EP2045449B1 - Lubrication device of four-stroke engines - Google Patents

Lubrication device of four-stroke engines Download PDF

Info

Publication number
EP2045449B1
EP2045449B1 EP08017381A EP08017381A EP2045449B1 EP 2045449 B1 EP2045449 B1 EP 2045449B1 EP 08017381 A EP08017381 A EP 08017381A EP 08017381 A EP08017381 A EP 08017381A EP 2045449 B1 EP2045449 B1 EP 2045449B1
Authority
EP
European Patent Office
Prior art keywords
oil
crankshaft
aperture
crank case
lubrication device
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.)
Active
Application number
EP08017381A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP2045449A1 (en
Inventor
Shao-Yu Li
Yeu-Jou Lin
Huan-Lung Gu
Chi-Wei Chang
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Industrial Technology Research Institute ITRI
Original Assignee
Industrial Technology Research Institute ITRI
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Industrial Technology Research Institute ITRI filed Critical Industrial Technology Research Institute ITRI
Publication of EP2045449A1 publication Critical patent/EP2045449A1/en
Application granted granted Critical
Publication of EP2045449B1 publication Critical patent/EP2045449B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
    • F01M1/00—Pressure lubrication
    • F01M1/04—Pressure lubrication using pressure in working cylinder or crankcase to operate lubricant feeding devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
    • F01M1/00—Pressure lubrication
    • F01M1/06—Lubricating systems characterised by the provision therein of crankshafts or connecting rods with lubricant passageways, e.g. bores
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
    • F01M11/00—Component parts, details or accessories, not provided for in, or of interest apart from, groups F01M1/00 - F01M9/00
    • F01M11/02—Arrangements of lubricant conduits
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
    • F01M11/00—Component parts, details or accessories, not provided for in, or of interest apart from, groups F01M1/00 - F01M9/00
    • F01M11/06—Means for keeping lubricant level constant or for accommodating movement or position of machines or engines
    • F01M11/062—Accommodating movement or position of machines or engines, e.g. dry sumps
    • F01M11/064—Movement
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
    • F01M13/00—Crankcase ventilating or breathing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
    • F01M13/00—Crankcase ventilating or breathing
    • F01M13/02—Crankcase ventilating or breathing by means of additional source of positive or negative pressure
    • F01M13/021—Crankcase ventilating or breathing by means of additional source of positive or negative pressure of negative pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
    • F01M9/00—Lubrication means having pertinent characteristics not provided for in, or of interest apart from, groups F01M1/00 - F01M7/00
    • F01M9/06—Dip or splash lubrication
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
    • F01M9/00—Lubrication means having pertinent characteristics not provided for in, or of interest apart from, groups F01M1/00 - F01M7/00
    • F01M9/10—Lubrication of valve gear or auxiliaries
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
    • F01M1/00—Pressure lubrication
    • F01M1/06—Lubricating systems characterised by the provision therein of crankshafts or connecting rods with lubricant passageways, e.g. bores
    • F01M2001/062—Crankshaft with passageways

