JP2983604B2 - Connection structure of rotation transmission member for automatic transmission - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coupling structure of a rotation transmission member used in an automatic transmission, and more particularly to a method for fixing a thin-walled press or forged member to another member. For a suitable coupling structure.

[Conventional technology]

In automatic transmissions for vehicles, weight reduction, miniaturization, and multi-stage are required due to the demand for mounting on vehicles and improving vehicle running fuel efficiency and ride comfort, and accordingly, the components of the automatic transmission are also required. The thickness is reduced as much as possible in order to increase the axial dimension, and most of them are constituted by pressed or forged plate materials.

Conventionally, when such pressed parts and forged parts are combined with each other to form a combined part, ninth to eleventh parts are required at the time of subassembly.
A welded connection structure as shown in the figure is used. In this example, a drum A of a clutch whose inner surface is machined after press forming and a hub B of a clutch whose spline portion is machined after forging are formed on the end surface of the drum A by projection forming at the time of press forming. A welding connection structure is adopted in which the drum A and the hub B are integrally joined by melting and joining the up to eight projections C as spots for energization.

[Problems to be solved by the invention]

However, in the above-described connection structure, it is difficult to secure sufficient strength against thermal deformation as the members become thinner, so that the drum A and the hub B are viewed in the axial direction due to heat generated during welding. In this case, a petal-shaped waveform corresponding to the interval between the welding points S is deformed. Such deformations are
It occurs in the area shown by the hatched area in FIG.
In the above, the cylindricity, roundness, spline interval, etc. of the piston sliding surface A1 and the clutch plate fitting spline portion A2 formed on the inner periphery of the cylindrical portion are deteriorated, and the outer periphery of the hub B is also machined by machining. Not only does the cylindricity, roundness, spline spacing, etc. of the formed clutch plate fitting spline portion B1 deteriorate, and the individual precision of these members, each of which has a high processing accuracy as a single piece, is impaired at the time of subassembly, It also deteriorates the relative accuracy as an assembled part.

In view of such circumstances, the present invention provides a coupling structure capable of securely fixing members to each other by simple processing without impairing the processing accuracy of each rotation transmission member for an automatic transmission. Aim.

[Means for solving the problem]

In order to solve the above-mentioned problems, the present invention relates to a coupling structure of a rotation transmission member for an automatic transmission in which flange portions extending in a radial direction of a pair of members are brought into contact with each other and coupled to each other, The portion has a projection formed by plastic deformation on the contact surface side corresponding to the concave portion by forming a concave portion by a pushing force applied to a predetermined range of the non-contact surface of the flange portion. The flange portion of the other member has a hole formed corresponding to the projection forming position of the flange portion of the one member, and the projection of the one member is fitted with the hole of the other member. The heads of the projections protruding from the holes in the abutting state of the two flange portions are crushed to expand the diameter, thereby caulking and connecting the two flange portions.

In the above configuration, it is effective that the protrusion is formed at an interval on a contact surface of the flange portion of the one member.

Further, in the above configuration, it is effective that the protrusion has a columnar shape, and the concave portion for protruding and forming the protrusion has a larger diameter than the columnar protrusion.

[Action and effect of the invention]

The coupling structure of the rotation transmitting member according to the present invention having such a configuration employs a configuration in which the two members are coupled by caulking a protrusion formed integrally with one member.
While maintaining the same strength as conventional welded joints without increasing the number of parts for joining, members that are made of a material that cannot be joined by welding or a coating material that prevents welding are joined by members due to thermal distortion. This can be achieved by simple processing without causing deformation of. In addition, the projection for coupling is formed by a plastic deformation on the contact surface side corresponding to the concave portion because the concave portion is formed by a pushing force applied to a predetermined range of the non-contact surface of the flange portion. Therefore, it can be sufficiently formed by a small press machine having a small generating ability.

In particular, in the configuration of the second aspect, the coupling structure of the present invention can be applied to a conventional spot welding coupling portion without any change in the shape of the rotation transmitting member.

