Pre-pressing assembly and piezoelectric driving device

Abstract

The utility model provides a pre-pressing assembly and a piezoelectric driving device, and relates to the technical field of optical element driving. The pre-pressing structure provides pre-pressing force between a driving assembly and a driven part, and comprises a base, a first pressing plate, a second pressing plate and a driving assembly, the prepressing carrier is fixedly connected to the driving assembly and provided with a second inclined plane, and the first inclined plane is parallel to the second inclined plane; the pre-pressing magnets comprise a first magnet and a second magnet, the first magnet is fixedly arranged on the first inclined surface, and the second magnet is fixedly arranged on the second inclined surface; the first magnet and the second magnet attract each other and are partially overlapped, and under the action of the multidirectional magnetic attraction force, the pre-pressing carrier generates pre-pressing force between the driving assembly and the driven assembly. According to the technical scheme, the problems that in the prior art, a pre-pressing structure is low in reliability, the provided pre-pressing force direction is single, and pre-pressing is not stable can be solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of optical element driving, in particular to a pre-pressing assembly and a piezoelectric driving device. BACKGROUND

[0002] With the development of science and technology, driving devices gradually tend to miniaturization and silence. The driving devices of existing small instruments usually adopt the forms of step motor driving or electromagnetic driving. However, the existing step motor driving and electromagnetic driving usually adopt direct fixation to realize pre-pressing fixation. For a piezoelectric driving device, since the piezoelectric driving relies on the modal change of a piezoelectric element, the piezoelectric element generates deformation through an elastic body to drive a driven member to move under the action of friction. The direct fixation mode will cause unstable friction between the piezoelectric element and the driven member, resulting in low driving precision. The existing pre-pressing mode usually adopts elastic members such as spring sheets and springs to realize pre-pressing fixation. The pre-pressing mode provides a single pre-pressing force direction, and the reliability of the elastic members is unstable under the influence of fatigue strength, that is, the provided pre-pressing force is unstable. CONTENT OF THE UTILITY MODEL

[0003] The purpose of the embodiments of the present application is to provide a pre-pressing assembly and a piezoelectric driving device to solve the problems of low reliability of the pre-pressing structure, single pre-pressing force direction and unstable pre-pressing in the prior art.

[0004] To solve the above technical problems, the embodiments of the present application provide the following technical solutions.

[0005] The first aspect of the present application provides a pre-pressing assembly for providing a pre-pressing force between a driving assembly and a driven member, comprising:

[0006] a base provided with a first inclined surface;

[0007] a pre-pressing carrier fixedly connected to the driving assembly, the pre-pressing carrier being provided with a second inclined surface, the first inclined surface being parallel to the second inclined surface;

[0008] a pre-pressing magnet comprising a first magnet and a second magnet, the first magnet being fixedly arranged on the first inclined surface, and the second magnet being fixedly arranged on the second inclined surface; the first magnet and the second magnet are attracted to each other and partially overlap, and under the action of multi-directional magnetic attraction, the pre-pressing carrier generates a pre-pressing force between the driving assembly and the driven assembly.

[0009] In some modified embodiments of the first aspect of the present application, the base is provided with a first groove, and the pre-pressing carrier is arranged in the first groove; the pre-pressing assembly further comprises an elastic member, the elastic member is arranged in the first groove, one end of the elastic member abuts against the inner side wall of the first groove, and the other end of the elastic member abuts against one side of the pre-pressing carrier away from the driving assembly.

[0010] In some variations of the first aspect of the application, the second inclined surface portion is provided with a step, the second magnet is arranged on the step, and the second magnet is arranged to abut the pre-pressing carrier on a side of the driving assembly.

[0011] The second aspect of the application provides a piezoelectric driving device, comprising a driving assembly arranged in the base, a driven member, and a pre-pressing assembly as described above; one end of the driving assembly abuts the driven member, and a part of the driving assembly is fixedly connected to the pre-pressing carrier, and the pre-pressing assembly provides a pre-pressing force for the driving assembly and the driven member.

