CN109958492B - Adjustable engine brake actuating mechanism and application method thereof - Google Patents
Adjustable engine brake actuating mechanism and application method thereof Download PDFInfo
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- CN109958492B CN109958492B CN201910222832.0A CN201910222832A CN109958492B CN 109958492 B CN109958492 B CN 109958492B CN 201910222832 A CN201910222832 A CN 201910222832A CN 109958492 B CN109958492 B CN 109958492B
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- 230000007246 mechanism Effects 0.000 title claims abstract description 33
- 238000000034 method Methods 0.000 title claims description 24
- 239000003921 oil Substances 0.000 claims description 195
- 239000010687 lubricating oil Substances 0.000 claims description 8
- 230000005540 biological transmission Effects 0.000 claims description 4
- 239000010705 motor oil Substances 0.000 description 5
- 230000006835 compression Effects 0.000 description 4
- 238000007906 compression Methods 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
Classifications
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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
- F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
- F01L1/20—Adjusting or compensating clearance
- F01L1/22—Adjusting or compensating clearance automatically, e.g. mechanically
- F01L1/24—Adjusting or compensating clearance automatically, e.g. mechanically by fluid means, e.g. hydraulically
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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
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- 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
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Valve Device For Special Equipments (AREA)
Abstract
The utility model provides an engine braking actuating mechanism with adjustable, includes rocking arm and braking oil circuit, the braking oil pocket that sets up in it, set up brake piston and brake spring in the braking oil pocket, brake spring's top contacts with the top inner wall of braking oil pocket, brake piston's bottom contacts with brake piston's top, brake piston's bottom is worn to pass the bottom accent and is contacted with brake push rod's top, brake piston's side wall is along the side inner wall sliding fit from top to bottom of braking oil pocket, set up the bolt hole on the nearly valve end in the rocking arm in order to carry out threaded connection cooperation with adjusting bolt, adjusting bolt's bolt inner is located the inside of the ring channel of seting up on the brake piston side wall, when using, this design can carry out two kinds of adjustment valve clearance schemes, and braking/non-braking operating mode operation. The design is simple in structure, small in occupied space, easy to assemble, capable of adjusting the valve clearance, capable of optimizing the assembling and adjusting beat and easy to operate.
Description
Technical Field
The invention relates to an engine brake executing device, belongs to the technical field of vehicle engine brake, and particularly relates to an adjustable engine brake executing mechanism and a use method thereof, which are particularly suitable for simplifying a structure, reducing occupied space and being capable of variously adjusting valve clearances.
Background
At present, the technology of realizing the deceleration or smooth downhill of the whole vehicle by engine braking is widely applied, and the engine braking can be classified into a bleeder type braking, a compression type braking and a high-power braking according to the braking effect, and is commonly used as a compression type braking. The engine brake actuating mechanism has various forms, generally divided into hydraulic type and solid chain type, but most of brake actuating mechanisms have the defects of complex structure, high manufacturing cost and patent protection.
The invention patent application with the application publication number of CN102817665A and the application publication number of 2012 and 12 months discloses a valve actuating device driven by an auxiliary cam and provided with a torsion spring, which comprises an exhaust rocker arm, an auxiliary rocker arm and a rocker arm shaft, wherein the auxiliary rocker arm comprises a rocker arm device, an oil hole device and a valve hole device, an oil way device is arranged on the rocker arm shaft, the exhaust rocker arm and the auxiliary rocker arm are adjacently arranged on the rocker arm shaft, an auxiliary cam is additionally arranged on a cam shaft of an engine, the auxiliary cam drives the auxiliary rocker arm to rotate around the rocker arm shaft, engine oil is filled in a driven valve hole of the auxiliary rocker arm when the valve actuating device works, the lift action of the auxiliary cam drives the auxiliary rocker arm to enable an exhaust valve to be opened for engine braking or internal EGR, the torsion spring is arranged on the auxiliary rocker arm and the rocker arm shaft, and the torsion spring presses the auxiliary rocker arm to the auxiliary cam to enable the auxiliary rocker arm to be contacted with the auxiliary cam. While this design can extend the service life of the engine, it still suffers from the following drawbacks:
Firstly, the auxiliary rocker arm in the design is used as an actuating mechanism for engine braking, and an adjusting bolt, a limiting sleeve, a driven spring, a check ring and a driven valve are arranged in the auxiliary rocker arm and are used as a driving mechanism for driving an exhaust valve, so that the auxiliary rocker arm has the advantages that the number of parts is large, the structure is complex, and the adjusting bolt is positioned right above the auxiliary rocker arm, so that the occupied space is enlarged, and the use is not facilitated;
and secondly, the valve clearance cannot be adjusted by the design, so that the application quality is reduced, and the application range is narrowed.
