A clamping mechanism is provided. The mechanism includes a male clamping body. The mechanism also includes a female clamping body configured to mate with the male clamping body. The mechanism further includes tightening bolts structured to connect the male clamping body to the female clamping body. The mechanism includes connecting spans connected to the male clamping body and the female clamping body. The mechanism also includes integral positioning ring halves connected to the male clamping body and the female clamping body, wherein the positioning rings are designed to fit into a positioning groove of a drive shaft and to provide a backstop to a support ring. Also, the connecting spans, the male clamping body, and the female clamping body have inner diameters that are identical and are arranged to securely fit onto an outer surface of the drive shaft when the tightening bolts are tightened.

The invention relates to a ring seal which comprises a main body capable of implementing a seal by static contact relative to a first cylindrical element, and a first circumferential lip capable of engaging by friction with a cylindrical surface of a second cylindrical element, said cylindrical elements being substantially coaxial and mounted so as to pivot relative to one another. The main body comprises a front surface configured to be in axial contact with a front surface of the first cylindrical element, the main body comprising a second circumferential lip radially opposite the first circumferential lip and capable of being in radial contact with a cylindrical surface of the first cylindrical element.

A system for rotating an inner propeller shaft within a gearcase via a driveshaft. The system includes a stub shaft that extends between forward and aft ends and is rotatable within the gearcase. A forward gear is rotatably coupled to the stub shaft, where the forward gear meshes with the driveshaft and is engageable to become rotatably fixed to the stub shaft such that rotating the driveshaft rotates the stub shaft. A shock absorbing coupler is positioned within the gearcase, where the coupler has forward and aft ends, where the forward end of the coupler is engageable with the aft end of the stub shaft, and where the aft end of the coupler engageable with the inner propeller shaft. The coupler is torsional between the forward and aft ends such that shock is absorbable between the inner propeller shaft and the driveshaft.

The invention relates to a marine meachanical seal arrangement comprising a first mechanical seal (2) comprising a first rotating slide ring (21) and a second stationary slide ring (22) defining a first sealing gap (23) between their two sliding surfaces (21a, 22a), a second meachanical seal (3) comprising a second rotating slide ring (31) and a second stationary slide ring (32), which define a second sealing gap (33) between their sliding surfaces (31a, 32a), a barrier circuit (10) comprising a barrier fluid cavity (8) which is arranged between the first mechanical seal (2) and the second mechanical seal (3) and is filled with a barrier fluid, the barrier fluid cavity (8) being divided into a first sub-cavity (81) and a second sub-cavity (82), the first subcavity (81) and the second subcavity (82) being separated by a flexible lip seal (7) wherein the second sub-cavity (82) is arranged at the second mechanical seal (3), and wherein the lip seal (7) is arranged such that a flow of barrier fluid from the first subcavity (81) into the second subcavity (82) is allowed and a flow of barrier fluid from the second subcavity to the first subcavity is prevented. (FIG. 2)

A coaxial contra-rotating circumferential thruster includes: an input end, a one-way commutator, a two-way deflector, a steering support and two output ends. The input end is connected to a power device. The one-way commutator converts one rotation into two rotations having the same rotation speed and opposite rotation directions. The two-way deflector respectively indirectly connects two shafts of a contra-rotating sleeve shaft to two output shafts thereof by means of two bevel gear pair. Two unidirectional deflecting torques respectively generated by the two bevel gear pairs have the same magnitude and opposite directions. By transferring by means of a bracket or an output sleeve shaft, the two unidirectional deflecting torques cancel each other. The two output ends are respectively connected to two propellers (or rotors). A turnaround control device controls the steering support to be turned around, the control torque required for co-rotating and contra-rotating is the same.

A vessel includes a vessel body, an engine, a propulsion device, a drive shaft, a partition wall, a bearing, an elastic member, an outer housing, and a positioning member. The drive shaft transmits a driving force of the engine to the propulsion device, and the propulsion device generates a thrust by the driving force. The drive shaft is inserted into an insertion hole of the partition wall. The bearing rotatably supports the drive shaft. The elastic member supports the bearing. The outer housing supports the elastic member, and is fixed to the partition wall. The positioning member positions the elastic member with respect to the bearing and the outer housing by pressing the elastic member.

An electrically driven propulsion system for a watercraft comprises an electric motor, a pulse inverter, a thrust bearing, and a transmission is presented. The pulse inverter can be electrically coupled to the electric motor and adapted to provide an electrical supply power of at least 50 kW to the electric motor. The electrically driven propulsion system further comprises a common waterproof housing. An external section of the transmission can be arranged outside of the common waterproof housing. The transmission can be adapted to rotationally couple the external section of the transmission to the electric motor. The thrust bearing can be mechanically coupled to the rotary shaft of said transmission and to the common waterproof housing. The thrust bearing can be adapted to transfer a force applied to the transmission along an axial direction of said rotary shaft of the transmission to the common waterproof housing.

A wheel-legged amphibious mobile robot with a variable attack angle, which belongs to the technical field of robot structure technology. The robot includes three parts: motion unit, body trunk and power unit. As a key structure, the motion unit mainly includes a moving mechanism, a wheel assembly, a telescopic mechanism and a transmission device. The robot drives the telescopic mechanism to reciprocate linearly through a gear and rack set, and pushes “legs” to expand and retract, so as to realize a mutual switching between a wheeled mode and a gait mode. Under transmission of bevel gear set, the blades can rotate at any same angle at the same time, to change the attack angle and realize the steering. The robot provided by the present disclosure can effectively adapt to a complex and harsh amphibious environment, and meet a series of operation requirements such as rapid movement, obstacle climbing, underwater steering.

A wheel-legged amphibious mobile robot with a variable attack angle, which belongs to the technical field of robot structure technology. The robot includes three parts: motion unit, body trunk and power unit. As a key structure, the motion unit mainly includes a moving mechanism, a wheel assembly, a telescopic mechanism and a transmission device. The robot drives the telescopic mechanism to reciprocate linearly through a gear and rack set, and pushes “legs” to expand and retract, so as to realize a mutual switching between a wheeled mode and a gait mode. Under transmission of bevel gear set, the blades can rotate at any same angle at the same time, to change the attack angle and realize the steering. The robot provided by the present disclosure can effectively adapt to a complex and harsh amphibious environment, and meet a series of operation requirements such as rapid movement, obstacle climbing, underwater steering.

The invention relates to a marine meachanical seal arrangement comprising a first mechanical seal (2) comprising a first rotating slide ring (21) and a second stationary slide ring (22) defining a first sealing gap (23) between their two sliding surfaces (21a, 22a), a second meachanical seal (3) comprising a second rotating slide ring (31) and a second stationary slide ring (32), which define a second sealing gap (33) between their sliding surfaces (31a, 32a), a barrier circuit (10) comprising a barrier fluid cavity (8) which is arranged between the first mechanical seal (2) and the second mechanical seal (3) and is filled with a barrier fluid, the barrier fluid cavity (8) being divided into a first sub-cavity (81) and a second sub-cavity (82), the first subcavity (81) and the second subcavity (82) being separated by a flexible lip seal (7) wherein the second sub-cavity (82) is arranged at the second mechanical seal (3), and wherein the lip seal (7) is arranged such that a flow of barrier fluid from the first subcavity (81) into the second subcavity (82) is allowed and a flow of barrier fluid from the second subcavity to the first subcavity is prevented. (FIG. 2)