A hand-held grass trimmer

Abstract

The utility model discloses a handheld grass beater, including the casing and be located in the motor assembly, support bearing and output shaft of casing, still include the grass head subassembly of being located below the casing, the upper end of output shaft is connected with the casing rotation through support bearing, and the lower end of output shaft projects the casing and links to each other with grass head subassembly, and the output shaft is driven under the drive of motor assembly, and drives grass head subassembly to rotate, and still be equipped with the damping sleeve in the casing, and the damping sleeve is equipped with in the outside of support bearing, and support bearing is through the damping sleeve and the casing and abuts. The utility model forms the separation between the casing and support bearing through the damping sleeve, and the vibration of grass head subassembly high -speed rotation can be absorbed by the damping sleeve after being transmitted to support bearing by output shaft, and the vibration of support bearing transmission to casing is reduced greatly, and then the vibration of main handle and auxiliary handle connected with casing through tubular structure and the noise of grass beater whole are reduced greatly, and the use experience of user is promoted.

Description

Technical Field

[0001] This utility model belongs to the field of landscaping equipment, specifically relating to a handheld lawn mower. Background Technology

[0002] A lawn mower is a handheld lawn trimming tool that typically includes a housing, a motor, an output shaft, and a trimming head assembly. A tubular structure is connected to the housing, and the tubular structure has a main handle and an auxiliary handle for the user to hold with both hands. The user holds the main handle and the auxiliary handle to move the housing through the tubular structure, thereby controlling the movement of the lawn mower. The motor drives the trimming head assembly to rotate through the output shaft to perform the weeding operation.

[0003] Currently, existing hay trimmer assemblies are assembled from multiple parts. Due to unavoidable errors in parts, assembly, and uneven internal weight, dynamic balance fluctuations occur when the hay trimmer assemblies rotate at high speeds, causing continuous vibration. Because the output shaft connected to the hay trimmer assembly is rotatably connected to the housing via bearings, the vibration is transmitted to the housing through the output shaft and bearings, and finally to the main and auxiliary handles through a tubular structure. Prolonged vibration of the main and auxiliary handles causes continuous muscle tension and nerve stress in the user, leading to fatigue, reduced work efficiency, and compromised safety. Furthermore, the loud noise generated by the vibration can negatively impact the user's health, resulting in a poor user experience. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide a handheld lawn mower to solve the problem of obvious vibration when users use the lawn mower to cut grass.

[0005] To solve the above-mentioned technical problems, this utility model adopts the following technical solution: A handheld lawn mower includes a housing and a motor assembly, a support bearing, and an output shaft disposed within the housing. It also includes a mowing head assembly disposed below the housing. The upper end of the output shaft is rotatably connected to the housing via the support bearing, and the lower end of the output shaft extends out of the housing and is connected to the mowing head assembly. Driven by the motor assembly, the output shaft drives the mowing head assembly to rotate. A shock-absorbing sleeve is also provided inside the housing, fitted onto the outside of the support bearing, which abuts against the housing through the shock-absorbing sleeve. This technical solution has the following technical effects:

[0006] This invention incorporates a shock-absorbing sleeve within the machine housing, which is then fitted over the outer side of the support bearing. This creates a separation between the housing and the support bearing, transforming the rigid contact between them into a soft contact. This allows the vibrations generated by the high-speed rotation of the mowing head assembly to be largely absorbed by the sleeve after being transmitted from the output shaft to the support bearing. This significantly reduces the vibration transmitted from the support bearing to the housing, thereby greatly minimizing the vibration of the main and auxiliary handles connected to the housing via the tubular structure, as well as the overall noise of the mowing machine. This reduces user fatigue, ensures user safety, and enhances the user experience.

[0007] In the aforementioned handheld lawn mower, the housing includes a casing and an annular mounting seat disposed within the casing. The annular mounting seat has a mounting groove, and a support bearing is embedded in the mounting groove to clamp the shock-absorbing sleeve together with the annular mounting seat. The mounting groove can radially limit the support bearing, thereby radially limiting the output shaft through the support bearing, ensuring that the output shaft and the motor shaft of the motor assembly can remain connected and guarantee their linkage. At the same time, the mounting groove can increase the contact area between the housing and the shock-absorbing sleeve, resulting in better support for the shock-absorbing sleeve.

