CN101215980A - Engine brake device - Google Patents
Engine brake device Download PDFInfo
- Publication number
- CN101215980A CN101215980A CNA2007101920203A CN200710192020A CN101215980A CN 101215980 A CN101215980 A CN 101215980A CN A2007101920203 A CNA2007101920203 A CN A2007101920203A CN 200710192020 A CN200710192020 A CN 200710192020A CN 101215980 A CN101215980 A CN 101215980A
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- Prior art keywords
- cam
- exhaust valve
- major
- exhaust
- minor
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- 230000006835 compression Effects 0.000 claims description 10
- 238000007906 compression Methods 0.000 claims description 10
- 238000005265 energy consumption Methods 0.000 claims description 4
- 230000000694 effects Effects 0.000 abstract description 4
- 230000033001 locomotion Effects 0.000 description 11
- 238000000034 method Methods 0.000 description 5
- 230000005540 biological transmission Effects 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
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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
- F01L1/02—Valve drive
- F01L1/04—Valve drive by means of cams, camshafts, cam discs, eccentrics or the like
- F01L1/08—Shape of cams
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- Valve Device For Special Equipments (AREA)
Abstract
The invention belongs to the technical field of engine braking, in particular to an engine braking device. The invention brakes a diesel engine by using a double-cam mechanism and combining a variable rocking arm mechanism. During the course of braking the engine, the double cams, a main rocking arm and a secondary rocking arm cooperate to open an exhaust port and close the exhaust port twice, respectively in a working period of the engine. In this way, the piston of the engine does negative work and consumes energy all along to assist in braking. The invention has simple structure, sound durability, good braking effect and low dissipation of energy.
Description
Technical field
The invention belongs to the engine braking technical field, be specifically related to a kind of engine braking apparatus.
Background technique
Existing engine braking apparatus adopts machinery or hydraulic mechanism more, utilizes the valve of motor itself or oil sprayer driving cam as power source, thereby the exhaust valve of controlling motor is realized engine braking.But this engine brake is complex structure not only, and component number is many, is unfavorable for the layout of motor; And engine brake is when work, hydraulic medium is reciprocating in hydraulic pipe line, hydraulic medium can not get upgrading, each circulation can only replenish the hydraulic medium of leakage, in the using process of break, there is bubble unavoidably, this just might make the hydraulic pressure of foundation not reach the numerical value of design in advance, thereby makes misfunctioning of brake.
In order to change this situation, guarantee the driving safety of automobile, electric eddy current retarder has appearred.But since electric eddy current retarder be utilize electromagnetism be used for making car deceleration, so can might burn coil by a large amount of electric currents in the coil during operation, retarder was lost efficacy.Simultaneously because electric convolution needs a large amount of coils can reach the purpose that produces the electromagnetic resistance effect, so the volume of electric eddy current retarder and quality are all bigger, have increased the quality of transmission system thus, and the great quantity of small car can not be mated with the electric convolution device.
Summary of the invention
The purpose of this invention is to provide a kind of simple in structure, durable in use, engine braking apparatus that auxiliary braking is respond well.
For achieving the above object, the present invention has adopted following technological scheme: a kind of engine braking apparatus, comprise exhaust valve, the present invention includes be set to two-jawed exhaust cam shaft and major and minor rocking arm be in can in conjunction with or the variable rocker-arm mechanism of separated state;
Described double-cam comprises major and minor cam coaxial and that shift to install, and the dislocation angle of major and minor cam makes motor when braking state, and exhaust valve is opened exhaust to increase the energy consumption of motor between intake stroke and exhaust stroke;
Described major and minor rocking arm is in separated state when motor normally moves, be in bonding state when engine braking;
Described main cam drives master rocker, and auxiliary cam drives secondary-rocker.
Motor stops oil spout in braking process, the motor of this moment is equivalent to air compressor, owing to be provided with the double-cam and the major and minor rocker arm body of working in coordination among the present invention, shifting to install by major and minor cam again, thereby exhaust valve is in due course to be opened certain angle and time, to absorb the energy of piston motion, reach the prevention vehicle movement, the purpose of deceleration.Because only have the cooperation of double-cam and major and minor rocker arm body among the present invention, so it is simple in structure and durable in use, and braking effect is good, energy consumption is low.
