A device for the installation of rock bolts includes a supporting structure and first and second bolting units mounted to the supporting structure. Each bolting unit is configured for drilling an installation hole and/or for installing a rock bolt into a rock face, wherein the supporting structure is configured for rotatably moving the first and second bolting units about a common axis of rotation. At least one actuator is mounted to the supporting structure and configured for additionally moving at least one of the first and second bolting units.

There is provided a tractor with an improved clutch housing structure, which includes a hydro-static transmission (HST) positioned between a clutch and a secondary transmission, to transmit power. The tractor comprises: a clutch housing with the clutch and the HST positioned inside; a partition to separate the clutch from the HST formed inside the clutch housing; and a heat-radiating opening formed in the partition.

A gearbox for mating either a hydraulic motor or a pneumatic motor to a clamshell lathe, or the like, includes a lower frame member forming a gear housing with an upper frame member as a removable cover. When the cover is removed, an input drive gear and an associated first driven gear can be readily removed and replaced to alter the gear ratio afforded by the gearbox to optimize the output torque when either the hydraulic motor or the pneumatic motor is the power source.

A gearbox having a longitudinally-oriented input shaft for transmitting rotational force from an engine; a gear drive train, for receiving rotational force from the input shaft, which includes a plurality of meshed gear pairs mounted on first and second shafts that are laterally oriented perpendicular to the longitudinally oriented input shaft; and in one aspect a fast-change gear assembly interposed in the gear drive train for changing the torque transfer characteristics of the gearbox.

A modular gear transmission and associated systems. The modular gear transmission has an assembled configuration, and the modular gear transmission includes a first transmission body and a first transmission gear set. The first transmission gear set includes a first protruding gear, a first intermediate gear set including at least one intermediate transmission gear, and a first transmission socket. The first transmission body is configured so that, when the modular gear transmission is in the assembled configuration, the first transmission body engages the first transmission gear set to hold the first transmission gear set in a rotatable configuration. The first protruding gear is configured so that, when the modular gear transmission is in the assembled configuration, the first protruding gear protrudes from the first transmission body and is rotatably engaged with the first intermediate gear set, the first protruding gear configured to rotate around a first referential axis of rotation.

A rotary mechanical system includes a driving machine, a transmission unit that includes a main shaft, a main gear, an auxiliary gear meshing with the main gear, an auxiliary shaft, and a first gear, a gearbox that includes a second gear meshing with the first gear, an input shaft with the second gear fixed, and an output shaft that shifts a rotation speed of the input shaft, and a rotary machine that includes a rotary machine shaft connected to the output shaft. The first gear is a spur gear having a plurality of first tooth portions which are spur teeth whose teeth traces are parallel to the central axis. The second gear has a plurality of second tooth portions which are spur teeth whose teeth traces are parallel to the central axis, and each of which is disposed between the adjacent first tooth portions.

Object: To provide a planetary gear mechanism with a free-wheel mechanism that can prevent seizing of a thrust plate and can increase the degree of freedom in setting of a gear ratio. Means to Solve the Problem: A planetary gear mechanism 100 is a planetary gear mechanism with a free-wheel mechanism for reducing the output of a hydraulic motor 104 and transmitting the reduced output. The planetary gear mechanism 100 includes: a housing 108 configured to be decelerated and rotated; a cover 128 that seals an end surface 126 of the housing; a sun shaft 132 configured to be splined to a motor shaft 106 of the hydraulic motor; a first sun gear 142 formed in one piece with the sun shaft; a first planetary gear 144 meshed with the first sun gear; a carrier 146 that supports a shaft 148 of the first planetary gear; a thrust plate 160 that is disposed toward the cover relative to the first planetary gear, and is configured to restrict a movement of the carrier; a hole 164 that is formed in the thrust plate and through which the first sun gear can be passed; a maintenance hole 166 that is formed in the cover and through which the first sun gear can be passed; and a plug 162 configured to close the maintenance hole.

A speed reducer with a falling-off prevention feature according to an aspect of the disclosure includes: a speed reducer for decelerating rotation from a drive source that generates a rotational force and outputting the decelerated rotation, the speed reducer being mounted to a robot; and a coupling member for coupling the speed reducer to the robot. The coupling member maintains coupling between the speed reducer and the robot irrespective of displacement of the speed reducer relative to the robot.

A portal gear box assembly effective to lift and change the gear ratio of a wheel of an off-road vehicle includes a housing, an input gear sub-assembly, an output gear sub-assembly, and an idler gear sub-assembly effective for linking the input gear to the output gear. The input gear sub-assembly includes an input gear, the output gear sub-assembly includes an output gear, and the idler gear sub-assembly includes at least one idler gear and at least one removable adaptor effective for holding the idler gear in either a first position or a second position different from the first position. The sub-assemblies may also include bearings to facilitate movement of the gears.

An inline gearbox for a land vehicle that includes an engine having a clutch housing for the transmission of rotational force from the engine to one or more wheels for propelling the land vehicle, wherein the inline gearbox includes a fast-change gear assembly.