[0008] In the aforementioned handheld lawn mower, a limiting boss is provided on the output shaft, and the support bearing has an inner ring and an outer ring that are rotatably connected. The limiting boss abuts against the end face of the inner ring to prevent the support bearing from dislodging from the mounting groove. While rotating together with the inner ring, the limiting boss of the output shaft axially limits the support bearing, ensuring that the support bearing remains stably within the mounting groove. This, in turn, ensures that the shock-absorbing sleeve is always clamped between the support bearing and the annular mounting seat for vibration damping.

[0009] In the aforementioned handheld lawn mower, the shock-absorbing sleeve includes an integrally formed first shock-absorbing part and a second shock-absorbing part. The first shock-absorbing part is clamped between the outer wall of the outer ring and the inner wall of the mounting groove, and the second shock-absorbing part is clamped between the end face of the outer ring away from the limiting boss and the inner bottom wall of the mounting groove. By configuring the shock-absorbing sleeve with a structure combining the first and second shock-absorbing parts, the first shock-absorbing part can isolate and absorb vibration between the outer peripheral surface of the outer ring and the inner wall of the mounting groove, and the second shock-absorbing part can isolate and absorb vibration between the end face of the outer ring and the inner bottom wall of the mounting groove, preventing vibration from being directly transmitted to the machine casing through the outer peripheral surface or end face of the outer ring, resulting in good shock absorption.

[0010] In the aforementioned handheld lawn mower, a gear assembly is also provided inside the casing. The gear assembly includes a driving gear connected to the motor shaft of the motor assembly and a driven gear connected to the output shaft. The driving gear and driven gear mesh to transmit power between the motor shaft and the output shaft. The support bearings include an upper support bearing located above the driven gear and a lower support bearing located below the driven gear. The upper support bearing is sleeved on the output shaft above the driven gear, and the lower support bearing is sleeved on the output shaft below the driven gear, to radially limit the position of the driven gear on the output shaft, ensuring that the driven gear always meshes with the driving gear and guaranteeing stable transmission between the motor assembly and the output shaft.

[0011] In the aforementioned handheld lawn mower, the shock-absorbing sleeve includes an upper shock-absorbing sleeve and a lower shock-absorbing sleeve. The upper shock-absorbing sleeve is fitted onto the outside of the upper support bearing, and the lower shock-absorbing sleeve is fitted onto the outside of the lower support bearing. Through the cooperation of the upper and lower shock-absorbing sleeves, the two support bearings on the upper and lower sides of the driven gear can be simultaneously damped, maximizing the separation between the support bearings and the machine housing, and improving the shock absorption effect.

[0012] In the aforementioned handheld lawn mower, the shock-absorbing sleeve is fitted on the outside of the lower support bearing to greatly reduce the vibration transmitted from the lower support bearing to the machine housing; or, the shock-absorbing sleeve is fitted on the outside of the upper support bearing to greatly reduce the vibration transmitted from the upper support bearing to the machine housing.

[0013] In the aforementioned handheld lawn mower, the shock-absorbing sleeve is made of one of the following materials: nitrile rubber, fluororubber, butyl rubber, silicone rubber, natural rubber, or polyurethane. This allows the shock-absorbing sleeve to absorb vibrations through slight deformation and recovery, without affecting the transmission between the output shaft and the motor assembly due to excessive deformation, thus ensuring stable transmission between the two.

[0014] The features and advantages of this utility model will be disclosed in detail in the following specific embodiments and accompanying drawings. Attached Figure Description

[0015] The present invention will be further described below with reference to the accompanying drawings and specific embodiments:

[0016] Figure 1 This is a cross-sectional view of a handheld lawn mower according to the present invention.

[0017] Figure 2 This is a partial exploded view of a handheld lawn mower according to the present invention;

[0018] Figure 3 This is a schematic diagram of the assembly of the supporting bearing and the shock absorber.

[0019] Figure label:

[0020] 100. Housing; 110. Shell; 120. Annular mounting base; 121. Mounting slot;

[0021] 200. Motor assembly; 210. Motor shaft;

[0022] 300, Support bearing; 310, Inner ring; 320, Outer ring; 330, Upper support bearing; 340, Lower support bearing;

[0023] 400. Output shaft; 410. Limiting boss;

[0024] 500, Shock-absorbing sleeve; 510, First shock-absorbing part; 520, Second shock-absorbing part; 530, Upper shock-absorbing sleeve; 540, Lower shock-absorbing sleeve;

[0025] 600. Gear assembly; 610. Driving gear; 620. Driven gear;

