269 results about "Valve gear" patented technology

A valve gear includes a valve (30), which controls a flow rate of a fluid and an opening of which is determined according to a rotational position of a valve element, an actuator (20) for providing a rotational force to a rotary valve shaft that changes the opening of the valve (30), and attaching/detaching means. The attaching/detaching means includes a locking element (32) formed at its prescribed positions with locking concave/convex portions and an engaging element (22) formed at its prescribed positions with engaging concave/convex portions. The locking element (32) and the engaging element (22) are relatively rotatable around the rotary valve shaft up to a prescribed angle, and prevent the actuator (20) from coming off the valve (30) at an engaging position where the engaging concave/convex portions and the locking concave/convex portions are engaged with one another, and allow the actuator (20) and the valve (30) to be detached from each other at a disengaging position.

A valve train for an internal combustion engine that uses motors to open/close intake valves of cylinders. The motors drive the intake valves for each of a plurality of groups of cylinders that perform an explosion stroke at substantially equal crank angle intervals. Since the intake valves are driven for each of the plurality of groups of cylinders that perform an explosion stroke at substantially equal crank angle intervals, the explosion stroke is performed regularly even when an operation is conducted with only a particular group of cylinders. This makes it possible to inhibit driveability deterioration.

A valve operating system for an internal combustion engine including a main valve lifter, a subsidiary valve lifter, a low-speed cam operating the main valve lifter, a high-speed cam operating the subsidiary valve lifter, a connecting device switched over between a non-connecting state in which the valve lifters are disconnected from each other, and a connecting state in which the valve lifters are connected to each other, a valve spring for biasing the valve in a closing direction, a lifter spring for biasing the subsidiary valve lifter toward the cam; thus, in a low-speed mode, that is non-connected states, an influence of a load of the lifter spring on the valve can be prevented, and in a high-speed mode, that is connected states, a sum total of loads of the valve spring and the lifter spring cap be applied to both of the valve lifters to improve the closing responsiveness of the valve.

In a gear case of a throttle body, a valve gear is fixed to one end of a throttle shaft, an intermediate reduction gear is rotatable around an intermediate shaft, a pinion gear is fixed to a motor shaft of a drive motor, and a full close position stopper is provided for defining the full close position of a throttle valve. Those are provided all in alignment with the longitudinal centerline of the gear case. For car models where the throttle body bore inside diameter is identical but the rotation direction of the drive motor differs, only some components in the gear case need be replaced and the other components in the gear case can be used as common components.

The variable valve gear for an internal combustion engine includes a cam lobe that is rotatably supported by a cam drive shaft, and a variable valve mechanism that includes a drive arm fixed adjacent to one end of the cam lobe in the cam drive shaft, an eccentric shaft member that is swivelably supported at a position opposite to the cam lobe with respect to the drive arm in the cam drive shaft, has an outer circumferential surface eccentric to an axis of the cam drive shaft, and is adjustable in eccentricity, and an intermediate rotary member that is rotatably supported through a bearing member around the eccentric shaft member, and is connected to the drive arm, wherein the drive arm includes an end face that overlaps with an end face of the bearing member, when projecting along the axis of the cam drive shaft, and the end face of the drive arm is protruding further than the end face of the cam lobe toward the bearing member.

A valve drive system of an engine includes a camshaft that is supported by a cylinder head of the engine and on which a plurality of cams having different valve lift characteristics are arranged at predetermined intervals, a rocker shaft that is supported by the cylinder head so as to be parallel or substantially parallel to the camshaft, and a rocker arm that is swingably supported by the rocker shaft. The rocker arm is arranged between one of the cams and an intake valve or an exhaust valve and is arranged so as to be movable in an axial direction of the rocker shaft. A presser of the rocker arm that presses the intake valve or the exhaust valve extends in the axial direction and has a length greater than an interval between the cams. The valve drive system includes a drive unit that moves the rocker arm toward one side or toward an opposite side in the axial direction by the interval between the cams.

A valve gear includes a camshaft having valve gear cams, first and second rocker shafts, a first rocker arm supported on the first rocker shaft, and a second rocker arm supported on the second rocker shaft: The valve gear cams, respectively, include a cam nose projecting from a base circle, and the first rocker shaft supporting the first rocker arm is positioned forwardly of a center line, which passes through a center of the camshaft to extend axially of a cylinder, in a direction of rotation of the camshaft:. The first rocker shaft is shifted closer to the camshaft than a center of rotation of a roller bearing is, when the roller bearing won the first rocker arm contacts with the base circle of the valve gear cam.

The present disclosure relates to an pneumatic hybrid internal combustion engine with at least one combustion chamber composed of a cylinder in which a piston is arranged mechanically interconnected to a crank shaft via a piston rod. An inlet valve and an exhaust valve are both mechanically interconnected via a valve gear to the crank shaft. The engine further includes at least one charge valve which is actuated by a charge valve actuator in a fully variable manner such that the engine can be operated in a four stroke hybrid mode.

A valve gear mechanism for an internal combustion engine, capable of changing valve-opening characteristics of a valve. The mechanism can smoothly change valve-opening characteristics by using a simplified structure without causing an increase in the number of parts and without causing an increase in sliding friction. A valve gear has a switching mechanism (24) for switching connection and disconnection between rocker arms (32, 34) arranged between a valve (18) and cams (14, 16). When a slide pin (58) reaches an displacement end (Pmax2) in the direction in which a slide pin (58) is retracted,the urging force of a return spring (56) acting on switching pins (48, 54L, 54R) is received by an engaging portion, formed between a notch (58e) provided in the slide pin (58) and a rock pin (70), with the engaging portion separated from a camshaft (12).

During the over-compression, high pressure refrigerant is released from a bypass hole. The sprayed pressure loss in inverse proportion to the cross section of the bypass hole is generated when the refrigerant passes through the bypass hole.The aim of the invention is to improve the compression efficiency of the over-compression region.The invention provides a scroll compressor equipped with two venting valve gears.The two venting valve gears are respectively arranged in two compression chambers closest to an ejection opening.The two compression chambers are paired chambers with respect to a voluted center.The two venting valve gears are arranged in an asynmmetric configuration with respect to the voluted center.At least one of the venting valve gears communicates with the injection outlet when the two compression chambers are under the following two states: one state is that the two compression chambers is about to communicate with the injection outlet; the other state is that the two compression chambers progress 180 degree and communicate with the injection outlet.

The present invention relates to a method for operating an internal combustion engine (51). The internal combustion engine (51) comprises a compressor (52) for setting a charge density (p_SGR) in an intake pipe of the internal combustion engine and adjusting means (53), for example variable valve gear, for setting a volumetric efficiency (lambda_Iota) of the internal combustion engine (51). In the method, a dynamic setpoint value (rl_dyn) is determined for the internal combustion engine (51) as a function of a difference between a load request (rl_soll) on the internal combustion engine (51) and a current load output (rl_ist) of the internal combustion engine (51). The volumetric efficiency (lambda_Iota) and the charge density (p_SGR) are set as a function of the dynamic setpoint value (rl_dyn).

Subject of the present invention is to provide a vortex compressor, which can inhibit by setting the overflow valve pressure of valve gear body pressure into the cause of fixed vortex plate deformation, and the inhibition caused by collision of retainer and valve pressure deformation of the body or a collision. Fixed vortex dish with overflow valve device, the pressure of compression chamber rises above to set pressure, open flow so that the compression chamber and pressure chamber connected from the overflow valve device is connected the overflow of the compression chamber and jet pressure chamber flow, overflow valve open and close the overflow flow, configuration between the relief valve and the retainer and the elasticity of the overflow valve is given according to the pressure of the valve pressure, limiting valve pressure of the moving range of retainer, the overflow valve closed state of the overflow mouth and open the overflow state of flow in any conditions, all press pressure the valve pressure by elastic body pressure against the retaining ring.

In an engine which comprises a first intake valve and a second intake valve for each cylinder, configured to be driven by a first intake cam and a second intake cam, respectively, and a cam phase change mechanism configured to vary the phase of the second intake cam, the cam phase change mechanism is controlled so that the opening timing of the second intake valve is advanced ahead of that of the first intake valve in a start mode.

