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IS0
I N T ERN AT1 ON A L O R G A N I2 AT1 O N FO R S TA N DA RD 1 ZATl ON
IS0 RECOMMENDATION
R 1005/Vll
RAILWAY ROLLING STOCK MATERIAL
WHEEL SETS FOR TRAILER STOCK
1st EDITION
May 1969
COPYRIGHT RESERVED
The copyright of IS0 Recommendations and IS0 Standards
belongs to IS0 Member Bodies. Reproduction of these
documents, in any country, may be authorized therefore only
by the national standards organization of that country, being
a member of ISO.
For each individual country the only valid standard is the national standard of that country
Printed in Switzerland
Also issued in French and Russian. Copies to be obtained through the national standards organizations.
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BRIEF HISTORY
The IS0 Recommendation R lOOS/VII, Railway rolling stock material - Wheel sets for trailer stock, was
drawn up by Technical Committee ISO/TC 17, Steel, the Secretariat of which is held by the British Standards
Institution (BSI).
Work on this question led to the adoption of a Draft IS0 Recommendation based on a corresponding UIC*
code.
In January 1968, this Draft IS0 Recommendation (No. 1381) was circulated to all the IS0 Member Bodies
for enquiry. It was.approved, subject to a few modifications of an editorial nature, by the following Member
Bodies :
Austria Hungary
Romania
Belgium India South Africa, Rep. of
Canada Israel Spain
Colombia Italy Sweden
Czechoslovakia Korea, Rep. of Switzerland
Denmark Netherlands Turkey
Finland New Zealand U.A.R.
France Norway United Kingdom
Germany Poland Yugoslavia
Two Member Bodies opposed the approval of the Draft
Brazil
Japan
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IS0 Recommendation was then submitted by correspondence to the IS0 Counci1,which decided, in
The Draft
May 1969, to accept it as an IS0 RECOMMENDATION.
*
Union Internationale des Chemins de Fer (International Union of Railways).
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ISO/R 1005/VI1-1969 (E)
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IS0 Recommendation R 1005/VII May 1969
RAILWAY ROLLING STOCK MATERIAL
WHEEL SETS FOR TRAILER STOCK
1. SCOPE
This IS0 Recommendation applies to the supply of wheel sets* for trailer stock (with the exception of
railcar-type trailer stock).
It states the conditions for the construction of wheel sets, each component of which is covered by a separate
document in this ISO/R 1005 series of Recommendations.
In addition, it states the conditions for acceptance and guarantee.
2. CLASSIFICATION
This IS0 Recommendation covers two categories of wheel sets :
- axles whose journals are fitted with plain bearings;
- axles whose journals are fitted with roller bearings.
These two categories differ essentially in the shape of the axle ends. The conditions for acceptance being the
same, there is no special designation for distinguishing each class, other than those which may be shown in the
contracts prepared by each purchaser.
3. MECHANICAL PROPERTIES
Back pressure. The back pressure should reach, in the case of each wheel, at least
- 1.2 times the actual application pressure, if the operation has been carried out when cold,
- a value, expressed in kilogrammes-force, equal to 600 times the diameter of the seating surface,
expressed in millimetres, if the operation has been carried out when hot,
without causing any displacement of the wheel on the axle.
~
*
The term “wheel set” designates the complete unit constituted by the assembly of an axle and two wheels, which unit supports
the underframe of a vehicle and permits the movement of the vehicle on the track.
The wheels may be either
- solid wheels in rolled or forged steel, or
- tyred wheels : in this case they should consist of a wheel centre of roiled, forged or cast steel, fitted with a tyre.
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ISO/R 1005/VII-1969 (E)
4. PHYSICAL PROPERTIES
4.1 Soundness of tyring (in the case of tyred wheels)
The wheel assembly should give a clear ring when struck with a hammer.
4.2 Balance
The purchaser should specify one of the following two characteristics :
4.2.1 Static balance. The out-of-baiance should be less than 0.250 m.kgf.*
4.2.2 Dynamic balance. The maximum out-of-balance, and the method to be adopted for its measurement,
depending on the use for which the axles are intended, should be stated on the order.
4.3 Electrical resistance
The electrical resistance of the wheel set should not exceed 0.01 S2.
4.4 Surface condition of the journals
When specified on the order, the cylindrical surfaces of the journals should be roller burnished.
5. DIMENSIONAL CHARACTERISTICS
The wheel set should comply with the information shown on the standards or drawings for the dimensions
and the dimensional tolerances, the running tread thickness being kept as great as possible.
When the dimensional tolerances are not stated in the standards or drawings, the tolerances given in the Annex
to this IS0 Recommendation should apply.
In addition, the running surface should reveal only slight traces of machining.
6. IDENTIFYING MARKS
The component parts of the wheel sets should bear the identifying marks shown on the particular drawings of
each purchaser. In addition, the wheel set should be stamped with the marks necessary, in order to identify
- its type,
- its number,
- the purchaser,
- the date of construction or of entry into service (number of the month and last two figures of the year).
Example : U2R - 4561 - S.N.C.F. - 9.69
These identifying marks should be stamped on the ends of the axle, in characters of similar dimensions to those
of the brands on the axle itself.
When, in very exceptional cases, there is insufficient room on the ends of the axles (in the case of roller-bearing
axles), the brands should be stamped on a steel sheet collar placed around the body of the axle, and the ends of
the collar should be riveted or welded together.
In the case of tyred wheels, the following marks should also be stamped near the identifying marks on the tyres
- date of tyring;
- the brand ofthe particular workshop or factory having carried out the tyring operation.
*
In the case of certain special stock, the order may specify a maximum out-of-balance value less than that given above.
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iSO/R 1005/VII-1969 (E)
7. PREPARATION OF THE COMPONENTS
The axles, solid wheels, wheel centres, tyres and retaining rings for the tyres should satisfy the requirements of
the technical specifications, and the standards or drawings specially prepared for each component.
The components should also comply with the conditions described in clauses 7.1 to 7.5.
7.1 Axle
The centre holes or “centres”, in accordance with the drawings, should be retained in the two ends
Each wheel seat should be machined so as to obtain a cylindrical assembly. This machining should be
carried out so that no scoring or accidental trace of machining remains. The surface condition (micro-
geometry) of the wheel seats should comply with all the additional requirements specified by the
purchaser.
If required by the purchaser, each wheel seat can be improved by burnishing, in accordance with the
conditions defined on the order.
When the drawing gives no numerical information, a slight conical lead-in not exceeding 1 mm at the
smallest diameter may be permitted on the wheel seats over a maximum length of 10 mm (3/8 in).
If requested by the purchaser on the order, the cylindrical bearing surface of the journals should be
burnished before being placed beneath the vehicle, this operation being carried out either before or
after assembly of the wheel centres on the axle.
After machining, the identifying marks stamped on the wheel seats of the axle should be re-stamped in
the prescribed position on the ends of the wheel seats.
7.2 Solid wheels and wheel centres
The bore of the boss of the wheels and wheel centres and the cylindrica! surface of the wheel centres
intended to receive the tyres should be machined with a slow feed and should not show any groove or
abnormal trace of machining.
The condition of these surfaces (microgeometry) should comply with all the additional requirements
specified in the order by the purchaser.
Each solid wheel or wheel centre should have been balanced in accordance with the requirements of the
technical specifications, standards or drawings relating to it.
When holes for stops are provided, these should be drilled after the balancing of the wheels and wheel
centres, in such a way that their centres lie on the diameter passing through the position of the out-of-
balance.
The edges of these holes should not be sharp
7.3 Tires
The bore of the tyres should be machined with a slow feed and should not show any groove or abnormal
trace of machining.
The surface condition (microgeometry) should satisfy all the additional requirements specified in the
order by the purchaser; the value of the diameter of the bore is given in mm by the following formula
(1.5 2 0.3) D,
D=D, - -
1 O00
where
D is the diameter of the bore of the tyre, expressed in millimetres;
is the mean outside diameter of the rim of the wheel centre, expressed in millimetres
Dl
The mean diameter of the rim is that resulting from the average of the measurements from at least two
perpendicular diameters.
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ISO/R 1005/VII-1969 (E)
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7.4 Retaining rings
The cross-section of thé rings may be of two types, in accordance with the drawing of the purchaser
- special profile,
- rectangular profile.
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The ring should be used rough-rolled. Bending should be carried out with care so as to avoid all twist.
Its length should be such that, after fitting, the distance between the two ends is not greater than 5 mm.
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7.5 Ail components
All portions machined to the finished size of components which are not required to be assembled
immediately after machining, should be protected against corrosion by the application of a coating of
some protective material agreed upon by the purchaser.
8. ASSEMBLY OF THE COMPONENTS
The axles, solid wheels, wheel centres, tyres and retaining rings having been manufactured in accordance with
the conditions specified in section 7, and checked by suitable gauges, assembly should be carried out in
compliance with the following requirements.
The shrinkage necessary to obtain the fiing under the pressure indicated hereafter can be determined by the
purchaser, who lays down the corresponding dimensional tolerances.
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Shrinkage onto the axles should be carried out either
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