Abstract: A linear drive apparatus including: a housing. Located inside the housing are an electric motor, a transmission gear, which meshes with an output gear on an output shaft of the electric motor, a gear shaft, and a linear motion assembly. The transmission gear is mounted on the gear shaft, the linear motion assembly is mounted to cooperate with the transmission gear, and converts rotational motion of the transmission gear to linear motion. An axis of the linear motion assembly is arranged in the same plane as an axis of the electric motor output shaft and an axis of the gear shaft. The linear drive apparatus has the advantages of a compact structure, small volume, light weight, and good heat dissipation.

Abstract: A database system comprises a persistent storage device, a log node including a memory and a processor, and a plurality of database nodes. A database node includes a cache memory configured to store a database instance, and a processor configured to initiate a database transaction by sending a snapshot request to the log node, the snapshot request including a list of pages that were either replaced or newly loaded in the cache memory. The log node processor is configured to send a snapshot response to the database node, wherein the snapshot response includes a snapshot of the database and a list of changed pages of the database instances. The database node processor is configured to update the status of the pages in cached memory according to the snapshot response and perform the database transaction.

Abstract: A sealing system for an exhaust gas recirculation valve, the exhaust gas recirculation valve including a housing and a valve stem disposed in the housing, the sealing system being disposed between the housing and the valve stem in order to prevent exhaust gas from entering a valve body interior. The sealing system includes at least two sealing assemblies. An exhaust gas recirculation valve includes the sealing system, and the sealing system effectively prevents exhaust gas from leaking into the valve body interior, and effectively prevents carbon deposits from sticking to the valve stem or entering the valve body interior, so as to increase the lifespan and reliability of the exhaust gas recirculation valve.

Abstract: A linear drive apparatus including: a housing. Located inside the housing are an electric motor, a transmission gear, which meshes with an output gear on an output shaft of the electric motor, a gear shaft, and a linear motion assembly. The transmission gear is mounted on the gear shaft, the linear motion assembly is mounted to cooperate with the transmission gear, and converts rotational motion of the transmission gear to linear motion. An axis of the linear motion assembly is arranged in the same plane as an axis of the electric motor output shaft and an axis of the gear shaft. The linear drive apparatus has the advantages of a compact structure, small volume, light weight, and good heat dissipation.

Abstract: A cam gear for a linear drive device that transforms a rotational movement of a first component into a linear movement of a second component includes a cam trench, having, in a circumferential direction of the cam gear, a first end portion and a second end portion, the cam trench being arranged on an end face of the cam gear. The cam gear is configured as a sector gear, and at least one of the first and second end portions of the cam trench is open.

Abstract: A linear drive device includes: a motor; a speed-reducing transmission stage having: a pinion gear fixedly connected to an output shaft of the motor, and a transmission gear meshing with the pinion gear; a linear transmission stage configured to transform a rotational movement of the transmission gear into a linear movement of an output connecting rod, the output connecting rod being received in a sleeve member so as to only move linearly; a spiral trench arranged on the transmission gear; and a follower received in the spiral trench so as to be movable in the spiral trench. The follower is connected to the output connecting rod via a connector, and the connector is configured as a right-angle member.

Abstract: A sensor is used to detect the position of a movable part, and comprises a pointer rigidly connected to the movable part and, a circuit structure interacting with the pointer. A component of the circuit structure is arranged on the side of the circuit structure facing away from the pointer.

Abstract: A sealing system for an exhaust gas recirculation valve, the exhaust gas recirculation valve including a housing and a valve stem disposed in the housing, the sealing system being disposed between the housing and the valve stem in order to prevent exhaust gas from entering a valve body interior. The sealing system includes at least two sealing assemblies. An exhaust gas recirculation valve includes the sealing system, and the sealing system effectively prevents exhaust gas from leaking into the valve body interior, and effectively prevents carbon deposits from sticking to the valve stem or entering the valve body interior, so as to increase the lifespan and reliability of the exhaust gas recirculation valve.

Abstract: A cam gear for a linear drive device that transforms a rotational movement of a first component into a linear movement of a second component includes a cam trench, having, in a circumferential direction of the cam gear, a first end portion and a second end portion, the cam trench being arranged on an end face of the cam gear. The cam gear is configured as a sector gear, and at least one of the first and second end portions of the cam trench is open.

Abstract: A linear drive device includes: a motor; a speed-reducing transmission stage having: a pinion gear fixedly connected to an output shaft of the motor, and a transmission gear meshing with the pinion gear; a linear transmission stage configured to transform a rotational movement of the transmission gear into a linear movement of an output connecting rod, the output connecting rod being received in a sleeve member so as to only move linearly; a spiral trench arranged on the transmission gear; and a follower received in the spiral trench so as to be movable in the spiral trench. The follower is connected to the output connecting rod via a connector, and the connector is configured as a right-angle member.