KR20070018695A - Torsion vibration damping device or decoupling device for a driving disc, having a torsion spring mounted in a hollow shaft - Google Patents

Abstract

Separating device for the drive disk 20 connected with the drive shaft 13 through the torsion spring 31 for torque transmission, the end of the drive shaft 13 is formed as a hollow shaft 12, the torsion spring 31 Is a bar-shaped bearing sleeve which is fixedly rotatably fixed to one end of the drive shaft 13 and the other end of the drive disk 20, and freely rotatable facing the free end of the hollow shaft 12. 21 is firmly coupled to the drive disk 20.

Drive disc, torsion vibration damper, bearing sleeve, hex bar, torsion spring

Description

Torsion Vibration Damping Device or Separation Device for Drive Disk with Torsion Spring Mounted in Hollow Shaft

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a partial sectional view showing a torsional vibration damping device in a first embodiment in equidistant projection.

FIG. 2 is an exploded view showing the torsional vibration damping device according to FIG. 1 (FIG. 9).

3 shows an individual part of the torsional vibration damping device according to FIGS. 1 and 2 (FIG. 8).

Fig. 4 is a partial sectional view showing the torsional vibration damping device in the second embodiment by equidistant projection.

FIG. 5 is an exploded view showing the torsional vibration damping device according to FIG. 4; FIG.

Figure 6 shows the individual parts of the torsional vibration damping device according to figures 4 and 5;

Fig. 7 is a partial sectional view showing the torsional vibration damping device in a third embodiment by equidistant projection.

8 is an exploded view showing the torsional vibration damping device according to FIG. 7;

Fig. 9 shows the individual parts of the torsional vibration damping device according to Figs. 7 and 8;

Fig. 10 is a partial sectional view showing the torsional vibration damping device in a fourth embodiment by equidistant projection.

FIG. 11 is an exploded view showing the torsional vibration damping device according to FIG. 4; FIG.

Figure 12 shows an individual part of the torsional vibration damping device according to figures 4 and 5;

In all figures the parts are shown cut approximately 90 ° of the circumference.

<Explanation of symbols for the main parts of the drawings>

11: torsional vibration damping device

12: hollow room

13: drive shaft

14: fixed area

15: hollow room

16: form-coupled means

17: bearing sleeve

18: bearing area

19: friction bearing bush

20: drive disk

21: bearing sleeve

22: belt pulley

23: hub

24: form-coupled means

25: bearing face (18)

26: bearing face 21

27: outer thread

28: inner thread

29: bearing face 18 '

30: bearing face 21 '

31: torsion spring

32: hexagon bar

33: flange

34: flange

35: end

36: end

37: hex socket

38: torsion spring

39: end

40: end

41: buffer mass

42: hexagon socket opening

The present invention relates to a torsional vibration damping device or separation device for a drive disk, which is coupled with a drive shaft via spring- and damping elements for the purpose of torque transmission. The drive may be executed from the drive disc to the drive shaft or from the drive shaft to the drive disc. The drive shaft can be, for example, a crank shaft or a cam shaft of an internal combustion engine, and the auxiliary drive can be driven via the drive disk. Due to the periodic mode of operation of the internal combustion engine or, for example, the piston compressor, irregularities appear at the shaft ends that can be amplified through vibration- and resonance phenomena of the shaft, with respect to angular speed and torque. In order to damp this irregularity in the drive which affects the auxiliary drive, springs and damping elements often consist of a damping element and an elastomer combined with a spring effect in one part. Elastomers as materials of spring- and damping elements include a number of disadvantages.

The strength and natural frequency of the element through it is highly dependent on the ambient temperature, which can adversely affect the damping effect.

The material of the elements is subject to aging. The material hardens over time, which can result in a poor damping effect.

Elastomers are sensitive to the surrounding environment, in particular with respect to coarse liquids or oils and gases present in internal combustion engines.

Damping properties are elastomer-dependent and can only change to a limited extent.

Spring- and damping elements composed of elastomers require a relatively large space.

It is therefore an object of the present invention to propose a separation device which comprises a spring- and damping characteristic which is simply designed, continuously good and freely selectable, for a component consisting of a drive disc and a drive shaft.

