DE102018220836A1 - Split gear with several gear parts that can be braced in the circumferential direction - Google Patents

Abstract

A split gearwheel with at least two gearwheel parts (1, 2) that can be braced in the circumferential direction is proposed, at least one first spring element (3) and one second spring element (4) in mutually facing axial-side recesses (5, 6) of the gearwheel halves (1, 2 ) are included at least in sections and the first spring element (3) and the second spring element (4) are operatively connected to one another in the circumferential direction.

Description

The present invention relates to a divided gearwheel with at least two gearwheel parts which can be braced in the circumferential direction.

For example from the publication DE 10 2008 050 472 B4 is a split gear with two braced halves of the gear known. A spring element is arranged between the two gear wheel halves, which in the assembled state is supported on the one hand on the first gear wheel half and on the other hand on the second gear wheel half. Due to the spring element, the two gear wheel halves are braced against one another in the circumferential direction in the assembled state and are thus in operative connection with one another. To accommodate the spring element, the first gear half has an axially extending collar in which a groove is provided. The spring element is inserted into the groove before the second gear half is pushed onto the collar. When the second gear half is pushed onto the collar, the spring ring inserted into the groove is elastically deformed. This dips into the groove and clears the way for the second half of the gear. The second half of the gear can thus be pushed onto the collar until it has reached its joining position on the collar. An axially positive connection is thus formed between the two gear wheel halves, so that the gear wheel halves are braced. The fact that the gear wheel halves are clamped over the spring element eliminates the backlash in the toothing.

However, it has been shown that in the known split gearwheel there is a superimposed bearing force in the low load range and an unfavorable bearing load in the high load range as well as a negative toothed contact pattern in all load ranges. The result of this is a tilting moment that the gear wheel tilts in its bearing and thus leads to poor load distribution in the bearing and at the tooth mesh.

The object of the present invention is to improve a divided gearwheel of the type described at the outset in such a way that, while ensuring freedom from play, an improved toothed contact pattern is realized without undesirable bearing loads.

This object is achieved according to the invention by the features of patent claim 1, advantageous and claimed further developments resulting from the subclaims and the description and the drawings.

Accordingly, a divided gearwheel with at least two gearwheel parts which can be braced in the circumferential direction is proposed. In order to further optimize the divided gear, provision is made for at least a section of at least a first spring element and a second spring element to be accommodated in mutually facing axial-side recesses in the gear wheel halves in the tensioned state of the gear, the first spring element and the second spring element being operatively connected to one another in the circumferential direction stand.

The tension of the split gear in the circumferential direction ensures that there is no play on the toothing. In order to obtain an optimized contact pattern on the toothing of the gearwheel at the same time, it is necessary to design this bracing in such a way that no tilting forces or tilting moments result from it. This is achieved in the split gear according to the invention by the plurality of spring elements which are operatively connected to one another. Due to the uniformly distributed points of application of the spring elements on the gear parts, a balance of forces arises solely from the spring forces. The counter torque is supported in the tooth mesh. This also ensures that no additional forces occur on the gear bearing.

In the case of the proposed divided gearwheel, by introducing the force acting in the circumferential direction on the gearwheel at a number of positions distributed over the circumference, a torque is introduced into the gearwheel by using a plurality of spring elements, without generating a corresponding tilting moment and without resulting bearing forces. This load introduction is made possible by the spring elements that are operatively connected to one another. As a result, a tilting torque-free bracing of the divided gearwheel is advantageously realized.

To accommodate the spring elements, each gear part has at least two recesses along the mutually facing, axial-side circumferential area, which have a support area or the like for supporting the spring elements on the circumferential direction. The structural design of each recess is carried out in such a way that they can accommodate the spring elements at least in sections. Each recess can preferably be a ring segment or the like.

A preferred embodiment of the proposed divided gearwheel can provide that a first gearwheel half and a second gearwheel half are provided as gearwheel parts. Within the scope of this embodiment, a first recess and a second recess can each be designed as a half-ring segment on each half of the gear wheel. A half-ring segment is understood to mean a ring segment which extends approximately along a circumferential angle extends from about +/- 180 °, so that two half-ring segments cover approximately the axial-side circumferential area. Furthermore, in this preferred embodiment, the respective support area can form one of the end sections of the half-ring segment. In order to achieve optimal support of the support force directed in the circumferential direction, for example in the form of a torque, the support regions of the two half-ring segments are arranged opposite one another on the circumferential region in order to achieve a support that is uniform with respect to the circumference.

