JPS6223170B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an assembly of two concentric members fitted together, one of the members being centrally cylindrical and the other member being a disc material with central teeth. The tooth has a hardness higher than that of the central member, and when the tooth is fitted into the central member, it forms a ridge in the member, and when the fitting is completed, the tooth is embedded in the ridge. The two members are then angularly integrated with each other, and the disk is axially secured to the central member by two opposing thrust stops.

In known devices of this type applied to friction discs of clutches, which have a wheel core forming the central part and a disc connected by means of a torsion damping spring to a plate with a friction lining, the central part is When forming ridges and grooves, the teeth of the disc scrape away chips.
At the end of the mating stroke, the chips are sheared by a chip-receiving groove in the central member, and the collar of the central member, adjacent to said groove, is sheared by the axial thrust stop of the disc. Define one of the following.

This arrangement is generally satisfactory and is widely used in clutch friction discs, providing excellent robustness.
Manufacturing costs are also low. However, this cost also applies to the central wheel center.
A deduction is made for the need to form a stop collar on the disc with a chip-receiving groove.

The subject of the present invention is an assembly of two mated concentric members, the construction of which is less complicated than that of the known devices mentioned above.

According to the invention, the assembly is characterized by two axial thrusts of the disc, which are formed by multiple protrusions of the central member, which are formed by the creep of material seen during the ridges that the disc itself applies to the central member. One of the stops is constructed and the projection is rigidly integrated with the central member.

If the above method is used, there will no longer be any chip formation during ridge raising, but there will be material creep. Before assembly, the cylindrical surface of the central member is long enough, the material is continuous, and there are no irregularities, resulting in an excellent connection between the protrusion and the central member, and the protrusion can freely protrude in all directions. make it possible to This further saves material and considerably simplifies the construction of the central part, the outer surface of which, before assembly with the disc, is a smooth cylindrical surface separated only by a slight shoulder. It has the effect of

When forming the ridges in the central part, one possibility would probably be to use a special tool for this task and to change the tool to a disc after each operation, but this would make the installation complicated and inaccurate. , are less suitable than those of the present invention for transmitting large torques such as those appearing on the friction disc of the clutch.

Another feature of the invention is that the ridge-raising edge of the central hole of the disk is rounded to provide superior creep of the material released during ridge-setting, so that it is fully formed and attached to the central member. It has come to form a firmly attached protrusion.

Good results are obtained when the radius of the rounded edge of the attacking edge is approximately equal to the height of the teeth of the central hole of the disc. The above-mentioned hole may be straight or flared, but preferably it is a cone with an apex angle of several degrees, at most 10 degrees. This flare preferably extends from the receiving edge to the other edge in the hole of the disk.

The above-described geometry of the hole in the disk gives an overall superior result and is also inexpensive to produce, for example if the same hole is made by a stamping operation with a punching tool. , immediate roundness and fraying are obtained.

Another feature is that each projection has a substantially equilateral triangular shape within the diametrical cross-section of the central member, the area where the projection connects with the central member forms one side of the triangle, and the other slightly concave side is a disc. It forms a thrust stop seat connected to the rounded edge of the hole, and the third side visible from the outside is convex. Preferably, the shape of each protrusion is approximately a quarter of an ellipsoid.

As is understood, good results are obtained by
This is the case when the angularly integrated ridges and the corresponding axial thrust stops are small in size and in large number, about several dozen.

The invention is also directed to a friction disc of a clutch having the above assembly, wherein the central member constitutes the center of the disc and the other member comprises a friction lining visible by means of a torsion damping spring. It constitutes a circular disk connected to the .

Yet another object of the invention is a method of assembling two mating concentric members, one member being cylindrical and the other member having a toothed center member with harder teeth than the central member. The disc is in the form of a disc with a hole, the teeth forming a ridge when mated with the central member and recessed therein when mating is completed to angularly integrate the two parts together; to the central member by two opposing thrust stops;
It is fixed immovably in the axial direction.

