DE102007028110A1 - Shaft-hub connection, in particular a shift fork unit, and method for producing such a shaft-hub connection - Google Patents

Abstract

The present invention discloses a shaft-hub connection and a method for the manufacture of a vehicle transmission suitable. There are corresponding recesses or projections on the mutually engaging radial inner lateral surfaces of a hub or sleeve (14) and outer circumferential surfaces of a shaft (12) are provided. The at least one projection, which engages in the corresponding recess, is plastically deformed.

Description

Field of the invention

The The present invention relates to a shaft-hub connection with the Features of the preamble of claim 1, in particular for use with shift forks in manual transmissions. The invention further relates a method of making such a shaft-hub connection with the features of the preamble of claim 12.

at Driven in many places pods or Hubs are fixed on shafts. These pods are supposed to be not in certain applications move or twist the shaft. Currently, in general Sleeves used, pushed on the shaft and with this be pressed. To achieve an additional backup, can Both components are then pierced together. This ensures that the drill holes exactly on top of each other lie. Through the hole a spiral pin is pressed, prevents slippage of the components against each other. The described Operation is complex and therefore expensive. It is a Spiral pin required as an additional component. In addition, there is a risk that pulled a tug during pinning can be. If this is not noticed and remains easily solvable hang on the assembly, such a chip can easily in get the transmission and significant transmission damage to lead.

The DE 32 48 197 A1 describes a hub mount on a fan impeller that does not require additional components. Here are radially open recesses in the bottom disc of a fan wheel filled with hub material. Namely, over the bottom disc projecting hub material is plastically deformed under high pressure and pressed into the recesses, whereby a positive and non-positive connection is formed.

The compound described in the present application is particularly suitable for use as a shaft-hub connection in shift forks of vehicle transmissions. Such shift forks are for example in DE 101 59 441 A1 and DE 103 09 407 A1 shown. The DE 103 09 407 A1 describes a shift fork with a fork-shaped body and with a guide. In this guide, a switching element, such as a shift rod or a sliding or rolling bearings is introduced.

One The primary object of the invention is to provide a simple, stable and cost-effective connection between a shaft, in particular a shaft in the shift fork unit of a vehicle transmission, and a sleeve or hub to produce a slipping prevents the components against each other.

This The aim of the invention is with the subject of the independent Achieved. Features of advantageous developments of the invention result from the dependent claims.

A first embodiment of an inventive Shaft has in its outer circumferential surface at least a depression on. The hub or sleeve used has in its inner circumferential surface a corresponding section on, in the recess on the outer circumferential surface engages the shaft. The section in the inner surface of the Hub is plastically deformed and can continue through another step be deformed so that it optimally adapts to the depression. This can be done for example by caulking. In this way is a perfectly secured against loosening or twisting form- and non-positive connection of the sleeve or hub reached on the shaft, so that also easily large Forces and torques can be transmitted.

According to one alternative embodiment, the shaft in its outer circumferential surface at least one increase. The hub or sleeve used contains in its inner circumferential surface a corresponding Deepening, in which the increase of the outer circumferential surface engages the shaft. In this variant is preferably a Hollow shaft used to plastic deformation from inside thus achieve a positive connection of the two parts to be able to. The plastic deformation can, for example, by pressure forming done with the help of a pressure fluid.

by virtue of the additional plastic adaptation of the corresponding Recesses or sections on shaft and sleeve or hub creates a solid and secure positive and non-positive Connection, in which slipping of the two components against each other is impossible.

The Shaft-hub connection described here is in particular at one Shift fork unit of a vehicle transmission used. The connection contains corresponding recesses or projections on the mutually engaged radial inner circumferential surfaces a hub or sleeve and outer circumferential surfaces a wave. The at least one projection which fits into the corresponding recess engages, is plastically deformed.

According to a preferred embodiment, the hub includes at least one recess on the inner circumferential surface and the shaft at least one projection on the outer circumferential surface. According to a further embodiment, the hub has a plurality of recesses and the outer circumferential surface of the shaft the same number of protrusions. Similarly, in the alternative embodiment, a plurality of projections on the inner circumferential surface of the hub or sleeve and a plurality of corresponding recesses may be provided on the outer circumferential surface of the shaft.

at the shaft-hub connection according to the invention the hub or sleeve over its circumference with the Wave pressed. According to another embodiment can the hub or sleeve over its circumference with glued to the shaft and / or materially connected. Here, any method known to those skilled in the production of be used a cohesive connection.

The Recesses on the outer surface of the shaft or on the inner lateral surface of the hub or sleeve can, for example, introduced by means of a machining process be. In this way you can almost any contours be formed. Then it makes sense to the parts to deburr. This is especially important to avoid that Chips get into the gearbox and cause considerable consequential damage to lead.

For example The wells can be in the form of one or more Holes mounted on the outer surface of the shaft become. The solid connection with the correspondingly shaped Hub or sleeve can be made by pressure forming. The projections arranged on the inner circumferential surface or webs are positively by plastic deformation in the corresponding recesses on the outer circumferential surface pressed in the shaft.

According to one Another embodiment, the connection between at least a cleared and / or pushed depression on the inner circumferential surface of the sleeve or hub and a pressure-formed hollow shaft produced. The pressure-formed Hollow shaft contains on the outer circumferential surface arranged projections or webs. These projections become by plastic deformation positively in the corresponding recesses on the inner circumferential surface the hub or sleeve pressed.

A particularly easy and inexpensive to manufacture variant The invention may also provide that in the hub or sleeve a Through hole or more through holes are introduced, which are usefully oriented at an angle of about 90 degrees to the sleeve axis. However, the through holes can also be inclined be arranged to this axis, which possibly for reasons of space can be useful. During the subsequent pressure forming is in the inner portions of these holes the hollow shaft material pressed into it, the hollow shaft in these areas is plastically deformed. The webs or projections produced thereby the shaft form a positive connection with the Hub or sleeve, so that a torsion-resistant and heavy-duty Wave-hub connection is created. The forming process takes place For example by means of hydraulic pressure in a high pressure forming process. These methods are known in the art and therefore need this point will not be specified.

Of Another is a method of making a shaft-hub connection described. The shaft-hub connection is in particular at a shift fork unit a vehicle transmission used and has corresponding recesses or projections on the engaged with each other radial inner circumferential surfaces of a hub or sleeve and outer circumferential surfaces of a shaft. there is the at least one projection by plastic deformation in pressed the corresponding recess.

at the method, the hub or sleeve over their Scope with the shaft pressed, glued and / or otherwise cohesively get connected.

The Recesses on the outer surface of the shaft or on the inner lateral surface of the hub or sleeve can optionally by means of a machining process or introduced by chipless manufacturing processes.

For example a pressure-formed hub or sleeve is used, the arranged on its inner circumferential surface projections or webs contains. These become positive by plastic deformation in the corresponding recesses on the outer circumferential surface pressed in the shaft.

According to one Another embodiment is a pressure-formed hollow shaft used, whose arranged on the outer circumferential surface Protrusions or webs by plastic deformation form-fitting in the corresponding recesses on the inner circumferential surface the hub or sleeve are pressed.

To make the shaft-hub connection, the connection of a single recess and a single corresponding projection can be used. In order to achieve a higher stability of the connection, the hub preferably has at least two depressions or projections and the shaft also has at least two corresponding projections or depressions. These at least two connecting elements can be so order that they are arranged on the shaft or hub respectively opposite one another.

The Further depression does not have to be in the form of a (through) hole. It is also a blind hole or a corresponding, non-continuous Material recess possible, in which the corresponding Increase engages. Then there are also depressions and corresponding projections possible, the extending over the entire circumference of the shaft and hub, so that the connection at the junction over the entire circumference of the shaft - annularly enclosing - made becomes.

The The invention relates firstly to the compound per se and on the other hand, the process for preparing this compound.

Further Features, objects and advantages of the present invention will be apparent The following detailed description of a preferred embodiment of the invention, as a non-limiting example serves and refers to the accompanying drawings. Identical components basically have the same reference numerals on and are sometimes not explained several times.

1 shows a shift fork assembly with a guide for a shaft in which the shaft and the guide are connected to each other according to the invention;

2 shows a cross-sectional view in which was cut through the guide and

3 shows a detail of the enlarged cross-sectional view.

A possible embodiment of a connection between a shaft and a sleeve or hub with inventive compound is based on 1 illustrated. The 1 shows the construction of a shift fork unit. This consists of a fork-shaped body 20 and a guide 14 , The main body 20 is made for example of sheet metal or other dimensionally stable material. It can also be a cast component.

The leadership 14 is a sleeve or hub and has a guide hole in which a shaft 12 to be led. Furthermore, the leadership points 14 on its outer surface a depression 16 and at a corresponding position of the inner surface of a projection 15 (see. 2 ) on. The shift fork 20 also has sliding shoes on both fork ends 22 on. These are for example made of plastic and are plugged or fitted.

The detailed representations of the 2 and 3 illustrate the connection between sleeve 14 and wave 12 , The wave 12 has in the illustrated embodiment, two oppositely disposed holes 13 on, which are each designed as blind holes. The increases already described above 15 within the inner circumferential surface of the sleeve 14 each grab in the holes 13 one. These holes 13 are deburred and / or chamfered, so that any remaining chips can not interfere with the intervention.

The compound is made by first of all the undeformed sleeve 14 over the wave 12 pushed and put in the right position. After the sleeve 14 is properly positioned, the opposite recesses 16 pressed on the outside of the sleeve, whereby the material begins to flow and by means of plastic deformation as elevations 15 designated pin on the inner circumferential surface of the sleeve 14 in the corresponding wells or holes 13 on the outer circumferential surface of the shaft 12 be pressed.

In Accordingly, a kinematic reversal of the described Type of connection (not shown) by a hollow shaft is used by pressure forming with a hub or sleeve is connected, which cleared on its inner surface or has bumped depressions. In these depressions become webs or elevations by means of plastic deformation the outer circumferential surface of the shaft pressed.

The The invention is not limited to the above embodiments limited. Rather, a variety of variants and Modifications conceivable that of the invention Use your thoughts and therefore also in the protection area fall.

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

• - DE 3248197 A1 [0003]
• - DE 10159441 A1 [0004]
• - DE 10309407 A1 [0004, 0004]

Claims (16)

Shaft-hub connection of a shift fork assembly of a vehicle transmission with corresponding recesses and projections on the mutually engaged radial inner lateral surfaces of a hub or sleeve ( 14 ) and outer circumferential surfaces of a shaft ( 12 ), characterized in that the at least one projection, which engages in the corresponding recess, is plastically deformed. Shaft-hub connection according to claim 1, characterized by at least one recess on the outer circumferential surface of the shaft ( 12 ), in which a corresponding, plastically deformed portion or projection on the inner circumferential surface of the hub or sleeve ( 14 ) intervenes. Shaft-hub connection according to claim 1, characterized by at least one depression on the inner lateral surface of the hub or sleeve ( 14 ), in which a corresponding, plastically deformed portion or projection on the outer circumferential surface of the shaft ( 12 ) intervenes. Shaft-hub connection according to one of claims 1 to 3, characterized in that the hub or sleeve ( 14 ) over its circumference with the shaft ( 12 ) is compressed. Shaft-hub connection according to one of claims 1 to 4, characterized in that the hub or sleeve ( 14 ) over its circumference with the shaft ( 12 ) bonded and / or materially connected. Shaft-hub connection according to one of the preceding claims, characterized in that the recesses on the outer circumferential surface of the shaft ( 12 ) or on the inner lateral surface of the hub or sleeve ( 14 ) are introduced by means of machining. Shaft-hub connection according to claim 6, characterized by a bore ( 13 ) or several holes ( 13 ) on the outer surface of the shaft ( 12 ). Shaft-hub connection according to claim 6, characterized by a pressure-shaped hub or sleeve ( 14 ), whose projections are arranged on its inner lateral surface ( 15 ) or webs by plastic deformation form-fitting manner in the corresponding recesses on the outer circumferential surface of the shaft ( 12 ) are pressed. Shaft-hub connection according to claim 6, characterized by at least one recessed and / or pushed depression on the inner circumferential surface of the sleeve ( 14 ) or hub. Shaft-hub connection according to claim 9, characterized by a pressure-shaped hollow shaft, whose arranged on the outer lateral surface projections ( 15 ) or webs by plastic deformation positively into the corresponding recesses on the inner circumferential surface of the hub or sleeve ( 14 ) are pressed. Shaft-hub connection according to claim 9 or 10, characterized in that the hub or sleeve ( 14 ) has at least one through hole into which projections ( 15 ) or webs of the hollow shaft are pressed into it. A method for producing a shaft-hub connection of a shift fork unit of a vehicle transmission, characterized by the following steps, • that the corresponding recesses or projections on the mutually engaged radial inner lateral surfaces of a hub or sleeve ( 14 ) and outer circumferential surfaces of a shaft ( 12 ), and • that the at least one projection ( 15 ) is pressed by plastic deformation in the corresponding recess. A method according to claim 12, characterized in that the hub or sleeve ( 14 ) over its circumference with the shaft ( 12 ) is pressed, glued and / or materially connected. A method according to claim 12 or 13, characterized in that the depressions on the outer circumferential surface of the shaft ( 12 ) or on the inner lateral surface of the hub or sleeve ( 14 ) are introduced by means of a machining process. Method according to one of claims 12 to 14, characterized by a pressure-shaped hub or sleeve ( 14 ), whose projections are arranged on its inner lateral surface ( 15 ) or webs by plastic deformation form-fitting manner in the corresponding recesses on the outer circumferential surface of the shaft ( 12 ). Method according to one of claims 12 to 14, characterized by a pressure-formed hollow shaft, whose arranged on the outer circumferential surface projections ( 15 ) or webs by plastic deformation positively into the corresponding recesses on the inner circumferential surface of the hub or sleeve ( 14 ).