CN103511120A - Piston for free piston engine - Google Patents
Piston for free piston engine Download PDFInfo
- Publication number
- CN103511120A CN103511120A CN201310432230.0A CN201310432230A CN103511120A CN 103511120 A CN103511120 A CN 103511120A CN 201310432230 A CN201310432230 A CN 201310432230A CN 103511120 A CN103511120 A CN 103511120A
- Authority
- CN
- China
- Prior art keywords
- piston
- cylinder piston
- hydraulic cylinder
- free
- eccentric rod
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Abstract
The invention relates to a piston for a free piston engine. The piston comprises an air cylinder piston, a hydraulic cylinder piston and an anti-collision rod which is in screw connection to the outer end of the hydraulic cylinder piston. The air cylinder piston is connected with the hydraulic cylinder piston in a deviation axis mode through an eccentricity rod and a flexible assembly. One end of the eccentricity rod is inserted into and fixed on a boss at the bottom inside the air cylinder piston to be detachably connected with the air cylinder piston in a deviation axis mode, the other end of the eccentricity rod is detachably, coaxially and fixedly connected with the hydraulic cylinder piston through the flexible assembly. The piston can automatically adapt to the coaxiality deviation between an engine air cylinder and a hydraulic cylinder, and is prevented from rotating in the process of working.
Description
Technical field
The present invention relates to the piston for free-piston engine, particularly a kind of piston that is applicable to two-stroke loop scavenging free-piston engine.
Background technique
Free-piston engine is compared with conventional engine, and maximum feature is there is no connecting rod, and its piston becomes topmost moving element.For two-stroke reverseflow type hydraulic free-piston engine, piston one end is subject to gas load, and one end is subject to hydraulic oil active force, is also subject to gravity and surface friction drag simultaneously, and piston is reciprocating under the force action of above power.The cylinder of motor and the axis of oil hydraulic cylinder should be coaxial in theory, but because parts machining and assembly process exist deviation, and can not strict guarantee coaxial, therefore the piston of design must adapt to the deviation of the coaxality of cylinder and oil hydraulic cylinder automatically.Two-stroke loop scavenging motor, its piston or piston ring can not rotate around axis in the course of the work, so piston or piston ring should have anti-rotation ability.And current free-piston, its cylinder piston and hydraulic cylinder piston are to be rigidly connected, and can not effectively realize comparatively ideal working state.
Summary of the invention
The object of the invention is the above-mentioned defect existing in order to overcome the piston of current free-piston engine, propose a kind of improved piston for free-piston engine, can automatically adapt to the coaxiality deviation of cylinder and oil hydraulic cylinder and prevent that piston from rotating in the course of the work.
The present invention, for the piston of free-piston engine, comprises cylinder piston, hydraulic cylinder piston and is screwed onto the crash bar on hydraulic cylinder piston outer end, forms Under Asymmetrical connect between described cylinder piston and hydraulic cylinder piston by an eccentric rod and flexible unit.
Plant to be fixed on and on the boss of cylinder piston inner bottom part, be removable Under Asymmetrical with cylinder piston and be connected in one end of described eccentric rod, and its other end is removable concentric by described flexible unit and hydraulic cylinder piston and is fixedly connected with.
Described flexible unit is by rubber column and be nested with respectively the tubbiness module composition at Qi two ends, by these two assemblies respectively with hydraulic cylinder piston and eccentric rod bolt.
The present invention's piston is packed into after motor, and when piston has been disturbed while rotatablely moving trend, due to cylinder piston and the hydraulic cylinder piston disalignment of piston, body and oil hydraulic cylinder will hinder rotatablely moving of piston, realize the effect of piston anti-rotating.
Because adopting flexible unit, the cylinder piston of piston of the present invention and hydraulic cylinder piston be connected, in the time of in the deformation band allowing, rubber column in its flexible unit can freely change along the axial and circumferential directions, once the axis of cylinder and oil hydraulic cylinder, have and exceed predetermined departure, flexible unit can make up deviation automatically.
Therefore, the plunger designs scheme that the present invention proposes, can automatically adapt to the coaxiality deviation of cylinder and oil hydraulic cylinder and prevent that piston from rotating in the course of the work.
Accompanying drawing explanation
Fig. 1 is a kind of piston structure schematic diagram for free-piston engine;
Fig. 2 is the structural representation of cylinder piston shown in Fig. 11;
Fig. 3 is the side view of Fig. 2;
Fig. 4 is the structural representation of eccentric rod shown in Fig. 15;
Fig. 5 is the side view of Fig. 5;
Fig. 6 is the structural representation of the assembly of tubbiness shown in Fig. 17;
Fig. 7 is the structural representation of the assembly of tubbiness shown in Fig. 19;
Fig. 8 is the structural representation of pressing plate shown in Fig. 13;
Fig. 9 is the structural representation of hydraulic cylinder piston shown in Fig. 1 10.
Embodiment
The embodiment who provides below in conjunction with accompanying drawing is described in further detail the present invention.
Referring to figs. 1 through 8, a kind of piston for free-piston engine, comprise cylinder piston 1, hydraulic cylinder piston 10 and be screwed onto the crash bar 11 on hydraulic cylinder piston 10 outer ends, between described cylinder piston 1 and hydraulic cylinder piston 10, by an eccentric rod 5 and flexible unit 6, form Under Asymmetrical and connect.
Plant to be fixed on and on the boss 1.1 of cylinder piston 1 inner bottom part, be removable Under Asymmetrical with cylinder piston 1 and be connected in one end of described eccentric rod 5, its other end is removable concentric by described flexible unit 6 and hydraulic cylinder piston 10 and is fixedly connected with.
On the grafting axial plane of described eccentric rod 5 and cylinder piston bottom boss 1.1 and cylinder piston base boss 1.1 seams be provided with corresponding installation directional plane (A), and by circlip for shaft 2 and the pressing plate 3 that is arranged on cylinder piston bottom boss seam 1.1 by fastening screw trip bolt, eccentric rod 5 is fixing.
The rubber column 8 that described flexible unit 6 is HS60-HS80 by hardness and the tubbiness assembly 7 and 9 that is nested with respectively Qi two ends form, by these two assemblies 7 and 9 respectively with hydraulic cylinder piston 10 and eccentric rod 5 bolts.
The top of described cylinder piston 1 is toroidal combustion chamber 1.2, is respectively equipped with four road compression rings annular groove 1.3 and twice oil ring installation annular groove 1.4 are installed, and be evenly equipped with lubricant oil oilhole 1.5 in oil ring installation annular groove 1.4 on the outer wall of cylinder piston front and back ends.
As shown in Figure 9, described hydraulic cylinder piston 10 has two active sections, is respectively equipped with guiding annular groove 10.1 and closure gasket groove 10.2 on each active section.
Because the cylinder piston of piston of the present invention 1 is eccentric structures with hydraulic cylinder piston 10, cylinder and oil hydraulic cylinder should be also eccentric installations, and the same with the eccentric direction of piston.The pressure being subject to due to piston two ends is larger, and offset D should be as far as possible little, and its size and bias direction are according to the suffered power in piston two ends and gravity and surface friction drag calculative determination.
Claims (6)
1. the piston for free-piston engine, comprise cylinder piston (1), hydraulic cylinder piston (10) and be screwed onto the crash bar (11) on hydraulic cylinder piston (10) outer end, it is characterized in that: between described cylinder piston (1) and hydraulic cylinder piston (10), by an eccentric rod (5) and flexible unit (6), forming Under Asymmetrical and connect.
2. the piston for free-piston engine according to claim 1, it is characterized in that: plant and be fixed on that the boss (1.1) of cylinder piston (1) inner bottom part is upper to be removable Under Asymmetrical with cylinder piston (1) and to be connected in one end of described eccentric rod (5), its other end is removable concentric by described flexible unit (6) with hydraulic cylinder piston (10) and is fixedly connected with.
3. the piston for free-piston engine according to claim 2, it is characterized in that: on the grafting axial plane of described eccentric rod (5) and cylinder piston bottom boss (1.1) and cylinder piston base boss (1.1) seam be provided with corresponding installation directional plane (A), and by circlip for shaft (2) and the pressing plate (3) that is arranged on cylinder piston bottom boss seam (1.1) by fastening screw trip bolt, eccentric rod (5) is fixing.
4. the piston for free-piston engine according to claim 2, it is characterized in that: described flexible unit (6) consists of rubber column (8) and the tubbiness assembly (7 and 9) that is nested with respectively Qi two ends, by these two assemblies (7 and 9) respectively with hydraulic cylinder piston (10) and eccentric rod (5) bolt.
5. the piston for free-piston engine according to claim 1, it is characterized in that: the top of described cylinder piston (1) is toroidal combustion chamber (1.2), on the outer wall of cylinder piston front and back ends, be respectively equipped with four road compression rings annular groove (1.3) and twice oil ring installation annular groove (1.4) are installed, and be evenly equipped with lubricant oil oilhole (1.5) in oil ring installation annular groove (1.4).
6. the piston for free-piston engine according to claim 1, is characterized in that: described hydraulic cylinder piston (10) has two active sections, is respectively equipped with guiding annular groove (10.1) and closure gasket groove (10.2) on each active section.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310432230.0A CN103511120B (en) | 2013-09-22 | 2013-09-22 | For the piston of free-piston engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310432230.0A CN103511120B (en) | 2013-09-22 | 2013-09-22 | For the piston of free-piston engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103511120A true CN103511120A (en) | 2014-01-15 |
| CN103511120B CN103511120B (en) | 2015-10-21 |
Family
ID=49894428
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310432230.0A Expired - Fee Related CN103511120B (en) | 2013-09-22 | 2013-09-22 | For the piston of free-piston engine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103511120B (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5709184A (en) * | 1997-01-13 | 1998-01-20 | General Motors Corporation | Piston pin and rod bushing for non-round piston |
| EP1920152A1 (en) * | 2005-09-01 | 2008-05-14 | Mahle International GmbH | Two-piece piston for an internal combustion engine |
| CN101182837A (en) * | 2007-11-30 | 2008-05-21 | 西安交通大学 | Double-acting free-piston type expansion-compression unit |
| CN101520000A (en) * | 2009-03-30 | 2009-09-02 | 浙江大学 | Single-piston hydraulic free-piston engine with vibration damping scavenging pumps |
| CN101713373A (en) * | 2009-12-07 | 2010-05-26 | 浙江大学 | Four-stroke hydraulic free piston engine with variable stroke |
| CN102705076A (en) * | 2012-06-19 | 2012-10-03 | 吉林大学 | Return flow scavenging type hydraulic free piston diesel engine |
| CN203532084U (en) * | 2013-09-22 | 2014-04-09 | 吉林大学 | Piston used for free piston engine |
-
2013
- 2013-09-22 CN CN201310432230.0A patent/CN103511120B/en not_active Expired - Fee Related
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5709184A (en) * | 1997-01-13 | 1998-01-20 | General Motors Corporation | Piston pin and rod bushing for non-round piston |
| EP1920152A1 (en) * | 2005-09-01 | 2008-05-14 | Mahle International GmbH | Two-piece piston for an internal combustion engine |
| CN101182837A (en) * | 2007-11-30 | 2008-05-21 | 西安交通大学 | Double-acting free-piston type expansion-compression unit |
| CN101520000A (en) * | 2009-03-30 | 2009-09-02 | 浙江大学 | Single-piston hydraulic free-piston engine with vibration damping scavenging pumps |
| CN101713373A (en) * | 2009-12-07 | 2010-05-26 | 浙江大学 | Four-stroke hydraulic free piston engine with variable stroke |
| CN102705076A (en) * | 2012-06-19 | 2012-10-03 | 吉林大学 | Return flow scavenging type hydraulic free piston diesel engine |
| CN203532084U (en) * | 2013-09-22 | 2014-04-09 | 吉林大学 | Piston used for free piston engine |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103511120B (en) | 2015-10-21 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN205036722U (en) | But toper slide bearing of high damping automatic compensation wearing and tearing | |
| CN203532084U (en) | Piston used for free piston engine | |
| CN105179100A (en) | Piston and connecting rod assembly | |
| CN202668031U (en) | Disassembly and assembly structure of reduction box output shaft and flange plate | |
| CN204164159U (en) | A kind of engine cam thrust device | |
| CN103511120B (en) | For the piston of free-piston engine | |
| CN104214206B (en) | A kind of engine cam thrust brake | |
| CN104015202A (en) | Hydraulic tandem elastic driver | |
| CN109296586A (en) | A kind of hydraulic cylinder | |
| CN103711669B (en) | Eccentric abrasion prevention guide device and mortar pump | |
| CN203223434U (en) | Stroke adjustment mechanism provided with mechanical lock device | |
| CN212919173U (en) | Camshaft dismouting appurtenance | |
| CN103742476A (en) | Spirally swinging hydraulic cylinder | |
| CN102979783A (en) | Locking cylinder for full-stroke rolling machine | |
| CN106930855A (en) | A kind of piston | |
| CN102878041A (en) | Plunger high-pressure pump | |
| CN203189775U (en) | Top-loading fixed ball valve | |
| CN203009453U (en) | Locking cylinder for total travel rolling machine | |
| CN202251956U (en) | Floating gap seal with high speed, high frequency and high abrasion resistance | |
| CN202451501U (en) | Novel hydraulic cylinder | |
| CN205559412U (en) | Cylinder that burnishing machine was used | |
| CN203717688U (en) | Novel serpentine spring coupling | |
| CN103882905A (en) | Hydraulic pump for excavator, and excavator with same | |
| CN209370191U (en) | A kind of high life buffering hydraulic cylinder | |
| CN204113795U (en) | A kind of oil hydraulic cylinder outer press cover locking device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20151021 Termination date: 20180922 |