JP6400525B2 - Variable valve mechanism for internal combustion engine - Google Patents

Description

  The present invention relates to a variable valve mechanism that drives a valve of each cylinder of a multi-cylinder internal combustion engine and changes a driving amount of the valve in accordance with an operation state.

  Among the variable valve mechanisms for a plurality of cylinders, the valves 7 and 7 are driven and the drive amount is continuously changed as in the variable valve mechanism 100 of the conventional example (Patent Document 1) shown in FIGS. Some continuously variable valve mechanisms 90, 90... Are changed for each cylinder of the internal combustion engine.

  Specifically, each continuously variable valve mechanism 90 is driven by a drive cam 99 to swing, an input arm 92 that swings together with the input arm 92, an output arm 94 that drives the valves 7 and 7, and an input arm 92. And an angle varying device 95 that continuously changes the angle of the swinging direction of the output arm 94 with respect to the angle.

JP 2001-263015 A

  However, in the conventional variable valve mechanism 100, the angle variable devices 95, 95,... Of all the continuously variable valve mechanisms 90, 90,. The drive amount of the valves 7 and 7 cannot be controlled (for each continuous variable valve mechanism 90). For this reason, even though it is possible to suspend valve driving for all cylinders at once, it is not possible to suspend valve driving (reduction of cylinders) with only some cylinders.

  Furthermore, in the variable valve mechanism 100 of the conventional example, there is a problem in the responsiveness between the pause and the return even when the valve driving is paused at the same time in all the cylinders. Because, since it is continuously variable, the valve drive amount must be continuously reduced to zero during a stop, and when the valve is restored, the zero valve drive amount is continuously reduced. This is because it must be increased and returned to the original valve drive amount, and it is difficult to quickly perform them.

  Accordingly, it is an object of the present invention to enable valve driving to be stopped (reduced) by only a part of a plurality of cylinders, and to improve responsiveness of valve driving to stop and return.

In order to achieve the above object, the variable valve mechanism for an internal combustion engine of the present invention includes a continuously variable valve mechanism for driving each valve and continuously changing the drive amount of each valve for each cylinder of the internal combustion engine. In the variable valve mechanism for a plurality of cylinders, a switching device is provided in one or more continuously variable valve mechanisms for switching between a pause state in which the drive of the valve is stopped and a drive state in which the valve is driven by releasing the pause. By configuring the switching for each part of the cylinders (that is, a plurality of cylinders excluding one or all), it is possible to pause only the valves of some cylinders while driving the valves of the other cylinders. A continuously variable valve mechanism provided with a switching device includes an input arm that is driven by a drive cam and swings, an intermediate arm that swings together with the input arm when connected to the input arm, and a valve that swings together with the intermediate arm. Driving And an angle varying device that continuously changes the angle of the swinging direction of the output arm with respect to the intermediate arm, and the switching device is driven by connecting the input arm and the intermediate arm, and the connection It is characterized by putting it into a dormant state by canceling .

The number of switching devices and the mode of switching are not particularly limited, but the following modes 1 to 3 are exemplified. However, the aspect 1 is most preferable because the valve can be stopped in all cylinders in addition to the valve stop (reducing cylinders) in some cylinders.
[1] A mode in which switching devices are provided in all continuously variable valve mechanisms, and the switching is performed for each of the switching devices.
[2] A mode in which a switching device is provided in some continuously variable valve mechanisms, and the switching is performed simultaneously for all of the provided switching devices.
[3] A mode in which a switching device is provided in some continuously variable valve mechanisms, and the switching is performed for each of some switching devices of the provided switching device.

  According to the present invention, the valve drive can be stopped (reduced) by only a part of the plurality of cylinders. Furthermore, the responsiveness of rest and return can be improved by switching the rest state and the drive state at once by using the switching device instead of continuously changing.

