CN101713373B - Four-stroke hydraulic free piston engine with variable stroke - Google Patents
Four-stroke hydraulic free piston engine with variable stroke Download PDFInfo
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- CN101713373B CN101713373B CN200910154977A CN200910154977A CN101713373B CN 101713373 B CN101713373 B CN 101713373B CN 200910154977 A CN200910154977 A CN 200910154977A CN 200910154977 A CN200910154977 A CN 200910154977A CN 101713373 B CN101713373 B CN 101713373B
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Abstract
The invention discloses a four-stroke hydraulic free piston engine with a variable stroke, mainly comprising a free piston assembly, a hydraulic cylinder body and a two-cylinder in-line cylinder block. The two-cylinder in-line cylinder block is a two-cylinder four-stroke motor cylinder block; the free piston assembly comprises a first power piston, a second power piston, a hydraulic pump piston, a compression piston and a piston rod, wherein the hydraulic pump piston and the compression piston are placed in the hydraulic cylinder body and are respectively and fixedly connected with the piston rod; the first power piston and the second power piston are respectively placed in two cylinders of the two-cylinder in-line cylinder block, and the end surfaces of the first power piston and the second power piston are located at the same vertical surface, and the first power piston and the second power piston are in screwed connection with the piston rod by a connecting rod. In the invention, each cylinder has a separate exhaust and suction stroke, the waste gas is completely eliminated, and the aeration efficiency is high; the screwed connection between the piston rod and the piston assembly of the four-stroke cylinder body can change the operation frequency and the output power of the engine.
Description
Technical field
The present invention relates to reciprocating engine, especially relate to a kind of four-stroke hydraulic free-piston engine of stroke changeable.
Background technique
Global energy is on the verge of exhaustion at present, and increasingly high for energy-conservation cry, hydraulic free-piston engine arises at the historic moment under this overall background; Hydraulic free-piston engine is not only the star of running mechanism power likely; And because subjects such as it and internal-combustion engine technology, hydraulics, microelectronic technology, control technique are closely related; System's each several part is proposed very high requirement, also is the strong impetus that promotes the modern hydraulic technology development.
Traditional hydraulic free-piston engine, no matter be single piston type, double piston type or opposed piston, its power section all is the two stroke IC engine that adopts, promptly a working procedure includes only scavenging and compression stroke, two strokes such as expansion and scavenging stroke.With respect to quartastroke engine, the topmost advantage of two stroke IC engine is under same structure, to have higher efficient; But because its breathing process and exhaust process degree of overlapping are very big, waste gas is discharged not exclusively, and volumetric efficiency is low, the incomplete combustion of fuel, and pollutant emission exceeds standard.Except in some special applications, like fishing boat, large ship etc. also have outside the application, and almost difficulty is seen its trace on market.Especially in recent years for the raising day by day of environmental requirement, the application area of two stroke IC engine is dwindled gradually.And the two stroke IC engine oil inflame is incomplete, and oil consumption is bigger, and under the prerequisite that oil price raises year by year at present, continuing to adopt two stroke IC engine also is that a kind of non-reason is selected.
Summary of the invention
The object of the present invention is to provide a kind of four-stroke hydraulic free-piston engine of stroke changeable, the air-breathing coefficient height of this motor, sufficient combustion, disposal of pollutants are low, can reduce fuel consumption rate and dustiness.
The technological scheme that the present invention solves its technical problem employing is: the four-stroke hydraulic free-piston engine of this stroke changeable mainly comprises free piston assembly, hydraulic cylinder and two cylinder cylinder in line bodies; Said two cylinder cylinder in line bodies are two cylinder four-stroke cylinder block, and said free piston assembly comprises first power piston, second power piston, oil hydraulic pump piston, compression piston and piston rod; Said oil hydraulic pump piston and compression piston place in the hydraulic cylinder, and oil hydraulic pump piston and compression piston are fixedly connected with piston rod respectively; First power piston and second power piston correspondingly place two cylinder block of two cylinder cylinder in line bodies end face interior and first power piston and second power piston to be in same vertical plane respectively; First power piston and second power piston connect with piston rod thread through connecting rod, and the tip to face distance that changes first power piston and second power piston through the position of adjusting connecting rod and the piston rod distance of the cylinder head of cylinder block separately.
