EP0396731A1 - Vehicule - Google Patents

Vehicule

Info

Publication number
EP0396731A1
EP0396731A1 EP90900231A EP90900231A EP0396731A1 EP 0396731 A1 EP0396731 A1 EP 0396731A1 EP 90900231 A EP90900231 A EP 90900231A EP 90900231 A EP90900231 A EP 90900231A EP 0396731 A1 EP0396731 A1 EP 0396731A1
Authority
EP
European Patent Office
Prior art keywords
vehicle according
axle
vehicle
fluid
oscillating
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
EP90900231A
Other languages
German (de)
English (en)
Inventor
Derek Arthur Bladen House Lodge Hill Prime
Jeremy Richard Thake
Derek William Foster
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
JC Bamford Excavators Ltd
Original Assignee
JC Bamford Excavators Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from GB888826883A external-priority patent/GB8826883D0/en
Priority claimed from GB898916261A external-priority patent/GB8916261D0/en
Application filed by JC Bamford Excavators Ltd filed Critical JC Bamford Excavators Ltd
Publication of EP0396731A1 publication Critical patent/EP0396731A1/fr
Ceased legal-status Critical Current

Links

Classifications

    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/08—Superstructures; Supports for superstructures
    • E02F9/0841—Articulated frame, i.e. having at least one pivot point between two travelling gear units
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/20—Drives; Control devices
    • E02F9/22—Hydraulic or pneumatic drives
    • E02F9/2257—Vehicle levelling or suspension systems
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2200/00—Indexing codes relating to suspension types
    • B60G2200/30—Rigid axle suspensions
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2200/00—Indexing codes relating to suspension types
    • B60G2200/30—Rigid axle suspensions
    • B60G2200/32—Rigid axle suspensions pivoted
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2204/00—Indexing codes related to suspensions per se or to auxiliary parts
    • B60G2204/40—Auxiliary suspension parts; Adjustment of suspensions
    • B60G2204/46—Means for locking the suspension
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2300/00—Indexing codes relating to the type of vehicle
    • B60G2300/08—Agricultural vehicles
    • B60G2300/082—Tractors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2300/00—Indexing codes relating to the type of vehicle
    • B60G2300/09—Construction vehicles, e.g. graders, excavators

