DEVICE FOR AXIALLY AND TANGENTIALLY CLAMPING AN OBJECT ON A SHAFT

Abstract: A device for axial and tangential clamping of an object (12) on a shaft (19) comprises a slit inner sleeve (2) adapted to be mounted on the shaft and having a conical portion (4); and outer sleeve (5) having a conical portion (6) cooperating with the conical portion of the inner sleeve; and locking members (7, 13) for displacing the sleeves relative to one another and thus allowing axial and tangential clamping of the sleeves on the shaft. The inner sleeve (2) has an axial, cylindrical portion (15), next to the conical portion, to receive a stop member (8) which can be axially locked at least in a direction away from the conical portion (4) of the inner sleeve and to which cylindrical portion the object (12), which is to be clamped, is connected. The locking members (7, 13) are adapted to press directly and/or via the object against the stop member such that the object is clamped axially and tangentially on the inner sleeve and simultaneously, by means of a momental force, to clamp the sleeves, as mentioned above.

Description: DEVICE FOR AXIALLY AND TANGENTIALLY CLAMPING AN OBJECT ON A SHAFT - . .The invention relates to a device for axially and tangentially clamping an object on a shaft, said device comprising a slit inner sleeve adapted to be mounted on ' the shaft and having a conical portion; an outer sleeve having a conical portion cooperating with the conical portion of the inner sleeve; and locking members for displacing the sleeves relative to one another and thus allowing axial and tangential clamping of the sleeves on the shaft. The invention aims at providing a device for clamp¬ ing, on a shaft, an object of varying thickness and material, for example a chain wheel, belt pulley, gear wheel, or cam disk, such that the object is clamped by friction both axially and non-rotatably on the shaft. Furthermore, the invention aims at providing a device of the type mentioned by way of introduction, combined with a sliding coupling. According to the invention, this is achieved by means of a device of the type mentioned by way of intro- duction, and having the characteristic features stated in the appended claims. The invention will be described in detail below, reference being made to the accompanying drawings illu¬ strating four embodiments. Fig. 1 is a lateral view, partly in section, of a first embodiment of the device according to the in¬ vention, an object being mounted on the device. Fig. 2 is a front view of a second embodiment of the device according to the invention. Fig. 3 is a lateral view, partly in section, of the device shown in Fig. 2, an object being mounted on the device. Fig. 4 is a first embodiment of a sliding coupling included in the device according to the invention. Fig. 5 is a second embodiment of a sliding coupling. Fig. 6 is a part section along line VI-VI in Fig. 5. - . -, Fig. 7 is a modification of the embodiment in Fig. 1. " Fig. 1 shows a device 1 according to a first embodi¬ ment of the invention. The device comprises an inner sleeve 2 having a cylindrical portion 15 to support an object 12 which is to be clamped, and a conical portion 4 cooperating with an outer sleeve 5. The cy¬ lindrical portion 15 serves to centre and hold the object. on a shaft 19, while the conical portion which is formed with one or more slots 3 (only one slot shown) , serves to clamp the inner sleeve on the shaft 19 by cooperation with the outer sleeve 5. The outer sleeve 5 has a conical portion 6 cooperating with the conical portion 4 of the inner sleeve 2 and a number of threaded, axial bores distributed circumferentially on the sleeve for holding clamping screws 7. Clamping the object 12 on the shaft 19 is done in the following manner. First, a clamping washer 13 is mounted on the cylindrical portion 15 of the inner sleeve 2. Then the object 12 and a counter-washer 8 are mounted on this cylindrical portion, the object being placed between the clamping washer 13 and the counter-washer 8. The counter-washer 8 and the inner sleeve 2 each have an annular groove 9 and 10, respec¬ tively, for holding a one-part or two-part lock ring 11. The clamping screws 7, when tightened, press the object 12 against the counter-washer 8 which is axially locked by means of the lock ring 11 in that the outer sleeve 5 tries to "climb" the conical portion 4 of the inner sleeve. Since this conical portion is pro- vided with a slot 3, it is radially compressed and clamped on the shaft 19. This clamping is achieved by means of a force, the moment arm of which is extending IjU EAϋ OMPI sΛ ™ p ° . between the clamping washer 13 and the conical portion 4 of the inner sleeve. The axially directed force exerted by each clamping screw 7 on the clamping washer 13 effects tangential clamping of the object 12, that 5 is-.to say the object is non-rotatably mounted on the device 1. A great advantage of this arrangement is that the object 12 may be set in the correct axial position before clamping by means of the clamping screws 7. The clamping washer 13 has openings for receiving 0 the clamping screws 7. Fig. 2 shows a second embodiment ofthe invention, having great resemblance to the first embodiment, but here also the outer sleeve is formed with a slot 20. Like reference numerals apply to similar parts in Fig. 5 1. Fig. 3 shows a lateral view of the device in Fig. 2, an object 17 being centred on the outer sleeve 5 having a cylindrical, outer surface 16. The object has , in this case, an annular shoulder 18 engaging ° with the counter-washer 8. In this embodiment, the cylindrical portion 15 of the inner sleeve has been made shorter, and there is no clamping washer 13. The shoulder 18 may be replaced by an annular groove in the object 17 and a lock ring inserted in the groove. 