JPS6248045B2 - - Google Patents

Abstract

PURPOSE:To exactly supply a lubricating oil to the sliding portion of a locker arm by connecting the oil passage of a housing to the oil passage of a locker support in a variable cylinder device in an internal combustion engine. CONSTITUTION:In a variable cylinder device for internal combustion engine, a valve bar by which to press a check ball 21 by a pressure type rush adjustor and a solenoid valve 25 is provided. A vertical hole 29 is provided in a housing 26, and a pipe 30 is slidably inserted into the hole 29. Oil in the main passage 15 enters from the passage 17 into a reservoir 14 and reaches the passage 31 through the aperture between the central hole 28 and the valve bar 27. The oil goes further to the vertically directed passage 33 through the vertical hole 29 and a horizontal passage 32, lubricating the sliding face of the locker arm 2. Lubricating oil can thus be exactly supplied to the sliding face of the locker arm.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a mechanism for feeding oil to a rocker arm in a rocker arm movable variable cylinder device in which a pressure-feeding latch adjuster is disposed in a valve lift mechanism.

In the past, various types of variable cylinder devices for internal combustion engines have been proposed for the purpose of energy saving and fuel efficiency improvement, and the applicant of the present invention also proposed a valve lift system using a pressure-feed type latch adjuster in Japanese Patent Application No. 57-62693. We proposed a variable cylinder device for internal combustion engines that is installed in a mechanism.

In this variable cylinder device, the rocker arm is movable, but because the rocker arm is movable, lubrication is extremely difficult.

Even if the rocker arm of the present invention is movable,
The objective is to obtain an oil feed mechanism to the rocker arm that can ensure reliable lubrication.

To achieve the above objects, the present invention includes a pressure-feed latch adjuster attached to a housing, a solenoid valve that operates by sensing an engine input signal, and a latch adjuster that operates in response to the operation of the solenoid valve. In a variable cylinder device for an internal combustion engine, the lower part of the latch adjuster is fixed in a variable cylinder device for an internal combustion engine, which is provided with a valve stem that presses a check ball of the latch adjuster to remove the rigidity of the latch adjuster and stop valve operation. For car support,
A rocker arm is attached to the housing, the rocker arm having both ends abutting against the cam and the upper end of the valve of the valve lift mechanism and swinging around a rocker shaft fixed to the rocker support, and a rocker arm that is attached to the housing to be connected to the reservoir of the latch adjuster. a main passage for supplying oil; a passage communicating with the main passage through a central hole provided in an adjuster support above the latch adjuster through which the valve stem passes and communicates with the reservoir; a vertical hole that communicates with the rocker support, and a passageway that is inserted into the vertical hole so as to be slidable up and down and communicates with a center hole of a pipe that is integrated with the rocker support; The rocker shaft is provided with a vertical passage that communicates with the bottom surface of the lower part of the star, and the rocker shaft has a passage that communicates with the vertical passage, a center hole that communicates with the passage, and a sliding surface between the center hole and the rocker arm. It is configured with a passageway that communicates with the
When engine negative pressure is small, the pressure-feed latch adjuster stops valve lift operation, and the solenoid valve is activated by a signal from the microcomputer to move the valve stem downward and open the check valve.

Therefore, due to the rotation of the cam, the Rocker arm swings up and down using the contact point between the upper end of the valve and the Rocker arm as a fulcrum, rather than swinging around the Rocker shaft as a fulcrum in the case of valve lift operation. The pipe integrated with the Rocker support slides up and down while inserted into the vertical hole of the housing, so the vertical hole communicating with the main oil passage and the sliding surface of the Rocker arm Communication is continued with the center hole of the rocker shaft which communicates with the rocker support through the passage of the rocker support and the center hole of the pipe.

For this reason, even when the Rocker arm is in a movable state, the oil passage in the housing and the oil passage in the Rocker support are always in communication via the vertical hole in the housing and the pipe in the Rocker support, so the lubricating oil is Supply to the sliding surface of the rocker arm is ensured, and even if the rocker arm is movable, it has the effect of completely solving the problem of lubrication.

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a longitudinal sectional view of an oil feed mechanism showing an embodiment of the present invention in a valve lift mechanism of an internal combustion engine;
FIG. 2 is a sectional view taken along line A--A in FIG. 1. In the figure, 1 is a valve that controls opening and closing of communication between a combustion chamber formed above a piston (not shown) and a cylinder head port, and the valve 1 is attached to one end 2a of a rocker arm 2 so as to be always closed by a spring (not shown). The upper end portion 5 is in contact with an adjuster screw 4 fixed by a nut 3.

The other end 2b of the rocker arm 2 is in contact with the cam surface of the cam 6. In addition, Rotsuker Arm 2 is
The rocker shaft 8, which is fixed to the rocker support 7 and pivotally supports the rocker arm 2 to the rocker support 7, can swing around the axis of the rocker shaft 8 as a fulcrum. When the cam 6 rotates, the rocker arm 2 swings, and the valve 1 repeatedly opens and closes via the adjuster screw 4.

The hollow part 7a of the rocker support 7 has a body 1 in the lower part of the well-known pressure-feed type latch adjuster 9.
1 is press-fitted and fixed. The upper body 11 of the latch adjuster 9 is connected to the hollow portion 10 of the adjuster support 10 fixed to the housing 26.
It is slidably inserted into a. Body 11 is
A cylinder 12 with an open top end is formed inside, and the plunger 13 moves vertically and reciprocates, and a plunger 13 disposed inside the cylinder remains stationary.

A reservoir 14 is formed inside the plunger 13, and inside the reservoir 14 there is a main passage 15 from an oil pump (not shown), passages 17 and 18 between the adjuster support 10 and the plunger support 16.
Oil is supplied through.

