Abstract: A double clutch apparatus for a hybrid electric vehicle for transmitting torques of an engine and a motor to first and second input shafts includes two clutches formed in a volume between the rotor and the two coaxial input shafts, two slave cylinders operating the two clutches, an engine clutch shaft coaxially disposed between the two input shafts and an engine output shaft and connected to the rotor, an engine clutch disposed between the engine output shaft and the engine clutch shaft, and a third slave cylinder operating the engine clutch.

Abstract: A clutch mechanism includes a control member. The control member is adapted to receive motive power and includes a first dry clutch member and a first viscous clutch member. The clutch mechanism further includes an output member that includes a second dry clutch member and a second viscous clutch member. The first and second dry clutch members form a dry clutch and the first and second viscous clutch members form a viscous clutch. The clutch mechanism further includes an actuation arm coupled to at least one of the control and output members. The actuation arm is selectively controllable to effect relative movement of the control and output members such that one of the dry and viscous clutches is selectively engaged.

Abstract: The present disclosure describes a wrap spring torque nipple that includes a first helical spring, a second helical spring, and a middle portion connected to and between the first helical spring and the second helical spring. The first helical spring and the second helical spring have different rotational helix orientations, and the first helical spring is configured to receive an input shaft and the second helical spring is configured to receive an output shaft, wherein the wrap spring transfers rotational power up to a defined torsional value from the input shaft to the output shaft.

Abstract: Operating a clutch assembly of a vehicle drive train, the clutch assembly comprising a clutch with a clutch component that exchanges heat at least indirectly with a medium which is conducted at least partially in the clutch, comprises at least: a) determining an operating point parameter which is representative of a current operating state of the clutch; b) determining a first thermal property parameter of the medium, as a function of the determined operating point parameter; c) determining a second thermal property parameter of the at least one clutch component; d) calculating a component temperature of the at least one clutch component as a function of at least the following three values: a further component temperature of a further clutch component, the first thermal property parameter, and the second thermal property parameter; and e) adapting activation of the clutch as a function of the calculated component temperature.

Abstract: A method and a system for controlling a backlash of a powertrain included in a vehicle in connection with a gear shifting operation is presented. The method comprises: controlling, in connection with a first gear shifting operation, a clutch included in the powertrain to a slipping position, in which slipping position the clutch transfers a slipping torque that is less than a torque being transferred in a closed position for the clutch; analyzing a change of a rotational speed for an input shaft of a gearbox included in the powertrain; determining a position for the clutch, for which position the change of the rotational speed has a value corresponding to a backlash torque, the backlash torque having a predetermined value for eliminating the backlash; and utilizing the determined clutch position for controlling the clutch in connection with a second subsequent gear shifting operation.

Abstract: A disk brake includes a brake disc, a brake shaft having a rotation axis that lies parallel to a main plane of the brake disc, a brake pad lying on a same side as the brake shaft relative to the brake disc, a pressure piece disposed between the brake shaft and the brake pad, a first limiting device configured to limit, to a predefined first extent, the displaceability of the pressure piece relative to the brake disc in a direction parallel to the rotation axis of the brake shaft, and a second limiting device configured to limit, to a predefined second extent, the displaceability of the brake shaft relative to the brake disc in a direction parallel to the rotation axis of the brake shaft, the second limiting device comprising a first stop on the pressure piece and a second stop on the brake shaft.

Abstract: A locking mechanism capable of locking and unlocking the rotation of the rotor shaft of an electric motor is constituted by a plurality of recesses formed in one side surface of one gear of a plurality of gears of a reduction gear mechanism. A locking pin is movable toward and away from the recesses, and is configured such that when the locking pin moves toward the recesses, the locking pin engages in one of the recesses and locks the one gear. A linear solenoid is configured to move the locking pin toward and away from the recesses, and a protrusion extends from one end surface of each recess.

Abstract: The present invention refers to a disc brake having a brake caliper, which overlaps at least one brake disc, and a brake actuation mechanism having an amplification mechanism including a brake lever being rotatable around a pivot bearing for introducing a clamping force from an actuator, the brake lever having an arm extending between its actuator connection means and its transmission means, a thrust element in connection with said transmission means for transmitting the amplified clamping force onto the brake disc, in which the brake lever comprises a recess between its actuator connection means and its transmission means, which recess is traversed by the axis of said pivot bearing.

