CN104727878B - Method for adjusting auxiliary brake gas distribution phases of overhead camshaft engine - Google Patents
Method for adjusting auxiliary brake gas distribution phases of overhead camshaft engine Download PDFInfo
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- CN104727878B CN104727878B CN201310715133.2A CN201310715133A CN104727878B CN 104727878 B CN104727878 B CN 104727878B CN 201310715133 A CN201310715133 A CN 201310715133A CN 104727878 B CN104727878 B CN 104727878B
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Abstract
The invention discloses a method for adjusting auxiliary brake gas distribution phases of an overhead camshaft engine. The method includes arranging scribed lines (13) corresponding to various cylinders on steps of a camshaft gear hub (18); forming a groove (14) in the middle of a top plane of a camshaft support (7); shifting flywheel tooth rings at a power output end of the engine when brake clearance (15) is about to be adjusted; adjusting an adjusting screw and nut combination (2) on a brake rocker arm (1) when the certain scribed line (13) on the camshaft gear hub (18) rotates into the range of the groove (14) so as to adjust the brake clearance (15) of the certain cylinder; sequentially adjusting the brake clearance (15) between various brake rocker arms (1) and exhaust valve bridges (16) of the other cylinders. A number of the certain cylinder is marked on the certain scribed line (13). The method has the advantages that the method is quite convenient to implement, and the work efficiency and the precision can be improved when the auxiliary brake gas distribution phases are adjusted on engine assembling lines.
Description
Technical field
The present invention relates to vehicle motor valve actuating mechanism.
Background technology
At present, heavy-duty truck and motorbus engine overhead camshaft valve actuating mechanism, generally using a kind of pressure
Contracting release type retarder complemental brake system, the device are a set of per cylinder, and wherein brake cam is set up on engine cam, system
Motion rocker arm is set up on motor rockshaft, and brake rocker arm afterbody roller is contacted with brake cam, and brake rocker arm head is in valve
The top of bridge one end simultaneously keeps certain gap, and air valve bridge is placed in valve top.Engine needs braking and vehicle to need to slow down
When, machine oil is uniformly controlled by magnetic valve and is entered in all brake rocker arms by rocker arm shaft, push the valve piston in brake rocker arm open,
Make to keep contacting between brake rocker arm and exhaust valve bridge, the brake rocker arm for now swinging with the rotation of brake cam is being sent out
Motivation compression stroke top dead center and suction stroke are ended the stage, and exhaust valve is moderately pushed open, so as to release cylinder internal power, car is reached
Slow down purpose.In order to ensure normal vehicle operation, when engine is normal mode of operation, in the complemental brake system
Brake rocker arm still can be swung with the rotation of camshaft, but brake rocker arm must remain disengagement with air valve bridge, therefore accurate
Really the gap between the brake rocker arm and exhaust valve bridge of adjustment engine complemental brake system, i.e. brake clearance, particularly significant.
The content of the invention
It is an object of the invention to provide a kind of method of adjustment overhead cam shaft generator auxiliary braking port timing, adopts
The method that can quick, accurately adjust each cylinder brake rocker arm and air valve bridge gap with the method.
The present invention is achieved in that a kind of method of adjustment overhead cam shaft generator auxiliary braking port timing,
There is groove corresponding with each cylinder on the step of cam shaft gear wheel hub, per pass groove is according to the adjustable moment per cylinder brake clearance
Corresponding corner between alignment pin determined, is all carved with the numeral for representing respective cylinder, camshaft support beside per pass groove
A groove is provided with the middle of the plane of top, side of the slot opening towards cam shaft gear, the rotation of the median plane of groove by gear
Center, the cam axle angle of the width of groove according to corresponding to the brake clearance between the cylinder brake rocker arm and exhaust valve bridge
Scope determines that, during adjustment brake clearance, first disk moves the flywheel ring gear of engine power output end, when the platform of cam shaft gear wheel hub
When the groove for indicating certain cylinder numeral on rank is turned in the range of groove, then it represents that now the cylinder is rolled in the afterbody of exhaust rocker arm
Wheel is on the basic circle of exhaust cam, while the afterbody roller of brake rocker arm is on brake cam basic circle, now by adjusting
Adjusting screw nut on the brake rocker arm, you can adjust the brake clearance of the cylinder, be sequentially adjusted in other each cylinder brake rocker arms and
Brake clearance between exhaust valve bridge, completes the adjustment of overhead cam shaft generator complemental brake system port timing.
