Abstract: Provided is an electric actuator (1), including: a driving unit (2) including an electric motor (7); and a motion conversion mechanism unit (3), which is connected in series to the driving unit (2). The motion conversion mechanism unit (3) includes: a nut (30); and a threaded shaft (31). An inner member (N) and an outer member (M), which are coupled to each other so that a rotational torque of the driving unit (2) is transmittable therebetween, are provided in a torque transmission path between the driving unit (2) and the motion conversion mechanism unit (3). The inner member (N) is clearance-fitted into an inner periphery of the outer member (M). A planetary gear carrier (51) included in a speed reducer (8) may be used as the outer member (M), and the nut (30) may be used as the inner member (N).

Abstract: Provided is an electric actuator, including: a driving motor (2); a motion conversion mechanism (6) configured to convert a rotary motion of the driving motor (2) to a linear motion; and a motor case (8) configured to accommodate the driving motor (2), wherein the motor case (8) includes: a motor-case main body (69) configured to accommodate the driving motor (2); and a cap member (32) formed independently of the motor-case main body (69), and mounted to the motor-case main body (69), and wherein the cap member (32) includes: an insertion hole (32a) configured to insert an electrode (33) connected to the driving motor (2); and a connector part (32b) configured to connect a mating connector on which a mating terminal configured to be connected to the electrode (33) is provided.

Abstract: Provided is an electric actuator, comprising: a driving motor (2); a motion conversion mechanism (6) configured to convert a rotary motion of the driving motor (2) to a linear motion in an axial direction parallel with an output shaft (2a) of the driving motor (2); and a transmission gear mechanism (5) configured to transmit a driving force from the driving motor (2) to the motion conversion mechanism (6), wherein a double-row bearing (24) configured to support the motion conversion mechanism (6) is arranged on an opposite side of the driving motor (2) with respect to the transmission gear mechanism (5), and wherein a relationship of L<Dm/2+Db/2 is satisfied, where Dm is an outer diameter of the driving motor (2), Db is an outer diameter of the double-row bearing (24), and L is an axis-to-axis distance (L) between the driving motor (2) and the motion conversion mechanism (6).

Abstract: A ball screw nut (3) in which multiple balls (7) are disposed in rolling tracks configured from shaft-side thread grooves (4A) and nut-side thread grooves (6A), and the threaded shaft (4) or the nut (6) is provided with a deflector member (15) in which multiple circulation grooves that make the rolling tracks into circling paths are formed. In the ball screw nut: one circumferential direction end of at least one of the multiple circulation grooves is disposed at a position that is shifted in one circumferential direction or the other with respect to the one circumferential direction ends of the other multiple circulation grooves. The invention addresses the problem of providing a deflector-type ball screw capable of improving durability with respect to radial loads and moment loads without enlarging the overall shape or providing multiple deflector members.

Abstract: An electric actuator has a housing, an electric motor mounted on the housing, a speed reduction mechanism, and a ball screw mechanism that converts the rotational motion of the electric motor to axial linear motion of a drive shaft. An annular groove is formed on an open end of the blind bore of the housing. The sleeve is axially immovably secured by a annular stopper ring fit into the annular groove. The stopper ring has one notch and a recess formed on its inner circumference near each of its two ends of the stopper ring. A contour of each recess has a circular arc portion and a flat portion. The circular arc portion has a predetermined radius of curvature. The flat portion tangentially extends from the circular arc portion. A width of the opening of the recess is smaller than a diameter of the circular arc portion.

Abstract: A method of manufacturing a bridge-type ball screw (1) with a bridge member (5) fit into a nut bridge window (6). The bridge member (5) has a linking groove (5a) with a rolling track that acts as a circulating path. After the bridge member (5) is fit into the nut bridge window (6), a cylindrical mandrel (8), with projections (9), is inserted into the nut (3). An upper die (10) restricts the upper surface of the bridge member (5) and is lowered while the nut (3) is held between the upper die (10) and the mandrel (8). A connection part is subject to plastic working by the projections (9) of the mandrel (8). The bridge member (5) is simultaneously deformed by the upper die (10) to secure the bridge member (5) into the nut bridge window (6).

Abstract: An electric actuator has a housing with an electric motor mounted on the housing (2). A ball screw mechanism converts rotational motion of the electric motor to an axial linear motion of a drive shaft. A side-cover (13) is detachably mounted to the housing (2). A guide member (14) is mounted on the inner wall of the side-cover (13). The guide member (14) has a substantially “C”-shaped cross-section and includes a recessed groove (14a) axially extending opposite to the drive shaft (7). A rotation-preventing pin (9), mounted on the outer circumference of the threaded screw shaft (15), engages with the guide member (14) to support the threaded screw shaft (15) so that it can be axially moved relative to the housing (2) but cannot be rotated.

Abstract: An electric actuator has a housing (2), an electric motor (3), a speed reduction mechanism (6), a ball screw mechanism (8) and a rotation sensor (9). The ball screw mechanism (8) has a screw thread shaft (23) that moves axially but cannot rotate relative to the housing (8). A nut (24) is inserted over the screw thread shaft (23) and can rotate relative to the housing (2), via a rolling bearing (11), mounted on the housing (2), but cannot move axially. A swing link (13) is arranged to perform the pendulum motion interlocked with the linear motion of the driving shaft (7). A magnet (18) is mounted on the end of a pivotal shaft (17) to form the reference point of the pendulum motion. The position of the driving shaft (7) is detected by the rotation sensor (9) arranged opposite to the magnet (18) via a predetermined air gap.

Abstract: An electric actuator has a housing with an electric motor mounted on the housing (2). A ball screw mechanism converts rotational motion of the electric motor to an axial linear motion of a drive shaft. A side-cover (13) is detachably mounted to the housing (2). A guide member (14) is mounted on the inner wall of the side-cover (13). The guide member (14) has a substantially “C”-shaped cross-section and includes a recessed groove (14a) axially extending opposite to the drive shaft (7). A rotation-preventing pin (9), mounted on the outer circumference of the threaded screw shaft (15), engages with the guide member (14) to support the threaded screw shaft (15) so that it can be axially moved relative to the housing (2) but cannot be rotated.

Abstract: A pick-up style utility vehicle according to the present invention has a front seat, a rear seat, a cargo bed expandable in a front direction, and a screen shield arranged at a front end of the cargo bed. The cargo bed has at least a stationary bottom plate, right and left stationary side panels, a front panel, expandable side panels, and an expandable bottom plate and can be changed between an expanded state in which the cargo bed is expanded in a front direction to a rear portion riding space and a non-expanded state not occupying the space. Each of the expandable side panels and the screen shield are supported by a vehicle body configuring portion so as to be integrally shifted between an expanded position and a non-expanded position.

Abstract: An electric actuator has a housing (2), an electric motor (3), a speed reduction mechanism (6), a ball screw mechanism (8) and a rotation sensor (9). The ball screw mechanism (8) has a screw thread shaft (23) that moves axially but cannot rotate relative to the housing (8). A nut (24) is inserted over the screw thread shaft (23) and can rotate relative to the housing (2), via a rolling bearing (11), mounted on the housing (2), but cannot move axially. A swing link (13) is arranged to perform the pendulum motion interlocked with the linear motion of the driving shaft (7). A magnet (18) is mounted on the end of a pivotal shaft (17) to form the reference point of the pendulum motion. The position of the driving shaft (7) is detected by the rotation sensor (9) arranged opposite to the magnet (18) via a predetermined air gap.

Abstract: A pick-up style utility vehicle according to the present invention has a front seat, a rear seat, a cargo bed expandable in a front direction, and a screen shield arranged at a front end of the cargo bed. The cargo bed has at least a stationary bottom plate, right and left stationary side panels, a front panel, expandable side panels, and an expandable bottom plate and can be changed between an expanded state in which the cargo bed is expanded in a front direction to a rear portion riding space and a non-expanded state not occupying the space. Each of the expandable side panels and the screen shield are supported by a vehicle body configuring portion so as to be integrally shifted between an expanded position and a non-expanded position.