Definitions

  • This invention generally relates to four-stroke engine, and more specifically, to a lubrication device that is applicable to four-stroke engines.
  • four-stroke engines have advantages of less noise and lower emission pollution, they have disadvantage as well; cams and valves of the four-stroke engines require proper lubrication; therefore, a four-stroke engine must be integrated with a lubrication device; however, when a four-stroke engine integrated with a lubrication device and is applied to a work machine, such as a chain saw or others, due to the practical application environment, user is likely to manipulate the four-stroke engine at an extremely slanting or even upside down angle, and at this moment, lubricant stored inside crank case of the lubrication device is likely to flow into exhaust valves as well as flow path of air mixture in the combustion air, thereby further interfering with effective air combustion and causing engine oil leakage.
  • FIGS. 1A and 1B are diagrams of a lubrication device of four-stroke engines according to claims of US 6,213,078 ; wherein, an oil hole 11 in communication with lubricant tank 12 is allocated underneath a cam room 10, and the lubricant recycles back to the lubricant tank 12 via the oil hole 11; manipulations of this kind of design at some sloping angles are likely to cause the lubricant to directly reflow to valve via the cam room 10, and then flow out of the engine via a breathing pipe between valve chamber and air filter.
  • a lubrication device of four-stroke engines is disclosed according to U.S. Patent No. 6,170,456 , which mainly allocates a stirring chamber 14 on a long and narrow concave underneath the crank case 13, and also forms an oil hole 15 at a bottom of the stirring chamber 14 in communication with an engine oil tank; although this kind of design is capable of preventing massive lubricant from flowing into the crank case when the engine is at a slanting angle, it is not capable of providing other mechanical parts of machine, such as cam and gas valves and others, with effective lubrication when the engine is operationally turning over for a long time period; in addition, the traditional breathing pipe that is externally connecting to air filter generally is not commonly allocated with filter therein, therefore, when the engine is operating at a slanting angle, lubricant is likely to flow out via the breathing pipe, thereby causing problems of unnecessary lubricant consumption and air filter contamination.
  • a lubrication device of four-stroke engines with the features of claim 1 is provided according to the present invention.
  • the stirring chamber can have a long and narrow concave located inside the lubricant tank, wherein, each of the oil holes is at least located on two sides and bottom end of the long and narrow concave, but not restricted to the stated herein, each of the oil holes can further be located on bottom end of the stirring chamber nearby two sides of the long and narrow concave.
  • basic principle of the first rotation angle and the second rotation angle is that they are alternating to each other, there is no specific restriction, and in one embodiment, the first rotation angle and the second rotation angle are alternating to each other at an angle of 180 degrees.
  • the oil supply channel can comprises a fist axial aperture, which is connected to the interior of the crank case, and a first radial aperture, which connects the first axial aperture and the pipeline.
  • the said oil supply channel can further comprises a first eccentric aperture, which connects the first axial aperture and the interior of the crank case, and a first airtight oil plug is allocated at axle center of the crankshaft first section corresponding to a rim of the first eccentric aperture.
  • a first obstruction block can be allocated on external side of the crankshaft first section corresponding to the first radial aperture, the first obstruction block can be, for instance, in the form of a half circular ring and is for covering area beyond the first rotation angle.
  • the oil recycling channel can be accordingly designed and comprises a second axial aperture and a second radial aperture that connects the second axial aperture and the cam room.
  • the said oil recycling channel can further comprises a second eccentric aperture that connects the second axial aperture and the interior of the crank case, and a second airtight oil plug is allocated at axle center of the crankshaft second section corresponding to a rim of the second eccentric aperture.
  • a second obstruction block can be allocated on the crankshaft second section corresponding to the second radial aperture, and the second obstruction block can be, for instance, in the form of a half circular ring and is for covering area beyond the second rotation angle.
  • the oil supply channel can comprise a first slanting aperture that has a first end and a second end, the first end is connecting to the pipeline while the second end is connecting to the interior of the crank case.
  • the said oil supply channel can further comprises a first eccentric aperture that connects the second end and the interior of the crank case, and a first airtight oil plug is allocated at axle center of the crankshaft first section corresponding to a rim of the first eccentric aperture.
  • a first obstruction block can be allocated on external side of the crankshaft first section corresponding to the first end, the first obstruction block can be, for instance, in the form of a half circular ring and is for covering area beyond the first rotation angle.
  • the oil recycling channel can also be accordingly designed and comprises a second slanting aperture that has a first end and a second end, the first end is connecting to the cam room while the second end is connecting to the interior of the crank case.
