WO2019197012A1 - Stop element for a robot having a chassis and a free rear axle housing with two axes of rotation with respect to the chassis - Google Patents

Stop element for a robot having a chassis and a free rear axle housing with two axes of rotation with respect to the chassis Download PDF

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Publication number
WO2019197012A1
WO2019197012A1 PCT/EP2018/058990 EP2018058990W WO2019197012A1 WO 2019197012 A1 WO2019197012 A1 WO 2019197012A1 EP 2018058990 W EP2018058990 W EP 2018058990W WO 2019197012 A1 WO2019197012 A1 WO 2019197012A1
Authority
WO
WIPO (PCT)
Prior art keywords
plate
chassis
robot according
robot
axle housing
Prior art date
Application number
PCT/EP2018/058990
Other languages
French (fr)
Inventor
Xavier David Beaulieu
Original Assignee
Vitirover
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
Application filed by Vitirover filed Critical Vitirover
Priority to PCT/EP2018/058990 priority Critical patent/WO2019197012A1/en
Publication of WO2019197012A1 publication Critical patent/WO2019197012A1/en
Priority to US17/065,935 priority patent/US20210022292A1/en

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60B—VEHICLE WHEELS; CASTORS; AXLES FOR WHEELS OR CASTORS; INCREASING WHEEL ADHESION
    • B60B35/00—Axle units; Parts thereof ; Arrangements for lubrication of axles
    • B60B35/004—Mounting arrangements for axles
    • B60B35/005—Mounting arrangements for axles with adaptations at chassis structure
    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01D—HARVESTING; MOWING
    • A01D34/00—Mowers; Mowing apparatus of harvesters
    • A01D34/006—Control or measuring arrangements
    • A01D34/008—Control or measuring arrangements for automated or remotely controlled operation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60B—VEHICLE WHEELS; CASTORS; AXLES FOR WHEELS OR CASTORS; INCREASING WHEEL ADHESION
    • B60B35/00—Axle units; Parts thereof ; Arrangements for lubrication of axles
    • B60B35/003—Steerable axles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60B—VEHICLE WHEELS; CASTORS; AXLES FOR WHEELS OR CASTORS; INCREASING WHEEL ADHESION
    • B60B35/00—Axle units; Parts thereof ; Arrangements for lubrication of axles
    • B60B35/004—Mounting arrangements for axles
    • B60B35/006—Mounting arrangements for axles with mounting plates or consoles fitted to axles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60B—VEHICLE WHEELS; CASTORS; AXLES FOR WHEELS OR CASTORS; INCREASING WHEEL ADHESION
    • B60B35/00—Axle units; Parts thereof ; Arrangements for lubrication of axles
    • B60B35/02—Dead axles, i.e. not transmitting torque
    • B60B35/04—Dead axles, i.e. not transmitting torque straight
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60B—VEHICLE WHEELS; CASTORS; AXLES FOR WHEELS OR CASTORS; INCREASING WHEEL ADHESION
    • B60B35/00—Axle units; Parts thereof ; Arrangements for lubrication of axles
    • B60B35/12—Torque-transmitting axles
    • B60B35/121—Power-transmission from drive shaft to hub
    • B60B35/122—Power-transmission from drive shaft to hub using gearings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60B—VEHICLE WHEELS; CASTORS; AXLES FOR WHEELS OR CASTORS; INCREASING WHEEL ADHESION
    • B60B35/00—Axle units; Parts thereof ; Arrangements for lubrication of axles
    • B60B35/12—Torque-transmitting axles
    • B60B35/16—Axle housings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G9/00—Resilient suspensions of a rigid axle or axle housing for two or more wheels
    • B60G9/02—Resilient suspensions of a rigid axle or axle housing for two or more wheels the axle or housing being pivotally mounted on the vehicle, e.g. the pivotal axis being parallel to the longitudinal axis of the vehicle
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K1/00—Arrangement or mounting of electrical propulsion units
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K7/00—Disposition of motor in, or adjacent to, traction wheel
    • B60K7/0007—Disposition of motor in, or adjacent to, traction wheel the motor being electric
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60B—VEHICLE WHEELS; CASTORS; AXLES FOR WHEELS OR CASTORS; INCREASING WHEEL ADHESION
    • B60B35/00—Axle units; Parts thereof ; Arrangements for lubrication of axles
    • B60B35/004—Mounting arrangements for axles
    • B60B35/006—Mounting arrangements for axles with mounting plates or consoles fitted to axles
    • B60B35/007—Mounting arrangements for axles with mounting plates or consoles fitted to axles for mounting suspension elements to axles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60B—VEHICLE WHEELS; CASTORS; AXLES FOR WHEELS OR CASTORS; INCREASING WHEEL ADHESION
    • B60B35/00—Axle units; Parts thereof ; Arrangements for lubrication of axles
    • B60B35/12—Torque-transmitting axles
    • B60B35/121—Power-transmission from drive shaft to hub
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60B—VEHICLE WHEELS; CASTORS; AXLES FOR WHEELS OR CASTORS; INCREASING WHEEL ADHESION
    • B60B35/00—Axle units; Parts thereof ; Arrangements for lubrication of axles
    • B60B35/12—Torque-transmitting axles
    • B60B35/14—Torque-transmitting axles composite or split, e.g. half- axles; Couplings between axle parts or sections
    • 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
    • B60G2200/322—Rigid axle suspensions pivoted with a single pivot point and a straight axle
    • 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
    • B60G2204/45—Stops limiting travel
    • B60G2204/4502—Stops limiting travel using resilient buffer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2300/00—Indexing codes relating to the type of vehicle
    • B60G2300/26—Carts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2300/00—Indexing codes relating to the type of vehicle
    • B60G2300/50—Electric vehicles; Hybrid vehicles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K7/00—Disposition of motor in, or adjacent to, traction wheel
    • B60K2007/0038—Disposition of motor in, or adjacent to, traction wheel the motor moving together with the wheel axle
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K7/00—Disposition of motor in, or adjacent to, traction wheel
    • B60K2007/0061—Disposition of motor in, or adjacent to, traction wheel the motor axle being parallel to the wheel axle
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K7/00—Disposition of motor in, or adjacent to, traction wheel
    • B60K2007/0092—Disposition of motor in, or adjacent to, traction wheel the motor axle being coaxial to the wheel axle

Definitions

  • the invention relates to a robot having a chassis and a free rear axle housing with two axes of rotation with respect to the chassis.
  • An object of the invention is, in particular, to provide a robot having a chassis and a free rear axle housing with two axes of rotation with respect to the chassis which ensure a longer life of the chassis as compared to the known robot having a chassis and a free rear axle housing with two axes of rotation of the previous art.
  • Another object of the invention is to provide a robot a chassis and a free rear axle housing with two axes of rotation with respect to the chassis which is more suitable for its use in the agricultural fields as compared to the known robot having a chassis and a free rear axle housing with two axes of rotation of the previous art.
  • the invention relates to a robot having a chassis and a free rear axle housing with two axes of rotation with respect to the chassis, characterized in that it comprises a stop device for circumscribing in space the displacements of the rear axle.
  • the stop device comprises a plate of rectangular shape defining a main plane and a center of the rectangular shape.
  • the plane orthogonal to the main plane and extending in the longitudinal direction of the plate and passing through the center of the rectangle is a plane of symmetry of the stop device.
  • the plane orthogonal to the main plane and extending in the direction transverse to the longitudinal direction of the plate and passing through the center of the rectangle may be a plane of symmetry of the stop device.
  • Four screw passages may be formed at the corners of a rectangle centered on the center of the plate.
  • damper passages may be formed in the plate at the corners of a rectangle centered on the center of the plate.
  • the stop device has four stops distributed symmetrically with respect to the two planes of symmetry of the stop device.
  • a stop has a right-angled triangle section whose right angle is disposed at one end of the rectangle forming the plate, one side of the right angle being oriented in the longitudinal direction of the plate, the other side the right angle being directed in the direction of a longitudinal plane perpendicular to the main plane.
  • the plate in a vertical section transverse to the longitudinal direction of the plate, the plate is hollowed out on a lower central portion to form a "P" which upper left and right interior angles are provided with fillets.
  • the free rear axle housing is arranged to receive two wheels and intended to provide steering and propulsion functions of said two wheels, said axle being equipped on either side with a motor [geared motor], each motor having a stator part intended for to be fixed to the axle and a rotor part to be rotatably mounted to said wheel, said robot being further arranged to receive control electronics configured to control each of the motors fixed to said axle.
  • a motor geared motor
  • FIG. 1 is a perspective view of a mowing robot according to the invention.
  • FIG. 1 is a perspective view of the bottom of the robot of Figure 1;
  • Figure 3 is another perspective view of Figure 1;
  • FIG. 4 is a perspective view of the bottom of the robot of Figure 1;
  • FIG. 5 is a perspective view of the rear axle of the robot of Figure 1;
  • FIG. 6 is a perspective view of a stop element of the rear axle of Figure 5;
  • - Figure 7 is a perspective view and a down section of a stop element of Figure 6;
  • - Figure 8 is a multi-view projection, front, top and bottom, left and right, of the stop element of Figure 6.
  • variants of the invention comprising only a selection of characteristics described, subsequently isolated from the other characteristics described, if this selection of characteristics is sufficient to confer a technical advantage or to differentiate the invention from the state of the art.
  • This selection comprises at least one characteristic, preferably functional without structural details, or with only a part of the structural details if this part only is sufficient to confer a technical advantage or to differentiate the invention from the prior art.
  • Figure 1 is a perspective view of a mowing robot 1 according to the invention.
  • the mowing robot 1 comprises a chassis 2 which is linked to a front axle housing 100 and to a rear axle housing 200.
  • the front axle housing 100 is fixed to the chassis 2.
  • the front axle housing 100 is linked to two front wheels 102 and 104, which are rotating around the front axle housing 3.
  • the front axle housing 100 At the end of the front axle housing 100 at the wheel 102, the front axle housing 100 comprises a motor 110.
  • the stator part 112 of the motor is fixed to the front axle housing 100 via a radially external part of a bearing 120 (no shown on the figures).
  • the wheel 102 is fixed to a rotatory part 114 of the motor 110 via the radially internal part of the bearing 120.
  • the front axle housing 100 At the end of the front axle housing 100 at the wheel 104, the front axle housing 100 comprises a motor 130.
  • the stator part 132 (not shown on the figures) of the motor is fixed to the front axle housing 100 via a radially external part of a bearing 140 (not shown on the figures).
  • the wheel 104 is fixed to a rotatory part 134 (not shown on the figures) of the motor 130 via the radially internal part of the bearing 120.
  • a cable duct 150 is provided to pass electrical wires, which are not shown in the figures, connected to the motors 110 and 130.
  • the rear axle housing 200 is linked to two rear wheels 202 and 204, which are rotating around the front axle housing 3.
  • the front axle housing 200 comprises a motor 210.
  • the stator part 212 (not shown on the figures) of the motor is fixed to the rear axle housing 200 via a radially external part of a bearing 220 (not shown on the figures).
  • the wheel 202 is fixed to a rotatory part 214 (not shown on the figures) of the motor 210 via the radially internal part of the bearing 220.
  • the front axle housing 100 comprises a motor 230.
  • the stator part 232 (not shown on the figures) of the motor is fixed to the front axle housing 200 via a radially external part of a bearing 240 (no shown on the figures).
  • the wheel 204 is fixed to a rotatory part 234 (not shown on the figures) of the motor 230 via the radially internal part of the bearing 220.
  • a cable duct 250 is provided to pass electrical wires connected to the motor 210 and 230 which are not shown in the figures.
  • the rear axle housing 200 is pivotally mounted on a steering pivot 400 around an horizontal axis, which is perpendicular to the longitudinal axis of the rear axle housing 200.
  • the steering pivot 400 is pivotally mounted on a blocking device 500 around a vertical axis.
  • the blocking device 500 is adapted to circumscribe in space the displacements of the rear axle housing 200.
  • the blocking device 500 comprises four damping devices 550, as rubber. The damping devices help to ensure long life for the blocking device.
  • the blocking device 500 device is fixed on the chassis 2. Therefore, the chassis 2 can rotate around the forward driving direction and around the vertical direction.
  • a cable duct 600 is provided to pass electrical wires, which are not shown in the figures, connected to the motors 210 and 230.
  • the motors 210, 230 are controlled by a controller 300 which is fixed to the chassis 2.
  • the controller 300 controls the motors 210 and 230 in order to change the direction of the mowing robot 1, by pivoting the chassis 2 around the rear axle housing. Therefore, the rear axle housing is a drive and steering axle.
  • the controller 300 is configured to control the motors 210 and 230 with two different speed rotations.
  • the motors 110, 130, are also controlled by the controller 300.
  • the controller 300 is configured to control the motors 110 and 130 with a same speed rotation. Therefore, the front axle housing is a drive axle but not a steering axle.
  • the blocking device 500 might be better seen on Figures 6 and 7.
  • the device 500 comprises a plate 502 of rectangular shape centered around a vertical axis z.
  • the plate has a main plane extending in both directions of its rectangular shape.
  • the device 500 comprises on one side of the plate 502 with respect to the z axis, a cylinder 504 of annular section.
  • the outer diameter of the annular section is smaller than the width of the plate 502.
  • the inside diameter of the annular section is sufficient to allow a passage of electric cable.
  • the plate 502 has at its center a recess 508 which cooperates with the recess of the cylinder 504 of annular section.
  • the recess of 508 is of the same diameter as the inside diameter of the annular section.
  • passages 510 are formed at the corners of a rectangle centered on the center of the plate 502.
  • the passages 510 allow the fixing by screw and bolt of the plate 502 on the frame 2.
  • passages 512 are formed in the plate at the corners of a rectangle centered on the center of the plate 502.
  • the passages 512 allow the insertion of the damping device 550 which opens on the opposite side to the cylinder 504 with respect to the z axis.
  • the plane orthogonal to the main plane and extending in the longitudinal direction of the plate and passing through the middle of the width of the rectangle forming the plate is a plane of symmetry of the device 500.
  • the plane orthogonal to the main plane and extending in the direction transverse to the longitudinal direction of the plate and passing through the middle of the length of the rectangle forming the plate is a plane of symmetry of the device 500.
  • the device 500 On the side of the plate 502 opposite the cylinder 504 with respect to the axis z, the device 500 has four stops 506 distributed symmetrically with respect to the two planes of symmetry of the device 500.
  • a stop 506 has a right-angled triangle section whose right angle is disposed at one end of the rectangle forming the plate 502, one side of the right angle being oriented in the longitudinal direction of the plate, the other side the right angle being directed in the direction of the axis z opposite to the cylinder 504.
  • the stop has an extension of the right triangle in the direction of the width of the rectangle forming the plate 502.
  • Figure 8 shows the device 500 in a multi-view projection, front, top and bottom, left and right, according to the US third-angle projection.
  • the plate 502 In a vertical section transverse to the longitudinal direction of the plate 502, the plate 502 is hollowed out on a lower central portion to form a "P" which upper left and right interior angles are provided with fillet.

Abstract

A robot (1) having a chassis (2) and a free rear axle housing (200) with two axes of rotation with respect to the chassis, characterized in that it comprises a stop device (500) for circumscribing in space the displacements of the rear axle.

Description

STOP ELEMENT FOR A ROBOT HAVING A CHASSIS AND A FREE REAR AXLE HOUSING
WITH TWO AXES OF ROTATION WITH RESPECT TO THE CHASSIS
Field of the invention
The invention relates to a robot having a chassis and a free rear axle housing with two axes of rotation with respect to the chassis.
Object of the invention
An object of the invention is, in particular, to provide a robot having a chassis and a free rear axle housing with two axes of rotation with respect to the chassis which ensure a longer life of the chassis as compared to the known robot having a chassis and a free rear axle housing with two axes of rotation of the previous art.
Another object of the invention is to provide a robot a chassis and a free rear axle housing with two axes of rotation with respect to the chassis which is more suitable for its use in the agricultural fields as compared to the known robot having a chassis and a free rear axle housing with two axes of rotation of the previous art.
Summary of the invention
To this effect, the invention relates to a robot having a chassis and a free rear axle housing with two axes of rotation with respect to the chassis, characterized in that it comprises a stop device for circumscribing in space the displacements of the rear axle.
Preferably, the stop device comprises a plate of rectangular shape defining a main plane and a center of the rectangular shape.
Preferably, the plane orthogonal to the main plane and extending in the longitudinal direction of the plate and passing through the center of the rectangle is a plane of symmetry of the stop device.
The plane orthogonal to the main plane and extending in the direction transverse to the longitudinal direction of the plate and passing through the center of the rectangle may be a plane of symmetry of the stop device. Four screw passages may be formed at the corners of a rectangle centered on the center of the plate.
Four damper passages may be formed in the plate at the corners of a rectangle centered on the center of the plate.
Preferably, the stop device has four stops distributed symmetrically with respect to the two planes of symmetry of the stop device.
Preferably, a stop has a right-angled triangle section whose right angle is disposed at one end of the rectangle forming the plate, one side of the right angle being oriented in the longitudinal direction of the plate, the other side the right angle being directed in the direction of a longitudinal plane perpendicular to the main plane.
In an embodiment, in a vertical section transverse to the longitudinal direction of the plate, the plate is hollowed out on a lower central portion to form a "P" which upper left and right interior angles are provided with fillets.
Preferably, the free rear axle housing is arranged to receive two wheels and intended to provide steering and propulsion functions of said two wheels, said axle being equipped on either side with a motor [geared motor], each motor having a stator part intended for to be fixed to the axle and a rotor part to be rotatably mounted to said wheel, said robot being further arranged to receive control electronics configured to control each of the motors fixed to said axle.
Figures
Many other features and advantages of the present invention will become apparent from reading the following detailed description, when considered in conjunction with the accompanying drawings, in which:
- Figure 1 is a perspective view of a mowing robot according to the invention;
- Figure 2 is a perspective view of the bottom of the robot of Figure 1;
- Figure 3 is another perspective view of Figure 1;
- Figure 4 is a perspective view of the bottom of the robot of Figure 1;
- Figure 5 is a perspective view of the rear axle of the robot of Figure 1;
- Figure 6 is a perspective view of a stop element of the rear axle of Figure 5;
- Figure 7 is a perspective view and a down section of a stop element of Figure 6; - Figure 8 is a multi-view projection, front, top and bottom, left and right, of the stop element of Figure 6.
Detailed description of specific embodiments of the invention
The embodiments described hereinafter being in no way limiting, it is possible in particular to consider variants of the invention comprising only a selection of characteristics described, subsequently isolated from the other characteristics described, if this selection of characteristics is sufficient to confer a technical advantage or to differentiate the invention from the state of the art. This selection comprises at least one characteristic, preferably functional without structural details, or with only a part of the structural details if this part only is sufficient to confer a technical advantage or to differentiate the invention from the prior art.
The same references are used for identical elements or elements achieving the same function in the different embodiments of the invention that will be described.
Figure 1 is a perspective view of a mowing robot 1 according to the invention.
The mowing robot 1 comprises a chassis 2 which is linked to a front axle housing 100 and to a rear axle housing 200.
The front axle housing 100 is fixed to the chassis 2.
The front axle housing 100 is linked to two front wheels 102 and 104, which are rotating around the front axle housing 3.
At the end of the front axle housing 100 at the wheel 102, the front axle housing 100 comprises a motor 110.
The stator part 112 of the motor is fixed to the front axle housing 100 via a radially external part of a bearing 120 (no shown on the figures). The wheel 102 is fixed to a rotatory part 114 of the motor 110 via the radially internal part of the bearing 120.
At the end of the front axle housing 100 at the wheel 104, the front axle housing 100 comprises a motor 130.
The stator part 132 (not shown on the figures) of the motor is fixed to the front axle housing 100 via a radially external part of a bearing 140 (not shown on the figures). The wheel 104 is fixed to a rotatory part 134 (not shown on the figures) of the motor 130 via the radially internal part of the bearing 120.
A cable duct 150 is provided to pass electrical wires, which are not shown in the figures, connected to the motors 110 and 130.
The rear axle housing 200 is linked to two rear wheels 202 and 204, which are rotating around the front axle housing 3.
At the end of the rear axle housing 200 at the wheel 202, the front axle housing 200 comprises a motor 210.
The stator part 212 (not shown on the figures) of the motor is fixed to the rear axle housing 200 via a radially external part of a bearing 220 (not shown on the figures). The wheel 202 is fixed to a rotatory part 214 (not shown on the figures) of the motor 210 via the radially internal part of the bearing 220.
At the end of the rear axle housing 200 at the wheel 204, the front axle housing 100 comprises a motor 230.
The stator part 232 (not shown on the figures) of the motor is fixed to the front axle housing 200 via a radially external part of a bearing 240 (no shown on the figures). The wheel 204 is fixed to a rotatory part 234 (not shown on the figures) of the motor 230 via the radially internal part of the bearing 220.
A cable duct 250 is provided to pass electrical wires connected to the motor 210 and 230 which are not shown in the figures.
The rear axle housing 200 is pivotally mounted on a steering pivot 400 around an horizontal axis, which is perpendicular to the longitudinal axis of the rear axle housing 200.
The steering pivot 400 is pivotally mounted on a blocking device 500 around a vertical axis.
The blocking device 500 is adapted to circumscribe in space the displacements of the rear axle housing 200. The blocking device 500 comprises four damping devices 550, as rubber. The damping devices help to ensure long life for the blocking device.
The blocking device 500 device is fixed on the chassis 2. Therefore, the chassis 2 can rotate around the forward driving direction and around the vertical direction.
A cable duct 600 is provided to pass electrical wires, which are not shown in the figures, connected to the motors 210 and 230.
Therefore, the motors 210, 230, are controlled by a controller 300 which is fixed to the chassis 2.
The controller 300 controls the motors 210 and 230 in order to change the direction of the mowing robot 1, by pivoting the chassis 2 around the rear axle housing. Therefore, the rear axle housing is a drive and steering axle.
In order to rotate the chassis 2 around the rear axle housing, the controller 300 is configured to control the motors 210 and 230 with two different speed rotations.
The motors 110, 130, are also controlled by the controller 300.
In this embodiment, the controller 300 is configured to control the motors 110 and 130 with a same speed rotation. Therefore, the front axle housing is a drive axle but not a steering axle.
The blocking device 500 might be better seen on Figures 6 and 7.
The device 500 comprises a plate 502 of rectangular shape centered around a vertical axis z. The plate has a main plane extending in both directions of its rectangular shape.
The device 500 comprises on one side of the plate 502 with respect to the z axis, a cylinder 504 of annular section. The outer diameter of the annular section is smaller than the width of the plate 502. The inside diameter of the annular section is sufficient to allow a passage of electric cable.
As shown in Figure 7b, the plate 502 has at its center a recess 508 which cooperates with the recess of the cylinder 504 of annular section. The recess of 508 is of the same diameter as the inside diameter of the annular section.
Four passages 510 are formed at the corners of a rectangle centered on the center of the plate 502. The passages 510 allow the fixing by screw and bolt of the plate 502 on the frame 2. Four other passages 512 are formed in the plate at the corners of a rectangle centered on the center of the plate 502. The passages 512 allow the insertion of the damping device 550 which opens on the opposite side to the cylinder 504 with respect to the z axis.
The plane orthogonal to the main plane and extending in the longitudinal direction of the plate and passing through the middle of the width of the rectangle forming the plate is a plane of symmetry of the device 500.
The plane orthogonal to the main plane and extending in the direction transverse to the longitudinal direction of the plate and passing through the middle of the length of the rectangle forming the plate is a plane of symmetry of the device 500.
On the side of the plate 502 opposite the cylinder 504 with respect to the axis z, the device 500 has four stops 506 distributed symmetrically with respect to the two planes of symmetry of the device 500.
More specifically, a stop 506 has a right-angled triangle section whose right angle is disposed at one end of the rectangle forming the plate 502, one side of the right angle being oriented in the longitudinal direction of the plate, the other side the right angle being directed in the direction of the axis z opposite to the cylinder 504. The stop has an extension of the right triangle in the direction of the width of the rectangle forming the plate 502.
Figure 8 shows the device 500 in a multi-view projection, front, top and bottom, left and right, according to the US third-angle projection.
In a vertical section transverse to the longitudinal direction of the plate 502, the plate 502 is hollowed out on a lower central portion to form a "P" which upper left and right interior angles are provided with fillet.
Of course, the invention is not limited to the examples which have just been described and numerous adjustments can be made to these examples without departing from the scope of the invention. In addition, the various features, forms, variants and embodiments of the invention can be combined with one another in various combinations insofar as they are not incompatible or exclusive of one another. Other variations to the disclosed embodiments can be understood and effected by those skilled in the art in practicing the claimed invention, from a study of the drawings, the disclosure, and the appended claims.

