Four-wheel steering transmission device for trackless rubber-tyred vehicle

Abstract

The invention belongs to the technical field of four-wheel steering, and particularly relates to a four-wheel steering transmission device for a trackless rubber-tyred vehicle, which comprises a frame, two ends of the frame are fixedly connected with a chassis, two sides of the upper end face of the chassis are rotatably provided with connecting rods II, and one end of each connecting rod II is provided with a wheel through a connecting shaft. A first connecting rod is rotatably arranged at one end of the second connecting rod, a rack plate is rotatably arranged at one end of the first connecting rod and slidably connected to the upper end face of the chassis through a sliding rail, and a first gear and a chain wheel are rotatably arranged on one side of the upper end face of the chassis. Lubricating oil flows out from the end of the oil outlet pipe through the lubricating assembly by regularly opening the electromagnetic valve, the lubricating oil can accurately drop to a to-be-lubricated area to lubricate a transmission part, and therefore the abrasion degree of the transmission part is reduced, the service life of the transmission part is prolonged, the transmission part does not need to be lubricated manually, and the working efficiency is improved. And the operation is convenient.

Description

Technical Field

[0001] The present invention belongs to the technical field of four-wheel steering, and specifically relates to a four-wheel steering transmission device for a trackless rubber-tyred vehicle. Background Art

[0002] A trackless rubber-tyred vehicle is a transportation tool specifically designed for complex environments such as mines and tunnels. It uses an explosion-proof diesel engine or an explosion-proof battery as power and runs on the roadway ground with rubber tyres. The four-wheel steering transmission device of a trackless rubber-tyred vehicle is an important part of the trackless rubber-tyred vehicle, and it is responsible for realizing the four-wheel steering function of the vehicle.

[0003] The patent document with the publication number CN207496771U discloses a four-wheel steering transmission device, which includes a power component and a transmission component; the power component includes a motor and a speed reducer connected to the motor; the transmission component includes a small sprocket fixedly connected to the speed reducer and four large sprockets fixedly connected to four steering wheel assemblies, and one of the large sprockets is a driven large sprocket, and the driven large sprocket is a double-row large sprocket; the small sprocket and the driven large sprocket are connected by a transmission chain Ⅰ, and the driven large sprocket and the other three large sprockets are connected by a transmission chain Ⅱ. This patent uses a single motor to drive the speed reducer, the small sprocket and the large sprocket to reduce speed, and by changing the local chain winding direction, it drives the double-row sprocket structure to control the four wheels to achieve lateral, longitudinal and in-situ spin motions. It can ensure that the four wheels rotate inward or outward simultaneously during steering, and solves the problem of non-synchronization of the four wheels during steering in the operation of a parking robot.

[0004] However, the above technical solution still has the following deficiencies in the actual application process: Since steering needs to be achieved through the transmission and cooperation of various components, and friction will be generated during the operation of the transmission components, long-term friction will cause wear of the transmission components, thereby affecting the service life of the components. When lubricating the transmission components manually, since the transmission components are usually relatively concealed, the entire lubrication operation is also relatively troublesome. Summary of the Invention

[0005] In order to make up for the deficiencies of the prior art and solve at least one technical problem proposed in the background art, the present invention proposes a four-wheel steering transmission device for a trackless rubber-tyred vehicle.

[0006] The technical solution adopted by the present invention to solve its technical problems is as follows: A four-wheel steering transmission device for a trackless rubber-tyred vehicle, including a vehicle frame, both ends of the vehicle frame are fixedly connected with a chassis, both sides of the upper end surface of the chassis are rotatably provided with a second connecting rod, one end of the second connecting rod is installed with a wheel through a connecting shaft, one end of the second connecting rod is rotatably provided with a first connecting rod, one end of the first connecting rod is rotatably provided with a rack plate, the rack plate is slidably connected to the upper end surface of the chassis through a slide rail, one side of the upper end surface of the chassis is rotatably provided with a first gear and a sprocket, the first gear meshes with the tooth blocks on the rack plate, both sprockets are meshed and connected with a chain, and a lubrication assembly for lubricating the rack plate, sprocket and first gear is further provided on the chassis; The lubrication assembly includes an oil storage cylinder fixedly connected to one side of the upper end surface of the chassis, an oil outlet pipe is communicated with one side of the oil storage cylinder, the end of the oil outlet pipe is aligned with the meshing part of the sprocket and the chain, and the meshing part of the first gear and the rack plate is aligned with the meshing part of the sprocket and the chain up and down.

