Please select the most similar patent number from A, B, C and D. Which number is?
A variable-output cam lever power device, comprising: a housing (1); a motor (2), the motor (2) having a rotating shaft (21); a cam (3), the cam (3) being mounted on the rotating shaft (21) in a detachable and replaceable manner, and a front end face of the cam (3) being provided with a cam track sliding groove (31); an output shaft (4), a linkage rod (5) being fixed at a rear end of the output shaft (4); a lever (6), a front end of the lever (6) being provided in a shaft hole (101) of the housing (1), a linkage plate (61) being formed in the middle of the lever (6), the linkage plate (61) being connected to the linkage rod (5), and a rear end of the lever (6) being provided in the cam track sliding groove (31) of the cam (3).
A: Disclosed is a multi-station cam carrying mechanism, comprising a baseplate (1), a rotary shaft (2) arranged in the middle of the baseplate (1), an electric motor (3) in driving connection with the bottom of the rotary shaft (2), a rotary plate (4) arranged at an upper part of the rotary shaft (2), mounting frames (5) arranged on the baseplate (1), a mounting plate (6) arranged on the mounting frames (5), an annular sliding groove (7) provided on a bottom face of the mounting plate (6) along a cam trajectory, and a plurality of grabbing and transferring assemblies (8) annularly and uniformly arranged at intervals, with bottom parts thereof being slidably arranged on the rotary plate (4) and top parts thereof being slidably arranged in the sliding groove (7). The electric motor (3) drives a plurality of stations to carry products simultaneously, while the grabbing and transferring assemblies (8) perform a reciprocating movement along the cam trajectory, grabhooks (84) on the grabbing and transferring assemblies (8) perform a vertical reciprocating movement so as to grab and transfer the products, so that the products are sequentially transferred from one station to the next station. The present invention has a compact structure, reduces the size of an apparatus, improves the transferring efficiency, works stably and has a good effect when in use.
B: A damper, and laundry machine using same. The damper comprises a rotating shaft (3), a cam mechanism (4), a buffer mechanism (5), and a stroke amplification mechanism (6). The rotating shaft (3) rotates about an axial direction. The buffer mechanism (5) provides a buffering force. The cam mechanism (4) is connected to the rotating shaft (3), and converts rotation with respect to the rotating shaft (3) into a linear reciprocating motion. The stroke amplification mechanism (6) is connected to the cam mechanism (4) and the buffer mechanism (5), and transmits and amplifies a small stroke of the cam mechanism (4) to provide a large stroke of the buffer mechanism (5). The stroke amplification mechanism (6) comprises a lever (61), and a fulcrum (613) divides the lever into a short arm (612) and a long arm (611). An end of the lever on the long arm (611) is connected to the buffer mechanism (5), and the end of the lever on the short arm (612) is connected to the cam mechanism (4). By employing the stroke amplification mechanism (6) to convert a small movement of the rotating shaft (3) into a large movement of the buffer mechanism (5), the present invention provides a design in which a small-angled rotation of the rotating shaft (3) can accurately provide a sufficient damping force, thus improving product safety, and providing superior user experience.
C: A continuously variable valve lift device for a piston internal combustion engine, comprising a cylinder head (1), a camshaft (2) rotatably supported by the cylinder head (1), a cam (3) axially fixed to the camshaft (2), a hydraulic tappet (4), and a valve (5), further comprising a lever (6), an adjusting lever (7), an adjusting shaft (8), a guide shaft (9), a guide frame (10), and a return spring (11); a large arc face (61) is provided at one side face of the lever (6); one end portion of the adjusting lever (7) is in sliding contact with the large arc face (61) of the lever (6), and the other end of the adjusting lever (7) is connected to the adjusting shaft (8); the adjusting shaft (8) is rotatably supported by the cylinder head (1), and the adjusting shaft (8) can rotate and drive the adjusting lever (7) to swing, so that one end portion of the adjusting lever (7) moves in a circumferential direction along the large arc face (61); and one end of the lever (6) is in contact with or in indirect contact with the valve (5), the other end of the lever (6) is in contact with or in indirect contact with the cam (3), and both the valve (5) and the cam (3) are located on a side, opposite the large arc face (61), of the lever (6). Said device not only implements continuous variation of the valve lift, but also enables the valve lift to become zero.
D: A speed changing device (1) comprises an outer-ring component (2), a mandrel (3), a plurality of cam components (5), and a plurality of inner gears (6). At least one outer gear (21) is comprised inside the outer-ring component (2). The mandrel (3) and the at least one inner gear (21) are coaxially and pivotally disposed on the outer-ring component (2). The mandrel (3) is provided with a central axis (30) and a plurality of cam junction portions (31) is disposed on the periphery of the mandrel (3). The plurality of cam components (5) is detachably sleeved on the plurality of cam junction portions (31), synchronously rotates along with the mandrel (3), and at least two of the plurality of cam components (5) has an angle phase difference that is not zero. The plurality of inner gears (6) is made of a rigid material, and is separately sleeved on the plurality of cam components (5) and does not move along with the plurality of cam components (5). The plurality of inner gears (6) engages with part of the at least one outer gear (21).
Answer: D