Abstract: A transmission system associated with a vehicle includes a shaft to rotate about an axis of rotation. The shaft is coupled to a gear set. The transmission system includes a target wheel to be coupled to the gear set and to rotate with the gear set. The target wheel includes at least one void. The transmission system includes a giant magnetoresistance (GMR) sensor spaced apart from the target wheel by a gap. The giant magnetoresistance (GMR) sensor is configured to observe the at least one void of the target wheel to determine a rotation speed of the shaft based on a giant magnetoresistance (GMR) effect. The transmission system further includes a rotating shell located in the gap between the target wheel and the giant magnetoresistance (GMR) sensor.

Abstract: The invention relates to an epicyclic reducer for a vehicle hub that includes: a housing; a sun gear arranged in the housing that includes sun teeth and is configured for coupling to an input; a plurality of planet gears, each of which includes planet teeth meshed with some of the sun teeth; a planet carrier that couples the planet gears to each other and is configured as an output; and a ring gear that includes ring teeth meshed with some of the planet teeth of each of the planet gears. The ring gear can be moved within the housing between a reduction position in which the planet gears are configured to rotate relative to the ring gear, and a direct drive position in which the ring gear is constrained to rotate with the planet gears.

Abstract: The application discloses a speed reducer and a fracturing apparatus, the speed reducer may be used to connect to a turbine engine and comprises a housing, a planet carrier, a connecting flange, a planet shaft, a planet gear, a sun gear, a ring gear, an input shaft and an output shaft; the housing may be connected to the planet carrier, the connecting flange may be connected to the planet carrier and may be used to connect to the turbine engine; the planet shaft may be connected to the planet carrier, the planet gear may be sleeved on the planet shaft, one end of the input shaft may be used to connect to an output end of the turbine engine and the other end of the input shaft may be sleeved with the sun gear which is engaged with the planet gear, the ring gear may be engaged with the planet gear and connected to the output shaft.

Abstract: A stirring, mixing and blending (SMB) apparatus includes a mixing container mountable on a base which houses the components and controllers for rotating a blade assembly within the container. The blade assembly includes a pair of substantially flat wings mounted on the opposite sides of a horizontal rod. The wings are generally rectangular with rounded corners and blunt edges. The wings are oriented at a downward angle relative to the horizontal rod which enhances the stirring, mixing and blending functions of the apparatus.

Abstract: A method actuates a vehicle drivetrain of a vehicle having a drive unit, in particular an electric motor, wherein the drivetrain has at least one first partial drivetrain which is assigned to a first output unit which transmits a torque between the drive unit and the first output unit, and has at least one second partial drive train which is assigned to a second output unit which transmits a torque between the drive unit and the second output unit. When a positive torque is transmitted, a load is applied to the drivetrain in a first direction, and when a negative torque is transmitted, a load is applied to the drivetrain in a second direction opposed to the first direction.

Abstract: Disclosed is a solution to the use of a speed limiter in a motorcycle that has a high capacity for acceleration, including a method for limiting the speed of a motorcycle using precise parameters of speed, acceleration and required engine torque and a single control button to manage the smart activation and deactivation of the limiter and to input new speed limits Vlim in a simple way. It thus allows the use of a speed-limiting system in a motorcycle that has a high power/weight ratio by avoiding the sources of interference with the riding and the effects liable to jeopardize its stability.

Abstract: Electric vehicle drive arrangement having input and output shafts (EW, AW) and a change-speed transmission (G). The transmission (G) has two planetary gearsets (PS1, PS2) and first, second and third shifting elements (SE1, SE2, SE3) for engaging first, second and third gears (G1, G2, G3). The first planetary gearset (PS1) comprises a first sun shaft (SO1), a first ring gear shaft (HR1) and a first carrier shaft (ST1). The second planetary gearset (PS2) comprises a second sun shaft (SO2), a second ring gear shaft (HR2) and a second carrier shaft (ST2). The first carrier shaft (ST1) is connected to the second ring gear shaft (HR2), and the first sun shaft (SO1) forms the transmission input shaft (EW). The second carrier shaft (ST2) forms the transmission output shaft (AW). The first shifting element engages first gear, the second shifting element engages second gear and the third shifting element engages third gear.

