Mountain articulated tractor

Abstract

The invention discloses a mountain articulated tractor, comprising a fuselage, a front axle assembly and a rear axle assembly, wherein the fuselage has a gearbox I shaft and a gearbox II shaft arranged in parallel up and down, and the gearbox I shaft is drivingly connected to the gearbox II shaft; the characteristics are: the front axle assembly is rotatably installed on the lower side of the fuselage with the axis of the gearbox II shaft as the rotation center, a waist twisting mechanism and a waist folding mechanism are provided between the rear axle assembly and the fuselage, the rear axle assembly is fixedly connected to the waist folding mechanism, the waist folding mechanism is rotatably connected to the waist twisting mechanism, and the waist twisting mechanism is rotatably connected to the fuselage with the axis of the gearbox II shaft as the rotation center, so that the fuselage, the front axle assembly and the waist twisting mechanism can all rotate around the axis of the gearbox II shaft. The invention has a compact structure, reasonably realizes the overall functional design of fuselage leveling, front axle swinging, waist twisting and waist folding of the mountain articulated tractor, has better mountain adaptability and flexibility, and has a good market promotion prospect.

Description

Technical Field

[0001] The invention relates to the technical field of tractors, and in particular to a mountain articulated tractor. Background Art

[0002] my country has a vast hilly and mountainous area, which is dominated by undulating terrain and irregular slopes. When a tractor is operating on a slope, the tractor's body and front / rear axles will tilt with the ground due to the slope's certain slope. When the tilt angle is large, it is easy to slip, roll over, and the driver fall off the tractor. Therefore, tractors operating on hilly slopes need to be equipped with a body leveling mechanism to ensure the safety of the tractor when operating on the slope.

[0003] Based on this, my country's patent CN117184261A discloses a tractor and its fuselage leveling structure, wherein the fuselage leveling structure includes: a front axle device, the front axle device is provided with a front axle input shaft, and the front axle input shaft is arranged along the front and rear direction of the tractor; a rear axle device, the rear axle device is provided with a rear axle input shaft, and the rear axle input shaft is also arranged along the front and rear direction of the tractor, wherein the front axle input shaft is coaxial with the rear axle input shaft; or, the extension line of the axis of the front axle input shaft and the axis of the rear axle input shaft are located in the same plane and intersect with each other; a fuselage, the fuselage is rotatably supported between the front axle device and the rear axle device, and the axis of the front axle input shaft serves as the rotation axis of the fuselage; a fuselage driving device, used to drive the fuselage to rotate relative to the front axle device and the rear axle device, and maintain the horizontal posture of the fuselage after the fuselage rotates to a horizontal posture. The invention can achieve fuselage leveling. However, this prior art only provides a technical idea that the rotation axis of the fuselage leveling is coaxial with the input shaft of the front and rear axle devices, and does not involve the specific settings of the front axle swing structure, the twisting waist and bending waist structure, etc. The front axle device of the traditional tractor is mainly installed under the engine or the gearbox, and its front axle swing structure is mainly used to increase the adaptability of the tractor in a bumpy road environment, and does not consider the leveling function. In addition, the lower front axle device makes the height of the entire tractor relatively large, and the structure is not compact enough. The existing articulated tractors use the gearbox shaft I as the twisting waist axis or the axis passing through the center point of the gearbox shaft I and shaft II and parallel to the gearbox shaft I as the twisting waist axis. They do not consider the need for body leveling when working on slopes, and cannot match and apply the fuselage leveling structure with the gearbox shaft II as the rotation center. Therefore, how to reasonably design the front axle swing mechanism of the mountain articulated tractor to achieve the overall functional design of bending waist, twisting waist and fuselage leveling has become a technical problem that needs to be solved in this industry. Summary of the invention

[0004] In view of the above-mentioned deficiencies in the prior art, an object of the present invention is to provide a mountain articulated tractor to solve the problems that the existing mountain articulated tractors do not take into account the need for body leveling when operating on slopes, the adaptability between various mechanisms is poor, and it is difficult to achieve overall functional design.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is as follows: a mountain articulated tractor, including a fuselage, a front axle assembly and a rear axle assembly, the fuselage having a gearbox I shaft and a gearbox II shaft arranged in parallel up and down, the gearbox I shaft being transmission-connected to the gearbox II shaft; the front axle assembly is rotatably installed on the lower side of the fuselage with the axis of the gearbox II shaft as the rotation center, a twisting mechanism and a folding mechanism are provided between the rear axle assembly and the fuselage, the rear axle assembly is fixedly connected to the folding mechanism, the folding mechanism is rotatably connected to the twisting mechanism, and the twisting mechanism is rotatably connected to the fuselage with the axis of the gearbox II shaft as the rotation center, so that the fuselage, the front axle assembly and the twisting mechanism can all rotate around the axis of the gearbox II shaft.

