Common use of Equivalent load Clause in Contracts

Equivalent load. 6.4.1 Dynamic equivalent load When both dynamic radial loads and dynamic axial loads act on a bearing at the same time, the hypothetical load acting on the center of the bearing which gives the bearings the same life as if they had only a radial load or only an axial load is called the dynamic equivalent load. For radial bearings, this load is expressed as pure radial load and is called the dynamic equivalent radial load. For thrust bearings, it is expressed as pure axial load, and is called the dynamic equivalent axial load. (1) Dynamic equivalent radial load For radial bearings this hypothetical load refers to pure radial loads, and for thrust bearings it refers to pure centric axial loads. These loads are designated static equivalent radial loads and static equivalent axial loads respectively. (1) Static equivalent radial load For radial bearings the static equivalent radial load can be found by using formula (6.19) or (6.20). The greater of the two resultant values is always taken for Por. P = X F +Y F LLLLLLLLLL(6.19) or o r o a The dynamic equivalent radial load is expressed by formula (6.17). where, Por = Fr LLLLLLLLLLLLLL(6.20) Pr = XFr +YFa LLLLLLLLLLL(6.17) where, Pr : Dynamic equivalent radial load N Fr : Actual radial load N Fa : Actual axial load N X : Radial load factor The values for X and Y are listed in the bearing tables. (2) Dynamic equivalent axial load As a rule, standard thrust bearings with a contact angle of 90° cannot carry radial loads. However, self-aligning thrust roller bearings can accept some radial load. The dynamic equivalent axial load for these bearings is given in formula (6.18). Pa = Fa +1.2Fr LLLLLLLLLLL(6.18) where, Pa : Dynamic equivalent axial load N Por : Static equivalent radial load N Xo : Static radial load factor Yo : Static axial load factor Fr : Actual radial load N Fa : Actual axial load N The values for Xo and Yo are given in the respective bearing tables. (2) Static equivalent axial load For spherical thrust roller bearings the static equivalent axial load is expressed by formula (6.21). P = F + 2.7F LLLLLLLLLLL(6.21) where, oa a r Poa : Static equivalent axial load N Fa : Actual axial load N Fr : Actual radial load N Fr Fa ≤ 0.55 Fa : Actual axial load N Fr : Actual radial load N

Equivalent load. 6.4.1 Dynamic equivalent load When both dynamic radial loads and dynamic axial loads act on a bearing at the same time, the hypothetical load acting on the center of the bearing which gives the bearings the same life as if they had only a radial load or only an axial load is called the dynamic equivalent load. For radial bearings, this load is expressed as pure radial load and is called the dynamic equivalent radial load. For thrust bearings, it is expressed as pure axial load, and is called the dynamic equivalent axial load. (1) Dynamic equivalent radial load For radial bearings this hypothetical load refers to pure radial loads, and for thrust bearings it refers to pure centric axial loads. These loads are designated static equivalent radial loads and static equivalent axial loads respectively. (1) Static equivalent radial load For radial bearings the static equivalent radial load can be found by using formula (6.19) or (6.20). The greater of the two resultant values is always taken for Por. P = X F +Y F LLLLLLLLLL(6.19) or o r o a The dynamic equivalent radial load is expressed by formula (6.17). where, Por = Fr LLLLLLLLLLLLLL(6.20) Pr = XFr +YFa LLLLLLLLLLL(6.17) where, Pr : Dynamic equivalent radial load N Fr : Actual radial load N Fa : Actual axial load N X : Radial load factor The values for X and Y are listed in the bearing tables. (2) Dynamic equivalent axial load As a rule, standard thrust bearings with a contact angle of 90° cannot carry radial loads. However, self-aligning thrust roller bearings can accept some radial load. The dynamic equivalent axial load for these bearings is given in formula (6.18). Pa = Fa +1.2Fr LLLLLLLLLLL(6.18) where, Pa : Dynamic equivalent axial load N Por : Static equivalent radial load N Xo : Static radial load factor Yo : Static axial load factor Fr : Actual radial load N Fa : Actual axial load N The values for Xo and Yo are given in the respective bearing tables. (2) Static equivalent axial load For spherical thrust roller bearings the static equivalent axial load is expressed by formula (6.21). P = F + 2.7F LLLLLLLLLLL(6.21) where, oa a r Poa : Static equivalent axial load N Fa : Actual axial load N Fr : Actual radial load N Fr Fa ≤ 0.55 Fa : Actual axial load N Fr : Actual radial load N