Definitions

  • This invention relates to a vehicle having a first pair of ground engageable means carried on a first oscillating member which is pivotable about a generally horizontal axis e.g. horizontal or inclined to the horizontal up to about 15 relative to a second oscillating member which carries a second pair of ground engageable means.
  • the generally horizontal axis permits the pairs of wheels to twist relative to each other when driving over uneven ground so that the pairs of ground engageable means can conform to the shape of the ground.
  • Such vehicles which have at least one of the first and second osculating members provided by an "oscillating axle", That is, an axle which is connected to a respective chassis part by means of a connection which permits the axle to oscillate relative to the chassis part about a generally horizontal axis e.g. horizontal or inclined to the horizontal up to about 15 to enable the vehicle to travel over rough terrain, the chassis part being rigid with a further chassis part about a generally horizontal axis.
  • the chassis parts themselves may be connected for pivotal movement about a generally horizontal axis with the wheels being carried bv the respective chassis parts without provision for pivotal movement about a generally horizontal axis.
  • the invention relates to a vehicle comprising a front chassis part and a rear chassis part which are articulated for steering about a generally upright axis e.g. vertical or inclined to the vertical up to about 10o .
  • a vehicle will hereinafter be referred to as "an articulated vehicle”.
  • An object of the invention is to provide ⁇ new and improved vehicle.
  • a vehicle comprising a first pair of ground engageable means carried on a first oscillating member which is pivotable about a generally horizontal axis relative to a second oscillating member which carries a second pair of ground engageable means and a stabilising system
  • the stabilising system comprising fluid operated actuator means, connected hetween the oscillating members to control oscillation therebetween about said generally horizontal axis, passage means to enable fluid to flow to and from a chamber of the actuator means in response to oscillation of the members and valve means to control the flow of fluid along the passage means in a direction to control oscillation between said members, said valve means being actuated by a control signal dependent on a ground engaging force transmitted by a ground engageable means of the vehicle.
  • Flow of fluid through the passage means from a chamber of the actuator means, which is operative to control rising of one of the first pair of ground engageable means carried by the first oscillating member, is controlled by a valve means provided with a control signal derived from said force transmitted by one of the second pair of ground engageable means which is diagonally opposite, as herein defined to said one of said first pair of ground engageable means.
  • 'diagonally opposite' we mean a ground engageable means which is disposed on the opposite side of a fore and aft line of the vehicle and which is disposed towards the opposite .end of the vehicle to the end adiacent which is disposed said ground engageable means which is tending to rise.
  • the valve means may prevent transfer of fluid relative to the actuator chamber to control said oscillation.
  • valve means may permit transfer of fluid relative to the actuator chamber against a resistence to fluid flow to control said oscillation.
  • the invention is particularly, but not exclusively, for use where the vehicle is an articulated vehicle as herein defined.
  • the flow of fluid is controlled so as at least to resist relative pivotal movement between the oscillating members to counteract rising of one oscillating member relative to the other on the same side as the direction in which the one oscillating member has been articulated for steerina.
  • the oscillating members may comprise, in a preferred embodiment, an oscillating axle and an associated chassis part but may comprise two oscillating chassis parts.
  • the oscillating axle may be provided either on a front or rear chassis part, or both the front and rear axles may be oscillating axles, in which case both the front and rear axles may have a stabilising system if required.
  • load we mean the effect of the load on the stability of the vehicle.
  • the vehicle may have a boom carrying a loading implement such as forks or a bucket, which boom and loading implement may be operated by a power system, such as a fluid operated system, to enable the loading implement to be loaded.
  • a power system such as a fluid operated system
  • the invention may be applied to any other type of vehicle which h ⁇ s an oscillating member.
  • a single acting fluid operated actuator may be provided on each side of the axis of oscillation of the members, a passage means connecting each actuator chamber to a source of fluid under pressure and the valve means controlling flow of fluid along the passage means.
  • a double acting fluid operated actuator may be provided on one or each side of the axis of oscillation of the members, the passage means connecting the chambers on opposite sides of the or each actuator to a source of fluid under pressure and the valve means controlling flow of fluid along the passage means.
  • the passage means may connect the actuator chambers together so that fluid ejected from one chamber is transferred towards the other and vice-versa.
  • Means may be provided to supply fluid to an actuator to force the associated side of an oscillating member carrying a ground engageable means downwardly.
  • the fluid may be supplied from a hydraulic circuit which supplies hydraulic fluid to a loader operating means of the vehicle.
