Work vehicle

Patent metadata

Field	Value
Publication number	US-11156282-B2
Application number	US-201916711759-A
Country	US
Kind code	B2
Filing date	Dec 12, 2019
Priority date	Dec 13, 2018
Publication date	Oct 26, 2021
Grant date	Oct 26, 2021

Abstract

Provided is a work vehicle having a compact braking device. The work vehicle includes a drive shaft part to which power generated by a power source is transmitted and which transmits the power to drive wheels via a differential device, and a drive shaft braking mechanism which generates a braking force on the drive shaft part when a brake pedal is depressed.

First claim

What is claimed is:

1. A work vehicle comprising:
a drive shaft part to which power generated by a power source is transmitted and which transmits the power to drive wheels via a differential device;
a drive shaft braking mechanism configured to generate a braking force on the drive shaft part when a brake pedal is depressed;
an axle braking mechanism configured to generate a braking force on an axle of the drive wheels when a brake lever is operated; and
a link mechanism configured to actuate the drive shaft braking mechanism and the axle braking mechanism when the brake pedal or the brake lever is operated,
wherein the link mechanism is configured to actuate the axle braking mechanism after actuating the drive shaft braking mechanism when the brake pedal or the brake lever is operated.

2. The work vehicle according to claim 1 ,
wherein the link mechanism includes a member having a gap configured such that pivoting of the member caused by operation of the brake pedal or the brake lever is absorbed.

3. The work vehicle according to claim 2 ,
wherein the link mechanism includes a first pivot part that includes: a first pivot plate pivotably attached to the brake pedal, and a second pivot plate that is the member of the link mechanism, wherein the second pivot plate is connected to an axle braking arm of the axle braking mechanism by a link,
an opening is formed in the second pivot plate such that pivoting of the first pivot part is not transmitted to the axle braking arm.

4. The work vehicle according to claim 3 ,
wherein the opening is configured such that, in a released state, the gap is formed between an end of the opening and a pin connecting the link to the second pivot plate such that the axle braking arm is not pivoted until the brake pedal is operated a predetermined amount.

5. The work vehicle according to claim 3 ,
wherein the first pivot part is connected to a drive shaft braking arm of the drive shaft braking mechanism by a link, and
the drive shaft braking arm is configured to be immediately pivoted upon pivoting of the first pivot part.

6. The work vehicle according to claim 2 ,
wherein the link mechanism includes a second pivot part that includes: a first pivot plate connected to a drive shaft braking arm of the drive shaft braking mechanism by a first link, and a second pivot plate that is the member of the link mechanism, wherein the second pivot plate is attached to the brake lever and to an axle braking arm of the axle braking mechanism by a second link,
an opening is formed in the second pivot plate such that pivoting of the second pivot part is not transmitted to the axle braking arm.

7. The work vehicle according to claim 6 ,
wherein the opening is configured such that, in a released state, the gap is formed between an end of the opening and a pin connecting the second link to the second pivot plate such that the axle braking arm is not pivoted until the brake lever is operated a predetermined amount.

8. The work vehicle according to claim 6 ,
wherein the drive shaft braking arm is configured to be immediately pivoted upon pivoting of the second pivot part.

9. The work vehicle according to claim 1 , wherein the axle braking mechanism and the drive shaft braking mechanism are actuated independently.

10. The work vehicle according to claim 9 , further comprising a second pivot part connecting the drive shaft braking mechanism and the axle braking mechanism, the second pivot part including a first pivot plate and a second pivot plate,
wherein the shaft braking mechanism includes a drive shaft braking arm and the axle braking mechanism includes an axle braking arm,
the first pivot plate is connected to the drive shaft braking arm by a link,
the second pivot plate is connected to the axle braking arm by a link, and
a gap is formed in the second pivot plate such that pivoting of the axle braking arm is not transmitted to the second pivot part.

11. A work vehicle comprising:
a drive shaft part to which power generated by a power source is transmitted and which transmits the power to drive wheels via a differential device;
a drive shaft braking mechanism configured to generate a braking force on the drive shaft part when a brake pedal is depressed;
an axle braking mechanism configured to generate a braking force on an axle of the drive wheels when a brake lever is operated; and
an axle braking arm operable between a first state in which a ball engages the movable portion of the clamping part such that the ball causes the movable portion to move toward the disc in the operation position, and a second state in which the ball moves into a ball hole of the movable portion in the non-operation position,
wherein the movable portion is configured to be pivoted by the axle braking arm,
the axle braking mechanism includes: a disc configured to rotate together with the axle, and a clamping part,
the clamping part is configured to be operable between an operation position in which the braking force on the axle is generated through clamping the disc, and a non-operation position;
the first clamping part includes: a fixed portion, and a movable portion, and
the movable portion is configured to contact the disc in the operation position, and to not contact the disc in the non-operation position.

Assignees

• Iseki Agricult Mach

Inventors

• Hisaoka Yasuhiro

Classifications

• B60T8/3215

  Systems characterised by having means acting on components of the drive line, e.g. retarder, clutch or differential gear (B60T8/322 takes precedence) · CPC title

• B60T1/062 Primary

  acting on transmission parts · CPC title

• F16H48/08

  comprising bevel gears · CPC title

• F16H48/24 Primary

  using positive clutches or brakes · CPC title