DE8019528U1 - CLAMPING DEVICE FOR MOTOR VEHICLE WHEELS - Google Patents

Description

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LEINE & KING

PATENT LAWYERS

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Dipl.-Ing. Sigurd Leine · Dipl.-Phys. Dr. Norbert König

Burckhardtstrasse 1 Telephone (0511) 62 30Oi

D-3000 Hannover 1

Our sign date

Horst Warkotsch 187/10 July 17, 1980

Clamping device for motor vehicle wheels

The innovation relates to a jig of the im The generic term of claim 1 referred to in Art.

DE-AS 27 01 534 is a jig of the type in question is known in which the compression spring is formed from a tubular part formed on the first contact flange and is surrounded by an axially displaceable, inserted cover hood, against the inner bottom surface of one end of the Compression spring and the outer bottom surface of which the centering cone rests. This cover is intended to protect the spring against dirt and also to provide a preload in conjunction with a stop the spring can be achieved. In practice, however, the protection of the helical spring is of no importance, since the spring is not affected by dirt. If it occurs, however, there is a risk of the covering hood jamming in the tubular one Part that is arranged on the contact flange. A particular disadvantage, however, is the fact that the compression spring is radially unguided.

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The object of the innovation is to avoid the disadvantages of the known jig, that is to say in the case of the In particular, jamming due to dirt cannot occur 'and also sufficient radial guidance of the compression spring is guaranteed.

The object on which the innovation is based is achieved in that the end of the compression spring facing the dsm centering cone is clamped radially with a cylindrical surface of a guide part, which is held displaceably on the clamping shaft.

In this solution, the end of the compression spring is guided very precisely radially so that it does not jam and thus the functionality the centering can affect. In addition, by jamming the end of the compression spring with the No additional effort associated with guide part, so that the construction is particularly simple and cheap. The leadership part can also be removed at any time in a known manner by turning it a little in the screwing direction and pulling it off the diameter of the compression spring is slightly reduced and the jamming loosens. Because of this removability The guide surfaces of the guide part and the spring can be cleaned at any time and the device can be used when centering from the outside.

An expedient embodiment of the jamming consists in that the end of the compression spring facing the centering cone is helical and in the relaxed state has a diameter that is slightly larger than a cylindrical inner wall of the guide part is, and that the end facing the centering cone

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the compression spring is stuck on the cylindrical inner wall.

It is useful here that the cylindrical inner wall extends approximately over a screw thread of the helical one "The compression spring extends. This allows the outer part of the coil spring to move freely.

A particularly useful development of the innovation is that the diameter of the clamping shaft in the area the end of a helical or spiral compression spring facing away from the centering cone is somewhat larger in the relaxed state than the inner diameter of this adjacent end of the helical or spiral compression spring which is so clamped. In this way, the rear end of the helical spring is also firmly seated, so that both the compression spring and the guide part are captive, but kept easily removable. It is of particular advantage that there are no stops as required with the known jig, which reduce the stroke of the centering cone.

The innovation will be explained in more detail below on the basis of an exemplary embodiment shown in the drawing.

In the exemplary embodiment, the contact flange that rests against the rim of a motor vehicle wheel to be clamped is from the outside and the associated clamping nut not shown. Said outer abutment flange is on a threaded end 1 a Clamping shaft 2 pushed on while the clamping screw is on

f thread 3 of thread end 1 is screwed on. The clamping

shaft 2 is in a known manner on the shaft end of a balancing machine attached and has a first or inner

Contact flange 4 on which the inner bit of the rim of a to be clamped vehicle wheel comes to the plant.

For the purpose of centering during clamping, a centering cone is axially displaceable on the clamping shaft 2 5 held against which an outer end 6 of a helical compression spring 7 presses, the inner end 8 of which is open a surface 9 is supported.

The outer end 6 of the compression spring 7 is inserted in a guide part 10 and has a diameter that is slightly larger than is an inner cylindrical surface 11 of the guide part 10, so that the end 6 of the compression spring 7 is frictionally engaged with the guide part 10 is connected.

The guide part 10 slides with a bore 12 on the Clamping shaft 2, so that thereby also the compression spring 7 with her End 6 is guided and can therefore not tilt.

The inner end 8 of the compression spring 7 has an inner diameter in the relaxed state that is slightly smaller than that Outside diameter of a thickening 13 of the clamping shaft 2 its foot is so that the end 8 of the compression spring 7 is held in a clamping and force-locking manner on the Aufspannwelie 2 releasably. In order to guide part 10 and compression spring 7 are easily detachable and precisely guided without any special additional structural measures held.

Claims (4)

Protection claims: 1. Clamping device for motor vehicle wheels with different large center hole on a clamping shaft attached to the shaft end of a balancing machine, with a first contact flange as an abutment for the inside of the rim, with a second contact flange that is axially displaceable on the clamping shaft as an abutment for the outside of the rim, with a clamping nut that can be screwed onto a threaded end of the clamping shaft, by means of which the shaft can be clamped between the contact flanges, with one that is slidable on the clamping shaft towards the clamping shaft end tapering, exchangeable centering cone, and with one arranged behind the centering cone Compression spring which pushes the centering cone into the center hole of the rim of the motor vehicle wheel from the inside when a motor vehicle wheel is clamped presses and centers it, characterized in that the centering cone (5) facing The end (6) of the compression spring (7) is clamped radially to a cylindrical surface (11) of a guide part (10) which SL / K -2- • · · t »I • tit III Ij -2- is held displaceably on the clamping shaft (2). 2. Clamping device according to claim 1, characterized in that that the centering cone (5) facing end (6) of the compression spring (7) is helical and in the relaxed state has a diameter which is slightly larger than a cylindrical inner wall (11) of the guide part (10), and that the end (6) of the compression spring (7) facing the centering cone (5) clamps on the cylindrical inner wall (11). 3. Clamping device according to claim 2, characterized in that that the cylindrical inner wall (11) about a screw thread of the helical compression spring (7) extends. 4. Clamping device according to claim 1, characterized in that that the diameter of the clamping shaft (2) in the area of the end (8) facing away from the centering cone (5) a helical or spiral compression spring (7) in the relaxed Condition slightly larger than the inner diameter of this adjacent end (8) of the helical or spiral compression spring (7) that is held so clamped.