222 results about "Hydraulic tappet" patented technology

The invention discloses a variable valve timing system and relates to engines. According to the variable valve timing system, a variable lift hydraulic tappet component is arranged between an air inlet cam and an air inlet valve, an electronic device is used for judging the working conditions of an engine, when the engine speed is low, the pressure oil supply of an oil pump is cut off, the variable lift hydraulic tappet component only serves as a passive power transmission piece, the air inlet valve is only driven by the air inlet cam, and the air inlet valve has basic air valve opening/closing time, duration time and lift; when the engine speed is high, the pressure oil supply of the oil pump is opened, the variable lift hydraulic tappet component periodically charges and discharges oil under the indirect control of an air inlet valve oil distribution cam, the lift is changed, the air inlet valve is opened before the air inlet cam drive and closed after the drive, and the air inlet valve has air valve opening/closing time, duration time and lift under the high-speed working condition. The variable valve timing system is featured with compact structure, small valve seating impact and easiness in implementation.

The invention relates to a continuously variable valve lift mechanism. The continuously variable valve lift mechanism comprises a rocker arm, a cam, a hydraulic tappet, a roller, a middle rod and a swing link, wherein one end of the rocker arm is supported against and connected with the hydraulic tappet, and the other end of the rocker arm is in contact with a valve rod; the swing link is hinged to one end of the middle rod through a connecting pin; the roller is arranged at the other end of the middle rod through a pin shaft; the top surface of the rocker arm is provided with a guide groove along the length direction; the roller is positioned in the guide groove and is in contact with the cam; the roller can move along the length direction of the guide groove under the driving of the middle rod. The continuously variable valve lift mechanism can realize continuously variable control of valve lift under different working conditions of an engine, has a simple structure and comprises a small number of members.

The invention relates to a device and a method for realizing the engine brake; the device comprises an engine exhaust valve, a valve spring, an exhaust cam and a variable hydraulic tappet mechanism; wherein, the exhaust cam is a double-cam structure composed of an outer cam and an inner cam; the variable hydraulic tappet mechanism is positioned between the exhaust valve and the exhaust cam and is able to realize the switching between the inner cam and the outer cam; the engine exhaust valve is controlled by the outer cam in the normal operating stage and controlled by the inner cam in the brake stage; according to the designed profile line of the inner cam, the exhaust valve is controlled to be opened in the late period of the compression stroke and during the expansion stroke to realize the engine brake effect. The device and the method for realizing the engine brake have the advantages of simple structure, easy control, high reliability, realizing the engine brake and particularly realizing the rapid brake of the diesel engine.

A desmodromic “springless” valve and adjustable cam system is provided which is adapted to be installed onto a head configured for an overhead cam for an internal combustion engine having at least one intake and one exhaust valve per cylinder. The system includes a main camshaft, a cam lobe with a follower groove formed in each side of the cam, at least one intake and one exhaust valve assigned to each cylinder, a valve connector installed onto the distal tip of each valve, a hydraulic lifter assigned to each valve. The system further includes a rocker defined by a valve movement end and lifter end, wherein the valve movement end is adapted to be mechanically linked to a respective valve connector and the lifter end is adapted to be pressed against a respective piston tip by a rocker retainer. During operation (i.e., when the main camshaft rotates), the valve movement end of the rocker moves in manner which results in each valve being moved upwards and downwards as a function of the cam duration and lift, thereby opening and closing each respective valve.

The invention discloses a camshaft bearing structure for an engine, which consists of a first camshaft bearing and a plurality of same second camshaft bearings. The camshaft bearing structure for the engine is characterized in that: lower-half bearings of the second camshaft bearings are integrated on a cylinder cover; the first camshaft bearing is independent and not integrated on the cylinder cover. The first camshaft bearing is divided into an upper bearing cover and a lower bearing cover, is positioned by a positioning sleeve and is fixed on the cylinder cover through a fastening bolt. Oil ways are distributed in the upper cover and the lower cover of the first camshaft bearing and are used for introducing the pressure oil from the cylinder and providing oil for a hydraulic tappet, camshaft lubrication and a VVT phaser. By the independence of the first camshaft bearing, the front-end size of the cylinder cover can be obviously reduced, and the compactness of the engine can be improved. Meanwhile, the oil ways are arranged in the camshaft bearing covers, so that the camshaft bearing structure for the engine has the function of building a lubricating oil way, thereby simplifying the arrangement of the lubricating oil way of the cylinder cover.

