JP2009162079A - Crank chamber compression type internal combustion engine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a crank chamber compression type internal combustion engine that does not sucks air even if a fuel level is largely inclined at the abrupt braking or abrupt turning of a vehicle, or during ascending or descending a slope. <P>SOLUTION: A crank chamber compression type internal combustion engine includes a lubricating oil reservoir chamber 38 provided outside a crank chamber 2a, and at a lower side from a cylinder head 4, an oil supply passage 39 for making the lubricating oil reservoir chamber 38 communicate with a lubricated part of a valve gear 15, and a lubricating oil pump 40 provided at the oil supply passage 39 for supplying lubricating oil in the lubricating oil reservoir chamber 38 to the lubricated part. An fuel suction port 39a of the oil supply passage 39 is located at a lower level than a fuel level S' in the lubricating oil reservoir chamber 38 when it is in a maximum inclination state. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a crankcase compression internal combustion engine, and more particularly, to lubrication of a valve operating device when a valve operating device is provided in a cylinder head.

  As a crank chamber compression type internal combustion engine, a two-cycle internal combustion engine in which air is primarily compressed in the crank chamber as the piston moves up and down and is supplied to the combustion chamber through the scavenging port, or the crank chamber is sucked by a connecting rod There is a four-cycle internal combustion engine that is divided into a chamber and a pressurizing chamber and pressurizes air to supercharge the combustion chamber.

In this type of internal combustion engine, when the cylinder head is provided with a valve operating device comprising a valve for supplying fuel or air, a valve for discharging combustion gas, and a drive mechanism for opening and closing these valves, It is necessary to provide a valve system lubrication device for lubricating the valve device. On the other hand, in the case of this type of crankcase compression type internal combustion engine, since the crank chamber is used as a pressurizing chamber, a lubricating oil storage chamber (oil pan) cannot be formed at the bottom of the crank chamber. A lubricating oil storage chamber (oil tank) is provided outside (see, for example, Patent Document 1).
JP-A-8-28351

  By the way, when an internal combustion engine in which the conventional lubricating oil storage chamber is provided outside the crank chamber is mounted on a vehicle, depending on the arrangement structure, the vehicle is suddenly braked, suddenly turned, uphill or downhill. There is a concern that air may be sucked from the suction port of the oil supply passage due to the inclination of the oil level.

  The present invention has been made in view of the above-described conventional situation, and is a crank chamber compression type internal combustion engine that does not inhale air even when the oil level is greatly inclined at the time of sudden braking or turning of a vehicle or when climbing or descending a slope. The challenge is to provide an organization.

  The invention according to claim 1 is a crank chamber compression type internal combustion engine provided with a valve operating device that opens and closes a valve opening formed to open to the combustion chamber by means of a valve inside the cylinder chamber. A lubricating oil storage chamber provided below the cylinder head, an oil supply passage communicating the lubricating oil storage chamber and a lubricated portion of the valve operating device, and interposed in the oil supply passage, A lubricating oil pump for supplying lubricating oil to the lubricated part, and the suction port of the oil supply passage is located below the oil level of the lubricating oil in the lubricating oil storage chamber when in the maximum inclined state It is characterized by that.

  A second aspect of the present invention is the crank chamber compression internal combustion engine according to the first aspect, further comprising a plurality of cylinders, wherein the lubricating oil storage chamber is provided in a portion between adjacent cylinders of the cylinder block. It is said.

  According to a third aspect of the present invention, in the crankcase compression internal combustion engine according to the second aspect, the lubricating oil recovery passage for recovering the lubricating oil that has lubricated the lubricated portion in the lubricating oil storage chamber is adjacent to the cylinder head. It is characterized by being formed in the part between the cylinders.

  According to a fourth aspect of the present invention, in the crank chamber compression internal combustion engine according to the first aspect, the lubricating oil storage chamber is formed on a side wall of a cylinder block.

  According to a fifth aspect of the present invention, in the crank chamber compression internal combustion engine according to any one of the second to fourth aspects, the lubricating oil recovery passage for recovering the lubricating oil that has lubricated the lubricated portion in the lubricating oil storage chamber is provided. It is characterized in that it is formed along the side wall of the cylinder block from the side wall at the cam shaft direction end of the cylinder head.

