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1、BRITISH STANDARD AUTOMOBILE SERIES BS AU 50-2.0a:1979 (Superseding BS AU 50-2.0:1979) Incorporating Amendment No. 1 Specification for Tyres and wheels Part 2: Wheels and rims Section 0: General (including terms and definitions, and construction and workmanship) UDC 629.113.012.3 + 629.113.012.5 Lice
2、nsed Copy: London South Bank University, London South Bank University, Sat Dec 09 01:52:18 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS AU 50-2.0a:1979 This British Standard, having been prepared under the direction of the Automobile Standards Committee, was published under the authority of the Exe
3、cutive Board and comes into effect on 31 December 1979 BSI 03-2000 The following BSI references relate to the work on this standard: Committee reference AUE/4 Draft for comment 78/71768 DC ISBN 0 580 11047 8 Amendments issued since publication Amd. No.Date of issueComments 8365February 1995Indicated
4、 by a sideline in the margin Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 01:52:18 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS AU 50-2.0a:1979 BSI 03-2000i Contents Page Forewordii 0.1Scope1 0.2Terms and definitions1 0.3Construction and workmanship2 Figure
5、1 Rim types4 Figure 2 Divided wheel6 Figure 3 Wire wheel6 Figure 4 Reversible wheel7 Figure 5 Adjustable wheel7 Figure 6 Nomenclature for wheel dimensions8 Figure 7 Nomenclature for cast light alloy wheels for passenger cars9 Figure 8 Nomenclature for dimensions of cast light alloy wheels for passen
6、ger cars9 Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 01:52:18 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS AU 50-2.0a:1979 ii BSI 03-2000 Foreword British Standard BS AU 50-2 “Wheels and rims” was first published in 1964. It was revised in 1973 as BS AU 50
7、-2a “Wheels and rims Dimensions”, and in 1979 Sections 1 and 2 were revised and published as a separate Section, Section 0. Tyre, wheel, rim, and valve requirements are given in the following Parts and Sections of BS AU 50: Part 1: Tyres; Section 0: General; Section 1: Car tyres; Section 2: Commerci
8、al vehicle tyres; Section 3: Off-the-road tyres; Section 4: Agricultural vehicle tyres; Section 5: Industrial vehicle tyres; Section 6: Motorcycle tyres; Section 7: Moped tyres; Section 8: Code of practice for the storage of tyres, inner tubes and flaps; Part 2: Wheels and rims; Section 0: General (
9、including terms and definitions, and construction and workmanship); Section 1: Rim profiles and dimensions (including openings for valves)1); Section 2: Specification for dimensions of wheel naves and hub centres for commercial vehicles; Section 3: Specification for road-wheel nuts, studs and bolts
10、for commercial vehicles; Section 5: Road wheels manufactured wholly or partly of cast light alloy for passenger cars; Section 6: Specification for road wheels manufactured wholly or partly of light alloy for mopeds and motor cycles; Section 7: Code of practice for the selection and care of wheels fo
11、r commercial vehicles; Section 8: Code of practice for the selection and care of wheels for passenger cars (including caravans and light trailers); Part 3: Valves; Section 1: Specification for valve dimensions; Section 2: Tyre valve threads 5V1, 5V2, 6V1 and 8V1; Section 3: Tyre valve threads 9V1, 1
12、0V2, 12V1 and 13V1; Section 4: Tyre valve threads 8V2, 10V1, 11V1, 13V2, 15V1, 16V1, 17V1, 17V2, 17V3, 19V1 and 20V1; Section 5: Dimensions for ISO core chamber No. 1 for tyre inflation valves; Section 6: Dimensions for ISO core chamber No. 2 for tyre inflation valves; Section 7: Code of practice fo
13、r the selection and care of tyre inflation valves for passenger cars (including caravans and light trailers); Section 8: Code of practice for the selection and care of tyre inflation valves for commercial vehicles; Part 4: Rim profiles and dimensions; Section 1: Car rims; Section 2: Commercial vehic
14、le rims; 1) As the requirements of Part 2: Section 1 are revised they are being published as separate Sections of Part 4. When this process is complete Part 2: Section 1 will be withdrawn. Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 01:52:18 GMT+00:00 2006,
15、Uncontrolled Copy, (c) BSI BS AU 50-2.0a:1979 BSI 03-2000iii Section 3: Off-the-road rims; Section 4: Agricultural tractor and machine rims; Section 5: Industrial vehicle rims; Section 6: Motorcycle rims; Section 7: Moped rims. A British Standard does not purport to include all the necessary provisi
16、ons of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i to iv, pages 1 to 9 and a
17、back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 01:52:18 GMT+00:00 2006, Uncontroll
18、ed Copy, (c) BSI iv blank Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 01:52:18 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS AU 50-2.0a:1979 BSI 03-20001 0.1 Scope This Section of this Part of BS AU 50 provides definitions and specifies general requirements
