EP3766826B1 - Châssis de chariot élévateur à fourche élévatrice et chariot élévateur à fourche élévatrice - Google Patents

Châssis de chariot élévateur à fourche élévatrice et chariot élévateur à fourche élévatrice Download PDF

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Publication number
EP3766826B1
EP3766826B1 EP20185908.9A EP20185908A EP3766826B1 EP 3766826 B1 EP3766826 B1 EP 3766826B1 EP 20185908 A EP20185908 A EP 20185908A EP 3766826 B1 EP3766826 B1 EP 3766826B1
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EP
European Patent Office
Prior art keywords
auxiliary wheel
forklift truck
vehicle body
bracket
wheel bracket
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.)
Active
Application number
EP20185908.9A
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German (de)
English (en)
Other versions
EP3766826A1 (fr
Inventor
Xiaolu Zhang
Wenjie GUAN
Fengbo YU
Le SHANG
Juyun HU
Huaiyu Wang
Shulan DONG
Yexin MAO
Yongliang MA
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.)
Hangcha Group Co Ltd
Original Assignee
Hangcha Group Co 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.)
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Publication date
Priority claimed from CN201910650414.1A external-priority patent/CN110255447B/zh
Priority claimed from CN201921133806.2U external-priority patent/CN210340240U/zh
Application filed by Hangcha Group Co Ltd filed Critical Hangcha Group Co Ltd
Publication of EP3766826A1 publication Critical patent/EP3766826A1/fr
Application granted granted Critical
Publication of EP3766826B1 publication Critical patent/EP3766826B1/fr
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
    • B66F9/00—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes
    • B66F9/06—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes movable, with their loads, on wheels or the like, e.g. fork-lift trucks
    • B66F9/075—Constructional features or details
    • B66F9/07513—Details concerning the chassis
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
    • B66F9/00—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes
    • B66F9/06—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes movable, with their loads, on wheels or the like, e.g. fork-lift trucks
    • B66F9/075—Constructional features or details
    • B66F9/07586—Suspension or mounting of wheels on chassis
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
    • B66F9/00—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes
    • B66F9/06—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes movable, with their loads, on wheels or the like, e.g. fork-lift trucks
    • B66F9/075—Constructional features or details
    • B66F9/08—Masts; Guides; Chains
    • B66F9/10—Masts; Guides; Chains movable in a horizontal direction relative to truck

Definitions

  • the present invention relates to the technical field of forklift trucks, and in particular to a reach forklift truck chassis and a reach forklift truck.
  • a chassis adopts a four-wheel structure, and a spring is arranged between a drive wheel and a vehicle body and a spring is arranged between an auxiliary wheel and the vehicle body to buffer and absorb shock.
  • the arrangement of the springs increases the comfort of operation, but at the same time also brings disadvantages. In some use cases, such as hydraulic operation, the vehicle shakes more seriously, and is more likely to tip over when turning.
  • Japanese patent publication No. JPH06191251A discloses a suspension device for a reach-type forklift truck having a link mechanism for suspending a drive unit having drive wheels and a caster unit having auxiliary wheels on a body frame so as to be swing up and down.
  • the suspension device includes a buffer spring 58 between the drive wheel 51 and the body frame 54, and therefore is subject to the possibility of tipping over when running.
  • JPH06191251A discloses a drive wheel bracket, an auxiliary wheel bracket, a locking device and a controller, wherein the auxiliary wheel is connected below the auxiliary wheel bracket, a middle part of the auxiliary wheel bracket is hinged to a rotary shaft which is configured to connect to the vehicle body and wherein an input end of the locking device is electrically connected to an output end of the controller.
  • an object of the present invention is to provide a reach forklift truck chassis, which improves the operation safety of the reach forklift truck.
  • Another object of the present application is to provide a reach forklift truck including the aforementioned reach forklift truck chassis, the operation safety of which is improved.
  • a reach forklift truck chassis includes a drive wheel bracket, an auxiliary wheel bracket, a drive wheel connected below the drive wheel bracket and an auxiliary wheel connected below the auxiliary wheel bracket.
