Power harrow gearbox and agricultural machine

Abstract

The application belongs to the technical field of agricultural machinery, and particularly relates to a power harrow gearbox and agricultural machinery. The power harrow gearbox comprises a gearbox shell, a gear position gear and a shift lever assembly. The gearbox shell is provided with a gear position limiting hole. The shift lever assembly comprises an inner shift lever, a connecting pin shaft and an outer shift lever. The inner shift lever and the outer shift lever are both sleeved and fixed on the connecting pin shaft and are rotationally connected to the gearbox shell through the connecting pin shaft. The inner shift lever is located in the gearbox shell and is formed with a shift fork groove for moving a sliding gear. The outer shift lever is provided with a limiting pin shaft for plug-in cooperation with the gear position limiting hole. When gear shifting is needed, the limiting pin shaft is pulled out of the gear position limiting hole, the outer shift lever is then shifted and the inner shift lever is driven to rotate through the connecting pin shaft, so as to drive the sliding gear to be connected to the corresponding gear position gear. After the gear shifting is completed, the limiting pin shaft is plug-in cooperated with the gear position limiting hole at the corresponding position, so as to complete the locking of the gear position, thereby avoiding gear position disengagement.

Description

Technical Field

[0001] This application belongs to the technical field of agricultural machinery, specifically relating to a power harrow gearbox and agricultural machinery. Background Technology

[0002] The power harrow is a crucial soil tillage and seedbed preparation implement in modern precision agriculture. Its core feature is the active rotation of its working parts driven by the tractor's power take-off shaft, enabling forced and efficient soil treatment. The power harrow integrates fine soil breaking, uniform mixing, leveling, and compaction. Its active drive and selectable forward and reverse rotation capabilities allow it to adapt to various soil conditions, from light to heavy clay, producing ideal field surfaces that meet the requirements of modern precision seeding. It is not only a tool for improving tillage efficiency but also a key piece of equipment for achieving precision and conservation agriculture. The power harrow gearbox is the core component, responsible for transmitting and distributing the tractor's power to the various working parts of the harrow, and matching speed and steering.

[0003] In the existing technology, the power rake gearbox adopts the shift fork method. The shift fork component moves the shift fork disc to move the sliding gear, and at the same time, it drives the rotating disc to rotate. The shift position can only be indirectly judged by the magnitude of the shift force of the shift fork component. After the spring force decays, it is easy to disengage. There is no gear self-locking function, which leads to the problem of gear disengagement. Utility Model Content

[0004] The purpose of this application is to provide a power harrow gearbox and agricultural machinery that aims to avoid the problem of gear disengagement.

[0005] To achieve the above objectives, this application provides a power rake gearbox, comprising: The gearbox housing is provided with gear position limiting holes; There are several gears, each corresponding to a different gear. A sliding gear, used to connect with different gears to switch between different gears; The shift lever assembly includes an inner shift lever, a connecting pin, and an outer shift lever. Both the inner and outer shift levers are sleeved and fixed on the connecting pin and rotatably connected to the gearbox housing through the connecting pin. The inner shift lever is located inside the gearbox housing and forms a shift fork groove for moving the sliding gear. The outer shift lever is equipped with a limiting pin for engaging with the gear position limiting hole.

[0006] In some embodiments, a through hole is formed on the outer lever, a spring is disposed in the through hole, a limiting protrusion is formed on the inner peripheral wall of the through hole, a limiting pin passes through the through hole and forms a limiting slot, and the spring is located between the limiting protrusion and the limiting slot.

[0007] In some embodiments, a pressure plate is provided at the end of the limiting pin away from the gearbox housing, and the pressure plate is engaged with the outer lever for limiting.

[0008] In some embodiments, the pressure plate is sleeved on the limiting pin, and the pressure plate and the limiting pin are connected by a first cotter pin.

[0009] In some embodiments, there are two gears, namely a first gear and a third gear. The first gear and the third gear are respectively sleeved on both ends of the input shaft by bearings. The sliding gear is axially movable on the input shaft and located between the first gear and the third gear. The inner lever is used to move the sliding gear along the axial direction. The gearbox housing has a first gear limiting hole and a third gear limiting hole.

[0010] In some embodiments, the first gear and the third gear are symmetrically arranged at both ends of the input shaft, and the first gear limiting hole and the third gear limiting hole are symmetrically arranged on both sides of the limiting pin.

[0011] In some embodiments, a second gear limiting hole is also formed on the gearbox housing, the second gear limiting hole, the first gear and the third gear are located on the same arc, and the first gear and the third gear are symmetrically arranged on both sides of the second gear limiting hole.

[0012] In some embodiments, both ends of the sliding gear are provided with shift grooves, and the end face of the gear gear facing the sliding gear is provided with a shift boss, which is used to engage with the shift grooves.

