Wheel transmission device of road marking vehicle

Abstract

The invention relates to the technical field of transmission systems, in particular to a wheel transmission device of a road marking vehicle, which is used for solving the problem of poor effect of a transmission device of an existing marking vehicle. The device comprises a vehicle body, an advancing mechanism is arranged on the vehicle body and comprises moving wheels, gear rings are connected into the moving wheels, a transmission shaft is connected to the vehicle body, the end of the transmission shaft is fixedly connected with a sun gear and rotationally connected with a planet carrier, and planet gears meshed with the sun gear and the gear rings are rotationally connected to the planet carrier; when the marking vehicle is in a paint spraying state, the transmission shaft is unlocked on the planet carrier, so that the sun gear drives the moving wheel to rotate at a low speed through the planet gear and the gear ring, and when the marking vehicle is in a non-paint-spraying state, the transmission shaft is locked on the planet carrier, so that the transmission shaft drives the moving wheel to rotate at a high speed through the planet carrier; the device can adaptively adjust the advancing speed of the marking vehicle according to the paint spraying state.

Description

Technical Field

[0001] The present invention relates to the technical field of electric vehicle drive systems, belonging to F16H3*, and particularly relates to a wheel drive device for a road marking vehicle. Background Art

[0002] In the current field of road marking operations, electric vehicles are generally used. The design of the driving performance and functions of the vehicle used for road marking is directly related to the quality and operation efficiency of road marking. In the design of traditional marking vehicles, the wheel drive device is often relatively simple, lacking consideration for the wheel speed requirements in different operating states. This deficiency in design leads to the inability of the marking vehicle to effectively adjust the wheel speed when facing different operating states in practical applications, thus causing a series of problems.

[0003] Specifically, in the painting operation state, if the wheel speed is too high, it will seriously affect the uniformity and accuracy of the marking. Uneven marking not only affects the beauty and durability of the road, but may also cause traffic safety problems due to unclear markings. In the non-painting operation state, if the wheel speed is too low, it will reduce the driving speed of the marking vehicle, thus prolonging the operation time and reducing the overall work efficiency. This not only causes waste of resources, but may also affect the normal use of the road due to the long operation time. Summary of the Invention

[0004] The present invention provides a wheel drive device for a road marking vehicle to solve the problem of poor performance of the drive device of existing electric marking vehicles.

[0005] To alleviate the above technical problems, the technical solution provided by the present invention lies in:

[0006] A wheel drive device for a road marking vehicle, comprising a vehicle body, a traveling mechanism is arranged on the vehicle body, the traveling mechanism includes moving wheels, a tooth ring is connected inside the moving wheels, a transmission shaft is connected to the vehicle body, a sun gear is fixedly connected to the end of the transmission shaft, a planet carrier is rotatably connected, and planet gears meshing with the sun gear and the tooth ring are rotatably connected to the planet carrier;

[0007] When the marking vehicle is in the painting state, the transmission shaft is unlocked from the planet carrier, so that the sun gear drives the moving wheels to rotate at a low speed through the planet gears and the tooth ring, and when the marking vehicle is in the non-painting state, the transmission shaft is locked to the planet carrier, so that the transmission shaft drives the moving wheels to rotate at a high speed through the planet carrier.

[0008] Furthermore, there are two transmission shafts, and the two transmission shafts are coaxially arranged and commonly connected with a differential.

[0009] Furthermore, a drive shaft is rotatably connected to the vehicle body, the drive shaft is connected to the differential, a motor is fixedly connected to the bottom of the vehicle body, an output end of the motor is connected to a first bevel gear, a second bevel gear and a third bevel gear are key-slidably connected to the drive shaft, and when the marking vehicle is switched from the painting state to the non-painting state, the second bevel gear and the third bevel gear slide synchronously so that the second bevel gear or the third bevel gear meshes with the first bevel gear.

[0010] Furthermore, a first cylinder is fixedly connected to the vehicle body, an output end of the first cylinder is fixedly connected to a mounting bracket, the mounting bracket is slidably connected to the vehicle body, and the second bevel gear and the third bevel gear are symmetrically and rotatably connected to the mounting bracket.

[0011] Furthermore, a second cylinder is fixedly connected to the vehicle body, a protrusion is provided on the planet carrier, and when the first cylinder extends or contracts, the second cylinder extends or contracts synchronously to abut against the protrusion of the planet carrier, so that the planet carrier is locked to the vehicle body.

[0012] Furthermore, a snap ring is key-slidably connected to the transmission shaft, a swing frame is hinged to the vehicle body, long circular holes are formed in both the upper and lower sides of the swing frame, an output end of the second cylinder is fixedly connected to a first round rod, a rotating ring is rotatably connected to the snap ring, and a second round rod is fixedly connected to a side wall of the rotating ring, and the first round rod and the second round rod respectively slide in the long circular holes in the upper and lower parts of the swing frame;

[0013] When the second cylinder contracts, it can drive the swing frame to swing so that the snap ring is clamped to the planet carrier, so that the planet carrier is unlocked from the vehicle body.

[0014] Furthermore, a lubrication mechanism is further included, the lubrication mechanism includes a piston cylinder, a connecting column is rotatably connected to the middle of the moving wheel, a first oil pipe and a second oil pipe are fixedly connected to the connecting column, and both the first oil pipe and the second oil pipe are communicated with the internal space of the moving wheel;

[0015] The piston cylinder is communicated with the first oil pipe, and an oil box is communicated with an end of the second oil pipe.

[0016] Furthermore, a piston rod is slidably connected in the piston cylinder, a counterweight block is fixedly connected to an end of the piston rod, a baffle is fixedly connected to the vehicle body, and the baffle is used to limit the sliding stroke of the counterweight block;

[0017] When the transmission shaft is unlocked and locked to the planet carrier, the moving speed of the vehicle body increases or decreases rapidly, so that the piston rod slides in the piston cylinder.

[0018] Further, a ball is rotatably connected to the side wall of the piston rod, and the ball rolls on the vehicle body.

[0019] Further, a through hole is formed in the planet carrier, and the through hole communicates with the first oil pipe and the second oil pipe.

[0020] The beneficial effects of the present invention are analyzed as follows:

[0021] A wheel drive device for a road marking vehicle, including a vehicle body, a traveling mechanism is provided on the vehicle body, the traveling mechanism includes a moving wheel, a toothed ring is connected inside the moving wheel, a transmission shaft is connected to the vehicle body, a sun gear is fixedly connected to the end of the transmission shaft, and a planet carrier is rotatably connected. Planet gears meshing with the sun gear and the toothed ring are rotatably connected to the planet carrier; when the marking vehicle is in the painting state, the transmission shaft is unlocked from the planet carrier, so that the sun gear drives the moving wheel to rotate slowly through the planet gears and the toothed ring, and when the marking vehicle is in the non-painting state, the transmission shaft is locked to the planet carrier, so that the transmission shaft drives the moving wheel to rotate at high speed through the planet carrier.

[0022] When the road marking vehicle needs to perform road marking operations, that is, when it is in the painting state, the transmission shaft and the planet carrier are in the unlocked state. At this time, the sun gear serves as the input end, receives the driving force from the power source, and transmits the power to the toothed ring through the planet gears, thereby driving the moving wheel to rotate. Due to the deceleration effect of the planet gears, the moving wheel rotates at a lower speed, which is suitable for stable travel during marking operations. At the same time, the low-speed rotation helps to reduce splashing during painting and improve the quality of the road markings; in the non-painting state, that is, when the road marking vehicle needs to move quickly or change positions, the transmission shaft and the planet carrier are in the locked state. At this time, the transmission shaft serves as the direct driving source and drives the moving wheel to rotate at high speed through the planet carrier. Since the deceleration link of the planet gears is omitted, the moving wheel can rotate at a higher speed, thereby realizing the rapid movement of the road marking vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the related art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the related art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0024] Figure 1 is a schematic diagram of the overall structure of the present invention;

[0025] Figure 2 is a schematic diagram of the structure at the differential of the present invention;

[0026] Figure 3 is a schematic diagram of the structure at the first cylinder of the present invention;

[0027] Figure 4 It is a schematic structural diagram of the second cylinder of the present invention;

[0028] Figure 5 It is a schematic structural diagram of the swing frame of the present invention;

[0029] Figure 6 It is a schematic structural diagram of the piston cylinder of the present invention.

[0030] Icon:

[0031] 100, vehicle body; 110, body; 120, camera; 200, painting mechanism; 210, bracket; 220, hydraulic rod; 230, base; 240, paint can; 250, top seat; 260, pressure-sensitive switch; 300, traveling mechanism; 310, differential; 320, transmission shaft; 321, swivel ring; 322, second round rod; 323, snap ring; 330, moving wheel; 340, gear ring; 350, planet carrier; 360, planet gear; 400, commutation mechanism; 410, motor; 420, first bevel gear; 430, second bevel gear; 440, third bevel gear; 450, drive shaft; 460, mounting bracket; 470, first cylinder; 480, second cylinder; 481, first round rod; 490, swing frame; 500, lubrication mechanism; 510, piston cylinder; 520, piston rod; 521, counterweight; 522, baffle; 523, ball; 530, oil box; 540, first oil pipe; 550, second oil pipe; 560, connecting column; 570, through hole. Detailed implementation manners

[0032] Next, the technical solutions of the present invention will be clearly and completely described in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of them. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts belong to the scope of protection of the present invention.

[0033] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation to the present invention. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0034] In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0035] An embodiment is as follows Figures 1-6 As shown, a wheel drive device of a road marking vehicle includes a vehicle body 100. A traveling mechanism 300 is provided on the vehicle body 100. The traveling mechanism 300 includes a moving wheel 330. A tooth ring 340 is connected inside the moving wheel 330. A transmission shaft 320 is connected to the vehicle body 100. A sun gear is fixedly connected to the end of the transmission shaft 320, and a planet carrier 350 is rotatably connected. A planet gear 360 that meshes with the sun gear and the tooth ring 340 is rotatably connected to the planet carrier 350; when the marking vehicle is in the painting state, the transmission shaft 320 is unlocked from the planet carrier 350, so that the sun gear drives the moving wheel 330 to rotate at a low speed through the planet gear 360 and the tooth ring 340, and when the marking vehicle is in the non-painting state, the transmission shaft 320 is locked to the planet carrier 350, so that the transmission shaft 320 drives the moving wheel 330 to rotate at a high speed through the planet carrier 350.

[0036] The working mechanism of the drive device provided by this embodiment:

[0037] When the road marking vehicle needs to perform road marking operations, that is, when it is in the painting state, the transmission shaft 320 and the planet carrier 350 are in the unlocked state. At this time, the sun gear serves as the input end, receives the driving force from the power source, and transmits the power to the tooth ring 340 through the planet gear 360, thereby driving the moving wheel 330 to rotate. Due to the speed reduction effect of the planet gear 360, the moving wheel 330 rotates at a relatively low speed, which is suitable for stable travel during marking operations. At the same time, the low-speed rotation helps to reduce splashing during painting and improve the marking quality; in the non-painting state, that is, when the marking vehicle needs to move quickly or change positions, the transmission shaft 320 and the planet carrier 350 are in the locked state. At this time, the transmission shaft 320 serves as the direct drive source and drives the moving wheel 330 to rotate at a high speed through the planet carrier 350. Since the speed reduction link of the planet gear 360 is omitted, the moving wheel 330 can rotate at a relatively high speed, thereby realizing the rapid movement of the marking vehicle.

[0038] In an optional manner of this embodiment, a more preferred one is:

[0039] There are two transmission shafts 320, and the two transmission shafts 320 are coaxially arranged and commonly connected with a differential 310.

[0040] The settings of the drive shaft 320 and the differential 310 ensure the stability of the marking vehicle during straight driving and also improve its adaptability under complex road conditions. Especially during the turning process, the differential 310 can automatically adjust the rotational speeds of the two drive shafts 320 on both sides to ensure that the moving wheels 330 maintain good grip on the ground, effectively preventing out-of-control situations caused by tire slippage.

[0041] Regarding the structure of the reversing mechanism 400, specifically:

[0042] A drive shaft 450 is rotatably connected to the vehicle body 100. The drive shaft 450 is connected to the differential 310. A motor 410 is fixedly connected to the bottom of the vehicle body 100. The output end of the motor 410 is connected to a first bevel gear 420. A second bevel gear 430 and a third bevel gear 440 are key-slidably connected to the drive shaft 450. When the marking vehicle switches from the painting state to the non-painting state, the second bevel gear 430 and the third bevel gear 440 slide synchronously so that the second bevel gear 430 or the third bevel gear 440 meshes with the first bevel gear 420.

[0043] When the marking vehicle is in the painting state, the motor 410 drives the first bevel gear 420 to rotate. The first bevel gear 420 drives the second bevel gear 430 or the third bevel gear 440 that meshes with it to rotate, and then drives the drive shaft 450 and the differential 310 to rotate. The differential 310 then transmits the power to the two drive shafts 320. At this time, since the drive shaft 320 is unlocked from the planet carrier 350, the sun gear receives the power and is transmitted to the ring gear 340 after being decelerated by the planet gears 360, and finally drives the moving wheels 330 to rotate at a low speed. In the non-painting state, by adjusting the positions of the second bevel gear 430 and the third bevel gear 440, another bevel gear is made to mesh with the first bevel gear 420. At this time, the power of the motor 410 is directly transmitted to the moving wheels 330 through the differential 310, the drive shaft 320, and the planet carrier 350. Since the deceleration effect of the planet gears 360 is omitted, the moving wheels 330 can rotate at a higher speed to achieve the rapid movement of the marking vehicle. And during this process, the rotation direction of the first bevel gear 420 always remains unchanged, while the second bevel gear 430 and the third bevel gear 440 are horizontally opposed. Therefore, after switching the meshing state between the first bevel gear 420 and the second bevel gear 430 and the third bevel gear 440, the rotation direction of the drive shaft 450 can be changed, thus ensuring the maintenance of the moving direction of the moving wheels 330 and enabling the marking vehicle to be adapted to draw dotted lines on the road surface.

[0044] In an optional manner of this embodiment, preferably:

[0045] A first cylinder 470 is fixedly connected to the vehicle body 100. The output end of the first cylinder 470 is fixedly connected to a mounting bracket 460. The mounting bracket 460 is slidably connected to the vehicle body 100. The second bevel gear 430 and the third bevel gear 440 are symmetrically and rotatably connected to the mounting bracket 460.

[0046] The first cylinder 470 is fixedly connected to the vehicle body 100. When the first cylinder 470 expands and contracts, it can drive the mounting bracket 460 to slide, so that the second bevel gear 430 and the third bevel gear 440 rotatably connected to the mounting bracket 460 can move to switch the meshing state with the first bevel gear 420.

[0047] In an alternative embodiment of the present example, preferably:

[0048] A second cylinder 480 is fixedly connected to the vehicle body 100. A protrusion is provided on the planet carrier 350. When the first cylinder 470 extends or contracts, the second cylinder 480 extends or contracts synchronously to abut against the protrusion of the planet carrier 350, so that the planet carrier 350 is locked to the vehicle body 100.

[0049] When the control system detects the expansion and contraction of the first cylinder 470, it will control the second cylinder 480 to expand and contract synchronously. When the second cylinder 480 extends, its output end can abut against the protrusion on the planet carrier 350, thereby preventing the rotation of the planet carrier 350. At this time, the transmission shaft 320 rotates on the planet carrier 350 and drives the planet gear 360 to rotate, and the planet gear 360 then drives the moving wheel 330 to move slowly.

[0050] In an alternative embodiment of the present example, preferably:

[0051] A snap ring 323 is key-slidably connected to the transmission shaft 320. A swing frame 490 is hinged to the vehicle body 100. Long circular holes are provided on both the upper and lower sides of the swing frame 490. The output end of the second cylinder 480 is fixedly connected to a first round rod 481. A rotating ring 321 is rotatably connected to the snap ring 323. A second round rod 322 is fixedly connected to the side wall of the rotating ring 321. The first round rod 481 and the second round rod 322 respectively slide in the long circular holes on the upper and lower parts of the swing frame 490. When the second cylinder 480 contracts, it can drive the swing frame 490 to swing, so that the snap ring 323 is clamped to the planet carrier 350, thereby unlocking the planet carrier 350 from the vehicle body 100.

[0052] When the second cylinder 480 shortens, its output end drives the first round rod 481 away from the planet carrier 350. The first round rod 481 slides in the long circular hole and drives the swing frame 490 to swing around the hinge point. At this time, the second cylinder 480 no longer blocks the protrusion on the planet carrier 350. At the same time, the swing frame 490 drives the second round rod 322 to slide towards the planet carrier 350. At this time, the second round rod 322 slides in the long circular hole at the lower part of the swing frame 490, so that the snap ring 323 is clamped to the planet carrier 350. At this time, the planet carrier 350 can rotate relative to the vehicle body 100. Then, the transmission shaft 320 directly drives the planet carrier 350 to rotate through the snap ring 323, thereby increasing the rotation speed of the moving wheel 330 and accelerating the moving speed of the vehicle body 100.

