DD222410A1 - DEVICE FOR TIGHTENING, IN PARTICULAR BALANCING DEVICES - Google Patents

Abstract

Device for clamping, in particular balancing devices with motor vehicle wheel in vertical or horizontal balancing machines. The aim and task is to balance motor vehicle wheels with high accuracy and without the use of auxiliary power in good working conditions and accident prevention. According to the invention, this is achieved by means of a clamping device arranged in the drive shaft, which is in part designed as a cylindrical hollow shaft. In the hollow shaft is variably fixable a clamping part with walzenfoermigem clamping body, the segment-like clamping profiles with bow-shaped clamping surfaces has arranged. These clamping profiles are each assigned an equal number of clamping elements. By force from the outside, the clamping part is rotated with the clamping body from the relaxation position. The clamping elements lying between the clamping profiles and the hollow shaft inner wall are pressed against the hollow shaft inner wall. The drive shaft undergoes a deformation and biases the balancing device. The tensioning device remains in the tensioning position by self-locking and can only be released from the outside by opposing forces. Fig. 1

Description

G 01 M 1/02

Device for clamping, in particular balancing devices

Field of application of the invention

The field of application of the invention extends to devices for tensioning, in particular balancing devices with motor vehicle wheel in vertical or horizontal balancing machines. As a special field of application are devices into consideration, which can be arranged in the partially formed as a hollow shaft drive shaft.

Characteristic of the known technical solution

The increase in the service life and the high driving speed of the motor vehicles require precise and economical balancing of the vehicle wheels. ,

For this purpose, a vehicle wheel to be balanced is tensioned on a balancing device, for its attachment to the drive shaft of a balancing machine

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, Various clamping devices are known. , From DE-OS 2807 343; DE-OS 2935 216 and DD-PS 143 112 it is known that the tensioning of the balancing devices on the drive shaft by a self-centering - 5-generating device, bei.der one on the drive shaft-displaceable sleeve and a displaceable on the threaded portion of the drive shaft collar are provided on the equipped with handles pivot lever, • on the one hand, two spring-mounted radially movable thread segments and an actuating device and on the other hand with each other. or by means of a clamping unit. tethered and threaded, arranged in a sleeve Domes on which a movable in the axial direction, secured against rotation pressure element associated with one or more engaging in a central bore or in partial circular bores determiners and an acting against the pressure element, threaded clamping element is unscrewed and a Peststell- and a release mechanism are arranged can take place. '.

{) is disadvantageous that due to sum tolerances between motor vehicle wheel, Radaufnahmeflansch or balancing device and drive shaft considerable errors in the concentricity can occur, the negative impact on the balancing quality. '. ken. , , ,

In addition, these known devices material ^ · and labor-intensive in the production. .30 Furthermore, for the purpose of fixing the motor vehicle wheel on the balancing machine is a part of

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known devices in conjunction with the curious on the particular balancing device th Kraftfahrzeugrad.es lift, which demands an additional effort from the operator. The outer and the remaining when placing and removing the vehicle wheel on the clamping devices controls, such as pivot lever, lever nut udgl. have a negative impact on occupational health and safety, as the risk of injury is relatively high.

These visible tensioning devices also do not meet the aesthetic demands of industrial design

 Due to these disadvantages is therefore known from DE-OS 28 13387 to arrange a drawbar in a designed as a hollow shaft drive shaft of the balancing machine.

One end of the pull rod is fixed to the piston of a pneumatic piston-cylinder unit, while the other part of the pull rod projecting into the free end of the hollow shaft is equipped with means for fastening the wheel rim of the motor vehicle wheel to the balancing machine

 Said fastening means consist of at least a pair of symmetrically arranged along the longitudinal axis of the tie rod mutually rotatable teeth or pawls which are pivotally and resiliently mounted on the prongs of a fork and engage in two located at the end portion of the hollow drive shaft, opposite longitudinal slots.

, The attachment means may also consist of a _cone: dull consist of the with its large base on the projecting end. Balancing shaft is seated and secured to the free end of the drawbar and that the free end of the balancing shaft is radially expandable by a number of radially equidistant _Längsschlitzen »

Clamping is carried out partly manually and partly pneumatically.

The salient parts of the invention are that

-. by Mitt'enversatz the bore of the drive shaft

In the operating state, concentricity inaccuracies can occur which lead to errors in the imbalance display. ,

- in case of contamination, leakage udgl. the pneumatic piston cylinder unit of the working cylinder. an uncontrollable, reduced power brings, so that the reduced contact pressure prevents accurate centering of the vehicle wheels in the balancing device or that this leads during operation to an unwanted release of the clamping device. .

- In this proposed solution by the operator an additional force is applied, as well as a part of the clamping device must be lifted, mounted and removed.

- Furthermore, the risk of injury by the over the vehicle wheel projecting drawbar not exclude is

 - Additional power is needed.

Furthermore, a concealed in the drive shaft means for tensioning balancing devices is known in which by means of a on an axially conical cavity of the drive shaft accommodated arrangement of clamping elements, needles or balls acting pressure piece deformation of the drive shaft is caused in a limited clamping range and the balancing device is tensioned with motor vehicle wheel.

