DE102020205067A1 - Spur gear stage for a power split gear - Google Patents

Abstract

A spur gear stage has a spur gear 2, which consists of a main gear 3 and a secondary gear 4, the main gear 3 being connected to the secondary gear 4 via a spring 5, so that the main gear 3 can rotate at least to a limited extent against the secondary gear 4, which means that in Engagement with another spur gear reduces the backlash.

Description

The invention relates to a spur gear stage in particular for a power split transmission according to the type defined in more detail in the preamble of claim 1.

Hydrostatic-mechanical power split transmissions have a hydrostatic power branch and a mechanical power branch, which are summed in a summing gear. A drive motor, for example an internal combustion engine, drives the summation gear via a spur gear stage.

the DE 10 2012 216 046 A1 discloses a hydrostatic-mechanical power split transmission with a spur gear stage 19 in which the spur gear Z1 is in meshing engagement with an intermediate gear Z5 and the intermediate gear Z5 meshes with the spur gear Z6. The changing loads on the spur gear stage, especially when operating with a power take-off shaft, can lead to the development of noise due to the meshing of the spur gear stage. This noise development is also known as rattling.

The present invention is based on the object of creating a spur gear stage which can also be operated with low noise when the power split transmission is operated with a power take-off shaft.

The object is achieved with a spur gear stage according to the generic type of the characterizing features of the main claim.

According to the invention, the spur gear stage consists of at least a first and a second spur gear, the teeth of which mesh with one another. The second spur gear has a main gear and a secondary gear, which are designed to be partially rotatable with respect to one another. Both the secondary gear and the main gear have teeth which mesh with the teeth of the first spur gear. The main wheel is connected to the secondary wheel via an elastic element. The main gear and the secondary gear are positioned relative to one another via the elastic element so that when the main gear and the secondary gear mesh with the first spur gear, the elastic element applies a torque between the main gear and the secondary gear. This torque eliminates the backlash between the meshing gears. The main wheel is made considerably wider than the secondary wheel, which means that the secondary wheel can be designed in the shape of a disk. As a result, the main gear transmits the torque of the drive train and the secondary gear minimizes the backlash in order to minimize the development of noise.

In a further embodiment of the invention, the spur gear stage not only has two spur gears but, as in FIG DE 10 2012 216 046 A1 three spur gears, with the middle spur gear in the DE 10 2012 216 046 A1 is referred to as an intermediate gear. the 1 and in particular the description of the figures 1 the DE 10 2012 216 046 A1 should hereby be fully included. In particular, the spur gear stage 19 is to be included, the spur gear Z1 being designed as a first spur gear according to the invention, the intermediate gear Z5 being designed as a second spur gear according to the invention and the spur gear Z6 being designed as a third spur gear.

According to the invention, the first spur gear is designed without a secondary gear and thus has only one main gear. The second spur gear has a secondary gear and a main gear, the teeth of the secondary gear and the main gear meshing with the teeth of the first spur gear. The third spur gear has a secondary gear and a main gear, the gearing of the main gear and the secondary gear of the third spur gear meshing with the gearing of the main gear of the second spur gear and the gearing of the secondary gear of the second spur gear not meshing with the gearing of the main gear and the secondary gear of the third Spur gear is engaged.

The inventive design of the spur gear minimizes the backlash both in pulling mode and in pushing mode, since the direction of rotation of the drive motor, which is connected to the first spur gear, remains the same in pulling mode as well as in pushing mode.

In order to connect the secondary gear to the main gear via the elastic element, the secondary gear is first firmly connected to the main gear via the elastic element so that the teeth are aligned. The secondary gear is now rotated until a previously defined torque is reached between the secondary gear and the main gear. The connection of the secondary gear to the main gear via the elastic element is now released again in this position and then closed again. As a result, the toothing of the secondary gear is offset from the main gear, but the elastic element does not generate any torque in this state. If the teeth of the first spur gear are now brought into engagement with the teeth of the second spur gear, thus the main gear and the secondary gear are in engagement with the teeth of the first spur gear, whereby the teeth of the main gear and the secondary gear are aligned, the elastic element generates the Torque between the main gear and the secondary gear, which minimizes backlash. This minimizes rattling. So that the main wheel and the secondary wheel are arranged coaxially during assembly, a centering mandrel or a centering shaft can be used for assembly.

The elastic element can consist of a resilient metal such as, for example, spring steel, but there is also the possibility that the elastic element consists of a plastic or rubber. The elastic element can be connected directly to the main wheel and the secondary wheel, but there is also the possibility that the elastic element is arranged between the main wheel and the shaft and / or the secondary wheel and the shaft and is fastened to them.

• 1 zeigt das zweite Stirnrad mit einem Hauptrad und einem Nebenrad;
• 2 zeigt die Stirnradstufe 19 der DE 10 2012 216 046 A1 mit der erfindungsgemäßen Ausbildung dieser Stirnradstufe.

Further features can be found in the description of the figures.

• 1 shows the second spur gear with a main gear and a secondary gear;
• 2 shows the spur gear stage 19 of the DE 10 2012 216 046 A1 with the design of this spur gear stage according to the invention.

• Das zweite Stirnrad 2 weist ein Hauptrad 3 und ein Nebenrad 4 auf. Das Hauptrad 3 und das Nebenrad 4 sind über die Feder 5, welche das elastische Element bildet, verbunden. Die Feder 5 weist einen kreisringförmigen Abschnitt 6 sowie Stege 7 auf. Die Stege 7 greifen in Nuten 9 ein, wobei die Nuten 9 mit dem Hauptrad 3 drehfest verbunden sind. Die Nuten 9 können in dem einstückig ausgebildeten Hauptrad 3 vorhanden sein, es besteht jedoch auch die Möglichkeit, dass die Nuten 9 in einem Wellenstück vorhanden sind, welches drehfest mit dem Hauptrad 3 verbunden ist. Im Abschnitt 6 sind Langlöcher ausgebildet, durch welche Befestigungsmittel 8 hindurchragen, mittels welchen die Feder 5 drehfest mit dem Nebenrad 4 verbunden werden kann. Die Befestigungsmittel 8 können als Schrauben ausgebildet sein. Es besteht jedoch auch die Möglichkeit, andere form- oder stoffschlüssige Verbindungen zu verwenden. Bei der ersten Montage wird bei gelösten Befestigungsmitteln 8 die Verzahnung des Nebenrades 4 so zur Verzahnung des Hauptrades 3 positioniert, dass beide Verzahnungen eine Linie bilden und somit fluchten. Nun werden die Befestigungsmittel 8 befestigt, wodurch die Feder 5 drehfest mit dem Nebenrad 4 verbunden ist. Dann wird das Nebenrad 4 so weit verdreht, bis die Feder 5 ein definiertes Drehmoment zwischen dem Nebenrad 4 und dem Hauptrad 3 aufbringt. Dann werden die Befestigungsmittel 8 wieder gelöst, wodurch sich die Feder 5 in den Langlöchern so bewegt, dass die Feder 5 wieder entspannt wird. Nun wird erneut durch Befestigen der Befestigungsmittel 8 die Feder 5 drehfest mit dem Nebenrad 4 befestigt. Das zweite Stirnrad 2 ist somit einbaufertig. Der eingebaute Zustand des zweiten Stirnrades 2 ist in der 2 dargestellt. Das dritte Stirnrad 10 der 2 wird wie das zweite Stirnrad 2 der 2 montiert.

1 :

• The second spur gear 2 has a main wheel 3 and a side wheel 4th on. The main wheel 3 and the side wheel 4th are about the pen 5 , which forms the elastic member, connected. The feather 5 has an annular section 6th as well as bars 7th on. The bridges 7th grip in grooves 9 one, with the grooves 9 with the main wheel 3 are rotatably connected. The grooves 9 can in the one-piece main wheel 3 be present, however, there is also the possibility that the grooves 9 are present in a shaft piece, which rotatably with the main wheel 3 connected is. In the section 6th elongated holes are formed through which fastening means 8th protrude through which the spring 5 non-rotatably with the secondary wheel 4th can be connected. The fasteners 8th can be designed as screws. However, there is also the possibility of using other form-fitting or material-fitting connections. During the first assembly, the fasteners are loosened 8th the toothing of the secondary gear 4th so to the toothing of the main wheel 3 positioned so that both gears form a line and are thus aligned. Now the fasteners 8th attached, making the spring 5 non-rotatably with the secondary wheel 4th connected is. Then the secondary wheel 4th twisted until the spring 5 a defined torque between the side wheel 4th and the main wheel 3 brings up. Then the fasteners 8th loosened again, causing the spring 5 in the elongated holes so that the spring 5 is relaxed again. Now is done again by reattaching the fasteners 8th the feather 5 non-rotatably with the secondary wheel 4th attached. The second spur gear 2 is therefore ready for installation. The installed state of the second spur gear 2 is in the 2 shown. The third spur gear 10 the 2 becomes like the second spur gear 2 the 2 assembled.

• Die Verzahnung des ersten Stirnrades 1 ist durchgehend ausgebildet und das erste Stirnrad 1 weist nur ein Hauptrad auf. Die Verzahnung des ersten Stirnrades 1 kämmt mit der Verzahnung des zweiten Stirnrades 2 somit mit der Verzahnung des Hauptrades 3 und mit der Verzahnung des Nebenrades 4. Indem die Verzahnung des Nebenrades 4 und die Verzahnung des Hauptrades 3 mit der Verzahnung des ersten Stirnrades 1 im Eingriff steht, erzeugt die Feder 5, welche nicht dargestellt ist, ein Drehmoment zwischen dem Nebenrad 4 und dem Hauptrad 3. Das Flankenspiel wird dadurch minimiert. Das Hauptrad 3 des zweiten Stirnrades 2 weist eine durchgehende Verzahnung auf, welche mit der Verzahnung des Hauptrades 11 und der Verzahnung des Nebenrades 12 des dritten Stirnrades 10 im Eingriff steht. Das Nebenrad 4 kämmt nicht mit dem dritten Strinrad 12. Auch die nicht dargestellte Feder 5 des dritten Stirnrades 10 erzeugt beim Eingriff der Verzahnungen ein Drehmoment zwischen dem Hauptrad 11 und dem Nebenrad 12, wodurch das Flankenspiel reduziert wird. Das Geräusch beim Betrieb der Zapfwelle wird dadurch reduziert.

2 :

• The toothing of the first spur gear 1 is formed continuously and the first spur gear 1 has only one main wheel. The toothing of the first spur gear 1 meshes with the teeth of the second spur gear 2 thus with the toothing of the main wheel 3 and with the toothing of the secondary gear 4th . By the toothing of the secondary gear 4th and the toothing of the main wheel 3 with the toothing of the first spur gear 1 is engaged, generates the spring 5 , which is not shown, a torque between the side wheel 4th and the main wheel 3 . This minimizes the backlash. The main wheel 3 of the second spur gear 2 has a continuous toothing, which with the toothing of the main wheel 11 and the toothing of the secondary gear 12th of the third spur gear 10 is engaged. The secondary wheel 4th does not comb with the third wheel 12th . Also the spring, not shown 5 of the third spur gear 10 generates a torque between the main gear when the gears mesh 11 and the side wheel 12th , which reduces the backlash. This reduces the noise when operating the PTO shaft.

List of reference symbols

1

first spur gear

2

second spur gear

3

Main wheel

4th

Secondary wheel

5

feather

6th

section

7th

web

8th

Fasteners

9

Groove

10

third spur gear

11

Main wheel

12th

Secondary wheel

QUOTES INCLUDED IN THE DESCRIPTION

This list of the documents listed by the applicant was generated automatically and is included solely 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 102012216046 A1 [0003, 0007, 0012]

Claims (10)

Spur gear stage with at least a first spur gear (1) and a second spur gear (2), characterized in that the second spur gear (2) consists of a main gear (3) and a disc-shaped secondary gear (4), the main gear (3) and the The secondary gear (4) are connected to each other and the main gear (3) and the secondary gear (4) can be rotated against each other at least to a limited extent and the teeth of the main gear (3) and the teeth of the auxiliary gear (4) at the same time as the teeth of the first spur gear (1) are in engagement and when the secondary gear (4) and the main gear (3) engage in the toothing of the first spur gear (1), a torque is generated between the main gear (3) and the secondary gear (4). Spur gear stage after Claim 1 , characterized in that the main wheel (3) are connected to the secondary wheel (4) with the interposition of an elastic element (5). Spur gear stage after Claim 2 , characterized in that the toothing of the secondary gear (4) is arranged offset to the toothing of the main gear (3) when the elastic element (5) is in the initial state, the toothing of the second spur gear (2) not in engagement with the teeth of the first spur gear (1) is located and the elastic element (5) is in the deformed state when the teeth of the second spur gear (2) are in engagement with the teeth of the first spur gear (1). Spur gear stage after Claim 2 , characterized in that the elastic element is a spring. Spur gear stage after Claim 4 , characterized in that the spring has a circular ring (6) from which radially inwardly directed webs (7) extend, the webs (7) being connected to the main wheel (3) and the circular ring (6) to the side wheel (4) is in connection. Spur gear stage after Claim 5 , characterized in that the circular ring (6) has elongated holes through which fastening means (8) protrude, with which the circular ring (6) is connected to the secondary wheel (4). Spur gear stage after Claim 5 , characterized in that the webs (7) engage in grooves (9), the grooves (9) being connected to the main wheel (3). Spur gear stage after Claim 1 , characterized in that the toothing of the main gear (3) of the second spur gear (2) meshes simultaneously with a toothing of a main gear (11) and a secondary gear (12) of a third spur gear (10) without the toothing of the secondary gear ( 4) of the second spur gear (2) meshes with the teeth of the third spur gear (10). Method for assembling a spur gear stage with a first spur gear (1) and a second spur gear (2), with a main gear (3) and a secondary gear (4), whereby an elastic element (5) with the secondary gear (4) and the main gear ( 3) is connected when the teeth of the secondary gear (4) and the main gear (3) are in a line and then the secondary gear (4) is rotated to the main gear (3) until a previously defined torque between the secondary gear (4) and the main wheel (3) acts and in this position the connection with the elastic element (5) is released again, so that the elastic element (5) relaxes again and then the elastic element (5) again with the main wheel (3) and the Side gear (4) is connected so that this torque acts when the first spur gear (1) engages in the second spur gear (2). Power split transmission with a spur gear stage according to Claim 1 .

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