GB2113764A - Rotary actuators - Google Patents
Rotary actuators Download PDFInfo
- Publication number
- GB2113764A GB2113764A GB08234988A GB8234988A GB2113764A GB 2113764 A GB2113764 A GB 2113764A GB 08234988 A GB08234988 A GB 08234988A GB 8234988 A GB8234988 A GB 8234988A GB 2113764 A GB2113764 A GB 2113764A
- Authority
- GB
- United Kingdom
- Prior art keywords
- piston
- cylinder
- piston rod
- shaft
- remote
- 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.)
- Withdrawn
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
- F15B15/06—Mechanical layout characterised by the means for converting the movement of the fluid-actuated element into movement of the finally-operated member for mechanically converting rectilinear movement into non- rectilinear movement
- F15B15/068—Mechanical layout characterised by the means for converting the movement of the fluid-actuated element into movement of the finally-operated member for mechanically converting rectilinear movement into non- rectilinear movement the motor being of the helical type
-
- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62C—FIRE-FIGHTING
- A62C31/00—Delivery of fire-extinguishing material
- A62C31/02—Nozzles specially adapted for fire-extinguishing
- A62C31/24—Nozzles specially adapted for fire-extinguishing attached to ladders, poles, towers, or other structures with or without rotary heads
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B3/00—Spraying or sprinkling apparatus with moving outlet elements or moving deflecting elements
- B05B3/02—Spraying or sprinkling apparatus with moving outlet elements or moving deflecting elements with rotating elements
Landscapes
- Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- Public Health (AREA)
- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Actuator (AREA)
- Fluid-Damping Devices (AREA)
- Power Steering Mechanism (AREA)
Abstract
A rotary actuator comprises a cylinder 12 with a cup-shaped end cap 15, and an internally splined annular piston 11 with a piston rod 16 which has helically inclined teeth 19 on its external surface. The teeth 19 are engaged by a nut 14 fixed to the cylinder, and the internal splines 23 of the piston are engaged by a splined shaft 20 which projects from one end of the cylinder and which constitutes the output shaft. The end of the piston rod 16 remote from the piston is sealed by a plug 17 replaceable by a different length plug for limiting movement and a passage 31 through the piston places the interior of the piston rod in permanently open communication with the cylinder space at the opposite side of the piston. Pressure fluid can be supplied to either side of the piston. As the piston moves axially it is constrained by the nut 14 to rotate, the rotation being transmitted to the output shaft through the splined connection. <IMAGE>
Description
SPECIFICATION
Improvements relating to rotary actuators
This invention relates to rotary actuators and has a particularly useful but not exclusive application in driving a remote control monitor in fire-fighting.
According to this invention there is provided a rotary actuator comprising a piston having a piston rod the external surface of which is formed with one or more helical ribs and/or grooves, a cylinder in which the piston is slidably mounted and which totally encloses the piston and piston rod, a nut fixed with respect to the cylinder and engaged with the helical rib(s) and/or groove(s) on the piston, a shaft mounted in a bearing at the end of the cylinder remote from the piston rod for rotation coaxially with the piston said shaft having one end thereof projecting from the cylinder and having its other end portion in splined engagement with the piston over the full axial extent of sliding movement of the piston, and means whereby pressure fluid can be supplied to the cylinder space at each side of the piston.
According to a preferred feature of the invention the piston rod is hollow and accommodates any portion of the shaft projecting axially beyond the splines during axial movement of the piston and the hollow interior of the piston is sealed from the cylinder space surrounding the piston rod but is in permanently open communication with the cylinder space at the side of the piston remote from the piston rod.
One embodiment of the invention will now be described with reference to the accompanying drawing which shows, in axial section, a rotary actuator according to the invention.
