CN1079507C - Multi-stage stroke cylinder - Google Patents
Multi-stage stroke cylinder Download PDFInfo
- Publication number
- CN1079507C CN1079507C CN97115947A CN97115947A CN1079507C CN 1079507 C CN1079507 C CN 1079507C CN 97115947 A CN97115947 A CN 97115947A CN 97115947 A CN97115947 A CN 97115947A CN 1079507 C CN1079507 C CN 1079507C
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- China
- Prior art keywords
- piston
- stop surface
- sleeve
- cylinder
- inlet side
- 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
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- Y02T10/121—
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- Actuator (AREA)
Abstract
The present invention relates to a multi-stage stroke cylinder which can reduce the surface pressure when returning and retreating to the original position, so the multi-stage stroke cylinder has fast response and simultaneously can be miniaturized. A sleeve barrel can be freely and glidingly embedded in a cylinder. A second piston is arranged in the sleeve barrel and is provided with a spring for pressing the second piston always. One end of a drive shaft is connected with the second piston. A first through opening and a second through opening are arranged on the cylinder, and are used for supplying or exhausting pressure. A first stop surface and a second stop surface are arranged in the cylinder. The sleeve barrel is provided with a forward end stop surface and a backward end stop surface. A flange part is arranged on the second piston.
Description
The present invention relates to a kind of hydrodynamic pressure cylinder that can obtain multi-stage stroke.
In diesel engine, be classified to control the opening degree of suction throttling valve, load according to motor carries out the air supply, so that motor turns round in the best condition, to realize the fuel saving expense, to reduce noise, in this case, it is suitable utilizing the cylinder of high-pressure air as the actuator use of controlling suction throttling valve, existing common multistage air cylinder structure complexity, the length of cylinder axis is longer, is difficult to install in the cabin of limited space system.In addition, though can use a plurality of little cylinders and control the opening degree of multistage valve by linkage mechanism, this neither compact structure, can cause the raising of cost.
Real opening in flat 3-219103 number provides the multi-stage stroke that addresses this problem in Japan.
This prior art constructions of explanation in Fig. 2.The 1st, cylinder, the 2nd, closely be inlaid in the end cap of described cylinder 1 opening end.End in described cylinder 1 forms the first retainer 1a by the step with the perpendicular vertical surface of cylinder-bore axis.
The 3rd, axial direction can be free to slide the intercalation scope that cylinder 1 in, also will contact in ground with the first retainer 1a as the sleeve of stroke.In an end of described sleeve 3, be set with first piston 4 with the described first retainer 1a opposition side, be provided with the second retainer 3a that contacts with second piston 5 described later at the other end.Towards sleeve 3 the other ends, be provided with the jut 4a of Len req at the center of described first piston 4 highlightedly.
And, in sleeve 3, when the jut 4a of described second piston 5 and first piston 4 contacts, between second piston 5 and first piston 4, form opposed gap 9, from this position to stroke that the second retainer 3a contacts in, second piston 5 can be free to slide the ground intercalation in described sleeve 3.Described second piston 5 is applied active force towards the direction that contacts with the jut 4a of first piston 4 all the time by spring 6.The end and described second piston 5 that reach the transmission shaft 7 outside the cylinder 1 link.
On described cylinder 1, be provided with first port 8 and second port 11, first port 8 is through being opened in the opposed gap 9 of through hole 10 between first piston 4 and second piston 5 on the sleeve 3 and supplying with or discharge air pressure thus, and second port 11 between first piston 4 and end cap 2 gap 12 supplies or discharge air pressure thus.In addition, 13 expression air are extracted mouth out.
In the operation of said structure, under the state, first port 8 all contacts with jut 4a with second port 11 in situ, and pressure is passed on the first piston 4 thus, and sleeve 3 is positioned at the left end of Fig. 2 by described pressure.
Under this state, when supplying with air pressure, just push first piston 4 left, and push second piston 5 to the right from the opposed gap 9 of first port 8 between the first piston 4 and second piston 5.Like this, sleeve 3 remains on the original position state, and second piston, 5 pressure springs 6 move right to contacting with the second retainer 3a that is formed on sleeve 3 the other ends.Described second piston, 5 independent strokes are first order stroke S
1
Then, supply with air pressure from 11 gaps 12 between first piston 4 and end cap 2 of second port, then second piston 5 is in the jut 4a state of contact with first piston 4, sleeve 3 move right to be arranged on cylinder 1 on the first retainer 1a contact, the stroke that described sleeve 3 moves right is than described first order stroke S
1Big second level stroke S
2
And, under this state, supply with air pressure from first port 8, at described second level stroke S
2The basis on add the first order stroke S of second piston 5
1, just can obtain the 3rd level stroke S of maximum stroke
3
In above-mentioned prior art constructions, when sleeve 3 and second piston 5 from 3rd level stroke S by the full stroke that air obtained
3Preceding inlet side, when returning the original position that retreats end because of the effect of spring 6, the transmission shaft 7 that stretches out from second piston 5 contacts with the jut 4a of first piston 4, promotes first piston 4 and sleeve 3.Therefore, the surface pressure that acts on the jut 4a of first piston 4 is very big, bad response, and returning in the action that retreats original position in the early stage has difficulties.In addition, because the restriction in ground connection space etc., cylinder barrel will be done lessly, has therefore small-sizedly changed into problem to be solved.
