EP1368575A1

EP1368575A1 - Rotationally elastic shaft coupling

Info

Publication number: EP1368575A1
Application number: EP02750545A
Authority: EP
Inventors: Rainer ANDRÄ
Original assignee: SGF Sueddeutsche Gelenkscheibenfabrik GmbH and Co KG
Current assignee: SGF Sueddeutsche Gelenkscheibenfabrik GmbH and Co KG
Priority date: 2001-03-14
Filing date: 2002-03-14
Publication date: 2003-12-10
Also published as: US20040058736A1; WO2002073056A1; DE10112260C1; US6846240B2

Abstract

A collar (40) consisting of loop-type elastic coupling elements (42) which each loop round a first moulded part (50) and a second moulded part (52) is arranged around a universal joint (12) comprising a first and a second essentially rigid joint body (14, 28). The first moulded parts (50) are rigidly connected to the first joint body (14) by means of a flange (22) and are arranged between the second moulded parts (52). The second moulded parts (52) are connected to a counter-flange (34) in a fixed manner, said counter-flange pertaining to a rotating body (62). Said rotating body forms an end of a torque transmission chain, the other end thereof representing the second joint body (28). The first joint body (14) comprises a tubular part (16) enveloping the second joint body (28), said tubular part comprising an outer generated surface (18) having a circular cross-section and supporting the elastic coupling elements (42) in the radial direction.

Description

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Steers with high torques do not withstand long enough if they consist of an elastomer that is soft enough to provide sufficient vibration decoupling.

For front wheel drives of motor vehicles, shaft couplings are required which allow large angular deflections of 30 degrees and more and at the same time require little installation space, especially in the radial direction. Known rigid cross-pin joints, tripod joints and cage-controlled constant velocity joints meet these requirements, but they all do

The disadvantage is that vibrations are transmitted almost undamped. In order to eliminate disturbing vibrations, attempts have therefore been made to arrange such joints and elastic joint disks axially in series. However, this results in double joint arrangements in which a torque-transmitting component, for example a shaft piece, is not adequately guided between the rigid universal joint and the elastic joint disk and, as a result, can cause an imbalance, which in turn generates disruptive vibrations.

The invention is therefore based on the object of providing a rotary-type shaft coupling which is particularly suitable for front-wheel drives of motor vehicles and which, given the torque to be transmitted, takes up a small amount of space and runs essentially unbalanced even at high speeds.

The object is achieved with the features of claim 1.

A torsionally flexible shaft coupling according to the invention can be composed of a universal joint of conventional design, in particular of a standard cross-pin joint, tripod joint or cage-controlled constant velocity joint, on the one hand, and a number of likewise conventional elastic coupling elements, including associated fittings, on the other hand. It is therefore possible to consistently use components which have proven themselves in series vehicles and which are low-cost. are adjustable. With the invention it is achieved, among other things, that the first flange is centered in relation to one another with respect to the counterflange, and thus two rotating bodies, in particular shafts, connected by a shaft coupling according to the invention for the transmission of torques, and yet remain acoustically decoupled from one another. also with regard to radial vibrations of high frequency. In addition, the elastic coupling elements are not significantly stressed on bending, but essentially only on tension, even when large torques are transmitted.

In the case of the shaft couplings known from FIGS. 2 and 4 of EP 0 563 940 A, it is already ensured that the shafts connected to one another are centered in relation to one another, but this is done by means of a metallic centering on the joint pins crossing one another; this centering is not suitable for acoustic decoupling.

Advantageous developments of the invention result from the subclaims:

The sliding blocks provided in accordance with claim 2 ensure that the mutual centering of the two flanges remains essentially wear-free even if the shafts or other rotating bodies connected by the shaft coupling according to the invention execute torsional vibrations of large amplitude and / or high frequency with respect to one another.

In the development described in claim 3, the tube section of the first joint body is used twice in a particularly space-saving manner, namely inside as a component of the universal joint, which is essentially rigid with respect to the angle of rotation, and outside as a component of the centering described.

