CN110295960B - Hydraulic control unit, valve bridge and engine - Google Patents
Hydraulic control unit, valve bridge and engine Download PDFInfo
- Publication number
- CN110295960B CN110295960B CN201810234276.4A CN201810234276A CN110295960B CN 110295960 B CN110295960 B CN 110295960B CN 201810234276 A CN201810234276 A CN 201810234276A CN 110295960 B CN110295960 B CN 110295960B
- Authority
- CN
- China
- Prior art keywords
- oil
- valve
- plunger
- spring
- channel
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
- F01L1/20—Adjusting or compensating clearance
- F01L1/22—Adjusting or compensating clearance automatically, e.g. mechanically
- F01L1/24—Adjusting or compensating clearance automatically, e.g. mechanically by fluid means, e.g. hydraulically
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
- F01L1/26—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of two or more valves operated simultaneously by same transmitting-gear; peculiar to machines or engines with more than two lift-valves per cylinder
- F01L1/267—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of two or more valves operated simultaneously by same transmitting-gear; peculiar to machines or engines with more than two lift-valves per cylinder with means for varying the timing or the lift of the valves
Abstract
The invention provides a hydraulic control unit.A plunger is used for conveying hydraulic oil from a first oil inlet hole to push the plunger to compress a first compression spring to move downwards, and the first compression spring pushes the plunger to move upwards after the top oil pressure of the plunger loses pressure. When the plunger moves downwards, the side wall of the plunger plugs the first oil discharge channel, when the plunger moves downwards to the third oil inlet hole and is communicated with the first oil discharge channel, oil enters the first oil discharge channel, the oil pressure in the first oil discharge channel is increased, after the oil pressure disappears, the first compression spring pushes the plunger to move upwards, and the oil pressure in the first oil discharge channel and the oil pressure in the second oil discharge channel are recovered to be consistent. The valve body is internally provided with a double-layer one-way valve structure formed by a valve core and a valve ball structure in the valve core, the switching of different oil pressures in a first oil discharge channel is realized by controlling the oil pressures at the two ends of the first oil inlet hole and the second oil discharge channel of the valve body, and the variable switching of different pressures of a driving structure is realized. The invention also provides an engine and a valve bridge.
Description
Technical Field
The invention relates to the technical field of engines, in particular to a hydraulic control unit, a valve bridge and an engine.
Background
The valve is used for specially inputting air into the engine and discharging combusted waste gas. From the engine structure, the engine is divided into an intake valve and an exhaust valve. The intake valve is used for sucking air into the engine to be mixed with fuel for combustion; the exhaust valve is used for discharging combusted waste gas and dissipating heat. The valve and valve seat are subject to the corrosion of high temperature gas and also the impact of explosion pressure in the cylinder.
For a four-valve engine, the valves are driven by the force of a valve bridge mounted at the top end of the valves to transfer rocker arms, ensuring that the valves of the same name are opened simultaneously. For an engine, more air needs to be sucked to improve dynamic property (improve the valve lift) at a high rotating speed, the valve lift can be reduced at a low speed, less air is sucked, and the economy is improved.
As shown in fig. 1, fig. 1 is a schematic structural diagram of a valve bridge integrated check valve in the prior art. The piston 2 'is arranged in a gate bridge 1' of the valve bridge and is limited by a positioning pin 4 'in a way of sliding up and down, the top of the piston 2' is supported by a spring 3 ', and a screw 6' is used for plugging a steel ball 5 'in a mounting cavity of the spring 3' to form a one-way valve structure. A valve is arranged below the piston 2'. When the valve is suddenly opened by pressure wave of a certain air channel, the piston 2 ' moves downwards, the volume above the piston 2 ' is increased, hydraulic oil opens the one-way valve to enter the position above the piston 2 ', hydraulic rigid connection is established, the valve is always kept at an opened position, and therefore air in the cylinder is discharged along with the air, and braking in the cylinder is achieved. The piston in the valve bridge with the structure passively moves under the influence of the external environment, and the variable valve lift cannot be realized.
Therefore, how to realize variable control of the pressure of the piston oil path is a problem to be solved urgently by those skilled in the art.
Disclosure of Invention
In view of the above, the present invention provides a hydraulic control unit to variably control the pressure of a piston oil path; the invention also provides an engine and a valve bridge.
