Suspension oil cylinder steering system for harvester

Abstract

The utility model provides a suspension oil cylinder steering system for a harvester, which comprises a frame, wheels arranged on two sides of the front part of the frame, a pair of steering oil cylinders arranged on two sides of the frame, and a pair of suspension oil cylinders arranged on two sides of the frame, the steering oil cylinder on each side is connected with the upper portion of the suspension oil cylinder on the corresponding side, the lower portion of the suspension oil cylinder on each side is connected with the wheels on the corresponding side, and the steering oil cylinders drive the wheels to deflect to achieve steering. Rodless cavities of the two steering oil cylinders are communicated; the upper cavities of the two suspension oil cylinders are communicated, and the lower cavities of the two suspension oil cylinders are communicated. The front wheel suspension oil cylinder can rotate and can stretch and retract up and down, the steering and suspension effects are achieved, the front wheel suspension oil cylinder can control the elongation of the oil cylinder according to the amplitude change of a land parcel, the situation that front wheels land independently is avoided, and running stability and running safety are guaranteed.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of sugarcane harvester, specifically a kind of suspension oil cylinder steering system for harvester. BACKGROUND

[0002] Sugarcane harvester is one kind of agricultural combine harvesting machinery, through harvesting, impurity removal, segmenting and a series of actions, to realize the harvesting of sugarcane. Current research mainly focuses on the research direction of wheeled steering structure of sugarcane harvester.

[0003] In the research direction of wheeled steering structure of sugarcane harvester, since sugarcane will come from the front passage in the process of harvesting, the working condition of sugarcane harvesting is complex, in addition to hindering the entry of sugarcane crops into the passage, the traditional steering bridge box will also accumulate impurities, increase the wear of bridge box, cause damage to sugarcane harvester and reduce the harvesting efficiency. In order to make up for the defects, researchers have improved the steering structure, mainly by using connecting rod mechanical device to change the angle between the front wheel of sugarcane harvester and the frame, to achieve the purpose of changing the forward direction. For example, the steering structure of a kind of sugarcane harvester disclosed in China CN107046935A changes the length of connecting rod to change the rotation angle of tire, thereby achieving the purpose of steering.

[0004] The above structure realizes steering, but still has some shortcomings. The connecting rod needs to be connected by hinge, which needs to increase the hinge mounting point and the fixation of hinge on the frame, increase the weight of the whole vehicle and the power consumption of the whole vehicle harvesting. The fixed suspension of the whole vehicle needs to be constrained by hinge, which is easy to damage the ball hinge when working on rough sugarcane land, resulting in structural failure and even endangering the safety of driving.

[0005] In addition, due to the different plots of sugarcane planting, the cutting angle is also different, and the cutting table of sugarcane harvester will change the angle. In the existing scheme, the plot amplitude is large, the front wheel inclination angle changes greatly, and the front wheel tire may be single-sidedly supported. The change of the angle between single tire tread and ground is easy to cause structural damage and failure. INVENTION CONTENTS

[0006] The utility model provides a kind of steering structure device of sugarcane harvester, front wheel oil cylinder can be rotated and can be realized up and down telescopic, meet the effect of steering and suspension, when steering, oil cylinder telescopic realizes the change of connecting rod length, tire and front wheel oil cylinder are connected in series, the change of oil cylinder angle, the change of front wheel tire angle is pulled, so that the whole vehicle realizes steering. And front wheel suspension oil cylinder can control the elongation of oil cylinder according to the change of plot amplitude, avoid the emergence of the situation that front wheel is independently grounded, ensure the stability of driving and the safety of driving.

[0007] In order to achieve the above object, the utility model provides a kind of suspension oil cylinder steering system for harvester, including frame and the wheel being set in the front part of frame both sides, still including the pair of steering oil cylinder being set in frame both sides, the pair of suspension oil cylinder being set in frame both sides;The steering oil cylinder of each side is connected with corresponding one side suspension oil cylinder upper portion, and the wheel of corresponding one side is connected to the lower portion of each side suspension oil cylinder, the utility model cancels steering drag link, reduces the weight of steering system, and suspension oil cylinder is used to steer, the suspension oil cylinder of front wheel can be axially rotated and can be realized to move up and down telescopic, meets the effect of steering and suspension, and the degree of integration is high, and cost is lower.