Abstract: A dynamic damper includes a tubular member, a mass body, a protruding section, an elastic coupling section, a fastening member, and a projecting section. The protruding section is positioned toward the second end of the tubular member with respect to the projecting section. The projecting section and the protruding section overlap in the axial direction of the tubular member at any position reached by relatively rotating the mass body around the axial center of the tubular member with respect to the tubular member.

Abstract: The present invention discloses an ultra-low frequency (ULF) tuned liquid mass damper, and relates to the technical field of bridge vibration control. The tuned damper includes a damping box which is provided with a spring set secured at one end to the damping box, the other end connected with a mass block. The damping box is filled with damping liquid, and the mass block is completely immersed or partially immersed in the damping liquid. The damping ratio of the ULF tuned liquid mass damper ranges from 3% to 35%, and the inherent frequency 0.05 to 0.5 Hz. The ULF tuned liquid mass damper, according to the present invention, can fully utilize the additional mass of the damping liquid, and with the buoyancy effect of the liquid, maintain the frequency of structural vibration below 0.

Abstract: A fluid-filled tubular vibration-damping device including: an inner shaft member and an outer tube member connected by a main rubber elastic body defining a non-compressible fluid filling region partitioned into two axially-opposite fluid chambers connected by an orifice passage, by a partition wall rubber fixed to a side of the inner shaft member in an inner periphery thereof and inserted in a side of the outer tube member at an outer periphery thereof so that the partition wall rubber is axially movable relative to the side of the outer tube member; a seal tubular part formed integrally at the outer periphery of the partition wall rubber to axially protrude to opposite sides; and a thicker annular fitting part formed integrally at each protruding tip of the seal tubular part, and fitted in the side of the outer tube member, slidably along it.

Abstract: A damping force control type shock absorber capable of achieving both air bleeding performance and damping force responsiveness at reduced cost. When a pilot valve (47) is closed during the extension stroke of a piston rod (6), a cylinder upper chamber (2A) is communicated with a back-pressure chamber (46) through a passage (73) including an orifice (76), a communicating passage (70), a pilot chamber (33), and a communicating passage (50). At this time, the cylinder upper chamber (2A) is not communicated with a cylinder lower chamber (2B); therefore, damping force responsiveness is ensured. Further, because there is no need to provide a check valve in the passage, it is possible to suppress an increase in manufacturing cost. Further, air entering the pilot chamber (33) moves upward through the communicating passage (70). Therefore, the air can be discharged into the cylinder upper chamber (2A) through the passage (73).

Abstract: An object of the present invention is to provide a vibration damping device including a bearing member capable of achieving simplification of configuration in the vibration damping device, reducing frictional force during operation, and having an excellent wear resistance. A vibration damping device of the present invention includes a bearing structure, in which a metal bush (bearing member) has a resin layer on a side defined as a friction sliding surface of a base member, the resin layer includes polytetrafluoroethylene and a tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer resin, and the metal bush is lubricated by a magneto-rheological fluid composition.

Abstract: A controllable shock absorber may include a cylinder tube with hydraulic fluid, a movable piston that divides the cylinder tube into two working spaces, and a piston rod connected to the piston. Two fluid leadthroughs in the piston may connect the two working spaces. Valve assemblies for damping piston movement in actuating directions may be arranged on the leadthroughs. Each valve assembly may have a pilot control chamber and a valve plate movable between open and closed positions. The valve plate can be prestressed into the closed position by pressure loading the pilot control chamber. Pressures in the pilot control chambers can be set by a pilot control valve having a valve body that is movable between open and closed positions. An outflow cross section between the pilot control chambers and the working spaces is settable.

Abstract: An isolator for a stationary vibration isolation system, which is effective in the horizontal and vertical directions, the isolator comprising at least one pneumatic actuator.

Abstract: A bearing element (1) for mounting a component, especially a cooling module, with an elastomeric element (12), the elastomeric element (12) having an inner connection (6) for connecting to a bearing pin (7) of the component to be mounted, an outer connection (8) for connecting to a bearing frame (10), and at least one support arm (14), which extends between the inner connection (6) and outer connection (8) and elastically connects these together, with a force transfer surface (16) of the outer connection (8) to the bearing frame (10) formed by an outer end face of the support arm (10), and the bearing element (1) formed such that, in the event of an elastic displacement of the inner connection (6) relative to the outer connection (8) in a predetermined, radial displacement direction relative to the bearing element (1) the support arm (14) is stressed predominantly by thrust.

