JP5070079B2 - Ultrasonic motor driven vehicle pointer instrument - Google Patents

Description

  The present invention relates to an ultrasonic motor-driven vehicular pointer instrument used for a vehicle traveling speed meter, an engine rotation diameter, and the like.

As examples of a vehicle pointer instrument using an ultrasonic motor as a drive source, those described in Patent Document 1 and Patent Document 2 are known. In these vehicle pointer instruments described in these patent documents, a stator portion such as a traveling wave type ultrasonic motor or a torsional connector type ultrasonic motor is fixed to a housing, and the rotor portion is rotated by vibration of the stator portion. It is a concatenation of guidelines.
Japanese Patent Laid-Open No. 63-30995 Japanese Patent Laid-Open No. 3-200072

  By the way, the pointer instrument for vehicles described in the above-mentioned patent document has a problem that the height in the direction of the pointer shaft and the dimension in the direction perpendicular thereto are large and lacks in compactness.

  In view of the above circumstances, an object of the present invention is to provide an ultrasonic motor-driven vehicular pointer instrument that can be made compact by reducing the height in the direction of the pointer axis and the dimension perpendicular thereto. And

  According to the first aspect of the present invention, a vibrating body that is a stator portion of an ultrasonic motor is fixed to a housing, resonance vibration is caused in the vibration body, and the rotor is rotated by transmitting the resonance vibration to the rotor. In the ultrasonic motor-driven vehicular pointer instrument that rotates the pointer connected to the distal end side of the rotor, the vibrating body projects into the annular main body and the inner peripheral side of the annular main body via a spring portion. A plurality of provided vibrators and piezoelectric elements provided in the vibrators, the base end side of the rotor is inserted into the vibrator, and the vibrator contacts the outer periphery of the rotor. It is characterized by.

  According to a second aspect of the present invention, there is provided the ultrasonic motor-driven vehicular pointer instrument according to the first aspect, wherein the housing includes an upper case and a lower case that accommodate and fix the vibrating body by being united with each other. The upper case and the lower case are provided with a through-hole through which the base end side of the rotor inserted into the vibrating body passes, and when the base end of the rotor exits the through-hole of the lower case, the retaining case is provided. It is characterized by being retained by means.

  According to a third aspect of the present invention, a vibrating body, which is a stator portion of an ultrasonic motor, is fixed to a housing, a resonant vibration is caused in the vibrating body, and the rotor is rotated by transmitting the resonant vibration to the rotor. In the ultrasonic motor-driven vehicular pointer instrument that rotates the pointer connected to the front end side of the rotor, the vibrating body protrudes through an annular main body and a spring portion on the outer peripheral side of the annular main body A plurality of vibrators, and piezoelectric elements provided in each vibrator, the rotor is configured as a ring-shaped, the ring-shaped rotor is fitted on the outer peripheral side of the vibrator, The vibrator is in contact with the inner periphery of the rotor.

  According to a fourth aspect of the present invention, there is provided the ultrasonic motor-driven vehicular pointer instrument according to the third aspect, wherein the housing is configured as a holder having a central through hole and fixing the vibrating body. The shaft portion of the shaft portion is rotatably inserted into the center through hole of the holder, and the base end of the shaft portion is prevented from being detached by the retaining means when passing through the center through hole of the holder. .

  According to the first aspect of the present invention, since the base end side of the rotor is inserted into the annular vibrating body, the height dimension in the pointer shaft direction can be reduced. In addition, since the vibrating body is composed of an annular main body, a plurality of vibrators projecting from the inner periphery of the vibrator via a spring portion, and piezoelectric elements provided on the vibrators, While achieving compactness in the direction orthogonal to the axial direction, strong resonance vibration can be caused and efficiency can be improved.

  According to the second aspect of the present invention, the axial position of the rotor can be determined by retaining the base end of the rotor to the lower case by the retaining means, so that the assembly is easy.

