CN110566309B - Compression release type engine in-cylinder braking device - Google Patents
Compression release type engine in-cylinder braking device Download PDFInfo
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- CN110566309B CN110566309B CN201910996869.9A CN201910996869A CN110566309B CN 110566309 B CN110566309 B CN 110566309B CN 201910996869 A CN201910996869 A CN 201910996869A CN 110566309 B CN110566309 B CN 110566309B
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- 230000006835 compression Effects 0.000 title claims abstract description 27
- 238000007906 compression Methods 0.000 title claims abstract description 27
- 239000003921 oil Substances 0.000 claims abstract description 227
- 238000005086 pumping Methods 0.000 claims abstract description 28
- 239000010705 motor oil Substances 0.000 claims abstract description 19
- 239000010727 cylinder oil Substances 0.000 claims description 16
- 230000002093 peripheral effect Effects 0.000 claims description 3
- 238000006243 chemical reaction Methods 0.000 abstract description 2
- 238000013459 approach Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 230000001174 ascending effect Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 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
- 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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- 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
- F01L9/00—Valve-gear or valve arrangements actuated non-mechanically
- F01L9/10—Valve-gear or valve arrangements actuated non-mechanically by fluid means, e.g. hydraulic
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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 invention discloses a compression release type engine in-cylinder braking device, wherein in a pair of cylinders with 360-degree crank angles, an exhaust mechanism of one cylinder A is provided with an oil cylinder device, an air inlet mechanism of the other cylinder B is provided with an oil pumping device, the oil pumping device is controlled by the air inlet mechanism of the cylinder B, engine oil of an engine is pumped into the oil cylinder device so as to drive a valve rocker of the exhaust mechanism of the cylinder A to swing, and therefore an exhaust valve of the exhaust mechanism of the cylinder A is jacked up to realize release braking. The device can realize the conversion between braking and non-braking only by controlling the on/off of the switch electromagnetic valve, has low requirement on a control circuit, works stably and reliably, has low failure rate, and is particularly suitable for multi-cylinder four-stroke engines with even number of cylinders.
Description
Technical Field
The invention relates to the technical field of in-cylinder braking of engines, in particular to a compression release type in-cylinder braking device of an engine.
Background
The in-cylinder braking technology of the engine mainly goes through the development processes of exhaust butterfly valve braking, air leakage braking, compression release braking and the like, wherein the compression release braking technology is the technology with the best engine braking performance at present, and the basic principle is as follows: when the engine is towed backward, the piston compresses gas in the cylinder in the process of ascending the compression stroke piston, and braking power is generated. Before compression top dead center, the compression release type braking device drives the exhaust valve to open a certain opening degree, the compressed high-temperature high-pressure charge in the cylinder is discharged, at the moment, the pressure in the cylinder is rapidly reduced, after a certain crank angle is passed, the exhaust valve is closed again, the piston moves downwards, the work of the charge in the cylinder on the piston is greatly reduced because the charge in the cylinder is greatly reduced, and the reverse braking power of the charge in the cylinder on the piston is reduced or eliminated.
Compression release type braking technology is generally combined with exhaust butterfly valve braking, in the exhaust stroke, an exhaust passage of an engine is closed by a butterfly valve, back pressure is built, a piston is subjected to gas pressure in the ascending process, the ascending speed is reduced, the power loss of the piston is increased, and braking power is generated again.
Chinese patent CN201241740Y discloses an integrated brake device for rocker arm of four-stroke internal combustion engine, which is provided with two brake protrusions on the control cam for increasing intake air amount by opening the intake valve before the end of intake stroke and releasing pressure by opening the exhaust valve before the end of compression stroke to realize in-cylinder braking of the engine, and a hydraulic control lash compensation mechanism is required to be provided on the rocker arm in order to cancel valve lift caused by the brake protrusions during normal operation of the engine. Because the normal running state occupies most of the running state of the whole engine, the clearance compensation mechanism is in a working state in most of the running time of the engine, and has higher requirements on reliability and the like, and the structure is more complex.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a compression release type engine in-cylinder braking device, which is used for improving the working reliability and reducing the failure rate.
