JP6069766B2 - Variable valve operating device for internal combustion engine - Google Patents

Description

  In the present invention, the first and second rocker arms arranged adjacent to each other while being linked and connected to the engine valve swing in different swinging modes when the rocker arms are not connected. And a connecting pin that is pivotally supported by the cylinder head via the rocker shaft and has a central axis parallel to the rocker shaft, and connects the two rocker arms across the first and second rocker arms. The second rocker arm is slidably fitted to the first and second rocker arms so that the first rocker arm can be moved between the first and second rocker arms to release the connection between the first and second rocker arms. A pressed portion is formed at one end of the connecting pin on the side opposite to the rocker arm, and faces the first rocker arm from the side opposite to the second rocker arm. In this way, the support rod provided on the cylinder head has a pressing rod that has a pressing portion that abuts against the pressed portion at the end on the side of the connecting pin, so that the connecting pin can be pressed. The present invention relates to a variable valve operating apparatus for an internal combustion engine supported so as to be movable in parallel directions.

  The first and second rocker arms arranged adjacent to each other are slidably fitted to the first rocker arm from the side opposite to the second rocker arm so that the connection and release of the rocker arms can be switched. A pressing rod, which is capable of pressing the connecting pin toward the connecting position, is opposed to the first rocker arm on the opposite side of the second rocker arm on the cylinder wall. A variable valve operating apparatus for an internal combustion engine that is supported by a provided support wall is known from Patent Document 1.

JP 2012-77633 A

  However, in the one disclosed in Patent Document 1, the connecting pin and the pressing rod swing with the first rocker arm with respect to the pressing rod that is at a fixed position in the direction orthogonal to the axis. In order to allow, the connecting pin and the pressing rod are in contact with each other in the space between the first rocker arm and the support wall, and the distance between the first rocker arm and the support wall is relatively large, so that the rigidity of the support wall is increased. To increase the thickness of the support wall, increasing the thickness of the support wall leads to an increase in the size of the cylinder head.

  The present invention has been made in view of such circumstances, and it is possible to increase the rigidity of a support wall with a structure capable of avoiding an increase in the size of a cylinder head, and an internal combustion engine in which a connecting pin and a pressing rod are brought into contact with each other. An object of the present invention is to provide a variable valve gear for an engine.

To achieve the above object, according to the present invention, the first and second rocker arms, which are arranged adjacent to each other while at least one of them is linked and connected to the engine valve, are different from each other in a non-connected state of the rocker arms. A connecting pin that is swingably supported by the cylinder head via the rocker shaft while swinging in a swinging manner and has a central axis parallel to the rocker shaft spans between the first and second rocker arms. The first and second rocker arms are slidably fitted so that they can be moved between the connection position for connecting the two rocker arms and the connection between the first rocker arm and the first rocker arm. And a pressed portion is formed at one end of the connecting pin on the side opposite to the second rocker arm, and the first rocker arm from the side opposite to the second rocker arm. A support rod provided on the cylinder head so as to face the arm, and a pressing rod having a pressing portion abutting on the pressed portion at an end on the side of the connecting pin can press the connecting pin. In the variable valve operating apparatus for an internal combustion engine that is supported so as to be movable in a direction parallel to the rocker shaft, an accommodation hole for bringing the pressing portion of the pressing rod into contact with the pressed portion of the connecting pin has a swing of the first rocker arm. A fitting hole that is formed inside the first rocker arm so as to allow relative movement of the pressing rod with respect to movement and slidably fits the connecting pin accommodates the stepped portion facing the second rocker arm. provided in the first rocker arm so as to form between the holes, a return spring for biasing the connecting pin to the connecting release position is a Rukoto provided in the second rocker arm first Japanese To.

According to the present invention, in addition to the configuration of the first feature, the accommodation hole and the fitting hole communicate with each other, and the accommodation hole is located below the fitting hole in the vertical direction of the vehicle. The second feature is that it is formed.

According to the present invention, in addition to the configuration of the first or second feature, the receiving hole may prevent the pressing rod from interfering with an inner wall surface of the receiving hole in the maximum lift state and the minimum lift state of the first rocker arm. A third feature is that the substrate is formed to have a size.

In the present invention, in addition to any of the configurations of the first to third features, the area of the pressing portion of the pressing rod is set smaller than the area of the pressed portion of the connecting pin. This is the fourth feature.

The present invention, in addition to any one of the first to fourth aspect, the connecting pin, to be formed to Ren'nara continuously its outer peripheral surface over the axial direction between both ends of the 5 Features.

In the present invention, in addition to any one of the first to fifth features, the pressing rod is formed so as to continuously connect at least an outer peripheral surface extending from the axially intermediate portion to the pressing portion. Is a sixth feature.