  • the said oil recycling channel further comprises a second eccentric aperture that connects the second end and the interior of the crank case, and a second airtight oil plug is allocated at axle center of the crankshaft second section corresponding to a rim of the second eccentric aperture.
  • a second obstruction block is allocated on external side of the crankshaft second section corresponding to the first end, the second obstruction structure is, for instance, in the form of a half circular ring and is for covering area beyond the second rotation angle.
  • the present invention further provides a lubrication device of four-stroke engines, which is applicable to four-stroke engines that have cylinder, a crank case, a rocker arm room and a cam room that are connecting to each other, and a breathing pipe;
  • the crank case has a crankshaft that is divided into a crankshaft first section, a connection part, and a crankshaft second section;
  • the cylinder has a piston connecting rod therein, and the piston connecting rod is connecting to the connection part;
  • the cam room is allocated with cam that has camshaft;
  • the lubrication device comprises: a lubricant tank, which is connecting to underneath the crank case and is for containing lubricant; a stirring chamber, which is allocated underneath the crank case and partially located inside the lubricant tank, the stirring chamber has at least one oil hole in communication with the lubricant tank; an oil stirring rod, which is allocated at one end of the piston connecting rod and is set inside the stirring chamber, the oil stirring rod is for stirring lubricant to oil
  • the present invention further provides a lubrication device of four-stroke engines, which is applicable to four-stroke engines that have cylinder, a crank case, a rocker arm room and a cam room that are connecting to each other, and a breathing pipe;
  • the crank case has a crankshaft that is divided into a crankshaft first section, a connection part, and a crankshaft second section;
  • the cylinder has a piston connecting rod therein, and the piston connecting rod is connecting to the connection part;
  • the lubrication device comprises: a lubricant tank, which is connecting to underneath the crank case and is for containing lubricant; a stirring chamber, which is allocated underneath the crank case and partially located inside the lubricant tank, the stirring chamber has at least one oil hole in communication with the lubricant tank; an oil stirring rod, which is allocated at one end of the piston connecting rod and is set inside the stirring chamber, the oil stirring rod is for stirring lubricant to oil mists; an oil supply path, the oil supply path
  • the design of the stirring chamber in the foresaid embodiments can be omitted. That is, the lubricant tank is connecting to underneath the crank case for containing lubricant, and the oil stirring rod is allocated at one end of the piston connecting rod corresponding to the stirring chamber for stirring lubricant to oil mists.
  • the lubrication device of four-stroke engine of the present invention mainly has the rocker arm room and the crank case connect to each other, and the alternating design of the oil supply and oil-absorption channels enables lubricant mists to cycle from the crank case through the rocker arm room to cam room and then to be re-absorbed into the crank case, thereby allowing engine to be manipulated at various angles; also the design of the oil supply path and the oil recycling path provides proper lubrication, and in accordance with the design of eccentric apertures and airtight oil plugs, situation of excess lubricant flowing out of the crank case can be avoided, thereby avoiding consequent problems of excessive lubricant consumption and engine piston jammed in cylinder caused by insufficient lubrication; in addition, the design of the exhaust channel employs centrifugal force to prevent oil drops or massive oil mists from entering, thereby avoiding problems of lubricant consumption and air filter contamination caused by massive lubricant flowing out through the breathing pipe.
  • the lubrication device of four-stroke engines is applicable to four-stroke engines that at least have a cylinder 2, a crank case 3, a rocker arm room 4 for rocker arms operating valves and a cam room 5 that are connecting to each other, and a breathing pipe 6, thereby enabling lubricant mist to be cycling from the crank case 3 through the rocker arm room 4 to the cam room 5 and then be absorbed back to the crank case 3, and allowing users to manipulate the engines at various angles.
  • the lubrication device is applied to, for instance, four-stroke engines of wet-sump design, wherein, the crank case and lubricant tank are connecting to each other, the lubrication device is applicable to any four-stroke engine that must integrate with lubrication device.
  • the crank case 3 has a crankshaft, the crankshaft is divided into a crankshaft first section 32 and a crankshaft second section 33 that are connected to each other via a connection part 31 and move simultaneously;
  • the cylinder 2 consists of a piston connecting rod 21, which is connecting to the connection part 31, and a piston 22, which is connecting to top end of the piston connecting rod 21;
  • the rocker arm room 4 has a rocker arm 41, and the cam room 5 is allocated with a cam 51 that has a camshaft 52, also the rocker arm 41 is for simultaneously activating the cam 51, in addition, the cam room 5 has a breathing pipe 6 that is for externally connecting to a air filter (not shown in the FIG.) for emitting exhaust fume. Since the principle of internal combustion of four-stroke engines is well understood by those in the industry, and is not a creative feature of the present invention, therefore, descriptions of engine movement principles and detailed mechanism design will not be repeated herein.