Referring to the drawing, the actuator is a hydraulic actuator incorporating a cylinder 10 and piston 1 The cylinder comprises a main body 1 2 having an annular first end cap 13 secured to one end thereof, and a nut 14 and a cup-shaped second annular end cap 1 5 secured to the other end. The piston has a hollow piston rod 1 6 the end of which remote from the piston is sealed by a plug 1 7 threaded into the piston rod and carrying a stop bolt 1 8. The external surface of the piston rod has a number of helical ribs 1 9 which are engaged in complementary grooves in the nut 14, so that axial movement of the piston causes the piston and piston rod to rotate.The angle of rotation can be varied either by changing the length of screw-thread form on the piston or by replacing the stop bolt 1 8 by a longer bolt. In the particular example illustrated, the length and helix angle of the helical ribs are such that the piston rotates through two complete revolutions (7200.) in moving from one end to the other of its axial travel. The piston rod 1 6 is enclosed by the cupshaped end cap 1 5.
An output shaft 20 is mounted coaxially with the piston in a bearing 22 in the end cap 13 and has one end portion projecting from the cylinder.
The other end portion of the shaft is splined along
the whole of its length within the cylinder and extends along the full length of the cylinder, and is
in splined engagement with a complementary
formation at 23 in the piston. Thus the rotational
movement of the piston 11 is transmitted to the
output shaft 20. An annular rib 24 on the shaft is
disposed in a recess on the inner face of the end
cap 13 and a circlip 25 engaged in a groove in the
recess locates the rib axially between itself and
the bottom of the recess to take the small axial
thrusts on the shaft resulting from friction in the
splined connection and fluid pressure acting on
the inner end face of the shaft.
First and second connection points 26, 27 for
the supply of pressure fluid to opposite sides of
the piston are respectively formed in the two end
caps 13, 1 5. Connection point 26 leads through a
short axial passage 28 to the cylinder space 29 at
one side of the piston. Connection point 27 leads
via a radial passage 29 to the interior of the cup
formation, and a transfer passage 30 extends
axially through the nut to the cylinder space at the
other side of the piston. A passage 31 extends
through the piston from cylinder space and opens
to the space between the shaft and the piston rod.
It will therefore be seen that the effective areas of
the two sides of the piston are the same and are
substantially equal to the cross-sectional area of
the bore of the main body 12 of the cylinder.
At the two limits of its movement the piston
comes into abutment with the end cap 1 3 and
stop bolt 18.
1. A rotary actuator comprising a piston having
a piston rod the external surface of which is
formed with one or more helical ribs and/or
grooves, a cylinder in which the piston is slidably
mounted and which totally encloses the piston
and piston rod, a nut fixed with respect to the
cylinder and engaged with the helical rib(s) and/or
groove(s) on the piston, a shaft mounted in a
bearing at the end of the cylinder remote from the
piston rod for rotation coaxially with the piston
said shaft having one end thereof projecting from
the cylinder and having its other end portion in
splined engagement with the piston over the full
axial extent of sliding movement of the piston, and
means whereby pressure fluid can be supplied to
the cylinder space at each side of the piston.
2. A rotary actuator as claimed in claim 1,
wherein the piston rod is hollow and
accommodates any portion of the shaft projecting
axially beyond the splines during axial movement
of the piston and wherein the hollow interior of the
piston is sealed from the cylinder space
surrounding the piston rod but is in permanently
open communication with the cylinder space at
the side of the piston remote from the piston rod.
3. A rotary actuator as claimed in claim 1 or
claim 2, wherein a stop bolt is mounted at the end
of the piston rod remote from the piston and
comes into abutment with that end of the cylinder,
**WARNING** end of DESC field may overlap start of CLMS **.
Claims (4)
1. A rotary actuator comprising a piston having
a piston rod the external surface of which is
formed with one or more helical ribs and/or
grooves, a cylinder in which the piston is slidably
mounted and which totally encloses the piston
and piston rod, a nut fixed with respect to the
cylinder and engaged with the helical rib(s) and/or
groove(s) on the piston, a shaft mounted in a
bearing at the end of the cylinder remote from the
piston rod for rotation coaxially with the piston
said shaft having one end thereof projecting from
the cylinder and having its other end portion in
splined engagement with the piston over the full
axial extent of sliding movement of the piston, and
means whereby pressure fluid can be supplied to
the cylinder space at each side of the piston.
2. A rotary actuator as claimed in claim 1,
wherein the piston rod is hollow and
accommodates any portion of the shaft projecting
axially beyond the splines during axial movement
of the piston and wherein the hollow interior of the
piston is sealed from the cylinder space
surrounding the piston rod but is in permanently
open communication with the cylinder space at
the side of the piston remote from the piston rod.
