Steering system of three-wheel drive tractor and tractor

Abstract

The utility model provides a steering system of a three-wheel drive tractor and the tractor. A steering system of a three-wheel drive tractor comprises a bracket, a front connecting fork, a left steering oil cylinder, a right steering oil cylinder and a rotating bearing disc, the front connecting fork is connected with the rotating bearing disc, and the rotating bearing disc is installed on the bracket. One end of the left steering oil cylinder and one end of the right steering oil cylinder are both hinged to the rotating bearing disc, and the other end of the left steering oil cylinder and the other end of the right steering oil cylinder are both hinged to the bracket.

Description

Technical Field

[0001] The utility model relates to the technical field of vehicle steering, in particular to a steering system of a three-wheel drive tractor and the tractor. Background Art

[0002] A tractor is a heavy machine used to pull and propel agricultural implements in agricultural production. It is widely used in various applications, including tillage, planting, harvesting, and transportation. Its versatility enables farmers to complete various agricultural activities more efficiently, making it an indispensable tool in the process of agricultural modernization. Four-wheel drive tractors are the most common type for greater traction. However, in specialized work environments, such as small field plots and cotton cultivation, four-wheel drive tractors have a large turning radius and complex wheelbase adjustment, significantly reducing their efficiency.

[0003] Existing four-wheel drive tractors mostly feature front-wheel steering systems. A centrally mounted through-the-axle oil cylinder is externally mounted at the center of the front drive axle. When the steering wheel is turned left or right, oil from the steering pump enters the hydraulic steering gear. The oil from the hydraulic steering gear then propels the left and right steering linkages through the centrally mounted through-the-axle oil cylinder, rotating the front wheels and turning the tractor left and right. Limited by factors such as tire size, wheelbase, and hood, existing four-wheel drive steering tractors typically have a large turning radius, making them awkward when turning at the end of a field. In other agricultural applications, such as those with a wide variety of row spacings, wheelbase adjustment requires adjusting both the front and rear wheel tracks simultaneously, making adjustments complex.

[0004] In the existing technical solutions, since all four-wheel drive tractors are equipped with front-wheel drive axles, each side of the front-wheel drive axle has a drive tire, the cost is relatively high, and the steering is not flexible in small-plot work sites. Utility Model Content

[0005] The technical problem to be solved by the utility model is to provide a steering system of a three-wheel drive tractor and a tractor in view of the deficiencies in the prior art.

[0006] The technical solution of the utility model for solving the above technical problems is as follows: A steering system of a three-wheel drive tractor, comprising: a bracket, a front connecting fork, a left steering cylinder, a right steering cylinder, and a rotating bearing plate, wherein the front connecting fork is connected to the rotating bearing plate, and the rotating bearing plate is mounted on the bracket, one end of the left steering cylinder and one end of the right steering cylinder are both hinged to the rotating bearing plate, and the other end of the left steering cylinder and the other end of the right steering cylinder are both hinged to the bracket.

[0007] The beneficial effects of the technical solution of this utility model are as follows: by installing two double-acting piston rods on the upper portion of the bracket's rotating bearing disc, the rotating bearing disc is driven to rotate. When the rotating bearing disc rotates, the front connecting fork is driven to rotate, thereby driving the front wheel to rotate left and right. This changes the front wheel steering from two wheels to one wheel, thus reducing the tractor's turning radius and making it more flexible. In workplaces where wheelbase adjustment is required, it can be achieved by simply adjusting the rear wheel track. The front drive axle is replaced by a steering cylinder, and the front wheel tire is reduced from two to one, thus reducing the overall cost of the tractor.

[0008] Furthermore, the left steering cylinder and the right steering cylinder are both connected to a hydraulic steering gear, and the hydraulic steering gear is connected to a steering wheel via a spline shaft.

[0009] The beneficial effect of adopting the above-mentioned further technical solution is as follows: by installing two double-acting piston rods on the upper part of the bracket rotating bearing disk, when the steering wheel is turned, the pressure oil enters the rod chamber and rodless chamber of the left and right steering cylinders through the hydraulic steering gear, thereby driving the rotating bearing disk to rotate. When the rotating bearing disk rotates, it drives the front connecting fork to rotate, thereby driving the front wheel to rotate, realizing the front wheel turning left and right. In this way, the front wheel steering is changed from two-wheel steering to single-wheel steering, which makes the tractor's turning radius smaller and the steering more flexible. In the workplace where wheelbase adjustment is required, it can be achieved by simply adjusting the rear wheel track, and the front drive axle is replaced by the steering cylinder. The front wheel tire is changed from two to one, which makes the cost of the entire tractor lower.