[0053] Regarding the structure of the lubrication mechanism 500, specifically:

[0054] The lubrication mechanism 500 includes a piston cylinder 510. A connecting column 560 is rotatably connected to the middle of the moving wheel 330. A first oil pipe 540 and a second oil pipe 550 are fixedly connected to the connecting column 560. Both the first oil pipe 540 and the second oil pipe 550 are communicated with the internal space of the moving wheel 330. The piston cylinder 510 is communicated with the first oil pipe 540, and the end of the second oil pipe 550 is communicated with an oil box 530.

[0055] The piston cylinder 510 can apply positive pressure or negative pressure to the space inside the moving wheel 330, so that the lubricating oil can flow inside the moving wheel 330 and in the oil box 530, making the lubricating oil for lubricating the internal gears of the moving wheel 330 in a flowing state. At the same time, a filter screen is arranged in the oil box 530, so that sundries such as metal chips in the flowing lubricating oil can be separated.

[0056] In an alternative embodiment of the present embodiment, preferably:

[0057] A piston rod 520 is slidably connected in the piston cylinder 510. A counterweight 521 is fixedly connected to the end of the piston rod 520. A baffle 522 is fixedly connected to the vehicle body 100. The baffle 522 is used to limit the sliding stroke of the counterweight 521. When the transmission shaft 320 is unlocked and locked to the planet carrier 350, the moving speed of the vehicle body 100 increases or decreases rapidly, so that the piston rod 520 slides in the piston cylinder 510.

[0058] A counterweight 521 is arranged at the end of the piston rod 520. The counterweight 521 has a large mass and thus a large inertia. When the marking vehicle switches between the painting state and the non-painting state, its moving speed changes greatly. When the moving speed of the marking vehicle changes greatly, due to the inertial effect of the counterweight 521, the piston rod 520 will be driven to slide in the piston cylinder 510, thereby making the lubricating oil in the moving wheel 330 flow and filter.

[0059] In an alternative embodiment of the present embodiment, preferably:

[0060] A ball 523 is rotatably connected to the side wall of the piston rod 520, and the ball 523 rolls on the vehicle body 100.

[0061] The arrangement of the ball 523 reduces the friction between the piston rod 520 and the vehicle body 100, making the movement of the piston rod 520 smoother and improving the lubrication efficiency.

[0062] In an alternative embodiment of the present invention, preferably:

[0063] A through hole 570 is formed in the planet carrier 350, and the through hole 570 communicates with the first oil pipe 540 and the second oil pipe 550.

[0064] The arrangement of the through hole 570 enables the first oil pipe 540 and the second oil pipe 550 to communicate with the space inside the planet carrier 350, facilitating the circulation and recycling of the lubricating oil.

[0065] Regarding the structure of the vehicle body 100 and the painting mechanism 200, specifically:

[0066] The vehicle body 100 includes a body 110, on which a camera 120 is provided. After the camera 120 captures an image, the image is transmitted to a control system, which adjusts the traveling route or the painting operation state of the marking vehicle according to the captured image information to achieve intelligent road marking operations. A painting mechanism 200 is also provided on the body 110. The painting mechanism 200 includes a paint can 240. A bracket 210 is fixedly connected to the body 110, a hydraulic rod 220 is fixedly connected to the bracket 210, a base 230 is fixedly connected to the output end of the hydraulic rod 220, a top seat 250 is fixedly connected to the cylinder block of the hydraulic rod 220, the paint can 240 is located between the top seat 250 and the base 230, the paint can 240 stores the paint required for marking, a pressure-sensitive switch 260 is provided on the top seat 250, and the control system controls the hydraulic rod 220 to shorten to perform the painting operation. At this time, the paint can 240 presses the pressure-sensitive switch 260, so that the pressure-sensitive switch 260 controls the first cylinder 470 to extend or shorten.

[0067] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A wheel transmission device for a road marking vehicle, characterized in that: The vehicle comprises a vehicle body (100), wherein a travel mechanism (300) is arranged on the vehicle body (100), wherein the travel mechanism (300) comprises a moving wheel (330), wherein a gear ring (340) is connected to the moving wheel (330), wherein a transmission shaft (320) is connected to the vehicle body (100), wherein an end of the transmission shaft (320) is fixedly connected to a sun gear and rotatably connected to a planet carrier (350), and wherein a planet gear (360) meshing with the sun gear and the gear ring (340) is rotatably connected to the planet carrier (350); When the road marking vehicle is in a painting state, the transmission shaft (320) is unlocked from the planetary carrier (350), so that the sun gear drives the moving wheel (330) to rotate at a low speed through the planetary gear (360) and the ring gear (340); and when the road marking vehicle is in a non-painting state, the transmission shaft (320) is locked to the planetary carrier (350), so that the transmission shaft (320) drives the moving wheel (330) to rotate at a high speed through the planetary carrier (350).