[0012] In some variations of the second aspect of the application, the driving assembly comprises a piezoelectric actuator and a circuit board, the piezoelectric actuator comprises at least one piezoelectric element and an elastic body, the piezoelectric element is fixed to the first face and / or the second face of the elastic body, and the piezoelectric element is electrically connected to the circuit board.

[0013] In some variations of the second aspect of the application, one side of the elastic body extends to form a fixing portion, the fixing portion is provided with a hole, and the pre-pressing carrier is fixedly connected to the elastic body by a fixing column passing through the hole.

[0014] In some variations of the second aspect of the application, one piezoelectric element is arranged, and the piezoelectric element is fixedly arranged on the first face or the second face of the elastic body.

[0015] Alternatively, two piezoelectric elements are arranged, and the two piezoelectric elements are arranged on the first face and the second face of the elastic body, respectively.

[0016] In some variations of the second aspect of the application, at least one actuating protrusion is arranged on the side of the elastic body close to the driven member, and the actuating protrusion abuts the driven member.

[0017] In some variations of the second aspect of the application, when two actuating protrusions are arranged, the two actuating protrusions are arranged at intervals, and an adjusting protrusion is arranged between the two actuating protrusions for adjusting the piezoelectric actuator.

[0018] In some variations of the second aspect of the application, grooves are arranged on both sides of the elastic body for adjusting the vibration mode of the piezoelectric actuator.

[0019] Compared with the prior art, the pre-pressing assembly provided by the first aspect of the present application has a slope on the pre-pressing carrier and the base, and the pre-pressing magnets are arranged on the slopes, respectively. The first magnet and the second magnet are misaligned and attracted to each other. Under the action of the multi-directional magnetic attraction force, the stability of the connection between the pre-pressing carrier and the driving assembly is ensured, and the pre-pressing force is provided for the driving assembly, the friction force between the driving assembly and the driven part is increased, the stability of the pre-pressing of the pre-pressing carrier on the driving assembly is improved, and a certain limiting effect on the pre-pressing carrier and the driving assembly is generated. BRIEF DESCRIPTION OF DRAWINGS

[0020] The above and other objects, features and advantages of the exemplary embodiments of the present application will be more apparent from the following detailed description read in conjunction with the accompanying drawings, in which several embodiments of the present application are shown by way of example, and wherein like reference numerals refer to like elements or parts throughout. In the drawings:

[0021] Figure 1 An exploded structural schematic view of the pre-pressing assembly of Embodiment One is schematically shown;

[0022] Figure 2 An exploded structural schematic view of the first magnet and the second magnet in Embodiment One is schematically shown;

[0023] Figure 3 A structural schematic view of the piezoelectric driving device in Embodiment Two is schematically shown;

[0024] Figure 4 An exploded structural schematic view of the piezoelectric driving device in Embodiment Two is schematically shown;

[0025] Figure 5 A cross-sectional view of the piezoelectric driving device in Embodiment Two is schematically shown; Figure 3

[0026] Figure 6 An exploded structural schematic view of the driving assembly in Embodiment Two is schematically shown;

[0027] Figure 7 A structural schematic view of the elastic body in Embodiment Two is schematically shown.

[0028] BRIEF DESCRIPTION OF DRAWINGS

[0029] ​1, pre-pressing assembly; 11, base; 111, first inclined surface; 112, first groove; 12, pre-pressing carrier; 121, second inclined surface; 13, pre-pressing magnet; 131, first magnet; 132, second magnet; 14, elastic member; 2, driving assembly; 21, piezoelectric actuator; 211, piezoelectric element; 212, elastic body; 2121, fixed part; 21211, hole; 2122, actuating protrusion; 2123, groove; 22, circuit board; 3, driven member; 4, fixing column. DETAILED DESCRIPTION

[0030] Exemplary embodiments of the present disclosure will be described in detail with reference to the drawings. Although exemplary embodiments of the present disclosure are shown in the drawings, it is understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided so that the present disclosure can be more thoroughly understood, and the scope of the present disclosure can be accurately conveyed to those skilled in the art.