The disclosure of this background section is only intended to increase the understanding of the general background of the present patent application and should not be taken as an admission or any form of suggestion that this information forms the prior art already known to a person of ordinary skill in the art.
Disclosure of Invention
The invention aims to overcome the defects and problems of complex structure, large occupied space and incapability of adjusting valve clearances in the prior art, and provides an adjustable engine brake actuating mechanism which is simple in structure, small in occupied space and capable of adjusting the valve clearances and a using method thereof.
In order to achieve the above object, the technical solution of the present invention is: an adjustable engine brake actuating mechanism comprises a rocker arm and a brake oil way and a brake oil cavity which are arranged in the rocker arm, wherein a driver is arranged in the brake oil cavity, the bottom of the driver passes through a bottom cavity opening of the brake oil cavity and then contacts with the top end of a brake push rod, the bottom end of the brake push rod contacts with the top end of an exhaust valve, and the brake oil way is communicated with the brake oil cavity;
The driver comprises a brake piston and a brake spring, wherein the top end of the brake spring is contacted with the top inner wall of the brake oil cavity, the bottom end of the brake spring is contacted with the top end of the brake piston, the bottom end of the brake piston penetrates through the bottom cavity opening and then is contacted with the top end of the brake push rod, the side wall of the brake piston is in sliding fit up and down along the side inner wall of the brake oil cavity, and an annular groove is formed in the side wall of the brake piston;
The two ends of the rocker arm are respectively a near valve end and a near cam end, the near cam end is in transmission fit with the cam, a bolt hole is formed in the near valve end to be in threaded connection fit with an adjusting bolt passing through the near valve end, the inner end of a bolt of the adjusting bolt is located in the annular groove, and the outer end of the bolt of the adjusting bolt extends to the outside of the rocker arm after passing through the bolt hole.
The cross section of the annular groove is a trapezoid surface, the parts of the trapezoid surface, which are contacted with the brake piston and the side inner wall, are respectively a trapezoid inner end surface and a trapezoid outer end surface, the trapezoid inner end surface is narrower than the trapezoid outer end surface, and the cross section of the inner end of the upper bolt of the adjusting bolt is also trapezoid.
The outer end of the bolt on the adjusting bolt is in threaded connection with an adjusting nut positioned outside the rocker arm.
The brake spring comprises an upper belleville spring and a lower belleville spring which are mutually overlapped, and the upper belleville spring and the lower belleville spring are arranged symmetrically up and down; the top of the upper belleville spring is contacted with the top inner wall, the bottom of the upper belleville spring is contacted with the top of the lower belleville spring, and the bottom of the lower belleville spring is contacted with the top end of the brake piston; the top of the upper belleville spring is wider than the bottom thereof; the top of the lower belleville spring is narrower than the bottom thereof.
The top of the brake piston is connected with the bottom of the piston ejector rod, the top of the piston ejector rod is connected with the middle of the lower belleville spring, the bottom of the brake piston is connected with the top of the piston bottom rod, and the bottom of the piston bottom rod is in contact with the top of the brake push rod.
The brake oil way comprises an outer connecting oil hole, an oil way guide groove, a control valve oil inlet way, an oil way control valve and a control valve oil outlet way, and one end of the outer connecting oil hole is communicated with the brake oil cavity after sequentially passing through the oil way guide groove, the control valve oil inlet way, the oil way control valve and the control valve oil outlet way.
The other end of the outer connecting oil hole is communicated with a main lubricating oil way of the engine, the outer connecting oil hole is arranged in a rocker arm shaft, the rocker arm shaft is embedded into the rocker arm, and the rocker arm shaft is provided with a lubricating oil hole.
The application method of the adjustable engine brake actuating mechanism comprises a valve clearance adjusting step, wherein the valve clearance adjusting step is as follows:
Under the condition that oil is not contained in the brake oil cavity, the base circle of the cam is firstly contacted with the near cam end on the rocker arm, then the bolt inner end of the adjusting bolt is inserted into the annular groove, and then the brake piston is slid up and down to execute any one of the following two clearance adjustment schemes:
a first gap adjustment scheme: the brake piston slides downwards until the upper groove end of the annular groove is contacted with the inner end of the bolt, at the moment, the clearance value between the brake piston and the brake push rod is set as the cold clearance of the valve mechanism, and then the outer end of the bolt is locked to complete the clearance adjustment scheme;
A second gap adjustment scheme: the brake piston is slid upwards until the lower groove end of the annular groove is contacted with the inner end of the bolt, at the moment, the clearance value between the brake piston and the brake push rod is set to be the sum of the cold clearance of the valve mechanism and the stroke of the brake piston, and then the outer end of the bolt is locked to complete the clearance adjustment scheme.
