JPS59162307A - Valve stop device - Google Patents

Abstract

PURPOSE:To lessen increase of mass of a dynamic valve system as well as quicken the selecting operation of a valve stop device, by incorporating such an arrangement that the cam is fixed or given rotatability with respect to the cam shaft. CONSTITUTION:A cam 11 having a cylindrical extension part 10 stretching in the direction of cam shaft is fitted on a cam shaft 2 rotatably, and this cylindrical extension part 10 is supported by a bearing B. A plunger 25 is fitted on this cam shaft 2 slidably and makes intrusion or retraction into/from a detent hole 22 provided in the cam 11 in compliance with the oil pressure supplied to a groove 14, which is formed in the ring-shaped interior wall 12 of said bearing B so as to fix or provide rotatability for the cam 11 with respect to the cam shaft 2. According to this arrangement only additional provision of a plunger 25 for the dynamic valve system will give comparatively small mass of the system, which can facilitate high-speed operation.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for stopping the supply and exhaust valves of an internal combustion engine, and particularly a valve 1 capable of cutting valve operating force between a cam and a camshaft in a valve train.・Regarding positive pressure equipment.

A vehicle equipped with an internal combustion lap engine does not require a significant amount of output when driving steadily on a flat road, driving under a light load such as driving at low speed in a city area, or when running at full speed. In such cases, an internal combustion engine is necessary.

All you have to do is ignite the small fuel and sustain the drive.
Both the amount of air supply and fuel are kept low. especially.

In the case of a two-valve internal combustion engine, such as one equipped with two intake valves and two exhaust valves, at low output, the diameter is relatively small.
There is a known system that uses a swirl-prone air supply boat in which only a closed air supply valve and one exhaust valve are operated, and all four valves are operated at high output. Furthermore, in the case of multi-cylinder engines/
As disclosed in the April 2007 issue 5 New Mechanism Explanation, the rocker arms of some of the cylinders in the multiple /s/das are undone, the valves are kept completely idle, and output generation is stopped. There are also known vehicles that perform cylinder operation under light loads and maintain steady running. All of these internal combustion engines can reduce wasteful fuel consumption and increase fuel efficiency, but it is necessary to install a valve stop device in the valve train, and the valve train is more efficient than a normal internal combustion engine. This becomes complicated, and in particular, the mass of the drive section of the valve train increases, which tends to cause an increase in inertia.

The present invention can suppress the increase in mass of the valve train to a low level,
Another object of the present invention is to provide a valve stop device that does not cause a delay in switching between valve operation and non-stop operation.

A valve 1 stop device according to the present invention includes a camshaft of a valve system of an internal combustion engine, a cam fitted externally to the camshaft and formed with a cylindrical extension, and a bearing that pivotally supports the cylindrical extension. A planosha that can enter and retreat into the locking hole of the cylindrical elongated part, a groove formed in the annular inner wall of the bearing part, and hydraulic pressure transmitted to this groove is applied to the plunger, and when the plunger is not stopped, the plunger It is characterized in that it is made to retreat from the locking hole.

The present invention will be explained below with reference to the accompanying drawings.

Figure 1 shows a valve stop device Wl as a practical example of the present invention. This valve stop device is a multi-cylinder gaff IJ engine (not shown) that performs normal operation and cylinder operation in a timely manner.
It is attached to one cylinder (here, only one cylinder is used, but it can be attached to multiple cylinders in the same way). In addition,
In the valve train of this engine, a camshaft 2 that rotates at half the engine speed is pivotally mounted on a nodal head 3, and a rocker arm for the intake valve is installed parallel to the camshaft 2. It exhibits an overhead valve structure in which an air supply valve and an exhaust valve 7 (not shown) are operated through rocker arms 6 attached to a shaft 4 (see Figure 2) and an exhaust valve rocker arm shaft 5, respectively.

Here, the valve stop device l is used to control the air supply valve (
Since the exhaust valve 7 (not shown) and the exhaust valve 7 are operated in the same manner and have the same structure, the following description will mainly focus on the valve operating system on the exhaust valve 7 side.

The camshaft 2 is pivotally connected to a bearing part B, which is made up of a mounting base 8 on the cylinder head 3 and a cam cap 9 bolted to the mounting base, via a cylindrical extension part (hereinafter simply referred to as the cylindrical part) 10. Ru. The cylindrical portion 10 has a cylindrical shape extending from one side of the cam 11 in the camshaft 2 direction.

The bearing part B is formed with an annular inner wall surface 12 that comes into sliding contact with the cylindrical part IO, and a long groove 14 is formed in the annular inner wall surface of the bearing part B, as shown in FIG. Ru. It is connected to the oil field operating device OC via this groove 14 & oil passage 15 upward. This song king operation weapon is 2 + I through oil layer 16
Oil control pulp j3 grafted to t path 15
and an oil field circuit 17 connected thereto. The oil control valve 13 is a three-way solenoid valve, and is operated by an output signal from a controller 18 consisting of a microcomputer. During normal valve operation, the oil pump 19
The song from 7M is stored in the accumulator 420, and it is guided to the inflow boat 1-1.31, and when it is not stopped, oil is supplied via the operation boat 132 to the oil 'f;F 16 (I
Switching is performed to lead to ll. Note that the reference numeral 133 indicates a drain boat.

The cam 11 integrated with the cylindrical portion to has its base circle b (3
・The annular inner wall surface 21 has a shape F so that the center point of the cam shaft 2 (see Figure 2) coincides with the center line l of the camshaft 2, and the cylindrical portion 10 has a maximum lift position ff'l□a1 of the cam 11. The locking holes 22 are formed in alignment with a rotation angle of 180°. This locking hole 22 is located outside the annular inner wall surface 21.
It is formed as a hole that penetrates up to lil+, and inside
Except for the cylinder part 10 rotating around 11, this locking hole rotates around p.
In the 1θ range, it continues to face the °C groove 14. The camshaft 2 is formed with an internal curve 23 in the center, and has a centerline 1 that is perpendicular to the centerline l and can face the locking hole 22.
A hole 24 having a diameter of 1 is formed. The guide hole 24 and the locking hole 22 are formed to have the same inner diameter, and a substantially cylindrical plunger 25 is slidably fitted into the guide hole 24. This plunger pushes the protrusion 11 (biased tip 25) from the guide hole 24 into the retaining hole 22 by means of a compression spring 26 whose one end abuts against the bottom 201 of the guide hole 24. Moreover, the entire length of this plano jar is slightly shorter than the length of the guide hole 24, and it can be completely retreated into the guide hole.

In addition, as shown in Figure 1.1, the in-shaft oil passage 23 of the camshaft
is connected to the drain ilj+, and the fang 1 allows the oil that has lubricated the guide hole 24 and the plane shaft 25 to flow through the drain ilj+.
I'm letting it go.

The valve stop device 1 shown in Fig. 1 operates together with the operation of the engine. First, the controller 18 detects the engine rotation speed, negative and positive f of the engine, the gear position of the transmission, on/off of the clutch, etc. as the vehicle is running. Output signal only when oil control valve 1
3, and the other 1 samurai stops outputting the signal. R
1", and when the output signal stops, the oil control valve] 3 (located in the home position/) allows pressure oil to flow into boat 1.
It only leads to 31, and the same cannot be said for the concave groove 14.

Therefore, the plano shaft 25 receives only the elastic force of the spring 260, and its tip 25 projects into the medium facing the locking hole 22, thereby integrally connecting the camshaft 2, the cylindrical portion 10, and the cam 11. Rotates in rotation direction R. As a result, the exhaust valve 7 operates in a normal state, and at this time, the intake valve (not shown) also operates normally, and the cylinder provided with both valves generates an output. On the other hand, when the controller 18 issues an output signal,
Oil control valve 13 operates pressure oil boat 13
2 (indicated by the 1.φ chain line in Figure 1), the pressure oil reaches the concave groove 14 from the curve j11.5, and pushes the plunger 25 of the locking hole 22 opposite thereto. . In this case, the locking hole 22 into which the plunger 25 has entered is connected to the camshaft 20.
Every rotation, the blocker 27 without the groove 14 faces the blocker 27, but during this period (77'), the lift part a enters a lift operation to push up the rocker arm 6, so the blocker 27 stops the increase in hydraulic pressure and the rocker arm 6 is temporarily stopped, and the planar jar 25 is completely retracted into the guide hole 24 in the rotation angle θ region facing the groove I4 (see Figures 1 and 4). This prevents the cam 11 and the camshaft 2 from becoming thinner due to pressing the rocker arm 6 and keeping the exhaust valve 7 open.
There is. In this way, the camshaft 2 is rotated in the rotation direction R with respect to the cam 11.
When the engine rotates, the exhaust valve 7 and the air supply valve (not shown) also remain fully closed, and the 7 cylinder equipped with these valves enters cylinder operation in which output generation is stopped. Note that when the controller 18 stops the output again, the plunger 25 receives only the elastic force of the spring 260, and when its tip 251 faces the locking hole 22, it plunges into it, and the cam 11 and camshaft 2 rotate integrally. Then, the cylinder resumes normal operation capable of generating output.

