JPS6114406A - Variable cylinder controller for internal-combustion engine - Google Patents

Abstract

PURPOSE:To secure such a valve stopping mechanism as being applicable irrespective of constitution in a valve gear system between a cam and a combined suction-and-exhaust valve, by operating a lock member, which allows or forbids a relative turning motion between the cam and a cam shaft, with fluid pressure. CONSTITUTION:Cams 33 and 34 opening or closing a combined suction-and-exhaust valve 14 is installed in a hollow cam shaft 10 free of relative rotation, while a guide groove 31 is installed in an inner surface to come into contact with an outer surface of the cam shaft 10. A lock member 29, whose one end is projectable to the inside of the guide groove 31 and other end hits a cam surface 27 of a plunger 23, is installed in the cam shaft 10 free of movement in a radial direction. The plunger 23 moves in the axial direction of the cam shaft in response to motion of pressure oil to be fed to a hollow part of the cam shaft 10 whereby the lock member 29 is operated through the cam surface 27, and when the lock member 29 hits a shoulder 32 of the groove 31, the valve 14 is opened or closed as well as when the lock member 29 is separated from the groove 31, operation of the valve 14 is stopped.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention provides a quad shaft rotated by an internal combustion engine, a cam interlocked with the cam shaft, and a core cam that is opened and closed by rotation. Related to a variable cylinder control device for an internal combustion engine that has an intake and exhaust valve and that stops the operation of the intake and exhaust valve depending on the driving condition of the vehicle to perform cylinder reduction operation to improve fuel efficiency (prior technology) As a prior art, the one described in Japanese Utility Model Application Publication No. 58-87941 is already known. This one is biased by a spring on the one hand, and the operating pressure Q on the other hand.
A plunger that is biased in this way is arranged in a rocker arm that is engaged with a cam at one end and swings, and a stopper that is interlocked with this plunger is arranged at the other end of the rocker arm and interlocked with the supply + Jl air valve. The rocker arm and the intake/exhaust valve can be linked via the connecting member, or the rocker arm can be idled relative to the connecting member to stop the operation of the intake/exhaust valve, and the engine's variable cylinder It is for controlling.

(Problems to be Solved by the Invention) In the above-mentioned conventional device, a plunger, a stopper, a connecting member, etc. for variable cylinder control are arranged inside the rocker arm, and in particular, the plunger, stopper, connecting member, etc. are arranged in the rocker arm, and in particular, the lift amount of the cam is absorbed and supplied. In order to deactivate the exhaust valve, a connecting member that allows idle operation is required between the cam and the supply/exhaust valve. Therefore, there is a problem that it cannot be applied to a direct type in which the operation of the cam is directly transmitted to the supply and exhaust valves.

Therefore, an object of the present invention is to achieve the cylinder reduction function by stopping the rotation of the cam itself, and to eliminate the need for a special connecting member between the cam and the intake/exhaust valve.

[Structure of the invention]

(Means for Solving the Problems) The present invention is a camshaft that is slidably disposed within a camshaft, is biased in one direction by a spring, and biased in the other direction by selectively supplied fluid pressure. a plunger formed on the plunger, a cam surface formed on the plunger, a first member disposed to be engageable with the cam surface and interlocking the camshaft and the cam;
The locking member is movable between the first position and the second position that allows relative rotation between the cam shirt 1 and the cam.

(Function) In the present invention, when the lock member is in the first position, the rotation of the camshaft is transmitted to the cam and the supply and exhaust valves are activated, and when the lock member is in the second position, the rotation of the camshaft is transmitted to the cam and the intake and exhaust valves are activated. , cam shirt rotates, but the cam does not rotate, so the operation of the supply and exhaust valves is stopped. Therefore, there is no need for a special member between the cam and the supply/exhaust valve to transmit the operation of the cam to the supply/exhaust valve or to disconnect the valve, and the system can be applied to various types.

(Example) Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

a camshaft 10 rotated by an internal combustion engine;
The cam 11, which is normally rotated integrally, opens and closes the supply and exhaust valves 14 via the valve lifter 13, as shown in FIG. The supply/exhaust valve 14 is connected via a guide member 15 that is press-fitted into the engine block.

The stem 1G has a stem 1G that is movably supported, and the upper end of the stem 16 is in contact with the lid 13. stem 16
One end is locked to a retainer 18 that is fixedly attached to the stem 16 via a J-shaped stud 17 near the upper end,
A spring I9, whose other end is locked to the engine block, constantly urges the valve I4 upward. Then, cam 11
The supply/exhaust valve 14 is opened and closed via the lick 13 as the valve rotates.

As clearly shown in FIGS. 1 and 2, a hole 21 with one end open is formed in the camshaft 10 which is arranged integrally with the drive pulley 20 and rotates. ．． A second plunger 22,23 is slidably arranged in series. Both plungers 22 and 23 are urged to the right in the figure by a spring 2G, and under normal conditions, the second plunger l-2
3 is regulated by a pin 29 which will be described later.
in position. The second plunger 23 has a camshaft 1
0, a long hole 25 is formed to receive the pin 724. It has the function of a stopper when operated to the second position shown in FIG. A cam tapered surface 27 is formed at the right end of the second plunger 23 that comes into contact with the first plunger 22, and one end of the pin 29 of the lock portion 4A', J:l, is engaged with the cam surface 27 by a spring 28. It matches. Since the second plunger 23 is prevented from rotating relative to the camshaft 10 by the pin 24, the pin 29 and the cam tapered surface 27 will not be out of phase. The other end of the pin 29 extends into a guide groove 31 formed in the cam 11 through a hole 30 of the camshaft 1o, and engages with a shield portion 32 of m31 as shown in the third figure. Therefore, when the pin 29 is in the first position shown in FIG. 1.3, the cam 11 rotates in conjunction with the rotation of the camshaft 1o. Guide $
Since 31 is formed on the end face of the cam 11, it can be easily formed by cold forging, sintering, etc. G on cam 11,
1st. A second cam surface 33,34 is formed, each cam surface 33
．． 34 are respectively engaged with two interlocking hull lifters,
It is possible to simultaneously control two 1/1 air supply valves for multiple cylinders of a vehicle.

At the right end of the first plunger 22, there is an oil passage 35. formed in the cam shirts 1 to 10. The oil passage 3 formed in the cam journal 3 () is connected to a hydraulic system in which hydraulic pressure is supplied from a hydraulic pressure source 39 through two pipes 37 and 38, or the solenoid valve 38 is normally closed. position, to the right of the first plunger 22!
Hydraulic pressure is not supplied to 1!6i. Therefore, both plungers 22, 23 . The pin 29 is in the first position in FIGS. 1 and 3, and the rotation of the shaft 10 is transmitted to the cam 11 via the pin 29, and the supply/exhaust valve 4 is operated. When the solenoid valve 38 is opened in response to a signal from the computer 40 that detects the operating state of the vehicle, hydraulic pressure is supplied to the right end of the first plunger 22 via the oil passage described above, and both plungers 2
2.23 moves to the second position -5 shown in FIGS. The line 11 is removed from the guide/g31 of the cam 11 by the ring 28, and the holes 30 of the cam shirts 1 to 10
To be located inside and move. Therefore, Kamunyahu I.
10 and the cam 11 are allowed to rotate relative to each other, the rotation of the camshaft 10 is not transmitted to the force l, 1], and the operation of the supply/exhaust valve 14 is stopped. The hydraulic oil applied to the right end of the first plunger 22 is relieved by a well-known return passage when the solenoid valve 38 is closed.
What leaks into the hole 21 of the cam shirt I-10 is discharged through the tJl outlet [l4l formed in the cam shirt 1-10. 42 is force J, journal, 43
1.04 is a hole for mounting the pin 29 formed on the camshaft, and 44 is a ring "C". When the pin 29 and the cam 1 engage with the hub brick 13 at its base circle, the pin The force applied to 29 is reduced or eliminated and is moved by the spring to the second position i.The first plunger 2
2 is a snap link or camshaft opening 1 as appropriate.
"Movement to the right may be restricted by a bolt for the pulley 20 that is screwed into the inner circumferential screws 4 and 5 on the end side,
In any case, when the plunger 22 is in the first illustrated position, the supply of hydraulic oil to its right end via the oil passage 35 is ensured (114).

The operating pressure source for moving the plunger against the spring is not necessarily hydraulic pressure, but may be air, vacuum, etc., and the pin 29 as a link part
Plunge 8. is used for mounting the 1st. Although it is divided into second plungers 22 and 23, it does not necessarily have to be divided.

Since the hydraulic pressure path is disposed close to the open end of the cam shirt 1-10, the first plunger 2 receives the hydraulic pressure.
Drilling of the sliding hole 21 in No. 2 becomes easier, and the accuracy is improved, and even if an oil leak occurs due to a failure in the hydraulic pressure path, the plunger will return to the first position by the spring, so all cylinders will be safely drilled. You can go back to driving.

(Effects of the Invention) As described above, the present invention performs variable cylinder control of the engine by transmitting and cutting off the rotation of the camshaft to the cam. It can be applied regardless of the type of valve mechanism between air valves. In addition, it is compact because the variable cylinder control member can be built into the power supply valve I, and unlike the prior art described above, there is no need to dispose the swinging member JJ leading to the supply υ1 air valve. There is no increase in the inertial mass of the valve train, and there is no decrease in the engine's maximum rotational speed.

[Brief explanation of the drawing]

Fig. 1 shows an embodiment of the present invention, in which a cam and a camshaft are shown in an interlocking state, Fig. 2 is a diagram showing a non-interlocking state of the cam and camshaft in Fig. 1, and Figs. 3 and 4. is the first one with a valve mechanism added. l1l-nl line in Figure 2, IV-T
The figures seen from the V line are not shown. 10...Camshaft, 11...Cam, 14...
Supply/exhaust valve, 22.23... Plunger, 27... Cam surface, 29... Pin ([cock part (wa, 35.36'
, 37...Oil passage, 38...Solenoid valve, 39...Hydraulic pressure source Fig. 3 Fig. 4

Claims (1)

[Claims] It has a camshaft that is rotated by an internal combustion engine, a cam that interlocks with the camshaft, and an intake and exhaust valve that is opened and closed by the rotation of the cam. a plunger that is biased in one direction and biased in the other direction by fluid pressure that is selectively supplied; a cam surface formed on the plunger; A variable cylinder control device for an internal combustion engine, comprising a lock member movable between a first position for interlocking the camshaft and the cam and a second position for allowing relative rotation between the camshaft and the cam.