92 results about "Valvetrain" patented technology

A rocker arm system for an internal combustion engine valvetrain includes a base member, a first rocker arm, a second rocker arm, and a saddle. The base member includes a first tower having a first tower recess, a second tower having a plurality of saddle mounting holes, a third tower having a third tower recess, a first rocker gap between the first tower and the second tower, and a second rocker gap between the second tower and the third tower. Each rocker arm includes an arm with a shaft extending through a shaft hole in the arm. A first tower recess central axis and a third tower recess central axis form a first angle having a measurement in a range of between 0° and 25°. The saddle is configured to connect to the second tower by passing a plurality of fasteners through plurality of corresponding saddle through holes in the saddle and into a plurality of corresponding saddle mounting holes in the second tower.

An oil distribution system for an internal combustion engine valvetrain includes a rocker arm base member and a base plate. The rocker arm base member includes a distribution slot disposed into a base lower surface, a plurality of receiving holes extending from a sidewall and / or from the base upper surface of the rocker arm base member into the distribution slot, and a plurality of oil distribution holes passing from the distribution slot through the base upper surface. The base plate being configured to cover at least a portion of the base lower surface including at least a portion of the distribution slot. In operation, the distribution slot receives oil from the plurality of oil receiving holes, passes at least a first portion of the oil to the plurality of oil distribution holes, and the plurality of oil distribution holes discharge at least a second portion of the oil past a base upper surface to provide lubrication to a portion of a rocker arm or other valvetrain components.

The invention discloses an engine hydraulic variable valve mechanism, an engine and a method, and solves the problem that in the prior art, a piston and a tappet do not move synchronously, so that the valve closing angle is greatly changed along with the change of the rotating speed when a valve mechanism is partially opened. The hydraulic variable valve mechanism of the engine has the beneficial effect that the closing angle of the valve cannot be advanced along with the change of the rotating angle of the crankshaft at different rotating speeds, according to the specific scheme, an oil drainage hole is formed in the side, close to a piston, of a shell, the piston blocks the oil drainage hole, and the oil drainage hole can be communicated with a piston cavity in the moving process of the piston in the piston cavity; a slide valve is arranged at the oil drainage hole, is arranged between the tappet and the piston through the shell and can be communicated or disconnected with the low-pressure cavity, the control oil way is provided with a power-off normally-closed electromagnetic valve, the power-off normally-closed electromagnetic valve controls the slide valve, when the power-off normally-closed electromagnetic valve is powered off, the slide valve cuts off the high-pressure cavity and the low-pressure cavity, and when the power-off normally-closed electromagnetic valve is powered on, the high-pressure cavity is communicated with the low-pressure cavity. And the air valve is in a partial opening state.

A valvetrain control system includes a rocker shaft that attaches to an engine assembly and includes an internal bore that receives hydraulic fluid. An oil control valve (OCV) is attached to the rocker shaft and fluidly coupled to the internal bore to receive therefrom hydraulic fluid. Pivotably mounted onto the rocker shaft is a rocker arm with opposing ends thereof that mate with a pushrod and a valve. The rocker arm includes a spring lock unit that attaches to the pushrod and fluidly couples to the OCV to receive hydraulic fluid and thereby drivingly disengage the rocker arm from the pushrod. An insert sleeve mounted in the internal bore receives hydraulic fluid from the rocker shaft. The insert sleeve includes a feed port that transmits hydraulic fluid from the insert sleeve to the OCV, and a feed pocket that transmits hydraulic fluid from the OCV to the spring lock unit.

A synchronizing system in a valvetrain assembly. A first rocker arm comprises a deactivating roller, the deactivating roller configured to be selectively switchable between a latched position and an unlatched position. A second rocker arm comprises an engine brake capsule, the engine brake capsule configured to be selectively translatable between a retracted position and an extended position. A first switching mechanism is arranged in the first rocker arm and configured to move between a first position and a second position to controllably switch the deactivating roller between the latched position and the unlatched position. A second switching mechanism is arranged in the second rocker arm and configured to move between a third position and a fourth position to controllably translate the engine brake capsule between the retracted position and the extended position. A single actuation source is configured to synchronously control (a) movement of the first switching mechanism from the first position to the second position and (b) movement of the second switching mechanism from the third position to the fourth position.

In an opposed-piston mechanism, an intake compression cylinder and an expansion exhaust cylinder are individually provided, and a rotating perforated columnar valve and an ignition combustion chamber are formed therebetween. A valve mechanism is arranged on a cylinder side surface side, and a disk cam that moves in conjunction with crank rotation operates an intake valve and an exhaust valve on a cylinder side surface via a movable fulcrum type rocker arm. A movable structure of the rocker arm also realizes opening / closing amounts of the intake valve and the exhaust valve according to an operating situation of an engine. Since a piston pin and a piston pin can absorb variations of an engine that occur when two connecting rods are connected to one piston, the two connecting rods can be easily connected to the one piston.

The present invention addresses the problem of providing an engine control device capable of performing retreat travel while suppressing excessive temperature rise of a catalyst even when an abnormality occurs in a variable valve mechanism. An engine control device that is mounted in a vehicle and purifies exhaust gas by a catalyst, the engine having a variable valve mechanism capable of changing a valve overlap period during which both an intake valve and an exhaust valve are opened, the engine control device being provided with: a determination unit that determines whether the intake valve and the exhaust valve are open or not; determining whether or not an abnormality has occurred with respect to an operation of the variable valve mechanism for reducing the valve overlap period; and an injection control unit that, when the determination unit determines that the fuel injection amount is positive, increases the fuel injection amount compared to when the determination unit determines that the fuel injection amount is negative.

A valve train control system comprises a rocker arm shaft mounted to an engine assembly and featuring an internal bore that receives hydraulic fluid. An oil control valve (OCV) is mounted on the rocker arm shaft and is fluid-connected to the internal bore to receive hydraulic fluid. A rocker arm is pivotally mounted on the rocker arm shaft, its opposite ends mating with a pushrod and a valve. The rocker arm includes a spring-loaded locking assembly attached to the pushrod and fluid-connected to the OCV to receive hydraulic fluid and thereby release the rocker arm from the pushrod. An insert sleeve mounted in the internal bore receives hydraulic fluid from the rocker arm shaft. The insert sleeve includes a feed port that transfers hydraulic fluid from the insert sleeve to the OCV and a feed pocket that transfers hydraulic fluid from the OCV to the spring-loaded locking assembly.

The present invention provides a lubrication structure for an internal combustion engine that ensures the supply of lubricating oil to the valve train sliding members and suppresses the progression of wear as much as possible. [Solution] A lubrication structure 1 for an internal combustion engine comprising a camshaft 4 supported by a camshaft housing 5 and a cam cap 6, a valve member 8 having a valve guide 10 that supports a valve 9 that opens and closes when pressed by a cam portion 4', lubricating oil 3 supplied to the valve member 8, and an oil pump for supplying the lubricating oil 3, wherein an oil passage for supplying the lubricating oil 3 to the valve guide 10 by the oil pump is formed in at least one of the camshaft housing 5 and the cam cap 6, and at least one outlet portion 18 of the oil passage is formed in the side portion 19 parallel to the central axis of the cylinder on at least one of the camshaft housing 5 and the cam cap 6, and the lubricating oil 3 that is scattered from the outlet portion 18 is supplied toward the valve guide 10 so that it is scattered downward below the cam portion 4'.

A rocker arm assembly capable of switchably deactivating a roller assembly includes a valve end and a cam end having first and second roller assemblies, and a latching mechanism. The latching mechanism includes rocker body pins and roller body pins. The rocker body pins include first and second end pins and a connection pin, each pin provided within a rocker arm body along a latching axis. The roller body pins include first and second locking pins, each roller body pin provided within a respective roller assembly. In a first latching mode, the first roller assembly is deactivated and the second roller assembly is activated. In a second latching mode, the second roller assembly is deactivated and the first roller assembly is activated.

An electromechanical valve (10), comprising in a housing (20), a valve mechanism. The valve mechanism comprises a core (34) of magnetizable material surrounded by a coil (32) to be supplied with excitation current, a stack (36) of plates of magnetic material secured in a first end thereof, and a valve seat (38). The stack (36) of plates is provided in a space between the core (34) and the valve seat (38) to open / close the valve in response to an excitation current supplied to said coil (32) by displacing the stack (36) of plates from the valve seat when excitation current is supplied to the coil (32), the stack of plates providing a return spring force when the stack of plates is attracted to by an energized coil, wherein the core (30) is plate shaped and less than 3 mm thick.

Method for testing a valve train device with a carrier shaft (11) and with a first cam element (12) mounted on the carrier shaft (11) in a rotationally fixed but axially displaceable manner and with a second cam element (13) mounted on the carrier shaft (11) in a rotationally fixed but axially displaceable manner for an internal combustion engine, in which a backlash of a splined connection between the carrier shaft (11) and the cam elements (12, 13) penetrated by the carrier shaft (11) is determined by rotating the carrier shaft (11) relative to the first cam element (12) with a predetermined torque, measuring an angle of rotation and determining the backlash from the angle of rotation, and rotating the carrier shaft (11) relative to the second cam element (13) with a predetermined torque.a rotation angle is measured and the torsional clearance is determined from the rotation angle, a tolerance range for the torsional clearance is defined for the evaluation of the valve train device, and the torsional clearance is determined for all cam elements (12, 13) connected to the carrier shaft (11).

Cover structure of an internal combustion engine, comprising: an engine body (7) comprising a crankshaft (15), a camshaft (9, 10) and a variable valve mechanism (51, 53) which changes a relative rotational phase of the camshaft (9, 10) with respect to the crankshaft (15); and a cover component (18) attached to an end section (11a, 12a) of the motor body (7), the cover component (18) comprising a cover section (19) covering the end section (11a, 12a) of the motor body (7), comprising a first side wall section (19A) and a second side wall section (19B) provided in a width direction of the cover section (19) on both sides of the cover section (19) and attached to the end section (11a, 12a) of the motor body (7), and comprising an opening section (19a) formed in the cover section (19) and provided such that a drive device (52) which drives the variable valve mechanism (51, 53) is attached, the cover component (18) includes: a projecting section (30) extending from the cover section (19) towards the motor body (7), wherein the projecting section (30) comprises a fastening projecting section (30A) which is attached with a fastening means (20C) which fastens the cover element (18) to the motor body (7); a first reinforcing section (41) provided on the cover section (19) such that it extends from the fastening projection section (30A) in a direction different from the width direction of the cover section (19), and which is connected to a third side wall section (19u) of the cover section (19) provided at a position different from the positions of the first side wall section (19A) and the second side wall section (19B); and a second reinforcement section (42) which is provided on the cover section (19) such that it extends from the fastening projection section (30A) in the width direction of the cover section (19) and which is connected to the first side wall section (19A), and wherein the opening section (19a) is surrounded by the projection section (30), the first reinforcement section (41), the third side wall section (19u), the first side wall section (19A) and the second reinforcement section (42).

A rocker arm includes a hydraulic actuator piston slidably disposed in an actuator bore. An actuator spring is configured to bias the hydraulic actuator piston out of the actuator bore and contact with a valve train component or at least one engine valve, wherein reaction of the hydraulic actuator piston on the valve train component or the at least one engine valve biases the motion receiving portion of the rocker arm into contact with a valve actuation motion source. In an unactuated state of the hydraulic actuator piston, hydraulic fluid is allowed to flow out of the actuator bore, and in an actuated state of the hydraulic actuator piston, hydraulic fluid is locked in the actuator bore.

The invention discloses a waste gas bypass valve structure and a turbine box of a turbocharger, the waste gas bypass valve structure is applied to the turbine box of the turbocharger, and the waste gas bypass valve structure comprises a deflation valve mechanism; the deflation valve mechanism comprises a deflation valve and an adjusting ring; the deflation valve is located on the inner side of the annular adjusting ring; the deflation valve is arranged corresponding to an outlet of an original turbine box deflation channel of the turbine box; the deflation valve is used for opening or closing an outlet of the deflation channel of the turbine box; adjusting ring exhaust holes are formed in the adjusting ring in the radial direction in a penetrating mode. The adjusting ring exhaust hole is used for being communicated with an outlet of the turbine box exhaust channel when the exhaust valve is opened. The exhaust valve mechanism is scientific in design, the exhaust flow passing through the exhaust valve mechanism (comprising the exhaust valve and the adjusting ring) can be flexibly adjusted under the condition that the overall structure of an exhaust bypass valve (namely the exhaust valve) is not changed, the energy adjusting performance of a turbocharger is improved, and excessive loss of bypass airflow is effectively avoided.

This invention discloses an intake and exhaust control mechanism and a four-stroke high-power valve incorporating the mechanism, including a valve, a rocker arm for driving valve opening and closing, a cam, and a transmission assembly connecting the cam and the rocker arm; it also includes a lift adjustment assembly and a buffer assembly; the transmission assembly includes an axially extendable tappet, the bottom end of which rolls in contact with the cam, and the top end of which abuts against one end of the rocker arm; this invention belongs to the technical field of internal combustion engine valve train mechanisms, and its purpose is to solve the problems of fixed or discontinuous lift adjustment, large impact under high load, and mismatched buffer characteristics in existing valve mechanisms. The technical effect achieved is: by driving the tappet to extend and retract through a threaded adjusting pair and a bevel gear transmission pair, stepless adjustment of valve lift is realized, which reduces the lift and enhances swirl under low load, and increases the lift and improves charging efficiency under high load, while the thread self-locking ensures stable adjustment and optimizes intake and exhaust performance under all operating conditions.

The invention relates to a method for producing a roller tappet (44) for a pump or valve train of an internal combustion engine, comprising a cylindrical housing (43) for guiding a longitudinal movement of the roller tappet (44) in a bore of the internal combustion engine, the cylindrical blank (1) of the housing (43) being produced in a lightweight design and having at least one flattened section (5, 6, 7, 8) on the outer diameter, at least one edge (11 to 18) formed on the outer diameter of the blank (1) in an intermediate region between the axial ends of the blank (1) is subjected to a low-notching deburring treatment by turning. The invention also relates to a forming tool (31, 34, 36) for producing a roller tappet (44) in such a method. The invention also relates to a roller tappet (44) having a lightweight structure produced by such a method.

The invention relates to an internal combustion engine (4) for a motor vehicle, with at least one combustion chamber to which at least one gas exchange valve (2) is assigned, and with a variable valve train (1) by means of which the gas exchange valve (2), whose stroke can be varied by means of the variable valve train (1), can be actuated. The valve train (1) comprises a camshaft (3) rotatable about a camshaft axis of rotation (ND) with at least one cam (5).An intermediate device (7) is provided, which has a cam follower (8) that rests against an outer contour (6) of the cam (5) during each rotation of the camshaft (3) about the camshaft rotation axis (ND) and can be actuated via the cam follower (8) by means of the outer contour (6) of the cam (5) during each rotation of the camshaft (3) about the camshaft rotation axis (ND), whereby the gas exchange valve (2) can be actuated via the intermediate device (7) by means of the outer contour (6) of the cam (5).

The invention relates to an internal combustion engine (1) with a combustion chamber (8) which is fluidically connected to a flow channel (10) via a gas exchange valve (12), and with a valve train (13) which has a camshaft with at least one valve actuating cam (15) for actuating the gas exchange valve (12), wherein the gas exchange valve (12) has a valve stem (19) and a valve disc (21), and wherein the valve disc (21) provides a first flow cross-section in a first valve disc position and a second flow cross-section different from the first flow cross-section through a valve seat in a second valve disc position, wherein the valve disc (21) is pivotably mounted in such a way thatthat the valve disc (21) is arranged in a first pivot angle position when the valve stem (19) is in a first pivot angle position and in a second pivot angle position when the valve stem (19) is in a second pivot angle position different from the first pivot angle position, wherein the valve disc (21) is rotatably mounted on the valve stem (19) by means of a pivot joint (23) about an axis of rotation and pivotably mounted on a cylinder head (7) receiving the flow channel (10) by means of a pivot joint (25), wherein the pivot joint (25) comprises a first pivot joint (27) and a second pivot joint (28).

The invention pertains to a valve bridge (42) for a valve train (10) of an internal combustion engine, having a bridge actuation area (44), via which the valve bridge (42) can be actuated by means of a first rocker lever (32) of the valve train (10) and can thus be moved in translational motion in a first direction of movement (22), having a first valve actuation area (46), via which, by actuating the valve bridge (42), a first gas exchange valve (18) of the internal combustion engine can be actuated by means of the valve bridge (42), and with a second valve actuation area (48), via which, by actuating the valve bridge (42), a second gas exchange valve (20) of the internal combustion engine can be actuated by means of the valve bridge. The valve bridge (42) comprises a bridge center part (45) forming the bridge actuation area (44), a first bridge part (52) forming the first valve actuation area (46), a guide part (54) projecting from the bridge center part (45) and from the first bridge part (52) along a longitudinal extension direction (50) extending perpendicularly to the first direction of movement (22) and which is movable with the bridge center part (45) and with the first bridge part (52), and a second bridge part (58) formed separately from the bridge center part (45), separately from the first bridge part (52) and separately from the guide part (54), and forming the second valve actuation area (48), the second bridge part having a reception orifice (60) in which the guide part (54) engages.

The internal combustion engine system includes an engine having a plurality of pistons housed in each of a plurality of cylinders. A valvetrain is provided for opening and closing intake and exhaust valves of the cylinders during nominal engine operation. The valvetrain is also configured to provide asynchronous switching between selected cam lobe lift profiles for opening and closing the intake and / or exhaust valves.

This invention discloses a hydraulic variable valve mechanism and method for engines, relating to the field of engine technology. It solves the problem of excessively advanced valve closing angle at low speeds in existing valve mechanisms, and has the beneficial effect of being applicable to late Miller cycles. The specific solution is as follows: A hydraulic variable valve mechanism for engines includes a drain hole on the side of a tappet, one end of which penetrates the top of the tappet and is connected to a high-pressure oil circuit. A housing has a drain groove on the side of the tappet, and the drain hole can communicate with the drain groove. A circumferential oil passage groove is provided for the spool valve. An opening is provided in the housing. When the spool valve is working and during the tappet movement, the drain hole, the drain groove, the oil passage groove, and the opening can all be connected. The transfer piston includes a throttling buffer component. The throttling buffer component has a circumferential recess to accommodate hydraulic oil. The throttling buffer component can perform reciprocating linear motion to adjust the communication area between the circumferential recess and the opening.

The present invention relates to a valve bridge (42) for a valve mechanism (10), comprising: a valve bridge operating area (44) through which the valve bridge (42) can be operated by means of a first rocker arm (32) and thereby movable in a first operating direction (22); a first valve operating area (46) by means of which a first valve valve (18) can be operated by means of the operation of the valve bridge (42); and a second valve operating area (46) by means of which a second valve valve (20) can be operated by means of the operation of the valve bridge (42). The valve operating area (46) includes a through hole (56) extending along the first operating direction (22), the through hole having a first length region (L1) within which the through hole (56) is completely closed around its circumference (58). The through hole (56) has a second length region (L2) that is immediately adjacent to the first length region (L1) in the operating direction (22), and in the second length region, the through hole (56) is opened at a portion (S1) along its circumferential direction (58) in a first opening direction (60) that extends perpendicular to the operating direction (22).

Cover structure of an internal combustion engine (5), comprising: an engine body (7) including a crankshaft (15), a camshaft (9, 10) and a variable valve mechanism (51) that changes a relative rotational phase of the camshaft (9, 10) with respect to the crankshaft (15); and a cover member (18) attached to an end portion (11a, 12a) of the motor body (7), wherein the cover member (18) includes a cover portion (19) covering the end portion (11a, 12a) of the motor body (7), a first side wall portion (19A) and a second side wall portion (19B) provided on both sides of the cover portion (19) in the width direction and fixed to the end portion (11a, 12a) of the motor body (7), and an opening portion (19a), the cover structure being characterized in that the opening portion (19a) is formed at a position offset to the side of the first side wall portion (19A) in the width direction of the cover portion (19) in the cover portion (19) and is provided to accommodate a drive device (52) that drives the variable valve mechanism (51), wherein the cover member (18) includes a projection portion (30) extending from the cover portion (19) toward the engine body (7) and connected to the engine body (7), and a mounting attachment portion (22) provided on the cover portion (19) so as to be located on the side opposite to the opening portion (19a) in the width direction of the cover portion (19) and provided so as to attach a mounting member (3R) provided in a vehicle body (2R), wherein the mounting attachment portion (22) is provided between the opening portion (19a) and the second side wall portion (19B) in the width direction of the cover portion (19), wherein an upper end portion (22u) of the mounting attachment portion (22) is provided above the cover portion (19) with respect to a lower end portion (19g) of the opening portion (19a), and wherein the projection portion (30) is provided so as to overlap with the opening portion (19a) in the width direction of the cover portion (19) and is connected to the mounting attachment portion (22).

A valve train component for conveying valve actuation motions within an internal combustion engine is provided, which valve train component comprises a body member having a bore formed therein; a sliding member disposed in the bore; and an overload feature operatively connected to the body member and the sliding member. The overload feature is configured to not yield when a load placed on the overload feature is less than a load threshold, thereby preventing movement of the sliding member into the bore, and to yield when a load placed on the overload feature meets or exceeds the load threshold, thereby permitting movement of the sliding member into the bore such that at least a portion of the valve actuation motions is not conveyed by the valve train component.

