Linear ultrasonic motor vibrator module
By designing the accommodating groove and pre-tightening structure in a linear ultrasonic motor, the problem of bolt tightening causing damage to piezoelectric ceramics is solved, uniform compression and assembly of the ceramics are achieved, and product quality and production efficiency are improved.
Patent Information
- Application Number
- CN202323551808.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2023-12-25
- Publication Date
- 2024-12-13
- Estimated Expiration
- 2033-12-25
AI Technical Summary
When installing piezoelectric ceramics in existing linear ultrasonic motors, the bolts are prone to torque to the ceramics during the tightening process, resulting in damage to them, and it is difficult to assemble, affecting product yield and production efficiency.
A linear ultrasonic motor oscillator module is designed. By setting a storage groove on the drive arm to embed the piezoelectric ceramic group, and using pre-tightening structures such as bolts and pressing blocks, the bolts can be avoided from contacting the ceramic directly, so as to achieve uniform tightening of the ceramic and reduce assembly. Difficulty.
It effectively avoids damage and assembly complexity of piezoelectric ceramics, improves product yield and production efficiency, and ensures the strength and vibration efficiency of the ceramics.
Smart Images
Figure CN222169639U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of motors, and more specifically, to a linear ultrasonic motor vibrator module. Background Art
[0002] Ultrasonic motors are drivers that use mechanical vibrations in the ultrasonic frequency domain as a driving source. They use electrical energy to generate ultrasonic vibrations to obtain driving force, and convert power into the movement of the rotor or slider through friction coupling. Compared with traditional motors, ultrasonic motors have small inertia, fast response, good controllability, are not affected by magnetic fields, and do not generate magnetic fields themselves, and have high positioning accuracy. Ultrasonic motors also have the characteristics of light weight, simple structure, high efficiency, low noise, low speed and high torque, and can directly drive loads. Since the load is driven directly, the vibration noise, gap, low efficiency, and difficult control problems caused by the use of gear speed change are avoided. Therefore, ultrasonic motors are a new automatic control actuator and a new transmission mode. They are a breakthrough and a powerful supplement to the traditional electromagnetic drive principle.
[0003] The linear ultrasonic motor is a widely used ultrasonic motor. The linear ultrasonic motor uses the inverse piezoelectric effect of piezoelectric materials to excite its micro-vibration at the resonant frequency of the elastic metal matrix, and then transmits the micro-vibration to the mover through friction coupling, thereby causing the mover to move linearly. The advantages of the linear ultrasonic motor over the electromagnetic motor are: the linear ultrasonic motor does not require electromagnetic windings, so the structure is compact and easy to miniaturize; the vibrator module of the linear ultrasonic motor transfers kinetic energy to the mover through friction, so it has strong anti-electromagnetic interference ability and has power-off self-locking ability.
[0004] In order to fix the piezoelectric ceramics in the current linear ultrasonic motor, a through hole is usually set in the middle of the piezoelectric ceramics for bolts to pass through. However, during installation, if the piezoelectric ceramics are not well centered, the side wall of the through hole of the piezoelectric ceramics will contact the bolts, so that the bolts will generate torque on the piezoelectric ceramics during tightening, thereby damaging the piezoelectric ceramics. Therefore, it is urgent to design a new type of linear ultrasonic motor vibrator module to solve the above problems. Utility Model Content
[0005] The utility model aims to provide a linear ultrasonic motor vibrator module to solve the problem that piezoelectric ceramics are easily damaged.
[0006] The utility model provides a linear ultrasonic motor vibrator module, comprising: a vibrator, the vibrator is annular, and the outer annular surface of the vibrator has two connecting ends arranged oppositely; two driving arms, the two driving arms are respectively connected to the two connecting ends of the vibrator, and each of the driving arms is also provided with a receiving groove; a piezoelectric ceramic group is located in the receiving groove of the driving arm, and the piezoelectric ceramic group transmits vibration to the vibrator through the driving arm; a pre-tightening structure, at least partially located in the receiving groove of the driving arm, and the pre-tightening structure presses the piezoelectric ceramic group; wherein the piezoelectric ceramic group has two opposite surfaces, one side surface is tightly attached to the end face of the connecting end, and the other side surface is tightly attached to the end face of the pre-tightening structure, and the pre-tightening structure makes the piezoelectric ceramic group and the end face of the connecting end of the vibrator tightly attached.
