Introduced here are some examples of connecting two machine elements together. We have discussed some connection methods for rotating shafts. Here, the discussions will cover some cases on connecting two elements where one is stationary and the other will be moveable.

(1) Connecting Hinge Pins

(1) What is a Hinge?

A hinge is a mechanical element composed of two parts where one is fixed stationary and the other is able to pivot freely. A hinge can be configured using Hinge Pins.

(2) Connecting methods using Hinge Pins.

There are following types.

The Hinge Pins are manufactured with "g6" O.D. tolerance. Mating bores should be made with H7 tolerance to achieve "Slip Fit" connections.

(3) Hints on selecting the connection methods

Evaluate the following check list against the applicable mechanism characteristics to select a proper connection method.

a) The hinge pin and axial force relationship

Hinge pin retaining strength against the axial force would be as follows.
(Low strength) Cotter pin < Retaining ring < Retaining screw < Nut retained < Female thread < Key retained (High strength)

b）Hinge pin replacement frequency

Cotter pins are one-time use only, cannot be reused.
Key retained type is somewhat cumbersome to work on.
Other methods render for easy replacement.

c) An end of the hinge pin can be grasped or not.

If an end of the hinge pin cannot be grasped due to design constraints or there is a width constraints, the retaining screws or the key retained types can be employed.

(4) Cautionary points on connecting.

・

When using cotter pins, bend the pin at a proper length to avoid snagging on the rotation section.

Connection methods for linear motion components, next.