33 results about "Engine valve" patented technology

This invention provides an engine valve and a method for manufacturing the same, which can suppress galvanic corrosion even when dissimilar metals are joined, and which exhibits excellent wear resistance and corrosion resistance, for use in engines that use CNG, LPG, or alcohol as fuel. [Solution] The engine valve 10 of the present invention is a joint member in which a shaft portion 14 made of martensitic heat-resistant steel SUH11 and a umbrella portion 12 made of austenitic heat-resistant steel SUH35 are joined. A nitride layer is formed only on the surface of the base material on the shaft portion 14 side from the joint portion 13 between the shaft portion 14 and the umbrella portion 12, leaving the surface of the base material exposed on the umbrella portion 12 side from the joint portion 13.

A piston positioning mechanism includes a resilient retainer disposed in an annular groove on the outside of the piston, the resilient retainer engaging the wall of the bore of the piston to create a resistance to movement of the piston within the bore, the resistance to movement maintaining the piston in a retracted position within the bore, the retracted position being one in which the piston is clear of the engine valves. The embodiment eliminates the need for a conventional piston return spring, reduces the height of the piston mechanism, and reduces the opening oil pressure of the piston.

The utility model provides automatic installation device of engine valve, including valve feeding mechanism, adjusting mechanism and clamping mechanism. The device transports corresponding valve respectively through first conveyer and second conveyer who sets side by side, and places valve on first table board and second table board, to position and guide the transport of valve, and the second mechanical arm can simultaneously snatch the air inlet valve and the exhaust valve by taking and placing mechanism, and can snatch corresponding valve alone, and the cylinder cover is adjusted by the cooperation of lifting assembly and clamping turnover assembly, to control the installation position of the well adjusted cylinder cover, and the second mechanical arm is convenient for snatching valve and is installed fast, realizes the automation assembly of two kinds of valves.

A hollow engine valve 100 having a shaft portion 111 and a petal portion 113 which is expanded in diameter in an umbrella shape at a base end of the shaft portion 111, into which a cooling material is enclosed in a hollow portion 115 provided at least in the inside of the shaft portion 111, wherein the shaft portion 111 has a first shaft portion 111a on a tip end side, a second shaft portion 111b on a base end side which is larger in outer diameter than the first shaft portion 111a, and a step portion 111c which is formed by the difference in outer diameter between the first shaft portion 111a and the second shaft portion 111b, and the wall thickness t2 of the step portion 111c is thicker than the wall thickness t1 of the second shaft portion 111b.

The utility model discloses an engine valve clearance combination tool belongs to frock technical field, solved the traditional method to rely on operator's experience and hand feeling, and the adjustment precision is difficult to guarantee and the operation complex and time -consuming problem. The engine valve clearance combination tool, including adjusting handle, adjusting wrench, both ends of adjusting handle are equipped with adjusting screw rod, the adjusting screw rod with adjusting handle between being equipped with conical body, the outer wall surface of adjusting handle both ends is hexagonal structure, adjusting wrench including ratchet sleeve, torque wrench, the detachable of ratchet sleeve installs one end at torque wrench, the upper portion of ratchet sleeve inner wall is equipped with with hexagonal structure's inner hexagonal structure, the lower portion of ratchet sleeve inner wall is equipped with with the outer wall surface of conical body's conical surface. The utility model discloses an engine valve clearance combination tool, effectively improves work efficiency and adjustment precision.

The application discloses a variable-lift valve structure and a lift control method, and is applied to the field of engine valve control. The variable-lift valve structure comprises a base, a follower and a cam group, one end of the base is movably connected with the follower, the other end of the base is movably connected with the cam group, the base selectively transmits extrusion force of the cam group to the follower, and the follower is connected with a valve. The application comprises two states, in the first state, the base is connected with the follower, and the cam group transmits the extrusion force to the follower; and in the second state, the base is separated from the follower. The application has the advantages of simple structure, saving of limited layout space of an engine, convenience for wide range popularization, provision of different air intake and exhaust amounts at different speeds, and good adjustment of lift effect.