The present invention by digital groove corresponding with each cylinder on cam shaft gear wheel hub and camshaft support top plane in the middle of
Groove, the method for adjusting the gap between the brake rocker arm and exhaust valve bridge of each cylinder complemental brake system of engine, very
It is convenient, substantially increase the operating efficiency and precision of engine assembly production line adjustment port timing.
Description of the drawings
Fig. 1 is the schematic perspective view of six cylinder engine valve actuating mechanism according to the present invention；
Fig. 2 is the three-dimensional signal of cam shaft gear wheel hub groove according to the present invention and camshaft support groove correspondence position
Figure；
Fig. 3 is the schematic perspective view of brake clearance adjustment position according to the present invention；
Fig. 4 is camshaft according to the present invention and rocker arm shaft installation site floor map；
Top views of the Fig. 5 for Fig. 4；
Fig. 6 is the graph of a relation of brake cam, exhaust cam and roller when adjusting brake clearance.
In figure, 1 is brake rocker arm, and 2 is adjusting screw nut, and 3 is exhaust rocker arm, and 4 is intake rocker, and 5 is rocker arm shaft, 6
For cam shaft gear, 7 is camshaft support, and 8 is admission cam, and 9 is exhaust cam, and 10 is brake cam, and 11 is camshaft, 12
For alignment pin, 13 is groove, and 14 is groove, and 15 is brake clearance, and 16 is exhaust valve bridge, and 17 is the air inlet raft of pontoons, and 18 is camshaft
Gear hub, 19 is afterbody roller.
Specific embodiment
1,2,3,4,5,6 the invention will be further described below in conjunction with the accompanying drawings.
A kind of method of adjustment overhead cam shaft generator auxiliary braking port timing, six cylinder Four valve overhead cams
Shaft generator, camshaft 11 are provided with admission cam 8, exhaust cam 9 and brake cam 10, and brake cam 10 is set up in engine
On camshaft 11, intake rocker 4 is installed on rocker arm shaft 5, exhaust is shaken, 3 and brake rocker arm 1, the platform of cam shaft gear wheel hub 18
There is groove 13 corresponding with each cylinder on rank, per pass groove 13 is all according to per corresponding between cylinder brake clearance 15 and alignment pin 12
Corner is determined, so being all carved with the numeral for representing respective cylinder, the groove 13 corresponding with the 6th cylinder beside per pass groove 13
Side just indicates the numeral 6 for representing the cylinder, and the groove 14 for having one fixed width is opened in the crown center of camshaft support 7, opening
Towards cam shaft gear 6, the pivot of the median plane of groove 14 by gear, the width of groove 14 is according to the cylinder brake rocker arm
The point of theory scope that camshaft 11 corresponding to clearance-adjustable between 1 and exhaust valve bridge 17 is rotated determines.Camshaft tooth
When the groove 13 for indicating certain cylinder numeral on the step of wheel wheel hub 18 is turned in the range of groove 14, then it represents that now the cylinder exists
The afterbody roller 19 of exhaust rocker arm 3 is on the basic circle of exhaust cam 9, while the afterbody roller 19 of brake rocker arm 1 is in braking
On 10 basic circle of cam, now by adjusting the adjusting screw nut 2 on the brake rocker arm 1, so that it may adjust the brake clearance of the cylinder
15, the brake clearance 15 being sequentially adjusted between other each cylinder brake rocker arms 1 and exhaust valve bridge 16 completes overhead camshaft and starts
The adjustment of machine complemental brake system port timing.
When adjusting brake clearance 15, first according to normal engine assembly order, intake rocker 4 and the air inlet raft of pontoons 17,
Valve clearance between exhaust rocker arm 3 and exhaust valve bridge 16 is adjusted, then the flywheel ring gear of the dynamic engine power output end of disk,
At this moment need to only observe in the top of camshaft support 7, when the groove 13 that cam shaft gear 6 is marked with numeral 6 turns to recessed
When in the range of groove 14, then it represents that be now exhaust rocker arm 3 afterbody roller 19 in exhaust cam 9 basic circle on, while
The afterbody roller 19 of brake rocker arm 1 can now be adjusted the brake clearance 15 of the 6th cylinder on the basic circle of brake cam 10,
Between the brake rocker arm 1 and exhaust valve bridge 16 at the adjustment position, the iron plate of one piece of 4mm thickness is filled in, adjust adjusting screw spiral shell
After female 2 make iron plate movement between brake rocker arm 1 and exhaust valve bridge 16 have significantly retardance sense, adjusting screw nut 2 is tightened, is taken out
Go out iron plate and be the 6th cylinder brake clearance 15 for completing to adjust, continue the dynamic engine of disk, repeat the above steps, you can quick, side
Just it is sequentially adjusted in the brake clearance 15 of each cylinder of engine.
The method of present invention adjustment overhead cam shaft generator complemental brake system port timing, it is easy to operate,
And heavy vehicle motor can be accurately judged using 1 phase place of brake rocker arm of compression-release retarder, so as to quick
The adjustment of each cylinder brake clearance of engine 15 is completed, operating efficiency is improved, it is ensured that compression-release retarder reliably working.
Claims (1)
1. it is a kind of adjustment overhead cam shaft generator auxiliary braking port timing method, it is characterised in that cam shaft gear wheel
Hub（18）Step on have groove corresponding with each cylinder（13）, per pass groove (13) is according to adjustable per cylinder brake clearance (15)
Corresponding corner between moment and alignment pin (12) is determined that per pass groove is all carved with the number for representing respective cylinder beside (13)
Word, camshaft support (7) are pushed up and are provided with a groove (14) in the middle of plane, side of groove (14) opening towards cam shaft gear (6),
Pivot of the median plane of groove (14) by cam shaft gear (6), the width of groove (14) is according to the cylinder brake rocker arm (1)
With the brake clearance between exhaust valve bridge (16)（15）Corresponding camshaft (11) rotational angle range determination, adjusts brake cabin
During gap (15), first disk moves the flywheel ring gear of engine power output end, when indicating on the step of cam shaft gear wheel hub (18)
When the groove (13) of certain cylinder numeral is turned in the range of groove (14), then it represents that now afterbody of the cylinder in exhaust rocker arm (3)
Roller (19) is on exhaust cam (9) basic circle, while the afterbody roller (19) of brake rocker arm (1) is in brake cam (10) base
On circle, now by adjusting the adjusting screw nut (2) on the brake rocker arm (1), you can adjust the brake clearance (15) of the cylinder,
The brake clearance (15) being sequentially adjusted between other each cylinder brake rocker arm (1) and exhaust valve bridge (16), completes overhead camshaft
The adjustment of engine complemental brake system port timing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310715133.2A CN104727878B (en) | 2013-12-23 | 2013-12-23 | Method for adjusting auxiliary brake gas distribution phases of overhead camshaft engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310715133.2A CN104727878B (en) | 2013-12-23 | 2013-12-23 | Method for adjusting auxiliary brake gas distribution phases of overhead camshaft engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104727878A CN104727878A (en) | 2015-06-24 |
| CN104727878B true CN104727878B (en) | 2017-03-22 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310715133.2A Active CN104727878B (en) | 2013-12-23 | 2013-12-23 | Method for adjusting auxiliary brake gas distribution phases of overhead camshaft engine |
Country Status (1)
| Country | Link |
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| CN (1) | CN104727878B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112963220B (en) * | 2021-02-08 | 2022-08-02 | 广西玉柴机器股份有限公司 | Brake valve of integrated rocker arm brake mechanism and method for adjusting brake clearance |
| CN113356955A (en) * | 2021-06-18 | 2021-09-07 | 广西玉柴机器股份有限公司 | Method for adjusting brake clearance of special brake rocker arm |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201125758Y (en) * | 2007-12-18 | 2008-10-01 | 广西玉柴机器股份有限公司 | Cam axle structure with cylinder internal exhaust brake |
| CN103075222A (en) * | 2012-12-30 | 2013-05-01 | 洛阳北方企业集团有限公司 | Valve timing adjusting device for engine and use method thereof |
| CN103397923A (en) * | 2013-08-15 | 2013-11-20 | 湖北广奥减振器制造有限公司 | Device for compressing and releasing engine braking |
-
2013
- 2013-12-23 CN CN201310715133.2A patent/CN104727878B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201125758Y (en) * | 2007-12-18 | 2008-10-01 | 广西玉柴机器股份有限公司 | Cam axle structure with cylinder internal exhaust brake |
| CN103075222A (en) * | 2012-12-30 | 2013-05-01 | 洛阳北方企业集团有限公司 | Valve timing adjusting device for engine and use method thereof |
| CN103397923A (en) * | 2013-08-15 | 2013-11-20 | 湖北广奥减振器制造有限公司 | Device for compressing and releasing engine braking |
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| CN104727878A (en) | 2015-06-24 |
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Address after: 2636 Jungong Road, Yangpu District, Shanghai 200438 Patentee after: Shanghai New Power Automotive Technology Co.,Ltd. Address before: 2636 Jungong Road, Yangpu District, Shanghai 200438 Patentee before: SHANGHAI DIESEL ENGINE Co.,Ltd. |