JP6648746B2 - Electric resistance press-fit connection structure - Google Patents

Description

The present invention belongs to the technical field related to the electric resistance pressed junction structure.

  Conventionally, when joining a first member and a second member, in order to obtain a large joining strength, the second member is press-fitted into a hole of the first member, and electricity is supplied between these two members. It is known that a first member and a second member are joined by electric resistance (for example, see Patent Document 1).

  In the electric resistance press-fitting joint structure thus joined, there is a high possibility that burrs in the first member and the second member, which are press-fitted to each other and extend from the electric resistance joined joint, are generated. Therefore, in Patent Document 1, a burr accommodating space for accommodating the burr is formed by notching or denting a part of the first member or the second member.

JP 2005-014064 A

  In an automatic transmission mounted on a vehicle such as an automobile, a clutch device is used to switch a plurality of power transmission paths formed by a plurality of planetary gear sets from an input unit to an output unit. This clutch device has a clutch drum to which a friction plate is attached, and this clutch drum is connected to, for example, a certain rotating element of a certain planetary gear set. Such a clutch drum is usually formed by press-forming a plate material.

  Here, if the position of the friction plate is far from the position of the rotary element to which the clutch drum is connected due to the configuration and space of the automatic transmission, the clutch drum may become longer in the axial direction. In this case, in order to facilitate the manufacture of the clutch drum, the clutch drum includes a first cylindrical member that forms a part of the axial direction and a second cylindrical member that forms another part of the axial direction. It is conceivable to configure with. Then, the first tubular member and the second tubular member are each formed of a plate material, and the two tubular members are joined to each other. Further, if the first tubular member and the second tubular member are made of different materials, there is a possibility that the weight of the clutch drum can be reduced.

  When the clutch drum is composed of the first tubular member and the second tubular member as described above, the outer peripheral surface of the first tubular member and the inner peripheral surface of the second tubular member are press-fitted to each other and are electrically connected. It is possible to do. Then, as described in Patent Document 1, a part of the first tubular member or the second tubular member is cut or dented to form a burr accommodation space, and burr is formed in the burr accommodation space. Be contained.

  However, there is a possibility that the burr accommodating space portion as described in Patent Document 1 cannot be formed only by press molding, and for example, cutting may be required. In addition, there is a case where a part of the burr accommodating space portion of Patent Document 1 is opened, and in this case, if the burr is peeled off, the burr may come out of the burr accommodating space portion. The burrs protruding outside the burrs accommodating space may be caught between gears meshing with each other in the planetary gear set, or may be blocked in an oil passage through which lubricating oil flows.

  The present invention has been made in view of such a point, and an object of the present invention is to provide an outer peripheral surface of a first tubular member formed of a plate and an inner peripheral surface of a second tubular member formed of a plate. When press-fitting the peripheral surfaces with each other and performing electric resistance bonding, it is possible to easily form the burr receiving space portion and to suppress the burr in the burr receiving space portion from outside the burr receiving space portion. is there.

In order to achieve the above object, according to the present invention, a first cylindrical member formed of a plate material is disposed coaxially with the first cylindrical member on one side in the axial direction of the first cylindrical member. And a second cylindrical member formed of a plate material, and a joining portion that is press-fitted and electrically joined to the outer peripheral surface of the first cylindrical member and the inner peripheral surface of the second cylindrical member with each other. The first cylindrical member and the second cylindrical member include an outer peripheral surface of the first cylindrical member and the second cylindrical member for an electric resistance press-fitting joint structure provided over the entire circumference in the direction. inner both sides of the tube axis direction with respect to the junction between the peripheral surface, burr accommodating space for accommodating the burr extending from the joint portion of the first tubular member and second tubular member parts so as to surround substantially the entirety of the formed and the burr accommodating space portion is bent, the first tubular member, the bonding An axially extending portion which is provided adjacent to the second cylindrical member in the cylinder axis direction on the opposite side and has an outer diameter substantially equal to the joint portion and extends in the cylinder axis direction; A radially extending portion extending radially outward from an end of the directionally extending portion on the side opposite to the joining portion, and a radially extending portion provided adjacent to the joining portion on the second cylindrical member side in the cylinder axis direction; An outer diameter having a smaller diameter portion having a smaller diameter than the joint portion, wherein the second cylindrical member is provided adjacent to the joint portion on the first cylindrical member side in the cylinder axis direction; A large-diameter portion having an inner diameter larger than the joining portion, provided adjacent to the joining portion on a side opposite to the first cylindrical member in the cylindrical axis direction, and having an inner diameter substantially equal to the joining portion; An axially extending portion extending in the cylindrical axis direction with a diameter; and a radially extending portion extending radially inward from an end of the axially extending portion on the side opposite to the joint portion, and one of the burr housings The space is The first cylindrical member is surrounded by an axially extending portion and a radially extending portion of the first cylindrical member, and a large-diameter portion of the second cylindrical member, and the other of the burr accommodation spaces is the first cylindrical member. Of the second cylindrical member and the axially extending portion and the radially extending portion of the second cylindrical member .

