CA2557756A1 - Hydraulic cylinder - Google Patents
Hydraulic cylinder Download PDFInfo
- Publication number
- CA2557756A1 CA2557756A1 CA 2557756 CA2557756A CA2557756A1 CA 2557756 A1 CA2557756 A1 CA 2557756A1 CA 2557756 CA2557756 CA 2557756 CA 2557756 A CA2557756 A CA 2557756A CA 2557756 A1 CA2557756 A1 CA 2557756A1
- Authority
- CA
- Canada
- Prior art keywords
- end cup
- tube
- hydraulic cylinder
- piston
- head gland
- 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.)
- Abandoned
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/20—Other details, e.g. assembly with regulating devices
- F15B15/22—Other details, e.g. assembly with regulating devices for accelerating or decelerating the stroke
- F15B15/222—Other details, e.g. assembly with regulating devices for accelerating or decelerating the stroke having a piston with a piston extension or piston recess which throttles the main fluid outlet as the piston approaches its end position
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Actuator (AREA)
Abstract
A hydraulic cylinder comprises a piston, which is movable inside a tube between an end cup and a head gland in the direction of the cylinder axis. The head gland is provided with an opening for a piston rod, and a clevis is attached to the end cup. Each tube end is provided with the internal screw thread, which is adapted for cooperation with the external screw thread at each of the end cup and the head gland. A
spacer can be added to rearrange the rotational position of the clevis with respect to the oil ports. The end cup can be provided with an optional cushion unit, and metering passages can be built in this end cup.
spacer can be added to rearrange the rotational position of the clevis with respect to the oil ports. The end cup can be provided with an optional cushion unit, and metering passages can be built in this end cup.
Description
Pagelof 5 DETAILED DESCRIPTION OF THE INVENTION
This invention relates to a hydraulic cylinder with a special end cup. A
welded cylinder or a tie rod cylinder is very common in the industrial application. When a welded hydraulic cylinder is applied in the engineering, the following disadvantages must be considered, such as extra welding process, thermal deformation of the tube, and the cushion unit being difficult to be made etc. In the same time, there is a lot of limitation when a tie rod cylinder is used as a component of machines, such as taking more space and too heavy.
When designed a welded hydraulic cylinder, I found the welded end cup can be replaced by a standard end cup with the external thread. Although there are many kinds of modification on the welded end cup, more parts will be needed to replace this welded end cup and the manufacturing process will be more complicated.
In this invention of this hydraulic cylinder, only one end cup with a clevis is needed to replace a traditional welded end cup, and can be designed as a standard part to facilitate the manufacture of the hydraulic cylinder. For this kind of hydraulic cylinder, a cushion unit including cushion passages can be comprised in the end cup just like the tie rod cylinder. Inlet or outlet ports are located at the tube, and the tube can be designed as a standard part according to strokes, piston size, tube thickness. This cylinder can be also designed as a heavy duty hydraulic cylinder and applied in the different working condition.
This end cup is connected with the tube via screw joints, and the clevis is attached to the end cup, so the orientation of the inlet/outlet ports which attach the tube of the cylinder can be adjusted with respect to the clevis only adding spacers between the end cup and tube. Therefore, limitations on the mounting position of the cylinder can be avoided in the future service.
In drawings which illustrate embodiments of the invention, FIG.1 shows a longitudinal section through a cylinder according to the invention; FIG.2 is top view of this cylinder; FIG.3 is sectional view of I and II in somewhat enlarged scale, which are from FIG.1 and FIG.2; FIG.4 is a detailed drawing of the end cup according to the invention; FIG.5 is detail drawing of the adjustable spool from the cushion unit; FIG.6 is a detailed drawing of Page 2 of 5 the lock nut from the cushion unit.
The hydraulic cylinder shown in the FIG.1 comprises a cylindrical tube 4 with a head gland 2 and an end cup 9.
The head gland 2 is provided with an opening for a piston rod 1 which is connected to a piston 11, which has a free linear movement between the head gland 2 and the end cup 9 inside the tube 4.
