JPS597717A - Defoaming method and device of working oil in hydraulic lash adjuster - Google Patents

Abstract

PURPOSE:To remove bubbles from working oil in a hydraulic lash adjuster without causing reduction of the pressure of the working oil, by constituting a defoaming chamber by at least two or more chambers of prescribed volume and removing the bubbles from the working oil throughout many stages. CONSTITUTION:A defoaming chamber is constituted by two or more chambers 102-104 of prescribed volume. The working oil is firstly allowed to flow through an inlet orifice 111, then to flow into the first volume chamber 102 and is subjected to the primary defoaming. Next, the oil is allowed to flow into the second volume chamber 103 through a bottom orifice 107 so as to be subjected to the secondary defoaming. After being allowed to flow successively through the volume chambers, the working oil is supplied to a hydraulic lash adjuster from the bottom part of the final volume chamber 104. In this way, under a condition that the pressure of the working oil is held as required for the hydraulic lash adjuster, defoaming of the working oil can be fully performed throughout many stages.

Description

[Detailed description of the invention]

The present invention provides a rocker arm A (D) of a valve train for an internal combustion engine.
The present invention relates to a method and device for defoaming hydraulic oil supplied to a lash adjuster used in a support portion. In a conventional overhead valve type valve train, the rocker arm is swingably supported by the cylinder head, providing clearance between the intake and exhaust valves and the rocker arm when the engine is in a closed state, and allowing the rocker arm to move freely when the engine is hot. Check the tip of the rocker arm for all intake and exhaust valves of each cylinder to prevent the intake and exhaust valves from closing incorrectly.

[Assembling and maintenance requires time and effort as the adjustment screw that has been screwed in must be turned as appropriate to adjust the clearance to an appropriate value.]
In addition, these clearances may differ due to changes over time, which may cause noise in the valve train. In order to omit this effort and time and to obtain a quiet engine without noise, a rat-un-your-adjuster was used.
If air bubbles are mixed into the hydraulic oil supplied to the lash adjuster, the air bubbles will be crushed by the action of the rocker arm, and the lash adjuster will not be held rigidly, resulting in poor opening of each valve, impact, etc. , a decrease in output and generation of noise were unavoidable. Furthermore, in order to defoam the air bubbles in the hydraulic fluid, it is necessary to increase the time during which the hydraulic fluid remains in the defoaming chamber and to lower the pressure within the defoaming chamber. However, since the diameter of the hydraulic oil passage and the diameter of the throttle part of the lash adjuster are constant, as the engine speeds up, the oil pressure supplied from the hydraulic pump to the reservoir chamber in the lash adjuster will drop significantly. As shown by the curve in FIG. 1, the lower limit of the hydraulic pressure supplied in the hydraulic pressure supply path increases as the rotational speed increases. In addition, as the speed of the engine increases, the operating time of the pressing force acting on the rocker arm support portion of the lash adjuster is shortened, so the amount of hydraulic oil discharged from the lash adjuster is reduced, and the amount of hydraulic oil discharged from the lash adjuster is reduced. As shown in the curve, the upper limit of the hydraulic pressure supplied in the hydraulic pressure supply path decreases as the rotational speed increases. Since the hydraulic pressure of the hydraulic oil supplied to the lash adjuster is required to be within a permissible range, the pressure in the defoaming chamber inserted in the hydraulic oil to the lash adjuster is significantly reduced. It is difficult to achieve sufficient defoaming. Moreover, in the past, the degassing chamber was provided at the cylinder head of the engine, which not only made it impossible to increase the size of the degassing chamber and lengthen the residence time of the hydraulic oil in the degassing chamber, but also allowed the degassing chamber to be installed in multiple stages. It was not possible to completely defoamer, and the intended purpose could not be achieved. The present invention relates to a method for defoaming hydraulic fluid in a hydraulic lash adjuster that overcomes these difficulties, and an improvement to its device. It is an object of the present invention to provide a defoaming method and a defoaming device that can sufficiently defoam a hydraulic lash adjuster working oil without significantly lowering the pressure. An embodiment of the present invention illustrated in FIGS. 2 to 10 will be described below. 1 is a four-cycle four-cylinder gasoline engine for motorcycles, and the cylinder head 2 of the engine 1 has two intake boats 3 and two exhaust ports 4 formed for each cylinder. Boat 3.4'fr: An intake valve 5 and an exhaust valve 6 are fitted so as to be openable and closable. The intake and exhaust valve 5.6 also includes the intake and exhaust boat 3.4.
Compression coil springs 7 are attached to the respective sides in such a direction that they can be closed at all times. Furthermore, the cam 8 is biased toward one side above the intake and exhaust valve 5.6.
is pivotally supported, and the cam 8 is connected to the crankshaft 9 by the cheno 1.
The cam 8 is connected via a sprocket 11 and a sprocket 11, and the cam 8 is rotationally driven in synchronization with the rotation of the crankshaft 9. A lash adjuster insertion cylinder 13 is formed on the opposite side from the opposite valve 5.6 and oriented upward and substantially parallel to the opposite valve 5.6.
Hydraulic lash adjusters 14 are fitted in and retractable, respectively. Moreover, one end of the rocker arm 12 is swingably supported by the tip spherical bearing portion 17 of the plunger 16 in the lash adjuster 14 , and the upper center surface of the rocker arm 12 contacts the cam 8 . The other end can come into contact with the top end of the intake/exhaust valve 5.6. However, as shown in FIG.
are the adjuster body 15 and the same adjuster body 15.
Inside (a plunger 16 slidably fitted, a retainer gap 18 fitted to the upper end of the adjuster body 15 to prevent the plunger 16 from protruding beyond a certain length, and a check ball case) 9. A plunger spring 20 biases the plunger 16 in both directions.
Then, the check ball case 1 is pressed so that the check ball 21 is brought into pressure contact with the lower end valve seat 16a of the plunger 16.
9 and a check ball spring 22 interposed between the check ball 21 and the check ball spring 22. In addition, in FIG. 5, the lash adjuster ? If the supply path 24 is provided beyond the communication opening 23 in this way, a small amount of dirt or metal powder interposed in the horizontal oil supply path 24 will be removed from the lash adjuster located near the closed end 24b. 14, so that malfunctions and the like will not occur. Further, as shown in FIGS. 2 and 3, in the cylinder head 2, a horizontal oil supply passage is oriented in the width direction of the vehicle body and is substantially parallel to the crankshaft 9 so as to pass through each lash adjuster insertion tube 13. 24 is
Inclined oil supply passages 25 are provided on the rear intake boat 3 side and the front exhaust boat 4 side, respectively, and are connected to the horizontal oil supply passage 24. A lash adjuster oil supply passage 26 is formed so as to be connected to the section. Furthermore, an air vent hole 27 is provided at the bottom of each of the lash adjuster insertion tubes 13, and the upper end opening path of the air vent hole 27 is connected to the communication opening 23 (the fifth (see figure). Furthermore, the upper end 5a of the inclined oil supply path 25 is connected to the oil communication M30 of the Camunyaft holder 29, and the oil tubes at both ends of the lash adjuster oil tube 33 are connected to the end opening 31 of the oil communication path 30. The joint 32 is removably fitted in an oil-tight manner via an O-ring 32a. Further, in the cylinder head 2, a cam journal 3 pivotally supports each cam 8 of the rear intake valve 5 and the front exhaust valve 6.
4 (see Fig. 3), a diagonal oil supply passage 35, a horizontal oil supply passage 36, and an oil communication passage 37 are bored in the cylinder head 2. A cam journal oil supply port 38 is formed in the oil communication passage 37, and oil tube joints 40 at both ends of a cam journal oil tube 41 (see FIG. 7) can be freely fitted and removed into the upper end opening 39 of the oil communication passage 37.
0a to ensure an oil-tight fit. Next, the oil supply system leading from the oil pump 43 (see FIG. 2) to the oil supply port 26 of the lash adjuster insertion tube 13 and the oil supply port 38 of the cam journal 34 will be described. As shown in FIGS. 2 and 4, an oil pump 43 is disposed in an oil pan 42 at the bottom of the engine 1.
A sprocket 45 integrated with the rotor 44 of the oil pump 43 is connected to a sprocket 47 of the crankshaft 9 via a chain 46, and the oil pump 43 is driven to rotate in proportion to the rotational speed of the engine 1. It has become. In addition, the suction port 43a of the oil pump 43 (a wire mesh oil filter 48 is attached thereto, and the discharge port 43b of the oil pump 43 is connected to an oil filter!-51 via a discharge pipe 49 and a communication passage 5o, and the oil filter 48 is connected to the oil filter 43a). is filtered in two stages by oil filters 48 and 51.Furthermore, the discharge passage 52 of the oil filter 51 is connected to the left end of the r11 direction oil passage 54 in the lower crankcase 53, and the oil The right end of the passage 54 is connected to a main journal 56 that supports the right end of the crankshaft 9 via a communication passage 55, and an oil passage 58 directed diagonally rearward and upward is connected to the main journal 56, which is connected to the upper crankcase 57 (J). Furthermore, one end of the cam journal oil supply vibro o is detachably connected to the outer end of the oil passage 58 by an oil pipe joint 59 (see Fig. 6). The other end of () is formed into a bifurcated vibro 1, and the bifurcated vibro 1 has an oil vibrator joint 62.
The cam journal oil supply port 3EH is removably connected to the cam journal oil supply port 3EH. The defoaming device 64 is attached to the upper right G unit of the upper crankcase 57, and inside the defoaming device casing 65 of the defoaming device 64 (see FIGS. 8, 9 and 1).
0), an upper degassing chamber 67 and a lower degassing chamber 68 are separated by a partition plate 66, and a lid member 69 is installed at the top end of the upper degassing chamber 67.
are fitted together, an orifice 70 is provided in the lid member 69, and an oil jet nozzle 7 is provided at the lower end of the orifice 70.
The nozzle 71 is curved so that one end of the nozzle 71 is connected to the other end of the nozzle 71, and the tip of the nozzle 71 is oriented in the horizontal tangential direction of the upper degassing chamber 67. and the cam journal oil supply vibro 0 (sixth
The tip of the defoaming device oil supply vibro 3 branched from the middle of the defoaming device (see figure) is connected to the orifice 70 of the defoaming device 64, and the cam journal oil supply vibro 0
A part of the oil flowing therein is ejected into the upper defoaming chamber 67 via the defoaming device oil supply vibro 3, the orifice 70, and the oil jet nozzle 71, and the nozzle 71 vertically moves the inside of the upper defoaming chamber 67. It flows in a spiral direction around the axis. Therefore, oil with high specific gravity flows along the inner wall side of the defoaming device casing 65, and oil with low specific gravity mixed with air bubbles flows along the inner wall side of the defoaming device casing 65.
It will be gathered at approximately the center of the area. Further, a communication hole 72 is provided in the outer peripheral part of the partition plate 66,
A guide plate 74 is integrally attached to the lower surface of the partition plate 66 so as to cover the lower side of the communication hole 72 and open lower 3 in the same direction as the tip opening of the oil jet nozzle 71.
The oil present at the bottom of 7 is connected to the communication hole 72 and the guide plate 74.
The oil is ejected into the lower degassing chamber 68 through the opening lower chamber 3 in the same direction as the oil flow direction in the upper degassing chamber 67, and has the same effect as the upper degassing chamber 67. Furthermore, the lash adjuster oil supply pipe 75 penetrates the lid member 69 and the partition plate 66 and is integrally fitted therein so that the lower end of the lash adjuster oil supply pipe 75 opens at the bottom of the lower defoaming chamber 68. The upper end of the oil supply pipe 75 (see FIG. 6) is formed into a two-pronged branch pipe 76, and the branch pipe 76 is removably connected to the lash adjuster oil supply passage 26 through an oil pipe joint 77. . Furthermore, the lower end of the upper vent oil discharge pipe 80 (see FIG. 8) is opened at the upper part of the upper degassing chamber 67.
The upper end of a vent oil discharge pipe 80 is integrally fitted into the vent oil passage 78 of the lid member 69 via an orifice 79, and the lower vent oil discharge pipe 80 is disposed so as to communicate the lower defoaming chamber 68 and the vent oil passage 78. A pipe 81 is provided, and an orifice 82 is interposed in the discharge pipe 81. Therefore, the vent pipe 83 (see Fig. 6 and Fig. 8)
One end of the vent pipe 83 is connected to the open end of the vent oil passage 78, and the other end of the vent pipe 83 is connected to the oil supply passage 86 (fourth
The oil containing many bubbles from the defoaming device 64 is passed from the vent oil discharge pipe 80.81 to the vent oil passage 78, the bed pipe 83 and the oil vibe joint 84 to generate AC power. The oil is supplied to a machine oil supply path 86. Further, the oil supply path 86 is connected to the shaft 87 of the alternator 85.
The hollow oil passage 88 is connected to the same hollow oil passage 88.
A branch passage 89 branches off in the radial direction from 8, and oil is supplied to the chain drive part 90 and one-way clutch 91 of the alternator 85, and is used to lubricate each bearing part and lubricate the alternator 85. To perform cooling. Furthermore, when the oil returns to the oil pan 42, it is sufficiently degassed under atmospheric pressure. Since the embodiments shown in FIGS. 2 to 10 are configured as described above, when the engine 1 is set to the operating state, the oil pump 43 is driven to rotate in proportion to the rotational speed of the engine 1. Ru. Then, the oil accumulated in the oil pan 42 becomes an oil fill)
After being filtered by the L'tor 48, it is sucked into the oil pump 43, pressurized within the same oil pump 43, and sent to the oil filter 51 via the discharge pipe 49 and the communication passage 50.
The oil is further filtered by the same oil filter 51. Further, the oil filtered by the oil filter 51 is sent to the main journal 56 via the discharge passage 52, the widthwise oil passage 54, and the communication passage 55, and the main journal 56 is lubricated with the oil. Furthermore, the oil that has passed through the main journal 56 is
Oil passage 58'? i: Flow, the oil flows into the cam journal oil supply vibro 0 through the oil vibe joint 59, and part of the oil in the vibro 0 flows into the cam journal oil through the two-pronged vibro 1 and the oil pipe joint 62. The supply port 38 is reached. Further, a part of the oil that has reached the cam journal oil supply port 38 is sent to the intake side horizontal oil supply passage 36 via the oil communication passage 37, and is supplied to the intake side cam journal 34 via the inclined oil supply passage 35. , the intake side cam journal 34 is lubricated. Furthermore, the remainder of the oil that has reached the cam journal oil supply port 38 flows upward in the oil communication passage 37, and passes through the upper end opening 39, the oil tube joint 40, and the cam journal oil tube 41 to the oil tube on the exhaust side. The joint 40 and the upper end opening 39 are reached. The oil that has reached the upper end opening 39 on the exhaust side is supplied to the exhaust side cam journal 34 via the oil communication path 37, the horizontal oil supply path 36, and the inclined oil supply path 35, and the exhaust side cam journal 34 is lubricated. Furthermore, the cam journal oil tube 41 is curved in a ■-shape so as to be adjacent to a group of intake and exhaust valves 5.6 which are divided into left and right halves by a cam chain chamber 92 formed at the center in the width direction of the engine 1. An oil injection port 93 is formed on the outer surface thereof toward the top of each intake/exhaust valve 5.6 and the rocker arm 12, and a cam journal oil tube 41' is formed.
? i: A part of the oil flowing past is jetted out from the oil injection port 93, and the oil is supplied to the sliding surfaces of the rocker arm 12, the intake/exhaust valve 5.6, and the cam 8. Moreover, a part of the oil flowing in the cam journal oil supply vibro 0 flows into the defoaming device oil supply vibro 3 and is directed tangentially into the upper defoaming chamber 67 from the oil jet nozzle 71 via the orifice 70. It is squirted. Then, the oil spouted into the upper degassing chamber 67 gradually descends while swirling in a spiral, and passes through the communication hole 72 to the guide plate 74.
The air flows into the lower degassing chamber 68 through the jet nozzle 71 in the same tangential direction as the jet nozzle 71 . While the oil flows spirally in the upper degassing chamber 67 and the lower degassing chamber 68 in this way, the oil containing many air bubbles floats up in each degassing chamber 67, 68, and the upper and lower vent oil discharge pipes 80 81, the oil flows into the generator oil supply path 86 via the vent oil passage 78, the vent vibe 83, and the oil pipe joint 84. The oil in the supply path 86 is then sent to the chain drive part 90 and one-way clutch 91 through the hollow oil passage 88 and branch passage 89 of the generator shaft 87, and the chain drive part 90 and one-way clutch 91 are lubricated. . On the other hand, the defoamed oil that flows spirally in the upper and lower degassing chambers 67 and 68 rises in the lash adjuster oil supply vibe 75 that is open at the bottom of the lower degassing chamber 68 and flows into the two prongs. Reached branch pi'f76, same two-pronged branch vibe 7
6, the oil flows into the inclined oil supply passage portion via the oil pipe joint 77 and the lash adjuster oil supply passage 26. A part of the oil that has flowed into the inclined oil supply passage 25 descends and passes through the intake side horizontal oil supply passage 2.1 to the lash adjuster 14 in the intake side lash adjuster insertion tube 13.
supplied to At the same time, the remainder of the oil that has flowed into the inclined oil supply path 5 rises to the oil communication path 30 of the camshaft holder 29, the upper end opening 31, the oil tube joint 32, the lash adjuster oil tube 33, and the exhaust side. Oil tube joint 32, end open II 3] - The oil is supplied to the lash adjuster 14 in the exhaust side lash adjuster insertion cylinder 13 via the oil communication passage 30, the exhaust side inclined oil supply passage 5 and the horizontal oil supply passage 24. In the embodiment described above, since the defoaming device 64 is disposed at the rear of the upper crankcase 57 separately from the cylinder head 2 of the engine 1, the casing 65 of the defoaming device 64 must be formed to have a sufficient size. Therefore, the oil can be defoamed for a long time without reducing the oil pressure of the oil supplied from the defoaming device 64 to the lash adjuster 14. Moreover, in the defoaming device 64, upper and lower defoaming chambers 67, 68
Since the air is defoamed in two stages, and the air is defoamed while spirally rotating from the oil jet nozzle 71 and the guide plate 744, the defoaming time is further extended and sufficient defoaming is possible. becomes. Furthermore, by arranging the defoaming device 64 away from the high-temperature cylinder head 2 and upper crankcase 57, it is possible to prevent the temperature of the oil supplied to the lash adjuster 14 from rising, thereby improving the durability of each part of the oil tappet. Furthermore, there is no need to enlarge the cylinder head 2 to form a defoaming chamber, which reduces the amount of expensive cylinder head material used and reduces weight. Furthermore, external piping 60 connects the oil passage 58 leading to the discharge side of the oil pump 43 and the lash adjuster oil supply passage 26 leading to the lash adjuster 14.
．． Since the defoaming device 64 is inserted in the cylinder 63.75, the defoaming device 64 can be installed at any desired position and number, eliminating the need for unnecessary waste material and hole machining, and reducing the cost of expensive cylinders. Coupled with the reduction in head material, it is possible to significantly reduce costs. In addition, the defoaming device 64 supplies oil containing a lot of bubbles from the upper and lower vent A oil discharge pipes 8 (1, 81) to the chain drive part 90 of the alternator 85 and the one-way clutch 91 via the vent vibe 83. Therefore, the oil containing a lot of bubbles can be effectively used for lubricating the engine 1. In addition, the oil containing a lot of bubbles in the defoaming device 64 can be used for the AC power generator which leaves the oil pan faster than the oil pan 42. It is sent to the chain drive section 90 and one-way clutch 91 of the machine 85, and the same section 90.
Since the oil is degassed while lubricating the oil pan 91, by the time the oil returns to the oil pan 42, it has been degassed sufficiently under atmospheric pressure. Furthermore, the oil that has lubricated the main journal 56 that pivotally supports the crankshaft 9 is supplied to the cam journal, lash adjuster 14, and lubricated parts 90 and 91 of the alternator 85, thereby increasing the amount of oil supplied to the oil pump 43. It is not necessary, and the load on the pump 43 can be reduced. In the defoaming device 64 of the embodiment shown in FIGS. 2 to 10, the defoaming casing 65 is vertically divided into two parts by a partition plate 66 to form an upper defoaming chamber 67 and a lower defoaming chamber 68. However, as shown in FIGS. 11 and 12, a defoaming device 100 in which the defoaming chambers are arranged horizontally may also be used. That is, the defoaming device 100 includes a cylindrical casing 101 whose central axis is oriented in the horizontal direction, and two partition plates 105 that divide the interior of the casing 101 into three defoaming chambers 102, 103, and 1044 in the central axis direction. .106 and the -th partition plate 105
The first partition plate 105 is installed in the second degassing chamber 103 so that the lower orifice 107 of the second degassing chamber 103 communicates with the upper part of the second degassing chamber 103.
The first communication member 109 and the first and second partition plates 106 attached to the
A second partition plate 106 is installed in the second degassing chamber 103 so that the upper orifice 108 and the lower part of the second degassing chamber 103 communicate with each other.
A second communication member 110 is provided at the bottom. In addition, there is an inlet orifice 11 at the top of the end face of the first degassing chamber 102.
1 is connected to the tip of a defoaming device oil supply vibrator 112. The lash adjuster oil supply vibrator 113 is passed through the cylindrical casing 101 so that the base end of the lash adjuster oil supply vibrator 113 opens at the bottom of the third degassing chamber 104.
is installed. Furthermore, the vent branch pipes 114, 115, 116 are attached to the upper part of each defoaming chamber 102, 103, 104 by penetrating through the cylindrical casing 101 so that the tips of the vent branch pipes 114, 115, 116 are open. Same vent branch pipe 1
The proximal ends of 14, 115, and 116 are connected to vent pipe 117. Note that orifices 118 are provided at the tips of the vent branch pipes 114, 115, and 116, respectively. Since the embodiment shown in FIGS. 11 and 12 is constructed as described above, the defoaming device oil supply vibrator 11
When the oil to be defoamed is supplied to the second degassing chamber 102, the oil flows into the first degassing chamber 102 from the first orifice 111, and the oil containing many air bubbles rises in the first degassing chamber 102. flows from the vent branch pipe 114 to the vent pipe 117,
The oil with few air bubbles passes through the first communication member 109 from the lower orifice 107 of the first partition plate 105 and flows into the second defoaming chamber 103.
Defoaming similar to that in the defoaming chamber 102 is performed. The oil removed in the second degassing chamber 103 with almost no air bubbles passes through the second communication part side 110 from the upper orifice 108 of the second partition plate 106 and enters the third degassing chamber 104. The oil that flows into the third degassing chamber 104 is defoamed in the same manner as described above, and the oil from which air bubbles have been sufficiently removed is sent to the lash adjuster oil supply vibrator 113, and is shown in FIGS. 2 to 10. The lash adjuster 14 is supplied in the same manner as in the illustrated embodiment. Further, the oil containing many bubbles in each degassing chamber 102, 103, 104 flows into the vent branch pipe 114, 115, 116 through the orifice 118 and joins in the vent pipe 117, as in the previous embodiment. 90.91 of the alternator 85 and lubricates the lubricated portion 90.91. Thus, in the embodiment shown in FIGS. 11 and 12, the oil is meandered up and down along the horizontal direction. Since it is shaped like a G-shape, the height of the entire defoaming device +00 can be lowered. In the present invention, in a method for defoaming hydraulic fluid for a hydraulic lash adjuster that supplies hydraulic fluid to a hydraulic ratunyu adjuster used in a valve mechanism of an engine through a defoaming chamber, the defoaming chamber is provided with at least a second grade The hydraulic oil is made up of an upper predetermined volume chamber, and after passing through the first throttle member, it flows into the first predetermined volume chamber to perform a second throttling, and then passes through the second throttle member. After that, the hydraulic oil is caused to flow into a second predetermined volume chamber to perform a second removal, and after passing through each predetermined volume in sequence, hydraulic oil is supplied to the hydraulic lash adjuster from the bottom of the final volume chamber. As a result, the hydraulic oil can be defoamed in multiple stages while maintaining the hydraulic oil pressure required by the hydraulic lash adjuster, thereby sufficiently defoaming the hydraulic oil. In a hydraulic lash adjuster hydraulic oil defoaming device that supplies hydraulic fluid to a hydraulic lash adjuster used in an engine valve mechanism through a defoaming chamber, the defoaming chamber is a chamber with a predetermined volume that is at least a second class higher. When the first throttle part side is attached to the entrance of the first predetermined volume chamber, the second constriction part side is also attached to the communication part between each predetermined volume chamber after the second predetermined volume chamber and its upstream predetermined volume chamber. A throttling member subsequent to the throttling member is attached to each, and a foam-containing hydraulic oil discharge throttling member is attached to the upper part of each of the predetermined volume chambers to discharge the hydraulic oil containing many air bubbles. Since the opening of the defoaming oil discharge member is arranged, the above-described method of defoaming the hydraulic lash adjuster hydraulic oil can be carried out reliably.

[Brief explanation of the drawing]

Figure 1 is a characteristic diagram illustrating the range in which the M pressure to be supplied to the lash adjuster must be in response to changes in engine speed, and Figure 2 is a diagram of the hydraulic lash adjuster according to the present invention. A partially vertical side view of a four-stroke, four-cylinder gasoline engine for motorcycles equipped with an embodiment of a hydraulic oil defoaming device, FIG. 3 is a vertical rear view thereof, and FIG.
A sectional view taken along the line ■-■ in the figure, FIG.
The figure is a perspective view of the oil tube of the same embodiment, FIG. 8 is a vertical cross-sectional side view of the defoaming device in the same embodiment, FIG. 10 is a longitudinal sectional front view cut in a direction perpendicular to the cross-sectional direction of FIG. 8, 111] is a longitudinal sectional side view of another embodiment of the present invention, and FIG. 12 is a rear view thereof. ■...Four-cycle four-cylinder gasoline engine for motorcycles, 2...Cylinder head, 3...Intake port, 4
...Exhaust port, 5...Intake valve, 6...Exhaust valve,
7...Compression coil spring, °8...Cam, 49
;...Crankshaft, 10...Chain, 11.
...Sprocket, 12...Rocker arm, 13.
... Lash adjuster insertion tube, 14... Ratsunyu adjuster, 15... Adjuster body, 16... Plunger, 17... Spherical tip bearing, 18... Retainer gap, 19... Check ball Case, addition...plunger spring, 21...check ball, 22...check ball spring, 23...
Communication opening, 24...Horizontal oil supply path, 24b...
Closed end, 25... Inclined oil supply passage, 26... Lash adjuster oil supply passage, 27... Air vent hole, end... Between upper ends [1, 29... Camshaft holder'-, 3 ( 'l...Oil communication passage, 31...Top opening, 32...Oil tube joint, 32a...
... 0 ring, 33... Lash adjuster oil tube, 34... Cam journal, 35... Inclined oil supply path, 36... Horizontal oil supply path, 37...
Oil communication passage, 38...cam journal oil supply D
, 39... Upper end opening, 40... Oil tube joint, 40a... O cylinder, 41... Cam journal oil tube, 42... Oil pan, 43...
・Oil pump, 44...Rotor, 45...Sprocket, 46...Che 2.47...Sprocket,
48...Oil filter, 49...Discharge pipe, 50
...Communication path, 51...Oil filter, 52...
・Discharge path, 53...lower crankcase, 54...
Width direction oil passage, 55... Communication passage, 56... Main journal, 57... Upper crankcase, 5
8... Oil passage, 59... Oil pipe joint, 60... Cam journal oil supply pipe, 61
...Two-pronged branch pipe, 62...Oil pipe joint, 63...Defoaming device oil supply pipe, 64...
・Defoaming device, 65...Defoaming device casing, 66...
- Partition plate, 67... Upper defoaming chamber 1.68... Upper defoaming chamber, 69... Lid member, 70... Orifice, 71
...Oil spout nozzle, 72...Communication hole, 73...
・Opening, 74...Guide plate, 75...Lash adjuster oil supply pipe, 76...Two-pronged branch pipe,
77...Oire〉shi'Piebujoisoto, 78...
Vent oil passage, 79... Orifice, 80...
Upper vent oil discharge pipe, 81... Lower vent oil discharge pipe, 82... Orifice, 83... Vent pipe, 84... Oil pipe joint, 85... Alternator, 86... Generator oil supply path, 87...
Alternator shaft, 88...Hollow oil passage, 89
... Branch passage, 90... Chain drive part, 91...
・One-way clutch, 92...Cam chain chamber, 9
3... Oil injection port, 100... Defoaming device, 101...
Cylindrical casing, 102...-th defoaming chamber, 1 (13
...Second defoaming chamber, 104...Third defoaming chamber, 105.
...No.-f1 Cutting plate, 106... Second partition plate, 107
... lower orifice, 108 ... upper orifice,
109... First communication member, 110... Second communication member, 111... Inlet orifice, 112... Defoaming device oil supply pipe, 113... Push: 1-Adjuster oil supply pipe, 114.115.116...Vent branch pipe, 117...Pen) pipe, 118...Orifice. Agent Patent attorney Ehara Requested amendment to the procedure August 23, 1980 Commissioner of the Japan Patent Office Kazuo Wakasugi 1 Indication of the case Relationship to the 1981 Patent Application No. 117015 case Patent applicant 4, Agent 6 By amendment Increased number of inventions None 7,
Target of amendment □ Figure 1 of the car in the original drawing of the application will be replaced with the attached drawing. Figure 11 Procedural Amendment Written October 6, 1980 Kazuo Wakasugi, Commissioner of the Japan Patent Office 1, Indication of the case 1982 Patent Application No. 117015 3, Person making the amendment Relationship with the case Patent applicant 4, Agent Address: 1-17-17 Toranomon, Minato-ku, Tokyo 5 Date of amendment order Voluntary 6 Number of inventions to be increased by amendment None 7, Specification subject to amendment (1) Page 5, No. 13 Correct it to "Intake boat 3" and "Intake boat 4" on the last line of page 7. (2) Correct "Exhaust boat 4" on page 5, line 14 and page 8, line 1 to "exhaust boat 3." (3) Page 5, line 15 and page 8, lines 17 to 1
Correct "Intake valve 5" on line 8 to "Intake valve 6". (4) Page 5, lines 15 to 16 and page 8, line 1
Correct "Exhaust valve 6" on line 8 to "Exhaust valve 5". (5) In the 5th and 6th lines of page 26, change "3...intake boat, 4...exhaust boat, 5-mount intake valve, 6...exhaust valve" to "3...exhaust boat," 4... Intake boat, 5
Corrected as ``mountain exhaust valve, 6-mountain intake valve''. 8. Supplementary 'E' Content Attachment 17) ii10

Claims (1)

[Scope of Claims] In a method for defoaming hydraulic fluid for a hydraulic lash adjuster that supplies hydraulic fluid to a hydraulic lash adjuster used in a valve train of one engine via a defoaming chamber, the defoaming chamber comprises at least The hydraulic oil is composed of a second-class predetermined volume chamber, and after passing through the first throttle member, it flows into the first predetermined volume chamber to perform primary defoaming, and then passes through the second throttle member. After that, the hydraulic oil flows into a second predetermined volume chamber to perform secondary defoaming, and after passing through each predetermined volume chamber in sequence, the hydraulic oil is supplied to the hydraulic lash adjuster from the bottom of the final volume chamber. A method for defoaming the hydraulic lash adjuster hydraulic fluid. 2. Hydraulic lash adjuster hydraulic oil defoaming device that supplies hydraulic oil via a defoaming chamber to a hydraulic lash adjuster used in the engine's valve mechanism (in this case, the defoaming chamber must be at least class 2). The first throttle member is attached to the entrance of the first predetermined volume chamber, and the communication portion between each predetermined volume chamber after the second predetermined volume chamber and its upstream predetermined volume chamber is The second throttle member and subsequent throttle parts are each attached, and a foam-containing hydraulic oil discharge throttle member is attached to the upper part of each predetermined volume chamber to discharge the hydraulic oil containing many bubbles, and the final predetermined volume chamber is A defoaming device for hydraulic lash adjuster hydraulic fluid, characterized in that an opening for a defoaming DLR discharge member is arranged at the bottom.