A dishwasher includes a tub. The dishwasher further includes a spray arm that includes a main arm and an auxiliary arm. The dishwasher further includes a fixed gear part that is connected to the tub, that is configured to rotatably support the main arm, and that includes teeth along an outer circumferential surface of the fixed gear part. The dishwasher further includes a rotating gear part that is connected to the main arm and that is configured to rotate and engage the teeth of the fixed gear part based on rotation of the main arm. The dishwasher further includes a link unit that is connected to the rotating gear part, the main arm, and the auxiliary arm, that is configured to move based on rotation of the rotating gear part, and that is configured to guide reciprocation of the auxiliary arm through the predetermined arc.

A household dishwasher includes a washing container, and a spray facility arranged within the washing container for spraying washing liquor and/or fresh water in the washing container. The spray facility includes a cage, a gyro element rotatably supported in the cage, and a supply line having a nozzle for supplying the washing liquor and/or fresh water to the gyro element. The gyro element is arranged in its entirety above the nozzle in relation to a direction of gravity in an operating position which the gyro element assumes when washing liquor and/or fresh water is supplied to the gyro element.

A dishwasher including a nozzle capable of widening an injection region of washing water includes a main body, a washing tub provided inside the main body, and a nozzle configured to inject washing water into the inside of the washing tub, wherein the nozzle includes an injection port through which the washing water is injected, a guide portion configured to spirally guide the washing water injected through the injection port, and a leg portion configured to connect the guide portion and the injection port.

A dishwasher and method for operating the same utilize a docking arrangement for an elevation-adjustable rack. In some instances, a docking arrangement may include one or more rotatable docking ports to rotate a rotatable conduit supported on the rack, and in some instances, a docking arrangement may include a valve body disposed within a docking port and movable between open and closed positions in a direction generally parallel to an axis of insertion of a conduit into a docking port in response to rotation of a drive.

A dishwasher and method for operating the same utilize a docking arrangement for an elevation-adjustable rack. In some instances, a docking arrangement may include one or more rotatable docking ports to rotate a rotatable conduit supported on the rack, and in some instances, a docking arrangement may include a valve body disposed within a docking port and movable between open and closed positions in a direction generally parallel to an axis of insertion of a conduit into a docking port in response to rotation of a drive.

A dishwasher and method for operating the same utilize a diverter valve to control via rotation the flow of fluid such as wash fluid or pressurized air to a rotatable conduit supported in the rack of a dishwasher. A valve member may be disposed at a predetermined rotational position about an axis of rotation of the conduit such that a fluid inlet on a rotatable valve body may be rotated to the predetermined rotational position to restrict fluid flow to the conduit.

A dishwasher and method for operating the same utilize a check valve in a rotatable docking port to control the flow of fluid such as wash fluid or pressurized air to a rotatable conduit supported in the rack of a dishwasher.

A dishwasher and method for operating the same utilize a rack-mounted rotatable conduit with a return mechanism that positions the rotatable conduit to a predetermined rotational position when the conduit is disconnected from a docking arrangement on a wall of a wash tub.

A dishwasher includes an image-based detergent sensor that in some instances is configured to sense a type of detergent for use in optimizing a wash cycle based upon the type of detergent, and that in some instances is configured to direct one or more controllable sprayers to facilitate dissolution or mixing of detergent into a wash fluid during a wash cycle.

A rack assembly for an automatic dishwasher having opposing side portions, at least two axles extending outwardly from each of the opposing side portions, and a roller wheel mounted to each axle. Each roller wheel roller wheel has a hub adapted to be fixedly attached to the axle, and a wheel rotatably mounted to the hub. A plurality of separators that define pockets is integrally molded with one of the hub or the wheel. Each pocket is adapted to contain one ball bearing such that no two adjacent ball bearings make contact.