# US 10,480,159 B2 · Kinetic energy recovery system for a machine

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 10,480,159 B2
- Document ID: US10480159B2
- Status: Granted
- Kind: B2
- Application number: 15/613,987
- Filed: 2017-06-05
- Published: 2018-12-06
- Granted: 2019-11-19
- Earliest claimed: 2017-06-05
- Assignees: Caterpillar Inc.
- Applicants: Caterpillar Inc.
- Inventors: Anthony Dean McNealy; Corey Lee Gorman; Shogo Tada; Rustin Glenn Metzger; Hideki Nakajima; Justin Douglas Speichinger; Shinya Ohmura
- Web page: https://patentgrep.com/patent/US10480159B2

## CPC

- E02F 9/2217: {with energy recovery arrangements, e.g. using accumulators, flywheels}
- F15B 21/14: Energy-recuperation means
- B60K 6/10: by means of a chargeable mechanical accumulator, e.g. flywheel
- B60K 6/105: {the accumulator being a flywheel}
- F15B 2211/205: Systems with pumps
- F15B 2211/20515: Electric motor
- F15B 2211/20523: Internal combustion engine
- F15B 2211/20546: variable capacity
- F15B 2211/20569: capable of working as pump and motor
- F15B 2211/7053: Double-acting output members
- F15B 2211/7058: Rotary output members
- F15B 2211/71: Multiple output members, e.g. multiple hydraulic motors or cylinders
- F15B 2211/761: Control of a negative load, i.e. of a load generating hydraulic energy
- F15B 2211/88: Control measures for saving energy
- Y02T 10/62: Hybrid vehicles
- E02F: DREDGING; SOIL-SHIFTING (winning peat E21C49/00)
- F15B: SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- 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
- Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION

## Abstract

A kinetic energy recovery system (KERS) for a machine having a swing motor and/or an actuator includes a hydraulic motor/pump that can output pressurized fluid for operating at least one of: the swing motor and the actuator. A first shaft of the hydraulic motor/pump can be rotated by fluid returning from at least one of: the swing motor and the actuator back to the hydraulic motor/pump. Further, the KERS also includes a flywheel that can selectively couple with the first shaft with the help of a first clutch. The flywheel stores drive power generated by the hydraulic motor/pump from the return flow of fluid when the first clutch couples the flywheel with the first shaft of the hydraulic motor/pump. A gearing arrangement is coupled to the flywheel and can selectively engage with a second shaft associated with a prime mover of the machine with the help of a second clutch.

## Claims

### Claim 1

A kinetic energy recovery system (KERS) for a machine having a prime mover, a swing motor and an actuator therein, the KERS comprising:
a KERS selection valve fluidly connected to a hydraulic motor/pump via a hydraulic motor/pump conduit, the KERS selection valve operated to:
selectively receive hydraulic energy from the swing motor via a swing-motor conduit and the actuator via an actuator conduit, the actuator conduit being separate from the swing-motor conduit, when the hydraulic motor/pump is actuated as a hydraulic motor; and
selectively supply hydraulic energy to the swing motor via the swing-motor conduit and to the actuator via the actuator conduit when the hydraulic motor/pump is actuated as a hydraulic pump;
the hydraulic motor/pump disposed in fluid communication with a fluid source via a fluid source conduit, the hydraulic motor/pump configured to output pressurized fluid via the hydraulic motor/pump conduit to the KERS selection valve for selectively operating the swing motor or the actuator based on the selective operation of the KERS selection valve, wherein a first shaft operably and mechanically attached to the hydraulic motor/pump is configured to be operatively rotated by a flow of fluid returning, via the KERS selection valve, from the swing motor or the actuator back to the fluid source via the hydraulic motor/pump;
a flywheel configured to selectively couple with the first shaft of the hydraulic motor/pump with the help of a first clutch, the flywheel configured to store drive power generated by the hydraulic motor/pump from the return flow of fluid when the first clutch couples the flywheel with the first shaft of the hydraulic motor/pump; and
a gearing arrangement coupled to the flywheel and configured to selectively engage with a second shaft associated with the prime mover of the machine, the gearing arrangement being selectively engaged to the second shaft with the help of a second clutch, wherein the first clutch is selectively operable for facilitating a transfer of drive power from the first shaft of the hydraulic motor/pump to the flywheel, and wherein the second clutch is selectively operable for transferring stored drive power from the flywheel to the second shaft associated with the prime mover.

