Showing papers on "Drive wheel published in 1990"

Powdered maneuverable hospital cart

Abstract: A powdered maneuverable cart with a cart frame including a top load bearing portion and a bottom portion interconnected having hydraulic cylinders for raising the top portion in relation to the bottom portion. Situated above the cart frame top portion is a generally horizontal load bearing portion having head and feet ends with means included for allowing the head and feet ends to be raised and lowered independently in relation to the cart frame top portion. The cart frame bottom portion includes four swivel wheels mounted at each of the four corners of the bottom portion for allowing rolling and turning movements of the cart. Situated between the four swivel wheels, and generally in the central area of the cart frame bottom portion, is a drive wheel carriage having two opposing drive wheels. The rotational rate and direction of each drive wheel may be controlled independently for steering the cart. In order that the cart may be moved about manually, and in short side to side movements, the drive wheel carriage includes means for raising and lowering the carriage so as to engage or disengage the drive wheels from the floor surface. The drive wheel carriage may be interconnected to the underside of the cart bottom portion by a turntable allowing the carriage to be rotated about is vertical center on the turntable.

Power-assisted wheelchair

Abstract: A power-assisted wheelchair is disclosed that is particularly well suited for use by a person capable of exerting some hand/arm force in attempting to propel the wheelchair while seated therein, but incapable of exerting sufficient force, at least in some instances, to achieve satisfactory overall non-assisted operation of the wheelchair. Power-assist is provided by an electrical power unit that includes a motor for driving each main wheel of the wheelchair, with the power unit being removable to facilitate folding of the wheel chair when not in use. Motor energization is initiated when the user exerts force on the hand rims, connected with the drive wheels, in an attempt to propel the wheelchair. Displacement of the handrim relative to the associated drive wheel caused by the user exerted force is sensed and an electrical signal is produced to cause motor energization, with structure and feedback circuitry also being included for enhancing the efficiency of the power assist thus provided.

Dual hydrostatic drive walk-behind mower

Abstract: An extra-wide self-propelled lawn mower employs twin hydrostatic transmissions to power the left and right rear drive wheels that are situated behind a forward moving deck. Hydrostatic drives have infinitely variable adjustment speed from reverse through neutral, to a maximum forward speed. There are also independent left and right control levers mounted adjacent the hand grips that are coupled through linkages to control levers for the respective hydrostatic transmissions. An engine has its center of gravity situated behind the drive wheel axles to balance the weight of the moving deck. Spring returns associated respectively with the two hydrostatic transmissions return the same to the neutral position when an operator releases the respective control levers.

Track laying work vehicle

Abstract: A track laying work vehicle (10) has an undercarriage assembly (16) including a rigid support beam (46) and first and second roller frame assemblies (36, 38), one on either side of the vehicle (10). Each roller frame assembly (36, 38) has first and second end portions (52, 54, 56, 58) and supports a rotatable idler wheel assembly (40, 42) at the first end portion (52, 56) and a powered drive wheel (26, 28) at the second end portion (54, 58). Each drive wheel (26, 28) is frictionally engaged with a drive axle (22, 24) of the vehicle (10) and can be engaged with a drive axle (22, 24) at a plurality of lateral positions on the axle (22, 24). The first end portion (52, 56) of each roller frame assembly (36, 38) is releasably connected to one end (84, 86) of the support beam (46) and is laterally moveable on the support beam (46). An endless track (48, 50), such as an elastomeric belt (60, 62), encircles a respective drive wheel (26, 28), roller frame assembly (36, 38), and idler wheel assembly (40, 42) on each side of the vehicle (10). By moving the track roller frame assembly (36, 38) and drive wheel (26, 28) laterally along the drive axle (22, 24) and support beam (46) respectively, various gage settings of the endless track (48, 50) are provided.

Independent-drive wheel for a wheel-mounted vehicle

Abstract: An independent-drive wheel for electric cars, bicycles, and wheelchairs wherein electromagnets 14,15 of rotor 12 of a commutator motor are positioned along a circumference in the form of a pair of groups which are offset with respect to each other, and wherein distribution commutator 6 of stator 9 electrically connected to electric energy storage device 32 is constructed in such a manner that when magnetic axes 17,18 of electromagnets of one group and magnetic members 11 of the stator are aligned, electromagnets 14 are connected to electric energy storage device 32, and when magnetic axes 19,18 of electromagnets 15 of the second group and of respective magnetic members 11 of stator 9 are not aligned, these electromagnets 15 are connected to voltage control unit 36.

