Lawn mower gear box with mowing head

Abstract

The utility model relates to the technical field of mowing machines, and provides a protective cover and a mowing machine gearbox of a mowing head, the protective cover is installed on the mowing machine gearbox, the protective cover comprises a protective cover body and a locking plate, a connecting part is arranged between the protective cover body and the locking plate, and the connecting part is connected with the protective cover body. And a plurality of limiting holes are formed between the protective cover body and the locking plate through the connection of the connecting parts. The protective cover is provided with the locking plate, when the bearing in the gear box falls off due to neglected loading of the second clamp spring, the bearing can be limited in the gear box by the locking plate, and the problems that the output shaft is stuck and a machine is damaged due to falling off of the bearing are avoided.

Description

Technical Field

[0001] This utility model relates to the field of lawnmower technology, and in particular to a lawnmower gearbox with a protective cover and a trimmer head. Background Technology

[0002] Currently, lawnmowers are widely used in landscaping and other fields to trim branches and remove weeds. Lawnmowers are powered by gasoline engines or electric motors, with the power transmitted through a gearbox. The gear shaft drives the mowing heads to rotate, trimming or cutting weeds, shrubs, and other vegetation.

[0003] Current lawnmowers typically include a gearbox and a trimmer head connected to the gearbox via a splined shaft. A protective cover is installed on the gearbox to prevent weeds from getting tangled on the splined shaft between the gearbox and the trimmer head housing. However, since the protective cover is directly fitted onto the gearbox port, if the retaining ring is missing or damaged, the splined shaft and the bearing on the splined shaft connected to the output shaft will detach, causing the trimmer head driven by the output shaft to fall off. This can result in injury to personnel, damage to the machine, and reduced work efficiency. Utility Model Content

[0004] To achieve the above objectives, this utility model provides the following technical solution:

[0005] This utility model provides a protective cover, which is installed on the gearbox of a lawnmower. The protective cover includes a protective cover body and a locking plate. A connecting part is provided between the protective cover body and the locking plate, and multiple limiting holes are formed by the connection of the connecting part. Compared with existing protective covers, this application has an additional locking plate and the formed limiting holes, which allows a part of the gearbox to be locked into the limiting holes. When the retaining spring inside the gearbox is missing or damaged, the locking plate can restrict the bearing inside the gearbox, preventing the bearing from falling off and thus avoiding the problem of the output shaft falling off and injuring personnel. In addition, it also prevents some weeds from getting tangled on the output shaft between the gearbox body and the lawn mower head housing, which would increase the load on the lawn mower head, reduce the speed, or even cause the output shaft to jam and damage the machine.

[0006] Preferably, the locking plate is disposed inside the protective cover.

[0007] Furthermore, the locking plate is provided with a placement hole coaxially arranged with the limiting hole, and the placement hole allows the spline shaft to pass through.

[0008] Furthermore, the locking plate includes a first locking plate portion connected to the connecting portion and a second locking plate portion not connected to the connecting portion. The first locking plate portion and the second locking plate portion are located on different horizontal planes. Specifically, the plane where the first locking plate portion is located is farther away from the plane where the protective cover surface is located than the plane where the second locking plate portion is located, so that it can better fit the part of the gearbox housing port that is not equipped with a locking block.

[0009] Furthermore, the protective cover is provided with a first fixing hole, which is used to fix it to the gearbox housing.

[0010] This utility model also provides a lawnmower gearbox for a lawn mower head, including a gearbox housing and the aforementioned protective cover. A protruding locking block is located at the port of the gearbox housing, and the locking block is placed within a limiting hole, the limiting hole being fan-shaped. Preferably, the number of locking blocks and limiting holes is the same, and their shapes match each other. The port of the gearbox housing is also provided with a placement groove for placing a connecting part, the placement groove being spaced apart from the locking block.

[0011] Furthermore, two U-shaped slots are provided at the other end of the gearbox housing. The two U-shaped slots are arranged correspondingly, and the gearbox housing is not easy to break by providing U-shaped slots.

[0012] Furthermore, both openings of the U-shaped slot are provided with locking parts, which are locked by fasteners. By providing locking parts on both sides of the gearbox housing, the aluminum tube can be locked more effectively.

[0013] Furthermore, the outer periphery of the port of the gearbox housing is provided with a connection area for connection with the protective cover. The connection area is provided with a second fixing hole, and the gearbox housing and the protective cover are connected through the second fixing hole, the first fixing hole, and fasteners. Preferably, the connection area is triangular, and the circumcircle of the triangle is close to the surface of the protective cover.

[0014] Furthermore, the gearbox housing is provided with honeycomb-shaped heat dissipation grooves, which can better dissipate heat from the inside of the gearbox housing during grass cutting.

