Please select the most similar patent number from A, B, C and D. Which number is?
Disclosed are a nut and lead screw type opening and closing mechanism for an automatic door, an automatic vehicle door, and a vehicle. The nut and lead screw type opening and closing mechanism for an automatic door comprises a driving device (10), a lead screw (20), a nut push block (30), and a push rod (40), wherein the driving device (10) is fixedly connected to a vehicle door (100), the lead screw (20) is rotatably mounted on the vehicle door (100), the nut push block (30) is sheathed on the lead screw (20), a first end of the push rod (40) is hinged to the nut push block (30), a second end of the push rod (40) is hinged to a vehicle body (200), and the driving device (10) drives the lead screw (20) to rotate so as to enable the nut push block (30) and the push rod (40) to move in a reciprocating linear manner along the lead screw (20), so that the push rod (40) drives the vehicle door (100) to open or close relative to the vehicle body (200).
A: Provided is a deforming aircraft (100), comprising a fuselage (20) and a frame (30) connected onto the fuselage; the fuselage (20) comprises a drive mechanism (26); the frame (30) comprises a main support arm (31), a crossbar (33), and a helical power mechanism (34); the main support arm (31) is connected to the drive mechanism (26) of the fuselage (20); the crossbar (33) is connected to the main support arm (31); the helical power mechanism (34) is mounted on the crossbar (33); the drive mechanism (26) comprises a leadscrew (261), at least two nuts (262, 263) screwed onto the leadscrew (261), and a nut adapter (265) sleeved on one of said nuts; the at least two nuts (262, 263) are connected to each other; the main support arm (31) is connected to the nut adapter (265); thus the overall dynamic stiffness is increased, the dynamic stiffness of the deforming aircraft during both deformation and flight is satisfactory, flight performance is improved, and costs are reduced.
B: Disclosed are an axial drive mechanism and an electromechanical device. The axial drive mechanism comprises a drive motor, a ballscrew mechanism, and a loading component. The drive motor comprises a motor shaft extending along a first direction. The ballscrew mechanism comprises a screw extending along the first direction, and a nut sleeved on the screw. The loading component is movably arranged along the first direction. One of the screw and the nut is disposed on the motor shaft to rotate with the motor shaft, and the other is fixedly connected to the loading component to drive the loading component to move along the first direction. On the one hand, the axial drive mechanism provided by the present invention can reduce the size of space occupied by the axial drive mechanism, which facilitates achieving the miniaturization of the axial drive mechanism; on the other hand, the axial drive mechanism can reduce the inertia of the axial drive mechanism to improve the driving accuracy.
C: Provided are an automobile side door electric opening and closing device and an automobile, the opening and closing device comprises a gear box (1), a lead screw (2), a nut (3) and a driving unit (4), the driving unit (4) is connected with the gear box (1), the periphery of the lead screw (2) is sleeved with the nut (3), one end of the lead screw (2) is fixedly connected with a vehicle body, the other end of the lead screw (2) penetrates through the gear box (1), and the nut (3) on the periphery of the lead screw (2) is located in the gear box (1); a gear transmission mechanism is arranged in the gear box (1), the driving unit (4) is connected with the nut (3) through the gear transmission mechanism; the gear box (1) and the driving unit (4) are both installed in a vehicle door; the driving unit (4) drives the nut (3) to rotate through the gear transmission mechanism so as to drive the lead screw (2) to do front-back reciprocating motion, and electric opening or closing of the automobile side door is achieved.
D: A linkage swing head structure, comprising: a base (1), a driving mechanism (2), and a main shaft (3). The driving mechanism (2) comprises: a power mechanism (2-1), a connecting rod mechanism (2-2), and a lead screw (2-3); a cutter (7) is fixed at one end of the main shaft (3), and the main shaft (3) is fixed at one end of the connecting rod mechanism (2-2); the end of the connecting rod mechanism (2-2) at which the main shaft (3) is fixed is sleeved on a support bearing (4); the connecting rod mechanism (2-2) can rotate around the support bearing (4); the support bearing (4) is fixed on the base (1); the other end of the connecting rod mechanism (2-2) is movably connected to the lead screw (2-3); an output end of the power mechanism (2-1) is connected to one end of the lead screw (2-3); the connecting rod mechanism (2-2) adjusts an rotation angle of the main shaft (3) by sliding on the lead screw (2-3). The driving mechanism is distant from the main shaft and has a small interference range to the main shaft; the main shaft can realize automatic continuous division and can also perform linkage machining of small cutting amount, and when the cutter rotates by the same angle, the size of the device is reduced; the structure is simple and manufacturing costs are low.
Answer: C