It is a perspective view which shows the variable valve mechanism with respect to the several cylinder of an Example. It is a perspective view which shows the continuous variable valve mechanism of an Example. It is a disassembled perspective view which shows the continuous variable valve mechanism of an Example. It is a perspective view which shows the continuously variable valve mechanism of an Example, and its periphery. It is a cross-sectional perspective view which shows the continuous variable valve mechanism of an Example. It is side surface sectional drawing which shows the continuous variable valve mechanism of an Example. a is a sectional view showing a driving state of the continuously variable valve mechanism of the embodiment, and b is a sectional view showing a resting state of the variable valve mechanism of the embodiment. It is a perspective view which shows the variable valve mechanism with respect to the multiple cylinders of a prior art example. It is a perspective view which shows the continuous variable valve mechanism of a prior art example.

As the aspect of the continuously variable valve mechanism provided with the switching device , the following aspects 1 and 2 can be shown, but the present invention adopts the aspect 2. In the first aspect, four types of arms (input arm, output arm, first input arm, and second output arm) are required, whereas in the second aspect, three types of arms (input arm, intermediate arm, and output arm) are required. The second embodiment is preferable in that it requires only an arm.

[1] A continuously variable valve mechanism that is provided with a switching device includes an input arm that is driven by a drive cam and swings, and an output arm that swings together with the input arm. And the angle variable apparatus which changes continuously the angle of the rocking | fluctuation direction of the output arm with respect to an input arm is provided. Furthermore, a second input arm that is driven by the output arm and swings and a second output arm that drives the valve when swinging are provided. And a switching device will be in a drive state by connecting a 2nd input arm and a 2nd output arm, and will be in a rest state by canceling | releasing the connection.

[2] A continuously variable valve mechanism provided with a switching device swings with an input arm that is driven by a drive cam and swings, an intermediate arm that swings with the input arm when connected to the input arm, and a swing with the intermediate arm. And an output arm for driving the valve. And the angle variable apparatus which changes continuously the angle of the rocking | fluctuation direction of the output arm with respect to an intermediate arm is provided. And a switching device will be in a drive state by connecting an input arm and an intermediate arm, and will be in a rest state by canceling the connection.

  In the second aspect, the intermediate arm is not particularly limited, but preferably includes a sleeve that enters between the input arm and its swing axis. This is because the input arm and the intermediate arm can be integrated together in the width direction in a compact manner by adopting a double arm structure in which the sleeve of the intermediate arm enters inside the input arm.

  In said 2 aspect, although the switching apparatus is not specifically limited, It is preferable that it is the following aspect. In other words, the switching device is a switch provided so as to be displaceable between a connection position straddling between the input side pin hole provided in the input arm and the intermediate side pin hole provided in the intermediate arm and a non-connection position not straddling. Has a pin. The switching device is provided outside the input arm, the intermediate arm, and the output arm, and biases the switching pin to one side of the coupling position and the non-coupling position at a predetermined time, and releases the biasing at times other than the predetermined time. An urging device; a return spring that urges the switching pin to the other side of the connecting position and the non-connecting position with a restoring force; a connecting side stopper provided on the input arm or the intermediate arm to stop the switching pin at the connecting position; It includes a non-connecting side stopper that is provided on the input arm or the intermediate arm and stops the switching pin at the non-connecting position.

  Here, the reason why the urging device is provided outside the input arm, the intermediate arm, and the output arm is that the inertial mass of the arms can be reduced and the structure of the arms can be simplified. On the other hand, the connection side stopper and the non-connection side stopper are provided on the input arm or the intermediate arm because the following advantages are obtained. That is, when the position of the input arm and intermediate arm is adjusted in any of the swing axis directions for continuously variable inter-cylinder adjustment, etc., the connection-side stopper always stops the switching pin at the connection position and disconnects it. The side stopper can stop the switching pin at the unconnected position.

