EN 12965:2003
(Main)Tractors and machinery for agriculture and forestry - Power take-off (PTO) drive shafts and their guards - Safety
Tractors and machinery for agriculture and forestry - Power take-off (PTO) drive shafts and their guards - Safety
This Standard specifies safety requirements and their verification for design and construction of guards and detachable transmission shafts intended to link a tractor or a self-propelled machine to the first fixed bearing of a recipient machinery. This Standard concerns only the equipments for which the guards are mechanically linked to the drive shaft by at least two bearings. This Standard does not deal with the guards totally covering the drive shaft, nor the guards intended to be fitted on various types of drive shafts.
Traktoren und Maschinen für die Land- und Forstwirtschaft - Gelenkwellen und ihre Schutzeinrichtungen - Sicherheit
Diese Norm enthält sicherheitstechnische Anforderungen und deren Überprüfung für die Gestaltung und Konstruktion von Gelenkwellen und ihren Schutzeinrichtungen, die für die Verbindung zwischen einer selbstfahrenden Maschine (oder einem Traktor) und dem ersten festen Lager der angetriebenen Maschine bestimmt sind. Sie beschreibt Maßnahmen zur Vermeidung oder Verminderung von Gefährdungen, für die spezifische Anforderungen benötigt werden. Diese Norm gilt nur für Gelenkwellen, bei denen die Schutzeinrichtungen mechanisch mit der Gelenkwelle über mindestens zwei Lager verbunden sind.
Außerdem gibt sie Informationen über sicheres Arbeiten, die vom Hersteller zur Verfügung zu stellen sind.
Diese Norm behandelt nicht:
- Schutzeinrichtungen, die die Gelenkwelle vollständig umschließen und die nicht mechanisch mit der Gelenkwelle verbunden sind. Da diese Einrichtungen derzeit nur in geringem Umfang auf dem Markt angeboten werden, sollten sie bei einer künftigen Überarbeitung dieser Norm behandelt werden;
- die mechanischen Eigenschaften von Gelenkwellen, Freiläufen und Drehmomentbegrenzern;
- allgemeine Gefährdungen, die in EN 1553 behandelt werden (siehe Einleitung).
Umweltaspekte wurden in dieser Norm nicht in Betracht gezogen.
Dieses Dokument gilt nicht für Gelenkwellen und ihre Schutzeinrichtungen, die hergestellt wurden, bevor CEN dieses Dokument veröffentlichte.
Tracteurs et matériels agricoles et forestiers - Arbres de transmission à cardans de prise de force et leurs protecteurs - Sécurité
La présente norme spécifie les prescriptions de sécurité et leurs vérifications pour la conception et la construction des arbres de transmission à cardans de prise de force et leurs protecteurs reliant une machine automotrice (ou un tracteur) au premier palier fixe d'une machine réceptrice, en décrivant des méthodes pour l'élimination ou la réduction des risques qui nécessitent des prescriptions spécifiques. La présente norme ne concerne que les arbres de transmission à cardans et leurs protecteurs liés mécaniquement à l'arbre de transmission à cardans par au moins deux paliers de roulement.
En outre, elle spécifie le type d'informations que le fabricant doit donner sur les pratiques d'utilisation sûre.
La présente norme ne traite pas :
des protecteurs recouvrant totalement l'arbre de transmission sans y être mécaniquement relié. Vu que ces dispositifs ne sont pas largement répandus sur le marché pour le moment, il conviendra de les prendre en compte lors d'une future révision de la présente norme ;
des caractéristiques mécaniques des arbres de transmission à cardans, des systèmes de roue libre et des limiteurs de couple ;
des phénomènes dangereux généraux qui sont traités dans l'EN 1553 (voir introduction).
Les aspects liés à l'environnement n'ont pas été pris en compte dans cette norme.
Ce document n'est pas applicable aux arbres de transmission à cardans et leurs protecteurs qui ont été fabriqués avant la date de publication de ce document par le CEN.
