Gearbox and mower

Abstract

The utility model relates to the technical field of gearboxes, in particular to a gearbox which comprises a motor, a shell and a plurality of gears which are packaged in the shell and arranged in a rotating mode, and the gears are meshed with one another. The shell is provided with an output shaft and an input shaft driven by a motor to rotate, in the gears, one gear is arranged on the input shaft to form an input gear, the other gear is arranged on the output shaft to form an output gear, a mounting cavity for accommodating the gear is arranged in the shell corresponding to each gear, and the peripheral wall of the mounting cavity is in a circumferential shape; the mounting cavities and the gears in the mounting cavities are coaxially arranged, the diameter of the mounting cavities is larger than that of the gears in the mounting cavities so that gaps D can be formed between the peripheral walls of the mounting cavities and the gears in the mounting cavities, and the gaps D formed in the mounting cavities are equal; every two adjacent mounting cavities are communicated with each other; and through the equal design of the gaps between the gear and the mounting cavity, the noise generated in the working process of the gearbox can be reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of gearboxes, in particular to a gearbox and a lawn mower. Background Art

[0002] A gearbox is a mechanism used to change the speed and torque of a prime mover. It is widely used in various machines, such as lawn mowers. The gearbox mainly consists of several meshing gears, each of which is enclosed in a housing. During operation, lubricating oil or grease is usually injected into the housing to lubricate and dissipate heat for the gears.

[0003] In the related art, some gearboxes generate loud noise when working. There are many factors that affect the generation of gearbox noise. For example, the lubricating oil in the gearbox is unevenly distributed in the housing, resulting in some areas between the gears and the inner wall of the housing being unable to be filled with lubricating oil, thereby increasing the noise.

[0004] Therefore, how to reduce the noise of the gearbox has become a technical problem that needs to be solved urgently by those skilled in the art. Utility Model Content

[0005] In order to solve at least one technical problem mentioned in the background technology, the purpose of the present invention is to provide a gearbox and a lawn mower.

[0006] To achieve the above purpose, the present invention provides the following technical solutions:

[0007] On the one hand, the utility model provides a gearbox, comprising a motor, a housing, and several gears encapsulated in the housing and rotatably arranged, wherein the gears are engaged with each other; the housing is provided with an output shaft and an input shaft driven to rotate by the motor, among the gears, one gear is provided on the input shaft to constitute an input gear, and one gear is provided on the output shaft to constitute an output gear, and a mounting cavity for accommodating the gear is provided corresponding to each gear position in the housing, and the peripheral wall of the mounting cavity is circular; the mounting cavity is coaxially arranged with the gear in the mounting cavity, and the diameter of the mounting cavity is larger than the diameter of the gear in the mounting cavity to form a gap D between the peripheral walls of the two, wherein the gap D formed in each mounting cavity is equal; the adjacent mounting cavities are connected.

[0008] As an optional implementation of the present invention, the input gear is a helical gear.

[0009] As an optional implementation of the present invention, the main shaft of the motor constitutes the output shaft, and the output shaft and the input gear are integrally formed.

[0010] As an optional embodiment of the present invention, the output gear and the output shaft are separately provided, and at least one pin member is provided between the output gear and the output shaft. Under the limitation of the pin member, the output shaft and the output gear maintain synchronous rotation;

[0011] And / or a shaft sleeve is provided on the output shaft, the shaft sleeve and the output shaft are provided separately, at least one pin component is provided between the shaft sleeve and the output shaft, and under the limitation of the pin component, the output shaft and the shaft sleeve keep rotating synchronously.

[0012] As an optional embodiment of the present invention, the pin components include two, one of which is a fixed pin and the other is an elastic pin; the elastic pin is radially penetrated on the output shaft and the sleeve / output gear at the same time; the fixed pin passes through the output shaft, and a positioning groove is provided at the bottom of the sleeve / output gear, and the part of the fixed pin that passes through the output shaft is stuck in the positioning groove.

[0013] As an optional implementation of the present invention, the housing includes an upper shell and a lower shell, and the upper shell and the lower shell cover each other to form the installation cavity.

[0014] As an optional implementation of the present invention, a sealing ring is embedded between the joint surfaces of the upper shell and the lower shell.

[0015] On the other hand, the present invention provides a lawn mower comprising the above-mentioned gearbox.

