WO2012073587A1 - Lubrication device for four-stroke engine - Google Patents

Lubrication device for four-stroke engine Download PDF

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Publication number
WO2012073587A1
WO2012073587A1 PCT/JP2011/072269 JP2011072269W WO2012073587A1 WO 2012073587 A1 WO2012073587 A1 WO 2012073587A1 JP 2011072269 W JP2011072269 W JP 2011072269W WO 2012073587 A1 WO2012073587 A1 WO 2012073587A1
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WO
WIPO (PCT)
Prior art keywords
oil
baffle plate
opening
wall member
passage
Prior art date
Application number
PCT/JP2011/072269
Other languages
French (fr)
Japanese (ja)
Inventor
敏裕 冨田
久保田　宏
浩二 杉山
眞樹 栗本
Original Assignee
株式会社マキタ
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Publication of WO2012073587A1 publication Critical patent/WO2012073587A1/en

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    • 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
    • F01M13/04—Crankcase ventilating or breathing having means for purifying air before leaving crankcase, e.g. removing oil
    • F01M13/0416—Crankcase ventilating or breathing having means for purifying air before leaving crankcase, e.g. removing oil arranged in valve-covers
    • 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
    • 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
    • F01M11/065—Position
    • F01M11/067—Position inverted, e.g. for inverted flight

