Shift mechanism for agricultural machinery

Abstract

The utility model relates to the technical field of agricultural machinery, in particular to a gear shifting mechanism for agricultural machinery, and adopts the technical scheme that the gear shifting mechanism comprises a gearbox, a holding mechanism is mounted on the gearbox, a gear shift lever is mounted on the gearbox in a transmission manner, the gear shift lever and a change gear in the gearbox are mounted in a transmission manner, and a control mechanism is mounted on the gearbox. The control mechanism is used for controlling the gearbox, and a protection mechanism is arranged on the outer side of the control mechanism. The control mechanism comprises a gear lever, one end of the gear lever is rotationally installed on the gearbox, a fixing frame is installed on the gear lever, and one side of the fixing frame is in transmission installation with a gear lever on the gearbox through a connecting rod. A movable frame is installed on the blocking rod in a sliding mode, and a limiting rod is installed on the movable frame. The problems that in the prior art, when agricultural machinery shifts gears, the torque of a push rod is small, and operation is strenuous, difficult and dangerous under complex terrains and severe environments are solved.

Description

Technical Field

[0001] This invention relates to the field of agricultural machinery technology, specifically to a gear shifting mechanism for agricultural machinery. Background Technology

[0002] In recent years, with the improvement of agricultural mechanization, small agricultural machinery such as hand tractors have been increasingly widely used in complex terrains such as hilly areas, greenhouses, and orchards.

[0003] In existing technologies, gear shifting on hand-held tractors is achieved by the operator manually moving a gear shift lever, such as... Figure 8 As shown, when in use, the operator manually pushes and pulls the push rod 101 to push the push rod 101 to the designated position of the separation brake limit plate 102 to achieve gear shifting.

[0004] However, in existing technology, the push rod 101 has a relatively small torque, requiring the operator to overcome a significant mechanical resistance torque to complete gear shifting. This results in a somewhat jerky shifting experience for the user: when shifting up, the lever is too long and causes some interference; when shifting down, the lever requires navigating up, down, left, and right, and there's a tendency for the gear to jump out of gear while in neutral. In hilly or mountainous areas with complex terrain and harsh working environments, this laborious shifting operation further increases the difficulty and danger of operation.

[0005] To address the aforementioned problems, this invention proposes a gear shifting mechanism for agricultural machinery, which improves the gear shifting structure of agricultural machinery, making gear shifting easier and less strenuous. Summary of the Invention

[0006] The purpose of this invention is to design and provide a gear shifting mechanism for agricultural machinery, which has the advantages of reducing the mechanical resistance torque that the operator needs to overcome when shifting gears, improving the convenience and safety of gear shifting operations, and solving the problems of small push rod torque when shifting gears in agricultural machinery in the prior art, which makes operation laborious, difficult and dangerous in complex terrain and harsh environments.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a gear shifting mechanism for agricultural machinery, comprising a gearbox, a gripping mechanism mounted on the gearbox, a gear shift lever driven on the gearbox, the gear shift lever being driven by a gear shifting gear inside the gearbox, an operating mechanism mounted on the gearbox, the operating mechanism being used to control the gearbox, and a protective mechanism being provided on the outside of the operating mechanism;

[0008] The operating mechanism includes a gear lever, one end of which is rotatably mounted to the gearbox. A fixed bracket is mounted on the gear lever, and one side of the fixed bracket is connected to the gear shift lever on the gearbox via a connecting rod.

[0009] A movable frame is slidably mounted on the stop bar, and a limit rod is mounted on the movable frame;

[0010] A limit bracket is fixedly installed on the gearbox, and the limit bracket cooperates with the limit rod to limit the displacement of the gear lever.

[0011] Preferably, a universal joint is fixedly installed on the gearbox, the universal joint is fixedly connected to the gear lever, and the gear lever is rotatably installed with the gearbox through the universal joint.

[0012] In the design, the universal joint fixedly installed on the gearbox enables the rotational connection between the gear lever and the gearbox. The gear lever has the ability to swing in multiple directions through the universal joint. At the same time, the swing direction is limited by the shift groove. The use of the universal joint connection method reduces motion interference during the shifting process, making the operation more flexible and smooth.

