Abstract: A parallel or redundant hybrid drive of a marine drivetrain of a propulsion unit includes an input shaft, which is configured to be driven by a primary drive source; a clutch unit attached to the input shaft with which rotation of the input shaft can be either connected, reversed, or disconnected; a countershaft transverse to the input shaft and driven by the input shaft via a gear; and a secondary drive source arranged via an interconnected clutch at an end of the countershaft, so that upon driving of the input shaft by the primary drive source, the secondary drive source drives the countershaft either on its own or in cooperation with the primary drive source.

Abstract: A parallel or redundant hybrid drive of a marine drivetrain of a propulsion unit includes an input shaft, which is configured to be driven by a primary drive source; a clutch unit attached to the input shaft with which rotation of the input shaft can be either connected, reversed, or disconnected; a countershaft transverse to the input shaft and driven by the input shaft via a gear; and a secondary drive source arranged via an interconnected clutch at an end of the countershaft, so that upon driving of the input shaft by the primary drive source, the secondary drive source drives the countershaft either on its own or in cooperation with the primary drive source.

Abstract: A propeller drive for boats features a transition cone between the gearbox housing and the propeller hub(s). The propeller hub (that is closest to the gearbox housing) is smaller in cross-sectional dimension than the gearbox housing. The dimension of the front end of the transition cone corresponds to the cross-sectional dimension of the gearbox housing, and the dimension of the rear end of the transition cone corresponds to the cross-section dimension of the (closest) propeller hub. The transition cone has a bulging shoulder between the front and rear ends, the largest peripheral cross-sectional dimension of which is greater than the cross-sectional dimension of the front of the transition cone.

Abstract: Propeller combination for an aft-mounted boat propeller drive unit with counter-rotating pushing propellers (8,9). The forward propeller (9) is made with blades (12) which have blade tips with an outer edge (b) which approaches a straight line. The width of the blade tip is between 40% and 45% of the maximum width of the blade.

Abstract: Propeller combination for an aft-mounted boat propeller drive unit with counter-rotating pushing propellers (8,9). The forward propeller (9) is made with blades (12) which have blade tips with an outer edge (b) which approaches a straight line. The width of the blade tip is between 40% and 45% of the maximum width of the blade.

Abstract: A marine propeller drive (1) for boats, including a gearbox (10) for a motor transmission and an associated impelling propeller (12). The propeller (12) is provided with a propeller hub (14), the main peripheral cross-section dimension (A) of which is less than the main peripheral cross-section dimension (B) of the gearbox (10) and where a transition cone (18) is located between the gearbox (10) and the propeller hub (14). The transition cone (18) has a front end (20) located in connection with the gearbox (10), where the front end (20) has an initial peripheral cross-section dimension (C) essentially corresponding to the main peripheral cross-section dimension (B) of the gearbox (10). A rear end (22) of the cone is located in connection with the propeller hub (14), where the rear end (22) has a connecting peripheral cross-section dimension (D) essentially corresponding to the main peripheral cross-section dimension (A) of the propeller hub (14).

Abstract: A propeller spinner (5) for a marine propeller (1) having multiple propeller blades (2) attached to a propeller hub (3) that is adapted for attachment to a propeller shaft (4) and includes a sacrificial anodic material for protecting the propeller shaft (4) and/or propeller hub (3) from corrosion. There is included a hollow spinner cone (6) made of a non-anodic material and the spinner cone (6) has at least one perforation in its outer peripheral surface. An anodic insert body (9) that is made of the sacrificial anodic material constitutes an insert body (9) that is substantially contained within the hollow spinner cone (6). The insert body (9) has at least one radical protrusion (10) extending at least partially through said perforation (7) in the spinner cone (6).

Abstract: System and method for providing a hydraulic system (1) arranged between a first marine propulsion device (2, 42) and a second marine propulsion device (3, 43). Each propulsion device is arranged to rotate about a respective axis (6, 7, 46, 47) at a distance from one another. The system (1) includes a first hydraulic piston-cylinder device (8, 50) and a second hydraulic piston-cylinder device (13, 55) arranged between the second propulsion device (2, 3, 42, 43) and an element (12, 17, 54, 59) fixed in relation to the axis (6, 7, 46, 47). Connecting the piston-cylinder devices (8, 13, 50, 55) to one another via a first hydraulic circuit (18, 60) and a second hydraulic circuit (19, 61) leads to rotation of one propulsion device (2, 3, 42, 43) resulting in rotation of the other propulsion device (2, 3, 42, 43). The method and arrangement afford a tie bar function.