[0006] As an optimization, the fuselage is provided with a swing groove / hole running through the left and right sides thereof, the front axle assembly is placed in the swing groove / hole, and there is a spacing between the front axle assembly and the groove / hole wall of the swing groove / hole, and the gearbox II shaft is transmission connected to the front axle assembly.

[0007] As an optimization, a front supporting hole and a rear supporting hole are respectively provided on the front side wall and the rear side wall of the swing groove / hole, a front swing shaft is rotatably installed in the front supporting hole, and a rear swing shaft sleeve is rotatably installed in the rear supporting hole, the front swing shaft and the rear swing shaft sleeve are both coaxially arranged with the gearbox II shaft and fixedly connected with the front axle assembly, so that the front axle assembly can rotate around the axis of the gearbox II shaft; a first front axle small bevel gear shaft is coaxially installed at one end of the gearbox II shaft, and a first front axle small bevel gear is provided at the end of the first front axle small bevel gear shaft, and correspondingly, a front axle large bevel gear is provided in the front axle assembly, and the first front axle small bevel gear shaft can be rotatably passed through the rear swing shaft sleeve, so that the first front axle small bevel gear is meshed with the front axle large bevel gear.

[0008] As an optimization, wear-resistant bushings and / or wear-resistant pads are provided between the front swing shaft and the front support hole, and between the rear swing shaft sleeve and the rear support hole.

[0009] As an optimization, a through hole is coaxially provided in the front swing shaft, so that the front swing shaft forms a front swing shaft sleeve, and a second front axle small bevel gear shaft is rotatably inserted in the front swing shaft sleeve, and a second front axle small bevel gear meshing with the front axle large bevel gear is provided on the second front axle small bevel gear shaft; specifically, a front support bearing is coaxially installed in the front support hole and the front swing shaft sleeve, and the second front axle small bevel gear shaft is rotatably inserted in the two front support bearings; a rear support bearing is coaxially installed in the rear support hole and the rear swing shaft sleeve, and the first front axle small bevel gear shaft is rotatably inserted in the two rear support bearings, and sealing rings are provided between the front swing shaft sleeve and the front support hole, and between the rear swing shaft sleeve and the rear support hole.

[0010] As an optimization, the fuselage includes a power unit and a clutch housing, as well as a transfer case and / or a gearbox, which are connected in sequence from front to back, and the gearbox I shaft is connected to the power unit;

[0011] The lower side of one end of the clutch housing close to the transfer case or the gearbox is recessed upward to form a groove that runs through the side end surface and the lower side of the clutch housing, so that the clutch housing is L-shaped as a whole. The groove cooperates with the transfer case or the gearbox to form a swing groove with a U-shaped groove structure.

[0012] As an optimization, a reinforcing rib plate is provided at the opening of the U-shaped groove, and the two ends of the reinforcing rib plate are respectively connected to the clutch housing and the transfer case or the gearbox, so that the U-shaped groove and the reinforcing rib plate enclose a swing hole.

[0013] As an optimization, the rear axle assembly has a PTO power input shaft and a rear axle bevel gear input shaft; the gearbox I shaft is connected to the PTO power input shaft through the I shaft universal joint, and the gearbox II shaft is connected to the rear axle bevel gear input shaft through the II shaft universal joint; the twisting waist mechanism includes a twisting waist fixed seat and a twisting waist rotating seat, and the folding waist mechanism includes a folding waist rotating seat, wherein the twisting waist fixed seat is fixedly installed at the rear end of the gearbox, the twisting waist rotating seat is rotatably connected to the twisting waist fixed seat so that it can rotate around the axis of the gearbox II shaft, the folding waist rotating seat is rotatably connected to the twisting waist rotating seat so that it can rotate around the axis perpendicular to the gearbox II shaft, and the rear axle assembly is fixedly connected to the folding waist rotating seat.

[0014] As an optimization, a first U-shaped groove is provided on the lower side of the twist waist fixing seat, so that the lower part of the twist waist fixing seat forms a parallel front support plate and a rear support plate, and correspondingly, the twist waist rotating seat includes a body and a boss formed at the front end of the body and capable of being inserted into the first U-shaped groove, and a spacing is formed between the boss and the body to form a second U-shaped groove for the rear support plate to be inserted, and the boss and the groove wall of the first U-shaped groove, and the rear support plate and the groove wall of the second U-shaped groove are slidably matched or clearance matched; connecting holes are respectively opened on the front support plate, the boss, the rear support plate and the body, and the gearbox II shaft can be rotatably passed through each connecting hole in turn and connected to the input shaft of the rear axle bevel gear;

[0015] It also includes a twisting waist rotating sleeve, which can be rotated to pass through the front support plate, the boss, the rear support plate and the connecting holes on the body in sequence, and a support bearing is coaxially installed in the twisting waist rotating sleeve, and the gearbox II shaft is passed through the twisting waist rotating sleeve and installed on the support bearing;

[0016] Wear-resistant bushings are respectively arranged between the hole wall of each connecting hole and the twisting waist rotating sleeve.

