CN103850747A - Four-stroke engine - Google Patents
Four-stroke engine Download PDFInfo
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- CN103850747A CN103850747A CN201410118451.5A CN201410118451A CN103850747A CN 103850747 A CN103850747 A CN 103850747A CN 201410118451 A CN201410118451 A CN 201410118451A CN 103850747 A CN103850747 A CN 103850747A
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- stroke engine
- oil
- crankcase
- lubricating oil
- oil tank
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Abstract
The invention provides a light weight four-stroke engine with a simple structure, which comprises a cylinder, a crankcase, a lubrication oil tank, a rocker arm room and a transmission room, wherein a crankshaft is arranged in the crankcase; the transmission room is communicated with the rocker arm room. The light weight four-stroke engine also comprises a first oil duct which is used for connecting the lubrication oil tank with the crankcase, a second oil duct which is used for communicating the lubrication oil tank with the transmission room and a return oil channel which is used for communicating the crankcase with the lubrication oil tank; a one-way valve is arranged in the return oil channel; a part of the first oil duct and the second oil duct is a common oil duct. According to the light weight four-stroke engine, the lubricant oil way is simplified, the structure of the engine is simple, the weight is reduced, the oil way channel is short, the sealing property is good, and the all-position work of the engine can be met.
Description
Technical field
The present invention relates to a kind of four stroke engine.
Background technique
Nowadays four stroke engine has also been widely used in various machinery equipments, and for example small utility gasoline engine is used on various small instruments and tools, as mowing machine, cut-off machine or other Backpack power machines etc.The corresponding different working environment of lubrication system of four stroke engine has different designing requirements, some machines in use, engine output shaft direction can not change, for example hand-push type mower, engine output shaft is perpendicular to ground, therefore engine lubrication system is as long as ensure that output shaft is in the time of this direction, and engine lubrication system can works fine; And Handheld lawn mower, when pruning shears work, user can change operation posture to adapt to operation, therefore motor can tilt, even be inverted (for example, while originally use, lubricating oil tank was in bottom, and when inversion, lubricating oil tank is just at top), so all there is good lubrication effect when the type motor need to meet the work of full position, so-called full position, motor can tilt at any angle or be inverted.
The four stroke engine of prior art can reach above-mentioned usage requirement, the four stroke engine that for example US6213079 of ROBIN house journal shows, but its complex structure, component are more, quality weight, particularly in cylinder block, there is comparatively complicated oil line pipe, make processed complex, affected cost and the weight of four stroke engine.So the component in motor overall structure are simplified, the light demand of quality also becomes day by day strong.
Summary of the invention
The present invention is in order to solve the problem of prior art, propose a kind of simple in structure, light-weighted four stroke engine, it comprises cylinder, crankcase, lubricating oil tank, rocker arm chamber and Transmission Room, in crankcase, be provided with bent axle, described Transmission Room is communicated with rocker arm chamber, described four stroke engine also comprises the first oil duct that connects lubricating oil tank and crankcase, be communicated with the second oil duct of lubricating oil tank and Transmission Room, be communicated with the oily passage of returning of described crankcase and lubricating oil tank, return in oily passage and be provided with one-way valve, described the first oil duct and the second oil duct have part oil duct for sharing oil duct.
It is below attached technological scheme of the present invention.
Preferably, described the first oil duct comprises the first oil transportation channel and suction passage, and described the second oil duct comprises the second oil transportation channel and suction passage, and described shared oil duct is suction passage.
Preferably, described the first oil transportation channel is arranged in bent axle, and described the first oil transportation channel comprises at least one filler opening and at least one oil outlet, has at least a filler opening to be arranged on bent axle surface.
Preferably, described filler opening is through hole, and described through hole is communicated with the first oil transportation channel.
Preferably, described the first oil duct is along with bent axle rotation can intermittent conduction.
Preferably, described the second oil transportation channel is the gap between the bent axle diameter of axle and engine housing.
Preferably, described Transmission Room is communicated with by the first drainback passage with lubricating oil tank.
Preferably, described the first drainback passage has the first opening towards lubricating oil tank, and the first opening is roughly positioned at the geometrical center of lubricating oil tank.
Preferably, rocker arm chamber is communicated with by drainback passage with crankcase, and described drainback passage has one at least, is provided with safety check in drainback passage.
Preferably, it also comprises Rocker arm chamber cap and air filter, between Rocker arm chamber cap and air filter, is provided with vent passage, and the parts of lubricating oil in rocker arm chamber is through entering air filter by road.
Preferably, described four stroke engine also comprises valve chamber, and valve chamber is arranged between crankcase and lubricating oil tank, and described one-way valve is arranged between valve chamber and crankcase, and valve chamber is communicated with lubricating oil tank.