Abstract: Provided is a planetary geared reducer with a dual reduction ratio. The reducer includes: a housing provided with a ring gear, and having one side where an input shaft is rotatably inserted and an opposite side where an output shaft is rotatably inserted; a sun gear provided at the input shaft; at least one planetary gear engaged between the sun gear and the ring gear; and a high reduction carrier provided at the output shaft to rotatably support the planetary gear by a rotation pin, wherein the high reduction carrier is coupled with a low reduction carrier, the low reduction carrier has a through-hole where the sun gear passes, the through-hole has a low reduction gear engaged with the sun gear, and the sun gear is selectively interlocked with the planetary or low reduction gear according to a forward or rearward movement of the input shaft to perform dual reduction.

Abstract: The invention relates to a switching module for coupling a drive module to an output module in an automatic transmission where the drive module and the output module are rotatably mounted around a common transmission axis. The switching module includes a switching unit rotatably mounted about the common transmission axis and couples with one of the modules in a movable and rotationally fixed manner. The switching unit includes an element for coupling the drive module and the output module in a force-fitting manner and a power transfer element for coupling the drive module and the output module in a form-fitting manner.

Abstract: A powertrain for a vehicle may include a first planetary gear set configured such that a first rotation element of three rotation elements thereof is connected to an input shaft; and a first clutch device and a second clutch device provided in series between a second rotation element and a third rotation element of the first planetary gear set to directly connect the second rotation element and the third rotation element, wherein the second clutch device is configured to selectively lock the third rotation element; and the second rotation element of the first planetary gear set functions as an output element of the first planetary gear set.

Abstract: There is provided a transmission device comprising a rigid casing configured to be mounted perpendicularly on a pair of parallel rotatable driving and driven shafts. Annular driving and driven gears are provided in the casing. The annular driving gear is adapted for rotating simultaneously with the driving shaft, and is also adapted for forwarding rotational motion of the inner section to a transmission device. The annular driven gear is adapted for engaging and rotating simultaneously with the driving shaft and sliding over the same, and for forwarding to the inner section rotational motion received from the transmission device. The transmission device is rotatively connected to the annular driving and driven gears for transmitting rotational movement of the driving shaft to the driven shaft. There is also provided a portable boring-welding apparatus using this transmission device and a method for rotating a driven shaft using a parallel driving shaft.

Abstract: In friction engagement device having forward clutch 5 and clutch operation pack 6 controlling engagement/disengagement operation of the forward clutch 5, the clutch operation pack 6 has hydraulic piston 61, engagement pressure piston chamber 62, snap ring 64, diaphragm spring 65 and ball lock mechanism BL. The diaphragm spring 65 provides biasing engagement force to the forward clutch 5 at a clutch side of the hydraulic piston 61. The ball lock mechanism BL restrains movement, in a disengagement direction, of the hydraulic piston 61 at a position where the forward clutch 5 is in an engagement state by the biasing engagement force by exerting ON pressure on the engagement pressure piston chamber 62, and after restraining the movement of the hydraulic piston 61, maintains the restraint of the disengagement direction movement of the hydraulic piston 61 even when the ON pressure of the engagement pressure piston chamber 62 is drawn.

Abstract: A multispeed drive unit (10) comprising a rotary input (27) positioned to be driven by a power source and disposed at an input side of the drive unit (10); a rotary output (28) positioned to drive a driven unit and disposed at an output side of the drive unit (10), a transmission operably interposed between said rotary input (27) and said rotary output (28), said transmission having a gear (20) moveable between a high-reduction configuration and a low-reduction configuration, a first friction clutch (40) operable to fix said gear (20) in said high-reduction configuration, whereby said transmission is operable to reduce a speed of said rotary output (28) relative to said rotary input (27) when said first friction clutch (40) is engaged, and a second friction clutch (60) operable to fix said gear (20) in said low-reduction configuration, whereby said transmission is not operable to reduce the speed of said rotary output (28) relative to said rotary input (2) when said second friction clutch (60) is engaged.

