WO2002063746A1 - Vibration motor - Google Patents

Vibration motor Download PDF

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Publication number
WO2002063746A1
WO2002063746A1 PCT/JP2002/000640 JP0200640W WO02063746A1 WO 2002063746 A1 WO2002063746 A1 WO 2002063746A1 JP 0200640 W JP0200640 W JP 0200640W WO 02063746 A1 WO02063746 A1 WO 02063746A1
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WO
WIPO (PCT)
Prior art keywords
weight
rotary shaft
vibration motor
caulking
section
Prior art date
Application number
PCT/JP2002/000640
Other languages
French (fr)
Inventor
Toshiaki Tsuzaki
Eiichi Ibata
Original Assignee
Matsushita Electric Industrial Co., Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Matsushita Electric Industrial Co., Ltd. filed Critical Matsushita Electric Industrial Co., Ltd.
Publication of WO2002063746A1 publication Critical patent/WO2002063746A1/en

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
    • H02K7/06—Means for converting reciprocating motion into rotary motion or vice versa
    • H02K7/061—Means for converting reciprocating motion into rotary motion or vice versa using rotary unbalanced masses

Definitions

  • the present invention relates to a structure of a vibration motor, mounted to a radio paging-device or a cellular phone, informing a user of a calling or a message arrival by making the user sense vibrations.
  • a radio paging-device such as a pager has informed a user of a calling by sound; however, the sound sometimes jars on ears of other persons, e.g., attending a meeting. Instead of the sound, vibrations are used for informing only a user of a calling.
  • a vibration motor as a source of vibrations, is thus mounted to a radio paging-device.
  • the motor has an unbalance weight mounted to a rotary shaft, and rotating the motor causes the weight to rotate, thereby producing vibrations.
  • Radio paging-devices have been downsized because batteries and other parts have been downsized, and a card-size radio paging-device is now available on the market. The market demands a more compact and thinner device, therefore, a vibration motor is required to be further downsized and yet produce greater vibrations.
  • Fig. 6 is a perspective view of a conventional vibration motor
  • Fig. 7 is a partial sectional view of the motor shown in Fig. 6.
  • rotary shaft 102 of motor 101 is journaled by bearing 103.
  • Rotary shaft 102 has unbalance weight 104 at its tip.
  • Unbalance weight 104 has groove 106 axially, and rotary shaft 102 is placed in groove 106.
  • Caulking section 141 on the bank of groove 106 is caulked, thereby fixing weight 104 to rotary shaft 102.
  • Unbalance weight 104 is made of metal having a high specific gravity such as tungsten, and plated for rust prevention.
  • the rotation of motor 101 rotates weight 104, and an unbalance gravity of weight 104 produces vibrations, thereby vibrating the entire motor.
  • This vibration motor is mounted to a device, so that the entire device is vibrated for informing a user of a calling.
  • the present invention addresses the problems discussed above, and aims to provide an inexpensive and small-size vibration motor producing greater vibrations and being strong against shocks.
  • the vibration motor of the present invention comprises the following elements: an unbalance weight — provided to a rotary shaft — having a rest section for receiving the rotary shaft and a caulking section for caulking the weight to the rotary shaft; and the rotary shaft having a recess at a place corresponding to the rest section. Caulking strength applied to the caulking section forces parts of the weight to bite the inside of the recess, thereby fixing the weight to the rotary shaft. This structure allows the rotary shaft to hold the weight tightly.
  • Fig. 1 is a perspective view of a vibration motor in accordance with a first exemplary embodiment of the present invention.
  • Fig. 2 is a sectional view of an unbalance weight of the vibration motor shown in Fig. 1.
  • Fig. 3 is a perspective view of a vibration motor in accordance with a second exemplary embodiment of the present invention.
  • Fig. 4 is a sectional view of an unbalance weight of a vibration motor in accordance with a third exemplary embodiment of the present invention.
  • Fig. 5 is a diagram comparing respective holding-strengths of an unbalance weight to a rotary shaft in the present invention and that of a conventional one.
  • Fig. 6 is a perspective view of a conventional vibration motor.
  • Fig. 7 is a sectional view of an unbalance weight of the motor shown in Fig. 6.
  • Fig. 1 is a perspective view of a vibration motor in accordance with the first exemplary embodiment of the present invention.
  • Fig. 2 is a sectional view of an unbalance weight of the vibration motor shown in Fig. 1.
  • rotary shaft 2 of motor 1 is journaled by bearing 3.
  • Rotary shaft 2 has weight 4 at its tip, and weight 4 has axial groove 6, which functions as a rest section for receiving rotary shaft 2.
  • recess 5 is provided to a part —corresponding to groove 6— of rotary shaft 2.
  • Weight 4 includes caulking section 41 on the bank which forms groove 6. When weight 4 is fixed to rotary shaft 2, caulking strength applied to caulking section 41 forces parts of weight 4 to bite the inside of recess 5 formed on rotary shaft 2.
  • Fig. 5 is a diagram comparing respective holding-strengths of an unbalance weight to a rotary shaft in the present invention and that of a conventional one. As illustrated in Fig. 5, the strength of holding the weight according to the present invention is approx. doubled that of the conventional one.
  • FIG. 3 is a perspective view of a vibration motor in accordance with the second exemplary embodiment of the present invention.
  • the second embodiment differs from the first one in the following points: Hole 40 is formed on weight 4 in an axial direction of weight 4, and caulking section 41 is provided to weight 4.
  • Hole 40 functions as a rest section through which rotary shaft 2 is inserted, and rotary shaft 2 has recess 5 at a place corresponding to hole 40.
  • caulking strength applied to caulking section 41 forces parts of weight 4 to bite the inside of recess 5 of rotary shaft 2. This structure allows the rotary shaft to hold the weight tightly.
  • Fig. 4 is a sectional view of an unbalance weight of a vibration motor in accordance with the third exemplary embodiment of the present invention.
  • the third embodiment differs from the first one in the following points:
  • Weight 4 has step 43 shaping in a recess on an axial end face, so that swelling section 42 does not overhang the axial end face of weight 4 when caulking section 41 is caulked to rotary shaft 2.
  • This structure allows the motor in accordance with the third embodiment to hold the weight with the rotary shaft tightly and to be fit in a small space of a device.
  • a vibration motor in accordance with the fourth embodiment has one of the structures of the first through third embodiments, and an unbalance weight of the motor has the following structure:
  • the weight of the vibration motor in accordance with the fourth embodiment is mainly made of metal having a high specific gravity such as tungsten and formed by a sintering method, so that the weight has numbers of holes, which are to be impregnated with oil. As a result, as shown in table 1, the weight obtains much better rust prevention than other unbalance weights having no rust-proof preparation.
  • the present invention can increase substantially the strength of holding the weight with the rotary shaft of the vibration motor comparing with that of conventional ones.
  • the embodiments also prove that the present invention can eliminate the surface treatment for rust prevention such as plating.
  • the structure, where a step is formed on an axial end face of the weight prevents the swelling section due to caulking from overhanging the axial end face of the weight. Therefore, when the vibration motor of the present invention is disposed in the space where a conventional motor was disposed, the unbalance weight can be extended axially longer than the conventional one. As a result, the mass of the weight can be increased, whereby greater vibrations can be produced.
  • the present invention thus can provide an inexpensive motor having several advantages as discussed above, which satisfy demands from the market.
  • the vibration motor of the present invention is mounted to a radio paging-device or a cellular phone, and functions as a vibration source for informing a user of a calling or a message arrival by making the user sense the vibrations.