Preferably, described four stroke engine is overhead cam engine, and described valve chamber is positioned at lubricating oil tank.
Useful technique effect of the present invention: simplify the lubricating oil path of four stroke engine, made engine structure simple, weight reducing, asphalt channel is short, sealing number; Meanwhile, can meet motor full position work.
Brief description of the drawings
Fig. 1 is the sectional view of embodiment of the present invention four stroke engine.
Fig. 2 is another sectional view of embodiment of the present invention four stroke engine.
Fig. 3 is embodiment of the present invention four stroke engine lubrication system schematic diagram.
Plan view when Fig. 4 is the inversion of embodiment of the present invention four stroke engine.
Fig. 5 is the schematic diagram of the mode of execution of a kind of the second oil transportation channel of the present invention.
Fig. 6 is the schematic diagram of the mode of execution of another kind of the second oil transportation channel of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the present invention will be further described.
Be embodiment of the present invention four stroke engine as shown in Figures 1 to 3, it is a kind of overhead cam engine, comprises engine housing 1, crankcase 2, rocker arm chamber 3, Transmission Room 4, piston 8, Carburetor 10 and lubricating oil tank 5.Engine housing 1 comprises cylinder 13 and crankcase body 14, cylinder 13 and the crankcase body 14 that the is positioned at cylinder 13 belows formation engine housing that is stitched together.Described rocker arm chamber 3 is positioned at cylinder top, and rocking arm is for controlling the Kai Heguan of valve.Described Transmission Room 4 is positioned at cylinder side, in Transmission Room, be provided with large belt wheel 41, small pulley 42 and driving belt (not shown), small pulley drives belt to rotate, belt takes the lubricant oil in Transmission Room to Transmission Room top, and the lubricant mist in Transmission Room enters in rocker arm chamber 3 by the path between Transmission Room 4 and rocker arm chamber 3.In crankcase 2, be provided with bent axle 6, piston 8 pumps and is with dynamic crankshaft 6 to rotate.In described lubricating oil tank 5, can store lubricant oil 51, between lubricating oil tank 5 and crankcase 2, can be communicated with by the first oil duct, the first oil duct comprises suction passage 7 and the first oil transportation channel 74, described the first oil transportation channel 74 is the passages that are positioned at bent axle 6 inside, therefore needn't on engine housing, offer passage, simplify the structure.The first oil transportation channel comprises the oil outlet 75 and the filler opening 72 that are arranged on bent axle, described filler opening 72 is positioned at the side of bent axle 6, as a kind of mode of execution, filler opening 72 can be perpendicular to crankshaft rotating axis and the through hole (as shown in Figure 5) crossing with the first oil transportation channel, now on bent axle 6, just there are two filler openings that are oppositely arranged, other mode of executions can also be arranged to filler opening the through hole angled with crankshaft rotating axis, also can only in bent axle 6 sides, a filler opening be set, be communicated with the first oil transportation channel 74, those skilled in the art can arrange according to engine design requirement and performance.Lubricant oil in the first oil transportation channel enters by filler opening 72, and oil outlet 75 is discharged.In the time that bent axle 6 rotates, in the time that filler opening 72 is aimed at suction passage 7, the first oil transportation channel 74 is communicated with suction passage 7, lubricant oil can enter in crankcase from lubricating oil tank, in the time that filler opening 72 is not aimed at suction passage 7, the first oil transportation channel 74 is not communicated with suction passage 7, and lubricant oil can not enter crankcase from lubricating oil tank, therefore the first oil duct is intermittent conduction, and this kind of mode can better must be controlled the lubricants capacity entering in crankcase.In the time that motor is inverted or tilt, lubricant oil in crankcase may make lubricant oil liquid level flood oil outlet 75(when for example piston is in descending process due to piston up-down), parts of lubricating oil is regurgitated into the first oil duct, in the present embodiment, can pass through filler opening 72 setting positions, angle, sectional area or the isoparametric control of shape, make in the time that piston is in descending process, filler opening 72 be not communicated with suction passage 7 or Lifetime shorter, make the lubricant oil of regurgitating can not affect the good operation of whole lubrication system.Described suction passage 7 has filler opening 71, and it can be connected with float 52, the more convenient lubricant oil that must draw in lubricating oil tank.Between described lubricating oil tank 5 and Transmission Room 4, can be communicated with by the second oil duct, the second oil duct comprises suction passage 7 and the second oil transportation channel 73, and suction passage 7 is that the first oil duct and the second oil duct share oil duct.The second oil transportation channel 73 is that inside is provided with the gap between the bent axle diameter of axle and the engine housing of the first oil transportation channel 74, and lubricant oil enters in Transmission Room 4 by above-mentioned gap.Described Transmission Room 4 is communicated with by the first drainback passage 45 with lubricating oil tank 5, makes the parts of lubricating oil in Transmission Room 4 to get back to lubricating oil tank by the first drainback passage.The first drainback passage has first opening 451 of opening towards lubricating oil tank, and in the present embodiment, the first opening 451 is roughly positioned at the geometrical center of lubricating oil tank, and therefore, in the time that motor tilts to use, the lubricant oil in fuel tank can submergence the first opening 451.