Kmetijski in gozdarski stroji – Priključne gredi in njihova zaščita – Varnost
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
01-januar-2004
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Tractors and machinery for agriculture and forestry - Power take-off (PTO) drive shafts
and their guards - Safety
Traktoren und Maschinen für die Land- und Forstwirtschaft - Gelenkwellen und ihre
Schutzeinrichtungen - Sicherheit
Tracteurs et matériels agricoles et forestiers - Arbres de transmission a cardans de prise
de force et leurs protecteurs - Sécurité
Ta slovenski standard je istoveten z: EN 12965:2003
ICS:
65.060.01 Kmetijski stroji in oprema na Agricultural machines and
splošno equipment in general
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EUROPEAN STANDARD
EN 12965
NORME EUROPÉENNE
EUROPÄISCHE NORM
June 2003
ICS 65.060.01
English version
Tractors and machinery for agriculture and forestry - Power
take-off (PTO) drive shafts and their guards - Safety
Tracteurs et matériels agricoles et forestiers - Arbres de Traktoren und Maschinen für die Land- und Forstwirtschaft
transmission à cardans de prise de force et leurs - Gelenkwellen und ihre Schutzeinrichtungen - Sicherheit
protecteurs - Sécurité
This European Standard was approved by CEN on 13 February 2003.
CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European
Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national
standards may be obtained on application to the Management Centre or to any CEN member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CEN member into its own language and notified to the Management Centre has the same status as the official
versions.
CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece,
Hungary, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Slovakia, Spain, Sweden, Switzerland and United
Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: rue de Stassart, 36 B-1050 Brussels
© 2003 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 12965:2003 E
worldwide for CEN national Members.
Contents
Page
Foreword.3
0 Introduction .4
1 Scope .4
2 Normative references .4
3 Terms and definitions.5
4 Requirements and/or safety measures.8
4.1 General requirements.8
4.2 Universal joint .8
4.3 Wide-angle universal joint .9
4.4 Guard.11
4.5 Intervention points.11
4.6 Restraining system.11
5 Verification of safety requirements and/or measures.11
5.1 General.11
5.2 Test for cone guarding the universal joints.11
6 Information for use .13
6.1 Instruction handbook .13
6.2 Marking and warning.15
Annex A (normative) List of hazards.16
Annex ZA (informative) Relationship of this document with EC Directives.20
Bibliography .21
Foreword
This document (EN 12965:2003) has been prepared by Technical Committee CEN /TC 144, "Tractors and
machinery for agriculture and forestry", the secretariat of which is held by AFNOR.
This European Standard shall be given the status of a national standard, either by publication of an identical text or
by endorsement, at the latest by December 2003, and conflicting national standards shall be withdrawn at the latest
by December 2003.
This document has been prepared under a mandate given to CEN by the European Commission and the European
Free Trade Association, and supports essential requirements of EC Directive(s).
For relationship with EC Directive(s), see informative annex ZA, which is an integral part of this document.
EN 1152:1994 "Tractors and machinery for agriculture and forestry — Guards for power take-off (PTO) drive shafts
— Wear and strength tests" complements this European Standard which gives definitions and requirements
concerning PTO drive shafts and their guards.
Annex A is normative.
This document includes a Bibliography.
According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following
countries are bound to implement this European Standard: Austria, Belgium, Czech Republic, Denmark, Finland,
France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal,
Slovakia, Spain, Sweden, Switzerland and the United Kingdom.
0 Introduction
This European Standard is a type C standard as defined in EN 1070.
The machinery concerned and the extent to which hazards, hazardous situations and events are covered are
indicated in the scope of this document.
When provisions of this type C standard are different from those which are stated in type A or B standards, the
provisions of this type C standard take precedence over the provisions of the other standards, for machines that
have been designed and built according to the provisions of this type C standard.
The hazards that are common to agricultural machines (self-propelled, mounted, semi-mounted and trailed) are
dealt with in EN 1553.
1 Scope
This standard specifies safety requirements and their verification for the design and construction of power take-off
(PTO) drive shafts and their guards linking self-propelled machinery (or tractor) to the first fixed bearing of recipient
machinery, by describing methods for the elimination or reduction of risks which need specific requirements. This
standard concerns only the PTO drive shafts and those guards which are mechanically linked to the PTO drive
shaft by at least two bearings.
In addition, it specifies the type of information on safe working practices to be provided by the manufacturer.
This standard does not deal with:
the guards totally covering, but not mechanically linked to, the PTO drive shaft. As these devices are not at
present widely established on the market, they should be dealt with in a future revision of this standard;
the mechanical characteristics of PTO drive shafts, overrun devices and torque limiters;
general hazards which are dealt with in EN 1553 (see introduction).
Environmental aspects have not been considered in this standard.
This document is not applicable to PTO drive shafts and their guards which are manufactured before the date of
publication of this document by CEN.
2 Normative references
This European Standard incorporates by dated or undated reference, provisions from other publications. These
normative references are cited at the appropriate places in the text, and the publications are listed hereafter. For
dated references, subsequent amendments to or revisions of any of these publications apply to this European
Standard only when incorporated in it by amendment or revision. For undated references the latest edition of the
publication referred to applies (including amendments).
EN 292-1:1991, Safety of machinery – Basic concepts, general principles for design – Part 1: Basic terminology,
methodology.
EN 292-2:1991, Safety of machinery – Basic concepts, general principles for design – Part 2 : Technical principles
and specifications (including amendment A1:1995).
EN 294:1992, Safety of machinery – Safety distance to prevent danger zones being reached by the upper limbs.
EN 1070: 1998, Safety of machinery – Terminology.
EN 1152, Tractors and machinery for agriculture and forestry – Guards for power take-off (PTO) drive shafts –
Wear and strength tests.
ISO 5673:1993, Agricultural tractors and machinery – Power take-off drive shafts and position of power-input
connection.
ISO 11684:1995, Tractors, machinery for agriculture and forestry, powered lawn and garden equipment – Safety
signs and hazard pictorials – General principles.
3 Terms and definitions
For the purposes of this European Standard, the terms and definitions given in EN 1070:1998 and ISO 5673:1993
and the following apply.
3.1
restraining system
part of the PTO drive shaft guard which prevents rotation of the guard when the PTO drive shaft rotates
NOTE See Figure 1a [14] - only shown as an example.
3.2
wide-angle universal joint
constant-velocity joint allowing operation with an articulation generally higher than 50°
NOTE See Figure 1b 9 - only shown as an example.
3.3
overrun device
device that permits the transmission of motion only in one direction (from the tractor towards the recipient
machinery). See Figure 2
NOTE It is normally used with recipient machine having high value inertia.
3.4
torque limiter
device that cuts or limits the transmission of motion between tractor and recipient machinery, when the torque
reaches a prefixed value. See Figure 3
Figure 1a
Figure 1b
Key
1 Power take-off (PTO) 10 Guard cone
2 Power-input connection (PIC) 11 Guard tube
3 PTO yoke 12 Guard bearing
4 PIC yoke 13 Separate guard of wide angle universal joint
5 End of inner yoke of universal joint 14 Restraining system
6 Universal joint 15 PTO drive shaft guard
7 Double yoke 16 PTO wide-angle drive shaft guard
8 End of double yoke of outer joint
9 Wide-angle universal joint
Figure 1 — Parts of drive shaft and guard
Key
1PIC
2 Overrun device
Figure 2 — Example of overrun device
Key
1PIC
2 Torque limiter
Figure 3 — Example of torque limiter
4 Requirements and/or safety measures
4.1 General requirements
The PTO drive shafts and their guards shall comply with the safety requirements and/or protective measures of this
clause. In addition, the machine shall be designed according to the principles of EN 292 for hazards relevant but
not significant, which are not dealt with by this standard (e.g. thermal hazards).
The list of significant hazards dealt with in this standard is given in annex A. Annex A also indicates the hazards
which have not been dealt with.
The manufacturer shall provide data in the instruction handbook (see 6.1) defining the limiting use that can be
made of the drive shaft and its guards. This shall include operating data and warnings against misuse (see 6.2).
The guard shall be designed to prevent contact with the moving components of the drive shaft whilst the drive shaft
being operated in accordance with the instruction handbook and whilst the drive shaft being connected in the
appropriate way between a tractor or self-propelled machine and a recipient machine.
The outside parts of the guard shall not turn with the transmission shaft.
The guard shall comply with acceptance criteria of EN 1152.
The locking system of the PTO yoke (see Figure 1a and Figure 1b) shall have no point which can cause
entanglement (e.g. by collar design).
If there is a torque limiter and/or an overrun device on the drive shaft it shall be positioned only on the PIC side of
the drive shaft as shown in Figures 2 and 3. Relevant marking shall be provided.
Unless otherwise specified in this standard, all the apertures and safety distances shall comply with the
requirements of Tables 1, 3, 4 and 6 of EN 294:1992.
Warnings shall be provided on the guards specifying the necessity to read the instruction handbook.
4.2 Universal joint
The guard shall cover the drive shaft at least up to the end of the inner yoke of the universal joint (see Figure 1a
and Table 1 for dimension c in Figure 4).
Table 1 — Maximum distance between the end of the PTO drive shaft guard and the axis of the locking
device
Dimensions in millimetres
PTO type c (maximum)
NOTE Dimension c is under study by CEN/TC 144/WG 1.
Key
1 Master shield of tractor power take-
...
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