[0008] The lower portion of the suspension oil cylinder is connected with the wheel;The steering oil cylinder drives the wheel to deflect to realize steering;The rodless cavity of the two steering oil cylinders is communicated, and hydraulic oil pipe is used for communication;The upper cavity of the two suspension oil cylinders is communicated, and the lower cavity of the two suspension oil cylinders is communicated.When steering, the steering oil cylinder realizes the change of connecting rod length, the tire and the front wheel oil cylinder are connected in series, the change of oil cylinder angle pulls the change of front wheel tire angle, so that the whole vehicle realizes steering.The suspension oil cylinder of the utility model can control the elongation of oil cylinder according to the change of land amplitude, avoid the situation that front wheel lands alone, and ensure the stability and safety of driving.

[0009] The utility model adopts connecting rod mechanism steering mode to accurately and actively control the steering of sugarcane harvester, compared with ball hinge fixing mode, the cost of fixed oil cylinder is lower, the installation form is more reliable, maintenance is simple, and the risk in driving process caused by hinge damage is also eliminated.

[0010] The utility model adopts two independent suspension oil cylinders to provide supporting force, compared with traditional hinge suspension, the structure is simpler, and also has self-adjusting ability when driving on rough road, ensures that tire is always on the ground during driving, makes driving output more stable, greatly reduces the risk of overturning during work.

[0011] The control of steering and suspension of the whole vehicle can be controlled by the hydraulic system of the whole vehicle, and the steering and the adjustment of the directional action of the four wheels of the whole vehicle can be realized synchronously, the structure is simplified, and integration is facilitated.

[0012] Preferably, the suspension oil cylinder of the utility model includes a rocker arm, a first piston rod, a cylinder body, a mounting support, a rotating shaft, a lower cylinder cover, a first piston, an upper cylinder cover, the rocker arm one end is connected with the first piston rod, the mounting support is arranged on the outer wall of the cylinder body, the rotating shaft is arranged at the lower part of the cylinder body and is rotationally connected with the wheel, the first piston is movably arranged in the cylinder body and the upper end is connected with the rocker arm, the first piston is rotationally arranged in the cylinder body along the axis, the first piston rod is connected with the first piston, and the cylinder body two ends are sealed with the lower cylinder cover and the upper cylinder cover. The steering oil cylinder is provided with a joint bearing, so that the steering does not lock and jam. The left and right front wheel oil cylinders are provided with support shafts, and the tires are fixed by the threaded end of the shaft and the locking nut. In the utility model, the suspension oil cylinder of the front wheel is connected with the front wheel rim through the locking nut, the tire rotation can be realized, the front wheel oil cylinder is fixedly connected with the frame through the bolt, the first piston rod can rotate along the cylinder body, the suspension oil cylinder is connected with the steering oil cylinder through the pin shaft, the steering can be realized by rotating along the pin shaft, and the rotating shaft is rotationally connected with the wheel and can drive the wheel to rotate.

[0013] Preferably, the utility model also includes a first bolt and a first nut, the first piston rod top structure is provided with an external spline structure, the inner hole of the rocker arm one end is connected with the spline of the piston rod top, and the opening of the rocker arm end is locked through the first bolt and the first nut. The first piston rod of the suspension oil cylinder of the utility model is matched with the rocker arm through the spline, and the opening bolt nut locking of the rocker arm can realize the elimination of the spline gap.

[0014] It also includes a first pin shaft, a second pin shaft and a second bolt, the mounting support outer circumference is provided with a through hole, the mounting support is locked on the frame through the second bolt, the rear end of the steering oil cylinder is connected with the frame through the first pin shaft, the other end of the rocker arm is connected with the piston rod of the steering oil cylinder through the second pin shaft, and the second pin shaft end is locked through the slotted nut.

[0015] The steering oil cylinder of the utility model is directly fixed to the frame through the bolt, the relative position of the front wheel of the sugarcane harvester can be controlled in the advancing process, the structure form connected through the hinge is eliminated, the installation, fixation and accessory replacement form are simplified, and the hidden danger of structure failure caused by hinge damage is avoided.

