Title: Hydraulic tank reservoir pressure and vacuum stabilizer system

Abstract: An hydraulic system comprising a displacement-type hydraulic element in communication with a sealed reservoir tank for receiving hydraulic fluid from and returning hydraulic fluid to the reservoir, and a stabilizer for preventing excessive vacuum and pressure from forming within the reservoir as fluid is moved into and out of the same. The stabilizer is carried within the reservoir tank and has a bellows construction for compensating for change of volume in the reservoir as fluid changes take place therein, and the stabilizer is vented to the atmosphere through a breather system constructed to minimize entrance of dirt and the like within the stabilizer.

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Inventors: Matthews, Ralph W. (New Berlin, WI, US)

Application Number: 443303
Filing Date: 1974-02-19
Publication_date: 1976-02-03
Assignee: Caterpillar Tractor Co. (Peoria, IL)
Primary Class(es): 138/30
Other Classes:
US Patent Ref:

2278688	Apr, 1942	Caminez	138/30.
2564711	Aug, 1951	Moyer et al.	220/227.
2731037	Jan, 1956	Schindler et al.	138/30.
3076479	Feb, 1963	Ottung	138/30.
3092969	Jun, 1963	Firth et al.	60/419.
3741250	Jun, 1973	Mercier	138/30.

Other Refs:
Primary Examiner: Christian, Leonard D.
Assistant Examiner:
Attorney: Phillips, Moore, Weissenberger, Lempio & Strabala