Positively driven elastomeric tracked work vehicle

Abstract: A track assembly for a track laying vehicle comprising a vehicle body (3) and two track assemblies each track assembly comprising first and second wheels (5, 32) one being a drive wheel (5), and a continuous elastomeric track (9) with power transmission elements (11) projecting therefrom. The drive wheel comprises a hub (67) and rim supports (8) operatively connected thereto, circumferential side rim sections (65) operatively connected to the rim supports (8) with a gap therebetween, drive members (7) extending between the rim sections (65) so as to separate the gap into spaced upper zones each being adapted to receive therein one of the power transmission elements (11) the upper zones communicating with open side zones between the rim supports. The track (9) has a unique arrangement of reinforcing filaments (55) and mounting members (57) for additional filaments (58). There is also a suspension assembly with a unique arrangement of its axles (72, 73).

Variable speed lever propelled wheelchair

Abstract: Disclosed is a wheelchair having a pair of levers along its opposite sides connected with sprockets on drive wheels. In one form, each lever is connected to its sprocket by a rack. The drive wheels have a clutch enabling the power stroke of the lever to drive the wheels through the rack-and-pinion engagement, yet permitting the sprocket to rotate in the reverse direction freely upon the return stroke of the lever. The rack includes an arcuate extent void of teeth to enable disengagement of the drive connection between the lever and sprocket whereby the wheels may move freely in either direction. In another form, a chain interconnects the lever and a return spring connected to the wheelchair frame. The chain has an extent void of pins to enable disengagement of the drive connection between the lever and sprocket, whereby the sprocket and, hence, drive wheel are free to rotate in either direction. A speed change mechanism is employed to vary the torque applied to the sprocket by the lever.

Drive wheel slip control system for vehicle

Abstract: Drive wheel slip control system for a vehicle includes means for setting a reference value for slippage of a drive wheel providing an appropriate slip condition, means for reducing the drive wheel torque when the slippage exceeds the reference value, means for detecting the opening degree of an accelerator of a prime mover which drives the drive wheel, and means for correcting the reference value dependent on signals from the detecting means. The vehicle responds to accelerator operation even during control of the drive wheel slip, enabling a sporty travel.

Traction control system

Abstract: A traction control system controls the engine torque so as to prevent wheel slip during acceleration. The system has an electric control unit ECU which detects the state of wheel slip on the basis of the deviation of the drive wheel speed from a target drive wheel speed computed in accordance with signals from various sensors such as drive wheel speed sensors, trailing wheel speed sensors, shift position sensor for sensing the shift position in an electronic control transmission ECT, engine speed sensor and accelerator sensor for sensing the amount of operation of accelerator. The ECU computes, in accordance with the state of the slip, a limit drive torque which does not allow surplus wheel slip during acceleration. The ECU also updates the limit drive torque depending on whether the surplus slip takes place on drive wheels, and detects also the amount of operation of the accelerator so as to inhibit updating of the limit drive torque when the detected amount of operation of accelerator is below a value corresponding to a limit throttle opening, whereby the engine is controlled such that the drive torque applied to the drive wheels is maintained below the limit drive torque.

Power unit for driving manually-operated wheelchair

Abstract: This invention relates to a power drive unit which is attachable to, and detachable from, a conventional wheelchair. Thus, a conventional manually-powered wheelchair can be converted into a power driven wheelchair employing the subject apparatus for driving and directing the movement of a manually-driven wheelchair having a plurality of wheels riding on an underlying surface. The subject apparatus comprises a drive and steering wheel which rides on the underlying surface for driving and for directing the path of operation of the wheelchair, as well as for powering the drive wheel. The apparatus is attachable to, and detachable from the wheelchair and is located rearwardly of the wheelchair so that the weight on the drive and steering wheel will substantially only be the weight of the apparatus. On the other hand, the weight of a person sitting in the wheelchair will be substantially the only weight imparted to the wheelchair wheels. The power steering and driving operations are continuously conducted using the drive wheels, without regard to substantial direct downward forces imparted to the drive wheels by the wheelchair user. The unit preferably comprises a single rear-wheel drive motor and wheel unit.

