CN103397923B - A kind of compression release engine braking apparatus - Google Patents
A kind of compression release engine braking apparatus Download PDFInfo
- Publication number
- CN103397923B CN103397923B CN201310355576.5A CN201310355576A CN103397923B CN 103397923 B CN103397923 B CN 103397923B CN 201310355576 A CN201310355576 A CN 201310355576A CN 103397923 B CN103397923 B CN 103397923B
- Authority
- CN
- China
- Prior art keywords
- rocker
- engine braking
- master
- pitman arm
- arm shaft
- 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
Abstract
The present invention proposes a kind of compression release engine braking apparatus, structure is reliable, and arrangement convenience in structure, does not increase motor height.Its technological points is: be arranged on pitman arm shaft; pitman arm shaft is fixed on fixed tray master rocker and secondary-rocker swing type; two perform piston assemblies and are evenly arranged on fixed tray; its piston rod directly connects with secondary-rocker; the endoporus interference fit joint of its cylinder body and fixed tray, master rocker front end resemble sufficient position, secondary-rocker front end resemble corresponding to the brake pushrod on the upper plane of air valve yoke, air valve yoke respectively enough; The end of master rocker is provided with camshaft, and the cam profile of camshaft is provided with two small boss; Profile of tooth connecting mode between master rocker and secondary-rocker controls by performing piston assembly, when engine braking does not work, and an only tooth contact between the two; During engine braking operation, multiple tooth contacts between the two.
Description
Technical field
The present invention relates to machinery and field of internal combustion engine, refer more particularly to the valve actuating mechanism in the air administrative field of internal-combustion engine, particularly a kind of compression release engine braking apparatus.
Background technique
Engine braking has two kinds of structural types to be compression-release and disappointing type respectively.Compression-release braking is that EXO lasts till the early stage of expansion stroke at four stroke engine compression stroke end of a period front opening exhaust valve.The break of compression-release is 3220392 in state in nineteen sixty-five at U.S. Patent number by U.S. Cummins.That patent describes the course of action of this braking system.System is hydraulic system, comprise main piston and sub-piston, the motion of main piston is driven by the exhaust cam of dedicated cam or adjacent cylinder, the hydraulic fluid that moves through of main piston is delivered to sub-piston, opens exhaust valve regularly to implement to reach braking effect to engine gas management by sub-piston.
Air-leakage type engine braking is except exhaust valve in four-stroke is normally opened, in partial periodicity, also keep a small amount of perseverance to open.Specifically in non-exhaust stroke, (aspirating stroke, compression stroke, expansion stroke) keeps a small amount of perseverance to open.This patent of invention describes in detail to some extent at the U.S. Patent number 6594996 of Jacobs company.
The main distinction of two kinds of structural types of engine braking has 2 points: one, the open phase of the outlet valve of braking is different.Be described for this above.Two, the opening travel braking outlet valve is different; For disappointing type in general roughly at 0.5-0.7mm; Compression-release in general at 1.5-2.0mm, for hydraulic type owing to there being compressibility, so theoretical stroke is more than 2.0.Incidentally once, disappointing braking must be combined with exhaust brake and just can reach certain effect; And compression-release can be used alone.
For the air-leakage type engine braking that present stage is all, all carry out driven plunger by hydraulic system and open outlet valve.The shortcoming of this structure is that hydraulic system bears larger oil pressure.
The structural principle of the present stage of compression-release has three kinds, and a kind of being moved down by hydraulic system driven plunger is contacted with outlet valve, and then drive exhauxt valve opens and closedown by cam, the pressure that system is born is born by hydraulic system.Representative U.S. Patent number 5146890.A kind of braking system reaches regular by the center height changing camshaft and opens exhaust valve.Representative patent proposes for Iveco/Nissan.Be in addition Shanghai especially along auto parts and components Co., Ltd, promote to move down to move with piston under rocking arm front end inside connecting rod to contact exhaust valve by hydraulic system, then drive exhaust valve by cam; A hydraulic system drive link, connecting rod bears pressure in the course of the work, and hydraulic system does not bear the pressure in work, and representative is publication number is the patent of CN202140127U.
Summary of the invention
The object of the invention is to be to provide a kind of compression release engine braking apparatus, the structure proposed to solve in braking operation process hydraulic system bear high reliability that braking oil pressure brings, system responses and hydraulic jack effect problem; Simultaneously structurally arrangement convenience, does not increase motor height.
One compression release engine braking apparatus of the present invention, comprise a master rocker, secondary-rocker, fixed tray, one have the pitman arm shaft of two oil ducts, two perform piston assemblies, a camshaft; pitman arm shaft is fixed on fixed tray; master rocker and secondary-rocker swing type ground are arranged on pitman arm shaft; an oil duct of pitman arm shaft lubricates pitman arm shaft; another oil duct of pitman arm shaft is by the power oil-duct of electromagnetic valve, is used for driving execution piston assembly; Two perform piston assembly and are evenly arranged on fixed tray, and there is screw thread the piston rod one end performing piston assembly, and it directly connects with secondary-rocker, performs the cylinder body of piston assembly and the endoporus interference fit joint of fixed tray;
The front end of master rocker is fixed with and resembles foot, and secondary-rocker front end is fixed with is resembled foot by adjustment bolt, Returnning spring, master rocker to resemble sufficient position corresponding to the upper plane of air valve yoke, secondary-rocker to resemble foot corresponding to the brake pushrod on air valve yoke; Camshaft is arranged on the end of master rocker, and the cam profile of camshaft is provided with two small boss;
A kind of profile of tooth connecting mode between master rocker and secondary-rocker, when engine braking does not work, an only tooth contact between the two, master rocker only passes to the anticlockwise rotation of secondary-rocker; During engine braking operation, multiple tooth contacts between the two, and major and minor rocking arm rotary motion is synchronous; Under braking operation state, tooth connects the accuracy and reliability that must be able to ensure to transmit motion, and two kinds of working staties that tooth connects drive secondary-rocker motion to realize by performing piston assembly.
Beneficial effect: the structure that the present invention proposes is reliable, to solve in braking operation process hydraulic system bear high reliability that braking oil pressure brings, system responses and hydraulic jack effect problem; Simultaneously structurally arrangement convenience, does not increase motor height.
Accompanying drawing explanation
Fig. 1 is engine braking off working state figure.
Fig. 2 is engine braking off working state stereogram.
Fig. 3 is engine braking operation phase diagram.
Fig. 4 is engine braking operation state stereogram.
Fig. 5 is the major and minor rocking arm unfolded drawing of engine braking operation state.
Fig. 6 is the major and minor rocking arm unfolded drawing of engine braking off working state.
Fig. 7 is that engine braking operation state performs piston action and oil circuit flow schematic diagram
Fig. 8 is that engine braking off working state performs piston action and oil circuit flow schematic diagram.
Shown in figure: 1, master rocker; 2, secondary-rocker; 3, fixed tray; 4, camshaft; 5, oil leab; 6, oil duct is performed; 7, brake pushrod; 8, Returnning spring; 9, air valve yoke; 10, pitman arm shaft; 11, piston assembly is performed; 12, return spring; 13 threaded multidiameter shafts; 14, the tooth of master rocker; 15, the tooth of secondary-rocker; 16, foot is resembled; 17, bolt is adjusted.
