摘要:
An adjustment drive for a steering column of a motor vehicle may include a threaded spindle having an external thread, engaging with a corresponding internal thread of a spindle nut. A thread tooth of the external thread and a thread groove of the internal thread have corresponding axially sliding thread flanks that are braced against each other. At least one thread flank comprises at least one recessed lubricant uptake.
摘要:
A linear-motion telescopic mechanism according to the present invention includes a plurality of block members (22) by which an arbitrary arm length is achieved in such a manner that the plurality of block member (22) are rigidly connected to each other so as to elongate a linear-motion telescopic joint (J3). On the other hand, by separating the plurality of block members (22) one by one from a rigid alignment of the plurality of block members (22), the linear-motion telescopic joint (J3) is contracted. The block members (22) unfixed from the rigid alignment are still serially connected but not in a rigid manner. That is, the block members (22) thus unfixed can be flexed in any directions, and therefore can be housed inside a support member (1) in a compact manner. This arrangement can provide a linear-motion telescopic mechanism (i) which enhances safety by eliminating such a risk, inevitable for a typical robot arm having an elbow joint, that an object around the robot arm gets caught between arm sections when the elbow joint is closed, and (ii) which can reduce a space to be occupied by the robot arm.
摘要:
A wave-gear-type linear-actuation mechanism comprises a flat-type wave gear; a lead screw that is a structural component of the wave gear and is formed on an outer peripheral surface of a first circular spline; and a linear-actuation cylinder threaded onto the lead screw, a linear-actuation cylinder 4 having a screw groove that is formed in an inner peripheral surface thereof. It is possible to obtain a linear-actuation mechanism whose holding force during reverse input mode (speed increasing mode) is higher than cases where a cup-type flexible screw is used.
摘要:
A driving apparatus includes a stepping motor having a lead screw, a rack, and a rack-retaining bar, a barrel, a barrel-retaining bar, and a connecting spring for connecting the rack to the barrel. The connecting spring includes an engaging portion that engages with a spherical output member of the rack. The stepping motor in which the lead screw and the rack are integrated with each other and the barrel are connected to each other with provides a structure that absorbs relative positioning error and backlash.
摘要:
A lift drive comprising: a spiral drive element having an axis of rotation, a rack having teeth sized and shaped to be engaged by the spiral drive element, the rack having a longitudinal axis parallel to the axis of rotation, and a motor to rotate the spiral drive element, wherein upon the spiral drive element-rotating, one of the spiral drive element and the rack moves relative to the other along the longitudinal axis.
摘要:
A mechanical oscillator including a shaft having an endless groove in its periphery, a nut body carried by and slidable along the shaft at the location of the endless groove, and a roller pin carried by the nut body, having a nose portion extending into and engaging a wall of the endless groove and having a tail portion disposed deeply in the nut body. A plurality of anti-friction bearings is carried by the nut body, the bearings carrying the roller pin. The anti-friction bearings include both a ball bearing and a needle bearing, the ball bearing being disposed adjacent the nose portion of the roller pin, and the needle bearing being located adjacent the ball bearing and engaged with a tail portion of the roller pin. Multiple roller pins can be used, carried on two carrier strips respectively, which are axially displaced and disposed at opposite sides of the nut body. The carrier strips and associated roller pins can be removed as units, thereby simplifying replacement as required by damage or wear.
摘要:
A driving device for producing substantially linear movement of a driver comprises a shaftless spiral rotatable around its longitudinal axis. The spiral encloses at least one sliding body which is provided with at least one element projecting from the sliding body which passes between two adjoining turns of the spiral. The sliding body co-operates with an element secured against rotational movement which prevents the sliding body from rotating with the spiral. An elongated element oriented in the axial direction of the spiral is connected at one end to the sliding body and at its other end to the element which is secured against rotational movement to form the driver. Upon rotation of the spiral, the sliding body and thereby the driver are moved in the axial direction of the spiral for moving the element secured against rotational movement.
摘要:
A driving device comprising a shaftless spiral rotatable around its longitudinal axis and enclosed by a limiting structure. The limiting structure has a first end region and a second end region corresponding to each end of the spiral. The shaftless spiral encloses a sliding body which is provided with an element projecting radially from the sliding body, between two adjoining spiral turns of the spiral and has a part located radially outside the spiral turns in a slot oriented substantially in the axial direction of the limiting structure. A driving element rotates the spiral, which moves the sliding body and consequently the projecting element in the longitudinal direction of the spiral.
摘要:
There is disclosed a rotary/linear actuator, wherein a flexible sleeve member having a screw thread on its outer surface is arranged to surround a rotary component and a drive motor therefor; the rotary component resiliently deforming the screw thread of the sleeve member outwardly into engagement with an internally threaded outer sleeve member for purposes of imparting linear movement to the sleeve member incident to driven rotations of the rotary component. The actuator incorporates a potentiometer for producing a signal indicative of the position of the sleeve member.
摘要:
In an actuator, a carriage coupled to an item to be displaced with a translatory movement comprises a follower element which defines contact surfaces engaged against the flanks of the thread of a micrometric screw. The contact surfaces co-operate with the thread of the screw only over a small angular portion thereof. The follower element of the carriage is held on the thread of the screw by resilient thrust means acting on the carriage so as to urge it pivotally about an axis (X--X) which is parallel to its direction of translatory movement, being prevented from moving in all the other degrees of freedom. The actuator is especially adapted for use in translator devices in which the level of precision is of the order of a micrometer.