DE102009057294A1 - Lever device for use in switching dome for damping vibrations of control shaft utilized for transmitting switching and selection movements to transmission of vehicle, has extension section enclosing damper reciprocally and bilaterally - Google Patents

Abstract

The device (4) has an extension section (7) and an interface (5) that is provided for coupling the device with a control shaft (2), where the interface is arranged at the extension section. A vibration damper (6) is arranged at a free end of the extension section that encloses the vibration damper reciprocally and/or bilaterally, where the extension section is formed as a sheet metal construction. The vibration damper is provided with a switching weight and a damper unit. The extension section includes two extension sheet metal plates (11a, 11b) that are connected with one another. An independent claim is also included for a switching dome comprising a control shaft.

Description

Field of the invention

The invention relates to a lever device for vibration damping of a switching shaft with a boom section, with an interface for coupling the lever device with the switching shaft, wherein the interface is arranged on the boom section, and with a vibration damper, wherein the vibration damper is arranged at a free end of the boom section. The invention also relates to a switching dome with this lever device.

When switching devices for transmission, for example, for change-speed gearbox, measures are often taken to apply the switching or dialing with a defined selection or switching power. In addition to the application of such additional forces, however, the damping of unwanted vibrations in the selection or switching process is a relevant aspect in the design of the switching devices.

The publication DE 10 2005 062 170 A1 relates to a shift weight for a transmission with a delivery device and an at least positively connected with the delivery device additional mass. In the document it should be noted that in the prior art such weight bodies are so far designed as one-piece casting weights, that is, the additional mass and the boom on which it is located, are designed as one-piece castings. In the cited document, it is proposed to form the weight body in at least two parts and thus to substitute the one-piece cast body.

The publication FR 29078781 relates to a lever device which can be coupled to a switching shaft and which dampens vibrations via a complex spring-mass device.

The publication DE 600 273 78 T2 , which is believed to represent the closest prior art, relates to a shift lever damper assembly, and more particularly to an arrangement used with respect to a gear lever or shift lever in a motor vehicle. It is proposed a lever assembly with a bridge construction, which is mounted centrally on a shift shaft and each end wearing a rubber-buffered damping element, which are placed on bolts of the bridge.

description

The invention has for its object to provide a lever device for vibration damping a shift shaft, which has improved functionality. This object is achieved by a lever device with the features of claim 1 and by a switching dome with the features of claim 13. Preferred or advantageous embodiments of the invention will become apparent from the dependent claims, the following description and the accompanying drawings.

In the context of the invention, a lever device for vibration damping of a shift shaft is presented. The selector shaft is used to transmit switching and / or Wählbewegungen, especially in transmissions for vehicles, and may be arranged to be pivotable and / or slidable in the direction of its longitudinal extent.

The lever device comprises a boom section, which may be lever-shaped or, in other embodiments, may be an integral part of a more complex component, so that the definition of the boom section is reduced to the functional properties.

The boom section has a mechanical interface for coupling the lever device to the switching shaft, so that the boom section can be secured to the control shaft or optionally to intermediate elements to the control shaft.

Furthermore, the lever device comprises a vibration damper, wherein the vibration damper is arranged at a free end of the boom section. If the boom section is an integral part of a more complex component, then the free end may also be located within the more complex component. The vibration damper is thus positioned at a distance from the interface, so that the vibration damper is guided at a movement of the control shaft spaced from the shift shaft.

Particularly advantageously, the lever device acts in the acceleration and deceleration phase in the context of switching and / or dialing. Often, the lever means is accelerated and abruptly at the end of the trajectory, z. B. by a hard stop, braked so that vibrations are generated in the shift shaft or in the lever device. In this or another abrupt change in speed of the vibration damper can resonate and consume by internal friction, the vibration energy without the vibrations z. B. be passed over a cable or lever in the passenger compartment.

In particular, the lever device is designed so that the initiation of the switching and / or selection movement in the switching shaft on a Power transmission path is carried out, wherein the vibration damper outside of the power transmission path, that is not arranged as a serial member, but preferably as a dead-end member or as a parallel member. In particular, the switching and / or selection movement is transmitted rigidly to the shift shaft. The vibration damper is used in particular for changing and / or damping of resonance frequencies.

In the context of the invention it is proposed that the boom section surrounds the vibration damper on both sides. By a fork or Zangenumgriff the vibration damper, this can be securely fixed so that unwanted vibrations of the vibration are avoided. In particular, free ends of the vibration damper are fixed. Particularly preferably, the vibration damper in its longitudinal extent on both sides, in particular parallel to a pivot axis of the switching shaft, encompassed and held on axial side surfaces. For example, a fastening bolt is provided for fixing the vibration damper, which is guided parallel to the pivot axis and is fastened on two sides to the boom section.

