Patent ID: 9518466
Filing Date: 2016-12-13
CPC Classification: B60K,F01B,F04B

Claim Text:
1. A hydraulic apparatus with radial pistons, comprising: a casing defining a first assembly, a shaft defining a second assembly, said first and second assemblies being free in rotation one relative to the other, a multilobe cam connected in rotation to one of said first and second assemblies, a distributor and a distributor lid, a cylinder block mounted free in rotation relative to said first and second assemblies, and comprising a plurality of cylinders in which said radial pistons are arranged to slide radially in the respective cylinders of the cylinder block and supported on the lobes of the cam, said apparatus comprises support springs arranged in said cylinders so as to keep the pistons supported against the cam, characterized in that said hydraulic apparatus also comprises engagement means in rotation adapted, during the application of a command, to immobilise the cylinder block relative to one of said first and second assemblies and, upon release of the command, to disengage the cylinder block relative to the other of said first and second assemblies.