GB2156944A - Monotube shock absorber - Google Patents
Monotube shock absorber Download PDFInfo
- Publication number
- GB2156944A GB2156944A GB08408591A GB8408591A GB2156944A GB 2156944 A GB2156944 A GB 2156944A GB 08408591 A GB08408591 A GB 08408591A GB 8408591 A GB8408591 A GB 8408591A GB 2156944 A GB2156944 A GB 2156944A
- Authority
- GB
- United Kingdom
- Prior art keywords
- fluid
- piston
- chamber
- cell
- shock absorber
- 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.)
- Granted
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
- F16F9/06—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium using both gas and liquid
- F16F9/08—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium using both gas and liquid where gas is in a chamber with a flexible wall
- F16F9/088—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium using both gas and liquid where gas is in a chamber with a flexible wall comprising a gas spring with a flexible wall provided within the cylinder on the piston rod of a monotubular damper or within the inner tube of a bitubular damper
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Fluid-Damping Devices (AREA)
Abstract
An unpressurised monotube shock absorber that can operate in a substantially horizontal mode, and which requires major damping in one direction only comprises a cylinder 5 divided into two chambers by a piston 2 and valve 3, one chamber 14 being filled with fluid and capable of being subjected to high pressure by the piston/valve, the other chamber 11 being filled with fluid and a gas filled flexible cell 12 and capable of being subjected to low pressure by the piston/valve. Flow from the chamber 14 into the gas cell containing chamber 11 on compression is throttled by passage 2a, whereas, on movement in the opposite direction, the valve 3 opens to give free flow. In Fig. 2 (not shown) the gas cell is in the other chamber, and the extension stroke is damped. <IMAGE>
Description
SPECIFICATION
Improvements to Shock Absorbers
The present invention is related to unpressurised
monotube shock absorbers for use in a substantially
horizontal mode, requiring major damping in one
direction only.
Shock absorbers working at any angle have
maximum efficiency when the fluid contained is not
permitted to mix with gas; it is especially difficult to preventfluidlgas mixing when operating
horizontally.
It is well known to solve the problem by replacing
either of the end walls of the cylindrical body by a
moving diaphragm, which may be lightly spring
loaded so as to pressurise the fluid. The position of the moving diaphragm is always arranged such that the high pressures created by the damping do not act on the diaphragm. These methods require two dynamic seals, one on the piston rod, the other on the moving diaphragm, and this feature increases the chance of failure by fluid leakage.
According to the present invention, a monotube shock absorber contains fluid and a gas filled flexible cell. The gas is preferably a large molecule gas such as those used in refrigeration processes, and the flexible cell is made from nylon layflat tubing. Damping is produced by fluid flow through a small passage in a piston valve arrangement. The high pressure differences across the piston required to produce major damping do not act on the flexible gas cell due to the arrangement of the high pressure chamber in a position remote from the cell. If a vacuum is produced in the cylinder body due to fluid loss or low temperature or other reasons, the seal will tend to be drawn into the cylinder body. The seal is therefore attached to the rod guide to prevent such displacement, and subsequent fluid loss.
The present invention will now be described, by way of example only, with reference to the accompanying drawings in which:
Figure 1 is an axial section of a monotube shock absorber in accordance with the present invention, and having damping on compression.
Figure 2 is an axial section of a monotube shock absorber in accordance with the present invention, and having damping on extension.
Referring to figure 1 showing a piston rod 1 which carries a piston 2 and valve 3, secured by a nut 4.
The piston rod 1 moves along the axis of the cylinder 5, and passes through rod guide 6 and seal 7. End fittings 9 and 10 are provided to secure the unit to the equipment to be damped. Fluid is contained in the cylinder 5 which is divided into a first chamber 11 with a cell 12 containing gas 13 and a second chamber 14. The rod guide 6 and seal 7 are fitted together by means of an undercut 8 in the rod guide 6. The gas 13 is substantially at atmospheric pressure when the piston rod 1 is fully extended.
The piston 2 is prevented from crushing the cell 12 by indentation in the cylinder 5a. On compression of the unit, the fluid in chamber 14 is under high pressure and is forced through a small passage 2a in the piston 2 and valve 3 arrangement. On extension, the valve 3 flexes to allow fluid to pass from chamber 11 to chamber 14 under minimal pressure difference.
Referring to figure 2 showing a unit in which the damping is performed on the extension stroke. The piston 2 and valve 3 divide cylinder 5 into working chambers 11 containing cell 12 with gas 13, and chamber 14. It will be noted that in this variant the high pressure chamber 14 compresses the seal 7 onto the piston rod 1, and that the design of the seal 7 should take account of the intermittent pressures created. An extra indentation 5b is provided in cylinder 5 to protect seal 7 from piston 2. The operation of the unit is similar to the description for figure 1.
1. Amonotube shock absorber unit comprising a tubular cylinder having an axis and two end walls; a cavity being defined within said cylinder between said end walls; a piston rod passing through at least one of the two said end walls and being movable along said axis; a piston unit and valve unit mounted on said piston rod between said end walls and dividing said cavity into two chambers; the first of said two chambers containing fluid and the second of said two chambers containing fluid and also at least one gas filled flexible cell; said two chambers being interconnected by throttled fluid connection means; said means being arranged such that when fluid passes from said first to said second chamber there is substantial throttling of the fluid and when fluid passes from said second to said first chamber there is no substantial throttling of the fluid.
2. A monotube shock absorber unit as claimed in claim 1 wherein the said piston rod passes through a flexible seal which acts in conjunction with one of the said end walls.
3. A monotube shock absorber unit as claimed in either of the preceding claims wherein a stop is provided to prevent said piston unit from damaging the said cell.
4. A monotube shock absorber unit as claimed in any of the preceding claims wherein the said cell is made from layflat nylon tubing.
5. A monotube shock absorber unit as claimed in any of the preceding claims wherein the said cell is filled with a large molecule gas.
6. A monotube shock absorber unit substantially as hereinbefore described with reference to fig. 1 or fig. 2 of the accompanying drawings.
**WARNING** end of DESC field may overlap start of CLMS **.
Claims (6)
1. Amonotube shock absorber unit comprising a tubular cylinder having an axis and two end walls; a cavity being defined within said cylinder between said end walls; a piston rod passing through at least one of the two said end walls and being movable along said axis; a piston unit and valve unit mounted on said piston rod between said end walls and dividing said cavity into two chambers; the first of said two chambers containing fluid and the second of said two chambers containing fluid and also at least one gas filled flexible cell; said two chambers being interconnected by throttled fluid connection means; said means being arranged such that when fluid passes from said first to said second chamber there is substantial throttling of the fluid and when fluid passes from said second to said first chamber there is no substantial throttling of the fluid.
2. A monotube shock absorber unit as claimed in claim 1 wherein the said piston rod passes through a flexible seal which acts in conjunction with one of the said end walls.
3. A monotube shock absorber unit as claimed in either of the preceding claims wherein a stop is provided to prevent said piston unit from damaging the said cell.
4. A monotube shock absorber unit as claimed in any of the preceding claims wherein the said cell is made from layflat nylon tubing.
5. A monotube shock absorber unit as claimed in any of the preceding claims wherein the said cell is filled with a large molecule gas.
6. A monotube shock absorber unit substantially as hereinbefore described with reference to fig. 1 or fig. 2 of the accompanying drawings.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB08408591A GB2156944B (en) | 1984-04-03 | 1984-04-03 | Monotube shock absorber |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB08408591A GB2156944B (en) | 1984-04-03 | 1984-04-03 | Monotube shock absorber |
Publications (3)
Publication Number | Publication Date |
---|---|
GB8408591D0 GB8408591D0 (en) | 1984-05-16 |
GB2156944A true GB2156944A (en) | 1985-10-16 |
GB2156944B GB2156944B (en) | 1987-06-17 |
Family
ID=10559113
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB08408591A Expired GB2156944B (en) | 1984-04-03 | 1984-04-03 | Monotube shock absorber |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB2156944B (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102009008336B3 (en) * | 2009-02-10 | 2010-09-16 | Zf Friedrichshafen Ag | Vibration damper i.e. tubular damper, has sleeve provided with inner and outer rings, and elastomer part arranged between inner and outer rings, where flexible element is accommodated within elastomer part |
CN108489780A (en) * | 2018-03-02 | 2018-09-04 | 中国科学院深海科学与工程研究所 | One kind is for carrying out the fixed device of chemistry under high pressure |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB581417A (en) * | 1944-03-25 | 1946-10-11 | S S Cars Ltd | Suspension means-for example, for the supporting wheels of a vehicle or aircraft |
GB987111A (en) * | 1960-07-09 | 1965-03-24 | Boge Gmbh | Telescopic shock absorber, especially for motor vehicles |
GB1172555A (en) * | 1966-02-26 | 1969-12-03 | Hoesch Ag | Improvements in or relating to Single-Tube Telescopic Dampers |
GB1239627A (en) * | 1967-07-11 | 1971-07-21 | ||
GB2067710A (en) * | 1980-01-18 | 1981-07-30 | Lucas Industries Ltd | Vehicle suspension unit containing gas in permeable envelope |
GB2072302A (en) * | 1980-03-19 | 1981-09-30 | Creusot Loire | Hydraulic energy absorber |
-
1984
- 1984-04-03 GB GB08408591A patent/GB2156944B/en not_active Expired
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB581417A (en) * | 1944-03-25 | 1946-10-11 | S S Cars Ltd | Suspension means-for example, for the supporting wheels of a vehicle or aircraft |
GB987111A (en) * | 1960-07-09 | 1965-03-24 | Boge Gmbh | Telescopic shock absorber, especially for motor vehicles |
GB1172555A (en) * | 1966-02-26 | 1969-12-03 | Hoesch Ag | Improvements in or relating to Single-Tube Telescopic Dampers |
GB1239627A (en) * | 1967-07-11 | 1971-07-21 | ||
GB2067710A (en) * | 1980-01-18 | 1981-07-30 | Lucas Industries Ltd | Vehicle suspension unit containing gas in permeable envelope |
GB2072302A (en) * | 1980-03-19 | 1981-09-30 | Creusot Loire | Hydraulic energy absorber |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102009008336B3 (en) * | 2009-02-10 | 2010-09-16 | Zf Friedrichshafen Ag | Vibration damper i.e. tubular damper, has sleeve provided with inner and outer rings, and elastomer part arranged between inner and outer rings, where flexible element is accommodated within elastomer part |
CN108489780A (en) * | 2018-03-02 | 2018-09-04 | 中国科学院深海科学与工程研究所 | One kind is for carrying out the fixed device of chemistry under high pressure |
Also Published As
Publication number | Publication date |
---|---|
GB2156944B (en) | 1987-06-17 |
GB8408591D0 (en) | 1984-05-16 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PCNP | Patent ceased through non-payment of renewal fee |