111 results about "Valve lift" patented technology

The embodiment of the invention provides a variable lift rocker arm structure and a variable valve phase and lift rocker arm assembly structure, and relates to the technical field of rocker arms. According to the variable-lift rocker arm structure and the rocker arm assembly structure with the variable valve phase and lift, the variable-lift rocker arm structure comprising the rocker arm body and the auxiliary rocker arm structure is arranged, and the rocker arm body achieves switching of the extending position of the piston assembly through oil under the action of the auxiliary rocker arm structure; the first position is the first position or the second position, so that the first valve lift and the second valve lift generated by the valve are switched; on one hand, the eccentric wear influence on the tappets when double rollers or double tappets are switched in the prior art can be reduced to a certain extent; on the other hand, the number of parts is reduced, the mass is reduced, and the overall rotational inertia of the variable lift rocker arm structure is small.

The invention belongs to the technical field of vehicles, and discloses a variable valve lift device and a vehicle, the variable valve lift device comprises a rocker arm shaft, an electromagnetic valve, a cam, a fixed rocker arm and a switching rocker arm, the electromagnetic valve is arranged on a support of the rocker arm shaft, the electromagnetic valve is provided with an oil supply way communicated with an engine main oil way, the responsiveness and reliability of a system are improved, and the reliability of the system is improved. The cam is arranged on the rocker arm shaft, the fixed rocker arm is arranged on the rocker arm shaft and can make contact with the cam, the fixed rocker arm is provided with a driving part, the shell is provided with a switching oil way, the switching oil way is communicated with the oil supply way, and the valve is arranged in the shell and divides the shell into a force transmission cavity and a pressure relief cavity. The plunger is arranged in the force transmission cavity in a sliding mode and can make contact with the driving part, the two ends of the first elastic piece are connected to the plunger and the valve respectively, the push rod is arranged in the pressure relief cavity in a sliding mode and can open or close the valve, the two ends of the second elastic piece are connected to the push rod and the bottom wall of the pressure relief cavity respectively, lock pin mechanical force transmission is replaced with hydraulic force transmission, and switching noise is eliminated.

The invention relates to a rocker arm assembly with roller deactivation. More specifically, a variable valve lift rocker arm assembly may include an outer rocker arm body having a valve end and a cam end and configured to rotate about a first shaft. The inner rocker arm body may be configured to rotate about a first shaft or a second shaft and selectively and operably locked to the outer rocker arm body via a latch assembly. The latch assembly may have a first latch pin actuated by a latch pin spring, a second latch pin, and a third latch pin driven hydraulically, mechanically or pneumatically. The latch assembly may have a locked mode in which relative movement between the inner rocker arm body and the outer rocker arm body is locked, and an unlocked mode in which relative movement between the inner rocker arm body and the outer rocker arm body is permitted.

The invention discloses an engine intake manifold flow test bench and a test method, and belongs to the technical field of engine test equipment. The frequency converter is electrically connected with the fan, the fan is communicated with the pressure stabilizing box, the pressure stabilizing box is provided with a butterfly valve, the pressure stabilizing box is communicated with the pressure stabilizing barrel through an air inlet channel, the air inlet channel is provided with an air inlet flow meter and an air inlet flow differential pressure sensor, the pressure stabilizing barrel is communicated with the momentum meter, and the momentum meter penetrates through the test bed table to be communicated with the simulation cylinder sleeve. The test bed table is connected with the simulation cylinder sleeve and provided with a valve lift adjusting mechanism, the valve lift adjusting mechanism is provided with a push rod, and the push rod is provided with a displacement sensor and driven by a stepping motor. Through technical innovation and system integration, a full-process solution from test design, data acquisition to performance evaluation is constructed, powerful technical support is provided for research and development, optimization and quality control of the engine intake manifold, and the method has profound significance in promoting technical progress and product upgrading of the engine industry.

A spool valve assembly operable for automatic control of oil flow includes: a housing; a spool valve configured to slide axially within the housing; a first inlet port on the housing configured to connect to a first oil passage, wherein the first oil passage is operable as an outlet of a first oil control valve; a second inlet port on the housing configured to connect to a second oil passage, wherein the second oil passage is operable as an outlet of a second oil control valve; a valve core outlet on the housing configured to connect to a third oil passage; and a return spring configured to return the spool valve to a rest position.