The application provides an engine valve train detection method, a hydraulic tappet device and electronic equipment. The method comprises the following steps: collecting a first torque set of a flywheel end of an engine when a hydraulic tappet is installed in the valve train of the engine, wherein the first torque set comprises torques collected under multiple engine operating conditions; collecting a second torque set of the flywheel end of the engine when a hydraulic tappet device is installed in the valve train of the engine after the hydraulic tappet is removed, wherein the valve train of the engine stops running after the hydraulic tappet is removed, the hydraulic tappet device is used to block an oil passage hole of a cylinder head oil passage of the engine, and the second torque set comprises torques collected under multiple engine operating conditions; and obtaining a detection result representing friction loss of the valve train of the engine according to a difference between torques under the same engine operating condition in the first torque set and the second torque set. Thus, the problem that the friction loss of the valve train of an entity cannot be detected can be solved.

An engine rocker arm includes a piston bore and a hydraulic drive mechanism, the hydraulic drive mechanism including a hydraulic piston, an oil valve mechanism, and an oil unloading mechanism, the hydraulic piston disposed in and movable within the piston bore, the engine rocker arm selectively transmitting motion of an engine cam to an engine valve at a location of the piston bore via the hydraulic piston; the hydraulic piston having an oil valve mechanism and an oil passage disposed therein, the oil passage disposed below the oil valve mechanism, an upper side of the oil valve mechanism being a high pressure oil chamber, the oil valve mechanism controlling flow of oil between the oil passage and the high pressure oil chamber; the oil unloading mechanism disposed within the hydraulic piston and below the oil valve mechanism, the oil unloading mechanism configured to unload oil from the high pressure oil chamber.

An engine valve actuation system (20) includes a rotatable camshaft (22) having a cam lobe (23), and a lifter assembly (24) having a lifter arm (26) with a roller (34) in contact with the cam lobe (23). A bushing (54) is positioned in a pin bore (50) of the lifter arm (26) and journals the lifter arm (26) on a pin (52) for reciprocating motion in response to rotation of the camshaft (22). An oil inlet passage (58) extends to the pin bore (50), and an oil outlet passage (64) extends from the pin bore (50). The oil outlet passage (64) forms an oil jet port (68) defining an oil jet path (70) oriented for directing an oil jet at the roller (34) and / or the cam lobe (23). An oil supply groove (72) is formed in at least one of the lifter arm (26) or the bushing (54) and fluidly connects the oil inlet passage (58) to the oil outlet passage (64).

An engine valve actuation system includes a rotatable camshaft, a first valve lifter, and a second valve lifter configured to actuate a valve in an engine in response to rotation of a cam of the camshaft. The engine valve actuation system includes an anti-rotation device having a collar having a sleeve portion and a boss portion, and a bridge connector configured to couple with one of the valve lifters. The other of the valve lifters is slidably received in the sleeve portion. The anti-rotation device reciprocates with the one of the valve lifters and limits rotation of each of the valve lifters during use.

A kind of engine cylinder cover valve opening and closing time relative crank angle measurement system belongs to engine detection technical field.Sensor fixed tooling has installation hole one, installation hole two, installation hole three, threaded hole one, threaded hole two, threaded hole three, tooling fixed hole one, tooling fixed hole two and tooling fixed hole three, installation hole one is installed into air inlet displacement sensor, installation hole two is installed into exhaust displacement sensor, installation hole three is installed into piston top dead center displacement sensor, incremental encoder is connected with engine pulley, air inlet displacement sensor, exhaust displacement sensor, piston top dead center displacement sensor signal is accessed PLC controller, incremental encoder output signal is accessed PLC controller, PLC controller passes data to host computer measurement system.The utility model is in cooperation with the design of each component, high-precision, automatic measurement to engine valve opening and closing time relative crank angle is realized, and it is convenient for data management and analysis, provides effective support for engine test.

The variable duration valve train controls the flow of air into the combustion chambers of the combustion engine. The variable duration valve train includes a drive cylinder structure, a stroke limit cylinder structure, an engine valve structure, a plurality of cams, and a working fluid. The engine valve structure attaches to the drive cylinder structure. The stroke limit cylinder structure forms a fluidic connection with the drive cylinder structure. The working fluid fills the stroke limit cylinder structure and the drive cylinder structure. The plurality of cams form mechanical linkages with the drive cylinder structure and the stroke limit cylinder structure. The working fluid and the plurality of cams limit the range of motion of the engine valve structure.

