Waist twisting and bowing mechanism of mountain land articulated tractor

Abstract

The utility model discloses a mountain land articulated tractor waist twisting and bowing mechanism which comprises a gearbox and a rear axle assembly, the gearbox is provided with a gearbox I shaft and a gearbox II shaft which are arranged in parallel up and down, and a waist twisting fixing seat, a waist twisting rotating seat and a bowing rotating seat are arranged between the gearbox and the rear axle assembly, the waist twisting fixing seat is fixedly installed at the rear end of the gearbox, the waist twisting rotating seat is rotatably connected with the waist twisting fixing seat so that the waist twisting fixing seat can rotate around the axis of a shaft II of the gearbox, and the waist folding rotating seat is rotatably connected with the waist twisting rotating seat so that the waist folding rotating seat can rotate around the axis perpendicular to the shaft II of the gearbox. And the rear axle assembly is fixedly connected with the bowing rotating seat. The tractor gearbox II shaft serves as the waist twisting center, the two bowing rotating shafts are arranged in the vertical direction, and the bowing and waist twisting requirements of a tractor with a leveled tractor body are effectively met.

Description

Technical Field

[0001] The utility model relates to the technical field of tractors, in particular to a waist-twisting and folding mechanism for a mountain articulated tractor. Background Art

[0002] China's hilly and mountainous areas are vast, mainly with undulating terrain and irregular slopes. When a tractor operates on a slope, due to the certain slope of the slope, during the operation, the body and the front / rear axles of the tractor will tilt along with the ground. When the tilt angle is relatively large, it is very easy to occur side slip, rollover, and the driver falls from the tractor. Therefore, a tractor operating on a hilly slope needs to be provided with a body leveling mechanism to ensure the safety of the tractor during slope operation.

[0003] Based on this, Chinese Patent CN117184261A discloses a tractor and its body leveling structure, wherein the body 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-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-rear direction of the tractor, wherein the front axle input shaft and the rear axle input shaft are coaxial; a body, the body 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 body; a body driving device for driving the body to rotate relative to the front axle device and the rear axle device and maintaining the horizontal attitude of the body after the body rotates to the horizontal attitude. This invention can achieve body leveling.

[0004] Based on the existing body leveling structure, how to design a folding and twisting mechanism that meets the body leveling function is a difficult problem faced by designers in this field. Among them, Chinese Patent CN116834545A discloses a folding and twisting device for a hilly and mountain tractor, which is arranged between the front box body and the rear box body of the tractor. The twisting shaft sleeve of the folding and twisting device is connected to the front box body and sleeved on the rear end of the input shaft. The folding and twisting bracket of the folding and twisting device is rotatably connected to the rear box body. The folding and twisting bracket and the twisting shaft sleeve are axially positioned relative to each other. The folding and twisting bracket can rotate relative to the twisting shaft sleeve, so that the front box body, the folding and twisting bracket and the twisting shaft sleeve can perform folding rotation relative to the rear box body, and the front box body and the twisting shaft sleeve can perform twisting rotation relative to the folding and twisting bracket and the rear box body, reducing the turning radius, improving the turning ability of the tractor, meeting the requirements of the front and rear wheels of the tractor for skewed driving on irregular roads, enabling the tractor to adapt to the complex terrain of hilly and mountainous areas, and improving the passability of the tractor on non-flat working roads. However, this twisting and folding device takes the axis parallel to the transmission shaft I of the gearbox as the twisting axis with the rotation center point of the transmission shaft I of the gearbox, and does not consider the body leveling requirement during slope operation, and it is difficult to match and apply to the body leveling structure with the transmission shaft II of the gearbox as the rotation center. At the same time, for tractors with the center point of the transmission shaft I and II of the existing drum-type articulated mechanism as the twisting center point, it is also difficult to adapt to the existing body leveling mechanism. Therefore, how to reasonably design the front axle swing mechanism of the mountain articulated tractor to achieve the overall functional design of folding, twisting and body leveling has become a technical problem urgently to be solved in this industry. Summary of the Invention

[0005] Aiming at the above deficiencies existing in the prior art, the purpose of the present invention is to provide a twisting and folding mechanism for a mountain articulated tractor to solve the problem that the existing twisting and folding mechanism of the mountain articulated tractor does not consider the body leveling requirement during slope operation and is difficult to adapt to the overall functional design of the tractor.