[0007] Optionally, the driving feet of the vibrator are located on the outer side surfaces on two opposite sides where the connecting ends are not provided.
[0008] Optionally, the piezoelectric ceramics in the piezoelectric ceramic group have no perforations.
[0009] Optionally, the vibrator includes a first through hole, and the connecting end is further provided with a second through hole, the axis of the second through hole is parallel to the axis of the first through hole, and the center of the second through hole and the center of the first through hole are both located on the central axis of the vibrator.
[0010] Optionally, the driving arm and the vibrator are an integrated structure, or the driving arm and the vibrator are connected by a mortise and tenon structure, a first connecting structure is provided at one end of the driving arm close to the vibrator, and a second connecting structure corresponding to the first connecting structure is provided at the connecting end.
[0011] Optionally, a threaded hole connected to the receiving groove is provided at one end of the driving arm away from the vibrator, and the pre-tightening structure includes a bolt, which passes through the threaded hole to press the piezoelectric ceramic group in the receiving groove toward the end surface of the connecting end.
[0012] Optionally, when the driving arm and the vibrator are connected by a mortise and tenon structure, the driving arm includes a C-shape, the connecting end includes a T-shape, and at least a portion of the connecting end extends into the driving arm to achieve connection between the driving arm and the connecting end.
[0013] Optionally, the first connection structure includes a protrusion, and the second connection structure includes a groove corresponding to the protrusion.
[0014] Optionally, the vibrator comprises a first surface and a second surface opposite to each other, and a fixing structure for fixing the linear ultrasonic motor vibrator module is arranged on the first surface and the second surface of the vibrator.
[0015] Optionally, the fixing structure is located between the second through hole and an end surface of the connecting end, and the fixing structure includes a boss or a positioning hole.
[0016] Optionally, a cross section of the boss taken along a plane perpendicular to the first surface is in a convex shape.
[0017] Optionally, the positioning holes on the first surface and the second surface are connected.
[0018] Optionally, the pre-tightening structure further includes a pressing block, and the pressing block is at least located between the bolt and the piezoelectric ceramic group.
[0019] Optionally, the accommodating groove passes through two opposite side surfaces of the driving arm.
[0020] The above-mentioned linear ultrasonic motor vibrator module, the piezoelectric ceramic group includes a plurality of the piezoelectric ceramics and a plurality of the conductive sheets, the piezoelectric ceramics and the conductive sheets are alternately arranged, the number of the piezoelectric ceramics is 2n, the number of the conductive sheets is 2n+1, and 1≤n≤3, n is a positive integer, and the conductive sheets are located on the outside of the piezoelectric ceramic group.
[0021] Optionally, the material density of the vibrator is smaller than the material density of the driving arm.
[0022] The linear ultrasonic motor vibrator module provided by the utility model is provided with a receiving groove on the driving arm, the piezoelectric ceramic group is embedded in the receiving groove, and then the pre-tightening structure extends into the receiving groove to realize the compression of the piezoelectric ceramic group, thereby avoiding the perforation of the piezoelectric ceramic, ensuring the strength of the piezoelectric ceramic, avoiding the problem of opening holes in the piezoelectric ceramic and the damage and breakage of the piezoelectric ceramic during the tightening of the bolts due to insufficient concentricity, and also reducing the difficulty of assembly, improving the product yield and production efficiency. The pressure block located between the bolt and the piezoelectric ceramic group avoids direct contact between the bolt and the piezoelectric ceramic group, making the pre-tightening force distribution more uniform. The design of the receiving groove makes the assembly of the linear ultrasonic motor vibrator module more convenient and simple.
[0023] Furthermore, the driving arm and the vibrator can be designed as an integrated unit, which has a more compact structure and can effectively avoid wear and looseness between parts caused by vibration during use.
