US 12,331,813 B2
Multistage electric cylinders
Ji Guo, Langfang (CN); and Ziming Meng, Langfang (CN)
Assigned to LIM-TEC (LANGFANG) TRANSMISSION EQUIPMENT CO., LTD., Langfang (CN)
Filed by LIM-TEC (LANGFANG) TRANSMISSION EQUIPMENT CO., LTD., Hebei (CN)
Filed on Aug. 24, 2023, as Appl. No. 18/455,581.
Application 18/455,581 is a continuation of application No. 18/451,823, filed on Aug. 17, 2023.
Claims priority of application No. 202310308909.2 (CN), filed on Mar. 28, 2023; application No. 202320629026.7 (CN), filed on Mar. 28, 2023; application No. 202310314726.1 (CN), filed on Mar. 29, 2023; application No. 202310314728.0 (CN), filed on Mar. 29, 2023; application No. 202320642784.2 (CN), filed on Mar. 29, 2023; and application No. 202320642792.7 (CN), filed on Mar. 29, 2023.
Prior Publication US 2024/0328488 A1, Oct. 3, 2024
Int. Cl. F16H 25/20 (2006.01); H02K 7/06 (2006.01); H02K 7/116 (2006.01)
CPC F16H 25/20 (2013.01) [H02K 7/06 (2013.01); H02K 7/116 (2013.01); F16H 2025/204 (2013.01); F16H 2025/2081 (2013.01)] 15 Claims
OG exemplary drawing
 
1. A multistage electric cylinder, comprising:
a cylinder barrel;
a motion component includes a first screw rod, a second screw rod, a screw rod nut, a first protective tube, a second protective tube, and a first screw rod guide support seat;
an immovable tube;
wherein:
the first screw rod has external threads, the second screw rod has a hollow structure and internal threads, the second screw rod is matched on the first screw rod through the internal threads of the second screw rod so that the second screw rod is sleeved on the first screw rod;
the screw rod nut is installed on the second screw rod;
the immovable tube is coaxially and fixedly hollow-set on an outer side of the screw rod nut;
the first protective tube is coaxially fitted on an outer side of the immovable tube and moves along an axial direction of the immovable tube;
the second protective tube is coaxially fitted on an outer side of the first protective tube and moves along an axial direction of the first protective tube, wherein
an outer wall of the first protective tube is axially provided with a third guiding groove; the second protective tube is fixedly provided with a second anti-rotation pin, which moves axially along the third guiding groove, and
two ends of the second guiding groove and the third guiding groove respectively have limiting portions;
the first screw rod guide support seat is fixedly mounted on the first screw rod; and
when the first screw rod is driven to rotate, the first screw rod drives the second screw rod in a straight line motion along an axis of the cylinder barrel with cooperation with the external threads of the first screw rod and the internal threads of the second screw rod until an end of the internal threads of the second screw rod resists against the first screw rod guide support seat;
after the end of the internal threads of the second screw rod resists against the first screw rod guide support seat, the second screw rod follows the first screw rod in rotation, and with the cooperation of the external threads of the second screw rod with internal threads of the screw crew rod nut, the second screw rod drives the screw rod nut in a straight line motion along the axis of the cylinder barrel.