DE102007020188A1 - Locking device for securing the position of a gearbox - Google Patents

Abstract

Usually, a locking pin is used in the assembly of switching devices or gearboxes for fixing a switching element, which is durchdurch through a through hole of the housing and inserted into a recess of the switching element to lock this form-fitting or to block. After mounting the switching device or the transmission of the locking pin is pulled out and thus released the switching device or the transmission. The invention relates to a locking device for securing the position of a switching element 2, which is arranged in a housing space of a housing for a transmission and / or for a switching device, in particular a Schaltdomgehäuses 1, with a housing fixedly arranged receiving device 3, which comprises a housing passage opening 9, and with a blocking means 5, wherein the blocking means 5 in the housing passage opening 9 of the receiving device 3 between such a locking position and a release position so movably arranged and / or is formed so that in the blocking position the switching member 2 is locked and released in the release position, wherein the receiving device 3 and the blocking means 5 in the release position together form a ventilation device for the housing space.

Description

Field of the invention

The The invention relates to a locking device for securing the position a switching element, which in a housing space of a Housing for a transmission and / or for a switching device, in particular a Schaltdomgehäuses is arranged with a housing fixedly arranged receiving device, which comprises a housing passage opening, and a blocking means, wherein the blocking means in the housing passage opening the receiving device between a blocking position and a release position arranged so movable and / or formed that in the Lock position locked the switching element and released in the release position is.

Background of the invention

such Locking devices are often used to install or Repair the position of a switching element in a switching device or to fix in a transmission, z. B. this for to prepare the installation in a drive train for assembly.

Usually is used to fix the switching element, a locking pin, which through a passage opening of the housing through- and inserted into a recess of the switching member to to positively lock or block this. To the assembly of the switching device or the transmission the locking pin is pulled out and thus the switching device or the gearbox released.

The publication EP 0 940 606 B1 discloses, for example, such a locking device for a transmission, wherein a spring-biased locking pin engages in a recess of a Rastierhülse, which is rotatably mounted on a switching shaft, to block the shift shaft form-fitting manner. For sealing a circumferential groove is formed on the locking pin, in which an O-ring is arranged as a seal, which seals the locking pin against the housing in a fluid-tight manner.

The publication DE 44 411 38 C2 proposes a similar device which comprises a fixing pin which can be pushed against a spring bias from a release position into a blocking position, wherein the fixing pin engages positively in the blocking position in a switching sleeve in a switching shaft and this positively locked. For sealing the fixing pin a sealing device is provided.

Also the publication DE 198 059 24 A1 describes in connection with a transmission, a locking device with a bolt which can be inserted to set a central control shaft in a bore in the central control shaft. Such conventional locking devices are probably the closest prior art.

Furthermore, it is known to provide in transmission housings venting devices, which allow to reduce the pressure generated during operation of the transmission. Such venting devices are for example from the DE 198 33 536 C2 . DE 199 45 897 C2 or also the publication DE 199 48 422 A1 known. The latter document shows a switching device with a housing in which a transmission shaft for transmitting selector and / or switching movements is arranged, and which has a nozzle in which a plug of a transmission ventilation is snapped.

Summary of the invention

Of the Invention is based on the object, a locking device for a switching element of a switching device and / or a transmission to improve.

These Task is solved by a locking device with the Features of claim 1. Preferred or advantageous embodiments The invention will become apparent from the dependent claims, the following description and the accompanying figures.

The Locking device according to the invention is suitable and / or designed to secure the position of a switching element in a housing space of a housing, wherein the Housing for receiving and / or covering a transmission and / or a switching device, and preferably as a switching dome housing is trained. The housing is preferably in the form of a cast iron housing realized.

The Switching element is preferably as a shift rod, shift shaft or shift transmission member trained, and in particular allows a transfer of Switching movements by means of a pivoting about or a shift along its own axis.

The Locking device comprises a receiving device arranged fixed to the housing, which shows a housing through-hole, so that an open passage between the environment and the gear room the transmission housing is formed.

A blocking means is at least partially arranged in the housing passage opening and there between a blocking position and a Release position movably mounted. The arrangement of the blocking means or the receiving device is realized so that in the blocking position, the blocking means in the switching element or in a fixedly connected to the switching element extension preferably positively engages and this locks against particular unintentional switching movements. In the release position, this lock, in particular this form-fitting is canceled, so that the switching element for switching operations in the intended manner is movable.

