Tracked Vehicle Brake Layout With Outer Parking Brake Torque
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Solution Overview
Problem
Existing brake arrangements for tracked vehicles do not efficiently provide a safe and effective parking brake function, particularly in situations where unexpected movement can occur on uneven terrain.
Innovation Solution
A brake arrangement featuring a set of ring-shaped friction elements and a parking brake piston device configured to apply pressure axially, allowing for independent operation of the service and parking brake functions, with a spring device for hydraulic pressure management and a hollow brake axle for compact design, ensuring even pressure distribution and efficient braking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a brake arrangement is provided for tracked vehicles, then parking brake function is enabled to prevent vehicle movement, but the existing arrangements do not efficiently maximize torque and pressure distribution
Solution Approach 1:
The brake arrangement is divided into separate service brake and parking brake systems with independent piston devices. The service brake piston device and parking brake piston device are radially internally and externally arranged respectively, allowing independent operation of each brake function while sharing common friction elements arranged in sets about the drive axle.
Solution Approach 2:
The parking brake piston device is positioned radially externally relative to the service brake piston device, creating a radial dimension separation. This external radial arrangement allows the parking brake to maximize torque by applying pressure to the outer periphery of the friction elements, while the service brake operates internally.
2Device complexity
If service brake and parking brake functions are integrated, then device complexity is reduced, but independent operation of brake functions cannot be achieved
Solution Approach 1:
The brake system is segmented into two independent piston devices: service brake piston device and parking brake piston device. Each piston device has its own activation mechanism and acts on the friction elements independently, allowing separate control of service braking and parking brake functions while maintaining a relatively compact integrated structure.
Solution Approach 2:
The brake arrangement uses a common set of friction elements that can be acted upon by either the service brake piston device or the parking brake piston device. This multi-functional design allows the same friction elements to serve both braking purposes, reducing overall device complexity while maintaining independent operation capability.
3Force
If parking brake piston device is arranged radially externally, then torque is maximized, but device complexity increases
Solution Approach 1:
The parking brake piston device is positioned in the radial dimension externally relative to the service brake piston device. This radial arrangement allows the parking brake to act at the outer periphery of the friction elements, maximizing the moment arm and thereby maximizing brake torque without requiring additional axial or longitudinal space.
Solution Approach 2:
The service brake piston device is arranged radially internally relative to the parking brake piston device, creating a nested configuration where the smaller service brake system is contained within the larger parking brake system. This nesting approach maximizes torque for the parking brake while keeping the overall device structure compact and manageable.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution provides a reliable and efficient parking brake function by maximizing torque and ensuring even pressure distribution, enhancing safety and operational efficiency in preventing vehicle movement during parking.
Implementation Method 1
a set of ring shaped friction elements configured to be pressed together in the axial direction for providing a braking function against said drive axle
Implementation Method 2
a spring device arranged in connection to said parking brake piston device, wherein said spring device, in a non-parking brake activated state, is configured to be compressed by means of providing a hydraulic pressure on said spring device
Implementation Method 3
in connection to a parking brake action, said hydraulic pressure on said spring device is configured to be removed such that said spring device acts on said parking brake piston device by means of a spring force
Data Source
AI summary
Disclosed is a brake arrangement for a tracked vehicle comprising a brake housing. Said brake arrangement is journaled in bearings in connection to a drive unit driven drive axle configured to rotate a drive wheel member. Said brake arrangement comprises a set of ring shaped friction elements arranged about said drive axle and configured to be pressed together in the axial direction for providing a braking function. Said brake arrangement further comprises a ring shaped parking brake piston device coaxially arranged around said drive axle in connection to a radially outer portion of said set of friction elements. Said parking brake piston device is configured to provide pressure in the axial direction against said radially outer portion of said set of friction elements based on a parking brake action so as to press said elements together for preventing rotation of said drive axle, preventing movement of drive wheel member.