JP2009228591A - Suction and exhaust valve driving system of internal combustion engine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electric-driven air intake and exhaust valve driving system of an internal combustion engine capable of realizing the considerable miniaturization of a cylinder head. <P>SOLUTION: In the air intake and exhaust valve driving system A of an internal combustion engine 1, a solenoid 4 for driving an air intake valve 2 and an air exhaust valve 3 of the internal combustion engine 1 is provided on a cylinder head 5. Connection/disconnection means 21, 22 for selectively connecting or disconnecting a rocker arm 61 for driving the air intake valve 2 and a rocker arm 62 for driving the air exhaust valve 3 are provided on a plunger 6 of the solenoid 4. The position of power points F1, F2 to the rocker arms 61, 62 of the connection/disconnection means 21, 22 are set inward of a stem end of a valve stem 7 of the air intake valve 2 and a stem end of a valve stem 8 of the air exhaust valve 3. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an intake / exhaust valve drive system for an internal combustion engine mounted on various vehicles and the like, and in particular, an electric intake / exhaust valve in which a plurality of intake valves or exhaust valves are driven by a single solenoid provided in a cylinder head. The present invention relates to an exhaust valve drive system.

  Conventionally, an intake / exhaust valve of an internal combustion engine employs a mechanical transmission system in which a reciprocating driving force is transmitted by a camshaft that is rotationally driven by a crankshaft. However, recently, in order to improve responsiveness, a transmission system that electrically operates the intake and exhaust valves has been proposed. For example, a valve timing control mechanism for an internal combustion engine in which a swing cam is combined with a solenoid has been proposed (see, for example, Patent Document 1). In this example, a solenoid is linked to a rocker shaft integral with the swing cam, and the valve is reciprocated by sliding the swing cam driven by the reciprocation of the solenoid on the tappet. Yes. The swing cam detects the swing angle by an angle sensor, and is given confirmation (feedback) as to whether or not a predetermined valve lift is being performed.

  Further, in the intake / exhaust valve drive system configured so that the lower end of the stopper rod integrated with the armature of the electromagnetic actuator is brought into sliding contact with the rocking end of the rocker arm rocked by the cam formed on the camshaft, There has also been proposed a valve timing control apparatus for an internal combustion engine that controls the valve closing timing by temporarily holding the opened valve (see, for example, Patent Document 2). In this example, the response delay of the electromagnetic actuator is predicted, and the valve holding timing by the electromagnetic actuator is controlled based on the predicted value, thereby ensuring the reliable holding of the valve by the electromagnetic actuator and the efficient efficiency of the electromagnetic actuator. Both power saving through operation is achieved.

Further, an electromagnetic actuator in which the intake / exhaust valve is directly driven by a solenoid instead of the mechanical / electrical combination type as described above has been proposed (see, for example, Patent Document 3). In this example, in order to easily perform the wiring work for the coil and reduce the manufacturing cost by sharing the wiring, the coil reciprocates between two electromagnets facing each other and spaced apart from each other. An armature is arranged, and the armature is directly connected to the intake valve or the exhaust valve. In other words, the electromagnetic actuator is disposed immediately above the valve shaft so that the armature of the electromagnetic actuator is aligned with the axial center line of the valve shaft of the intake valve or the valve shaft of the exhaust valve.
JP-A-11-101109 JP 2003-293799 A JP 2001-126919 A

  In the configuration described in Patent Document 1, as shown in FIG. 1 to FIG. 6 in the same document, the axial center line of the solenoid plunger is disposed in the lateral direction perpendicular to the valve shaft, so that the solenoid body is The cylinder head protrudes to one side. For this reason, the side portion of the cylinder head protrudes in the lateral direction and becomes very bulky, and the downsizing of the engine room is significantly hindered.

  In the configuration described in Patent Document 2, the lower end of the stopper rod integrated with the armature of the electromagnetic actuator is brought into sliding contact with the rocking end of the rocker arm protruding outward from the valve shaft. Space for storage is required in the side part in the cylinder head. Therefore, also in this case, the cylinder head becomes bulky, and the downsizing of the engine room is prevented.

