CN113356955A - Method for adjusting brake clearance of special brake rocker arm - Google Patents
Method for adjusting brake clearance of special brake rocker arm Download PDFInfo
- Publication number
- CN113356955A CN113356955A CN202110682606.8A CN202110682606A CN113356955A CN 113356955 A CN113356955 A CN 113356955A CN 202110682606 A CN202110682606 A CN 202110682606A CN 113356955 A CN113356955 A CN 113356955A
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- brake
- rocker arm
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- clearance
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- 238000000034 method Methods 0.000 title claims abstract description 32
- 230000006835 compression Effects 0.000 claims abstract description 17
- 238000007906 compression Methods 0.000 claims abstract description 17
- 241001584775 Tunga penetrans Species 0.000 claims 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000007717 exclusion Effects 0.000 description 1
- 238000010304 firing Methods 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
- F01L1/20—Adjusting or compensating clearance
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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
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Valve-Gear Or Valve Arrangements (AREA)
Abstract
The invention discloses a brake clearance adjusting method of a special brake rocker arm, which is suitable for a compression release type auxiliary braking engine, wherein the engine comprises an inlet valve rocker arm, an exhaust valve rocker arm and a brake rocker arm which are pivoted on a rocker arm shaft, and the brake clearance adjusting method comprises the following steps: a dial is hung at the front end of the engine; the intake valve clearance and the exhaust valve clearance complete two turns according to a normal ignition state and turning; the barring finds the compression top dead center of the first cylinder to the last, and the pointer of the dial is aligned to the zero-degree scale mark at the moment; and continuing turning the engine to enable the front end of the engine to rotate the crankshaft angle of N degrees clockwise, enabling the pointer of the dial to align with the scale marks of the first cylinder and the last but one cylinder, and adjusting the braking gap of the first cylinder. The braking clearance adjusting method can enable the braking power of the compression release type auxiliary braking engine to meet the requirements of regulations.
Description
Technical Field
The invention relates to a method for adjusting the brake clearance of a special brake rocker arm suitable for a compression release type auxiliary brake engine.
Background
According to national regulations GB 7258-2017: the passenger car with the car length larger than 9m (the length of the special school bus is larger than 8m), the freight car and the special operation car with the total weight larger than or equal to 12000kg, and the dangerous goods transport car with the total weight larger than 3500kg are provided with a retarder or other auxiliary braking devices.
In the current industry, an in-cylinder braking technical route of air release type braking does not need to change a valve mechanism and a special braking camshaft, namely an air inlet rocker arm, an air outlet rocker arm and the camshaft do not need to be changed, so that the valve clearance adjusting process of the existing air inlet rocker arm and air outlet rocker arm is adjusted according to the process without engine auxiliary braking, but the air release type braking has low braking power and can not meet the braking power required by regulations.
The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art.
Disclosure of Invention
The invention aims to provide a brake clearance adjusting method of a special brake rocker arm, which can enable the brake power of a compression release type auxiliary brake engine to meet the requirements of the existing regulations.
In order to achieve the purpose, the invention provides a brake clearance adjusting method of a special brake rocker arm, which is suitable for a compression release type auxiliary braking engine, wherein the engine comprises an inlet valve rocker arm, an exhaust valve rocker arm and a brake rocker arm which are pivoted on a rocker arm shaft, and the brake clearance adjusting method comprises the following steps: a dial is hung at the front end of the engine; the intake valve clearance and the exhaust valve clearance complete two turns according to a normal ignition state and turning; the barring finds the compression top dead center of the first cylinder to the last, and the pointer of the dial is aligned to the zero-degree scale mark at the moment; and continuing turning the engine to enable the front end of the engine to rotate the crankshaft angle of N degrees clockwise, enabling the pointer of the dial to align with the scale marks of the first cylinder and the last but one cylinder, and adjusting the braking gap of the first cylinder.
In a preferred embodiment, the brake clearance adjustment method of the dedicated brake rocker arm further includes: and continuing turning the engine to enable the front end of the engine to rotate clockwise by a crank angle of 120 degrees again so that the pointer of the dial is aligned with the scale marks of the second cylinder and the penultimate cylinder, and adjusting the brake clearance of the penultimate cylinder.
In a preferred embodiment, the brake clearance adjustment method of the dedicated brake rocker arm further includes: and continuing turning the engine to rotate the front end of the engine by 120 degrees clockwise so that the pointer of the dial is aligned with the scale marks of the third cylinder and the third last cylinder, and adjusting the brake clearance of the third cylinder.
In a preferred embodiment, the brake clearance adjustment method of the dedicated brake rocker arm further includes: clockwise turning to find the compression top dead center of the first cylinder, and aligning the pointer of the dial with the zero-degree scale mark; and continuing turning the engine to enable the front end of the engine to rotate clockwise by a crank angle of N degrees so that the pointer of the dial is aligned with the scale marks of the first cylinder and the last cylinder, and adjusting the brake clearance of the first cylinder to the last.