Shown in FIG. 1, the diameter of the bore in the head gland 2 is larger than the diameter of the piston rod 1. The end cup 9 and the head gland 2 are connected to the tube 4 via screw joints, each tube end is provided with internal screw thread, which is adapted for cooperation with external screw thread at each of the end cup 9 and the head gland 2. The end cup 9 may be provided with optional cushion passages and a clevis J, which is shown in FIG.4.
The head gland 2 and the end cup 9 are provided with grooves for 0-ring and backup ring 3, 8 to prevent from leaking. The head gland 2 also is provided with shaft seals 13, and the piston 11 is provided with piston seals 6 and 0-ring 5. The piston 11 is locked on the rod I by a set screw 7. There are two ports B, C, which are to be connected with hydraulic fittings.
When this cylinder is assembled, in the first the end cup 9 and the tube 4 have to be preassembled in locking engagement. Then the desired position of ports B, C will be located. Drilling and taping the two ports (B, C) can be accomplished only after disassemble the component (comprising the end cup 9 and the tube 4). In this case, no spacer is needed.
When the different orientation of the end cup No.9 with respect to the oil ports (B, C )is required in the future service, the spacer 10 will be needed on this condition. After the spacer 10 is assembled with the end cup 9 and the tube 4 in locking engagement, the end cup 9 will be rearranged on the tube 4 in some desired rotational position about the cylinder axis with respect to the clevis J and the oil ports B, C. The thickness of the spacer 10 can be calculated according to the pitch of the thread on the end cup 9 and the rotating angle required.
Page 3 of 5 Shown in FIG.3 and FIG.4, a cusllion unit may be provided with metering passages F, G in the end cup 9 of the cylinder through which exhausted fluid is expelled. As the piston l l with the plunger A (shown in F1G.1) extends toward the bore H in the end cup 9, the flow of exhausted fluid will be restricted. Adjustment of inetering exhausted fluid through H will be acconiplished by turning an adjustable spool 19 shown in FIG.5, which is locked by a lock nut 17 shown in FIG.6. The second series of passages( D, E) comprising a check valve unit( a ball 15, and a spring 16), keep the flow of fluid in one direction. This cushion adjustment unit A, D, E, F, G, H, and item 14-19 (shown in FIG.I-5) may be eliminated, and this cylinder becomes a threaded end cup cylinder without cushion.
The invention is not limited to the above described embodiment, but several variants are conceivable within the scope of the accompanying claims. For example, the style of the clevis J may be different.
This invention relates to a hydraulic cylinder with a special end cup. A
welded cylinder or a tie rod cylinder is very common in the industrial application. When a welded hydraulic cylinder is applied in the engineering, the following disadvantages must be considered, such as extra welding process, thermal deformation of the tube, and the cushion unit being difficult to be made etc. In the same time, there is a lot of limitation when a tie rod cylinder is used as a component of machines, such as taking more space and too heavy.
When designed a welded hydraulic cylinder, I found the welded end cup can be replaced by a standard end cup with the external thread. Although there are many kinds of modification on the welded end cup, more parts will be needed to replace this welded end cup and the manufacturing process will be more complicated.
In this invention of this hydraulic cylinder, only one end cup with a clevis is needed to replace a traditional welded end cup, and can be designed as a standard part to facilitate the manufacture of the hydraulic cylinder. For this kind of hydraulic cylinder, a cushion unit including cushion passages can be comprised in the end cup just like the tie rod cylinder. Inlet or outlet ports are located at the tube, and the tube can be designed as a standard part according to strokes, piston size, tube thickness. This cylinder can be also designed as a heavy duty hydraulic cylinder and applied in the different working condition.
This end cup is connected with the tube via screw joints, and the clevis is attached to the end cup, so the orientation of the inlet/outlet ports which attach the tube of the cylinder can be adjusted with respect to the clevis only adding spacers between the end cup and tube. Therefore, limitations on the mounting position of the cylinder can be avoided in the future service.