  According to a sixth aspect of the present invention, in the crankcase compression internal combustion engine according to the first aspect, the lubricating oil pump is disposed in the cylinder head and between the camshaft and the combustion chamber. It is characterized by being driven to rotate.

  According to the crank chamber compression internal combustion engine of the first aspect of the invention, the lubricating oil storage chamber is provided outside the crank chamber and below the cylinder head, and the lubricating oil storage chamber and the valve device are covered. The suction port of the oil supply passage that communicates with the lubrication part is positioned below the oil level of the lubricant in the lubricating oil storage chamber when it is in the maximum inclination state. Even if the oil level is greatly inclined during downhill, the suction port is not exposed to the air, and therefore, air is not sucked.

  According to the second aspect of the present invention, since the lubricating oil storage chamber is provided in the portion between the cylinders adjacent to each other in the cylinder block, the lubricating oil storage chamber can be formed using the space between the cylinders, and the lubricating oil storage chamber can be used as the cylinder head. It can be made to adjoin to the to-be-lubricated part provided in the inside.

  In the invention of claim 3, since the lubricating oil recovery passage is formed in the portion between the cylinders adjacent to each other in the cylinder head, the lubricating oil recovery passage can be shortened, and the lubricated lubricating oil can be quickly transferred to the lubricating oil storage chamber. The oil level can be recovered quickly by recovering, and air inhalation can be prevented from this point.

  In the invention of claim 4, since the lubricating oil storage chamber is formed on the side wall of the cylinder block, it is easy to secure a space for arranging the lubricating oil storage chamber.

  In the invention of claim 5, since the lubricating oil recovery passage is formed so as to extend along the side wall of the cylinder block from the side wall located at both ends of the cylinder head in the cam shaft direction, the internal combustion engine is inclined in the left or right direction. In this case, even when a centrifugal force is applied, the lubricating oil after lubrication can be promptly collected in the lubricating oil storage chamber and the oil level drop can be quickly recovered, and air inhalation can also be prevented from this point.

  In the invention of claim 6, since the lubricating oil pump is disposed in the cylinder head and between the cam shaft and the combustion chamber, the lubricating oil pump is used by utilizing the space between the cam shaft and the combustion chamber. The engine can be configured compactly. Further, the lubricating oil pump can be disposed close to the lubricating oil storage chamber, and the lubricating oil can be sucked and discharged with less power.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

  1 to 7 are views for explaining a crankcase compression type two-cycle gas fuel internal combustion engine according to an embodiment of the present invention.

  In the figure, reference numeral 1 denotes a crank chamber compression type two-cycle parallel two-cylinder gas fuel internal combustion engine, which has the following schematic structure. A cylinder block 3 is connected to the upper joint surface of the vertically split crankcase 2, a cylinder head 4 is connected to the upper joint surface of the cylinder block 3, and a head cover 29 is connected to the cylinder head 4. Yes.

  The inside of the crankcase 2 is defined by two independent crank chambers 2a, 2a, and a crankshaft 5 common to each cylinder is accommodated in the crankcase 2. Further, pistons 6 and 6 are slidably disposed in cylinder bores (cylinders) 3 a and 3 a formed in the cylinder block 3, and each piston 6 is connected to the crankshaft 5 via a piston pin 6 b and a connecting rod 7. Are connected to the crankpin 5a.

  The crankcase 2 is formed with each cylinder independent intake passage 2b communicating with each crank chamber 2a. A reed valve 10 is inserted and disposed in each intake passage 2b to prevent the backflow of air flowing into the crank chamber 2a.

  Each intake passage 2b is connected to a throttle body 12 containing a throttle valve 11 via a joint member 12a. A common air cleaner 13 is connected to the upstream side of the throttle body 12.

  The cylinder block 3 is formed with an exhaust port 3b located on the opposite side of the intake passage 2b with the cylinder axis a interposed therebetween. Although not shown, an exhaust pipe is connected to the exhaust port 3b, and a muffler is connected to the downstream end of the exhaust pipe.

