Gearbox body and mowing vehicle gearbox

Abstract

The utility model discloses a gearbox body and a mowing vehicle gearbox, and relates to the technical field of gearboxes, the gearbox body comprises a first box and a second box, the first box is used for allowing a first half shaft rotating along the axis in the first direction to penetrate through, the first box is provided with a first closed-loop sealing face, and the plane where the first closed-loop sealing face is located is used for being perpendicular to the first half shaft; the second box is used for installing a second half shaft which is coaxial with the first half shaft, the second box is provided with a second closed-loop sealing face, the plane where the second closed-loop sealing face is located is used for being perpendicular to the second half shaft, and the second closed-loop sealing face and the first closed-loop sealing face are in butt joint in the first direction to achieve box closing. The gearbox body solves the problems that a box body structure with an upper cover and a lower cover is long in box closing sealing face, prone to deformation and not beneficial to gearbox sealing.

Description

Technical Field

[0001] This application relates to the field of gearbox technology, and in particular to a gearbox housing and a lawnmower gearbox. Background Technology

[0002] Currently, the input mechanism of a ride-on lawnmower gearbox is generally mounted on the gearbox housing. This structure dictates that the gearbox housing can only be in the form of an upper and lower cover, with the input shaft and drive gear mounted on the upper cover. However, the upper and lower cover type of housing structure results in a longer sealing surface, making it prone to deformation and detrimental to the gearbox's sealing. Utility Model Content

[0003] The purpose of this application is to provide a gearbox housing and a lawnmower gearbox, which solves the problem that the sealing surface of the upper and lower cover type housing structure is too long, which is prone to deformation and is not conducive to the sealing of the gearbox.

[0004] To achieve the above objectives, this application provides a gearbox housing, comprising:

[0005] The first housing is used for the first half-shaft to pass through, which rotates along the axis in the first direction. The first housing is provided with a first closed-loop sealing surface, and the plane where the first closed-loop sealing surface is located is perpendicular to the first half-shaft.

[0006] The second housing is used to install the second half-shaft, which is coaxially arranged with the first half-shaft. The second housing is provided with a second closed-loop sealing surface. The plane where the second closed-loop sealing surface is located is perpendicular to the second half-shaft. The second closed-loop sealing surface and the first closed-loop sealing surface are aligned in a first direction to achieve housing closure.

[0007] In some embodiments, the gearbox housing further includes a mounting base mounted on the first housing for mounting an input shaft that rotates along an axis perpendicular to the first direction.

[0008] In some embodiments, the first housing is provided with a mounting port, and a mounting base is detachably connected to the mounting port. The mounting port communicates with the inner cavity of the first housing and is used to expose the driven gear that meshes with the driving gear on the input shaft.

[0009] In some embodiments, the mounting base includes a mounting body and a connecting body disposed around the periphery of the mounting body. The connecting body has at least two connecting holes arranged around the mounting body. The first housing also has at least two connecting posts arranged around the periphery of the mounting opening. The connecting holes are connected to the corresponding connecting posts by fasteners so that the mounting base is fixed to the first housing.

[0010] In some embodiments, the side of the mounting base near the second housing does not protrude beyond the first closed-loop sealing surface.

[0011] In some embodiments, the first closed-loop sealing surface and / or the second closed-loop sealing surface are provided with an annular sealing groove, and an elastic sealing ring is embedded in the annular sealing groove, the compression direction of the elastic sealing ring being parallel to the first direction.

[0012] In some embodiments, the first box and the second box are connected by a flange, and the flange has 8-12 sets of bolt holes, the axis of which is parallel to the first direction.

[0013] In some embodiments, a positioning structure is provided on the mating surfaces of the first box and the second box, the positioning structure including a boss and a groove that mates with the boss.

[0014] In some embodiments, a labyrinth seal structure is provided at the mating surface of the first box and the second box. The labyrinth seal structure includes at least two concentric annular protrusions, and an oil storage groove is formed between adjacent annular protrusions.

