Rear axle assembly of cotton picker

Abstract

The utility model discloses a cotton picker rear axle assembly which comprises a rear axle shell assembly, a transmission mechanism, a left reduction assembly and a right reduction assembly, the left reduction assembly and the right reduction assembly are the same in structure, the left reduction assembly comprises a planetary gear mechanism, a first connecting flange and a steering knuckle, and a connecting shaft is arranged in the center of the rear end face of the steering knuckle. A through hole penetrating through the steering knuckle is formed in the center of the connecting shaft, and the first connecting flange is rotationally connected to the outer side wall of the connecting shaft of the steering knuckle through a bearing. The planetary gear mechanism comprises a planet carrier, a planet gear, a planet shaft and a gear ring, the planet carrier is of a cover-free structure, and the planet carrier and the first connecting flange are fixedly connected with the first connecting flange in the mode that bolts penetrate through connecting holes in the outer side of a side plate of the planet carrier.

Description

Technical Field

[0001] The utility model relates to a rear axle assembly of a cotton picker. Background Art

[0002] A cotton picker is a machine that can automatically pick cotton. Its working principle is to imitate the action of manual cotton picking. It picks cotton from the cotton plant by rotating the picking spindle and transporting the picked cotton to the collection box through the conveyor belt, and finally completes the picking work. In the rear axle assembly of traditional cotton pickers, the rear axle housing is generally made of integral castings, resulting in a long development cycle, heavy assembly weight, and complex structure. Utility Model Content

[0003] The purpose of the utility model is to solve the deficiencies of the above prior art and provide a cotton picker rear axle assembly.

[0004] A cotton picker rear axle assembly includes a rear axle housing assembly, a transmission mechanism, a left reduction assembly, and a right reduction assembly. The left reduction assembly and the right reduction assembly have the same structure. The left reduction assembly includes a planetary gear mechanism, a first connecting flange, and a steering knuckle. A connecting shaft is provided at the center of a rear end surface of the steering knuckle. A through hole penetrating the steering knuckle is provided at the center of the connecting shaft. The first connecting flange is rotatably connected to an outer side wall of the connecting shaft of the steering knuckle through a bearing.

[0005] The planetary gear mechanism includes a planet carrier, planetary gears, planetary shafts, and a gear ring. The planet carrier is a coverless structure. The planetary gears are rotatably connected to the planetary shafts through needle bearings. The planetary shafts are interference fit with the bottom plate of the planet carrier. The planet carrier is fixedly connected to the first connecting flange by bolts passing through the connecting holes on the outer side of the planet carrier side plate and the first connecting flange.

[0006] The gear ring is meshed with the planetary gear and the gear plate at the same time. The gear ring is located on the inner side of the planetary carrier, and the gear plate and the planetary gear are located on the inner side of the gear ring. The gear plate is fixedly connected to the connecting shaft by bolts. A groove is provided on the inner wall of the gear ring, and a steel ring is provided in the groove. The steel ring is also connected to the bottom surface of the gear plate.

[0007] The left reduction assembly and the right reduction assembly are respectively hinged on both sides of the rear axle housing assembly through steering knuckles.

[0008] Preferably, an oil seal is provided at the front port of the through hole at the center of the connecting shaft, and an oil seal is provided between the outer side wall of the connecting shaft and the first connecting flange.

[0009] Preferably, limiting studs are respectively provided on both sides of the steering knuckle, and corresponding limiting stops are provided on the rear axle housing assembly.

[0010] Preferably, the rear axle housing assembly includes a main reduction gearbox housing, an auxiliary reduction gearbox housing, a left axle housing and a right axle housing. The left axle housing and the right axle housing are respectively installed on both sides of the main reduction gearbox housing by a bolt structure, and the auxiliary reduction gearbox housing is installed on the front side of the main reduction gearbox housing by a bolt structure. The main reduction gearbox housing, the auxiliary reduction gearbox housing, the left axle housing and the right axle housing are all welded parts.

