CN1053954C - Piston rod type fluid driving cylinder - Google Patents
Piston rod type fluid driving cylinder Download PDFInfo
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- CN1053954C CN1053954C CN94105701A CN94105701A CN1053954C CN 1053954 C CN1053954 C CN 1053954C CN 94105701 A CN94105701 A CN 94105701A CN 94105701 A CN94105701 A CN 94105701A CN 1053954 C CN1053954 C CN 1053954C
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- cylinder
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- 239000012530 fluid Substances 0.000 title claims abstract description 51
- 239000007788 liquid Substances 0.000 claims abstract description 3
- 238000005096 rolling process Methods 0.000 claims description 7
- 238000007789 sealing Methods 0.000 claims description 5
- 230000008859 change Effects 0.000 claims description 3
- 230000033001 locomotion Effects 0.000 abstract description 21
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 238000012545 processing Methods 0.000 abstract description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 2
- 238000000034 method Methods 0.000 description 14
- 230000005540 biological transmission Effects 0.000 description 2
- 238000013016 damping Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
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Abstract
The "piston rod type fluid driving cylinder" is a fluid driving cylinder in which a piston rod is driven by pressure fluid (including oil, water, air, etc.) to reciprocate without rotating. The basic function of the hydraulic reciprocating engine is to convert the pressure energy of fluid into pure reciprocating mechanical energy, and the hydraulic reciprocating engine is an actuating element of a pneumatic or hydraulic system. The main structure is characterized in that the piston rod has a certain eccentricity with the cylinder hole and the inner hole on the cylinder cover, thereby simply and effectively realizing the requirement that the piston rod only does reciprocating motion but does not rotate. The invention has the advantages of simple structure, easy processing, small volume and low cost, and is particularly suitable for manufacturing a large-stroke liquid cylinder.
Description
The present invention is a kind of about utilizing the reciprocating fluid driven cylinder of pressurized fluid driven piston rod, and is particularly a kind of about the only reciprocating and invention of fluid driven cylinder that can not rotate of piston rod.
Fluid driven cylinder (comprising with oil, water or the air equal pressure fluid various to-and-fro motion cylinders as driven medium) is a kind of ancient and basic hydraulic element.Its main effect is that the pressure with fluid can convert to-and-fro motion mechanical energy to, produces straight reciprocating motion and Driving force.As the executive component of hydraulic pressure or pneumatic system, fluid driven cylinder is widely used in various industrial fields.
Along with industrial development, the people's convection cell cylinder especially requirement of the forms of motion of pneumatic piston bar and precision also further improves.In a lot of fields as production line for automatically assembling, material transmission production line, packing and printingindustry production line etc., not only require fluid driven cylinder that to-and-fro motion can be provided, and wish that its piston rod is in reciprocating, do not produce any rotatablely moving, with movement locus and the transmission of power that accurately repeats to set according to job requirement.
From preventing the method for fluid drives cylinder piston rod rotation, two classes are roughly arranged at present: a class is so-called external stability method, and a kind of is the internal fixation method.When adopting the external stability method, generally be to add the guide mechanism of forming by guide rod and contiguous block, realize the pure to-and-fro motion of piston rod or cylinder body.The shortcoming of this method is that installation volume is big, and part number is more, and the difficulty of processing of pilot hole is big etc.Another kind is to prevent that piston rod from producing the so-called internal fixation method of method of rotation when to-and-fro motion.In this method, several forms are arranged again: the one, offer spline, flat key or guide finger etc. in the inside of cylinder body and the suitable position of piston rod; Another kind of then be to adopt the cylinder hole of non-circular section and piston as taper shape, triangle, rectangle etc.In addition, also have a kind of parallel cylinder of two or more integrated types of employing and piston rod, and externally several piston rod is made the method for mechanical fixation.Though these methods can both reach the only reciprocating and requirement of not rotating of piston rod, but all exist or part number more, or the processed complex of part and finally cause problems such as cost is higher, installation volume is big, especially when making big stroke fluid driven cylinder, situation is all the more so.
At this situation, the object of the present invention is to provide a kind of process simple, cost is low, volume is little, in light weight, reliable operation, can realize the piston rod non-rotating fluid driven cylinder of the activity of large stroke reciprocating easily.
The intention of invention is realized by following method: in a columniform cylinder hole, install a columniform piston, the periphery of piston is provided with circular seal ring.The two ends of cylinder body are provided with cylinder cap, and the profile of cylinder cap can be cylindrical or other shape, but with cylinder body can not do relative axially and rotatablely move.At off-centered a certain position, piston and cylinder cap middle part, offer respectively one mutually with one heart but with the eccentric opening of cylinder hole decentraction.The periphery of piston rod links together by discussing eccentric opening and piston, between the two for being fastenedly connected, makes it to produce any relative movement.Eccentric opening place on cylinder cap is provided with a sliding bearing or ball type linear motion bearing, and the endoporus of piston rod and this bearing is a Spielpassung, can produce to-and-fro motion between the two.For preventing that fluid from leaking outside,, be provided with the seal ring that cooperates with piston rod surface at the suitable position of cylinder cap.