The solution to this can be achieved by providing a separation device for the drive disk coupled with the drive shaft through the torsion spring for torque transmission, wherein the end of the drive shaft is formed as a hollow shaft, the torsion spring is in the form of a bar And is rotatably fixed with the end of the drive shaft and the other end of the drive disc, and is supported to be freely rotatable about the free end of the hollow shaft.

By using a bar-shaped torsion spring in the hollow shaft, a very simple design is realized which combines the effects of the spring and the damping device into one part. Torsion springs made of metal guarantee a long life regardless of temperature and other ambient influences. The number of parts is small, which makes assembly cheap. The material of the spring- and damper unit ensures high damping performance and good heat dissipation.

In a preferred embodiment, the torsion spring may consist of a bar bundle of individual bars, in particular hexagonal bars.

At this time, the torsion of the spring causes relative frictional motion between the individual bars of the bar bundle, thereby increasing the damping effect.

Alternatively, the torsion spring may be provided as a solid part and may be provided as a solid bar or a hollow bar. It is also proposed that the torsion spring in particular comprise a central portion and a polygonal end region with a circular cross section. In this case, the damping effect occurs in the form of internal damping at the bar cross section.

In the two embodiments mentioned above, in a preferred manner, the spring is fixed formally in relation to the direction of rotation, on the one hand in the drive shaft and on the other in the drive disk.

In an advantageous embodiment, a bearing sleeve supported and interacting with the bearing sleeve of the drive disk is fixed on the drive shaft, in particular in the area of the hollow shaft, and any bending force can be accommodated under conditions of free rotation possibility. According to a first alternative, it is proposed that the bearing area of the bearing sleeve surrounds the outside of the inner bearing sleeve of the drive disk. According to another alternative, it is proposed that the bearing area of the bearing sleeve is located inside the outer bearing sleeve of the drive disk.

Preferably, a friction bearing bush is additionally provided between the bearing means, in particular the bearing sleeve on the drive shaft and the bearing sleeve on the drive disc. The use of needle bearings is also not ruled out. It is a matter of choice in which of the two bearing sleeves the bearing means is fixed. An axial fixation means can be provided between the bearing sleeve and the bearing disc. While the relative possibility of rotation between the two parts is guaranteed relative to each other, it ensures that the drive disk does not escape on the bearing sleeve. An axial fixation means of this type can be provided via a redundant ring, retaining ring or the like.

The bearing sleeve on the drive shaft can be inserted along the thread on a fixed area in the hollow shaft area of the drive shaft. Fixation via press fitting is also possible.

Preferred embodiments of the invention are shown in the drawings and are described in detail below.

1 shows a torsional vibration damping device 11 according to the invention, coupled with the end of a drive shaft 13. The drive shaft 13 is actually shown as an expanded diameter part in the form of a flange which is formed integrally with the drive shaft, for example the crankshaft. The free end of the drive shaft 13 is in the form of a hollow shaft 12, and formally coupled means 16 are provided at the inner end of the inner hollow chamber 15 as hexagon sockets. The bearing sleeve 17 is rotatably inserted along the thread onto the fixed area 14 of the drive shaft 13, the inclination of the thread being selected such that the screw is tightened in operation with respect to the direction of rotation of the drive shaft 13. do. The bearing sleeve 17 can be fixed on the fixed area 14 by press fitting or other suitable method. The expanded bearing area 18 of the bearing sleeve 17 receives a friction bearing bush 19 in which the drive disk 20 is rotatably supported via an attached bearing sleeve 21. The bearing area 18 is limited by the flange 33 after the drive disc. The bearing region 18 and the drive disk 20 can be fixed in relation to each other in the axial direction by means not shown here in detail. The belt pulley 22 for the flat belt can be identified on the outer gear of the drive disk 20. Instead of such belt pulleys for flat belts, belt pulleys for V-belts, toothed belts or chain gears may be provided. The drive disk 20 also comprises a hub 23 with form-coupled means 24 formed as a hexagonal socket. The torsion spring 31 is inserted into the hollow shaft 12. It consists of a number of individual hexagonal bars, which in total are engaged by the front end 35 into the formally coupled means 16 of the inner end of the hollow chamber 15 of the hollow shaft 12, on the other hand the rear end 36. Is inserted into the hollow shaft 12 by means of which the torsion spring 31, which engages into the form-coupled means 24 of the drive disk 20. By this means, the drive disc 20 is rotatably supported on the one hand in a low friction manner with respect to the bearing sleeve 17 and on the other hand only a torsion spring for vibration damping about the end of the hollow shaft 12. It can only be rotated when 31 is rotated. As the torsion spring 31 is rotated, damping is created due to the relative surface friction of the individual hexagonal bars in the bar bundle, whereby the elastic movement of the drive disc 20 is damped relative to the drive shaft 13.