[0031] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in the present application should be understood as the general meaning understood by those skilled in the art to which the present application belongs. Embodiment One

[0032] As shown in Figure 1 , Figure 2 , the present embodiment one provides a pre-pressing assembly, the pre-pressing assembly 1 provides a pre-pressing force between the driving assembly 2 and the driven member 3, the pre-pressing assembly 1 includes a base 11, a pre-pressing carrier 12 and a pre-pressing magnet 13, the base 11 is provided with a first inclined surface 111; the pre-pressing carrier 12 is fixedly connected to the driving assembly 2, the pre-pressing carrier 12 is provided with a second inclined surface 121 parallel to the first inclined surface 111; the pre-pressing magnet 13 includes a first magnet 131 and a second magnet 132, the first magnet 131 is fixedly arranged on the first inclined surface 111, the second magnet 132 is fixedly arranged on the second inclined surface 121, the first magnet 131 and the second magnet 132 are partially overlapped and arranged by being attracted to each other, the first magnet 131 and the second magnet 132 are misaligned and attracted to each other, generating a first magnetic force perpendicular to the inclined surface, as shown in direction a in Figure 2 , the first magnetic force can simultaneously generate corresponding forces in directions b and c in Figure 2 , ensuring the stability of the connection between the pre-pressing carrier 12 and the driving assembly 2.

[0033] In this embodiment, the pre-compression component 1 has a first inclined surface 111 on the base 11 and a second inclined surface 121 parallel to the first inclined surface 111 on both side walls of the pre-compression carrier 12. A first magnet 131 is fixedly disposed on the first inclined surface 111 and a second magnet 132 is fixedly disposed on the second inclined surface 121. The first magnet 131 and the second magnet 132 are attracted to each other and partially overlap, so that the first magnet 131 and the second magnet 132 are attracted to each other in a staggered manner. A second magnetic attraction force is generated between the first magnet 131 and the second magnet 132. The direction of the second magnetic attraction force is perpendicular to the direction of the first magnetic attraction force, which provides multi-directional pre-compression force for the driving structure, thereby improving the stability of pre-compression and having a certain limiting effect.

[0034] like Figure 1 As shown, in a specific implementation, the base 11 is provided with a first groove 112, and the pre-compression carrier 12 is disposed in the first groove 112; the pre-compression component 1 also includes an elastic element 14, which is disposed in the first groove 112. One end of the elastic element 14 abuts against the inner sidewall of the first groove 112, and the other end abuts against the side of the pre-compression carrier 12 away from the drive component 2.

[0035] Specifically, the base 11 is provided with a first groove 112, which contains a pre-compression carrier 12, an elastic element 14, a drive assembly 2, and a driven element 3. An elastic element 14 is provided between the base 11 and the pre-compression carrier 12 to further provide pre-pressure. The elastic element 14 can be a structure with a certain elastic force, preferably a spring, to ensure that pre-pressure is further provided to the internal structure of the drive device.

[0036] like Figure 1 As shown, in a specific implementation, the second inclined surface 121 is provided with a step, the second magnet 132 is disposed on the step, and the side of the second magnet 132 facing the drive assembly 2 abuts against the pre-compression carrier 12.