Definitions

  • the present invention relates to a lubrication device for a four-cycle engine, and more particularly to a lubrication device for a four-cycle engine in which oil in the engine is hardly consumed even when used in various postures.
  • This 4-cycle engine tends to be heavier because it requires more parts than a 2-cycle engine.
  • a 2-cycle engine it is assumed that an operator works while carrying the work machine. The weight reduction of the engine is required.
  • Patent Document 1 and Patent Document 2 a four-cycle engine equipped with a lubrication device that circulates oil by utilizing pressure fluctuations in the crank chamber without separately providing a lubrication pump has been developed (see Patent Document 1 and Patent Document 2).
  • This lubricating device has a check valve provided at the bottom of the crank chamber. This check valve opens at the time of positive pressure, and oil or oil mist in the crank chamber is sent into the oil tank.
  • the oil or oil mist that has passed through the communication pipe provided in the oil tank is supplied to the locker chamber and the valve operating device that drives the locker chamber, and sufficient oil is supplied to the locker chamber and the valve operating device.
  • the oil accumulated in the locker chamber is returned to the crank chamber through a communication hole provided in the crank chamber that brings the crank chamber and the locker chamber into communication with each other when the piston moves upward.
  • a high oil concentration is required around the crankshaft, and a valve system does not require a higher oil concentration around the crankshaft.
  • oil or oil mist in the crank chamber is sent to the rocker chamber and the valve operating device without adjusting the concentration by utilizing the pressure fluctuation in the crank chamber.
  • the oil or oil mist is excessively fed into the chamber, the amount of oil staying in the locker chamber increases too much, and a lot of oil is discharged along with the discharge of blow-by gas into the combustion chamber.
  • the oil replenishment period is shortened, and failure to replenish oil may cause poor lubrication.
  • the amount of oil discharged into the combustion chamber becomes excessive, a large amount of oil is discharged from the muffler to the outside without being burned, which may adversely affect the environment.
  • the present invention has been made in view of such a background, and an object thereof is to provide a lubricating device for a four-cycle engine in which oil is hardly consumed.
  • the lubricating device for a four-cycle engine of the present invention has an oil tank, and the oil tank has a plate-shaped baffle plate that divides the oil tank into an upper side and a lower side.
  • An oil circulation path opening for supplying and circulating oil mist is disposed near the center of the oil tank and at an upper side position of the baffle plate, and the baffle plate has an upper side near the opening.
  • a wall member extending in the direction is formed (claim 1).
  • the lubrication device for a 4-cycle engine of the present invention can synergistically obtain the above effects, and can provide a 4-cycle engine in which oil is hardly consumed.
  • a through hole penetrating the baffle plate is formed at a position opposite to the opening of the wall member (Claim 2).
  • the lubricating device for a four-cycle engine in the present invention is such that the oil that has turned to the upper side of the baffle plate falls from the through hole before reaching the opening, and is more than necessary in the oil circulation path. It is possible to prevent the supply.
  • the through hole is formed in the vicinity of the wall member (Claim 3).
  • the lubricating device for a four-cycle engine causes the oil that has turned to the upper side of the baffle plate to fall more reliably from the through hole before the wall member, and the oil circulation path is more than necessary. Can be prevented from being supplied.
  • the wall member and the through hole are formed by cutting out and bending the baffle plate (claim 4).
  • Two or more wall members are formed so as to surround the opening (Claim 5).
  • the two or more through holes are independently formed by bending the baffle plate (Claim 6).
  • the baffle plate member remains between the through hole and the through hole connected to the through hole, and the strength of the baffle plate can be maintained.
  • the ceiling member is formed by further bending the wall member toward the opening (claim 7).
  • the lubricating device for a four-cycle engine according to the present invention prevents the oil scattered due to shaking due to use from being supplied directly to the opening, and is supplied to the oil circulation path more than necessary. Can be prevented.
  • the opening is open in the direction in which the baffle plate extends,
  • the wall member is formed at a position in three directions so as to surround the opening.
  • the wall member is formed of a member different from the baffle plate (claim 9).
  • the baffle plate also has a gasket function for sealing the oil tank (claim 10).
  • the baffle plate that divides the oil tank into an upper side and a lower side can also have a gasket function.
  • the 4-cycle engine lubrication device according to the present invention can provide a 4-cycle engine lubrication device in which oil is hardly consumed.
  • the direction is defined.
  • the upper direction refers to the upper direction in a positional relationship during storage or the like where the 4-cycle engine 1 is not used (upper side in FIG. 2).
  • This upper direction substantially coincides with the vertical upper direction in the state where the four-cycle engine 1 is used for the longest in the use state.
  • the direction opposite to the upper direction is referred to as the lower direction (the lower side in FIG. 2).
  • the direction in which the oil mist is sucked by the opening 31a is defined as the opening side direction (upper left direction in FIG. 2).
  • the direction opposite to the opening side direction is referred to as the counter-opening side direction (the lower right side in FIG. 2).
  • the right hand direction is defined as the back side direction (upper right direction in FIG. 2).
  • the direction opposite to the rear side direction is defined as the front side direction (the lower left direction in FIG. 2).
  • FIG. 1 shows a four-cycle engine when the piston is located at the top dead center.
  • the four-cycle engine 1 includes a cylinder block 3 in which a cylinder head 3 a is integrated, a crankcase 5 attached to a lower portion of the cylinder block 3 to form a crank chamber 5 a, and a crankcase 5 And an oil tank 7 disposed at a lower side position.
  • the oil tank 7 is provided separately from the crankcase 5 and stores oil A (hereinafter simply referred to as “oil A”).
  • a crankshaft (not shown) is rotatably supported at a connecting portion between the cylinder block 3 and the crankcase 5, and a piston 6 is connected to the crankshaft via a counterweight, a connecting rod connected thereto, and the like.
  • the piston 6 is slidably inserted into a cylinder 3b provided in the cylinder block 3.
  • An intake port and an exhaust port communicating with a carburetor (not shown) and an exhaust muffler (not shown) are provided on the upper wall of the cylinder 3b provided in the cylinder block 3, respectively.
  • An intake valve and an exhaust valve for opening and closing the port are provided.
  • the four-cycle engine 1 of the present embodiment may be used by being carried around, and in that case, the four-cycle engine 1 can be used in a state where it is temporarily rotated and the top and bottom are reversed.
  • the valve operating mechanism 10 for driving these valves is composed of components such as a valve drive gear 10a fixed to a crankshaft, a cam gear 10b driven by the valve drive gear 10a and connected to a cam, and a rocker arm (not shown). Is done.
  • the valve drive gear 10 a and the cam gear 10 b have a valve drive chamber 32 provided in the middle of a supply passage 31 that connects the rocker chamber 4 formed in the head of the cylinder block 3 and the oil tank 7.
  • Components such as a rocker arm are housed in the locker chamber 4.
  • An oil feeding passage 34 is provided between the oil tank 7 and the cylinder block 3.
  • a suction part 35 is attached to the end of the oil feed passage 34 on the oil tank side.
  • the suction portion 35 includes a tube body 35a that is formed of an elastic material such as rubber and can be easily bent, and a weight 35b with a suction port attached to a tip portion of the tube body 35a.
  • the weight 35b of the suction portion 35 is attached so as to be movable in a vertically downward direction by gravity, so that even if the oil tank 7 is tilted, the weight 35b is sucked below the oil level of the oil A stored in a specified amount range.
  • the suction port of the part 35 can be immersed.
  • the oil feed passage 34 sucks up the oil A from the oil tank 7 by connecting the inside of the crank chamber 5a and the oil tank 7 when the inside of the crank chamber 5a tends to become negative pressure due to the piston 6 rising. It is a part supplied in 5a.
  • the position of the opening end 34a that opens to the crank chamber 5a side of the oil feeding passage 34 is a position that opens as the piston 6 moves while the piston 6 moves from the position near the top dead center toward the top dead center. It is provided and is located on the bottom dead center side of the skirt 6a below the piston that has moved to a position near the top dead center. Therefore, the opening end 34a of the oil feeding passage 34 is already fully opened when the piston 6 reaches the top dead center.
  • the oil feed passage 34 is provided with a reed valve at the open end 34a, or provided with a passage on the crankshaft so as to function as a rotary valve.
  • the oil feed passage 34 and the crank chamber 5a can be operated at a negative pressure in the crank chamber 5a. You may make it communicate.
  • a check valve 37 is provided in the middle of the oil feed passage 34.
  • the check valve 37 opens and closes in response to a change in the pressure in the crank chamber 5a, opens in a state where the pressure in the crank chamber 5a is low with respect to the oil tank 7, and connects the oil feed passage 34 to the inside of the crank chamber 5a. It is comprised so that it may close in the state where the pressure of is higher.
  • a communication passage 39 that connects the crank chamber 5 a and the oil tank 7 is provided.
  • the communication passage 39 is for sending oil mist generated in the crank chamber 5a and oil liquefied by the oil mist to the oil tank 7.
  • a reed valve 40 is provided at an open end 39 b that opens to the crank chamber side of the communication passage 39.
  • the reed valve 40 is configured to be openable and closable according to a change in the pressure in the crank chamber 5a, and is opened by the positive pressure in the crank chamber when the piston 6 moves to the bottom dead center side so that the communication passage 39 is in a communicating state. It is configured.
  • the reed valve 40 when the reed valve 40 is opened and the communication passage 39 is in a communication state, the oil mist and oil in the crank chamber 5 a are sent into the oil tank 7 through the communication passage 39.
  • the lower tank space 7b of the oil tank 7 is divided by a baffle plate 7c that also functions as a gasket.
  • An opening 31a of the supply passage 31 is formed at a position in the upper direction of the baffle plate 7c.
  • An opening end 39b on the oil tank side of the communication passage 39 opens at a substantially center in the oil tank 7, and is on the oil level of the oil A stored below a specified amount regardless of the inclined state of the oil tank 7. Placed in position. For this reason, the oil mist discharged from the opening end 39b of the communication passage 39 is blown below the oil surface of the oil, so that the inside of the oil is not bubbled, but is gently returned to the oil tank 7, and much of the oil mist Is liquefied. However, a part of the oil mist discharged from the open end 39b bounces on the oil surface or the wall surface and stays in the upper tank space 7a above the baffle plate 7c in the oil tank 7. Thus, the open end 39b of the communication path 39 disposed at a position on the oil surface of the oil A functions as a part of the liquefying means for liquefying the oil mist.
  • the opening 31a of the supply passage 31 opens at a substantially central portion of the internal space in the oil tank 7, and the position of the oil surface of the oil A stored below a specified amount changes regardless of the inclined state of the oil tank 7. Even so, it is arranged so as not to sink under the oil level. Furthermore, as shown in FIG. 1, it arrange
  • the opening end 39b of the communication passage 39 projects into the oil tank 7 with respect to the opening 31a of the supply passage 31, oil mist discharged from the opening end 39b of the communication passage 39 is provided. Does not directly enter the opening 31 a of the supply passage 31. More preferably, the communication passage 39 and the supply passage 31 may be arranged in a direction away from the adjacent opening end portion as proceeding to each opening end portion side. That is, the opening 31 a of the supply passage 31 and the vicinity thereof are arranged on the base side of the communication passage 39 with respect to a plane orthogonal to the extending direction of the communication passage 39 (direction indicated by the alternate long and short dash line) at the opening end 39 b.
  • the oil mist discharged from the communication passage 39 does not directly enter the opening 31 a of the supply passage 31. That is, the arrangement of the supply passage 31 and the communication passage 39 in the oil tank 7 functions as a supply blocking portion that prevents oil mist discharged from the communication passage 39 from being supplied directly to the opening 31 a of the supply passage 31. . For this reason, the concentration of oil mist flowing through the supply passage 31 is lower than the concentration of oil supplied from the oil feed passage 34 into the crank chamber 5a.
  • the supply passage 31 is connected to the valve drive chamber 32. Further, the locker chamber 4 and the valve drive chamber 32 are communicated with each other by a push rod passage 33. An opening 33 a on the locker chamber 4 side of the push rod passage 33 is open to the cylinder block 3 side of the locker chamber 4. Therefore, the oil mist that has flowed through the supply passage 31 lubricates the valve mechanism 10 in the valve drive chamber 32, is discharged from the opening 33 a of the push rod passage 33, and is supplied into the rocker chamber 4, so that the inside of the rocker chamber 4 Lubricate rocker arms, etc.
  • the push rod passes through the push rod passage 33, and the push rod drives the rocker arm in the rocker chamber 4.
  • a separation wall 45 is formed in the locker chamber 4.
  • a plurality of suction pipes 43 are provided in the locker chamber 4 to suck the accumulated oil.
  • An opening end 43 a of the suction pipe 43 on the side of the locker chamber 4 is open to the cylinder block 3 side of the locker chamber 4.
  • the suction pipe 43 and the suction passage 42 are connected.
  • the suction passage 42 is provided on the opposite side of the locker chamber 4 from the crank chamber 5a, and the suction tube 43 is provided so as to extend to the crank chamber side in the locker chamber 4, and the tip of the suction tube 43 is open. is doing.
  • the tip of the opening of the suction pipe 43 is disposed near the crank chamber side bottom surface of the rocker chamber 4 in order to suck up oil from the crank chamber side bottom surface in the rocker chamber 4.
  • the suction pipe 43 is arranged at the corner of the locker chamber 4, and even if the 4-cycle engine 1 is tilted in a state where the locker chamber 4 is positioned in the upper side position, the locker chamber 4 is interposed via any of the suction pipes 43. The oil that accumulates inside is sucked.
  • a plurality of small holes 44 are provided in the suction passage 42.
  • the small hole 44 is arranged at the corner of the rocker chamber 4 opposite to the crank chamber 5a, and even if the 4-cycle engine 1 is tilted in the inverted state where the rocker chamber 4 is positioned at the lower side position, The oil accumulated in the locker chamber 4 can be sucked through 44.
  • the suction passage 42 is provided with a direct passage 46, and the rocker chamber 4 and the crank chamber 5 a communicate with each other through the direct passage 46 when negative pressure in the crank chamber 5 a is present.
  • the position of the opening end portion 46a on the crank chamber side of the direct passage 46 is the same as that of the opening end portion 34a of the oil feeding passage 34 while the piston 6 moves from the position near the top dead center toward the top dead center. It is provided at a position that opens with the movement of the skirt portion 6a and is located on the bottom dead center side of the skirt portion 6a below the piston that has moved to a position near the top dead center. Therefore, the opening end 46a of the direct passage 46 is already fully opened when the piston 6 reaches the top dead center.
  • the direct passage 46 may be provided with a check valve that allows the flow from the rocker chamber 4 to the crank chamber 5a and restricts the flow from the crank chamber 5a to the rocker chamber 4 side. By doing in this way, it can prevent reliably that oil and oil mist flow back from the crank chamber 5a to the rocker chamber 4.
  • One end portion 48 a of the breather passage 48 is opened at a substantially central portion of the locker chamber 4, and the other end portion of the breather passage 48 is connected to the air cleaner 50.
  • the breather passage 48 is provided for the purpose of discharging blow-by gas mixed in the oil mist to the combustion chamber.
  • the oil mist and blow-by gas in the locker chamber 4 are sent to the air cleaner 50 through the breather passage 48 and are separated into oil and blow-by gas liquefied by an oil separator 51 provided in the air cleaner 50. Since one end portion 48a of the breather passage 48 opens at a substantially central portion of the locker chamber 4, even if a large amount of oil stays in the locker chamber 4, the oil is not easily sucked.
  • the breather passage 48 is provided with a check valve, which prevents the backflow of blow-by gas and oil mist from the air cleaner 50 to the rocker chamber 4 side.
  • the oil that has undergone gas-liquid separation is sent to the crank chamber 5a through a reflux passage 52 that communicates between the air cleaner 50 and the crank chamber 5a.
  • the return passage 52 is provided with a check valve that allows only the flow toward the crank chamber.
  • the blow-by gas separated from the gas and liquid is sent to the combustion chamber.
  • a return passage 54 is provided for returning the oil in the valve drive chamber 32 into the crank chamber 5a.
  • the return passage 54 is configured to be smaller than 1/10 of the cross-sectional area of the communication passage 39.
  • Oil mist and oil in the crank chamber 5a flow through the communication passage 39 having a large cross-sectional area, and the return passage 54 is plugged with oil, so that oil does not flow back from the crank chamber 5a to the valve drive chamber 32. Almost no.
  • the inner diameter of the communication passage 39 is 9 mm, and the inner diameter of the return passage 54 is 2 mm.
  • the return passage 54 may be provided so as to communicate the valve drive chamber 32 and the direct passage 46 described above. By providing the return passage 54 in this way, oil is not supplied to the locker chamber 4 more than necessary. Further, a check valve may be provided in the return passage 54 to allow the oil flow to the crank chamber side and restrict the oil flow to the valve drive chamber 32 side. In this way, the backflow of oil from the crank chamber 5a to the valve drive chamber 32 side can be reliably prevented.
  • a flow rate adjusting passage 56 is provided between the valve drive chamber 32 and the oil feeding passage 34.
  • the flow rate adjusting passage 56 sucks the air in the valve drive chamber 32, whereby the flow rate of oil supplied to the crank chamber 5a via the oil feeding passage 34 is adjusted. If the amount of sucked air is large, the flow rate of oil supplied through the oil feeding passage 34 decreases.
  • the flow rate adjusting passage 56 is preferably separated from the bottom of the valve drive chamber 32 and provided at a position where it is difficult to suck the oil staying in the valve drive chamber 32.
  • connection position of the flow rate adjustment passage 56 to the oil feeding passage 34 is located closer to the oil tank than the check valve 37 provided in the oil feeding passage 34. For this reason, when the oil supply is shut off by the check valve 37, the oil is accumulated in the oil feed passage 34 on the oil tank side of the check valve 37, and the connection portion between the flow rate adjusting passage 56 and the oil feed passage 34 is at the connection portion. Oil has accumulated. Thus, at the timing when the oil feeding passage 34 sucks air from the flow rate adjusting passage 56, only air does not flow through the oil feeding passage 34, and the oil in the oil feeding passage 34 together with the air sent from the valve drive chamber 32. It is sent to the crank chamber 5a.
  • the flow rate adjusting passage 56 is provided with a flow restrictor 57 that adjusts the flow rate of air sent from the valve drive chamber 32 to the oil feeding passage 34.
  • a flow restrictor 57 that adjusts the flow rate of air sent from the valve drive chamber 32 to the oil feeding passage 34.
  • the flow restrictor 57 does not need to be provided separately from the flow adjustment passage 56 and may be configured as a part of the flow adjustment passage 56. For example, if a part of the flow rate adjusting passage 56 is formed along the seal surfaces of the cylinder block 3 and the crankcase 5 and connected to the oil feed passage 34 by the seal surface, the flow restrictor 57 can be easily configured.
  • the oil circulation path of the lubricating device 30 includes an oil feeding passage 34, a communication passage 39, a supply passage 31, a push rod passage 33, a suction pipe 43, a small hole 44, a suction passage 42, a direct passage 46, a breather passage 48, and a reflux passage. 52, a return passage 54, and a flow rate adjustment passage 56.
  • crank chamber 5a When the four-cycle engine 1 is started, a pressure change occurs in the crank chamber 5a due to the up-and-down movement of the piston 6, the crank chamber 5a is depressurized when the piston 6 is raised, and tends to be negative, and the crank chamber is lowered when the piston 6 is lowered. 5a is boosted and tends to be positive.
  • the opening end 34a of the oil feed passage 34 starts to open as the piston 6 moves to near the top dead center, and the crank chamber 5a and the oil tank 7 communicate with each other.
  • the negative pressure in the crank chamber 5a acts on this.
  • the suction portion 35 of the oil feed passage 34 is in a state of being submerged below the oil level of the oil A in the oil tank 7, and the oil A is sucked from the oil tank 7 into the crank chamber 5a.
  • the oil sent into the crank chamber 5a lubricates driving parts such as the piston 6 and the crankshaft, and at the same time, is scattered by these driving parts to become oil mist. Part of the oil mist adheres to the wall surface of the crank chamber 5a and is liquefied again.
  • the crank chamber 5a changes to a positive pressure
  • the reed valve 40 is opened, and the crank chamber 5a and the oil tank 7 communicate with each other.
  • the oil mist and oil whose pressure is increased in the crank chamber 5a are sent to the oil tank 7 through the communication passage 39, and the pressure in the oil tank 7 is increased.
  • the oil mist discharged from the communication passage 39 is liquefied by colliding with the oil surface of the oil A accumulated in the oil tank 7 or the wall surface of the oil tank 7 and stored in the oil tank 7.
  • the concentration of the oil mist remaining by the collision and rebounding in the oil tank 7 is lower than the concentration in the crank chamber 5a.
  • the check valve 37 acts to block the oil feed passage 34 so that oil does not flow back from the crank chamber 5a to the oil tank 7, and the opening end 34a is then closed by the piston 6. It is done.
  • the oil liquefied in the valve drive chamber 32 can be sent to the crank chamber 5a through the return passage 54. For this reason, it is possible to prevent the oil from staying excessively in the valve drive chamber 32 and to prevent the oil from flowing into the locker chamber 4. Further, the oil can be prevented from blocking the supply passage 31.
  • the oil mist supplied to the locker chamber 4 lubricates a valve operating mechanism provided in the locker chamber 4 and is sent to the crank chamber 5 a via the direct passage 46. Further, even if the oil mist supplied in the locker chamber 4 is liquefied and stays, a strong negative pressure in the crank chamber 5a acts and oil can be sent into the crank chamber 5a. It can suppress staying.
  • FIG. 2 is an explanatory view of the oil tank 7 and the vicinity thereof.
  • FIG. 2A is an explanatory diagram of the oil tank 7 of the present embodiment and its vicinity, and
  • FIG. 2B is a comparative example.
  • FIG. 2B as a comparative example, the wall member 101 and the through hole 103 are not provided in the baffle plate 7c.
  • the baffle plate 7c does not have the wall member 101 and the through hole 103, once the oil flows into the upper tank space 7a that is the upper space of the baffle plate 7c, most of the oil is opened to the opening 31a.
  • the oil flowing in the oil circulation path becomes excessive, and as a result, too much oil is discharged into the combustion chamber, which may result in excessive oil consumption. Therefore, in the present embodiment, as shown in FIG. 2A, the wall member 101 and the through hole 103 are provided in the baffle plate 7c.
  • this embodiment described in FIG. 2A will be described in more detail.
  • the oil tank 7 includes an upper tank member 7d, a lower tank member 7e, and a baffle plate 7c.
  • the space above the baffle plate 7c is referred to as the upper tank space 7a.
  • a space below the baffle plate 7c among the internal space of the oil tank 7 formed by the upper tank member 7d and the lower tank member 7e is referred to as a lower tank space 7b.
  • the upper tank member 7d has a shape such that the bottom surface is a rectangular tray.
  • the lower tank member 7e has a square tray shape on the bottom surface.
  • the oil that has flowed through the oil circulation path is returned to the lower tank space 7b from the open end 39b of the communication path 39 (see FIG. 1). Accordingly, when the 4-cycle engine 1 is used in a state where there is no vibration or the like and the lower tank space 7b is positioned vertically downward as shown in FIG. 2A, the oil is stored in the lower tank space 7b. Are not stored, and do not enter the upper tank space 7a. However, when a portable work machine is connected to the 4-cycle engine 1, the lower tank is originally used due to vibration caused by the drive of the 4-cycle engine 1 or use in a state where the 4-cycle engine 1 is tilted. Oil that preferably exists only in the space 7b enters the upper tank space 7a.
  • the opening 31 a of the supply passage 31 is formed near the center of the oil tank 7.
  • the opening 31a since the opening 31a is formed near the center of the oil tank 7, even if the 4-cycle engine 1 is tilted and used (in some cases, it is used with the top and bottom reversed).
  • the opening 31a does not fall below the oil level (submerged (oil submerged)).
  • the opening part 31a is opened to the upper tank space 7a side rather than the baffle plate 7c. Therefore, the oil existing in the lower tank space 7b is not directly sucked from the opening 31a.
  • the opening 31a opens in the direction in which the baffle plate 7c extends (the direction opposite to the opening).
  • FIG. 3 is an explanatory diagram of the wall member 101 and the through hole 103 formed in the baffle plate 7c.
  • 3A is an explanatory diagram of the baffle plate 7c of the present embodiment
  • FIG. 3B is a cross-sectional view of the baffle plate 7c
  • FIG. 3C is a comparative example in the case where the wall member 101 is not provided. is there.
  • a peripheral portion through hole 105 is formed in the baffle plate 7c.
  • a plurality of peripheral through-holes 105 are provided at a position in the back side direction and a position in the front side direction of the baffle plate 7c.
  • Two back side through-holes 105a are formed at the back side direction position of the baffle plate 7c.
  • Four near-side peripheral through holes 105b are formed at positions on the back side of the baffle plate 7c.
  • the peripheral through-hole 105 is used to move oil back and forth through the peripheral through-hole 105 when the work tool connected to the 4-cycle engine 1 is operated at the upper position and when it is operated at the lower position. Is provided.
  • a front side peripheral through hole 105b is provided at a position in the front side direction of the baffle plate 7c so that oil flows back and forth, thereby suppressing excessive consumption of oil.
  • the wall member 101 and the through-hole 103 are positioned in three directions other than the direction in which the oil mist is sucked into the opening portion among the four directions other than the upper side direction and the lower side direction of the opening portion 31a (the position in the rear side direction, the front side) (Position in the side direction, position on the side opposite to the opening).
  • the wall member 101 is formed by notching the baffle plate 7c to a certain length, further notching both sides to the opening 31a side, and pulling the notched portion upward while bending the notched portion. .
  • a through hole 103 is formed in the raised portion.
  • the wall member 101 and the through hole 103 are notched to the baffle plate 7c to a certain length, both sides of the baffle plate 7c are further notched to the opening 31a side, and the notched portions are pulled upward while being bent. Therefore, the wall member 101 and the through hole 103 can be formed by high-speed and simple processing such as press processing.
  • the wall member 101 and the through hole 103 are formed by notching the baffle plate 7c to a certain length, further notching both sides to the opening 31a side, and pulling the notched portion upward while bending. Therefore, a through hole 103 that penetrates the baffle plate 7 c is formed at a position opposite to the opening 31 a of the wall member 101. Even if the oil accumulated on the upper side of the baffle plate 7 c reaches the opening 31 a side, the oil is blocked by the wall member 101 and can be dropped from the through hole 103. Thereby, oil can be more effectively prevented from reaching the opening 31a. In addition, since the through hole 103 is formed in the vicinity of the wall member 101, the oil that has collided with the wall member 101 can be more reliably dropped from the through hole 103.
  • three sets of the wall member 101 and the through hole 103 are provided.
  • the set of the wall member 101 and the through hole 103 is provided in the vicinity of the opening 31a.
  • the set of the wall member 101 and the through hole 103 is provided in the vicinity of the opening 31a, so that the oil is effectively dropped into the lower tank space 7b before reaching the oil around the opening 31a. It becomes possible to make it.
  • oil can be more effectively prevented from reaching the opening 31a.
  • each through-hole 103 is independent.
  • “independent” means that each through hole 103 is not in communication. That is, as shown in FIG. 3A, the inter-wall member portion 107 is provided between each through hole 103.
  • the strength of the inter-wall member portion 107 of the baffle plate 7c surrounded by the set of the plurality of wall members 101 and the through holes 103 is reduced, and the inter-wall member portion 107 is It is possible to prevent bending in the upward direction or the downward direction.
  • oil mist necessary for lubrication is supplied to the oil circulation path from the gap between the wall members 101 formed by the presence of the portion 107 between the wall members through the opening 31a. Note that the amount of oil supplied to the oil circulation path can be easily adjusted to a required amount by changing the size, shape, and the like of the portion 107 between the wall members.
  • the baffle plate 7c has a surface of a sheet metal member 7c-2 coated with an elastic member 7c-1.
  • the baffle plate 7 c also has a gasket function for sealing the oil tank 7.
  • the baffle plate 7c can be made of a member having elasticity as a whole so as to play the role of a gasket. Since it did in this way, it becomes possible to give the function of a gasket to the baffle plate which divides an oil tank into the upper side and the lower side.
  • FIG. 4 shows the positional relationship between the wall member 101 and the through hole 103 as viewed in the lower direction from the upper side position of the set of the plurality of wall members 101 and the through hole 103 described above.
  • a set of wall members 101 and through-holes 103 are formed in three directions so as to surround the opening 31a around the inter-wall member 7f.
  • the inter-wall member 7 f may be surrounded by a set of four or more three wall members 101 and through holes 103.
  • a set of one wall member 101 and a through hole 103 may be provided in front of the opening 31a without forming the inter-wall member 7f.
  • FIG. 6 a configuration in which only the wall member 101 is provided and the through hole 103 is not provided may be employed.
  • FIG. 7 is an explanatory diagram of a modified example of the wall member 101 and the through hole 103 when the wall member 101 has a ceiling member 101a.
  • the opening 31a opens in the direction in which the baffle plate 7c extends, and the wall member 101 does not need to be formed in only three directions so as to surround the opening 31a. That is, you may have the ceiling member 101a which followed the wall member 101 like FIG. Since it has such a configuration, it is possible to prevent the oil scattered by the shaking due to use from being supplied directly to the opening, and to prevent the oil from being supplied to the oil circulation path more than necessary.
  • FIG. 8 is an explanatory diagram of the wall member 101 and the through hole 103 when the wall member 101 is constituted by another member.
  • FIG. 8B is an explanatory diagram of the BB cross section of FIG.
  • the opening 31a may be covered by a separate wall member 109 made of a member different from the baffle plate 7c.
  • the separate wall member 109 includes a separate ceiling portion 109a, a separate wall portion 109b, and a separate joint portion 109c.
  • the separate wall member 109 is fixed to the baffle plate 7c with an adhesive.
  • the separate wall member 109 does not necessarily have the separate ceiling portion 109a, and may include only the separate wall portion 109b.
  • FIG. 9 is an explanatory diagram of a baffle plate provided with a shielding plate 108.
  • the back side peripheral through hole 105a is closed and the number of the front side peripheral through holes 105b is reduced, so that the oil does not easily enter the upper tank space 7a from the lower tank space 7b. Furthermore, by providing the shielding plates 108a and 108b on the back side and the near side of the baffle plate 7c, oil is prevented from scattering toward the opening 31a of the supply passage 31. By providing shielding plates 108a and 108b on the back side and the front side respectively, it is a hand-held work machine that is likely to sway oil on the back side and the front side in the oil tank 7, such as a chainsaw or olive harvester. Further, it is possible to suppress the scattering of oil in the oil tank 7 and to prevent the oil from being supplied to the oil circulation circuit more than necessary.
  • the lubricating device of the four-cycle engine 1 includes an oil tank 7, and the oil tank 7 includes a plate-shaped baffle plate 7c that divides the oil tank into an upper side and a lower side. Yes.
  • An opening 31a of the oil circulation path that supplies and circulates oil mist is disposed in the vicinity of the center of the oil tank 7 and in the upper side position of the baffle plate 7c.
  • the baffle plate 7c has a vicinity of the opening 31a.
  • a wall member 101 extending in the upward direction is formed.
  • the baffle plate 7c that divides the oil tank 7 into the upper side and the lower side is provided in such a configuration, even if the 4-cycle engine 1 is used so as to be swung, the oil accumulated in the lower side of the oil tank Is less likely to scatter and oil is not directly supplied to the opening 31a, and oil can be prevented from being supplied to the oil circulation path more than necessary. Further, since the opening 31a for supplying oil mist to the oil circulation path is formed near the center of the oil tank 7, even if the 4-cycle engine 1 is tilted or the top and bottom are reversed, the opening 31a is located near the center. Makes it difficult for the oil level to reach. As a result, it is possible to prevent oil from being supplied to the oil circulation path more than necessary.
  • the lubricating device for the four-cycle engine 1 can synergistically obtain the above effects, and can effectively prevent oil consumption.
  • a through hole 103 that penetrates the baffle plate 7 c is formed at a position opposite to the opening 31 a of the wall member 101.
  • the through hole 103 is formed in the vicinity of the wall member 101.
  • the lubricating device of the four-cycle engine 1 causes the oil that has turned to the upper side of the baffle plate 7c to drop more reliably from the through hole 103 before the wall member 101, and to circulate oil more than necessary. It is possible to prevent supply to the route.
  • the wall member 101 and the through hole 103 are formed by cutting out and bending the baffle plate 7c. Since it has such a structure, it becomes possible to form the wall member 101 and the through-hole 103 simultaneously, and there exists an effect that manufacture becomes easy.
  • Two or more wall members 101 are formed so as to surround the opening 31a. Since it has such a configuration, there is an effect that the wall member 101 can more effectively prevent oil from reaching the opening 31a.
  • baffle plate 7c By bending the baffle plate 7c, two or more through holes 103 are independently formed. Since it has such a configuration, the baffle plate member (inter-wall member portion 107) remains between the through hole 103 and the through hole 103 connected to the through hole 103, and the strength of the baffle plate 7c. Can be maintained.
  • the ceiling member 101a is formed by further bending the wall member 101 toward the opening 31a. Due to such a configuration, the lubricating device of the four-cycle engine 1 is prevented from supplying oil that has been scattered due to shaking due to use directly to the opening 31a, and is supplied to the oil circulation path more than necessary. It becomes possible to prevent this.
  • the opening 31a opens in the direction in which the baffle plate 7c extends, and the wall member 101 is formed in three directions so as to surround the opening 31a. Since it has such a configuration, the oil that has gone to the upper side of the baffle plate 7c and that is directed toward the opening 31a is more reliably dropped from the through hole 103 and supplied to the oil circulation path more than necessary. Can be prevented
  • the wall member 101 is formed of a member different from the baffle plate 7c. Since it has such a structure, it becomes possible to prevent oil from reaching the opening 31a using the wall member 101 having a more effective shape.
  • the baffle plate 7 c also has a gasket function for sealing the oil tank 7.
  • the baffle plate 7c that divides the oil tank 7 into an upper side and a lower side can also have a gasket function.
  • the oil circulation path of the present invention may be any as long as it circulates for lubrication of a 4-cycle engine.
  • the shape of the through hole may be any shape.
  • independent means that each through hole is not in communication.
  • An example of the wall member of the present invention is the wall member 101 in the embodiment. That is, any shape may be used as long as it has a shape that rises upward. It is not always necessary to have a plate-like shape that does not pass through the oil, and it may be formed of a mesh or the like.
  • the wall member of the present invention does not need to stand only in the upward direction, and may be an inclined and curved shape. Further, the present invention is not limited to the above embodiment, and may have various changed structures and configurations.

