1、 Collection of SANS standards in electronic format (PDF) 1. Copyright This standard is available to staff members of companies that have subscribed to the complete collection of SANS standards in accordance with a formal copyright agreement. This document may reside on a CENTRAL FILE SERVER or INTRA
2、NET SYSTEM only. Unless specific permission has been granted, this document MAY NOT be sent or given to staff members from other companies or organizations. Doing so would constitute a VIOLATION of SABS copyright rules. 2. Indemnity The South African Bureau of Standards accepts no liability for any
3、damage whatsoever than may result from the use of this material or the information contain therein, irrespective of the cause and quantum thereof. ISBN 978-0-626-21833-1 SANS 8848:2008 Edition 1 ISO 8848:1990 Edition 1SOUTH AFRICAN NATIONAL STANDARD Small craft Remote steering systems This national
4、standard is the identical implementation of ISO 8848:1990, and is adopted with the permission of the International Organization for Standardization. Published by SABS Standards Division 1 Dr Lategan Road Groenkloof Private Bag X191 Pretoria 0001 Tel: +27 12 428 7911 fax: +27 12 344 1568 www.sabs.co.
5、za SABS This standard may only be used and printed by approved subscription and freemailing clients of the SABS.SANS 8848:2008 Edition 1 ISO 8848:1990 Edition 1 Table of changes Change No. Date Scope National foreword This South African standard was approved by National Committee SABS TC 188, Small
6、craft, in accordance with procedures of the SABS Standards Division, in compliance with annex 3 of the WTO/TBT agreement. This SANS document was published in August 2008. This standard may only be used and printed by approved subscription and freemailing clients of the SABS.INTERNATIONAL STANDARD IS
7、0 8848 First edition 1990-12-15 - Small craft - Remote steering systems Navires de plaisance - Appareils ZI gouverner command 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 Boa
8、ts 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 mount
9、ing, 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 in- tended to be mounted or
10、adjusted when installing the steering system in the boat, and which may be expected to be disturbed by installation or adjust- ment procedures, shall be locked by a locking de- vice provided with instructions for correct assembly Output ram and complying with the requirements in 3.5.1 to X5.3. 3.5.1
11、 Loose lock-washers, fasteners with metallic distorting threads and adhesive are prohibited. 3.52 Plain, threaded jam nuts are prohibited ex- cept 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 shou
12、ld 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 in
13、stallation. 3.6 Connection fittings including quick-disconnect fittings relying upon a spring or springs to maintain the connection shall not be used. SANS 8848:2008This standard may only be used and printed by approved subscription and freemailing clients of the SABS.IS0 8848:1990(E) Dimensions in
14、millimetres 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 mo
15、tor 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 mo
16、unting 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 perm
17、it at least 30 of angular movement to either side of the centreline. 4.2 Outboard motors shall meet the applicable di- mensional 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
18、 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 mo- tor, its accessories, and both the boat-mounted sys- tem installed as shown in figure2 and the motor-mounted system, provided th
19、e motor is de- signed for both systems. Appropriate written infor- mation 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, ap- plied
20、 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 UN
21、F thread, or a plain hole of 9,65 mm to 9,9 mm diameter at the connection point. SANS 8848:2008This standard may only be used and printed by approved subscription and freemailing clients of the SABS.ISQ 8848:1990(E) 4.7 Inboard-outdrives shall be designed with proper geometry to ensure that a torque
22、 of 680 Nm applied about the outdrive steering axis will not re- sult 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 Bo
23、at-mounted steering systems for outboard motor installations shall meet the dimensional re- quirements 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 1
24、3 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 wh
25、ich 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
26、the helm. In addition, the maxi- mum 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. Dimensions in millimetres Steering axis f-Steering arm Transom mating surface 1 Figure 4 - Motor-mounted
27、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 leng
28、th on both ends or reversible for port steering installations. Figure 3 - Motor-mounted steering tube 4 SANS 8848:2008This standard may only be used and printed by approved subscription and freemailing clients of the SABS.IS0 8848:1990(E) Motor centreline 6.2 If installing motor-mounted steering sys
29、tems 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 pos
30、ition 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 connec
31、tion 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
32、 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 in- stalled in engine compartments shall be chosen to resist degradation by saline atmospheres, fuel, oil and
33、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 acces- sories and any part of the boat or steering system. 6.5 Cables shall be installed
34、with as few bends as practicable. Bends should have as large a radius as practicable and the radius shall not be smaller than the manufacturers recommended minimum. 6.6 Steering-wheels and helm shafts shall be se- lected to fit each other. Current fit configurations are shown in figure 7. 6 Installa
35、tion 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 SANS 8848:2008This standard may only be used and printed by approved subscription and freemailing clients of the SABS.
