JPS6364602B2 - - Google Patents

Abstract

1. Valve control mechanism for inlet- or exhaust valves (1, 2) of internal combustion engines with at least one control lever (3, 4) which has a bearing bore (5) with a fixedly inserted bearing bushing (6) and is disposed pivotably over this on a bearing axis (7), which has an inlet bore (26) connected to a lubricating oil supply and at least one inlet duct (27) branching off from this, which duct is connected via throughflow apertures (34, 35) of the bearing bushing (6) and an annular oil distribution duct consisting of two separate chambers to several oil distribution bores (36) branching from this and leading to different lubricating positions and opening into the latter with outlet apertures, which lubricating positions are located on mutually co-operating surfaces (9, 10, 13, 18, 20, 22) of the bearing elements (8, 11, 12, 14, 17, 19, 21, 23) transmitting the force and the movement to and from the control lever (3, 4), characterised in that the annular oil distribution duct is divided into an upper oil distribution chamber (28), from which branch the oil distribution bores (36) leading to the lubricating positions, and a lower oil distribution chamber (29) spatially separated from this, from which at least one lubricating bore (32, 33), and a throughflow aperture (34, 35), passes respectively through the bearing bushing (6) to the bearing axis (7), in such a way that the upper oil distribution chamber (28) is connected to the lubricating oil supply only in the position of the control lever (3, 4) when the valves (1, 2) are open, and consequently with closed outlet apertures at the lubricating positions, and the lower oil distribution chamber (29) on the other hand is always connected via the supply duct (27) of the bearing axis (7) to the lubricating oil supply.

Description

DETAILED DESCRIPTION OF THE INVENTION The invention relates to a valve control mechanism for an intake or exhaust valve of an internal combustion engine, which comprises at least one control lever, the control lever being connected to a firmly seated bearing bush. and is arranged on a bearing shaft so as to be pivotable through the bearing bush, the bearing shaft being connected to a lubricating oil supply device, and an inflow hole branched from the inflow hole. at least one inlet passage, the inlet passage branching from the oil distribution passage through the passage hole of the bearing bushing and an annular oil distribution passage, leading to various oil filling points and having an outlet. mutual cooperation of bearing members connected to a plurality of oil distribution holes opening into said lubrication points, said lubrication points transmitting forces and movements from and to said control lever; Relates to a formation located on a surface.

This type of valve control mechanism is patented in the United States.
It is known from specification No. 3021826. Indeed, even with this known solution, the same lubricant is supplied to the bearing points of the control lever only at certain positions, but the supplied lubricating oil is more or less severely restricted to the bearing points during lubrication. The lubricant can overflow from the bearing gap, resulting in large oil losses at the lubrication points and, in addition, relatively large contamination on the cylinder head cover. Furthermore, due to the unchecked gushing of lubricating oil all over the place, maintenance and adjustment of the engine during operation is virtually impossible, or can only be done in anticipation of this situation. With this known solution, it is therefore not possible at all to satisfactorily lubricate the operating points of the valve tappet. This is because, for lubrication of this working surface, virtually only leakage oil is used which overflows at the bearing of the valve actuating element and flows out of the actuating element in an uncontrollable manner. It is questionable whether this incidental lubrication meets the requirements regarding the service life of this type of valve control mechanism.

In contrast, the object of the invention is to provide a lubrication point of the control lever which is located on the mutually cooperating surface of the bearing member which transmits the forces and movements from and to the control lever. It is an object of the present invention to provide a valve control mechanism capable of supplying a precisely metered amount of lubricating oil for each stroke related to movement. This problem is solved by a valve control mechanism having the features described in claim 1 of the invention.

