JPS5910717A - Control device for valve shut-down mechanism in internal-combustion engine - Google Patents

Abstract

PURPOSE:To prevent the erroneous operation of a valve shut-down mechanism, by installing a lock mechanism, in case of a device suspending suction and exhaust valves in time of partial cylinder operation in a multicylinder engine. CONSTITUTION:A rocker arm 9 provided with a forklike end part 13 is rotated by a solenoid 21, installing a rotor 11 provided with small projections 12a and 12b at the side in a valve extension part rotatably and transmitting movements of the solenoid 21 to a lever 60. At the valve operating area, the forklike end part 13 is engaged with these small projections 12a and 12b... while at the shut- down position, the forklike end part is released from these small projections 12a and 12b. A latch 74 of a stopper 71 is made up so as to engage with a slit 731 on a rock plate 73, and unless the solenoid 21 operates when a valve shut- down mechanism is in the valve on-off position, the valve shut-down mechanism is designed so as to be unnecessarily operated by any other external force, thereby improving the operating reliability yet higher.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a multi-cylinder internal combustion engine which performs partial cylinder operation by cutting off the fuel supply to some cylinder groups according to the engine load. This invention relates to a device for arbitrarily stopping the intake valves and exhaust valves of a group of cylinders.

When the engine is under light load, one of the intake and exhaust valves of some cylinders, and in some cases both the intake and exhaust valves, are kept fully open to eliminate pumping work for the idle cylinders, thereby improving the thermal efficiency of the engine.

Further, by preventing air from flowing into the exhaust system from the idle cylinders, overcooling of the catalyst device provided in the exhaust system can be prevented, thereby preventing a decrease in the exhaust purification efficiency of the catalyst.

The present inventor has previously proposed a valve stop mechanism that arbitrarily stops the intake and exhaust valves during such cylinder reduction operation. (Refer to Utility Application No. 57-57839, Japanese Patent Application No. 57-44649, etc.) The above-mentioned valve stop mechanism proposed by the present inventor has a structure as shown in Figs. 1, an exhaust valve 5 for opening and closing the exhaust port 4 is attached, and the exhaust valve 5 is biased in the valve closing direction by a pulp spring 7, and is driven by a rocker arm 9. There is. The rocker arm 9 follows the cam 10 and moves up and down using a pizzet 8 screwed onto the cylinder head 1 as a fulcrum. Exhaust valve 5 valve! +1] 6 has its tip extended upward compared to the conventional product, and the rotor 11 is rotatably covered by the extended portion. As shown in FIG. 2, a pair of small protrusions 12a and 12b are provided on the surface 12 of the rotor 1117) 11I11 in the diametrical direction. Fork-shaped pawls L3a and 13b are formed. The claw 13g, J, 3b open gap v"
- The pawl 13a is slightly larger than the diameter of the upper cylindrical portion of the rotor 11. When the rotor 11 rotates 900 times from the state shown in FIG.
, 13b, sandwich the part between 13I4, 13
The distance between b corresponds to the distance between the small protrusions 12a and 12b, and when the rotor 11 is in the position shown in FIG.
3b is the small protrusion 12a.

It is possible to contact the soil surface of 12b. The lower spring 15 is wound around the cylindrical support shaft 16 near the fulcrum of the rocker arm 9, and one of its action points engages the rocker arm 9 so as to press it against the cam 1.0 (=J force).

A bottle 17 is fixed to one end of the flange 14 of the mouth-to-face 11 parallel to the valve shaft 6, and a lever 19 is connected to the bottle 17 through a sleeve 18 so as to be slidable in the axial direction of the bottle 17. Le-*-1
9 has a flexibility of 4 degrees, and the middle part of the lever is 2 o.
The thin end of the guide 19 is connected to the operating shaft 22 of the electromagnetic solenoid 21.

As shown in Figure 2, 1, there are 12 small protrusions on the rotor 11.

Rocker arm 9 fits 13a on the soil surface of 12b.

