DRIVE WITH A TORQUE SPLIT TRANSMISSION

• US 20090036248A1
• Filed: 03/13/2007
• Published: 02/05/2009
• Est. Priority Date: 03/13/2006
• Status: Abandoned Application

• Current Assignee: Bosch Rexroth AG (Robert Bosch GmbH)
• Original Assignee: Bosch Rexroth AG (Robert Bosch GmbH)
• Inventors: Mutschler, Steffen, Mueller, Matthias
• Application Number:
  US12/279,143
• Publication Number:
  US 20090036248A1
• Time in Patent Office: Days
• US Class Current: 475/72
• CPC Class Codes: B60K 6/12 by means of a chargeable fluidic accumulator
• CPC Class Codes: B60T 1/10 by utilising wheel movement for accumulating energy, e.g. driving air compressors
• CPC Class Codes: B60Y 2200/41 Construction vehicles, e.g. graders, excavators
• CPC Class Codes: F16H 2037/088 Power split variators with summing differentials, with the input of the CVT connected or connectable to the input shaft
• CPC Class Codes: F16H 47/04 the mechanical gearing being of the type with members having orbital motion
• CPC Class Codes: F16H 61/4096 with pressure accumulators
• CPC Class Codes: F16H 61/4157 Control of braking, e.g. preventing pump over-speeding when motor acts as a pump
• CPC Class Codes: Y02T 10/62 Hybrid vehicles

Abstract

The invention concerns a drive with a torque split transmission (1). The torque split transmission (1) includes a hydraulic pump (9) and a hydraulic motor (12), which are connected to each other via a first work line (10) and a second work line (11). The drive also has at least one first storage element (21) to store braking energy, it being possible to connect the at least one first storage element (21) to the first work line (10) or second work line (11). The hydraulic pump (9) and the hydraulic motor (12) are connected mechanically to a driven shaft (18).

Claims

1. Drive with a torque split transmission, which includes a hydraulic pump, and a hydraulic motor which is connected to it via a first work line and a second work line,

wherein

at least one first storage element can be connected to the first work line or second work line to store braking energy, and that the hydraulic pump and the hydraulic motor are connected mechanically to a driven shaft.

2. Drive according to claim 1,

wherein

the torque split transmission includes at least one planetary gear train, and the hydraulic motor is connected to one element, and the hydraulic pump is connected to another element, of the planetary gear train.

3. Drive according to claim 1,

wherein

the torque split transmission includes a mechanical power branch and a hydraulic power branch, and moment can be transmitted both via one of the power branches and via both power branches.

4. Drive according to claim 1,

wherein

the torque split transmission can be driven by a drive motor, and the drive motor can be decoupled from the torque split transmission by means of a clutch.

5. Drive according to claim 1,

wherein

the torque split transmission has a first planetary gear train, and a first drive shaft section which is connected to the hydraulic pump, and a second drive shaft section which is connected to the first planetary gear train, and the first drive shaft section can be connected to the second drive shaft section so that it can be released.

6. Drive according to claim 4,

wherein

the torque split transmission includes a second planetary gear train, the sun wheel of which is also connected to the second drive shaft section, and the internal gear of which is connected to the internal gear of the first planetary gear train.

7. Drive according to claim 5,

wherein

the first drive shaft section and second drive shaft section can be connected to each other via at least one transmission stage.

8. Drive according to claim 6,

wherein

the planet carrier of the second planetary gear train can be blocked.

9. Drive according to claim 5,

wherein

the planet carrier of the first planetary gear train is connected to a driven shaft of the torque split transmission.

10. Drive according to claim 1,

wherein

the drive has a second storage element, which in the case of a first storage element being connected to one of the two work lines, is connected to the other work line.

11. Drive according to claim 1

wherein

during braking operation and above a pressure limit in the first storage element, the drive motor is switched off.