[0013] Preferably, the gripping mechanism includes two gripping rods, which are fixedly connected by a crossbar. The two gripping rods are respectively connected to the gearbox fixing ring, and anti-slip handles are fixedly installed on both gripping rods.

[0014] The grip mechanism includes two grip bars fixedly connected by a crossbar. The grip bars provide a stable operating handle structure. The two grip bars are connected to the gearbox retaining ring respectively, thus providing reliable support strength. By installing anti-slip handles on the two grip bars, the operator's grip comfort and anti-slip performance are improved.

[0015] Preferably, an adjustment handle is fixedly installed on the gripping rod, and a pull rod is installed on the adjustment handle. The pull rod is used to adjust the position of the movable frame on the stop bar.

[0016] In the design, the adjustable handle fixedly installed on the grip lever enables convenient operation of the pull rod. The pull rod is used to adjust the position of the movable frame on the gear lever and has the ability to quickly adjust the limit state. At the same time, the linkage design between the adjustable handle and the pull rod makes the locking and unlocking operation during gear shifting more efficient.

[0017] Preferably, a first connecting frame is fixedly installed on the fixed frame, the first connecting frame is rotatably installed with the connecting rod, and the end of the connecting rod away from the first connecting frame is fixedly connected to the gear shift lever through a second connecting frame;

[0018] The fixed frame has a reserved hole for the pull rod to pass through. A sliding rod is slidably installed on the fixed frame and is fixedly connected to the movable frame.

[0019] In the design, the rotating installation of the first connecting frame and the connecting rod fixed on the fixed frame enables reliable transmission between the gear lever and the gear shift lever. The end of the connecting rod away from the first connecting frame is fixedly connected to the gear shift lever through the second connecting frame, giving it a stable torque transmission capability. The design of opening a reserved hole in the fixed frame for the pull rod to pass through, and opening and sliding the sliding rod, and fixing the sliding rod to the movable frame, ensures the coordination of the movement of each component.

[0020] Preferably, a spring element is fitted on the stop bar on the side opposite to the fixed frame of the movable frame, and the spring element is used to reset the movable frame.

[0021] In the design, a spring-loaded component is fitted on the stop bar on the opposite side of the movable frame and the fixed frame. The spring-loaded component enables the movable frame to automatically reset. The spring-loaded component is used to reset the movable frame and has the advantage of simplifying the operation process. The elastic reset design of the spring-loaded component allows the limit rod to be locked into the limit groove in time, improving the stability of gear shifting.

[0022] Preferably, the limiting frame has a limiting groove, and the end of the limiting rod away from the movable frame is movably inserted into the limiting groove.

[0023] In the design, the limiting groove on the limiting frame enables precise positioning of the limiting rod. The end of the limiting rod away from the movable frame is movably inserted into the limiting groove, which has the ability to prevent the lever from accidentally shifting. The combination of the limiting groove and the limiting rod ensures the reliability of the gear position of agricultural machinery under complex working conditions.

[0024] Preferably, the protective mechanism includes a protective cover, on which a first reserved slot is provided for the first connecting frame to pass through;

[0025] The protective cover is equipped with a shift cover, which has a shift groove for the shift lever to pass through and for displaying gear information. Below the shift groove, the shift cover has a second reserved groove for the pull rod to pass through.

[0026] In the design, the first reserved slot on the protective cover allows for the reservation and restriction of the movement space of the first connecting frame. The shift slot on the shift cover is used for the shift lever to pass through and to display the gear position information, which has the dual functions of operation indication and protection. The second reserved slot is designed for the pull rod to pass through, ensuring that the protective mechanism provides comprehensive protection without affecting operation.

[0027] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0028] This invention provides an operating mechanism, which includes a gear lever rotatably mounted to the gearbox. The fixed bracket on the gear lever is connected to the gear shift lever of the gearbox via a connecting rod. By utilizing the lever principle, the operating torque is increased, thereby reducing the mechanical resistance torque that the operator needs to overcome when shifting gears.

[0029] Meanwhile, a movable bracket is slidably installed on the gear lever, and the limit rod on the movable bracket cooperates with the limit bracket on the gearbox to precisely limit the displacement of the gear lever and improve the convenience of gear shifting operation;

[0030] In addition, a protective mechanism is installed on the outside of the control mechanism to protect it and improve operational safety.

[0031] This invention solves the problem mentioned in the background technology that the push rod torque is small when shifting gears in agricultural machinery, making operation laborious, difficult, and dangerous in complex terrain and harsh environments. It achieves the effect of reducing shifting resistance and making shifting convenient and safe.

[0032] The agricultural machinery shifting mechanism of the present invention has a simple structure, low cost, low modification cost for existing shifting mechanisms, and is applicable to almost all agricultural machinery, thus having high market value. Attached Figure Description

[0033] Figure 1 This is a schematic diagram of the main structure of the present invention;

[0034] Figure 2 This is a front view structural diagram of the present invention;

[0035] Figure 3 This is a schematic diagram of the operating mechanism of the present invention from one perspective;

[0036] Figure 4 This is a schematic diagram of the operating mechanism of the present invention from another perspective;

[0037] Figure 5 This is a schematic diagram of the gripping mechanism structure of the present invention;

[0038] Figure 6 This is a schematic diagram of the protective mechanism structure of the present invention;

[0039] Figure 7 This is a schematic diagram of the cooperation structure between the limiting rod and the limiting frame of the present invention;

[0040] Figure 8 This is a schematic diagram of the existing technology structure.

[0041] In the diagram: 1. Grip mechanism; 11. Grip lever; 111. Anti-slip handle; 12. Crossbar; 2. Operating mechanism; 21. Gear lever; 22. Adjustment lever; 221. Pull rod; 23. Fixed frame; 231. Reserved hole; 24. First connecting frame; 25. Movable frame; 251. Limiting rod; 252. Slide rod; 253. Elastic component; 26. Connecting rod; 27. Second connecting frame; 3. Gearbox; 31. Gear shift lever; 32. Universal joint; 33. Limiting frame; 331. Limiting groove; 4. Protective mechanism; 41. Protective cover; 411. First reserved groove; 42. Gear shift cover; 421. Gear shift groove; 422. Second reserved groove; 101. Push rod; 102. Limiting plate. Detailed Implementation

[0042] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Example 1

[0043] like Figures 1 to 7 As shown, one embodiment of the present invention is provided: a gear shifting mechanism for agricultural machinery, including a gearbox 3, a gripping mechanism 1 mounted on the gearbox 3, a gear shift lever 31 driven on the gearbox 3, the gear shift lever 31 being driven by a gear shifting gear inside the gearbox 3, an operating mechanism 2 mounted on the gearbox 3, the operating mechanism 2 being used to control the gearbox 3, and a protective mechanism 4 being provided on the outside of the operating mechanism 2.

[0044] The operating mechanism 2 includes a gear lever 21, one end of which is rotatably mounted to the gearbox 3. A fixing bracket 23 is mounted on the gear lever 21, and one side of the fixing bracket 23 is connected to the gear shift lever 31 on the gearbox 3 via a connecting rod 26.

[0045] A movable frame 25 is slidably mounted on the lever 21, and a limit rod 251 is mounted on the movable frame 25.

[0046] A limit bracket 33 is fixedly installed on the gearbox 3. The limit bracket 33 cooperates with the limit rod 251 to limit the displacement of the gear lever 21.

[0047] Specifically, by setting up an operating mechanism 2, which includes a gear lever 21 rotatably mounted to the gearbox 3, and a fixed bracket 23 on the gear lever 21 being connected to the gear shift lever 31 of the gearbox 3 via a connecting rod 26, the operating torque is increased by utilizing the lever principle, thereby reducing the mechanical resistance torque that the operator needs to overcome when shifting gears.

[0048] Meanwhile, a movable frame 25 is slidably installed on the gear lever 21. The limiting rod 251 on the movable frame 25 cooperates with the limiting frame 33 on the gearbox 3 to precisely limit the displacement of the gear lever 21 and improve the convenience of gear shifting operation.

[0049] In addition, a protective mechanism 4 is provided on the outside of the control mechanism 2 to protect the control mechanism 2 and improve operational safety.

[0050] This invention solves the problem in the background technology that the push rod torque is small when shifting gears in agricultural machinery, making operation difficult, dangerous, and laborious in complex terrain and harsh environments. It achieves the effect of reducing shifting resistance and making shifting convenient and safe. Example 2

[0051] To optimize the flexibility and ease of operation of the gear lever transmission, such as Figure 1 Figure 2 , Figure 3 and Figure 7 As shown in this embodiment, in the operating mechanism 2, a universal joint 32 is fixedly installed on the gearbox 3. The universal joint 32 is fixedly connected to the gear lever 21, allowing the gear lever 21 to be rotatably installed, which has the characteristics of multi-directional swing and reduced interference of gear shifting movement.

[0052] The first connecting frame 24 is fixedly installed on the fixed frame 23. The first connecting frame 24 and the connecting rod 26 are rotatably installed. The end of the connecting rod 26 away from the first connecting frame 24 is fixedly connected to the gear shift lever 31 through the second connecting frame 27, so as to realize stable torque transmission between the gear shift lever 21 and the gear shift lever 31.

[0053] The gripping mechanism 1 includes two gripping rods 11, which are fixedly connected by a crossbar 12. The gripping rods 11 are connected to the fixing ring of the gearbox 3 and are also equipped with anti-slip handles 111. An adjustment handle 22 is fixed on the gripping rods 11, and the pull rod 221 on it can pass through the reserved hole 231 and adjust the position of the movable frame 25 on the stop lever 21, so as to efficiently complete the locking and unlocking operations. The adjustment handle 22 has a built-in ratchet mechanism. When the adjustment handle 22 is rotated, the pull rod 221 drives the movable frame 25 to move, and the locking pawl engages with the ratchet, so as to achieve precise adjustment for each stroke. Example 3

[0054] To improve gear stability and ease of resetting after shifting, such as Figures 4 to 7 As shown, in this embodiment, a movable frame 25 is slidably mounted on the stop lever 21, and a slide rod 252 is slidably mounted on the fixed frame 23 with an opening. The slide rod 252 and the movable frame 25 are fixed to ensure coordinated movement of the components.

[0055] The movable frame 25 and the fixed frame 23 are connected to the stop lever 21 on the opposite side of the stop lever 21. The stop lever 21 is fitted with a spring element 253, which allows the movable frame 25 to automatically return to its original position. The spring element 253 is designed as a compression spring, and its two ends are elastically connected to the movable frame 25 and the fixed frame 23 respectively. After the fixed frame 23 and the stop lever 21 are fixedly installed, only the movable frame 25 can slide along the stop lever 21.

[0056] The limiting rod 251 on the movable frame 25 cooperates with the limiting groove 331 opened in the upper limit frame 33 of the gearbox 3. The end of the limiting rod 251 facing away from the movable frame 25 is inserted into the limiting groove 331, accurately limiting the displacement of the gear lever 21 and avoiding unexpected gear changes under complex working conditions. A permanent magnet adsorption block is embedded at the bottom of the limiting groove 331 to guide the limiting rod 251 into the groove accurately. Example 4

[0057] To achieve the dual functions of protection and operational visualization of the gear shifting mechanism, such as Figure 1 , Figure 6 and Figure 7 As shown, in this embodiment, the protective cover 41 of the protective mechanism 4 has a first reserved slot 411 for the first connecting frame 24 to pass through, reserving and restricting its movement space.

[0058] The shift cover 42 installed on the protective cover 41 has a shift groove 421 for the shift lever 21 to pass through and display gear information, serving both operation guidance and protection functions; the second reserved groove 422 below the shift groove 421 allows the pull rod 221 to pass through, ensuring comprehensive protection without affecting operation. The shift cover 42 has gear position markings and a luminous coating on its surface.

[0059] When using this invention, the operator holds the anti-slip handles 111 of the two gripping rods 11 with both hands. The anti-slip handles 111 provide a stable grip. At this time, the gear lever 21 is in the initial gear position, i.e., neutral, in the middle of the gear shift groove 421. The limiting rod 251 is inserted into the limiting groove 331 of the limiting frame 33 and is kept in the inserted state by the elastic member 253.

[0060] When performing gear shifting, first, press the adjustment handle 22 with your right index finger, and the movable frame 25 will slide on the gear lever 21 through the pull rod 221, so that the limit rod 251 disengages from the limit groove 331, and the elastic element 253 is compressed at this time.

[0061] Then, hold the grip lever 11 with your left hand to stabilize the machine body, and push the gear lever 21 with your right hand to swing left and right in the shift groove 421. The gear lever 21 rotates in a straight line through the universal joint 32 and the shift groove 421. At the same time, the fixed frame 23 drives the gear shift lever 31 to rotate through the first connecting frame 24, the connecting rod 26 and the second connecting frame 27, thereby switching the gear meshing state in the gearbox 3.

[0062] During the pushing process, the slide bar 252 slides in the hole of the fixed frame 23 to ensure that the movable frame 25 slides along the stop bar 21.

[0063] When the gear lever 21 reaches the target gear, the adjustment handle 22 is released, the elastic element 253 resets and pushes the movable frame 25, so that the limit rod 251 is inserted into the corresponding limit groove 331, and the gear is locked.

[0064] After the operation is completed, push the lever 21 back to the neutral position, and the limit lever 251 will be engaged in the neutral limit groove 331 of the limit frame 33.

[0065] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A gear shifting mechanism for agricultural machinery, comprising a gearbox (3), a gripping mechanism (1) mounted on the gearbox (3), a gear shift lever (31) driven on the gearbox (3), the gear shift lever (31) being driven by a gear shifting gear inside the gearbox (3), an operating mechanism (2) mounted on the gearbox (3), the operating mechanism (2) being used to control the gearbox (3), and a protective mechanism (4) provided on the outside of the operating mechanism (2), characterized in that: The operating mechanism (2) includes a gear lever (21), one end of which is rotatably mounted to the gearbox (3). A fixing frame (23) is mounted on the gear lever (21), and one side of the fixing frame (23) is connected to the gear shift lever (31) on the gearbox (3) via a connecting rod (26). A movable frame (25) is slidably mounted on the stop bar (21), and a limit rod (251) is mounted on the movable frame (25). A limit bracket (33) is fixedly installed on the gearbox (3). The limit bracket (33) cooperates with the limit rod (251) to limit the displacement of the gear lever (21).

2. The shift mechanism for an agricultural machine of claim 1, wherein, A universal joint (32) is fixedly installed on the gearbox (3). The universal joint (32) is fixedly connected to the gear lever (21). The gear lever (21) is rotatably installed on the gearbox (3) through the universal joint (32).

3. The shift mechanism for an agricultural machine of claim 1, wherein, The gripping mechanism (1) includes gripping rods (11), and there are two gripping rods (11). The two gripping rods (11) are fixedly connected by a crossbar (12). The two gripping rods (11) are respectively connected to the gearbox (3) fixing ring. Anti-slip handles (111) are fixedly installed on both gripping rods (11).

4. The shift mechanism for an agricultural machine of claim 3, wherein, An adjustment handle (22) is fixedly installed on the grip (11), and a pull rod (221) is installed on the adjustment handle (22). The pull rod (221) is used to adjust the position of the movable frame (25) on the stop bar (21).

5. The shift mechanism for an agricultural machine of claim 1, wherein, A first connecting frame (24) is fixedly installed on the fixed frame (23). The first connecting frame (24) and the connecting rod (26) are rotatably installed. The end of the connecting rod (26) away from the first connecting frame (24) is fixedly connected to the gear shift lever (31) through the second connecting frame (27). The fixed frame (23) has a reserved hole (231) for the pull rod (221) to pass through. The fixed frame (23) has a hole and a sliding rod (252) is slidably installed. The sliding rod (252) is fixedly connected to the movable frame (25).

6. The shift mechanism for an agricultural machine of claim 1, wherein, A spring element (253) is fitted on the stop bar (21) on the opposite side of the movable frame (25) and the fixed frame (23). The spring element (253) is used to reset the movable frame (25).

7. The shift mechanism for an agricultural machine of claim 1, wherein, The limiting frame (33) has a limiting groove (331), and the end of the limiting rod (251) facing away from the movable frame (25) is movably inserted into the limiting groove (331).

8. The shift mechanism for an agricultural machine of claim 1, wherein, The protective mechanism (4) includes a protective cover (41), on which a first reserved slot (411) is provided, for the first connecting frame (24) to pass through; The protective cover (41) is equipped with a shift cover (42), and the shift cover (42) has a shift groove (421). The shift groove (421) is used for the gear lever (21) to pass through and for displaying gear information. The shift cover (42) below the shift groove (421) has a second reserved groove (422), which is used for the pull rod (221) to pass through.

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