Abstract: A geared infinitely variable transmission (GIVT) to provide a continuous output-to-input speed ratio from zero to a certain value is designed, and its working principle is illustrated. Crank-slider systems are used in the GIVT; the output-to-input speed ratio is changed with the crank length. Racks and pinions, controlled by planetary gear sets, are used to change the crank length when the cranks are rotating. One-way bearings rectify the output speeds from different crank-slider systems to obtain the output speed of the GIVT. Noncircular gears are used to minimize variations since the crank-slider systems can introduce variations of the instantaneous speed ratio. A direction control system is provided using planetary gear sets.
November 5, 2013
Date of Patent:
December 29, 2015
THE UNIVERSITY OF MARYLAND BALTIMORE COUNTY
Abstract: Apparatus and method for controlling an unswept volume in a piston system. The method includes rotating a shaft around a rotation point to drive a piston within a cylindrical volume in a periodic manner, modifying the stroke length of the piston, and moving the center of the shaft relative to the cylindrical volume such that a change in an unswept volume or compression ratio is controlled.
December 5, 2002
Date of Patent:
June 1, 2004
Halliburton Energy Services, Inc.
Jim B. Surjaatmadja, Stanley V. Stephenson
Abstract: A rotational power input is converted into a linearly oscillating power output through the use of counter-rotating nested eccentrics. The outer eccentric is connected to an input end of a connecting rod, which is in turn connected at an output end thereof to a piston of a piston pump. The piston is constrained to translational movement along an axis D. Drive gears are rotationally fixed to each of the eccentrics and geared to each other through an intermediate pinion having a rotational axis B. An angular position &bgr; of the pinion axis B relative to the axis D determines the output oscillation stroke length and flow rate of the pump. An actuator is geared to a pinion bracket that holds the pinion. The actuator can be actuated on-the-fly to alter the angle &bgr; and pumping rate of the pump.
Abstract: A stroke drive, particularly for displacement piston pumps, has a first eccentric (8) on which a second eccentric (9) is mounted. A push rod bearing (10) is connected to the second eccentric (9). The eccentrics (8, 9) are connected to each other by way of an intermediate drive (17) which conveys a synchronous rotation to the eccentrics. An adjusting device (16) serves to change the relative position of the eccentricities (e1, e2) of the eccentrics (8,9) relative to each other. In this manner the length of the stroke is steplessly adjustable from a maximal value to a minimal value.
Abstract: The present invention relates to a drive assembly, in particular a motor pump assembly for slip-controlled brake systems, with a device for transforming rotatory into translatory movements, including a drive shaft which is movably guided in a housing, and an eccentric device which is associated with the drive shaft. In order to be able to change the dimension of the eccentric, it is provided that the eccentric device is formed of two eccentrics which are turnable relative to each other and are in mesh with each other in a form-fit manner, so that at least an eccentric sum dimension formed from the individual eccentric dimensions of two eccentrics, respectively, can be set variably.
Abstract: To allow compact design of a wiper system equipped with a wiping angle varying assembly which comprises an actuating motor, an eccentric cam member provided in a path of transmitting the movement of the output end of a wiper motor to a wiper arm, and a control unit for activating the actuating motor so as to move the eccentric cam member and thereby change the range of angle of the wiping movement by altering a configuration of a linkage structure provided between the wiper motor and the wiper arm, the control unit is adapted to activate the eccentric cam member with such a timing that the force transmitted through the linkage structure from the wiper motor to the wiper arm tends to assist the force produced by the actuating motor to move the eccentric cam member in the required direction. Thus, the requirement of the power output of the actuating motor can be reduced, and the actuating motor can be substantially reduced in size.
Abstract: A radial-plunger-type hydraulic pump or motor includes a W-mechanism comprising a first internal gear relatively rotatably mounted on a main shaft, an external gear rotatably mounted on a supplementary shaft and held in mesh with the first internal gear, and a second internal gear rotatably mounted on an auxiliary shaft and held in mesh with the external gear. The first and second internal gears have the same number of gear teeth, and the supplementary shaft and the auxiliary shaft can revolve around the main shaft. When the auxiliary shaft revolves around the main shaft while the first internal gear is being held against rotation, the second internal gear does not rotate about its own axis, but revolves with the auxiliary shaft around the main shaft. The plungers of the radial-plunger-type pump or motor are allowed to reciprocally move in identical strokes, and no thrust load is applied between the plungers and the cylinders in which the plungers reciprocally move.
