WO2013029681A1

WO2013029681A1 - Planetary gearing and sliding ring

Info

Publication number: WO2013029681A1
Application number: PCT/EP2011/065084
Authority: WO
Inventors: Harald Martini; Thorsten Biermann
Original assignee: Schaeffler Technologies AG & Co. KG
Priority date: 2011-09-01
Filing date: 2011-09-01
Publication date: 2013-03-07

Abstract

The invention relates to a planetary gearing having at least one sun wheel (1, 2) and at least one planet carrier (3) arranged coaxially and rotatably with respect to the latter, wherein a radial bearing is provided between the sun wheel (1, 2) and planet carrier. The invention furthermore relates to a sliding ring (4) for the sliding mounting of components which are rotatable relative to one another, wherein the sliding ring (4) is formed on at least one integrated spring element so as to be deformable in diameter.

Description

PLANETARY GEARBOX AND SLIDING RING

description

Field of the invention

The invention relates to a planetary gear with at least one sun gear and at least one coaxial and rotatable arranged to this Planet tenradträger. The invention further relates to a sliding ring for sliding bearing of relatively rotatable components.

For example, DE 10 2009 032 286 A1 is concerned with a planetary gear. This has two sun gears, each of which sun gear is engaged with a set of planetary gears, which are supported by a Planetenradtrager. In this case, the sun gears are radially centered by the tooth forces acting during operation in engagement with the planetary gears. A disadvantage of this embodiment is that the centering is not guaranteed in the knot-free state, so that the position of the sun gears can be very far from the radial center position Misalignment between the sun gear and the planetary gear carrier is possible, all of which leads to increased wear and increased noise, especially when large forces are transmitted between planetary gears and sun gears, especially a differential. Summary of the invention

The invention is therefore based on the object in a Planetenradgetrie- and in a slide bearing of the aforementioned type to simplify manufacture and assembly. The object is solved by the features of claim 1 and alternatively by the features of claim 4.

It is proposed to provide a radial bearing in a planetary gear between the sun gear and the planet carrier. In this way, the sun can be centered particularly easy. Disturbances due to misalignments and imbalances due to tooth forces can be safely avoided. In addition, the demands on the manufacturing tolerances of the teeth can be reduced and thereby the manufacturing cost can be reduced. At the same time, it is possible to reduce the center distances between planet gears and sun gear, whereby the space is reduced.

Preferably, the storage space and cost-saving designed as sliding bearing. For slide bearing, at least one sliding ring can be arranged radially between the sun gear and the planet carrier.

It is advantageous if the sliding ring is arranged with slight radial prestress between the sun gear and the planet carrier. In this way, the sun gear centered exactly and the center distances between this and the planetary gears can be precisely determined.

A Sonnenradlagerung on the planet carrier can be achieved in a simple manner in that the sliding ring is disposed on a sun gear on the axially projecting portion and is radially outside with a coaxially arranged to this section on the planet in sliding contact. The slide ring can be arranged, for example, as a slide bushing on an axially protruding hub portion of the sun gear and radially outward with a coaxially arranged guide collar on the planet carrier in sliding contact. There- At the same time, the sliding ring dampens the noise between the sun gear and the guide collar during operation.

According to a further aspect of the invention, a sliding ring for sliding bearing of relatively rotatable components is proposed which is formed on at least one integrated spring element in diameter deformable. As a result, in particular the assembly or the attachment of the sliding ring is facilitated on a component. Thus, by means of an elastic diameter widening or diameter reduction on the sliding ring, a diameter deviation between assembly and insertion diameter caused by a hindrance in the assembly area can be compensated. The slide ring can be pressed on a component simply elastic force and / or positive fit, for example, plugged or postponed. In this way, a particularly easy-to-assemble elastic snap connection for fixing the sliding ring on a component is made possible. For example, the sliding ring can be pulled elastically over a paragraph for mounting to allow him to fix behind the paragraph positively snap easily.

Such a sliding ring can be used particularly advantageously in a planetary gear for the radial mounting of the sun gear on the planet carrier.

Preferably, the spring element has at least one resilient web formed by one or more recesses on the sliding ring. Here, the elasticity of the sliding ring is adjustable in particular by the number of integrated webs and their design, such as web width and size of the recesses.

Another advantage results from the fact that the recesses promote the distribution of lubricant and flow through the sliding ring, in particular the recesses serve at standstill of the sliding ring as a lubricant reservoir in which the lubricant can collect to be redistributed during operation, in particular on the sliding surface , In an embodiment which is optimized in particular with respect to elasticity, lubricant distribution and production costs, the web is formed by two recesses on the sliding ring and has the shape of a right-angled "Z" in the circumferential direction They each terminate a web width spaced from the edge of the ring opposite the respective starting edge Alternatively, other resiliently acting web shapes can be provided, Preferably the sliding ring is made of plastic.