[0024] Furthermore, the driving arm and the vibrator can also be designed as a split type, so that the driving arm can be replaced, and a material different from that of the vibrator can be selected. Specifically, the material density of the vibrator is less than the material density of the driving arm. By selecting a heavier material for the driving arm, the vibration energy of the piezoelectric ceramic group can be effectively reduced from being lost from the outside of the driving arm, which significantly improves the vibration of the vibrator part, thereby improving the working efficiency of the linear ultrasonic motor vibrator module. BRIEF DESCRIPTION OF THE DRAWINGS
[0025] The above and other objects, features and advantages of the present invention will become more apparent through the following description of the embodiments of the present invention with reference to the accompanying drawings.
[0026] Figure 1 A schematic diagram of a linear ultrasonic motor vibrator module according to a first embodiment of the utility model is shown;
[0027] Figure 2 It shows a front view of a linear ultrasonic motor vibrator module according to a first embodiment of the utility model;
[0028] Figure 3 A cross-sectional schematic diagram of a linear ultrasonic motor vibrator module according to a first embodiment of the utility model is shown;
[0029] Figure 4 A schematic diagram of a piezoelectric ceramic group in a linear ultrasonic motor vibrator module of the first embodiment of the utility model is shown;
[0030] Figure 5 The right side view of the linear ultrasonic motor vibrator module of the first embodiment of the utility model is shown;
[0031] Figure 6 A schematic diagram showing a vibrator of a linear ultrasonic motor vibrator module of a first embodiment of the utility model is shown;
[0032] Figure 7 A schematic diagram showing a driving arm of a linear ultrasonic motor electronic device according to a first embodiment of the utility model is shown;
[0033] Figure 8a and Figure 8b It shows the working schematic diagram of different modes of the linear ultrasonic motor vibrator module of the first embodiment of the utility model;
[0034] Fig. 9 A schematic diagram of a linear ultrasonic motor vibrator module according to a second embodiment of the present utility model is shown;
[0035] Fig.10 The right side view of the linear ultrasonic motor vibrator module according to the second embodiment of the utility model is shown. DETAILED DESCRIPTION
[0036] The present invention will be described in more detail below with reference to the accompanying drawings. In each of the accompanying drawings, the same elements are represented by similar reference numerals. For the sake of clarity, the various parts in the accompanying drawings are not drawn to scale. In addition, some well-known parts may not be shown.
[0037] It should be understood that when describing a structure, when a component or a region is referred to as being "on" or "over" another component or region, it may mean that it is directly on the other component or region, or that other components or regions are included between it and the other component or region. Furthermore, if the part is turned over, the component or region will be "below" or "under" the other component or region.
[0038] If it is intended to describe a situation where a component or region is directly on another component or region, this document will use the expression “directly on” or “on and adjacent to”.
[0039] Many specific details of some embodiments of the present invention are described below, such as the structure, materials, dimensions, processing techniques and technologies of the components, so as to more clearly understand the present invention. However, as those skilled in the art will appreciate, the present invention may be implemented without following these specific details.
[0040] The present invention may be embodied in various forms, some examples of which will be described below.