Abstract

A lubrication device for a four-stroke engine in which oil is not easily consumed is provided. The lubrication device for the four-stroke engine (1) has an oil tank (7). The oil tank (7) has a plate-shaped baffle plate (7c) which divides the oil tank into an upper side and a lower side. An opening in an oil circulation passage, which supplies and circulates an oil mist, is disposed in a position near the center of the oil tank (7) and in the direction of the upper side of the baffle plate (7c). In the baffle plate (7c), a wall member (101) that extends in the direction of the upper side is formed near the opening (31a).

Description

４サイクルエンジンの潤滑装置4-cycle engine lubrication system
　本発明は、４サイクルエンジンの潤滑装置に関し、さらに詳細には、様々な姿勢で使用してもエンジン内のオイルが消費されにくい４サイクルエンジンの潤滑装置に関する。 The present invention relates to a lubrication device for a four-cycle engine, and more particularly to a lubrication device for a four-cycle engine in which oil in the engine is hardly consumed even when used in various postures.
　環境問題に関する意識の高まりや排ガス規制の強化等により、刈払機や背負式ブロワのような、作業者自身が携帯若しくは背負って作業を行う作業機の駆動エンジンは、２サイクルエンジンから４サイクルエンジンに置き換えられつつある。 Due to increased awareness of environmental issues and stricter exhaust gas regulations, the drive engines for work machines that are carried or carried by workers themselves, such as brush cutters and back blowers, are changed from 2-cycle engines to 4-cycle engines. It is being replaced.
　この４サイクルエンジンは、必要な部品数が２サイクルエンジンと比較して多いため重くなり易く、特に携帯型作業機では、作業者が作業機を携帯しながら作業を行うのが前提となるので、エンジンの軽量化が求められる。 This 4-cycle engine tends to be heavier because it requires more parts than a 2-cycle engine. In particular, in a portable work machine, it is assumed that an operator works while carrying the work machine. The weight reduction of the engine is required.
　そこで、潤滑用のポンプを別に設けることなくクランク室内の圧力変動を利用してオイルを循環させる潤滑装置を備えた４サイクルエンジンが開発されている（特許文献１及び特許文献２参照）。この潤滑装置は、クランク室の底部に設けられたチェック弁を有する。このチェック弁は正圧時に開いて、クランク室内のオイル又はオイルミストがオイルタンク内に送られる。オイルタンク内に設けられた連通管を通ったオイル又はオイルミストはロッカー室及びこれを駆動させる動弁装置に供給されて、充分なオイルがロッカー室や動弁装置に供給される。ロッカー室内に溜まるオイルは、ピストンの上昇移動時にクランク室とロッカー室を連通状態にするクランク室に設けられた連通穴が開口してクランク室に戻される。 Therefore, a four-cycle engine equipped with a lubrication device that circulates oil by utilizing pressure fluctuations in the crank chamber without separately providing a lubrication pump has been developed (see Patent Document 1 and Patent Document 2). This lubricating device has a check valve provided at the bottom of the crank chamber. This check valve opens at the time of positive pressure, and oil or oil mist in the crank chamber is sent into the oil tank. The oil or oil mist that has passed through the communication pipe provided in the oil tank is supplied to the locker chamber and the valve operating device that drives the locker chamber, and sufficient oil is supplied to the locker chamber and the valve operating device. The oil accumulated in the locker chamber is returned to the crank chamber through a communication hole provided in the crank chamber that brings the crank chamber and the locker chamber into communication with each other when the piston moves upward.
　ところで、オイルの潤滑経路にブローバイガスが混入し、潤滑経路中にブローバイガス濃度が高まった状態で、オイルとブローバイガスが混ざり続けると、オイルの劣化が進んで駆動部品の潤滑に悪影響がでる。そこで、一般に、潤滑経路中のブローバイガスを燃焼室に排出し、オイルの早期劣化を防止するような処置が取られ、特許文献１にも記載されているようにエアクリーナを介してロッカー室と燃焼室を連通させる構造がよく用いられている。 By the way, if blowby gas is mixed in the lubrication path of the oil and the concentration of blowby gas is increased in the lubrication path, the oil deteriorates and the lubrication of the drive parts is adversely affected. Therefore, generally, measures are taken to discharge the blow-by gas in the lubrication path to the combustion chamber to prevent early deterioration of the oil, and as described in Patent Document 1, combustion is performed with the rocker chamber via the air cleaner. A structure that communicates the chambers is often used.
特許平０８－２６０９２６号公報Japanese Patent Publication No. 08-260926 特開２００７－２２４８２４号公報JP 2007-224824 A
　一般に、クランク軸周りには高いオイル濃度を必要とし、動弁装置にはクランク軸周りほど高いオイル濃度を必要としない。 Generally, a high oil concentration is required around the crankshaft, and a valve system does not require a higher oil concentration around the crankshaft.
　従来の潤滑装置は、クランク室内の圧力変動を利用してクランク室内のオイル又はオイルミストを濃度調整せずにロッカー室及び動弁装置に送っているので、動弁装置を潤滑するために、ロッカー室へオイル又はオイルミストが過剰に送り込まれ、ロッカー室内に滞留するオイルの量が多くなりすぎて、ブローバイガスの燃焼室への排出と共にオイルが多く排出されてしまい、オイルが早期に消費されてしまうという問題がある。従って、オイルの補充期間が短くなり、オイルの補充を怠ると潤滑不良を起こす原因になる。また燃焼室へのオイルの排出量が更に過剰になると、オイルが未燃焼のまま大量にマフラから外部に排出され、環境へ悪影響を与える虞が生じる。 In the conventional lubrication device, oil or oil mist in the crank chamber is sent to the rocker chamber and the valve operating device without adjusting the concentration by utilizing the pressure fluctuation in the crank chamber. The oil or oil mist is excessively fed into the chamber, the amount of oil staying in the locker chamber increases too much, and a lot of oil is discharged along with the discharge of blow-by gas into the combustion chamber. There is a problem of end. Therefore, the oil replenishment period is shortened, and failure to replenish oil may cause poor lubrication. Further, when the amount of oil discharged into the combustion chamber becomes excessive, a large amount of oil is discharged from the muffler to the outside without being burned, which may adversely affect the environment.
　　本発明は、このような背景に鑑みてなされたものであり、オイルが消費されにくい４サイクルエンジンの潤滑装置を提供することを目的とする。 The present invention has been made in view of such a background, and an object thereof is to provide a lubricating device for a four-cycle engine in which oil is hardly consumed.
　このような課題を解決するため、本発明の４サイクルエンジンの潤滑装置は、オイルタンクを有し、前記オイルタンクは、前記オイルタンクを上側と下側に分割する板形状のバッフルプレートを有し、オイルミストを供給し、循環するオイル循環経路の開口部が、前記オイルタンクの中心付近、かつ、前記バッフルプレートの上側方向位置に配置され、前記バッフルプレートには、前記開口部の近傍に上側方向に延びる壁部材が形成されている（請求項１）。 In order to solve such a problem, the lubricating device for a four-cycle engine of the present invention has an oil tank, and the oil tank has a plate-shaped baffle plate that divides the oil tank into an upper side and a lower side. , An oil circulation path opening for supplying and circulating oil mist is disposed near the center of the oil tank and at an upper side position of the baffle plate, and the baffle plate has an upper side near the opening. A wall member extending in the direction is formed (claim 1).
　このような構成、特にオイルタンクを上側及び下側に分割するバッフルプレートを有することから、たとえ４サイクルエンジンが振り回されるように使用されても、オイルタンクの下側に溜まっているオイルが飛散しにくく、開口部に直接オイルが供給されにくく、オイルが必要以上にオイル循環経路に供給されることを防ぐことが可能となる。
　また、オイルタンクの中心付近にオイル循環経路にオイルミストを供給する開口部が形成されていることによって、４サイクルエンジンが傾く、又は、天地が逆転する等しても、中心付近にはオイルの油面が到達することが困難となる。その結果、オイルが必要以上にオイル循環経路に供給されることを防ぐことが可能となる。
　さらに、バッフルプレートには、開口部の近傍に上側方向に延びる壁部材が形成されていることから、バッフルプレートの上側に回ったオイルが、必要以上にオイル循環経路に供給されることを防ぐことが可能となる。
　本発明の４サイクルエンジンの潤滑装置は、以上の効果を相乗的に得ることが可能となり、オイルが消費されにくい４サイクルエンジンを提供することが可能となる。 Since it has a baffle plate that divides the oil tank into an upper side and a lower side in such a configuration, even if the 4-cycle engine is used so as to be swung, the oil accumulated in the lower side of the oil tank is scattered. It is difficult to supply oil directly to the opening, and it is possible to prevent oil from being supplied to the oil circulation path more than necessary.
In addition, since an opening for supplying oil mist to the oil circulation path is formed near the center of the oil tank, even if the 4-cycle engine is tilted or the top and bottom is reversed, the oil is located near the center. It becomes difficult for the oil level to reach. As a result, it is possible to prevent oil from being supplied to the oil circulation path more than necessary.
Further, since the baffle plate is formed with a wall member extending in the upward direction in the vicinity of the opening portion, it is possible to prevent the oil that has turned to the upper side of the baffle plate from being supplied to the oil circulation path more than necessary. Is possible.
The lubrication device for a 4-cycle engine of the present invention can synergistically obtain the above effects, and can provide a 4-cycle engine in which oil is hardly consumed.
　前記壁部材の前記開口部とは反対側位置に前記バッフルプレートを貫通する貫通穴が形成されている（請求項２）。 A through hole penetrating the baffle plate is formed at a position opposite to the opening of the wall member (Claim 2).
　このような構成を有することから、本発明における４サイクルエンジンの潤滑装置は、バッフルプレートの上側に回ったオイルが、開口部に到達する前に貫通穴から落下し、必要以上にオイル循環経路に供給されることを防ぐことが可能となる。 With such a configuration, the lubricating device for a four-cycle engine in the present invention is such that the oil that has turned to the upper side of the baffle plate falls from the through hole before reaching the opening, and is more than necessary in the oil circulation path. It is possible to prevent the supply.
　前記貫通穴は、前記壁部材の近傍に形成されている（請求項３）。 The through hole is formed in the vicinity of the wall member (Claim 3).
　このような構成を有することから、本発明における４サイクルエンジンの潤滑装置は、バッフルプレートの上側に回ったオイルが、壁部材の手前でより確実に貫通穴から落下させ、必要以上にオイル循環経路に供給されることを防ぐことが可能となる。 With this configuration, the lubricating device for a four-cycle engine according to the present invention causes the oil that has turned to the upper side of the baffle plate to fall more reliably from the through hole before the wall member, and the oil circulation path is more than necessary. Can be prevented from being supplied.
　前記壁部材及び前記貫通穴は、前記バッフルプレートを切り欠いてかつ折り曲げることによって形成されている（請求項４）。 The wall member and the through hole are formed by cutting out and bending the baffle plate (claim 4).
　このような構成を有することから、壁部材と貫通穴を同時に形成することが可能となり、製造が簡便となるという効果がある。 Since it has such a configuration, it is possible to form the wall member and the through hole at the same time, and there is an effect that the manufacturing becomes simple.
　前記壁部材は、前記開口部を取り囲むようにそれぞれ２つ以上形成されている（請求項５）。 Two or more wall members are formed so as to surround the opening (Claim 5).
　このような構成を有することから、壁部材によって、オイルが開口部に到達することをより効果的に防ぐことができるという効果がある。 Since it has such a configuration, there is an effect that the wall member can more effectively prevent the oil from reaching the opening.
　前記バッフルプレートを折り曲げる事により、２つ以上の前記貫通穴が、独立に形成されている（請求項６）。 The two or more through holes are independently formed by bending the baffle plate (Claim 6).
　このような構成を有することから、貫通穴とその貫通穴に連説される貫通穴との間に、バッフルプレート部材が残ることとなり、バッフルプレートの強度を保つことが可能となる。 Since it has such a configuration, the baffle plate member remains between the through hole and the through hole connected to the through hole, and the strength of the baffle plate can be maintained.
　前記壁部材を前記開口部の側に更に折り曲げることで天井部材が形成されていることを特徴とする（請求項７）。 The ceiling member is formed by further bending the wall member toward the opening (claim 7).
　このような構成を有することから、本発明における４サイクルエンジンの潤滑装置は、使用による揺れにより飛散したオイルが、開口部に直接供給されることが防止され、必要以上にオイル循環経路に供給されることを防ぐことが可能となる。 With such a configuration, the lubricating device for a four-cycle engine according to the present invention prevents the oil scattered due to shaking due to use from being supplied directly to the opening, and is supplied to the oil circulation path more than necessary. Can be prevented.
　前記開口部は前記バッフルプレートが伸びている方向を向いて開口しており、
　前記壁部材は、前記開口部を囲むように３方向の位置に形成される（請求項８）。 The opening is open in the direction in which the baffle plate extends,
The wall member is formed at a position in three directions so as to surround the opening.
　このような構成を有することから、バッフルプレートの上側に回ったオイルのうち開口部に向かうオイルをより確実に貫通穴から落下させて、必要以上にオイル循環経路に供給されることを防ぐことが可能となる Because of having such a configuration, it is possible to more reliably drop the oil that goes to the opening of the baffle plate toward the opening from the through hole and prevent it from being supplied to the oil circulation path more than necessary. Possible
　前記壁部材は、前記バッフルプレートとは別の部材によって形成されている（請求項９）。 The wall member is formed of a member different from the baffle plate (claim 9).
　このような構成を有することから、より効果的な形状を有する壁部材を用いて、オイルが開口部へ到達することを防ぐことが可能となる。 Since it has such a configuration, it is possible to prevent the oil from reaching the opening by using a wall member having a more effective shape.
　前記バッフルプレートは、前記オイルタンクを密封するガスケットの機能をも有する（請求項１０）。 The baffle plate also has a gasket function for sealing the oil tank (claim 10).
　このような構成を有することから、オイルタンクを上側と下側に分けるバッフルプレートに、ガスケットの機能をも持たせることが可能となる。 Since it has such a configuration, the baffle plate that divides the oil tank into an upper side and a lower side can also have a gasket function.
　本発明における４サイクルエンジンの潤滑装置によって、オイルが消費されにくい４サイクルエンジンの潤滑装置を提供することが可能となる。 The 4-cycle engine lubrication device according to the present invention can provide a 4-cycle engine lubrication device in which oil is hardly consumed.
本発明の第１の実施形態に係わる４サイクルエンジンの潤滑装置の概略説明図である。It is a schematic explanatory drawing of the lubrication apparatus of the 4-cycle engine concerning the 1st Embodiment of this invention. オイルタンク及びその近傍の説明図であるIt is explanatory drawing of an oil tank and its vicinity. バッフルプレートに形成される壁部材及び貫通穴の説明図である。It is explanatory drawing of the wall member and through-hole which are formed in a baffle plate. 壁部材及び貫通穴の変形例の説明図である。It is explanatory drawing of the modification of a wall member and a through-hole. 壁部材及び貫通穴の変形例の説明図である。It is explanatory drawing of the modification of a wall member and a through-hole. 壁部材及び貫通穴の変形例の説明図である。It is explanatory drawing of the modification of a wall member and a through-hole. 壁部材が天井部材を有する場合の壁部材及び貫通穴の変形例の説明図である。It is explanatory drawing of the modification of a wall member and a through-hole in case a wall member has a ceiling member. 別部材によって壁部材が構成される場合の壁部材及び貫通穴の説明図である。It is explanatory drawing of a wall member and a through-hole in case a wall member is comprised by another member. 遮蔽板を備えたバッフルプレートの変形例の説明図である。It is explanatory drawing of the modification of the baffle plate provided with the shielding board.
　まず、方向について定義を行う。本実施形態において上側方向とは、４サイクルエンジン１が使用されていない保管時等における位置関係での上側方向をいう（図２において、紙面上側）。
　この上側方向は使用状態において４サイクルエンジン１が最も長く使用される状態における鉛直上側方向と略一致する。この上側方向とは反対方向を下側方向という（図２において、紙面下側）。
　また、開口部３１ａによってオイルミストが吸入される方向を開口部側方向と定義する（図２において、紙面左上方向）。この開口部側方向と反対の方向を反開口部側方向という（図２において、紙面右下方向）。
　さらにまた、開口部３１ａを正面にした時に、右手方向を奥側方向（図２において、紙面右上方向）と定義する。この奥側方向と反対側の方向を手前側方向（図２において、紙面左下方向）と定義する。 First, the direction is defined. In the present embodiment, the upper direction refers to the upper direction in a positional relationship during storage or the like where the 4-cycle engine 1 is not used (upper side in FIG. 2).
This upper direction substantially coincides with the vertical upper direction in the state where the four-cycle engine 1 is used for the longest in the use state. The direction opposite to the upper direction is referred to as the lower direction (the lower side in FIG. 2).
