JP4239947B2 - Engine with variable valve mechanism - Google Patents

Description

  The present invention relates to an engine with a variable valve mechanism that can change the maximum valve lift amount of an engine valve (intake valve or exhaust valve).

A variable valve mechanism that can change the maximum valve lift of the engine valve has been proposed.
As a variable valve mechanism, for example, the one described in Patent Document 1 is known.

  The variable valve mechanism described in the same document includes a control shaft disposed in the cylinder head so as to be movable in the axial direction, and a plurality of valve lift mechanisms provided on the control shaft to lift engine valves. Configured.

  The valve lift mechanism includes a slider gear that is movable in conjunction with the control shaft, an input gear that is assembled to the slider gear and operated by the camshaft of the engine valve, and a roller rocker arm of the engine valve that is assembled to the slider gear. And an output gear to be operated.

In such a variable valve mechanism, the maximum valve lift of the engine valve can be changed by displacing the slider gear together with the control shaft in the axial direction to change the relative phase difference between the input gear and the output gear.
JP 2001-263015 A Japanese Patent No. 3508572

  By the way, in the conventional engine, the lubricating oil is applied to the portion where the cam of the camshaft and the roller rocker arm are moved relative to each other and the portion where the roller rocker arm and the engine valve are moved relative to each other as follows. Supply. That is, an oil supply pipe having an oil supply hole formed at a position corresponding to the cam of the camshaft is provided above the camshaft, and the lubricating oil is supplied to the above-mentioned location through the oil supply pipe (see Patent Document 2). ).

  On the other hand, in the engine with the variable valve mechanism, since the contact portion between the roller rocker arm and the engine valve is positioned below the valve lift mechanism, sufficient lubricating oil is supplied to the contact portion through the oil supply pipe. I can't.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a variable motion capable of supplying a sufficient amount of lubricating oil to a location where the engine valve and the roller rocker arm come into contact with each other and move relative to each other. The object is to provide an engine with a valve mechanism.

In the following, means for achieving the above object and its effects are described.
<Claim 1>
The invention according to claim 1 adjusts the valve clearance between the intake roller rocker arm for opening and closing the intake valve, the exhaust roller rocker arm for opening and closing the exhaust valve, and the exhaust valve and the exhaust roller rocker arm. In an engine with a variable valve mechanism that includes a lash adjuster and a variable valve mechanism that changes a maximum valve lift amount of the intake valve, lubricating oil in the lash adjuster is supplied to the intake valve, the intake roller rocker arm, The gist is that the exhaust roller rocker arm is provided with an oil passage to be discharged toward the contact portion.

<Claim 2>
The invention according to claim 2 adjusts the valve clearance between the intake roller rocker arm for opening and closing the intake valve, the exhaust roller rocker arm for opening and closing the exhaust valve, and the exhaust valve and the exhaust roller rocker arm. In the engine with a variable valve mechanism that includes a lash adjuster and a variable valve mechanism that changes the maximum valve lift amount of the intake valve, a side surface of the exhaust roller rocker arm that is located on the intake roller rocker arm side from provided an oil passage which communicates the up oil hole of the plunger of the lash adjuster Rutotomoni, and the opening of the oil passage toward the contact portion between the intake roller rocker arm and the intake valve is opened in the side surface This is the gist.

  According to the first and second aspects of the present invention, the lubricating oil in the lash adjuster of the exhaust roller rocker arm flows through the oil passage of the roller rocker arm, and reaches the contact portion between the intake valve and the intake roller rocker arm. It will be released towards. As a result, a sufficient amount of lubricating oil can be supplied to the contact portion.

<Claim 3>
According to a third aspect of the present invention, a plurality of intake valves are provided in each of the plurality of intake valves, and a plurality of intake roller rocker arms that open and close the intake valves are provided in one cylinder. In the engine with a variable valve mechanism, comprising: a lash adjuster for adjusting a valve clearance with the intake roller rocker arm; and a variable valve mechanism for changing a maximum valve lift amount of the intake valve, the plurality of intake rollers The gist is that each of the rocker arms is provided with an oil passage for releasing the lubricating oil in the lash adjuster toward the contact portion between the adjacent intake roller rocker arm and the intake valve.

<Claim 4>
The invention according to claim 4 has a plurality of intake valves in one cylinder, a plurality of intake roller rocker arms that are provided in each of the plurality of intake valves and open and close the intake valves, and the intake valves In the engine with a variable valve mechanism, comprising: a lash adjuster for adjusting a valve clearance with the intake roller rocker arm; and a variable valve mechanism for changing a maximum valve lift amount of the intake valve, the plurality of intake rollers For each of the rocker arms, an oil passage that communicates from a side surface facing the adjacent intake roller rocker arm to an oil hole of the plunger of the lash adjuster is provided, and an opening of the oil passage on the side surface is provided to the adjacent intake air. The opening of the roller rocker arm and the intake valve toward the contact area To have.

  According to the third and fourth aspects of the present invention, the lubricating oil in the lash adjuster of the intake roller rocker arm flows through the oil passage of the roller rocker arm, and the adjacent intake roller rocker arm and the intake valve contact with each other. It will be released towards the part. As a result, a sufficient amount of lubricating oil can be supplied to the contact portion.

<Claim 5>
According to a fifth aspect of the present invention, in the engine with a variable valve mechanism according to the third or fourth aspect, of each of the plurality of intake roller rocker arms, of the side surfaces facing the adjacent intake roller rocker arms The gist is that a part of the portion covering the end of the intake valve is removed.

  According to the fifth aspect of the present invention, since the lubricating oil discharged toward the contact portion between the intake roller rocker arm and the intake valve is not blocked by the side surface, more lubrication is applied to the contact portion. Oil can be supplied.

<Claim 6>
According to a sixth aspect of the present invention, in the engine with a variable valve mechanism according to any one of the first to fifth aspects, the variable valve mechanism includes a slider gear that is movable in an axial direction, and the slider gear. An input gear that is actuated by a cam of a camshaft of the intake valve, and an output gear that is assembled to the slider gear to operate the intake roller rocker arm, and is arranged in the axial direction of the slider gear. The gist is that the maximum valve lift of the intake valve is changed by changing the relative phase difference between the input gear and the output gear through movement.

<Claim 7>
The invention according to claim 7 adjusts the valve clearance between the exhaust roller rocker arm for opening and closing the exhaust valve, the intake roller rocker arm for opening and closing the intake valve, and the intake valve and the intake roller rocker arm. In an engine with a variable valve mechanism that includes a lash adjuster and a variable valve mechanism that changes a maximum valve lift amount of the exhaust valve, lubricating oil in the lash adjuster is supplied to the exhaust valve, the exhaust roller rocker arm, The gist of the present invention is that the intake roller rocker arm is provided with an oil passage to be discharged toward the contact portion.

<Claim 8>
The invention according to claim 8 adjusts the valve clearance between the exhaust roller rocker arm for opening and closing the exhaust valve, the intake roller rocker arm for opening and closing the intake valve, and the intake valve and the intake roller rocker arm. In the engine with a variable valve mechanism that includes a lash adjuster and a variable valve mechanism that changes the maximum valve lift amount of the exhaust valve, a side surface of the intake roller rocker arm that is located on the exhaust roller rocker arm side the lash adjuster of the plunger up to the oil hole is formed an oil passage communicating Rutotomoni from and an opening of the oil passage toward the contact portion of the exhaust roller rocker arm and the exhaust valve is opened in the side surface This is the gist.

  According to the seventh and eighth aspects of the present invention, the lubricating oil in the lash adjuster of the intake roller rocker arm circulates through the oil passage of the roller rocker arm, to the contact portion between the exhaust valve and the exhaust roller rocker arm. It will be released towards. As a result, a sufficient amount of lubricating oil can be supplied to the contact portion.

<Claim 9>
The invention according to claim 9 has a plurality of exhaust valves in one cylinder, a plurality of exhaust roller rocker arms provided on each of the plurality of exhaust valves for opening and closing the exhaust valves, and the exhaust valves. In the engine with a variable valve mechanism, comprising: a lash adjuster that adjusts a valve clearance with the exhaust roller rocker arm; and a variable valve mechanism that changes a maximum valve lift amount of the exhaust valve, the plurality of exhaust rollers The gist of the invention is that each of the rocker arms is provided with an oil passage for releasing the lubricating oil in the lash adjuster toward the contact portion between the adjacent exhaust roller rocker arm and the exhaust valve.

<Claim 10>
The invention according to claim 10 has a plurality of exhaust valves on one cylinder, a plurality of exhaust roller rocker arms provided on each of the plurality of exhaust valves to open and close the exhaust valves, and the exhaust valves. In the engine with a variable valve mechanism, comprising: a lash adjuster that adjusts a valve clearance with the exhaust roller rocker arm; and a variable valve mechanism that changes a maximum valve lift amount of the exhaust valve, the plurality of exhaust rollers For each of the rocker arms, an oil passage that communicates from a side surface facing the adjacent exhaust roller rocker arm to an oil hole of the plunger of the lash adjuster is provided, and an opening of the oil passage on the side surface is provided in the adjacent exhaust. It must be opened toward the contact part between the roller rocker arm and the exhaust valve It is set to.

  According to the ninth and tenth aspects of the present invention, the lubricating oil in the lash adjuster of the exhaust roller rocker arm flows through the oil passage of the roller rocker arm, and the exhaust roller rocker arm adjacent to the exhaust valve contacts the exhaust valve. It will be released towards the part. As a result, a sufficient amount of lubricating oil can be supplied to the contact portion.

<Claim 11>
The invention according to an eleventh aspect is the engine with a variable valve mechanism according to the ninth or tenth aspect, wherein each of the plurality of exhaust roller rocker arms is a side surface facing an adjacent exhaust roller rocker arm. The gist is that a part of the portion covering the end of the exhaust valve is removed.

  According to the eleventh aspect of the present invention, since the lubricating oil discharged toward the contact portion between the exhaust roller rocker arm and the exhaust valve is not blocked by the side surface, more lubrication is applied to the contact portion. Oil can be supplied.

<Claim 12>
A twelfth aspect of the present invention is the engine with a variable valve mechanism according to any one of the seventh to eleventh aspects, wherein the variable valve mechanism is a slider gear that is movable in the axial direction, and the slider gear. An input gear that is actuated by a cam of a camshaft of the exhaust valve, and an output gear that is assembled to the slider gear to operate the exhaust roller rocker arm, and is arranged in the axial direction of the slider gear. The gist is that the maximum valve lift of the exhaust valve is changed by changing the relative phase difference between the input gear and the output gear through movement.

(First embodiment)
A first embodiment of the present invention will be described with reference to FIGS.
In the present embodiment, the present invention is applied to an engine provided with a variable valve mechanism that changes the maximum valve lift amount of the intake valve.

<Engine structure>
FIG. 1 shows a planar structure of the engine.
The engine 1 includes a cylinder block 11 and a cylinder head 12.

A plurality of cylinders 13 are provided in the cylinder block 11.
The cylinder head 12 is provided with an intake valve 21 that opens and closes an intake port of each cylinder 13. A pair of intake valves 21 is provided for each cylinder 13.

The cylinder head 12 is provided with an exhaust valve 22 that opens and closes the exhaust port of each cylinder 13. A pair of exhaust valves 22 is provided for each cylinder 13.
An intake camshaft 23 is provided on the intake valve 21 side of the cylinder head 12. The intake cam shaft 23 is provided with intake cams 25 at positions corresponding to the cylinders 13.

  An exhaust camshaft 24 is provided on the cylinder valve 12 on the exhaust valve 22 side. The exhaust cam shaft 24 is provided with exhaust cams 26 at positions corresponding to the cylinders 13.

The intake camshaft 23 and the exhaust camshaft 24 are drivingly connected to the crankshaft via the timing chain 14.
The intake camshaft 23 is supported in a rotatable state through a plurality of intake camshaft support walls 15.

The exhaust camshaft 24 is supported in a rotatable state through a plurality of exhaust camshaft support walls 16.
In the engine 1, a variable valve mechanism 5 that continuously changes the maximum valve lift amount and valve operating angle (valve opening period) of each intake valve 21 is provided in the vicinity of the intake camshaft 23.

  The variable valve mechanism 5 is provided with a plurality of valve lift mechanisms 5 </ b> A that lift the intake valve 21 through the torque of the intake camshaft 23. The valve lift mechanism 5 </ b> A is disposed between the adjacent rocker shaft support walls 17.

<Overall structure of variable valve mechanism>
FIG. 2 shows a perspective structure of the variable valve mechanism 5.
The variable valve mechanism 5 includes a valve mechanism main body 51 and an actuator 52. The valve mechanism main body 51 includes a rocker shaft 53, a control shaft 54, and a valve lift mechanism 5A.

  The rocker shaft 53 is arranged in the cylinder head 12 so as to extend in the cylinder arrangement direction (arrow FR direction). That is, it is arranged in parallel with the intake camshaft 23. Further, it is fixed through the rocker shaft support wall 17 so that it cannot rotate and move in the axial direction. An arrow F indicates a direction away from the actuator 52, and an arrow R indicates a direction approaching the actuator 52.

  A control shaft 54 is disposed in the rocker shaft 53 so as to be movable in the axial direction. On the rocker shaft 53, a valve lift mechanism 5A is provided at a position corresponding to each cylinder 13. That is, all the valve lift mechanisms 5A are supported by one common rocker shaft 53.

The control shaft 54 is drivingly connected to the actuator 52.
The actuator 52 is driven through an electronic control device that comprehensively controls the engine 1.

  The electronic control device changes the maximum valve lift amount and the operating angle of the intake valve 21 by displacing the control shaft 54 in the axial direction through the control of the actuator 52. When the control shaft 54 is displaced in the direction of the arrow F, the maximum valve lift amount of the intake valve 21 is changed to a direction in which it increases. On the contrary, when the control shaft 54 is displaced in the direction of the arrow R of the engine 1, the maximum valve lift amount of the intake valve 21 is changed to be smaller. The relationship between the moving direction of the control shaft 54 and the changing direction of the maximum valve lift amount can be set opposite to the above relationship.

<Structure of valve mechanism body>
FIG. 3 shows an exploded perspective structure of the valve mechanism main body 51.
FIG. 4 shows a perspective structure of the slider gear 6.