In FIG. 2, the same detailed parts are represented by the same reference numerals as in FIG. In this case, in particular, the form engaging means 16 at the inner end of the hollow chamber 15, like the form engaging means 24 in the hub 23 of the drive disk 20, are also formed in the form of a hexagon socket. It can be seen that the torsion spring 31, composed of individual hexagon bars 32, consists entirely of hexagons. As shown in this figure, the bearing sleeve 17 can be preassembled with the bearing bush 19 and the drive disk 20 with the bearing sleeve 21 and can be fixed relative to one another in the axial direction. The bearing sleeve 17 is inserted along the thread on the fixing region 14 of the hollow shaft 12, and finally, the bar bundle of the torsion spring 31, consisting of individual hexagonal bars 32, has an end shape. It is axially inserted into the part and secured axially until it is formally engaged with the engagement means 16 and the form engagement means 24.

In Fig. 3, the same detailed parts are represented by the same reference numerals as in the figure.

The inner bearing face 25 is additionally indicated in the bearing area 18 of the bearing sleeve 17 and the outer bearing face 26 is additionally indicated in the bearing sleeve 21 of the drive disc 20. Between these two faces is a friction bearing bush 19. Needle bearings may be used in place of such friction bearing bushes. The outer thread 27 is also marked on the fixed area 14 of the hollow shaft 12 and the inner thread 28 in each position in the bearing sleeve 17.

4, 5 and 6 show a second embodiment of the torsional vibration damping apparatus according to the present invention, and correspond broadly to FIGS. 1, 2 and 3, and the description thereof, and reference numerals thereof. It can be applied to the second embodiment. The same detail parts are denoted by the same reference numerals, while only the modified detail parts are indicated by a single mark. Here, unlike the first embodiment, the torsion spring 31 'is provided as a solid bar. Damping force is generated due to internal material damping during torsion. The torsion spring 31 'has hexagonal end regions 35 and 36, with the central region in the form of a circular solid bar.

7, 8 and 9 show a third embodiment of the torsional vibration damping device according to the present invention, and correspond broadly to FIGS. Can be applied to the third embodiment, which is the same as the description of FIGS. 1, 2 and 3. Only modified detailed parts are indicated by the double mark ˝. Identical detailed parts are denoted by the same reference numerals. Differently from the first and second embodiments, the bearing region 18 'of the bearing sleeve 17' is located inside the bearing sleeve 21 'of the drive disk 20' which is located facing the outside. By this, the bearing region 18 'forms the bearing face 29 located on the outside, and the bearing sleeve 21' forms the bearing face 30 located on the inside. The bearing region 18k is bounded by a flange 34 on the drive shaft side. The friction bearing bush 19b is located between the two bearing faces 29, 30. In addition, a needle bearing may be used instead of such a friction bearing bush.

10, 11 and 12 show a fourth embodiment of the torsional vibration damping device according to the present invention, which corresponds broadly to FIGS. 4, 5 and 6, and the description thereof, and reference numerals thereof. Applicable to the fourth embodiment, the same reference numerals are the same as those in Figs. Only modified detail parts are indicated by the triple mark '' '. The same detailed parts are indicated by the same reference numerals, while only the modified detailed parts are indicated by a single mark. Differently from the first and second embodiments, the torsion spring 31 '' 'is shown as a hollow hollow bar. Damping force is generated due to internal material damping at the time of torsion. The torsion spring 31 '' 'includes an end region that is hexagonal on the outside, formed as a hex socket at the shaft side end, and the central region is provided with a circular hollow bar both inside and outside. Inside the hollow bar is an additional torsion spring 38 in the form of a bar which is formed as a solid bar and comprises end regions 39, 40 in the form of a hexagon. On the front end 39 protruding from the drive disk 20 is located a disk-shaped cushioning mass 41 with a central hexagonal socket opening 42, while the rear end 40 is formally coupled torsion springs. It is inserted into the hexagon socket 37 of 31 '' '. As can be appreciated, the additional torsion spring 31 '' 'is not located in the torque flow from the drive shaft 13 to the drive disk 20, and free torsional vibration is possible with respect to the drive shaft 13. By appropriate selection of the spring strength of the torsion spring 38 and / or of the size of the cushioning mass 41, the natural frequency of this shock absorbing component is adjusted, whereby a constant frequency of rotational vibration of the drive shaft 13 Can be suppressed.

