Piezoelectric motor structure

Abstract

The utility model relates to the technical field of piezoelectric motors, in particular to a piezoelectric motor structure, which comprises a mounting seat and a pre-tightening mechanism. A supporting sliding block is arranged on the mounting seat; the pre-tightening mechanism comprises a fixed seat, a rotating shaft which is in threaded connection with the fixed seat and is provided with a threaded part, two guide rods which are in sliding connection with the fixed seat, a connecting rod which is arranged on the guide rods, a fixed disc which is arranged on the connecting rod, a rotary connecting piece which is arranged on the fixed disc, four supporting rods which are symmetrically distributed, and sliding rods which are in sliding connection with the supporting rods; the disc is arranged on the sliding rod, the magnet is arranged on the disc, the two ends of the spring are arranged on the magnet and the supporting rod respectively, and the limiting sliding blocks are distributed on the sliding rod in an annular array mode. One end of the rotating shaft is inserted into the rotary connecting piece and rotationally connected with the rotary connecting piece, and the magnet is magnetically connected with the supporting sliding block. According to the utility model, the distribution uniformity of the action of the pre-tightening force on the supporting slide block is improved, and the operation difficulty of adjusting the pre-tightening force is reduced.

Description

Technical Field

[0001] This utility model relates to the field of piezoelectric motor technology, and in particular to a piezoelectric motor structure. Background Technology

[0002] Piezoelectric motors, as a new type of micro-actuator, utilize the inverse piezoelectric effect of piezoelectric ceramic blocks and the ultrasonic vibration of elastomers to convert microscopic deformations into macroscopic motion of a mover or slider through resonant amplification and electromechanical coupling. Due to their characteristics such as low speed, micro-displacement, large torque, noiseless operation, and self-locking upon power failure, piezoelectric motors are gradually replacing traditional motors as the mainstream in drive products.

[0003] Chinese patent CN113131786A discloses a rotary piezoelectric motor, including a base, a stator mechanism, and a mover mechanism. The base is L-shaped, with a square frame as its upright plate. The stator mechanism includes a cross-shaped frame, two pairs of rotating piezoelectric plates, and two pairs of clamping piezoelectric plates. The two pairs of rotating piezoelectric plates are mounted on a pair of vertical arms to form a drive unit; the two pairs of clamping piezoelectric plates are mounted on a pair of horizontal arms to form a clamping unit. The stator mechanism is fixedly mounted within the square frame of the base. The mover mechanism includes an output shaft and a support slider. The output shaft passes through the upper part of the support slider via a bearing, and the lower part of the support slider is fitted onto the base via a T-slot. This piezoelectric motor uses a sinusoidal signal to control the driving and clamping actions of the stator, achieving abrupt changes in contact between the stator and the output shaft. The stator and mover are driven by static friction, eliminating sliding friction and wear between them, thus extending the motor's lifespan.

[0004] However, the above technical solution has the following shortcomings: the contact or non-contact between the truncated cone tip of the output shaft and the inner wall of the truncated cone hole of the stator during the adjustment is achieved by rotating the nut. Not only is the stroke of the nut uncertain, but the spring acts on the lower end of the support slider, and the force distribution is uneven, which affects the friction when the truncated cone tip of the output shaft contacts. Utility Model Content

[0005] The purpose of this invention is to address the problems existing in the background technology by proposing a piezoelectric motor structure that improves the uniformity of the distribution of preload on the support slider and reduces the difficulty of adjusting the preload.

[0006] The present invention provides a piezoelectric motor structure, comprising a mounting base and a pre-tightening mechanism. A supporting slider is mounted on the mounting base. The pre-tightening mechanism includes a fixed base, a rotating shaft threaded onto the fixed base and having a threaded portion, two guide rods slidably connected to the fixed base, a connecting rod mounted on the guide rods, a fixed disc mounted on the connecting rods, a rotating connector mounted on the fixed disc, four symmetrically distributed support rods, a sliding rod slidably connected to the support rods, a disc mounted on the sliding rod, a magnet mounted on the disc, springs with their ends respectively mounted on the magnet and the support rod, and four limit sliders arranged in a ring array on the sliding rod. One end of the rotating shaft is inserted into the rotating connector and rotatably connected. The support rod has a groove inside for the limit slider to slide. The magnet and the supporting slider are magnetically connected.

[0007] Preferably, the mounting base is provided with a stator mechanism, the support slider is provided with an output shaft, and one end of the output shaft is provided with a frustum tip.

[0008] Preferably, a handwheel is provided at the end of the rotating shaft away from the rotating connector.

[0009] Preferably, the guide rod is provided with two axially distributed positioning holes, and a pin is inserted through the inside of the positioning holes.

[0010] Preferably, the mounting base is provided with a mounting plate, and a plurality of symmetrically distributed first fixing bolts are provided through the mounting plate. The mounting base is provided with a first threaded hole for threaded connection of the first fixing bolts.

[0011] Preferably, the support slider is provided with a sliding plate, and the mounting base is provided with a T-shaped groove for the support slider and the sliding plate to slide horizontally.

[0012] Preferably, the mounting base is provided with a waist-shaped hole, and a second fixing bolt is provided through the inside of the waist-shaped hole. The slide plate is provided with a second threaded hole for the second fixing bolt to be threadedly connected.

[0013] Compared with the prior art, the present invention has the following beneficial technical effects:

[0014] This utility model, through its pre-tightening mechanism, facilitates the adjustment of the force exerted on the support block during pre-tightening, and ensures a more uniform force distribution when the support slider is applied. Combined with the spring, this allows for a smoother and more stable contact between the tip of the frustum and the frustum hole, avoiding the cumbersome operation of manually adjusting the nut to change the pre-tightening force, reducing operational complexity, and demonstrating excellent practicality. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0016] Figure 2This is a split diagram of the support slider and mounting base of this utility model;

[0017] Figure 3 This is a partial cross-sectional schematic diagram of the pre-tightening mechanism of this utility model;

[0018] Figure 4 This is a cross-sectional view showing the connection of a portion of the structure of this utility model.

[0019] Reference numerals: 1. Mounting base; 2. Stator mechanism; 3. Support slider; 4. Output shaft; 5. Frustum tip; 6. Fixed base; 7. Mounting plate; 8. Rotating shaft; 9. Fixed disc; 10. Handwheel; 11. Connecting rod; 12. Guide rod; 13. Rotary connector; 14. Support rod; 15. Slide rod; 16. Disc; 17. Magnet; 18. Spring; 19. Limit slider; 20. Positioning hole; 21. Pin; 22. First fixing bolt; 23. Slide plate; 24. Second fixing bolt. Detailed Implementation

[0020] Example 1

[0021] like Figures 1-4 As shown, the piezoelectric motor structure proposed in this embodiment includes a mounting base 1 and a pre-tightening mechanism; a support slider 3 is provided on the mounting base 1, a stator mechanism 2 is provided on the mounting base 1, an output shaft 4 is provided on the support slider 3, and a frustum tip 5 is provided at one end of the output shaft 4.

[0022] The pre-tightening mechanism includes a fixed base 6, a rotating shaft 8 threadedly connected to the fixed base 6 and having a threaded portion, two guide rods 12 slidably connected to the fixed base 6, a connecting rod 11 set on the guide rod 12, a fixed disk 9 set on the connecting rod 11, a rotating connector 13 set on the fixed disk 9, and four symmetrically distributed support rods 14, a slide rod 15 slidably connected to the support rod 14, a disk 16 set on the slide rod 15, a magnet 17 set on the disk 16, a spring 18 with its two ends respectively set on the magnet 17 and the support rod 14, and four limit sliders 19 arranged in a ring array on the slide rod 15; one end of the rotating shaft 8 is inserted into the interior of the rotating connector 13 and rotatably connected, the interior of the support rod 14 is provided with a groove for the limit slider 19 to slide, the magnet 17 and the support slider 3 are magnetically connected, and a handwheel 10 is provided at the end of the rotating shaft 8 away from the rotating connector 13.

[0023] The guide rod 12 is provided with two axially distributed positioning holes 20. A pin 21 is inserted through the inside of the positioning hole 20. In fact, the distance between the two positioning holes 20 is relatively close. This variable is small due to the distance between the tip 5 of the frustum when it is in contact and when it is not in contact.

[0024] In this embodiment, when it is necessary to adjust the contact state between the frustum tip 5 on the output shaft 4 and the stator mechanism, that is, the contact or non-contact between the frustum tip 5 and the inner wall of the frustum hole in the stator mechanism, the rotating shaft 8 is rotated by the handwheel 10, so that the threaded part on the rotating shaft 8 is screwed into the fixed seat 6. At the same time, the rotating shaft 8 and the rotating connecting member 13 rotate. Under the guidance of the guide rod 12 and the connecting rod 11, the rotating shaft 8 drives the fixed disk 9 to move horizontally. The fixed disk 9 drives the slide rod 15 to move through the support rod 14. The slide rod 15 drives the disk 16 and the magnet 17 to move, and then through the magnet 16... The magnetic interaction between the 7 and the support slider 3 enables the adjustment of the preload of the support slider 3. The symmetrical distribution of the four discs 16 ensures a more uniform force distribution when acting on the support slider 3. The spring 18 ensures a smooth and stable contact between the tip 5 of the frustum and the frustum hole, avoiding the cumbersome operation of manually adjusting the nut to adjust the preload and reducing the complexity of operation. The pin 21 and through hole further ensure the stability of the preload mechanism, thereby improving the stability of the support slider 3 and demonstrating good practicality.

