Tractor

Patent metadata

Field	Value
Publication number	US-10940901-B2
Application number	US-201615741997-A
Country	US
Kind code	B2
Filing date	Mar 22, 2016
Priority date	Jul 7, 2015
Publication date	Mar 9, 2021
Grant date	Mar 9, 2021

Abstract

A tractor in which various main manipulation parts are arranged on the right side of a driver, to allow the manipulation parts and a steering wheel to be reliably grasped with different hands, thus improving workability for the driver; and the various main manipulation parts are arranged within a semi-arc range over which a right arm of the driver turns about his/her right elbow which rests on an arm rest, thus improving workability for the driver and relieving driver fatigue. The tractor includes an operation unit in which a loader manipulation part and a hydraulic manipulation part are arranged near a driver seat disposed at the rear of a steering wheel, the loader manipulation part and the hydraulic manipulation part being arranged within a semi-arc range over which a right arm of a driver turns about his/her right elbow which rests on a right arm rest of the driver seat.

First claim

The invention claimed is:

1. A tractor comprising:
an operation unit comprising:
a moveable loader manipulation part that includes a mode switch configured to switch a maximum rotational speed and a maximum speed of an engine for a predetermined plurality of modes; and
a hydraulic manipulation part that are arranged near a driver seat disposed rearward of a steering wheel,

wherein the loader manipulation part and the hydraulic manipulation part are arranged along a semi-circular arc in a plan view which translates about a pivot point positioned on a right arm rest of the driver seat.

2. The tractor according to claim 1 , wherein:
a bracket of the hydraulic manipulation part is secured to an outer surface of a fender positioned in a cabin that accommodates the operation unit, and
the outer surface of the fender and at least the bracket of the hydraulic manipulation part and a bracket of the loader manipulation part are collectively covered with a guide member that supports the loader manipulation part and the hydraulic manipulation part.

3. The tractor according to claim 2 , further comprising:
an accelerator-linked main transmission pedal provided forward of the loader manipulation part.

4. The tractor according to claim 1 , further comprising:
an accelerator-linked main transmission pedal configured to control an engine rotation speed or a vehicle speed, the loader manipulation part disposed rearward of the accelerator-linked main transmission pedal; and
wherein the loader manipulation part is positioned closer to a longitudinal centerline of the driver seat than the hydraulic manipulation part is positioned to the longitudinal centerline.

5. The tractor according to claim 1 , wherein the loader manipulation part further includes:
an engine boosting switch configured to activate an engine boost control in which an engine rotation frequency of the engine is raised while a speed change ratio of a hydraulic stepless transmission is lowered to keep a vehicle speed of a tractor constant; and
a valve manipulation switch configured to adjust a hydraulic cylinder of a front loader.

6. The tractor of claim 1 , wherein:
the loader manipulation part further includes:
an engine boosting switch configured to activate an engine boost control in which an engine rotation frequency of an engine is raised while a speed change ratio of a hydraulic stepless transmission is lowered to keep a vehicle speed of a tractor constant;
a valve manipulation switch configured to adjust a hydraulic cylinder of a front loader; and
a first lever; and

the hydraulic manipulation part comprises a plurality of second levers.

7. A tractor comprising:
an operation unit comprising:
a moveable loader manipulation part; and
a hydraulic manipulation part that are arranged near a driver seat disposed rearward of a steering wheel;

a driver seat of the tractor;
a right arm rest;
a fender positioned adjacent to the right arm rest; and
wherein:
the loader manipulation part is disposed on an outer surface of the fender and configured to control a front loader of a tractor;
the hydraulic manipulation part is configured to switch a hydraulic pressure output valve; and
the loader manipulation part and the hydraulic manipulation part:
are attached to the outer surface of the fender; and
are arranged along a semi-circular arc in a plan view which translates about a pivot point positioned on a right arm rest of the driver seat, the semi-circular arc being equidistant from the pivot point.

8. The tractor according to claim 7 , further comprising:
a grasp portion of the loader manipulation part comprising an engine boosting switch, a valve manipulation switch, and a mode switch; and
wherein:
a maximum speed of an engine is set in advance for a plurality of modes.

Assignees

• Yanmar Co Ltd
• Yanmar Power Technology Co Ltd

Inventors

• Miyazaki Takeshi

Classifications

• B62D49/0692 Primary

  characterised by the particular arrangement of control devices, e.g. having more than one control stand, operable from vehicle extension (control devices or systems characterised by mechanical features only) · CPC title

• B62D49/00

  Tractors (of walk type B62D51/04; endless- track features B62D55/00 {; transport specially adapted for underground galleries E21F13/02}) · CPC title

• B60Y2200/221

  Tractors · CPC title

• G05G1/01

  Arrangements of two or more controlling members with respect to one another (double foot control, e.g. for instruction vehicles G05G1/34; mounting units comprising an assembly with two or more pedals G05G1/36) · CPC title

• E02F9/16

  Cabins, platforms, or the like, for drivers ({for motor vehicles in general B62D33/06}, for cranes B66C13/54) · CPC title