  According to the above configuration, since the burr accommodation space is formed by bending the plate material, the burr accommodation space can be easily formed only by press molding. Further, since the entirety of the burr receiving space is surrounded by the plate member, it is possible to suppress the burr in the burr receiving space from going outside the burr receiving space.

Further, even when burrs extend on both sides of the joint, the burrs extending on both sides can be respectively accommodated in the burr accommodation spaces located on both sides of the joint. Further, the burr accommodation space portions on both sides thereof can be easily formed by bending the plate material.

  In one embodiment of the electric resistance press-fitting joining structure, the first tubular member forms an axial part of a clutch drum in a clutch device of an automatic transmission mounted on a vehicle, and the second tubular member. Constitutes another part of the clutch drum in the axial direction.

  Thus, even if the clutch drum becomes longer in the axial direction, the clutch drum can be easily manufactured, and it is possible to suppress the occurrence of troubles in the automatic transmission due to burrs. Further, by forming the first tubular member and the second tubular member from different materials, it is possible to reduce the weight of the clutch drum and, consequently, the weight of the automatic transmission.

  In another embodiment of the electric resistance press fitting structure, the first tubular member and the second tubular member are made of materials having different melting points.

  This makes it easier to generate more burrs than when the first tubular member and the second tubular member are made of the same material. However, by appropriately setting the volume of the burr accommodation space, the burr is accommodated in the burr accommodation space and the burr is prevented from being outside the burr accommodation space.

In the electric resistance press-fitting joining structure, the first tubular member extends radially inward from an end of the small diameter portion on the side opposite to the joining portion and is in contact with a radially extending portion of the second tubular member. It is preferable to further have a part.

  With such a flange portion, when the joint portion between the first tubular member and the second tubular member is press-fitted to each other, the joint portion of the first tubular member and the vicinity thereof are prevented from bending inward in the radial direction. be able to. Therefore, it is possible to appropriately join the joining portions of the first tubular member and the second tubular member, and it is easy to secure the joining strength of the joining portion.

  In still another embodiment of the electric resistance press-fitting joining structure, the second tubular member is a bottomed tubular member, and a joining portion of the second tubular member is a peripheral wall portion of the second tubular member. In the vicinity of the corner with the bottom wall.

Thereby, when press-fitting the joint part of a 1st cylindrical member and a 2nd cylindrical member mutually, it can suppress that the joint part of a 2nd cylindrical member and its vicinity part curve inward in a radial direction. . Therefore, it is easy to secure the joining strength of the joining portion between the first tubular member and the second tubular member .

As described above, according to the electrical resistance pressed junction structure of the present invention, formed by bending a burr accommodating space of the sheet, with the burr accommodating space only by press-molding can be easily formed, By enclosing substantially the entirety of the burr receiving space with the plate member, it is possible to prevent the burr in the burr receiving space from going outside the burr receiving space. Further, even if burrs extend on both sides of the joint, the burrs extending on both sides can be accommodated in the burr accommodation spaces located on both sides of the joint. Therefore, it is possible to easily suppress the occurrence of a problem in the automatic transmission due to the burr.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a skeleton view showing an automatic transmission including a clutch device having a clutch drum to which an electric resistance press-fitting connection structure according to an embodiment of the present invention is applied. 3 is an engagement table showing engagement states of friction engagement elements at each shift speed of the automatic transmission. It is sectional drawing which shows the said clutch drum concretely. FIG. 5 is an enlarged cross-sectional view showing the vicinity of a joint between a first cylindrical member and a second cylindrical member in a clutch drum connected to a first ring gear of a first planetary gear set. FIG. 5 is an enlarged cross-sectional view showing a method of electric resistance press-fitting between a first tubular member and a second tubular member in the clutch drum of FIG. 4 in the vicinity of a portion where a first tubular member and a second tubular member are to be joined; .

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

  FIG. 1 shows, as an example, an automatic transmission 10 provided with a clutch device having a clutch drum to which an electric resistance press fitting structure according to an embodiment of the present invention is applied. The automatic transmission 10 is a vertical-type automatic transmission mounted on an FR type vehicle.

  The automatic transmission 10 includes a transmission case 11, an input shaft 12 inserted into the transmission case 11 and receiving power from a driving source (engine, motor, etc.) of the vehicle, and an automatic transmission 10 inside the transmission case 11. A transmission mechanism 14 housed in the transmission case and transmitting power from the driving source via the input shaft 12; an output shaft 13 inserted into the transmission case 11 and outputting the power from the transmission mechanism 14 to the propeller shaft; have.

  The input shaft 12 and the output shaft 13 are coaxially arranged along the vehicle front-rear direction. When the automatic transmission 10 is mounted on the vehicle, the input shaft 12 is located on the front side of the vehicle and the output shaft 13 is located on the rear side of the vehicle. In the following description, the drive source side (the left side in FIG. 1) in the axial direction of the input shaft 12 (the axial direction of the output shaft 13) is referred to as a front side, and the opposite side to the drive source in the axial direction of the input shaft 12 ( The right side of FIG. 1) is called a rear side.

