| 摘要 |
A pison-chamber combination comprising a chamber (1 which is bounded by an inner chamber wal (4) and comprising a piston () in said chamber (2) to he engagingly movable relative to said chamber wal (4) at least between a first position and a second position of the 5 chamber (2), said chamber (2) having crosssections of different crosssectional areas and differing circumferential lengths at the fist and second longitudinal positions, and at least substantially continuously different cross-sectional areas and cicumferential lengths at intennediate longitudinal positions between the first and second longitudinal positions, the cross-sectional area and circumferential length at said second longitudinal position being 10 smaller than the cross-sectional area and circumferendal length at said first longitudinal position, said piton (1is comprising an member (12) for suspension of the sealing 829Lsaid member (12) is rotatableand said sealing (859) is comprising separate part (60 engaging the wail (4) of said chamber (2) and a sealing (B9) made of elastically defonnable impervious material, and mounted on the piston rod (5). 15 This is achieved by the piston (1) is produced to have a production-size of said separate part (6D and said sealing (89) in the stressi-ee and undeformed state thereof in which the circumferential length of the piston (1) is approximately equivalent to the circumferential length of said chamber wall (4) at said second longitudinal position, the piston () being expandable -om its production size in a. direcin transversay with respect to the 20 longitudinal / circular direction of the chamber (2) thereby providing for an expansion of sealing (7) of the piston 1) from the production size thereof during the relative movements of the piston from said second longitudinal position to said first longitudinal /"circular position, one end, closest to a second longitudinal / circular position of the chamberthe sealing ( ) is embedded in a separate part (6,6' said sealing (8,9) of the piston (1) is comprising sealing 25 sections (19,20; 51510 in a direction along the piston rod (5), said sealing (7) is updivided in said sections over the circumference of said sealing (7) and, the angle ( ) in-between two adjaent sealing sections is much less than 18w, one other end, closest to a first longitudinal/ circular position of the chamber, said sealing () is updiided in said sections over the circumference of said sealing (, and, the angle eaY) In-between two adjacent sealing sections 30 is bigger than said angle (f;t, Figs. 33,3C (4/13) p -I-I r 'I I V I -t t t t C' -~' I IL' Fiq~3~3 -- t N ----- * >A. / S 1 iv ~2 I C' A- / 5 Kt q' C - gI/ -u p2,.) 20 jiLt; /Q< I,.) F ~y~SC |
