JP2008209010A - Power transmission component - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a power transmission component capable of more increasing strength against the torsion torque. <P>SOLUTION: The power transmission component for a planetary gear mechanism of a vehicular center differential device for distributing uneven torque includes a carrier 2. A carrier main body 2A as a first portion is coupled to a base member as a second portion by an arm portion 2B of the carrier 2 as a coupling portion. Shape of the arm portion 2 is formed into a curved shape extending from a central part B in the circumferential direction of the arm portion 2B to both sides in the circumferential direction, changing inward in the radial direction and coming close to the center of rotation A. With this structure, the max cross sectional coefficient of the arm portion 2B is large, and the arm portion 2B has a large strength to large torsion torque to be applied to the power transmission component due to uneven distribution of the torque to front and rear wheels. The peripheral part of a pinion seat surface 27 and the peripheral part of the arm portion 2B are coupled to each other without existence of a concave between both the peripheral parts. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a component arranged in a power transmission path for transmitting power, and can be applied to, for example, a center differential device for uneven distribution of front and rear wheel torque of a four-wheel drive vehicle.

  A center differential device for unequally distributing torque to front and rear wheels of a four-wheel drive vehicle is disclosed in Patent Document 1 below.

  FIG. 9 shows a power transmission path in which such an unequal torque distribution center differential device is used. The power generated in the engine 71 is output from the speed change output shaft 74 of the speed change mechanism 73 via the torque converter 72, and the power from the speed change output shaft 74 is connected to the front wheel side output shaft 76 and the rear wheel via the center differential device 75. Is output to the side output shaft 77. The center differential device 75 includes a combination of a compound planetary gear mechanism 78 and a differential limiting friction clutch 79.

  The compound planetary gear mechanism 78 has a carrier 82 in which a gear 81 meshing with a gear 80 of the front wheel side output shaft 76 is attached to a carrier body 82A, and a tip of an arm portion 82B having a length in the axial direction of the carrier 82. A base member 83 coupled to and integrated with the drum member 79A of the clutch 79, a pinion shaft 84 installed on the carrier main body 82A and the base member 83, and a free engagement with the pinion shaft 84 The pinion 85 includes a first pinion portion 85A and a second pinion portion 85B. The first pinion portion 85A meshes with the sun gear 86 of the transmission output shaft 74, and the second pinion portion 85B meshes with the sun gear 87 of the rear wheel side output shaft 77.

  When the power from the speed change output shaft 74 is input to the compound planetary gear mechanism 78, the power is output from the front wheel side output shaft 76 and the rear wheel by the rotation of the carrier 82 around the speed change output shaft 74 and the revolution and rotation of the pinion 85. Is transmitted to the side output shaft 77. Further, when a large rotational speed difference due to slip or the like occurs between the front wheels and the rear wheels, a piston (not shown) of the clutch 79 is controlled by a hydraulic device controlled by a control device that receives a signal from a sensor that detects this. Generation of a large rotational speed difference between the front and rear wheels is prevented by the frictional force of the clutch 79 that moves in the axial direction.

  Further, the torque distribution from the speed change output shaft 74 to the front wheels and the rear wheels through the compound planetary gear mechanism 78 is determined by the teeth of the first pinion portion 85A, the second pinion portion 85B, the sun gear 86, and the sun gear 87. For example, the front wheels are unequally distributed to 45% and the rear wheels to 55% because of the number relationship.

  10 is a side sectional view showing a specific structure of the carrier 82, base member 83, and drum member 79A in FIG. 9, and FIG. 11 is a sectional view taken along line S11-S11 in FIG. As can be seen from FIG. 11, the carrier body 82A that is rotatable about the speed change output shaft 74 has three arm portions 82B at equal intervals in the circumferential direction around the center of rotation of the carrier body 82A. As shown in FIG. 10, the tip of each arm portion 82B is welded to a base member 83 that is rotatable about a rear wheel side output shaft 77, and this base member 83 is a clutch. 79 drum members 79A.