The invention provides an engine in-cylinder brake test bench and a test method, relates to the technical field of engine test, and aims to solve the problem that an existing test bench cannot reproduce valve lift loss under a real high-pressure load. In the process that a power driving source drives a cam shaft to force a brake valve to open, the loading mechanism continuously applies a reverse mechanical acting force to the valve, so that a huge blocking load generated by high-pressure gas in a cylinder to the valve in a compression stroke of a real engine is approximately simulated physically; the valve and a transmission mechanism of the valve are passively in a real high-load stress state, so that lift reduction caused by elastic deformation or hydraulic compression of parts is simulated, a high-load operating environment in a cylinder is effectively restored, and real dynamic data including actual lift loss are measured.

The present invention discloses a method, apparatus, electronic device and storage medium for judging the switching action of valve lift. The method includes: determining the current rotation angle of the camshaft based on a first acquisition device; when it is determined that the current rotation angle is greater than or equal to a preset angle threshold, determining the extended position of the pin corresponding to the current rotation angle based on a second acquisition device; determining the deviation value between the extended position of the pin and the reference position of the pin corresponding to the current rotation angle; and determining whether the valve lift of the electronic device is successfully switched according to the deviation value. It is possible to detect the rotation angle of the camshaft. When the rotation angle of the camshaft is greater than or equal to the preset angle threshold, measure the extended position of the pin. By comparing the extended position of the pin with the reference position, it is possible to accurately judge whether the valve lift switching is successful, improve the performance of the device, and enhance the user experience.

The application discloses an engine air intake assembly, an engine, a vehicle and an engine air intake control method, which comprises: a first intake valve with a first intake lift profile; and a second intake valve with different second intake lift profiles, namely, a first profile, a second profile, a third profile and a fourth profile. The first profile is the same as the first intake lift profile; the valve lift and valve opening time of the second profile are less than those of the first intake lift profile; the valve lift of the third profile is less than that of the first intake lift profile; and the valve lift and valve opening time of the fourth profile are less than those of the first intake lift profile. The second intake valve selects the corresponding second intake lift profile to operate under different engine requirements, so that the second intake valve and the first intake valve are asynchronous in air intake, different vortex effects are generated in the cylinder, and different engine cylinder gas flow requirements are met.

internal combustion engine (8) comprising a camshaft (1) which drives at least one inlet valve (5) with which a fluid inlet in a cylinder (9) of the internal combustion engine (8) can be controlled, - wherein the camshaft (1) comprises at least one cam (2), - wherein the cam (2) has at least a valve opening elevation (7) and a control projection (3,4), - wherein the valve opening lift (7) is arranged to open the inlet valve (5) to a maximum stroke, - wherein the inlet valve (5) is open at least during part of a compression movement of a piston (6) of the internal combustion engine (8) associated with the inlet valve (5) in order to decompress the cylinder (9), - wherein the inlet valve (5) can be controlled by the camshaft (1) via a variable valve timing system, and - wherein the variable valve control allows the valve lift of the inlet valve (5) to be adjusted, - wherein by adjusting the valve lift of the intake valve (5) the operation of the internal combustion engine (8) can be switched between depending on a speed of the internal combustion engine (8) ◯ an operation with early closing of the inlet valve (5) at high speeds, and ◯ an operation with late closing of the inlet valve (5) after the bottom dead center of the piston (6) at low speeds, - characterized by the fact that ◯ the operation with early closing of the inlet valve (5) before a bottom dead center of the piston (6) is adjustable by a small valve lift, and ◯ the operation with late closing of the inlet valve (5) is adjustable by a large valve lift.

A rocker arm assembly is rotatable about a rocker arm shaft and comprises a first section and a second section. The first section is configured to accommodate a valve lift profile. The second section is configured to interact with one or more valves. The rocker arm assembly also includes an actuating assembly, which is switchable between a first state and a second state, and a tappet assembly, which is provided in a tappet bore and has a tappet axis angled with respect to a longitudinal axis of the actuating assembly.

The application discloses a variable timing valve opening degree measurement method, device, storage medium and vehicle, and relates to the technical field of variable valve timing control, and can be used for measuring the opening degree of a variable timing valve. The method comprises the following steps: acquiring a camshaft signal wheel duty cycle signal of a camshaft signal wheel, and determining base tooth position information of the camshaft signal wheel according to the camshaft signal wheel duty cycle signal; acquiring crankshaft signal wheel sensor measurement information of a crankshaft signal wheel, and determining flag tooth position information of the crankshaft signal wheel according to the crankshaft signal wheel sensor measurement information; and determining the real-time opening degree of the variable timing valve according to the base tooth position information, the flag tooth position information and zero position information.