[0011] Preferably, the structure of the left bridge housing is the same as that of the right bridge housing, and the upper end surface and the lower end surface of the left bridge housing at one end away from the main side reduction housing are respectively provided with an upper pin groove and a lower pin groove, an upper pin sleeve is provided in the upper pin groove, and a lower pin sleeve is provided in the lower pin groove, and the lower pin sleeve is a spherical pin sleeve;

[0012] The front end surface of the steering knuckle is provided with a groove, the upper side wall and the lower side wall of the groove are provided with pin holes, the end of the left bridge housing away from the main side reduction housing is located in the groove, and the upper pin groove, the lower pin groove and the two pin holes are connected respectively through the steering shaft.

[0013] Preferably, a second connecting flange is provided on the front end face of the main reduction gearbox housing, a bridge mounting hole and a cylinder mounting plate are provided on both side end faces of the main reduction gearbox housing, and a main shaft pin hole is provided on the upper end of the main reduction gearbox housing.

[0014] Preferably, oil seals are provided at the notches of the upper pin groove and the lower pin groove.

[0015] Preferably, the transmission mechanism includes a main gearbox mechanism, an auxiliary gearbox mechanism, a left universal joint transmission shaft, a right universal joint transmission shaft, and a steering mechanism;

[0016] The auxiliary gearbox mechanism includes a driving gear, a driven gear, and a driven shaft. The driving gear is rotatably connected to the auxiliary gearbox housing through a bearing. The driven gear is fixedly connected to the driven shaft through a spline structure and meshes with the driving gear. The driven shaft is rotatably connected to the auxiliary gearbox housing through a bearing. One end of the driven shaft extends out of the auxiliary gearbox housing and is fixedly connected to one end of the bevel gear shaft through a spline structure. The other end of the bevel gear shaft is provided with a bevel gear structure. An oil seal is provided between the inner wall of the hole where the driven shaft is located and the outer wall of the driven shaft. The oil seal is located on the side of the bearing close to the hole.

[0017] The main gearbox mechanism includes a differential and a bevel gear ring. The bevel gear ring is fixedly sleeved on the outside of the differential. The bevel teeth of the bevel gear ring are meshed with the bevel gear structure of the bevel gear shaft. The left universal joint drive shaft and the right universal joint drive shaft are connected to the differential.

[0018] Preferably, the left universal joint transmission shaft and the right universal joint transmission shaft have the same structure, the left universal joint transmission shaft comprises a long fork shaft and a short fork shaft, the long fork shaft and the short fork shaft are hinged by a double fork structure, and the left universal joint transmission shaft is located in the inner cavity of the left bridge housing.

[0019] An oil seal and a bushing are provided between the long fork shaft and the inner cavity wall, the rotation axis of the steering knuckle and the left bridge housing coincides with the rotation axis of the double fork structure, a gear structure for meshing with the planetary gear is provided at the front end of the short fork shaft, and the short fork shaft is passed through the through hole of the connecting shaft.

[0020] Preferably, the steering mechanism includes a bidirectional hydraulic cylinder and two movable rods, wherein a piston rod is provided in the bidirectional hydraulic cylinder, wherein both ends of the piston rod are respectively connected to one end of a movable rod, and the other end of the movable rod is connected to the steering knuckle, and the piston rod is parallel to the long fork shaft.

[0021] Beneficial effects: Compared with the prior art, the shells of all mechanisms in the utility model are welded by steel plates, and the processing and forming is faster and more convenient. The inner cavity of the edge reduction assembly is formed by the steering knuckle, the connecting flange and the planetary carrier, and the overall structure is more convenient to process. The bridge housing is hinged by the cooperation of the pin sleeve and the pin shaft. The pin sleeve located at the bottom is subjected to greater force, so a spherical pin sleeve is used. The tooth plate and the gear ring in the planetary gear mechanism are meshed and positioned by the steel ring to prevent the tooth plate and the gear ring from displacement when they are in action. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is an external schematic diagram of a rear axle assembly of a cotton picker;

[0023] Figure 2 It is a cross-sectional view of the internal structure of a rear axle assembly of a cotton picker;

[0024] Figure 3 It is a schematic diagram of the steering of the rear axle assembly of a cotton picker;

[0025] Figure 4 It is a schematic diagram of the auxiliary gearbox mechanism;

[0026] Figure 5 is a schematic diagram of the main gearbox mechanism;

[0027] Figure 6 is a schematic diagram of the main reduction gearbox housing;

[0028] Figure 7 is a schematic diagram of the differential;

[0029] Figure 8 is a cross-sectional view of the left axle housing;

[0030] Fig. 9 is a schematic diagram of the left universal joint shaft;

[0031] Fig.10 It is a sectional view of the left minus assembly;

[0032] Fig.11 is a schematic diagram of the steering knuckle;

[0033] Fig.12 is a schematic diagram of the planet carrier;

[0034] In the figure, 1, left reduction assembly, 2, left axle housing, 3, main reduction box housing, 4, right axle housing, 5, right reduction assembly, 6, movable rod, 7, two-way hydraulic cylinder, 8, auxiliary gearbox housing, 9, limit stud, 10, piston rod, 11, left universal joint shaft, 12, right universal joint shaft, 13, steering shaft, 14, limit stopper, 15, bearing, 16, driving gear, 17, driven gear, 18, driven shaft, 19, differential, 20, bevel gear ring, 21, bevel gear shaft, 22, upper Pin groove, 23, lower pin groove, 24, upper pin sleeve, 25, lower pin sleeve, 26, short fork shaft, 27, double fork structure, 28, long fork shaft, 29, planetary carrier, 30, planetary shaft, 31, planetary gear, 32, ring gear, 33, gear plate, 34, first connecting flange, 35, connecting shaft, 36, steering knuckle, 37, pin hole, 38, bottom plate, 39, side plate, 40, cylinder mounting plate, 41, second connecting flange, 42, bridge mounting hole, 43, main shaft pin hole, 44, oil seal, 45, bushing. DETAILED DESCRIPTION

[0035] In order to deepen the understanding of the present invention, the present invention will be further described in detail below in conjunction with embodiments and drawings. The embodiments are only used to explain the present invention and do not constitute a limitation on the protection scope of the present invention.

[0036] like Figure 1-12 As shown, the left reduction assembly 1, the left axle housing 2, the main reduction box housing 3, the right axle housing 4, the right reduction assembly 5, the movable rod 6, the two-way hydraulic cylinder 7, the auxiliary transmission housing 8, the limit stud 9, the piston rod 10, the left universal joint shaft 11, the right universal joint shaft 12, the steering shaft 13, the limit stopper 14, the bearing 15, the driving gear 16, the driven gear 17, the driven shaft 18, the differential 19, the bevel gear ring 20, the bevel gear shaft 21, the upper pin slot 22, lower pin slot 23, upper pin sleeve 24, lower pin sleeve 25, short fork shaft 26, double fork structure 27, long fork shaft 28, planet carrier 29, planet shaft 30, planetary gear 31, gear ring 32, gear plate 33, first connecting flange 34, connecting shaft 35, steering knuckle 36, pin hole 37, bottom plate 38, side plate 39, cylinder mounting plate 40, second connecting flange 41, bridge mounting hole 42, main shaft pin hole 43, oil seal 44, bushing 45,

[0037] A rear axle assembly of a cotton picker includes a rear axle housing assembly, a transmission mechanism, a left reduction assembly 1, and a right reduction assembly 5. The rear axle housing assembly includes a main reduction gearbox housing, an auxiliary reduction gearbox housing, a left axle housing 2, and a right axle housing 4. The left axle housing 2 and the right axle housing 4 are respectively mounted on both sides of the main reduction gearbox housing by a bolt structure, and the auxiliary reduction gearbox housing is mounted on the front side of the main reduction gearbox housing by a bolt structure. The main reduction gearbox housing, the auxiliary reduction gearbox housing, the left axle housing 2, and the right axle housing 4 are all welded parts; a second connecting flange 41 and a cylinder mounting plate 40 are provided on the front end face of the main reduction gearbox housing 3, bridge mounting holes 42 are provided on both side end faces of the main reduction gearbox housing 3, a main shaft pin hole 43 is provided on the upper end of the main reduction gearbox housing 3, and the rear axle assembly is mounted on the chassis of the cotton picker through the main shaft pin hole 43.

[0038] The transmission mechanism includes a main gearbox mechanism, an auxiliary gearbox mechanism, a left universal transmission shaft 11, a right universal transmission shaft 12, and a steering mechanism;

[0039] The auxiliary gearbox mechanism includes a driving gear 16, a driven gear 17, and a driven shaft 18. The driving gear 16 is rotatably connected to the auxiliary gearbox housing 8 through a bearing 15. The driven gear 17 is fixedly connected to the driven shaft 18 through a spline structure and meshes with the driving gear 16. The driven shaft 18 is rotatably connected to the auxiliary gearbox housing 8 through a bearing 15. One end of the driven shaft 18 extends out of the auxiliary gearbox housing 8 and is fixedly connected to one end of a bevel gear shaft 21 through a spline structure. The other end of the bevel gear shaft 21 is provided with a bevel gear structure. An oil seal 44 is provided between the inner wall of the hole where the driven shaft 18 is located and the outer wall of the driven shaft 18. The oil seal 44 is located on the side of the bearing 15 close to the orifice.

[0040] The main gearbox mechanism includes a differential 19 and a bevel gear ring 20 . The bevel gear ring 20 is fixedly sleeved on the outside of the differential 19 . The bevel teeth 32 of the bevel gear ring are meshed with the bevel gear structure of the bevel gear shaft 21 . The left universal joint shaft 11 and the right universal joint shaft 12 are connected to the differential 19 .

[0041] The left universal joint transmission shaft 11 and the right universal joint transmission shaft 12 have the same structure. The left universal joint transmission shaft 11 includes a long fork shaft 28 and a short fork shaft 26. The long fork shaft 28 and the short fork shaft 26 are hinged by a double fork structure 27. The left universal joint transmission shaft 11 is located in the inner cavity of the left bridge housing 2. An oil seal 44 and a bushing 45 are provided between the long fork shaft 28 and the inner cavity wall. The rotation axis of the steering knuckle 36 and the left bridge housing 2 coincides with the rotation axis of the double fork structure 27. The front end of the short fork shaft 26 is provided with a gear structure for meshing with the planetary gear 31.

[0042] The left subtraction assembly 1 and the right subtraction assembly 5 have the same structure. The left subtraction assembly 1 includes a planetary gear 31 mechanism, a first connecting flange 34, and a steering knuckle 36. The front end surface of the steering knuckle 36 is provided with a groove, and the upper side wall and the lower side wall of the groove are both provided with pin holes 37. An oil seal 44 is provided at the front side port of the through hole at the center of the connecting shaft 35, and an oil seal 44 is provided between the outer side wall of the connecting shaft 35 and the first connecting flange 34.

[0043] Limiting studs 9 are respectively provided on both sides of the steering knuckle 36, a connecting shaft 35 is provided at the center of the rear end surface of the steering knuckle 36, a through hole penetrating the steering knuckle 36 is provided at the center of the connecting shaft 35, and the first connecting flange 34 is rotatably connected to the outer side wall of the connecting shaft 35 of the steering knuckle 36 through the bearing 15;

[0044] The planetary gear 31 mechanism includes a planetary carrier 29, a planetary gear 31, a planetary shaft 30, and a gear ring 32. The planetary carrier 29 is a coverless structure. The planetary gear 31 is rotatably connected to the planetary shaft 30 through a needle bearing 15. The planetary shaft 30 is interference-fitted with a bottom plate 38 of the planetary carrier 29. The planetary carrier 29 is fixedly connected to the first connecting flange 34 by bolts passing through the connecting holes on the outer side of the side plate 39 of the planetary carrier 29 and the first connecting flange 34.

[0045] The gear ring 32 is meshed with the planetary gear 31 and the toothed plate 33 at the same time. The gear ring 32 is located on the inner side of the planetary carrier 29. The toothed plate 33 and the planetary gear 31 are located on the inner side of the gear ring 32. The toothed plate 33 is fixedly connected to the connecting shaft 35 by bolts. A groove is provided on the inner wall of the gear ring 32. A steel ring is provided in the groove. The steel ring is also connected to the bottom surface of the toothed plate 33. The short fork shafts 26 of the left and right universal transmission shafts 12 are inserted into the through holes of the connecting shaft 35.

[0046] The structure of the left axle housing 2 is the same as that of the right axle housing 4. An upper pin groove 22 and a lower pin groove 23 are respectively provided on the upper end surface and the lower end surface of the left axle housing 2 at one end away from the main side reduction housing. An upper pin sleeve 24 is provided in the upper pin groove 22, and a lower pin sleeve 25 is provided in the lower pin groove 23. The lower pin sleeve 25 is a spherical pin sleeve. Oil seals 44 are provided at the notches of the upper pin groove 22 and the lower pin groove 23.

