JP2004137999A - Lubricating device of valve gear - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve the lubricity to lubrication-required portions in a rocker box, by devising the configuration of an oil groove formed in a rocker arm and the shape of a valve bridge, and devising the lubrication structure in the rocker box. <P>SOLUTION: In the lubricating device of a valve gear in which the rocker arm 8 is rotatably supported by a rocker arm shaft 6 extended horizontally on a cylinder head 2 of an engine 1 so as to supply the lubrication oil from the rocker arm 8, a lubrication oil sump 36 which receives the lubrication oil from the rocker arm 8 is formed at an upper portion of the valve gear, and the lubrication oil is supplied from the lubrication oil sump 36 to valves or the like. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a lubrication structure for a valve train that transmits power between an intake valve or an exhaust valve of an internal combustion engine and a camshaft.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, a technique for maintaining a smooth flow of lubricating oil and oil mist in a valve arm chamber of an engine has been proposed and known by the present applicant (see Patent Document 1).
In general, the valve arm chamber is filled with oil mist, and the oil mist is used to lubricate various parts of the valve arm chamber. And the push rod side, that is, each connection portion between the both ends of the valve arm and the upper end of the valve rod (valve bridge if a valve bridge is provided), the upper end of the push rod, and the like. In these connection portions, an oil groove is formed on the upper surface of the valve arm from the center of the valve arm to both ends of the valve arm, and the lubricating oil overflowing from a lubricating oil passage formed in the valve arm shaft forms the oil groove. I am trying to be supplied.
[0003]
[Patent Document 1]
Japanese Patent Application Laid-Open No. 2001-140620
[Problems to be solved by the invention]
However, in the related art, the lubricating oil discharged from the outlet of the lubricating oil supply hole in the upper surface of the valve arm passes through the lubricating oil passage in the valve arm shaft and travels through the oil groove formed in the upper surface of the valve arm. However, not all of the lubricating oil is supplied to each connecting part through the oil groove, and part of the lubricant flows down to both sides of the valve arm in the short direction. I was Therefore, the lubricating oil that has flowed down is wasted, and sufficient lubricating oil is not supplied to each connecting portion, which may cause a decrease in lubricity.
Therefore, the present invention improves the lubricating properties of the valve arm chamber where lubrication is required by devising the shape of the oil groove formed in the valve arm, the shape of the valve bridge, and the lubrication structure in the valve arm chamber. What you are trying to do.
[0005]
[Means for Solving the Problems]
The problem to be solved by the present invention is as described above. Next, means for solving the problem will be described.
[0006]
That is, in the lubricating device of the valve mechanism, the valve arm is rotatably supported on a valve arm shaft transversely mounted on a cylinder head of the engine and lubricating oil is supplied from the valve arm. A lubricating oil reservoir for receiving lubricating oil from a valve arm is formed above the valve mechanism, and lubricating oil is supplied from the lubricating oil reservoir to a valve or the like.
[0007]
The lubricating device according to claim 2, wherein the valve arm is rotatably supported on a valve arm shaft transversely mounted on a cylinder head of the engine and lubricating oil is supplied from the valve arm. The lubricating oil supply hole is provided with an outlet portion, a lubricating oil reservoir is formed at the outlet portion, and the lubricating oil reservoir communicates with an oil groove formed in the valve arm.
[0008]
According to a third aspect of the present invention, in a lubricating device for a valve operating mechanism for rotatably supporting a valve arm on a valve arm shaft transversely mounted on a cylinder head of an engine and supplying lubricating oil from the valve arm, A valve bridge is disposed at an end portion, a lubricating oil reservoir is formed on an upper surface of the valve bridge, and the lubricating oil reservoir and a lubricating oil hole for supplying lubricating oil to a sliding portion between the valve bridge and the valve guide are formed. It is a communication.
[0009]
BEST MODE FOR CARRYING OUT THE INVENTION
Next, an embodiment of the invention will be described.
FIG. 1 is a partial cross-sectional side view of an engine to which the present invention is applied, FIG. 2 is a plan view showing a valve arm according to the present invention, FIG. 3 is a side view, FIG. It is BB sectional drawing.
FIG. 6 is a partial side sectional view showing an embodiment of a valve train to which the present invention is applied, FIG. 7 is a partial side sectional view showing another embodiment of a valve train to which the present invention is applied, and FIG. FIG. 9 is a plan view showing a lid body, FIG. 10 is a plan view showing a conventional valve arm, FIG. 11 is a side view thereof, FIG. 12 is a cross-sectional view of A′-A ′, and FIG. -B 'sectional drawing.
