JPS60195319A - Oil lubricating mechanism for valve selector - Google Patents

Abstract

PURPOSE:To supply oil sufficiently to the sliding surface of a rocker arm by installing an oil jet to a cylinder head cover together with providing this rocker arm with a through hole which supplies jetted oil to the sliding surface of the rocker arm. CONSTITUTION:Usually, a hydraulic lifter 30 reiterates expanding/contracting motion in a small scale in order to conduct well-know actions. However, when an engine load is small, a micro-computer operates a solenoid valve 50 by means of engine input signals in order to push a ball check valve 36 so as to connect a pressure chamber 34 to a reservoir 33. At this time, a rocker arm 15, which usually rocks taking the middle point of a shaft 20 as a fulcrum in order to open/close a valve 12, rocks taking the valve top end 12a as a fulcrum in order to suspend valve lift mechanism. As a result, the valve no longer opens or closes. Oil in an oil passage 23 is jetted from an oil jet 24 and directly supplied via a through hole 26 to an inner sliding surface 27, thereby sufficiently lubricating this sliding surface.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention and Field of Application] The present invention relates to an oil lubrication Wk mechanism for a valve selector.
This invention relates to an oil lubrication mechanism for a rocker arm in a valve selector in which a pressure-feeding hydraulic lifter is arranged in the II structure to control the stoppage of valve operation.

[Prior art]

Traditionally, with the aim of saving energy and improving vehicle fuel efficiency,
Various types of valve selectors for internal combustion engines have been proposed, and the one disclosed in Japanese Unexamined Patent Publication No. 180709/1983 is well known as an example. That is, in this valve selector, a well-known pressure-feeding hydraulic lifter is slidably disposed within a cylinder head cover, and both ends of the hydraulic lifter are in contact with a cam and an upper end of the valve, and the lower part of the hydraulic lifter is fixed to a rocker support. Take a rocker arm that swings around a rocker shaft fixed to the Rocker Sabo I.A solenoid valve that senses the engine input signal and activates causes the valve stem to push open the hydraulic lifter's check valve. It removes rigidity. Therefore, since the hydraulic lifter and rocker support move up and down together, the rocker arm does not swing around the rocker shaft due to the rotation of the cam, but instead swings between the upper end of the valve and the rocker arm. The valve begins to swing up and down using the contact as a fulcrum, and the lift operation of the valve stops.

Therefore, such an oil supply mechanism to the rocker arm of the valve selector was proposed in Japanese Patent Application Laid-open No. 170669/1983, which is an earlier application filed by the applicant of the present invention. This oil supply mechanism has a main oil passage in the cylinder header that supplies oil to the hydraulic lifter, a vertical hole that communicates with the main passage, and a pipe that moves up and down together with the rocker support in the vertical hole. The pipe is slidably inserted, and the oil in the vertical hole is passed through the sliding surface of the rocker arm through a passage provided in the center hole of the pipe, the lower bottom surface of the hydraulic lifter, and the rocker support. It is.

[Problems in the prior art and technical analysis thereof] The above-mentioned oil supply mechanism has the following functions:
A vertical hole that connects to the main oil passage, a center hole of a pipe that is slidably disposed within the vertical hole, a lower bottom surface of the hydraulic lifter that communicates with the center hole, and a rocker support that communicates with the lower bottom surface of the hydraulic lifter. Since it has a structure with an inner passage,
The oil supply passage is complicated and the diameter of the oil passage cannot be increased, making it difficult to secure a sufficient amount of oil supplied from the main oil passage to the rocker arm, and the supply amount may be insufficient. There were many. As a result, there was a disadvantage in that the sliding surface of the rocker arm wore out. In addition, the structure of the oil supply passage is complicated,
In particular, since the pipe can be slidably installed in the vertical hole, processing precision is required for the internal diameter of the vertical hole and the external diameter of the pipe, resulting in a significant increase in manufacturing costs. It was something.

(Technical Problem) Therefore, the technical problem of the present invention is to ensure a sufficient amount of oil supplied to the rocker arm.

[Technical means]

The technical measures taken to solve the above technical problems are:
In order to supply oil to the hydraulic lifter, an oil pump i is installed on the cylinder head force bar to inject oil in an oil passage formed in the rad cover to the cylinder, and the oil injected from the oil jet is installed on the cylinder head force bar. The rocker arm is provided with a through hole that supplies the sliding surface of the rocker arm.

[Effect of technical means]

Oil pumped by an oil pump or the like is supplied to an oil passage in the cylinder head cover, and the oil in the oil passage is injected toward the rocker arm by an oil jet. Since the rocker arm is provided with a through hole that communicates with the inside, oil injected by the oil jet is supplied to the sliding surface of the rocker arm through the through hole. In this way, since oil is directly injected onto the rocker arm using an oil jet, a sufficient amount of oil can be supplied to the sliding surface of the rocker arm.

[Special effects produced by the present invention]

As described above, the present invention has an oil jet that opens to the outside, so the oil jet also functions as an air vent hole for releasing air contained in the oil to the outside. Further, since the oil jet injects the oil in the oil passage in the cylinder head cover, oil can be supplied to the rocker arm and lubrication can be started immediately after the engine is started. Furthermore, since no special passage member is required for supplying oil to the rocker arm, the weight of the device does not increase and the structure does not become complicated.

〔Example〕

An embodiment embodying the present invention will be described below with reference to the accompanying drawings. The drawing is a longitudinal cross-sectional view of an oil lubrication fk mechanism for a valve selector showing an embodiment of the present invention in a valve lift mechanism for an internal combustion engine. A combustion chamber formed above a piston (not shown) and a cylinder head boat IO
Communication with the valve 1 is controlled to open and close by a valve 12.
2 is always urged to close by a valve spring 14 supported by a retainer 13. The rocker arm 15 has one end 15a in contact with the upper end 12a of the valve 12 via an adjustment screw 17 fixed by a nut 16, and the other end 15b in contact with the cam surface of the cam 18. In addition, the rocker arm 16 is provided with a rocker support 19.
The rocker arm 16 is fixed to the rocker support 1
It is possible to swing around the axis of a rocker shaft 20 which is pivotally supported at the rocker shaft 9. When the cam 18 rotates, the rocker arm 15 swings, and the valve 12 repeatedly opens and closes via the adjusting screw 17.

In the hollow portion 19a of the rocker support 19, a lower lid body 3I of a known pressure-feeding hydraulic lifter 30 is fixed in its normal size. Further, the upper lid body 31 of the hydraulic lifter 30 is slidably inserted into the sleeve 22 fixed to the bore 21a of the rad cover 21 to the cylinder. A plunger 3 is disposed within the lifter body 31 so as to be able to reciprocate in the vertical direction, and a reservoir 33 is formed inside the plunger 32 . Inside the reservoir 33 is an oil path 23. which is formed in the rad cover 21 from an oil pump (not shown) to the cylinder. Passage 22 of sleeve 22
a. Oil is supplied through the 1JIl path 32a of the plunger 32.

A pressure chamber 34 is formed inside the rick body 31 in the lower part thereof, and a ball check valve 36 is disposed in the pressure chamber 34 to open and close an oil passage 35 provided at the center of the bottom of the plunger 32. This check valve 3G allows oil to flow from the reservoir 33 to the pressure chamber 34, but prevents oil from flowing from the pressure chamber 34 to the reservoir 33.

Further, the check valve 36 is always biased in the closing direction by the other end of the spring 38, one end of which is supported by the retainer 37. A plunger return spring 39 having a larger load than the spring 38 is further interposed in the pressure chamber 34, and the plunger 32 is always urged upward in the drawing by the spring 39.

A solenoid valve 50 fixed to the upper part of the cylinder head cover 21 is controlled and operated by sensing engine input signals such as vehicle speed, throttle opening, and engine temperature by a microphone computer (not shown). The valve stem 51 of the solenoid valve 50 passes through the center hole 22b in the upper end surface of the sleeve 22 and projects into the reservoir 33 so as to be movable in the vertical direction.

Now, the cylinder head cover 21 has an oil passage 23.
An oil jet 24 is formed for injecting oil therein toward the rocker arm 15, and a bore 25 through which the jet 24 opens is in the same direction as a through hole 26 formed in the mouth/linker arm 15. In other words, bore 25
The opening direction of the through hole 2G to the outside and the opening direction of the through hole 2G to the outside are opposite to each other. The through hole 26 is located inside the rocker arm 15, that is, on the sliding surface 2 with the rocker shaft 20.
It is connected to 7.

Next, the operation of the embodiment described above will be explained. Generally speaking, the hydraulic lifter 30 performs a well-known operation by repeating small-sized expansion and contraction movements, but when the engine load is small,
Microcomputer, such as engine load, vehicle speed, etc.
When the solenoid valve 50 is actuated by sensing engine input signals such as throttle opening and engine temperature, the valve stem 51 moves downward in response to the actuation of the valve 50 and presses the check bar rev 36 downward. to open the oil passage 35. Therefore, since both the pressure chamber 3a and the reservoir 33 are in communication, the oil in the pressure chamber 34 flows out into the reservoir 33, and due to the rotation of the cam 18, the rocker shaft 20 swings about the center of the rocker shaft 20 as a fulcrum during normal operation. The rocker arm 15 that had been moving to open and close the valve 12 is now
2a as a fulcrum, and the valve lift mechanism is stopped so that the valve 12 does not open or close. 15
The liquid is injected in the direction of , and is supplied to the internal sliding surface 27 through the through hole 26 of the rocker arm 15 to lubricate the sliding surface 27 .

[Brief explanation of the drawing]

The drawing is a longitudinal cross-sectional view of an oil lubrication mechanism of a pulse selector showing an embodiment of the present invention. 12... Valve, 12a... Upper end of the valve 9L15
...Rocker arm, 18...Cam, 19...Rocker support, 20...Rocker shaft, 21...
...Nodokahar to the cylinder, 23...Oil passage, 2
4...Oil jet, 26...Through hole, 27...
・Sliding surface, 30... Pressure feed type hydraulic lifter, 36... Pole check valve, 50... Solenoid valve Patent applicant 1 Reio Nakai, Representative of Ishishiken Gogishiki Company

Claims (1)

[Claims] A pressure-feeding hydraulic lifter is slidably disposed within the cylinder cover, an oil passage for supplying oil to the hydraulic lifter is formed within the hydraulic cover, and a rocker support for fixing the lower part of the hydraulic lifter is provided. A check valve of the hydraulic lifter is installed with a rocker arm that swings around a rocker shaft whose both ends abut the cam and the upper end of the valve and which is fixed to the rocker support, and is operated by a solenoid valve that senses an engine input signal. In the valve selector that stops the operation of the valve by pushing open the hydraulic lifter and removing the rigidity of the hydraulic lifter, an oil passage i is provided in the head cover for injecting oil in the oil passage to the rocker arm, and An oil frIJ cleaning mechanism for a valve selector, wherein the rocker arm is provided with a through hole for supplying oil injected from the oil jet to the sliding surface of the rocker arm.