Abstract: A multi-stage planetary transmission includes a transmission housing and a first planetary stage at least partially positioned in a transmission housing. The first planetary stage includes a first stage ring gear, a first stage carrier, and a plurality of first stage planet gears supported by the first stage carrier. A motor output pinion is engaged with each of the first stage plant gears. The transmission further includes a second planetary stage positioned downstream of the first planetary stage to receive torque from the first planetary stage and a shift mechanism operable to move the first stage ring gear between a first position, in which the first stage ring gear is rotatably fixed relative to the transmission housing for enabling the first planetary stage, and a second position, in which the first stage ring gear is coupled for co-rotation with the first stage carrier for disabling the first planetary stage.

Abstract: A multi ratio drive including a first drive chain having a first drive chain engaged state and a first drive chain disengaged state; and a second drive chain having a second drive chain engaged state and a second drive chain disengaged state. The first drive chain drives the axle with a first gear ratio between the drive shaft and the axle when the first drive chain is in the first drive chain engaged state and the second drive chain is in the second drive chain disengaged state; the second drive chain drives the axle with a second gear ratio between the drive shaft and the axle when the second drive chain is in the second drive chain engaged state and the first drive chain is in the first drive chain disengaged state; and the first gear ratio is different from the second gear ratio.

Abstract: The invention relates to an internal gear hub for a bicycle includes a rotating cam which locates against a retractable cam follower within a multiple speed internal gear hub. The position of the cam determines which speed is selected. The cam is actuated by reversing the direction of the drive input (pedaling backwards) by a fixed or predetermined amount of rotation. The cam follower is retracted when the drive input is reversed and when the rotation is greater than that required to rotate the cam into the next position. When the cam follower retracts, the cam will return to a default position and will select a default speed.

Abstract: A switchable gear in a handheld power tool has at least two gear stages which are to be engaged via an adjustable switching member, the switching member being in a latched position via a retaining element fixedly held against a housing in a first gear stage. Furthermore, a spindle for receiving a tool may be driven via an axially spring-loaded gear wheel, the gear wheel being axially supported on the retaining element on the side opposite the switching member.

Abstract: A power tool is provided with a device for automatically switching transmission output, including at least one stage of transmission part having a sun gear, a planetary gear carrier, and a gear ring for transmission, a sensing system having a sensing component for sensing variation of operating condition, and a control device cooperated with the sensing system for controlling the transmission output of the transmission part. A first transmission output is generated when the sun gear, the planetary gear carrier, and the gear ring in the same stage are in a first transmission state, and a second transmission output is generated when the variation of operating condition received by the sensing component reaches a predetermined value and then being fed back to the control device by the sensing system.

Abstract: The invention relates to a gear train unit comprising a plurality of planetary gear train stages, which are connected one after the other and which each comprise a ring gear (4, 4a, 4b), a sun gear (2a, 21, 21a) and a plurality of planet gears (3, 3a, 3b) supported on a planet carrier (5, 5a, 6), wherein the sun (2a, 21, 21a) of each following planetary gear train stage is formed by the planet gear carrier (5, 5a) of the preceding planetary gear train stage. The gear train unit comprises a drive element (2), which forms the sun gear (2a) of the first planetary gear train stage, and an output element (17), which is connected in a torsionally rigid manner to the planet gear carrier (6) of the last planetary gear train stage. The gear train unit can be shifted in such a way that either a first or a second gear ratio can be set.

