Tài liệu ECCENTRIC MECHANISM OF FOUR-BAR LINKAGE pptx
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ECCENTRIC MECHANISM
OF FOUR-BAR LINKAGE
1
ME-430 INTRODUCTION TO COMPUTER AIDED DESIGN
ECCENTRIC MECHANISM OF FOUR-BAR LINKAGE
Pro/ENGINEER Wildfire 2.0
Dr. Herli Surjanhata
A component can be placed as a connection within mechanism assembly. The
following six joint types are available:
Pin Joint
2
Cylinder Joint
Planar Joint
3
Slider Joint
Ball Joint
4
Bearing Joint
PREPARE THE PARTS FOR MECHANISM
Download the part files eccentric_mechanism.zip. There are eleven parts that
make up the mechanism:
1 arm.prt 7 eccentric.prt
2 base.prt 8 post.prt
3 bushing.prt 9 shaft.prt
4 clip-1.prt 10 washer-1.prt
5 clip-2.prt 11 washer-2.prt
6 link.prt
5
arm.prt base.prt
bushing.prt eccentric.prt
6
post.prt shaft.prt
clip-1.prt clip-2.prt
7
washer-1.prt washer-2.prt
link.prt
CREATE AN SUB-ASSEMBLY eccentric_asm.asm
Sub-assembly called eccentric_asm.asm will be consisted of six component parts –
eccentric, shaft, clip-1, clip-2, washer-1, and washer-2.
Create a new assembly called ECCENTRIC_ASM
8
Bring in eccentric.prt and constrain
it at default location by picking
.
Pick
, then Open
eccentric.prt.
The assembly is shown below.
Next, place shaft.prt to the assembly. Pick
, then Open shaft.prt.
Pick the axis of the shaft, then select the axis of the center hole of the eccentric.
9
Pick the surfaces as shown below.
10
Be sure to enter 0 when prompted with
offset distance.
If necessary, click
to flip the
orientation of the shaft.
The resulted assembly is shown below.
Mate both surfaces
11
Click
. Then open clip-2.prt. Place clip-2 in the groove of the shaft as shown
below.
Place washer-2.prt right behind clip-2 as shown below.
12
Open clip-1.prt and place it in the groove of the pin of eccentric part – see figure
below.
13
Place washer-1.prt right behind clip-1 – see figure below.
14
The resulted assembly is shown below.
15
Perform Global Interference check of the assembly. Make sure there is no
interference in the assembly.
Analysis -> Model Analysis
Choose Global Interference under
Type.
Click
.
There are NO interference parts in the assembly.
Save the assembly.
16
CREATE AN SUB-ASSEMBLY base_asm.asm
Click ,
Enter the name of base_asm.
OK.
Click
. Then open base.prt and assemble it at default location by selecting .
17
Click
, and open bushing.prt. Place the bushing at the most left hole in the
base – see figure below.
18
Place again the bushing into the hole located on the right of the base.
Hint: Use Repeat option of the assembly.
Edit -> Repeat etc.
Click
, and open post.prt. Place the post at the most left hole in the base – see
figure below.
19
Perform the Global Interference check and make sure there are NO interference.
20
Save the assembly.
CREATE AN SUB-ASSEMBLY arm_asm.asm
Click
,
Enter the name of arm_asm.
OK.
21
Click
. Then open arm.prt and assemble it at default location by selecting .
Open clip-1.prt and place it in the groove of the pin of arm part – see figure below.
22
Place washer-1.prt right behind clip-1 – see figure below.
23
The resulted assembly is shown below.
24
CREATE AN TOTAL ASSEMBLY eccentric_mechanism.asm
Click
,
Enter the name of
eccentric_mechanism.
OK.
Click
. Then open sub-assembly base_asm.asm and assemble it at default
location by selecting
.