An engine rocker arm includes a piston bore and a hydraulic drive mechanism. The hydraulic drive mechanism includes a hydraulic piston and a positioning element. The hydraulic piston is disposed in the piston bore and is movable within the piston bore. The positioning element includes a locking rod connected to the engine rocker arm and a positioning head disposed on the locking rod. The upper part of the hydraulic piston is provided with a limiting groove. The top end of the limiting groove contracts inward to form a slot at the top end of the hydraulic piston. The locking rod passes through the slot. The positioning head is disposed and confined within the limiting groove. The hydraulic piston and the positioning head move in coordination to control the stroke of the hydraulic piston within the piston bore. The engine rocker arm selectively transmits the motion of the engine camshaft to the engine valves through the position of the hydraulic piston in the piston bore.

A valvetrain system may include a rocker arm assembly actuatable between a drive mode defining a drive valve lift profile of an engine valve, and a cylinder deactivation mode defining a recharge valve lift profile of the engine valve. The recharge valve lift profile begins after the drive valve lift profile. The recharge valve lift profile defines a recharge lift amplitude that is less than a drive lift amplitude. The recharge valve lift profile ends within 15% of an end of the drive valve lift profile. The recharge valve lift profile is defined entirely within the drive valve lift profile so that: when the rocker arm assembly is in the drive mode, movement of the engine valve is dictated by the drive valve lift profile, and when the rocker arm assembly is in the cylinder deactivation mode, movement of the engine valve is dictated by the recharge valve lift profile.

This utility model discloses a rocker arm mechanism and an engine valve train, relating to the field of engine technology. The rocker arm mechanism includes a connecting shaft, an exhaust rocker arm assembly, and a braking rocker arm assembly. A first seal is disposed in a first cavity, one end of which is connected to a first elastic element, and the other end is connected to a first limiting unit. A first piston is slidably disposed in a second cavity. The braking rocker arm is arranged side-by-side with the exhaust rocker arm and sleeved outside the connecting shaft. A second seal is disposed in a third cavity, one end of which is connected to a second elastic element, and the other end is connected to a second limiting unit. A second piston is slidably disposed in a fourth cavity. The rocker arm mechanism provided by this utility model can quickly switch between HLA rocker arm function and braking rocker arm function, automatically eliminating valve clearance on the one hand and automatically adjusting clearance increased due to wear on the other, offering diverse functions to meet user needs.

A valve train system can include a rocker arm assembly that can be actuated between a drive mode, which defines a drive valve lift profile of an engine valve, and a cylinder deactivation mode, which defines a recharge valve lift profile of the engine valve. The recharge valve lift profile begins after the drive valve lift profile. The recharge valve lift profile defines a recharge lift amplitude that is smaller than a drive valve lift amplitude. The recharge valve lift profile ends within 15% of the end of the drive valve lift profile. The recharge valve lift profile is completely defined within the drive valve lift profile, such that: when the rocker arm assembly is in drive mode, the movement of the engine valve is determined by the drive valve lift profile, and when the rocker arm assembly is in cylinder deactivation mode, the movement of the engine valve is determined by the recharge valve lift profile.

This utility model relates to a conveying mechanism for an engine valve spring production line, including a platform with a first conveying device and a pushing mechanism on the right side of the platform. This conveying mechanism, through the pushing mechanism, ensures that when engine valve springs are conveyed by the first conveying device and fall onto the drive box, they scatter horizontally. Then, a first hydraulic pushing device pushes these horizontally scattered engine valve springs onto a material conveying box. A material conveying trough then allows the valve springs pushed onto the material conveying box to fall one by one into a storage box on a second conveying device. Finally, a second hydraulic push-pull device effectively unclogs the material conveying trough and, by controlling its extension and retraction, slows down the discharge speed of the valve springs. Therefore, this mechanism is highly practical.

Valve for an aircraft turbomachine, including a seat defining an air inlet, a shutter movable relative to the seat between a closed position in which the shutter at least partly closes the air inlet, and an open position in which the shutter closes the air inlet less than in the closed position, a frame fixed relative to the seat, the frame defining a housing and a recovery chamber in communication with each other, and a plug located in the housing, the plug being fusible and configured, in the solid state, to hold the shutter in a first position among the closed position and the open position, and in the molten state, flow towards the recovery chamber.

The application provides a design method of a direct / air combined aircraft control system based on DDPG, and belongs to the technical field of aerospace, and comprises the following steps: obtaining a mathematical model of a related system of a track control engine according to a mapping relationship between a constant flow track control engine valve opening and a track control direct force thrust size, designing a track control overload instruction tracking subsystem based on a classical control method; establishing a dynamics equation of a direct / air combined control system, and deriving a short-period missile body transfer function considering side jet interference; combining an actuator and constraint conditions of each state variable, designing an attitude stabilizing subsystem based on a DDPG method, and completing the design of the control system. The method introduces DDPG reinforcement learning, considers several couplings and interferences including side jet interference and track control engine installation errors, and well handles the couplings and interferences.

The application discloses a kind of detection methods of engine valve lock block missing loading, it is related to engine assembly detection technical field, including using the inherent gap between two valve lock pieces when normal assembly as fixed leakage passage, by machine tool drive semi-automatic plugging down, plugging rubber ring and valve spring seat are adhered to form detection cavity.By test leakage machine to detection cavity inflation, according to the leakage cross-sectional area and height of normal assembly deduce maximum legal loss boundary, set as leakage upper limit.Inflation pressure monitoring after stabilization, when actual leakage exceeds leakage upper limit, it is judged that there is missing loading defect and NG signal is output, and other cylinders are tested for leakage in turn, and data is synchronously interacted to system.The present application overcomes the limitation of traditional differential pressure leakage relying on completely closed cavity, directly identifies missing loading defect by capturing the pressure drop difference caused by component loss, and realizes automatic quality interception.

A hydrogen combustion engine comprises a combustion chamber comprises with cylinder head having at least one valve, said at least one valve comprising a valve disc for closing the combustion chamber from a manifold area and a valve stem coupled to an actuator system provided on the cylinder head and guided through a valve guide of the cylinder head and through the manifold area towards a valve seat to actuate the valve disc. The valve guide comprises a first seal assembly facing the manifold area; and is dimensioned for allowing the valve stem to reciprocate while preventing lubricant entering the manifold area through said seal assembly. The valve guide is further fluidly connected to an oil return gallery via an oil outlet channel near the seal assembly.

An embodiment of the present invention provides a valve seat for an engine, which is in contact with a valve within a combustion chamber of the engine to perform a sealing function, wherein a stacked portion in which 40 to 100 wt% of a Co-based alloy and the remaining Fe-based alloy are mixed and stacked is provided on a contact surface of the valve seat that is in contact with the valve.

The application discloses a kind of direct force engine piston assembly device and use method, the device includes guiding tool, positioning tool and top pressure module.Positioning tool is the base of entire device, for positioning, clamping to valve body.Guiding tool is installed between valve body and piston, is used to support piston when assembling, piston is guided into valve body, is used to contract piston ring when top pressure.Top pressure module top pressure piston, complete piston and valve body assembly.The application solves the problem of difficult assembly and piston skewing deformation caused by the misalignment of force direction and valve body hole axis during the assembly of direct force engine valve body and piston, and improves the quality and consistency of assembly.

An engine rotating valve type rotary servo valve mechanism, including valve core (1), valve seat (2), inlet and outlet manifold (3), one-way diaphragm (18), one-way diaphragm (19), engine cylinder and servo rotary motor; The servo valve method of the engine rotating valve type servo valve mechanism is to use the servo rotary motor as the power to drive the valve core (1) to rotate inside the valve seat (3), and to use the rotary transformer to monitor and accurately control the rotary position of the inlet valve core (1) relative to the valve seat (3), to realize the opening and closing between the inlet and outlet grooves and the corresponding inlet and outlet ports, so as to realize the stop of the valve. The device has the advantages of compact structure, stable gas supply, convenient use and adjustment, etc., can effectively reduce the vibration of the engine due to the valve, improve the engine efficiency, and has good market prospect.