[0016] Preferably, one end of the rotating shaft is fixedly connected with the lower part of the first piston rod, and the other end of the rotating shaft is provided with a thread matched with the wheel. The suspension oil cylinder of the left and right front wheels of the utility model is provided with a support shaft, that is, the rotating shaft, and the tire is fixed by the threaded end of the shaft and the locking nut.

[0017] Preferably, it also includes a steering gear, and the rod cavities of the two steering oil cylinders are connected with the steering gear.

[0018] Compared with the prior art, the utility model has the following beneficial effects:

[0019] The utility model cancels the mode of steering by pull rod in the prior art, adopts the piston rod of suspension oil cylinder to drive the transformation, the structure is simplified, realizes the lightweight of car body, adopts the linkage mechanism steering mode to control the steering of sugarcane harvester accurately, compared with the ball hinge fixed mode, the cost of fixed steering oil cylinder is lower, the installation form is more reliable, and the maintenance is simple, also prevents the risk in the running process caused by hinge damage.

[0020] The utility model adopts two suspension oil cylinders to provide supporting force, compared with the traditional hinge suspension, the structure is simpler, and also has the self -adjusting ability of running on the rugged road, ensures that the tire is always grounded in the running process, makes the running output more stable, greatly reduces the risk of overturning in the working process.

[0021] The control of the steering and suspension of the whole vehicle can be controlled by the hydraulic system of the whole vehicle, the steering and the adjustment of the directional action of the four wheels of the whole vehicle can be realized synchronously, the structure is simplified, and integration is facilitated. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 It is a structure schematic view of a suspension oil cylinder steering system for a harvester.

[0023] Figure 2 It is a structure schematic view of a suspension oil cylinder steering system for a harvester installed on a vehicle frame.

[0024] Figure 3 It is a structure schematic view of a suspension oil cylinder.

[0025] Figure 4 It is a structure view of a rocker arm and a first piston rod of the utility model.

[0026] Figure 5 It is an oil circuit view of the suspension oil cylinder.

[0027] Figure 6 It is an oil circuit view of the steering oil cylinder.

[0028] In the drawing: 1-vehicle frame, 2-wheel, 3-steering oil cylinder, 4-suspension oil cylinder, 401-rocker arm, 402-first piston rod, 403-cylinder body, 404-mounting support, 405-rotation shaft, 406-lower cylinder cover, 407-first piston, 408-upper cylinder cover, 409-first bolt, 410-first nut, 5-first pin shaft, 6-second pin shaft, 7-slotted nut, 8-steering gear, 801-hydraulic valve block. DETAILED DESCRIPTION

[0029] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. The illustrative embodiments and descriptions of the present invention are used to explain the present invention and do not constitute an improper limitation of the present invention.

[0030] In the description of this utility model, it should be understood that the terms "left", "right", "up", "down", "front", "back", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or structure referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0031] Example 1:

[0032] like Figures 1-2 As shown, a hydraulic cylinder steering system for a harvester includes a frame 1 and wheels 2 disposed on both sides of the front of the frame 1. It also includes a pair of steering cylinders 3 disposed on both sides of the frame 1 and a pair of suspension cylinders 4 disposed on both sides of the frame 1. The steering cylinder 3 on each side is connected to the upper part of the corresponding suspension cylinder 4, and the lower part of the suspension cylinder 4 on each side is connected to the corresponding wheel 2. The steering cylinder 3 drives the wheel 2 to deflect to achieve steering.

[0033] like Figures 5-6 As shown, the rodless chambers of the two steering cylinders 3 are connected; the upper chambers of the two suspension cylinders 4 are connected; and the lower chambers of the two suspension cylinders 4 are connected.

[0034] In this example, the hydraulic cylinder serves both steering and support functions. The movable ends of the hydraulic cylinder, namely the upper and lower ends, are connected to the steering cylinder 3 and the wheel 2, respectively, thus achieving steering. Compared with existing technologies, this simplifies the steering tie rod.

[0035] In this example, the two steering cylinders 3 of the steering mechanism work in tandem. When the steering gear 8 is driven to turn, the hydraulic valve block 801 receives the steering command and the valve opens. When turning left, the left oil circuit of the valve block opens, oil enters the rod chamber of the left steering cylinder 3 and exits the rodless chamber, causing the cylinder to retract and drive the left wheel to move to the right. The oil circuits of the rodless chambers of both steering cylinders 3 are connected in series, so oil enters the rodless chamber of the right steering cylinder 3 and exits the rod chamber, causing the cylinder to extend and drive the right wheel to turn to the left as well. The opposite occurs when turning right. The steering motion is achieved by changing the extension and retraction length of the cylinders.

