24results about "Valve drives" patented technology

An internal combustion engine includes a plurality of chains that are arranged axially adjacent to each other with respect to a crankshaft protruding from an internal combustion engine body, and are each distributed with power from the crankshaft, a chain tensioner that applies tension to the chain, a chain guide that guides the chain, and a bracket that is attached to the internal combustion engine body so as to straddle at least one of the plurality of chains, and at least one of the chain tensioner and the chain guide is attached to the bracket.

A valve train method for a dual-lift camshaft in a range-extending engine belongs to the field of automotive engine technology. The invention includes the following steps: Cam profile design: designing the cam profile of the camshaft, wherein the cam buffer section adopts a constant acceleration-constant velocity profile, and the cam working section adopts a high-power polynomial cam profile design method to design the first cam profile and the second cam profile respectively; Cam profile correction: using a cam profile dynamic correction method, obtaining the final first target cam profile and the second target cam profile used for machining the camshaft; Operating condition selection and valve drive: selecting the engine's operating point, and driving the valves to open and close according to the corresponding valve motion law through a rocker arm valve train mechanism to achieve valve train operation. This invention can solve the technical problems of existing fixed-lift camshafts in range-extending engines, which cannot simultaneously meet the requirements of economic operating conditions and rated operating conditions, as well as poor NVH performance and high mechanical losses.

The invention relates to an assembly comprising a heat engine equipped with a cylinder head (2) covered by a cylinder-head cover (4), which between them receive at least one camshaft having, on one side, a joining edge parallel to its axis, which is formed between two flat surfaces, and comprising a tool for adjusting the rotation of the camshaft, which tool fits into a bore in the cylinder-head cover, the adjustment tool comprising an attachment part (20) for attachment to the cylinder-head cover (4), and an independent rod comprising, at its end, a notch having two bearing faces which, in the fixed position of the tool, bear on the two surfaces of the camshaft on either side of the edge.

An internal-combustion engine supplied with gaseous fuel, in particular hydrogen, comprises, for each cylinder (1), a first intake duct (3A) and a second intake duct (3B), controlled, respectively, by a first intake valve (VA) and a second intake valve (VB). In each operating cycle of the cylinder, a movement of opening and closing only of the first intake valve (VA) is firstly activated, while the second intake valve (VB) remains closed, and a movement of opening and closing only of said second intake valve (VB) is subsequently activated, while the first intake valve (VA) remains closed. The gaseous fuel is supplied directly into the cylinder only starting from an instant subsequent to closing of the first intake valve (VA) and prior to opening of the second intake valve (VB) in such a way as to be able to obtain a regular combustion, without pre-ignition phenomena or backfiring phenomena, thanks to the cooling obtained during opening of the first intake valve.

The present disclosure relates to the technical field of vehicles, and particularly relates to a timing system installation method and a vehicle. The timing system installation method comprises: establishing a corresponding relationship between a phase of a camshaft and a rotational torque of the camshaft on a valve spring; selecting one of the phases in which the rotational torque of the camshaft is not zero as an installation phase; installing the camshaft and a crankshaft by using the installation phase, and calculating a limit installation phase deviation of the camshaft, the direction of the limit installation phase deviation being the same as the direction of the rotational torque of the camshaft at the installation phase. By making the camshaft be acted on by an external force applied by the valve spring during installation and be deviated in only one direction at the installation phase, the limit installation phase deviation can be deviated in one direction instead of being randomly deviated in two directions, and the limit installation phase deviation can be calibrated as an inherent property of the engine by using an EMS control model, so that random errors can be reduced, the installation precision of the camshaft can be improved, and the engine control precision can be improved.

