Hinge structure of riding type four-wheel-drive mini-tiller

Abstract

The utility model provides a hinge structure of a riding type four-wheel-drive mini-tiller. The hinge structure solves the problems that an existing hinge structure of the riding type four-wheel-drive mini-tiller is inflexible in rotation and prone to being stuck. The hinge structure of the riding type four-wheel-drive mini-tiller comprises a first hinge frame and a second hinge frame, a first rotating shaft extending vertically is rotatably arranged in the first hinge frame in a penetrating mode, and a first bearing, a second bearing and a protection assembly used for protecting the first bearing and the second bearing are arranged between the first rotating shaft and the first hinge frame. The second hinge frame is fixedly connected to the first rotating shaft and located between the first bearing and the second bearing. Due to the fact that the first bearing and the second bearing are arranged between the first rotating shaft and the first hinge frame, abrasion of the first hinge frame and the second hinge frame can be reduced, meanwhile, the protection assembly is arranged, large-particle soil, gravel and the like can be effectively prevented from entering, and the bearings are prevented from being stuck.

Description

Technical Field

[0001] This utility model belongs to the field of micro-tiller technology and relates to a hinge structure for a ride-on four-wheel drive micro-tiller. Background Technology

[0002] Mini tillers are characterized by their light weight, small size, and simple structure, making them widely applicable to dry land, paddy fields, and orchards in plains, mountains, and hills. The main users of mini tillers are farmers, and they are frequently used in mountainous and hilly areas. Therefore, a balance between low price, light weight, and small size is essential, leading to the predominance of walk-behind mini tillers. However, this type of mini tiller requires a higher level of skill from the operator and is relatively more difficult to operate. During tilling, the operator must maintain a steady grip on the handle and apply downward force. Turning also requires operation via the handle, resulting in a very high level of physical exertion for the operator.

[0003] To this end, a Chinese patent discloses a four-wheeled micro-tillage device [authorization announcement number CN218868634U], which has a hinged connection part. The hinged connection part includes a steering structure component and a protective body, both of which are covered outside the drive shaft. The steering structure component includes two mounting plates and two connecting plates. The two mounting plates are respectively bolted to both sides of the housing of the front gearbox. The two connecting plates are connected between the two mounting plates. The upper and lower side walls of the protective body are respectively hinged to the two connecting plates. The protective body can rotate in the horizontal direction relative to the connecting plates.

[0004] To achieve the hinge, a pivot is inserted between the protective body and the two connecting plates, allowing the protective body to rotate horizontally around the pivot. During rotation, significant wear occurs between the protective body, connecting plates, and pivot, resulting in a short service life. To reduce wear, bearings are typically added between the protective body and the pivot, and between the connecting plates and the pivot. However, during tilling operations, large amounts of soil and gravel can enter the bearings, easily causing them to seize or fail. Utility Model Content

[0005] The purpose of this invention is to address the aforementioned problems in existing technologies by proposing a hinge structure for a ride-on four-wheel drive micro-tiller that is flexible in rotation and less prone to jamming.

[0006] The objective of this utility model can be achieved through the following technical solutions:

[0007] The hinge structure of the ride-on four-wheel drive mini tiller includes a first hinge frame and a second hinge frame. A first vertically extending first rotating shaft is rotatably inserted inside the first hinge frame. A first bearing, a second bearing, and a protective component for protecting the first bearing and the second bearing are provided between the first rotating shaft and the first hinge frame. The second hinge frame is fixedly connected to the first rotating shaft and located between the first bearing and the second bearing.

[0008] Because a first bearing and a second bearing are provided between the first rotating shaft and the first hinge frame, the wear of the first hinge frame and the second hinge frame can be reduced. At the same time, a protective component is provided to effectively prevent large particles such as mud and gravel from entering and to prevent the bearing from seizing.

[0009] In the hinge structure of the above-mentioned four-wheel drive mini-tiller, the protective component includes a first protective sleeve fixed to the first hinge frame and sleeved outside the first rotating shaft, a second protective sleeve located below the first protective sleeve, a first protective cover with clearance fit inside the first protective sleeve, and a second protective cover with clearance fit inside the second protective sleeve. The lower end of the first protective sleeve is provided with a first limiting edge, and the first bearing is limited between the first protective cover and the first limiting edge. The upper end of the second protective cover is provided with a second limiting edge, and the second bearing is limited between the second protective cover and the second limiting edge.

[0010] The upper end of the first bearing is protected by a first protective cover, and the lower end of the second bearing is protected by a second protective cover, which prevents larger particles from entering. Water entering from the upper end of the first protective cover can flow out from the lower end of the first protective cover, and water entering from the upper end of the second protective cover can flow out from the lower end of the second protective cover.

[0011] In the hinge structure of the above-mentioned four-wheel drive mini-tiller, the second hinge frame has a first blocking plate located below the first protective cover and a second blocking plate covering the second protective cover. The first blocking plate and the first protective cover are in clearance fit, and the second blocking plate and the second protective cover are in clearance fit.

[0012] The first protective cover protects the upper end of the first protective sleeve, the first baffle plate protects the lower end of the first protective sleeve, the second protective cover protects the lower end of the second protective sleeve, and the second baffle plate protects the upper end of the second protective sleeve, thus preventing large particles of mud and rocks from entering.

[0013] In the hinge structure of the above-mentioned four-wheel drive mini-tiller, the first protective cover and the second protective cover are respectively sleeved on the first rotating shaft. One end of the first rotating shaft has a first limiting step, and the other end is threaded with a first locking nut. Under the action of the first locking nut and the first limiting step, the lower end of the first protective cover abuts against the inner ring of the first bearing, and the upper end of the second protective cover abuts against the inner ring of the second bearing.

[0014] During installation, the first shaft is passed through the second bearing and the first bearing from bottom to top, and then the first locking nut is tightened. The compression of the first locking nut causes the first protective cover to press on the inner ring of the first bearing, and at the same time, the second protective cover presses on the inner ring of the second bearing, thus achieving axial positioning of the first shaft.

[0015] In the hinge structure of the above-mentioned four-wheel drive mini-tiller, the lower end of the first protective cover has a first protrusion abutting against the inner ring of the first bearing, and the upper end of the second protective cover has a second protrusion abutting against the inner ring of the second bearing.

[0016] In the hinge structure of the above-mentioned four-wheel drive mini-tiller, the first protective sleeve is provided with a first annular groove, and the first annular groove is provided with a first elastic retaining ring. The first elastic retaining ring and the first limiting stop edge axially limit the outer ring of the first bearing; the second protective sleeve is provided with a second annular groove, and the second annular groove is provided with a second elastic retaining ring. The second elastic retaining ring and the second limiting stop edge axially limit the outer ring of the second bearing.

[0017] In the hinge structure of the aforementioned four-wheel drive mini-tiller, the second bearing is a self-aligning bearing. Self-aligning bearings can reduce errors during installation and manufacturing.

[0018] In the hinge structure of the aforementioned four-wheel drive mini-tiller, a first connecting frame is fixed above the first hinge frame, and a second connecting frame is fixed above the second hinge frame. A second rotating shaft, coaxial with the first rotating shaft, is mounted on the first connecting frame, and the second connecting frame rotatably engages with the second rotating shaft. The stability of the hinge structure is improved through the first and second connecting frames.

[0019] In the hinge structure of the aforementioned four-wheel drive mini-tiller, a third bearing is provided between the second connecting frame and the second rotating shaft, and a thrust ball bearing is provided between the second connecting frame and the first connecting frame. The thrust bearing is sleeved on the second rotating shaft. The third bearing ensures that the second connecting frame can rotate flexibly around the second rotating shaft, and the thrust ball bearing supports the second connecting frame, preventing wear between the first and second connecting frames.

