Patent ID: 8863602
Filing Date: 2014-10-21
Classification: F16H,Y10T

Abstract:
1. An oilfield pumping unit two-stage transmission gear reducer comprising: a. a low speed stage comprising: a low speed shaft configured to receive motion from an intermediate shaft; b. a first gear pair including a low speed shaft double circular arc gear mounted on the low speed shaft and configured to be driven by an intermediate speed shaft double circular arc gear mounted on the intermediate shaft wherein the intermediate speed shaft double circular arc gear is approximately 0.15-15% greater in diameter than the intermediate shaft; and c. a high speed stage comprising: a high speed shaft configured to receive motion from the intermediate shaft; d. a second gear pair including a high speed shaft involute gear mounted on the high-speed shaft and configured to be driving an intermediate shaft involute gear mounted on the intermediate shaft wherein the high speed shaft involute gear is approximately 0.15-15% greater in diameter than the high speed shaft.