[0017] As an optimization, the rear end of the body of the twisting waist rotating seat is formed with two connecting ears arranged opposite to each other in the upper and lower directions, and the folding waist rotating seat includes an upper folding waist rotating seat and a lower folding waist rotating seat, one end of the upper folding waist rotating seat and one end of the lower folding waist rotating seat are respectively connected to the two connecting ears through the upper folding waist rotating shaft and the lower folding waist rotating shaft, and the other end of the upper folding waist rotating seat and the other end of the lower folding waist rotating seat are respectively fixedly connected to the rear axle assembly, wherein the upper folding waist rotating shaft and the lower folding waist rotating shaft are coaxially arranged and their axes are perpendicular to the axis of the gearbox II shaft, so that the folding waist rotating seat can rotate around the axes of the upper folding waist rotating shaft and the lower folding waist rotating shaft; steering cylinders are respectively installed on the left and right sides of the lower side of the twisting waist rotating seat, one end of the two steering cylinders is connected to the twisting waist rotating seat, and the other end is respectively connected to the opposite sides of the lower folding waist rotating seat;

[0018] A through hole is provided on the upper part of the twist waist fixing seat, and a through hole is provided on the main body of the twist waist rotating seat. The gearbox I shaft passes through the through hole and the through hole in sequence and is connected to the PTO power input shaft, wherein the through hole is an arc-shaped strip hole.

[0019] Compared with the prior art, the present invention has the following advantages: through the overall design, the fuselage, the front axle assembly and the twisting waist mechanism all rotate around the gearbox II axis, so that the fuselage leveling function, the front axle swinging function and the overall twisting waist function of the rear axle are unified and combined, thereby improving the adaptability of the tractor to mountainous, hilly and other sloping lands, and the fuselage leveling, front axle swinging and rear axle twisting waist rotate relatively independently on the same axis, thereby improving the flexibility of the tractor when operating in mountainous and hilly areas, and the structure is more compact, thereby realizing the overall functional design of front axle swinging, fuselage leveling, twisting waist and folding waist. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the front axle structure of the whole machine in the first embodiment of the present invention;

[0021] Figure 2 This is a schematic diagram of the front view of the rear axle part of the whole machine in the first embodiment of the present invention;

[0022] Figure 3 It is a right side structural schematic diagram of the front axle part of the whole machine in the first embodiment of the present invention;

[0023] Figure 4 for Figure 1 A partial enlarged view of

[0024] Figure 5 It is a three-dimensional diagram of the twisted and bent waist part of the whole machine in the first embodiment of the present invention;

[0025] Figure 6 This is a schematic diagram of the front axle structure of the whole machine in the second embodiment of the present invention;

[0026] Figure 7 for Figure 6 A partial enlarged view of

[0027] In the figure: 1 front axle assembly, 2 rear axle assembly, 3 gearbox I shaft, 4 gearbox II shaft, 5 swing slot / hole, 6 front swing shaft, 7 rear swing bushing, 8 first front axle pinion gear shaft, 9 first front axle pinion gear, 10 front axle large bevel gear, 11 wear-resistant bushing, 12 wear-resistant pad, 13 front swing bushing, 14 second front axle pinion gear shaft, 15 second front axle pinion gear, 16 front support bearing, 17 rear support bearing, 18 power unit, 19 clutch housing, 20 transfer case, 21 gearbox, 22 reinforcing rib plate, 23 PTO power input shaft, 24 rear axle bevel gear input shaft, 25 Ⅰ shaft universal joint, 26 Ⅱ shaft universal joint, 27 twist waist fixing seat, 2701 front support plate, 2702 rear support plate, 28 twist waist rotating seat, 2801 body, 2802 boss, 2803 connecting ear, 29 twist waist rotating sleeve, 30 support bearing, 31 upper folding waist rotating seat, 32 lower folding waist rotating seat, 33 upper folding waist rotating shaft, 34 lower folding waist rotating shaft, 35 steering cylinder, 36 perforation, 37 through hole, 38 leveling device. DETAILED DESCRIPTION

[0028] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0029] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents the selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] It should be noted that similar numbers and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings. In the description of the present invention, it should be noted that the orientation or position relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. is based on the orientation or position relationship shown in the drawings, or the orientation or position relationship in which the invention product is usually placed when used, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance. In addition, the terms "horizontal", "vertical", etc. do not mean that the components are absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted. In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0031] Example 1: See Figure 1-Figure 5A mountain articulated tractor comprises a fuselage, a front axle assembly 1 and a rear axle assembly 2, wherein the fuselage has a gearbox I shaft 3 and a gearbox II shaft 4 which are arranged in parallel up and down, and the gearbox I shaft 3 is drivingly connected to the gearbox II shaft 4; the front axle assembly 1 is rotatably installed on the lower side of the fuselage with the axis of the gearbox II shaft 4 as the rotation center, and a twisting mechanism and a folding mechanism are provided between the rear axle assembly 2 and the fuselage, the rear axle assembly 2 is fixedly connected to the folding mechanism, the folding mechanism is rotatably connected to the twisting mechanism, and the twisting mechanism is rotatably connected to the fuselage with the axis of the gearbox II shaft 4 as the rotation center, so that the fuselage, the front axle assembly 1 and the twisting mechanism can all rotate around the axis of the gearbox II shaft 4.

[0032] Through the overall design, the fuselage, the front axle assembly 1 and the twisting mechanism all rotate around the gearbox II shaft 4, so that the fuselage leveling function, the front axle swinging function and the overall twisting function of the rear axle are unified and combined, which improves the adaptability of the tractor to slopes such as mountains and hills. The fuselage leveling, front axle swinging and rear axle twisting rotate relatively independently on the same axis, which improves the flexibility of the tractor when operating in mountainous and hilly areas, and the structure is more compact, thereby realizing the overall functional design of front axle swinging, fuselage leveling, twisting and folding.

[0033] Specifically, the fuselage is provided with a swinging slot / hole 5 running through the left and right sides thereof, the front axle assembly 1 is placed in the swinging slot / hole 5, and there is a spacing between the front axle assembly 1 and the slot / hole wall of the swinging slot / hole 5, and the gearbox II shaft 4 is connected to the front axle assembly 1 in a transmission manner. In this way, the front axle assembly 1 is embedded in the fuselage, which lowers the overall center of gravity and has a more compact structure, so that the front axle assembly 1 can rotate around the axis of the gearbox II shaft 4, so that the wheels or track structures installed at both ends can swing up and down to adapt to the bumpy road surface, ensuring that the wheels or track always maintain a large contact area with the road surface. In addition, in order to further optimize the coordination between the swinging of the front axle and the leveling of the fuselage to achieve the coordination between the leveling of the fuselage and the swinging of the front axle, the present embodiment further includes a leveling mechanism 38, which is connected to the fuselage and the front axle assembly 1 respectively, and can drive the fuselage and / or the front axle assembly 1 to rotate around the axis of the gearbox II shaft 4, and can keep the fuselage and / or the front axle assembly 1 at a preset rotation angle. Specifically, the leveling mechanism 38 includes two hydraulic cylinders or electric cylinders, which are arranged on both sides of the fuselage. One end of the hydraulic cylinder or electric cylinder is connected to the fuselage, and the other end is connected to the front axle assembly 1. The fuselage leveling and the swing of the front axle assembly 1 are achieved by controlling the extension and retraction of the hydraulic cylinder or electric cylinder. The two can act simultaneously or separately to ensure that for a certain road slope, the wheels or tracks on the front axle assembly 1 can maintain good contact with the road surface and the fuselage is level. The overall structure is simple and easy to control.

[0034] Furthermore, a front supporting hole and a rear supporting hole are respectively provided on the front side wall and the rear side wall of the swing groove / hole 5, a front swing shaft 6 is rotatably installed in the front supporting hole, and a rear swing shaft sleeve 7 is rotatably installed in the rear supporting hole, the front swing shaft 6 and the rear swing shaft sleeve 7 are both coaxially arranged with the gearbox II shaft 4 and fixedly connected with the front axle assembly 1, so that the front axle assembly 1 can rotate around the axis of the gearbox II shaft 4; a first front axle small bevel gear shaft 8 is coaxially installed at one end of the gearbox II shaft 4, and a first front axle small bevel gear 9 is provided at the end of the first front axle small bevel gear shaft 8, and correspondingly, a front axle large bevel gear 10 is provided in the front axle assembly 1, and the first front axle small bevel gear shaft 8 can be rotatably passed through the rear swing shaft sleeve 7, so that the first front axle small bevel gear 9 is meshed with the front axle large bevel gear 10. In this way, through the support of the front swing shaft 6 and the rear swing shaft sleeve 7, the front axle assembly 1 can stably swing left and right around the axis of the transmission II shaft 4, with higher stability and support strength, thereby better supporting the entire fuselage. At the same time, the transmission II shaft 4 transmits power to the front axle assembly 1 through the first front axle pinion gear shaft 8.

