Steering mechanism of three-wheel agricultural vehicle and tractor with steering mechanism

Abstract

The utility model relates to a three-wheel agricultural vehicle steering mechanism and a tractor with the same. The three-wheel agricultural vehicle steering mechanism comprises a bracket, a slewing bearing, a door-shaped front fork arm, a front guide wheel and two sets of steering telescopic mechanisms, the slewing bearing is installed in the bracket, the upper end of the front fork arm is fixedly connected with the lower end of a rotating disc face of the slewing bearing, the front guide wheel is installed in the front fork arm, and a wheel shaft of the front guide wheel is rotationally assembled with the two ends of the lower end of the front fork arm. The two groups of steering telescopic mechanisms are respectively arranged on the bracket and are distributed on the two sides of the slewing bearing, the telescopic ends of the two groups of steering telescopic mechanisms are respectively connected with the two sides of the upper end of the rotating disc surface of the slewing bearing, and a limiting structure for limiting the extension of the telescopic ends of the steering telescopic mechanisms is arranged at the part, corresponding to the middle of one end of the slewing bearing, on the bracket. The double-steering telescopic mechanism has the advantages that the structural design is reasonable, the double-steering telescopic mechanism is used for pushing the slewing bearing, the steering operation force is greatly reduced, the reliability of the steering structure is improved, and meanwhile a large steering angle can be achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to agricultural equipment technical field, especially a three -wheel agricultural vehicle steering mechanism and tractor with it. BACKGROUND

[0002] The front wheel steering structure of agricultural tractor mostly uses trapezoidal steering structure, makes trapezoidal steering mechanism action through steering drag link, realizes two steering wheels synchronous linkage and drives the tractor to steer. This kind of steering mechanism is only applicable to four-wheel mechanism, not applicable to single steering wheel structure. And for the front wheel guiding three -wheel motor car, steering mechanism mostly adopts vertical shaft sleeve pipe type structure, two bearings are installed between vertical shaft and sleeve pipe respectively, on the one hand, operation is not flexible, the rigidity of steering mechanism is small, under heavy load, operability and reliability decline, on the other hand, due to the axial dimension of vertical shaft sleeve pipe type structure is relatively big, cannot be used in field operation, therefore, cannot be applicable to the front steering mechanism of three -wheel tractor. For the front wheel guiding three -wheel tractor, steering structure mostly adopts rack and pinion type structure, steering gear wheel is made into an organic whole with steering shaft, when the driver rotates steering wheel, steering gear wheel rotates along, steering gear wheel meshes with steering rack, makes the rack move along the axial direction, the movement of rack is transmitted to steering knuckle arm through steering cross drag link, thereby makes the wheel deflect, realizes steering. This structure reverse efficiency is very high, when the vehicle travels on uneven road, the impact force between steering wheel and road surface will be mostly transmitted to steering wheel, causes the driver to be difficult to accurately control the automobile driving direction.

[0003] Therefore, it is necessary to develop a three -wheel agricultural vehicle steering mechanism to overcome the above technical problems. UTILITY MODEL CONTENTS

[0004] The utility model provides a three -wheel agricultural vehicle steering mechanism and tractor with it to overcome the defects of prior art.

[0005] The utility model solves the technical scheme as follows to the above technical problem:

[0006] A three -wheel agricultural vehicle steering mechanism, including bracket, slewing bearing, door type front fork arm, front guide wheel and two groups of steering telescopic mechanism, the slewing bearing is installed in the bracket, the upper end of the front fork arm is connected and fixed with the lower end of the rotary disc surface of the slewing bearing, the front guide wheel is installed in the front fork arm, and the wheel shaft is rotatably assembled with the both ends of the lower end of the front fork arm, two groups of steering telescopic mechanism are installed on the bracket respectively and are distributed on the both sides of the slewing bearing, the telescopic end of two groups of steering telescopic mechanism is connected with the both sides of the upper end of the rotary disc surface of the slewing bearing respectively, the bracket is equipped with the limiting structure for limiting the extension of the telescopic end of steering telescopic mechanism in the part corresponding to the one end of the slewing bearing.

[0007] On the basis of the above technical solutions, the utility model further can make improvement as follows.

[0008] Further, the bracket is provided with a mounting hole matched with the slewing bearing, and the main body of the slewing bearing is connected and fixed with the periphery of the mounting hole through bolts.