The urging device is not particularly limited, but exemplifies the following modes 1 and 2.
[1] A mode including a biasing pin that biases the switching pin and a hydraulic mechanism that biases the biasing pin with hydraulic pressure.
[2] A mode including a biasing rod that biases the switching pin and an electromagnetic solenoid that biases the biasing rod with electromagnetic force.

And the aspect of a connection side stopper and a non-connection side stopper is although it does not specifically limit, The following aspects of 1 and 2 are illustrated.
[1] A mode in which the switching pin is stopped by contacting the switching pin.
[2] A mode in which the switching pin is stopped by contacting the urging device.

  The lost motion mechanism and its peripheral structure are not particularly limited, but the following mode is preferable. That is, a rest cam having a circular cross-sectional shape capable of contacting the intermediate arm is provided on the side of the drive cam. A lost motion spring that biases the input arm toward the drive cam when disconnected is provided, and an intermediate spring that biases the intermediate arm toward the rest cam when disconnected. The input side pin hole and the intermediate side pin hole are configured to communicate with each other when the input arm is urged by the drive cam and the intermediate arm is urged by the pause cam. In this way, at the time of non-connection, the intermediate arm always stops at the same position where it comes into contact with the pause cam regardless of the angle of the output arm with respect to the intermediate arm. It is because it can carry out stably in the same position.

  Although an angle variable apparatus is not specifically limited, The following aspect is illustrated. In other words, the angle variable device is inserted between the intermediate arm and the output arm and their swing axis, and is a slider in which helical splines having different angles with the inner peripheral surface of the intermediate arm and the inner peripheral surface of the output arm are engaged. It includes a gear and a slide device that displaces the slider gear in the swing axis direction with respect to the intermediate arm and the output arm.

  A variable valve mechanism 1 for a plurality of cylinders of the present embodiment shown in FIGS. 1 to 7 includes continuous variable valve mechanisms 9, 9,... For each cylinder of the internal combustion engine. Each continuously variable valve mechanism 9 is a mechanism that opens and closes the valves 7 and 7 by pressing the valves 7 and 7 to which the valve springs 8 and 8 are attached. The left and right cams project from the cylinder head. Provided between the supports 5 and 5. Specifically, each continuously variable valve mechanism 9 includes a drive unit 10, a rocker shaft 15, an input arm 20, an intermediate arm 30, an output arm 40, an angle variable device 50, and a switching device 60 described below. It is comprised including. In the present embodiment, one of the rocker shafts 15 in the length direction is referred to as the left and the other is referred to as the right.

[Drive unit 10]
The drive unit 10 includes a camshaft 11 that rotates in accordance with the rotation of the internal combustion engine, and a drive cam 12 and a pause cam 13 that project from the camshaft 11. The drive cam 12 is a cam for driving the input arm 20 and includes a base circle portion 12a having a circular cross-sectional shape and a cam nose portion 12b protruding from the base circle portion 12a. On the other hand, the pause cam 13 is a cam for stopping the intermediate arm 30 at a predetermined position by contacting the pause cam follower 33 of the intermediate arm 30 in the pause state, and only the base circle portion having a circular cross-sectional shape. Consists of. The pause cam 13 is provided on the left side of the drive cam 12.

[Rocker shaft 15]
The rocker shaft 15 is a pipe-like shaft that extends in the left-right direction and serves as the swing axis of the input arm 20, the intermediate arm 30, and the output arms 40, 40 of all the continuously variable valve mechanisms 9, 9. The rocker shaft 15 has a long hole (not shown) extending in the left-right direction for allowing the engagement pin 58 of the angle varying device 50 to be inserted in the radial direction, one for each continuously variable valve mechanism 9, 9. One by one.

