GB2176536A - Fluid operated linear actuator - Google Patents
Fluid operated linear actuator Download PDFInfo
- Publication number
- GB2176536A GB2176536A GB08515253A GB8515253A GB2176536A GB 2176536 A GB2176536 A GB 2176536A GB 08515253 A GB08515253 A GB 08515253A GB 8515253 A GB8515253 A GB 8515253A GB 2176536 A GB2176536 A GB 2176536A
- Authority
- GB
- United Kingdom
- Prior art keywords
- working cylinder
- stator
- ball
- guided
- moving part
- 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
- 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
- F15B15/02—Mechanical layout characterised by the means for converting the movement of the fluid-actuated element into movement of the finally-operated member
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Actuator (AREA)
Abstract
An actuator has a piston slidable in a bore formed in a housing (1), the piston being coupled to a part (6) guided for longitudinal movement along the housing (1) by respective guideways (3) and interposed rolling elements (4). The housing (1) and part (6) may be in the form of aluminium extrusions and the guideways (3) in the form of steel inserts. Position sensors for detecting the ends of stroke may be provided on adjustable stops (5) fixable in longitudinal T-shaped slots 17 in the housing. <IMAGE>
Description
SPECIFICATION
Ball-guided working cylinder
The invention relates to a ball-guided working cylinder with pneumatic or hydraulic operation, which-used as a universal machine element-serves for carrying out accurate and straight-line motions.
Machine designers often use hydraulic and pneumatic working cylinders as driving elements of linear units. Such a linear unit consists of two basic elements, such as the guideway and the working cylinder. As for the guideway, it can be sliding or rolling one; the task of it is to ensure accurate turning and motion usually without any play, and to take load differing from direction of motion, arising during operation or incidentally. In case when the stroke of the working cylinder is more than the motion required or the end position of the motion requires more accuracy, the guideway are provided with stops. These stops are performed in such a way, that they are changeable on request to enable adjusting the end position of the motions.
To sense the end position of the motions, in order to control meshing processes of a machine, the guideways are often provided with end position sensors. These linear units consisting of a guideway and working cylinder are not tight enough so they are larger and heavier than it is required. Moreover they are expensive, due to their complicated setting up and their piece or small series production.
Although, there are several firms turning out rolling guideways and another several, turning out pneumatic cylinders, various types of both protected by patents, such a universal machine element is still not available, which could substitute a complete linear unit while keeping its accuracy and load capacity, but is more tight, smaller, lighter and cheaper than traditionally performed, piece production combinations.
Ball-guided working cylinder according to present invention with pneumatic or hydraulic operation can be used as a universal machine element for carrying out accurate and straightline motions.
The ball-guided working cylinder consists of a stator made of aluminum alloy, preferably through extrudation, bore of which is the pneumatic working cylinder itself, while said stator forms the stator of the rolling guideways as well, with inserts made preferably of steel (e.g. steel wire or steel ribbon), on which rolling elements, in most of cases steel balls held in a ball basket are rested, while on the other hand said cylinder consists of a moving part which forms the moving part of the rolling guideway as well, with inserts made preferably of steel, e.g. steel wire or steel ribbon.
In case of ball-guided working cylinder with adjustable stroke it is preferable, to provide the stator with longitudinal T-shaped slots to catch the adjustable stops. Possibility of damping end position can be ensured in case of changing stroke-lenght as well, if the structure is set up in such a way, that at least one of the inner stops inside the cylinder is not fixed, but adjustable in stroke direction, preferably with the help of a screw-thread.
Ball-guided working cylinder can be completed with pneumatic, magnetic or electric end position sensors.
Ball-guided working cylinder according to the invention will be explained in details by the way of an example in connection with the accompanying drawings, where
Figure 1 illustrates the front side of the ballguided working cylinder in cross-section,
Figure 2 is a cross-section of the top view of the ball-guided working cylinder, and
Figure 3 shows a side view of said working cylinder in cross-section.
In a bore 15 of a stator 1 made of aluminum alloy-in sace of serie production through extrudation-a piston 2 is arranged.
There are slots 16 running along the top part of stator 1, for staying steel wires 3 where series of steel balls held in a ball basket are resting. T-shaped slots 17 running along the right side of stator 1 according to Fig. 3, serves the purpose of catching adjustable stops 15. Moving part 6 of the preferred embodiment according to the invention is made of aluminum alloy-in serie production through extrudation-as well, having inner slots 18 running along the inner side, serving for the purpose of staying steel wires 3. Threaded bores of stop 5 ensure catching of end position sensors. The inner stop 8 can have a performance of a blind hole 19-as shown in the drawing-but it also can be performed with through hole for introduction of a working medium. Adjusting in axial direction e.g.
with the help of a screw-thread the inner stop 8 performed with a through hole, an adjustable, end position damped stopping can be achieved.
Ball-guided working cylinder functions as follows: Fastening from the front side through bores 9 of the stator 1 can be carried out, or with the help of steel panel nuts 10 from behind. Part or unit to be moved strictly guided by the ball-guided working cylinder can be fixed with the help of panel nuts 11 of the moving part 6. Introducing air into the chamber behind or before the piston 2 thorugh air holes 12, the piston 2 moves forward or backward carrying the moving part 6 by a plate 13 with, which rolls forward guided by series of steel balls held in a ball basket 4 resting on steel wires 3. A block 14 made of a non-rigid material,-according to our example-fixed on the moving part 6, reaching the adjustable stop 5, stops the moving part when the end position sensor 7, here a microswitch, switches over.
