JPH0120290B2 - - Google Patents

Abstract

PURPOSE:To ensure the lubrication of each part of a moving valve mechanism through a simple construction, by providing a series of lubricating oil supply passages which extend through the mutual contact portions of the cnstituent elements of the moving valve mechanism and by connecting the oil passages to an oil pump. CONSTITUTION:An oil pump sucks up lubricating oil from an oil pump 54 and supplies some of the oil to the oil hole 57 of a follower shaft 25. The lubricating oil flowing through a series of oil supply passages 64 made of oil holes 57-63 lubricates the mutual contact parts of the follower shaft 25, an intake rocker follower 26, a push rod 30, a rocker 33 and a rocker shaft 32 while an appropriate quantity of the oil is leaking from the mutual contact parts. The lubricating oil flowing through a series of oil passages 70 made of oil holes 57, 58, 65, 67- 69, the first oil chamber 44 and an oil leakage gap 66 lubricates the mutual contact parts of the follower shaft 25, an exhaust rocker follower 27, tappets, a push rod 31, a rocker arm 34 and the rocker shaft 32 while an appropriate quantity of the oil is leaking from the mutual contact parts.

Description

[Detailed Description of the Invention] A. Purpose of the Invention (1) Industrial Field of Application The present invention provides an internal combustion engine, in particular, a camshaft that is interlocked with the crankshaft, is disposed on one side of the cylinder, and is adjacent to the camshaft. A rocker follower that engages with the camshaft is pivotally supported on a follower shaft arranged at The present invention relates to a lubrication system for an internal combustion engine in which the engine is connected via a push rod.

(2) Prior Art Conventionally, a camshaft that is linked to the crankshaft is disposed on one side of the cylinder, and this camshaft and a rocker arm that is pivotally supported by a rocker shaft on the cylinder head and that is linked to the intake valve or exhaust valve. In an internal combustion engine, the main oil passage connected to the oil pump, which is drilled in the engine body, and the push rod are connected to each other through a sliding part of a tapepet as a cam follower that contacts the camshaft. There are well-known devices that communicate with the inner fuel supply passage (for example, Japanese Unexamined Patent Publication No. 59147/1983, Japanese Utility Model Publication No. 55/1983).
(See Publication No. 125903).

(3) Problems to be Solved by the Invention In the above conventional device, the tappet as a cam follower is a sliding type, and lubricating oil easily leaks from the sliding part, and lubricating oil leaks from the main oil passage through the tappet and push rod. It is necessary to specially form an oil supply path exclusively for lubrication leading to the rocker arm.

The present invention has been proposed in view of the above, and has a simple structure in which there is little leakage of lubricating oil from the cam follower, and the hydraulic oil chamber and oil leakage gap of the hydraulic tappet mechanism can be used as part of the oil supply path. The object of the present invention is to provide a lubricating device for an internal combustion engine.

B. Structure of the Invention (1) Means for Solving the Problems In order to achieve the above object, according to the present invention, a camshaft that interlocks with the crankshaft is disposed on one side of the cylinder, and a camshaft that is adjacent to the camshaft is disposed on one side of the cylinder. A rocker follower that engages with the camshaft is pivotally supported on a follower shaft arranged at In an internal combustion engine, the follower shaft, the rocker follower, the push rod, the rocker arm, and the rocker shaft are provided with a series of oil supply passages passing through their mutual contact portions, and this oil supply passage. One end of the follower shaft side is communicated with an oil pump, and the rocker follower is equipped with a hydraulic tappet mechanism. is communicated with the oil supply passage in the rocker follower, and the oil leakage gap is communicated with the oil supply passage in the push rod.

(2) Effect The rocking rocker follower rotates and slides around the follower axis, and the amount of sliding is small, so the amount of lubricant that leaks from the oil supply path through the rotating and sliding portion is small.

Furthermore, the lubricating oil flowing through the oil supply passage in the rocker follower flows to the oil supply passage within the push rod via the hydraulic oil chamber of the hydraulic tappet mechanism and the oil leakage gap.

(3) Embodiment Hereinafter, an embodiment of the present invention will be described with reference to the drawings. The internal combustion engine shown in FIGS. 1 to 3 has two left and right cylinder rows C ₁ and C ₂ each having a plurality of cylinders 1 arranged in parallel. are arranged in a V-shape to form a V-type multi-cylinder internal combustion engine. A common crankcase 3 is integrally connected to the lower ends of the cylinder blocks 2 of both cylinder rows C ₁ and C ₂ , and a piston that slides into each cylinder 1 is attached to a crankshaft 4 supported by this crankcase 3. 5 are connected via connecting rod 6.