Claims

Claims
1. A robot (1) having a chassis (2) and a free rear axle housing (200) with two axes of rotation with respect to the chassis, characterized in that it comprises a stop device (500) for circumscribing in space the displacements of the rear axle.
2. Robot according to claim 1, wherein the stop device comprises a plate (502) of rectangular shape defining a main plane and a center of the rectangular shape.
3. Robot according to claim 2, wherein the plane orthogonal to the main plane and extending in the longitudinal direction of the plate and passing through the center of the rectangle is a plane of symmetry of the stop device( 500).
4. Robot according to any one of claims 2 to 3, wherein the plane orthogonal to the main plane and extending in the direction transverse to the longitudinal direction of the plate and passing through the center of the rectangle is a plane of symmetry of the stop device (500).
5. Robot according to any one of claims 2 to 4, wherein four screw passages (510) are formed at the corners of a rectangle centered on the center of the plate (502).
6. Robot according to any one of claims 2 to 5, wherein four damper passages (512) are formed in the plate at the corners of a rectangle centered on the center of the plate (502).
7. Robot according to any one of the previous claims and claim 3, wherein the stop device (500) has four stops (506) distributed symmetrically with respect to the two planes of symmetry of the stop device (500).
8. Robot according to the previous claim, wherein a stop (506) has a right-angled triangle section whose right angle is disposed at one end of the rectangle forming the plate (502), one side of the right angle being oriented in the longitudinal direction of the plate, the other side the right angle being directed in the direction of a longitudinal plane perpendicular to the main plane.
9. Robot according to any one of claims 2 to 8, wherein in a vertical section transverse to the longitudinal direction of the plate (502), the plate (502) is hollowed out on a lower central portion to form a "P" which upper left and right interior angles are provided with fillets.
10. Robot according to claim 1, wherein the free rear axle housing (200) is arranged to receive two wheels (202, 204) and intended to provide steering and propulsion functions of said two wheels, said axle being equipped on either side with a motor [geared motor](210, 230), each motor having a stator part intended for to be fixed to the axle and a rotor part to be rotatably mounted to said wheel, said robot being further arranged to receive control electronics (300) configured to control each of the motors fixed to said axle.
PCT/EP2018/058990 2018-04-09 2018-04-09 Stop element for a robot having a chassis and a free rear axle housing with two axes of rotation with respect to the chassis WO2019197012A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PCT/EP2018/058990 WO2019197012A1 (en) 2018-04-09 2018-04-09 Stop element for a robot having a chassis and a free rear axle housing with two axes of rotation with respect to the chassis
US17/065,935 US20210022292A1 (en) 2018-04-09 2020-10-08 Robot and method for controlling the robot

