CN110173314A - A kind of air valve bridge and its exhaust brake method of achievable compression-release type engine braking - Google Patents
A kind of air valve bridge and its exhaust brake method of achievable compression-release type engine braking Download PDFInfo
- Publication number
- CN110173314A CN110173314A CN201910406432.5A CN201910406432A CN110173314A CN 110173314 A CN110173314 A CN 110173314A CN 201910406432 A CN201910406432 A CN 201910406432A CN 110173314 A CN110173314 A CN 110173314A
- Authority
- CN
- China
- Prior art keywords
- plunger
- oil
- active
- air valve
- active plunger
- 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.)
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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
- F01L1/26—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
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- 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
- F01L13/00—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
- F01L13/06—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for braking
- F01L13/065—Compression release engine retarders of the "Jacobs Manufacturing" type
-
- 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
- F01L9/00—Valve-gear or valve arrangements actuated non-mechanically
- F01L9/10—Valve-gear or valve arrangements actuated non-mechanically by fluid means, e.g. hydraulic
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D13/00—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing
- F02D13/02—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing during engine operation
- F02D13/04—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing during engine operation using engine as brake
Abstract
The invention patent relates to engine braking technical fields, and in particular to a kind of air valve bridge and its exhaust brake method of achievable compression-release type engine braking.Air valve bridge mainly includes air valve bridge ontology, check valve, active plunger and driven plunger.Air valve bridge ontology is equipped with the first plunger cavity of installation active plunger, the second plunger cavity of the driven plunger of installation, emptying oil duct and connection oil duct.Active plunger body is equipped with check valve, and active plunger is equipped with active plunger emptying channel.Elastic component and active plunger oil pocket are equipped between active plunger and the first plunger cavity, active plunger oil pocket is connected to active plunger emptying channel.Connection oil duct is connected to active plunger oil pocket, driven plunger oil pocket.Exhaust valve normal work had both may be implemented in air valve bridge exhaust brake method provided by the invention under same cam, can also realize compression-release type engine braking function.
Description
Technical field
The invention patent relates to engine braking technical fields, and in particular to a kind of achievable compression-release type starts mechanism
Dynamic air valve bridge and its exhaust brake method.
Background technique
Compression-release type engine braking is a kind of engine braking technology for comparing mainstream instantly, and braking power is larger,
Some commercial vehicles are usually applied to, such as during long descending, open control switch, stopped oil and stop working, engine towing astern is living
Exhaust valve is opened when the plug compression stroke later period is close near top dead center, high pressure gas is discharged, so that most of compressed gas absorbs
Energy be discharged.Compression-release type engine braking realizes braking effect by energy consumption.
One precedent of engine braking apparatus be american commings (Cummins) in nineteen sixty-five in U.S. Patent number
The hydraulic engine brake disclosed in 3220392.Mechanical input is transmitted to and to be opened by hydraulic circuit in the technology
Exhaust valve.It is typically included in the main piston moved back and forth in master piston bore on hydraulic circuit, the reciprocating motion is from starting
The mechanical input of machine keeps it living in pair if the movement of the shake of injector rocker arm, main piston is transmitted to auxiliary piston by hydraulic fluid
It is moved back and forth in consent, auxiliary piston directly or indirectly acts on exhaust valve, generates the valve actuation of engine braking running.
Summary of the invention
It is an object of that present invention to provide a kind of air valve bridge of achievable compression-release type engine braking and its exhaust systems
Dynamic method, structure is simple, and exhaust valve normal work both may be implemented under same cam, can also realize that compression-release type is started
Machine braking function.
The present invention discloses a kind of air valve bridge of achievable compression-release type engine braking, including air valve bridge sheet first
Body, check valve, active plunger and driven plunger；
The air valve bridge ontology is equipped with the second plunger of the first plunger cavity of installation active plunger, the driven plunger of installation
Chamber, emptying oil duct and connection oil duct；The active plunger body is equipped with check valve, and active plunger is equipped with active plunger emptying
Channel；Elastic component and active plunger oil pocket, active plunger oil pocket and master are equipped between the active plunger and the first plunger cavity
Dynamic plunger emptying channel connection；The connection oil duct is connected to active plunger oil pocket, driven plunger oil pocket；The active column
Plug can move up and down in the first plunger cavity；Movement of the active plunger in its stroke range will make air valve bridge be in unload oil condition
Oil condition is unloaded with non-, when air valve bridge, which is in, unloads oil condition, the emptying oil duct is connected to active plunger emptying channel, to make
Emptying oil duct is connected to oil duct is connect；When emptying oil duct and active plunger emptying channel are in non-interconnected state, at air valve bridge
Oil condition is unloaded in non-.