The utility model discloses a novel 20 cylinder gas engine camshaft relates to engine field. The novel 20 cylinder gas engine camshaft includes the neck of axle and the plurality of lugs and sprocket installed on it, the one side of neck is provided with installation component, the installation component includes the splicing block, the locating rod, the fixed disc and the locking bolt. The novel 20 cylinder gas engine camshaft passes through setting installation component, makes sprocket can be quickly, accurately installed to the neck, when also can easily complete when needing to disassemble, greatly shorten the assembly and maintenance time of engine, improved work efficiency. The locating rod is inserted through the first through -hole on sprocket and the second through -hole on fixed disc, provides accurate positioning for the installation of sprocket, the fixed disc is clamped in sprocket outside, and is closely connected through locking bolt and splicing block, further strengthens the stability of sprocket installation, effectively prevents sprocket loosening in the operation process of engine.

In an opposed-piston mechanism, an intake compression cylinder (1) and an expansion exhaust cylinder (2) are individually provided, and a rotating perforated columnar valve (3) and an ignition combustion chamber (4) are formed therebetween. A valve mechanism is arranged on a cylinder side surface side, and a disk cam (7) that moves in conjunction with crank rotation operates an intake valve (33) and an exhaust valve (34) on a cylinder side surface via a movable fulcrum type rocker arm (8). A movable structure of the rocker arm also realizes opening / closing amounts of the intake valve (33) and the exhaust valve (34) according to an operating situation of an engine. Since a piston pin (18) and a piston pin (30) can absorb variations of an engine that occur when two connecting rods are connected to one piston, the two connecting rods can be easily connected to the one piston.

This provides a sprocket structure that prevents incorrect assembly of the timing chain into the groove. [Solution] The cam sprocket 3 is fixed to the axial end of the camshaft 16 provided in the engine 1 for a vehicle, and the timing chain 5 is attached to it. The cam sprocket 3 includes teeth 31 that mesh with the inner plate portion 51 of the timing chain 5, an annular portion 32 having an outer diameter corresponding to the outer diameter of the teeth 31 and arranged at an axial distance from the teeth 31, and a groove 33 arranged between the teeth 31 and the annular portion 32. The axial width Ws1 of the groove 33 is narrower than the axial width Wc2 of the outer plate portion 52, which consists of a pair of outer plates 52A arranged on both axial sides of the inner plate portion 51 of the timing chain 5.

The present invention provides an engine that can optimize valves and their advancing / retreating mechanisms in the vicinity of a cylinder chamber. The engine 10 comprises: a cylinder chamber 12, an intake valve 18, an exhaust valve 19, and an advancing / retreating mechanism 20 that advances and retreats the intake valve 18 and the exhaust valve 19. The advancing / retreating mechanism 20 has a camshaft 21, an exhaust cam 22, an intake cam 23, a pushrod 24, and a rocker arm 25. The intake cam 23 is fixed to the camshaft 21 and is configured to advance and retreat the intake valve 18. The exhaust cam 22 is configured to advance and retreat the pushrod 24. The rocker arm 25 is rotated by the pushrod 24 and is configured to advance and retreat the exhaust valve 19.

Provided is an opposed-piston engine capable of minimizing a mechanism for transmitting rotational power of a crankshaft to a valve. An opposed-piston engine (1) includes a cylinder (4), a first piston (8A) provided in the cylinder, a second piston (8B) provided in the cylinder and opposed to the first piston, a first crankshaft (9A) which rotates as the first piston rotates, a second crankshaft (9B) which rotates as the second piston rotates, a valve (13) which performs an operation to intake or exhaust air into or from the cylinder, and a power transmission mechanism (20) which transmits the rotational power of the first crankshaft to the valve so as to cause the valve to perform the operation. The first crankshaft and the second crankshaft are juxtaposed with a space therebetween in an alignment direction in which the first piston and the second piston are aligned, and the power transmission mechanism extends in the alignment direction to a position corresponding to the first crankshaft and to a position corresponding to the second crankshaft across the space therebetween.

The present application relates to a valve drive mechanism, which can realize flexible control of engine valve opening timing and opening lift, accurately realize consistency of valve opening design curve and actual curve, and is not affected by engine thermal state. The valve drive mechanism system has large rigidity, short response time, small valve seating impact, and valve opening parameters can be freely controlled in a large range, meeting the needs of different engine working conditions and various new combustion technologies.

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.

This internal combustion engine comprises: a combustion chamber; an exhaust passage connected to the combustion chamber; a first exhaust valve which opens / closes the interface between the exhaust passage and the combustion chamber; and a second exhaust valve disposed adjacent to the first exhaust valve and opens / closes the exhaust passage. The valve opening period of the second exhaust valve is shorter than the valve opening period of the first exhaust valve. The first exhaust valve and the second exhaust valve close simultaneously.

The application discloses a method for optimizing a reverse cam mechanism profile and evaluating dynamic stability, comprising the following steps: constructing a simple harmonic motion cam profile equation containing parameter correction based on the motion law of a crank slider mechanism; establishing a four-degree-of-freedom dynamic equation containing time-varying contact stiffness of the reverse cam mechanism based on Newton's second law; calculating the gas pressure and gas stiffness in the cylinder by using the ideal gas polytropic process theory; calculating the curvature radius of each point of the cam profile equation, and constructing a stiffness matrix of the reverse cam mechanism in combination with the time-varying contact stiffness and the gas stiffness; solving the four-order time-varying natural frequency of the reverse cam mechanism corresponding to the stiffness matrix, and analyzing the unstable domain under parameter excitation by using the Floquet theory to determine the parameter value range of the simple harmonic motion cam profile equation containing the parameter correction.

The utility model discloses an air distribution mechanism and an automobile. The air distribution mechanism comprises an air inlet cam shaft, the air inlet cam shaft drives a roller rocker arm, the roller rocker arm drives an air inlet valve to do linear motion, the air inlet cam shaft comprises an air inlet cam peach piece, the base circle radius of the air inlet cam peach piece is 16 mm, and the maximum lift range of the air inlet cam peach piece is 6-7 mm. According to the gas distribution mechanism, the combustion efficiency of the engine can be improved.

The invention provides a method of controlling an internal combustion engine (1) in a vehicle comprising a cylinder (301, 302), a fuel system (330) for supplying fuel to the cylinder, an air guide (901) arranged to guide an air flow to the cylinder (301, 302), and an exhaust guide (501, 502) arranged to guide a gas flow from the cylinder (301, 302), the method comprising - controlling the engine to provide a braking torque, the control comprising, - terminating (S1) the supply of fuel to the cylinder (301, 302), - restricting (S4) the flow through the exhaust guide (501, 502), and - restricting (S6) the flow through the air guide (901), - wherein the control of the engine to provide a braking torque also comprises - determining (S5) a value of a rotational speed of a turbocharger (4) of the engine, and - adjusting (S6), in dependence on the determined turbocharger rotational speed value, the restriction of the flow through the air guide (901), and / or the restriction of the flow through the exhaust guide (501, 502).

The present disclosure relates to an engine assembly for a vehicle. The engine assembly comprises an engine including a cylinder head and an engine block. The engine block comprises a cylinder block and a crankcase having a crankshaft. The engine may be used in different models of the vehicle having different characteristics by interchanging or replacing the cylinder head from a plurality of cylinder heads and / or a cylinder block from a plurality of cylinder blocks, while keeping one or more engine components such as the crankcase, a timing chain, or a valve cover the same. Accordingly, the engine is adaptable to different vehicles.

This invention relates to a diagnostic method, a controller, and a motor vehicle, specifically a diagnostic method (100; 200; 200') in which a predicted value (103; 203) indicating the phase of the camshaft is predicted for a predetermined time point. Furthermore, an actual value (105; 205) indicating the phase of the camshaft is measured at the predetermined time point. Finally, a fault in the camshaft adjustment of the cylinder block valve for adjusting the cylinder block of an internal combustion engine is determined based on the predicted and actual values ​​(111; 219). Furthermore, this invention relates to a controller (500) and a motor vehicle (600) having the controller.