In order to achieve the purpose, the invention provides the following technical scheme:
a hydraulic control unit comprises a valve body, wherein an oil way switching channel is formed in the valve body, and a first oil inlet communicated to the oil way switching channel is formed in the top of the valve body;
a spring seat is erected at the bottom of the oil way switching channel, a first compression spring erected on the spring seat and a valve core erected at the top of the first compression spring are erected;
the valve core comprises a plunger which is arranged in the oil path switching channel in a sliding manner, a second oil inlet hole communicated with the first oil inlet hole is formed in the top of the plunger, and a valve ball spring which are matched with the second oil inlet hole in a sealing manner are arranged in the plunger;
the side wall of the plunger is provided with a third oil inlet communicated with the valve ball sliding channel, the valve body is provided with a first oil discharge channel communicated with the oil circuit switching channel, and the spring seat is provided with a second oil discharge channel communicated with the oil circuit switching channel;
the plunger comprises an oil discharge top dead center which moves upwards to conduct the first oil discharge channel and the second oil discharge channel, and an oil inlet bottom dead center which moves downwards to conduct the third oil inlet hole and the first oil discharge channel.
Preferably, in the above hydraulic control unit, a valve ball sliding passage is provided in the plunger, and a valve ball seat that supports the valve ball spring and the valve ball is provided in the valve ball sliding passage.
Preferably, in the hydraulic control unit, a spring expansion hole for accommodating the valve ball spring and guiding expansion and contraction of the valve ball spring is formed at the top of the valve ball seat, and a gradually expanding limiting port for limiting the ascending and descending of the valve ball is formed at a valve ball supporting end of the spring expansion hole.
Preferably, in the hydraulic control unit, a limiting boss clamped in the first compression spring inner ring extends from the bottom of the valve seat and the support end of the spring seat.
Preferably, in the hydraulic control unit, a retainer ring for supporting the spring seat is provided on an inner wall of the oil passage switching passage mounting end, and the second oil discharge passage is provided in a middle portion of the spring seat.
Preferably, in the hydraulic control unit, a cross-shaped oil groove communicated with the second oil inlet hole is formed at the top of the plunger.
The valve bridge comprises a valve bridge body and a valve bridge piston arranged in the valve bridge body, the valve bridge body is also internally provided with the hydraulic control unit, and the first oil discharge channel is communicated to the piston spring accommodating cavity of the valve bridge piston.
Preferably, in the above valve bridge, the valve bridge piston includes a first piston and a second piston respectively provided at both ends of the valve bridge body, and the first oil discharge passage communicates the first piston and the second piston;
the hydraulic control unit is arranged in the middle of the valve bridge body, and the third oil inlet hole penetrates through the radial direction of the plunger.
Preferably, in the above valve bridge, the first oil discharge passage is an oil discharge through hole penetrating the valve bridge body in the length direction, and steel balls for plugging the oil discharge through hole are disposed at both ends of the oil discharge through hole.
An engine is provided with a valve bridge for controlling a valve, wherein the valve bridge is the valve bridge as described in any one of the above items;
the valve bridge further comprises an oil inlet pipeline communicated with the first oil inlet hole of the valve bridge and an oil discharge pipeline communicated with the second oil discharge channel.
The hydraulic control unit comprises a valve body, wherein an oil way switching channel is formed in the valve body, and a first oil inlet communicated to the oil way switching channel is formed in the top of the valve body; the bottom of the oil path switching channel is provided with a spring seat, a first compression spring mounted on the spring seat and a valve core mounted at the top of the first compression spring. The valve core is positioned in the valve body and slides up and down by compressing the first compression spring, the top of the valve body is provided with a first oil inlet, oil provides oil pressure for the top of the valve core to push the valve core to move down, the valve core is loaded from the bottom of the oil path switching channel and is blocked and supported by the spring seat.
The valve core comprises a plunger which is arranged in the oil path switching channel in a sliding manner, a second oil inlet hole communicated with the first oil inlet hole is formed in the top of the plunger, and a valve ball spring which are matched with the second oil inlet hole in a sealing manner are arranged in the plunger; the valve core is in sliding fit with the inner wall of the oil way switching channel through a plunger, a valve ball and a valve ball spring structure are arranged in the plunger, and a one-way valve structure is formed through a second oil inlet hole formed in the top of the plunger.