Each cylinder head 7 of cylinder rows C ₁ and C ₂ has the following:
A main combustion chamber 8 defined by the piston 5, a sub-combustion chamber 9 communicating with the combustion chamber 8 via a torch nozzle 10, a main intake port 11 and an exhaust port 13 that open to the main combustion chamber 8, and a sub-combustion chamber 9 that communicates with the combustion chamber 8 via a torch nozzle 10. A sub-intake port 12 that opens into the chamber 9 is formed, and the main intake port 11 is opened and closed by a main intake valve 14, the sub-intake port 12 is opened and closed by a sub-intake valve 15, and the exhaust port 13 is opened and closed by an exhaust valve 16. Ru. These valves 14, 15, 16 are attached with valve closing springs 35, 36, 37 that bias them in the closing direction.

An ignition plug 17 screwed onto the cylinder head 7 has an electrode facing the auxiliary combustion chamber 9.

Cylinder heads 7, 7 of both cylinder rows C ₁ and C ₂
An intake manifold 18 is installed between them, and a carburetor 19 is attached to the upper surface of the intake manifold 18. The carburetor 19 can simultaneously generate a lean mixture and a rich mixture,
The intake manifold 18 can distribute the lean mixture to all the main intake ports 11 and the rich mixture to all the auxiliary intake ports 12, respectively.

A camshaft 20 is disposed in the center between both cylinder rows C ₁ and C ₂ as close as possible to the crankshaft 4 . This camshaft 20 is supported by a cylinder block 2, and a timing transmission device 24 comprising a pair of gears 21, 22 and a chain 23 suspended between them.
The motor is linked to the crankshaft 4 via the motor, and is then driven at a reduction ratio of 1/2.

Further, a pair of left and right follower shafts 25 are disposed between the camshaft 20 and each of the cylinder rows C ₁ and C ₂ so as to sandwich the camshaft 20 . The engine rocker follower 26 and the exhaust rocker follower 27 extend away from the adjacent cylinders 1 from the respective follower shafts 25, and the inner surfaces of their swinging ends are connected to the intake cam 20a of the camshaft 20. and exhaust cam 20b, and the inner ends of intake push rod 30 and exhaust push rod 31 are spherically connected to their outer surfaces.

On the other hand, an intake rocker arm 33 and an exhaust rocker arm 34 are pivotally supported on the rocker shaft 32 supported by each cylinder head 7. The upper ends of the main intake valve 14 and the auxiliary intake valve 15 abut on the intermediate portion, and the outer end of the intake push rod 30 is spherically connected to the tip of the outer arm of the rocker arm 33. Further, the upper end of the exhaust valve 16 contacts the tip of the inner arm of the exhaust rocker arm 34, and the outer end of the exhaust push rod 31 is spherically connected to the tip of the outer arm of the rocker arm 34. The intake rocker arm 33 is provided with valve head gap adjustment bolts 38 and 39 at the spherical joint with the push rod 30 and at the contact portion with the sub-intake valve 15, and the exhaust rocker arm 34 is not provided with such bolts. However, instead, a hydraulic tappet mechanism 40 is installed in the exhaust rocker follower 27 as follows.

As clearly shown in FIG. 4, the exhaust rocker follower 27 has at its tip a hydraulic cylinder 41 whose axis is in the direction of its swing, into which pistons 42 and 43 divided into upper and lower halves are slidably connected.
The inner end of the push rod 31 is connected to the spherical surface.
A first hydraulic oil chamber 44 is provided between both pistons 42 and 43.
However, the lower piston 43 and hydraulic cylinder 41
A second hydraulic oil chamber 45 that communicates with the first hydraulic oil chamber 44 via a valve hole 46 is formed between the bottom of the lower piston 43 and the bottom of the lower piston 43 .
The spring 47 springs the valve hole 46 upward, and the spring 4 springs the valve hole 46 upward.
A check valve 48 that closes with a biasing force of
Lubricating oil for the engine is supplied via 5.

Therefore, the exhaust roller lower 27 is connected to the cam 20.
When in contact with b on the base circle, the piston 42,
43 is pushed up by the elastic force of the spring 47 to make the valve head gap of the exhaust valve 16 zero, and accordingly, the check valve 48 opens and the oil in the first hydraulic oil chamber 44 fills the second hydraulic oil chamber 45. . When the lift action of the cam 20b starts, the check valve 48 closes and the second hydraulic oil chamber 4
5 increases, the pistons 42 and 43 swing together with the rocker follower 27, and the push rod 31
can push up.