Abstract: A sealing structure includes a hub, an outer-periphery-side mass body, an outer-periphery-side damper elastic body, an inner-periphery-side mass body, and an inner-periphery-side damper elastic body. The hub is attached to one end of a rotary shaft of an object to be attached. The oil seal includes a seal lip in an annular shape and a side lip in an annular shape and is oriented to the inner-periphery-side mass body, is attached in a through hole in the object to be attached, and hermetically seals a void between the hub and the object to be attached. The inner-periphery-side mass body forms at least a part of a pocket which is composed of a recessed portion in an annular shape, and the side lip forms a labyrinth seal which is composed of a gap in an annular shape between the side lip and the pocket.

Abstract: A securing and centring device for securing fastening elements of a vibration damping device and for centring said vibration damping device on a component, such as a crankshaft. The securing and centring device may includes a securing mechanism that can be inserted into an opening of the vibration damping device and is configured to secure a fastening element inserted into the opening against falling out, a centering mechanism insertable into a further opening of the vibration damping device and into an assembly opening of said component for positioning and/or centering the vibration damping device and said component relative to each other, and a connecting member connecting the securing mechanism and the centering mechanism. A vibration damping device may include such a securing and centering device.

Abstract: A tubular containment part used in a flywheel containment assembly, wherein the tubular containment part is built up of easily configurable layers of different materials and wherein the containment casing is included a spirally wound tubular structure formed from layers made of one or more different materials. The invention further relates to a method for manufacturing such a tubular containment part.

Abstract: A metal ring of a transmission belt in a belt-type continuously variable transmission. A first nitrided layer formed in a main surface of the metal ring, and a second nitrided layer formed in an end surface of the metal ring are included. A thickness of the second nitrided layer is smaller than a thickness of the first nitrided layer, and surface hardness of the end surface is higher than surface hardness of the main surface. Even though the second nitrided layer in the end part is thin, the surface hardness of the end surface is high. Therefore, it is possible to restrain fatigue fracture starting from an end part, and it is also possible to restrain deterioration of abrasion resistance of the end surface.

Abstract: A worm gear has a worm wheel, a drive shaft, and a flexible shaft. The worm wheel meshes with a worm shaft, which is driven by the drive shaft. The flexible shaft can be arranged in the drive shaft with a radial gap between at least a portion of the flexible shaft and the drive shaft. The flexible shaft can be coupled to the drive shaft such that a first spring constant is provided for displacement of the flexible shaft in a radial direction within a first range and a second spring constant is provided for displacement of the flexible shaft in the radial direction within a second range.

Abstract: A transmission apparatus is disclosed. The transmission apparatus includes at least a first gearset and a last gearset. Each gearset includes a sun gear, a set of planetary gears, and a ring gear. The ring gears have splined outer surfaces. Each gearset has a rotational speed and a torque. A drum encloses and mates with the gearsets. The drum has splined inner surfaces that mate with the splined outer surfaces. The last splined outer surface transfers the last torque of the last gearset directly to the drum. The drum transfers at least a portion of the last torque to the first splined outer surface of the first gearset. This reduces the first rotational speed of the first gearset and increases the first torque of the first gearset, thereby reducing the last rotational speed of the last gearset and increasing the last torque of the last gearset.

Abstract: A transmission (G) for a motor vehicle includes an input shaft (GW1), an output shaft (GW2), three planetary gear sets (P1, P2, P3), as well as four shift elements (B1, K1, K2, K3). By selective engagement of the four shift elements (B1, K1, K2, K3) in pairs, six forward gears (1-6) are shiftable between the input shaft (GW1) and the output shaft (GW2).

Abstract: A planetary gear train of an automatic transmission for a vehicle may include an input shaft configured to receive power, an output shaft configured to output power; a first planetary gear set including first, second, and third rotation elements; a second planetary gear set including fourth, fifth, and sixth rotation elements; a third planetary gear set including seventh, eighth, and ninth rotation elements; a fourth planetary gear set including tenth, eleventh, and twelfth rotation elements; a fifth planetary gear set including thirteenth, fourteenth, and fifteenth rotation elements; and first to ninth shafts connecting the rotation elements of the first to fifth planetary gear sets.

Abstract: A multi-speed transmission including a plurality of planetary gearsets and a plurality of selective couplers to achieve at least nine forward speed ratios is disclosed. The plurality of planetary gearsets may include a first planetary gearset, a second planetary gearset, a third planetary gearset, and a fourth planetary gearset. The plurality of selective couplers may include a number of clutches and a number of brakes. The multi-speed transmission may have four planetary gearsets and six selective couplers. The six selective couplers may include three clutches and three brakes.