Further, the direction in which the oil mist is sucked by the opening 31a is defined as the opening side direction (upper left direction in FIG. 2). The direction opposite to the opening side direction is referred to as the counter-opening side direction (the lower right side in FIG. 2).
Furthermore, when the opening 31a is front, the right hand direction is defined as the back side direction (upper right direction in FIG. 2). The direction opposite to the rear side direction is defined as the front side direction (the lower left direction in FIG. 2).
　以下、本発明の４サイクルエンジンの潤滑装置の好ましい実施の形態を図１～図４に基づいて説明する。潤滑装置は４サイクルエンジンに搭載されるものであるので、この潤滑装置を搭載した４サイクルエンジンについて図１（概略説明図）を用いて説明する。
　なお、図１は、ピストンが上死点に位置した状態にあるときの４サイクルエンジンを示している。 A preferred embodiment of a lubricating device for a four-cycle engine according to the present invention will be described below with reference to FIGS. Since the lubrication apparatus is mounted on a 4-cycle engine, a 4-cycle engine equipped with the lubrication apparatus will be described with reference to FIG.
FIG. 1 shows a four-cycle engine when the piston is located at the top dead center.
　４サイクルエンジン１は、図１に示すように、シリンダヘッド３ａが一体化されているシリンダブロック３と、シリンダブロック３の下部に取り付けられてクランク室５ａを形成するクランクケース５と、クランクケース５の下側方向位置に配設されたオイルタンク７とを備える。
　オイルタンク７は、クランクケース５と別個に設けられ、オイルＡ（以下、単に「オイルＡ」と記す。）を貯留する。 As shown in FIG. 1, the four-cycle engine 1 includes a cylinder block 3 in which a cylinder head 3 a is integrated, a crankcase 5 attached to a lower portion of the cylinder block 3 to form a crank chamber 5 a, and a crankcase 5 And an oil tank 7 disposed at a lower side position.
The oil tank 7 is provided separately from the crankcase 5 and stores oil A (hereinafter simply referred to as “oil A”).
　シリンダブロック３とクランクケース５との接続部分には、クランク軸（図示せず）が回転自在に支持され、このクランク軸にはカウンタウェイトやこれに連結されたコンロッド等を介してピストン６が連接されている。ピストン６はシリンダブロック３内に設けられたシリンダ３ｂ内に摺動自在に挿入されている。 A crankshaft (not shown) is rotatably supported at a connecting portion between the cylinder block 3 and the crankcase 5, and a piston 6 is connected to the crankshaft via a counterweight, a connecting rod connected thereto, and the like. Has been. The piston 6 is slidably inserted into a cylinder 3b provided in the cylinder block 3.
　シリンダブロック３内に設けられたシリンダ３ｂの上壁には、気化器（図示せず）及び排気マフラ（図示せず）にそれぞれ連通する吸気ポート及び排気ポートが設けられ、これらの各ポートには、ポートを開閉する吸気バルブ及び排気バルブが配設されている。 An intake port and an exhaust port communicating with a carburetor (not shown) and an exhaust muffler (not shown) are provided on the upper wall of the cylinder 3b provided in the cylinder block 3, respectively. An intake valve and an exhaust valve for opening and closing the port are provided.
　ここで、本実施形態の４サイクルエンジン１は、携帯して用いられる場合もあり、その際には４サイクルエンジン１は一時的に回転して天地が逆転した状態等で使用されうる。 Here, the four-cycle engine 1 of the present embodiment may be used by being carried around, and in that case, the four-cycle engine 1 can be used in a state where it is temporarily rotated and the top and bottom are reversed.
　これらのバルブを駆動する動弁機構１０は、クランク軸に固着されたバルブ駆動ギヤ１０ａ、バルブ駆動ギヤ１０ａによって駆動されカムが連接されたカムギヤ１０ｂ、ロッカーアーム（図示せず）等の部品により構成される。
　この動弁機構１０のうちバルブ駆動ギヤ１０ａ及びカムギヤ１０ｂは、シリンダブロック３の頭部に形成されたロッカー室４とオイルタンク７とを連通する供給通路３１の途中に設けられたバルブ駆動室３２内に収容され、ロッカーアーム等の部品は、ロッカー室４内に設けられている。 The valve operating mechanism 10 for driving these valves is composed of components such as a valve drive gear 10a fixed to a crankshaft, a cam gear 10b driven by the valve drive gear 10a and connected to a cam, and a rocker arm (not shown). Is done.
Among the valve operating mechanism 10, the valve drive gear 10 a and the cam gear 10 b have a valve drive chamber 32 provided in the middle of a supply passage 31 that connects the rocker chamber 4 formed in the head of the cylinder block 3 and the oil tank 7. Components such as a rocker arm are housed in the locker chamber 4.
　オイルタンク７とシリンダブロック３との間には、送油通路３４が設けられている。送油通路３４のオイルタンク側の端部には、吸入部３５が取り付けられている。
　吸入部３５は、ゴム等の弾性材料により形成されて容易に撓むことができる管体３５ａと、管体３５ａの先端部に取り付けられた吸入口付きの錘３５ｂとを有してなる。
　吸入部３５の錘３５ｂは、重力により鉛直下側方向位置に移動可能に取り付けられており、これによりオイルタンク７が傾いても、規定量の範囲で貯留されるオイルＡの油面下に吸入部３５の吸入口を没入させることができる。 An oil feeding passage 34 is provided between the oil tank 7 and the cylinder block 3. A suction part 35 is attached to the end of the oil feed passage 34 on the oil tank side.
The suction portion 35 includes a tube body 35a that is formed of an elastic material such as rubber and can be easily bent, and a weight 35b with a suction port attached to a tip portion of the tube body 35a.
The weight 35b of the suction portion 35 is attached so as to be movable in a vertically downward direction by gravity, so that even if the oil tank 7 is tilted, the weight 35b is sucked below the oil level of the oil A stored in a specified amount range. The suction port of the part 35 can be immersed.
　送油通路３４は、ピストン６の上昇によりクランク室５ａ内が負圧化傾向となったときに、クランク室５ａ内とオイルタンク７とを連通させてオイルタンク７からオイルＡを吸い上げてクランク室５ａ内に供給する部分である。
　送油通路３４のクランク室５ａ側に開口する開口端部３４ａの位置は、ピストン６が上死点近傍位置から上死点に向かって移動する間にピストン６の移動に伴って開口する位置に設けられ、上死点近傍位置に移動したピストン下部のスカート部６ａの下死点方向側に位置している。
　従って、送油通路３４の開口端部３４ａは、ピストン６が上死点に達した時点では既に全開している。 The oil feed passage 34 sucks up the oil A from the oil tank 7 by connecting the inside of the crank chamber 5a and the oil tank 7 when the inside of the crank chamber 5a tends to become negative pressure due to the piston 6 rising. It is a part supplied in 5a.
The position of the opening end 34a that opens to the crank chamber 5a side of the oil feeding passage 34 is a position that opens as the piston 6 moves while the piston 6 moves from the position near the top dead center toward the top dead center. It is provided and is located on the bottom dead center side of the skirt 6a below the piston that has moved to a position near the top dead center.
Therefore, the opening end 34a of the oil feeding passage 34 is already fully opened when the piston 6 reaches the top dead center.
　なお、送油通路３４は、開口端部３４ａにリード弁を設け、又は、クランク軸に通路を設けてロータリバルブとして機能させる等、クランク室５ａ内の負圧時に送油通路３４とクランク室５ａを連通させるようにしてもよい。 The oil feed passage 34 is provided with a reed valve at the open end 34a, or provided with a passage on the crankshaft so as to function as a rotary valve. For example, the oil feed passage 34 and the crank chamber 5a can be operated at a negative pressure in the crank chamber 5a. You may make it communicate.
　送油通路３４の途中には、逆止弁３７が設けられている。この逆止弁３７は、クランク室５ａの圧力変化に応じて開閉し、オイルタンク７内に対しクランク室５ａ内の圧力が低い状態で開いて送油通路３４を連通状態にし、クランク室５ａ内の圧力の方が高い状態で閉じるように構成されている。 A check valve 37 is provided in the middle of the oil feed passage 34. The check valve 37 opens and closes in response to a change in the pressure in the crank chamber 5a, opens in a state where the pressure in the crank chamber 5a is low with respect to the oil tank 7, and connects the oil feed passage 34 to the inside of the crank chamber 5a. It is comprised so that it may close in the state where the pressure of is higher.
　クランク室５ａの底部とオイルタンク７との間には、クランク室５ａとオイルタンク７を連通する連通路３９が設けられている。この連通路３９は、クランク室５ａ内で生成されたオイルミスト及び、このオイルミストが液化したオイルをオイルタンク７に送るためのものである。
　連通路３９のクランク室側に開口する開口端部３９ｂにはリード弁４０が設けられている。このリード弁４０は、クランク室５ａの圧力変化に応じて開閉可能に構成され、ピストン６が下死点側に移動するときのクランク室内の正圧によって開いて連通路３９を連通状態にするように構成されている。
　このためリード弁４０が開いて連通路３９が連通状態になると、クランク室５ａ内のオイルミスト及びオイルが連通路３９を通ってオイルタンク７内に送られる。
　オイルタンク７の下側タンク空間７ｂは、ガスケットとしての機能をも有するバッフルプレート７ｃによって区分けされている。
　バッフルプレート７ｃの上側方向位置に、供給通路３１の開口部３１ａが形成されている。 Between the bottom of the crank chamber 5 a and the oil tank 7, a communication passage 39 that connects the crank chamber 5 a and the oil tank 7 is provided. The communication passage 39 is for sending oil mist generated in the crank chamber 5a and oil liquefied by the oil mist to the oil tank 7.
A reed valve 40 is provided at an open end 39 b that opens to the crank chamber side of the communication passage 39. The reed valve 40 is configured to be openable and closable according to a change in the pressure in the crank chamber 5a, and is opened by the positive pressure in the crank chamber when the piston 6 moves to the bottom dead center side so that the communication passage 39 is in a communicating state. It is configured.
Therefore, when the reed valve 40 is opened and the communication passage 39 is in a communication state, the oil mist and oil in the crank chamber 5 a are sent into the oil tank 7 through the communication passage 39.
The lower tank space 7b of the oil tank 7 is divided by a baffle plate 7c that also functions as a gasket.
An opening 31a of the supply passage 31 is formed at a position in the upper direction of the baffle plate 7c.
　連通路３９のオイルタンク側の開口端部３９ｂは、オイルタンク７内の略中央で開口し、オイルタンク７の傾斜状態に拘わらず、規定量以下で貯留されたオイルＡの油面上となる位置に配置されている。
　このため、連通路３９の開口端部３９ｂから吐出するオイルミストは、オイルの油面下に吹きつけられることでオイル内部を泡立てることはなく、穏やかにオイルタンク７に戻され、オイルミストの多くが液化される。
　但し、開口端部３９ｂから吐出するオイルミストの一部は油面上や壁面上で跳ね返って、オイルタンク７内のバッフルプレート７ｃよりも上側の上側タンク空間７ａ内に滞留する。このようにオイルＡの油面上の位置に配置された連通路３９の開口端部３９ｂは、オイルミストを液化させる液化手段の一部として機能する。 An opening end 39b on the oil tank side of the communication passage 39 opens at a substantially center in the oil tank 7, and is on the oil level of the oil A stored below a specified amount regardless of the inclined state of the oil tank 7. Placed in position.
For this reason, the oil mist discharged from the opening end 39b of the communication passage 39 is blown below the oil surface of the oil, so that the inside of the oil is not bubbled, but is gently returned to the oil tank 7, and much of the oil mist Is liquefied.
However, a part of the oil mist discharged from the open end 39b bounces on the oil surface or the wall surface and stays in the upper tank space 7a above the baffle plate 7c in the oil tank 7. Thus, the open end 39b of the communication path 39 disposed at a position on the oil surface of the oil A functions as a part of the liquefying means for liquefying the oil mist.
　従って、連通路３９から吐出するオイルミストはその大部分が液化され、オイルタンク７内に貯留するオイルミストの濃度を低くすることができる。 Therefore, most of the oil mist discharged from the communication passage 39 is liquefied, and the concentration of the oil mist stored in the oil tank 7 can be lowered.
　供給通路３１の開口部３１ａは、オイルタンク７内の内部空間の略中央部で開口し、オイルタンク７の傾斜状態に拘わらず、規定量以下で貯留されたオイルＡの油面の位置が変化しても油面下に没することがないように配置されている。さらに、図１に示すように、開口部３１ａに対して開口端部３９ｂが突出するように配置している。 The opening 31a of the supply passage 31 opens at a substantially central portion of the internal space in the oil tank 7, and the position of the oil surface of the oil A stored below a specified amount changes regardless of the inclined state of the oil tank 7. Even so, it is arranged so as not to sink under the oil level. Furthermore, as shown in FIG. 1, it arrange | positions so that the opening edge part 39b may protrude with respect to the opening part 31a.
　このように、供給通路３１の開口部３１ａに対し連通路３９の開口端部３９ｂがオイルタンク７内に突出するように配置されているので、連通路３９の開口端部３９ｂから吐出するオイルミストが供給通路３１の開口部３１ａに直接に入ることはない。さらに好ましくは連通路３９と供給通路３１は、各開口端部側に進むに従って隣接する開口端部と離れる方向に配置されてもよい。
　即ち、開口端部３９ｂにおける連通路３９の延伸方向（一点鎖線で示した方向）に直交する平面に対し、供給通路３１の開口部３１ａ及びその近傍が連通路３９の基部側に配置されていれば、連通路３９から吐出するオイルミストが直接に供給通路３１の開口部３１ａに入ることはない。
　つまりオイルタンク７における供給通路３１と連通路３９の配置は、連通路３９から吐出するオイルミストが直接に供給通路３１の開口部３１ａに供給されるのを阻止する供給阻止部として機能している。
　このため、供給通路３１を流れるオイルミストの濃度は、送油通路３４からクランク室５ａ内に供給されるオイルの濃度と比較して低くなる。 Thus, since the opening end 39b of the communication passage 39 projects into the oil tank 7 with respect to the opening 31a of the supply passage 31, oil mist discharged from the opening end 39b of the communication passage 39 is provided. Does not directly enter the opening 31 a of the supply passage 31. More preferably, the communication passage 39 and the supply passage 31 may be arranged in a direction away from the adjacent opening end portion as proceeding to each opening end portion side.
That is, the opening 31 a of the supply passage 31 and the vicinity thereof are arranged on the base side of the communication passage 39 with respect to a plane orthogonal to the extending direction of the communication passage 39 (direction indicated by the alternate long and short dash line) at the opening end 39 b. For example, the oil mist discharged from the communication passage 39 does not directly enter the opening 31 a of the supply passage 31.
That is, the arrangement of the supply passage 31 and the communication passage 39 in the oil tank 7 functions as a supply blocking portion that prevents oil mist discharged from the communication passage 39 from being supplied directly to the opening 31 a of the supply passage 31. .
For this reason, the concentration of oil mist flowing through the supply passage 31 is lower than the concentration of oil supplied from the oil feed passage 34 into the crank chamber 5a.
　供給通路３１は、バルブ駆動室３２に接続されている。
　また、ロッカー室４とバルブ駆動室３２とがプッシュロッド通路３３によって連通されている。
　プッシュロッド通路３３のロッカー室４側の開口部３３ａは、ロッカー室４のシリンダブロック３側に開口している。このため、供給通路３１を流れたオイルミストはバルブ駆動室３２内の動弁機構１０を潤滑し、プッシュロッド通路３３の開口部３３ａから吐出してロッカー室４内に供給されてロッカー室４内のロッカーアーム等を潤滑する。
　このプッシュロッド通路３３をプッシュロッドが貫通して、プッシュロッドがロッカー室４内のロッカーアームを駆動している。
　また、ロッカー室４内には、分離壁４５が形成されている。 The supply passage 31 is connected to the valve drive chamber 32.
Further, the locker chamber 4 and the valve drive chamber 32 are communicated with each other by a push rod passage 33.
An opening 33 a on the locker chamber 4 side of the push rod passage 33 is open to the cylinder block 3 side of the locker chamber 4. Therefore, the oil mist that has flowed through the supply passage 31 lubricates the valve mechanism 10 in the valve drive chamber 32, is discharged from the opening 33 a of the push rod passage 33, and is supplied into the rocker chamber 4, so that the inside of the rocker chamber 4 Lubricate rocker arms, etc.
The push rod passes through the push rod passage 33, and the push rod drives the rocker arm in the rocker chamber 4.
A separation wall 45 is formed in the locker chamber 4.
　ロッカー室４内には、溜まったオイルを吸引するために吸引管４３が複数設けられている。
　吸引管４３のロッカー室４側の開口端部４３ａは、ロッカー室４のシリンダブロック３側に開口している。
　そして、吸引管４３と吸引通路４２が接続されている。吸引通路４２はロッカー室４のクランク室５ａとは反対側に設けられ、吸引管４３はこれに連通してロッカー室４内のクランク室側へ延びるように設けられ、吸引管４３の先端は開口している。
　吸引管４３の開口先端部は、ロッカー室４内のクランク室側底面からオイルを吸い上げるために、ロッカー室４のクランク室側底面の近傍位置に配置されている。
　そして、吸引管４３はロッカー室４の隅部に配置されて、ロッカー室４が上側方向位置に位置する状態で４サイクルエンジン１が傾いても、いずれかの吸引管４３を介してロッカー室４内に溜まるオイルが吸引されるようになっている。 A plurality of suction pipes 43 are provided in the locker chamber 4 to suck the accumulated oil.
An opening end 43 a of the suction pipe 43 on the side of the locker chamber 4 is open to the cylinder block 3 side of the locker chamber 4.
The suction pipe 43 and the suction passage 42 are connected. The suction passage 42 is provided on the opposite side of the locker chamber 4 from the crank chamber 5a, and the suction tube 43 is provided so as to extend to the crank chamber side in the locker chamber 4, and the tip of the suction tube 43 is open. is doing.
