DE102017216950A1 - Transmission of a steering system of a vehicle - Google Patents

Abstract

Proposed is a transmission of a steering system of a vehicle comprising: a worm (1) and a worm wheel (2), wherein the engagement of the worm (1) with the worm wheel (2) results in an engagement region (18), the worm (1 ) is formed globoidisch or as a globoid, wherein the screw (1) is received with at least one bearing in an attachment (19), wherein the attachment (19) is connected to the housing.

Description

State of the art

The present invention relates to a transmission of a steering system of a vehicle. In the prior art globoidisch running screw pinion / screws are known. The document DE 102010027744A1 relates to a worm wheel with a toothing having a globoidic tooth. Such a worm wheel can not be removed axially from a tool, as used for casting or injection molding. Therefore, in the worm wheel, the thickness of the teeth decreases from one end side of the worm wheel to the other end side. The document DE 102013013606A1 discloses a method for producing globoidal screws, wherein the screw to be manufactured by at least one roller with teeth by a translational and / or rotational movement in Walzenachsrichtung and simultaneous rotation of the screw around the screw axis is transformed so that a tooth profile on the screw is formed.

Disclosure of the invention

Globoidisch executed screw pinions / screws are stored without clearance compensation in Schraubradgetrieben. As a result, the set occurring at Kunststoffschraubrad not be compensated because of the rigid running bearings. Setting represents the plastic forming.

One object is therefore to provide globoidisch running screw pinion / screw available that can compensate for a occurring at Kunststoffschraubrad setting.

As a first embodiment of the invention, there is provided a transmission of a steering system of a vehicle, comprising: a worm and a worm wheel, the overlapping of the worm with the worm wheel providing an engagement region, the worm being globoid or globoid; Snail is taken with a bearing in an attachment, wherein the attachment is connected to the housing.

Due to a high transverse rigidity, damage to the worm and / or the worm wheel is prevented by a movement in the direction of the gearing plane / the engagement region / the gearing attack. As a result, a long service life of the transmission is ensured.

Exemplary embodiments are described in the dependent claims.

According to an exemplary embodiment of the invention, a transmission is provided, wherein the attachment is designed such that a movement possibility of the screw out and into the engagement region is made possible.

By allowing a possibility of movement of the screw perpendicular to the engagement surface with the worm wheel, a clean engagement of the worm is made possible in the worm wheel.

In a further embodiment of the invention, a transmission is provided, wherein the screw is at least partially disposed within a sleeve or a tube and / or wherein the sleeve or tube is attached by the attachment such that the attachment is at the height of the engagement region and / or wherein the attachment is arranged tangentially to the engagement region.

An attachment within the area of the engagement region prevents a transverse movement from worm to worm wheel.

The arrangement of the attachment within a tube or a sleeve results in a simple assembly of the transmission to the housing.

According to a further embodiment of the present invention, a transmission is provided, wherein the attachment is connected to a housing in which the transmission is arranged, via a fabric joint and / or a frictional joint and / or a form-fitting joint and / or wherein the attachment as Solid joint or designed as a plain bearing or as a rolling bearing.

In a further embodiment of the invention, a transmission is provided, wherein the worm is spring-biased by means of a torsion bar spring and / or a leaf spring and / or a coil spring and / or a coil spring and / or an elastomer and / or an actuator in the direction of the worm wheel and / or is movable.

According to an exemplary embodiment of the invention, a transmission is provided, wherein the attachment is arranged adjacent to the engagement region.

By adjacent to the engagement area attachment a further increase in the transverse stiffness is achieved. Due to the high rigidity, a transverse movement of the Schraubritzels is as far as possible restricted. In addition, the through Gear deflecting evoked movements of the worm suppressed.

According to a further embodiment of the present invention, a transmission is provided, wherein the central longitudinal axis of the worm and the longitudinal center axis of the worm wheel are at an angle to each other, wherein the angle in the range of 45 ° to 90 ° or -45 ° to -90 °, in particular in the range 60 ° to 90 ° or -60 ° to -90 °, or in particular ± 75 ° or ± 90 °.

The angle is called the Achskreuzwinkel.

According to another embodiment of the present invention, there is provided a transmission, wherein the abutment comprises a first and a second bearing, wherein the first bearing to the second bearing has a distance, wherein the attachment to the housing extends approximately over the distance.

In a further embodiment of the invention, a transmission is provided, wherein the distance corresponds to the longitudinal extent of the screw and / or wherein the first bearing is a movable bearing and / or wherein the second bearing is a fixed bearing and / or wherein the movable bearing and / or Fixed bearings are resilient.

In a further embodiment of the invention, a transmission is provided, wherein the first and / or the second bearing are axially biased.

As a result, a backlash-free storage of the screw is ensured on the worm wheel.

As an idea of the invention can be considered to arrange an elastically suspended bearing point such that a set or a backlash on plastic Schraubrad- flanks is compensated in conjunction with globoid Schraubritzel / screws. According to the invention, the globoidisch trained screw pinion / screws are stored with a fixed bearing and a movable bearing, both bearings are resiliently formed.

Of course, the individual features can also be combined with each other, which can also be partially beneficial effects that go beyond the sum of the individual effects.

list of figures

• 1 Globoidschnecke im Getriebe mit Anfederkonzept,
• 2 die relativen Ebenen des Anfederkonzepts für eine Globoidschnecke,
• 3 eine Schnittdarstellung der Globoidschnecke und des Schneckenrads,
• 4 eine perspektivische Darstellung eines Anfederkonzepts für eine Globoidschnecke,
• 5 eine seitliche Schnittdarstellung des Anfederkonzepts,
• 6 eine Schnecke 1 als Globoid und
• 7 eine globoidisch ausgeführte Schnecke 1.

Further details and advantages of the invention will become apparent from the embodiments illustrated in the drawings. Show it

• 1 Globoid screw in gearbox with springing concept,
• 2 the relative levels of the feathering concept for a globoid snail,
• 3 a sectional view of the globoid screw and the worm wheel,
• 4 a perspective view of a quark concept for a globoid screw,
• 5 a side sectional view of the quiver concept,
• 6 a snail 1 as Globoid and
• 7 a globoidisch executed snail 1 ,

DETAILED DESCRIPTION OF EXEMPLARY EMBODIMENTS

1 shows a schematic representation of a Anfederkonzepts with a globoid screw 1 in a worm wheel 2 engages, with the globoid screw 1 at a floating warehouse 10 is arranged resiliently. A second camp of the Globoidschnecke 1 is as a fixed camp 5 educated. Both bearings are with a spring concept 4 educated. The globoid snail 1 is over a motor shaft 6 with the engine 3 connected.

2 shows the relevant levels of the catcher concept with the level 12 , which represents the connection to a housing. The level 13 , which is formed for example as a leaf spring, represents the attachment to the housing. The plane 14 represents the middle section plane of the worm wheel 2 There are also levels 18a shown as relevant levels of the globoid snail. The level 13 is tangential to the engagement plane of the worm wheel 2 formed with the screw, resulting in a high transverse rigidity. As a result, movement of the screw along the engagement surface is made difficult or prevented. Transverse stiffness is defined by the fact that a movement of the globoid screw or globoid pinion in the x direction is largely avoided or reduced.

3 shows the worm wheel 2 and the globoid snail 1 in a side sectional view with a solid-state joint 9 and a stop 7 , In addition, the lever arm 8th and the tangential force 16 on the snail 1 shown. The solid body joint 9 is located near the meshing engagement / engagement area 18 , so the tangential force 16 is absorbed without bending moment. The solid body joint 9 is therefore the meshing engagement / engagement area 18 adjacent. Advantageously, the attachment 9 the snail 1 made such that the toothing engagement / the engagement area 18 from snail 1 and worm wheel 2 is near the attachment. In the presentation of the 3 the attachment is arranged in particular at z = 0, whereby the addition 9 and the intervention area 18 lie in one plane. The intervention area 18 forms in conjunction with a globoid screw or globoid screw as a circular segment at the level of the pitch circle radii.

The attachment 9 can be designed as a leaf spring. Due to the design of the leaf spring at the height of the intersection of the two pitch circles of the teeth, the lever arm 8th the tangential force 16 in the teeth of the snail 1 reduced. In addition, this avoids bending of the leaf spring about the longitudinal axis. In addition, in a respective transmission housing a stop 7 be provided so that the snail 1 is restricted in their pivoting movement.

4 shows a globoid screw 1 in a perspective view, wherein the globoid screw 1 through a suspension 4 , For example, a leaf spring, on a housing 17 is arranged. The snail 1 can through two rolling bearings inside the tube 20 be stored. The attachment 19 on the housing 17 extends in the axial direction of the screw 1 , Due to this axial expansion, the transverse movements can be kept low, resulting in a high transverse rigidity.

5 shows the same globoid screw 1 in a side sectional view with the attachment 19 by means of a leaf spring 4 , where the snail 1 inside a pipe 20 is arranged and the snail 1 with the worm wheel 2 an engagement surface 18 having.

6 shows a snail 1 - worm wheel 2 Arrangement, the snail 1 is executed as a globoid.

7 shows a snail 1 - worm wheel 2 Arrangement, the snail 1 is executed globoidisch. The difference between a globoid as a snail 1 and a globoid snail 1 can be seen in the fact that the globoid over its entire longitudinal extent a constant distance from the worm wheel 2 this holds true for a globoid snail 1 does not apply. Instead, a globoidisch running snail points 1 an area along its longitudinal extent, which engages the worm wheel 2 stands and two more areas, in front of and behind the first area, which is not engaged with the worm wheel 2 stand.

• • Ein mögliches Zahnflankenspiel kann kompensiert werden.
• • Eine Querbewegung der globoidischen Schnecke/Schraubritzel zum Schneckenrad wird verhindert. Es ergibt sich eine hohe Quersteifigkeit

The described arrangements show in particular the following advantages:

• • A possible backlash can be compensated.
• • A transverse movement of the globoid worm / worm gear to the worm wheel is prevented. This results in a high transverse rigidity

It should be noted that the term "comprising" does not exclude other elements or method steps, just as the term "a" and "an" does not exclude multiple elements and steps.

The reference numerals used are for convenience of reference only and are not to be considered as limiting, the scope of the invention being indicated by the claims.

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 102010027744 A1 [0001]
• DE 102013013606 A1 [0001]

Claims (11)

Transmission of a steering system of a vehicle comprising: a snail (1) and a worm wheel (2), wherein the overlap of the worm (1) with the worm wheel (2) results in an engagement region (18), wherein the worm (1) is globoidisch or as a globoid, wherein the worm (1) with a Bearing is received in an attachment (19), wherein the attachment (19) is connected to the housing. Gearbox after Claim 1 wherein the abutment (19) is designed such that a possibility of movement of the screw (1) out and into the engagement area (18) is made possible. Transmission to one of the Claims 1 or 2 wherein the screw (1) is at least partially disposed within a sleeve (20) or a tube and / or wherein the sleeve (20) or the tube is attached by the attachment (19) such that the attachment (19) on Height of the engagement region (18) is located and / or wherein the attachment (19) is arranged tangentially to the engagement region (18). Transmission according to one of the preceding claims, wherein the attachment (19) is connected to a housing in which the transmission is arranged via a material joint and / or a frictional joint and / or a form-locking joint. Gearbox after Claim 4 , wherein the attachment (19) is designed as a solid-body joint or as a plain bearing or as a rolling bearing. Transmission according to one of the preceding claims, wherein the worm (1) by means of a torsion bar spring, and / or a leaf spring, and / or a coil spring, and / or a coil spring, and / or an elastomer, and / or an actuator in the direction of the worm wheel (2) is spring-loaded and / or is movable. Transmission according to one of the preceding claims, wherein the attachment (19) is arranged adjacent to the engagement region (18). Transmission according to one of the preceding claims, wherein the central longitudinal axis of the screw (1) and the longitudinal center axis of the worm wheel (2) are at an angle to each other, wherein the angle in the range of 45 ° to 90 ° or -45 ° to -90 °, in particular in the range 60 ° to 90 ° or -60 ° to - 90 °, or in particular ± 75 ° or ± 90 °. Transmission according to one of the preceding claims, wherein the attachment (19) comprises a first and a second bearing (5, 10), wherein the first bearing (10) to the second bearing (5) has a distance (21), wherein the attachment (19) extends to the housing approximately over the distance (21). Transmission according to one of the preceding claims, wherein the distance (21) corresponds to the longitudinal extent of the screw (1) and / or wherein the first bearing is a floating bearing (10) and / or wherein the second bearing is a fixed bearing (5) and / or wherein the floating bearing (10) and / or the fixed bearing (5) are resilient. Gearbox after Claim 10 wherein the first and / or the second bearing are axially biased.

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