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المملكــة العربيــــة السعوديـــةKINGDOM OF SAUDI ARABIA

الهيـئــة السعوديــة للمواصفــات والمقايـيـس والجــودةSaudi Standards, Metrology and Quality Org.(SASO)

ديةالمواصفات القياسية السعو

SAUDI STANDARDS

SASO ISO 8848/2012ISO 8848:1990

٨٨٤٨/٢٠١٢م ق س أيزو ISO 8848:1990

أنظمة التوجيه عن بعد–الصغيرة ) المراآب (القوارب

Small craft -- Remote steering systems

تقديم وطني

ية ية الدول ي المواصفة القياس يس بتبن سعودية للمواصفات والمقاي ربية ال ئة الع ت الهي قام :التالية دون إدخال أي تعديلات فنية عليها

ISO 8848:1990 "بعد أنظمة التوجيه عن –الصغيرة ) المراآب (القوارب"

NATIONAL FOREWORD

The Saudi Standards, Metrology and Quality (SASO) has adopted without any technical changes the International Standard: ISO 8848:1990 "Small craft -- Remote steering systems"

INTERNATIONAL STANDARD

IS0 8848

First edition 1990-12-15

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Small craft - Remote steering systems

Navires de plaisance - Appareils ZI gouverner command& a distance

Reference number IS0 8848: 1990(E)

IS0 8848:1990(E)

Foreword

IS0 (the International Organization for Standardization) is a worldwide federation of national standards bodies (IS0 member bodies). The work of preparing International Standards is normally carried out through IS0 technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. IS0 collaborates closely with the international Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.

Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an lnter- national Standard requires approval by at least 75 % of the member bodies casting a vote.

International Standard IS0 8848 was prepared by Technical Committee ISO/TC 188, Small craft.

NOTE 1 This International Standard specifies requirements and test methods for remote steering systems as cited in clause 1. More specialized requirements for such steering systems to be applied to simple outboard motors of 15 kW to 40 kW power are given in a parallel document, IS0 9775, Small craft - Remote steering systems for single outboard motors of 15 kW to 40 kW power.

0 IS0 1990 All rights reserved. No part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from the publisher.

International Organization for Standardization Case Postale 56 l CH-1211 Gerkve 20 l Switzerland

Printed in Switzerland

ii

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INTERNATIONAL STANDARD IS0 8848:1990(E)

Small craft - Remote steering systems

1 scope

This International Standard specifies requirements and test methods for remote push-pull cable steering systems and their major component items, used for small craft with single and twin installations of outboard motors of over 15 kW power, and all inboard motors, inboard motor-outdrives, and water- jet drives.

2 Definitions

For the purposes of this International Standard, the following definitions apply.

2.1 steering system: Assembly including all components necessary to transmit remote manual effort to the rudder, outboard motor, inboard-outdrive or water-jet drive.

2.2 boat-mounted steering system: System in which an output ram guide tube is secured to the boat.

2.3 motor-mounted steering system: System in which an output ram guide tube is secured to the engine.

2.4 drag link: Device in a motor-mounted steering system by which the linear force of the output ram is transmitted to the motor steering arm.

2.5 helm: Mechanism, exclusive of a steering- wheel or other means for manual application of controlling force, by which controlling force is fed into a steering system cable or other force- transmission means.

2.6 minimum retained system performance: System capability after test(s) such that at least 90 % of the steering arc normally available each side of the mid-position may be obtained by exertion of no more than 27 N.m of torque at the helm, through the wheel or other normal control.

This criterion does not define steering system performance while a boat is underway but is intended to provide quantitative limits for design and test purposes.

=3 General requirements

3.1 When steering systems are factory-installed in the boat, the complete system shall be supplied. In outboard motor-boats, the system shall be supplied complete to the interface point at the ram output end as shown in figure 1.

IS0 8848:1990(E)

Dimensions in millimetres

IS max.,

(at mid-travel position) 300 min. -

Tubes l5,75 + 0,13

Coupler nut 7/8-14 UNF-2B thread (optional for boat-mounted systems)

NOTE - Minimum travel : 100 mm each side of mid-travel position;

maximum travel : 115 mm each side of mid-travel position.

Figure 1

3.2 The steering system selected shall be installed in accordance with this International Standard.

3.3 Boats suitable for twin outboard motors shall be so designated, and it shall also be specified whether the boat is suitable for motor-mounted steering systems, boat-mounted steering systems or both. If the boat is suitable for boat-mounted steering systems, it shall also be specified whether well mounting, transom mounting or both (see figure2) may be used.

3.4 All threaded fasteners use of which affects safe operation of the steering system shall incorporate locking means.

3.5 Threaded fasteners use of which affects safe operation of the steering system and which are intended to be mounted or adjusted when installing the steering system in the boat, and which may be expected to be disturbed by installation or adjustment procedures, shall be locked by a locking device provided with instructions for correct assembly

Output ram

and complying with the requirements in 3.5.1 to X5.3.

3.5.1 Loose lock-washers, fasteners with metallic distorting threads and adhesive are prohibited.

3.52 Plain, threaded jam nuts are prohibited except that they may be used to permit adjustment and shall be designed so that total separation of parts or other complete loss of steering will not occur should they loosen.

NOTE 2 For assemblies not intended to be disassem- bled for installation, the choice of locking means is within the discretion of the system manufacturer.

3.5.3 A locking device shall be so designed that its presence can be determined by visual inspection or feel by a layman after installation.

3.6 Connection fittings including quick-disconnect fittings relying upon a spring or springs to maintain the connection shall not be used.

IS0 8848:1990(E)


Swivel axis to be 102-% square off face of transom (motor well k transom mounting)

NOTE - If the swivel is mounted in the motor well side fitting, the motor well shall provide for 380 mm mid-travel position from the swivel axis to the motor axis.

Swivel axis to be 12 max. above top of motor mounting face (motor well and transom mounting)

7/8--14 UNF-2B thread; min. length 16 on cable support tube

Motor mounting face of the clamp bra

Motor mounting

380 mid-travel position swivel axis to motor axis

Articulation 15’ min.

380 mid-travel position swivel axis to motor axis

a) Motor well mounting b) Transom mounting

and

NOTE - Minimum travel : 100 mm each side of mid-travel position;

maximum travel : 115 mm each side of mid-travel position.

Figure 2 - Boat-mounted steering system

4 Outboard motor and inboard-outdrive requirements

4.1 The steering stops on the outboard motor shall permit at least 30° of angular movement to either side of the centreline.

4.2 Outboard motors shall meet the applicable dimensional requirements indicated in figure 3 and figure 4.

4.3 The necessary fittings to attach an outboard motor to the steering output ram shown in figure 1 shall be supplied with the outboard motor.

4.4 The outboard motor shall be designed so that, with any combination of motor turn and tilt, there shall be no damaging interference between the motor, its accessories, and both the boat-mounted system installed as shown in figure2 and the

motor-mounted system, provided the motor is designed for both systems. Appropriate written information and installation instructions shall be provided, clearly indicating the type of steering system(s) that should be used.

4.5 Outboard motors shall be designed so that the geometry ensures that a static load of 3300 N, applied at the steering-arm connection point normal to the steering arm in its normal plane of operation, throughout the maximum steering arc, will not result in steering output ram loadings greater than those specified in 7.2.1.

4.6 The steering arm of the outboard motor shall be provided with a 318-24 UNF thread, or a plain hole of 9,65 mm to 9,9 mm diameter at the connection point.

ISQ 8848:1990(E)

4.7 Inboard-outdrives shall be designed with proper geometry to ensure that a torque of 680 Nm applied about the outdrive steering axis will not result in a steering component loading greater than that specified in 7.21.

5 Steering system requirements

5.1 Motor-mounted steering systems shall meet the dimensional requirements indicated in figure I, figure 3 and figure 4.

Ti

5.2 Boat-mounted steering systems for outboard motor installations shall meet the dimensional requirements indicated in figure 1 and figure 2. When a joint as shown in figure 2 is replaced by a uni- versal joint with two movement axes, the axis per- pendicular to the transom face shall be located 0 to 13 mm above the motor clamp bracket horizontal mounting face. The second axis shall be 100 mm to 115 mm from the inner surface of the transom and shall be not more than 28,5 mm from the first axis toward the motor.

5.3 Steering cables shall be marked at the engine end with a steering system length which shall be the length from the steering-wheel shaft centre to the hole centre in the steering output ram at the mid- travel position.

5.4 Installation instructions for steering helms shall include recommendations for the maximum diameter and deepest wheel dish (see figure 5) that may be used with the helm. In addition, the maximum diameter and deepest wheel dish information shall be permanently marked on the helm assembly to be visible when the helm is installed with the wheel removed.


Steering axis

f---Steering arm

Transom mating surface 1

Figure 4 - Motor-mounted steering tilt axis

/ 718-14 UNF-2A L + 0,25

thread both ends Tube o int. 16 o

Wheel level line

L Diameter i

NOTE - The standard quoted diameter is taken as the actual diameter minus 50 mm.

Dish Dimensions in millimetres

Motor axis

Figure 5 - Steering-wheels

NOTE - The tube may be threaded equal length on both ends or reversible for port steering installations.

Figure 3 - Motor-mounted steering tube

4

IS0 8848:1990(E)

Motor centreline

6.2 If installing motor-mounted steering systems in outboard motor-boats, steering cables or other force-transmission means shall be selected so that, as installed and at mid-travel position, the output ram or equivalent component connection point shall reach at least 270 mm beyond the motor centreline as indicated in figure 6.

Mid-travel position Connection point

6.3 If installing boat-mounted steering systems in outboard motor-boats, steering cables or other force-transmission means shall be selected so that, as installed and at mid-travel position, the output

Figure 6 - Motor-mounted steering system ram or equivalent component connection point will reach at least to the motor centreline. The cable shall be attached to the boat to position the cable- anchor swivel with respect to the transom-motor centreline as specified in figure 2.

5.5 Steering systems and components shall be capable of meeting the applicable test requirements specified in clause 7.

5.6 Plastics and elastomers which may be exposed to sunlight shall be chosen to resist degradation by ultraviolet radiation.

5.7 Plastics and elastomers which may be installed in engine compartments shall be chosen to resist degradation by saline atmospheres, fuel, oil and heat.

6.4 Inboard-outdrive or water-jet drive installations shall be such that with any combination of drive turn and tilt, there shall be no damaging interference between the inboard-outdrive or jet drive, its accessories and any part of the boat or steering system.

6.5 Cables shall be installed with as few bends as practicable. Bends should have as large a radius as practicable and the radius shall not be smaller than the manufacturer’s recommended minimum.

6.6 Steering-wheels and helm shafts shall be selected to fit each other. Current fit configurations are shown in figure 7.

6 Installation 6.7 Steering systems and components as installed shall be capable of meeting the test requirements in 7.1.

6.1 Except for installations specifically intended for boats or outboard motors with special requirements, either the motor-mounted or the boat-mounted steering system shall be used.

6.8 If the steering cable passes through the side of an outboard motor well below the static float plane, the cable access port shall be appropriately sealed.

5

IS0 8848:1990(E)

NOTE - Hub keyway: 4,79 mm min. and 5,07 mm max.

c .- E I -

-1 22.2 o- I

a) Clearance to shoulder b) Hub


(v 09

00 I

00 C

c) Steering shaft and wheel fit

Figure 7 - Steering shafts and steering-wheel hubs

IS0 8848:1990(E)

7 Test requirements

7.1 As-installed tests

These tests are intended to establish the accepta- bility of the design strength of steering systems as installed in a boat to the interface with the outboard motor.

7.1.1 Steering systems shall withstand a static load in either direction of 3300 N applied at the connection hole of the steering output ram along the axis of the steering output ram without deformation that, following the test, will cause any loss in steering capability or any dimensional change that re- sults in non-compliance with figure 2. The permanent deformation shall not exceed 6,35 mm measured along the axis of the output ram.

7.1.2 Steering systems shall withstand a single tangential load in either direction of 450 N applied as appropriate:

- at any point on the steering-wheel rim,

- at the centre-point of any handgrip of an external spoke steering-wheel, or

- at the point of maximum leverage on other steering devices,

and a subsequent separate single axial load of 670 N, in each direction, distributed over not more than 100 mm of the rim, spoke or handgrip, at any location maintaining minimum retained system performance. Upon application of the indicated loads there shall be no fracture of the mounting surface or boat structure, nor deformation such that the re- quired loads cannot be achieved.

A test for minimum retained system performance shall be performed on the steering system in its condition at the end of the load tests. Repairs to the system are not allowed prior to testing for minimum retained system performance. Failure to maintain

minimum retained system performance or the separation of components necessary for steering control including separation of any portion of the helm, transom, or motor well mounts from the boat as a result of the application of the load forces specified in this clause all constitute failure.

7.2 Component tests

These tests are intended to establish minimum ac- ceptable design criteria for components of steering systems.

7.2.1 Steering cable and output assembly tests

7.2.1.1 Each steering output and cable assembly (including boat-mounted system hardware) and each integral fitting shall withstand an axial load of 9000 N in tension and compression, applied at the connection hole of the steering output ram throughout its travel range, without severance of components.

7.2.1.2 A separate cantilever load of 900 N shall be applied at the centreline of the hole in the steering output ram, with at least 190 mm of the ram unsup- ported, without more than I,25 mm of permanent deflection at the ram hole.

7.2.1.3 The output ram of a push-pull steering cable shall withstand a cyclic load of + 1670 N applied as shown in figure8, without causing separation of components. This load shall be applied for 50000 reversals through the cable cross-hole.

7.2.2 Helm assembly tests

Helm assemblies shall incur no loss of operating function after the following tests, when equipped with the largest diameter and deepest dish steering-wheel for which the helm is rated.

Helms for two-cable systems shall comply with each cable installed individually.

Test position 1

Figure 8 - Output ram fatigue test

IS0 8848:1990(E)

7.2.2.1 Axial load test

A 670 N push-pull load distributed over not more than 100 mm of the

7.2.3.3 At the completion of the thermal conditioning and ultraviolet exposure, the wheel shall be maintained at a temperature of 20 “C to 24 “C for at least 3 h. It shall then, in sequence, withstand the mechanical tests in 7.2.3.3.1 to 7.2.3.3.3.

- steering-wheel rim, 7.2.3.3.1 Axial load test

- handgrip of an external spoke steering-wheel, or

- handgrip at the point of maximum leverage on other steering devices,

shall be applied, at any single location, in a direction parallel to the steering shaft axis for 10 cycles for a duration of 5 s per loading.

7.2.2.2 Tangential load test

A 450 N load in each direction shall be applied

- at any point on the steering-wheel rim,

- at the centre- point of any handgrip of an external spoke steerin g-wheel ! or

- at the point of maximum leverage on any other steering devices,

at any single location, tangential to the plane of the steering-wheel rim or in the plane of motion of other steering devices, at any point in its total steering range, for 10 cycles for a duration of 5 s per loading.

7.2.3 Steering-wheel tests

NOTE 3 The thermal conditioning (7.2.3.1) and ultraviolet exposure (7.2.3.2) may be omitted on wheels of all metal and/or wood construction and wheels whose plastics parts are not structural.

7.2.3.1 Steering-wheels shall be subjected to three cycles of thermal conditioning before mechanical tests are performed. One cycle of thermal conditioning is defined as

- 3 h at 21 “C + 2 OC, -

- 3 h at -34 “C + 2 OC, -

- 3 h at 21 “C + 2 “C, -

- 3 h at 71 “C + 2 “C. -

7.2.3.2 At the completion of thermal conditioning, the steering-wheels shall be subjected to 110 h of exposure to ultraviolet rays of one RS sunlamp or equivalent UV lamps at a distance of 480 mm and a temperature of 60 “C.

A 670 N push-pull load, distributed over not more than 100 mm of the

- steering-wheel rim, or

- handgrip of an external spoke steering-wheel,

shall be applied, at any single location, in a direction parallel to the steering shaft axis for 10 cycles for a duration of 5 s per loading without fracture or permanent deformation in excess of 25,4 mm at the rim, or spoke handgrip.

7.2.3.3.2 Tangential load test

A 450 N load in each direction shall be applied

- at any point on the steering-wheel rim, or

- at the centre-point of any handgrip of an external spoke steering-wh eel,

at any single location, tangentially in the plane of the steering-wheel rim or in the piane of motion of other steering devices, for 10 cycles for a duration of 5 s per loading without fracture.

7.2.3.3.3 Impact load tests

The fixture shown in figure9 and the following pro- cedure shall be used.

The impact test apparatus to be used (see figure9) shall be a completely filled 250 mm diameter leather bag, containing lead, producing a force of 785 N in total and suspended on a free swinging cable, such that the centre of mass is 2250 mm to 2300 mm from a supporting pivot. The impact face of the bag shall be a 250 mm diameter end. The bag shall be elevated through sufficient arc to create the desired impact value upon a rigidly mounted steering-wheel by swinging the bag as indicated in figure 9. The fixture shall be rigidly secured against movement. De- vices other than that specified such as a falling weight bag may be used providing equivalence can be verified.

Impact load test No. 1

With 11 = 204 mm, wheels shall withstand a single impact of 160 N-m at any location on the rim, without

- deformation that would cause loss of minimum retained system performance when installed on a steering system,

IS0 8848:1990(E)

- spreading of any cracks existing before this test, or

- the appearance of new cracks.

Impact load test No. 2

With h = 345 mm, wheels shall withstand a single impact of 270 N-m at any location on the rim without complete separation of the rim and the hub.

d = 2 250 mm min., 2 300 mm max.

F= 785 N

i = impact value, in Narn

1 000 i h= ~ (mm)

F

Impact test

(see 7.2.3.3.3)

No. 1

’ No. 2

i h N-m mm

160 204

270 345

Figure 9 - Steering-wheel impact test fixture

IS0 8848:1990(E)

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UDC 629.125.014.5-519

Descriptors: shipbuilding, small craft, control devices, steering control devices, remote control, specifications, tests.

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