Rotary cultivator
By setting up a device on the power output shaft of the rotary tiller that limits the spline connection away from the power output shaft, the pin shearing and component breakage caused by the axial force generated by the rotary tiller is solved, which extends the service life of the power output shaft and the gear box, and ensures continuous operation of the rotary tiller.
Patent Information
- Application Number
- CN202421618343.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-10
- Publication Date
- 2025-06-20
- Estimated Expiration
- 2034-07-10
AI Technical Summary
When existing rotary tillers are carried by tractors, especially on curved ridges in farmlands or when encountering stones, the axial force generated by the rotary tillers will cut the pin shaft shorten, causing the rotary tillers to produce additional axial force on the bearings and shorten the service life of the bearings. At the same time, the spline joints and pin holes on the power output shaft will cause stress concentration, causing these components to break, and thus stop rotary tillers.
The built-in shaft end fixing method is adopted, and a device that limits the spline junction away from the power output shaft is provided at the outer spline circumference or end of the power output shaft, such as using spring grooves, threads and locking mothers, bosses and sleeves, to replace the traditional pin fixing method that passes through the shaft.
Effectively prevent the power output shaft from breaking from the pin hole, extending the life of the power output shaft and gear box, and avoiding the fracture of the spline plate and power output shaft, ensuring continuous operation of the rotary tiller.
Smart Images
Figure CN222996990U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a rotary tiller. Background Art
[0002] Figure 1 is the front view of the existing rotary tiller 1, Figure 2 is the view of the gearbox 1-1 configured in the existing rotary tiller 1, Figure 3 is the view of the power output shaft 1-1-1 of the existing gearbox 1-1. A pin hole 1-1-1-1 is penetrated through the power output shaft 1-1-1. Figure 4 is the view of the spline adapter plate 1-2 of the existing rotary tiller 1, which is composed of Figure 4 It can be seen that a pin hole 1-1-1-1 is penetrated through the spline adapter plate 1-2. Figure 5 is Figure 1 the partial enlarged view in Figure 5 As can be seen in
[0003] For the existing rotary tiller 1, the axial positioning of the spline adapter plate 1-2 and the rotary tiller shaft 1-3 is achieved by simultaneously passing a pin shaft 1-4 through the pin holes 1-1-1-1 on the spline adapter plate 1-2 and the pin holes 1-1-1-1 on the power output shaft 1-1-1 and locking with a split pin 1-5, so as to axially position the existing rotary tiller shaft 1-3 and prevent the rotary tiller shaft 1-3 from axially moving outward to apply an additional axial force to the bearing 1-6 and shorten the service life of the bearing 1-6. Summary of the Utility Model
[0004] In view of the above problems, the present utility model provides a rotary tiller, which can effectively solve the problems that when a tractor carries a rotary tiller to operate on a curved ridge in a farmland and encounters stones, the axial force generated by the rotary tiller shaft shears the pin shaft, causing an axial load on the bearing at the end of the rotary tiller shaft, shortening the service life of the bearing at the end of the rotary tiller shaft, and due to the presence of pin holes on the spline adapter plate and the power output shaft, weakening the strength of the spline adapter plate and the power output shaft, resulting in the fracture of the spline adapter plate at the pin hole and the fracture of the power output shaft at the pin hole, making it impossible to continue the rotary tillage operation.
[0005] To achieve the above object, the rotary tiller of the present utility model includes a gearbox. The gearbox extends out a power output shaft. The free end of the power output shaft is provided with an external spline. A spline adapter plate is sleeved on the external spline portion of the power output shaft. A device for restricting the spline adapter plate from moving away from the power output shaft is provided on the circumferential direction of the external spline of the power output shaft or at the end of the power output shaft. The spline adapter plate is connected to the rotary tiller shaft adapter plate.