Form according to the invention the receiving device and the locking means at least in the release position together a venting device for the Gear compartment. The invention thus proposes the function the blocking or locking of the switching element and the vent the housing space in a single device to summarize which thus has a double function. Benefits arise from the reduced number of housing passage openings and by reduced manufacturing costs.

optional it can be provided that the receiving device and the blocking means even in the blocking position form the or a ventilation device, so that regardless of the position of the blocking means a Venting of the gear compartment is realized. alternative is the vent in the locked position also locked.

in principle the receiving device can be fixed to the housing in any manner be arranged, so for example, the receiving device as Part of a particular screw-on housing cover be educated. However, an embodiment is preferred wherein the receiving device as an integral and / or one piece molded part of the housing is formed. Especially the receiving device is realized as a sprue, so that the receiving device together with the housing during the molding process, z. B. is made during a gray cast iron. This embodiment is particularly inexpensive to manufacture.

at In a practical realization, the receiving device is as a outwardly cantilevered neck or pipe section, in particular with cylindrical shape, formed. This realization facilitates the assembly and operation of the locking device.

at An advantageous development of the invention is the blocking means made of an elastic material, in particular plastic. On the one hand, this material choice simplifies an optional, one-piece design Production of the blocking agent, z. B. by injection molding, on the other can with a elastic material the ventilation function the locking device to be implemented more accurately, since sections of the Blocking means defined together with the receiving device Abdichtbereiche can form. The blocking of the switching element, however, can easily done with an elastic material, as long this is sufficiently rigid.

at a preferred embodiment of the invention, the locking means a projecting into the housing at least in the locked position End section on which locking and / or positive engages in a receiving contour of the switching element. The recording contour can, for example, a recess or recess of the switching element, for example, the shift shaft, be. Alternatively, on the switching element an intermediate member, such as. B. a switching or Rastierhülse arranged, in particular fixed against rotation and displacement, in the the end portion engages or cooperates with the end portion. In a simple embodiment, the switching element and / or the intermediate member on a receiving contour, which in the locked position the locking device coaxially and / or in alignment with the housing passage opening is arranged and which in cross section preferably circular is trained.

at a development of the invention is the end portion and / or the receiving contour is designed so that an active actuation of the switching element leads to an unlocking of the blocking means, wherein pushed the locking means from the blocking position to the release position becomes. In this development, he follows the unlocking of the locking device automatically and / or automatically at the first switching of the the switching element actuated gear or the switching device. In a practical realization of the invention, the end portion of the Switching member on a conical shape, which in a hole or the Recording contour in the switching element or in the intermediate member engages, wherein in a twisting or shifting of the Switching member or the intermediate member, the blocking means by the length of the cone in the direction of the release position moved and the switching element is unlocked in this way. at the implementation takes into account that the locking device the switching element only against unintentional and / or slight operations locks, but is released when active.

In a preferred embodiment of the invention, the blocking means is formed as a mushroom-shaped part, in particular plastic injection molded part, wherein a shaft portion engages as a bolt in or through the housing passage opening and a cap portion engages around the receptacle formed as a nozzle. The shaft region thus assumes the function of a locking pin in the Sperrvorrich true, whereas the cap portion is used for positive attachment of the locking means to the receiving device.

to Definition of the position of the release position and / or the blocking position of the locking means, it is preferred that the nozzle be two radially reveals circumferential, outwardly pointing nozzle webs, the with a radially encircling, inwardly pointing support web cooperate in the cap area. The embraced by the jetty Area has an inner diameter which is smaller, than the outer diameter of the nozzle webs, so that the Cap area or the blocking means only against a resistance over the nozzle webs can be pulled. Preferably corresponds to Distance between the nozzle webs, in particular to the housing facing edges of the branch webs, at least the length the cone at the end portion of the locking means, so that the locking means in the blocking position by an overlapping of the holding web over the close-fitting nozzle web is held and at a Unlocking by actuation of the switching element, the blocking means to the length of the cone or the like to the outside is moved, in particular such that the retaining web on the housing-detached connection web comes to the plant.

to Realization of the vent function form blocking means and recording device together a channel system, which a fluid-open connection between the housing space and the Environment provides. Preferably, the channel system is formed by the blocking means has a longitudinal groove in the shaft region and that the nozzle webs and / or the outside of the neck also shows a longitudinal groove or recesses, such that the continuous fluid-open connection is formed.

at a particularly preferred structural implementation of the locking device in the case, this will be on a later intended operation high altitude or highest altitude Arranged area so that through the ventilation device preferably only emit gases, but not resources of the transmission or the switching device emerge.