[0010]
The configuration of the valve train of the engine according to the present invention will be described.
Note that the engine in the present embodiment is a so-called four-valve engine in which, for example, three cylinders are provided, and two intake valves and two exhaust valves are provided for each cylinder.
FIG. 1 shows an engine 1 according to the present invention, in which a cylinder head 2 is fastened to an upper surface of a cylinder block 3 by bolts or the like, and a valve arm chamber cover 4 is fastened and covered above the cylinder head 2. Thus, the valve arm chamber 5 is formed.
In the valve arm chamber 5, a valve arm shaft 6 is suspended above the cylinder head 2 and is fixed so as not to rotate and not move in the axial direction.
A valve arm 8 is swingably supported by the valve arm shaft 6. The upper end of the push rod 7 is inserted into one end of the valve arm 8, and the position is adjusted and fixed by an adjusting screw 9. . At the other end of the valve arm 8, a pressing portion 8a for pressing from above is formed, and the pressing portion 8a is in contact with a pressed portion 15 formed substantially at the center of the upper portion of the valve bridge 10. The push rod 7 extends into a lower crankcase through a push rod insertion hole 44 formed in the cylinder head 2 in a vertical direction, and is connected to a camshaft via a tappet or the like.
[0011]
As shown in FIG. 6, the distal end pressing portion 8a of the valve arm 8 comes into contact with the central pressed portion 15 of the valve bridge 10 from above, and the valve bridge 10 has a peak shape with the pressed portion 15 as a top. A pipe-shaped guide portion 14 into which a cylindrical valve guide 13 is inserted is formed integrally with the pressed portion 15 below the pressed portion 15 in the vertical direction. I have.
At one end of the valve bridge 10, a screw hole 19 is opened in a vertical direction, and an adjusting screw 11 a formed at the upper end of the valve rod 11 is screwed into the screw hole 19. The adjusting screw 11a is fixed at a predetermined projecting position by a lock nut 22. A valve body (valve) is formed below the valve stem 11. A screw hole 24 is formed at the other end of the valve bridge 10, and a screw portion 11b formed at the upper end of the valve rod 11 is screwed and fixed.
A lubricating oil reservoir 37 described later is formed on the upper slope 25 of the valve bridge 10 on the adjusting screw 11a side, and a sliding portion between the guide portion 14 and the valve guide 13 from the bottom of the lubricating oil reservoir 37. A lubricating oil hole 26 is formed which communicates with the lubricating oil hole 26.
[0012]
A spring receiving seat 16 is fixed to the upper portion of the valve stem 11 and a cylindrical receiving member 17 is inserted therein. The valve is closed by urging the valve stem 11 upward by a valve spring 18. ing.
[0013]
The valve guide 13 is formed of a rod having a circular shape in cross section and is erected integrally with the cylinder head 2, and has an upper part slidable in the axial direction on a guide part 14 provided in the valve bridge 10. Has been inserted. Then, lubricating oil is supplied to the sliding portion from the lubricating oil hole 26.
[0014]
That is, when the other end of the valve arm 8 is pushed up by the push rod 7, the valve arm 8 swings in a seesaw shape around the valve arm shaft 6, and the pressing portion 8a of the valve arm 8 The pressed part 15 is pushed down. The valve bridge 10 is lowered by this pressing down, and the valve rods 11 are lowered against the valve spring 18 to open the intake valve (or the exhaust valve). Thus, the valve bridge 10 moves up and down along the axial direction of the valve guide 13.
[0015]
Next, the lubricating oil supply path will be described with reference to FIG.
The lubricating oil scooped up in the crank chamber exists in the valve arm chamber 5 as an oil mist. On the other hand, the lubricating oil pumped from an oil pump (not shown) is supplied to the lubricating oil passage in the cylinder head 2 through the lubricating oil passage in the cylinder block 3, and the conical lubricating oil passage in the shaft support leg 31. After being pressurized at 32, it is supplied to a lubricating oil passage 33 in the valve arm shaft 6.
