JP3602190B2 - Lubricating oil supply structure for engine intake - Google Patents

Description

[0001]
[Industrial applications]
The present invention relates to a lubricating oil supply structure for an intake portion of an engine used mainly for small boats.
[0002]
[Prior art]
Recently, a water jet propulsion system has been installed at the bottom of the ship, and a driver's seat has been installed on the ship. Watercraft such as water jet propulsion boats are widely used.
[0003]
[Problems to be solved by the invention]
In the above-mentioned small boat, capsizing often occurs during the cruising, and water may enter the intake passage during the capsizing. Since the lubricating oil on the rotating part of the shaft of the throttle valve is washed away by the intruded water, it is desirable to always supply the lubricating oil to the rotating part. In addition, it is desired that the engine has a configuration that is as compact as possible due to restrictions on weight and volume.
[0004]
SUMMARY OF THE INVENTION The present invention has been made to solve such a conventional disadvantage, and has as its object to provide a lubricating oil supply structure for an intake portion of a simple engine in a compact engine. It is.
[0005]
[Means for Solving the Problems]
According to a first aspect of the present invention, a butterfly-type throttle valve is installed in an intake pipe communicating with a cylinder of an engine with its axis directed toward the crankshaft, and the intake pipe is inclined upward so as to approach the cylinder toward the upper side. An intake member is attached to the upper end thereof, and a lubricating oil passage for guiding lubricating oil from outside the intake pipe is opened in the intake pipe upstream of the throttle valve, and the opening includes an axis of the intake pipe, A throttle valve and a choke valve each comprising a butterfly-type throttle valve are provided in the intake pipe while being positioned so as to be located on a side opposite to the inclined side of the intake pipe with respect to a center plane extending in the crankshaft direction. The throttle valve is located downstream of the fuel supply unit, the choke valve is located upstream of the fuel supply unit, and the opening of the lubricating oil passage is approximately between the throttle valve shaft and the choke valve shaft. In the lubricating oil supply structure of the intake portion of the engine that are respectively located right above,
The opening area of the opening located above the throttle valve shaft is set larger than the opening area of the opening located above the choke valve shaft .
[0006]
According to a second aspect of the present invention , a butterfly-type throttle valve is installed in an intake pipe communicating with a cylinder of an engine with its axis directed toward a crankshaft, and the intake pipe is inclined upward so as to approach the cylinder toward the upper side. An intake intake member is attached to the upper end thereof, and a lubricating oil passage for guiding lubricating oil from outside the intake pipe is opened in the intake pipe upstream of the throttle valve, and this opening includes an axis of the intake pipe, In the lubricating oil supply structure of the intake portion of the engine, which is positioned so as to be located on the side opposite to the inclined side of the intake pipe with respect to the center plane extending in the crankshaft direction,
At the upper end of the intake pipe, an upper wall extending outward from the inner wall of the intake pipe is formed, and the lubricating oil passage has an inlet-side passage penetrating from the outside to the inside at the upper end of the intake pipe. It is formed by an outlet-side passage formed by a groove that is connected to the inlet-side passage and that is open at the top in the upper wall.
[0007]
According to a third aspect of the present invention, in the second aspect of the present invention, the outlet-side passage has a pair of openings that branch from the outlet end of the inlet-side passage and open to the inner wall of the intake pipe, and each opening is a throttle valve. Are located almost directly above both shaft ends of the shaft.
[0008]
According to a fourth aspect of the present invention, in the third aspect of the present invention, the lubricating oil passage extends in a direction away from the center plane on the opposite side of the intake pipe with respect to the center plane toward the upstream, so that the inlet of the inlet-side passage is formed. It is formed so that the height decreases as it goes from the end to the opening of the exit-side passage.
[0009]
【The invention's effect】
According to the first aspect of the present invention, since the intake pipe is inclined toward the cylinder block and the intake intake member is disposed close to the cylinder head, the installation position of the intake intake member is lowered and the overhang to the engine side is prevented. With less, the engine can be made compact. The opening of the lubricating oil passage is positioned so as to be located almost directly above the throttle valve shaft on the side opposite to the inclination of the intake pipe with respect to a plane extending in the crankshaft direction including the axis of the intake pipe. Therefore, the lubricating oil from the opening is reliably supplied to the throttle valve shaft.
[0010]
Further, since the opening of the lubricating oil passage is located directly above the throttle valve shaft and the choke valve shaft, the lubricating oil from the opening is reliably supplied to both the throttle valve shaft and the choke valve shaft. be able to.
