DE102013209641B4 - Switching device for a change-speed gearbox of a motor vehicle - Google Patents

Abstract

Switching device for a change-speed gearbox of a motor vehicle, which has a switching shaft (2) which can be actuated by means of a shift lever (1), wherein the shift shaft (2) is rotatably mounted in a housing or on a carrier about a first axis of rotation (a), wherein 2) in conjunction with an additional mass (3), wherein the additional mass (3) about a second axis of rotation (b) is rotatably arranged, wherein the transmission of the rotational movement from the shift lever (1) to the additional mass (3) by means of a transmission element (4 ) takes place, in which a toothed portion (5) which is connected to the shift lever (1) and which is rotatably mounted about the first axis of rotation (a), engages in a toothed wheel (6) which is connected to the additional mass (3) and which is rotatably mounted about the second axis of rotation (b), characterized in that the toothed section (5) has two toothing elements which are at least equal in their toothed region and are rotatable about the first axis of rotation (a) ile (5 ', 5' '), wherein the toothing parts (5', 5 '') relative to each other about the first axis of rotation (a) by means of a spring element (7) are elastically biased pivotally arranged, wherein the spring element (7) as axially in the direction of the first axis of rotation (a) effective spring is formed and the two gear parts (5 ', 5' ') are provided with a structure which the two gear parts (5', 5 '') against each other when axially compressing around the first Turn the rotation axis (a).

Description

Field of the invention

The invention relates to a switching device for a change-speed gearbox of a motor vehicle, which has an operable by means of a shift lever, in particular pivotable shift shaft, wherein the shift shaft is rotatably mounted in a housing or on a support about a first axis of rotation, wherein the shift shaft in rotationally fixed connection with an additional mass wherein the additional mass is rotatably disposed about a second axis of rotation, wherein the transmission of the rotational movement from the shift lever to the additional mass by means of a transmission element, wherein a toothed portion which is directly or indirectly connected to the shift lever and which is rotatably mounted about the first axis of rotation is, engages in a gear which is directly or indirectly connected to the additional mass and which is rotatably mounted about the second axis of rotation.

Background of the invention

A generic switching device is for example from the FR 2 803 252 A1 or from the EP 1 710 475 A1 known. The EP 1 116 902 B1 shows a similar solution, also the WO 2007/137895 A1 , In a circuit of a car transmission is always a certain inertia desired in the switching direction to improve the shifting comfort and the shift feeling. The solutions mentioned allow this.

In the simplest case additional weights are used, which are moved without translation in the same ratio to the switching path. The above-mentioned solutions represent an advanced solution in that, for the purpose of weight optimization, a gear ratio is provided for the movement of the additional weights. Here, a transmission element is used, which moves the additional mass in relation to the movement of the shift lever faster and thus increases the inertia effect. Thus, even when using a relatively small additional mass of the desired increased inertia effect can be achieved.

In the above solutions, there are various ways to couple the additional mass to the switching system. The concept in question is based on the fact that a gear wheel, which is connected to the shift lever, a gear is driven, which is connected to the additional mass. Between the gear segment and the gear while such a translation can be realized that the effect of the inertia of the additional mass generates the desired effective size on the shift lever.

In the aforementioned generic solution according to the FR 2 803 252 A1 it is disadvantageous that the gear teeth used, which connect the additional mass with the shift lever as a transmission elements, are subject to play, which inevitably results due to the backlash. This has adverse consequences in terms of the desired high shifting comfort, since it can cause a tingling or vibration in the shift lever.

Object of the invention

The present invention has for its object to provide a generic switching device so that in this regard remedy. Accordingly, the shift comfort is to be increased by a comfortable and play-free use of the additional mass is realized.

Summary of the invention

The solution of this problem by the invention is characterized in that the toothed section has two at least in their toothed region largely identically formed, rotatably disposed about the first axis of rotation toothing parts, wherein the toothed parts are arranged relative to each other about the first axis of rotation biased by a spring element pivotable.

The spring element generates an elastic pivoting between the two gear parts, so that the game can be taken out of the toothing with the gear of the additional mass.

The spring element is formed according to a first preferred embodiment of the proposed arrangement as a torsion spring, which is arranged effectively between the two teeth parts. The spring element can engage with two end regions in recesses in the two toothing parts, wherein the recesses are arranged away from the first axis of rotation.

The two toothed parts are preferably formed as flat components, in particular as flat sheet-metal parts, which - seen in the direction of the first axis of rotation - have a substantially identical shape.

Another embodiment of the invention provides that the spring element is designed as an axially effective in the direction of the first axis of rotation spring, wherein the two gear parts are provided with a structure which rotate the two gear parts against each other during axial compression about the first axis of rotation.

The spring element is preferably designed as a plate spring or cup spring package. The said structure may comprise at least one projection in one of the two toothed parts, which engages in at least one recess in the other of the two toothed parts. The at least one projection and the at least one recess preferably have mutually congruent cooperating surfaces. In particular, it is provided that the at least one projection and the at least one recess have ramp-shaped cooperating surfaces. In this case, a number of ramp-shaped interacting surfaces may be arranged around the first axis of rotation.

The transmission element for transmitting the movement of the shift lever to the additional mass and namely the toothing of the transmission element is thus formed according to the invention by two toothed parts, which are preferably realized as two mutually offset elements. These elements are resiliently biased in meshing engagement so that they can bridge the gearing clearance to an extent encompassing all expected manufacturing tolerances.

In an advantageous manner, an exact or desired friction behavior in the connection or in the transmission element can be adjusted by the height of the spring preload.

The inner shift lever (toothed portion of the transmission element) is thus divided into two independently rotatable elements that can be rotated relative to each other via a spring element. Both levers (gearing parts) are mounted about a common axis. One of the two levers (gearing parts) is firmly connected to the shaft and can transmit a torque; the other lever (toothing part) is elastically braced against this.

The two gear parts are either directly preferably biased against each other by a leg spring or by a ramp profile with a disc spring so that the teeth are slightly offset from each other. If the toothed portion with the two toothed parts between the shift lever and the gear, with which the additional mass is connected, now driven, the tooth flanks of the gear to the two lever edges (ie, to the edge of the teeth of the teeth parts) and press the backlash against the Spring force from the connection.

Advantageously, it can be achieved with the proposed embodiment that complete backlash is present in the toothing, via which the additional mass is driven by the shift lever. Accordingly, the tendency for vibrations in the shift lever is reduced and thus a higher shift comfort when operating the switching device is achieved.

In general, the clearance compensation described can also be realized in the toothed section in the toothed wheel, which is connected to the additional mass. Then the toothed portion would only be made in one piece and would mesh with the gear, which would then have two relatively pivotable gear sections, which can be pivoted against each other spring biased.

Brief description of the figures

In the figures, embodiments of the invention are shown. Show it:

1 in a perspective view a part of a switching device of a motor vehicle gear change transmission, from which the basic structure of the device according to the invention can be seen,

2 in a perspective view of a part of the switching device according to 1 showing a first embodiment of the invention,

3 the top view of the part according to 2 .

4 the sectional side view of the part according to 2 .

5 an enlarged section of the illustration according to 3 showing the meshing teeth of the gear part and the gear,

6 in a perspective view of a part of the switching device according to 1 showing a second embodiment of the invention,

7 the sectional side view of the part according to 6 and

8th an enlarged section of the illustration according to 7 , wherein two cooperating ramp-shaped structures are outlined.

Detailed description of the figures

In 1 the general structure of a switching device of a gear change transmission of a car is outlined, with only the components of interest here are shown. The technological background is explicitly on the FR 2 803 252 A1 , the EP 1 116 902 B1 and the WO 2007/137895 A1 referenced where details are included for a generic switching device.

In 1 is a gear lever 1 indicated that in order to carry out a switching operation in the transmission can be rotated about a first axis of rotation a. A switching shaft 2 transmits this rotational movement, but what - as far as the actual switching process - is not sketched. On the contrary, only the arrangement of interest here, via which an additional mass is shown, is shown 3 can be rotated about a second axis of rotation b, the effective moment of inertia of the shift lever 1 to increase the first axis of rotation a.

For this purpose, a transmission element 4 present, which is the rotation of the stem 2 around the first axis of rotation a in a faster rotation of the additional (rotating) mass 3 accomplished around the second axis of rotation b. The transmission element 4 includes a gear section 5 (internal gear lever with toothing), with a gear wheel 6 meshes; the gear 6 is rotatable with the additional mass 3 connected or is part of the same.

A first embodiment of the device according to the invention is in the 2 to 5 shown. It is essential that the gearing section 5 is formed in two parts, that is, it has a first toothing part 5 ' and a second gear part 5 '' that are practical in shape. Both gearing parts 5 ' . 5 '' have the same teeth, but can be pivoted about their common axis of rotation a relative to each other.

Between the two gearing parts 5 ' . 5 '' is a spring element 7 arranged effectively. In the embodiment according to 2 to 5 is the spring element 7 designed as a torsion spring, the two end portions 8th and 9 Has. With these end areas 8th . 9 extends the spring element 7 in slit-shaped recesses 10 in the gearing parts 5 ' . 5 '' ,

During one of the gearing parts 5 '' non-rotatable with the selector shaft 2 is connected, is the other gearing part 5 ' relative to the gearing part 5 '' pivotable, in which case by the spring element 7 an elastic biasing force is generated.