The invention discloses a microfluid valve gear based on electrowetting technology. The microfluid valve gear comprises an upper substrate, a lower substrate and a microfluid interlayer. The microfluid interlayer is positioned between the upper substrate and the lower substrate. An upper conducting layer (13) and a lower conducting layer (14) are respectively arranged on one side of the upper substrate (11) and the lower substrate (12) close to the microfluid interlayer (10), an upper dewatering dielectric layer (15) is arranged on a lower surface of the upper conducting layer (13), and a lower dewatering dielectric layer (16) is arranged on an upper surface of the lower conducting layer (14). The microfluid interlayer (10) is made of porous spongy material. The outer surface and the interior structure surface of the microfulid interlayer (10) are both covered by a medium dewatering dielectric layer (17). Voltage is applied between the microfluid interlayer and a certain substrate, so that waterborne fluid between the substrate and the interlayer is filtered to the other side of the interlayer by the aid of electrowetting property. Correspondingly, voltage is applied between the other substrate and the interlayer, so that the waterborne fluid can be filtered back to the original side, and accordingly a dynamic and adjustable fluid valve function can be achieved.

To simplify a circuit structure and a path structure in a hydraulic circuit having a pilot check valve and an overload relief valve and to reduce the size of a gear. The hydraulic circuit includes a pump port; a tank port; a first actuator port; a second actuator port; a first supply and discharge port; a second supply and discharge port; a direction changing valve; a first pilot check valve; a second pilot check valve; a first pilot path; and a first overload relief valve. The direction changing valve has a neutral position to communicate the first supply and discharge port with the tank port. The first overload relief valve is arranged in parallel with the first pilot check valve and is arranged between the first supply and discharge port and the first actuator port.

A cam element portions is configured such that respective maximum lift portions (lift ending points) of both-side end-face cams thereof are provided at respective phases which are different from each other in a rotational direction and that a maximum value of a length, in an axial direction, between respective cam faces of the both-side end-face cams which are provided at the same phase is set to be a distance, in the axial direction, between a first operational member and a second operational member or smaller. Accordingly, in a valve gear of an engine in which cams operative to control opening/closing of a valve are switchable, it can be properly prevented that a camshaft locks and stop rotating because of an operational malfunction of an operational member or the like.

In an engine with a cam phase change mechanism which is disposed on one end portion of an intake camshaft and variably changes a phase of a drive cam of an intake valve relative to a crankshaft, the cam phase change mechanism is configured so that two vane-type hydraulic actuators of which variable-phase torques produced at the same supplied oil pressure are different are arranged axially relative to the intake camshaft.

A valve gear box has a valve monitoring function. The valve gear box is for mounting to a valve that has a fluid passageway and a gate therefor, the gear box providing a gear driven link for moving the gate between open and closed conditions of the fluid passageway, the valve gear box being in a housing that has a mounting for permitting operative connection to the valve via a mounting flange of the valve. The mounting and the mounting flange have a valve monitoring sensor operatively positioned therewith, the sensor being settable in one state when the mounting and the mounting flange are in assembled relationship to each other but being configured to change from the one state if there is a separation of the fastened connection of the mounting and the mounting flange, whereby a change in state from the one state can be used to monitor a separation of the assembled relationship of the mounting and the mounting flange and trigger an alarm condition.

A valve gear of an engine is constituted so that a rocker arm 63 having a cam abutting part 65 abutting on a valve system cam 69 and interlocked and connected so as to apply valve opening directional force to the engine valve 19 energized in the valve closing direction by a valve spring 24, is rotatably connected with one end part of a first link arm 61 rotatably supported by a fixing position of an engine body and the other end part of a second link arm 62 rotatably supported by a displaceable movable shaft 68a; and the rocker arm 63 is energized in the direction for allowing the cam abutting part 65 to abut on the valve system cam 69 by a rocker arm energizing spring 54 separate from the valve spring 24. This ensures follow-up ability of the opening/closing operations and enables a reduction in the size of the system, while allowing the lift amount of the engine valve to vary continuously. It is also possible to improve the accuracy with which the lift amount is controlled when the engine valve is to be slightly opened.

Provided is a lubricant feed mechanism for an engine in which space above a cam cap is not used. A lubricant feed mechanism for an engine is configured to feed lubricant through a cylinder head, a camshaft, and a cam cap to a cam of a valve gear. The mechanism includes an oil feed member that is disposed in the cam cap such that an upper end thereof is set at a lower level than an upper end of the cam cap in a height-wise direction and has an oil passage configured to guide lubricant to be fed through the cam cap to the cam.