19、for the construction and workmanship of rims, wheel naves and hub centres. Further requirements for dimensions and performance of wheel naves, hub centres, wheel fixings and for complete wheels are specified in the other sections of Part 2. Further requirements for rim profiles and dimensions are sp
20、ecified in Part 4. NOTEAs will be seen in Part 1, a given tyre is designed to seat on a wide range of rim contours. Not all tyre/rim combinations have been physically checked for satisfactory mounting by both hand and automatic fitting equipment, and therefore this aspect should be verified before u
21、se. 0.2 Terms and definitions For the purposes of Part 2 of this standard the following terms and definitions apply. 0.2.1 wheels, general 0.2.1.1 well-base or one-piece wheel a wheel that has a rim constructed in one piece incorporating a well formation at or near the centre of the rim, to enable t
22、he tyre beads to be mounted over the rim flanges see Figure 1(a) 0.2.1.2 two-piece wheel a wheel that has a rim comprising two parts see Figure 1(b): 1) a rim base with an integral fixed flange; 2) a detachable flange. NOTETwo-piece rims that have tapered bead seats, either or both of which are inte
23、gral with the rim base, may incorporate the semi-drop-centre design. This latter design incorporates a shallow well to enable the tyre beads to be mounted over the bead seat taper. 0.2.1.3 three-piece wheel a wheel that has a rim comprising three parts see Figure 1(c): 1) a rim base with an integral
24、 fixed flange; 2) a detachable flange; 3) a locking ring for the detachable flange. NOTEThree-piece rims may also incorporate the semi-drop-centre design (see note to 0.2.1.2). 0.2.1.4 four-piece wheel a wheel that has a rim comprising four parts see Figure 1(d): 1) a rim base; 2) an inner detachabl
25、e flange; 3) an outer detachable flange; 4) a locking ring for the outer detachable flange. 0.2.1.5 five-piece wheel a wheel that has a rim comprising five parts see Figure 1(e): 1) a rim base; 2) an inner detachable flange; 3) an outer detachable flange; 4) a taper bead seat ring; 5) a locking ring
26、 for the outer detachable flange and the bead seat ring. 0.2.1.6 divided wheel a wheel so constructed that its two main parts, when joined together with clamping nuts and bolts or equivalent mechanical means at or about the nave, combine to form a rim with two fixed flanges (see Figure 2) 0.2.1.7 wi
27、re wheel a wheel so constructed that its rim is joined to the centre member (shell) by a series of wire spokes (see Figure 3) 0.2.1.8 reversible wheel a wheel so constructed that its wheel disc can be mounted on either face to provide inset (narrow track) or outset (wide track) (see Figure 4) 0.2.1.
28、9 adjustable wheel a wheel so constructed that the rim can be re-positioned axially relative to the wheel disc (see Figure 5) adjustments can be made: 1) manually, or 2) by the power of the vehicle. 0.2.2 wheels, passenger cars 0.2.2.1 offset the distance between the centre line of the rim and the a
29、ttachment face of the wheel nave 0.2.2.2 central nave a nave in which the centre line of the rim is coincident with the attachment face of the wheel nave see Figure 6(a) 0.2.2.3 inset a wheel so constructed that the centre line of the rim is located inboard of the attachment face of the disc. Inset
30、is the distance from the attachment face of the disc to the centre line of the rim see Figure 6(b) Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 01:52:18 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS AU 50-2.0a:1979 2 BSI 03-2000 0.2.2.4 outset a wheel so cons
31、tructed that the centre line of the rim is located outboard of the attachment face of the disc. Outset is the distance from the attachment face of the disc to the centre line of the rim see Figure 6(c) 0.2.2.5 depth a distance between the outer wall of the inner flange of the rim and the attachment
32、face of the wheel nave see Figure 6(a), Figure 6(b) and Figure 6(c) 0.2.3 wheels, heavy commercial vehicles 0.2.3.1 offset the distance between the centre line of the rim and the outer nave face of the wheel disc see Figure 6(d) when wheels are used in twin formation, offset is half the distance bet
33、ween the centre lines of the dual-spaced rims 0.2.3.2 central nave a nave in which the centre line of the rim is coincident with the attachment face of the wheel nave see Figure 6(e) 0.2.3.3 reversed offset the distance between the centre line of the rim and the inner nave face of the wheel disc see
34、 Figure 6(f) 0.2.3.4 depth the distance between the outer wall of the inner flange of the rim and the attachment face of the wheel nave see Figure 6(d), Figure 6(e) and Figure 6(f) 0.2.4 wheels, cast light alloy for passenger cars 0.2.4.1 centre member (disc, spider or spoked) the connection between
