| 摘要 |
A driveshaft assembly including a driveshaft having a first recess proximate a first end, and a second recess proximate a second end. The assembly also includes a first key within the first recess, a second key within the second recess, a first end housing, and a second end housing. The assembly further includes a first thrust bearing seat coaxially disposed within a first receptacle of the first end housing and including a first end, a second end, and a first length L1 measured axially between the second end and the first end, and a second thrust bearing seat coaxially disposed within a second receptacle of the second end housing and including a first end, a second end, and a second length L2 measured axially between the second end and the first end. L1 and L2 are both fixed and L2 is greater than L1. |
| 主权项 |
1. A driveshaft assembly for a downhole motor, the driveshaft assembly comprising:
a driveshaft having a central longitudinal axis, a first end, a second end opposite the first end, a first recess proximate the first end, and a second recess proximate the second end; a first drive key configured to be at least partially disposed within the first recess; a second drive key configured to be at least partially disposed within the second recess; a first end housing having a central axis, a first end, a second end opposite the first end, and a first receptacle extending axially from an open end to a closed end, wherein the open end is proximate the first end of the first end housing and wherein the first receptacle includes a first pocket having an inner wall; and a second end housing having a central axis, a first end, a second end opposite the first end, and a second receptacle extending axially from an open end to a closed end, wherein the open end is proximate the first end of the second end housing and wherein the second receptacle includes a second pocket having an inner wall; a central point disposed along the central longitudinal axis of the driveshaft and substantially equidistant from the closed end of the first receptacle and the closed end of the second receptacle along the central longitudinal axis of the driveshaft; a first thrust bearing seat having a central axis, a first end, a second end opposite the first end, and a first central length L1 measured axially along the central axis of the first thrust bearing seat from the first end of the first thrust bearing seat to the second end of the first thrust bearing seat; and a second thrust bearing seat having a central axis, a first end, a second end opposite the first end, and a second central length L2 measured axially along the central axis of the second thrust bearing seat from the first end of the second thrust bearing seat to the second end of the second thrust bearing seat; wherein L1 and L2 are both fixed and wherein L2 is greater than L1; wherein the driveshaft assembly has a first configuration, wherein:
the first end of the driveshaft is disposed within the first receptacle such that the first drive key engages the inner wall of the first pocket at a first contact point that is spaced from the central point at a distance H1 along the central longitudinal axis of the driveshaftthe second end of the driveshaft is disposed within the second receptacle such that the second drive key engages the inner wall of the second pocket at a second contact point that is spaced from the central point at a distance H2 along the central longitudinal axis of the driveshaft, wherein H1 is greater than H2;the first thrust bearing seat is disposed within the first receptacle such that the central axis of the first thrust bearing seat is coaxially aligned with the central axis of the first end housing; andthe second thrust bearing seat is disposed within the second receptacle such that the central axis of the second thrust bearing seat is coaxially aligned with the central axis of the second end housing. |
