Ultrasonic linear actuation device utilizing standing wave oscillations for actuation

Patent metadata

Field	Value
Publication number	US-11043907-B2
Application number	US-201816231651-A
Country	US
Kind code	B2
Filing date	Dec 24, 2018
Priority date	Nov 27, 2018
Publication date	Jun 22, 2021
Grant date	Jun 22, 2021

Abstract

An ultrasonic linear actuation device includes a mover and a plurality of stator sets. The mover includes at least one mover rack. The plurality of stator sets is located in correspondence with the mover. Each of the plurality of stator sets includes an actuating component and a plurality of stator racks. The actuating component is used for stimulating corresponding one of the plurality of stator sets to generate standing-wave oscillations in an oscillation direction, such that the plurality of stator racks of each of the plurality of stator sets can engage the at least one mover rack of the mover to allow the stator racks to mesh the corresponding mover rack and thus to displace the mover in a moving direction.

First claim

What is claimed is:

1. An ultrasonic linear actuation device, comprising:
a mover, including at least one mover rack; and
a plurality of stator sets, located in correspondence with the mover, each of the plurality of stator sets including an actuating component and a plurality of stator racks, the actuating component being used for stimulating corresponding one of the plurality of stator sets to generate standing-wave oscillations in an oscillation direction, such that the plurality of stator racks of each of the plurality of stator sets engage the at least one mover rack of the mover to allow the stator racks to mesh the corresponding mover rack and thus to displace the mover in a moving direction.

2. The ultrasonic linear actuation device of claim 1 , wherein the plurality of stator sets are orderly arranged in the moving direction to have the plurality of stator racks of each of the plurality of stator sets to be positioned in correspondence with the at least one mover rack of the mover.

3. The ultrasonic linear actuation device of claim 2 , wherein the actuating component generates oscillatory motions to stimulate the plurality of stator sets orderly to generate the standing-wave oscillations.

4. The ultrasonic linear actuation device of claim 1 , further including an inter-stator spacing between two neighboring stator sets.

5. The ultrasonic linear actuation device of claim 4 , wherein the the inter-stator spacing of is less than or equal to ½ of a mover-tooth base width of the at least one mover rack.

6. The ultrasonic linear actuation device of claim 5 , wherein each of the plurality of stator racks has a plurality of stator teeth, and a tooth profile for the plurality of stator teeth is an asymmetric tooth profile.

7. The ultrasonic linear actuation device of claim 6 , wherein the tooth profile is a right-angle tooth profile, a right-angle trapezoidal tooth profile, or an asymmetric tooth profile including at least two of aforesaid tooth profiles.

8. The ultrasonic linear actuation device of claim 1 , wherein the plurality of stator sets includes three stator sets, and an inter-stator spacing among these three stator sets is less than or equal to ⅓ of a mover-tooth base width of the at least one mover rack.

9. The ultrasonic linear actuation device of claim 8 , wherein each of the plurality of stator racks has a plurality of stator teeth, and a tooth profile for the plurality of stator teeth is a symmetric tooth profile.

10. The ultrasonic linear actuation device of claim 9 , wherein the tooth profile is an isosceles triangular tooth profile, an isosceles trapezoidal tooth profile, an arc-shape tooth profile, or a symmetric tooth profile including at least two of aforesaid tooth profiles.

11. The ultrasonic linear actuation device of claim 1 , wherein each of the plurality of stator racks includes at least one stator-tooth contact surface, and the at least one mover rack includes at least one mover-tooth contact surface; wherein when the corresponding stator set generates the standing-wave oscillations, the at least one stator-tooth contact surface approaches and finally contacts the corresponding mover-tooth contact surface.

12. The ultrasonic linear actuation device of claim 11 , wherein the at least one mover rack includes a mover-tooth top, the mover-tooth top connects the at least one mover-tooth contact surface, and the moving direction of the mover is oblique to the at least one mover-tooth contact surface.

13. The ultrasonic linear actuation device of claim 1 , wherein each of the plurality of stator racks has a plurality of stator teeth, a tooth profile for the plurality of stator teeth is a triangular tooth profile, a trapezoidal tooth profile, an arc-shape tooth profile, or a combination including at least two said tooth profiles.

14. The ultrasonic linear actuation device of claim 1 , wherein the at least one mover rack has a plurality of mover teeth, a tooth profile for the plurality of mover teeth is a triangular tooth profile, a trapezoidal tooth profile, an arc-shape tooth profile, or a combination including at least two said tooth profiles.

15. The ultrasonic linear actuation device of claim 1 , wherein the actuating component is one of a piezoelectric actuator, an electrostatic actuator and an electromagnetic actuator.

16. The ultrasonic linear actuation device of claim 1 , wherein the oscillation direction is perpendicular to the moving direction.

17. The ultrasonic linear actuation device of claim 1 , wherein each of the plurality of stator sets further includes an elastic member for maintaining a distance between each of the plurality of stator racks and the corresponding mover rack.

18. The ultrasonic linear actuation device of claim 17 , further including a moving guide mechanism, the mover being to displace on the moving guide mechanism.

19. The ultrasonic linear actuation device of claim 18 , wherein the moving guide mechanism includes a base body, the base body includes a groove, and the groove allows the mover only to displace in the moving direction.

20. The ultrasonic linear actuation device of claim 19 , wherein each of the plurality of stator sets further includes a positioning member connected with the elastic member, the positioning member being fastened onto the base body.

21. The ultrasonic linear actuation device of claim 19 , wherein the moving guide mechanism includes:
a constraint member, located inside the groove of the base body; and
a sliding member, movably disposed on the constraint member, the sliding member displacing between two stop members of the constraint member so as to have the mover to displace in the moving direction.

Assignees

• Ind Tech Res Inst

Inventors

• Yang han-ping
• Yang Cheng-Ping
• XIE Kun-Ju
• Ma Shou-Cheng

Classifications

• H02N2/025 Primary

  Inertial sliding motors · CPC title

• H02N2/021 Primary

  using intermittent driving, e.g. step motors, piezoleg motors · CPC title