JPH0120288B2 - - Google Patents

Abstract

PURPOSE:To distribute lubricating oil at an always appropriate ratio and prevent the excess and deficiency of the supplied quantity of the oil, by connecting the lubricating oil passages of rotating and reciprocating parts of a moving valve mechanism in parallel with an oil pump. CONSTITUTION:Lubricating oil supplied under pressure from an oil pump 53 to a main oil passage 49 is distributed into a plurality of branched oil passages 49a to lubricate the journals 4a of a crankshaft 4. Oil supplied to an oil passage 58' located at the extreme left-hand position in the drawing flows into an annular recess 63 through a communication groove so that some of the oil is conducted to the inside circumferential surface of a collar through an oil passage 64 to lubricate the extreme left-hand journal of a cam shaft 20 or the rotating part of a moving valve mechanism and the other of the oil is branched into communication grooves 66 and supplied to shaft holes to lubricate follower shafts 25.

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 As a lubricating device for an internal combustion engine, for example, three branch oil passages are extended from a main oil passage connected to an oil pump, and these branch oil passages, crankshaft and camshaft journals, and valve train systems are used. A system in which lubricating oil is supplied to the lubricated parts of the three systems by connecting the reciprocating parts of the reciprocating parts is conventionally known (see Japanese Utility Model Application Publication No. 140831/1983).

(3) Problem to be solved by the invention When an internal combustion engine is operating, the magnitude of the load that acts on the lubricated parts of the above three systems is the largest, which is applied to the journal part of the crankshaft, followed by the journal part of the camshaft. The order is as follows: those that act on the reciprocating parts of the valve train, and those that act on the reciprocating parts of the valve train.

An object of the present invention is to provide a lubricating device that can rationally supply lubricating oil to these lubricated parts depending on the magnitude of the load.

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, a plurality of communication oil passages extending from an oil pump through a plurality of journal parts of a crankshaft are branched into a first oil passage and a second oil passage. , the first oil passage is connected to a journal portion of a part of the camshaft, and the second oil passage is connected to the follower shaft, the rocker follower, the push rod,
Each of the connecting oil passages communicates with a series of oil supply passages passing through mutual contact portions of the rocker arm and the rocker shaft, and the remaining connecting oil passages communicate with the remaining journal portion of the camshaft.

(2) Function The lubricating oil pumped from the oil pump is first supplied to each journal of the crankshaft. Then, some of the oil that passes through the crankshaft journal is
The oil is distributed between the journal part of the camshaft and the above-mentioned oil supply path connected to the reciprocating part of the valve train, and the remaining oil is supplied only to the remaining journal part of the camshaft via the crankshaft journal part. be done.

(3) Embodiment Hereinafter, an embodiment of the present invention will be explained with reference to the drawings.
As shown in the figure, it is constructed by arranging two left and right cylinder rows C ₁ and C ₂ in a V-shape, each having a plurality of cylinders 1 arranged side by side.

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 the upper half circumference of the journal portion 4 a of the crankshaft 4 is supported on the lower surface of the crankcase 3 . A semi-annular bearing 41 is formed, and a bearing cap 42 supporting the lower half circumference of the journal portion 4a is joined to the lower surface of the crankcase 3, and the mating surface of the crankcase 3 and the bearing cap 42 is It is formed in one horizontal plane passing through the axis.

The bearing cap 42 includes at least one pair of long shaft bolts 43 disposed across the journal portion 4a.
and at least a pair of short shaft bolts 44 disposed on both outer sides of the long shaft bolts 43.

A piston 5 that slides into each cylinder 1 is connected to the crankshaft 4 via a connecting rod 6.

A cylinder head is fixed to each cylinder joint surface of the cylinder block 2. The cylinder head 7, cylinder block 2, and crankcase 3 constitute an engine body.

Each cylinder head 7 includes 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 opening into the main combustion chamber 8, and a main combustion chamber 9 communicating with the combustion chamber 8 via a torch nozzle 10. Exhaust port 13 and sub-intake port 1 opening into sub-combustion chamber 9
2 are formed respectively, the main intake port 11 is formed by the main intake valve 14, the auxiliary intake port 12 is formed by the auxiliary intake valve 15, and the exhaust port 13 is formed by the exhaust valve 1.
6 are opened and closed respectively. 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.

Both cylinder rows are on the top surface of cylinder block 2.
An intake manifold 18 is fixed between the cylinder heads 7 and 7 of C ₁ and C ₂ , 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, and the intake manifold 18 supplies the lean mixture to all main intake ports 11.
In addition, the rich mixture is transferred to all sub-intake ports 12.
can be distributed to each.

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

Further, a pair of left and right follower shafts 25 are arranged between the camshaft 20 and the cylinder rows C ₁ and C ₂ so as to sandwich the camshaft 20 therebetween. The exhaust follower shaft 27 is connected to each follower shaft 2.
5 as a base point and extend away from the adjacent cylinder 1, and the inner surfaces of their swinging ends engage with the intake cam 20a and the exhaust cam 20b of the camshaft 20, respectively, and their outer The inner ends of the intake push rod 30 and the exhaust push rod 31 are spherically connected to the side 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. The upper end of the exhaust valve 16 is in contact with the tip of the outer 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 inner 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 auxiliary intake valve 15, and the exhaust rocker arm 34 is not provided with such bolts. Instead, a hydraulic tappet mechanism 40 is installed inside the exhaust rocker follower 27.

Next, the lubrication system of this engine will be explained.

An oil pump 53 driven by the crankshaft 4 is installed on one side of the crankcase 3, and an oil filter 55 installed in an oil pan 54 at the bottom of the crankcase 3 is connected to the suction port of the oil pump 53.
A suction pipe 56 standing up from the pipe is connected. Then,
The oil pump 53 is designed to suck up lubricating oil stored in an oil pan 54 and supply it to the crankshaft 4 as follows.

That is, a plurality of adjacent bearing caps 42 are
As shown in FIG. 2, they are integrally connected to each other by a connecting rod 46 to constitute one bearing cap assembly Bc, and a main oil passage 49 communicating with the discharge port of the oil pump 53 is bored in this connecting rod 46. A branch oil passage 49a extending from the main oil passage 49 and reaching the lubricating part of the journal portion 4a is provided in the bearing cap 42. Therefore, from the oil pump 53 to the main oil passage 49
The lubricating oil pressure-fed is distributed to a plurality of branch oil passages 49a to lubricate the journal portion 4a of the crankshaft 4. After the lubrication, the oil reaches the peripheral surface of the crank pin 4b through an oil passage 57 formed in the crankshaft 4, and lubricates the peripheral surface of the crank pin 4b. Oil leaking from the rotating sliding surface between the crank pin 4b and the large end of the connecting rod 6 is splashed onto the inner walls of the cylinder 1 and the piston 5.

Further, a part of the oil supplied to the plurality of branch oil passages 49a is sent to the second and fifth connecting oil passages 58 and 58', which are provided in the wall of the cylinder block 2 and have the same number as the branch oil passages 49a. Since the communication oil passages 58 other than the leftmost one 58' in the figure directly communicate with the inner surface of the bearing 59 for the journal portion of the camshaft 20, the oil supplied to the communication oil passages 58 immediately lubricates the journal portion. .

On the other hand, the leftmost connecting oil passage 58' in Figures 2 and 5 is
The leftmost journal portion of the camshaft 20 in FIG. 2 communicates with each lubricating portion of the pair of follower shafts 25 in the following manner.

The bearing for the leftmost journal portion of the camshaft 20 in FIG. At the same time, the mounting flange 60a is fixed to the cylinder block 2 by the bolts 62. An annular recess 63 is formed at the outer opening edge of the shaft hole 61, and the inner circumference and outer end open surface of the annular recess 63 are connected to the cylindrical portion of the collar 60 and the flange 60.
a to form an annular oil passage, and a radial oil passage 64 communicating with this annular recess 63 is connected to the collar 60.
The oil passage 64 opens to the bearing surface of the camshaft 20 for the leftmost journal portion in FIG.

Further, from the annular recess 63, as shown in FIG.
Three radial communication grooves 65, 66 extend, one groove 65 communicating with an opening 67 of the oil passage 58' on the outer surface of the cylinder block 2, and the other two grooves 66 is a shaft hole 68 provided in the cylinder block 2 for supporting the pair of follower shafts 25.
The open surfaces of these grooves 65 and 66 are respectively closed by the flange 60a to form oil passages.

In the above, the first aspect of the present invention in which the oil passage 64 and the communication hole 66 are separated at the annular recess 63 as a branch point.
and the second oilway. Therefore, the oil supplied to the communication oil passage 58' first flows through the communication groove 6.
5 into the annular recess 63 , a part of which is sent to the inner circumferential surface of the collar 60 via an oil passage 64 to lubricate the leftmost jar portion of the cam 20 . Further, the remaining oil branches into communication grooves 66 and is supplied to shaft holes 68, respectively, to lubricate the follower shaft 25.

The oil that lubricates each journal part of the camshaft 20 is
The oil holes 7 flow into the hollow part 70 of the camshaft 20 through the oil holes 69 that open on the outer peripheral surface of the journal part, and the oil holes 7 open on the outer peripheral surfaces of the cams 20a and 20b.
1, 72, and lubricates the sliding surfaces of the cams 20a, 20b and rocker followers 26, 27.

The follower shaft 25, the intake follower shaft 2
6. Push rod 30, Lock arm 33
A series of oil supply passages 73 are formed in the rocker shaft 32 and pass through the contact portions with each adjacent member, and when a part of the oil that has finished lubricating the follower shaft 25 passes through the oil supply passages 73, it contacts the Lubricate the parts.

Also, follower shaft 25, exhaust follower shaft 2
7. The hydraulic tappet mechanism 40, the exhaust push rod, the rocker arm 34, and the rocker shaft 32 are provided with a series of oil supply passages 7 that pass through the contact portion with each adjacent member.
4 is formed, and when the remaining oil after lubricating the follower shaft 25 passes through the oil supply path 74, it lubricates the contact portion. In this way, the camshaft 20
The reciprocating parts operated by the cams 20a and 20b are lubricated.

In the figure, 50 is a head cover, 51 is an exhaust manifold, and 75 and 75' are oil flow rate adjusting orifices in the connecting oil passages 58 and 58'.

Next, to explain the operation of the engine, the camshaft 20 is rotated from the crankshaft 4 via the timing transmission 24, and when its intake and exhaust cams 20a and 20b start lifting action, the intake and exhaust rotation 26 and 27 are respectively swung upward to push up the suction and exhaust push rods 30 and 31. According to this pushing up of the intake push rod 30,
The intake rocker arm 33 swings to open the main and auxiliary intake valves 14 and 15 against the valve closing springs 35 and 36.
Further, when the exhaust push rod 31 is pushed up, the exhaust rocker arm 34 swings and the exhaust valve 1
6 is opened against the valve closing spring 37. and cam 20
When the lift action of a, 20b is finished, each valve 14,
15, 16 are respective valve closing springs 35, 36, 3
It can be closed by the elastic force of 7.

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 part of the plurality of communication oil passages extending from the oil pump through the plurality of journal parts of the crankshaft is branched into a first oil passage and a second oil passage, and the first oil passage is connected to a part of the camshaft. The second oil passage is connected to a series of oil supply passages passing through mutual contact parts of the follower shaft, rocker follower, push rod, rocker arm, and rocker shaft, and the remaining connecting oil passages are connected to the cam. The lubricating oil pumped from the oil pump is first supplied to each journal of the crankshaft, and then some of the oil that passes through the crankshaft journal is transferred to the camshaft. The remainder of the oil that has passed through the crankshaft journal is supplied only to the journal of the camshaft. Therefore, high-pressure lubricating oil can be sufficiently supplied to the crankshaft journal, which has the highest load, among the journal parts of the crankshaft and camshaft, as well as the reciprocating parts of the valve train. The above 3. It is possible to rationally supply oil to the lubricated parts of the system according to the load.

[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 head with the head cover removed, FIG. 4 is a front view of the cylinder block and crankcase assembly, and FIG. 5 is a schematic diagram of the lubricating oil path of the engine. C ₁ , C ₂ ... Cylinder, 4 ... Claim shaft, 7
...Cylinder head, 14...Intake valve, 16...
Exhaust valve, 20... camshaft, 25... follower shaft,
26, 27... Lock follower, 30, 31...
Pushrod, 32... Rotka axis, 33, 34
...Lotsuka arm, 53...Oil pump, 58;5
8'... Connecting oilway, 64... First oilway, 66...
2nd oil passage, 73, 74...Oil supply passage, 75, 75'
...Orifice chair.

Claims (1)

[Claims] 1. A camshaft 20 interlocked with the crankshaft 4 is disposed on one side of the cylinders C ₁ and C ₂ , and a follower shaft 25 disposed adjacent to the camshaft 20 is provided with the camshaft 20 .
rocker follower 26, 27 that engages with
Push rods 30 and 3 are connected between rocker arms 33 and 34 which are pivotally supported on a rocker shaft 32 on the cylinder head 7 and are linked to the intake valve 14 or the exhaust valve 16.
1, a part 58' of a plurality of communication oil passages 58...; 58' extending from the oil pump 53 through a plurality of journal parts of the crankshaft 4 is connected to the first oil passage 64. The first oil passage 64 is branched into a journal portion of a part of the camshaft 20, and the second oil passage 66 is connected to the follower shaft 25, the rocker followers 26, 27, the push rod 30, 31, Rotsuka arm 33,3
4 and a series of oil supply passages 73 and 74 that pass through mutual contact portions of the rocker shaft 32, respectively, and the remaining communication oil passages 58... are further communicated with the remaining journal portion of the camshaft 20. and
Lubrication system in internal combustion engines. 2. The lubricating device for an internal combustion engine according to claim 1, wherein each of the communicating oil passages 58..., 58' is provided with an oil amount adjusting orifice 75..., 75', respectively.