While in the shaft coupling known from EP 0 563 940 A with a modified cross-pin joint, the ring made of elastic tical coupling elements contains only four such elements arranged one behind the other in the circumferential direction, a larger number of elastic coupling elements is provided in the arrangement according to the invention. As a result, a relatively large installation space for a correspondingly highly resilient universal joint is kept free radially within the elastic coupling elements.

The features of claim 5 also serve the purpose of keeping a sufficiently large installation space within the ring of elastic coupling elements for accommodating a highly resilient universal joint.

The development according to claim 6 guarantees that all elastic coupling elements with the desired accuracy are and remain symmetrical to the common central plane normal to the joint axis of the universal joint and the ring of elastic coupling elements. In the shaft coupling known from EP 0 563 940 A, this is not guaranteed because of inaccuracies in shape which cannot always be avoided and changes in shape of the elastic coupling elements which occur during operation.

The design of the fittings according to claim 7 and preferably also claim 8 facilitates the manufacture and assembly of the ring from loop-shaped elastic coupling elements.

Finally, the design and arrangement of the flanges described in claims 9 and 10 has proven to be particularly easy to install and space-saving.

Two exemplary embodiments of the invention are described in more detail below with the aid of schematic drawings. In it is: L »J> tt FF ¹

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P P 3 • d PJ CQ X Φ 3 P Ω P PJ X P Hj Φ P CQ PJ Hl P CQ LQ Ω p-

Φ PP ⁾ => d P rt 3 rt CQ tr F- P ⁾ 0 PP Hj LQ 3 LQ *. rf- O PJ F ¹ Φ φ>> d Φ φ

F- C! (Λ) LQ P = F- Φ F- rt CQ PJ CD Hj PP Ω φ φ φ to o PJ H ⁾ CQ cπ JP LQ PJ

P P 3 P CQ Ω rt P P = φ Φ rt 3 LQ '1 P tr Hj P Hj φ P

Φ P 1 tl PF "X rt Ω F- F- 0 o CQ rt φ P ⁾ P ⁾ P Ω 1 Φ Ω P LO P CQ

3 P. F- LQ o Φ Φ Φ XPP Φ 3 P P. 1 P. Φ rt PPP Φ Hj Hj P σ \ LQ LQ CQ Ω 1 F- Φ Hi φ P Φ P) I CQ 1 1 1 J 1 Φ tr 1 Hj P Hj CQ P 1

LO LO to to F ¹ F ¹

Lπ O LΠ o LΠ O LΠ

TJ Φ -i CQ H P α CQ p J

0 Hj Φ Ω Hj Φ Φ Ω Φ J

Hj CQ P. tr Φ Hi Ω tr CQ P.

3 F- Φ Φ F- X F-

CQ Ω CQ PJ Φ F- tr P rt tr t tr tr φ φ CQ

P = rt P. t F ¹ LQ Λ rt

Ω Φ Φ Φ LΠ Φ Hj F-

X F- Hj P F- tr σi P Φ P

Φ Ω P tr F- Hi tr Pi P. rt M P Hl tr

LΠ P - P P φ φ to • d O φ P P ISl

F- * d Φ> P rt P P

P. 3 F ¹ Φ Φ P. φ LQ

P P F- Hj P Φ P

Hj cd P P P ISl

Ω φ LQ P J Pi P tr Hj CQ cd F- P tr P Hj φ Φ Φ Φ tr Φ 3

Φ F- F ¹ tsi Φ F- • d Ω

F- Ω Φ P LQ F ¹ P. F> φ

P tr 3 LQ Hj P> φ P

Φ Φ 0 = LQ P P φ

P Hi P t i CΛ> Φ LQ P

P ⁾ rt P rt tr CQ X

Ω p. Φ 3 P Φ φ J

F "F- φ 0 = Φ PF ¹ Ω

Φ PJ Φ> F- LQ Hi P ⁾ φ tr

F- t P Ω 3 CQ rt P ⁾ F- s! tr φ φ

CQ F- F- P Ω φ tr P rt P CQ Pi tr F ¹⁾ rt

Φ P rt φ Φ F ¹ Hj CQ

F- Φ - Hi Φ rt F ¹

P Hi s! P φ φ. F- tr Z tr F- X P to Φ σι PJ F- Φ P P LQ o Φ CQ X »d tsi N Φ tr rt φ • d Z z P