A pressure chamber 19 is formed below the plunger 13 in the cylinder 12 of the body 11, and a ball check valve 21 for opening and closing an oil passage 20 provided at the center of the bottom of the plunger 13 is provided on the pressure chamber 19 side. It is arranged. This check valve 21
allows oil to flow from the reservoir 14 to the pressure chamber 19, but prevents oil from flowing from the pressure chamber 19 to the reservoir 14. The check valve 21 is biased in the closing direction by a spring 24 whose one end is supported by a retainer 23 which is held on the plunger 13 by a spring 22.

Reference numeral 25 designates a solenoid valve fixed to a housing 26 above the adjuster support 10, and is controlled and operated by sensing engine input signals such as vehicle speed, throttle opening, and engine temperature by a microcomputer (not shown). 27
is the valve stem of the solenoid valve 25, which is inserted into the reservoir 14 through the center hole 28 in the upper end surface of the adjuster support 10 so as to be slidable in the vertical direction.

29 is a vertical hole provided in the housing 26, into which a pipe 30 fixed to the rocker support 7 is inserted so as to be vertically slidable. Further, an oil passage 31 communicating with the vertical hole 29 is provided in the housing 26, and the passage 31 is formed in the gap between the main passage 15 provided in the housing 26, the center hole 28, and the valve stem 27, and the passage 18. , 17. Furthermore, the center hole 30a of the pipe 30 communicating with the vertical hole 29
is the horizontal passage 3 provided in the rocker support 7.
2. It communicates with the center hole 35 of the rocker shaft 8 through the chamfered part 11a on the bottom surface of the body 11, the vertical passage 33 of the rocker support 7, and the passage 34 provided in the rocker shaft 8, and from the center hole 35 the passage 36
The oil is made to flow onto the sliding surface of the Rocker arm 2 through this process. 37 is a lid that closes the opening of the center hole 35 of the rocker shaft 8, and 38 is a set screw that fixes the rocker shaft 8 to the rocker support 7.

Next, the operation of the embodiment described above will be explained. Normally, the latch adjuster 9 performs a well-known operation by repeating small-sized expansion and contraction movements, but when the engine load is small, the microcomputer When engine input signals such as pressure, vehicle speed, and slot opening are sensed and the solenoid valve 25 is operated, the valve stem 27 moves downward in response to the operation of the valve 25, and the check valve 2
Press 1 downward to open the oil passage 20.

Therefore, since the pressure chamber 19 and the reservoir 14 communicate with each other, the oil in the pressure chamber 19 moves into the reservoir 14, and due to the rotation of the cam 6, the rocker shaft 8 swings around the center of the rocker shaft 8 during normal operation. However, the rocker arm 2, which used to move the valve 1 up and down to open and close the valve, now swings around the upper end 5 of the valve 1 as a fulcrum, stopping the valve lift mechanism and preventing the valve 1 from opening and closing. become.

On the other hand, the oil in the main passage 15 is
It enters the reservoir 14, passes through the gap between the center hole 28 of the adjuster support 10 and the valve stem 27, reaches the passage 31, and then passes through the vertical hole 29 and the center hole 30a to the horizontal passage 32 and the chamfered part 11a on the bottom of the body 11. It reaches the longitudinal passage 33, flows through the passage 34 into the center hole 35 of the rocker shaft 8, and
The sliding surface of the rocker arm 2 is lubricated through the passage 36.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view of the oil feed mechanism of the rocker arm showing an embodiment of the present invention, and FIG.
It is an A sectional view. Explanation of the main parts of the diagram, 1... Valve, 2... Locker arm, 6... Cam, 7... Locker support, 8... Locker shaft, 9... Pressure feed type latch adjuster, 10... Adjuster support , 11...Body, 13...Plunger, 14
...Reservoir, 15... Main passage, 16... Plunger support, 17, 18... Passage, 19...
...Pressure chamber, 21...Ball check valve, 25
... Solenoid valve, 26 ... Housing, 2
7... Valve stem, 28... Center hole, 29... Vertical hole, 3
0... Pipe, 30a... Center hole, 31... Passage, 32... Horizontal passage, 33... Vertical passage, 3
4...passage, 35...center hole, 36...passage.

Claims (1)

[Claims] 1. A pressure-feed latch adjuster attached to a housing, a solenoid valve that operates by sensing an engine input signal, and a valve stem that presses a check ball of the latch adjuster in response to the operation of the solenoid valve. In a variable cylinder device for an internal combustion engine, which removes the rigidity of the latch adjuster and stops valve operation, the lower part of the latch adjuster is fixed to a rocker support that has a cam and a valve lift mechanism at both ends. A rocker arm is attached that contacts the upper end of the valve and swings around a rocker shaft fixed to the rocker support, and the housing has a main passage for supplying oil to the reservoir of the latch adjuster. and a passage communicating with the main passage through a central hole through which the valve stem provided in the adjuster support at the upper part of the latch adjuster communicates with the reservoir, and a vertical hole communicating with the passage. The rocker support is provided with a passage that is vertically slidably inserted into the vertical hole and communicates with a center hole of a pipe that is integral with the rocker support, and a passage that communicates with a center hole of a pipe that is integrated with the rocker support, and a passage that is connected to the bottom surface of the lower part of the lash adjuster. A longitudinal passage communicating with the rocker shaft is provided, and the rocker shaft has a passage communicating with the longitudinal passage, a center hole communicating with the passage, and a passage communicating between the center hole and the sliding surface of the rocker arm. An oil feed mechanism to the Rotsuker arm is featured.