Brief description of the drawings

Further Features, advantages and effects of the invention will become apparent the following description of a preferred embodiment the invention. Showing:

1 a schematic cross-sectional view of a switching dome with a locking device in the locked position as a first embodiment of the invention;

2 the switching dome in 1 in the same representation, wherein the locking device is in the release position;

3 Detail A in 1 ;

4 Detail B in 2 ;

5 a schematic plan view of the switching dome in the 1 and 2 ;

6 Section C in 5 ;

7 a schematic plan view of the receiving device of the locking device in the 1 and 2 ;

8th a schematic plan view of the plug of the locking device in the 1 and 2 ,

Detailed description the drawings

The 1 shows a schematic cross-sectional view of a Schaltdomgehäuse 1 for a transmission in which a shift shaft 2 slidable in the longitudinal direction and / or is arranged pivotably about its own axis. The shift shaft 2 serves to implement switching movements of the driver in gear changes within the transmission and has this customary shift finger, Rastierhülsen (not shown), etc., which rotatably and / or non-displaceable on the shift shaft 2 are arranged. With its one end, the stem protrudes 2 from the Schaltdomgehäuse 1 out, the other end of the stem 2 runs in the direction of the downstream transmission. The switch housing 1 is made, for example, as gray cast iron. When mounting a switching device which the Schaltdomgehäuse 1 and / or the shift shaft 2 includes, the shift shaft must 2 be temporarily locked at least temporarily to be fixed in the delivery state in a well-defined location. In particular, the switching position during transport and assembly by unintentional operation should not change.

For fixing the stem 2 is on the Schaltdomgehäuse 1 a locking device provided as an embodiment of the invention, which consists of a nozzle designed as a sprue 3 with a passage opening 4 as well as with a stopper 5 made of plastic, which in the passage opening 4 Is arranged slidably in the axial extent is formed.

The stopper 5 has a cap 6 which the neck 3 at least partially coaxial and / or concentrically surrounds, and a shaft 7 acting as a bolt in the through hole 4 runs and in the in 1 illustrated blocking position of the locking device with its end portion 8th in a recess 9 engages, which in one on the shift shaft 2 fixed switching sleeve 10 is introduced. By doing that, the plug 5 , the shaft 7 or the end section 8th in the recess 9 engages, is the shift sleeve 10 and thus the firmly connected switching shaft 2 positively and / or frictionally locked against unintentional switching movements.

The 2 shows the switching dome 1 in 1 in the same representation, the stopper 5 has been transferred from the blocking position to a release position. In the illustrated release position is the end portion 8th of the plug 5 so far from the recess 9 the shift sleeve 10 pulled out that the shift sleeve 10 together with the stem 2 can be twisted or moved unhindered. In the sense of a method considered the Schaltdomgehäuse 1 or the switching device arranged therein supplied and mounted while the nozzle 5 in locked position. After the assembly, the nozzle is 3 transferred from the locked position to the release position and the shift shaft 2 and thus the switching device or the transmission released.

The 3 respectively 4 show the detail A or B from the 1 and 2 , wherein it can be seen that the end portion 8th of the plug 5 is formed cone-shaped, so that during a displacement or rotation of the switching sleeve 10 the stopper 5 automatically or automatically pushed out of the locked position into the release position.

Instead of a cone-shaped design of the end portion 8th can the end section 8th have any contour which leads to an automatic displacement of the plug 5 leads. Alternatively or additionally, a corresponding contour, in particular a ramp, in the edge region of the recess 9 be provided so that the stopper 5 is pushed out in a corresponding manner.

In order to avoid an unwanted transition from the blocking position to the release position during assembly or transport, has the nozzle 3 a radially encircling, first nozzle web 11 on, by a radially inwardly directed, also circumferentially formed retaining web 12 inside the cap 6 is engaged behind against the direction of displacement of locking position in the release position and in this way the plug 5 locked. The jetty 12 can - as shown in the figures - as a free edge portion of the cap 6 be educated.

A second radial circumferential nozzle web 13 is parallel to the first nozzle web 11 arranged and serves as Verlierschutz for the plug 5 , wherein in the release position of the second nozzle web 13 from the jetty 12 is engaged behind.

The distance a of the two nozzle webs 11 and 13 corresponds to the displacement a between the blocking position and the release position of the plug 5 and also the length of the cone in the axial extension, which causes the sliding movement. Of course, as an alternative to an automatic or automatic displacement of the plug 5 this can also be changed manually in the situation.

The 5 shows a plan view of the Schaltdomgehäuse 1 frontal on the neck 3 in a schematic representation. The 6 shows the detail C in the 5 where the stopper 5 can be seen in a sectional view. The stopper 5 points in the area of the shaft 7 a longitudinal groove 14 on, leaving the shaft 7 together with the inner surface of the nozzle 3 forms a vent channel, which connects the housing interior with the environment. So there is no stagnation under the cap 6 comes, have the nozzle webs 11 and 13 each have a passage area, which consists of recesses 15 in the nozzle webs 11 respectively. 13 is formed, so that by the longitudinal groove 14 formed venting channel over the interior of the cap 6 and then over the recesses 15 continues into the environment. Thus, over the recess 15 of the second nozzle web 11 in the release position the housing space of the switching dome 1 vented. In the blocking position, the venting takes place via both recesses 15 the first and the second nozzle web 11 respectively. 13 , If no venting in the locked position, so can on the recess 15 of the first branch bridge 11 be waived.

The 7 and 8th show the neck 3 or the stopper 5 , in each case in a schematic plan view to illustrate the position and formation of the venting channels. As is clear from the 6 results are the recesses 15 as interruptions of the nozzle webs 11 respectively. 13 trained and lying in line with each other. The distance a determines the maximum travel of the plug 5 from one through the spigot 11 formed first stop and one through the nozzle web 13 formed second stop. In the 6 are the outer diameter of the nozzle webs 11 and 13 chosen the same, in modified embodiments, the outer diameter of the second nozzle web 13 be chosen larger to ensure a loss of protection.

In the 7 is strongly schematized the longitudinal groove 14 shown along the shaft 7 runs and goes up under the cap 6 extends. The length a of the cone-shaped end region 8th corresponds to the distance a between the first and the second stop. In alternative embodiments, a third stud land (not shown) may be interposed between the first and second stud lands 11 and 13 be arranged. This third nozzle web is arranged and / or formed, a re-locking the shift shaft 2 to prevent, by the stopper 5 is positively locked by the third nozzle web.

Overall, therefore, a combined barrier-venting in the form of the neck 3 in connection with the stopper 5 proposed, which on the one hand a fixation of the switching shaft 2 for assembly purposes and on the other a ventilation of the housing space allowed to reduce pressure differences inside against the environment. The nozzle is preferred 3 at a highest point or position of the Schaltdomgehäuses in the later installation position 1 arranged to prevent leaks.

1

gearshift tower

2

shift shaft

3

Support

4

Through opening

5

Plug

6

cap

7

shaft

8th

end, cone

9

recess

10

switching sleeve

11

internal Stutz Steg

12

holding web

13

outer Stutz Steg

14

longitudinal groove

15

recesses

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• EP 0940606 B1 [0004]
• - DE 4441138 C2 [0005]
• - DE 19805924 A1 [0006]
• - DE 19833536 C2 [0007]
• - DE 19945897 C [0007]
• - DE 19948422 A1 [0007]

Claims (10)

Locking device for securing the position of a switching element ( 2 ), which in a housing space of a housing for a transmission and / or for a switching device, in particular a Schaltdomgehäuses ( 1 ) is arranged with a housing fixedly arranged receiving device ( 3 ), which has a housing passage opening ( 9 ) and with a blocking means ( 5 ), the blocking agent ( 5 ) in the housing passage opening ( 9 ) of the recording device ( 3 ) is arranged so movable between a blocking position and a release position and / or is formed such that in the blocking position, the switching element ( 2 ) is locked and released in the release position, characterized in that the receiving device ( 3 ) and the blocking agent ( 5 ) in the release position together form a ventilation device for the housing space. Locking device according to claim 1, characterized in that the receiving device ( 3 ) as an integral and / or integrally formed part of the transmission housing ( 1 ) is trained. Locking device according to claim 1 or 2, characterized in that the receiving device as an outwardly cantilever neck ( 3 ) is trained. Locking device according to one of the preceding claims, characterized in that the blocking means ( 5 ) is formed of an elastic material. Locking device according to one of the preceding claims, characterized in that the blocking means ( 5 ) an end portion projecting into the housing ( 8th ), which in the blocking position blocking in a receiving contour ( 10 ) of the switching element ( 2 ) intervenes. Locking device according to one of the preceding claims, characterized in that the end section ( 8th ) and / or the receiving contour ( 10 ) is formed, during a displacement and / or pivoting of the switching element ( 2 ) the blocking agent ( 5 ) from the locked position to the release position. Locking device according to one of the preceding claims, characterized in that the blocking means ( 5 ) is mushroom-shaped, wherein a shaft region ( 7 ) in or through the housing passage opening ( 9 ) and a cap area ( 6 ) as a nozzle ( 3 ) formed receiving device surrounds. Locking device according to claim 7, characterized in that the neck ( 3 ) two radially encircling, outwardly pointing nozzle webs ( 11 . 13 ), which with a radially encircling, inwardly pointing retaining web ( 12 ) in the cap area ( 6 ) in the blocking position or in the release position of the blocking means ( 5 ) interact. Locking device according to one of the preceding claims, characterized in that the blocking means ( 5 ) and the receiving device ( 3 ) together form a channel system which provides a fluid open connection between the gear compartment and the environment. Locking device according to claim 9, characterized in that the shaft region ( 7 ) and the neck ( 3 ) to form the channel system in each case a groove ( 14 ) and / or a recess ( 15 ) exhibit.