# US 4,400,137 A · Rotor assembly and methods for securing a rotor blade therewithin and removing a rotor blade therefrom

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- Number: US 4,400,137 A
- Document ID: US4400137A
- Status: Granted
- Kind: A
- Application number: 06/221,076
- Filed: 1980-12-29
- Granted: 1983-08-23
- Earliest claimed: 1980-12-29
- Assignees: Elliott Turbomachinery Co., Inc.
- Inventors: Arthur J. Miller; Charles H. Kostors
- Web page: https://patentgrep.com/patent/US4400137A

## CPC

- F01D 5/326: {Locking of axial insertion type blades by other means}
- Y02T 50/60: Efficient propulsion technologies, e.g. for aircraft
- Y10T 29/49318: Repairing or disassembling
- F01D: NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES (machines or engines for liquids F03; non-positive displacement pumps F04D)
- Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

A rotor assembly and methods for securing rotor blades within and removing rotor blades from rotor assemblies. The rotor assembly comprises a rotor disc defining a plurality of blade grooves, and including a plurality of tenons disposed between the blade grooves and defining a plurality of pin sockets radially extending inward from outside surfaces of the tenons; and a plurality of rotor blades, each blade including a root disposed within a blade groove to secure the blade against radial movement, and a blade platform overlaying a tenon and defining a radially extending pin aperture. The rotor assembly further comprises a plurality of locking pins radially extending through the pin apertures and into the pin sockets to secure the rotor blades against axial movement, each pin including a head and a base to limit radial movement of the pin.

## Claims

### Claim 1

A rotor assembly comprising:
a rotor disc defining a plurality of blade grooves, and including a plurality of tenons disposed between the blade grooves and defining a plurality of pin sockets radially
a blade platform overlaying a tenon and defining a radially extending pin aperture aligned with the corresponding pin socket; and
a plurality of locking pins radially extending through the pin apertures to secure the rotor blades against axial movement, each pin including
a head projecting over and engaging an outside surface of a blade platform and
an expanded base engaging an inside surface of the blade platform to fix the pin with respect to the blade, and
a stem connecting the pin head and the pin base
each of the expanded bases extending into and coacting with the corresponding pin socket to prevent axial movement between the blades and the disc.

### Claim 2 (depends on 1)

A rotor assembly as defined by claim 1 wherein
the distance between the bottom of the pin socket and the inside surface of the blade platform is greater than the distance between the bottom of the pin base and the top of the pin stem.

### Claim 3 (depends on 1)

A rotor assembly as defined by claim 1 wherein:
the width of the pin socket is greater than the width of the pin aperture to facilitate moving the pin base and the pin stem into the pin socket.

### Claim 4 (depends on 2, 3)

A rotor assembly as defined by claims 2 or 3 wherein:
the outside surface of each blade platform defines a recessed portion; and
the head of each pin is disposed within a recessed portion.