Abstract: An electric power tool includes a motor; a speed reducer for transferring a rotational power of the motor at a reduced speed; and a reduction ratio changing unit for changing a reduction ratio of the speed reducer. The speed reduction mechanism includes an axially slidable changeover member and a gear member, the changeover member being engaged with or disengaged from the gear member depending on an axial slide position thereof. The reduction ratio changing unit includes a shift actuator for axially sliding the changeover member, a driving state detector for detecting a driving state of the motor, a slide position detector for detecting a slide position of the changeover member and a controller for driving the shift actuator and for temporarily decreasing or increasing a rotational power of the motor depending on detection results of the driving state detector and the slide position detector, respectively.

Abstract: In a power tool, a tubular gear case is disposed frontwardly of a motor and configured to accommodate a planetary gear speed reduction mechanism, a tubular motor bracket is attached to the motor and configured to connect the motor and the gear case together, and at least one pin is pierced through the motor bracket and the gear case to connect the motor bracket and the gear case together. The pin is engaged with a first-stage internal gear located at a first stage of the planetary gear speed reduction mechanism whereby the first-stage internal gear is restrained from rotating and located in position in an axial direction thereof.

Abstract: A handheld power tool with a shiftable mechanism, which is adjustable between two operating positions, has a coupling spring that is coupled with an adjustable shifting member of the mechanism. The coupling spring is embodied as a metastable spring.

Abstract: A planetary gear set for a power tool is described, in particular for an electrically operated hand-held power tool. The planetary gear set has multiple gear stages, the planetary wheels of a gear stage, to which a movable annulus gear is assigned, being at least supported on shafts via rolling elements, the rolling elements being held on an assigned planet carrier.

Abstract: A motor assembly for use in a surgical tool, has a motor and a gear train. The gear train has an output shaft, a fixed ring gear, a movable ring gear, a cover, and a multi-stage planetary gear set. Each gear stage has a sun gear, a carrier, and planet gears mounted on one side of the carrier. The planet gears are in mesh with a sun gear and either the fixed ring gear or the movable ring gear. The movable ring gear has inner teeth formed on an inner peripheral surface and one of the carriers has outer teeth formed on an outer peripheral surface.

Abstract: An electric power tool includes a cylindrical reducer case accommodating the speed reduction mechanism. The speed reduction mechanism includes a planetary gear train and a movable member which is axially slidable to be engaged with or disengaged from the planetary gear train. The electric power tool includes the reducer case including a slide hole formed through a sidewall of the reducer case and axially extended and a rotary plate which is rotatable around a periphery of the reducer case about the axis, the rotary plate including an operation slot formed axially obliquely and overlapped with the slide hole; a supporting member radially outwardly protruded from the movable member and extended through the slide hole and the operation slot; and a biasing unit for applying a pressing force to the supporting member in a moving direction of the supporting member when the rotary plate is rotated to a position.

Abstract: In a handheld power tool having a planetary gear set which is at least switchable between a first and a second gear and which is assigned a switching annulus gear which is at least shiftable between a first and a second switching position and which has the first switching position in the first gear and the second switching position in the second gear, the switching annulus gear is assigned a synchronization unit which is designed to enable a synchronization of the switching annulus gear with a planet carrier or with a blocking element of the planetary gear set when the switching annulus gear is shifted between the first and the second switching position to switch over the planetary gear set.

Abstract: A switchable planetary gearbox in a hand-held power tool includes multiple planet carriers having associated planet wheels, and is to be displaced between at least two gear ratios, such that the gear ratios are to be engaged via a displaceable switching ring gear. At least three planet carriers having associated planet wheels are provided axially behind one another, such that in a position fixed with respect to the housing, the switching ring gear is rotationally coupled to the planet wheels on the second-stage planet carrier and simultaneously to the planet wheels on the third-stage planet carrier.

Abstract: A switchable gear in a handheld power tool has at least two gear stages which are to be engaged via an adjustable switching member, the switching member being in a latched position via a retaining element fixedly held against a housing in a first gear stage. Furthermore, a spindle for receiving a tool may be driven via an axially spring-loaded gear wheel, the gear wheel being axially supported on the retaining element on the side opposite the switching member.