[0009] Further, the turning telescopic mechanism is a hydraulic cylinder.

[0010] Further, one end of the turning telescopic mechanism away from the telescopic end is provided with a spherical joint bearing, the bracket is provided with a conical stud corresponding to the spherical joint bearing, and the spherical joint bearing is rotationally assembled on the conical stud.

[0011] Further, the conical stud is provided with a lubricating oil channel, the upper end of the conical stud is provided with an oil nozzle in communication with the lubricating oil channel, and the oil nozzle is used for injecting lubricating oil into the spherical joint bearing.

[0012] Further, the conical stud penetrates through the matched through hole of the bracket from top to bottom, and the lower end is fixed through the locking nut screwed therewith.

[0013] Further, the upper end of the rotating disc surface of the slewing bearing is vertically provided with a turning column on both sides, the telescopic end of the turning telescopic mechanism is provided with an assembly bearing, and the assembly bearing is assembled on the turning column.

[0014] Further, the limiting structure comprises a limiting block, the limiting block is fixed on the bracket through bolts, and one end of the limiting block extends to above the middle of one end edge of the rotating disc surface of the slewing bearing.

[0015] Further, the rotating disc surface of the slewing bearing is provided with a vertical downward extending positioning pin shaft, the upper end of the front fork arm is provided with a positioning hole corresponding to the positioning pin shaft, and the positioning pin shaft is inserted into the corresponding positioning hole.

[0016] The utility model has the advantages of reasonable structure design, using double turning telescopic mechanism to push the slewing bearing mode, greatly reducing the turning operation force, improving the reliability of the turning structure, and realizing large turning angle.

[0017] Also provided is a three-wheeled tractor, comprising a three-wheeled agricultural vehicle turning mechanism. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 FIG. 1 is a structural schematic view of the three-wheeled agricultural vehicle turning mechanism of the utility model;

[0019] Figure 2 FIG. 2 is a structural top view of the three-wheeled agricultural vehicle turning mechanism of the utility model.

[0020] In the accompanying drawings, the components represented by the reference numerals are as follows:

[0021] 1. Bracket; 2. Slewing bearing; 3. Front fork arm; 4. Front guide wheel; 5. Steering telescopic mechanism; 6. Limiting structure; 11. Conical stud; 12. Oil nozzle; 21. Steering column; 22. Dowel pin; 51. Spherical joint bearing; 52. Assembly bearing; 111. Lock nut. DETAILED DESCRIPTION

[0022] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0023] Example 1

[0024] like Figure 1 As shown, the steering mechanism of the three-wheeled agricultural machinery vehicle of this embodiment includes a bracket 1, a slewing bearing 2, a gate-type front fork arm 3, a front guide wheel 4 and two sets of steering telescopic mechanisms 5. The above-mentioned slewing bearing 2 is installed in the above-mentioned bracket 1, and the upper end of the above-mentioned front fork arm 3 is connected and fixed to the lower end of the rotating disk of the above-mentioned slewing bearing 2. The above-mentioned front guide wheel 4 is installed in the above-mentioned front fork arm 3, and its wheel axle is rotatably assembled with the two ends of the lower end of the above-mentioned front fork arm 3. The two sets of the above-mentioned steering telescopic mechanisms 5 are respectively installed on the above-mentioned bracket 1 and distributed on both sides of the above-mentioned slewing bearing 2. The telescopic ends of the two sets of the above-mentioned steering telescopic mechanisms 5 are respectively connected to both sides of the upper end of the rotating disk of the above-mentioned slewing bearing 2. A limiting structure 6 for limiting the extension of the telescopic end of the above-mentioned steering telescopic mechanism 5 is provided at the middle position of one end of the above-mentioned slewing bearing 2 on the above-mentioned bracket 1.

[0025] The use process of the steering mechanism of the three-wheeled agricultural machinery vehicle of this embodiment is as follows:

[0026] When steering begins, one set of steering and telescopic mechanisms 5 pushes the rotating disk of the slewing bearing 2 to rotate, while the other set pulls the rotating disk of the slewing bearing 2. The rotation of the rotating disk of the slewing bearing 2 drives the front fork arm 3 connected to it to rotate, thereby driving the front guide wheel 4 to achieve left / right steering. Furthermore, when the slewing bearing 2 rotates to the desired angle, the telescopic end of the steering and telescopic mechanism 5 contacts the limit structure 6, achieving mechanical limit. This protects the steering and telescopic mechanism 5 from damage caused by frequent limit changes in its own telescopic travel, extending its service life and enhancing its reliability. Overall, the structural design is rational, and the use of dual steering and telescopic mechanisms to drive the slewing bearing significantly reduces steering operating force, improves the reliability of the steering structure, and simultaneously enables large steering angles.

[0027] In the embodiment, the bracket 1 is provided with a mounting hole matched with the rotary support 2, and the main body of the rotary support 2 is fixedly connected with the periphery of the mounting hole by bolts. Specifically, the rotary support 2 is arranged at the lower end of the mounting hole, and the main body of the rotary support 2 is provided with a flange ring which is fixedly connected with the bracket 1 by bolts vertically penetrating the flange ring.

[0028] In the embodiment, the turning telescopic mechanism 5 is a hydraulic cylinder of a matched model.

[0029] As a preferred embodiment, one end of the turning telescopic mechanism 5 away from the telescopic end is provided with a spherical joint bearing 51, the bracket 1 is provided with a conical stud 11 matched with the spherical joint bearing 51, and the spherical joint bearing 51 is rotatably arranged on the conical stud 11.

[0030] In the embodiment, the turning telescopic mechanism 5 is arranged on the conical stud 11 of the bracket 1 through the spherical joint bearing 51, which can realize the angular deviation of the turning telescopic mechanism 5 during the rotation of the rotary disc surface of the rotary support 2, and the deviation is flexible.

[0031] In the embodiment, the conical stud 11 is provided with a lubricating oil channel, the upper end of the conical stud 11 is provided with an oil nozzle 12 in communication with the lubricating oil channel, and the oil nozzle 12 is used for injecting lubricating oil into the spherical joint bearing 51. The flow channel is arranged in the conical stud 11 and connected with the oil nozzle 12, and the structure is compactly arranged, which effectively saves the space for the arrangement of the lubricating oil channel.

[0032] In the embodiment, the conical stud 11 penetrates the matched through hole of the bracket 1 from top to bottom, and the lower end is fixed by a locking nut 111 screwed with the lower end. This design facilitates the quick disassembly and assembly of the conical stud 11.

[0033] As a preferred embodiment, the upper end of the rotary disc surface of the rotary support 2 is vertically provided with a turning column 21 on both sides, the telescopic end of the turning telescopic mechanism 5 is provided with an assembly bearing 52, and the assembly bearing 52 is arranged on the turning column 21.

[0034] In the embodiment, the telescopic end of the turning telescopic mechanism 5 is connected with the turning column 21 on the rotary disc surface through the assembly bearing 52, and the two can rotate relative to each other, so that the turning telescopic mechanism 5 has good rotation performance when driving the rotary disc surface to rotate. The assembly bearing 52 is a spherical joint bearing of a matched model.

[0035] In the embodiment, the limiting structure 6 includes a limiting block which is fixed to the bracket 1 by bolts, and one end of the limiting block extends to above the middle of one end edge of the rotary disc surface of the rotary support 2. The limiting structure 6 is simple in design and easy to assemble.

[0036] In the embodiment, the rotating disc surface of the slewing bearing 2 is provided with a vertical downward extending positioning pin shaft 22, the upper end of the front fork arm 3 is provided with a positioning hole corresponding to the positioning pin shaft 22, and the positioning pin shaft 22 is inserted into the corresponding positioning hole. The positioning pin shaft 22 facilitates the positioning of the rotating disc surface and the front fork arm 3, and then the fixed bolt penetrating through the bracket 1 is threadedly connected and fixed with the rotating disc surface, so that the front fork arm 3 and the rotating disc surface are precisely positioned and assembled.

[0037] Embodiment 2

[0038] The three-wheeled tractor of the embodiment comprises the three-wheeled agricultural vehicle steering mechanism in the embodiment 1.

[0039] In the description of the utility model, it is understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, and therefore cannot be understood as indicating or implying that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the utility model.

[0040] In addition, the terms "first" and "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first" and "second" can explicitly or implicitly include at least one of the features. In the description of the utility model, the meaning of "multiple" is at least two, for example, two, three, etc., unless otherwise specifically limited.

[0041] In the utility model, unless otherwise specifically defined and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship of two elements, unless otherwise specifically limited. For ordinary skilled persons in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0042] In the present application, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature, which can be direct contact between the first and second features, or indirect contact through an intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature can be directly above or obliquely above the first feature, or only indicate that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature can be directly below or obliquely below the first feature, or only indicate that the horizontal height of the first feature is less than that of the second feature.

[0043] In the description of the present application, the description of the terms "one embodiment", "some embodiments", "example", "specific example" or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present application, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or features of different embodiments or examples described in the present application without contradiction.

[0044] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limiting the present application, and those skilled in the art can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A steering mechanism for a three-wheeled agricultural vehicle, characterized in that: The invention comprises a bracket (1), a slewing bearing (2), a gate-shaped front fork arm (3), a front guide wheel (4) and two groups of steering telescopic mechanisms (5), wherein the slewing bearing (2) is installed in the bracket (1), the upper end of the front fork arm (3) is connected and fixed to the lower end of the rotating disk of the slewing bearing (2), the front guide wheel (4) is installed in the front fork arm (3), and its wheel axle is rotatably assembled with the two ends of the lower end of the front fork arm (3), the two groups of steering telescopic mechanisms (5) are respectively installed on the bracket (1) and distributed on both sides of the slewing bearing (2), the telescopic ends of the two groups of steering telescopic mechanisms (5) are respectively connected to both sides of the upper end of the rotating disk of the slewing bearing (2), and a limiting structure (6) for limiting the extension of the telescopic end of the steering telescopic mechanism (5) is provided at a position corresponding to the middle of one end of the slewing bearing (2) on the bracket (1).

2. A steering mechanism for a three-wheeled agricultural vehicle according to claim 1, characterized in that: The bracket (1) is provided with a mounting hole adapted to the slewing support (2), and the main body of the slewing support (2) is connected and fixed to the periphery of the mounting hole by means of bolts.

3. The steering mechanism of a three-wheeled agricultural vehicle according to claim 1, characterized in that: The steering telescopic mechanism (5) is a hydraulic cylinder.

4. A steering mechanism for a three-wheeled agricultural vehicle according to claim 3, characterized in that: A spherical joint bearing (51) is provided at one end of the steering telescopic mechanism (5) away from the telescopic end, and a conical stud (11) corresponding to the spherical joint bearing (51) is provided on the bracket (1), and the spherical joint bearing (51) is rotatably assembled on the conical stud (11).

5. The steering mechanism for a three-wheeled agricultural vehicle according to claim 4, characterized in that: A lubricating oil passage is provided in the conical stud (11), and an oil nozzle (12) communicating with the lubricating oil passage is provided at the upper end of the conical stud (11). The oil nozzle (12) is used to inject lubricating oil into the spherical joint bearing (51).

6. The steering mechanism for a three-wheeled agricultural vehicle according to claim 4, characterized in that: The conical stud (11) passes through the adapted through hole on the bracket (1) from top to bottom, and the lower end is fixed by a locking nut (111) screwed therewith.

7. The steering mechanism for a three-wheeled agricultural vehicle according to claim 3, characterized in that: Steering columns (21) are vertically provided on both sides of the upper end of the rotating disk of the slewing support (2), and the telescopic end of the steering telescopic mechanism (5) is equipped with an assembly bearing (52), and the assembly bearing (52) is assembled on the steering column (21).

8. The steering mechanism for a three-wheeled agricultural vehicle according to claim 1, characterized in that: The limiting structure (6) includes a limiting block, which is fixed to the bracket (1) by bolts, and one end of the limiting block extends to the upper middle portion of one end edge of the rotating disk of the slewing support (2).

9. A steering mechanism for a three-wheeled agricultural vehicle according to any one of claims 1 to 8, characterized in that: The rotating disk of the slewing support (2) is provided with a positioning pin (22) extending vertically downward, and the upper end of the front fork arm (3) is provided with a positioning hole corresponding to the positioning pin (22), and the positioning pin (22) is inserted into the corresponding positioning hole.

10. A three-wheel tractor, characterized by: It comprises a steering mechanism for a three-wheeled agricultural vehicle as described in any one of claims 1 to 9.

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