WO2008077735A1

WO2008077735A1 - Gear shift fork device

Info

Publication number: WO2008077735A1
Application number: PCT/EP2007/063423
Authority: WO
Inventors: Klaus Krämer
Original assignee: Schaeffler Kg
Priority date: 2006-12-22
Filing date: 2007-12-06
Publication date: 2008-07-03
Also published as: DE102006061126A1; CN101558256A

Abstract

The invention relates to a gear shift fork device for a manual transmission. The invention is based on the task of creating a gear shift fork device for a manual transmission which is distinguished by high wear resistance and which can be produced advantageously from manufacturing technical points of view. According to the invention, this objective is accomplished by a gear shift fork device for a manual transmission with a fork body which has at least one shifting flank (1, 2), a sliding block seat section (3, 4) formed at the switching flank, at least one recess (9) formed in the sliding block seat section, a sliding block structure (5, 6) with a bearing surface (12) seated on the sliding block seat section, and a sliding surface (5a, 6a) facing away from the bearing surface, wherein the sliding block structure has an overhang (7) protruding over the bearing surface and penetrating into the recess of the sliding block seat section, wherein said gear shift fork device is characterized in that the overhang forms an anchoring peripheral surface (8) which is seated at the inner peripheral wall (9a) of the recess and is thereby anchored. By these means, it becomes advantageously possible to fasten a sliding block structure, produced from a relatively thin layer of material, securely to the assigned shifting flank in a manner which can be controlled well by process engineering.

Description

Name of the invention

Shift fork device

description

Field of the invention

The invention relates to a shift fork device for a manual transmission with a fork body having at least one switching edge with a Gleitsuhuhsitzabschnitt, wherein on this Gleitschuhsitzabschnitt a Gleitschuhstruktur is arranged on a Gleitschuhsitzabschnitt facing outer surface forms a sliding surface.

From DE 10 126 436 A1 a shift fork for a vehicle transmission is known, which has a fork-shaped body. The main body forms two switching flanks, which are each provided in their end region with a shoe made of a brass material. The main body is made of a steel material. The shoes are materially connected by resistance welding to the body and so far highly secured to the body.

From JP 7-133865 A also a shift fork device for a transmission is known, which has a provided with a Gleitschuhstruktur switching edge. The shoe structure is made of a plastic material in this conventional shift fork device. The switching edge is provided with a bore in the region of the sliding shoe seat section provided for receiving the sliding shoe. In this hole, a connecting pin is used, on which the corresponding cheeks of the shoe structure are welded by an ultrasonic welding process. The invention has for its object to provide a Schaltgabeinrichtung for a manual transmission, which is characterized by a high wear resistance and is inexpensive to produce under manufacturing aspects.

This object is achieved by a shift fork device for a manual transmission with:

a fork body having at least one switching edge,

a sliding shoe seating section formed on the switching flank, at least one recess formed in the sliding shoe seating section,

a sliding shoe structure having a seat surface seated on the sliding shoe seat portion and a sliding surface facing away from the seat surface,

wherein the sliding shoe structure has a protruding beyond the seat surface and penetrating into the recess of the Gleitschuhsitzabschnitts,

- In which this shift fork device is characterized in that the LJ supernatant forms an anchoring peripheral surface which is seated on the inner peripheral wall of the recess and anchored thereby.

As a result, it is possible in an advantageous manner to fasten a sliding shoe structure made of a relatively thin material layer sufficiently reliably to the associated switching flank in a manner which is easy to control in terms of process technology.

According to a particularly preferred embodiment of the invention, the anchoring of the sliding shoe structure takes place in that the anchoring circumferential surface formed by the projection is seated on the inner peripheral wall of the recess under radial pressure. In this case, it becomes possible in particular to anchor the sliding shoe structure in the recess in a force-fitting manner.

It is also possible, in particular by appropriate design of the recess to anchor the integrally formed with the Gleitschuhstruktur supernatant in the recess form fit. This positive anchoring tion can in particular be achieved by an annular groove formed in the, formed in the switching edge recess immediately below the front peripheral edge of the same.

It is possible to make the sliding shoe structure such that it has a projection which is designed in the manner of a short, but solid cylinder journal in relation to the diameter, which as such is pressed into the recess. This design is particularly suitable for the realization of the Gleitschuhstruktur of materials with a high modulus of elasticity.

The inventive concept for anchoring the Gleitschuhstruktur on the switching edge of a shift fork device is particularly suitable for the realization of the Gleitschuhstruktur of a plastically deformable metal material. This metal material can be a homogeneous metal alloy with corresponding sliding functional properties. Preferably, however, the sliding shoe structure is made of a metal material portion having a plurality of material layers with different material properties. In this case, the material layer adjacent to or forming the sliding surface may in particular be formed from a material with a suitable microstructure selected with regard to advantageous sliding properties. The lower-lying layers of material, in particular adjacent to the seat surface, can be designed so that on the one hand they enable effective support of the sliding material layer and, on the other hand, a particularly secure anchoring of the sliding shoe structure on the switching flank.

According to a particularly preferred embodiment of the invention, the fastening of the shoe shoe structure, initially equipped as sliding shoe platelets, takes place by pressing in and thereby plastic deformation of a material section initially covering the recess. The projection can in particular be dimensioned in this case such that its axial length measured in the pressing-in direction is smaller than the diameter of the recess. The supernatant can be formed here as a cup-like sinking be, this supernatant is effectively stiffened in the radial direction by the bottom surface of this cup structure in the radial direction. The axial length of the supernatant preferably corresponds at least to 1.5 times the thickness of the metal plate and is preferably shorter than the diameter of the recess.

According to a particularly preferred embodiment of the invention, the sliding shoe plate is designed such that it has an edge web. By means of this edge web, on the one hand, a switching edge inner surface can be covered, on the other hand, this also stiffens the sliding shoe plate.

The inventive concept for equipping a shift fork device with a sliding shoe structure is particularly suitable for shift fork devices which have two switching flanks. The sliding shoe structure according to the invention can in this case be attached to the respective switching flanks both on an engaging side and on a disengaging side of the respective switching flank.

Brief description of the drawings

Further details and features of the invention will become apparent from the following description taken in conjunction with the drawings. It shows:

1 shows a perspective view for illustrating a preferred embodiment of a shift fork device according to the invention for a manual transmission, including a sketch to illustrate the anchoring of a sliding shoe plate, FIG.

FIG. 2 shows a perspective detail of a sliding shoe plate used to form a sliding shoe structure according to the invention, FIG. 3 is also a perspective view of the slide shoe plate for illustrating the inner seat surface thereof;

FIG. 4 is a perspective view for illustrating the construction of a sliding shoe plate according to the invention in a compressed state,

Figure 5 is a perspective view illustrating the formed in the compressed state in the region of the seat surface of the Gleitschuh- platelets supernatant.

Detailed description of the drawings

The shift fork device S shown in FIG. 1 comprises a fork body which, for example, is manufactured by drawing / bending deformation from a sheet steel material. The fork body comprises a first switching flank 1 and a second switching flank 2. Each of these switching flanks 1, 2 forms a sliding shoe seat section 3, 4, on which a sliding shoe structure 5, 6 is seated. Each of the Gleitschuhstrukturen 5, 6 forms a not visible in this illustration, on the respective Gleitschuhsitzabschnitt 3, 4 seated seat 12 (see Figures 3 and 5) and in this view facing the viewer sliding surface 5a, 6a.

The shift fork device S is characterized in that the respective shoe structure 5, 6 has a projecting over the seat 12 and penetrating into the fork body supernatant 7, wherein the supernatant 7 forms an anchoring peripheral surface 8, which is seated on the inner peripheral wall 9 of the recess 9a and thereby is anchored.

In the embodiment shown here, the anchoring of the anchoring circumferential surface 8 takes place in the recess 9a under radial pressure of the material of the supernatant 7. In the embodiment shown here, the recess 9 is designed so that it is slightly widened inwardly, so the supernatant 7 is also anchored in the recess 9a in a form-fitting manner. The supernatant 7 is formed by pressing in corresponding punch elements into a material section of the sliding shoe plate 10 that first covers the respective recess 9a. The supernatant 7 results here by Ziehumformung.

In the embodiment shown here, the Gleitschuhstrukturen 5, 6 are made of a flat material. This flat material is in particular a plastically deformable metal material. This metal material may have a plurality of layers of material, with the material layers adjacent to the sliding surfaces 5a and 6a being designed as sliding functional surfaces, whereas the underlying material layers may be configured such that they primarily serve as carrier layers and the high-strength anchoring of the sliding shoe structure to the respective Switching edge 1, 2 serve.

As is further apparent from the illustration according to FIG. 1, the projection 7 is dimensioned such that its axial length L measured in the pressing-in direction is smaller than the diameter D of the recess. The diameter D of the recess preferably corresponds to at least 4 times the thickness t of the sliding shoe plate 10 used to form the sliding shoe structures 5, 6.

In the embodiment shown here, each shoe structure 5, 6 is provided with two projections 7 and anchored on the fork body. The formed on the switching edges 1, 2 seat sections 3, 4 are designed as slightly opposite a face F lowered surface sections. The degree of lowering relative to the end face F is smaller than the thickness t of the sliding shoe plate 10.

FIG. 2 shows a slide shoe plate 10 made of a flat material for forming the sliding shoe structure attached to the shift fork device according to FIG. 1 in an initial state. This slide shoe plate consists of a plastically deformable metal material. The fixing of this flat material plate on the fork body according to FIG. 1 is carried out by initially placing it on the corresponding sliding shoe seat section 3, 4 and then plastically deforming a material section 7a, 7b covering the recess 9a (see FIG. 1) by pressing in a stamping device.

The Gleitschuhplättchen 10 shown here is provided with an edge web 11 which as such stiffen the Gleitschuhplättchen 10 and also forms a the inner wall of the respective switching edge 1, 2 overlapping cover layer can also act as a sliding contact or additional guide surface especially for special loads.

FIG. 3 shows the sliding shoe plate 10 with a view of its seat surface 12 provided for resting on the respective sliding shoe seat section 3, 4. The edge web 11 is formed such that its supernatant dimension U over the seat surface 12 at least equal to the material thickness of the flat material plate 10.

In FIG. 4, the flat material platelets deformed according to the invention into a sliding shoe structure anchored to the shift fork device are shown in a state in which this is already provided by plastic deformation with the projections 7 provided for anchoring in the corresponding anchoring recess 9 of the respective switching flank 1, 2. These projections 7 can, as shown here, from the side of the sliding surface 5a, 6a appear as a flat, cup-like recesses. If necessary, a closing or filling plug, likewise made of a sliding material, can be pressed into these countersinks.

In FIG. 5, the sheet material plate 10 converted into a sliding shoe structure according to the invention is shown with a view of the seat surface 12 which is actually seated on the corresponding seat surface 3, 4 of the fork body in this state. As can be seen, the two projections 7 form an outer surface acting as an anchoring circumferential surface 8, which under a high-strength Press fit in the corresponding recess of the respective switching edge 1, 2 sits.

The shift fork device according to the invention is particularly suitable for use in manual transmissions, in which relatively high temperatures can occur due to high relative speeds between the sliding shoe structures and the gear components guided by them. In the receiving bores already formed in the fork body in the area of the sliding shoe seat sections, the sliding shoes, which are preferably already partially preformed (for example, pre-formed at right angles), are pulled into the bores by plastic deformation (similar to Toxen).

Furthermore, it is possible to form preformed sliding shoes with corresponding warts and to press them into the fork bore. This is particularly advantageous in the realization of the sliding shoe structures made of materials with a high modulus of elasticity, since such sliding shoe structures can not or only to a limited extent plastically deform.

The sliding shoe structures according to the invention can in particular be made of bearing materials, such as, for example, a brass or bronze material, and in particular also a sheet metal or strip material coated with brass or bronze.

The sliding shoe structures according to the invention can furthermore consist of a carrier material, e.g. be made of a steel material which is provided with a sliding material, for example with a thickness of about 0.1 to 0.2 mm.

The shift fork device according to the invention is compared to plastic concepts considerably more temperature resistant and thus allows the leadership of components at high speed.

The inventive concept for fixing the Gleitschuhstrukturen is particularly suitable in the design of the shift fork devices as shift fork devices with an aluminum body. The inventive concept is particularly suitable for the realization of the shift fork device as a relatively narrow sliding sleeves, since the required for the realization of Gleitschuhstruktur band material can be made significantly thinner than is the case for example in the formation of Gleitschuhstrukturen of plastic materials.

The shift fork device according to the invention is characterized by a robust construction and thus also enables the transmission of high switching forces. The concept according to the invention also reduces the risk that the sliding shoe structures will be squeezed or sheared off.

Due to the inventively enabled radial approach to the sliding surfaces formed by the edge webs (in sliding sleeve bottom) can be intercepted on the respective sliding shoe, if necessary, large forces and possibly also transverse stresses.

In the embodiment of the supernatant 7 as a drawn cup section, the radial contact pressure of the peripheral wall 8 contributing to the anchoring of the sliding shoe plate can be built up on the inner circumferential surface 9a of the recess 9 with the aid of the material section forming the cup bottom. This material portion can in this case be loaded such that a slight flow of the material and thus a radial clamping of the supernatant 7 occurs. It is also possible to form the supernatant 7 even before applying the Gleitschuhplättchens 10 in this and make only after applying the Gleitschuhplättchens 10 a local deformation of the supernatant which leads to a sufficiently secure anchoring of Gleitschuhplättchens 10 on the corresponding edge 1, 2. In particular, for this variant, it is possible to form the bottom of the cup as initially slightly to the sliding surface in convex bulging bottom and to press flat after applying the Gleitschuhplättchens so that a radial Ausstemmung the peripheral edge portion 8 of the supernatant 7 takes place. The recess 9 can also be designed as a through hole. In this through hole, the projections 7 of two, on opposite sides of the switching edge 1, 2 arranged Gleitschuhplättchen 10 may be pressed so that the bottom surfaces of these mutually facing supernatants abut. It is possible to make these bottom surfaces so that they engage with each other, in particular are clinched.

Claims

claims

1. shift fork device for a manual transmission with:

a fork body having at least one switching edge (1, 2),

- One on the switching edge (1, 2) formed Gleitschuhsitzabschnitt (3, 4),

at least one recess (9) formed in the sliding shoe seat section (3, 4),

a sliding shoe structure (5, 6) having a seat surface (12) seated on the sliding shoe seat portion (3, 4) and a sliding surface (5a, 6a) facing away from the seat surface (12),

- Wherein the Gleitschuhstruktur (5, 6) on the seat surface (12) hervororkra- ing and in the recess (9) of the Gleitschuhsitzabschnitts (3, 4) penetrating supernatant (7)

- characterized in that the supernatant (7) an anchoring circumferential surface (8) which rests on the inner peripheral wall (9a) of the recess (9) and is anchored thereby.

2. shift fork device according to claim 1, characterized in that the protrusion formed by the projection (7) peripheral surface (8) on the inner peripheral wall (9 a) of the recess is seated under radial pressure

3. shift fork device according to claim 2, characterized in that the supernatant (7) by the anchoring circumferential surface (8) is anchored non-positively in the recess (9).

4. shift fork device according to claim 2, characterized in that the projection (7) by the anchoring circumferential surface (8) in the recess (9) is anchored positively.

5. shift fork device according to at least one of claims 1 to 4, characterized in that the projection (7) is pressed into the recess (9).

6. shift fork device according to at least one of claims 1 to 5, characterized in that the sliding shoe structure (5, 6) as a flat material plate (10) is executed.

7. shift fork device according to at least one of claims 1 to 6, character- ized in that the Gleitschuhstruktur (5, 6) is made of a metal material.

8. shift fork device according to claim 7, characterized in that the Gleitschuhstruktur (5, 6) has a plurality of material layers with different mate- rialigenschaften.

9. shift fork device according to at least one of claims 1 to 8, characterized in that the supernatant (7) by pressing and plastic deformation of the recess initially overlapping Materialab- section of a Gleitschuhplättchens (10) is formed.

10. shift fork device according to claim 1, characterized in that the projection (7) is formed by a over the seat surface (12) hervororkragenden solid pin.

11. shift fork device according to claim 1, characterized in that the recess (9) is designed as a circular cross-section recess, and that the projection (7) is dimensioned such that its measured in the press-fitting axial length (L) is smaller than the diameter ( D) of the recess (9).

12. shift fork device according to claim 1, characterized in that the Gleitschuhplättchen (10) with an edge web (11) is provided.

13. shift fork device according to claim 1, characterized in that in the seat portion (3, 4) has two recesses (9) are formed, and that the Gleitschuhplättchen (10) by two projections (7) in the Gleitschuh- seat portion (3, 4) is anchored.

14. shift fork device according to claim 1, characterized in that the sliding shoe structure (5, 6, 10) is made of a flat material

15. shift fork device according to claim 1, characterized in that the fork body is designed as a ring segment which extends over a circumferential angle of approximately 180 ° and which forms two switching flanks (1, 2) which each have seat sections (3, 4), wherein the seat portions (3, 4) formed by these switching flanks (1, 2) are diametrically opposed to each other with respect to a ring segment axis.