  • a drive wheel compression spring is connected to an upper side of the drive wheel bracket.
  • a middle part of the auxiliary wheel bracket is hinged to a first rotary shaft, and the first rotary shaft is configured to connect to the vehicle body.
  • a locking device is provided at the first end of the auxiliary wheel bracket, and the locking device is configured to control the first rotary shaft to be rigidly or rotationally connected to the auxiliary wheel bracket, to allow the auxiliary wheel bracket and the vehicle body to be rigidly or elastically connected.
  • An auxiliary wheel compression spring is connected between a second end of the auxiliary wheel bracket and the drive wheel bracket, and after compression deformation, the auxiliary wheel compression spring presses the auxiliary wheel bracket up and presses down the drive wheel bracket, and an input end of the locking device is electrically connected to an output end of the controller.
  • a lower connecting rod is rotatably connected to the first rotary shaft, and a connecting rod at a first end of the lower connecting rod blocks the auxiliary wheel bracket from above.
  • the drive wheel bracket includes a main bracket and a vertical bracket fixed below the main bracket, and a bottom end of the vertical bracket is pivotally connected to a second end of the lower connecting rod.
  • the auxiliary wheel compression spring and the drive wheel compression spring are respectively provided on both sides of the drive wheel.
  • the locking device includes a locking oil cylinder and a solenoid valve provided on the locking oil cylinder to control an oil passage of the locking oil cylinder.
  • the solenoid valve is electrically connected to the output end of the controller, and the solenoid valve correspondingly controls locking or floating of the locking oil cylinder by controlling on-off of the solenoid valve.
  • One end of the locking oil cylinder is connected to the first end of the auxiliary wheel bracket, and another end is configured to connect to the vehicle body.
  • a reach forklift truck includes the reach forklift truck chassis as described in any one of the above and a vehicle body connected to the reach forklift truck chassis.
  • the reach forklift truck further includes a hydraulic system connected to the vehicle body, where the hydraulic system includes a fork lifting oil passage corresponding to a fork on the vehicle body.
  • a pressure detection device is connected to the fork lifting oil passage, and an output end of the pressure detection device is connected to an input end of the controller.
  • the reach forklift truck further includes a gantry provided on the vehicle body, the gantry is provided with a height detection device for detecting a height of the gantry, and an output of the height detection device is electrically connected to the input of the controller.
  • the reach forklift truck further includes a gantry provided on the vehicle body and an operating handle provided in the vehicle body for controlling a movement of the gantry.
  • the operating handle is provided with a movement detection device for detecting whether the operating handle is in motion, and an output end of the movement detection device is electrically connected to an input end of the controller.
  • the movement detection device includes a front-back movement switch, a lifting switch and a lowering switch, each of which is electrically connected to the controller.
  • the vehicle body is connected to a front wheel and a steering wheel.
  • the front wheel and the drive wheel are connected to a speed sensor.
  • the steering wheel is connected to an angle sensor.
  • An output end of the speed sensor and an output end of the angle sensor are electrically connected to the input end of the controller, respectively.
  • the reach forklift truck includes a drive wheel bracket, an auxiliary wheel bracket, a drive wheel connected below the drive wheel bracket and an auxiliary wheel connected below the auxiliary wheel bracket.
  • a drive wheel compression spring is connected to the upper side of the drive wheel bracket.
  • the middle part of the auxiliary wheel bracket is hinged to the first rotary shaft.
  • a locking device is provided at the first end of the auxiliary wheel bracket, and the locking device is configured to control the first rotary shaft to be rigidly or rotationally connected to the auxiliary wheel bracket.
  • An auxiliary wheel compression spring is connected between the second end of the auxiliary wheel bracket and the drive wheel bracket, and after compression deformation, the auxiliary wheel compression spring presses the auxiliary wheel bracket up and presses down the drive wheel bracket, and the input end of the locking device is electrically connected with the output end of the controller.
  • connection rigidity between the auxiliary wheel and the vehicle body and the connection rigidity between the auxiliary wheel bracket and the vehicle body can be adjusted, thereby adjusting the overall rigidity of the vehicle.
  • the locking device is locked to improve the connection rigidity between the auxiliary wheel and the vehicle body and the connection rigidity between the auxiliary wheel bracket and the vehicle body, which can effectively improve the operation safety of the vehicle. It is also possible to unlock the locking device in other situations to improve the comfort of the vehicle operation, balance the advantages of rigid suspension and elastic suspension, and improve comfort and stability.
  • the reach forklift truck including the above reach forklift truck chassis according to the present invention has improved operation safety.
  • a core of the present invention is to provide a reach forklift truck chassis, which improves the operation safety of reach forklift truck.
  • Another core of the present invention is to provide a reach forklift truck including the aforementioned reach forklift truck chassis, the operation safety of which is improved.
  • the reach forklift truck chassis according to the present invention referring to Figures 1 to 8 , includes a drive wheel bracket 4, an auxiliary wheel bracket 9, a drive wheel 2 connected below the drive wheel bracket 4 and an auxiliary wheel 10 connected below the auxiliary wheel bracket 9.
  • the reach forklift truck chassis can be specifically used in a standing-drive reach forklift truck.
  • a drive wheel compression spring 1 is connected to the upper side of the drive wheel bracket 4.
  • the upper end of the drive wheel compression spring 1 is connected to the vehicle body 30.
  • the drive wheel is used to absorb shock between the vehicle body 30 and the drive wheel 2. After compression deformation, the drive wheel compression spring 1 presses the vehicle body 30 up and presses down the drive wheel bracket 4.
  • the middle part of the auxiliary wheel bracket 9 is hinged to the first rotary shaft 15.
  • the first rotary shaft 15 is connected to the vehicle body 30, and the vehicle body 30 can radially position the first rotary shaft 15 and is usually fixedly connected.
  • a locking device is provided at the first end of the auxiliary wheel bracket 9 (the right end of the auxiliary wheel bracket 9 in the orientation shown in Figure 2 ).
  • the locking device is used to control the first rotary shaft 15 to be rigidly or rotationally connected to the auxiliary wheel bracket 9.
  • the locking device limits the auxiliary wheel bracket 9, so that the auxiliary wheel bracket 9 cannot rotate relative to the first rotary shaft 15, thereby achieving a rigid connection between the auxiliary wheel bracket 9 and the vehicle body 30.
  • the locking device does not restrict the auxiliary wheel bracket 9, and the auxiliary wheel bracket can rotate relative to the first rotary shaft 15, thereby achieving the elastic connection of the auxiliary wheel bracket 9 and the vehicle body 30.
  • An auxiliary wheel compression spring 5 is connected between the second end of the auxiliary wheel bracket 9 (the left end of the auxiliary wheel bracket 9 in the orientation shown in Figure 2 ) and the drive wheel bracket 4, so that the drive wheel 2 and auxiliary wheel 10 are connected in association. After compression deformation, the auxiliary wheel compression spring 5 presses the auxiliary wheel bracket 9 up and presses down the drive wheel bracket 4.
  • the auxiliary wheel compression spring 5 can absorb shock between the auxiliary wheel 10 and the vehicle body 30 and between the drive wheel 2 and the vehicle body 30.
  • the suspension system of the chassis includes the auxiliary wheel compression spring 5 and the drive wheel compression spring 1.
  • the input end of the locking device is electrically connected to the output end of the controller 20, and the controller 20 can control the operating parameters such as the opening and closing of the locking device.
  • the locking device enters a locking state after being started and enters an unlocking state after being closed.
  • the auxiliary wheel bracket 9 will not shake relative to the first rotary shaft 15 and the vehicle body 30, and the top end of the auxiliary wheel compression spring 5 is fixed relative to the vehicle body 30, and can be completely used to absorb shock between the vehicle body 30 and the drive wheel 2.
  • the auxiliary wheel compression spring 5 can more stably share a part of the load of the drive wheel compression spring 1 when the locking device is locked, so that the floating range of the drive wheel compression spring 1 can be reduced, and the shaking degree and shaking times of the vehicle body 30 can be reduced.