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2018/058990 WO2019197012A1 (en) 2018-04-09 2018-04-09 Stop element for a robot having a chassis and a free rear axle housing with two axes of rotation with respect to the chassis

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2018/058989 Continuation-In-Part WO2019197011A1 (en) 2018-04-09 2018-04-09 Connecting module for a brush cutter, edge trimmer or the like

Related Child Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2019/058942 Continuation-In-Part WO2019197397A1 (en) 2018-04-09 2019-04-09 Robot and method for controlling the robot

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3756911A1 (en) * 2019-06-26 2020-12-30 Lely Patent N.V. Vehicle with a swing axle and a stabilisation mechanism for the swing axle
US11607910B1 (en) * 2022-03-01 2023-03-21 Caterpillar Inc. Axle oscillation stop for construction machine

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1426205A2 (en) * 2002-12-04 2004-06-09 Jungheinrich Aktiengesellschaft Four-wheeled lift truck with oscillating axle
EP2389798A1 (en) * 2010-05-24 2011-11-30 Deere & Company Automatically adjustable axle oscillation stops
DE102012023999A1 (en) * 2012-07-07 2014-01-23 Hans-Heinrich Götting Driving guidance module for guiding and moving vehicles, has two motors that are configured for drive and feeding vehicle
WO2015192900A1 (en) * 2014-06-19 2015-12-23 Husqvarna Ab Improved robotic working tool
WO2016087998A2 (en) * 2014-12-02 2016-06-09 Husqvarna Ab All wheel drive robotic vehicle with steering brake
DE102015117585A1 (en) * 2015-10-15 2017-04-20 Martin Brielmaier Self-propelled baler

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1426205A2 (en) * 2002-12-04 2004-06-09 Jungheinrich Aktiengesellschaft Four-wheeled lift truck with oscillating axle
EP2389798A1 (en) * 2010-05-24 2011-11-30 Deere & Company Automatically adjustable axle oscillation stops
DE102012023999A1 (en) * 2012-07-07 2014-01-23 Hans-Heinrich Götting Driving guidance module for guiding and moving vehicles, has two motors that are configured for drive and feeding vehicle
WO2015192900A1 (en) * 2014-06-19 2015-12-23 Husqvarna Ab Improved robotic working tool
WO2016087998A2 (en) * 2014-12-02 2016-06-09 Husqvarna Ab All wheel drive robotic vehicle with steering brake
DE102015117585A1 (en) * 2015-10-15 2017-04-20 Martin Brielmaier Self-propelled baler

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3756911A1 (en) * 2019-06-26 2020-12-30 Lely Patent N.V. Vehicle with a swing axle and a stabilisation mechanism for the swing axle
NL2023388B1 (en) * 2019-06-26 2021-02-01 Lely Patent Nv Vehicle with a swing axle and a swing axle stabilization mechanism
US11607910B1 (en) * 2022-03-01 2023-03-21 Caterpillar Inc. Axle oscillation stop for construction machine

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