[0006] To achieve the above object, the rotary tiller of the present utility model includes a gearbox. The gearbox extends out a power output shaft. The free end of the power output shaft is provided with an external spline. A spline adapter plate is sleeved on the external spline portion of the power output shaft. A boss is provided at the end of the power output shaft. A device for restricting the spline adapter plate from moving away from the power output shaft is provided on the circumferential direction of the boss or at the end of the boss. The spline adapter plate is connected to the rotary tiller shaft adapter plate.
[0007] In the present utility model, the fixing method at the shaft end is changed from the previous pin shaft fixing method passing through the shaft to an internal shaft end fixing method, which can greatly prevent the power output shaft from breaking at the pin hole, thereby prolonging the service life of the power output shaft and the gearbox.
[0008] Among them, for the above-mentioned device for restricting the spline adapter plate from moving away from the power output shaft provided on the circumferential direction of the external spline of the power output shaft or at the end of the power output shaft, its specific structure is: a snap ring groove can be provided on the circumferential direction of the external spline of the power output shaft, and a snap ring is provided in the snap ring groove to block the spline adapter plate to restrict the spline adapter plate from moving away from the power output shaft.
[0009] Among them, for the above-mentioned device for restricting the spline adapter plate from moving away from the power output shaft provided on the circumferential direction of the external spline of the power output shaft or at the end of the power output shaft, its specific structure is: a thread can be provided on the circumferential direction of the external spline of the power output shaft, and a lock nut is provided to block the spline adapter plate to restrict the spline adapter plate from moving away from the power output shaft.
[0010] Among them, for the above-mentioned device that restricts the spline adapter plate from moving away from the power output shaft, which is arranged circumferentially on the external spline of the power output shaft or at the end of the power output shaft, its specific structure is as follows: Threaded holes are provided at the end of the power output shaft, and a retaining pad is fixed to the end of the power output shaft with bolts, and the spline adapter plate is blocked by the retaining pad to restrict the spline adapter plate from moving away from the power output shaft.
[0011] Among them, for the above-mentioned device that restricts the spline adapter plate from moving away from the power output shaft, which is arranged circumferentially on the external spline of the power output shaft or at the end of the power output shaft, its specific structure is as follows: Threaded holes are provided at the end of the power output shaft, and then the spline adapter plate is blocked by flange bolts to restrict the spline adapter plate from moving away from the power output shaft.
[0012] Furthermore
[0013] A boss is provided at the end of the power output shaft, and a device that restricts the spline adapter plate from moving away from the power output shaft is arranged circumferentially on the boss or at the end of the boss.
[0014] Its specific structure is as follows: A snap ring groove is provided circumferentially on the boss, a snap ring is arranged in the snap ring groove, and a sleeve is sleeved on the boss, and the spline adapter plate is blocked by the sleeve to restrict the spline adapter plate from moving away from the power output shaft.
[0015] Its specific structure can also be as follows: Threads are provided circumferentially on the boss, and a lock nut is provided. A sleeve is sleeved on the boss, and the spline adapter plate is blocked by the sleeve to restrict the spline adapter plate from moving away from the power output shaft.
[0016] Its specific structure can also be as follows: A screw hole is provided at the end of the boss, a sleeve is sleeved on the boss, the sleeve is blocked by a retaining pad, the retaining pad is fixed with bolts, and the spline adapter plate is blocked by the sleeve to restrict the spline adapter plate from moving away from the power output shaft.
[0017] Its specific structure can also be as follows: A screw hole is provided at the end of the boss, a sleeve is sleeved on the boss, the sleeve is blocked by flange bolts, and the spline adapter plate is blocked by the sleeve to restrict the spline adapter plate from moving away from the power output shaft. Description of the Drawings
[0018] Figure 1 is the front view of a rotary tiller of the prior art. In Figure 1As can be seen, the positioning method of the power output shaft 1-1-1 of the gearbox 1-1 and the spline adapter plate 1-2 is as follows: A pin shaft 1-4 passes through the pin holes of the spline adapter plate 1-2 and the power output shaft 1-1-1, and is locked with a split pin 1-5. The spline adapter plate 1-2 is connected to the rotary tillage shaft adapter plate of the rotary tillage shaft 1-3, and a bearing 1-6 is provided at the other end of the rotary tillage shaft. Moreover, the lowest speed of the rotary tillage shaft is 220 revolutions per minute. When the split pin 1-5 locking the pin shaft 1-4 encounters a stone or a hard object, the split pin 1-5 will fall off and the pin shaft 1-4 will bend. If the split pin 1-5 falls off, the pin shaft 1-4 will be lost. If the pin shaft 1-4 bends, it will cause difficulties in replacing the pin shaft.