Abstract: An oscillating rachet style continuously or infinitely variable transmission is disclosed herein, that is, one which, in its operation, relies on a plurality of different successive intermediate rotations that vary in speed and direction in accordance with their own respective oscillatory waveform, each waveform being out of phase with one another in a predetermined way. These intermediate rotations are used to convert the rotational input to a plurality of uni-direction output rotations, without the aid of any over-running clutches. These later outputs vary in speed in accordance with their own respective waveforms and are used to produce a modified rotational output.
Abstract: A wiper apparatus for a vehicle windshield having a linkage pivotably attached to a main driving lever. Linkage is also coupled to a motor to rotate main lever for rotating a main shaft limit positions for selecting resting place of wiper blade. An eccentric cam is rotatably mounted to the main shaft with an intermediate member rotatable relative to the cam and attached to the linkage. A driving mechanism rotates the cam to adjust the position of the linkage relative to the driving lever which in turn determines the upper and lower position of wiper blade.
Abstract: A crank driving device for a press designed in serial type eccentric structure. An eccentric element of crankshaft connected to a connecting rod, and an eccentric mechanism to provide a second eccentricity, are separated in the axial direction of the crankshaft. The opposite ends of crankshaft are provided, in respective eccentric holes in a pair of rotatable bodies which rotate synchronously on a basic axial line. The crankshaft is axially displaceable between a position in which it rotates in synchronism with the rotatable bodies and a position in which the crankshaft and the pair of rotatable bodies can be rotated relative to each other. The eccentricity of the device is adjusted by rotating crankshaft and pair of rotatable bodies, relative to each other, and then maintaining the relative angle of the crankshaft and the pair of rotatable bodies at constant value by connecting means after adjustment.
Abstract: A mechanism for use in linear friction welding has a drive-shaft (10) rotatable about a first longitudinal axis (12). An eccentric portion (10A) for locating a cam member (18) has a second longitudinal axis (16) spaced a distance d from the longitudinal axis (12) of the drive-shaft (10). The cam member (18) has a third longitudinal axis (20) spaced distance d from the second axis (16) of the cam member (18). A connecting-rod (24) is located via a big-end bearing (26) on the periphery of the cam member (18). When the drive-shaft is rotated with the third axis (20) of the cam member (18) displaced from the longitudinal axis (12) the connecting-rod reciprocates. If the cam member (18) is rotated about the second axis (16) of the eccentric portion (10A) until the longitudinal axis (12) and the third axis (20) of the cam member (18) are coincident the connecting-rod stops reciprocating.
Abstract: A transmission is provided for a machine that manufactures a workpiece, later to serve as an electrode, by means of a form grinding tool. The tool has a similar spatial shape to that of the workpiece. The drive generates between the tool and the workpiece an orbital motion with changeable eccentricity and which orbital motion is necessary for a grinding or abrading process. A device, which can be structured as a transmission, an electrical control circuit, or as displaceable idling rollers, alters the eccentricity and is in constant operative connection with the driving side and power take-off side of the transmission. In this way there is obtained a constant setting or a cyclical adjustment of the eccentricity throughout the orbital movement. Furthermore, the orbital movement can describe non-circular patterns so that Lissajou patterns can be generated.
Abstract: A grinder wheel table feed apparatus converts rotation of a table driving motor into reciprocation movement of a grinder wheel table through a ball-screw mechanism to thereby impart a traverse movement to the grinder wheel table between a non-working position and a working position. The rotation of a reciprocation axle drive motor is converted through an eccentric cam into an oscillation movement of the grinder wheel table when the table is in its working position. A drive control system includes an encoder operable to read the rotational position of the reciprocal axle drive motor, and a control device effective to stop the eccentric cam at a predetermined eccentric angular position.
Abstract: A grinder wheel table feed apparatus which converts a rotation of the table driving motor into a reciprocation movement of the grinder wheel table through a ball-screw mechanism and exerts a traverse movement to the table between a stand-by position and a working position. Additionally, a device of the invention converts a rotation of a reciprocation axle drive motor into a reciprocal movement of said table through an eccentric cam, and it also exerts an oscillation operation to the table in its working position. A drive control means of said eccentric cam is comprised of an encoder operable to read a rotation position of the reciprocal axle drive motor and to control same through a control device so as to be effective to stop the eccentric cam at a predetermined angle.