  According to the invention of claim 3, since the ring-shaped rotor is fitted on the outer periphery of the annular vibrating body, the height dimension in the pointer shaft direction can be reduced. In addition, since the vibrating body is composed of an annular main body, a plurality of vibrators projecting from the outer periphery of the vibrator via a spring portion, and a piezoelectric element provided in each vibrator, the pointer shaft While achieving compactness in the direction orthogonal to the direction, strong resonance vibration can be caused and efficiency can be improved.

  According to the fourth aspect of the present invention, the positional relationship between the rotor connected to the pointer and the vibrating body can be determined by preventing the shaft portion of the pointer from being removed from the holder by the retaining means, so that the assembly is simple. .

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

<First Embodiment>
FIG. 1 is an exploded perspective view of the main part of the ultrasonic motor-driven vehicular pointer instrument according to the first embodiment, FIG. 2 is an exploded perspective view showing the details, and FIG. FIG. 4 is a cross-sectional view showing the main part cut at the position of the vibrator, and FIG. 5 is a vertical cross-sectional view of the main part.

  As shown in FIG. 5, the vehicle pointer instrument is provided integrally with a back case 1, a wiring board 2 disposed on the back surface of the back case 1, and a dial 3 disposed on the surface of the back case 1. A pointer 4 made of a light guide material that rotates in a plane parallel to the dial 3 around the pointer shaft portion 5 formed, a pointer cap 6 that covers a bent portion from the pointer shaft portion 5 to the pointer 4, and a pointer shaft The LED 7 that is mounted on the wiring board 2 so as to face the base end face of the portion 5 and illuminates the pointer 4 through the pointer shaft portion 5, the vibrating body 10 that is a stator portion of the ultrasonic motor, and the vibrating body 10 are housed and fixed. And a pipe-shaped rotor 15 with the pointer shaft portion 5 press-fitted therein.

  In this pointer instrument for a vehicle, resonance vibration is caused in the vibrating body 10, the resonance vibration is transmitted to the rotor 15, the rotor 15 is rotated, and thereby the pointer 4 connected to the tip side of the rotor 15 is provided. turn. Therefore, as shown in FIG. 3, the vibrating body 10 includes an annular main body 11, a plurality of vibrators 13 projecting from the inner peripheral side of the annular main body 11 via a spring portion 12, and the respective vibrations. And a piezo element 14 provided in the child 13. As shown in FIGS. 4 and 5, the base end side of the rotor 15 is inserted into the vibrating body 10, and the vibrator 13 is in pressure contact with the outer periphery of the rotor 15.

  As shown in FIGS. 2 and 5, the housing 20 includes an upper case 21 and a lower case 22 that house and fix the vibrating body 10 by being combined with each other. A mounting hole 11 a (see FIG. 3) formed in the annular main body 11 is fitted into a support protrusion 23 projecting from the upper surface of the lower case 22, thereby fixing the lower case 22.

  The upper case 21 and the lower case 22 are provided with through holes 27 and 26 through which the base end side of the rotor 15 inserted into the vibrating body 10 passes, and the base end of the rotor 15 is When passing through the through hole 26, the retaining ring (prevention means) 16 is fitted in the annular groove 15 a on the outer periphery of the base end of the rotor 15 to prevent the rotor 15 from coming off upward.

  The lower case 22 has a disc-like shape, and the upper case 21 that covers the lower case 22 includes a flange-shaped portion 24 that covers the upper side of the lower case 22, and a conical cylindrical portion 25 that protrudes above the center portion. As shown in FIG. 1, the conical cylindrical portion 25 is fitted in the center hole 3 a of the dial 3. A through hole 27 is opened at the center of the conical cylindrical portion 25, and the rotor 15 passes through the through hole 27. Further, as shown in FIG. 5, an outer flange 15a is attached to the tip of the rotor 15, and when the outer flange 15a hits the upper end of the conical cylindrical portion 25 of the upper case 21, the rotor 15 faces downward. Is positioned.

  In the pointer instrument for a vehicle having the above-described configuration, since the proximal end side of the rotor 15 is inserted into the annular vibrating body 10, the height dimension in the pointer shaft direction can be reduced. The vibrating body 10 includes an annular main body 11, a plurality of vibrators 13 projecting from the inner periphery of the vibrator body 10 via a spring portion 12, and piezoelectric elements 14 provided on the vibrators 13. Therefore, while achieving compactness in the direction perpendicular to the direction of the pointer shaft, strong resonance vibration can be caused and efficiency can be improved. Further, since the base end of the rotor 15 is prevented from coming off from the lower case 22 by the retaining ring 16, the axial position of the rotor 15 can be easily determined, and assembly can be facilitated.

Second Embodiment
FIG. 6 is an exploded perspective view of an essential part of the ultrasonic motor-driven vehicular pointer instrument according to the second embodiment, FIG. 7 is an exploded perspective view showing further details, and FIG. 9 is a perspective view showing the configuration, FIG. 9 is a cross-sectional view showing the main part cut at the position of the vibrator, and FIG. 10 is a vertical cross-sectional view of the main part.

  As shown in FIG. 10, the vehicle pointer instrument is provided integrally with a back case 1, a wiring board 2 disposed on the back surface of the back case 1, and a dial 3 disposed on the surface of the back case 1. A pointer 4 made of a light guide material that rotates in a plane parallel to the dial 3 around the pointer shaft portion 5 formed, a pointer cap 6 that covers a bent portion from the pointer shaft portion 5 to the pointer 4, and a pointer shaft An LED 7 that is mounted on the wiring board 2 so as to face the base end face of the portion 5 and illuminates the pointer 4 via the pointer shaft portion 5, the vibrating body 30 that is a stator portion of the ultrasonic motor, and the vibrating body 30 are accommodated. A vibrating body holder (housing) 40 to be fixed and a ring-shaped rotor 35 press-fitted into the inner periphery of the bottom of the cap 6 are provided.

  In this vehicle pointer instrument, resonance vibration is caused in the vibrating body 30 and the resonance vibration is transmitted to the rotor 35 to rotate the rotor 35, thereby being integrally connected via the rotor 35 and the cap 6. Turn pointer 4 Therefore, as shown in FIG. 8, the vibrating body 30 includes an annular main body 31, a plurality of vibrators 33 projecting from the outer peripheral side of the annular main body 31 via spring portions 32, and the vibrators. And a piezo element 34 provided at 33. As shown in FIGS. 9 and 10, a ring-shaped rotor 35 is fitted on the outer periphery of the vibrating body 30, and the vibrator 33 is pressed against the inner periphery of the rotor 35.

  As shown in FIGS. 7 and 10, a central boss portion 42 projects from the center of the upper surface of the disc-shaped holder 40, and a central through hole 41 is formed at the center of the central boss portion 42. A support protrusion 43 is provided around the central boss portion 42, and the vibrating body 30 has an attachment hole formed in the annular main body 31 in the support protrusion 23 with the annular main body 31 fitted in the central boss portion 42. It is fixed on the holder 40 by fitting 31a (see FIG. 8). Further, on the upper surface of the holder 40, a fitting step portion 44 having a small step is provided concentrically with the central boss portion 42, and when this fitting step portion 44 is fitted into the center hole 3a of the dial 3, Positioned with the dial 3.

  Further, as shown in FIG. 10, the pointer shaft portion 5 is positioned downward by the stepped portion 5 b on the distal end side contacting the upper end of the central boss portion 42 of the holder 40, and the proximal end side is the center of the holder 40. When passing through the through-hole 41, the retaining ring (preventing means) 16 is fitted into the annular groove 35a on the outer periphery of the base end to prevent it from coming off upward.

  In the vehicular pointer instrument having the above-described configuration, the ring-shaped rotor 35 is fitted on the outer periphery of the annular vibrating body 30, so that the height dimension in the direction of the pointer shaft can be reduced. The vibrating body 30 includes an annular main body 31, a plurality of vibrators 33 projecting from the outer periphery of the vibrator 30 via spring portions 32, and piezoelectric elements 34 provided on the vibrators 33. As a result, strong resonance vibration can be generated and the efficiency can be improved while achieving compactness in the direction perpendicular to the direction of the pointer shaft. Further, since the pointer shaft portion 5 is secured to the holder 40 by the retaining ring 16, the positional relationship between the rotor 35 and the vibrating body 30 connected to the pointer 4 via the cap 6 can be easily determined. Easy assembly.

It is a disassembled perspective view of the principal part of the ultrasonic motor drive type pointer instrument for vehicles of a 1st embodiment of the present invention. It is a disassembled perspective view shown further finely. It is a perspective view which shows the structure of the vibrating body used for the pointer instrument. It is a cross-sectional view which cuts and shows the principal part at the position of a vibrating body. It is a longitudinal cross-sectional view of the principal part of the pointer instrument for the vehicles. It is a disassembled perspective view of the principal part of the ultrasonic motor drive type pointer instrument for vehicles of a 2nd embodiment of the present invention. It is a disassembled perspective view shown further finely. It is a perspective view which shows the structure of the vibrating body used for the pointer instrument. It is a cross-sectional view which cuts and shows the principal part at the position of a vibrating body. It is a longitudinal cross-sectional view of the principal part of the pointer instrument for the vehicles.

Explanation of symbols

DESCRIPTION OF SYMBOLS 4 Pointer 5 Pointer shaft part 10 Vibrating body 11 Annular main body 12 Spring part 13 Vibrator 14 Piezo element 15 Rotor 16 Retaining ring (retaining means)
DESCRIPTION OF SYMBOLS 20 Housing 21 Upper case 22 Lower case 26,27 Through-hole 30 Vibrating body 31 Annular main body 32 Spring part 33 Vibrator 34 Piezo element 35 Rotor 40 Holder 41 Center through-hole

Claims (4)

A vibrating body, which is a stator part of an ultrasonic motor, is fixed to the housing, and a resonant vibration is caused in the vibrating body, and the rotor is rotated by transmitting the resonant vibration to the rotor. In an ultrasonic motor-driven vehicular pointer instrument that rotates connected pointers,
The vibrator is composed of an annular main body, a plurality of vibrators protruding from the inner peripheral side of the annular main body via springs, and piezoelectric elements provided on the vibrators, An ultrasonic motor-driven vehicular pointer instrument, wherein a base end side of the rotor is inserted into a vibrating body, and the vibrator is in contact with an outer periphery of the rotor. An ultrasonic motor-driven vehicular pointer instrument according to claim 1,
The housing is composed of an upper case and a lower case for housing and fixing the vibrating body by being combined with each other, and a through hole through which the base end side of the rotor inserted into the vibrating body passes through the upper case and the lower case The ultrasonic motor-driven vehicular pointer instrument is characterized in that the base end of the rotor passes through the through hole of the lower case and is prevented from being detached by retaining means. A vibrating body, which is a stator part of an ultrasonic motor, is fixed to the housing, and a resonant vibration is caused in the vibrating body, and the rotor is rotated by transmitting the resonant vibration to the rotor. In an ultrasonic motor-driven vehicular pointer instrument that rotates connected pointers,
The vibrator is composed of an annular main body, a plurality of vibrators projecting from the outer peripheral side of the annular main body via springs, and piezoelectric elements provided on the vibrators, and the rotor The ring-shaped rotor is fitted on the outer peripheral side of the vibrating body, and the vibrator is in contact with the inner periphery of the rotor. Guide instrument for vehicles. An ultrasonic motor-driven vehicular pointer instrument according to claim 3,
The housing is configured as a holder having a center through-hole and fixing the vibrating body, a shaft portion of the pointer is rotatably inserted into a center through-hole of the holder, and a base end of the shaft portion is the holder An ultrasonic motor-driven vehicular pointer instrument characterized in that it is prevented from coming off by means of retaining means when passing through the central through hole.

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