Spring return pedal is never reliable
in [Toyota]
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From: Mike Hunter on 1 Feb 2010 18:49 Industry analysts are saying it will cost Toyota billions over the next few years. "Ray O" <rokigawa(a)NOSPAMtristarassociates.com> wrote in message news:hk7590$pik$1(a)news.eternal-september.org... > > "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: Hachiroku ハチロク on 1 Feb 2010 14:25 On Mon, 01 Feb 2010 13:20:54 -0600, hls wrote: > > "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? Encapsulate it in Mercury and paint it with red lead paint. Better living through Chinestry...
From: Hachiroku ハチロク on 1 Feb 2010 14:26 On Mon, 01 Feb 2010 12:02:36 -0600, Ray O wrote: > > "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! About right... Back in 1981, IBM had the option of a single-direction parallel port for their PC, or a bi-directional port. The bi-directional port cost 8 cents per unit more. IBM went with the unidirectional port. But, who was saving the 8 cents in this case? (I think we know I'd like to think the supplier...)
From: Canuck57 on 1 Feb 2010 20:13 On 01/02/2010 4:50 AM, Elmo P. Shagnasty wrote: > In article<7AN6LJD740210.3274305556(a)reece.net.au>, > Georgie<remailer(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. Looks like GM & Ford have also used these parts and only GM isn't actively recalling them. As someone else said, GM didn't make the Vibe.... Well GM didn't make a lot of their stuff including the Aveo. Looks like Ford and Toyota are going to make good. To make a mistake is one thing, to fix it shows integrity.
From: Canuck57 on 1 Feb 2010 20:14
On 01/02/2010 11:41 AM, raamman wrote: > 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 But to who's specifications? I ask as Toyota, Ford and GM have used them. Perhaps more as the story unfolds. |