A pneumatic tire for an agricultural vehicle, comprising: a center rib and lugs that are joined integrally with two end surfaces of the center rib, and that are disposed respectively on one side and on another side of the center rib in the width direction thereof so as to be at intervals from each other in the tire circumferential direction on both the one side and the other side, wherein: the center rib has a width of from 30% to 50% of a tread width of the tread portion, and within a range where the lugs are disposed at 25% or greater of the tread width from the equator, the lugs are formed at an angle of from 20° to 50°, relative to a tire rotation axis direction, on an opposite side from a tire rotation direction, and a sum total of a surface area of ground-contacting surfaces of all of the lugs is from 4.5% to 15% of a surface area of the tread portion in a case in which the tread portion is unrolled as a flat surface and seen in plan view.

Agricultural vehicle tire having tread (1) with bearing surface (10) on which main lugs (3) and shorter secondary lugs (3) are formed on each side of the equatorial mid-plane (XX′), each secondary lug (3) interposed between two main lugs (2). The main lugs (2) and secondary lugs (3) make up, in the radial direction, a lens (21, 31) of a first material, each lens (21, 31) surmounted by a second material extending to the contact face of the main lugs and the secondary lugs. The viscous modulus G″1 of the first material is at most 60% of the viscous modulus G″2 of the second material. The complex modulus G*1 of the first material differs from the complex modulus G*2 of the second material, the difference between these complex moduli being at most 30% of the complex modulus G*2 of the second material.

A tread (2) for a driven axle of an agricultural vehicle, having a tread pattern elements (21) extending radially towards the outside from a bearing surface (22), the tread pattern elements having a total number N of tread pattern blocks (21) that are separated axially from one another, the tread pattern blocks having a contact face (211), a leading face (212) and a trailing face (213), the leading face being inclined at an angle α towards the rear with respect to the radial direction in the rolling direction (15) of the tread, the tread having a number n of tread pattern blocks in the case of which the angle α is between 50 degrees and 75 degrees, the number n being at least equal to 0.2×N.

A track system for use with a vehicle includes an attachment assembly connectable to the chassis of the vehicle having a first pivot extending vertically and defining a yaw pivot axis of the track system, and a second pivot extending laterally and defining a pitch pivot axis of the track system. A frame assembly is disposed laterally outwardly from the attachment assembly and connected thereto. The frame assembly includes at least one wheel-bearing frame member. The track system further includes at least one actuator connected between the attachment assembly and the frame assembly for pivoting the frame assembly about the yaw pivot axis, a leading idler wheel assembly at least indirectly connected to the at least one wheel-bearing frame member, a trailing idler wheel assembly at least indirectly connected to the at least one wheel-bearing frame member, at least one support wheel assembly, and an endless track.

A prime mover, such as a tractor, is disclosed. The prime mover includes a drivetrain, a driver assistance system, and a tire pressure control system. The tire pressure control system is equipped with pneumatic components for setting and adapting a tire pressure of at least one of the tires of the prime mover and an attachment to the prime mover. The drivetrain includes at least one drive motor, one gearbox, at least one power take-off, and at least one ancillary unit. The driver assistance system controls the tire pressure control system and includes a computing unit, a memory unit, and an input/output unit. In particular, the driver assistance system includes an automatic tire pressure controller that operates based on a characteristic curve and is configured for optimized control of the tire pressure control system depending on selectable control strategies and/or optimization target variables.

A dual wheel tyre inflation pressure control system including a pair of vehicle wheels having tyre interiors providing first and second fluid chambers. A first valve arrangement is installed remote from the wheels and is connectable to a pressurised fluid source. A second valve arrangement, suitably mounted on one of the wheels, is connected to the first valve arrangement by means of first and second fluid connections. The second valve arrangement is controllably operable to connect the first fluid connection to either fluid chamber. Controlled variation of fluid pressure in and between the fluid connections is provided by the first valve arrangement to control said second valve arrangement for operating the tyre pressure control system to connect the second fluid chamber to the first valve arrangement, and to connect the first and second fluid chambers.

A rotary transmission leadthrough is part of a tire pressure control system for a tire of a vehicle, the tire having a hub mounted in a rotatable manner on an axle, the rotary leadthrough having a stator unit mounted on the axle of the tire in such a manner that its position in the axial direction is adjustable relative to the axle. The stator unit has a disc like end member and a bearing member extending in the axial direction from the end member with a bearing surface on its outer radial surface, the end member projecting outwards in a radial direction from the bearing surface. The bearing member retains an inner bearing shell of a rolling bearing carrying the hub. A connector is mounted on the end member connected to an air supply of the tire pressure control system, and an air conduit connecting the connector with an air passage extending in the axial direction under the bearing surface. An opening in the bearing surface connects to the air passage with an air chamber arranged radially to the outside of the bearing surface. A rotor unit connects to the hub in a torque fit manner, and the rotary unit is arranged radially outside to the bearing member of the stator unit and has a connector in a radial outside position connected to the tire valve of a tire mounted on the hub. An air conduit connecting the connector with the air chamber is arranged between the rotary unit and the bearing member; and a sealing unit is arranged between the bearing surface of the stator unit and the rotary unit having at least two sealing rings held in place and arranged with a spacing between them in the axial direction, the spacing defining the air chamber.

An onboard inflation system for a vehicle such as an agricultural vehicle is disclosed, including a tire mounted on a wheel to form a wheel and tire assembly. The tire includes a tread portion and a tire cavity including an inflation chamber adjacent the tread portion of the tire. A storage chamber is carried by at least one of the wheel and the tire. A compressor arrangement is communicated with both the storage chamber and the inflation chamber. The compressor arrangement is configured to transfer air between the storage chamber and the inflation chamber.

Tire tread with main lugs extending from a tread edge to the equatorial mid-plane on each side of which are a plurality of secondary lugs (4) extending over 40% to 60% of the tread half-width, each secondary lug (4) having a width 20% to 40% of the shortest distance between two main lugs (3). Each main lug (3) comprises, on its trailing lateral face (32), a widened portion (320) of width D1 extending over an axial distance from a tread edge and being joined to the main lug by end face (321) inclined at an angle B1 between 18 degrees and 25 degrees to the circumferential direction. Each secondary lug (4) has end face (43) inclined at an angle 51 with the same orientation as angle B1 with respect to the circumferential direction, angle 51 being between 18 degrees and 25 degrees.

Agricultural vehicle tire having tread (1) with bearing surface (10) on which main lugs (3) and shorter secondary lugs (3) are formed on each side of the equatorial mid-plane (XX′), each secondary lug (3) interposed between two main lugs (2). The main lugs (2) and secondary lugs (3) make up, in the radial direction, a lens (21, 31) of a first material, each lens (21, 31) surmounted by a second material extending to the contact face of the main lugs and the secondary lugs. The viscous modulus G′1 of the first material is at most 60% of the viscous modulus G′2 of the second material. The complex modulus G′1 of the first material differs from the complex modulus G′2 of the second material, the difference between these complex moduli being at most 30% of the complex modulus G′2 of the second material.