JP2009103260A - Power transmission component and manufacturing method thereof - Google Patents

Abstract

A power transmission component capable of increasing the coupling strength of a first member and a second member by welding and a method of manufacturing the power transmission component.
A power transmission component includes a carrier 31 as a first member and a base member 32 as a second member that rotate about a common rotation center, and the carrier 31 has a radius from the rotation center. An arm portion 31B extending in the axial direction is formed at a position away from the direction, and a hole 45 into which the tip portion 31C of the arm portion 31B serving as the axially extending portion of the carrier 31 is inserted is formed in the base member 32. One of the tip portion 31C and the hole 45 is formed, and two inclined surfaces 51 and 52 are tapered toward the insertion side in the outer diameter side and the inner diameter side of the rotation center portion. When the tip 31C is inserted into the hole 45 while being guided by the inclined surfaces 51 and 52, the tip 31C is welded to the hole 45 by resistance welding.
[Selection] Figure 6

Description

  The present invention relates to a component disposed in a power transmission path for transmitting rotational power and a manufacturing method thereof, and includes, for example, a differential device such as a center differential device for unequal distribution of front and rear wheel torque of a four-wheel drive vehicle. It can be applied to parts for various power transmission devices.

In Patent Document 1 below, there is a component that is arranged in a power transmission path for transmitting rotational power, and a power transmission component for a center differential device for unequal distribution of front and rear wheel torque of a four-wheel drive vehicle. It is shown. The power transmission component includes a first member serving as a carrier for the planetary gear mechanism, and a base member that rotates around a rotation center common to the first member. In the member, an arm portion extending in the axial direction is formed at a position away from the rotation center portion in the radial direction, and the tip portion of the arm portion serving as the axial extension portion of the first member is the second member. The first member and the second member are combined and integrated by being inserted into the hole formed in the hole and welding the tip of the arm part to the hole.
JP 2004-332834 (0043 paragraph, FIG. 1)

  The power transmission component described above receives a large torsional torque for transmission of rotational power. For this reason, it is required to increase the coupling strength between the first member and the second member. For this purpose, the tip portion of the arm portion that is the axially extending portion of the first member and the tip portion are inserted. It is required to increase the bonding strength by welding with the hole of the second member.

  An object of the present invention is to provide a power transmission component and a method for manufacturing the power transmission component that can increase the bonding strength of the first member and the second member by welding.

  The power transmission component according to the present invention is a component disposed in a power transmission path through which rotational power is transmitted, and includes a first member and a second member that rotate around a common rotation center. The first member is formed with an axially extending portion extending in the axial direction at a position radially away from the rotation center portion, and the tip of the axially extending portion is the first portion. In the power transmission component inserted into the hole formed in the two members, and the tip part is welded to the hole, one of the hole and the tip part has an outer diameter side related to the rotation center part. In the portion of the inner diameter side, two inclined surfaces are formed in a tapered shape toward the insertion side, and the tip portion is welded to the hole by resistance welding at these inclined surface portions. It is a feature.

  In this power transmission component, the tip portion of the axially extending portion formed on the first member is coupled to the hole of the second member by welding by resistance welding at the two inclined surface portions. Since the two inclined surfaces are tapered toward the side where the tip portion is inserted into the hole, these inclined surfaces have an inclination angle with respect to the axial direction. For this reason, it is possible to increase the volume of the solidified solid portion formed by energization for resistance welding, compared to the case where the tip and the hole are joined by welding at the portion of the surface that does not have an inclination angle with respect to the axial direction. Thus, the bond strength by welding between the first member and the second member can be increased.

  And increasing the volume of the melted and solidified part in this way forms the above-described two inclined surfaces in one of the tip part of the axially extending part of the first member and the hole of the second member. Since the volume of the melted and solidified portion is not increased by increasing the welded portion, the first member and the second member are reduced in diameter, in other words, the power transmission component is reduced in size. be able to.

  A method for manufacturing a power transmission component according to the present invention is a method for manufacturing a component disposed in a power transmission path through which rotational power is transmitted, and includes a first member that rotates around a common rotation center and a first member. The first member is formed with an axially extending portion extending in the axial direction at a position separated from the rotation center portion in the radial direction, and the axially extending portion is formed. In the method of manufacturing a power transmission component in which a tip portion of a part is inserted into a hole formed in the second member and the tip part is welded to the hole, one of the hole and the tip part is provided. The step of forming two inclined surfaces in a tapered shape toward the insertion side in the outer diameter side and the inner diameter side of the rotation center portion, and while inserting the tip portion into the hole, The tip is joined to the hole by resistance welding at two inclined surfaces. And it is characterized in that it includes the step of welding, the.

  In this manufacturing method, after the operation of forming the two inclined surfaces in one of the tip of the axially extending portion of the first member and the hole of the second member, the shaft of the first member is performed. While inserting the tip portion of the direction extending portion into the hole of the second member, an operation of welding the tip portion to the hole at the two inclined surfaces by resistance welding is performed. Since the two inclined surfaces are formed in a shape in which the tip portion is tapered toward the side where the tip portion is inserted into the hole, the operation of inserting the tip portion into the hole, that is, the tip portion into the hole with a pressurized load. The press-fitting work can be performed by a small press machine having a pressure capacity that is not so large.

  Further, since the two inclined surfaces are formed in a shape in which the tip portion is tapered toward the side where the tip portion is inserted into the hole, when the tip portion is inserted into the hole, the tip portion with respect to the hole is caused by these inclined surfaces. Therefore, the tip portion can be reliably inserted into the hole.

  The two inclined surfaces described above may be formed in the hole of the second member, or may be formed at the tip of the axially extending portion of the first member. In the case where two inclined surfaces are formed in the hole of the second member, the portion where these inclined surfaces are formed is the outer diameter side with respect to the common center of rotation of the first member and the second member in the hole. It becomes the part with the inner diameter side. When two inclined surfaces are formed at the tip of the axially extending portion of the first member, the portion where these inclined surfaces are formed is common to the first member and the second member at the tip. It becomes the part of the outer diameter side and inner diameter side regarding a rotation center part.

  When two inclined surfaces are formed in the hole of the second member, the length in the radial direction centered on the rotation center portion is set at the end of the two inclined surfaces in the hole on the insertion side. You may form the stop part which has and can stop insertion of a front-end | tip part.

  According to this, since the front end surface of the front part abuts against the stop part, it is possible to stop further insertion of the front part into the hole, so the insertion depth of the front part into the hole can be reduced by the stop part. It can be set accurately.

  The power transmission component according to the present invention is a component disposed in a power transmission path through which rotational power is transmitted, and includes a first member and a second member that rotate around a common rotation center. The first member is formed with an axially extending portion extending in the axial direction at a position radially away from the rotation center portion, and a tip portion of the axially extending portion is formed on the first member. In the power transmission component inserted into the hole formed in the second member and the tip portion welded to the hole, one of the hole and the tip portion has an outer portion related to the rotation center portion. A first inclined surface is formed in one of the diameter side and the inner diameter side, and the other of the hole and the tip portion includes an outer diameter side and an inner diameter side related to the rotation center portion. And the second inclined surface is formed in the other portion of It is characterized in that the tip portion at a portion of the first and second inclined surface forms a tapered shape to the entry side is welded by resistance welding into the hole.

  Also in this power transmission component, the tip of the axially extending portion formed in the first member and the hole of the second member are joined by resistance welding at two inclined surface portions. . Since these inclined surfaces have an inclination angle with respect to the axial direction, it is more suitable for resistance welding than when the tip portion and the hole are joined by welding at a portion of the surface not having the inclination angle with respect to the axial direction. The volume of the melted and solidified portion formed by energization can be increased, thereby increasing the bonding strength of the first member and the second member by welding.

  And increasing the volume of the melted and solidified portion in this way means that one of the tip portion of the axially extending portion of the first member and the hole of the second member has an outer diameter side related to the rotation center portion. A first inclined surface is formed in one portion of the inner diameter side, and the other of the tip portion of the axially extending portion of the first member and the hole of the second member is externally attached to the rotation center portion. This is performed by forming the second inclined surface in the other part of the diameter side and the inner diameter side, and does not increase the volume of the melt-solidified part by increasing the part to be welded. The diameter of the first member and the second member can be reduced, in other words, the power transmission component can be reduced in size.

  The power transmission component manufacturing method according to the present invention is a method for manufacturing a component disposed in a power transmission path through which rotational power is transmitted, and is a first member that rotates around a common rotation center. And an axially extending portion extending in the axial direction at a position spaced apart from the rotation center portion in the radial direction, and the axial direction of the first member. In the method of manufacturing a power transmission component in which the tip portion of the extension portion is inserted into a hole formed in the second member, and the tip portion is welded to the hole, the hole and the tip portion are On the other hand, a first inclined surface is formed in one of the outer diameter side and the inner diameter side of the rotation center portion, and the other of the hole and the tip portion is related to the rotation center portion. In the other part of the outer diameter side and the inner diameter side, A step of forming an inclined surface, and resistance of the tip portion to the hole at the portion of the first and second inclined surfaces that are tapered toward the insertion side while the tip portion is inserted into the hole. And a step of welding by welding.

  Also in this manufacturing method, the first inclined surface and the second inclined surface are formed in a shape in which the tip portion of the axially extending portion of the first member is tapered toward the side inserted into the hole of the second member. For this reason, the operation of inserting the tip portion into the hole, that is, the operation of press-fitting the tip portion into the hole with a pressurizing load can be performed by a small press machine that does not have a large pressurizing capacity.

  In addition, since the first inclined surface and the second inclined surface are formed in a shape in which the tip portion is tapered toward the side where the tip portion is inserted into the hole, when the tip portion is inserted into the hole, Positioning of the tip portion with respect to the hole can be automatically performed, so that the tip portion can be reliably inserted into the hole.

  The first inclined surface and the second inclined surface are the portions of the outer diameter side and the inner diameter side at the tip of the axially extending portion of the first member and the outer diameter side and the inner diameter side of the hole of the second member. You may form in any part of them. And when the surface of the second member in which the hole is formed faces the first member is a flat surface on which the one projecting toward the first member is not formed, the first Preferably, the inclined surface is formed on the outer diameter side portion of the tip of the axially extending portion of the first member, and the second inclined surface is formed on the inner diameter side portion of the hole of the second member.

  According to this, it is not necessary to form an inclined surface in the inner diameter side portion of the tip portion of the axially extending portion of the first member, and the inclined surface instead of the inclined surface is an inner diameter side portion of the hole of the second member. It becomes the inclined surface formed.

  In the case where an inclined surface is formed at the inner diameter side portion of the tip portion of the axial extension portion of the first member, the inner diameter side space is smaller than the tip portion of the axial extension portion of the first member. For this reason, it is difficult to form an inclined surface on the inner diameter side portion of the tip, or a lot of labor and a long time are required.

  However, as described above, in the second member in which the hole is formed, the surface facing the first member is a flat surface on which the one protruding toward the first member is not formed. In the case where the inclined surface is not formed on the inner diameter side portion of the tip portion of the axially extending portion of the first member, and the inclined surface instead of the inclined surface is formed on the inner diameter side portion of the hole of the second member Since the surface of the second member facing the first member is the flat surface described above, it is possible to easily perform the operation of forming the inclined surface in the inner diameter side portion of the hole of the second member. Become. And since the space of the outer diameter side rather than the tip part of the axial direction extension part of the 1st member is a space greatly opened toward the outer diameter side, the tip of the axial direction extension part of the first member The operation of forming the inclined surface in the outer diameter side portion of the portion can be easily performed.

  Therefore, the operation of forming the two inclined surfaces can be easily performed with less effort and a short time.

  In the present invention described above, the number of the axially extending portions extending in the axial direction of the first member may be one or plural. When the number of axially extending portions is one, the axially extending portion is cylindrical. Further, when the number of the axially extending portions is plural, these axially extending portions are equally spaced in the circumferential direction around the common rotation center portion of the first member and the second member. Provided at unequal intervals.

  In the present invention, the hole formed in the second member may be a through hole or a non-through hole.

  In addition, the power transmission component according to the present invention can be applied as a component for configuring a power transmission path in any transportation means such as a vehicle, a ship, and an aircraft, a work machine, and a machine tool.

  When the power transmission component according to the present invention is a component arranged in a power transmission path for transmitting the traveling power of the vehicle, the first member is used as an example to transmit the power of the vehicle. It can be a carrier for a planetary gear mechanism arranged in the path.

  In this case, the planetary gear mechanism may constitute a center differential device of a four-wheel drive vehicle, or may constitute a front wheel differential device of a four-wheel drive vehicle, or constitute a rear wheel differential device of a four-wheel drive vehicle. You may do it. The planetary gear mechanism may constitute a front wheel differential device for a front wheel drive vehicle, or may constitute a rear wheel differential device for a rear wheel drive vehicle. Further, the planetary gear mechanism may be a planetary gear mechanism for an automatic transmission.

  In addition, the resistance welding that welds and joins the tip of the axially extending portion of the first member and the hole of the second member may be capacitor welding with a short energization time, or inverter welding with a long energization time than this capacitor. Good.

  According to the present invention, it is possible to obtain an effect that the coupling strength by welding of the first member and the second member constituting the power transmission component can be increased.

  EMBODIMENT OF THE INVENTION Below, the form for implementing this invention is demonstrated based on drawing. The power transmission component according to the present embodiment is a component for a planetary gear mechanism that is disposed in a power transmission path that transmits rotational power for the vehicle to travel, and provides torque to front and rear wheels of a four-wheel drive vehicle. It is a part constituting a center differential device for unequal distribution. First, the unequal torque distribution center differential device will be described.

  FIG. 1 shows a power transmission path in which a center differential device for unequal torque distribution is used. The power generated in the engine 1 is output from the speed change output shaft 4 of the speed change mechanism 3 via the torque converter 2, and the power from the speed change output shaft 4 is output to the front wheel side via the unequal torque distribution center differential device 5. It is output to the shaft 6 and the rear wheel side output shaft 7. The center differential device 5 includes a combination of a compound planetary gear mechanism 8 and a differential limiting friction clutch 9.

  The compound planetary gear mechanism 8 includes a carrier 31 in which a gear 11 that meshes with the gear 10 of the front wheel side output shaft 6 is attached to the carrier main body 31A, and the tip of an arm 31B having a length in the axial direction of the carrier 31. The base member 32 is coupled to and integrated with the drum member 9A of the clutch 9, the pinion shaft 12 is installed on the carrier body 31A and the base member 32, and is freely rotatable on the pinion shaft 12. And a pinion 13 having a first pinion portion 13A of a helical tooth and a second pinion portion 13B of a helical tooth. The first pinion portion 13A meshes with the sun gear 14 of the transmission output shaft 4, and the second pinion portion 13B meshes with the sun gear 15 of the rear wheel side output shaft 7.

  When the rotational power from the speed change output shaft 4 is input to the compound planetary gear mechanism 8, this rotational power is generated by the rotation of the carrier 31 around the speed change output shaft 4 and the revolution and rotation of the pinion 13. 6 and the rear wheel side output shaft 7. Further, when a large rotational speed difference due to slip or the like occurs between the front wheels and the rear wheels, the clutch 9 is not illustrated by a hydraulic device controlled by a control device to which a signal from a sensor that detects this is input. The piston moves in the axial direction, and the frictional force of the clutch 79 thereby prevents the occurrence of a large rotational speed difference between the front and rear wheels.

  Further, the torque distribution from the speed change output shaft 4 to the front wheels and the rear wheels via the compound planetary gear mechanism 8 is determined by the teeth of the first pinion portion 13A, the second pinion portion 13B, the sun gear 14, and the sun gear 15. For example, the front wheels are unequally distributed to 45% and the rear wheels to 55% because of the number relationship.

  Thus, when the torque transmitted from the speed change output shaft 4 is unevenly distributed to the front and rear wheels by the compound planetary gear mechanism 8, the torque output position to the front wheel side and the torque output position to the rear wheel side are in the axial direction. Because of the deviation, the power transmission component 30 which is a component forming the compound planetary gear mechanism 8 and includes the carrier 31 and the base member 32 receives a torsional torque corresponding to the difference in unequal torque. become.

  Further, for example, when the vehicle is stopped and the front and rear wheels are locked by depressing the brake pedal, and when the amplified torque (stall torque) by the torque converter 2 is generated by sudden depression of the accelerator pedal, the power transmission component No. 30, torsion torque based on this amplified torque acts.

  FIG. 2 is a side sectional view of the power transmission component 30 including the carrier 31 and the base member 32, and the carrier 31 and the base member 32 rotate around a common rotation center A. FIG. 3 is a perspective view of a carrier 31 serving as a first member among members constituting the power transmission component 30, FIG. 4 is a front view of the carrier 31, and FIG. 5 is a power transmission component. 3 is a front view of a base member 32 serving as a second member among members constituting 30. FIG. In FIG. 5, the drum member 9A for the differential limiting friction clutch 9 which is coupled to the outer peripheral portion of the base member 32 by welding is omitted. In addition, the carrier 31 and the base member 32 in the present embodiment are press-formed products made of metal plates.

  As shown in FIGS. 3 and 4, a hole 40 through which the speed change output shaft 4 is inserted is formed at the center of the carrier body 31A of the carrier 31, and the outer peripheral surface of the carrier body 31A. From 41, the above-described arm portion 31B extends in the axial direction. This arm portion 31B is an axially extending portion in the present embodiment, and in this embodiment, four arm portions 31B are provided at equal intervals in the circumferential direction around the rotation center portion A of the carrier 31. ing. Further, holes 42 into which the pinion shaft 12 is inserted are formed between the respective arm portions 31B in the carrier main body portion 31A, and the portion of the carrier main body portion 31A in which these holes 42 are provided is shown in FIG. The pinion seating surface 43 faces the end surface of the first pinion portion 13A of the pinion 13 shown in FIG.

  As can be seen in FIG. 4, the outer peripheral surface 43 </ b> A of the pinion seat surface 43 of the present embodiment is not an arc surface centering on the rotation center portion A of the carrier 31, and projects outward from the arc surface. The curved surface is curved. For this reason, the area of the pinion seating surface 43 is enlarged, and the pinion seating surface 43 with this enlarged area can effectively protect the first pinion portion 13A of the pinion 13 from an unexpected external force or the like. In addition, a thrust member having a large area for receiving the axial load of the pinion 13 can be arranged on the pinion seating surface 43.

  In addition, the shape of the cross section orthogonal to the rotation center portion A in each arm portion 31B is a curved shape in which the inner diameter side is recessed, and this curved shape is the total length of the arm portion 31B extending from the carrier main body portion 31A or Although it is continuous over substantially the entire length, this curved shape is not a curved shape centered on the rotation center portion A of the carrier 31, and is located between the rotation center portion A and the arm portion 31B. It has a curved shape with the center. For this reason, the radius of curvature of the arm portion 31B is smaller than the radius of curvature centered on the rotation center portion A, thereby improving the strength of the arm portion 31B with respect to the torsional torque described above. Thus, the carrier 31 itself and the power transmission component 30 have sufficient strength.

  As shown in FIG. 5, a hole 44 through which the rear wheel side output shaft 7 is inserted is formed at the center of the plate-like base member 32, and this hole in the base member 32 is formed. A hole 45 having a long hole shape that is curved in the circumferential direction is formed in a portion on the outer diameter side than 44, and this hole 45 that is a through hole is common to the carrier 31 in this embodiment. Four rotation centers A are provided at equal intervals in the circumferential direction. The distance from the rotation center A to the hole 45 is the same as the distance from the rotation center A to the arm 31B of the carrier 31 shown in FIG. 4, and as shown in FIG. Furthermore, the hole 45 has a curved shape with the same radius of curvature as the arm portion 31B shown in FIG. 4, and the circumferential length of the hole 45 is slightly shorter than the circumferential length of the arm portion 31B. Yes. Further, a hole 46 into which the pinion shaft 12 shown in FIGS. 1 and 2 is inserted is formed between the holes 45.

  As shown in FIG. 2, the tip 31C of each arm 31B of the carrier 31 is inserted into each hole 45 of the base member 32, and the tip 31C is welded to the hole 45. The carrier 31 and the base member 32 are combined and integrated, so that the carrier 31 and the base member 32 rotate around a common rotation center A.

  Thus, before the tip portion 31C is inserted into the hole 45 and the tip portion 31C is welded to the hole 45, the portion on the outer diameter side of the hole 45 with respect to the rotation center portion A is the inclined surface 51, and the rotation center portion A is related. The process which makes the part of the inner diameter side of the hole 45 the inclined surface 52 is performed. The inclination directions of the inclined surfaces 51 and 52 having an inclination angle with respect to the axial direction are directions in which the inclined surfaces 51 and 52 taper toward the insertion side of the tip portion 31 </ b> C into the hole 45. In other words, before the tip portion 31C is inserted into the hole 45 and the tip portion 31C is welded to the hole 45, the portion on the outer diameter side and the inner diameter side of the hole 45 with respect to the rotation center portion A is connected to the tip of the hole 45. Processing for forming a tapered surface tapered toward the insertion side of the portion 31C is performed, and by this processing, portions of the outer diameter side and the inner diameter side of the hole 45 become inclined surfaces 51 and 52, respectively.

  As shown in FIG. 5, the inclined surface 51 and the inclined surface 52 in the present embodiment are connected at both ends of the hole 45, and these inclined surfaces are at both ends of the hole 45. It is not necessary to be connected by the part or one edge part.

  FIG. 6 shows an operation for joining the tip portion 31C to the hole 45 by resistance welding while inserting the tip portion 31C into the hole 45 by the press device.

  In FIG. 6, the lower electrode member 105 is attached to the upper surface of the lower die 101 of the press device via the electric insulating member 103, and the base member 32 is placed on the lower electrode member 105. The inclined surfaces 51 and 52 described above are formed in the hole 45 of the base member 32 at this time. The carrier 31 is placed and set on the base member 32, and the placement set is such that the position of the tip portion 31 </ b> C of each arm portion 31 </ b> B of the carrier 31 matches the position of each hole 45 of the base member 32. Done. Further, an upper electrode member 106 is attached to the lower surface of the upper mold 102 that is movable up and down of the pressing device via an electric insulating member 104. Connection terminals 107A and 107B of an electric circuit 107 for resistance welding are connected to the lower electrode member 105 and the upper electrode member 106, and a power supply device 108 and an open / close switch 109 are disposed in the electric circuit 107.

  The resistance welding according to the present embodiment is capacitor welding with a short energization time. For this reason, the power supply device 108 is configured to include a capacitor.

  6, the drum member 9A for the differential limiting friction clutch 9 described above is not coupled to the base member 32, but this drum member 9A is coupled to the base member 32. Later, a capacitor welding operation may be performed.

  7A shows before the start of the capacitor welding operation of FIG. 6, and FIG. 7B shows the end of the capacitor welding operation of FIG. As shown in FIG. 7A, after the position of the tip portion 31C of the arm portion 31B of the carrier 31 coincides with the position of the hole 45 of the base member 32, the upper mold 102 of the press device of FIG. The switch 109 of the electric circuit 107 is closed simultaneously with the lowering or slightly before the lowering. As a result, energization is performed between the tip portion 31C of the arm portion 31B of the carrier 31 and the hole 45 of the base member 32 for a predetermined short period of time, and the tip portion 31C has a hole 45 formed by a pressure load from the upper mold 102. The tip portion 31C is inserted into the hole 45 while being guided by the inclined surfaces 51 and 52, and the tip portion 31C and the inclined surface are formed by the resistance heat generated by the energization. The parts 51 and 52 are dissolved.

  As a result, of the metal materials forming the carrier 31 and the base member 32, the metal material forming the tip portion 31C and the metal material forming the inclined surfaces 51 and 52 are melted. The portion where the penetration occurs is a penetration solidified portion 53 shown in FIG. 7B by natural cooling of the dissolved metal material. By raising the upper mold 102, the carrier 31 and the base member 32 that are coupled to each other by welding by the melted and solidified portion 53 are taken out from the press device.

  According to the present embodiment described above, the two inclined surfaces 51 and 52 are formed in the hole 45 of the base member 32 into which the tip portion 31C of the arm portion 31B of the carrier 31 is inserted. 52 is provided at the outer diameter side and the inner diameter side of the hole 45 with respect to the common rotation center portion A of the carrier 31 and the base member 32, and the two inclined surfaces 51 and 52 are formed by the tip portion 31C. Since the tapered shape is formed on the side to be inserted into the hole 45, capacitor welding is performed more than the case where the tip portion 31C and the hole 45 are joined by welding at a portion of the surface which does not have an inclination angle with respect to the axial direction. Therefore, the volume of the melt-solidified portion 53 formed by energization for the purpose can be increased. For this reason, the coupling strength by welding between the carrier 31 serving as the first member of the power transmission component 30 and the base member 32 serving as the second member shown in FIGS. On the other hand, the strength can be sufficiently increased.

  Further, the tip portion 31C welded to the hole 45 is provided for each arm portion 31B of the carrier 31, and this arm portion 31B is a circle centering on the rotation center portion A common to the carrier 31 and the base member 32. In the present embodiment, a plurality of pieces are provided in the circumferential direction, and four pieces are provided in the present embodiment, and the above-described melt-solidified portion 53 is generated at the outer diameter side and the inner diameter side of the tip portion 31C of each arm portion 31B. A large bonding strength between the base member 32 and the base member 32 can be ensured.

  Further, according to this embodiment, since the volume of the melt-solidified portion 53 is not increased by increasing the welded portion of the carrier 31 and the base member 32, the carrier 31 and the base member 32 The diameter can be reduced, in other words, the power transmission component 30 described above can be reduced in size.

  Further, according to this embodiment, the two inclined surfaces 51 and 52 are formed in a shape tapered toward the side where the tip portion 31C is inserted into the hole 45, so that the tip portion 31C is inserted into the hole 45. That is, the operation of press-fitting the tip portion 31C into the hole 45 by the pressurizing load of the press device can be performed by a small press machine having a small pressurizing capacity.

  Further, according to this embodiment, the two inclined surfaces 51 and 52 are formed in a shape that is tapered toward the side where the tip portion 31C is inserted into the hole 45, so that the tip portion 31C is inserted into the hole 45. In doing so, the inclined portions 51 and 52 can automatically position the tip portion 31C with respect to the hole 45, so that the tip portion 31C can be reliably inserted into the hole 45.

  8 and 9 show an embodiment in which a stop portion 54 for setting the insertion depth of the tip portion 31C of the arm portion 31B of the carrier 31 is provided in the hole 45 of the base member 32. FIG. That is, the end portions on the insertion side of the tip portion 31C into the hole 45 in the two inclined surfaces 51 and 52 have a length in the radial direction with the rotation center portion A as the center, A stop portion 54 for stopping the insertion of the portion 31C is formed.

  According to this embodiment, when the upper mold 102 is lowered, the tip portion 31C is inserted into the hole 45 while being guided by the two inclined surfaces 51 and 52, and the tip end surface 31D of the tip portion 31C is inserted. By coming into contact with the stop portion 54, it stops automatically.

  For this reason, according to this embodiment, the same effect as that of the embodiment of FIGS. 6 and 7 can be obtained, and the tip surface 31D of the tip portion 31C abuts against the stop portion 54, so that the tip portion 31C can be further increased. Can be stopped from being inserted into the hole 45, the insertion depth of the tip 31 </ b> C into the hole 45 can be accurately set by the stop part 54.

  10 and 11 show an embodiment in which two inclined surfaces 61 and 62 having an inclination angle with respect to the axial direction are provided on the tip 31C of the arm 31B of the carrier 31. FIG. That is, inclined surfaces 61 and 62 are formed on the outer diameter side and the inner diameter side of the tip portion 31C of the arm portion 31B of the carrier 31 with respect to the rotation center portion A, and these inclined surfaces 61 and 62 are formed as holes. 45 is tapered toward the insertion side of the tip portion 31C.

  In this embodiment, when the upper mold 102 is lowered, the tip portion 31C is inserted into the hole 45 while being guided by the two inclined surfaces 61 and 62 formed in the tip portion 31C. According to this embodiment, the same effect as that of the embodiment of FIGS. 6 and 7 can be obtained.