The application method of the adjustable engine brake actuating mechanism comprises the step of non-braking working conditions, wherein the step of non-braking working conditions refers to:
The brake oil way is closed firstly to enable inorganic oil to enter the brake oil chamber, then the cam is rotated to jack up the near cam end on the rocker arm, the rocker arm rotates around the rocker arm shaft arranged in the rocker arm, and then when the brake piston is contacted with the brake push rod, the brake spring is stressed to be compressed, and the brake push rod and the exhaust valve do not act.
The application method of the adjustable engine brake actuating mechanism comprises the step of braking working conditions, wherein the step of braking working conditions refers to:
The high-pressure oil entering the brake oil cavity can drive the brake piston to slide downwards until the upper groove end of the annular groove is contacted with the inner end of the bolt, then the cam is rotated to jack up the near cam end on the rocker arm, the rocker arm rotates around the rocker arm shaft arranged in the rocker arm, then when the brake piston is contacted with the brake push rod, the reaction force of the exhaust valve acts on the brake piston through the brake push rod, so that a high-pressure cavity is formed in the brake oil cavity, the high-pressure oil in the brake oil cavity can not flow into the brake oil cavity any more, the brake oil cavity and the high-pressure oil in the brake oil cavity form a rigid closed oil cavity together, then when the lift of the cam is continuously increased, the cam continuously jacks up the near cam end, the rocker arm continuously rotates around the rocker arm shaft arranged in the rocker arm, and at the moment, the brake piston drives the exhaust valve to act through the brake push rod.
Compared with the prior art, the invention has the beneficial effects that:
1. the invention relates to an adjustable engine brake actuating mechanism and a use method thereof, wherein a driver used for driving an exhaust valve only comprises two parts, namely a brake piston and a brake spring, the number of parts is small, the brake spring and the brake piston are arranged up and down in a brake oil cavity, the driving fit is clear and clear, the assembly is easy, in addition, an annular groove is formed on the side wall of the brake piston to be matched with an adjusting bolt arranged on the side part of a rocker arm, so as to realize different adjustment of a valve clearance, thereby selecting a convenient adjustment mode according to actual conditions, optimizing the assembly and adjustment beat, and being convenient to operate and small in occupied space. Therefore, the invention has the advantages of simple structure, small occupied space, easy assembly, adjustable valve clearance, optimized assembling and adjusting beat and easy operation.
2. In the adjustable engine brake actuating mechanism and the use method thereof, the cross section of the annular groove is preferably a trapezoid surface, the trapezoid inner end surface on the trapezoid surface is narrower than the trapezoid outer end surface, and meanwhile, the cross section of the bolt inner end on the adjusting bolt is also preferably a trapezoid, at the moment, the bolt inner end inserted into the annular groove can be matched with the annular groove more closely, and the effect of adjusting the valve clearance is improved. Therefore, the valve clearance adjustment effect of the present invention is good.
3. The invention relates to an adjustable engine brake actuating mechanism and a use method thereof, wherein a brake spring comprises an upper belleville spring and a lower belleville spring which are mutually overlapped and are vertically symmetrically arranged, the structures of the upper belleville spring and the lower belleville spring are basically consistent, when the adjustable engine brake actuating mechanism is arranged, the upper belleville spring is wide at the upper part and the lower belleville spring is narrow at the lower part, the design can realize compression adjustment so as to change the size of a space above a brake piston, thereby realizing the adjustment of a valve clearance, the operation under a braking working condition and a non-braking working condition, and compared with the rest of springs, the belleville spring saves more assembly space, has larger compression amount when being stressed, and has lower requirement on space, thereby further optimizing the designable range of the actuating mechanism, having larger applicability, and in addition, the overlapped use of the upper belleville spring and the lower belleville spring is beneficial to the arrangement of mechanical impact when an exhaust rocker arm/a brake rocker arm is integrally arranged, and the noise of a valve mechanism can be obviously reduced. Therefore, the invention not only can realize the adjustment of the valve clearance, but also can realize the operation under the braking working condition/non-braking working condition, and can save the assembly space, enlarge the application range and obviously reduce the noise of the valve mechanism.
4. The invention relates to an adjustable engine brake actuating mechanism and a use method thereof, wherein a brake oil way comprises an outer connecting oil hole, an oil way guide groove, a control valve oil inlet way, an oil way control valve and a control valve oil outlet way. Therefore, the invention can adjust the engine oil entering the brake oil cavity so as to be beneficial to forming a high-pressure cavity, thereby realizing braking and releasing braking.
Drawings
Fig. 1 is a schematic view of the structure of the present invention when the valve clearance adjustment is performed.
FIG. 2 is a schematic illustration of the present invention in a non-braking condition.