In order to solve the technical problems, the invention adopts a compression release type engine in-cylinder braking device, which comprises: the engine is a multi-cylinder four-stroke engine with even number of cylinders, the engine comprises a plurality of pairs of cylinders, two cylinders in each pair of cylinders are respectively marked as a cylinder A and a cylinder B, and the phase difference of the two cylinders is 360 DEG crank angle; the oil cylinder device drives a valve rocker of an exhaust mechanism of the cylinder A to swing so as to open an exhaust valve; the oil cylinder device comprises a cylinder body, a first cylinder cover, a second cylinder cover, an oil plug rod and a return spring; the first cylinder cover and the second cylinder cover are respectively arranged at two ends of the cylinder body, the oil plug is arranged in the cylinder body, the oil plug rod is fixed on the oil plug, and the oil plug rod extends out of the first cylinder cover and abuts against the upper end face of the valve rocker; in the cylinder body, a cavity which is positioned between the oil plug and the first cylinder cover and penetrated by the oil plug rod is marked as a rod cavity, a cavity which is positioned between the oil plug and the second cylinder cover is marked as a rodless cavity, and the return spring is sleeved on the oil plug rod and arranged in the rod cavity; the second cylinder cover is provided with a cylinder oil hole, the cylinder oil hole is communicated with the rodless cavity, the cylinder oil hole is communicated with an engine oil path of the engine through a main oil path, the cylinder oil hole is communicated with an oil pan of the engine through an oil cylinder return oil path, the main oil path is provided with an on-off electromagnetic valve and a one-way valve, and the oil cylinder return oil path is provided with a throttling device; the oil pumping device is controlled by an air inlet mechanism of the cylinder B to pump engine oil of an engine into the oil cylinder device so as to drive a valve rocker of an exhaust mechanism of the cylinder A to swing; the oil pumping device comprises a plunger sleeve, a plunger and a plunger return spring, wherein the plunger sleeve and the plunger are coupled parts, the plunger sleeve is provided with a first end part and a second end part, the plunger extends out of the first end part, the plunger return spring is sleeved on the plunger and is clamped between the first end part and the plunger, a cavity in the plunger sleeve between the second end part and the plunger is a plunger oil cavity, the plunger is provided with a plunger oil hole, the peripheral surface of the plunger is provided with an annular oil groove, and the plunger oil hole is communicated with the annular oil groove and the plunger oil cavity; the plunger sleeve oil pump hole is formed in the second end portion, the plunger sleeve oil pump hole is communicated with the main oil way, the plunger sleeve oil pump hole is communicated with the cylinder body oil hole, the plunger sleeve oil return hole is formed in the side wall of the plunger sleeve, an oil pump oil return oil way is arranged between the plunger sleeve oil return hole and the oil pan, and a pressure limiting valve is arranged on the oil pump oil return oil way.
The plunger rod is propped against the exhaust valve side of the valve rocker of the cylinder A exhaust mechanism, and when the switching electromagnetic valve communicates the main oil way with the engine oil way, the plunger rod is propped against the opposite side of the intake valve of the valve rocker of the cylinder B intake mechanism.
The oil plug rod is a stepped shaft, the first end cover is provided with a stepped hole matched with the stepped shaft, and when the oil plug is propped against the end face of the rodless cavity, an axial gap is arranged between the shaft shoulder of the stepped shaft and the hole shoulder of the stepped hole.
The second cylinder cover is provided with an oil collecting cavity which is respectively communicated with the rodless cavity and the cylinder body oil hole.
Wherein, the second cylinder cap with the cylinder body is established as an organic wholely.
Wherein, the oil plug rod and the oil plug are integrated.
Wherein the throttle device is a throttle valve.
Wherein the switch electromagnetic valve is a two-position two-way normally closed switch electromagnetic valve.
The first end of the plunger sleeve is detachably connected with the plunger sleeve, the second end of the plunger sleeve is integrated with the plunger sleeve, or the second end of the plunger sleeve is detachably connected with the plunger sleeve, and the first end of the plunger sleeve is integrated with the plunger sleeve.