The purpose of this invention is to provide a kind of multi-stage stroke cylinder that surface pressure when retreating original position, response are fast, can realize miniaturization that reduces to return.
To achieve these goals, multi-stage stroke cylinder of the present invention comprises: can be free to slide the sleeve of ground intercalation in cylinder along axial direction in certain stroke; Be fixed on the first piston of an end in the described sleeve; Second piston has with described first piston opposedly to contact with gap, and in sleeve, to slide to the fixedly stroke range of the preceding inlet side stop surface that is arranged at the sleeve the other end from described contact position; All the time towards the direction that described second piston is contacted with described first piston described second piston is applied the spring of active force, and, the end and described second piston that reach the outer transmission shaft of cylinder link, be provided with on the described cylinder to supply pressure between the opposed faces of the first piston and second piston or thus head pressure first port and between first piston and cylinder interior edge face supply pressure or second port of head pressure thus, and, in described cylinder, first stop surface that retreats end that is provided with the described sleeve of restriction is with relative with described first stop surface and limit second stop surface of preceding inlet side; On described sleeve, be formed with preceding inlet side stop surface with the described the other end relative retreat the end stop surface; On described second piston, be provided with described preceding inlet side stop surface and retreat and hold the contacted lip part of stop surface.
Brief description of drawings:
Fig. 1 is a sectional view of the present invention;
Fig. 2 is the sectional view of prior art.
Below in conjunction with the description of drawings embodiments of the invention.In Fig. 1,20a is first shell, and 20b is and joining second shell of described first shell, forms cylinder by the described first shell 20a, the second shell 20b.
Sleeve 3 can be free to slide the ground intercalation in the described first shell 20a at axial direction, and is applied in active force towards the direction of retreat of the first shell 20a, one end all the time by spring 6b.By spring ring 23 first piston 4 is fixedly installed in the end of sleeve 3.Be provided with the jut 4a of Len req highlightedly facing to sleeve 3 the other ends at the center of described first piston 4.
And second piston 5 can be free to slide the ground intercalation in described sleeve 3.An end that reaches the outer transmission shaft 7 (being the valve rod of exhaust gas recirculatioon (EGR) in the embodiment in figure 1) of the second shell 20b is connected on second piston 5.By spring 6a, the direction towards first piston 4 applies active force to described second piston 5 all the time, and an end of described transmission shaft 7 contacts with the jut of first piston 4, forms opposed gap 9 between second piston 5 and first piston 4.
The described first shell 20a is provided with first port 8 and second port 11, first port 8 is through being opened in the opposed gap 9 of through hole 10 between first piston 4 and second piston 5 on the sleeve 3 and supplying with or exhausting air from then on, and gap 12 supplies or the from then on exhausting air of second port 11 between the first piston 4 and the first shell 20a end face.In addition, the 13rd, the air that is opened on the second shell 20b is extracted mouth out.
In the described first shell 20a, be provided with the first stop surface 21a that retreats end of the described sleeve 3 of restriction, and in the second shell 20b, be provided with the second stop surface 21b preceding inlet side, relative with the first stop surface 21a of restriction sleeve 3.The first stop surface 21a and the second stop surface 21b depend on the step shape with the vertical surface of the axis normal of the first shell 20a and the second shell 20b.
In addition, on described sleeve 3, be provided with restriction second piston 5 retreat end retreat end stop surface 22a with mutually opposed and limit the preceding inlet side stop surface 22b of preceding inlet side with the described end stop surface 22a that retreats, described second piston 5 is provided with and describedly retreats the lip part 5a that end stop surface 22a contacts with preceding inlet side stop surface 22b.Described end stop surface 22a and the preceding inlet side stop surface 22b of retreating also depends on step shape with the vertical surface of the axis normal of the first shell 20a and sleeve 3.
The following describes operation of the present invention.The original position state is the state of sleeve 3 upper end (retreating end) that is arranged in Fig. 1, under this state, first port 8 and second port 11 are not supplied air, as shown in Figure 1, spring 6a by spring 6b and pressure second piston 5, the lip part 5a of second piston 5 contacts with retreating end stop surface 22a, and transmission shaft 7 also contacts with the jut 4a of first piston 4.
Under this state, in case from opposed gap 9 air supplies of first port 8 between the first piston 4 and second piston 5, just to pressing down second piston 5.Like this, sleeve 3 remains on original position state (retreating end), second piston, 5 pressure spring 6a, and move forward to be formed at sleeve 3 on preceding inlet side stop surface 22b contact.Described second piston, 5 independent strokes are phase I stroke S
1
Then, when supplying air from 11 gaps 12 between first piston 4 and first shell, 20 end faces of second port, with the jut 4a state of contact of second piston 5 with first piston 4, sleeve 3 moves down (moving forward), up to be located at the second shell 20b on the second stop surface 21b contact.(moving forward) stroke that moves down of sleeve 3 is than described first order stroke S
1Big second level stroke S
2
Then, under this state, when when first port 8 is supplied with air pressure, second piston 5 move forward up to be formed at sleeve 3 on preceding inlet side stop surface 22b contact, like this at described second level stroke S
2The basis on add first order stroke S
1, just can obtain the 3rd level stroke S of maximum stroke
3
Owing to discharged the air of supplying with gap 9,12, thereby from the 3rd level stroke S of described maximum stroke
3Preceding inlet side state, by spring 6a, the elastic force of 6b makes the sleeve 3 and second piston 5 turn back to the original position that retreats end, at this moment, the lip part 5a of second piston 5 contact with the end stop surface 22a that retreats on being formed at sleeve 3, and while transmission shaft 7 also contacts with the jut 4a of first piston 4, owing to promote at this two places contacting part and the first piston 4 all-in-one-piece sleeves 3 and second piston 5, reduce surface pressure, and promptly moved backward, therefore can obtain responsiveness fast.
And, as second piston 5 being limited in the chocking construction that retreats the end and the stroke end of preceding inlet side, on sleeve 3, form restriction retreat end retreat end stop surface 22a and with the described preceding inlet side stop surface 22b that holds the preceding inlet side of the opposed restriction of stop surface 22a that retreats.Because second piston 5 is provided with and the described lip part 5a that holds stop surface 22a to contact with preceding inlet side stop surface 22b that retreats, therefore, as the first shell 20a of air compression face is that the diameter of cylinder-bore, sleeve 3, first piston 4 and second piston 5 can be minor diameter, makes miniaturization become possibility.
According to aforesaid the present invention, can obtain 3 grades of different strokes by the length of short cylinder axis and the cylinder-bore of minor diameter, make miniaturization become possibility, in returning the process that retreats the end original position, reduced the surface pressure that promotes backward, can obtain responsiveness fast, only effect be arranged as the actuator of suction throttling valve, row pneumatic valve, exhaust gas re-circulation apparatus etc. or the control lathe of control motor.
Claims (1)
1. a multi-stage stroke cylinder comprises: can be free to slide the sleeve of ground intercalation in cylinder along axial direction in certain stroke; Be fixed on the first piston of an end in the described sleeve; Second piston has with described first piston opposedly to contact with gap, and in sleeve, to slide to the fixedly stroke range of the preceding inlet side stop surface that is arranged at the sleeve the other end from described contact position; All the time towards the direction that described second piston is contacted with described first piston described second piston is applied the spring of active force, and, the end and described second piston that reach the outer transmission shaft of cylinder link, be provided with on the described cylinder to supply pressure between the opposed faces of the first piston and second piston or thus head pressure first port and between first piston and cylinder interior edge face supply pressure or second port of head pressure thus, it is characterized in that, in described cylinder, first stop surface that retreats end that is provided with the described sleeve of restriction is with relative with described first stop surface and limit second stop surface of preceding inlet side; On described sleeve, be formed with preceding inlet side stop surface with the described the other end relative retreat the end stop surface; On described second piston, be provided with described preceding inlet side stop surface and retreat and hold the contacted lip part of stop surface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN97115947A CN1079507C (en) | 1997-06-20 | 1997-06-20 | Multi-stage stroke cylinder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN97115947A CN1079507C (en) | 1997-06-20 | 1997-06-20 | Multi-stage stroke cylinder |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1203321A CN1203321A (en) | 1998-12-30 |
| CN1079507C true CN1079507C (en) | 2002-02-20 |
Family
ID=5173573
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN97115947A Expired - Fee Related CN1079507C (en) | 1997-06-20 | 1997-06-20 | Multi-stage stroke cylinder |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1079507C (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1289796C (en) * | 2003-10-13 | 2006-12-13 | 方戟 | Hydraulic distributing mechanism for engine rotary valve |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08270609A (en) * | 1995-03-31 | 1996-10-15 | Sanwa Seiki Co Ltd | Operating method of actuator capable of multistep positioning |
| JPH08270613A (en) * | 1995-03-31 | 1996-10-15 | Sanwa Seiki Co Ltd | Actuator capable of multistep positioning |
| JPH0979416A (en) * | 1995-09-19 | 1997-03-25 | Mitsubishi Motors Corp | Multiple stage open stroke valve device |
-
1997
- 1997-06-20 CN CN97115947A patent/CN1079507C/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08270609A (en) * | 1995-03-31 | 1996-10-15 | Sanwa Seiki Co Ltd | Operating method of actuator capable of multistep positioning |
| JPH08270613A (en) * | 1995-03-31 | 1996-10-15 | Sanwa Seiki Co Ltd | Actuator capable of multistep positioning |
| JPH0979416A (en) * | 1995-09-19 | 1997-03-25 | Mitsubishi Motors Corp | Multiple stage open stroke valve device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1203321A (en) | 1998-12-30 |
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|---|---|---|---|
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C06 | Publication | ||
| PB01 | Publication | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20020220 |