Embodiment
One compression release engine braking apparatus as shown in Fig. 1, Fig. 3, Fig. 7, Fig. 8, comprising a master rocker 1, secondary-rocker 2, fixed tray 3, has the pitman arm shaft 10, two of two oil ducts to perform piston assembly 11, camshaft 4; pitman arm shaft 10 is fixed on fixed tray 3; master rocker 1 and secondary-rocker 2 swing type ground are arranged on pitman arm shaft 10; oil duct (oil leab 5) of pitman arm shaft lubricates pitman arm shaft; another oil duct (performing oil duct 6) of pitman arm shaft is by the power oil-duct of electromagnetic valve, is used for driving execution piston assembly; Two perform piston assembly 11 and are evenly arranged on fixed tray, and there is screw thread the piston rod one end performing piston assembly 11, and it directly connects with secondary-rocker 2, performs the cylinder body of piston assembly and the endoporus interference fit joint of fixed tray 3;
The front end of master rocker 1 is fixed with and resembles foot, and secondary-rocker front end is fixed with by adjustment bolt 17, Returnning spring 8 and resembles foot 16, master rocker to resemble sufficient position corresponding to the upper plane of air valve yoke 9, resembling of secondary-rocker is 16 corresponding to the brake pushrod 7 on air valve yoke enough; Camshaft 4 is arranged on the end of master rocker, and the cam profile of camshaft is provided with two small boss;
It is a kind of profile of tooth connecting mode between master rocker 1 and secondary-rocker 2, when engine braking does not work, only a tooth contact is (as shown in Figure 6 between the two, label 14 is teeth of master rocker, label 15 is teeth of secondary-rocker ,=in a non-operative state, two teeth of major and minor Rocker arm assembly are in top root alignment place, Topland is inclined-plane, has a rational gap between major and minor Rocker arm assembly tooth top and tooth root simultaneously.), master rocker only passes to the anticlockwise rotation of secondary-rocker; During engine braking operation, multiple tooth carries out contacting (as shown in Figure 5) between the two, and major and minor rocking arm rotary motion is synchronous; Under braking operation state, tooth connects the accuracy and reliability that must be able to ensure to transmit motion, and two kinds of working staties that tooth connects drive secondary-rocker motion to realize by performing piston assembly.
During for exhaust rocker arm as master rocker, the cam profile of camshaft comprises cam profile when two small boss and exhaust valve normally work; During for master rocker for designing separately, need increase cam for engine braking, cam profile only only has two small boss.
State shown in Fig. 1,2 is engine braking off working state, cam and master rocker roller contact are at base circle position, now secondary-rocker is resembling under the effect of sufficient spring 8, resemble foot 16 to contact with brake pushrod 7 (now resemble foot 16 and have comparatively wide arc gap with adjustment bolt 17), simultaneously as shown in Figure 6 the contact condition of secondary-rocker and master rocker tooth also resemble enough 16 act under be in shown position, master rocker is under the effect of cam, rotate together with secondary-rocker, because the Rocker Ratio of master rocker is large, so the motion of opening valve is controlled by master rocker.
State shown in Fig. 3, Fig. 4 is engine braking operation state, now resembles foot 16 and contacts with push rod, resemble foot 16 very close to each other with adjustment bolt 17, and master rocker resembles foot and air valve yoke has gap simultaneously; On small boss, secondary-rocker 2 opens an exhaust valve by brake pushrod 7; And master rocker resemble the gap only overcome between itself and air valve yoke 9 of moving enough, so two of camshaft 4 small boss can control the unlatching of an exhaust valve well; Fig. 5 illustrates the contact condition of master rocker 1 and secondary-rocker 2 tooth under braking state, and now major-minor rocking arm becomes a part body.
As shown in Figure 7, Figure 8, execution piston assembly 11 comprises piston/cylinder, threaded multidiameter shaft 13, return spring 12 on fixed tray, and return spring 12 is returning devices of multidiameter shaft 13; Multidiameter shaft 13 performs the piston rod of piston assembly 11 and the single piece united two into one of piston.