[0047] The ends of the left and right axle housings 4 away from the main side reduction housing are located in the groove, the upper pin groove 22, the lower pin groove 23 and the two pin holes 37 are connected respectively through the steering shaft 13, and a limit stop corresponding to the limit stud 9 is provided on the rear axle housing assembly.

[0048] The steering mechanism includes a bidirectional hydraulic cylinder 7 and two movable rods 6. A piston rod 10 is provided in the bidirectional hydraulic cylinder 7. Both ends of the piston rod 10 are respectively connected to one end of a movable rod 6. The other end of the movable rod 6 is connected to the steering knuckle 36. The piston rod 10 is parallel to the long fork shaft 28.

[0049] The auxiliary gearbox housing is a split structure, including a housing and a cover. The bottom of the housing is equipped with an oil drain bolt and an oil filler bolt. The bottom of the main reduction gearbox housing is equipped with a magnetic bolt to absorb impurities such as iron filings in the lubricating oil and to regularly clean the bottom oil stains.

[0050] The inner cavity of the left axle housing is provided with a baffle, and the surface of the baffle is provided with a through hole, and the through hole is provided with an oil seal and a bushing in sequence, and the long fork shaft penetrates the through hole, and the left axle housing is provided with a refueling bolt and a venting bolt. The bottom plate of the planetary carrier is provided with a magnetic bolt to absorb impurities such as iron filings in the lubricating oil.

[0051] Working principle: Add a proper amount of lubricating oil into the overall structure, the auxiliary transmission driving gear 16 drives the driven gear 17, and then drives the driven shaft 18, the driven shaft 18 drives the bevel gear shaft 21, the bevel gear shaft 21 drives the bevel gear ring 20 to rotate, and then drives the differential 19 fixedly connected to it to rotate, and then drives the left and right universal joint transmission shafts 12 to rotate, and the gear knots at the front ends of the left and right universal joint transmission shafts 12 drive the three planetary gears 31 to rotate around their respective planetary gear 31 axes, and the ring gear 32 is not only meshed with the planetary gears 31, but also meshed with the fixed gear plate 33, so the ring gear 32 cannot rotate with it, so that the planetary gears 31 drive the planet carrier 29 and the first connecting flange 34 to rotate around the connecting shaft 35.

[0052] When turning is required, the floating joint 10 of the left and right steering mechanisms pushes or pulls the steering knuckle 36 through the movable rod 6 to drive the left and right side reduction assemblies to rotate left or right to achieve turning. After the turn is completed, the cylinder returns the wheel to the center position through the movable rod 6.

[0053] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A cotton picker rear axle assembly, characterized in that: It includes a rear axle housing assembly, a transmission mechanism, a left reduction assembly, and a right reduction assembly. The left reduction assembly and the right reduction assembly have the same structure. The left reduction assembly includes a planetary gear mechanism, a first connecting flange, and a steering knuckle. A connecting shaft is provided at the center of the rear end surface of the steering knuckle. A through hole penetrating the steering knuckle is provided at the center of the connecting shaft. The first connecting flange is rotatably connected to the outer side wall of the connecting shaft of the steering knuckle through a bearing. The planetary gear mechanism comprises a planet carrier, planetary gears, planetary shafts, and a gear ring. The planet carrier is a coverless structure. The planetary gears are rotatably connected to the planetary shafts through needle bearings. The planetary shafts are interference fit with the bottom plate of the planet carrier. The planet carrier is fixedly connected to the first connecting flange by bolts passing through the connecting holes on the outer side of the planet carrier side plate and the first connecting flange. The gear ring is meshed with the planetary gear and the toothed plate at the same time. The gear ring is located on the inner side of the planetary carrier, and the toothed plate and the planetary gear are located on the inner side of the gear ring. The toothed plate is fixedly connected to the connecting shaft by bolts. A groove is provided on the inner side wall of the gear ring. A steel ring is provided in the groove. The steel ring is connected to the bottom surface of the toothed plate at the same time. The left reduction assembly and the right reduction assembly are respectively hinged on both sides of the rear axle housing assembly through steering knuckles.

2. A cotton picker rear axle assembly according to claim 1, characterized in that: An oil seal is arranged at the front side port of the through hole at the center of the connecting shaft, and an oil seal is arranged between the outer side wall of the connecting shaft and the first connecting flange.