  The electromagnetic actuator described in Patent Document 3 is disposed at a position immediately above the valve shaft so that the axial center line of the armature coincides with the axial center line of the valve shaft of the intake valve or the exhaust valve. The electromagnetic actuator disposed at a position directly above both valve shafts protrudes so as to expand in a large V shape on both sides of the cylinder head. Accordingly, in this case as well, the cylinder head protrudes to both sides and becomes large and bulky, and the downsizing of the engine room is significantly hindered. For this reason, when a solenoid for driving the intake / exhaust valve is provided in the cylinder head, a countermeasure for making the cylinder head as compact as possible is required.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide an electric intake / exhaust valve drive system for an internal combustion engine in which the cylinder head can be significantly reduced in size.

  An intake / exhaust valve drive system for an internal combustion engine according to the present invention relates to an intake / exhaust valve drive system for an internal combustion engine in which a solenoid for driving an intake valve and an exhaust valve of the internal combustion engine is provided in a cylinder head. Connection / separation means for selectively connecting or disconnecting the plunger of the solenoid and the rocker arm for driving the intake valve or the exhaust valve is provided. The position of the force point of the connecting / separating means with respect to the rocker arm is set to a position inside the shaft end of the valve shaft of the intake valve or the shaft end of the valve shaft of the exhaust valve.

  According to such a configuration, the connecting / separating means for selectively connecting or separating the plunger of the solenoid and the rocker arm for driving the intake valve or the rocker arm for driving the exhaust valve in a timely manner. The position of the power point with respect to the rocker arm is set at a position inside the shaft end of the valve shaft of the intake valve or the shaft end of the valve shaft of the exhaust valve, so that the solenoid is driven by the intake valve or exhaust valve to be driven Can be disposed at an intermediate position. For example, when driving the intake and exhaust valves, the solenoid can be arranged in the center of the cylinder head, so the cylinder head can be made compact without causing the cylinder head to protrude outward. Become. Even when driving a plurality of intake valves or a plurality of exhaust valves with a single solenoid, the solenoid can be arranged at an intermediate position between the valves to be driven. Can be realized.

  In addition, since the solenoid plunger and the rocker arm for driving the intake valve or the rocker arm for driving the exhaust valve are selectively connected or separated by the connecting / separating means in a timely manner, a single solenoid is used. Thus, a plurality of intake valves or exhaust valves, that is, intake valves and exhaust valves or a plurality of intake valves and a plurality of exhaust valves can be driven alternately. Therefore, the number of solenoids can be reduced as compared with the case where the intake valve and the exhaust valve are individually driven by a single solenoid. As a result, the cylinder head can be made more compact, and the number of parts, the weight, and the cost can be reduced.

  In such an intake / exhaust valve drive system for an internal combustion engine, an intermediate link is connected to the plunger, the intermediate link, and a rocker arm for driving the intake valve or a rocker arm for driving the exhaust valve, May be detachably connected by the connecting / separating means. In this way, the intake valve and the exhaust valve can be driven alternately with a simple configuration. In addition, a plurality of intake valves and a plurality of exhaust valves can be alternately driven by a single solenoid.

  Another intake / exhaust valve drive system for an internal combustion engine according to the present invention relates to an intake / exhaust valve drive system for an internal combustion engine in which a solenoid for driving an intake valve and an exhaust valve of the internal combustion engine is provided in a cylinder head. The solenoid is provided horizontally, and both ends of the plunger of the solenoid are connected to a rocker arm for driving the intake valve and a rocker arm for driving the exhaust valve selectively and timely and transmitted. The selective transmission means is provided. The position of the force point of the selective transmission means with respect to the rocker arm is set to a position inside the shaft end of the valve shaft of the intake valve or the shaft end of the valve shaft of the exhaust valve.

  According to such a configuration, the selective transmission for selectively connecting the both ends of the plunger of the solenoid to the rocker arm for driving the intake valve and the rocker arm for driving the exhaust valve in a timely manner. The position of the force point with respect to the rocker arm of the means is set to a position inside the shaft end of the valve shaft of the intake valve and the shaft end of the valve shaft of the exhaust valve. Therefore, the solenoid can be disposed at the center portion on the cylinder head. Thereby, the cylinder head can be made compact by avoiding the cylinder head from protruding outward.

  In addition, since both ends of the solenoid plunger are selectively connected to the rocker arm for driving the intake valve and the rocker arm for driving the exhaust valve by selective transmission means, a single solenoid is used. Thus, the intake valve and the exhaust valve or the plurality of intake valves and the exhaust valve can be driven alternately. Accordingly, since the number of solenoids can be reduced as compared with the case where the intake valve or the exhaust valve is individually driven by a single solenoid, this makes it possible to make the cylinder head more compact and reduce the number of parts. Reduction, weight reduction, and cost reduction can be realized. As the solenoid, a central return type three-position solenoid that has a stable return point in a neutral position when not energized and is driven bidirectionally by a selected coil can be employed.

  According to the intake / exhaust valve drive system for an internal combustion engine of the present invention, a plurality of intake valves or exhaust valves can be driven by a single solenoid, and the solenoids are arranged at intermediate positions of the driven intake valves or exhaust valves. Can be set. Therefore, the cylinder head can be significantly reduced in size by avoiding the cylinder head from protruding outward.

  According to another intake / exhaust valve drive system for an internal combustion engine of the present invention, a plurality of intake valves or exhaust valves can be driven by a single solenoid, and the solenoids are disposed in the central portion on the cylinder head. Can do. Therefore, the cylinder head can be significantly reduced in size by avoiding the cylinder head from protruding outward.

  Hereinafter, embodiments of an intake / exhaust valve drive system for an internal combustion engine according to the present invention will be described in detail with reference to the drawings.

[Embodiment 1]
FIG. 1 is an explanatory diagram showing a main configuration of an intake / exhaust valve drive system (hereinafter referred to as a valve drive system A) of the internal combustion engine 1. In this valve drive system A, a single solenoid 4 is placed vertically in the center of the upper surface of the cylinder head 5, and the intake valve 2 and the exhaust valve 3 are driven alternately by the reciprocating motion of the plunger 6 of the solenoid 4. Can do. That is, connecting / separating means 21 and 22 are provided for selectively connecting or disconnecting the plunger 6 of the solenoid 4 and the rocker arms 61 and 62 for driving the intake valve 2 and the exhaust valve 3 in a timely manner. The force points F1 and F2 of the separating means 21 and 22 with respect to the rocker arms 61 and 62 are set inside the shaft end (upper end) of the valve shaft 7 of the intake valve 2 and the shaft end (upper end) of the valve shaft 8 of the exhaust valve 3. The position is set. For the connection / separation means 21, 22, for example, an electromagnetic chuck or the like can be used. Therefore, since the single solenoid 4 can be provided at the center of the upper surface of the cylinder head 5, the cylinder head 5 can be significantly reduced in size. Further, the number of expensive solenoids 4 can be reduced, and the weight can be reduced and the cost can be reduced.

  The connecting / separating means 21 and 22 are provided between both ends of the horizontal intermediate link 23 connected to the plunger 6 and a rocker arm 61 for driving the intake valve 2 and a rocker arm 62 for driving the exhaust valve 3. The intermediate link 23 and the rocker arms 61 and 62 can be selectively connected or separated respectively. The bases of the rocker arms 61 and 62 are rotatably supported in the engine block E by pin shafts p and p, respectively. Further, the intake valve 2 and the exhaust valve 3 are urged in a direction (upward) to close the valve port by coil springs s and s fitted on the upper portions of the valve shafts 7 and 8, respectively. Then, by alternately exciting the two connection / separation means 21 and 22, one rocker arm 61 and the other rocker arm 62 are alternately connected to or separated from the intermediate link 23, and a single The intake valve 2 and the exhaust valve 3 can be alternately opened and closed by reciprocating the plunger 6 in the vertical direction. Therefore, a four-valve engine (see Case 1 of Type I with two intake valves (# In-1 and # In-2) and two exhaust valves (# Ex-1 and # Ex-2)) In such a case, a pair of such valve drive systems A may be provided.

