Forced oil supply way for piston of two-stroke engine
By designing a forced oil supply circuit of the piston in a two-stroke engine, the lubricating oil is directly transported to the piston surface, the problem of premixed lubricating oil not meeting the insufficient lubricating of high operating conditions is solved, and more efficient lubrication effect and higher engine efficiency are achieved.
Patent Information
- Application Number
- CN202422200218.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-09
- Publication Date
- 2025-06-17
- Estimated Expiration
- 2034-09-09
AI Technical Summary
When existing two-stroke engines operate at high operating conditions or use unconventional special fuels, premixed lubricant cannot ensure that the engine is sufficiently lubricated, resulting in insufficient lubrication.
A two-stroke engine piston forced oil supply oil circuit is designed. By setting oil grooves on the cylinder liner, a lubricating oil channel is formed to directly transport lubricating oil to the piston surface in the engine, enhancing the lubricating effect of the piston components.
It realizes a lubrication method without premix, reduces the difficulty of design and manufacturing, improves the efficiency of the engine, and can meet the needs of higher operating conditions.
Smart Images
Figure CN222991615U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a technology in the field of engines, specifically a forced oil supply circuit for a piston of a two-stroke engine. Background Art
[0002] When the engine is running, lubricating oil is needed to lubricate the moving parts. Generally, a two-stroke engine relies on a mixed fuel with lubricating oil premixed in a certain proportion to achieve the purpose of lubricating the moving parts; when the engine needs to operate at a higher working condition or use unconventional special fuels to operate the engine, the premixed lubricating oil may not be able to ensure that the engine obtains sufficient lubrication.
[0003] In order to solve the above problems existing in the prior art, the present utility model comes into being. Content of the Utility Model
[0004] Aiming at the above deficiencies of the prior art, the present utility model provides a forced oil supply circuit for a piston of a two-stroke engine, which directly conveys lubricating oil to the surface of the piston in the engine by adding a lubricating oil channel, thereby enhancing the lubrication effect on the surface of the piston components.
[0005] The present utility model relates to a forced oil supply circuit for a piston of a two-stroke engine, including:
[0006] A cylinder block, provided with a piston and a first through hole; an oil nozzle is installed at the first through hole, and the oil nozzle is communicated with the oil outlet of a lubricating oil oil pump through a oil pipe;
[0007] A cylinder liner, provided with an oil groove; one end of the oil groove is provided with an oil storage pool, the other end of the oil groove is provided with a second through hole, and a lubricating oil channel is formed by being closed by the cylinder block wall surface; the oil storage pool of the lubricating oil channel is communicated with the first through hole, and the second through hole of the lubricating oil channel is located below the gas ring of the piston ring groove when the piston in the cylinder block is at the bottom dead center position.
[0008] For some specific implementation schemes, the minimum distance between the second through hole and the gas ring is 0.5 - 1 mm.
[0009] For some specific implementation schemes, the cylinder liner is provided with an air passage port, and the oil groove is arranged to avoid the air passage port.
[0010] Compared with the prior art, the present utility model has the following technical effects:
[0011] 1) An oil groove is arranged on the cylinder liner to supply lubricating oil separately to provide lubrication. Therefore, premixing is not required, and no additional oil circuit design is needed on the engine cylinder block, and the design and manufacturing difficulty is relatively low;
[0012] 2) The position of the second through hole for the lubricating oil droplet injection point is lower than the piston ring groove. While the lubricating oil fully lubricates the piston, it does not directly enter the combustion chamber to participate in combustion. Compared with the mixed fuel using premixed lubricating oil, the engine efficiency is improved, and the engine can meet the requirements of operating under higher working conditions. Description of the Drawings
[0013] Figure 1 Axial side view of the cylinder liner in Embodiment 1;
[0014] Figure 2 Axial top view of the cylinder liner in Embodiment 1;
[0015] Figure 3 For Figure 2 S-direction view of the cylinder liner in
[0016] Figure 4 Schematic diagram of the engine in Embodiment 1;
[0017] Figure 5 For Figure 4 L-L cross-sectional view in
[0018] Figure 6 Schematic diagram of the structure when the piston is at the bottom dead center in Embodiment 1;
[0019] In the figure:
[0020] 100, cylinder block; 101, first through hole; 102, piston; 103, compression ring;
[0021] 200, cylinder liner; 201, oil groove; 202, second through hole; 203, oil storage pool; 204, air passage opening. Detailed Description of the Embodiment
[0022] The present utility model will be described in detail below in conjunction with the drawings and the specific embodiments.
