A mower and flattening cutterhead assembly and cutterhead housing

Abstract

The present application relates to a kind of mowing and flattening cutterhead assembly and cutterhead box, it relates to the field of agricultural machinery, mowing and flattening cutterhead assembly includes cutterhead seat, shell and gear shaft, gear shaft passes through shell and middle part is rotatably connected with shell, cutterhead seat is connected with gear shaft and synchronously rotates in one end located outside shell, and safety protection groove is set in the circumferential direction of the side wall of gear shaft middle part.Safety protection groove is set in the circumferential direction of the side wall of gear shaft middle part.Cutterhead box includes mowing and flattening cutterhead assembly.The beneficial effect is: impact load will only cause the fracture of one gear shaft, and the problem of successive gear tooth collision will not appear, user only needs to replace one gear shaft, and no longer needs to replace all gear shafts in cutterhead box, substantially reduces maintenance cost and maintenance time.

Description

Technical Field

[0001] This invention relates to the field of agricultural machinery, specifically to a grass-cutting and flattening cutter head assembly and a cutter head box. Background Technology

[0002] Currently, to ensure a large cutting width, grass cutter heads often use a gear-driven tandem configuration to drive multiple cutter heads. In actual use, one cutter head frequently encounters obstacles such as field ridges or stones, causing a sudden increase in load on that single cutter head and leading to gear wear. Because the gears are in a tandem configuration, if one gear wears out, it can trigger wear on other gears in succession. Once this fault occurs, the user has to replace all gears to restore the cutter head to normal operation, resulting in high repair costs and requiring significant time and effort from the user, severely impacting overall machine efficiency and user experience. Summary of the Invention

[0003] The technical problem to be solved by this invention is how to reduce the maintenance cost and time of the cutter head box.

[0004] The technical solution of the present invention to solve the above-mentioned technical problems is as follows: a grass cutting flattening cutter head assembly, including a cutter head seat, a housing and a gear shaft, the gear shaft passing through the housing and being rotatably connected to the housing in the middle, the cutter head seat being connected to the end of the gear shaft located outside the housing and rotating synchronously, and a safety protection groove being provided on the side wall of the middle part of the gear shaft along its circumference.

[0005] The beneficial effects of this invention are as follows: When the cutter head is subjected to an impact load, the gear shaft breaks off from the annular safety protection groove, causing the cutter head and cutter head seat to stop rotating. However, the end of the gear shaft located inside the housing can still continue normal transmission with other gears in the cutter head box, avoiding gear breakage at the impact load point and preventing cascading gear breakage. In other words, the impact load will only cause the breakage of one gear shaft, preventing the problem of cascading gear breakage. Users only need to replace one gear shaft, eliminating the need to replace all gear shafts in the cutter head box, significantly reducing maintenance costs and time.

[0006] Based on the above technical solution, the present invention can be further improved as follows.

[0007] Furthermore, it also includes a fixing bolt and a locking nut. The gear shaft has a locking through hole that is coaxially opened. The fixing bolt includes a bolt head and a screw that are fixedly connected. The bolt head abuts against the gear shaft. The screw passes through the locking through hole and is threadedly connected to the locking nut.

[0008] The beneficial effect of adopting the above-mentioned further solution is that, after the gear shaft breaks, the cutter head will not fall off due to the fixing bolts, thus avoiding other unnecessary damage.

[0009] Furthermore, a locking groove is provided on one side wall of the fixing bolt along its axial direction, and the locking nut has a bent piece that extends or bends along the axial direction of the locking nut to be inserted into the locking groove.

[0010] The beneficial effect of adopting the above-mentioned further solution is that after the lock nut is tightened, the bending piece is bent into the locking groove to prevent the lock nut from loosening.

[0011] Furthermore, both ends of the locking through hole have countersunk holes, and the bolt head and the locking nut are respectively located in the two countersunk holes.

[0012] The advantage of adopting the above-mentioned further solution is that the bolt head and the lock nut are located in two countersunk holes respectively, saving assembly space.

[0013] Furthermore, it also includes a bearing, the middle part of which is rotatably connected to the housing.

[0014] Furthermore, it also includes a retaining ring. The gear shaft includes a main shaft and a gear. The main shaft has a safety protection groove in the middle. One end of the main shaft is fixedly connected to the gear. One end of the main shaft has a shoulder. The bearing includes an inner ring and an outer ring that can rotate relative to each other. The inner ring is fitted in the middle of the main shaft, and one end of it abuts against the shoulder. The housing has an inner hole. One end of the inner hole has a housing limiting end wall extending radially inward. The outer ring is fitted in the inner hole of the housing, and one end of the outer ring abuts against the housing limiting end wall. The retaining ring is engaged with the inner hole of the housing and abuts against the other end of the outer ring. The other end of the main shaft is connected to the cutter head seat and rotates synchronously.

[0015] The advantages of adopting the above-mentioned further solution are: the inner ring of the bearing is axially positioned by the shaft shoulder and the cutter head seat, and the outer ring is axially positioned by the housing limiting end wall and the retaining ring, which makes installation convenient.

[0016] Furthermore, the cutter head holder is connected to the spindle via a spline, and one end of the cutter head holder abuts against the other end of the inner ring.

[0017] Furthermore, the safety protection groove is located at the junction of the cutter head seat and the bearing.

[0018] The beneficial effect of adopting the above-mentioned further solution is that the rotation of the gear is not affected after the gear shaft breaks from the safety protection groove.

[0019] Furthermore, it also includes an assembly nut, which is threaded to the other end of the spindle and abuts against the other end of the cutter head seat.

[0020] The beneficial effect of adopting the above-mentioned further solution is that the cutter head holder is axially locked to the housing by the assembly nut.

[0021] The present invention also provides a cutter head box, including the aforementioned grass-cutting flattening cutter head assembly. Attached Figure Description

[0022] Figure 1 This is the front view of the cutter head box;

[0023] Figure 2 This is a top view of the cutter head box;

[0024] Figure 3 This is a schematic diagram of the gear transmission inside the cutter head box.

[0025] Figure 4 This is a sectional view of a gear shaft in the prior art;

[0026] Figure 5 This is a cross-sectional view of the grass-cutting flattening cutter head assembly of the present invention;

[0027] Figure 6 for Figure 5 A magnified view of part A of the grass-cutting flattening cutter head assembly;

[0028] Figure 7 for Figure 5 A magnified view of part B of the grass-cutting flattening cutter head assembly.

[0029] The attached diagram lists the components represented by each number as follows:

[0030] 1. Cutter head holder; 2. Housing; 21. Housing limiting end wall; 3. Gear shaft; 31. Shaft shoulder; 32. Gear; 4. Safety protection groove; 5. Fixing bolt; 6. Locking nut; 7. Locking groove; 8. Bending plate; 9. Bearing; 10. Retaining ring; 11. Assembly nut; 12. Stepped structure. Detailed Implementation

[0031] The principles and features of the present invention are described below. The examples given are only for explaining the present invention and are not intended to limit the scope of the present invention.

[0032] like Figures 1-4 As shown, multiple cutter head holders 1 inside the cutter head box rotate under the drive of gear shafts 3, and the multiple gear shafts 3 are sequentially transmitted through pinions. The cutter head holders 1 are fixed on the corresponding gear shafts 3. The gear shafts 3 have no protective structure. When the load on a single cutter head increases, it is easy to cause multiple cutter heads to break teeth.

[0033] like Figures 5-7As shown, this embodiment provides a grass cutting and flattening cutter head assembly, including a cutter head seat 1, a housing 2, and a gear shaft 3. The gear shaft 3 passes through the housing 2 and is rotatably connected to the housing 2 in the middle. The cutter head seat 1 is connected to the end of the gear shaft 3 located outside the housing 2 and rotates synchronously. A safety protection groove 4 is provided on the side wall of the middle part of the gear shaft 3 along its circumference.

[0034] When the cutter head is subjected to an impact load, the gear shaft 3 breaks off from the annular safety protection groove 4, causing the cutter head and cutter head seat 1 to stop rotating. However, the gear 32 can still continue to rotate normally along with the other gears in the cutter head box, avoiding tooth breakage at the impact load point and preventing cascading tooth breakage of other gears. In other words, the impact load will only cause the breakage of one gear shaft 3, and there will be no problem of cascading tooth breakage of other gears. The user only needs to replace one gear shaft 3, and no longer needs to replace all the gear shafts 3 in the cutter head box, which greatly reduces maintenance costs and maintenance time.

[0035] Optionally, the cutter head holder 1 is fixedly connected to the gear shaft 3 or splined.

[0036] Specifically, the safety protection groove 4 is located between the cutter head seat 1 and the gear 32 of the gear shaft 3.

[0037] Based on the above technical solution, it also includes a fixing bolt 5 and a locking nut 6. The gear shaft 3 has a locking through hole opened coaxially. The fixing bolt 5 includes a bolt head and a screw that are fixedly connected. The bolt head abuts against the gear shaft 3. The screw passes through the locking through hole and is threadedly connected to the locking nut 6.

[0038] After the gear shaft 3 breaks, the cutter head 1 will not fall off because of the fixing bolt 5, thus avoiding other unnecessary damage.

[0039] Based on the above technical solution, a locking groove 7 is provided on one side wall of the fixing bolt 5 along its axial direction, and the locking nut 6 has a bent piece 8, which extends or bends along the axial direction of the locking nut 6 to be inserted into the locking groove 7.

[0040] After tightening the locking nut 6, bend the bending piece 8 into the locking groove 7 to prevent the locking nut 6 from loosening.

[0041] Specifically, the locking nut 6 has multiple bent pieces 8 spaced apart circumferentially. The fixing bolt 5 has one or more locking grooves 7 circumferentially. After the locking nut 6 is tightened, at least one bent piece 8 bends into the corresponding locking groove 7.

[0042] Based on the above technical solution, both ends of the locking through hole have countersunk holes, and the bolt head and the locking nut 6 are respectively located in the two countersunk holes.

[0043] The bolt head and lock nut 6 are located in two countersunk holes, saving assembly space.

[0044] Based on the above technical solution, a bearing 9 is also included, and the middle part of the gear shaft 3 is rotatably connected to the housing 2 through the bearing 9.

[0045] In one specific example, bearing 9 is a double-row ball bearing.

[0046] Based on the above technical solution, a retaining ring 10 is also included. The gear shaft 3 includes a main shaft and a gear 32. The main shaft has a safety protection groove 4 in the middle. One end of the main shaft is fixedly connected to the gear 32. One end of the main shaft has a shoulder 31 on its side wall. The bearing 9 includes an inner ring and an outer ring that can rotate relative to each other. The inner ring is fitted in the middle of the main shaft, and one end of it abuts against the shoulder 31. The housing 2 has an inner hole. One end of the inner hole has a housing limiting end wall 21 that extends radially inward. The outer ring is fitted in the inner hole of the housing, and one end of the outer ring abuts against the housing limiting end wall 21. The retaining ring 10 is engaged with the inner hole of the housing and abuts against the other end of the outer ring. The other end of the main shaft is connected to the cutter head seat 1 and rotates synchronously.

[0047] The inner ring of bearing 9 is axially positioned by the shaft shoulder 31 and the cutter head seat 1, and the outer ring is axially positioned by the housing limiting end wall 21 and the retaining ring 10, making installation convenient.

[0048] Optionally, the other end of the inner ring directly abuts against one end of the cutter head 1, or the spindle is provided with axial positioning components such as protrusions or bushings, and the other end of the inner ring indirectly abuts against the cutter head 1 through the axial positioning components.

[0049] Based on the above technical solution, the cutter head holder 1 is connected to the spindle via a spline, and one end of the cutter head holder 1 abuts against the other end of the inner ring.

[0050] Specifically, such as Figure 5 As shown, one end of the cutter head holder 1 extends into the inner hole of the housing and abuts against the inner ring. A sealing ring is provided between the cutter head holder 1 and the inner hole of the housing. The sealing ring can prevent lubricating oil in the cutter head box from flowing out from the inner hole of the housing.