According to the present invention, described driven due to the effect of oil pressure when active plunger oil pocket is with connecting in oil duct full of oil
Plunger can moving downward and move downward due to active plunger.
According to the present invention, when the active plunger position is suitable, the connection oil duct can pass through active plunger oil unloading trough
It is conducted with emptying oil duct, to carry out emptying.
Preferably, the elastic component is to be connected between first plunger cavity bottom and the active plunger body
Spring.
Preferably, the connection oil duct is three circulation passages, and first port is connected to driven Plunger oil top of chamber；Second
Port is connected to active Plunger oil bottom of chamber portion；Third port is when air valve bridge is in and unloads oil condition through active plunger emptying channel
It is connected to emptying oil duct.
Preferably, the active plunger emptying channel is two ducts being provided on active plunger wall surface；Duct with
Active plunger oil pocket connection, when in unload oil condition when, one of duct is connected to emptying oil duct, another duct with connect
Oil duct connection.
The invention also discloses the exhaust brake methods of the air valve bridge described in one kind, the method is as follows: opens engine braking
Control switch, system start fuel feeding, and oil enters active plunger oil pocket by the check valve of active plunger body；When engine is in
When the compression stroke later period is close to top dead centre, due to the effect of cam face, the active plunger is moved downward, active plunger oil pocket
Rise with connection oil duct and driven Plunger oil chamber internal oil pressure, driven plunger is pushed to move down, open engine exhaust port, release is high
It calms the anger body；
When active plunger further moves down, connection oil duct is connected to emptying oil duct, and air valve bridge is in and unloads oil condition, is made described
Pressure oil in driven plunger oil pocket and active plunger oil pocket is drawn off, and oil pressure decline, driven plunger moves up return, and exhaust valve closes
It closes, the compression-release type engine braking process in the circulation is completed；After engine exhaust strokes, due to cam face
Effect, active plunger moves up return under the action of the elastic member, the intracavitary formation negative pressure of active Plunger oil, since systems stay supplies
Oil is prepared to enter into next circulation so that the intracavitary oil pressure of active Plunger oil restores.
Further, if closing engine braking control switch, fuel cut-off, then the intracavitary oil pressure of active Plunger oil is without Faville
It holds, when active plunger moves down, driven plunger is no longer moved down, and engine compression strokes late stage exhaust door will not be opened, compression release
Formula engine braking disabler, and opened after engine exhaust strokes are leaned on as foot and air valve bridge rigid contact exhaust valve then with
The engine of no exhaust brake function is no different.
Beneficial effects of the present invention: the air valve bridge of achievable compression-release type engine braking provided by the invention and its row
Gas braking method, ingenious in design, structure is simple, under same cam, if close engine braking, i.e., system not fuel feeding when, exhaust
Door can be no different with normal switch with the engine generally without exhaust brake function；If opening engine braking, when system fuel feeding,
Then can realize exhaust brake function in the engine compression strokes later period, and will not influence the exhaust valve timing of exhaust stroke with
Lift.
Detailed description of the invention
Fig. 1 is the air valve bridge structural schematic diagram of achievable compression-release type engine braking provided in an embodiment of the present invention；
Fig. 2 is in structural schematic diagram when exhaust brake condition for air valve bridge in the embodiment of the present invention；
Fig. 3 is that for air valve bridge in oil condition is unloaded, i.e. connection oil duct passes through active plunger emptying channel in the embodiment of the present invention
Structural schematic diagram when being conducted with emptying oil duct；
Fig. 4 is that the subsidiary bodies such as the cam matched with the embodiment of the present invention and rocker arm in air valve bridge are in exhaust brake
Cooperation schematic diagram when state；
Description of symbols: 1- check valve, 2- active plunger, 3- active plunger emptying channel, 4- active plunger oil pocket, 5- emptying
Oil duct, 6- connection oil duct, 7- plug, the driven plunger of 8-, 9- air valve bridge ontology, 10- elastic component, the first plunger cavity of 11-, 12-
Two plunger cavities, the driven plunger oil pocket of 13-, 14- is as foot, 15- adjusting screw, 16- rocker arm, 17- roller, 18- cam, 19- exhaust
Door.