### Claim 2 (depends on 1)

The KERS of claim 1, wherein the flywheel is mounted on a first intermediary shaft that is co-located with the first shaft and configured to support, at least in part, the first clutch thereon.

### Claim 3 (depends on 2)

The KERS of claim 2, wherein the gearing arrangement includes:
a first gear wheel rigidly mounted to an end of the first intermediary shaft; and
a second gear wheel disposed in rotatable engagement with the first gear wheel, the second gear wheel mounted on a second intermediary shaft co-located with the second shaft associated with the prime mover.

### Claim 4 (depends on 3)

The KERS of claim 3, wherein an end of the second shaft is configured to support, at least in part, the second clutch thereon.

### Claim 5 (depends on 4)

The KERS of claim 4, wherein the second clutch is selectively operable to couple the second shaft with the second intermediary shaft.

### Claim 6 (depends on 1)

The KERS of claim 1, wherein the first clutch and the second clutch are operable independently of one another.

### Claim 7 (depends on 1)

The KERS of claim 1, wherein the hydraulic motor/pump conduit associated with the hydraulic motor/pump is configured to allow the fluid to return from each of: the swing motor and the actuator to the hydraulic motor/pump.

### Claim 8

A kinetic energy recovery system (KERS) for a machine having a prime mover, and a swing motor and an actuator therein, the KERS comprising:
a KERS selection valve fluidly connected to a hydraulic motor/pump via a hydraulic motor/pump conduit, the KERS selection valve operated to:
selectively receive hydraulic energy from the swing motor via a swing-motor conduit and the actuator via an actuator conduit, the actuator conduit being separate from the swing-motor conduit, when the hydraulic motor/pump is actuated as a hydraulic motor; and
selectively supply hydraulic energy to the swing motor via the swing-motor conduit and to the actuator via the actuator conduit when the hydraulic motor/pump is actuated as a hydraulic pump;
the hydraulic motor/pump disposed in fluid communication with a fluid source via a fluid source conduit, the hydraulic motor/pump configured to output pressurized fluid via the hydraulic motor/pump conduit to the KERS selection valve for selectively operating the swing motor or the actuator based on the selective operation of the KERS selection valve, wherein a first shaft operably and mechanically attached to the hydraulic motor/pump is configured to be operatively rotated by a flow of fluid returning, via the KERS selection valve, from the swing motor or the actuator back to the fluid source via the hydraulic motor/pump;
a gearing arrangement configured to selectively couple with the first shaft of the hydraulic motor/pump with the help of a first clutch, and
a flywheel coupled to the gearing arrangement, the flywheel configured to store drive power generated by the hydraulic motor/pump from the return flow of fluid when the first clutch couples the gearing arrangement with the first shaft of the hydraulic motor/pump; and
a second clutch disposed between the gearing arrangement and a second shaft associated with the prime mover of the machine, the second clutch configured to selectively couple the gearing arrangement with the second shaft, wherein the first clutch is selectively operable for facilitating a transfer of drive power from the first shaft of the hydraulic motor/pump to the flywheel via the gearing arrangement, and wherein the second clutch is selectively operable for transferring stored drive power from the flywheel to the second shaft via the gearing arrangement.

### Claim 9 (depends on 8)

The KERS of claim 8, wherein the gearing arrangement includes:
a first gear wheel rigidly mounted on a first intermediary shaft co-located with each of the first shaft associated with the hydraulic motor/pump and the second shaft associated with the prime mover, wherein the first intermediary shaft is selectively engageable to the first shaft with the help of the first clutch and is selectively engageable to the second shaft with the help of the second clutch; and
a second gear wheel disposed in rotatable engagement with the first gear wheel, the second gear wheel mounted on a second intermediary shaft.

