# US 11,078,871 B2 · Thrust reverser system with cascades

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- Number: US 11,078,871 B2
- Document ID: US11078871B2
- Status: Granted
- Kind: B2
- Application number: 16/230,133
- Filed: 2018-12-21
- Published: 2020-06-25
- Granted: 2021-08-03
- Earliest claimed: 2018-12-21
- Assignees: Rohr, Inc.
- Applicants: Rohr, Inc.
- Inventors: Radhakrishna Chilukuri
- Web page: https://patentgrep.com/patent/US11078871B2

## CPC

- F02K 1/72: the aft end of the fan housing being movable to uncover openings in the fan housing for the reversed flow
- F02K 1/766: {with blocking systems or locking devices; Arrangement of locking devices for thrust reversers}
- F05D 2240/129: Cascades, i.e. assemblies of similar profiles acting in parallel
- Y02T 50/60: Efficient propulsion technologies, e.g. for aircraft
- F02K: JET-PROPULSION PLANTS (features of jet-propulsion plants common to gas-turbine plants, air intakes or fuel supply control of air-breathing jet-propulsion plants F02C7/00, F02C9/00)
- F05D: INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION

## Abstract

A cascade box is provided that includes a plurality of lengthwise extending side turning vanes and a plurality of forward turning vanes. Each of the plurality of lengthwise extending side turning vanes is configured to have a side turning angle. Each of the plurality of forward turning vanes is attached to respective adjacent ones of the plurality of side turning vanes, and each forward turning vane is configured to have a forward turning angle, and at least one of the forward turning vanes is configured to have a negative forward turning angle.

## Claims

### Claim 1

A cascade box, comprising:
a plurality of lengthwise extending side turning vanes, each of the plurality of lengthwise extending side turning vanes configured to have a side turning angle; and
a plurality of forward turning vanes extending laterally between and fixedly attached to respective adjacent ones of the plurality of lengthwise extending side turning vanes, wherein each of the plurality of forward turning vanes is configured to have a forward turning angle, and the forward turning angle of at least one of the plurality of forward turning vanes comprises a negative forward turning angle;
wherein the cascade box is arranged to have a plurality of lengthwise columns;
wherein each of the plurality of forward turning vanes in a respective one of the lengthwise columns has the same said forward turning angle as each other of the plurality of forward turning vanes in the respective lengthwise column;
wherein the plurality of lengthwise columns includes a first column with all the plurality of forward turning vanes within the first column configured to have a first forward turning angle, and a second column with all the plurality of forward turning vanes within the second column configured to have a second forward turning angle;
wherein the first forward turning angle is greater than the second forward turning angle;
wherein the first column is lengthwise aligned with and laterally offset from the second column;
wherein the cascade box comprises a first lateral side and a second lateral side coupled to a leading end and a trailing end;
wherein the plurality of lengthwise columns are positioned between the first lateral side and the second lateral side; and
wherein the plurality of lengthwise extending side turning vanes extend from the leading end to the trailing end.

### Claim 2 (depends on 1)

The cascade box of claim 1, wherein the first forward turning angle is a positive forward turning angle, and the second forward turning angle comprises the negative forward turning angle.

### Claim 3 (depends on 1)

The cascade box of claim 1, wherein the first forward turning angle and the second forward turning angles are both positive forward turning angles.

### Claim 4

A nacelle, comprising:
a cowl;
a plurality of cascade boxes arranged circumferentially around the nacelle; and
a translating sleeve configured to translate relative to the cowl between a closed position and an open position, the translating sleeve further configured to cover the plurality of cascade boxes in the closed position and to uncover the plurality of cascade boxes in the open position;
wherein each of the plurality of cascade boxes includes a plurality of lengthwise extending side turning vanes, each configured to have a side turning angle, and a plurality of forward turning vanes laterally between and attached to respective adjacent ones of the plurality of lengthwise extending side turning vanes, wherein each of the plurality of forward turning vanes is configured to have a forward turning angle, and the forward turning angle of at least one of the plurality of forward turning vanes is a negative forward turning angle;
wherein each of the plurality of cascade boxes is arranged to have a plurality of lengthwise columns, including a first column with all the plurality of forward turning vanes within the first column configured to have a first forward turning angle, and a second column with all the plurality of forward turning vanes within the second column configured to have a second forward turning angle;
wherein the first forward turning angle is greater than the second forward turning angle;
wherein the first column is laterally displaced from and lengthwise overlaps the second column;
wherein each of the plurality of cascade boxes comprises a first lateral side and a second lateral side coupled to a leading end and a trailing end;
wherein the plurality of lengthwise columns are positioned between the first lateral side and the second lateral side; and
wherein the plurality of lengthwise extending side turning vanes extend from the leading end to the trailing end.

### Claim 5 (depends on 4)

The nacelle of claim 4, wherein the first forward turning angle is a positive forward turning angle, and the second forward turning angle is the negative forward turning angle.

### Claim 6

A cascade box, comprising:
a plurality of lengthwise extending side turning vanes, each of the plurality of lengthwise extending side turning vanes configured to have a side turning angle; and
a plurality of forward turning vanes laterally between and connected to respective adjacent ones of the plurality of lengthwise extending side turning vanes, each of the plurality of forward turning vanes configured to have a forward turning angle;
wherein the cascade box is arranged to have a plurality of lengthwise columns;
wherein each of the plurality of forward turning vanes in a respective one of the lengthwise columns has the same said forward turning angle as each other of the plurality of forward turning vanes in the respective lengthwise column;
wherein the plurality of lengthwise columns includes a first column with all the plurality of forward turning vanes within the first column configured to have a first forward turning angle, and a second column with all the plurality of forward turning vanes within the second column configured to have a second forward turning angle;
wherein the first forward turning angle is different than the second forward turning angle;
wherein the first column lengthwise overlaps and is laterally next to the second column;
wherein the cascade box comprises a first lateral side and a second lateral side coupled to a leading end and a trailing end;
wherein the plurality of lengthwise columns are positioned between the first lateral side and the second lateral side; and
wherein the plurality of lengthwise extending side turning vanes extend from the leading end to the trailing end.

### Claim 7 (depends on 6)

The cascade box of claim 6, wherein the first forward turning angle comprises a negative forward turning angle.