This invention relates to an engine, an engine control system, and a vehicle. The engine includes: a hydraulic drive assembly with an inlet and an outlet, the inlet receiving a drive medium from the engine's main oil passage, the hydraulic drive assembly compressing the drive medium, and the outlet outputting the compressed drive medium; and a valve drive assembly with an inlet connected to the outlet to receive the compressed drive medium, the valve drive assembly driving the valve assembly to move under the action of the compressed drive medium. The engine provided in this application controls valve lift by controlling the pressure of the drive medium, achieving flexible and controllable valve movement, resulting in higher braking efficiency and braking power.

The invention discloses a rotor assembly, a motor, an engine and a vehicle. The rotor assembly comprises a rotor shaft, a shaft sleeve, a magnetic steel sleeve and a blocking part. The shaft sleeve is sleeved outside the rotor shaft and is in transmission connection with the rotor shaft, the shaft sleeve is provided with an annular glue storage groove, and an adhesive is arranged in the glue storage groove. The magnetic steel sleeve is arranged outside the shaft sleeve in a sleeving mode, the glue storage groove is sealed through the magnetic steel sleeve, and the magnetic steel sleeve and the shaft sleeve are bonded through an adhesive. The blocking part is connected with the shaft sleeve and located in the glue storage groove so as to block at least part of the adhesive from moving along with the magnetic steel sleeve in the process that the magnetic steel sleeve is arranged on the shaft sleeve in a sleeving mode. According to the rotor assembly, at least part of the adhesive can be prevented from moving along with the magnetic steel sleeve through the blocking part, the effective bonding area between the magnetic steel sleeve and the shaft sleeve is increased, and the bonding effect is improved. Therefore, the situation that the rotor cannot rotate normally when the VVL motor works is avoided, then it is guaranteed that the variable valve lift system can operate stably, and the situation of slow adjustment or adjustment failure is avoided.

A valve arrangement for a fluid control system has a housing, comprising a fluid inlet, a fluid outlet, and extending along a central axis. The valve arrangement has a valve component, movable along the central axis between a first position, closing the fluid inlet, and a second position, a maximum valve lift defined therebetween. The valve arrangement has a biasing member, biasing the valve component towards the first position, and an intermediate component movable along the central axis, and relative to the valve component. The valve arrangement has a first stop and a second stop, the intermediate component axially movable therebetween, a range of the relative axial movement being less than the maximum valve lift. During an initial axial movement of the valve component from the first position, the intermediate component moves relative to the first stop and the second stop, and upon the intermediate component reaching the limit of the range of relative axial movement a subsequent movement of the valve component is opposed by an intermediate frictional force generated by the intermediate component.

Supercharged internal combustion engine (10) with at least two cylinders (1), in which - each cylinder (1) has at least one inlet opening (2a, 2b) for supplying charge air via the intake system (3) and at least two outlet openings (4a, 4b) for discharging exhaust gas via the exhaust gas removal system (5), each outlet opening (4a, 4b) being connected to an exhaust line (5a, 5b), - at least one exhaust gas turbocharger (8) is provided, which comprises a turbine (8a) arranged in the exhaust gas discharge system (5) and a compressor (8b) arranged in the intake system (3), - the exhaust pipes (5a, 5b) are configured in such a way that they form two groups, each group comprising at least one exhaust pipe (5a, 5b) from each cylinder (1) and the exhaust pipes (5a, 5b) of each group each merging to form an exhaust manifold into a total exhaust pipe (6a, 6b), - the first exhaust line (6a) of a first group opens into the turbine (8a) of the at least one exhaust gas turbocharger (8), - the second exhaust line (6b) of a second group opens into the intake system (3) upstream of the compressor (8b) of the at least one exhaust gas turbocharger (8), and - the outlet openings (4b) belonging to the exhaust pipes (5b) of the second group are each equipped with an at least partially variably actuated outlet valve, wherein this outlet valve of the second group can be moved between an open position and a closed position, forming a maximum valve lift Δh 2ndexhaust oscillates and thereby closes the corresponding outlet opening (4b) during an opening process for the opening duration Δt 2ndexhaust releases, characterized in that - a blow-off line (7) is provided, in which a shut-off element (7a) is arranged and which branches off from the exhaust manifold of the second group to form a first node (7b) and opens into the exhaust gas discharge system (5) downstream of the turbine (8a) of the at least one exhaust gas turbocharger (8) to form a second node (7c), wherein the blow-off line (7) opens into the exhaust gas discharge system (5) upstream of an exhaust gas aftertreatment system (11) provided in the exhaust gas discharge system (5) to form the second node (7c).