According to the present invention, in addition to any of the configurations of the first to sixth features, the center axis of the pressing rod is disposed offset to the rocker shaft side with respect to the center axis of the connecting pin. 7 features .

According to the present invention, in addition to any one of the first to seventh features, the fitting hole and the receiving hole having a circular cross-sectional shape may be configured such that the central axis is more than the central axis of the fitting hole. The eighth feature is that the first rocker arm is connected to the first rocker arm while being offset toward the rocker shaft.

Furthermore, the present invention provides a pressure rod support hole penetrating the support wall so that the pressure rod is slidably fitted to the support wall in addition to any of the first to eighth features. And a rocker shaft support hole for inserting and supporting the rocker shaft, and the pressing rod is formed in a shape that can be inserted into the pressing rod support hole from the side opposite to the first rocker arm. The ninth feature is provided.

The present invention further includes an actuator having an output rod that presses the pressing rod in addition to the configuration of the ninth feature, and a guide cylinder that guides the axial movement of the output rod includes the cylinder head and the cylinder head. A tenth feature is that the pressure rod is provided at a position overlapping with the pressure rod on a projection plane perpendicular to the central axis of the pressure rod so as to penetrate the inside and outside of the valve operating chamber formed between the head covers coupled to the pressure rod. And

  According to the first feature of the present invention, the connecting pin and the pressing rod are brought into contact with each other in the accommodation hole formed in the first rocker arm, so that the support wall of the cylinder head is disposed close to the first rocker arm. Even if the thickness of the support wall is increased to increase the rigidity, an increase in the size of the cylinder head can be avoided.

In addition, since the fitting hole provided in the first rocker arm so as to slidably fit the connecting pin forms a stepped portion facing the second rocker arm, the connecting pin is formed in the stepped portion. The movement of the connecting pin toward the support wall side of the cylinder head can be restricted by abutting against the connecting head, and the connecting pin can be prevented from falling off from the first rocker arm.

According to the fourth feature of the present invention, since the area of the pressing portion of the pressing rod is smaller than the area of the pressed portion of the connecting pin, the pressing rod can be reduced in size and the receiving hole can be made smaller. Thus, the first rocker arm can be reduced in size.

According to the fifth feature of the present invention, since the outer peripheral surface of the connecting pin is continuously connected across both axial ends, the shape of the connecting pin is simplified to improve productivity and reduce costs. Can do.

According to the sixth aspect of the present invention, since the outer peripheral surface extending continuously from at least the axial intermediate portion to the pressing portion of the pressing rod is continuously connected, the component shape on at least the pressing portion side of the pressing rod is simplified. In addition, the accommodation hole can be formed small.

According to the seventh feature of the present invention, since the central axis of the pressing rod is offset to the rocker shaft side with respect to the central axis of the connecting pin, the relative movement amount between the first rocker arm and the pressing rod can be reduced. The accommodation hole can be made small .

According to an eighth aspect of the present invention, the fitting hole and the accommodation hole having a circular cross-sectional shape are offset from each other by offsetting the central axis of the accommodation hole to the rocker shaft side with respect to the central axis of the fitting hole. Therefore, it is possible to make the first rocker arm compact while easily forming a step portion that restricts the movement of the connecting pin toward the support wall side of the cylinder head.

Furthermore, according to the ninth feature of the present invention, the press rod can be inserted into the press rod support hole provided in the support wall from the side opposite to the first rocker arm, so that the press rod is assembled and removed from the support wall. Can be easily performed.

1 is a side view of a motorcycle. It is a cross-sectional top view of the principal part of a power unit. FIG. 3 is a view taken in the direction of arrow 3 in FIG. FIG. 4 is a cross-sectional view taken along line 4-4 of FIG. FIG. 5 is a sectional view taken along line 5-5 of FIG. It is a principal part enlarged view of FIG.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying FIGS. In the following description, front and rear, left and right, and top and bottom refer to directions viewed from a passenger who rides a saddle-ride type vehicle.

  First, in FIG. 1, a vehicle body frame F of a scooter type motorcycle has a front pipe 11 that supports a front fork 11 that pivotally supports a front wheel WF and a steering handle 12 that is connected to the front fork 11 so as to be steerable. The power unit P that exhibits the power for driving the rear wheel WR is supported at the middle part of the vehicle body frame F so as to be swingable up and down.

  The power unit P includes an internal combustion engine E disposed in front of the rear wheel WR and a transmission M that transmits the output of the internal combustion engine E to the rear wheel WR. The transmission M is an engine body of the internal combustion engine E. 14, a rear cushion unit 16 is provided between a rear portion of the transmission case 15 and a rear portion of the vehicle body frame F.

