| 摘要 |
A pneumatic spring consists of a hollow working cylinder (1) with a first end (2) being adapted for fixing to one suspended object and with a second end (12) being closed, a sealed piston rod (60) going through this second end (12), one free end of the sealed piston rod (60) going out of the working cylinder (1) is adapted for fixing to a second suspended object and the second free end interfering into a working space (10) of the working cylinder (1), wherein the working space (10) being closed with the bottom (3) of the working cylinder (1) first end (2) or with a piston (61) connected with the second free end of the piston rod (60) and interconnected through interconnection holes (35) of the working cylinder (1) with an outer storage space (33) of a work medium, wherein according to the invention a cylindrical gear pivot (20) is seated coaxially with the piston rod (60) in the second end (12) of the working cylinder (1), the end of the gear pivot (20) going out of the working cylinder (1) is fitted with actuating means for rotating and/or axially moving the gear pivot (20), and the other end of the gear pivot (20) interfering into the working space (10) is fitted with axial stops (42a, 42b, 42c, 42d) to define the axial movement of a throttle ring (43, 43a, 43b) seated on the gear pivot (20, 20a) or on the piston rod (60) for movement between a first position to close the work medium flow between the working space (10) and outer storage space (33) and a second position to release the working medium flow between the working space (10) and outer storage space (33). To advantage, the throttle ring (43a, 43b) can be seated to slide on the end of the gear pivot (20a), one end of said gear pivot (20a) extending into the working space (10), said throttle ring (43a, 43b) being seated between the axial stops (42c, 42d) and having a tapered outer perimeter or face which, when in a position closing the working medium flow, bears upon the inner shoulder (4a, 4b) of the working cylinder (1), said inner shoulder (4a, 4b) being ananged between the piston (61) or the bottom (3) and interconnection holes (35), and wherein the end of the gear pivot (20a) that extends out of the working cylinder (1) is provided with actuating means to axially move the gear pivot (20a).
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