[0035] Since the weight of the fuselage is transferred to the front axle assembly 1 through the contact surfaces between the front swing shaft 6 and the rear swing shaft sleeve 7 and the front support hole and the rear support hole, there is a large pressure on the upper contact surfaces between the front swing shaft 6 and the front support hole and between the rear swing shaft sleeve 7 and the rear support hole. During the leveling of the fuselage and the swinging of the front axle assembly 1, the contact surface thereat is easily worn. For the traditional lower structure of the front axle assembly, it is connected to the gearbox through a long shaft. The long shaft is generally a multi-section structure, and each section is connected by a spline sleeve or a universal joint. There is a large radial clearance at the connection. Local wear of the shaft during use does not have much effect on the performance of the tractor as a whole. In this embodiment, since the front axle assembly 1 swings around the axis of the front swing shaft 6 and the rear swing shaft sleeve 7, when local wear occurs, the shaft will have a large eccentric lateral pressure, which is easy to cause the shaft to bend and deform or cause the whole machine to vibrate greatly, and even cause damage to components such as the shaft and gears, resulting in a high failure rate and affecting the performance of the whole machine. Therefore, large local wear is not allowed in this embodiment. In this embodiment, the swing angle of the front axle assembly 1 is limited, so it is easy to cause local wear on the upper side of the front swing shaft 6 and the rear swing shaft sleeve 7, as well as the upper sides of the front and rear support holes. Therefore, in order to improve the wear resistance, a wear-resistant bushing 11 and / or a wear-resistant pad 12 are provided between the front swing shaft 6 and the front support hole, and between the rear swing shaft sleeve 7 and the rear support hole. Specifically, a wear-resistant bushing 11 is sleeved on the outer side of the front swing shaft 6 and the rear swing shaft sleeve 7 to avoid the problem of local radial wear of the shaft and the hole when the front axle swings. A wear-resistant pad 12 is provided at the position where the end surface or the limit step of the front swing shaft 6 and the rear swing shaft sleeve 7 and the front support hole and the rear support hole cooperate to solve the axial wear problem caused by gravity decomposition when the tractor is tilted in the front and rear directions. The wear-resistant bushing 11 and the wear-resistant pad 12 are both made of wear-resistant materials to improve their wear resistance.

[0036] The fuselage includes a power unit 18 and a clutch housing 19, as well as a transfer case 20 and / or a gearbox 21, which are connected in sequence from front to back. The gearbox I shaft 3 is connected to the power unit 18. In this way, the power unit 18, the clutch housing 19, the transfer case 20 and / or the gearbox 21 are connected in sequence to form the fuselage, which has a simple and more compact structure, does not require an additional support frame structure, and reduces its own weight. Of course, in actual application, the order and presence or absence of each component can be flexibly adjusted according to the overall structure of the tractor, and the respective structural forms of the power unit 18, the clutch housing 19, the transfer case 20 and the gearbox 21 can also be flexibly adjusted.

[0037] The lower side of one end of the clutch housing 19 near the transfer case 20 or the gearbox 21 is recessed upward to form a groove that penetrates the side end surface and the lower side of the clutch housing 19, so that the clutch housing 19 is L-shaped as a whole. The groove cooperates with the transfer case 20 or the gearbox 21 to form a swing groove with a U-shaped groove structure. A reinforcing rib plate 22 is provided at the opening of the U-shaped groove. The two ends of the reinforcing rib plate 22 are respectively connected to the clutch housing 19 and the transfer case 20 or the gearbox 21, so that the U-shaped groove and the reinforcing rib plate 22 are surrounded to form a swing hole. Among them, the reinforcing rib plate 22 is U-shaped, and its two ends are respectively connected to the clutch housing 19 and the housing of the transfer case 20 or the gearbox 21, and the middle part sinks downward, so that the swing groove / hole 5 can provide a larger swing range for the front axle assembly 1, and has a certain connection strength to ensure the overall strength of the fuselage.

[0038] The rear axle assembly 2 has a PTO power input shaft 23 (PTO (POWER-TAKE-OFF), also known as a power take-off, is a device that outputs power from the engine to equipment other than the tractor's travel system, and is used to connect loads such as tillage tools) and a rear axle bevel gear input shaft 24; the gearbox I shaft 3 is connected to the PTO power input shaft 23 through the I shaft universal joint 25, and the gearbox II shaft 4 is connected to the rear axle bevel gear input shaft 24 through the II shaft universal joint 26; the twisting waist mechanism includes a twisting waist fixed seat 27 and a twisting waist rotating seat 28, and the folding waist mechanism includes a folding waist rotating seat, wherein the twisting waist fixed seat 27 is fixedly installed at the rear end of the gearbox 21, and the twisting waist rotating seat 28 is rotatably connected to the twisting waist fixed seat 27 so that it can rotate around the axis of the gearbox II shaft 4, and the folding waist rotating seat is rotatably connected to the twisting waist rotating seat 28 so that it can rotate around the axis perpendicular to the gearbox II shaft 4, and the rear axle assembly 2 is fixedly connected to the folding waist rotating seat. In this way, the tractor's twisting, body leveling and front axle swinging all rotate around the same axis (transmission II shaft 4), which is more reasonable and compact in structure. The twisting and folding structure can better adapt to existing body leveling tractors and meet the special requirements of hilly terrain for tractors.