[0010] Furthermore, the hydraulic steering gear is connected to a steering pump, the steering pump is connected to a steering oil tank; and the steering pump is connected to an engine.

[0011] The beneficial effect of adopting the above further technical solution is that the steering oil tank can store oil. The steering pump is connected to the engine through a spline shaft. When the engine is running, it drives the steering pump to rotate and converts mechanical energy into hydraulic energy.

[0012] Furthermore, the steering oil tank is connected to the hydraulic steering gear through a steering gear return oil pipe, and the steering oil tank is connected to the steering pump through a steering pump oil inlet pipe; the steering pump is connected to the hydraulic steering gear through a steering gear oil inlet pipe.

[0013] The beneficial effect of adopting the above-mentioned further technical solution is that the arrangement of the steering gear oil return pipe, the steering pump oil inlet pipe and the steering gear oil inlet pipe makes it easier for the steering oil tank to supply oil to the steering pump and for the hydraulic steering gear to return oil to the steering oil tank.

[0014] Furthermore, the hydraulic steering gear is connected to a left steering gear oil outlet pipe and a right steering gear oil outlet pipe, the left steering gear oil outlet pipe is connected to a left steering cylinder oil pipe, and the left steering cylinder oil pipe is respectively connected to the rodless cavity of the left steering cylinder and the rod cavity of the right steering cylinder; the right steering gear oil outlet pipe is connected to a right steering cylinder oil pipe, and the right steering cylinder oil pipe is respectively connected to the rod cavity of the left steering cylinder and the rodless cavity of the right steering cylinder.

[0015] The beneficial effects of adopting this further technical solution include: the arrangement of the left steering gear oil outlet pipe, the steering gear oil outlet pipe, the left steering cylinder oil pipe, and the right steering cylinder oil pipe facilitates the hydraulic steering gear to control the extension and retraction of the left and right steering cylinders via hydraulic oil. Individual front wheel steering is achieved by simultaneously injecting oil into the left and right steering cylinders on the upper portion of the bracket, driving the rotating bearing disk to rotate. This simultaneous injection of oil into the left and right steering cylinders to drive the rotating bearing disk reduces the size of the steering cylinders and reduces costs.

[0016] Furthermore, the hydraulic steering gear is provided with a P port, a T port, an L port and an R port, the steering gear oil inlet pipe is connected to the P port of the hydraulic steering gear, the steering gear oil return pipe is connected to the T port of the hydraulic steering gear, the left steering gear oil outlet pipe is connected to the L port of the hydraulic steering gear, and the right steering gear oil outlet pipe is connected to the R port of the hydraulic steering gear.

[0017] The beneficial effect of adopting the above-mentioned further technical solution is that the design of the connection relationship between each interface of the hydraulic steering device and the pipeline facilitates the installation and maintenance of the pipeline.

[0018] Furthermore, the upper part of the front connecting fork is connected to the lower part of the rotating bearing disc by bolts, the lower part of the rotating bearing disc is mounted on the bracket by bolts, the lower part of the front connecting fork is connected to the wheel hub, and the wheel hub is mounted with a tire.

[0019] The beneficial effect of adopting the above-mentioned further technical solution is that the detachable connection through bolts facilitates the installation and maintenance of the front connecting fork, the rotating bearing plate and the bracket.

[0020] Furthermore, one end of the left steering cylinder and one end of the right steering cylinder are hinged to the rotating bearing disk through a connecting pin, and the other end of the left steering cylinder and the other end of the right steering cylinder are hinged to the bracket through a connecting pin.

[0021] The beneficial effect of adopting the above-mentioned further technical solution is that the piston rod ends of the left and right steering cylinders are fixed to the rotating bearing plate via connecting pins, and the other piston ends of the left and right steering cylinders are fixed to the upper part of the bracket via connecting pins. This facilitates the left and right steering cylinders to drive the rotating bearing plate to rotate and prevents the left and right steering cylinders from getting stuck.

[0022] Furthermore, a limit block is installed on the bracket.

[0023] The beneficial effect of adopting the above-mentioned further technical solution is that the limit block plays a role in limiting the left steering cylinder and the right steering cylinder.

[0024] In addition, the present invention also provides a tractor comprising the steering system of any one of the three-wheel drive tractors described above.

[0025] The beneficial effects of the technical solution of this utility model are as follows: by installing two double-acting piston rods on the upper portion of the bracket's rotating bearing disc, the rotating bearing disc is driven to rotate. When the rotating bearing disc rotates, the front connecting fork is driven to rotate, thereby driving the front wheel to rotate left and right. This changes the front wheel steering from two wheels to one wheel, thus reducing the tractor's turning radius and making it more flexible. In workplaces where wheelbase adjustment is required, it can be achieved by simply adjusting the rear wheel track. The front drive axle is replaced by a steering cylinder, and the front wheel tire is reduced from two to one, thus reducing the overall cost of the tractor.

[0026] Advantages of additional aspects of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be understood through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is one of the structural schematic diagrams of the steering system of a three-wheel drive tractor provided in an embodiment of the utility model.

[0028] Figure 2 This is a second structural schematic diagram of the steering system of a three-wheel drive tractor provided in an embodiment of the present utility model.

[0029] Figure 3 This is a third structural schematic diagram of the steering system of a three-wheel drive tractor provided in an embodiment of the present utility model.

[0030] Explanation of the accompanying figures: 1. Steering wheel; 2. Spline shaft; 3. Hydraulic steering gear; 4. Steering gear oil inlet pipe; 5. Steering gear oil return pipe; 6. Steering pump oil inlet pipe; 7. Steering oil tank; 8. Steering pump; 9. Bracket; 10. Front connecting fork; 11. Tire; 12. Wheel hub; 13. Left steering gear oil outlet pipe; 14. Right steering gear oil outlet pipe; 15. Left steering cylinder oil pipe; 16. Left steering cylinder; 17. Right steering cylinder; 18. Right steering cylinder oil pipe; 19. Limit block; 20. Rotating bearing plate. DETAILED DESCRIPTION

[0031] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The embodiments given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0032] like Figures 1 to 3 As shown, an embodiment of the utility model provides a steering system for a three-wheel drive tractor, comprising: a bracket 9, a front connecting fork 10, a left steering cylinder 16, a right steering cylinder 17, and a rotating bearing disc 20, wherein the front connecting fork 10 is connected to the rotating bearing disc 20, and the rotating bearing disc 20 is mounted on the bracket 9, one end of the left steering cylinder 16 and one end of the right steering cylinder 17 are both hinged to the rotating bearing disc 20, and the other end of the left steering cylinder 16 and the other end of the right steering cylinder 17 are both hinged to the bracket 9.

[0033] The beneficial effects of the technical solution of this utility model are as follows: by installing two double-acting piston rods on the upper portion of the bracket's rotating bearing disc, the rotating bearing disc is driven to rotate. When the rotating bearing disc rotates, the front connecting fork is driven to rotate, thereby driving the front wheel to rotate left and right. This changes the front wheel steering from two wheels to one wheel, thus reducing the tractor's turning radius and making it more flexible. In workplaces where wheelbase adjustment is required, it can be achieved by simply adjusting the rear wheel track. The front drive axle is replaced by a steering cylinder, and the front wheel tire is reduced from two to one, thus reducing the overall cost of the tractor.

[0034] like Figures 1 to 3 As shown, further, the left steering cylinder 16 and the right steering cylinder 17 are both connected to a hydraulic steering gear 3 , and the hydraulic steering gear 3 is connected to a steering wheel 1 through a spline shaft 2 .

[0035] The beneficial effect of adopting the above-mentioned further technical solution is as follows: by installing two double-acting piston rods on the upper part of the bracket rotating bearing disk, when the steering wheel is turned, the pressure oil enters the rod chamber and rodless chamber of the left and right steering cylinders through the hydraulic steering gear, thereby driving the rotating bearing disk to rotate. When the rotating bearing disk rotates, it drives the front connecting fork to rotate, thereby driving the front wheel to rotate, realizing the front wheel turning left and right. In this way, the front wheel steering is changed from two-wheel steering to single-wheel steering, which makes the tractor's turning radius smaller and the steering more flexible. In the workplace where wheelbase adjustment is required, it can be achieved by simply adjusting the rear wheel track, and the front drive axle is replaced by the steering cylinder. The front wheel tire is changed from two to one, which makes the cost of the entire tractor lower.

[0036] like Figures 1 to 3 As shown, further, the hydraulic steering gear 3 is connected to a steering pump 8, and the steering pump 8 is connected to a steering oil tank 7; the steering pump 8 is connected to the engine.

[0037] The beneficial effect of adopting the above further technical solution is that the steering oil tank can store oil. The steering pump is connected to the engine through a spline shaft. When the engine is running, it drives the steering pump to rotate and converts mechanical energy into hydraulic energy.

[0038] like Figures 1 to 3 As shown, further, the steering oil tank 7 is connected to the hydraulic steering gear 3 through the steering gear return oil pipe 5, and the steering oil tank 7 is connected to the steering pump 8 through the steering pump inlet pipe 6; the steering pump 8 is connected to the hydraulic steering gear 3 through the steering gear inlet pipe 4.

[0039] The beneficial effect of adopting the above-mentioned further technical solution is that the arrangement of the steering gear oil return pipe, the steering pump oil inlet pipe and the steering gear oil inlet pipe makes it easier for the steering oil tank to supply oil to the steering pump and for the hydraulic steering gear to return oil to the steering oil tank.

[0040] like Figures 1 to 3 As shown, further, the hydraulic steering gear 3 is connected to a left steering gear oil outlet pipe 13 and a right steering gear oil outlet pipe 14, the left steering gear oil outlet pipe 13 is connected to a left steering cylinder oil pipe 15, and the left steering cylinder oil pipe 15 is respectively connected to the rodless cavity of the left steering cylinder 16 and the rod cavity of the right steering cylinder 17; the right steering gear oil outlet pipe 14 is connected to a right steering cylinder oil pipe 18, and the right steering cylinder oil pipe 18 is respectively connected to the rod cavity of the left steering cylinder 16 and the rodless cavity of the right steering cylinder 17.

[0041] The beneficial effects of adopting this further technical solution include: the arrangement of the left steering gear oil outlet pipe, the steering gear oil outlet pipe, the left steering cylinder oil pipe, and the right steering cylinder oil pipe facilitates the hydraulic steering gear to control the extension and retraction of the left and right steering cylinders via hydraulic oil. Individual front wheel steering is achieved by simultaneously injecting oil into the left and right steering cylinders on the upper portion of the bracket, driving the rotating bearing disk to rotate. This simultaneous injection of oil into the left and right steering cylinders to drive the rotating bearing disk reduces the size of the steering cylinders and reduces costs.

[0042] like Figures 1 to 3 As shown, further, the hydraulic steering gear 3 is provided with a P port, a T port, an L port and an R port, the steering gear oil inlet pipe 4 is connected to the P port of the hydraulic steering gear 3, the steering gear oil return pipe 5 is connected to the T port of the hydraulic steering gear 3, the left steering gear oil outlet pipe 13 is connected to the L port of the hydraulic steering gear 3, and the right steering gear oil outlet pipe 14 is connected to the R port of the hydraulic steering gear 3.

[0043] The beneficial effect of adopting the above-mentioned further technical solution is that the design of the connection relationship between each interface of the hydraulic steering device and the pipeline facilitates the installation and maintenance of the pipeline.

[0044] like Figures 1 to 3 As shown, further, the upper part of the front connecting fork 10 is connected to the lower part of the rotating bearing disk 20 by bolts, the lower part of the rotating bearing disk 20 is installed on the bracket 9 by bolts, and the lower part of the front connecting fork 10 is connected to the wheel hub 12, and the wheel hub 12 is installed with a tire 11.

[0045] The beneficial effect of adopting the above-mentioned further technical solution is that the detachable connection through bolts facilitates the installation and maintenance of the front connecting fork, the rotating bearing plate and the bracket.

[0046] like Figures 1 to 3 As shown, further, one end of the left steering cylinder 16 and one end of the right steering cylinder 17 are hinged to the rotating bearing plate 20 through a connecting pin, and the other end of the left steering cylinder 16 and the other end of the right steering cylinder 17 are hinged to the bracket 9 through a connecting pin.

[0047] The beneficial effect of adopting the above-mentioned further technical solution is that the piston rod ends of the left and right steering cylinders are fixed to the rotating bearing plate via connecting pins, and the other piston ends of the left and right steering cylinders are fixed to the upper part of the bracket via connecting pins. This facilitates the left and right steering cylinders to drive the rotating bearing plate to rotate and prevents the left and right steering cylinders from getting stuck.

