Seating Capacity/Insertion Force
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Seating Capacity/Insertion Force |
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Determination of insertion force of the spring bushing The insertion force is the maximum force required to press the spring bushing into the housing. It depends on how much the bushing is oversized in reference to the nominal OD, the tolerance of the housing bore, the chamfer, the tooth spacing and lubrication used in assembly.An increasing force is applied to the spring bushing until it enters into the housing bore. The force is measured and is classified as the insertion force. Determination of spring bushing seating capacity The seating capacity of the spring bushing corresponds with the pressing force necessary to move the bushing out of the house bore, i.e., to overcome static friction.Inspection bores used for test purposes are, as a rule, more precise than housing bores of manufacturing components. Therefore, laboratory results are for reference values only. It should be noted that the ejection force is somewhat lower than the insertion force.Approximate Ejection Force of Some Bushing Sizes |
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| 1 1/2 x 1 1/4 x 1 1/4 | 450 to 675 lbs |
| 2 x 1 1/2 x 1 1/2 | 495 to 715 lbs |
| 2 3/8 x 2 x 2 | 560 to 785 lbs |
| 2 3/4 x 2 3/8 x 2 3/8 | 580 to 800 lbs |
| 3 1/4 x 2 3/4 x 2 3/8 | 675 to 900 lbs |
| 3 1/2 x 3 x 2 3/4 | 785 to 1000 lbs |
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In many applications, the seating capacity is a dominant factor. It is important that the tolerance of the housing bore meet the requirements of our standards outlined on pages 5 through 7. When higher seating capacity is needed, special measures may be incorporated in manufacturing. These must be agreed to with the customer. CONNEX® Spring Bushing MaterialsSpring Steel AISI 6150Because high resistance to wear and shock loads are required in spring bushings applications, material quality is an important consideration. That is why a high quality spring steel AISI 6150 was selected. |
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| Carbon | 0.48-0.53 | Silicon | 0.15-0.30 |
| Manganese | 0.70-0.90 | Phosphorus | 0.035 Min |
| Chrome | 0.80-1.10 | Sulfur | 0.040 Min |
| Vanadium | 0.15 Min |
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CONNEX Spring Bushings are hardened through to a Rockwell C of 44 to 50. For special applications, the hardness can be lowered or increased depending on the requirements. Spring Bushing InsertionThe recommended way to install our bushing is by using a hydraulic press. However, in practice a hammer and soft mandrel are often used to avoid damaging the bushing. In addition, assembly using pneumatics for insertion is also used. Compared to solid bushings, insertion of the CONNEX Spring Bushing is much simpler. The insertion force of a spring busing is smaller compared to that of a solid bushing. Also, tolerances of the housing bore need not be as close as they are for a solid bushing. Manufacturers are aware of the problems of a solid bushing being damaged during assembly which could result in seizure. Freezing of the parts before assembly helps, but this procedure is both costly and impractical. The advantages of spring bushings are especially valued in the construction and farm machinery industry where on-site replacement is often necessary. Spring Bushing Hardness |
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| *Inexact and only for steel | |||
Spring Bushing LubricationCONNEX Spring Bushings are normally used in highly loaded bearing applications and, as a rule, are not lubricated. However, in some applications, the use of a lubricant with graphite grease serves to reduce noise and restrict the entry of contaminates. Page 7 illustrates the various grease groove and hole options available for carrying the lubricant to the bearing surface. Materials Selection and Component SafetyHigh bearing loads require suitable materials for both bushing and shaft. Suitable shaft materials are AISI 1045 (fg), 4140, 5060, 8620 or other case hardening steels, which can be hardened to a depth of .023 to .030 at Rockwell C 55 to 60. This depth of hardness must be maintained if grinding is to be performed on the shaft. The shaft hardness is an important consideration for component safety and any wear could have an adverse effect on the load carrying capacity. Because the CONNEX Spring Bushing is normally designed as a wear part, it has the additional advantage of being easily replaced. Application of Connex® Spring Bushings Properties of the Connex® Spring Bushings Seating Capacity/Insertion Force Bearing Load Calculations for Connex® Spring Bushings Connex® Spring Bushings Form 1...cold rolled with finished ends- Material: AISI 6150 |
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E-MAIL: info@connexusa.com Voice: 814-474-4550 Fax: 814-474-4577 CONNEX Inc. 7660 Klier Drive N., Fairview, PA 16415 Webmaster: Custom Internet Applications |
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