DE102004053894A1 - Gear box element has rail part and fork part connected to each other with limited mobility so that vibrations of rail part are not transferred to fork part - Google Patents

Abstract

The gear box element (1) contains rail part (2) and fork part (3) connected with each other. Rail part moves gear box element in partial longitudinal direction (7) with switch movements for production of gear shift and fork part with fork legs (24,26) transfer switch action to torque transferring element. Rail part and fork part are connected to each other with limited mobility relative to each other.

Description

The The invention relates to a transmission shifting element which has at least one Rail part and includes a fork part, which are interconnected are, wherein installed in a transmission state of the transmission switching element the rail part, the gear shift element in the rail part longitudinal direction leads movable and with switching forces is applied to generate switching movements and wherein the Fork with two fork legs the switching movements on torque transmitting Elements of the transmission transmits.

One Such transmission shift element is, for example, as a shift fork for a manual transmission (manual transmission) or a dual-clutch transmission one Motor vehicle known.

at a transmission shift element known from practice is the rail part cohesively with the fork part connected, preferably welded. The rail part has one elongated basic shape with two free ends and serves to guide the Gear shift element within a transmission. Along one provided in the transmission guide device the transmission shift element is displaced back and forth. To the connection with the fork part, the rail part has a connection area on. The fork part is substantially U-shaped and has two fork legs, the above a back part one piece connected to each other. The back part forms upper side a flat surface area, here a connection area as a counterpart to the connection area of Rail part forms.

Out In practice, it is alternatively known, a transmission shift element as one piece Casting, in particular precision casting, manufacture.

In a state built into a transmission is the transmission shifting element in rail part longitudinal direction movably guided. Transfer the fork legs the switching movements according to the displacement of the rail part on torque transmitting Elements of the transmission.

When Main disadvantage of this known from practice prior art with a gear shift element of the type specified above is to be considered, that inaccuracies and tolerances between the fork part and one with the fork part in a gear engaged sliding sleeve consist of the Rail part and other fasteners as vibrations up to the gear lever operated by a driver of a motor vehicle procreate. These vibrations are disturbing when switching the gearbox, so that one Driver of the motor vehicle transmitted an uncomfortable shift feel becomes.

Of the Invention is therefore the object of a transmission shift element of the type mentioned initially go to improve that for a Driver of the vehicle a softer, smoother shifting without vibration of the gearshift lever results.

According to the invention Task solved by that this Rail part and the fork part with limited mobility relative connected to each other.

With the invention is advantageously achieved that inaccuracies and tolerances, between the fork part and one with the fork part in a transmission engaged sliding sleeve and lead to vibration, itself not over the rail part and other fasteners to the of Propelling gearshift lever operated by a driver of a motor vehicle can, because the inaccuracies and tolerances in the moving connection be taken up and balanced by rail part and fork part. As a result, a softer start at the beginning of the switching movement and a smoother shifting and a comfortable vibration of the gearshift lever reached. For the desired balance enough a small relative movement between the rail part and the fork part, so the necessary accuracy the switching movements unimpaired preserved.

To the one can the fork part relative to the rail part parallel to the longitudinal direction be movable of the rail part. This is advantageously provided that the longitudinal displacement of rail part and fork part to each other relatively small is. For example, a displacement path can be between 0.5 and 1 mm, preferably between about 0.7 to 0.8 mm, to achieve the desired Effect completely be enough.

On the other hand, as an alternative or in addition, the fork part can be so limited in rotation relative to the rail part that free ends of the fork legs of the fork part are movable in opposite directions in a direction approximately parallel to the longitudinal direction of the rail part. Conveniently, it is also provided that the relative rotatability of rail part and fork part to each other is also limited to relatively small values. The rotatability can advantageously be limited in the sense of the invention such that at the free end of the two fork legs of the fork part a movement of about 1 to 2 mm results in a direction approximately parallel to the rail part direction. Of course, the path of movement of the free ends of the fork legs is on a circular path; However, since the movement path is dimensioned so small relative to the orbit radius, results in an approximately linear path of movement of the free ends of the fork legs.