According to a further preferred, it is proposed to provide a shock absorbing component coaxially formed with respect to the drive shaft. In this way, the disadvantageous natural frequency range of the drive shaft can be eliminated, which is possible by means of a method which can be installed in the available space. In particular, with respect to the torsion spring provided in the form of a hollow shaft, the shock absorbing component is located in the torsion spring 31, with its shaft end end rotationally fixed at least indirectly with the drive shaft and with its other end. It is proposed to include an additional bar-shaped torsion spring 38 that bears a cushioning mass 41 capable of free rotational vibration.

By using a bar-shaped torsion spring in the hollow shaft according to the invention, a very simple design can be realized which combines the effects of the spring and the damping device into one part, and the torsion spring made of metal has a temperature- and other ambient Long life, regardless of impact, fewer parts, resulting in inexpensive assembly.

Claims (14)

Separating device for the drive disk 20 connected with the drive shaft 13 through the torsion spring 31 for torque transmission, the end of the drive shaft 13 is formed as a hollow shaft 12, the torsion spring 31 Is a bar shape, one end of the torsion spring is fixedly rotatably fixed to the drive shaft 13 and the shutoff portion to the drive disk 20, and is supported to be freely rotatable facing the free end of the hollow shaft 12. Separating device for a drive disc, the bearing sleeve (21) is firmly coupled to the drive disc (20). 2. The bearing sleeve (17) according to claim 1, wherein on the drive shaft (13), in particular on the area of the hollow shaft (12), the bearing sleeve (17) supported and interacting with the bearing sleeve (21) of the drive disc (20) is fixed. Separating device for a drive disk characterized in that. Separating device according to claim 2, characterized in that the bearing region (18) of the bearing sleeve (17) surrounds the bearing sleeve (21) located on the inside of the drive disk (20) on the right side. Separation according to claim 2, characterized in that the bearing area (18 ') of the bearing sleeve (17') is located in contact with the inside of the bearing sleeve (21 ') located outside the drive disk (20'). Device. The bearing means, in particular a friction bearing bush 19, between the bearing sleeve 17 on the drive shaft 13 and the bearing sleeve 21 in the drive disk 20. Separating device for a drive disk, characterized in that provided. 6. The drive according to claim 2, wherein an axial fixation means is provided between the bearing sleeve 17 and the drive disc 20 to allow each other the relative possibility of rotation of the two parts. 7. Separation device for discs. 7. The drive disc according to claim 2, wherein the bearing sleeve 17 is screwed onto the fixing area 14 on the hollow shaft 12 area of the drive shaft 13. Separation device. 8. Separating device according to any one of the preceding claims, characterized in that the torsion spring (31 ') consists of a bundle of bars of individual bars, in particular hexagonal bars. 8. Separating device according to any one of the preceding claims, characterized in that the torsion spring (31 ') is a solid component. 10. The end region 35, 36 of the torsion spring 31 is in the drive shaft 13 by means of form-coupled means 16, and in form-coupled means. Separating device for a drive disc, characterized in that it is rotationally fixed and interacts in the drive disc 20, in particular via a hexagon socket opening. 11. Separating device according to claim 9 or 10, characterized in that the torsion spring (31) is provided in the form of a solid bar, in particular having a central cross section circular in cross section and an end cross section polygonal. 11. Separating device for a drive disc according to claim 9 or 10, characterized in that the torsion spring (31) is provided in the form of a hollow bar, in particular having a central cross section which is circular in cross section and an end cross section which is polygonal. Separation device according to any one of the preceding claims, characterized in that a shock absorbing component is provided coaxially with respect to the drive shaft (13). 14. The shock absorbing component according to claim 12 or 13, wherein the shock absorbing component is located in the torsion spring 31, the shaft end of which is coupled in a rotationally fixed manner at least indirectly with the drive shaft, and the other end of which is capable of rotational vibration. Separating device for a drive disc, characterized in that it comprises another bar torsion spring (38) having a buffer mass (41).

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