5 Clamping the object 17 is done in the following manner. hen the clamping screws 7 press the counter- washer 8 against the lock ring 11, the outer sleeve 5 tries to "climb" the conical portion 4 of the inner sleeve and, by means of the above-mentioned mo ental force, to press the conical portion of the inner sleeve against the shaft. Both the outer sleeve and the inner sleeve having slots 20 and 3, respectively, the outer sleeve will be slightly displaced radially outwardly towards the object. The outer sleeve will therefore engage with the object 17, and since the outer sleeve is displaced to some extent also in the axial direction, the outer sleeve will, by means of friction engagement. ... OMPΪ Λ IPO press, via the shoulder 18, the object against the counter-washer 8. In this manner, both axial and tan¬ gential clamping of the object 17 is achieved. The embodiment in Fig. 4 corresponds to the embodiment in i ig. 1, although a sliding coupling has been added to allow the object to be rotated relatively to the shaft, when a given tangential force on the object is " exceeded. The sliding coupling consists of friction linings 24 and 25 on the counter-washer 8 and on a washer 30, respectively. A counter-sleeve is slidable on the cylindrical portion 15 of the inner sleeve, and a cylindrical portion 22 of the counter-sleeve is adapted to engage with the counterrwasher via a jaw clutch 33 such that the counter-sleeve, when sliding, is not taken along by the object. The jaw clutch comprises a number of projections formed on the counter-washer and engaging with corresponding recesses in the end of the cylindrical portion 22 of the counter-sleeve. A radial flange 23 on the counter-sleeve has a number of through holes in its circumference for receiving a spring assembly 27 as described below and, between these holes, borings for receiving the clamping screws 7. The inner sleeve is clamped on the shaft in the same manner as before, by tightening the clamping screws, allowing the cylindrical flange on the counter-sleeve to engage with the counter-washer 8 to build up the above mentioned momental force. In this embodiment, the cylindrical portion 22 holds the object. Between the clamping screws on the outer sleeve threaded through borings are provided, each adapted to receive a bias sleeve 26 operable from the side of the outer sleeve facing away from the object 12. The friction lining 25 is mounted on a washer 30 and a spring assembly is clamped between each bias sleeve 26 and the washer via the corresponding through holes in the radial flange 23 of the counter-sleeve. In this embodiment, each spring assembly consists of a number O PI of cup springs connected in series on a positioning pin 31, one end of which is slidable in the bias sleeve, while the other end is mounted in a hole in the washer. Other types of spring arrangements are possible, e.g. hel.ical springs. Tightening the clamping screws 7 will result in a clamping of the inner and outer sleeves 2, 5 on the shaft, and rotating the bias sleeve 26 will result in a predetermined locking of the object between the friction linings 24, 25. Fig. 5 shows another type of sliding coupling which does not have the washer, the bias sleeve and the spring assembly but, instead, annular grooves 29 formed oppo¬ site one another in the stop member 8 and the radial flange 23 on the counter-sleeve, respectively. Sinusoidal leaf springs 28 are clamped in the grooves between the bottom of the groove and the respective friction lining. In this embodiment, the clamping screws engage directly with the radial flange 23 on the counter-sleeve. This embodiment is intended for minor objects and, thus, minor forces. Fig. 6 shows the position of one spring 28 in its groove 29, the spring being provided, at its points of contact with the rear side of the friction lining 24, with pins 32 which engage with the corresponding recesses in the friction lining for locking it to the stop member 8. Also other types of locking between the friction lining and the leaf springs may be used. Fig. 7 shows a device for front mounting on a shaft end. Compared to Fig. 1, the stop member 8 is made in one piece with the cylindrical portion 15 of the inner sleeve. The conical portion of the inner sleeve consists of a separate ring 34, mounted on the slit part of the sleeve and having a conical outer surface, cooperating with the conical surface of the outer sleeve 5 when the sleeves are clamped on the shaft and the object is locked on the cylindrical portion of the inner sleeve. The lock ring 11 is placed on the slit part of the inner sleeve and is easily accessible from the shaft end. In this manner, it is possible, without removal of the inner sleeve, to exchange the outer sleeve, the conical ring 34, the clamping washer 13 and- the object 12, after the lock ring has been removed from the inner sleeve. To release the connection between the conical ring 34 and the outer sleeve 5, use is made of a dismounting device consisting of at least two diametical holes (not shown) in the outer sleeve, corresponding to threaded holes in the clamping washer 13, and screws insertable in these holes. When these screws are screwed into the threaded.holes via the holes 'in the outer sleeve, the outer .sleeve is drawn against the object and disengaged from the conical ring 34 which after removal of the lock ring 11 can easily be taken off.

