![]() For welding a king pin, preheat at the welding position before welding, with the preheating temperature within the range of 200 ~ 300℃, and then use CO2 gas shielded welding to weld. (Table 2-Selection table of bolted king pins) Item No.Īs shown in Figure 5 below. (Table 1- Selection table of welded king pins) If the selected king pin does not match the thickness of the skid plate, the king pin cannot be properly matched with the 5th wheel, or cause abnormal wear of the king pin.įor the selection of a king pin and a skid plate, please refer to the following Table1 and Table 2. The calculation of D value is as follows: The following two factors should be considered when selecting a king pin:ĭifferent semi-trailers have different loading designs, and the D-value of the king pin must meet the semi-trailer’s design requirements to ensure safety of the vehicle. The king pin is a class A force-bearing component on a semi-trailer. The optional skid plate thickness is 8mm, 10mm, 12mm, 14mm and 16mm. The raw material of this kind of king pin generally adopts 40Cr and undergoes quenching and tempering treatment. When the bolted king pin is worn or accidentally damaged or must be replaced duo to other reasons, remove the eight bolts and replace a new interchange head. The bolted king pin is to weld the retention plate on the semi-trailer skid plate, and then fix the interchange head on the retention plate with self-securing bolts. There are also two types of bolted type kingpins: 50# (2”) and 90# (3.5”).Īs shown in Figure 4 below. Components of a bolted type semi trailer king pin) ![]() The bolted king pin consists of a retention plate, a king pin (interchange head) and self-securing bolts. Welded type semi trailer king pins)Īs shown in Figure 3 below. It needs surface carburizing and quenching treatment to enhance wear resistance of its surface. The raw material of this kind of king pin is generally 20CrMnTi. The welded king pin is directly welded to the skid plate of the semi-trailer and cannot be replaced. Welded king pins are available in two models: 50# (2”) and 90# (3.5”). The semi-trailer king pin has two models: 50# (2”) and 90# (3.5”).įor 50# king pins, needing to correspond China standard GB/T 4606-2006 (or referring to ISO 337:1981).įor 90# king pins, needing to correspond China standard GB/T 4607-2006 (or referring to ISO 4086:2001).Īccording to different assembly forms, king pins can be divided into the following two styles:Īs shown in Figure 2 below. The introduction of king pins including the following aspects: The king pin is one of key parts connecting the tractor and the semi-trailer. We recommend undersizing the bushing bore every so slightly so that the kingpin fits tight during assembly - if the kingpin fitment is loose, the bushing will have to be replaced.A king pin is installed on a semi-trailer and cooperates with a fifth wheel on a tractor to realize hooking up and dropping the semi-trailer and the tractor, as shown in Figure 1 below. Frequently check with micrometer and kingpin. It took about 10 minutes to hone each bushing to the proper inside diameter. It's self-centering, very forgiving, and removes material slowly. Without keeping the reamer straight, there is a high risk of over-reaming and/or cutting the bushing crooked.Ĭase in point, we used a brake cylinder hone in place of a reamer. Technically, king pin bushings are supposed to be reamed out using a special reamer in a fixture that attaches to the knuckle and keeps the cutting bit perfectly perpendicular to the face of the bushing.Subtract the two and you'll have an idea of how much material needs to be removed. Use a micrometer to measure the inside diameter of each bushing. ![]() The ACDelco king pins are 1.792" diameter.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |