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Powershift reversing transmission

  • US 5,918,509 A
  • Filed: 10/02/1997
  • Issued: 07/06/1999
  • Est. Priority Date: 05/16/1995
  • Status: Expired due to Fees
First Claim
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1. A powershift reversing transmission (1) having one hydrodynamic torque converter (2), one input shaft (6), one countershaft (12), one output shaft (13), fixed and idler gear wheels (10, 11, 14, 15) which form a reversing set, said idler gear wheels can optimally be non-rotatably connected with one of said input shaft and countershaft and clutches (17, 18) which have actuating devices (20) for shifting direction, wherein each clutch (17, 18) is actuatable by spring tension when engaging and by hydraulic pressure against spring tension when disengaging, a directional valve (30 or 31) is provided for actuating each clutch (17 or 18) which, in a shifting position, connects an annular chamber (22) of each actuating device (20) with a feed pipe (29) and, in another shifting position, connects said annular chamber (22) with a reservoir (33), via a return pipe (32), from which a pressurized medium conveyed to said reservoir flows out through an aperture (37), and inserted in said return pipe (32), before said reservoir (33) and said aperture (37), which is a directional valve (40) during normal operation, maintains said return pipe continuously open and, in a pressureless state for starting a braking operation, connects said return pipe with another reservoir (42) from which the pressurized medium flows out through another aperture (45).

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