Because promptly there are not an off-centre in the axle center of piston rod and the axle center of cylinder hole and cylinder cap on a line, and piston rod and piston tighten together, cylinder cap can not rotate with respect to cylinder body in addition, so piston rod can only be reciprocating and can not rotate with respect to cylinder hole and cylinder cap, thereby it is not only simple but also realized the intention of invention reliably, its structural principle as shown in Figure 1, " K1 " among the figure, " K2 " is the fluid passage, pressure fluid will be sent to the both sides of piston, the to-and-fro motion to the left and right of driven plunger and piston rod in turn by this passage.
With collar cylinder cap is made the occasion of axial restraint in the employing hole, in order to guarantee that cylinder cap itself can not rotate with respect to the cylinder hole, adopted following method in the present invention: both sides in cylinder body master cylinder hole, it is bigger to have offered two diameters respectively, the eccentric side opening that cooperates with the cylinder cap periphery, the center of this off-centre side opening can not be concentric with the master cylinder hole, also can be not concentric with piston rod.That is to say, has an off-centre at the endoporus that makes cylinder cap and piston rod and center, cylinder hole in " E1 ", make between bigger two ends side opening of the periphery of cylinder cap and diameter and the master cylinder hole also to have an offset " E2 " (" E2 " can equal " E1 "), as shown in accompanying drawing 4--accompanying drawing 6.
In order to reduce the contact wear of to-and-fro motion face, having installed one between the outside of piston and cylinder hole surface can be around the antifriction bearing ring of own axle center rotation.
Being arranged on the bearing at cylinder cap place, both can be sliding bearing, also can be the ball type linear motion bearing, but the latter's price is more expensive.For solving the eccentric wear problem that piston rod produces sliding bearing and reducing cost, adopted following method in the present invention: between the eccentric opening and sliding bearing on the cylinder cap, installing one can be around the rolling bearing of own rotational, the periphery of sliding bearing is a drive fit with the inner ring of rolling bearing, and inner headed face then matches with piston rod surface.When fluid cylinder was worked, the intermittence of rolling bearing, rolling can constantly change the contact friction position between sliding bearing and the piston rod.
Because all fitting surfaces of fluid driven cylinder that the present invention discusses are the ring surface, so easy processing is simple in structure, reliable operation, with low cost.Again because of there not being any outside additional zero parts, so volume is very little and be adapted to make the fluid cylinder of big stroke especially as guide rod and so on.
Compare with existing various piston rod non-rotating fluid cylinders, the present invention has simple in structure, and processing cost is low, and volume is little, and reliable operation especially is adapted to make series of advantages such as big stroke fluid driven cylinder.
Description of drawings
Fig. 1 is eccentric double-piston rod-type fluid driven cylinder structural principle sketch.
Fig. 2 is eccentric single-piston rod formula fluid driven cylinder structure example.
Fig. 3 is the side view of " Fig. 2 ".
Fig. 4 is the single piston fluid driven cylinder of the fixed off-centre of a collar structure example.
Fig. 5 is the side view of " Fig. 4 ".
Fig. 6 is the fixed eccentric double piston-rod fluid driven cylinder structure example of collar.
Figure number explanation among Fig. 1, Fig. 2, Fig. 3, Fig. 4, Fig. 5, Fig. 6:
(01), cylinder body; (02), piston rod; (03), piston; (04), antifriction bearing ring, (05), (06), big sealing ring; (07), tightening nut; (08), front end housing; (09), sliding bearing; (10), rolling bearing; (11), front end housing seal ring; (12), back cylinder cover; (13), axial attachment screw; (14), hole collar; (15), permanent magnet; (16), conical surface straight pin; " E1 ", the offset in piston rod and cylinder cap mider hole and cylinder hole; " E2 ", the offset at cylinder cap periphery center and center, cylinder hole; " K1 ", " K2 ", fluid passage (fluid inlet and outlet).
Below, the 2--accompanying drawing 6 in conjunction with the accompanying drawings, describe the structural feature and the working principle of the eccentric piston rod type liquid driving cylinder that proposes according to the present invention in detail.
As shown in Figure 2, this fluid driven cylinder is mainly by cylinder body (01), piston rod (02), (two-piece type) piston (03), antifriction bearing ring (04), big sealing ring (05), (06), tightening nut (07), front end housing (08), sliding bearing (09), needle bearing (10), front end housing seal ring (11), back cylinder cover (12), attachment screw component such as (13) are formed.Suitable position at cylinder body (01) two ends, being provided with the fluid passage is that fluid inlet and outlet " K1 " reaches " K2 ".