  12 and 13 show an embodiment in which two inclined surfaces 71 and 72 having an inclination angle with respect to the axial direction are divided into a tip portion 31C of the arm portion 31B of the carrier 31 and a hole 45 of the base member 32. Is shown.

  That is, a first inclined surface 71 is provided on the tip portion 31C of the arm portion 31B of the carrier 31, and the first inclined surface 71 is formed on the outer diameter side portion of the tip portion 31C with respect to the rotation center portion A. A second inclined surface 72 is provided in the hole 45 of the base member 32, and the second inclined surface 72 is formed at a portion of the hole 45 on the inner diameter side with respect to the rotation center portion A.

  In this embodiment, as shown in FIGS. 12 and 13, the surface 32 </ b> A on the side facing the carrier 31 in the base member 32 is a flat surface on which the one protruding toward the carrier 31 is not formed. Can be applied particularly effectively.

  Even in this embodiment, when the upper mold 102 is lowered, the two inclined surfaces 71 and 72 are tapered toward the insertion side of the tip portion 31C into the hole 45. It is inserted into the hole 45 while being guided by the surfaces 71 and 72. And also by this embodiment, the same effect as the effect by embodiment of FIG.6 and FIG.7 is acquired.

  In particular, according to this embodiment, the operation of forming the two inclined surfaces 71 and 72 can be easily performed.

  That is, when two inclined surfaces are provided at the tip 31C of the arm portion 31B of the carrier 31, an inclined surface must also be formed on the inner diameter side portion of the tip 31C. Since the space on the inner diameter side is smaller than the inner diameter side, it is difficult to form an inclined surface in the inner diameter side portion of the tip portion 31C, or much labor and a long time are required.

  However, as described above, when the surface 32A facing the carrier 31 of the base member 32 is a flat surface that is not formed to protrude toward the carrier 31, the arm portion 31B of the carrier 31 is provided. By forming the inclined surface instead of the inclined surface in the inner diameter side portion of the tip portion 31C of the base portion 32C as the second inclined surface 72 in the inner diameter side portion of the hole 45 of the base member 32, Since the surface 32A facing the carrier 31 in the member 32 is the above-described flat surface, the operation of forming the second inclined surface 72 in the inner diameter side portion of the hole 45 of the base member 32 is, for example, a vertical type. It can be easily performed by using a processing machine such as a milling machine. Since the space on the outer diameter side of the tip portion 31C of the arm portion 31B of the carrier 31 is a space that is wide open toward the outside, the outer diameter side of the tip portion 31C of the arm portion 31B of the carrier 31 The operation of forming the first inclined surface 71 in the portion can be easily performed by using, for example, a processing machine such as a grinding machine for performing outer peripheral surface grinding.

  Therefore, according to this embodiment, the operation | work which forms the two inclined surfaces 71 and 72 can be performed easily.

  In the embodiment of FIGS. 6 and 7 in which the two inclined surfaces 51 and 52 are provided in the hole 45 of the base member 32, these inclined surfaces 51 and 52 are used as a processing machine such as a vertical milling machine, for example. By using this, it is possible to process the holes 45 simultaneously.

  The present invention can be used for components arranged in a power transmission path for transmitting rotational power, and includes, for example, a differential device such as a center differential device for uneven distribution of front and rear wheel torque of a four-wheel drive vehicle. It can be used for parts for various power transmission devices.

FIG. 1 shows a power transmission path in which power transmission components according to an embodiment of the present invention are arranged, and a center differential device for unevenly distributing torque to front and rear wheels of a four-wheel drive vehicle is arranged. It is a skeleton figure which shows a power transmission path | route. FIG. 2 is a side sectional view of the power transmission component according to the present embodiment shown in FIG. FIG. 3 is a perspective view of the carrier serving as the first member among the members constituting the power transmission component. FIG. 4 is a front view of the carrier. FIG. 5 is a front view of the base member serving as the second member among the members constituting the power transmission component. FIG. 6 is a cross-sectional view showing an operation for joining the tip portion to the hole by resistance welding while inserting the tip portion of the arm portion which is the axially extending portion of the carrier into the hole of the base member by the press device. FIG. FIG. 7A is an enlarged view of the main part showing before the start of the resistance welding work of FIG. 6, and FIG. 7B is an enlarged view of the main part showing the end of the resistance welding work of FIG. is there. FIG. 8 is a view similar to FIG. 6 showing an embodiment in which a stop portion is provided in the hole of the base member. 9A and 9B are views similar to FIGS. 7A and 7B in the embodiment of FIG. FIG. 10 is a view similar to FIG. 6 showing an embodiment in which two inclined surfaces are provided at the tip of the arm portion of the carrier. 11A and 11B are views similar to FIGS. 7A and 7B in the embodiment of FIG. FIG. 12 is a view similar to FIG. 6 showing an embodiment in which two inclined surfaces are provided separately for the tip of the arm portion of the carrier and the hole of the base member. FIGS. 13A and 13B are views similar to FIGS. 7A and 7B in the embodiment of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 30 Power transmission component 31 Carrier 31B which is 1st member Arm part 31C which is an axial direction extension part 31C Front part 31D Front end surface 32 Base member which is 2nd member 32A Surface on the side facing a carrier in a base member 45 Hole 51, 52 inclined surface 53 melted and solidified portion 54 stop portions 61, 62 inclined surface 71 first inclined surface 72 second inclined surface A rotation center portion