Furthermore, in the configuration according to the third aspect, a long projection can be formed with respect to the amount of pressing with a small amount of local pressing, so that the processing can be performed with a small press machine having a small generating capacity, and a sufficient height can be obtained. Projections can be formed.

〔Example〕

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a sectional view showing a coupling structure according to an embodiment of the present invention;
FIG. 2 is an enlarged sectional view of a portion II in FIG.

As shown in FIG. 1, in this example, a drum 1 of a forward clutch and a hub 2 of a direct clutch, which constitute a rotation transmitting member of an automatic transmission, are connected to a radial flange portion thereof.
11 and 21 are brought into contact with each other, and a cylindrical protrusion 12 formed on the radial flange portion 11 of the drum 1 by extrusion at an equidistant circumferential position around the rotation axis of the drum. Fitted in a hole 22 formed in the flange portion 21 of the hub 2, the head 12 a of the projection 12 is caulked and deformed so as to sandwich the contact surface 21 a and the non-contact surface 21 b of the flange portion 21 of the hub 2. Fixed.

FIGS. 3 (a) to 3 (d) are process drawings showing, in cross-section, the processing and joining process of the joining portion in the joining structure.

Third, as shown in Figure (a), in the appropriate step of the press working of the drum member, the punch P1 having a large diameter d ₂ than the diameter d ₁ of the holes D1 die D provided in the die D work after the processing of W1 were bite from the side serving as the non-contact surface of the flange portion, the amount of bite ^{_{π (d 2/2) 2}} 1 volume fraction [pi (d _1/2) corresponding to ₂ ² 1 ₁ just workpiece W1 A part thereof is made to protrude into the hole D1 by plastic deformation, and a columnar projection 12 is formed on the side to be the contact surface after processing. Thereby, the protrusion 12 formed on the contact surface side can be made smaller in diameter and longer than the depth and outer diameter of the concave portion formed on the non-contact surface side due to the penetration of the punch P1. Such press working can be sufficiently performed by a small press machine having a small generating ability.

On the other hand, as shown in FIG.
In an appropriate step of the press working, a hole 22 is formed in the flange constituting portion of W2 by punching a punch P2 corresponding to the position where the projection 12 is formed. This hole 22 has a diameter d _{1 of the} protrusion 12.
Interference by a diameter d ₃ that fit, can be configured to serve also as positioning means for preventing the positional deviation at the time of coupling of the two members.

Next, as shown in FIG. 3 (c), the projections 12 formed as described above are press-fitted into the holes 22 at the time of sub-assembly of the drum 1 and the hub 2 which have been processed. And finally, a punch P sharp at the tip of the head 12a of the projection 12
The head of the protrusion 12 is pushed and spread laterally by making the tip of 3 dig into the end, thereby completing the caulking. The completed state of such caulking is shown in FIG.

In the above embodiment, a simple columnar projection is formed by a single processing. However, when it is necessary to increase the height of the projection corresponding to the thickness of the hub, or when the outer periphery of the projection is formed. When changing the shape of the projection, such as when using a part of the surface for positioning, processing is performed several times using dies and punches with different diameters to form a bamboo-shaped projection with stacked cylinders with different diameters It is possible to make the inside of the projection hollow by making a punch smaller in diameter than the hole diameter of the die in a part of the processing process, or to keep the same hole diameter on the die side sequentially A plurality of times of processing in which the diameter of the indentation punch is changed may be performed.

In this manner, according to the coupling structure of the above embodiment, the coupling between the members is completed without thermal deformation, so that the subassembly can be completed without impairing the processing accuracy of the single member. Therefore, as shown in FIG.
In the case of this example, the cylindricity, roundness, and spline interval of the inner diameter portion forming the piston sliding portion 13 of the drum 1 and the spline portion 14 forming the sliding guide portion of the clutch plate can be kept good. become. Also on the hub 2 side, the cylindricity, roundness, and spline interval of the outer peripheral spline 23 can be favorably maintained. Further, since the electrodes are not consumed as in the case of projection welding, the time and cost required for replacing consumables can be reduced.

