A gearbox and a lawn mower

Abstract

This utility model provides a gearbox and a lawn mower. The gearbox includes a housing, a first shaft, and a second shaft. The housing has a first chamber and a second chamber that communicate with each other. The second chamber is located below the first chamber. A first bevel gear is mounted on the first shaft. A second bevel gear meshes with the first bevel gear on the second shaft. The first chamber has a first wall and a second wall. The first wall faces a first mounting opening and protrudes towards the first bevel gear. The second wall connects the first wall and the walls of the second chamber, and is located above some teeth of the second bevel gear. The protrusion of the first wall towards the first bevel gear compresses the space of the first chamber, thus allowing the grease to be more concentrated in the meshing area of ​​the first and second bevel gears, improving the lubrication effect. The design of the second wall can prevent some of the grease from being thrown out.

Description

Technical Field

[0001] This utility model relates to the field of grass trimmer technology, specifically to a gearbox and a grass trimmer. Background Technology

[0002] The main function of a lawnmower is to cut weeds, shrubs, etc., using high-speed rotating blades or nylon ropes, while the core function of the gearbox is to transmit power. The two bevel gears inside the gearbox rely on grease for cooling and friction reduction when rotating at high speeds. Insufficient grease can lead to hard friction between the gears, easily causing problems such as wear on the transmission rod and engine overload.

[0003] When bevel gears operate, they generate significant lateral and centrifugal forces, which can cause some grease to be thrown away from the gear contact surfaces, affecting lubrication. Some gearboxes are typically composed of two cylindrical bodies connected together. At the junction of the two bodies, the internal space is relatively large. After a period of use, the grease becomes more dispersed in the internal cavity, thus reducing its lubrication effect on the two bevel gears. Utility Model Content

[0004] In view of the deficiencies in the prior art, the purpose of this utility model is to provide a gearbox and a lawn mower to solve or at least alleviate one or more of the above-mentioned technical problems or other problems existing in the prior art.

[0005] To achieve the above objectives, this utility model provides a gearbox, including a housing having a first chamber and a second chamber communicating with each other, the second chamber being located below the first chamber, the first chamber having a first assembly port, and the second chamber having a second assembly port; a first shaft, which is sealed and rotatably fitted within the first assembly port and extends into the first chamber, the first shaft being provided with a first bevel gear, the first bevel gear being located in the first chamber; and a second shaft, which is sealed and rotatably fitted within the second assembly port and extends into the second chamber, the axis of the second shaft intersecting the axis of the first shaft, the second shaft being provided with a second bevel gear meshing with the first bevel gear, the second bevel gear being located in the second chamber;

[0006] The first chamber is provided with a first wall and a second wall. The first wall is directly opposite the first assembly port and protrudes towards the first bevel gear. The second wall is located below the first wall and inclined towards the second assembly port. The second wall connects the first wall and the cavity wall of the second chamber respectively. The second wall is located above part of the teeth of the second bevel gear.

[0007] Preferably, the outer side wall of the housing away from the first assembly opening is recessed toward the first assembly opening and forms a recessed portion, wherein the recessed portion forms the first wall and the second wall within the first cavity.

[0008] Preferably, the second wall has a curved structure.

[0009] Preferably, the top of the first chamber is provided with a mounting groove, which is located between the first bevel gear and the first wall, and the top of the second shaft is rotatably fitted in the mounting groove.

[0010] Preferably, the mounting groove has a notch, which is directly opposite the first assembly port.

[0011] Preferably, the outer wall of the box body is provided with multiple ribs.

[0012] Preferably, two reinforcing blocks are provided at the corners of the box body.

[0013] Preferably, the housing is provided with a filling hole that communicates with the first chamber.

[0014] Preferably, the filling hole is located above the first bevel gear.

[0015] This utility model also provides a lawn mower, including the gearbox described above.

[0016] The beneficial effects of this utility model are:

[0017] This utility model discloses a gearbox and a lawnmower. By designing a first wall and a second wall within the gearbox, the first wall protrudes towards the first bevel gear, compressing the space of the first chamber and reducing its size. This allows the grease to be more concentrated in the meshing area of ​​the first and second bevel gears, improving lubrication. When the second bevel gear rotates at high speed, the grease adhering to it may be thrown off due to centrifugal force. The design of the second wall can prevent some of the thrown-off grease. Furthermore, because the second wall is close to the teeth of the second bevel gear, the teeth can easily carry away some of the grease from the second wall. After meshing with the first bevel gear, this ensures lubrication of both gears and reduces grease waste. Attached Figure Description

[0018] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.

