69results about How to "Smooth oil return" patented technology

In order to provide an oil ring that is for an internal combustion engine, stably obtains over the long term the ability to scrape away excess oil from the inner walls of cylinders, allowing the oil to flow down the rear surface of pistons, and can reliably reduce the amount of oil consumption during driving of the internal combustion engine, an oil ring for an internal combustion engine is used wherein: an oil ring body is provided with a coil-expander-accommodating indentation that runs along the inner peripheral surface thereof and of which the cross section in the axial direction of the oil ring is roughly semicircular; furthermore, at the inner peripheral surface of said coil-expander-accommodating indentation, an oil-returning groove is formed that is along the inner peripheral surface thereof and that smoothly returns scraped-off oil to the rear surface of the piston; and in said oil-returning groove, in a cross-section in the axial direction of the oil ring, the outer peripheral shape thereof is configured from lines and curves that connect said lines.

The invention discloses a magnesium alloy plate type heat exchanger and a processing molding method thereof. The plate type heat exchanger comprises a snakelike flow channel type and honeycomb flow channel type evaporation plate or a cold plate. The plate type heat exchanger adopts a high strength magnesium alloy plate and consists of a magnesium alloy upper plate, a magnesium alloy lower plate, an inlet pipe and an outlet pipe, wherein the two magnesium alloy plates are overlapped and welded together by a solid-phase stir friction connecting method; the inlet pipe and the outlet pipe are inserted in the upper end and the lower end between the two high strength magnesium alloy plates and are connected with the high strength magnesium alloy plate type heat exchanger body by using an electric arc welding method; and then the plate type heat exchanger is finally molded through a mould and high-pressure bulging technology.

The invention discloses a hydraulic system for telescopic buffer of a crane boom and a crane. The hydraulic system for telescopic buffer of the crane boom comprises a telescopic oil cylinder, a main valve and a balance valve, wherein a first working oil port and a second working oil port of the main valve are respectively connected to a rod chamber of the telescopic oil cylinder and a free oil inlet of the balance valve in a communication way, a free oil outlet of the balance valve is connected to a rodless chamber of the telescopic oil cylinder in a communication way, and the first working oil port is also connected to a control oil port of the balance valve in a communication way through a control oil line; and the hydraulic system for telescopic buffer of the crane boom also comprises an auxiliary pressure-relief oil line, a through flow damper and a hydraulic control pressure-relief on-off valve, wherein the oil inlet end of the auxiliary pressure-relief oil line is connected to the rodless chamber of the telescopic oil cylinder in a communication way, the through flow damper and the hydraulic control pressure-relief on-off valve are arranged on the auxiliary pressure-relief oil line, and the control oil port of the hydraulic control pressure-relief on-off valve is connected to the control oil line or the first working oil port in a communication way. By implementing the hydraulic system, impact generated by the balance valve or a pressure shunting damper when the crane boom is started to be shrunk can be effectively reduced.