Abstract

An unbalance weight (4) of a vibration motor (1) includes a rest section (6, 40) for receiving a rotary shaft (2) and a caulking section (41) for caulking the weight (4) to the rotary shaft (2). The rotary shaft (2) includes a recess (5) at a place corresponding to the rest section (6, 40). Caulking strength applied to the caulking section (41) forces parts of the weight (4) to bite inside of the recess (5), thereby fixing the weight (4) to the rotary shaft (2). This structure allows the rotary shaft (2) to hold the weight (4) tightly. The vibration motor (1) can be mounted to a radio paging-device or a cellular phone, so that the user can sense the vibrations to be informed of a calling or a message arrival. The vibration motor (1) is thus suited for a source of vibrations.

Description

DESCRIPTION
Vibration Motor Technical Field The present invention relates to a structure of a vibration motor, mounted to a radio paging-device or a cellular phone, informing a user of a calling or a message arrival by making the user sense vibrations.
Background Art A radio paging-device such as a pager has informed a user of a calling by sound; however, the sound sometimes jars on ears of other persons, e.g., attending a meeting. Instead of the sound, vibrations are used for informing only a user of a calling. A vibration motor, as a source of vibrations, is thus mounted to a radio paging-device. The motor has an unbalance weight mounted to a rotary shaft, and rotating the motor causes the weight to rotate, thereby producing vibrations. Radio paging-devices have been downsized because batteries and other parts have been downsized, and a card-size radio paging-device is now available on the market. The market demands a more compact and thinner device, therefore, a vibration motor is required to be further downsized and yet produce greater vibrations.
A structure of a conventional vibration motor is described hereinafter. Fig. 6 is a perspective view of a conventional vibration motor, and Fig. 7 is a partial sectional view of the motor shown in Fig. 6. In Fig. 6, rotary shaft 102 of motor 101 is journaled by bearing 103. Rotary shaft 102 has unbalance weight 104 at its tip. Unbalance weight 104 has groove 106 axially, and rotary shaft 102 is placed in groove 106. Caulking section 141 on the bank of groove 106 is caulked, thereby fixing weight 104 to rotary shaft 102. Unbalance weight 104 is made of metal having a high specific gravity such as tungsten, and plated for rust prevention.
An operation of the conventional vibration motor is described hereinafter.
The rotation of motor 101 rotates weight 104, and an unbalance gravity of weight 104 produces vibrations, thereby vibrating the entire motor. This vibration motor is mounted to a device, so that the entire device is vibrated for informing a user of a calling.
The structure discussed above; however, requires to caulk unbalance weight 104 to rotary shaft 102 strongly in order to increase the holding strength when weight 104 is mounted to rotary shaft 102. This strong caulking sometimes results in deforming rotary shaft 102. Further, as shown in Fig. 7, the caulking deforms caulking section 141, which causes an axial end face of weight 104 to swell. This swelling requires the unbalance weight per se to be smaller accordingly because the motor should be integrated into a small space of a device. The plating also increases a cost of the unbalance weight.
Summary of the Invention
The present invention addresses the problems discussed above, and aims to provide an inexpensive and small-size vibration motor producing greater vibrations and being strong against shocks.
The vibration motor of the present invention comprises the following elements: an unbalance weight — provided to a rotary shaft — having a rest section for receiving the rotary shaft and a caulking section for caulking the weight to the rotary shaft; and the rotary shaft having a recess at a place corresponding to the rest section. Caulking strength applied to the caulking section forces parts of the weight to bite the inside of the recess, thereby fixing the weight to the rotary shaft. This structure allows the rotary shaft to hold the weight tightly.
Brief Description of the Drawings
Fig. 1 is a perspective view of a vibration motor in accordance with a first exemplary embodiment of the present invention.
Fig. 2 is a sectional view of an unbalance weight of the vibration motor shown in Fig. 1. Fig. 3 is a perspective view of a vibration motor in accordance with a second exemplary embodiment of the present invention.
Fig. 4 is a sectional view of an unbalance weight of a vibration motor in accordance with a third exemplary embodiment of the present invention.
Fig. 5 is a diagram comparing respective holding-strengths of an unbalance weight to a rotary shaft in the present invention and that of a conventional one.
