Ponsse Oyj

Other

Toni Auvinen

Marko Halonen

Yrjö Leinonen

Tommi Liukkunen

Yrjo Leinonen

A pressure medium cylinder () for moving a toothed bar (), comprising a toothed bar () on at least one side of which is formed a toothing (). Inside the toothed bar (), a cavity () is formed, extending to at least one end () of the toothed bar. The pressure medium cylinder () further comprises a longitudinal structure (), the longitudinal structure () and the toothed bar () being adapted movably in relation to each other, and the longitudinal structure () is adapted at least partly inside said cavity (). The toothed bar () and longitudinal structure () are adapted in a sealed manner in relation to each other so that the toothed bar and the longitudinal structure are movable in relation to each other by the effect of a pressure medium.

Pressure medium cylinder and method for moving toothed bar and work machine

A crane arrangement includes a base, a pillar boom, a lifting boom, a folding boom, a lifting cylinder, and a folding cylinder. The lifting boom includes a first pivot point for connecting the pillar boom to the lifting boom, a second pivot point for connecting the lifting cylinder to the lifting boom, and a third pivot point for connecting the folding cylinder to the lifting boom. The lifting boom further includes a hollow cast connecting piece arranged at the first end of the lifting boom, in which connecting piece at least the first pivot point and second pivot point are arranged. The invention also relates to a corresponding work machine.

Crane and work machine

A hoisting apparatus includes a rotation device with connectors for connecting pressure-medium lines to a rotation device, a boom, from which the pressure-medium lines are arranged to lead to the rotation device, and a pivoted joint for suspending the rotation device on the boom. The pivoted joint includes two consecutive pivots in a longitudinal direction of the rotation device. The rotational axes of the pivots are at right-angles to each other. The pressure-medium lines are routed between lugs of the pivot on a boom side of the pivoted joint, past the connectors of the rotation device in the longitudinal direction of the rotation device, to turn towards the connectors to form a hose loop and then routed to the connectors of the rotation device. The pressure-medium lines are arranged on both sides of the rotation device related to a plane defined in the longitudinal direction of the boom and the longitudinal direction of the rotation device.

Arrangement in the hoisting apparatus of a work machine, hoisting apparatus of a work machine, and work machine

An arrangement in a boom system, specifically in a forest machine, includes at least two interlinked boom parts and at least one power transmission connected to the boom parts for moving the boom parts in relation to each other and the environment. The boom part includes an elongated body with a hollow structure and at least one set of joints intersected by turning axles for attaching the boom part to an adjacent structure, and at least one set of attachments for attaching an actuator controlling the boom system to the body, whereby at least one boom part is formed as a uniform, hollow piece made of fluid material. The cross-section of the body is made to cinch toward the midpoint of the body.

Arrangement in boom system

The invention relates to a crane comprising wherein the pressure cylinder is arranged to form an essentially coaxial multi-chamber cylinder with the actuator cylinder to be followed.

Growing community of inventors

Klaukkala, Finland

Toni Auvinen