[0041] Figure 1A schematic diagram of a linear ultrasonic motor vibrator module of the first embodiment of the utility model is shown; the linear ultrasonic motor vibrator module includes: a vibrator 110, a driving arm 120, a piezoelectric ceramic group 130 and a pre-tightening structure 140, wherein the vibrator 110 has a first surface and a second surface relative to each other, the vibrator 110 is annular, and the two opposite sides of its outer annular surface are provided with connecting ends 111 extending outward, and the two opposite sides of the vibrator 110 where the connecting ends 111 are not provided are driving feet 114. The vibrator 110 also includes a first through hole 112 and second through holes 113 located on both sides of the first through hole. The first through hole 112 is, for example, a circular through hole. The first through hole 112 is perpendicular to the first surface and the second surface. The axis of the second through hole 113 is parallel to the axis of the first through hole 112. The centers of the second through hole 113 and the first through hole 112 are both located on the central axis of the vibrator 110. The two working modes of the linear ultrasonic motor vibrator module are adjusted through the second through hole 113 to reduce the frequency difference between the two working modes. The second through hole 113 is, for example, also a circular through hole. The shape of the vibrator 110 can be elliptical, circular, rectangular or other shapes, and the first through hole 112 can also be elliptical, oval or other shapes. other shapes and the number of the first through hole 112 is at least one; the vibrator 110 is connected to the driving arm 120 through the connecting ends 111 on both sides, the driving arm 120 is provided with a receiving groove 121, and the piezoelectric ceramic group 130 is arranged in the receiving groove 121, and a fixing structure 115 is also provided between the second through hole 113 and the receiving groove 121 on the connecting end of the vibrator 110. In this embodiment, the fixing structure 115 is, for example, a positioning hole, and the positioning hole completely penetrates the vibrator 110. The positioning hole can be matched with the corresponding positioning pin to achieve the fixation of the linear ultrasonic motor vibrator module; the positioning hole is, for example, a circular through hole, an elliptical through hole, a polygonal through hole, etc., and the positioning hole can be specifically designed according to the specific situation.The piezoelectric ceramic group 130 includes a piezoelectric ceramic 131 and a conductive sheet 132. The piezoelectric ceramic 131 and the conductive sheet 132 are both rectangular, for example. The conductive sheet 132 also includes a connecting end extending outward for electrical connection. The connecting ends extending from the conductive sheet 132 are, for example, located on the same side and aligned. In other embodiments, the connecting ends can be staggered. The piezoelectric ceramic group 130 has two opposite surfaces, one surface is tightly attached to the end face of the connecting end, and the other surface is tightly attached to the end face of the pre-tightening structure 140. The pre-tightening structure 140 makes the piezoelectric ceramic group 130 and the end face of the connecting end of the vibrator 110 tightly attached. The pre-tightening structure 140 includes, for example, a bolt 141 and a pressure block 142. The end of the driving arm 120 close to the vibrator 110 is provided with a first connecting structure for connecting to the connecting end 111. The connecting end 111 is provided with a second connection structure corresponding thereto, and a threaded hole matching with the bolt 141 is provided at one end of the driving arm 120 away from the vibrator 110, and the threaded hole penetrates the side wall of the driving arm 120 and is connected with the receiving groove 121, and one end of the bolt 141 passes through the threaded hole and extends into the receiving groove 121, and the pressing block 142 is also located in the receiving groove 121, and the pressing block 142 is, for example, rectangular, and one side surface thereof contacts the bolt 141, and the other side surface contacts the piezoelectric ceramic group 130, and the bolt 141 provides a pre-tightening force to the piezoelectric ceramic group 130 through the pressing block 142 and presses the piezoelectric ceramic group 130 toward the end face of the connecting end 111, and by providing the pressing block 142, the bolt 141 can be prevented from directly contacting with the piezoelectric ceramic group 130, and the piezoelectric ceramic group 130 can be prevented from being damaged by uneven force. Optionally, the pressing block 132 is made of metal. In other embodiments, a pressing block 142 may also be disposed between the piezoelectric ceramic group 130 and the end surface of the connecting end 111 .
[0042] Figure 2The front view of the linear ultrasonic motor vibrator module of the first embodiment of the utility model is shown; it can be seen from the front view that the linear ultrasonic motor vibrator module is symmetrical on the left and right, the first through hole 112 of the vibrator 110, the second through holes 113 on both sides of the first through hole 112, the fixing structure 115 and the center of the driving arm 120 are all located on the central axis of the vibrator 110, and the driving arm 120 is connected to the connecting end of the vibrator 110 through a mortise and tenon structure. Specifically, the end of the connecting end 111 is, for example, T-shaped, and the driving arm 120 is, for example, C-shaped, and at least a portion of the connecting end 111 extends into the driving arm 120 to achieve the connection between the driving arm 120 and the connecting end 111; of course, both can also adopt other shapes and structures, such as dovetail tenons. Since the driving arm 120 and the vibrator 110 are split designs, the two can be made of different materials. Specifically, the vibrator 110 is, for example, aluminum alloy, and the driving arm 120 is, for example, 45 steel. By using a heavier material for the driving arm 120, the vibration energy of the piezoelectric ceramic group 130 can be effectively reduced from being lost from the outside of the driving arm 120. The vibrator 110 uses a lighter material to amplify the vibration amplitude, further improve the vibration of the vibrator 110, and thus improve work efficiency.
