is not applied to the side walls as in the related art, the specific gravity of the vibrator can be increased by increasing the content of tungsten (W) without considering the toughness while suppressing cracking of the vibrator. As a result, it is possible to realize miniaturization and weight reduction of the vibrator, and furthermore, miniaturization and cost reduction of the vibration generating apparatus and the entire small radio.

In addition, since the end face of the groove portion is pushed and caulked on both sidewalls forming the groove portion, the whole side wall does not need to be bent by plastic deformation as in the prior art, so that the caulking load can be reduced as compared with the conventional one.

Further, according to the invention described in claim 2, by forming the groove portion of the vibrator so as to have a range of 180 ° or more of the center angle of the rotation shaft, the rotation shaft is more reliably constrained in the groove portion of the vibrator, thereby increasing their bond strength more. According to the invention as recited in claim 3, in the side wall, the outer surface located on the side opposite to the groove portion is formed into an arc-shaped recess in the eccentric load portion. The occurrence of cracks due to stress concentration can be prevented.

Claims (3)

In the vibration generating device of the small radio, which is formed by integrally coupling the vibrator (3) to the rotating shaft (2) of the motor (1), The vibrator 3 is provided with a groove portion 3B into which the rotary shaft 2 is inserted into the eccentric load portion 3A, and protrudes from a cross section of the eccentric load portion 3A to thereby open the groove portion 3B. The opening side end surface of the groove part 3B in the side wall 3C to be formed has a width dimension of the tip end portion smaller than the width dimension of the end section in the direction orthogonal to the axis line O of the groove part 3B. Vibrating device of the compact radio, characterized in that it is integrally coupled with the rotating shaft (2) by pushing and pushing in the direction from the opening side of the groove portion 3B toward the bottom side so that the concave portion is formed in the width direction of the cross section. . The vibration generating device as set forth in claim 1, wherein the groove portion (3B) of the vibrator (3) is formed to have a size incorporating a range of 180 ° or more of the center angle of the rotating shaft (2). Claim 1 or that of claim 2, wherein the outer surface (3C ₁₎ which is located opposite side of the groove (3B) in the side wall (3C) is formed in a circular arc into the cavity toward the eccentric loading Vibration generating device of a small radio characterized in that.