The lateral wall of plunger is seted up the third oil inlet that communicates the ball passageway that slides, sets up the first oil discharge passageway that communicates oil circuit switching passageway on the valve body, sets up the second oil discharge passageway that communicates oil circuit switching passageway on the spring holder. And a third oil inlet hole is formed in the side wall of the plunger, the plunger slides in the oil path switching channel, and when the third oil inlet hole is blocked by the inner wall of the oil path switching channel, oil is filled in the first oil inlet hole, the second oil inlet hole and the third oil inlet hole. And the spring seat is provided with a second oil discharge channel communicated with the second oil discharge channel to discharge the hydraulic oil in the valve body.
The plunger comprises an oil discharge top dead center which moves upwards to conduct the first oil discharge channel and the second oil discharge channel, and an oil inlet bottom dead center which moves downwards to conduct the third oil inlet hole and the first oil discharge channel. The plunger is provided with compression power by hydraulic oil conveyed by the first oil inlet hole in the top of the valve body, the plunger compresses the first compression spring to move downwards, and after the top oil pressure is lost, the first compression spring pushes the plunger to move upwards. When the plunger is positioned at the oil discharge top dead center, the first oil discharge channel is communicated to the bottom of the plunger, and oil in the first oil discharge channel flows into the second oil discharge channel from the bottom of the plunger and is discharged. When the plunger moves downwards, the side wall of the plunger plugs the first oil discharge channel, when the plunger moves downwards to the third oil inlet hole and is communicated with the first oil discharge channel, oil on the top of the plunger pushes the valve ball to move downwards, the oil enters the first oil discharge channel, the oil pressure in the first oil discharge channel is increased, after the oil pressure disappears, the first compression spring pushes the plunger to move upwards, and the oil pressure in the first oil discharge channel and the oil pressure in the second oil discharge channel are restored to be consistent. The valve body is internally provided with a double-layer one-way valve structure formed by a valve core and a valve ball structure in the valve core, the switching of different oil pressures in a first oil discharge channel is realized by controlling the oil pressures at the two ends of the first oil inlet hole and the second oil discharge channel of the valve body, and the variable switching of different pressures of a driving structure is realized.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a valve bridge integrated check valve in the prior art;
FIG. 2 is a schematic structural diagram of a valve bridge integrated hydraulic control unit provided by the invention;
FIG. 3 is a cross-sectional view of the internal oil passage structure of the valve bridge of FIG. 2;
FIG. 4 is a cross-sectional structural view of the valve cartridge of FIG. 2;
FIG. 5 is a cross-sectional view of the plunger of FIG. 4;
fig. 6 is a schematic top view of the plunger of fig. 5.
Detailed Description
The invention discloses a hydraulic control unit, which realizes variable control of the pressure of a piston oil way; the invention also provides an engine and a valve bridge.
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 2-6, fig. 2 is a schematic structural diagram of a valve bridge integrated hydraulic control unit provided by the invention; FIG. 3 is a cross-sectional view of the internal oil passage structure of the valve bridge of FIG. 2; FIG. 4 is a cross-sectional structural view of the valve cartridge of FIG. 2; FIG. 5 is a cross-sectional view of the plunger of FIG. 4; fig. 6 is a schematic top view of the plunger of fig. 5.
The invention provides a hydraulic control unit, which comprises a valve body 1, wherein an oil way switching channel 102 is formed in the valve body 1, and a first oil inlet hole 101 communicated to the oil way switching channel 102 is formed in the top of the valve body 1; the bottom of the oil path switching channel 102 is provided with a spring seat 8, a first compression spring 6 mounted on the spring seat 8 and a valve core 2 mounted on the top of the first compression spring 6. The valve core 2 is positioned in the valve body 1, the first compression spring 6 is compressed to slide up and down, the first oil inlet 101 is formed in the top of the valve body 1, oil provides oil pressure for the top of the valve core 2 to push the valve core 2 to move down, the valve core 2 is installed from the bottom of the oil way switching channel 102, and the valve core 2 is plugged and supported by the spring seat 8.
The valve core 2 comprises a plunger 201 which is arranged in the oil path switching channel 102 in a sliding manner, a second oil inlet hole 211 communicated with the first oil inlet hole 101 is formed in the top of the plunger 201, and a valve ball 202 and a valve ball spring 203 which are matched with the second oil inlet hole 211 in a sealing manner are arranged inside the plunger 201; the valve core 2 is in sliding fit with the inner wall of the oil path switching channel 102 through a plunger 201, a valve ball 202 and a valve ball spring 203 structure are arranged in the plunger 201, and a one-way valve structure is formed through a second oil inlet hole 211 formed in the top of the plunger 201.
The side wall of the plunger 201 is provided with a third oil inlet hole 213 communicated with the ball sliding channel 212, the valve body 1 is provided with a first oil discharge channel 104 communicated with the oil channel switching channel 102, and the spring seat 8 is provided with a second oil discharge channel communicated with the oil channel switching channel 102. The third oil inlet hole 213 is formed in the side wall of the plunger 201, the plunger 201 slides in the oil passage switching passage 102, and when the third oil inlet hole 213 is closed by the inner wall of the oil passage switching passage 102, the oil is filled in the first oil inlet hole 101, the second oil inlet hole 211, and the third oil inlet hole 213. And the spring seat 8 is provided with a second oil discharge channel for discharging oil in the valve body 1.
The plunger 201 includes an oil discharge top dead center that moves up to communicate with the first oil discharge passage 104 and the second oil discharge passage, and an oil intake bottom dead center that moves down to communicate with the third oil intake hole 213 and the first oil discharge passage 104. The plunger 201 is provided with compression power by oil liquid delivered by the first oil inlet hole 211 on the top of the valve body 1, the plunger 201 compresses the first compression spring 6 to move downwards, and after the oil pressure on the top of the plunger 201 loses pressure, the first compression spring 6 pushes the plunger 201 to move upwards. When the plunger 201 is at the top dead center for oil discharge, the first oil discharge channel 104 is communicated to the bottom of the plunger 201, and at the moment, oil in the first oil discharge channel 104 flows into the second oil discharge channel from the bottom of the plunger 201 and is discharged. When the plunger 201 moves downwards, the side wall of the plunger 201 seals the first oil discharge passage 104, when the plunger 201 moves downwards to the third oil inlet hole 213 and is communicated with the first oil discharge passage 104, oil on the top of the plunger 201 pushes the valve ball 202 to move downwards, the oil enters the first oil discharge passage 104 to increase the oil pressure in the first oil discharge passage, after the oil pressure disappears, the first compression spring 6 pushes the plunger 201 to move upwards, and the oil pressure in the first oil discharge passage 104 and the oil pressure in the second oil discharge passage return to be consistent. The valve body 1 is internally provided with a double-layer one-way valve structure formed by a valve core 2 and a valve ball 202 structure in the valve core 2, and the switching of different oil pressures in the first oil discharge channel 104 and the variable switching of different pressures of a driving structure can be realized through the oil pressure control at two ends of the first oil inlet hole 101 and the second oil discharge channel of the valve body 1.
In one embodiment, a ball slide passage 212 is provided in the plunger 201, and a ball seat 204 is provided in the ball slide passage 212 to support the ball spring 203 and the ball 202. The ball 202 is supported by a ball spring 203, and forms a check valve structure for blocking the second oil inlet hole 211 in the plunger 201. A ball slide passage 212 is formed in the plunger 201, and the ball 202 and the ball spring 203 are supported by a ball seat 204. Valve ball seat 204 is installed in the valve ball sliding channel 212 of plunger 201, and in order to guarantee stable in structure, but the two passageway threaded structure connect, valve ball seat 204 is packed into valve ball sliding channel 212 by plunger 201 bottom in, sets up to the screw hole in the valve ball sliding channel 212, guarantees valve ball seat 204 connection structure's stability and leakproofness.