Fig. 6 is a perspective view of a conventional vibration motor.
Fig. 7 is a sectional view of an unbalance weight of the motor shown in Fig. 6.
Detailed Description of the Preferred Embodiments
Exemplary embodiments of the present invention are demonstrated hereinafter with reference to the accompanying drawings. (First Exemplary Embodiment) Fig. 1 is a perspective view of a vibration motor in accordance with the first exemplary embodiment of the present invention. Fig. 2 is a sectional view of an unbalance weight of the vibration motor shown in Fig. 1. In Fig. 1, rotary shaft 2 of motor 1 is journaled by bearing 3. Rotary shaft 2 has weight 4 at its tip, and weight 4 has axial groove 6, which functions as a rest section for receiving rotary shaft 2. In this first embodiment, recess 5 is provided to a part —corresponding to groove 6— of rotary shaft 2. Weight 4 includes caulking section 41 on the bank which forms groove 6. When weight 4 is fixed to rotary shaft 2, caulking strength applied to caulking section 41 forces parts of weight 4 to bite the inside of recess 5 formed on rotary shaft 2.
Fig. 5 is a diagram comparing respective holding-strengths of an unbalance weight to a rotary shaft in the present invention and that of a conventional one. As illustrated in Fig. 5, the strength of holding the weight according to the present invention is approx. doubled that of the conventional one.
(Second Exemplary Embodiment) Fig. 3 is a perspective view of a vibration motor in accordance with the second exemplary embodiment of the present invention. The second embodiment differs from the first one in the following points: Hole 40 is formed on weight 4 in an axial direction of weight 4, and caulking section 41 is provided to weight 4. Hole 40 functions as a rest section through which rotary shaft 2 is inserted, and rotary shaft 2 has recess 5 at a place corresponding to hole 40. When weight 4 is fixed to rotary shaft 2, first, rotary shaft 2 is inserted into hole 40 of weight 4, then caulking strength applied to caulking section 41 forces parts of weight 4 to bite the inside of recess 5 of rotary shaft 2. This structure allows the rotary shaft to hold the weight tightly.
(Third Exemplary Embodiment)
Fig. 4 is a sectional view of an unbalance weight of a vibration motor in accordance with the third exemplary embodiment of the present invention. The third embodiment differs from the first one in the following points: Weight 4 has step 43 shaping in a recess on an axial end face, so that swelling section 42 does not overhang the axial end face of weight 4 when caulking section 41 is caulked to rotary shaft 2. This structure allows the motor in accordance with the third embodiment to hold the weight with the rotary shaft tightly and to be fit in a small space of a device.
(Fourth Exemplary Embodiment) A vibration motor in accordance with the fourth embodiment has one of the structures of the first through third embodiments, and an unbalance weight of the motor has the following structure: The weight of the vibration motor in accordance with the fourth embodiment is mainly made of metal having a high specific gravity such as tungsten and formed by a sintering method, so that the weight has numbers of holes, which are to be impregnated with oil. As a result, as shown in table 1, the weight obtains much better rust prevention than other unbalance weights having no rust-proof preparation.
TABLE 1
Figure imgf000006_0001
test condition: leave the samples in the atmosphere of 60° C, 90% RH the samples are made of tungsten 70%, copper 27% and nickel 3%. The exemplary embodiments discussed previously prove that the present invention can increase substantially the strength of holding the weight with the rotary shaft of the vibration motor comparing with that of conventional ones. The embodiments also prove that the present invention can eliminate the surface treatment for rust prevention such as plating. Further, the structure, where a step is formed on an axial end face of the weight, prevents the swelling section due to caulking from overhanging the axial end face of the weight. Therefore, when the vibration motor of the present invention is disposed in the space where a conventional motor was disposed, the unbalance weight can be extended axially longer than the conventional one. As a result, the mass of the weight can be increased, whereby greater vibrations can be produced.
The present invention thus can provide an inexpensive motor having several advantages as discussed above, which satisfy demands from the market.
Industrial Applicability
The vibration motor of the present invention is mounted to a radio paging-device or a cellular phone, and functions as a vibration source for informing a user of a calling or a message arrival by making the user sense the vibrations.

