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SAE J89 2014 Edition, April 1, 2014
Dynamic Cushioning Performance Criteria for Snowmobile Seats
Description / Abstract:
This SAE Recommended Practice encompasses the significant
factors which determine the effectiveness of a seat system in
limiting spinal injury during vertical impacts between the rider
and the snowmobile seat system. The document is intended to provide
a tool for the development of safer snowmobile seats. It is
recognized that the seat is only a portion of the entire vehicle
protective suspension system. It is, however, usually required that
the seat serve as added protection to the suspension system, since
the latter may "bottom out" during a severe impact.
The term "seat" refers to the occupant-supporting system not normally considered part of the vehicle suspension or frame system. In some cases, it may include more than the foam cushion.
This document provides the minimum requirements for performance of a general seat system, and a description of specific means of evaluating the shock-absorbing characteristics of foam seat cushions using a specific testing procedure and a companion seat evaluation chart.
The test input and means of interpreting the results are unique to the seats of typical recreational snowmobiles. Therefore, this document is to be used for snowmobile seats only and is not to be used to evaluate seats of any other type of vehicle. In addition, it should not be applied to seats of snow vehicles of significantly different design, dimensions, construction, or intended usage from the typical recreational snowmobile illustrated in SAE J33.
Purpose
The purpose of this document is to facilitate the development of seats used on snowmobiles to minimize occupant spinal injury during impacts of:
a. The occupant on the snowmobile seat
b. The snowmobile and seat on the occupant
Operators and passengers of snowmobiles can be subjected to high levels of impact with the snowmobile seat under riding conditions. This document was developed to identify the cushioning properties of snowmobile seats.
The term "seat" refers to the occupant-supporting system not normally considered part of the vehicle suspension or frame system. In some cases, it may include more than the foam cushion.
This document provides the minimum requirements for performance of a general seat system, and a description of specific means of evaluating the shock-absorbing characteristics of foam seat cushions using a specific testing procedure and a companion seat evaluation chart.
The test input and means of interpreting the results are unique to the seats of typical recreational snowmobiles. Therefore, this document is to be used for snowmobile seats only and is not to be used to evaluate seats of any other type of vehicle. In addition, it should not be applied to seats of snow vehicles of significantly different design, dimensions, construction, or intended usage from the typical recreational snowmobile illustrated in SAE J33.
Purpose
The purpose of this document is to facilitate the development of seats used on snowmobiles to minimize occupant spinal injury during impacts of:
a. The occupant on the snowmobile seat
b. The snowmobile and seat on the occupant
Operators and passengers of snowmobiles can be subjected to high levels of impact with the snowmobile seat under riding conditions. This document was developed to identify the cushioning properties of snowmobile seats.
SAE J89 2014 Edition, April 1, 2014
Dynamic Cushioning Performance Criteria for Snowmobile Seats