Tractor steering column

Abstract

The utility model provides a tractor steering column which comprises a first main shaft, a second main shaft, a third main shaft and an installation support, the upper portion of the second main shaft is connected with the lower portion of the first main shaft through a spline, and the lower end of the second main shaft is connected with the third main shaft through a universal joint. The upper portion of the first main shaft is connected with an outer pipe through a first bearing, the lower portion of the second main shaft is connected with an inner pipe through a second bearing, the outer pipe is connected with the inner pipe in a sliding mode, the lower end of the inner pipe is hinged to the installation support, and a hinged shaft right faces the universal joint. According to the utility model, the first main shaft can be axially adjusted relative to the second main shaft along the spline, and the outer pipe can slide along with the first main shaft; the angle of the inner pipe can be adjusted around the universal joint along with the second main shaft; length adjustment and angle adjustment of the steering column can be achieved at the same time, flexibility is good, and operation comfort is good. And the first bearing and the second bearing improve stability, control precision is high, and quietness is good.

Description

Technical Field

[0001] The utility model relates to the technical field of tractor steering systems, in particular to a tractor steering column. Background Art

[0002] The tractor steering column is an important component in the tractor steering system, mainly used to transmit the driver's steering operation. The tractor steering column is usually connected to the steering wheel at one end and the steering knuckle at the other end through the intermediate shaft. The steering knuckle is connected to the front wheel through the steering tie rod. When the steering wheel is turned, the power is transmitted along the steering column, the intermediate shaft and the steering knuckle in sequence. The steering knuckle drives the steering tie rod, and the steering tie rod pulls the front wheel to rotate a certain range, thereby controlling the steering angle of the front wheel.

[0003] At present, the steering column of tractors on the market generally includes an upper half shaft and a lower half shaft, between which a universal joint is arranged, and the upper half shaft sleeve has a protective outer tube, which can be adjusted along with the upper half shaft around the universal joint for angle adjustment, but the length of the steering column cannot be adjusted at the same time. At the same time, due to the gap between the protective outer tube and the upper half shaft, the upper half shaft shakes during operation, which is not comfortable enough; in addition, too large a gap will also cause vibration, increased noise, reduced precision and other problems. Utility Model Content

[0004] The technical problem to be solved by the utility model is: how to achieve the length adjustment of the steering column and improve the operating comfort at the same time.

[0005] The technical solution of the utility model to solve the above technical problems is as follows:

[0006] The utility model provides a tractor steering column, comprising a first main shaft, a second main shaft, a third main shaft and a mounting bracket, wherein the upper part of the second main shaft is connected to the lower part of the first main shaft through a spline, and the lower end of the second main shaft is connected to the third main shaft through a universal joint; the upper part of the first main shaft is connected to an outer tube through a first bearing, the lower part of the second main shaft is connected to an inner tube through a second bearing, the outer tube is slidably connected to the inner tube, the lower end of the inner tube is hinged on the mounting bracket and the hinge shaft faces the universal joint.

[0007] The beneficial effects of the utility model are:

[0008] With the utility model, the first spindle can be axially adjusted relative to the second spindle along the spline, and the outer tube can slide with the first spindle; the inner tube can be angle-adjusted around the universal joint with the second spindle; the steering column can be adjusted in length and angle at the same time, with good flexibility and comfortable operation. In addition, the outer tube and the inner tube can protect the cleanliness of the spindle; the first bearing and the second bearing bear the radial force of the upper part of the first spindle and the lower part of the second spindle respectively, and the overall stability of the first spindle and the second spindle is good, avoiding the shaking of the steering wheel and the collision of the spindle with the outer tube, improving the control accuracy, and good quietness; at the same time, the radial force is evenly distributed, avoiding stress concentration between the spindle and the inner tube or the outer tube, reducing wear and extending the service life.

[0009] On the basis of the above technical solution, the present invention can also be improved as follows.

[0010] Furthermore, a locking bolt handle is also provided on the outer tube, and the locking bolt handle is inserted into the outer tube and abuts against the inner tube.

[0011] When the length adjustment is completed, the inner tube is pressed against the locking bolt handle to restrict the outer tube from sliding relative to the inner tube, thereby facilitating locking of the length.

[0012] Furthermore, a locking seat is provided on the outer tube, and the locking bolt handle is connected to the locking seat through threads.

[0013] It is convenient to increase the thread length, prevent the locking bolt handle from loosening, and has a good locking effect.

[0014] Furthermore, the outer tube and the inner tube are connected via a spline.

[0015] It is convenient to constrain the outer tube and prevent the outer tube from rotating with the first main axis, so that the direction of the locking bolt handle is stable, and at the same time, it is avoided to affect the locking force of the locking bolt handle.

[0016] Furthermore, the lower part of the first main shaft is a cylindrical section, which is sleeved on the second main shaft and connected to the second main shaft through a spline.

[0017] The installation is convenient, the spline overlap length between the first spindle and the second spindle is guaranteed, and the transmission reliability is good.

[0018] Furthermore, the lower end of the cylindrical section extends into the inner tube and forms a transition fit, and the upper end of the inner tube extends into the outer tube and forms a transition fit.

[0019] Through the mutual restraint between the cylindrical section, the inner tube and the outer tube, the gap at the overlapping part of the outer tube and the inner tube is reduced to avoid shaking; at the same time, the length adjustment resistance is increased, the locking force requirement is small, the locking is convenient, and the stability is good.

[0020] Furthermore, the first bearing and the second bearing are deep groove ball bearings.

[0021] Furthermore, at least two second bearings are provided.

[0022] The deep groove ball bearing can bear part of the axial force, making it easier for the first main shaft to drive the outer cylinder to move axially; it is easier to increase the radial force bearing capacity of the inner cylinder and has good stability.

[0023] Furthermore, it also includes a pneumatic spring, one end of which is hinged on the mounting bracket, and the other end of which is hinged on the inner tube; the pneumatic spring is a self-locking pneumatic spring.

[0024] When the pneumatic spring is unlocked, the inner cylinder can move relative to the mounting bracket; when the angle adjustment is completed, the pneumatic spring self-locks to constrain the movement of the inner cylinder relative to the mounting bracket to achieve angle locking; it is easy to adjust the angle and easy to operate.

[0025] Furthermore, a hinge seat is provided at the lower end of the inner cylinder, the upper end of the pneumatic spring is hinged on the hinge seat, and the lower end of the pneumatic spring is hinged on the mounting bracket.

[0026] It is convenient to provide installation space for the pneumatic spring and avoid structural interference between the pneumatic spring and each main shaft.

[0027] Furthermore, the lower end of the third main shaft is also connected to an output shaft via a flange.

[0028] The output shaft can be used to connect the steering mechanism; the flange connection makes it easy to replace the output shaft separately according to the wear condition, reducing maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a structural schematic diagram of the utility model.

[0030] Figure 2 It is a front view of the utility model.

[0031] Figure 3 for Figure 2 AA section view.

[0032] Figure 4 for Figure 3 External view of the.

[0033] In the accompanying drawings, the technical features represented by the reference numerals are as follows:

[0034] 1-first main shaft; 2-second main shaft; 3-third main shaft; 4-outer tube; 5-inner tube; 6-universal joint; 7-mounting bracket; 8-first bearing; 9-second bearing; 10-locking bolt handle; 11-locking seat; 12-cylindrical section; 13-pneumatic spring; 14-articulated seat; 15-output shaft. DETAILED DESCRIPTION

[0035] The principles and features of the present invention are described below. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0036] This utility model refers to Figure 1-4 .

[0037] The utility model provides a tractor steering column, comprising a first main shaft 1, a second main shaft 2, a third main shaft 3, and a mounting bracket 7. The upper part of the second main shaft 2 is connected to the lower part of the first main shaft 1 through a spline, and the lower end of the second main shaft 2 is connected to the third main shaft 3 through a universal joint 6; the upper part of the first main shaft 1 is connected to an outer tube 4 through a first bearing 8, the lower part of the second main shaft 2 is connected to an inner tube 5 through a second bearing 9, the outer tube 4 is slidably connected to the inner tube 5, and the lower end of the inner tube 5 is hinged on the mounting bracket 7 and the hinge shaft is directly opposite to the universal joint 6.

[0038] principle:

[0039] During installation, the mounting bracket 7 is fixed on the driving platform, the upper end of the first main shaft 1 is used to install the steering wheel, and the lower end of the third main shaft 3 is used to connect the intermediate shaft of the steering mechanism, and the steering mechanism is a prior art structure. During operation, the steering wheel drives the first main shaft 1 to rotate, the first main shaft 1 drives the second main shaft 2 to rotate through the spline, and the second main shaft 2 drives the third main shaft 3 to rotate through the universal joint 6. The third main shaft 3 can transmit power to the steering mechanism to realize the transmission of steering power. At the same time, the first bearing 8 and the second bearing 9 bear the radial force of the upper part of the first main shaft 1 and the lower part of the second main shaft 2 respectively, and the outer tube 4 and the inner tube 5 limit each other, so that the first main shaft 1 and the second main shaft 2 will not shake during operation.

[0040] The hinge axis between the inner tube 5 and the mounting bracket 7 is directly opposite to the universal joint 6. The universal joint 6 can adapt to the swing of the second main shaft 2 relative to the third main shaft 3, so that the first main shaft 1, the second main shaft 2, the outer tube 4 and the inner tube 5 can be adjusted in angle around the universal joint 6 as a whole. After the angle is adjusted, the inner tube 5 can be locked by an external locking structure to enter the working state. The first main shaft 1 can slide axially relative to the second main shaft 2 along the spline, and the outer tube 4 can slide axially relative to the inner tube 5, so as to achieve length adjustment. After the length is adjusted, the outer tube 4 and the inner tube 5 can be locked by an external locking structure. Therefore, the driver can adjust the angle and length of the steering column according to his own body shape, height, sitting posture, etc., which is comfortable.

[0041] With the utility model, the first main shaft 1 can be axially adjusted relative to the second main shaft 2 along the spline, and the outer tube 4 can slide with the first main shaft 1; the inner tube 5 can be angle-adjusted with the second main shaft 2 around the universal joint 6; the steering column can be adjusted in length and angle at the same time, with good flexibility and good operating comfort. In addition, the outer tube 4 and the inner tube 5 can protect the cleanliness of the main shaft; the first bearing 8 and the second bearing 9 bear the radial force of the upper part of the first main shaft 1 and the lower part of the second main shaft 2 respectively, and the overall stability of the first main shaft 1 and the second main shaft 2 is good, avoiding the shaking of the steering wheel and the collision of the main shaft with the outer tube 4, improving the control accuracy, and good quietness; at the same time, the radial force is evenly distributed, avoiding the stress concentration between the main shaft and the inner tube 5 or the outer tube 4, reducing wear and extending the service life.

[0042] Furthermore, a locking bolt handle 10 is provided on the outer tube 4 , and the locking bolt handle 10 abuts against the inner tube 5 after passing through the outer tube 4 .

[0043] When the length adjustment is completed, the locking bolt handle 10 is pressed against the inner tube 5 to restrict the outer tube 4 from sliding relative to the inner tube 5, so as to lock the length.

[0044] Furthermore, a locking seat 11 is provided on the outer tube 4, and the locking bolt handle 10 is connected to the locking seat 11 through threads.

[0045] It is convenient to increase the thread length, prevent the locking bolt handle 10 from loosening, and has a good locking effect.

[0046] Furthermore, the outer tube 4 and the inner tube 5 are connected via a spline.

[0047] This facilitates constraining the outer tube 4 and preventing the outer tube 4 from rotating with the first main shaft 1 , thereby stabilizing the direction of the locking bolt handle 10 and avoiding affecting the locking force of the locking bolt handle 10 .

[0048] Furthermore, the lower portion of the first main shaft 1 is a cylindrical section 12 , and the cylindrical section 12 is sleeved on the second main shaft 2 and connected to the second main shaft 2 via a spline.

[0049] The installation is convenient, the spline overlap length of the first main shaft 1 and the second main shaft 2 is ensured, and the transmission reliability is good.

[0050] Furthermore, the lower end of the cylindrical section 12 extends into the inner tube 5 to form a transition fit, and the upper end of the inner tube 5 extends into the outer tube 4 to form a transition fit.

[0051] Through the mutual restraint between the cylindrical section 12, the inner tube 5 and the outer tube 4, the gap between the overlapping parts of the outer tube 4 and the inner tube 5 is reduced, thus avoiding shaking; at the same time, the length adjustment resistance is increased, the locking force requirement is small, the locking is convenient, and the stability is good.

[0052] Furthermore, the first bearing 8 and the second bearing 9 are deep groove ball bearings.

[0053] Furthermore, at least two second bearings 9 are provided.

[0054] The deep groove ball bearing can bear part of the axial force, making it easier for the first main shaft 1 to drive the outer cylinder to move axially; it is also easier to increase the radial force bearing capacity of the inner cylinder, and has good stability.

[0055] Furthermore, it also includes a pneumatic spring 13, one end of the pneumatic spring 13 is hinged to the mounting bracket 7, and the other end of the pneumatic spring 13 is hinged to the inner tube; the pneumatic spring 13 is a self-locking pneumatic spring.

[0056] Note: Self-locking pneumatic spring is a common product name in the prior art.

[0057] When the pneumatic spring 13 is unlocked, the inner cylinder can move relative to the mounting bracket 7; when the angle adjustment is completed, the pneumatic spring 13 is self-locked to constrain the movement of the inner cylinder relative to the mounting bracket 7, thereby achieving angle locking; the angle is easily adjusted and the operation is convenient.

[0058] Furthermore, a hinge seat 14 is provided at the lower end of the inner cylinder, the upper end of the pneumatic spring 13 is hinged on the hinge seat 14 , and the lower end of the pneumatic spring 13 is hinged on the mounting bracket 7 .

[0059] It is convenient to provide installation space for the pneumatic spring 13 and avoid structural interference between the pneumatic spring 13 and the main shafts.

[0060] Furthermore, the lower end of the third main shaft 3 is also connected to an output shaft 15 via a flange.

[0061] The output shaft 15 can be used to connect the steering mechanism; through the flange connection, it is convenient to replace the output shaft 15 separately according to the wear condition, thereby reducing the maintenance cost.

[0062] In the description of the present invention, it should be understood that if there are descriptive terms indicating orientation, direction or positional relationship, such as: "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., the orientation or positional relationship indicated in this specification is based on the orientation or positional relationship shown in the accompanying drawings, which is only for the convenience of understanding the present invention and simplifying the description, and does not indicate or imply that the referred part, element or whole must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0063] In addition, if there are order description terms, such as "first", "second", etc., their purpose in this specification is to facilitate understanding or simplify description. For example, in order to distinguish multiple technical features of the same type or function, but they have to be mentioned separately, this specification may use prefix or suffix order description terms to distinguish them. Therefore, it cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0064] In the present utility model, if the terms describing the relative functional relationship of the structures are used, such as "install", "connect", "connect", "fix", etc., they should be understood in a broad sense unless otherwise clearly specified and limited. For example, "install", "connect", "connect", etc. can be a fixed connection, a detachable connection, or an integrated one; can be a mechanical connection or an electrical connection; can be a direct connection or an indirect connection through an intermediate medium, can be the internal connection of two elements or the interaction relationship between two elements; "fix" can be an integrated fixation or a detachable fixation through fasteners; can be a direct fixation or a fixation through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above-mentioned descriptive terms in the present utility model can be understood according to the specific circumstances, the context, the coherence of the context, etc.

[0065] In the present invention, if there are descriptive terms with subsidiary or connecting meanings, for example, the first feature is "on" or "below" the second feature, unless otherwise clearly specified and limited, it should not be interpreted in a restrictive manner. For example, "on" or "below" can mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above descriptive terms in the present invention can be understood according to the specific circumstances, the context, the coherence of the context, etc.

[0066] Furthermore, the first feature being “above”, “above”, and “above” the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being “below”, “below”, and “below” the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0067] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. In addition, those skilled in the art may combine and combine the different embodiments, examples and features of the different embodiments and examples described in this specification without contradiction, and these combinations or combinations shall all fall within the scope summarized by the utility model.

[0068] Although the embodiments of the present invention have been shown and described above, it is understandable that the above embodiments are illustrative and cannot be construed as limitations on the present invention. Changes, modifications, substitutions and variations of the above embodiments made by ordinary technicians in the field within the scope of information available from public channels and in combination with the technical inspiration given by the application documents are still within the scope of protection of the present application.

Claims

1. A tractor steering column, characterized in that: The invention comprises a first main shaft (1), a second main shaft (2), a third main shaft (3), and a mounting bracket (7); the upper part of the second main shaft (2) is connected to the lower part of the first main shaft (1) via a spline, and the lower end of the second main shaft (2) is connected to the third main shaft (3) via a universal joint (6); the upper part of the first main shaft (1) is connected to an outer tube (4) via a first bearing (8), the lower part of the second main shaft (2) is connected to an inner tube (5) via a second bearing (9), the outer tube (4) is slidably connected to the inner tube (5), and the lower end of the inner tube (5) is hinged on the mounting bracket (7) and the hinge axis faces the universal joint (6).

2. The tractor steering column according to claim 1, characterized in that: The outer tube (4) is also provided with a locking bolt handle (10), which is inserted into the outer tube (4) and abuts against the inner tube (5).

3. The tractor steering column according to claim 2, characterized in that: The outer tube (4) is also provided with a locking seat (11), and the locking bolt handle (10) is connected to the locking seat (11) via threads.

4. The tractor steering column according to claim 3, characterized in that: The outer tube (4) and the inner tube (5) are connected via a spline.

5. The tractor steering column according to claim 1, characterized in that: The lower part of the first main shaft (1) is a cylindrical section (12), and the cylindrical section (12) is sleeved on the second main shaft (2) and connected to the second main shaft (2) via a spline.

6. The tractor steering column according to claim 5, characterized in that: The lower end of the cylindrical section (12) extends into the inner tube (5) and forms a transition fit, and the upper end of the inner tube (5) extends into the outer tube (4) and forms a transition fit.

7. The tractor steering column according to claim 1, characterized in that: The first bearing (8) and the second bearing (9) are deep groove ball bearings; at least two second bearings (9) are provided.

8. The tractor steering column according to claim 1, characterized in that: It also includes a pneumatic spring (13), one end of which is hinged on the mounting bracket (7), and the other end of which is hinged on the inner tube; the pneumatic spring (13) is a self-locking pneumatic spring.

9. The tractor steering column according to claim 8, characterized in that: The lower end of the inner cylinder is also provided with a hinge seat (14), the upper end of the pneumatic spring (13) is hinged on the hinge seat (14), and the lower end of the pneumatic spring (13) is hinged on the mounting bracket (7).

10. The tractor steering column according to claim 1, characterized in that: The lower end of the third main shaft (3) is also connected to an output shaft (15) via a flange.

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