Height-adjustable transmission traction structure

Abstract

The utility model relates to a height -adjustable transmission traction structure in the field of transmission traction of tractor, include: installation base, traction piece is connected with installation base through vertical guide mechanism and can slide along vertical direction, the traction piece rear end is equipped with the traction hook for connecting the traction equipment, wedge block is connected with installation base through horizontal guide mechanism and can slide along horizontal direction, the inclined plane of wedge block and traction piece bottom contact, constitute inclined plane sliding fit pair, the utility model discloses utilize wedge block as the conversion medium of force and movement, the vertical downward working load that traction piece bears is converted as the horizontal force acting on wedge block through inclined plane sliding fit pair, so that the lead screw of driving device only needs to bear horizontal axial force, has greatly reduced the risk of thread wear, deformation and even fracture, improved the reliability, durability and service life of entire transmission system.

Description

Technical Field

[0001] This utility model relates to the field of tractor transmission and traction technology, and in particular to a height-adjustable transmission and traction structure. Background Technology

[0002] Tractors are self-propelled power machines used to tow and drive work machinery to complete various mobile operations. In order to adapt to different agronomic requirements and terrain conditions, it is often necessary to adjust the transmission and traction structure of the tractor.

[0003] Currently, there are several main methods for adjusting the traction height: First, using a hydraulic cylinder to directly lift the traction frame. While this method offers high thrust and fast response, the hydraulic system suffers from high manufacturing costs, susceptibility to leakage, and the need for an additional hydraulic power source, making it uneconomical for small and medium-sized agricultural machinery. Furthermore, maintaining the position for extended periods requires a hydraulic lock, posing a risk of settling. Second, using a vertically mounted screw and nut mechanism to directly drive the traction component's lifting and lowering. This solution is relatively simple in structure, but the screw and nut pair directly bears the entire vertical downward load of the traction implement, as well as the impact loads during operation. This causes the screw threads to be under unfavorable bending and shear stress for extended periods, making them prone to wear, deformation, and even breakage. This results in low reliability and a short service life, especially under heavy loads and impact conditions.

[0004] To address this, we designed a height-adjustable transmission and traction structure. Utility Model Content

[0005] In order to overcome the shortcomings of the prior art, this utility model discloses a highly adjustable transmission traction structure.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A height-adjustable transmission traction structure, comprising:

[0008] Mounting base;

[0009] The traction component is connected to the mounting base via a vertical guide mechanism and can slide in the vertical direction. The rear end of the traction component is provided with a traction hook for connecting to a traction device.

[0010] The wedge block is connected to the mounting base via a horizontal guide mechanism and can slide in the horizontal direction; the inclined surface of the wedge block contacts the bottom of the traction member, forming an inclined sliding fit pair;

[0011] A drive device is installed on the mounting base, and its output end is connected to the wedge block for driving the wedge block to move horizontally, thereby driving the traction member to move vertically through the inclined sliding joint to achieve height adjustment.

[0012] Furthermore, there are two traction components, symmetrically arranged on the left and right sides of the mounting base.

[0013] Furthermore, the driving device includes a drive motor, a reducer, and two lead screws; the reducer has two output shafts, which are respectively connected to one end of the two lead screws; each lead screw is threadedly engaged with one of the wedge blocks to synchronously drive the two wedge blocks to move towards or away from each other.

[0014] Furthermore, the bottom of the front sidewall of the wedge block is provided with a forward-protruding connecting part, and the connecting part is provided with a threaded hole that mates with the lead screw.

[0015] Furthermore, the rear bottom of the mounting base is provided with a rearwardly extending support extension, and the wedge block is connected to the top surface of the support extension through a horizontal guide mechanism.

[0016] Furthermore, the traction component includes:

[0017] The main body is connected to the vertical guide mechanism;

[0018] The ball joint assembly includes a ball pocket on the main body and a ball head rod with a ball head at the front end. The ball head is omnidirectionally engaged with the ball pocket, and the ball head rod has a traction hook at its rear end.

[0019] Furthermore, the ball joint assembly also includes a removable pressure cap that encapsulates the ball head within the ball pocket.

[0020] Furthermore, the traction component also includes a flexible dust cover, one end of which is sealed and fitted onto the ball joint rod, and the other end is sealed and connected to the main body or the pressure cap.

[0021] Furthermore, it also includes a clutch, which is disposed on the top of the mounting base, with its input and output ends used for connecting a power source and a traction device, respectively.

[0022] Compared with the prior art, the beneficial effects of this utility model are:

[0023] 1. By using a wedge block as a medium for converting force and motion, the vertically downward working load borne by the traction component is converted into a horizontal force acting on the wedge block through the inclined sliding fit pair. This allows the lead screw of the drive device to bear only the horizontal axial force, rather than directly bearing the huge vertical shear force and bending moment, thereby greatly reducing the risk of thread wear, deformation and even breakage, and improving the reliability, durability and service life of the entire transmission system.

[0024] 2. The drive unit is arranged horizontally and is equipped with a wedge mechanism. Under the same output lifting force, the requirements for the torque and power of the drive motor are lower. Therefore, a smaller and lower cost drive motor and reducer can be selected. At the same time, the horizontal layout allows the entire drive component to be housed in the mounting base, avoiding space occupation in the vertical direction, making the overall structure more compact and reasonable.

[0025] 3. Two sets of wedge-shaped transmission mechanisms are symmetrically arranged and synchronously driven by the same drive device, forming a stable double-sided support system. This system can balance the force and evenly distribute the load, effectively avoiding problems such as jamming, increased wear, or structural deformation that may be caused by unilateral lifting. This greatly enhances the stability and load-bearing capacity under off-center load conditions. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the structure of this utility model;

[0027] Figure 2 This is the right view of the present invention;

[0028] Figure 3 This is a rear view of the present invention;

[0029] Figure 4 for Figure 3 AA section view;

[0030] Figure 5 for Figure 4 BB cross-sectional view.

[0031] In the diagram: 1. Mounting base; 11. Support extension; 2. Clutch; 3. Traction component; 31. Main body; 32. Removable cover; 33. Ball joint rod; 34. Flexible dust cover; 4. Traction hook; 5. Wedge block; 51. Connecting part; 6. Drive device; 61. Drive motor; 62. Reducer; 63. Lead screw. Detailed Implementation

[0032] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0033] In the description of this utility model, it should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0034] Example 1, please refer to Figures 1 to 5 This embodiment provides a height-adjustable transmission traction structure, which achieves stepless and stable adjustment of the traction point height through a wedge mechanism that converts horizontal movement into vertical movement. It mainly includes a mounting base 1, a traction component 3, a wedge block 5, and a drive device 6.

[0035] Mounting base 1 serves as the basic support for the entire structure. It is usually formed by welding steel plates, and its bottom can be fixed to the tractor by bolts or other means.

[0036] The traction component 3 is connected to the rear side wall of the mounting base 1 via a vertical guide mechanism (not shown in the figure).

[0037] In this embodiment, the vertical guide mechanism is a vertical slide rail slider structure set on the rear side wall of the mounting base 1. The traction member 3 can slide smoothly up and down along this track, restricting its movement in other directions and ensuring the stability and accuracy of the lifting process. The rear end of the traction member 3 is provided with a traction hook 4 for connecting agricultural implements such as plows and harrows or other traction equipment.

[0038] Preferably, the rear bottom of the mounting base 1 is provided with a rearward horizontally extending support extension 11 to provide additional support and mounting platform.

[0039] The wedge block 5 is connected to the mounting base 1 via a horizontal guide mechanism (not shown in the figure). Specifically, this horizontal guide mechanism can be a horizontal groove slider structure provided on the top surface of the support extension 11. The wedge block 5 can slide horizontally left and right along this groove.

[0040] Specifically, the upper surface of the wedge block 5 is an inclined surface, which contacts the inclined surface of the bottom side of the corresponding traction member 3, together forming an inclined sliding fit pair. When the wedge block 5 moves horizontally, its inclined surface exerts a pushing or lowering force on the bottom of the traction member 3, thereby accurately converting the horizontal movement of the wedge block 5 into the vertical movement of the traction member 3.

[0041] The drive unit 6 is mounted on the mounting base 1 and is used to provide power to drive the wedge block 5 to move.

[0042] In a preferred embodiment, the drive device 6 includes a drive motor 61, a reducer 62, and a lead screw 63. The output shaft of the drive motor 61 is connected to the input end of the reducer 62. After reduction and torque amplification, the output shaft of the reducer 62 drives the lead screw 63 to rotate. A forward-protruding connecting portion 51 is provided at the bottom of the front sidewall of the wedge block 5. An internal threaded hole is provided on this connecting portion 51, through which the lead screw 63 passes and is clearance-fitted. When the lead screw 63 rotates, it drives the wedge block 5 to move linearly in the horizontal direction via threaded transmission.

[0043] To enhance structural stability and load-bearing capacity, two wedge blocks 5 are symmetrically arranged, located on the left and right sides of the mounting base 1, respectively. Correspondingly, the reducer 62 of the drive device 6 has two output shafts, each connected to a lead screw 63. Whether the threads of the two lead screws 63 are aligned corresponds to whether the rotation directions of the two output shafts of the reducer 62 are aligned; no specific limitation is made here. When the drive motor 61 starts, it synchronously drives the two lead screws 63 to rotate in the same direction via the reducer 62, thereby enabling the two wedge blocks 5 to move synchronously towards or away from each other. This ensures that the traction component 3 experiences consistent force on both sides and rises and falls, preventing uneven force distribution on the traction equipment.

[0044] Example 2: Based on Example 1, this example further optimizes the connection method between the traction component 3 and the traction hook 4 to allow the traction equipment to have a certain degree of swing freedom during movement, adapting to uneven ground.

[0045] Please refer to 4. The traction member 3 includes a main body 31 connected to the vertical slide rail slider structure. The traction hook 4 is connected to the main body 31 via a ball joint assembly. The ball joint assembly includes a ball pocket formed in the middle of the rear side of the main body 31, a ball head rod 33 with a ball head at the front end, and a removable pressure cap 32 that encapsulates the ball head in the ball pocket.

[0046] Specifically, the ball joint can be formed by combining a first hemispherical pocket on the main body 31 and a second hemispherical pocket on the removable pressure cap 32. The ball head of the ball joint 33 is housed in this ball joint and can rotate in all directions. The rod of the ball joint 33 extends rearward, and a traction hook 4 is installed at its end. The removable pressure cap 32 is fixed to the main body 31 by bolts or other fasteners, facilitating the assembly, disassembly, and maintenance of the ball joint.

[0047] Depending on the needs, the removable pressure cap 32 can be located at the rear of the main body 31 or at the front of the main body 31. That is, the shaft of the ball joint 33 can extend rearward through the removable pressure cap 32, and the shaft of the ball joint 33 can extend rearward through the main body 31.

[0048] In addition, to protect the ball joint assembly from dust, mud, and other contaminants and extend its service life, the traction component 3 also includes a flexible dust cover 34. This flexible dust cover 34 can be made of materials such as rubber or corrugated plastic. One end of it is sealed to the body of the ball joint 33 via a clamp or interference fit, and the other end is similarly fixed to the removable pressure cap 32 or the rear side of the main body 31 via a sealed connection.

[0049] In embodiment three, based on any of the above embodiments and referring to 1-2, the transmission traction structure of this embodiment may further include a clutch 2. The clutch 2 is disposed on the top of the mounting base 1, with its input end connected to the tractor's power output shaft and its output end connected to the input shaft of the traction device. The clutch 2 can be used to transmit or disconnect power, enabling this invention to not only have height adjustment capabilities but also to achieve power transmission and control, resulting in a higher degree of integration.

[0050] The working principle of this utility model is as follows:

[0051] When the traction height needs to be adjusted, the drive unit 6 is activated. The drive motor 61 drives the two lead screws 63 to rotate synchronously through the reducer 62. Since the lead screws 63 are threadedly engaged with the connecting part 51 on the wedge block 5, and the wedge block 5 is restricted to horizontal movement by the horizontal guide mechanism, the rotational motion of the lead screws 63 is converted into the horizontal linear motion of the wedge block 5. When the wedge block 5 moves horizontally, its inclined surface interacts with the bottom of the traction member 3, pushing the traction member 3 up or down along the vertical guide mechanism, thereby driving the traction hook 4 at its end and the connected equipment to the predetermined height. The entire adjustment process is smooth, reliable, and can self-lock in any position.

[0052] The parts of this utility model not described in detail are prior art. It is obvious to those skilled in the art that this utility model is not limited to the details of the above exemplary embodiments, and that this utility model can be implemented in other specific forms without departing from the spirit or basic characteristics of this utility model. Therefore, the above embodiments should be regarded as exemplary and non-limiting in all respects. The scope of this utility model is defined by the appended claims rather than the foregoing description. Therefore, it is intended to include all changes that fall within the meaning and scope of the equivalents of the claims within this utility model.

Claims

1. A height-adjustable transmission and traction structure, characterized in that, include: Mounting base (1); The traction component (3) is connected to the mounting base (1) through a vertical guide mechanism and can slide in the vertical direction. The rear end of the traction component (3) is provided with a traction hook (4) for connecting to the traction device. The wedge block (5) is connected to the mounting base (1) through a horizontal guide mechanism and can slide in the horizontal direction; the inclined surface of the wedge block (5) contacts the bottom of the traction member (3) to form an inclined sliding fit pair; The drive device (6) is installed on the mounting base (1), and its output end is connected to the wedge block (5) for driving the wedge block (5) to move horizontally, and then drive the traction member (3) to move vertically through the inclined sliding pair to achieve height adjustment.

2. The height-adjustable transmission and traction structure according to claim 1, characterized in that: The number of the traction components (3) is two, which are symmetrically arranged on the left and right sides of the mounting base (1).

3. The height-adjustable transmission and traction structure according to claim 2, characterized in that: The drive device (6) includes a drive motor (61), a reducer (62) and two lead screws (63); the reducer (62) has two output shafts, which are respectively connected to one end of the two lead screws (63); each lead screw (63) is threadedly engaged with a wedge block (5) so as to synchronously drive the two wedge blocks (5) to move towards or away from each other.

4. The height-adjustable transmission and traction structure according to claim 3, characterized in that: The wedge block (5) has a forward-protruding connecting part (51) at the bottom of its front side wall, and the connecting part (51) has a threaded hole that mates with the lead screw (63).

5. The height-adjustable transmission and traction structure according to claim 1, characterized in that: The mounting base (1) has a rearwardly extending support extension (11) at its rear bottom, and the wedge block (5) is connected to the top surface of the support extension (11) through a horizontal guide mechanism.

6. The height-adjustable transmission and traction structure according to claim 1, characterized in that: The traction component (3) includes: The main body (31) is connected to the vertical guide mechanism; The ball joint assembly includes a ball pocket on the main body (31) and a ball head rod (33) with a ball head at the front end. The ball head is omnidirectionally engaged with the ball pocket, and the ball head rod (33) has the traction hook (4) at its rear end.

7. The height-adjustable transmission and traction structure according to claim 6, characterized in that: The ball joint assembly also includes a removable pressure cap (32) that encapsulates the ball head within the ball pocket.

8. The height-adjustable transmission and traction structure according to claim 7, characterized in that: The traction component (3) also includes a flexible dust cover (34), one end of which is sealed on the ball head rod (33), and the other end is sealed to the main body (31) or the pressure cap (32).

9. The height-adjustable transmission and traction structure according to claim 1, characterized in that: It also includes a clutch (2), which is located on the top of the mounting base (1), with its input end and output end used to connect the power source and the traction device, respectively.

Images