[0015] This application also provides a lawnmower gearbox, including the gearbox housing of any of the above, and further comprising:

[0016] The input shaft is installed in the first compartment of the gearbox housing.

[0017] The drive gear is connected to the input shaft.

[0018] The shift shaft is installed inside the first housing;

[0019] The driven gear is connected to the shift shaft and meshes with the driving gear.

[0020] The differential is connected to the shift shaft drive. The differential includes a first half-shaft mounted on the first gearbox and a second half-shaft mounted on the second gearbox housing.

[0021] Compared to the background technology described above, the gearbox housing provided in this application includes a first housing and a second housing. The first housing is used for a first half-shaft that rotates along an axis in a first direction to pass through. The first housing has a first closed-loop sealing surface, and the plane on which the first closed-loop sealing surface is located is perpendicular to the first half-shaft. The second housing is used for mounting a second half-shaft that is coaxially arranged with the first half-shaft. The second housing has a second closed-loop sealing surface, and the plane on which the second closed-loop sealing surface is located is perpendicular to the second half-shaft. The second closed-loop sealing surface and the first closed-loop sealing surface are aligned in the first direction to achieve housing assembly.

[0022] The gearbox housing designed in this way, using a left-right assembly structure, offers several advantages over a top-bottom assembly structure, primarily including:

[0023] Firstly, considering the overall structure of the gearbox housing, the upper and lower gearbox assembly uses a larger (longer) sealing surface, which is prone to deformation, making lubricant leakage more likely. This also increases manufacturing costs. In contrast, this application uses a left-right gearbox assembly, where the gearbox is joined along the axis of either the first or second half-shaft of the differential. This results in a smaller closed-loop sealing surface, making lubricant leakage less likely and reducing manufacturing costs. Therefore, compared to the upper and lower gearbox assembly, the left-right gearbox assembly significantly reduces the likelihood of lubricant leakage, ensuring sealing performance, improving lubrication, and reducing production costs.

[0024] Secondly, compared to the upper and lower box-type structure, the left and right box-type structure adopted in this application can maintain a more stable connection under vibration during vehicle operation. Specifically, since the connection part of the left and right box-type structures is on the lateral plane of the vehicle (the lateral plane is perpendicular to the first direction), the impact of vehicle body vibration on the box-type connection when the vehicle passes through uneven road surfaces is relatively small. In contrast, the connection part of the upper and lower box-type structure is more susceptible to vertical vibration of the vehicle (such as vertical vibration of the vehicle body caused by bumpy road surfaces).

[0025] Thirdly, during the assembly process, since the first box is used to pass through the first half-shaft that rotates along the axis in the first direction, and the second box is used to install the second half-shaft that is coaxial with the first half-shaft, the coaxiality of the two half-shafts is easier to ensure after the left and right boxes are joined. Before the left and right boxes are connected, the workers can perform preliminary installation and positioning of the first half-shaft and the second half-shaft respectively, and then precisely adjust their coaxiality through the box-joining process. Therefore, the left and right box-joining method makes the installation of the first half-shaft and the second half-shaft more advantageous.

[0026] Fourth, from a maintenance perspective, the left-right opening design makes disassembly and assembly of internal parts much easier. When it's necessary to repair or replace parts inside the transmission, such as gears or bearings, the left-right opening design allows maintenance personnel to more easily access these components. In contrast, a top-bottom opening design requires inverting the entire transmission or using other complex disassembly methods to better access the internal parts. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of this application or related technologies, the drawings used in the description of the embodiments or related technologies will be briefly introduced below. Obviously, the drawings described below are only embodiments of this application. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0028] Figure 1This is a schematic diagram of the assembly of the gearbox housing, input shaft, and differential in an embodiment of this application;

[0029] Figure 2 for Figure 1 The main view;

[0030] Figure 3 for Figure 2 A sectional view.

