| US 7,484,580 B2 | ||
| Tractor | ||
| Tatsuo Yamaguchi, Osaka (Japan); Noboru Yamamoto, Osaka (Japan); Bunei Katagiri, Osaka (Japan); and Keiichi Hayashi, Osaka (Japan) | ||
| Assigned to Yanmar Co., Ltd., Osaka (Japan) | ||
| Appl. No. 10/558,182 PCT Filed Jul. 17, 2003, PCT No. PCT/JP03/09131 § 371(c)(1), (2), (4) Date Dec. 21, 2005, PCT Pub. No. WO2004/103760, PCT Pub. Date Dec. 02, 2004. |
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| Claims priority of application No. 2003-146786 (JP), filed on May 23, 2003. | ||
| Prior Publication US 2006/0272867 A1, Dec. 07, 2006 | ||
| Int. Cl. B60K 17/28 (2006.01) | ||
| U.S. Cl. 180—53.6 [74/15.4; 74/15.82] | 2 Claims |
| 1. A tractor comprising a transmission casing, a traveling-system power transmission mechanism provided in the transmission
casing and interposed between an engine and an axle, a PTO-system power transmission mechanism provided in the transmission
casing and interposed between the engine and a PTO shaft, and a changeover mechanism provided in the transmission casing and
interposed between both power transmission mechanisms, wherein
when the power transmission of the PTO-system power transmission mechanism is interrupted at a middle portion thereof by the
changeover mechanism the changeover mechanism is configured so as to be capable of performing a changeover manipulation to
connect a downstream side portion of the PTO-system power transmission mechanism and a downstream side portion of the traveling-system
power transmission mechanism,
the changeover mechanism is comprised of a traveling-system power transmission gear which is mounted on a traveling-system
power transmission shaft which constitutes a portion of the traveling-system power transmission mechanism, a PTO-system power
transmission gear which is mounted on an upstream-side PTO-system power transmission shaft which constitutes a portion of
the PTO-system power transmission mechanism, and a shift gear body which is arranged coaxially with the upstream-side PTO-system
power transmission shaft and is mounted on a downstream-side PTO-system power transmission shaft which constitutes a portion
of the PTO-system power transmission mechanism, and
the shift gear body is formed by mounting a slide member on the downstream-side PTO-system power transmission shaft in an
axially slidable manner and by forming a PTO-system side shift gear which is meshed with the PTO-system power transmission
gear and a traveling-system side shift gear which is meshed with the traveling-system power transmission gear on the slide
member thereby, with the sliding of the slide member, enabling a manipulation to selectively change over the meshing between
the PTO-system power transmission gear and the PTO-system side shift gear and the meshing between the traveling-system power
transmission gear and the traveling-system-side shift gear.
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