In a preferred embodiment, the brake clearance adjustment method of the dedicated brake rocker arm further includes: and continuing turning the engine to enable the front end of the engine to rotate clockwise by a crank angle of 120 degrees again so that the pointer of the dial is aligned with the scale marks of the second cylinder and the last but one cylinder, and adjusting the braking gap of the second cylinder.
In a preferred embodiment, the brake clearance adjustment method of the dedicated brake rocker arm further includes: and continuing turning the engine to rotate the front end of the engine by 120 degrees of crankshaft angle clockwise so that the pointer of the dial is aligned with the scale marks of the third cylinder and the third last cylinder, and adjusting the brake clearance of the third last cylinder.
In a preferred embodiment, the exhaust valve is required to be fully seated before the dial attachment step at the front end of the engine.
In a preferred embodiment, the adjustment range of the brake clearance is the base circle of the normal-ignition exhaust cam and the base circle of the brake cam.
Compared with the prior art, the method for adjusting the brake clearance of the special brake rocker arm has the following beneficial effects: the brake power of the compression release type auxiliary brake engine can meet the requirements of the existing regulations, and the brake efficiency is high and the safety is high.
Drawings
FIG. 1 is a schematic structural view of a brake rocker arm assembly according to an embodiment of the present invention;
FIG. 2 is a schematic structural view of an intake valve rocker arm, an exhaust valve rocker arm, and a brake rocker arm according to an embodiment of the present invention;
FIG. 3 is a schematic illustration of lift curves for exhaust and brake valves according to an embodiment of the present invention;
FIG. 4 is an angular schematic of a dial according to an embodiment of the present invention.
Description of the main reference numerals:
1-brake rocker arm, 2-control valve, 3-drive piston, 4-valve cap, 5-valve bridge component, 6-brake exhaust valve, 7-roller, 8-brake cam, 81-BGR brake bulge, 82-CR brake bulge, 9-intake valve rocker arm and 10-exhaust valve rocker arm.
Detailed Description
The following detailed description of the present invention is provided in conjunction with the accompanying drawings, but it should be understood that the scope of the present invention is not limited to the specific embodiments.
Throughout the specification and claims, unless explicitly stated otherwise, the word "comprise", or variations such as "comprises" or "comprising", will be understood to imply the inclusion of a stated element or component but not the exclusion of any other element or component.
As shown in fig. 1, the brake clearance adjusting method for the special brake rocker arm is suitable for an engine with compression release auxiliary braking, and the engine comprises an inlet valve rocker arm, an exhaust valve rocker arm and a brake rocker arm which are pivoted on a rocker arm shaft. Taking the brake rocker arm component as an example, the brake rocker arm component mainly comprises a brake rocker arm 1, a control valve 2, a driving piston 3, a valve cap 4, a valve bridge assembly 5, a brake exhaust valve 6, a roller 7, a brake cam 8 (comprising a BGR brake bulge 81 and a CR brake bulge 82), an intake valve rocker arm 9, an exhaust valve rocker arm 10 and the like.
As shown in fig. 1, in some embodiments, a brake clearance adjustment method for a dedicated brake rocker arm of a preferred embodiment of the present invention is compression-release only for engine assisted braking: the special rocker arm braking scheme is characterized in that the engine is provided with an inlet valve rocker arm, an exhaust valve rocker arm and a braking rocker arm (the special rocker arm has a braking function).
As shown in fig. 3, in some embodiments, the brake lash adjustment angle for the dedicated rocker arm braking scheme requires 2 exhaust valves to be fully seated (2 exhaust valves for example), and the brake lash adjustment range is the base circle of the normal firing exhaust cam and the base circle of the brake cam.
As shown in fig. 4, in some embodiments, a dial is hung on the front or rear end of the engine or a brake clearance adjustment process scale line is added on the disc-shaped part.
In some embodiments, a brake clearance adjustment method for a dedicated brake rocker arm according to a preferred embodiment of the present invention includes: intake valve clearance, exhaust valve clearance, and brake clearance adjustment sequence (taking a six-cylinder engine as an example): the intake valve clearance and the exhaust valve clearance are completed by turning 2 circles in a normal ignition state (non-cylinder braking).
1. The barring finds the top dead center of the 6 th cylinder compression, the pointer is aligned to the scale mark 0 at this time, then the barring is continued to enable the pointer to align to the scale mark 1/6 of the cylinder by rotating the crankshaft angle of N degrees clockwise at the front end (or rotating the crankshaft angle of N degrees anticlockwise at the rear end), and the braking gap of the 1 st cylinder is adjusted, specifically: and a special brake clearance feeler gauge is used for placing a brake clearance adjusting position, and the brake clearance is adjusted according to the process requirement. Please refer to fig. 4.
2. And the pointer rotates 120 degrees clockwise, and is aligned with 2/5 scale marks to adjust the braking clearance of the 5 th cylinder.
3. And the pointer rotates 120 degrees clockwise, and is aligned with 3/4 scale marks, so that the braking clearance of the 3 rd cylinder is adjusted.
4. When the cylinder rotates clockwise to 1 compression top dead center, the pointer is aligned with the scale mark 0, and then the barring is continued to enable the front end to rotate clockwise by a crank angle of N degrees (the rotating speed signal disc at the front end rotates the pointer clockwise to be aligned with the scale mark 1/6, and the 6 th cylinder brake clearance is adjusted.
5. Rotating the pointer 120 degrees clockwise aligns with 2/5 scale marks to adjust the brake clearance of the 2 nd cylinder.
6. Rotating the pointer 120 degrees clockwise aligns with 3/4 scale marks to adjust the brake clearance of the 4 th cylinder.
In summary, the method for adjusting the brake clearance of the special brake rocker arm has the following beneficial effects: the brake power of the compression release type auxiliary brake engine can meet the requirements of the existing regulations, and the brake efficiency is high and the safety is high.
The foregoing descriptions of specific exemplary embodiments of the present invention have been presented for purposes of illustration and description. It is not intended to limit the invention to the precise form disclosed, and obviously many modifications and variations are possible in light of the above teaching. The exemplary embodiments were chosen and described in order to explain certain principles of the invention and its practical application to enable one skilled in the art to make and use various exemplary embodiments of the invention and various alternatives and modifications as are suited to the particular use contemplated. It is intended that the scope of the invention be defined by the claims and their equivalents.
Claims (8)
1. A method for adjusting the braking clearance of a special braking rocker arm is suitable for a compression release type engine with auxiliary braking, the engine comprises an inlet valve rocker arm, an exhaust valve rocker arm and a braking rocker arm which are pivoted on a rocker arm shaft, and the method is characterized by comprising the following steps:
hanging a dial on the front end of the engine;
the intake valve clearance and the exhaust valve clearance complete two turns according to a normal ignition state and turning;
the barring finds a compression top dead center of a cylinder with the last but one, and at the moment, a pointer of the dial is aligned to a zero-degree scale mark; and
and continuing turning the front end of the engine by N crankshaft angles clockwise by turning the front end of the engine, aligning the pointer of the dial with the scale marks of the first and last cylinders, and adjusting the braking clearance of the first cylinder.
2. The method for adjusting the brake clearance of a dedicated brake rocker arm according to claim 1, further comprising: and continuing turning the front end of the engine by the jigger to rotate the crankshaft angle of 120 degrees clockwise again so that the pointer of the dial is aligned with the scale marks of the second and last but one cylinder, and adjusting the brake clearance of the last but one cylinder.
3. The method for adjusting the brake clearance of a dedicated brake rocker arm according to claim 2, further comprising: and continuing turning the front end of the engine by 120 DEG crankshaft angle clockwise by continuing turning the dial to align the pointer of the dial with the scale marks of the third cylinder and the third last cylinder, and adjusting the brake clearance of the third cylinder.
4. The method for adjusting the brake clearance of a dedicated brake rocker arm according to claim 1, further comprising:
clockwise turning to find a compression top dead center of the first cylinder, and enabling a pointer of the dial to be aligned to a zero-degree scale mark; and
and continuing turning the front end of the engine by N crankshaft angles clockwise by turning the front end of the engine, aligning the pointer of the dial with the scale marks of the first cylinder and the last cylinder, and adjusting the brake clearance of the last cylinder.
5. The method for adjusting the brake clearance of a dedicated brake rocker arm according to claim 4, further comprising: and continuing turning the engine to enable the front end of the engine to rotate clockwise by a crank angle of 120 degrees again so that the pointer of the dial is aligned with the scale marks of the second and last-but-one cylinders to adjust the braking clearance of the second cylinder.
6. The method for adjusting the brake clearance of a dedicated brake rocker arm of claim 5, further comprising: and continuing turning the front end of the engine by rotating the crankshaft angle of 120 degrees clockwise by the jigger to enable the pointer of the dial to be aligned with the scale marks of the third cylinder and the third last cylinder, and adjusting the brake clearance of the third last cylinder.
7. The method of adjusting the detent lash of a dedicated brake rocker arm of claim 1, wherein the exhaust valve is required to be fully seated prior to said step of attaching a dial to the front end of said engine.
