JP2021116736A - Valve gear of internal combustion engine - Google Patents

Abstract

To provide a valve gear which enables a function of a lash adjuster to be achieved properly in a multivalve type internal combustion engine.SOLUTION: A valve gear 10 includes: valves 12 which open or close ports 91 of a combustion chamber; a bridge 13 which is disposed so as to lie between the respective valves 12; a rocker arm 11 which opens or closes the respective valves 12 through the bridge 13; and valve pressing parts which respectively transmit pressing forces of the rocker arm 11 to the respective valves 12. At least one of the valve pressing parts is formed by a lash adjuster 14.SELECTED DRAWING: Figure 2

Description

The present invention relates to a valve gear of an internal combustion engine.

The valve gear of an internal combustion engine disclosed in Patent Document 1 is arranged above a plurality of exhaust valves, a crosshead (hereinafter, referred to as a bridge) arranged so as to straddle the plurality of exhaust valves, and a bridge. It is equipped with a rocker arm. The plurality of exhaust valves are always urged by the valve spring and kept closed. On the other hand, when the rocker arm swings and the bridge descends against the urging force of the valve spring, a plurality of exhaust valves are opened at the same time. The end of the rocker arm opposite the side that abuts the bridge is supported by the top edge of the rod. The lower end of the rod is in contact with the cam.

Japanese Unexamined Patent Publication No. 7-2478112

In the above, for example, due to wear of the contact portion between the rocker arm and the bridge, a large gap may be formed between the contact portions. On the other hand, for example, if a structure incorporating a lash adjuster is provided between the rod and the cam or between the rocker arm and the rod, the clearance at the contact portion can be properly maintained and maintenance-free. It is also possible to realize the conversion. However, when this structure is applied to the above-mentioned two-valve type in which two exhaust valves are provided on one rocker arm, the load acting on the lash adjuster is doubled as compared with the case of a single valve, so that the durability of the lash adjuster is doubled. There is a concern that there will be a shortage.

The present invention has been completed based on the above circumstances, and an object of the present invention is to bring out the function of the lash adjuster even in a multi-valve internal combustion engine.

The valve gear of the internal combustion engine of the present invention opens and closes a plurality of valves for opening and closing a port of a combustion chamber, a bridge arranged so as to straddle the plurality of valves, and the plurality of valves via the bridge. A plurality of valve pressing portions located between the rocker arm, the plurality of valves and the rocker arm, and transmitting the pressing force of the rocker arm to the plurality of valves, respectively, are provided, and among the plurality of valve pressing portions. At least one valve pressing portion is composed of a rush adjuster.

Since at least one valve pressing portion of the plurality of valve pressing portions is composed of the lash adjuster, it is possible to prevent a large gap from being formed at the contact portion between the bridge and the rocker arm or the contact portion between the valve and the bridge. It is possible to suppress the wear of the contact portion. Here, since the load from each valve acts on the lash adjuster individually, it is sufficient that the lash adjuster has enough strength to withstand the load from one corresponding valve. Therefore, according to this configuration, the valve clearance adjusting function by the lash adjuster can be exhibited.

It is sectional drawing of the valve gear which concerns on Example 1. FIG. It is a partially enlarged sectional view of FIG. FIG. 2 is a view corresponding to FIG. 2 of the valve gear according to the second embodiment. FIG. 2 is a view corresponding to FIG. 2 of the valve gear according to the third embodiment. FIG. 4 is a partially enlarged cross-sectional view showing a state in which the bridge is tilted from FIG.

Preferred embodiments of the present invention are shown below.
(1) The bridge preferably has a recess into which the lash adjuster is fitted. According to this configuration, the lash adjuster can be stably arranged on the bridge.
(2) The bridge may have a cap that closes the opening of the recess. According to this configuration, it is possible to prevent the lash adjuster from coming out of the bridge.
(3) The cap may have a hole through which the stem end of the valve penetrates, and the stem end may face the inside of the recess through the hole. According to this configuration, the load from each valve does not act on the cap, and it becomes easy to secure the strength of the cap.
(4) The rocker arm has a rocker arm side oil passage communicating with an oil hole of the rocker shaft, and the bridge has a bridge side oil passage communicating with the rocker arm side oil passage, and the end of the bridge side oil passage. Is preferably opened on the inner surface of the recess. According to this configuration, the oil in the oil hole of the rocker shaft can reach the recess from the rocker arm side oil passage through the bridge side oil passage. In addition, oil can flow into the lash adjuster. As a result, oil can be stably supplied to the lash adjuster.
(5) The bridge is arranged so as to straddle the two valves, one of the two valve pressing portions is composed of the lash adjuster, and the other valve pressing portion is a bridge. It is preferable that the lash adjuster side is provided with a spherical contact surface that contacts the stem end of the valve. According to this configuration, the lash adjuster can be omitted from the other valve pressing portion, and the cost can be reduced accordingly. On the other hand, since the other valve pressing portion is composed of a part of the bridge, a height difference is formed between a part of the bridge and the lash adjuster side when the lash adjuster is operated, and there is a concern that the bridge may be tilted. be. However, according to the above configuration, since the contact portion on the lash adjuster side has a spherical shape, it is possible to prevent the portion on the lash adjuster side from hitting the stem end even if the bridge is tilted. ..

[Details of Embodiment]
Hereinafter, a specific example of the valve gear of the internal combustion engine will be described with reference to the drawings. It should be noted that the present invention is not limited to these examples, and is indicated by the scope of claims, and is intended to include all modifications within the meaning and scope equivalent to the scope of claims.

<Example 1>
As shown in FIG. 1, the valve operating device 10 according to the first embodiment is provided in a multi-valve OHV engine. The valve gear 10 includes a rocker arm 11 arranged above the cylinder head 90, a plurality of valves 12 (intake valve or exhaust valve) facing the ports 91 (intake port / exhaust port) of the combustion chamber, and each valve 12. It includes a bridge 13 displaceable up and down between the rocker arm 11 and a rush adjuster 14 incorporated in the bridge 13 and in contact with each valve 12.

The rocker arm 11 is swingably supported by the rocker shaft 92. The rocker arm 11 has a shape extending long from one end (left end in FIG. 1) to the other end (right end in FIG. 1). The rocker shaft 92 is inserted through the middle portion of the rocker arm 11 in the length direction. One end of the rocker arm 11 is configured by mounting a pivot 15. The lower end of the pivot 15 has a spherical shape and presses the upper surface of the bridge 13. As shown in FIG. 2, an intervening member 30 is provided between one end of the rocker arm 11 and the upper surface of the bridge 13. The upper surface of the intervening member 30 is formed in a concave spherical shape corresponding to the lower end of the pivot 15. The lower surface of the intervening member 30 is formed in a flat shape corresponding to the upper surface of the arm receiving portion 23 described later of the bridge 13.

As shown in FIG. 1, the other end of the rocker arm 11 abuts on the upper end of the push rod 93. The lower end of the push rod 93 is in contact with the tappet 96, and the lower surface of the tappet 96 is in contact with the cam 94.

The plurality of valves 12 are composed of two valves 12. Each valve 12 has the same shape as each other. The cylinder head 90 has a valve guide 95 through which each valve 12 is slidably inserted.

Each valve 12 has a disk-shaped valve body 16 and a rod-shaped valve stem 17 extending upward from the valve body 16. The valve body 16 faces the opening of the port 91 of the combustion chamber and has a shape that allows the port 91 to be opened and closed. Each valve stem 17 is guided by a valve guide 95. A spring receiving seat 18 is attached to the outer periphery of the upper portion of each valve stem 17. A valve spring 20 is provided between each spring receiving seat 18 and the cylinder head 90. Each valve spring 20 resists the pressing force of the rocker arm 11 and urges the valve 12 in the closing direction.

The bridge 13 has a form extending in the left-right direction of FIG. The valves 12 are arranged side by side in parallel below the left and right sides (both sides in the longitudinal direction) of the bridge 13. In other words, the bridge 13 is arranged so as to straddle each valve 12.

The bridge 13 has a pair of assembling portions 22 for assembling the lash adjusters 14 on both the left and right sides, and one end portion (pivot 15) of the rocker arm 11 is provided between the assembling portions 22 on the left and right center sides via an intervening member 30. It has an arm receiving portion 23 for receiving. The upper surface of the arm receiving portion 23 has a flat shape and is arranged in surface contact with the lower surface of the intervening member 30.

Each assembly portion 22 is formed in a cylindrical shape along the vertical direction. The left and right ends of the arm receiving portion 23 are integrally connected to the lower portion of each assembling portion 22, respectively. The longitudinal direction of the bridge 13 and the longitudinal direction of the rocker arm 11 intersect when viewed from above. Therefore, in FIG. 1, one assembly portion 22 (the assembly portion 22 on the left side of FIG. 1) is located on the back side of the paper surface, and the other assembly portion 22 (the assembly portion 22 on the right side of FIG. 1) is on the front side of the paper surface. Located on the side. As a result, the upper portion of each assembly portion 22 can avoid interference with the rocker arm 11.

As shown in FIG. 2, each assembly portion 22 has a recess 24 that opens to the lower surface. The recess 24 has a circular cross-sectional shape, and the lash adjuster 14 is inserted into the recess 24 in a fitted state. The upper wall of the assembling portion 22 is connected orthogonally to the peripheral wall and closes the upper surface of the recess 24. Each assembling portion 22 has an opening hole 25 penetrating vertically in the central portion of the upper wall.

A cap 19 for closing the lower surface opening of the recess 24 is attached to each assembly portion 22. The cap 19 is a circular plate material, and has holes 26 penetrating vertically in the central portion. The end portion (stem end portion 21) of the valve stem 17 is inserted into the hole 26 of the cap 19 so as to be relatively displaceable in the vertical direction.

The lash adjuster 14 is a known one and has a cylindrical body 27 and a plunger 28 to be inserted into the body 27. In FIG. 2, only one of the two lash adjusters 14 (the lash adjuster 14 on the left side of FIG. 2) is designated by a reference numeral.
The upper end portion of the plunger 28 is formed in a hemispherical shape, and has an oil passage hole 29 penetrating vertically in the central portion. The lower end portion of the plunger 28 is arranged parallel to the bottom wall of the body 27, and has a valve hole 31 penetrating vertically in the central portion.

A low pressure chamber 32 is provided inside the plunger 28. A high pressure chamber 33 is provided between the lower end of the plunger 28 and the bottom wall of the body 27 in the body 27. In the high pressure chamber 33, a spherical valve body 34, a retainer 35 accommodating the valve body 34, a first spring member 36 for urging the valve body 34 toward the lower end side of the plunger 28 in the retainer 35, and a plunger 28. A second spring member 37, which urges the body 27 to protrude from the body 27, is provided.

A plunger groove 38 recessed over the entire circumference is provided on the outer peripheral surface of the peripheral portion of the plunger 28, and a plunger oil hole 39 penetrating to the left and right in the drawing is provided on the inner surface of the plunger groove 38. A body groove 41 recessed over the entire circumference is provided on the outer peripheral surface of the peripheral wall of the body 27, and a body oil hole 42 penetrating to the left and right in the drawing is provided on the inner surface of the body groove 41.

The lash adjuster 14 is housed in the recess 24 of the assembly portion 22 with the bottom wall of the body 27 facing downward. By closing the lower surface opening of the recess 24 with the cap 19, the lash adjuster 14 is accommodated in the recess 24 in a state where it is restricted from coming off (falling off). The body groove 41 of the lash adjuster 14 is arranged so as to face the inner surface of the recess 24.

A receiving member 40 is provided between the upper wall of the assembly portion 22 and the lash adjuster 14. The lower surface of the receiving member 40 has a concave spherical shape and abuts on the spherical portion of the upper end portion of the plunger 28. The upper surface of the receiving member 40 has a flat surface shape and comes into contact with the flat lower surface of the upper wall of the assembly portion 22. The receiving member 40 has a through hole 44 penetrating vertically in the central portion.

Oil is supplied into the lash adjuster 14 through the rocker arm 11 and the bridge 13. The valve gear 10 is provided with a rocker arm side oil passage 45 and a bridge side oil passage 46 as oil supply passages. As shown in FIG. 1, the rocker arm side oil passage 45 extends from the entrance communicating with the oil hole 97 of the rocker shaft 92 toward one end in the rocker arm 11, and penetrates the inside of the pivot 15 vertically at one end. It has become. As shown in FIG. 2, the bridge-side oil passage 46 communicates with the outlet of the rocker arm-side oil passage 45 through a communication hole 47 that vertically penetrates the intervening member 30. The bridge-side oil passage 46 extends shortly up and down in the arm receiving portion 23 of the bridge 13, and extends from the lower end of the vertical oil passage 48 facing the communication hole 47 to the left and right sides of the vertical oil passage 48, and each assembly portion. It has a sideways oil passage 49 penetrating 22 and. The left and right ends of the lateral oil passage 49 are open to each recess 24.

The oil flowing through the oil hole 97 of the rocker shaft 92 enters the bridge side oil passage 46 from the rocker arm side oil passage 45 through the communication hole 47, and further flows through the bridge side oil passage 46 and is introduced into the recess 24. Then, the oil enters the body groove 41 in the recess 24, is introduced into the low pressure chamber 32 through the body oil hole 42, the plunger groove 38 and the plunger oil hole 39, and is further filled in the high pressure chamber 33 through the valve hole 31. The oil stored in the low pressure chamber 32 can be discharged to the outside of the bridge 13 through the oil passage hole 29, the through hole 44 and the opening hole 25. The inner diameter of the through hole 44 is smaller than the inner diameter of each of the oil through hole 29 and the opening hole 25 in order to prevent oil leakage.

Next, the assembly structure and operation of the valve gear 10 will be described.
The receiving member 40 is inserted into the recess 24 of each assembly portion 22, and then the lash adjuster 14 is inserted. After that, the cap 19 is fixed to the lower end of each assembly 22 by, for example, press-fitting, adhering, or screwing.

The arm receiving portion 23 of the bridge 13 abuts on the intervening member 30 on one end side of the rocker arm 11, the stem end portion 21 of each valve 12 faces each recess 24 through the hole 26 of each cap 19, and the stem end portion 21 The upper end abuts on the flat lower surface of the bottom wall of the body 27 of the lash adjuster 14 (see FIG. 2).

When the push rod 93 reciprocates up and down due to the rotation of the cam 94, the rocker arm 11 swings and displaces up and down about the rocker shaft 92. When one end of the rocker arm 11 is lowered, the arm receiving portion 23 is pressed downward, and the bridge 13 is lowered against the urging force of the valve spring 20. As a result, the valve body 16 of each valve 12 is lowered, and the port 91 is opened. As the bridge 13 rises under the urging force of the valve spring 20 due to the further rotation of the cam 94, the valve body 16 of each valve 12 and one end of the rocker arm 11 also rise, and the port 91 is closed.

In the process of the bridge 13 being displaced vertically, an upward pressing force is applied to the lash adjuster 14 from the valve spring 20 side, while a downward pressing force is applied from one end side of the rocker arm 11.

When one end of the rocker arm 11 rises, the plunger 28 is urged by the second spring member 37 and protrudes from the body 27. At this time, the lash adjuster 14 follows the ascending displacement of one end of the rocker arm 11. When the plunger 28 protrudes from the body 27, the volume of the high pressure chamber 33 expands, and the valve body 34 separates from the lower end portion of the plunger 28 against the urging force of the first spring member 36, and the valve hole from the low pressure chamber 32. Oil flows into the high pressure chamber 33 through 31. The pressure in the high pressure chamber 33 rises due to the inflow of oil.