[0036] The two suspension oil cylinders 4 of the suspension system of the present example also work in linkage, and the suspension oil cylinders 4 are fixed on the frame 1 respectively on the left and right sides. When driving on a flat road, the pressures in the upper and lower chambers of the front wheel oil cylinders on the left and right sides are the same, and the piston position remains unchanged, and the piston rod plays a supporting role. When driving on a road with the left side being lower and the right side being higher, the center of gravity of the whole vehicle is deviated to the left side, the suspension oil cylinder 4 on the left side is pressed to cause a pressure difference between the upper and lower chambers, and the pressure in the upper chamber is less than that in the lower chamber. The hydraulic oil cylinder contracts, the upper chamber of the front wheel oil cylinder on the left side is connected in series with the upper chamber of the front wheel oil cylinder on the right side, the upper chamber of the front wheel on the right side is filled with oil, the oil pressure in the upper chamber is greater than that in the lower chamber, the hydraulic oil in the upper chamber of the suspension oil cylinder 4 on the left side flows into the upper chamber of the suspension oil cylinder 4 on the right side, the suspension oil cylinder 4 on the left side contracts, and the suspension oil cylinder 4 on the right side extends. At the same time, the lower chambers of the left and right oil cylinders are connected in series, the lower chamber of the suspension oil cylinder 4 on the left side is filled with oil, the lower chamber of the suspension oil cylinder 4 on the right side is discharged to accelerate the contraction and extension of the oil cylinder, and the driving posture of the whole vehicle is adjusted in time. When the right tire touches the ground, the pressures in the upper and lower chambers of the suspension oil cylinder 4 on the left side are balanced, and the piston stops moving. The right side is opposite.

[0037] The present example has the self-adjusting ability of driving on a rough road, ensures that the tire is always in contact with the ground during driving, makes the driving output more stable, and greatly reduces the risk of overturning during work.

[0038] Embodiment 2

[0039] As shown in Figures 1-2 A suspension oil cylinder steering system for a harvester includes a frame 1 and wheels 2 arranged on both sides of the front part of the frame 1. In the present example, the wheels 2 are front wheels, and the wheels 2 on both sides are left and right wheels 2.

[0040] It also includes a pair of steering oil cylinders 3 arranged on both sides of the frame 1 and a pair of suspension oil cylinders 4 arranged on both sides of the frame 1. The steering oil cylinder 3 on each side is connected to the upper part of the corresponding suspension oil cylinder 4, and the lower part of the suspension oil cylinder 4 on each side is connected to the corresponding wheel 2. The lower part of the suspension oil cylinder 4 is connected to the wheel 2. The steering oil cylinder 3 drives the wheel 2 to deflect to achieve steering. The rodless chambers of the two steering oil cylinders 3 are connected by a hydraulic oil pipe. The lower chambers of the two suspension oil cylinders 4 are connected by a hydraulic oil pipe, and the upper chambers of the two suspension oil cylinders 4 are connected by a hydraulic oil pipe.

[0041] In the present example, the two steering oil cylinders 3 are symmetrically arranged and have the same structure, and the two suspension oil cylinders 4 are also symmetrically arranged and have the same structure. The steering oil cylinder 3 is provided with a knuckle bearing, so that the steering will not be locked or stuck.

[0042] As shown in Figure 3As shown in the embodiment, the suspension oil cylinder 4 of the utility model comprises a rocker arm 401, a first piston rod 402, a cylinder body 403, a mounting support 404, a rotating shaft 405, a lower cylinder cover 406, a first piston 407 and an upper cylinder cover 408, one end of the rocker arm 401 is connected with the first piston rod 402, the mounting support 404 is arranged on the outer wall of the cylinder body 403, the rotating shaft 405 is arranged at the lower part of the cylinder body 403 and is rotationally connected with the wheel 2, the first piston 407 is movably arranged in the cylinder body 403 and the upper end of the first piston 407 is connected with the rocker arm 401, the first piston 407 is rotationally arranged in the cylinder body 403 along the axis of the first piston 407, in the utility model, the first piston 407 is communicated with the first piston rod 402 and can move up and down or rotate axially, so that the requirements of suspension stretching and turning are met.