This invention discloses an intake and exhaust control mechanism and a four-stroke high-power valve incorporating the mechanism, including a valve, a rocker arm for driving valve opening and closing, a cam, and a transmission assembly connecting the cam and the rocker arm; it also includes a lift adjustment assembly and a buffer assembly; the transmission assembly includes an axially extendable tappet, the bottom end of which rolls in contact with the cam, and the top end of which abuts against one end of the rocker arm; this invention belongs to the technical field of internal combustion engine valve train mechanisms, and its purpose is to solve the problems of fixed or discontinuous lift adjustment, large impact under high load, and mismatched buffer characteristics in existing valve mechanisms. The technical effect achieved is: by driving the tappet to extend and retract through a threaded adjusting pair and a bevel gear transmission pair, stepless adjustment of valve lift is realized, which reduces the lift and enhances swirl under low load, and increases the lift and improves charging efficiency under high load, while the thread self-locking ensures stable adjustment and optimizes intake and exhaust performance under all operating conditions.

The invention provides an air cylinder device which comprises an air cylinder, an air valve and a combined rocker arm mechanism. The combined rocker arm mechanism comprises a shaft seat, a rotating shaft, a branch rocker arm, a main rocker arm and an adjusting mechanism; the rotating shaft is rotatably arranged on the shaft seat; the support rocker arm is provided with a first end part and a second end part, the first end part is matched with the cam, and the second end part is fixedly connected to the rotating shaft; the main rocker arm is provided with a third end and a fourth end, the third end is used for pressing the other end, extending out of the cylinder cover, of the valve, the fourth end is located on the side, back to the valve, of the first end at intervals, and the middle of the main rocker arm is rotationally connected to the rotating shaft; the adjusting mechanism comprises a gear, a toothed bar and a cushion block, the gear rotatably sleeves the rotating shaft and is driven by the adjusting driving mechanism, one end part of the toothed bar is meshed with the gear, and the other end part of the toothed bar extends and is connected to the cushion block cushioned between the first end part and the fourth end part; the adjusting mechanism drives the gear to drive the toothed bar and the cushion block to move, the distance between the first end and the fourth end is adjusted, and therefore the valve lift is adjusted.

A rocker arm assembly (200) is rotatable about a rocker arm shaft (130) and includes a first portion and a second portion. The first portion is configured to receive a valve lift profile. The second portion is configured to operatively engage with one or more valves. The rocker arm assembly further includes a lost motion assembly (210) configured to absorb at least a portion of the valve lift profile; and a switchable unit (230) having an actuator assembly and a plunger (232) disposed within the plunger bore. Further, the switchable unit includes a plunger securing assembly (235).

The present invention corresponds to an internal combustion engine (1) comprising a combustion chamber, a fuel injection circuit (60), an intake line (20) for fresh gases equipped with at least one intake valve, an exhaust line (80) for combustion gases equipped with at least one exhaust valve and a catalytic converter (83), a variable valve lift system, and a computer (100). More specifically, the present invention comprises a method for controlling such an engine, comprising obtaining operating parameters for the engine and determining a nominal set point for controlling the variable lift system as a function of said parameters. According to the present invention, the objective is to correct said nominal set point in order to open the intake valve earlier and / or close the exhaust valve later when the amount of oxygen in the catalytic converter is below a certain oxygen threshold and when pressure permits.

Method for detecting coking in the intake tract of an internal combustion engine with direct fuel injection, throttle valve and variable intake valve lift control, comprising the following steps: - Determining a correction value (KW) which is calculated by the intake valve lift control as an offset value with a preset valve lift; - Performing an initial quantity deviation test, by which an initial air-fuel ratio value (w1) is determined from a lambda value (λ) measured during the initial quantity deviation test. real, 1 ) and a desired lambda value (λ soll, 1 ) the fuel combustion in the combustion chambers of the internal combustion engine, whereby in the first quantity deviation test a load control is carried out by means of the variable intake valve lift control; - Performing a second quantity deviation test, by which a second air-fuel ratio value (w2) is determined from a lambda value (λ) measured during the second quantity deviation test. real, 2 ) and a desired lambda value (λ soll, 2 ) the fuel combustion in the combustion chambers of the internal combustion engine, whereby in the second quantity deviation test a load control is carried out by means of the throttle valve; - Determining a comparative result (VE) from the first air ratio value (w4) and the second air ratio value (w2); - Determine whether coking is present in the intake tract of the internal combustion engine by combining the comparison result (VE) and the correction value (KW).