The air inlet mechanism of the air cylinder A is provided with the oil pumping device, the air outlet mechanism of the air cylinder B is provided with the oil cylinder device, the cylinder body oil hole of each air cylinder device is communicated with the engine oil path of the engine through one main oil path, and the main oil paths share the same switching electromagnetic valve.
The air inlet mechanism of each air cylinder is provided with one oil pumping device, the air exhaust mechanism of each air cylinder is provided with one oil cylinder device, the cylinder body oil hole of each air cylinder device is communicated with the engine oil path of the engine through one main oil path, and the main oil paths share the same switch electromagnetic valve.
After the technical scheme is adopted, the technical effect of the invention is that in a pair of cylinders with 360-degree crank angles, the exhaust mechanism of one cylinder A is provided with an oil cylinder device, the air inlet mechanism of the other cylinder B is provided with an oil pumping device, the oil pumping device is controlled by the air inlet mechanism of the cylinder B, engine oil of an engine is pumped into the oil cylinder device so as to drive the valve rocker of the exhaust mechanism of the cylinder A to swing, and therefore the exhaust valve of the exhaust mechanism of the cylinder A is jacked up to realize release braking. The device can realize the braking/non-braking conversion of all cylinders of the whole engine by only controlling the on/off of one switch electromagnetic valve, has low requirement on a control circuit, works stably and reliably and has low failure rate, and is particularly suitable for multi-cylinder four-stroke engines with even number of cylinders.
Drawings
FIG. 1 is a schematic view of an embodiment of an in-cylinder brake apparatus for a compression-release engine in accordance with the present invention in a normal operating mode for controlling a pair of cylinders of a six-cylinder four-stroke engine;
FIG. 2 is a schematic illustration of the embodiment of FIG. 1 in an in-cylinder braking mode of the engine;
FIG. 3 is a reference view showing an operating state in which the oil pumping device of the embodiment shown in FIG. 1 is subjected to only the oil pressure when the on-off solenoid valve is opened;
FIG. 4 is a reference diagram of the working state of the oil pumping device in the embodiment shown in FIG. 1 after the on-off solenoid valve is opened, pushed by the valve rocker of the cylinder B air intake mechanism, to pump oil to the oil cylinder device;
FIG. 5 is a reference diagram of the operating state of the oil pumping apparatus of the embodiment of FIG. 1 after the switching solenoid valve is closed;
FIG. 6 is a schematic illustration of the operation of an embodiment of the compression-release engine in-cylinder brake apparatus of the present invention in controlling all cylinders of a six-cylinder four-stroke engine;
In the figure, 10 a-exhaust valve, 11 a-valve spring, 12 a-valve rocker arm, 13 a-rocker arm shaft, 14 a-pushrod, 10 b-intake valve, 11 b-valve spring, 12 b-valve rocker arm, 13 b-rocker arm shaft, 14 b-pushrod, 20-check valve, 30-on-off solenoid valve, 40-cylinder device, 41-cylinder block, 42-oil plug return spring, 43-oil plug, 44-oil collecting cavity, 45-first cylinder head, 46-oil plug rod, 47-cylinder block oil hole, 50-throttle valve, 60-oil pan, 70-oil pumping device, 71-plunger sleeve, 711-plunger sleeve oil pumping hole, 712-plunger sleeve oil return hole, 72-plunger, 721-plunger oil hole, 722-annular oil groove, 73-plunger return spring, 74-plunger oil cavity, 75-pressure limiting valve, H-axial gap.
Detailed Description
The invention will be further described with reference to the drawings and examples.
The working sequence of the six-cylinder four-stroke engine is 1-5-3-6-2-4, namely the phase difference of the 1 st cylinder and the 6 th cylinder is 360 degrees in crank angle, the phase difference of the 2 nd cylinder and the 5 th cylinder is 360 degrees in crank angle, and the phase difference of the 3 rd cylinder and the 4 th cylinder is 360 degrees in crank angle. For simplicity, cylinder 1 will be referred to simply as cylinder 1, cylinder 2 will be referred to simply as cylinder 2, and so on.