[0026] 700. Grass trimming head assembly. Detailed Implementation

[0027] This utility model proposes a handheld grass trimmer, including a housing and a motor assembly, a support bearing, and an output shaft disposed within the housing. It also includes a grass trimming head assembly disposed below the housing. The upper end of the output shaft is rotatably connected to the housing via the support bearing, and the lower end of the output shaft extends out of the housing and is connected to the grass trimming head assembly. Driven by the motor assembly, the output shaft drives the grass trimming head assembly to rotate. A shock-absorbing sleeve is also provided inside the housing, which is fitted on the outside of the support bearing, and the support bearing abuts against the housing through the shock-absorbing sleeve. This invention incorporates a shock-absorbing sleeve within the machine housing, which is then fitted over the outer side of the support bearing. This creates a separation between the housing and the support bearing, transforming the rigid contact between them into a soft contact. This allows the vibrations generated by the high-speed rotation of the mowing head assembly to be largely absorbed by the sleeve after being transmitted from the output shaft to the support bearing. This significantly reduces the vibration transmitted from the support bearing to the housing, thereby greatly minimizing the vibration of the main and auxiliary handles connected to the housing via the tubular structure, as well as the overall noise of the mowing machine. This reduces user fatigue, ensures user safety, and enhances the user experience.

[0028] The technical solutions of the present utility model will be explained and described below with reference to the accompanying drawings. However, the following embodiments are only preferred embodiments of the present utility model and not all of them. Other embodiments obtained by those skilled in the art based on the embodiments in the implementation methods without creative effort are all within the protection scope of the present utility model.

[0029] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "clockwise", "counterclockwise", 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 utility model 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 limitations on this utility model.

[0030] Furthermore, the terms "first" and "second" 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. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more, unless otherwise expressly defined.

[0031] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., 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 mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of 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.

[0032] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature 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 includes the first feature 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.

[0033] Example 1:

[0034] A handheld lawn mower, such as Figures 1 to 3As shown, the device includes a housing 100, on which a tubular structure is connected. A main handle and an auxiliary handle for the user to grip are mounted on the tubular structure. Inside the housing 100 are a motor assembly 200, a support bearing 300, and an output shaft 400. Below the housing 100 is a grass-trimming head assembly 700. The output shaft 400 extends longitudinally within the housing 100. The support bearing 300 is installed inside the housing 100 and sleeved on the upper end of the output shaft 400, allowing the output shaft 400 to connect with... The housing 100 is rotatably connected, and a shock-absorbing sleeve 500 is provided inside the housing 100. The shock-absorbing sleeve 500 is fitted onto the outside of the support bearing 300, and the support bearing 300 abuts against the housing 100 through the shock-absorbing sleeve 500, so that the shock-absorbing sleeve 500 can form a separation between the housing 100 and the support bearing 300. The motor assembly 200 is connected to the upper end of the output shaft 400 to drive the output shaft 400 to rotate. The lower end of the output shaft 400 extends out of the housing 100 and is connected to the weed trimming head assembly 700. When the motor assembly 200 is working, the output shaft 400, driven by the motor assembly 200, drives the weed trimming head assembly 700 to rotate for weeding.

[0035] This invention incorporates a shock-absorbing sleeve 500 within the housing 100 and places it around the support bearing 300. This creates a separation between the housing 100 and the support bearing 300, transforming the rigid contact between them into a soft contact. This allows the vibrations generated by the high-speed rotating mowing head assembly 700, transmitted from the output shaft 400 to the support bearing 300, to be largely absorbed by the shock-absorbing sleeve 500. This significantly reduces the vibrations transmitted from the support bearing 300 to the housing 100, thereby greatly reducing the vibrations of the main handle and auxiliary handle connected to the housing 100 via the tubular structure, as well as the overall noise of the mowing machine. This reduces user fatigue due to vibration, ensures user safety, and enhances the user experience.

[0036] like Figure 1 As shown, in this embodiment, the housing 100 includes a shell 110 and an annular mounting seat 120 disposed within the shell 110. The annular mounting seat 120 has a mounting groove 121. The output shaft 400 passes through the annular mounting seat 120, and the support bearing 300 is embedded in the mounting groove 121. The shock-absorbing sleeve 500 is clamped between the support bearing 300 and the annular mounting seat 120. The mounting groove 121 provides radial limitation for the support bearing 300, thereby radially limiting the output shaft 400. This ensures that the output shaft 400 and the motor shaft 210 of the motor assembly 200 remain connected, guaranteeing their linkage. Simultaneously, the mounting groove 121 increases the contact area between the housing 100 and the shock-absorbing sleeve 500, resulting in better support for the shock-absorbing sleeve 500.

