Spring return pedal is never reliable
in [Toyota]
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From: Ray O on 1 Feb 2010 13:02 "Mike Hunter" <Mikehunt2(a)lycos,com> wrote in message news:4b6703a1$0$22843$ce5e7886(a)news-radius.ptd.net... > But, but, but bearing cost more money ;) But not as much as all this nonsense will cost! -- Ray O (correct punctuation to reply) > > > "Ray O" <rokigawa(a)NOSPAMtristarassociates.com> wrote in message > news:hk5ms6$8re$1(a)news.eternal-september.org... >> >> "Georgie" <remailer(a)reece.net.au> wrote in message >> news:7AN6LJD740210.3274305556(a)reece.net.au... >>> The return mechanism for the throttle pedal must never rely >>> solely on spring force. Springs are alright as an assist, but in >>> the event of spring weakening or excessive friction, positive >>> means must be instintively available to safely return the pedal >>> to idle. >>> >>> Stuck accelerator pedals are nothing new. Earlier mechanical >>> linkages have experienced the same nasty failure mode. >>> >>> Here is what I recommend: >>> >>> 1. Redundant springs. Two springs working in tandem. If one >>> snaps or stretches, the other remains effective. >> >> The challenge with double springs is that either twice as much effort is >> needed to overcome the springs, and if the the return force is divided >> among the two springs, then if one fails, there is still insufficient >> return force to close the throttle. Of course, springs are not the cause >> of the recall/stop sale. >> >>> >>> 2. Relocate the pedal fulcrum. Instead of pivoting the pedal at >>> one end, locate the pivot at 1/3 from the lower edge. The pedal >>> then becomes a rocker design. If for some reason, it sticks, >>> heel force can be employed to rock the pedal back to engine >>> idle. Properly balanced, the pedal will normally operate with no >>> perceptible difficulty, but now failsafe. >> >> The challenge is that the pedal is suspended from above and is more like >> a pendulum so applying force on the bottom of the pedal would also open >> the throttle. Having enough space at the bottom of the pedal between the >> floor and the pedal might allow a foot to slip underneath and pull the >> pedal back out but this would probably be difficult to do in a panic >> situation, and large boots might not fit. >>> >>> 3. Use high quality, permanently lubricated ball bearings in the >>> pedal assembly for lifetime frictionless operation. >>> >> >> This would be a good idea if the bearings were also sealed against >> moisture and dirt. >> -- >> >> Ray O >> (correct punctuation to reply) >> > >
From: raamman on 1 Feb 2010 13:41 On Feb 1, 6:50 am, "Elmo P. Shagnasty" <el...(a)nastydesigns.com> wrote: > In article <7AN6LJD740210.3274305...(a)reece.net.au>, > > Georgie <remai...(a)reece.net.au> wrote: > > 3. Use high quality, permanently lubricated ball bearings in the > > pedal assembly for lifetime frictionless operation. > > And my guess is we'll find that Toyota told the supplier to "make it > cheaper"--and the supplier found a Chinese bearing, probably pot metal > that saved them three cents per assembly, that is the crux of this whole > matter. the suplier very firmly stated they made the pedal exactly to specification; I have no doubt that this is true
From: hls on 1 Feb 2010 14:20 "raamman" <raamman(a)gmail.com> wrote in message news:a72f462e-9d67-4152-a212- the suplier very firmly stated they made the pedal exactly to specification; I have no doubt that this is true ******** I have some doubts it is true.. If they had made it exactly to spec, then all of them - if they were faulty - should be expected to fail. That has not been the case. And if some of the earlier reports are true, the only pedals involved come from the ONE manufacturer... What does that suggest to you?
From: Mike Hunter on 1 Feb 2010 18:09 Are you familuer with blueprints? If you are please explain HOW you believe a supplier can NOT build to the manufactures specs and still meet the manufactures blueprint design specs? "Elmo P. Shagnasty" <elmop(a)nastydesigns.com> wrote in message news:elmop-57878C.13515901022010(a)nothing.attdns.com... > In article > <a72f462e-9d67-4152-a212-a77cfbbc86e3(a)k11g2000vbe.googlegroups.com>, > raamman <raamman(a)gmail.com> wrote: > >> > And my guess is we'll find that Toyota told the supplier to "make it >> > cheaper"--and the supplier found a Chinese bearing, probably pot metal >> > that saved them three cents per assembly, that is the crux of this >> > whole >> > matter. >> >> the suplier very firmly stated they made the pedal exactly to >> specification; I have no doubt that this is true > > the word "specification" being the sticky point here. > > "Specification" includes cost, and may not include specific materials > used. > > Or it may include materials used.
From: Mike Hunter on 1 Feb 2010 18:15
If that were true, why did Toyota continue to accept parts from that manufacture for all these years? Surely Toyota would have examined the parts to make sure they met Toyotas design criteria, when they stated to get warranty claims about uncontrolled acceleration, when the problem first appeared on Toyotas way back in 2004? "hls" <hls(a)nospam.nix> wrote in message news:k9KdnQRSZLQEtPrWnZ2dnUVZ_uCdnZ2d(a)giganews.com... > > "raamman" <raamman(a)gmail.com> wrote in message > news:a72f462e-9d67-4152-a212- > > the suplier very firmly stated they made the pedal exactly to > specification; I have no doubt that this is true > > ******** > I have some doubts it is true.. If they had made it exactly to spec, > then all of them - if they were faulty - should be expected to fail. > That has not been the case. > > And if some of the earlier reports are true, the only pedals involved > come from the ONE manufacturer... > > What does that suggest to you? |