Integrated electro-hydraulic unit housing

An integrated electro-hydraulic unit comprising:

• a hydraulic machine including a rotary working group configured to pump a working fluid;
• an electric machine encircling the hydraulic machine, the electric machine including a stator and a rotor coupled to the rotary working group such that the rotor drives the rotary working group about an axis;
• and
• a housing at least partially surrounding the electric machine and the hydraulic machine, the housing including
• a front cap having a front plate defining a first outer axial surface and a first inner axial surface opposite the first outer axial surface,
• an end cap having an end plate defining a second outer axial surface and a second inner axial surface opposite the second outer axial surface, the second inner axial surface facing the first inner axial surface of the front cap,
• a housing shell extending between the front cap and the end cap, the housing shell having a first axial end abutting the first inner axial surface and a second axial end abutting the second inner axial surface, and
• a plurality of tie rods extending from a plurality of first tie rod openings in the front cap to a plurality of second tie rod openings in the end cap,
• wherein the plurality of tie rods are tensioned between the front cap and the end cap such that the end cap, the front cap, and the housing shell are compressed.

An integrated electro-hydraulic unit comprising:

• an electric machine including a stator and a rotor,
• a hydraulic machine including
• a shaft,
• a bearing supporting the shaft,
• a cylinder block driven about an axis by the rotor and coupled to the shaft,
• a plurality of pistons received in the cylinder block,
• a swashplate configured to axially move the plurality of pistons, and
• a valve plate including a plurality of ports, the plurality of ports including a first port and a second port, each of the first and second ports are configured to exchange a working fluid with the cylinder block by action of the plurality of pistons;
• and
• a housing having
• a front cap having a front plate and a projection extending from the front plate, the projection defining a projection distal end which abuts the swashplate,
• an end cap having an end plate and a protrusion extending from the end plate, the protrusion defining a protrusion distal end in which a bearing recess is formed, and
• a housing shell encircling the electric machine and sandwiched between the front cap and the end cap,
• wherein the bearing is positioned in the bearing recess of the protrusion such that the protrusion supports the bearing and the shaft, and
• wherein a plurality of tie rods are tensioned on the front cap and the end cap such that the end cap, the front cap, and the housing shell are compressed.