  The vehicle body frame F and a part of the power unit P are a vehicle body cover 17 having a pair of left and right footrests 18 on which occupants' feet are placed, and a floor tunnel portion 19 protruding upward between the footrests 18. The vehicle body cover 17 is covered and attached to the vehicle body frame F. Also, an occupant seat 20 disposed behind the floor tunnel portion 19 and a passenger seat 21 disposed behind the occupant seat 20 are disposed on the vehicle body cover 17.

  2 and 3 together, the engine main body 14 of the internal combustion engine E is slidable with a crankcase 25 that rotatably supports a crankshaft 24 having an axis extending in the vehicle width direction, and a piston 29. A cylinder block 26 having a cylinder bore 30 to be fitted to the cylinder case 26 and coupled to the crankcase 25; a cylinder head 27 coupled to the cylinder block 26; and a head cover 28 coupled to the cylinder head 27. The cylinder axis C of the engine main body 14, that is, the axis of the cylinder bore 30 is slightly inclined forward and the piston 29 is connected to the crankshaft 24.

  An intake device 32 for supplying air to a combustion chamber 31 formed between the cylinder block 26 and the cylinder head 27 so as to face the top of the piston 29 is above the transmission case 15 on the left side of the rear wheel WR. And an air cleaner 33 supported by the transmission case 15 and a throttle body 34 disposed between the air cleaner 33 and the cylinder head 27, and a fuel injection valve 35 is provided on the upper side wall of the cylinder head 27. Mounted.

  As shown in FIG. 1, an exhaust device 36 for discharging exhaust gas from the combustion chamber 31 is connected to the lower side wall of the cylinder head 27, and the exhaust device 36 is connected to the lower side wall of the cylinder head 27. An exhaust pipe 37 extending rearward from the engine main body 14 to the rear, and an exhaust muffler (not shown) disposed on the right side of the rear wheel WR so as to be connected to the downstream end of the exhaust pipe 37 Is provided.

  The crankcase 25 is composed of a first case half 38 on the right side and a second case half 39 on the left side coupled to each other, and at the right end portion of the crankshaft 24 rotatably passing through the first case half 38. The outer rotor 40 is fixed, and the inner stator 41 surrounded by the outer rotor 40 so as to form the generator 42 together with the outer rotor 40 is fixed to the support plate 43 fastened to the first case half 38. .

  A cylindrical generator cover 44 surrounding the generator 42 is coupled to the first case half 38, and a radiator 45 is disposed on the right side of the generator cover 44. A cooling fan 46 for allowing cooling air to flow through the radiator 45 is fixed to the crankshaft 24 so as to be disposed between the generator 42 and the radiator 45.

  The transmission M accommodated in the transmission case 15 so as to transmit the rotational power of the crankshaft 24 to the rear wheel WR side is a V-belt that continuously changes the rotational power transmitted from the crankshaft 24. Type continuously variable transmission 48 and a reduction gear mechanism (not shown) for reducing the rotational power of V-belt type continuously variable transmission 48 and transmitting it to axle 50 (see FIG. 1) of rear wheel WR.

  The drive pulley 51 of the V-belt type continuously variable transmission 48 is provided on the crankshaft 24 so that the winding diameter of the V-belt 52 is variable, a fixed sheave 53 fixed to the crankshaft 24, and the crank The movable sheave 54 is supported by the crankshaft 24 so as to be close to and away from the fixed sheave 53 in a direction along the axis of the shaft 24, and the movable sheave 54 is closer to the crankcase 25 than the fixed sheave 53. Be placed.

  The movable sheave 54 is driven closer to the fixed sheave 53 in response to an increase in the rotational speed of the crankshaft 24 by the action of the centrifugal shift mechanism 55, and the centrifugal shift mechanism 55 The weight 58 is held between a cam surface 56 formed on the movable sheave 53 and a weight holding plate 57 fixed to the crankshaft 24.

  4 and 5, the cylinder head 27 includes a pair of intake valves 61 for performing intake control from the intake device 32 to the combustion chamber 31, and the exhaust from the combustion chamber 31. A pair of exhaust valves 62 for performing exhaust control to the device 36 are disposed so as to be able to open and close, both intake valves 61 are urged in a valve closing direction by valve springs 63, and both exhaust valves 62 are valve springs 64. Is urged in the valve closing direction. An ignition plug 65 is attached to the left side wall of the cylinder head 27 so that the tip of the combustion chamber 31 is exposed. A recess 66 for disposing the ignition plug 65 is provided on the outer surface of the left side wall of the cylinder head 27. It is formed.

  A valve operating chamber 67 formed between the cylinder head 27 and the head cover 28 accommodates a valve operating device 68 that opens and closes the intake valve 61 and the exhaust valve 62.

  The valve operating device 68 includes a single camshaft 70 disposed between the intake valves 61 and the exhaust valves 62 in common to the intake valves 61 and the exhaust valves 62, the intake valves 61, and the camshafts. 70, first and second intake side rocker arms 71, 72 interposed between the two exhaust valves 62 and a single exhaust side rocker arm 73 interposed between the camshafts 70.

  An intermediate portion of the exhaust side rocker arm 73 is supported so as to be swingable by an exhaust side rocker shaft 74 having an axis parallel to the camshaft 70, and one end portion of the exhaust side rocker arm 73 is provided on the camshaft 70. A roller 76 that is in rolling contact with the exhaust side cam 75 is pivotally supported, and a pair of connecting arm portions 73 a and 73 b individually corresponding to the exhaust valves 62 are integrally provided at the other end of the exhaust side rocker arm 73. Tappet screws 77 and 77 that are in contact with the stem ends 62a of the exhaust valves 62 are screwed into the connecting arm portions 73a and 73b so that the forward / backward positions can be adjusted.

  The first and second intake side rocker arms 71 and 72 are arranged adjacent to each other in the direction along the axis of the camshaft 70 so that at least one of them is linked and connected to the intake valve 61 which is an engine valve. . In this embodiment, the first and second intake side rocker arms 71 and 72 are individually linked and connected to the pair of intake valves 61, and the intake side rocker shaft 78 has an axis parallel to the camshaft 70. It is supported so that it can swing. That is, tappet screws 79 and 79 that are in contact with the stem end 61a of the intake valve 61 are screwed into one end portions of the first and second intake side rocker arms 71 and 72 so that the forward and backward positions can be adjusted.

  A roller 82 that is in rolling contact with the first intake side cam 80 provided on the camshaft 70 is pivotally supported at the other end of the first intake side rocker arm 71, and the other end of the second intake side rocker arm 72 is supported at the other end. A cam slipper 83 that contacts a second intake side cam 81 provided on the camshaft 70 is provided.

  The second intake-side cam 81 is substantially connected to and connected to the second intake-side rocker arm 72 of the pair of intake valves 61 when the first and second intake-side rocker arms 71 and 72 are disconnected. However, it has an outer peripheral surface that opens the intake valve 61 slightly in order to prevent fuel accumulation when the intake valve 61 is completely closed. It is formed as follows. That is, the first and second intake-side rocker arms 71 and 72 are swingably supported on the cylinder head 27 via the intake-side rocker shaft 78 while swinging in mutually different swinging modes in the unconnected state. Is done.

  The camshaft 70 is disposed at positions spaced apart in the direction along the axis of the camshaft 70 and is rotatable on first and second support walls 85 and 86 that project integrally with the cylinder head 27. Supported. The first and second support walls 85 and 86 are formed to extend long in a direction perpendicular to the axes of the camshaft 70, the intake side rocker shaft 78, and the exhaust side rocker shaft 74. 86, stud bolts 87, 87: 88, 88 for connecting the cylinder block 26 and the cylinder head 27 to the crankcase 25 are arranged at both ends in the longitudinal direction, respectively.

  Of the two end portions of the camshaft 70, the end portion protruding from the second support wall 86 disposed on the right side has a rotational power of the crankshaft 24 through a timing transmission mechanism 89 at a reduction ratio of 1/2. Decelerated and transmitted. The timing transmission mechanism 89 includes a drive sprocket 90 (see FIG. 2) fixed to the crankshaft 24, a driven sprocket 91 fixed to the right end portion of the camshaft 70 protruding from the second support wall 86, and Further, a cam chain passage 93 is formed in the cylinder block 26 and the cylinder head 27 so as to run on the right side of the cylinder bore 30 so that the cam chain 92 travels. The

  A water pump 94 is attached to the right side wall of the cylinder head 27, and a pump shaft 95 of the water pump 94 crosses the cam chain passage 93 and is coaxially and relative to the right end portion of the camshaft 70. It is non-rotatably connected.

  The intake side rocker shaft 78 and the exhaust side rocker shaft 74 are disposed on both sides of the camshaft 70, and both end portions of the intake side rocker shaft 78 and the exhaust side rocker shaft 74 are first and second support walls. 85 and 86 are fitted and supported.

  The first and second intake-side rocker arms 71 and 72 are provided with the cam slipper 83 of the second intake-side rocker arm 72 regardless of the first intake-side rocker arm 71 that swings following the first intake-side cam 80. 2 When the internal combustion engine E is kept in contact with the intake side cam 81, one intake valve 61 is substantially closed and stopped while the other intake valve 61 is cam-profiled with the first intake side cam 80. When the internal combustion engine E is operated at high speed by connecting the first and second intake side rocker arms 71 and 72 to the cam profile of the first intake side cam 80. A valve operating characteristic changing means 96 is provided for switching between a state of opening and closing in a corresponding operation mode.

  Referring also to FIG. 6, the valve operating characteristic changing means 96 is provided above the first and second intake side rocker arms 71 and 72 between the intake side rocker shaft 78 and the camshaft 70. The first and second intake-side rocker arms 72 are separated from the second intake-side rocker arm 72 and the first and second intake-side rocker arms 71 and 72 are connected to each other. A first axis having a central axis parallel to the intake side rocker shaft 78 while allowing movement between the connection release positions on the first intake side rocker arm 71 side where the connection of the intake side rocker arms 71 and 72 is released. The first connecting pin 97 slidably fitted to the second intake side rocker arms 71 and 72 and the first connection pin 97 slidably fitted to the second intake side rocker arm 72 and the first The second connection pin 98 connected to the connection pin 97 and the second connection pin 98 and the second intake side rocker arm 72 so as to exert a spring force that urges the first connection pin 97 toward the connection release side. And a return spring 99.

  The first intake side rocker arm 71 is provided with a first fitting hole 100 having an axis parallel to the intake side rocker shaft 78, and the second intake side rocker arm 72 is parallel to the intake side rocker shaft 78. A bottomed second fitting hole 101 having an end wall 101a on the side opposite to the first intake side rocker arm 71 while having an axis is provided. Moreover, the first and second fitting holes 100 and 101 are formed to have the same diameter with a circular cross section so as to be coaxially connected at the timing when the intake valve 61 is in the closed state.

  The first connecting pin 97 can be slidably fitted into the first and second fitting holes 100 and 101, and can be pressed at one end opposite to the second intake side rocker arm 72. While having 97a, the outer peripheral surface is formed in a short cylindrical shape so as to be continuously connected across both axial ends. The second connecting pin 98 is formed in a bottomed cylindrical shape with the end wall 101a side of the second fitting hole 101 open, and is slidably fitted into the second fitting hole 101. Between the second connecting pin 98 and the end wall 101a, the first and second connecting pins 97 and 98 that are in contact with each other are urged toward one side in the axial direction (the right side in FIGS. 4 and 6). The return spring 99 is contracted. In addition, the second intake side rocker arm 72 has a communication hole 102 that communicates the portion close to the end wall 101 a that is the closed end of the second fitting hole 101 to the outside so as to cross the second fitting hole 101. Provided.

  The valve operating characteristic changing means 96 is engaged with the first and second intake sides by fitting a part of the first connecting pin 97 into the second fitting hole 101 against the spring force of the return spring 99. The rocker arms 71 and 72 are connected, and the first and second connecting pins 97 and 98 are contacted by the spring force of the return spring 99 until the contact surfaces are arranged between the first and second intake side rocker arms 71 and 72. By moving the second connecting pins 97 and 98 in the axial direction, the connection between the first and second intake side rocker arms 71 and 72 is released.

  On the first support wall 85 facing the first intake side rocker arm 71 from the side opposite to the second intake side rocker arm 72, a pressing portion 104 a that contacts the pressed portion 97 a at one end of the first connecting pin 97 is provided. The pressing rod 104 at the end of the connecting pin 97 side allows the first connecting pin 97 to be pressed toward the connecting position, and is supported so as to be movable in a direction parallel to the intake side rocker shaft 78. In this embodiment, the first end of the intake side rocker shaft 78 is inserted and supported so as to extend in parallel with the rocker shaft support hole 105 provided in the first support wall 85. The pressing rod 104 is slidably fitted into the pressing rod support hole 106 provided in the support wall 85.

  Moreover, the pressing rod 104 is formed so as to continuously connect at least the outer peripheral surface extending from the intermediate portion in the axial direction to the pressing portion. In this embodiment, the pressing rod 104 has an outer diameter. Is formed constant over the entire axial length.

  On the left side wall of the cylinder head 27 opposite to the first intake side rocker arm 71 with respect to the first support wall 85, a housing 108 of a solenoid 107 as an actuator is provided with a plurality of mounting plates 109 fixed to the housing 108. For example, three bolts 110 are used for fastening.

The solenoid 107 has an output rod 111 protruding in an ON state by its excitation, and a guide cylinder 112 fixed to the housing 108 to guide the axial movement of the output rod 111 is provided on the cylinder head 27. The left side wall penetrates liquid-tightly and enters the valve operating chamber 67, and the projecting end of the output rod 111 from the tip of the guide cylinder 112 abuts on one end of the pressing rod 104 coaxially. The guide tube 112 is provided at a position overlapping the pressing rod 104 on a projection plane orthogonal to the central axis of the pressing rod. The output rod 111 may be formed so as to be continuous with the pressing rod 104.

  By pressing the pressing rod 104 by the solenoid 107, the pressing force acts on the first connecting pin 97 from the pressing rod 104, and the first and second connecting pins 97 and 98 move to the connecting position side. In the OFF state due to the demagnetization of the solenoid 107, the first and second connection pins 97 and 98 are moved to the connection release position only by the spring force of the return spring 99.

Inside the first intake side rocker arm 71 in the direction along the axis of the intake side rocker shaft 78, a contact portion between the pressed portion 97a of the first connecting pin 97 and the pressing portion 104a of the pressing rod 104 is provided. A receiving hole 113 is formed so as to allow relative movement of the pressing rod 104 with respect to the swing of the first rocker arm. That is, the receiving hole 113 is formed to have a size such that the pressing rod 104 does not interfere with the inner wall surface of the receiving hole 113 in the maximum lift state and the minimum lift state of the first intake side rocker arm 71.

The first fitting hole 100 for slidably fitting the first connecting pin 97 communicates with the accommodation hole 113 and has a stepped portion 114 facing the second intake side rocker arm 72 side with the accommodation hole 113. The first fitting hole 100 having a circular cross-sectional shape and the receiving hole 113 are provided in the first intake side rocker arm 71 so as to be formed in between, and the central axis C1 of the receiving hole 113 is The first intake side rocker arm 71 is connected to the first intake side rocker arm 71 while being offset from the central axis C2 of the first fitting hole 100 toward the intake side rocker shaft 78 side. Moreover, the accommodation hole 113 is formed below the first fitting hole 100 in the vertical direction of the vehicle.

  The area of the pressing portion 104a of the pressing rod 104 is set smaller than the area of the pressed portion 97a of the first connecting pin 97. In this embodiment, the area is the same over the entire axial length. The pressing rod 104 having an outer diameter is formed to have a larger diameter and a smaller diameter than the first connecting pin 97 having the same outer diameter over the entire length in the axial direction.

  In addition, the central axis C3 of the pressing rod 104 is arranged offset from the central axis C1 of the first connecting pin 97, that is, the central axis C2 of the first fitting hole 100 toward the intake rocker shaft 78. In this embodiment, the central axis C3 of the pressing rod 104 and the central axis C1 of the receiving hole 113 are offset from each other, but the central axes C3 and C1 may be arranged coaxially.

  By the way, on the inner surface of the upper wall of the cylinder head 27 so as to be positioned above the valve operating device 68, there are provided lubricating oil injection holes 116 arranged at a plurality of positions spaced in the axial direction of the camshaft 70. The first oil passage 117 extending in parallel with the axis of the camshaft 70 is provided on the upper side wall of the cylinder head 27 so that the lubricating oil ejection holes 116 communicate with each other. Of the stud bolts 88 disposed at both ends in the longitudinal direction of the second support wall 86, the outer periphery of the upper stud bolt 88 and the cylinder block 26 and the cylinder head 27 are provided so that the stud bolt 88 can be inserted. An annular oil passage 119 for guiding lubricating oil from an oil pump disposed on the crankcase 25 side is formed between the inner periphery of the bolt insertion hole 118, and this annular oil passage 119 is connected to the first oil passage 117. A connecting oil passage 120 communicating with the cylinder head 27 is provided on the upper side wall of the cylinder head 27.

  On the first support wall 85 side, the cylinder head 27 is provided with a second oil passage 121 that guides the lubricating oil from the first oil passage 117 between the first support wall 85 and the left end portion of the camshaft 70.

  Next, the operation of this embodiment will be described. Between the connection position where the first and second intake side rocker arms 71, 72 are connected and the connection release position where the connection between the first and second intake side rocker arms 71, 72 is released. The first connection pin 97 that enables the movement of the second intake side rocker arm 71 and 72 is slidably fitted to the first and second intake side rocker arms 71 while being biased toward the connection release position side. The pressing rod 104 having a pressing portion 104 a that contacts the pressed portion 97 a formed at one end of the first connecting pin 97 on the opposite side is connected to the first intake-side rocker arm 71 from the opposite side to the second intake-side rocker arm 72. The first connection pin 97 is supported by the first support wall 85 provided on the cylinder head 27 so that the first connection pin 97 can be pressed toward the connection position. However, the receiving hole 113 for bringing the pressing portion 104a of the pressing rod 104 into contact with the pressed portion 97a of the first connecting pin 97 has the pressing rod 104 with respect to the swing of the first intake side rocker arm 71. Since it is formed inside the first intake side rocker arm 71 in a direction along the axis of the intake side rocker shaft 78 so as to allow relative movement, the first support wall 85 is brought close to the first intake side rocker arm 71. Even if the thickness of the first support wall 85 is increased to increase the rigidity, it is possible to avoid an increase in the size of the cylinder head 27.

  In addition, since the area of the pressing portion 104a included in the pressing rod 104 is set to be smaller than the area of the pressed portion 97a included in the first connecting pin 97, the pressing rod 104 can be downsized. It is possible to reduce the size of the first intake side rocker arm 71 by reducing the size of the accommodation hole 113.

  Further, since the first connecting pin 97 is formed so that the outer peripheral surface thereof is continuously connected across both ends in the axial direction, the part shape of the first connecting pin 97 is simplified to improve productivity and cost. You can go down.

  Further, the pressing rod 104 is formed so as to continuously connect at least the outer peripheral surface extending from the intermediate portion in the axial direction to the pressing portion 104a. In this embodiment, the pressing rod 104 has an outer diameter thereof. Since it is formed constant over the entire length in the axial direction, it is possible to simplify the part shape of at least the pressing portion 104a side of the pressing rod 104 and to form the receiving hole 113 small.

  Further, since the central axis C3 of the pressing rod 104 is offset from the central axis C2 of the first connecting pin 97 toward the intake side rocker shaft 78, the first intake side rocker arm 71, the pressing rod 104, Relative movement amount can be reduced, and the accommodation hole 113 can be reduced.

A first fitting hole 100 for slidably fitting the first connecting pin 97 to the first intake side rocker arm 71 communicates with the accommodation hole 113 and faces the second intake side rocker arm 72 side. Since the portion 114 is provided so as to be formed between the housing hole 113, the first connection pin 97 biased toward the connection release position is brought into contact with the stepped portion 114, thereby moving toward the connection release position. The movement of the first connecting pin 97 can be restricted, and the first connecting pin 97 can be prevented from falling off the first intake side rocker arm 71. Moreover, since the accommodation hole 113 is formed below the first fitting hole 100 in the vertical direction of the vehicle , the first intake side when the first connection pin 97 moves to the connection release position side. Lubricating oil between the rocker arm 71 and the first connecting pin 97 can be easily released to the outside from the accommodation hole 113, and the resistance of the lubricating oil at a low temperature can be reduced.

  Further, the first fitting hole 100 and the accommodation hole 113 having a circular cross-sectional shape have a central axis C1 of the accommodation hole 113 closer to the intake side rocker shaft 78 than the central axis C2 of the first fitting hole 100. The first intake side rocker arm 71 is connected to the first intake side rocker arm 71 while being offset from each other, so that a step 114 that restricts the movement of the first connection pin 97 to the connection release position side is easily formed, and the first intake side The rocker arm 71 can be made compact.

  Further, the pressure rod support hole 106 penetrating the first support wall 85 and the intake side rocker shaft 78 are inserted and supported so that the pressure rod 104 is slidably fitted into the first support wall 85. The rocker shaft support hole 105 is formed in parallel, and the pressure rod 104 is formed in a shape that can be inserted into the pressure rod support hole 106 from the side opposite to the first intake side rocker arm 71. By allowing the pressure rod 104 to be inserted into the pressure rod support hole 106 of the support wall 85 from the side opposite to the first intake side rocker arm 71, it is easy to assemble and remove the pressure rod 104 from the first support wall 85. Can be done.

  The second intake-side rocker arm 72 has a second fitting hole 101 formed in a bottom so that a second connecting pin 98 contacting the first connecting pin 97 can be slidably fitted. Is formed on the first intake side rocker arm 71 side, and a communication hole 102 is provided in the second intake side rocker arm 72 for connecting the inside of the second fitting hole 101 near the closed end to the outside. The lubricating oil between the second connecting pin 98 and the second intake side rocker arm 72 can be easily released from the second intake side rocker arm 72 during the movement to the side, and the resistance due to the lubricating oil at a low temperature can be reduced.

  Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various design changes can be made without departing from the present invention described in the claims. Is possible.

  For example, in the above-described embodiment, the case where the intake valve 61 is used as the engine valve has been described. However, the present invention can also be applied to the case where the exhaust valve 62 is used as the intake valve.

  In the above-described embodiment, the case where the solenoid 107 is used as the actuator has been described. However, it is also possible to use an actuator that operates by hydraulic pressure.

27 ... Cylinder head
28 ... Head cover 61 ... Intake valve which is an engine valve
67 ... Valve chamber 71 ... First intake side rocker arm 72 ... Second intake side rocker arm 78 ... Intake side rocker shaft 85 ... Support wall 97 ... First connecting pin 97a ..Pressed parts
99 ... Return spring 100 ... First fitting hole 105 ... Rocker shaft support hole 106 ... Pressing rod support hole
107 ... Actuator
111 ... Output rod
112 ... guide cylinder 113 ... accommodating hole 104 ... pressing rod 104a ... pressing portion 114 ... stepped portion C1 ... center axis C2 of accommodating hole ... first connecting pin and first 1 center axis of fitting hole C3... Center axis of pressing rod

Claims (10)

The first and second rocker arms (71, 72) at least one of which is linked and connected to the engine valve (61) and arranged adjacent to each other are mutually connected when the rocker arms (71, 72) are not connected. A connecting pin having a central axis (C2) parallel to the rocker shaft (78) and supported by the cylinder head (27) via the rocker shaft (78) while swinging in different swing modes. (97) extends between the first and second rocker arms (71, 72) to connect the two rocker arms (71, 72), and the second rocker arm (72) separates from both the rocker arms (71, 72). 72) and the second rocker arm (72) is slidably fitted to the first and second rocker arms (71, 72) to enable movement between the connection release positions for releasing the connection of 72). Is formed with a pressed portion (97a) at one end portion of the connecting pin (97) on the opposite side, and is opposed to the first rocker arm (71) from the opposite side to the second rocker arm (72). 27) A pressing rod (104) having a pressing portion (104a) in contact with the pressed portion (97a) at an end portion on the connecting pin (97) side on a support wall (85) provided on the connecting pin (97). (97) In the variable valve operating system for an internal combustion engine supported so as to be able to press and move in a direction parallel to the rocker shaft (78),
The receiving hole (113) for bringing the pressing portion (104a) of the pressing rod (104) into contact with the pressed portion (97a) of the connecting pin (97) is the pressing rod against the swing of the first rocker arm (71). Formed in the first rocker arm (71) to allow relative movement of (104) ,
The fitting hole (100) into which the connecting pin (97) is slidably fitted forms a step (114) facing the second rocker arm (72) between the accommodation hole (113). Provided to the first rocker arm (71),
The connection pin (97) back biases the connection release position the spring (99) is a variable valve device for an internal combustion engine, characterized in Rukoto provided in the second rocker arm (72). The accommodation hole (113) and the fitting hole (100) communicate with each other, and the accommodation hole (113) is formed below the fitting hole (100) in the vertical direction of the vehicle. The variable valve operating apparatus for an internal combustion engine according to claim 1. The receiving hole (113) has a size such that the pressing rod (104) does not interfere with the inner wall surface of the receiving hole (113) in the maximum lift state and the minimum lift state of the first rocker arm (71). The variable valve operating apparatus for an internal combustion engine according to claim 1, wherein the variable valve operating apparatus is formed. Said push rod (104) the pressing portion has an area of (104a), according to claim 1 characterized in that said set smaller than the area of the pressed portion (97a) of said connecting pin (97) has - 4. The variable valve operating apparatus for an internal combustion engine according to claim 1 . The internal combustion engine according to any one of claims 1 to 4, wherein the connecting pin (97) is formed so that its outer peripheral surface is continuously connected across both axial ends. Variable valve device. Said push rod (104) is at least the pressing portion of the axially intermediate portion of any one of claim 1 to 5, characterized by being formed so as to Ren'nara continuously peripheral surface over (104a) A variable valve operating apparatus for an internal combustion engine according to claim 1. The center axis (C3) of the pressing rod (104) is disposed offset from the center axis (C2) of the connecting pin (97) toward the rocker shaft (78). The variable valve operating apparatus for an internal combustion engine according to any one of to 6 . The fitting hole (100) and the accommodation hole (113) having a circular cross-sectional shape are arranged such that the central axis (C1) of the accommodation hole (113) is greater than the central axis (C2) of the fitting hole (100). 8. The variable valve operating apparatus for an internal combustion engine according to claim 1, wherein the first rocker arm (71) is connected to each other while being offset toward the rocker shaft (78) side. . A pressure rod support hole (106) penetrating the support wall (85) so that the pressure rod (104) is slidably fitted to the support wall (85), and the rocker shaft (78). A rocker shaft support hole (105) to be inserted and supported is provided in parallel, and the pressing rod (104) can be inserted into the pressing rod support hole (106) from the side opposite to the first rocker arm (71). The variable valve operating apparatus for an internal combustion engine according to any one of claims 1 to 8 , wherein the variable valve operating apparatus is formed as follows. An actuator (107) having an output rod (111) for pressing the pressing rod (104) is provided, and a guide cylinder (112) for guiding the axial movement of the output rod (111) includes the cylinder head (27) and Projection perpendicular to the central axis (C3) of the pressing rod (104) so as to penetrate the valve chamber (67) formed between the head cover (28) coupled to the cylinder head (27). The variable valve operating apparatus for an internal combustion engine according to claim 9, wherein the variable valve operating apparatus is provided at a position overlapping the pressing rod (104) on a surface.

Images