Space shafting variable preload mechanism based on SMA wire and spiral friction pair
A technology of space shafting and friction pairs, which is applied in the direction of mechanical equipment, transmission parts, belts/chains/gears, etc., can solve the problems of limited load changing capacity, inconvenient ground testing, and difficult processing, etc., to achieve strong driving ability, The effect of small additional mass and simple and compact structure
Active Publication Date: 2022-01-28
BEIHANG UNIV +1
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Problems solved by technology
[0004] The invention mainly solves the existing problems in the prior art, such as oversized size, complicated structure, difficult processing, limited load changing capacity, inconvenient ground testing, etc., and provides a simple and compact structure for the space shafting requirements. Space shaft system variable preload mechanism capable of multi-phase variable load, convenient for processing and ground testing
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[0030] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.
[0031] Such as figure 1 , 2 As shown, the present invention provides a space shaft system variable preload mechanism based on SMA and spiral friction pair, which includes: 1 pair of angular contact ball bearings 1, SMA wire 2, spiral rotor ring 3, spiral stator ring 4, plane Needle roller 5, bearing seat 6, bearing inner ring end cover 7, bearing outer ring end cover 8, bushing 9, corrugated spring sheet 10.
[0032] Among them, the two angular contact ball bearings 1 installed back to back, the inner ring part of which is supported on the shaft shoulder section of the bearing inner ring end cover 7, and the inner ring end cover 7 is connected to the servo motor to drive the inner ring in the setting It rotates at a high speed; the inner axial end surface of the inner ring is in contact with the bushing 9 to form a force transmission circuit; the oute...
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The invention provides a space shafting variable preload mechanism based on an SMA wire and a spiral friction pair. The space shafting variable preload mechanism comprises a pair of angular contact ball bearings, the SMA wire, a spiral rotor ring, a spiral stator ring, a needle roller thrust bearing, a bearing seat, a bearing inner ring end cover, a bearing outer ring end cover, a lining and a corrugated spring piece. The spiral rotor ring and the spiral stator ring are placed between the ball bearing outer rings, and the two ends of the SMA wire are connected to the outer surfaces of the two spiral rings and used for driving the spiral rotor ring to rotate. When the mechanism is assembled, due to the self-locking characteristic of the spiral contact surface, the mechanism can keep large preload in the shafting assembling stage; when the load of the mechanism is changed, the SMA wire drives the spiral rotor ring, so that the overall axial length is changed after the spiral rotor ring is matched with the spiral stator ring, and proper preload is provided for rotation of a shaft system. The space shafting variable preload mechanism designed by the invention is simple and compact, can change loads in multiple phases, is convenient to process and test on the ground, and meets the relevant technical requirements of a space shafting on a light and efficient driving mechanism.
Description
technical field [0001] The invention relates to the technical field of shafting preload adjustment mechanisms, in particular to a space shafting variable preload mechanism for multiphase preload adjustment. Background technique [0002] The space shaft system is an important part of the servo rotation aerospace products such as the solar panel drive mechanism, the control moment gyroscope, and the space control manipulator. This type of space electromechanical product requires a high rigidity of the shaft system during launch to resist the launch process. vibration and shock in the medium; and after launching into orbit, in order to ensure the rotation accuracy and life of the product, it is hoped that the shafting has a small frictional resistance torque and fluctuation to achieve high-precision servo control. The existing technical means is to preload the space shaft system so that it has enough rigidity to resist the dynamic load generated when the rocket is launched, but...
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Login to View More IPC IPC(8): F16H57/00F16H57/022
CPCF16H57/0025F16H57/022
Inventor 张小勇张宇航蒋俊张强张激扬周元子
Owner BEIHANG UNIV