Demonstrate the step that this motor institute operation technique drives exhauxt valve opens below:
1, solenoid valves, solenoid valve oil circuit is opened, now perform oil duct 6 and have 2-4bar oil, this oil circuit is entered by the oilhole of fixed tray 3 and performs piston assembly 11, under the effect of oil pressure, threaded multidiameter shaft 13 moves, because fixed tray 3 is being axially fixing, draw close so perform piston assembly promotion secondary-rocker to master rocker.Two bevelled teeth of band of major and minor rocking arm are under the effect of axial force, and relatively rotate (state being become Fig. 5 by the state of Fig. 6);
The axial displacement of the secondary-rocker 2, under execution piston action now just overcomes the axial clearance between major and minor rocking arm.Major and minor rocking arm is integral.Secondary-rocker is state relatively before this, rotates counterclockwise an angle; Just use to resemble under the state of basic circle and 16 contact with brake pushrod 7 (adjust bolt 17 simultaneously and resemble gapless between foot 16) enough; Under the driving of cam (cam only also master rocker have contact, also only act on master rocker 1.) under normal exhaust door is opened, the exhauxt valve opens that two other small boss controls, thus reach the requirement of the required exhaust valve movement rule of compression-release engine braking;
3, solenoid valve power-off, now performs oil duct 6 oil pressure and becomes 0bar, performs piston 11 return, i.e. threaded multidiameter shaft 13 return under the effect of execution piston spring, drives secondary-rocker to depart from master rocker simultaneously.Owing to moving axially limited displacement, the coupled situation between major and minor rocking arm becomes Fig. 6 by Fig. 5.Resemble sufficient spring 8 effect lower adjustment bolt 17 simultaneously and resemble between foot 16 and have gap, but resemble between foot 16 and brake pushrod and be also in contact condition.The tooth contact state of major and minor rocking arm is also resembling under foot effect, the contacts side surfaces transmission campaign of a flank of master rocker and a tooth of secondary-rocker.
Claims (2)
1. a compression release engine braking apparatus, it is characterized in that: comprise a master rocker, secondary-rocker, fixed tray, one have the pitman arm shaft of two oil ducts, two perform piston assemblies, a camshaft; pitman arm shaft is fixed on fixed tray; master rocker and secondary-rocker swing type ground are arranged on pitman arm shaft; an oil duct of pitman arm shaft lubricates pitman arm shaft; another oil duct of pitman arm shaft is by the power oil-duct of electromagnetic valve, is used for driving execution piston assembly; Two perform piston assembly and are evenly arranged on fixed tray, and there is screw thread the piston rod one end performing piston assembly, and it directly connects with secondary-rocker, performs the cylinder body of piston assembly and the endoporus interference fit joint of fixed tray;
The front end of master rocker is fixed with and resembles foot, and secondary-rocker front end is fixed with is resembled foot by adjustment bolt, Returnning spring, master rocker to resemble sufficient position corresponding to the upper plane of air valve yoke, secondary-rocker to resemble foot corresponding to the brake pushrod on air valve yoke; Camshaft is arranged on the end of master rocker, and the cam profile of camshaft is provided with two small boss;
A kind of profile of tooth connecting mode between master rocker and secondary-rocker, when engine braking does not work, an only tooth contact between the two, master rocker only passes to the anticlockwise rotation of secondary-rocker; During engine braking operation, multiple tooth contacts between the two, and major and minor rocking arm rotary motion is synchronous; Under braking operation state, profile of tooth connects the accuracy and reliability that must be able to ensure to transmit motion, and two kinds of working staties that profile of tooth connects drive secondary-rocker motion to realize by performing piston assembly.
2. a kind of compression release engine braking apparatus as claimed in claim 1, it is characterized in that: perform piston assembly (11) and comprise the piston/cylinder on fixed tray, threaded multidiameter shaft (13), return spring (12), return spring (12) is the returning device of multidiameter shaft (13).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310355576.5A CN103397923B (en) | 2013-08-15 | 2013-08-15 | A kind of compression release engine braking apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310355576.5A CN103397923B (en) | 2013-08-15 | 2013-08-15 | A kind of compression release engine braking apparatus |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103397923A CN103397923A (en) | 2013-11-20 |
| CN103397923B true CN103397923B (en) | 2016-03-02 |
Family
ID=49561614
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310355576.5A Active CN103397923B (en) | 2013-08-15 | 2013-08-15 | A kind of compression release engine braking apparatus |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103397923B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104727878B (en) * | 2013-12-23 | 2017-03-22 | 上海柴油机股份有限公司 | Method for adjusting auxiliary brake gas distribution phases of overhead camshaft engine |
| CN106762013B (en) * | 2016-12-30 | 2020-05-22 | 中国第一汽车股份有限公司 | Gear and rack type engine brake mechanism |
| CN107420147B (en) * | 2017-09-07 | 2023-04-18 | 吉林大学 | Variable stroke engine valve driving device |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| BRPI0922516B1 (en) * | 2009-01-05 | 2020-10-06 | Shanguai Universoon Autoparts Co.,Ltd | APPARATUS TO CHANGE AN INTERNAL COMBUSTION ENGINE FROM A NORMAL ENGINE OPERATION FOR AN ENGINE BRAKING OPERATION AND METHOD FOR CONVERTING AN INTERNAL COMBUSTION ENGINE FROM A NORMAL ENGINE OPERATION TO AN ENGINE BRAKING OPERATION |
| CN102414403B (en) * | 2009-04-27 | 2015-09-09 | 雅各布斯车辆系统公司 | Special rocker arm type engine brake |
| JP5143877B2 (en) * | 2010-09-21 | 2013-02-13 | 日立オートモティブシステムズ株式会社 | Control device for variable valve timing mechanism |
| CN202325735U (en) * | 2011-11-09 | 2012-07-11 | 中国第一汽车股份有限公司 | Independent cam type engine braking device |
| CN102937041A (en) * | 2012-11-23 | 2013-02-20 | 中国第一汽车股份有限公司 | Rocker arm body capable of realizing braking function of engine |
| CN203822404U (en) * | 2013-08-15 | 2014-09-10 | 湖北广奥减振器制造有限公司 | Compression-releasing type engine brake apparatus |
-
2013
- 2013-08-15 CN CN201310355576.5A patent/CN103397923B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN103397923A (en) | 2013-11-20 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP7061395B2 (en) | Multimode valve drive system | |
| JP6764497B2 (en) | Linkage between auxiliary motion source and main motion load path in internal combustion engine | |
| CN107829791B (en) | Combined engine braking and positive power engine lost motion valve actuation system | |
| JP6109345B2 (en) | Integrated master-slave piston for actuating engine valves | |
| JP2011127611A (en) | Valve bridge with integrated lost motion system | |
| CN103397923B (en) | A kind of compression release engine braking apparatus | |
| CN112177703B (en) | Self-resetting single-valve main and auxiliary piston hydraulic driving device and method for push rod engine | |
| CN104454178A (en) | Engine braking method | |
| CN102635418A (en) | Method and device for resetting valve lift for engine brake | |
| CN203271844U (en) | Engine valve control camshaft following combined mechanism | |
| CN201461013U (en) | Internal-combustion engine rocker assembly | |
| CN202090975U (en) | Engine brake device positioned by valve rod of air valve | |
| CN204476493U (en) | Duplicated crank engine braking apparatus | |
| CN203822404U (en) | Compression-releasing type engine brake apparatus | |
| CN104314633B (en) | Variable valve driving mechanism of engine | |
| CN107842408B (en) | Variable valve lift mechanism, method for controlling valve lift and engine | |
| CN102733884A (en) | Integrated engine-braking device | |
| CN102691542B (en) | A kind of engine braking apparatus of being located by valve stem | |
| CN202194697U (en) | Integrated engine braking device | |
| CN104712397B (en) | Composite rocker arm engine braking device | |
| CN102477880B (en) | Braking device of toothed solid chain type engine | |
| CN201953428U (en) | Tooth-form fixed chain type engine braking gear | |
| CN204140153U (en) | The variable valve actuation of motor | |
| CN203962063U (en) | A kind of valve actuating mechanism | |
| CN204755006U (en) | Engine valve timing mechanism |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of invention: A compression release engine braking device Effective date of registration: 20220907 Granted publication date: 20160302 Pledgee: Bank of China Limited by Share Ltd. Shiyan branch Pledgor: Hubei Austrian-absorber Manufacturing Co.,Ltd. Registration number: Y2022980014765 |
|
| PE01 | Entry into force of the registration of the contract for pledge of patent right |