Description of drawings
Fig. 1 is a system architecture schematic representation of the present invention;
Fig. 2 is the structural representation of twin cam shaft;
Fig. 3 is the A-A sectional view of Fig. 2
Fig. 4 is the stereoscopic-state figure of twin cam shaft;
Valve motion situation schematic representation when Fig. 5 is engine braking;
Fig. 6 is the structural representation of variable rocker-arm mechanism.
Embodiment
As shown in Figure 1, a kind of engine braking apparatus comprises exhaust valve 10, the present invention also comprise the exhaust cam shaft that is set to double-cam 20 and major and minor rocking arm 31,32 be in can in conjunction with or the variable rocker-arm mechanism of separated state;
Described double-cam 20 comprises major and minor cam 21,22 coaxial and that shift to install, the dislocation angle of major and minor cam 21,22 makes motor when braking state, and exhaust valve 10 is opened exhaust to increase the energy consumption of motor between intake stroke and exhaust stroke;
Described major and minor rocking arm 31,32 is in separated state when motor normally moves, be in bonding state when engine braking;
Described main cam 21 drives master rocker 31, and auxiliary cam 22 drives secondary-rocker 32.
Described exhaust cam shaft is double-cam 20 structures, and shown in Fig. 2,3,4, wherein main cam 21 all effectively turns round under motor normal mode of operation and braking mode, and this moment, main cam 21 promotion master rockers 31 were opened exhaust valve 10 in exhaust stroke; Though auxiliary cam 22 is in operating condition and promotes secondary-rocker 32 actions under the motor normal mode of operation, but because this moment, major and minor rocking arm 31,32 was in separated state, so auxiliary cam 22 is a lost motion, when motor is in braking mode, major and minor rocking arm 31,32 is in bonding state, auxiliary cam 22 effectively turns round, and opens exhaust valve 10 thereby promote secondary-rocker 32 between intake stroke and exhaust stroke.
Major and minor rocking arm 31,32 be in can in conjunction with or the variable rocker-arm mechanism of separated state multiple implementation is also arranged, be generally the solenoid-driven hydraulic mechanism, can be with reference to prior art.
More the choose opportunities of opening exhaust valve 10 makes piston make negative work extraly, thereby reaches the purpose of auxiliary braking for increasing the consumption of engine power.May be selected to be compression stroke latter stage or expansion space stroke initial stage the opportunity of this unlatching exhaust valve 10, when piston operates in this stage, exhaust valve 10 is opened, pressurized air is discharged from, at this moment can form certain degree of vacuum in the cylinder, this degree of vacuum will hinder the downward movement of piston, thereby consumes the energy of vehicle movement more, realizes purpose of the present invention.
As preferred version of the present invention, the dislocation angle of described major and minor cam 21,22 makes motor when braking state, and exhaust valve 10 is opened exhaust latter stage in compression stroke.
The choose opportunities of opening exhaust valve 10 is compression stroke latter stage, both can make piston finish compression stroke to consume the vehicle energy, near discharge section pressurized air in the time of again piston runs to top dead center, thereby form certain degree of vacuum in cylinder, this degree of vacuum will hinder the downward movement of piston in whole expansion space stroke.Compare at expansion space stroke and open exhaust valve 10 during the initial stage, compression stroke is opened exhaust valve 10 during latter stage can make vehicle consume more energy, more helps the auxiliary braking of vehicle.
As the present invention's preferred version further, exhaust valve 10 lifts that exhaust valve 10 lifts that described main cam 21 drives drive greater than auxiliary cam 22.
Below in conjunction with Fig. 5, running of the present invention is briefly introduced:
Among Fig. 4, I is an intake stroke, and II is a compression stroke, and III is compression stroke latter stage, and IV is for expanding or expansion space stroke, and V is an exhaust stroke.
When not needing engine braking, major and minor rocking arm the 31, the 32nd, separately.Main cam 21 in the double-cam 20 is operated in normal mode, main cam 21 drives master rocker 31 and then drives exhaust valve 10 motions in the operation process of motor, realize normal intake and exhaust, auxiliary cam 22 also can drive secondary-rocker 32 motions in the camshaft movement process, but because major and minor rocking arm the 31, the 32nd, separately, so secondary-rocker 32 can not act on the exhaust valve 10.
When the needs engine braking, major and minor rocking arm 31,32 combines under the effect of hydraulic mechanism.This moment, major and minor cam 21,22 can drive exhaust valve 10 by rocking arm.The exhaust valve 10 of motor will open twice in an operation cycle of motor like this, thereby realizes engine braking.