On the other hand, when the bridge 13 is pressed against the rocker arm 11, the plunger 28 that comes into contact with the upper wall of each assembly portion 22 is also pressed via the bridge 13. The displacement of the plunger 28 pressed through the bridge 13 is limited by the oil filled in the high pressure chamber 33. When the oil pressure in the high pressure chamber 33 increases, the valve body 34 closes the valve hole 31, and the flow of oil from the low pressure chamber 32 to the high pressure chamber 33 is blocked. Then, the displacement of the plunger 28 is limited, and the lash adjuster 14 becomes rigid, so that the relative positions of the rocker arm 11, the bridge 13, and each valve 12 are kept constant.

As described above, each lash adjuster 14 follows the displacement of the rocker arm 11 via the bridge 13, so that the state in which the stem end 21 of each valve 12 abuts on the lower surface of the bottom wall of each lash adjuster 14 is maintained. .. That is, the valve clearance of each valve 12 is adjusted by each lash adjuster 14.

In the case of the first embodiment, the two lash adjusters 14 are configured as valve pressing portions that press the valve 12, respectively. Pushing pressure (load) acts on each of the two lash adjusters 14 individually from the valve 12. Therefore, it is easier to secure the durability of the lash adjuster 14 as compared with the case where the pressing force acts on one lash adjuster 14 from the two valves 12, and the valve clearance adjusting function of the lash adjuster 14 can be properly exerted. can.

Further, since each lash adjuster 14 is fitted into the recess 24 of each assembly portion 22, each lash adjuster 14 can be stably arranged with respect to the bridge 13.

In particular, the receiving member 40 is interposed between the upper end of the plunger 28 and the upper wall of the assembling portion 22, and the upper end of the lash adjuster 14 is supported by the receiving member 40 so that the shaft of the lash adjuster 14 in the recess 24 is supported. The deviation can be prevented. Further, the oil stored in the low pressure chamber 32 can be discharged from the opening hole 25 through the through hole 44 of the receiving member 40.

Further, since the lower surface opening of the recess 24 of each assembly portion 22 is closed by the cap 19, it is possible to prevent the lash adjuster 14 from coming out of the bridge 13.
Further, since the cap 19 has a hole 26 for penetrating the stem end portion 21 of the valve 12, the pressing force does not act on the cap 19 from the valve 12, and the concern that the cap 19 comes off from the bridge 13 is reduced. be able to.

Further, the rocker arm 11 has a rocker arm side oil passage 45 communicating with the oil hole 97 of the rocker shaft 92, and the bridge 13 has a bridge side oil passage 46 communicating with the rocker arm side oil passage 45. Since the end is open to the inner surface of the recess 24, oil can be stably supplied to the lash adjuster 14 housed in the recess 24.

<Example 2>
FIG. 3 shows Example 2. In the second embodiment, the form of the bridge 13A is different from that of the first embodiment. Other configurations are the same as those in the first embodiment, and the description overlapping with the first embodiment will be omitted.
Contrary to the first embodiment, each assembly portion 22A of the bridge 13A has a recess 24A that opens on the upper surface. The recess 24A has a circular cross-sectional shape, and the lash adjuster 14 is inserted into the recess 24A in a fitted state. The lower wall of the assembly portion 22A is connected orthogonally to the peripheral wall and closes the lower surface of the recess 24A. Each assembly portion 22A has a hole 26A penetrating vertically in the central portion of the lower wall. The end portion (stem end portion 21) of the valve stem 17 is inserted into the hole 26A in the lower wall so as to be relatively displaceable in the vertical direction.

The upper surface opening of the recess 24A is closed by the cap 19A. The cap 19A is a circular plate material, and has an opening hole 25A penetrating vertically in the central portion. The opening hole 25A of the cap 19A communicates with the through hole 44 of the receiving member 40 and the oil passing hole 29 of the plunger 28. The cap 19A is fixed to the upper end of each assembly 22A by, for example, press-fitting, adhering, or screwing.