[Input arm 20]
The input arm 20 is an arm extending in the front-rear direction, and swings when pressed by the drive cam 12. The input arm 20 includes a shaft hole 21 penetrating in the left-right direction at an intermediate portion in the length direction, and the rocker shaft 15 is inserted into the shaft hole 21 with the sleeve 32 and the slider gear 51 of the intermediate arm 30 interposed therebetween. Thus, the rocker shaft 15 is pivotally supported about the rocker shaft 15. Further, the input arm 20 includes an input roller 22 that rotatably contacts the drive cam 12 at the front end portion, and a lost motion pad 28 on the upper surface of the rear end portion. And between the lost motion pad 28 and the retainer 6 attached to the upper ends of the cam supports 5 and 5, the lost motion pad 28 is urged by a restoring force, so that the input arm 20 can be moved in a resting state. A lost motion spring 29 is provided for following the drive cam 12 (the input roller 22 is brought into contact with the drive cam 12). In addition, the input arm 20 includes an input side pin hole 26 that extends in the left-right direction and is opened on the left side surface at a lower portion of the rear end portion. Further, a cutout 27 is provided on the upper surface of the intermediate portion in the longitudinal direction of the input arm 20 for allowing the engagement pin 58 of the angle variable device 50 to pass during manufacture (assembly).

[Intermediate arm 30]
The intermediate arm 30 is provided on the left side of the input arm 20 and extends in the front-rear direction. When the intermediate arm 30 is connected to the input arm 20, it swings together with the input arm 20. The intermediate arm 30 includes a shaft hole 31 penetrating in the left-right direction in the middle portion in the length direction, and a cylinder protruding rightward so as to extend the inner peripheral surface of the shaft hole 31 and its peripheral portion to the right. A sleeve 32 is provided. The sleeve 32 is inserted into the shaft hole 21 of the input arm 20, and the rocker shaft 15 is inserted into the shaft hole 31 of the sleeve 32 with the slider gear 51 of the angle varying device 50 interposed therebetween. The arm 30 is pivotally supported on the left and inner sides of the input arm 20 so as to be swingable about the rocker shaft 15. A twisted intermediate helical spline 35 is provided on the inner peripheral surface of the shaft hole 31 of the intermediate arm 30. The intermediate helical spline 35 is twisted in one direction and turns to one side in the circumferential direction. Further, a through-hole 37 is provided on the upper surface of the sleeve 32 of the intermediate arm 30 to allow the engagement pin 58 of the angle variable device 50 to pass through at the time of manufacture (assembly).

  Further, the intermediate arm 30 includes a pause cam follower 33 that abuts the pause cam 13 at the front end portion, and an intermediate spring pad 38 is provided on the upper surface of the rear end portion. The intermediate spring pad 38 is urged between the intermediate spring pad 38 and the retainer 6 by a restoring force, so that the intermediate arm 30 is brought into contact with the pause cam 13 when not connected (the pause cam follower 33). Is provided with an intermediate spring 39 for abutting with the rest cam 13.

  The intermediate arm 30 includes an intermediate pin hole 36 extending in the left-right direction penetrating in the left-right direction at the lower portion of the rear end. When the input roller 22 of the input arm 20 is in contact with the base circle portion 12a of the drive cam 12 and the pause cam follower 33 of the intermediate arm 30 is in contact with the pause cam 13, the input side pin hole 26 The center line overlaps with the center line of the intermediate pin hole 36 so that the input side pin hole 26 and the intermediate pin hole 36 communicate with each other. The inner side pin hole 36 has an inner diameter smaller than that of the input side pin hole 26.

[Output arms 40, 40]
The output arms 40, 40 are arms extending in the front-rear direction, one each provided on the left and right sides of the intermediate arm 30, and swing with the intermediate arm 30 to drive the valves 7, 7. Each output arm 40 is provided with a shaft hole 41 penetrating in the left-right direction in the middle portion in the length direction, and the rocker shaft 15 is inserted into the shaft hole 41 with the slider gear 51 of the angle varying device 50 interposed therebetween. Thus, the rocker shaft 15 is pivotally supported by the rocker shaft 15. Further, an output pad 44 for pressing the stem end of the valve 7 is provided on the lower surface of the distal end portion of each output arm 40. The inner peripheral surface of the shaft hole 41 is provided with an output-side helical spline 45 on the other side that turns rightward and turns to the other side in the circumferential direction. The left side surface of the left output arm 40 is in contact with the right side surface of the left cam support 5 with a left shim (not shown) interposed therebetween, and the right side surface of the right output arm 40 is the left side of the right cam support 5. The input arm 20, the intermediate arm 30, and the output arms 40, 40 are restrained so as not to be displaced in the left-right direction by contacting the surface with a right shim (not shown) interposed therebetween.

  A swing arm 48 is interposed between the output pad 44 of each output arm 40 and the stem end of the valve 7, and the base end portion of the swing arm 48 is swingably supported by a lash adjuster 49. As a result, the valve clearance is automatically adjusted.

[Variable angle device 50]
The variable angle device 50 is a device that continuously changes the drive amount of the valves 7 and 7 by continuously changing the angle of the swinging direction of the output arms 40 and 40 with respect to the intermediate arm 30. Specifically, the angle variable device 50 includes a slider gear 51 and a slide device 56 as described below.

  The slider gear 51 is inserted between the intermediate arm 30 and the output arm 40 and the rocker shaft 15, and has an outer circumferential surface on one side twisted intermediate helical that meshes with the intermediate helical spline 35 of the intermediate arm 30. A spline 53 and twisted output helical splines 54, 54 on the other side meshing with the output side helical splines 45, 45 of the output arms 40, 40 are provided.

  The slide device 56 is a device that displaces the slider gear 51 in the left-right direction with respect to the intermediate arm 30 and the output arms 40, 40 that are restrained so as not to be displaced in the left-right direction. The slide device 56 is inserted inside the rocker shaft 15 so as to be displaceable in the left-right direction, and protrudes from the control shaft 57 and passes through a long hole (not shown) of the rocker shaft 15. It includes an engaging pin 58 engaged with the slider gear 51 so as not to be relatively displaceable in the left-right direction and relatively displaceable in the circumferential direction, and a shaft displacement device (not shown) for displacing the control shaft 57 in the left-right direction. ing.

[Switching device 60]
The switching device 60 includes a driving state in which the input arm 20 and the intermediate arm 30 are connected so as not to be able to swing relative to each other and the valves 7 and 7 are driven, and a suspension state in which the connection is released to stop driving the valves 7 and 7. Is a device that performs switching at once (that is, discontinuously changing the drive amount). This switching device 60 is configured to be controlled for each switching device 60, 60... (For each continuous variable valve mechanism 9, 9,...), Thereby enabling switching for each cylinder. It is configured. Specifically, the switching device 60 includes a switching pin 61, an urging device 63, a return spring 66, a connection side stopper 67, and a non-connection side stopper 68, which will be described below.

  The switching pin 61 is a cylindrical pin provided so as to be displaceable between a connection position straddling between the input side pin hole 26 and the intermediate side pin hole 36 and a non-connection position not straddling. The switching pin 61 is inserted into the input-side pin hole 26, and has a large-diameter portion 61a whose outer diameter is slightly smaller than the inner diameter of the input-side pin hole 26 and larger than the inner diameter in the intermediate-side pin hole 36, and a large-diameter portion 61a. And a small-diameter portion 61b that protrudes to the left from the left end surface of the intermediate pin and is slightly smaller than the inner diameter of the intermediate pin hole 36. The interposition pin 62 is a cylindrical pin whose outer diameter is inserted into the intermediate pin hole 36 and is slightly smaller than the inner diameter of the intermediate pin hole 36, and the right end surface is the left end surface of the small diameter portion 61 b of the switching pin 61. Abut.

  The urging device 63 is a device that urges the switching pin 61 to the right unconnected position at a predetermined time (when disconnected), and releases the urging force at other times (when connected). The cam support 5 is provided. The urging device 63 has a urging pin 64 whose right end surface is in contact with the left end surface of the interposition pin 62, and urges the urging pin 64 to the right side by hydraulic pressure when not connected, and releases the urging when connected. And a hydraulic mechanism 65. The return spring 66 is a spring that urges the switching pin 61 to the left connecting position with a restoring force, and is interposed between the inner bottom surface of the input side pin hole 26 and the switching pin 61.