  • the lubrication device comprises: a lubricant tank 7, which is integrated to underneath the crank case 3 for containing lubricant 71; a stirring chamber 34, which is allocated beneath the crankshaft 3 and partially located inside the lubricant tank 7, the stirring chamber 34 has at least one oil hole 342 in communication with the lubricant tank 7; an oil stirring rod 23, which is allocated at bottom end of the piston connecting rod 21 and is set inside the stirring chamber 34, the oil stirring rod 23 is for stirring the lubricant 71 to oil mists; an oil supply path, the oil supply path consists of a pipeline 42, which connects the rocker arm room 4 and the crank case 3, and an oil supply channel 321, which is allocated inside the crankshaft first section 32 of the crank case 3 and correspondingly connecting the pipeline 42 and interior of the crank case 3, and when the crankshaft first section 32 is at a first rotation angle, the oil supply channel 321 opens to supply the oil mists through the rocker arm room 4 to the cam room 5; and an oil recycling path, the oil recycling path
  • the stirring chamber 34 consists of a long and narrow concave 341 located inside the lubricant tank 7, wherein, in addition to two sides and bottom end of the long and narrow concave 341, each of the oil holes 342 can also be formed on bottom of the stirring chamber 34 nearby the two sides of the long and narrow concave 341, thereby providing engines with proper oil dropping channel at various angles even in a upside down situation, as well as balancing pressure between the crank case 3 and the lubricant tank 7; the crankshaft first section 32 and the crankshaft second section 33 are connected to each other via the connection part 31 and consequently move simultaneously, the basic principle of the said first rotation angle and the said second rotation angle is that they are alternating to each other, but there is no specific restriction; in the present embodiment, the first rotation angle and the second rotation angle are alternating to each other at an angle of 180 degrees as an example, but not restricted to the stated herein.
  • the oil supply channel 321 is allocated inside the crankshaft first section 32, in the present embodiment, the oil supply channel 321 comprises a first axial aperture 3211, which is connecting to interior of the crank case 3, and a first radial aperture 3213, which connects the first axial aperture 3211 and the pipeline 42; in addition, the oil supply channel 321 further comprises a first eccentric aperture 3215, which connects the first axial aperture 3211 and the interior of the crank case 3, and a first airtight oil plug 3217 is allocated at axle center of the crankshaft first section 32 corresponding to a rim of the first eccentric aperture 3215.
  • a first obstruction block 323 is allocated on external side of the crankshaft first section 32 corresponding to the first radial aperture 3213, the first obstruction block 323 is in the form of a half circular ring and is for covering area of the first radial aperture 3213 of the crankshaft first section 32 beyond the first rotation angle; one end of the foresaid pipeline 42 is connecting to one side of the crank case 3 corresponding to the first radial aperture 3213, namely, space of opposite side of the first obstruction block 323, thereby connecting to the first radial aperture 3213 via the space.
  • the foresaid first radial aperture 3213 and the first obstruction block 323 compose a supply switch that controls oil supply; when the crankshaft first section 32 rotates to the first rotation angle, in other words, the first radial aperture 3213 is away from territory of the first obstruction block 323, and then in accordance with descending route of the piston 22, a positive pressure generated herein enables the oil mists to travel via the pipeline 42 passing the rocker arm room 4 to the cam room 5, thereby reaching objective of oil mists transmission.
  • the oil recycling channel 331 is allocated on crankshaft second section 33; the oil recycling channel 331 comprises a second axial aperture 3311, which is connecting to the interior of the crank case 3, and a second radial aperture 3313, which connect the second axial aperture 3311 and the cam room 5.
  • the oil recycling channel 331 further comprises a second eccentric aperture 3315, which are connecting the second axial aperture 3311 and the interior of the crank case 3, and a second airtight oil plug 3317, which is allocated at the axle center of the crankshaft second section 33 corresponding to a rim of the second eccentric aperture 3315, since the second airtight oil plug 3317 mostly encloses exterior of the axle center of the second axial aperture 3311, the particles of oil drops can be flung off via end side of the crankshaft second section 33 by centrifugal force while rotating, accordingly, pressure difference prevents the lubricant from traveling to the second axial aperture 3311 via the second eccentric aperture 3315.
  • the crankshaft second section 33 is allocated with a second obstruction block 333 corresponding to the second radial aperture 3313, the second obstruction block 333 is, for instance, in the form of a half circular ring and is for covering area of the second radial aperture 3313 of the crankshaft second section 33 beyond the second rotation angle.