A valve actuation system comprises a first motion transfer mechanism operatively connected to a first valve actuation motion source providing at least main valve actuations to at least one intake engine valve. A second motion transfer mechanism is operatively connected to a second valve actuation motion source providing at least an LIVC and IEGR valve actuations. When a selectable coupling mechanism is operated in a first state, the main valve actuation is conveyed to the at least one intake engine valve via the first motion transfer mechanism. When the selectable coupling mechanism is operated in a second state, at least a portion of the main valve actuation is again conveyed to the at least one intake engine valve, and the LIVC and IEGR valve actuations are conveyed to the at least one intake engine valve via the second motion transfer mechanism, the coupling mechanism and the first motion transfer mechanism.

The present application relates to the technical field of diesel engine valve train, and discloses a kind of auxiliary heating control method of variable valve engine valve train, comprising: obtaining engine speed, engine battery voltage, engine coolant temperature, first oil temperature and second oil temperature;According to engine coolant temperature, first oil temperature and second oil temperature, oil heating reference temperature is calculated, and oil heating time is determined;According to engine speed and oil heating reference temperature, the current heating control mode of valve train is determined;According to engine battery voltage and heating device fault state, heating device is controlled to heat the oil in auxiliary oil tank according to the current heating control mode within oil heating time.The present application also discloses a kind of auxiliary heating control device and system of variable valve engine valve train.The variable valve engine valve train auxiliary heating control method provided by the present application can improve engine power and fuel economy.

Motor valve (100) for use in an internal combustion engine (200), wherein the motor valve (100) comprises: a shaft (104) with a first end and a second end; a tip (102) positioned at the first end of the shaft (104); as well as a plate section (116) with a throat (108) and a combustion surface (114), wherein the plate section (116) is friction-welded to the second end of the shaft (104), wherein the plate section (116) is cast from a single-crystal metal (306), has no grain boundary (406) and is resistant to temperatures above 850 °C wherein the shaft (104) is made of polycrystalline forged steel and wherein the single-crystal metal (306) is a nickel-based superalloy.

The application discloses an engine valve tappet precision grinding spindle head and belongs to the technical field of grinding spindle heads, which comprises a machine shell, a driving assembly, a pull-and-release assembly and an adjusting assembly. The machine shell comprises a sleeve arranged at the front end and a pull claw which is inserted into the sleeve. The pull-and-release assembly comprises a pull rod which is rotatably inserted into the machine shell and a cylinder arranged at one end of the pull rod for driving. The inner end of the pull rod is fixedly connected with the tail end of the pull claw. The driving assembly comprises a motor fixedly arranged at the top of the machine shell, a first belt pulley fixedly arranged on the output end of the motor and a second belt pulley fixedly sleeved on the outer wall of the outer end of the pull rod. The application optimizes the overall structure, is reasonable and compact in structure, reduces the production cost, reduces the motor vibration on the spindle head, improves the rotating roundness precision of the valve tappet on the spindle head and makes the processed tappet higher in quality precision.

This utility model discloses a device for outboard engine valve tapping and airtightness testing, belonging to the field of airtightness testing technology. It includes a workbench, with an operation panel supported and connected to the right end surface of the workbench via an auxiliary rod. A third deep groove ball bearing is connected to the right end surface of a rotating bracket, and a third encoder is installed at the other end of the third deep groove ball bearing. A rotating base plate is provided between a third diaphragm coupling and the third deep groove ball bearing. A connecting frame is provided above the rotating base plate, and a valve tapping mechanism is installed inside the connecting frame. A tray assembly is installed on the upper surface of the rotating base plate. This utility model, through a series of structural features, achieves stable grinding, improved precision, and reduced costs. Simultaneously, the adoption of a three-axis linkage architecture ensures equipment stability and reliability, improves the quality of tapping and grinding, and integrates tapping and grinding with airtightness testing functions, making operation more convenient and simple.