
{"publication_number": "US-2002148691-A1", "abstract": "a drive unit includes a motor , a hydrodynamic retarder , at least one pump , at least one feed line for feeding operating medium to the retarder , and at least one bypass line which conveys operating medium past the retarder . a device for directing the flow of operating medium is arranged upstream of the retarder in the direction of flow . the device can feed the operating medium through the retarder via the feed line , feed the operating medium past the retarder via a bypass line , or divide the total flow of operating medium into at least two predetermined parts . a first predetermined part of the operating medium is fed through the retarder via the feed line . a second predetermined part of the operating medium is conveyed past the retarder via the bypass line .", "application_number": "US-96806101-A", "description": "referring now to the drawings and particularly to fig1 there is shown a drive unit , wherein the operating medium of the retarder is also the cooling medium of the motor . the drive unit includes a coolant circuit having a pump 1 . 0 . downstream from the pump 1 . 0 , as viewed in the operating medium flow direction , a valve 2 . 0 is installed , which in this instance is arranged as a { fraction ( 3 / 2 )