Patent CA-3096065-A1 (CA)
Title: Composite shaft
Inventor: PETHICK JON
IPC: F16C7/00
Filed: 2020-10-13
Abstract: -1¨   Abstract Composite shaft A composite shaft with an end fitting mounted on at least one end of said shaft and a preload structure arranged to provide a biasing force to bias the composite shaft against the end fitting; wherein the end fitting has a first interface surface, the first interface surface being tapered at an angle to the shaft axis; wherein the shaft has a second interface surface for engagement with the first interface surface, the second interface surface being tapered at an angle to the shaft axis, the second interface surface extending axially from a first end to a second end, the shaft being thicker at the second end than at the first end; wherein the shaft has a third interface surface; wherein the preload structure has a fourth interface surface for engagement with the third interface surface; and wherein at least one of the shaft and the preload structure is shaped such that the contact pressure of the third interface against the fourth interface increases from the first end of the shaft to the second end of the shaft. The varying contact pressure of the third interface against the fourth interface (i.e. the contact pressure of the preload structure against the composite shaft) compensates for the varying contact pressure between the first interface and the second interface such that the overall contact pressure between the composite shaft and the end fitting is more even across the axial length of the joint. Thus the force transfer between the composite shaft and the end fitting is more evenly distributed acrossthe joint and therefore more evenly distributed across the composite layers so that overall joint strength is increased (or conversely allowing a reduced size of part for the same equivalent strength, thereby saving weight). CAN_DMS: \135721940\1 Date Recue/Date Received 2020-10-13 Our Reference :55859989-981CA SC/mm STATEMENT OF ENTITLEMENT TO:    The Commissioner of Patents Canadian Intellectual Property Office Place du Portage I, Room C-114 50 Victoria Street Gatineau, Québec K1A 0C9 IN THE MATTER OF a new Canadian Patent application in the name of CROMPTON TECHNOLOGY GROUP LIMITED entitled COMPOSITE SHAFT Pursuant to paragraph 54(2)(a) of the Patent Rules: The Applicant is entitled to apply for a patent. Date Recue/Date Received 2020-10-13 Fig. 1 a _ Interface pressures over joint length a) c) co a) Axial distance along interface Date Re 9u e/Date Re ce ive d 2020-10-13 o co o o mom 0-                                                          Fig . 1 b ,) pressure variation through thickness    11 7 r                                                                     === A _A  ----------------------------------------------------------------------------- MBEEMAIM ,.0 0_ 11119=  ----------------------------------------------------------------- M=M      radial pressure Fig. 2 1- _________________________________________ ______________________ -----    --Aar 30 lir Interface pressures over joint length a) o co a) Axial distance along interface Date Re9ue/Date Re ce ived 2020-10-13 Fig. 3 X ( 7 23 24 21                                                    31 ________________________ re Interface pressures over joint length a) o co µ= a) Axial distance along interface Date Re9ue/Date Re ce ived 2020-10-13 Fig. 4 111011C--11Lµ     A=os:--;orjf µ,4.1 114re :ASS   Fig. 5 A )  __ /A 40  _________ Date Re9ue/Date Re ce ived 2020-10-13