Object of the invention

It is an object of the invention to achieve that the device for tensioning a balancing device with low production costs and good working conditions for the operator, a balancing of

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Motor vehicle wheels with high accuracy guaranteed without the use of auxiliary power.

Explanation of the essence of the invention

The disadvantages described in the characteristic of the known technical solution can be traced back to design-related defect and manufacturing errors in the said clamping devices and puncture disturbances of the pneumatic piston-cylinder unit

 To eliminate these causes, the invention has for its object to find a clamping device, which is arranged in a concealed design in the balancing machine permanently and can be used without auxiliary power.

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According to the invention this is achieved in that on a drive shaft of a balancing machine, in particular motor vehicle wheels, which are mounted on balancing devices, are tensioned by means of a concealed arranged in the drive shaft clamping device. '

For this purpose, the free end of the drive shaft is designed as a cylindrical hollow shaft. In the hollow shaft is variably fixable a clamping member arranged with a roll-shaped clamping body, the segment-like clamping profiles has, whose clamping surfaces are arcuate. , , These clamping profiles are each assigned an equal number of clamping elements, which lie in the relaxed state between the clamping profiles and the hollow shaft inner wall. ~ By force from the outside, the clamping part with the roller-shaped clamping body from der'Entspan-. turned low. The clamping elements lying between the clamping profiles and the hollow shaft inner wall are printed by the arcuate clamping surfaces of the clamping profiles to the inner wall of the drive shaft designed as a hollow shaft

 As a result, the drive shaft undergoes a corresponding Deformieruhg and the balancing device is tensioned on the balancing machine.

'The clamping device remains by self-locking in. The tension position. ,

Only by opposing force from the outside can be carried out a release of the balancing device of the balancing machine.

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embodiment

The invention is based on a in the drawing. illustrated embodiment will be explained in more detail.

1 representation of a tensioned on the drive shaft by means of a tensioning device according to the invention balancing device

Pig 2 representation of a Spannein- invention. Direction mit.ladein as clamping elements

After Pig 1 are on a drive shaft of a balancer 1 motor vehicle wheels or disc-shaped body, which are mounted on a balancing device 2, tensioned by means of a clamping device according to the invention. '.

In the free end of the drive shaft 1 is axially a cylindrical cavity 3, in which the clamping device is variably fixable.

The clamping device consists essentially of a clamping part 4 »a cylindrical clamping body 5 with segment-like clamping profiles having arcuate clamping surfaces and clamping elements 6, which may be, for example, needles or balls. - Each segmental clamping profile is assigned at least one clamping element 6.

The clamping elements 6 are arranged between the arcuate clamping surface of the segment-like clamping profiles and the inner wall of the partially ausgebilde-, th drive shaft 1 as a hollow shaft.

By force from the outside, the clamping part 4 is tightened and the roller-shaped clamping body 5 is rotated from the relaxation position, so that the lying between the clamping profiles and the hollow shaft inner needle-shaped clamping elements 6 are pressed by the arcuate clamping surfaces, the segment-like clamping profiles to the inner wall of the drive shaft 1. As a result, the drive shaft 1 undergoes a corresponding deformation, so that the balancing device 2 with

TO the motor vehicle wheel on the balancing machine. · Is tensioned · '

The clamping device remains by self-clamping in the tensioned position. A release is after the balancing process only by an opposite force, acting on the clamping part 4 possible.

A lock 7 closes the hollow shaft part on the end face of the drive shaft 1 so that even if improper. Operation is excluded falling out of the clamping device in the released state.

The advantages of the invention lie in the fact that / . ".... * '-' ...

'- A minimal time and material cost for the manufacture, position of the clamping device is required.

- Additional units for auxiliary power-25. lost because no auxiliary power is required for clamping ¹ voltage.

- The clamping paths are very small. the tensioning device is concealed in the part of the drive shaft 1 to be formed as a hollow shaft, characterized

• No additional imbalance caused by circulating components

  · There is a positive influence on the shape of the balancing machine

• accident sources due to protruding and outwardly arranged clamping elements are excluded [...] the clamping device can be used for all balancing

find directions and thus always remain in the balancing machine, so that a considerable amount of work for the operator is achieved because the clamping device does not have to be raised with the balancing machine or removed from this. , a uniform centric voltage of the balancing device is given

, is due to the extremely small size of the clamping device, the mass-performance ratio very low.

Claims (1)

• ^{(Erfindüngsanspruch.} .. ^{. 1. Device for clamping, in particular balancing devices, in a partially formed as a hollow shaft drive shaft of a Auswuchtma- ·. - 5 machine is arranged and find ¬ when'the clamping element used as washers or balls, g e k e η η characterized in that in the formed as a cylindrical hollow shaft part of the ( \ '· Drive shaft (1) variably fixable a clamping part .10 (4) with roller-shaped clamping body (5)> which has a number of segment-like self-locking clamping profiles with arcuate clamping surfaces and in each case an equal number of tension profiles arranged, between these and the hollow shaft inner wall lying chip elements (6) are arranged. A sowing,