CN102843064A - Flexible replaceable screw thread pair driving ultrasonic motor - Google Patents
Flexible replaceable screw thread pair driving ultrasonic motor Download PDFInfo
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- CN102843064A CN102843064A CN2012103711580A CN201210371158A CN102843064A CN 102843064 A CN102843064 A CN 102843064A CN 2012103711580 A CN2012103711580 A CN 2012103711580A CN 201210371158 A CN201210371158 A CN 201210371158A CN 102843064 A CN102843064 A CN 102843064A
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Abstract
The invention relates to a flexible replaceable screw thread pair driving ultrasonic motor, belonging to the field of ultrasonic vibration application. The performance of the ultrasonic motor is not limited by the material of a screw thread pair and the dimensional parameter of a screw thread structure, the travel error of screw thread pair transmission is eliminated, and the output performance, the application flexibility and the positioning accuracy of the motor are improved. The flexible replaceable screw thread pair driving ultrasonic motor mainly comprises screw thread output shafts, a replaceable screw thread pair driving element and an ultrasonic exciting vibrator. Vibration exciting elements are fixedly bonded on at least four flat side faces or in grooves on the peripheral side faces of a vibrator to be excited. The replaceable screw thread pair driving element is of an integral type or a segmental type and is installed and fixedly bonded in paired installation center holes in a matching manner, and the screw thread output shafts are in thread connection with the replaceable screw thread pair driving element and are paired to output rotary and linear movements. With the flexible replaceable screw thread pair driving ultrasonic motor, the performance output flexibility and the flexible application diversity of this kind of ultrasonic motors are increased, the output characteristic of the motor is improved, and the flexible replaceable screw thread pair driving ultrasonic motor can be applied to the fields of aerospace, automobile industry, medical apparatuses and instruments, optical driving and precision positioning systems and the like.
Description
Technical field
The invention belongs to the ultrasonic vibration application, be specifically related to a kind of flexible replaceable screw thread pair of ultrasonic vibration excitation that utilizes and drive ultrasound electric machine.
Background technology
Utilize the screw thread pair of column stator flexural vibration mode to drive ultrasound electric machine based on the ultrasound-driven principle mainly through exciting at least two flexural vibration modes on the stator space; Utilize the inner surface of stator screw thread pair that is coupling in of vibration to produce driving row ripple, realize the rotation-rectilinear motion output of threaded rod output shaft.Such screw thread pair drive ultrasound electric machine have simple in structure, power output/quality is bigger than density, be easy to microminiaturization, positioning accuracy than characteristics such as height.
At present; Drive ultrasound electric machine based on screw thread pair several kinds of typical structures are arranged: stator is the screw thread driven polyhedron ultrasonic motor (is CN1767347A, CN1964175A and CN101364775A like the patent No.) that utilizes in-plane bending vibration modal coupling driving row ripple of polyhedral structure, the screw drive type ultrasound electric machine (patent No. is CN101056073B) that utilizes ring-type superthin structure stator in-plane bending vibration mode standing wave to drive; In order to reduce the resonance operating frequency of motor stator; The screw linear motor (patent No. is CN200910080339.6) that piezoelectricity complex bend beam that a end that a kind of stator adopts cantilever beam structure props up admittedly drives has been proposed; Such motor mainly is to utilize the coupling of the orthogonal space flexural vibration mode of column cantilever beam structure stator to produce driving row ripple, realizes the motion output of output shaft; Another kind has the screw drive type column rotation-linear ultrasonic motor of the meaning represented to mainly contain the ultrasound waveguide screw motor (like the patent No. is the patent of US2006049720-A1, US2005258714-A1, US7170214-B2, US7309943-B2, CN101040395A, CN1879232A) of stator for two types of the metal pipe type of pasting piezoelectric patches and piezoelectricity tubular types; This ultrasound waveguide screw motor mainly is to utilize two first-order bending vibrations of quadrature on the cylindrical stator space that two ends freely retrain to intercouple; Produce driving row ripple at the free-ended inner surface of stator; Stator and output shaft are realized the rotation-rectilinear motion output of output shaft through the screw thread pair transmission under the effect of axial load power; The mentioned used piezoelectric element of screw drive type ultrasound electric machine stator in front adopts more
d 31There is certain advantage in vibration mode at the microminiaturized manufacture view of motor, and particularly for the ultrasound waveguide screw motor, this advantage embodies more obviously, but inevitably has the less practical problem of power output.In order to improve the power output of motor, improve load characteristic, occur one type and utilized piezoelectric element
d 33The piezoelectric patches sandwich rotation linear ultrasonic motor (is CN200710304683.X and CN201110304078.9 like the patent No.) of vibration mode and the piezoelectricity thread transmission linear ultrasonic motor (patent No. is CN201110120487.3) that utilizes the MODAL TRANSFORMATION OF A type.