[0019] Figure 2 is Figure 1 the view of the gearbox 1-1 in
[0020] Figure 3 the view of the power output shaft of the gearbox of the existing rotary tiller. As can be seen in Figure 3 the power output shaft 1-1-1 of the existing gearbox is provided with a pin hole 1-1-1-1. This pin hole is a through hole. The existence of this pin hole is because the material of the power output shaft has been removed, so the strength of the power output shaft is weakened.
[0021] Figure 4 the view of the existing spline adapter plate. The spline adapter plate 1-2 is provided with a pin hole 1-1-1-1. This pin hole also weakens the strength of the spline adapter plate.
[0022] Figure 5 is Figure 1 the partial enlarged view in
[0023] Figure 6 the view of Embodiment 1
[0024] Figure 7 is Figure 6 the view of the power output shaft 2 in
[0025] Figure 8 is Figure 6 the view of the snap ring 3 configured in
[0026] Figure 9 the view of Embodiment 2
[0027] Figure 10 is Figure 9 the view of the power output shaft 4 in
[0028] Figure 11 is Figure 9 the view of the lock nut 5 in
[0029] Figure 12 It is a view of Embodiment 3.
[0030] Figure 13 is Figure 12 a view of the power output shaft 6 in Figure 13 wherein, the power output shaft 6 is provided with a screw hole 6-1 at the end face.
[0031] Figure 14 It is a view of Embodiment 4.
[0032] Figure 15 It is a view of Embodiment 5.
[0033] Figure 16 is Figure 15 a view of the power output shaft 9 in
[0034] Figure 17 wherein, the end of the power output shaft 9 is provided with a boss 9-1, and a snap ring groove 2-1 is arranged in the circumferential direction of the boss 9-1.
[0035] Figure 18 is Figure 17 a view of the power output shaft 11 in
[0036] Figure 19 It is a view of Embodiment 7.
[0037] Figure 20 is Figure 19 a view of the power output shaft 12 in
[0038] Figure 21 wherein, the end of the power output shaft 12 is provided with a boss 9-1.
[0039] Figure 22 It is a view of Embodiment 9. Detailed implementation manners
[0040] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings of the specification.
[0041] Embodiment 1
[0042] As Figure 6 , Figure 7 , Figure 8As shown in the figure, a rotary tiller includes a gearbox 1-1. A power output shaft 2 extends from the gearbox 1-1. The free end of the power output shaft 2 is provided with external splines. A spline adapter plate 1-2 is sleeved on the external spline part of the power output shaft 2. A device for restricting the spline adapter plate 1-2 from moving away from the power output shaft 2 is provided circumferentially on the external splines of the power output shaft 2 or at the end of the power output shaft 2. The spline adapter plate 1-2 is connected to a rotary tiller shaft adapter plate 1-3-1.
[0043] In the above, the device for restricting the spline adapter plate from moving away from the power output shaft provided circumferentially on the external splines of the power output shaft or at the end of the power output shaft can be various structures capable of restricting the spline adapter plate from moving away from the power output shaft.
[0044] Such as Figure 6 、 Figure 7 、 Figure 8 As shown in the figure, a rotary tiller includes a gearbox 1-1. A power output shaft 2 extends from the gearbox 1-1. The free end of the power output shaft 2 is provided with external splines. A snap ring groove 2-1 is provided circumferentially on the external splines of the power output shaft 2. A snap ring 3 is arranged in the snap ring groove 2-1. The spline adapter plate 1-2 is connected to a rotary tiller shaft adapter plate 1-3-1.
[0045] Embodiment 2
[0046] Certainly, as an improvement of the above, according to the situation of the rotary tiller body, the snap ring groove provided circumferentially on the external splines of the power output shaft can be changed to a thread, and a lock nut is used, which can also play a role in restricting the spline adapter plate from moving away from the power output shaft.
[0047] Such as Figure 9 、 Figure 10 And Figure 11 As shown in the figure, a rotary tiller includes a gearbox 1-1. A power output shaft 4 extends from the gearbox 1-1. The free end of the power output shaft 4 is provided with external splines. A spline adapter plate 1-2 is sleeved on the external spline part of the power output shaft. A thread 4-1 is provided circumferentially on the external splines of the power output shaft, and a lock nut 5 is provided. The spline adapter plate 1-2 is connected to a rotary tiller shaft adapter plate 1-3-1.
[0048] When the tractor is carrying the rotary tiller to operate on a curved ridge or encounters a stone, an axial force is generated on the rotary tiller shaft 1-3. At this time, the lock nut 5 restricts the spline adapter plate from moving away from the power output shaft 4, and no axial load will be generated on the bearing 1-6 at the end of the rotary tiller shaft. There are no pin holes on the spline adapter plate 1-2 and the power output shaft 4, so neither the spline adapter plate 1-2 nor the power output shaft will break, extending the service life of the rotary tiller.
[0049] As described above, a device for restricting the spline adapter plate from moving away from the power output shaft can be provided on the circumferential direction of the external spline of the power output shaft or at the end of the power output shaft, and can be various structures capable of restricting the spline adapter plate from moving away from the power output shaft.
[0050] For example, a circle adapted to the outer diameter of the external spline is provided on the circumferential direction of the external spline of the power output shaft, and the circle is glued to the external spline of the power output shaft, or the circle and the external spline of the power output shaft are in interference fit, which can play a role in restricting the spline adapter plate from moving away from the power output shaft (not shown in the figure).
[0051] Certainly, as an improvement of the above, a device for restricting the spline adapter plate from moving away from the power output shaft can also be provided at the end of the power output shaft.
[0052] Embodiment 3
[0053] As Figure 12 and Figure 13 shown, a rotary tiller includes a gearbox 1-1, a power output shaft 6 extends from the gearbox 1-1, an external spline is provided at the free end of the power output shaft 6, a spline adapter plate 1-2 is sleeved on the external spline portion of the power output shaft 6, a screw hole 6-1 is provided at the end of the power output shaft 6, and bolts 7 and washers 8 are used to restrict the spline adapter plate 1-2 from moving away from the power output shaft 6, and the spline adapter plate 1-2 is connected to a rotary tiller shaft adapter plate 1-3-1.
[0054] Certainly, the power output shaft 6 may not be provided with a threaded hole 6-1, but a hole is provided in the center of the washer 8, and the washer 8 is plug welded to the end of the power output shaft 6, which can also play a role in restricting the spline adapter plate 1-2 from moving away from the power output shaft 6 (not shown in the figure).
[0055] As described above, a device for restricting the spline adapter plate from moving away from the power output shaft can be provided on the circumferential direction of the external spline of the power output shaft or at the end of the power output shaft, and can be various structures capable of restricting the spline adapter plate from moving away from the power output shaft.
[0056] Embodiment 4
[0057] As Figure 13 and Figure 14 shown, a rotary tiller includes a gearbox 1-1, the gearbox 1-1 extends a power output shaft 6, a spline adapter plate 1-2 is sleeved on the external spline portion of the power output shaft 6, and flange bolts 9 are used at the end of the power output shaft 6 to restrict the spline adapter plate 1-2 from moving away from the power output shaft 6, and the spline adapter plate 1-2 is connected to a rotary tiller shaft adapter plate 1-3-1.