F- Φ F- F ¹ Φ F-

P l_l. tr 3 P ⁾ P F- CQ P φ Φ 3 PP rt Ω P

HJ P P rt CQ LQ Φ tr P

PJ φ Hl • F ¹ P φ

P- CQ P ⁾ Φ LI. PP

F- F "P Φ α φ J TJ F ¹ X Φ CQ P

PJ CQ P Φ Ω F-

Φ p ⁾ P F- X Ω lO

Hj H! P ⁾ LQ P φ tr P

CQ PF ¹ φ J CQ PP Φ Hj

F- N Φ & F- CQ

Ω z TJ Hj CQ LΠ P rt tr Φ F- rt σι 1 Φ rt F- LQ TJ PJ LQ

P rt P F-

P Φ P ⁾ P. P φ. Q Hj LO P 00

Φ

LO LO t CO F F

Lπ o LΠ O LΠ O LΠ

φ Pi F- ö μ_i | _ ,. F ¹

P φ PP ⁾ PJ P Φ rt P CQ LQ PQ 3 Φ Φ Φ F "

Φ F- Hj J Hj F- PJ Q rt tr 0 rt p LQ

P rt PJ tr Φ Φ

P Φ F ¹ Hi 3 HQF "tr CQ P

Φ CQ rt Ω

CQ p. P = Φ l

Φ Φ Φ Ω rt CTi rt F- CQ X Hi -

IS! P F- rt Φ LQ F ¹ Φ <!

Φ Hj F ¹ CTl tr 0

P O Φ P

:! Ω P. LQ td P ⁾ X Φ Φ P

P ^ Φ CQ tr Φ

P • d PP ⁾ = P

Φ Φ Hl Φ P Φ o = H CQ P

3 00 Hj CQ Φ

F- o 3 rt P rt F- Φ -JP rt P ⁾ LQ P 00 Hj

Φ tr Φ

LQ P Ω P φ

CQ Φ Φ 3 F-

CD α F ¹ P

Φ Ω Hj Φ P. φ

F- tr Φ P F- CQ

P F "tr X Φ φ o X X F-

CQ CQ 0 = 0 = Ω P

CQ Hj Hj Φ

»Xj Φ> d * F ¹ TJ

PJ P φ φ Φ F-

Hj Hi P LQ rt P CQ CQ X • φ PP ⁾

P P. σi F ¹ Ω F tr t Φ> tr

P> F- 01 P

CQ PJ F- φ PJ Q rt P CQ Hi φ LQ rt LQ

CQ PJ Φ Φ

P 0 P ⁾ P CQ

00 Hj P Hj rt to CQ P. Φ φ

Φ P CQ P; F ¹

Pi F- φ Φ tr F "

F- P rt F- PJ rt

Ω Φ Φ P Hj tr 3 P Φ F- rf 3 LQ CQ td Φ rt P 1

LO O co co F ¹ F

LΠ O LΠ o σι O LΠ

X Ω P. σ P ¹ LQ CQ φ CQ CQ P 00 Hj P P- CQ td tr tr CQ tr Ω td Z LQ l_I. CQ CQ 3 'xj ISl 3 φ tr Φ P F- Φ φ rt F- O rt Φ CTi F- φ J rt F- Φ φ Ω Φ Φ tr Φ φ Φ rt rt PJ = F- P F-

Φ F ¹ Hj Φ Hj CD F- P 3 F- CQ LQ 3 CQ Φ P LQ F- tr F LQ Φ CQ P Φ φ CΛ> LQ LQ rt

LΠ Hj Φ Ω LQ rt LQ F- CQ N Φ CQ F "Hi Φ φ φ P Φ hh Φ F ¹ Φ • φ o P tr CO φ Φ φ Ω rt Ω Pi P Hj Φ φ P CQ F- P Φ PF "F- • xj F ¹ P φ- 0 P. Ω CQ F" P Φ tr Hj CQ Hi -J- rt z φ P φ Ω Hl rt PJ P rt Hj Φ r tr f p. Tr rt Z • d Φ PJ PJ N CQ φ Φ F- ISJ 3 I tr F ¹ P φ PJ φ S! PP Hi