  The basic operation of the intake valve 2 and the exhaust valve 3 in the valve drive system A using such an electromagnetic chuck as the connecting / separating means 21 and 22 will be described. First, in the valve fully closed state (initial state), as shown in FIG. 1, both ends of the intermediate link 23 and both rocker arms are excited by excitation of both electromagnetic chucks 21 and 22 while the solenoid 4 is in a non-excited state. 61 and 62 are connected. On the other hand, in the valve fully opened state, the coil c of the solenoid 4 is excited and the armature a becomes the coil c in a state where both ends of the intermediate link 23 and the rocker arms 61 and 62 are connected by the electromagnetic chucks 21 and 22. Since it is attracted, the intermediate link 23 is pulled upward. Then, one rocker arm 61 rotates clockwise and the other rocker arm 62 rotates counterclockwise, and pushes down the valve shaft 7, the intake valve 2, the valve shaft 8, and the exhaust valve 3, respectively. . Thereby, the intake port and the exhaust port are simultaneously opened.

  In the exhaust stroke, one electromagnetic chuck 21 is demagnetized and one end of the intermediate link 23 and one rocker arm 61 are separated, while the other electromagnetic chuck 22 is excited and the other end of the intermediate link 23 is The other rocker arm 62 is connected. In this state, when the solenoid 4 is excited and the intermediate link 23 is pulled upward, only the other rocker arm 62 rotates counterclockwise, the valve shaft 8 and the exhaust valve 3 are pushed down, and the exhaust port is It is opened and the intake port remains closed. On the other hand, in the intake stroke, one electromagnetic chuck 21 is excited and one end of the intermediate link 23 and the rocker arm 61 are connected, while the other electromagnetic chuck 22 is demagnetized, and the other end of the intermediate link 23 and the other link are connected. The rocker arm 62 is separated. In this state, when the solenoid 4 is excited and the intermediate link 23 is pulled upward, only the valve shaft 7 and the intake valve 2 are pushed down, the intake port is opened, and the exhaust port remains closed.

  In such a valve drive system A, in order to connect / separate the two members as the connecting / separating means 21, 22, oil pressure is used between the connecting position where the two members are connected and the separating position where the two members are separated. A known operating pin (not shown) that is operated to move can also be used. By using such an operating pin, the intermediate link can be configured to be selectively connected or disconnected to both rocker arms in a timely manner. The basic operation of the intake valve and the exhaust valve in that case will be described with reference to FIGS. 2 (A) and 2 (B) and FIGS. 3 (A) and 3 (B). In this case, the intermediate link 24 is configured to be rotatable in a bent state at a connection point J with a plunger of a solenoid (not shown). Further, the rocker arms 61 and 62 rotate with the fixed fulcrums P1 and P2 as rotation fulcrums, respectively, and are connected to the intermediate link 24 by joints T1 and T2.

  First, in the valve fully closed state (initial state), the solenoid is in a non-excited state, and as shown in FIG. The arms 61 and 62 are connected. On the other hand, in the valve fully opened state, as shown in FIG. 2 (B), the both ends of the intermediate link 24 and the rocker arms 61 and 62 are connected to each other by the operating pins 21 and 22. When excited, the intermediate link 24 is pulled upward. Then, one rocker arm 61 rotates clockwise and the other rocker arm 62 rotates counterclockwise, and pushes down the valve shaft 7, the intake valve 2, the valve shaft 8, and the exhaust valve 3, respectively. . Thereby, the intake port and the exhaust port are simultaneously opened.

  Further, in the exhaust stroke, as shown in FIG. 3A, one operation pin 21 moves to the separation position, and one end of the intermediate link 24 and one rocker arm 61 are separated, while the other operation pin. 22 moves to the connecting position, and the other end of the intermediate link 24 and the other rocker arm 62 are connected. In this state, when the solenoid is excited and the intermediate link 24 is pulled upward, only the other rocker arm 62 rotates counterclockwise, the valve shaft 8 and the exhaust valve 3 are pushed down, and the exhaust port is opened. As a result, the intake port remains closed. On the other hand, in the intake stroke, as shown in FIG. 3B, one operating pin 21 moves to the connecting position, and one end of the intermediate link 24 and the rocker arm 61 are connected, while the other operating pin 22 is connected. It moves to the separation position, and the other end of the intermediate link 24 and the other rocker arm 62 are separated. In this state, when the solenoid is excited and the intermediate link 24 is pulled upward, only the valve shaft 7 and the intake valve 2 are pushed down, the intake port is opened, and the exhaust port remains closed.

  In such a valve drive system A as shown in FIGS. 1, 2, and 3, for example, as shown in a case 2 of type I in FIG. In-2) can be driven and the other exhaust valve (# Ex-1 and # Ex-2) can be driven by the other solenoid. In that case, one intermediate link is detachably connected to the two rocker arms on the intake side via the connecting / separating means, and the other intermediate link is connected to the two exhaust side via the connecting / separating means. What is necessary is just to connect to a rocker arm so that separation is possible. In this case, a solenoid can be arranged at an intermediate position between the two intake valves (# In-1 and # In-2), and the cylinder head 5 is prevented from overhanging to the side, so that it is lightweight. And downsizing can be realized. In such a configuration, in the normal drive mode, as described above, the two intake valves (# In-1 and # In-2) and the two exhaust valves (# Ex-1 and # Ex-2) are used. For example, during low-speed operation, by suspending one of the two intake valves (# In-1 and # In-2) It can also be burned efficiently to achieve low fuel consumption. Alternatively, the two intake valves and the exhaust valve can be controlled to open and close at appropriate timings.

  For example, as shown in the upper and lower stages of Type I case 3 in FIG. 4, a single solenoid can be used to deal with a four-valve engine. In the case of the upper stage, two rocker arms that drive two intake valves (# In-1 and # In-2) are connected to one intermediate link, and two exhaust valves (# Ex-1 and # Ex-2) are connected. ) Is connected to the other intermediate link, and one intermediate link and the other intermediate link are connected to a single solenoid plunger via connection / separation means. What is necessary is just to detachably connect with this intermediate link. In this case, since a single solenoid is sufficient, the cylinder head 5 can be further significantly reduced in size, greatly reduced in weight, and reduced in cost.

  In such a configuration, in the normal drive mode, by connecting / disconnecting one intermediate link and the other intermediate link alternately to another intermediate link connected to the plunger by the connecting / disconnecting means. Two intake valves (# In-1 and # In-2) and two exhaust valves (# Ex-1 and # Ex-2) can be driven alternately. Also, in order to be able to implement fuel-efficient driving during low-speed driving, etc., two rocker arms that drive two intake valves (# In-1 and # In-2) and one intermediate link May be connected via a connecting / separating means.

  In the case of the lower part of case 3 of type I in FIG. 4, two rocker arms that drive one intake valve (# In-1) and exhaust valve (# Ex-1) are connected via connecting / separating means. The two rocker arms that are connected to one intermediate link and drive the other intake valve (# In-2) and exhaust valve (# Ex-2) are connected to the other intermediate link via connection / separation means. One intermediate link and the other intermediate link may be connected to another intermediate link connected to the solenoid plunger. Even in this case, since a single solenoid is sufficient, the cylinder head 5 can be significantly reduced in size and greatly reduced in weight.

  In such a configuration, in the normal drive mode, one intake valve (# In-1) and exhaust valve (# Ex-1) and the other intake valve (# In-2) are connected and disconnected by the connection / separation means. And the exhaust valve (# Ex-2) can be driven alternately. During low-speed operation, etc., one of the intake valves (# In-1 or # In-2) is deactivated by the connecting / separating means, so that a thin mixture with less gasoline can be burned efficiently. Also, low fuel consumption can be realized. As described above, in the first embodiment, a plurality of intake valves 2 or exhaust valves 3 can be driven by a single solenoid 4, so that the cylinder head 5 can be remarkably compact, Reduction of the number of parts, weight reduction, and cost reduction can be realized.