Taking 1 cylinder and 6 cylinders as examples, when the 1 cylinder piston approaches compression top dead center, the 6 cylinder piston approaches intake/exhaust top dead center, at this time, the 1 cylinder intake/exhaust valve is closed, the 6 cylinder intake valve starts to open, and the exhaust valve approaches closing.
As shown in fig. 1 and 2, a compression release type in-cylinder brake apparatus for an engine is shown, in which 1 cylinder is designated as a cylinder a and 6 cylinder is designated as a cylinder B for convenience of explanation. The oil pumping device 70 is controlled by the air inlet mechanism of the cylinder B, and engine oil is pumped into the oil cylinder device 40 to drive the valve rocker of the air outlet mechanism of the cylinder A to swing, so that the air outlet valve 10a of the air outlet mechanism of the cylinder A is jacked up to realize release braking.
The valve rocker 12a of the exhaust mechanism of the cylinder a is rotatably mounted on the rocker shaft 13a, the push rod 14a and the exhaust valve 10a are respectively arranged at two sides of the rocker shaft 13a, and when the push rod 14a pushes the valve rocker 12a to swing around the rocker shaft 13a from one side under the action of a cam shaft (not shown), the other side of the valve rocker 12a presses the exhaust valve 10a, so that the valve is opened; when the camshaft rotates by a prescribed angle, the exhaust valve 10a returns under the action of the valve spring 11a, and the valve closes.
Similarly, the valve rocker 12B of the air intake mechanism of the cylinder B is rotatably mounted on the rocker shaft 13B, the push rod 14B and the air intake valve 11B are respectively arranged on two sides of the rocker shaft 13B, and when the push rod 14B pushes the valve rocker 12B to swing around the rocker shaft 13B from one side under the action of a cam shaft (not shown), the other side of the valve rocker 12B presses the air intake valve 10B, so that the valve is opened; when the camshaft rotates by a predetermined angle, the intake valve 10b returns by the valve spring 11b, and the valve closes.
The cylinder device 40 includes a cylinder block 41, a first cylinder head 45, a second cylinder head, an oil plug 43, an oil plug rod 46, and a return spring 42.
The first cylinder head 45 and the second cylinder head are respectively mounted at both ends of the cylinder 41 (in this embodiment, the second cylinder head is integrally provided with the cylinder 41, or may be of a split type structure), the oil plug 43 is provided in the cylinder 41, the oil plug rod 46 is fixed to the oil plug 43 (in this embodiment, the oil plug rod 46 is integrally provided with the oil plug 43, or may be of a split type structure), and the oil plug rod 46 extends from the first cylinder head 45 and abuts against an upper end surface of the valve rocker 12a, which is located on an exhaust valve side of an exhaust rocker of the exhaust mechanism of the cylinder a.
In the cylinder 41, a cavity between the oil plug 43 and the first cylinder head 45 and penetrated by the oil plug rod 46 is denoted as a rod cavity, a cavity between the oil plug 43 and the second cylinder head is denoted as a rodless cavity, and the return spring 42 is sleeved on the oil plug rod 46 and arranged in the rod cavity.
The second cylinder cover is provided with a cylinder oil hole 47, the cylinder oil hole 47 is communicated with the rodless cavity, the cylinder oil hole 47 is communicated with an engine oil path through a main oil path, the cylinder oil hole 47 is communicated with an oil pan 60 of the engine through an oil return path of the oil cylinder, the main oil path is provided with an on-off electromagnetic valve 30 and a check valve 20 (in the embodiment, the on-off electromagnetic valve 30 is a two-position normally closed on-off electromagnetic valve), and a throttling device (in the embodiment, the throttling device is a throttling valve 50, or a throttling hole and other structures) is arranged on the oil return path of the oil cylinder.
In the invention, the second cylinder cover is provided with an oil collecting cavity 44, and the oil collecting cavity 44 is respectively communicated with the rodless cavity and the cylinder body oil hole 47. The oil collecting chamber 44 is provided for the purpose of facilitating the provision of the cylinder oil hole 47, preventing the oil plug 43 from closing the cylinder oil hole 47 when it is located at the end of the cylinder 41.