FIG. 3 is a schematic illustration of the present invention in a braking mode.
In the figure: the exhaust valve 1, the rocker arm 2, the near valve end 21, the near cam end 22, the bolt hole 23, the rocker shaft 24, the lubrication oil hole 25, the brake oil passage 3, the outer oil connecting hole 31, the oil passage guide groove 32, the control valve oil passage 33, the oil passage control valve 34, the control valve oil passage 35, the brake oil chamber 4, the bottom chamber port 41, the top inner wall 42, the side inner wall 43, the driver 5, the brake push rod 51, the valve yoke 52, the brake piston 6, the annular groove 61, the upper groove end 611, the lower groove end 612, the trapezoidal surface 62, the trapezoidal inner end surface 63, the trapezoidal outer end surface 64, the piston rod 65, the piston rod 66, the brake spring 7, the upper butterfly spring 71, the lower butterfly spring 72, the cam 8, the base circle 81, the boss 82, the adjusting bolt 9, the bolt inner end 91, the bolt outer end 92, and the adjusting nut 93.
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings and detailed description.
Referring to fig. 1 to 3, an adjustable engine brake actuating mechanism comprises a rocker arm 2, a brake oil way 3 and a brake oil cavity 4, wherein the brake oil way 3 and the brake oil cavity 4 are arranged in the rocker arm, a driver 5 is arranged in the brake oil cavity 4, the bottom of the driver 5 passes through a bottom cavity opening 41 of the brake oil cavity 4 and then contacts with the top end of a brake push rod 51, the bottom end of the brake push rod 51 contacts with the top end of an exhaust valve 1, and the brake oil way 3 is communicated with the brake oil cavity 4;
The driver 5 comprises a brake piston 6 and a brake spring 7, wherein the top end of the brake spring 7 is contacted with the top inner wall 42 of the brake oil cavity 4, the bottom end of the brake spring 7 is contacted with the top end of the brake piston 6, the bottom end of the brake piston 6 passes through the bottom cavity opening 41 and then is contacted with the top end of the brake push rod 51, the side wall of the brake piston 6 is in sliding fit up and down along the side inner wall 43 of the brake oil cavity 4, and an annular groove 61 is formed in the side wall of the brake piston 6;
The two ends of the rocker arm 2 are respectively provided with a near valve end 21 and a near cam end 22, the near cam end 22 is in transmission fit with the cam 8, the near valve end 21 is provided with a bolt hole 23 for threaded connection fit with an adjusting bolt 9 passing through the near valve end 21, the bolt inner end 91 of the adjusting bolt 9 is positioned in the annular groove 61, and the bolt outer end 92 of the adjusting bolt 9 extends to the outside of the rocker arm 2 after passing through the bolt hole 23.
The cross section of the annular groove 61 is a trapezoid surface 62, the contact parts of the trapezoid surface 62 with the brake piston 6 and the side inner wall 43 are a trapezoid inner end surface 63 and a trapezoid outer end surface 64 respectively, the trapezoid inner end surface 63 is narrower than the trapezoid outer end surface 64, and the cross section of the upper bolt inner end 91 of the adjusting bolt 9 is also trapezoid.
The outer end 92 of the adjusting bolt 9 is screwed with an adjusting nut 93 located outside the rocker arm 2.
The brake spring 7 comprises an upper belleville spring 71 and a lower belleville spring 72 which are mutually overlapped, and the upper belleville spring 71 and the lower belleville spring 72 are arranged in an up-down symmetrical way; the top of the upper belleville spring 71 is contacted with the top inner wall 42, the bottom of the upper belleville spring 71 is contacted with the top of the lower belleville spring 72, and the bottom of the lower belleville spring 72 is contacted with the top end of the brake piston 6; the top of the upper belleville spring 71 is wider than the bottom thereof; the top of the lower belleville spring 72 is narrower than the bottom thereof.
The top of the brake piston 6 is connected with the bottom of the piston ejector rod 65, the top of the piston ejector rod 65 is connected with the middle of the lower belleville spring 72, the bottom of the brake piston 6 is connected with the top of the piston bottom rod 66, and the bottom of the piston bottom rod 66 is in contact with the top of the brake push rod 51.
The brake oil path 3 comprises an outer oil connecting hole 31, an oil path guide groove 32, a control valve oil inlet path 33, an oil path control valve 34 and a control valve oil outlet path 35, and one end of the outer oil connecting hole 31 is communicated with the brake oil cavity 4 after passing through the oil path guide groove 32, the control valve oil inlet path 33, the oil path control valve 34 and the control valve oil outlet path 35 in sequence.