[0048] like Figures 1 to 3 As shown, further, a limit block 19 is installed on the bracket 9.

[0049] The beneficial effect of adopting the above-mentioned further technical solution is that the limit block plays a role in limiting the left steering cylinder and the right steering cylinder.

[0050] The embodiment of the present invention provides a steering system for a three-wheel drive tractor, which can be a steering system controlled by a steering cylinder for a new three-wheel drive tractor. By installing two double-acting piston rods (left steering cylinder 16 and right steering cylinder 17) on the upper part of the rotating bearing disc on the bracket, when the steering wheel (steering wheel 1) is turned, the pressure oil enters the rod chamber and the rodless chamber of the left and right steering cylinders through the hydraulic steering gear 3, thereby driving the rotating bearing disc 20 to rotate. When the rotating bearing disc 20 rotates, it drives the front connecting fork 10 to rotate, thereby driving the front wheel to rotate, and realizing the front wheel to turn left and right. In this way, the front wheel is turned from two-wheel steering to single-wheel steering, which makes the tractor's turning radius smaller and the steering more flexible. In a workplace where wheelbase adjustment is required, it can be achieved by simply adjusting the rear wheel track, and the front drive axle is replaced by the steering cylinder, and the front wheel tire (tire 11) is changed from two to one, which makes the cost of the tractor lower.

[0051] The present invention provides a steering system for a three-wheel-drive tractor controlled by a steering cylinder (a steering system for a three-wheel-drive tractor). In actual operation, the system drives the tractor's front wheels to rotate via two steering cylinders (a left steering cylinder 16 and a right steering cylinder 17) on the front wheel bracket (bracket 9), enabling the tractor to "turn left" or "turn right." The system primarily comprises a steering wheel 1, a spline shaft 2, a hydraulic steering gear 3, a steering oil pipe, a steering oil pot (steering oil tank 7), a steering pump 8, a left steering oil cylinder 16, a right steering oil cylinder 17, a bracket 9, a rotating bearing plate 20, a front connecting fork 10, a wheel hub 12, a tire 11, and connecting oil pipes.

[0052] The core of the utility model is a steering system (steering system of three-wheel drive tractor) controlled by a steering oil cylinder with a brand-new three-wheel drive tractor.

[0053] The steering wheel 1 is connected to the hydraulic steering gear 3 through a spline shaft 2.

[0054] There are four oil ports on the outside of the hydraulic steering gear 3, namely P port, T port, L port and R port.

[0055] The steering oil tank 7 can store oil, and the two oil ports at the bottom are connected to the steering pump oil inlet pipe 6 and the steering gear oil return pipe 5 respectively.

[0056] The steering pump 8 is connected to the engine through a spline shaft. When the engine is running, it drives the steering pump 8 to rotate, converting mechanical energy into hydraulic energy.

[0057] The upper part of the front connecting fork 10 is fixed to the lower part of the rotating bearing disk 20 (there are balls in the rotating bearing disk 20, and the upper part of the rotating bearing disk 20 is rotatable) by bolts, and the lower part of the front connecting fork 10 is fixed to the wheel hub 12 by fixing bolts.

[0058] The lower portion of the rotary bearing disc 20 is also fixed to the bracket 9 by bolts.

[0059] The tire 11 is fixed to the wheel hub 12 by bolts.

[0060] The left steering oil cylinder 16 and the right steering oil cylinder 17 fix the piston rod ends to the rotating bearing plate 20 through the connecting pin shaft, and the piston ends of the left steering oil cylinder 16 and the right steering oil cylinder 17 are fixed to the upper part of the bracket 9 through the connecting pin shaft.

[0061] The limit block 19 serves to limit the left steering cylinder 16 and the right steering cylinder 17 .

[0062] The steering gear oil inlet pipe 4, the steering gear oil return pipe 5, the steering pump oil inlet pipe 6, the left steering gear oil outlet pipe 13, the right steering gear oil outlet pipe 14, the left steering cylinder oil pipe 15, and the right steering cylinder oil pipe 18 are the steering system connecting pipes of the three-wheel drive tractor.

[0063] Other related connecting components, including mounting joints, fixed pipe clamps, brackets, bolts, etc., are connected through hydraulic pipelines to complete the oil circuit of the entire hydraulic system.

