# US 10,480,388 B2 · Liquid cooled radial power plant having an external coolant manifold

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- Number: US 10,480,388 B2
- Document ID: US10480388B2
- Status: Granted
- Kind: B2
- Application number: 15/259,940
- Filed: 2016-09-08
- Published: 2018-03-08
- Granted: 2019-11-19
- Earliest claimed: 2016-09-08
- Assignees: Unigen Power Inc.
- Applicants: UniGen Power Inc.
- Inventors: Anthony Joseph Carmen, Jr.; Nicholas Anthony Salvatore
- Web page: https://patentgrep.com/patent/US10480388B2

## CPC

- F01P 3/02: Arrangements for cooling cylinders or cylinder heads
- F01B 1/062: {the connection of the pistons with an actuating or actuated element being at the inner ends of the cylinders}
- F01P 11/04: Arrangements of liquid pipes or hoses
- F02B 63/048: {Portable engine-generator combinations}
- F02B 75/222: {with cylinders in star arrangement}
- F02F 1/10: for liquid cooling
- F02F 1/102: {Attachment of cylinders to crankcase}
- F02F 1/166: {Spacer decks}
- H02K 5/203: {specially adapted for liquids, e.g. cooling jackets}
- H02K 7/1815: {structurally associated with reciprocating piston engines (general aspects of generating sets, e.g. housing, F02B63/04)}
- H02K 19/16: Synchronous generators
- F01P 2003/021: {Cooling cylinders}
- H02K 5/24: specially adapted for suppression or reduction of noise or vibrations
- F01P: COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES (arrangements in connection with cooling of propulsion units in vehicles B60K11/00; heat-transfer, heat-exchange or heat-storage materials C09K5/00; {cooling of gas-turbine engines F02C7/12}; heat exchange in general, radiators F28)
- F01B: MACHINES OR ENGINES, IN GENERAL OR OF POSITIVE-DISPLACEMENT TYPE, e.g. STEAM ENGINES (of rotary-piston or oscillating-piston type F01C; of non-positive-displacement type F01D; internal-combustion engines F02B; combustion-product engine plants F02G; machines or engines, other than of positive-displacement type, for liquids F03B; positive-displacement engines driven by liquids F03C; wind motors F03D; positive-displacement machines for liquids F04B; rotary-piston, or oscillating-piston, positive-displacement machines for liquids F04C)
- F02B: INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL (gas-turbine plants F02C; hot-gas or combustion-product positive-displacement engine plants F02G)
- F02F: CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
- H02K: DYNAMO-ELECTRIC MACHINES (dynamo-electric relays H01H53/00; conversion of DC or AC input power into surge output power {H03K3/53})

## Abstract

Methods and systems for cooling a radial engine in a ground-based portable electric power generating system. The engine includes a plurality of cylinders extending radially from a central hub supporting a crankshaft. Each cylinder has a coolant inlet port and a coolant outlet port. The cooling system includes an inlet coolant manifold interconnecting at least two of the coolant inlet ports. The inlet coolant manifold is disposed external to the central hub.

## Claims

### Claim 1

A ground-based electric power generating system, comprising:
a generator coupled to a radial engine of the type including a central hub and a plurality of radially extending cylinder assemblies, each cylinder assembly comprising:
an inner sleeve having a top flange, wherein the inner sleeve is configured to provide a path for a reciprocating piston;
an outer jacket having a cylindrical jacket wall terminating at a horizontal step, a fluid inlet port extending through the cylindrical jacket wall, and a fluid outlet port extending through the cylindrical jacket wall;
a fluid path defined between the inner sleeve and the cylindrical jacket wall of the outer jacket; and
a cylinder head having a horizontal plate;
wherein the top flange is clamped between the horizontal step and the horizontal plate to thereby secure the inner sleeve within the cylinder assembly;
wherein the fluid inlet port is configured to communicate cooling fluid to the fluid path from a fluid inlet manifold disposed external to the cylinder assemblies;
wherein the fluid outlet port is configured to communicate cooling fluid from the fluid path to a fluid outlet manifold disposed external to the cylinder assemblies;
wherein the fluid inlet manifold is a regular, nine-sided polygonal structure having rotational symmetry about an axis defined by a crankshaft of the radial engine wherein each vertex of the polygonal structure is coupled to a corresponding inlet port of the cylinder assemblies.

### Claim 2 (depends on 1)

The system of claim 1, wherein the fluid inlet manifold is secured to the central hub.

### Claim 3 (depends on 1)

The system of claim 1, wherein the fluid inlet manifold is secured to the plurality of radially extending cylinder assemblies.

### Claim 4 (depends on 1)

The system of claim 1, wherein the fluid inlet manifold is secured to the system external to the central hub and the radially extending cylinder assemblies.

### Claim 5 (depends on 1)

The system of claim 1, wherein the radial engine is configured for steady state operation in the range of 2300 RPM.

### Claim 6

A portable system for generating electric power, comprising:
an electric generator;
a radial engine having a crankshaft coupled to the electric generator and a plurality of cylinders extending radially from a central hub, each cylinder comprising an inner sleeve, an outer cylindrical jacket, an inlet port extending through the outer cylindrical jacket, an outlet port extending through the outer cylindrical jacket, wherein the inner sleeve is configured to provide a path for a reciprocating piston;
a towable wheeled chassis supporting the electric generator and the radial engine; and
a fluid cooling system comprising an inlet manifold configured to supply coolant to each of the plurality of inlet ports, and an outlet manifold configured to exhaust coolant from each of the plurality of outlet ports;
wherein the inlet manifold and the outlet manifold are external to the central hub, and the inlet manifold is a regular, nine-sided polygonal structure having rotational symmetry about an axis defined by a crankshaft of the radial engine wherein each vertex of the polygonal structure is coupled to a corresponding inlet port of the cylinder assemblies.

### Claim 7 (depends on 6)

The system of claim 6, wherein at least one of the inlet manifold and the outlet manifold are mounted to the central hub.

### Claim 8 (depends on 6)

The system of claim 6, wherein at least one of the inlet manifold and the outlet manifold are mounted to the plurality of cylinders.