Two kinds of mode of executions of the second oil transportation channel 73 as shown in Figure 5 and Figure 6, Fig. 5 is the first mode of execution, gap between the bent axle diameter of axle and the engine housing of above-mentioned the second oil transportation channel is annular pass 731, in accompanying drawing, annular pass 731 is around whole bent axle, therefore no matter piston in up or descending, annular pass 731 is all open, i.e. suction passage 7 and Transmission Room normal open; Those skilled in the art are known, owing to only needing piston in up process, and oil suction while being negative pressure in crankcase, annular pass 731 not necessarily need to be around whole bent axle, as long as in the time of piston stroking upward, annular pass 731 can be communicated with suction passage.The second mode of execution as shown in Figure 6, above-mentioned gap refers to that part bent axle is reamed the breach 731 ' of formation, in the time that piston is in up process, breach 731 ' is relative with suction passage 7, and lubricant oil can enter Transmission Room by the second oil duct, when piston is during in descending process, breach 731 ' is not aimed at suction passage 7, therefore the second oil duct just disconnects, and this kind of mode of execution the second oil duct is intermittent conduction, can effectively control the lubricants capacity that flows through the second oil duct.
The lubricating oil flow of the lubrication system below in conjunction with accompanying drawing 3 to the present embodiment four stroke engine is described further, arrow in figure represents the flow direction of lubricant oil, the present embodiment by piston pump produce periodic pressure change lubricant oil is circulated in lubrication system, it will be appreciated by those skilled in the art that, if adopting adds oil pump as power source, also can make lubrication system running, this is apparent.In the present embodiment, in the time that piston 8 moves from lower dead center to top dead center, in crankcase, produce negative pressure, lubricant oil flows into suction passage 7 from lubricating oil tank 5, if the first oil duct conducting, parts of lubricating oil enters crankcase by the first oil duct, the component in lubricated crankcase, and parts of lubricating oil enters Transmission Room by the second oil duct; If the first oil duct does not have conducting, lubricant oil enters Transmission Room by the second oil duct.Parts of lubricating oil in Transmission Room 4 makes lubricant oil be transferred to Transmission Room top from Transmission Room bottom by driving belt, because Transmission Room and rocker arm chamber are communicated with, (" connection " in the present invention refers to that liquid or gas can move to another chamber from a chamber, mode of communicating can need by passage or not passage, chamber is connected), lubricant oil is transported to rocker arm chamber by driving belt by the lubricant oil in Transmission Room, the component of lubricated rocker arm chamber; The lubricant oil of Transmission Room 4 belows flows back to lubricating oil tank by the first drainback passage 45.Simultaneously by being arranged on two the second parallel drainback passages 12 between crankcase 2 and rocker arm chamber 3, parts of lubricating oil enters crankcase from sliding rocker arm chamber, in two above-mentioned the second drainback passages, be provided with safety check 121, make lubricant oil flow to crankcase from rocker arm chamber, and can not flow to rocker arm chamber from crankcase, what in the present embodiment, safety check used is duckbill Valve.In the time that piston moves from top dead center to lower dead center, in crankcase, produce malleation, between crankcase and lubricating oil tank, have and return oily passage 25(to return oily passage can be hole or the pipe that extends into fuel tank, or other connection means), return and in oily passage, be provided with one-way valve 91, by the one-way valve 91 that is arranged on crankcase below, the lubricant oil in crankcase is pressed into lubricating oil tank 5, above-mentioned one-way valve 91 is leaf valve, leaf valve applies a determined power can in the time opening the lubricant oil flowing through, and makes lubricant oil more easily flow into lubricating oil tank.Part mist of oil in rocker arm chamber 3 enters vent passage 31 by the hole on Rocker arm chamber cap 32 and passage, and vent passage 31 is communicated with air filter 11, and vent passage can drain into mist of oil the Carburetor entry end in air filter, makes it enter combustion chambers burn.Further, improve as one, in order to make motor operation in the time tilting or be inverted more stable, can below crankcase 2, be provided with valve chamber 9, valve chamber 9 comprises sidewall 92 and bottom 93, and bottom 93 is provided with oil drainage hole 931(with reference to Fig. 2), top is communicated with or is closed by one-way valve 91 with crankcase.One-way valve 91 is arranged between crankcase and valve chamber, and in the time being malleation in crankcase 2, the lubricant oil in crankcase enters valve chamber 9 through one-way valve 91, and then enters lubricating oil tank 5 from valve chamber by oil drainage hole.As shown in Figure 4, the effect that valve chamber 9 is set is to make motor in the time being inverted or tilt to use, the lubricant oil that prevents lubricating oil tank interior 5 floods one-way valve 91, make the lubricant oil in crankcase cannot be pressed into lubricating oil tank, arrange after valve chamber 9, because valve chamber has certain altitude (certain length is extended in bottom from crankcase bottom to lubricating oil tank), therefore, in the time tilting or be inverted use, the lubricant oil in lubricating oil tank can not flood one-way valve 91.Described valve chamber is positioned at lubricating oil tank, is roughly positioned at lubricating oil tank middle part.