  Holes 88 and 89 for inserting the pinion shaft 84 are formed in the carrier main body 82A and the base member 83, and the pinion 85 is rotatably arranged on the pinion shaft 84.

  As described above, when the torque transmitted from the transmission output shaft 74 is unevenly distributed to the front and rear wheels by the compound planetary gear mechanism 78, the torque output position to the front wheel side and the torque output position to the rear wheel side are in the axial direction. Therefore, the carrier 82 including the base member 83, that is, the power transmission component for the compound planetary gear mechanism 78 receives the torsional torque according to the difference in unequal torque.

  Further, for example, when the vehicle is stopped and the front and rear wheels are locked by the depression of the brake pedal, and when the amplified torque (stall torque) is generated by the torque converter 72 by the sudden depression of the accelerator pedal, the base member 83 is also provided. The torsional torque based on this amplified torque acts on the carrier 82 including.

  Such torsional torque is used to connect the carrier body 82A, which is the first part of the power transmission component, and the base member 83, which is the second part of the power transmission component, away from the carrier body 82A in the axial direction. It is supported by the strength of the arm part 82B which is the connecting part.

Conventionally, as shown in FIG. 11, each arm portion 82 </ b> B has a plate shape extending in the circumferential direction, and an arc shape centering on the rotation center portion of the carrier body 82 </ b> A and the base member 83. It was.
JP-A-3-61122 (FIGS. 1, 2, and 3)

  In recent years, engine output and vehicle running performance have been improved. For this reason, the strength against the torsional torque of the carrier including the base member, in other words, the strength against the torsional torque of the power transmission component is further increased, so that the power transmission component can be used even in a power transmission path in which a large torsion torque is generated. Is required.

  An object of the present invention is to provide a power transmission component that can further increase the strength against torsional torque and a method for manufacturing the same.

  A plurality of power transmission components according to the present invention are provided in a circumferential direction centering on a first portion and a second portion that rotate apart and rotate in the axial direction, and a rotation center portion of the first portion and the second portion. And a power transmission component that has a coupling portion that couples the first portion and the second portion, and that is disposed in a power transmission path and receives a torsional torque, wherein the shape of the coupling portion is in the circumferential direction. As it extends, the distance from the center of rotation changes.

  According to this power transmission component, the shape of the connecting portion that connects the first portion and the second portion becomes a shape in which the distance from the rotation center portion of the first portion and the second portion changes as it extends in the circumferential direction. Therefore, the pole section coefficient that works more effectively with respect to the torsional torque becomes larger than in the prior art in which the first part and the second part have arcuate shapes around the rotation center. Thereby, the strength of the connecting portion with respect to the torsion torque can be increased as compared with the conventional case, and a large torsion torque can be received.

  The shape of the connecting portion that connects the first portion and the second portion is a shape in which the distance from the rotation center portion of the first portion and the second portion changes as it extends in the circumferential direction. realizable. Below are four of them.

  The 1st form is making a connection part into plate shape, and making this connection part into the curved shape curved in the radial direction of the said rotation center part. In this embodiment, the curved shape may be a shape in which the inner diameter side is recessed or a shape in which the outer diameter side is recessed.

  In the second embodiment, the outer diameter side surface of the coupling portion is an arc surface centered on the rotation center portion, and the inner diameter side surface is a surface that moves to the inner diameter side as it extends in the circumferential direction. That is.

  In the third mode, the surface on the inner diameter side of the connecting portion is an arc surface centered on the rotation center portion, and the surface on the outer diameter side transitions to the outer diameter side as it extends in the circumferential direction; It is to be.

  In the fourth embodiment, the outer diameter side surface of the connecting portion is changed to the outer diameter direction as it extends in the circumferential direction, and the inner diameter side surface is changed to the inner diameter side as it extends in the circumferential direction. It is to make it a surface to do.

  The power transmission component according to the present invention can be manufactured as an arbitrary product such as a sheet metal press-formed product, a cast product, a forged product, and a sintered metal product. And when making a connection part into the 1st form, it is preferable to make a power transmission component into the press-molded product of sheet metal.

  Further, the power transmission component may be manufactured as one member in which the first portion, the second portion, and the connecting portion are integrally formed, or one of the first portion, the second portion, and the connecting portion. You may manufacture a power transmission component by combining the member in which one or two were integrally formed, and one or two members in which the remainder was formed.

  Among these, when a part of the power transmission component is a sheet metal press-molded product, the first part and the connecting portion are integrally formed as a sheet metal press-molded product, and the second part is the press-molded product. A power transmission component can be manufactured by forming a molded product different from the product and joining the tip of the connecting portion to the other molded product.

  The power transmission component according to the present invention can be applied to configure a power transmission path in an arbitrary transportation means such as a vehicle, a ship, and an aircraft, a work machine, a machine tool, and the like.

  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 power transmission for transmitting the traveling power of the vehicle to the first portion and the connecting portion. It can be the part forming the carrier for the 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, may constitute a front wheel differential device, or may constitute a rear wheel differential device. 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.

  The manufacturing method of the power transmission component according to the present invention includes a first part and a second part that are separated and rotated in the axial direction, and a plurality of circumferentially centered rotation centers of the first part and the second part. A method for manufacturing a power transmission component that is provided individually and has a coupling portion that couples the first part and the second part, and that is disposed in a power transmission path and receives a torsional torque. A first step for obtaining a punched article having a portion to be the first portion and an outer portion outside the portion by the punching process, and also having a portion to be the connecting portion; The outer portion and the portion to be the connecting portion are bent with respect to the portion to be the first portion of the punched product, and the portion to be the connecting portion is bent by the bending of the portion to be the connecting portion. With the connecting part A second step for forming the connecting portion in a shape in which the distance from the rotation center portion changes as it extends in the circumferential direction, a third step for cutting the outer portion, and the connecting portion. And a fourth step for joining the tip of the second portion to a second part member which is manufactured in advance and has the second part.

  According to this method for manufacturing a power transmission component, the first portion and the connecting portion can be easily formed by press working such as sheet metal punching, bending, drawing, etc., and therefore can be mass-produced at low cost. Further, when performing a series of press forming operations such as punching and bending, the operation for forming the connecting portion into a shape in which the distance from the rotation center portion changes as it extends in the circumferential direction is performed. Can be done simultaneously as part of the press forming operation.

  Further, according to the method for manufacturing the power transmission component, when the portion to be the connecting portion is bent with respect to the portion to be the first portion, the outer portion provided outside the first portion is also bent, Since the portion is cut away, a concave portion or the like that is likely to generate concentrated stress during power transmission is not formed in the vicinity of the connection portion between the first portion and the coupling portion, thereby increasing the torque that can be transmitted.

  In this method of manufacturing a power transmission component, when the power transmission component is a component for a planetary gear mechanism having a pinion, the work for cutting the outer portion in the third step is the portion to be the first portion. The base part of the outer part that is connected to the pinion is left, and this base part is pressed before the work of the fourth step, and the pinion seat that faces the pinion accurately by this press process A surface may be formed.

  Further, in the method of manufacturing a power transmission component, in the second step, the operation of forming the connecting portion in a shape in which the distance from the rotation center portion changes as it extends in the circumferential direction, It may be an operation of forming a curved shape that is curved in the radial direction of the rotation center and having a concave inner diameter side, or an operation of forming a concave shape on the outer diameter side.

  However, in the second step, the operation of forming the connecting portion into a shape in which the distance from the rotation center portion changes as it extends in the circumferential direction is performed by bending the connection portion in the radial direction of the rotation center portion. In the case where the inner diameter side is formed into a curved shape that is depressed, the outer portion and the portion to be the connecting portion are bent with respect to the portion to be the first portion, and the portion to be the connecting portion is When working with this part as a connecting part by this bending, the connecting part can be easily and surely shaped into the above shape by a preferred form in terms of press molding, in which the part to be the connecting part is curved and deformed in the inner diameter direction. Can be formed.

  According to the present invention, it is possible to obtain an effect that the strength of the power transmission component against torsional torque can be further increased.

  EMBODIMENT OF THE INVENTION Below, the form for implementing this invention is demonstrated based on drawing. FIG. 1 is a side sectional view of the power transmission component 1 according to the present embodiment, and FIG. 2 is a sectional view taken along line S2-S2 of FIG. The power transmission component 1 includes a center differential device 75 for unequal distribution of torque to the front and rear wheels of the four-wheel drive vehicle shown in FIG. 9, as in the conventional power transmission component described in FIGS. 10 and 11. It constitutes.

  The power transmission component 1 includes a carrier 2, a base member 3, and a drum 4 member. The carrier 2 and the base member 3 are members for the compound planetary gear mechanism 78 of the center differential device 75 of FIG. 9, and the drum member 4 is a member for the differential limiting friction clutch 79.

  The carrier 2 is a sheet metal press-formed product, and the base member 3 and the drum member 4 are also sheet metal press-formed products. However, the base member 3 and the drum member 4 may be cast products, forged products, or the like.

  As shown in FIG. 1, the carrier 2 includes a carrier body 2A and an arm portion 2B extending in the axial direction from the outer periphery of the carrier body 2A. The arm portion 2B is as shown in FIG. In addition, a plurality, four in this embodiment, are provided at equal intervals in the circumferential direction around the rotation center A of the carrier body 2A. A hole 5 through which the transmission output shaft 74 shown in FIG. 9 is inserted is opened in the carrier body 2A, and the pinion shown in FIG. A hole 6 into which the shaft 84 is inserted is formed. As shown in FIG. 2, there are a total of four holes 6 in each of the intermediate portions of the two arm portions 2B, and a total of four pinions 85 shown in FIG. ing.

  Since the carrier 2 is manufactured by press molding of sheet metal, each arm portion 2B has a plate shape. Further, as can be seen from FIG. 2, each arm portion 2B has a curved shape curved toward the inner diameter side of the carrier body 2A, and the central portion of the curved shape which is an arc shape is the rotation of the carrier body 2A. Each of the arm portions 2B, not the center portion A, has a shape that gradually moves to the inner diameter side and approaches the rotation center portion A as it extends from the circumferential center portion B of the arm portion 2B to both sides in the circumferential direction. . In other words, the arc center portion C of each arm portion 2B having an arc shape with a recessed inner diameter side is located on the outer diameter side of the rotation center portion A of the carrier body 2A.

  As described above, the shape of the arm 2B is curved in the radial direction of the rotation center A, and the distance from the rotation center A of the carrier body 2A changes as it extends in the circumferential direction. Compared with the case where the distance does not change, the polar section coefficient of the rotation center portion A is increased.

  FIG. 3 shows a perspective view of the overall shape of the carrier 2 described above.

  As shown in FIG. 1, a hole 7 through which the rear wheel side output shaft 77 shown in FIG. 9 is inserted is formed at the center of the base member 3, and a pinion shaft is formed on the outer peripheral side of the hole 7. Four holes 8 into which 84 are inserted are formed at equal intervals in the circumferential direction. In addition, a long hole 9 having a circular arc shape in the circumferential direction is formed at a position slightly outside the intermediate portion of the two holes 8, and the long holes 9 are also arranged at regular intervals in the circumferential direction. It is provided.

  Both ends of a pinion shaft 84 having a pinion 85 rotatably fitted on the outer periphery thereof are inserted into the hole 6 of the carrier body 2A and the hole 8 of the base member 3, and then the elongated holes 9 of the base member 3 are respectively inserted. By inserting the tips of the arm portions 2B and welding the tips and the base member 3, the carrier 2 and the base member 3 are combined and integrated.

  After the carrier 2 and the base member 3 are coupled in this way, the drum member 4 may be coupled to the base member 3 by welding, and the drum member 4 is coupled to the base member 3 before being coupled to the carrier 2. Also good.

  The power transmission component 1 configured as described above is incorporated as a component for the center differential device 75 in the power transmission path of FIG. When the power from the speed change output shaft 74 is input to the center differential device 75 and further this power is transmitted to the front wheel side output shaft 76 and the rear wheel side output shaft 77 as unequal distribution torque, as described above, the power The transmission component 1 receives a torsional torque in the circumferential direction. Also, when the amplified torque is generated by the torque converter 72, the power transmission component 1 receives a torsion torque based on the amplified torque.

  These torsional torques are arm portions 2B serving as connecting portions that connect the carrier body 2A of the carrier 2 that is the first portion of the power transmission component 1 and the base member 3 that is the second portion of the power transmission component 1. However, as described above, the pole section coefficient of the arm portion 2B is large. This pole section coefficient represents the characteristics of the shape of the carrier 2 that can counter the torsion torque. Since the pole section coefficient is increased, the power transmission component 1 according to this embodiment has a greater strength against the torsion torque than in the past. And can be arranged in a power transmission path in which a large torsional torque is generated.

  In addition, the carrier 2 of the power transmission component 1 does not increase the pole section coefficient of the arm portion 2B by using a sheet metal having a large plate thickness. Since the carrier 2 is not so heavy and reduced in weight, it can contribute to reducing the weight of the vehicle body required for the vehicle in order to improve fuel consumption.

  In addition, since the arm portion 2B is not formed by increasing the length in the circumferential direction to increase the polar section modulus, it is possible to secure a space where the pinion 85 can be disposed between the two arm portions 2B.

  In addition, since each arm portion 2B has a curved shape in which the inner diameter side is recessed, the diametric dimension of the carrier 2 can be reduced compared to a case in which the outer diameter side is recessed, and the carrier 2 is The carrier 2 can be effectively arranged in a limited space in the power transmission path.

  Next, an operation of manufacturing the carrier 2 by sheet metal press molding will be described. FIGS. 4 to 7 are diagrams showing the manufacturing operations according to the order. Among these drawings, FIGS. 5 to 7 showing a state after folding are shown in FIG. It is a sectional side view along the -D line.

  First, a punched product 20 shown in FIG. 4 is produced by punching a sheet metal. The punched product 20 includes a portion 21 to be the carrier body 2A, an outer portion 22 outside the portion 21, and a portion 23 to be the arm portion 2B. There are a total of four outer portions 22 connected to these portions 23 between the portions 23 to be the four arm portions 2B. Next, a process of bending the outer part 22 and the part 23 to be the arm part 2B with respect to the part 21 to be the carrier body 2A, in other words, the outer part 22 and the arm to the part 21 to be the carrier body 2A. By performing the process of narrowing the portion 23 to be the portion 2B, the bent product 25 shown in FIG. 5 is produced, and the portion 23 to be the arm portion 2B is defined as the arm portion 2B.

  When the bent product 25 is produced, the portion 23 to be the arm portion 2B has a shape curved toward the inner diameter side, and an arc shape centering on the center portion C located on the outer diameter side from the rotation center portion A. To form a curve. This processing operation can be performed by drawing with the shape of a press die arranged inside and outside the bent product 25.

