296 results about "Common rail" patented technology

The common rail oil injector with the static leakage structure comprises an oil injector body, a control valve seat, a control valve matching part, a needle valve assembly and a needle valve body, and is characterized in that a middle hole pressure storage cavity is formed in the oil injector body and used for containing the control valve matching part and the needle valve assembly; the control valve matching part serves as the only static leakage matching part and is composed of a control valve sleeve and a control valve rod in clearance fit with the control valve sleeve, a static oil return channel comprising a first inclined oil return hole, a first vertical oil return hole and an annular groove is constructed in the control valve sleeve, a second oil return through hole in the high-pressure sealing face of the control valve seat is matched, and a specific fuel leakage backflow path is formed. Compared with a traditional 2000 bar common rail oil injector, static leakage matching parts are reduced, the fuel oil leakage amount is greatly reduced, oil consumption is effectively reduced, carbon emission is reduced, meanwhile, the reliability of the oil injector is improved, and the service life of the oil injector is prolonged. The middle hole pressure storage cavity can reduce oil injection pressure fluctuation, and the average effective injection pressure and the multi-time oil injection precision are improved. The oil injector body and the needle valve body are simplified in structure, and machining difficulty and manufacturing cost are reduced.

The invention relates to an intelligent control technology of an internal combustion engine, in particular to a multivariable cooperative control method of a dual-fuel engine, which realizes dynamic optimization matching of fuel injection and an air system through deep reinforcement learning and multivariable decoupling control technologies. According to the method, a dual-fuel engine multivariable cooperative control system based on deep reinforcement learning and dynamic decoupling is constructed, the dual-fuel engine multivariable cooperative control system is composed of an air system control layer, a multivariable decoupling layer and a fuel injection control layer, and the air system control layer controls the fuel injection control layer through a TD3-PID algorithm according to the vehicle speed, the vehicle speed and the vehicle speed. The rotating speed N, the torque T, the common rail pressure Prail, the fuel temperature Tfuel and the mixed fuel density rho mix are operated in real time to serve as state variables, data are collected and processed, and the dynamic adjustment amount of the electronic throttle valve is obtained; by means of a PSO-PID decoupling mechanism and a DDPG-PID intelligent control algorithm, decoupling regulation and control over the dual-fuel dynamic ratio, the EGR rate and the supercharging pressure according to working condition changes are achieved, the economical efficiency, the emission performance and the dynamic performance of the dual-fuel engine under the dynamic operation working condition are remarkably improved, and the method has the advantages of being high in self-adaptive capacity and high in robustness.

The invention aims to provide a solid hydrogen storage hydrogen closed cycle hydrogen source generator for an underwater vehicle, which belongs to the field of dehydrogenation devices and comprises a reactor, a pressure stabilizing common rail pipe, a hydrogen storage material delivery pump, a solid hydrogen storage material storage unit, a solid hydrogen storage material spraying device, a product collecting device and a hydrogen storage unit. The hydrogen storage material conveying pump is connected with the pressure stabilizing common rail pipe, the solid hydrogen storage material storage unit and the solid hydrogen storage material spraying device, the hydrogen storage unit is connected with the pressure stabilizing common rail pipe, and the reactor is connected with the hydrogen storage unit. The solid hydrogen storage material is used for releasing hydrogen, one part of hydrogen is conveyed to the fuel cell to react for power output of the underwater vehicle, the other part of circulating hydrogen assists the hydrogen storage material in injection, and an underwater closed circulation mode suitable for the underwater vehicle is achieved. The solid hydrogen storage material conveying module and the circulating hydrogen supply module are matched, and rapid mixing of the solid hydrogen storage material and hydrogen and large-flow injection of the solid hydrogen storage material are achieved.

The invention relates to the technical field of high-pressure hydrogen storage of hydrogen fuel cell automobiles, and provides a high-pressure hydrogen storage bottle opening combination valve with a streamline runner and a control method. The combination valve integrates a high-pressure stop valve, a two-way flow regulating valve, a filter and a pressure / temperature / flow sensor, an air supply channel, an air inflation channel, a discharge channel and a cooling channel are designed, and the air supply channel and the air inflation channel are provided with a common rail type channel. A pilot-operated pressure reducing valve and a main runner bidirectional flow regulating valve are additionally arranged on the gas supply channel to form a two-stage pressure reducing system, so that the pressure and flow of hydrogen at an outlet are effectively limited, and the hydrogen is safely conveyed to a fuel cell; a redundant one-way valve is additionally arranged on an inflation channel to achieve rapid filling. Flow resistance and turbulent flow dissipation are remarkably reduced through a streamline channel, a sealing interface is reduced through modular integration, actuation response and power density are improved, and safety and stability of pressure reduction gas supply and high-pressure filling working conditions, intrinsic safety of the system and reliability of the whole life cycle are ensured.

The present invention relates to the technical field of two-stroke engines, and discloses a multi-cylinder ignition type air-injection two-stroke direct injection multi-fuel design structure, which includes a fuel system, an intake system and a mixed rail air-injection system. The multi-cylinder ignition type air-injection two-stroke direct injection multi-fuel design structure has the following characteristics: intake boosting technology: using an air compressor to achieve intake boosting, thereby improving engine performance; air-assisted boosting technology: using an air compressor to achieve in-rail auxiliary boosting, thereby increasing the degree of mixing of fuel and air and improving engine performance; air-injection cylinder direct injection technology: the atomized particle diameter of the existing high-pressure common rail technology is about 10-15 microns. Through the air-injection technology, the mixed particles of fuel and air are more thoroughly atomized, and the diameter of diesel can be made to 5-8 microns, thereby realizing ignition type cylinder direct injection; and multi-fuel driving technology: it is easier to ignite low-ignition-point fuels, thereby achieving full combustion in different oil environments such as gasoline, kerosene, diesel, and alcohol gasoline.

The invention discloses a marine high-pressure common rail diesel engine MPC combustion control method based on a physical informatization neural network, and belongs to the field of marine high-pressure common rail diesel engine control. The problems that physical consistency of a model and a real machine is ignored and the generalization ability of the model is poor due to the fact that only data driving is relied on are solved. The method comprises the following steps: keeping a combustion midpoint unchanged, and acquiring in-cylinder pressures, in-cylinder maximum pressure rise rates, indication heat efficiency and emission data of different pilot injection fuel ratios and pilot main injection positive time intervals; calculating the average indicated pressure circulation change of the diesel engine, screening data and calculating the accumulated heat release amount and the combustion midpoint; obtaining an influence rule of related characterization parameters of combustion in a diesel engine cylinder, and determining a crank angle corresponding to pilot injection timing, a pilot injection fuel ratio, a pilot main injection interval boundary and an upper limit of a maximum pressure rise rate of cylinder pressure; a diesel engine in-cylinder combustion prediction output model and an MPC controller are constructed; and updating control parameters and combustion state data to realize closed-loop control. The method is used in energy-saving and emission-reducing fields.

The invention discloses a method and a system for monitoring pressure abnormity of a fuel oil common rail pipe of a marine main engine. The method comprises the following steps: acquiring historical operation parameter data and constructing a data set; the historical operation parameter data comprises historical host load data, historical host rotating speed data and historical fuel oil common rail pressure data; historical operation parameter data are preprocessed, an SVDD model is constructed and trained based on the historical operation parameter data, the model obtains a historical normal data hyper-sphere in a three-dimensional feature space, and the center and the radius of the hyper-sphere are obtained; similarly, real-time operation parameter data collected in real time are preprocessed and then input into the model, the distance between the real-time operation parameter data and the center of the hypersphere is obtained, and the value of the distance is compared with the value of the radius of the hypersphere in historical normal data; and when the numerical value of the distance is large, it is judged that the real-time operation parameter data is within an abnormal range, the fuel oil common rail pressure of the ship main engine is in an abnormal state, and an alarm signal is triggered. The method has the effect of low error rate.

The present application provides a novel low-pressure methanol pipeline structure and process method. The novel low-pressure methanol pipeline structure includes a common rail pipe and a supply pipe. The common rail pipe comprises an inner pipe and an outer pipe, each of which is coaxially sleeved and fixed by flanges at both ends. The inner pipe comprises a first inner pipe, an inner module, and a second inner pipe, which are sequentially connected. The inner module has a connection hole. The outer pipe comprises a connected integral outer pipe and two halves. The integral outer pipe covers the inner module, and the integral outer pipe has an outer pipe joint seat corresponding to the connection hole of the inner module. The supply pipe comprises a third inner pipe, an intermediate pipe, an outer pipe, and a threaded joint, which are sequentially sleeved from the inside to the outside. The end of the third inner pipe is exposed through the end of the outer pipe and at least partially connected to the connection hole to connect to the inner module. One end of the threaded joint is sleeved on the end of the outer pipe, and the other end is sleeved on the wall of the third inner pipe via a two-half ferrule. The outer pipe joint seat is sleeved on the end of the threaded joint.

According to an aspect of the present application, there is provided a radially deformable volume splitter (100; 200) for a fuel injection system (1) of a spark-ignition engine (2). The volume splitter (100; 200) can be tubular and elongate, extending along a longitudinal axis from a first end (102) to a second end (104). The volume splitter (100; 200) can comprise a deformable longitudinal slot (116) operable to deform the volume splitter (100; 200) radially from a first state for insertion into a cavity (18; 218) of the emulsion injection common rail (10) to a second state for use within the cavity (18; 218), and a set of slots (112a-112k) arranged on an outer surface (106) of the volume splitter (100; 200) to connect, in use, an inlet (20) of the cavity (18; 218) to one or more outlets (22a-22d) of the cavity (18; 218).

The invention discloses a test system, a test method and a test device for a common rail system of a diesel engine, and a storage medium. The test system comprises a driving module which is electrically connected with an oil supply pump of the diesel engine common rail system and is used for driving the oil supply pump to operate; the detection module is arranged on the diesel engine common rail system and used for detecting working condition parameters of the diesel engine common rail system; and the controller is electrically connected with the driving module and the detection module. The detection module can monitor working condition parameters such as oil pressure, temperature and flow of the common rail system in real time, comprehensiveness and accuracy of the testing process are ensured, the controller receives and processes data transmitted by the detection module, whether the common rail system is in a normal working state or not is judged through analysis, and the driving module is controlled to stop working in time. According to the invention, the technical problem of common rail system fault processing delay in the prior art is solved.

The application discloses a starting device for a marine methanol engine, which comprises a compressed air control unit, a compressed air starting unit, a supplementary combustion unit, a rotating speed signal sensor and a plurality of Hall sensors. The compressed air control unit comprises a pressure reducing valve, a first one-way valve and a first electromagnetic reversing valve. The compressed air starting unit comprises a first electromagnetic on-off valve, a second electromagnetic reversing valve, a first pneumatic reversing valve, a second one-way valve, a second pneumatic reversing valve and a silencer. The supplementary combustion unit comprises a second electromagnetic on-off valve, a common rail pipe, a supplementary combustion gas injection valve, a third one-way valve and a third electromagnetic on-off valve. The starting device can quickly realize the cold state starting and the hot state starting of the marine methanol engine by using a small number of valve combinations, has high automation degree and good integration degree, and conveniently and efficiently solves the difficult starting problem of the marine methanol fuel engine.

The invention relates to the technical field of engines, in particular to a marine methanol engine combustion control method and system which comprises a high-pressure common rail module, an injection quantity control module, an injection time control module, a multi-nozzle layout module and a preheating module. The high-pressure common rail module is electrically connected with the injection quantity control module, the injection time control module, the multi-nozzle layout module and the preheating module, and the multi-nozzle layout module is electrically connected with the injection quantity control module, the injection time control module and the preheating module, so that the injection quantity and the injection time of methanol can be accurately controlled; by accurately controlling the injection amount, a proper amount of methanol fuel can be provided according to the actual demand of an engine, waste and incomplete combustion of the fuel are avoided, the injection time of methanol in an air cylinder can be more reasonable by accurately controlling the injection time, the injection time can be better matched with the processes of air inlet, compression and the like, and the combustion efficiency is improved.