The transmission mechanism 14 includes a first planetary gear set PG1 (hereinafter, referred to as a first gear set PG1), a second planetary gear set PG2 (hereinafter, referred to as a second gear set PG2), and a third planetary gear set PG3 (which are arranged in the axial direction of the input shaft 12). Hereinafter, a third gear set PG3) and a fourth planetary gear set PG4 (hereinafter, referred to as a fourth gear set PG4). The first gear set PG1, the second gear set PG2, the third gear set PG3, and the fourth gear set PG4 are arranged in this order from the front side, and form a plurality of power transmission paths from the input shaft 12 to the output shaft 13. The first to fourth gear sets PG1 to PG4 are arranged on the same axis as the input shaft 12 and the output shaft 13.

  The first gear set PG1 has a first sun gear S1, a first ring gear R1, and a first carrier C1 as rotating elements. The first gear set PG1 is of a single pinion type, and includes a plurality of pinions P1 supported by a first carrier C1 and spaced from each other in a circumferential direction of the first gear set PG1 to form a first sun gear S1 and a first ring gear. It is engaged with both of R1.

  The second gear set PG2 has a second sun gear S2, a second ring gear R2, and a second carrier C2 as rotating elements. The second gear set PG2 is also of a single pinion type, and includes a plurality of pinions P2 supported by the second carrier C2 and spaced from each other in the circumferential direction of the second gear set PG2 to form the second sun gear S2 and the second ring gear. It is engaged with both of R2.

  The third gear set PG3 has a third sun gear S3, a third ring gear R3, and a third carrier C3 as rotating elements. The third gear set PG3 is also of a single pinion type, and includes a plurality of pinions P3 supported by a third carrier C3 and spaced from each other in the circumferential direction of the third gear set PG3 to form a third sun gear S3 and a third ring gear. It is engaged with both of R3.

  The fourth gear set PG4 has a fourth sun gear S4, a fourth ring gear R4, and a fourth carrier C4 as rotating elements. The fourth gear set PG4 is also of a single pinion type, and includes a plurality of pinions P4 supported by a fourth carrier C4 and spaced from each other in the circumferential direction of the fourth gear set PG4 to form a fourth sun gear S4 and a fourth ring gear. It is engaged with both of R4.

  The first sun gear S1 of the first gear set PG1 is divided into two parts in the axial direction of the input shaft 12, and the first sun gear S1a disposed relatively on the front side and the rear first sun gear S1a disposed relatively on the rear side. And one sun gear S1b. That is, the first gear set PG1 is a double sun gear type gear set. The front and rear first sun gears S1a and S1b have the same number of teeth and mesh with the pinion P1 supported by the first carrier C1, so that these front and rear first sun gears S1a and S1b are provided. Are always equal. That is, the front and rear first sun gears S1a and S1b always rotate at the same rotational speed, and when the rotation of one gear is stopped, the rotation of the other gear is also stopped.

  The first sun gear S1 (strictly, the rear first sun gear S1b) and the fourth sun gear S4 are always connected, the first ring gear R1 and the second sun gear S2 are always connected, and the second carrier C2 and the fourth carrier are used. The third carrier C3 is constantly connected to the third carrier C3 and the fourth ring gear R4. The input shaft 12 is always connected to the first carrier C1, and the output shaft 13 is always connected to the fourth carrier C4. Specifically, the input shaft 12 is connected to the first carrier C1 via a power transmission member 18 that passes between the front and rear first sun gears S1a and S1b. The rear first sun gear S1b and the fourth sun gear S4 are connected via a power transmission shaft 15. The second carrier C2 and the fourth carrier C4 are connected via a power transmission member 16.

  The transmission mechanism 14 also includes five friction engagement elements (first clutches) for selecting one of the plurality of power transmission paths formed by the first to fourth gear sets PG1 to PG4 and switching the power transmission path. 20, a second clutch 21, a third clutch 22, a first brake 23, and a second brake 24).

  The first clutch 20 is configured to disconnect and connect the input shaft 12, the first carrier C1, and the third sun gear S3. The first clutch 20 is disposed in front of the first gear set PG1.

  The second clutch 21 is configured to disconnect and connect the first ring gear R1, the second sun gear S2, and the third sun gear S3. The second clutch 21 is provided in front of the first clutch 20.

  The third clutch 22 is configured to connect and disconnect between the second ring gear R2 and the third sun gear S3. The third clutch 22 is disposed in front of the second clutch 21.

  The first brake 23 is configured to connect and disconnect between the first sun gear S1 (strictly, the front first sun gear S1a) and the transmission case 11. The first brake 23 is disposed near the transmission case 11 on the front side of the third clutch 22.

  The second brake 24 is configured to connect and disconnect between the third ring gear R3 and the transmission case 11. The second brake 24 is arranged near the transmission case 11 radially outside the third gear set PG3.

  Each of the above-mentioned friction fastening elements is fastened by supplying hydraulic oil to a fastening hydraulic chamber of each friction fastening element. As shown in the fastening table of FIG. 2, the first to eighth forward speeds and the reverse speed are formed by selectively fastening three friction fastening elements from the five friction fastening elements. In addition, in the fastening table of FIG. 2, a circle indicates that the friction fastening element is engaged, and a blank indicates that the friction fastening element has released (released) the fastening.