  The cylinder block 3 is formed with a plurality of scavenging ports 3c for introducing air primarily compressed in the crank chamber 2a by the lowering of the piston 6 into the cylinder bores 3a. The cylinder bore 3a side opening 3c 'of each scavenging port 3c is arranged at a predetermined interval in the circumferential direction so as to surround the opposite side portion of the exhaust port 3b.

  A combustion recess 4a is formed in a lower mating surface portion of the cylinder head 4 facing the cylinder bore 3a. A space surrounded by the combustion recess 4a, the cylinder bore 3a, and the top surface 6a of the piston 6 located substantially at the top dead center is a combustion chamber 8.

  The cylinder head 4 is provided with a spark plug 9 for each cylinder, and an electrode portion 9a of the spark plug 9 is located in the combustion recess 4a. The spark plug 9 is located on the exhaust port 3b side from the cylinder axis a when viewed in the crankshaft direction, and the axis b of the spark plug 9 is on the exhaust port side at a predetermined angle θ with respect to the cylinder axis a. It arrange | positions so that it may incline (refer FIG. 2).

  The gas fuel internal combustion engine 1 includes a fuel supply device 14 for supplying gas fuel to the combustion chamber 8 and a valve operating device 15 for supplying and shutting off the gas fuel to and from the combustion chamber by the fuel supply device 14. ing.

  The fuel supply device 14 has the following schematic structure. Two combustion chamber openings 4b and 4b per cylinder are formed to open to the combustion recess 4a. The fuel supply passages 16, 16 communicate with the openings 4 b, 4 b, and gas fuel supply valves 17, 17 are connected to the outer openings of the fuel supply passages 16, 16. Each fuel supply passage 16 communicates with a first sub pressure accumulating chamber 19 via a first sub communication passage 18. In addition, a second sub pressure accumulation chamber 21 communicates with the first sub pressure accumulation chamber 19 via a second sub communication path 20. Reference numeral 18 a denotes a ball that closes a machining hole that opens to the outside of the first sub-communication passage 18.

  A spool valve type switching control valve 22 for turning on / off the communication of the first sub-communication passage 18 to the fuel supply passage 16 is provided at a connection portion between the fuel supply passage 16 and the first sub-communication passage 18. Has been. The second sub-communication passage 20 is provided with an open / close control valve 23 for opening and closing the passage.

  The valve operating device 15 has the following schematic structure. Poppet valves 24 and 24 for opening and closing the openings are disposed in the combustion chamber openings 4b and 4b. Each poppet valve 24 has a rod-shaped valve shaft 24a and a circular and umbrella-shaped valve head 24b integrally formed at the lower end of the valve shaft 24a. The peripheral edge of the back surface of the valve head 24b abuts on or separates from the peripheral edge of the combustion chamber opening 4b, thereby closing or opening the combustion chamber opening 4b.

  Each poppet valve 24 is slidably supported by a valve guide member 25 after being press-fitted into the cylinder head 4. The fuel supply passage 16 communicates with a main pressure accumulating chamber 26 which is a space surrounded by the valve shaft 24a, the valve head 24b and the valve guide member 25 of the poppet valve 24.

  A retainer 27 is mounted on the upper end of the valve shaft 24a, and a spring 28 that normally biases the poppet valve 24 in the closing direction is interposed between the retainer 27 and the spring seat 4c of the cylinder head 4. Has been.

  A cam accommodating portion 4 d is formed on the upper portion of the cylinder head 4 so as to extend upward while surrounding the upper portion of the valve shaft 24 a of the poppet valve 24. An oil-tight cam chamber 30 is formed by the cam housing portion 4d and the head cover 29 attached thereto. The head cover 29 is composed of a cylindrical cover main body 29a and a lid 29b that closes the upper end opening thereof. The cover body 29a also functions as a cam cap described later.

  A single camshaft 31 common to both cylinders is disposed in the cam chamber 30 in parallel with the crankshaft 5. The cam shaft 31 has two cam noses 31a for each cylinder, and has journal portions 31b on both sides of the cam noses 31a and 31a. The journal portion 31b is rotatably supported by a cam carrier portion 4e formed on the cylinder head 4 side and a cam cap portion 29c detachably mounted on the cam carrier portion 4e. The cam cap portion 29 c is formed on the cover body 29 a of the head cover 29.

  Furthermore, one end of the cam shaft 31 protrudes outward from the cam chamber 30, and a flange 31d for attaching a cam pulley is formed on the protrusion 31c. The camshaft 31 is rotationally driven by the crankshaft 5 via a cam pulley fixed to the flange portion 31d.

  A rocker arm 32 for moving the poppet valve 24 in the axial direction is disposed below the cam shaft 31. A tip end portion 32 a of the rocker arm 32 is in sliding contact with a pad member 24 c mounted on the upper end of the valve shaft 24 a of the poppet valve 24. The base 32 b is supported by a lash adjuster 33. The lash adjuster 33 urges the base portion 32b of the rocker arm 32 upward by hydraulic pressure so that the valve gap formed between the tip end portion 32a of the rocker arm 32 and the pad member 24c of the poppet valve 24 is always zero. Yes. A cam roller 32 c is rotatably mounted on the rocker arm 32, and the cam roller 32 c is in rolling contact with the cam nose portion 31 a of the cam shaft 31.

  The gas fuel supplied from the gas fuel supply valve 17 passes from the fuel supply passage 16 into the main pressure accumulation chamber 26, further through the first sub communication passage 18, into the first sub pressure accumulation chamber 19, and further to the second sub pressure accumulation chamber 19. It is stored in the second auxiliary pressure accumulating chamber 21 through the passage 20. The gas fuel stored in this manner is injected and supplied into the combustion chamber 8 from the combustion chamber opening 4b when the poppet valve 24 is opened.

  The gas fuel supply valve 17 supplies gas fuel to the main pressure accumulation chamber 26 or the first and second sub pressure accumulation chambers 19 and 21 during a period when the poppet valve 24 is closed. The poppet valve 24 starts to open before the exhaust port 3b is fully closed, and closes after the exhaust port 3b is fully closed. Specifically, for example, about 35 ° before and after the crank angle position at which the exhaust port 3b is fully closed, that is, the poppet valve 24 opens about 70 ° in crank angle.

  Further, the gas fuel that has entered between the valve shaft 24a of each poppet valve 24 and the guide hole 25a of the valve guide member 25 is introduced into the scavenging port 3c via the leak gas introduction passage 34. A reed valve 35 is interposed in the middle of the leak gas introduction passage 34, and the reed valve 35 allows only the flow from the poppet valve 24 side to the scavenging port 3c side.

  In this embodiment, the internal combustion engine 1 includes a crankshaft lubrication device 36 that supplies two-cycle oil to the lubricated portion related to the crankshaft 5, and valve system lubrication that supplies four-cycle oil to the lubricated portion related to the valve gear 15. Device 37.

  The crankshaft lubrication device 36 includes an oil tank 36a that stores two-cycle oil, an oil passage 36d that connects the oil tank 36a and an oil supply port 36c of the joint member 12a connected to the intake passage 2b, And an oil pump 36b interposed in the middle of the oil passage 36.

  The two-cycle oil in the oil tank 36a is supplied to the oil supply port 36c by the oil pump 36b, mixed with the air sucked into the intake passage 2b, and stirred by the crankshaft 5 in the crank chamber 2a to become a mist. The mist-like lubricating oil lubricates the journal portion 5 ′ of the crankshaft 5, the crankpin 5 a, the piston pin 6 a and the sliding surface between the piston 6 and the cylinder bore 3 a. The lubricated lubricating oil is introduced into the combustion chamber, burned with fuel, and discharged.

  The valve system lubrication device 37 includes a lubricant storage chamber 38 provided outside the crank chamber 2 a and below the cylinder head 4, and the lubricant storage chamber 38 and the valve operating device 15. Lubricating lubricating oil after lubrication, an oil supply passage 39 communicating with the lubricating portion, a lubricating oil pump 40 interposed in the oil supplying passage 39 for supplying the lubricating oil in the lubricating oil storage chamber 38 to the lubricated portion, and The oil storage chamber 38 includes a lubricating oil recovery passage 43 for recovery, and has the following structure.

  The lubricating oil storage chamber 38 is formed between the left and right cylinder bores 3a, 3a of the cylinder block 3 and has a vertically long, generally rectangular box shape. The lubricating oil storage chamber 38 is cut in a plane perpendicular to the cylinder axes a and a and viewed from above, as shown in FIG. 6, the cylinder block 3 has a substantially entire area from the intake side wall 3d to the exhaust side wall 3e. It has cross-sectional dimensions. Further, a portion 38c sandwiched between arc-shaped water cooling jackets 3f formed on the outer wall portion of the cylinder bore 3a is slightly narrowed down. The lubricating oil storage chamber 38 is cut in a plane perpendicular to the crankshaft and parallel to the cylinder axis a and viewed in the crankshaft direction, as shown in FIG. Having a height dimension h greater than ½ of

  A suction chamber 38 a is formed at the intake side end of the bottom wall 38 ′ of the lubricating oil storage chamber 38. The suction chamber 38a is formed so as to protrude slightly from the intake side wall 3d of the cylinder block 3, and a drain cap 38b is detachably screwed into the bottom of the suction chamber 38a. An oil level gauge 42 is inserted into the lubricating oil storage chamber 38. The grip part 42 a of the oil level gauge 42 is disposed so as to protrude upward from the upper wall of the cylinder head 4.

  The oil supply passage 39 includes an oil suction port 39a disposed in the suction chamber 38a of the lubricating oil storage chamber 38, and a suction passage 39b that communicates the oil suction port 39a with the suction port 40a of the lubricating oil pump 40. 39c and discharge passages 39d and 39e communicating with the discharge port 40b of the lubricating oil pump 40 and the main oil hole 39f. In addition, 39g is an oil strainer.

  The oil suction port 39a is press-fitted into the lower end portion of the suction passage 39b and protrudes toward the bottom surface of the suction chamber 38a. Here, the oil level S of the lubricating oil in the lubricating oil storage chamber 38 is located near the upper end of the lubricating oil storage chamber 38 when the internal combustion engine 1 is stopped. On the other hand, at the time of sudden braking, sudden turning, uphill or downhill, the oil surface S ′ is in the maximum inclined state. Depending on the operating conditions, the suction chamber 38a may be inclined so as to be lowered. Even in this case, the oil suction port 39a is located below the oil level S '.

  The suction passages 39b and 39c are formed so as to stand up near the intake side wall of the cylinder block 3 and the cylinder head 4.

  Furthermore, an oil filter 41 is disposed between the discharge passages 39d and 39e. The oil filter 41 has a configuration in which a filter element 41b is disposed in a case main body 41a formed integrally with the cylinder head 4, and a lid 41c is detachably attached to the opening of the case main body 41a. The discharge passage 39d communicates with the bottom of the case body 41a, and the discharge passage 39e communicates with an oil outlet 41d formed in the lid 41c.

  The discharge passage 39e communicates with the main oil hole 39f. The main oil hole 39f is formed in the bottom wall portion of the cam shaft housing portion 4d of the cylinder head 4 so as to extend in parallel with the cam shaft 31, and is disposed so as to cross a part of the holding hole 33a of the lash adjuster 33. ing. Therefore, the lubricating oil is supplied to the lash adjuster 33 through the main oil hole 39f. The supplied lubricating oil urges the lash adjuster 33 upward. A part of the lubricating oil is supplied from the oil jet 32d formed on the base 32b of the rocker arm 32 to the cam roller 32 and the cam nose 31a. It spouts toward the rolling contact part (lubricated part).

  Furthermore, one end of the main oil hole 39f communicates with a camshaft oil hole 31e formed in the shaft core of the camshaft 31 through a branch hole 39g. The camshaft oil hole 31e communicates with the sliding surface (lubricated portion) of the cam journal portion 31b through a communication hole 31f formed so as to penetrate the cam journal portion 31b in the radial direction.

  The lubricating oil pump 40 is located between the cam shaft 31 and the combustion chamber 8, that is, below the cam shaft 31. A block-like pump case 40c of the lubricating oil pump 40 is fastened and fixed to the bottom wall portion 4f of the camshaft housing portion 4d by bolts 40d. An input gear 40f is fixed to a portion of the pump shaft 40e protruding from the pump case 40c. The input gear 40f is formed on the cam shaft 31 and meshes with the pump drive gear 31f.

  The lubricating oil recovery passage 43 is configured to communicate with the lubricating oil storage chamber 38 through vertical holes 43a and 43a, horizontal holes 43b and 43b, and a merging hole 43c. The vertical holes 43a and 43a are formed so as to extend in the cylinder axial direction at both ends of the cylinder head 4 in the cam axial direction of the bottom wall 4f of the cam shaft accommodating portion 4d. The lateral holes 43b, 43b are formed to extend in the direction perpendicular to the cylinder axis on the side walls of both ends in the cam shaft direction of the cylinder block 3 following the vertical hole 43a. The merging hole 43 is formed in the intake side wall portion 3d of the cylinder block 3 so as to extend in parallel with the cam shaft, following the lateral holes 43b and 43b.

  Furthermore, a center hole 43d is formed in the bottom portion of the bottom wall 4f of the camshaft housing portion 4d below the lubricating oil pump 40 so that the center hole 43d extends downward, and the lower end of the center hole 43d is the lubricating oil. An opening is formed in the ceiling surface of the storage chamber 38.

  In the internal combustion engine 1 according to the present embodiment, the lubricating oil storage chamber 38 is provided outside the crank chamber 2a and below the cylinder head 4, and the lubricating oil storage chamber 38 and the lubricated portion of the valve gear 15 are provided. Since the oil suction port 39a of the oil supply passage 39 communicating with the oil supply passage 39 is positioned below the oil level S 'of the lubricating oil in the lubricating oil storage chamber when in the maximum inclination state, when the vehicle is suddenly braked or suddenly turned Alternatively, even when the oil level is greatly inclined as shown by S ′ when climbing or descending, the oil suction port 39a is not exposed to the air, and therefore air is not sucked.

  Further, since the lubricating oil storage chamber 38 is provided in the portion between the cylinder bores 3a, 3a adjacent to the cylinder block 3, the lubricating oil storage chamber 38 can be formed by utilizing the space between the cylinders, and the lubricating oil can be formed by the water cooling jacket 3f. The storage chamber 38 can be cooled, and abnormal temperature rise of the lubricating oil can be avoided.

  Further, the portion to be lubricated and the lubricating oil storage chamber 38 can be brought close to each other, so that the center hole 43d constituting a part of the lubricating oil recovery passage 43 can be shortened. As a result, the lubricating oil after lubrication can be quickly collected in the lubricating oil storage chamber 38 and the decrease in the oil level S can be quickly recovered, and air inhalation can also be prevented from this point.

  Furthermore, since the lubricating oil recovery passage 43 is formed so as to extend downward from both ends in the cam shaft direction of the bottom wall 4f of the cam shaft housing portion 4d, the internal combustion engine 1 is inclined in the left or right direction. Even when a centrifugal force is applied, the lubricating oil after lubrication can be quickly recovered in the lubricating oil reservoir chamber 38 to quickly recover the drop in the oil level S, and air inhalation can also be prevented from this point. .

  Further, since the lubricating oil recovery passage 43 is formed along the side wall of the cylinder head 4 and the cylinder block 4, it is easy to secure a space for arranging the lubricating oil recovery passage 43.

  Further, since the lubricating oil pump 40 is disposed in the cam chamber 30 of the cylinder head 4 and between the cam shaft 31 and the combustion chamber 8, the space between the cam shaft 31 and the combustion chamber 8 is utilized. The lubricating oil pump 40 can be arranged, and the engine can be configured compactly. Further, the lubricating oil pump 40 can be disposed close to the lubricating oil storage chamber 38, and the lubricating oil can be sucked and discharged with less power.

  In the above embodiment, the lubricating oil recovery passage 43 is formed along the side wall of the cylinder head 4 and the cylinder block 3, and the center hole 43d is lubricated in the portion between the cylinders of the bottom wall 4f of the camshaft housing portion 4d. Although formed so as to directly communicate with the oil storage chamber 38, in the present invention, the lubricating oil recovery passage may be configured by only one of the cylinder head, the side wall of the cylinder block, or the central portion.

  Moreover, in the said embodiment, although the lubricating oil storage chamber 38 was formed between the cylinder bores 3a and 3a, in this invention, a lubricating oil storage chamber can also be formed in the side wall of a cylinder block, and when doing in this way It is easy to secure a space for arranging the lubricating oil storage chamber.

  In the above embodiment, the crank chamber compression type two-cycle internal combustion engine has been described. However, the present invention can also be applied to a supercharged four-cycle internal combustion engine in which air is pressurized in the crank chamber.

1 is a cross-sectional side view of a gas fuel internal combustion engine according to an embodiment of the present invention. It is sectional drawing (II-II sectional view taken on the line of FIG. 3) of the principal part of the said internal combustion engine. It is the partial cross section side view seen from the intake side of the internal-combustion engine. FIG. 2 is a plan view of the internal combustion engine with a head cover removed. FIG. 5 is a cross-sectional front view (cross-sectional view taken along the line V-V in FIG. 3) of the valve train lubrication device for the internal combustion engine. FIG. 6 is a cross-sectional plan view (cross-sectional view taken along line VI-VI in FIG. 3) of the lubricating oil recovery passage of the internal combustion engine. It is a systematic diagram of the lubricating device of the internal combustion engine.

Explanation of symbols

1 Internal combustion engine 2a Crank chamber 3 Cylinder block 3a Cylinder bore (cylinder)
4 Cylinder Head 4b Valve Opening 8 Combustion Chamber 15 Valve Operating Device 24 Poppet Valve 31 Cam Shaft 38 Lubricating Oil Storage Chamber 39 Oil Supply Passage 39a Oil Strainer (Suction Port)
40 Lubricating oil pump 43 Lubricating oil recovery passage S 'Oil level when in the maximum inclined state

Claims (6)

In a crank chamber compression type internal combustion engine provided with a valve operating device that opens and closes a valve opening formed to open to a combustion chamber by a valve in a cylinder head,
A lubricating oil storage chamber provided outside the crank chamber and below the cylinder head;
An oil supply passage communicating the lubricating oil storage chamber and the lubricated portion of the valve gear;
A lubricating oil pump interposed in the oil supply passage and supplying the lubricating oil in the lubricating oil storage chamber to the lubricated portion;
The crank chamber compression internal combustion engine, wherein the suction port of the oil supply passage is located below the oil level of the lubricating oil in the lubricating oil storage chamber when in the maximum inclined state. The crankcase compression type internal combustion engine according to claim 1,
With multiple cylinders,
The crankcase compression type internal combustion engine, wherein the lubricating oil storage chamber is provided in a portion between adjacent cylinders of a cylinder block. The crankcase compression internal combustion engine according to claim 2,
2. A crankcase compression type internal combustion engine, wherein a lubricating oil recovery passage for recovering lubricating oil that has lubricated the portion to be lubricated in the lubricating oil storage chamber is formed in a portion between adjacent cylinders of the cylinder head. The crankcase compression type internal combustion engine according to claim 1,
The crank chamber compression type internal combustion engine, wherein the lubricating oil storage chamber is formed on a side wall of a cylinder block. The crankcase compression type internal combustion engine according to any one of claims 2 to 4,
The lubricating oil recovery passage for recovering the lubricating oil that has lubricated the lubricated portion in the lubricating oil storage chamber is formed so as to extend along the side wall of the cylinder block from the side wall at the cam shaft end of the cylinder head. Crank chamber compression internal combustion engine. The crankcase compression type internal combustion engine according to claim 1,
The crankcase compression type internal combustion engine, wherein the lubricating oil pump is disposed in the cylinder head and between a cam shaft and a combustion chamber, and is rotationally driven by the cam shaft.

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