[0039] Specifically, the waist twisting fixed seat 27 and the waist twisting rotating seat 28 adopt a buckling structure, and a first U-shaped groove is provided on the lower side of the waist twisting fixed seat 27, so that the lower part of the waist twisting fixed seat 27 forms a parallel front support plate 2701 and a rear support plate 2702, and correspondingly, the waist twisting rotating seat 28 includes a body 2801 and a boss 2802 formed at the front end of the body 2801 and capable of being inserted into the first U-shaped groove, and there is a spacing between the boss 2802 and the body 2801 to form a second U-shaped groove for the rear support plate 2702 to be inserted, and the boss 2802 and the groove wall of the first U-shaped groove, and the rear support plate 2702 and the groove wall of the second U-shaped groove are slidably matched or clearance matched; corresponding connecting holes are opened on the front support plate 2701, the boss 2802, the rear support plate 2702 and the body 2801, respectively, and the gearbox II shaft 4 can be rotatably passed through each connecting hole in turn and connected to the rear axle bevel gear input shaft 24;

[0040] In order to improve the strength of the connection and protect the gearbox II shaft 4, it also includes a twisting waist rotating sleeve 29, which can rotate through the front support plate 2701, the boss 2802, the rear support plate 2702 and the connecting holes on the body 2801 in sequence, and a support bearing 30 is coaxially installed in the twisting waist rotating sleeve 29. The gearbox II shaft 4 is passed through the twisting waist rotating sleeve 29 and installed on the support bearing 30, so that the twisting waist rotating sleeve 29 serves as the main force-bearing component to bear the load at the connection, effectively ensuring the stable operation of the gearbox II shaft 4.

[0041] In order to improve the wear resistance of the twisting waist rotating sleeve 29 , wear-resistant bushings 11 are respectively provided between the hole wall of each connecting hole and the twisting waist rotating sleeve 29 .

[0042] The rear end of the body 2801 of the twisting waist rotating seat 28 is formed with two connecting ears 2803 arranged opposite to each other in the upper and lower directions. The bending waist rotating seat includes an upper bending waist rotating seat 31 and a lower bending waist rotating seat 32. One end of the upper bending waist rotating seat 31 and one end of the lower bending waist rotating seat 32 are connected to the two connecting ears 2803 through an upper bending waist rotating shaft 33 and a lower bending waist rotating shaft 34, respectively. The other end of the upper bending waist rotating seat 31 and the other end of the lower bending waist rotating seat 32 are fixedly connected to the rear axle assembly 2, respectively. The upper bending waist rotating shaft 33 and the lower bending waist rotating shaft 34 are fixedly connected to the rear axle assembly 2, respectively. The shaft 34 is coaxially arranged and its axis is perpendicular to the axis of the gearbox II shaft 4, so that the folding waist rotating seat can rotate around the axes of the upper folding waist rotating shaft 33 and the lower folding waist rotating shaft 34; steering cylinders 35 are respectively installed on the left and right sides of the lower side of the twisting waist rotating seat 28, one end of the two steering cylinders 35 is connected to the twisting waist rotating seat 28, and the other end is respectively connected to the opposite sides of the lower folding waist rotating seat 32, so that the two steering cylinders 35 can push the lower folding waist rotating seat 32 to rotate around the lower folding waist rotating shaft 34, and then the entire rear axle assembly 2 rotates with the folding waist rotating seat to achieve folding.

[0043] A through hole 36 is provided on the upper part of the twisting waist fixing seat 27, and a through hole 37 is provided on the main body 2801 of the twisting waist rotating seat 28. The gearbox I shaft 3 passes through the through hole 36 and the through hole 37 in sequence and is connected to the PTO power input shaft 23, wherein the through hole 37 is an arc-shaped strip hole, so that the twisting waist rotating seat 28 will not interfere with the gearbox I shaft 3 when twisting the waist, thereby ensuring the stability of the tractor twisting waist.

[0044] By using the tractor gearbox II shaft 4 as the twisting center and setting two folding and rotating shafts in the vertical direction, the requirements of the tractor for bending and twisting the waist for body leveling are effectively met. The twisting and rotating seat 27 and the twisting and rotating seat 28 are mutually interlocking structures with good structural rigidity, which reliably connect the front and rear parts of the tractor for bending and twisting the waist. The twisting and folding mechanism is arranged between the tractor gearbox 21 and the rear axle housing, which effectively realizes the leveling function of the main body parts such as the tractor gearbox 21, the power unit, and the driving device, and meets the special requirements of the tractor for hilly terrain.

[0045] Example 2, see Figure 6-Figure 7, which is different from the first embodiment, a rotating structure is used at the front and rear swing shafts to replace the local reciprocating friction structure of the first embodiment. Specifically, a through hole is coaxially provided in the front swing shaft 6, so that the front swing shaft 6 forms a front swing shaft sleeve 13, and a second front axle small bevel gear shaft 14 is rotatably penetrated in the front swing shaft sleeve 13, and a second front axle small bevel gear 15 meshing with the front axle large bevel gear 10 is provided on the second front axle small bevel gear shaft 14; specifically, a front support bearing 16 is coaxially installed in the front support hole and the front swing shaft sleeve 13, and the second front axle small bevel gear shaft 14 is rotatably penetrated in the two front support bearings 16; a rear support bearing 17 is coaxially installed in the rear support hole and the rear swing shaft sleeve 7, and the first front axle small bevel gear shaft 8 is rotatably penetrated in the two rear support bearings 17, and sealing rings are provided between the front swing shaft sleeve 13 and the front support hole, and between the rear swing shaft sleeve 7 and the rear support hole. In this way, the first front axle pinion gear shaft 8 and the second front axle pinion gear shaft 14 serve as the swing shafts of the front axle assembly 1, and the front swing shaft sleeve 13 and the rear swing shaft sleeve 7 do not directly rub against the hole walls of the front support hole and the rear support hole, and sealing rings are provided between the front swing shaft sleeve 13 and the front support hole, and between the rear swing shaft sleeve 7 and the rear support hole to achieve sealing of the front support hole and the rear support hole, prevent dust and other impurities from entering the front support hole and the rear support hole, or prevent lubricating oil / grease in the front support hole and the rear support hole from seeping out, thereby ensuring the stable operation of the front support bearing 16 and the rear support bearing 17 as well as the first front axle pinion gear shaft 8 and the second front axle pinion gear shaft 14. Through such a structure, the front axle assembly 1 is supported in the swing groove / hole 5 by the first front axle pinion gear shaft 8 and the second front axle pinion gear shaft 14 and the front support bearing 16 and the rear support bearing 17, and the first front axle pinion gear shaft 8 is driven by the gearbox II shaft 4, and the second front axle pinion gear shaft 14 is driven by the second front axle pinion gear 15 to continuously rotate, so that the first front axle pinion gear shaft 8 and the second front axle pinion gear shaft 14 are evenly worn, thereby extending their service life, being less prone to uneven wear, and having better reliability in use.

[0046] In summary, the present invention has a compact structure, and reasonably realizes the overall functional design of body leveling, front axle swinging, and waist twisting and bending of the mountain articulated tractor. It has better mountain adaptability and flexibility, and has good market promotion prospects.

[0047] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit the technical solution. Those skilled in the art should understand that those modifications or equivalent substitutions of the technical solution of the present invention that do not depart from the purpose and scope of the technical solution should be included in the scope of the claims of the present invention.

Claims

1. A mountain articulated tractor, comprising a fuselage, a front axle assembly and a rear axle assembly, wherein the fuselage has a gearbox I shaft and a gearbox II shaft arranged in parallel up and down, wherein the gearbox I shaft is drivingly connected to the gearbox II shaft; characterized in that: The front axle assembly is rotatably mounted on the lower side of the fuselage with the axis of the gearbox II shaft as the rotation center, a twisting mechanism and a folding mechanism are provided between the rear axle assembly and the fuselage, the rear axle assembly is fixedly connected to the folding mechanism, the folding mechanism is rotatably connected to the twisting mechanism, and the twisting mechanism is rotatably connected to the fuselage with the axis of the gearbox II shaft as the rotation center, so that the fuselage, the front axle assembly and the twisting mechanism can all rotate around the axis of the gearbox II shaft; the fuselage is provided with a swinging slot / hole running through its left and right sides, and the front axle assembly is arranged In the swinging slot / hole, there is a spacing between the front axle assembly and the slot / hole wall of the swinging slot / hole, and the gearbox II shaft is drivingly connected to the front axle assembly; specifically, a front support hole and a rear support hole are respectively provided on the front side wall and the rear side wall of the swinging slot / hole, a front swinging shaft is rotatably installed in the front support hole, and a rear swinging shaft sleeve is rotatably installed in the rear support hole, the front swinging shaft and the rear swinging shaft sleeve are both coaxially arranged with the gearbox II shaft and fixedly connected to the front axle assembly, so that the front axle assembly can rotate around the axis of the gearbox II shaft; Specifically, the fuselage includes a power unit and a clutch housing, as well as a transfer case and / or a gearbox, which are connected in sequence from front to back, and the gearbox I shaft is connected to the power unit; The lower side of one end of the clutch housing close to the transfer case or the gearbox is recessed upward to form a groove that runs through the side end surface and the lower side of the clutch housing, so that the clutch housing is L-shaped as a whole. The groove cooperates with the transfer case or the gearbox to form a swing groove with a U-shaped groove structure.

2. A mountain articulated tractor according to claim 1, characterized in that: A first front axle small bevel gear shaft is coaxially mounted on one end of the gearbox II shaft, and a first front axle small bevel gear is disposed at the end of the first front axle small bevel gear shaft. Correspondingly, a front axle large bevel gear is disposed in the front axle assembly, and the first front axle small bevel gear shaft can be rotatably passed through the rear swing sleeve to mesh the first front axle small bevel gear with the front axle large bevel gear.