N F- 0 = F- Hj Φ rt PJ F- PJ rt OP ⁾ F- F- CQ z PP 3 PPP Φ PP

P Ω Φ P ⁾ z rt P. P rt

F ¹ Φ 3 P PJ N 3 φ Φ φ Φ F- -. PJ P Φ Ω Ω CQ F ¹ P φ s;

P. tr PF ¹ P P. Hj Pi Φ φ F- P CQ Hj <! PF ¹ CQ LQ tr tr φ Ω d F "rt Φ

P Φ F- tr rt Φ φ ZP CQ P rt P Φ Φ F- CQ Ω Φ φ Φ P tr Φ Φ in F ¹

LΠ Hj Hj P Φ Cd Hi Φ • d LQ Φ cj TJ CQ Hj Hj • j P tr PP CQ rt F- P F- co Ω PP Φ CQ 0 F-> d Φ- Φ Hj 1 PJ Hl P. F- Hi P. Φ • CQ to CQ XN CQ Φ tr co P. P F- rt Ω CQ MO Hi Hl PJ P = c | Hj LQ 0 F- CQ F- LO O co> d P Φ rt φ LQ Φ- Φ LΠ P- CQ Φ tr Φ P PJ • xj 0 = Hj tr P Φ Φ P φ. i F- • • F- • LO

F- Φ P φ. O P P PJ CQ 0 Hi Hi rt tr H LQ LO Φ φ F- Φ • d LQ co

P CQ tr CQ F- 00 ISl LQ P CQ Hi 3 ISl P Φ tr Φ PJ Φ- P. φ ⁾ Ω PF ¹ φ Q rt N> xj Z F- Φ »xj oo P CQ CQ rt 3 F- PP Hj P ⁾ tr P. P φ F- P tr PP <

Φ φ ZF ¹ Φ PF ¹ F "CQ Φ CQ LQ CQ LQ CQ Hj F- φ Hi Φ Hj P Hi Φ CQ <! P Φ

CQ Ω P ⁾ Hi P PJ Hi JF "1 CQ rt Φ PJ CQ Ω • CQ CQ P Hj φ PP Φ 0 LQ φ n

Ω X P P. CQ P P = 3 Φ F- P = P 3 tr tr CQ φ CQ Pi Hj F- P F- Hj F- tr tr rt CO CQ Φ φ F- CQ Hi 3 3 LO Φ tr rt φ

• - 3 P P P

Hj σι Ω P z P Ω 3 Φ F-

F- P Ω φ φ F- P X cd φ F- φ P 3 ti Hj LQ

- 3 X Φ J P. P

P ⁾ tr P P. tr P. PP Φ Φ P = P CQ P P. φ Φ Φ rt Hj PF ¹ JP

P F- Φ LQ PJ F- LQ rt P. LQ LQ Ό PJ CQ P Ω X 3 - φ CQ φ z Φ tr P F- P Φ P CQ co Φ Φ Φ φ Z Lπ Φ Φ F- LQ Hi F- P. X Hj φ F- X Φ F- P rt P 3 P PJ = to Hl P Hj 0 to F ¹ tr Φ φ LQ P φ rt Φ F- CQ CQ Hj 3 CQ rt "*

P. co PJ = Φ 3 ISl J P P. 0 = LQ Φ P F- P o CQ φ F- Φ

P F- P co CΛ) Hj rt tr P CQ Φ. 3 P F- 00 Hj φ CQ CQ CQ CQ Φ F- P. Ω Hi P

P Φ F- F ¹ N LQ CQ t Hj P φ> F- tr P rt P. P F- cn P ⁾ P. X CQ P ⁾ tr φ F-

P. Φ P ¹ xj <! F- Z Φ rt P ⁾ Ω - LQ Φ P = φ F- CQ Ω φ 3 ⁾ rt CQ Hj CQ Φ

Ω CQ P F- 0 = Ω tr Φ Φ Ω tr Φ Φ CQ tr F ¹ Φ CQ tr X Φ CQ 0 Φ F- <

Hh Φ Φ P LQ tr 0 = P Hj tr F- P Hj rt φ CQ> d rt P CQ Hi X P 0 cd P.