Specific embodiment
The specific embodiment of the invention is described further with reference to the accompanying drawing.
It is as shown in Figure 1, 2, 3: a kind of air valve bridge of achievable compression-release type engine braking, mainly include check valve 1,
Active plunger 2, active plunger emptying channel 3, active plunger oil pocket 4, emptying oil duct 5, connection oil duct 6, plug 7, driven plunger
8, air valve bridge ontology 9, elastic component 10, the first plunger cavity 11, the second plunger cavity 12, driven plunger oil pocket 13.The air valve bridge
Ontology 9 is equipped with the second plunger cavity 12, the emptying oil duct 5 of the first plunger cavity 11 of installation active plunger 2, the driven plunger 8 of installation
With connection oil duct 6, there has been the plug 7 of sealing processing pore canal role on 9 surface of air valve bridge ontology.It is set inside the active plunger 2
There is check valve 1, active plunger 2 is equipped with active plunger emptying channel 3.Between the active plunger 2 and the first plunger cavity 11
Equipped with elastic component 10 and active plunger oil pocket 4, active plunger oil pocket 4 is connected to active plunger emptying channel 3.The connection oil
Road 6 is connected to active plunger oil pocket 4, driven plunger oil pocket 13.
Engine braking control switch is opened, system starts and continue fuel feeding, and oil enters active Plunger oil by check valve 1
Chamber 4 is full of and forms certain oil pressure.Driven plunger 8 keeps original position not move down still at this time, as shown in Figure 1.
When the engine compression strokes later period is close to top dead centre, due to the effect of 18 shape of cam, so that active plunger 2 starts
It moves down, since active plunger 2 moves down, the oil pressure in active plunger oil pocket 4 and connection oil duct 6 and driven plunger oil pocket 13 rises,
It pushes driven plunger 8 to move down, opens exhaust valve 19, discharge high pressure gas, as shown in Figure 2, Figure 4 shows.Active plunger 2 further under
First reach during shifting and unload oil condition, connection oil duct 6 is conducted by active plunger emptying channel 3 with emptying oil duct 5, pressure
Oil is flowed out from emptying oil duct 5, and the oil pressure decline in active plunger oil pocket 4 and connection oil duct 6, driven plunger 8 moves up return, is vented
Door 19 is closed, and the compression-release type engine braking process in the circulation is completed.Adjusting screw 15 is whole continue to move down until
As foot 14 and 9 rigid contact of air valve bridge ontology, at this time as shown in figure 3, entering expansion stroke later, under cylinder inner piston
It moves, since most of high pressure gas has been discharged, therefore piston moves down can also consume energy, is conducive to braking, later the row of being prepared to enter into
In the gas stage, due to the effect of 18 shape of cam, and as foot 14 and the holding rigid contact of air valve bridge 9, therefore exhaust valve 19 may be implemented
It normally early opens, evening closes.To play buffering effect, exhaust stroke terminates, as foot 14 and valve in the short time after exhaust valve 19 is closed
Bridge ontology 9 still keeps rigid contact, and active plunger 2 is moved up due to the effect of elastic component 10 later, then exits and unloads oil condition, main
Negative pressure is formed in dynamic plunger oil pocket 4, due to systems stay fuel feeding, oil pressure in active plunger oil pocket 4 can be made to restore, be ready to
Into next circulation.
If closing engine braking control switch, fuel cut-off, oil pressure is difficult to maintain in active plunger oil pocket 4, several
After circulation, i.e., active plunger 2 moves down and just no longer driven plunger 8 can be made to move down by oil pressure quickly, the engine compression strokes later period
Exhaust valve 19 will not be opened, compression-release type engine braking disabler, and by as foot 14 and 9 rigid contact of air valve bridge ontology
Exhaust valve 19 is opened afterwards to be then no different with the engine generally without exhaust brake function.
Finally, it should be noted that the above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although
Present invention has been described in detail with reference to the aforementioned embodiments, for those skilled in the art, can still have each
Kind modification.All any modification, equivalent replacement, improvement and so within spirit of the invention and principle, should be included in
Within protection scope of the present invention.
Claims (6)
1. a kind of air valve bridge of achievable compression-release type engine braking, it is characterised in that: including air valve bridge ontology, unidirectionally
Valve, active plunger and driven plunger；
The air valve bridge ontology be equipped with the first plunger cavity of installation active plunger, the driven plunger of installation the second plunger cavity,
Emptying oil duct and connection oil duct；The active plunger body is equipped with check valve, and active plunger is logical equipped with active plunger emptying
Road；Elastic component and active plunger oil pocket, active plunger oil pocket and active are equipped between the active plunger and the first plunger cavity
The connection of plunger emptying channel；The connection oil duct is connected to active plunger oil pocket, driven plunger oil pocket；The active plunger
It can move up and down in the first plunger cavity；Movement of the active plunger in its stroke range will make air valve bridge be in unload oil condition and
Non- to unload oil condition, when air valve bridge, which is in, unloads oil condition, the emptying oil duct is connected to active plunger emptying channel, to make to unload
Oil duct is connected to oil duct is connect；When emptying oil duct and active plunger emptying channel are in non-interconnected state, air valve bridge is in
It is non-to unload oil condition.
2. the air valve bridge of achievable compression-release type engine braking according to claim 1, it is characterised in that: described
Elastic component is the spring being connected between first plunger cavity bottom and the active plunger body.
3. the air valve bridge of achievable compression-release type engine braking according to claim 1, it is characterised in that: described
Connection oil duct is three circulation passages, and first port is connected to driven Plunger oil top of chamber；Second port and active Plunger oil bottom of chamber
Portion's connection；Third port is connected to by active plunger emptying channel with emptying oil duct when air valve bridge is in and unloads oil condition.
4. the air valve bridge of achievable compression-release type engine braking according to claim 1, it is characterised in that described
Active plunger emptying channel is two ducts being provided on active plunger wall surface；Duct is connected to active plunger oil pocket, works as place
When unloading oil condition, one of duct is connected to emptying oil duct, another duct is connected to oil duct is connect.
5. a kind of exhaust brake method using air valve bridge as described in claim 1, it is characterised in that: open engine braking
Control switch, system start fuel feeding, and oil enters active plunger oil pocket by the check valve of active plunger body；When engine is in
When the compression stroke later period is close to top dead centre, due to the effect of cam face, the active plunger is moved downward, active plunger oil pocket
Rise with connection oil duct and driven Plunger oil chamber internal oil pressure, driven plunger is pushed to move down, open engine exhaust port, release is high
It calms the anger body；
When active plunger further moves down, connection oil duct is connected to emptying oil duct, and air valve bridge is in and unloads oil condition, is made described driven
Pressure oil in plunger oil pocket and active plunger oil pocket is drawn off, oil pressure decline, and driven plunger moves up return, and exhaust valve closing should
Compression-release type engine braking process in circulation is completed；After engine exhaust strokes, due to the work of cam face
Return is moved up under the action of the elastic member with, active plunger, the intracavitary formation negative pressure of active Plunger oil, due to systems stay fuel feeding,
So that the intracavitary oil pressure of active Plunger oil restores, it is prepared to enter into next circulation.
6. the exhaust brake method of air valve bridge according to claim 5, it is characterised in that: if closing engine braking control
Switch, fuel cut-off, then the intracavitary oil pressure of active Plunger oil is unable to maintain that driven plunger no longer moves down when active plunger moves down,
Engine compression strokes late stage exhaust door will not be opened, compression-release type engine braking disabler, and in engine exhaust
Stroke, which is leaned on, to be no different as foot with engine of the exhaust valve then with no exhaust brake function is opened after air valve bridge rigid contact.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910406432.5A CN110173314B (en) | 2019-05-15 | 2019-05-15 | Valve bridge capable of realizing compression release type engine braking and exhaust braking method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910406432.5A CN110173314B (en) | 2019-05-15 | 2019-05-15 | Valve bridge capable of realizing compression release type engine braking and exhaust braking method thereof |
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| Publication Number | Publication Date |
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| CN110173314A true CN110173314A (en) | 2019-08-27 |
| CN110173314B CN110173314B (en) | 2023-07-18 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110566308A (en) * | 2019-09-03 | 2019-12-13 | 浙江大学 | reset slide valve type rocker arm mechanism for engine braking and braking method thereof |
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