# US 7,411,310 B2 · Precision alignment hub

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- Number: US 7,411,310 B2
- Document ID: US7411310B2
- Status: Granted
- Kind: B2
- Application number: 11/100,651
- Filed: 2005-04-07
- Published: 2006-10-12
- Granted: 2008-08-12
- Earliest claimed: 2005-04-07
- Assignees: Hydrogen Engine Center, Inc.
- Inventors: Ted Hollinger
- Web page: https://patentgrep.com/patent/US7411310B2

## CPC

- H02K 5/00: Casings; Enclosures; Supports
- F02B 63/04: for electric generators
- H02K 7/1815: {structurally associated with reciprocating piston engines (general aspects of generating sets, e.g. housing, F02B63/04)}
- F02B 63/044: {the engine-generator unit being placed on a frame or in an housing}
- H02K: DYNAMO-ELECTRIC MACHINES (dynamo-electric relays H01H53/00; conversion of DC or AC input power into surge output power {H03K3/53})
- F02B: INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL (gas-turbine plants F02C; hot-gas or combustion-product positive-displacement engine plants F02G)

## Abstract

A distributed generator system is provided having an alignment hub to assist in the alignment and securement of an engine and a generator of the system. The system comprises a distributed generator system having an engine and a single bearing generator, and an alignment hub for defining an alignment position between the engine and the generator and maintaining the alignment within a predetermined tolerance.

## Claims

### Claim 1

A distributed generator system having an alignment hub to assist in the alignment and securement of an engine and a generator of said system, comprising:
(a) a drive shaft rotated by the engine;
(b) a flywheel connected to and rotated by the drive shaft about an axis of rotation;
(c) a single bearing generator;
(d) a projection of the generator having a circular cross section including a cylindrical surface having a projection diameter and which is extended toward the engine in the direction of the axis of rotation of the generator; and
(e) an alignment hub, having a circular cross section including a cylindrical surface having an alignment hub diameter, secured to the flywheel and centered on the axis of rotation of the flywheel in alignment with and overlapping the projection of the flex plate to define a gap within a predetermined tolerance between the cylindrical surface of the alignment hub and the cylindrical surface of the projection to allow movement of the alignment hub relative to the projection along the axis of rotation.

### Claim 2 (depends on 1)

A system as defined in claim 1 wherein said engine operates at greater than 2000 rpm.

### Claim 3 (depends on 2)

A system as defined in claim 2 wherein the gap is of a size to prevent damaging harmonics in the single bearing generator.

### Claim 4 (depends on 1)

A system as defined in claim 1 wherein the projection diameter is an outer diameter and the alignment hub diameter is an inner diameter that is less than the projection diameter.

### Claim 5 (depends on 1)

A system as defined in claim 1 wherein the projection diameter is an inner diameter and the alignment hub diameter is an outer diameter that is greater than the projection diameter.

### Claim 6

A method for aligning the engine and generator of a distributed generator system including an engine that rotates a flywheel about an axis of rotation and a generator including a flex plate releasably mounted to the flywheel and having an axis of rotation, comprising the steps of:
(a) forming a projection on the flex plate having a circular cross section including a cylindrical surface with a projection diameter and extended in the direction of the axis of rotation of the flex plate and centered on the axis of rotation of the flex plate;
(b) forming an alignment hub on the flywheel having a circular cross section including a cylindrical surface with an alignment hub centered on the axis of rotation of the flywheel;
(c) positioning the engine and generator in proximity to each other with the axis of rotation of the flywheel in rough alignment with the axis of rotation of the flex plate;
(d) moving the engine and generator toward each other generally along the roughly aligned axes of rotation to bring the cylindrical surface of the alignment hub adjacent the cylindrical surface of the projection to bring the axes of rotation of the engine and the generator into tight alignment; and
(e) securing the engine to the generator.

### Claim 7 (depends on 6)

A method as defined in claim 6 wherein the projection diameter is an outer diameter and the alignment hub diameter is an inner diameter that is less than the projection diameter.

### Claim 8 (depends on 6)

A method as defined in claim 6 wherein the projection diameter is an inner diameter and the alignment hub diameter is an outer diameter that is greater than the projection diameter.