Claims: CLAIMS 1. Device for axially and tangentially clamping an object (12; 17) on a shaft (19), said device com¬ prising a slit inner sleeve (2) adapted bo be mounted on the shaft and having a conical portion (4, 34) ; an outer sleeve (5) having a conical portion (6) co¬ operating with the conical portion of the inner- sleeve; and locking members (7, 13; 7, 8; 7, 22-27; 7, 22-25, 28, 29) for displacing the sleeves relative to one another and thus allowing axial and tangential clamping of the sleeves on the shaft, c h a r a c t e r i s e d in that the inner sleeve (2) has an axial, cylindrical portion (15), next to the conical portion, to receive a stop member (8) which can be axially locked at least in a direction away from the conical portion (4) of the inner sleeve, and to which cylindrical portion (15) the object (12; 17) to be clamped is connected; and that the locking members (7, 13; 7, 8; 7, 22-27; 7, 22-25, 28, 29) are adapted to press directly and/or via the object against the stop member for axially and tangentially clamping the object on the inner sleeve and for simultaneously providing, by means of a momental force, the said clamping of the sleeves. 2. Device as claimed in claim 1, c h a r a c ¬ t e r i s e d in that the locking members comprise a number of axially directed clamping screws (7) in the outer sleeve (5) . 3. Device as claimed in claim 2, c h a r a c ¬ t e r i s e d by a clamping washer (13) , slidable on the cylindrical portion (15) of the inner sleeve (2) and adapted, upon tightening of the clamping screws, to be displaced against and lock the object (12) against the stop member (8) . 4. Device as claimed in claim 2, c h a r a c ¬ t e r i s e d in that also the outer sleeve (5) is formed with a slot (20) and has a cylindrical portion (16) which is adapted to support the object (17) and, upon relative displacement of the sleeves- (2, 5) for axially and tangentially clamping the object, to actuate the " object by means of an axially directed momental force, an annular shoulder (18) on the object being pressed against the side of the stop member (8) facing away from the outer sleeve. 5. Device as claimed in claim 2, c h a r a c - t e r i s e d in that the locking members further comprise a counter-sleeve having an axial, cylindrical flange (22) slidable on the cylindrical portion (15) of the- inner sleeve (2) for engagement with the stop member (8) , and having a radial flange (23) ; friction linings (24,25) arranged on either side of the object (12) ; and spring-loading means (26, 27; 28) adapted to be biased by the outer sleeve and further adapted, upon tightening of the clamping screws (7) , to cause tangentially locking which allows sliding when a given tangential force on the object is exceeded; and that the clamping screws are adapted to engage with the radial flange and to press the counter-sleeve against the stop member (8) to build up said momental force. 6. Device as claimed in claim 5, c h a r a c - t e r i s e d in that the spring-loading means comprise at least one bias sleeve (26) axially slidable in the outer sleeve, and a spring assembly (27) insertable between one friction lining (25) and the bias sleeve and extending through the radial flange (23) on the bias sleeve, the bias of the spring-loading means being controlled by means of the bias sleeve. 7. Device as claimed in claim 5, c h a r a c t e r ¬ i s e in that the spring-loading means comprise sinus¬ oidal leaf springs (28) each clamped in an annular groove (29) in the stop member (8) and in the radial flange (23) of the counter-sleeve, respectively, between the respect¬ ive friction lining (24, 25) and the stop member/flange.

Inventors: GACIA TADEUSZ, GACIA, TADEUSZ
Applicants: GACIA TADEUSZ, GACIA, TADEUSZ
Application year: 1984
Main classification: F16D1
IPC codes: F16D1