As it is in 5 is indicated, so can by elastic pivoting of the teeth of a toothing part 5 ' against the other gearing part 5 '' the backlash from the meshing with the gear 6 be taken out.

Another embodiment of the invention is in the 6 to 8th shown.

Here comes between the two gearing parts 5 ' and 5 '' a ramp-shaped structure 11 . 12 used to said elastic relative pivoting of the two teeth parts 5 ' . 5 '' to accomplish. For this purpose are in the toothing part 5 ' - s. this best 8th - ramp-shaped projections 11 incorporated in the ramp-shaped recesses 12 in the gearing part 5 '' intervention. The projections 11 or the associated recesses 12 are arranged around the axis of rotation a, as in 7 is indicated.

Be now by the spring element 7 - here in the form of a plate spring - the two gearing parts 5 . 5 '' pressed axially against each other, arises as in the first embodiment, an elastic force which the two teeth parts 5 ' . 5 '' twisted against each other.

This twisting movement is in turn used to the teeth play in the tooth engagement between the parts 5 ' . 5 '' and 6 to eliminate.

In general, the proposed solution can be used not only in motor vehicle transmissions, but in all gear change transmissions, z. As well as industrial gear, but here the comfort aspect when switching is usually subordinate.

LIST OF REFERENCE NUMBERS

1

gear lever

2

shift shaft

3

additional mass

4

gear element

5

toothed section

5

first toothing part

5 ''

second toothing part

6

gear

7

spring element

8th

End region of the spring element

9

End region of the spring element

10

recess

11, 12

structure

11

ramp-shaped projection

12

ramp-shaped recess

a

first axis of rotation

b

second axis of rotation

Claims (9)

Switching device for a change-speed gearbox of a motor vehicle, the one by means of a shift lever ( 1 ) operable switching shaft ( 2 ), wherein the switching shaft ( 2 ) is rotatably mounted in a housing or on a carrier about a first axis of rotation (a), wherein the switching shaft ( 2 ) in conjunction with an additional mass ( 3 ), the additional mass ( 3 ) about a second axis of rotation (b) rotatable is arranged, wherein the transmission of the rotational movement of the shift lever ( 1 ) on the additional mass ( 3 ) by means of a transmission element ( 4 ), in which a toothed section ( 5 ), with the lever ( 1 ) is connected and which is rotatably mounted about the first axis of rotation (a), in a gear ( 6 ) engages with the additional mass ( 3 ) and which is rotatably mounted about the second axis of rotation (b), characterized in that the toothed portion ( 5 ) two at least in their toothed region of the same trained about the first axis of rotation (a) rotatably arranged toothing parts ( 5 ' . 5 '' ), wherein the toothing parts ( 5 ' . 5 '' ) relative to each other about the first axis of rotation (a) by means of a spring element ( 7 ) are arranged elastically biased pivotable, wherein the spring element ( 7 ) is formed as axially in the direction of the first axis of rotation (a) effective spring and the two gear parts ( 5 ' . 5 '' ) are provided with a structure that the two gearing parts ( 5 ' . 5 '' ) during axial compression against each other about the first axis of rotation (a) rotate. Switching device according to claim 1, characterized in that the spring element ( 7 ) is designed as a torsion spring, which between the two toothing parts ( 5 ' . 5 '' ) is arranged effectively. Switching device according to claim 2, characterized in that the spring element ( 7 ) with two end regions ( 8th . 9 ) in recesses ( 10 ) in the two gearing parts ( 5 ' . 5 '' ), wherein the recesses ( 10 ) are arranged away from the first axis of rotation (a). Switching device according to one of claims 1 to 3, characterized in that the two toothing parts ( 5 ' . 5 '' ) are formed as flat sheet metal parts, which have seen in the direction of the first axis of rotation (a) a same shape. Switching device according to claim 4, characterized in that the spring element ( 7 ) Is designed as a plate spring or disc spring package. Switching device according to Claim 1 or 5, characterized in that the structure has at least one projection ( 11 ) in one of the two gearing parts ( 5 ' ), which in at least one recess ( 12 ) in the other of the two gearing parts ( 5 '' ) intervenes. Switching device according to claim 6, characterized in that the at least one projection ( 11 ) and the at least one recess ( 12 ) have mutually congruent cooperating surfaces. Switching device according to claim 7, characterized in that the at least one projection ( 11 ) and the at least one recess ( 12 ) have ramped cooperating surfaces. Switching device according to claim 8, characterized in that a number of ramp-shaped cooperating surfaces around the first axis of rotation (a) is arranged around.

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