[0007] Preferably, one of the sprockets is fixedly connected with a transmission shaft, and the other sprocket is fixedly connected with a driving shaft.

[0008] Preferably, a solenoid valve is arranged on one side of the oil outlet pipe.

[0009] Preferably, a lubrication auxiliary assembly is further arranged on the chassis; The lubrication auxiliary assembly includes a transmission rod rotatably arranged at one end of the inner cavity of the oil outlet pipe, and a spiral blade is sleeved and fixedly connected to the surface of the transmission rod.

[0010] Preferably, a first bevel gear is sleeved and fixedly connected to one side of the transmission rod, a second bevel gear and a second gear are rotatably arranged on one side of the oil outlet pipe, and the first bevel gear meshes with the second bevel gear.

[0011] Preferably, a support plate is fixedly connected to one side of the upper end surface of the rack plate, a rack rod is fixedly connected to one side of the upper end of the support plate, and the tooth blocks on the rack rod mesh with the second gear.

[0012] Preferably, a connecting column is fixedly connected to one side of the oil storage cylinder, and a receiving plate is fixedly connected to one end of the connecting column.

[0013] Preferably, a filter screen is arranged on the receiving plate, a scraping strip is slidably connected to one side of the receiving plate, the upper surface of the scraping strip is attached to the upper surface of the filter screen, sliding groove rods are fixedly connected to one side of the driving shaft and the transmission shaft, and a guiding column is fixedly connected to one side of the upper end of the scraping strip, and the guiding column is inserted into the sliding groove of the sliding groove rod and is slidably connected thereto.

[0014] Preferably, an oil filling port is arranged on one side of the upper end of the oil storage cylinder.

[0015] The beneficial effects of the present invention are as follows: 1. A four-wheel steering transmission device for a trackless rubber-tyred vehicle according to the present invention connects the driving shaft to the steering control member of the trackless rubber-tyred vehicle. When the driving shaft is driven by the steering control member to rotate within a certain angle range, the sprocket and gear on one side rotate. At the same time, under the action of the chain, the sprocket and gear on the other side rotate synchronously, and the gear drives the rack plate to slide horizontally on the slide rail. When the rack plate moves horizontally, it drives the first connecting rod to rotate, and then the second connecting rod drives the wheel to rotate, thus realizing four-wheel synchronous steering.

[0016] 2. A four-wheel steering transmission device for a trackless rubber-tyred vehicle according to the present invention utilizes a lubrication component. By regularly opening the solenoid valve, the lubricating oil flows out from the end of the oil outlet pipe, and the lubricating oil will accurately drip onto the area to be lubricated to lubricate the transmission components, thereby reducing the wear degree of the transmission components, being beneficial to improving the service life of the transmission components, and not requiring manual lubrication of the transmission components, which is relatively convenient.

[0017] 3. A four-wheel steering transmission device for a trackless rubber-tyred vehicle according to the present invention utilizes a lubrication auxiliary component. When the lumps fall from the end of the oil outlet pipe, they will fall onto the filter screen, and only the lubricating oil can pass through the filter screen to reach the meshing part of the components, thus avoiding the situation that harder lumps fall onto the meshing part of the transmission components, resulting in jamming of the transmission components and affecting the transmission efficiency. Moreover, during the wheel steering process, the driving shaft and the transmission shaft will also drive the chute rod to rotate, and the guide post moves in the chute of the chute rod, causing the scraping strip to move horizontally on the surface of the receiving plate. No matter which direction the scraping strip moves, the lumps on the filter screen will fall to the ground, thus avoiding the situation that the lumps accumulate too much on the filter screen and fall from the filter screen, affecting the transmission of the transmission components again. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention will be further described below with reference to the accompanying drawings.

[0019] Figure 1 is a three-dimensional structural schematic diagram of the present invention; Figure 2 is a three-dimensional structural schematic diagram at the chassis; Figure 1 ; Figure 3 is a three-dimensional structural schematic diagram at the chassis; Figure 2 ; Figure 4 is a three-dimensional structural schematic diagram at the receiving plate; Figure 5 is Figure 4 a partial enlarged view at A in Figure 6 is a three-dimensional structural schematic diagram at the support plate; Figure 7 is a three-dimensional structural schematic diagram at the first connecting rod; Figure 8Schematic diagram of the three-dimensional structure at the chassis Figure 3 .

[0020] In the figure: 1. Chassis; 2. Chain; 3. Oil storage cylinder; 4. First connecting rod; 5. Second connecting rod; 6. Sprocket; 7. Rack plate; 8. First gear; 9. Slide rail; 10. Oil outlet pipe; 11. Solenoid valve; 12. Support plate; 13. Rack rod; 14. Spiral blade; 15. Receiving plate; 16. Filter screen; 17. Scraping strip; 18. Guide post; 19. Slide groove rod; 20. Connecting shaft; 21. Second gear; 22. Transmission rod; 23. Oil filling port; 24. First bevel gear; 25. Second bevel gear; 26. Driving shaft; 27. Transmission shaft; 28. Wheel; 29. Connecting column; 30. Frame. Specific implementation mode

[0021] 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 only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0022] Please refer to Figures 1-8 , the present invention provides a technical solution: a four-wheel steering transmission device for a trackless rubber-tired vehicle, including a frame 30, both ends of the frame 30 are fixedly connected with a chassis 1, both sides of the upper end surface of the chassis 1 are rotatably provided with a second connecting rod 5, one end of the second connecting rod 5 is installed with a wheel 28 through a connecting shaft 20, one end of the second connecting rod 5 is rotatably provided with a first connecting rod 4, one end of the first connecting rod 4 is rotatably provided with a rack plate 7, the rack plate 7 is slidably connected to the upper end surface of the chassis 1 through a slide rail 9, one side of the upper end surface of the chassis 1 is rotatably provided with a first gear 8 and a sprocket 6, the first gear 8 meshes with the tooth blocks on the rack plate 7, both sprockets 6 on both sides are meshed and connected with a chain 2, and a lubrication assembly for lubricating the rack plate 7, sprocket 6, and first gear 8 is further provided on the chassis 1; The lubrication assembly includes an oil storage cylinder 3 fixedly connected to one side of the upper end surface of the chassis 1, one side of the oil storage cylinder 3 is communicated with an oil outlet pipe 10, the end of the oil outlet pipe 10 is aligned with the meshing part of the sprocket 6 and the chain 2, and the meshing part of the first gear 8 and the rack plate 7 is aligned with the meshing part of the sprocket 6 and the chain 2 up and down.

[0023] In this embodiment, as Figure 3 and Figure 8 shown, one sprocket 6 is fixedly connected with a transmission shaft 27, and the other sprocket 6 is fixedly connected with a driving shaft 26.

[0024] Specifically, the drive shaft 26 is connected to the steering control part of the trackless rubber-tyred vehicle. When the drive shaft 26 is driven by the steering control part to rotate within a certain angle range, the sprocket 6 and the first gear 8 on one side rotate. At the same time, under the action of the chain 2, the sprocket 6 and the first gear 8 on the other side rotate synchronously, and the first gear 8 drives the rack plate 7 to slide horizontally on the slide rail 9. When the rack plate 7 moves horizontally, it will drive the first connecting rod 4 to rotate, and then the second connecting rod 5 drives the wheel 28 to rotate, thus realizing four-wheel synchronous steering.

[0025] In this embodiment, as Figure 3 and Figure 4 shown, a solenoid valve 11 is arranged on one side of the oil outlet pipe 10.

[0026] Specifically, in the prior art, the four-wheel steering of the trackless rubber-tyred vehicle needs to be realized through the transmission and cooperation of various components. During the operation of the transmission components, friction will be generated. Long-term friction will cause wear of the transmission components, thus affecting the service life of the components. When manually lubricating the transmission components, since the transmission components are usually relatively hidden, the whole lubrication operation is also relatively troublesome. Therefore, to solve the above problems, when in use in this embodiment, when the oil storage cylinder 3 contains lubricating oil, the lubricating oil will flow into the oil outlet pipe 10 under the action of gravity. By regularly opening the solenoid valve 11, the lubricating oil flows out from the end of the oil outlet pipe 10. Since the end of the upper oil outlet pipe 10 is aligned with the meshing part of the sprocket 6 and the chain 2, the lubricating oil will accurately drip onto the meshing part for lubrication. Since the meshing part of the first gear 8 and the rack plate 7 is aligned with the meshing part of the sprocket 6 and the chain 2 up and down, the lubricating oil can fall onto the meshing part of the rack plate 7 and the first gear 8 under the action of gravity, also achieving the lubrication effect. And as the transmission components rotate, the lubricating oil can drip onto different positions of the transmission components, which is beneficial to improving the lubrication effect, thus reducing the wear degree of the transmission components, being beneficial to improving the service life of the transmission components, and not requiring manual lubrication of the transmission components, which is relatively convenient.

[0027] In this embodiment, as Figures 3-6 shown, a lubrication auxiliary component is also arranged on the chassis 1; The lubrication auxiliary component includes a transmission rod 22 rotatably arranged at one end of the inner cavity of the oil outlet pipe 10, and a spiral blade 14 is sleeved and fixedly connected to the surface of the transmission rod 22.

[0028] A first bevel gear 24 is sleeved and fixedly connected to one side of the transmission rod 22. A second bevel gear 25 and a second gear 21 are rotatably arranged on one side of the oil outlet pipe 10, and the first bevel gear 24 meshes with the second bevel gear 25.

[0029] One side of the upper end surface of the rack plate 7 is fixedly connected with a support plate 12, and one side of the upper end of the support plate 12 is fixedly connected with a rack rod 13. The tooth blocks on the rack rod 13 mesh with the second gear 21.

[0030] A connecting column 29 is fixedly connected to one side of the oil storage cylinder 3 , and a receiving plate 15 is fixedly connected to one end of the connecting column 29 .

[0031] A filter screen 16 is provided on the receiving plate 15, and a scraper strip 17 is slidably connected to one side of the receiving plate 15, and one side surface of the scraper strip 17 is in contact with the upper surface of the filter screen 16. A slide groove rod 19 is fixedly connected to one side of the driving shaft 26 and the transmission shaft 27, and a guide column 18 is fixedly connected to one side of the upper end of the scraper strip 17. The guide column 18 is inserted into the slide groove of the slide groove rod 19 and is slidably connected thereto.

[0032] Specifically, in the above embodiment, although the lubricating oil can be accurately dripped onto the meshing part of the transmission component to lubricate the transmission component, since the lubricating oil is discharged through the oil outlet pipe 10, the lubricating oil is likely to form residue on the inner wall of the oil outlet pipe 10, so that the lubricating oil may agglomerate in the inner cavity of the oil outlet pipe 10, affecting the subsequent discharge of the lubricating oil; Therefore, in order to solve the above problem, when the present embodiment is in use, during the steering process of the wheel 28, the rack plate 7 will move laterally on the slide rail 9, so the rack rod 13 will also move laterally and drive the gear 2 21 to rotate, so that the bevel gear 2 25 drives the bevel gear 1 24 to rotate. When the transmission rod 22 rotates, the spiral blades 14 on its surface will promote the movement of the lubricating oil block agglomerated in the inner cavity of the oil outlet pipe 10 due to the rotation, so that it falls from the end of the oil outlet pipe 10, thereby avoiding the situation that the lubricating oil remains and agglomerates on the inner wall of the oil outlet pipe 10, thereby affecting the subsequent discharge of the lubricating oil; In some cases, impurities such as metal particles will be mixed into the lubricating oil. When the impurities and the lubricating oil clump together, the hardness of this clump is usually relatively high. Moreover, the end of the oil outlet pipe 10 is aligned with the meshing part of the transmission components. Therefore, when the clump drops to the meshing part of the transmission components, it may cause the transmission components to jam and affect the transmission efficiency. Therefore, to solve this problem, when the clump drops through the end of the oil outlet pipe 10, it will drop onto the filter screen 16, and only the lubricating oil can pass through the filter screen 16 to reach the meshing part of the components, thus avoiding the situation where a relatively hard clump drops to the meshing part of the transmission components, causing the transmission components to jam and affecting the transmission efficiency. And although the filter screen 16 can block the clumps, when a certain number of clumps accumulate on the filter screen 16, the clumps will be in a piled-up state. Also, since the filter screen 16 is above the chain 2 and the sprocket 6, when the clumps drop from the receiving plate 15 due to accumulation, they will drop onto the meshing part of the chain 2 and the sprocket 6 again, resulting in the transmission effect of the chain 2 and the sprocket 6 being affected again. Therefore, to avoid this problem, during the steering process of the wheel 28, the driving shaft 26 and the transmission shaft 27 will also drive the chute rod 19 to rotate, and the guide post 18 moves at the chute of the chute rod 19, causing the scraping strip 17 to move horizontally on the surface of the receiving plate 15. No matter which direction the scraping strip 17 moves, the clumps on the filter screen 16 will drop to the ground, thus avoiding the situation where the transmission components are affected again due to excessive accumulation of clumps on the filter screen 16 and dropping from the filter screen 16.

