Hydraulic radial piston engine
AssigneeBosch Rexroth AG
InventorChris Shrive
Life of this patent
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Abstract
A hydraulic radial piston engine has a lifting ring fixed to the casting, a rotor mounted opposite the lifting ring such that it is rotatable about an axis of rotation, multiple piston seats aligned radially in the rotor relative to the axis of rotation, and multiple pistons each displaceably mounted in a piston seat and which, over at least part of their length, have a non-circular guiding and sealing cross section that is coincident with a non-circular guiding and sealing cross section of the piston seats. Circularly cylindrical rollers are borne by the piston. With a given overall size, a greater swept volume per piston is possible and therefore a greater torque is produceable.
Claims9
A hydraulic radial piston engine comprising:
- a multi-stroke lifting ring (15) which is fixed to a casing,
- a rotor (18) which is mounted opposite the lifting ring (15) such that it is rotatable about an axis of rotation (19) and has multiple piston seats (35) aligned radially with respect to the axis of rotation (19),
- multiple pistons (50), of which in each case one is displaceably mounted in a piston seat (35) and which, over at least part of its length, has a guide and sealing cross section that differs from a circular shape and matches a guide and sealing cross section of the piston seats (35), which differs from a circular shape and remains constant as far as outside of the rotor, and
- cylindrical rollers (58) which are borne by the pistons (50) in bearing seats (56) and are aligned with their axes of rotation (59) in direction of axis of rotation of the rotor (18), via which the pistons (50) are supportable on the lifting ring (15) and which have two end faces (60) that face away from each other and run at right angles to their axis of rotation (59), wherein
- the piston seats (35) have two flat wall sections (44) aligned at right angles to the axis of rotation (59) of the rollers (58), and distance between the two end faces (60) of a roller (58) is only slightly smaller than distance between the two flat wall sections (44) of the piston seats (35).
Dependencies are inferred from the claim text.