When 13b is in contact, the rotor 11 moves up and down due to the up and down movement of the rocker arm 9 due to the rotation of the cam 1o, and the exhaust valve 5 is opened and closed accordingly. Next, electromagnetic solenoid 2
1 is energized and the action @22 moves in a direction perpendicular to the paper surface of FIG. 1, the lever 19 swings with the bottle 20 as a fulcrum,
Rotating force acts on the bottle 17 connected to the tip of the valve 19, causing the rotor 11 to rotate around the valve shaft 6. In this way, the positions of the small protrusions 12a and 12b of the opening 11 are changed so that they no longer come into contact with the pawls 13a and i3b, so even if the rocker arm 9 moves up and down as the cam 10 rotates, the force of the rocker arm 9 is transferred to the rotor. 11 and the exhaust valve 5 will not open or close. Furthermore, due to the biasing force of the IJ song 5, the pawl 13a of the rocker arm 9
VC between 13b and the small protrusion 12m of the rotor 11,] 2b is always in contact with the acupuncture needle when the cam 1o is not acting (when the pace circle of the cam 1() is in contact with the rocker arm 9). A clearance is generated, allowing the rotor 11 to rotate freely. The spring 3o also prevents the rotor 11 from floating away from the tip of the valve shaft 6 due to engine vibrations or the like.

And the above-mentioned claws 13a, 13b and small protrusion 128.1
2b is essential for the rotor 11 to rotate freely due to external force when the valve opening force by the cam 1° is not transmitted to the rocker arm 9, and this clearance is essential for the engine. It is necessary to make appropriate adjustments depending on usage conditions, operating conditions, etc. The configuration of this clearance adjustment mechanism is as shown in FIG. 3. A screw hole 42 that coincides with the axis of the valve shaft 6 is provided in the top cylindrical portion 11' of the rotor 11, and an adjustment screw 41 is screwed into the screw hole 42. the screw 41 into the lock nut 40 and the rotor 1 so that its tip touches the top end of the valve stem 6.
641', which is prevented from rotating relative to 1, is screw 4.
10 is a groove for inserting a driver provided at the top end. When adjusting the clearance, adjust the adjustment
By rotating rotor 1 relative to rotor IIK, rotor 1
1 is a small protrusion 12a of the rotor 11 that moves up and down along the valve shaft 6.

The clearance between 12b and the pawls 13a, 13b of the rocker arm 9 is adjusted to a desired size.

The valve stop mechanism configured as described above is attached to each of the pair of intake valves and exhaust valves of one cylinder, and in order to control these valve stop mechanisms simultaneously, the valve stop mechanism is configured as shown in FIG. 4, for example.

On the intake valve (not shown) side, a rotor 51 having a pair of small protrusions 52a, 52b and a pin 41 having the same structure as the exhaust valve 5 side is fitted onto the valve shaft (not shown), and the rotor 51 is fitted onto the valve shaft (not shown). 1
1 and the rotor 51, respectively, are provided with levers 60 and 61 for transmitting the driving force of the electromagnetic solenoid 21. Each lever 6
0.61 has pivots 62 and 63 fixed on the fuselage as the center of swing, and one end of each is connected by a rod 66 via a connection point 64, 65, and the other end is formed into a fork shape. Each pin 17, 41 fixed to the rotor 11, 51 is clamped by the fork part. Electromagnetic solenoid/action of noid 21←
1122 is the middle of 1/.-60++1! Also fixed to the fork-shaped arno, 67 picks 1. A groove is formed on the arm 67, and the operating shaft 22 and the arm 67 are connected through this groove, and the driving force generated in the electromagnetic solenoid 21 is transmitted through the operating shaft 22 and the arm 67 to 60, and is further transmitted to ry2 and 2-61 through the ry2 drawer 6, and the rotor 11.5 rotates at the same time, so that both the intake valve and the exhaust valve are at the rest position.

Therefore, according to the valve stop mechanism having such a configuration, the rotors 11, 51 are
Since rotation is stopped only by the force of the return spring 47 of the operating shaft 22 of the electromagnetic solenoid 21, vibrations from the engine or the pulp driving force of the rocker a = 1.9 are applied to the rotors 11, 5.
It is conceivable that the rotor i1.51 may rotate against the intention of the valve stop mechanism by applying a rotational moment to the valve stop mechanism.

When fixing the Azo Yast screw 41 for rearance adjustment on the head of the rotor 11.51 as shown in Figs. 1 and 3 and fixing it to the rotor 11, 51 with the lock nut 40, A jig is required to stop the rotation of the rotors 11, 51 when tightening or loosening.

Therefore, based on the above two points, the valve stop mechanism shown in Figs.
It is required that the rotation be performed only when driven by 1.

The present invention has been developed to solve the above-mentioned problems, and its purpose is to improve the internal combustion engine.
When the valve is in the opening/closing state in the valve stop mechanism,
Unless the actuator that drives the valve stop mechanism is operated, the valve stop mechanism will be held in its position to prevent it from operating unnecessarily due to other external forces, and the valve stop mechanism will not operate due to engine vibration or the valve opening/closing drive generated by the cam. The purpose of this invention is to prevent malfunctions due to force, etc., and improve the reliability of the operation.

In order to achieve this object, the present invention has a fork-shaped end that follows the cam, and has a rocker arm that is erroneously moved, a small protrusion that faces each other on the side, and an extension of the valve stem. the fork-shaped The rotor is rotatable between a valve actuating position where the end engages with the front small protrusion and a valve body normal position where the fork-like end is disengaged from the small protrusion. In the valve stop mechanism, a mechanism for locking the lever is provided, and when the valve stop mechanism is in the valve operation position, the lever is locked so that the rotor is not rotated by an external force other than the actuator. It is characterized by the following.

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

5 to 7 show embodiments of the present invention.
4. Parts that do not have the same functions as those of the apparatus shown in FIGS. 4 to 4 are indicated using the same reference numerals, so a detailed explanation of these parts will be omitted, and only the parts that characterize the present invention will be described.

As shown in FIGS. 5 and 6, the lever 60 that transmits the driving force of the electromagnetic solenoid 021 to the rotor 11 swings about a pivot 62 fixed to the fuselage, and has a slit 70 at one end. A pin 17 fixed to the rotor 11 is held by the slit 70. Furthermore, the lever 60 has a pivot 6
A pin 72 is fixed between 2 and the slit 70, and a lock horn or 76 is erected along one side of the trench. A stop 971 is fixed to the fuselage and has a latch 74 in a part thereof. This Stotsuno J-71 has lever 6
This is to restrict the position of the lever 60 when the lever 60 is in the 0 position and is in the valve opening/closing operating position, as will be described later.

The lock plate 73 is placed on the lever 60, and the pin 72 fixed on the lever 60 is inserted into the insertion hole 732 provided in the lock plate 73, so that the lock plate 73 is inserted into the pin 7.
Rotate using 2 as an axis. Furthermore, a lock slit 731 is provided around the lock plate 73, and the latch 74 provided on the stop P71 is connected to the lock slit 731. The lock plate 73 is rotated clockwise so that the lock plate 73 locks with the right side 761 of the opening 1.Cust, So. A circular arc portion 734 is formed at the opening, and by rotating the cup plate 730 counterclockwise, this circular arc portion 7
34 is the lock stock/s? 76 so as to come into contact with the inner wall 762 of 76. In addition, a pin 77 is fixed to the base plate 73. An arm 67 for transmitting the driving force of the electromagnetic solenoid 21 to the lever 60 is placed on the lever 60. The arm 67 has an L-shaped cross section, and one end of the horizontal portion of the arm 67 is pivotally connected to a pivot 62, which is the center of movement of the lever 6(). Install it so that it swings as if A slit 78 is provided at the other end of the horizontal portion of the arm 67, and a pin 77 fixed on the front fiEE lock plate 73 is inserted into the slit within 7 days.
is held. Further, a slit 68 is provided in the vertical portion of the arm 67, and this slit 68 and the electromagnetic solenoid 21
0 engages with the groove at the tip of the action shaft 22. Furthermore, a crank lever 79 is protruded from the terminal 67, which is connected to the brake lever 79 and combines the driving force of the electromagnetic solenoid 21 with the brake lever 79. 66
to the other valve stop mechanism.