[0037] The support bearing 300 has an inner ring 310 and an outer ring 320, which are rotatably connected. To prevent the support bearing 300 from freely coming out of the mounting groove 121, this embodiment provides a limiting boss 410 on the output shaft 400. The limiting boss 410 abuts against the end face of the inner ring 310. While the limiting boss 410 of the output shaft 400 rotates together with the inner ring 310, it limits the support bearing 300 axially, ensuring that the support bearing 300 is always stably in the mounting groove 121, thereby ensuring that the damping sleeve 500 is always clamped between the support bearing 300 and the annular mounting seat 120 for damping.

[0038] like Figure 3 As shown, in this embodiment, the shock-absorbing sleeve 500 is an integral structure, including a first shock-absorbing part 510 and a second shock-absorbing part 520. The outer side wall of the outer ring 320 and the inner side wall of the mounting groove 121 jointly clamp the first shock-absorbing part 510, and the end face of the outer ring 320 away from the limiting boss 410 and the inner bottom wall of the mounting groove 121 jointly clamp the second shock-absorbing part 520. By setting the shock-absorbing sleeve 500 into a structure combining the first shock-absorbing part 510 and the second shock-absorbing part 520, the first shock-absorbing part 510 can separate and absorb vibration between the outer peripheral surface of the outer ring 320 and the inner side wall of the mounting groove 121, and the second shock-absorbing part 520 can separate and absorb vibration between the end face of the outer ring 320 and the inner bottom wall of the mounting groove 121, preventing vibration from being directly transmitted to the housing 100 through the outer peripheral surface or end face of the outer ring 320, resulting in good shock absorption effect.

[0039] In this embodiment, a gear assembly 600 is also provided inside the housing 100. The gear assembly 600 includes a driving gear 610 and a driven gear 620. The driving gear 610 is connected to and rotates with the motor shaft 210 of the motor assembly 200. The driven gear 620 is connected to and rotates with the output shaft 400. The driving gear 610 and the driven gear 620 mesh to transmit power between the motor shaft 210 and the output shaft 400. When the motor shaft 210 of the motor assembly 200 rotates, the driving gear 610 rotates with the motor shaft 210, thereby driving the driven gear 620 meshing with it to rotate, and in turn driving the output shaft 400 to rotate. The gear assembly 600 can not only realize the transmission between the motor shaft 210 and the output shaft 400, but also change the transmission speed by changing the diameter ratio of the driving gear 610 and the driven gear 620. For example, by setting the diameter of the driving gear 610 to be smaller than that of the driven gear 620, speed reduction can be achieved.

[0040] In this embodiment, the support bearing 300 includes an upper support bearing 330 and a lower support bearing 340. The upper support bearing 330 is sleeved on the output shaft 400 above the driven gear 620, and the lower support bearing 340 is sleeved on the output shaft 400 below the driven gear 620. This radially limits the position of the driven gear 620 on the output shaft 400, ensuring that the driven gear 620 always meshes with the driving gear 610, thus guaranteeing stable transmission between the motor assembly 200 and the output shaft 400. Two limiting bosses 410 are provided, which are used to axially limit the two support bearings 300 on the upper and lower sides of the driven gear 620, respectively.

[0041] like Figure 2 As shown, in this embodiment, the damping sleeve 500 includes an upper damping sleeve 530 and a lower damping sleeve 540. The upper damping sleeve 530 is fitted onto the outside of the upper support bearing 330, which can separate the upper support bearing 330 from the housing 100, thereby greatly reducing the vibration transmitted from the upper support bearing 330 to the housing 100. The lower damping sleeve 540 is fitted onto the outside of the lower support bearing 340, which can separate the lower support bearing 340 from the housing 100, thereby greatly reducing the vibration transmitted from the lower support bearing 340 to the housing 100. Through the cooperation of the upper damping sleeve 530 and the lower damping sleeve 540, the two support bearings 300 on the upper and lower sides of the driven gear can be damped simultaneously, maximizing the separation between the support bearings 300 and the housing 100 and improving the damping effect. In another embodiment, the damping sleeve may only be fitted onto the outside of the lower support bearing, or only onto the outside of the upper support bearing. Of course, it is understandable that because the lower support bearing is closer to the grass trimming head assembly, the vibration of the lower support bearing is more intense than that of the upper support bearing. Therefore, it is more effective to put the shock-absorbing sleeve on the outside of the lower support bearing than to put the shock-absorbing sleeve on the outside of the upper support bearing.