[0023] Embodiment 1
[0024] As Figure 1 And Figure 6 shown, this embodiment relates to a two-stroke engine, which includes a cylinder block 100 and a cylinder liner 200. The cylinder block 100 is pressed into the sleeve hole of the cylinder liner 200, and the two are in clearance fit.
[0025] The cylinder block 100 is provided with a first through hole 101 and a piston 102. The piston 102 is provided with a plurality of ring grooves, and the uppermost ring groove is a compression ring 103; an oil nozzle is correspondingly installed at the first through hole 101, and the oil nozzle is communicated with the oil outlet of the lubricating oil oil pump through a oil pipe. When the lubricating oil oil pump works, it supplies lubricating oil to the first through hole (not shown in the drawings).
[0026] AsFigures 1 to 6 As shown in the figure, the cylinder liner 200 is provided with an oil groove 201; one end of the oil groove 201 is provided with a second through hole 202, the other end of the oil groove 201 is provided with an oil storage pool 203, and the oil groove 201 is arranged to avoid the air passage port 204, so the overall flow direction is winding, approximately in the shape of a several-character; after the cylinder block 100 is pressed into the socket hole of the cylinder liner 200, the oil groove 201 forms a lubricating oil passage through the wall surface of the socket hole of the cylinder block; the oil storage pool 203 of the lubricating oil passage is communicated with the first through hole 101, and the second through hole 202 of the lubricating oil passage is located below the gas ring 103 in the piston ring groove when the piston in the cylinder block is at the bottom dead center position.
[0027] The vertex of the second through hole 202 is lower than the lowest point of the gas ring 103, and the distance between the two is preferably 0.5 - 1 mm.
[0028] During the operation of the engine in this embodiment, the ECU controls the lubricating oil pump to pump oil from the lubricating oil tank according to the engine working conditions; the lubricating oil flows into the cylinder block through the lubricating oil passage and will not directly flow into the combustion chamber to participate in combustion; when the piston in the cylinder block is at the bottom dead center position, the lubricating oil fully contacts the outer circular surface of the piston to form an oil film, realizing the lubrication of the piston in the cylinder; the excess lubricating oil enters the crankcase driven by the piston and atomizes under the impact of high-speed rotating components such as the crankshaft and connecting rod, enhancing the lubrication effect on the moving components.
[0029] It should be emphasized that: the above is only a preferred embodiment of the present invention, and it does not impose any form of limitation on the present invention. Any simple modification, equivalent change and modification made to the above embodiment according to the technical essence of the present invention still fall within the scope of the technical solution of the present invention.
Claims
1. A two-stroke engine piston forced oil supply circuit, characterized in that: include: The cylinder body is provided with a piston and a first through hole; an oil nozzle is installed at the first through hole, and the oil nozzle is connected with the oil outlet of the lubricating oil pump through an oil pipe; The cylinder liner is provided with an oil groove; an oil storage tank is provided at one end of the oil groove, and a second through hole is provided at the other end of the oil groove, which is closed by the cylinder body wall to form a lubricating oil channel; the oil storage tank of the lubricating oil channel is connected with the first through hole, and the second through hole of the lubricating oil channel is located below the piston ring groove gas ring when the piston is at the bottom dead center position in the cylinder body.
2. The two-stroke engine piston forced oil supply circuit according to claim 1, characterized in that: The minimum distance between the second through hole and the air ring is 0.5-1 mm.
3. The forced oil supply circuit for the piston of a two-stroke engine according to claim 1, characterized in that: The cylinder sleeve is provided with an airway opening, and the oil groove is arranged away from the airway opening.