As can be seen from the figure, the axis of piston rod (02) and front and back, cylinder cap (08) all have an off-centre " E1 " between the axis in axially bored line on (12) and cylinder hole.Fastening in addition between piston (03) and the piston rod (02) by nut (07), make between the two and can not produce any relative movement.Like this, piston rod and piston just can't can only be done axial motion with respect to any rotational.
When radial load or moment of rotation acted on the piston rod, the part circular surface that then can make piston rod and piston produced with separately matching surface respectively and contacts, and contacted counter-force thus and formed countertorque.In order to reduce the eccentric wear that causes because of this contact counter-force, periphery at piston is provided with an antifriction bearing ring (04) free to rotate, and between the eccentric opening and piston rod of cylinder cap, then be provided with a needle bearing (10) and a sliding bearing (09) (in case of necessity, sliding bearing can be integrated with the inner ring of needle bearing).Like this, the internal surface of sliding bearing contacts with piston rod, and roll the intermittence of rolling bearing, then can constantly change the contact position of sliding bearing internal surface and piston rod, so that the wearing and tearing of whole bearing inner surface evenly.Because generally speaking, the moment of rotation that acts on the pneumatic piston bar is also little, thus can design the off-centre between piston rod and the cylinder hole very for a short time, to reduce owing to the axial force that acts on the piston does not overlap the moment that produces as far as possible.
Offer fluid passage " K1 " at the two ends of cylinder body and reach " K2 ", when pressure fluid enters and " K2 " when being switched to low pressure pipeline from " K1 ", piston rod just produces the motion to right direction, and vice versa.
By attachment screw (13) axial restraint in addition, prevent the rotation of cylinder cap simultaneously between cylinder cap and the cylinder hole.Mounting flange periphery on the cylinder cap both can be the form concentric with the cylinder hole, also can be the form concentric with piston rod, and structure shown in the accompanying drawing 3 is the periphery of the mounting flange structure concentric with piston rod.
Accompanying drawing 4 has been represented the structure according to the another kind of eccentric single-piston rod formula fluid driven cylinder of the present invention's proposition.Different with previous embodiment is, in the present embodiment, the two ends cylinder cap is not that axially to reach rotation by attachment screw fixing, but by the bigger eccentric side opening of two diameters and realize axially with collar in holes and rotation is fixing, with further simplified structure and reduce the axial dimension of fluid driven cylinder.
In order to prevent the rotation of cylinder cap with respect to cylinder body itself, cylinder cap periphery and side opening with matching center and center, cylinder hole also exist an offset " E2 ".
Embodiment is by cylinder body (01), piston rod (02), one-piece piston (03), antifriction bearing ring (04), big sealing ring (05), (06), tightening nut (07), front end housing (08), sliding bearing (09), ball bearing (10a), front end housing seal ring (11), back cylinder cover (12), two hole collars (14), permanent magnet component such as (15) are formed.Suitable position at the cylinder body two ends offers fluid passage " K1 " and reaches " K2 ".
When pressure fluid from the fluid passage " K1 ", when " K2 " sent to the both sides of piston in turn, piston rod just can be under the promotion of piston, accordingly to the right, left is to motion.With previous embodiments, because piston and piston rod are for being fastenedly connected, the piston rod center line has an off-centre " E1 " with respect to center, cylinder hole, and also there is an off-centre " E2 " at cylinder cap periphery center and center, cylinder hole, so piston and piston rod can only be done axial motion and can not rotate with respect to cylinder body.
The purpose of permanent magnet (15) is set on piston (03), is for the ease of making location sensitive type fluid driven cylinder.
Offered an annular groove in the piston left side, the right-hand member of this annular groove and sliding bearing is a Spielpassung, to constitute a simple type damping device.
Accompanying drawing 6 is used for the embodiment of eccentric double-piston rod-type fluid driven cylinder for the present invention.
Compare with aforementioned two embodiments, the difference of present embodiment is that piston rod stretches out forward and backward cylinder cap simultaneously, so can provide straight line motion and driving force to the cylinder body both sides.Therefore, on the cylinder cap of front and back, all be provided with sliding bearing (09) and seal ring (11).Consider that in some applications the torque and the very little radial load that promptly acts between the slip surface of radial load that act on the piston rod are very little, for simplified structure as far as possible and cut down finished cost, adopted the low cost structure design in the present embodiment.
As shown in Figure 6, present embodiment is by cylinder body (01), piston rod (02), one-piece piston (03), big sealing ring (05), (06), front end housing (08), back cylinder cover (12), two hole collars (15), two sliding bearings (09) are formed the taper pin component such as (16) that piston and piston rod link into an integrated entity.There is an off-centre " E1 " at endoporus on the piston and piston rod center with respect to the cylinder hole, also there is an off-centre " E2 " at side opening center that the periphery of cylinder cap and both sides diameter are bigger and center, cylinder hole, thereby guarantee that piston and piston rod can't drive that cylinder cap rotates with respect to cylinder body together and can only be reciprocating.
