A crawler tractor walking and steering linkage control mechanism

Abstract

This invention relates to the field of tractor control mechanism technology, and particularly to a tracked tractor travel and steering linkage control mechanism, comprising a pivot arm, a steering gear, a steering cam, and a sleeve. The pivot arm is connected at both ends to a left steering arm and a right steering arm via a tie rod assembly and a rocker arm assembly, respectively. The pivot arm is mounted on the steering gear, which is slidably mounted on a slide rail. The chassis base of the steering gear is connected to a control lever via a fifth tie rod. The steering cam is connected to the steering arm and can drive the steering arm to rotate. The sleeve is connected to a steering wheel, and a sliding shaft is slidably mounted inside the sleeve. This invention can directly control the forward, backward, and steering movement of a tracked tractor. Operation is simple and convenient. By linking the left and right steering arms with a dual-pump linkage, the travel speed of the tracked tractor is infinitely adjustable, and differential steering with zero turning is possible.

Description

Technical Field

[0001] The invention relates to the technical field of tractor control mechanisms, in particular to a walking and steering linkage control mechanism for a crawler tractor. Background Art

[0002] For crawler tractors, moving forward, backward and turning are controlled by different operating mechanisms, which makes the operating mechanisms relatively complicated in structure and more complex to operate. Summary of the invention

[0003] The present invention solves the problems in the related art and proposes a crawler tractor walking and steering linkage control mechanism, which can directly control the forward, backward and steering of the crawler tractor. The operation is simple and convenient. The walking speed of the crawler tractor can be adjusted steplessly by controlling the left steering arm and the right steering arm of the linkage double pump, and the tractor can realize on-site differential steering and zero turn.

[0004] In order to solve the above technical problems, the present invention is implemented through the following technical solutions: a crawler tractor walking and steering linkage control mechanism, comprising:

[0005] A rotating shaft arm, both ends of which are connected to a left steering arm and a right steering arm through a pull rod assembly and a rocker arm assembly respectively;

[0006] A steering machine, the rotating shaft arm is installed on the steering machine, the steering machine is slidably installed on the slide rail, and the chassis seat of the steering machine is connected to the operating lever through a fifth pull rod;

[0007] A steering cam, wherein the steering cam is connected to the direction rotating arm and can drive the direction rotating arm to rotate;

[0008] A sleeve is connected to the steering wheel and a sliding shaft is slidably installed in the sleeve.

[0009] As a preferred embodiment, the tie rod assembly includes a first tie rod, a second tie rod, a third tie rod and a fourth tie rod, and the rocker arm assembly includes a first front rocker arm and a second front rocker arm; the two ends of the rotating shaft arm are respectively connected to the first tie rod and the second tie rod, the first tie rod and the second tie rod are respectively connected to one end of the first front rocker arm and the second front rocker arm, the other ends of the first front rocker arm and the second front rocker arm are respectively connected to one end of the third tie rod and the fourth tie rod, and the other ends of the third tie rod and the fourth tie rod are respectively connected to the left steering arm and the right steering arm.

[0010] As a preferred solution, limit protrusions are provided on both the left and right sides of the steering cam to limit the left and right rotation angles of the steering wheel.

[0011] As a preferred solution, a bearing is installed on the direction rotating arm, and the steering cam drives the direction rotating arm to rotate through the bearing.

[0012] As a preferred solution, a return spring is installed on the direction rotating arm.

[0013] As a preferred solution, the inner hole of the sleeve is a hexagonal hole, and the sliding shaft is a hexagonal shaft matching the inner hole of the sleeve.

[0014] Compared with the prior art, the invention has the following beneficial effects: the invention can realize the forward, backward and steering of the crawler tractor through a set of operating mechanisms, and the operation is simple and convenient; the crawler tractor's walking speed can be adjusted steplessly by controlling the left steering arm and the right steering arm of the linked double pump, and the tractor can be turned differentially on the spot and zero turn can be realized; the right steering arm and the left steering arm of the linked double pump are swung forward or backward in unison by the operating lever, the pull rod, etc., and the turning angle is the same, so that the flow rate entering the left and right travel motors is the same in size and direction, the steering arm swing angle changes within a certain range, and the corresponding flow rate entering the left and right motors changes within a certain range, thereby realizing the stepless adjustment of the forward and backward speed of the tractor; a return spring is installed on the direction arm, and when both hands are released after turning the steering wheel, the return spring can drive the direction arm to return automatically, so that the steering wheel automatically returns, the operation is more labor-saving, and it conforms to ergonomics. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the structure of the present invention;

[0016] Figure 2 The present invention Figure 1 M-direction view in .

