Mechanical HST control arm return mechanism and tractor with same
By designing a mechanical HST control arm return mechanism including a fixed carrier, a control plate and an elastic extrusion return assembly, the problem of the mechanical HST control arm being misaligned after a long period of use is solved, and the control arm is automatically returned to the median, improving the accuracy and safety of vehicle travel.
Patent Information
- Application Number
- CN202421401692.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-19
- Publication Date
- 2025-05-13
- Estimated Expiration
- 2034-06-19
AI Technical Summary
After long-term use of existing mechanical HST control arms, they are prone to the problem of median misalignment, resulting in inaccurate vehicle travel speed and even safety hazards.
A mechanical HST operating arm repositioning mechanism is designed, including a fixed carrier, a control plate and an elastic extrusion repositioning assembly. By flexibly extruding the continuous elastic squeeze pressure of the reposition assembly, the joystick automatically returns to the middle position after the driver releases the pedal.
It effectively avoids the median misalignment caused by long-term use, ensures that the HST control arm is always in the median state, and improves the accuracy and safety of vehicle travel.
Smart Images
Figure CN222852628U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of agricultural machinery and equipment, in particular to a mechanical HST operating arm return mechanism and a tractor with the same. Background Art
[0002] Among the existing HST tractors, the control methods of HST are divided into electronic control and mechanical control. The vast majority of models are electronically controlled, relying on the processing of electrical signals to realize the forward and backward movement of the tractor. However, in order to save costs, some small tractors use mechanically controlled HST. After long-term use of this control method, there is a certain angle error between the flow control control shaft of the HST and the factory setting of 0. Due to the different rotation directions of the shaft and the different vehicle travel directions, the error will cause inaccurate vehicle travel speed. In severe cases, it will cause the vehicle to travel in a different way from the actual one, posing a huge safety hazard.
[0003] Based on this, it is necessary to develop a mechanical HST manipulator arm return mechanism that can automatically return to the center position after the HST manipulator arm (joystick automatically) rotates an angle, thereby overcoming the above technical problems. Utility Model Content
[0004] The technical problem to be solved by the utility model is to provide a mechanical HST operating arm return mechanism and a tractor with the same, which effectively overcomes the defects of the prior art.
[0005] The technical solution of the utility model to solve the above technical problems is as follows:
[0006] A mechanical HST operating arm return mechanism comprises a fixed carrier, an operating plate and an elastic extrusion return component. The elastic extrusion return component is installed on the fixed carrier, one end of which is an extrusion end. One end of the operating plate is connected to an HST flow operating shaft through an operating arm vertically connected thereto. The other end of the operating plate is provided with a V-shaped limit bayonet. The upper part of the other end of the operating plate is connected to a foot pedal. The extrusion end of the elastic extrusion return component is embedded in the limit bayonet and is embedded in the V-shaped tip of the limit bayonet when the foot pedal is not stepped on.
[0007] On the basis of the above technical solution, the present invention can also be improved as follows.
[0008] Furthermore, the elastic extrusion return assembly includes a guide sleeve, a return ball and an elastic extrusion member. The guide sleeve is mounted on the fixed carrier, and one end of the guide sleeve is close to the other end of the operating plate. The other end of the guide sleeve is open, and both sides of the other end are provided with strip-shaped guide grooves extending through the end along its axial direction. The other end of the operating plate is inserted through the guide grooves on both sides. The return ball is arranged in the guide sleeve. The elastic extrusion member is arranged inside the guide sleeve and connected between the return ball and the other end of the guide sleeve. The return ball constitutes the extrusion end of the elastic extrusion return assembly.
[0009] Furthermore, the elastic extrusion member includes a spring and a limit plate, two ends of the spring are respectively connected to the limit plate and the other end of the guide sleeve, and the limit plate is in contact with the return ball.
[0010] Furthermore, the elastic extrusion return assembly also includes an elastic force adjustment assembly, which is installed at the other end of the guide sleeve. The two ends of the spring are respectively connected to the limit plate and the elastic force adjustment assembly. The elastic force adjustment assembly is used to adjust the compression elastic force of the spring along the long axis direction of the guide sleeve.
[0011] Furthermore, the elastic force adjustment component includes a blocking block, an adjusting bolt and an adjusting block. The blocking block is fixed in the opening at the other end of the guide sleeve. A screw hole is provided in the blocking block along the long axis of the guide sleeve. The screw of the adjusting bolt passes through the screw hole and extends into the other end of the guide sleeve. The adjusting bolt is screwed into the screw hole. The adjusting block is installed on the screw end of the adjusting bolt. The two ends of the spring are respectively connected to the limit plate and the adjusting block.
[0012] Furthermore, the elastic force adjustment component further comprises a locking nut, which is screwed onto the portion of the adjusting bolt exposed from the guide sleeve.
[0013] Furthermore, the fixed carrier includes a fixed plate and a mounting plate, the mounting plate is vertically connected to one end of the fixed plate, and one end of the guide sleeve vertically penetrates the mounting plate and is connected and fixed to each other.
[0014] Furthermore, a rib plate perpendicular to the two is provided on one side of the connection between one end of the fixing plate and the mounting plate, and one end of the guide sleeve is fitted and fixed on the rib plate.
[0015] Furthermore, an extension portion connected to the foot pedal is provided at the upper portion of the other end of the control panel, and an assembly hole is provided through the extension portion.
[0016] The beneficial effects of the utility model are: the structural design is simple and reasonable, and the continuous elastic extrusion force of the elastic extrusion return component is used to realize that the joystick automatically returns to the middle position after the driver releases the pedal, thereby avoiding the situation of middle position misalignment caused by long-term use and ensuring that the HST joystick arm is always in the middle position.
[0017] Also provided is a tractor including a mechanical HST manipulator arm return mechanism. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] Figure 1 It is a structural stereogram of the mechanical HST manipulator arm return mechanism of the utility model;
[0019] Figure 2 It is a structural side view of the mechanical HST manipulator arm return mechanism of the utility model;
[0020] Figure 3 It is a top view of the structure of the mechanical HST manipulator arm return mechanism of the utility model;
[0021] Figure 4 for Figure 3 Structural cross-section view of the AA surface in the middle.
[0022] In the accompanying drawings, the components represented by the reference numerals are listed as follows:
[0023] 1. Fixed carrier; 2. Control plate; 3. Elastic extrusion return assembly; 4. HST flow control shaft; 11. Fixed plate; 12. Mounting plate; 13. Rib plate; 21. Control arm; 22. Limiting bayonet; 23. Extension; 31. Guide sleeve; 32. Return ball; 33. Elastic extrusion piece; 34. Elastic force adjustment assembly; 311. Guide slot; 331. Spring; 332. Limiting plate; 341. Blocking block; 342. Adjusting bolt; 343. Adjusting block; 344. Locking nut. DETAILED DESCRIPTION
[0024] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.
[0025] Example: Figure 1 , 2As shown in Figures 3 and 4, the mechanical HST operating arm return mechanism of this embodiment includes a fixed carrier 1, an operating plate 2 and an elastic extrusion return component 3. The elastic extrusion return component 3 is installed on the fixed carrier 1, and one end of the elastic extrusion return component 3 is an extrusion end. One end of the operating plate 2 is connected to the HST flow operating shaft 4 through an operating arm 21 vertically connected thereto. The other end of the operating plate 2 is provided with a V-shaped limit bayonet 22. The upper part of the other end of the operating plate 2 is connected to the foot pedal. The extrusion end of the elastic extrusion return component 3 is embedded in the limit bayonet 22, and is embedded in the V-shaped tip of the limit bayonet 22 when the foot pedal is not stepped on.
[0026] The elastic extrusion return assembly 3 includes a guide sleeve 31, a return ball 32 and an elastic extrusion member 33. The guide sleeve 31 is mounted on the fixed carrier 1, and one end of the guide sleeve 31 is close to the other end of the operating plate 2. The other end of the guide sleeve 31 is open, and both sides of the other end are provided with strip-shaped guide grooves 311 extending from the end along its axial direction. The other end of the operating plate 2 is inserted through the guide grooves 311 on both sides. The return ball 32 is arranged in the guide sleeve 31. The elastic extrusion member 33 is arranged inside the guide sleeve 31 and connected between the return ball 32 and the other end of the guide sleeve 31. The return ball 32 constitutes the extrusion end of the elastic extrusion return assembly 3.
[0027] It should be particularly noted that the size (diameter) of the return ball 32 in this embodiment is close to the inner diameter of the guide sleeve 31, and the gap between the two is very small, ensuring that the return ball 32 will hardly jump when moving along the long axis direction, and ensuring that the return ball 32 can be directly embedded in the V-shaped tip (that is, the center) of the limit bayonet 22 under the extrusion of the elastic extrusion piece 33 after the foot pedal is released, so that the operating arm 21 and the HST flow control shaft 4 rotate back to the middle position (in this embodiment, when the return ball 32 is embedded in the center of the limit bayonet 22, the HST flow control shaft 4 is in the middle position).
[0028] In this embodiment, the V-shaped tip of the limit stopper 22 is designed to be an arc shape that matches the outer shape of the return ball 32, so that the return ball 32 can be effectively embedded in the V-shaped tip of the limit stopper 22 and maintain a close fit between the two (in this state, the maximum diameter line of the return ball 32, that is, the equator line, is in contact with and squeezed with the V-shaped tip of the limit stopper 22).
[0029] The elastic extrusion member 33 includes a spring 331 and a limiting plate 332 . Two ends of the spring 331 are respectively connected to the limiting plate 332 and the other end of the guide sleeve 31 . The limiting plate 332 is in contact with the return ball 32 .
[0030] The elastic extrusion return component 3 also includes an elastic force adjustment component 34, which is installed at the other end of the guide sleeve 31. The two ends of the spring 331 are respectively connected to the limit plate 332 and the elastic force adjustment component 34. The elastic force adjustment component 34 is used to adjust the compression elastic force of the spring 331 along the long axis direction of the guide sleeve 31.
[0031] The elastic force adjustment component 34 includes a blocking block 341, an adjusting bolt 342 and an adjusting block 343. The blocking block 341 is fixed in the open end of the guide sleeve 31. A screw hole is provided in the blocking block 341 along the long axis of the guide sleeve 31. The screw of the adjusting bolt 342 passes through the screw hole and extends into the other end of the guide sleeve 31. The adjusting bolt 342 is screwed into the screw hole. The adjusting block 343 is installed on the screw end of the adjusting bolt 342. The two ends of the spring 331 are respectively connected to the limit plate 332 and the adjusting block 343.
[0032] The elastic force adjustment assembly 34 further includes a locking nut 344 , which is screwed onto a portion of the adjustment bolt 342 exposed from the guide sleeve 31 .
[0033] The fixed carrier 1 comprises a fixing plate 11 and a mounting plate 12 . The mounting plate 12 is vertically connected to one end of the fixing plate 11 . One end of the guide sleeve 31 vertically penetrates the mounting plate 12 , and the guide sleeves 31 are connected and fixed to each other.
[0034] A rib plate 13 perpendicular to the two is provided at one side of the connection between one end of the fixing plate 11 and the mounting plate 12 , and one end of the guide sleeve 31 is fitted and fixed on the rib plate 13 .
[0035] An extension portion 23 connected to the foot pedal is disposed at the upper portion of the other end of the control panel 2 , and an assembly hole is penetrated through the extension portion 23 .
[0036] Example 2
[0037] The tractor of this embodiment includes the mechanical HST manipulator arm return mechanism of embodiment 1.
[0038] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.
[0039] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. 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 "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.
[0040] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like 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 a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0041] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a 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. A first feature being "below", "below" or "below" a 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.
[0042] 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 representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.
[0043] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations of the present invention. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the present invention.
Claims
1. A mechanical HST manipulator arm return mechanism, characterized in that: The invention comprises a fixed carrier (1), an operating plate (2) and an elastic extrusion return component (3), wherein the elastic extrusion return component (3) is mounted on the fixed carrier (1), one end of which is an extrusion end, one end of the operating plate (2) is connected to an HST flow control shaft (4) via an operating arm (21) vertically connected thereto, the other end of the operating plate (2) is provided with a V-shaped limit bayonet (22), the upper part of the other end of the operating plate (2) is connected to a foot pedal, the extrusion end of the elastic extrusion return component (3) is embedded in the limit bayonet (22), and is embedded in the V-shaped tip of the limit bayonet (22) when the foot pedal is not stepped on; the elastic extrusion return component (3) comprises a guide sleeve (31), a return ball ( The guide sleeve (31) is mounted on the fixed carrier (1), one end of which is close to the other end of the operating plate (2), the other end of the guide sleeve (31) is open, and both sides of the other end are provided with strip-shaped guide slots (311) extending from the end along the axial direction, the other end of the operating plate (2) is inserted through the guide slots (311) on both sides, the return ball (32) is arranged in the guide sleeve (31), the elastic extrusion member (33) is arranged inside the guide sleeve (31) and connected between the return ball (32) and the other end of the guide sleeve (31), the return ball (32) constitutes the extrusion end of the elastic extrusion return assembly (3).
2. A mechanical HST manipulator arm return mechanism according to claim 1, characterized in that: The elastic extrusion member (33) comprises a spring (331) and a limit plate (332), two ends of the spring (331) are respectively connected to the limit plate (332) and the other end of the guide sleeve (31), and the limit plate (332) is in contact with the return ball (32).
3. A mechanical HST manipulator arm return mechanism according to claim 2, characterized in that: The elastic extrusion return component (3) also includes an elastic force adjustment component (34), which is installed on the other end of the guide sleeve (31), and the two ends of the spring (331) are respectively connected to the limit plate (332) and the elastic force adjustment component (34), and the elastic force adjustment component (34) is used to adjust the compression elastic force of the spring (331) along the long axis direction of the guide sleeve (31).
4. A mechanical HST manipulator arm return mechanism according to claim 3, characterized in that: The elastic force adjustment component (34) comprises a blocking block (341), an adjusting bolt (342) and an adjusting block (343); the blocking block (341) is fixed in the open end of the other end of the guide sleeve (31); a screw hole is provided in the blocking block (341) along the long axis of the guide sleeve (31); the screw rod of the adjusting bolt (342) passes through the screw hole and extends into the other end of the guide sleeve (31); the adjusting bolt (342) is screwed into the screw hole; the adjusting block (343) is mounted on the screw end of the adjusting bolt (342); and the two ends of the spring (331) are respectively connected to the limit plate (332) and the adjusting block (343).
5. A mechanical HST manipulator arm return mechanism according to claim 4, characterized in that: The elastic force adjustment component (34) further comprises a locking nut (344), wherein the locking nut (344) is screwed onto the portion of the adjustment bolt (342) exposed outside the guide sleeve (31).
6. A mechanical HST manipulator arm return mechanism according to claim 1, characterized in that: The fixed carrier (1) comprises a fixed plate (11) and a mounting plate (12), wherein the mounting plate (12) is vertically connected to one end of the fixed plate (11), and one end of the guide sleeve (31) vertically passes through the mounting plate (12), and the guide sleeves (31) are connected and fixed to each other.
7. A mechanical HST manipulator arm return mechanism according to claim 6, characterized in that: A rib plate (13) perpendicular to one end of the fixing plate (11) and the mounting plate (12) is provided on one side of the connection between the two, and one end of the guide sleeve (31) is fitted and fixed on the rib plate (13).
8. A mechanical HST manipulator arm return mechanism according to any one of claims 1 to 7, characterized in that: An extension part (23) connected to a foot pedal is provided at the upper part of the other end of the control panel (2), and an assembly hole is provided through the extension part (23).
9. A tractor, characterized in that: It comprises a mechanical HST manipulator arm return mechanism as described in any one of claims 1 to 8.