The other end of the outer oil connecting hole 31 is communicated with a main lubricating oil path of the engine, the outer oil connecting hole 31 is formed in the rocker arm shaft 24, the rocker arm shaft 24 is embedded in the rocker arm 2, and the rocker arm shaft 24 is provided with a lubricating oil hole 25.
The application method of the adjustable engine brake actuating mechanism comprises a valve clearance adjusting step, wherein the valve clearance adjusting step is as follows:
in the absence of oil in the brake oil chamber 4, the base circle 81 of the cam 8 is brought into contact with the near cam end 22 on the rocker arm 2, the inner bolt end 91 of the adjusting bolt 9 is inserted into the annular groove 61, and the brake piston 6 is slid up and down to perform either of the following two lash adjustment schemes:
A first gap adjustment scheme: the brake piston 6 is slid downwards until the upper groove end 611 of the annular groove 61 is contacted with the bolt inner end 91, at this time, the clearance value between the brake piston 6 and the brake push rod 51 is set as the cold clearance of the valve train, and then the bolt outer end 92 is locked to complete the clearance adjustment scheme;
A second gap adjustment scheme: the brake piston 6 is slid upward until the lower groove end 612 of the annular groove 61 contacts the plug inner end 91, at which time the clearance between the brake piston 6 and the brake push rod 51 is set to the sum of the cold clearance of the valve train and the travel of the brake piston 6, and the plug outer end 92 is locked to complete the clearance adjustment scheme.
The application method of the adjustable engine brake actuating mechanism comprises the step of non-braking working conditions, wherein the step of non-braking working conditions refers to:
The brake oil path 3 is closed to enable inorganic oil to enter the brake oil cavity 4, the cam 8 is rotated to jack up the near cam end 22 on the rocker arm 2, the rocker arm 2 rotates around the rocker arm shaft 24 arranged in the rocker arm 2, and then when the brake piston 6 is contacted with the brake push rod 51, the brake spring 7 is stressed and compressed, and the brake push rod 51 and the exhaust valve 1 do not act.
The application method of the adjustable engine brake actuating mechanism comprises the step of braking working conditions, wherein the step of braking working conditions refers to:
The pilot passes through the brake oil path 3 to enable high-pressure oil to enter the brake oil path 4, the high-pressure oil entering the brake oil path 4 drives the brake piston 6 to slide downwards until the upper groove end 611 of the annular groove 61 is in contact with the bolt inner end 91, then the cam 8 is rotated to jack up the near cam end 22 on the rocker arm 2, the rocker arm 2 rotates around the rocker arm shaft 24 arranged in the rocker arm 2, then when the brake piston 6 is in contact with the brake push rod 51, the reaction force of the exhaust valve 1 acts on the brake piston 6 through the brake push rod 51, so that a high-pressure cavity is formed in the brake oil path 4, the high-pressure oil in the brake oil path 3 is prevented from flowing into the brake oil path 4, the brake oil path 4 and the high-pressure oil existing in the brake oil path form a rigid closed oil cavity together, then when the lift of the cam 8 is continuously increased, the cam 8 continuously jacks up the near cam end 22, the rocker arm 2 continuously rotates around the rocker arm shaft 24 arranged in the rocker arm, and at the moment, the brake piston 6 drives the exhaust valve 1 to act through the brake push rod 51.
The principle of the invention is explained as follows:
The rocker arm 2 described in the present invention refers to an engine exhaust rocker arm or a dedicated brake rocker arm. The yoke 52 of the present invention is also referred to as a valve bridge.
In the present invention, "when the lift of the cam 8 continues to be increased" means that: the cam 8 includes a base circle 81 and a boss 82 provided thereon, and the lift of the cam 8 is the height of the boss 82 on the cam 8 relative to the base circle 81, and the lift of the cam 8 continues to increase, which means the process of moving the cam-approaching end 22 on the rocker arm 2 from contact with the base circle 81 to contact with the boss 82.
The function of the oil circuit control valve 34 in the present invention: when the reaction force of the exhaust valve 1 to the rocker arm 2 is excessive, if the oil passage control valve 34 is not provided, a high-pressure chamber cannot be formed in the brake oil chamber 4, and engine oil can flow back to the control valve oil inlet passage 33, the oil passage guide groove 32 and the outer oil connecting hole 31 in sequence. When the high-pressure chamber is formed in the brake oil chamber 4, the engine oil flows back from the brake oil chamber 4 to the control valve oil outlet passage 35, and the oil passage control valve 34 is free of the engine oil. After the braking is released (i.e., when there is no oil pressure in the control valve oil inlet path 33), the oil path control valve 34 forms an oil drain path to directly drain the oil in the control valve oil outlet path 35
Example 1:
Referring to fig. 1 to 3, an adjustable engine brake actuating mechanism comprises a rocker arm 2, a brake oil way 3 and a brake oil cavity 4, wherein the brake oil way 3 and the brake oil cavity 4 are arranged in the rocker arm, a driver 5 is arranged in the brake oil cavity 4, the bottom of the driver 5 passes through a bottom cavity opening 41 of the brake oil cavity 4 and then contacts with the top end of a brake push rod 51, the bottom end of the brake push rod 51 contacts with the top end of an exhaust valve 1, and the brake oil way 3 is communicated with the brake oil cavity 4; the driver 5 comprises a brake piston 6 and a brake spring 7, wherein the top end of the brake spring 7 is contacted with the top inner wall 42 of the brake oil cavity 4, the bottom end of the brake spring 7 is contacted with the top end of the brake piston 6, the bottom end of the brake piston 6 passes through the bottom cavity opening 41 and then is contacted with the top end of the brake push rod 51, the side wall of the brake piston 6 is in sliding fit up and down along the side inner wall 43 of the brake oil cavity 4, and an annular groove 61 is formed in the side wall of the brake piston 6; the two ends of the rocker arm 2 are respectively provided with a near valve end 21 and a near cam end 22, the near cam end 22 is in transmission fit with the cam 8, the near valve end 21 is provided with a bolt hole 23 for threaded connection fit with an adjusting bolt 9 passing through the near valve end 21, the bolt inner end 91 of the adjusting bolt 9 is positioned in the annular groove 61, and the bolt outer end 92 of the adjusting bolt 9 extends to the outside of the rocker arm 2 after passing through the bolt hole 23.
Example 2:
The basic content is the same as in example 1, except that:
The application method of the adjustable engine brake actuating mechanism comprises a valve clearance adjusting step, wherein the valve clearance adjusting step is as follows:
in the absence of oil in the brake oil chamber 4, the base circle 81 of the cam 8 is brought into contact with the near cam end 22 on the rocker arm 2, the inner bolt end 91 of the adjusting bolt 9 is inserted into the annular groove 61, and the brake piston 6 is slid up and down to perform either of the following two lash adjustment schemes:
A first gap adjustment scheme: the brake piston 6 is slid downwards until the upper groove end 611 of the annular groove 61 is contacted with the bolt inner end 91, at this time, the clearance value between the brake piston 6 and the brake push rod 51 is set as the cold clearance of the valve train, and then the bolt outer end 92 is locked to complete the clearance adjustment scheme;
A second gap adjustment scheme: the brake piston 6 is slid upward until the lower groove end 612 of the annular groove 61 contacts the plug inner end 91, at which time the clearance between the brake piston 6 and the brake push rod 51 is set to the sum of the cold clearance of the valve train and the travel of the brake piston 6, and the plug outer end 92 is locked to complete the clearance adjustment scheme.
Example 3:
The basic content is the same as in example 1, except that:
The application method of the adjustable engine brake actuating mechanism comprises the step of non-braking working conditions, wherein the step of non-braking working conditions refers to:
The brake oil path 3 is closed to enable inorganic oil to enter the brake oil cavity 4, the cam 8 is rotated to jack up the near cam end 22 on the rocker arm 2, the rocker arm 2 rotates around the rocker arm shaft 24 arranged in the rocker arm 2, and then when the brake piston 6 is contacted with the brake push rod 51, the brake spring 7 is stressed and compressed, and the brake push rod 51 and the exhaust valve 1 do not act.
Example 4:
The basic content is the same as in example 1, except that:
The application method of the adjustable engine brake actuating mechanism comprises the step of braking working conditions, wherein the step of braking working conditions refers to:
The pilot passes through the brake oil path 3 to enable high-pressure oil to enter the brake oil path 4, the high-pressure oil entering the brake oil path 4 drives the brake piston 6 to slide downwards until the upper groove end 611 of the annular groove 61 is in contact with the bolt inner end 91, then the cam 8 is rotated to jack up the near cam end 22 on the rocker arm 2, the rocker arm 2 rotates around the rocker arm shaft 24 arranged in the rocker arm 2, then when the brake piston 6 is in contact with the brake push rod 51, the reaction force of the exhaust valve 1 acts on the brake piston 6 through the brake push rod 51, so that a high-pressure cavity is formed in the brake oil path 4, the high-pressure oil in the brake oil path 3 is prevented from flowing into the brake oil path 4, the brake oil path 4 and the high-pressure oil existing in the brake oil path form a rigid closed oil cavity together, then when the lift of the cam 8 is continuously increased, the cam 8 continuously jacks up the near cam end 22, the rocker arm 2 continuously rotates around the rocker arm shaft 24 arranged in the rocker arm, and at the moment, the brake piston 6 drives the exhaust valve 1 to act through the brake push rod 51.
Example 5:
The basic content is the same as in example 1, except that:
The brake spring 7 comprises an upper belleville spring 71 and a lower belleville spring 72 which are mutually overlapped, and the upper belleville spring 71 and the lower belleville spring 72 are arranged in an up-down symmetrical way; the top of the upper belleville spring 71 is contacted with the top inner wall 42, the bottom of the upper belleville spring 71 is contacted with the top of the lower belleville spring 72, and the bottom of the lower belleville spring 72 is contacted with the top end of the brake piston 6; the top of the upper belleville spring 71 is wider than the bottom thereof; the top of the lower belleville spring 72 is narrower than the bottom thereof. Preferably, the top end of the brake piston 6 is connected to the bottom end of the piston ejector rod 65, the top end of the piston ejector rod 65 is connected to the middle of the lower belleville spring 72, the bottom end of the brake piston 6 is connected to the top end of the piston bottom rod 66, and the bottom end of the piston bottom rod 66 is in contact with the top end of the brake push rod 51.
Example 6:
The basic content is the same as in example 1, except that:
The brake oil path 3 comprises an outer oil connecting hole 31, an oil path guide groove 32, a control valve oil inlet path 33, an oil path control valve 34 and a control valve oil outlet path 35, and one end of the outer oil connecting hole 31 is communicated with the brake oil cavity 4 after passing through the oil path guide groove 32, the control valve oil inlet path 33, the oil path control valve 34 and the control valve oil outlet path 35 in sequence. The other end of the outer oil connecting hole 31 is preferably communicated with a main engine lubricating oil passage, the outer oil connecting hole 31 is arranged in the rocker arm shaft 24, the rocker arm shaft 24 is embedded in the rocker arm 2, and the rocker arm shaft 24 is provided with a lubricating oil hole 25.
The above description is merely of preferred embodiments of the present invention, and the scope of the present invention is not limited to the above embodiments, but all equivalent modifications or variations according to the present disclosure will be within the scope of the claims.
Claims (7)
1. The utility model provides an engine braking actuating mechanism with adjustable, includes rocking arm (2) and inside braking oil circuit (3), the braking oil pocket (4) that set up thereof, the inside of braking oil pocket (4) is provided with driver (5), and the bottom of this driver (5) is worn to contact with the top of braking push rod (51) behind bottom pocket mouth (41) of braking oil pocket (4), and the bottom of braking push rod (51) contacts with the top of exhaust valve (1), and braking oil circuit (3) communicate with each other with braking oil pocket (4), its characterized in that:
The driver (5) comprises a brake piston (6) and a brake spring (7), the top end of the brake spring (7) is in contact with the top inner wall (42) of the brake oil cavity (4), the bottom end of the brake spring (7) is in contact with the top end of the brake piston (6), the bottom end of the brake piston (6) passes through a bottom cavity opening (41) and then is in contact with the top end of a brake push rod (51), the side wall of the brake piston (6) is in sliding fit up and down along the side inner wall (43) of the brake oil cavity (4), and an annular groove (61) is formed in the side wall of the brake piston (6);
the two ends of the rocker arm (2) are respectively a near valve end (21) and a near cam end (22), the near cam end (22) is in transmission fit with the cam (8), a bolt hole (23) is formed in the near valve end (21) so as to be in threaded connection fit with an adjusting bolt (9) passing through the near valve end, a bolt inner end (91) of the adjusting bolt (9) is positioned in the annular groove (61), and a bolt outer end (92) of the adjusting bolt (9) extends to the outside of the rocker arm (2) after passing through the bolt hole (23);
The cross section of the annular groove (61) is a trapezoid surface (62), the parts of the trapezoid surface (62) which are contacted with the brake piston (6) and the side inner wall (43) are respectively a trapezoid inner end surface (63) and a trapezoid outer end surface (64), the trapezoid inner end surface (63) is narrower than the trapezoid outer end surface (64), and the cross section of the upper bolt inner end (91) of the adjusting bolt (9) is also trapezoid;
The brake spring (7) comprises an upper belleville spring (71) and a lower belleville spring (72) which are mutually overlapped, and the upper belleville spring (71) and the lower belleville spring (72) are arranged symmetrically up and down; the top of the upper belleville spring (71) is contacted with the top inner wall (42), the bottom of the upper belleville spring (71) is contacted with the top of the lower belleville spring (72), and the bottom of the lower belleville spring (72) is contacted with the top of the brake piston (6); the top of the upper belleville spring (71) is wider than the bottom thereof; the top of the lower belleville spring (72) is narrower than the bottom thereof;
The brake oil way (3) comprises an outer connecting oil hole (31), an oil way guide groove (32), a control valve oil inlet way (33), an oil way control valve (34) and a control valve oil outlet way (35), and one end of the outer connecting oil hole (31) is communicated with the brake oil cavity (4) after passing through the oil way guide groove (32), the control valve oil inlet way (33), the oil way control valve (34) and the control valve oil outlet way (35) in sequence.