Various types of springs can be used as the spring element. A particularly preferred embodiment provides that a split spiral spring washer element is provided as the spring element. Because a number of turns less than 1 is realized in this embodiment, the spring washer elements can be produced inexpensively as stamped parts. In the context of the design with only two spring elements, these can be of identical construction, for example, and can be screwed or clamped together in the circumferential direction as a spring assembly, so that they can be mounted particularly easily as a pre-assembly unit between the gear wheel halves. Axial pretensioning of the spring assembly in itself can significantly simplify handling and assembly and also generate a certain amount of damping due to internal friction.

However, it is also possible within the scope of the invention that a plurality of spring elements which are not of identical construction are used. In particular, it is also possible to vary the number of turns of each individual spring. A desired tilting or bearing force can be forced, for example, by specifically varying the individual stiffnesses and / or the positioning of the spring elements. Depending on the design of the spring elements of the proposed split gear, they do not have to be screwed into one another in order to realize an operative connection. The spring elements can also only abut one another or the like for realizing the operative connection.

A particularly preferred application provides that the divided gear is designed as a planet gear of a planetary gear or as an idler gear in a spur gear, for example for realizing a reversal of the direction of rotation for a reverse gear.

• 1 eine schematische dreidimensionale Ansicht eines erfindungsgemäßen geteilten Zahnrades mit mehreren Federelementen im verspannten bzw. montierten Zustand;
• 2 eine Einzelteilansicht eines Federelementes als geteiltes, spiralförmig verlaufendes Federscheibenelement;
• 3 zwei miteinander in Umfangsrichtung in Wirkverbindung stehende bzw. verschraubte Federscheibenelemente;
• 4 beispielhaft eine Zahnradhälfte des geteilten Zahnrades mit Ausnehmungen als Halbringsegmente an dem axialseitigen Umfang der Zahnradhälfte;
• 5 beispielhaft eine Zahnradhälfte mit dem in der zugeordneten Ausnehmung an einem Abstützbereich abgestützten Federscheibenelement; und
• 6 beispielhaft eine Zahnradhälfte mit zwei jeweils in den zugeordneten Ausnehmungen abgestützten Federscheibenelementen als Federpaket.

In the following, the present invention is further explained by way of example with reference to the figures. Show it:

• 1 is a schematic three-dimensional view of a split gear according to the invention with a plurality of spring elements in the tensioned or assembled state;
• 2nd a partial view of a spring element as a divided, spiral spring washer element;
• 3rd two spring washer elements that are operatively connected or screwed together in the circumferential direction;
• 4th an example of a gear half of the divided gear with recesses as half-ring segments on the axial circumference of the gear half;
• 5 an example of a gear wheel half with the spring washer element supported in the associated recess on a support area; and
• 6 an example of a gear wheel half with two spring washer elements each supported in the associated recesses as a spring assembly.

In the 1 to 6 a concrete embodiment of a split gear according to the invention is shown as an example. In this embodiment, the split gear comprises only a first gear half 1 and a second gear half 2nd , which can be clamped together in the circumferential direction in order to achieve freedom from play in the tooth meshings, since the backlash in the toothing is eliminated by the clamping.

In the split gear according to the invention it is provided that at least one first spring element 3rd and a second spring element 4th are received at least in sections in axially facing recesses of the gear wheel halves, the first spring element 3rd and the second spring element 4th are in operative connection with one another in the circumferential direction by screwing them together or twisting them into one another. By using several spring elements 3rd , 4th the points of attack are evenly distributed over the circumference of the gear halves 1 , 2nd distributed and thus there is a balance of forces solely from the spring forces. The counter torque is supported in the tooth mesh.

In 1 is that with the two gear halves 1 , 2nd composite and over the two spring elements 3rd , 4th exemplified braced gear.

