EP0049894A2
Expired / Lapsed
EP
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Vortex flow shock absorber with one-way valve
Assignee: Nissan Motor Co Ltd
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Filing: 1981-10-12
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Granted: —
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Expires: 2001-10-12
Abstract
Abstract A vortex flow shock absorber includes a piston (100) having a vortex chamber (128) therein. The piston communicates with one fluid chamber defined in an absorber cylinder via vortex passages (120) and with the other fluid chamber separated from the former by the piston (100) via a flow restricting opening (126). A one-way valve (130, 133) is provided in a piston rod (101) which defines a fluid passage (132, 134) permitting one way flow of the fluid from the vortex chamber (128) to one of the fluid chambers. The one-way valve (130, 133) is responsive to an excessive fluid pressure in the vortex chamber (128) to relieve the fluid pressure exceeding a predetermined value. The piston (100) and a piston rod (101) are attached together by way of pressure welding. This simplifies the assembling operation of the piston (100) onto the piston rod (101).
Inventors
- 👤 Kazuroh Iwata
- 👤 Naoto Fukushima
- 👤 Kunihiko Hidaka
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-08 22:55
CPC Classifications
F; F16; F16F; F16F9/00; F16F9/32; F16F9/34; F16F9/344; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7837; Y10T137/7847; Y10T137/7849
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
97 words
1 . A vortex flow shock absorber having a hollow cylinder with a fluid chamber defined therein, a piston reciprocab- ly disposed within said fluid chamber to divide the fluid chamber into first and second chambers, said piston defining therein a vortex chamber which communicates with said first and second chambers via first and second passages so that the fluid introduced through said first passage produces a vortex flow of the fluid in said vortex chamber, characterized in that said piston (100;200) is attached to a piston rod (101, 201) by way of welding, particularly pressure welding.
Claim 2
Dependent Claim
97 words
1 . A vortex flow shock absorber having a hollow cylinder with a fluid chamber defined therein, a piston reciprocab- ly disposed within said fluid chamber to divide the fluid chamber into first and second chambers, said piston defining therein a vortex chamber which communicates with said first and second chambers via first and second passages so that the fluid introduced through said first passage produces a vortex flow of the fluid in said vortex chamber, characterized in that said piston (100;200) is attached to a piston rod (101, 201) by way of welding, particularly pressure welding.
Claim 3
Dependent Claim
85 words
A shock absorber as set forth in claim 1, characterized in that said piston rod (101;201) is provided with a one-way valve (130, ..., 220,...) for establishing and blocking communication between said first chamber (48) and said vortex chamber (128;206), said one-way valve (130 ..., 220 ...) being responsive to the fluid pressure in said vortex chamber (128;206) to establish communication between said vortex chamber (128;206) and said first chamber (48) when the pressure in said vortex chamber (128;206) becomes greater than a predetermined value.
Claim 4
Dependent Claim
106 words
A shock absorber as set forth in claim 2, characterized in that said one-way valve comprises a groove (132;214) formed in said piston rod (101;201), a communication passage (134;218) transversely extending from said groove (132; 214) of the piston rod (101;201) with respect to the longitudinal axis of said piston rod (101;201) for communication between said groove (132;218) and said first chamber (48), a throughopening (108;216) communicating said vortex chamber (128;206) to said groove (132;214), and a closure member (130,133;220) for permitting the fluid flow through the opening (108;216) and the communication passage (134;218) when the pressure in the vortex chamber (128;206) exceeds said predetermined value.
Claim 5
Dependent Claim
61 words
A shock absorber as set forth in claim 3, characterized in that said one-way valve comprises a ball shaped valve member (130) and a resilient spring (133) urging said ball shaped valve member (130) onto one end of said throug opening (108), said resilient spring (133) defining a set pressure for relieving the fluid pressure in said vortex chamber (128) .
Claim 6
Dependent Claim
77 words
A shock absorber as set forth in claim 3, characterized in that said one-way valve comprises a leaf spring (220) attached to the periphery of said communication passage (218) at one end thereof so that the other end can be displaced from said end of the communication passage (218) for establishing communication between said vortex chamber (206) and said first chamber (48) when the fluid pressure in said vortex chamber (206) becomes greater than a set pressure
References Cited (Backward Citations)
No citation records indexed.
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