US 12,281,692 B2
Electric cylinders with buffering devices
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. 17, 2023, as Appl. No. 18/451,823.
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 2024/0328489 A1, Oct. 3, 2024
Int. Cl. F16H 25/24 (2006.01); F16H 25/20 (2006.01); H02K 7/06 (2006.01); H02K 7/116 (2006.01)
CPC F16H 25/24 (2013.01) [F16H 25/20 (2013.01); F16H 25/2015 (2013.01); H02K 7/06 (2013.01); H02K 7/116 (2013.01); F16H 2025/2031 (2013.01); F16H 2025/2081 (2013.01)] 17 Claims
OG exemplary drawing
 
1. An electric cylinder, comprising:
a cylinder barrel;
a linear motion component, a load end of the linear motion component being connected to a load, and a power end of the linear motion component being connected to a power source, wherein the linear motion component includes:
a push rod, the push rod being axially movably provided within the cylinder barrel; and
a screw rod, the screw rod being provided within the push rod;
a buffering device, the buffering device being located at at least one of the load end of the linear motion component or the power end of the linear motion component, so as to provide buffering for the at least one of the load end or the power end, wherein the buffering device includes a first buffering spring set and a second buffering spring set;
a front-end cover, the front-end cover being fixed to one end of the cylinder barrel;
a push rod guide bearing, the push rod guide bearing being fixed in the front-end cover and fitted on an outer side of the push rod, wherein the push rod guide bearing is configured to guide the push rod;
a dust seal, the dust seal being fixed in the front-end cover and fitted on the outer side of the push rod;
a watertight seal, the watertight seal being fixed in the front-end cover and fitted on the outer side of the push rod;
a first guiding groove, the first guiding groove being provided in the cylinder barrel along an axial direction of the cylinder barrel;
a stop-rotation key, the stop-rotation key being fixed on an outer side of one end of the push rod, axially movably engaging with the first guiding groove, and restricting a rotational movement of the push rod allowing only a linear motion;
a recess, the recess being provided axially on an inner side of a holding cavity of the push rod;
an inner stop-rotation key, the inner stop-rotation key being fixed on a nut and axially movably engaging with the recess for preventing the nut from rotating;
a sensor system, the sensor system comprising a radial force sensor configured to measure radial forces and an impact load sensor configured to measure impact load; wherein the radial force sensor is provided circumferentially along the linear motion component, and the impact load sensor is provided inside a front-end joint; and
a processor, the processor communicating with the sensor system and a motor of the electric cylinder and being configured to control an alarm device to send a warning and control operation of the motor when the radial forces or the impact load exceeding a load based on data of the radial force sensor and the impact load sensor.