  Specifically, the first speed is established by engaging the first clutch 20, the first brake 23, and the second brake 24. The second speed is established by the engagement of the second clutch 21, the first brake 23, and the second brake 24. The third speed is established by the engagement of the first clutch 20, the second clutch 21, and the second brake 24. The fourth speed is established by engaging the second clutch 21, the third clutch 22, and the second brake 24. The fifth speed is established by the engagement of the first clutch 20, the third clutch 22, and the second brake 24. The sixth speed is established by the engagement of the first clutch 20, the second clutch 21, and the third clutch 22. The seventh speed is established by engagement of the first clutch 20, the third clutch 22, and the first brake 23. The eighth speed is established by the engagement of the second clutch 21, the third clutch 22, and the first brake 23. The reverse speed is formed by the engagement of the third clutch 22, the first brake 23, and the second brake 24. At the sixth speed, the rotation speed of the input shaft 12 and the rotation speed of the output shaft 13 are the same.

  FIG. 3 specifically shows clutch drums 5 to 7 as examples of clutch drums to which the electric resistance press-fitting connection structure according to the embodiment of the present invention is applied. In FIG. 3, C is the central axis of the input shaft 12 (the central axis of the output shaft 13), and the central axes of the clutch drums 5 to 7 (the first cylindrical members 50, 60, 70 and the second It is also a cylindrical shaft of the cylindrical members 51, 61, 71). The axial directions of the clutch drums 5 to 7 match the axial direction of the input shaft 12 (the axial direction of the output shaft 13).

  The clutch drum 5 is a clutch drum common to the first clutch 20, the second clutch 21 and the third clutch 22 (these correspond to a clutch device), and has a rear end that is the third clutch of the third gear set PG3. A third sun gear S3 (not shown in FIG. 4) is connected to the connecting member 8 at the front end.

  The clutch drum 6 is a clutch drum of the second clutch 21 and is located radially inside the clutch drum 5. The clutch drum 6 is connected at its rear end to the first ring gear R1 of the first gear set PG1. A plurality of friction plates 31 are attached to the front end of the clutch drum 6. When the second clutch 21 is engaged, the friction plates 31 engage with a plurality of friction plates 35 attached to the connection member 8 so as to be alternately arranged with the friction plates 31.

  The clutch drum 7 is a clutch drum of the third clutch 22 and is located radially inside the clutch drum 5 and radially outside the clutch drum 6. This clutch drum 7 is connected at its rear end to the second ring gear R2 of the second gear set PG2. A plurality of friction plates 32 are attached to the front end of the clutch drum 7. When the third clutch 22 is engaged, the friction plates 32 engage with a plurality of friction plates 36 attached to the connecting member 8 so as to be alternately arranged with the friction plates 32.

  The clutch drum 5 is disposed coaxially with the first cylindrical member 50 on one side (rear side) of the first cylindrical member 50 in the axial direction of the cylinder. And a second cylindrical member 51. That is, the first cylindrical member 50 forms a part of the clutch drum 5 in the axial direction, and the second cylindrical member 51 forms another part of the clutch drum 5 in the axial direction. The second tubular member 51 is a bottomed tubular member formed of a metal plate made of a material different from that of the first tubular member 50, and the first tubular member 50 side (front side) is open.

  Similarly to the clutch drum 5, the clutch drum 6 also includes a first cylindrical member 60 formed of a metal plate, and the first cylindrical member 60 on one side (rear side) of the first cylindrical member 60 in the cylinder axis direction. A second cylindrical member 61 is provided coaxially with the member 60. That is, the first cylindrical member 60 forms a part of the clutch drum 6 in the axial direction, and the second cylindrical member 61 forms another part of the clutch drum 6 in the axial direction. The second tubular member 61 is a bottomed tubular member formed of a metal plate made of a material different from that of the first tubular member 60, and the first tubular member 60 side (front side) is open.

  Similarly to the clutch drum 5, the clutch drum 7 also includes a first cylindrical member 70 formed of a metal plate, and the first cylindrical member 70 on one side (rear side) of the first cylindrical member 70 in the cylinder axis direction. A second cylindrical member 71 is provided coaxially with the member 70. That is, the first cylindrical member 70 forms a part of the clutch drum 7 in the axial direction, and the second cylindrical member 71 forms another part of the clutch drum 7 in the axial direction. The second tubular member 71 is a bottomed tubular member formed of a metal plate made of a material different from that of the first tubular member 70, and the first tubular member 70 side (front side) is open.

  In the present embodiment, the material of the first tubular members 50, 60, 70 is a material having a lower melting point than the material of the second tubular members 51, 61, 71. Specifically, in order to reduce the weight of the clutch drums 5 to 7, the material of the first cylindrical members 50, 60, and 70 is aluminum and an aluminum alloy, and the second cylindrical member, which requires strength for transmitting torque, is used. The material of the members 51, 61, 71 is steel. In addition, in order to reduce the weight of the clutch drums 5 to 7, the material of the first tubular members 50, 60, 70 may be magnesium or a magnesium alloy.

  The rear end of the first cylindrical member 50 and the front end of the second cylindrical member 51 in the clutch drum 5 are joined to each other. That is, the joining portion 50a provided on the outer peripheral surface of the first tubular member 50 and the joining portion 51a provided on the inner peripheral surface of the second tubular member 51 are press-fitted to each other and are joined by electric resistance.