[0043] Figure 3 The first embodiment shows a linear ultrasonic motor vibrator module along Figure 2 ; it can be seen from the cross-sectional diagram that a threaded hole 122 matching the bolt 141 is provided at one end of the driving arm 120 away from the vibrator 110, and the threaded hole 122 has a step, for example, and the bolt hole 122 passes through the side wall of the driving arm 120 and is connected to the receiving groove 121, and one end of the bolt 141 extends into the receiving groove 121 through the threaded hole 122, and the pressing block 142 is also located in the receiving groove 121. The pressing block 142 is, for example, rectangular, and one side surface thereof is in contact with the bolt 141, and the other side surface is in contact with the piezoelectric ceramic group 130. The bolt 141 provides a pre-tightening force to the piezoelectric ceramic group 130 through the pressing block 142 and presses the piezoelectric ceramic group 130. By setting the pressing block 142, direct contact between the bolt 141 and the piezoelectric ceramic group 130 can be avoided, thereby preventing the piezoelectric ceramic group 130 from being damaged by uneven force. The length of the bolt 141 in the figure is relatively short, and the length of the bolt 141 can be adjusted according to the requirement of the pre-tightening force and the depth of the threaded hole 122 to avoid the piezoelectric ceramic group 130 being unable to be compressed after the bolt 141 is screwed to the bottom.
[0044] The receiving groove 121, for example, passes through the first surface and the second surface of the vibrator, the conductive sheet 132 is, for example, a copper sheet, the piezoelectric ceramic 131 and the conductive sheet 132 are alternately arranged, and the embodiment in the figure adopts a combination of 4 piezoelectric ceramics 131 and 5 conductive sheets 132. There are no perforations in the middle of the piezoelectric ceramics 131 and the conductive sheets 132 in the figure. This design ensures the strength of the piezoelectric ceramic 131, avoids the problem of opening holes in the piezoelectric ceramic and damaging and breaking the piezoelectric ceramic during the tightening of the bolts due to insufficient centering, and also reduces the difficulty of assembly, improves the product yield and production efficiency. Of course, the number of piezoelectric ceramics 131 and conductive sheets 132 can be adjusted according to demand, for example, the piezoelectric ceramic 131 is 2n sheets, the conductive sheet 132 is 2n+1 sheets, and 1≤n≤3, n is a positive integer. The outer surfaces of the piezoelectric ceramics 131, the conductive sheets 132 and the pressing block 142 are flush with the first surface and the second surface of the vibrator 110.
[0045] Figure 4 The schematic diagram of the piezoelectric ceramic group in the linear ultrasonic motor vibrator module of the first embodiment of the utility model is shown. The piezoelectric ceramic group includes five conductive sheets 132 and four piezoelectric ceramics 131, wherein the piezoelectric ceramic 131 is a rectangular sheet without perforations, and the thickness of the piezoelectric ceramic 131 is, for example, 0.5 mm to 5 mm, and the thickness of each piezoelectric ceramic is equal. In other embodiments, the piezoelectric ceramic 131 can also be circular, polygonal, etc., and the piezoelectric ceramic 131 can also have perforations. The polarization directions of adjacent piezoelectric ceramics 131 are opposite, the outermost conductive sheet 132 is connected to the negative pole of the driving power supply, and the adjacent two conductive sheets 132 are respectively connected to the positive pole and the negative pole of the driving power supply. Specifically, from left to right, the conductive sheets 132 at the 1st, 3rd, and 5th positions are connected to the negative pole, and the conductive sheets 132 at the 2nd and 4th positions are connected to the positive pole. The piezoelectric ceramic groups in the other embodiments are similar and will not be elaborated herein. Of course, the protruding parts of the conductive sheet 132 connected to the positive electrode and the conductive sheet 132 connected to the negative electrode can be staggered to facilitate distinction and connection, and the number of conductive sheets 132 and piezoelectric ceramics 131 can be adjusted accordingly as required.