  • Said control signal may be provided by a sensing means adapted to sense a parameter which varies in dependence on variation in said ground engaging force.
  • Said sensing means may provide an electrical control signal.
  • Said sensing means may provide a fiuid control signal.
  • Said sensing means may be operable to sense deflection of a part of an element of a rear axle of the vehicle having said ground engageable means mounted thereon.
  • Said sensing means mav be operable to sense movement of a part carried by an element of the rear axle of the vehicle having said ground engageable means mounted thereon.
  • Said sensing means may be operable to sense strain of a chassis part on which is mounted a part of a rear axle of the vehicle having said ground engageabie means mounted thereon.
  • Said element may comprise a casing of the axle.
  • Said deflection mav be sensed by sensing the distance between a part of said element of the axle and a reference member connected in cantilever to another part of the axle or to the chassis part.
  • the reference member may be disposed within the ax'e casing.
  • the reference member may be fixed to the axle ad'acent the mid-point thereof and the reference member may extend in cantilever and parallel to the axis of rotation of the ground engageable means carried by the axle.
  • the distance may be measured by measuring the movement of a probe which is movably carried bv a mounting member fixed to the axle and the probe being movable with the reference member.
  • Means may he provided to ensure that the axle and reference member are uniformly heated to avoid significant variation in said distance sensing due to differential thermal expansion.
  • Means may be provided to distribute oil within the axle over the whole or substantially the whole of the internal surface thereof and of the reference member so that, in use, the temperature of the axle and reference member is uniform or substantially uniform.
  • the reference member may be tubular, one end of the tube being fixed to the axle and the distance between the axle and a portion adjacent the other end of the tube being sensed.
  • the tubular reference member may be provided with openings at least in an upper part thereof to enable oil to pass therethrough.
  • the tubular reference member may encircle a drive shaft to the ground engageable means and the shaft may drive an oil distributing means to dis tribute oil onto an upper part of the inner surface of the tube and, through said openings, onto the axle casing.
  • the sensing means may comprise a fluid operated ram, connected so as to be driven by relative movement between a part of the rear axle having said ground engageable means mounted thereon and a chassis part, displacement of fluid relative to said ram providing said control signal to the valve means.
  • FIGURE I is an illustrative side view of a vehicle which embodies the invention.
  • FIGURE 2 is a view looking forwards at the rear of the front axle of the vehicle of Figure I showing part of a stabiliser system according to the invention
  • FIGURE 3 is a diagrammatic illustration of the hydraulic circuit of the stabilising system of the vehicle of Figures 1 and 2,
  • FIGURE 4 is a diagrammatic illustration of the electric circuit of the stabilising system of Figure 3 showing the vehicle in plan view
  • FIGURE 5 is a diagrammatic illustration of an alternative hydraulic circuit
  • F1GUP.E 6 is a fragmentary cross-sectional view through part of the rear axle of the vehicle of Figure 1 .
  • FIGURE 7 is a fragmentary view showing a modification of the vehicle shown in Figure 1 .
  • a vehicle 10 of the articulated type has a vehicle body 1 1 comprising a front chassis part 1 2 and a rear chassis part 1 3, and a pair of loading arms 14 which together comprise a loading boom, carried on the front chassis part 12.
  • the vehicle 10 is driven and the loading arms 14 are controlled, from within an operator's cab 15 which is mounted on the rear chassis part.
  • the body 1 1 carries two pairs of ground engageable means comprising wheels 17, 18.
  • the wheels 17 are termed hereinafter “the front wheels” and are carried on a front axle 30 on the front chassis part 12.
  • the wheels 1 8 are termed hereinafter “the rear wheels” and are mounted on a rear axle 200 carried by the rear chassis part 13
  • the loading arms 14 are pivotally mounted at one end at 20 to the front chassis part 12, and carry at an opposite end a loading implement comprising in this example, a loading bucket 22.
  • the loading arms 14 can be moved about a pivot 20 by a pair of hydraulic actuators 23 connected in a loader lift arm circuit, although only one of these can be seen In Figure 1 of the drawings.
  • the bucket 22 can be pivoted relative to the loading arm 14 for movement about a generally horizontal axis 25, by a further pair of hydraulic actuators 26 (only one of which can be seen) mounted between the loading arms 14 and the bucket 22.
  • the vehicle 10 can be loaded and unloaded by manipulating the arms 14 and bucket 22, as is well known In the art. If desired, any other means for manipulating the arms and the bucket mav be provided.
  • the vehicle 10 can be steered by articulating the front chassis part 12 relative to the rear chassis part 13, about a generally vertical axis 27, by means of linear hydraulic actuators which are provided to effect this articulation, although alternatively any other hydraulically powered or other slewing means could be provided.
  • FIG. 2 there is shown the front axle 30, which in use carries the front wheels 17, although the wheels 17 themselves are omitted from Figure 2.
  • the wheels 17 are mounted on hubs 31 at each end of the axle 30 and the hubs 31 are driven via half shafts within the axle 30 from a crown wheel and pinion gear mounted in a housing 32 of the axle, drive being transmitted thereto from a gearbox G via drive shafts H.