2. An adjustable engine brake actuator according to claim 1, wherein: the outer end (92) of the bolt on the adjusting bolt (9) is in threaded connection with an adjusting nut (93) positioned outside the rocker arm (2).
3. An adjustable engine brake actuator according to claim 1, wherein: the top of brake piston (6) is connected with the bottom of piston ejector pin (65), and the top of piston ejector pin (65) is connected with the middle part of lower belleville spring (72), the bottom of brake piston (6) is connected with the top of piston sill bar (66), and the bottom of piston sill bar (66) contacts with the top of brake push rod (51).
4. An adjustable engine brake actuator according to claim 3, wherein: the other end of the outer connecting oil hole (31) is communicated with a main lubricating oil way of the engine, the outer connecting oil hole (31) is formed in the rocker arm shaft (24), the rocker arm shaft (24) is embedded into the rocker arm (2), and the lubricating oil hole (25) is formed in the rocker arm shaft (24).
5. A method of using the adjustable engine brake actuator of claim 1, wherein: the using method comprises a step of adjusting the valve clearance, wherein the step of adjusting the valve clearance refers to:
Under the condition that oil is not contained in the brake oil cavity (4), a base circle (81) of a cam (8) is firstly contacted with a near cam end (22) on a rocker arm (2), then a bolt inner end (91) of an adjusting bolt (9) is inserted into an annular groove (61), and then the brake piston (6) is slid up and down to execute any one of the following two clearance adjustment schemes:
A first gap adjustment scheme: the brake piston (6) slides downwards until the upper groove end (611) of the annular groove (61) is contacted with the bolt inner end (91), at the moment, the clearance value between the brake piston (6) and the brake push rod (51) is set as a cold clearance of the valve mechanism, and then the bolt outer end (92) is locked to complete the clearance adjustment scheme;
A second gap adjustment scheme: the brake piston (6) is slid upwards until the lower groove end (612) of the annular groove (61) is in contact with the bolt inner end (91), at this time, the clearance value between the brake piston (6) and the brake push rod (51) is set to be the sum of the cold clearance of the valve train and the stroke of the brake piston (6), and then the bolt outer end (92) is locked to complete the clearance adjustment scheme.
6. A method of using the adjustable engine brake actuator of claim 1, wherein: the using method comprises the step of non-braking working conditions, wherein the step of non-braking working conditions refers to the following steps:
The brake oil way (3) is closed firstly to enable inorganic oil to enter the brake oil cavity (4), then the cam (8) is rotated to jack up the near cam end (22) on the rocker arm (2), the rocker arm (2) rotates around the rocker arm shaft (24) arranged in the rocker arm, then when the brake piston (6) is in contact with the brake push rod (51), the brake spring (7) is stressed to be compressed, and the brake push rod (51) and the exhaust valve (1) do not act.
7. A method of using the adjustable engine brake actuator of claim 1, wherein: the using method comprises a braking working condition step, wherein the braking working condition step refers to:
The brake oil way (3) is conducted firstly so that high-pressure oil enters the brake oil way (4), the high-pressure oil entering the brake oil way (4) drives the brake piston (6) to slide downwards until the upper groove end (611) of the annular groove (61) is in contact with the bolt inner end (91), the cam (8) is rotated again to jack up the near cam end (22) on the rocker arm (2), the rocker arm (2) rotates around a rocker arm shaft (24) arranged in the rocker arm, then when the brake piston (6) is in contact with the brake push rod (51), the reaction force of the exhaust valve (1) acts on the brake piston (6) through the brake push rod (51), so that a high-pressure cavity is formed in the brake oil way (4), the high-pressure oil in the brake oil way (3) does not flow into the brake oil way (4), the brake oil way (4) and the high-pressure oil existing in the brake oil way form a rigid closed oil cavity together, and then when the lift of the cam (8) is continuously increased, the cam (8) continuously jacks up the near cam end (24), the rocker arm (2) continuously rotates around the rocker arm shaft (24) arranged in the brake push rod (51), and the exhaust valve (1) is continuously driven to rotate around the brake push rod (6) through the brake push rod (51).
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| US7789065B2 (en) * | 2008-07-09 | 2010-09-07 | Zhou Yang | Engine braking apparatus with mechanical linkage and lash adjustment |
| US8065987B2 (en) * | 2009-01-05 | 2011-11-29 | Zhou Yang | Integrated engine brake with mechanical linkage |
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| JP2004183516A (en) * | 2002-11-29 | 2004-07-02 | Nippon Piston Ring Co Ltd | Valve mechanism |
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