[0033] In this embodiment, as Figure 3 shown, an oil filling port 23 is provided on one side of the upper end of the oil storage cylinder 3.

[0034] Specifically, the lubricating oil can be added to the oil storage cylinder 3 by using the oil filling port 23.

[0035] Working principle: Connect the driving shaft 26 to the steering control part of the trackless rubber-tyred vehicle. When the driving shaft 26 is driven by the steering control part to rotate within a certain angle range, the sprocket 6 and the first gear 8 on one side rotate. At the same time, under the action of the chain 2, the sprocket 6 and the first gear 8 on the other side rotate synchronously, and the first gear 8 drives the rack plate 7 to slide horizontally on the slide rail 9. When the rack plate 7 moves horizontally, it will drive the first connecting rod 4 to rotate, and then the second connecting rod 5 drives the wheel 28 to rotate, thus realizing four-wheel synchronous steering; The lubricating oil can be added into the oil storage cylinder 3 through the oil filling port 23. When there is lubricating oil in the oil storage cylinder 3, the lubricating oil will flow into the oil outlet pipe 10 under the action of gravity. By regularly opening the solenoid valve 11, the lubricating oil flows out from the end of the oil outlet pipe 10. Since the end of the upper oil outlet pipe 10 is aligned with the meshing part of the sprocket 6 and the chain 2, the lubricating oil will accurately drip onto the meshing part for lubrication. Since the meshing part of the first gear 8 and the rack plate 7 is aligned with the meshing part of the sprocket 6 and the chain 2 up and down, the lubricating oil can fall onto the meshing part of the rack plate 7 and the first gear 8 under the action of gravity, also achieving the lubrication effect. And as the transmission parts rotate, the lubricating oil can drip onto different positions of the transmission parts, which is beneficial to improving the lubrication effect, thereby reducing the wear degree of the transmission parts, being beneficial to improving the service life of the transmission parts, and there is no need for manual lubrication of the transmission parts, which is more convenient. During the steering process of the wheel 28, the rack plate 7 will move horizontally on the slide rail 9, so the rack rod 13 also moves horizontally and drives the second gear 21 to rotate, thus enabling the second bevel gear 25 to drive the first bevel gear 24 to rotate. When the transmission rod 22 rotates, the spiral blade 14 on its surface will promote the movement of the lubricating oil block agglomerated in the inner cavity of the oil outlet pipe 10 due to rotation, so that it falls from the end of the oil outlet pipe 10, thus avoiding the situation that the lubricating oil remains and agglomerates on the inner wall of the oil outlet pipe 10, which in turn affects the subsequent discharge of the lubricating oil; In some cases, impurities such as metal particles will be mixed into the lubricating oil. When the impurities and the lubricating oil form lumps simultaneously, the hardness of such lumps is usually relatively high. Moreover, the end of the outlet pipe 10 is aligned with the meshing part of the transmission components. Therefore, when the lumps fall onto the meshing part of the transmission components, it may cause the transmission components to jam, affecting the transmission efficiency. So, to solve this problem, when the lumps fall through the end of the outlet pipe 10, they will fall onto the filter screen 16, and only the lubricating oil can pass through the filter screen 16 to reach the meshing part of the components, thus avoiding the situation where relatively hard lumps fall onto the meshing part of the transmission components, causing the transmission components to jam and affecting the transmission efficiency. And although the filter screen 16 can block the lumps, when a certain number of lumps accumulate on the filter screen 16, the lumps will be in a piled-up state. Also, since the filter screen 16 is above the chain 2 and the sprocket 6, when the lumps fall from the receiving plate 15 due to accumulation, they will fall onto the meshing part of the chain 2 and the sprocket 6 again, resulting in the transmission effect of the chain 2 and the sprocket 6 being affected again. So, to avoid this problem, during the steering process of the wheel 28, the driving shaft 26 and the transmission shaft 27 will also drive the chute rod 19 to rotate, and the guide post 18 moves in the chute of the chute rod 19, causing the scraping strip 17 to move horizontally on the surface of the receiving plate 15. No matter which direction the scraping strip 17 moves in, the lumps on the filter screen 16 will fall to the ground, thus avoiding the situation where the lumps accumulate too much on the filter screen 16, fall off the filter screen 16, and affect the transmission of the transmission components again.

