GB2027848A – Pressure-medium activated friction coupling for transmission of torque
– Google Patents
GB2027848A – Pressure-medium activated friction coupling for transmission of torque
– Google Patents
Pressure-medium activated friction coupling for transmission of torque
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Publication number
GB2027848A
GB2027848A
GB7928451A
GB7928451A
GB2027848A
GB 2027848 A
GB2027848 A
GB 2027848A
GB 7928451 A
GB7928451 A
GB 7928451A
GB 7928451 A
GB7928451 A
GB 7928451A
GB 2027848 A
GB2027848 A
GB 2027848A
Authority
GB
United Kingdom
Prior art keywords
space
cavity
pressure medium
pressure
piston means
Prior art date
1978-08-17
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Withdrawn
Application number
GB7928451A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ALBIN MOTOR AB
Original Assignee
ALBIN MOTOR AB
Priority date (The priority date 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 date listed.)
1978-08-17
Filing date
1979-08-15
Publication date
1980-02-27
1979-08-15
Application filed by ALBIN MOTOR AB
filed
Critical
ALBIN MOTOR AB
1980-02-27
Publication of GB2027848A
publication
Critical
patent/GB2027848A/en
Status
Withdrawn
legal-status
Critical
Current
Links
Espacenet
Global Dossier
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Classifications
F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
F16D25/00—Fluid-actuated clutches
F16D25/04—Fluid-actuated clutches in which the fluid actuates an elastic clutching, i.e. elastic actuating member, e.g. a diaphragm or a pneumatic tube
F16D25/042—Fluid-actuated clutches in which the fluid actuates an elastic clutching, i.e. elastic actuating member, e.g. a diaphragm or a pneumatic tube the elastic actuating member rotating with the clutch
F16D25/046—Fluid-actuated clutches in which the fluid actuates an elastic clutching, i.e. elastic actuating member, e.g. a diaphragm or a pneumatic tube the elastic actuating member rotating with the clutch and causing purely radial movement
Abstract
In a friction coupling for interconnecting two machine members (1, 2; 11, 12; 21, 22) insertable one into the other, e.g. a pump impeller on a shaft, a pressure medium is contained within a space (3, 23), defined by a resilient wall (4, 24) and this space also encloses a reciprocating piston means (6, 26) producing dimensional changes in the wall by varying the pressure in the medium. The outside of the wall is adapted for frictional engagement with one member, the dimensional changes therein causing a wedging effect between the members. The piston means and the pressure medium are located within one member (2; 12; 21), in a space essentially made as a cavity therein sealingly defined by the wall facing the other member (1; 11; 22). The coupling can then be made in one piece in one of the two members intended for interconnection and can be kept completely within their contours.
Description
SPECIFICATION
Pressure-medium activated friction coupling for coupling together two machine members or the like which can be inserted one into the other, for example a wheel on a shaft, for transmission of torque between the same
The present invention relates to a pressuremedium activated friction coupling for coupling together two machine members or the like which can be inserted one into the other, for example a wheel on a shaft, for transmission of torque between the same. Known couplings of this type include a space for the pressure medium, delimited by at least one resilient wall.A reciprocating piston means moves in said space so that, by varying the pressure in the medium enclosed in the space, dimensional changes are achieved in said wall, the outside of which is adapted for frictional engagement with one of said members and whose dimensional changes bring about a wedging effect between said members.
As a result of the fact that the known couplings of this type are usually made as separate devices, designed to be mounted between the two machine members or the like to be coupled together, they have a comparatively complicated and demanding design as regards their manufacture. This, together with the fact that they have parts extending outside the two members which require free space and which may also allow dirt and impurities to collect, has prevented their coming into general use in spite of the advantages they offer as a coupling means. For example, due to the protruding parts on the known couplings it is impossible, because of space and sanitary considerations, to use them to fix pump wheels on pump shafts in such pumps as are used in the food processing and chemical-technical industries.It is true that improved couplings of this type have been suggested, in which the pressure-medium space and the piston means are arranged in one of the members, the space essentially consisting of a cavity made in said member, which cavity is sealingly delimited by the resilient wall in the direction facing the other member. In spite of these improvements, these couplings are not suitable where space and sanitation requirements are especially strict since they have piston arrangements which are unnecessarily space-consuming as well as dirt-collecting, so as to be unacceptable for use in the food processing or chemical-technical industries.
Therefore, the purpose of the invention is to remove these disadvantages by suggesting a new and improved form of pressure-medium activated friction coupling of the type described in the introduction, which is simpler and less expensive to manufacture than the known couplings and which does not require any extra space either between or outside the two members which are to be coupled together, and cannot therefore be contaminated in the same manner as the known couplings.
This purpose has been essentially achieved by a coupling made according to the invention and of the type described in the introduction, primarily by virtue of the fact that the pressure medium space as well as the piston means are disposed in one of the machine members intended to be coupled together, the space essentially consisting, in a manner known per se, of a cavity made in said member which is sealingly delimited by the resilient wall in the direction facing the other member, and that the piston means is located in its entirety within said member. By this construction the new and improved coupling device can be manufactured from a minimum of parts, at one time and in one piece with either one of the two members which are to be coupled together and within the contours of which it is completely housed.
An especially simple and reliable embodiment of a coupling according to the invention is obtained if the cavity is in a portion of the member, which portion is intended to engage a corresponding portion of the other member, the cavity being surrounded by the resilient wall. Giving the cavity this form according to the invention provides the advantage that the cavity can be made without difficulty in either one of the two members intended for torsional coupling with each other by means of a simple turned cavity.In a member such as a shaft, for example, which is to be inserted into another member, e.g. a wheel, the cavity can be a turned cavity in the outer periphery, while in the member which is to be attached onto another member, it can consist of a turned cavity in the interior circumference, and the resilient wall in both cases can consist quite simply of a sleeve applied over the turned cavity in question to form a pressure seal, which sleeve forms, together with the cavity, a pressure medium space in the form of an annular gap. In both cases it is then advantageous, for both functional as well as manufacturing considerations, that the pressure medium space in the form of an annular gap be in open communication with an additional pressure medium space in which the reciprocating piston means operates.This additional pressure medium space is in the first case suitably located inside the annular pressure medium space, while in the second case it is suitably located outside it.
While it is possible to make the reciprocating piston means in a coupling according to the invention in a number of different ways, practical and manufacturing considerations make it preferable that it be in threaded engagement with the member in which it is mounted.
The invention will be described in more detail in the following while referring to the accompanying drawings, which show two different embodiments of a pressure mediumactivated friction coupling made according to the invention, used to lock the lobe rotors onto the shafts in an acid-proof so-called lobe rotor pump for use primarily within the food processing and chemical-technical industries.
Figures 1 and 2 shows in two sections through this pump, which are perpendicular to each other, a first embodiment for the coupling according to the invention, while
Figures 3 and 4 show a second embodiment for this coupling in similar perpendicular sections through a single pump shaft with a lobe rotor attached thereon.
In both of the embodiments shown here for a pressure-medium activated friction coupling, the two machine members which can be inserted one into the other and which are to be coupled together for transmission of torque between them, consist of a lobe rotor 1, 11, 21 and a pump shaft 2, 12, 22. The torsional connection between the members which are inserted one into the other is achieved by a pressure medium space 3, 23 which is delimited by a resilient wall 4, 24 This pressure medium space, which is suitably filled with hydraulic oil, is in open communication with an additional pressure medium space 5, 25 in which a reciprocating piston means 6, 26 moves, and by varying the pressure in the medium enclosed in the space 3, 23, dimensional changes are produced in the resilient wall 4, 24, the outside of which is adapted for frictional engagement with the facing member and whose dimensional changes produce a wedging effect between the members 1, 2; 11, 12; 21, 22. Due to the open communication between the additional space 5, 25, in which the piston means 6, 26 moves, and the pressure medium space 3, 23 defined by the resilient wall 4, 24, these two form a common pressure medium space in which the piston means operates. The open communication is achieved through the ducts 7, 27.