Abstract: The present disclosure provides a multiple speed transmission having an input member, an output member, a plurality of planetary gearsets, a plurality of interconnecting members and a plurality of torque-transmitting mechanisms. The plurality of planetary gear sets includes first, second and third members. The input member is continuously interconnected with at least one member of one of the plurality of planetary gear sets, and the output member is continuously interconnected with another member of one of the plurality of planetary gear sets. At least eight forward speeds and one reverse speed are achieved by the selective engagement of the plurality of torque-transmitting mechanisms.

Abstract: An object of the present invention is to provide a simple-structured tensioner capable of consistently exhibiting the check valve function irrespective of the form of oil supply passages. The tensioner includes a plunger, a housing, a biasing unit, an oil supply passage, and a check valve. The check valve includes a plurality of valve members and a ball seat member. The ball seat member includes a plurality of oil passages and a plurality of seat parts. The check valve further includes a passage forming member having an oil inlet disposed between the plurality of oil passages and the oil supply passage.

Abstract: Inventive embodiments are directed to components, subassemblies, systems, and/or methods for continuously and infinitely variable transmissions (IVT). In one embodiment, a variator is adapted to receive a control system that cooperates with a shift nut to actuate a ratio change in an IVT. In another embodiment, a neutral lock-out mechanism is adapted to cooperate with the variator to, among other things, disengage an output shaft from a variator. Various inventive mechanical couplings, such as an output engagement mechanism, are provided to facilitate a change in the ratio of an IVT for maintaining a powered zero operating condition. In one embodiment, the output engagement mechanism selectively couples an output member of the variator to a ratio adjuster of the variator. Embodiments of a ratio adjuster cooperate with other components of the IVT to support operation and/or functionality of the IVT. Among other things, user control interfaces for an IVT are disclosed.

Abstract: A finger of a robotic hand includes a phalanx portion including at least two phalanxes rotatably coupled to each other, a driving device including a rotating member, a connection assembly including a housing defining a sliding groove that includes a first end and a second end defining a through hole that is in communication with the sliding groove, a cap connected to the housing at the first end, a sliding rod comprising a base slidably received in the sliding groove and a rod protruding from the base, and an elastic member received in the sliding groove and having opposite ends that respectively abut against the base and an inner surface of the second end, and a rope including two opposite ends respectively connected to the cap and one of the at least two phalanxes.

Abstract: The present invention relates to the field of linear actuators, and in particular, to a modular electric linear actuator facilitating assembly and disassembly. The modular electric linear actuator of the present invention mainly includes components such as a motor group, a screw group, an inner tube group, an outer tube group, and pins. The components are fixed through clamping or the pins, so that installation using screw bolts is avoided. By adopting the modular assembly manner, the disassembly is convenient, and the assembly is fast, so that less labor is required, and the production cost is reduced. Moreover, the pins are used for fixing in the end, so that the stability of the entire structure is ensured.

Abstract: A torque converter includes a housing, and a fluid-operated power transmitting portion and a vibration damping device which are accommodated within the housing and which are disposed around an axis such that the vibration damping device is located adjacent to the fluid-operated power transmitting portion in a direction of the axis, the torque converter further includes a space occupying member which occupies a part of a space formed within the housing and between the fluid-operated power transmitting portion and the vibration damping device. The space occupying member comprises a wall surface facing the fluid-operated power transmitting portion in the direction of the axis. A distance in the direction of the axis between a part of the wall surface and the fluid-operated power transmitting portion is smaller than a distance in the direction of the axis between the part of the wall surface and the vibration damping device.

Abstract: A torque converter includes a front cover, an impeller, a turbine, a piston, an internal hydraulic chamber, an external hydraulic chamber and a seal mechanism. The impeller is fixed to the front cover. The turbine is disposed in opposition to the impeller. The piston is disposed between the front cover and the turbine so as to be movable in an axial direction. The piston is engaged by friction with the turbine. The internal hydraulic chamber is delimited by the turbine and the piston. The external hydraulic chamber is obtained by excluding the internal hydraulic chamber from a hydraulic chamber delimited by the front cover and the impeller. The seal mechanism is disposed between the turbine and the piston, the seal mechanism blocking hydraulic oil from flowing into the internal hydraulic chamber from the external hydraulic chamber.