Claims (11)

A component disposed in a power transmission path through which rotational power is transmitted,
An axial direction that includes a first member and a second member that rotate about a common center of rotation, and extends in the axial direction at a position that is radially away from the center of rotation of the first member. In the power transmission component in which the extension portion is formed, the tip portion of the axial extension portion is inserted into the hole formed in the second member, and the tip portion is welded to the hole,
In one of the hole and the tip portion, two inclined surfaces are formed in a tapered shape toward the insertion side at the outer diameter side and the inner diameter side with respect to the rotation center portion. A power transmission component, wherein the tip portion is welded to the hole by resistance welding at a portion of the inclined surface.   2. The power transmission component according to claim 1, wherein the portion where the two inclined surfaces are formed is a portion between the outer diameter side and the inner diameter side of the hole.   3. The power transmission component according to claim 2, wherein end portions on the insertion side of the two inclined surfaces in the hole have a length in a radial direction centered on the rotation center portion, and the tip. A power transmission component having a stop portion for stopping insertion of the portion.   2. The power transmission component according to claim 1, wherein the portion where the two inclined surfaces are formed is a portion between the outer diameter side and the inner diameter side of the tip portion. 3. . A component disposed in a power transmission path through which rotational power is transmitted,
An axial direction that includes a first member and a second member that rotate about a common center of rotation, and extends in the axial direction at a position that is radially away from the center of rotation of the first member. In the power transmission component in which the extension portion is formed, the tip portion of the axial extension portion is inserted into the hole formed in the second member, and the tip portion is welded to the hole,
One of the hole and the tip is formed with a first inclined surface at one of the outer diameter side and the inner diameter side with respect to the center of rotation, and the hole and the tip. The second inclined surface is formed in the other of the outer diameter side and the inner diameter side with respect to the rotation center portion, and the other of the portions is tapered toward the insertion side. A power transmission component, wherein the tip portion is welded to the hole by resistance welding at a portion of the first and second inclined surfaces.   6. The power transmission component according to claim 5, wherein a surface of the second member in which the hole is formed facing the first member is not formed to protrude toward the first member. It is a flat surface, and the first inclined surface is formed in an outer diameter side portion of the tip portion, and the second inclined surface is formed in an inner diameter side portion of the hole. Power transmission parts to do.   The power transmission component according to claim 1, wherein a plurality of the axially extending portions are provided in a circumferential direction around the rotation center portion.   The power transmission component according to any one of claims 1 to 7, wherein the first member is a carrier for a planetary gear mechanism disposed in a power transmission path for transmitting a traveling power of a vehicle. Power transmission parts to do.   The power transmission component according to claim 8, wherein the planetary gear mechanism constitutes a differential device in the vehicle. A method of manufacturing a component disposed in a power transmission path through which rotational power is transmitted,
An axial direction that includes a first member and a second member that rotate about a common center of rotation, and extends in the axial direction at a position that is radially away from the center of rotation of the first member. Manufacturing of a power transmission component in which an extension portion is formed, a tip portion of the axial extension portion is inserted into a hole formed in the second member, and the tip portion is welded to the hole In the method
A step of forming two inclined surfaces in a tapered shape toward the insertion side at one of the hole and the tip portion at the outer diameter side and the inner diameter side with respect to the rotation center portion;
Welding the tip portion to the hole by resistance welding at a portion of the two inclined surfaces while inserting the tip portion into the hole;
The manufacturing method of the power transmission component characterized by including. A method of manufacturing a component disposed in a power transmission path through which rotational power is transmitted,
An axial direction that includes a first member and a second member that rotate about a common center of rotation, and extends in the axial direction at a position that is radially away from the center of rotation of the first member. Manufacturing of a power transmission component in which an extension portion is formed, a tip portion of the axial extension portion is inserted into a hole formed in the second member, and the tip portion is welded to the hole In the method
A first inclined surface is formed in one of the outer diameter side and the inner diameter side of the rotation center portion in one of the hole and the tip portion, and the hole and the tip portion A step of forming a second inclined surface on the other of the outer diameter side and the inner diameter side of the rotation center portion,
Welding the tip to the hole by resistance welding at a portion of the first and second inclined surfaces that are tapered toward the insertion side while inserting the tip into the hole;
A method of manufacturing a power transmission component, comprising:

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