Suitable position at the cylinder body two ends, the import and export " K1 " that offer the fluid passage and be fluid reach " K2 ".On the both ends of the surface of piston, offered two annular grooves, respectively with the front and back cylinder cap on bearing supporting protuberance form Spielpassung, constitute two simple type damping devices.
Because the working principle and the structural feature thereof of present embodiment are basic identical with aforementioned two embodiments, so do not give unnecessary details at this.
If suitable adjustable type vibration reduction and cushioning device is set between piston and two ends cylinder cap, just can obtain the good various fluid driven cylinders of dynamic performance.
Point out in passing, the basic principle of utilizing the present invention to propose is the basic structure of piston rod axis and cylinder axially bored line decentraction, can also produce various dissimilar fluid driven cylinders such as the telescopic fluid cylinder of the many pistons of single-acting, the telescopic fluid cylinder of the many pistons of double-action and other derivatives etc.
Claims (3)
1. piston rod type fluid driven cylinder, comprise cylinder body (01), piston rod (02), piston (03), big sealing ring (05,06), tightening nut (07), front end housing (08), sliding bearing (09), cylinder cap seal ring (11), back cylinder cover (12), it is characterized in that, can not do between cylinder cap and the cylinder body relative axially and rotatablely move, a throw of eccentric is arranged between the axis in the axis of piston rod and cylinder hole.
2. piston rod type fluid driven cylinder according to claim 1, it is characterized in that adopting the hole to make the cylinder cap axial restraint with collar, both sides in cylinder body master cylinder hole, two eccentric side openings that cooperate with the cylinder cap cylindrical have been offered respectively, the center of this off-centre side opening can not be concentric with the master cylinder hole, can be not concentric with piston rod yet, that is to say to have a throw of eccentric (E at the endoporus that makes cylinder cap and piston rod and center, cylinder hole
1) time, make between the periphery of cylinder cap and two ends side opening and the master cylinder hole also to have an offset (E
2).
3. piston rod type liquid driven cylinder according to claim 1 and 2 is characterized in that being provided with a rolling bearing, is used to drive sliding bearing, does intermittently to roll, constantly to change the contact friction position of sliding bearing and piston rod.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN94105701A CN1053954C (en) | 1994-05-24 | 1994-05-24 | Piston rod type fluid driving cylinder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN94105701A CN1053954C (en) | 1994-05-24 | 1994-05-24 | Piston rod type fluid driving cylinder |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1114011A CN1114011A (en) | 1995-12-27 |
| CN1053954C true CN1053954C (en) | 2000-06-28 |
Family
ID=5032151
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN94105701A Expired - Lifetime CN1053954C (en) | 1994-05-24 | 1994-05-24 | Piston rod type fluid driving cylinder |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1053954C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100420857C (en) * | 2004-01-20 | 2008-09-24 | 中国科学院长春光学精密机械与物理研究所 | Pneumatic linear driving mechanism |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102015218063A1 (en) | 2015-09-21 | 2017-03-23 | Schunk Gmbh & Co. Kg Spann- Und Greiftechnik | Automation component or clamping device with a piston |
| CN108343691B (en) * | 2018-03-09 | 2024-04-26 | 克诺尔车辆设备(苏州)有限公司 | Driving structure for tread braking unit |
| CN110410601A (en) * | 2019-08-23 | 2019-11-05 | 张伟国 | The method and gyrator of a kind of pressurized fluid driven gyrator and automatic oil filling riser |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN86201033U (en) * | 1986-02-24 | 1987-07-15 | 夏延栋 | Jointing device for hydraulic cylinder body and external clasp of guide sleeve |
-
1994
- 1994-05-24 CN CN94105701A patent/CN1053954C/en not_active Expired - Lifetime
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN86201033U (en) * | 1986-02-24 | 1987-07-15 | 夏延栋 | Jointing device for hydraulic cylinder body and external clasp of guide sleeve |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100420857C (en) * | 2004-01-20 | 2008-09-24 | 中国科学院长春光学精密机械与物理研究所 | Pneumatic linear driving mechanism |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1114011A (en) | 1995-12-27 |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CI01 | Publication of corrected invention patent application |
Correction item: Invention affairs Correct: delete False: Termination of patent right Number: 30 Page: 263 Volume: 17 |
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Free format text: CORRECT: INVENTION AFFAIRS; FROM: CESSATION OF PATENT RIGHT TO: DELETION |
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| C17 | Cessation of patent right | ||
| CX01 | Expiry of patent term |
Expiration termination date: 20140524 Granted publication date: 20000628 |