JP3548149B2 - Valve train for SOHC engine - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a valve train for an SOHC engine.
[0002]
[Prior art]
Such a valve operating device for an SOHC type engine is already known, for example, from Japanese Utility Model Laid-Open Publication No. 3-97507.
[0003]
[Problems to be solved by the invention]
The present invention relates to a SOHC engine, particularly to a hydraulic actuator that controls the valve timing or lift of an intake valve by hydraulically switching a connection state between a plurality of intake rocker arms driven by a plurality of intake cams provided on a valve operating camshaft. In a valve operating apparatus for an SOHC type engine provided with a cylinder, a control oil passage communicating with a first oil passage that supplies control oil pressure to an oil passage in an intake rocker shaft formed in an intake rocker shaft for operating a hydraulic actuator is provided by a cylinder. The head can be easily formed by using bolt holes for connecting the head to the cylinder block, and the cam journal portion can be lubricated by using the second oil passage that connects the control oil passage and the first oil passage. The purpose is to be.
[0004]
[Means for Solving the Problems]
In order to achieve the above object, the invention described in claim 1 is:The cylinder block comprises a pair of cylinder heads that expand into a V-shape with a space between them, and each cylinder head hasA valve operating apparatus for an SOHC type engine including a hydraulic actuator that controls the valve timing or lift of an intake valve by hydraulically switching a connection state between a plurality of intake rocker arms driven by a plurality of intake cams provided on a valve operating cam shaft. AndEach cylinder head is integrally formed with a cam bearing portion that supports a cam journal formed on the valve operating cam shaft, and has an intake rocker shaft on one side of the space side of the valve operating cam shaft and another side. The exhaust rocker shafts are fixed to each other, and the intake rocker shaft has an oil passage in the intake rocker shaft, and the exhaust rocker shaft has an oil passage in the exhaust rocker shaft. Shaft direction A control oil is formed at one end side of the bolt hole for connecting the cylinder head to the cylinder block, extends along the space side surface of each cylinder head, and is supplied with control oil from a hydraulic control valve. A second oil passage branching off from the control oil passage and having a downstream end opening to the cam journal portion; and a second oil passage branching from an intermediate portion of the second oil passage and located on the side of the cam bearing portion. And a control oil pressure is supplied from the first oil passage to an oil passage in the intake rocker shaft in order to operate the hydraulic actuator. A lubricating oil passage formed at an end side with a bolt hole for coupling the cylinder head to the cylinder block, extending along the side surface on the space side of each cylinder head, and supplied with lubricating oil from an oil pump. A third oil passage branching off from the lubricating oil passage and having a downstream end communicating with an annular groove formed in the cam journal portion, a fourth oil passage extending from the annular groove and communicating with an oil passage inside the exhaust rocker shaft, A fifth oil passage branching from an intermediate portion of the third oil passage and located on the side of the cam bearing portion and continuing to the oil passage in the intake rocker shaft is formed, and a hollow knock pin is provided at one axial end of each cylinder head. The oil passage in the intake rocker shaft is communicated with the first oil passage, and the communication between the oil passage in the intake rocker shaft and the fifth oil passage is blocked by a solid knock pin at the other end in the axial direction.It is characterized by the following.
[0005]
The invention described in claim 2 isIn addition to the features of the invention described in claim 1, the hydraulic control valve is disposed on one end side in the axial direction of each cylinder head.It is characterized by the following.
[0006]
According to a third aspect of the present invention, in addition to the features of the first aspect, the pair of cylinder heads have the same shape.
[0007]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described based on examples of the present invention shown in the accompanying drawings.
1 to 11 show an embodiment of the present invention. FIG. 1 is a side view of an engine on a timing belt side, FIG. 2 is a sectional view taken along line 2-2 of FIG. 1, and FIG. 4 is a sectional view taken along line 4-4 of FIG. 3, FIG. 5 is a sectional view taken along line 5-5 of FIG. 3, FIG. 6 is a sectional view taken along line 6-6 of FIG. 5, and FIG. 8 is a longitudinal sectional view of the engine on the timing belt side (a sectional view taken along the line 8-8 in FIG. 10), and FIG. 9 is a longitudinal sectional view of the engine on the transmission side (a sectional view along the line 9-9 in FIG. 10). FIG. 10 is a plan view of the cylinder head, and FIG. 11 is a hydraulic circuit diagram.
[0008]
First, in FIGS. 1 and 2, an engine body E is provided with a pair of cylinder heads 16 above a cylinder block 15 formed in a V-shape.₁, 16_TwoAn oil pan 17 is provided below the cylinder block 15 and both cylinder heads 16 are provided.₁, 16_TwoOn top of the head cover 18₁, 18_TwoAre combined.
[0009]
The cylinder block 15 includes a crankcase portion 15a and a pair of cylinder barrel portions 15b extending upward in a V-shape from the crankcase portion 15a.₁, 15b_TwoAnd both cylinder barrel portions 15b₁, 15b_TwoCylinder head 16₁, 16_TwoAre combined. Also, both cylinder barrel portions 15b₁, 15b_TwoAre provided with a plurality of cylinder bores 19 arranged in series, and pistons 20 are respectively slidably fitted in the cylinder bores 19. A plurality of journal bearings 21 are spaced from each other along the direction in which the cylinder bores 19 are arranged in the crankcase portion 15a, and bearing caps 22 fixed to the lower surfaces of the journal bearings 21; A crank shaft 23 is rotatably supported by the journal bearings 21. The crank pins 23 a of the crank shaft 23 are connected to the pistons 20 via connecting rods 24.
[0010]
An oil pump P driven by the crankshaft 23 is provided on one axial side of the crankshaft 23 and on the outer surface of one side wall of the cylinder block 15. In the oil pump P, an inner rotor 26 fixed to a crankshaft 23 and an outer rotor 27 meshing with the inner rotor 26 are mutually eccentric in a pump case 25 mounted on the outer surface of the side wall of the cylinder block 15. It is a trochoid pump rotatably housed and arranged at a position.
[0011]
A pump body 28 is fastened to the outer surface of one side wall of the cylinder block 15. The pump case 25 is composed of a pump case portion 29 provided on the back side of the pump body 28 and a case member 30 connected to the pump case portion 29. The pump body 28 is connected to the cylinder block 15 in a state where the pump body 28 is attached to the rear side of the case portion 29, that is, the cylinder block 15 side.
[0012]
An oil strainer 32 arranged in the oil pan 17 is connected to a suction port 31 provided in the pump case 25 via a suction pipe 33.
[0013]
At a position close to the outer surface of one side wall of the engine body E, the two cylinder heads 16 are set in parallel with the crankshaft 23.₁, 16_TwoValve camshaft 35 rotatably supported on each₁, 35_TwoIs disposed, and the winding transmission system T is fixed to an end of a crankshaft 23 protruding from a pump case 25 of the oil pump P. Pulley 36 and valve train camshaft 35₁, 35_TwoDriven pulleys 37 fixed to the ends of the₁, 37_TwoAnd the first driving pulley 36 and the driven pulley 37₁, 37_TwoThe first drive pulley 36 is fixed to the crankshaft 23 at a position where the pump case 25 is sandwiched between the pump case 25 and the outer surface of one side wall of the cylinder block 15.
In the winding transmission system T, the first driving pulley 36 and the driven pulley 37₁An idle pulley 39 is engaged with the outer peripheral side of the timing belt 38 between the first driving pulley 36 and the driven pulley 37 by the engagement of the idle pulley 39.₁The first driving pulley 36 and the driven pulley 37 are located on the inner side of the virtual system path R (see FIG. 1) when the connection is made directly.₁The traveling path of the timing belt 38 is deviated in a direction in which the amount of the timing belt 38 wound around the timing belt 38 is increased. The pump body 28 is provided with a boss 40 for rotatably supporting the idle pulley 39.
[0014]
Double driven pulley 37₁, 37_TwoThe timing belt 38 is wound around the water pump 41 therebetween. In addition, the driven pulley 37_TwoA rotary wheel 42 is engaged with the outer periphery of the timing belt 38 between the first drive pulley 36 and the rotary wheel 42. The rotary wheel 42 exerts a spring force in a direction of pressing the rotary wheel 42 against the timing belt 38. A tensioner 44 is formed together with a spring (not shown).
[0015]
Such a wrapping transmission system T is covered with a cover 45, and a cylinder head 16₁, 16_TwoAnd a rear cover 47 disposed between them.
[0016]
The crankshaft 23 further protrudes from the cover 45. A protruding end of the crankshaft 23 from the cover 45 has, for example, a second drive pulley 48 for driving a power steering hydraulic pump (not shown). A rotating wheel 50 having an AC generator (not shown) and a third drive pulley 49 for driving an air conditioner compressor is fixed.
[0017]
Next, an outline of the hydraulic circuit will be described based on FIG.
[0018]
The discharge port 51 of the oil pump P that pumps up the oil in the oil pan 17 via the suction port 31 is connected to a main gallery 53 via a filter / cooler unit 52, and the oil as the lubricating oil branches off from the main gallery 53. To lubricate the journal bearings 21 of the crankshaft 23 and the crankpins 23a. Further, on the transmission side of the engine body E, a pair of lubricating oil paths 71₁, 71_TwoIs branched into two, and one of the lubricating oil passages 71₁Is the exhaust rocker shaft 72 of the front bank₁Rocker shaft oil passage 73 formed inside₁Via the valve operating camshaft 35₁And the other lubricating oil passage 71_TwoIs the exhaust rocker shaft 72 of the rear bank_TwoRocker shaft oil passage 73 formed inside_TwoVia the valve operating camshaft 35_TwoTo lubricate.
[0019]
On the timing belt side of the engine body E, part of the oil that has passed through the filter / cooler unit 52 becomes control oil, and after the pressure is adjusted by the hydraulic control valve V operated by the solenoid valve 74, a pair of control oil paths 75₁, 75_TwoIt branches into two branches. One control oil passage 75₁From front bank intake rocker shaft 76₁Oil passage 77 inside the intake rocker shaft formed inside₁And three hydraulic actuators A for controlling the valve timing / lift of each intake valve of the front bank₁Activate ... The other control oil passage 75_TwoFrom rear bank intake rocker shaft 76_TwoOil passage 77 inside the intake rocker shaft formed inside_TwoIs supplied to three hydraulic actuators A for controlling the valve timing / lift of each intake valve of the rear bank._TwoActivate ...
[0020]
Next, the structure of the valve train will be described with reference to FIGS.
[0021]
Cylinder head 16_TwoIs provided with a pair of intake valves 81 and 81 and a pair of exhaust valves 82 and 82 corresponding to each cylinder. The two intake valves 81, 81 are respectively linked to and connected to a pair of drive intake rocker arms 83, 84, and the two drive intake rocker arms 83, 84 and a free intake rocker arm sandwiched between the drive intake rocker arms 83, 84. 85 is a fixed intake rocker shaft 76_TwoThe two drive rocker arms 83 and 84 are pivotally supported by the valve cam shaft 35._TwoThe free intake rocker arm 85 is oscillated by a pair of low-speed intake cams 86 provided in the valve cam shaft 35._TwoOscillatingly driven by a high-speed intake cam 87 provided in the hopper.
[0022]
Hydraulic actuator A_TwoA first switching pin 89 capable of fitting to the free intake rocker arm 85 so as to be slidably fitted to one drive intake rocker arm 83 and forming a hydraulic chamber 88 between the drive intake rocker arm 83 and One end face of the first switching pin 89 is in contact with the end face on the side opposite to the hydraulic chamber 88 so that the first switching pin 89 is slidably fitted to the free intake rocker arm 85 and can be fitted to the other drive intake rocker arm 84. A second switching pin 90, a regulating pin 91 which abuts on the other end surface of the second switching pin 90 and is slidably fitted to the other drive intake rocker arm 84, and a first switching via the second switching pin 90. A return spring 92 is provided between the drive intake rocker arm 84 and the restriction pin 91 by exerting a spring force for urging the restriction pin 91 in contact with the pin 89 toward the hydraulic chamber 88.
[0023]
On the other hand, the two exhaust valves 82, 82 are linked to and connected to a pair of exhaust rocker arms 93, 93, respectively._TwoAre swingably driven by a pair of exhaust cams 94, 94 provided in the motor.
[0024]
Cylinder head 16_TwoThe valve operating cam shaft 35_TwoThe four cam bearing portions 16a... Supporting the four cam journal portions 35a. As is clear from FIG. 5, the inner diameter of the cam journal 35a is formed larger than the maximum outer diameter of each of the cams 86, 86, 87, 94, 94, and the valve operating cam shaft 35_TwoCan be inserted into the cam bearing portions 16a so that the cam bearing portions 16a are not provided with a bearing cap. Therefore, the accuracy of the thrust regulation does not decrease due to the mounting error of the bearing cap.
[0025]
Thus, the hydraulic actuator A_TwoIn this case, when the hydraulic pressure in the hydraulic chamber 88 increases, the first switching pin 89 is fitted to the free intake rocker arm 85 and the second switching pin 90 is fitted to the other driving intake rocker arm 84, so that each rocker arm 83, 84 and 85 are connected. When the rocker arms 83, 84, 85 are connected in this manner, the two drive intake rocker arms 83, 84 swing together with the free intake rocker arm 85 that is swingably driven by the high-speed intake cam 87. The two intake valves 81, 81 are opened and closed at the timing and lift according to the high-speed intake cam 87. When the oil pressure in the hydraulic chamber 88 decreases, the first switching pin 89 returns to a position corresponding to the contact surface between the second switching pin 90 and the driving intake rocker arm 83 and the free intake rocker arm 84 by the spring force of the return spring 92, Since the second switching pin 90 returns to the position where the contact surface with the regulating pin 91 is made to correspond to the position between the free intake rocker arm 85 and the driving intake rocker arm 84, the connected state of the respective rocker arms 83, 84, 85 is released. Thus, in this disconnected state, the two drive intake rocker arms 83, 84 are oscillated by the low-speed intake cams 86, 86, and the intake valves 81, 81 are driven by the low-speed intake cams 86, 86 at the appropriate timing. It will be opened and closed by the lift.
[0026]
On the front bank side, similarly to the above-described rear bank side, the two intake valves 81, 81 are interlocked and connected to a pair of drive intake rocker arms 83, 84 that are swingably driven by low-speed cams 86, 86, respectively. A fixed intake rocker shaft 76 includes a two-drive intake rocker arm 83, 84 and a free intake rocker arm 85 sandwiched between the drive intake rocker arms 83, 84 and oscillated by a high-speed intake cam 87.₁It is supported to be able to swing. Thus, the hydraulic actuators A provided on the rocker arms 83, 84, 85₁Is the hydraulic actuator A_TwoIt has the same configuration as
[0027]
3, 4 and 10, the cylinder head 16₁, 16_TwoValve camshaft 35₁, 35_TwoAre provided on one side of each of the five cam bearing portions 16a... Provided to support the intake rocker shaft 76.₁, 76_TwoThe four intake rocker shaft fixing portions 16b, 16c, 16d, and 16e for supporting the shaft are integrally provided continuously. Intake rocker shaft 76₁, 76_TwoAre fixed to two axially outer intake rocker shaft fixing portions 16b and 16e by one bolt 95, respectively, and two axially inner two intake rocker shaft fixing portions 16c and 16d are respectively fixed to two intake rocker shaft fixing portions 16c and 16d. It is fixed with bolts 95,95.
[0028]
The exhaust rocker shaft 72 is provided on the other side of the cam bearings 16a.₁72_TwoThe four exhaust rocker shaft fixing portions 16f, 16g, 16h, 16i for supporting the shaft are integrally provided in series. Exhaust rocker shaft 72₁, 72_TwoIs fixed to each of the exhaust rocker shaft fixing portions 16f, 16g, 16h, 16i with one bolt 96, respectively.
[0029]
As described above, the intake rocker shaft 76₁, 76_TwoAre fixed to the intake rocker shaft fixing portions 16b to 16e with bolts 95, so that the support rigidity can be increased.₁, 72_TwoAre fixed by the bolts 96 of the exhaust rocker shaft fixing portions 16f to 16i, so that the support rigidity can be increased.
[0030]
As shown in FIG. 10, the intake rocker shaft fixing portions 16b to 16e are integrally formed with intake rocker arm positioning surfaces 16j at the axial ends thereof. The drive rocker arms 83 are connected to the intake rocker arm positioning surfaces 16j. , 84, that is, the side not in contact with the free intake rocker arms 85, slidably abuts. As described above, the side surfaces of the drive intake rocker arms 83, 84,... Are guided by the rocker arm positioning surfaces 16j, which are formed integrally with the intake rocker shaft fixing portions 16b to 16e, so that the drive intake rocker arms 83, 84,. The rocker arm 85 can be easily and precisely positioned in the thrust direction without using a special positioning member such as a collar. As a result, the hydraulic actuator A which controls connection and disconnection between the drive intake rocker arms 83.₁…, A_TwoThe operation of ... can be performed smoothly.
[0031]
Exhaust rocker arm positioning surfaces 16k are integrally provided at the axial ends of the exhaust rocker shaft fixing portions 16f to 16i. The pair of two exhaust rocker arms 93, 93 are urged in the direction away from each other by springs 97, and the side not in contact with the springs 97 is slidable on the exhaust rocker arm positioning surface 16k. Abut. In this way, by guiding the side surfaces of the exhaust rocker arms 93 to the exhaust rocker arm positioning surfaces 16k formed integrally with the exhaust rocker shaft fixing portions 16f to 16i, the exhaust rocker arms 93 can be easily positioned in the thrust direction. Can be.
[0032]
Next, the intake rocker shaft 76₁, 76_TwoVia hydraulic actuator A₁…, A_Two... and the exhaust rocker shaft 72₁, 72₁Through the valve gear camshaft 35₁, 35_TwoThe structure of the lubricating oil passage leading to will be described mainly with reference to FIGS.
[0033]
A main gallery 53 to which oil from the oil pump P is supplied as lubricating oil is formed along the axial direction of the crankshaft 23 in the vicinity of a branch portion of the front bank and the rear bank of the engine body E. On the timing belt side of the engine body E, the control oil supplied from the hydraulic control valve V is supplied to the control oil passage 75 on the front bank side.₁And the control oil passage 75 on the rear bank side_TwoAnd branch into two. Control oil passage 75₁, 75_TwoIs the cylinder barrel portion 15b of the cylinder block 15.₁, 15b_TwoControl oil passage 75a drilled in₁, 75a_TwoAnd the cylinder head 16₁, 16_TwoTo the cylinder barrel 15b₁, 15b_TwoControl oil passage 75b formed along the outer periphery of bolt 54.₁, 75b_TwoIt is composed of
[0034]
Second control oil passage 75b₁, 75b_TwoOil passage 55 branched at right angles from the₁, 55_TwoDownstream end of the valve cam shaft 35₁, 35_Two(In the front bank, the second cam journal portion 35a from the timing belt side in the front bank, and in the rear bank, the cam journal portion 35a closest to the timing belt side) to lubricate the cam journal portions 35a, 35a.
[0035]
In the front bank, the intake rocker shaft 76₁Is the hollow knock pin 57₁And is positioned at the intake rocker shaft fixing portion 16e by the second oil passage 55.₁Oil passage 56 branching at right angles from the middle of₁The downstream end of the hollow knock pin 57₁Through the intake rocker shaft oil passage 77₁Communicate with In the rear bank, the intake rocker shaft 76_TwoIs the hollow knock pin 57_TwoAnd is positioned in the intake rocker shaft fixing portion 16b by the second oil passage 55._TwoOil passage 56 branching at right angles from the middle of_TwoThe downstream end of the hollow knock pin 57_TwoThrough the intake rocker shaft oil passage 77_TwoCommunicate with Intake rocker shaft 76₁, 76_TwoDownstream end (end on the mission side side) of a solid knock pin 62 described later.₁, 62_TwoIs closed by
[0036]
Thus, the control oil from the hydraulic control valve V is supplied to the control oil passage 71.₁, 71_Two, The second oil passage 55₁, 55_TwoAnd the first oil passage 56₁, 56_TwoThrough the intake rocker shaft oil passage 77₁, 77_TwoSupplied to the hydraulic actuator A₁…, A_TwoActivate ...
[0037]
On the other hand, on the mission side of the engine body E, a lubricating oil passage 71 from the downstream end of the main gallery 53 to the front bank side.₁And the lubricating oil passage 71 on the rear bank side_TwoAnd bifurcate. Lubricating oil passage 71₁, 71_TwoIs the cylinder barrel portion 15b of the cylinder block 15.₁, 15b_TwoFirst lubricating oil passage 71a₁, 71a_TwoAnd the cylinder head 16₁, 16_TwoTo the cylinder barrel 15b₁, 15b_TwoLubricating oil passage 71b formed along the outer periphery of bolts 54.₁, 71b_TwoIt is composed of
[0038]
Second lubricating oil passage 71b₁, 71b_TwoThird oil passage 58 branched at right angles from₁, 58_TwoDownstream end of the valve cam shaft 35₁, 35_Two(In the front bank, the cam journal portion 35a closest to the transmission side in the front bank, and in the rear bank, the second cam journal portion 35a from the transmission side) communicates with the annular grooves 35b, 35b. Lubricate 35a, 35a. Further, a fourth oil passage 59 extending from the annular grooves 35b, 35b.₁, 59_TwoAre the oil passages 73 in the exhaust rocker shaft, respectively.₁, 73_TwoCommunicate with
[0039]
In the front bank, the intake rocker shaft 76₁Is the solid knock pin 62₁Is positioned at the intake rocker shaft fixing portion 16b by the third oil passage 58.₁Fifth oil passage 60 branching at right angles from the middle of the oil passage₁Downstream end of the solid knock pin 62₁Oil passage 77 in the intake rocker shaft₁Communication to the is blocked. In the rear bank, the intake rocker shaft 76_TwoIs the solid knock pin 62_TwoIs positioned at the intake rocker shaft fixing portion 16e by the third oil passage 58._TwoFifth oil passage 60 branching at right angles from the middle of the oil passage_TwoDownstream end of the solid knock pin 62_TwoOil passage 77 in the intake rocker shaft_TwoCommunication to the is blocked.
[0040]
Thus, the exhaust rocker shaft oil passage 73₁, 73_TwoSupplied to the exhaust rocker shaft oil passage 73₁, 73_TwoSixth oil passages 61 branching from each other₁…, 61_Two… Through the valve gear camshaft 35₁, 35_TwoAre lubricated. As is clear from FIG. 11, the valve cam shaft 35 of the rear bank is provided._TwoThe lubrication conditions of the cam journal 35a on the side of the timing belt closest to the timing belt 38 become severe due to the load received from the timing belt 38, but the cam journal 35a is connected to the oil passage 73 in the exhaust rocker shaft._TwoTo the sixth oilway 61_TwoThrough the control oil passage 75_TwoFrom the second oil passage 55_TwoAnd there is no risk of causing lubrication failure.
[0041]
As is apparent from FIGS.₁, 57_TwoAnd solid knock pin 62₁, 62_TwoThe first oil passage 56 in which₁, 56_TwoAnd the fifth oil passage 60₁, 60_TwoAre formed on the sides of the cam bearing portions 16a, so that the bolts 95 that are displaced in the axial direction from the cam bearing portions 16a₁, 56_Two, 60₁, 60_TwoWith the oil passage 56₁, 56_Two, 60₁, 60_TwoAnd the strength of the cam bearing portions 16a can be prevented from being reduced.
[0042]
As is apparent from FIG. 10, the cylinder head 16 of the front bank is provided.₁And rear bank cylinder head 16_TwoHave the same shape, and the cylinder head 16 of the front bank is used.₁Is rotated 180 ° about the point O, the cylinder head 16 of the rear bank is rotated._TwoOverlap. And the cylinder head 16 of the front bank₁Hollow knock pin 57₁Corresponds to the position where the cylinder head 16 of the rear bank is fitted._TwoHas a solid knock pin 62_TwoAre fitted. And the cylinder head 16 of the front bank₁                                Solid knock pin 62₁Corresponds to the position where the cylinder head 16 of the rear bank is fitted._TwoHas a hollow knock pin 57_TwoAre fitted. As a result, members having the same shape can be transferred to the cylinder heads 16 of the front and rear banks.₁, 16_TwoIt is possible to use it for
[0043]
As described above, the oil pump P and the hydraulic control valve V are arranged on the timing belt side of the engine body E, and the intake rocker shafts 76 of the front bank and the rear bank are arranged from the same timing belt side.₁, 76_Two, The control oil is supplied to the intake rocker shaft 76 from the hydraulic control valve V.₁, 76_Two, The length of the oil path leading to the control oil pressure can be reduced to a minimum, thereby preventing a decrease in control oil pressure.
[0044]
As shown in FIGS. 3, 4 and 7, on the transmission side of the rear bank, a valve train camshaft 35 is provided._TwoDistributor 99 connected to the end of the shaft through an Oldham coupling 98_TwoIs provided. Oil passage 77 in the intake rocker shaft_TwoA leak hole 76a that opens downward at the downstream end of the_TwoAre formed, and the leak holes 76a are formed._TwoThe hydraulic oil leaked from the cylinder head 16_TwoOil hole 15c formed in_TwoThen, the Oldham coupling 98 is lubricated through an oil hole 100a formed in the distributor support member 100, and is discharged through an oil hole 100b formed in the distributor support member 100. Further, the distributor support member 100 is provided with the valve operating camshaft 35._TwoAbuts against the flange portion at the shaft end of the valve operating cam shaft 35._TwoAlso regulates thrust.
[0045]
Thus, the oil passage 77 in the intake rocker shaft is provided._TwoDistributor 99 with hydraulic oil leaking from_TwoBy lubricating the Oldham's joint 98, it is possible to prevent the Oldham's joint 98 from hitting or wearing. Moreover, the leak hole 76a_TwoThe amount of hydraulic oil leaked from the hydraulic motor increases during high rotation, so that it is possible to more effectively prevent the generation of hammering noise and wear at the Oldham coupling 98. The leak hole 76a_TwoHydraulic oil from the hydraulic actuator A_Two, The switching responsiveness at the time of high rotation of the valve timing / lift at the time of low rotation can be improved.
[0046]
Although the embodiments of the present invention have been described in detail, various design changes can be made in the present invention without departing from the gist thereof.
[0047]
【The invention's effect】
As aboveBookAccording to the present invention, the cylinder head is connected to the cylinder block, and the control oil passage communicating with the first oil passage that supplies control oil pressure to the intake rocker shaft oil passage formed in the intake rocker shaft to operate the hydraulic actuator is connected to the cylinder block. Not only can it be easily formed using the bolt holes, but also the cam journal portion can be lubricated using the second oil passage that connects the control oil passage and the first oil passage.
[0048]
AlsoIn particularAccording to the invention of claim 2,A hydraulic control valve for supplying control oil to the control oil passage is disposed at one axial end of the pair of cylinder heads expanding in a V-shape. Control oil can be supplied to the engine and not only one hydraulic control valve is required, but also the oil path from the hydraulic control valve to the intake rocker shaft is reduced to a minimum to reduce the control oil pressure. Can be avoided.
[0049]
In particular, according to the invention of claim 3,By simply selecting the shape of the knock pin and the shape of the cam journal portion, it is possible to form the necessary oil passage for each cylinder head, thereby enabling the same member to be shared by a pair of cylinder heads of a V-type engine. Become.
[Brief description of the drawings]
FIG. 1 is a side view of an engine on a timing belt side.
FIG. 2 is a sectional view taken along line 2-2 of FIG.
FIG. 3 is a plan view of a valve train of the rear bank.
FIG. 4 is a sectional view taken along line 4-4 in FIG. 3;
5 is a sectional view taken along line 5-5 in FIG. 3;
FIG. 6 is a sectional view taken along line 6-6 in FIG. 5;
FIG. 7 is a sectional view taken along line 7-7 of FIG. 4;
8 is a longitudinal sectional view of the engine on the timing belt side (a sectional view taken along line 8-8 in FIG. 10).
9 is a longitudinal sectional view of the transmission side of the engine (a sectional view taken along line 9-9 in FIG. 10).
FIG. 10 is a plan view of a cylinder head.
FIG. 11 is a hydraulic circuit diagram.
[Explanation of symbols]
A₁, A_Two            Hydraulic actuator
P oil pump
V hydraulic control valve
15 Cylinder block
16₁, 16_Two        cylinder head
16a Cam bearing
35₁, 35_Two        Valve camshaft
35a Cam Journal
35b annular groove
55₁, 55_Two        Oilway (second oilway)
56₁, 56_Two        Oilway (first oilway)
57₁, 57_Two        Hollow dowel pin
62₁, 62_Two        Solid knock pin
72₁, 72_Two        Exhaust rocker shaft
73₁, 73_Two        Exhaust rocker shaft oil passage
75₁, 75_Two        Control oil passage
76₁, 76_Two        Intake rocker shaft
77₁, 77_Two        Oil passage in intake rocker shaft
81 Intake valve
83, 84, 85 Intake rocker arm
86,87 intake cam
95 volts

Claims (3)

A cylinder block (15) is provided with a pair of cylinder heads (16 ₁ , 16 ₂ ) which open in a V-shape with a space between each other, and each of the cylinder heads (16 ₁ , 16 ₂ ) has a valve train. The intake valve (81) is hydraulically switched between a plurality of intake rocker arms (83, 84, 85) driven by a plurality of intake cams (86, 87) provided on the cam shafts (35 ₁ , 35 ₂ ). A valve operating apparatus for an SOHC engine equipped with hydraulic actuators (A ₁ , A ₂ ) for controlling valve timing or lift of
Each cylinder head (16 ₁ , 16 ₂ ) is integrally formed with a cam bearing (16a) for supporting a cam journal (35a) formed on a valve operating cam shaft (35 ₂ ). axis (35 _1, 35 ₂₎ the intake rocker shaft on one side of the space side of the (76 _1, 76 _2), also an exhaust rocker shaft (72 _1, 72 ₂₎ are fixed respectively to the other side,
An intake rocker shaft (76 _1, 76 ₂₎ intake rocker shaft oil passage is in the (77 _1, 77 _2), also the exhaust rocker shaft (72 _1, 72 ₂₎ oil passage exhaust rocker shaft is in ( 73 ₁ , 73 ₂ ) respectively,
One end of each cylinder head (16 ₁ , 16 ₂ ) in the axial direction of the valve operating cam shaft (35 ₁ , 35 ₂ ) is connected to the cylinder head (16 ₁ , 16 ₂ ) with the cylinder block (15). Control oil passages (75 ₁ , 75 ₁ ) which are formed in the bolt holes of the respective cylinder heads (16 ₁ , 16 ₂ ) and extend along the side surface on the space side, and are supplied with control oil from a hydraulic control valve (V) . 75 ₂ ), a second oil passage (55 ₁ , 55 ₂ ) branched from the control oil passage (75 ₁ , 75 ₂ ) and having a downstream end opening to the cam journal portion (35 a); (55 ₁ , 55 ₂ ) and a first oil passage (56 ₁ , 56 ₂ ) branched from the intermediate portion and located on the side of the cam bearing portion (16a). from (56 _1, 56 _2), the intake to actuate the hydraulic actuator (a _1, a ₂₎ The control hydraulic pressure to be supplied to the Tsu mosquito shaft oil passage (77 _1, 77 _2),
A cylinder head (16 ₁ , 16 ₂ ) is connected to a cylinder block (15) at the other axial end of each valve head cam shaft (35 ₁ , 35 ₂ ) of each cylinder head (16 ₁ , 16 ₂ ). Lubricating oil passages (71 ₁ , 71 ₁ ) , which are formed in bolt holes for extending along the side surfaces on the space side of the cylinder heads (16 ₁ , 16 ₂ ) and which are supplied with lubricating oil from an oil pump (P) . 71 ₂ ) and third oil passages (58 ₁ , 58 ) branched off from the lubricating oil passages (71 ₁ , 71 ₂ ) and having downstream ends communicating with annular grooves (35 b) formed in the cam journal portion (35 a). ₂ ), a fourth oil passage (59 ₁ , 59 ₂ ) extending from the annular groove (35b, 35b) and communicating with the oil passage (73 ₁ , 73 ₂ ) in the exhaust rocker shaft, and a third oil passage (58 _1). , position on the side of the cam bearing portions (16a) with branches from the middle portion of 58 ₂₎ To No. 5 oil passage (60 _1, 60 ₂₎ and is formed continuous with the intake rocker shaft oil passage (77 _1, 77 _2),
Said axial end hollow at the side knock pin (57 _1, 57 ₂₎ the intake rocker shaft oil passage at (77 _1, 77 ₂₎ the first oil passage of the cylinder head (16 _1, 16 ₂₎ (56 ₁ , 56 ₂₎ is communicated, and the axis actual knock pin (62 ₁ in the direction end side, 62 an intake rocker shaft oil passage ₂₎ (77 _1, 77 ₂₎ and the fifth oil passage thereof (60 _1, characterized in that it cuts off the communication between the 60 _2), the valve operating device of SOHC type engine. A cylinder block (15) is provided with a pair of cylinder heads (16 ₁ , 16 ₂ ) which open in a V-shape with a space between each other, and each of the cylinder heads (16 ₁ , 16 ₂ ) has a valve train. The intake valve (81) is hydraulically switched between a plurality of intake rocker arms (83, 84, 85) driven by a plurality of intake cams (86, 87) provided on the cam shafts (35 ₁ , 35 ₂ ). A valve operating apparatus for an SOHC engine equipped with hydraulic actuators (A ₁ , A ₂ ) for controlling valve timing or lift of
Each cylinder head (16 ₁ , 16 ₂ ) is integrally formed with a cam bearing (16a) for supporting a cam journal (35a) formed on a valve operating cam shaft (35 ₂ ). axis (35 _1, 35 ₂₎ the intake rocker shaft on one side of the space side of the (76 _1, 76 _2), also an exhaust rocker shaft (72 _1, 72 ₂₎ are fixed respectively to the other side,
An intake rocker shaft (76 _1, 76 ₂₎ intake rocker shaft oil passage is in the (77 _1, 77 _2), also the exhaust rocker shaft (72 _1, 72 ₂₎ oil passage exhaust rocker shaft is in ( 73 ₁ , 73 ₂ ) respectively,
One end of each cylinder head (16 ₁ , 16 ₂ ) in the axial direction of the valve operating cam shaft (35 ₁ , 35 ₂ ) is connected to the cylinder head (16 ₁ , 16 ₂ ) with the cylinder block (15). Control oil passages (75 ₁ , 75 ₁ ) which are formed in the bolt holes of the respective cylinder heads (16 ₁ , 16 ₂ ) and extend along the side surface on the space side, and are supplied with control oil from a hydraulic control valve (V) . 75 ₂ ), a second oil passage (55 ₁ , 55 ₂ ) branched from the control oil passage (75 ₁ , 75 ₂ ) and having a downstream end opening to the cam journal portion (35 a); (55 ₁ , 55 ₂ ) and a first oil passage (56 ₁ , 56 ₂ ) branched from the intermediate portion and located on the side of the cam bearing portion (16a). from (56 _1, 56 _2), the intake to actuate the hydraulic actuator (a _1, a ₂₎ The control hydraulic pressure to be supplied to the Tsu mosquito shaft oil passage (77 _1, 77 _2),
A cylinder head (16 ₁ , 16 ₂ ) is connected to a cylinder block (15) at the other axial end of each valve head cam shaft (35 ₁ , 35 ₂ ) of each cylinder head (16 ₁ , 16 ₂ ). Lubricating oil passages (71 ₁ , 71 ₁ ) , which are formed in bolt holes for extending along the side surfaces on the space side of the cylinder heads (16 ₁ , 16 ₂ ) and which are supplied with lubricating oil from an oil pump (P) . 71 ₂ ) and third oil passages (58 ₁ , 58 ) branched off from the lubricating oil passages (71 ₁ , 71 ₂ ) and having downstream ends communicating with annular grooves (35 b) formed in the cam journal portion (35 a). ₂ ), a fourth oil passage (59 ₁ , 59 ₂ ) extending from the annular groove (35b, 35b) and communicating with the oil passage (73 ₁ , 73 ₂ ) in the exhaust rocker shaft, and a third oil passage (58 _1). , position on the side of the cam bearing portions (16a) with branches from the middle portion of 58 ₂₎ To No. 5 oil passage (60 _1, 60 ₂₎ and is formed continuous with the intake rocker shaft oil passage (77 _1, 77 _2),
Said axial end hollow at the side knock pin (57 _1, 57 ₂₎ the intake rocker shaft oil passage at (77 _1, 77 ₂₎ the first oil passage of the cylinder head (16 _1, 16 ₂₎ (56 ₁ , 56 ₂₎ is communicated, and the axis actual knock pin (62 ₁ in the direction end side, 62 an intake rocker shaft oil passage ₂₎ (77 _1, 77 ₂₎ and the fifth oil passage thereof (60 _1, 60 ₂ )
The valve apparatus for an SOHC engine, wherein the hydraulic control valve (V) is disposed on one end side in the axial direction of each cylinder head (16 ₁ , 16 ₂ ) . From the cylinder block (15), a pair of cylinder heads (16 ₁ , 16 _Two ), And each cylinder head (16) ₁ , 16 _Two ), The valve operating camshaft (35) ₁ , 35 _Two ), The connection state between the plurality of intake rocker arms (83, 84, 85) driven by the plurality of intake cams (86, 87) is hydraulically switched to control the valve timing or lift of the intake valve (81). Hydraulic actuator (A ₁ , A _Two A valve train of an SOHC type engine comprising:
Each cylinder head (16 ₁ , 16 _Two ) Includes a valve operating cam shaft (35). _Two ), The cam bearing portion (16a) for supporting the cam journal portion (35a) is integrally formed, and the valve operating camshaft (35) is integrally formed. ₁ , 35 _Two ) On one side of the space side. ₁ , 76 _Two ) And the exhaust rocker shaft (72 ₁ , 72 _Two )
Its intake rocker shaft (76 ₁ , 76 _Two ) Has an intake rocker shaft oil passage (77). ₁ , 77 _Two ) And the exhaust rocker shaft (72 ₁ , 72 _Two ) Have an oil passage in the exhaust rocker shaft (73). ₁ , 73 _Two ) To form
Each cylinder head (16 ₁ , 16 _Two ), The valve cam shaft (35) ₁ , 35 _Two ), The cylinder head (16) ₁ , 16 _Two ) Is formed in a bolt hole for connecting the cylinder head (16) to the cylinder block (15). ₁ , 16 _Two ) Extends along the side surface on the space side and is supplied with control oil from a hydraulic control valve (V). ₁ , 75 _Two ) And the control oil passage (75 ₁ , 75 _Two ), The second oil passage (55) having a downstream end opening to the cam journal portion (35a). ₁ , 55 _Two ) And the second oil passage (55 ₁ , 55 _Two ) Middle The first oil passage (56) branched from the portion and located on the side of the cam bearing portion (16a). ₁ , 56 _Two ) And the first oil passage (56) ₁ , 56 _Two ) To the hydraulic actuator (A ₁ , A _Two ) To operate the oil passage in the intake rocker shaft (77). ₁ , 77 _Two ) To supply the control oil pressure,
Each cylinder head (16 ₁ , 16 _Two ), The valve cam shaft (35) ₁ , 35 _Two ), The cylinder head (16) ₁ , 16 _Two ) Is formed in a bolt hole for connecting the cylinder head (16) to the cylinder block (15). ₁ , 16 _Two ) Extends along the side surface on the space side and is supplied with lubricating oil from an oil pump (P). ₁ , 71 _Two ) And the lubricating oil passage (71 ₁ , 71 _Two ), The downstream end of which communicates with an annular groove (35b) formed in the cam journal portion (35a). ₁ , 58 _Two ) And an oil passage (73) extending from the annular groove (35b, 35b) in the exhaust rocker shaft. ₁ , 73 _Two ), The fourth oil passage (59) ₁ , 59 _Two ) And the third oil passage (58 ₁ , 58 _Two ), And is located on the side of the cam bearing portion (16a) and is located at the side of the cam bearing portion (16a). ₁ , 77 _Two 5) oil passage (60 ₁ , 60 _Two ) And form
Each cylinder head (16 ₁ , 16 _Two ) At one end in the axial direction. ₁ , 57 _Two ) At the oil passage in the intake rocker shaft (77). ₁ , 77 _Two ) To the first oil passage (56 ₁ , 56 _Two ), And at the other end in the axial direction, a solid knock pin (62) ₁ , 62 _Two ) At the intake rocker shaft oil passage (77 ₁ , 77 _Two ) And the fifth oilway (60 ₁ , 60 _Two ),
The pair of cylinder heads (16 ₁ , 16 _Two ) Are valve gears for an SOHC type engine, which have the same shape.

Images