Patent ID: 12219897

DETAILED DESCRIPTION

In order to make the objectives, technical solutions, and advantages of the disclosure clearer, the drawings combined with embodiments will be described below in detail.

Referring toFIG.1, the disclosure provides an all-wheel drive self-propelled assembly100for a mower, a lawn mower, and the like. The all-wheel drive self-propelled assembly100includes a front-drive unit10, a rear-drive unit20, and a height adjusting unit30.

Referring toFIG.1andFIG.2, the front-drive unit10includes a front transmission mechanism11, a front-wheel shaft mechanism12, a front gear set13, and front-wheels14(as shown inFIG.5). The front transmission mechanism11includes a front gearbox111, a front output shaft112that cooperates with the front gearbox111, and a motor113that supply powers to the front gearbox111. The motor113may be an electrical machine, a gasoline engine, and the like. The front-wheel shaft mechanism12includes a pair of front shaft plates121that are pivotally mounted on the front output shaft112, a front linkage rod122that connects the pair of front shaft plates121, and a front-wheel shaft123that is mounted on the front shaft plate121and cooperates with the front-wheels14.

The front shaft plate121that is pivotally mounted on the front output shaft112by a bearing (not shown). In the present embodiment, the front shaft plate121is a roughly regular triangle. However, in other embodiments, the front shaft plate121may be configured in other shapes as needed. The front linkage rod122is provided with a front avoidance groove1221that cooperates with the front transmission mechanism11to avoid collision with the front transmission mechanism11when the front linkage rod122rotates. The front gear set13includes a front-drive gear131that is fixedly mounted on the front output shaft112, and a front-driven gear132that is fixedly mounted on one of the front-wheels14and engaged with the front-drive gear131, the front-wheel14that is pivotally mounted on the front-wheel shaft123and co-rotates with the front-driven gear132. When the front-drive unit10is working, the front output shaft112drives the front-drive gear131to rotate, and the front-drive gear131drives the front-driven gear132to rotate so that the front-wheels14are rotated by the front-driven gear132. In the present embodiment, the front-wheel shaft123is not coaxial with the front linkage rod122, but in other embodiments, the front-wheel shaft123and the front linkage rod122can also be disposed of coaxially.

Referring toFIG.1throughFIG.3, the rear-drive unit20includes a rear transmission mechanism21, a rear-wheel shaft mechanism22, a rear-drive gear set23, and rear-wheels24(as shown inFIG.5). The rear transmission mechanism21includes a rear gearbox211, a rear output shaft212that cooperates with the rear gearbox211, and a motor213that supplies powers to the rear gearbox. The motor213may be an electrical machine, a gasoline engine, and the like. The rear-wheel shaft mechanism22includes a pair of rear shaft plates221which are pivotally mounted on the rear output shaft212, a rear linkage rod222that connects the pair of rear shaft plates221, and a rear-wheel shaft223that is mounted on the rear shaft plate221and cooperates with the rear-wheels24.

The rear shaft plate221that is pivotally mounted on the rear output shaft212by a bearing (not shown). The rear linkage rod222is provided with a rear avoidance groove2221that cooperates with the rear transmission mechanism21to avoid collision with the front transmission mechanism21when the rear linkage rod222rotates. The rear-drive gear set23includes a rear-drive gear231that is fixedly mounted on the rear output shaft212, and a rear-driven gear232that is fixedly mounted on one of the rear-wheel24and engaged with the rear-drive gear231. The rear-wheels24are pivotally mounted on the rear-wheel shaft223and co-rotate with the rear-driven gear232. When the rear-drive unit20is working, the rear output shaft212drives the rear-drive gear231to rotate, and the rear-drive gear231drives the rear-driven gear232to rotate so that the rear-wheels24rotate under the effect of the rear-driven gear232. In the present embodiment, the rear-wheel shaft223is not coaxial with the rear linkage rod222, but in other embodiments, the rear-wheel shaft223and the rear linkage rod222can also be disposed of coaxially.

Referring toFIGS.1,3, and5, the height adjusting unit30directly or indirectly controls the rotation of the front shaft plate121and the rear shaft plate221so that the front-wheel shaft123and the rear-wheel shaft223rotate around the front output shaft112and the rear output shaft212respectively, thereby adjusting the distance above the ground of the front output shaft112and the rear output shaft212. The height adjusting unit30includes a transmission rod31, a height adjusting handle32, a height adjusting baffle33, a handle reset elastic element34which cooperates with the height adjusting handle32, and a gear reset elastic element35which cooperates with the transmission rod31. One end of the transmission rod31is pivotally mounted on the front shaft plate121, and the other end of the transmission rod31is pivotally mounted on the rear shaft plate221so that the front shaft plate121and the rear shaft plate221rotate synchronously.

