Tractor

Patent metadata

Field	Value
Publication number	US-9366303-B2
Application number	US-201414307881-A
Country	US
Kind code	B2
Filing date	Jun 18, 2014
Priority date	Jun 19, 2013
Publication date	Jun 14, 2016
Grant date	Jun 14, 2016

Abstract

A tractor, including: an engine; a forward/backward movement clutch which is provided on a motive power transmission route from the engine to one or more traveling apparatuses, and is configured to carry out changes among forward movement, backward movement, and neutral; one or more brake pedals; and a control unit which is configured to allow, in association with stepping manipulation of the one or more brake pedals, one or more brakes to operate on the one or more traveling apparatuses and allow operating-pressure of the forward/backward movement clutch to lower.

First claim

What is claimed is:

1. A tractor, comprising:
an engine;
a forward/backward movement clutch which is provided on a motive power transmission route from the engine to one or more traveling apparatuses, and is configured to carry out changes among forward movement, backward movement and neutral;
one or more brake pedals;
a control unit which is configured to allow, in association with stepping manipulation of the one or more brake pedals, one or more brakes to operate on the one or more traveling apparatuses and allow operating-pressure of the forward/backward movement clutch to lower from a total pressure; and
one or more sensors which are configured to detect the stepping manipulation of the one or more brake pedals, wherein
the control unit is configured to allow, in response to a detection result of the one or more sensors, the one or more brakes to operate on the one or more traveling apparatuses and allow the operating-pressure of the forward/backward movement clutch to lower from the total pressure,
when a machine body is in a traveling stopping state, the forward/backward movement clutch is held with operating-pressure of a predetermined low pressure,
the operating-pressure of the predetermined low pressure is set higher, as a speed-changing position of an auxiliary speed-changing lever is at a higher speed position,
on an occasion when the stepping manipulation of the one or more brake pedals is released, the operating-pressure of the forward/backward movement clutch is restored to the total pressure,
a pressure raising rate of restoring the operating-pressure of the forward/backward movement clutch to the total pressure is set higher, as the speed-changing position of the auxiliary speed-changing lever is at a higher speed position, and
in case, after the stepping manipulation of the one or more brake pedals is released, stepping manipulation of an accelerator pedal is performed, then the operating-pressure of the forward/backward movement clutch is restored to the total pressure with a pressure raising rate which is higher than the pressure raising rate on the occasion when, after the stepping manipulation of the one or more brake pedals is released, the stepping manipulation of the accelerator pedal is not performed.

Assignees

• Iseki Agricult Mach

Inventors

• Ishida Tomoyuki

Classifications

• F16H61/0246

  characterised by initiating reverse gearshift · CPC title

• F16H2037/049

  Forward-reverse units with forward and reverse gears for achieving multiple forward and reverse gears, e.g. for working machines · CPC title

• B60T1/062 Primary

  acting on transmission parts · CPC title

• B60T7/12

  for automatic initiation; for initiation not subject to will of driver or passenger {(limiting speed of vehicles other than rail vehicles B60K31/00)} · CPC title

• F16D67/06 Primary

  electromagnetically actuated · CPC title