### Claim 10 (depends on 9)

The KERS of claim 9, wherein the flywheel is mounted at an end of the second intermediary shaft.

### Claim 11 (depends on 10)

The KERS of claim 10, wherein an end of the second shaft is configured to support, at least in part, the second clutch thereon.

### Claim 12 (depends on 11)

The KERS of claim 11, wherein the second clutch is selectively operable to couple the second shaft with the second intermediary shaft.

### Claim 13 (depends on 8)

The KERS of claim 8, wherein the first clutch and the second clutch are operable independently of one another.

### Claim 14 (depends on 8)

The KERS of claim 8, wherein the hydraulic motor/pump conduit associated with the hydraulic motor/pump is configured to allow the fluid to return from each of: the swing motor and the actuator to the hydraulic motor/pump.

### Claim 15

A machine comprising:
a frame;
a body mounted on the frame and having a prime mover disposed therein;
a swing motor configured to operably rotate the body relative to the frame;
a linkage pivotally mounted on the body;
an actuator configured to operably pivot the linkage relative to the body;
a kinetic energy recovery system (KERS) operable to selectively receive drive power from a hydraulic motor/pump disposed in fluid communication with the swing motor and the actuator of the machine, and selectively transfer stored drive power to the prime mover in driving the swing motor and the actuator, wherein the KERS includes:
a KERS selection valve fluidly connected to the hydraulic motor/pump via a hydraulic motor/pump conduit, the KERS selection valve operated to:
selectively receive hydraulic energy from the swing motor via a swing-motor conduit and the actuator via an actuator conduit, the actuator conduit being separate from the swing-motor conduit, when the hydraulic motor/pump is actuated as a hydraulic motor; and
selectively supply hydraulic energy to the swing motor via the swing-motor conduit and to the actuator via the actuator conduit when the hydraulic motor/pump is actuated as a hydraulic pump;
the hydraulic motor/pump being disposed in fluid communication with a fluid source via a fluid source conduit, the hydraulic motor/pump configured to output pressurized fluid via the hydraulic motor/pump conduit for operating the swing motor and the actuator based on the selective operation of the KERS selection valve, wherein a first shaft operably and mechanically attached to the hydraulic motor/pump is configured to be operatively rotated by a flow of fluid returning, via the KERS selection valve, at least one of: the swing motor and the actuator back to the fluid source via the hydraulic motor/pump;
a flywheel configured to selectively couple with the first shaft of the hydraulic motor/pump with the help of a first clutch, the flywheel configured to store drive power generated by the hydraulic motor/pump from the return flow of fluid when the first clutch couples the flywheel with the first shaft of the hydraulic motor/pump; and
a gearing arrangement coupled to the flywheel and configured to selectively engage with a second shaft associated with the prime mover of the machine, the gearing arrangement being selectively engaged to the second shaft with the help of a second clutch, wherein the first clutch is selectively operable for facilitating a transfer of drive power from the first shaft of the hydraulic motor/pump to the flywheel, and wherein the second clutch is selectively operable for transferring stored drive power from the flywheel to the second shaft associated with the prime mover.

### Claim 16 (depends on 15)

The machine of claim 15, wherein the flywheel is mounted on a first intermediary shaft that is co-located with the first shaft and configured to support, at least in part, the first clutch thereon.

### Claim 17 (depends on 16)

The machine of claim 16, wherein the gearing arrangement includes:
a first gear wheel rigidly mounted to an end of the first intermediary shaft; and
a second gear wheel disposed in rotatable engagement with the first gear wheel, the second gear wheel mounted on a second intermediary shaft co-located with the second shaft associated with the prime mover.

### Claim 18 (depends on 17)

The machine of claim 17, wherein an end of the second shaft is configured to support, at least in part, the second clutch thereon, and wherein the second clutch is selectively operable to couple the second shaft with the second intermediary shaft.

### Claim 19 (depends on 15)

The machine of claim 15, wherein the first clutch and the second clutch are operable independently of one another.