Steering device for tractor and tractor

Abstract

The utility model provides a steering device for a tractor and the tractor. Comprising a steering wheel, a first tubular column, a second tubular column, a universal joint assembly, a third tubular column and an electric control steering assembly which are sequentially arranged, and the electric control steering assembly drives a motor of a steering output shaft to rotate. The electric control steering assembly is arranged on the steering column and located on the side away from the steering wheel, the electric control steering assembly can be arranged in a hood of the tractor in a hidden mode, and the situation that the height of the steering wheel is increased due to the fact that a steering wheel motor is additionally arranged, and consequently the driving experience of a driver is affected is avoided; and in a common driving mode, the electric control steering assembly can also play a role in assisting power, so that the operation resistance of the steering wheel is reduced. The whole steering device is simple in structure, compact in connection and easy to install.

Description

Technical Field

[0001] The utility model relates to the technical field of agricultural machinery electric control, in particular to a steering device for a tractor and a tractor. Background Art

[0002] With the promotion of agricultural modernization, the modernization of machinery has become a development focus. More and more assisted driving scenarios are used in tractor operations, and one of the core components of assisted driving is the electronic steering system. In the field of tractors, the electronic steering system mainly includes the following two methods. One is to generally arrange the electronic control device at one end of the steering wheel, that is, to integrate the steering wheel motor on the steering wheel, but this will cause the height of the entire steering wheel to increase, which not only affects the overall appearance, but also when the assisted driving is not used, the motor itself has a relatively large resistance, which affects the driving feel. The second is to arrange the electronic steering gear at one end of the steering wheel hydraulic steering assembly, that is, to use a full hydraulic steering gear, and control the steering hydraulic oil circuit through an electronically controlled proportional valve. The assisted driving controller controls the electronically controlled hydraulic proportional reversing valve according to the predetermined path to achieve left or right turn, but the electronically controlled proportional valve only works in the assisted driving stage. In normal driving mode, the electronically controlled steering gear cannot play the role of electric power assistance.

[0003] Therefore, it is necessary to provide a steering device for a tractor to overcome the above-mentioned defects. Utility Model Content

[0004] The utility model aims to provide a steering device for a tractor and a tractor.

[0005] According to one aspect of the utility model, a steering device for a tractor is provided, comprising: a steering wheel; a first pipe column, the upper end of which is connected to the steering wheel via a first spline; a second pipe column, which is located below the first pipe column; a universal joint assembly, which is fixedly mounted on a hood of the tractor, the two ends of which are respectively connected to the upper end of the second pipe column and the lower end of the first pipe column, and which can adjust the angle of the first pipe column relative to the second pipe column; a third pipe column, which is located below the second pipe column; an electronically controlled steering assembly, which comprises a steering output shaft, the two ends of which are respectively connected to the lower end of the second pipe column and the upper end of the third pipe column, and a motor for driving the steering output shaft to rotate.

[0006] Preferably, the lower end of the third pipe column is connected to the hydraulic steering gear through a second spline.

[0007] Preferably, the steering output shaft is transmission-connected to the motor via a worm gear structure.

[0008] Preferably, the electric control steering assembly further includes a sensor, which can acquire the torque and / or steering angle of the second pipe column relative to the casing outside the second pipe column, and transmit the detection data to the control unit of the motor.

[0009] Preferably, a first casing is sleeved outside the first pipe column, a second casing is sleeved outside the second pipe column, and a third casing is sleeved outside the third pipe column.

[0010] Preferably, the universal joint assembly includes an upper fork arm, a lower fork arm and a universal joint. The upper fork arm is fixedly connected to the lower end of the first casing, the lower fork arm is fixedly connected to the upper end of the second casing. The lower fork arm and the upper fork arm are rotatably connected and symmetrically arranged to form an accommodating space. The universal joint is located in the accommodating space. One end of the universal joint is connected to the first pipe column, and the other end of the universal joint is connected to the second pipe column.

[0011] Preferably, the universal joint assembly further includes a pin shaft, a locking nut and a handle. The pin shaft sequentially passes through the through holes on the side walls of the upper fork arm and the lower fork arm. The through holes on the side wall of the upper fork arm are all arc-shaped structures. One end of the pin shaft is fixed to the side wall of the upper fork arm or the lower fork arm. The other end of the pin shaft protrudes outside the side wall of the upper fork arm or the lower fork arm and is screwed with a locking nut. The handle is integrally rotated with the locking nut to realize the locking of the locking nut.

[0012] Preferably, a limiting rod is further arranged on the side wall of the upper fork arm or the lower fork arm. The limiting rod is located on the movement track of the handle to limit the movement stroke of the handle. A sleeve is further arranged in the accommodating space, and the sleeve is sleeved on the pin shaft.

[0013] Preferably, the third casing is fixedly installed on the driving part of the tractor through a connecting seat.

[0014] Preferably, the second pipe column, the electric control steering assembly and the third pipe column are all arranged inside the engine hood of the tractor; the universal joint assembly and the first pipe column are arranged outside the engine hood of the tractor.

[0015] According to another aspect of the present invention, a tractor is provided, including the steering device for the tractor described above.

[0016] Compared with the prior art, the steering device for the tractor and the tractor provided by the present invention have the following

[0017] Beneficial effects:

[0018] In the present utility model, the electric control steering assembly is arranged on the steering column and on the side far from the steering wheel, and can be hidden inside the engine hood of the tractor, avoiding the situation that the height of the steering wheel increases due to the installation of the steering wheel motor, thus affecting the driving experience of the driver; moreover, in the normal driving mode, the electric control steering assembly can also play an auxiliary power assist role, reducing the operating resistance of the steering wheel. The structure of the entire steering device is simple, the connection is compact, and it is easy to install. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0020] Figure 1 It is a schematic installation diagram of the steering device in the present utility model.

[0021] Figure 2 It is a schematic cross-sectional view of the steering device in the present utility model.

[0022] Figure 3 It is an exploded schematic view of the universal joint assembly in the present utility model.

[0023] Figure 4 It is a cross-sectional view of the electric control steering assembly in the present utility model.

[0024] Description of the reference numerals in the drawings: 1a, the first pipe column; 1b, the first sleeve; 11, the first spline; 2, the universal joint assembly; 21, the lower fork arm; 211, the lower support plate; 212, the first connecting plate; 213, the second connecting plate; 214, the mounting plate; 215, the through hole; 22, the upper fork arm; 221, the upper support plate; 222, the third connecting plate; 223, the fourth connecting plate; 224, the through hole; 23, the universal joint; 24, the pin shaft; 25, the locking nut; 26, the handle; 27, the limiting rod; 28, the sleeve; 3a, the second pipe column; 3b, the second sleeve; 4, the electric control steering assembly; 41, the housing; 42, the motor; 43, the worm; 44, the bearing; 45, the turbine; 46, the steering output shaft; 5a, the third pipe column; 5b, the third sleeve; 51, the second spline; 6, the steering wheel; 7, the hydraulic steering gear. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0026] For the sake of simplicity of the drawings, only the parts related to the present utility model are schematically shown in each figure, and they do not represent the actual structure of the product. In addition, for the sake of simplicity and easy understanding of the drawings, in some figures, for components with the same structure or function, only one of them is schematically shown, or only one of them is labeled. In this article, "one" not only means "only this one", but also can mean the case of "more than one".

[0027] It should also be further understood that the term "and / or" used in the description of the present application and the appended claims refers to any combination and all possible combinations of one or more of the related listed items, and includes these combinations.

[0028] In this article, it should be noted that unless otherwise clearly defined and limited, the terms "installation", "connection", and "coupling" 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 it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0029] In addition, in the description of the present application, the terms "first", "second", etc. are only used for distinguishing descriptions and cannot be understood as indicating or implying relative importance.

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the specific embodiments of the present utility model will be described below with reference to the drawings. Obviously, the drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained according to these drawings, and other embodiments can also be obtained.

[0031] See Figures 1 to 4 , the present utility model discloses a steering device for a tractor, which is applied to agricultural machinery such as tractors. The steering device includes: a first pipe column 1a, a universal joint assembly 2, a second pipe column 3a, an electric control steering assembly 4, and a third pipe column 5a.

[0032] The upper end of the first pipe column 1a is connected to the steering wheel 6 through a first spline 11. A first sleeve 1b is sleeved outside the first pipe column 1a. The first pipe column 1a and the first sleeve 1b are connected by a bearing, and the first pipe column 1a can rotate relative to the first sleeve 1b. The upper end of the second pipe column 3a is connected to the lower end of the first pipe column 1a through a universal joint assembly 2. A second sleeve 3b is sleeved outside the second pipe column 3a. The second pipe column 3a and the second sleeve 3b are connected by a bearing, and the second pipe column 3a can rotate relative to the second sleeve 3b. The universal joint assembly 2 is fixedly installed on the hood of the tractor and can adjust the angle of the first pipe column 1a relative to the second pipe column 3a. The upper end of the third pipe column 5a is connected to the lower end of the second pipe column 3a through an electric control steering assembly 4, so that the electric control steering assembly 4 is far away from the steering wheel 6. The lower end of the third pipe column 5a is connected to the hydraulic steering gear 7 assembly through a second spline 51. A third sleeve 5b is sleeved outside the third pipe column 5a. The third pipe column 5a and the third sleeve 5b are connected by a bearing, and the third pipe column 5a can rotate relative to the third sleeve 5b.

[0033] Refer to Figure 3 , the universal joint assembly 2 includes a lower fork arm 21 and an upper fork arm 22 symmetrically and fittingly arranged, and a universal joint 23 located in the accommodation space formed by the lower fork arm 21 and the upper fork arm 22. The lower fork arm 21 includes a lower support plate 211 fixedly connected to the upper end of the second sleeve 3b. On both sides of the lower support plate 211, a first connecting plate 212 and a second connecting plate 213 are bent upward respectively, so that the overall shape of the lower fork arm 21 is a U-shaped structure.

[0034] In addition, an installation plate 214 is bent downward from the lower support plate 211, and the installation plate 214 is fixedly connected to the hood of the tractor. The second sleeve 3b, the electric control steering assembly 4 and the third sleeve 5b are all arranged inside the hood of the tractor, and the universal joint assembly 2 and the first sleeve 1b are arranged outside the hood of the tractor. Hiding the electric control steering assembly 4 inside the hood of the tractor avoids the situation that the height of the steering wheel 6 becomes larger due to the installation of the steering wheel motor, thus affecting the driving experience of the driver.

[0035] The upper fork arm 22 includes an upper support plate 221 fixedly connected to the lower end of the first sleeve 1b. On both sides of the upper support plate 221, a third connecting plate 222 and a fourth connecting plate 223 are bent downward respectively, so that the overall shape of the upper fork arm 22 is a U-shaped structure. Among them, the third connecting plate 222 is located inside the first connecting plate 212 and is rotatably connected to the first connecting plate 212, and the fourth connecting plate 223 is located inside the first connecting plate 212 and is rotatably connected to the second connecting plate 213. The universal joint 23 is a conventional cross coupling. One end of the universal joint 23 is connected to the first pipe column 1a, and the other end of the universal joint 23 is connected to the second pipe column 3a to realize torque transmission, and its structure will not be described in detail.

[0036] To achieve the locking effect on the universal joint assembly 2, a pin shaft 24 is provided between the first connecting plate 212 and the second connecting plate 213, and a locking nut 25 is provided at one end of the pin shaft 24. Specifically, the pin shaft 24 sequentially passes through the through hole 215 of the first connecting plate 212, the arc-shaped through hole 224 of the third connecting plate 222, the arc-shaped through hole 224 of the fourth connecting plate 223, and the through hole 215 of the second connecting plate 213. One end of the pin shaft 24 is fixedly installed on the first connecting plate 212, and the other end of the pin shaft 24 protrudes outside the second connecting plate 213; the locking nut 25 is arranged on the second connecting plate 213 and is threadedly connected to the pin shaft 24 and can move axially along the pin shaft 24.

[0037] After the angle adjustment of the first pipe column 1a and the second pipe column 3a is completed, the user tightens the locking nut 25 until the first connecting plate 212 and the third connecting plate 222 are in contact with each other, and the second connecting plate 213 and the fourth connecting plate 223 are in contact with each other, realizing double-sided locking. Since the through holes 215 of the third connecting plate 222 and the fourth connecting plate 223 are arc-shaped structures, it will not affect the relative rotation of the upper fork arm 22 and the lower fork arm 21. To avoid excessive deformation of the first connecting plate 212, the third connecting plate 222, the second connecting plate 213, and the fourth connecting plate 223, the universal joint assembly 2 further includes a sleeve 28. The sleeve 28 is sleeved on the pin shaft 24 and is located between the third connecting plate 222 and the fourth connecting plate 223.

[0038] To facilitate the operation of the universal joint assembly 2, the universal joint assembly 2 further includes a handle 26 and a limiting rod 27. The handle 26 rotates integrally with the locking nut 25. The limiting rod 27 is installed on the second connecting plate 213 and is located on the movement track of the handle 26 to limit the movement stroke of the handle 26. The user can operate the locking nut 25 through the handle 26, improving the convenience of the entire locking process. In addition, the setting of the limiting rod 27 can prevent the handle 26 from interfering with the instrument panel above the engine hood during operation.

[0039] Refer to the appendix Figure 4 As shown, the electric control steering assembly 4 includes a housing 41, a motor 42, a worm 43, and a turbine 45. The housing 41 is fixedly installed on the second sleeve 3b and the third sleeve 5b. The motor 42 is arranged inside the housing 41. Both ends of the worm 43 are arranged inside the housing 41 through bearings 44 and rotate integrally with the output shaft of the motor 42; the turbine 45 meshes with the worm 43, and a steering output shaft 46 is provided at the center of the turbine 45. Both ends of the steering output shaft 46 are respectively connected to the second pipe column 3a and the third pipe column 5a. In the assisted driving mode, it completely relies on the motor 42 to drive the worm 43 to rotate, and then drives the second pipe column 3a and the third pipe column 5a to rotate, thereby realizing the automatic control of the hydraulic steering gear 7 assembly.

[0040] The electric power steering assembly 4 further includes a sensor. The sensor is disposed on the housing 41 and can acquire the torque and / or steering angle of the second column 3a relative to the sleeve outside the second column 3a, and transmit the detection data to the control unit of the motor 42. In the normal driving mode, when the user operates the steering wheel 6, the sensor acquires the torque and / or steering angle of the second column 3a relative to the second sleeve 3b, and the controller reasonably controls the output torque and speed of the motor 42 according to the detected parameters to achieve the power assistance for the steering wheel 6 and improve the user experience.

[0041] It will be apparent to those skilled in the art that various modifications and variations can be made to the above exemplary embodiments of the present invention without departing from the spirit and scope of the present invention. Accordingly, it is intended that the present invention cover modifications and variations of the present invention falling within the scope of the appended claims and their equivalent technical solutions.

Claims

1. A steering device for a tractor, characterized in that: include: steering wheel; A first tube column, wherein an upper end of the first tube column is connected to the steering wheel via a first spline; a second pipe column, the second pipe column being located below the first pipe column; A universal joint assembly, wherein the universal joint assembly is fixedly mounted on the hood of the tractor, and the two ends of the universal joint assembly are respectively connected to the upper end of the second pipe column and the lower end of the first pipe column, and the angle of the first pipe column relative to the second pipe column can be adjusted; a third pipe column, the third pipe column being located below the second pipe column; The electronically controlled steering assembly comprises a steering output shaft whose two ends are respectively connected to the lower end of the second column and the upper end of the third column, and a motor driving the steering output shaft to rotate.

2. The tractor steering device according to claim 1, wherein: The lower end of the third pipe column is connected to the hydraulic steering gear through a second spline.

3. The tractor steering device according to claim 1, wherein: The steering output shaft is connected to the motor via a worm gear structure.

4. The tractor steering device according to claim 3, characterized in that: The electronically controlled steering assembly further comprises a sensor, which is capable of acquiring the torque and / or steering angle of the second column relative to the sleeve outside the second column, and transmitting the detection data to the control unit of the motor.

5. The tractor steering device according to claim 1, wherein: The outer shell of the first pipe column is provided with a first casing, the outer shell of the second pipe column is provided with a second casing, and the outer shell of the third pipe column is provided with a third casing.

6. The tractor steering device according to claim 5, characterized in that: The universal joint assembly includes an upper fork arm, a lower fork arm and a universal joint, the upper fork arm is fixedly connected to the lower end of the first sleeve, the lower fork arm is fixedly connected to the upper end of the second sleeve, the lower fork arm and the upper fork arm are rotatably connected and symmetrically arranged to form an accommodating space, the universal joint is located in the accommodating space, one end of the universal joint is connected to the first pipe column, and the other end of the universal joint is connected to the second pipe column.

7. The tractor steering device according to claim 6, wherein: The universal joint assembly also includes a pin, a locking nut and a handle, the pin passes through the through holes located on the side walls of the upper fork arm and the lower fork arm in sequence, and the through holes on the side walls of the upper fork arm are all arc-shaped structures; one end of the pin is fixed to the side wall of the upper fork arm or the lower fork arm, and the other end of the pin protrudes from the outside of the side wall of the upper fork arm or the lower fork arm and is threaded with a locking nut, and the handle rotates with the locking nut as a whole to achieve the locking of the locking nut.

8. The tractor steering device according to claim 7, wherein: The side wall of the upper fork arm or the lower fork arm is also provided with a limit rod, and the limit rod is located on the movement trajectory of the handle to limit the movement stroke of the handle; a sleeve is also provided in the accommodating space, and the sleeve is sleeved on the pin shaft.

9. The tractor steering device according to claim 6, wherein: The second sleeve, the electric-controlled steering assembly and the third sleeve are arranged in the hood of the tractor.

10. A tractor, characterized in that: A tractor steering device comprising the steering device according to any one of claims 1 to 9.

Images