Preferably, a plurality of resilient webs integrated in the slide ring are provided. These are preferably arranged distributed uniformly around the circumference, whereby a uniform as possible elastic training of the sliding ring and a uniform lubricant distribution is achieved on the sliding ring. The webs limit a corresponding number of arc sections on the sliding ring. Preferably, at least one radial projection is formed on each of the radially inner or outer sides of the arc sections, which can engage in one or more complementary recesses on the outer or inner circumference of a component for fastening the sliding ring. For attachment, the sliding ring on a component is simply elastically aufpress-, push-on or pushed until it snaps fixed in the depression / en. The slip ring can be arranged so radially with mounting radially inward and sliding contact radially outside or with attachment radially outside and sliding contact radially inside. In this way, a simple Einschnapfeder suspension is achieved by the sliding ring for mounting in diameter expanded elastically and reduced in the assembled state on the insert diameter or vice versa reduced elastically reduced for mounting in diameter and expanded again in the assembled state to the insert diameter. In a particularly preferred embodiment of the invention, three evenly distributed over the circumference arranged resilient webs are integrated in the slide ring. These limit three arc sections on the sliding ring, on each of whose radial inner sides a circumferential radial projection is formed. A fixation of the sliding ring on a component can be achieved in a simple manner by the fact that on the outer circumference of the component an easily manufacturable annular groove is formed, in which engage the projections on the sliding ring. In a planetary gear so can be easily fixed to the radial Sonneradlagerung the sliding ring in an annular groove on the outer circumference of the projecting hub portion of the sun gear. A, in particular temperature-related, release of the sliding ring on the hub portion is reliably avoided in this way.

The described invention may be preferably used in vehicles, but is not limited thereto.

In a further preferred embodiment of the invention, the planetary gear is designed as a spur gear differential planetary design. In this embodiment, the planet carrier two sets of planet gears, which are each in engagement with a sun gear. In doing so, a planetary wheel of one set meshes with a pianeta wheel of the other set. Preferably, a drive wheel is provided on the planet carrier, via which a power in the spur gear differential is transferable. Each of the sun gears is radially mounted on the planet carrier and at the same time connected to an axle shaft, via which in each case a wheel of a vehicle can be driven. The planet carrier is preferably made in lightweight construction in sheet metal and consists of two housing parts, which can alternatively be carried out in one piece nen. Brief description of the drawings

Further features of the invention will become apparent from the following description and from the drawings, in which an embodiment of the invention is shown in simplified form. Show it:

FIG. 1 is a perspective view of a planetary gear transmission according to the invention,

FIG. 2 shows an enlarged detail from FIG. 1,

FIG. 3 shows a perspective individual view of a sliding ring according to the invention.

Detailed description of the drawings

1 shows a planetary gear according to the invention is shown, which is exemplified as a spur gear differential planetary design. The Stirnraddifferenzial has two output sun gears 1, 2, which are each rotatably connected to a hub via a spline with a stub shaft, not shown, via each of which a wheel of a vehicle is driven. Each of the sun gears 1, 2 is in each case with a set planetary gears 8, 9 in engagement. In this case, a planetary gear 8 of the one set meshes in each case with a planetary gear 9 of the other set. The two planetary gear sets are supported by a common planet carrier 3, which at the same time forms the differential housing and radially outside receives a drive wheel 10 (FIG. 2) via which a drive power can be transmitted to the differential. Sun gears 1, 2 and planet carrier 3 are rotatable relative to one another and arranged coaxially to a central axis 1 1. The planet carrier 3 consists of two housing parts, which are each designed in lightweight construction as sheet metal discs. The sun gears 1, 2 each have, on their sides facing away from each other, an axially projecting hub section designed as a plug neck, in each of which a plug shaft is received for transmitting torques and which at the same time serves to guide. Radially outwardly, the hub portions are each coaxially enclosed by a protruding hollow cylindrical guide collar on the outer sides of the housing parts of the planet carrier 3. In this case, the sun gears 1, 2 are each mounted radially on the guide collar of the planet carrier 3, and consequently on the differential housing. For this purpose, a sliding bearing is provided radially between the hub portions of the sun gears 1, 2 and the guide collar. The slide bearing each consists of a sliding ring 4, which is arranged coaxially between the hub portion and guide collar. The sliding ring 4 is fixedly arranged as a plastic sliding bushing on the hub portion of the sun gear 1, 2 and is radially outward in sliding contact with the guide collar of the Planetenradträgers 3. In this way, the sliding ring 4 also serves as a damping element between the sun gear 1, 2 and differential housing.

For attachment, the sliding rings 4 each have a plurality of sections on the inner circumference slightly radially projecting projections 6 (Figure 2). The projections 6 are formed with a rectangular cross-sectional shape and each engage in a complementary radial annular groove 7 on the outer circumference of the hub portions of the sun gears 1, 2 a. In this way, the slip rings 4 are arranged axially fixed on the hub portions. Here, the seal rings 4 are inserted with slight radial bias between the hub portions of the sun gears 1, 2 and the guide collars of the planet carrier 3. As a result, the center distances between the Sonnenradachsen extending along the central axis 1 1, and the Planetenradachsen 12, 13 can be accurately determined.

FIG. 3 shows the sliding ring 4 in a single view. In the sliding ring 4, three resilient webs 5 are integrated, which are distributed over the circumference uniformly distributed by 120 ° to each other. The webs 5 are each by two In the circumferential direction, the recesses extend in each case from the opposite annular edges and extend offset parallel to the circumferential direction by the web width parallel to each other and are terminated by a web width spaced from the respective starting edge The edges at the ends of the recesses are rounded off in each case in the circumferential direction in order to avoid voltage peaks in the force flow The three webs 5 delimit three arc sections of the same arc length on the sliding ring 4 and are connected integrally at their peripheral ends with one arc section in each case Inner circumference of each arc portion extends centrally between the ring edges a radial projection 6 in the circumferential direction.Thus, three projections 6 are arranged annularly on the inner circumference of the sliding ring 4 and in each case by the three integrated in the sliding ring 4 fed limited webs 6. The projections 6 each extend almost over the entire length of the respective arch portion and end about a web width before the end. The webs 5 serve as a snap-spring, by which the sliding ring 4 is elastically deformable in diameter. In this way, this is the hub portion of the sun gear 1, 2 simply aufpress-, push-on or pushed until the projections 6 snap into the annular groove 7 on the hub portion frictionally and positively. For mounting on the hub portion of the slide ring 4 is elastically expandable to the required mounting diameter and reduced by snapping on the annular groove 7 back to the insert diameter. In this case, the elasticity of the sliding ring 4 in particular by the web width and the width of the recesses in the circumferential direction, variably adjustable. LIST OF REFERENCE NUMBERS

1 sun wheel

2 sun wheel

3 planet carrier

4 sliding ring

5 footbridge

6 lead

7 annular groove

8 planetary gear

9 planetary gear

10 drive wheel

1 1 central axis

12 planetary gear axle

13 planetary gear axle

Claims

claims

1 . Planetary gear with at least one sun gear (1, 2) and at least one coaxial and rotatable planetary gear carrier (3), characterized in that between sun gear (1, 2) and planet tenradträger (3) is provided a radial bearing.

2. planetary gear according to claim 1, characterized in that for sliding bearing at least one slide ring (4) radially between the sun gear (1, 2) and planet carrier (3) is arranged.

3. planetary gear according to claim 1 or 2, characterized in that the sliding ring (4) is arranged on a sun gear (1, 2) axially projecting hub portion and radially outward with a coaxially arranged guide collar on the planet carrier (3) is in sliding contact.

4. Slip ring (4), in particular according to one of claims 1 to 3, for sliding bearing of relatively rotatable components, characterized in that the sliding ring (4) is formed deformable on at least one integrated spring element in diameter.

5. planetary gear or sliding ring (4), according to one of claims 1 to 4, characterized in that the spring element has at least one resilient ridge (5) formed by one or more recess (s) on the sliding ring.

6. planetary gear or sliding ring (4), according to one of claims 1 to 5, characterized in that the web (5) in the circumferential direction has the shape of a right-angled "Z".

7. planetary gear or sliding ring (4), according to one of claims 1 to 6, characterized in that the sliding ring (4) is designed in plastic.

8. planetary gear or sliding ring (4), according to one of claims 1 to 7, characterized in that in the sliding ring (4) a plurality of resilient webs (5) are integrated, which are arranged distributed uniformly over the circumference and a corresponding number of arcuate sections on the sliding ring (4), wherein at least one radial projection (6) is formed on the radially inner or outer sides of the arc sections for fastening the sliding ring (4).

9. planetary gear or sliding ring (4) according to one of claims 1 to 8, characterized in that in the sliding ring (4) three resilient webs (5) are integrated, which are distributed uniformly over the circumference and three arc sections on the sliding ring (4 ), wherein for attachment of the sliding ring (4), the arc sections each have on their radial inner sides a circumferentially extending radial projection (6) and the projections (6) in a complementary annular groove (7) on the outer circumference of the hub portion of the sun gear (1 , 2) intervene.

10. Planetary gear according to one of claims 1 to 9, characterized in that the planetary gear is designed as a spur gear planetary planetary design and the planet carrier (3) has two sets of planet wheels (8, 9), each with a sun gear (1, 2), wherein a planetary gear (8) of one set meshes with a planetary gear (9) of the other set and the planet carrier (3) is drivable via a drive wheel and each of the sun gears (1, 2) each with an axle shaft is connected, each driving a wheel of a motor vehicle.