3. A cotton picker rear axle assembly according to claim 2, characterized in that: Limiting studs are respectively provided on both sides of the steering knuckle, and corresponding limiting stoppers are provided on the rear axle housing assembly.

4. A cotton picker rear axle assembly according to claim 3, characterized in that: The rear axle housing assembly includes a main reduction gearbox housing, an auxiliary reduction gearbox housing, a left axle housing and a right axle housing. The left axle housing and the right axle housing are respectively installed on both sides of the main reduction gearbox housing by a bolt structure, and the auxiliary reduction gearbox housing is installed on the front side of the main reduction gearbox housing by a bolt structure. The main reduction gearbox housing, the auxiliary reduction gearbox housing, the left axle housing and the right axle housing are all welded parts.

5. A cotton picker rear axle assembly according to claim 4, characterized in that: The front end surface of the main reduction gearbox housing is provided with a second connecting flange and a cylinder mounting plate, the two side end surfaces of the main reduction gearbox housing are provided with bridge mounting holes, and the upper end of the main reduction gearbox housing is provided with a main shaft pin hole.

6. A cotton picker rear axle assembly according to claim 5, characterized in that: The structure of the left axle housing is the same as that of the right axle housing. The upper end surface and the lower end surface of the left axle housing away from the main side reduction housing are respectively provided with an upper pin groove and a lower pin groove. An upper pin sleeve is provided in the upper pin groove, and a lower pin sleeve is provided in the lower pin groove. The lower pin sleeve is a spherical pin sleeve. The front end surface of the steering knuckle is provided with a groove, the upper side wall and the lower side wall of the groove are provided with pin holes, the end of the left bridge housing away from the main side reduction housing is located in the groove, and the upper pin groove, the lower pin groove and the two pin holes are connected respectively through the steering shaft.

7. A cotton picker rear axle assembly according to claim 6, characterized in that: Oil seals are arranged at the notches of the upper pin groove and the lower pin groove.

8. The rear axle assembly of a cotton picker according to claim 7, characterized in that: The transmission mechanism includes a main gearbox mechanism, an auxiliary gearbox mechanism, a left universal transmission shaft, a right universal transmission shaft, and a steering mechanism; The auxiliary transmission mechanism comprises a driving gear, a driven gear and a driven shaft, wherein the driving gear is rotatably connected to the auxiliary transmission housing through a bearing, the driven gear is fixedly connected to the driven shaft through a spline structure and meshes with the driving gear, the driven shaft is rotatably connected to the auxiliary transmission housing through a bearing, one end of the driven shaft extends out of the auxiliary transmission housing and is fixedly connected to one end of the bevel gear shaft through a spline structure, the other end of the bevel gear shaft is provided with a bevel gear structure, an oil seal is provided between the inner wall of the hole where the driven shaft is located and the outer wall of the driven shaft, and the oil seal is located on the side of the bearing close to the orifice; The main gearbox mechanism includes a differential and a bevel gear ring. The bevel gear ring is fixedly sleeved on the outside of the differential. The bevel teeth of the bevel gear ring are meshed with the bevel gear structure of the bevel gear shaft. The left universal joint transmission shaft and the right universal joint transmission shaft are connected to the differential.

9. The rear axle assembly of a cotton picker according to claim 8, characterized in that: The left universal transmission shaft and the right universal transmission shaft have the same structure. The left universal transmission shaft comprises a long fork shaft and a short fork shaft. The long fork shaft and the short fork shaft are hinged via a double fork structure. The left universal transmission shaft is located in the inner cavity of the left bridge housing. An oil seal and a bushing are provided between the long fork shaft and the inner cavity wall, the rotation axis of the steering knuckle and the left bridge housing coincides with the rotation axis of the double fork structure, and a gear structure for meshing with the planetary gear is provided at the front end of the short fork shaft, and the short fork shaft is passed through the through hole of the connecting shaft.

10. The rear axle assembly of a cotton picker according to claim 8, characterized in that: The steering mechanism comprises a bidirectional hydraulic cylinder and two movable rods. A piston rod is arranged in the bidirectional hydraulic cylinder. Both ends of the piston rod are respectively connected to one end of a movable rod. The other end of the movable rod is connected to the steering knuckle. The piston rod is parallel to the long fork shaft.

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