DE2361847A1 - DEVICE FOR CENTERING RING-SHAPED OBJECTS AROUND A SPINDLE - Google Patents

Description

DR. MÜLLER-BORE DIPL.-PHYS. DR. ^ ANiTZ IHPl.-CHEM. DR. DEU FE L

DlPL.-ING. FINSTERWALD DIPL.-ING. GRÄMKOW PATENT LAWYERS

D 1502

Dec 12, 1973

DUNLOP LIMITED

Dunlop House, RyderStreet, St, Jame§s

London SW II England

Device for centering ring-shaped objects around a spindle

The invention relates to centering devices for annular Objects and in particular for centering such objects on a spindle or another drivable shaft,

In such machines, _s for example, examples wheel balancing machines for wheels dismounted, there is a need for annular articles, ie tires with wheels ₉ both at right angles and centrally to the spindle on which they are to be rotated to the test to arrange _s. In the devices proposed so far, there is a flange

Dr. Manitz Dr. Deufel Dipl.-Ing. Finsterwald Dipl.-Ing. Grömkow

8 Munich 22, Robert-Koch-Straße 1 7 Stuttgart-Bad Cannstatt, MarktstraB

Telephone (0311) 2936 «, Telex 5-22050 mbpat. Telephone (0711) 587261 Bank: Central Cash Office Bayer. Volksbanken. Munich, account number 9822 Post check: Munich 95495

409825/1057

provided, in which to accommodate wheels different • whose size a number of openings are provided that an exact location of the objects, such as the Wheels, ensure that if the wheel is to be bolted to the flange through all the bolt holes in the wheel, what is time consuming.

In addition, it has been found that when using such flanges, the tightening sequence of the bolts is important, since the wrong sequence can lead to the wheel becoming imperfectly centered. It can also be found in some species of wheels will not be able to work properly on the To hold flanges, so that special flanges must be provided, for example with pin-centered Wheels and wheels in which the bolt holes p differ are located from the countersunk holes of conventional wheels.

Another disadvantage of flange interconnects is that for the various wheels that are currently there, a number of flanges must be kept in stock, each of which has a number of sets of holes, and which must be available, with time being lost in determining which flange to use.

The object of the invention is to provide a device when using them, one or more of the disadvantages mentioned above can be reduced or avoided.

A device according to the invention for centering annular objects around a spindle bseitzt a frustoconical part with a bore ₉ which extends coaxially to this, so that the »mentioned part can be arranged on the spindle, and at least two in

A09825 / 1057

equal spaced slots extending axially over at least part of the. Length of mentioned part extending from one end thereof, a link which is coaxial with the frusto-conical part and is intended to hold an annular object placed on said part, and a member for clamping the holding member in the axial direction to the frustoconical part an annular object on the frusto-conical Part against the frustoconical surface of the same to load, so that in use when centering the object with respect to the spindle and as a result of the slots the frustoconical part is compressed radially, ' so that the part mentioned is firmly seated on the spindle.

In one embodiment of the invention, on the Spindle a flange can be provided against which the wider end of the frustoconical part abut can.

In a preferred embodiment of the invention, the frustoconical part can have a cylindrical extension whose bore is a continuation of the bore in the frustoconical part. The approach extends preferably from the narrower end of the mentioned part, the portion of this part, the approach is adjacent, a smaller diameter than the approach can have.

The frustoconical part can either have a straight surface in profile or a surface with a concave one Curvature.

409825/1057

At least one of the links mentioned and preferably • Both can be found on the cylindrical extension and are the mentioned part and the extension on their inner surface is provided with at least one bearing part for storage on the spindle.

If the frustoconical part has a shoulder, The mentioned two slots preferably extend over the axial length of the mentioned part and they can extend into the cylindrical approach.

In the frustoconical part there is preferably a number of strands that are equally spaced from one another intended. The slots may have cylindrical holes at their inner ends that are perpendicular extend to the axis of rotation of the part to create a stress concentration to prevent at the slot ends.

The holding member can be a collar, the exact sliding fit either on the cylindrical attachment or on the spindle Has. The collar is preferably bell-shaped and the enlarged end of this collar has a diameter that is like this is sufficiently dimensioned that it rests on the object radially outside its central bore. The diameter the end can of course be varied depending on the particular object to be centered. Preferably wears that end of the covenant that is intended to rest on an object, a damping ring from a relatively soft material. The ring of damping material is preferably very thin to avoid inaccuracy that when squeezing the ring can occur, to keep it as low as possible. With another form of covenant is a ring with at least two

409825/1057

stretching struts provided, the ends of which bear against an object, the struts preferably have equal distances from one another so that the force exerted on the object is evenly distributed. It can a number of struts can be provided in a substantially bell-shaped arrangement.

The tendon is preferably formed by a nut which is threaded either on the neck of the mentioned part or is engaged on the spindle,

A spacer z _e as a cylindrical collar ₉ may be used between the clamping member and the holding member ₉ so that the path for the tension member as short as possible is held _e When the clamping member is for example a nut, is the tendon the Zahl'der rotations reduced ₉ walche the nut must be communicated to tighten the holding member _o

A combined spacer and tendon can be used formed by a cylindrical sleeve which is threaded at one end is",

The invention is described in more detail below, for example, in conjunction with the accompanying drawing namely show

1 shows a sectional view of a device according to a first embodiment of the invention " ₉ which is suitable for use in a balancing _{machine for wheels removed from the vehicle s} which machine has a spindle on which a tire with rim can be rotatably mounted ₉ and FIG

409825/1057

23618A7

FIG. 2 is a view similar to FIG. 1 of a second Embodiment of the invention.

The device shown in Fig. 1 has a frustoconical part 1 with a cylindrical extension 2, a bell-shaped collar 3 and a nut 4.

The frusto-conical portion 1 and the cylindrical neck 2 is _s provided with a through bore 5 through which a spindle (not shown) of the machine (not shown) can be passed "The bore has two sections, the diameter of which is different from the rest of the bore ₉ which sections form two bearing surfaces 6 and 7 for storage on the spindle ₀ The bearing surfaces 6 and 7 are at a distance from each other »and the. Bearing surface 6 is provided at the wider end of the frustoconical part 1. The frusto-conical part 1 is provided with 8 at equal distances from each other, located slots "The frusto-conical surface 9 in this embodiment has a taper angle of 60 _s although this angle may of course be varied widely depending on the application form dev.

The cylindrical extension 2 is remote from the part 1 End provided with a threaded portion 10 on which one Nut can be screwed on Di @ Nut 4 has a lot * Holes Ha on which lever a »tightening the ter can be used.

The bell-shaped collar 3 has a section 11 and a tapered cylindrical cut 12, which the latter at one end 13 with a

409825/1057

flange 14 extending radially outward is whose, the kbsetonitt 12 Γ turned away from the pool is provided with a damping ring 15 made of rubber.

Between the nut H and the collar 3 is a spacer 16 provided. '·

In use, the frustoconical part 1 and the cylindrical extension 2 slide onto the spindle of the Machine postponed. The tire with rim (not shown) to be balanced is equiaxed and in contact arranged on part 1. The bell-shaped collar 3 is then placed on the shoulder 2 together with the spacer 16 and the nut 4 arranged.

The nut isn't tightened to strain the collar 3, whereby the latter rests against the rim-mounted tire so that it rests on the frustoconical surface 9 part is centered. This centering effect also has the consequence that the part 1 because of the slots 8 radially is compressed so that the bearing surface 6 is firmly seated on the spindle, so that the device through the spindle is rotatable.

After the balancing process has been carried out, the work process is reversed in order to be able to remove the tire mounted on a rim ₀

The advantage of the device according to the invention is that that it is of simple construction, since a single organ centers the object on the frustoconical part, and also secures the latter on the shaft. The device is easy to use in that it is easy to assemble the device and the on a rim

409825/1057

pulled tire can be carried out quickly and easily can. A suitable dimensioning or the use of spacers can be used for centering and securing Zextexn Savings, so that the device according to the invention in its use faster than the aforementioned spacers formed with a flange acts. It can also be part of a single Size can be used for a number of items, e.g. wheels, of different sizes, while the flanged ones Intermediate pieces either a number of holes and / or a number of different flanges are used had to become. Furthermore, the ring-shaped objects are both at right angles and in the middle exactly on the Spindle arranged.

The second embodiment is shown in Fig. 2, in which the same reference numerals are used for those parts of the device which are similar to those in FIG.

In the embodiment according to FIG. 2, the part 1 is provided with a frustoconical surface 9a, which in profile has a concave curvature whose radius of curvature is chosen so that the force exerted by wheels with different Center hole sizes is exerted on the bearing surface 6, in essentially the same. The end 17 of the part 1 adjacent to the cylindrical extension 2 has a smaller one Diameter than the latter and forms a step 18 with the surface 9a.

The end 19 of the part 1, which faces away from the extension 2, has a tapered cylindrical section provided, which forms a hollow section in part 1. The bearing surface 6 is located adjacent the inner end 21 of Part 1. In a modification not shown

409825/1057

the bearing surface 6 can be spaced in a similar position from the end 19 without the hollow portion formed therein.

The surface 14a of the flange 15 is light on the outside axially curved to minimize damage to the wheel from sharp edges.

The slots 8 are each provided with a cylindrical opening 22 at their ends adjacent to the extension 2, which is perpendicular to the bore 5, which openings prevent stress concentration at the ends of the slots.