[0015] Furthermore, the lawnmower gearbox also includes a first bearing, a second bearing, a third bearing, a splined shaft, a large gear, a small gear, an upper pressure plate, a lower pressure plate, a protective cover, a shaft clip, a first retaining ring, and a second retaining ring. The first bearing is connected to the splined shaft, one end of which is fitted inside the large gear. The large gear is connected inside the gearbox housing via the second bearing. The other end of the splined shaft passes through the first bearing, the protective cover, the lower pressure plate, the upper pressure plate, and the protective cover in sequence, and extends to the other side of the protective cover where an anti-loosening nut is connected. The protective cover is connected to the port of the gearbox housing via an internal hex bolt. Inside the gearbox housing and corresponding to the large gear, a small gear is connected. A connecting rod on the small gear is sleeved with the third bearing. A first retaining ring is fixedly fitted in the inner wall of the gearbox housing below the third bearing. A second retaining ring is fixedly fitted in the inner wall of the gearbox housing and corresponding to the first bearing. One end of the connecting rod on the small gear passes through the third bearing and extends to the other side of the third bearing where a shaft clip is fixedly fitted.

[0016] This utility model has the following beneficial effects:

[0017] (1) The protective cover of this utility model is provided with a locking plate and a limiting hole, so that part of the gearbox can be inserted into the limiting hole. When the retaining spring in the gearbox is missing or damaged, the locking plate can restrict the bearing in the gearbox, thus preventing the bearing from falling off and thus avoiding the problem of the output shaft falling off and injuring personnel. In addition, it also prevents some weeds from getting tangled on the output shaft between the gearbox body and the grass trimmer head housing, which would increase the load on the grass trimmer head, reduce the speed, or even cause the output shaft to jam and damage the machine.

[0018] (2) The protruding locking block on the port of the gearbox housing of this utility model is placed in the limiting hole in the protective cover, which can prevent the bearing in the gearbox housing from falling off.

[0019] (3) The gearbox housing of this utility model is provided with honeycomb-shaped heat dissipation grooves, which can better dissipate heat.

[0020] (4) Two U-shaped slots are provided at the other end of the gearbox housing of this utility model. The two U-shaped slots are arranged correspondingly. By providing U-shaped slots, the gearbox housing is not easy to break. Locking parts are provided at both openings of the U-shaped slots. The locking parts are locked by fasteners. By providing locking parts on both sides of the gearbox housing, the aluminum tube can be locked better. Attached Figure Description

[0021] Figure 1 This is a three-dimensional schematic diagram of the protective cover in Embodiment 1.

[0022] Figure 2 This is a plan view of the protective cover in Embodiment 1.

[0023] Figure 3 This is a schematic diagram of the gearbox housing in Example 2.

[0024] Figure 4 This is a schematic diagram of the connection between the gearbox housing and the protective cover in Embodiment 2.

[0025] Figure 5 This is an overall schematic diagram of Example 2.

[0026] Figure 6 This is an exploded view of Example 2. Detailed Implementation

[0027] The specific embodiments of this utility model are described in detail below with reference to the accompanying drawings. It should be noted that the embodiments are only specific descriptions of the utility model and should not be regarded as limitations on the utility model. The purpose of the embodiments is to enable those skilled in the art to better understand and reproduce the technical solution of this utility model. The protection scope of this utility model should still be determined by the scope defined in the claims. Example

[0028] like Figure 1-2 As shown, this embodiment provides a protective cover 1, which is installed on the gearbox of a lawnmower. The protective cover 1 includes a protective cover body 11 and a locking plate 12. A connecting part 13 is provided between the protective cover body 11 and the locking plate 12. The protective cover body 11 and the locking plate 12 are connected by the connecting part 13 to form a plurality of limiting holes 14. The locking plate 12 is disposed inside the protective cover body 11. The locking plate 12 is provided with a placement hole 120 coaxially arranged with the limiting hole 13, and the placement hole 120 allows a spline shaft to pass through. The locking plate 12 includes a first locking plate part 121 connected to the connecting part 13 and a second locking plate part 122 not connected to the connecting part. The first locking plate part 121 and the second locking plate part 122 are on different horizontal planes. Specifically, the plane where the first locking plate part 121 is located is farther away from the plane where the protective cover surface 110 is located than the plane where the second locking plate part 122 is located, so that it can better fit the part of the gearbox housing that does not have a locking block. The protective cover 11 is provided with a first fixing hole 111, which is used to fix it to the gearbox housing. Compared with the existing protective cover, this application has an additional locking piece 12 and a limiting hole 14, so that a part of the gearbox can be locked into the limiting hole 14. When the retaining spring in the gearbox is missing or damaged, the locking piece 12 can restrict the bearing in the gearbox, preventing the bearing from falling off, thereby avoiding the problem of the output shaft falling off and injuring personnel. In addition, it also prevents some weeds from getting tangled on the output shaft between the gearbox housing and the grass trimmer head housing, which would increase the load on the grass trimmer head, reduce the speed, or even cause the output shaft to jam and damage the machine. Example