  • the second radial aperture 3313 and the second obstruction block 333 compose a reabsorption switch that controls oil mists or oil drops; in the present embodiment, when the crankshaft second section 33 rotates to the second rotation angle, in other words, the second radial aperture 3313 is away from territory of the second obstruction block 333, oil mists or oil drops can travel to the interior of the crank case 3 via the second radial aperture 3313 and the second axial aperture 3311, and in accordance with ascending route of the piston 22, a negative pressure generated inside the crank case 3 enables the oil mists to be re-absorbed and recycled.
  • the second eccentric aperture 3315 is designed to employ centrifugal force for preventing oil drops inside the stirring chamber 34 from reflowing into the second axial aperture 3311.
  • the first rotation angle and the second rotation angle of the present embodiment are alternating to each other at an angle of 180 degrees as an example; in other words, when the crankshaft first section 32 rotates to the first rotation angle, the crankshaft second section 33 is at an angle 180 difference from the first rotation angle; therefore, the oil supply channel 321 and the oil recycling channel 331 open alternately, but not at the same time.
  • crankshaft of the crank case 3 of the present embodiment consists of a crankshaft first section 32 and a crankshaft second section 33 that are connecting to each other via a connecting part 33 and moving simultaneously thus
  • the said crankshaft can also be replaced with a single crankshaft
  • the single crankshaft can be divided into a first section, connection part, and a second section, and then form the foresaid oil supply channel 321 and oil recycling channel 331 on the first section and the second section respectively to achieve the same technique effect; since allocation of a single piece crankshaft or two pieces fabricated crankshaft that move simultaneously inside crank case of engine is commonly adopted technique by the industry, it has no need of detailed descriptions with illustrations herein.
  • the cam room 5 has a cam 51 allocated therein, the cam 51 and a cam gear 53 are fixed on a camshaft 52, and the cam gear 53 is activated by a crankshaft gear 335 that is fixed on the crankshaft second section 33.
  • the camshaft 52 is allocated with an exhaust channel 521 in order to connect the cam room 5 and the breathing pipe 6, and the breathing pipe 6 is for connecting to air filter, not shown in the FIG.
  • the exhaust channel 521 comprises a third axial aperture 5211, which is allocated on the camshaft 52 and is connecting to the breathing pipebreathing pipe 6, and a third radial aperture 5213, which connects the third axial aperture 5211 and the cam room 5. Since the rotation of the cam 51 and the camshaft 52 enables the third radial aperture 5213 to create fling centrifugal force, neither particles of oil drops nor massive oil mists will travel through the exhaust channel into the air filter while engine is operating.
  • the lubricant 71 capable of entering into the crank case 3 through oil holes 342 located on bottom of the long and narrow concave 341 underneath the crank case 3, and when the crankshaft, including the crankshaft first section 32 and crankshaft second section 33, is rotating, it simultaneously activates the oil stirring rod 23 at bottom end of the piston connecting rod 21 to stir lubricant inside the long and narrow concave 341 to form oil drops and oil mists, the oil drops and oil mists can be dispensed evenly inside space of the crank case 3, and the oil holes on two sides of the long and narrow concave 341 is capable of balancing interior pressures of the crank case 3 and lubricant tank 7.
  • crankshaft including the crankshaft first section 32 and crankshaft second section 33 rotates counterclockwise to the first rotation angle, it enables the piston connecting rod 21 to descend, and consequently the interior pressure of the crank case 3 begins to increase due to reduced volume, thereby forcing oil mists inside the crank case 3 to travel into the oil supply channel 321 inside the crankshaft first section 32, and then through the first eccentric aperture 3215 and the first axial aperture 3211 to the first radial aperture 3213, at this moment, the relation between the first radial aperture 3213 and the first obstruction block 323 is in an opening state, the first obstruction block 323 is opposite to an opening space in communication with the pipeline 42, therefore the oil mists are capable of traveling into the pipeline 42, and then the oil mists can travel to the rocker arm room 4 through the pipeline 42 to lubricate the rocker arm 41 and other components, as well as travel to the cam room 5 to lubricate the cam 51, cam gear 53, and crankshaft gear 335; the design of the third radial aperture 52
  • lubrication can be done by utilizing lubricant originally stored inside the long and narrow concave 341 of the crank case 3, and oil drops can be continuously provided to the crankshaft first section 32 via oil holes 342 on bottom of the stirring chamber 34 nearby two sides of the long and narrow concave 341, and then the oil drops are cracked into oil mists by rotating the crankshaft first section 32 for lubrication purpose; and in order to prevent excess lubricant from entering the rocker arm room 4, cam room 5, and air filter and consequent excessive lubrication or dead engine; the design of the oil supply channel 321, which employs centrifugal force as well as auto control over opening/closing, provides the lubrication device with capability that allows oil mists to pass through but secludes the oil drops of larger particles from passing through, thereby effectively avoiding excessive lubrication; and the design of the oil recycling channel 331 provides the lubrication
  • the lubrication device is capable of providing proper lubrication and allowing engines to be manipulated normally at various angles.
  • the oil supply channel 321 mainly comprises a first axial aperture 3211 allocated on a crankshaft first section 32 and a first radial aperture 3213
  • the oil recycling channel 331 mainly comprises a second axial aperture 3311 allocated on a crankshaft second section 33 and a second radial aperture 3313.
  • the first axial aperture 3211 and the first radial aperture 3213 of the crankshaft first section 32 can be replaced by a first slanting aperture 3212 that has a first end and a second end, plainly, the first end is connecting to the pipeline, and the second end is connecting to interior of the crank case, and designs of the first eccentric aperture and the first obstruction block are the same as in the previous embodiment, there is no need of repetitive descriptions herein. Similarly, as shown in FIG.
  • the second axial aperture 3311 and the second radial aperture 3313 of the crankshaft second section 33 can be replaced by a second slanting aperture 3312 that has a first end and a second end, plainly, the first end is connecting to cam room, and the second end is connecting to interior of crank case, and designs of the second eccentric aperture and the second obstruction block are also the same as in the previous embodiment, there is no need of repetitive description herein.
  • the exhaust channel 521 is disposed in the cam room 5 for avoiding problems, such as massive lubricant flowing out from the breathing pipe 6, and consequent massive lubricant consumption, air filter contamination and engine extinguished resulting from massive lubricant accumulated in the breathing pipe.
  • the positions of the exhaust channel 521 and the breathing pipe 6 are not limited by the foresaid embodiments.
  • the position of the breathing pipe 6 can be optionally designed in the four-stroke engine depending upon demand of practical application.
  • the breathing pipe 6 is connected to a room space, which is not the space in the cam room 5 shown in FIG. 3A , in the four-stroke engine.
  • the breathing pipe 6 is connected to the channel 61, which is a space in the engine at the side of the cam room, between the cylinder 2 and the crank case 3.
  • the remaining designs in FIG. 11 are similar to those in FIG. 3A . Since the breathing pipebreathing pipe 6 is not hermetically connected to the camshaft 52, there is no fling centrifugal force generated from the rotation of the cam 51 and the camshaft 52. Therefore, this embodiment can be used in the engine generating fine oil drops or little oil mists during non-long term of manipulation, such that air smoothly flows into the channel 61 and lubricant is prevented from flowing out of the breathing pipebreathing pipe 6.
  • the lubrication device of the four-stroke engine can be designed without the oil supply channel 321 and the oil recycling channel 331; that is, only the exhaust channel 521 is designed instead in the lubrication device.
  • FIG. 12 shows another embodiment of a lubrication device of a four-stroke engine.
  • the four-stroke engine includes a cylinder 2, a crank case 3, a rocker arm room 4 for rocker arms operating valves and a cam room 5 that are connecting to each other, and a breathing pipe 6, thereby enabling lubricant mist to be cycling from the crank case 3 through the rocker arm room 4 to the cam room 5 and then be absorbed back to the crank case 3, and allowing users to manipulate the engines at various angles.
  • This embodiment differs from that shown in FIG. 3A in that the lubricant tank 7 and the stirring chamber 34 are integrally formed. That is, the lubricant tank 7 is not hermetical, such that lubricant is not isolated in the stirring chamber 34.
  • the oil stirring rod 23 is directly formed on one end of the piston connecting rod 21 corresponding to the lubricant tank 7 for directly stirring the lubricant to oil mists.
  • this embodiment is suitable for machines manipulated at smaller angles such as lawn mowers.
  • the designs of the oil supply channel, oil recycling channel, eccentric aperture and airtight oil plug are similar to those in the foresaid embodiments, and there is no need to repetitive description herein.
  • the breathing pipe 6 is disposed in the cam room 5.
  • the breathing pipe 6 can be disposed in the space connecting the cam room 5 and the rocker arm room 4, or disposed in the channel 61 between the cylinder 2 and the crank case 3.
  • the lubrication device of the four-stroke engine can be designed without the oil supply channel 321 and the oil recycling channel 331; that is, only the exhaust channel 521 is designed instead in the lubrication device.
  • the lubrication device of four-stroke engines mainly has the rocker arm room and the crank case connecting to each other, and the design of alternating oil supply and oil-absorption channels enables lubricant mists to cycle from the crank case through the rocker arm room to cam room and then to be re-absorbed into the crank case, thereby allowing engine to be manipulated at various angles; also the design of the oil supply path and the oil recycling path provides proper lubrication, and in accordance with the design of eccentric apertures and airtight oil plugs, situation of excess lubricant flowing out of the crank case can be avoided; in addition, the design of the exhaust channel employs centrifugal force to prevent oil drops or massive oil mists from entering, thereby avoiding problems of excessive lubricant consumption and air filter contamination caused by massive lubricant flowing out through the breathing pipe. Therefore, the lubrication device of four-stroke engines provided by the present invention overcomes various drawbacks of the prior art, and conform to patent application elements: industrial applicability,

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Lubrication Of Internal Combustion Engines (AREA)
EP08017381A 2007-10-03 2008-10-02 Lubrication device of four-stroke engines Active EP2045449B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
TW96137017 2007-10-03
TW097137665A TWI322221B (en) 2007-10-03 2008-10-01 Lubricating device for four-stroke engine

Publications (2)

Publication Number Publication Date
EP2045449A1 EP2045449A1 (en) 2009-04-08
EP2045449B1 true EP2045449B1 (en) 2011-12-14

Family

ID=40089978

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08017381A Active EP2045449B1 (en) 2007-10-03 2008-10-02 Lubrication device of four-stroke engines

Country Status (4)

Country Link
EP (1) EP2045449B1 (ja)
JP (1) JP4796111B2 (ja)
AT (1) ATE537335T1 (ja)
TW (1) TWI322221B (ja)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104763524A (zh) * 2015-03-27 2015-07-08 山东华盛农业药械有限责任公司 小型风冷四冲程汽油机
CN114458412B (zh) * 2022-01-26 2023-10-17 浙江亚特电器股份有限公司 一种用于发动机的搅油结构和发动机

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB435146A (en) * 1934-05-14 1935-09-16 Alfred Prestwich John Improvements in and relating to the lubrication of internal-combustion engines, compressors and the like
JPH06299830A (ja) * 1993-02-17 1994-10-25 Ishikawajima Shibaura Mach Co Ltd ４サイクルエンジンの潤滑装置
TW487770B (en) 1995-12-15 2002-05-21 Honda Motor Co Ltd Lubricating system in a 4-stroke engine
JP2000073729A (ja) * 1998-09-01 2000-03-07 Kioritz Corp ４サイクル内燃機関
TW370160U (en) 1998-12-31 1999-09-11 Ind Tech Res Inst 4-stroke engine lubrication system
JP3839993B2 (ja) * 1999-04-19 2006-11-01 株式会社共立 ４サイクル内燃エンジン
JP3975046B2 (ja) * 2000-03-14 2007-09-12 本田技研工業株式会社 ハンドヘルド型四サイクルエンジン
JP3388229B2 (ja) * 2000-12-25 2003-03-17 本田技研工業株式会社 四サイクルエンジンの潤滑装置
JP3701946B2 (ja) * 2003-01-14 2005-10-05 川崎重工業株式会社 ４サイクルエンジン

Also Published As

Publication number Publication date
EP2045449A1 (en) 2009-04-08
JP2009092066A (ja) 2009-04-30
ATE537335T1 (de) 2011-12-15
TW200916644A (en) 2009-04-16
JP4796111B2 (ja) 2011-10-19
TWI322221B (en) 2010-03-21

Similar Documents

Publication Publication Date Title
US7584736B2 (en) Lubrication device of four-stroke engines
CA2340578C (en) Handheld type four-cycle engine
RU2526610C2 (ru) Система смазки для четырехтактного двигателя
US5947068A (en) Four-stroke cycle internal combustion engine
US7481197B1 (en) Lubrication device of four-stroke engines
EP1288454B1 (en) System for lubricating valve-operating mechanism in engine
KR100472097B1 (ko) 엔진의 밸브 작동 기구
JP3894723B2 (ja) エンジンのヘッドカバー構造
EP2045449B1 (en) Lubrication device of four-stroke engines
AU2647601A (en) Handheld type four-cycle engine
CN101586488B (zh) 发动机的气缸盖润滑结构
CA2341289C (en) Oil mist generation system in handheld type four-cycle engine
CA2357136C (en) Valve-operating mechanism in 4-cycle engine
US20090272360A1 (en) Lubrication device of four-stroke engines
JP4661862B2 (ja) 内燃機関のオイル供給構造
JP4371563B2 (ja) エンジンの動弁機構
JP4394819B2 (ja) ハンドヘルド型エンジンにおける調時伝動装置の潤滑装置
JP3854050B2 (ja) 四サイクルエンジンの潤滑装置
JP3881830B2 (ja) ハンドヘルド型四サイクルエンジンの動弁機構
JP4458727B2 (ja) ハンドヘルド型四サイクルエンジンのブリーザ装置
JP4015389B2 (ja) エンジンの動弁機構潤滑装置
JP3881831B2 (ja) 四サイクルエンジン
JP3819690B2 (ja) 四サイクルエンジン
JP3854049B2 (ja) 四サイクルエンジン

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MT NL NO PL PT RO SE SI SK TR

AX Request for extension of the european patent

Extension state: AL BA MK RS

17P Request for examination filed

Effective date: 20090714

AKX Designation fees paid

Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MT NL NO PL PT RO SE SI SK TR

17Q First examination report despatched

Effective date: 20091201

GRAP Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOSNIGR1

GRAS Grant fee paid

Free format text: ORIGINAL CODE: EPIDOSNIGR3

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MT NL NO PL PT RO SE SI SK TR

REG Reference to a national code

Ref country code: GB

Ref legal event code: FG4D

REG Reference to a national code

Ref country code: CH

Ref legal event code: EP

REG Reference to a national code

Ref country code: IE

Ref legal event code: FG4D

REG Reference to a national code

Ref country code: DE

Ref legal event code: R096

Ref document number: 602008011909

Country of ref document: DE

Effective date: 20120209

REG Reference to a national code

Ref country code: SE

Ref legal event code: TRGR

REG Reference to a national code

Ref country code: NL

Ref legal event code: VDEP

Effective date: 20111214

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20111214

Ref country code: NO

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20120314

LTIE Lt: invalidation of european patent or patent extension

Effective date: 20111214

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: HR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20111214

Ref country code: SI

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20111214

Ref country code: NL

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20111214

Ref country code: LV

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20111214

Ref country code: GR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20120315

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: CY

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20111214

Ref country code: BE

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20111214

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SK

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20111214

Ref country code: EE

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20111214

Ref country code: IS

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20120414

Ref country code: CZ

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20111214

Ref country code: BG

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20120314

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: PT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20120416

Ref country code: RO

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20111214

Ref country code: PL

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20111214

REG Reference to a national code

Ref country code: AT

Ref legal event code: MK05

Ref document number: 537335

Country of ref document: AT

Kind code of ref document: T

Effective date: 20111214

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DK

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20111214

26N No opposition filed

Effective date: 20120917

REG Reference to a national code

Ref country code: DE

Ref legal event code: R097

Ref document number: 602008011909

Country of ref document: DE

Effective date: 20120917

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: AT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20111214

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: ES

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20120325

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: MC

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20121031

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FI

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20111214

REG Reference to a national code

Ref country code: IE

Ref legal event code: MM4A

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20121002

Ref country code: CH

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20121031

Ref country code: LI

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20121031

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: MT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20111214

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: TR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20111214

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LU

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20121002

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: HU

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20081002

REG Reference to a national code

Ref country code: FR

Ref legal event code: PLFP

Year of fee payment: 8

REG Reference to a national code

Ref country code: FR

Ref legal event code: PLFP

Year of fee payment: 9

REG Reference to a national code

Ref country code: FR

Ref legal event code: PLFP

Year of fee payment: 10

REG Reference to a national code

Ref country code: FR

Ref legal event code: PLFP

Year of fee payment: 11

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 20231027

Year of fee payment: 16

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: SE

Payment date: 20231027

Year of fee payment: 16

Ref country code: IT

Payment date: 20231023

Year of fee payment: 16

Ref country code: FR

Payment date: 20231025

Year of fee payment: 16

Ref country code: DE

Payment date: 20231027

Year of fee payment: 16