35、 the vehicle hub and the wheel rim 0.2.4.2 nave central portion of centre member, where the wheel mounting face and fixing features are usually located (see Figure 7) 0.2.4.3 offset the distance between the mounting face of the nave and the centre line of the rim (see Figure 8). The distance is term
36、ed “positive” (inset) when the rim centre line is inboard of the mounting face, and “negative” (outset) when the rim centre line is outboard of the mounting face 0.2.4.4 wheel loading the mass supported by a wheel 0.2.4.5 specific application wheel a wheel designed to meet the specification determin
37、ed by the vehicle manufacturer 0.2.4.6 general application wheel a wheel designed so that one basic casting may be used for wheels to be utilized for a variety of vehicles 0.2.4.7 radiological standard permanent radiographic record of the basic design of wheel showing the minimum acceptance standard
38、 as agreed between the founder and the wheel manufacturer 0.3 Construction and workmanship 0.3.1 Lateral run-out (“wobble”). The lateral run-out on a truly mounted and revolving wheel, measured on the vertical inside face of the rim flange, shall not exceed the following. Lateral deviation mm a) Pas
39、senger cars and scooters1.5 b) Commercial vehicle, public service vehicle and trailer wheels1.8 c) Tractor, implement and earthmover wheels: up to size 20 diameter4.7 over size 20 diameter6.5 Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 01:52:18 GMT+00:00 200
40、6, Uncontrolled Copy, (c) BSI BS AU 50-2.0a:1979 BSI 03-20003 0.3.2 Radial run-out (“lift”). The difference between highest and lowest points on a truly mounted and revolving wheel, measured at any point on either tyre bead seat, shall not exceed the following. 0.3.3 Rivets 0.3.3.1 Rivet heads shall
41、 be of the crowned type provided that: a) in a well-base and/or semi-drop centre rim, where a rivet is located other than in the tyre bead, the height of the rivet shall not exceed 1.5 mm; where the rim is such that the rim base is basically flat and relatively in the same plane as the bead area onl
42、y 0.4 mm lift of rivet projection shall be permitted; b) no rivet shall be within an area covered by the tyre bead; c) all rivets shall be free from sharp edges. 0.3.3.2 The rim base circumference, measured over the rivets, shall not exceed the specified base circumference by more than 2.8 mm in the
43、 case of vehicles other than passenger cars, motor cycles and scooters. 0.3.4 Welds (steel wheels only). Weld areas on the tyre side of the rim profile shall be free from sharp edges and shall not protrude excessively so as to affect the performance of the tyre. 0.3.5 Flanges. The extremities of fla
44、nges shall be free from sharp edges. Any extension of the rim flanges beyond the minimum width in order to facilitate tyre fitment shall be below the flange diameter. 0.3.6 Securing of divided wheels. The halves of divided wheels shall be secured together by clamping bolts or equivalent mechanical m
45、eans. 0.3.7 Valve apertures. The inside edges of valve apertures shall be free from burrs. For cast light alloy passenger car wheels reference should also be made to 5.7 of BS AU 50-2.5. 0.3.8 Split type flanges (steel wheels for vehicles other than passenger cars, motor cycles, scooters and mopeds)
46、. a) The gap between the ends of the split type flanges when fitted to a new wheel and with the tyre inflated shall be as follows: 1) when a maximum ring is placed on a minimum rim: 3.2 mm minimum; 2) when a minimum ring is placed on a maximum rim: 9.5 mm maximum. These dimensions shall not apply to
47、 side rings with abutting interlocking ends. b) The ends of unused split type flanges shall be substantially in alignment when the rings are in the assembled position. 0.3.9 Wheel or rim size designation. The size designation of wheels/rims shall be shown in the following order by figures representi
48、ng: a) Nominal rim diameter Expressed as a diameter code. b) Rim type the symbol “X” indicates a one-piece rim; the symbol “” indicates a multi-piece rim. c) Nominal rim width Expressed as a width code. d) Rim profile. A letter or letters signifies the tyre-side profile of the rim (example: B, C, D,
49、 E, F etc.). Usually the profile designation follows the nominal rim width. It may, however, precede or include the nominal rim width as shown for agricultural rims in the following examples. e) Off the road The symbol “/” followed by a figure or figures indicating the flange height, expressed as a height code, may be added as an optional marking. f) Examples of size designation (for existing types) Maximum difference mm a) Passenger cars and scooters1.5 b) Com
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