THREE POINT HITCH DRAFT SENSING SYSTEM Russian patent published in 2019 - IPC G01L5/13 A01B59/06 A01B63/112 B60D1/14 B60D1/24 B60D1/62 

FIELD: agriculture; machine building.

SUBSTANCE: invention relates to agricultural machine building. Draft sensing system for an agricultural tractor comprises a hitch frame adapted to be attached to a rear frame of an agricultural tractor, left and right draft link supports. Each of the left and right draft link supports couples the corresponding left and right draft link with the corresponding left and right side of the hitch frame. Left and right draft bars have a first portion attached to the corresponding one of the left and right draft link supports, and a second portion, located behind and inside with respect to its first portion. Draft applied by the left and right draft bars to the left and right draft link supports deflects the second portions of the left and right draft bars. Sensor unit includes a housing that is sealed to protect the sensor unit from dirt. Left sensor link extends from the housing through the left seal and is adapted to engage the second portion of the left draft bar. Right sensor link extends from the housing through the right seal and is adapted to engage the second portion of the right draft bar. In the housing there is a measuring transducer of linear displacements and a lever unit, which is connected to the left and right sensor links. Lever unit is configured for mechanical summation of the deflection of the second portions of the left and right draft bars by means of the left and right sensor links, and the application of the summed deflection to the measuring transducer of linear displacements.

EFFECT: compactness and tightness of the measurement system.

10 cl, 9 dwg