[0046] Figure 5 The right side view of the linear ultrasonic motor vibrator module of the first embodiment of the utility model is shown; the outer annular surfaces on the opposite sides of the vibrator 110 without the connection end 111 are used as driving feet 114.
[0047] Figure 6 and Figure 7Schematic diagrams of the vibrator and driving arm of the linear ultrasonic motor vibrator module of the first embodiment of the utility model are respectively shown; the vibrator 110 has connecting ends 111 on opposite left and right sides, and the connecting end 111 is used to connect to the driving arm 120, for example, the first connecting structure includes a protrusion, and the second connecting structure includes a groove corresponding to the protrusion. Specifically, the upper side and the lower side of the connecting end 111 in this embodiment are symmetrically provided with grooves 1111, and accordingly, the driving arm 120 is provided with a protrusion 123 corresponding to the groove 1111. The connection between the driving arm 120 and the connecting end 111 is achieved by placing the protrusion 123 in the groove 1111, and after the two are connected, the end face of the connecting end 111 is located in the accommodating groove 121 of the driving arm 120.
[0048] Figure 8a and Figure 8b The schematic diagram of the operation of the linear ultrasonic motor vibrator module of the first embodiment of the utility model shows different modes; a high-frequency signal with a phase difference of 90° is applied by two piezoelectric ceramic groups 130 located on the left and right sides of the vibrator 110, thereby exciting two vibration modes with a time difference of 90° to form an elliptical trajectory, thereby driving the structure in contact with the driving foot to move.
[0049] Specifically, the linear ultrasonic motor vibrator module is fixed at the node surface 1 and the node surface 2, the node surface 1 and the node surface 2 correspond to the positioning hole 114 or the boss, and the driving foot 115 is located in the node surface 3. When the second-order vibration mode of the linear ultrasonic motor is excited, Figure 8a As shown, the vibrator modules on both sides of the nodal plane 1 move away from the nodal plane 1, and the vibrator modules on both sides of the nodal plane 2 move close to the nodal plane 2, or the vibrator modules on both sides of the nodal plane 1 move close to the nodal plane 1, and the vibrator modules on both sides of the nodal plane 2 move away from the nodal plane 2, so that the driving foot 115 vibrates left and right, providing the driving foot 115 with left and right translation; when the third-order vibration mode of the linear ultrasonic motor is excited, as shown in FIG. Figure 8b As shown, the vibrator modules on both sides of the nodal plane 1 move away from the nodal plane 1, the vibrator modules on both sides of the nodal plane 3 move close to the nodal plane 3, and the vibrator modules on both sides of the nodal plane 2 move away from the nodal plane 2, or the vibrator modules on both sides of the nodal plane 1 move close to the nodal plane 1, the vibrator modules on both sides of the nodal plane 3 move away from the nodal plane 3, and the vibrator modules on both sides of the nodal plane 2 move close to the nodal plane 2, so that the driving foot 115 vibrates up and down, providing the driving foot 115 with up and down translation. When two electrical signals with a phase difference of ninety degrees are applied to the two piezoelectric ceramic groups respectively, two modes will be excited and form an elliptical trajectory, thereby outputting displacement to the outside.