[0064] When the engine is started and the steering wheel 1 is stationary, the oil in the steering tank 7 enters the inlet of the steering pump 8 through the steering pump inlet pipe 6. The steering pump 8 pressurizes the oil and enters the P port of the hydraulic steering gear 3 through the steering gear inlet pipe 4. Since the steering wheel 1 is not moving at this time, the oil enters the steering tank 7 through the T-port return pipe of the hydraulic steering gear 3 (steering gear return pipe 5), completing the oil circulation when the steering system of the three-wheel drive tractor is in neutral. At this time, the front wheels are not moving (the state shown in the figure is the steering wheel inactive state).

[0065] When the engine is started and the steering wheel 1 turns left, the oil enters the inlet of the steering pump 8 through the steering tank 7 and the steering pump oil inlet pipe 6. The steering pump 8 pressurizes the oil and then enters the P port of the hydraulic steering gear 3 through the steering gear oil inlet pipe 4. The hydraulic steering gear 3 flows out from its L port through the internal rotary valve and metering pump into the left steering gear oil outlet pipe 13 and the left steering cylinder oil pipe 15, and respectively flows into the rodless chamber of the left steering cylinder 16 (at this time the piston rod of the left steering cylinder 16 extends) and the rod chamber of the right steering cylinder 17 (at this time the piston rod of the right steering cylinder 17 retracts). In this way, the piston rod of the left steering cylinder 16 "extends" outward and the piston rod of the right steering cylinder 17 "retracts" inward, driving the rotating bearing plate 20 to turn left. The rotating bearing plate 20 is connected to the front connecting fork 10, tire 11 and wheel hub 12 by fixing bolts. When the rotating bearing plate 20 turns left, the tire 11 turns left. When turning left, the oil in the rod chamber of the left steering cylinder 16 and the oil in the rodless chamber of the right steering cylinder 17 flow back to the R port of the hydraulic steering gear 3 through the right steering cylinder oil pipe 18 and the right steering gear oil outlet pipe 14. Since the internal R port and T port of the hydraulic steering gear 3 are connected when turning left, the oil flows back to the steering tank 7 through the steering gear return oil pipe 5, thereby realizing a left turn and completing the entire system cycle.

[0066] When the engine is started and the steering wheel 1 turns right, the oil flows through the steering tank 7 and the steering pump oil inlet pipe 6 into the inlet of the steering pump 8. The steering pump 8 pressurizes the oil and then enters the P port of the hydraulic steering gear 3 through the hydraulic steering gear oil inlet pipe (steering gear oil inlet pipe 4). The hydraulic steering gear 3 flows out from its R port through the internal rotary valve and metering pump into the right steering gear oil outlet pipe 14 and the right steering cylinder oil pipe 18, and respectively flows into the rodless chamber of the right steering cylinder 17 (at this time the piston rod of the right steering cylinder 17 extends) and the rod chamber of the left steering cylinder 16 (at this time the piston rod of the left steering cylinder 16 retracts). In this way, the piston rod of the right steering cylinder 17 "extends" outward and the piston rod of the left steering cylinder 16 "retracts" inward, driving the rotating bearing plate 20 to turn right. The rotating bearing plate 20 is connected to the front connecting fork 10, tire 11 and wheel hub 12 by fixing bolts. When the rotating bearing plate 20 turns right, the tire 11 turns right. When turning right, the oil in the rodless chamber of the left steering cylinder 16 and the oil in the rod chamber of the right steering cylinder 17 flow back to the L port of the hydraulic steering gear 3 through the left steering cylinder oil pipe 15 and the left steering gear oil outlet pipe 13. Since the internal L port and T port of the hydraulic steering gear 3 are connected when turning right, the oil flows back to the steering oil tank 7 through the steering gear return oil pipe 5, thereby realizing a right turn and completing the entire system cycle.

[0067] Individual front wheel steering is achieved by simultaneously pumping oil into the left and right steering cylinders on the upper portion of the bracket, driving the rotating bearing disc to rotate. Different front wheel steering angles can be achieved by adjusting the installation distance between the left and right steering cylinders.

[0068] 1. Using dual steering cylinders for steering enables a larger front wheel steering angle, thereby reducing the tractor's turning radius and making operation more flexible.

[0069] 2. The left steering cylinder and the right steering cylinder are simultaneously supplied with oil to push the rotating bearing plate to rotate, which reduces the size of the steering cylinder and reduces the cost.

[0070] In addition, the present invention also provides a tractor comprising the steering system of any one of the three-wheel drive tractors described above.

