An apparatus for correcting an imbalance in a rotating shaft along with a method for correcting the imbalance in a rotating shaft is identified. The apparatus includes a joint assembly having a first joint member that is drivingly connected to a second joint member by one or more third joint members. At least a portion of a first shaft may be drivingly connected to at least a portion of the first joint member and at least a portion of a second shaft may be drivingly connected to at least a portion of a second end portion of the second join member. A boot can may be connected to at least a portion of a first end portion of the second joint member. One or more balancing elements may then be connected to at least a portion of the boot can and/or the second joint member of the joint assembly.

A rolling vibration reduction device for an internal combustion engine includes: a main inertial system configured to rotate with a crankshaft of the internal combustion engine; a driving force transmission mechanism configured to transmit a rotational driving force of the crankshaft, a direction of the rotational driving force being reversed by the driving force transmission mechanism; and a sub-inertial system configured to rotate by the rotational driving force transmitted from the driving force transmission mechanism and to reduce rolling vibration of the internal combustion engine associated with rotation of the crankshaft by rotating in an opposite direction to the crankshaft. A torsional resonance frequency in the rolling vibration reduction device is set to a value higher than an explosion primary frequency at a maximum engine speed in a preset operating region of the internal combustion engine.

An assembly for a hybrid drivetrain of a motor vehicle, having a first torque transmission device and a second torque transmission device connected thereto so as to transmit torque. The first torque transmission device is arranged to be axially spaced apart from the second torque transmission device and the second torque transmission device has a smaller radial extension than the first torque transmission device. An installation space for a drivetrain device is defined radially above the second torque transmission device such that said drivetrain device is delimited axially by the first torque transmission device. A spacer device is arranged between the two torque transmission devices in the torque transmission path for axial spacing and is designed such that an axially definable minimum spacing between the defined installation space and the first torque transmission device is maintained and has a balancing device for compensating for imbalance of the assembly.

In a spring balancer apparatus, a flange includes a through-hole and a first and second flange member, the first flange member positioned radially inside a compression spring and removably held on another end of the shaft by a first nut member fastened to a first external thread on the shaft, the second flange member including a central hole and removably fixed to an outer periphery of the first flange member from a rear end plate side. The rear end plate of a casing includes an abutting part on which an outer periphery of the second flange member abuts, and an opening through which a surface of the second flange member is externally exposed at a position radially inside the abutting part and radially outside the central hole. At least one of a front end plate and the rear end plate is removably fixed to a cylindrical body of the casing.

A dynamic damper is provided which includes a weight, an elastic member that supports the weight so as to allow vibration, and a damper case that houses the weight and the elastic member, wherein the dynamic damper also includes corner part checking means for checking at least some corner parts among corner parts where at least one end face of the weight and first and second side faces that are each continuous from the one end face and are adjacent to each other meet. This enables the ease of assembly to be enhanced by enabling a corner part of a weight to be checked when assembling the weight into a damper case, and also enables the state in which the elastic member is mounted on an end part of the weight to be easily checked.

A balance shaft is proposed that includes: i) an unbalance shaft having an unbalance section and an adjacent bearing pin having a cylindrical partial circumference which is oriented towards the shaft imbalance; ii) a bearing ring which surrounds the bearing pin and bears against the cylindrical partial circumference and delimits a free space with a bearing pin back radially opposite thereto; and, iii) a clamping element which is clamped in the free space and clamps the bearing ring radially against the cylindrical partial circumference. The clamping element is intended to secure the bearing ring against axial sliding on both sides on the bearing pin, and the clamping element is connected in an axially interlocking manner to the unbalance shaft on one side and to the bearing ring on the other side.

A balance shaft is proposed that includes: i) an unbalance shaft having an unbalance section and an adjacent bearing pin having a cylindrical partial circumference which is oriented towards the shaft imbalance; ii) a bearing ring which surrounds the bearing pin and bears against the cylindrical partial circumference and delimits a free space with a bearing pin back radially opposite thereto; and, iii) a clamping element which is clamped in the free space and clamps the bearing ring radially against the cylindrical partial circumference. The clamping element is intended to secure the bearing ring against axial sliding on both sides on the bearing pin, and the clamping element is connected in an axially interlocking manner to the unbalance shaft on one side and to the bearing ring on the other side.

A dynamic balancing apparatus includes a dynamic balancing assembly and a plurality of damping particles. The dynamic balancing assembly includes at least two structural members separately arranged on a rotating shaft connected to a rotor, wherein each structural member includes at least one recess portion. The plurality of damping particles are introduced into at least one recess portion of each structural member, such that a centroid of each structural member deviates from the axis. Accordingly, each structural member generates inertial force and moment of inertia as rotation of the rotor to offset another inertial force and moment of inertia generated by centroid deviation of the rotor while rotating to achieve dynamic balance. The plurality of damping particles can move in the recess portion as rotation of the rotor to induce friction and collision so as to achieve the effects of vibration reduction and noise reduction.

A vehicle-mounted electric oil-free air compressor, including a motor, a box body, a piston, and a flywheel shaft. The motor is fixed on the box body, a cylinder cover is at the top of the box body, a main shaft of the motor includes a coupling driving end, the flywheel shaft is driven by an elastic body to rotate. The piston includes a primary intake valve piece and a primary exhaust valve piece, the box body is provided with a secondary cavity, a secondary exhaust valve piece is provided at a vent hole on one side of the cavity, and the primary exhaust valve piece is also a secondary intake valve piece of the compressor, increasing the exhaust pressure. When the piston reciprocates, the stress is balanced and the vibration is small, and with the assistance of a high-efficiency flywheel, the operation of the air compressor is stable.

A dynamic balancing assembly for a laundry apparatus includes a control unit, one or more counterweight devices, and one or more clocksprings. The one or more counterweight devices are configured to be orbited about a primary rotation axis of the laundry apparatus to counteract a load imbalance in a drum of the laundry apparatus. The one or more clocksprings communicatively couple each of the one or more counterweight devices to the control unit.