[0019] Figure 1 A cross-sectional schematic diagram of a gearbox provided in an embodiment of the present utility model;

[0020] Figure 2 This is a cross-sectional view of the box.

[0021] Figure 3 This is a schematic diagram of the internal structure of the box;

[0022] Figure 4 This is a structural diagram of the box.

[0023] Figure label:

[0024] 10. Housing; 11. First chamber; 111. First wall; 112. Second wall; 12. Second chamber; 13. First assembly port; 14. Second assembly port; 15. Recess; 16. Mounting groove; 161. Notch; 17. Rib; 18. Reinforcing block; 19. Filling hole; 20. First shaft; 30. First bevel gear; 40. Second shaft; 50. Second bevel gear; 61. First bearing; 62. Second bearing; 63. Third bearing. Detailed Implementation

[0025] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings. These embodiments are merely illustrative of the present invention and should not be construed as limiting the scope of protection of the present invention.

[0026] It should be noted that, unless otherwise stated, the technical or scientific terms used in this application shall have the ordinary meaning as understood by one of ordinary skill in the art to which this utility model pertains.

[0027] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0028] Furthermore, the terms "first," "second," etc., 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. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly defined.

[0029] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," 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 or an electrical connection; 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. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0030] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0031] like Figure 1-4 As shown, in one embodiment of this utility model, a gearbox is provided, including a housing 10, a first shaft 20, a first bevel gear 30, a second shaft 40, and a second bevel gear 50. The housing 10 has a first chamber 11 and a second chamber 12 that communicate with each other. The second chamber 12 is located below the first chamber 11. The first chamber 11 has a first mounting port 13, and the second chamber 12 has a second mounting port 14. The first shaft 20 is rotatably fitted in the first mounting port 13 by a first bearing 61 and extends into the first chamber 11. The first shaft 20 is provided with the first bevel gear 30, which is located in the first chamber 11.

[0032] The second shaft 40 is also sealed and rotatably fitted within the second assembly port 14 via the second bearing 62 (both the first bearing 61 and the second bearing 62 are sealed bearings), and extends into the second chamber 12. The axis of the second shaft 40 is perpendicular to the axis of the first shaft 20. The second shaft 40 is provided with a second bevel gear 50 that meshes with the first bevel gear 30, and the second bevel gear 50 is located in the second chamber 12. The first chamber 11 is provided with a first wall 111 and a second wall 112. The first wall 111 has a planar structure, faces the first assembly port 13, and protrudes towards the first bevel gear 30. The second wall 112 is located below the first wall 111 and is inclined towards the second assembly port 14. The second wall 112 connects the first wall 111 and the cavity wall of the second chamber 12, and is located above some of the teeth of the second bevel gear 50.

[0033] This embodiment discloses a gearbox that, by designing a first wall 111 and a second wall 112 within the housing 10, compresses the space of the first chamber 11 by having the first wall 111 protrude towards the first bevel gear 30, thus reducing the space of the first chamber 11. This allows the grease to be more concentratedly distributed in the meshing area of ​​the first bevel gear 30 and the second bevel gear 50, improving the lubrication effect on the first bevel gear 30 and the second bevel gear 50. When the second bevel gear 50 rotates at high speed, the grease adhering to it may be thrown off due to centrifugal force. The design of the second wall 112 can block some of the thrown-off grease. Furthermore, since the second wall 112 is close to the teeth of the second bevel gear 50, the teeth of the second bevel gear 50 can easily carry away some of the grease from the second wall 112. After meshing with the first bevel gear 30, lubrication of both the first bevel gear 30 and the second bevel gear 50 can be achieved, reducing grease waste.

[0034] In one embodiment, the outer wall of the housing 10 away from the first mounting opening 13 is recessed towards the first mounting opening 13, forming a recessed portion 15. The recessed portion 15 forms a first wall 111 and a second wall 112 within the first chamber 11. This structural design reduces the overall volume of the housing 10, thereby reducing its weight and improving the flexibility of operating the lawn mower.

[0035] In one embodiment, the second wall 112 has a curved structure, and the structural design of the second wall 112 improves the fit between the second wall 112 and the outer contour of the second bevel gear 50.