According to the invention, the entire pressure medium space 3, 7, 5; 23, 27, 25 and the entire piston means 6, 26 are arranged inside one of the members which engage each other, the pressure medium space essentially consisting of a cavity made in said member, which cavity is sealingly delimited by the resilient wall 4, 24 and which faces towards the other member.
In the embodiment shown in Figs. 1 and 2, the cavity is a turned cavity 8 in the outer periphery of the pump shafts 2, 1 2 which can be inserted into the lobe rotors 1, 11. The resilient wall 4 in its turn consists of a sleeve mounted to form a pressure seal over this turned cavity 8. This sleeve, together with the cavity, forms a pressure medium space which has the form of an annular gap. It is in open communication via the duct 7 with the additional pressure medium space 5, in which the piston means 6 operates. In the second em bodiment shown in Figs. 3 and 4, the cavity consists of a turned cavity 28 in the interior circumference of the lobe rotor 21, which is mounted on the pump shaft 22.In this embodiment as well, the resilient wall 24 has the form of a sleeve which is mounted to form a pressure seal over the cavity. The sleeve, together with the cavity, forms a pressure medium space in the form of an annular gap.
The open communication between this gap and the additional pressure medium space 25, in which the piston means 26 operates, is effected via the duct 27.
In both of the embodiments shown here for the coupling according to the invention, the reciprocally movable piston means 6, 26 is in threaded engagement with the shaft 2, 1 2 or the lobe rotor 21, in which it is mounted.
More specifically, the piston means has an axially extending threaded portion 9, 29 which engages a correspondingly threaded bore in the shaft 2, 12 or lobe rotor 21 in question.
From the two embodiments shown here for a coupling according to the invention, it is evident that the cavity for the pressure medium can have the form of a cavity in a portion of one of the two members to be coupled together, said portion being intended to engage a corresponding portion of the other member, said cavity being enclosed by the resilient wall which suitably has the form of an enclosing sleeve 4, 24 which can be welded fast to the associated member whether this is the pump shaft 2, 1 2 or the lobe rotor 21.
For obvious reasons, the cavity in the coupling for the pressure medium should be able to be vented. In both of the embodiments shown here this is achieved by making it possible for a portion of the cavity remote from the piston means to be put in communi- cation with the outside air via a duct 30, from which a sealing plug 31 can be removed as needed.
In the embodiment shown in Figs. 1 and 2 for a coupling according to the invention, an example is also shown of how such a coupling can be used to fix the inner bearing race to a slide bearing surrounding the outer end of the shaft. This is illustrated especially well by the lower shaft 1 2 in said figures. The outer end of this shaft is extended and journalled in the end wall of the pump with the aid of a bushing, whose inner bearing race is mounted, together with the lobe rotor 11, onto the shaft with the aid of the device according to the invention.
The invention is not limited to the examples described above and shown in the drawings, but can be modified in a variety of ways within the scope of the claims.
Claims (9)
1. A pressure-medium activated friction coupling for coupling together two machine members or the like which can be inserted one into the other, for example a wheel on a shaft, for transmission of torque between the same, comprising a space for the pressure medium, delimited by a least one resilient wall, in which space a reciprocating piston means moves so that, by varying the pressure in the medium enclosed in the space, dimensional changes are achieved in said wall, the outside of which is adapted for frictional engagement with one of the members and the dimensional changes in which bring about a wedging effect between the members, characterized in that the pressure medium space as well as the piston means are disposed in one of the machine members intended to be coupled together, the space essentially consisting, in a manner known per se, of a cavity made in said member which is sealingly delimited by the resilient wall in the direction towards the other member and that the piston means is located in its entirety within said member.
2. A coupling according to claim 1, characterized in that the cavity has the form of a cavity in a portion of one member, said portion being intended to engage a corresponding portion of the other member, and that this cavity is enclosed by the resilient wall.
3. A coupling according to claim 1 or 2, characterized in that the cavity consists of a turned cavity in the outer periphery of one member, a shaft for example, which can be inserted into the other member, a wheel for example, and that the resilient wall consists of a sleeve mounted so as to make a pressure seal over said turned cavity, said sleeve together with the turned cavity forming a pressure medium space which has the form of an annular gap.
4. A coupling according to claim 3, characterized in that the pressure medium space in the form of an annular gap is in open communication with an additional pressure medium space which is located inwardly of said first-mentioned space and in which additional space the reciprocating piston means operates.
5. A coupling according to claim 1 or 2, characterized in that the cavity consists of a turned cavity in the inner circumference of the member, a wheel for example, which can be put onto the other member, a shaft for example, and that the resilient wall consists of a sleeve mounted so as to make a pressure seal over said turned cavity and which, together with the turned cavity, form a pressure medium space which has the form of annular gap.
6. A coupling according to claim 5, characterized in that the pressure medium space in the form of an annular gap is in open communication with an additional pressure medium space which is located outwardly of said first-mentioned space and in which additional space the reciprocating piston means operates.
7. A coupling according to any one or more of the preceding claims, characterized in that the reciprocating piston means is in threaded engagement with the member in which it is mounted.
8. A coupling substantially as hereinbefore descirbed with reference to Figs. 1 and 2 in the accompanying drawings.
9. A coupling substantially as hereinbefoe described with reference to figs. 3 and 4 in the accompanying drawings.
GB7928451A
1978-08-17
1979-08-15
Pressure-medium activated friction coupling for transmission of torque
Withdrawn
GB2027848A
(en)
Applications Claiming Priority (1)
Application Number
Priority Date
Filing Date
Title
SE7808719A
SE7808719L
(en)
1978-08-17
1978-08-17
PRINTED MEDICINE FRICTION COUPLING FOR COUPLING TWO IN EACH OTHER INFORMABLE MACHINE ELEMENTS OR SIMILAR, FOR EXAMPLE A WHEEL ON A SHAFT, FOR TORQUE TRANSMISSION BETWEEN THESE
Publications (1)
Publication Number
Publication Date
GB2027848A
true
GB2027848A
(en)
1980-02-27
Family
ID=20335605
Family Applications (1)
Application Number
Title
Priority Date
Filing Date
GB7928451A
Withdrawn
GB2027848A
(en)
1978-08-17
1979-08-15
Pressure-medium activated friction coupling for transmission of torque
Country Status (2)
Country
Link
GB
(1)
GB2027848A
(en)
SE
(1)
SE7808719L
(en)
Cited By (3)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
FR2624936A1
(en)
*
1987-12-22
1989-06-23
Viscodrive Gmbh
VISCO-COUPLER THAT CAN BE CIRCU- NED AND OUT OF CIRCUIT
GB2220046A
(en)
*
1988-06-23
1989-12-28
Joseph Gardner
Torque limiter
EP0843096A1
(en)
*
1996-11-14
1998-05-20
Robert Bosch Gmbh
Coupling device for connecting a fuel pump and a vacuum pump having the same casing
1978
1978-08-17
SE
SE7808719A
patent/SE7808719L/en
unknown
1979
1979-08-15
GB
GB7928451A
patent/GB2027848A/en
not_active
Withdrawn
Cited By (4)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
FR2624936A1
(en)
*
1987-12-22
1989-06-23
Viscodrive Gmbh
VISCO-COUPLER THAT CAN BE CIRCU- NED AND OUT OF CIRCUIT
GB2220046A
(en)
*
1988-06-23
1989-12-28
Joseph Gardner
Torque limiter
GB2220046B
(en)
*
1988-06-23
1992-11-04
Joseph Gardner
Torque limiter
EP0843096A1
(en)
*
1996-11-14
1998-05-20
Robert Bosch Gmbh
Coupling device for connecting a fuel pump and a vacuum pump having the same casing
Also Published As
Publication number
Publication date
SE7808719L
(en)
1980-02-18
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Legal Events
Date
Code
Title
Description
1983-06-15
WAP
Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)
