CA1276190C - Shock absorbers - Google Patents
Shock absorbersInfo
- Publication number
- CA1276190C CA1276190C CA000511173A CA511173A CA1276190C CA 1276190 C CA1276190 C CA 1276190C CA 000511173 A CA000511173 A CA 000511173A CA 511173 A CA511173 A CA 511173A CA 1276190 C CA1276190 C CA 1276190C
- Authority
- CA
- Canada
- Prior art keywords
- pressure chamber
- piston
- low pressure
- orifice
- 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.)
- Expired - Fee Related
Links
Landscapes
- Fluid-Damping Devices (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
A shock absorber comprises a shielding member to reduce the speed of liquid flowing out through an orifice during the operation of a piston, thereby preventing the liquid from mixing with air within the low pressure chamber.
A shock absorber comprises a shielding member to reduce the speed of liquid flowing out through an orifice during the operation of a piston, thereby preventing the liquid from mixing with air within the low pressure chamber.
Description
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The present invention relates to a shock absorber adapted to provide predetermined shock absorbing characteristics, even when the piston ls operated at short intervals.
The present invention will be lllustrated by reference to the accompanying drawings, in which:-Fig. 1 is a sectional view illustratlny a prior art shock absorber, in which reference numeral 1 designates a casing lU containing oil, reference numeral 2 designates a cylinder formed in the casing 1, reference numeral 3 designates a piston which reciprocates within the cylinder 2, referencP numeral 4 desig-nates a small orifice having a predetermined diameter formed in the piston 3, reference numeral 5 designates a spring causing the piston 3 to return, reference numeral 6 designates hydraulic oil, reference numeral 7 designates a cover, reference numerals 8 and 9 designate seal members, reference numeral 10 designates a high pressure chamber in which a high pressure is produced by the pis-ton 3 during operation, reference numeral 11 designates a low pressure chamber and reference numeral 12 designates an air layer.
Next, the operation of the prior art shock absorber will be described. Referring to Fig. 1, when the piston 3 is pushed by an external force toward the left in Fig. 1, the pres-sure of the hydraulic oil rises within the high pressure chamber 10 and a shock absorbing force is generated against the externalforce. Then, the oil 6 within the high pressure chamber 10 is forced to flow out at a high flow speed into the low pressure chamber 11 through the small orifice ~ and the oil 6 within the low pressure chamber 11 is churned up and mixed wlth air within the air layer I2. The oil is subsequently stabilized as shown in Fig. 2. When the external force is removed, the piston 3 is moved by the spring 5 toward the right in Fig. 1. The oil 6 `: within thé low pressure chamber }1 is forced to flow into the high~pressure chamber 10 through the small oriflce 4. If the SY
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piston 3 is returned within a short tlme after the shock absorb-ing operation, the air mixed in with the oll 6 flows into the high pressure chamber 10.
Therefore, the prior art shock absorber has problems in that regular shock absorbing char~ckeristics cannot be obtained during short interval operatlon because of the air mixing in with the oil 6.
The present invention has been made to eliminate the aforesaid problems and provides a shock absorber adapted to pro-vide regular shock absorbing characteristics.
According to the present invention there is provided a shock a~sorber comprising a piston disposed in a cyli~der con-taining liquid, the piston having a common axis with said cylin-der and dividing the cylinder into a high pressure chamber and alow pressure chamber, the low pressure chamber having an air layer with a free interface between said air layer and said liq-uid, said interface lying generally parallel to the axis of said cylinder, said piston comprising an orifice connecting at a first end with the high pressure chamber and connecting at a second end with the low pressure chamber and with an axis at said second end normal to said interface so that the liquid is forced to flow from the high pressure chamber into the low pressure chamber ~5 through the orifice with the piston is moved toward the high pressure chamber, the shock absorber ~urther comprising a shield-in~ member dlsposed within the low pressure chamber, said shield-ing member fixed in set apart relation to sald second end and lying between said second end and said interface, said member comprising a solid surface normal to the axis of said second end and spaced apart from said second end so as to oppase the flow arPa of the orifice, thereby reducing the speed o~ liquid flow fram the second end of the oriflce. Suitably said plston has a cylindrical portion extending into the low pressure chamber and said shielding member is toroidal ln form and coaxial with said . . :
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cylindrical extension.
The shock absorber according to the prPsenk invention thus includes a shielding member disposed between the orifice formed in the piston and the air layer ~ormed in the low pressure chamber.
The shock absorber according to the present invention is adapted such that the oil flowing out at high speed through the orifice is reduced in flow speed by means of the shielding member during the operation of the piston, thereby preventlng the oil ~rom mixing with the air in the air layer within the low pressure chamber.
- The present invention will be further illustrated by way of the accompanying drawings, in which:-Fig. 1 is a sectional view of the prior art shockabsorber with the piston outward of the cylinder;
Fig. 2 is a s~milar sectional view of the shock absorber of Fig. 1 with the piston in an inwardly of the cylin-der; and Fig. 3 is a sectional view of the shock absorber of one embodiment according to the present invention.
In the Figùres, the same reference denote the same and corresponding parts.
The present invention will be readily clear from the following description in which the preferred embodiment has baen set forth in detail in con~unction with Fig. 3, wherein reference numeral 13 designates a shielding member disposed between the orifice 4 formed~ln the piston 3 and the air layer 12, the other-parts l and 12 being the same as those set forth ln regard to the . ~ . .
.
.
., " ". ~ ~ ' . '. ' - . : . , . :.
.
.
~ ~ 7 prior art shock absorber.
In the shock absorber constructed as stated above, the flow speed of the oil 6 flowiny out of the high pressure chamber 11 at high speed through the orifice ~, is reduced b~ striking against the shielding member 13, when the piston is operated, so that the oil 6 flows into the low pressure chamber 11 at low speed through a gap formed between the piston 3 and khe shielding member 13. Therefore, the oil 6 within the low pressure chamber 11 is not churned up and mixed with the air in the air layer 12, even when the plston is returned within a short tlme after the operation, thereby preventing the air from flowing into the high pressure chamber 10.
` Thus, accordlng to the present invention, a shielding member is provided which reduces the flow speed of the oil flow-ing into the law pressure chamber through the orifice due to the movement of the piston, thereby resulting in stable performance even when the piston is operated at short intervals.
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.
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. . . ' . ' ' , ' .' ~. `' " " - ' ::: ., ` ~ . :
~ ' ' `' ~ '
The present invention relates to a shock absorber adapted to provide predetermined shock absorbing characteristics, even when the piston ls operated at short intervals.
The present invention will be lllustrated by reference to the accompanying drawings, in which:-Fig. 1 is a sectional view illustratlny a prior art shock absorber, in which reference numeral 1 designates a casing lU containing oil, reference numeral 2 designates a cylinder formed in the casing 1, reference numeral 3 designates a piston which reciprocates within the cylinder 2, referencP numeral 4 desig-nates a small orifice having a predetermined diameter formed in the piston 3, reference numeral 5 designates a spring causing the piston 3 to return, reference numeral 6 designates hydraulic oil, reference numeral 7 designates a cover, reference numerals 8 and 9 designate seal members, reference numeral 10 designates a high pressure chamber in which a high pressure is produced by the pis-ton 3 during operation, reference numeral 11 designates a low pressure chamber and reference numeral 12 designates an air layer.
Next, the operation of the prior art shock absorber will be described. Referring to Fig. 1, when the piston 3 is pushed by an external force toward the left in Fig. 1, the pres-sure of the hydraulic oil rises within the high pressure chamber 10 and a shock absorbing force is generated against the externalforce. Then, the oil 6 within the high pressure chamber 10 is forced to flow out at a high flow speed into the low pressure chamber 11 through the small orifice ~ and the oil 6 within the low pressure chamber 11 is churned up and mixed wlth air within the air layer I2. The oil is subsequently stabilized as shown in Fig. 2. When the external force is removed, the piston 3 is moved by the spring 5 toward the right in Fig. 1. The oil 6 `: within thé low pressure chamber }1 is forced to flow into the high~pressure chamber 10 through the small oriflce 4. If the SY
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~ ~ . - . . ' . --- . .
~% 7 ~
piston 3 is returned within a short tlme after the shock absorb-ing operation, the air mixed in with the oll 6 flows into the high pressure chamber 10.
Therefore, the prior art shock absorber has problems in that regular shock absorbing char~ckeristics cannot be obtained during short interval operatlon because of the air mixing in with the oil 6.
The present invention has been made to eliminate the aforesaid problems and provides a shock absorber adapted to pro-vide regular shock absorbing characteristics.
According to the present invention there is provided a shock a~sorber comprising a piston disposed in a cyli~der con-taining liquid, the piston having a common axis with said cylin-der and dividing the cylinder into a high pressure chamber and alow pressure chamber, the low pressure chamber having an air layer with a free interface between said air layer and said liq-uid, said interface lying generally parallel to the axis of said cylinder, said piston comprising an orifice connecting at a first end with the high pressure chamber and connecting at a second end with the low pressure chamber and with an axis at said second end normal to said interface so that the liquid is forced to flow from the high pressure chamber into the low pressure chamber ~5 through the orifice with the piston is moved toward the high pressure chamber, the shock absorber ~urther comprising a shield-in~ member dlsposed within the low pressure chamber, said shield-ing member fixed in set apart relation to sald second end and lying between said second end and said interface, said member comprising a solid surface normal to the axis of said second end and spaced apart from said second end so as to oppase the flow arPa of the orifice, thereby reducing the speed o~ liquid flow fram the second end of the oriflce. Suitably said plston has a cylindrical portion extending into the low pressure chamber and said shielding member is toroidal ln form and coaxial with said . . :
: .~. . .
, - ~
: . . . . :, ~7~
cylindrical extension.
The shock absorber according to the prPsenk invention thus includes a shielding member disposed between the orifice formed in the piston and the air layer ~ormed in the low pressure chamber.
The shock absorber according to the present invention is adapted such that the oil flowing out at high speed through the orifice is reduced in flow speed by means of the shielding member during the operation of the piston, thereby preventlng the oil ~rom mixing with the air in the air layer within the low pressure chamber.
- The present invention will be further illustrated by way of the accompanying drawings, in which:-Fig. 1 is a sectional view of the prior art shockabsorber with the piston outward of the cylinder;
Fig. 2 is a s~milar sectional view of the shock absorber of Fig. 1 with the piston in an inwardly of the cylin-der; and Fig. 3 is a sectional view of the shock absorber of one embodiment according to the present invention.
In the Figùres, the same reference denote the same and corresponding parts.
The present invention will be readily clear from the following description in which the preferred embodiment has baen set forth in detail in con~unction with Fig. 3, wherein reference numeral 13 designates a shielding member disposed between the orifice 4 formed~ln the piston 3 and the air layer 12, the other-parts l and 12 being the same as those set forth ln regard to the . ~ . .
.
.
., " ". ~ ~ ' . '. ' - . : . , . :.
.
.
~ ~ 7 prior art shock absorber.
In the shock absorber constructed as stated above, the flow speed of the oil 6 flowiny out of the high pressure chamber 11 at high speed through the orifice ~, is reduced b~ striking against the shielding member 13, when the piston is operated, so that the oil 6 flows into the low pressure chamber 11 at low speed through a gap formed between the piston 3 and khe shielding member 13. Therefore, the oil 6 within the low pressure chamber 11 is not churned up and mixed with the air in the air layer 12, even when the plston is returned within a short tlme after the operation, thereby preventing the air from flowing into the high pressure chamber 10.
` Thus, accordlng to the present invention, a shielding member is provided which reduces the flow speed of the oil flow-ing into the law pressure chamber through the orifice due to the movement of the piston, thereby resulting in stable performance even when the piston is operated at short intervals.
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. . . ' . ' ' , ' .' ~. `' " " - ' ::: ., ` ~ . :
~ ' ' `' ~ '
Claims (2)
1. A shock absorber comprising a piston disposed in a cylinder containing liquid, the piston having a common axis with said cylinder and dividing the cylinder into a high pressure chamber and a low pressure chamber, the low pressure chamber having an air layer with a free interface between said air layer and said liquid, said interface lying generally parallel to the axis of said cylinder, said piston comprising an orifice connecting at a first end with the high pressure chamber and connecting at a second end with the low pressure chamber and with an axis at said second end normal to said interface so that the liquid is forced to flow from the high pressure chamber into the low pressure chamber through the orifice with the piston is moved toward the high pressure chamber, the shock absorber further comprising a shielding member disposed within the low pressure chamber, said shielding member fixed in set apart relation to said second end and lying between said second end and said interface, said member comprising a solid surface normal to the axis of said second end and spaced apart from said second end so as to oppose the flow area of the orifice, thereby reducing the speed of liquid flow from the second end of the orifice.
2. A shock absorber according to claim 1, in which said piston has a cylindrical portion extending into the low pressure chamber and said shielding member is toroidal in form and coaxial with said cylindrical extension.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8700085U JPS61202734U (en) | 1985-06-10 | 1985-06-10 | |
| JP87000/1985 | 1985-06-10 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1276190C true CA1276190C (en) | 1990-11-13 |
Family
ID=13902603
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000511173A Expired - Fee Related CA1276190C (en) | 1985-06-10 | 1986-06-09 | Shock absorbers |
Country Status (5)
| Country | Link |
|---|---|
| JP (1) | JPS61202734U (en) |
| CN (1) | CN86102419B (en) |
| AU (1) | AU573092B2 (en) |
| CA (1) | CA1276190C (en) |
| IN (1) | IN167408B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009101045A1 (en) * | 2008-02-13 | 2009-08-20 | Siemens Aktiengesellschaft | Damper arrangement |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102943837B (en) * | 2012-12-03 | 2014-07-02 | 天津市联大通讯发展有限公司 | Mechanical passive automatic stabilizer |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2111967C3 (en) * | 1971-03-12 | 1974-11-28 | Peddinghaus Carl Ullrich Dr | Hydropneumatic vibration damper |
| NL169633C (en) * | 1977-12-22 | 1982-08-02 | Itt | Adjusting device for the damping force of a shock absorber. |
-
1985
- 1985-06-10 JP JP8700085U patent/JPS61202734U/ja active Pending
-
1986
- 1986-04-09 CN CN86102419A patent/CN86102419B/en not_active Expired
- 1986-06-02 IN IN431/MAS/86A patent/IN167408B/en unknown
- 1986-06-05 AU AU58400/86A patent/AU573092B2/en not_active Ceased
- 1986-06-09 CA CA000511173A patent/CA1276190C/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009101045A1 (en) * | 2008-02-13 | 2009-08-20 | Siemens Aktiengesellschaft | Damper arrangement |
Also Published As
| Publication number | Publication date |
|---|---|
| IN167408B (en) | 1990-10-20 |
| AU5840086A (en) | 1986-12-18 |
| CN86102419A (en) | 1987-02-25 |
| JPS61202734U (en) | 1986-12-19 |
| CN86102419B (en) | 1988-12-07 |
| AU573092B2 (en) | 1988-05-26 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKLA | Lapsed |