JP3496164B2 - Method for manufacturing a member connection part in a seat adjustment device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a member connection in a seat, in particular in an adjusting device for a motor vehicle seat, in which the members to be fixedly connected to each other are welded together in the connection area. Regarding

[0002]

PRIOR ART German Federal Patent No. 3303069
In the motor vehicle seat known from the specification, the side wall of the seat part and the backrest frame are connected to the reinforcing plate and the joint part by means of tacks. At least the side wall of the backrest frame has, in the region of the connecting hole in the joint part or the reinforcing plate, a bead which abuts against these members, which are welded to these members. In this welding process, open arc welding with a metal electrode is generally performed, and as is well known, a high temperature is generated in the members to be joined, stress is generated, and a thin member may be twisted. In some cases, heat treatment is required to reduce the stress on the component.

German Patent Application Publication No. 3246
From the '564 specification, a motor vehicle seat is known in which seat rails are provided on both sides of the seat.
Assembled from one profiled section plate into a rail with a substantially T-shaped cross section, one profiled section plate forms the load bearing profile, the other profiled section plate forms the holding profile and these profiles The materials are joined together by spot welding to form a T-shaped rail. Furthermore, these parts are connected to each other by spot welding in order to connect one joint part to the backrest and to connect the other joint part to the running rail. In this spot welding as well as in the arc welding described above, since the members to be joined together are heated strongly, the stress after cooling of the joined members also occurs, and this stress particularly increases the load bearing capacity of these members. In case of collision, it will decrease.

[0004]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a weld-bonded member joint in which the members to be joined are largely free from the thermal stresses associated with welded joints.

[0005]

In order to solve this problem, according to the present invention, a cutting member protruding toward the coupling side of one member is used.
The shape and size of the other part of the rib-like protrusions are almost the same
To the notch, which is pressed against this other member,
Then the capacitor discharge to both parts is
The contact area between the childlike protrusion and the notch is melted,
During the melting step both parts are pressed to these parts.
The final contact is made due to the attachment force.

[0006]

In order to join the components prepared as described above, capacitor pulse welding is suitable as butt welding. This is because the welding energy is obtained from the condenser. This is because the capacitor is charged to the required DC voltage during the welding interruption period, and this DC voltage is discharged during the welding process in a short time. Since a high density of energy is generated in the welding area only during an extremely short period of time, strong heating of the welded member and therefore no distortion occur. Great dimensional accuracy can be obtained because good heat conduction of the member is of secondary significance. Furthermore, no oxidation of the welded part occurs. In butt welding with capacitor discharge, the high current strength and the high resistance at the welding location control the pulling of the parts to be welded so that the areas of the parts to be joined melt. During this time, the notch on one member is pushed into the notch on the other member to close the notch. This is done, for example, by sandwiching the members to be joined into a spring biasing device. There is a very large force transmission in the welding area, and a suitable fit contributes to this force transmission.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In order to optimize the welding process, according to the structure of the present invention, the facet-shaped projection has a conical peripheral surface which starts from the base cross section and tapers to an end face smaller than this base cross-section. The notch for receiving the protrusion has a cross section slightly larger than the end face of the notch, and the cross section of this notch is smaller than the base cross section of the notch. For reasons of manufacturing technology, it is advantageous if the notch of one part and the notch of the other part have a circular circumference. However, this is not necessary and the facets on one member and the notches on the other member may have a polygonal perimeter.

In some cases, in order to allow the member to be fixedly fixed over a long coupling range, according to another configuration of the invention, one member is provided with a plurality of spaced apart facets. It has projections and the other member has the same number of notches provided at the locations matching these facets.

In order to accommodate the predetermined volume of material that melts during the welding process and is extruded during mutual pressing, according to an advantageous embodiment of the invention, at least one facet of both parts to be joined is The area is provided with a receiving pocket for the volume to be extruded. The receiving pocket is then constructed as an annular recess surrounding the notch in the member forming the mating partner and is provided on the side facing towards the facet, and the annular recess is radiused from the notch in the member. It is advantageous to start in a direction. However, it is also possible to form the annular recess as a groove that is formed slightly radially away from the notch in the member.

In order to be able to obtain a weld seam length larger than a circular facet projection at a more favorable weld seam load in the same overall space, according to an advantageous configuration of the invention, the facet of one member The protrusion has a triangular periphery of a conical peripheral surface, and the notch in the other member is configured as a triangular hole corresponding to the facet-shaped protrusion.

In order to generate only a small amount of heat during the welding process so that the facet protrusion is formed in one pressing process, the facet protrusion has a hole in the center, and the facet protrusion projects from the member. It is configured as a collar. To receive the volume that is extruded during welding, according to another feature of the invention, the member has an annular recess in the base of the protruding collar that forms a facet, which serves as a receiving pocket. This annular recess can be processed at the same time that the facet-shaped projection is formed on the member having the facet-shaped projection.

In order to produce the facets, a hole is first punched in the facet of the component and the wall area of the component surrounding the hole is simultaneously or immediately following as a collar to be pre-drawn into a cone. At the same time or at a subsequent stage, the base of the collar is formed with an annular recess that surrounds the facets and forms a receiving pocket. Insert the facets of one member into the notches of the other member, press this one member against the other member while maintaining the tightening force, and then perform capacitor discharge to these members, The member connection is produced by bringing the contact area between the notch and the notch into a molten state and the final contact of these members by the pressing force exerted on these members during this melting stage.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention is shown in the drawings and will be described below.

First of all, it should be pointed out that the figures only show the elements which are important for mutual coupling and for the understanding of the invention. For example, the eccentric ring rotating shaft for controlling the meshing of the toothed joint portion and its operating member and transmission member are not shown. Furthermore, the connection example shown in the drawings is only one of many possibilities, and that the connection of the parts is not limited to the parts used for fittings,
Please note. For example, the members of the device for moving the seat in the vertical direction, adjusting the height or adjusting the armrests, and the members such as the backrest frame and the seat part frame are connected to each other according to the present invention.

The side wall 10 of the seat portion shown in the figure has an arcuate bent portion 11 in its upper region, and below this bent portion 11,
There are two notches 12, for example circular, which are spaced apart from one another. A member 14 configured as a joint portion having a spur gear 13 to be punched out has facets 15 provided at intervals of the notches 12, and these facets 1
5 is formed in a truncated cone shape and is punched out from the member 14.
The conical peripheral surface 16 of each facet-shaped protrusion 15 is the facet-shaped protrusion 1
5 starts from the base section 17 and tapers to the end face 18. This end face 18 is smaller than the cross section of the notch 12,
The cross section of the notch 12 is slightly smaller than the base section 17 of the facet 15. The spur gear 13 meshes with the internal gear annular gear 20 of another member 19 that is configured as a joint portion, and this member 19 also has two facet protrusions 15 that are provided at a distance from each other. 15 is also formed as described above and has an end surface 18 of a cross section smaller than the base cross section 17. The facets 15 of the member 19 are
It is introduced into the cutout 12 of the member 21 which is configured as a holding arc piece. Bent portion 11 of member configured as side wall 10
The member 21 configured as a holding circular arc piece brings together the members 14 and 19 used as the joint portion in the axial direction in the coupled state shown in FIG. The member 14 having the spur gear 13 and used as a joint portion has a hole 22 concentric with the spur gear 13, and in the illustrated embodiment, this hole 22 is
Similarly, the hole 23 is slightly larger than the hole 23 in the member 19 forming the joint portion, and the hole 23 is concentrically provided with respect to the internal gear 20. In the embodiment shown in the figure, the internal ring gear 2
The number of teeth of 0 is larger than the number of teeth of the spur gear 13 by at least one tooth, and the root circle of the internal ring gear 20 is larger than the tip circle of the spur gear 13 by at least the height of the teeth. An eccentric dimension of about half the height of the tooth is created between and the center of the hole 23. An eccentric ring portion of a turning shaft (not shown) is fitted in the hole 22.

As in FIG. 2, the lower connecting area of the members 10 and 14 shown in FIG. 4 indicates the position of these members immediately before the welding process, and the notch 15 of the member 14 is the notch 12 of the member 10. I'm only a little worried. Member 10
4 has a receiving pocket 24 on the side facing the member 14,
In this embodiment, the receiving pocket 24 is configured as an annular recess 25 which surrounds the cutout 12 and extends radially from the edge of the cutout 12 to the side surfaces of the members 10 and 14 which are in contact with one another in the connected state. During that time, a free space is formed to accept the volume of material that is melted and extruded during the welding process.

In the embodiment shown in FIG. 5, the receiving pockets 24 in the member 10 are constructed and positioned differently, and the annular recess 25 'is constructed, for example, as a groove, which is slightly radial from the cutout 12. Member 10 at a distance
It is provided in. Obviously, the size of the receiving pocket 24 is related to the volume of material extruded by the welding process. The pre-compression that pushes members 10 and 14 together and the magnetic field acting around the electrodes affects the position of receiving pocket 24, and thus the receiving pocket is shown in FIGS.
As you can see, it is provided on the mating partner. However, it is also conceivable to provide it around the facets 15 of the member 14. Furthermore, a combination of these means is also possible.

FIG. 6 of the member 14 configured as a joint part
In the embodiment shown in FIG. 1, the facets 15 'have a triangular periphery with a conical peripheral surface so that the facets 15' have the same shape.
It is launched from 4. It is clear that the notch 12 'of the member 10 forming the mating partner is formed in conformity with the facet-shaped projection 15' and is therefore likewise triangular. As can be seen from FIGS. 7 and 8, the member 14
The facet-shaped projection 15 'that is punched from has a hole 26 in the center, and this hole 26 facilitates the punching process, and
Reduces heat dissipation during the welding process. As in the facet projections 15 according to FIGS. 2 to 5, the facet projections 15 ′ with the conical peripheral surface 16 for the cone collars 27 are
At the base of the collar 27 projecting from 4, the receiving pocket 2
It has an annular recess 28 which serves as 4. FIG. 7 shows the initial state of the welding process of the members 10 and 14, the figure shows the joined state after the welding process, the material volume extruded by the welding process being in the receiving pocket 24.

In order to obtain the combined state shown in FIG.
First, 0, 14, 19, and 21 are in the positions shown in FIG. 2, and are held in this position by a spring pressing device (not shown). When the predetermined pressing force is reached, the capacitor discharge occurs due to the welding process. At that time, a molten state occurs in the contact area due to the high electric current strength and the large electric resistance at the contact point.
Are pressed against each other, and at the same time the facets 15
And the notch 12 are welded. There is no distortion of these parts after the welding process, as compared to other welding methods, there is only a slight increase in the temperature of the parts that are joined to each other due to the short and practical impact heating in the welding area. .

As already mentioned, the illustrated and described embodiments merely exemplify the invention and the invention is not limited thereto. Rather, various modifications and alternative configurations are possible. Furthermore, the novel features mentioned in the description of the invention and shown in the drawings are important to the invention even if they are not explicitly claimed in the claims.

[Brief description of drawings]

FIG. 1 is a side view of a side wall of a joint fitting having a holding arc piece for fixing a joint portion in an axial direction and fixed to a lower portion of a seat.

2 is a cross-sectional view of the joint metal fitting taken along the line II-II of FIG. 1, in which the members to be joined are in the position immediately before the start of the welding process.

3 is a view of members joined together after the welding process, as viewed in the direction of arrow III in FIG. 1;

FIG. 4 is a cross-sectional view in the area of the facets of two members to be joined together in a straight line in the welding process, the member having a notch receiving the facets starting from the receiving notch for the facets. It has an annular recess that extends in the radial direction.

FIG. 5 is a cross-sectional view similar to FIG. 4, showing the receiving pocket as an annular recess slightly radially apart from the notch for the notch projection.

FIG. 6 is a front view of a member that is configured as a joint portion and has a facet-like protrusion as seen from the facet-like protrusion side.

7 is a cross-sectional view of the lower joining range of the two members according to FIG. 6 in a welding process starting state.

8 is a sectional view of the member according to FIG. 7 after the welding process.

[Explanation of symbols]

10, 14, 19, 21 members 12 notches 15 facets

Continuation of the front page (72) Inventor Heinz Huos, Federal Republic of Germany Leverkusen Karl-Maria-Huon-Vuebel-Syutrase 47 (56) Reference JP-A-63-259213 (JP, A) −80275 (JP, U) (58) Fields surveyed (Int.Cl. ⁷ , DB name) A47C 1/025 B23K 11/14 B60N 2/22

Claims (6)

(57) [Claims] 1. Manufacture of a member connection in a seat adjusting device.
In the method, a cut protruding toward the connecting side of one of the members (14, 19).
The childlike projection (15) has the shape of the other member (10, 21)
And a notch (12) of approximately the same size,
This is pressed against the other member (10, 21) and then carried out on both members (10, 14, 21).
The capacitor discharge has facets (15) and notches (1).
The contact area with 2) is made into a molten state, and during this melting stage both parts (10, 14, 21)
The final contact due to the pressing force exerted on these members
A method for manufacturing a member connecting part, which is characterized in that: 2. One of the members (14, 19) is on the connecting side.
With multiple facets (15) protruding into
The facet-shaped projections of the other shape and the shape of the other member (10, 21)
To the notch (12) where
The indentation according to claim 1, wherein the indentation is performed during the welding process.
How to list. 3. The facets (15) before the welding process.
However, starting from the base section (17), this base section (1
7) It has a conical peripheral surface (16) that tapers to a smaller end surface (18), and the notch (12) has a facet-shaped projection (1).
5) for receiving the end face of the faceted shaped projections (15) (1
Method according to claim 1 or 2 , characterized in that it has a cross-section slightly larger than 8) and the cross-section of this notch (12) is smaller than the base cross-section (17) of the facets (15). 4. One member (14, 1) before the welding process.
9) facets (15) and the other member (10, 2)
Method according to claim 3 , characterized in that the cutout (12) of 1) has a circular circumference. 5. One member (14, 1) before the welding process.
9) facets (15) and the other member (10, 2)
Method according to claim 3 , characterized in that the notch (12 ) of 1 ) has a polygonal perimeter. 6. One member (14, 1) before the welding process.
9) has a plurality of facets (15) spaced apart, the same number of notches (12) being provided at positions where the other member (10, 21) matches these facets. 4. The method according to claim 3 , characterized in that