[0011]
Further, since the fuel supply unit is provided upstream of the throttle valve shaft, there is a possibility that the lubricating oil attached to the throttle valve shaft may be washed away by the fuel. Since the opening area is set to be larger than the opening area of the opening located above the choke valve shaft, sufficient lubricating oil can be supplied to the throttle valve shaft, and the throttle valve shaft can be reliably lubricated. .
[0012]
According to the second aspect of the present invention, since the intake pipe is inclined toward the cylinder block and the intake member is disposed close to the cylinder head, the installation position of the intake member is lowered and the overhang to the engine side is prevented. With less, the engine can be made compact. The opening of the lubricating oil passage is positioned so as to be located almost directly above the throttle valve shaft on the side opposite to the inclination of the intake pipe with respect to a plane extending in the crankshaft direction including the axis of the intake pipe. Therefore, the lubricating oil from the opening is reliably supplied to the throttle valve shaft.
[0013]
Further, since the outlet side passage forming the lubricating oil passage is formed by a groove having an open top on the upper wall formed at the upper end portion of the intake pipe, the outlet side passage is formed when the intake pipe is manufactured. And can be formed integrally.
[0014]
According to the third aspect of the invention, since each opening of the outlet-side passage is located almost directly above both shaft ends of the throttle valve shaft, lubricating oil is reliably supplied to both shaft ends of the throttle valve shaft. can do.
[0015]
According to the fourth aspect of the present invention, the lubricating oil passage is formed so as to extend in the direction away from the center plane on the anti-inclination side of the intake pipe toward the upstream, but such that the intake pipe is closer to the cylinder as it goes upward. Because of the inclination, the lubricating oil passage can be easily formed so as to be lower toward the outlet side by utilizing the inclination, and therefore the lubricating oil supplied from the inlet side naturally flows through the lubricating oil passage. Thus, the oil is smoothly supplied to the throttle valve shaft.
[0016]
【Example】
In FIG. 1, an engine 10 is installed on a bottom plate 17 in a hull 100. The engine 10 has a cylinder block 1 disposed in the center in the width direction and a cylinder head 12 having an ignition means 13 above the cylinder block 1. A piston 15 is mounted in the cylinder 11 so as to be able to reciprocate up and down, and a crankshaft 19 extending in a length direction of the hull (perpendicular to the plane of FIG. 1) is disposed below the piston 15. On one side of the cylinder block 1, intake pipes 3 are arranged corresponding to the cylinders of a plurality of cylinders (in a parallel arrangement with the arrangement of the cylinders). It is inclined to the side and extends upward. A connecting member 4 is attached to the upper end of each intake pipe 3 via a packing 39 in a sealed structure, and an intake intake member 5 is attached above the connecting member 4. A choke valve (butterfly-type throttle valve) 32, a venturi (fuel supply unit) 35, and a throttle valve (butterfly-type throttle valve) 33 are sequentially installed from an upper part in an intake passage 30 in the intake pipe 3, and a lower end thereof. In the section, the intake passage 30 communicates with the crankcase of each cylinder via a reed valve 31. The shaft 34 of the throttle valve 32 is arranged in the direction in which the cylinders are arranged.
[0017]
The connecting member 4 constitutes a part of the intake pipe. In this embodiment, the connecting member 4 is formed separately from the intake pipe 3. Components having a similar function may be integrally formed.
[0018]
The intake member 5 is formed of a semi-cylindrical body extending in the direction in which the cylinders are arranged. Inside the intake member 5, an intake passage 51 that opens downward is formed. At the side of the cylinder, a central intake intake 52 is formed to protrude laterally, and at the end, an end intake intake 53 is formed, and the two intake intakes 52, 53 are respectively directed downward. It is open to.
[0019]
In this embodiment, a two-cylinder engine is used, and the connecting member 4 is configured as shown in FIGS. That is, the connecting member 4 extends in the direction in which the cylinders are arranged, and the through holes 40 respectively corresponding to the two intake passages 30 are formed so that the inner walls 49 thereof are smoothly connected to the inner walls of the respective intake passages 30 (this embodiment). In this case, they are formed so as to be flush. In addition, the peripheral wall 47 of the connecting member 4 includes an inlet-side passage 41 penetrating from the outside to the inside, and a pair of openings 43 branching from the outlet end of the inlet-side passage 41 and opening to the inner wall 49 of the connecting member 4. A lubricating oil passage 400 including the outlet side passage 42 is formed. A lubricating oil pipe (not shown) is connected to the inlet side passage 41 so that lubricating oil is supplied from an oil pump. The opening 43 is positioned so as to be located directly above the shaft end of the shaft 34 of the throttle valve 33 provided in the intake passage 30 (see FIG. 1). That is, the opening 43 is located almost directly above the throttle valve shaft 34 on the side opposite to the inclination of the intake pipe 3 with respect to the center plane 39 including the axis of the intake pipe 3 and extending in the direction of the crankshaft 19. Position is set.
[0020]
In addition, since the intake pipe 3 is installed obliquely, the connecting member 4 attached thereto is also inclined, so that the lubricating oil passage 400 extends from the entrance end of the entrance side passage 41 to the opening of the exit side passage 42. The height is gradually reduced to 43. The outlet side passage 42 is formed by a groove whose upper side is open.
[0021]
An intake member 5 is fixed above the connecting member 4 with a wire mesh 54 for preventing flashback and a packing 55 interposed therebetween, and is thereby connected to the lower end surface of the intake member 5 with a seal structure.
[0022]
In the above-described configuration, the intake pipe 3 is configured to be inclined upward toward the cylinder block 1 so as to be closer to the cylinder toward the upper side, and to extend upward so that the overall width of the engine at the upper side is reduced. By arranging the central intake port 52 close to the cylinder head 12 by inclining toward the block 1 side, the installation height of the intake port member 5 is reduced, and the engine has a compact configuration. In this configuration, a lubricating oil passage 400 is formed in the connecting member 4, and the opening 43 is set so as to be located directly above the shaft end of the shaft 34 of the throttle valve 33 provided in the intake passage 30. Therefore, the lubricating oil from the opening falls along the inner wall of the intake passage 30 as shown by arrows in FIGS. 1, 3, and 4 and is supplied to the shaft end of the shaft 34 of the throttle valve 33. Will be done. Moreover, in this configuration, if the lubricating oil passage 400 is formed horizontally in the connecting member 4 installed at an angle, the lubricating oil passage 400 is formed so as to be gradually lower toward the outlet side. The supplied lubricating oil flows naturally in the lubricating oil passage 400 and flows out of the opening 43. In the case where the lubricating oil passage 400 is formed by continuously connecting the outlet side passage 42 formed of a groove whose upper end is open at the outlet end to the inlet side passage 41 penetrating from the outside to the inside of the connecting member 4. In addition, the connecting member 4 having the lubricating oil passage 400 can be easily manufactured as a single body using a metal casting because the structure is simplified.
[0023]
FIGS. 6 and 7 show another example of the fuel supply mechanism. The lubricating oil passage 400 is formed by branching from the outlet end of the inlet-side passage 41 to form an outlet-side passage 42 in the same manner as described above. A branch passage 430 branching from the middle is formed in the opening 42, and the downstream ends thereof are opened to the inner wall 49 of the connecting member 4 to form openings 43 and 431, respectively. The opening 43 is located directly above the shaft end of the shaft 34 of the throttle valve 33, and the opening 431 is located directly above the shaft of the choke valve 32. The outlet passage 42 and the opening 43 are formed larger than the branch passage 430 and the opening 431. Other configurations are the same as in the above embodiment.
[0024]
In this configuration, the lubricating oil from the openings 43 and 431 drops along the inner wall of the intake passage 30 as shown by arrows in FIG. 6, and the shaft end of the shaft 34 of the throttle valve 33 and the shaft end of the choke valve 32 Will be supplied to the respective sections. The opening 43 is formed larger than the opening 431 so as to supply a large amount of lubricating oil. This is because the venturi (fuel supply unit) 35 is disposed above the throttle valve shaft 34. The reason is to sufficiently supply the lubricating oil to the throttle valve shaft 34 in consideration of the fact that the lubricating oil supplied to the throttle valve shaft 34 is washed by the fuel.
[0025]
FIG. 8 shows still another example of the fuel supply mechanism, which has a configuration similar to the configuration of FIGS. 1 to 5 described above, and in which the installation position of the lubricating oil passage opening 43 is the position of the throttle valve shaft 34 and the choke valve 32. The only difference is that it is located above the middle part of the shaft. In this configuration, the center line of the trajectory of the lubricant flowing down will pass through the middle of both shafts as shown by the broken line in the figure, but since the lubricant flowing down has a certain width, the lubricant is supplied to both shafts. Will be.
[0026]
FIGS. 9 and 10 show still another example of the fuel supply mechanism, which has the same configuration as that shown in FIGS. 1 to 5 described above, and supplies the lubricating oil supplied from the opening 43 of the lubricating oil passage to a throttle valve. The only difference is that a guide groove 432 for guiding to the shaft end of the shaft 34 is provided on the wall surface of the intake passage 30. In this configuration, the lubricating oil flows along the guide groove 432 and is reliably supplied to the throttle valve shaft 34. In addition, such a guide groove can also be adopted in the configurations of FIGS.
[Brief description of the drawings]
FIG. 1 is a partial longitudinal sectional view of an engine showing an embodiment of the present invention.
FIG. 2 is a plan view of the connecting member of FIG. 1;
FIG. 3 is a sectional view taken along line AA of FIG. 2;
FIG. 4 is a sectional view taken along line BB of FIG. 2;
FIG. 5 is a sectional view taken along line CC of FIG. 2;
FIG. 6 is a sectional view of a lubricating oil supply unit according to another embodiment of the present invention.
FIG. 7 is a diagram corresponding to FIG. 2, showing a planar shape of the lubricating oil supply unit in FIG. 6;
FIG. 8 is a diagram corresponding to FIG. 6, showing another example of a lubricating oil supply unit.
FIG. 9 is a diagram corresponding to FIG. 6, showing still another example of the lubricating oil supply unit.
FIG. 10 is a sectional view taken along line II of FIG. 9;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Cylinder block 3 Intake pipe 4 Connecting member 5 Intake intake member 30 Intake passage 32 Choke valve 33 Throttle valve 34 Throttle valve shaft 41 Inlet side passages 42 and 430 Outlet side passages 43 and 431 Lubricating oil passage opening 400 Lubricating oil passage 432 Guide groove for lubricating oil

Claims (4)

A butterfly-type throttle valve is installed in the intake pipe communicating with the cylinder of the engine, with its axis facing the crankshaft direction. A take-in member is attached, and a lubricating oil passage for guiding lubricating oil from outside of the intake pipe is opened in the intake pipe upstream of the throttle valve, and the opening includes the axis of the intake pipe and extends in the center plane extending in the crankshaft direction. The intake pipe is provided with a throttle valve and a choke valve formed of a butterfly type throttle valve, and the throttle valve is provided with a fuel valve. The choke valve is located downstream from the supply section, the choke valve is located upstream from the fuel supply section, and the opening of the lubricating oil passage is located almost directly above the throttle valve axis and the choke valve axis. In the lubricating oil supply structure of the intake portion of the to have the engine,
A lubricating oil supply structure for an intake portion of an engine, wherein an opening area of an opening located above the throttle valve shaft is set larger than an opening area of an opening located above a choke valve shaft . A butterfly-type throttle valve is installed in the intake pipe communicating with the cylinder of the engine, with its axis facing the crankshaft direction. A take-in member is attached, and a lubricating oil passage for guiding lubricating oil from outside the intake pipe is opened in the intake pipe upstream of the throttle valve. In the lubricating oil supply structure of the intake section of the engine, which is set to be located on the side opposite to the inclined side of the intake pipe with respect to
At the upper end of the intake pipe, an upper wall extending outward from the inner wall of the intake pipe is formed, and the lubricating oil passage has an inlet-side passage penetrating from the outside to the inside at the upper end of the intake pipe. A lubricating oil supply structure for an intake portion of an engine, wherein the lubricating oil supply structure for an engine is formed by an outlet-side passage formed by a groove having an open upper side in the upper surface wall and communicating with the inlet-side passage . The outlet-side passage has a pair of openings that branch from the outlet end of the inlet-side passage and open to the inner wall of the intake pipe, and each opening is located almost directly above both shaft ends of the throttle valve shaft. 3. The lubricating oil supply structure for an intake section of an engine according to claim 2, wherein: The lubricating oil passage extends in a direction away from the center plane on the anti-inclination side of the intake pipe with respect to the center plane, so that the height of the lubricating oil passage increases from the inlet end of the inlet passage to the opening of the outlet passage. The lubricating oil supply structure for an intake portion of an engine according to claim 3 , wherein the lubricating oil supply structure is formed so as to be lower .

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