[0017] In the figure:

[0018] 1. Pivot arm, 2. First tie rod, 3. Second tie rod, 4. First front rocker arm, 5. Second front rocker arm, 6. Third tie rod, 7. Fourth tie rod, 8. Control left steering arm, 9. Control right steering arm, 10. Steering gear, 11. Slide rail, 12. Fifth tie rod, 13. Joystick, 14. Steering cam, 15. Steering arm, 1501, bearing, 16. Sleeve, 17. Steering wheel, 18. Sliding shaft, 19. Return spring. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0021] Unless otherwise specifically stated, the relative arrangement of the parts and steps described in these embodiments, numerical expressions and numerical values ​​do not limit the scope of the present invention. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, method and equipment known to ordinary technicians in the relevant field may not be discussed in detail, but in appropriate cases, the technology, method and equipment should be regarded as a part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0022] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the devices or elements referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention. The directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0023] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0024] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0025] like Figures 1 to 2 As shown, a crawler tractor walking steering linkage control mechanism comprises a rotating shaft arm 1, a steering machine 10, a steering cam 14 and a sleeve 16. The two ends of the rotating shaft arm 1 are respectively connected to the left steering arm 8 and the right steering arm 9 through a tie rod assembly and a rocker arm assembly; the rotating shaft arm 1 is installed on the steering machine 10, and the steering machine 10 is slidably installed on the slide rail 11. The chassis seat of the steering machine 10 is connected to the operating rod 13 through the fifth tie rod 12. When the operating rod 13 is moved forward and backward, the operating rod 13 drives the steering machine 10 through the fifth tie rod 12. The steering mechanism 10 slides forward and backward on the slide rail 11, so the tractor is in a straight-line driving state at this time; the steering cam 14 is connected to the steering arm 15 and can drive the steering arm 15 to rotate; the sleeve 16 is connected to the steering wheel 17 and a sliding shaft 18 is slidably installed in the sleeve 16, and the sliding shaft 18 can slide axially along the sleeve 16 to ensure that when the steering mechanism 10 is in any position of the slide rail 11, the sleeve 16 that rotates the steering wheel 17 can transmit the rotation to the sliding shaft 18, so that the tractor can turn when moving forward or backward.

[0026] In one embodiment, the tie rod assembly includes a first tie rod 2, a second tie rod 3, a third tie rod 6 and a fourth tie rod 7, and the rocker arm assembly includes a first front rocker arm 4 and a second front rocker arm 5; the two ends of the rotating shaft arm 1 are respectively connected to the first tie rod 2 and the second tie rod 3, the first tie rod 2 and the second tie rod 3 are respectively connected to one end of the first front rocker arm 4 and the second front rocker arm 5, the other ends of the first front rocker arm 4 and the second front rocker arm 5 are respectively connected to one end of the third tie rod 6 and the fourth tie rod 7, and the other ends of the third tie rod 6 and the fourth tie rod 7 are respectively connected to the left steering arm 8 and the right steering arm 9.

[0027] In one embodiment, limit protrusions are provided on both the left and right sides of the steering cam 14 to limit the left and right rotation angles of the steering wheel 17 .

[0028] In one embodiment, a bearing 1501 is installed on the direction rotating arm 15 , and the steering cam 14 drives the direction rotating arm 15 to rotate via the bearing 1501 .

[0029] In one embodiment, a return spring 19 is installed on the steering arm 15. When both hands are released after turning the steering wheel 17, the return spring 19 can drive the steering arm 15 to return automatically, thereby making the steering wheel 17 return automatically, making operation more labor-saving and ergonomic.

[0030] In one embodiment, the inner hole of the sleeve 16 is a hexagonal hole, and the sliding shaft 18 is also a hexagonal shaft matching the inner hole of the sleeve 16 .

[0031] Working principle:

[0032] When the tractor is traveling in a straight line: the steering machine 10 is connected to the first front rocker arm 4 and the second front rocker arm 5 through the first tie rod 2 and the second tie rod 3 on the pivot arm 1, and the first front rocker arm 4 and the second front rocker arm 5 are respectively connected to the left steering arm 8 and the right steering arm 9 of the double pump through the third tie rod 6 and the fourth tie rod 7, and the base plate of the steering machine 10 is connected to the joystick 13 through the fifth tie rod 12. When the joystick 13 is moved forward and backward, the joystick 13 drives the steering machine 10 to slide forward and backward on the slide rail 11 through the fifth tie rod 12. At this time, the tractor is in a straight line driving state, so the user does not rotate the steering wheel 17 by holding the steering wheel 17, so the pivot arm 1 does not rotate, and the first front rocker arm 4 and the second front rocker arm 5 do not rotate and are connected to the steering machine 1 0 relative position remains unchanged, when the steering machine 10 slides along the slide rail 11, the first front rocker arm 4 and the second front rocker arm 5 drive the left steering arm 8 and the right steering arm 9 to swing forward or backward in unison, so that the double pump controls the flow rate entering the left and right travel motors to be the same in size and direction. When the steering machine 10 is in the slide rail 11 position change, the left steering arm 8 and the right steering arm 9 swing forward or backward in unison with the same turning angle, so that the flow rate entering the left and right travel motors is the same in size and direction. The swing angles of the left steering arm 8 and the right steering arm 9 change within a certain range, and the corresponding flow rate entering the left and right motors changes within a certain range, thereby realizing stepless adjustment of the forward and backward speed of the tractor.

[0033] When the tractor turns: when the steering wheel 17 is turned, the sleeve 16 rotates a certain angle, driving the sliding shaft 18 to rotate and causing the steering cam 14 to rotate a corresponding angle. After the steering cam 14 rotates, the pivot arm 1 rotates through the steering gear 10, and the pivot arm 1 rotates the first front rocker arm 4 and the second front rocker arm 5 in opposite directions through the first pull rod 2 and the second pull rod 3. The first front rocker arm 4 and the second front rocker arm 5 then respectively cause the left steering arm 8 and the right steering arm 9 on the double pump to swing in opposite directions through the third pull rod 6 and the fourth pull rod 7, so that the flow rates entering the left and right motors are inconsistent, and there is a speed difference between the left and right motors. The tractor can turn forward, backward or in situ; when the hand releases the steering wheel 17, the return spring 19 returns the steering cam 14 to the neutral position through the direction rotating arm 15, and the steering wheel 17 returns to the neutral position.

[0034] The above are preferred implementation modes of the present invention. Those skilled in the art to which the present invention belongs can also change and modify the above implementation modes. Therefore, the present invention is not limited to the above specific implementation modes. Any obvious improvements, substitutions or modifications made by those skilled in the art on the basis of the present invention belong to the protection scope of the present invention.

Claims

1. A crawler tractor walking and steering linkage control mechanism, characterized in that: include: A pivot arm (1), wherein two ends of the pivot arm (1) are respectively connected to a first pull rod (2) and a second pull rod (3), wherein the first pull rod (2) and the second pull rod (3) are respectively connected to one end of a first front rocker arm (4) and a second front rocker arm (5), wherein the other ends of the first front rocker arm (4) and the second front rocker arm (5) are respectively connected to one end of a third pull rod (6) and a fourth pull rod (7), wherein the other ends of the third pull rod (6) and the fourth pull rod (7) are respectively connected to a left steering arm (8) and a right steering arm (9); A steering machine (10), wherein the rotating shaft arm (1) is mounted on the steering machine (10), the steering machine (10) is slidably mounted on a slide rail (11), and the chassis seat of the steering machine (10) is connected to a joystick (13) via a fifth pull rod (12); A steering cam (14), the steering cam (14) is connected to a direction rotating arm (15) and can drive the direction rotating arm (15) to rotate, and both left and right sides of the steering cam (14) are provided with limiting protrusions to limit the left and right rotation angles of the steering wheel (17); A sleeve (16) is connected to a steering wheel (17) and a sliding shaft (18) is slidably installed in the sleeve (16).

2. The crawler tractor travel and steering linkage control mechanism according to claim 1, characterized in that: A bearing (1501) is installed on the direction rotating arm (15), and the steering cam (14) drives the direction rotating arm (15) to rotate via the bearing (1501).

3. The crawler tractor travel and steering linkage control mechanism according to claim 1, characterized in that: A return spring (19) is installed on the direction rotating arm (15).

4. The crawler tractor travel and steering linkage control mechanism according to claim 1, characterized in that: The inner hole of the sleeve (16) is a hexagonal hole, and the sliding shaft (18) is a hexagonal shaft matching the inner hole of the sleeve (16).

Images