  • the axle 30 is of the oscillating type and is mounted relative to the front chassis part 12 by trunnions 34 received by bushed openings of the chassis front part 12 so that the axle 30 may oscillate about a generally horizontal pivotal axis 35.
  • This oscillation permits of overturning of the vehicle in certain circumstances.
  • the loading bucket 22 is transporting a load and the chassis parts have been articulated about the axis 27 for steering, the reaction with the ground preventing overturning occurs at the contacting point of the inside rear wheel 18 and the pivot axis 35 at the centre of the axle 30.
  • the load being offset, in the direction of steering, from a projection of a line joining these points, creates a turning moment.
  • an actuator means comprising a pair of single acting hydraulic actuators 138, 139, is mounted between the axle 30 and the front chassis part 12 externally of the chassis side plates 12g of the first chassis part 1 2.
  • One actuator 1 38 is provided to one side of the axis 35 and the other actuator 1 39 is provided on the other side of the axis 35.
  • the connections between the actuators 138, 1 39 and the axle 30 and between the actuators 138, 139 and the front chassis part 12, permit of pivoting movement about the axis 35 as the axle 30 oscillates.
  • actuators 138 1 39 are each part of an axle stabilising system 140 of the vehicle 10.
  • the actuators 138, 139 have a piston 1 38g, I 39g, slidoble in a cylinder 1 38b, 139b to provide a variable volume chamber 1 38c, 1 39c.
  • T he chambers 138c, 139c are inter-connected by a passage means 141 and fluid to the stabilising system is provided from a make-up line 150 through which hydraulic fluid is fed to the passage means 141 from a hydraulic pump P provided on the vehicle which also provides fluid under pressure to the other services S of the vehicle, such as the loader arms
  • the pressure in the line 1 50 is reduced to a low pressure e.g. 14 Bar by a pressure reducing valve 152 and limited to a slightly higher pressure, e.g. 17 Bar by a pressure release valve 1 53.
  • the free flow of fluid along the passage means 141 , to transfer fluid relative to the respective actuator chamber, is control led by a respective valve 142, 143, one of which is associated with each of the actuators 138. 139.
  • the valve 142 is provided on the chassis adjacent to the actuators 1 38, 129 but may be incorporated as an integral part of the actuators if desired.
  • the valves 142, 143 are of a known type which can be opened, to permit of free passage of fluid therethrough, or closed, to prevent of passage of fluid therethrough, in a direction away from the associated actuator, by means of an electrical control signal supplied to the valve.
  • the valves are provided with a suitable check valve arrangement which allows fluid to flow through the valve 142. 143 towards the associated actuator at all times.
  • check valves 142', 143' are provided to prevent excess pressure being developed in the actuators 138, 139.
  • the passage means 141 is also provided with a restrictor and check valve assemblies 144, 145 associated with each actuator 1 38, 1 39 respectively, to permit of restricted flow of fluid away from the associated actuator and free flow of fluid in the direction towards the associated actuator.
  • the electrical control signal is provided by a suitable electrical circuit which includes sensors 170, 171 which sense the load on each rear wheel 18g, 18b as hereinafter to be described.
  • the electrical control circuit includes a controller 176 comprising a micro-processor and is arranged
  • valve 142 to close the valve 142 when the sensor 170 associated with a diagonally opposite rear wheel 18a senses that the load on the rear wheel 18g has fallen below a predetermined level whilst the valve 143 is signalled to remain open by the sensor 171 associated with a diagonally opposite rear wheel 18b, senses that the load on the rear wheel 18b is above a predetermined level, or
  • valve 143 to close the valve 143 when the sensor 171 senses that the load on the diagonally opposite rear wheel 18b has fallen below a predetermined level whilst the valve 142 is signalled to remain open by the sensor 170 associated with the diagonally opposite wheel 18g , sensing that the load on the wheel 18g is above a predetermined level.
  • the load which causes a previously closed valve to open is a higher load than that which caused the valve to be closed.
  • the higher load to cause opening of a previously closed valve avoids operation of the stabilising system when the vehicle encounters a temporary unstable condition, for example if a rear wheel encounters a pothole or other localised surface irregularity.
  • the switches which are used to provide the sensing means to controller 176 may comprise a set of relays instead of a micro-processor.
  • the front axle 30 will oscillate and fluid will be expelled from an actuator 138 or 139, as the associated axle side rises, and be fed to the other actuator 139 or 138 respectively, with the flow being restricted by the associated restrictor and check valve assembly 144, 145 respectively, to limit the speed of oscillation of the axle 30.
  • the outside rear wheel tends to become unloaded and can, in the absence of the present invention, lift from the ground.
  • the relevant sensor 170, 1 7 1 to provide a signal to the diagonally opposite control valve 1 42, 143 respectively to cause that valve to be closed and hence prevent flow of fluid from the associated actuator 138, 1 39 and therefore prevent the associated axle side rising, thus preventing the load on the diagonally opposite rear wheel falling further and hence preventing the rear wheel from lifting from the ground.
  • the check valve permits fluid to flow to the ram if the axle assembly oscillates in the reverse direction to cause the actuator to be extended.
  • the electrical circuit provides a signal to the valves, 142 or 143 to close the relevant valve to prevent the fluid flow therethrough and to open a further valve 142a or 143a to supply fluid under pressure, from the loader lift arm hydraulic circuit C, in which the actuators 23 are connected, to the associated ram 138, 139. Consequently, the associated side of the axle is forced downwardly and thus actively maintains the diagonally opposite rear wheel on the ground.
  • the restoring force of the oscillating axle 30 relative to the front chassis part 12 will change depending upon the magnitude of the load carried by the loader arm.
  • the greater the load the more pressure is provided via the valves 142a, 143a and so the greater the restoring force which is applied to the oscillating axle 30.
  • the electric circuit is preferably arranged so that the valves 142, 143 (and 142g, 143g when provided) occupy the positions illustrated In Figures 4 and 5 when no electric current is supplied thereto, thereby blocking flow of fluid from the rams, should the electrical supply fail. Hence the arrangement is "fail-safe".
  • the electrical circuit may provide a signal to the valves 142, 143 and the valves may be arranged to permit fluid flow between the actuators 138, 139, but against a resistence sufficient to stabilise the vehicle as described hereinbefore.
  • the pump P supplying fluid under pressure by the pipe 150 may be an independent pump provided for the purposes of the stabilising system and independent of the fluid circuit for the loader arms 14 or the fluid in the pipe 150 may be supplied from the loader arm circuit.
  • the actuator means may comprise a double acting actuator which may be provided on one or each side of the axis
  • the passage means connects the chambers on opposite sides of the piston of the or each double acting actuator so that the stabilising system operates substantially as described above, but with suitable arrangements provided to compensate for the different volumes of the two chambers due to the presence of a piston rod In one chamber.
  • a valve means may be associated with a chamber provided at each side of the piston of the or each double acting actuator rather than with each of a pair of single acting actuators.
  • each rear wheel 18a, 18b comprises a specially adapted rear axle 200 comprising a central housing part 201 which houses a conventional differential drive 202 and crown wheel and pinion.
  • a pair of generally tubular casings 203 are bolted to opposite sides of the housing 201.
  • each casing 203 has at its outer end an inner race 204 of a roller bearing 205, an outer race 206 of which mounts a hub 207 and a wheel 18g, or 18b is mounted on the hub 207.
  • the hub 207 is driven by a half shaft 208 which extends within the casing 200 parallel to a central axis X-X thereof and is adapted, at its inner end, to be driven by the differential 202.
  • the half shaft 208 has a sleeve 209 fixed thereto which is engaged with a multi-plate brake 210 disposed within an inner part 21 1 of the casing 703.
  • a tubular reference member 212 which is fixed to a flange 21 3 mounted within the casing 203.
  • the tubular reference member 21 2 is mounted in cantilever on the flange 2 1 3.
  • a distance sensing device 214 is bolted to a part 220 of the casing 203 and has a probe 21 5 which engages a surface part 216 of the tube 212 adiacent a free end 21 7 thereof.
  • the measuring device 2 14 comprising a voltage splitting potentiometer, the movable contact of which is moved in accordance with the position of the probe 2 15.
  • any other form of sensing device may be provided, such as a variable inductance or capacitance device, a strain gauge or an optical sensing device.
  • the tube 212 is provided with three rows of circular apertures 218, the central row being disposed at the top of the tube 21 2 and the other two rows being disposed as shown in the upper half of the tube.
  • the tube is also provide with two further circular apertures 219 at the bottom adjacent the inner end of the tube.
  • the casing 203 is partially fi lled with oil and, in use, the oil heats up and consequently the part of the casing 203 and the tube 212 immersed in the oil would be of a higher temperature to the parts of the casing 203 and tube 21 2 not immersed in the oil. Due to difrerential thermal expansion effects, the accuracy of the load measurement wi ll be affected since the distance between the two parts 220 and 21 6 would varv due to thermal differential effects, irrespective of variation in load.
  • the apertures 21 8 are provided, together with a paddle device 221 fixed to rotate with the half shaft 208 and which serves to throw oil into contact with the upper part of the tube 21 2 and, through the apertures 2 18 into contact with the upper surface of the casing 203, thus causing the temperature of the tube 212 and casing 203 to be substantially uniform throughout their circumferential extent, thereby avoiding the above mentioned differential thermal expansion effects It has been found that when the vehicle is stationary, so that the oil falls to the bottom part of the casing 218 and the paddle 221 is inoperative, the upper parts of the casing 203 and of tube 212 cool similarly so that on cooling there is no unacceptable variation In the spacing between the parts 216 and 220 .
  • the reference member 212 is cut away completely in an upper part, for example, above the central axis of the tube, so that the maiority of the tube, except for cylindrical parts, is, for example, of semi-cyl ⁇ ndrical shape, then whilst the paddle 212 serves to keep the axle casing 203 at a uniform temperature in service and the reference member 212 is maintained at the same temperature, since the majority of it is immersed in the oil in the lower part of the casing 203 so that differential thermal expansion effects are not a problem during normal use of the vehicle, when the vehicle was stationary then the reference member 212 stayed at the same temperature as the oil whilst the upper part of the casing 203, which is not immersed in the oil cooled causing differential thermal expansion effects to occur, leading to a variation in the distance between the parts 220 and 216.
  • the apertures 219 are provided to enable oil to pass between the casing 203 and the interior of the tube 212 to enable oil to be circulated through the brake 210.
  • the reference member 212 may be provided with apertures throughout its circumference and indeed may comprise a generally perforated member.
  • the reference member 212 may be of other configuration, for example it may comprise a latticework construction, or it may comprise a plurality of parallel members, for example, three members arranged in a equilateral triangle or other configuration with appropriate connecting members, or may be of any other desired configuration consistent with avoiding the above described differential thermal expansion effects.
  • a reference member may be provided fixed relative to the housing 201 and extending in cantilever parallel to the axis X- x but disposed externally of the casing with appropriate sensing means similar to the means 214 described hereinbefore provided to sense variation in the distance between a part of the reference member adjacent a free end thereof and an adjacent part of the casing 203.
  • Such an externally disposed reference member is not, however, preferred since it is liable to damage and to be interfered with by foreign bodies.
  • the reference member may be mounted in cantilever at the outer end of the casing 203 and extend inwardly so that its free end is adjacent the housing 201.
  • a sensing means similar to the sensing means 214 would be provided adjacent the housing 201.
  • the reference member may be mounted in cantilever at any desired position along the length of the casing 203 and may extend therefrom so that its free end is directed inwardly or outwardly relative to the housing 201 so long as the reference member is of sufficient length for there to be a change in distance between it and the casing for accurate measurement.
  • any other suitable sensor to sense the load on each rear wheel 18g. 18b may be provided.
  • a displacement sensing means 180 such as a transducer or micro-switch, senses displacement d of an upper end 181 of a bar 182 fixed, at its lower end 183, for example by welding, to a bracket 1 84 carried by the axle 173.
  • the sensors may comprise a strain gauge 170', 171' provided on flanges 172 that mount the rear axle 173 on the rear chassis part 13.
  • a pair of single or double acting hydraulic rams or one double acting hydraulic ram may be connected between the rear chassis part and the rear axle, which may itself be mounted for oscillation on the rear chassis part and the flow of fluid from and/or to these rams may be used to provide a signal to control hydraulical'y actuated valves corresponding to the electrically operated valves 142, 143 ( 142a, 143g).
  • the stabilising system is applied to an oscillating member comprising an axie.
  • the stabilising system may be provided between the oscillating chassis parts in which case the oscillating member would be one of the chassis parts, and the actuator or actuators would be connected between the chassis parts.
  • each of the first and second pairs of wheels may be carried on an oscillating member which can pivot relative to an associated chassis part and the chassis parts may themselves be pivotally interconnected about a generally horizontal axis in which case an appropriate number of stabilising systems may be provided for each pair of oscillating parts.
  • Appropriate sensing means to sense the ground engaging force transmitted by an appropriate ground engageable means of the vehicle, e.g. one diagonally opposite to the respective actuator.
  • stabilising system 140 is described in relation to an articulated loading vehicle, the Invention may be applied to any other load carrying vehicle, and many other types of articulated and non-articulated vehicle as required which may have an oscillating axle.
  • the vehicle 10 only has a stabilising system associated with the axle 30 carried on the front ground wheels 17, which is an oscillating axle.
  • the axle carrying the rear ground wheels 18 is rigid.
  • both the axles carrving the front wheels 17 and the rear wheels 18 may be of the oscillating type and mav each have a stabilising system associated therewith.
  • the axles carrying the front and rear wheels 17, 18 are driven so that the vehicle is a four-wheel drive vehicle
  • the stabilising system may be applied to a vehicle in which drive is transmitted through only two wheels so that the hubs 21 , for example, may not be driven.
  • the hub 31 of the front wheels and/or the corresponding hubs on the rear wheels may be movable to effect sfeerina of the vehicle.
  • a single wheel is mounted ad acent the end of each axle, if desired a plurality of wheels may be provided adjacent the end of each axle.
  • the wheels may be carried on a sub-frame mounted on the axle and again each such wheel may have another wheel or wheels disposed side by side.
  • the vehicle may be provided with endless tracks commonly known as "caterpil lar tracks”.
  • a discrete endless track or tracks in tandem and/or side by side may be provided adjacent the end of each axle or an endless track or tracks may be common to the ends of the axles on each side of the vehicle.
  • ground engageable means is used herein to encompass all such arrangements.
  • actuators described herein are linear actuators if desired other forms of actuator may be provided such as rotary actuators.