Device for adjusting the relative angle of rotation of a shaft to a drive wheel, especially the camshaft of an internal combustion engine

Abstract: Dans un dispositif de reglage relatif de l'angle de rotation d'un arbre par rapport a une roue motrice, notamment de l'arbre a cames d'un moteur a combustion interne, comprenant un moteur lineaire hydraulique comme moyen de commande d'un mecanisme de reglage entre une roue motrice et un arbre, il est propose, en vue d'obtenir une unite compacte, non encombrante, destinee a etre montee pour s'integrer a/ou sur un moteur a combustion interne, qu'une pompe hydraulique comportant un rotor soit disposee coaxialement par rapport a l'axe longitudinal ou de reglage du moteur lineaire. In a related device for adjusting the rotation angle of a shaft relative to a drive wheel, especially the camshaft of an internal combustion engine, comprising a hydraulic linear motor as a control means adjusting mechanism between a driving wheel and a shaft, it is proposed, in order to obtain a compact, non-bulky, intended to be mounted to fit into / or an internal combustion engine, a hydraulic pump comprising a rotor is coaxially disposed with respect to the longitudinal axis or regulating the linear motor. De preference, le rotor est monte mobile en rotation sur la peripherie exterieure d'un cylindre du moteur lineaire realise sous la forme d'un bloc cylindre/piston. Preferably, the rotor is rotatably mounted on the outer periphery of a cylinder of the linear motor constructed as a cylinder block / piston.

Tire traction enhancing kit

Abstract: An apparatus for enhancing traction for two drive wheels of a self-propelled vehicle, wherein the kit includes a reservoir coupled to a primary conduit through selective actuation of a solenoid valve. The primary conduit is in fluid communication with a secondary conduit, wherein the secondary conduit includes a spray head positioned adjacent each drive wheel of the vehicle. The spray head includes an apertured semi-spherical spray head to disperse fluid to and adjacent the drive wheels to effect melting of snow and ice thereabout. The kit further includes a dispersion brush selectively securable about the nozzle to minimize dirt and debris intrusion into the spray head, and further includes elastomeric cap member to overlie the spray head and enclose the same during periods of non-use.

Reverse drive for vehicle

Abstract: Apparatus is described for use in a vehicle having a forward motion transmission operatively connected between an engine and the output shaft connecting the drive wheel and a reverse drive mechanism arranged to be operatively connected to the output shaft for driving the vehicle in reverse. A speed change shift device is arranged to operate the forward motion transmission and the reverse drive mechanism so as to prevent simultaneous operation of the two apparatus.

Self-propelled vehicle

Abstract: A self-propelled vehicle includes a frame having a pair of foot treadles mounted in side-by-side relation and depressible with respect to the frame; an overrunning clutch for each of the foot treadles and having a drive member coupled to its respective foot treadle and a driven member coupled to the drive wheel; and a planetary gear assembly for each of the overrunning clutches for coupling the drive member to the respective foot treadle such as to multiply, by a factor of at least two, the displacement of the clutch driven member by its respective foot treadle.

Power transmission and steering apparatus for vehicles

Abstract: A power transmission and steering apparatus for vehicles includes an engine coupled for rotating a pair of coaxial, spaced-apart driver wheels formed of a low durometer plastic material. A pair of discs are positioned in an opposed, spaced apart relation and adjacent to the peripheries of the driver wheels and one being on each of the opposite sides thereof. The discs are each coupled to a different one of the vehicle drive wheels, and each disc is mounted for rotation on a pivotable shaft. Independent control levers are coupled to each disc for independently tilting the same into engagement with a selected one of the driver wheels for rotation in one direction upon engagement with a first drive wheel and for rotation in the opposite direction upon engagement with the other driver wheel, the speed of rotation being controlled by the pressure between the disc and the driver wheel.

