초록 ▼

An undercarriage (12) includes a primary frame (22) and a plurality of secondary frames (26) which in turn carry wheel members (28). The secondary frames (26) are urged to pivot away from the primary frame (12) by spring mechanisms (38). An undercarriage (112) includes a primary frame (122) and a pl

An undercarriage (12) includes a primary frame (22) and a plurality of secondary frames (26) which in turn carry wheel members (28). The secondary frames (26) are urged to pivot away from the primary frame (12) by spring mechanisms (38). An undercarriage (112) includes a primary frame (122) and a plurality of secondary frames (126) which in turn carry wheel members (128). Pivotal movement of the endmost secondary frames (126e) is controlled by spring/shock absorber assemblies (134). Pivotal movement of the center secondary frame (126c) is controlled by a spring/shock absorber/cylinder assembly (136). Spring/shock absorber/hydraulic cylinder assemblies (250) may be used to control the positioning of all of the wheels of an undercarriage (422, 452, etc.).

대표청구항 ▼

An undercarriage comprising: an elongated hollow load bearing primary frame; at least three secondary frames; means supporting the secondary frames at longitudinally spaced points on the primary frame for pivotal movement with respect thereto; at least three primary axles having a first portion posi

An undercarriage comprising: an elongated hollow load bearing primary frame; at least three secondary frames; means supporting the secondary frames at longitudinally spaced points on the primary frame for pivotal movement with respect thereto; at least three primary axles having a first portion positioned within the primary frame and a second portion positioned within one of the secondary frames; means supporting each of the primary axles for rotation both with respect to the primary frame and with respect to its associated secondary frame; primary transmission means positioned within the primary frame for drivingly interconnecting at least two of the primary axles; drive means operably connected to the primary transmission means for actuation thereof whereby the drive means and the primary transmission means effect concurrent rotation of the interconnected primary axles; a plurality of secondary axles each individual to one of the secondary frames and each having a wheel receiving member at one end thereof; at least three wheel members each mounted on and secured to the wheel receiving end of one of the secondary axles; means rotatably supporting the secondary axles in the secondary frames with each of the secondary axles extending out of its secondary frame and being rotatably supported in at least one side of its secondary frame; at least two secondary transmission means each mounted in one of the secondary frames and each drivingly interconnecting one of the primary axles and its associated secondary axle; and a spring and hydraulic cylinder assembly connected between each of the secondary frames and the primary frame for controlling and limiting pivotal movement of the secondary frames relative to the primary frame, for selectively positioning the wheel member mounted on the secondary frames to facilitate skid steering, for selectively positioning the wheel members mounted on the secondary frames to facilitate high speed operation, and for vertically extending and retracting all of the wheel members relative to the primary frame to facilitate operation when loaded and unloaded and to vertically position the undercarriage with respect to an underlying surface.