JPS5923018A - Valve stopping device for variable displacement type engine - Google Patents

Abstract

PURPOSE:To enable the titled valve stopping device to respond quickly for switching the operation of a valve by a method wherein a check valve of an oil pressure tappet for supporting the fulcrum of rocking of a rocker arm is opened by making the valve attracted to a high pressure chamber through an electromagnetic mechanism in response to a cylinder reduction switch. CONSTITUTION:The fulcrum of rocking of the rocker arm 3 is formed on top of a sliding member 43 of the oil pressure tappet. When the electromagnetic mechanism 19 is excited due to the closing of the cylinder reduction switch 57, a rod 51 is attracted to open the check valve 41 so that an oil in the high pressure chamber 29 is discharged into a low pressure chamber 31. Accordingly, when the engine is operated with a reduced number of cylinders, the movement of a cam 7 is not transmitted to an air intake and exhaust valve 5. As a result, the variable control of the oil pressure is not required and the switching between the operation and the non-operation of the valve 5 is performed quickly.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a variable exhaust @ type engine that can change the number of operating cylinders of the engine, and in particular, the f11 operation of the valve that operates against nine cylinders when fuel supply is stopped. This concerns the engine. In general, an engine is equipped with a 11-cylinder variable exhaust engine, which reduces the number of cylinders to which fuel is supplied depending on the operating conditions of the engine, reduces the operating N1 cylinder, and reduces the number of cylinders to which fuel supply is stopped. IIi: It is widely known as a method that also stops valve operation and reduces fuel consumption.

Conventionally, the valve stop device for the above-mentioned variable displacement engine is a two-part system in which the rocker arm is divided into the camshaft side and the intake/exhaust valve side, and the two can be integrated or separated by inserting and removing the key. - There was an arm type, and there was also a hydraulic tappet type, which divided the tappet into upper and lower halves, applied hydraulic pressure between them to allow normal operation, and released the hydraulic pressure to disable the tappet.

However, the disadvantage of the type of model that splits the rocker arm into two is that it requires adjustment of the timing for inserting and removing the key.1 Also, the hydraulic tappet type has less switching response than the type that splits the rocker arm into two. Although it is quick, the tappet is activated and deactivated by controlling the pump oil pressure, so various parts must be assembled to make the discharge pressure variable, making assembly difficult. there were.

The present invention was devised in response to such conventional problems, and its purpose is to provide a hydraulic tappet type with quick switching response, which does not require variable control of hydraulic pressure. This invention provides a variable displacement displacement type engine lube stop device.

In order to achieve the above-mentioned object, this invention has one end of the lower surface of the rocker arm contact the intake/exhaust valve tK, the other end of the lower surface contact the valve stop mechanism, and the center of the upper surface of the rocker arm is supported by the cam shirt K. A valve operating mechanism of a valve stop device configured to open and close intake and exhaust valves, the valve stop d-mechanism being provided in a housing attached to the upper part of the cylinder head,
This valve stop mechanism includes a sleeve with a concave cross section embedded in the housing, a sliding body with a concave cross section that is housed in the sleeve so as to be able to rise and fall and comes into contact with the lower surface of the other end of the rocker arm, and A plunger having an orifice passage in one part, a high pressure chamber defined through the plunger and a low pressure chamber having a pressure oil supply/discharge port, and the high pressure chamber being constantly biased in a direction to close the orifice passage. a check ball and a low pressure chamber, a rod operated by an electromagnetic mechanism to press the check ball, and a cylinder reduction switch connected to a power source and controlling energization and de-energization of the electromagnetic mechanism. The gist is that when the passage is closed by a cylinder switch, the electromagnetic mechanism is energized to pull the check ball through the rod, so that the pressure oil in the high pressure chamber is discharged to the low pressure chamber side. .

Embodiments of the present invention will be described below based on the drawings.

In FIGS. 1 and 2, the intake and exhaust valves 5 are in contact with the lower surface of one end of the rocker arm 6 on the upper part of the cylinder head 1, while the camshaft 7 is in contact with the upper center surface of the rocker arm 6, and the lower surface of the other end of the rocker arm 6 is in contact with the lower surface of the rocker arm 6. A valve stop mechanism 11, which will be described below, provided in the housing 9 of the two parts of the cylinder head 1 is in contact with the cylinder head 1.

That is, in the hole 16 formed in the housing 9,
An lenoid 19 as an electromagnetic mechanism in which the rod 15 is biased by a spring 17 and a sleeve 21 having a concave cross section are embedded. Preoperative protrusion ■7 (・ru.

-1, A plunger 25 having a concave cross section is pushed upwardly by a spring 27 and slidably inserted into the sleeve IJ-b21. is divided into a lower high pressure chamber 29 and an upper low pressure chamber 61 having a #1" exit, and the high pressure chamber 29 and low pressure chamber 61 are communicated through an orifice passage 36 bored in the plunger 25. A mesh spring retainer 7 is slidably mounted on the protrusion 65 around the orifice passage 66 of the plunger 25, and a check ball is attached to the -1- orifice passage 66 via the spring 69. 41 is pressed and biased, and a spring presser foot 7 is attached to the tip of the rod 15.