[0050] Specifically, for example, taking the sinusoidal signal applied to the piezoelectric ceramic 131 on the left driving arm 120 as a reference, at the same electrical signal frequency, when the sinusoidal signal applied to the piezoelectric ceramic 131 on the right driving arm 120 leads the phase of the sinusoidal signal applied to the piezoelectric ceramic 131 on the left driving arm 120 by 90°, the linear ultrasonic motor vibrator module will respectively generate two vibration working modes, and the two vibration working modes of the linear ultrasonic motor vibrator module are superimposed on each other, so that the driving foot 114 performs an elliptical motion, thereby pushing the structure in contact with the driving foot to move forward; at the same electrical signal frequency, when the sinusoidal signal applied to the piezoelectric ceramic 131 on the right driving arm 120 lags the phase of the sinusoidal signal applied to the piezoelectric ceramic 131 on the left driving arm 120 by 90°, the driving foot 114 can push the structure in contact with the driving foot to move in the opposite direction.
[0051] Fig. 9 and Fig.10 The schematic diagram and right view of the linear ultrasonic motor vibrator module of the second embodiment of the utility model are shown. Its overall structure is basically similar to that of the first embodiment, except that the fixing structure 115 in the second embodiment adopts a boss perpendicular to the first surface and the second surface, and the driving arm 120 and the vibrator 110 in the second embodiment are an integrated structure, and the boss is convex in the cross section perpendicular to the first surface. Through the cooperation of multiple surfaces of the boss with the fixing structure, the constraints on multiple degrees of freedom of the linear ultrasonic motor vibrator module are realized, thereby realizing the fixation of the linear ultrasonic motor vibrator module. The protrusion on the boss can be a semicircular protrusion, a rectangular protrusion, a triangular protrusion, etc., or a concave in the middle and convex at both ends, etc., and can be specifically designed according to specific circumstances.
[0052] The linear ultrasonic motor vibrator module provided by the utility model is provided with a receiving groove on the driving arm, the piezoelectric ceramic group is embedded in the receiving groove, and then the pre-tightening structure extends into the receiving groove to realize the compression of the piezoelectric ceramic group, thereby avoiding the perforation of the piezoelectric ceramic, ensuring the strength of the piezoelectric ceramic, avoiding the problem of opening holes in the piezoelectric ceramic and the damage and breakage of the piezoelectric ceramic during the tightening of the bolts due to insufficient concentricity, and also reducing the difficulty of assembly, improving the product yield and production efficiency. The pressure block located between the bolt and the piezoelectric ceramic group avoids direct contact between the bolt and the piezoelectric ceramic group, making the pre-tightening force distribution more uniform. The design of the receiving groove makes the assembly of the linear ultrasonic motor vibrator module more convenient and simple.
[0053] Furthermore, the driving arm and the vibrator can be designed as an integrated unit, which has a more compact structure and can effectively avoid wear and looseness between parts caused by vibration during use.
[0054] Furthermore, the driving arm and the vibrator can also be designed as a split type, so that the driving arm can be replaced, and a material different from that of the vibrator can be selected. Specifically, the material density of the vibrator is less than the material density of the driving arm. By selecting a heavier material for the driving arm, the vibration energy of the piezoelectric ceramic group can be effectively reduced from being lost from the outside of the driving arm, which significantly improves the vibration of the vibrator part, thereby improving the working efficiency of the linear ultrasonic motor vibrator module.
[0055] In the above description, the technical details such as the position combination and connection mode of each component are not described in detail. However, those skilled in the art should understand that various technical means can be used to form the required connection relationship, etc. In addition, in order to have the same function, those skilled in the art can also design a structure that is not completely the same as the structure described above. In addition, although each embodiment is described above separately, this does not mean that the measures in each embodiment cannot be used in combination to advantage.
[0056] The embodiments of the present invention are described above. However, these embodiments are for illustrative purposes only and are not intended to limit the scope of the present invention. The scope of the present invention is defined by the appended claims and their equivalents. Without departing from the scope of the present invention, a person skilled in the art may make various substitutions and modifications, which should all fall within the scope of the present invention.