[0058] The above-mentioned multiple embodiments have elaborated in detail "a device for restricting the spline adapter plate from moving away from the power output shaft at the circumferential direction of the external spline of the power output shaft or at the end of the power output shaft". The setting of this device cancels the pin holes on the power output shaft and the pin holes of the spline adapter plate in the prior art, improves the strength of the power output shaft and the spline adapter plate, and enables the axial force generated by the rotary tillage shaft not to impose additional loads on the bearings at the end of the rotary tillage shaft.
[0059] The innovation of this utility model is only one, but the structures for realizing this innovation are (1 + N). Due to space limitations, the pen cannot go further.
[0060] Embodiment 5
[0061] As Figure 15 and Figure 16 shown, a rotary tiller includes a gearbox 1-1. The gearbox extends a power output shaft 9. An external spline is provided at the free end of the power output shaft 9. A spline adapter plate 1-2 is sleeved on the external spline portion of the power output shaft 9. A boss 9-1 is provided at the end of the power output shaft 9. A device for restricting the spline adapter plate 1-2 from moving away from the power output shaft 9 is provided at the circumferential direction or the end of the boss 9-1. The spline adapter plate 1-2 is connected to the rotary tillage shaft adapter plate 1-3-1.
[0062] Among them, "a sleeve 10 is provided at the circumferential direction of the boss 9-1, a snap ring 3 is provided in the snap ring groove 2-1, the sleeve 10 blocks the spline adapter plate 1-2, and the snap ring blocks the sleeve 10, thus restricting the spline adapter plate 1-2 from moving away from the power output shaft 9.
[0063] In the above, a boss is provided at the end of the power output shaft, and a device for restricting the spline adapter plate from moving away from the power output shaft is provided at the circumferential direction or the end of the boss, which should be various structures capable of restricting the spline adapter plate from moving away from the power output shaft.
[0064] Embodiment 6
[0065] As Figure 11 、 Figure 17 and Figure 18 shown, a rotary tiller includes a gearbox 1-1. The gearbox 1-1 extends a power output shaft 11. An external spline is provided at the free end of the power output shaft. A spline adapter plate 1-2 is sleeved on the external spline portion of the power output shaft 11. A boss 9-1 is provided at the end of the power output shaft 11. A device for restricting the spline adapter plate 1-2 from moving away from the power output shaft 11 is provided at the circumferential direction or the end of the boss 9-1. The spline adapter plate 1-2 is connected to the rotary tillage shaft adapter plate 1-3-1.
[0066] Among them, a sleeve 10 is sleeved on the boss 9-1, a thread 4-1 is arranged in the circumferential direction of the boss 9-1, and a lock nut 5 is arranged to block the sleeve 10 to limit the splined flange 1-2 from moving away from the power output shaft 11. The splined flange 1-2 is connected to the rotary tiller shaft flange 1-3-1.
[0067] In the above, a boss is arranged at the end of the power output shaft, and a device for restricting the splined flange from moving away from the power output shaft is arranged in the circumferential direction or at the end of the boss, and it should be various structures that can restrict the splined flange from moving away from the power output shaft.
[0068] For example, a circle adapted to the outer diameter of the boss is arranged in the circumferential direction of the boss arranged at the end of the power output shaft, and the circle is glued to the outer surface of the boss. Of course, there are other methods, such as setting the circle and the outer surface of the boss to be in an interference fit, etc., which can all play a role in restricting the splined flange from moving away from the power output shaft (not shown in the figure).
[0069] Of course, as an improvement of the above, a device for restricting the splined flange from moving away from the power output shaft can also be arranged at the end of the boss arranged at the end of the power output shaft.
[0070] Embodiment 7
[0071] As Figure 19 and Figure 20 shown, a rotary tiller includes a gearbox 1-1. The gearbox 1-1 extends a power output shaft 12. The free end of the power output shaft 12 is provided with an external spline. A splined flange 1-2 is sleeved on the external spline part of the power output shaft 12. A boss 9-1 is arranged at the end of the power output shaft 12. A device for restricting the splined flange 1-2 from moving away from the power output shaft 12 is arranged in the circumferential direction or at the end of the boss 9-1. The splined flange 1-2 is connected to the rotary tiller shaft flange 1-3-1.
[0072] Of course, the power output shaft 12 may not be provided with a threaded hole 6-1, but a hole is arranged in the center of the gasket 8, and the gasket 8 is plug welded to the end of the boss, which can also play a role in restricting the splined flange 1-2 from moving away from the power output shaft 12 (not shown in the figure).
[0073] Embodiment 8
[0074] As shown in Figure 20 , Figure 21As shown in the figure, a rotary tiller includes a gearbox 1-1. A power output shaft 12 extends from the gearbox. The free end of the power output shaft 12 is provided with an external spline. A spline adapter plate 1-2 is sleeved on the external spline portion of the power output shaft 12. A boss 9-1 is provided at the end of the power output shaft 12. A device for restricting the spline adapter plate 1-2 from moving away from the power output shaft 12 is provided in the circumferential direction or at the end of the boss 9-1. The spline adapter plate 1-2 is connected to a rotary tiller shaft adapter plate 1-3-1.
[0075] In this embodiment, a basin-shaped sleeve 13 is sleeved on the boss 9-1 provided on the end face of the power output shaft 12, and the basin-shaped sleeve 13 is fixedly installed at the end of the boss 9-1 with bolts 7.
[0076] Embodiment 9
[0077] As Figure 20 、 Figure 22 As shown in the figure, a rotary tiller includes a gearbox 1-1. A power output shaft 12 extends from the gearbox 1-1. The free end of the power output shaft is provided with an external spline. A spline adapter plate 1-2 is sleeved on the external spline portion of the power output shaft. A boss 9-1 is provided at the end of the power output shaft 12. A device for restricting the spline adapter plate 1-2 from moving away from the power output shaft is provided in the circumferential direction or at the end of the boss 9-1. The spline adapter plate 1-2 is connected to a rotary tiller shaft adapter plate 1-3-1.
[0078] In this embodiment, a sleeve 10 is sleeved on the boss 9-1 provided on the end face of the power output shaft 12. Then, flange bolts 9 are used to block the sleeve 10 to restrict the spline adapter plate 1-2 from moving away from the power output shaft 12.
[0079] Of course, a smooth hole can also be drilled along the axis of the power output shaft and it is a through hole. In this way, a retaining pad 8 can be fixedly installed with rivets to block the sleeve 10, and the sleeve 10 is used to block the spline adapter plate 1-2, which can also restrict the spline adapter plate 1-2 from moving away from the power output shaft 12 (not shown in the figure due to space limitations).
[0080] In summary, the above-mentioned "a boss is provided at the end of the power output shaft, and a device for restricting the spline adapter plate from moving away from the power output shaft is provided in the circumferential direction or at the end of the boss" should be various structures capable of restricting the spline adapter plate from moving away from the power output shaft.
Claims
1. A rotary tiller, comprising a gearbox, wherein a power output shaft extends from the gearbox, an external spline is provided at the free end of the power output shaft, and a spline receiving plate is sleeved on the external spline portion of the power output shaft, characterized in that: A device for limiting the spline connection plate from being away from the power output shaft is arranged on the outer spline circumference of the power output shaft or the end of the power output shaft, and the spline connection plate is connected to the rotary tiller shaft connection plate.
2. A rotary tiller, comprising a gear box, wherein a power shaft extends from the gear box, an external spline is provided at the free end of the power output shaft, and a spline receiving plate is sleeved on the external spline portion of the power output shaft, characterized in that: A boss is arranged at the end of the power output shaft, and a device for limiting the spline connection plate from being away from the power output shaft is arranged on the outer surface of the boss or the end of the boss, and the spline connection plate is connected to the rotary tiller shaft connection plate.