Abstract: A transmission has a housing having a main axis with a retaining element fixed in the housing and forming a set having a predetermined number of radially extending and angularly equispaced guides. An output element rotatable in the housing about the axis is formed with an array having a number smaller than the predetermined number of radially inwardly open recesses axially adjacent the guides. An input element rotatable in the housing about the axis has a radial outer and generally circular peripheral surface centered on an axis radially offset from the main axis. Respective transmission elements radially displaceable in the guide grooves between inner and outer positions each have a shaft extending substantially parallel to the axis with a guide section engaged and radially shiftable in the respective guide groove, a driven section engageable in the recesses, and a drive section radially engageable with the input-element surface.

Abstract: The present invention refers to a conventional spur gear transmission or magnetic gear transmission, with a cycloidal configuration. The magnetic gears include contact points such that the mobile gear rolls on the fixed gear. Alternatively, a balance wheel is incorporated, which generates a centrifugal force opposite to the one associated with the mobile gear, of equal magnitude and on the same plane as this latter one, thereby completely eliminating the unbalancing of the mechanism. The balance wheel is mounted on the high-speed shaft in a manner similar to the mobile gear, and has the freedom to displace itself radially through centrifugal effect in the opposite direction to the eccentric position of the center of the mobile gear until it presses against a fixed track over which it rolls, concentric with the fixed gear with an equal force, opposite and collinear with that produced by the mobile gear.

Abstract: A speed reduction device includes front and rear stage speed reduction mechanisms. The speed reduction device includes a connecting shaft that connects the front stage speed reduction mechanism to the rear stage speed reduction mechanism; bearings that support the connecting shaft; an oil supply port that is formed on one side of front and rear stage sides of the bearings; and communication passages that make a receiving section, which is closer to the front stage speed reduction mechanism than the bearings in a casing of the speed reduction device, communicate with a receiving section, which is closer to the rear stage speed reduction mechanism than the bearings.

Abstract: A driving force distribution device includes a first friction roller that rotates together with a rotating member constituting a torque-transmitting path to the main driving wheel; a second friction roller that rotates together with a rotating member constituting a torque-transmitting path to the auxiliary driving wheel; and an inter-roller radial press section that presses the first and second friction rollers in radial directions of the first and second friction rollers into pressing contact with one another, to allow torque transmission between the first and second friction rollers, wherein the inter-roller radial press section sets a radial pressing force between the first and second friction rollers to limit torque input to the auxiliary driving wheel by allowing slippage between the first and second friction rollers when a maximum torque is inputted to the driving force distribution device under a condition that torque distribution to the auxiliary driving wheel is maximized.

Abstract: A device for dispensing a dental composition comprises a piston for extruding a component of the dental composition from a container. The device has a roller drive for displacing the first piston. The roller drive comprises cooperating first and second rollers, and each of the rollers have a roller surface with a radial rib profile. The rollers are arranged for rolling with their roller surfaces on one another. The invention may help providing for a relatively reliable and compact device.

Abstract: A torque distributor includes a friction-drive mechanism having a first roller rotatable together with a first rotary member, partly constituting a torque-transmission path to primary drive wheels, and a second roller rotatable together with a second rotary member, partly constituting a torque-transmission path to secondary drive wheels. Also provided is an eccentric-crank mechanism for revolving the second roller in a direction opposite to a rotation direction of power transmission of the second roller around an eccentric-shaft axis displaced from a second-roller rotation axis to produce a displacement of the second roller from a non-power-transmission position of non-frictional-contact with the first roller, thereby ensuring high-precision torque-distribution control with no reversal of a polarity of moment acting on a rotational-position-control system for eccentric cranks.

Abstract: A roller frictional transmission unit includes: a first roller; a second roller; an input shaft connected with a driving system of main driving wheels, and connected with one of the first roller and the second roller; an output shaft connected with a driving system of auxiliary driving wheels, and connected with the other of the first roller and the second roller; a thrust bearing arranged to position an input shaft side rotation section including the one of the first roller and the second roller and the input shaft, or an output shaft side rotation section including the other of the first roller and the second roller and the output shaft, with respect to a unit housing in an axial direction; and a low rigidity structure disposed in a thrust transmission path to the thrust bearing, and arranged to buffer a thrust.