Drive the ultrasound electric machine execution mode from the screw thread pair of existing open invention; Screw drive part on the stator is processed as an integral body with stator; The single matching forms of screw thread pairs that adopt are connected transmission more between stator and screw thread output shaft; The mechanical output performance that shows as motor is single, lack flexibility, can't satisfy growing motor application occasion variation with demand; In addition; Because screw thread pair drives ultrasound electric machine and mainly adopts the screw thread pair type of belt drive; So the pairing material that motion thread is secondary, version and dimensional parameters are to the output performance of motor, like power output/square; Output speed, the axial runout when power output, delivery efficiency and motor move, positioning accuracy etc. have influence largely.
Summary of the invention
The purpose of this invention is to provide the replaceable screw thread pair of a kind of flexibility and drive ultrasound electric machine; The performance that this ultrasound electric machine can make the screw thread pair of flexural vibration mode drive ultrasound electric machine does not receive the restriction of screw thread pair material and helicitic texture dimensional parameters; Eliminate the journey error of screw thread pair transmission, improved output performance, application flexibility and the positioning accuracy of motor.
Ultrasound electric machine mainly comprises the ultrasonic vibrator that utilizes the piezoelectric excitation vibration, can change screw thread pair driving element and screw thread output shaft.The exciting element is cemented in by at least four flat sides on all sides of exciting or the groove.Can change the screw thread pair driving element is integral type or segmented, and coupling is installed and is cemented in the mounting center hole of pairing, and the screw thread output shaft is threaded with changing the screw thread pair driving element, pairing output rotation and rectilinear motion.
Realize above-mentioned purpose, concrete technical scheme of the present invention is following:
Flexible replaceable screw thread pair drives ultrasound electric machine; Described ultrasound electric machine mainly comprises the screw thread output shaft, can change screw thread pair driving element and ultrasonic action oscillator, and the profile that can change the screw thread pair driving element is cylindrical, and the ultrasonic action oscillator is by being formed by excitor and at least four exciting elements; At least be uniformly distributed with flat side or the groove that is processed with four symmetrical configuration quadrate orientation on all sides of excitor; The exciting element is identical with the quantity of flat side or groove, a fixed exciting element on each flat side or in the groove, the outer surface of exciting element be lower than or flush in groove place by the side of excitor; Be processed with cylindrical center bore by the center of excitor along its length direction perforation; Can change the screw thread pair driving element and embed in the cylindrical center bore, and the two interference fit, the center that can change the screw thread pair driving element connects along its length direction and is processed with screwed hole; The screw thread output shaft is complementary with the screwed hole that can change the screw thread pair driving element, pairing output rotation and rectilinear motion.
Flexible replaceable screw thread pair drives ultrasound electric machine; Described ultrasound electric machine comprises that screw thread output shaft, ultrasonic action oscillator and two can change the screw thread pair driving element, and the profile that can change the screw thread pair driving element is cylindrical, and the ultrasonic action oscillator is by being formed by excitor and at least four exciting elements; At least be uniformly distributed with flat side or the groove that is processed with four symmetrical configuration quadrate orientation on all sides of excitor; The exciting element is identical with the quantity of flat side or groove, a fixed exciting element on each flat side or in the groove, the outer surface of exciting element be lower than or flush in groove place by the side of excitor; The cylindrical installing hole that the same size symmetrical structure is arranged by excitor both ends of the surface center along its length; Two installing holes of a connecting hole coaxial communication, the aperture of connecting hole is less than the aperture of installing hole, and installing hole and connecting hole are cylindrical hole; Each installing hole is embedded in one can change the screw thread pair driving element; Can change screw thread pair driving element and installing hole interference fit, each center that can change the screw thread pair driving element is provided with the screwed hole of perforation, two the coaxial settings of screwed hole that can change the screw thread pair driving element along its length direction; Screw thread output shaft and two screwed holes that can change the screw thread pair driving element are complementary, pairing output rotation and rectilinear motion.
