Abstract
In order to assure the quality of the bent axis design axial piston pumps driven by tapered pistons, it is necessary to know the characteristics of force applied to tapered pistons and the mechanism for driving the tapered pistons. Since they are able to perform both reciprocating and spinning motions in cylinder block, it is difficult to understand the driving mechanismand-tomeasure the forces applied to tapered pistons experimentally. In the presem study, the theoretical mechanism for driving the tapered pistons is studied by use of the geometric method. The driving area of tile tapered pistons is measured by measuring the strain of a cylinder forced against a tapered piston using an electric strain gauge and a slip ring. The forces applied to tapered pistons is also investigated with the change of discharge wessure and the rotational speed As a results of this investigation, it is concluded that the cylinder block is driven by one tapered piston in a limited area and flue driving area is changed due to space angle of the tapered pistons and the swivel angle of the cylinder block. It is also observed that the force applied to tapered pistons increases as the discharge pressure and the rotational speed increase.
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Abbreviations
- L :
-
Length of tapered piston
- R d :
-
Pitch circle radius of disk
- R c :
-
Pitch circle radius of cylinder block
- Rdc :
-
Distance between center of cylinder block and center of spherical bearing
- α:
-
Swivel angle of cylinder block
- βo :
-
Tilting angle of tapered piston
- δo :
-
Ahead delay angle of spherical bearing in tapered piston
- o’:
-
Ahead delay angle in universal joint driving
- δx :
-
Clearance angle between tapered piston and cylinder
- θ:
-
Rotational angle from BDC
- ξ:
-
Taper angle of tapered piston
- ϕ:
-
Direction angle of tapered piston
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Kim, JK., Jung, JY. Driving mechanism of tapered pistons in bent-axis design axial piston pumps. KSME International Journal 17, 181–186 (2003). https://doi.org/10.1007/BF02984388
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DOI: https://doi.org/10.1007/BF02984388