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8
Although the model is fully assembled now, it is still incomplete. The Piston Head has a pin connection to the Connecting Rod. However, as it is assembled the Piston Head is free to flop around rotating about its pin connection with the Connecting Rod. The model needs to be finished by adding another connection such that the Piston Head would move up and down as if it were inside a cylinder. To do this, a cylinder joint needs to be defined between the Piston Head and Ground which is the Engine Block Bottom in this model.
If you still have the "Component Placement" dialogue box open, you may simply select Add and change the connection type to "cylinder". Otherwise select Component, Redefine, and pick the Piston Head. Select the Add button and change the type of the new connection to "cylinder". As shown in Table 1, a cylinder connection only needs an axis alignment constraint. Select the appropriate axes on the Engine Block Bottom and the Piston Head. Select Ok to complete the definition of the cylinder connection.
A "slider" connection would also work in this model. Figure 9 and 10 show this model with a "slider" connection. If you use a "cylinder" connection your model will have a "cylinder" connection icon instead.
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发表于 2002-2-16 11:07:58
发表于 2002-2-16 14:49:24