8. The brake clearance adjustment method for a dedicated brake rocker arm according to claim 1, wherein the adjustment range of the brake clearance is a base circle of a normal ignition exhaust cam and a base circle of a brake cam.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110682606.8A CN113356955A (en) | 2021-06-18 | 2021-06-18 | Method for adjusting brake clearance of special brake rocker arm |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110682606.8A CN113356955A (en) | 2021-06-18 | 2021-06-18 | Method for adjusting brake clearance of special brake rocker arm |
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| Publication Number | Publication Date |
|---|---|
| CN113356955A true CN113356955A (en) | 2021-09-07 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110682606.8A Pending CN113356955A (en) | 2021-06-18 | 2021-06-18 | Method for adjusting brake clearance of special brake rocker arm |
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Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2003004594A (en) * | 2001-06-20 | 2003-01-08 | Nittan Valve Co Ltd | System for analyzing variable valve timing control unit |
| US20110114060A1 (en) * | 2009-11-19 | 2011-05-19 | Hyundai Motor Company | Engine brake and engine provided with the same |
| CN103703220A (en) * | 2012-03-16 | 2014-04-02 | 日锻汽门株式会社 | Mechanical lash adjuster |
| CN203891957U (en) * | 2013-12-27 | 2014-10-22 | 中国第一汽车股份有限公司 | Independent cam engine brake device |
| WO2015017057A1 (en) * | 2013-07-29 | 2015-02-05 | Cummins Inc. | Engine brake lash adjuster device and method |
| CN104727878A (en) * | 2013-12-23 | 2015-06-24 | 上海柴油机股份有限公司 | Method for adjusting auxiliary brake gas distribution phases of overhead camshaft engine |
| CN204921791U (en) * | 2015-09-06 | 2015-12-30 | 韩克允 | Two -way regulation car of intelligence braking clearance adjustment arm |
| CN107191512A (en) * | 2017-07-06 | 2017-09-22 | 浙江春风动力股份有限公司 | A kind of motor vehicle and its self compensation brake gear |
| CN109404157A (en) * | 2018-11-20 | 2019-03-01 | 中国石油天然气集团有限公司 | A kind of engine flywheel housing observation window and jiggering method |
| CN209179837U (en) * | 2018-12-03 | 2019-07-30 | 潍柴动力股份有限公司 | A kind of valve clearance adjustment mechanism and engine |
| CN110925044A (en) * | 2019-11-28 | 2020-03-27 | 广西玉柴机器股份有限公司 | Method for braking in engine cylinder and adjusting valve clearance and angle measuring tool |
| CN112282888A (en) * | 2020-11-23 | 2021-01-29 | 浙江黎明智造股份有限公司 | Engine braking device with continuously adjustable braking lift |
| CN112963220A (en) * | 2021-02-08 | 2021-06-15 | 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 |
-
2021
- 2021-06-18 CN CN202110682606.8A patent/CN113356955A/en active Pending
Patent Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003004594A (en) * | 2001-06-20 | 2003-01-08 | Nittan Valve Co Ltd | System for analyzing variable valve timing control unit |
| US20110114060A1 (en) * | 2009-11-19 | 2011-05-19 | Hyundai Motor Company | Engine brake and engine provided with the same |
| CN103703220A (en) * | 2012-03-16 | 2014-04-02 | 日锻汽门株式会社 | Mechanical lash adjuster |
| WO2015017057A1 (en) * | 2013-07-29 | 2015-02-05 | Cummins Inc. | Engine brake lash adjuster device and method |
| CN104727878A (en) * | 2013-12-23 | 2015-06-24 | 上海柴油机股份有限公司 | Method for adjusting auxiliary brake gas distribution phases of overhead camshaft engine |
| CN203891957U (en) * | 2013-12-27 | 2014-10-22 | 中国第一汽车股份有限公司 | Independent cam engine brake device |
| CN204921791U (en) * | 2015-09-06 | 2015-12-30 | 韩克允 | Two -way regulation car of intelligence braking clearance adjustment arm |
| CN107191512A (en) * | 2017-07-06 | 2017-09-22 | 浙江春风动力股份有限公司 | A kind of motor vehicle and its self compensation brake gear |
| CN109404157A (en) * | 2018-11-20 | 2019-03-01 | 中国石油天然气集团有限公司 | A kind of engine flywheel housing observation window and jiggering method |
| CN209179837U (en) * | 2018-12-03 | 2019-07-30 | 潍柴动力股份有限公司 | A kind of valve clearance adjustment mechanism and engine |
| CN110925044A (en) * | 2019-11-28 | 2020-03-27 | 广西玉柴机器股份有限公司 | Method for braking in engine cylinder and adjusting valve clearance and angle measuring tool |
| CN112282888A (en) * | 2020-11-23 | 2021-01-29 | 浙江黎明智造股份有限公司 | Engine braking device with continuously adjustable braking lift |
| CN112963220A (en) * | 2021-02-08 | 2021-06-15 | 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 |
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Application publication date: 20210907 |
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