DE102021200579B3 - Parking lock arrangement with a compensating element - Google Patents

Abstract

Parking lock arrangement (1) for a motor vehicle, comprising a first shaft segment (2), a second shaft segment (3), the second shaft segment (3) being at least partially hollow and thus having a cavity, the first shaft segment (2) being partially in the cavity of the second shaft segment (3), a lockable parking lock wheel (4), wherein the parking lock wheel (4) is arranged on the first shaft segment (2) in a rotationally fixed manner, wherein in the area of the cavity between an outer surface (5) of the first shaft segment (2 ) and an inner surface (6) of the second shaft segment (3) at least between an elastic compensating element (7) is arranged, wherein the compensating element (7) has a rectangular, circular, triangular, polygonal or U-shaped cross-section.

Description

field of invention

The present invention relates to a parking lock arrangement for a motor vehicle, comprising a first shaft segment, a second shaft segment, the second shaft segment being at least partially hollow and thus having a cavity, the first shaft segment being partially arranged in the cavity of the second shaft segment, and a lockable Parking lock wheel, wherein the parking lock wheel is arranged in a rotationally fixed manner on the first shaft segment, at least one elastic compensating element being arranged in the region of the cavity between an outer surface of the first shaft segment and an inner surface of the second shaft segment.

State of the art

With regard to ensuring that a motor vehicle remains in the parked position, systems that prevent unwanted movement of the parked motor vehicle must be integrated, particularly in “e-drive” applications, i.e. with at least partially electrified motor vehicle drive trains. These systems are usually summarized under the term "parking lock". Regardless of the type of drive unit in a motor vehicle, i.e. whether it is an internal combustion engine and/or an electric machine, the load on all machine elements of the motor vehicle drive train when a parking lock is activated poses a major challenge, particularly with regard to function and safety. In order to avoid damage to the motor vehicle drive train , mechanical precautions must be taken to effectively protect the machine elements of the motor vehicle drive train.

From the DE 101 43 386 A1 a parking lock with a ratchet wheel is known, the ratchet wheel being connected to a shaft via an elastic element.

The Post-Released DE 10 2020 201 729 A1 shows a parking lock wheel, with an inner first component, wherein the first component is designed ring-shaped, and wherein the first component is arranged on a transmission shaft; an outer second component, the second component being annular in shape, and the second component having a plurality of grooves on a radially outer side of the parking lock gear, the grooves being formed such that a pawl can be engaged with the grooves; and a connecting device formed of an elastic material, wherein the first component is coupled to the second component by means of the connecting device.

DE 10 2019 209 470 A1 discloses a parking lock arrangement with a parking lock wheel, a pawl and an actuating device, with a damping element being arranged between the parking lock wheel and a shaft element, with the damping element being arranged in a region of a driving contour between the parking lock wheel and the shaft element, whereby the parking lock wheel and the shaft element move from a central position are rotatable against each other to an end position by an angle of rotation α.

DE 10 2013 204 174 A1 shows a vehicle with a drive train, a parking lock arrangement which has a ratchet wheel connected to a rotatable component of the drive train and a pawl which can be engaged in recesses of the ratchet wheel, the ratchet wheel being a component composed of at least two different materials.

Summary of the Invention

It is an object of the invention to specify a parking lock arrangement that is improved in particular with regard to dynamic load shocks.

This need can be met by the subject matter of the present invention according to independent claim 1. Advantageous embodiments of the present invention are described in the dependent claims.

The parking lock arrangement for a motor vehicle according to the invention comprises a first shaft segment, a second shaft segment and a lockable parking lock wheel. The function of a parking lock with a parking lock wheel in which a parking lock pawl can engage in a locking manner is well known to those skilled in the art and is therefore not discussed further.

According to the present invention, the parking lock wheel is arranged in a rotationally fixed manner on the first shaft segment.

According to the invention, the second shaft segment is at least partially hollow, ie at least partially designed as a hollow shaft, and thus has a cavity.

According to the invention, the first shaft segment is partially arranged in the cavity of the second shaft segment.

Furthermore, according to the invention, in the area of the cavity between an outer surface of the th shaft segment and an inner surface of the second shaft segment arranged at least one elastic compensating element, wherein the compensating element has a rectangular, circular, triangular, polygonal or U-shaped cross-sectional shape.

The compensation element provided is used to eliminate peak loads. Due to its design according to the invention, on the one hand there are no disadvantageous installation space conditions and on the other hand it can be designed exactly for the predetermined maximum activation speed of the parking lock, which is noticeable, among other things, in a cost reduction of the parking lock arrangement.

The damping rate between the first shaft segment and the second shaft segment is decisively influenced by the geometric cross-sectional shape of the compensating element. The reason for this lies in the variation in the section modulus depending on the cross-sectional shape of the compensating element. Depending on the design of the cross-sectional shape of the compensating element (e.g. rectangle, circular, triangle, polygon, U-shape), the damping rate can be increased. This makes it possible to produce a particularly cost-effective parking lock arrangement, since only a small amount of damping material is required for the compensating element, because a large part of the damping capacity is determined by the geometry.

The contour of the outer surface of the first shaft segment and/or the contour of the inner surface of the second shaft segment preferably corresponds to the cross-sectional shape of the compensating element.

Furthermore, the compensating element is preferably made at least partially from at least one elastic material.

This elastic material is preferably an elastomer.

character list

• 1 zeigt schematische Darstellung eines Querschnitts entlang einer Längsachse einer Parksperrenanordnung entsprechend einer ersten Ausführungsvariante.
• 2 zeigt eine schematische Darstellung eines Querschnitts senkrecht zu einer Längsachse einer Parksperrenanordnung entlang der Schnittebene A-A gemäß.
• 3 zeigt schematische Darstellung eines Querschnitts entlang einer Längsachse einer Parksperrenanordnung entsprechend einer zweiten Ausführungsvariante.
• 4 zeigt eine schematische Darstellung eines Querschnitts senkrecht zu einer Längsachse einer Parksperrenanordnung entlang der Schnittebene B-B gemäß 3.

The invention is described below by way of example with reference to the drawings.

• 1 shows a schematic representation of a cross section along a longitudinal axis of a parking lock arrangement according to a first embodiment variant.
• 2 shows a schematic representation of a cross section perpendicular to a longitudinal axis of a parking lock arrangement along the section plane AA according to FIG.
• 3 shows a schematic representation of a cross section along a longitudinal axis of a parking lock arrangement according to a second embodiment variant.
• 4 shows a schematic representation of a cross section perpendicular to a longitudinal axis of a parking lock arrangement along the section plane BB according to FIG 3 .

Detailed description of the invention

1 and 2 each show a schematic representation of a first embodiment variant of a parking lock arrangement 1 according to the invention. 3 and 4 each show a schematic representation of a second embodiment variant of a parking lock arrangement 1 according to the invention.

The parking lock arrangement 1 according to the first variant as well as the second variant has a first shaft segment 2 and a second shaft segment 3 . The first shaft segment 2 as well as the second shaft segment 3 are arranged coaxially and can be rotated about an axis of rotation. The axis of rotation corresponds to a longitudinal axis 8 of the parking lock arrangement 1.

The first shaft segment 2 and the second shaft segment 3 partially overlap in the axial direction. For this purpose, the second shaft segment 3 is at least partially hollow, ie at least partially as a hollow shaft with a cavity, and the first shaft segment 2 is partially arranged in the cavity of the second shaft segment.

The indication of direction "axial" describes a direction along or parallel to the longitudinal axis 8 of the parking lock arrangement 1.

Furthermore, the parking lock arrangement 1 has a lockable parking lock wheel 4 .

The parking lock gear 4 is arranged on the first shaft segment 2 in a rotationally fixed manner, specifically in the area of the first shaft segment 2 that does not overlap with the second shaft segment 3 .

In the area of the cavity, i.e. in the overlapping area of the first shaft segment 2 and the second shaft segment 3, at least one elastic compensating element 7 is arranged between an outer surface 5 of the first shaft segment 2 and an inner surface 6 of the second shaft segment 3. The first shaft segment 2 and the second shaft segment 3 are radially connected via the compensating element 7 . The first shaft segment 2 and the second shaft segment 3 therefore do not have a common contact surface, but are each connected to the compensating element 7 .

The indication of direction "radial" describes a direction normal to the longitudinal axis 8 of the parking lock arrangement 1.

The compensating element 7 can have different cross-sectional shapes in a cross section perpendicular to the longitudinal axis.

At the in 1 and 2 illustrated first embodiment variant of the parking lock arrangement 1, the compensating element 7 has a triangular cross-sectional shape ( 2 ). The contour of the outer surface 5 of the first shaft segment 2 is corresponding in cross section 2 essentially circular and the contour of the inner surface 6 of the second shaft segment 3 is adapted to the cross-sectional shape of the compensating element 7, i.e. triangular ( 2 ).

At the in 3 and 4 The second embodiment variant of the parking lock arrangement 1 shown here uses two compensating elements 7 arranged axially one behind the other. Both compensating elements 7 have a U-shaped cross-section ( 4 ) and are rotated by 180° to one another in the area of the cavity, ie in the overlapping area of the first shaft segment 2 and the second shaft segment 3. The contour of the outer surface 5 of the first shaft segment 2 is corresponding in cross section 4 essentially circular and the contour of the inner surface 6 of the second shaft segment 3 is adapted to the cross-sectional shape of the two axially one behind the other, rotated by 180° relative to one another, the compensating elements 7, in this case therefore being quadrangular.

Reference List

1

parking lock arrangement

2

First wave segment

3

Second wave segment

4

parking lock wheel

5

Outer surface of the first shaft segment

6

Inner surface of the second shaft segment

7

compensation element

8th

Longitudinal axis (of the parking lock assembly)

9

Inner surface of the parking lock gear

Claims (4)

Parking lock arrangement (1) for a motor vehicle comprising - a first shaft segment (2), - a second shaft segment (3), the second shaft segment (3) being at least partially hollow and thus having a cavity, the first shaft segment (2) being partially arranged in the cavity of the second shaft segment (3), - a lockable parking lock wheel (4), the parking lock wheel (4) being arranged in a rotationally fixed manner on the first shaft segment (2), with the area of the cavity between an outer surface (5) of the first shaft segment (2) and an inner surface (6) of the second Shaft segment (3) at least one elastic compensating element (7) is arranged, wherein the compensating element (7) has a rectangular, circular, triangular, polygonal or U-shaped cross-section. Parking lock arrangement (1) according to claim 1 , wherein the contour of the outer surface (5) of the first shaft segment (2) and / or the contour of the inner surface (6) of the second shaft segment (3) correspond to the cross-sectional shape of the compensating element (7). Parking lock arrangement (1) according to claim 1 or 2 , wherein the compensating element (7) is at least partially made of at least one elastic material. Parking lock arrangement (1) according to claim 3 , wherein the compensating element (7) is at least partially made of an elastomer.

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