This method is characterized by having at least two cylindrical bearing surfaces of different diameters separated by a small shoulder before mating, with the cylindrical bearing surface of the larger diameter being sufficiently
In the case of a central member that is smooth and continuous, allowing the material to flow without cutting to form a protrusion that is integrally connected to the central member, the disc is attached to the central member and the protrusion is connected to the central member. The method is to use a press with a space that allows the material to be formed freely without fear of crushing.

More particularly, in this method the central member is placed with its largest diameter bearing surface within a hole in the abutment plate of the press, the hole defining said space at the surface of the abutment plate. A notch is provided so that the shoulder of the central member extends above the surface of the abutment plate. When the disk is placed on this shoulder and an annular tool is placed on top of the disk, and the tool and the plate are brought close together, the angularly integrated ridge groove and the corresponding protrusion of the axial thrust stop are revealed. formed,
The protrusion is formed freely within the space defined by the cut.

This method of the invention is applied to the assembly of the two concentric members forming the above-mentioned assembly of the invention, and in particular to the assembly of the friction discs of the clutch.

The thrust stop opposite the thrust stop constituted by a projection is preferably constructed by a snap-in projection.

The central member has a third member with a smaller diameter than the other two.
The member preferably has three cylindrical support surfaces of successively larger diameters. This third bearing surface serves to align the central part with respect to the tooling of the press.

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

The illustrated embodiment is, for example, an application of the invention to a friction disc of a clutch, generally designated 10 in FIG.

The disc 10 has a cylindrical ring core 11 assembled with a disc 12 according to the invention. The disk 12 is a twisted damping spring.
torsion) 13 to a plate 14 carrying a friction lining 15.

The ring core 11 is semi-hard steel with a Rockwell hardness class C and is treated to have a hardness of 18 to 31 under 150 kg, and the disc 12 is a Rockwell hardness class C 20.
It is a mild steel that has been cyanidated to have a hardness of 45 kg or more, ie, a hardness higher than that of the wheel core 11.

The assembly of the wheel core 11 and disk 12 is shown in detail in both the second and third figures. In this assembly, the wheel center 11 is fitted into the disk 12 to form a ridge groove 16 on the wheel center, and when the fitting is completed, the disk 12 remains buried in the ridge groove, and the disk 12 and Both members of the wheel center 11 are angularly integrated with each other, and a small protrusion 17 formed on the wheel center 11 by plastic deformation of the material of the ridges and grooves constitutes an axial thrust stop on the disk side with respect to the disk 12, On the other hand, the continuous annular projection 18 of the wheel core 11 constitutes another axial stop on the other side with respect to the disc 12.

Before assembly with the disc 12, the wheel core 11 (FIG. 4) has three successive cylindrical support surfaces 19, 20 and 21 of increasing diameter. The cylindrical support surface 20 of intermediate diameter has a length that extends to the other support surfaces 19,2.
shorter than the length of 1. In particular, the supporting surface 21 extends sufficiently to the left in FIG. 4 to form a continuous, perfectly smooth cylinder, without any irregularities, and without the risk of cutting or crushing the protrusion 17. The cylindrical support surface 20 is separated from the support surface 19 by a small shoulder 22.
They are also separated from the support surfaces 21 by small shoulders 23, respectively.

The disk 12 (both 5th and 6th figures) is the ring center 11
It consists of a flat plate, the thickness of which is approximately equal to the length of the small intermediate bearing surface 20 of the wheel core 11, which has a toothed central hole 24, the toothed 2
As is clear from the above description, wheel core 5 is harder than wheel core 11.