[0042] In this embodiment, the shock-absorbing sleeve 500 is made of a material with a certain degree of elasticity. Preferably, the material of the shock-absorbing sleeve 500 is one of nitrile rubber, fluororubber, butyl rubber, silicone rubber, natural rubber, or polyurethane. This allows the shock-absorbing sleeve 500 to absorb vibrations through slight deformation and recovery, without affecting the meshing of the driven gear 620 on the output shaft 400 and the driving gear 610 on the motor shaft 210 due to excessive deformation, thus ensuring stable transmission between the two. In actual manufacturing, the choice can be made based on factors such as the usage environment and cost. For example, when the ambient temperature of the handheld lawnmower is high, fluororubber can be used to make the shock-absorbing sleeve 500, so that the shock-absorbing sleeve 500 has better shock absorption performance and is more resistant to high temperatures, thus extending the service life of the shock-absorbing sleeve 500.

[0043] The above description is merely a preferred embodiment of this utility model. The protection scope of this utility model is not limited to the above embodiments. All technical solutions falling within the scope of this utility model's concept are protected. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of this utility model should also be considered within the protection scope of this utility model.

Claims

1. A hand-held grass trimmer comprising a housing (100), a motor assembly (200), a support bearing (300) and an output shaft (400) arranged in the housing (100), and a grass trimming head assembly (700) arranged below the housing (100), the upper end of the output shaft (400) being rotatably connected to the housing (100) via the support bearing (300), the lower end of the output shaft (400) extending out of the housing (100) and being connected to the grass trimming head assembly (700), the output shaft (400) being driven by the motor assembly (200) to rotate the grass trimming head assembly (700), characterized in that: The housing (100) is also provided with a shock-absorbing sleeve (500), which is sleeved on the outside of the support bearing (300). The support bearing (300) abuts against the housing (100) through the shock-absorbing sleeve (500).

2. A hand-held grass trimmer according to claim 1, characterized in that: The housing (100) includes a housing (110) and an annular mounting seat (120) disposed within the housing (110). The annular mounting seat (120) is provided with a mounting groove (121). The support bearing (300) is embedded in the mounting groove (121) to clamp the shock-absorbing sleeve (500) together with the annular mounting seat (120).

3. A hand-held grass trimmer according to claim 2, characterized in that: The output shaft (400) is provided with a limiting boss (410), and the support bearing (300) has an inner ring (310) and an outer ring (320) that are rotatably connected. The limiting boss (410) abuts against the end face of the inner ring (310) to prevent the support bearing (300) from coming out of the mounting groove (121).

4. A hand-held grass trimmer according to claim 3, characterized in that: The shock-absorbing sleeve (500) includes an integrally formed first shock-absorbing part (510) and a second shock-absorbing part (520). The first shock-absorbing part (510) is clamped between the outer side wall of the outer ring (320) and the inner side wall of the mounting groove (121). The second shock-absorbing part (520) is clamped between the end face of the outer ring (320) away from the limiting boss (410) and the inner bottom wall of the mounting groove (121).

5. A hand-held grass trimmer according to claim 1, characterized in that: The housing (100) is further provided with a gear assembly (600), which includes a drive gear (610) connected to the motor shaft (210) of the motor assembly (200) and a driven gear (620) connected to the output shaft (400). The drive gear (610) meshes with the driven gear (620) to transmit power between the motor shaft (210) and the output shaft (400). The support bearing (300) includes an upper support bearing (330) located above the driven gear (620) and a lower support bearing (340) located below the driven gear (620).

6. A hand-held grass trimmer according to claim 5, characterized in that: The shock-absorbing sleeve (500) includes an upper shock-absorbing sleeve (530) and a lower shock-absorbing sleeve (540). The upper shock-absorbing sleeve (530) is sleeved on the outside of the upper support bearing (330), and the lower shock-absorbing sleeve (540) is sleeved on the outside of the lower support bearing (340).

7. A hand-held grass trimmer according to claim 5, characterized in that: The shock-absorbing sleeve (500) is sleeved on the outside of the lower support bearing (340); or, the shock-absorbing sleeve (500) is sleeved on the outside of the upper support bearing (330).

8. A hand-held grass trimmer according to claim 1, characterized in that: The shock-absorbing sleeve (500) is made of one of the following materials: nitrile rubber, fluororubber, butyl rubber, silicone rubber, natural rubber, or polyurethane.

Images