AT519460A4 - Switching device for a transmission, as well as a switching plate for the switching device and a method for producing the switching device - Google Patents

Abstract

The invention relates to a switching device (1) for a transmission, the switching device (1) comprising: - a guide element (2), which serves for the slidable receiving the switching device (1) in the transmission, and - a switching element (3), which for shifting a switching sleeve is used, wherein the switching element (3) comprises two legs (4) which are arranged U-shaped to each other, wherein it is provided that the sliding sleeve between the two legs (4) of the switching element (3) fits, said two Leg (4) of the switching element (3) are coupled to the base (7) with the guide element (2) and wherein at the free-projecting ends (8) of the two legs (4) in each case a switching plate (13) is arranged. The switching plates (13) have a milling projection (24), wherein at least on one of the switching plates (13) of the milling projection (24) is machined.

Description

The invention relates to a switching plate for a switching device of a transmission, as well as the switching device and a method for producing the switching device.

From EP1711728B1 a shift fork for a variable speed transmission with a fork-shaped base body is known, wherein the base body is designed as a one-piece executed, produced from a chipless forming process sheet metal part. The main body has a switching jaw for engagement in a sliding sleeve. The base body is at least in areas where it surrounds the sliding sleeve, designed as an open towards the switching mouth, U-shaped profile body, which consists of two substantially parallel legs, which are connected to the side facing away from the shift mouth side and thereby form guide grooves , In the areas of the guide grooves in which engages the driving element of the sliding sleeve, the U-shaped profile body is provided with a sliding coating.

The shift fork known from EP1711728B1 has the disadvantage that it has only limited dimensional accuracy.

The object of the present invention was to overcome the disadvantages of the prior art and to provide a switching device, as well as a method for producing the switching device, which has an increased dimensional accuracy.

This object is achieved by an apparatus and a method according to the claims.

According to the invention a switching plate for a switching device of a transmission is provided. The switching plate comprises a U-shaped base body, which has a base and on an inner side of the base then a first leg and a second leg, wherein on the first leg, a first sliding surface is formed and on the second leg, a second sliding surface is formed, wherein the both sliding surfaces are trimmed to each other. On the inside of the base a Fräsvorsprung is formed.

An advantage of the inventive design of the switching plate is that it can be edited after installation in a shift fork to an intended final dimension and thereby the dimensional accuracy of the finished shift fork can be improved.

Furthermore, it can be provided that the milling projection is designed in the form of a cylinder which rises from the inside of the base and which is spaced apart from the two sliding surfaces. The cylinder can have any conceivable basic shape, such as a polygon or another shape. In particular, it can be provided that the cylinder has an elongated shape with rounded portions.

Furthermore, it can be provided that a fastening pin is arranged on the outside of the base, by means of which the base body can be fixed in the switching device. The advantage here is that by means of the fixing pin a durable connection between the switching plate and the switching device can be made.

In addition, it can be provided that an inlet curvature is formed on the sliding surfaces. The advantage here is that the guiding behavior of the switching plate can be improved by the inlet curvature. In particular, it can be avoided by the inlet curvature that occur at a slight tilting of the switching plate local overloads.

Furthermore, a switching device for a transmission is provided. The switching device comprises: a guide element, which serves for displaceable reception of the switching device in the transmission, and a switching element, which serves to displace a sliding sleeve, wherein the switching element comprises two legs, which are arranged in a U-shaped manner, wherein it is provided that the shift sleeve between the two legs of the switching element takes place, wherein the two legs of the switching element are coupled to the base of the guide element and wherein at the free-projecting ends of the two legs each have a switching plate is arranged.

The switching plates are formed as described above and is machined on at least one of the switching plates of the milling projection.

An advantage of the switching device according to the invention is that the Schaltpatten have a high position accuracy. As a result, they are ideally positioned for receiving and moving the shift sleeve, to enable precise shifting and to minimize the wear on the shift plates.

It is also advantageous an expression, according to which it can be provided that on the leg of the switching element, a passage is formed, in which the Schaltpatte is added. The advantage here is that protected by the switching tab in the switching element can be added. As a result, the switching plate can be supported by the switching element and the forces acting on the switching plate forces can be minimized.

Furthermore, it may be expedient if a receiving hole is arranged in the leg of the switching element, in particular in a tab of the passage, in which the fixing pin of the switching plate is added. The advantage here is that the switching plate can be secured by means of the fastening pin in the switching element. As a result, a good captive of the Schaltpatte can be realized.

In addition, it can be provided that the fixing pin of the switching plate is secured to the back of the leg of the switching element. The advantage here is that such a back-securing the Schaltpatte can be easily made. In addition, such a back-securing the Schaltpatte have a high strength.

Furthermore, it can be provided that the fastening pin of the switching plate is secured to the back of the leg of the switching element characterized in that a protruding part of the fastening pin is plastically transformed into a mushroom head. The advantage here is that such a mushroom head can be easily manufactured and has a high strength. The mushroom head can be produced, for example, in that the fastening pin is partially melted and plastically deformed. This can be achieved for example by an ultrasonic welding process. Alternatively, it is also conceivable that the fixing pin is partially melted by other heat input.

According to the invention, a method for producing a switching device according to one of the above forms is provided. The method comprises the following method steps: providing the switching element; - Providing the switching plate; - Attaching the switching plate on the switching element; - Machining the Fräsvorsprunges on the Schaltpatte.

An advantage of the method according to the invention is that the switching device produced by the method can have a high accuracy.

According to a particular embodiment, it is possible that the switching element is punched out of a flat sheet metal part, wherein in a punching and bending process, an adjustment on the legs of the switching element is produced and in a subsequent bending process, the legs of the switching element are brought into their final form. The advantage here is that the switching element can be produced in the simplest possible manufacturing steps and thereby can have a high accuracy.

In particular, it may be advantageous if, for providing the switching element, this is welded to a guide element, wherein the guide element has an elongated extension with two longitudinal ends, wherein in particular a laser welding process is performed. The advantage here is that such a welded joint can have a high strength and beyond that is easy to manufacture.

Furthermore, it can be provided that during welding of the switching element with the guide element, the guide element is held at the two longitudinal ends and that the switching element is held on arranged in the base Positionierausnehmungen. The advantage here is that the position of the switching element is positioned relative to the position of the guide portions of the guide element exactly. Under hold is understood, for example, a clamping in a clamping device or a gripping means of a positioning device.

In addition, it can be provided that the switching plate is thereby secured to the switching element, that the fixing pin of the switching plate is inserted from a leg inner side into the receiving hole in the leg of the switching element and on a Schenkelaußenseite by a thermal process, in particular by an ultrasonic welding process, plastic to a mushroom head is deformed. The advantage here is that the Schaltpatte can be easily and durable attached to the switching element by this measure.

Also advantageous is an expression according to which it can be provided that the guide element is held at the two longitudinal ends during the mechanical processing of the milling projection on the switching plate. The advantage here is that the processing of Schaltpatten takes place in exact position relative to the guide portions of the guide element.

According to a development, it is possible that the milling projection is machined by means of a side milling cutter. The advantage here is that the milling projection can be processed very well by means of a side milling cutter.

Furthermore, it may be expedient if, after the mechanical machining of the milling projection on the switching plates, plain bearing barrels are arranged at the two longitudinal ends of the guide element. The advantage here is that at the end of the manufacturing process, the guide elements can be attached to the previously used for positioning areas of the guide element. Thus, in the final state, the guide surfaces of the switching plates may have a precise relative position with respect to the sliding surfaces of the plain bearing barrels.

The switching plates may be formed of a plastic material. It is preferably provided that a thermoplastic material is used.

In particular, it can be provided that the switching plates are formed from a glass fiber reinforced polyphthalamide. The glass fiber content may preferably be between 30% by volume and 60% by volume.

Furthermore, it can be provided that the switching plates are produced in one piece in an injection molding process.

An adjustment can be made by punching and bending a tab on a flat sheet metal workpiece by means of a stamping and bending tool.

For a better understanding of the invention, this will be explained in more detail with reference to the following figures.

In each case, in a highly simplified, schematic representation:

Fig. 1 is a perspective view of a switching device in the assembled state;

Fig. 2 is a perspective view of a switching plate;

Fig. 3 is a perspective view of the switching device with onsansicht illustrated in exploded Schaltpatte;

Fig. 4 is a perspective view of the switching device with inserted Schaltpatten, but without guide elements.

By way of introduction, it should be noted that in the differently described embodiments, the same parts are provided with the same reference numerals or the same component names, wherein the disclosures contained in the entire description can be mutatis mutandis to the same parts with the same reference numerals or component names. Also, the location information chosen in the description, such as top, bottom, side, etc. related to the immediately described and illustrated figure and these position information in a change in position mutatis mutandis to transfer to the new location.

In Fig. 1, a first embodiment of a switching device 1 for a manual transmission, not shown, of a motor vehicle is shown in a perspective view.

The switching device 1 comprises a guide element 2 slidably received in the gear housing (not shown).

The guide element 2 is coupled to a switching element 3, which serves to move a shift sleeve. The shift sleeve can be designed in various ways and is also not shown. The switching element 3 can also be referred to as a shift fork.

As can be seen from Fig. 1, it can be provided that the switching element 3 comprises two legs 4, which are arranged in a U-shape to each other and between which two legs 4 in the assembled state of the transmission, the shift sleeve is added. The two legs 4 and the free space between the two legs 4 can also be referred to as a switching jaw.

In a first embodiment, as shown in Fig. 1, be provided that the two legs 4 of the switching element 3 are integrally formed from a sheet metal part.

The two legs 4 have a leg inner side 5 and a leg outer side 6. The leg inner sides 5 of the two legs 4 face each other.

In further embodiments, it can also be provided that the two legs 4 are formed as separate components. These independent components can each be welded to the guide element 2.

In particular, it can be provided that the two legs 4 have a base 7 on which they are coupled to the guide element 2. When using legs 4, which are formed as separate components, each of the two individual legs 4 may be coupled to the base 7 with the guide element 2. When using an integrally formed switching element 3, the two legs 4 may be coupled to the common base 7 with the guide element 2.

Furthermore, it can be provided that the switching element 3, in particular the legs 4, are not coupled directly to the guide element 2, but that further components are interposed. In particular, it can also be provided that struts or support elements are formed, by means of which the switching element 3 is stiffened relative to the guide element 2.

The switching element 3 can be coupled to the guide element 2 by a welded connection, in particular a laser welding connection.

The legs 4 have in addition to the base 7 and a free-projecting end 8, through which the U-shape of the switching element 3 is realized.

As can further be seen from FIG. 1, it can be provided that the guide element 2 has an elongated extent and that at least one first bearing element 9 is arranged on the guide element 2, by means of which the guide element 2 is slidably received in the manual transmission of the motor vehicle.

In addition, it can be provided that one of the first bearing elements 9 is arranged in each case at one longitudinal end 10 of the guide element 2. The first bearing element 9 may in this case be in the form of a plain bearing barrel 11.

Alternatively to the use of a plain bearing barrel 11 as a first bearing element 9 on the guide element 2, it is also conceivable that the guide element 2 has a different shape. Such a different shape is shown for example in AT 508 130 B1.

As further seen in FIG. 1, provision can be made for a second bearing element 12 to be arranged on the cantilevered end 8 of the leg 4, which serves to guide the sliding sleeve.

The second bearing element 12 may be realized in the form of a U-shaped switching plate 13, which is arranged on the free-standing end 8 of the legs 4. The U-shaped Schaltpatte 13 may have a receiving space 14 in which a protruding bead of the shift sleeve is guided.

FIG. 2 shows a schematic illustration of the switching plate 13.

The switching plate 13 has a base body 15, which gives the Schaltpatte 13 its shape. In particular, it may be provided that the base body 15 has a base 16, with an inner side 17 and an outer side 18.

On the inside 17 of the base 16, a first leg 19 and a second leg 20 is arranged, wherein the base 16 together with the two legs 19, 20 has the U-shaped shape.

Furthermore, it is provided that the two legs 19, 20 are arranged parallel to each other.

On the first leg 19, a first sliding surface 21 is formed and on the second leg 20, a second sliding surface 22 is formed. The two sliding surfaces 21, 22 limit the receiving space 14 of the switching plate 13 and are in the installed state of the switching device 1 to the shift sleeve.

It is preferably provided that the switching plate 13 is formed symmetrically with respect to a median plane 23. The center plane 23 is arranged centrally of the two sliding surfaces 21,22.

Furthermore, a milling projection 24 is formed on the inner side 17 of the base 16. In particular, it is provided that the inner side 17 of the base 16 is formed in the region between the two sliding surfaces 21, 22 by a flat surface and that the milling projection 24 is formed as a projection on the flat surface. Furthermore, it can be provided that the milling projection 24 has a rectangular cross section with rounded corners on the base surface.

The milling projection 24 may be formed as a cylindrical body and therefore at the base surface and at its top surface have a same cross-section. Alternatively, it is also conceivable that the milling projection 24 is formed, for example, trapezoidal. In addition, it is also conceivable that the milling projection 24 is conical, for example in the form of a truncated cone formed. The milling projection 24 can in principle have any shape of the base surface or the elevation.

In particular, it is provided that a cover surface 25 of the milling projection 24 is formed as a flat surface. Furthermore, it is provided that the milling projection 24 has a height 26, wherein the height 26 between the inner side 17 of the base 16 and the top surface 25 of the milling projection 24 is measured.

The height 26 of the Fräsvorsprunges 24 may be between 0.2 mm and 2 mm, in particular between 0.3 mm and 0.5 mm.

A height 27 of the leg 19, 20 may be between 1.5 mm and 10 mm, in particular between 2.9 mm and 3.5 mm.

In particular, it is provided that the height 26 of the milling projection 24 is between 5% and 30%, in particular between 10% and 15% of the height 27 of the leg 19, 20. The two legs 19, 20 preferably have a same height 27.

Furthermore, it can be provided that on the outer side 18 of the base 16, a fastening pin 29 is arranged. The fastening pin 29 is preferably formed centrally on the outer side 18 of the base 16. The fastening pin 29 is used in particular to be able to attach the switching plate 13 on the leg 4 of the switching element 3 can.

In Fig. 3, the shift fork 1 is shown in a semi-finished state in which the Schaltpatte 13 is just inserted into the switching element 3, again for the same parts the same reference numerals or component names are used as in the previous figures 1 and 2. In order to avoid unnecessary repetition, reference is made to the detailed description in the preceding Figures 1 and 2 or reference.

FIG. 4 shows the shift fork 1 in the state joined to the shift plate 13, with the same reference numerals and component designations being used again for the same parts as in the preceding FIGS. 1 to 3. To avoid unnecessary repetition, reference is made to the detailed description in the preceding figures 1 to 3 or reference. The plain bearing barrels 11 are not yet mounted in the illustration of FIG. 4.

In Fig. 1, the shift fork 1 is shown in the fully assembled state together with the plain bearing barrels 11.

The method for assembling the switching device 1 will be described with reference to FIGS. 1 to 4, wherein in particular the Figs. 3, 4 and 1 in the enumerated order represent the various stages of manufacturing the switching device 1.

As can be seen from FIG. 3, it can be provided that a passage 30, which serves to receive the switching plate 13, is formed on the leg 4 of the switching element 3. In particular, it can be provided here that the passage 30 has a tab 31 which is partially punched out and bent back.

Characterized in that the tab 31 is bent back, a receiving space 32 is formed in the passage 30, in which the switching plate 13 can be inserted or received. In particular, it is provided in this case that the outer side 18 of the base 16 of the switching plate 13 is used in the assembled state on the inner side of the leg 5 in the leg 4 of the switching element 3 and rests against the tab 31 of the setting 30.

Furthermore, it can be provided that in the tab 31 of the passage 30, a receiving hole 33 is formed, in which the fixing pin 29 of the switching plate 13 can be inserted.

When the switching plate 13 is received in the receiving space 32 of the passage 30, it can be provided that the fixing pin 29 protrudes on the outer side of the leg 6 opposite the receiving hole 33 and the protruding portion of the fixing pin 29 can be formed into a mushroom head 34.

The mushroom head 34 serves to secure the Schaltpattens 13 in the switching element 3rd

It is further provided that a length 35 of the fastening pin 29 is greater than a thickness 36 of the tab 31. In particular, it may be provided that the length 35 of the fixing pin 29, the thickness 36 of the tab 31 in the non-welded state between 0.5 mm and 4 mm surmounted.

The individual method steps for assembling the switching device 1 will be described below. In a first method step, the switching element 3 is provided. For this purpose, the switching element 3 is punched out of a flat sheet metal part, wherein the basic shape of the switching element 3 is produced by this process. At the same time or subsequently it can be provided that the passage 30 is produced in a combined punching and bending operation on the leg 4 of the switching element 3.

In a subsequent operation, the switching element 3 is bent, wherein the two legs 4 of the switching element 3 are bent to its U-shape.

Parallel to the provision of the switching element 3, the guide element 2 can be provided. This can also be provided by a variety of punching, bending and joining operations.

In a subsequent joining operation, the switching element 3 can be joined to the guide element 2. In this case, in particular a laser welding can be used.

In order to produce the switching device 1 as accurately as possible, it can be provided that the guide element 2 is held at its longitudinal ends 10 by means of a clamping device during this joining process. The switching element 3 can be gripped or clamped on a positioning recess 38.

In a subsequent operation, the switching plates 13 can be inserted into the receiving space 32 of the legs 4 and then their attachment pin 29 are deformed on the outside of the leg 6 to a mushroom head 34. The mushroom head 34 can be produced by any thermal forming process. It is preferably provided that the mushroom head 34 is produced by an ultrasonic welding process.

In a subsequent method step, the preassembled shift fork, as shown in Fig. 4, are stretched at the longitudinal ends 10 of the guide element 2 and then the milling projection 24 of at least one of the Schaltpatten 13 can be machined, so that a jaw width 37, which by the distance between the two top surfaces 25 of the Fräsvorsprünge 24 is defined reaches a defined target dimension. In addition, the Fräsvorsprunge 24 can be removed to different degrees, so that not only the size but also the position of the mouth 27 can be made according to the requirements.

Disc milling cutters can preferably be used in order to be able to machine the milling projection 24 mechanically.

In a subsequent completion step according to FIG. 1, the plain bearing barrels 11 can be arranged and fixed at the longitudinal ends 10 of the guide element 2.

The embodiments show possible embodiments, it being noted at this point that the invention is not limited to the specifically illustrated embodiments thereof, but also various combinations of the individual embodiments are possible with each other and this variation possibility due to the teaching of technical action by representational invention in Can the expert working in this technical field.

The scope of protection is determined by the claims. However, the description and drawings are to be considered to interpret the claims. Individual features or combinations of features from the illustrated and described different embodiments may represent for themselves inventive solutions. The task underlying the independent inventive solutions can be taken from the description. All statements of value ranges in the present description should be understood to include any and all sub-ranges thereof, e.g. is the statement 1 to 10 to be understood that all sub-areas, starting from the lower limit 1 and the upper limit 10 are included, ie. all sub-areas begin with a lower limit of 1 or greater and end at an upper limit of 10 or less, e.g. 1 to 1.7, or 3.2 to 8.1, or 5.5 to 10.

For the sake of order, it should finally be pointed out that for a better understanding of the construction, elements have been shown partially unevenly and / or enlarged and / or reduced in size.

LIST OF REFERENCE NUMERALS 1 switching device 31 tab through 2 guide element 32 receiving space 3 switching element 33 receiving hole 4 leg switching element 34 mushroom head 5 inner leg 35 length fastening pin 6 Schenkelaußenseite 36 thickness tab 7 base leg switching element 37 jaw width 8 free end leg 38 Positioning recess 9 first bearing element switching element 10 longitudinal end guide element 39 Scheibenfräser 11 plain bearing barrel 12 second bearing element 13 switching plate 14 receiving space switching plate 15 basic body 16 base body 17 inside base 18 outside base 19 first leg switching plates 20 second leg switching plates 21 first sliding surface 22 second sliding surface 23 median plane 24 milling projection 25 top surface milling projection 26 height milling projection 27 height leg 28 inlet curvature 29 Fixing pin 30 Adjustment

Claims (17)

claims 1. switching plate (13) for a switching device (1) of a transmission, with a U-shaped base body (15) having a base (16) and on an inner side (17) of the base (16) then a first leg (19 ) and a second leg (20), wherein on the first leg (19) a first sliding surface (21) is formed and on the second leg (20) a second sliding surface (22) is formed, wherein the two sliding surfaces (21, 22) are each other, characterized in that on the inside (17) of the base (16) has a milling projection (24) is formed. 2. Schaltpatte according to claim 1, characterized in that the Fräsvorsprung (24) is in the form of a cylinder which rises from the inside (17) of the base (16) and which is spaced from the two sliding surfaces (21, 22) , 3. switching plate according to claim 1 or 2, characterized in that on the outer side (18) of the base (16) a fastening pin (29) is arranged, by means of which the base body (15) in the switching device (1) can be fixed. 4. switching plate according to one of the preceding claims, characterized in that on the sliding surfaces (21,22) an inlet curvature (28) is formed. 5. switching device (1) for a transmission, the switching device (1) comprising: - a guide element (2), which serves for the slidable receiving the switching device (1) in the transmission, and - a switching element (3), which for displacing a sliding sleeve is used, wherein the switching element (3) comprises two legs (4) which are arranged U-shaped to each other, wherein it is provided that the sliding sleeve between the two legs (4) of the switching element (3) fits, said two legs ( 4) of the switching element (3) are coupled to the base (7) with the guide element (2) and wherein at the free-projecting ends (8) of the two legs (4) in each case a switching plate (13) is arranged, characterized in that the Schaltpatten (13) according to one of the preceding claims are formed and that at least on one of the switching plates (13) of the cutting projection (24) is machined. 6. Switching device (1) according to claim 5, characterized in that on the leg (4) of the switching element (3) has a passage (30) is formed, in which the switching plate (13) is accommodated. 7. Switching device (1) according to claim 5 or 6, characterized in that in the leg (4) of the switching element (3), in particular in a tab (31) of the passage (30), a receiving hole (33) is arranged, in which the fixing pin (29) of the switching plate (13) is received. 8. Switching device (1) according to claim 7, characterized in that the fastening pin (29) of the switching plate (13) on the back of the leg (4) of the switching element (3) is secured. 9. switching device (1) according to claim 8, characterized in that the fastening pin (29) of the switching plate (13) on the back of the leg (4) of the switching element (3) is secured by a projecting part of the fastening pin (29) plastically transformed into a mushroom head (34). 10. A method for producing a switching device (1) according to one of the preceding claims, characterized in that the method comprises the following method steps: - providing the switching element (3); - Providing the switching plate (13); - Attaching the switching plate (13) on the switching element (3); - Machining the Fräsvorsprunges (24) on the Schaltpatte (13). 11. The method according to claim 10, characterized in that the switching element (3) is punched out of a flat sheet metal part, wherein in a punching-bending process, a passage (30) on the legs (4) of the switching element (3) is produced and in one subsequent bending process, the legs (4) of the switching element (3) are brought into their final form. 12. The method according to claim 10 or 11, characterized in that for providing the switching element (3), this with a guide element (2) is welded, wherein the guide element (2) has an elongated extension with two longitudinal ends (10), in particular a laser welding process is performed. 13. The method according to claim 12, characterized in that when welding the switching element (3) with the guide element (2), the guide element (2) at the two longitudinal ends (10) is held and that the switching element (3) on in the base ( 7) arranged Positionierausnehmungen (38) is held. 14. The method according to any one of claims 10 to 13, characterized in that the switching plate (13) is thereby fastened to the switching element (3) that the fixing pin (29) of the switching plate (13) from a leg inner side (5) forth in the receiving hole (33) in the leg (4) of the switching element (3) is inserted and on a Schenkelaußenseite (6) by a thermal process, in particular by an ultrasonic welding process, plastically deformed to a mushroom head (34). 15. The method according to any one of claims 11 to 14, characterized in that during the mechanical processing of the Fräsvorsprunges (24) on the Schaltpatten (13) the guide element (2) at the two longitudinal ends (10) is held. 16. The method according to any one of claims 11 to 15, characterized in that the milling projection (24) is machined by means of a side milling cutter. 17. The method according to any one of claims 11 to 16, characterized in that after the mechanical processing of the Fräsvorsprunges (24) on Schaltpatten (13) Gleitlagertonnen (11) at the two longitudinal ends (10) of the guide element (2) are arranged.