[0051] Specifically, one end face of the cutter head holder 1 and the end face of the housing 2 are fitted with a stepped structure 12, which can prevent external impurities from entering the cutter head box.

[0052] Based on the above technical solutions, such as Figure 6 As shown, the safety protection groove 4 is located at the junction of the cutter head seat 1 and the bearing 9.

[0053] After the gear shaft 3 breaks off from the safety protection groove 4, it does not affect the rotation of the gear 32.

[0054] Based on the above technical solution, it also includes an assembly nut 11, which is threadedly connected to the other end of the main shaft and abuts against the other end of the cutter head holder 1. The cutter head holder 1 is axially locked to the housing 2 by the assembly nut 11.

[0055] This embodiment also provides a cutter head box, including the aforementioned grass-cutting flattening cutter head assembly.

[0056] Specifically, the cutter head box includes a housing, and the shell 2 is fixedly connected to the housing. There are multiple cutter head assemblies for the lawn mower flattening table, and the gear shafts 3 of the multiple cutter head assemblies are connected by gear transmission.

[0057] In the description of this invention, it should be noted that the terms "axial", "radial", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0058] In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0059] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. 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.

[0060] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0061] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A grass-cutting flattening cutter head assembly, comprising a cutter head seat (1), a housing (2), a gear shaft (3), a bearing (9), and a retaining ring (10), wherein the gear shaft (3) passes through the housing (2) and is rotatably connected to the housing (2) at its center, and the cutter head seat (1) is connected to one end of the gear shaft (3) located outside the housing (2) and rotates synchronously, characterized in that, The gear shaft (3) has a safety protection groove (4) circumferentially formed on the middle side wall; the middle part of the gear shaft (3) is rotatably connected to the housing (2) through the bearing (9); the gear shaft (3) includes a main shaft and a gear (32), the safety protection groove (4) is formed in the middle of the main shaft, one end of the main shaft is fixedly connected to the gear (32), the side wall of one end of the main shaft has a shoulder (31), the bearing (9) includes an inner ring and an outer ring that can rotate relative to each other, the inner ring... The housing (2) is fitted in the middle of the main shaft and one end of the housing abuts against the shoulder (31). The housing (2) has an inner hole. One end of the inner hole has a housing limiting end wall (21) extending radially inward. The outer ring is fitted in the inner hole of the housing. One end of the outer ring abuts against the housing limiting end wall (21). The retaining ring (10) is engaged with the inner hole of the housing and abuts against the other end of the outer ring. The other end of the main shaft is connected to the cutter head (1) and rotates synchronously.

2. The grass-cutting flattening cutter head assembly according to claim 1, characterized in that, It also includes a fixing bolt (5) and a locking nut (6). The gear shaft (3) has a locking through hole opened coaxially. The fixing bolt (5) includes a bolt head and a screw that are fixedly connected. The bolt head abuts against the gear shaft (3). The screw passes through the locking through hole and is threadedly connected to the locking nut (6).

3. The grass-cutting flattening cutter head assembly according to claim 2, characterized in that, The fixing bolt (5) has a locking groove (7) on one side wall that is arranged along its axial direction. The locking nut (6) has a bent piece (8) that extends or bends along the axial direction of the locking nut (6) to be inserted into the locking groove (7).

4. The grass-cutting flattening cutter head assembly according to claim 2, characterized in that, Both ends of the locking through hole have countersunk holes, and the bolt head and the locking nut (6) are located in the two countersunk holes respectively.

5. A grass cutting flattening cutter head assembly according to any one of claims 1-4, wherein the cutter head seat (1) is connected to the main shaft via a spline, and one end of the cutter head seat (1) abuts against the other end of the inner ring.

6. The grass-cutting flattening cutter head assembly according to claim 5, characterized in that, The safety protection groove (4) is located at the junction of the cutter head seat (1) and the bearing (9).

7. The grass-cutting flattening cutter head assembly according to claim 5, characterized in that, It also includes an assembly nut (11), which is threaded to the other end of the spindle and abuts against the other end of the cutter head (1).

8. A cutter head box, characterized in that, Includes the grass-cutting and flattening cutter head assembly as described in any one of claims 1-7.

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