CN110566309A - Compression release type in-cylinder brake device for engine - Google Patents
Compression release type in-cylinder brake device for engine Download PDFInfo
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- CN110566309A CN110566309A CN201910996869.9A CN201910996869A CN110566309A CN 110566309 A CN110566309 A CN 110566309A CN 201910996869 A CN201910996869 A CN 201910996869A CN 110566309 A CN110566309 A CN 110566309A
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- 230000006835 compression Effects 0.000 title claims abstract description 30
- 238000007906 compression Methods 0.000 title claims abstract description 30
- 239000003921 oil Substances 0.000 claims abstract description 246
- 230000007246 mechanism Effects 0.000 claims abstract description 48
- 238000005086 pumping Methods 0.000 claims abstract description 26
- 239000010705 motor oil Substances 0.000 claims abstract description 14
- 239000010727 cylinder oil Substances 0.000 claims description 8
- 230000002093 peripheral effect Effects 0.000 claims description 3
- 230000008878 coupling Effects 0.000 claims description 2
- 238000010168 coupling process Methods 0.000 claims description 2
- 238000005859 coupling reaction Methods 0.000 claims description 2
- 230000009471 action Effects 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 230000001174 ascending effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000002485 combustion reaction Methods 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
Abstract
The invention discloses a compression release type engine in-cylinder braking device, wherein in a pair of cylinders with the phase difference of 360-degree crank angle, 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 to drive a valve rocker of the exhaust mechanism of the cylinder A to swing, and thus an exhaust valve of the exhaust mechanism of the cylinder A is jacked open to realize release braking. The device can realize the switching between braking and non-braking only by controlling the on and off of the switch electromagnetic valve, has low requirement on a control circuit, stable and reliable work and low failure rate, and is particularly suitable for a multi-cylinder four-stroke engine 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-release braking, compression release braking and the like, wherein the compression release braking technology is the best technology of the braking performance of the engine at present, and the basic principle is as follows: when the engine is dragged backwards, the piston compresses the gas in the cylinder to generate braking power in the process of ascending the compression stroke piston. Before the compression top dead center, the compression release type brake device drives the exhaust valve to open a certain opening degree, compressed high-temperature and high-pressure charging in the cylinder is discharged, at the moment, the pressure in the cylinder is rapidly reduced, after a certain crank angle, the exhaust valve is closed again, the piston moves downwards, and as the charging in the cylinder is greatly reduced, the working of the charging in the cylinder on the piston is also greatly reduced, and the counter braking power of the compression charging in the cylinder on the piston is reduced or eliminated.
Compression release braking technology, generally combined with exhaust butterfly valve braking, during the exhaust stroke, the exhaust passage of the engine is closed by the butterfly valve, back pressure is established, and the piston is subjected to the pressure of gas during the upward process, so that the upward speed is reduced, the power loss of the piston is increased, and the braking power is generated again.
Chinese utility model patent CN201241740Y discloses a four-stroke internal combustion engine rocking arm integrated form arresting gear, it sets up two braking archs on the control cam for realize opening the (air) intake valve before the intake stroke finishes and increase the air input, open the cylinder braking that the exhaust valve released pressure realized the engine before the compression stroke finishes, in order to offset the valve lift that the arch arouses of braking when the engine normal operating, need set up hydraulic control's clearance compensation mechanism on the rocking arm. Because the normal operating state accounts for the vast majority of the operating state of the whole engine, the clearance compensation mechanism is in the working state in the vast majority of the operating time of the engine, higher requirements on reliability and the like are provided, and the structure is more complex.
Disclosure of Invention
In view of the above-mentioned shortcomings of the prior art, the present invention provides a compression-release in-cylinder brake device for an engine to improve the operational reliability and reduce the failure rate.
In order to solve the above technical problem, the present invention provides a compression release type in-cylinder brake apparatus for an engine, comprising: the engine is a multi-cylinder four-stroke engine with an even number of cylinders, and comprises a plurality of pairs of cylinders, wherein two cylinders in each pair of cylinders are respectively marked as a cylinder A and a cylinder B, and the phase difference between the two cylinders is 360-degree crank angle; the oil cylinder device drives a valve rocker of an exhaust mechanism of the air 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 installed at two ends of the cylinder body, the oil plug is arranged in the cylinder body, the oil plug rod is fixed to 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 is 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 is arranged in the rod cavity; the second cylinder cover is provided with a cylinder body oil hole, the cylinder body oil hole is communicated with the rodless cavity, the cylinder body oil hole is communicated with an engine oil path of the engine through a main oil path, the cylinder body oil hole is communicated with an oil pan of the engine through an oil cylinder oil return path, the main oil path is provided with a switch electromagnetic valve and a one-way valve, and the oil cylinder oil return 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 the engine into the oil cylinder device so as to drive a valve rocker arm 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 coupling 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 clamped between the first end part and the plunger, a cavity between the second end part and the plunger in the plunger sleeve is a plunger oil cavity, the plunger is provided with a plunger oil hole and an annular oil groove on the peripheral surface, and the plunger oil hole is communicated with the annular oil groove and the plunger oil cavity; the oil pump comprises a cylinder body oil hole, a plunger sleeve oil return hole, an oil pump oil return path and a pressure limiting valve, wherein the plunger sleeve oil hole is formed in the second end portion, the plunger sleeve oil hole is communicated with the main oil path, the plunger sleeve oil 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, the oil pump oil return path is arranged between the plunger sleeve oil return hole and the oil pan, and the oil.
the oil plug rod is abutted against the exhaust valve side of a valve rocker of the exhaust mechanism of the cylinder A, and when the switch electromagnetic valve communicates the main oil way with the engine oil way, the plunger is abutted against the opposite side of the inlet valve of the valve rocker of the intake mechanism of the cylinder B.
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 abuts against the end face of the rodless cavity, an axial gap is formed between a shaft shoulder of the stepped shaft and a hole shoulder of the stepped hole.
The second cylinder cover is provided with an oil collecting cavity, and the oil collecting cavity is communicated with the rodless cavity and the oil hole of the cylinder body respectively.
Wherein the second cylinder head is integrated with the cylinder body.
wherein, the oil plug rod and the oil plug are integrated.
Wherein the throttling device is a throttle valve.
the switching electromagnetic valve is a two-position two-way normally closed switching electromagnetic valve.
The first end part of the plunger sleeve is detachably connected with the plunger sleeve, the second end part of the plunger sleeve is integrated with the plunger sleeve, or the second end part of the plunger sleeve is detachably connected with the plunger sleeve, and the first end part of the plunger sleeve is integrated with the plunger sleeve.
the oil pumping device is arranged in the air inlet mechanism of the air cylinder A, the oil cylinder device is arranged in the air exhaust mechanism of the air cylinder B, 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 oil pumping device is arranged on the air inlet mechanism of each air cylinder, the oil cylinder device is arranged on the air outlet mechanism of each air cylinder, the cylinder body oil hole of each air cylinder device is communicated with the oil circuit of the engine through one main oil circuit, and the main oil circuits share the same switch electromagnetic valve.
After the technical scheme is adopted, the invention has the technical effects that in a pair of cylinders with the phase difference of 360-degree crank angle, the exhaust mechanism of one cylinder A is provided with the oil cylinder device, the air inlet mechanism of the other cylinder B is provided with the 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 to drive the valve rocker arm 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 open to realize release braking. The device can realize the brake/non-brake conversion of all cylinders of the whole engine only by controlling the on/off of one switching electromagnetic valve, has low requirement on a control circuit, works stably and reliably and has low failure rate, and is particularly suitable for a multi-cylinder four-stroke engine with even number of cylinders.