On the other hand, a sliding body 46 having a concave cross section is fitted into the upper part of the plunger 25 so as to be movable up and down with respect to the sleeve 21,
One end of the sliding body 46 is brought into contact with the lower surface of the other end of the rocker arm 3.

And, in a passage 51 connecting between the cargo ship II 45 of the low pressure chamber 31 formed by the two-part plunger 25 and the sliding body 43 and the oil pan △ 49 as a pressure oil supply source provided with a pump 47, An electromagnetic cutoff valve 56 is provided as an on-off valve.

Further, the electromagnetic cutoff valve 53 is connected to a cylinder reduction switch 57 which is connected to a power source 55, and the solenoid 19 is linked to the cylinder reduction switch 57.

In the two-channel configuration, first, during normal operation of the engine, engine oil from the oil pan 49 is supplied via the pump 47 to the communication channel 51, the low pressure chamber 31, and the orifice channel 66. The check ball 41 is pushed down against the spring 69 to supply and fill the high pressure chamber 29 with oil.

Then, oil is discharged from the outlet 1-'' of the low pressure chamber 61 (not shown), thereby causing a check-up.

41 closes the orifice passage 66 and the high pressure chamber 29 is hermetically sealed.
6 is pressed, the plunger 25 remains locked (thereby, the rocker arm 3 is moved to the sliding body 46);
"F is moved, and the intake and exhaust valves 5 are operated."

Next, for example, when the engine load decreases and the cylinder reduction switch 57 is turned on, the electromagnetic cutoff valve 56 closes the passage 51, the solenoid 19 is energized and excited, and the internal rod 15 is pulled downward. , check ball 4
1 opens the orifice passage 66, and in this state, when the camshaft 7 operates and the sliding body 46 is pushed downward, the plunger 25 slides downward, and the oil in the high pressure chamber 29 flows into the low pressure chamber. 61 to the discharge 1, and as shown by the chain line in FIG.
Therefore, the intake and exhaust valves 5 do not operate.

When the engine is loaded again, the cylinder reduction switch 57 is turned OFF, the electromagnetic cutoff valve 56 is opened, oil is supplied to the high pressure chamber 29, and the intake and exhaust valves 5 operate normally in correspondence with the camshaft 7 as described above. do. .

As described above, this invention has the lower surface of one end of the rocker arm contacting the intake/exhaust valve and the lower surface of the other end contacting the valve stop mechanism, and the center of the upper surface of the rocker arm being supported by the camshaft. A valve operating mechanism for a valve stop device that opens and closes a valve, and is a valve mechanism for a cylinder head.
The valve stop mechanism is provided in the housing attached to the two parts, and the valve stop mechanism is housed in a sleeve having a concave cross section embedded in the housing and can be raised and lowered within the sleeve,
and a sliding body having a concave cross section that contacts the upper surface of the other end of the rocker arm, a plunger having an orifice passage in the lower part of the sliding body, and a high pressure chamber and a pressure oil supply/discharge port defined through the plunger. a check ball which is always urged in the direction of closing the orifice passage in the high pressure chamber; a rod which operates by an electromagnetic mechanism to press the check ball; and a power supply connected to the low pressure chamber. and a de-energizing switch for controlling the energization and de-excitation of the electromagnetic mechanism, and when the passage is closed by the de-energizing switch, the electromagnetic mechanism is energized and the check ball is pulled through the rod to generate high pressure. By discharging the pressure oil in the chamber to the low pressure chamber side, there is no need to incorporate various parts for variable control of the pump oil pressure.Also, since it is not a type that is incorporated into the rocker arm, the rocker arm Since the operational balance is similar to that of a normal type engine without a valve stop mechanism, it has the effect of being reliable.

In addition, assembly is easy to work with, which has the advantage of increasing production efficiency.

[Brief explanation of the drawing]

FIG. 1 is an explanatory overall cross-sectional view of the valve stop device of the present invention;
FIG. 2 is an enlarged sectional view of the main part of FIG. 1. 1... Cylinder head, 6... Rocker arm, 5
... Intake and exhaust valve, 7... Camshaft, 9... Nose mounting, 11... Valve stop mechanism, 15... Rod,
19...Solenoid, 21...Sleeve, 25...
・Plunger, 29...high pressure chamber, 61...low pressure chamber,
66... Orifice passage, 41... Check ball, 46... Sliding body, 45... Supply port, 49... Oil pan, 51... Passage, 56... Solenoid cutoff valve, 5
7...Cylinder reduction switch, 1 agent: Patent attorney Ogawa
Shin − Patent Attorney Masaru Noguchi Patent Attorney Kazuhiko Saishita

Claims (1)

[Claims] The valve actuator of the valve stop device has the lower surface of one end of the rocker arm in contact with the intake/exhaust valve and the lower surface of the other end in contact with the valve stop mechanism. A high pressure chamber partitioned through a high pressure chamber and a low pressure chamber provided with pressure oil feeding L1, a check ball that is always biased in the direction of closing the orifice passage in this high pressure chamber, and the low pressure chamber operated by an electromagnetic mechanism, Valve stop device for air displacement engines.