In an embodiment of the present invention, a spring expansion hole 205 for accommodating the ball spring 203 and guiding expansion and contraction of the ball spring 203 is formed at the top of the ball seat 204, and a gradually expanding limiting opening 206 for limiting the ascending and descending of the ball 202 is formed at a ball supporting end of the spring expansion hole 205. Plunger 201 inner structure space is less, for guaranteeing the stability of valve ball 202 the gliding direction in plunger 201 to effectively seal to second inlet port 211, set up spring telescopic hole 205 at the top of valve ball seat 204, its aperture and valve ball spring 203 clearance fit, thereby effectively avoid valve ball 202 to cause the slope of valve ball spring 203 to the extrusion of valve ball spring 203. Meanwhile, in order to avoid that the valve ball 202 is impacted by input oil in the second oil inlet hole 211 and attached to the inner wall of the valve ball sliding channel 212, the influence on the discharge of the oil from the third oil inlet hole 213 is avoided, the top of the valve ball seat 204 is provided with a gradually-expanded limiting port 206 coaxially arranged with the spring telescopic hole 205, so that the end part of the spring telescopic hole 205 is of a bell-mouth structure, and through reasonably designing the sliding distance of the valve ball 202, the valve ball directly falls into the gradually-expanded limiting port 206 when moving downwards, so that the oil can be smoothly filled in the valve ball sliding channel 212.
In an embodiment of the present invention, the bottom of the valve ball seat 204 and the support end of the spring seat 8 are extended with a limit boss clamped to the inner ring of the first compression spring 6. The first compression spring 6 supports the valve core 2, pushes the valve core 2 to slide up and down, the bottom of the first compression spring is supported by the spring seat 8, and the top of the first compression spring is abutted against the valve ball seat 204. The bottom of the valve ball seat 204 and the supporting end of the spring seat 8 are both provided with a limiting boss of a protruding structure, the limiting boss extends into the inner ring of the first compression spring 6 and forms a clamping limiting structure with the first compression spring 6, and therefore the stability of the compression structure of the first compression spring 6 is improved.
In an embodiment of the present disclosure, a retainer ring 7 for supporting a spring seat is disposed on an inner wall of the mounting end of the oil passage switching passage 102, and the second oil discharge passage is opened in a middle portion of the spring seat 8. The spring seat 8 is installed from the bottom of the oil passage switching passage 102, and needs to ensure stable support of the valve element 2. An annular groove 103 is formed at the mounting end of the oil path switching channel 102, a retainer ring 7 is arranged in the annular groove 103 in a clamping mode, and the retainer ring 7 supports the spring seat 8. The edge of spring holder 8 is erect to retaining ring 7 structure and is propped, offers the middle part of spring holder 8 with second oil extraction passageway, avoids producing with the bearing structure of spring holder 8 and interferes, guarantees the support strength at spring holder 8 edge.
In an embodiment of the present disclosure, a cross-shaped oil groove 215 communicating with the second oil inlet 211 is formed at the top of the plunger 201. In the plunger structure of the valve core 2, the oil input through the first oil inlet 211 at the top of the valve body 1 extrudes the top of the plunger 201 to push the valve core 2 to move downwards. In order to avoid the adhesion of the top of the valve element 2 and the top wall of the oil path switching channel 102 and increase the pushing difficulty of the plunger 201, the cross-shaped oil groove 102 is formed in the top of the plunger 201, and after the oil input from the first oil inlet 101 is filled into the cross-shaped oil groove 215, the contact area between the oil and the top of the plunger 201 is increased, and the pushing difficulty is reduced.
It should be noted that the hydraulic control unit is applied to a valve bridge, a valve bridge body is a valve body of the hydraulic control unit, and the valve bridge body is described below by using the same reference numerals as the valve body, and no repeated marks are provided.
Based on the hydraulic control unit, the invention further provides a valve bridge, which comprises a valve bridge body 1 and a valve bridge piston 5 arranged in the valve bridge body 1, the hydraulic control unit is further arranged in the valve bridge body 1, and the first oil discharge channel 104 is communicated with the accommodating cavity of the piston spring 4 of the valve bridge piston 5.
The valve bridge realizes variable control of the valve stroke by pushing a valve bridge piston 5. A hydraulic control unit is provided in the valve bridge body 1 and communicates the first oil drain passage 104 with the valve bridge piston 5. When the plunger 201 of the hydraulic control unit moves downwards, high-pressure oil is controlled to be fed into the first oil inlet 101 from the top of the valve bridge body 1, the oil pushes the plunger 201 to move downwards until the third oil inlet hole 213 is communicated with the first oil discharge channel 104, the high-pressure oil is fed into the first oil discharge channel 104 through the second oil inlet hole 211 and the third oil inlet hole 213, the high-pressure oil is filled into the piston spring accommodating cavity 105 at the top of the valve bridge piston 5 to push the valve bridge piston 5 to move downwards, and the valve stroke is lengthened. In practical application, the oil pressure introduced into the first oil discharge passage 104 is not greater than the elastic force of the valve rod spring, a valve clearance is reserved above the valve bridge, and the pushing of the valve bridge piston 5 to move downwards is realized in the engine to push the valve bridge to float upwards.