In an advantageous development of the invention, the vibration damper comprises a shift weight and a damper unit. The damper unit is preferably formed from a plastic, in particular an elastomer or from a rubber. The switching weight is preferably made of metal, which has a correspondingly high specific gravity. Shift weight and damper unit are arranged coaxially to each other in preferred embodiments, wherein the shift weight is supported on, in particular exclusively via the damper unit on the boom section. By this construction, the shift weight can vibrate damped. The overall system shift weight and damper unit is tuned as the vibration damper to specific frequencies that can be attenuated by him. Such vibration dampers are often referred to in the art as absorbers or absorbers.

In a preferred embodiment of the invention, the boom section is formed as a sheet metal construction. A sheet metal construction allows a simple and cost-effective connection of the vibration damper to the shift shaft and also allows a torsion and bending stiff design to reduce in connection with the vibration damper the existing vibrations and in addition to generate any new vibrations.

In a preferred constructional embodiment of the invention, the boom section has two cantilever plates which run kinematically parallel between the vibration damper and the interface and / or independently transmit tensile and / or pressure forces from the vibration damper to the interface. In this case, one of the cantilever plates is arranged on one side of the vibration damper and the other of the cantilever plates on the other side of the vibration damper. At the interface, the two boom plates meet, preferably they are there contacting each other.

Due to the kinematically parallel construction of the boom plates, a frame construction with high bending stiffness, in particular with respect to the longitudinal extent of the vibration damper and / or in longitudinal extension of the pivot axis of the lever device is achieved.

With the aim of also increasing the torsional stiffness, it is optionally provided that the cantilever plates have Abkantbereiche which are angled or arranged perpendicular to the longitudinal extent of the boom section. The Abkantbereiche can be designed so that at least one of the cantilever plates, preferably both cantilever plates, are formed cranked. In particular, the Abkantbereiche are formed and / or distributed so that the distance between the cantilever plates in the region of the vibration damper is greater than in the region of the interface. In particular, a combination of the proposed measures leads to a cost-effective implementation of the boom section with high torsional and bending stiffness.

With the aim of reducing assembly and manufacturing costs, it is preferred that the two cantilever plates be releasably connected together. On the side of the vibration damper, the boom plates z. B. via a screw connected to each other, which also serves to attach the shock absorber and thus assumes a dual function. On the side of the interface can be provided that the two cantilever plates are also defined by a screw to each other, which also sets the boom section in the shift shaft, so that here is a double function implemented. In this embodiment, the number of manufacturing steps and the components to be used is minimized and thus reduces the production cost.

In a further development of the invention, a form-fitting connection to the shift shaft is introduced in the interface. In particular, the positive connection serves for a pivot-fixed connection of boom section and switching shaft. For this purpose, it can be provided that one or preferably even both cantilever plates a Positive locking geometry, such as Torx, hexagon, two-flat, etc., and the shift shaft or the intermediate element is formed at the corresponding position complementary thereto.

In an advantageous development of the invention, it is provided that at least one of the cantilever plates has a forming region, in particular a form, at the interface, so that sections of the cantilever plates are spaced apart from one another. By spacing z. B. the structural rigidity of the boom section can be further increased. By implementing the spacing completely, or at least with the assistance of the characteristics, no additional components or fewer additional components that could cause assembly and procurement costs are necessary.

Another advantage is that the space created thereby between the cantilever plates can be used functionally. A development of the invention provides namely that one or the space between the cantilever plates is designed as a selector lever engagement. In this development, the cantilever plates may have widened areas on which a roller, a roller or another coupling element of a selector lever is applied, wherein a shift of the selector shaft in its longitudinal extent via the lever device can be introduced by the selector lever. By integrating the selector lever engagement in the lever device a very compact, space-saving and feature-rich assembly is implemented.

A possible extension of the functions provides that the lever device has a connection section for a switching engagement, in particular for a cable pull or for a shift linkage, in particular for a switch actuator engagement. Optionally, it can thus be provided that both switching and selection movements are transmitted to the selector shaft via the lever device. Particularly preferably, the connection portion is formed integrally with one of the cantilever plates. The boom section may be formed, for example, as a sheet metal zone or a sheet metal area on which an interface such. B. a ball stud is placed or arranged. Instead of a ball stud z. B. an opening area may be provided for a cable.

A further object of the invention relates to a switching dome with the features of claim 13. This switching dome has a lever device, as described above or according to one of the preceding claims, wherein the lever means, in particular the boom section rotatably and / or non-displaceable with the switching shaft connected is. The boom section is arranged in its longitudinal extension radially projecting to the pivot axis of the shift shaft, so that the vibration damper is guided in a switching movement of the shift shaft in the direction of rotation about the pivot axis. It is namely this pivoting movement whose course is to be smoothed by the inertia of the vibration damper.

