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CN-121993449-A - Actuating device

CN121993449ACN 121993449 ACN121993449 ACN 121993449ACN-121993449-A

Abstract

The present application relates to an actuator. The actuating device comprises a cylinder barrel, a piston, a transmission mechanism and a locking assembly, wherein the locking assembly comprises two groups of locking pieces, the locking pieces comprise locking tongues, the locking tongues are arranged on the piston and are movably arranged along the radial direction of the piston, the transmission mechanism comprises a movable assembly, the movable assembly is sleeved in the piston and is configured to drive the piston to move between an extending position and a contracting position along the axial direction of the cylinder barrel and drive the locking tongues to move along the radial direction of the piston, so that the locking tongues are clamped with the cylinder barrel or far away from the cylinder barrel to restrain or release the movement of the piston along the axial direction, and the locking tongues are at least in line contact with the cylinder barrel during clamping. The contact area of the bolt, the cylinder barrel and the sliding sleeve is larger, the bearing capacity, the impact resistance and the fatigue life of the bolt, the cylinder barrel and the sliding sleeve can be improved by increasing the size of the bolt or improving the hardness of the material, the constraint of the space structure and the brittleness of the material on the bearing capacity can be overcome, and the actuating device can meet the requirement of heavy-load working conditions.

Inventors

  • GAO XIAOHUI
  • FENG TIANSHUO
  • Tong Saisai
  • LIU YONGGUANG
  • LIU ZHIPENG

Assignees

  • 北京航空航天大学

Dates

Publication Date
20260508
Application Date
20260311

Claims (10)

  1. 1. An actuating device for an actuator of a vehicle, characterized by comprising the following steps: A cylinder (100); a piston (200) disposed in the cylinder (100); The locking assembly (400), the locking assembly (400) comprises two groups of locking pieces (410), the two groups of locking pieces (410) are arranged at intervals along the axial direction, the locking pieces (410) comprise lock tongues (411), and the lock tongues (411) are arranged on the piston (200) and are movably arranged along the radial direction of the piston (200); The transmission mechanism (300), the transmission mechanism (300) includes movable subassembly (310), movable subassembly (310) cover is located in piston (200), movable subassembly (310) are configured to drive piston (200) are followed the axial of cylinder (100) is between extension position and shrink position, and drive the spring bolt is followed the radial motion of piston, makes spring bolt (411) with cylinder (100) joint or keep away from cylinder (100), in order to retrain or release piston (200) are followed the axial motion, spring bolt (411) with at least line contact when cylinder (100) joint.
  2. 2. The actuating device according to claim 1, wherein the cylinder (100) is provided with two limiting grooves (110), the two limiting grooves (110) being arranged at intervals along the axial direction, the limiting grooves (110) being adapted to be engaged with the locking tongue (411), the locking tongue (411) comprising: The first curved surface (4111) is arranged at one end of the lock tongue (411) deviating from the axis of the piston (200), the first curved surface (4111) is configured to be clamped with the limiting groove (110), and on a section perpendicular to the axial direction, the first curved surface (4111) is arc-shaped, and the arc-shaped is correspondingly arranged with the limiting groove (110), so that the first curved surface (4111) is at least in line contact with the limiting groove (110).
  3. 3. The actuating device according to claim 2, characterized in that, in a section parallel to the axial direction and where the radius or diameter of the piston (200) is located, the first curved surfaces (4111) are each arc-shaped, which arc-shaped is arranged in correspondence with the limit groove (110).
  4. 4. The actuation device according to claim 2, characterized in that the locking tongue (411) further comprises: And a second curved surface (4112), wherein the second curved surface (4112) is arc-shaped in a cross section perpendicular to the axial direction, the arc shape is arranged corresponding to the outer circumferential surface of the movable assembly (310), and the second curved surface (4112) is configured to be in sliding fit with the outer circumferential surface of the movable assembly (310) along the axial direction.
  5. 5. The actuation device according to any one of claims 1 to 4, characterized in that the number of the tongues (411) of each set of locking elements (410) is a plurality, the plurality of tongues (411) being arranged at intervals along the circumference of the piston (200).
  6. 6. The actuating device of any of claims 1-4, wherein, in the axial direction, the cylinder (100) comprises a first end (120) and a second end (130), the piston (200) is in a retracted position when the movable assembly (310) is adjacent to the first end (120), the bolt (411) adjacent to the first end (120) is engaged with the cylinder (100) adjacent to the first end (120), the piston (200) is in an extended position when the movable assembly (310) is adjacent to the second end (130), the bolt (411) adjacent to the second end (130) is engaged with the cylinder (100) adjacent to the second end (130); The number of locking tongues (411) near the first end (120) is greater than the number of locking tongues (411) near the second end (130).
  7. 7. The actuation device according to claim 6, characterized in that the arc length of the locking tongue (411) near the first end (120) is greater than the arc length of the locking tongue (411) near the second end (130) in the circumferential direction of the piston (200).
  8. 8. The actuation device according to any one of claims 1 to 4, characterized in that the bolt (411) is provided with a first abutment surface (4113), the movable assembly (310) is provided with a second abutment surface (3111) and a third abutment surface (3112), the second abutment surface (3111) and the third abutment surface (3112) being arranged at a distance along the axial direction, the second abutment surface (3111) and the third abutment surface (3112) being intended to abut the first abutment surfaces (4113) of two sets of the locking assemblies (400), respectively, and the second abutment surface (3111) and the third abutment surface (3112) being configured to provide guiding of the bolt (411) in radial and axial movements.
  9. 9. The actuation device according to any one of claims 1 to 4, characterized in that the mobile assembly (310) comprises a sliding sleeve (311), the sliding sleeve (311) being provided with a second abutment surface (3111) and a third abutment surface (3112) for abutment with the lock tongue (411), the sliding sleeve (311) comprising: First limiting parts (3113), wherein the first limiting parts (3113) are two groups, the two groups of the first limiting parts (3113) are arranged at two ends of the second abutting surface (3111) and the third abutting surface (3112) along the axial direction at intervals, the first limiting parts (3113) are respectively configured to abut against the lock tongue (411) when the lock tongue (411) is separated from the cylinder (100) so as to limit radial displacement of the lock tongue (411), and And a second limiting portion (3114) disposed between the second abutting surface (3111) and the third abutting surface (3112), the diameter of the second limiting portion (3114) being larger than that of the first limiting portion (3113), the second limiting portion (3114) being configured to abut against the lock tongue (411) when the lock tongue (411) is engaged with the cylinder (100) so as to limit radial displacement of the lock tongue (411).
  10. 10. The actuator device of any one of claims 1-4, further comprising: -an unlocking mechanism (500), the unlocking mechanism (500) being configured to unlock a lock tongue (411) locked with the cylinder (100) when the piston (200) is in an extended position and a lock-up occurs, so as to move the piston (200) to a retracted position.

