LINEAR ACTUATOR TO ADJUST THE VERTICAL POSITION OF A SPRING OF A DAMPING UNIT AND VEHICLE SUSPENSION SPRING AND DAMPER UNIT AND VEHICLE COMPRISING SUCH A SUSPENSION SPRING ACTUATOR

摘要

A damper with a cylinder and a rod, a spring arranged around the damper and a linear actuator arranged to change in a controlled manner the axial position of a bottom end of the spring relative to the cylinder of the damper. The actuator comprises an inner cylindrical element arranged to be mounted around the cylinder of the damper, an outer cylindrical element, which is mounted so as to be axially slidable relative to the inner cylindrical element and is arranged to support the bottom end of the spring, and a working chamber arranged to be filled with a fluid under pressure to adjust the axial position of the outer cylindrical element relative to the inner cylindrical element. The working chamber is delimited, both radially and axially, only by the inner cylindrical element and by the outer cylindrical element. The outer cylindrical element is provided with a support flange arranged to support the bottom end of the spring.

主权项

1. A linear actuator for adjusting the vertical position of a spring of a damper and spring unit for a vehicle suspension, the actuator comprising:
an inner cylindrical element arranged to be mounted around a cylinder of the damper and an outer cylindrical element which is mounted so as to be axially slidable relative to the inner cylindrical element and is arranged to support a bottom end of the spring, wherein the inner cylindrical element and the outer cylindrical element are configured to wholly enclose, both radially and axially, a working chamber arranged to be filled with a fluid under pressure to adjust the axial position of the outer cylindrical element relative to the inner cylindrical element, and wherein the outer cylindrical element is provided with a support flange arranged to support the bottom end of the spring, the support flange being placed beneath the top end of the outer cylindrical element, whereby the outer cylindrical element is at least partially arranged within the volume of the spring, and extending radially outwards with respect to the outer cylindrical element, whereby the inner diameter of the spring is larger than the outer diameter of the outer cylindrical element.