The invention relates to an injection system, an engine, a vehicle and an injection control method. The injection system comprises a high-pressure oil pump, a main injection loop and a pre-injection loop. The high-pressure oil pump is provided with a first output end and a second output end. The main injection circuit includes a first high pressure common rail tube fluidly connected with the first output, and a main injector connected with the first high pressure common rail tube. The pre-injection circuit includes a second high pressure common rail tube fluidly connected with the second output, and a pre-injector connected with the second high pressure common rail tube. The pre-injection circuit is configured to inject at a lower pressure than the main injection circuit. Through the arrangement of the integrated oil pump, the system structure is remarkably simplified, and the manufacturing cost is reduced. Meanwhile, the pressure of the two loops is independently adjustable, flexible combination of pre-injection and main injection can be achieved, the injection atomization effect and the combustion process are optimized, and therefore the dynamic property, economical efficiency and emission performance of the engine are comprehensively improved.

The present application relates to a kind of monomer pump common rail quick pressure building method, device and motor vehicle, before obtaining tooth signal, the first tooth signal obtained is virtual 0 number tooth, second tooth signal is virtual 1 number tooth, in turn analogies;When virtual N0 number tooth is obtained, according to the drive duration of pre-marking, drive monomer pump to run;During monomer pump continues to run to virtual 2N0 number tooth, if still not obtain tooth signal, and the pressure in common rail pipe rises, then with odd multiple N0 as the driving time of monomer pump, and the driving duration is N0 tooth signal;If the pressure in common rail pipe does not rise, then with even multiple N0 as the driving time of monomer pump, and the driving duration is N0 tooth signal, to common rail pipe pressure rise.

The invention relates to the technical field of switch rails, in particular to a production method of an elastic bendable switch rail for a compound dividing turnout, which comprises the following steps: determining the steel rail model of the switch rail according to the model of a stock rail; determining the machining range of the switch rail according to the steel rail model; precise cutting is conducted on the determined machining range through slicing machining, the horizontal inertia moment and the flexural rigidity of the switch rail are weakened, and an elastic bendable section is formed; the cut switch rail is subjected to precision verification; forging and pressing the point rail subjected to precision verification, and processing the section of the point rail into a common steel rail section consistent with that of the stock rail; the forged and pressed switch rail is cooled, straightened and detected, the switch rail produced through the method is stable and simple in structure, the problems that bolts are broken off, rail seams are eroded and the like are reduced, the reliability of the switch rail is improved, the service life of the switch rail is prolonged, and maintenance convenience of the switch rail is improved.

A pneumatic differential pressure common rail actuator comprises a pneumatic actuator, a pneumatic valve, and a pneumatic control unit. The pneumatic valve comprises a valve body and a rotor valve core. The rotor valve core is inserted radially into the valve body along the direction of extension of the gas pipeline. The rotor valve core rotates circumferentially and is axially and radially limited within the valve body. The upper portion of the rotor valve core slides upward and downward and is coaxially inserted into the valve stem. An arc-shaped guide groove is formed on the circumferential outer wall of the upper portion of the rotor valve core. An air hole is radially formed in the middle portion of the rotor valve core. The bottom of the rotor valve core is rotatably connected to the bottom inner wall of the valve body via a valve core bearing. This pneumatic differential pressure common rail actuator and its actuation posture force analysis method have the advantage of scientific computability. The basic theory of mechanical analysis of the pneumatic differential pressure common rail actuator is established, and the relevant formulas derived based on this basic theory are highly instructive for the design, verification, and testing of the structure of the present invention.