In drawings which illustrate embodiments of the invention, FIG.1 shows a longitudinal section through a cylinder according to the invention; FIG.2 is top view of this cylinder; FIG.3 is sectional view of I and II in somewhat enlarged scale, which are from FIG.1 and FIG.2; FIG.4 is a detailed drawing of the end cup according to the invention; FIG.5 is detail drawing of the adjustable spool from the cushion unit; FIG.6 is a detailed drawing of Page 2 of 5 the lock nut from the cushion unit.
The hydraulic cylinder shown in the FIG.1 comprises a cylindrical tube 4 with a head gland 2 and an end cup 9.
The head gland 2 is provided with an opening for a piston rod 1 which is connected to a piston 11, which has a free linear movement between the head gland 2 and the end cup 9 inside the tube 4.
Shown in FIG. 1, the diameter of the bore in the head gland 2 is larger than the diameter of the piston rod 1. The end cup 9 and the head gland 2 are connected to the tube 4 via screw joints, each tube end is provided with internal screw thread, which is adapted for cooperation with external screw thread at each of the end cup 9 and the head gland 2. The end cup 9 may be provided with optional cushion passages and a clevis J, which is shown in FIG.4.
The head gland 2 and the end cup 9 are provided with grooves for 0-ring and backup ring 3, 8 to prevent from leaking. The head gland 2 also is provided with shaft seals 13, and the piston 11 is provided with piston seals 6 and 0-ring 5. The piston 11 is locked on the rod I by a set screw 7. There are two ports B, C, which are to be connected with hydraulic fittings.
When this cylinder is assembled, in the first the end cup 9 and the tube 4 have to be preassembled in locking engagement. Then the desired position of ports B, C will be located. Drilling and taping the two ports (B, C) can be accomplished only after disassemble the component (comprising the end cup 9 and the tube 4). In this case, no spacer is needed.
When the different orientation of the end cup No.9 with respect to the oil ports (B, C )is required in the future service, the spacer 10 will be needed on this condition. After the spacer 10 is assembled with the end cup 9 and the tube 4 in locking engagement, the end cup 9 will be rearranged on the tube 4 in some desired rotational position about the cylinder axis with respect to the clevis J and the oil ports B, C. The thickness of the spacer 10 can be calculated according to the pitch of the thread on the end cup 9 and the rotating angle required.
Page 3 of 5 Shown in FIG.3 and FIG.4, a cusllion unit may be provided with metering passages F, G in the end cup 9 of the cylinder through which exhausted fluid is expelled. As the piston l l with the plunger A (shown in F1G.1) extends toward the bore H in the end cup 9, the flow of exhausted fluid will be restricted. Adjustment of inetering exhausted fluid through H will be acconiplished by turning an adjustable spool 19 shown in FIG.5, which is locked by a lock nut 17 shown in FIG.6. The second series of passages( D, E) comprising a check valve unit( a ball 15, and a spring 16), keep the flow of fluid in one direction. This cushion adjustment unit A, D, E, F, G, H, and item 14-19 (shown in FIG.I-5) may be eliminated, and this cylinder becomes a threaded end cup cylinder without cushion.
The invention is not limited to the above described embodiment, but several variants are conceivable within the scope of the accompanying claims. For example, the style of the clevis J may be different.
Claims (12)
1.The hydraulic cylinder shown in the FIG.1 and FIG.2 comprises a cylindrical tube 4 with a head gland 2 and an end cup 9. The head gland 2 is provided with an opening for a piston rod 1 which is connected to a piston 11, and the piston 11 has a free linear movement inside the tube 4 between the head gland 2 and the end cup 9. The diameter of the bore in the head gland 2 is larger than the diameter of the piston rod 1. The head gland 2 and the end cup 9 are connected to the tube 4 via screw joints, each tube end is provided with the internal screw thread, which is adapted for cooperation with the external screw thread at each of the head gland 2 and the end cup 9.
2. The hydraulic cylinder of Claim 1, wherein the said head gland 2 and the end cup 9 shown in FIG.1 are provided with groove for O-ring and backup ring 3, 8 to prevent from leaking, and the head gland 2 also is provided with shaft seals 13. The piston 11 locked on rod 1 by set screw 7, is provided with piston seals 6 and O-ring 5.
3. The hydraulic cylinder of Claim 1, wherein the said tube 4 is designed with two ports B, C shown in FIG.1, which are to be connected with hydraulic fittings.
4. The hydraulic cylinder of Claim 1, wherein the piston rod 1 is provided with a plunger A as shown in FIG.1, which diameter is smaller than that of the bore H shown in FIG.4.
5. The hydraulic cylinder of Claim 1, wherein the said end cup 9 shown in FIG.4 may be provided with optional cushion passages D, E, F, G, H.
6.The hydraulic cylinder of Claim 1, wherein the said end cup 9 can be provided with a cushion unit comprising an adjustable spool 19, O-ring (with backup ring) 18, a lock nut 17, and passages F, G, which are shown in FIG.3-FIG.6. Shown in FIG.4, a check valve unit which includes a NPT plug14, a ball 15, a spring 16, and passages D, E, is also comprised in the said end cup 9.
7.The hydraulic cylinder of Claim 6, wherein the said adjustable spool 19 is locked by lock nut 17.As the piston 11 with plunger A extends toward the bore H in the end cup 9, the flow of exhausted fluid will be restricted through the passages F, G. The metering adjustment of exhausted fluid through the passage F also can be accomplished by turning the adjustable spool 19.
8. The hydraulic cylinder of Claim 6, wherein the said ball 15 and spring 16 are held by an NPT plug 14, which keep the flow of fluid in one direction. When piston 11 is extended and the plunger A is still moving inside the bore H, this check valve unit will be open.
9. The hydraulic cylinder of Claim 6, wherein the said cushion adjustment unit A, D, E, F, G, H and 14-19 may be eliminated, and it becomes a threaded end cup cylinder without cushion.
10.A method of manufacturing this cylinder of claim 1, the end cup 9 and the tube 4 will be preassembled in locking engagement. Then the desired position of ports B, C will be located.
Drilling and taping could be accomplished only after the component comprising the end cup 9 and the tube 4 has been disassembled. In this case, The spacer 10 will not be needed.
Drilling and taping could be accomplished only after the component comprising the end cup 9 and the tube 4 has been disassembled. In this case, The spacer 10 will not be needed.
11. The method of claim 10, wherein the said spacer 10 may be needed when different orientation of the end cup 9 with respect to the oil port B, C is required. The thickness of the spacer 10 can be calculated according to the pitch of the thread on the end cup 9 and the rotating angle required. After the said spacer 10 is located between the end cup 9 and the tube 4 in locking engagement, the end cup 9 will be rearranged on the tube 4 in some desired turning position about the cylinder axis with respect to the oil ports.
12. The hydraulic cylinder of Claim 1,wherein the invention is not limited to the above described embodiment, but several variants are conceivable within the scope of the accompanying claims. For example, the style of the clevis J of the said cylinder may be different.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2557756 CA2557756A1 (en) | 2006-08-16 | 2006-08-16 | Hydraulic cylinder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2557756 CA2557756A1 (en) | 2006-08-16 | 2006-08-16 | Hydraulic cylinder |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2557756A1 true CA2557756A1 (en) | 2008-02-16 |
Family
ID=39091927
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2557756 Abandoned CA2557756A1 (en) | 2006-08-16 | 2006-08-16 | Hydraulic cylinder |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2557756A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101982301A (en) * | 2010-08-30 | 2011-03-02 | 兰州瑞德实业集团有限公司 | Compact sensitive cylinder |
-
2006
- 2006-08-16 CA CA 2557756 patent/CA2557756A1/en not_active Abandoned
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101982301A (en) * | 2010-08-30 | 2011-03-02 | 兰州瑞德实业集团有限公司 | Compact sensitive cylinder |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Dead |