National standards have a significant impact on the design of trailer goosenecks. These standards ensure compatibility, safety and functionality between trailers and tractors. Here is a detailed analysis of how these standards impact trailer gooseneck design, based on search results:
1. Standardization of gooseneck profile
The ISO 1726-2:2007 standard specifies the profile dimensions of goosenecks to ensure interchangeability between tractors with low coupling heights and semi-trailers with high capacities. These dimensions include optimized gooseneck profiles and operating dimensions in relation to angle values. These regulations are mainly intended to allow semi-trailers to be coupled to two-axle tractors, but do not exclude three-axle tractors that comply with the requirements of ISO 1726-2:2007.
Specific impacts include:
- The gooseneck must be located on an outer surface consisting of different planes and a rotating surface, which are connected in sequence without forming steps.
- The design of the gooseneck must include a first plane (AB), a second plane (BC), a third plane (CD) and a surface of revolution (defined by radii r2 and r3).
- The dimensional parameters of the gooseneck include: the length of the first plane L1 = 500 mm, the combined length of the first and second planes L2 = 1350 mm, the length of the fourth plane L3 = 1800 mm, the radius of the arc between the third plane and the vertical part r2 = 450 mm, the radius between the coupling pin (kingpin) axis and the vertical part r3 = 2100 mm.
2. Angle limit between tractor and semi-trailer
The ISO 1726-2:2007 standard also specifies angle limits between the tractor and semitrailer to ensure that there is no contact between the two when driving in a straight line. This includes:
- The forward inclination angle (ω1) does not exceed 3.5°;
- Caster angle (ω2) does not exceed 4.5°;
- At a maximum roll angle (δ) of 2°, there should be no contact between the tractor chassis and the semi-trailer.
3. Interchangeable dimensions of gooseneck part
The standard also specifically mentions the interchangeable dimensions of the gooseneck section, which are critical to ensuring that trailers from different manufacturers are compatible with a variety of tractors. For example, the standard stipulates that the radius of the front clearance area (r1) of the gooseneck part should not exceed 2040 mm.
4. Operating dimensions of gooseneck part
ISO 1726-2:2007 also covers the operating dimensions of the gooseneck, which are related to the angle values of the trailer in actual operation. For example, the standard specifies the operating dimensions of a trailer at forward and caster angles relative to the tractor.
5. Design and safety of gooseneck part
The design requirements for the gooseneck part in the standard not only consider interchangeability and operability, but also consider safety. For example, the standard stipulates that at a maximum roll angle of 2°, there should be no contact between the tractor chassis and the semi-trailer, which helps prevent collision or damage in roll situations.
6. Material and strength of gooseneck part
Although the ISO 1726-2:2007 standard does not directly specify the material and strength requirements for gooseneck parts, these requirements are usually determined by manufacturers of tractors and trailers based on other relevant standards (such as ISO 668:2020) and regulations. Manufacturers need to ensure that the materials and design of the gooseneck section can withstand the expected loads and usage conditions.
7. Testing and verification of gooseneck part
Although the test and verification procedures are not detailed in the standard, manufacturers are usually required to conduct tests according to relevant standards to verify whether the design of the gooseneck part meets the requirements for interchangeability, operability and safety. This may include static and dynamic testing, as well as performance evaluation under different load and operating conditions.
The ISO 1726-2:2007 standard has had a profound impact on the design of trailer goosenecks. It not only ensures compatibility between trailers and tractors, but also improves overall transportation efficiency and safety. By following these standards, manufacturers are able to design trailers that comply with international regulations while also meeting specific transportation needs. The application of these standards helps reduce breakdowns and accidents during transportation, and also facilitates trailer maintenance and repair.
