DE102017112339A1 - Planetary gear with connected by locking pin ring gear and drive shaft with planetary gear - Google Patents

Abstract

The invention relates to a planetary gear (1) with a ring gear (2) and a rotatably connected to the ring gear (2) component (3), wherein the ring gear (2) relative to the component (3) via a locking pin (4) is secured against rotation , and wherein the locking pin (4) directly in a first recess (5) by the ring gear (2) and directly in a second recess (6) is supported by the component (3). In addition, the invention relates to a drive axle for a motor vehicle with this planetary gear (1).

Description

The invention relates to a planetary gear with a ring gear and a rotatably connected to the ring gear component. Furthermore, the invention relates to a drive axle for a motor vehicle, such as a car, truck, bus or other commercial vehicle. The drive axle can further preferably be designed in particular as an E-axis and thus additionally have an electric motor which is coupled to the planetary gear.

Generic planetary gears are already known from the prior art. The DE 10 2013 224 499 A1 discloses, for example, an optimized transmission arrangement for a vehicle with at least one housing, which forms a gear chamber in which at least one planetary gear set and a spur gear are accommodated, which are arranged on a common rotor shaft. In an engine compartment, a rotor of an electric machine, which rotates about a stator of the electric machine, is formed on this rotor shaft.

However, the means previously used to receive the ring gear in the housing often have the disadvantage that they are relatively expensive to manufacture. In particular with splines, splines or serrations there is a significantly increased manufacturing costs. Furthermore occur in these mounting means in the teeth relatively high voltages in the tooth root, which can lead to cracks in the ring gear or even in the housing.

It is therefore an object of the present invention to overcome the disadvantages known from the prior art and in particular to provide a recording of a ring gear with less manufacturing effort available and to avoid damage to the ring gear and the receiving component.

This is inventively achieved in that the ring gear is secured against rotation relative to the component via a locking pin, wherein the locking pin is supported directly in a first recess on the part of the ring gear and directly in a second recess on the part / component. This means that the corresponding locking pin for rotation lock is in direct contact with the component and the ring gear.

As a result, a toothing which is relatively complex to manufacture and which serves to prevent rotation is avoided. By locking pins a simple to produce in mass fuse element is provided, whereby the manufacturing cost is reduced. The recesses can be relatively easily formed in series.

Further advantageous embodiments are claimed with the subclaims and explained in more detail below.

Preferably, the component is a housing, wherein the ring gear is secured against rotation in the housing. In alternative embodiments, the component is designed as a planet carrier, as a sun gear or as a further ring gear.

If the ring gear and the component are made of different materials (with different coefficients of thermal expansion), the anti-rotation device used by the locking pin is particularly effective in order to minimize stresses caused by temperature differences. Thus, the fatigue strength of the connection between the ring gear and the component is further increased.

In this context, it is particularly advantageous if the ring gear consists of a steel material and / or the component consists of a light metal material, preferably an aluminum alloy.

It is also advantageous if the locking pin is held in one of the two recesses via a press fit / press fit and in the other of the two recesses in a radial direction and / or in an axial direction (seen with respect to the ring gear) game. Particularly preferably, the locking pin is held in the first recess on the press assembly and received in the second recess on the part of the component with radial and / or axial play. As a result, the manufacturing effort is further facilitated. In particular, during installation, the locking pins can first be inserted into the corresponding first recesses and, subsequently, in an assembly step, the entire ring gear locking pin unit can be inserted into the component / connected to the component.

If the locking pin is cylindrical, it is particularly easy to produce.

Are even more locking pins distributed along the circumference of the ring gear, a particularly uniform support of the ring gear is generated relative to the component.

It is particularly preferred if the locking pin is inserted in an axial direction (with respect to a rotational axis of the ring gear) aligned. The recesses therefore preferably extend in the axial direction.

In this context, it is also advantageous if the first recess is formed as a cylindrical hole.

In this regard, it is again expedient if the first recess is formed as a bore, more preferably as a blind hole, alternatively preferably as a groove.

Alternatively, it is possible in principle, not forming the first recess, but urformtechnisch, eg. In a casting or sintering process, such as a recess or as a free space to train directly with.

With regard to the second recess, it is advantageous if this is likewise designed as a cylindrical hole. As a result, the production of the second recess is further simplified.

With respect to the second recess, it is further expedient if this is formed by forming technology (for example as a recess or free space). More preferably, the second recess is formed directly in an injection molding process of the component (in particular when formed as a housing). As a result, the manufacturing cost of the second recesses is significantly reduced.

The second recess is advantageously designed as a radially inwardly open recess, whereby the weight of the component is further reduced. Alternatively, however, it is again possible to form the second recess as a groove or as a bore.

Is the ring gear seen in the radial direction with play accommodated in the component, i. Provided with play, a conscious relative displacement of the ring gear is made possible relative to the component, so that the voltages occurring during operation are further reduced.

In addition, it is advantageous if the ring gear is received elastically / displaceably in the axial direction. For this purpose, it is particularly expedient to provide a securing element which elastically supports the ring gear to an axial side. As a securing element is preferably a locking ring.

Furthermore, the invention relates to a drive axle for a motor vehicle, with a planetary gear formed according to the invention according to at least one of the embodiments described above. It is particularly advantageous if the drive axle is designed as an E-axis and a rotor of an electric motor with a rotary part of the planetary gear, such as a sun gear or a planet carrier, is rotationally coupled.

In other words, according to the invention a ring gear in the form of a toothed component by means of a cylindrical pin (locking pin) connected to a housing (component). The housing is preferably made of an aluminum alloy, the ring gear made of steel. The fixed to the housing ring gear is secured against twisting and walking (axial displacement). When driving, otherwise at operating temperature due to the different thermal compensation of aluminum and steel would set a game and relax the seat in principle. According to the invention, the ring gear is secured by means of at least one pin (locking pin). The pin can in principle be arranged radially, axially or arbitrarily transversely in space. It is further preferred that the pin sits on both sides in cylindrical holes and / or optionally engages in recesses. The recesses can be provided in principle in an injection molding of the housing, while cylindrical holes are to be attached only by an additional operation.

The invention will now be explained in more detail with reference to various embodiments in FIGS.

• 1 eine Längsschnittdarstellung eines teilweise abgebildeten erfindungsgemäßen Planetengetriebes nach einem ersten Ausführungsbeispiel, wobei der Verbindungsbereich zwischen einem Hohlrad und einem als Gehäuse ausgebildeten Bauteil des Planetengetriebes erkennbar ist,
• 2 eine perspektivische Darstellung des in 1 eingesetzten Gehäuses von einer Rückseite, sodass ein das Hohlrad aufnehmender Aufnahmeraum sowie mehrere zur Aufnahme von Sperrstiften dienende (zweite) Ausnehmungen des Gehäuses zu erkennen sind,
• 3 eine perspektivische Darstellung des in 1 eingesetzten Hohlrades von einer die mehreren (hier acht) Sperrstifte aufnehmenden Stirnseite,
• 4 eine Detaildarstellung des Planetengetriebes nach 1 im Bereich einer die Drehsicherung des Hohlrades relativ zum Gehäuse umsetzenden Sperrstiftes, der in je eine Ausnehmung seitens des Hohlrades sowie des Gehäuses eingesetzt ist, und
• 5 eine Längsschnittdarstellung eines teilweise abgebildeten erfindungsgemäßen Planetengetriebes nach einem zweiten Ausführungsbeispiel, wobei eine (zweiten) Ausnehmung seitens des Gehäuses nun in radialer Richtung nach innen geöffnet ist.

Show it:

• 1 a longitudinal sectional view of a partially depicted planetary gear according to the invention according to a first embodiment, wherein the connecting portion between a ring gear and a housing formed as a component of the planetary gear is recognizable,
• 2 a perspective view of the in 1 Inserted housing from a rear side, so that a recording space receiving the ring gear and a plurality of (second) recesses of the housing serving for receiving locking pins can be seen,
• 3 a perspective view of the in 1 used ring gear of one of the plurality (here eight) locking pins receiving end face,
• 4 a detailed representation of the planetary gear to 1 in the range of a rotation of the ring gear relative to the housing converting locking pin, which is inserted in a respective recess on the part of the ring gear and the housing, and
• 5 a longitudinal sectional view of a partially imaged planetary gear according to the invention according to a second embodiment, wherein a (second) recess on the part of the housing is now open in the radial direction inwards.

The figures are merely schematic in nature and are for the sole purpose of understanding the invention. The same elements are provided with the same reference numerals. Furthermore it is in principle also possible to freely combine the different features of the different embodiments with each other.

In 1 is an inventive planetary gear 1 partially illustrated according to a first embodiment. The planetary gear 1 is in this embodiment at a peripheral portion of a housing 3 in which a ring gear 2 recorded rotationally secured is illustrated. The housing 3 can alternatively also as another component 3 of the planetary gear 1 be replaced. Accordingly, this can with the ring gear 2 non-rotatably connected component 3 also be a planet carrier, a sun gear, or another ring gear. On the representation of the other components of the planetary gear 1 is omitted for clarity. The planetary gear 1 However, it is configured in the usual way and therefore has a plurality of planetary gears of one or more planetary gear sets, with the ring gear 2 comb. The planet gears are in turn rotatably mounted in a planet carrier. A sun wheel meshes with the planet wheels. The planetary gear 1 is preferably used in operation in a drive axle of a motor vehicle. The drive axle is designed as an electrical axis / E-axis. In addition to the planetary gear 1 In particular, the drive axle has an electric motor, which is rotationally coupled to a rotor with an input rotary part of the planetary gear, preferably the sun gear, or alternatively the planet carrier.

In 1 is the ring gear 2 already secured against rotation in the housing 3 used. The ring gear 2 typically has an internal toothing 8th on. The internal toothing 8th is designed as helical gearing. On a radial outside is the ring gear 2 gearless, ie essentially smooth. The ring gear 2 in itself is also particularly good in 3 to recognize.

The housing 3 is also in the 2 to recognize, with a receiving space 9 of the housing 3 is provided, in which the ring gear 2 according to 1 is mounted. The ring gear 2 is thus in the radial direction of the housing 3 surround.

According to the invention for rotational security of the ring gear 2 at least one locking pin relative to the housing 4 , in this embodiment, several locking pins distributed along the circumference 4 used. Each of the locking pins 4 is in a first recess 5 directly in contact with the ring gear 2 , Also is the locking pins 4 in a second recess 6 directly in contact with the housing 3 ,

In this embodiment, the respective locking pin 4 in the axial direction (ie parallel to a rotational axis of the ring gear 2 ). In principle, however, other orientations of the locking pin are conceivable, for example obliquely to the axial direction, for example. Also exclusively in the radial direction.

As a result, each locking pin is 4 from a first recess 5 supported in the circumferential direction. The first recess 5 is in an axial end face 10 of the ring gear 2 brought in ( 3 ). The first recess 5 is designed as a cylindrical hole. Preferably, the first recess 5 as a hole, namely a blind hole, as in 4 particularly recognizable, implemented.

The locking pin 4 is designed as a cylindrical pin. The locking pin 4 Thus, it has a constant outer diameter substantially over its entire length. Only the ends of the locking pin 4 are rounded or chamfered. The locking pin 4 is so with its outer diameter to an inner diameter of the first recess 5 that he agreed with a Pressverbund 7 in the first recess 5 is held / recorded. Thus, the locking pin 4 with a first longitudinal area 11 in the first recess 5 added. With one at this first longitudinal area 11 subsequent second longitudinal region is the locking pin 4 in the second recess 6 added.

In the second recess 6 is the locking pin 4 arranged with play. The second recess 6 is therefore formed larger with an inner diameter than the outer diameter of the locking pin 4 , In particular, the locking pin 4 in the axial direction and in the radial direction play relative to the housing 3 on. Also in the circumferential direction, the locking pin 4 prefers a certain amount of play. The second recess 6 is in this embodiment again designed as a cylindrical hole, namely designed as a hole in the form of a blind hole. In principle, it is with regard to the recesses 5 and 6 However, it is also possible to produce these otherwise, for example. As a groove or urformtechnisch when arching the housing 3 or the ring gear 2 already train.