Four stroke engine of the present invention, component are few, and asphalt channel is short, and motor is in the time of the work of any position, and lubrication system can ensure the lubricated of the each parts of motor; And simplify controlling the main parts size crankcase of flow of lubrication and the structure of bent axle, alleviate quality.It is to be noted, above-mentioned preferred embodiment is only explanation technical conceive of the present invention and feature, its object is to allow person skilled in the art can understand content of the present invention and implement according to this, can not limit the scope of the invention with this, particularly oil duct, passage, path, these vocabulary of oil circuit not should be understood to must certain length, the tubular conduit of both ends open, as long as can make chamber (rocker arm chamber, crankcase, lubricating oil tank, Transmission Room all can be considered chamber) between can fluid be communicated with, lubricant oil or gas mixture can circulate between chamber, for example perforate, these are that those skilled in the art can understand, the embodiment of the present invention has only been to provide preferably mode of execution of one.All equivalences that Spirit Essence is done according to the present invention change or modify, within all should being encompassed in protection scope of the present invention.
Claims (12)
1. a four stroke engine, it comprises cylinder, crankcase, lubricating oil tank, rocker arm chamber and Transmission Room, in crankcase, be provided with bent axle, described Transmission Room is communicated with rocker arm chamber, it is characterized in that: described four stroke engine also comprises the first oil duct that connects lubricating oil tank and crankcase, be communicated with the second oil duct of lubricating oil tank and Transmission Room, be communicated with the oily passage of returning of described crankcase and lubricating oil tank, return in oily passage and be provided with one-way valve, described the first oil duct and the second oil duct have part oil duct for sharing oil duct.
2. four stroke engine as claimed in claim 1, is characterized in that: described the first oil duct comprises the first oil transportation channel and suction passage, and described the second oil duct comprises the second oil transportation channel and suction passage, and described shared oil duct is suction passage.
3. four stroke engine as claimed in claim 2, is characterized in that: described the first oil transportation channel is arranged in bent axle, and described the first oil transportation channel comprises at least one filler opening and at least one oil outlet, has at least a filler opening to be arranged on bent axle surface.
4. four stroke engine as claimed in claim 3, is characterized in that: described filler opening is through hole, and described through hole is communicated with the first oil transportation channel.
5. four stroke engine as claimed in claim 2, is characterized in that: described the first oil duct is along with bent axle rotation can intermittent conduction.
6. four stroke engine as claimed in claim 2, is characterized in that: described the second oil transportation channel is the gap between the bent axle diameter of axle and engine housing.
7. four stroke engine as claimed in claim 1, is characterized in that: described Transmission Room is communicated with by the first drainback passage with lubricating oil tank.
8. four stroke engine as claimed in claim 7, is characterized in that: described the first drainback passage has the first opening towards lubricating oil tank, and the first opening is roughly positioned at the geometrical center of lubricating oil tank.
9. four stroke engine as claimed in claim 1, is characterized in that: rocker arm chamber is communicated with by drainback passage with crankcase, and described drainback passage has one at least, is provided with safety check in drainback passage.
10. four stroke engine as claimed in claim 1, is characterized in that: it also comprises Rocker arm chamber cap and air filter, between Rocker arm chamber cap and air filter, is provided with vent passage, and the parts of lubricating oil in rocker arm chamber is through entering air filter by road.
11. four stroke engine as described in arbitrary claim in claim 1 to 10, it is characterized in that: described four stroke engine also comprises valve chamber, valve chamber is arranged between crankcase and lubricating oil tank, and described one-way valve is arranged between valve chamber and crankcase, and valve chamber is communicated with lubricating oil tank.
