A linear actuator is disclosed having a housing and a plurality of components arranged in the housing. The actuator may include at least one conducting component, a group of mechanical, non-conducting components including components of a spindle mechanism, and at least one bearing arrangement designed to support components of the spindle mechanism in the housing. The at least one conducting component may be separated from the group of mechanical, non-conducting components by at least one seal in such a way that two mutually separate spaces sealed off from one another are formed within the housing.

The present invention provides a linear actuator including the gap compensating unit with the joints and the elastic units to provide the elasticity thereby compensating the offset during the linear motion and maintaining the stability and linearity.

A linear actuator includes a casing that contains a moveable shaft moved by a motor in response to a drive signal and coupled to an encoder that determines an actual instantaneous position of the shaft and forms part of a control loop that adjusts the drive signal so as to ensure accurate positioning of the shaft. A temperature sensor mounted on the shaft produces a temperature signal indicative of instantaneously measured temperature, and a temperature compensator responsive to the measured temperature for generating a negative or positive offset for correcting the drive signal so as to move the shaft to a positon that is corrected for instantaneous expansion or contraction of the shaft owing to departures of the shaft's actual temperature from a known baseline temperature.

Linear actuators and methods for assembling the same are disclosed. A linear actuator according to the disclosure may include a drive unit having a drive shaft, and a spindle mechanism having a spindle, which can be driven by the drive shaft.

A bearing unit may be provided, which may be configured to support a connecting shaft connecting the drive shaft to the spindle and has a bearing block matched to the internal cross section of the housing.

The bearing unit may have a preloading device for preloading a rotary bearing inserted into the bearing block, and the spindle may be screwed to the connecting shaft via a centering portion and a screw fastening portion.

A linear actuator is disclosed having a housing and a plurality of components arranged in the housing. The actuator may include at least one conducting component, a group of mechanical, non-conducting components including components of a spindle mechanism, and at least one bearing arrangement designed to support components of the spindle mechanism in the housing.

The at least one conducting component may be separated from the group of mechanical, non-conducting components by at least one seal in such a way that two mutually separate spaces sealed off from one another are formed within the housing.

As compared to a single-axis actuator in which a ball returning passage of a ball screw mechanism is made of a circulating tube, the cross-sectional shape perpendicular to the longitudinal direction of a threaded shaft of a slider can be made small, when the diameter of the outer circumferential circle of the threaded shaft of the present invention is same as that of the circulating tube type, and the load capacity can be made large, when the size in the longitudinal direction of the threaded shaft of the slider of the present invention is same as that of the circulating tube type. The ball returning passage for returning the balls (4) of a ball screw mechanism from an end point to a start point of a raceway encompasses: a through hole (24) penetrating through a slider (2) in a longitudinal direction of a threaded shaft (3); and end deflectors (6). Each of the end deflector (6) has a direction changing passage to be connected with the through hole (24). A main body (61) of the end deflector (6) is fit into a notch part (26) arranged on each of both ends in the longitudinal direction of the threaded shaft (3) of a slider body (2A).

A linear actuator includes a housing, a transmission assembly, a slider, and a motor. The housing includes a base case and a cover case which are opposite combined with each other. A screw bracket is formed on an outer surface of the base case. The transmission assembly includes a worm and a worm wheel disposed at an end of the worm. The slider is disposed on the housing and engaged with the worm. The motor is screwed to the screw bracket and disposed out of the base case. The motor has an actuating shaft penetrating into the base case and engaged with the worm wheel. The motor can be fixed to the screw bracket in advance, which facilitates the assembly of the transmission assembly to the base case.