  The rear end of the first cylindrical member 60 and the front end of the second cylindrical member 61 in the clutch drum 6 are also joined to each other, similarly to the clutch drum 5. That is, the joining portion 60a provided on the outer peripheral surface of the first tubular member 60 and the joining portion 61a provided on the inner peripheral surface of the second tubular member 61 are press-fitted to each other and are joined by electric resistance.

  The rear end of the first cylindrical member 70 and the front end of the second cylindrical member 71 in the clutch drum 7 are also joined to each other similarly to the clutch drums 5 and 6. That is, the joint portion 70a provided on the outer peripheral surface of the first tubular member 70 and the joint 71a provided on the inner peripheral surface of the second tubular member 71 are press-fitted to each other and are joined by electric resistance.

  Hereinafter, the electrical resistance press fitting structure of the clutch drum 6 will be described in detail with reference to FIG. In this description, the cylinder axis direction of the first tubular member 60 (the cylinder axis direction of the second tubular member 61) is simply referred to as the cylinder axis direction. The electrical resistance press fitting structure of the clutch drums 5 and 7 is also the same as the electrical resistance press fitting structure of the clutch drum 6, and a description thereof will be omitted.

  Joint portions 60a and 61a which are press-fitted and electrically connected to each other are provided on the outer peripheral surface of the first cylindrical member 60 and the inner peripheral surface of the second cylindrical member 61 over the entire circumferential direction. . Before joining of the joining portion 60a on the outer peripheral surface of the first cylindrical member 60, the joining scheduled portion 60b has a slightly larger diameter than the joining portion 60a (see a two-dot chain line in FIG. 4 and FIG. 5). On the other hand, before joining the joining portion 61a on the inner peripheral surface of the second cylindrical member 61, the joining scheduled portion 61b is slightly smaller in diameter than the joining portion 61a (see a two-dot chain line in FIG. 4 and FIG. 5). . That is, the planned joining portion 61b has a slightly smaller diameter than the planned joining portion 60b, but the joined portions 60a and 61a after joining have the same diameter.

  The first tubular member 60 is provided adjacent to the joining portion 60a (61a) on the opposite side (front side) of the second tubular member 61 in the cylinder axis direction, and has an outer diameter substantially equal to that of the joining portion 60a. An axially extending portion 60c having the same diameter and extending in the cylinder axis direction is provided. Strictly speaking, the outer diameter of the axially extending portion 60c is the same as that of the portion 60b to be joined, and slightly larger than the diameter of the joining portion 60a (in FIGS. 4 and 5, it is exaggerated). Drawing).

  Further, the first cylindrical member 60 has a radially extending portion 60d extending radially outward from an end of the axially extending portion 60c on the side opposite to the joining portion 60a (front side), and a joining portion 60a (61a). And a small-diameter portion 60e having an outer diameter smaller than the joining portion 60a and provided adjacent to the second cylindrical member 61 side (rear side) in the cylinder axis direction. In the present embodiment, the small-diameter portion 60e is formed in a tapered shape that gradually decreases in diameter toward the rear side. May have a constant diameter.

  Further, in the present embodiment, the first cylindrical member 60 further has a flange portion 60f extending radially inward from an end of the small-diameter portion 60e on the side opposite to the joining portion 60a (rear side). The flange portion 60f is not always necessary, and can be omitted.

  The second cylindrical member 61 is provided adjacent to the first cylindrical member 60 side (front side) in the cylinder axis direction with respect to the joint 61a (60a), and has an inner diameter larger than that of the joint 61a. The large-diameter portion 61c is provided adjacent to the joining portion 61a on the opposite side (rear side) of the first cylindrical member in the cylinder axis direction, and has an inside diameter substantially equal to that of the joining portion 61a. And an axially extending portion 61d extending in the direction. In the present embodiment, the large-diameter portion 61c gradually increases in diameter toward the front side and then extends forward with a constant diameter, but has a step between the large-diameter portion 61c and the large-diameter portion. The entirety of 61c in the cylinder axis direction may have a constant diameter. Strictly, the inner diameter of the axially extending portion 61d is the same diameter as the portion to be joined 61b, and is slightly smaller than the diameter of the joining portion 61a. The second cylindrical member 61 further includes a radially extending portion 61e extending radially inward from an end of the axially extending portion 61d on the side opposite to the joining portion 61a (rear side).

  The front end of the large diameter portion 61 c of the second cylindrical member 61 is in contact with the radially extending portion 60 d of the first cylindrical member 60. Thereby, between the outer peripheral surface of the first tubular member 60 and the inner peripheral surface of the second tubular member 61, the opposite side of the second tubular member 61 in the tubular axis direction with respect to the joints 60a, 60b. On the (front side), a first burr housing space portion 91 surrounded by the axially extending portion 60c and the radially extending portion 60d of the first cylindrical member 60 and the large diameter portion 61c of the second cylindrical member 60 is provided. It is formed. The first burr accommodation space 91 accommodates a burr 95 (see FIG. 4) extending forward from the joints 60a, 60b of the first tubular member 60 and the second tubular member 61. The large diameter of the axially extending portion 60c and the radially extending portion 60d of the first cylindrical member 60 and the large diameter of the second cylindrical member 61 so that the stored burr 95 does not come out of the first burr housing space portion 91. The entirety of the first burr receiving space portion 91 is surrounded by the portion 61c. The burr 95 in the first burr receiving space 91 is located between the front end of the large diameter portion 61c of the second tubular member 61 and the radially extending portion 60d of the first tubular member 60. There may be a gap of such an amount that it does not come out of one burr accommodation space portion 91. That is, substantially the entire first burr receiving space 91 may be surrounded to the extent that the burr 95 in the first burr receiving space 91 does not protrude from the first burr receiving space 91.

  The rear end of the small diameter portion 60e and the flange portion 60f of the first cylindrical member 60 are in contact with the radially extending portion 61e of the second cylindrical member 61. Thereby, between the outer peripheral surface of the first cylindrical member 60 and the inner peripheral surface of the second cylindrical member 61, the joint portions 60a, 61a are closer to the second cylindrical member 61 in the cylinder axis direction (rear side). ), A second burr receiving space 92 surrounded by the small-diameter portion 60e of the first cylindrical member 60 and the axially extending portion 61d and the radially extending portion 61e of the second cylindrical member 61 is formed. . The second burr accommodation space 92 accommodates a burr 95 extending rearward from the joints 60 a, 61 a of the first tubular member 60 and the second tubular member 61. The small-diameter portion 60e of the first cylindrical member 60 and the axially extending portion 61d and the radially extending portion of the second cylindrical member 61 do not allow the accommodated burr 95 to come out of the second burr accommodation space 92. 61e, the entire second burr accommodation space 92 is surrounded. Note that, similarly to the first burr housing space portion 91, substantially the entire second burr housing space portion 92 is surrounded to the extent that the burr 95 in the second burr housing space portion 92 does not protrude from the second burr housing space portion 92. It may be.

  As described above, in the present embodiment, the first tubular member 60 and the second tubular member 61 are joined to each other at the joining portion 60 a between the outer peripheral surface of the first tubular member 60 and the inner peripheral surface of the second tubular member 61. , 61a, on both sides in the cylinder axis direction, first and second burrs accommodating space portions 91, 92 for accommodating burrs 95 extending from the joint portions 60a, 61a are formed respectively. It is bent so as to surround the entirety of the burr accommodation spaces 91 and 92, respectively. That is, the first and second burr accommodation spaces 91 and 92 are formed by bending a plate material.

  In this embodiment, the burr 95 largely extends to the front side of the joints 60a and 61a. For this reason, the capacity of the first burr housing space 91 is made larger than the capacity of the second burr housing space 92.

  Next, a method of electric resistance press fitting between the first tubular member 60 and the second tubular member 61 of the clutch drum 6 will be described with reference to FIG. As shown in FIG. 5, in this electric resistance press-fitting joining method, the first tubular member 60 and the second tubular member 61 are positioned at their tubular shafts (in FIG. 5, at a position far away from the right side). (Not shown) is arranged so as to extend in the vertical direction, so in the description of the electric resistance press-fitting method, the rear side when mounted on a vehicle is referred to as the upper side, and when mounted on a vehicle, The front side is called the lower side. The method of electric resistance press-fitting of the clutch drums 5 and 7 is the same as the method of electric resistance press-fitting of the clutch drum 6, and a description thereof is omitted.

  First, a first cylindrical member 60 is formed by press-forming an aluminum or aluminum alloy plate, and a second cylindrical member 61 is formed by press-forming a steel plate. At the time of these moldings, the to-be-joined portions 60b, 61b, which are press-fitted and electrically resistance-joined to each other on the outer peripheral surface of the first cylindrical member 60 and the inner peripheral surface of the second cylindrical member 61, over the entire circumference in the circumferential direction. The first tubular member 60 is provided with the above-described axially extending portion 60c, the radially extending portion 60d, the small-diameter portion 60e, and the flange portion 60f, and the second tubular member 61 is provided with: The large diameter portion 61c, the axially extending portion 61d, and the radially extending portion 61e described above are provided.

  The shape of the first cylindrical member 60 after the molding is the same as the shape of the first cylindrical member 60 after the above-described bonding, except for the portion to be joined 60b, and the shape of the second cylindrical member 61 after the above-mentioned molding. The shape is the same as the above-described shape of the second cylindrical member 61 except for the portion to be joined 61b. That is, at the time of the above-described molding, the joining scheduled portions 60b and 61b are provided on the outer circumferential surface of the first tubular member 60 and the inner circumferential surface of the second tubular member 61 over the entire circumference in the circumferential direction, respectively. When the first and second cylindrical members 60b and 61b are joined to each other, the outer peripheral surface of the first cylindrical member 60 and the inner peripheral surface of the second cylindrical member 61 are on both sides in the cylinder axis direction with respect to the portions to be joined 60b and 61b. And first and second burrs accommodating space portions 91 and 92 for accommodating burrs 95 extending from the portions to be joined 60b and 61b (joining portions 60a and 61a), respectively. , 92 are bent so as to surround the first tubular member 60 and the second tubular member 61, respectively.

