# US 11,028,863 B2 · Low voltage electric-hydraulic drive system for electric transportation > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,028,863 B2 - Document ID: US11028863B2 - Status: Granted - Kind: B2 - Application number: 16/776,672 - Filed: 2020-01-30 - Published: 2020-08-06 - Granted: 2021-06-08 - Earliest claimed: 2019-01-31 - Assignees: GenCell Corporation - Applicants: Gencell Ltd. - Inventors: Gennadi Finkelshtain; Tsepin Tsai; Ziya Karichev - Web page: https://patentgrep.com/patent/US11028863B2 ## CPC - F15B 11/17: using two or more pumps - F16H 61/44: with more than one pump or motor in operation - B60K 8/00: Arrangement or mounting of propulsion units not provided for in one of main groups B60K1/00 - B60K7/00 - B60K 17/10: of fluid gearing - B60Y 2200/91: Electric vehicles - B60Y 2200/92: Hybrid vehicles - F15B: SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR - F16H: GEARING - B60K: ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES - B60Y: INDEXING SCHEME RELATING TO ASPECTS CROSS-CUTTING VEHICLE TECHNOLOGY ## Abstract Disclosed is a hydraulic drive system for a vehicle, which system comprises a hydraulic motor, at least one hydraulic pump, at least one low voltage electric motor, at least one low voltage battery and at least one low voltage fuel cell. ## Claims ### Claim 1 A hydraulic drive system for a vehicle, wherein the system comprises a hydraulic motor, at least two hydraulic pumps, at least two low voltage electric motors, a low voltage battery and a low voltage fuel cell, and wherein the hydraulic motor is connected to at least a first hydraulic pump and a second hydraulic pump, the first hydraulic pump being connected to a first low voltage electric motor and the second hydraulic pump being connected to a second low voltage electric motor, and wherein (a) both the first low voltage electric motor and the second low voltage electric motor are connected to at least one low voltage battery and at least one low voltage hydrogen fuel cell; or (b) the first low voltage electric motor is connected to at least two low voltage batteries but is not connected to a low voltage fuel cell and the second low voltage electric motor is connected to at least two low voltage hydrogen fuel cells but is not connected to a low voltage battery. ### Claim 2 (depends on 1) The hydraulic drive system of claim 1, wherein the hydraulic motor is connected to at least one hydraulic pump which is connected to a low voltage electric motor which in turn is connected to at least one low voltage battery and at least one low voltage hydrogen fuel cell. ### Claim 3 (depends on 1) The hydraulic drive system of claim 1, wherein both the first low voltage electric motor and the second low voltage electric motor are connected to at least one low voltage battery and at least one low voltage hydrogen fuel cell. ### Claim 4 (depends on 1) The hydraulic drive system of claim 1, wherein the first low voltage electric motor is connected to at least two low voltage batteries but is not connected to a low voltage fuel cell and the second low voltage electric motor is connected to at least two low voltage hydrogen fuel cells but is not connected to a low voltage battery. ### Claim 5 (depends on 1) The hydraulic drive system of claim 1, wherein at least one low voltage hydrogen fuel cell is an alkaline fuel cell. ### Claim 6 (depends on 1) The hydraulic drive system of claim 1, wherein the system is capable of recovering breaking energy for charging the at least one low voltage battery. ### Claim 7 (depends on 1) The hydraulic drive system of claim 1, wherein at least one low voltage electric motor has a voltage of not higher than 100 V. ### Claim 8 (depends on 1) An electric vehicle, wherein the vehicle comprises the hydraulic drive system of claim 1. ### Claim 9 (depends on 8) The vehicle of claim 8, wherein the vehicle is a bus, a truck or an all-wheel drive vehicle. ### Claim 10 (depends on 8) The vehicle of claim 8, wherein each wheel of the vehicle is connected to at least one hydraulic drive system comprising a hydraulic motor, at least one hydraulic pump, at least one low voltage electric motor, at least one low voltage battery and at least one low voltage fuel cell. ### Claim 11 (depends on 8) The vehicle of claim 8, wherein at least two wheels of the vehicle are connected to different hydraulic motors. ### Claim 12 An electric vehicle, wherein the vehicle comprises at least two hydraulic drive systems each of which comprises a hydraulic motor connected to at least one hydraulic pump which in turn is connected to a low voltage electric motor, and wherein at least one low voltage electric motor comprised in any of the at least two hydraulic drive systems is connected to at least one low voltage battery, and at least one low voltage electric motor comprised in any of the at least two hydraulic drive systems is connected to at least one low voltage fuel cell. ### Claim 13 An electric vehicle, wherein the vehicle comprises a hydraulic drive system comprising a hydraulic motor, at least one hydraulic pump, at least one low voltage electric motor, at least one low voltage battery and at least one low voltage fuel cell, and wherein at least all electric components and hydraulic pump(s) of the drive system are present in a water-proof compartment of the vehicle and/or are present in an elevated location of the vehicle. ### Claim 14 (depends on 13) The vehicle of claim 13, wherein at least all electric components and hydraulic pump(s) of the drive system are present in a water-proof compartment of the vehicle. ### Claim 15 (depends on 13) The vehicle of claim 13, wherein at least all electric components and hydraulic pump(s) of the drive system are present in an elevated location of the vehicle. ### Claim 16 (depends on 13) The vehicle of claim 13, wherein the vehicle is a bus, a truck or an all-wheel drive vehicle. ### Claim 17 (depends on 13) The vehicle of claim 13, wherein each wheel of the vehicle is connected to at least one hydraulic drive system which comprises a hydraulic motor, at least one hydraulic pump, at least one low voltage electric motor, at least one low voltage battery and at least one low voltage fuel cell. ### Claim 18 (depends on 13) The vehicle of claim 13, wherein at least two wheels of the vehicle are connected to different hydraulic motors. ### Claim 19 (depends on 13) The vehicle of claim 13, wherein at least one low voltage hydrogen fuel cell is an alkaline fuel cell. ### Claim 20 (depends on 13) The vehicle of claim 13, wherein at least one low voltage electric motor has a voltage of not higher than 100 V.