Commercial Vehicle Safety Alliance

Date d’inscription	14 mars 2011
Numéro de l’enjeu	11-016-VEH
Nom	Kerri Wirachowsky
Organisme	Ontario Ministry of Transportation
Adresse	301 St. Paul StreetSt Catharines, ON, L2R 4R7CanadaVoir sur la carte (s’ouvre dans un nouvel onglet)
Téléphone	905-704-2507
Télécopieur	(905) 704-2467
Courriel	[email protected]
Comité	Comité des véhicules
État	Fermé
Résumé de l’enjeu	Les photos ci-jointes montrent un support secondaire fixé à l'essieu et qui semble supporter l'arbre à cames. Il arrive souvent que les boulons en U qui fixent les supports soient desserrés ou que la soudure à l'essieu présente des fissures.
Justification ou besoin	Certains agents signalent un problème de support d'arbre à cames desserré ou cassé. S'agit-il bien d'un support d'arbre à cames et doit-il être traité de la même manière que le support principal ou le tube généralement présent sur un système de freinage à cames en S ?
Demande d’action	Précisez l'objectif de cette tranche et indiquez si elle doit être incluse dans les critères des 20 % comme composante de danger imminent.
Mesures prises par le comité	A presentation regarding this issue request was done. It was explained that some inspectors are referring to the brackets as cam shaft support brackets. The bracket does go around the cam shaft tube or the cam shaft, so the brake manufacturers were asked if this should be included in the 20% brake criteria and treated as a cam shaft support bracket or was there other terminology that should be added. These brackets are often found loose or cracked at the weld connecting it to the axle. There had been several emails back and forth between the brake manufacturers and the chairman prior to the meeting. These were shown and included in the attachment package for the meeting. Information presented outlined that the purpose of this bracket is to provide localized reinforcement to the cam tube assembly. The location and design varies based on brake design and application. These brackets can be steel plate pieces that are welded between cam tube, wing brackets or mounting plates. They can be 1 or more pieces added to the assembly. The position is based on overall brake dynamic conditions and can be special clamps (existing exhaust u-bolt bracket or special designs) that are then anchored between the brake and other vehicle components. It was concluded that these should be considered a maintenance issue only. These are not the primary support of the cam shaft, but rather a secondary support. They are not required to assist with normal braking action and another brake component would have to fail (already covered in the criteria) before braking action was affected. Based on the information provided by the brake manufacturers, it was determined that these are not part of the 20% criteria and should not be added, therefore no action was taken and the issue was closed.

Date d’inscription

14 mars 2011

Numéro de l’enjeu

11-016-VEH

Nom

Kerri Wirachowsky

Organisme

Ontario Ministry of Transportation

Adresse

301 St. Paul StreetSt Catharines, ON, L2R 4R7CanadaVoir sur la carte

Téléphone

905-704-2507

Télécopieur

(905) 704-2467

Courriel

[email protected]

Comité

Comité des véhicules

État

Fermé

Résumé de l’enjeu

Les photos ci-jointes montrent un support secondaire fixé à l'essieu et qui semble supporter l'arbre à cames. Il arrive souvent que les boulons en U qui fixent les supports soient desserrés ou que la soudure à l'essieu présente des fissures.

Justification ou besoin

Certains agents signalent un problème de support d'arbre à cames desserré ou cassé. S'agit-il bien d'un support d'arbre à cames et doit-il être traité de la même manière que le support principal ou le tube généralement présent sur un système de freinage à cames en S ?

Demande d’action

Précisez l'objectif de cette tranche et indiquez si elle doit être incluse dans les critères des 20 % comme composante de danger imminent.

Mesures prises par le comité

A presentation regarding this issue request was done. It was explained that some inspectors are referring to the brackets as cam shaft support brackets. The bracket does go around the cam shaft tube or the cam shaft, so the brake manufacturers were asked if this should be included in the 20% brake criteria and treated as a cam shaft support bracket or was there other terminology that should be added. These brackets are often found loose or cracked at the weld connecting it to the axle. There had been several emails back and forth between the brake manufacturers and the chairman prior to the meeting. These were shown and included in the attachment package for the meeting.

Information presented outlined that the purpose of this bracket is to provide localized reinforcement to the cam tube assembly. The location and design varies based on brake design and application. These brackets can be steel plate pieces that are welded between cam tube, wing brackets or mounting plates. They can be 1 or more pieces added to the assembly. The position is based on overall brake dynamic conditions and can be special clamps (existing exhaust u-bolt bracket or special designs) that are then anchored between the brake and other vehicle components.

It was concluded that these should be considered a maintenance issue only. These are not the primary support of the cam shaft, but rather a secondary support. They are not required to assist with normal braking action and another brake component would have to fail (already covered in the criteria) before braking action was affected.

Based on the information provided by the brake manufacturers, it was determined that these are not part of the 20% criteria and should not be added, therefore no action was taken and the issue was closed.

OOSC, Partie II, Article 1. systèmes de freinage, a. Freins défectueux, (2)(b) - Supports d'arbre à cames