[0031] in:

[0032] 10-First box, 11-First closed-loop sealing surface, 12-Installation port, 13-Connecting column;

[0033] 20 - Second box; 21 - Second closed-loop sealing surface;

[0034] 30-Mounting base, 31-Mounting body, 32-Connecting body, 321-Connecting hole;

[0035] 40-Fasteners;

[0036] 50 - Input axis;

[0037] 60 - Drive gear;

[0038] 70-Shift shaft;

[0039] 80 - Driven gear;

[0040] 90 - Differential, 91 - First half-shaft, 92 - Second half-shaft. Detailed Implementation

[0041] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0042] To enable those skilled in the art to better understand the present application, the present application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0043] It should be noted that the directional terms such as "upper end," "lower end," "left side," and "right side" mentioned below are defined based on the accompanying drawings in the instruction manual.

[0044] Please refer to Figure 1 , Figure 2 and Figure 3 , Figure 1 This is a schematic diagram of the assembly of the gearbox housing, input shaft, and differential in an embodiment of this application; Figure 2 for Figure 1 The main view; Figure 3 for Figure 2 A sectional view.

[0045] The gearbox housing provided in this application embodiment includes a first housing 10 and a second housing 20. The first housing 10 is used for the first half-shaft 91 of the differential 90 to pass through, and the first half-shaft 91 rotates along the axis of a first direction. The second housing 20 is used for mounting the second half-shaft 92 of the differential 90, and the second half-shaft 92 is coaxially arranged with the first half-shaft 91.

[0046] It should be noted that the differential 90 inside the gearbox housing has a differential cover, two half-shafts (first half-shaft 91 and second half-shaft 92), two half-shaft gears, a planetary gear shaft, and two planetary gears. When the torque output by the engine is transmitted to the differential cover through the intermediate gear, the differential cover drives the two planetary gears to rotate, and the two planetary gears drive the two half-shaft gears to rotate, thereby enabling the two half-shafts to drive the wheels and propel the entire vehicle.

[0047] Based on the above, the first box 10 is provided with a first closed-loop sealing surface 11, and the plane on which the first closed-loop sealing surface 11 is located is perpendicular to the first half-shaft 91. The second box 20 is provided with a second closed-loop sealing surface 21, and the plane on which the second closed-loop sealing surface 21 is located is perpendicular to the second half-shaft 92. The second closed-loop sealing surface 21 and the first closed-loop sealing surface 11 are connected along the first direction to realize the box closing.

[0048] In other words, the gearbox housing provided in this application embodiment adopts a left-right combined structure, which has the following advantages compared to a top-bottom combined structure:

[0049] Firstly, considering the overall structure of the gearbox housing, the upper and lower gearbox structure uses a larger (longer) sealing surface, which is prone to deformation, making lubricant leakage more likely from the mating surface. This also increases manufacturing costs. In contrast, this application uses a mating method along the axis of the first half-shaft 91 or the second half-shaft 92 of the differential 90, i.e., a left-right mating method. This results in a smaller overall closed-loop sealing surface, making lubricant leakage less likely and reducing manufacturing costs. Therefore, compared to the upper and lower gearbox structure, the left-right mating structure significantly reduces the possibility of lubricant leakage, ensuring sealing performance, improving lubrication, and reducing production costs.

[0050] Secondly, compared to the upper and lower box-type structure, the left and right box-type structure adopted in this application can maintain a more stable connection under vibration during vehicle operation. Specifically, since the connection part of the left and right box-type structures is on the lateral plane of the vehicle (the lateral plane is perpendicular to the first direction), the impact of vehicle body vibration on the box-type connection when the vehicle passes through uneven road surfaces is relatively small. In contrast, the connection part of the upper and lower box-type structure is more susceptible to vertical vibration of the vehicle (such as vertical vibration of the vehicle body caused by bumpy road surfaces).

[0051] Thirdly, during the assembly process, since the first box 10 is used to allow the first half-shaft 91, which rotates along the axis in the first direction, to pass through, and the second box 20 is used to install the second half-shaft 92, which is coaxially set with the first half-shaft 91, after the left and right boxes are joined, the coaxiality of the two half-shafts is easier to ensure. Before the left and right boxes are joined, the workers can perform preliminary installation and positioning of the first half-shaft 91 and the second half-shaft 92 respectively, and then precisely adjust their coaxiality through the box-joining process. Therefore, the left and right box-joining method makes the installation of the first half-shaft 91 and the second half-shaft 92 more advantageous.

[0052] Fourth, from a maintenance perspective, the left-right opening design makes disassembly and assembly of internal parts much easier. When it's necessary to repair or replace parts inside the transmission, such as gears or bearings, the left-right opening design allows maintenance personnel to more easily access these components. In contrast, a top-bottom opening design requires inverting the entire transmission or using other complex disassembly methods to better access the internal parts.

[0053] In some embodiments, the gearbox housing further includes a mounting base 30, which is mounted on the first housing 10 and is used to mount an input shaft 50 that rotates along an axis perpendicular to the first direction.

[0054] The first direction can be as follows: Figure 2 The horizontal direction shown can be followed by the second direction, which can be as follows: Figure 2 The vertical direction is shown.

[0055] During installation, the input shaft 50, bearing, and drive gear 60 can be assembled on the mounting base 30 and then assembled together onto the first box 10.

[0056] In this way, when the torque output by the engine is transmitted to the input shaft 50 through the belt, the input shaft 50 drives the drive gear 60 to rotate, and the drive gear 60 drives the driven gear 80, thereby transmitting the torque.

[0057] In some embodiments, the first housing 10 is provided with a mounting port 12, and the mounting base 30 is detachably connected to the mounting port 12. The mounting port 12 communicates with the inner cavity of the first housing 10, and the mounting port 12 is used to expose the driven gear 80 that meshes with the driving gear 60 on the input shaft 50.

[0058] From the perspective of disassembly and maintenance, the mounting base 30 for mounting the input shaft 50 is detachably connected to the mounting port 12 of the first housing 10, which facilitates the disassembly and maintenance of the input shaft 50 and the drive gear 60 on the input shaft 50. When it is necessary to repair or replace the parts inside the first housing 10 (such as the driven gear 80 and bearings), the mounting base 30 can be disassembled so that the parts inside the first housing 10 can be operated through the mounting port 12.

[0059] Specifically, the mounting base 30 includes a mounting body 31 and a connecting body 32 disposed around the mounting body 31. The connecting body 32 is provided with at least two connecting holes 321 arranged around the mounting body 31. The first housing 10 is also provided with at least two connecting posts 13 arranged around the mounting opening 12. The connecting holes 321 are connected to the corresponding connecting posts 13 by fasteners 40 so that the mounting base 30 is fixed to the first housing 10.

[0060] Of course, the fastener 40 can be a bolt or a screw, and the number of connecting holes 321 and connecting posts 13 can both be set to three and evenly distributed along the circumference to ensure the stability and reliability of the connection between the mounting base 30 and the first box 10.

[0061] In some embodiments, the side of the mounting base 30 near the second housing 20 does not protrude from the first closed-loop sealing surface 11.

[0062] In other words, the mounting base 30 can be located on the side of the first closed-loop sealing surface 11 away from the second box 20, or the side of the mounting base 30 close to the second box 20 can be flush with the first closed-loop sealing surface 11 to prevent interference when the first box 10 and the second box 20 are docked.

[0063] In some embodiments, the first closed-loop sealing surface 11 and / or the second closed-loop sealing surface 21 are provided with an annular sealing groove, and an elastic sealing ring is embedded in the annular sealing groove, the compression direction of the elastic sealing ring being parallel to the first direction.

[0064] In this way, when the first closed-loop sealing surface 11 and the second closed-loop sealing surface 21 are aligned in the first direction, the gap between the first closed-loop sealing surface 11 and the second closed-loop sealing surface 21 can be sealed by compressing the elastic sealing ring, thus ensuring the sealing performance of the enclosure.