3. A rotary actuator as claimed in claim 1 or
claim 2, wherein a stop bolt is mounted at the end
of the piston rod remote from the piston and
comes into abutment with that end of the cylinder, the bolt being replaceable by a stop bolt of a different length to vary the axial position of the piston at which said abutment occurs.
4. A rotary actuator substantially as hereinbefore described with reference to and as illustrated in the accompanying drawings.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB8138839 | 1981-12-23 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB2113764A true GB2113764A (en) | 1983-08-10 |
Family
ID=10526825
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB08234988A Withdrawn GB2113764A (en) | 1981-12-23 | 1982-12-08 | Rotary actuators |
Country Status (4)
| Country | Link |
|---|---|
| DE (1) | DE3246977A1 (en) |
| FR (1) | FR2518414A1 (en) |
| GB (1) | GB2113764A (en) |
| IT (1) | IT1155039B (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2182721A (en) * | 1985-11-09 | 1987-05-20 | Hytork Actuators Ltd | Improvements in or relating to fluid-pressure-operated actuators |
| GB2299562A (en) * | 1995-04-01 | 1996-10-09 | Nigel Howard Mckrill | Actuator for helicopter rotor blade aileron |
| CN109676364A (en) * | 2019-03-06 | 2019-04-26 | 成都华川电装有限责任公司 | Screw assembles device |
| CN110273938A (en) * | 2018-03-16 | 2019-09-24 | 西安博贤机电设备有限公司 | A kind of annular axis clutch cylinder |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3639121A1 (en) * | 1986-11-15 | 1988-05-19 | Hausherr & Soehne Rudolf | Device for converting a stroke movement into a rotary movement |
| DE3706121A1 (en) * | 1987-02-25 | 1988-09-08 | Wolf Woco & Co Franz J | Actuating drive |
| DE102015209725A1 (en) * | 2015-05-27 | 2016-12-01 | Nussbaum Technologies Gmbh | Hydraulically operated barrier |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1229392B (en) * | 1959-06-03 | 1966-11-24 | Pleiger Maschf Paul | Hydraulic swivel drive for left and right rotation with limited angle of rotation |
| GB1055694A (en) * | 1964-06-04 | 1967-01-18 | Inst Schiffbautechnik Wolgast | Swivel device |
| US3977305A (en) * | 1971-09-13 | 1976-08-31 | C.O. Hansen Maskinfabrik Af 1970 A/S | Operating mechanism for turning an axle end |
| FR2455201A1 (en) * | 1979-04-27 | 1980-11-21 | Renault | Rotating hydraulic cylinder - is located between bearings and has splined piston and side connections for hydraulic fluid |
-
1982
- 1982-12-08 GB GB08234988A patent/GB2113764A/en not_active Withdrawn
- 1982-12-18 DE DE19823246977 patent/DE3246977A1/en not_active Withdrawn
- 1982-12-21 IT IT24885/82A patent/IT1155039B/en active
- 1982-12-22 FR FR8221594A patent/FR2518414A1/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2182721A (en) * | 1985-11-09 | 1987-05-20 | Hytork Actuators Ltd | Improvements in or relating to fluid-pressure-operated actuators |
| GB2299562A (en) * | 1995-04-01 | 1996-10-09 | Nigel Howard Mckrill | Actuator for helicopter rotor blade aileron |
| CN110273938A (en) * | 2018-03-16 | 2019-09-24 | 西安博贤机电设备有限公司 | A kind of annular axis clutch cylinder |
| CN109676364A (en) * | 2019-03-06 | 2019-04-26 | 成都华川电装有限责任公司 | Screw assembles device |
| CN109676364B (en) * | 2019-03-06 | 2024-04-02 | 成都华川电装有限责任公司 | Screw assembling device |
Also Published As
| Publication number | Publication date |
|---|---|
| DE3246977A1 (en) | 1983-06-30 |
| IT1155039B (en) | 1987-01-21 |
| IT8224885A0 (en) | 1982-12-21 |
| IT8224885A1 (en) | 1984-06-21 |
| FR2518414A1 (en) | 1983-06-24 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |