9 results about "Overhead valve" patented technology

An overhead valve (OHV) internal combustion engine includes an engine block. Cylinder heads are mounted on the engine block. Intake and exhaust ports connect to intake and exhaust manifolds. Intake pushrod assemblies engage intake valve rocker arms and valve lifters. Exhaust pushrod assemblies engage exhaust valve rocker arms and exhaust valve lifters. One of the intake and exhaust pushrod assemblies is a jointed pushrod assembly. The jointed pushrod assembly includes an upper pushrod segment that engages one of the intake and exhaust valve rocker arms. A lower pushrod segment engages one of the respective intake and exhaust valve lifters. Complementary joint members pivotally engage each other and can include an angle of less than 180 degrees. At least one pushrod guide assembly is mounted on one of the engine block and each head, and defines at least one passage that guides the complementary joint members.

The utility model relates to the technical field of swimming pool filtration, in particular to a swimming pool filter overhead valve device which comprises a valve body, a water inlet pipe is fixedly connected to the upper right portion of the outer surface of the valve body, and a water outlet pipe is fixedly connected to the lower left portion of the outer surface of the valve body. The end, away from the valve body, of the water inlet pipe and the end, away from the valve body, of the water outlet pipe are both fixedly connected with connecting mechanisms, the outer surfaces of the two connecting mechanisms are both connected with positioning mechanisms in a clamped mode, the right end of the positioning mechanism on the right side is fixedly connected with a first connecting pipe, and the left end of the positioning mechanism on the left side is fixedly connected with a second connecting pipe. According to the overhead valve device of the swimming pool filter, the overhead valve device and an external connecting pipe are conveniently and rapidly connected and installed, the overhead valve device and the external connecting pipe are conveniently and rapidly disassembled to maintain, overhaul or replace the overhead valve device of the swimming pool filter or the connecting pipe, and when installation personnel install the overhead valve device, the installation and connection efficiency can be improved, and the connection and sealing performance can be improved.

The utility model provides an engine guiding scavenging valve mechanism which solves the problem that a traditional overhead valve type engine valve mechanism is difficult to efficiently sweep waste gas in a two-stroke working mode. According to the technical scheme, the air inlet valve air distribution assembly of the engine guiding scavenging air distribution machine comprises an air inlet valve rod arranged in an air inlet channel, the rear portion of the air inlet valve rod is connected with an air inlet valve cam and an air inlet valve spring pushing air inlet valve opening and closing air inlet, and an air guide pipe moving along with the air inlet valve rod is arranged between the air inlet valve rod and the air inlet valve head through a support. A front-end air outlet is reserved between the front end of the air guide pipe and the head of the air inlet valve, and a rear port of the air guide pipe is communicated with the air inlet channel. Waste gas is exhausted by guiding and scavenging the inlet gas, the two-stroke-type engine exhaust pipe can be suitable for a two-stroke-type working engine, the combustion efficiency and the emission performance are improved by guiding and scavenging the inlet gas, the scavenging efficiency is greatly improved, and then the working efficiency of the engine is improved.

The invention provides an engine guiding scavenging valve mechanism which solves the problem that a traditional overhead valve type engine valve mechanism is difficult to efficiently sweep waste gas in a two-stroke working mode. According to the technical scheme, the air inlet valve air distribution assembly of the engine guiding scavenging air distribution machine comprises an air inlet valve rod arranged in an air inlet channel, the rear portion of the air inlet valve rod is connected with an air inlet valve cam and an air inlet valve spring pushing air inlet valve opening and closing air inlet, and the air inlet valve rod is provided with an air guide pipe which moves along with the air inlet valve rod through a support sleeve and is close to the head of an air inlet valve. A front-end air outlet is reserved between the front end of the air guide pipe and the air inlet valve head, and a rear port of the air guide pipe communicates with the air inlet channel. By conducting guiding scavenging on inlet air and exhausting waste gas, the double-stroke-type engine can be suitable for a double-stroke-type working engine, an independent lubricating system is formed, a crankshaft rotates by a circle to complete one-time acting, by conducting guiding scavenging on the inlet air, the combustion efficiency and the emission performance are improved, the scavenging efficiency is greatly improved, and then the working efficiency of the engine is improved.

The present invention discloses a method for establishing a theoretical ventilation model for an overhead valve two-stroke aviation heavy fuel oil engine, comprising the following steps: establishing a NewBenson correction model; determining a mathematical model describing a scavenging phase based on the NewBenson correction model; determining a simulated change process of each stage and each zone of the simulated scavenging phase using calculation results of a three-dimensional simulation model; combining the mathematical model with a regression fitting method to obtain mathematical expressions for the model characteristic coefficients of the instantaneous air mixing ratio, the instantaneous exhaust gas mixing ratio, and the mixed gas exhaust rate; and combining the mathematical expressions for the model characteristic coefficients of the instantaneous air mixing ratio, the instantaneous exhaust gas mixing ratio, and the mixed gas exhaust rate into the mathematical model describing the scavenging phase to establish a theoretical ventilation model. The theoretical model obtained by the present invention has high prediction accuracy.