[0016] Compared with the existing technology, the advantages of adopting this solution are:

[0017] By designing each gap D to be equal, the gap between each gear and the peripheral wall of the mounting cavity is equal, so that the lubricating oil can be evenly distributed in these gaps, so that the lubricating oil can evenly fill the space in the entire mounting cavity, especially the gap between the gear and the peripheral wall of the mounting cavity, which is beneficial to reduce the noise generated by the gearbox during operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural diagram of the utility model;

[0019] Figure 2 This is an exploded view of the utility model;

[0020] Figure 3 This is a schematic diagram of the structure of the utility model with the upper shell removed;

[0021] Figure 4 This is a schematic diagram of the structure of the utility model with the shell removed;

[0022] Figure 5This is the main view of the utility model;

[0023] Figure 6 for Figure 5 Cross-section view from the middle AA perspective;

[0024] Figure 7 for Figure 5 Cross-section from the middle BB perspective;

[0025] Figure 8 It is a structural diagram of the output shaft position;

[0026] Figure 9 Exploded view of the output shaft position. DETAILED DESCRIPTION

[0027] The following is an explanation and description of the technical solutions of the embodiments of the present invention in conjunction with the drawings of the embodiments of the present invention, but the following embodiments are only preferred embodiments of the present invention and are not exhaustive. Based on the embodiments in the embodiments, other embodiments obtained by those skilled in the art without creative work are all within the scope of protection of the present invention.

[0028] In the following description, terms such as "inside", "outside", "up", "down", "left", "right", etc. that indicate directions or positional relationships are only used to facilitate the description of the embodiments and simplify the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operate in a specific direction. Therefore, they should not be understood as limiting the present invention.

[0029] Example 1

[0030] See also Figure 1-9 As shown, this embodiment provides a gearbox, including a motor 2, a housing 1, and a plurality of gears encapsulated in the housing 1 and rotatably arranged, wherein the gears are meshed with each other.

[0031] The housing 1 is provided with an output shaft 3 and an input shaft 21, and both the input shaft 21 and the output shaft 3 are rotatably connected to the housing 1, wherein the input shaft 21 is directly driven to rotate by the motor 2 installed on the housing 1, and the speed and torque output by the motor 2 are output by the output shaft 3 after being shifted by each gear.

[0032] like Figure 4 As shown, among the gears, one gear is provided on the input shaft 21 to constitute the input gear 211, one gear is provided on the output shaft 3 to constitute the output gear 14, and the remaining gears are meshed between the input gear 211 and the output gear 14 to constitute the intermediate gears.

[0033] like Figure 2 、 Figure 6 、 Figure 7As shown, a mounting cavity 10 for accommodating the gear is provided in the housing 1 corresponding to each gear position, that is, one mounting cavity 10 corresponds to one gear; the peripheral wall of the mounting cavity 10 is circular, that is, the mounting cavity 10 is circular when viewed from above; the mounting cavity 10 and the gear in the mounting cavity 10 are coaxially arranged, and the coaxial arrangement here can be understood as the center of the circle or the axis of the mounting cavity 10 and the gear in the mounting cavity 10 coinciding.

[0034] The diameter of the mounting cavity 10 is larger than the diameter of the gear within it, forming a gap D between the walls of the two. For example, as shown in Figure 6, the radius of the mounting cavity 10 is r1, and the radius of the gear mounted within the mounting cavity 10 is r2. The size of the aforementioned gap D = r1 - r2. Lubricating oil fills this gap D.

[0035] The gaps D formed within each mounting cavity 10 are equal in size. In other words, the radial spacing between the outer circumferential wall of each gear and the circumferential wall of its corresponding mounting cavity 10 is equal. Furthermore, adjacent mounting cavities 10 are connected, allowing lubricating oil to enter each mounting cavity 10. At the same time, the meshing gears engage at the connecting point between the two mounting cavities 10.

[0036] By designing the gaps D to be equal, the gaps between the gears and the peripheral wall of the mounting cavity 10 are equal, so that the lubricating oil can be evenly distributed in these gaps D, so that the lubricating oil can evenly fill the space in the entire mounting cavity 10, especially the gaps between the gears and the peripheral wall of the mounting cavity 10, which is beneficial to reducing the noise generated by the gearbox during operation.

[0037] In this embodiment, Figure 2 As shown, the housing 1 includes an upper shell 11 and a lower shell 12, which cover each other to form the aforementioned mounting cavities 10. The upper shell 11 and the lower shell 12 can be fixed to each other using bolts.

