EP 0135256 B1 19880525 - SUPERCHARGER ASSEMBLY AND ROTOR PHASING FIXTURE
Title (en)
SUPERCHARGER ASSEMBLY AND ROTOR PHASING FIXTURE
Publication
Application
Priority
US 50607583 A 19830620
Abstract (en)
[origin: EP0135256A1] An improved Roots-type blower (10) and fixture (200) for timing rotors (20, 22) and timing gears (36, 38) of the blower during assembly. The blower includes a housing (12) defining generally cylindrical chambers containing the rotors having meshed, helical lobes (20c, 22c). The rotors are fixed to stepped diameter shafts (24, 26) pressed into stepped bores (20d, 22d) in the rotors. Straight splines on the shafts respectively form mating splines in the rotor bores and in the hub bore of timing gear (36). In a modified form of the blower, the straight splines form matting splines in both timing gears. The shafts are supported in the housing by fixed ball bearings (28, 30) at one end of the rotors and at the other end by ball bearing (32, 34) resiliently biased by springs which preload all four bearings. The fixture includes a base (202) having two surfaces (202f, 240a) for supporting ends (20b, 22b) of the rotors. Surface (202f) is integral with the base and surface (240a) is rotatable relative to surface (202f). The surfaces transversely space the shafts and rotors the same parallel distance apart they will have after final assembly of the blower and provide support of pressing the gears on the shafts. An annular gear (246), fixed to surface (240a) and having the same pitch diameter of rotor lobes (20c, 22c), drives a rack gear (260) which in turn drives a dial indicator (282) providing a direct readout of backlash between the lobe in response to rotation of surface (240a). Springs (268, 272) resiliently bias the rack gear into the annular gear to remove backlash.
IPC 1-7
IPC 8 full level
F04C 18/18 (2006.01); F02B 33/36 (2006.01); F04C 18/12 (2006.01); F04C 18/16 (2006.01); F04C 29/00 (2006.01)
CPC (source: EP)
F04C 18/126 (2013.01); F04C 29/005 (2013.01)
Designated contracting state (EPC)
AT DE FR GB IT
DOCDB simple family (publication)
EP 0135256 A1 19850327; EP 0135256 B1 19880525; AT E34602 T1 19880615; DE 3471505 D1 19880630; JP H0511230 B2 19930212; JP S6011694 A 19850121
DOCDB simple family (application)
EP 84304078 A 19840618; AT 84304078 T 19840618; DE 3471505 T 19840618; JP 12725184 A 19840620