The invention discloses a driver with a hydraulic tappet. The driver comprises a driver shell, a driving cylinder, a first piston, a second piston, a piston rod and the hydraulic tappet, wherein the hydraulic tappet further comprises a tappet plunger, a tappet body, a tappet high-pressure chamber, a tappet inflow channel, a discharge channel, a tappet one-way valve and a plunger return spring. The hydraulic tappet is optimized in design, and the driver with the hydraulic tappet has comprehensive advantages in terms of spatial size, high-pressure chamber pressure and cost, and is particularly applicable to valve clearance control of a variable valve driver. The hydraulic tappet is combined among the wall of the driving cylinder and the two pistons of the driver, the tappet body includes a tappet body end and a tappet body wall, the first piston serves as the tappet body end, the wall of the driving cylinder serves as the tappet body wall, so that the tappet high-pressure chamber can have a diameter as large as that of the driving cylinder to reduce the internal high pressure of the tappet high-pressure chamber, a normal air distribution function, low noise and reasonable service life are ensured, an additional tappet body wall structure and an additional high-precision matching structure are omitted, and manufacturing cost is reduced.

The invention belongs to the technical field of cold forming, and particularly relates to an integral roller forming method of an integrated hydraulic tappet plunger in a hydraulic gap adjuster in an automobile engine. The integrated hydraulic tappet plunger comprises a cylindrical body, one end of the body is a hemisphere, a rod is arranged in the middle of the body, the other end of the body is a main portion, a first circular groove is arranged between the hemisphere and the rod, a second circular groove is arranged between the rod and the main portion, and a fluid opening is arranged in the second circular groove. The integrated hydraulic tappet plunger is characterized in that the hemisphere, the rod and the main portion are integrally formed, and the wall thicknesses of the hemisphere, the rod and the main portion are equal. The integrated hydraulic tappet plunger and the processing forming method have the advantages that the integrated hydraulic tappet plunger is simple in structure and is processed and formed conveniently, investment of plunger production equipment can be reduced according to the scheme, production efficiency of the plunger is improved, and the produced integrated plunger is higher in integral strength and longer in service life as compared with a plunger in the prior art.

The invention discloses a hydraulic variable valve and a control method thereof. The hydraulic variable valve comprises a cam, a hydraulic tappet, a hydraulic plunger, a cylinder cover, a valve body and an control electromagnetic valve, wherein a guide hole is formed in the cylinder cover and corresponds to the valve body in position, the hydraulic tappet is a hollow cylinder with the lower end being open, the outer circle of the hydraulic tappet is matched with the guide hole, and the outer surface of the upper end of the hydraulic tappet makes contact with the cam; the hydraulic plunger is mounted in an inner cavity of the hydraulic tappet, the lower end face of the hydraulic plunger makes contact with the tail end of the valve body, and the outer circle of the hydraulic plunger is matched with the inner cavity of the hydraulic tappet; a pressure cavity is formed between the upper end of the hydraulic plunger and the inner surface of the upper end of the hydraulic tappet, and oil holes are formed in the side faces, corresponding to the pressure cavity, of the hydraulic tappet; and an oil duct is formed in the cylinder cover, the oil holes communicate with one end of the oil duct, and the control electromagnetic valve is mounted on the oil duct. By the adoption of the technical scheme, engine parameters can be adjusted and controlled flexibly, and accordingly a good air distribution effect can be achieved for an engine under various working conditions.

A springless poppet valve system is provided. The system includes a poppet valve movable between an open position and a closed position. The system also includes a cam shaft having an open cam and a close cam disposed thereon. An open rocker arm is also provided which has an open roller disposed to engage the open cam. The open rocker arm is operatively connected to the poppet valve so as to move the valve from the closed position to the open position when a high lift portion of the open cam engages the open roller. A close rocker arm is provided which has a close roller disposed to engage the close cam. The close rocker arm is operatively connected to the poppet valve so as to move the valve from the open position to the close position when a high lift portion of the close cam engages the open roller. An open hydraulic lifter is pivotally connected to the open rocker arm and operable to hold the open rocker arm in operative connection with the poppet valve. A close hydraulic lifter is pivotally connected to the close rocker arm and operable to hold the close rocker arm in operative connection with the poppet valve.