[Embodiment 2]
FIG. 5 is an explanatory diagram showing a main configuration of an intake / exhaust valve drive system (hereinafter referred to as a valve drive system B) of the internal combustion engine 1. In addition, the same code | symbol is attached | subjected about the same thru | or equivalent member as previous embodiment, and the description is abbreviate | omitted. In this valve drive system B, a single solenoid 4 is disposed horizontally in the center of the cylinder head 5, and one end of a plunger 6 of the solenoid 4 and a rocker arm 61 for driving the intake valve 2 are provided. It connects by the 1st selective transmission means 31 for selectively connecting transmission at timely. On the other hand, the other end of the plunger 6 and the rocker arm 62 for driving the intake valve 2 are connected by the second selective transmission means 32 for selectively transmitting and connecting timely. As the solenoid 4, a central return type three-position solenoid having a stable return point in a neutral position when not energized and driven in both directions by selecting and exciting the coil c1 or c2 can be adopted. With such a configuration, the intake valve 2 and the exhaust valve 3 can be driven alternately by the reciprocating motion of the plunger 6 of the single solenoid 4.

  Then, the position of the first force point F1 with respect to the rocker arm 61 of the first selective transmission means 31 is set to a position inside the shaft end of the valve shaft 7 of the intake valve 2, and the rocker of the second selective transmission means 32 is set. Since the position of the second force point F <b> 2 with respect to the arm 62 is set to a position inside the shaft end of the valve shaft 8 of the exhaust valve 3, the solenoid 4 is disposed laterally in the center of the cylinder head 5. Therefore, the cylinder head 5 can be remarkably downsized. Further, since the number of expensive solenoids can be reduced, the weight can be reduced and the cost can be reduced.

  In the initial state of the valve drive system B, as shown in FIG. 5, the plunger 6 of the solenoid 4 is in the neutral position, and the intake valve 2 and the exhaust valve 3 close the intake port and the exhaust port. Then, in the exhaust stroke, as shown in FIG. 6A, the plunger 6 moves in the left direction in the figure, and the second selective transmission means 32 connected to the other end of the plunger 6 The joint point 32a moves in the left direction in the figure together with the plunger 6 while maintaining the corresponding angle (substantially right angle). At that time, the rocker arm 62 rotates counterclockwise, and the valve shaft 8 and the exhaust valve 3 are pushed down to open the exhaust port. On the other hand, the first selective transmission means 31 connected to one end of the plunger 6 is outward (counterclockwise) at a connection point 31a with the plunger 6 with respect to the leftward movement of the plunger 6 in the figure. , The rocker arm 61 is kept as it is, and the intake port is closed.

  On the other hand, in the intake stroke, as shown in FIG. 6B, the plunger 6 moves in the right direction in the figure, and the first selective transmission means 31 connected to one end of the plunger 6 is connected to the plunger 6. While maintaining the corresponding angle (substantially right angle) at the connection point 31a, it moves to the right in the figure together with the plunger 6. At that time, the rocker arm 61 rotates clockwise, and the valve shaft 7 and the intake valve 2 are pushed down to open the intake port. On the other hand, the second selective transmission means 32 connected to the other end of the plunger 6 faces outward (clockwise) at a connection point 32a with the plunger 6 with respect to the rightward movement of the plunger 6 in the figure. The rocker arm 62 is maintained as it is, and the exhaust port is closed.

  In this way, the single solenoid 4 can alternately drive the intake valve 2 and the exhaust valve 3 by the following configuration. That is, the first and second selective transmission means 31 and 32 are connected at their connection points 31a and 32a with the plunger 6 in the state of the first and second selective transmission means 31 and 32 shown in FIG. In addition, it is configured such that only outward rotation is permitted and no inward rotation is permitted from a state of being substantially perpendicular to the plunger 6 downward. In the connecting portion between the first and second selective transmission means 31 and 32 and the two rocker arms 61 and 62, although not shown, the pin shaft provided at the connecting portion between the rocker arm 61 and the rocker arm 62 is omitted. However, the first selective transmission means 31 and the second selective transmission means 32 rotate outwardly through a slot formed in the connecting portion of the first and second selective transmission means 31 and 32. It is configured to allow movement.

  Such a valve drive system B is composed of two intake valves (# In-1 and # In-2) and two exhaust valves (# Ex-1 and #Ex) as shown in Case II of Type II in FIG. When applied to a 4-valve engine with -2), two solenoids may be used. Since both of the solenoids can be arranged at the center of the cylinder head 5, the cylinder head 5 can be remarkably compact. In addition, the weight can be reduced and the cost can be reduced.