[0013] In some embodiments, the inner lever includes a fork portion, an inner lever body, and a first elastic retaining ring. The fork portion has a fork groove. The fork portion is inserted into one end of the inner lever body. The first elastic retaining ring is sleeved on the fork portion and engages with the inner lever body for limiting. The other end of the inner lever body is sleeved on the connecting pin. The outer lever includes an outer lever body and a grip portion. The grip portion is disposed at one end of the outer lever body, and the other end of the outer lever body is sleeved on the connecting pin and connected by a second cotter pin.

[0014] The connecting pin is mounted on the gearbox housing via a connecting bushing, and a sealing ring is provided between the connecting bushing and the connecting pin.

[0015] Another aspect of this application provides an agricultural machine including the power harrow gearbox described above.

[0016] The power harrow gearbox and agricultural machinery provided in this application, through the above technical solutions, have the following beneficial effects: When shifting gears, pull the limit pin out of the gear limit hole, then move the outer lever and drive the inner lever to rotate through the connecting pin, so as to drive the sliding gear to connect with the corresponding gear gear. After shifting gears, insert the limit pin into the corresponding gear limit hole to lock the gear and prevent the gear from disengaging.

[0017] Other features and advantages of the embodiments of this application will be described in detail in the following detailed description section. Attached Figure Description

[0018] The accompanying drawings are provided to further illustrate the embodiments of this application and form part of the specification. They are used together with the following detailed description to explain the embodiments of this application, but do not constitute a limitation on the embodiments of this application. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without any inventive effort. In the drawings: Figure 1 This is a front view of the power rake gearbox according to a specific embodiment of this application; Figure 2 This is a cross-sectional view of the power rake gearbox according to a specific embodiment of this application; Figure 3 This is a positional diagram of the sliding gear and the gear shifting gear according to a specific embodiment of this application.

[0019] Explanation of reference numerals in the attached figures 100. Power rake gearbox; 1. Shift fork; 2. Inner shift lever; 3. First elastic retaining ring; 4. Connecting bushing; 5. Sealing ring; 6. Connecting pin; 7. Second cotter pin; 8. Second elastic retaining ring; 9. Outer shift lever; 10. Spring; 11. First cotter pin; 12. Limiting pin; 13. Pressure plate; 14. Gearbox housing; 15. Third gear; 16. Sliding gear; 17. First gear; 18. Input shaft; 19. Bearing; 20. Gear limiting hole. Detailed Implementation

[0020] The specific embodiments of this application will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit this application.

[0021] The terminology of the power harrow gearbox 100 and agricultural machinery equipment according to this application is described below with reference to the accompanying drawings.

[0022] like Figure 1 and Figure 2As shown, a specific embodiment of this application provides a power rake gearbox 100, including a gearbox housing 14, gears, and a lever assembly. The gearbox housing 14 is provided with a gear limiting hole 20. The number of gears is several and corresponds to different gears. A sliding gear 16 is used to connect with different gears to switch different gears. The lever assembly includes an inner lever 2, a connecting pin 6, and an outer lever 9. The inner lever 2 and the outer lever 9 are both sleeved and fixed on the connecting pin 6 and rotatably connected to the gearbox housing 14 through the connecting pin 6. The inner lever 2 is located inside the gearbox housing 14 and forms a shift fork groove for moving the sliding gear 16. A limiting pin 12 for inserting and cooperating with the gear limiting hole 20 is installed on the outer lever 9.

[0023] Different speeds of the power rake are suitable for different working modes to adapt to different soil conditions and operational requirements. The power rake gearbox 100 is used to transmit and distribute power to the various working parts of the power rake and to match the speed and direction. In this application, the sliding gear 16 can output different speeds when connected to different gears. When shifting gears, the limiting pin 12 is pulled out from the gear limiting hole 20, and then the outer lever 9 is moved to drive the inner lever 2 to rotate through the connecting pin 6, thereby driving the sliding gear 16 to connect with the corresponding gear. After shifting gears, the limiting pin 12 is inserted into the corresponding gear limiting hole 20 to lock the gear and prevent the gear from disengaging.

[0024] In some embodiments, a through hole is formed on the outer lever 9, and a spring 10 is disposed inside the through hole. A limiting protrusion is formed on the inner peripheral wall of the through hole, and a limiting pin 12 passes through the through hole and forms a limiting slot. The spring 10 is located between the limiting protrusion and the limiting slot. The spring 10 applies a reset force to the limiting slot to push the limiting pin 12 against the power rake gearbox 100, so as to ensure that the limiting pin 12 is always engaged with the gear limiting hole 20 without being pulled out, thereby avoiding accidental pull-out of the limiting pin 12 and improving the reliability of the power rake gearbox 100.

[0025] Specifically, the limiting pin 12 is inserted into the through hole perpendicular to the outer lever 9. When it is necessary to switch gears, the limiting pin 12 is pulled out away from the gearbox housing 14 and the spring 10 is compressed. When the gear switching is completed, the limiting pin 12 is released, and the spring 10 will drive the limiting pin 12 to be inserted into the gear limit hole 20. The spring 10 can not only automatically realize the insertion of the limiting pin 12 into the gear limit hole 20, but also press the limiting pin 12 tightly in the gear limit hole 20.

[0026] Furthermore, a pressure plate 13 is provided at the end of the limiting pin 12 away from the gearbox housing 14, and the pressure plate 13 is engaged with the outer lever 9 for limiting. The limiting engagement between the pressure plate 13 and the outer lever 9 prevents the limiting pin 12 from being pushed out of the through hole by the spring 10, thereby preventing the limiting pin 12 from separating from the outer lever 9, and thus improving the reliability of the power rake gearbox 100.

[0027] Furthermore, the pressure plate 13 is sleeved on the limiting pin 12, and the pressure plate 13 and the limiting pin 12 are connected by a first cotter pin 11. The first cotter pin 11 enables the opening and closing connection between the pressure plate 13 and the limiting pin 12, allowing the limiting pin 12 to be removed from the through hole and the spring 10 with reduced elasticity to be replaced, thereby maintaining the restoring force applied by the spring 10 to the limiting pin 12, and thus improving the reliability of the power rake gearbox 100.

[0028] like Figure 3 As shown in the specific embodiment of this application, there are two gears, namely a first gear 17 and a third gear 15. The first gear 17 and the third gear 15 are respectively sleeved on both ends of the input shaft 18 through bearings 19. A sliding gear 16 is axially movably disposed on the input shaft 18 and located between the first gear 17 and the third gear 15. The inner lever 2 is used to move the sliding gear 16 axially. A first gear limiting hole and a third gear limiting hole are formed on the gearbox housing 14. When the sliding gear 16 moves to connect with the first gear 17, the power rake gearbox 100 switches to the first gear. When the sliding gear 16 moves to connect with the third gear 15, the power rake gearbox 100 switches to the third gear. When the sliding gear 16 is located in the middle position of the input shaft 18 and is not connected to the first gear 17 and the third gear 15, the power rake gearbox 100 switches to the second gear.

[0029] Specifically, the shift fork groove on the inner lever 2 is clearance-fitted with the sliding gear 16. When the inner lever 2 does not need to push the sliding gear 16, the shift fork groove does not contact the sliding gear 16 to avoid affecting the rotation of the sliding gear 16. The input shaft 18 and the sliding gear 16 are connected by a spline structure to ensure that the sliding gear 16 can move on the input shaft 18 and can transmit torque.

[0030] Furthermore, both ends of the sliding gear 16 are formed with shift grooves, and the end face of the gear gear facing the sliding gear 16 is formed with a shift boss, which is used to engage with the shift groove. Torque transmission is achieved through the rigid meshing of the shift boss and the shift groove. Since the width of the convex and concave step mating surface is large, the shift boss and the shift groove are easier to fit together, and it has the advantages of high strength and low processing cost.

[0031] In some embodiments, the first gear 17 and the third gear 15 are symmetrically arranged at both ends of the input shaft 18, and the first gear limiting hole and the third gear limiting hole are symmetrically arranged on both sides of the limiting pin 12.

[0032] Furthermore, a second gear limiting hole is formed on the gearbox housing 14. The second gear limiting hole, the first gear 17, and the third gear 15 are located on the same arc, and the first gear 17 and the third gear 15 are symmetrically arranged on both sides of the second gear limiting hole. This arc is centered on the axis of the connecting pin 6. Rotating the outer lever 9 around the connecting pin 6 allows it to smoothly pass through the first gear limiting hole, the second gear limiting hole, and the third gear limiting hole, thereby achieving smooth gear shifting.

[0033] In some embodiments, the inner lever 2 includes a fork portion 1, an inner lever body, and a first elastic retaining ring 3. The fork portion 1 has a fork groove, and one end of the fork portion 1 is inserted into the inner lever body. The first elastic retaining ring 3 is sleeved on the fork portion 1 and engages with the inner lever body for positioning. The other end of the inner lever body is sleeved on the connecting pin 6. The first elastic retaining ring 3 enables a detachable connection between the fork portion 1 and the inner lever body, facilitating the replacement of the easily worn fork portion 1.

[0034] In some embodiments, the outer lever 9 includes an outer lever body and a handle portion. The handle portion is disposed at one end of the outer lever body, and the other end of the outer lever body is sleeved on the connecting pin 6 and connected by a second cotter pin 7. The second cotter pin 7 enables the separation of the outer lever body from the connecting pin 6, thereby achieving modularity of the lever assembly and facilitating disassembly, assembly, and maintenance of the lever assembly.

[0035] In some embodiments, the connecting pin 6 is mounted on the gearbox housing 14 via the connecting bushing 4, and a sealing ring 5 is provided between the connecting bushing 4 and the connecting pin 6 to ensure the airtightness of the gearbox housing 14.

[0036] Furthermore, a second elastic retaining ring 8 is provided between the outer lever body and the connecting bushing 4 to prevent the outer lever body from directly contacting the connecting bushing 4 and causing wear.

[0037] A specific embodiment of this application also provides an agricultural machine, including a power harrow gearbox 100. Since the agricultural machine employs all the above-described embodiments of the power harrow gearbox 100, it possesses all the beneficial effects of the power harrow gearbox 100.

[0038] In the description of this application, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0039] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between components; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0040] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0041] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. A power rake gearbox, characterized in that, include: The gearbox housing (14) is provided with a gear position limiting hole (20). There are several gears, each corresponding to a different gear. A sliding gear (16) is used to connect with different gear gears to switch different gears; The lever assembly includes an inner lever (2), a connecting pin (6), and an outer lever (9). The inner lever (2) and the outer lever (9) are both sleeved and fixed on the connecting pin (6) and rotatably connected to the gearbox housing (14) through the connecting pin (6). The inner lever (2) is located inside the gearbox housing (14) and forms a shift fork groove for moving the sliding gear (16). The outer lever (9) is equipped with a limiting pin (12) for inserting and engaging with the gear position limiting hole (20).

2. The power rake gearbox according to claim 1, characterized in that, A through hole is formed on the outer lever (9), and a spring (10) is provided in the through hole. A limiting protrusion is formed on the inner peripheral wall of the through hole. The limiting pin (12) passes through the through hole and forms a limiting slot. The spring (10) is located between the limiting protrusion and the limiting slot.

3. The power rake gearbox according to claim 2, characterized in that, The end of the limiting pin (12) away from the gearbox housing (14) is provided with a pressure plate (13), and the pressure plate (13) is in a limiting engagement with the outer lever (9).

4. The power rake gearbox according to claim 3, characterized in that, The pressure plate (13) is sleeved on the limiting pin (12), and the pressure plate (13) and the limiting pin (12) are connected by a first cotter pin (11).

5. The power rake gearbox according to claim 1, characterized in that, The number of gears is two, namely a first gear (17) and a third gear (15). The first gear (17) and the third gear (15) are respectively sleeved on both ends of the input shaft (18) through bearings (19). The sliding gear (16) is axially movable on the input shaft (18) and located between the first gear (17) and the third gear (15). The inner lever (2) is used to move the sliding gear (16) along the axial direction. The gearbox housing (14) has a first gear limiting hole and a third gear limiting hole.

6. The power rake gearbox according to claim 5, characterized in that, The first gear (17) and the third gear (15) are symmetrically arranged at both ends of the input shaft (18), and the first gear limiting hole and the third gear limiting hole are symmetrically arranged on both sides of the limiting pin (12).

7. The power rake gearbox according to claim 6, characterized in that, The gearbox housing (14) also has a second gear limiting hole. The second gear limiting hole, the first gear (17) and the third gear (15) are located on the same arc, and the first gear (17) and the third gear (15) are symmetrically arranged on both sides of the second gear limiting hole.

8. The power rake gearbox according to claim 5, characterized in that, Both ends of the sliding gear (16) are provided with shift grooves, and the end face of the gear gear facing the sliding gear (16) is provided with a shift boss, which is used to engage with the shift grooves.

9. The power rake gearbox according to claim 1, characterized in that, The inner lever (2) includes a fork portion (1), an inner lever body, and a first elastic retaining ring (3). The fork portion (1) has a fork groove. The fork portion (1) is inserted into one end of the inner lever body. The first elastic retaining ring (3) is sleeved on the fork portion (1) and is in a limiting fit with the inner lever body. The other end of the inner lever body is sleeved on the connecting pin (6). The outer lever (9) includes an outer lever body and a handle. The handle is located at one end of the outer lever body, and the other end of the outer lever (9) is sleeved on the connecting pin (6) and connected by a second cotter pin (7). The connecting pin (6) is mounted on the gearbox housing (14) via the connecting bushing (4), and a sealing ring (5) is provided between the connecting bushing (4) and the connecting pin (6).

10. An agricultural machine, characterized in that, Includes the power rake gearbox (100) according to any one of claims 1 to 9.

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