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Click Gear Joint
in the Kinematics Joints toolbar or select Insert > New
Joint > Gear... from the Menu bar. The Joint Creation: Gear
dialog box appears.
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The Mechanism is identified in the specification
tree. |
Now you need to select two Revolute joints. |
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Select Revolute.1 either in the specification tree or in
the geometry area.
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Create Revolute.2 within the Gear command. For this:
click .The Joint
Creation: Revolute dialog box appears automatically:
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Select line .1 (green cylinder axis) and
line.2 (orange cylinder axis) as shown below in the geometry
area: |
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Select plane.1 (green cylinder face) and
plane.2 (orange cylinder face) either in the specification tree or in
the geometry area: |
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Select the Offset option button and keep the
default value. When done, click Ok.
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Assign a command, select for instance the Angle
driven for revolute1 check box.
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About Ratio definition
Two methods are available to define the ratio
parameter:
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- using the Define option in the joint
creation dialog box to calculate the ratio automatically
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Click
to define the ratio
parameter automatically. The Gear Ratio Definition dialog box
is automatically displayed.
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Select the two circles in the geometry area.
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Click Ok when done
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The calculated ratio appears in the Joint Creation:
Gear dialog box
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Change the rotation direction option if needed.
The default is Same (positive)
Opposite is negative
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Note: simulate your mechanism with
commands to check the direction is the one you want |
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Click Ok when done
Now, if you use the formula
editor, (a formula is already defined in our sample), from step 6
Right-click in the ratio field and use the Edit
Formula contextual menu displayed |
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The Formula Editor: Ratio is automatically displayed.
Click Gear1 product in the specification tree and select the radius
as shown below: |
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The formula is automatically entered in the ratio field, enter a
/ (division symbol) Click Gear 2 and select radius.2 as
shown below: |
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Click Ok when done. The ratio is updated
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The gear joint is created and identified in the
specification tree.
Now expand the gear joint you have just created, the embedded leaf
joints are displayed.
Note: the joints involved in a compound
joint can be neither edited nor deleted directly.
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Open the
GearV5_Result.CATProduct to check your result
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Note: To create a gear joint, the two
revolute joints involved in the gear joint must rely on a same
support part.
See picture below: (P stands for Part, R for
Revolute) |
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