Compare with background technique; The beneficial effect that the present invention has is: because the cylinder block of this hydraulic free-piston engine partly adopts the four-stroke structure; Have independent exhaust stroke and suction stroke, so air-breathing coefficient height, sufficient combustion, the disposal of pollutants of motor are low, can reduce fuel consumption rate and dustiness; Can satisfy at present for environmental protection and energy-conservation double requirements, can be used in engineering machinery, the urban transportation vehicle as drive unit; In addition; Adopt between the piston rod of four-stroke cylinder block and the piston assembly and be threaded; Adjust the distance of burning piston and burning cavity cylinder head through the length of adjustment piston assembly precession; Can change the stroke of free-piston engine operation, expand the operation frequency scope and the output power range of motor.
Description of drawings
Fig. 1 is the compression and the exhaust stroke working principle schematic representation of motor of the present invention.
Fig. 2 is the expansion and the suction stroke working principle schematic representation of motor of the present invention.
Fig. 3 is that piston of engine stroke of the present invention piston assembly when maximum connects schematic representation (part).
Fig. 4 is that piston of engine stroke of the present invention piston assembly hour connects schematic representation (part).
Among the figure: 1. first oil sprayer, 1 '. second oil sprayer, 2. first suction valve, 2 '. second suction valve, 3. first burning cavity, 3 '. second burning cavity; 4. first power piston, 4 '. second power piston, 5. first cylinder block, 5 '. second cylinder block, 6. an oil hydraulic pump left side chamber, 7. oil hydraulic pump piston; 8. the right chamber of oil hydraulic pump, 9. high pressure accumulator, 10. pump oil one-way valve, 11. compression pistons, 12. compression chambers, 13. one-way valves; 14. the compress energy storage device, 15. the 1 selector valves, 16. the 2 2/2 selector valves, 17. relief valves, 18. one-way valves; 19. the 3 2/2 selector valve, 20. hydraulic cylinders, 21. low pressure accumulators, 22. the 4 2/2 selector valves, 23. oil feed non-return valve groups; 24. first outlet valve, 24 '. second outlet valve, 25. locking nuts, 26. connecting rods, 27. piston rods.
Embodiment
Below in conjunction with accompanying drawing and mode of execution the present invention is further described.
Like accompanying drawing 1, shown in Figure 2, the present invention includes free piston assembly, hydraulic cylinder 20 and two cylinder cylinder in line bodies.Two cylinder cylinder in line bodies are two cylinder four-stroke cylinder block; Wherein, The cylinder head of first cylinder block 5 be built-in with first suction valve 2, first outlet valve 24, first oil sprayer, 1, the second cylinder block 5 ' cylinder head be built-in with second suction valve 2 ', second outlet valve 24 ', second oil sprayer 1 '.Free piston assembly comprise first power piston 4, second power piston 4 ', oil hydraulic pump piston 7, compression piston 11 and piston rod 27; Oil hydraulic pump piston 7 places in the hydraulic cylinder 20 with compression piston 11, and oil hydraulic pump piston 7 is fixedly connected with piston rod 27 respectively with compression piston 11; First power piston 4 places in first cylinder block 5 of two cylinder cylinder in line bodies, second cylinder block 5 of second power piston 4 ' place, two cylinder cylinder in line bodies ' in; And first power piston 4 and second power piston 4 ' end face be in same vertical plane; Constantly the distance of the cylinder head of its tip to face distance cylinder block separately is identical in each of motion to guarantee two power pistons, promptly two power pistons arrive at one time first cylinder block 5 and second cylinder block 5 ' top dead center and lower dead center.First power piston 4 and second power piston 4 ' through connecting rod 26 and piston rod 27 scyewed joint; Position through adjustment locking nut 25, connecting rod 26 and piston rod 27; And then change first power piston 4 and second power piston, the 4 ' tip to face distance distance of cylinder block 5 and 5 ' cylinder head separately; Promptly can change the stroke of piston assembly operation, and the frequency of stroke change can change piston assembly operation and the power of output, the output power range and the operation frequency scope of expansion motor.
As depicted in figs. 1 and 2, during engine operation of the present invention, chamber 6, an oil hydraulic pump left side links to each other with high pressure accumulator 9 and load through pipeline; One side in the right chamber 8 of oil hydraulic pump links to each other with high pressure accumulator 9 through pump oil one-way valve 10, and opposite side links to each other with low pressure accumulator 21 through the shunt circuit of oil sucting one-way valve group 23 and the 4 2/2 selector valve 22; The right side of oil hydraulic pump piston 7 links to each other with compression piston 11 through piston rod 27; The right side of compression piston 11 is compression chambers 12; One side of compression chamber 12 links to each other with compress energy storage device 14 through the shunt circuit of one-way valve 13 and the one 2/2 selector valve 15, and opposite side links to each other with low pressure accumulator 21 through the shunt circuit of one-way valve 18 and the 3 2/2 selector valve 19; Shunt circuit through one the 2 2/2 selector valve 16 and relief valve 17 between compress energy storage device 14 and the low pressure accumulator 21 links to each other; Load is connected between low pressure accumulator 21 and the high pressure accumulator 9.