2. The wheel transmission device of the road marking vehicle according to claim 1, characterized in that: There are two transmission shafts (320), and the two transmission shafts (320) are coaxially arranged and commonly connected to a differential (310).

3. The wheel transmission device of the road marking vehicle according to claim 2, characterized in that: A drive shaft (450) is rotatably connected to the vehicle body (100), and the drive shaft (450) is connected to the differential (310). A motor (410) is fixedly connected to the bottom of the vehicle body (100), and an output end of the motor (410) is connected to a first bevel gear (420). A second bevel gear (430) and a third bevel gear (440) are slidably connected to the drive shaft (450) by a key. When the road marking vehicle switches from a painting state to a non-painting state, the second bevel gear (430) and the third bevel gear (440) slide synchronously, so that the second bevel gear (430) or the third bevel gear (440) is meshed with the first bevel gear (420).

4. The wheel transmission device of the road marking vehicle according to claim 3, characterized in that: The vehicle body (100) is fixedly connected to a first cylinder (470), an output end of the first cylinder (470) is fixedly connected to a mounting frame (460), the mounting frame (460) is slidably connected to the vehicle body (100), and the second bevel gear (430) and the third bevel gear (440) are symmetrically rotatably connected to the mounting frame (460).

5. The wheel transmission device of the road marking vehicle according to claim 4, characterized in that: The vehicle body (100) is fixedly connected with a second cylinder (480), and the planet carrier (350) is provided with a protrusion. When the first cylinder (470) is extended or shortened, the second cylinder (480) is synchronously extended or shortened to abut against the protrusion of the planet carrier (350), so that the planet carrier (350) is locked to the vehicle body (100).

6. The wheel transmission device of the road marking vehicle according to claim 5, characterized in that: A snap ring (323) is slidably connected to a key on the transmission shaft (320); a swing frame (490) is hingedly connected to the vehicle body (100); oblong holes are provided on the upper and lower sides of the swing frame (490); a first round rod (481) is fixedly connected to the output end of the second cylinder (480); a swivel ring (321) is rotatably connected to the snap ring (323); a second round rod (322) is fixedly connected to the side wall of the swivel ring (321); the first round rod (481) and the second round rod (322) slide in the oblong holes on the upper and lower parts of the swing frame (490) respectively; When the second cylinder (480) is shortened, it can drive the swing frame (490) to swing, so that the clamping ring (323) is clamped to the planetary frame (350), thereby unlocking the planetary frame (350) from the vehicle body (100).

7. The wheel transmission device of a road marking vehicle according to claim 6, characterized in that: It also includes a lubrication mechanism (500), the lubrication mechanism (500) includes a piston cylinder (510), a connecting column (560) is rotatably connected to the middle of the moving wheel (330), a first oil pipe (540) and a second oil pipe (550) are fixedly connected to the connecting column (560), and the first oil pipe (540) and the second oil pipe (550) are both in communication with the internal space of the moving wheel (330); The piston cylinder (510) is in communication with the first oil pipe (540), and the end of the second oil pipe (550) is in communication with an oil box (530).

8. The wheel transmission device of a road marking vehicle according to claim 7, characterized in that: A piston rod (520) is slidably connected inside the piston cylinder (510), a counterweight (521) is fixedly connected to the end of the piston rod (520), and a baffle (522) is fixedly connected to the vehicle body (100), and the baffle (522) is used to limit the sliding stroke of the counterweight (521); When the transmission shaft (320) is unlocked and locked to the planet carrier (350), the moving speed of the vehicle body (100) is rapidly increased or decreased, so that the piston rod (520) slides on the piston cylinder (510).

9. The wheel transmission device of a road marking vehicle according to claim 8, characterized in that: A ball (523) is rollingly connected to the side wall of the piston rod (520), and the ball (523) rolls on the vehicle body (100).

10. The wheel transmission device of a road marking vehicle according to claim 9, characterized in that: The planet carrier (350) is provided with a through hole (570), and the through hole (570) is connected to the first oil pipe (540) and the second oil pipe (550).

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