[0020] In the hinge structure of the above-mentioned four-wheel drive mini-tiller, the second connecting frame is provided with a connecting sleeve, the lower end of the connecting sleeve is provided with a third limiting stop, the upper end of the rotating shaft is provided with a second limiting step, the lower end of which is threaded with a second locking nut, the third bearing is limited between the third limiting stop and the second limiting step, and the thrust ball bearing is limited between the third bearing and the first connecting frame.

[0021] A connecting hole is provided on the first connecting frame. The second rotating shaft passes through the connecting sleeve and the first connecting frame from top to bottom and is then locked by the second locking nut. The outer ring of the third bearing presses on the third limiting stop edge, the second limiting step presses on the inner ring of the third bearing, the inner ring of the third bearing presses on the thrust ball bearing, and the thrust ball bearing is pressed on the first connecting frame.

[0022] In the hinge structure of the above-mentioned four-wheel drive mini-tiller, the connecting sleeve is provided with a third annular groove, the third annular groove is provided with a third elastic retaining ring, and the third elastic retaining ring and the third limiting stop edge axially limit the outer ring of the third bearing.

[0023] Compared with existing technologies, the hinge structure of this riding-type four-wheel drive mini-tiller has the following advantages: Because a first bearing and a second bearing are provided between the first pivot and the first hinge frame, wear between the first and second hinge frames can be reduced. At the same time, protective components are provided to effectively prevent large particles of mud and gravel from entering, thus preventing bearing jamming. A first connecting frame is provided above the first hinge frame, and a second connecting frame is provided above the second hinge frame, improving structural strength. The overall structure is reasonably designed, easy to assemble, and has good stability and strong load-bearing capacity after assembly, which is beneficial for the installation of the mini-tiller seat. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the hinge structure provided by this utility model.

[0025] Figure 2 This is a cross-sectional view of the hinge structure provided by this utility model.

[0026] Figure 3 yes Figure 2 An enlarged schematic diagram of the first rotating shaft.

[0027] Figure 4 yes Figure 2 An enlarged schematic diagram of the second pivot point.

[0028] In the diagram, 1. First hinge frame; 2. Second hinge frame; 3. First pivot; 4. First bearing; 5. Second bearing; 6. First protective sleeve; 7. Second protective sleeve; 8. First protective cover; 9. Second protective cover; 10. First limiting stop; 11. Second limiting stop; 12. First blocking plate; 13. Second blocking plate; 14. First limiting step; 15. First locking nut; 16. First protrusion; 17. Second protrusion; 18. First elastic retaining ring; 19. Second elastic retaining ring; 20. First connecting frame; 21. Second connecting frame; 22. Second pivot; 23. Third bearing; 24. Thrust ball bearing; 25. Connecting sleeve; 26. Third limiting stop; 27. Second limiting step; 28. Second locking nut; 29. ​​Third elastic retaining ring. Detailed Implementation

[0029] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0030] like Figure 1The hinge structure of the ride-on four-wheel drive mini-tiller shown includes a first articulation frame 1 and a second articulation frame 2. In this embodiment, the first articulation frame 1 is the frame of the mini-tiller, the front box of the mini-tiller is located on the first articulation frame 1, and the second articulation frame 2 is the rear box of the mini-tiller.

[0031] like Figure 1 As shown, a vertically extending first rotating shaft 3 rotatably passes through the first hinge frame 1. A first bearing 4, a second bearing 5, and a protective assembly for protecting the first bearing 4 and the second bearing 5 are provided between the first rotating shaft 3 and the first hinge frame 1. The second hinge frame 2 is fixedly connected to the first rotating shaft 3 and located between the first bearing 4 and the second bearing 5. The first bearing 4 is a deep groove ball bearing, and the second bearing 5 is a self-aligning bearing.

[0032] like Figure 3 As shown, the protective assembly includes a first protective sleeve 6 fixed to the first hinge frame 1 and sleeved outside the first rotating shaft 3, a second protective sleeve 7 located below the first protective sleeve 6, a first protective cover 8 with clearance fit inside the first protective sleeve 6, and a second protective cover 9 with clearance fit inside the second protective sleeve 7. The lower end of the first protective sleeve 6 has a first limiting flange 10, which limits the first bearing 4 between the first protective cover 8 and the first limiting flange 10. The upper end of the second protective cover 9 has a second limiting flange 11, which limits the second bearing 5 between the second protective cover 9 and the second limiting flange 11. The upper end of the first bearing 4 is protected by the first protective cover 8, and the lower end of the second bearing 5 is protected by the second protective cover 9, preventing larger particles from entering. Water entering from the upper end of the first protective sleeve 6 can flow out from the lower end of the first protective sleeve 6, and water entering from the upper end of the second protective sleeve 7 can flow out from the lower end of the second protective sleeve 7.

[0033] like Figure 3 As shown, the second hinge frame 2 has a first blocking plate 12 located below the first protective sleeve 6 and a second blocking plate 13 covering the second protective sleeve 7. The first blocking plate 12 and the first protective sleeve 6 are in clearance fit, and the second blocking plate 13 and the second protective sleeve 7 are in clearance fit. The first hinge frame 1 has a clearance space located between the first protective sleeve 6 and the second protective sleeve 7. The second hinge frame 2 extends into this clearance space, and will not contact the first hinge frame 1 when the second hinge frame 2 is rotated.

[0034] The first protective cover 8 protects the upper end of the first protective sleeve 6, the first baffle plate 12 protects the lower end of the first protective sleeve 6, the second protective cover 9 protects the lower end of the second protective sleeve 7, and the second baffle plate 13 protects the upper end of the second protective sleeve 7, thus preventing large particles of mud and stones from entering.

[0035] like Figure 3As shown, the first protective cover 8 and the second protective cover 9 are respectively sleeved on the first rotating shaft 3. One end of the first rotating shaft 3 has a first limiting step 14, and the other end is threaded with a first locking nut 15. Under the action of the first locking nut 15 and the first limiting step 14, the lower end of the first protective cover 8 abuts against the inner ring of the first bearing 4, and the upper end of the second protective cover 9 abuts against the inner ring of the second bearing 5.

[0036] like Figure 3 As shown, the lower end of the first protective cover 8 has a first protrusion 16 that abuts against the inner ring of the first bearing 4, and the upper end of the second protective cover 9 has a second protrusion 17 that abuts against the inner ring of the second bearing 5. This effectively prevents the first cover from contacting the outer ring of the first bearing 4, and also prevents the second cover from contacting the outer ring of the second bearing 5.

[0037] To provide axial restraint for the outer rings of the first bearing 4 and the second bearing 5, such as Figure 3 As shown, the first protective sleeve 6 has a first annular groove, and the first annular groove has a first elastic retaining ring 18. The first elastic retaining ring 18 and the first limiting stop 10 axially limit the outer ring of the first bearing 4. The second protective sleeve 7 has a second annular groove, and the second annular groove has a second elastic retaining ring 19. The second elastic retaining ring 19 and the second limiting stop 11 axially limit the outer ring of the second bearing 5.

[0038] During installation, first position the first bearing 4 within the first protective sleeve 6 using the first elastic retaining ring 18, and position the second bearing 5 within the second protective sleeve 7 using the second elastic retaining ring 19. Place the first blocking plate 12 and the second blocking plate 13 of the second hinge frame 2 within the clearance space of the first hinge frame 1. Slide the second protective cover 9 onto the first rotating shaft 3. Then, from bottom to top, pass the first rotating shaft 3 sequentially through the second bearing 5, the first blocking plate 12, the second blocking plate 13, and the first bearing 4, and extend it from the upper end of the first bearing 4. Secure the second hinge frame 2 to the first rotating shaft 3. Slide the first protective cover 8 onto the first rotating shaft 3, and then lock it with the first locking nut 15 to complete the installation.

[0039] In order to fix the second hinge frame 2 to the first rotating shaft 3, an installation sleeve is fixed on the second hinge frame 2. The first rotating shaft 3 passes through the installation sleeve and is fixed to the installation groove by means of screw locking / welding.

[0040] like Figure 1 and Figure 2As shown, a first connecting frame 20 is provided above the first articulation frame 1 and is fixed relative to the first articulation frame 1. The first connecting frame 20 is fixed on the front box of the micro-tiller. A second connecting frame 21 is provided above the second articulation frame 2 and is fixed relative to the second articulation frame 2. The second connecting frame 21 is fixed on the rear box of the micro-tiller and is used to install the seat of the micro-tiller. A second rotating shaft 22 is provided on the first connecting frame 20 and is coaxially arranged with the first rotating shaft 3. The second connecting frame 21 and the second rotating shaft 22 rotate in cooperation to provide effective support for the seat of the micro-tiller.

[0041] like Figure 4 As shown, a third bearing 23 is provided between the second connecting frame 21 and the second rotating shaft 22, and a thrust ball bearing 24 is provided between the second connecting frame 21 and the first connecting frame 20. The thrust bearing is sleeved on the second rotating shaft 22. The third bearing 23 ensures that the second connecting frame 21 can rotate flexibly around the second rotating shaft 22, and the thrust ball bearing 24 supports the second connecting frame 21 to prevent wear between the first connecting frame 20 and the second connecting frame 21. The third bearing 23 is a deep groove ball bearing.

[0042] like Figure 4 As shown, the second connecting frame 21 is provided with a connecting sleeve 25, the lower end of the connecting sleeve 25 is provided with a third limiting stop 26, the upper end of the rotating shaft is provided with a second limiting step 27, and the lower end of the shaft is threadedly connected with a second locking nut 28. The third bearing 23 is limited between the third limiting stop 26 and the second limiting step 27, and the thrust ball bearing 24 is limited between the third bearing 23 and the first connecting frame 20.

[0043] A connecting hole is provided on the first connecting frame 20. The second rotating shaft 22 passes through the connecting sleeve 25 and the first connecting frame 20 from top to bottom and is then locked by the second locking nut 28. The outer ring of the third bearing 23 presses on the third limiting stop 26, the second limiting step 27 presses on the inner ring of the third bearing 23, the inner ring of the third bearing 23 presses on the thrust ball bearing 24, and the thrust ball bearing 24 is pressed on the first connecting frame 20.

[0044] To achieve the axial positioning of the third bearing 23, such as Figure 4 As shown, the connecting sleeve 25 is provided with a third annular groove, and the third annular groove is provided with a third elastic retaining ring 29. The third elastic retaining ring 29 and the third limiting stop 26 axially limit the outer ring of the third bearing 23.

[0045] During installation, first align the connecting sleeve 25 on the second connecting bracket 21 with the hole on the first connecting bracket 20. Then, from top to bottom, insert the thrust ball bearing 24, the third bearing 23, and the third elastic retaining ring 29 into the connecting sleeve 25, and secure the third elastic retaining ring 29 into the third annular groove. Next, insert the second rotating shaft 22 from top to bottom, ensuring the lower end of the second rotating shaft 22 protrudes through the hole in the first connecting bracket 20, and lock it in place using the second locking nut 28. Considering that the third bearing 23 and the thrust ball bearing 24 are located at the top of the tiller and will not come into contact with the soil, no protective structure is provided here.

[0046] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

Claims

1. A hinged structure of a ride-on four-wheel-drive mini-tiller, characterized in that, The application relates to a hinge assembly, which comprises a first hinge frame (1) and a second hinge frame (2), a first rotating shaft (3) is arranged to rotate in the first hinge frame (1), a first bearing (4) and a second bearing (5) are arranged between the first rotating shaft (3) and the first hinge frame (1), and a protection assembly is arranged to protect the first bearing (4) and the second bearing (5), the second hinge frame (2) is fixedly connected to the first rotating shaft (3) and located between the first bearing (4) and the second bearing (5).

2. The hinged structure of a ride-on four-wheel drive mini-tiller according to claim 1, wherein The protection assembly comprises a first protection sleeve (6) fixedly connected to the first hinge frame (1) and sleeved on the first rotating shaft (3), a second protection sleeve (7) located below the first protection sleeve (6), a first protection cover (8) gap-fitted in the first protection sleeve (6) and a second protection cover (9) gap-fitted in the second protection sleeve (7), the lower end of the first protection sleeve (6) is provided with a first limiting baffle (10), the first bearing (4) is limited between the first protection cover (8) and the first limiting baffle (10), the upper end of the second protection cover (9) is provided with a second limiting baffle (11), and the second bearing (5) is limited between the second protection cover (9) and the second limiting baffle (11).

3. The hinged structure of a ride-on four-wheel drive mini-tiller according to claim 2, wherein The second hinge frame (2) is provided with a first blocking plate (12) located below the first protection sleeve (6) and a second blocking plate (13) covering the second protection sleeve (7), the first blocking plate (12) is gap-fitted with the first protection sleeve (6), and the second blocking plate (13) is gap-fitted with the second protection sleeve (7).

4. The hinged structure of a ride-on four-wheel drive mini-tiller according to claim 2 or 3, characterized in that, The first protection cover (8) and the second protection cover (9) are respectively sleeved on the first rotating shaft (3), one end of the first rotating shaft (3) is provided with a first limiting step (14), the other end is threadedly connected with a first locking nut (15), and the lower end of the first protection cover (8) is abutted against the inner ring of the first bearing (4) under the action of the first locking nut (15) and the first limiting step (14), and the upper end of the second protection cover (9) is abutted against the inner ring of the second bearing (5).

5. The hinged structure of a ride-on four-wheel drive mini-tiller according to claim 4, wherein The lower end of the first protection cover (8) is provided with a first protrusion (16) abutted against the inner ring of the first bearing (4), and the upper end of the second protection cover (9) is provided with a second protrusion (17) abutted against the inner ring of the second bearing (5).

6. The hinged structure of a ride-on four-wheel drive mini-tiller according to claim 2, wherein The first protection sleeve (6) is provided with a first annular groove, the first annular groove is provided with a first elastic clamping ring (18), the first elastic clamping ring (18) and the first limiting baffle (10) axially limit the outer ring of the first bearing (4), the second protection sleeve (7) is provided with a second annular groove, the second annular groove is provided with a second elastic clamping ring (19), and the second elastic clamping ring (19) and the second limiting baffle (11) axially limit the outer ring of the second bearing (5).

7. The hinged structure of a ride-on four-wheel drive mini-tiller according to claim 1, wherein The second bearing (5) is a self-aligning bearing.

8. The hinged structure of a ride-on four-wheel drive mini-tiller according to claim 1, wherein The upper portion of the first hinged frame (1) is provided with a first connecting frame (20) fixed relative to the first hinged frame (1), the upper portion of the second hinged frame (2) is provided with a second connecting frame (21) fixed relative to the second hinged frame (2), the first connecting frame (20) is provided with a second rotating shaft (22) coaxially arranged with the first rotating shaft (3), and the second connecting frame (21) is rotationally matched with the second rotating shaft (22).

9. The hinged structure of a ride-on four-wheel drive mini-tiller according to claim 8, wherein A third bearing (23) is arranged between the second connecting frame (21) and the second rotating shaft (22), and a thrust ball bearing (24) is arranged between the second connecting frame (21) and the first connecting frame (20), and the thrust ball bearing (24) is sleeved on the second rotating shaft (22).

10. The hinged structure of a ride-on four-wheel drive mini-tiller according to claim 9, wherein A connecting sleeve (25) is arranged on the second connecting frame (21), the lower end of the connecting sleeve (25) is provided with a third limiting stop flange (26), the upper end of the rotating shaft is provided with a second limiting step (27), the lower end of the second limiting step (27) is threadedly connected with a second locking nut (28), the third bearing (23) is limited between the third limiting stop flange (26) and the second limiting step (27), and the thrust ball bearing (24) is limited between the third bearing (23) and the first connecting frame (20).

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