During at braking mode, intake valve 40 is opened in the intake stroke in engine operation, and exhaust valve 10 cuts out, and cylinder sucks air; Compression stroke early stage, exhaust valve 10 and intake valve 40 are closed simultaneously, and compression stroke latter stage, exhaust valve 10 is opened, and part pressurized air is discharged from, and at this moment can form certain degree of vacuum in the cylinder; In the expansion stroke, inlet and outlet door 40,10 is closed simultaneously, owing in the cylinder certain degree of vacuum is arranged, can stop descent of piston.In the exhaust stroke, exhaust valve 10 is opened, to stop piston stroking upward.
When motor will be got back to normal mode of operation once more, only need major and minor rocking arm was opened in 31,32 minutes, the motion that allows auxiliary cam 22 drive secondary-rockers 32 becomes that air transport is moving to get final product.
Described major and minor rocking arm 31,32 be in can in conjunction with or the variable rocker-arm mechanism of separated state, it has multiple implementation, rocker arm body such as German INA company, as shown in Figure 6, it realizes the combination or the separated state of major and minor rocking arm 31,32 by hydraulic mechanism, concrete principle can repeat no more referring to prior art herein.Reference character among Fig. 6 is explained as follows:
31-master rocker 32-secondary-rocker 6-exhaust valve 7-secondary-rocker return spring 8-rocking arm roller 9-lock pin 11-hydraulic tappet 12-oil duct 13-spring
Claims (3)
1. an engine braking apparatus comprises exhaust valve (10), it is characterized in that: the present invention also comprise the exhaust cam shaft that is set to double-cam (20) and major and minor rocking arm (31,32) be in can in conjunction with or the variable rocker-arm mechanism of separated state;
Described double-cam (20) comprises major and minor cam (21,22) coaxial and that shift to install, the dislocation angle of major and minor cam (21,22) makes motor when braking state, and exhaust valve (10) is opened exhaust to increase the energy consumption of motor between intake stroke and exhaust stroke;
Described major and minor rocking arm (31,32) is in separated state when motor normally moves, be in bonding state when engine braking;
Described main cam (21) drives master rocker (31), and auxiliary cam (22) drives secondary-rocker (32).
2. engine braking apparatus according to claim 1 is characterized in that: the dislocation angle of described major and minor cam (21,22) makes motor when braking state, and exhaust valve (10) is opened exhaust latter stage in compression stroke.
3. engine braking apparatus according to claim 1 and 2 is characterized in that: exhaust valve (10) lift that exhaust valve (10) lift that described main cam (21) drives drives greater than auxiliary cam (22).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007101920203A CN101215980A (en) | 2007-12-28 | 2007-12-28 | Engine brake device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007101920203A CN101215980A (en) | 2007-12-28 | 2007-12-28 | Engine brake device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101215980A true CN101215980A (en) | 2008-07-09 |
Family
ID=39622483
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2007101920203A Pending CN101215980A (en) | 2007-12-28 | 2007-12-28 | Engine brake device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101215980A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102588030A (en) * | 2011-01-05 | 2012-07-18 | 上海尤顺汽车部件有限公司 | Auxiliary valve driving mechanism of engine |
| CN105041403A (en) * | 2015-08-11 | 2015-11-11 | 莫嘉林 | Speed retardance system for automobile engine |
| WO2018223798A1 (en) * | 2017-06-07 | 2018-12-13 | 大连理工大学 | Dual-camshaft switch fulcrum-type variable mode valve driving system |
-
2007
- 2007-12-28 CN CNA2007101920203A patent/CN101215980A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102588030A (en) * | 2011-01-05 | 2012-07-18 | 上海尤顺汽车部件有限公司 | Auxiliary valve driving mechanism of engine |
| CN102588030B (en) * | 2011-01-05 | 2016-08-10 | 上海尤顺汽车部件有限公司 | The auxiliary valve driving mechanism of electromotor |
| CN105041403A (en) * | 2015-08-11 | 2015-11-11 | 莫嘉林 | Speed retardance system for automobile engine |
| WO2018223798A1 (en) * | 2017-06-07 | 2018-12-13 | 大连理工大学 | Dual-camshaft switch fulcrum-type variable mode valve driving system |
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Open date: 20080709 |