  The connection side stopper 67 is a stopper for stopping the switching pin 61 urged to the left by the return spring 66 at the connection position, and the right side surface of the intermediate arm 30 (the periphery of the right opening of the intermediate pin hole 36). Part). Specifically, the outer edge portion of the left end surface of the large diameter portion 61a abuts on the connection side stopper 67 (the peripheral portion of the right side opening of the intermediate pin hole 36), whereby the switching pin 61 stops at the connection position.

  The non-connection side stopper 68 is a stopper for stopping the switching pin 61 urged rightward by the urging device 63 at the non-connection position, and is a left side surface of the intermediate arm 30 (the left side of the intermediate side pin hole 36). (Peripheral portion of the opening). Specifically, a part of the right end surface of the urging pin 64 abuts on the non-connecting side stopper 68 (a peripheral portion of the left opening of the intermediate side pin hole 36), whereby the switching pin 61 stops at the non-connecting position.

  The driving state and the resting state of the continuously variable valve mechanism 9 described above will be described below.

[1] Driving State When the driving state shown in FIG. 7a is set, the return spring 66 is restored by turning off the hydraulic pressure of the hydraulic mechanism 65 and releasing the urging force of the switching pin 61 to the right by the urging pin 64. The switching pin 61 is displaced to the left by force, and the small diameter portion 61b of the switching pin 61 enters the left intermediate pin hole 36 from the input side pin hole 26, and the outer edge portion of the left end surface of the large diameter portion 61a. Comes into contact with the right side surface of the intermediate arm 30 (connection side stopper 67). Thereby, the switching pin 61 stops at this position (connecting position), and the input arm 20 and the intermediate arm 30 are connected so as not to be relatively rockable. Therefore, the input arm 20, the intermediate arm 30, and the output arms 40 and 40 swing together to drive the valves 7 and 7.

[2] Resting State When the resting state shown in FIG. 7b is established, the oil pressure of the hydraulic mechanism 65 is turned on and the switching pin 61 is biased to the right by the biasing pin 64, whereby the small diameter portion 61b of the switching pin 61 is The intermediate pin hole 36 retreats to the right input side pin hole 26, and a part of the right end surface of the urging pin 64 comes into contact with the left side surface of the intermediate arm 30 (non-connecting side stopper 68). Thereby, the switching pin 61 stops at this position (non-connecting position), and the connection between the input arm 20 and the intermediate arm 30 is released. For this reason, the input arm 20 swings relative to the intermediate arm 30 and the output arms 40 and 40 (idle swing), and the intermediate arm 30 and the output arms 40 and 40 do not swing. Therefore, the driving of the valves 7 and 7 is stopped.

  According to the present embodiment, the following effects A to G can be obtained.

[A] Since the switching device 60 is configured to be controlled for each switching device 60, 60... (Each continuous variable valve mechanism 9, 9,...), One of a plurality of cylinders is selected. The valve drive can be stopped (reduced cylinder) with only a part of the cylinders. Therefore, it leads to improvement in fuel consumption.

[B] Apart from the variable angle device 50 that continuously changes the drive amount of the valves 7 and 7, there is a switching device 60 that switches between the resting state and the driving state at once, so the responsiveness of resting and returning is improved. To do.

[C] As described above, since the responsiveness of the pause is improved, depending on the design, the drive state is surely switched from the drive state to the pause state (for example, switching at 0.015 seconds or less at 6000 rpm). It is also possible to prevent the catalyst from deteriorating due to a delay in pause and protect the catalyst.