Abstract: One aspect of the invention includes a speed changing device which can be switched from a high-speed low-torque output state to a low-speed high-torque output state. In the high-speed low-torque state, a second stage internal gear rotates together with a first stage carrier. The low-speed high-torque output state is caused as the second stage internal gear is disconnected from the first stage carrier so as to be restricted from rotating. The timing of resetting the speed changing device is shifted relative to the timing of stopping the electric motor by an OFF operation of the switch lever with a delay mechanism, so that the second stage internal gear is engaged with the first stage carrier after the rotation through inertia is stopped, whereby its impact is reduced.

Abstract: A transmission comprising a first compound planetary gear set having a first brake engaged with a sun gear, a second compound planetary gear set having a second brake engaged with a ring gear, the first compound planetary gear set and the second planetary gear set axially engagable through a first clutch and a second clutch, and the transmission input and transmission output disposed coaxially and configured to input and output torque from the same side of the transmission.

Abstract: An automatic speed reduction ratio switching apparatus is equipped with a sun gear connected to an input shaft, first and second carriers connected to a feed screw shaft, planetary gears meshed with the sun gear and which are mounted rotatably in the first and second carriers, and an internal gear meshed with the planetary gears and which is capable of movement in an axial direction. A packing member is arranged between the internal gear and the second carrier, for regulating movement in the axial direction of the internal gear, while enabling movement of the internal gear in the axial direction when a thrust force is applied at or above a predetermined value.

Abstract: A transmission assembly is powered by an electric motor and includes a transmission having an outer ring gear, a connector moveable relative to the outer ring gear between a first position, in which the connector is rotatable with the transmission in response to torque received from the motor, and a second position, in which the connector and the outer ring gear are non-rotatable, and a control mechanism operable to detect the operating current of the motor and compare the operating current to a threshold current. The control mechanism is operable to move the connector from the first position to the second position in response to the motor operating current exceeding the threshold current.

Abstract: An operating mechanism by which the linear movement of a gearshift cable is converted into a rotational movement of an operating sleeve and transmitted to the interior of a bicycle multispeed gear hub.

Abstract: A power tool with a housing, a transmission and a switch mechanism. The switch mechanism has an actuator, a rail, a switch and first and second springs. The actuator is non-rotatably but slidably coupled to the housing for movement along a longitudinal axis of the transmission between a plurality of positions to selectively engage one or more members of the transmission at each of the positions such that the transmission operates in one of a plurality of different overall speed ratios. The rail is fixedly coupled to the actuator and is received through the switch such that the switch is slidably mounted on the rail. The first and second springs are configured to bias the switch relative to the actuator in different directions.

Abstract: A transfer case includes an input shaft, first and second output shafts, and a planetary gearset including a sun gear, a ring gear and planet gears rotatably supported on a carrier coupled to the first output shaft. A collar is driven by the sun gear and selectively drives the carrier. The ring gear is moveable between first and second positions. The collar is coupled to the ring gear for movement therewith between first and second positions. The collar is operable in its first position to couple the sun gear to the carrier and operable in its second position to be released from engagement with the carrier. The ring gear is operable in its first position to be released from coupled engagement with a stationary member and operable in its second position to be coupled to the stationary member. A mechanism moves the ring gear between its first and second positions.

Abstract: A transmission mechanism includes a first gear unit having an axially-movable ring gear and a second gear unit having an axially-movable fixing ring. The fixing ring includes first and second protrusions on two sides, respectively. When the ring gear moves, the first inner teeth and the outer teeth of the second planet gear disk are engaged with each other or disengaged from each other. When the fixing ring moves, the first protrusions and the first positioning ridges are engaged with each other or disengaged from each other, or the second protrusions and the second positioning ridges are engaged with each other or disengaged from each other. By the different combinations of the statuses due to movement of the ring gear and the fixing ring, the input speed from the motor gear is transferred into four different speeds which is output from an output shaft.