Part of the lubricating oil in the lubricating oil passage 33 passes through a communication hole formed at the lower end of the lubricating oil passage 33 to lubricate the fitting portion between the valve arm shaft 6 and the shaft support leg 31, and the remaining lubricating oil Flows into a lubricating oil supply hole 46 formed in the valve arm 8 of each cylinder, and is discharged from an outlet 46 a of the lubricating oil supply hole 46 by the discharge pressure of the oil pump and the pressurization by the conical lubricating oil passage 32. Then, the oil is supplied to each connecting portion on the valve side and the push rod side through the oil groove 35 formed on the upper surface of the valve arm 8.
[0016]
As shown in FIGS. 10 to 13, in the conventional valve arm 108, the lubricating oil passing through a lubricating oil passage 133 formed in the valve arm shaft 106 coaxially with the valve arm shaft 106 is supplied to the valve arm 108. Through a lubricating oil supply hole 146 formed vertically upward with the lubricating oil passage 133 at a substantially central portion in the longitudinal direction, and discharged from an outlet 146 a above the lubricating oil supply hole 146. The oil is supplied to each connecting portion along oil grooves 135a and 135b formed toward both ends of the valve arm 108. However, the lubricating oil discharged from the lubricating oil supply hole 146 flows into the oil grooves 135a and 135b from the outlet 146a, or the excessively supplied lubricating oil overflows from the oil grooves 135a and 135b. Then, the lubricating oil flows down to both sides in the short direction of the valve arm 108, and the lubricating oil is not used for lubrication at the lubricating portion, and the lubricating efficiency is not good.
[0017]
Therefore, in this embodiment, as shown in FIGS. 2 to 5, a lubricating oil reservoir 36, which is a substantially circular depression in a plan view, is formed at the outlet 46 a of the lubricating oil supply hole 46, and communicates with the oil groove 35. On the upper surface of the valve arm 8, the lubricating oil reservoir 36 and the oil groove 35 are formed as one continuous groove.
By forming the lubricating oil sump 36 and communicating with the oil groove 35 in this manner, the lubricating oil discharged to the outlet 46a of the lubricating oil supply hole 46 temporarily accumulates in the lubricating oil sump 36, and then the oil groove Since the lubricating oil is supplied to each connecting portion along the valve arm 35, it is possible to prevent the lubricating oil from flowing down on both sides in the short direction of the valve arm 8, and to lubricate the connecting portions on both the valve side and the push rod side at both ends of the valve arm 8. The performance is improved. Further, a stable lubricating oil injection amount can be secured.
[0018]
Next, an embodiment of the valve bridge 10 according to the present invention will be described with reference to FIG.
A lubricating oil hole 26 is formed in the slope 25 of the valve bridge 10 on the adjustment screw 11a side to supply lubricating oil to the sliding surface between the guide portion 14 and the valve guide 13 of the valve bridge 10 conventionally. ing. However, when the lubricating oil hole 26 is formed, drilling is performed directly from the inclined surface 25 of the valve bridge 10. In some cases, the amount of lubricating oil flowing from the upper surface of the lubricating oil flows downward along the slope 25, and the lubricating oil supplied to the sliding surface may be insufficient.
[0019]
Therefore, in the present embodiment, a depression is formed as the lubricating oil reservoir 37 in the slope 25, and the lubricating oil reservoir 37 and the lubricating oil hole 26 are communicated.
Thus, by providing the lubricating oil sump 37 on the slope 25 of the valve bridge 10, the lubricating oil flowing down from the valve arm 8 is transmitted through the slope 25, temporarily stored in the lubricating oil sump 37, and then The lubricating oil overflowing from the lubricating oil sump 37 is supplied to the lower connecting portion, and a constant amount of lubricating oil is always supplied to the lubricating oil hole 26, so that the guide portion 14 and the valve guide 13 of the valve bridge 10 The lubrication of the sliding surface is improved. Therefore, seizure of the sliding surface can be prevented, and the durability of components related to the sliding surface can be improved.
[0020]
Next, as another embodiment of the valve bridge 10 according to the present invention, a structure in which the shape of the valve bridge 10 is devised to improve the lubricity and reduce the wear of the sliding portion of the valve rod 11 will be described with reference to FIGS. This will be described with reference to FIG.
As described above, the adjustment screw 11a is provided on one side of the valve bridge 10, and the rib portion 38 is provided on the upper surface of the valve bridge 10 on the adjustment screw 11a side as a reinforcement. The portion 38 is an inclined surface that descends toward the valve. In other words, since the valve arm 8 and the valve bridge 10 are disposed in a bent shape in a “C” shape in plan view, if they flow down from the rib portion 38 as they are, they will largely drop to the side away from the valve. Therefore, the upper surface of the rib portion 38 is formed as a slope descending to the inside (enclosed side) of the “ku” shape, so that the lubricating oil flowing down from the valve arm 8 travels along the upper surface of the rib portion 38 of the valve bridge 10. The fluid flows to the adjustment screw 11a side and the valve guide 13 side of the valve bridge 10, and the lubricity is improved. Further, the drill hole provided in the valve guide 13 can be omitted. In this embodiment, as shown in FIG. 8, the rib portion 38 of the valve bridge 10 is tapered toward the adjusting screw 11a to such an extent that the strength in the thickness direction is not hindered, so that it easily flows down on the valve side. are doing.
7 and 8, the axial position O1 of the adjusting screw 11a formed on the valve bridge 10 and the axial position O2 of the boss 39 of the adjusting screw 11a are defined in the longitudinal direction of the valve bridge 10. It is configured to be eccentric. In this manner, the lubricating oil that has flowed down from the valve arm 8 due to the inclination or step formed at the connecting portion 41 between the boss portion 39 and the rib portion 38 is separated from the connecting portion 41 to the valve side and falls, and the lubricating property is improved. Can be improved.
[0021]
By forming the valve bridge 10 in such a shape, the lubricating oil is supplied to the valve guide 13 by providing a lubricating oil hole by drilling or the like in the valve bridge 10 in the past, but such an oil hole is provided. There is no need to supply more lubricating oil to the adjustment screw 11a side of the valve bridge 10, so that lubricity is improved and wear of the valve rod 11 can be reduced.
[0022]
Further, as shown in FIG. 1, a lid 40 is provided at an upper portion of the valve arm chamber 5.
The lid body 40 forms a space between itself and the valve arm chamber cover 4, communicates with the lubricating oil passage, and guides the lubricating oil to above the valve element. The cylinder block 3, the cylinder head 2, the valve arm Lubricating oil passages 3a, 29, and 42 are respectively formed above and communicate with the chamber cover 4, and an outlet portion 42a at the upper end of the lubricating oil passage 42 formed in the valve arm chamber cover 4 is opened at an upper portion of the valve arm chamber 5. ing. One end of the lid 40 is fixed below the outlet portion 42a, and the other end of the lid 40 projects downward from the other end of the upper surface of the valve arm chamber cover 4 inside the valve arm chamber 5 below. A space 43 is formed between the lid body 40 and the upper wall of the valve arm chamber cover 4 by bolts 47 or the like, and the space 43 is disposed so that the outlet 42a faces the space 43. .
As shown in FIG. 9, the lid 40 is a plate-like member having a substantially rectangular shape in plan view and adapted to the shape of the valve arm chamber cover 4, and has holes 40a at predetermined positions. Has been drilled. The shape of the holes 40a, the positions and numbers of the holes 40a are arbitrary, and are not limited.
[0023]
That is, the holes 40a, 40a,... Are arbitrarily provided above the locations where lubricating oil is required, and the lubricating oil that has flowed up the lubricating oil passage 29 in the cylinder head 2 is not covered by the valve arm chamber cover. 4 flows into the lubricating oil passage 42 formed by the pressure of the oil pump, is discharged from the outlet 42 a of the lubricating oil passage 42, and has a space 43 between the lid 40 and the upper wall of the valve arm chamber cover 4. , And drip from each of the holes 40a, 40a,.
[0024]
Conventionally, the lubricating oil is ejected from the upper surface of the valve arm 8 through a lubricating oil passage formed in the valve arm shaft 6 to fly or drip through an oil groove. Is short of lubrication, seizure occurs at each connecting part, and the wear of parts is large. At high rotation, conversely, the amount of lubrication increases and the oil mist in the valve arm chamber 5 becomes excessive. , Uneven lubrication occurred.
However, by providing the lid 40 in this manner, even when the engine is running at a low speed, the lubricating oil flows up from the lubricating oil passage 42 formed in the valve arm chamber cover 4 and the hole of the lid 40 is formed. Lubricating oil can be supplied stably by dripping from the parts 40a. That is, the structure is such that a constant amount of lubrication can be ensured irrespective of the engine speed.
Further, by providing the cover 40 above the valve arm chamber 5, the cover 40 functions as a shield plate, so that sound radiated to the upper surface of the engine can be reduced, and a noise prevention effect can be obtained.
[0025]
【The invention's effect】
The present invention is configured as described above, and has the following effects.