Each lash adjuster 14 is inserted into the recess 24A of each assembly portion 22A from above. Subsequently, the receiving member 40 is inserted into the recess 24A of each assembly portion 22A. After that, the cap 19A is attached to the upper end of each assembly portion 22A. As a result, the lash adjuster 14 is accommodated in the recess 24A in a retaining state with the receiving member 40 interposed between the upper end of the plunger 28 and the cap 19A.

The mechanism of the valve gear 10 is the same as that of the first embodiment. Therefore, also in the second embodiment, the valve clearance of each valve 12 is appropriately adjusted by each lash adjuster 14. Further, the oil in the low pressure chamber 32 of the lash adjuster 14 can be discharged to the outside of the bridge 13A from the opening hole 25A of the cap 19A through the oil passage hole 29 and the through hole 44.

<Example 3>
4 and 5 show Example 3. The third embodiment is different from the first embodiment in that one of the two valve pressing portions is composed of the lash adjuster 14 and the other one is composed of the bridge side valve pressing portion 51. Other configurations are the same as those in the first embodiment, and the description overlapping with the first embodiment will be omitted. Since the detailed structure of the lash adjuster 14 is the same as that of the first embodiment, only the main structure of the lash adjuster 14 is designated in FIG.

The bridge 13B has an assembly portion 22B at one end of the left and right sides, and a bridge-side valve pressing portion 51 at the other end. The left and right center sides of the bridge 13B are arm receiving portions 23B that receive one end (pivot 15) of the rocker arm 11 via the intervening member 30.

The assembly portion 22B has a cylindrical shape along the vertical direction, and has a recess 24B that opens to the upper surface inside. The lash adjuster 14 is inserted into the recess 24B together with the receiving member 40. A cap 19B that closes the upper surface opening of the recess 24B is attached to the upper end of the assembly 22B. In the central portion of the cap 19B, an opening hole 25B communicating with the through hole 44 and the oil through hole 29 is provided so as to penetrate vertically. In the central portion of the lower wall of the assembly portion 22B, a hole 26B whose diameter is expanded in a downward taper shape is provided so as to penetrate vertically.

The bridge-side oil passage 46B has a vertical oil passage 48B whose upper end faces the communication hole 47 and a horizontal oil passage that extends from the lower end of the vertical oil passage 48B to one side (right side in FIG. 4) and penetrates each assembly portion 22B. It has 49B and. The end of the sideways oil passage 49B opens into the recess 24B. Unlike the first and second embodiments, the bridge-side oil passage 46B does not have a portion extending from the vertical oil passage 48B to the other side.

Below the lash adjuster 14, a continuous member 53 that contacts the lower surface of the bottom wall of the body 27 is arranged. The lower surface of the continuous member 53 is configured as a contact surface 54 that protrudes in a spherical shape.
The bridge-side valve pressing portion 51 has a shape continuous from the arm receiving portion 23B, has a pair of forks 55 protruding downward, and has a gently curved R surface 56 on the back surface between the forks 55. Have.

Of the two valves 12, the valve 12 on one side is pressed by the lash adjuster 14 with the upper end of the stem end 21 in contact with the contact surface 54 of the lash adjuster 14 inserted into the recess 24B of the assembly portion 22B. NS. The valve 12 on the other side abuts the upper end of the stem end 21 on the R surface 56 of the valve pressing portion 51 on the bridge side, and is pressed by a part of the bridge 13B.

In the case of the third embodiment, one of the two valve pressing portions is composed of the lash adjuster 14, and the other one is composed of the bridge side valve pressing portion 51. The point that the pressing force acts on the lash adjuster 14 from one valve 12 is the same as that of the first embodiment. Therefore, also in the third embodiment, it is easy to secure the durability of the lash adjuster 14, and the valve clearance adjusting function can be appropriately exhibited. In particular, since it is sufficient to provide one lash adjuster 14 for each of the two valves 12, the cost can be reduced and the work load of assembly can be reduced.

In the case of the third embodiment, when the lash adjuster 14 is operated, a height difference is formed between one end and the other end of the bridge 13B, so that there is a concern that the bridge 13B tilts to the left or right. However, as shown in FIG. 5, even if the bridge 13B is tilted to the left or right, the contact surface 54 on the lash adjuster 14 side has a spherical shape, so that the portion on the lash adjuster 14 side is cornered at the stem end 21. It is possible to prevent hitting. In particular, since the hole 26B of the assembly portion 22B expands in diameter downward, it is possible to avoid interference between the stem end portion 21 and the bridge 13B when the bridge 13B is tilted to the left or right.

<Other Examples>
Hereinafter, other embodiments will be briefly described.
(1) In Examples 1 to 3, a receiving member that abuts on the upper end of the plunger is provided in the recess of the assembling portion, but in another embodiment, the receiving member is omitted and the upper end of the plunger is assembled. It may be brought into contact with the upper wall or the cap of the portion.
(2) In Examples 1 to 3, the rocker arm is configured to follow the cam via the push rod, but in another embodiment, the rocker arm is configured to come into contact with the cam without passing through the push rod. You may.
(3) In Examples 1 and 2, the lash adjuster contacts the stem end of the valve and presses the stem end, but in another embodiment, the lash adjuster pads the stem end of the valve. It may be configured to press through.
(4) In the third embodiment, the contact surface is provided on the continuous member, but in another embodiment, even if the contact surface is integrally formed on the lower surface of the bottom wall of the body in the lash adjuster. good.
(5) Similar to the holes of the third embodiment, the holes of the first and second embodiments may be formed on the lower wall of the cap or the assembly portion by expanding the diameter downward in a tapered shape.
(6) In the embodiment of the third embodiment, as in the first embodiment, the recess is opened on the lower surface of the assembly portion, the cap is attached to the assembly portion so as to close the lower surface opening, and the stem end portion is inserted into the cap. A hole may be provided.
(7) The present invention can also be applied to a valve gear of an internal combustion engine in which one bridge is erected on three or more valves.
(8) The present invention can also be applied to a valve gear in which a guide shaft for guiding the vertical displacement of the bridge is erected on the cylinder head.

10 ... Valve gear 11 ... Rocker arm 12 ... Valve 13, 13A, 13B ... Bridge 14 ... Rush adjuster (valve pressing part)
19, 19A, 19B ... Cap 20 ... Valve spring 21 ... Stem end 24, 24A, 24B ... Recess 45 ... Rocker arm side oil passage 46 ... Bridge side oil passage 51 ... Bridge side valve pressing part (valve pressing part)
54 ... Contact surface 90 ... Cylinder head 91 ... Port 92 ... Rocker shaft 97 ... Oil hole

Claims (6)

Multiple valves that open and close the ports of the combustion chamber,
A bridge arranged so as to straddle the plurality of valves,
A rocker arm that opens and closes the plurality of valves via the bridge, and
A plurality of valve pressing portions located between the plurality of valves and the rocker arm and transmitting the pressing force of the rocker arm to the plurality of valves, respectively.
With
At least one of the plurality of valve pressing portions is a valve operating device for an internal combustion engine composed of a lash adjuster. The valve gear for an internal combustion engine according to claim 1, wherein the bridge has a recess for fitting the lash adjuster. The valve gear of an internal combustion engine according to claim 2, wherein the bridge has a cap for closing the opening of the recess. The valve gear for an internal combustion engine according to claim 3, wherein the cap has a hole through which the stem end of the valve is penetrated, and the stem end faces the inside of the recess through the hole. The rocker arm has a rocker arm side oil passage communicating with an oil hole of the rocker shaft, the bridge has a bridge side oil passage communicating with the rocker arm side oil passage, and the end of the bridge side oil passage is the above. The valve operating device for an internal combustion engine according to any one of claims 2 to 4, which is open on the inner surface of the recess. The bridge is arranged so as to straddle the two valves, one of the two valve pressing portions is composed of the lash adjuster, and the other valve pressing portion is a part of the bridge. The valve gear for an internal combustion engine according to any one of claims 1 to 5, wherein the lash adjuster has a spherical contact surface that contacts the stem end of the valve. ..

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