DE102010050561A1 - Eccentric core for gear in steering system of motor vehicle, has body axis and vertical axis that runs parallel and adjacent to body axis, where body unit is centrically arranged at body axis - Google Patents

Abstract

The eccentric core (20) has a body axis (A1) and a vertical axis (A2) that runs parallel and adjacent to body axis. A body unit (201) is centrically arranged at the body axis and another body unit (202) is centrically arranged at the body axis and adjacent to the former body unit. A rod (203) is provided for connecting the two body units. The eccentric core has a passage (209) that is arranged centrally on a vertical axis. An independent claim is also included for a gear has a longitudinal shaft.

Description

The invention relates to an eccentric sleeve, by means of which a shaft is to be positioned variably in position, and a transmission, a steering system and a motor vehicle with this eccentric sleeve.

It is known to make the position of machine elements variable by means of eccentrically shaped discs, thereby being able to tension, for example, a belt drive in steering systems.

So goes out of the DE 103 10 492 A1 a power steering system, which is intended to allow a simple, inexpensive and standard assembly especially for motor vehicles with a belt and pulley transmission. For this purpose, the power steering on a steering housing, an electric motor and a push rod for deflecting vehicle wheels. An output shaft of the electric motor and the push rod are each connected to a pulley. The pulley of the output shaft is drivingly connected to the pulley of the push rod by means of a belt. The electric motor and / or the push rod are mounted by means of an eccentric such that an axial distance between the output shaft and the push rod is variable.

Also the DE 10 2007 008 246 A1 discloses a device for tensioning a belt of an electric steering drive. In this case, a steering housing is provided with a steering shaft and a fixedly connected to the steering shaft pulley. An electric motor with a motor housing and a motor shaft is mounted in an opening of the steering housing. The motor shaft and the steering shaft are parallel to each other. An end portion of the motor shaft protrudes into the steering housing and is provided with a fixedly connected to the motor shaft pulley. The steering shaft pulley is connected to the motor shaft pulley by a belt. Characterized in that the motor housing is mounted by means of its bearing plate in the opening of the bearing housing, the bearing plate has an eccentric neck region and a tightening of the belt by turning the bearing plate relative to the steering housing is feasible, a reduced number of components can be achieved.

The present invention is based on the object to provide a device with which an alignment of a shaft is simplified to the shaft engaging machine elements.

This object is achieved with an eccentric sleeve with the features mentioned in claim 1, a transmission according to claim 4 with this eccentric sleeve, a steering system according to claim 5 with this eccentric sleeve and a motor vehicle according to claim 6.

The eccentric sleeve according to the invention comprises a body axis and a parallel and spaced from the body axis extending hole axis, at least one centric on the body axis arranged first body part and a centric on the body axis and spaced from the first body part arranged second body part and a connecting the first body part and the second body part web , wherein the eccentric sleeve has a centrally arranged on the hole axis passage.

With the eccentric sleeve according to the invention, a component is provided with which it is advantageously possible to store a shaft, hereinafter called the longitudinal shaft, in a housing in different positions and thus the distance of the longitudinal shaft within fixed limits to other, stationary to the housing arranged elements defined to vary that the eccentric sleeve is arranged in different installation angles with the body axis as the center.

The eccentric sleeve according to the invention is available with the at least two body parts for receiving at least two bearings of the longitudinal shaft, which can thus be advantageously aligned synchronously.

Since the at least two body parts are connected by a web, it is advantageously possible in the region of the web to engage the longitudinal shaft with other elements, referred to below as transverse elements.

The eccentric sleeve according to the invention also distinguishes a robust design and a compact design. It can advantageously be produced inexpensively in one piece as a turned part or milled part. Since the eccentric sleeve according to the invention is ready for receiving a plurality of bearings of the longitudinal shaft, separate Lagereinfassungen can be avoided and the number of parts can be reduced.

In addition, the eccentric sleeve according to the invention can advantageously be prefabricated separately with roller bearings as an assembly, pre-greased and related to stand by for a quick and easy installation in a transmission. It is thus advantageously suitable for price-sensitive large-scale productions.

In a preferred embodiment of the eccentric sleeve according to the invention it is provided that a collar is formed on the first body part or the second body part.

