ISO 12003-1:2021 農林業用トラクター—狭いトラクターのロールオーバー保護構造—パート1：フロントマウントROPS | ページ 6

3.1

roll-over protective structure

ROPS

framework protecting drivers of agricultural tractors, which minimizes the likelihood of driver injury resulting from accidental overturning during normal field work

Note 1 to entry: The ROPS is characterized by the provision of space for a clearance zone, either inside the envelope of the structure or within a space bounded by a series of straight lines from the outer edges of the structure to any part of the tractor that might come into contact with the ground; it is capable of supporting the tractor in an overturned position.

3.2

front-mounted ROPS

two-post roll-over protective structure (3.1) mounted on the tractor in front of the driver and with a reduced clearance zone

Note 1 to entry: Compare with rear-mounted ROPS described in ISO 12003-2.

3.3

unballasted mass

mass of the tractor in working order with tanks and radiators full, roll-over protective structure (3.1) with cladding and any track equipment or additional front-wheel drive components required for normal use

Note 1 to entry: Not included are the operator, optional ballast weights, additional wheel equipment, special equipment and loads.

[SOURCE:ISO 5700:2013, 3.2]

3.4

maximum permissible mass

m_max

maximum mass of the tractor stated by the manufacturer to be technically permissible and declared on the vehicle’s identification plate and/or in the operator’s handbook

3.5

reference mass

m_t

mass, not less than the maximum unballasted mass (3.3) , selected by the manufacturer for calculation of loading energies and forces to be applied in the tests

3.6

mass ratio

m_r

3.7

reference plane

vertical plane, generally longitudinal to the tractor and passing through the seat index point and the steering-wheel centre

Note 1 to entry: Normally, this reference plane coincides with the longitudinal median plane of the tractor.

3.8

longitudinal median plane

median longitudinal plane

symmetric longitudinal plane

Note 1 to entry: The mid-plane of the dual wheels being equidistant from the inner edge of one wheel and the outer edge of the other, the straight line Δ is, in this particular case, the intersection of the mid-plane of the dual wheels and the vertical plane passing through the axis of the axle pin.

Note 2 to entry: Adapted from ISO 612:1978, Clause 5 ^[1].

Note 3 to entry: The longitudinal median plane may also be applied to track-laying tractors.

Note 4 to entry: See Figure 1.

[SOURCE:ISO 5700:2013, 3.8]

3.9

track

tread

distance at ground level between two vertical planes passing through the centreline of ground contact of the tires parallel to the longitudinal median plane (3.8) of the tractor with the wheels in the straight-ahead position

Note 1 to entry: In the case of dual wheels, it is the distance at ground level between two planes passing through the centreline of the dual wheels. In the case of track-laying tractors, it is the distance between the two vertical planes passing through the centreline of ground contact of the tracks.

Note 2 to entry: See Figure 2.

[SOURCE:ISO 789-13:2018, 3.3]

3.10

wheelbase

distance at ground level between two vertical planes passing through the centres of the front wheels and the rear wheels with tractor and wheels in the same straight-ahead position

Note 1 to entry: See Figure 2.

[SOURCE:ISO 789-13:2018, 3.2]

3.11

rear fixture

component such as the rear tyre (measured at its specified smallest diameter), mudguard or other rigid tractor components, or all of these, or a supplementary fixture of requisite width, height and strength installed behind the driver's seat, which completes the front-mounted ROPS' (3.2) clearance zone for strength testing

3.12

horizontal loading test

application of a horizontal load to the rear, front and side of the roll-over protective structure (3.1)

3.13

crushing test

application of a vertical static load through a beam placed laterally across the uppermost members of the front-mounted ROPS (3.2)

3.14

impact test

application of a dynamic load produced by a block acting as a pendulum

3.15

foldable ROPS

two-post roll-over protective structure (3.1) with hand raising/lowering directly managed by the operator (with or without partial assistance)

3.16

agricultural tractor

self-propelled agricultural vehicle having at least two axles and wheels, or endless tracks, particularly designed to pull agricultural trailers and pull, push, carry and operate implements used for agricultural work (including forestry work), which may be provided with a detachable loading platform

Note 1 to entry: The agricultural vehicle has a maximum design speed of not less than 6 km/h and may be equipped with one or more seats.

[SOURCE:ISO 12934:2013, 3.1]

3.17

hand-operated foldable ROPS

front mounted dual pillar protective structure with hand raising/lowering directly managed by the operator (with or without partial assistance)

3.18

automated foldable ROPS

front mounted dual pillar protective structure with full assisted raising/lowering operations

3.19

locking system

device fitted to lock, by hand or automatically, the ROPS in the raised or lowered positions

3.20

grasping area

portion of the ROPS and/or additional handle fitted to the ROPS where the operator is allowed to carry out the raising/lowering operations

3.21

accessible part of the grasping area

area where the ROPS is handled by the operator during the raising/lowering operations

Note 1 to entry: This area shall be defined with regard to the geometric center of cross sections of the grasping area.

3.22

accessible zone

volume where a standing operator can apply a force in order to raise/lower the ROPS

3.23

pinching

dangerous point where parts move in relation to each other or to fixed parts in such a way as may cause persons or certain parts of their bodies to be pinched

3.24

shear

dangerous point where parts move along each other or along other parts in such a way as may cause persons or certain parts of their bodies to be pinched or shorn

3.25

static friction

force that resists initiation of movement of one surface sliding over another surface

Note 1 to entry: The force required to initiate movement is equal to that which resists initiation of movement.

[SOURCE:ISO 15359:1999, 3.2]

3.26

dynamic friction

force that resists maintained sliding of one surface over another surface

Note 1 to entry: The force required to maintain sliding is equal to that which resists the maintenance of sliding.

[SOURCE:ISO 15359:1999, 3.4, modified — The original term was"kinetic friction".]