I hope GM must recall Buick Envision - Page 2 - Buick Envision Forum
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post #11 of 62 (permalink) Old 07-21-2017, 11:40 AM
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Quote:
Originally Posted by NormT View Post
What is really clear is that your testing method is flawed. The split-type bushing was designed to used on a control arm that has other mounting points and support.

For a through test, mount the control arm on the vehicle then stress test it.

Besides, the fender is dented which means this vehicle was in an accident and components replaced before considered road worthy.
The lower control arm is installed on a carframe in the test:you can see it!and to simulate the strength!From the test,we can find before lower control arm deformation,bushing's sleeve first plastic deformation!
Why?Because,inner sleeve show it is mechanical strength shortage!
I told you a truth:In August 2015,in homepage of China's patent offices,We find a patent of bushing for SGM(GM),in the patent ,GM recognize that split-type bushing is potential safety hazard for lower contrl arm!So them change the design! And design a new bushing!It is applied on XT5 later!It is named the monocoque bushing for lower control arm!
You can see attachments!
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File Type: jpg 22.jpg (204.4 KB, 12 views)

Last edited by envisionuser; 07-21-2017 at 11:43 AM.
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post #12 of 62 (permalink) Old 07-21-2017, 11:50 AM
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Quote:
Originally Posted by NormT View Post
What is really clear is that your testing method is flawed. The split-type bushing was designed to used on a control arm that has other mounting points and support.

For a through test, mount the control arm on the vehicle then stress test it.

Besides, the fender is dented which means this vehicle was in an accident and components replaced before considered road worthy.
You can see picture of lower control arm for Cadillac XT5
Attached Images
File Type: jpg 22-1.jpg (251.1 KB, 9 views)
File Type: jpg XT5.jpg (121.9 KB, 8 views)
File Type: jpg 3.jpg (508.3 KB, 8 views)
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post #13 of 62 (permalink) Old 07-21-2017, 12:07 PM
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In China,Envision User have to strengthen to resist the risk of falls off !
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File Type: jpg akwjg1.jpg (30.2 KB, 8 views)
File Type: jpg akwjg3.jpg (20.1 KB, 9 views)
File Type: jpg akwjg6.jpg (47.9 KB, 8 views)
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post #14 of 62 (permalink) Old 07-21-2017, 12:19 PM
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From analysys,we draw conclusion that split-type bushing is insufficient intensity VS Solid one-piece bushing!
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File Type: jpg analysis-2.jpg (408.0 KB, 6 views)
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post #15 of 62 (permalink) Old 07-21-2017, 12:33 PM
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Quote:
Originally Posted by NormT View Post
What is really clear is that your testing method is flawed. The split-type bushing was designed to used on a control arm that has other mounting points and support.

For a through test, mount the control arm on the vehicle then stress test it.

Besides, the fender is dented which means this vehicle was in an accident and components replaced before considered road worthy.
You can see below video,In video,show a Envision's lower control arm closed to falls off!Less than 10 km,just Brush touch the wheels at the stairs.

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File Type: jpg QQ??20160911195219.jpg (43.0 KB, 4 views)
File Type: jpg QQ??20160911195235.jpg (74.7 KB, 3 views)
File Type: jpg QQ??20160911195230.jpg (47.3 KB, 4 views)
File Type: jpg QQ??20160911195240.jpg (35.1 KB, 4 views)
File Type: jpg QQ??20160911195245.jpg (35.9 KB, 4 views)
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post #16 of 62 (permalink) Old 07-21-2017, 12:39 PM
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In China,SDTV report Buick Envision defect problem!
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post #17 of 62 (permalink) Old 07-21-2017, 01:02 PM
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But doesn't the Chinese Envision uses a different suspension setup than the American Envision?
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post #18 of 62 (permalink) Old 07-21-2017, 09:13 PM
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But doesn't the Chinese Envision uses a different suspension setup than the American Envision?
Chinese Envision uses the macpherson front suspension,and American Envision uses enhancement macpherson front suspension,but all use same front bushing on lower control arm.Please see attaments picture.

picutre 1 is american Envision lower control arm and picture 2 is a Chinese Envision lower control arm.
You can see same architecture of bushing!So same problem with us!
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File Type: jpg 500_wKjB0FljLsqAKQX7AAKJiKho2M8040.jpg (43.2 KB, 12 views)
File Type: jpg [email protected]_recompress.jpg (67.0 KB, 9 views)
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post #19 of 62 (permalink) Old 07-21-2017, 09:16 PM
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But doesn't the Chinese Envision uses a different suspension setup than the American Envision?
And American Envision 2017 use same suspension setup with Chinese Envision!Please see attaments picture!
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File Type: png f97bc5602e4e2d83b3818a146d888549.png (82.3 KB, 5 views)
File Type: png 222c91270d8d9a8130627c71a7cdcda6.png (14.6 KB, 5 views)
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post #20 of 62 (permalink) Old 07-22-2017, 10:22 PM
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Quote:
Originally Posted by NormT View Post
What is really clear is that your testing method is flawed. The split-type bushing was designed to used on a control arm that has other mounting points and support.

For a through test, mount the control arm on the vehicle then stress test it.

Besides, the fender is dented which means this vehicle was in an accident and components replaced before considered road worthy.
Tell you a case:A Benz C200 low speed 10 km,it's vehicle wheel got slightly scratched a other Buick Envison's right wheel,C200 is ok,but Envision's right lower control arm falls off!See Picture.
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