Abstract: The asphalt laying machine comprises a rear body divided into sections with smoothing and compacting units suspended through vibration dampers in the frame. Each unit comprises an intermediate part and a smoothing part interconnected by means of a rear shaft bearing and a front connecting rod connected to an eccentric. By virtue of this interconnection an elliptical movement is transferred to the smoothing part during operation of the machine, and this movement produces a heavy tamping at the front edge, a smoothing and vibrating effect at the intermediate area of the ironing plate, and a succeeding tamping and polishing effect at the rear edge area. The tamping foot of a scraper plate suspended on the intermediate part tamps laid asphalt synchronously in opposition to the tamping plate of the ironing plate by virtue of reaction forces transferred through the intermediate part.
Abstract: A vibrating apparatus e.g. for shaking the forming wire of a paper machine, comprising a body (1) and a drive shaft (2) rotatably mounted in the body. The drive shaft supports an eccentric bushing (3) displaceable along but nonrotatably fixed to said drive shaft. A reciprocating rod (9) positioned transversely with respect to the drive shaft is provided with a ring-shaped end (10) rotatably mounted around an outer mantle surface of said bushing stationary in the axial direction (D) of said bushing. The apparatus further comprises adjusting means (11-20) for displacing said bushing along the drive shaft in its axial direction in order to adjust the eccentricity between the drive shaft and the ring-shaped end of the reciprocating rod.
Abstract: A phase and stroke control apparatus for the pistons of a Stirling engine includes a ring on the end of each piston rod in which a pair of eccentrics is arranged in series, torque transmitting relationship. The outer eccentric is rotatably mounted in the ring and is rotated by the orbiting ring; the inner eccentric is mounted on an output shaft. The two eccentrics are mounted for rotation together within the ring during normal operation. A device is provided for rotating one eccentric with respect to another to change the effective eccentricity of the pair of eccentrics. A separately controlled phase adjustment is provided to null the phase change introduced by the change in the orientation of the outer eccentric, and also to enable the phase of the pistons to be changed independently of the stroke change.
Abstract: An indexing apparatus operated by a unidirectionally rotating drive shaft. The drive shaft and a driven member are rotatingly supported by a base in a spaced apart manner. An interconnecting link extends between the drive shaft and the driven member and is pivotally pinned in an offset manner at a first end to the drive shaft. A second end of the interconnecting link is pivotally pinned in an offset manner to the driven member. When the drive shaft rotates it oscillates the driven member in opposite first and second directions through an arc. A releasable engaging device carried by the driven member releasably engages an index member rotatably carried by the base.
Abstract: A drive to reciprocate a vertical support member such as a shaft includes a journal support assembly which carries a lower end of the shaft while allowing rotational movement of the shaft. Located above the support assembly and attached to the vertical member is a reciprocation arm having a cam guide attached to its outer end. A cam assembly including an eccentrically offset cam bearing is disposed within the cam guide. The cam assembly is operatively connected to a source of rotary power which when energized reciprocates the support member in a selective oscillating cycle.
Abstract: The drive mechanism for a paper tape punch and reader assembly utilizes tape drive assemblies which move the paper tape in response to the application of continuous periodic motion and control signals. The periodic motion serves to oscillate a rocker plate between first and second limits and the control signls serve to selectively engage and disengage a detent which effects coupling between the drive shaft and the source of periodic motion. The periodic motion is imparted to the drive assembly by a connecting link which in turn is driven by an adjustable eccentric.The eccentric comprises a pulley plate which is fixed to a shaft. A circular body is adjustably movable with respect to the pulley plate and is arranged to engage the race of a ball bearing assembly which further comprises balls and a retaining ring. The connecting link has a circular opening which provides a snug fit to the exterior of the retaining ring.
Abstract: The invention achieves a method and a device for providing infinitely variable adjustment to the throw of an eccentric from zero to a maximum while the eccentric is permitted to continuously travel in angular motion. This is achieved by two juxtaposed and eccentric members mounted on a drive shaft, one (the outer) overriding, the other (the inner). The eccentric members may be relatively positioned by a control shaft, which extends coaxially through the drive shaft, and gearingly mates with the outer eccentric member. The outer surface of the outer eccentric can be arranged (by relatively positioning the outer and inner eccentric members) to trace the loci of points of a circle, whereupon no reciprocation takes place, or of a family of ellipses of varying eccentricity, whereby reciprocation is achieved in correspondence to the relative eccentricity in the path of travel of the outer surface.
Abstract: A drive mechanism for a shaker conveyor is disclosed in which a drive unit is supported on a mounting beam and has an output crank connected through a pull rod to a conveyor trough such that the puller rod undergoes movement in a plane substantially parallel to the direction of movement of the trough. The drive unit is rotatable relative to the mounting beam in a manner to selectively vary the acceleration characteristics of the conveyor trough, and has a self-contained internal lubricating system which provides improved quiet operation.