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54results about How to "Poor precision" patented technology

Method and apparatus for resetting valve lift for use in engine brake

A method and apparatus for resetting a valve lift for use in an engine brake. A brake piston (160), and a hydraulic fluid passage (214) are arranged within a rocker arm (210) or a valve bridge (400) of an engine. A resetting valve arranged between the rocker arm (210) and the valve bridge (400) is driven by a change in the distance between the rocker arm (210) and the valve bridge (400). When the valve lift of an engine exhaust valve (300) reaches a maximum, a reset fluid passage (219) is opened, the hydraulic pressure within the hydraulic fluid passage is released, the brake piston (160) is reversed by one interval, the motion transmission between a cam (230) and the engine exhaust valve (300) is partially disengaged, and the valve lift of the engine exhaust valve (300) is reduced. Also, during a returning process of the valve lift of the engine exhaust valve (300) after reaching the maximum position, repositioning of the reset valve is used to maintain a supply of pressure within the hydraulic fluid passage, the brake piston (160) is allowed to be positioned at an extended position, and the motion transmission between the cam (230) and the engine exhaust valve (300) is resumed. The apparatus for resetting the valve lift can be integrated within an engine exhaust valve brake, and is structurally simple, convenient to install and to adjust, thereby improving safety and reliability.
Owner:SHANGHAI UNIVERSOON AUTOPARTS CO LTD

Electromagnetic type pipeline welding aligning device and working method

The invention discloses an electromagnetic type pipeline welding aligning device and a working method. The method comprises the following steps that rough aligning is carried out on pipelines needingto be in butt joint; the aligning device is arranged at a connector of the pipelines, a line laser measuring instrument is aligned with a welding seam at the connector, and two laser displacement sensors are distributed on the two sides of the welding seam; a hydraulic cylinder is adjusted according to the diameter of the pipelines; the hydraulic cylinder drives a base plate, an adjusting column and an aligning device pressing plate to downwards extrude, and the pipelines are fixed; and after the pipelines are fixed, whether the centering effect and the width of the welding seam meet the needed standard or not is checked through the laser displacement sensors and the line laser measuring instrument. According to the electromagnetic type pipeline welding aligning device and the working method, the two laser displacement sensors are arranged on an annular holder in parallel, the coaxiality problem of the pipelines is detected through the distances between the sensors and the surfaces ofthe two pipelines, and if the two measured distances are the same or within the error range, centering is completed, the aligning precision is high, and operation is convenient.
Owner:HUBEI UNIV OF ARTS & SCI

Method and apparatus for resetting valve lift for use in engine brake

A method and apparatus for resetting a valve lift for use in an engine brake. A brake piston (160), and a hydraulic fluid passage (214) are arranged within a rocker arm (210) or a valve bridge (400) of an engine. A resetting valve arranged between the rocker arm (210) and the valve bridge (400) is driven by a change in the distance between the rocker arm (210) and the valve bridge (400). When the valve lift of an engine exhaust valve (300) reaches a maximum, a reset fluid passage (219) is opened, the hydraulic pressure within the hydraulic fluid passage is released, the brake piston (160) is reversed by one interval, the motion transmission between a cam (230) and the engine exhaust valve (300) is partially disengaged, and the valve lift of the engine exhaust valve (300) is reduced. Also, during a returning process of the valve lift of the engine exhaust valve (300) after reaching the maximum position, repositioning of the reset valve is used to maintain a supply of pressure within the hydraulic fluid passage, the brake piston (160) is allowed to be positioned at an extended position, and the motion transmission between the cam (230) and the engine exhaust valve (300) is resumed. The apparatus for resetting the valve lift can be integrated within an engine exhaust valve brake, and is structurally simple, convenient to install and to adjust, thereby improving safety and reliability.
Owner:SHANGHAI UNIVERSOON AUTOPARTS CO LTD
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