As it follows from the above, the ballguided working cylinder ensures an accurate motion and big load capacity, due to its inserted rollign guideway. Said working cylinder can be completed with adjustable end position stops and sensors to be able to fulfill requirements usually expected from a linear unit, at the same time it is less, has a tight arrangement and it is light due to its light metal material.
Moreover, said working cylinder is longlived, due to its steel inserts and no greasing and service is needed.
Main elements are performed through extrudation in running metres which makes the apparatus cheap. Making working cylinders with less or more maximal stroke can be carried out by varying of cutting lengths.
Claims (4)
1. Ball-guided working cylinder with pneumatic or hydraulic operation, used as a universal machine unit, for carrying out accurate, straight-line motions, characterized in, that it consists of-on one hand-a stator (1) made of aluminum alloy through extrudation, bore of which is the pneumatic working cylinder itself, and stator of the rolling guideway is formed by the stator (1) with the help of inserts (3) made of steel wire or ribbon on which rolling elements, preferably a set of steel balls (4) held in a ball basket are rested, while on the other hand it consists of a moving part (6) which at the same time is the moving part of the rolling guideway as well, with inserts made of steel wire (3) or ribbon.
2. Ball-guided working cylinder according to Claim 1, characterized in, that stator (1) has longitudinal T-shaped slots (17) with adjustable stops (5) fixed thereon.
3. Ball-guided working cylinder according to Claim 1, characterized in, that at least one of inner stops (8) in the bore of stator (1) is adjustable in stroke direction, preferably with the help of a screw-thread.
4. Ball-guided working cylinder according to any of Claims 1 to 3, characterized in, that stator (1) is provided with pneumatical, magnetical and electrical, respectively, end position sensors (7).
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19853513214 DE3513214A1 (en) | 1985-04-12 | 1985-04-12 | WORK CYLINDERS WITH BALL GUIDE |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB8515253D0 GB8515253D0 (en) | 1985-07-17 |
| GB2176536A true GB2176536A (en) | 1986-12-31 |
| GB2176536B GB2176536B (en) | 1989-07-12 |
Family
ID=6267882
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB8515253A Expired GB2176536B (en) | 1985-04-12 | 1985-06-17 | Fluid-operated linear actuator |
Country Status (2)
| Country | Link |
|---|---|
| DE (1) | DE3513214A1 (en) |
| GB (1) | GB2176536B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2188098A (en) * | 1986-03-21 | 1987-09-23 | Festo Kg | Piston and cylinder linear motor |
| ITBS20090059A1 (en) * | 2009-03-25 | 2010-09-26 | Gimatic Spa | ADJUSTABLE BALL GUIDE SYSTEM |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3820337A1 (en) * | 1988-06-15 | 1989-12-21 | Expert Maschbau | PISTON-CYLINDER UNIT WITH ROTATIONAL PROTECTED PISTON ROD |
| DE29706226U1 (en) * | 1997-04-08 | 1997-05-28 | Festo Kg, 73734 Esslingen | Management facility |
| DE502004000628D1 (en) * | 2004-03-01 | 2006-06-29 | Festo Ag & Co | Linear drive with a slide flanked by two guide units |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB258423A (en) * | 1925-09-16 | 1926-09-23 | Beardmore William & Co | Improvements in ramming devices |
| GB931465A (en) * | 1961-05-11 | 1963-07-17 | Bristol Siddeley Engines Ltd | Fluid pressure responsive actuating device |
| GB1301951A (en) * | 1969-02-15 | 1973-01-04 | ||
| GB1394281A (en) * | 1972-05-26 | 1975-05-14 | Clarke Chapman Ltd | Tool positioning and guiding equipment with hydraulic piston- and-cylinder device |
-
1985
- 1985-04-12 DE DE19853513214 patent/DE3513214A1/en not_active Withdrawn
- 1985-06-17 GB GB8515253A patent/GB2176536B/en not_active Expired
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB258423A (en) * | 1925-09-16 | 1926-09-23 | Beardmore William & Co | Improvements in ramming devices |
| GB931465A (en) * | 1961-05-11 | 1963-07-17 | Bristol Siddeley Engines Ltd | Fluid pressure responsive actuating device |
| GB1301951A (en) * | 1969-02-15 | 1973-01-04 | ||
| GB1394281A (en) * | 1972-05-26 | 1975-05-14 | Clarke Chapman Ltd | Tool positioning and guiding equipment with hydraulic piston- and-cylinder device |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2188098A (en) * | 1986-03-21 | 1987-09-23 | Festo Kg | Piston and cylinder linear motor |
| US4838146A (en) * | 1986-03-21 | 1989-06-13 | Kurt Stoll | Fluid pressure actuator with anti-rotation slide attached to piston rod |
| GB2188098B (en) * | 1986-03-21 | 1989-11-15 | Festo Kg | Linear motor |
| ITBS20090059A1 (en) * | 2009-03-25 | 2010-09-26 | Gimatic Spa | ADJUSTABLE BALL GUIDE SYSTEM |
| WO2010109512A3 (en) * | 2009-03-25 | 2010-11-18 | Gimatic S.P.A. | Pre-loaded adjustable ball bearing guide system |
| CN102362076A (en) * | 2009-03-25 | 2012-02-22 | 吉马蒂克有限公司 | Pre-loaded adjustable ball bearing guide system |
| CN102362076B (en) * | 2009-03-25 | 2014-07-02 | 吉马蒂克有限公司 | Pre-loaded adjustable ball bearing guide system |
Also Published As
| Publication number | Publication date |
|---|---|
| GB2176536B (en) | 1989-07-12 |
| GB8515253D0 (en) | 1985-07-17 |
| DE3513214A1 (en) | 1986-10-16 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |