A rotary piston and cylinder device having a rotor, a stator and a shutter disc, the rotor including a piston which extends from the rotor into the cylinder space, the rotor and the stator together defining the cylinder space, the shutter disc passing through the cylinder space and forming a partition, and the disc having a slot which allows passage of the piston, the shutter disc having a circumferential surface that forms a seal with the rotor, the circumferential surface defining at least one close running line with the rotor, and the at least one close-running line offset from a rotor plane which lies on a radius of the rotor and which includes the axis of rotation of the rotor.

A rotary piston and cylinder device having a rotor, a stator and a shutter disc, the rotor including a piston which extends from the rotor into the cylinder space, the rotor and the stator together defining the cylinder space, the shutter disc passing through the cylinder space and forming a partition, and the disc having a slot which allows passage of the piston, the shutter disc having a circumferential surface that forms a seal with the rotor, the circumferential surface defining at least one close running line with the rotor, and the at least one close-running line offset from a rotor plane which lies on a radius of the rotor and which includes the axis of rotation of the rotor.

A gearmotor assembly includes a housing, a rotatable shaft, a bearing, a retaining member, and a seal. The housing defines a gear chamber configured to contain a lubricant. The bearing rotatably supports the shaft. The bearing is disposed between the housing and the shaft. The retaining member at least in part restricts axial shifting of the bearing. The retaining member presents a plurality of retaining member threads. The housing defines a plurality of housing threads threadably engaging the retaining member threads. The retaining member and the housing cooperatively at least in part define an interface. The interface includes a threaded portion and an additional portion. The threaded portion is cooperatively defined by the retaining member threads and the housing threads. The additional portion is fluidly interconnected to the threaded portion. The seal is disposed along the interface to prevent lubricant escaping the gear chamber past the interface.

A movement device (1) comprising a stator chamber (2) inside which a rotor (3) can rotate about a respective axis (100), wherein the stator chamber (2) has an elongated shape that is extended along a longitudinal direction (101) and is connected, by means of a first intake or supply duct (4) and a second transfer or discharge duct (5), to a tank (6) for containing pressurized oxyhydrogen, the containment tank (6) having a first tank portion (6a) connected to the intake or supply duct (4) and a second tank portion (6b) connected to the transfer or discharge duct (5), a compensation valve (8) being interposed between the first tank portion (6a) and the second tank portion (6b), the rotor (3) comprising a three-lobed structure which forms three side walls (31, 32, 33) which cooperate with the stator chamber (2) in order to form, during its rotation about the axis (100), an intake chamber (41) at the outlet (4a) of the first intake or supply duct (4), a discharge chamber (42) at the outlet (5a) of the second transfer or discharge duct (5), and a compression chamber (43), the rotor having a blade-like portion (60) which forms a counterweight.

A movement device (1) comprising a stator chamber (2) inside which a rotor (3) can rotate about a respective axis (100), wherein the stator chamber (2) has an elongated shape that is extended along a longitudinal direction (101) and is connected, by means of a first intake or supply duct (4) and a second transfer or discharge duct (5), to a tank (6) for containing pressurized oxyhydrogen, the containment tank (6) having a first tank portion (6a) connected to the intake or supply duct (4) and a second tank portion (6b) connected to the transfer or discharge duct (5), a compensation valve (8) being interposed between the first tank portion (6a) and the second tank portion (6b), the rotor (3) comprising a three-lobed structure which forms three side walls (31, 32, 33) which cooperate with the stator chamber (2) in order to form, during its rotation about the axis (100), an intake chamber (41) at the outlet (4a) of the first intake or supply duct (4), a discharge chamber (42) at the outlet (5a) of the second transfer or discharge duct (5), and a compression chamber (43), the rotor having a blade-like portion (60) which forms a counterweight.

A rotary piston and cylinder device (1) comprising a rotor (2), a stator (4), a rotatable shutter (3), the rotor and the stator comprising surface portions which define a chamber, wherein the rotor comprises a first surface portion (2A) and the stator comprises substantially two surface portions (4a; 4b), and the two surface portions of the stator neighbour each other.

A rotary piston and cylinder device (1) comprising a rotor (2), a stator (4), a rotatable shutter (3), the rotor and the stator comprising surface portions which define a chamber, wherein the rotor comprises a first surface portion (2A) and the stator comprises substantially two surface portions (4a; 4b), and the two surface portions of the stator neighbour each other.

In one aspect, described is a rotor for a Wankel engine comprising two circumferentially spaced apart apex seals at each of the apex portions with each apex seal protruding axially from both end faces, and each apex seal having a first biasing member biasing the apex seal radially outwardly away from the peripheral face of the body, and a second biasing member biasing the apex seal axially outwardly away from a respective one of the end faces, the two apex seals of a same one of the apex portions being biased by the respective second biasing member in opposite axial directions from one another.

In one aspect, described is a rotor for a Wankel engine comprising two circumferentially spaced apart apex seals at each of the apex portions with each apex seal protruding axially from both end faces, and each apex seal having a first biasing member biasing the apex seal radially outwardly away from the peripheral face of the body, and a second biasing member biasing the apex seal axially outwardly away from a respective one of the end faces, the two apex seals of a same one of the apex portions being biased by the respective second biasing member in opposite axial directions from one another.

A rotary piston and cylinder device (1) comprising a rotor (2), a stator (4) and a rotatable shutter (3), the rotor comprising a piston (5) which extends from the rotor into a working chamber, the rotor and the stator together defining a working chamber, the shutter arranged to extend through the working chamber and forming a partition therein, and the shutter comprising a slot which allows passage of the piston therethrough, a bearing (20) which mounts the rotor relative to the stator, the rotor comprising a formation (12; 30) which extends substantially axially away from the chamber, and the formation being radially outward of the bearing and extending around the axis of rotation, and the formation comprising a surface which at least in part defines a space between the rotor and the stator, and at least part of that space and/or the formation overlaps in an axial direction with the bearing.