Flexible replaceable screw thread pair drives ultrasound electric machine, and described ultrasound electric machine comprises that screw thread output shaft, ultrasonic action oscillator and two can change the screw thread pair driving element, and the profile that can change the screw thread pair driving element for having cone angle does
θTruncated cone-shaped; The ultrasonic action oscillator is by being formed by excitor and at least four exciting elements; At least be uniformly distributed with flat side or the groove that is processed with four symmetrical configuration quadrate orientation on all sides of excitor; The exciting element is identical with the quantity of flat side or groove, a fixed exciting element on each flat side or in the groove, the outer surface of exciting element be lower than or flush in groove place by the side of excitor; By installing hole of the center of excitor both ends of the surface processing, there is the cone angle that has of same size symmetrical structure to do along its length by excitor both ends of the surface center
θThe truncated cone-shaped installing hole; Two truncated cone-shaped installing holes of a connecting hole coaxial communication; Truncated cone-shaped installing hole and the profile that can change the screw thread pair driving element connecting hole that is complementary is a cylindrical hole, and the aperture of connecting hole is less than the small end aperture in truncated cone-shaped hole, and each installing hole is embedded in one can change the screw thread pair driving element; Can change the screw thread pair driving element and connect installation by excitor cone angle self-locking pairing; The center that can change the screw thread pair driving element is provided with the screwed hole of perforation along its length direction, two the coaxial settings of screwed hole that can change the screw thread pair driving element, and screw thread output shaft and two screwed holes that can change the screw thread pair driving element are complementary; The screw thread output shaft can change the screw thread pair driving element and is threaded with two, pairing output rotation and rectilinear motion.
The present invention with respect to the beneficial effect of prior art is:
The compact conformation of the changed screw thread pair driven in rotation-linear electric motors that utilize the ultrasonic vibrator excitation that the present invention proposes; Screw thread pair can change; The screw thread pair material does not receive the restriction of ultrasonic vibrator, and vibrator material and the pairing of screw thread pair material are versatile and flexible, and output performance improves significantly.The big I of diameter, pitch, lead angle that can change screw thread pair driving element screwed hole of centre and screw thread output shaft realizes the flexible output of ultrasound electric machine performance according to the flexible displacement of the required output performance demand pairing of motor.The segmented flexibility can be changed axial runout and the motor range error that screw thread pair reduces motor, has improved stability, the reliability of motor performance and has enriched functional diversity.
The present invention significantly improves such screw thread pair and drives the flexible and applying flexible diversity of ultrasound electric machine performance output, improves the output characteristic of motor, promotes the screw thread pair of flexural vibration mode excitation to drive the practicalization of ultrasound electric machine.The present invention has wide application prospect in fields such as Aero-Space, auto industry, medicine equipment, optical drive and Precision Position Location Systems.
Description of drawings
Fig. 1 illustrates the replaceable screw thread pair of a kind of flexibility and drives ultrasound electric machine master cutaway view;
Fig. 2 illustrates A-A sectional view among Fig. 1, and P is the polarised direction of piezoelectric crystal material among the figure;
Fig. 3 illustrates the replaceable screw thread pair sketch map of motor described in Fig. 1;
Fig. 4 illustrates the left view of Fig. 3;
Fig. 5 illustrates the replaceable screw thread pair sketch map of a kind of flexibility that is different from Fig. 3 (screw thread output diameter of axle size flexibility can be changed);
Fig. 6 illustrates the left view of Fig. 5;
Fig. 7 illustrates the compact ultrasonic vibrator master cutaway view that the replaceable screw thread pair of a kind of flexibility drives ultrasound electric machine;
Fig. 8 illustrates the B-B cutaway view of Fig. 7, and P is the polarised direction of piezoelectric crystal material among the figure;
Fig. 9 illustrates the replaceable screw thread pair of the two segmentations of a kind of flexibility and drives ultrasound electric machine master's cutaway view (adopt two and can change the screw thread pair driving element);
Figure 10 illustrates the C-C cutaway view of Fig. 9, and P is the polarised direction of piezoelectric crystal material among the figure;