[0036] In one embodiment, the top of the first chamber 11 is provided with a mounting groove 16, which is located between the first bevel gear 30 and the first wall 111. A third bearing 63 is installed in the mounting groove 16, and the top of the second shaft 40 is rotatably fitted in the mounting groove 16 through the third bearing 63. By cooperating with the second bearing 62 and the third bearing 63, the stability of the second shaft 40 during high-speed rotation can be improved.

[0037] In one embodiment, to facilitate the disassembly and assembly of the third bearing 63, the mounting groove 16 is provided with a notch 161, which is directly opposite the first assembly port 13.

[0038] In one embodiment, the outer side wall of the enclosure 10 is provided with multiple ribs 17. The ribs 17 can not only improve the overall structural strength of the enclosure 10, but also increase the surface area of ​​the enclosure 10, thereby improving the heat dissipation effect of the enclosure 10 and reducing the internal temperature of the enclosure 10.

[0039] In one embodiment, in order to further enhance the overall structural strength of the housing 10, two reinforcing blocks 18 are provided at the corners of the housing 10.

[0040] In one embodiment, in order to facilitate the later addition of lubricating grease, the housing 10 is provided with a filling hole 19 that communicates with the first chamber 11. Of course, a plug is fitted inside the filling hole 19.

[0041] In one embodiment, the filling hole 19 is located above the first bevel gear 30. After grease is added through the filling hole 19, the grease can fall directly onto the first bevel gear 30. In this way, after the first bevel gear 30 rotates, lubrication of the first bevel gear 30 and the second bevel gear 50 can be achieved.

[0042] This embodiment also provides a lawn mower, including the gearbox described above. Because it uses the aforementioned gearbox, it has the same working principle and technical effects as the gearbox in the above embodiment, and will not be repeated here.

[0043] Numerous specific details are set forth in this specification. However, it will be understood that embodiments of this invention may be practiced without these specific details. In some instances, well-known methods, structures, and techniques have not been shown in detail so as not to obscure the understanding of this specification.

[0044] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model, and they should all be covered within the scope of the claims and specification of this utility model.

Claims

1. A gear box, characterized in that, include: The housing (10) has a first chamber (11) and a second chamber (12) that are connected to each other. The second chamber (12) is located below the first chamber (11). The first chamber (11) has a first assembly port (13), and the second chamber (12) has a second assembly port (14). A first shaft (20) is rotatably fitted into the first assembly port (13) and extends into the first chamber (11). A first bevel gear (30) is provided on the first shaft (20), and the first bevel gear (30) is located in the first chamber (11). The second shaft (40) is sealed and rotatably fitted in the second assembly port (14) and extends into the second chamber (12). The axis of the second shaft (40) intersects with the axis of the first shaft (20). The second shaft (40) is provided with a second bevel gear (50) that meshes with the first bevel gear (30). The second bevel gear (50) is located in the second chamber (12). The first chamber (11) is provided with a first wall (111) and a second wall (112). The first wall (111) is directly opposite the first assembly port (13) and protrudes toward the first bevel gear (30). The second wall (112) is located below the first wall (111) and inclined toward the second assembly port (14). The second wall (112) connects the first wall (111) and the cavity wall of the second chamber (12) respectively. The second wall (112) is located above part of the teeth of the second bevel gear (50).

2. The gear case of claim 1, wherein, The outer side wall of the housing (10) away from the first assembly port (13) is recessed toward the first assembly port (13) and a recessed portion (15) is formed therein. The recessed portion (15) forms the first wall (111) and the second wall (112) in the first chamber (11).

3. The gear case of claim 2, wherein, The second wall (112) has a curved structure.

4. The gear case of claim 2, wherein, The top of the first chamber (11) is provided with a mounting groove (16), which is located between the first bevel gear (30) and the first wall (111). The top of the second shaft (40) is rotatably fitted in the mounting groove (16).

5. The gear case of claim 4, wherein, The mounting slot (16) is provided with a notch (161), which is directly opposite the first assembly port (13).

6. The gear case of claim 1, wherein, The outer side wall of the box (10) is provided with multiple ribs (17).

7. The gear case of claim 1, wherein, Two reinforcing blocks (18) are provided at the corners of the box (10).

8. The gear case of claim 1, wherein, The housing (10) is provided with a filling hole (19) that communicates with the first chamber (11).

9. The gearbox according to claim 8, characterized in that, The filling hole (19) is located above the first bevel gear (30).

10. A lawn mower, characterized in that, The gearbox includes any one of claims 1-9.

Images