The present invention discloses a method for evaluating the compound supercharging matching of an aeroengine and optimizing the recovery of high-altitude performance, which comprises the following steps: establishing a first series arrangement simulation model and a second series arrangement simulation model; running the two simulation models, changing the altitude environment, and obtaining the specific values of multiple system performance evaluation indexes at different altitudes; establishing multiple fuzzy evaluation membership functions, and substituting the specific values into the fuzzy evaluation membership functions correspondingly to obtain the membership function values; establishing a performance fuzzy evaluation matrix, assigning certain weights to the system performance evaluation indexes to obtain an evaluation matrix, and calculating to obtain the evaluation scores of the two simulation models; determining the optimal series arrangement simulation model according to the evaluation scores, and optimizing the high-altitude performance recovery parameters of the optimal series arrangement simulation model. The present invention makes up for the blank in the research on the supercharging matching evaluation of the overhead valve two-stroke aero piston engine under high-altitude conditions and the optimization of high-altitude performance recovery parameters.

The damper comprises a piston rod, an oil storage pipe and a working cylinder arranged in the oil storage pipe, a sealing piston connected with the end of the working cylinder in a sealing mode is arranged in the oil storage pipe, the piston rod is movably arranged in the working cylinder, and one end of the piston rod penetrates out of the sealing piston. A limiting piece for limiting the stroke of the piston rod is arranged on the side, close to the working cylinder, of the sealing piston. A first cavity is formed between the piston rod and the working cylinder, a second cavity is formed between the working cylinder and the oil storage pipe, and a damping channel is arranged between the first cavity and the second cavity and penetrates through the sealing piston. The top valve has the advantage of solving the problem that a damping hole is difficult to process on the top valve in the conventional damper. According to the overhead valve, the sealing function and the stroke control function of an existing overhead valve are separated, a damping channel is formed in the sealing piston more simply, the machining difficulty is greatly reduced, the material selection flexibility is higher, and the replacement and maintenance cost can be reduced after one component is damaged.

The utility model discloses a photovoltaic damper with a sealing structure in the field of photovoltaic dampers, which comprises an oil storage cylinder pipe, a working cylinder, a piston rod, a guide sleeve and a top valve, at least one outer oil seal ring is assembled outside the guide sleeve, a piston rod oil seal ring and a first Y-shaped oil seal ring are assembled inside the guide sleeve, an inner oil seal ring is assembled outside the top valve, and a second Y-shaped oil seal ring is assembled inside the inner oil seal ring. A step seal sealing ring and a second Y-shaped oil seal ring are assembled in the overhead valve, a traditional rotary oil seal is replaced with the combination of the step seal sealing ring and the second Y-shaped oil seal ring, the photovoltaic damper can bear the working pressure of 40 Mpa or above, the overhead valve adopts an aluminum part and is additionally provided with an oil drainage groove, leaked oil liquid is discharged to an outer cavity through the oil drainage groove, and therefore the photovoltaic damper can bear the working pressure of 40 Mpa or above. And the damping oil in the inner cavity is discharged to the outer cavity through the damping hole, and the flow velocity of the oil is limited to generate damping force, so that the problem of oil leakage of a traditional photovoltaic damper is solved, and the service life of the photovoltaic damper is prolonged.

The present invention provides a valve train mechanism for an overhead valve-type engine provided with a highly versatile adjusting mechanism. Provided is the valve train mechanism (1) for an overhead valve-type engine, the valve train mechanism comprising: a push rod (4) that moves vertically with the rotation of a cam (2); a rocker arm (3) that is rotatably supported by being inserted into a shaft (3b), the rocker arm (3) being configured such that the vertical movement of the push rod (4) is transmitted to one end (3d) and the rocker arm (3) reciprocally oscillates to open and close an engine valve (5) at the other end (3a); a lash adjuster (10) that is swingably supported on a recess (3e) provided at the one end (3d) of the rocker arm (3) and transmits the vertical motion of the push rod (4) to the one end (3d) of the rocker arm; and an adapter (30) that is attached to the lash adjuster (10) and is interposed between the lash adjuster (10) and the push rod (4), wherein the adapter (30) is attached to and integrated with a sliding part (14) of the lash adjuster (10) at an upper part, and is supported at a lower part (31) by an upper end part (31) of the push rod, and the lash adjuster (10) transmits the vertical motion of the push rod (4) to the rocker arm (3) via an adapter (30) and adjusts the valve clearance.