# US 2021/0276691 A1 · Locking mechanism, propeller, motor, propulsion system assembly, and aircraft

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- Number: US 2021/0276691 A1
- Document ID: US20210276691A1
- Status: Published application
- Kind: A1
- Application number: 17/328,770
- Filed: 2021-05-24
- Published: 2021-09-09
- Earliest claimed: 2016-10-28
- Assignees: Sz Dji Technology Co., Ltd.
- Applicants: Sz Dji Technology Co., Ltd.
- Inventors: Bin JIANG; Tao DENG; Di OU
- Web page: https://patentgrep.com/patent/US20210276691A1

## CPC

- B64C 11/02: Hub construction
- A63H 27/12: {Helicopters (A63H27/04 takes precedence); Flying tops}
- B64U 50/23: with each propulsion means having an individual motor
- B64U 10/14: with four distinct rotor axes, e.g. quadcopters
- B64U 30/29: Constructional aspects of rotors or rotor supports; Arrangements thereof
- B64U 80/50: the UAVs being disassembled
- B64U 2101/30: for imaging, photography or videography
- B64C: AEROPLANES; HELICOPTERS
- A63H: TOYS, e.g. TOPS, DOLLS, HOOPS OR BUILDING BLOCKS
- B64U: UNMANNED AERIAL VEHICLES [UAV]; EQUIPMENT THEREFOR

## Abstract

A propulsion system assembly includes a propeller, a motor configured to drive the propeller to rotate, and a locking mechanism configured to detachably lock the propeller to the motor. The propeller includes one of a first body and a second body. The motor includes another one of the first body and the second body. The locking mechanism includes a coupling member including a femoral position groove, a fastener configured to fix the coupling member to the second body, and a locking member configured to lock the first body to the coupling member and the second body. A bottom portion of the first body that contacts the coupling member includes a protruding rib configured to fit with the femoral position groove to restrain the first body from rotating relative to the coupling member.

## Claims

### Claim 1

A propulsion system assembly comprising:
a propeller including one of a first body and a second body;
a motor configured to drive the propeller to rotate and including another one of the first body and the second body; and
a locking mechanism configured to detachably lock the propeller to the motor, the locking mechanism including:
a coupling member including a femoral position groove;
a fastener configured to fix the coupling member to the second body; and
a locking member configured to lock the first body to the coupling member and the second body;
wherein a bottom portion of the first body that contacts the coupling member includes a protruding rib configured to fit with the femoral position groove to restrain the first body from rotating relative to the coupling member.

### Claim 2 (depends on 1)

The propulsion system assembly of claim 1, wherein:
the fastener includes a threaded fastener;
the second body includes a first threaded hole configured to fit with the fastener; and
the coupling member includes a second threaded hole configured to fit with the fastener.

### Claim 3 (depends on 2)

The propulsion system assembly of claim 2, wherein:
the first body includes a blocking member disposed at the bottom portion of the first body and protruding from the bottom portion.

### Claim 4 (depends on 3)

The propulsion system assembly of claim 3, wherein:
the blocking member is disposed at an opening location of the second threaded hole to block a free end of the fastener to restrain the fastener from falling out from the opening location of the second threaded hole.

### Claim 5 (depends on 4)

The propulsion system assembly of claim 4, wherein:
a distance between a bottom portion of the blocking member and the free end of the fastener is smaller than a depth by which the fastener is inserted into the first threaded hole.

### Claim 6 (depends on 4)

The propulsion system assembly of claim 4, wherein:
a bottom portion of the blocking member is configured to directly abut against the free end of the fastener to limit a moving space of the fastener.

### Claim 7 (depends on 1)

The propulsion system assembly of claim 1, wherein:
the locking member includes locking parts located at at least two sides of the locking member and configured to lock the first body and the coupling member with the second body from at least two locations or directions.

### Claim 8 (depends on 7)

The propulsion system assembly of claim 7, wherein each of the locking parts includes:
a first lock catch end configured to lock the first body;
a second lock catch end configured to lock the second body; and
a third lock catch end configured to lock the coupling member and the first body.

### Claim 9 (depends on 8)

The propulsion system assembly of claim 8, wherein for each of the locking parts:
the first lock catch end and the second lock catch end are located at an upper end and a lower end of the locking part; and
the third lock catch end is disposed between the first lock catch end and the second lock catch end.

### Claim 10 (depends on 8)

The propulsion system assembly of claim 8, wherein:
the first lock catch end includes a first groove;
the second lock catch end includes a second groove; and
openings of the first groove and the second groove have opposite directions.

### Claim 11 (depends on 10)

The propulsion system assembly of claim 10, wherein:
the first groove is configured to apply a downward pressing force on the first body; and
the second groove is configured to apply an upward pulling force on the second body.

### Claim 12 (depends on 8)

The propulsion system assembly of claim 8, wherein:
the third catch end includes a protrusion configured to abut with the coupling member to further lock the first body and the coupling member.

### Claim 13 (depends on 12)

The propulsion system assembly of claim 12, wherein:
the coupling member includes a receiving space configured to receive the protrusion.

### Claim 14 (depends on 1)

The propulsion system assembly of claim 1, wherein
the motor includes an outer rotor;
the propeller includes a propeller hub and a blade mounted to the propeller hub;
the first body is one of:
the propeller hub; and
the outer rotor of the motor or an adapter provided on the outer rotor of the motor; and
the second body is another one of:
the propeller hub; and
the outer rotor of the motor or the adapter provided on the outer rotor of the motor.

### Claim 15 (depends on 14)

The propulsion system assembly of claim 14, wherein the propeller hub includes a driving groove configured to fit with a driving shaft of the motor.

### Claim 16

An aircraft, comprising:
an aircraft body; and
a propulsion system assembly, including:
a propeller including one of a first body and a second body;
a motor configured to drive the propeller to rotate and including another one of the first body and the second body; and
a locking mechanism configured to detachably lock the propeller to the motor, the locking mechanism including:
a coupling member including a femoral position groove;
a fastener configured to fix the coupling member to the second body; and
a locking member configured to lock the first body to the coupling member and the second body;
wherein a bottom portion of the first body that contacts the coupling member includes a protruding rib configured to fit with the femoral position groove to restrain the first body from rotating relative to the coupling member.

### Claim 17 (depends on 16)

The aircraft of claim 16, wherein:
the fastener includes a threaded fastener;
the second body includes a first threaded hole configured to fit with the fastener; and
the coupling member includes a second threaded hole configured to fit with the fastener.

### Claim 18 (depends on 17)

The aircraft of claim 17, wherein:
the first body includes a blocking member disposed at the bottom portion of the first body and protruding from the bottom portion.

### Claim 19 (depends on 18)

The aircraft of claim 18, wherein:
the blocking member is disposed at an opening location of the second threaded hole to block a free end of the fastener to restrain the fastener from falling out from the opening location of the second threaded hole.

### Claim 20 (depends on 19)

The aircraft of claim 19, wherein:
a distance between a bottom portion of the blocking member and the free end of the fastener is smaller than a depth by which the fastener is inserted into the first threaded hole.