Some embodiments of a gearbox for an irrigation system can comprise a housing, a worm gear within the housing, a bull gear within the housing and configured to be engaged with the worm gear, a diaphragm, and a vent. The diaphragm can define a chamber configured for expansion and contraction and configured to be positioned inside the housing to relieve pressure build-up within the housing. The vent can be configured to allow air to flow between the atmosphere and the chamber.

Slew drive systems for rotational and axial load bearing, e.g., in applications including satellite-based telecommunications systems, are disclosed herein. In some cases, slew drive systems disclosed herein can improve efficiency, accuracy, and/or reliability of telecommunication systems while reducing the cost and complexity of manufacture. For example, a slew drive system can comprise a threaded plug and a retaining ring in addition to a worm gear, a plurality of tapered roller bearings, and a worm wheel, allowing a significant reduction in material and labor costs of slew drive manufacture, which can be critical in the manufacture of expensive telecommunications system actuator assemblies.

A gear is provided that has excellent continuous moldability for practical use, and both high slidability and high durability. The provided gear is a molded resin constructed of a resin composition comprising a thermoplastic resin (A) and cellulose nanofibers (B) with an average fiber diameter of 1000 nm or smaller, and having a number average molecular weight of the thermoplastic resin (A) in the range of 10,000 to 150,000, wherein a sliding surface of the gear with another gear teeth has an arithmetic mean surface roughness Sa of 3.0 μm or lower.

The invention provides a grease composition for lubricating resins which contains a base oil, a diurea compound represented by formula (I) as a thickener: R.sup.1NHCONHR.sup.2NHCONHR.sup.3 (I) (wherein R.sup.2 represents a bivalent aromatic hydrocarbon group having 6 to 15 carbon atoms, and R.sup.1 and R.sup.3 each independently represent a straight-chain or branched alkyl group having 8 to 22 carbon atoms), and a chained hydrocarbon polymer having a weight-average molecular weight of 20,000 to 300,000.

A geared motor (1) for a motor-vehicle wiping system including an electric motor (2) is disclosed. The geared motor has a rotor (20) including magnetic elements, a stator (21) having the electromagnetic excitation windings, a rotary shaft (22) rigidly connected to the rotor, a reduction gear (3) linking the rotary shaft (22) and an output shaft of the geared motor, and a casing (4) forming a protective envelope for said reduction gear or the electric motor (2). The reduction gear (3) includes a worm screw and worm wheel gear, the worm screw (30) being rigidly connected to the rotary shaft of the rotor (22), the worm wheel (31) rigidly connected to an output shaft (8) of the geared motor, bearing means (23, 24) for guiding the rotary shaft of the rotor (22) in rotation in relation to the casing (4), and a determination device for determining the angular position of the rotor including a multi-pole magnet (5) that is rigidly connected to the rotary shaft (22) of the rotor (20).

A motor device is provided. The motor device includes a motor, a lead screw, a transmission mechanism and a housing. The transmission mechanism is configured to transmit rotation of the motor to the lead screw. The housing includes a housing outer wall to define a housing cavity and a partition to define a transmission cavity for accommodating the transmission mechanism. The transmission cavity is inside the housing cavity. The housing cavity also accommodates at least a portion of the lead screw. The partition includes a first protruding sidewall and a second protruding sidewall respectively on either side of the transmission cavity, and the transmission cavity is sealed for a lubricant that is used for the transmission mechanism and contained in the transmission cavity.

A motor driven power steering device including a motor and a speed reducer configured to decelerate a rotation speed of the motor, wherein the speed reducer includes a worm gear coupled to a drive shaft of the motor and rotatably installed to a speed reducer housing through a bearing, a worm wheel gear-coupled with the worm gear, and a rotation member mounted between the worm gear and the bearing and configured to circulate a lubrication agent applied between the worm gear and the worm wheel.

The present invention provides a lubrication device for coating a lubricant onto the outer circumferential surface of a bearing. A lubrication device comprises a housing and a lubrication member that is accommodated within the housing. A bearing crosses and passes through the lubrication member so that an outer circumferential surface of the bearing comes into contact with an inner surface of the lubrication member, and due to this configuration, it becomes possible for the lubricant to be coated onto the outer circumferential surface of the bearing.

A mechanism including at least one wheel which is mounted rotatably movable about a rotation axis, in a casing containing a lubricant, such as grease, the wheel being defined radially by a peripheral rim and axially by at least one first wheel flank, whereas the casing forms a covering crown which overlaps the first wheel flank, the wheel including at least one vane which projects axially on the first wheel flank, towards the covering crown, whereas the casing includes at least one deflector which projects axially on the covering crown, towards the first wheel flank, the vane and the deflector being arranged so that when a first leading edge of the vane approaches and then overflies a retaining edge of the deflector in the first direction of rotation, the imaginary intersection point thereof is shifted radially towards the rim so that the lubricant is sent back towards the rim.

An urging member urges a first end of a worm shaft toward a worm wheel via a first bearing. The worm shaft includes a tooth flank forming portion and a non-tooth flank forming portion formed between the first end and the tooth flank forming portion. In a housing, a shaft housing portion that houses the worm shaft includes a substantially straight portion and a reduced diameter portion. The substantially straight portion has a substantially constant bore diameter, and extends in an axial direction of the worm shaft. The reduced diameter portion is arranged on the first end side with respect to the substantially straight portion, and has a bore diameter reduced from a position that overlaps tooth flanks in the axial direction to a position that overlaps the non-tooth flank forming portion in the axial direction.