An oil pump 53 driven by the crankshaft 4 is installed on one side of the crankcase 3, and an oil filter 5 installed at the bottom of an oil pan 54 at the bottom of the crankcase 3 is connected to the suction port of this oil pump 53.
A suction pipe 56 standing up from 5 is connected. The oil pump 53 sucks up lubricating oil stored in the oil pan 54 and supplies it to each part of the engine to lubricate each part, but only the lubrication of the valve mechanism will be described here.

As shown in FIG. 1, the follower shaft 25 is provided with an oil hole 57 passing through its axial center, and a plurality of oil holes 58 extending radially from the oil hole 57 and opening on the outer peripheral surface. 57 is supplied with lubricating oil from the oil pump 53. Further, the intake rocker follower 26 is provided with an oil hole 59 that communicates its bearing surface with a connecting surface to the intake push rod 30.
0 is provided with an oil hole 60 that communicates both the connecting surfaces with the rocker follower 26 and the rocker arm 33 through its axial center, and most of the oil hole 60 is formed in the hollow part of the metal pipe rod-shaped part of the push rod 30. configured. Further, the intake rocker arm 33 is provided with an oil hole 61 that communicates between its bearing surface and the connecting surface to the push rod 30.
has an oil hole 62 passing through its axial center, and a plurality of oil holes 63 extending radially from the oil hole 62 and opening on the outer peripheral surface.
The oil holes 57 to 63 allow the follower shaft 25, rocker follower 26, push rod 30, rocker arm 33, and rocker shaft 32 to be
A series of oil supply passages 64 are constructed through the mutual contact portions of the .

On the other hand, the exhaust rocker follower 27 is provided with an oil hole 65 that communicates between the oil hole 58 of the follower shaft 25 and the first hydraulic oil chamber 44 of the hydraulic tappet mechanism 40, as shown in FIG. for,
An oil hole 67 is provided which communicates the oil leakage gap 66 between the hydraulic cylinder 41 and the connecting surface to the exhaust push rod 31, and the exhaust push rod 31 and the rocker arm 34 are provided with an oil hole 68 similar to that for the intake. 69 is provided, and the oil hole 69 communicates with the oil hole 63 of the rocker shaft 32. The oil holes 57, 58, 65, 67 to 69, the first hydraulic oil chamber 44, and the oil leakage gap 66 are connected to the follower shaft 2.
5. A series of oil supply passages 70 are formed that pass through the mutual contact portions of the rocker follower 27, the push rod 31, and the rocker shaft 32.

In the figure, 50 is a head cover, and 51 is an exhaust manifold connected to the exhaust port 13.

Next, to explain the operation of this embodiment, the camshaft 20 is rotated from the crankshaft 4 via the timing transmission 24, and the intake and exhaust cams 20a and 20b of the camshaft 20 are rotated from the crankshaft 4 via the timing transmission 24.
When the lift action starts, the suction and exhaust rocker followers 26 and 27 are respectively swung upward and push up the suction and exhaust push rods 30 and 31. When the intake push rod 30 is pushed up, the intake rocker arm 33 swings and the main
When the auxiliary intake valves 14 and 15 are opened against the valve closing springs 35 and 36, and when the exhaust push rod 31 is pushed up, the exhaust rocker arm 34 swings to open the exhaust valve 16 against the valve closing spring 37. Open it. Then, when the lifting action of the cams 20a, 20b is finished, each valve 14, 15, 16 is released by its respective valve closing spring 35,
It can be closed by the elastic force of 36 and 37.

During this time, the oil pump 53 sucks up lubricating oil from the oil pan 54 and supplies a portion of it to the oil hole 57 of the follower shaft 25. As a result, the lubricating oil passing through the oil supply path 64 leaks an appropriate amount from the mutual contact portions of the follower shaft 25, intake rocker follower 26, push rod 30, rocker arm 33, and rocker shaft 32, lubricating each contact surface, and also lubricates each contact surface. The lubricating oil passing through 70 also leaks in an appropriate amount from the mutual contact portions of the follower shaft 25, the exhaust rocker follower 27, the tappet 42, the push rod 31, the rocker arm 34, and the rocker shaft 32, lubricating each contact surface. All the oil that has been lubricated returns to the oil pan 54.

When the main and auxiliary intake valves 14 and 15 are opened, this corresponds to the intake stroke of the piston 5 in the corresponding cylinder 1, so that the lean mixture passes through the main intake port 11 and enters the main combustion chamber 8, and the rich mixture Air is supplied to the sub-combustion chambers 9 through the sub-intake ports 12, respectively. Then, in the next compression stroke, the rich mixture in the auxiliary combustion chamber 9 is ignited by the discharge of the spark plug 17, and the flame is injected into the main combustion chamber 8 through the torch nozzle 10, igniting the lean mixture in the chamber 8. Ignite and burn. As a result, combustion of a mixture with a lean overall air-fuel ratio becomes possible. In this way, the piston 5 moves to the expansion stroke, and in the next exhaust stroke, the exhaust valve 16 is opened as described above, so that the burned gas flows into the exhaust port 1.
It is discharged to 3.

C. Effects of the Invention As described above, according to the present invention, a camshaft interlocking with the crankshaft is disposed on one side of the cylinder, and a follower shaft disposed adjacent to the camshaft is engaged with the camshaft. In an internal combustion engine, a rocker follower is swingably supported, and the rocker follower and a rocker arm, which is pivotally supported on a rocker shaft on a cylinder head and is linked to an intake valve or an exhaust valve, are connected via a push rod. A series of oil supply passages are drilled through the follower shaft, the rocker follower, the push rod, the rocker arm, and the rocker shaft through their mutual contact portions, and one end of the oil supply passage on the follower shaft side is communicated with an oil pump. ,
The rock follower is equipped with a hydraulic tappet mechanism,
In order to make the hydraulic oil chamber and oil leakage gap of this tappet mechanism function as a part of the oil supply passage, the hydraulic oil chamber is connected to the oil supply passage in the rocker follower, and the oil leakage gap is connected to the oil supply passage in the push rod. The rocker follower rotates and slides around the follower axis.
The amount of sliding is small, and therefore the amount of lubricating oil leaking from the oil supply path through the rotating sliding portion can be reduced and the lubrication efficiency can be increased. In addition, the hydraulic oil supplied to the hydraulic tappet mechanism can be used as is for lubricating the valve system from the camshaft to the rocker arm, and the hydraulic oil chamber and oil leakage gap of the hydraulic tappet mechanism can be used as is in the oil supply path. Since it can be used as a part, the structure of the device can be simplified and the cost can be reduced.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional front view of a V-type multi-cylinder internal combustion engine equipped with the device of the present invention, FIG. 2 is a longitudinal cross-sectional side view thereof, and FIG.
The figure is an enlarged plan view of one cylinder row with the head cover removed, and FIG. 4 is an enlarged longitudinal sectional view of the exhaust rocker follower having a hydraulic tappet mechanism. 1... Cylinder, 4... Crankshaft, 7... Cylinder head, 14... Intake valve, 16... Exhaust valve, 20... Camshaft, 25... Follower shaft, 2
6, 27...Rotsuka follower, 30, 31...Pushy rod, 32...Rotsuka axis, 33,34...
...Rotsuka arm, 40...Hydraulic tappet mechanism, 4
4... Hydraulic oil chamber, 53... Oil pump, 64, 70
...Oil supply path, 66...Oil leakage gap.

Claims (1)

[Claims] 1. A camshaft 20 that interlocks with the crankshaft 4 is disposed on one side of the cylinder 1, and rocker followers 26 and 27 that engage with the camshaft 20 are rocked to a follower shaft 25 that is disposed adjacent to the camshaft 20. A rocker arm 3 is movably supported, and is pivotally supported by the rocker followers 26 and 27 and a rocker shaft 32 on the cylinder head 7 to interlock with the intake valve 14 or the exhaust valve 16.
3, 34 are connected via push rods 30, 31, the follower shaft 25, rocker followers 26, 27, push rods 30, 31, rocker arms 33, 34, and rocker shaft 32 have A series of oil supply passages 64 and 70 passing through the mutual contact portion are drilled, and one end of the oil supply passages 64 and 70 on the follower shaft 25 side is communicated with the oil pump 53, and the oil supply passages 64 and 70 are connected to the oil pump 53.
6 and 27 are equipped with a hydraulic tappet mechanism 40, and a hydraulic oil chamber 44 and an oil leakage gap 66 of this tappet mechanism 40 are provided.
In order to function as a part of the oil supply passages 64 and 70, the hydraulic oil chamber 44 is connected to the oil supply passages 64 and 70.
6, 27, and the oil leakage gap 66 is communicated with the oil supply passages 64, 70 in the push rods 30, 31, respectively.