12. four stroke engine as claimed in claim 11, is characterized in that: described four stroke engine is overhead cam engine, and described valve chamber is positioned at lubricating oil tank.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410118451.5A CN103850747B (en) | 2014-01-13 | 2014-03-27 | Four-stroke engine |
Applications Claiming Priority (7)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420018248 | 2014-01-13 | ||
| CN2014100137979 | 2014-01-13 | ||
| CN2014200182486 | 2014-01-13 | ||
| CN201420018248.6 | 2014-01-13 | ||
| CN201410013797 | 2014-01-13 | ||
| CN201410013797.9 | 2014-01-13 | ||
| CN201410118451.5A CN103850747B (en) | 2014-01-13 | 2014-03-27 | Four-stroke engine |
Publications (2)
| Publication Number | Publication Date |
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| CN103850747A true CN103850747A (en) | 2014-06-11 |
| CN103850747B CN103850747B (en) | 2017-02-22 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410118451.5A Active CN103850747B (en) | 2014-01-13 | 2014-03-27 | Four-stroke engine |
| CN201420142571.4U Expired - Fee Related CN203783678U (en) | 2014-01-13 | 2014-03-27 | Four-stroke engine |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201420142571.4U Expired - Fee Related CN203783678U (en) | 2014-01-13 | 2014-03-27 | Four-stroke engine |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112282958A (en) * | 2020-10-30 | 2021-01-29 | 东风汽车集团有限公司 | Oil return channel structure of high-pressure cast aluminum alloy cylinder body |
| CN113586198A (en) * | 2021-09-03 | 2021-11-02 | 浙江鹰鸿园林机械有限公司 | Four-stroke engine lubrication system |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103850747B (en) * | 2014-01-13 | 2017-02-22 | 苏州科瓴精密机械科技有限公司 | Four-stroke engine |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201354658Y (en) * | 2009-02-27 | 2009-12-02 | 三阳工业股份有限公司 | Engine lubricating device |
| CN201635792U (en) * | 2010-03-04 | 2010-11-17 | 力帆实业(集团)股份有限公司 | Lubricating system for general-purpose gasoline engine |
| CN102434243A (en) * | 2010-09-09 | 2012-05-02 | 株式会社牧田 | Lubrication structure for four-stroke engine |
| CN202788976U (en) * | 2012-06-15 | 2013-03-13 | 苏州科瓴精密机械科技有限公司 | Four-stroke engine lubrication system |
| CN103321709A (en) * | 2012-06-15 | 2013-09-25 | 苏州科瓴精密机械科技有限公司 | Lubricating system for four-stroke engine |
| CN203783678U (en) * | 2014-01-13 | 2014-08-20 | 苏州科瓴精密机械科技有限公司 | Four-stroke engine |
-
2014
- 2014-03-27 CN CN201410118451.5A patent/CN103850747B/en active Active
- 2014-03-27 CN CN201420142571.4U patent/CN203783678U/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201354658Y (en) * | 2009-02-27 | 2009-12-02 | 三阳工业股份有限公司 | Engine lubricating device |
| CN201635792U (en) * | 2010-03-04 | 2010-11-17 | 力帆实业(集团)股份有限公司 | Lubricating system for general-purpose gasoline engine |
| CN102434243A (en) * | 2010-09-09 | 2012-05-02 | 株式会社牧田 | Lubrication structure for four-stroke engine |
| CN202788976U (en) * | 2012-06-15 | 2013-03-13 | 苏州科瓴精密机械科技有限公司 | Four-stroke engine lubrication system |
| CN103321709A (en) * | 2012-06-15 | 2013-09-25 | 苏州科瓴精密机械科技有限公司 | Lubricating system for four-stroke engine |
| CN203783678U (en) * | 2014-01-13 | 2014-08-20 | 苏州科瓴精密机械科技有限公司 | Four-stroke engine |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112282958A (en) * | 2020-10-30 | 2021-01-29 | 东风汽车集团有限公司 | Oil return channel structure of high-pressure cast aluminum alloy cylinder body |
| CN112282958B (en) * | 2020-10-30 | 2022-01-21 | 东风汽车集团有限公司 | Oil return channel structure of high-pressure cast aluminum alloy cylinder body |
| CN113586198A (en) * | 2021-09-03 | 2021-11-02 | 浙江鹰鸿园林机械有限公司 | Four-stroke engine lubrication system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN203783678U (en) | 2014-08-20 |
| CN103850747B (en) | 2017-02-22 |
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