Around an easily produced and at the same time reliable connection of the fork part To achieve with the rail part, it is advantageously provided that the fork part a laterally open, seen in cross-section U-shaped pocket with a base bar and two U-legs, in which a tab of the rail part engages, wherein the tab in the longitudinal direction the rail part limited slidably and / or in the direction of rotation limited rotatably stored in the bag. The flap forms forms a connecting portion of the rail part and the pocket a connection region of the fork part. Both connection areas are preferably adapted to one another with their design, that flap in the mounted state with slight play in the rail part longitudinal direction and / or taken in the twisting direction in the bag.

Prefers This is further provided that the fork part a hole in its U-legs, that the rail part in his Lasche has a corresponding bore and that the connecting element through the holes, the hole in the tab to the connecting element is a play of movement and is a slot or a round hole.

to Connection of the rail part with the fork part is also expediently provided that this Connecting element has a bolt shape and frictionally, preferably under a press fit, is received in the bore of the fork part.

The as a press stud executed Connecting element is useful at least a front side, preferably at both ends, chamfered.

at the assembly of the transmission switching element is appropriate the Connecting element by the mutually aligned aligned Drill holes to the foot pressed the hole in the fork part. The pressed-in connection element then sits tight in the hole in the fork part. The hole in the Tab of the rail part, through which the connecting element also runs, has a slight excess to that necessary Movement play available In addition, and may also be designed as a slot, e.g. with a movement game from about 0.5 to 1 mm in the longitudinal direction of the rail part.

Around in the relative mobility of the fork part in the longitudinal direction of the rail part to achieve that in the unloaded state of the Fork part of this one defined position relative to the rail part occupies, is advantageously provided that between the rail part and the fork part at least one force storage element, preferably a spring is arranged in the unloaded state of the fork part this relative in a defined displacement and / or twisting position positioned to the rail part. The energy storage element may be preferred be designed as a spring, for example in the manner of a spring plug, which is a relatively small preload force, for example of about 50N. The energy storage element consists for example from a steel wire of about 1 mm in diameter. Through the energy storage element becomes advantageous at least with regard to the longitudinal displaceability of the rail part and fork part relative to each other a defined position in the unloaded state causes. Alternatively or in addition it is also possible to provide a restoring spring which acts in the direction of rotation, to a defined position of the fork legs in the unloaded state set, for example, a middle position between the twist end positions.

to Captive placement of the energy storage element is preferred the rail part at least one depression on its tab, in which the power storage element is added, the built-in Condition biased against the connecting element. Of course, in the tab also several, preferably two wells and accordingly two holes may be arranged in the longitudinal direction of the rail part spaced apart from each other. In such an embodiment can the fork part in different positions with the rail part get connected.

at the assembly of the transmission switching element with energy storage element will be first serving as a force storage element spring in the associated recess inserted in the tab of the rail part. Subsequently, will the rail part with its tab pushed sideways into the pocket of the fork part Finally, the connecting element is pressed.

There the connecting element at least on one of its end faces, preferably is chamfered on its leading side, is advantageously achieved that the connecting element deflects a spring leg coming into contact with this and so pretentious. Another advantage of the touched face of the Connecting element is the fact that during assembly the bore centerline the tab hole is not necessarily exactly congruent to the center line the U-leg holes must be because the connecting element by means of the attached end face as well Centering acts.

The Fork part engages with the free ends of his fork legs in the associated shift sleeve of the transmission, wherein the shift sleeve usually a steel part is. To achieve a favorable sliding pair is therefore appropriately provided, that this Fork part a brass casting or an aluminum die casting is. Alternatively, the fork part can also be a brass coated Be steel part. Instead of the brass coating can also be provided a plastic coating be.

The Rail part is expediently a steel part, preferably a steel sheet fine cutting part. There is another one Advantage of the transmission shift element according to the invention in that this one relatively large Freedom in material selection on the one hand for the rail part and on the other hand for the fork part admits, because the two parts are not bonded together, e.g. welded, be have to and are not integral with each other.

One embodiment The invention will be explained below with reference to the drawing. The figures show the drawing:

1 an overall perspective view of a transmission switching element with a rail part and a fork part,

2 the gear shift element off 1 in an enlarged partial perspective view, partly in a broken view, and

3 a tab of the rail part with associated power storage element as a detail in a plan view.

In the respective figures are the same parts each with the same Provided with reference numerals, so that these usually only be described once.

1 shows a gear shift element 1 , which is designed as a shift fork. The gear shift element 1 can be used for example in a dual-clutch transmission or direct shift transmission of a motor vehicle. The gear shift element 1 has a rail part 2 and a fork part 3 on.

The rail part 2 has an elongated basic shape with two free ends 4 and 6 and serves to guide the gear shift element 1 within the other transmission, not shown. Along a guidance device provided in the transmission is the transmission shifting element 1 in its longitudinal direction according to the double arrow 7 movable back and forth. According to the shift by the fork part 3 switched torque transmitting parts of the transmission. Approximately in a middle region of the rail part 2 is a position detection element 8th for a position detection of the gear shift element 1 arranged.

The gear shift element 1 are bearing elements 9 , For example, ball bearings, associated with the transmission shift element 1 in a state installed in a transmission in the rail part longitudinal direction 7 to lead. In the illustrated embodiment, one of the bearing elements 9 directly to the free end 4 assigned while the other bearing element 9 longitudinal 7 seen something to the free end 6 is spaced.

The rail part 2 points approximately near the free end 4 a tab 11 on. The tab 11 is in the preferred embodiment in a plane integral with the rail part 2 manufactured and has a flat configuration, so that a rail part connecting portion is formed.

In the flap 11 is on one to the free end 4 pointing end area 12 a depression 13 arranged ( 2 ). The depression 13 is in the illustrated example across the entire width of the tab 11 placed in this and up and to a front page 14 the tab 11 open.

In the area of the depression 13 is one through the tab 11 through hole 16 ( 3 ) introduced in the longitudinal direction 7 Seen preferably a slight oversize, suitably from about 0.5 to 1 mm, has, that is designed as a slot.

In the depression 13 is a force storage element 17 arranged. The energy storage element 17 is designed as a spring, approximately in the manner of a spring connector. The energy storage element 17 has a substantially rectilinear plant leg 18 and one of this substantially inverted S-shaped bent power leg 19 on. With its rectilinear investment thigh 18 lies the force storage element 17 on a transverse edge 21 the depression 13 at. In the illustrated embodiment, the plant leg is located 18 at the free end 4 nearest transverse edge 21 at.

The S-shaped power leg 19 is designed such that a head part 22 with his relative to the plant thigh 18 concave curvature to the plant leg 18 points, with a foot part 23 with his relative to the plant thigh 18 convex curvature of the plant thigh 18 points away.

The energy storage element 17 is preferably made of a suitable spring steel wire with a Diameter dl made of about 1 mm. From a free end of the plant leg 18 up to a zenith of the head-side bend has the force storage element 17 here an axial length 1 of about 19 mm. The curvature of the head-side bend here has an outer diameter D of about 9 mm ( 3 ).

The fork part 3 is essentially U-shaped and has two fork legs 24 and 26 that have a back part 27 are integrally connected to each other. The back part 27 is a headboard 28 assigned. The fork part 3 is with his fork legs 24 and 26 , his back 27 and the associated header 28 manufactured in one piece, eg as a brass casting.

The headboard 28 of the fork part 3 has a laterally open, seen in cross-section U-shaped pocket 29 with a base bar 31 and two U-thighs 32 and 33 on. The U-shaped bag 29 forms a fork joint area.

In the U-thighs 32 and 33 is a hole 34 brought in. The part of the hole 34 in the U-thigh 32 , which with its outside at the same time a surface 37 of the headboard 28 is continuous through the U-leg 32 brought in. The part of the hole 34 in the U-leg 32 opposite U-legs 33 is closed on the foot side in the illustrated embodiment, but can also be continuous in the U-leg 33 be introduced. The part of the hole 34 in the U-thigh 33 is not recognizable in the selected representations.

For connecting the rail part 2 with the separate fork part 3 will be the tab 11 of the rail part 2 with preloaded energy storage element 17 sideways into the bag 29 of the fork part 3 inserted. The rail part 2 gets so far in the bag 29 of the fork part 3 inserted until a center line of the bore or the slot 16 essentially congruent with the centerline of the bore 34 is.

As the energy storage element 17 in the depression 13 is inserted before the lateral insertion, is the force storage element 17 secured in the assembled state unverlier bar. To illustrate the position of the energy storage element 17 is in 2 a part of the U-thigh 32 of the fork part 3 broken away, so that here the force storage element 17 is visible. In reality, the energy storage element is located 17 but included in the bag 29 of the fork part 3 and is then no longer visible ( 1 ).

For the final connection of the fork part 3 with the rail part 2 becomes the last a bolt-shaped connecting element 38 through the holes 34 and 16 pressed.

The connecting element 38 here has a diameter d of about 6 mm and is at least on one of its two end faces 39 , preferably at both ends 39 , chilled. The connecting element 38 is preferably designed as a press pin, which in the pressing through the holes 34 . 16 with the energy storage element 17 , in particular with its convex foot part 23 , comes into contact and this sideways, preferably in the direction of the plant leg 18 , deflects and so pretends. The preload force F ( 3 ) is preferably relatively small and has, for example, an amount of about 50 N.

After pressing in the connecting element 38 through the respective holes 34 . 16 , the connecting element sits 38 tight in the fork part 3 stuck while the rail part 2 relative to the connecting element 38 and to the fork part 3 limited mobility remains. With his free end 41 closes the connecting element 38 essentially flush with the surface 37 of the headboard 28 or the U-leg 32 from.

Due to the inventive design of the transmission switching element 1 with its separately interconnected rail part 2 and fork part 3 becomes an improved transmission shift element 1 provided, its rail part 2 and fork part 3 are associated with each other under limited mobility relative to each other.

The limited mobility relative to one another in this case preferably in two coordinates, namely on the one hand parallel to the longitudinal direction 7 of the rail part 2 and on the other in one direction of rotation (double arrow 42 ) with respect to a central axis X of the connecting element 38 ,

With regard to the longitudinal movement 7 of the rail part 2 is by means of the energy storage element 17 in the unloaded state a defined basic position achievable, since in the installed state or in the assembled state of the rail part 2 with the fork part 3 the energy storage element 17 has the bias F. The relative longitudinal displacement (arrow 36 in 3 ) of rail part 2 and fork part 3 to each other is relatively small and is for example in a range between 0.5 and 1 mm, preferably in a range between about 0.7 to 0.8 mm.

The twistability of rail part 2 and fork part 3 relative to each other is also limited to relatively small values. The rotatability may be limited so that at a free end of the fork legs 24 and 26 of the fork part 3 a move from about 1 to 2 mm in an approximately parallel to the rail part 2 extending direction results.

The twistability is in 1 exaggerated. In practice, the fork legs can be twisted 24 and 26 in the direction of the double arrows 42 turn counterclockwise up to about 1 mm in each case in opposite directions, the axis of rotation passing through the center axis of the connecting element 38 is formed. This results in the movement path of the fork legs 24 . 26 from about 1 to 2 mm approximately parallel to the rail part 2 , The path of movement of the free ends of the fork legs 24 . 26 of course lies on a circular path. However, since the path of movement is so small, it is possible for a nearly linear path of movement in the approximately parallel to the rail part 2 extending direction are assumed.

The tab 11 of the rail part 2 is designed so that when in the bag 29 of the fork part 3 is included, a defined limited freedom of movement in the direction of rotation (double arrows 42 ), based on the central axis of the connecting element 38 , having.

In the embodiment shown in the drawings, the force storage element acts 17 advantageous in the direction of longitudinal displacement 7 from fork part 3 to the rail part 2 up to today. The torsional mobility is here of the force storage element 17 unaffected. Alternatively or additionally, a return spring acting in the direction of rotation may be provided in order to set a defined position, for example a middle position of the fork legs 24 and 26 between their twist final positions.

The free ends of the fork legs 24 and 26 of the fork part 3 engage within a transmission in a shift sleeve. The shift sleeve is usually a steel part. To achieve a favorable sliding pair is preferably the fork part 3 a cast brass part or an aluminum die cast part or a cast steel part coated with brass or plastic. The rail part is again preferably a steel part.

This leaves the transmission shift element according to the invention 1 a relatively large freedom in material selection on the one hand for the rail part 2 and on the other hand for the fork part 3 too, because the two separate parts 2 and 3 do not have to be welded together and are not integral with each other.

1

Gear selector member

2

rail part

3

fork part

4

free The End

5

6

free The End

7

Longitudinal direction v. 2

8th

position detection

element

9

bearing elements

10

11

flap

12

End area v. 2

13

deepening

14

Front side v. 11

15

16

Bore in 11

17

Power storage element

18

contact leg

19

power leg

20

21

transverse edge

22

Headboard v. 19

23

Foot part v. 19

24

fork legs

25

26

fork legs

27

back

28

Headboard v. 3

29

bag

30

31

base web

32

U-leg

33

U-leg

34

Bore in 32

35

36

arrow

37

Surface of 28 respectively.

32

38

connecting element

39

End faces v. 38

40

41

free end v. 38

42

pan direction

Claims (11)

Gear shift element, the at least one rail part ( 2 ) and a fork part ( 3 ), which are connected to each other, wherein in the gear installed state of the transmission switching element ( 1 ) the rail part ( 2 ) the gear shift element ( 1 ) in the rail longitudinal direction ( 7 ) is movable and is subjected to switching forces for generating switching movements and wherein the fork part ( 3 ) with two fork legs ( 24 . 26 ) transmits the switching movements to torque transmitting elements of the transmission, characterized in that the rail part ( 2 ) and the fork part ( 3 ) are connected together under limited mobility relative to each other. Gear shift element according to claim 1, characterized in that the fork part ( 3 ) relative to the rail part ( 2 ) parallel to the longitudinal direction ( 7 ) of the rail part ( 2 ) is displaceable. Gear shift element according to one of the preceding claims, characterized in that the fork part ( 3 ) relative to the rail part ( 2 ) is limited so rotatable that free ends of the fork legs ( 24 . 26 ) of the fork part ( 3 ) in one direction ( 42 ) in et wa parallel to the longitudinal direction ( 7 ) of the rail part ( 2 ) are movable in opposite directions. Gear shift element according to one of the preceding claims, characterized in that the fork part ( 3 ) a laterally open, seen in cross-section U-shaped pocket ( 29 ) with a base bar ( 31 ) and two U-legs ( 32 . 33 ) into which a tab ( 11 ) of the rail part ( 2 ) engages, wherein the tab ( 11 ) in the longitudinal direction of the rail part ( 2 ) limited displaceable and / or in the direction of rotation ( 42 ) limited twistable in the bag ( 29 ) is stored. Gear shift element according to claim 4, characterized in that the fork part ( 3 ) a hole ( 34 ) in its U-thighs ( 31 ), that the rail part ( 2 ) in its flap ( 11 ) a corresponding hole ( 16 ) and that a connecting element ( 38 ) through the holes ( 34 and 16 ), wherein the bore ( 16 ) in the tab ( 11 ) to the connecting element ( 38 ) has a movement play and is a slot or a round hole. Gear shift element according to claim 5, characterized in that the connecting element ( 38 ) Has a bolt shape and frictionally, preferably under a press fit, in the bore ( 34 ) of the fork part ( 3 ) is recorded. Gear shift element according to claim 6, characterized in that the connecting element ( 38 ) on at least one end face ( 39 ) is chamfered. Gear shift element according to one of the preceding claims, characterized in that between the rail part ( 2 ) and the fork part ( 3 ) at least one force storage element ( 17 ), preferably a spring, is arranged, which in the unloaded state of the fork part ( 3 ) this in a defined displacement and / or rotational position relative to the rail part ( 2 ). Gear shift element according to claim 8, characterized in that the rail part ( 2 ) on its tab ( 11 ) at least one depression ( 13 ), in which the force storage element ( 17 ), which in the installed state under bias on the connecting element ( 38 ) is present. Gear shift element according to one of the preceding claims, characterized in that the fork part ( 3 ) is a brass casting or a Aluminiumdruckgußteil or coated with brass or plastic steel part. Gear shift element according to one of the preceding claims, characterized in that the rail part ( 2 ) is a steel part, preferably a steel sheet fine cutting part, is.