This invention relates to a sliding camshaft assembly for an internal combustion engine, the sliding camshaft assembly comprising at least a first sliding camshaft (1) having a longitudinal axis and a second sliding camshaft (2) having a longitudinal axis, wherein: - the first sliding camshaft (1) includes a support shaft (11) and at least one sliding cam (12), the sliding cam (12) including a first cam (121) and at least one second cam (122) and a switching gate (123); - the second sliding camshaft (2) includes a support shaft (21) and at least one sliding cam (22), the sliding cam (22) including a first cam (221) and at least one second cam (223). 22) and a switching gate (223); - The first sliding camshaft (1) and the second sliding camshaft (2) are parallel to each other, and the sliding cams (12 and 22, respectively) are arranged on the corresponding support shafts (11 and 21, respectively) in an axially slidable manner to rotate together with the support shafts; - A transmission device (4) is arranged between the first sliding camshaft (1) and the second sliding camshaft (2), the transmission device being used to transmit the switching state of the sliding cam (12) of the first sliding camshaft (1) to the sliding cam (22) of the second sliding camshaft (2); - The transmission device (4) includes a first thrust rod (41) and a second thrust rod (42). The present invention also relates to a method for switching a sliding camshaft assembly for an internal combustion engine according to at least one of the preceding claims.

The present application provides a control system and method for a hydraulic cartridge valve with segmental action, wherein the system comprises: a detection module for detecting a current operating phase of the hydraulic cartridge valve at a given time; a determination module for determining an opening degree of a proportional servo valve corresponding to the hydraulic cartridge valve at the given time, based on the current operating phase at the given time; and a control module for controlling the oil charging volume of each servo motor of the hydraulic cartridge valve based on the opening degree of the proportional servo valve and for completing the control of the hydraulic cartridge valve.The technical solution provided in the present application solves the problem of cartridge valve failure, ensures the reliability and synchronization of the cartridge valve action and is of great importance for improving the reliability of the hydraulic cartridge valve control system of large hydroelectric power plants.

An engine braking device having a return function, and an engine. The engine braking device comprises: a camshaft (10), comprising an auxiliary cam (11) having a non-working surface (111) and a working surface (112) thereon; a brake rocker arm (20) and a rocker arm shaft (30), the brake rocker arm (20) being provided with a limiting portion thereon; a movable unit (40), comprising a sliding portion (41) and a rolling portion (42); a rocker arm support (50), provided with a first connection portion (51); a return spring bracket (60), one end thereof being connected to the first connection portion (51), and the other end thereof being provided with a return spring seat (70); and an elastic member (80), arranged transversely and clamped between the return spring seat (70) and the limiting portion. During engine braking, when the rolling portion (42) is in contact with the non-working surface (111), the distance between the return spring seat (70) and the limiting portion is minimal; and during engine braking, when the rolling portion (42) is in contact with the working surface (112), the distance between the return spring seat (70) and the limiting portion is maximal. In said engine, the elastic member (80) is arranged transversely, thereby reducing the overall vertical dimension of the entire engine braking device.

An engine braking device having return and limit functions, and an engine. The engine braking device comprises: a camshaft (10), the camshaft (10) comprising an auxiliary cam (11); a brake rocker arm (20) and a rocker arm shaft (30) fitted together via a shaft hole, wherein a side portion of the brake rocker arm (20) extends in a horizontal direction to form an abutment platform (21), a limiting recess (31) is provided on an outer surface of the rocker arm shaft (30), and a limiting protrusion (22) is provided on the brake rocker arm (20); a rocker arm support (40) provided with a first connection portion (41); a return spring bracket (50), one end thereof being connected to the first connection portion (41), wherein a horizontal height of the first connection portion (41) and a horizontal height of the second connection portion (32) are both higher than a horizontal height of the abutment platform (21), and a horizontal height of the return spring bracket (50) is lower than a horizontal height of an upper surface of the brake rocker arm (20); and a first elastic member (70), two ends thereof being clamped between the other end of the return spring bracket (50) and the abutment platform (21). In the engine, the vertical dimension of the entire engine braking device is reduced, thereby making the structure more compact.