Roller screw drive linear actuator
A linear actuator, roller screw technology, applied in the direction of transmission, belt/chain/gear, mechanical equipment, etc., can solve the problem of difficult to meet the requirements of fast and high dynamic response of servo mechanism, limited motor output torque, torque-inertia Small ratio and other problems, to achieve the effect of simplified speed closed-loop and displacement closed-loop control, constant transmission ratio, and large torque-inertia ratio
Active Publication Date: 2013-05-08
BEIJING RES INST OF PRECISE MECHATRONICS CONTROLS +1
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Problems solved by technology
The electric servo system is easy to obtain energy, low cost, high reliability, and convenient to use and maintain. However, due to the limitation of the magnetic saturation and temperature rise of the motor, the output torque of the motor is limited, and its torque-inertia ratio is small, so it is difficult to meet the fast and high dynamic response of the servo mechanism. At the same time, in order to meet the requirements of output torque, the traditional structure generally adopts the scheme of motor and ball screw acceleration and deceleration device, and the deceleration device decelerates to increase the torque, which will cause the actuator to be too large and the power-to-mass ratio will be reduced
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[0012] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.
[0013] A linear actuator driven by a roller screw, its structure is as follows figure 1 As shown, the left end of the lead screw 1 is provided with a keyway 16 for connecting fixed moving parts, the middle and right parts of the lead screw 1 are provided with threads, and a stepped shaft is made after the threaded part is completed, and the lead screw gear 11 is installed on it. The indexing circle diameter of the bar gear 11 is consistent with the nominal diameter of the lead screw 1. A thread 13 is provided at the right end of the stepped shaft, and a lock nut 12 is arranged on the thread 13 at the right end of the stepped shaft. By tightening the lock nut 12, the lead screw gear 11 is fastened together with leading screw 1.
[0014] The front and rear two sections of each roller 6 are provided with positioning columns, and the inner sides of the pos...
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A roller screw drive linear actuator is characterized by comprising a screw (1), a screw gear (11), a roller (6), planet carriers (4 and 9), a nut (3), an external nut (7) and a lug (15). Pitch and number of internal thread of the nut (3) are equal to those of thread of the screw (1). Lead of the roller (6) is equal to that of the internal thread of the nut (3). The part of the internal thread of the external nut (7), meshing with the thread of the lug (15), is subjected to gear shaping for the left internal thread, and shaped teeth mesh with the external gear of the screw gear (11), while drive ratio of the shaped teeth is equal to that of the whole roller screw drive linear actuator. The roller screw drive linear actuator is simple in structure, stable in transmission, small in transmission clearance, high in transmission precision, low in noise, high in dynamic responsiveness and constant in transmission ratio and enables speed closed-loop control and displacement closed-loop control to be simpler.
Description
technical field [0001] The invention relates to the technical field of mechanical structures, in particular to a linear actuator driven by a roller screw. Background technique [0002] The electromechanical servo actuator system has been gradually used in various military and civilian industries such as aerospace, aviation, machine tool processing, etc. The electric servo system is easy to obtain energy, low cost, high reliability, and convenient to use and maintain. However, due to the limitation of the magnetic saturation and temperature rise of the motor, the output torque of the motor is limited, and its torque-inertia ratio is small, so it is difficult to meet the fast and high dynamic response of the servo mechanism. At the same time, in order to meet the output torque requirements, the traditional structure generally adopts the scheme of motor and ball screw acceleration and deceleration device, and the deceleration device decelerates to increase the torque, which wil...
Claims
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Login to View More IPC IPC(8): F16H37/02F16H25/22
Inventor 王惠娟徐强赵国平黄玉平刘亭陈俊杰
Owner BEIJING RES INST OF PRECISE MECHATRONICS CONTROLS