The invention relates to a device (4) for positioning meshing teeth (3, 8, 9) of a gear drive without any play, comprising a gear assembly (5), which gear assembly (5) comprises a main gear (6) having first teeth (8) and a gear (7) that is rotatable relative thereto in the circumferential direction having second teeth (9), and the main gear (6) comprises a hub part (10) on which the rotatable gear (7) is disposed, and a tolerance compensating element (12) comprising a shaft part (13) and a compensating part (14) is disposed radially underneath the main gear (6), and the compensating part (14) is connected to the shaft part (13) and to the hub part (10) of the main gear (6) so that the main gear (6) is connected exclusively via the compensating part (14) to the shaft part (13), and the compensating part (14) is made at least partially from a rubber elastic material.

A drive apparatus includes a housing, an electric motor arranged in the housing, and a worm gear mechanism arranged in the housing. The worm gear mechanism includes a worm gear arranged on a rotor shaft of the electric motor and a gearwheel in engagement with the worm gear and fixedly connected to an output shaft so as to rotate with the output shaft. The electric motor is axially mounted in the housing with one axial end via a stop element and with the opposite axial end via an axial clamping element. The axial clamping element has a spring element, a separate floating holding element, and a separate elastomer element. The holding element is arranged axially between the spring element and the elastomer element.

A clearance adjustment mechanism (14) for a gearwheel transmission (12) includes at least one gearwheel (16, 66) with a centerline (39, 67), and a hole (36) in the gearwheel (16, 66) and running substantially parallel with and radially offset from the centerline (39, 67). A spigot (46) insertable in the hole (36) has a threaded portion (48) and a conical portion (50) and fits in the hole (36) such that the centerline (39, 67) moves radially in parallel with the spigot (46) when the spigot is turned in the hole (36). Also a gearwheel transmission (12) with such a clearance adjustment mechanism (14), a combustion engine (4) with such a gearwheel transmission (12), a vehicle (1) with such a combustion engine (4), and a method for adjusting the flank clearance in such a gearwheel transmission (12).

A clearance adjustment mechanism (14) for a gearwheel transmission (12) includes at least one gearwheel (16, 66) with a centerline (39, 67), and a hole (36) in the gearwheel (16, 66) and running substantially parallel with and radially offset from the centerline (39, 67). A spigot (46) insertable in the hole (36) has a threaded portion (48) and a conical portion (50) and fits in the hole (36) such that the centerline (39, 67) moves radially in parallel with the spigot (46) when the spigot is turned in the hole (36). Also a gearwheel transmission (12) with such a clearance adjustment mechanism (14), a combustion engine (4) with such a gearwheel transmission (12), a vehicle (1) with such a combustion engine (4), and a method for adjusting the flank clearance in such a gearwheel transmission (12).

Methods and systems are provided for an adjustable drive gear assembly. In one example, the adjustable drive gear assembly includes a first gear rotatably coupled with a second gear with a spring positioned therebetween. A length of the spring is adjustable by rotating pins engaged with the spring in order to adjust a position of the gears relative to each other.

Methods and systems are provided for an adjustable drive gear assembly. In one example, the adjustable drive gear assembly includes a first gear rotatably coupled with a second gear with a spring positioned therebetween. A length of the spring is adjustable by rotating pins engaged with the spring in order to adjust a position of the gears relative to each other.

A scissor gear oil supplying structure includes: a scissor gear that is provided on an outer the circumference of a tip end portion of a shaft; a first oil passage; a second oil passage that extends from the first oil passage in the radial direction; an extension hole that is opened at the front end surface of the shaft; a female screw that is formed in the first oil passage on the rear side of the second oil passage; a rotating member; and a bolt that is inserted into the extension hole and the first oil passage to fasten the rotating member to the shaft and is screwed into the female screw, in which lubricating oil is guided from the first oil passage to the second oil passage along a gap between thread grooves of the female screw and thread ridges of the bolt.

A scissor gear oil supplying structure includes: a scissor gear that is provided on an outer the circumference of a tip end portion of a shaft; a first oil passage; a second oil passage that extends from the first oil passage in the radial direction; an extension hole that is opened at the front end surface of the shaft; a female screw that is formed in the first oil passage on the rear side of the second oil passage; a rotating member; and a bolt that is inserted into the extension hole and the first oil passage to fasten the rotating member to the shaft and is screwed into the female screw, in which lubricating oil is guided from the first oil passage to the second oil passage along a gap between thread grooves of the female screw and thread ridges of the bolt.

A drive transmission device includes a first gear, a cam configured to rotate in interrelation with rotation of the first gear and capable of changing a state of two members between a pressed state and a pressure-released state, a pressing member configured to press the cam, and a second gear configured to transmit drive to the first gear in engagement with the first gear. At least one of the first and second gears includes first teeth provided at positions corresponding to an engaging region in which the first gear is engaged with the second gear when the state of the two members is changed from the pressure-released state to the pressed state and includes second teeth provided at positions corresponding to a region other than the engaging region. Tooth thicknesses of the first teeth are thicker than tooth thicknesses of the second teeth.

There is provided a ball screw that is used to apply a preload to balls and that has a configuration of achieving a balance between the cooling efficiency and ease of assembly and disassembly. To this end, the ball screw includes a screw shaft, and a plurality of nuts movable relative to the screw shaft in an axial direction. Each of the nuts includes flow channels, which are cooling mechanisms and which respectively serve as independent channels to allow a cooling medium to pass through them. These flow channels are provided symmetrically with respect to a space between the nuts, and are configured so that the cooling medium can independently circulate in each of the nuts.