[0036] The above shows and describes the basic principles, main features, and advantages of the present invention. Those skilled in the art of this industry should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. A four-wheel steering transmission device for a trackless rubber-tyred vehicle, comprising a vehicle frame (30), characterized in that: Both ends of the frame (30) are fixedly connected to the chassis (1). On both sides of the upper end surface of the chassis (1), a second connecting rod (5) is rotatably arranged. One end of the second connecting rod (5) is provided with a wheel (28) through a connecting shaft (20). One end of the second connecting rod (5) is rotatably provided with a first connecting rod (4). One end of the first connecting rod (4) is rotatably provided with a rack plate (7). The rack plate (7) is slidably connected to the upper end surface of the chassis (1) through a slide rail (9). On one side of the upper end surface of the chassis (1), a first gear (8) and a sprocket (6) are rotatably arranged. The first gear (8) meshes with the teeth on the rack plate (7). Both sprockets (6) on both sides are meshed with a chain (2). A lubricating component for lubricating the rack plate (7), sprocket (6), and first gear (8) is also provided on the chassis (1); The lubricating component includes an oil storage cylinder (3) fixedly connected to one side of the upper end surface of the chassis (1). One side of the oil storage cylinder (3) is communicated with an oil outlet pipe (10). The end of the oil outlet pipe (10) is aligned with the meshing part of the sprocket (6) and the chain (2), and the meshing part of the first gear (8) and the rack plate (7) is aligned with the meshing part of the sprocket (6) and the chain (2) up and down.

2. The four-wheel steering transmission device for a trackless rubber-tyred vehicle according to claim 1, wherein: One side of the sprocket (6) is fixedly connected to a transmission shaft (27), and the other side of the sprocket (6) is fixedly connected to a driving shaft (26).

3. A four-wheel steering transmission device for a trackless rubber-tyred vehicle according to claim 1, characterized in that: A solenoid valve (11) is arranged on one side of the oil outlet pipe (10).

4. A four-wheel steering transmission device for a trackless rubber-tyred vehicle according to claim 1, characterized in that: A lubricating auxiliary component is also provided on the chassis (1); The lubricating auxiliary component includes a transmission rod (22) rotatably arranged at one end of the inner cavity of the oil outlet pipe (10). A spiral blade (14) is sleeved and fixedly connected to the surface of the transmission rod (22).

5. A four-wheel steering transmission device for a trackless rubber-tyred vehicle according to claim 4, characterized in that: One side of the transmission rod (22) is sleeved and fixedly connected to a first bevel gear (24). A second bevel gear (25) and a second gear (21) are rotatably arranged on one side of the oil outlet pipe (10). The first bevel gear (24) meshes with the second bevel gear (25).

6. The four-wheel steering transmission device for a trackless rubber-tyred vehicle according to claim 5, wherein: One side of the upper end surface of the rack plate (7) is fixedly connected to a support plate (12). One side of the upper end of the support plate (12) is fixedly connected to a rack rod (13). The teeth on the rack rod (13) mesh with the second gear (21).

7. A four-wheel steering transmission device for a trackless rubber-tyred vehicle according to claim 2, characterized in that: One side of the oil storage cylinder (3) is fixedly connected to a connecting column (29). One end of the connecting column (29) is fixedly connected to a receiving plate (15).

8. A four-wheel steering transmission device for a trackless rubber-tyred vehicle according to claim 7, characterized in that: A filter screen (16) is arranged on the receiving plate (15). A scraping strip (17) is slidably connected to one side of the receiving plate (15). The upper surface of the scraping strip (17) is attached to the upper surface of the filter screen (16). A chute rod (19) is fixedly connected to one side of both the driving shaft (26) and the transmission shaft (27). A guiding column (18) is fixedly connected to one side of the upper end of the scraping strip (17). The guiding column (18) is inserted into the chute of the chute rod (19) and is slidably connected thereto.

9. A four-wheel steering transmission device for a trackless rubber-tyred vehicle according to claim 1, characterized in that: An oil filling port (23) is arranged on one side of the upper end of the oil storage cylinder (3).

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