The height adjusting handle32is pivotally mounted on the rear shaft plate221and can rotate around the rear shaft plate221. The height adjusting baffle33is used to cooperate with the height adjusting handle32, and a plurality of gear slots331which cooperate with the height adjusting handle32are disposed on the height adjusting baffle33. In the embodiment, the number of the gear slots331is7, so that the user can finely locate the rotation angle of the height adjusting handle32. One end of the gear reset elastic element35is fixedly mounted on the transmission rod31, and the other end of the gear reset elastic element35is mounted on the housing of the lawn-mower or the push mower. The height adjusting handle32is pushed along an axial of the rear output shaft212such that the height adjusting handle32is disengaged from the gear slots331, at this point, an elastic deformation of the gear reset elastic element34occurs, the user can push the height adjusting handle32to rotate around the rear output shaft212, thereby driving the rear shaft plate221and the front shaft plate121to rotate, thereby driving the rear-wheel shaft223and the front-wheel shaft123to rotate around the rear output shaft212and the front output shaft112respectively, to achieve the purpose of adjusting the distance above the ground of the rear output shaft212and the front output shaft112.

After the height adjustment is completed, the height adjusting handle32is pushed into the gear slots331, at this point, the handle reset elastic element34is restored to the original state. When the distances above the ground of the rear output shaft212and the front output shaft112are adjusted from small to large, an elastic deformation of the gear reset elastic element35occurs under the effect of the transmission rod31; when the distances above the ground of the rear output shaft212and the front output shaft112are adjusted from large to small in the direction of the arrow shown inFIG.6, in another word, the state which is shown inFIG.6is adjusted to the state shown inFIG.8, then the gear reset elastic element35is gradually restored to the original state.

In the present embodiment, the height adjusting handle32is mounted on the rear shaft plate221, but in other embodiments, the height adjusting handle32may also be mounted on the front shaft plate121. In the present embodiment, the height adjusting handle32and the transmission rod31are located on different sides of the front output shaft112and the rear output shaft212, but in other embodiments, the height adjusting handle32and the transmission rod31can also be located on the same side of the front output shaft112and the rear output shaft212. In the present embodiment, when the front shaft plate121and the rear shaft plate221are rotated by the height adjusting unit30, the front shaft plate121and the rear shaft plate221are arranged to rotate along a same direction, but in other embodiments, the front shaft plate121and the rear shaft plate221can also be arranged to rotate along the opposite directions.

FIG.1andFIG.8are the schematic views of the all-wheel drive self-propelled assembly, when the distances above the ground of the front output shaft112and the rear output shaft212are minimum.FIG.4andFIG.6are the schematic views of the all-wheel drive self-propelled assembly when the distances above the ground of the front output shaft112and the rear output shaft212are maxima. As shown inFIG.8, to prevent the front linkage rod122from scraping the ground, the front linkage rod122is arranged so that when the front linkage rod122rotates, a movement trail of the front avoidance groove1221is located above a plane where the front output shaft112and the rear output shaft212are located.

Preferably, the front linkage rod122may also be arranged that when the distance between the front output shaft112and the ground is maxima, the front avoidance groove1221is located below the plane where the front output shaft112and the rear output shaft212are located; when the distance between the front output shaft112and the ground is minimum, the front avoidance groove1221is disposed above the plane where the front output shaft112and the rear output shaft212are located. In this way, the front linkage rod122can be effectively prevented from scraping the ground during height adjustment. The rear linkage rod222is arranged that when the rear linkage rod rotates222, a movement trail of the rear avoidance groove2221is located below the plane where the front output shaft112and the rear output shaft212are located. In this way, the rear linkage rod222can avoid collision with the grass discharging cavity of the mower or the lawn mower.

Compared with the prior art, the all-wheel drive self-propelled assembly100put a movement trail of the front avoidance groove1221at least partly above a plane where the front output shaft112and the rear output shaft212are located, so that the front linkage rod122does not scrape the ground during the height adjustment process, so that the all-wheel drive self-propelled assembly100can adjust the mowing height freely on the premise of maintaining the lowest mowing height of an existing mower, so that the defect that an existing height adjusting mechanism scrapes the ground is avoided.

Referring toFIG.5, the present disclosure also discloses a mower200includes the all-wheel drive self-propelled assembly100, a housing201which is pivotally mounted on the all-wheel drive self-propelled assembly100, and a cutting assembly (not shown). The housing201is pivotally mounted on the front output shaft112and the rear output shaft212by bearings. The cutting assembly is mounted on the housing201.

In conclusion, the all-wheel drive self-walking assembly100put a movement trail of the front avoidance groove1221at least partly above a plane where the front output shaft112and the rear output shaft212are located, so that the front linkage rod122does not scrape the ground during the height adjustment process, thereby the all-wheel drive self-propelled assembly100can adjust the mowing height freely on the premise of maintaining the lowest mowing height of an existing mower, so that the defect that an existing height adjusting mechanism scrapes the ground is avoided.

While the disclosure has been described in detail regarding preferred embodiments, those skilled in the art can easily understand other advantages and effects of the disclosure from the content disclosed in this specification. The disclosure can be implemented or applied through other different specific embodiments, and various details in the specification can be modified or changed based on different viewpoints and applications without departing from the spirit of the disclosure.