The invention relates to an intermediate rocker arm of a variable-stroke valve train of an internal combustion engine, comprising two side walls which project from a lower part connected thereto at a longitudinal end and which have two bores at the other longitudinal end, in which bores a shaft carrying a support roller is arranged, and which have two receptacles in the longitudinal intermediate region thereof, a pin is accommodated in the accommodating part, the pin carries a roller for contacting the lift cam on the front longitudinal end side of the middle rocker arm, the lower part enables the middle rocker arm to be extended on the front and rear longitudinal end sides of the middle rocker arm through a supporting foot piece extending from the side wall, and the outer side of the middle rocker arm is provided with a groove rail for contacting with the valve driving rocker arm. Wherein a contact surface for contacting with a transversely acting spring finger of a cam return spring of the intermediate rocker arm is arranged on the rear longitudinal end side in one longitudinal end part, and the contact surface is directly formed on the longitudinal end surface, located on the rear longitudinal end side, of the side wall.

The invention relates to a variable valve lift valve mechanism which comprises a cam assembly arranged on a cam shaft, and the cam assembly comprises a main cam and an auxiliary cam; the rocker arm assembly is arranged on the rocker arm shaft and comprises a main rocker arm linked with the main cam and an auxiliary rocker arm linked with the auxiliary cam; the maximum lift of a main valve lift line type generated by matching of the main cam and the main rocker arm is different from the maximum lift of an auxiliary valve lift line type generated by matching of the auxiliary cam and the auxiliary rocker arm. The valve assembly is connected with the auxiliary rocker arm; the invention discloses a plunger locking assembly. According to the variable valve lift valve mechanism, through collaborative optimization design of the two linear types, a complete buffer section can be provided in the first state of the main valve lift linear type and the second state of the auxiliary valve lift linear type, and it is guaranteed that the complete buffer effect is achieved in the valve opening and closing processes; therefore, the common impact problem in a traditional variable valve mechanism is effectively avoided, and the valve movement is more stable.

The invention relates to a roller rocker arm (9) for a valve train (2) of an internal combustion engine (1), with a rocker arm housing (14) on which a rocker arm roller (17) is rotatably mounted about a roller pivot axis (18) and which has, on the one hand, a valve connection point (12) for connection to a gas exchange valve (7) of the valve train (2) on the other hand, a bearing point (10) for mounting on an abutment (11) of the valve train (2) on the other hand, the rocker arm housing (14) having a housing base (15) and housing walls (16) extending from the housing base (15) on both sides of the rocker arm roller (17) and guide projections (21) extending from the housing walls (16) in the direction of the rocker arm roller (17), which are arranged to bear against roller side walls (24) of the rocker arm roller (17).The invention provides that the guide projections (21) are only present on one side of the roller pivot axis (18) facing the valve connection point (12). The invention further relates to a method for manufacturing a roller rocker arm (9) for a valve train (2) of an internal combustion engine (1) and to a valve train (2) for an internal combustion engine (1).

The application discloses an engine, comprising: a cylinder head; an intake and exhaust mechanism, comprising an air intake mechanism and an air exhaust mechanism, the air intake mechanism is used for air intake of the engine, and the air exhaust mechanism is used for air exhaust of the engine; a cam mechanism; a crankcase, which is formed with a second containing space; a crankshaft connecting rod mechanism, which is at least partially arranged in the second containing space; a balance mechanism, which is at least partially arranged in the second containing space and connected with the crankshaft connecting rod mechanism; the engine further comprises: a throttle mechanism, the throttle mechanism comprises: a main channel, which is connected with the air intake mechanism and used for controlling air input to the air intake mechanism; and a throttle channel, which is integrally formed with the main channel and at least partially communicates with the main channel. The application has the beneficial effect that: the throttle mechanism can be arranged as an integrally formed piece, thereby avoiding the leakage risk caused by poor connection, aging and other problems, and improving the sealing performance of the throttle mechanism.

To provide an internal combustion engine that appropriately performs combustion during a switching operation of a variable valve train in the internal combustion engine including the variable valve train.SOLUTION: An internal combustion engine 1 includes: a variable valve train for changing opening / closing timing of an intake valve; a main combustion chamber 40; an auxiliary combustion chamber 42; a first ignition plug 61 disposed in the main combustion chamber 40; a second ignition plug 62 disposed in the auxiliary combustion chamber 42; and a control device 50 that controls the first ignition plug 61 and the second ignition plug 62. The control device 50 switches an ignition form to either of SI ignition by using the first ignition plug 61, JET ignition by using the second ignition plug 62 or SI+JET ignition by using the first ignition plug 61 and the second ignition plug 62 along with change of the opening / closing timing of the intake valve by using the variable valve train.SELECTED DRAWING: Figure 2