[0026]
That is, as set forth in claim 1, in a lubricating device for a valve operating mechanism that rotatably supports a valve arm on a valve arm shaft transversely mounted on a cylinder head of an engine and supplies lubricating oil from the valve arm, A lubricating oil reservoir for receiving lubricating oil from a valve arm is formed at an upper portion of the valve operating mechanism, and the lubricating oil is supplied from the lubricating oil reservoir to a valve or the like. Stable lubricity can be obtained.
[0027]
3. A lubricating device for a valve operating mechanism for rotatably supporting a valve arm on a valve arm shaft transversely mounted on a cylinder head of an engine and supplying lubricating oil from the valve arm. An outlet portion of the lubricating oil supply hole was provided at the upper portion, a lubricating oil reservoir was formed at the outlet portion, and the lubricating oil reservoir was connected to an oil groove formed in the valve arm, so that the lubricating oil reservoir was formed in the valve arm shaft. The lubricating oil discharged from the lubricating oil passage to the outlet of the lubricating oil supply hole on the valve arm upper surface can be prevented from flowing down from the oil groove formed on the valve arm upper surface. In addition, since lubricating oil can be efficiently supplied to the valve side and the push rod side, lubricity can be improved.
[0028]
4. A lubricating device for a valve operating mechanism for rotatably supporting a valve arm on a valve arm shaft transversely mounted on a cylinder head of an engine and supplying lubricating oil from the valve arm. A valve bridge is disposed at an end of the valve bridge, a lubricating oil reservoir is formed on the upper surface of the valve bridge, and the lubricating oil reservoir and a lubricating oil hole for supplying lubricating oil to a sliding portion between the valve bridge and the valve guide. , The lubrication of the sliding surface between the valve guide and the valve bridge can be improved, and wear and seizure of the sliding surfaces of the valve guide and the valve bridge can be prevented.
[Brief description of the drawings]
FIG. 1 is a partial sectional side view of an engine to which the present invention is applied.
FIG. 2 is a plan view showing a valve arm according to the present invention.
FIG. 3 is a side view of the same.
FIG. 4 is a sectional view taken along line AA of FIG.
FIG. 5 is a sectional view taken along line BB of FIG.
FIG. 6 is a partial cross-sectional side view showing an embodiment of the valve train to which the present invention is applied.
FIG. 7 is a partial side sectional view showing another embodiment of the valve train to which the present invention is applied.
FIG. 8 is a plan view of the same.
FIG. 9 is a plan view showing a lid.
FIG. 10 is a plan view showing a conventional valve arm.
FIG. 11 is a side view of the same.
FIG. 12 is a sectional view taken along the line A′-A ′ of FIG.
FIG. 13 is a sectional view taken along the line B′-B ′.
[Explanation of symbols]
Reference Signs List 1 engine 2 cylinder head 6 valve arm shaft 8 valve arm 10 valve bridge 13 valve guide 26 lubricating oil hole 35 oil groove 36 lubricating oil reservoir 37 lubricating oil reservoir 38 rib 46 lubricating oil supply hole 46a outlet

Claims (3)

In a lubricating device of a valve operating mechanism that rotatably supports a valve arm on a valve arm shaft that is transversely mounted on a cylinder head of an engine and supplies lubricating oil from the valve arm, a valve arm is provided on an upper part of the valve operating mechanism. A lubricating device for a valve mechanism, wherein a lubricating oil reservoir receiving a lubricating oil from the lubricating oil is formed, and lubricating oil is supplied from the lubricating oil reservoir to a valve or the like. In a lubricating device of a valve operating mechanism for rotatably supporting a valve arm on a valve arm shaft transversely mounted on a cylinder head of an engine and supplying lubricating oil from the valve arm, a lubricating oil supply hole is provided at an upper portion of the valve arm. A lubricating device for a valve train, wherein an outlet portion is provided, a lubricating oil reservoir is formed in the outlet portion, and the lubricating oil reservoir communicates with an oil groove formed in a valve arm. In a lubricating device of a valve operating mechanism for rotatably supporting a valve arm on a valve arm shaft transversely mounted on a cylinder head of an engine and supplying lubricating oil from the valve arm, a valve bridge is provided at an end of the valve arm. A lubricating oil reservoir is formed on the upper surface of the valve bridge, and the lubricating oil reservoir communicates with a lubricating oil hole for supplying lubricating oil to a sliding portion between the valve bridge and the valve guide. Lubrication device for the valve train.

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