This utility model relates to a common rail injector with replaceable control valves, including a solenoid valve assembly, a metering block assembly, a needle valve assembly, and a locking cap. The solenoid valve assembly includes an injector body, an electromagnet, an armature, a control valve core, a first spring, and a valve ball, with the valve ball detachably mounted on the lower end of the control valve core. The metering block assembly includes a metering block and a ball valve seat, with the ball valve seat detachably fixed in a mounting groove. The needle valve assembly includes a needle valve body, a needle valve core, a control chamber sleeve, and a second spring. The injector body, metering block, and needle valve body are arranged sequentially from top to bottom and detachably fixed together by the locking cap. This utility model is easy to maintain and adjust, and can better meet the usage requirements of marine electronically controlled common rail fuel systems.

This invention relates to a method for calculating the dynamic wear of a plunger pair in a marine common rail jet pump. First, a dynamic model is established to solve for the forces and micro-motions (eccentricity and tilt angle) of the plunger. Then, based on e and , the oil film thickness and pressure are calculated, and the oil film bearing capacity and lateral load are balanced through iteration. Next, surface roughness is introduced to determine the lubrication state, and the Reynolds equation is modified to characterize mixed lubrication. Force balance iteration is performed again to obtain a more accurate oil film pressure and thickness distribution. Finally, based on the results of the modified model, the wear amount is calculated using the micro-protrusion contact theory and the Arcard wear formula. This method, by coupling plunger micro-motion, oil film state, surface morphology, and operating parameters, realizes the calculation of dynamic wear, improves the operating condition adaptability of wear assessment, and provides a certain basis for the condition monitoring and life assessment of the plunger pair.

This invention provides a test method for determining injection fusion in multiple injections of a high-pressure common rail system, comprising the following steps: S1. Constructing a high-pressure common rail system injection pattern test system to test the injection pattern of two injections: pre-injection + main injection; S2. Constructing a high-speed photography direct-view test system for the injection process of the high-pressure common rail system to test the spray development characteristics under injection intervals; S3. Processing the images of the spray development process of multiple injections of the high-pressure common rail system, and repeating the spray development characteristic test until the fuel sprays of the two injections merge. The test method for determining injection fusion in multiple injections of a high-pressure common rail system described in this invention employs a spray visualization test method, obtaining the actual development process of real fuel spray in the cylinder, which can accurately determine whether actual fuel spray fusion has occurred in the cylinder, solving the problem of misjudgment of injection fusion based on control signals and injection pattern curves.

The invention discloses a coating film repairing and cleaning device for a high-pressure common-rail fuel system, and belongs to the technical field of engine cleaning equipment.The coating film repairing and cleaning device comprises a cleaning table, a liquid storage cylinder is fixedly installed in the middle of the top end of the cleaning table, and a high-pressure liquid pump and a condenser are fixedly installed at the two ends of the cleaning table respectively; the inlet end and the outlet end of the liquid storage cylinder are connected with a condenser and a high-pressure liquid pump correspondingly, symmetrically-arranged positioning plates are fixed to the two ends of the top of the filtering frame, and when the filtering assembly is cleaned, the stirring transverse rod can lift the positioning plates to drive the filtering frame to be separated from the liquid storage cylinder. And through linkage cooperation with the filtering assembly, the multi-stage filter screen is convenient to quickly disassemble and assemble, convenient to clean or replace, capable of saving the maintenance time, compact and flexible in overall structure, capable of simplifying the cleaning agent treatment period and capable of effectively improving the cleaning work efficiency.

The invention relates to the technical field of ship positioning, and discloses a ship common rail type combined roller trolley positioning device which comprises a positioning pile, a driving assembly is arranged outside the positioning pile, and the driving assembly can drive the positioning pile to move horizontally and ascend and descend. The positioning pile can be driven to move to be inserted into seabed soil in cooperation with a driving assembly, so that a ship can be stably positioned, the positioning pile can be adjusted, it can be guaranteed that a positioning hole is aligned with an insertion hole, and therefore it is guaranteed that a follow-up plug pin can be smoothly inserted into the positioning hole to complete positioning of the positioning pile; by means of the structure, heat can be transferred to the gauge pile in cooperation with the rubber ring, water mist on the surface of the gauge pile is evaporated, the situation that the rubber ring and the gauge pile slip due to the water mist cannot occur subsequently, and smooth adjustment of the gauge pile is guaranteed.

