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SECONDARY BRAKE SYSTEM WITH TURN BRAKING ABILITY

IP.com Disclosure Number: IPCOM000173640D
Publication Date: 2008-Aug-18
Document File: 5 page(s) / 138K

Publishing Venue

The IP.com Prior Art Database

Related People

Brian L. Herbst: AUTHOR

Abstract

A secondary brake system providing turn brake capability for an agricultural or other off-road vehicle is disclosed. The system comprises a supply pump capable of supplying hydraulic fluid to other parts of the secondary brake system. A proportional valve is connected to the supply pump and is capable of opening incrementally to allow a variable amount of fluid to flow from the supply pump to other parts of the system or closing to block the flow of fluid to other parts of the system. The vehicle has left and right rear brake mechanisms, each of which is associated with a separate blocker valve. The blocker valves are capable of opening to allow fluid to flow to the rear brake mechanisms when braking actuators located inside an operator station or cab are engaged or closing to block the flow of fluid to the rear brake mechanisms. Both braking actuators may be engaged simultaneously, which stops the motion of both rear wheels and causes the vehicle to stop moving. Alternatively, either the left or right braking actuators may be engaged individually, causing only one wheel to stop and causing the vehicle to turn in the direction of the engaged braking actuator.

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SECONDARY BRAKE SYSTEM WITH TURN BRAKING ABILITY

ABSTRACT

  A secondary brake system providing turn brake capability for an agricultural or other off- road vehicle is disclosed. The system comprises a supply pump capable of supplying hydraulic fluid to other parts of the secondary brake system. A proportional valve is connected to the supply pump and is capable of opening incrementally to allow a variable amount of fluid to flow from the supply pump to other parts of the system or closing to block the flow of fluid to other parts of the system. The vehicle has left and right rear brake mechanisms, each of which is associated with a separate blocker valve. The blocker valves are capable of opening to allow fluid to flow to the rear brake mechanisms when braking actuators located inside an operator station or cab are engaged or closing to block the flow of fluid to the rear brake mechanisms. Both braking actuators may be engaged simultaneously, which stops the motion of both rear wheels and causes the vehicle to stop moving. Alternatively, either the left or right braking actuators may be engaged individually, causing only one wheel to stop and causing the vehicle to turn in the direction of the engaged braking actuator.

BACKGROUND

  An agricultural vehicle has a primary hydraulic braking system that acts on the rear axle of the vehicle. The vehicle also has a secondary electro-hydraulic rear braking system that acts on the rear axle to enable stopping the vehicle if the primary braking system fails. Under some circumstances (e.g., while pulling certain implements) it can be difficult to make sharp turns using only the steering wheel. Under these circumstances, a turn braking system can be used to allow for sharper turns than possible using the wheel alone. In a turn braking scenario, an operator engages either the left or right brake pedal, lever, or other braking actuator. Valves in the braking system open or close as necessary to allow hydraulic fluid to flow to the brake mechanism associated with the braking actuator engaged by the operator. If the left braking actuator is engaged, the left rear brake mechanism is engaged, stopping the motion of the left wheel and causing the vehicle to turn to the left. Similarly, if the right braking actuator is engaged, the right rear brake mechanism is engaged, stopping the motion of the right wheel and causing the vehicle to turn to the right.

  Current primary hydraulic braking systems allow for turn braking. However, current secondary braking systems have only a single proportional valve, which allows for stopping the vehicle in the event of a failure of the primary braking system, but does not allow for turn braking using the secondary brake system. Hence, a secondary brake system that enables turn braking is desired.

DESCRIPTION

  A secondary brake system 1 that enables turn braking is shown in Figure 1. Referring to Figure 1, the secondary brake system...