GB1442778A - Hydraulic gear pumps or motors having meshing rotors - Google Patents

Hydraulic gear pumps or motors having meshing rotors

Info

Publication number
GB1442778A
GB1442778A GB4775073A GB4775073A GB1442778A GB 1442778 A GB1442778 A GB 1442778A GB 4775073 A GB4775073 A GB 4775073A GB 4775073 A GB4775073 A GB 4775073A GB 1442778 A GB1442778 A GB 1442778A
Authority
GB
United Kingdom
Prior art keywords
meshing
low
gears
pressure zones
motors
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB4775073A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ZF Friedrichshafen AG
Original Assignee
ZF Friedrichshafen AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by ZF Friedrichshafen AG filed Critical ZF Friedrichshafen AG
Publication of GB1442778A publication Critical patent/GB1442778A/en
Expired legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2/00—Rotary-piston machines or pumps
    • F04C2/08—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
    • F04C2/082—Details specially related to intermeshing engagement type machines or pumps
    • F04C2/086—Carter

Abstract

1442778 Gear-pumps and motors ZAHNRADFABRIK FRIEDRICHSHAFEN AG 12 Oct 1973 [12 Oct 1972] 47750/73 Heading F1F In an hydraulic gear-pump or motor having meshing gears 1, 2 with involute teeth, the highpressure and low-pressure zones 4, 3 encroach upon the intermesh zone DE to the extent that the length of the intermeshing zone which is out of communication with both high-pressure and low-pressure zones, i.e. EG, is equal to the base circle pitch of the gear teeth. This avoids compression of the fluid trapped in the space 6 between the meshing teeth whilst maintaining a seal between high and low-pressure zones, and reduces noise. To form accurately defined high and low-pressure zones, a blind bore 5 may be drilled in one or both side plates of the housing in one or both zones. The bore(s) are located to touch the root circle of one or both gears. The gears may be externally meshing or internally meshing, Fig. 5 (not shown).
GB4775073A 1972-10-12 1973-10-12 Hydraulic gear pumps or motors having meshing rotors Expired GB1442778A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19722249952 DE2249952C3 (en) 1972-10-12 1972-10-12 Hydraulic gear machine

Publications (1)

Publication Number Publication Date
GB1442778A true GB1442778A (en) 1976-07-14

Family

ID=5858797

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4775073A Expired GB1442778A (en) 1972-10-12 1973-10-12 Hydraulic gear pumps or motors having meshing rotors

Country Status (4)

Country Link
DE (1) DE2249952C3 (en)
FR (1) FR2203443A5 (en)
GB (1) GB1442778A (en)
IT (1) IT994772B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5454702A (en) * 1991-11-27 1995-10-03 John S. Barnes Gmbh Invalute gearset

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2701303C3 (en) * 1977-01-14 1983-02-17 Zahnradfabrik Friedrichshafen Ag, 7990 Friedrichshafen Hydraulic gear machine
US4233005A (en) * 1978-01-18 1980-11-11 Lucas Industries Limited Hydraulic gear pump with recesses in non-working gear flanks
DE2810563C2 (en) * 1978-03-10 1982-10-28 Theodorus Henricus Dipl.-Ing. Delft Korse Gear machine (pump or motor)
CH661318A5 (en) * 1981-04-14 1987-07-15 Wankel Felix ROTARY PISTON MACHINE.
JP3830313B2 (en) 1999-09-06 2006-10-04 株式会社ジェイテクト Gear pump

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5454702A (en) * 1991-11-27 1995-10-03 John S. Barnes Gmbh Invalute gearset

Also Published As

Publication number Publication date
FR2203443A5 (en) 1974-05-10
DE2249952A1 (en) 1974-05-09
DE2249952B2 (en) 1974-08-08
DE2249952C3 (en) 1975-03-27
IT994772B (en) 1975-10-20

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Legal Events

Date Code Title Description
PS Patent sealed
746 Register noted 'licences of right' (sect. 46/1977)
PCNP Patent ceased through non-payment of renewal fee