Like Fig. 3, shown in Figure 4; When the needs engine operational speed fast; But the time that output power is less can be adjusted to minimum position Lmin shown in Figure 3 with connecting rod, this moment first power piston 4 and second power piston 4 ' distance separately the top dead center of cylinder block apart from being Smin; Promptly the stroke of piston assembly is Smin at this moment, through the position of locking nut 25 stationary links 26; When the needs engine operational speed slow; When but output power is big; Can connecting rod 26 be adjusted to maximum position Lmax shown in Figure 4; This moment first power piston 4 and second power piston 4 ' distance the top dead center of cylinder block is apart from being Smax separately, promptly the stroke of piston assembly is Smax, passes through the position of locking nut 25 stationary links 26 then.
When the motor continous-stable is worked; A work cycle comprises two strokes, and is every through two work cycle, i.e. four strokes; Each cylinder of two cylinder cylinder in line bodies is all accomplished compression, expansion, exhaust and four strokes such as air-breathing, i.e. complete circulation.Because the working principle of two cylinders is just the same, therefore the work of motor is divided into the working procedure of compression and two strokes such as exhaust stroke, expansion and suction stroke, in the working procedure of these four strokes that repeat no more.
A) compression and exhaust stroke
As shown in Figure 1; When compression begins with exhaust stroke; Piston assembly lay respectively at first cylinder block 5 and second cylinder block 5 ' lower dead center, first suction valve 2 of two cylinder single-row cylinder arrangement body cylinder heads, second suction valve 2 ' and first outlet valve 24 all close and second outlet valve 24 ' open; Promptly this moment, what in first burning cavity 3, carry out was compression stroke, and second burning cavity 3 ' in what carry out is exhaust stroke.Under automatically controlled signal, the one 2/2 selector valve 15 is opened, and the high pressure oil in the compress energy storage device 14 enters into compression chamber 12 and promotes piston assembly to left movement; The right chamber 8 of oil hydraulic pump is through oil feed non-return valve group 23 oil suction from low pressure accumulator 21, and the hydraulic oil in the chamber 6, an oil hydraulic pump left side enters into high pressure accumulator 9 and load under the effect of oil hydraulic pump piston 7 simultaneously.Fresh air in first burning cavity 3 carries out adiabatic compression under the effect of first power piston 4.And second burning cavity 3 ' in waste gas through second outlet valve 24 ' discharge.Run to assigned position up to piston assembly, this moment, first oil sprayer 1 sprayed into atomized diesel fuel in first burning cavity 3.Compression stroke and exhaust stroke finish.
B) expansion acting and suction stroke
As shown in Figure 2; In expansion stroke; First suction valve 2, first outlet valve 24 and second outlet valve 24 of two cylinder single-row cylinder arrangement body cylinder heads ' all close; Second suction valve 2 ' open, what promptly carried out in first burning cavity 3 this moment is expansion stroke, and second burning cavity 3 ' in what carry out is suction stroke.When diesel oil is injected in first burning cavity 3 through first oil sprayer 1, diesel oil burns in first burning cavity 3, and the energy of release promotes piston assembly and moves right, and the expansion expansion stroke begins.Simultaneously second burning cavity 3 ' in because second power piston 4 ' move right, form partial vacuum, fresh air through second suction valve 2 ' entering second burning cavity 3 ' in, carry out suction stroke.The hydraulic oil in the right chamber 8 of oil hydraulic pump this moment enters into high pressure accumulator 9 through pump oil one-way valve 10 parts under the effect of oil hydraulic pump piston 7, another part enters into chamber 6, an oil hydraulic pump left side; Hydraulic oil in the compression chamber 12 flow back in the compress energy storage device 14 through one-way valve 13 under the effect of compression piston 11, for next compression stroke is prepared.Run to right stop up to piston assembly, expansion expansion stroke and suction stroke finish.
Through above-mentioned two processes, motor is accomplished a work cycle, and the oil hydraulic pump oil suction-pump oil once.Next work cycle and top two processes are similar, and just working cylinder changes second cylinder block into by first cylinder block, hockets successively.High pressure oil can be continuously externally exported in the reciprocal operation of motor.