  Furthermore, as shown in case 3 of type II in FIG. 4, a single solenoid, two intake valves (# In-1 and # In-2) and two exhaust valves (# Ex-1 and # Ex- 2) can also be driven. In that case, two rocker arms that drive two intake valves (# In-1 and # In-2) are connected by one intermediate link and two exhaust valves (# Ex-1 and # Ex-2) are connected. ) Are connected by the other intermediate link, one intermediate link is connected to one end of the plunger via the first selective transmission means, and the other intermediate link is connected to the second intermediate link. What is necessary is just to connect with the other end of a plunger via 2 selective transmission means. In this way, the two intake valves (# In-1 and # In-2) and the two exhaust valves (# Ex-1 and # Ex-2) can be driven alternately. In this case, the cylinder head 5 can be significantly downsized. Further, since the number of expensive solenoids can be reduced, the weight can be reduced and the cost can be reduced.

  It should be noted that the present invention is not limited to the embodiments, and can be freely improved, changed, etc. as necessary, without departing from the gist of the invention, and combinations of configurations among the embodiments. Is also free.

  The intake / exhaust valve drive system for an internal combustion engine according to the present invention can be made compact for a cylinder head, and therefore can be suitably applied to a vehicle or the like that requires a compact engine room.

It is explanatory drawing which shows the principal part structure of the intake / exhaust valve drive system of the internal combustion engine which concerns on Embodiment 1 of this invention. It is typical explanatory drawing of the intake / exhaust valve drive system of another internal combustion engine, (A) shows a valve fully closed state, (B) shows a valve fully opened state. (A) is an explanatory view of the operation of the exhaust stroke, (B) is an intake stroke. It is explanatory drawing for demonstrating each valve operation mode in Embodiment 1 and 2. FIG. It is explanatory drawing which shows the principal part structure of the intake / exhaust valve drive system of the internal combustion engine which concerns on Embodiment 2 of this invention. (A) is an explanatory view of the operation of the exhaust stroke, (B) is an intake stroke.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Internal combustion engine 2 Intake valve 3 Exhaust valve 4 Solenoid 5 Cylinder head 51 Head cover A, B Valve drive system 6 Plunger 7, 8 Valve shaft 21, 22 Connection / separation means F1, F2 Power point 23, 24 Intermediate link 61, 62 Rocker Arm # In-1, # In-2 Intake valve # Ex-1, # Ex-2 Exhaust valve a Armature c, c1, c2 Coil J Connection point P1, P2 Fixed fulcrum T1, T2 Joint 31 First selective transmission means 32 2nd selective transmission means 31a, 32a Connection point p Pin shaft s Coil spring E Engine block

Claims (3)

An intake / exhaust valve drive system for an internal combustion engine in which a solenoid for driving an intake valve and an exhaust valve of the internal combustion engine is provided in a cylinder head,
Connection / separation means for selectively connecting or separating the plunger of the solenoid and the rocker arm for driving the intake valve or the exhaust valve is provided in a timely manner, and the force point of the connection / separation means with respect to the rocker arm An intake / exhaust valve drive system for an internal combustion engine, wherein the position is set to a position inside the shaft end of the valve shaft of the intake valve or the shaft end of the valve shaft of the exhaust valve.   An intermediate link is connected to the plunger, and the intermediate link and a rocker arm for driving the intake valve or a rocker arm for driving the exhaust valve are detachably connected by the connecting / separating means. The intake / exhaust valve drive system for an internal combustion engine according to claim 1. An intake / exhaust valve drive system for an internal combustion engine in which a solenoid for driving an intake valve and an exhaust valve of the internal combustion engine is provided in a cylinder head,
The solenoid is installed horizontally, and the both ends of the plunger of the solenoid are selectively connected to the rocker arm for driving the intake valve and the rocker arm for driving the exhaust valve in a timely and selective manner. The selective transmission means is provided, and the position of the force point of the selective transmission means with respect to the rocker arm is set to a position inside the shaft end of the valve shaft of the intake valve or the shaft shaft of the valve shaft of the exhaust valve. An intake / exhaust valve drive system for an internal combustion engine.

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