JPS62162711A - Lubricating device for tappet valve mechanism - Google Patents

Abstract

PURPOSE:To secure the amount and pressure of rush adjusters and a tappet valve system properly, by communicating a passage for the hydraulic type rush adjusters with an oil passage of a cam shaft through a pressure adjusting valve and a bypass passage and providing a relief valve with the oil passage. CONSTITUTION:Oil discharged from an oil pump 2 is supplied to a crank shaft and the like through a main passage 3 and an oil supply passage 4 and further introduced into a tappet valve system through an orifice 17 and it is supplied to respective rush adjusters 10 through a hydraulic type rush adjuster passage 12. The hydraulic type rush adjuster passage 12 has one end connected with an oil passage 8 at the internal center of a cam shaft 6 through a passage 14 having a pressure adjusting valve 13 and a bypass passage 15 and a relief valve 16 is provided with a groove 9 of the oil passage 8.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field 1] The present invention relates to a lubricating device for a valve mechanism equipped with a hydraulic lash adjuster, and more particularly, to a lubrication optical path structure for a lash adjuster and a camshaft, etc. .

In the Ol-I C type valve train of a vehicle engine, a hydraulic lash adjuster (hereinafter referred to as HLA) that automatically adjusts valve clearance is placed close to the camshaft and rocker arm. Some have one end supported in an end-pivot manner. In such a configuration, it is desirable to lubricate the HLA as well as lubricate the camshaft and rocker arm of the valve train.

[Prior art I] Conventionally, regarding the lubrication of an OI-I C type valve train equipped with an HLA, there is a prior art, for example, disclosed in Japanese Patent Application Laid-Open No. 59-60016. It is shown to lubricate and then oil the camshaft bearings.

On the other hand, as an example of lubricating multiple lubricated parts,
55706-@, which shows a plurality of lubricating parts and a plurality of pressure regulating valves.

[Problem to be Solved by the Invention 1] By the way, in the above-mentioned prior art with the configuration of the front sound, the lubrication system paths for the cam of the camshaft and the rocker arm are different, so there are multiple lubrication systems. The structure becomes complicated. Furthermore, since there is no means for adjusting oil or the like in the lubrication system, there are problems such as the inability to apply accurate lubrication during high-speed rotation.

In addition, there is a problem with this type of lubricating oil that when the oil pressure of the lubricating oil is low, the lubricating oil is not sent to all the lubricated parts.

The present invention has been made in view of these points, and it incorporates and integrates HLA into the lubrication system of the valve train, thereby reducing the amount of oil in the valve train and HLA during low and high speed rotation.

It is an object of the present invention to provide lubrication H1t for a valve train mechanism that ensures appropriate oil pressure.

(Means for Solving the Problems) In order to achieve the above object, the present invention communicates an oil passage from an oil pump with an HLA passage that supplies oil to a plurality of HLA, and connects an oil passage to one end of the HLA passage. A pressure regulating valve is installed, and H
The L A passage is connected to the oil passage of the camshaft via a pressure regulating valve and its bypass passage, and a relief valve is provided at one end of the oil passage of the camshaft.

[Operation 1] Based on the above configuration, 1-ILA is supplied with oil, and then the camshaft is supplied with oil and lubricated through the bypass passage or it and the pressure regulating valve. During high-speed rotation, the pressure regulating valve adjusts the HLA oil pressure, and the relief valve adjusts the camshaft oil pressure and oil amount.

Thus, according to the present invention, the valve train and 1-ILA are lubricated and integrated together, ensuring the required oil pressure for H and Δ during low speed rotation, and optimizing the HLA oil pressure during high speed rotation. It becomes possible to secure the required amount of oil for the valve train.

[Implementation example 1] Embodiments of the present invention will be described below based on the drawings.

In the drawings, reference numeral 1 is an oil tank, 2 is an oil pump, and 3 is a main passage for oil discharged from the oil pump 2. From this main passage 3, an oil supply passage 4 for a crankshaft, a piston, etc. branches off.

In the valve mechanism 5, a camshaft 6 has a plurality of cams 7, and an oil passage 8 at the center of the camshaft communicates with a groove 9 of one bearing 18 and is closed at the other end. Furthermore, it communicates with the passage 19 that each cam 7 opens.

For example, in the case of the end pivot system, a plurality of HLAIOs are lined up in a row along the camshaft 6, and each rocker arm 11 has one end supported by the HLAIO, the middle part touching the cam 7, and the other end being supported by the HLAIO. The end is attached to the valve.

Therefore, one HL that connects multiple HL A10
A main oil passage 3 communicates with the middle of the A passage 12 via an orifice 17, and one end of the HLA passage 12 communicates with the passage 14 having a pressure regulating valve 13 that acts as an accumulator to regulate the pressure, and its bypass passage 15. It communicates with the groove 9 of the oil passage 8. Moreover, in the groove 9 of the oil passage 8,
A relief valve 16 with a predetermined load is provided in series. The pressure regulating valve 13 and the relief valve 16 are each provided with a drain passage.

Next, the operation of the lubrication device for the valve train configured as described above will be explained.

First, the oil discharged from the oil pump 2 is supplied to the crankshaft etc. from the main passage 3 through the oil supply passage 4, and is further led to the valve train system and is sent to each HLA through the HLA passage 12.
10. During low-speed rotation, the pressure regulating valve 13 is closed because the oil pressure and the amount of oil are low, and all the oil pressure from the main passage 3 is applied to HLAlo. Therefore, if the set pressure of the pressure regulating valve 13 is set to the hydraulic pressure required for HLAlo to operate, HLAlo will ensure the required hydraulic pressure. At this time, the oil in the HLA passage 12 is supplied to the oil passage 8 of the camshaft 6 via the groove 9 only by the bypass passage 15,
Cam 7 and rocker arm 11. The bearing 18 is lubricated.

On the other hand, during high-speed rotation, when the oil pressure and oil amount increase, the pressure regulating valve 13 opens to reduce the pressure.
The rise in lo oil pressure is suppressed and optimized. The oil with high losses is then supplied to the oil passage 8 of the camshaft 6 from the passage 14 as well as the bypass passage 15, thereby securing the necessary oil amount. Here, the pressure regulating valve 13 and the relief valve 16
Since the set pressures are the same, when the oil pressure rises above the control oil pressure of the pressure regulating valve 13, the relief valve 16 acts as a relief and optimizes the oil pressure and oil amount.

Although one embodiment of the present invention has been described above, it can be similarly applied to 1-ILA used in various systems.

Effects of the Invention 1 As described above, according to the present invention, the necessary amount of oil for the HLA is ensured during low-speed rotation, so the HLA function can be maintained well, and the oil required for the valve train during high-speed rotation can be maintained. Since the amount of oil is ensured, good lubrication can be achieved.

[Brief explanation of drawings]

The drawing is a configuration diagram showing an embodiment of a lubricating device for a valve train according to the present invention. 2... Oil pump, 3... Main oil passage, 5
... Valve mechanism, 6... Camshaft, 8... Oil passage, 10... HLA, 12... HLA passage, 13.
...Pressure regulating valve, 15...Bypass passage, 16...Relief valve.

Claims (1)

[Claims] An oil passage from an oil pump is communicated with a hydraulic lash adjuster passage that supplies oil to a plurality of hydraulic lash adjusters, and the hydraulic lash adjuster passage is connected to a pressure regulating valve and its bypass passage. A lubricating device for a valve mechanism that communicates with the camshaft oil passage and has a relief valve at one end of the camshaft oil passage.