JPH0519003B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention mainly relates to an operation control valve device for a variable valve operation means in an engine for a motorcycle or other vehicle.

Conventionally, as shown in the first diagram, a hydraulically operated valve stop means d has a hydraulic chamber c into which pressure oil is introduced and drawn out through a control valve b in a cylinder head a at the top of the engine, as shown in the first diagram. A type in which the valves of the intake and exhaust system of the engine can be freely switched to a rest state in which they are not driven by the valve cam, and the valve b is provided with a spool valve f that is slidable along the longitudinally extending valve housing e. and configure it into the head a.
A type that is fixedly installed on the top of the engine has been proposed, but in this case, a type in which the control valve b is installed horizontally in the left and right direction parallel to the crankshaft of the engine in the valve casing e as shown in the figure is generally accepted. However, in such a valve, the valve b is affected by the vibrations of the engine, which tends to cause an inadvertent switching operation, which is a disadvantage. To explain further, in the case of a 4-cycle in-line 4-cylinder engine, for example, the engine generally generates large vibrations in the vertical direction and about half as large vibrations in the horizontal direction, that is, in the direction parallel to the crankshaft. Therefore, the valve b is likely to cause an inadvertent switching movement when this is applied, and to prevent this, for example, it is necessary to increase the elasticity of the spring or the magnetic force of the operating solenoid, which is undesirable. .

The object of the present invention is to provide a device that reduces such inconveniences as much as possible, and has a hydraulic chamber in the cylinder head at the top of the engine, into which pressure oil is introduced and extracted through a control valve. A hydraulically actuated variable valve operation means is provided to freely change the operating state of the valves in the intake and exhaust system of the engine, and the control valve is housed in a longitudinally extending cylindrical valve housing, and a spool valve is installed along the cylindrical valve housing. Where the control valve is of a slidable type, the control valve is provided in the valve housing,
The engine is characterized in that it is mounted in an inclined position slightly tilted in the vertical direction from a horizontal position in the left-right direction substantially parallel to the crankshaft of the engine.

Next, an example in which the present invention is applied to variable valve operation means will be described with reference to the drawings. Figures 2 to 5
The figure shows one example. 1 is an engine mounted on the body of a two-wheeled motor vehicle, 2 is a cylinder head at the top of the engine, and pressure oil is introduced into the head 2 via a control valve 3. The engine 1 is provided with a hydraulically operated valve stop means 5 having a hydraulic chamber 4 in which the valves 6 of the intake and exhaust system of the engine 1 can be freely selected into a rest state in which they are not driven by the valve cam 7. To explain this in detail with reference to the illustrated example, the stop means 5 includes a rocker arm 8a on one side that engages with the valve cam 7 and a rocker arm 8a that engages with the valve cam 7, as shown clearly in FIGS. 3 and 4, for example. It consists of a shift pin extending between the rocker arm 8b on the other side that does not match, and when pressure oil is introduced into the hydraulic chamber 4, the shift pin is pushed forward by the pressure oil and moves as shown in the third figure, for example. Both lock arms 8a, 8b
However, according to the derivation of the pressure oil, for example, as shown in the fourth figure, the spring 5 is connected to the spring 5 through the cushion pin.
a moves backward and both rocker arms 8a, 8
b acts to separate them from each other. Furthermore, the control valve 3 is of a type having a spool valve 10 that is slidable inside a longitudinally extending cylindrical valve housing 9, and is fixed to the rear of the cylinder head 2. do. The spool valve 10 is slidably switched between one direction by a spring 11 and the other by an actuating solenoid 12, and an accumulator 13 is provided on the side thereof substantially parallel to the spool valve 10.

Although the above is not particularly different from the conventional one, according to the present invention, for example, as clearly shown in FIG. It can be installed in an inclined position with a slight incline in the vertical direction. In this case, the angle of inclination in the vertical direction is preferably about 25 degrees. In the illustrated example, the control valve 3 is provided so as to be offset to the right in the drawing so as to be at an upper position in the direction of inclination of the vehicle body when the side stand is used.

Above, an example has been described in which the present invention is implemented in an operation control valve device of a valve stop means, but it can also be implemented in an operation control valve device in which the rocker arms of a pair of valves with different lifts are mutually engaged and disengaged. can.

In this way, according to the present invention, the control valve is installed in a position that is slightly tilted in the vertical direction from the horizontal position in the left-right direction parallel to the engine crankshaft in its longitudinally extending valve housing, and the internal spool valve This eliminates the need to make the spring or the like particularly large in order to protect it from inadvertent operation, and has the effect of being relatively compact as a whole.

[Brief explanation of the drawing]

Figure 1 is a partially cutaway plan view of the conventional example;
The figure is a partially cutaway side view of an example of the device of the present invention;
3 and 4 are partially cutaway plan views of each operating state, and FIG. 5 is a rear view thereof. 1...Engine, 2...Cylinder head, 3...
...Control valve, 4...Hydraulic chamber, 5...Valve stop means, 9...Valve housing, 10...Spool valve.

Claims (1)

[Claims] 1. A hydraulically actuated variable valve actuation means having a hydraulic chamber into which pressure oil is introduced and extracted through a control valve is provided in the cylinder head at the top of the engine to switch the operating state of the valves in the intake and exhaust system of the engine. The control valve is of a type in which a spool valve is provided in a longitudinally extending cylindrical valve housing so as to be slidable along the spool valve. An operation control valve device for a variable valve operation means for an engine, characterized in that it is installed in an inclined position slightly tilted in the vertical direction from a horizontal position in the left-right direction substantially parallel to the crankshaft.