In this context, be on 5 referenced, which illustrates a second embodiment. The second embodiment differs only with respect to the second recess 6 from the first embodiment. The second recess 6 is in the second embodiment directly in a primary molding, namely a casting process, the housing 3 in the case 3 introduced with, so that a machining to form the second recess 6 is avoided. The second recess 6 is open in the radial direction inwards, compared to the 4 of the first embodiment can be seen that thereby in particular Material on the housing 3 can be saved. Alternatively, it is also possible, the second recess 6 to provide as a groove. The locking pin 4 is in turn in the radial direction relative to the housing 3 , ie in particular in the radial outward direction, axially and in the circumferential direction with play in the housing 3 added.

Coming back to the first embodiment, is in 1 and 4 also recognizable that the ring gear 2 in the recording room 9 with a radial play in the housing 3 is arranged. Thus, consciously a radial gap 13 between the case 3 and the ring gear 2 available.

In the axial direction is the ring gear 2 relative to the housing 3 by means of a retaining ring 14 secured. This circlip 14 is formed in the form of a resilient biasing element and is supported in the axial direction on one of the end face 10 axially facing away from the ring gear 2 from. The circlip 14 is in a circumferentially extending retaining groove 15 engaged. With his front side 10 is the ring gear 2 again at a radial shoulder 16 of the housing 3 immediately. Thus, the ring gear 2 in the axial direction between the heel 16 and the circlip 14 safely held axially.

With regard to the materials, it is preferred that the housing 3 made of a light metal, such as an aluminum alloy here. As a manufacturing process for the housing 3 Thus, a casting process, particularly preferably an injection molding process, offers itself. The ring gear 2 is preferably made of a steel material / a steel alloy. Also the locking pins 4 are preferably made of a steel material.

In other words, the components - housing 3 and ring gear 2 - by cylindrical pins 4 connected with each other. For this are pens 4 in one of the components 2 pressed in at the front. In the second component 3 are holes according to the first embodiment 6 brought in. In these holes 6 grab the pins 4 , which in the first component 2 are pressed, one.

LIST OF REFERENCE NUMBERS

1

planetary gear

2

ring gear

3

casing

4

locking pin

5

first recess

6

second recess

7

press fit

8th

internal gearing

9

accommodation space

10

front

11

first longitudinal area

12

second longitudinal area

13

gap

14

circlip

15

retaining groove

16

paragraph

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been 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.

Cited patent literature

• DE 102013224499 A1 [0002]

Claims (8)

Planetary gear (1) with a ring gear (2) and a non-rotatably connected to the ring gear (2) component (3), characterized in that the ring gear (2) is secured against rotation relative to the component (3) via a locking pin (4), wherein the locking pin (4) directly in a first recess (5) on the part of the ring gear (2) and directly in a second recess (6) is supported by the component (3). Planetary gear (1) to Claim 1 , characterized in that the locking pin (4) in one of the two recesses (5, 6) via a press assembly (7) is held and in the other of the two recesses (5, 6) in a radial direction and / or in an axial Direction game has. Planetary gear (1) to Claim 1 or 2 , characterized in that the first recess (5) is formed as a cylindrical hole. Planetary gear (1) according to one of Claims 1 to 3 , characterized in that the first recess (5) is formed as a bore. Planetary gear (1) according to one of Claims 1 to 4 , characterized in that the second recess (6) is formed as a cylindrical hole. Planetary gear (1) according to one of Claims 1 to 5 , characterized in that the second recess (6) is formed by forming technology. Planetary gear (1) according to one of Claims 1 to 6 , characterized in that the ring gear (2) in the radial direction with play in the component (3) is accommodated. Drive axle for a motor vehicle, with a planetary gear (1) according to one of Claims 1 to 7 ,

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