Claims
1. A linear ultrasonic motor vibrator module, characterized in that: include: A vibrator, the vibrator is annular, and the outer ring surface of the vibrator has two connecting ends arranged oppositely; Two driving arms, the two driving arms are respectively connected to the two connecting ends of the vibrator, and each driving arm is also provided with a receiving groove; A piezoelectric ceramic group is located in the receiving groove of the driving arm, and the piezoelectric ceramic group transmits vibration to the vibrator through the driving arm; A pre-tightening structure, at least partially located in the receiving groove of the driving arm, wherein the pre-tightening structure presses the piezoelectric ceramic group; The piezoelectric ceramic group has two opposite surfaces, one surface is in close contact with the end face of the connecting end, and the other surface is in close contact with the end face of the pre-tightening structure. The pre-tightening structure makes the piezoelectric ceramic group and the end face of the connecting end of the vibrator in close contact.
2. The linear ultrasonic motor vibrator module according to claim 1, characterized in that: The driving feet of the vibrator are located on the outer side surfaces on two opposite sides where the connecting ends are not arranged.
3. The linear ultrasonic motor vibrator module according to claim 1, characterized in that: The piezoelectric ceramics in the piezoelectric ceramic group have no perforations.
4. The linear ultrasonic motor vibrator module according to claim 1, characterized in that: The vibrator comprises a first through hole, and the connecting end is further provided with a second through hole, the axis of the second through hole is parallel to the axis of the first through hole, and the center of the second through hole and the center of the first through hole are both located on the central axis of the vibrator.
5. The linear ultrasonic motor vibrator module according to claim 1, characterized in that: The driving arm and the vibrator are an integrated structure, or the driving arm and the vibrator are connected by a mortise and tenon structure, a first connecting structure is arranged at one end of the driving arm close to the vibrator, and a second connecting structure corresponding to the first connecting structure is arranged at the connecting end.
6. The linear ultrasonic motor vibrator module according to claim 1, characterized in that: A threaded hole communicating with the receiving groove is provided at one end of the driving arm away from the vibrator, and the pre-tightening structure comprises a bolt, which passes through the threaded hole to press the piezoelectric ceramic group in the receiving groove toward the end surface of the connecting end.
7. The linear ultrasonic motor vibrator module according to claim 5, characterized in that: When the driving arm and the vibrator are connected by a mortise and tenon structure, the driving arm includes a C shape, the connecting end includes a T shape, and at least a portion of the connecting end extends into the driving arm to achieve connection between the driving arm and the connecting end.
8. The linear ultrasonic motor vibrator module according to claim 5, characterized in that: The first connection structure includes a protrusion, and the second connection structure includes a groove corresponding to the protrusion.
9. The linear ultrasonic motor vibrator module according to claim 4, characterized in that: The vibrator comprises a first surface and a second surface opposite to each other, and fixing structures for fixing the linear ultrasonic motor vibrator module are arranged on the first surface and the second surface of the vibrator.
10. The linear ultrasonic motor vibrator module according to claim 9, characterized in that: The fixing structure is located between the second through hole and the end surface of the connecting end, and the fixing structure includes a boss or a positioning hole.
11. The linear ultrasonic motor vibrator module according to claim 10, characterized in that: The cross section of the boss taken along a plane perpendicular to the first surface is in a convex shape.
12. The linear ultrasonic motor vibrator module according to claim 10, characterized in that: The positioning holes on the first surface and the second surface are connected.
13. The linear ultrasonic motor vibrator module according to claim 6, characterized in that: The pre-tightening structure further includes a pressing block, and the pressing block is at least located between the bolt and the piezoelectric ceramic group.
14. The linear ultrasonic motor vibrator module according to claim 1, characterized in that: The accommodating groove passes through two opposite side surfaces of the driving arm.
15. The linear ultrasonic motor vibrator module according to claim 1, characterized in that: The piezoelectric ceramic group includes a plurality of piezoelectric ceramics and a plurality of conductive sheets, the piezoelectric ceramics and the conductive sheets are alternately arranged, the number of the piezoelectric ceramics is 2n, the number of the conductive sheets is 2n+1, and 1≤n≤3, n is a positive integer, and the conductive sheets are located outside the piezoelectric ceramic group.
16. The linear ultrasonic motor vibrator module according to claim 1, characterized in that: The material density of the vibrator is smaller than the material density of the driving arm.