The operation of this device is similar to that described in connection with FIG. The device according to Fig. 2 is particularly suitable for wheels with a small central opening. When centering wheels with a small Center opening it was found that insufficient grip force on the spindle was developed by surface 6 using the device shown in Fig. 1, The use of a narrow end 17 and / or the openings 22 contributes to the reduction of the openings formed by the slots 8 To make segments more resilient, so that a greater grip force can be developed. In addition, the arrangement of the bearing surface 6. From the end 19 inwards has the effect, that the surface 6 is closer to the point where the grip force acts »

The feature of the concave curvature of the surface 9a enables the centering of wheels with different center hole sizes and that the bearing surface 6 exerts adequate gripping force on the spindle. The radius of curvature of surface 9a is chosen in such a way that essentially, independently of the

409825/1057

central hole size is the force exerted by the surface 6 in the essentially the same.

Instead of using the nut 4 and the spacer 16, as described in connection with FIG. 1, a nut 2 3 (see Fig. 2) can be used. The nut with spacer 23 has a cylindrical sleeve 24 with a threaded portion 25 at the end of 2 6. The threaded section can either be provided at that end of the device turned away from Part 1 if a spacer is required, or vice versa if a spacer is not required. At least two axially extending cylindrical bores 26 are in the sleeve 2 4 provided to the final clamping to enable the nut and spacer 2 3 by a suitable wrench.

Claims;

409825/1057

Claims (1)

Claims; (1. y device for centering ring-shaped objects ^ - ' around a spindle, characterized by a frustoconical part Cl) with a bore C5), which extends coaxially through this so that it can be arranged on the spindle, and at least two of each other in the same way Spaced slots C8) which extend axially over at least part of the length of the part Cl) from one end thereof, an organ C3) which is coaxial with the kegels.tumpfförmigen part Cl) and an annular object on the part Cl ) holds, and a member CH) for loading the holding member C3) in the axial direction with respect to the frustoconical part Cl) to press the annular object on the frustoconical part against its frustoconical surface C9), so that in use when centering the Object with respect to the spindle and because of the slots C8) the frustoconical part Cl) is radially compressed so that the part Cl) one tight en grip on the spindle. 2. Apparatus according to claim 1, characterized in that the frustoconical part has a straight surface in profile (9) has. 409825/1057 3 ,. Device according to claim 1, characterized in that the frustoconical part has a surface (9a) with a concave curvature in profile. 4. Device according to claims 1, 2 or 3, characterized in that that the frustoconical part (1) is provided with a cylindrical projection (2) whose Bore forms a continuation of the bore (5) in the part (1). 5. Apparatus according to claim 4, characterized in that the projection (2) extends from the narrower end of the truncated cone shaped part (1) extends from. 6. Apparatus according to claim 5, characterized in that the diameter of the frustoconical part (1 adjacent the aforementioned approach (2) has a diameter, which is smaller than the diameter of the neck. 7, device according to claims 4, 5 or 6, characterized in that that the holding member (3) and the clamping member (4) can be arranged on the extension (2). 8. Device according to claims 4-7, characterized in that the two slots (8) at least over the axial length of the frustoconical part (1) extend. 409825/105 9. Device according to the preceding claims, characterized in that the frustoconical part (1) is provided with several equally spaced slots (8). 10. Device according to the preceding claims, characterized in that the slots (8) at their inner ends are provided with cylindrical openings (22) perpendicular to the axis of rotation of the frustoconical Part (1) extend. 11. Device according to the preceding claims, characterized characterized in that at least one bearing part (6) is provided on the inner surface of the device. 12, device according to claim 11, characterized in that that the bearing surface (6) is at an axial distance inward from the wider end of the part (1). 13. Device according to the preceding claims, characterized characterized in that the holding member (3) is formed by a collar, the exact sliding fit on the extension (2) the spindle has. 14. The device according to claim 13, characterized in that the collar (3) is bell-shaped and its expanded end 409825/1057 de is in contact with the object to be centered. 15. The apparatus according to claim 13, characterized in that the collar (3) has a ring of which at least two equally spaced struts extend from each other. 16. The apparatus according to claim 15, characterized in that a plurality of struts in a substantially bell-shaped Arrangement extend from the ring. 17. Device according to claims 13-16, characterized in that that that section of the federal government (3), which rests on the object to be centered, with a relatively soft damping material (15) is provided. 18. Device according to the preceding claims, characterized characterized in that the tensioning element ("4) is formed by a nut» with a complementary one Thread (10) on the shoulder (2) or on the spindle can be brought into engagement. 19. Device according to the preceding claims, characterized in that a spacer (16) between the holding element (3) and the clamping element (4 ·) are provided is. 409 825/1057 20. Device according to claims 1-17, characterized in that the clamping member (4) has a cylindrical Has sleeve (24) with a thread (25) at one end (26). 409825/1057 , Jb.