Φ Z 3 • φ PJ H et Pi P P Φ Hj rt Φ J 0 O hh rt P φ φ

CQ F- LO F- 3 F- *] Φ F- Φ p. Φ tr φ H r Hi tr 0 = OP F- 3 rt P> xj Φ> φ. LQ cd LQ 0 F- 1 Φ 3 Hj rt PP tr P Φ hh ti Φ li Hj PP CQ Q P. P ⁾ P = Ω Φ Hi Ω L_I. CQ φ Φ P Hi 0 = P F- 3 Hi rt φ> ISl

Φ φ F ¹ PJ <! LQ LQ Φ 3 tr CQ tu N Φ rt LQ 3 cd F- LQ Hj Hj P. F- 0 = Φ 3 F- Z

ISl F ¹ P 0 Φ LQ CO CQ rt Ω φ φ P. φ 3 φ LQ Hj Hj Φ Φ

O o = CQ P z P φ Φ

Φ F "Φ Ω rt Φ tr Hi φ φ Hj 3 F- F- Φ co F- F- Ω Φ 3 CQ F- F ¹ F- Q Ω CQ LQ F- P tr P = Hi F" CQ F- CQ PJ = P CQ P σi P LQ Φ TJ P F- Ω P rt

Φ tr F- Φ Hj Ω 00 Hl Hj Ω rt F- rt rt ^! XJ CΛJ • d Φ Φ F ¹ F ¹ LQ tr Φ Φ

P Φ P tr Φ tr φ. P ⁾ XP Φ Φ ^f τj 0> ^χ j F-> ^χ j PPP φ P ⁾ Φ Φ> ^χ j F- P

Hj P F- Ω • PJ P Φ Z LQ P PJ Hj> ^χ j F- Φ F ¹ Φ PPP F- F- PH tr PP tr F- Φ F "P ⁾ 3 F- LQ F ¹ P ⁾ CQ XX CQ B CQ P LQ Φ Ω ü oo Φ P rt P CQ Φ Lπ Hj PP α Hj CQ LQ • PF "rX PJ Ω Ω Φ Hj Φ J 00 CQ φ CQ P- Ω o Pi Hh P 1 rt. F ¹ LQ CQ Φ Φ CQ Ω tr tr P rt FM

P. rt tr LΠ 0 = LQ Hl ISl P = φ. Φ Ω Hj F- Ω tr Φ P CQ - Φ Φ

P P. α Φ P 00 φ. P Hi 0 = P Ω tr LQ tr CQ P tr CQ F- CQ tr Hj P

Hj Φ PP ⁾ Ti LO P 3 P Hi CQ XP F- Φ Φ rt Φ P Φ to rt "d P. F- hh X

Ω Hj Hj Ω Φ> NP Φ F- P 3 PJ Φ P CQ P Φ Hj F- t rt PJ PJ CQ F- X tr Ω P ⁾ tr P ⁾ • PP LQ P. F- 3 P. φ Φ P Φ rt Hj CQ P 0 =

> XJ tr Ω P 3 LΠ Φ Φ LQ 3 LΠ LO F- tr P rt P P. P CQ LO P Hj

Z o CQ tr F ¹ CQ Fl to CQ P 2 Φ φ o LΠ P Φ ^f xj Φ PP Φ PP> d

F- HJ PJ CQ F- 3 Cd O P P P PJ P Sl o P CQ LQ P. P P φ

Hj 3 P t5 P co Φ tr P. Φ P LQ F- P PJ P CQ PJ F- P. Hi Φ Φ J LQ Hj

P CQ LQ PJ X rt P. Hh PJ Φ F ¹ rt Cd Φ PP ⁾ Hj Pi 0 PP Φ 3 LO Ω P Hj Hj cn rt CQ Hi CQ PJ J Φ rt Hj P ⁾ PJ P = tr Hi LQ Φ X CQ PJ φ. Φ LQ LQ CO

P. 0 F ¹ P ⁾ tr Hj 1 1 LQ LQ 0 = Φ F- Φ Hi 1 co Φ Φ φ co

Φ X 0 = F ¹ F "1 Φ Φ - F ¹ φ F- CΛ Hj 1

Hj 1 1 1 ¹ F- PI z φ F "

FI Φ 1 P 3 1

Wreath 40 made of elastic Kup lungselerne 42 held with its right end face in Fig. 3 on the two flanges 22 and 34.