[0006] To solve the above technical problems, the technical solution adopted by the present invention is as follows: A twisting and folding mechanism for a mountain articulated tractor includes a gearbox and a rear axle assembly. The gearbox has a transmission shaft I and a transmission shaft II arranged parallel up and down. The rear axle assembly has a PTO power input shaft and a rear axle bevel gear input shaft; the transmission shaft I is connected to the PTO power input shaft through a shaft universal joint, and the transmission shaft II is connected to the rear axle bevel gear input shaft through a shaft universal joint; between the gearbox and the rear axle assembly, there are a twisting fixed seat, a twisting rotating seat and a folding rotating seat. Among them, the twisting fixed seat is fixedly installed at the rear end of the gearbox. The twisting rotating seat is rotatably connected to the twisting fixed seat so that it can rotate around the axis of the transmission shaft II. The folding rotating seat is rotatably connected to the twisting rotating seat so that it can rotate around the axis perpendicular to the transmission shaft II. The rear axle assembly is fixedly connected to the folding rotating seat.

[0007] As an optimization, a first U-shaped groove is provided on the lower side of the waist-twisting fixed seat, so that a front support plate and a rear support plate which are parallel to each other are formed at the lower part of the waist-twisting fixed seat. Correspondingly, the waist-twisting rotating seat includes a body and a boss formed at the front end of the body and capable of inserting into the first U-shaped groove, and a second U-shaped groove for inserting the rear support plate is formed between the boss and the body. 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 in sliding fit or clearance fit; connection holes are respectively formed on the front support plate, the boss, the rear support plate and the body, and the transmission II shaft is rotatably passed through each connection hole in sequence and then connected to the rear axle bevel gear input shaft.

[0008] As an optimization, it further includes a waist-twisting rotating shaft sleeve. The waist-twisting rotating shaft sleeve is rotatably passed through the connection holes on the front support plate, the boss, the rear support plate and the body in sequence, and a support bearing is coaxially installed in the waist-twisting rotating shaft sleeve. The transmission II shaft is arranged in the waist-twisting rotating shaft sleeve and installed on the support bearing.

[0009] As an optimization, wear-resistant bushings are respectively arranged between the hole walls of each connection hole and the waist-twisting rotating shaft sleeve.

[0010] As an optimization, two connection ears which are arranged up and down relatively are formed at the rear end of the body of the waist-twisting rotating seat. 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 connection ears through an upper folding waist rotating shaft and a lower folding waist rotating shaft. 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. Among them, 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 transmission 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 waist-twisting rotating seat. One end of the two steering cylinders is connected to the waist-twisting rotating seat, and the other ends are respectively connected to the opposite sides of the lower folding waist rotating seat.

[0011] As an optimization, a through hole is provided on the upper part of the waist-twisting fixed seat, and a through hole is provided on the body of the waist-twisting rotating seat. The transmission I shaft passes through the through hole and the through hole in sequence and then is connected to the PTO power input shaft. Among them, the through hole is an arc-shaped strip hole.

[0012] Compared with the prior art, the utility model has the following advantages:

[0013] 1) Taking the transmission II shaft of the tractor as the waist-twisting center and arranging two folding waist rotating shafts in the vertical direction can effectively solve the requirements of the fuselage leveling, folding waist and waist-twisting of the tractor.

[0014] 2) The waist-twisting fixed seat and the waist-twisting rotating seat are in an interlocking structure with good structural rigidity, which reliably connects the front and rear parts of the folding and waist-twisting tractor.

[0015] 3) This mechanism is arranged between the tractor gearbox and the rear axle housing, effectively realizing the leveling function of the main body components such as the tractor gearbox, power unit, and driving device, and meeting the special requirements of hilly terrain for tractors. Brief Description of the Drawings

[0016] Figure 1 is a structural schematic diagram of the present utility model;

[0017] Figure 2 is a three-dimensional structural schematic diagram of the present utility model;

[0018] In the figure: 1 gearbox, 2 rear axle assembly, 3 transmission shaft I, 4 transmission shaft II, 5 PTO power input shaft, 6 rear axle bevel gear input shaft, 7 universal joint for shaft I, 8 universal joint for shaft II, 9 waist-twisting fixed seat, 901 front support plate, 902 rear support plate, 10 waist-twisting rotating seat, 1001 body, 1002 boss, 1003 connecting ear, 11 waist-twisting rotating shaft sleeve, 12 support bearing, 13 wear-resistant bushing, 14 upper folding waist rotating seat, 15 lower folding waist rotating seat, 16 upper folding waist rotating shaft, 17 lower folding waist rotating shaft, 18 perforation, 19 through hole, 20 steering oil cylinder. Specific Embodiments

[0019] The present utility model will be further described below in conjunction with the drawings and embodiments.

[0020] To make the purpose, technical solutions, and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the present utility model. Obviously, the described embodiments are part of the embodiments of the present utility model, rather than all of the embodiments. Therefore, the detailed description of the embodiments of the present utility model provided in the drawings is not intended to limit the scope of the present utility model to be protected, but only represents the selected embodiments of the present utility model. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present utility model.

[0021] It should be noted that like reference numerals and letters denote like items in the following figures. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the figures, or the orientation or positional relationship in which the product of the invention is usually placed during use. These are 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 thus should not be construed as a limitation on the present invention. In addition, the terms "first", "second", "third", etc. are only used for distinguishing descriptions and should not be construed as indicating or implying relative importance. In addition, terms such as "horizontal" and "vertical" do not mean that the components are required to be absolutely horizontal or hanging, but can be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined. In the description of the present invention, it should also be noted that unless otherwise clearly specified and defined, the terms "set", "installed", "connected", "connected" 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 directly connected or indirectly connected through an intermediate medium, and can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0022] Embodiment: Refer to Figure 1 - Figure 2 , a waist-twisting and folding mechanism for a mountain articulated tractor, comprising a gearbox 1 and a rear axle assembly 2. The gearbox 1 has a gearbox shaft I 3 and a gearbox shaft II 4 arranged parallel to each other up and down. The rear axle assembly 2 has a PTO power input shaft 5 (PTO (POWER-TAKE-OFF), also called a power take-off, is a device that outputs the power of the engine to equipment other than the tractor running system and is used to connect loads such as tillage implements) and a rear axle bevel gear input shaft 6; the gearbox shaft I 3 is connected to the PTO power input shaft 5 through a shaft universal joint 7, and the gearbox shaft II 4 is connected to the rear axle bevel gear input shaft 6 through a shaft universal joint 8. The gearbox shaft II 4 and the rear axle bevel gear input shaft 6 are coaxial or the extension lines of their axes are in the same plane or intersect. Among them, the front end of the gearbox shaft II 4 sequentially passes through the gearbox 1, (transfer case), clutch housing and is connected to the front axle assembly, and the front axle assembly is installed on the clutch housing through a front axle swing structure so that it can swing around the gearbox shaft II 4. At the same time, the fuselage formed by the gearbox 1, (transfer case), clutch housing and power unit also rotates around the gearbox shaft II 4 under the control of a leveling device to achieve fuselage leveling.

[0023] A torsion waist fixing seat 9, a torsion waist rotating seat 10 and a folding waist rotating seat are provided between the transmission 1 and the rear axle assembly 2. Among them, the torsion waist fixing seat 9 is fixedly installed at the rear end of the transmission 1. The torsion waist rotating seat 10 is rotatably connected to the torsion waist fixing seat 9 so that it can rotate around the axis of the transmission II shaft 4. The folding waist rotating seat is rotatably connected to the torsion waist rotating seat 10 so that it can rotate around an axis perpendicular to the axis of the transmission II shaft 4. The rear axle assembly 2 is fixedly connected to the folding waist rotating seat. In this way, the torsion waist, the body leveling and the front axle swing of the tractor all rotate around the same axis (the transmission II shaft 4), and the structure is more reasonable and compact. This torsion waist and folding waist structure can better adapt to the existing body-leveling tractors and meet the special requirements of the hilly terrain for tractors.

[0024] Specifically, the torsion waist fixing seat 9 and the torsion waist rotating seat 10 adopt a snap connection structure. Among them, a first U-shaped groove is provided on the lower side of the torsion waist fixing seat 9, so that the lower part of the torsion waist fixing seat 9 forms parallel front support plates 901 and rear support plates 902. Correspondingly, the torsion waist rotating seat 10 includes a body 1001 and a boss 1002 formed at the front end of the body 1001 and capable of inserting into the first U-shaped groove. And there is a spacing between the boss 1002 and the body 1001 to form a second U-shaped groove for the rear support plate 902 to insert. The boss 1002 and the groove wall of the first U-shaped groove, and the rear support plate 902 and the groove wall of the second U-shaped groove are in sliding fit or clearance fit. Connecting holes are respectively formed in the front support plate 901, the boss 1002, the rear support plate 902 and the body 1001. The transmission II shaft 4 is rotatably passed through each connecting hole in sequence and then connected to the rear axle bevel gear input shaft 6.

[0025] In order to improve the strength of the connection part and protect the transmission II shaft 4, a torsion waist rotating shaft sleeve 11 is also included. The torsion waist rotating shaft sleeve 11 is rotatably passed through the connecting holes in the front support plate 901, the boss 1002, the rear support plate 902 and the body 1001 in sequence. And a support bearing 12 is coaxially installed in the torsion waist rotating shaft sleeve 11. The transmission II shaft 4 is passed through the torsion waist rotating shaft sleeve 11 and installed on the support bearing 12, so that the torsion waist rotating shaft sleeve 11 serves as the main load-bearing member to bear the load at the connection part, effectively ensuring the stable operation of the transmission II shaft 4.

[0026] In order to improve the wear resistance of the torsion waist rotating shaft sleeve 11 and the connecting holes cooperating with it, wear-resistant bushings 13 are respectively provided between the hole walls of the connecting holes and the torsion waist rotating shaft sleeve 11.

[0027] At the rear end of the body 1001 of the waist-twisting rotating seat 10, two connecting ears 1003 are formed and arranged vertically one above the other. The folding waist rotating seat includes an upper folding waist rotating seat 14 and a lower folding waist rotating seat 15. One end of the upper folding waist rotating seat 14 and one end of the lower folding waist rotating seat 15 are respectively connected to the two connecting ears 1003 through an upper folding waist rotating shaft 16 and a lower folding waist rotating shaft 17. The other end of the upper folding waist rotating seat 14 and the other end of the lower folding waist rotating seat 15 are respectively fixedly connected to the rear axle assembly 2. Among them, the upper folding waist rotating shaft 16 and the lower folding waist rotating shaft 17 are coaxially arranged and their axes are perpendicular to the axis of the transmission II shaft 4. In this embodiment, the axes of the upper folding waist rotating shaft 16 and the lower folding waist rotating shaft 17 are arranged vertically, so that the folding waist rotating seat can rotate around the axes of the upper folding waist rotating shaft 16 and the lower folding waist rotating shaft 17; on the left and right sides of the lower side of the waist-twisting rotating seat 10, steering cylinders 20 are respectively installed. One end of the two steering cylinders 20 is connected to the waist-twisting rotating seat 10, and the other ends are respectively connected to the opposite sides of the lower folding waist rotating seat 15, so that the two steering cylinders 20 can push the lower folding waist rotating seat 15 to rotate around the lower folding waist rotating shaft 17, and further enable the entire rear axle assembly 2 to rotate with the folding waist rotating seat, realizing folding of the waist.

[0028] A perforation 18 is provided in the upper part of the waist-twisting fixed seat 9. A through hole 19 is provided on the body 1001 of the waist-twisting rotating seat 10. The transmission I shaft 3 passes through the perforation 18 and the through hole 19 in sequence and is connected to the PTO power input shaft 5. Among them, the through hole 19 is an arc-shaped strip hole, so that the waist-twisting rotating seat 10 will not interfere with the transmission I shaft 3 during waist-twisting, ensuring the stability of the tractor's waist-twisting.

[0029] The present utility model:

[0030] 1) Taking the transmission II shaft of the tractor as the waist-twisting center and arranging two folding waist rotating shafts in the vertical direction effectively solves the folding and waist-twisting requirements for the body leveling of the articulated tractor.

[0031] 2) The waist-twisting fixed seat and the waist-twisting rotating seat are in a mutually buckling structure with good structural rigidity, reliably connecting the front and rear parts of the folding and waist-twisting tractor.

[0032] 3) This mechanism is arranged between the tractor transmission and the rear axle housing, effectively realizing the leveling function of the main body components of the tractor transmission, power device, driving device, etc., and meeting the special requirements of the tractor for hilly terrain.

[0033] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present utility model rather than to limit the technical solutions. Those of ordinary skill in the art should understand that any modifications or equivalent replacements made to the technical solutions of the present utility model without departing from the purpose and scope of the present technical solution shall be covered by the scope of the claims of the present utility model.

Claims

1. A waist-twisting and folding mechanism for a mountain articulated tractor, comprising a gearbox and a rear axle assembly. The gearbox has a gearbox shaft I and a gearbox shaft II arranged parallel to each other vertically. The rear axle assembly has a PTO power input shaft and a rear axle bevel gear input shaft. It is characterized in that: The first shaft of the gearbox is connected to the PTO power input shaft through a universal joint of the first shaft, and the second shaft of the gearbox is connected to the input shaft of the rear axle bevel gear through a universal joint of the second shaft; a torsion fixing seat, a torsion rotating seat and a folding rotating seat are arranged between the gearbox and the rear axle assembly. Among them, the torsion fixing seat is fixedly installed at the rear end of the gearbox, the torsion rotating seat is rotatably connected to the torsion fixing seat so that it can rotate around the axis of the second shaft of the gearbox, the folding rotating seat is rotatably connected to the torsion rotating seat so that it can rotate around an axis perpendicular to the axis of the second shaft of the gearbox, and the rear axle assembly is fixedly connected to the folding rotating seat.

2. The waist-twisting and folding mechanism of a mountain articulated tractor according to claim 1, characterized in that: A first U-shaped groove is provided on the lower side of the torsion fixing seat, so that the lower part of the torsion fixing seat forms a front support plate and a rear support plate that are parallel to each other. Correspondingly, the torsion rotating seat includes a body and a boss formed at the front end of the body and capable of inserting into the first U-shaped groove, and there is a spacing between the boss and the body to form a second U-shaped groove for the rear support plate to insert. The boss is in sliding fit or clearance fit with the groove wall of the first U-shaped groove, and the rear support plate is in sliding fit or clearance fit with the groove wall of the second U-shaped groove; connecting holes are respectively formed on the front support plate, the boss, the rear support plate and the body. The second shaft of the gearbox is rotatably passed through each connecting hole in sequence and then connected to the input shaft of the rear axle bevel gear.

3. The waist-twisting and folding mechanism of a mountain articulated tractor according to claim 2, characterized in that: It further includes a torsion rotating shaft sleeve. The torsion rotating shaft sleeve is rotatably passed through the connecting holes on the front support plate, the boss, the rear support plate and the body in sequence, and a support bearing is coaxially installed in the torsion rotating shaft sleeve. The second shaft of the gearbox is passed through the torsion rotating shaft sleeve and installed on the support bearing.

4. The waist-twisting and folding mechanism of a mountain articulated tractor according to claim 3, characterized in that: Wear-resistant bushings are respectively arranged between the hole walls of each connecting hole and the torsion rotating shaft sleeve.

5. The waist-twisting and folding mechanism of a mountain articulated tractor according to claim 2, characterized in that: Two connecting ears are formed at the rear end of the body of the torsion rotating seat and are arranged up and down opposite to each other. The folding rotating seat includes an upper folding rotating seat and a lower folding rotating seat. One end of the upper folding rotating seat and one end of the lower folding rotating seat are respectively connected to the two connecting ears through an upper folding rotating shaft and a lower folding rotating shaft. The other end of the upper folding rotating seat and the other end of the lower folding rotating seat are respectively fixedly connected to the rear axle assembly. Among them, the upper folding rotating shaft and the lower folding rotating shaft are coaxially arranged and their axes are perpendicular to the axis of the second shaft of the gearbox, so that the folding rotating seat can rotate around the axes of the upper folding rotating shaft and the lower folding rotating shaft; steering cylinders are respectively installed on the left and right sides of the lower side of the torsion rotating seat. One end of the two steering cylinders is connected to the torsion rotating seat, and the other ends are respectively connected to the opposite sides of the lower folding rotating seat.

6. The waist-twisting and folding mechanism of a mountain articulated tractor according to claim 2, characterized in that: A through hole is provided in the upper part of the torsion fixing seat, and a through hole is provided on the body of the torsion rotating seat. The first shaft of the gearbox is sequentially passed through the through hole and the through hole and then connected to the PTO power input shaft. Among them, the through hole is an arc-shaped strip hole.

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