Claims

1. A vibration motor (1) comprising: an unbalance weight (4) mounted to a rotary shaft (2), said weight (4) including a rest section for receiving said rotary shaft (2) and a caulking section (41) for caulking said weight (4) to said rotary shaft (2); and said rotary shaft (2) including a recess (5) at a place corresponding to the rest section, wherein caulking strength applied to the caulking section (41) forces a part of said unbalance weight (4) to bite inside of the recess (5) for fixing said weight (4) to said rotary shaft (2).
2. The vibration motor (1) of claim 1, wherein the rest section is a groove (6) formed on said weight (4) in an axial direction.
3. The vibration motor (1) of claim 2, wherein the caulking section (41) is a bank which forms the groove (6).
4. The vibration motor (1) of claim 1, wherein the rest section is a hole (40) formed on said weight (4) in an axial direction.
5. The vibration motor (1) of claim 1, wherein a step (43) is formed on an axial end face of said weight (4).
6. The vibration motor (1) of claim 1, wherein said weight (4) is made of oil-impregnated sintered metal of which major component is metal having a high specific gravity.
7. The vibration motor (1) of claim 1, wherein said weight (4) has one of a fan-shaped sectional view and a semicircular sectional view.
PCT/JP2002/000640 2001-02-06 2002-01-29 Vibration motor WO2002063746A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2001-029094 2001-02-06
JP2001029094A JP2001239212A (en) 2001-02-06 2001-02-06 Vibration generating motor

Publications (1)

Publication Number Publication Date
WO2002063746A1 true WO2002063746A1 (en) 2002-08-15

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JP (1) JP2001239212A (en)
WO (1) WO2002063746A1 (en)

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WO2006058474A1 (en) * 2004-11-30 2006-06-08 Hengdian Group Dmegc Joint-Stock Co., Ltd The vibration motor with an inner eccenter

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JPH10336949A (en) * 1997-05-28 1998-12-18 Copal Co Ltd Method for fixing vibrator of vibration generating motor
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Publication number Priority date Publication date Assignee Title
WO2006058474A1 (en) * 2004-11-30 2006-06-08 Hengdian Group Dmegc Joint-Stock Co., Ltd The vibration motor with an inner eccenter

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JP2001239212A (en) 2001-09-04

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