[0038] As a specific implementation method, Figure 4 As shown, this gearbox includes five gears, one of which serves as the input gear 211, one as the output gear 14, and the remaining three as intermediate gears. Each intermediate gear has a dual-gear structure, meaning it includes an upper gear and a lower gear of unequal diameters. The upper and lower gears are coaxially arranged and integrally formed.

[0039] In order to distinguish them, the three intermediate gears are respectively recorded as the first gear 4, the second gear 5 and the third gear 6. The two gears of the first gear 4 are respectively recorded as the first upper gear 41 and the first lower gear 42. The two gears of the second gear 5 are respectively recorded as the second upper gear 51 and the second lower gear 52. The two gears of the third gear 6 are respectively recorded as the third upper gear 61 and the third lower gear 62.

[0040] The input gear 211 meshes with the first upper gear 41 , the first lower gear 42 meshes with the second lower gear 52 , the second upper gear 51 meshes with the third upper gear 61 , and the third lower gear 62 meshes with the output gear 14 .

[0041] It is worth noting that each upper gear and each lower gear is provided with a mounting cavity 10 corresponding thereto, for example, Figure 2 As shown, a plurality of lower slots 121 are provided on the lower shell 12 to accommodate the lower gears and the output gear 14 respectively, while an upper slot 111 is provided on the upper shell 11 to accommodate the upper gears and the input gear 211. When the upper shell 11 and the lower shell 12 are covered, the upper slot 111 and the lower slot 121 are combined to form each installation cavity 10.

[0042] In addition, in order to improve the sealing performance at the joint between the upper shell 11 and the lower shell 12 to prevent leakage of lubricating oil, in this embodiment, a sealing ring 13 is embedded between the joint surfaces of the upper shell 11 and the lower shell 12.

[0043] In this embodiment, Figure 4 As shown, the input gear 211 is preferably a helical gear, and the corresponding first upper gear 41 is also a helical gear; using a helical gear as the input gear 211 makes less noise during operation than using a spur gear as the input gear 211.

[0044] In order to further improve the noise reduction effect, the main shaft of the motor 2 constitutes the output shaft 3, and the output shaft 3 and the input gear 211 are formed as one piece, that is, the main shaft of the motor 2 is directly used as the output shaft 3, and the input gear 211 is directly formed on the main shaft of the motor 2. At this time, the motor 2, the output shaft 3, and the input gear 211 are equivalent to an integrated structure, so that the concentricity between the output shaft 3 and the input gear 211 is higher, thereby ensuring the transmission stability, which is conducive to reducing noise.

[0045] In this embodiment, the output gear 14 is provided separately from the output shaft 3; that is, they are not integrally formed. At least one pin member is provided between the output gear 14 and the output shaft 3. This pin member restrains the output shaft 3 and the output gear 14 from rotating synchronously. This pin member connects the output shaft 3 and the output gear 14, allowing them to rotate synchronously and in the same direction. Compared to integrally forming the output shaft 3 and the output gear 14, designing them as separate components simplifies manufacturing and reduces costs.

[0046] Preferably, the pin member includes two pins, one of which is a fixed pin and the other is an elastic pin, which are respectively referred to as a first fixed pin 81 and a first elastic pin 71 for distinction.

[0047] Specific, combined Figure 8 and Figure 9 As shown, the elastic pin is radially penetrated on the output shaft 3 and the sleeve 9 / output gear 14 at the same time. For example, the upper part of the output gear 14 extends axially upward to form a sleeve 142, and the sleeve 142 is sleeved on the output shaft 3; a first through hole 31 and a third through hole 33 radially penetrating the output shaft 3 are provided on the output shaft 3, and a second through hole 32 radially penetrating the sleeve 142 is provided on the sleeve 142. The first through hole 31 and the second through hole 32 are aligned with each other, and the first elastic pin 71 passes through the first through hole 31 and the second through hole 32 at the same time. At this time, under the limitation of the first elastic pin 71, the output gear 14 and the output shaft 3 are relatively positioned in the axial and circumferential directions, so that the output gear 14 and the output shaft 3 can rotate synchronously.

[0048] The first fixing pin 81 is passed through the third through hole 33, and both ends extend out of the output shaft 3; a positioning groove is provided at the bottom of the output gear 14, and the first positioning groove 141 is in a straight line shape. In the assembled state, the part of the first fixing pin 81 extending out of the output shaft 3 is inserted into the first positioning groove 141. Under the limitation of the first positioning groove 141 and the first fixing pin 81, the output gear 14 and the output shaft 3 are kept relatively positioned in the circumferential direction, that is, the two cannot rotate relative to each other.