After the high-pressure oil stops supplying, the first compression spring 6 pushes the plunger 201 to move upwards until the first oil discharge channel 104 and the second oil discharge channel are communicated, the high-pressure oil is led out from the second oil discharge channel, the valve bridge piston 5 is driven to return to the initial position, and the valve stroke is shortened. By integrating the hydraulic control unit with the valve bridge, the stroke of the valve bridge piston 5 is made variable, achieving in-cylinder braking. Meanwhile, the change of the valve stroke is actively controlled by the hydraulic control unit, so that the working hardness of the valve caused by the change of the external environment is avoided, and the working stability is improved.
In one embodiment of the present disclosure, the valve bridge piston 5 includes a first piston and a second piston respectively disposed at two ends of the valve bridge body, and the first oil discharge passage 104 communicates the first piston and the second piston; the hydraulic control unit is disposed in the middle of the valve bridge body 1, and the third oil inlet hole 213 penetrates the plunger 201 in the radial direction.
For a four-valve engine, the valve bridge is driven by a rocker arm, and two valves with the same name can be opened simultaneously. The valve bridge that provides in this embodiment is for being applied to four valve engine's valve bridge, and the valve bridge is including being located first piston and the second piston at its length direction both ends, and the middle part through the driving valve bridge drives and plays the action. In order to facilitate oil circuit arrangement, the hydraulic control unit is arranged in the middle of the valve bridge body 1, so the third oil inlet hole 213 needs to provide oil liquid transmitted to two ends of the valve bridge in the length direction at the same time, the first oil discharge passage 104 penetrates through the length direction of the valve bridge, the third oil inlet hole 213 is arranged to be a through hole which is radially arranged along the plunger 201 and communicated with the valve ball sliding passage 212, and oil liquid transmission in two directions of the valve bridge is achieved at the same time.
In this embodiment, the first oil drainage channel 104 is an oil drainage through hole penetrating the length direction of the valve bridge body 1, and the two ends of the oil drainage through hole are both provided with steel balls 3 for plugging the oil drainage through hole. Run through the length direction of valve bridge body 1 with first oil discharge passageway 104, for the oil extraction through-hole structure, reduce the processing degree of difficulty. The two ends of the oil discharge through hole are plugged by steel balls, and the middle part of the oil discharge through hole is enclosed to form a first oil discharge channel for conveying oil.
Based on the valve bridge provided in the above embodiment, the invention also provides an engine, in which a valve bridge for controlling a valve is arranged, and the valve bridge arranged on the engine is the valve bridge provided in the above embodiment. The engine is internally provided with an oil inlet pipeline communicated with a first oil inlet hole of the valve bridge and an oil discharge pipeline communicated with a second oil discharge channel, when the valve stroke needs to be increased, enough oil pressure in the oil inlet pipeline is improved, otherwise, the oil inlet is closed, and oil is discharged through the oil discharge pipeline.
When the engine works, the stroke change of the valve bridge piston is controlled by the hydraulic control unit in the valve bridge, and the specific working process of the engine is directly influenced by the working state of the engine.
Specifically, when the engine is at low speed, no oil flows into the valve bridge, and the inside of the valve bridge is rigidly connected with the valve.
When the rotating speed of the transmitter exceeds a set value, the valve bridge oil inlet pipeline is opened, high-pressure oil is introduced from the first oil inlet hole 101, the oil pressure in the cross-shaped oil groove 215 is greater than the elastic force of the first compression spring 6, the hydraulic control unit is pushed to move downwards, the valve ball 202 falls on the valve ball seat 204 under the action of the oil pressure, and the high-pressure oil is filled in the valve ball sliding channel 212.