2nd shows a single part view of a first spring element designed as a split spring washer element 3rd , the second spring element 4th is also identical in construction. The fact that the spring washer elements 3rd , 4th quasi have a spiral course, ie are not flat, these can advantageously be screwed or twisted into one another, which, for example, in 3rd is shown.

In 4th is an example of the first gear half 1 shown, the second gear half 2nd is constructed identically. A first recess 5 and a second recess 6 are each designed as half ring segments and on the axial circumferential area of the first gear half 1 or also on the second half of the gear 2nd arranged so that the recesses 5 , 6 of the gear halves 1 , 2nd are facing each other. An end portion of each half ring segment as a recess 5 , 6 forms a support area 7 , 8th for the spring washer elements 3rd , 4th . The second half of the gear 2nd is, as already stated, constructed identically, so that the recesses there too 5 , 6 are provided. The recesses 5 , 6 have a gradient, so that each spring washer element 3rd , 4th on the respectively assigned support area 7 , 8th can concern. As a result, the spring washer elements 3rd , 4th only in sections in the assigned recess 5 , 6 added just like it out 5 can be seen.

5 namely shows the first spring washer element 3rd which is in the assigned recess 5 is recorded in sections and on the support area 7 is present.

In 6 is also the second spring washer element 4th in the assigned recess 6 arranged, the two spring washer elements 3rd , 4th are screwed together in the circumferential direction and are mounted as a spring assembly.

Because the support areas 7 , 8th quasi diagonally opposite on the axial circumferential area of each gear half 1 , 2nd are arranged as it is in 4th is shown, the force application points of the spring washer elements 3rd , 4th evenly distributed over the circumference.

To assemble the gear shown as an example, the two gear halves 1 , 2nd with the two opposite points of attack or support areas 7 , 8th for the spring washer elements 3rd , 4th used, the two intertwined spring washer elements 3rd , 4th as a spring assembly between the two gear halves 1 , 2nd to be ordered. Then the gear halves 1 , 2nd can be clamped by turning them in the opposite direction without generating undesirable reaction forces. This assembled state is in 1 shown.

Reference symbol list

1

first gear part or first gear half

2nd

second gear part or second gear half

3rd

first spring element or first spring washer element

4th

second spring element or second spring washer element

5

first recess

6

second recess

7

first support area

8th

second support area

QUOTES INCLUDE IN THE DESCRIPTION

This list of documents listed by the applicant has been generated automatically and is only included for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Patent literature cited

• DE 102008050472 B4 [0002]

Claims (11)

Split gearwheel with at least two gearwheel parts (1, 2) which can be braced in the circumferential direction, characterized in that at least one first spring element (3) and a second spring element (4) in mutually facing axial-side recesses (5, 6) of the gearwheel halves (1, 2) are included at least in sections, the first spring element (3) and the second spring element (4) being operatively connected to one another in the circumferential direction. Split gear after Claim 1 , characterized in that each recess (5, 6) of the gear parts (1, 2) has a support region (7, 8) for supporting the spring element (3, 4) arranged in the associated recess (5, 6) on the circumferential direction. Split gear after Claim 1 or 2nd , characterized in that each gear part (1, 2) has at least two recesses (5, 6) along the axial side circumferential region, the recesses (5, 6) each forming a ring segment. Split gear after Claim 3 , characterized in that a first recess (5) and a second recess (6) are each designed as a half ring segment. Split gear after Claim 4 , characterized in that the support areas (7, 8) of the recesses (5, 6) each form an end section of the half-ring segments, the end sections being arranged as support areas (7, 8) on the peripheral area opposite one another. Split gear according to one of the preceding claims, characterized in that a split spring washer element is provided as the spring element. Split gear after Claim 6 , characterized in that at least a first spring washer element (3) and a second spring washer element (4) are provided, which are of identical construction. Split gear after Claim 7 , characterized in that the two spring washer elements (3, 4) can be screwed together as a spring assembly in the circumferential direction. Split gear according to one of the Claims 1 to 6 , characterized in that several not identical spring elements (3, 4) are provided. Split gear according to one of the preceding claims, characterized in that a first gear half and the second gear part (2) a second gear half are provided as the first gear part (1). Split gear according to one of the preceding claims, characterized in that it is designed as a planetary gear of a planetary gear or as an intermediate gear of a spur gear.

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