The invention belongs to the technical field of manufacturing of engine accessory. The cylindrical hydraulic tappet comprises a casing. A plunger piston capable of moving axially relative to the casing is mounted in an inner cavity of the casing correspondingly. A first ring groove is formed below the head of the plunger piston, a second ring groove is formed in the middle of the plunger piston, a plunger piston center wall is defined between the first ring groove and the second ring groove, and the second ring groove is a recessed wide ring groove. The cylindrical hydraulic tappet is characterized in that at least one oil inlet which is communicated with the second ring groove is formed in the plunger piston center wall, and a sealing strip which is matched with the inner cavity of the casing to cut off flowing of a hydraulic medium is reserved on the upper portion of the plunger piston center wall. The oil inlets of the plunger piston are formed in position relatively higher than a check valve so that oil storage capacity of an oil storage cavity of the plunger piston is increased; during cold start of an engine, sufficient hydraulic medium can be resupplied rapidly to enter a high-pressure cavity in the check valve, the time for the hydraulic tappet to reset to a normal work height from a compression height is shortened, the valve clearance is eliminated quickly, the noise reduction time during the cold start of a valve distributing mechanism is shortened while abrasion of related parts is reduced.

The invention provides a multifunctional metallic phase sample inlaying machine, relating to a sample inlaying machine, which solves the problems that the existing sample inlaying machine has only one die cavity to press only one sample each time, and manual pressurizing wastes physical strength and has great labor intensity. The sample inlaying machine comprises a pressure cover board, a steel plate die, six die cavities, a plurality of plugs, a plurality of adjusting screw rods, a jack, a plurality of stem heating pipes, a temperature sensor, a heating control valve, No.1 support plate and a temperature control box; the pressure cover board is fixed on the steel plate die; the steam heating pipes are orthogonally arranged in the internal part of the steel plate die in a mesh shape; the six penetrating die cavities are uniformly arranged on the steel plate die; the plugs are arranged in the internal cavities of the die cavities; the plugs are fixed on the upper ends of the adjusting screw rods; the lower ends of the adjusting screw rods are fixed on the No.1 support plate; the No.1 support plate is fixed on the upper surface of a hydraulic tappet of the jack; the temperature sensor is arranged in the steel plate die; the steam heating pipes are communicated with a steam pipeline through a heating control valve; and the temperature sensor is connected with the temperature control box. The sample inlaying machine is used for manufacturing coal-rock analyzing sample.

The invention discloses a continuously variable valve lift system, which relates to the field of engine valve design; the continuously variable valve lift system comprises a first rocker arm; the bottom side of a first end of the first rocker arm is in contact with a valve and can push the valve; the bottom side of a second end of the first rocker arm is supported by a hydraulic tappet; the continuously variable valve lift system further comprises a second rocker arm which is used for pushing the first rocker arm and driven by a fixedly arranged driving cam; the second rocker arm is arranged on an eccentric wheel and uses the center of the eccentric wheel as rotation center; the position of the rotation center of the second rocker arm is changed; correspondingly, directions and sizes of a power arm and a resisting arm as well as an angle between the second rocker arm and a horizontal plane are changed; and then the rotation quantity of the first rocker arm is driven to be changed; and finally, the lift of the valve in contact with the first rocker arm is changed; and according to the invention, problems of incomplete performance, complicated structure and expensive manufacturing cost of a lifting engine of the traditional valve lift system are solved.

In an internal combustion engine with variable actuation valves, each variable actuation valve is actuated by an actuator assembly including an actuating piston slidably mounted in a guide bushing. Between the actuating piston and the stem of the respective valve is interposed an auxiliary hydraulic tappet positioned outside the guide bushing of the actuating piston, so that said bushing can be dimensioned with a relatively small diameter, regardless of the outer diameter of the auxiliary hydraulic tappet. The intake valves of a same cylinder are actuated by a single cam, by means of a single pumping piston and by means of a single pressure chamber controlled by a single solenoid valve.

