초록 ▼

A vehicle spindle test fixture that permits applying a brake load torque to the spindle or test unit has a loading actuator that will permit high input force levels, while keeping the coupled mass that must be moved during the test operation at a reasonably low level. In testing a vehicle spindle id

A vehicle spindle test fixture that permits applying a brake load torque to the spindle or test unit has a loading actuator that will permit high input force levels, while keeping the coupled mass that must be moved during the test operation at a reasonably low level. In testing a vehicle spindle ideally, the mass carried by the test spindle would be equal to the wheel and tire. Because of larger physical sizes, the linkage design problem has become more difficult. The present invention reduces the total coupled mass for brake torque testing by utilizing a unique linkage arrangement that reduces the size of the input used for brake torque.

대표청구항 ▼

A linkage assembly used to transfer rotary motion to a specimen which also is moved linearly in a first loading direction comprising: two spaced longitudinal struts of substantially equal length, a plurality of more than two cross links extending between the struts, each of said plurality of cross l

A linkage assembly used to transfer rotary motion to a specimen which also is moved linearly in a first loading direction comprising: two spaced longitudinal struts of substantially equal length, a plurality of more than two cross links extending between the struts, each of said plurality of cross links having first and second ends, the first and second ends of each of the plurality of cross links being pivotally connected to the two longitudinal struts, respectively, first and second of said cross links being pivotally connected to each longitudinal strut at opposite ends of said struts, the first and second ends of each of the plurality of cross links being connected to the respective struts with pivot joints that permit rotation of all of said cross links about generally parallel pivot axes, the pivot joints being compliant in radial directions from the pivot axes, the length of each of the plurality of cross links between the pivot axes at the respective first and second ends of the cross links being different from the lengths between the pivot axes of the first and second ends of all other cross links, and the struts being bendably compliant as the cross links are rotated about the parallel pivot axes to cause the struts to move differentially relative to each other in longitudinal direction; and means to rotate said first cross link about its pivot axes to obtain a mechanical advantage of rotation of the second cross link in inverse proportion to the ratio of lengths of the first and second cross links.