[D] By adopting a double arm structure in which the sleeve 32 of the intermediate arm 30 is inserted between the input arm 20 and the rocker shaft 15, the horizontal width of the input arm 20 and the intermediate arm 30 as a whole is kept small. Thus, the width of the conventional input arm 92 can be made equal to the width in the left-right direction. Therefore, the input arm 92 of the continuous variable valve mechanism 90 of the conventional example can be replaced with the input arm 20 and the intermediate arm 30 of the present embodiment, whereby the output arms 40 and 40 and the angle variable device 50 can be obtained. Can be made completely the same as the output arms 94, 94 and the angle variable device 95 of the conventional example to provide compatibility. Therefore, it leads to cost reduction.

[E] The biasing device 63 of the switching device 60 is formed on the left cam support 5 outside the input arm 20, the intermediate arm 30, and the output arm 40. The mass can be reduced and the structure of the arms 20, 30, and 40 can be simplified.

[F] Since the connection side stopper 67 and the non-connection side stopper 68 are formed on the intermediate arm 30, the following advantages are obtained. That is, in order to adjust the initial value of the angle of the output arm 40 with respect to the intermediate arm 30 between the cylinders or the like, the three types of arms 20, 30, 40 (the input arm 20, the intermediate arm 30, and the output arm 40, 40) are totally arranged. When the position is adjusted in the left-right direction by a shim (not shown) or the like, the connection side stopper 67 and the non-connection side stopper 68 are also displaced in the left-right direction together with the intermediate arm 30. Therefore, when the three types of arms 20, 30, and 40 are adjusted in any of the left and right directions, the connection-side stopper 67 always stops the switching pin 61 at the connection position, and the non-connection-side stopper 68 is switched to the switching pin 61. Is always stopped at the unconnected position.

[G] Since the pause cam follower 33 that abuts the pause cam 13 is provided not on the output arm 40 but on the intermediate arm 30, the intermediate arm 30 is in the idle state regardless of the angle of the output arm 40 with respect to the intermediate arm 30. 30 always stops at the same position. Further, when the input arm 20 is urged to the base circular portion 12a of the drive cam 12 by the lost motion spring 29 and the intermediate arm 30 is urged to the rest cam 13 by the intermediate spring 39, the input side pin Since the hole 26 and the intermediate pin hole 36 communicate with each other, the switching pin 61 easily enters the intermediate pin hole 36 when switching from the rest state to the driving state. Therefore, switching can be performed quickly and reliably.

  In addition, this invention is not limited to the said Example, For example, like the following modification, it can also be changed and embodied suitably in the range which does not deviate from the meaning of invention.

[Modification 1]
A stopper member that is attached to the vicinity of the left opening of the input side pin hole 26 and contacts the outer edge portion of the left end surface of the large-diameter portion 61a of the switching pin 61 instead of configuring the connection side stopper 67 by the right side surface of the intermediate arm 30. You may comprise by.

[Modification 2]
Instead of configuring the non-connecting side stopper 68 by the left side surface of the intermediate arm 30, it may be configured by a stopper member that is attached to the right end side (bottom surface side) of the input side pin hole 26 and contacts the right end surface of the switching pin 61. Good.

[Modification 3]
By energizing the switching pin 61 with the urging device 63, the suspending state is set, and instead of setting the driving state by releasing the urging, the driving state is set by urging and the urging is released. You may make it be a dormant state.

[Modification 4]
Instead of being controlled by each switching device 60, 60... (Each continuously variable valve mechanism 9, 9...), It is configured to be controlled by a plurality of switching devices 60, 60. May be.

[Modification 5]
Instead of providing the continuously variable valve mechanisms 9, 9... Of the present embodiment provided with the switching device 60 for all the cylinders, the continuously variable valve mechanisms 9, 9 of the present embodiment are applied only to some cylinders. 9 may be provided, and the conventional continuously variable valve mechanisms 90, 90 that do not include a switching device may be provided for the other cylinders.