In the present invention, the oil plug rod 46 is a stepped shaft, the first end cover 45 is provided with a stepped hole adapted to the stepped shaft, and when the oil plug 43 abuts against the end face of the rodless cavity, an axial gap H is provided between a shoulder of the stepped shaft and a shoulder of the stepped hole, and the axial gap H is a stroke of the oil plug 43.
As shown in fig. 3 to 5, the oil pumping device 70 includes a plunger housing 71, a plunger 72, and a plunger return spring 73, the plunger housing 71 and the plunger 72 being coupled members, the plunger housing 71 having a first end portion and a second end portion, the plunger 72 extending from the first end portion, the plunger return spring 73 being disposed around the plunger 72 and being sandwiched between the first end portion and the plunger 72, a cavity between the second end portion and the plunger 72 in the plunger housing 71 being a plunger oil chamber 74, the plunger 72 being provided with a plunger oil hole 721 and an annular oil groove 722 on a peripheral surface, the plunger oil hole communicating the annular oil groove 722 with the plunger oil chamber 74. The second end is provided with a plunger sleeve pump oil hole 711, the plunger sleeve pump oil hole 711 is communicated with the main oil way, the plunger sleeve pump oil hole 711 is communicated with the cylinder oil hole 47, the side wall of the plunger sleeve 71 is provided with a plunger sleeve oil return hole 712, an oil pump oil return way is arranged between the plunger sleeve oil return hole 712 and the oil pan 60, and the oil pump oil return way is provided with a pressure limiting valve 75.
As shown in fig. 2, when the on-off solenoid valve 30 communicates the main oil passage with the engine oil passage, the plunger 72 abuts against the opposite side of the intake valve 10B of the intake rocker arm of the cylinder B intake mechanism.
In the present invention, the plunger housing 71 is detachably connected to the plunger housing 71 at a first end portion thereof, and the plunger housing 71 is integrally formed with the second end portion thereof. The second end portion of the plunger sleeve 71 may be detachably connected to the plunger sleeve 71, and the first end portion may be integrally formed with the plunger sleeve 71.
The working principle of the in-cylinder brake of the invention is explained as follows:
As shown in fig. 1 and 5, when the engine is in the normal operation mode, the switching solenoid valve 30 is turned off, the oil plug 43 of the oil cylinder device 40 is stopped at the tip by the plunger return spring 42, and the plunger 72 of the oil pumping device 70 is stopped at the tip by the plunger return spring 73.
As shown in fig. 2 and 3, when the engine enters the in-cylinder braking mode, the on-off solenoid valve 30 is energized and engine oil enters the oil chambers of the oil cylinder device 40 and the oil pumping device 70 through the main oil passage, the lower end of the plunger 72 of the oil pumping device 70 is pushed to be attached to the upper end face of the valve rocker arm 12B of the air intake mechanism of the cylinder B, and in order to push the oil plug 43 of the oil cylinder device 40 to drive the cylinder a to open the exhaust valve 10a, the elastic forces of the valve spring 11a and the oil plug return spring 42 need to be overcome.
When the cylinder a enters the compression stroke, the intake/exhaust valve is closed, the compressed gas in the cylinder a generates reverse thrust to the piston to generate braking power, and before the piston approaches the top dead center, the valve rocker 12B of the intake mechanism of the cylinder B starts to move under the action of the cam shaft (not shown in the figure), the plunger 72 of the oil pumping device 70 is pushed to move upward (as shown in fig. 4), the engine oil in the oil cavity is compressed and transferred to the oil cavity of the oil cylinder device 40, the oil plug 43 of the oil cylinder device 40 is pushed to move downward, and the exhaust valve 10a of the cylinder a is opened.
