EP1477279A2 - Jaw for spring tensioner - Google Patents

Abstract

The two clamping jaws (7, 8) of the spring tensioning device (1) are of a different shape. The clamping jaw (7) holding the outer end (11) of the telescopic bar (10) is open at the top (17) and attached to the bar (10) with a fork-shaped lower area (5). The clamping jaw (8) positioned adjacent to the spring seat (21) is of a rectangular shape and is also fitted with a fork-shaped lower area (6) with a cranked transitional section between the upper and the lower part. The opening for the insertion of the slightly conical strut is rounded at the lower side, has two concave central sections opposite each other, and a straight edge with rounded corners at the top.

Description

The invention relates to a jaw for a spring tensioner and Spring clamps.

Spring tensioners are used to remove coil springs from automotive shock absorber legs, especially those of the McPherson type and to tension in this way. They come both in manufacturing plants of motor vehicles as well as in repair shops.

A spring tensioner of the usual type has a length-adjustable spindle on which two jaw holders are attached at an axial distance from each other are. The jaw holders are provided with parallel guides in which Let the jaws slide in. The coil spring is over the jaws of the shock absorber leg gripped and tensioned. As a result of Interchangeability of the jaws makes it possible to do one and the same thing Basic device for coil springs with different diameters use. For this purpose, the jaws of the appropriate size are in the parallel guides used.

Spring tensioners of the type described above go from, for example DE 299 17 596 U1 and DE 92 16 148 U1. You have in the Well proven in practice. The jaws are for attaching to a spring turn the coil spring is usually fork-shaped. This embodiment bumps especially with strong springs from large shock absorbers or Shock absorber legs to their limits.

DE 101 09 752 C1 includes a clamping jaw or a gripping element described for a spring tensioner, which is a substantially circular trained support surface has a central passage opening and openings for receiving the protruding from a spring plate Threaded bolts.

There are shock absorber legs with damper tubes that unite along their length have different cross-sectional profiles. The damper tubes point For example, a length section that is conical from the spring plate starting from enlarged in cross section. Also widening gradually Damper tubes are known. There are also versions of shock absorber legs with spring washers facing away from the coil spring Back protruding stop lugs. The stop lugs serve in the motor vehicle for fastening other chassis components.

Based on the prior art, the invention is based on the object a safe and easy to handle for practical use To create a clamping jaw for a spring tensioner for use with spring struts, which is a damper tube with a length of the spring plate starting from increasing diameter. In addition, the jaw should also be suitable for shock absorber legs with spring plates on their Have a projecting stop nose on the back.

According to the invention, this object is achieved in a clamping jaw according to the features of claim 1.

The key point of the invention is the measure that the clamping jaw has a Has jaw body, in which a passage opening for the damper tube A spring strut is provided, which has a lower semicircular section and a widened laterally compared to the semicircular section Has insertion section. The passage opening is configured so that the damper tube of a shock absorber leg through the insertion section in the Jaw body can be passed through or inserted. The cross section of the insertion section is corresponding to the largest diameter of the Damper tube tuned, the contour of the semicircular section to the The diameter of the damper tube on the spring plate is adjusted. The passage opening in the jaw body can basically be open or closed at the top be executed.

To insert the shock absorber leg into a spring tensioner, this is Shock absorber leg with the free end of the damper tube through or into the Passage opening guided until the spring plate rests on the jaw body. Here the damper tube can then be form-fitting with part of its circumference the semicircular section of the passage opening should be inserted where it is safe is held.

The configuration of the passage opening is based on the geometry of the damper tube and the spring plate. One from the spring plate in The stop nose protruding towards the damper tube can pass through or into the Collar through opening. In this context, the Passage opening advantageously above the insertion section approximately rectangularly configured head section, as provided for in protection claim 2. The head section is special for the passage of a stop nose through the Clamping jaw provided.

According to the features of claim 3 protection is the passage opening designed symmetrically with respect to their vertical central transverse plane. She points that way a keyhole-like configuration and is for both left and right right shock absorber legs suitable.

According to the features of claim 4, the jaw body has one cranked area. This measure also contributes to an optimal one Adaptation of the geometry to the configuration of a spring plate.

The cranked area is designed as an inclined section and at least has a recess in a flat side (protection claim 5). The recess primarily contributes to weight optimization and can also be used as Labeling field can be used. Preferably on both flat sides Inclined section, i.e. one in the top and one in the bottom Recess provided.

According to the features of protection claim 6, the jaw has one fork-shaped coupling section with two legs on to Intervention in the jaw holder of a spring tensioner. This measure ensures a reliable mounting of the clamping jaw on the spring tensioner known way and a quick interchangeability. In practice, on Coupling section locking elements provided with corresponding Interlocking elements on the jaw holders interact, to ensure that the jaw is fixed in the jaw holder.

Even if the passage opening in the jaw body is generally upwards can be open is an advantageous further development of the subject matter of the invention to be seen in the features of protection claim 7. After that points the jaw body has a rectangular closed outer contour. This Measure contributes to increased safety during assembly or Dismantling work because the shock leg slips or jumps out from the clamping jaw due to the closed outer contour becomes.

Finally, protection claim 8 aims for a spring tensioner with an inventive Jaw, the rational and safe assembly or Disassembly work on a shock absorber leg allows.

Figur 1

in perspektivischer Darstellungsweise einen Federspanner mit eingelegtem Federdämpferbein;

Figur 2

die Darstellung von Figur 1 in einer Seitenansicht;

Figur 3

die Darstellung von Figur 2 in einer Stirnansicht gemäß dem Pfeil III;

Figur 4

eine erfindungsgemäße Spannbacke in einer Perspektive;

Figur 5

die Spannbacke von Figur 4 in einer Draufsicht und

Figur 6

einen vertikalen Querschnitt durch die Spannbacke der Figur 5 entlang der Linie A-A.

The invention is described below with reference to the drawings. Show it:

Figure 1

a perspective view of a spring tensioner with inserted shock absorber leg;

Figure 2

the representation of Figure 1 in a side view;

Figure 3

the representation of Figure 2 in a front view according to the arrow III;

Figure 4

a jaw according to the invention in a perspective;

Figure 5

the clamping jaw of Figure 4 in a plan view and

Figure 6

a vertical cross section through the jaw of Figure 5 along the line AA.

Figures 1 to 3 show a spring tensioner 1 for tensioning a coil spring 2 of automotive shock absorber legs 3, in particular coil springs of the so-called McPherson type.

The spring tensioner 1 essentially comprises a spindle 4 Actuator, with two jaw holders 5, 6 for putting on Clamping jaws 7, 8 is provided.

The spindle 4 has a first guide element in the form of a guide tube 9 and a second guide element in the form of one in the guide tube 9 relocatable telescopic tube 10. The telescopic tube 10 can Slide the guide tube 9. The outer end 11 of the telescopic tube 10 carries the Clamping jaw holder 5 and the first clamping jaw 7. A groove 12 for an in Guide tube 9 seated key ensures security against rotation between the guide tube 9 and the telescopic tube 10.

To generate the axial adjustment movement in one end 13 of the Guide tube 9, a bearing bush 14 is used, in which one with a The externally threaded spindle rod is supported twice. The spindle rod has an axis extension on which a hexagon 15 rotatably is arranged. By means of the hexagon 15, the spindle rod can be drive. This can be done using an impact wrench or a other suitable turning tool. The external thread of the Spindle rod meshes with an internal thread, which is in a Threaded bushing is located in the telescopic tube 10. This way everyone Rotary movement of the spindle rod in an axial movement of the telescopic tube 10 implemented within the guide tube 9. This axial movement is over the jaw holder 5, 6 transferred to the jaws 7, 8, whereby a Coil spring can be tensioned or relaxed.

16 with a clamping block is also designated on the the jaw holder 5, 6 facing away from the guide tube 9 is fixed. On the Clamping block 16 allows the spring tensioner 1 to be relieved when necessary of the assembly work in a vice.

The two jaws 7 and 8 are designed differently. The Clamping jaw 7 at the end 11 of the telescopic tube 10 is upward in the image plane executed open. It has a U-shaped gripping fork 17, which is spatially curved according to the gradient of a spring turn of the Coil spring 2 is designed. In the jaw holder 5, the jaw 7 used with a fork-shaped coupling section 18.

The other clamping jaw 8 is described in detail with reference to FIGS. 4 to 6. It has a jaw body 19 with a passage opening 20. The Clamping jaw 8 is used for contact with the helical spring 2 on one side limiting spring plate 21 of the shock absorber leg 3. The shock absorber leg 3 has a damper tube 22 with a varying outside diameter Cross-section. A first length section 23 starting from the spring plate 21 a diameter D1 widens over a conical length 24 towards the free end 25 up to the length section 26 with a about the diameter D1 larger diameter D2. This is followed by graded a tube extension 27 of smaller diameter.

The passage opening 20 has an insertion section 28, which is opposite a semicircular section located below the insertion section 28 29 is widened laterally by bulges 30. Through the insertion section 28 of the passage opening 20 becomes the damper tube 22 of the spring damper leg 3 when inserted into the spring tensioner 1 with its free end 25 therethrough out until the spring plate 21 of the shock absorber leg 3 the inside 31 of the Cheek body 19 contacted. The geometry of the semicircular section 29 is open the diameter D1 or the outer circumference of the damper tube 21 in Length section 23 coordinated at the transition to the spring plate 21. The Damper tube 22 can then after the insertion process on the jaw body 19th be placed in the semicircular section 29 where it is form-fitting is held.

It can be seen that the jaw body 19 is a closed rectangular one The outer contour 32 has two which limit the passage opening 20 Side legs 33 and an upper crosspiece 34. The passage opening 20th also has an approximately rectangular shape above the insertion section 28 configured head section 35. This serves in particular for passage one on the rear side 36 of the spring plate 21 in the direction of the clamping jaw 8 protruding stop lug 37 of the spring plate 21st

The passage opening 20 is based on its vertical central transverse plane VME designed symmetrically. Accordingly, the jaw 8 or Spring tensioner 1 for both left and right shock absorber legs 3 one Motor vehicle are used. In particular, the stop lugs 37 on the spring plates 21 once on the left and on the other on the right side of the head portion 35 through the passage opening 20.

The jaw body 19 has a cranked region 38, which acts as an inclined section 39 is formed. Both in the lower flat side 40 and in the upper flat side 41 of the inclined section 39 is a recess 42 or 43 intended. The recesses 42, 43 serve to optimize the weight of the Clamping jaw 8 and can also be used as text fields.

The clamping jaw 8 is positively and non-positively in the known Clamping jaw holder 6 inserted on the guide tube 9. This follows the jaw body 19 a fork-shaped coupling portion 44. This points two side legs 45, 46 with which the clamping jaw 8 in parallel guides of the jaw holder 6 is inserted and locked there. in the Clamping jaw holder 6, the clamping jaw 8 becomes non-positive and positive interlocking locking elements secured. On Locking element 47 is shown as an example in FIGS. 4 and 5 in leg 45 indicated. In practice, locking elements 47 are in shape of spring-loaded bolts which engage in corresponding counter receptacles, proven to be particularly suitable.

REFERENCE NUMBERS

1 -

spring clamps

2 -

coil spring

3 -

Spring damper strut

4 -

spindle

5 -

Holders for clamping jaws

6 -

Holders for clamping jaws

7 -

jaw

8th -

jaw

9 -

guide tube

10 -

Telescoping tube

11 -

End of v. 10

12 -

groove

13 -

End of v. 9

14 -

bearing bush

15 -

hexagon

16 -

clamping block

17 -

cross fork

18 -

coupling portion

19 -

Back body

20 -

Through opening

21 -

spring plate

22 -

damper tube

23 -

Longitudinal section v. 22

24 -

Longitudinal section v. 22

25 -

End of v. 22

26 -

Longitudinal section v. 22

27 -

Tubular extension

28 -

insertion

29 -

Semicircle section

30 -

bulge

31 -

inside

32 -

outer contour

33 -

side leg

34 -

crosspiece

35 -

header

36 -

Back v. 21

37 -

stop lug

38 -

cranked area

39 -

oblique section

40 -

Flat side v. 39

41 -

Flat side v. 39

42 -

recess

43 -

recess

44 -

coupling portion

45 -

leg

46 -

leg

47 -

locking element

D1 -

Diameter of 22

D2 -

Diameter of 22

VME -

vertical central transverse plane

Claims (8)

Clamping jaw for a spring tensioner for tensioning the coil spring of a spring damper leg for contact with a spring plate which delimits the coil spring on one side, characterized in that the clamping jaw (8) has a jaw body (19) with a passage opening (20) for a damper tube of the spring damper leg, the passage opening (20) has a lower semicircular section (29) and one opposite the laterally widened insertion section (28). Clamping jaw according to claim 1, characterized in that an approximately rectangularly configured head section (35) is provided above the insertion section (28). Clamping jaw according to claim 1 or 2, characterized in that the passage opening (20) is designed symmetrically with respect to its vertical central transverse plane (VME). Clamping jaw according to one of claims 1 to 3, characterized in that the jaw body (19) has a cranked region (38). Clamping jaw according to claim 4, characterized in that the cranked region (38) is designed as an inclined section (39) which has a recess (42, 43) at least in one flat side (40, 41). Clamping jaw according to one of claims 1 to 5, characterized in that a fork-shaped coupling section (44) adjoins the jaw body (19) with two legs (45, 46) for engagement in a clamping jaw holder (6) of the spring tensioner. Clamping jaw according to one of claims 1 to 6, characterized in that the jaw body (19) has a rectangular closed outer contour (32). Spring tensioner for tensioning the coil spring of a shock absorber leg with a clamping jaw (8) according to one of claims 1 to 7.

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