Fixed coaxial shaft for a hydraulic unit

Abstract

A fixed coaxial shaft of a hydraulic unit is provided including a body having a first end and a second opposite end. A plurality of first splines is formed in an exterior surface of the body adjacent the first end and a plurality of second splines is formed in the exterior surface of the body adjacent the second end. The plurality of first splines and the plurality of second splines are substantially identical. The body of the shaft has an outer diameter of about 0.640±0.0005 inches (1.626±0.0013 centimeters), an inner diameter of about 0.517±0.010 inches (1.313±0.0254 centimeters), and an overall length of about 2.678±0.005 inches (6.802±0.0127 centimeters).

What is claimed is: 
     
         1 . A fixed coaxial shaft of a hydraulic unit, comprising:
 a body having a first end and a second opposite end and a plurality of first splines formed in an exterior surface of the body adjacent the first end and a plurality of second splines formed in the exterior surface of the body adjacent the second end, the plurality of first splines and the plurality of second splines being substantially identical, wherein the body has an outer diameter of about 0.640±0.0005 inches (1.626±0.0013 centimeters), and inner diameter of about 0.517±0.010 inches (1.313±0.0254 centimeters), and an overall length between the first end and the second end of about 2.678±0.005 inches (6.802±0.0127 centimeters).   
     
     
         2 . The fixed coaxial shaft according to  claim 1 , wherein an interface between the plurality of first splines and the exterior surface of the body and an the interface between the plurality of second splines and the exterior surface of the body has a radius of about 0.030±0.010 inches (0.076±0.0254 centimeters). 
     
     
         3 . The fixed coaxial shaft according to  claim 1 , wherein a first end of the plurality of first splines and a first end of the plurality of second splines are spaced away from the first end and the second end of the body, respectively, by a distance of about 0.145±0.005 inches (0.368±0.0013 centimeters). 
     
     
         4 . The fixed coaxial shaft according to  claim 2 , wherein a chamfer is formed in the first end of the plurality of first splines and the first end of the plurality of second splines, the chamfer having a width parallel to a longitudinal axis of the shaft or about 0.018±0.010 inches (0.046±0.0254 centimeters) and extends at an angle of about 45°±5°. 
     
     
         5 . The fixed coaxial shaft according to  claim 2 , wherein a second end of the plurality of first splines and a second end of the plurality of second splines are spaced away from the first end and the second end of the body, respectively, by a distance of about 0.575±0.010 inches (1.46±0.0254 centimeters). 
     
     
         6 . The fixed coaxial shaft according to  claim 1 , wherein a midpoint of the plurality of first splines and a midpoint of the plurality of second splines are spaced away from the first end and the second end of the body, respectively, by a distance of about 0.360±0.030 inches (0.914±0.076 centimeters). 
     
     
         7 . The fixed coaxial shaft according to  claim 1 , wherein the plurality of first splines and the plurality of second splines are constructed in accordance with Table 1. 
     
     
         8 . The fixed coaxial shaft according to  claim 1 , wherein a periphery of the first splines and the second splines includes a radius, such that a horizontal distance between a midpoint and a first point on the periphery is about 0.200 inches (0.508 centimeters) and a vertical distance between the midpoint and the first point is about 0.0020±0.0005 inches (0.005±0.001 centimeters). 
     
     
         9 . The fixed coaxial shaft according to  claim 8 , wherein a second point is arranged on the periphery of the first splines and second splines between the midpoint and the first point, wherein a horizontal distance between a midpoint and a second point is about 0.100 inches (0.0254 centimeters) and a vertical distance between the midpoint and the first point is about 0.0005±0.0003 inches (0.001±0.00076 centimeters). 
     
     
         10 . The fixed coaxial shaft according to  claim 1 , wherein a chamfer is formed in the first end of the body, the chamfer extending outwardly at about 60° such that an inner diameter at the first end of the body is about 0.580±0.010 inches (1.473±0.0254 centimeters). 
     
     
         11 . The fixed coaxial shaft according to  claim 1 , wherein a substantially identical chamfer is formed at the second end of the body.