Drawings
FIG. 1 is a schematic view of a compression-release in-cylinder brake apparatus according to an embodiment of the present invention for controlling a pair of cylinders of a six-cylinder four-stroke engine in a normal operation mode;
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 operation state in which the oil pumping device in the embodiment shown in FIG. 1 is subjected to only oil pressure when the on-off solenoid valve is opened;
FIG. 4 is a reference diagram showing an operating state in which the oil pumping device in the embodiment shown in FIG. 1 pumps oil toward the cylinder device after the on-off solenoid valve is opened, pushed by the valve rocker of the intake mechanism of the cylinder B;
Fig. 5 is a reference view showing an operation state of the oil pumping device in the embodiment shown in fig. 1 after the switching solenoid valve is closed;
FIG. 6 is a schematic diagram of the operation of an embodiment of the compression-release 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, 13 a-rocker shaft, 14 a-push rod, 10 b-intake valve, 11 b-valve spring, 12 b-valve rocker, 13 b-rocker shaft, 14 b-push rod, 20-one-way valve, 30-switching solenoid valve, 40-oil cylinder device, 41-cylinder body, 42-oil plug return spring, 43-oil plug, 44-oil collecting cavity, 45-first cylinder cover, 46-oil plug rod, 47-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 chamber, 75-pressure limiting valve, H-axial clearance.
Detailed Description
The invention is further illustrated with reference to the following figures and examples.
The working sequence of the six-cylinder four-stroke engine is 1-5-3-6-2-4, namely the phase difference between the 1 st cylinder and the 6 th cylinder is 360 degrees of crankshaft rotation angle, the phase difference between the 2 nd cylinder and the 5 th cylinder is 360 degrees of crankshaft rotation angle, and the phase difference between the 3 rd cylinder and the 4 th cylinder is 360 degrees of crankshaft rotation angle. For simplicity, cylinder 1 will be referred to as cylinder 1, cylinder 2 will be referred to as cylinder 2, and so on.
Taking 1 cylinder and 6 cylinders as an example, when the 1 cylinder piston is close to the compression top dead center, the 6 cylinder piston is close to the intake/exhaust top dead center, at this time, the intake/exhaust valve of the 1 cylinder is closed, the intake valve of the 6 cylinder is opened, and the exhaust valve is closed.
As shown in fig. 1 and 2, in a compression-release type engine in-cylinder brake device, for convenience of description, 1 cylinder is denoted as a cylinder a, and 6 cylinders are denoted as a cylinder B. The oil pumping device 70 is controlled by the air intake mechanism of the cylinder B, and pumps engine oil into the oil cylinder device 40 to drive the valve rocker arm of the exhaust mechanism of the cylinder a to swing, so as to jack the exhaust valve 10a of the exhaust mechanism of the cylinder a to release braking.
A valve rocker arm 12a of an exhaust mechanism of the cylinder A is rotatably arranged on a rocker shaft 13a, a push rod 14a and an exhaust valve 10a are respectively arranged on two sides of the rocker shaft 13a, when the push rod 14a pushes the valve rocker arm 12a to swing around the rocker shaft 13a from one side under the action of a camshaft (not shown), the other side of the valve rocker arm 12a presses the exhaust valve 10a, and the valve is opened; when the camshaft rotates by a specified angle, the exhaust valve 10a is returned by the valve spring 11a, and the valve is closed.
Similarly, a valve rocker arm 12B of an air inlet mechanism of the cylinder B is rotatably arranged on a rocker shaft 13B, a push rod 14B and an air inlet valve 11B are respectively arranged at two sides of the rocker shaft 13B, when the push rod 14B pushes the valve rocker arm 12B from one side to swing around the rocker shaft 13B under the action of a cam shaft (not shown), the other side of the valve rocker arm 12B presses the air inlet valve 10B, and the valve is opened; when the camshaft rotates by a predetermined angle, the intake valve 10b is returned by the valve spring 11b, and the valve is closed.
the oil cylinder device 40 includes a cylinder body 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 cover 45 and the second cylinder cover are respectively installed at two ends of the cylinder body 41 (in this embodiment, the second cylinder cover and the cylinder body 41 are integrally arranged, and may also be of a split structure), the oil plug 43 is arranged in the cylinder body 41, the oil plug rod 46 is fixed to the oil plug 43 (in this embodiment, the oil plug rod 46 and the oil plug 43 are integrally arranged, and may also be of a split structure), the oil plug rod 46 extends from the first cylinder cover 45 and abuts against an upper end face of the valve rocker 12a, and the upper end face is located on an exhaust valve side of an exhaust rocker of the cylinder a exhaust mechanism.
In the cylinder body 41, a cavity which is located between the oil plug 43 and the first cylinder cover 45 and is penetrated by the oil plug rod 46 is marked as a rod cavity, a cavity which is located between the oil plug 43 and the second cylinder cover is marked as a rod-free cavity, and the return spring 42 is sleeved on the oil plug rod 46 and is arranged in the rod cavity.
The second cylinder head is provided with a cylinder body oil hole 47, the cylinder body oil hole 47 is communicated with the rodless cavity, the cylinder body oil hole 47 is communicated with an engine oil path through a main oil path, the cylinder body oil hole 47 is communicated with an oil pan 60 of the engine through an oil cylinder oil return path, the main oil path is provided with a switching electromagnetic valve 30 and a one-way valve 20 (in the embodiment, the switching electromagnetic valve 30 is a two-position two-way normally-closed switching electromagnetic valve), and the oil cylinder oil return path is provided with a throttling device (in the embodiment, the throttling device is a throttling valve 50, and can also be of a throttling hole structure and.
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 oil hole 47. The purpose of the oil collection chamber 44 is to facilitate the placement of the cylinder bore 47 and to prevent the oil plug 43 from closing the cylinder bore 47 when it is at the end of the cylinder 41.
In the invention, the oil plug rod 46 is a stepped shaft, the first end cover 45 is provided with a stepped hole matched with the stepped shaft, when the oil plug 43 abuts against the end face of the rodless cavity, an axial gap H is arranged between a shaft shoulder of the stepped shaft and a hole shoulder of the stepped hole, and the axial gap H is the stroke of the oil plug 43.
as shown in fig. 3 to 5, the oil pumping device 70 includes a plunger sleeve 71, a plunger 72, and a plunger return spring 73, the plunger sleeve 71 and the plunger 72 are a coupler, the plunger sleeve 71 has a first end portion and a second end portion, the plunger 72 extends from the first end portion, the plunger return spring 73 is sleeved on the plunger 72 and is clamped between the first end portion and the plunger 72, a cavity between the second end portion and the plunger 72 in the plunger sleeve 71 is a plunger oil chamber 74, the plunger 72 is provided with a plunger oil hole 721 and an annular oil groove 722 on the peripheral surface, and the plunger oil hole communicates the annular oil groove 722 and the plunger oil chamber 74. The second end portion 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, a plunger sleeve oil return hole 712 is formed in the side wall of the plunger sleeve 71, 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 side opposite to the intake valve 10B of the intake rocker arm of the intake mechanism of the cylinder B.
In the present invention, the first end portion of the plunger sleeve 71 is detachably connected to the plunger sleeve 71, and the second end portion is integrated with the plunger sleeve 71. The second end portion of plunger sleeve 71 may be detachably connected to plunger sleeve 71, and the first end portion may be integrated with 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 top end by the oil plug return spring 42, and the plunger 72 of the oil pumping device 70 is stopped at the top end by the plunger return spring 73.
as shown in fig. 2 and 3, when the engine enters the in-cylinder braking mode, the switching solenoid valve 30 is turned on, engine oil enters the oil chambers of the oil cylinder device 40 and the oil pumping device 70 through the main oil path, the lower end of the plunger 72 of the oil pumping device 70 is pushed to abut against the upper end surface 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 a compression stroke, the intake/exhaust valve is closed, compressed gas in the cylinder A generates reverse thrust on a piston to generate braking power, before the piston of the cylinder A approaches a top dead center, a valve rocker arm 12B of an intake mechanism of the cylinder B starts to move under the action of a camshaft (not shown in the figure), a plunger 72 of an oil pumping device 70 is pushed to move upwards (shown in figure 4), oil in an oil cavity is compressed and transmitted to an oil cavity of the oil cylinder device 40, an oil plug 43 of the oil cylinder device 40 is pushed to move downwards, and an exhaust valve 10a of the cylinder A is opened.