Abstract: [Problem] A two-wheel?four-wheel drive switching for a traction-transmitting part time four-wheel drive vehicle in which a gear clutch for separating one of auxiliary driving wheels from a drive train is equipped can be carried out under a shock reduction. [Means for solving problem] In a case where a two-wheel?four-wheel drive switching request occurs during a traveling of the vehicle (step S11 and step S12), an operation of switching a traction-transmitting transfer from a non-transmitting state to a transmitting state is preceded (step S18 and step S22) and, thereafter, the gear clutch is engaged (step S21 and step S22) when a revolution speed difference ?Vw between main and auxiliary driving wheels is 0<?Vw<? along with an advance of the state switching of the transfer so that large shock and abnormal sound are not generated even if the gear clutch is switched from a released state to an engagement state.

Abstract: The multi-stage reducer includes a first-stage reduction part to which the rotation from a motor is input and a second-stage reduction part to which the rotation having undergone speed reduction by the first-stage reduction part is input. The second-stage reduction part is disposed on an outer circumference of the first-stage reduction part.

Abstract: A mechanical speed variator is provided with eccentric masses having a balanced structure. The variator includes a drive shaft, provided with a cam composed of a circular disk eccentrically mounted on the drive shaft, which drives the driven shaft in rotation with interposition of a series of eccentric masses, each of them being composed of a circular disk with eccentric circular hole in which another mass of lower dimensions is ratably housed. The larger mass is housed and rotates inside the eccentric hole of a ring coupled with bolts to a flange and counter flange, respectively mounted on the driven shaft and the drive shaft.

Abstract: A torque distributor includes a friction-drive mechanism having a first roller rotatable together with a first rotary member, partly constituting a torque-transmission path to primary drive wheels, and a second roller rotatable together with a second rotary member, partly constituting a torque-transmission path to secondary drive wheels. Also provided is an eccentric-crank mechanism for revolving the second roller in a direction opposite to a rotation direction of power transmission of the second roller around an eccentric-shaft axis displaced from a second-roller rotation axis to produce a displacement of the second roller from a non-power-transmission position of non-frictional-contact with the first roller to a radially-loaded power-transmission position of frictional-contact with the first roller.

Abstract: Under control of rotation of a crankshaft 41, a friction roller 32 is pressed against a friction roller 31 in a radial direction, so as to achieve torque transmission between the rollers 31, 32. An inter-roller radial pressing reaction is canceled as an internal force in bearing supports 23, 25, with no input to a housing 11. Each bearing support 23, 25 is formed with a constricted portion at a center section of the bearing support between bearing-fitting portions at end sections of the bearing support, for lowering support stiffness of the bearing support against the inter-roller radial pressing reaction.

Abstract: A wedge loading mechanism for an eccentric planetary traction drive in which a roller having a flexibly mounted shaft is positioned between two raceways forming a convergent wedge. Rotation of either of the two raceways wedges the roller within the convergent wedge squeezing the roller between the two raceways thereby transmitting rotational motion and torque between the two raceways. The flexibly mounted shaft generates differences between an effective supporting stiffness of the roller and an contact effective stiffness at the points where the roller contacts the two raceways. The difference in the effective stiffness allow the roller to operate efficiently at smaller convergent wedge angles.

Abstract: The present invention relates to a speed reduction device for preventing a rotational back-rush that includes: a rotary plate provided at the inside of a square casing; an external gear disposed in eccentrically tooth-coupling relation with the internal gear; operational grooves disposed at right and acute angles to the internal gear and the output shaft, at the outside of the rotary plate; eccentric shafts provided in the operational grooves to correspond to the eccentric quantity; an input shaft extended from any one of the eccentric shafts to the outside of the square casing; and eccentric parts provided in the eccentric shafts, the eccentric part for guiding the rotary plate when the eccentric part pushes the rotary plate.

Abstract: The wobbling inner gearing planetary gear system has planetary external gears and an internal gear with which the external gears internally mesh, a center axis of the system being located inside periphery of the external gears The method is a method of reducing angle transmission errors in the system, in which the number of teeth of the internal gear is X·n (X: even number of 4 or more; n: integer), and the difference in the number of teeth between the internal gear and external gears is 2. The external gears are superposed and machined to collectively form respective external gear teeth and through holes. The external gears are grouped into pairs and these pairs are circumferentially offset from each other by 360°/X around the center axis. One of each pair of the external gears is shifted parallel in 180° opposite direction away from the other one of each pair of the external gears.