Figure 11 illustrates the replaceable screw thread pair sketch map of two segmentations (adopting two cylindrical screw thread pair driving elements that change) of motor described in Fig. 9;
Figure 12 illustrates the left view of Figure 11;
Figure 13 illustrates the flexible two replaceable screw thread pair sketch mapes of segmentation (adopting two cylindrical screw thread pair driving elements that change) that are different from Figure 11;
Figure 14 illustrates the left view of Figure 13;
Figure 15 illustrates the compact ultrasonic vibrator sketch map (adopt two and can change the screw thread pair driving element) that the replaceable screw thread pair of the two segmentations of a kind of flexibility drives ultrasound electric machine;
Figure 16 illustrates the D-D cutaway view of Figure 15, and P is the polarised direction of piezoelectric crystal material among the figure;
Figure 17 illustrates the replaceable screw thread pair of the two segmentation truncated cone-shaped of a kind of flexibility and drives ultrasound electric machine master cutaway view;
Figure 18 illustrates the compact ultrasonic vibrator master cutaway view that the replaceable screw thread pair of flexible two segmentation truncated cone-shaped drives ultrasound electric machine;
Flexible two segmentation truncated cone-shaped that Figure 19 illustrates motor described in Figure 17 drive replaceable screw thread pair master cutaway view;
Figure 20 illustrates the left view of Figure 19.
Among the figure: screw thread output shaft 1, can change screw thread pair driving element 2, ultrasonic action oscillator 3, by excitor 31, exciting element 32.
Embodiment
Embodiment one:Referring to Fig. 1 to Fig. 8; Flexible replaceable screw thread pair drives ultrasound electric machine; Described ultrasound electric machine comprises screw thread output shaft 1, can change screw thread pair driving element 2 and ultrasonic action oscillator 3; The profile that can change screw thread pair driving element 2 is cylindrical, and ultrasonic action oscillator 3 is by formed by excitor 31 and four exciting elements 32 at least, is uniformly distributed with the flat side that is processed with four symmetrical configuration quadrate orientation or groove on all sides of excitor 31 at least (like Fig. 2 and Fig. 8; The groove structure form makes ultrasonic action oscillator 3 structures compact more; Exciting element 32 is identical with the quantity of flat side or groove, a fixed exciting element 32 (fixed) on each flat side or in the groove, the outer surface that is cemented in the exciting element 32 in the groove through cold welding or epoxide-resin glue be lower than or flush in the groove place by the side of excitor 31; Be processed with cylindrical center bore by the center of excitor 31 along its length direction perforation; Can change screw thread pair driving element 2 and embed in the cylindrical center bore, and the two interference fit, the center that can change screw thread pair driving element 2 connects along its length direction and is processed with screwed hole; Screw thread output shaft 1 is complementary with the screwed hole that can change screw thread pair driving element 2, pairing output rotation and rectilinear motion.
This embodiment provides utilizes the flexible replaceable screw thread pair of flexural vibration mode to drive ultrasound electric machine, by the material thermal expansion coefficient of excitor 31 smaller or equal to changing screw thread pair driving element 2 material thermal expansion coefficients; The exciting mode of ultrasonic action oscillator 3 can be selected the single order vibration for use according to exciting element 32 corresponding mounting arrangements modes, the mode of oscillation of set of flex such as second order vibration vibration, and corresponding adjusting motor running frequency is implemented exciting.
Like Fig. 3 and Fig. 5; The big I of diameter, pitch, lead angle that can change screw thread pair driving element 2 screwed hole of centre and screw thread output shaft 1 is according to the flexible displacement of the required output performance demand pairing of motor; Output thread spindle 1 with can change screw thread pair driving element 2 and process by high-abrasive material; Output thread spindle 1 with can change the screw thread pair that screw thread pair driving element 2 is complementary and be coated with the anti-friction wear-resistant coating, coating material be type brill carbon coating, Nano diamond, Al
2O
3Or AlN.
Can change screw thread pair driving element 2 and passed through heat ultrasonic vibrator 3 by excitor 31 fastening connection mounted in pairing mode modes; Sub-cooled can be changed screw thread pair driving element 2; Can change screw thread pair driving element 2 embeds by in the cylindrical center bore of excitor 31; And screw thread output shaft 1 through flexibility displacement pairing of the two interference fit, the motor of this execution mode, can change screw thread pair driving element 2 and ultrasonic action oscillator 3, improve the output performance and the purpose that reaches motor performance flexibility design of motor.
By excitor 31 is steel alloy, copper alloy, aluminium alloy, titanium alloy metal material or composite material; The piezoelectric crystal material of exciting element 32 for having piezoelectric effect; Like PZT4, PZT-5, PZT-8 or PMNT, screw thread output shaft 1 is elected copper alloy, steel alloy metalloid or polytetrafluoroethylene class high polymer material as.
It is example describes that the exciting mode that (utilizing flexural vibration mode) flexible replaceable screw thread pair of this embodiment drives ultrasound electric machine adopts the second order flexural vibration modes with ultrasonic action oscillator 3, can similarly know for exciting mode this area worker of the flexural vibration mode of other order.Used exciting element 32 adopts
d 31Vibration mode, the type piezoelectric patches polarizes along thickness direction, and P is the polarised direction of piezoelectric crystal material, and upper and lower surfaces is coated with thin energising galactic pole, and strain deformation direction and polarised direction are perpendicular during the energising excitation.Used exciting element 32 is divided into two exciting groups, wherein one group 4 difference 32a, 32b, 32c and 32d; Wherein 32a and 32c lead to sin (ω t), and 32b and 32d lead to sin (ω t+ φ); The then logical reverse energization alternating current of another group; By excitor 31 ground connection; Wherein the frequencies omega of this ac signal generally should match with this stator second order resonance of flexural vibration frequency or be close; Reach the effect that excites the mutually orthogonal second order flexural vibration mode of stator space thus; Phase difference is generally 90 or 270 degree, but the rotation of both forward and reverse directions-rectilinear motion output.
In this execution mode, by the material thermal expansion coefficient of excitor 31 smaller or equal to changing screw thread pair driving element 2 material thermal expansion coefficients.Like this, when motor in when operation, along with the rising of temperature, ultrasonic vibrator makes and cooperates more fasteningly between them with changing heat expansion between the screw thread pair driving element, effectively guarantees the reliability service more of motor.
Embodiment two:Referring to Fig. 9 to Figure 16; Flexible replaceable screw thread pair drives ultrasound electric machine, and described ultrasound electric machine comprises that screw thread output shaft 1, ultrasonic action oscillator 3 and two can change screw thread pair driving element 2, and the profile that can change screw thread pair driving element 2 is cylindrical; Ultrasonic action oscillator 3 is by being formed by excitor 31 and at least four exciting elements 32; At least be uniformly distributed with the flat side or the groove (like Figure 10 and Figure 16, groove structure makes ultrasonic action oscillator 3 structures compactness more) that are processed with four symmetrical configuration quadrate orientation on all sides of excitor 31, exciting element 32 is identical with the quantity of flat side or groove; On each flat side or groove in a fixed exciting element 32 (fixed) through cold welding or epoxide-resin glue; The outer surface that is cemented in the exciting element 32 in the groove be lower than or flush in the groove place by the side of excitor 31, by excitor 31 both ends of the surface centers the cylindrical installing hole of same size symmetrical structure, two installing holes of a connecting hole coaxial communication are arranged along its length; The aperture of connecting hole is less than the aperture of installing hole; Installing hole and connecting hole are cylindrical hole, and each installing hole is embedded in one can change screw thread pair driving element 2, can change screw thread pair driving element 2 and installing hole interference fit; Each center that can change screw thread pair driving element 2 is provided with the screwed hole of perforation along its length direction; Two the coaxial settings of screwed hole that can change screw thread pair driving element 2, screw thread output shaft 1 and two screwed holes that can change screw thread pair driving element 2 are complementary, pairing output rotation and rectilinear motion.
This embodiment provides utilizes the flexible replaceable screw thread pair of flexural vibration mode to drive ultrasound electric machine, by the material thermal expansion coefficient of excitor 31 smaller or equal to changing screw thread pair driving element 2 material thermal expansion coefficients; The exciting mode of ultrasonic action oscillator 3 can be selected the single order vibration for use according to exciting element 32 corresponding mounting arrangements modes, the mode of oscillation of set of flex such as second order vibration vibration, and corresponding adjusting motor running frequency is implemented exciting.