DESCRIPTION OF SYMBOLS 1 Variable valve mechanism 7 Valve 9 Continuously variable valve mechanism 12 Drive cam 13 Rest cam 20 Input arm 26 Input side pin hole 29 Lost motion spring 30 Intermediate arm 32 Sleeve 36 Intermediate side pin hole 39 Intermediate spring 40 Output arm 50 Angle Variable device 51 Slider gear 56 Slide device 60 Switching device 61 Switching pin 63 Biasing device 66 Return spring 67 Connection side stopper 68 Non-connection side stopper

Claims (6)

In a variable valve mechanism for a plurality of cylinders, which is provided with a continuously variable valve mechanism (9) for driving each valve (7) and continuously changing the drive amount of the valve (7) for each cylinder of the internal combustion engine,
One or more continuous variable valve mechanisms (9) are provided with a switching device (60) that switches between a resting state in which driving of the valve (7) is suspended and a driving state in which the suspension is released and the valve (7) is driven. ) And configured to enable the switching for each of some cylinders, so that only the valves (7) of some cylinders can be deactivated while the valves (7) of other cylinders are driven,
The continuously variable valve mechanism (9) provided with the switching device (60) is driven by the drive cam (12) to swing, and when connected to the input arm (20), the input arm (20). ) Swinging with the intermediate arm (30), output arm (40) swinging with the intermediate arm (30) and driving the valve (7), and swinging of the output arm (40) with respect to the intermediate arm (30) An angle variable device (50) for continuously changing the angle of the direction,
The switching device (60) is in a driving state by connecting the input arm (20) and the intermediate arm (30), and is in a resting state by releasing the connection, so that the variable valve of the internal combustion engine mechanism. Intermediate arm (30) includes an input arm (20) and the variable valve mechanism for an internal combustion engine according to claim 1, further comprising a sleeve (32) inserted between the pivot axis. The switching device (60) has a connecting position and straddle between the input side pin hole (26) provided in the input arm (20) and the intermediate side pin hole (36) provided in the intermediate arm (30). The variable valve mechanism for an internal combustion engine according to claim 1 or 2, further comprising a switching pin (61) provided displaceably at a non-connected position. The switching device (60) is provided outside the input arm (20), the intermediate arm (30), and the output arm (40), and biases the switching pin (61) to one side of the connected position and the unconnected position at a predetermined time. A biasing device (63) for releasing the biasing at a time other than a predetermined time, a return spring (66) for biasing the switching pin (61) to the other side of the connecting position and the non-connecting position with a restoring force, A connection side stopper (67) provided on the input arm (20) or the intermediate arm (30) to stop the switching pin (61) at the connection position, and a switch provided on the input arm (20) or the intermediate arm (30). The variable valve mechanism for an internal combustion engine according to claim 3, further comprising a non-connecting side stopper (68) for stopping the pin (61) at a non-connecting position. On the side of the drive cam (12), there is provided a pause cam (13) having a circular cross-sectional shape capable of coming into contact with the intermediate arm (30).
A lost motion spring (29) that biases the input arm (20) to the drive cam (12) when disconnected, and an intermediate spring (39) that biases the intermediate arm (30) to the rest cam (13) when disconnected And
When the input arm (20) is urged by the drive cam (12) and the intermediate arm (30) is urged by the rest cam (13), the input side pin hole (26) and the intermediate side pin The variable valve mechanism for an internal combustion engine according to claim 3 or 4 , wherein the variable valve mechanism is configured to communicate with the hole (36). The variable angle device (50) is inserted between the intermediate arm (30) and the output arm (40) and the swing axis thereof, and the inner peripheral surface of the intermediate arm (30) and the output arm (40). A slider gear (51) meshing with helical splines having different angles with the peripheral surface, and a slide device for displacing the slider gear (51) relative to the intermediate arm (30) and the output arm (40) in the direction of their swing axis The variable valve mechanism for an internal combustion engine according to any one of claims 1 to 5 , wherein the variable valve mechanism is configured to include (56).

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