[0065] In some embodiments, the first box 10 and the second box 20 are connected by a flange, and the flange has 8-12 sets of bolt connection holes, the axis of which is parallel to the first direction.

[0066] For example, the same number of bolt connection holes can be distributed at intervals along the outer edges of the first closed-loop sealing surface 11 and the second closed-loop sealing surface 21. After the first closed-loop sealing surface 11 and the second closed-loop sealing surface 21 are aligned in the first direction, the bolt connection holes along the outer edges of the first closed-loop sealing surface 11 and the second closed-loop sealing surface 21 are connected by bolts to complete the box-closing operation of the first box 10 and the second box 20.

[0067] In some embodiments, a positioning structure is provided on the mating surface of the first box 10 and the second box 20. The positioning structure includes a boss and a groove that mates with the boss.

[0068] In this way, when the first closed-loop sealing surface 11 and the second closed-loop sealing surface 21 are aligned along the first direction, the positioning of the alignment of the first closed-loop sealing surface 11 and the second closed-loop sealing surface 21 can be achieved through the nesting and cooperation of the boss and the groove, thereby ensuring the accuracy of the alignment.

[0069] For example, the boss can be located on the outer edge of the first closed-loop sealing surface 11, and the groove can be located on the outer edge of the second closed-loop sealing surface 21.

[0070] In some embodiments, a labyrinth-type sealing structure is provided at the mating surface of the first box 10 and the second box 20. The labyrinth-type sealing structure includes at least two concentric annular protrusions, and an oil storage groove is formed between adjacent annular protrusions.

[0071] Considering the possibility of lubricating oil leakage at the mating surface of the first gearbox 10 and the second gearbox 20 during gearbox operation, a labyrinth seal structure with multiple annular protrusions forms layers of barriers to block the lubricating oil. When lubricating oil attempts to flow from one annular protrusion to another, the oil reservoir temporarily stores the leaking lubricating oil, slowing down the leakage rate and effectively preventing large-scale loss of lubricating oil. This maintains a stable lubricating oil level inside the gearbox and ensures proper lubrication of internal gearbox components. Simultaneously, when minor relative movement occurs between the first gearbox 10 and the second gearbox 20 due to mechanical vibration, the lubricating oil in the reservoir forms an oil film at the contact points of the annular protrusions, reducing friction between the protrusions, minimizing wear, and extending the service life of the labyrinth seal structure.

[0072] Furthermore, during vehicle operation, road dust may be brought into the vicinity of the transmission housing. The labyrinthine sealing structure with its multiple barriers prevents this dust from entering the transmission housing, avoiding the mixing of impurities with lubricating oil and causing wear on gears and other components. This ensures a clean environment inside the transmission, contributing to improved reliability and precision.

[0073] The lawnmower gearbox provided in this application includes the gearbox housing described in the above specific embodiments, and also includes an input shaft 50, a drive gear 60, a shift shaft 70, a driven gear 80, and a differential 90.

[0074] The input shaft 50 is installed in the first housing 10 of the gearbox housing, the drive gear 60 is connected to the input shaft 50, the shift shaft 70 is installed in the first housing 10, the driven gear 80 is connected to the shift shaft 70 and meshes with the drive gear 60, and the differential 90 is connected to the shift shaft 70 in a transmission. The differential 90 includes a first half-shaft 91 installed inside the first housing 10 and a second half-shaft 92 installed inside the second housing 20 of the gearbox housing.

[0075] In this way, when the torque output by the engine is transmitted to the input shaft 50 through the belt, the input shaft 50 drives the drive gear 60 to rotate, the drive gear 60 drives the driven gear 80, and the shift shaft 70 transmits torque to the differential cover of the differential 90 through the intermediate gear, thereby realizing the operation of the first half-shaft 91 and the second half-shaft 92 of the differential 90.