3. A mountain articulated tractor according to claim 2, characterized in that: Wear-resistant bushings and / or wear-resistant pads are provided between the front swing shaft and the front support hole, and between the rear swing shaft sleeve and the rear support hole.

4. A mountain articulated tractor according to claim 2, characterized in that: A through hole is coaxially provided in the front swing shaft, so that the front swing shaft forms a front swing shaft sleeve, and a second front axle small bevel gear shaft is rotatably inserted in the front swing shaft sleeve, and a second front axle small bevel gear meshing with the front axle large bevel gear is provided on the second front axle small bevel gear shaft; specifically, a front support bearing is coaxially installed in the front support hole and the front swing shaft sleeve, and the second front axle small bevel gear shaft is rotatably inserted in the two front support bearings; a rear support bearing is coaxially installed in the rear support hole and the rear swing shaft sleeve, and the first front axle small bevel gear shaft is rotatably inserted in the two rear support bearings, and sealing rings are provided between the front swing shaft sleeve and the front support hole, and between the rear swing shaft sleeve and the rear support hole.

5. The mountain articulated tractor according to claim 1, characterized in that: A reinforcing rib plate is provided at the opening of the U-shaped groove, and two ends of the reinforcing rib plate are respectively connected to the clutch housing and the transfer case or the gearbox, so that the U-shaped groove and the reinforcing rib plate enclose a swing hole.

6. The mountain articulated tractor according to claim 1, characterized in that: The rear axle assembly has a PTO power input shaft and a rear axle bevel gear input shaft; the gearbox I shaft is connected to the PTO power input shaft via an I shaft universal joint, and the gearbox II shaft is connected to the rear axle bevel gear input shaft via an II shaft universal joint; the twisting waist mechanism includes a twisting waist fixing seat and a twisting waist rotating seat, and the folding waist mechanism includes a folding waist rotating seat, wherein the twisting waist fixing seat is fixedly installed at the rear end of the gearbox, the twisting waist rotating seat is rotatably connected to the twisting waist fixing seat so that it can rotate around the axis of the gearbox II shaft, the folding waist rotating seat is rotatably connected to the twisting waist rotating seat so that it can rotate around the axis perpendicular to the gearbox II shaft, and the rear axle assembly is fixedly connected to the folding waist rotating seat.

7. A mountain articulated tractor according to claim 6, characterized in that: A first U-shaped groove is provided on the lower side of the twist waist fixing seat, so that the lower part of the twist waist fixing seat forms a parallel front support plate and a rear support plate. Correspondingly, the twist waist rotating seat includes a body and a boss formed at the front end of the body and capable of being inserted into the first U-shaped groove, and a spacing is formed between the boss and the body to form a second U-shaped groove for the rear support plate to be inserted. The boss and the groove wall of the first U-shaped groove, and the rear support plate and the groove wall of the second U-shaped groove are slidably matched or clearance matched; connecting holes are correspondingly opened on the front support plate, the boss, the rear support plate and the body, and the gearbox II shaft can be rotatably passed through each connecting hole in turn and connected to the input shaft of the rear axle bevel gear; It also includes a twisting waist rotating sleeve, which can be rotated to pass through the front support plate, the boss, the rear support plate and the connecting holes on the body in sequence, and a support bearing is coaxially installed in the twisting waist rotating sleeve, and the gearbox II shaft is passed through the twisting waist rotating sleeve and installed on the support bearing; Wear-resistant bushings are respectively arranged between the hole wall of each connecting hole and the twisting waist rotating sleeve.

8. The mountain articulated tractor according to claim 6, characterized in that: The rear end of the body of the twisting waist rotating seat is formed with two connecting ears arranged opposite to each other in the upper and lower directions, and the folding waist rotating seat includes an upper folding waist rotating seat and a lower folding waist rotating seat, one end of the upper folding waist rotating seat and one end of the lower folding waist rotating seat are respectively connected to the two connecting ears through the upper folding waist rotating shaft and the lower folding waist rotating shaft, and the other end of the upper folding waist rotating seat and the other end of the lower folding waist rotating seat are respectively fixedly connected to the rear axle assembly, wherein the upper folding waist rotating shaft and the lower folding waist rotating shaft are coaxially arranged and their axes are perpendicular to the axis of the gearbox II shaft, so that the folding waist rotating seat can rotate around the axes of the upper folding waist rotating shaft and the lower folding waist rotating shaft; steering cylinders are respectively installed on the left and right sides of the lower side of the twisting waist rotating seat, one end of the two steering cylinders is connected to the twisting waist rotating seat, and the other end is respectively connected to the opposite sides of the lower folding waist rotating seat; A through hole is provided on the upper part of the twist waist fixing seat, and a through hole is provided on the main body of the twist waist rotating seat. The gearbox I shaft passes through the through hole and the through hole in sequence and is connected to the PTO power input shaft, wherein the through hole is an arc-shaped strip hole.

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