By operating the valve stop device 1 at a predetermined time in this manner, the cylinder to which it is attached can perform normal operation and cylinder operation, and fuel consumption can be kept low. Moreover, this valve stop device does not increase the mass of the swinging end such as the rocker arm 6, but only adds the plano jar 25 inside the rotating camshaft 2, and the mass h'' of the valve system is relatively Small and easy to drive at high speed.Specially,
In the switching operation between the valve ('F-operation) and the valve stop position, even if the material in the guide hole 24 is discharged due to the centrifugal force caused by 20 rotations of the camshaft, it is replenished from the concave hole 414 to 1. ,
When the pressure oil is applied, the plunger 25 is delayed by 1 minute or enters the stop hole 22 at an inappropriate time, which prevents inconveniences such as temperature and humidity, and ensures accurate switching operation.
There is one.

The valve stop device 60 shown in Figure 1 operates the cam 11 that operates the exhaust valve 7, and the cam 11 (not shown) also operates the valve stop device (not shown).
(It was supposed to be operated separately, but instead of this, i' 5 "
As shown in Fig. 6, the cam 32 for operating the air supply valve 31 and the cam 33 for operating the exhaust valve 31 are integrated through the cylindrical portion 30 while maintaining a predetermined crossing angle α. Alternatively, a dual cam DC may be formed, this may be slidably fitted onto the camshaft 2, and the camshaft 2 and the dual cam DC may be connected and separated by a plunger 25. Also in this case,
The pressure oil that operates the sliding part 1 inside the planosha 25 and guide hole 24 can be operated using the same hydraulic system as explained in Figure 1.

In this case as well, the valve stop device f5? explained in the fI diagram? It has the same effect as l. In particular, one plunger can operate the cams for the supply and exhaust valves, reducing the number of parts.

In the above, the valve stop device l was explained as being used in the valve train of an engine capable of cylinder operation, but it can also be installed in the valve train of a 4-wheel engine (Lupue 7 engine), and can be used as a low-cost engine. It can also be used to increase supply and exhaust efficiency by operating only the air supply valve that opens and closes the air supply hole for increasing swirl during output, and operating two valves at a time for both supply and exhaust valves at high output.

[Brief explanation of the drawing]

Figure 11g+ is a schematic cross-sectional view of a valve stop device as an embodiment of the present invention, and Figures 1 and 2 are cross-sectional views taken along line X-X of Figure 1.
・Figure 3 is a Y-Y line toggle view of Figure 1, Figure 4 is a sectional view of the main part when the cam and camshaft are separated, and Figure 1'5 is a valve stop as another sister example of the present invention. Figures 3 and 6 are cross-sectional views of the main parts of the device, respectively showing the state in which the double cam and the opening arm are opposed to each other in Figure 5. 1... Valve stop device, 2... Camshaft, 1. (J...
Cylindrical part, 11°32.33...Cam, 12...Annular inner wall surface, 14...Concave bank, 22...Locking hole, 25...Planojar, B...Bearing part, OC・・・Hydraulic operating device,
R...Cam shaft rotation direction 7'F57 Illusion 48-

Claims (1)

[Claims] A camshaft in a valve train of an internal combustion engine, a cam fitted externally on the camshaft and having a cylindrical extension extending in the camshaft direction, and - pivotally supporting the cylindrical extension. a bearing part, a plunger which is movably fitted to the camshaft and capable of entering and retracting into a parallel hole passing through the cylindrical extension part; This valve stop device has a groove formed long in the direction, and a hydraulic pressure actuation device that applies hydraulic pressure in the groove to the granger and retreats the plunger from the locking hole when the plunger is not stopped.