Claims

claims

1. Torsionally flexible shaft coupling (10) with

a centrally arranged universal joint (12) which has a first and a second essentially rigid joint body (14, 28),

- A ring (40) made of loop-shaped elastic coupling elements (42) arranged around the universal joint (12), each of which wraps around a first shaped piece (50) and a second shaped piece (52), whereby

- The first shaped pieces (50) with the first joint body (14) are essentially rigidly connected and arranged between second shaped pieces (52), and

- The joint bodies (14, 28) and the coupling elements (42) are arranged essentially rotationally symmetrically with respect to a common joint axis (A) and essentially symmetrically with respect to a common center plane (B) normal to the joint axis (A) and for the transmission of torques in

Series are connected, characterized in that

- The first joint body (14) has a first flange (22) with which the first shaped pieces (50) are firmly connected and from which they extend parallel to the joint axis (A),

- The second fittings (52) are fixedly connected to a counter flange (34) and extend from it parallel to the hinge axis (A), - The counter flange (34) belongs to a rotating body (62) which forms one end of a torque transmission chain, the other end of which represents the second joint body (28), and

- The first joint body (14) has a pipe section (16) enveloping the second joint body (28) with an outer lateral surface (18) of circular cross-section, on which the elastic coupling elements (42) are supported in the radial direction.

2. Shaft coupling according to claim 1, characterized in that the elastic coupling elements (42) in the area of the second shaped pieces (52) each via a sliding block (60) on the lateral surface (18) of the tubular piece (16) of the first joint body ( 14) support.

3. Shaft coupling according to claim 1 or 2, characterized in that the tube piece (16) has on its inside raceways (20) for rolling elements (30) which belong to the universal joint (12) designed as a multipode or constant velocity joint.

4. Shaft coupling according to one of claims 1 to 3, characterized in that around the pipe section (16) of the first joint body (14) at least six coupling elements (42) are arranged one behind the other in the circumferential direction.

5. Shaft coupling according to one of claims 1 to 4, characterized in that - the first fittings (50) on the first flange (22), and the second fittings (52) on the counter flange (34) are each arranged in pairs and

- Each shaped piece (50, 52) is only connected to a single other shaped piece (52, 50) by an elastic coupling element (42), so that

- All coupling elements (42) are chained together without overlap.

6. Shaft coupling according to claim 5, characterized in that

- The first shaped pieces (50) are fastened between two first covers (56), and the second shaped pieces (52) between two second covers (58) on the associated flange (22, 34), with - all covers (56, 58 ) are arranged parallel to the central plane (B), and

- Lids (56, 58) belonging together in pairs have the same distances (d) from the central plane (B).

7. Shaft coupling according to claim 5, characterized in that each pair of first fittings (50) forms a U-shaped first bracket (84), and each 5 pairs of second fittings (52) forms a U-shaped second bracket (86).

8. Shaft coupling according to claim 7, characterized in that each of the shaped pieces (50, 52) has a .0 threaded hole (88) for fastening to the associated flange (22) or counter flange (34).

9. Shaft coupling according to one of claims 1 to 8, characterized in that the first flange (22) and the

.5 have counter-flange (34) annular sector-shaped recesses (26,38), of which the recesses (26) of the first flange (22) against the recesses (38) of the counter flange (34) are offset in rotation.

! 0 10. Shaft coupling according to claim 9, characterized in that the first flange (22) engages with play in the recesses (38) of the counter flange (34), and vice versa, so that both flanges (22,34) in a common plane lie.

15