In a further development of the invention, the shift dome on a selector lever, wherein the selector lever is preferably supported on both sides for the transmission of selection forces on the shift shaft on the boom section, in particular in the axial direction. Thus, the boom section, in particular the cantilever plates, so formed that they can at the same time the selection movement of the selector lever on the shift shaft, so a movement of the switching shafts in the axial direction transmitted.

Further features, advantages and effects of the invention will become apparent from the following description of a preferred embodiment of the invention and the accompanying figures. Showing:

1 a schematic, three-dimensional representation of a switching dome with a lever device as an embodiment of the invention;

2 a cross section through the lever device in the 1 ;

3 a plan view of the lever device in the 1 ,

The 1 shows in a schematic three-dimensional view of a switching dome 1 , which is placed for example on a transmission housing, not shown, and at least the end portion of a switching shaft 2 includes. The shift shaft 2 serves for the transmission of switching and Wählbewegungen, which by a pivoting of the switching shaft 2 around its pivot axis 3 or by a shift of the switching shaft 2 in the direction or along the pivot axis 3 he follows.

After by the pivoting of the switching shaft 2 , Especially in the acceleration or deceleration phases of the shift shaft, undesirable vibrations may occur, the shift dome 1 a lever device 4 on, which is designed, inter alia, for damping these vibrations. The lever device 4 extends in the radial direction to the shift shaft 2 and can be functionally divided into 3 areas: In a first area is an interface 5 for coupling the lever device 4 to the selector shaft 2 intended. At the free end of the lever device 4 is a vibration damper 6 positioned, whose Structure and effect will be described below. interface 5 and vibration absorbers 6 are over a boom section 7 with the shift shaft twisting and sliding fixed, so that during a pivoting movement of the shift shaft 2 - So at a switching movement of the switching shaft - the vibration damper 6 in the circumferential direction about the pivot axis 3 is moved.

The vibration damper 6 is designed as a so-called vibration damper, the structure of which in particular from the 2 gives a detail of a longitudinal section through the pivot axis 3 of the switching dome 1 shows.

The vibration damper 6 comprises, viewed radially from the outside to the outside, first a sleeve 8th , on the coaxial with a damper unit 9 made of a soft plastic, in particular elastomer or rubber. In the radial direction to the outside then closes coaxially and concentrically arranged switching weight 10 which is hollow-cylindrical or annular and consists, for example, of metal. When introducing vibrations into the vibration damper 6 becomes the shift weight 10 vibrated, but the oscillations of the shift weight 10 through the damper unit 9 are attenuated and the vibration energy is dissipated. The vibration damper 6 can also be realized in other known Tilgerbauformen.

The boom section 7 is made of two cantilever plates, namely an upper cantilever plate 11a and a lower cantilever sheet 11b formed, which differ from the interface 5 kinematic extend parallel to each other and at their free ends on both sides or two sides on the vibration damper 6 , rest and especially the sleeve 8th hold positively. As bearing surfaces, the side surfaces in the extension direction of the vibration damper 6 or the sleeve 8th used. In the resting end sections 12a . 12b is a screw connection 13 performed, which coaxial the vibration damper 6 passes. Through the end sections 12a , b and the screw connection 13 becomes the sleeve 8th fixed positive and positive locking, so that unwanted vibrations of the vibration damper 6 are prevented.

In the area of the interface 5 has the upper boom plate 11a a bowl area 14 on whose underside flat on the lower boom plate 11b rests. Both the upper boom plate 11a as well as the lower boom plate 11b have a form-fitting contour 15 on, which - as is clear from the 3 in plan view, toroidal or star-shaped and the one form fit in the direction of rotation with the switching shaft 2 received. The form-fitting connection between the boom section 7 at the interface 5 is through another screw connection 16 secured.

Due to the parallel guidance of the boom plates 11a , b is the boom section 7 in a direction parallel to or against the axis of rotation 3 very rigid. To additionally a rotation about an axis which is radial to the pivot axis 3 is formed and through the vibration damper 6 runs, to prevent, have both the upper boom plate 11a , as well as the lower boom plate 11b several bending areas 17 on whose bending lines are angled or perpendicular to the connecting line pivot axis 3 - Vibration damper 6 in a projection plane acting as a radial plane to the pivot axis 3 is trained, are aligned.

As in the synopsis of the 1 and 3 shows, shows the lower boom plate 11b a connection section 18 which is radially from the interface 5 protrudes and integrally from the lower shelf 11b protrudes. At its free end, the connection section 18 a ball head 19 on, on which a cable or a shift linkage can be hooked to initiate switching movements.

At the connecting section 18 opposite side show the lower and upper boom plate 11a , b one guide area each 20 between which a gap 21 - realized by the cup area 14 - is arranged. In this space 21 takes a role 22 a selector lever 23 , which is articulated so that the selector lever 23 , Role 22 and the boom section 7 , especially the management areas 20 an axial displacement of the switching shaft 2 can be initiated as a dialing movement.

Overall, the lever device shows 4 as a multifunctional unit, which implements the functions of initiation of the switching movement and the selection movement as well as a vibration damping. With the sheet metal construction of the boom section 7 becomes a low-vibration connection of the vibration damper 6 is ensured at high bending and joint stiffness. This simple construction ensures a stiff boom, which ensures a good functioning of the vibration damper 6 as absorber unit allows.

LIST OF REFERENCE NUMBERS

1

switch dome

2

shift shaft

3

swivel axis

4

lever means

5

interface

6

vibration

7

boom section

8th

shell

9

damper unit

10

switching weight

11a

upper outrigger plate

11b

lower boom plate

12a, b

end

13

screw

14

cup portion

15

Form-fit contour

16

screw

17

bending areas

18

connecting section

19

ball head

20

guide region

21

gap

22

role

23

selector lever

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 102005062170 A1 [0003]
• FR 29078781 [0004]
• DE 60027378 T2 [0005]

Claims (15)

Lever device ( 4 ) for vibration damping of a switching shaft ( 2 ) with a boom section ( 7 ), with an interface ( 5 ) for coupling the lever device ( 4 ) with the switching shaft ( 2 ), the interface ( 5 ) on the boom section ( 7 ) is arranged, and with a vibration damper ( 6 ), wherein the vibration damper ( 6 ) at a free end of the boom section ( 7 ), characterized in that the boom section ( 7 ) the vibration damper ( 6 ) on both sides and / or on two sides. Lever device ( 4 ) according to claim 1, characterized in that the vibration damper ( 6 ) a shift weight ( 10 ) and a damper unit ( 9 ). Lever device according to claim 1 or 2, characterized in that the boom section ( 7 ) is formed as a sheet metal construction. Lever device according to one of the preceding claims, characterized in that the boom section ( 7 ) two cantilever plates ( 11a , b), which between the vibration damper ( 6 ) and the interface ( 5 ) run kinematically parallel and / or independently of each other tensile and / or compressive forces of the vibration damper ( 6 ) to the interface ( 5 ) can transmit. Lever device according to claim 4, characterized in that the cantilever plates ( 11a , b) Bending areas ( 17 ), the torsional rigidity of the boom section ( 7 ) increase. Lever device ( 4 ) according to one of the preceding claims, characterized in that the two cantilever plates ( 11a , b) are detachably connected to each other. Lever device ( 4 ) according to one of the preceding claims, characterized in that the two cantilever plates ( 11a , b) at the interface ( 5 ) and / or on the vibration damper ( 6 ) are connected to each other via a screw connection. Lever device ( 4 ) according to one of the preceding claims, characterized in that in the interface ( 5 ) a positive connection ( 15 ) to the shift shaft ( 2 ) is introduced. Lever device ( 4 ) according to one of the preceding claims, characterized in that at least one of the cantilever ( 11a , b) a forming area ( 14 ) for the areawise spacing of the cantilever ( 11a , b). Lever device ( 4 ) according to one of the preceding claims, characterized in that a gap ( 21 ) between the cantilever plates ( 11a , b) is designed as a selector lever engagement. Lever device ( 4 ) according to one of the preceding claims, characterized in that on the lever device ( 4 ) a connection section ( 18 ) is provided for a cable or for a shift linkage. Lever device according to claim 11, characterized in that the connection section ( 18 ) in one piece with one of the cantilevered sheets ( 11a , b) is formed. Switching dome ( 1 ) with a switching shaft ( 3 ), characterized by a lever device ( 4 ) according to one of the preceding claims, wherein the lever device ( 4 ) rotatably and / or non-displaceable with the switching shaft ( 2 ) connected is. Switching dome ( 1 ) according to claim 13, characterized in that the boom section ( 4 ) projecting radially to the pivot axis ( 3 ) of the switching shaft ( 2 ) is arranged so that the vibration damper ( 6 ) at a switching movement of the switching shaft ( 2 ) in the direction of rotation about the pivot axis ( 3 ) to be led. Switching dome according to claim 13 or 14, characterized by a selector lever ( 23 ), whereby the selector lever ( 23 ) for transmitting the selection movement to the switching shaft ( 2 ) on the boom section ( 7 ) is supported.

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