[0037] Specifically, the second inclined surface 121 inside the pre-compression carrier 12 is provided with a step, and the second magnet 132 is disposed against the pre-compression carrier 12 on the side facing the drive assembly 2. The first inclined surface 111 inside the base 11 is provided with an abutment portion that is parallel to the step. The first magnet 131 is disposed on the abutment portion. The first magnet 131 and the second magnet 132 are misaligned and parallel to each other, so that the first magnet 131 and the second magnet 132 have an adsorption force that attracts each other. The first magnet 131 and the second magnet 132 are matched and are the same size. Example 2

[0038] like Figures 3 to 5As shown, the second embodiment provides a piezoelectric driving device, which comprises a driving assembly 2, a driven part 3 and a pre-pressing assembly 1 arranged in a base 11; one end of the driving assembly 2 is in abutment with the driven part 3, and a part of the driving assembly 2 is fixedly connected with a pre-pressing carrier 12, and the pre-pressing assembly 1 provides pre-pressing force for the driving assembly 2 and the driven part 3.

[0039] According to the stress analysis, Figure 2 The pre-pressing force in the a direction can be decomposed into the pre-pressing force in the first horizontal direction and the pre-pressing force in the vertical direction, i.e., the pre-pressing carrier 12 can provide the elastic body 212 with the pre-pressing force in the vertical direction (the c direction) Figure 2 The pre-pressing force in the first horizontal direction (the b direction) can limit the pre-pressing carrier 12 and the driving assembly 2 in this direction. Figure 2

[0040] Specifically, the pre-pressing assembly 1 in the second embodiment can directly use the pre-pressing assembly 1 provided in the first embodiment, and the specific implementation structure can refer to the related content described in the first embodiment, which will not be described here.

[0041] One end of the driving assembly 2 is in abutment with the driven part 3, and there is a certain friction force between them, and the driving assembly 2 drives the driven part 3 to produce displacement under the action of the friction force, and the other end of the driving assembly 2 is fixedly connected with the pre-pressing carrier 12 in the pre-pressing assembly 1.

[0042] As shown in Figure 3 , Figure 6 In a specific implementation, the driving assembly 2 comprises a piezoelectric actuator 21 and a circuit board 22, the piezoelectric actuator 21 comprises at least one piezoelectric element 211 and an elastic body 212, the piezoelectric element 211 is fixed on the first face and / or the second face of the elastic body 212, and the piezoelectric element 211 is electrically connected with the circuit board 22.

[0043] Specifically, the driving assembly 2 is composed of the piezoelectric actuator 21 and the circuit board 22, the piezoelectric actuator 21 comprises at least one piezoelectric element 211 and an elastic body 212, the piezoelectric element 211 is fixed on the elastic body 212, and the piezoelectric element 211 and the elastic body 212 are insulated, the piezoelectric element 211 can be provided with one or two, and preferably two, the piezoelectric element 211 is a piezoelectric ceramic sheet, the elastic body 212 is metal, and the piezoelectric element 211 is electrically connected with the circuit board 22.

[0044] One end of the circuit board 22 is wrapped outside the piezoelectric element 211 and the elastic body 212, and the other end extends to the outside of the driving device.

[0045] As shown in Figure 3 , Figure 6 ​As shown in the specific implementation, one side of the elastic body 212 extends to form a fixing portion 2121, and the fixing portion 2121 is provided with a hole 21211, and the pre-pressing carrier 12 is fixedly connected with the elastic body 212 through the fixing column 4 penetrating the hole 21211.

[0046] Further, when the piezoelectric element 211 is provided, the piezoelectric element 211 is fixedly arranged on the first face or the second face of the elastic body 212.

[0047] Or, when two piezoelectric elements 211 are provided, the two piezoelectric elements 211 are arranged on the first face and the second face of the elastic body 212, respectively.

[0048] As shown in the specific implementation, Figure 6 , Figure 7 Further, the elastic body 212 is provided with at least one actuating protrusion 2122 on the side face close to the driven member 3, and the actuating protrusion 2122 abuts against the driven member 3.

[0049] Specifically, the elastic body 212 is provided with at least one actuating protrusion 2122 on the side wall close to the driven member 3, and the number of the actuating protrusions 2122 is preferably two, and the effect of the two actuating protrusions 2122 is better, and a larger movement stroke can be adapted; the actuating protrusion 2122 abuts against the driven member 3, and when the first magnet 131 and the second magnet 132 are attracted to each other, the friction between the actuating protrusion 2122 and the driven member 3 is increased, and the elastic body 212 drives the driven member 3 to produce displacement under the action of the friction.

[0050] As shown in the specific implementation, Figure 7 In the specific implementation, when two actuating protrusions 2122 are provided, the two actuating protrusions 2122 are arranged at intervals, and an adjusting protrusion for adjusting the piezoelectric actuator is arranged between the two actuating protrusions 2122, and the adjusting protrusion is arranged to make the effect of the piezoelectric actuator 21 better.

[0051] As shown in the specific implementation, Figure 7 Further, the two sides of the elastic body 212 are provided with grooves 2123 for adjusting the vibration mode of the piezoelectric actuator 21.

[0052] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto, and any person skilled in the art can easily think of changes or replacements within the technical range disclosed in the present application, which shall be covered within the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A preload assembly for providing preload between a drive assembly and a driven component, characterized in that, The application relates to a pre-pressing assembly. The base is provided with a first inclined surface; The pre-pressing carrier is fixedly connected to the driving assembly, and is provided with a second inclined surface, the first inclined surface is parallel to the second inclined surface; The pre-pressing magnet comprises a first magnet and a second magnet, the first magnet is fixedly arranged on the first inclined surface, and the second magnet is fixedly arranged on the second inclined surface; the first magnet and the second magnet are adsorbed and partially overlapped, and under the action of a multi-directional magnetic force, the pre-pressing carrier generates a pre-pressing force between the driving assembly and the driven assembly.

2. The pre-press assembly of claim 1, wherein, The base is provided with a first groove, the pre-pressing carrier is arranged in the first groove; the pre-pressing assembly further comprises an elastic member, the elastic member is arranged in the first groove, one end of the elastic member abuts against the inner side wall of the first groove, and the other end of the elastic member abuts against one side of the pre-pressing carrier away from the driving assembly.

3. The pre-press assembly of claim 1, wherein, Part of the second inclined surface is provided with a step, the second magnet is arranged on the step, and one side of the second magnet away from the driving assembly abuts against the pre-pressing carrier.

4. A piezoelectric drive device characterized by comprising: The application relates to a pre-pressing assembly. The driving assembly, the driven member and the pre-pressing assembly are arranged in the base; One end of the driving assembly abuts against the driven member, a part of the driving assembly is fixedly connected to the pre-pressing carrier, and the pre-pressing assembly provides a pre-pressing force for the driving assembly and the driven member.

5. The piezoelectric drive device according to claim 4, wherein The driving assembly comprises a piezoelectric actuator and a circuit board, the piezoelectric actuator comprises at least one piezoelectric element and an elastic body, the piezoelectric element is fixed to the first face and / or the second face of the elastic body, and the piezoelectric element is electrically connected to the circuit board.

6. The piezoelectric drive device according to claim 5, wherein One side of the elastic body extends to form a fixing portion, the fixing portion is provided with a hole, and the pre-pressing carrier is fixedly connected to the elastic body through a fixing column penetrating the hole.

7. The piezoelectric drive device according to claim 5, wherein The piezoelectric element is arranged in one, and the piezoelectric element is fixed to the first face or the second face of the elastic body; Or, the piezoelectric element is arranged in two, and the two piezoelectric elements are arranged on the first face and the second face of the elastic body respectively.

8. The piezoelectric drive device according to claim 5, wherein The elastic body is provided with at least one actuating protrusion close to the side of the driven member, and the actuating protrusion abuts against the driven member.

9. The piezoelectric drive device according to claim 8, wherein When the actuating protrusion is arranged in two, the two actuating protrusions are arranged at intervals, and an adjusting protrusion for adjusting the piezoelectric actuator is arranged between the two actuating protrusions.

10. The piezoelectric drive device according to claim 5, wherein The elastic body is provided with grooves on two sides, and the grooves are used for adjusting the vibration mode of the piezoelectric actuator.

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