[0025] It should be noted that the stator mechanism 2, the support slider 3 and the output shaft 4 are all designed using the stator mechanism 2 and the mover mechanism in the invention patent with patent publication number "CN113131786A", and the drive and clamping actions of the stator are controlled by sinusoidal signals.

[0026] Example 2

[0027] like Figures 1-3 As shown, in this embodiment, a piezoelectric motor structure is proposed. Compared with the first embodiment, in this embodiment, a sliding plate 23 is provided on the support slider 3, a T-shaped groove is provided on the mounting base 1 for the support slider 3 and the sliding plate 23 to slide horizontally, an oblong hole is provided on the mounting base 1, a second fixing bolt 24 is provided through the oblong hole, and a second threaded hole is provided on the sliding plate 23 for the second fixing bolt 24 to be threadedly connected.

[0028] The mounting base 6 is provided with a mounting plate 7, and multiple symmetrically distributed first fixing bolts 22 are provided through the mounting plate 7. The mounting base 1 is provided with a first threaded hole for threaded connection of the first fixing bolts 22.

[0029] In this embodiment, when installing the support slider 3, the slide plate 23 on the support slider 3 is first aligned with the T-shaped groove and pushed in. Then, the mounting plate 7 is fixed on the mounting base 1 by the second fixing bolt 24 and the first threaded hole. The position of the support slider 3 is reinforced by the second fixing bolt 24 and the second threaded hole to ensure the stability of the output shaft 4 when rotating. The waist-shaped hole can adjust the position of the support slider 3.

[0030] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited thereto. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. A piezoelectric motor structure, characterized in that, include: Mounting base (1), on which a support slider (3) is provided; The pre-tightening mechanism includes a fixed base (6), a rotating shaft (8) threadedly connected to the fixed base (6) and having a threaded portion, two guide rods (12) slidably connected to the fixed base (6), a connecting rod (11) set on the guide rod (12), a fixed disk (9) set on the connecting rod (11), a rotating connector (13) set on the fixed disk (9), and four symmetrically distributed support rods (14), a slide rod (15) slidably connected to the support rod (14), a disc (16) set on the slide rod (15), a magnet (17) set on the disc (16), a spring (18) with its two ends respectively set on the magnet (17) and the support rod (14), and four limit sliders (19) arranged in a ring array on the slide rod (15); one end of the rotating shaft (8) is inserted into the interior of the rotating connector (13) and rotatably connected, the interior of the support rod (14) is provided with a groove for the limit slider (19) to slide, and the magnet (17) and the support slider (3) are magnetically connected.

2. The piezoelectric motor structure according to claim 1, characterized in that, The mounting base (1) is provided with a stator mechanism (2), and the support slider (3) is provided with an output shaft (4). One end of the output shaft (4) is provided with a frustum tip (5).

3. The piezoelectric motor structure according to claim 1, characterized in that, A handwheel (10) is provided at the end of the rotating shaft (8) away from the rotating connector (13).

4. The piezoelectric motor structure according to claim 1, characterized in that, The guide rod (12) is provided with two axially distributed positioning holes (20), and a pin (21) is provided through the inside of the positioning hole (20).

5. The piezoelectric motor structure according to claim 1, characterized in that, The mounting base (6) is provided with a mounting plate (7), and multiple symmetrically distributed first fixing bolts (22) are provided through the mounting plate (7). The mounting base (1) is provided with a first threaded hole for threaded connection of the first fixing bolts (22).

6. The piezoelectric motor structure according to claim 1, characterized in that, The support slider (3) is provided with a slide plate (23), and the mounting base (1) is provided with a T-shaped groove for the support slider (3) and the slide plate (23) to slide horizontally.

7. The piezoelectric motor structure according to claim 6, characterized in that, The mounting base (1) is provided with a waist-shaped hole, and a second fixing bolt (24) is provided through the inside of the waist-shaped hole. The sliding plate (23) is provided with a second threaded hole for the second fixing bolt (24) to be threaded.

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