A mechanism for continuously adjusting engine valve lift is used for solving the problem of matching between the engine valve lift and engine running conditions. The mechanism comprises an adjusting arm assembly, a swinging arm, a connecting arm, a rocking arm, an eccentric shaft and a motor, the adjusting arm assembly is hinged to the connecting arm through an adjusting pin, the connecting arm is fixedly assembled with the swinging arm which is assembled with the rocking arm, two ends of the rocking arm are assembled with a valve and a hydraulic tappet respectively, the eccentric shaft is connected with a motor output shaft, and a set of eccentric wheel is arranged on the eccentric shaft. The mechanism is characterized in that a set of eccentric shaft adjusting plate is further arranged, the eccentric shaft adjusting plate is assembled with the eccentric shaft through a reciprocating motion support, a first working face matched with the eccentric wheel and a second working face matched with the adjusting arm assembly are arranged on the eccentric shaft adjusting plate, and the second working face is a circular-arc working face. By the mechanism, requirements on air inflow of an engine under different working conditions are met, the number of parts is reduced, and manufacturing cost of the parts is lowered.

A technology for forming a guide barrel body of hydraulic tappet includes such steps as providing rod material, blanking by sawing, extruding to form front and back cavity, rolling to form annular oil slot and reinforcing ribs, and machining. It has high mechanical performance and fatigue resistance.

Disclosed is a continuous and changeable valve lift control mechanism. The control mechanism is used for solving the control problem of valve lift matched with different working conditions of an engine. The control mechanism comprises a transmission component and a valve component. The transmission component comprises a cam, a rocker, a rocker supporting block, a rocker shaft, a rocker arm roller, a rocker arm and a hydraulic tappet. The control mechanism is characterized in that the rocker shaft can move up and down driven by a height adjusting motor which is fixedly mounted on an engine cylinder cover. The continuous and changeable valve lift control mechanism matched with a variable valve timing (VVT) system can be matched with the engine working conditions to adjust the valve opening lasting period and opening and closing moments, so that the gas feeding efficiency of the engine in all working conditions is the best, and the control mechanism is helpful for improving dynamic and economic properties and the discharge of the engine.

An engine lubrication system comprises a cabinet. A turbocharger, a lubricating oil tank, an oil cooler, an oil pump and an oil filter which are connected sequentially are arranged on the cabinet. The oil filter is connected with a main oil way in the cabinet. A bent axle hole and a camshaft hole are formed in the cabinet. The main oil way is communicated with the bent axle hole, the camshaft hole and mounting holes, used for mounting hydraulic tappets, on two sides of the camshaft hole. An oil storage tank communicated with the bent axle hole, the camshaft hole and the mounting holes is arranged at the bottom of the cabinet. An oil drainage hole is formed in the lower portion of the oil storage tank. The engine lubrication system is simple in structure, bent axle kinematic pairs, camshaft kinematic pairs and the like can be lubricated at different angles, and lubrication efficiency is improved.

The invention discloses a dual-TTV (Variable Valve Timing) engine oil gallery with a hydraulic tappet oil passage, comprising a main oil passage. The dual-TTV engine oil gallery is characterized in that: an engine oil control valve oil passage and a hydraulic tappet oil passage are connected to the main oil passage in parallel; an air inlet engine oil control valve installing cylinder and an air outlet engine oil control valve installing cylinder are connected to the engine oil control valve oil passage in parallel; a liquid inlet hydraulic tappet oil passage and a liquid outlet hydraulic tappet oil passage are connected to the hydraulic tappet oil passage in parallel; and the air inlet hydraulic tappet oil passage and the air outlet hydraulic tappet oil passage and the air outlet hydraulic tappet oil passage are respectively provided with four air inlet camshaft oil passages and four air outlet camshaft oil passages in a parallel connection way. According to the dual-VVT engine oil gallery disclosed by the invention, because when the oil passages are connected in parallel, a pressure-limiting oil plug is arranged in the right end part of the hydraulic tappet oil passage so as to limit pressure of the hydraulic tappet oil passage, pressure of the engine oil control valve oil passage is increased, and normal working of a VVT system is ensured; the oil gallery of the VVT system is shortened and simplified, and normal lubricating and working of various components of an engine are ensured; meanwhile, performance of the engine can be improved and oil consumption is reduced.