The utility model relates to a valve lifting positioning device for an electric gate valve, which comprises a valve body, a support and a valve cover, the support is fixedly mounted above the valve body, the valve cover is mounted at the top of the valve body, a gate plate is movably mounted in the support, the bottom end of the gate plate penetrates through the valve cover, two groups of scraping plates are fixedly mounted at the top of the valve cover, and the scraping plates are fixedly mounted on the support. The material scraping plates are symmetrically installed on the two sides of the gate plate and attached to the outer wall of the gate plate, positioning assemblies are installed on the two sides of the support, each positioning assembly comprises two first limiting wheels and a second limiting wheel, the two first limiting wheels are arranged on the two sides of the gate plate in an attached mode respectively, the second limiting wheel is installed between the two first limiting wheels, and the first limiting wheels and the second limiting wheels are arranged on the two sides of the gate plate. The second limiting wheel is attached to the edge of the side edge of the flashboard, the two first limiting wheels clamp the flashboard, the second limiting wheel is attached to the edge of the flashboard, the descending direction of the flashboard is controlled, the flashboard cannot deviate in the descending process, the first spring on the side edge of the connecting block provides buffering when the flashboard descends, and the flashboard is prevented from shaking.

The present invention relates to an internal combustion engine provided with an optimized intake system. The engine derives from a traditional diesel cycle engine but is modified and optimized in its intake system to achieve performance superior to that of traditional diesel engines. According to the invention, some main characteristics of the timing system are modified to obtain, when required, a specific behavior of the intake valve lift curve. By operating in this way, it is possible to carry out an internal recirculation of the burnt gases, a reforming of the fuel (for example, from ammonia to hydrogen), a thermodynamic cycle similar to a Miller cycle.

A variable valve lift rocker arm assembly may include an outer rocker arm body having a valve end and a cam end. The outer rocker arm body may be configured to rotate around a first axle of the outer rocker arm body. The variable valve lift rocker arm assembly may include an inner rocker arm body configured to selectively and operatively latch to the outer rocker arm body through a latching assembly. The latching assembly may include one or more latch pins actuated by a first actuating assembly and a second actuating assembly to switch between a latched mode and an unlatched mode. In the latched mode, the relative motion between the inner rocker arm body and the outer rocker arm body may be locked. In the unlatched mode, the relative motion between the inner rocker arm body and the outer rocker arm body may be permitted.

The application discloses a kind of electro-hydraulic variable valve opening duration continuous variable closed-loop control methods, belong to valve opening state identification technical field, comprising: the laser displacement sensor for detecting valve lift signal is installed in the lift end of electro-hydraulic variable valve, the calibration of opening time and closing time is carried out to each state valve data collected in Matlab, valve opening identification algorithm and valve closing identification algorithm used in Matlab offline test are written into ECU to carry out multiple-cycle open-loop test;With the identification valve opening duration as closed-loop feedback input, PID closed-loop controller is used to control valve to track target and realize the closed-loop switching of variable duration.The application can reduce the steady-state error of valve opening duration and realize continuous variable of arbitrary duration by taking the identification valve opening duration as feedback closed-loop control high-frequency solenoid valve high-frequency signal under the multiple-cycle operation of valve.

The utility model discloses a variable-lift valve device of an engine. The variable-lift valve device comprises a cam assembly, a valve rocker arm, a high-lift rocker arm and a low-lift rocker arm. The valve rocker arm is provided with a movable linkage pin; when the linkage pin retreats from the position below the high-lift rocker arm, the low-lift rocker arm drives the valve rocker arm to swing, and the high-lift rocker arm swings in an empty mode. When the linkage pin enters the position below the high-lift rocker arm, the high-lift rocker arm abuts against the linkage pin to drive the valve rocker arm to swing, and the low-lift rocker arm swings in an empty mode. Compared with a variable valve lift rocker arm structure in the prior art, under the high-speed working condition, inertia applied to a valve spring can be reduced, the design force value of the valve spring can be reduced, power consumed by the variable valve lift rocker arm mechanism can be reduced, and the dynamic performance of an engine can be improved to a greater extent. The utility model further discloses a motorcycle engine comprising the variable lift valve device of the engine.

A valve train assembly includes a rocker arm assembly for actuating a brake valve. The rocker arm assembly has a rocker arm that is rotatable about a rocker arm shaft. An actuator is located at one valve end of the rocker arm. The actuator is movable between an extended position and a retracted position by a first predetermined distance. A cam is configured to engage a cam face of the rocker arm. The cam has a reloading lift profile dimensioned to move the valve end of the rocker arm according to the valve lift profile, which has a maximum height exceeding the first predetermined distance.

Steam control valve, comprising: a housing (1); a valve seat (2) formed within the housing (1); a valve plate (3) which can be placed against the valve seat (2); a valve lift rod (4A, 4B) connected to the valve disc (3), extending in the vertical direction and penetrating the housing (1); a bushing (5A, 5B) provided in the housing (1) and slidably supporting the valve lift rod (4A, 4B); a lever (6A, 6B) connected to an upper end of the valve lift rod (4A, 4B); and an actuating member (7) which causes the lever (6A, 6B) to pivot, characterized in that a box section (22A, 22B) with a downward opening is provided on one end side of the lever (6A, 6B), and the box portion (22A, 22B) of the lever (6A, 6B) is loosely fitted with an overhang portion (23A, 23B) on one side of the valve lift rod (4A, 4B), and the overall size of an interior space of the box portion (22A, 22B), ie the size of the interior space in a vertical direction and a horizontal direction, is larger than the overhang portion (23A, 23B) by an amount corresponding to a predetermined value, taking into account positional displacements of the bushing (5A, 5B) due to thermal expansion of the housing (1).

The invention discloses an engine braking control method and device, electronic equipment and a medium. The engine braking control method comprises the steps that the vehicle weight, the current road slope and the current vehicle speed are obtained; target braking power is determined according to the vehicle weight, the current road slope and the current vehicle speed; according to the target braking power, the target air inflow needed by engine braking is determined; and according to the target air inflow, the air inlet valve lift and the switching angle are adjusted so that the engine can be braked. By the adoption of the technical means, the target braking power is determined according to the working condition of the vehicle, the target air inlet amount needed by engine braking is determined according to the target braking power, then the air inlet valve lift and the opening and closing angle are adjusted, the engine is braked, and the braking effect of the engine is improved.

The present application relates to the technical field of engine valve timing measurement, and discloses an engine valve timing measurement device, which comprises a driving mechanism and a measuring mechanism; the driving mechanism comprises a motor and a shaft coupling, the motor comprises an encoder, the output shaft of the motor is connected with the shaft coupling, and the shaft coupling is used for being connected with a crankshaft of an engine; the measuring mechanism comprises a base, a first displacement measuring device, a second displacement measuring device and a tappet component, and the first displacement measuring device is arranged on the base. The present application also discloses an engine valve timing measurement method, which comprises reading a first rotation angle alpha1 of the crankshaft when a piston actual top dead center is read by the encoder and a second rotation angle alpha2 of the crankshaft when a tappet lift is h, calculating a clamping angle beta of the crankshaft through the first rotation angle alpha1 and the second rotation angle alpha2, obtaining a rotation angle gamma of the crankshaft from a starting point of a valve lift m to a moving starting point of the tappet to the tappet lift h, and calculating a valve timing delta = beta-gamma. The present application does not need to replace the hydraulic tappet.

The utility model relates to a low-friction labor-saving double-drainage-valve lifting control mechanism which is arranged in a drainage valve body, a half-drainage button and a full-drainage button which are reset by a spring are installed on a button seat of the drainage valve body, and a half-drainage floating barrel and a full-drainage floating barrel which are in linkage fit with the lifting control mechanism to drain water and close water are arranged in the drainage valve body. A half-drainage floating barrel, a full-drainage floating barrel and an inner core pipe are assembled in a drainage valve body to form a half-drainage structure and a full-drainage structure; the lifting control mechanism is provided with a pair of symmetrically-arranged lever assemblies. One end of the lever assembly abuts against the half-drainage button and the full-drainage button, the other end of the lever assembly is connected with the sliding groove of the inner core pipe in a sliding mode through the idler wheel, and when the half-drainage button or the full-drainage button is pressed, the inner core pipe is controlled to be lifted through rotation of the lever assembly and sliding of the idler wheel, so that the water sealing piece connected to the lower portion of the inner core pipe is lifted to drain water. The device has the advantages of low friction, labor saving and prolonged service life of products.