公开(公告)号：US11492779B2

公开(公告)日：2022-11-08

申请号：US16419218

申请日：2019-05-22

Applicant: Caterpillar Inc.

Inventor： Nathaniel K. Harshman ,  Akilan Appavu ,  Anand Kesheorey

IPC: E02F3/84 ,  E02F3/76

Abstract: A grading machine includes a machine body, a grading blade supported by a circle, a drawbar connecting the grading blade and the circle to the machine body, and a circle drive system including a circle drive motor and a gear box. The gear box is configured to engage with and rotate the circle relative to the drawbar around a circle axis. The gear box includes a first gear that rotates about a first axis of rotation that is parallel to the circle axis, and the gear box also includes a second gear that rotates about a second axis that is parallel to the circle axis and spaced away from the first axis of rotation.

公开(公告)号：US12180787B1

公开(公告)日：2024-12-31

申请号：US18227718

申请日：2023-07-28

Applicant: Caterpillar Inc.

Inventor： Swetha Suresh ,  Ebi Bernard ,  Tamilmurasu Annadurai ,  Akilan Appavu

IPC: E21B10/22

Abstract: A leg assembly of a tricone bit includes a cone and a leg fitting inside the cone. The leg includes an axis defining an axial center of rotation of the cone, a first raceway for a first row of bearings, a second raceway for a second row of bearings, and a third raceway for a third row of bearings disposed between the cone and the leg, at a distal end, at a middle section, and at a proximal end of the leg. A first clearance for the first row of bearings for the first raceway is less than a second clearance for the second row of bearings for the second raceway, which is less than a third clearance for the third row of bearings for the third raceway, such that the first row of bearings initially supports most of the radial load applied to the tricone bit.