Like Figure 11 and Figure 13; The big I of diameter, pitch, lead angle of two screwed holes that can change screw thread pair driving element 2 and screw thread output shaft 1 is according to the flexible displacement of the required output performance demand pairing of motor; Output thread spindle 1 with can change screw thread pair driving element 2 and process by high-abrasive material; Output thread spindle 1 with can change the screw thread pair that screw thread pair driving element 2 is complementary and be coated with the anti-friction wear-resistant coating, coating material be type brill carbon coating, Nano diamond, Al
2O
3Or AlN.
Can change screw thread pair driving element 2 and passed through heat ultrasonic vibrator 3 by excitor 31 interference fit mounted in pairing mode modes, sub-cooled can be changed screw thread pair driving element 2.
The screw thread output shaft 1 of the motor of this execution mode through flexibility displacement pairing, can change screw thread pair driving element 2 and ultrasonic action oscillator 3, improve the output performance and the purpose that reaches motor performance flexibility design of motor.
By excitor 31 is 31 to be steel alloy, copper alloy, aluminium alloy, titanium alloy metal material or composite material; The piezoelectric crystal material of exciting element 32 for having piezoelectric effect; Like PZT4, PZT-5, PZT-8 or PMNT, screw thread output shaft 1 is elected copper alloy, steel alloy metalloid or polytetrafluoroethylene class high polymer material as.
It is example describes that the exciting mode that (utilizing flexural vibration mode) flexible replaceable screw thread pair of this embodiment drives ultrasound electric machine adopts the second order flexural vibration modes with ultrasonic action oscillator 3, can similarly know for exciting mode this area worker of the flexural vibration mode of other order.Used exciting element 32 adopts
d 31Vibration mode, the type piezoelectric patches polarizes along thickness direction, and P is the polarised direction of piezoelectric crystal material, and upper and lower surfaces is coated with thin energising galactic pole, and strain deformation direction and polarised direction are perpendicular during the energising excitation.Used exciting element 32 is divided into two exciting groups, wherein one group 4 difference 32a, 32b, 32c and 32d; Wherein 32a and 32c lead to sin (ω t), and 32b and 32d lead to sin (ω t+ φ); The then logical reverse energization alternating current of another group; By excitor 31 ground connection; Wherein the frequencies omega of this ac signal generally should match with this stator second order resonance of flexural vibration frequency or be close; Reach the effect that excites the mutually orthogonal second order flexural vibration mode of stator space thus; Phase difference is generally 90 or 270 degree, but the rotation of both forward and reverse directions-rectilinear motion output.
In this execution mode, by the material thermal expansion coefficient of excitor 31 smaller or equal to changing screw thread pair driving element 2 material thermal expansion coefficients.Like this, when motor in when operation, along with the rising of temperature, ultrasonic vibrator makes and cooperates more fasteningly between them with changing heat expansion between the screw thread pair driving element, effectively guarantees motor reliability service more.
Embodiment three:Referring to Figure 17 to Figure 20; Flexible replaceable screw thread pair drives ultrasound electric machine; Described ultrasound electric machine comprises that screw thread output shaft 1, ultrasonic action oscillator 3 and two can change screw thread pair driving element 2; The profile that can change screw thread pair driving element 2 is to have the truncated cone-shaped that cone angle is θ; Ultrasonic action oscillator 3 is by being formed by excitor 31 and at least four exciting elements 32; At least be uniformly distributed with flat side or the groove that is processed with four symmetrical configuration quadrate orientation on all sides of excitor 31, exciting element 32 is identical with the quantity of flat side or groove, on each flat side or groove in a fixed exciting element 32 (fixed) through cold welding or epoxide-resin glue; The outer surface that is cemented in the exciting element 32 in the groove be lower than or flush in the groove place by the side of excitor 31; By installing hole of the center of excitor 31 both ends of the surface processing, the truncated cone-shaped installing hole that cone angle is θ that has of same size symmetrical structure, two truncated cone-shaped installing holes of a connecting hole coaxial communication are arranged along its length by excitor 31 both ends of the surface centers; Truncated cone-shaped installing hole and the profile that can change screw thread pair driving element 2 connecting hole that is complementary is a cylindrical hole; The aperture of connecting hole is less than the small end aperture in truncated cone-shaped hole, and each installing hole is embedded in one can change screw thread pair driving element 2, can change screw thread pair driving element 2 and connect installation by excitor 31 cone angle self-lockings pairing; The center that can change screw thread pair driving element 2 is provided with the screwed hole of perforation along its length direction; Two the coaxial settings of screwed hole that can change screw thread pair driving element 2, screw thread output shaft 1 and two screwed holes that can change screw thread pair driving element 2 are complementary, and screw thread output shaft 1 can change screw thread pair driving element 2 be threaded (pairing output rotation and rectilinear motion) with two.
Shown in figure 18, in this embodiment, the taper angle theta of cone angle that truncated cone-shaped can be changed screw thread pair driving element 2 and coupling installing hole is all smaller or equal to 3 °.
This embodiment provides utilizes the flexible replaceable screw thread pair of flexural vibration mode to drive ultrasound electric machine, by the material thermal expansion coefficient of excitor 31 smaller or equal to changing screw thread pair driving element 2 material thermal expansion coefficients.Like this, when motor in when operation, along with the rising of temperature, ultrasonic vibrator makes and cooperates more fasteningly between them with changing heat expansion between the screw thread pair driving element, effectively guarantees motor reliability service more.The exciting mode of ultrasonic action oscillator 3 can be selected the single order vibration for use according to exciting element 32 corresponding mounting arrangements modes, the mode of oscillation of set of flex such as second order vibration vibration, and corresponding adjusting motor running frequency is implemented exciting.
The big I of diameter, pitch, lead angle of two screwed holes that can change screw thread pair driving element 2 and screw thread output shaft 1 is according to the flexible displacement of the required output performance demand pairing of motor; Output thread spindle 1 with can change screw thread pair driving element 2 and process by high-abrasive material; Output thread spindle 1 with can change the screw thread pair that screw thread pair driving element 2 is complementary and be coated with the anti-friction wear-resistant coating, coating material be type brill carbon coating, Nano diamond, Al
2O
3Or AlN.
Claims (10)
1. the replaceable screw thread pair of flexibility drives ultrasound electric machine; Described ultrasound electric machine mainly comprises screw thread output shaft (1), can change screw thread pair driving element (2) and ultrasonic action oscillator (3); It is characterized in that: the profile that can change screw thread pair driving element (2) is cylindrical; Ultrasonic action oscillator (3) is by being formed by excitor (31) and at least four exciting elements (32); At least be uniformly distributed with flat side or the groove that is processed with four symmetrical configuration quadrate orientation on all sides of excitor (31); Exciting element (32) is identical with the quantity of flat side or groove, a fixed exciting element (32) on each flat side or in the groove, the outer surface of exciting element (32) be lower than or flush in groove place by the side of excitor (31); Be processed with cylindrical center bore by the center of excitor (31) along its length direction perforation; Can change screw thread pair driving element (2) and embed in the cylindrical center bore, and the two interference fit, the center that can change screw thread pair driving element (2) connects along its length direction and is processed with screwed hole; Screw thread output shaft (1) is complementary with the screwed hole that can change screw thread pair driving element (2), pairing output rotation and rectilinear motion.
2. the replaceable screw thread pair of flexibility as claimed in claim 1 drives ultrasound electric machine; It is characterized in that: output thread spindle (1) and can change screw thread pair driving element (2) and process by high-abrasive material; Output thread spindle (1) with can change the screw thread pair that screw thread pair driving element (2) is complementary and be coated with the anti-friction wear-resistant coating, coating material type of being brill carbon coating, Nano diamond, Al2O3 or AlN.
3. the replaceable screw thread pair of flexibility according to claim 1 and 2 drives ultrasound electric machine, it is characterized in that: by the material thermal expansion coefficient of excitor (31) smaller or equal to changing screw thread pair driving element (2) material thermal expansion coefficient.
4. the replaceable screw thread pair of flexibility drives ultrasound electric machine; Described ultrasound electric machine comprises that screw thread output shaft (1), ultrasonic action oscillator (3) and two can change screw thread pair driving element (2); It is characterized in that: the profile that can change screw thread pair driving element (2) is cylindrical; Ultrasonic action oscillator (3) is uniformly distributed with flat side or the groove that is processed with four symmetrical configuration quadrate orientation at least by being formed by excitor (31) and at least four exciting elements (32) on all sides of excitor (31), exciting element (32) is identical with the quantity of flat side or groove; On each flat side or groove in a fixed exciting element (32); The outer surface of exciting element (32) be lower than or flush in groove place by the side of excitor (31), by excitor (31) both ends of the surface center the cylindrical installing hole of same size symmetrical structure, two installing holes of a connecting hole coaxial communication are arranged along its length; The aperture of connecting hole is less than the aperture of installing hole; Installing hole and connecting hole are cylindrical hole, and each installing hole is embedded in one can change screw thread pair driving element (2), can change screw thread pair driving element (2) and installing hole interference fit; Each center that can change screw thread pair driving element (2) is provided with the screwed hole of perforation along its length direction; Two the coaxial settings of screwed hole that can change screw thread pair driving element (2), screw thread output shaft (1) is complementary with two screwed holes that can change screw thread pair driving element (2), pairing output rotation and rectilinear motion.
5. the replaceable screw thread pair of flexibility as claimed in claim 4 drives ultrasound electric machine; It is characterized in that: output thread spindle (1) and can change screw thread pair driving element (2) and process by high-abrasive material; Output thread spindle (1) with can change the screw thread pair that screw thread pair driving element (2) is complementary and be coated with the anti-friction wear-resistant coating, coating material type of being brill carbon coating, Nano diamond, Al2O3 or AlN.
6. drive ultrasound electric machine according to the replaceable screw thread pair of claim 4 or 5 described flexibilities, it is characterized in that: by the material thermal expansion coefficient of excitor (31) smaller or equal to changing screw thread pair driving element (2) material thermal expansion coefficient.
7. the replaceable screw thread pair of flexibility drives ultrasound electric machine; Described ultrasound electric machine comprises that screw thread output shaft (1), ultrasonic action oscillator (3) and two can change screw thread pair driving element (2), and it is characterized in that: the profile that can change screw thread pair driving element (2) for having cone angle does
θTruncated cone-shaped; Ultrasonic action oscillator (3) is by being formed by excitor (31) and at least four exciting elements (32); At least be uniformly distributed with flat side or the groove that is processed with four symmetrical configuration quadrate orientation on all sides of excitor (31); Exciting element (32) is identical with the quantity of flat side or groove; On each flat side or groove in a fixed exciting element (32); The outer surface of exciting element (32) be lower than or flush in groove place by the side of excitor (31), by installing hole of the center of excitor (31) both ends of the surface processing, had the cone angle that has of same size symmetrical structure to do along its length by excitor (31) both ends of the surface center
θThe truncated cone-shaped installing hole; Two truncated cone-shaped installing holes of a connecting hole coaxial communication; Truncated cone-shaped installing hole and the profile that can change screw thread pair driving element (2) connecting hole that is complementary is a cylindrical hole; The aperture of connecting hole is less than the small end aperture in truncated cone-shaped hole, and each installing hole is embedded in one can change screw thread pair driving element (2), can change screw thread pair driving element (2) and connect installation by excitor (31) cone angle self-locking pairing; The center that can change screw thread pair driving element (2) is provided with the screwed hole of perforation along its length direction; Two the coaxial settings of screwed hole that can change screw thread pair driving element (2), screw thread output shaft (1) and two screwed holes that can change screw thread pair driving element (2) are complementary, and screw thread output shaft (1) can change screw thread pair driving element (2) and is threaded with two.
8. the replaceable screw thread pair of flexibility as claimed in claim 7 drives ultrasound electric machine; It is characterized in that: output thread spindle (1) and can change screw thread pair driving element (2) and process by high-abrasive material; Output thread spindle (1) with can change the screw thread pair that screw thread pair driving element (2) is complementary and be coated with the anti-friction wear-resistant coating, coating material type of being brill carbon coating, Nano diamond, Al2O3 or AlN.
9. the replaceable screw thread pair of flexibility as claimed in claim 7 drives ultrasound electric machine, it is characterized in that: the taper angle theta of changed screw thread pair driving element (2) with certain cone angle truncated cone-shaped is smaller or equal to 3 °.
10. drive ultrasound electric machine according to the replaceable screw thread pair of claim 7,8 or 9 described flexibilities, it is characterized in that: by the material thermal expansion coefficient of excitor (31) smaller or equal to changing screw thread pair driving element (2) material thermal expansion coefficient.
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Application publication date: 20121226 |