Hydraulic brake valve enhances mobile
equipment
The
Problem:
Because of the size of much of today's mobile equipment,
hydraulic service brakes are a necessity.
Its
Solution:
A new brake valve was developed to perform two consecutive
functions on mobile equipment driven by hydrostatic transmissions
(HST): first to destroke the HST, and then to apply the vehicle
service brakes. (Some equipment operators describe this logical
combination of functions as inching.) Obviously, less braking
effort is needed when the transmission is not driving.
Depending on the equipment design,
the brake system may have a dedicated pump or it may be tapped
into the main hydraulic system. Typically, an accumulator and
charge valve ensure that pressure is available to operate the
brakes. Inside the brake housing, two spools are mechanically
linked to stroke simultaneously. When the operator depresses the
brake pedal, the 2-position proportional spool connected to the
HST swashplate control modulates that line to tank, and the pump
de-strokes. With the HST in neutral, a pilot system between the
spools allows the 3-position proportional spool to move
independently, to apply the brakes and slow the vehicle. When the
brake pedal lets the valve destroke, the brakes release, and the
HST re-engages.
Related
Applications:
Any application in which brake components need to interface and
interact with other systems on the equipment.
How
Hydraulics Improved this Application:
- Activated by push-rod force
- Used with mineral-based
hydraulic oils
- Custom sizing
- Compact
This application was developed by
MICO, Incorporated. To visit the MICO web site, click here.
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