Hereby advantageously a better ease of installation of the eccentric sleeve is provided, as with the collar in interaction with a module-side counterpart, such as a housing, a stop point can be generated by the eccentric sleeve in the longitudinal direction is clearly positioned in the assembly.

In a further preferred embodiment of the eccentric sleeve according to the invention it is provided that the collar comprises a bend having a radius exhibiting slot, wherein the center of the radius is located on the body axis.

This is advantageous in a simple manner, a stepless fixing of the eccentric sleeve in different positions possible, for example with a screw as a fastener and a corresponding threaded hole in the housing of the module. The eccentric sleeve is thus secured in a simple manner against displacement in the longitudinal direction and against rotation in the radial direction.

Against a rotation in the radial direction according to the invention also a non-circular configuration of the lateral surface of the eccentric sleeve is possible. By a symmetrical in cross section shape, the possibility of different installation angle would be maintained.

The eccentric sleeve according to the invention is preferably integrated in all the above embodiments in a transmission, with a mounted in at least one floating bearing and a bearing and with a transverse element between the movable bearing and the fixed bearing engaged longitudinal shaft, wherein the floating bearing and the fixed bearing are arranged in the eccentric sleeve , Preferably, each bearing of the longitudinal shaft is housed in each case in a body part of the eccentric sleeve.

The transverse elements can be arranged longitudinally or preferably transversely to the longitudinal shaft. The longitudinal shaft and the transverse element have mutually corresponding force transmission elements, such as gears on.

With the transmission according to the invention, it is advantageously possible to realize different teeth with a unit housing at a predetermined center distance of the transverse element and the longitudinal shaft and also provides the transmission according to the invention additional possibilities to set a game of teeth.

The longitudinal shaft and the transverse element may be formed, for example, as spur gearing, conical gearing, helical gearing, crown gearing or preferably as worm gearing. The longitudinal shaft is preferably a worm shaft and the transverse element is a toothed rack arranged transversely to the worm shaft, wherein a rotational movement of the longitudinal shaft can be converted into a translatory movement of the rack.

The transmission according to the invention is preferably arranged in a steering system of a motor vehicle, wherein the transverse element is a rack and the longitudinal shaft is a steering shaft. The aforementioned advantages of the transmission according to the invention as an assembly thus benefit the steering system with the transmission as a component.

Further preferred embodiments of the invention will become apparent from the remaining, mentioned in the dependent claims characteristics.

The invention will be explained below in embodiments with reference to the accompanying drawings. Show it:

1 an inventive transmission in a sectional view;

2 the transmission according to the invention in a front view;

3 a detailed view of a longitudinal shaft bearing of the transmission according to the invention;

4 the eccentric sleeve and

5 the eccentric sleeve according to the invention in a plan view:
In 1 is exemplary and not limiting an inventive transmission 10 a steering system according to the invention shown in a sectional view. In the transmission 10 this is a steering gear. The gear 10 is in a gearbox 16 arranged. The gear 10 converts a rotational movement of a longitudinal shaft 12 in a translational movement of a transverse element 14 around. The longitudinal shaft 12 is formed in the steering system according to the invention by a steering shaft and can be brought into operative connection via a steering column, not shown, with a steering wheel, not shown, of a motor vehicle. The cross element 14 is formed in the steering system according to the invention by a rack and can be brought via an unillustrated steering linkage with non-illustrated steerable wheels of the motor vehicle in operative connection. Thus, predetermined by the driver of the motor vehicle steering wheel rotation angle in a defined Radeinschlag the steerable wheels of the motor vehicle.

The longitudinal shaft 12 is in a floating warehouse 22 and a camp 24 stored. In an area between the floating bearing 22 and the camp 24 stands the longitudinal shaft 12 with the cross element 14 engaged. The longitudinal shaft 12 and the cross member 14 are in 1 arranged substantially on two mutually perpendicular planes. The longitudinal shaft 12 and the cross member 14 in this case have mutually corresponding force transmission elements, preferably gears, on. The cross element 14 is additionally by means of a pressure piece 18 with a certain force in the direction of the longitudinal shaft 12 applied.

The floating bearing 22 and the camp 24 are in an eccentric sleeve 20 arranged by means of a fastener 26 , For example, a screw on the transmission housing 16 is fixed. A game between the longitudinal shaft 12 and the cross member 14 is through the pressure piece 18 and the eccentric sleeve 20 influenced.

The camp 24 is through a bearing inner ring clamp 28 and a bearing outer ring clamp 30 fixed. A sealing plug 32 closes the gearbox 16 behind the longitudinal shaft 12 ,

2 shows the transmission according to the invention 10 as a steering gear in a front view. Transverse to the image plane protrudes the longitudinal wave 12 as a steering shaft from the gearbox 16 out. The attachment of the eccentric sleeve 20 by means of the fastening means 26 can be seen. The rack as a cross element 14 lies in the picture plane.

In 3 is a detail view of a longitudinal shaft bearing of the transmission according to the invention 10 shown. The eccentric sleeve 20 is in 3 as a prefabricated assembly including the floating bearing 22 and the camp 24 and the fastener 26 displayed. This assembly is pre-greased ready for assembly of a gearbox in mass production.

According to the invention, the eccentric sleeve 20 also other body parts corresponding to the first and the second body part 201 and 202 have to accommodate more bearings.

The eccentric sleeve 20 as a single component is in 4 illustrated by way of example and not limitation. The eccentric sleeve 20 Here, essentially has the shape of a straight cylinder with a longitudinally extending through the cylinder, eccentrically arranged cylindrical passage 209 ,

The eccentric sleeve according to the invention 20 includes a first body part 201 and a second body part 202 , The first part of the body 201 and the second part of the body 202 are both centrally arranged with a certain distance on a common body axis A1. The first part of the body 201 is in 4 over the second part of the body 202 positioned. Connected to each other are the first body part 201 and the second part of the body 202 over a footbridge 203 ,

The jetty 203 is in a middle area 207 the eccentric sleeve 20 provided and encloses in contrast to the first and second body part 201 and 202 no room. The eccentric sleeve 20 is therefore in the middle range 206 provided with an opening transverse to the body axis A1. The first part of the body 201 and the second part of the body 202 enclose at least as much space as is necessary to surround the bearings. In 4 show the first part of the body 201 and the second part of the body 202 a closed circular cross-section of the outer wall 207 on.

The jetty 203 is formed so that it is an interaction of the power transmission elements of a longitudinal shaft 12 , For example, a steering shaft, and a cross member 14 , For example, a rack, not affected. The jetty 203 is therefore as narrow as possible, to a wide adjustment of the eccentric sleeve 20 to ensure that it can be twisted over a large angle, without the bridge 203 against the cross member abuts. The jetty 20 is thus in installed condition of the eccentric sleeve 20 essentially on a cross element 14 opposite side of the longitudinal shaft 12 positioned.

At a rotation of the eccentric sleeve 20 the hole axis A2 is rotated about the body axis A1. To a point or an axis outside the eccentric sleeve 20 thus varies the distance of the hole axis when turning the eccentric sleeve 20 around the body axis A1. In the installed state through the eccentric sleeve arranged through the longitudinal shaft 12 has as a central axis or axis of rotation also the hole axis A2. By a rotation of the eccentric sleeve 20 This allows the distance between the longitudinal axis 12 and a cross member 14 outside the eccentric sleeve 20 to be changed.

In the illustrated embodiment, all points point to an outer wall 207 the eccentric sleeve 20 the same distance to the body axis A1. According to the invention, the outer wall 207 Also have surveys or be formed in cross-section as a polygon. In addition, it is also conceivable that the outer wall 207 on the first part of the body 201 has a different geometry than on the second body part 202 , In an embodiment of the outer wall 207 as a polygon would be an installation of the eccentric sleeve 20 in fixed predetermined installation angles gradually possible.

Parallel to the body axis A1, the eccentric sleeve 20 the hole axis A2. The hole axis A2 is eccentric to the first and second body part 201 and 202 arranged. Centric, along the hole axis A2, the eccentric sleeve 20 a passage 209 over the entire length of the eccentric sleeve 20 on. The passage 209 is preferably circular to accommodate ball bearings or bearings with a circular bearing outer ring. This can be the passage 209 have different diameters and be provided with paragraphs to create a positive connection with the male bearings in a longitudinal direction.

It is essential that the passage 209 through the passage 209 arranged longitudinal shaft 12 not touched and thus hampered in their rotational ability. Accordingly, it is envisaged that the bridge 203 not in the passage 209 protrudes.

According to the invention, the arrangement of further body parts and webs is possible. It is essential that the webs are arranged so that an engagement of the longitudinal shaft 12 is not hindered with other machine elements. So it is not necessary that all webs are arranged at the same point of the circumference. Also, several webs can connect two body parts together.

The cross section of the eccentric sleeve 20 is in a plan view in 5 shown. The body axis A1 is arranged at a certain distance from the hole axis A2. Both axes A1 and A2 are perpendicular to the image plane of 5 and are therefore shown as a dot.

The body axis A1 forms the center of the circular cross section of the outer wall 207 and the hole axis A2 forms the center of the circular inner wall 207 or the passage 209 , The inner wall 208 points in 5 two different diameters. It is provided with a paragraph.

That too in the collar 204 arranged arcuate slot 205 has the body axis A1 as the center of the radius of its arc. Alternatively, instead of the long hole 205 Also, a plurality of individual bores may be arranged on a circular arc about the body axis A1. A fixation of the eccentric sleeve 20 would then be possible in predetermined stages whose number corresponds to the number of holes. In addition, it is inventively provided, alternatively, a fixation of the eccentric sleeve 20 by a corresponding profile in the collar 204 to enable.

LIST OF REFERENCE NUMBERS

10

transmission

12

longitudinal wave

14

crossmember

16

gearbox

18

Pressure piece

20

eccentric

201

first part of the body

202

second body part

203

web

204

collar

205

Long hole

206

the central region

207

outer wall

208

inner wall

209

passage

22

movable bearing

24

fixed bearing

26

fastener

28

Bearing inner ring clamping means

30

Bearing outer ring clamping means

32

sealing plug

A1

body axis

A2

hole axis

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 10310492 A1 [0003]
• DE 102007008246 A1 [0004]

Claims (6)

Eccentric sleeve ( 20 ) with a body axis (A1) and a hole axis (A2) extending parallel to and spaced from the body axis (A1), at least one first body part (FIG. 201 ) and one centric on the body axis (A1) and spaced from the first body part (A1) 201 ) arranged second body part ( 202 ) and a first body part ( 201 ) and the second body part ( 202 ) connecting bridge ( 203 ), wherein the eccentric sleeve ( 20 ) arranged centrally on the hole axis (A2) passage ( 209 ) having. Eccentric sleeve according to claim 1, characterized in that on the first body part ( 201 ) or the second body part ( 202 ) a collar ( 204 ) is trained. Eccentric sleeve according to claim 1 or 2, characterized in that the collar ( 204 ) a bend having a radius ( 205 ), wherein the center of the radius lies on the body axis (A1). Transmission ( 10 ) with at least one non-locating bearing ( 22 ) and a fixed warehouse ( 24 ) and with a cross element ( 14 ) between the floating bearing ( 22 ) and the camp ( 24 ) engaged longitudinal shaft ( 12 ), characterized in that the floating bearing ( 22 ) and the camp ( 24 ) in an eccentric sleeve ( 20 ) are arranged according to one of claims 1 to 3. Steering system with a transmission ( 10 ) with at least one non-locating bearing ( 22 ) and a fixed warehouse ( 24 ) and with a cross element ( 14 ) between the floating bearing ( 22 ) and the camp ( 24 ) engaged longitudinal shaft ( 12 ), wherein the transverse element ( 14 ) a rack and the longitudinal shaft ( 12 ) is a steering shaft, characterized in that the floating bearing ( 22 ) and the camp ( 24 ) in an eccentric sleeve ( 20 ) are arranged according to one of claims 1 to 3. Motor vehicle with a transmission ( 10 ) with at least one non-locating bearing ( 22 ) and a fixed warehouse ( 24 ) and with a cross element ( 14 ) between the floating bearing ( 22 ) and the camp ( 24 ) engaged longitudinal shaft ( 12 ), characterized in that the floating bearing ( 22 ) and the camp ( 24 ) in an eccentric sleeve ( 20 ) are arranged according to one of claims 1 to 3.

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