[0049] In addition, in this embodiment, a shaft sleeve 9 is provided on the output shaft 3, and the shaft sleeve 9 rotates synchronously with the output shaft 3 and is used to connect with the actuator of the machine, for example, the shaft sleeve 9 is connected to the wheel of the lawn mower to drive the wheel to rotate.

[0050] The sleeve 9 and the output shaft 3 are separately arranged. Figure 8 and Figure 9 As shown, at least one pin member is provided between the sleeve 9 and the output shaft 3. Under the limitation of the pin member, the output shaft 3 and the sleeve 9 maintain synchronous rotation in the same direction, wherein the pin member includes two, one of which is the second fixed pin 82 and the other is the second elastic pin 72.

[0051] A fourth through hole 34 and a fifth through hole 35 are provided on the output shaft 3 and radially penetrate the output shaft 3, a sixth through hole 36 is provided on the sleeve 9 and radially penetrates the sleeve 9, and a second positioning groove 91 is provided at the bottom of the sleeve 9; after aligning the fourth through hole 34 and the sixth through hole 36, the second elastic pin 72 is passed through the fourth through hole 34 and the sixth through hole 36 at the same time, and at the same time, the second fixing pin 82 passes through the fifth through hole 35 and extends out of the output shaft 3 at both ends, and the part of the second fixing pin 82 extending outside the output shaft 3 is stuck in the second positioning groove 91, so that under the locking of the second fixing pin 82 and the second elastic pin 72, the output shaft 3 and the sleeve 9 remain relatively fixed, that is, the two rotate synchronously in the same direction.

[0052] Among them, the second fixing pin 82 and the second elastic pin 72 have the same positioning principle as the first fixing pin 81 and the first elastic pin 71. Please refer to the above description of the first fixing pin 81 and the first elastic pin 71 and will not be repeated here.

[0053] Example 2

[0054] This embodiment provides a lawn mower based on embodiment 1, wherein the gearbox of this lawn mower adopts the gearbox provided in embodiment 1. Specifically, the shaft sleeve 9 of the gearbox can be connected to the wheel of the lawn mower to drive the wheel to rotate.

[0055] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the present invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations that come within the meaning and range of equivalents of the claims be embraced within the present invention.

Claims

1. A gearbox comprising a motor, a housing, and a plurality of gears enclosed in the housing and rotatably arranged, wherein the gears are meshed with each other; the housing is provided with an output shaft and an input shaft driven to rotate by the motor, wherein one of the gears is provided on the input shaft to constitute an input gear, and one of the gears is provided on the output shaft to constitute an output gear, wherein: A mounting cavity for accommodating the gear is provided in the housing corresponding to each gear position, and the peripheral wall of the mounting cavity is circumferential; the mounting cavity is coaxially arranged with the gear in the mounting cavity, and the diameter of the mounting cavity is larger than the diameter of the gear in the mounting cavity to form a gap D between the peripheral walls of the two, wherein the gap D formed in each mounting cavity is equal; and adjacent mounting cavities are connected.

2. A gearbox according to claim 1, characterized in that: The input gear is a helical gear.

3. A gearbox according to claim 2, characterized in that: The main shaft of the motor constitutes the output shaft, and the output shaft is integrally formed with the input gear.

4. The gearbox according to claim 1, characterized in that: The output gear and the output shaft are separately provided, and at least one pin member is provided between the output gear and the output shaft. Under the limitation of the pin member, the output shaft and the output gear keep rotating synchronously; And / or a shaft sleeve is provided on the output shaft, the shaft sleeve and the output shaft are provided separately, at least one pin component is provided between the shaft sleeve and the output shaft, and under the limitation of the pin component, the output shaft and the shaft sleeve keep rotating synchronously.

5. A gearbox according to claim 4, characterized in that: The pin components include two, one of which is a fixed pin and the other is an elastic pin; the elastic pin is radially penetrated on the output shaft and the sleeve / output gear at the same time; the fixed pin passes through the output shaft, and a positioning groove is provided at the bottom of the sleeve / output gear, and the part of the fixed pin that passes through the output shaft is stuck in the positioning groove.

6. The gearbox according to claim 1, characterized in that: The housing comprises an upper shell and a lower shell, which are covered with each other to form the installation cavity.

7. A gearbox according to claim 6, characterized in that: A sealing ring is embedded between the joint surfaces of the upper shell and the lower shell.

8. A lawn mower, characterized in that: Comprising a gearbox as described in any one of claims 1-7.

Images