A driving device in one aspect of the present disclosure includes an electric motor, a worm gear, a gear easing that stores the worm gear, a first fitting portion provided in the electric motor, a second fitting portion provided in the gear casing and fitting to the first fitting portion, and a restriction member that includes a pressure contact portion and a contact portion and restricts displacement of the worm gear along a rotation center axis thereof. The pressure contact portion is in pressure contact with one fitting portion out of the first fitting portion and the second fitting portion, and the contact portion is in contact with the other fitting portion.

An urging member urges a first end of a worm shaft toward a worm wheel via a first bearing. The worm shaft includes a tooth flank forming portion and a non-tooth flank forming portion formed between the first end and the tooth flank forming portion. In a housing, a shaft housing portion that houses the worm shaft includes a substantially straight portion and a reduced diameter portion. The substantially straight portion has a substantially constant bore diameter, and extends in an axial direction of the worm shaft. The reduced diameter portion is arranged on the first end side with respect to the substantially straight portion, and has a bore diameter reduced from a position that overlaps tooth flanks in the axial direction to a position that overlaps the non-tooth flank forming portion in the axial direction.

A compensating arrangement for compensating axial play for a transmission housing unit, having a housing base body and a rotatable shaft, a first guide surface transversely to the axial direction and a second guide surface obliquely to the axial direction, wherein the shaft is supported between the guide surfaces with the interposition of the compensating arrangement, is configured in the shape of a wedge and is displaceable along the second guide surface in a feed direction transversely to the axial direction in order to compensate axial play of the shaft, wherein the transmission housing unit contains a pre-stressed spring element for the compensating arrangement in the feed direction, wherein the compensating arrangement is configured to increase the frictional force at least in the direction opposite the feed direction.

A speed reducer-attached motor includes a rotation shaft on which a worm gear is provided and which is supported rotatably around a central axis via a plurality of bearings, a motor part that is driven to be rotated around the rotation shaft as a central axis, a speed reducer part that includes at least one or more gears which include a worm wheel that is engaged with the worm gear, and a casing on which a shaft accommodation groove that accommodates the rotation shaft, a bearing accommodation recess part that accommodates the bearing, and an accommodation recess part that accommodates the speed reducer part are formed, wherein the shaft accommodation groove, the bearing accommodation recess part, and the accommodation recess part open at a top surface portion side of the casing.

A bearing assembly for supporting a helical-wheel shaft of a helical planetary gear, in particular an adjustment device in vehicles for adjusting two mutually adjustable vehicle parts, wherein the helical-wheel planetary gear is a helical-wheel shaft with a helical-gear toothing, which shaft is rotatably mounted about a helical-wheel shaft axis, and a planetary carrier comprising at least three helical planetary gears, each rotatably mounted in the planetary carrier about a planetary gear axis, and each having a planetary gear toothing, wherein the helical gear planetary axes extend obliquely to the helical-wheel shaft axis, and the bearing assembly for supporting the helical gear shaft has a first bearing section and a second bearing section, wherein the first bearing section consists of an axial and radial bearing, and the second bearing section consists of helical-wheel planetary gears, wherein the planetary gear toothing in the second bearing section meshes with the helical-gear toothing.

A worm drive includes a rotatably mounted worm shaft, and a device for compensating an unwanted axial backlash of the worm shaft. The device for compensating the unwanted axial backlash of the worm shaft includes two pressure bodies between which the worm shaft is clamped in the axial direction by a diaphragm spring device. The diaphragm spring is assigned to one of the pressure bodies.

A motor includes a motor unit, a speed reduction mechanism, a motion conversion mechanism, and a housing. The motion conversion mechanism converts rotary motion of the speed reduction. mechanism into reciprocating rotary motion and transmits the motion to an output shaft. The speed reduction mechanism includes a worm, a first gear, and a second gear. The worm is disposed on a rotation shaft of the motor unit. The first gear transmits rotation of the worm and rotates about a first shaft. The second gear receives rotation of the first gear and rotates about a second shaft. The motion conversion mechanism includes a rotary member and a rod. The rotary member includes a sector gear and rotates about an axis of the first shaft. The rod couples the second gear and the rotary member. The output shaft includes an output gear that engages the sector gear.

An electromechanically assisted steering system is proposed, having a worm drive which comprises a worm shaft and a worm gear, an electric motor which has a drive shaft, and a spring element. At an end assigned to the electric motor, the worm shaft has a first bearing portion which is connected to the drive shaft in a torque-transmitting manner. The worm shaft has a second bearing portion which is arranged at an end of the worm shaft remote from the first bearing portion. The spring element is connected to the first bearing portion or to the second bearing portion so as to transmit axial force in the axial direction, such that the spring element axially pretensions the worm shaft relative to the worm gear. A tolerance compensation of the worm drive in the axial direction of the worm shaft is carried out exclusively via the spring element.

Because the pressure angle (=12) of teeth (47) of a worm wheel (46) is larger than the pressure angle (=11) of teeth (45) of a worm (44), tips of the teeth (47) of the worm wheel (46) can be more tapered as compared with a case in which the pressure angle of the teeth of the worm and the pressure angle of the teeth of the worm wheel are the same angle (the conventional case). Thereby, it is possible to ensure non-contact of teeth, which had been variable in terms of contact and non-contact in the case of the conventional form, even if there has been non-uniformity in the teeth (47) of the worm wheel (46).

A power operated scribe saw including a head assembly affixed to a handle assembly. The head assembly includes a frame body, a drive train and a cutting blade. The drive train includes a worm driveshaft and worm rotating about a longitudinal axis of rotation and a blade driveshaft and worm gear rotating about a transverse axis of rotation, the cutting blade rotating with the blade driveshaft. The frame body includes a longitudinal throughbore and a transversely extending recess extending into a first side wall, the throughbore including a seating surface. A worm driveshaft support assembly supports the worm driveshaft for rotation and includes a first bearing engaging the worm drive shaft between the distal end of the worm driveshaft and the worm and a second bearing on the seating surface of the throughbore and engaging the worm drive shaft between the proximal end of the driveshaft and the worm.