Claims (1)
1. the four-stroke hydraulic free-piston engine of a stroke changeable; It is characterized in that: comprise free piston assembly, hydraulic cylinder (20) and two cylinder cylinder in line bodies; Said two cylinder cylinder in line bodies are two cylinder four-stroke cylinder block, and said free piston assembly comprises first power piston (4), second power piston (4'), oil hydraulic pump piston (7), compression piston (11) and piston rod (27); Said oil hydraulic pump piston (7) and compression piston (11) place in the hydraulic cylinder (20), and oil hydraulic pump piston (7) and compression piston (11) are fixedly connected with piston rod (27) respectively; First power piston (4) and second power piston (4') correspondingly place two cylinder block of two cylinder cylinder in line bodies end face interior and first power piston (4) and second power piston (4') to be in same vertical plane respectively; First power piston (4) and second power piston (4') be through connecting rod (26) and piston rod (27) scyewed joint, and the tip to face distance that changes first power piston (4) and second power piston (4') through the position of adjusting connecting rod (26) and piston rod (27) distance of the cylinder head of cylinder block separately.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910154977A CN101713373B (en) | 2009-12-07 | 2009-12-07 | Four-stroke hydraulic free piston engine with variable stroke |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910154977A CN101713373B (en) | 2009-12-07 | 2009-12-07 | Four-stroke hydraulic free piston engine with variable stroke |
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| Publication Number | Publication Date |
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| CN101713373A CN101713373A (en) | 2010-05-26 |
| CN101713373B true CN101713373B (en) | 2012-09-05 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN200910154977A Expired - Fee Related CN101713373B (en) | 2009-12-07 | 2009-12-07 | Four-stroke hydraulic free piston engine with variable stroke |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101892942B (en) * | 2010-06-01 | 2013-09-04 | 浙江大学 | Single piston hydraulic free-piston engine capable of reducing pumping flow pulsation |
| CN102661237B (en) * | 2012-05-15 | 2014-10-15 | 北京理工大学 | Semiautomatic flow distribution type hydraulic free piston engine |
| CN102705076A (en) * | 2012-06-19 | 2012-10-03 | 吉林大学 | Return flow scavenging type hydraulic free piston diesel engine |
| CN104141535B (en) * | 2013-05-10 | 2017-03-29 | 马晓东 | Four-stroke ic formula fluid power motor |
| CN103511120B (en) * | 2013-09-22 | 2015-10-21 | 吉林大学 | For the piston of free-piston engine |
| CN109498349A (en) * | 2019-01-22 | 2019-03-22 | 孙双双 | A kind of clinical obstetrics auxiliary natural labor device |
| CN117231585B (en) * | 2023-11-16 | 2024-01-09 | 河北智昆精密传动科技有限公司 | Speed reducer load mechanism |
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|---|---|---|---|---|
| CN86107512A (en) * | 1986-10-29 | 1988-06-01 | 姜中璋 | Pressure energy motive power machine |
| US5556262A (en) * | 1991-11-19 | 1996-09-17 | Innas Free Piston B.V. | Free-piston engine having a fluid energy unit |
| US5829393A (en) * | 1994-07-27 | 1998-11-03 | Innas Free Piston, B.V. | Free-piston engine |
| CN101566106A (en) * | 2008-12-12 | 2009-10-28 | 北京理工大学 | Compression stroke realization device of two-stroke hydraulic free piston engine |
-
2009
- 2009-12-07 CN CN200910154977A patent/CN101713373B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN86107512A (en) * | 1986-10-29 | 1988-06-01 | 姜中璋 | Pressure energy motive power machine |
| US5556262A (en) * | 1991-11-19 | 1996-09-17 | Innas Free Piston B.V. | Free-piston engine having a fluid energy unit |
| US5829393A (en) * | 1994-07-27 | 1998-11-03 | Innas Free Piston, B.V. | Free-piston engine |
| CN101566106A (en) * | 2008-12-12 | 2009-10-28 | 北京理工大学 | Compression stroke realization device of two-stroke hydraulic free piston engine |
Non-Patent Citations (5)
| Title |
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| JP特开平10-61455A 1998.03.03 |
| JP特开平7-279683A 1995.10.27 |
| 夏必忠 等.液压自由活塞发动机的能量平衡分析.《内燃机工程》.2002,第23卷(第03期),76-80. * |
| 夏必忠 等.液压自由活塞发动机起动过程的能量分析.《农业机械学报》.2003,第34卷(第04期),1-3,38. * |
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| CN101713373A (en) | 2010-05-26 |
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