  Subsequently, the formed second cylindrical member 61 is disposed coaxially with the first cylindrical member 60 above the first cylindrical member 60 so that the outer peripheral surface of the first cylindrical member 60 The inner peripheral surface of the second cylindrical member is press-fitted to each other and joined by electric resistance.

  Specifically, a lower electrode 97 made of a ring-shaped copper, and an upper electrode 98 made of a ring-shaped copper disposed coaxially with the lower electrode 97 above the lower electrode 97 are provided. A pressurization device is prepared. The lower electrode 97 and the upper electrode 98 also serve as a pressing member, and are disposed between the lower electrode 97 and the upper electrode 98 by moving the upper electrode 98 toward the lower electrode 97. The member can be pressurized.

  Then, the first tubular member 60 is set so that the radially extending portion 60c of the first tubular member 60 is placed on the lower electrode 97. At this time, the cylindrical axis of the first cylindrical member 60 substantially coincides with the central axis of the lower electrode 97.

  Subsequently, the second tubular member 61 is set above the first tubular member 60 on the lower electrode 97. At this time, the lower end of the to-be-joined portion 61b of the second tubular member 61 abuts on the upper end of the to-be-joined portion 60b of the first tubular member 60, and the tubular axis of the second tubular member 61 is adjusted to the first tubular member. It substantially coincides with 60 cylinder axes. FIG. 5 shows this contact state.

  Next, by moving the upper electrode 98 toward the lower electrode 97 and pressing the first and second cylindrical members 60 and 61 by the lower electrode 97 and the upper electrode 98, the first cylindrical member 60 and The parts to be joined 60b, 61b of the second tubular member 61 are press-fitted to each other. At this time, current flows between the first and second tubular members 60 and 61 via the lower electrode 97 and the upper electrode 98. Thus, the to-be-joined portions 60b, 61b are press-fitted to each other by the lower electrode 97 and the upper electrode 98, and are joined by electric resistance.

  At the time of joining the joining portions 60b and 61b, the surfaces of the joining portions 60b and 61b are shaved, and burrs 95 are generated. In the present embodiment, the surface of the to-be-joined portion 60b of the first tubular member 60, which is a particularly cylindrical member having a lower melting point, is largely shaved, and is moved downward of the to-be-joined portion 61b relative to the to-be-joined portion 60b. Along with this, many burrs 95 extend downward from the planned joining portions 60b, 61b (joining portions 60a, 61a). In addition, a small amount of burrs 95 extending upward from the portions to be joined 60b and 61b (joined portions 60a and 61a) are also generated, though the amount is small.

  In the present embodiment, when the joining scheduled portions 60b, 61b of the first tubular member 60 and the second tubular member 61 have been joined, the first and second burr accommodation space portions 91, 92 are completely formed. At the same time, the burrs 95 extending downward and upward are accommodated in the first and second burr accommodation spaces 91 and 92, respectively.

  Further, in the present embodiment, since the first tubular member 60 has the flange portion 60f that contacts the radially extending portion 61e of the second tubular member 61, the first tubular member 60 and the second tubular member 60 are provided. When press-fitting the joint portions 60b, 61b (joint portions 60a, 61a) of the first cylinder member 61, the joint portion 61b (joint portion 61a) of the second tubular member 61 and the vicinity thereof bend inward in the radial direction. Is suppressed. As a result, the joining portions 60a, 61a of the first tubular member 60 and the second tubular member 61 are appropriately joined to each other, and the joining strength of the joining portions 60a, 61a is easily ensured.

Further, like the clutch drum 5, the joint 51a of the second tubular member 51 is provided near the corner of the peripheral wall 51b of the second tubular member 51 with the bottom wall 51c (see FIG. 3 ). When the joints 50a, 51a (to be joined) of the first tubular member 50 and the second tubular member 51 are press-fitted to each other, the joint 51a of the second tubular member 51 and the vicinity thereof are radially inward. Bending is suppressed. This also makes it easy to secure the joint strength of the joints 50a and 51a.

  Therefore, in the present embodiment, since the first and second burr receiving space portions 91 and 92 are formed by bending the plate material, the first and second burr receiving space portions 91 and 92 are easily formed only by press molding. be able to. Further, since the entire first and second burr receiving space portions 91 and 92 are surrounded by the plate material, the burr 95 in the first and second burr receiving space portions 91 and 92 is reduced by the first and second burr receiving space portions 91 and 92. , 92 can be suppressed. As a result, the burrs 95 protruding outside the first and / or second burr receiving space portions 91 and 92 are sandwiched between gears meshing with each other in at least one of the first to fourth gear sets PG1 to PG4. And no clogging of the oil passage through which lubricating oil flows. Therefore, it is possible to easily prevent the flash 95 from causing a problem in the automatic transmission.

  Further, in the present embodiment, since the axial length of the clutch drums 5 to 7 is long, when the entire clutch drums 5 to 7 are integrally formed of steel, it becomes difficult to form the clutch drums 5 to 7 together. , Also increase the weight. However, in the present embodiment, even if the length of the clutch drums 5 to 7 in the axial direction is long, the clutch drums 5 to 7 can be easily manufactured, and the weight of the clutch drums 5 to 7 can be reduced. be able to.

