Variable speed control mechanism and tractor with same

Abstract

The utility model relates to the technical field of agricultural equipment, in particular to a variable speed control mechanism and a tractor with the same. The variable-speed control mechanism comprises a control rod, a control arm, a mounting seat, an upper pull fork, a length-adjustable pull rod assembly and a lower pull fork, the control arm is rotatably mounted on one side of the mounting seat, the lower end of the control rod is fixedly connected with the control arm, the lower end of the control arm is movably connected with the upper pull fork, and the upper pull fork is movably connected with the mounting seat. The upper end of the pull rod assembly is fixedly connected with the upper pull fork, and the lower end of the pull rod assembly is movably connected with the lower pull fork. The pull rod assembly has the advantages that the structural design is simple and reasonable, the two ends of the pull rod assembly are of pull fork hinged structures, the length of the whole pull rod assembly is adjustable, the pull rod assembly can be matched with the gear shifting stroke, and the problems of gear shifting idle stroke and unclear gear engaging are effectively solved.

Description

Technical Field

[0001] The utility model relates to the technical field of agricultural machinery and equipment, in particular to a speed change control mechanism and a tractor with the same. Background Art

[0002] At present, the speed control mechanism in the existing tractors mostly adopts the structure of pull rod plus ball head connection. Due to the angular gap when the joystick pushes and pulls the ball head, there will be an idle control stroke, which will affect the shifting feel and cause unclear gear switching.

[0003] Based on this, it is necessary to develop a new speed change control mechanism to overcome the above-mentioned technical problems. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide a speed change control 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 speed control mechanism comprises an operating lever, an operating arm, a mounting seat, an upper pull fork, a pull rod assembly with adjustable length and a lower pull fork. The operating arm is rotatably mounted on one side of the mounting seat, the lower end of the operating lever is connected and fixed to the operating arm, the lower end of the operating arm is movably connected to the upper pull fork, the upper end of the pull rod assembly is connected and fixed to the upper pull fork, and the lower end of the pull rod assembly is movably connected to the lower pull fork.

[0007] On the basis of the above technical solution, the present invention can also be improved as follows.

[0008] Furthermore, the above-mentioned operating arm is a vertically arranged sheet-like component, which is abutted against one side of the above-mentioned mounting seat. A sleeve seat is vertically provided on the side of the above-mentioned operating arm away from the above-mentioned mounting seat. A rotating shaft rotatably connected to the above-mentioned mounting seat is passed through the above-mentioned sleeve seat, and the lower end of the above-mentioned operating rod is connected and fixed to the upper part of the above-mentioned sleeve seat.

[0009] Furthermore, the lower end of the operating arm is integrally formed with an L-shaped connecting portion protruding toward one side thereof, and the end of the connecting portion extends into the upper pull-up fork and is rotatably connected to the upper pull-up fork via a pin shaft.

[0010] Furthermore, the pull rod assembly comprises a pull rod and a length adjustment assembly, the upper end of the pull rod is fixedly connected to the upper pull fork, and the lower end of the pull rod is movably connected to the lower pull fork via the length adjustment assembly.

[0011] Furthermore, the above-mentioned length adjustment assembly includes a vertically arranged adjustment sleeve, the above-mentioned adjustment sleeve is provided with a threaded through hole running through it from top to bottom, the lower end of the above-mentioned pull rod is provided with a first threaded section, the above-mentioned first threaded section is screwed into the upper end of the above-mentioned adjustment sleeve, the above-mentioned first threaded section is screwed with a first locking nut, and the above-mentioned pull-down fork is connected to the lower end of the above-mentioned adjustment sleeve.

[0012] Furthermore, a vertically extending lower connecting column is provided at the upper end of the pull-down fork, a thread is provided on the outside of the lower connecting column, the upper end of the lower connecting column is screwed into the lower end of the adjusting sleeve, and a second locking nut is screwed onto the lower connecting column.

[0013] Furthermore, the pull rod comprises an inclined section and vertical sections arranged at the upper and lower ends of the inclined section.

[0014] Furthermore, a vertically extending upper connecting column is provided at the lower end of the upper pull fork, an internal threaded hole is coaxially provided in the upper connecting column, a third threaded section is provided at the upper end of the pull rod, the third threaded section is screwed into the internal threaded hole, and a third locking nut is screwed on the third threaded section.

[0015] Furthermore, the middle portion of the joystick has a middle section bent toward the other side of the mounting seat.

[0016] The beneficial effects of the utility model are: the structural design is simple and reasonable, both ends of the pull rod assembly are all equipped with a pull fork hinge structure, and the length of the entire pull rod assembly is adjustable to match the gear shifting stroke, effectively solving the problems of gear shifting empty stroke and unclear gear shifting.

[0017] A tractor is also provided, comprising a speed-changing operating mechanism. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of the speed change control mechanism of the utility model;

[0019] Figure 2 It is a structural side view of the speed change operating mechanism of the utility model.

[0020] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0021] 1. Joystick; 2. Joystick arm; 3. Mounting seat; 4. Upper pull fork; 5. Pull rod; 6. Length adjustment assembly; 7. Lower pull fork; 21. Sleeve seat; 22. Connecting part; 41. Upper connecting column; 42. Third locking nut; 61. Adjusting sleeve; 62. First locking nut; 63. Second locking nut; 71. Lower connecting column. DETAILED DESCRIPTION

[0022] 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.

[0023] Example 1

[0024] like Figure 1 and 2 As shown, the speed control mechanism of this embodiment includes an operating lever 1, an operating arm 2, a mounting seat 3, an upper pull fork 4, a pull rod assembly with adjustable length and a lower pull fork 7. The operating arm 2 is rotatably mounted on one side of the mounting seat 3, the lower end of the operating lever 1 is connected and fixed to the operating arm 2, the lower end of the operating arm 2 is movably connected to the upper pull fork 4, the upper end of the pull rod assembly is connected and fixed to the upper pull fork 4, and the lower end of the pull rod assembly is movably connected to the lower pull fork 7.

[0025] In the speed control mechanism of the present embodiment, the mounting seat 3 is fixedly mounted at a suitable position in the tractor, and the pull-down fork 7 is movably connected to the shift rocker arm (denoted by a in the figure). Since the lower end of the operating lever 1 is connected and fixed to the operating arm 2, the operating arm 2 is rotatably mounted on one side of the mounting seat 3. At the same time, the lower end of the mounting seat 3 is movably connected to the upper pull fork 4. At the same time, the length of the pull rod assembly in the middle part is adjustable. Therefore, during the gear shifting process, the operating lever 1 drives the operating arm 2 to rotate around the rotation point with the mounting seat 3, which will pull the pull rod assembly upward, and the pull rod assembly will transmit the force to the pull-down fork 7, thereby driving the shift rocker arm movably connected to the pull-down fork to move to achieve gear shifting. The entire structural design is simple and reasonable. Both ends of the pull rod assembly adopt a pull fork hinge structure, and the overall pull rod assembly length is adjustable, which can match the gear shifting stroke, effectively solving the problems of idle gear shifting stroke and unclear gear shifting.

[0026] In this embodiment, the mounting seat 3 is a vertically arranged sheet metal part, which is fixed at an adapted position in the tractor by bolts.

[0027] As a preferred embodiment, the above-mentioned operating arm 2 is a vertically arranged sheet-like component, which is abutted against one side of the above-mentioned mounting seat 3. The side of the above-mentioned operating arm 2 facing away from the above-mentioned mounting seat 3 is vertically provided with a sleeve seat 21, and the above-mentioned sleeve seat 21 is penetrated by a rotating shaft rotatably connected to the above-mentioned mounting seat 3, and the lower end of the above-mentioned operating rod 1 is connected and fixed to the upper part of the above-mentioned sleeve seat 21.

[0028] In the above implementation scheme, the operating arm 2 is a sheet metal part that is in contact with the mounting seat 3, and a sleeve seat 21 is integrally provided on one side thereof. A rotating shaft is passed through the sleeve seat 21 and connected to the mounting seat 3 to realize the rotation of the sleeve seat 21 relative to the rotation, that is, during the gear shifting process, the entire operating arm 2 rotates around the rotating shaft. Its structural design is relatively compact and the installation is stable.

[0029] As a preferred embodiment, the lower end of the operating arm 2 is integrally formed with an L-shaped connecting portion 22 protruding toward one side thereof, and the end of the connecting portion 22 extends into the upper pull-up fork 4 and is rotatably connected to the upper pull-up fork 4 via a pin shaft.

[0030] In the above embodiment, the L-shaped design of the connecting portion 22 allows the end thereof to smoothly extend into the U-shaped fork arm of the upper pull-up fork 4, thereby being rotatably connected to the U-shaped fork arm of the upper pull-up fork 4 through a pin shaft passing through the connecting portion 22. The structural design is compact, and the two can be well connected, and the relative rotation after connection is also relatively smooth.

[0031] As a preferred embodiment, the pull rod assembly includes a pull rod 5 and a length adjustment assembly 6, the upper end of the pull rod 5 is connected and fixed to the upper pull fork 4, and the lower end thereof is movably connected to the lower pull fork 7 via the length adjustment assembly 6.

[0032] In the above implementation scheme, the pull rod 5 adopts the conventional pull rod in the speed control mechanism of the tractor. The upper end of the pull rod is connected and fixed to the upper pull fork 4, and the lower end is connected to the length adjustment component 6. The length of the length adjustment component 6 is used to adjust the length of the entire pull rod assembly, thereby achieving a height match between the entire control mechanism and the gear shift stroke. Its structural design is simple and reasonable.

[0033] As a preferred embodiment, the length adjustment assembly 6 includes a vertically arranged adjustment sleeve 61, a threaded through hole is provided in the adjustment sleeve 61 which passes through it from top to bottom, a first threaded section is provided at the lower end of the pull rod 5, the first threaded section is screwed into the upper end of the adjustment sleeve 61, a first locking nut 62 is screwed on the first threaded section, and the pull-down fork 7 is connected to the lower end of the adjustment sleeve 61.

[0034] In the above embodiment, when adjusting the length of the length adjustment assembly 6, loosen the first locking nut 62, and then operate the pull rod 5 and the adjusting sleeve 61 to rotate relative to each other. After adjustment, tighten the first locking nut 62 so that the first locking nut 62 is abutted against or close to the upper end of the adjusting sleeve 61, thereby realizing the length adjustment of the entire pull rod assembly. The structure is simple in design and the operation is relatively convenient and quick.

[0035] As a preferred embodiment, the upper end of the pull-down fork 7 is provided with a vertically extending lower connecting column 71, the lower connecting column 71 is provided with a thread on the outside, the upper end of the lower connecting column 71 is screwed into the lower end of the adjusting sleeve 61, and a second locking nut 63 is screwed on the lower connecting column 71.

[0036] In the above embodiment, when adjusting the length, the second locking nut 63 can be loosened, and the pull-down fork 7 can be operated to rotate relative to the adjustment sleeve 61. After the length adjustment is achieved, the second locking nut 63 is operated to rotate until it abuts against or approaches the lower end of the adjustment sleeve 61, thereby achieving the length adjustment of the entire pull rod assembly. The structure is simple in design and the operation is relatively convenient and quick. Of course, when adjusting the length, the upper and lower parts can be adjusted synchronously (the adjustment sleeve 61 rotates relative to the upper pull fork 4 and the lower pull fork 7).

[0037] In this embodiment, the pull rod 5 includes an inclined section and vertical sections arranged at the upper and lower ends of the inclined section. The shape matches the shape of the tractor transmission mechanism and is easy to assemble and avoid.

[0038] As a preferred embodiment, the lower end of the upper pull fork 4 is provided with a vertically extending upper connecting column 41, an internal threaded hole is coaxially provided inside the upper connecting column 41, and the upper end of the pull rod 5 is provided with a third threaded section, the third threaded section is screwed into the internal threaded hole, and a third locking nut 42 is screwed on the third threaded section.

[0039] In the above embodiment, when assembling, after the third threaded section is screwed into place with the internal threaded hole of the upper connecting column 41, the third locking nut 42 is screwed to achieve locking. When disassembling, the reverse operation is performed. This structural design facilitates the rapid disassembly and assembly of the upper pull fork 4 and the pull rod 5.

[0040] In this embodiment, the middle of the joystick 1 has a middle section bent toward the other side of the mounting seat 3. This shape design is compatible with the tractor speed change mechanism, easy to install and avoid other components.

[0041] In this embodiment, an adaptable gear lever is provided at the upper end of the joystick 1 .

[0042] Example 2

[0043] The tractor of this embodiment includes the speed change control mechanism of the first embodiment.

[0044] 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.

[0045] 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.

[0046] 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.

[0047] 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.

[0048] 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.

[0049] 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 speed control mechanism, characterized in that: The invention comprises an operating rod (1), an operating arm (2), a mounting seat (3), an upper pull fork (4), a pull rod assembly with adjustable length and a lower pull fork (7); the operating arm (2) is rotatably mounted on one side of the mounting seat (3); the lower end of the operating rod (1) is connected and fixed to the operating arm (2); the lower end of the operating arm (2) is movably connected to the upper pull fork (4); the upper end of the pull rod assembly is connected and fixed to the upper pull fork (4); and the lower end of the pull rod assembly is movably connected to the lower pull fork (7).

2. A speed shift mechanism according to claim 1, characterized in that: The operating arm (2) is a vertically arranged sheet-like component, which is close to one side of the mounting seat (3). A sleeve seat (21) is vertically arranged on the side of the operating arm (2) away from the mounting seat (3). A rotating shaft rotatably connected to the mounting seat (3) is passed through the sleeve seat (21). The lower end of the operating rod (1) is connected and fixed to the upper part of the sleeve seat (21).

3. A speed shift mechanism according to claim 2, characterized in that: The lower end of the operating arm (2) is integrally formed with an L-shaped connecting portion (22) protruding toward one side thereof, and the end of the connecting portion (22) extends into the upper pull-up fork (4) and is rotatably connected to the upper pull-up fork (4) via a pin shaft.

4. A speed shift operating mechanism according to claim 1, characterized in that: The pull rod assembly comprises a pull rod (5) and a length adjustment assembly (6); the upper end of the pull rod (5) is fixedly connected to the upper pull fork (4), and the lower end of the pull rod (5) is movably connected to the lower pull fork (7) via the length adjustment assembly (6).

5. A speed shift operating mechanism according to claim 4, characterized in that: The length adjustment assembly (6) includes a vertically arranged adjustment sleeve (61), wherein the adjustment sleeve (61) is provided with a threaded through hole extending therethrough from top to bottom, and the lower end of the pull rod (5) is provided with a first threaded section, which is screwed into the upper end of the adjustment sleeve (61), and a first locking nut (62) is screwed into the first threaded section, and the pull-down fork (7) is connected to the lower end of the adjustment sleeve (61).

6. A speed shift mechanism according to claim 5, characterized in that: The upper end of the pull-down fork (7) is provided with a vertically extending lower connecting column (71), the outer surface of the lower connecting column (71) is provided with a thread, the upper end of the lower connecting column (71) is screwed into the lower end of the adjusting sleeve (61), and a second locking nut (63) is screwed into the lower connecting column (71).

7. A speed shift operating mechanism according to claim 4, characterized in that: The pull rod (5) comprises an inclined section and vertical sections arranged at the upper and lower ends of the inclined section.

8. A speed shift operating mechanism according to claim 4, characterized in that: The lower end of the upper pull fork (4) is provided with an upper connecting column (41) extending vertically, and an internal threaded hole is coaxially provided inside the upper connecting column (41). The upper end of the pull rod (5) is provided with a third threaded section, and the third threaded section is screwed into the internal threaded hole, and a third locking nut (42) is screwed onto the third threaded section.

9. A speed shift operating mechanism according to any one of claims 1 to 8, characterized in that: The middle portion of the joystick (1) has a middle section bent toward the other side of the mounting seat (3).

10. A tractor, characterized in that: It comprises a speed shift operating mechanism as claimed in any one of claims 1 to 9.

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