[0076] It should be noted that in this specification, relational terms such as first and second are used only to distinguish one entity from several other entities, and do not necessarily require or imply any such actual relationship or order between these entities.

[0077] The gearbox housing and lawnmower gearbox provided in this application have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The descriptions of the embodiments above are only for the purpose of helping to understand the solution and core ideas of this application. It should be noted that those skilled in the art can make several improvements and modifications to this application without departing from the principles of this application, and these improvements and modifications also fall within the protection scope of this application.

Claims

1. A gearbox housing, characterized in that include: The first box (10) is used for the first half-shaft (91) to be rotated along the axis in the first direction. The first box (10) is provided with a first closed-loop sealing surface (11). The plane where the first closed-loop sealing surface (11) is located is perpendicular to the first half-shaft (91). The second box (20) is used to install the second half shaft (92) which is coaxially arranged with the first half shaft (91). The second box (20) is provided with a second closed-loop sealing surface (21). The plane where the second closed-loop sealing surface (21) is located is perpendicular to the second half shaft (92). The second closed-loop sealing surface (21) and the first closed-loop sealing surface (11) are connected along the first direction to realize the box closing.

2. The transmission case as set forth in claim 1, characterized by The gearbox housing also includes a mounting base (30), which is mounted on the first housing (10) and is used to mount an input shaft (50) that rotates along an axis perpendicular to the first direction.

3. A gearbox housing as claimed in claim 2, characterised in that, The first box (10) is provided with a mounting port (12), and the mounting base (30) is detachably connected to the mounting port (12). The mounting port (12) communicates with the inner cavity of the first box (10). The mounting port (12) is used to expose the driven gear (80) that meshes with the driving gear (60) on the input shaft (50).

4. A gearbox housing as claimed in claim 3, characterised in that, The mounting base (30) includes a mounting body (31) and a connecting body (32) disposed around the mounting body (31). The connecting body (32) is provided with at least two connecting holes (321) arranged around the mounting body (31). The first box (10) is also provided with at least two connecting posts (13) arranged around the mounting port (12). The connecting holes (321) are connected to the corresponding connecting posts (13) by fasteners (40) so that the mounting base (30) is fixed to the first box (10).

5. The transmission case of claim 2, wherein, The mounting base (30) does not protrude from the first closed-loop sealing surface (11) on the side near the second box (20).

6. A gearbox housing according to any one of claims 1-5, characterized in that The first closed-loop sealing surface (11) and / or the second closed-loop sealing surface (21) are provided with an annular sealing groove, and an elastic sealing ring is embedded in the annular sealing groove. The compression direction of the elastic sealing ring is parallel to the first direction.

7. The gearbox housing as described in any one of claims 1-5, characterized in that, The first box (10) and the second box (20) are connected by a flange, and the flange has 8-12 sets of bolt connection holes, the axis of which is parallel to the first direction.

8. A gearbox housing according to any one of claims 1-5, characterized in that The first box (10) and the second box (20) are provided with positioning structures on their mating surfaces. The positioning structures include bosses and grooves that cooperate with the bosses.

9. A gearbox housing according to any one of claims 1-5, characterized in that The first box (10) and the second box (20) are provided with a labyrinth-type sealing structure at their mating surfaces. The labyrinth-type sealing structure includes at least two concentric annular protrusions, and an oil storage groove is formed between adjacent annular protrusions.

10. A mower vehicle transmission, characterized in that Including the gearbox housing as described in any one of claims 1-9, further comprising: The input shaft (50) is installed in the first housing (10) of the gearbox housing. The drive gear (60) is connected to the input shaft (50); The shift shaft (70) is installed inside the first housing (10); The driven gear (80) is connected to the shift shaft (70) and meshes with the driving gear (60); The differential (90) is connected to the shift shaft (70) and includes a first half-shaft (91) mounted on the first housing (10) and a second half-shaft (92) mounted on the second housing (20) of the gearbox housing.

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