In accordance with the invention, the annular oil distribution channel is divided into an upper oil distribution chamber and a lower oil distribution chamber, and the oil distribution holes leading to the individual lubrication points are connected to the upper oil distribution chamber. Only in the position of the control lever when the valve is open is it ensured that the upper oil distribution chamber is connected to a lubricating oil supply and can be filled with lubricating oil. However, in this position of the control lever, the lubricating oil supplied into the oil distribution hole does not overflow into the lubrication point. This is because the lubricating oil outlet is closed and pushed significantly higher than the lubricating oil pressure due to the open valve and the back pressure of the cam-actuated pushrod. This is because the cooperating surfaces of the bearing member which transmit the forces and movements to the control lever are in close contact with each other. The quantity of lubricating oil located in its oil distribution hole is reduced only in the position of the control lever, when the valve is closed and the push rod is not actuated, in the bearing member, which in this case is no longer under pressure. It can overflow from the open oil distribution holes into the bearing gap. This ensures that only a precisely metered amount of lubricant can be supplied to each lubrication point, and the lubricant consumption is therefore significantly reduced compared to known valve control mechanisms. What you get is what you get. Furthermore, the small, precisely metered quantity of lubricating oil ensures that no uncontrolled overflow of lubricating oil into the individual lubrication points is completely prevented, and therefore constant maintenance and adjustment even while the engine is running. can be done.

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

The valve control mechanism shown in the drawing serves for the actuation of two exhaust valves 1 and 2 of an internal combustion engine. Both intake valves (not shown) of this internal combustion engine can be actuated by a valve control mechanism which is structurally the same or similar in structure to this valve control mechanism. The illustrated valve control mechanism consists of two control levers 3 and 4, both of which have a bearing hole 5 with a firmly inserted bearing bushing 6 and which are provided with a bearing bushing 6. It is arranged on the support shaft 7 so as to be pivotable. The two bearing shafts 7 are each fixedly fixed in the cylinder head of the internal combustion engine and are fixed there to a bearing pedestal (not shown). first control lever 3
has a bearing pin 8 with a hemispherical bearing surface 9 spatially spaced from the bearing shaft 7 and tightly fitted in a bore, the outer shape of which bears a push rod. A bearing metal 10 disposed on the end face side of 11 is adapted. This push rod 11
cooperates with a camshaft (not shown) and is axially displaceable with respect to the pivoting of the control lever 3 by means of a cam of the camshaft. Moreover, a further bearing pin 12 is arranged on the first control lever 3;
This bearing pin 12 is likewise spaced apart from the bearing shaft 7, but is fixed in the receiving bore on the opposite side of the bearing pin 8. This bearing pin 12
has a spherical bearing surface 13, and this bearing surface 1
The outer shape of 3 includes the bearing surface 13 of the cup-shaped member 14.
A bearing metal is fitted which cooperates with the end face 15 of the valve tappet 16 of the exhaust valve 1 for actuation of the exhaust valve. do. Next to this second ball pin 12, from the bearing shaft 7 to the second ball pin 12,
A third bearing pin 17 is also firmly inserted into the bore of the control lever 3 at a greater distance. This third bearing pin 17 likewise has a spherical bearing surface 18 into which the bearing metal of the cup-shaped element 19 which cooperates is adapted. This cup-shaped member 19
is the second sliding surface 20 on the opposite side from the bearing metal.
The control lever 4 is mounted so as to be movable transversely with respect to the sliding surface associated with it. This bearing pin 17
and the cup-shaped member 19 is connected to the first control lever 3
serves to transmit the movement from the control lever 3 to the second control lever 4 when the control lever 3 is swiveled by the push rod 11, so that this second control lever 4 is synchronized about the bearing shaft 7. Useful for turning. A bearing pin 21 is fixed in the hole of this second control lever 4.
1 has substantially the same configuration as the second bearing pin 12 of the first control lever 3 and has a spherical bearing surface 22.
The bearing metal of the cup-shaped member 23 is adapted to the outer shape of the bearing surface 22.
This cup-shaped member 23 is rotatable around the ball pin, and has an end face 2 on the opposite side from the bearing metal.
4 acts on the end face of the valve tappet 25 of the second exhaust valve 2 for actuation of the exhaust valve.

The bearing member of the respective control lever 3 or 4 as well as the surfaces of the bearing member which transmit forces and movements from the respective control lever to the respective control lever can be lubricated by the lubrication device according to the invention as described below. be. Both of the above-mentioned bearing shafts have a central inlet hole 26 connected on the inlet side to a lubricating oil supply device (not shown) and a central inlet hole 26 that branches from this hole and extends in the radial direction to the outer peripheral surface of the bearing shaft. It has an inflow passage 27 communicating with. Furthermore, in each of the two control levers 3 and 4, the annular oil distribution channel is divided into an upper oil distribution chamber 28 and a lower oil distribution chamber 29 which is spatially isolated from the oil distribution chamber 28. has been done. In the exemplary embodiment shown, these two oil distribution chambers 28, 29 are formed by radial grooves in the bearing bush 6 which are interrupted at two circumferential locations by webs 30 and 31 and which are not visible to the outside. are delimited by the wall of the respective bearing bore 5 in the control lever 3 or 4. From each upper oil distribution chamber 28 , at least one lubrication hole 32 in each case leads through the bearing bush 6 to the respective bearing shaft 7 , and from each lower oil distribution chamber 29 , at least one lubrication hole 33 in each case leads to the bearing bush 6 . through which a passage hole 34 leads from the respective upper oil distribution chamber 28 to the respective bearing shaft 7 .
Through the bearing bush 6 a passage hole 35 opens into the respective bearing shaft 7 and from the respective lower oil distribution chamber 29 through the bearing bush 6 into the respective bearing shaft 7 . Moreover, an oil distribution hole 36 which branches off only from this upper oil distribution chamber 28 passes through the control lever and the bearing pin arranged on the control lever, and has an outlet for various oil distribution holes. It opens into different lubrication points, which lubrication points are located on mutually cooperating surfaces of the aforementioned bearing member for transmitting forces and movements from the control lever 1 or 2 to the control lever 1 or 2. . From the bearing metals of the three cup-like members 14, 19 and 23, the lubrication points on the opposite end faces 15, 20 and 24 of these cup-like members and the lubrication points on the end faces of the two valve tappets 16, 25 to be actuated. A passage hole 37 is provided in each cup-shaped member 14, 19 and 23 in order to allow the passage of lubricating oil to the lubrication points on the slide surfaces of the two control levers 4.

By the way, the two passage holes 34 and 35 to the upper oil distribution chamber 28 or the lower oil distribution chamber 29 are arranged in the following manner relative to the inflow channel 27 in the bearing shaft 7. That is, in any position of the control lever 3 or 4, the lower oil distribution chamber 29 and thus the oil supply hole 33 leading from this oil distribution chamber are connected via the passage hole 35 to the inflow channel 27 in the respective bearing shaft 7, and thus for the lubrication. Although connected to an oil supply system, the upper oil distribution chamber 28, together with the oil supply hole 32 and the oil distribution hole 36 leading from the oil distribution chamber, is connected when valves 1 and 2 according to FIG. 2 are opened. Only in the position of the adjusting lever 3 or 4 is the inflow channel 2 in the respective bearing shaft 7 via the passage hole 34
7 and, in turn, to a lubricating oil supply device. As can be seen in FIG. 2, when valves 1 and 2 are in the open position, the lubrication points are in contact with the push rod 12 and both valve tappets 16.
Due to the surface pressure generated on the mutually paired bearing surfaces due to the action of the forces 25 and 25, the drainage hole of the oil distribution hole 36 is closed, so that no lubricating oil floods the lubrication point in question. In this manner, the passage holes 37 and the oil distribution holes 36 in the three cup-like members 14, 19 and 23 are filled only with pressure oil.
Furthermore, in this embodiment, the paired bearing surfaces of the bearing bush 6 and the bearing shaft 7 associated therewith are supplied with pressure oil via the oiling hole 32 leading from the upper oil distribution chamber 28. Become.

After the valve has closed, and therefore after the parts of the valve control mechanism have moved from the position shown in FIG. 2 to the position shown in FIG. 1 is no longer present due to the valve clearance marked S in figure 1, and therefore the oil distribution hole 3
In this embodiment, the lubricating oil stored in the passage holes 37 of the cup-shaped members 14, 19, 23 and the passage holes 34 are again cut off from the lubricating oil supply device.
The pressure will be released based on the This pressure release is coupled to a small volumetric expansion of the stored lubricating oil, which is sufficient for lubrication on the one hand, but on the other hand causes a small amount of oil to flow into the lake. The lubricating points are allowed to overflow and are distributed in the play gap S between the faces of the paired bearing parts. In the position shown in FIG. 1 of the components of the valve control mechanism, only the lower oil distribution chamber 29 is connected to the oil supply device via the passage hole 35, so that in this embodiment the lubricating oil is branched off. The lubrication hole 33 reaches the paired surfaces of the bearing bush 6 and the bearing shaft 7. In this case, the displacing force generated by the invading lubricating oil is superimposed on the gravitational force of the respective control lever 3 or 4, and assuming that the displacing force of the incoming lubricating oil is approximately 10 times greater than the above-mentioned gravitational force as in this case. , these forces are adapted to cause a pumping movement of the control lever. Therefore, the lower oil distribution chamber 29
in this embodiment forms an oil source for supplying oil to the bearing section between the bearing shaft and the bearing bush. In this case, reversing the bearing load when opening valves 1 and 2 causes oil to drain from this oil source. This is because the oil located between the bearing shaft and the bearing bush can only enter the lower oil distribution chamber 2 through the oil filling hole 33.
This is because it cannot be pushed away into the 9. The pressure when forcing the lubricating oil back into this oil distribution chamber increases logarithmically and quickly reaches very high values, thereby providing a backflow prevention effect. This ensures a reliable supporting capacity of the bearing for the respective control lever.

The lubrication cycle described so far is repeated for each opening and closing of the valve.

[Brief explanation of drawings]

The drawings show an embodiment of the valve control mechanism according to the present invention, in which FIG. 1 is a partial sectional view of the valve control mechanism with the valve closed, and FIG. 2 is a partial sectional view of the valve control mechanism with the valve in the open position. 2 is a partial cross-sectional view of the valve control mechanism of FIG. 1; FIG. 1...first valve, 2...second valve, 3...first
control lever, 4... second control lever, 5...
Bearing hole, 6... Bearing bush, 7... Bearing shaft, 8
...Bearing pin, 9...Bearing surface, 10...Bearing metal, 11...Push rod, 12...Second support pin,
13... Spherical bearing surface, 14... Cup-shaped member,
15... End face, 16... Valve tappet, 17...
...Third bearing pin, 18...Spherical bearing surface, 19
...Cup-shaped member, 20...Sliding surface, 21...
Supporting pin, 22... Spherical bearing surface, 23... Cup-shaped member, 24... End face, 25... Valve tappet, 26... Inflow hole, 27... Inflow passage, 28...
...Upper oil distribution chamber, 29...Lower oil distribution chamber, 3
0, 31... Web, 32, 33... Lubricating hole, 3
4, 35...passing hole, 36...oil distribution hole, 37...
...Central passage hole.

Claims (1)

[Scope of Claims] 1. Valve control mechanism for an intake or exhaust valve of an internal combustion engine, comprising at least one control lever, the control lever having a bearing hole with a bearing bush in which it is firmly fitted. and is rotatably disposed on a bearing shaft through the bearing hole, and the bearing shaft connects an inflow hole connected to the lubricating oil supply device and at least one inflow passage branched from the inflow hole. a plurality of oil distribution points, the inlet passages opening into different lubrication points having outlets branching from the oil distribution passages via passage holes in the bearing bush and an annular oil distribution passage; a bearing member which is connected to the bore and whose lubrication point transmits forces and movements from the control lever to another member; and a mutually cooperating surface of the bearing member which transmits forces and movements from the other member to the control lever. In the case where the annular oil distribution passage is located in the upper oil distribution chamber 2,
8 and a lower oil distribution chamber 29 spatially separated from the oil distribution chamber 28, with an oil distribution hole 36 leading from the upper oil distribution chamber 28 through the bearing bush to the lubrication point. The oil distribution chambers 28 and 29 each have at least one branch.
Two lubrication holes 32, 33 and at least one passage hole 34, 35 communicate with the bearing shaft 7, and are arranged in a position in which the intake valve or exhaust valve 1, 2 is opened, and in turn, in a position in which the discharge port is closed. The upper oil distribution chamber 28 is connected to the lubrication point only when the control levers 3, 4 are present, whereas the lower oil distribution chamber 29 is constantly supplied with lubricating oil via the inflow channel 27 of the bearing shaft 7. A valve control mechanism for an intake valve or an exhaust valve of an internal combustion engine, characterized in that it is connected to a device. 2. Both of the oil distribution chambers 28 and 29 are connected to the web 3 at two locations in the circumferential direction provided in the bearing bush 6.
0,31 and is formed by a radial groove interrupted by a control lever 3,4 to the outside.
2. A valve control mechanism for an intake or exhaust valve of an internal combustion engine as claimed in claim 1, wherein the valve control mechanism is limited by a bore wall of a bearing bore in the internal combustion engine. 3. The surfaces 9, 13, 22 to be lubricated which transmit forces and movements from said control levers 3, 4 to other parts or which transmit forces and movements from said other parts to said control levers 3, 4 are at least one bearing pin 8, 12, 17, 21;
17, 21 for transmitting force and movement for actuating the intake or exhaust valve;
14, 16, 19, 23, 25. A valve control mechanism for intake or exhaust valves of an internal combustion engine according to claim 1, which is arranged at ports 14, 16, 19, 23, 25. 4 Two control levers 3, 4 are used which are each arranged on a bearing shaft 7 and are transmission connected to each other, the first control lever 3
A bearing pin 8 is paired on the bearing side with a bearing metal 10 of a push rod 11 actuated by a cam, and a second bearing pin 12 of the first control lever 3 and a second bearing pin 12 of the second control lever 4 are connected to each other. One bearing pin 21 is provided, and the bearing metal of the cup-shaped member 14, 23 acts on the bearing side with another end face 15, 24 to be lubricated on the valve tappet 16, 25 of the intake or exhaust valve. It is a contraposition,
A third bearing pin 17 provided on the first control lever 3 forms a pair on the bearing side with a bearing metal of a cup-shaped member 19 movably arranged on the second control lever 4. The sliding surfaces 9, 13, 18 of the three bearing pins 8, 12, 17 of the control lever 3 and the bearing metal cooperating therewith are filled with lubricating oil through the oil distribution hole 36 in the first control lever 3. possible, on the sliding surface 22 of the bearing pin 21 of the second control lever 4 and on the bearing metal cooperating therewith,
4. Valve control mechanism for an intake or exhaust valve of an internal combustion engine according to claim 3, wherein lubricating oil can be filled via an oil distribution hole 36 in the second control lever 4. 5 The bearing metal of each cup-shaped member 14, 19, 23 and the end surface 15, 20 on the opposite side of the bearing metal,
24 are connected to each other by oil passage holes 37, which are connected to the corresponding bearing only when the control levers 3, 4 are in the position in which the intake or exhaust valve is opened. Pins 12, 17, 21
The control levers 3, 4 can be filled with lubricating oil by being connected to an oil distribution hole 36 passing through them, and this spatially limited amount of lubricating oil is placed in the position where the intake or exhaust valve is closed. is discharged via the valve play clearance S between the end faces 15, 24 of each cup-shaped member 14, 19, 23 and the end face of the valve tappet 16, 25 or the sliding surface of the second control lever 4. A valve control mechanism for an intake valve or an exhaust valve of an internal combustion engine according to claim 4.