GB/T 3372-2010Rims series for tractors, agricultural and forestry machines (English PDF)

Foreword

This standard was drafted in accordance with the rules given in GB/T 1.1-2009.

This standard replaces GB/T 3372-2000 "Rims series for tractors, agricultural

and forestry machines".

The main differences between this standard and GB/T 3372-2000 are as follows:

- DELETE the ISO foreword;

- ADD the rim contour term (Chapter 3 of this edition);

- ADD the rim marking requirements (Chapter 4 of this edition);

- ADD the rim load requirements (Chapter 5 of this edition);

- ADD the I-55, I-70, I-90 5° deep groove rim (DC) and I-55, I-70, I-90 5° split

rim (DT) (see 7.6); 5° full-sloping bottom rim (TB), which is used for nominal

rim diameter code 21, 24, 25 (see 7.8); 5° semi-deep groove rim (SDC),

which is used for nominal rim diameter code 20, 24, 32 (see 7.9); garden

tires A-type 5° deep groove rim (DC) and split rim (DT) (see 7.10); high-

trafficability agricultural tire rim HF type flat bottom rim (FB) (see 7.11) and

all-terrain vehicle tire AT type rim (see 7.12).

The degree of consistency between this standard and the international standard

ISO 4251-3:2006 "Types (ply rating marked series) and rims for agricultural

tractors and machines - Part 3: Rims" is nonequivalent.

This standard was proposed by the China Petroleum and Chemical Industry

Federation.

This standard shall be under the jurisdiction of the National Tire and Rim

Standardization Technical Committee (SAC/TC 19).

Drafting organizations of this standard: Hangzhou Zhongce Rubber Co., Ltd.,

Shandong Linglong Tire Co., Ltd., National Tractor Quality Supervision and

Inspection Center, Beijing Rubber Industry Research and Design Institute.

1 Scope

This standard specifies the terminology, marking, load, diameter, circumference,

rim contour size, valve hole, rim bead seat's rolling pattern for tractors,

agricultural and forestry machines.

This standard applies to rims for tractors and agricultural and forestry machines.

2 Normative references

The following documents are essential to the application of this document. For

the dated documents, only the versions with the dates indicated are applicable

to this document; for the undated documents, only the latest version (including

all the amendments) are applicable to this standard.

GB/T 9769 Rim contour measure

3 Terms of rim contour

The terminology of the rim contour is as shown in Figure 1. The fit of tire and

rim is as shown in Figure 2.

A - Rim's calibration width; B - Rim width; C - Size of rim radius position; D - Rim's

calibration diameter; F1, F2 - Position size of the valve hole on the rim; G - Rim height;

H - Depth of groove bottom; DF - Peak diameter of bead seat; L - Width of groove

bottom; M - Position size of the groove; P - Width of bead seat; R1 - Rim's joint radius;

R2 - Rim radius; R3 - Bead seat's fillet radius; R4 - Groove top's fillet radius; R5 - Fillet

radius of groove bottom; R6 - Rim end's fillet radius; R7 - Groove side radius; V - Size

of the valve hole or groove; alpha - Angle of groove bottom; beta - Angle of bead seat.

Note 1: The size marked with * is related to the installation and disassembly of the tire

on the rim. It is the minimum size of the rim's groove bottom. M represents the limit

size of the groove bottom position.

Note 2: Groove top's fillet radius R4 and groove bottom's angle alpha are important

parameters for tire installation and removal on the rim.

Note 3: Installation plane, that is, the tire is loaded into the rim from this side or the tire

is removed from this side. For multi-piece rims, the installation plane is the side of the

rim that can be removed.

4 Markings

The specification name of the rim is represented in the form of "nominal rim

diameter ×/- nominal rim width rim contour", or "nominal rim width rim

contour ×/- nominal rim diameter"; examples are as shown in Table 1.

10.50I-12 or 12-10.50I 10.50 I 12

a "x" means one-piece rim; "-" means multi-piece rim.

5 Load

The load and air pressure applied to the rim/wheel shall not exceed the

maximum value recommended by the rim/wheel manufacturer. This value can

be engraved on the rim/wheel. When there is no such marking on the rim/wheel

or the use condition exceeds its recommended value, it shall negotiate with the

rim/wheel manufacturer, to ensure that the rim/wheel is not damaged under the

expected use conditions.

6 Rim diameter and circumference