[0071] The beneficial effects of the technical solution of this utility model are as follows: by installing two double-acting piston rods on the upper portion of the bracket's rotating bearing disc, the rotating bearing disc is driven to rotate. When the rotating bearing disc rotates, the front connecting fork is driven to rotate, thereby driving the front wheel to rotate left and right. This changes the front wheel steering from two wheels to one wheel, thus reducing the tractor's turning radius and making it more flexible. In workplaces where wheelbase adjustment is required, it can be achieved by simply adjusting the rear wheel track. The front drive axle is replaced by a steering cylinder, and the front wheel tire is reduced from two to one, thus reducing the overall cost of the tractor.

[0072] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A steering system for a three-wheel drive tractor, characterized in that: include: A bracket (9), a front connecting fork (10), a left steering cylinder (16), a right steering cylinder (17), and a rotating bearing disc (20); the front connecting fork (10) is connected to the rotating bearing disc (20); the rotating bearing disc (20) is installed on the bracket (9); one end of the left steering cylinder (16) and one end of the right steering cylinder (17) are both hinged to the rotating bearing disc (20); the other end of the left steering cylinder (16) and the other end of the right steering cylinder (17) are both hinged to the bracket (9).

2. The steering system of a three-wheel drive tractor according to claim 1, characterized in that: The left steering oil cylinder (16) and the right steering oil cylinder (17) are both connected to a hydraulic steering gear (3), and the hydraulic steering gear (3) is connected to a steering wheel (1) via a spline shaft (2).

3. The steering system of a three-wheel drive tractor according to claim 2, characterized in that: The hydraulic steering gear (3) is connected to a steering pump (8), and the steering pump (8) is connected to a steering oil tank (7); the steering pump (8) is connected to an engine.

4. The steering system of a three-wheel drive tractor according to claim 3, characterized in that: The steering oil tank (7) is connected to the hydraulic steering gear (3) via a steering gear return oil pipe (5); the steering oil tank (7) is connected to the steering pump (8) via a steering pump oil inlet pipe (6); and the steering pump (8) is connected to the hydraulic steering gear (3) via a steering gear oil inlet pipe (4).

5. The steering system of a three-wheel drive tractor according to claim 4, characterized in that: The hydraulic steering gear (3) is connected to a left steering gear oil outlet pipe (13) and a right steering gear oil outlet pipe (14); the left steering gear oil outlet pipe (13) is connected to a left steering cylinder oil pipe (15); the left steering cylinder oil pipe (15) is respectively connected to the rodless cavity of the left steering cylinder (16) and the rod cavity of the right steering cylinder (17); the right steering gear oil outlet pipe (14) is connected to a right steering cylinder oil pipe (18); the right steering cylinder oil pipe (18) is respectively connected to the rod cavity of the left steering cylinder (16) and the rodless cavity of the right steering cylinder (17).

6. The steering system of a three-wheel drive tractor according to claim 5, characterized in that: The hydraulic steering gear (3) is provided with a P port, a T port, an L port and an R port. The steering gear oil inlet pipe (4) is connected to the P port of the hydraulic steering gear (3), the steering gear oil return pipe (5) is connected to the T port of the hydraulic steering gear (3), the left steering gear oil outlet pipe (13) is connected to the L port of the hydraulic steering gear (3), and the right steering gear oil outlet pipe (14) is connected to the R port of the hydraulic steering gear (3).

7. The steering system of a three-wheel drive tractor according to claim 1, characterized in that: The upper part of the front connecting fork (10) is connected to the lower part of the rotating bearing disc (20) through bolts, the lower part of the rotating bearing disc (20) is installed on the bracket (9) through bolts, the lower part of the front connecting fork (10) is connected to the wheel hub (12), and the wheel hub (12) is installed with a tire (11).

8. The steering system of a three-wheel drive tractor according to claim 1, characterized in that: One end of the left steering oil cylinder (16) and one end of the right steering oil cylinder (17) are both hinged to the rotating bearing plate (20) through a connecting pin, and the other end of the left steering oil cylinder (16) and the other end of the right steering oil cylinder (17) are both hinged to the bracket (9) through a connecting pin.

9. The steering system of a three-wheel drive tractor according to claim 1, characterized in that: A limiting block (19) is installed on the bracket (9).

10. A tractor, characterized in that: A steering system for a three-wheel drive tractor comprising the steering system of any one of claims 1 to 9.

Images