The tip of the opening of the suction pipe 43 is disposed near the crank chamber side bottom surface of the rocker chamber 4 in order to suck up oil from the crank chamber side bottom surface in the rocker chamber 4.
The suction pipe 43 is arranged at the corner of the locker chamber 4, and even if the 4-cycle engine 1 is tilted in a state where the locker chamber 4 is positioned in the upper side position, the locker chamber 4 is interposed via any of the suction pipes 43. The oil that accumulates inside is sucked.
　また吸引通路４２には小穴４４が複数設けられている。この小穴４４は、ロッカー室４のクランク室５ａとは反対側の隅部に配置され、ロッカー室４が下側方向位置に位置する反転状態で４サイクルエンジン１が傾いても、いずれかの小穴４４を介してロッカー室４内に溜まるオイルを吸引できる。 Further, a plurality of small holes 44 are provided in the suction passage 42. The small hole 44 is arranged at the corner of the rocker chamber 4 opposite to the crank chamber 5a, and even if the 4-cycle engine 1 is tilted in the inverted state where the rocker chamber 4 is positioned at the lower side position, The oil accumulated in the locker chamber 4 can be sucked through 44.
　吸引通路４２には直通通路４６が設けられ、クランク室５ａ内の負圧時に、ロッカー室４とクランク室５ａとが直通通路４６を介して連通する。
　直通通路４６のクランク室側の開口端部４６ａの位置は、送油通路３４の開口端部３４ａと同様に、ピストン６が上死点近傍位置から上死点に向かって移動する間にピストン６の移動に伴って開口する位置に設けられ、上死点近傍位置に移動したピストン下部のスカート部６ａの下死点方向側に位置している。
　従って、直通通路４６の開口端部４６ａは、ピストン６が上死点に達した時点では既に全開している。 The suction passage 42 is provided with a direct passage 46, and the rocker chamber 4 and the crank chamber 5 a communicate with each other through the direct passage 46 when negative pressure in the crank chamber 5 a is present.
The position of the opening end portion 46a on the crank chamber side of the direct passage 46 is the same as that of the opening end portion 34a of the oil feeding passage 34 while the piston 6 moves from the position near the top dead center toward the top dead center. It is provided at a position that opens with the movement of the skirt portion 6a and is located on the bottom dead center side of the skirt portion 6a below the piston that has moved to a position near the top dead center.
Therefore, the opening end 46a of the direct passage 46 is already fully opened when the piston 6 reaches the top dead center.
　また直通通路４６に、ロッカー室４からクランク室５ａ側への流れを許容し、クランク室５ａからロッカー室４側への流れを規制する逆止弁を設けてもよい。
　このようにすることで、クランク室５ａからロッカー室４へオイルやオイルミストが逆流することを確実に防止することができる。 The direct passage 46 may be provided with a check valve that allows the flow from the rocker chamber 4 to the crank chamber 5a and restricts the flow from the crank chamber 5a to the rocker chamber 4 side.
By doing in this way, it can prevent reliably that oil and oil mist flow back from the crank chamber 5a to the rocker chamber 4.
　ロッカー室４の略中央部にはブリーザ通路４８の一端部４８ａが開口し、ブリーザ通路４８の他端部がエアクリーナ５０に接続されている。
　ブリーザ通路４８は、オイルミストに混入するブローバイガスを燃焼室へ排出することを目的として設けられている。ロッカー室４内のオイルミストやブローバイガスは、ブリーザ通路４８を介してエアクリーナ５０に送られ、エアクリーナ５０に設けられたオイルセパレータ５１により液化されたオイルとブローバイガスに気液分離される。
　ブリーザ通路４８の一端部４８ａは、ロッカー室４の略中央部に開口するので、ロッカー室４にオイルが多く滞留しても、容易にそのオイルを吸い込むことはない。このブリーザ通路４８には逆止弁が設けられ、この逆止弁によりエアクリーナ５０からロッカー室４側へのブローバイガスやオイルミストの逆流を防止している。 One end portion 48 a of the breather passage 48 is opened at a substantially central portion of the locker chamber 4, and the other end portion of the breather passage 48 is connected to the air cleaner 50.
The breather passage 48 is provided for the purpose of discharging blow-by gas mixed in the oil mist to the combustion chamber. The oil mist and blow-by gas in the locker chamber 4 are sent to the air cleaner 50 through the breather passage 48 and are separated into oil and blow-by gas liquefied by an oil separator 51 provided in the air cleaner 50.
Since one end portion 48a of the breather passage 48 opens at a substantially central portion of the locker chamber 4, even if a large amount of oil stays in the locker chamber 4, the oil is not easily sucked. The breather passage 48 is provided with a check valve, which prevents the backflow of blow-by gas and oil mist from the air cleaner 50 to the rocker chamber 4 side.
　気液分離されたオイルは、エアクリーナ５０とクランク室５ａを連通する還流通路５２を通ってクランク室５ａに送られる。還流通路５２にはクランク室側への流れのみを許容する逆止弁が設けられている。一方、気液分離されたブローバイガスは燃焼室に送られる。 The oil that has undergone gas-liquid separation is sent to the crank chamber 5a through a reflux passage 52 that communicates between the air cleaner 50 and the crank chamber 5a. The return passage 52 is provided with a check valve that allows only the flow toward the crank chamber. On the other hand, the blow-by gas separated from the gas and liquid is sent to the combustion chamber.
　バルブ駆動室３２のオイルタンク側の底部とクランク室５ａの間には、バルブ駆動室３２内のオイルをクランク室５ａ内に戻すための戻し通路５４が設けられている。クランク室５ａの負圧時には、戻し通路５４を介してバルブ駆動室３２に溜まるオイルが吸引される。この戻し通路５４は、連通路３９の断面積の１／１０よりも小さく構成されている。
　クランク室５ａの正圧時には、リード弁４０が開き、クランク室５ａとオイルタンク７が連通状態になる。クランク室５ａ内のオイルミストとオイルは断面積の大きな連通路３９を流れ、戻し通路５４はオイルで栓がされた状態になるので、クランク室５ａからバルブ駆動室３２へオイルが逆流することは殆どない。本実施形態では、連通路３９の内径をφ９ｍｍ、戻し通路５４の内径をφ２ｍｍとしている。 Between the bottom of the valve drive chamber 32 on the oil tank side and the crank chamber 5a, a return passage 54 is provided for returning the oil in the valve drive chamber 32 into the crank chamber 5a. When the crank chamber 5a has a negative pressure, the oil accumulated in the valve drive chamber 32 is sucked through the return passage 54. The return passage 54 is configured to be smaller than 1/10 of the cross-sectional area of the communication passage 39.
When the crank chamber 5a has a positive pressure, the reed valve 40 is opened, and the crank chamber 5a and the oil tank 7 are in communication with each other. Oil mist and oil in the crank chamber 5a flow through the communication passage 39 having a large cross-sectional area, and the return passage 54 is plugged with oil, so that oil does not flow back from the crank chamber 5a to the valve drive chamber 32. Almost no. In the present embodiment, the inner diameter of the communication passage 39 is 9 mm, and the inner diameter of the return passage 54 is 2 mm.
　なお、戻し通路５４は、バルブ駆動室３２と前述した直通通路４６とを連通するように設けてもよい。このように戻し通路５４を設けることで、ロッカー室４に必要以上にオイルが供給されることはない。
　また、戻し通路５４内に、クランク室側へのオイルの流れを許容し、バルブ駆動室３２側へのオイルの流れを規制する逆止弁を設けてもよい。このようにすると、クランク室５ａ内からバルブ駆動室３２側へのオイルの逆流を確実に防止することができる。 The return passage 54 may be provided so as to communicate the valve drive chamber 32 and the direct passage 46 described above. By providing the return passage 54 in this way, oil is not supplied to the locker chamber 4 more than necessary.
Further, a check valve may be provided in the return passage 54 to allow the oil flow to the crank chamber side and restrict the oil flow to the valve drive chamber 32 side. In this way, the backflow of oil from the crank chamber 5a to the valve drive chamber 32 side can be reliably prevented.
　またバルブ駆動室３２と送油通路３４との間には、流量調整通路５６が設けられている。
　流量調整通路５６がバルブ駆動室３２内の空気を吸い込むことで、送油通路３４を介してクランク室５ａに供給されるオイルの流量が調整される。
　この空気の吸い込み量が多ければ、送油通路３４を介して供給されるオイルの流量は減少する。なお、流量調整通路５６は、バルブ駆動室３２の底部から離し、バルブ駆動室３２に滞留するオイルを吸い込みにくい位置に設けるのが良い。 A flow rate adjusting passage 56 is provided between the valve drive chamber 32 and the oil feeding passage 34.
The flow rate adjusting passage 56 sucks the air in the valve drive chamber 32, whereby the flow rate of oil supplied to the crank chamber 5a via the oil feeding passage 34 is adjusted.
If the amount of sucked air is large, the flow rate of oil supplied through the oil feeding passage 34 decreases. The flow rate adjusting passage 56 is preferably separated from the bottom of the valve drive chamber 32 and provided at a position where it is difficult to suck the oil staying in the valve drive chamber 32.
　流量調整通路５６の送油通路３４への接続位置は、送油通路３４に設けられた逆止弁３７よりもオイルタンク側に位置している。
　このため、逆止弁３７によりオイルの供給を遮断すると、逆止弁３７よりもオイルタンク側の送油通路３４内にはオイルが溜まり、流量調整通路５６と送油通路３４の接続部位にはオイルが溜まった状態になる。
　これによって、流量調整通路５６から送油通路３４が空気を吸い込むタイミングで、空気だけが送油通路３４を流れることはなく、バルブ駆動室３２から送り込まれた空気とともに送油通路３４内のオイルがクランク室５ａに送られる。 The connection position of the flow rate adjustment passage 56 to the oil feeding passage 34 is located closer to the oil tank than the check valve 37 provided in the oil feeding passage 34.
For this reason, when the oil supply is shut off by the check valve 37, the oil is accumulated in the oil feed passage 34 on the oil tank side of the check valve 37, and the connection portion between the flow rate adjusting passage 56 and the oil feed passage 34 is at the connection portion. Oil has accumulated.
Thus, at the timing when the oil feeding passage 34 sucks air from the flow rate adjusting passage 56, only air does not flow through the oil feeding passage 34, and the oil in the oil feeding passage 34 together with the air sent from the valve drive chamber 32. It is sent to the crank chamber 5a.
　この流量調整通路５６には、バルブ駆動室３２から送油通路３４に送られる空気の流量を調整する流量絞り５７が設けられている。
　流量絞り５７を調整してバルブ駆動室３２から吸い込まれる空気の量を調整することで、送油通路３４を介してクランク室５ａに供給されるオイルの流量を調整することができる。つまり、流量調整通路５６の内径を気にせず、流量絞り５７の設計のみで容易にオイルの流量調整ができる。 The flow rate adjusting passage 56 is provided with a flow restrictor 57 that adjusts the flow rate of air sent from the valve drive chamber 32 to the oil feeding passage 34.
By adjusting the flow rate restrictor 57 and adjusting the amount of air sucked from the valve drive chamber 32, the flow rate of oil supplied to the crank chamber 5a via the oil feed passage 34 can be adjusted. That is, the flow rate of oil can be easily adjusted only by designing the flow restrictor 57 without worrying about the inner diameter of the flow rate adjusting passage 56.
　なお、流量絞り５７は、流量調整通路５６と別体に設ける必要はなく、流量調整通路５６の一部として構成されてもよい。例えば、シリンダブロック３とクランクケース５のシール面に沿って流量調整通路５６の一部を形成し、シール面で送油通路３４と接続すると、流量絞り５７を容易に構成することができる。 The flow restrictor 57 does not need to be provided separately from the flow adjustment passage 56 and may be configured as a part of the flow adjustment passage 56. For example, if a part of the flow rate adjusting passage 56 is formed along the seal surfaces of the cylinder block 3 and the crankcase 5 and connected to the oil feed passage 34 by the seal surface, the flow restrictor 57 can be easily configured.
　つまり、潤滑装置３０のオイル循環経路は、送油通路３４、連通路３９、供給通路３１、プッシュロッド通路３３、吸引管４３、小穴４４、吸引通路４２、直通通路４６、ブリーザ通路４８、還流通路５２、戻し通路５４、流量調整通路５６を有して構成されている。 That is, the oil circulation path of the lubricating device 30 includes an oil feeding passage 34, a communication passage 39, a supply passage 31, a push rod passage 33, a suction pipe 43, a small hole 44, a suction passage 42, a direct passage 46, a breather passage 48, and a reflux passage. 52, a return passage 54, and a flow rate adjustment passage 56.
　４サイクルエンジン１が始動されると、ピストン６の昇降運動によりクランク室５ａに圧力変化が生じ、ピストン６の上昇時にはクランク室５ａが減圧されて負圧化傾向となり、ピストン６の下降時にはクランク室５ａが昇圧されて正圧化傾向となる。 When the four-cycle engine 1 is started, a pressure change occurs in the crank chamber 5a due to the up-and-down movement of the piston 6, the crank chamber 5a is depressurized when the piston 6 is raised, and tends to be negative, and the crank chamber is lowered when the piston 6 is lowered. 5a is boosted and tends to be positive.
　クランク室５ａが負圧化傾向となり、ピストン６の上死点近傍への移動に伴い送油通路３４の開口端部３４ａが開き始め、クランク室５ａとオイルタンク７が連通すると、送油通路３４にクランク室５ａ内の負圧が作用する。
　４サイクルエンジン１が傾いても送油通路３４の吸入部３５は、オイルタンク７のオイルＡの油面下に没した状態にあり、オイルタンク７からオイルＡが吸い込まれてクランク室５ａ内に送られる。開口端部３４ａは、ピストン６が上死点位置に達した時点では既に全開となっているので、クランク室５ａ内の負圧を充分に送油通路３４に作用させることができる。
　そのため、油面下より汲み上げられるオイルＡをクランク室５ａ内に充分に供給することができる。 When the crank chamber 5a tends to have a negative pressure, the opening end 34a of the oil feed passage 34 starts to open as the piston 6 moves to near the top dead center, and the crank chamber 5a and the oil tank 7 communicate with each other. The negative pressure in the crank chamber 5a acts on this.
Even when the 4-cycle engine 1 is tilted, the suction portion 35 of the oil feed passage 34 is in a state of being submerged below the oil level of the oil A in the oil tank 7, and the oil A is sucked from the oil tank 7 into the crank chamber 5a. Sent. Since the open end 34a is already fully opened when the piston 6 reaches the top dead center position, the negative pressure in the crank chamber 5a can be sufficiently applied to the oil feed passage 34.
Therefore, the oil A pumped from below the oil level can be sufficiently supplied into the crank chamber 5a.
　クランク室５ａ内に送られたオイルは、ピストン６，クランクシャフトなどの駆動部品を潤滑し、同時にそれらの駆動部品により飛散されてオイルミストになる。オイルミストの一部はクランク室５ａの壁面に付着して再度液化される。 The oil sent into the crank chamber 5a lubricates driving parts such as the piston 6 and the crankshaft, and at the same time, is scattered by these driving parts to become oil mist. Part of the oil mist adheres to the wall surface of the crank chamber 5a and is liquefied again.
　ピストン６が上死点から下降するときには、クランク室５ａが正圧に変わり、リード弁４０は開放されて、クランク室５ａとオイルタンク７は連通する。そして、クランク室５ａ内で昇圧されたオイルミスト及びオイルが連通路３９を通ってオイルタンク７に送られ、オイルタンク７内の圧力が高まる。連通路３９から吐出するオイルミストはオイルタンク７内に溜まるオイルＡの油面やオイルタンク７の壁面に衝突することで液化し、オイルタンク７に貯留される。
　オイルタンク７内で衝突して跳ね返ることで残ったオイルミストの濃度は、クランク室５ａ内での濃度よりも低くなる。
　なお、クランク室５ａが正圧になると、逆止弁３７の作用によりクランク室５ａからオイルタンク７へのオイルが逆流しないよう送油通路３４が遮断され、次いで開口端部３４ａがピストン６により閉じられる。 When the piston 6 descends from the top dead center, the crank chamber 5a changes to a positive pressure, the reed valve 40 is opened, and the crank chamber 5a and the oil tank 7 communicate with each other. Then, the oil mist and oil whose pressure is increased in the crank chamber 5a are sent to the oil tank 7 through the communication passage 39, and the pressure in the oil tank 7 is increased. The oil mist discharged from the communication passage 39 is liquefied by colliding with the oil surface of the oil A accumulated in the oil tank 7 or the wall surface of the oil tank 7 and stored in the oil tank 7.
The concentration of the oil mist remaining by the collision and rebounding in the oil tank 7 is lower than the concentration in the crank chamber 5a.
When the crank chamber 5a becomes positive pressure, the check valve 37 acts to block the oil feed passage 34 so that oil does not flow back from the crank chamber 5a to the oil tank 7, and the opening end 34a is then closed by the piston 6. It is done.
　オイルタンク７内の圧力が高まることで、オイルタンク７内とロッカー室４の間に圧力勾配ができ、オイルタンク７内に溜まるオイルミストは、供給通路３１を介してロッカー室４に送られる。
　オイルタンク７からロッカー室４にオイルミストを送る過程で、供給通路３１に設けられたバルブ駆動室３２内の動弁機構１０の各部品は潤滑される。この際オイルミストの一部は液化する。 By increasing the pressure in the oil tank 7, a pressure gradient is created between the oil tank 7 and the locker chamber 4, and the oil mist accumulated in the oil tank 7 is sent to the locker chamber 4 via the supply passage 31.
In the process of sending oil mist from the oil tank 7 to the locker chamber 4, each component of the valve mechanism 10 in the valve drive chamber 32 provided in the supply passage 31 is lubricated. At this time, part of the oil mist is liquefied.
　バルブ駆動室３２で液化されてなったオイルは、戻し通路５４を介してクランク室５ａに送ることができる。
　このため、バルブ駆動室３２でオイルが過度に滞留することを抑止でき、ロッカー室４にオイルが流出することを抑止できる。またオイルが供給通路３１を塞ぐ事を防止できる。 The oil liquefied in the valve drive chamber 32 can be sent to the crank chamber 5a through the return passage 54.
For this reason, it is possible to prevent the oil from staying excessively in the valve drive chamber 32 and to prevent the oil from flowing into the locker chamber 4. Further, the oil can be prevented from blocking the supply passage 31.
　ロッカー室４に供給されたオイルミストは、ロッカー室４内に設けられた動弁機構を潤滑し、直通通路４６を介してクランク室５ａに送られる。
　またロッカー室４内に供給されたオイルミストが液化して滞留してもクランク室５ａ内の強い負圧が作用して、クランク室５ａ内にオイルを送ることができ、ロッカー室４でオイルが滞留することを抑止できる。 The oil mist supplied to the locker chamber 4 lubricates a valve operating mechanism provided in the locker chamber 4 and is sent to the crank chamber 5 a via the direct passage 46.
Further, even if the oil mist supplied in the locker chamber 4 is liquefied and stays, a strong negative pressure in the crank chamber 5a acts and oil can be sent into the crank chamber 5a. It can suppress staying.
　従って、ロッカー室４からブリーザ通路４８を介してブローバイガスを排出する際のオイルの放出を抑えることができる。 Therefore, it is possible to suppress oil release when the blow-by gas is discharged from the locker chamber 4 through the breather passage 48.
　図２は、オイルタンク７及びその近傍の説明図である。
　図２（ａ）は、本実施形態のオイルタンク７及びその近傍の説明図であり、図２（ｂ）は、比較例である。 FIG. 2 is an explanatory view of the oil tank 7 and the vicinity thereof.
FIG. 2A is an explanatory diagram of the oil tank 7 of the present embodiment and its vicinity, and FIG. 2B is a comparative example.
　比較例である図２（ｂ）では、バッフルプレート７ｃには壁部材１０１及び貫通穴１０３が設けられていない。
　このように、バッフルプレート７ｃに、壁部材１０１及び貫通穴１０３がないと、バッフルプレート７ｃの上側空間である上側タンク空間７ａにオイルが一度流入してしまうとそのオイルの大部分が開口部３１ａから吸い込まれてしまいオイル循環経路中を流れるオイルが過剰となり、その結果、燃焼室に排出されるオイルが多くなりすぎ、オイルの消費量が過剰となってしまうというおそれがある。
　そこで、本実施形態では図２（ａ）のように、バッフルプレート７ｃに、壁部材１０１及び貫通穴１０３を設けている。
　以下、図２（ａ）に記載した本実施形態をより詳細に説明する。 In FIG. 2B as a comparative example, the wall member 101 and the through hole 103 are not provided in the baffle plate 7c.
As described above, if the baffle plate 7c does not have the wall member 101 and the through hole 103, once the oil flows into the upper tank space 7a that is the upper space of the baffle plate 7c, most of the oil is opened to the opening 31a. As a result, the oil flowing in the oil circulation path becomes excessive, and as a result, too much oil is discharged into the combustion chamber, which may result in excessive oil consumption.
Therefore, in the present embodiment, as shown in FIG. 2A, the wall member 101 and the through hole 103 are provided in the baffle plate 7c.
Hereinafter, this embodiment described in FIG. 2A will be described in more detail.
　図２（ａ）のように、オイルタンク７は、上側タンク部材７ｄ、下側タンク部材７ｅ及びバッフルプレート７ｃによって構成されている。
　そして、上側タンク部材７ｄ及び下側タンク部材７ｅによって形成されるオイルタンク７の内部空間のうち、バッフルプレート７ｃよりも上側の空間を上側タンク空間７ａという。同様に、上側タンク部材７ｄ及び下側タンク部材７ｅによって形成されるオイルタンク７の内部空間のうち、バッフルプレート７ｃよりも下側の空間を下側タンク空間７ｂという。
　上側タンク部材７ｄは底面が四角形のお盆形状を伏せたような形状をしている。
　また、下側タンク部材７ｅは底面が四角形のお盆形状をしている。
　ここで、オイル循環経路中を流れてきたオイルは、連通路３９の開口端部３９ｂから下側タンク空間７ｂ内に戻される（図１参照）。
　したがって、４サイクルエンジン１に、振動等がなく、図２（ａ）のように下側タンク空間７ｂが鉛直下方向に位置する状態で使用される場合には、オイルは下側タンク空間７ｂ内に全て貯蔵され、上側タンク空間７ａに侵入することはない。
　しかし、４サイクルエンジン１に携帯型作業機を接続して使用する際、４サイクルエンジン１の駆動に伴う振動、又は、４サイクルエンジン１が傾いた状態等での使用によって、本来は下側タンク空間７ｂ内にのみ存在することが望ましいオイルが上側タンク空間７ａに侵入してしまう。
　この上側タンク空間７ａに侵入したオイルは、図２（ｂ）のように壁部材１０１及び貫通穴１０３が設けられていなければ大部分が開口部３１ａから吸い込まれてしまうが、本実施形態では、図２（ａ）のように壁部材１０１及び貫通穴１０３が存在するため、開口部３１ａに吸い込まれる前に下側タンク空間７ｂに戻される。
　したがって、オイルの過剰消費を防止することが可能となる。 As shown in FIG. 2A, the oil tank 7 includes an upper tank member 7d, a lower tank member 7e, and a baffle plate 7c.
Of the internal space of the oil tank 7 formed by the upper tank member 7d and the lower tank member 7e, the space above the baffle plate 7c is referred to as the upper tank space 7a. Similarly, a space below the baffle plate 7c among the internal space of the oil tank 7 formed by the upper tank member 7d and the lower tank member 7e is referred to as a lower tank space 7b.
The upper tank member 7d has a shape such that the bottom surface is a rectangular tray.
The lower tank member 7e has a square tray shape on the bottom surface.
Here, the oil that has flowed through the oil circulation path is returned to the lower tank space 7b from the open end 39b of the communication path 39 (see FIG. 1).
Accordingly, when the 4-cycle engine 1 is used in a state where there is no vibration or the like and the lower tank space 7b is positioned vertically downward as shown in FIG. 2A, the oil is stored in the lower tank space 7b. Are not stored, and do not enter the upper tank space 7a.
However, when a portable work machine is connected to the 4-cycle engine 1, the lower tank is originally used due to vibration caused by the drive of the 4-cycle engine 1 or use in a state where the 4-cycle engine 1 is tilted. Oil that preferably exists only in the space 7b enters the upper tank space 7a.
Most of the oil that has entered the upper tank space 7a is sucked from the opening 31a unless the wall member 101 and the through hole 103 are provided as shown in FIG. 2B. Since the wall member 101 and the through hole 103 exist as shown in FIG. 2A, the wall member 101 and the through hole 103 are returned to the lower tank space 7b before being sucked into the opening 31a.
Therefore, it is possible to prevent excessive consumption of oil.
　また、図２（ａ）のように、供給通路３１の開口部３１ａは、オイルタンク７の中心付近に形成される。
　このように、開口部３１ａをオイルタンク７の中心付近に形成したことから、たとえ、４サイクルエンジン１が傾いて使用されていても（場合によっては天地が逆転した状態で使用されていても）、開口部３１ａがオイルの油面の下（水没（油没）状態）になることはない。
　また、開口部３１ａは、バッフルプレート７ｃよりも上側タンク空間７ａ側に開口している。したがって、下側タンク空間７ｂに存在するオイルが直接に開口部３１ａから吸入されることはない。
　さらにまた、開口部３１ａはバッフルプレート７ｃが伸びている方向（反開口部側方向）を向いて開口している。 As shown in FIG. 2A, the opening 31 a of the supply passage 31 is formed near the center of the oil tank 7.
As described above, since the opening 31a is formed near the center of the oil tank 7, even if the 4-cycle engine 1 is tilted and used (in some cases, it is used with the top and bottom reversed). The opening 31a does not fall below the oil level (submerged (oil submerged)).
Moreover, the opening part 31a is opened to the upper tank space 7a side rather than the baffle plate 7c. Therefore, the oil existing in the lower tank space 7b is not directly sucked from the opening 31a.
Furthermore, the opening 31a opens in the direction in which the baffle plate 7c extends (the direction opposite to the opening).
　図３は、バッフルプレート７ｃに形成される壁部材１０１及び貫通穴１０３の説明図である。図３（ａ）は本実施形態のバッフルプレート７ｃの説明図であり、図３（ｂ）はバッフルプレート７ｃの断面図であり、図３（ｃ）は壁部材１０１がない場合の比較例である。 FIG. 3 is an explanatory diagram of the wall member 101 and the through hole 103 formed in the baffle plate 7c. 3A is an explanatory diagram of the baffle plate 7c of the present embodiment, FIG. 3B is a cross-sectional view of the baffle plate 7c, and FIG. 3C is a comparative example in the case where the wall member 101 is not provided. is there.
　図３（ａ）のように、バッフルプレート７ｃには、周辺部貫通穴１０５が形成されている。この周辺部貫通穴１０５は、バッフルプレート７ｃの奥側方向位置と手前側方向位置にそれぞれ複数個数設けられている。
　バッフルプレート７ｃの奥側方向位置には、２つの奥側貫通穴１０５ａが形成されている。
　バッフルプレート７ｃの奥側方向位置には、４つの手前側周辺貫通穴１０５ｂが形成されている。
　この周辺部貫通穴１０５は、４サイクルエンジン１に接続される作業工具が上側位置で作業した場合、及び、下側位置で作業した場合にこの周辺部貫通穴１０５を通ってオイルを行き来させるために設けられている。
　それに対して、図３（ｃ）のような比較例では、手前側周辺貫通穴１０５ｂが形成されていないため、バッフルプレート７ｃの上側に溜まったオイルは、開口部３１ａに吸い込まれやすくなってしまう。
　つまり、手前側周辺貫通穴１０５ｂ側が下がっている状態から手前側周辺貫通穴１０５ｂ側が下がっていない状態に戻った場合に、バッフルプレート７ｃの上側に溜まったオイルは手前側周辺貫通穴１０５ｂがないため、この手前側周辺貫通穴１０５ｂを通って下側タンク空間７ｂに戻ることができない。その結果、このバッフルプレート７ｃの上側に溜まったオイルの多くが開口部３１ａから吸い込まれてしまう。
　このようなことがないように、本実施形態では、バッフルプレート７ｃの手前側方向位置に手前側周辺貫通穴１０５ｂを設けて、オイルを行き来させ、オイルの過剰消費を抑えている。 As shown in FIG. 3A, a peripheral portion through hole 105 is formed in the baffle plate 7c. A plurality of peripheral through-holes 105 are provided at a position in the back side direction and a position in the front side direction of the baffle plate 7c.
Two back side through-holes 105a are formed at the back side direction position of the baffle plate 7c.
Four near-side peripheral through holes 105b are formed at positions on the back side of the baffle plate 7c.
The peripheral through-hole 105 is used to move oil back and forth through the peripheral through-hole 105 when the work tool connected to the 4-cycle engine 1 is operated at the upper position and when it is operated at the lower position. Is provided.
On the other hand, in the comparative example as shown in FIG. 3C, since the front peripheral through hole 105b is not formed, the oil accumulated on the upper side of the baffle plate 7c is likely to be sucked into the opening 31a. .
That is, when the front peripheral through-hole 105b side is lowered and the front peripheral through-hole 105b side returns to a state where the front peripheral through-hole 105b is not lowered, the oil accumulated on the upper side of the baffle plate 7c does not have the front peripheral through-hole 105b. It is not possible to return to the lower tank space 7b through the front peripheral through hole 105b. As a result, much of the oil accumulated on the upper side of the baffle plate 7c is sucked from the opening 31a.
In order to prevent such a situation, in the present embodiment, a front side peripheral through hole 105b is provided at a position in the front side direction of the baffle plate 7c so that oil flows back and forth, thereby suppressing excessive consumption of oil.
　壁部材１０１及び貫通穴１０３は、開口部３１ａの上側方向及び下側方向以外の４方向のうち前記開口部にオイルミストが吸入される方向以外の３方向の位置（奥側方向の位置、手前側方向の位置、反開口部側位置）に形成されている。
　壁部材１０１は、バッフルプレート７ｃを一定の長さに切り欠き、その両サイドを開口部３１ａの側にさらに切り欠き、その切り欠いた部分を曲げながら上側方向に引きあげることによって形成されている。その結果、引き上げられた部分に貫通穴１０３ができる。
　このように、壁部材１０１及び貫通穴１０３は、バッフルプレート７ｃを一定の長さに切り欠き、その両サイドを開口部３１ａの側にさらに切り欠き、切り欠いた部分を曲げながら上側方向に引きあげることによって形成されていることから、プレス加工等の高速、簡易な加工で壁部材１０１及び貫通穴１０３を作成することが可能となっている。 The wall member 101 and the through-hole 103 are positioned in three directions other than the direction in which the oil mist is sucked into the opening portion among the four directions other than the upper side direction and the lower side direction of the opening portion 31a (the position in the rear side direction, the front side) (Position in the side direction, position on the side opposite to the opening).
The wall member 101 is formed by notching the baffle plate 7c to a certain length, further notching both sides to the opening 31a side, and pulling the notched portion upward while bending the notched portion. . As a result, a through hole 103 is formed in the raised portion.
As described above, the wall member 101 and the through hole 103 are notched to the baffle plate 7c to a certain length, both sides of the baffle plate 7c are further notched to the opening 31a side, and the notched portions are pulled upward while being bent. Therefore, the wall member 101 and the through hole 103 can be formed by high-speed and simple processing such as press processing.
　壁部材１０１及び貫通穴１０３は、バッフルプレート７ｃを一定の長さに切り欠き、その両サイドを開口部３１ａの側にさらに切り欠き、切り欠いた部分を曲げながら上側方向に引きあげることによって形成されていることから、壁部材１０１の開口部３１ａとは反対側位置にバッフルプレート７ｃを貫通する貫通穴１０３が形成されている。
　バッフルプレート７ｃの上側に溜まったオイルが開口部３１ａ側に到達しても、壁部材１０１によってオイルが遮られ、貫通穴１０３から落下させることができる。それによって、オイルが開口部３１ａに到達することをより効果的に防ぐことができる。
　また、貫通穴１０３は壁部材１０１の近傍に形成されていることになるので、壁部材１０１に衝突したオイルを、より確実に、貫通穴１０３から落下させることが可能となる。 The wall member 101 and the through hole 103 are formed by notching the baffle plate 7c to a certain length, further notching both sides to the opening 31a side, and pulling the notched portion upward while bending. Therefore, a through hole 103 that penetrates the baffle plate 7 c is formed at a position opposite to the opening 31 a of the wall member 101.
Even if the oil accumulated on the upper side of the baffle plate 7 c reaches the opening 31 a side, the oil is blocked by the wall member 101 and can be dropped from the through hole 103. Thereby, oil can be more effectively prevented from reaching the opening 31a.
In addition, since the through hole 103 is formed in the vicinity of the wall member 101, the oil that has collided with the wall member 101 can be more reliably dropped from the through hole 103.
　この実施形態では、壁部材１０１及び貫通穴１０３のセットは３個設けられていることとなる。
　また、壁部材１０１及び貫通穴１０３のセットは、開口部３１ａの近傍に設けられることとなる。このように、壁部材１０１及び貫通穴１０３のセットが開口部３１ａの近傍に設けられることによって、効果的に、開口部３１ａのまわりにオイル到達する前に、下側タンク空間７ｂにオイルを落下させることが可能となる。
　また、開口部３１ａを取り囲むように複数の壁部材１０１及び貫通穴１０３のセットが設けられていることによって、オイルが開口部３１ａに到達することをより効果的に防ぐことができる。 In this embodiment, three sets of the wall member 101 and the through hole 103 are provided.
The set of the wall member 101 and the through hole 103 is provided in the vicinity of the opening 31a. As described above, the set of the wall member 101 and the through hole 103 is provided in the vicinity of the opening 31a, so that the oil is effectively dropped into the lower tank space 7b before reaching the oil around the opening 31a. It becomes possible to make it.
In addition, by providing a set of the plurality of wall members 101 and the through holes 103 so as to surround the opening 31a, oil can be more effectively prevented from reaching the opening 31a.
　複数の壁部材１０１及び貫通穴１０３のセットを設ける場合には、それぞれの貫通穴１０３は独立している。ここで独立とは、それぞれの貫通穴１０３が連通していいないことをいう。つまり、図３（ａ）のように、それぞれの貫通穴１０３との間に壁部材間部分１０７を有する。
　このように、壁部材間部分１０７を有することによって、複数の壁部材１０１及び貫通穴１０３のセットに囲まれるバッフルプレート７ｃの壁部材間部分１０７の強度が低下して、壁部材間部分１０７が上側方向又は下側方向に折れ曲がることを防ぐことができる。
　また、この壁部材間部分１０７があることによって形成される壁部材１０１間の隙間からオイル循環経路へ潤滑に必要なオイルミストが開口部３１ａを介して供給される。
　なお、壁部材間部分１０７の大きさ、形状等を変化させることによって、オイル循環経路に供給されるオイルの量を必要な量に調整することも容易に行える。 When providing the set of the some wall member 101 and the through-hole 103, each through-hole 103 is independent. Here, “independent” means that each through hole 103 is not in communication. That is, as shown in FIG. 3A, the inter-wall member portion 107 is provided between each through hole 103.
Thus, by having the inter-wall member portion 107, the strength of the inter-wall member portion 107 of the baffle plate 7c surrounded by the set of the plurality of wall members 101 and the through holes 103 is reduced, and the inter-wall member portion 107 is It is possible to prevent bending in the upward direction or the downward direction.
Also, oil mist necessary for lubrication is supplied to the oil circulation path from the gap between the wall members 101 formed by the presence of the portion 107 between the wall members through the opening 31a.
Note that the amount of oil supplied to the oil circulation path can be easily adjusted to a required amount by changing the size, shape, and the like of the portion 107 between the wall members.
　図３（ｂ）に示すように、バッフルプレート７ｃは、板金部材７ｃ－２の表面に弾性部材７ｃ－１がコーティングされている。そして、これによってバッフルプレート７ｃは、オイルタンク７を密封するガスケットの機能をも有する。
　なお、バッフルプレート７ｃを全体が弾性を有する部材から構成してガスケットの役割を果たさせることも可能である。
　このようにしたことから、オイルタンクを上側と下側に分けるバッフルプレートに、ガスケットの機能をも持たせることが可能となる。 As shown in FIG. 3B, the baffle plate 7c has a surface of a sheet metal member 7c-2 coated with an elastic member 7c-1. Thus, the baffle plate 7 c also has a gasket function for sealing the oil tank 7.
The baffle plate 7c can be made of a member having elasticity as a whole so as to play the role of a gasket.
Since it did in this way, it becomes possible to give the function of a gasket to the baffle plate which divides an oil tank into the upper side and the lower side.
　図４、図５、図６は、壁部材１０１及び貫通穴１０３の変形例の説明図である。 4, 5, and 6 are explanatory diagrams of modified examples of the wall member 101 and the through hole 103.
　図４は、上記した複数の壁部材１０１及び貫通穴１０３のセットの上側方向位置から、下側方向を見た壁部材１０１及び貫通穴１０３の位置関係である。
　図４のように、壁間部材７ｆの周囲には、開口部３１ａを囲むように３方向に壁部材１０１及び貫通穴１０３のセットがそれぞれ形成されている。
　もっとも、壁間部材７ｆを取り囲むのは、３個の壁部材１０１及び貫通穴１０３のセットである必要性はない、例えば、図５（ａ）のように、２個のセットであってよい。もしくは、４個以上の３個の壁部材１０１及び貫通穴１０３のセットによって壁間部材７ｆを取り囲んでいてもよい。
　さらに、場合によっては、図５（ｂ）のように、壁間部材７ｆを作らずに開口部３１ａの直近の真正面に１個の壁部材１０１及び貫通穴１０３のセットを設けてもよい。 FIG. 4 shows the positional relationship between the wall member 101 and the through hole 103 as viewed in the lower direction from the upper side position of the set of the plurality of wall members 101 and the through hole 103 described above.
As shown in FIG. 4, a set of wall members 101 and through-holes 103 are formed in three directions so as to surround the opening 31a around the inter-wall member 7f.
However, it is not necessary to surround the inter-wall member 7f with a set of the three wall members 101 and the through hole 103. For example, as shown in FIG. Alternatively, the inter-wall member 7 f may be surrounded by a set of four or more three wall members 101 and through holes 103.
Furthermore, depending on the case, as shown in FIG. 5B, a set of one wall member 101 and a through hole 103 may be provided in front of the opening 31a without forming the inter-wall member 7f.
　さらに、図６のように、壁部材１０１のみを設けて、貫通穴１０３を設けない構成であってもよい。 Furthermore, as shown in FIG. 6, a configuration in which only the wall member 101 is provided and the through hole 103 is not provided may be employed.
　図７は、壁部材１０１が天井部材１０１ａを有する場合の壁部材１０１及び貫通穴１０３の変形例の説明図である。 FIG. 7 is an explanatory diagram of a modified example of the wall member 101 and the through hole 103 when the wall member 101 has a ceiling member 101a.
　開口部３１ａはバッフルプレート７ｃが伸びている方向を向いて開口しており、壁部材１０１は、開口部３１ａを囲むように３方向のみに形成される必要はない。
　つまり、図７のように、壁部材１０１に連続した天井部材１０１ａを有していてもよい。
　このような構成を有することから、使用による揺れにより飛散したオイルが、開口部に直接供給されることが防止され、必要以上にオイル循環経路に供給されることを防ぐことが可能となる。 The opening 31a opens in the direction in which the baffle plate 7c extends, and the wall member 101 does not need to be formed in only three directions so as to surround the opening 31a.
That is, you may have the ceiling member 101a which followed the wall member 101 like FIG.
Since it has such a configuration, it is possible to prevent the oil scattered by the shaking due to use from being supplied directly to the opening, and to prevent the oil from being supplied to the oil circulation path more than necessary.
　図８は、別部材によって壁部材１０１が構成される場合の壁部材１０１及び貫通穴１０３の説明図である。なお、図８（ｂ）は、図８（ａ）のＢ－Ｂ断面の説明図である。 FIG. 8 is an explanatory diagram of the wall member 101 and the through hole 103 when the wall member 101 is constituted by another member. FIG. 8B is an explanatory diagram of the BB cross section of FIG.
　図８（ａ）のように、開口部３１ａを覆うのは、バッフルプレート７ｃとは別部材からなる別体壁部材１０９であってよい。
　図８（ｂ）のように、別体壁部材１０９は、別体天井部分１０９ａ、別体壁部分１０９ｂ及び別体接合部分１０９ｃから構成されている。そして、別体壁部材１０９は、バッフルプレート７ｃに接着剤によって固定されている。
　なお、別体壁部材１０９は必ずしも別体天井部分１０９ａを有する必要はなく、別体壁部分１０９ｂのみであってもよい。
　図９は、遮蔽板１０８を備えたバッフルプレートの説明図である。
　この例では、奥側周辺側貫通穴１０５ａを塞ぎ、手前側周辺貫通穴１０５ｂの数を減らすことで、下側タンク空間７ｂから上側タンク空間７ａにオイルが侵入しにくくなるようにしている。更にバッフルプレート７ｃの奥側と手前側のそれぞれに遮蔽板１０８ａ，１０８ｂを設けることで、供給通路３１の開口部３１ａへ向かってオイルが飛散するのを防いでいる。奥側と手前側のそれぞれに遮蔽板１０８ａ，１０８ｂを設けることで、特にチェーンソーやオリーブ収穫機のような、オイルタンク７内の奥側と手前側にオイルの揺れが生じやすい手持ち式作業機で、オイルタンク７内でのオイルの飛散を抑止でき、オイルが必要以上にオイル循環回路に供給されることを防止できる。 As shown in FIG. 8A, the opening 31a may be covered by a separate wall member 109 made of a member different from the baffle plate 7c.
As shown in FIG. 8B, the separate wall member 109 includes a separate ceiling portion 109a, a separate wall portion 109b, and a separate joint portion 109c. The separate wall member 109 is fixed to the baffle plate 7c with an adhesive.
The separate wall member 109 does not necessarily have the separate ceiling portion 109a, and may include only the separate wall portion 109b.
FIG. 9 is an explanatory diagram of a baffle plate provided with a shielding plate 108.
In this example, the back side peripheral through hole 105a is closed and the number of the front side peripheral through holes 105b is reduced, so that the oil does not easily enter the upper tank space 7a from the lower tank space 7b. Furthermore, by providing the shielding plates 108a and 108b on the back side and the near side of the baffle plate 7c, oil is prevented from scattering toward the opening 31a of the supply passage 31. By providing shielding plates 108a and 108b on the back side and the front side respectively, it is a hand-held work machine that is likely to sway oil on the back side and the front side in the oil tank 7, such as a chainsaw or olive harvester. Further, it is possible to suppress the scattering of oil in the oil tank 7 and to prevent the oil from being supplied to the oil circulation circuit more than necessary.
　＜実施形態の構成及び効果＞
　このような課題を解決するため、４サイクルエンジン１の潤滑装置は、オイルタンク７を有し、オイルタンク７は、オイルタンクを上側と下側に分割する板形状のバッフルプレート７ｃを有している。
　そして、オイルミストを供給し、循環するオイル循環経路の開口部３１ａが、オイルタンク７の中心付近、かつ、バッフルプレート７ｃの上側方向位置に配置され、バッフルプレート７ｃには、開口部３１ａの近傍に上側方向に延びる壁部材１０１が形成されている。
　このような構成、特にオイルタンク７を上側及び下側に分割するバッフルプレート７ｃを有することから、たとえ４サイクルエンジン１が振り回されるように使用されても、オイルタンクの下側に溜まっているオイルが飛散しにくく、開口部３１ａに直接オイル供給されにくく、オイルが必要以上にオイル循環経路に供給されることを防ぐことが可能となる。
　また、オイルタンク７の中心付近にオイル循環経路にオイルミストを供給する開口部３１ａが形成されていることによって、４サイクルエンジン１が傾く、又は、天地が逆転する等しても、中心付近にはオイルの油面が到達することが困難となる。その結果、オイルが必要以上にオイル循環経路に供給されることを防ぐことが可能となる。
　さらに、バッフルプレート７ｃには、開口部３１ａの近傍に上側方向に延びる壁部材１０１が形成されていることから、バッフルプレート７ｃの上側に回ったオイルが、必要以上にオイル循環経路に供給されることを防ぐことが可能となる。
　４サイクルエンジン１の潤滑装置は、以上の効果を相乗的に得ることが可能となり、オイルの消費を効果的に防ぐことができる。 <Configuration and Effect of Embodiment>
In order to solve such a problem, the lubricating device of the four-cycle engine 1 includes an oil tank 7, and the oil tank 7 includes a plate-shaped baffle plate 7c that divides the oil tank into an upper side and a lower side. Yes.
An opening 31a of the oil circulation path that supplies and circulates oil mist is disposed in the vicinity of the center of the oil tank 7 and in the upper side position of the baffle plate 7c. The baffle plate 7c has a vicinity of the opening 31a. A wall member 101 extending in the upward direction is formed.
Since the baffle plate 7c that divides the oil tank 7 into the upper side and the lower side is provided in such a configuration, even if the 4-cycle engine 1 is used so as to be swung, the oil accumulated in the lower side of the oil tank Is less likely to scatter and oil is not directly supplied to the opening 31a, and oil can be prevented from being supplied to the oil circulation path more than necessary.
Further, since the opening 31a for supplying oil mist to the oil circulation path is formed near the center of the oil tank 7, even if the 4-cycle engine 1 is tilted or the top and bottom are reversed, the opening 31a is located near the center. Makes it difficult for the oil level to reach. As a result, it is possible to prevent oil from being supplied to the oil circulation path more than necessary.
Further, since the wall member 101 extending upward is formed in the vicinity of the opening 31a in the baffle plate 7c, the oil that has turned to the upper side of the baffle plate 7c is supplied to the oil circulation path more than necessary. It becomes possible to prevent this.
The lubricating device for the four-cycle engine 1 can synergistically obtain the above effects, and can effectively prevent oil consumption.
　壁部材１０１の開口部３１ａとは反対側位置にバッフルプレート７ｃを貫通する貫通穴１０３が形成されている。
　このような構成を有することから、４サイクルエンジン１の潤滑装置は、バッフルプレート７ｃの上側に回ったオイルが、開口部３１ａに到達する前に貫通穴１０３から落下し、必要以上にオイル循環経路に供給されることを防ぐことが可能となる。 A through hole 103 that penetrates the baffle plate 7 c is formed at a position opposite to the opening 31 a of the wall member 101.
With such a configuration, the lubricating device of the 4-cycle engine 1 is such that the oil that has turned to the upper side of the baffle plate 7c falls from the through hole 103 before reaching the opening 31a, and the oil circulation path is more than necessary. Can be prevented from being supplied.
　貫通穴１０３は、壁部材１０１の近傍に形成されている。
　このような構成を有することから、４サイクルエンジン１の潤滑装置は、バッフルプレート７ｃの上側に回ったオイルが、壁部材１０１の手前でより確実に貫通穴１０３から落下させ、必要以上にオイル循環経路に供給されることを防ぐことが可能となる。 The through hole 103 is formed in the vicinity of the wall member 101.
With this configuration, the lubricating device of the four-cycle engine 1 causes the oil that has turned to the upper side of the baffle plate 7c to drop more reliably from the through hole 103 before the wall member 101, and to circulate oil more than necessary. It is possible to prevent supply to the route.
　壁部材１０１及び貫通穴１０３は、バッフルプレート７ｃを切り欠いてかつ折り曲げることによって形成されている。
　このような構成を有することから、壁部材１０１と貫通穴１０３を同時に形成することが可能となり、製造が簡便となるという効果がある。 The wall member 101 and the through hole 103 are formed by cutting out and bending the baffle plate 7c.
Since it has such a structure, it becomes possible to form the wall member 101 and the through-hole 103 simultaneously, and there exists an effect that manufacture becomes easy.
　壁部材１０１は、開口部３１ａを取り囲むようにそれぞれ２つ以上形成されている。
　このような構成を有することから、壁部材１０１によって、オイルが開口部３１ａに到達することをより効果的に防ぐことができるという効果がある。 Two or more wall members 101 are formed so as to surround the opening 31a.
Since it has such a configuration, there is an effect that the wall member 101 can more effectively prevent oil from reaching the opening 31a.
　バッフルプレート７ｃを折り曲げる事により、２つ以上の貫通穴１０３が、独立に形成されている。
　このような構成を有することから、貫通穴１０３とその貫通穴１０３に連説される貫通穴１０３との間に、バッフルプレート部材（壁部材間部分１０７）が残ることとなり、バッフルプレート７ｃの強度を保つことが可能となる。 By bending the baffle plate 7c, two or more through holes 103 are independently formed.
Since it has such a configuration, the baffle plate member (inter-wall member portion 107) remains between the through hole 103 and the through hole 103 connected to the through hole 103, and the strength of the baffle plate 7c. Can be maintained.
　壁部材１０１を開口部３１ａの側に更に折り曲げることで天井部材１０１ａが形成されている。
　このような構成を有することから、４サイクルエンジン１の潤滑装置は、使用による揺れにより飛散したオイルが、開口部３１ａに直接供給されることが防止され、必要以上にオイル循環経路に供給されることを防ぐことが可能となる。 The ceiling member 101a is formed by further bending the wall member 101 toward the opening 31a.
Due to such a configuration, the lubricating device of the four-cycle engine 1 is prevented from supplying oil that has been scattered due to shaking due to use directly to the opening 31a, and is supplied to the oil circulation path more than necessary. It becomes possible to prevent this.
　開口部３１ａはバッフルプレート７ｃが伸びている方向を向いて開口しており、壁部材１０１は、開口部３１ａを囲むように３方向に形成される。
　このような構成を有することから、バッフルプレート７ｃの上側に回ったオイルのうち開口部３１ａに向かうオイルをより確実に貫通穴１０３から落下させて、必要以上にオイル循環経路に供給されることを防ぐことが可能となる The opening 31a opens in the direction in which the baffle plate 7c extends, and the wall member 101 is formed in three directions so as to surround the opening 31a.
Since it has such a configuration, the oil that has gone to the upper side of the baffle plate 7c and that is directed toward the opening 31a is more reliably dropped from the through hole 103 and supplied to the oil circulation path more than necessary. Can be prevented
　壁部材１０１は、バッフルプレート７ｃとは別の部材によって形成されている。
　このような構成を有することから、より効果的な形状を有する壁部材１０１を用いて、オイルが開口部３１ａへ到達することを防ぐことが可能となる。 The wall member 101 is formed of a member different from the baffle plate 7c.
Since it has such a structure, it becomes possible to prevent oil from reaching the opening 31a using the wall member 101 having a more effective shape.
　バッフルプレート７ｃは、オイルタンク７を密封するガスケットの機能をも有する。
　このような構成を有することから、オイルタンク７を上側と下側に分けるバッフルプレート７ｃに、ガスケットの機能をも持たせることが可能となる。 The baffle plate 7 c also has a gasket function for sealing the oil tank 7.
With this configuration, the baffle plate 7c that divides the oil tank 7 into an upper side and a lower side can also have a gasket function.
　本発明のオイル循環経路は、４サイクルエンジンの潤滑のために循環するものであればどのようなものであってもよい。
　また、貫通穴の形状もどのようなものであってもよい。
　さらに、本発明において、独立とは各貫通穴が連通していないことをいう。
　本発明の壁部材の一例が、実施形態における壁部材１０１である。つまり、上側方向に立ちあがっているような形状を有しているものであれば、どのような形状であってもよい。必ずしも、オイルを通過しない板状の形状である必要もなく、メッシュなどで形成されているものであってもよい。
　さらに言えば、本発明の壁部材とは、上側方向のみに立ちあがっている必要はなく、傾いている、カーブを描く形状であってもよい。
　また、本発明は以上の実施形態に限定されるものではなく、様々な変化した構造、構成を有していて良い。 The oil circulation path of the present invention may be any as long as it circulates for lubrication of a 4-cycle engine.
The shape of the through hole may be any shape.
Furthermore, in the present invention, independent means that each through hole is not in communication.
An example of the wall member of the present invention is the wall member 101 in the embodiment. That is, any shape may be used as long as it has a shape that rises upward. It is not always necessary to have a plate-like shape that does not pass through the oil, and it may be formed of a mesh or the like.
Furthermore, the wall member of the present invention does not need to stand only in the upward direction, and may be an inclined and curved shape.
Further, the present invention is not limited to the above embodiment, and may have various changed structures and configurations.
　１…４サイクルエンジン、７…オイルタンク、７ｃ…バッフルプレート、７ｃ－１…弾性部材、７ｃ－２…板金部分、７ｄ…上側タンク部材、７ｅ…下側タンク部材、７ｆ…壁間部分、３１ａ…開口部、３３…プッシュロッド通路、１０１…壁部材、１０１ａ…天井部材、１０３…貫通穴、１０５…周辺部貫通穴、１０５ａ…奥側周辺貫通穴、１０５ｂ…手前側周辺貫通穴、１０７…貫通穴間部分、１０８…遮蔽板、１０８ａ…奥側遮蔽板、１０８ｂ…手前側遮蔽板、１０９…別体壁部材（壁部材） DESCRIPTION OF SYMBOLS 1 ... 4 cycle engine, 7 ... Oil tank, 7c ... Baffle plate, 7c-1 ... Elastic member, 7c-2 ... Sheet metal part, 7d ... Upper tank member, 7e ... Lower tank member, 7f ... Inter-wall part, 31a DESCRIPTION OF SYMBOLS ... Opening part 33 ... Push rod channel | path, 101 ... Wall member, 101a ... Ceiling member, 103 ... Through hole, 105 ... Peripheral part through hole, 105a ... Back side peripheral through hole, 105b ... Front side peripheral through hole, 107 ... Between through-holes, 108 ... shielding plate, 108a ... back shielding plate, 108b ... front shielding plate, 109 ... separate wall member (wall member)