[0043] As shown in the embodiment, Figure 1 The rocker arm 401, the first piston rod 402, the rotating shaft 405 and the wheel 2 are connected by a connecting rod, the steering oil cylinder 3 and the rocker arm 401 are horizontally arranged and are arranged at a certain angle, the rotating shaft 405 is also horizontally arranged and is arranged at a certain angle with the rocker arm 401. The connecting rod structure realizes the conversion of the stretching and contracting movement of the steering oil cylinder 3 into the rotating movement of the wheel 2, simplifies the pull rod structure in the prior art and simplifies the structure.

[0044] In the embodiment, the cylinder body 403 is sealed by the lower cylinder cover 406 and the upper cylinder cover 408 at both ends. The left and right front wheel oil cylinders are provided with supporting shafts, and the tires are fixed by the locking nuts at the ends of the shafts.

[0045] As shown in the embodiment, Figure 4 In the embodiment, the utility model further comprises a first bolt 409 and a first nut 410, one end of the rocker arm 401 and the first piston rod 402 are provided with a clamping part and are arranged as an opening, the top of the first piston rod 402 is provided with an external spline structure, the inner hole of one end of the rocker arm 401 is connected with the spline at the top of the piston rod, and the opening at the end of the rocker arm 401 is locked by the first bolt 409 and the first nut 410.

[0046] As shown in the embodiment, Figure 1 The embodiment further comprises a first pin shaft 5, a second pin shaft 6 and a second bolt 411, the mounting support 404 is provided with a through hole at the outer circumference, the mounting support 404 is locked on the frame 1 by the second bolt 411, the rear end of the steering oil cylinder 3 is connected with the frame 1 by the first pin shaft 5, and the other end of the rocker arm 401 is connected with the piston rod of the steering oil cylinder 3 by the second pin shaft 6. The multiple pin shafts are connected, so that the steering system can rotate smoothly.

[0047] In this embodiment, the rotating shaft 405 is welded and fixed at one end of the first piston rod 402, and the other end of the rotating shaft 405 is provided with threads matched with the wheel 2. The suspension oil cylinder 4 of the left and right front wheels in this embodiment is provided with a supporting shaft, i.e. the rotating shaft 405, and the tire is fixed by the threaded end of the rotating shaft 405 with a locking nut.

[0048] As shown in Figure 6 In this embodiment, a steering gear 8 is further included, and the rod chambers of the two steering oil cylinders 3 are connected to the steering gear 8.

[0049] The specific working mode of this embodiment is as follows:

[0050] As shown in Figure 6 The working principle of the steering system is as follows: when the steering gear 8 is driven to steer, the hydraulic valve block 801 receives the steering instruction, and the valve is opened. When the left steering instruction is received, the left oil way of the valve block is opened, the rod chamber of the left steering oil cylinder 3 is filled with oil, and the rodless chamber is discharged, the second piston rod is retracted, and the left wheel is driven to move rightward. The rodless chambers of the left and right steering oil cylinders 3 are connected in series, the rodless chamber of the right steering oil cylinder 3 is filled with oil, the rod chamber is discharged, the oil cylinder is elongated, and the right wheel is also driven to move leftward. The opposite is true. With the change of the extension length of the steering oil cylinder 3, the steering movement is realized.

[0051] As shown in Figure 5 The working principle of the suspension system is as follows: the suspension oil cylinder 4 is fixed on the frame 1 by bolts, and the rotating shaft 405 is provided on the suspension oil cylinder 4. One end of the rotating shaft 405 is connected to the first piston rod 402, and the other end of the rotating shaft 405 is provided with threads. The tire is locked with the rotating shaft 405 by a nut, and the freedom degrees of the tire in the transverse and longitudinal directions are limited, and the tire can rotate along the shaft.

[0052] When driving on a flat road, the pressures in the upper and lower chambers of the left and right front wheel oil cylinders are the same, the piston position remains unchanged, and the first piston rod 402 plays a supporting role.

[0053] When walking on the left low and right high road surface, the whole vehicle center of gravity is deviated to the left side, the left side suspension oil cylinder 4 is pressed to cause the pressure difference between the upper and lower chambers, the upper chamber pressure is less than the lower chamber pressure, the oil cylinder upper chamber oil, the oil cylinder contraction, the left side front wheel oil cylinder upper chamber and the right side front wheel oil cylinder upper chamber are connected in series, the right side front wheel upper chamber oil, the upper chamber oil pressure is greater than the lower chamber oil pressure, the left side suspension oil cylinder 4 upper chamber hydraulic oil flows into the right side suspension oil cylinder 4 upper chamber, the left side suspension oil cylinder 4 contraction, the right side suspension oil cylinder 4 stretch out, avoid the tire off the ground, the tire always adhere to the ground, driving smoothly; At the same time, the lower chambers of the left and right suspension oil cylinders 4 are connected in series, the lower chamber of the left side suspension oil cylinder 4 is filled with oil, the lower chamber of the right side suspension oil cylinder 4 is discharged to accelerate the oil cylinder retraction and extension, and timely adjust the whole vehicle driving posture. When the right side tire is grounded, the lower chamber pressure of the left side suspension oil cylinder 4 is balanced, and the first piston 407 stops moving. The right side movement is contrary.

Claims

1. A suspension cylinder steering system for a harvester comprising a frame (1) and wheels (2) arranged on both sides of the front part of the frame (1), characterized in that: Also include a pair of steering oil cylinder (3) arranged on both sides of the frame (1), a pair of suspension oil cylinder (4) arranged on both sides of the frame (1); the steering oil cylinder (3) of each side is connected with the upper part of the corresponding side suspension oil cylinder (4), and the lower part of the suspension oil cylinder (4) of each side is connected with the corresponding side wheel (2), the steering oil cylinder (3) drives the wheel (2) to deflect to realize steering; the rodless cavity of the two steering oil cylinders (3) is communicated; the upper cavity of the two suspension oil cylinders (4) is communicated, and the lower cavity of the two suspension oil cylinders (4) is communicated.

2. A suspension cylinder steering system for a harvester as claimed in claim 1, characterized in that: The suspension oil cylinder (4) comprises a rocker arm (401), a first piston rod (402), a cylinder body (403), a mounting support (404), a rotating shaft (405), a lower cylinder cover (406), a first piston (407), and an upper cylinder cover (408), one end of the rocker arm (401) is connected with the first piston rod (402), the mounting support (404) is arranged on the outer wall of the cylinder body (403), the rotating shaft (405) is arranged at the lower part of the cylinder body (403) and is rotationally connected with the wheel (2), the first piston (407) is movably arranged in the cylinder body (403) and the upper end of the first piston (407) is connected with the rocker arm (401), the first piston (407) is rotationally arranged in the cylinder body (403) along the axis thereof, and the cylinder body (403) is sealed at both ends by the lower cylinder cover (406) and the upper cylinder cover (408).

3. A suspension cylinder steering system for a harvester as claimed in claim 2, characterized in that: Also include a first bolt (409) and a first nut (410), the top of the first piston rod (402) is provided with an external spline structure, the inner hole of one end of the rocker arm (401) is connected with the spline of the top of the piston rod in a matched mode, and the opening at the end of the rocker arm (401) is locked by the first bolt (409) and the first nut (410).

4. A suspension cylinder steering system for a harvester as defined in claim 2, characterized in that: Also include a first pin shaft (5), a second pin shaft (6) and a second bolt (411), the mounting support (404) is provided with a through hole in the outer circumference, the mounting support (404) is locked on the frame (1) by the second bolt (411), the rear end of the steering oil cylinder (3) is connected with the frame (1) by the first pin shaft (5), and the other end of the rocker arm (401) is connected with the piston rod of the steering oil cylinder (3) by the second pin shaft (6).

5. A suspension cylinder steering system for a harvester as defined in claim 2, wherein: One end of the rotating shaft (405) is welded with the lower part of the first piston rod (402), and the other end of the rotating shaft (405) is provided with a thread matched with the wheel (2).

6. A suspension cylinder steering system for a harvester as defined in claim 2, wherein: Also include a steering device (8), the rod cavity of the two steering oil cylinders (3) is connected with the steering device (8).

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