Industrial trucks - Verification of stability-Part 17 : Towing tractors , burden and personnel carriers
1 Scope
This document specifies the tests for verifying the stability of towing tractors, burden and personnel carriers as defined in ISO 5053-1.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB/T 8420-2011 Earth-moving machinery - Physical dimensions of operators and minimum operator space envelope (ISO 3411:2007, IDT)
ISO 5053-1 Industrial trucks- Vocabulary- Part 1: Types of industrial trucks
Note: GB/T 6104.1-2018 Industrial trucks -Terminology and classification - Part 1 : Types of industrial trucks (ISO 5053-1:2015, IDT)
ISO 5353:1995 Earth moving machinery, and tractors and machinery for agriculture and forestry - Seat index point
Note: GB/T 8591-2000 Earth-moving machinery-Seat index point (eqv ISO 5353:1995)
ISO 22915-1 Industrial trucks- -Verification of stability - Part 1 : General
Note: GB/T 26949.1-2020 Industrial trucks - Verification of stability - Part 1 : General (ISO 22915-1:2016, IDT)
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 5053-1 and ISO 22915-1 apply.
4 Test conditions
4.1 General
The requirements of ISO 22915-1 shall apply.
If the truck can travel with an elevating operator position, an additional test shall be performed at the maximum height. If a device automatically limits the travel speed, this reduced speed shall be used when determining the angle of the tilt table.
4.2 Operating conditions
In addition to the requirements of ISO 22915-1, the truck to be tested shall reflect its operating weight and shall include all options and accessory items approved by the truck manufacturer which, when installed, will decrease the stability of the truck.
4.3 Test load
4.3.1 General
The test load for carriers shall consist of a load corresponding to 4.3.2 or 4.3.3.
Towing tractors with a load platform shall be tested according to the method as defined for burden carriers (see 4.3.2).
4.3.2 Burden carriers
The test load shall be placed on the load bed of the carrier and secured such that the centre of gravity, G, is directly above the geometric centreline of the load bed.
The minimum height of the centre of gravity, G, shall be 600 mm above the load bed (see Figure 1) or as defined by the manufacturer.
The centre of gravity, G, defined by the manufacturer shall be indicated on the information plate.
The longitudinal position of the centre of gravity, G, shall be half of the length of the load bed.
Manufacturers may define a load distribution plan to allow various combinations of load and load position on the load bed. The requirement above includes all tests that are necessary to verify the stability for each defined load arrangement.
4.3.3 Personnel carriers
Personnel carriers shall be tested in the conditions of least stability with respect to the number and location of passengers. If provided, seats shall be adjusted to the mid-point adjustment position of seats in each test.
Each passenger shall be simulated by an object having a mass of 114.1 kg corresponding to a large size operator, in accordance with GB/T 8420-2011, Clause 4. Objects simulating passengers and operator shall be secured to their respective position or seats.
The centre of gravity of the object shall be positioned 150 mm above the seat index point (SIP), as determined in accordance with ISO 5353 : 1995, 5.3.
4.3.4 Steer and rear axles
The steer and rear axles are defined by Figure 2.
4.3.5 Tests 1 and 2
The truck shall be positioned on the tilt table with the line M-N parallel to the tilt axis, X-Y, of the tilt table. The steered wheel(s) shall be turned so that it is parallel with the tilt axis, X-Y, (see Table 1).
Point M is defined as follows.
a) For trucks steered by a single wheel: point M shall be the centre point of the tread contact area between the steer wheel and the tilt table surface.
b) For trucks steered by twin wheels: point M shall be the centre point of the tread contact area between the steer wheel closest to the tilt axis, X-Y, of the tilt table and the tilt table surface.
c) For trucks steered by two wheels: point M shall be the centre point of the tread contact area between the steer wheel closest to the tilt axis, X-Y, of the tilt table and the tilt table surface.
Point N is defined as the centre point of the area of contact between the tilt table surface and the rear wheel nearest to the tilting axis. On trucks with more than one rear axle, the axle nearest to the steer axle shall be used.
4.3.6 Tests 3, 4, 5 and 6
As shown in Table 1, the truck shall be placed on the tilting platform such that the longitudinal centre plane A-A is perpendicular to the tilt axis, X-Y, of the tilt table.
The axle of the steered wheel(s) shall be parallel to the tilt axis, X-Y, of the tilt table.
Note: Tests 3 and 5 are not applicable for towing tractors without a load platform.