A spring 75 is wound around a pin 72 fixed to the k%-v R-60, one end of which is locked to a lock plate 73, and the other end is a lock installed upright on the R-60). - It is locked in a locking groove 763 provided in a part of the shaft 76, and is biased to apply rotational force in one direction to the lock plate 73.

The operation of this embodiment having the above configuration is as follows.

The state shown in FIG. 5 shows the valve opening/closing operating position, and the lock plate 73 (lock 'Jv) 731 is engaged with the latch 74 of the lock plate 73 and the rotational moment generated by engine vibration or the valve driving force of the rocker arm 9, etc. ↓Prevent Rerotor 11 from naturally [dIlliIl! To i-
I'm here.

When the engine shifts to light load operation from this state, it is determined that the relevant cylinder is in rest operation, and the city control unit shown in the figure is activated.
4E Ml (One streetcar is applied to solenoid 21. The magnetic force generated in the electric and magnetic solenoid 21 attracts the action shaft 22 toward the electromagnetic solenoid 21 and rotates the arm 67. The arm 67 rotates clockwise around the pivot 62. The pin 77 rotates in the direction and engages with the slit 78.Pin 7
The driving force applied to the lock grating 7 directly becomes a rotational force of the lock grating 73, and the lock grating 73 rotates counterclockwise around the pin 72, overcoming the biasing force of the spring 75. Instead, the lock slit 731 of the lock plate 73 separates from the latch 74 of the stop 71. On the other hand, since the opening and the locking stock 76 are erected in the lock plate 73, the circular arc portion 734 at the left end of the lock plate 73
comes into contact with the inner wall 734 of the lock stock 76 and its rotation is restricted, and the lock plate 73 only rotates by an angle necessary for the lock slit 731 to disengage from the latch 74, and thereafter the rotation of the arm 67 is restricted. The first part of the movement is transmitted to the lever 60, which rotates the rotor 11 to a predetermined position, stopping the opening and closing operation of the valve and bringing it into the closed ifO state.

Next, when the engine is in a high load state, the electronic control unit determines the necessity of operating the idle cylinder and cuts off the power to the electromagnetic solenoid 21, as in the case described above. As a result, the arm 67 is restrained from rotating clockwise, and the return spring 80 (see FIG. 5), which urges the rear arm 7, causes the Reno J-60 to begin rotating counterclockwise. At this time, the lock plate 73 is rotated clockwise relative to the lever 60 by the spring 75, but the engagement LL portion 733 at the right end is
Right side 7 of lock horn 976 installed on j-60
61 from the outside on the right side, it tends to rotate more than necessary. In this state, the lock plate 73 is stopped)97
When the lever 60 rotates until it hits 1K, the lock slit 731 is inserted and engaged with the side 74. In this way, the lever 60 returns to the position shown in FIG. 5 again and operates to open and close the valve.

Figure 71. FIG. 8 shows the valve stop mechanism and control (2) device applied to the valves on different sides. This figure shows the lever 60 in an intermediate position.

In FIG. 8, reference numeral 82 denotes a support portion H of the control unit, and the return spring 80 has one end locked to the lever 60 and the other end fixed to the support member 82 through the lever 1-1 and the lever 60. The rotor 11 is used in the valve opening/closing operation side. 81i is a plate spring that biases the collar 14 of the rotor 11 to prevent the rotor 11 from floating up, and the rocker arm 9 engages 13a especially when the rotor 11 rotates.