Claims (10)

  1. 　オイルタンクを有し、
    　前記オイルタンクは、前記オイルタンクを上側と下側に分割する板形状のバッフルプレートを有し、
    　オイルミストを供給し、循環するオイル循環経路の開口部が、前記オイルタンクの中心付近、かつ、前記バッフルプレートの上側方向位置に配置され、
    　前記バッフルプレートには、前記開口部の近傍に上側方向に延びる壁部材が形成されていることを特徴とする
    　４サイクルエンジンの潤滑装置。     Have an oil tank,
    The oil tank has a plate-shaped baffle plate that divides the oil tank into an upper side and a lower side,
    An oil circulation path that supplies and circulates oil mist is disposed near the center of the oil tank and at an upper side position of the baffle plate,
    The four-cycle engine lubrication device, wherein a wall member extending upward is formed in the vicinity of the opening on the baffle plate.
  2. 　前記壁部材の前記開口部とは反対側位置に前記バッフルプレートを貫通する貫通穴が形成されていることを特徴とする
    　請求項１に記載の４サイクルエンジンの潤滑装置。     The four-cycle engine lubricating device according to claim 1, wherein a through-hole penetrating the baffle plate is formed at a position opposite to the opening of the wall member.
  3. 　前記貫通穴は、前記壁部材の近傍に形成されていることを特徴とする
    　請求項２に記載の４サイクルエンジンの潤滑装置。     The four-cycle engine lubricating device according to claim 2, wherein the through hole is formed in the vicinity of the wall member.
  4. 　前記壁部材及び前記貫通穴は、前記バッフルプレートを切り欠いてかつ折り曲げることによって形成されていることを特徴とする
    　請求項２に記載の４サイクルエンジンの潤滑装置。     The lubrication device for a four-cycle engine according to claim 2, wherein the wall member and the through hole are formed by cutting out and bending the baffle plate.
  5. 　前記壁部材は、前記開口部を取り囲むようにそれぞれ２つ以上形成されていることを特徴とする
    　請求項２に記載の４サイクルエンジンの潤滑装置。     The lubrication device for a four-cycle engine according to claim 2, wherein two or more wall members are formed so as to surround the opening.
  6. 　前記バッフルプレートを折り曲げる事により、２つ以上の前記貫通穴が、独立に形成されていることを特徴とする
    　請求項４に記載の４サイクルエンジンの潤滑装置。     The four-cycle engine lubricating device according to claim 4, wherein the two or more through holes are independently formed by bending the baffle plate.
  7. 　前記壁部材を前記開口部の側に更に折り曲げることで天井部材が形成されていることを特徴とする
    　請求項４に記載の４サイクルエンジンの潤滑装置。     The lubricating device for a 4-cycle engine according to claim 4, wherein a ceiling member is formed by further bending the wall member toward the opening.
  8. 　前記開口部は前記バッフルプレートが伸びている方向を向いて開口しており、
    　前記壁部材は、前記開口部を囲むように３方向の位置に形成されることを特徴とする
    　請求項４に記載の４サイクルエンジンの潤滑装置。     The opening is open in the direction in which the baffle plate extends,
    The four-cycle engine lubricating device according to claim 4, wherein the wall member is formed at a position in three directions so as to surround the opening.
  9. 　前記壁部材は、前記バッフルプレートとは別の部材によって形成されていることを特徴とする
    　請求項２に記載の４サイクルエンジンの潤滑装置。     The lubrication device for a 4-cycle engine according to claim 2, wherein the wall member is formed of a member different from the baffle plate.
  10. 　前記バッフルプレートは、前記オイルタンクを密封するガスケットの機能をも有することを特徴とする
    　請求項２に記載の４サイクルエンジンの潤滑装置。     The four-cycle engine lubrication device according to claim 2, wherein the baffle plate also has a function of a gasket for sealing the oil tank.
PCT/JP2011/072269 2010-11-30 2011-09-28 Lubrication device for four-stroke engine WO2012073587A1 (en)

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EP2744851B1 (en) 2011-08-19 2018-09-19 Akron Polymer Systems, Inc. Thermally stable, low birefringent copolyimide films

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5784317U (en) * 1980-11-14 1982-05-25
JP2002256839A (en) * 2001-02-28 2002-09-11 Sanshin Ind Co Ltd Dry sump lubricating structure of small craft
JP2004251231A (en) * 2003-02-21 2004-09-09 Fuji Robin Ind Ltd Lubricating device for four cycle engine
JP2007263069A (en) * 2006-03-29 2007-10-11 Makita Numazu Corp Portable 4-cycle engine and working machine equipped with it

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5784317U (en) * 1980-11-14 1982-05-25
JP2002256839A (en) * 2001-02-28 2002-09-11 Sanshin Ind Co Ltd Dry sump lubricating structure of small craft
JP2004251231A (en) * 2003-02-21 2004-09-09 Fuji Robin Ind Ltd Lubricating device for four cycle engine
JP2007263069A (en) * 2006-03-29 2007-10-11 Makita Numazu Corp Portable 4-cycle engine and working machine equipped with it

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