The invention discloses a metering valve eccentric wear control method, system and equipment and a readable storage medium, and relates to the field of diesel engine high-pressure common-rail fuel system control, in particular to the steps that a fuel metering valve is controlled to be driven at a preset first duty ratio; after the fuel oil metering valve is continuously driven for a preset first duration according to the first duty ratio, the fuel oil metering valve is controlled to be continuously driven for a preset second duration according to a preset second duty ratio, and the first duty ratio is larger than the second duty ratio; and the steps are repeatedly executed for preset times to prevent eccentric wear of the metering valve. The problem that eccentric wear of the fuel metering valve needs to be solved urgently at present can be prevented on the premise that cost is not increased.

This invention discloses an integrated gas distribution device and method for a dual-fuel engine gas injection system in the field of dual-fuel engine technology. The device includes a common rail system, a pressure replenishment component, and a pulse pressure replenishment mechanism. The common rail system includes a common rail pipe and multiple injection valve supply pipes equipped with pressure sensors installed on the common rail pipe. This invention integrates electromagnetic valves capable of high-frequency pressure replenishment into the common rail system. Each electromagnetic valve alternately replenishes pressure to the injection valve supply pipes in a pulse manner, effectively reducing pressure loss in the injection valve supply pipes caused by the length of the common rail pipe and flow diversion. This significantly improves the stability and uniformity of gas injection, which is beneficial for stable engine operation and extends engine lifespan.

The invention provides a linear guide rail grinding machine, and belongs to the technical field of grinding machine equipment. The technical problem that in the prior art, the protection effect is poor is solved. The linear guide rail grinding machine comprises a machine body and a grinding device, a workbench used for conveying a guide rail is arranged on the machine body, a grinding housing is arranged on the grinding device, and the linear guide rail grinding machine is characterized in that a first protective housing and a second protective housing are arranged between the two ends of the grinding housing and the two ends of the machine body respectively, and a first negative pressure opening is formed in the grinding housing; a second negative pressure opening and a third negative pressure opening are formed in the inner end and the outer end of the first protective cover correspondingly, the first negative pressure opening, the second negative pressure opening and the third negative pressure opening are connected to a connecting pipeline in parallel and connected with a negative pressure pumping purifier, an air inlet assembly is connected to the grinding cover, and a common rail type double-sliding door located between the first negative pressure opening and the third negative pressure opening is arranged on the first protective cover. A feeding opening extending in the axial direction of the lathe bed is formed in the second protective cover, and a door opening and closing mechanism capable of being opened in the radial direction is arranged on the feeding opening. The device has the advantages of being good in protection effect, high in stability, high in safety and the like.

The utility model discloses a long-hole workpiece inner hole cleaning device, and relates to the field of workpiece machining, the long-hole workpiece inner hole cleaning device comprises a supporting seat, a grinding motor is fixed on the supporting seat, a rotating shaft is fixed at the output end of the grinding motor, a grinding head is fixed at one end, away from a grinding cleaning motor, of the rotating shaft, and a moving mechanism is arranged on the supporting seat. A fixing mechanism is arranged on the supporting seat, a controller is arranged on one side of the supporting seat, and a fuel oil common rail is arranged on the supporting seat. The fuel oil common rail needing to be cleaned is placed on the fixing structure, the fixing mechanism fixes the fuel oil common rail, then the moving mechanism drives the fixing mechanism, the fixing mechanism drives the fuel oil common rail, then the grinding head is inserted into an inner hole of the fuel oil common rail from one end of the fuel oil common rail, and then the grinding head grinds and cleans the fuel oil common rail. Therefore, the grinding head can be stably inserted into the fuel oil common rail, the possibility that the grinding head deviates is reduced, and an inner hole of the fuel oil common rail can be conveniently cleaned.