By the way, the rotation transmitting member is used in each part of the automatic transmission, and therefore, the coupling structure of the present invention can be applied to various parts. Hereinafter, some application examples will be described.

FIG. 4 shows an example in which the present invention is applied to a coupling between a drum 1a of a forward clutch and a hub 2a of a direct clutch of an automatic transmission mounted on a front engine front drive vehicle (hereinafter referred to as "FF vehicle").

FIG. 5 shows the connection between the drum 1b of the direct clutch and the hub 2b of the forward clutch of another type of automatic transmission also mounted on the FF vehicle, and the connection between the underdrive carrier 3c and the hub 2c of the underdrive clutch. This shows an example in which the present invention is applied to the connection between the inner 4 of the connection and lock-up clutch and the hub 5 of the torque converter turbine.

Next, FIG. 6 shows the connection between the hub 6 of the second brake and the thrust collar 7 and the connection of the hub 2d of the underdrive clutch and the underdrive carrier 3d of another type of automatic transmission also mounted on the FF vehicle. It shows an example of application.

FIG. 7 shows a direct clutch drum 1g of an automatic transmission mounted on a front engine rear drive vehicle.
FIG. 6 shows an example in which the present invention is applied to the connection between a clutch and a forward clutch hub 2g.

Finally, FIG. 8 shows the connection between the drum 1h of the direct clutch and the hub 2h of the forward clutch, the servo cylinder inner cylinder 8 for the second brake, and the piston of the third brake of another automatic transmission of a slightly different type from the above. This shows an example in which the present invention is applied to the connection of the second brake that also serves as the outer cylinder 9.

In this manner, the coupling structure of the present invention can be widely applied to coupling of various rotation transmitting members provided in each part of the automatic transmission.

As described above, the present invention has been described in detail based on the embodiments. However, the present invention is not limited to only the disclosed contents of the above-described embodiments, and a specific configuration according to the implementation state within the scope of the claims. It is needless to say that this does not prevent the change.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a coupling structure according to an embodiment of the present invention, FIG. 2 is an enlarged sectional view of a part II in FIG. 1, and FIG. 4 to 8 are cross-sectional views of an automatic transmission showing an application example of the coupling structure, FIG. 9 is a cross-sectional view showing a conventional welding coupling structure, FIG. 10 is a perspective view thereof, and FIG. Sectional view showing the shape before joining
FIG. 12 is a cross-sectional view showing thermal deformation due to the connection. 1 ... drum (one member), 2 ... hub (the other member), 11 ... flange portion, 12 ... protrusion, 12a ... head, 2
1 ... Flange, 21a ... Contact surface, 21b ... Non-contact surface, 2
2 ... hole

Claims (3)

(57) [Claims] 1. A coupling structure for a rotation transmitting member for an automatic transmission in which flange portions extending in a radial direction of a pair of members are brought into contact with each other and coupled to each other, wherein the flange portion of one member is The concave portion is formed by a pressing force applied to a predetermined range of the non-contact surface, and has a protrusion formed by plastic deformation on the contact surface side corresponding to the concave portion, and the flange of the other member The part has a hole formed corresponding to the projection forming position of the flange part of the one member. The protrusion of the one member is fitted to the hole of the other member, and the contact part of the two flange parts is formed. A coupling structure for a rotation transmission member for an automatic transmission, wherein the flanges protrude from the hole in a contact state are crushed to expand the diameter so that the flange portions are caulked and coupled. 2. The structure according to claim 1, wherein the protrusions are formed at intervals on a contact surface of the flange portion of the one member. 3. The automatic transmission according to claim 1, wherein the projection has a cylindrical shape, and the concave portion for forming the projection has a diameter larger than that of the cylindrical projection. Connection structure of rotation transmitting member.