Abstract: A transmission arrangement for a travel drive includes a transmission input that is configured to be coupled to a working machine and a transmission output that is configured to be coupled to an output drive. The transmission arrangement further includes a hydrostatic transmission and a manual transmission coupled in series for the transmission of power between the transmission input and the transmission output. The manual transmission has changeable transmission stages at least when the transmission output is at a standstill. A control device is configured to change the transmission stages.

Abstract: A wave generator of a flat-type strain wave gearing has an insertion member disposed between two wave bearings. The insertion member is pressed into an elliptical outer peripheral surface of a plug and is fixed thereto by an adhesive. An inner ring contact part of the insertion member is in contact with inner rings of the wave bearings from the direction of a center axis. When the flat-type strain wave gearing is in an operating state, the wave bearings can be prevented from moving relative to the plug in the direction of the center axis by means of thrust force acting on the wave bearings.

Abstract: Gears are known to have a whine that can be unpleasant to operators or occupants of vehicles. A gear set is disclosed in which the pressure angle of the teeth varies along the periphery of the gear. A mating gear also has teeth with varying pressure angle. The teeth that mate have an identical pressure angle so that present disclosure is applicable only to 1:1 or integer ratio gears: 2:1, 3:1, etc. Because the teeth meet differently as a function of the pressure angle, the fundamental vibration frequency is not reinforced as would be the case with all teeth having the same pressure angle.

Abstract: In a sealing array for a transmission, in particular for the output shaft of a transmission, and a transmission having a sealing array, a spacer ring is situated between a first and a second shaft-sealing ring, a flange part is connected to the coupling flange, in particular by screws, and a coupling flange presses the second shaft-sealing ring against the spacer ring, the spacer ring presses on the first shaft-sealing ring so that the first shaft-sealing ring is positioned against a flange part. The flange part, the coupling flange, the first shaft-sealing ring, the spacer ring, and the second shaft-sealing ring are arranged as a pre-assembled unit, and thus, in particular, as a transportable, integrated unit.

Abstract: A processing system can include one or more processors configured to: automatically transition an operating condition of a gearbox cooling system through a plurality of operating states; determine an efficiency of the gearbox at each of a plurality of the operating states; for each of the plurality of operating states: select a future operating state of the cooling system based on the determined gearbox efficiency at the current operating state.

Abstract: A gearbox comprising a gearbox housing at least partially surrounding a cavity, an oil sump connected to the gearbox housing and surrounding another cavity, and a separating element separating the cavity from the other cavity and having a passage through which oil located in the cavity is fed into the other cavity. The passage is arranged in a plane at an intersection line between a first oil level upper side and a second oil level upper side. The oil is fed from the cavity into the other cavity exclusively through the passage. The separating element has a passage section and a separating section, the passage section protrudes from the separating section in the radial direction.

Abstract: A delivery device for a motor vehicle for delivering oil from an oil sump to a lubricating oil circuit of internal combustion engine has, as an oil pump, a double-stroke vane-type pump with positive guidance of vanes. A direct drive of the vane-type pump by means of the internal combustion engine is configured for an operating point P2. An increased or reduced oil demand is compensated by means of an activatable electric drive. A compact oil pump of very small dimensions may thus be used.

Abstract: Provided is a hydraulic supply structure. The hydraulic supply structure includes an inner pipe configured to form a first pipe path which is a part of a first hydraulic supply passage, an outer pipe configured to form a second pipe path which is a part of a second hydraulic supply passage between the inner pipe and the outer pipe, and an annular inner pipe holding portion and an annular outer pipe holding portion configured to fix the inner pipe and the outer pipe to a casing. Each of the outer pipe holding portion and the inner pipe holding portion is a part of a pipe holding member configured as an integral member.

Abstract: A gear system for a turbofan engine assembly includes a sun gear rotatable about an engine centerline, a non-rotatable ring gear, a rotating carrier that drives a fan, and a plurality of planet gears intermeshed between the sun gear and the ring gear. Each of the plurality of planet gears supported on rolling element bearings fit into the carrier. Each of the plurality of planet gears includes an inner cavity and a lubricant passage directed at the rolling element bearings. The carrier includes an outer scoop that receives lubricant from an outer fixed lubricant jet and feeds lubricant into the inner cavity and through the lubricant passage to spray lubricant on to the rolling element bearings. A geared turbofan engine assembly is also disclosed.

Abstract: An object of the present invention is to provide a chain drive system that can reduce sliding resistance between a chain and a guide shoe, minimize increase of sliding resistance over time, and reduce production cost. Provided is a chain drive system 100 including a plurality of sprockets 101 and 102 over which a chain 130 passes over, and one or more guides 110 and 120 that guide the chain 130. The guides 110 and 120 include integral or separate guide shoes 111 and 121 each having a chain running surface. The chain running surfaces include, in part thereof, a lubricated area 114 where a solid lubricant P is held.

Abstract: A planet carrier for supporting at least one planet wheel in a planetary gear for an adjustment unit for adjusting two components adjustable in relation to one another. The planet wheel comprises a planet wheel axle, which has first and second axle portions protruding beyond the planet wheel, and the planet carrier comprises a tubular main body with a passage that penetrates the main body, first and second support portions originating from the passage, where the first and second support portions are designed for the rotational accommodation of the first and the second axle portions. The planet carrier can include protrusions that fix the first and the second axle portions in the support portions.

Abstract: A shift lock structure of a shift lever, includes: an engaging lever provided at a lower end portion of the shift lever and rotated when the shift lever is rotated; a solenoid valve having a plunger extending in a direction intersecting a direction in which the engaging lever is rotated and configured to allow the plunger to be retracted or extracted depending on a shift stage; and a lock lever located in a rotation direction in which the engaging lever is rotated from a P-stage to another stage, and coupled with the plunger such that, when the shift stage is the P-stage, when the plunger is extracted and moved in an axial direction thereof, the lock lever blocks rotation of the engaging lever, implementing the shift lock.

Abstract: The present disclosure provides an electronic automatic transmission system which is able to be operated by a driver. The electronic automatic transmission system may include: an operating wheel configured to select a shift mode; a holder configured to support the operating wheel, wherein the operating wheel is configured to change the shift mode by rotating the operating wheel or pressing the operating wheel in a radial direction of the operating wheel, and to return to an original state after changing the shift mode.

Abstract: A vehicular shifter device includes: an operation member; a body portion which supports the operation member to be shiftable from a home position in a predetermined direction, and which causes the operation member after a shift operation to automatically return to the home position; and a control means which controls the range of a transmission on the basis of a shift operation of the operation member. The control means sets the range to a neutral range when the operation member is shifted from the home position in the predetermined direction. The control means switches the range from the neutral range to a travel range when the operation member is shifted from the home position in the predetermined direction again after the shift operation.

Abstract: The invention relates to a method for monitoring a functional state of a pressure-driven actuator which comprises an actuator compartment defined at least in portions by a flexibly deformable wall, the actuator being actuated by applying pressure to the actuator compartment by means of an operating pressure supply, a work process being carried out to actuate the actuator, which process is accompanied by the actuator transitioning from a starting configuration to an end configuration. The pressure the pressure applied to the actuator compartment is measured depending on time by means of a sensor apparatus during the transition from the starting configuration to the end configuration. The invention also relates to a pressure-driven actuator.

Abstract: A control device for a vehicle includes an electronic control unit configured to increase a disengagement-side instructed pressure such that an input rotation speed decreases when overspeeding of the input shaft occurs during a coast downshift of an automatic transmission. Overspeeding of the input shaft in a disengagement-side element that forms a gear stage before a downshift having a lower gear ratio than that after the downshift is suppressed.

Abstract: A shift device for a boat includes a lever which can be operated about a predetermined axis, and a lever operation suppression mechanism which suppresses an operation of the lever. The lever operation suppression mechanism includes a load applying portions (a first load applying portion and a second load applying portion) which apply different loads to the lever in a first operation period of operating the lever between a neutral position of the lever and a first position corresponding to a forward movement of the boat, and in a second operation period of operating the lever between the neutral position and a second position corresponding to a backward movement of the boat.

Abstract: The hydraulic piston forms a hydraulic chamber with a cylinder and has a cylindrical body which receives a seal and whose external cylindrical surface is housed with little clearance in the cylinder in such a manner as to leave an interstitial space, the cylindrical body being run through by a cooling and lubrication pipe which can be opened or closed by a cooling and lubrication valve which is moved by translation by a valve-actuator in such a manner that fluid can pass via a flow calibration opening from the hydraulic chamber to the interstitial space when the pressure existing in the hydraulic chamber is low and cannot pass when the pressure in the chamber is high.