Abstract: A simple planetary gear mechanism is provided with an automatic alignment function to support the planet gear to obtain a speed reducer having reduced backlash by a simple method. A planet gear is supported by a carrier pin that is in turn supported by a carrier. The carrier pin includes a crank portion that is eccentric by “e” relative to the axis center of the carrier pin with the eccentric angle being made variable. The planet gear is supported rotatably about the axis center of the crank portion. Consequently, with the eccentric angle being made variable, the axis center of the planet gear is automatically aligned in the radial direction upon assembly of each gear, thereby making it possible to minimize backlash only by incorporating a sun gear having a proper dimension.

Abstract: An eccentric planetary traction drive transmission in which a planetary roller is positioned between and in contact with an outer ring member and a sun roller member. Rotation of either the outer ring member or the sun roller member wedges the planetary roller within a convergent gap which squeezes the planetary roller between the outer ring member and the sun roll member. Friction between the planetary roller, the sun roller member, and the outer ring member transmits rotational motion and torque between the outer ring member and the sun roller member. An internal carrier with a plurality of bearings supports the sun roller member within the outer ring member.

Abstract: A second shift valve for a lock-up clutch is switched in response to supply of an R range pressure and a solenoid pressure from a low-and-reverse solenoid valve to selectively supply an output from a lock-up solenoid valve to a pressure reduction control valve or a lock-up control valve. The pressure reduction control valve regulates a line pressure at a small gain by the output from the lockup solenoid valve via the second shift valve. The first shift valve actuated by the solenoid pressure from the low-and-reverse solenoid valve selectively supplies a high R range pressure from a manual valve or an output from the pressure reduction control valve to the low-and-reverse brake. This enables accurate hydraulic control of the low-and-reverse brake and ensures the required torque capacity with simple arrangement.

Abstract: An eccentric planetary traction drive transmission in which a planetary roller is positioned between and in contact with an outer ring member and a sun roller member. Rotation of either the outer ring member or the sun roller member wedges the planetary roller within a convergent gap which squeezes the planetary roller between the outer ring member and the sun roll member. Friction between the planetary roller, the sun roller member, and the outer ring member transmits rotational motion and torque between the outer ring member and the sun roller member. An internal carrier with a plurality of bearings supports the sun roller member within the outer ring member.

Abstract: A gearless transmission is provided for transmitting rotational velocity from an input shaft to an output shaft without gears. The transmission includes an input shaft connected to a wedge. Both the input shaft and the wedge have rotational axes. The rotational axis of the input shaft is disposed at an angle with respect to the rotational axis of the wedge. As a result, rotation of the input shaft results in a processional motion of the axis of the wedge. The wedge engages an output plate which is connected to a universal joint which, in turn, is connected to an output shaft. The processional rotation of the wedge is transmitted to the output plate and, consequently, to the output shaft without the need for a geared or enmeshed relationship between the wedge and the output plate.

Abstract: The invention relates to a mechanical gearing. This comprises a frame, a first shaft mounted rotatably on the frame and carrying a pair of friction wheels which are disposed at a distance from each other and which have mutually facing friction surfaces together converging outward, a second shaft which is mounted on the frame parallel to but eccentrically relative to the first shaft and which carries a friction wheel which has an internal annular friction surface situated axially between the friction wheels of the first shaft, and a closed belt of mutually abutting push links. The belt forms on mutually opposite sides surfaces co-acting with the pair of friction wheels and on a radially outermost surface forms a surface co-acting with the single belt engaging wheel.

Abstract: A gearless mechanical transmission includes a housing which supports a high-speed shaft and a low-speed shaft along a main rotational axis. The housing also includes a precession link therein fixed for rotation about the high-speed shaft at an angle skewed with regard to the main rotational axis. A first cam surface is associated with the housing, a second cam surface with the low-speed shaft and a third and fourth cam surface with a precession link. Cam follower elements include rollers which establish rolling contact between the first and third and second and fourth cams respectively.