Abstract: A propeller spinner (5) for a marine propeller (1) having multiple propeller blades (2) attached to a propeller hub (3) that is adapted for attachment to a propeller shaft (4) and includes a sacrificial anodic material for protecting the propeller shaft (4) and/or propeller hub (3) from corrosion. The invention includes a hollow spinner cone (6) made of a non-anodic material and the spinner cone (6) has at least one perforation in its outer peripheral surface. An anodic insert body (9) that is made of the sacrificial anodic material constitutes an insert body (9) that is substantially contained within the hollow spinner cone (6). The insert body (9) has at least one radical protrusion (10) extending at least partially through said perforation (7) in the spinner cone (6).

Abstract: Boat propeller drive with an underwater housing which is connected in a fixed manner to a boat hull and has tractor propellers arranged on that side of the housing facing ahead. In the rear edge of the underwater housing, a rudder blade is mounted for pivoting about a vertical rudder axis.

Abstract: Boat propeller drive with an underwater housing which is connected in a fixed manner to a boat hull and has tractor propellers arranged on that side of the housing facing ahead. Arranged in that end portion of the underwater housing facing astern is an exhaust discharge outlet for discharging exhaust gases from an internal combustion engine connected to the propeller drive.

Abstract: A boat propeller drive with an underwater housing which is connected in a fixed manner to a boat hull and has tractor propellers which are arranged on that side of the housing facing ahead and the blade areas of which are adapted to one another in such a manner that, at least under certain operating conditions, the aft propeller works in a cavity-generating manner whereas the fore propeller works in a cavitation-free manner.

Abstract: An hydraulic installation in a boat hull for swinging a properller rig pivotably suspended in a shell on a boat transom using a piston-cylinder device arranged in a hydraulic control circuit. A control valve included in the hydraulic circuit for controlling the flow to and from the hydraulic cylinder is sealingly mounted in a through-opening in the shell, so that one side of the valve faces outwardly towards the propeller rig in order to be subjected to water spray during driving and serve as an oil cooler.

Abstract: Servo-assisted steering arrangement for an element pivotable about a steering axis, for example a propeller drive means suspended on a boat transom, said drive means driving a pair of hydraulic steering cylinders (20a, 20b) which connect the drive means to the transom. A manually driven low pressure pump (39), for example a steering wheel pump, communicates both with a cylinder chamber (70, 71) in each steering cylinder (20a, 20b) and with a control valve (36). A motordriven high pressure pump (41) communicates via the control valve with the other cylinder chamber (72, 73) in each steering cylinder. The control valve is disposed so that, when the low pressure pump is driven, it opens a communication both between the pressure side (40) of the high pressure pump and a cylinder chamber (72) in the one cylinder (20b) and between the return side (42) and the corresponding cylinder chamber (73) in the other cylinder.

Abstract: Drive assembly in a boat includes a propeller shaft housing (5) which projects downwards on the underside of the bottom (4) of the boat and is connected to a drive unit (1), arranged on the inside of the boat, via members (9) which, in the event of a load acting on the housing, for example in the event of grounding, bring about controlled separation of the housing from the drive unit and the bottom of the boat.

Abstract: Transmission for boats, comprising an input shaft (2), a reversing mechanism and an output shaft (3). The reversing mechanism is comprised by a right angled bevel gearing with two bevel gears (7, 8), which are freely rotatably mounted on an intermediate shaft (4) and engaged with a bevel gear (6) on the input shaft. The bevel gears (7, 8) each cooperate with an individual clutch (13, 14) respectively, by which one of the bevel gears can be locked to the intermediate shaft. The clutches (13, 14) are placed outside the bevel gearing, i.e. on the sides of the bevel gears (7, 8) facing away from each other in order to place the bevel gears (7, 8) close to each other. The clutches are wet clutches compressible by a piston (19) that moves in a cylinder (20) which in turn communicates with a hydraulic pump (22) driven by one of the input and intermediate shafts (2, 4). The output shaft (3) is driven by a bevel gear (12) having a recess in which one (14) of the clutches is partially received.