Kubota has been granted a patent for a travel power transmission apparatus for a tractor. The invention aims to increase the deceleration ratio during creep speed changes while minimizing the size of the transmission case. The apparatus includes various power transmission gears and deceleration gears that transmit power from the relay shaft to the output shaft. The gear transmission also features an output shaft gear that can switch between power transmission ON and OFF states. GlobalData’s report on Kubota gives a 360-degree view of the company including its patenting strategy. Buy the report here.
According to GlobalData’s company profile on Kubota, Autonomous harvesters was a key innovation area identified from patents. Kubota's grant share as of September 2023 was 21%. Grant share is based on the ratio of number of grants to total number of patents.
Travel power transmission apparatus for a tractor with creep speed changing
A recently granted patent (Publication Number: US11773950B2) describes a travel power transmission apparatus for a tractor. The apparatus includes a gear transmission that receives power from an engine and changes its speed before outputting it. A creep speed changing apparatus is also included, which decelerates the power from the gear transmission and outputs it to a differential mechanism for the rear wheel. These components are housed in a transmission case.
The gear transmission consists of an output shaft that transmits power to the differential mechanism and an output shaft gear that can be switched between a power transmission ON state and a power transmission OFF state. In the ON state, the output shaft gear engages with the output shaft and transmits power, while in the OFF state, it disengages from the output shaft, disconnecting power transmission.
The creep speed changing apparatus includes a relay shaft parallel to the output shaft. It also includes a series of power transmission gears and deceleration gears that rotate at lower speeds than the power transmission gears. These gears are supported by the relay shaft and the output shaft, and they can be switched between a power transmission ON state and a power transmission OFF state. In the ON state, they decelerate power from the relay shaft and transmit it to the output shaft.
The patent also describes additional features, such as the positioning of the relay shaft below the output shaft and the inclusion of a clutch that controls the power transmission gears. Furthermore, the apparatus includes a forward/rearward travel switching apparatus and a high/low speed switching apparatus.
Overall, this patent presents a travel power transmission apparatus for a tractor that allows for efficient power transmission and speed control. The inclusion of various gears and the ability to switch between power transmission states provide versatility and adaptability to different operating conditions. This technology has the potential to enhance the performance and functionality of tractors in various agricultural and industrial applications.