[0029] like Figure 3-4As shown, this embodiment also provides a lawnmower gearbox for a lawn mower head, including a gearbox housing 2 and the aforementioned protective cover 1. A protruding locking block 211 is located on the port 21 of the gearbox housing 2, and the locking block 211 is placed within a limiting hole 13, which is fan-shaped. Preferably, the number of locking blocks 211 and limiting holes 13 is the same, and their shapes match each other. The port 21 of the gearbox housing also has a placement groove 212 for placing the connecting part 13, and the placement groove 212 is spaced apart from the locking block 211. The outer periphery of the port 21 of the gearbox housing has a connection area 22 that connects to the protective cover. The connection area 22 has a second fixing hole 221, and the gearbox housing 2 and the protective cover 1 are connected through the second fixing hole 221, the first fixing hole 111, and fasteners 3. Preferably, the connection area 22 is triangular, and the circumcircle of the triangular area is close to the surface of the protective cover 110. Two U-shaped slots 24 are provided at the other end of the gearbox housing 2. The two U-shaped slots 24 are arranged correspondingly to prevent the gearbox housing 2 from breaking. Each of the two openings of the U-shaped slot 24 is provided with a locking part 241, which is locked by fasteners. By providing locking parts 241 on both sides of the gearbox housing 2, the aluminum tube can be locked more securely.

[0030] In some preferred embodiments, the gearbox housing 2 is provided with honeycomb-shaped heat dissipation grooves 23, which can better dissipate heat.

[0031] like Figure 5-6 As shown, the lawnmower gearbox also includes a first bearing 41, a second bearing 42, a third bearing 43, a splined shaft 44, a large gear 45, a small gear 46, an upper pressure plate 47, a lower pressure plate 48, a protective cover 49, a shaft clip 50, a first retaining ring 51, and a second retaining ring 52. The first bearing 41 is connected to the splined shaft 44. One end of the splined shaft 44 is fitted inside the large gear 45. The large gear 45 is connected to the inside of the gearbox housing 2 via the second bearing 42. The other end of the splined shaft 44 passes through the first bearing 41, the protective cover 1, the lower pressure plate 48, the upper pressure plate 47, and the protective cover 49. A protective cover 49 is provided, and an anti-loosening nut 53 is connected to the other side of the protective cover 49. A small gear 46 is connected inside the gearbox housing 1 and corresponds to the large gear 45. A connecting rod on the small gear 46 is sleeved with a third bearing 43. A first retaining ring 51 is fixedly installed in the inner wall of the gearbox housing 2 and below the third bearing 43. A second retaining ring 52 is fixedly installed in the inner wall of the gearbox housing 1 and corresponds to the first bearing 41. One end of the connecting rod on the small gear 46 passes through the third bearing 43 and extends to the other side of the third bearing 43 and is fixedly sleeved with a shaft clip 50.

[0032] Although preferred embodiments of this application have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of this application.

[0033] It should be noted that any technical features not described in detail in this utility model can be implemented by any existing technology.

Claims

1. A lawnmower gear box for a lawnmower head, characterized in that, The gear box body and the protective cover, the clamping block protruding on the port of the gear box body, the clamping block being arranged in the limiting hole, the protective cover including the protective cover body and the locking plate, the connecting part being arranged between the protective cover body and the locking plate, and the plurality of limiting holes being formed by the connection between the protective cover body and the locking plate through the connecting part; The placing groove for placing the connecting part is further arranged on the port of the gear box body, and the placing groove is arranged at intervals with the clamping block; The first bearing, the second bearing, the third bearing, the spline shaft, the large gear, the small gear, the upper pressing plate, the lower pressing plate, the protective cover, the shaft clamp, the first circlip and the second circlip are further included, the first bearing is connected with the spline shaft, one end of the spline shaft is assembled in the interior of the large gear, the large gear is connected in the interior of the gear box body through the second bearing, the other end of the spline shaft sequentially penetrates the first bearing, the protective cover, the lower pressing plate, the upper pressing plate and the protective cover, and extends to the other side of the protective cover and is connected with the lock nut, the protective cover is connected on the port of the gear box body through the inner hexagonal bolt, the small gear is connected in the interior of the gear box body and corresponds to the large gear, the connecting rod of the small gear is sleeved with the third bearing, the first circlip is fixedly assembled in the inner wall of the gear box body and below the third bearing, the second circlip is assembled in the inner wall of the gear box body and corresponds to the first bearing, and one end of the connecting rod of the small gear penetrates the third bearing and is fixedly sleeved with the shaft clamp on the other side of the third bearing.

2. A lawnmower gearbox according to claim 1, characterised in that, Two U-shaped grooves are arranged at the other port of the gear box body.

3. A lawnmower gearbox according to claim 2, wherein, Locking parts are arranged at the two openings of the U-shaped groove, and the locking parts are locked through the fasteners.

4. A lawn mower gear box for a grass cutting head according to claim 1 wherein, The outer circumferential side of the port of the gear box body is provided with a connecting area connected with the protective cover, the second fixing hole is arranged on the connecting area, and the gear box body and the protective cover are connected through the second fixing hole, the first fixing hole and the fastener.

5. A lawn mower gear box of the type defined in claim 1, characterised in that, The gear box body is provided with a honeycomb-shaped heat dissipation groove.

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