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  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Vehicle Body Suspensions (AREA)
  • Seal Device For Vehicle (AREA)
  • Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
  • Centrifugal Separators (AREA)

Abstract

L'invention concerne un véhicule comprenant une première paire de moyens (17, 18) venant au contact du sol, portés sur un premier élément oscillant (30), pivotant autour d'un axe sensiblement horizontal (35) par rapport à un second élément oscillant portant une seconde paire de moyens venant au contact du sol, ainsi qu'un système de stabilisation. Ledit système de stabilisation comporte un moyen (138, 139) d'actionnement hydraulique relié entre les éléments oscillants afin de commander l'oscillation entre ces derniers autour dudit axe sensiblement horizontal, un passage permettant à du liquide de s'écouler vers une chambre du moyen d'actionnement et inversement, en réponse à l'oscillation des éléments, ainsi que des clapets (142, 143) destinés à réguler l'écoulement de liquide dans ledit passage, dans un sens permettant de réguler l'oscillation entre lesdits éléments, lesdits clapets étant actionnés par un signal de commande dépendant d'une force de contact avec le sol transmise par un moyen dudit véhicule venant au contact du sol.
EP90900231A 1988-11-17 1989-11-17 Vehicule Ceased EP0396731A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
GB888826883A GB8826883D0 (en) 1988-11-17 1988-11-17 Vehicle
GB8826883 1988-11-17
GB8916261 1989-07-15
GB898916261A GB8916261D0 (en) 1989-07-15 1989-07-15 Vehicle