  • the vehicle when the vehicle turns, the vehicle will tilt to one side due to centrifugal force.
  • the load on the side of the auxiliary wheel 10 gradually decreases, the load on the side of the drive wheel 2 gradually increases, and the vehicle body 30 rotates counterclockwise.
  • the auxiliary wheel 10 When the locking device is unlocked, the auxiliary wheel 10 will always touch the ground, the auxiliary wheel 10 is equivalent to driving the auxiliary wheel bracket 9 to rotate clockwise around the first rotary shaft 15, the left end of the auxiliary wheel bracket 9 is raised relative to the drive wheel bracket 4, and since the elastic force of the wheel compression spring 5 is reduced, the compression deformation of the drive wheel compression spring 1 is increased.
  • the auxiliary wheel bracket 9 rotates counterclockwise with the vehicle body 30, and the left end of the auxiliary wheel bracket 9 is lowered relative to the drive wheel bracket 4.
  • the deformation degree of the compression of the drive wheel compression spring 1 will be correspondingly reduced due to the increase of the elastic force of the auxiliary wheel compression spring 5, so that the deformation of the vehicle body 30 is smaller than that when the locking device is unlocking, which improves the connection rigidity between the drive wheel 2 and the vehicle body 30, and reduces the possibility of overturning.
  • the locking device should be locked when turning or going straight to improve the safety of the vehicle.
  • connection rigidity between the drive wheel 2 and the vehicle body 30 and the connection rigidity between the auxiliary wheel 10 and the vehicle body 30 can be improved by locking the locking device, so that the safety of the operation of the whole vehicle can be effectively improved, and the locking device can be unlocked under other conditions, so as to improve the comfort of the operation of the vehicle, balance the advantages of rigid suspension and elastic suspension, and improve the comfort and the stability.
  • the first rotary shaft 15 is also rotatably connected to a lower connecting rod 6.
  • a connecting rod 12 at a first end of the lower connecting rod 6 blocks the auxiliary wheel bracket 9 from above.
  • the drive wheel bracket includes a main bracket 13 and a vertical bracket 14 fixed below the main bracket 13. The bottom end of the vertical bracket 14 is pivotally connected to the second end of the lower connecting rod 6.
  • the lower connecting rod 6 and the auxiliary wheel bracket 9 are pivotally connected to the first rotary shaft 15.
  • the lower connecting rod 6 and the auxiliary wheel bracket 9 form an X-shaped structure.
  • the connecting rod 12 of the lower connecting rod 6 blocks the auxiliary wheel bracket 9, so that the first end of the auxiliary wheel bracket 9 can no longer move upwards relative to the first end of the lower connecting rod 6, thereby limiting the floating range of the auxiliary wheel bracket 9 and further improving the operation safety.
  • auxiliary wheel compression spring 5 and the drive wheel compression spring 1 are respectively arranged on both sides of the drive wheel 2, specifically on both sides in the axial direction of the drive wheel 2, so as to further improve the stability between the drive wheel 2 and the vehicle body 30.
  • the locking device includes a locking oil cylinder 8 and a solenoid valve 11 provided on the locking oil cylinder 8.
  • the locking oil cylinder 8 is locked or floated by the control of the solenoid valve 11.
  • the solenoid valve 11 is electrically connected to the output end of the controller 20.
  • the controller 20 controls on and off of the solenoid valve 11 to correspondingly open and close the locking oil cylinder 8 to lock or float the locking oil cylinder 8.
  • the locking oil cylinder 8 is used to facilitate the operation and reliable locking when adjusting the rigidity of the suspension system according to the vehicle condition. In the reach forklift truck, one end of the locking oil cylinder 8 is connected to the first end of the auxiliary wheel bracket 9, and another end is connected to the vehicle body 30.
  • the locking device is of an integral structure without an external oil passage.
  • the present application further provides a reach forklift truck including a reach forklift truck chassis and a vehicle body connected to the reach forklift truck chassis.
  • the reach forklift truck chassis may specifically be the reach forklift truck chassis according to any of the above embodiments, and the beneficial effects can refer to each of the above embodiments.
  • the reach forklift truck chassis can be specifically a standing-drive reach forklift truck, which adopts standing-drive operation and has a four-wheel structure.
  • the reach forklift truck also includes a hydraulic system connected to the vehicle body 30.
  • the hydraulic system includes a fork lifting oil passage corresponding to the fork on the vehicle body 30, and the fork lifting oil passage is connected to a pressure detection device 24, which may be a pressure switch or a pressure sensor.
  • the output end of the pressure detection device 24 is electrically connected to the input end of the controller 20.
  • the load condition of the fork 27 can be correspondingly determined, and then the full load and empty load conditions of the vehicle can be determined.
  • the controller 20 controls the rigidity of the suspension system to be increased to reduce or eliminate the impact and shaking during the lifting, lowering, forward movement and backward movement of the gantry 28.
  • the reach forklift truck includes a gantry 28 provided on the vehicle body 30, a fork 27 is specifically provided on the gantry 28.
  • the gantry 28 can move up and down, and back and forth.
  • the gantry 28 is provided with a height detection device 18 for detecting the height of the gantry 28, which may specifically be a sensor capable for detecting the height, such as a photoelectric sensor.
  • the output end of the height detection device 18 is electrically connected to the input end of the controller 20.
  • the controller 20 can control the opening and closing of the locking device according to the detection result of the height detection device 18.
  • the controller 20 controls the locking device to be locked to improve the stability of the vehicle.
  • the reach forklift truck includes an operating handle 25 provided in the vehicle body 30 for controlling the movement of the gantry 28.
  • the operating handle 25 is provided with a movement detection device for detecting whether the operating handle 25 is in motion, and may specifically be a photoelectric switch or a photoelectric sensor. Since the operation of the operating handle 25 is in correspondence with the operation of the gantry 28, whether the gantry 28 moves in the corresponding direction can be determined according to whether the operating handle 25 moves.
  • the output end of the movement detection device is electrically connected to the input end of the controller 20, and the controller 20 can control the opening and closing of the locking device according to the detection result of the movement detection device.
  • the controller 20 controls the locking device to start to be locked, thereby improving the connection rigidity of the suspension system.
  • the impact is small, the center of gravity of the rear axle changes, and the controller 20 controls the locking device to be closed to unlock and improve the elasticity of the suspension system.
  • the movement detection device is provided on the operating handle 25 instead of directly on the gantry 28, which is convenient for installation.
  • the movement detection device includes a front-back movement switch 21, a lifting switch 22 and a lowering switch 23.
  • the front-back movement switch 21 is used to detect the movement of the operating handle 25 during controlling the forward and backward movement of the gantry 28
  • the lifting switch 22 is used to detect the movement of the operating handle 25 during controlling the lifting of the gantry 28
  • the lowering switch 23 is used to detect the movement of the operating handle 25 during controlling the lowering of the gantry 28.
  • the vehicle body 30 is further connected to a front wheel and a steering wheel, the front wheel and the drive wheel 2 are connected to a speed sensor 19, and the steering wheel is connected to an angle sensor 26.
  • the output end of the speed sensor 19 and the output end the angle sensor 26 are electrically connected to the input end of the controller 20, respectively.
  • the speed sensor 19 can detect the speed of the corresponding wheel. Specifically, it can be considered in combination with the pressure detection device 24 and the angle sensor 26.
  • the angle sensor 26 can reflect the turning speed of the forklift.
  • the controller 20 controls the rigidity of the suspension system in the chassis to increase.
  • the controller 20 controls the elasticity of the suspension system in the chassis to increase.
  • an acceleration sensor may be provided on the drive wheel 2 and/or the front wheel.
  • priority levels for these devices are usually preset in the controller, and control signals are output to the locking device according to the priority levels.
  • the locking device includes a locking oil cylinder 8 connected between the first end of the auxiliary wheel bracket 9 and the vehicle body 30 and a solenoid valve 11 provided on the locking oil cylinder 8.
  • the locking oil cylinder 8 is locked or floated by the control of the solenoid valve 11.
  • the solenoid valve 11 is electrically connected to the output end of the controller 20.
  • the controller 20 controls the solenoid valve 11 to open and close the locking oil cylinder 8, so that the rigidity degree of the suspension system is adjusted according to the vehicle, the operation is convenient, and the locking is reliable.
  • the drive wheel bracket 4 is pivotally connected to one end of the upper connecting rod 3, and another end of the upper connecting rod 3 is pivotally connected to the vehicle body 30.
  • the top end of the drive wheel compression spring 1 is fixed to the vehicle body 30 through the second connecting block 17.
  • the top end of the locking oil cylinder 8 is pivotally connected to the vehicle body 30 through the first connecting block 7 and the bottom end is pivotally connected to the first end of the auxiliary wheel bracket 9.
  • the first rotary shaft 15 is fixed to the vehicle body 30.
  • the locking device may be provided with other settings.
  • the locking device may be a linear motor, and one end of the linear motor is fixed to the vehicle body 30, and another end is not directly connected to the auxiliary wheel bracket 9.
  • the output shaft of the linear motor retracts, the rotation of the auxiliary wheel bracket 9 relative to the first rotary shaft 15 is not affected, but the auxiliary wheel bracket 9 is locked after the output shaft of the linear motor extends out and is clamped and fixed on the auxiliary wheel bracket 9.
  • a second locking device may be further provided between the drive wheel bracket 4 and the vehicle body 30, and the drive wheel bracket 4 and the vehicle body 30 may be relatively fixed together when locked, and the vehicle body 30 and the drive wheel bracket 4 can move relatively when unlocked, thereby directly adjusting the rigidity of the connection between the drive wheel bracket 4 and the vehicle body 30.

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  • Engineering & Computer Science (AREA)
  • Transportation (AREA)
  • Structural Engineering (AREA)
  • Civil Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Mechanical Engineering (AREA)
  • Forklifts And Lifting Vehicles (AREA)
  • Vehicle Body Suspensions (AREA)

Claims (10)

  1. Châssis de chariot élévateur à fourche à mât rétractable, comprenant :
    un support de roue motrice (4),
    un support de roue auxiliaire (9),
    une roue motrice (2) reliée au-dessous du support de roue motrice (4),
    une roue auxiliaire (10) reliée au-dessous du support de roue auxiliaire (9), et
    un ressort de compression de roue motrice (1) relié à un côté supérieur du support de roue motrice (4),
    dans lequel une partie médiane du support de roue auxiliaire (9) est articulée sur un premier arbre de rotation (15), et le premier arbre de rotation (15) est configuré pour être relié à une carrosserie de véhicule (30) ;
    un dispositif de verrouillage est prévu à une première extrémité du support de roue auxiliaire (9), et le dispositif de verrouillage est configuré pour commander le premier arbre de rotation (15) afin qu'il soit relié de manière rigide ou en rotation au support de roue auxiliaire (9), pour permettre au support de roue auxiliaire (9) et à la carrosserie de véhicule (30) d'être reliés de manière rigide ou élastique ;
    un ressort de compression de roue auxiliaire (5) est relié entre une deuxième extrémité du support de roue auxiliaire (9) et le support de roue motrice (4), et après déformation par compression, le ressort de compression de roue auxiliaire (5) presse le support de roue auxiliaire (9) vers le haut et presse vers le bas le support de roue motrice (4), et
    une borne d'entrée du dispositif de verrouillage est électriquement connectée à une borne de sortie du dispositif de commande (20).
  2. Châssis de chariot élévateur à fourche à mât rétractable selon la revendication 1, dans lequel,
    une biellette inférieure (6) est reliée de manière rotative au premier arbre de rotation (15), et
    une biellette (12) à une première extrémité de la biellette inférieure (6) bloque le support de roue auxiliaire (9) depuis le dessus ;
    le support de roue motrice (4) comprend un support principal (13) et un support vertical (14) fixé au-dessous du support principal (13), et
    une extrémité inférieure du support vertical (14) est reliée de manière pivotante à une deuxième extrémité de la biellette inférieure (6).
  3. Châssis de chariot élévateur à fourche à mât rétractable selon la revendication 1, dans lequel,
    le ressort de compression de roue auxiliaire (5) et le ressort de compression de roue motrice (1) sont respectivement prévus sur les deux côtés de la roue motrice (2).
  4. Châssis de chariot élévateur à fourche à mât rétractable selon l'une quelconque des revendications 1 à 3, dans lequel,
    le dispositif de verrouillage comprend un vérin hydraulique de verrouillage (8) et une électrovanne (11) prévue sur le vérin hydraulique de verrouillage (8) pour commander un passage d'huile du vérin hydraulique de verrouillage (8) ;
    l'électrovanne (11) est électriquement connectée à la borne de sortie du dispositif de commande (20), et l'électrovanne (11) commande corrélativement le verrouillage ou le flottement du vérin hydraulique de verrouillage (8) par la commande de l'état passantbloqué de l'électrovanne (11) ; et
    une extrémité du vérin hydraulique de verrouillage (8) est reliée à la première extrémité du support de roue auxiliaire (9), et une autre extrémité du vérin hydraulique de verrouillage (8) est configurée pour être reliée à la carrosserie de véhicule (30).
  5. Chariot élévateur à fourche à mât rétractable, comprenant le châssis de chariot élévateur à fourche à mât rétractable selon l'une quelconque des revendications 1 à 4 et une carrosserie de véhicule (30) reliée au châssis de chariot élévateur à fourche à mât rétractable.
  6. Chariot élévateur à fourche à mât rétractable selon la revendication 5, comprenant en outre un système hydraulique relié à la carrosserie de véhicule (30),
    dans lequel le système hydraulique comprend un passage hydraulique de levage de fourche correspondant à une fourche sur la carrosserie de véhicule (30), un dispositif de détection de pression (24) est relié au passage hydraulique de levage de fourche, et une borne de sortie du dispositif de détection de pression (24) est reliée à une borne d'entrée du dispositif de commande (20).
  7. Chariot élévateur à fourche à mât rétractable selon la revendication 5, comprenant en outre un portique (28) prévu sur la carrosserie de véhicule (30),
    le portique (28) est muni d'un dispositif de détection de hauteur (18) pour la détection d'une hauteur du portique (28), et
    une sortie du dispositif de détection de hauteur (18) est électriquement connectée à une entrée du dispositif de commande (20).
  8. Chariot élévateur à fourche à mât rétractable selon la revendication 5, comprenant en outre un portique (28) prévu sur la carrosserie de véhicule (30) et un levier de manoeuvre (25) prévu sur la carrosserie de véhicule (30) pour la commande d'un mouvement du portique (28),
    dans lequel le levier de manoeuvre (25) est muni d'un dispositif de détection de mouvement pour détecter si le levier de manoeuvre (25) est en mouvement, et
    une borne de sortie du dispositif de détection de mouvement est électriquement connectée à une borne d'entrée du dispositif de commande (20).
  9. Chariot élévateur à fourche à mât rétractable selon la revendication 8, dans lequel,
    le dispositif de détection de mouvement rend un commutateur de mouvement avant-arrière (21), un commutateur de levage (22) et un commutateur d'abaissement (23), chacun desquels est électriquement connecté au dispositif de commande (20).
  10. Chariot élévateur à fourche à mât rétractable selon la revendication 9, dans lequel,
    la carrosserie de véhicule (30) est reliée à une roue avant et à un volant,
    la roue avant et la roue motrice (2) sont reliées à un capteur de vitesse (19),
    le volant est relié à un capteur d'angle (26), et
    une borne de sortie du capteur de vitesse (19) et une borne de sortie du capteur d'angle (26) sont électriquement connectées à la borne d'entrée du dispositif de commande (20), respectivement.
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