Description

Actuating device Technical Field The application relates to the technical field of electromechanical actuators, in particular to an actuating device. Background The reliability of the electromechanical actuator as a core component for converting electric energy into mechanical linear motion is directly related to the working performance and safety of the whole system. The actuating device serves as a core structure of the electromechanical actuator, and the piston of the actuating device can be reliably locked in a specific position to prevent accidental movement and to bear high loads or impact loads. In the related art, the steel ball is in clamping connection with the cylinder barrel sleeved outside the sliding sleeve by means of radial movement of the steel ball in the sliding sleeve, so that locking is realized. However, as the steel ball and the cylinder barrel are locked in a point contact mode, the contact area is small, the contact stress is easy to exceed the yield limit of the material under heavy load, so that plastic deformation occurs on the surfaces of the steel ball and the cylinder barrel, the bearing capacity of the point contact mode cannot be effectively improved by increasing the diameter of the steel ball or improving the hardness of the material, and the point contact mode is limited by the structural space and the brittleness of the material, so that the requirement of heavy load working conditions is difficult to meet. Disclosure of Invention In view of the above, it is necessary to provide an actuator device. An actuation device, comprising: a cylinder; A piston disposed in the cylinder; The locking assembly comprises two groups of locking pieces, the two groups of locking pieces are arranged at intervals along the axial direction, the locking pieces comprise lock bolts, and the lock bolts are arranged on the piston and are movably arranged along the radial direction of the piston; The transmission mechanism comprises a movable assembly, the movable assembly is sleeved in the piston, the movable assembly is configured to drive the piston to move between an extending position and a contracting position along the axial direction of the cylinder barrel, and drive the lock tongue to move along the radial direction of the piston, so that the lock tongue is clamped with or far away from the cylinder barrel to restrain or release the movement of the piston along the axial direction, and the lock tongue is at least in line contact with the cylinder barrel during the clamping. In one embodiment, the cylinder is provided with two limiting grooves, the two limiting grooves are arranged along the axial direction at intervals, the two limiting grooves are respectively used for being clamped with two groups of lock bolts, and the lock bolts comprise: The first curved surface is arranged at one end of the lock tongue, which is away from the axis of the piston, and is configured to be clamped with the limit groove, and on the section perpendicular to the axial direction, the first curved surface is arc-shaped, and the arc-shaped is correspondingly arranged with the limit groove, so that the first curved surface is in at least line contact with the limit groove. In one embodiment, on a section parallel to the axial direction and where the radius or diameter of the piston is located, the first curved surfaces are all arc-shaped, and the arc-shaped is arranged corresponding to the limit groove. In one embodiment, the locking bolt further comprises: The second curved surface is arc-shaped on a section perpendicular to the axial direction, the arc-shaped is correspondingly arranged on the outer circumferential surface of the movable assembly, and the second curved surface is configured to be in sliding fit with the outer circumferential surface of the movable assembly along the axial direction. In one embodiment, the locking pieces of each group are a plurality of locking bolts, and the plurality of locking bolts are arranged at intervals along the circumferential direction of the piston. In one embodiment, the cylinder barrel comprises a first end and a second end along the axial direction, when the movable assembly is close to the first end, the piston is located at a contracted position, the lock tongue close to the first end is clamped with the cylinder barrel close to the first end, when the movable assembly is close to the second end, the piston is located at an extended position, and the lock tongue close to the second end is clamped with the cylinder barrel close to the second end; The number of locking tabs proximate the first end is greater than the number of locking tabs proximate the second end. In one embodiment, the arc length of the locking bolt near the first end is greater than the arc length of the locking bolt near the second end along the circumference of the piston. In one embodiment, the lock tongue is provided with a first abutment surface, the movable assembly is provided with a