Motor vehicle transmission system

Abstract: A motor vehicle transmission system, for use on a motorcycle, for example, includes a sensor for detecting a direction in which a shift pedal is operated for an upshift or a downshift, a torque direction sensor for detecting a direction in which the torque is transmitted between an engine and a drive wheel, and an engine output power control assembly responsive to output signals from the sensors for temporarily increasing or reducing the output power of the engine, so that a transmission mechanism can be shifted without disengagement of a clutch.

Lift truck with a drive unit pre-tensioned by spring loading in the vertical direction

Abstract: In a lift truck, preferably a shaft-steered traveling lift truck with a drive unit (3) pre-tensioned by spring loading in the vertical direction, the drive unit is hinged, adjustably in height, by linkage parallelogram suspension (41, 42, 44) on a chassis part (1) of the lift truck which cannot be raised. To continuously adjust the drive wheel pressure to the useful load conditions, at least one lifting cylinder (45) of the working hydraulic system for the low lift (basic lift is arranged directly between a chassis part (49) that can be raised and the linkage parallelogram suspension (41, 42, 44), and its lower end is mounted in a horizontal transverse linkage (42). The support force of the lifting cylinder (45), which opposes the lifting force, is broken down according to a leverage ratio of lever (47) to lever (48) one force component is absorbed by the chassis part (1) that cannot be raised, and the other force component is transmitted directly to a drive wheel 5 of the drive unit 3 via a lever arm (47) in order to thus maintain the necessary driving and braking torque. In order for the drive unit (3) to be able to compensate for unevennesses of the ground even when the lift truck has been lowered, a lifting piston (50) of the lifting cylinder (45) has a free running segment (52) designed as residual stroke.

Drive system for an industrial vehicle, in particular for a pedestrian controlled forklift

Abstract: A drive system for an industrial vehicle which consists substantially of an electric motor, a two-step transmission and a drive wheel and can be pivotally mounted for movement about a vertical axis in the undercarriage of the industrial vehicle An axis of the electric motor is arranged parallel with respect to the drive wheel The transmission can be a two-step spur gearing or a combined toothed belt and spur gearing A swivel bearing is arranged above the drive wheel, the external race of which swivel bearing is received in the gear housing and the internal race of which swivel bearing is mounted onto a swivel pin extending downwardly from the undercarriage, the axis of said swivel pin lying at least approximately in the center rotational plane of the drive wheel, with the electric motor projecting above the area of the undercarriage having the swivel pin A blocking brake is housed in the drive system, either as a spring-storage brake, which is integrated into the driven gear or rather the second toothed pulley of the first transmission step

Pedal drive mechanism

Abstract: A drive mechanism and a bicycle having a drive mechanism is disclosed, the drive mechanism increasing the torque resulting from a force applied to the pedals and providing for more efficient transmission of such force to propel the bicycle or other vehicles or device. The drive mechanism includes a drive sprocket rotatably mounted to the bicycle frame, a pair of opposing pedal cranks, a pair of lever arms, each lever arm being rotatably secured to one of the opposing cranks such that there is a distance between the point of connection and the pedal, a pair of guide members, each of which are pivotally connected to the respective lever arms remote from the respective pedals and being pivotally connected to the bicycle frame such that the guide members can limit movement of the respective lever arms, and thereby provide a more efficient path of movement for the pedals. The guide members are connected to the respective lever arms at angles thereto, and the lever arms, at the point of pivotal connection to the guide members, always remain below the axis of the drive wheel.

Vehicle, continuously variable gear mechanism, and transport system

Abstract: A vehicle comprises as its prime source of power a fly-wheel (6), this is connected to a driving wheel (D) of the vehicle in the intermediary of a continuously variable transmission mechanism (16). The transmission mechanism comprises conical drive members (53, 54, 82), with a spherical transmission element (55, 31) between the conical surfaces, to transmit rotary forces from one drive member to the other. In this way rotation energy from the fly-wheel may be transmitted to the drive wheel on acceleration of the vehicle, or transmitted from the drive wheel to the fly-wheel on retardation of the vehicle. The vehicle is for use in a transportation system in which the vehicle travels around a predetermined route, with the fly-wheel being recharged either by mechanical means or by an electric means at a vehicle terminus (L).

Enclosed single-axle driving mechanism for bicycles

Abstract: This drive structure for bike mainly uses two pairs of master-slave bevel gear set (one before another) to change the direction of power transmission, thus outputting the power from pedaling. A single adjustable relay of central shaft is used mainly to rotate the shaft of back drive wheel, so that the space possessed by drive structure is decreased and the use safety increased.

Drag reduction air channel - is shaped to accommodate gas, air or fluid medium accelerated to twice vehicle speed

Abstract: The shape of the guide channel (6) is such that it receives gas, air or fluid medium (8) accelerated to twice the vehicle travel speed (8), diverts it through approx. 130-180 deg., and feeds it away in the opposite direction to that of vehicle travel. At a specific point on the vehicle wheel (3), the total medium flow (5) at double the vehicle travel speed is introduced and centrifuged at the medium reversing point (8) in the guide channel (6). The guide channel can have a quadratic, rectangular, oval or round cross-section, and can incorporate a cooler, ventilator or turbine. USE/ADVANTAGE - For all kinds of vehicles, to reduce or obviate gas, air or fluid eddying on a drive wheel, and thereby provide a power economy.

Combination drive-wheel mechanism and travel-sensor mechanism

Abstract: Traction apparatus for driving a vehicle and accurately sensing the distance traveled, in which a drive mechanism is encircled by a separate ring-shaped encoder wheel The encoder wheel, which is part of a travel-sensing mechanism, nests annularly with the drive mechanism so that the width of the combination is minimized The travel-sensing mechanism can be assembled to the vehicle without disturbing the drive mechanism There is enough radial clearance in the toroidal encoder wheel to permit the drive mechanism to move up and down within the encoder wheel The encoder wheel has approximately the same outside diameter as the drive wheel, so certain common-mode measurement errors cancel The encoder wheel and the drive wheel are approximately concentric and closely spaced laterally to minimize measurement errors that would otherwise occur upon turning of the vehicle The tire of the encoder wheel is much narrower than that of the driving wheel, so the encoder wheel has a more constant effective lateral location during turning of the vehicle, which increases accuracy of travel measurement An electronic encoder is offset from the encoder wheel and is belt-driven to provide a mechanical amplification that improves the measurement's resolution A belt sprocket on the encoder wheel has spaced-apart groups of teeth that engage the toothed belt

Motor-operated vehicle

Abstract: PURPOSE: To perform drive with the aid of a motor from a starting and to reduce a load on the motor during low rotation running by a method wherein a transmission mechanism interconnects the motor side and the drive wheel side only in a range of the given number of revolutions at which the maximum efficiency of the motor is provided. CONSTITUTION: When a motor 30 is started by means of a starter switch, not shown, a rotary shaft 50 is rotated. When the rotation speed of the motor is low, first and second centrifugal switches 78 and 85 are in a disengaged state, the drive force of the motor 30 is not transmitted to rear wheels 13, and a belt type continuously variable transmission 31 is in a racing state. When, from this state, an accel grip is rotated and the rotation speed of the motor 30 is increased, a centrifugal weight 73 is radially outwardly moved, the effective radius of a drive pulley 66 is increased, and the effective radius of a drive pulley 68 is decreased. This operation increases the rotation speed of a sleeve 75, and when the number of revolutions of the pulley 68 exceeds the set number of revolutions approximately equal to the number of revolutions at which the maximum efficiency of the motor is provided, the drive force of the motor 30 is transmitted to an input shaft 67 of a reduction gear. COPYRIGHT: (C)1991,JPO&Japio

Power unit for motor-driven vehicle

Abstract: PURPOSE:To simplify structure of a power unit and to reduce weight by a method wherein a motor housing containing a motor is located in integral structure to a transmission case which is pivotally supported to a car body in a manner to be capable of swinging and mounted in a spanning state to a drive wheel. CONSTITUTION:The front end of a swing type power unit P to the rear end of which a rear wheel Wr is supported in a spanning state is vertically rockably supported to the rear part of a frame by means of a pivot 5. In a motor bicycle, the power unit P is provided at a front end with a transmission case 13 through which a pivot 5 is laterally extended, and a motor M located to the front part thereof is connected to a reduction gear 14 located to the rear thereof through a belt type continuously variable transmission 15. The motor M is contained in a motor housing 16 formed integrally with the front part of the transmission case 13, and the opening of a right side is closed by a cover member 18. The motor M is provided with a rotor 33 wherein a permanent magnet 32 is disposed to the outer periphery of a core 31 secured on a rotary shaft 19 and a stator 37 formed with a coil 36 wound around a core 35.

Apparatus and method of controlling automotive wheel traction and slippage using an auxiliary throttle valve

Abstract: A system and method for controlling engine output applicable to an automotive vehicle are disclosed in which when engine output control to reduce the engine output through a second throttle valve (additionally installed in an engine intake passage in series with a first throttle valve interlocked with an accelerator element) is ended, a returning speed of the second throttle valve toward its fully open position is made slower than that carried out during the engine output reduction control so as to suppress drive wheel slippage and a target opening angle of the second throttle valve by which the second throttle valve is returned to the open position is set to an opening angle of the first throttle valve to which an offset quantity is added to improve acceleration response immediately after engine output control has been carried out.

Method and apparatus for selecting a single sheet of paper from a paper tray

Abstract: The top sheet is separated and removed from a paper sheet stack by a paper feed mechanism which is selectively movable downwardly toward the stack. As the feed mechanism downwardly approaches the stack, a foot portion of the mechanism frictionally contacts the top sheet and is upwardly pivoted by the stationary paper stack. Upward pivoting of the foot portion causes it to frictionally shift the top sheet in a first horizontal direction relative to the rest of the sheets. A drive wheel portion of the feed mechanism, supported for conjoint pivoting with the foot portion about its pivot axis, then frictionally engages the shifted top sheet in place of the foot portion. In response to the upward pivoting of the foot portion, a driven gear supported for pivotal movement therewith and rotationally locked to the drive wheel portion is caused to mesh with a drive gear operative to rotate the driven gear and thus the drive wheel portion. Rotation of the drive wheel portion frictionally drives the shifted top sheet, over a ramp-shaped portion of the feed mechanism, in a horizontal direction opposite to the initial shift direction thereof to thereby separate and remove the top sheet from the paper stack.

Traction control system for four-wheel steerable vehicle

Abstract: A traction control system for a four-wheel steerable vehicle includes a reference value generating circuit for generating a reference value for detecting a slippage of a drive wheel in a driving state, an output torque control device for controlling the torque of the drive wheel on the basis of an output from said reference value generating circuit so as to bring said drive wheel into a predetermined slipping state, and a reference value correcting circuit for correcting the reference value on the basis of a rear wheel steering angle. This makes it possible to insure a steering stability in a critical condition when a misalignment has been produced in phases of the front and rear wheels.

Hydraulic control apparatus for vehicle continuously variable transmission, having two shift control valves selectively enabled depending upon selected position of clutch device between engine and drive wheel

Abstract: A hydraulic control apparatus for controlling a vehicle continuously variable transmission (14) having a clutch device (16) disposed in series with the transmission in a power transmitting line, to disconnect the power transmitting line when a shift lever is placed in a neutral position. The apparatus includes a first shift control valve (330, 460, 490) for producing a first output for changing the speed ratio, based on a required output pressure corresponding to the currently required vehicle acceleration value, and a first input shaft speed corresponding to the transmission input shaft speed, a second shift control valve device (332) for producing a second output for changing the speed ratio, based on a second input shaft speed pressure and an output shaft speed pressure corresponding to the input and output shaft speeds of the clutch device, respectively, so as to reduce a difference between the speeds of the input and output shafts of the reversing device, and a switching valve device (328) for applying the first and second outputs to the transmission when the shift lever is operated to the drive and neutral positions, respectively.

Portable handheld power-driven tool

Abstract: This disclosure is directed to a portable handheld power-driven tool such as a cutoff machine. The cutoff machine includes an engine having a drive shaft. A drive wheel for the work tool is provided at one end of the drive shaft and a fan wheel for moving cooling air to the engine is mounted at the other end of the drive shaft. A pull rope starter is mounted at the power takeoff end of the drive shaft so that it lies outside of the flow of cooling air. In this way, abrasive dust is prevented from accumulating on the pull rope starter and its operational service life is significantly increased.