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EP0396731A1 true EP0396731A1 (fr) 1990-11-14

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EP90900231A Ceased EP0396731A1 (fr) 1988-11-17 1989-11-17 Vehicule

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EP (1) EP0396731A1 (fr)
AU (1) AU627808B2 (fr)
CA (1) CA2003254A1 (fr)
DK (1) DK171790D0 (fr)
FI (1) FI903587A7 (fr)
GB (1) GB2224982B (fr)
WO (1) WO1990005815A1 (fr)

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DE4123289A1 (de) * 1991-07-13 1993-01-14 Reinhard Ebert Fahrzeug mit seitlicher abstuetzung des fahrzeugrahmens
AUPN384395A0 (en) 1995-06-27 1995-07-20 Kinetic Limited Control method for vehicle suspension system
IT1318066B1 (it) 2000-06-29 2003-07-21 Dana Italia Spa Dispositivo di misura e controllo delle condizioni di stabilita' di un veicolo, in particolare di un veicolo industriale.
EP3213941B1 (fr) * 2016-03-02 2019-05-01 Bucher Hydraulics Erding GmbH Dispositif de commande d'un arbre oscillant, bloc d'arbre oscillant et machine de travail mobile comprenant au moins un arbre oscillant
AU2017248349B2 (en) 2016-04-08 2021-11-11 Oshkosh Corporation Leveling system for lift device
DE102017108156A1 (de) * 2017-04-18 2018-10-18 Linde Material Handling Gmbh Flurförderzeug mit mindestens einem Lastrad

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FR1406770A (fr) * 1963-08-02 1965-07-23 Wagner Mfg Véhicule de chargement à déversement latéral
NL156203B (nl) * 1969-08-07 1978-03-15 Frisch Geb Kg Eisenwerk Egaliseermachine.
SE440733B (sv) * 1973-12-07 1985-08-19 Sten Ove Hammarstrand Axelpendlingssystem for terrengfordon
US4236591A (en) * 1978-08-17 1980-12-02 Molby Lloyd A Off-road vehicle that both oscillates and articulates
AT377730B (de) * 1981-09-28 1985-04-25 Voest Alpine Ag Einrichtung zum blockieren der pendelbewegung einer pendelachse eines radfahrzeuges, insbesondere eines radladers
WO1984002886A1 (fr) * 1983-01-21 1984-08-02 Lotus Car Systeme de suspension d'un vehicule
JPH075009B2 (ja) * 1985-10-22 1995-01-25 トヨタ自動車株式会社 車輌用車高調整装置
DE3632416A1 (de) * 1986-09-24 1988-04-07 Schaeff Karl Gmbh & Co Knickgelenktes arbeitsfahrzeug mit hoehenverstellbaren raedern
GB8808778D0 (en) * 1988-04-14 1988-05-18 Bamford Excavators Ltd Vehicle

Non-Patent Citations (1)

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See references of WO9005815A1 *

Also Published As

Publication number Publication date
GB2224982B (en) 1992-09-09
CA2003254A1 (fr) 1990-05-17
FI903587A0 (fi) 1990-07-16
FI903587A7 (fi) 1990-07-16
DK171790A (da) 1990-07-17
GB8926043D0 (en) 1990-01-10
AU4652989A (en) 1990-06-12
AU627808B2 (en) 1992-09-03
WO1990005815A1 (fr) 1990-05-31
GB2224982A (en) 1990-05-23
DK171790D0 (da) 1990-07-17

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