As can be seen in more detail in Figures 11 and 12 and in Figure 20, the teeth 25 have a generally flower-like shape without sharp edges. Toothed hole 24
The leading edge 26 of the disk 12 is rounded with a radius R that is approximately equal to the height H of the tooth 25, and the taper of the hole, for example, several degrees, at most 10 degrees, is
A flare is formed from the rounded leading edge 26 to the rear surface 27. The reason why the radius R of the attacking edge 26 is made approximately equal to the height H of the tooth 25 (which is approximately equal to the height of the shoulder portion 23) is that the attacking edge 26 is brought into contact with the shoulder portion 23 at a preferable angle; This is to smooth the flow of the material due to plastic deformation when forming the protrusion 17. Furthermore, the reason why the toothed hole 24 of the disk 12 is tapered to a maximum of about 10 degrees to form a flare is that when the disk 12 is press-fitted to the ring center 11, the plastically deformed material is inserted into the toothed hole 24. This is to allow smooth flow without clogging, and the reason why it is limited to a maximum of 10° is because disk 1
2 and the fitting protrusion 18, so that the contact area between the fitting protrusion 18 and the disk 1
This is to prevent the retention ability of No. 2 from decreasing.

To fit the disc 12 onto the wheel center 11, insert the wheel center 1.
1 into the hole 28 of the pressing plate 29 of the press 30 (Fig. 7)
Place it inside. The diameter of the hole 28 is approximately equal to the diameter of the cylindrical support surface 21 of the wheel core 11, with a slight play. End surface 3 adjacent to the support surface 21 of the wheel core 11
1 abuts the bottom 32 of the hole 28. The upper surface 33 of the abutment plate 29 is spaced a distance D from the shoulder 23 of the wheel center 11 at the positions shown in FIGS. 7 and 11 (7th
or FIG. 11), the distance D corresponds to the distance that the disc 12 is inserted into the wheel center 11. This stroke is approximately equal to the thickness of the disk 12.

Specifically, the length of the distance D mentioned above is approximately equal to the length of the intermediate cylindrical support surface 20.

As can be seen in both Figures 7 and 11, the pressing plate 29
The notch 34 which the hole 28 has in the upper surface 33 defines an annular groove-shaped space around the wheel center 11 when the wheel center 11 is placed in the hole 28.

When the disc is placed on the shoulder 23 by its rounded landing edge 26, the engaging diameter of the toothed hole 24, as seen in FIG. approximately corresponds to the diameter of

Tool 35 of press 30 (both figures 7 and 8)
is a ring, the diameter of whose bore 36 is approximately the same as the diameter of the bearing surface 19 of the ring center, with a very slight play, and whose bore 36 is such that the tool 35 can
7 is adapted to engage the support surface 19 when it abuts against the disk 12, and the disk itself abuts against the shoulder 23. A relief groove 38 in the end face 37 of the bore 36 is provided to prevent the tool 35 from touching the shoulder 22.

Another tool 35a (FIGS. 9 and 10) of the press 30 is also a ring, and its bore 36 is connected to the tool 3.
The end face 39 of 5a has two successive relief grooves 40 and 41, which provide a flat annular working area surface for fitting.
travail) 42 such that, upon insertion, the area surface 42 abuts a portion of the shoulder 22 (FIGS. 9 and 17). The clearance groove 41 allows the inset projection 18 to be conveniently formed (FIGS. 10 and 18).

The operation of assembling the wheel center 11 and the disk 12 using the press 30 is performed in two stages. The first step is fitting, which is carried out by placing the end face 37 of the tool 35 on the disk 12 (FIGS. 7 and 8). The second step is fitting, in which the end face of the tool 35a is inserted into the disk 12.
(Figures 9 and 10).

For the purpose of mating, but before it begins, disk 1
2 has a shoulder portion 23 by its rounded facing edge 26.
The end surface 37 of the tool 35 of the press 30 is in contact with
As shown in FIG. 11, the shoulder portion 22 is brought into contact with the rear surface 27 of the disk 12 with a relief groove 38 widely surrounding it.

In this state, when the tool 35 is pressed by the press 30 toward the pressing plate 29, the rounded teeth 25 form ridges 16 in the support surface 21 and remove the material that can be extracted within these ridges 16. It is plastically deformed again to form a small protrusion 17 on the wheel core 11. It should be noted that the support surface 21 is completely smooth and continuous over a sufficient distance, i.e. without any irregularities, so that the formation of the protrusion 17 is not hindered in any way by crushing or cutting effects. Yes, and also,
It is also noted that the notch 34 allows the projection 17 to be accommodated freely without any risk of crushing.

The protrusions 17 seen in the fourteenth, fifteenth and sixteenth figures are fully formed after fitting, that is, when the disk 12 has reached the upper surface 33 of the backing plate 29.

As can be seen, in the diametric cross-section as shown in FIG. It has an etendu-e d'enracinment 17a and a rounded fillet 17b when viewed from the side of the disk 12, which is formed on the spot so that the toothed hole 24 is not rounded. It closely engages the edge 26 and acts as a bearing surface, which is particularly effective in ensuring the axial thrust stop of the disc 12 relative to the wheel center 11. The projection 17 has a generally convex surface 17c in the shape of a quarter of an ellipsoid, and the shape of the trace on the disk 12 on the same surface is shown in FIG.
7d, and the shape of the mark on the cylindrical surface 21 of the ring center 11 is shown in FIG. 16 as 17e. Each projection 17 has an approximately equilateral triangular shape in the diametrical cross-section of the central member or ring center 11 , the connection area between the projection 17 and the central member forming one of its sides, and the other side at the center of the disc 12 . The reason why the third side, which engages with the receiving edge 26 of the hole to form a thrust stopper seat and whose appearance is visible, is convex is that it provides the best supporting effect for the disk 12 by the protrusion 17, and the protrusion 17
This is to maximize its strength. Further, the reason why the surface 17C of each protrusion 17 is shaped approximately like a quarter of an ellipsoid is to maintain the strength of the protrusion 17 itself to the maximum and increase the supporting strength of the disk 12.

As seen, the central toothed hole 2 of the disk 12
The number of teeth 25 of No. 4 is large for a diameter of about 37 mm of the cylindrical support surface 21, and there are, for example, 35 to 40 teeth.
The dimensions of these teeth are small, for example about a quarter of the diameter of the hole 24. As can be seen in both Figures 15 and 16, the protrusions 17 are close to each other but do not join;
are separated by a distance E, which is about half the length T of the mark left at the intersection of the disk 12 and the wheel core 11. The reason why the dimensions of the ridge grooves 16 and the corresponding protrusions 17 of the axial thrust stops are made small and a large number of tens of digits are provided is so that the disk 12 can be press-fitted with a relatively small pressing force. At the same time,
By reducing the size of the individual ridges 16 and projections 17, the material is plastically deformed uniformly and precisely, so that there is no play between the axis 11 and the disc 12 that would cause a relative angular displacement. This is for the purpose of

The second stage, ie the setting, is carried out with a tool 35a whose area surface 42 rests against the shoulder 22. FIG. 17 shows the mounting state before pressing. When pressed, the area surface 42 repousses a portion of the shoulder 22.
The fitting projection 18 is inserted into the relief groove 41 and serves as an axial thrust stop for the disk 12. In figures 18 and 19,
The shape of the fitting projection 18 is shown to be annular and continuous.

The assembly of the wheel center and disc constructed according to the present invention is extremely robust and well integrated both angularly and in both the front and rear axial directions, and the cost of the assembly is minimal. .

[Brief explanation of the drawing]

FIG. 1 is a partial view in diametrical section of a clutch friction disk having a wheel center and a disk assembled in accordance with the present invention. FIG. 2 is a side elevational view in the direction of the arrow - in FIG. 3, with a portion removed and enlarged, of the assembly formed by the wheel core and disk. FIG. 3 is a half front elevational view of the assembly looking in the direction of the arrow - in FIG. 2; Fourth
The figure is a diametrical cross-sectional view of only the wheel core before assembly. FIG. 5 is a partial side elevational view taken along the line - of FIG. 6 of the disk only, before assembly; FIG. 6 is a partial front elevational view of the disk alone, before assembly, as seen in the direction of the arrow - in FIG. Figures 7, 8, 9 and 10 show the stages of assembling the wheel core and disk in a press.
FIG. 11 is an enlarged partial view taken diametrically along line XI--XI in FIG. 12, showing the state before the fitting of the disk to the wheel core begins on the press. FIG. 12 is a view corresponding to the front view of the disk and wheel center, and is a view seen in the direction of arrows XII--XII in FIG. 11. FIG. 13 is similar to FIG. 11, but shows the disk being fitted into the wheel core.
FIG. 14 is similar to FIGS. 11 to 13, but shows the disk after it has been fitted into the wheel core. FIG. 15 is a partial cross-sectional view of the wheel core and disk taken along the line - in FIG. 14. 1st
FIG. 6 is a diagram corresponding to the above diagram, and is a diagram seen in the direction of the arrow - in FIG. 15. FIG. 17 is similar to FIGS. 11, 13, and 14, but shows a state in which the ring core has not yet been fitted into the disk using a press. Figure 18 is the 17th
Similar to the figure, but showing the finished mating. FIG. 19 is a partial view of the wheel center and the disk viewed from the fitting side in the direction of the arrow - in FIG. 18.
FIG. 20 is a view similar to FIG. 11, but enlarged to clearly show the rounded attack edge of the disk and the flare angle of the central hole of the disk. Reference number guide, 10... Friction disk, 11... Ring center, 12... Disc, 13... Twisted damping spring,
14... Plate, 15... Friction lining on the plate, 16... Ridge, 17... Protrusion, 17a... Base area of protrusion 17, 17b... Fillet of protrusion 17, 17c... Protrusion 17 convex surface, 17d...shape of protrusion 17 on disk, 17e...shape of protrusion 17 on ring center, 18...annular fitting protrusion, 19...
... Cylindrical support surface, 20 ... Cylindrical support surface, 21 ... Same as above, 22 ... Shoulder part, 23 ... Same as above, 24 ... Center hole, 25 ... Same as above tooth, 26 ... Coming edge, 27 ...
...Rear side, 28...hole, 29...pattern, 30...
Press, 31... End face, 32... Bottom of hole, 33...
...Top surface of the applying plate 29, 34...notch, 35...
...Annular tool, 35a...Same as above, 36...Same bore, 37...Same upper end surface, 38...Escape groove, 39...
...End face, 40, 41... Relief groove.

Claims (1)

[Scope of Claims] 1. One member is a cylindrical central member and the other member is a disk having a toothed central hole having teeth harder than the central member, the teeth fitting into the central member. Both members are angularly integrated with each other by creating a ridge and filling it at the end of the fit, and the disc is axially fixed onto the central member by two opposed stops. , in an assembly of two fitted concentric members, one of the two axial stops of the disc is formed by the plastic deformation of the material that appears when the central member is ridged by the disc itself. 1. An assembly comprising a plurality of protrusions, the protrusions being integrated with a central member, and a facing edge for ridges of the central hole of the disk being rounded. 2. An assembly according to claim 1, characterized in that the rounded attacking edge of the central hole of the disk has a radius approximately equal to the height of the teeth of the hole. 3. In the assembly according to claim 1, the apex angle of the flare of the toothed hole of the disk is at most 10
An assembly characterized by having a conical angle of °. 4. An assembly according to claim 1, in which each projection has a substantially equilateral triangular shape in a diametrical section of the central member, the connecting area of the projection and the central member forming one of its sides. , the other side engages with the receiving edge of the hole in the disk to form a thrust stopper seat, and the third, visible side is convex. 5. An assembly as claimed in claim 1, characterized in that each projection has approximately the shape of a quarter of an ellipsoid. 6. The assembly according to claim 1, characterized in that the angularly integrated ridges and the corresponding axial thrust stop protrusions are small in size and numerous, about several dozen. assembly.