Tandem pump unit
AssigneeKanzaki Kokyukoki Mfg. Co., Ltd.
InventorsRyota Ohashi, Hironori Sumomozawa
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Abstract
The present invention provides a tandem pump unit that includes: a first hydraulic pump and a second hydraulic pump respectively having a first pump shaft and a second pump shaft respectively having adjacent ends connected together so that the first and second pump shafts are coaxially aligned and non-rotatably connected in tandem; a common housing for accommodating the first hydraulic pump and the second hydraulic pump; and a first center section and a second center section that respectively support the first and second hydraulic pumps.
Claims9
A pump unit for supplying oil to first and second hydraulic motors respectively connected to left and right drive wheels, comprising:
- a first hydraulic pump which includes a first pump shaft with first and second ends and which is fluidly connected to the first hydraulic motor through a first closed circuit;
- a second hydraulic pump which includes a second pump shaft with first and second ends and which is fluidly connected to the second hydraulic motor through a second closed circuit;
- a charge pump for replenishing oil into the first and second closed circuits;
- a first housing which has an opening for accommodating the first hydraulic pump and which supports the first end of the first pump shaft, the opening facing in a direction along an axis line of the first pump shaft and having a size for allowing the first hydraulic pump to be passed therethrough;
- a second housing which has an opening for accommodating the second hydraulic pump and which supports the second end of the second pump shaft, the opening facing in a direction along an axis line of the second pump shaft and having a size for allowing the second hydraulic pump to be passed therethrough;
- a common center section which has a first side closing the opening of the first housing and supporting the second end of the first pump shaft, a second side closing the opening of the second housing and supporting the first end of the second pump shaft, the second side being opposite to the first side, a hole penetrating between the first and second sides, the common center section including a charge passage;
- and
- a coupler which is accommodated within the hole and which operatively connects the second end of the first pump shaft and the first end of the second pump shaft;
- wherein
- the first end of the first pump shaft extends outwards from the first housing to be operatively connected to a power source;
- the charge pump is mounted to the second housing;
- the second end of the second pump shaft extends outwards from the second housing to drive the charge pump;
- and
- the second housing is provided with a passage for introducing pressurized oil from the charge pump into the charge passage.
Dependencies are inferred from the claim text.