An injector and rail assembly (10,fig.1) comprising a fuel injector 22 provided with a ring flange 48 and an injector head 20 for receiving fuel. The rail assembly comprises a common rail housing (12,fig.1) defining a reservoir volume 14. The rail housing comprises at least one socket 16 having a bore 18 for delivering fuel from the reservoir volume to the injector head. The injector and rail assembly further comprises a mechanical connector 26 for sealingly mounting the fuel injector to the socket. The connector has an upper portion 50 to threadedly engage an outer surface 28 of the socket and a lower portion 54 having a first face 66 to interface with a second face 62 of the ring flange. At least one of the first and second surfaces define a curved surface. The first face may be convexly curved and the second surface may be concavely curved.

The invention discloses a novel nano fuel mixing device and system, and relates to the technical field of fuel supply, the novel nano fuel mixing device comprises an oil tank, a low-pressure pump, a filter and a feeding device which are sequentially connected through a low-pressure pipeline, and a fuel disperser, a heat exchanger, a high-pressure pump, an ECU, an EDU, a high-pressure common rail, an oil injector and an oil return pipe which are sequentially connected through a high-pressure oil way. The fuel oil disperser is composed of a pressurization acceleration mechanism, a pressure gauge, a dispersion mechanism and a heat exchanger, the pressurization acceleration mechanism comprises a motor, an oil supply pump and a hydraulic pressurization pump, and the dispersion mechanism comprises a material feeding module and a homogenizing bin. The problems that the nano fuel cannot be rapidly obtained due to the fact that the nano additive cannot be efficiently and uniformly mixed in the fuel and the mixed fuel is poor in effect are solved, it is guaranteed that the nano additive fuel oil is rapidly prepared, and the uniformity and stability of the nano additive fuel oil in the fuel oil are guaranteed.

This utility model relates to the field of cam divider technology and proposes a noise-reducing cam divider, including a cam divider, a buffer mechanism, and a lubrication mechanism. The cam divider consists of a housing, cam rollers, a common rail cam, and an indexing plate. The buffer mechanism is located at the bottom of the cam divider to buffer the vibrations generated during operation. The lubrication mechanism is located on one side of the housing to add lubricating oil between the cam rollers and the common rail cam. During the operation of the cam divider, vibrations caused by itself and external factors generate noise. The vibration force is transmitted through multiple springs and dampers via hinged support rods one and two, which are respectively connected between the fixed plate and the mounting plate. The combined effect of these springs and dampers effectively buffers and cancels the vibration force, thereby stabilizing the operation of the cam divider and controlling vibration and noise to a very small and smooth level.

According to the high-pressure common-rail fuel injection pump, descending reset of the plunger is forced, a plunger reset spring is not needed, meanwhile, an oil delivery pump is omitted, two one-way valves are arranged in a low-pressure oil way, and necessary cooling and / or lubricating fuel oil is provided for the fuel injection pump. As a result, a smaller size, a higher applicable rotational speed, lower noise, in particular a lower overall cost, is achieved.

The present application provides a rail pipe assembly for dimethyl ether fuel, which can reduce fuel leakage and provide fuel purging function. The rail pipe assembly comprises: a common rail pipe, which has a high-pressure cavity for containing dimethyl ether fuel inside; an oil inlet end cover, which is installed at one end of the common rail pipe, and has a first one-way valve assembly and a second one-way valve assembly communicating with the high-pressure cavity, the first one-way valve assembly being used for feeding high-pressure liquid dimethyl ether fuel into the high-pressure cavity, and the second one-way valve assembly being used for feeding purging medium into the high-pressure cavity; an end cover, which is installed at the other end of the common rail pipe; at least one valve seat, which is installed on the common rail pipe and has a middle hole communicating with the high-pressure cavity at one end; and at least one functional component, which is installed on the valve seat and communicates with the other end of the middle hole of the valve seat. The installation positions of the oil inlet end cover, the end cover and the valve seat have spaces for containing leaked dimethyl ether fuel respectively, and the dimethyl ether fuel in each space is led out of the rail pipe assembly through a leakage joint.