FIG. 5 shows a cross-sectional structure of the slider gear 6 along the axial direction.
The valve lift mechanism 5 </ b> A includes a slider gear 6, an input gear 7, a first output gear 8, and a second output gear 9.

  The slider gear 6 is provided on the rocker shaft 53. Further, it is provided on the rocker shaft 53 so as to move in the axial direction in conjunction with the control shaft 54.

  The slider gear 6, the input gear 7, and the output gears 8 and 9 are meshed with each other through a helical spline. Further, the input gear 7 and the output gears 8 and 9 are respectively assembled to the slider gear 6 in a state where the side surfaces located between the gears 7, 8 and 9 are in contact with each other on the same axis.

[1] “Slider gear structure”
The slider gear 6 is provided with a slider gear input spline 61, a slider gear first output spline 62, and a slider gear second output spline 63.

  The slider gear input spline 61 is provided at the center of the slider gear 6 in the axial direction. Further, it is formed so as to mesh with a helical spline (input gear spline 71) of the input gear 7.

  The slider gear first output spline 62 is provided at the end on the actuator 52 side among the ends of the slider gear input spline 61. Further, the first output gear 8 is formed so as to mesh with the helical spline (first output gear spline 81). The slider gear input spline 61 and the slider gear first output spline 62 are formed so that the inclination directions of the tooth traces are opposite.

  The slider gear second output spline 63 is provided at the end of the slider gear input spline 61 opposite to the actuator 52. Further, the second output gear 9 is formed so as to mesh with a helical spline (second output gear spline 91). The slider gear input spline 61 and the slider gear second output spline 63 are formed so that the inclination directions of the tooth traces are opposite to each other.

  The slider gear first output spline 62 and the slider gear second output spline 63 are set to have the same outer diameter. Further, the outer diameter is set smaller than the groove portion of the slider gear input spline 61.

  A through hole 64 extending in the axial direction is formed inside the slider gear 6. A circumferential groove 65 extending in the circumferential direction is formed at a position on the central axis side of the slider gear input spline 61. The through hole 64 and the circumferential groove 65 are formed continuously.

  The slider gear input spline 61 is formed with a pin insertion hole 66 penetrating from the outside of the spline 61 to the circumferential groove 65. A control pin 67 for moving the slider gear 6 in the axial direction in conjunction with the control shaft 54 is inserted into the pin insertion hole 66.

[2] “Structure of input gear”
The input gear 7 includes an input gear housing 72 that is a main body thereof.
A space extending in the axial direction of the rocker shaft 53 is formed in the input gear housing 72. A helical spline (input gear spline 71) that meshes with the slider gear input spline 61 of the slider gear 6 is formed on the inner peripheral side of the input gear housing 72.

  An input arm 73 that contacts the intake camshaft 23 is provided on the outer peripheral side of the input gear housing 72. The input arm 73 includes a pair of support arms 73L and 73R, a shaft 73A, and a roller 73B.

Each of the above elements constituting the input arm 73 is configured as follows.
The support arms 73L and 73R are formed to protrude in the radial direction from the outer peripheral side of the input gear housing 72. Moreover, it forms so that it may mutually become parallel.
The shaft 73A is provided between the support arm 73L and the support arm 73R so as to be parallel to the axial direction of the rocker shaft 53.
The roller 73B is attached to the shaft 73A in a rotatable state.

[3] “Structure of the first output gear”
The first output gear 8 includes a first output gear housing 82 as a main body.

  A space extending in the axial direction of the rocker shaft 53 is formed in the first output gear housing 82. A helical spline (first output gear spline 81) that meshes with the slider gear first output spline 62 of the slider gear 6 is formed on the inner peripheral side of the first output gear housing 82. In addition, the inclination direction of the tooth line of the first output gear spline 81 is formed opposite to the inclination direction of the tooth line of the input gear spline 71.

  A first output arm 83 protruding in the radial direction is formed on the outer peripheral side of the base circular portion (base portion 82A) of the first output gear housing 82. On one side of the first output arm 83, a cam surface 83A curved in a concave shape is provided.

[4] “Structure of second output gear”
The 2nd output gear 9 is provided with the 2nd output gear housing 92 used as the main part.

  A space extending in the axial direction of the rocker shaft 53 is formed in the second output gear housing 92. A helical spline (second output gear spline 91) that meshes with the slider gear second output spline 63 of the slider gear 6 is formed on the inner peripheral side of the second output gear housing 92. The inclination direction of the tooth trace of the second output gear spline 91 is formed opposite to the inclination direction of the tooth trace of the input gear spline 71.

  A second output arm 93 protruding in the radial direction is formed on the outer peripheral side of the base circular portion (base portion 92A) of the second output gear housing 92. On one side of the second output arm 93, a cam surface 93A curved in a concave shape is provided.

<Structure of rocker shaft and control shaft>
FIG. 6 shows a perspective structure of the rocker shaft 53 and the control shaft 54.
In the rocker shaft 53, elongated holes 53A extending in the axial direction are formed at positions corresponding to the valve lift mechanisms 5A. The long hole 53A communicates from the outer peripheral surface of the rocker shaft 53 (the rocker shaft outer peripheral surface 53B) to the internal space.

In the control shaft 54, an insertion hole 54A extending in a direction substantially perpendicular to the central axis is formed at a position corresponding to the long hole 53A of the rocker shaft 53.
The rocker shaft 53 and the control shaft 54 are assembled as follows.

  The control shaft 54 is disposed in the internal space of the rocker shaft 53 in a state in which it can slide in the axial direction. Further, a bush 68 is disposed at a position corresponding to the circumferential groove 65 of the slider gear 6 on the outer peripheral side of the rocker shaft 53. The bush 68 is formed with a through hole 68 </ b> A extending in a direction substantially perpendicular to the central axis of the control shaft 54.

  Then, one end of the control pin 67 passes through the through hole 68 </ b> A of the bush 68 and the long hole 53 </ b> A of the rocker shaft 53 and is fitted into the insertion hole 54 </ b> A of the control shaft 54.

  The axial length of the control pin 67 is set as follows. That is, when the slider gear 6 is assembled on the rocker shaft 53 and the control pin 67 is fixed to the control shaft 54, the tip of the control pin 67 (the end opposite to the end fixed to the control shaft 54). Is set to a size arranged in the circumferential groove 65.

  The length corresponding to the axial direction of the control shaft 54 in the bush 68 is set as follows. That is, the width is set to be approximately the same as the width of the circumferential groove 65 of the slider gear 6. Thereby, the relative position in the axial direction between the control shaft 54 and the slider gear 6 is fixed.

<Assembly mode of variable valve mechanism>
With reference to FIG. 7, the assembly | attachment aspect of each member which comprises the variable valve mechanism 5 is demonstrated.
[1] “Assembly mode of each shaft and slider gear”
The control shaft 54 is disposed in the interior space of the rocker shaft 53 in a state where the control shaft 54 can slide in the axial direction.
A bush 68 is disposed in the circumferential groove 65 of the slider gear 6.
The control shaft 54 and the rocker shaft 53 are disposed in the through hole 64 of the slider gear 6.
One end of the control pin 67 is fixed to the insertion hole 54A of the control shaft 54 via the pin insertion hole 66 of the slider gear 6, the through hole 68A of the bush 68, and the long hole 53A of the rocker shaft 53.

[2] “Assembly mode of slider gear and each gear”
The input gear 7, the first output gear 8, and the second output gear 9 are assembled to the slider gear 6 as follows. That is, the input gear 7, the first output gear 8, and the second output gear 9 are arranged such that the arms (input arm 73, first output arm 83, second output arm 93) provided in the respective gears are in the circumferential position. The slider gear 6 is assembled so as to coincide with a predetermined position. Note that the predetermined position indicates the circumferential position of each arm at which the maximum valve lift amount can be changed as required.

<Operation mode of slider gear>
The operation mode of the slider gear 6 will be described with reference to FIG. The figure shows a partially broken perspective structure of the valve lift mechanism 5A.

  (A) In the variable valve mechanism 5, one end of the control pin 67 is fixed to the control shaft 54, and the other end is disposed in the circumferential groove 65 of the slider gear 6. Further, the relative position in the axial direction between the control shaft 54 and the slider gear 6 is fixed through the bush 68. As a result, the slider gear 6 moves in the axial direction in conjunction with the control shaft 54. That is, when the control shaft 54 moves in the axial direction, the slider gear 6 moves in the axial direction by the same amount.

  (B) In the variable valve mechanism 5, since the control pin 67 is disposed in the circumferential groove 65 of the slider gear 6, when the torque of the intake camshaft 23 is transmitted to the input gear 7, the slider gear 6 It swings around the rocker shaft 53 as an axis.

<Change mode of maximum valve lift>
In the variable valve mechanism 5, the slider gear 6 is moved in the axial direction together with the control shaft 54, and the relative position in the axial direction between the slider gear 6, the input gear 7, and the output gears 8 and 9 is changed. Twisting forces in opposite directions are applied to the input gear 7 and the output gears 8 and 9.

  As a result, the input gear 7 and the output gears 8 and 9 rotate relative to each other, and the relative phase difference between the input gear 7 (input arm 73) and the output gears 8 and 9 (output arms 83 and 93) is changed. The In the variable valve mechanism 5, since all the slider gears 6 are fixed to a common control shaft 54, the maximum valve lifts of all the intake valves 21 are simultaneously generated as the control shaft 54 moves. Be changed.

In the engine 1, the maximum valve lift amount of the intake valve 21 can be changed by changing the relative phase difference between the input arm 73 and the output arms 83 and 93.
The maximum valve lift varies through the movement of the control shaft 54 as follows.
(A) When the relative phase difference is the smallest, that is, when the input arm 73 and the output arms 83 and 93 are closest to each other in the circumferential direction, the maximum valve lift amount of the intake valve 21 is the smallest.
(B) When the relative phase difference is the largest, that is, when the input arm 73 and each output arm 83, 93 are in the most separated state in the circumferential direction, the maximum valve lift amount of the intake valve 21 is the largest.

<Valve lift structure of engine>
FIG. 9 shows a cross-sectional structure of the engine 1 along the line D1-D1 in FIG.
[1] “Valve lift structure on the intake side”
In the cylinder head 12, an intake roller rocker arm 31 is disposed above the intake valve 21. A valve lift mechanism 5 </ b> A of the variable valve mechanism 5 is disposed between the intake camshaft 23 and the intake roller rocker arm 31.

The intake roller rocker arm 31 includes an arm main body 31A and a roller 31B.
One end (adjuster side end 31C) of the arm main body 31A is supported by a lash adjuster 32. The lash adjuster 32 is fixed to the cylinder head 12. The other end (cap side end 31D) of the arm main body 31A is in contact with the stem cap 21A at the upper end of the intake valve 21.

  The cap side end portion 31D of the arm main body 31A is urged toward the variable valve mechanism 5 by the valve spring 33 of the intake valve 21. Thereby, the roller 31B of the intake roller rocker arm 31 is always maintained in contact with the output gears 8 and 9 of the valve lift mechanism 5A.

  The roller 73B of the input gear 7 is urged toward the intake camshaft 23 by a spring arranged in a compressed state on the cylinder head 12. Thus, the roller 73B is always maintained in contact with the intake cam 25 of the intake camshaft 23.

  Each of the output gears 8 and 9 is configured such that one of the base circular portions (base portions 82A and 92A) of the housings 82 and 92 and the cam surfaces 83A and 93A of the output arms 83 and 93 is always in contact with the roller 31B of the intake roller rocker arm 31. It is in a contact state.

  In the engine 1, the input gear 7 is pushed as the intake camshaft 23 rotates. At this time, the torque of the intake camshaft 23 is transmitted to the output gears 8 and 9 via the input gear 7 and the slider gear 6 so that the output gears 8 and 9 swing. Then, since the corresponding intake roller rocker arm 31 is pushed through the swinging of the output gears 8, 9, the intake valve 21 is lifted in the valve opening direction.

[2] “Valve lift structure on the exhaust side”
In the cylinder head 12, an exhaust roller rocker arm 41 is disposed above the exhaust valve 22.

The exhaust roller rocker arm 41 includes an arm main body 41A and a roller 41B.
One end (adjuster side end 41C) of the arm main body 41A is supported by a lash adjuster 42. The lash adjuster 42 is fixed to the cylinder head 12. The other end (cap side end 41D) of the arm body 41A is in contact with the stem cap 22A at the upper end of the exhaust valve 22.

  The cap side end 41D of the arm body 41A is urged toward the exhaust camshaft 24 by the valve spring 43 of the exhaust valve 22. Thus, the roller 41B of the exhaust roller rocker arm 41 is always maintained in contact with the exhaust cam 26 of the exhaust camshaft 24.

  In the engine 1, the exhaust roller rocker arm 41 is pushed as the exhaust camshaft 24 rotates. As the exhaust roller rocker arm 41 swings, the exhaust valve 22 is lifted in the valve opening direction.

<Lubrication oil supply structure>
In the engine 1, lubricating oil is supplied to the intake cam 25 of the intake camshaft 23 and the exhaust cam 26 of the exhaust camshaft 24 through an oil supply pipe provided on the cover of the cylinder head 12. The supply pipe is provided above the camshafts 23 and 24, and oil supply holes are formed at positions corresponding to the cams 25 and 26.

  On the other hand, the variable valve mechanism 5 is arranged on the intake valve 21 side, so that the contact portion between the intake roller rocker arm 31 and the stem cap 21A of the intake valve 21 is variable valve mechanism 5 (valve lift mechanism 5A). It is difficult to supply a sufficient amount of lubricating oil to the contact portion through the oil supply pipe.

  Therefore, in this embodiment, by releasing the lubricating oil in the lash adjuster 42 of the exhaust roller rocker arm 41 to the contact portion, a sufficient amount of lubricating oil is supplied to the contact portion. I have to. Hereinafter, a structure for realizing such supply of lubricating oil will be described.

<Exhaust roller rocker arm structure>
FIG. 10 shows a perspective structure of the exhaust roller rocker arm 41 and the lash adjuster 42.

  The lash adjuster 42 includes an adjuster main body 42A and a plunger 42B disposed on the main body 42A so as to be capable of reciprocating. At the tip of the plunger 42B, an oil hole 42C for allowing the internal lubricating oil to flow out is formed.

  In the arm main body 41A of the exhaust roller rocker arm 41, an adjuster mounting portion 41E is formed at the adjuster side end portion 41C. The adjuster mounting portion 41E is formed corresponding to the shape of the lash adjuster 42 on the tip end side of the plunger 42B. The plunger 42B is fitted into the adjuster mounting portion 41E.

  A cap attachment portion 41F is formed at the cap side end portion 41D of the arm main body 41A. A stem cap 22A of the exhaust valve 22 is fitted into the cap mounting portion 41F. The stem cap 22A moves relative to the exhaust side rocker arm 41 at the cap side end 41D.

FIG. 11 shows a front structure of the exhaust roller rocker arm 41 as viewed from the direction V1 in FIG.
FIG. 12 shows a planar structure of the exhaust roller rocker arm 41 as seen from the direction V2 in FIG.

FIG. 13 shows a side structure of the exhaust roller rocker arm 41 as viewed from the direction V3 in FIG.
FIG. 14 shows a planar structure of the exhaust roller rocker arm 41 as seen from the direction V4 in FIG.

  The exhaust roller rocker arm 41 is formed with an oil passage 41H that communicates from the side surface (intake side surface 41G) located on the intake roller rocker arm 31 side to the adjuster mounting portion 41E.

  In the oil passage 41H, an opening (adjuster opening 41HA) located in the adjuster mounting portion 41E is formed at a position corresponding to the oil hole 42C of the plunger 42B. Further, the opening (side opening 41HB) located on the intake side surface 41G is opened toward the contact portion (or the vicinity thereof) between the intake roller rocker arm 31 and the stem cap 21A of the intake valve 21. The intake roller rocker arm 31 referred to here is an intake roller rocker arm 31 that faces the exhaust roller rocker arm 41 in a direction orthogonal to the arrangement direction of the cylinders 13.

FIG. 15 shows a state where the plunger 42B of the lash adjuster 42 is fitted into the adjuster mounting portion 41E of the exhaust roller rocker arm 41.
FIG. 16 shows a cross-sectional structure of the exhaust roller rocker arm 41 and the lash adjuster 42 along the line D15-D15 in FIG.

Lubricating oil of the engine 1 is supplied into the plunger 42B of the lash adjuster 42 through the main body oil supply hole 42D and the plunger oil supply hole 42E.
In a state where the plunger 42B of the lash adjuster 42 is fitted into the exhaust roller rocker arm 41, the oil passage 41H of the exhaust roller rocker arm 41 and the oil hole 42C of the plunger 42B communicate with each other. Thereby, the lubricating oil in the plunger 42B is discharged to the outside of the rocker arm 41 through the oil hole 42C of the plunger 42B and the oil passage 41H of the exhaust roller rocker arm 41.

<Supply mode of lubricating oil>
With reference to FIG. 17 and FIG. 18, a description will be given of how the lubricant is supplied to the contact portion between the intake roller rocker arm 31 and the stem cap 21 </ b> A of the intake valve 21.

  In the engine 1, the side opening 41 </ b> HB of the oil passage 41 </ b> H of the exhaust roller rocker arm 41 is opened toward the contact portion between the intake roller rocker arm 31 and the stem cap 21 </ b> A of the intake valve 21. The lubricating oil of the lash adjuster 42 discharged to the outside through 41H is supplied to the contact portion. In the engine 1 of the present embodiment, the amount of lubricating oil supplied to the lash adjuster 42 (plunger 42B) is set so that the valve clearance adjustment function by the lash adjuster 42 is properly maintained.

<Effect of embodiment>
As described above in detail, according to the engine with a variable valve mechanism according to the first embodiment, the effects listed below can be obtained.

  (1) According to the engine 1 of the present embodiment, a sufficient amount of lubricating oil can be supplied to the contact portion between the intake roller rocker arm 31 and the stem cap 21A of the intake valve 21.

  (2) In the engine 1 of the present embodiment, the lubricating oil supply structure for the contact portion is realized by using the exhaust roller rocker arm 41 and the lash adjuster 42. The engine 1 can be configured without providing an oil supply device.

<Example of change>
In addition, the said 1st Embodiment can also be implemented as the following forms which changed this suitably, for example.

  In the first embodiment, the oil passage 41H is formed so as to communicate from the intake side surface 41G to the oil hole 42C. However, the oil passage 41H can be modified as follows, for example. In other words, the oil passage 41H can be formed in such a manner that an oil hole different from the oil hole 42C is formed in the plunger 42B of the lash adjuster 42 and the intake side surface 41G communicates with the oil hole.

(Second Embodiment)
A second embodiment of the present invention will be described with reference to FIGS.
FIG. 19 shows an outline of the configuration of the present embodiment.

  In the first embodiment, the lubricating oil of the lash adjuster 42 is discharged from the exhaust roller rocker arm 41 toward the intake roller rocker arm 31, so that the intake roller rocker arm 31 and the stem cap 21 </ b> A of the intake valve 21 are Lubricating oil is supplied to the contact portion.

On the other hand, in this embodiment, lubricating oil is supplied between the intake roller rocker arms 31 of the pair of intake valves 21 provided in each cylinder 13.
Here, with respect to the pair of intake valves 21 provided in each cylinder 13, the intake valve 21 located on the timing chain 14 side in the arrangement direction of the cylinders 13 is located on the opposite side to the first intake valve 21 </ b> X and the timing chain 14. The intake valve 21 is a second intake valve 21Y. The intake roller rocker arm 31 corresponding to the first intake valve 21X is a first intake roller rocker arm 31X, and the intake roller rocker arm 31 corresponding to the second intake valve 21Y is a second intake roller rocker arm 31Y. To do.

  In the engine 1 of the present embodiment, the lubricating oil of the lash adjuster 32 is discharged from the first intake roller rocker arm 31X to the second intake roller rocker arm 31Y, and the first intake roller rocker arm 31Y performs the first operation. The lubricating oil of the lash adjuster 32 is discharged toward the intake roller rocker arm 31X.

  Thereby, the contact portion between the first intake roller rocker arm 31X and the stem cap 21A of the first intake valve 21X and the contact portion between the second intake roller rocker arm 31Y and the stem cap 21A of the second intake valve 21Y are formed. On the other hand, a sufficient amount of lubricating oil can be supplied. Hereinafter, a structure for realizing such supply of lubricating oil will be described.

<Structure of roller rocker arm for intake [1]>
FIG. 20 shows a perspective structure of the first intake roller rocker arm 31 </ b> X and the lash adjuster 32.

  The lash adjuster 32 includes an adjuster main body 32A and a plunger 32B disposed on the main body 32A so as to be reciprocally movable. Lubricating oil for the engine 1 is supplied into the plunger 32 </ b> B of the lash adjuster 32. An oil hole 32C for allowing the internal lubricating oil to flow out is formed at the tip of the plunger 32B.

  In the arm main body 31A of the first intake roller rocker arm 31X, an adjuster mounting portion 31E is formed at the adjuster side end portion 31C. The adjuster mounting portion 31E is formed corresponding to the shape of the lash adjuster 32 on the distal end side of the plunger 32B. The plunger 32B is fitted into the adjuster mounting portion 31E.

  A cap attachment portion 31F is formed at the cap side end portion 31D of the arm main body 31A. A stem cap 21A of the first intake valve 21X is fitted into the cap attachment portion 31F. The stem cap 21A moves relative to the cap side end portion 31D in contact with the first intake roller rocker arm 31X.

FIG. 21 shows a front structure of the first intake roller rocker arm 31X as seen from the direction V5 in FIG.
FIG. 22 shows a planar structure of the first intake roller rocker arm 31X as seen from the direction V6 in FIG.

FIG. 23 shows a side structure of the first intake roller rocker arm 31X as seen from the direction V7 in FIG.
FIG. 24 shows a planar structure of the first intake roller rocker arm 31X as seen from the direction V8 in FIG.

  The first intake roller rocker arm 31X is formed with an oil passage 31H that communicates from the side surface facing the second intake roller rocker arm 31Y (opposite arm side surface 31G) to the adjuster mounting portion 31E.

  In the oil passage 31H, an opening (adjuster opening 31HA) located in the adjuster mounting portion 31E is formed at a position corresponding to the oil hole of the plunger 32B. Further, the opening (side opening 31HB) located on the side surface 31G on the opposite arm side faces the contact portion (or the vicinity thereof) between the second intake roller rocker arm 31Y and the stem cap 21A of the second intake valve 21Y. It is open.

  In a state where the plunger 32B of the lash adjuster 32 is fitted in the first intake roller rocker arm 31X, the oil passage 31H of the first intake roller rocker arm 31X and the oil hole 32C of the plunger 32B communicate with each other. Thereby, the lubricating oil in the plunger 32B is discharged to the outside of the rocker arm 31 through the oil hole 32C of the plunger 32B and the oil passage 31H of the first intake roller rocker arm 31X. The discharged lubricating oil is supplied to the contact portion between the second intake roller rocker arm 31Y and the stem cap 21A of the second intake valve 21Y.

  The second intake roller rocker arm 31Y is formed with an oil passage 31H that communicates from the side (opposite side 31G) facing the first intake rocker arm 31X to the adjuster mounting portion 31E.

  In the oil passage 31H, an opening (adjuster opening 31HA) located in the adjuster mounting portion 31E is formed at a position corresponding to the oil hole of the plunger 32B. Further, the opening (side opening 31HB) located on the side surface 31G on the opposite arm side faces the contact portion (or the vicinity thereof) between the first intake roller rocker arm 31X and the stem cap 21A of the first intake valve 21X. It is open.

  In a state where the plunger 32B of the lash adjuster 32 is fitted in the second intake roller rocker arm 31Y, the oil passage 31H of the second intake roller rocker arm 31Y and the oil hole 32C of the plunger 32B communicate with each other. Thereby, the lubricating oil in the plunger 32B is discharged to the outside of the rocker arm 31 through the oil hole 32C of the plunger 32B and the oil passage 31H of the second intake roller rocker arm 31Y. The released lubricating oil is supplied to the contact portion between the first intake roller rocker arm 31X and the stem cap 21A of the first intake valve 21X.

  In the engine 1 of the present embodiment, the amount of lubricating oil supplied to the lash adjuster 32 (plunger 32B) is set so that the valve clearance adjustment function by the lash adjuster 32 is appropriately maintained.

<Structure of roller rocker arm for intake [2]>
In the present embodiment, in order to supply more lubricating oil to the contact portion between the intake valve 21 and the stem cap 21A, the cap side of the first intake roller rocker arm 31X and the second intake roller rocker arm 31Y is used. The end 31D is configured as follows.

  FIG. 25 shows a perspective structure of the cap side end portion 31D of the first intake roller rocker arm 31X. This figure corresponds to a perspective structure of the cap side end portion 31D as seen from the direction V9 in FIG.

  In the cap side end portion 31D of the first intake roller rocker arm 31X, a notch 31I that opens the cap attachment portion 31F toward the second intake roller rocker arm 31Y is formed on the opposite side surface 31G. That is, the first intake roller rocker arm 31X is configured by removing a portion located on the cap attachment portion 31F from the side surface 31G on the opposite arm side.

  Thereby, the lubricating oil of the lash adjuster 32 released through the second intake roller rocker arm 31Y is supplied to the cap mounting portion 31F of the first intake roller rocker arm 31X through the notch 31I. More lubricating oil is supplied to the contact portion between the one intake roller rocker arm 31X and the stem cap 21A of the first intake valve 21X.

  In the cap side end portion 31D of the second intake roller rocker arm 31Y, a notch 31I that opens the cap attachment portion 31F toward the first intake roller rocker arm 31X is formed on the side surface 31G on the opposite arm side. In other words, the second intake roller rocker arm 31Y is configured by removing a portion located on the cap attachment portion 31F on the side surface 31G on the opposite arm side.

  Thereby, the lubricating oil of the lash adjuster 32 released through the first intake roller rocker arm 31X is supplied to the cap mounting portion 31F of the second intake roller rocker arm 31Y through the notch 31I. More lubricating oil is supplied to the contact portion between the two intake roller rocker arm 31Y and the stem cap 21A of the second intake valve 21Y.

  The structures of the cap side end portions 31D of the first intake roller rocker arm 31X and the second intake roller rocker arm 31Y can be changed as shown in FIG. That is, by forming the through hole 31J in place of the notch 31I, the cap mounting portion 31F can be opened toward the adjacent intake roller rocker arm 31.

<Effect of embodiment>
As described above in detail, according to the engine with a variable valve mechanism according to the second embodiment, in addition to the effects (1) and (2) according to the first embodiment, the following is shown. An effect comes to be acquired.

  (3) In the engine 1 of the present embodiment, the notch 31I or the through hole 31J is formed in the cap attachment portion 31F, so that the first intake roller rocker arm 31X and the stem cap 21A of the first intake valve 21X are formed. More lubricating oil can be supplied to the contact portion between the second intake valve 21Y and the stem cap 21A of the second intake valve 21Y.

  (4) In the engine 1 of the present embodiment, since the lubricant is supplied between the adjacent intake roller rocker arms 31, the intake valve 21 and the intake roller rocker arm are not obstructed by the roller 31B or the like. The lubricating oil can be supplied to the contact portion with 31.

<Example of change>
In addition, the said 2nd Embodiment can also be implemented as the following forms which changed this suitably, for example.

  In the second embodiment, the configuration for opening the cap mounting portion 31F toward the adjacent intake roller rocker arm 31 is not limited to the notch 31I and the through hole 31J exemplified in the embodiment, and can be changed as appropriate. can do.

  In the second embodiment, the oil passage 31H is formed so as to communicate from the opposite arm side surface 31G to the oil hole 32C. However, the oil passage 31H can be modified as follows, for example. That is, the oil passage 31H can be formed in such a manner that an oil hole different from the oil hole 32C is formed in the plunger 32B of the lash adjuster 32 and the arm side surface 31G communicates with the oil hole.

(Other embodiments)
In addition, elements that can be changed in common with each of the above embodiments are listed below.
-About the engine provided with the variable valve mechanism which changes the maximum valve lift amount of the exhaust valve 22, this invention can be applied with the aspect according to said each embodiment. That is, by applying the configuration of the exhaust roller rocker arm 41 of the first embodiment to the intake roller rocker arm 31, the exhaust valve 22 has operational effects similar to the operational effects of the first embodiment. Be able to Further, by applying the configuration of the pair of intake roller rocker arms 31 in the second embodiment to the pair of exhaust roller rocker arms 41, the exhaust valve 22 conforms to the effect of the second embodiment. The effect can be achieved.

  As the configuration for supplying the lubricating oil to the contact portion between the intake roller rocker arm 31 and the stem cap 21 </ b> A of the intake valve 21, the following configuration is adopted in addition to the configuration of each of the above embodiments. You can also. That is, the lubricating oil can be supplied from the oil supply hole formed in the base circle portion of the exhaust cam 26 to the contact portion.

  Further, in an engine provided with a variable valve mechanism that changes the maximum valve lift amount of the exhaust valve 22, the following configuration can be adopted. That is, the lubricating oil can be supplied from the oil supply hole formed in the base circle portion of the intake cam 25 to the contact portion between the exhaust roller rocker arm 41 and the stem cap 22 </ b> A of the exhaust valve 22.

  -In each above-mentioned embodiment, the composition of variable valve mechanism 5 is not restricted to the illustrated composition, and can be changed suitably. Similarly, the engine 1 is not limited to the exemplified configuration and can be appropriately changed.

The top view which shows the planar structure of the engine about 1st Embodiment which actualized the engine with a variable valve mechanism concerning this invention. The perspective view which shows the perspective structure about the valve mechanism main body and actuator which comprise the variable valve mechanism of the embodiment. The disassembled perspective view which shows the disassembled perspective structure about the valve lift mechanism which comprises the variable valve mechanism of the embodiment. The perspective view which shows the perspective structure about the slider gear which comprises the valve lift mechanism of the embodiment. Sectional drawing which shows the cross-sectional structure along an axial direction about the slider gear which comprises the valve lift mechanism of the embodiment. The perspective view which shows the perspective structure about the control shaft and rocker shaft which comprise the variable valve mechanism of the embodiment. The disassembled perspective view which shows the disassembled perspective structure about the variable valve mechanism of the embodiment. The partially broken perspective view which shows the internal structure about the valve lift mechanism which comprises the variable valve mechanism of the embodiment. Sectional drawing which shows the cross-section along the D1-D1 line | wire of FIG. 1 about the engine with a variable valve mechanism of the embodiment. The perspective view which shows the perspective structure about the roller rocker arm for exhaust, and the lash adjuster of the engine with a variable valve mechanism of the embodiment. The front view which shows the front structure seen from the V1 direction of FIG. 10 about the roller rocker arm for exhaust of the embodiment. The top view which shows the planar structure seen from the V2 direction of FIG. 10 about the roller rocker arm for exhaust of the embodiment. The side view which shows the side structure seen from the V3 direction of FIG. 10 about the roller rocker arm for exhaust of the embodiment. The top view which shows the planar structure seen from the V4 direction of FIG. 10 about the roller rocker arm for exhaust of the embodiment. The side view which shows the side structure of the state which assembled | attached the lash adjuster to the roller rocker arm for exhaust of the embodiment. Sectional drawing which shows the cross-section along the D15-D15 line | wire of FIG. 15 about the exhaust roller rocker arm and lash adjuster of the embodiment. Sectional drawing which shows a part of sectional structure along the D1-D1 line | wire of FIG. 1 about the engine with a variable valve mechanism of the embodiment. The top view which shows the planar structure of the state except each cam shaft and the variable valve mechanism about the engine with a variable valve mechanism of the embodiment. The top view which shows the planar structure of the state which excluded each camshaft and the variable valve mechanism about 2nd Embodiment which actualized the engine with the variable valve mechanism concerning this invention. The perspective view which shows the perspective structure about the roller rocker arm for intake and the lash adjuster of the engine with a variable valve mechanism of the embodiment. The front view which shows the front structure seen from the V5 direction of FIG. 20 about the roller rocker arm for intake of the embodiment. The top view which shows the planar structure seen from the V6 direction of FIG. 20 about the roller rocker arm for intake of the embodiment. The side view which shows the side structure seen from the V7 direction of FIG. 20 about the roller rocker arm for intake of the embodiment. The top view which shows the planar structure seen from the V8 direction of FIG. 20 about the roller rocker arm for intake of the embodiment. The perspective view which shows the perspective structure of a cap side edge part about the roller rocker arm for intake of the embodiment. The perspective view which shows the perspective structure of a cap side edge part about the roller rocker arm for intake of the embodiment.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Engine, 11 ... Cylinder block, 12 ... Cylinder head, 13 ... Cylinder, 14 ... Timing chain, 15 ... Intake cam shaft support wall, 16 ... Exhaust cam shaft support wall, 17 ... Rocker shaft support wall

  21 ... Intake valve, 21A ... Stem cap, 21X ... First intake valve, 21Y ... Second intake valve, 22 ... Exhaust valve, 22A ... Stem cap, 23 ... Intake camshaft, 24 ... Exhaust camshaft, 25 ... Intake cam 26 ... Exhaust cam.

  31 ... Roller rocker arm for intake, 31A ... Arm body, 31B ... Roller, 31C ... Adjuster side end, 31D ... Cap side end, 31E ... Adjuster mounting part, 31F ... Cap mounting part, 31G ... Side surface against arm side, 31H ... Oil passage, 31HA ... Adjuster opening, 31HB ... Front opening, 31I ... Notch, 31J ... Through hole, 31X ... First intake roller rocker arm, 31Y ... Second intake roller rocker arm, 32 ... Rush Adjuster, 32A ... adjuster body, 32B ... plunger, 32C ... oil hole, 32D ... body oil supply hole, 32E ... plunger oil supply hole, 33 ... valve spring.

  41 ... Exhaust roller rocker arm, 41A ... Arm body, 41B ... Roller, 41C ... Adjuster side end, 41D ... Cap side end, 41E ... Adjuster attachment, 41F ... Cap attachment, 41G ... Intake side, 41H ... Oil passage, 41HA ... Adjuster opening, 41HB ... Side opening, 42 ... Rush adjuster, 42A ... Adjuster body, 42B ... Plunger, 42C ... Oil hole, 42D ... Body oil supply hole, 42E ... Plunger oil supply hole, 43 ... Valve Spring.

  DESCRIPTION OF SYMBOLS 5 ... Variable valve mechanism, 5A ... Valve lift mechanism, 51 ... Valve mechanism main body, 52 ... Actuator, 53 ... Rocker shaft, 53A ... Long hole, 53B ... Rocker shaft outer peripheral surface, 53C ... Internal space, 54 ... Control shaft 54A: Insertion hole.

  6 ... Slider gear, 61 ... Slider gear input spline, 62 ... Slider gear first output spline, 63 ... Slider gear second output spline, 64 ... Through hole, 65 ... Circumferential groove, 66 ... Pin insertion hole, 67 ... Control pin 68 ... long hole, 69 ... bush, 69A ... through hole.

DESCRIPTION OF SYMBOLS 7 ... Input gear, 71 ... Input gear spline, 72 ... Input gear housing, 73 ... Input arm, 73A ... Shaft, 73B ... Roller, 73L ... Support arm, 73R ... Support arm
DESCRIPTION OF SYMBOLS 8 ... 1st output gear, 81 ... 1st output gear spline, 82 ... 1st output gear housing, 82A ... Base part, 82B ... Side wall, 83 ... 1st output arm, 83A ... Cam surface.

  DESCRIPTION OF SYMBOLS 9 ... 2nd output gear, 91 ... 2nd output gear spline, 92 ... 2nd output gear housing, 92A ... Base part, 92B ... Side wall, 93 ... 2nd output arm, 93A ... Cam surface.

Claims (12)

An intake roller rocker arm that opens and closes an intake valve, an exhaust roller rocker arm that opens and closes an exhaust valve, a lash adjuster that adjusts the valve clearance between the exhaust valve and the exhaust roller rocker arm, and a maximum of the intake valve In an engine with a variable valve mechanism having a variable valve mechanism for changing a valve lift amount,
An engine with a variable valve mechanism, wherein an oil passage is provided in the exhaust roller rocker arm for discharging the lubricating oil in the lash adjuster toward a contact portion between the intake valve and the intake roller rocker arm. . An intake roller rocker arm that opens and closes an intake valve, an exhaust roller rocker arm that opens and closes an exhaust valve, a lash adjuster that adjusts the valve clearance between the exhaust valve and the exhaust roller rocker arm, and a maximum of the intake valve In an engine with a variable valve mechanism having a variable valve mechanism for changing a valve lift amount,
Wherein the exhaust roller rocker arm, said intake roller rocker oil passage from the side located on the arm side communicating to an oil hole of the plunger of the lash adjuster provided Rutotomoni, the opening of the oil passage in the side surface the An engine with a variable valve mechanism, wherein an engine is opened toward a contact portion between an intake valve and the intake roller rocker arm . One cylinder has a plurality of intake valves, a plurality of intake roller rocker arms provided on each of the plurality of intake valves to open and close the intake valves, and valves of the intake valves and the intake roller rocker arms In an engine with a variable valve mechanism comprising a lash adjuster for adjusting the clearance and a variable valve mechanism for changing the maximum valve lift of the intake valve,
Each of the plurality of intake roller rocker arms is provided with an oil passage for releasing the lubricating oil in the lash adjuster toward the contact portion between the adjacent intake roller rocker arm and the intake valve. Engine with variable valve mechanism. One cylinder has a plurality of intake valves, a plurality of intake roller rocker arms provided on each of the plurality of intake valves to open and close the intake valves, and valves of the intake valves and the intake roller rocker arms In an engine with a variable valve mechanism comprising a lash adjuster for adjusting the clearance and a variable valve mechanism for changing the maximum valve lift of the intake valve,
For each of the plurality of intake roller rocker arms, an oil passage that communicates from a side surface facing an adjacent intake roller rocker arm to an oil hole of the plunger of the lash adjuster is provided, and the opening of the oil passage on the side surface is provided. An engine with a variable valve mechanism, wherein a portion is opened toward a contact portion between the adjacent intake roller rocker arm and the intake valve. The engine with a variable valve mechanism according to claim 3 or 4,
For each of the plurality of intake roller rocker arms, a part of a portion that covers an end portion of the intake valve is removed from a side surface facing an adjacent intake roller rocker arm. With engine. In the engine with a variable valve mechanism according to any one of claims 1 to 5,
The variable valve mechanism includes an axially movable slider gear, an input gear assembled to the slider gear and operated by a camshaft cam of the intake valve, and an intake gear assembled to the slider gear. An output gear for operating a roller rocker arm, and changing a relative phase difference between the input gear and the output gear through movement of the slider gear in the axial direction to change the maximum valve lift amount of the intake valve. An engine with a variable valve mechanism characterized by being a thing. An exhaust roller rocker arm that opens and closes an exhaust valve, an intake roller rocker arm that opens and closes an intake valve, a lash adjuster that adjusts the valve clearance between the intake valve and the intake roller rocker arm, and a maximum of the exhaust valve In an engine with a variable valve mechanism having a variable valve mechanism for changing a valve lift amount,
An engine with a variable valve mechanism, wherein an oil passage for discharging the lubricating oil in the lash adjuster toward a contact portion between the exhaust valve and the exhaust roller rocker arm is provided in the intake roller rocker arm. . An exhaust roller rocker arm that opens and closes an exhaust valve, an intake roller rocker arm that opens and closes an intake valve, a lash adjuster that adjusts the valve clearance between the intake valve and the intake roller rocker arm, and a maximum of the exhaust valve In an engine with a variable valve mechanism having a variable valve mechanism for changing a valve lift amount,
For the intake roller rocker arm, said from the side located on the exhaust roller rocker arm to an oil hole of the plunger of the lash adjuster is provided an oil passage communicating Rutotomoni, the opening of the oil passage in the side surface the An engine with a variable valve mechanism, wherein the engine is opened toward a contact portion between an exhaust valve and the exhaust roller rocker arm . One cylinder has a plurality of exhaust valves, a plurality of exhaust roller rocker arms provided on each of the plurality of exhaust valves to open and close the exhaust valves, and valves of the exhaust valves and the exhaust roller rocker arms In an engine with a variable valve mechanism comprising a lash adjuster for adjusting the clearance and a variable valve mechanism for changing the maximum valve lift of the exhaust valve,
Each of the plurality of exhaust roller rocker arms is provided with an oil passage for releasing the lubricating oil in the lash adjuster toward the contact portion between the adjacent exhaust roller rocker arm and the exhaust valve. Engine with variable valve mechanism. One cylinder has a plurality of exhaust valves, a plurality of exhaust roller rocker arms provided on each of the plurality of exhaust valves to open and close the exhaust valves, and valves of the exhaust valves and the exhaust roller rocker arms In an engine with a variable valve mechanism comprising a lash adjuster for adjusting the clearance and a variable valve mechanism for changing the maximum valve lift of the exhaust valve,
For each of the plurality of exhaust roller rocker arms, an oil passage that communicates from a side surface facing an adjacent exhaust roller rocker arm to an oil hole of the plunger of the lash adjuster is provided, and the opening of the oil passage on the side surface is provided. An engine with a variable valve mechanism, wherein a portion is opened toward a contact portion between the adjacent exhaust roller rocker arm and the exhaust valve. The engine with a variable valve mechanism according to claim 9 or 10,
For each of the plurality of exhaust roller rocker arms, a part of a portion that covers an end of the exhaust valve is removed from a side surface facing an adjacent exhaust roller rocker arm. With engine. The engine with a variable valve mechanism according to any one of claims 7 to 11,
The variable valve mechanism includes an axially movable slider gear, an input gear assembled to the slider gear and operated by a camshaft cam of the exhaust valve, and an exhaust gear assembled to the slider gear. An output gear for operating a roller rocker arm, and changing a relative phase difference between the input gear and the output gear through movement of the slider gear in the axial direction to change a maximum valve lift amount of the exhaust valve. An engine with a variable valve mechanism characterized by being a thing.

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