173 results about "Compression release" patented technology

A method and apparatus for carrying out variable timing exhaust gas recirculation is disclosed for use during both positive power and retarding operation of an internal combustion engine. Motion or energy is derived from an engine component and stored as potential energy. The stored energy is selectively applied to a valve actuator to carry out exhaust gas recirculation in an engine cylinder. The energy derived from the engine may be stored and selectively applied to the valve actuator with an electronically controlled trigger valve. The valve actuator may be a slave piston having an inner core and an outer sleeve capable of opening the valve of the cylinder in response to independent exhaust gas recirculation and compression release hydraulic systems.

A fuel injector is provided which has an injector body with a metallic tip having an outer surface. A non-metallic insulator, such as a ceramic, is attached to the tip and covers a portion of the outer surface. Injector tip overheating can be a problem, especially during sustained two-cycle boosted engine compression release braking. In addition, injector tip overheating can be a problem when an engine is experiencing simultaneous engine compression release braking and exhaust braking.

A variable valve actuation system for providing discrete exhaust and intake valve lift profiles for various operating modes of an internal combustion engine. The variable valve actuation system includes exhaust and intake rocker assemblies, exhaust and intake hydraulic extension devices operatively coupling corresponding rocker assemblies with respective engine valves and exhaust and intake control valves for selectively supplying the pressurized hydraulic fluid to the extension devices so as to independently switch them between a pressurized condition and a depressurized condition. The engine further includes an exhaust brake provided to initiate a small lift of the exhaust valve during the engine braking operation while the exhaust extension device maintains the exhaust valve open during a compression stroke for bleeder-compression release braking. The exhaust and intake valves can be adjusted independently to provide combinations of valve lift modes.

Systems and methods of actuating two engine valves associated with a common engine cylinder using one or more lost motion systems and one or more control valves are disclosed. The control valves are capable of selectively trapping hydraulic fluid in the lost motion systems for auxiliary engine valve actuations and selectively releasing the hydraulic fluid to default to cam controlled valve seating of the engine valves. The systems may provide a combination of main exhaust, compression release, exhaust gas recirculation and early exhaust valve opening in preferred embodiments.

Provided are a method and a device for manufacturing a rocking arm with a main piston and an auxiliary piston. A main piston hole and an auxiliary piston hole which are connected through a hydraulic channel are arranged in the rocking arm, the main piston is driven by using a braking boss on a cam, and the auxiliary piston is driven through hydraulic transmission to open at least one exhaust valve to achieve braking. During a braking process, an isometry section of a maximum braking lift of the braking cam is used, a retraction position of the main piston is kept, a hydraulic channel between the main piston hole and the auxiliary piston hole is closed, and a braking load on the auxiliary piston is transmitted to a braking support above the rocking arm. The main piston is further driven by an integrated exhaust boss on the cam, the main piston drives the rocking arm to move and be separated from the braking support, an oil discharging channel in the rocking arm is opened to discharge oil, the auxiliary piston is returned to the retraction position, and the exhaust valve is braked to move to a closed position. A compression releasing braking mechanism is integrated with the existing valve driving chain, braking load is borne by using the braking support, braking valve rise is reset, the braking load is reduced, and braking power is increased.

Space linkage pressing the release mechanism, through a rope linkage link mechanism to achieve locking and unlocking the tightening rod.Under the premise of maintaining the unchanged mechanical interface of the original rod type, the lock -up and unlocking the original firework cutter with the rope link mechanism to achieve the unlocking function.The agency overcomes the traditional pressure release agency at each pressure point to use a firework cutter (or other release power sources) to achieve the unlocking function, so it can reduce a large number of spacecraft firework cutters (or other power source unlocking unlockingThe number of devices) reduces costs. At the same time, the agency has a low impact load when unlocked, does not generate excess objects, and can achieve multiple tightening points and unlocking function.

An apparatus and method for effectuating multi-cycle engine braking is disclosed. The present invention controls the operation of the engine valves to permit more than one compression release event during a single engine operating cycle. The apparatus includes an assembly for operating at least one exhaust valve of an engine cylinder during a positive power operation. The apparatus further includes an assembly for operating at least one intake valve of the engine cylinder. The apparatus further including an assembly for operating the at least one exhaust valve during an engine braking operation.

The invention discloses a fusing type compression release mechanism and a release method thereof, wherein the release mechanism comprises a bearing rope, a heater, a fixed section, a separate spring and a separate section; the fixed section, the separate spring and the separate section are sequentially connected to the bearing rope; the separate spring is in compression state; the heater is placed on the bearing rope; two ends of the bearing rope defines the prolapse of the fixed section and the separate section; the release method comprises following steps: S91: connecting a main body structure to the fixed section and connecting a separate body to the separate section; S92: powering the heater and fusing the bearing rope; and S93: ejecting the separate body to the outside with the separate section under the effect of the separate spring. The fusing type compression release mechanism and the release method thereof has the advantages of light weight, simple structure, low cost and high reliability of releasing.

The invention belongs to the technical field of aerospace spaceborne antennas and particularly relates to an unfolding release device of a rod antenna. According to the technical scheme, the unfolding release device comprises the rod antenna (3), a compression release mechanism (2) and an unfolding locking mechanism (1); the compression release mechanism (2) comprises an installation base (201), a compression base assembly (202), a swing frame (203), an installation frame (204), a limiting supporting plate (205), a locking reed (206), a compression screw (207) and a pyrotechnic cutter (209); the unfolding locking mechanism (1) comprises an installation frame (101), a fixed hinge support (102), a volute spring (103), a limiting block (104), a locking leaf spring (105) and a rotating hinged head (106). According to the unfolding release device of the rod antenna, the rod antenna (3) can be unfolded to a fixed angle and can be effectively locked before and after the release.

A friction clutch assembly comprises a cover mounted on a flywheel of a driving shaft. A pressure plate has a contact surface for receiving a driving force from the driving shaft that is axially moveable between an engaged position and a disengaged position. A spring supported by the cover urges the pressure plate into the engaged position. Compression of the spring releases pressure on the pressure plate to permit movement of the pressure plate to the disengaged position. At least one spacer attached to the cover and flywheel has an external surface that engages the pressure plate upon rotation of the flywheel. The external surface of the spacer conforms to the contact surface of the pressure plate so that torque is transmitted between the flywheel and the pressure plate over at least a line of engagement of the spacer external surface and the pressure plate contact surface upon rotation of the flywheel. The cover may have a continuous curved surface with a varying radius of curvature over a length of the curve to resist deflection and prevent premature failure of the cover.

It is becoming more common for diesel engine cylinders to include an engine compression release brake that can utilize energy built up in the cylinder to provide additional braking for the vehicle. The present invention utilizes a software diagnostic test that is stored in an electronic control module to detect defects in the engine compression release brakes. In particular, the present invention operates a first portion of the engine cylinders in a power mode and a second portion of the engine cylinders in a braking mode and compares a resulting fuel injector response or engine response to an expected value to determine if one or more of the engine compression release brakes are performing as expected.

A compression release brake system 10 includes a hydraulic apparatus 12 for controllably opening at least one exhaust valve 14 of at least one cylinder 16 of an engine in response to motion of a cam actuator 12. The system 10 includes a master piston assembly 40 having a master piston 42 engageable with the cam actuator 12. The master piston 42 includes a compressible piston pin 56. A slave piston assembly 44 is hydraulically linked to the master piston assembly 40 and includes a slave piston 46 engageable with the at least one exhaust valve 14.

Function of a compression release brake system of a compression ignited engine with a plurality of cylinders in a motor vehicle is checked by driving a crank shaft of the engine to rotate at a constant speed without injection of fuel into the cylinders while for each cylinder, for the compression release brake system in an inactive state and then in an active state, measuring the torque to be applied for maintaining said speed in a position of said crank shaft where the torque would be influenced by the behavior of that cylinder by a correctly functioning action of said compression release brake system in an active state. The torque values obtained for each cylinder for the compression release brake system in inactive and active state are compared, and the function of the compression release brake system for each individual cylinder of the engine is determined based on the comparison.

The invention provides a glue material for run-flat tire supporting glue, a preparation method of the glue material and a run-flat tire. The glue material comprises, by weight, 30-50 parts of naturalrubber, 50-70 parts of rubidium butadiene rubber, 30-50 parts of carbon black, 10-30 parts of white carbon black, 2-4 parts of silane coupling agents, 2-7 parts of tackifying resin, 4-8 parts of active agents, 6-9 parts of vulcanizing agents or 1-3 parts of accelerants. The glue material is prepared by mixing the components except for the vulcanizing agents and the accelerants, performing short-time secondary mixing and finally performing final mixing. The supporting glue formed after vulcanizing the glue material for the run-flat tire supporting glue has good rigidity, a rim of the tire cannot touch the earth in deflation, the tire stably runs, has high flexing resistance and tearing resistance and cannot break in high-frequency compression release process, and the buffer performance of the tire is ensured.

A tool for the removal and replacement of valve springs on the cylinder head of an internal combustion engine while the cylinder head is either mounted to the engine block within the vehicle or is positioned on a work bench apart from the engine. The tool comprises a bracket component that is mounted by a number of bolts to the cylinder head to be worked on. The bracket includes a number of upright threaded bolts each associated with an adjacent upright guide. A pressure plate is progressively positioned on each set of the upright bolts and upright guides. Beneath the pressure plate are positioned two (or more) valve guides that engage the outer upper perimeter of two or more valve springs. A nut is threaded on to the upright bolt in a manner that forces the pressure plate and the valve guides downward onto the valve springs. Compression of the springs releases the split rings or collars that hold the valve springs to the valve stems. The end of the valve stems that incorporate the split ring attachment mechanisms are allowed to move upward into the valve guides while the perimeter of the spring is compressed. In this manner the split ring can be removed and the springs released upon removal of the nut from the threaded upright bolt. The pressure plate may then be moved to the next upright bolt on the bracket to effect removal of the adjacent set of valve springs.

An apparatus includes two compression plates arranged to compress a subject portion, and a compression release means arranged to move at least one of the two compression plates in a direction opposite to a direction in which the subject portion is compressed in a state in which the subject portion is compressed and power is not supplied.