Avoid contact between t3b and the small protrusions 12a and 12b of the rotor 11. Numeral 83 is an adjustment screw, and 84 is a lock nut, which are used to adjust so that a predetermined clearance is obtained between the pawls 13g, 13b and the small protrusions 12a, 12b.

When tightening or loosening the lock nut 84, the adjuster can tighten the lock nut 84 without using a jig to prevent the rotation of the rotor 11, since the lever 60 is locked in the valve opening/closing operating position. You can easily work by simply rotating the

As explained above, the present invention is provided with a locking mechanism in the valve stop mechanism that acts to switch between the valve opening/closing operating position and the valve body normal position. As long as the actuator that drives the valve stop mechanism is fully operated when it is in the operating position, the valve stop mechanism is prevented from operating unnecessarily by other external forces and maintains its position. This prevents malfunction and improves the reliability of its operation. Also, when adjusting the adjuster toss free, which adjusts the clearance between the rocker arm and rotor in the valve stop mechanism, using a special jig allows you to easily adjust it by simply rotating the lock nut. It has the excellent effect of being able to do a lot of things.

[Brief explanation of the drawing]

Figures 1 to 4 show a valve stop mechanism proposed by the inventor before this application, Figure 1 is a longitudinal sectional view thereof, Figure 2 is a perspective view of the main parts of the same mechanism, and Figure 3 is a Fig. 1 is a sectional view taken along line i1, Fig. 4 is a plan view showing an application example in which the mechanism shown in Fig. 1 is used in a pair of intake and exhaust valves. A plan view, Figure 6 is an enlarged exploded perspective view showing the main parts of the above embodiment, Figure 7 is a plan view showing an example in which the above embodiment is applied to a valve on the side of the boundary, and Figure 8 is a diagram showing the tooth of mark 7. 1-11 is a vertical cross-sectional view taken along line 1-11. FIG. 5...Exhaust valve, 6 Valve shaft, 9...Lop i-arl1,
]0...Cam, ti, 51...Rotor, 12g
, 12b. 52a, 52b-small protrusion, 13a, 13b middle claw, 40
...Lock nut, 41...Asiastos, Kuriyu, 60...Lever, 67...Arm, 68,70°78...Slit, 71...St, ノ'', 72177
... Pin, 73 ... Lock plate, 731 ... Lock slit, 733 ... Locking part, 734 ... Arc part, 74 ... Latch, 76 ... Lock stopper. Figure 1 5 Figure 4 Figure 5

Claims (1)

[Claims] ■. A rocker arm having a fork-shaped end and swinging in accordance with the cam, and a rocker arm having opposing small protrusions on the side surface and rotatably mounted on an extension of the valve shaft. A valve comprising a fitted rotor, an actuator serving as a driving source for rotating the rotor, and a lever transmitting the driving force of the actuator to the rotor, the fork-shaped end engaging the small protrusion. An internal combustion engine 4 in which the rotor is rotatable between an operating position and a normal position of the valve body in which the fork-shaped end portion is separated from the small protrusion.
12 (7) In the valve stop mechanism, a mechanism for locking the lever is provided, and when the valve stop mechanism is in a valve operating position, the lever is locked so that the rotor is rotated by an external force other than the actuator. A control device for a valve stop mechanism, characterized in that: 2. The locking mechanism of the lever rotates around the stopper fixed to the aircraft body and the stopper fixed on the front lever, and engages and disengages with the stopper and the stopper fixed to the front lever. a lock plate having a portion that locks and releases from the outside of the lock stopper installed on the lever, and a portion that locks and releases from the inside of the lock stopper; and an arm that engages with a pin fixed to the actuator, the other end of which is pivotally connected to the swing center of the actuator, and a portion of which is connected to the operating shaft of the actuator. 2. A control device for a valve stop mechanism for an internal combustion engine according to claim 1.