  The present invention is not limited to the above embodiment, and may be substituted without departing from the scope of the claims.

For example, in the above embodiment, the material of the first tubular member 50, 60, 70 of the clutches drum 5-7 and the material of the second tubular member 51, 61, 71 are different from each other (melting point different However, the first tubular members 50, 60, 70 and the second tubular members 51, 61, 71 may be made of the same material. Also in this case, the clutch drums 5 to 7 long in the axial direction can be easily manufactured.

  Further, in the above-described embodiment, the example in which the present invention is applied to the clutch drums 5 to 7 of the automatic transmission 10 has been described. However, any tubular member that can be divided into a first tubular member and a second tubular member will be described. It can be applied to anything. The materials of the first tubular member and the second tubular member can be arbitrarily set according to the characteristics required for the tubular member.

  The above embodiments are merely examples, and the scope of the present invention should not be interpreted in a limited manner. The scope of the present invention is defined by the claims, and all modifications and changes that fall within the equivalent scope of the claims are within the scope of the present invention.

The present invention relates to a first cylindrical member formed of a plate material, and a second cylindrical member disposed coaxially with the first cylindrical member on one side of the first cylindrical member in the cylinder axis direction and formed of a plate material. And a joint part which is press-fitted to each other and which is electrically resistance-joined to the outer peripheral surface of the first cylindrical member and the inner peripheral surface of the second cylindrical member over the entire circumferential direction. It is useful for an electric resistance press-fitting joint structure .

5 Clutch drum 6 Clutch drum 7 Clutch drum 50 First cylindrical member 50a Joining section 51 Second tubular member 51a Joining section 51b Peripheral wall section 51c Bottom wall section 60 First tubular member 60a Joining section 60b Planned joining section 60c Axial direction Extending portion 60d Radially extending portion 60e Small diameter portion 60f Flange portion 61 Second cylindrical member 61a Joining portion 61b Planned joining portion 61c Large diameter portion 61d Axial extending portion 61e Radially extending portion 70 First tubular member 71 second cylindrical member 91 first burr housing space 92 second burr housing space 95 burr

Claims (5)

A first cylindrical member formed of a plate material, and a second cylindrical member formed coaxially with the first cylindrical member and formed of a plate material on one side of the first cylindrical member in the cylinder axis direction. An electric resistance press-fitting, in which the outer peripheral surface of the first cylindrical member and the inner peripheral surface of the second cylindrical member are press-fitted to each other and joined by electric resistance over the entire circumferential direction. A joint structure,
The first cylindrical member and the second cylindrical member are arranged between the outer peripheral surface of the first cylindrical member and the inner peripheral surface of the second cylindrical member in the cylindrical axial direction with respect to the joint. both sides to form a burr accommodating space for accommodating the burr extending from the joint portion of the first tubular member and second tubular member and so as to surround substantially the entirety of the burr accommodating space, folding Has been
The first cylindrical member is provided adjacent to the joint in a direction opposite to the second cylindrical member in the cylinder axis direction, and has an outer diameter substantially equal to that of the joint and has a cylindrical axis direction. An axially extending portion extending in the axial direction, a radially extending portion extending radially outward from an end of the axially extending portion on the side opposite to the joining portion, and a second cylinder extending in the cylinder axis direction with respect to the joining portion. Having a small-diameter portion having an outer diameter smaller than the joint portion, provided adjacent to the shape member side,
The second cylindrical member is provided adjacent to the joint portion on the first cylindrical member side in the cylinder axis direction, and has a large-diameter portion having an inner diameter larger than the joint portion; An axially extending portion that is provided adjacent to the portion on the opposite side of the first cylindrical member in the cylinder axis direction and has an inner diameter substantially equal to the joint portion and extends in the cylinder axis direction; A radially extending portion extending radially inward from an end of the direction extending portion on the side opposite to the joining portion,
One of the burr receiving space portions is surrounded by an axially extending portion and a radially extending portion of the first cylindrical member, and a large diameter portion of the second cylindrical member,
The other burr accommodation space is surrounded by a small-diameter portion of the first cylindrical member and an axially extending portion and a radially extending portion of the second cylindrical member. Resistance press-fit junction structure. The electric resistance press fitting structure according to claim 1,
The first tubular member forms a part of an axial direction of a clutch drum in a clutch device of an automatic transmission mounted on a vehicle,
The electric resistance press-fitting joining structure, wherein the second cylindrical member forms another portion in the axial direction of the clutch drum. The electric resistance press-fitting structure according to claim 1 or 2,
The first tubular member and the second tubular member are made of materials having different melting points from each other. The electrical resistance press-fitting structure according to any one of claims 1 to 3 ,
The first cylindrical member further includes a flange portion extending radially inward from an end of the small-diameter portion on the side opposite to the joining portion and contacting a radially extending portion of the second cylindrical member. Electrical resistance press-fit junction structure. The electrical resistance press-fitting structure according to any one of claims 1 to 4 ,
The second tubular member is a bottomed tubular member,
The electric resistance press-fitting connection structure, wherein the joint portion of the second cylindrical member is provided near a corner of the peripheral wall portion of the second cylindrical member with the bottom wall portion.

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