IP Library › Granted Patent US 12669120
Granted Patent B2
US 12669120 · App. 18/637,981 · Granted Jun 30, 2026

Electric and hydraulic machine

Inventors: Enrique Busquets (Fountain Inn, SC); Uwe Neumann (Fountain Inn, SC); Andrea Vacca (Lafayette, IN); Federico Zappaterra (Ferra, IT)
Assignee: Bosch Rexroth Corporation
F04C2/102F04C2/084F04C11/008F04C2240/30F04C2240/40F04C2240/402F04D13/06
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Quick Facts
Patent No.
US 12669120
App. No.
18/637,981
Granted
Jun 30, 2026
Kind
B2
Abstract

An electric and hydraulic machine includes a housing defining a motor chamber and a pump chamber, a motor comprising a rotor and a stator positioned within the motor chamber, and a pump comprising a pumping element positioned within the pump chamber, the pumping element movable by the motor to displace fluid in the pump chamber. The pump chamber includes a low-pressure chamber and a high-pressure chamber, a unit inlet defined by the housing and in communication with the low-pressure chamber, and a unit outlet defined by the housing and in communication with the high-pressure chamber. The pump chamber is positioned radially inward of the motor chamber such that the pump is nested within the motor. A radial cooling channel extends in a radial direction from the low-pressure chamber to the motor chamber such that fluid in the pump chamber communicates with the rotor and the stator to cool the motor.

Claims (21)

1 . An electric and hydraulic machine comprising:

a first housing defining a first motor chamber and a first pump chamber;

a first motor comprising a rotor and a stator positioned within the first motor chamber;

a first pump comprising a first pumping element positioned within the first pump chamber, the first pumping element movable by the first motor to displace fluid in the first pump chamber, the first pump chamber including a low-pressure chamber and a high-pressure chamber, a unit inlet defined by the first housing and in communication with the low-pressure chamber, and a unit outlet defined by the first housing and in communication with the high-pressure chamber, the first pump chamber positioned radially inward of the first motor chamber such that the first pump is nested within the first motor;

a second housing defining a second motor chamber and a second pump chamber, the second housing axially aligned with and coupled to the first housing;

a second motor comprising a rotor and a stator positioned within the second motor chamber; and

a second pump comprising a second pumping element positioned within the second pump chamber, the second pumping element movable by the second motor to displace fluid in the second pump chamber, the second pump chamber including a low-pressure chamber and a high-pressure chamber, a unit inlet interconnecting the low-pressure chamber of the first pump with the low-pressure chamber of the second pump, and a unit outlet interconnecting the high-pressure chamber of the first pump with the high-pressure chamber of the second pump,

wherein the first housing extends between a first axial end and a second axial end of the first housing, wherein the second housing extends between a first axial end and a second axial end of the second housing, wherein the second axial end of the first housing is positioned against the first axial end of the second housing such that the second housing is axially aligned with and coupled to the first housing, and wherein the unit inlet of the first pump is an opening through the first axial end of the first housing of the first pump.

2 . The electric and hydraulic machine of claim 1 , wherein the pump chamber of the first pump is positioned radially inward of the motor chamber of the first housing such that the first pump is nested within the first motor, and wherein the pump chamber of the second pump is positioned radially inward of the motor chamber of the second housing such that the second pump is nested within the second motor.

3 . The electric and hydraulic machine of claim 1 , wherein the first motor is identical to the second motor and the first pump is identical to the second pump.

4 . The electric and hydraulic machine of claim 3 , further comprising a cover positioned on the second axial end of the second housing such that the second housing is positioned axially between the first housing and the cover.

5 . The electric and hydraulic machine of claim 1 , wherein the first pump is controllable via the first motor and the second pump is controllable via the second motor.

6 . The electric and hydraulic machine of claim 1 , wherein the unit inlet of the first pump is axially aligned with the unit inlet of the second pump and the unit outlet of the first pump is axially aligned with the unit outlet of the second pump.

7 . The electric and hydraulic machine of claim 1 , wherein the low-pressure chamber of the first pump is axially aligned with from the low-pressure chamber of the second pump, and wherein the high-pressure chamber of the first pump is axially aligned with from the high-pressure chamber of the second pump.

8 . The electric and hydraulic machine of claim 1 , wherein the electric and hydraulic machine is operable in a first mode in which the first motor actuates the first pump and the second motor is deactivated, and a second mode in which the first motor actuates the first pump and the second motor actuates the second pump.

9 . The electric and hydraulic machine of claim 8 , wherein the electric and hydraulic machine is operable in a third mode in which the first motor is deactivated, and the second motor actuates the second pump.

10 . The electric and hydraulic machine of claim 1 , wherein the first pumping element includes a first gear arrangement operable to displace fluid from the low-pressure chamber of the first pump and wherein the second pumping element includes a second gear arrangement operable to displace fluid from the low-pressure chamber of the second pump.

11 . The electric and hydraulic machine of claim 10 , wherein the first gear arrangement is operable regardless of operation of the second gear arrangement.

12 . The electric and hydraulic machine of claim 1 , wherein the unit outlet of the first pump is an opening through the first axial end of the first housing of the first pump.

13 . The electric and hydraulic machine of claim 1 , wherein the unit inlet of the second pump is an opening through the first axial end of the second housing of the second pump at an interface of the first axial end of the second pump and the second axial end of the first pump.

14 . The electric and hydraulic machine of claim 1 , wherein the first housing is separable from the second housing.