Abstract: A multi-gear mechanism includes first and second gear sets, an output set, multiple first planet gears pivotably connected between the first and second gear sets, a first gear ring having internal teeth and external teeth, multiple second planet gears cooperated with the internal teeth of the first gear ring, a second gear ring having internal teeth and side teeth, an operation gear ring and a motor gear. The motor gear extends through two central holes of the first and second gear sets, and the first and second planet gears are engaged with the motor gear. The operation gear ring is connected with the second gear ring which drives the operation gear ring to move axially. The motor gear drives the output set at low speed, constant speed or high speed when the operation gear ring and the second gear ring are operated to engage with different gears.

Abstract: A hand-held power tool has a handle, a least one two-speed transmission, at least one switch element for shifting the transmission between various gear ratios, wherein a distance between the switch element and a gripping region of the handle provided for placement of an operator's hand is less than or equal to a maximum finger extension range.

Abstract: An electrical tool includes a multi-stage gear transmission (10) located in the gear transmission housing (6) and having at least two axially displaceable indexing gear (42a, 42b), a shifting device (12) for shifting the gear transmission from one stage to another stage and having a shifting slide (14) linearly displaceable between different shifting positions, and at least two connection elements (32) for connecting the shifting slide (14) with respective indexing gears (42a, 42b), with the shifting slide (14) having a tracing profile (20) having two control tracks (22, 24), and the connection elements each having a first and second tracing sections (30a, 30b) to which the tracing profile (20) applies a shifting force in stages and which are arranged on opposite sides of a pivot axis (SA) of a respective connection element (32).

Abstract: A device for reversing a steering movement of a steering wheel shaft of a vehicle includes a switching element movable between two switching positions to activate or deactivate the reversal of the steering movement. A mechanical actuating device includes a shaft which is rotatable in different rotational directions, and a slide for actuating the switching element. The slide can be moved along the axial direction of the shaft as a function of the rotational direction of the shaft in order to transfer the switching element between the switching positions.

Abstract: A manual helical planetary transmission comprises a housing, a sun gear, a planet carrier with helical planetary gears and an axially displaceable ring gear which can be coupled to the housing or to the planet carrier. The transmission provides a compact and easy-to-produce solution for locking the gears. For this purpose, first saw-tooth coupling teeth are provided on both sides of the fronts of the ring gear and have a gently sloping first profile. Second saw-tooth coupling teeth provided on the housing and the planet carrier have a gently sloping profile and fit into the first coupling teeth. In the respective gear, the peripheral forces acting upon the ring gear force the gently sloping first profiles of the first coupling teeth against the gently sloping first profiles of the second coupling teeth on the housing or the planet carrier, thereby frictionally keeping the ring gear in the respective engaged position.

Abstract: A transmission including a ring gear engageable with clutch teeth. A shift fork connected to a cam roller is engageable with the ring gear. The cam roller includes at least one V-shaped groove, and an element is disposed between the V-shaped groove of the cam roller and a base of the shift fork such that rotation of the cam roller translates into displacement of the shift fork and the ring gear.

Abstract: Variable motion control devices and methods of use. The devices and methods relate to providing an output, such as a rotational shaft output, transmitted from a rotational shaft input, with the output varying based on a control input. The devices and methods are used, for example, to provide a variable output for use with a compressor, power take off, or transmission or differential application. To provide the variable output, the devices and methods include use of mechanical component systems, such as spur gear planetary systems, ring gear planetary systems, bevel gear arrangements, or combinations of such features. The control input is implemented, for example, by arrangements of bindably meshed gears, tension between pulleys joined by belts or similar arrangements of sprockets and chains, use of magnetic clutches, hydraulic or pneumatic controls, or braking devices.