After the plunger 72 of the oil pumping device 70 continues to move upwards to the set stroke, the oil cavity 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 return oil path of the oil pump, the oil pressure in the plunger oil cavity 74 is relieved, the plunger 72 continues to move upwards, and the engine oil in the plunger oil cavity 74 is not pressurized. The oil plug 43 of the cylinder device 40 moves upwards 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 pressure release is finished.
After a certain crank angle, the intake valve 10B of the cylinder B is closed, the rocker arm 12B is reset, and the plunger 72 of the oil pumping device 70 returns to the position shown in fig. 2 or 3 under the action of the plunger return spring 73, thereby completing a working cycle.
Based on the same principle, the air intake mechanism of 1 cylinder and the exhaust mechanism of 6 cylinders, the air exhaust mechanism of 2 cylinders and the air intake mechanism of 5 cylinders, the air intake mechanism of 2 cylinders and the exhaust mechanism of 5 cylinders, the exhaust mechanism of 3 cylinders and the air intake mechanism of 4 cylinders, and the air intake mechanism of 3 cylinders and the exhaust mechanism of 4 cylinders can also form a braking device, which is not described herein again. In such a configuration, as shown in fig. 6, the oil pumping device is provided for each of the intake mechanisms of the cylinders, the oil cylinder device is provided for each of the exhaust mechanisms of the cylinders, and the block oil hole of each of the cylinder devices is communicated with the oil passage of the engine through one of the main oil passages, which share the same switching solenoid valve 30, and one check valve 20 is provided in each of the main oil passages. The concept of the invention can also be extended to multi-cylinder four-stroke engines with an even number of cylinders, which may comprise several pairs of cylinders, as long as the phase difference of the two cylinders in each pair is 360 crank angle degrees.
The invention discloses an exhaust braking scheme of a camshaft underlying structure, which can be realized by referring to an engine with a camshaft overlying structure.
The present invention is not limited to the embodiments described above, and all modifications that can be made based on the concept, principle, structure and method of the present invention will fall within the scope of the present invention.
Claims (11)
1. A compression-release in-cylinder brake apparatus for an engine, comprising:
the engine is a multi-cylinder four-stroke engine with an even number of cylinders, and comprises a plurality of pairs of cylinders, wherein two cylinders in each pair of cylinders are respectively marked as a cylinder A and a cylinder B, and the phase difference between the two cylinders is 360-degree crank angle; characterized in that the braking device also comprises
The oil cylinder device drives a valve rocker of an exhaust mechanism of the air 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 installed at two ends of the cylinder body, the oil plug is arranged in the cylinder body, the oil plug rod is fixed to 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 is 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 is arranged in the rod cavity; the second cylinder cover is provided with a cylinder body oil hole, the cylinder body oil hole is communicated with the rodless cavity, the cylinder body oil hole is communicated with an engine oil path of the engine through a main oil path, the cylinder body oil hole is communicated with an oil pan of the engine through an oil cylinder oil return path, the main oil path is provided with a switch electromagnetic valve and a one-way valve, and the oil cylinder oil return 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 the engine into the oil cylinder device so as to drive a valve rocker arm 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 coupling 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 clamped between the first end part and the plunger, a cavity between the second end part and the plunger in the plunger sleeve is a plunger oil cavity, the plunger is provided with a plunger oil hole and an annular oil groove on the peripheral surface, and the plunger oil hole is communicated with the annular oil groove and the plunger oil cavity; the oil pump comprises a cylinder body oil hole, a plunger sleeve oil return hole, an oil pump oil return path and a pressure limiting valve, wherein the plunger sleeve oil hole is formed in the second end portion, the plunger sleeve oil hole is communicated with the main oil path, the plunger sleeve oil 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, the oil pump oil return path is arranged between the plunger sleeve oil return hole and the oil pan, and the oil.