After the plunger 72 of the oil pumping device 70 continues to move up to the set stroke, the oil chamber is communicated with the oil pan 60 through the plunger oil hole 721, the annular oil groove 722 and the plunger sleeve oil return hole 712 in the plunger 72 and the pressure limiting valve 75 in the oil pump oil return path, the oil pressure in the plunger oil chamber 74 is relieved, the plunger 72 continues to move up, and the engine oil in the plunger oil chamber 74 is not pressurized. The oil cylinder device 40 and the oil plug 43 move upward under the combined action of the oil plug return spring 42 and the valve spring 11a of the cylinder a, the exhaust valve 10a of the cylinder a is closed, and the release of pressure is completed.
After a certain crank angle, the intake valve 10B of the cylinder B is closed, the valve rocker 12B is reset, and the plunger 72 of the oil pumping device 70 returns to the position of fig. 2 or 3 under the action of the plunger return spring 73, thereby completing one working cycle.
Based on the same principle, the air inlet mechanism of the 1 cylinder and the air outlet mechanism of the 6 cylinder, the air outlet mechanism of the 2 cylinder and the air inlet mechanism of the 5 cylinder, the air inlet mechanism of the 2 cylinder and the air outlet mechanism of the 5 cylinder, the air outlet mechanism of the 3 cylinder and the air inlet mechanism of the 4 cylinder, and the air inlet mechanism of the 3 cylinder and the air outlet mechanism of the 4 cylinder can also form a braking device, which is not described herein. In such a configuration, as shown in fig. 6, the intake mechanism of each cylinder is provided with one of the oil pumping devices, the exhaust mechanism of each cylinder is provided with one of the oil cylinder devices, the cylinder body oil hole of each cylinder device is communicated with the engine oil path of the engine through one of the main oil paths, the main oil paths share the same one of the on-off solenoid valves 30, and each of the main oil paths has one of the check valves 20. The inventive concept can also be generalized to multi-cylinder four-stroke engines with an even number of cylinders, which may comprise several pairs of cylinders, as long as the two cylinders of each pair have a phase difference of 360 crank angle.
The invention discloses an exhaust braking scheme of a camshaft lower structure, which can be realized by referring to an engine with a camshaft upper structure.
The present invention is not limited to the above embodiments, and all modifications based on the concept, principle, structure and method of the present invention are included in the scope of the present invention.
Claims (9)
1. An in-cylinder compression release engine brake apparatus comprising:
the engine is a multi-cylinder four-stroke engine with even number of cylinders, the engine comprises a plurality of pairs of cylinders, two cylinders in each pair of cylinders are respectively marked as a cylinder A and a cylinder B, and the phase difference of the two cylinders is 360 DEG crank angle; characterized in that the braking device further comprises
The oil cylinder device drives a valve rocker of an exhaust mechanism of the cylinder A to swing so as to open an exhaust valve;
The oil cylinder device comprises a cylinder body, a first cylinder cover, a second cylinder cover, an oil plug rod and a return spring; the first cylinder cover and the second cylinder cover are respectively arranged at two ends of the cylinder body, the oil plug is arranged in the cylinder body, the oil plug rod is fixed on the oil plug, and the oil plug rod extends out of the first cylinder cover and abuts against the upper end face of the valve rocker; in the cylinder body, a cavity which is positioned between the oil plug and the first cylinder cover and penetrated by the oil plug rod is marked as a rod cavity, a cavity which is positioned between the oil plug and the second cylinder cover is marked as a rodless cavity, and the return spring is sleeved on the oil plug rod and arranged in the rod cavity; the second cylinder cover is provided with a cylinder oil hole, the cylinder oil hole is communicated with the rodless cavity, the cylinder oil hole is communicated with an engine oil path of the engine through a main oil path, the cylinder oil hole is communicated with an oil pan of the engine through an oil cylinder return oil path, the main oil path is provided with an on-off electromagnetic valve and a one-way valve, and the oil cylinder return oil path is provided with a throttling device;
the oil pumping device is controlled by an air inlet mechanism of the cylinder B to pump engine oil of an engine into the oil cylinder device so as to drive a valve rocker of an exhaust mechanism of the cylinder A to swing;
The oil pumping device comprises a plunger sleeve, a plunger and a plunger return spring, wherein the plunger sleeve and the plunger are coupled parts, the plunger sleeve is provided with a first end part and a second end part, the plunger extends out of the first end part, the plunger return spring is sleeved on the plunger and is clamped between the first end part and the plunger, a cavity in the plunger sleeve between the second end part and the plunger is a plunger oil cavity, the plunger is provided with a plunger oil hole, the peripheral surface of the plunger is provided with an annular oil groove, and the plunger oil hole is communicated with the annular oil groove and the plunger oil cavity; the second end part is provided with a plunger sleeve oil pumping hole which is communicated with the main oil way, the plunger sleeve oil pumping hole is communicated with the cylinder oil hole, the side wall of the plunger sleeve is provided with a plunger sleeve oil return hole, an oil pump oil return way is arranged between the plunger sleeve oil return hole and the oil pan, and the oil pump oil return way is provided with a pressure limiting valve;
The plunger rod is propped against the exhaust valve side of the valve rocker of the cylinder A exhaust mechanism, and when the switching electromagnetic valve communicates the main oil way with the engine oil way, the plunger rod is propped against the opposite side of the intake valve of the valve rocker of the cylinder B intake mechanism;
The oil plug rod is a stepped shaft, the first end cover is provided with a stepped hole matched with the stepped shaft, and when the oil plug is propped against the end face of the rodless cavity, an axial gap is arranged between the shaft shoulder of the stepped shaft and the hole shoulder of the stepped hole.
2. The compression-release type engine in-cylinder brake apparatus as defined in claim 1, wherein said second cylinder head is provided with an oil collecting chamber, said oil collecting chamber being communicated with said rodless chamber and said cylinder block oil hole, respectively.
3. The compression-release type engine in-cylinder brake apparatus as defined in claim 1, wherein said second cylinder head is integrally provided with said cylinder block.
4. The compression-release type engine in-cylinder brake apparatus as defined in claim 1, wherein said oil plug rod is integrally provided with said oil plug.
5. The compression-release type in-cylinder brake apparatus as defined in claim 1, wherein said throttle means is a throttle valve.
6. The compression-release type engine in-cylinder brake apparatus as defined in claim 1, wherein said on-off solenoid valve is a two-position two-way normally-closed on-off solenoid valve.
7. The compression-release engine in-cylinder brake apparatus as defined in claim 1, wherein said first end portion of said plunger sleeve is detachably connected to said plunger sleeve, said second end portion is integrally provided with said plunger sleeve, or said second end portion of said plunger sleeve is detachably connected to said plunger sleeve, said first end portion is integrally provided with said plunger sleeve.
8. The compression-release type engine in-cylinder brake apparatus according to claim 1, wherein said oil pumping means is provided to said intake mechanism of said cylinder a, said oil cylinder means is provided to said exhaust mechanism of said cylinder B, and cylinder body oil holes of each of said oil cylinder means are communicated with an engine oil passage of said engine through one of said main oil passages, and these main oil passages share the same on-off electromagnetic valve.
9. The compression-release type engine in-cylinder brake apparatus as defined in claim 1, wherein said oil pumping means is provided for an intake mechanism of each cylinder, said oil cylinder means is provided for an exhaust mechanism of each cylinder, and cylinder body oil holes of each of said oil cylinder means are communicated with an engine oil passage of said engine through one of said main oil passages, and these main oil passages share the same one of said switching solenoid valves.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910996869.9A CN110566309B (en) | 2019-10-19 | 2019-10-19 | Compression release type engine in-cylinder braking device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910996869.9A CN110566309B (en) | 2019-10-19 | 2019-10-19 | Compression release type engine in-cylinder braking device |
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| CN110566309A CN110566309A (en) | 2019-12-13 |
| CN110566309B true CN110566309B (en) | 2024-07-05 |
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| CN201910996869.9A Active CN110566309B (en) | 2019-10-19 | 2019-10-19 | Compression release type engine in-cylinder braking device |
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| CN111058916B (en) * | 2019-12-28 | 2024-05-07 | 潍坊力创电子科技有限公司 | Compression release type in-cylinder braking system of engine |
| CN111894697A (en) * | 2020-09-01 | 2020-11-06 | 大连理工大学 | High-efficient multistage arrestment mechanism |
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