Abstract: A power tool with a housing, an electric motor having an output shaft that provides a first output torque, a first gear reduction element driven by the output shaft to provide a second output torque, a second gear reduction element, which can be operated in active and inactive modes, driven by the first gear reduction element to receive the second output torque and to provide a third output torque, a third gear reduction element, which is operable in active and inactive modes, driven by the first gear reduction element to receive the second output torque and to provide a fourth output torque, an output spindle operably driven by the second gear reduction element or the third gear reduction element, and a shift actuator. The shift actuator is employed to position the second and third gear reduction elements to achieve at least three overall speed ratios.

Abstract: Helical gears, which are provided for a sun gear, planet gears, and an internal gear, have helix angles ? of not less than 25 degrees and not more than 45 degrees. Pawls provided for lock sections and internal gear lock receiving sections of the internal gear have rising angles ?, respectively, that satisfy the relational expression, 0 ?tan ?<(?·di)/{dp·tan(90??)}, wherein ? is the helix angle of the sun gear, ? is the screw efficiency of the sun gear as a sliding screw, dp is the pitch circle diameter of the sun gear, and di is an outer diameter of the internal gear defining a center of application of torque of the pawls.

Abstract: Range gearbox for motor vehicles adapted to be connected to the output side of a basic gearbox and including planetary gear (7), enclosed in a housing (3), with a sun wheel (9) arranged on an input shaft (5) and engaged with planet wheels (10). The ring gear (14) is selectively lockable in order to establish gearing between the input shaft and the output shaft. Interacting tooth faces of the planetary gear (7) are angled in such a manner in relation to the longitudinal axis of the input shaft (5) and the output shaft (8) so that an axial force arises on the ring gear (14) from gear speed changes during synchronizing, and this force, at least on shifting to the low range position, tends to move the ring gear in the same direction as an external shifting force.

Abstract: A variable speed transmission that changes the output speed of a power tool in response to an increase in torque. The transmission includes a first transmission portion, a second transmission portion, and an annular connector. The annular connector may move via a spring and a control mechanism between a first position and a second position to vary the power tool output between a first and a second speed.

Abstract: The present invention provides a final drive for a vehicle including a compound gear set comprising an input, an output and first and second epicyclic gear sets, each epicyclic gear set comprising a sun gear, at least one planet gear, a planet carrier and a ring gear. The sun gear of the first epicyclic gear set in the final drive is rotatably coupled with the ring gear of the second epicyclic gear set. The final drive finds particular application in tracked vehicles which must be able to operate at both low torque, high speed and high torque, low speed conditions, for example in earth moving applications. Use of one or more final drives in a tracked vehicle gives the ability to operate in these two conditions without the need for potentially complicated and expensive modification of the tracked vehicle's present transmission.

Abstract: A portable power tool with a housing, a motor having a motor output member, a driven member and a transmission. The transmission, which is located in the housing, is configured to receive a rotary input from the motor output member and to produce a rotary output that is transmitted to the output spindle. The transmission has a plurality of planetary transmission stages, each of which including a ring gear, a planet carrier and a plurality of planet gears that are supported by the planet carrier for meshing engagement with the ring gear. The transmission further includes at least one member that may be configured in a first condition, which renders at least one of the planetary transmission stages operable in an active mode, and a second condition, which renders at least one of the planetary transmission stages operable in an inactive mode. The transmission is operable in at least three overall speed reduction ratios.

Abstract: The invention concerns a gear motor (1) with a fail-safe device (2) consisting of a housing (4), an electromotor (3), a reduction gear (5) with at least one planetary gear (6), an electromagnetic clutch (11) and an output gear shaft (13), wherein the planetary gear (6) has an internal gear. The internal gear is in mesh with at least one planetary wheel (8) and is fixed in its operation relative to the housing (4). The planetary gear comprises the electromagnetic clutch (11), a magnetically conductive armature and a magnetically conductive stator (21) in which an electromagnetic coil (15) is arranged. During the application of current to the electromagnetic coil (15) the internal gear (10) is secured against turning. The task of the invention is to provide for a reliable operation of the fail-safe device in a gear motor of such kind using less construction space and less number of components thus enabling simple assembly.