2. The compression-release engine in-cylinder brake apparatus according to claim 1, wherein the plug rod abuts against an exhaust valve side of a rocker arm of the cylinder a exhaust mechanism, and the plunger abuts against an intake valve side of a rocker arm of the cylinder B intake mechanism when the on-off solenoid valve communicates the main oil passage with the engine oil passage.
3. The compression-release engine in-cylinder brake apparatus as defined in claim 1, wherein said oil plug rod is a stepped shaft, said first end cap is provided with a stepped hole adapted to said stepped shaft, and when said oil plug abuts against an end surface of the rodless chamber, an axial gap is provided between a shoulder of said stepped shaft and a shoulder of said stepped hole.
4. The compression-release engine in-cylinder brake apparatus according to claim 1, wherein the second head is formed with an oil collection chamber, and the oil collection chamber communicates with the rodless chamber and the cylinder block oil hole, respectively.
5. The compression-release engine in-cylinder brake apparatus as defined in claim 1, wherein said second cylinder head is integral with said cylinder block.
6. The compression-release engine in-cylinder brake apparatus as defined in claim 1, wherein said oil plug rod is provided integrally with said oil plug.
7. The compression-release engine in-cylinder brake apparatus as defined in claim 1, wherein said throttle means is a throttle valve.
8. The compression-release engine in-cylinder brake apparatus as defined in claim 1, wherein the on-off solenoid valve is a two-position, two-way, normally closed on-off solenoid valve.
9. The compression-release engine in-cylinder brake apparatus as defined in claim 1, wherein a first end of the plunger sleeve is removably coupled to the plunger sleeve and the second end is integral with the plunger sleeve, or a second end of the plunger sleeve is removably coupled to the plunger sleeve and the first end is integral with the plunger sleeve.
10. The in-cylinder brake apparatus for compression-release engine according to claim 1, wherein said oil pumping means is provided for said intake means of cylinder a, said oil cylinder means is provided for said exhaust means of cylinder B, and said block oil hole of each of said cylinder means is communicated with said oil passage of said engine through one of said main oil passages, said main oil passages sharing the same said switching solenoid valve.
11. The compression-release engine in-cylinder brake apparatus according to claim 1, wherein said oil pumping means is provided for each of said air intake means of said cylinder, said oil cylinder means is provided for each of said air exhaust means of said cylinder, and said block oil hole of each of said cylinder means is communicated with said oil passage of said engine through one of said main oil passages, said main oil passages sharing one and the same said on-off solenoid valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910996869.9A CN110566309A (en) | 2019-10-19 | 2019-10-19 | Compression release type in-cylinder brake device for engine |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910996869.9A CN110566309A (en) | 2019-10-19 | 2019-10-19 | Compression release type in-cylinder brake device for engine |
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| CN110566309A true CN110566309A (en) | 2019-12-13 |
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| CN201910996869.9A Pending CN110566309A (en) | 2019-10-19 | 2019-10-19 | Compression release type in-cylinder brake device for engine |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111058916A (en) * | 2019-12-28 | 2020-04-24 | 潍坊力创电子科技有限公司 | Compression release in-cylinder brake system for engine |
| WO2022048072A1 (en) * | 2020-09-01 | 2022-03-10 | 大连理工大学 | High-efficiency multi-stage brake mechanism |
-
2019
- 2019-10-19 CN CN201910996869.9A patent/CN110566309A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111058916A (en) * | 2019-12-28 | 2020-04-24 | 潍坊力创电子科技有限公司 | Compression release in-cylinder brake system for engine |
| WO2022048072A1 (en) * | 2020-09-01 | 2022-03-10 | 大连理工大学 | High-efficiency multi-stage brake mechanism |
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