When the hydraulic control unit moves down to the third oil inlet hole 213 and is communicated with the first oil discharge channel 104, high-pressure oil flows into the upper part of the valve bridge piston 5, and due to the action of oil pressure, a certain valve clearance is reserved between the upper part of the valve bridge and the rocker arm, the valve bridge pushes the valve bridge piston to act, the valve bridge can drive the hydraulic control unit to float upwards, the valve clearance is compensated, the height of the valve bridge is increased at the moment, and the valve lift is indirectly increased.
After the internal oil pressure of the valve bridge is stabilized, the valve ball 202 is pushed to return by the valve ball spring 203 under the action of the internal oil pressure, and the second oil inlet hole 211 is closed.
When the oil inlet pipeline is closed, the pressure on the top of the valve core 2 of the hydraulic control unit disappears, the first compression spring 6 pushes the valve core 2 to move upwards until the first oil discharge channel 104 is communicated with the second oil discharge channel, oil is discharged, the valve bridge sinks, and the valve bridge piston returns to the original position.
Because the engine adopts the valve bridge of the embodiment, please refer to the embodiment for the beneficial effects brought by the valve bridge of the engine.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (8)
1. A hydraulic control unit is characterized by comprising a valve body, wherein an oil way switching channel is formed in the valve body, and a first oil inlet communicated to the oil way switching channel is formed in the top of the valve body;
a spring seat is erected at the bottom of the oil way switching channel, a first compression spring erected on the spring seat and a valve core erected at the top of the first compression spring are erected;
the valve core comprises a plunger which is arranged in the oil path switching channel in a sliding manner, a second oil inlet hole communicated with the first oil inlet hole is formed in the top of the plunger, and a valve ball spring which are matched with the second oil inlet hole in a sealing manner are arranged in the plunger;
a valve ball sliding channel is arranged in the plunger, and a valve ball seat for supporting the valve ball spring and the valve ball is arranged in the valve ball sliding channel;
the top of the valve ball seat is provided with a spring telescopic hole which is used for accommodating the valve ball spring and guiding the expansion of the valve ball spring;
the bottom of the valve ball seat and the supporting end of the spring seat extend out of limiting bosses clamped on the inner ring of the first compression spring;
the side wall of the plunger is provided with a third oil inlet communicated with the valve ball sliding channel, the valve body is provided with a first oil discharge channel communicated with the oil circuit switching channel, and the spring seat is provided with a second oil discharge channel communicated with the oil circuit switching channel;
the plunger comprises an oil discharge top dead center which moves upwards to conduct the first oil discharge channel and the second oil discharge channel, and an oil inlet bottom dead center which moves downwards to conduct the third oil inlet hole and the first oil discharge channel.
2. The hydraulic control unit according to claim 1, wherein a valve ball support end of the spring telescopic hole is provided with a gradually expanding limiting port for limiting the lifting of the valve ball.
3. The hydraulic control unit according to claim 1, wherein a retainer ring that supports the spring seat is provided on an inner wall of the oil passage switching passage mounting end, and the second oil discharge passage is opened in a middle portion of the spring seat.
4. The hydraulic control unit according to claim 1, wherein a cross-shaped oil groove communicating with the second oil inlet hole is opened at a top portion of the plunger.
5. A valve bridge, comprising a valve bridge body and a valve bridge piston arranged in the valve bridge body, wherein the valve bridge body is also internally provided with a hydraulic control unit according to any one of claims 1 to 4, and the first oil discharge passage is communicated with a piston spring accommodating cavity of the valve bridge piston.
6. The valve bridge of claim 5, wherein the valve bridge piston comprises a first piston and a second piston disposed at opposite ends of the valve bridge body, respectively, the first oil drain passage communicating the first piston and the second piston;
the hydraulic control unit is arranged in the middle of the valve bridge body, and the third oil inlet hole penetrates through the radial direction of the plunger.
7. The valve bridge of claim 6, wherein the first oil drainage channel is an oil drainage through hole penetrating the length direction of the valve bridge body, and steel balls for plugging the oil drainage through hole are arranged at two ends of the oil drainage through hole.
8. An engine having a valve bridge for controlling a valve, the valve bridge being as claimed in any one of claims 5 to 7;
the valve bridge further comprises an oil inlet pipeline communicated with the first oil inlet hole of the valve bridge and an oil discharge pipeline communicated with the second oil discharge channel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810234276.4A CN110295960B (en) | 2018-03-21 | 2018-03-21 | Hydraulic control unit, valve bridge and engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810234276.4A CN110295960B (en) | 2018-03-21 | 2018-03-21 | Hydraulic control unit, valve bridge and engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110295960A CN110295960A (en) | 2019-10-01 |
| CN110295960B true CN110295960B (en) | 2020-10-30 |
Family
ID=68025392
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810234276.4A Active CN110295960B (en) | 2018-03-21 | 2018-03-21 | Hydraulic control unit, valve bridge and engine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110295960B (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4924821A (en) * | 1988-12-22 | 1990-05-15 | General Motors Corporation | Hydraulic lash adjuster and bridge assembly |
| CN202017536U (en) * | 2011-03-16 | 2011-10-26 | 奚勇 | Device for braking engine by using valve bridge |
| CN106715842A (en) * | 2014-09-18 | 2017-05-24 | 雅各布斯车辆系统公司 | Lost motion assembly in a valve bridge for use with a valve train comprising a hydraulic lash adjuster |
| WO2018025152A1 (en) * | 2016-08-05 | 2018-02-08 | Gnutti Carlo S.P.A. | Hydraulic tappet |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101194145B1 (en) * | 2004-03-15 | 2012-10-23 | 자콥스 비히클 시스템즈, 인코포레이티드. | Valve bridge with integrated lost motion system |
| DE102015211124A1 (en) * | 2015-06-17 | 2016-12-22 | Schaeffler Technologies AG & Co. KG | Valve gear of a reciprocating internal combustion engine |
| US10094250B2 (en) * | 2016-08-18 | 2018-10-09 | Progress Rail Locomotive Inc. | Valve bridge with internal oil transportation |
-
2018
- 2018-03-21 CN CN201810234276.4A patent/CN110295960B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4924821A (en) * | 1988-12-22 | 1990-05-15 | General Motors Corporation | Hydraulic lash adjuster and bridge assembly |
| CN202017536U (en) * | 2011-03-16 | 2011-10-26 | 奚勇 | Device for braking engine by using valve bridge |
| CN106715842A (en) * | 2014-09-18 | 2017-05-24 | 雅各布斯车辆系统公司 | Lost motion assembly in a valve bridge for use with a valve train comprising a hydraulic lash adjuster |
| WO2018025152A1 (en) * | 2016-08-05 | 2018-02-08 | Gnutti Carlo S.P.A. | Hydraulic tappet |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110295960A (en) | 2019-10-01 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN201443440U (en) | Variable compression ratio piston | |
| GB2028953A (en) | An Internal Combustion Engine with Exhaust Braking | |
| CN110295960B (en) | Hydraulic control unit, valve bridge and engine | |
| CN115539164A (en) | Lost motion variable valve actuation system and method | |
| CN201588837U (en) | Two-stage sleeve oil cylinder with oil intake on center of top cylinder | |
| CN108661744B (en) | Engine intake valve continuous variable system and engine | |
| CN111058916A (en) | Compression release in-cylinder brake system for engine | |
| CN209244627U (en) | Multistage draining exhaust valve | |
| CN211448786U (en) | Compression release in-cylinder brake system for engine | |
| WO2008076702A3 (en) | Oiler pump | |
| KR101875646B1 (en) | Variable compression ratio device | |
| CN211666789U (en) | Compression release in-cylinder brake system for engine | |
| CN209638751U (en) | A kind of pressurization air-operated lubricating pump | |
| CN108612681B (en) | Hydraulic booster pump | |
| CN207470522U (en) | A kind of machinery total travel self-locking hydraulic cylinder | |
| EP3901426A1 (en) | Valve train and engine | |
| CN108868936B (en) | High-compactness hydraulic tappet of internal combustion engine | |
| CN2366617Y (en) | Oil sealing type gate valve | |
| CN110295961B (en) | Valve bridge and four-valve engine | |
| CN211448787U (en) | Compression release in-cylinder brake system for engine | |
| CN213598032U (en) | Plunger type pressure limiting valve | |
| CN211733716U (en) | Oil pump throttling mechanism of jack | |
| CN220748469U (en) | Reciprocating integrated plunger pump structure | |
| CN201884355U (en) | Hydraulic controlled high flow lifting distribution valve for large-sized mining electric wheel dumper | |
| CN220365795U (en) | Double-acting multistage hydraulic cylinder and hydraulic driving device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |