JPH051804U - Engine lubricator - Google Patents

Abstract

(57) [Abstract] [Purpose] In a device provided with a variable valve timing mechanism and a hydraulic lash adjuster, the responsiveness of the operation of the variable valve timing mechanism is improved while keeping the function of the hydraulic lash adjuster in good condition. [Structure] The operation of the variable valve timing mechanism 10 is stopped in a low load and low rotation region, and when the variable valve timing mechanism 10 is activated, the oil passage for the hydraulic lash adjuster 11 is throttled to force the variable valve timing mechanism. A means for supplying oil is provided.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

  The present invention provides a hydraulic lash adjuster together with a variable valve timing mechanism in the valve mechanism. The present invention relates to an engine lubrication device including a caster.

[0002]

[Prior art]

  Conventionally, for example, as disclosed in Japanese Utility Model Laid-Open No. 62-57711, an engine Valve mechanism, the camshaft drive mechanism that opens and closes intake and exhaust valves Equipped with an imaging variable mechanism to change the rotation phase of the crankshaft and camshaft. Furthermore, the one that changed the valve timing of the intake valve or the exhaust valve is Are known. The variable valve timing mechanism shown in this publication is hydraulically actuated. The operation control is performed by a camshaft equipped with a variable valve timing mechanism. An electromagnetic actuator is installed at the oil outlet at the end of the gear.

[0003]   In addition, a hydraulic lash adjuster that automatically adjusts the valve clearance is installed. The oil supply to this lash adjuster has always been done. Normally, it is performed from the oil passage for the cam journal of the cylinder head.

[0004]

[Problems to be solved by the device]

  Both the variable valve timing mechanism and the hydraulic lash adjuster If it is equipped with oil, the oil sent from the oil pump is distributed and supplied to each. However, if too much oil is sent to the lash adjuster, the valve will When the variable timing mechanism is activated, the oil supply to it is insufficient. Therefore, the response delay of the operation of the variable valve timing mechanism is likely to occur. Also, rush If the oil supply to the adjuster is limited, the oil to the variable valve timing mechanism It can accelerate the supply and increase the responsiveness of its actuation, but in this way, Oil is added to the lash adjuster especially during low-speed, low-load operation immediately after the engine is started. Takes a long time to be satisfied, during which time the lash adjuster functions sufficiently Not demonstrated.

[0005]   The present invention solves the above-mentioned problems by responding to the operation of the variable valve timing mechanism. Of the hydraulic lash adjuster to maintain good performance. An object of the present invention is to provide an engine lubrication device.

[0006]

[Means for Solving the Problems]

  In order to achieve the above object, the present invention operates when a hydraulic pressure is supplied. Hydraulically operated valve timing variable mechanism to change the valve timing It is equipped with a hydraulic lash adjuster that adjusts the rear lance, An engine in which the operation of the variable valve timing mechanism is stopped in the rotation region In the variable valve timing mechanism and the hydraulic lash adjuster. In the oil supply system having an oil passage for the When operating, the oil passage for the hydraulic lash adjuster should be throttled to A means provided with an oil supply adjusting means for forcibly supplying oil to the imaging variable mechanism Is.

[0007]   In this configuration, the first oil passage and the first oil passage with a passage area smaller than that The second oil passage is provided by branching from the main oil passage. Connect this valve to the first oil passage and connect this passage to the valve timing Between the state in which it is connected to the variable mechanism and the state in which it is connected to the hydraulic lash adjuster. A switching mechanism for switching is preferably provided as the oil supply adjusting means.

[0008]   The switching mechanism connects the first oil passage to the hydraulic lash adjuster. The valve timing variable mechanism to the oil discharge port when It is preferable that it is made possible.

[0009]

[Action]

  According to the above configuration, when the operation of the variable valve timing device is stopped Sufficient oil is supplied to the hydraulic lash adjuster to ensure valve timing. When the variable device is operating, the rush engine is operated in the operating range other than the low load and low rotation range. As long as the function of the caster is maintained, the hydraulic supply to The action of supplying oil to the variable minging device is enhanced.

[0010]

【Example】

  An embodiment of the present invention will be described with reference to the drawings.   FIG. 1 is a schematic view of an entire lubricating device according to an embodiment of the present invention. In this figure, The oil supply system includes an oil pan 1, an oil pump 2 and an oil filter 3. The main oil passage 4 is provided for circulating the oil that has passed. From this main oil passage 4, The passage 6 for guiding oil to the rank shaft bearing portion 5 and the camshaft bearing portion 7 are The passage 8 and the like for guiding the ill branch. In addition, the oil supply system has valve timing An oil passage is provided for the variable mechanism 10 and the hydraulic lash adjuster 11. When the variable valve timing mechanism 10 is activated, the lash adjuster is operated. Throttle the oil passage for 11 to force oil to the variable valve timing mechanism. An oil supply adjusting means for supplying is provided, and this oil supply adjusting means will be described in detail later. The switching mechanism 50 is configured as described above.

[0011]   The variable valve timing mechanism 10, as shown in FIG. The piston 13 is installed at the end of the camshaft 12 on the exhaust side and moves according to the hydraulic pressure. The rotation phase of the camshaft 12 is changed by.

[0012]   That is, the cam pulley 14 is integrally provided around the end of the camshaft 12. A case 15 is provided, and a space is provided at the tip of the camshaft 12 inside the case 15. The spacer 16 is fixed with bolts 17, and the spacer 16 and the case 15 are connected to each other. The piston 13 on the ring is incorporated. Inside and outside of this piston 13 The helical splines 18 and 19 are formed in the opposite directions, and these are splined. It is spline-fitted to the cursor 16 and the case 15. The piston 13 is a sp It is biased toward the tip side by the ring 20.

[0013]   An oil pressure chamber 21 is formed inside the tip of the case. Through the through hole 22 formed in the cam 17, the cam provided in the center of the camshaft 12 It communicates with the ile flow passage 23. The oil flow passage 23 extends from the switching mechanism. It is connected to the oil passage 24. Then, the hydraulic pressure is supplied to the hydraulic chamber 21. When not, the urging force of the spring 20 keeps the piston 13 in the basic position, In this state, the intake / exhaust valve overlap becomes a predetermined valve timing with a small overlap. . Further, when the hydraulic pressure is supplied to the hydraulic chamber 21, the piston 13 moves in response to the hydraulic pressure. The rotation phase of the camshaft 12 changes. In this operating state, the intake / exhaust valve is turned on. -The valve timing changes so that the overlap becomes larger.

[0014]   This valve timing variable mechanism 10 is operated and stopped by a control unit (not shown). It is performed by controlling the switching mechanism 50 by the switch, as shown in FIG. It is performed according to the operating state based on the region setting. That is, at least low rotation and low load In the region, the operation of the variable valve timing mechanism 10 is stopped (the oil pressure is It is not supplied) and the valve timing can be changed in the middle rotation and high load areas. The mechanism 10 is activated and is in an ON state (a state in which hydraulic pressure is supplied).

[0015]   On the other hand, the hydraulic lash adjuster 11 is, for example, a direct drive type valve operating valve. In the case of the mechanism, as shown in FIG. 3, the head is placed inside the body 31 whose upper surface is in contact with the cam 12a. A plunger 33 that abuts the valve stem 32 is provided. Hydraulic pressure is supplied to a high pressure chamber 34 provided inside through a check ball 35. . A plunger spring 36 is interposed in the high pressure chamber 34. And , While the high pressure chamber 34 is being replenished with oil according to the pressure drop, the valve clearer The structure is such that the impedance is automatically adjusted to zero.

[0016]   For the variable valve timing mechanism 10 and the hydraulic lash adjuster 11 The oil passage and the oil supply adjusting means to be used are schematically shown in FIG. 4 and the structure shown in FIG. In these figures, the main oil passage The first oil 41 and the second oil passage 42 are once branched in parallel from the passage 4. , These passages 41 and 42 merge again on the downstream side, and the oil that continues to the merged portion The passage 43 is guided to the hydraulic lash adjuster 11. The first oil passage The passage 41 has a relatively large passage area, and the second oil passage 42 is formed in the middle of the passage. The passage area smaller than that of the first oil passage 41 due to the fixed throttle 44 provided in the It is said that.

[0017]   The oil passage communicating with the first oil passage 41 and the variable valve timing mechanism 10. A communication passage 45 is provided between the passage 24 and the passage 24. Also, with oil supply adjusting means And a switching mechanism 50 having a switching valve 52 operated by a solenoid 51 is provided. Has been. The switching valve 52 is located in the communication passage 45, and the solenoid 5 The forward position and the backward position projecting toward the first oil passage 41 in accordance with the ON / OFF state of No. 1 Switch to position. When the switching valve 52 is in the retracted position, the first oil While opening the passage 41 to the oil passage 43 on the lash adjuster side, , The communication passage 45 is shut off (see FIG. 4), and when the switching valve 52 is in the forward position, The first oil passage 41 is shut off from the oil passage 43 on the lash adjuster side. In addition, the first oil passage 41 and the oil passage 2 on the variable valve timing mechanism side 4 is made to communicate with each other via a communication passage 45 (see FIG. 5). Further cut The exchange valve 52 also opens and closes the oil discharge port 53 connected in the middle of the communication passage 45. In the retracted position, the oil passage on the variable valve timing mechanism 10 side 24 and the oil discharge port 53 communicate with each other, and the oil discharge port 53 is in the forward position. Is designed to close.

[0018]   According to the apparatus of this embodiment as described above, the operation of the variable valve timing mechanism 10 is performed. In an operating region such as low rotation and low load where the switching should be stopped, the switching mechanism 50 is switched as shown in FIG. By setting the valve 52 to the retracted position, The hydraulic pressure supply is stopped, and at this time, the first and second oil passages 41, 4 The oil that has passed through both of the two is supplied to the lash adjuster 11. Therefore, start Immediately after that, a large amount of oil was sent to the lash adjuster 11 and the rush adjuster 11 quickly rushed. The adjuster 11 is filled with oil.

[0019]   Further, in this case, the oil passage 24 on the variable valve timing mechanism 10 side is not oiled. By communicating with the exhaust port 53, the operating state is turned off from the ON region in FIG. When shifting to the area, oil is discharged from the variable valve timing mechanism 10. Thus, the operation of the variable valve timing mechanism 10 is promptly stopped.

[0020]   On the other hand, when the operating range in which the variable valve timing mechanism 10 is to be operated is reached, as shown in FIG. As the switching valve 52 of the switching mechanism 50 is set to the forward position, the main oil passage The oil sent from No. 4 to the first oil passage 41 is the communication passage 45 and the oil passage 2 It is supplied to the variable valve timing mechanism 10 via 4. And at this time, The first oil passage 41 is blocked from the oil passage 43 on the side of the shoe adjuster 11. And only the oil passing through the second oil passage 42 is supplied to the lash adjuster 11. As a result, the oil supply to the lash adjuster 11 is suppressed and Only, the oil supply to the variable valve timing mechanism 10 is promoted, and the valve timing The operation of the variable valve mechanism 10 is performed with good responsiveness. Also this valve timing variable machine In the operating region of the structure 10, the lash adjuster 11 has already oiled the high pressure chamber 34. Is stored, and it is in a state where it is sufficient to replenish the oil little by little. Then, even if the oil passage is throttled, the function of the lash adjuster 11 is maintained.

[0021]

[Effect of device]

  As described above, the device of the present invention has a variable valve timing mechanism and a hydraulic type. In addition to being equipped with a shoe adjuster, the valve timing In order to stop the operation of the variable valve mechanism, During operation, throttle the oil passage for the hydraulic lash adjuster to close the valve tie. The oil supply adjusting means for forcibly supplying oil to the variable gear mechanism is provided. Therefore, in the low load and low rotation range, supply sufficient hydraulic pressure to the lash adjuster to While satisfying the function, this is The oil supply to the valve and enhances the responsiveness of the operation of the variable valve timing mechanism. You can

[0022]   In addition, the valve timing variable mechanism and the oil passage to the lash adjuster As a structure of the passage and the oil supply adjusting means, first and second oil passages are provided, and The second oil passage is connected to the hydraulic lash adjuster, and the first oil The valve timing variable mechanism and the hydraulic type If a switching mechanism is provided to switch to the state in which the lash adjuster is electrically connected, a simple The above effect is surely exhibited by the mechanism.

[0023]   Further, the switching mechanism guides the first oil passage to the hydraulic lash adjuster. The variable valve timing mechanism is connected to the oil discharge port when it is in the state of passing If it is configured to operate, the operation of the variable valve timing mechanism is stopped. The responsiveness when stopping can also be improved.

[Brief description of drawings]

FIG. 1 is a schematic view of an entire apparatus according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram showing an operating region of a variable valve timing mechanism.

FIG. 3 is a sectional view of a hydraulic lash adjuster.

FIG. 4 shows a structure of a main part of an apparatus according to an embodiment of the present invention,
It is a figure shown in the state where operation of a variable valve timing mechanism was stopped.

FIG. 5 is a diagram showing the same structure in an operating state of a valve timing variable mechanism.

[Explanation of symbols]

10 Valve timing variable mechanism 11 Hydraulic lash adjuster 41 First oil passage 42 Second oil passage 44 fixed aperture 50 switching mechanism 52 Switching valve 53 Oil discharge port

Claims (3)

[Scope of utility model registration request] 1. A hydraulically actuated valve timing variable mechanism that operates when hydraulic pressure is supplied to change valve timing, and a hydraulic lash adjuster that adjusts valve clearance, and is provided in a low-load low-rotation region. In an engine in which the operation of the variable valve timing mechanism is stopped, an oil supply system having an oil passage for the variable valve timing mechanism and the hydraulic lash adjuster is added to the hydraulic lash adjuster during operation of the variable valve timing mechanism. A lubricating device for an engine, characterized in that oil supply adjusting means for forcibly supplying oil to the variable valve timing mechanism is provided by narrowing the oil passage for the engine. 2. A first oil passage and a second oil passage having a passage area smaller than that of the first oil passage are provided so as to branch from the main oil passage, and the second oil passage is electrically connected to the hydraulic lash adjuster. At the same time, the first oil passage is provided with a switching mechanism as an oil supply adjusting means for switching between a state in which the passage is connected to the variable valve timing mechanism and a state in which the passage is connected to the hydraulic lash adjuster. Item 1. The engine lubricating device according to item 1. 3. The engine lubrication device according to claim 2, wherein the switching mechanism connects the variable valve timing mechanism to the oil discharge port when the first oil passage is in a state of being connected to the hydraulic lash adjuster. .