CN203532084U - Piston used for free piston engine - Google Patents
Piston used for free piston engine Download PDFInfo
- Publication number
- CN203532084U CN203532084U CN201320584441.1U CN201320584441U CN203532084U CN 203532084 U CN203532084 U CN 203532084U CN 201320584441 U CN201320584441 U CN 201320584441U CN 203532084 U CN203532084 U CN 203532084U
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- piston
- cylinder piston
- hydraulic cylinder
- free
- eccentric rod
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Abstract
The utility model relates to a piston used for a free piston engine. The piston comprises an air cylinder piston, a hydraulic cylinder piston and an anti-collision rod connected to the outer end of the hydraulic cylinder piston in a screwed mode. The air cylinder piston and the hydraulic cylinder piston are connected in an off-axis mode through an eccentric rod and a flexible assembly, namely, one end of the eccentric rod is fixedly inserted into a boss at the bottom inside the air cylinder piston and detachably connected with the air cylinder piston in an off-axis mode, and the other end of the eccentric rod is detachably and fixedly connected with the hydraulic cylinder piston in a coaxial mode through the flexible assembly. The piston can be automatically adapted to coaxial offset between an engine air cylinder and a hydraulic cylinder, and the piston is prevented from rotating in the working process.
Description
Technical field
The utility model 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 purpose of this utility model 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 utility model is for the piston of free-piston engine, comprise cylinder piston, hydraulic cylinder piston and be screwed onto the crash bar on hydraulic cylinder piston outer end, between described cylinder piston and hydraulic cylinder piston, by an eccentric rod and flexible unit, form Under Asymmetrical and connect.
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 its two ends, by these two assemblies respectively with hydraulic cylinder piston and eccentric rod bolt.
The piston of the utility model 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 the utility model piston 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 the utility model 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 utility model.
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 being nested with respectively at its 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 the utility model piston 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) is by rubber column (8) and be nested with respectively tubbiness assembly (7 and 9) at its two ends and form, 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 |
|---|---|---|---|
| CN201320584441.1U CN203532084U (en) | 2013-09-22 | 2013-09-22 | Piston used for free piston engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320584441.1U CN203532084U (en) | 2013-09-22 | 2013-09-22 | Piston used for free piston engine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203532084U true CN203532084U (en) | 2014-04-09 |
Family
ID=50418299
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320584441.1U Withdrawn - After Issue CN203532084U (en) | 2013-09-22 | 2013-09-22 | Piston used for free piston engine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203532084U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103511120A (en) * | 2013-09-22 | 2014-01-15 | 吉林大学 | Piston for free piston engine |
-
2013
- 2013-09-22 CN CN201320584441.1U patent/CN203532084U/en not_active Withdrawn - After Issue
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103511120A (en) * | 2013-09-22 | 2014-01-15 | 吉林大学 | Piston for free piston engine |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20140409 Effective date of abandoning: 20151021 |
|
| C25 | Abandonment of patent right or utility model to avoid double patenting |