# US 2009/0260912 A1 · Working Vehicle

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- Number: US 2009/0260912 A1
- Document ID: US20090260912A1
- Status: Published application
- Kind: A1
- Application number: 11/992,255
- Filed: 2006-02-27
- Published: 2009-10-22
- Earliest claimed: 2005-10-04
- Assignees: Yanmar Co., Ltd.
- Inventors: Takayuki Isogai
- Web page: https://patentgrep.com/patent/US20090260912A1

## CPC

- E02F 9/2004: {Control mechanisms, e.g. control levers (control levers per se G05G)}
- B60K 17/10: of fluid gearing
- B60T 7/06: Disposition of pedal
- B60T 11/21: with two pedals operating on respective circuits, pressures therein being equalised when both pedals are operated together, e.g. for steering (steering non-deflectable wheels or endless tracks by differentially driving ground-engaging elements on opposite vehicle sides using brakes as main steering effecting means B62D11/08)
- E02F 9/0866: {Engine compartment, e.g. heat exchangers, exhaust filters, cooling devices, silencers, mufflers, position of hydraulic pumps in the engine compartment}
- E02F 9/2292: {Systems with two or more pumps}
- F16H 59/06: the ratio being infinitely variable
- G05G 5/005: {for preventing unintentional use of a control mechanism (G05G5/28 takes precedence)}
- B60K 17/28: characterised by arrangement, location, or type of power take-off
- B60K 17/344: having a transfer gear
- B60K 26/02: of initiating means or elements
- B60Y 2200/221: Tractors
- B60Y 2200/41: Construction vehicles, e.g. graders, excavators
- B60Y 2200/415: Wheel loaders
- B60Y 2300/143: Speed control
- B60Y 2410/10: Housings
- E02F: DREDGING; SOIL-SHIFTING (winning peat E21C49/00)
- B60K: ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
- B60T: VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL (electrodynamic brake systems for vehicle, in general B60L; brakes per se, i.e. devices where braking effect occurs, including ultimate brake actuators, F16D); ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- F16H: GEARING
- G05G: CONTROL DEVICES OR SYSTEMS INSOFAR AS CHARACTERISED BY MECHANICAL FEATURES ONLY ("Bowden" or like mechanisms F16C1/10; gearings or mechanisms not peculiar to this purpose F16H; speed changing or reversing mechanisms for gearings conveying rotary motion F16H59/00 - F16H63/00)
- B60Y: INDEXING SCHEME RELATING TO ASPECTS CROSS-CUTTING VEHICLE TECHNOLOGY

## Abstract

There is provided a power transmission device for a working vehicle, in which a drive takeoff shaft for front wheels can be easily mounted on or dismounted from a transmission case and hence the workability of assembly, maintenance, and the like can be improved but the cost of manufacturing the transmission case and the like can be easily reduced. In the power transmission device for a working vehicle provided with: an engine mounted on a running vehicle body having front wheels and rear wheels; a hydrostatic continuously variable transmission for variably transmitting power from the engine; and the transmission case for transmitting a transmission output from the hydrostatic continuously variable transmission, the drive takeoff shaft for front wheels for transmitting a driving force to the front wheels and the hydrostatic continuously variable transmission are arranged on a center plate disposed on the front side of the transmission case.

## Claims

### Claim at position 1

-10. (canceled)

### Claim 11

A working vehicle comprising: an engine mounted on a running vehicle body having front wheels and rear wheels; a hydrostatic continuously variable transmission for variably transmitting power from an engine; a transmission case for transmitting a transmission output from the hydrostatic continuously variable transmission; a drive takeoff shaft for the front wheels, which transmits a driving force to the front wheels, and the hydrostatic continuously variable transmission is arranged on a center plate disposed on a front side of the transmission case; a nearly cylindrical shaft cover fitted on a transmission shaft for the front wheels that is connected to the drive takeoff shaft for the front wheels, one end side of the shaft cover being retained by a cover insertion hole formed in a bottom portion of a clutch housing disposed on a front side of the center plate; a universal coupling for connecting the drive takeoff shaft for the front wheels to the transmission shaft for the front wheels is arranged in the clutch housing; and one brake pedal connected to right and left brakes for braking the right and left rear wheels respectively via one brake operating shaft, the brake operating shaft being arranged in a bottom portion, which is located below the hydrostatic continuously variable transmission and the universal coupling of the clutch housing.

### Claim 12 (depends on 11)

The working vehicle as claimed in claim 11, comprising a shift pedal connected to a variable transmission operating part of the hydrostatic continuously variable transmission via a transmission mechanism; a vehicle speed holding mechanism for holding the shift pedal at a depressed position, the vehicle speed holding mechanism being provided with: an engaging part connected to a manual operating lever for holding to vehicle speed; and an engaged arm connected to the shift pedal and having a plurality of engaged claws to be engaged with or disengaged from the engaging part, and is constructed in such a way that the engaging part is held engaged with the engaged claws by a biasing force of an initial position return spring for returning the shift pedal to an initial position from the depressed position to thereby bring a vehicle speed nearly to zero.

### Claim 13 (depends on 12)

The working vehicle as claimed in claim 12, comprising brake operating means for braking the rear wheels; brake system releasing means for forcibly releasing position holding of the shift pedal by the vehicle speed holding mechanism by a braking operation of the brake operating means, a drive system releasing operation of releasing the position holding of the shift pedal by the vehicle speed holding mechanism by the shift pedal and a braking system releasing operation of releasing the position holding of the shift pedal by the vehicle speed holding mechanism by the brake system releasing means which can be performed independently of each other.

### Claim 14 (depends on 13)

The working vehicle as claimed in claim 13, wherein the vehicle speed holding mechanism has the engaging part arranged via an engaging link on the manual operating lever for holding the vehicle speed, the engaging link being connected to a brake pedal as the brake operating means via a release arm as the brake system releasing means for forcibly releasing the engaging part from the engaged claws.

### Claim 15 (depends on 12)

The working vehicle as claimed in claim 12, wherein the transmission operating part is returned to a neutral position from a transmission output position by a biasing force of the initial position return spring for returning the shift pedal to the initial position from the depressed position to thereby bring the vehicle speed nearly to zero.

### Claim 16 (depends on 15)

The working vehicle as claimed in claim 15, comprising stroke stopping means for restricting transmission operation of the transmission operating part, a range of the transmission operation of the transmission operating part, restricted by the stroke stopping means, can be adjusted in association with an adjusting operation of holding a neutral position of the initial position return spring.