  Thereafter, as shown in FIG. 6, an operation of excising the outer portion 22 is performed. In this operation, the outer portion 22 is not cut away from the connection portion 26 (see FIG. 4) between the portion 21 to be the carrier body 2A and the outer portion 22, but is connected to the portion 21 to be the carrier body 2A. This is done leaving the base portion 22A (see FIG. 5) of the outer portion 22 that is in contact. As a result, the processed product 30 shown in FIG. 6 is produced. In this way, the operation of cutting the outer portion 22 while leaving the base portion 22A can be performed by placing a cam-driven punching die inside the bent product 25 and punching with the punching die.

  Next, the portion 21 to be the carrier body 2A of the processed product 30 is pressed including the base portion 22A of the outer portion 22, and the processed product 35 of FIG. 7 is produced by this pressing. In this processed product 35, the portion 21 to be the carrier body 2 </ b> A is the carrier body 2 </ b> A, and the base portion 22 </ b> A is pressed, whereby the carrier body 2 </ b> A faces the pinion 85. (See also FIGS. 2 and 3) is formed accurately.

  Next, a predetermined operation such as punching or other processing for forming the holes 5, 6 and the like in the carrier body 2A is performed. This predetermined work may be performed as a work before punching the sheet metal to obtain the punched product 20 of FIG. 4, or may be performed simultaneously with the processing of FIGS.

  The carrier 2 is obtained by the above operation steps, and the tip of the arm portion 2B of the carrier 2 is welded to the base member 3 shown in FIG. Join.

  According to the above carrier manufacturing method, the carrier 2 can be produced in a large amount at a lower cost than the press molding of sheet metal, and the curved arm portion 2B whose distance from the rotation center portion A gradually changes as it extends in the circumferential direction. Since the forming operation can be performed simultaneously as a part of a series of press forming operations including punching and bending, the operation cost can be reduced.

  Further, since the arm portion 2B has a curved shape in which the inner diameter side is recessed, the machining operation for obtaining this curved shape is performed on the outer portion 22 and the portion to be the arm portion 2B with respect to the portion 21 to be the carrier body 2A. 23, the portion to be the arm portion 2B can be bent and deformed in the inner diameter direction in a preferable form in terms of press molding, and the arm portion 2B having the predetermined shape can be easily formed. And it can be formed reliably.

  In particular, in this carrier manufacturing method, when the punched product 20 is produced, the punched product 20 including the outer portion 22 of the portion 21 to be the carrier body 2A is produced, and the portion 21 to be the carrier body 2A is produced. On the other hand, when the portion 23 to be the arm portion 2B is bent, the outer portion 22 is also bent, and the outer portion 22 is cut out in a post-operation process. In general, when the arm portion 82B shown in FIG. 11 is bent with respect to the carrier main body 82A, a concave portion 90 is formed in the vicinity of the connecting portion between the arm portion 82B and the carrier main body 82A in order to facilitate the bending. However, according to the carrier manufacturing method according to this embodiment, it is possible to produce the carrier 2 that is not provided with such a concave portion 90 that is likely to cause stress concentration during power transmission. Such a power transmission component 1 can be used in a power transmission path in which a large torsion torque is generated.

  Further, in this carrier manufacturing method, when the operation of cutting the outer portion 22 is performed, the outer portion 22 is not cut from the connection portion 26 between the portion 21 and the outer portion 22 to be the carrier main body 2A, but the carrier main body 2A. In order to cut the outer portion 22 while leaving the base portion 22A of the outer portion 22 connected to the portion 21 to be formed, and press the base portion 22A in a post-operation process, the carrier body 2A is provided with a pinion 85 and The pinion seating surface 27 that is a flat surface facing each other at an accurate interval can be formed.

  The carrier 2 of the power transmission component 1 described above is a carrier for the compound planetary gear mechanism 78 in which the pinion 85 having the first pinion portion 85A and the second pinion portion 85B is used, but is shown in FIG. The power transmission component carrier 52 according to another embodiment is a carrier for the simple planetary gear mechanism 48.

  The center differential device by the carrier input type simple planetary gear mechanism 48 shown in FIG. A ring gear 55 connected to the rear wheel side output shaft 54, a carrier 52 supporting one end of a pinion shaft 56 with which the pinion 53 is rotatably fitted by a carrier body 52A, and a carrier 52 The tip of the arm portion 52B is coupled to the rotary member 57 that supports the other end of the pinion shaft 56, and the rotary member 57 is rotatably supported by the rear wheel side output shaft 54. The power is input from the carrier 52 to the simple planetary gear mechanism 48, and this power is transmitted from the ring gear 55 to the rear wheel side output shaft 54 and to the front wheel side output shaft 50 via the sun gear 51.

  In this embodiment, the carrier body 52A is connected to the first portion of the power transmission component, the rotating member 57 is connected to the second portion of the power transmission component, and the arm portion 52B of the carrier 52 connects the first portion and the second portion. Each is a connecting part.

  At the time of power transmission to the front and rear wheels, the torsional torque according to the axial offset amount between the meshing position of the pinion 53 and the ring gear 55 and the arrangement position of the carrier body 52A which is the torque input position is the carrier 52 and the rotating member. It acts on the power transmission component composed of 57. Even if this torsional torque is large, the shape of the arm portion 52B is shown in the shape in which the distance from the center of rotation of the carrier 52 and the rotating member 56 changes as the arm portion 52B extends in the circumferential direction, for example, FIG. By using the same shape as the arm portion 2B, the arm portion 52B has a strength capable of resisting a large torsional torque.

  INDUSTRIAL APPLICABILITY The present invention is a component for a device including a center differential device for unequal front and rear wheel torque distribution of a four-wheel drive vehicle, for example, and can be used for a component disposed in a power transmission path for transmitting power. Is.

FIG. 1 is a side sectional view showing a power transmission component according to an embodiment of the present invention. 2 is a cross-sectional view taken along line S2-S2 of FIG. FIG. 3 is a perspective view showing the entire carrier. FIG. 4 is a plan view showing a punched product obtained by punching a sheet metal, which is the first of the operations for manufacturing a carrier that is a press-formed product of a sheet metal. FIG. 5 is a side cross-sectional view taken along line DD of FIG. 4 showing a bent product obtained by bending the punched product of FIG. 6 is a side cross-sectional view taken along the line DD of FIG. 4 showing a processed product obtained by cutting off a part of the bent product of FIG. FIG. 7 is a side cross-sectional view taken along the line DD of FIG. 4 showing a processed product obtained by pressing the processed product of FIG. FIG. 8 is a skeleton diagram showing an embodiment in which the power transmission component is a component for a simple planetary gear mechanism. FIG. 9 is a skeleton diagram showing a power transmission path in which a center differential device for unevenly distributing torque to the front and rear wheels of a four-wheel drive vehicle is arranged. FIG. 10 is a diagram showing a conventional example, and is a side sectional view showing a specific structure of a carrier, a base member, and a drum member constituting the power transmission component in FIG. 11 is a cross-sectional view taken along line S11-S11 in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Power transmission component 2,52 Carrier 2A, 52A Carrier main body 2B, 52B which is 1st part of power transmission component Arm part which is connection part 3 Base member which is 2nd part of power transmission component 4 Drum member 20 Punched product 21 Part to be the carrier body 22 Outer part 22A Base part 23 Part to be the arm part 25 Folded product 27 Pinion seat surface 48 Simple planetary gear mechanism 53, 85 Pinion 57 Rotating member which is the second part of the power transmission part 75 Four wheels Center differential device for unequal torque distribution of drive vehicle 78 Compound planetary gear mechanism 79 Friction clutch for differential limitation A Rotation center C Cylinder arc center of arc

Claims (3)

A plurality of first and second portions that are separated from each other in the axial direction and rotate, and a plurality of circumferential portions centering on the rotation center portions of the first and second portions are provided, and the first and second portions are provided. A power transmission component having a coupling portion that couples the parts and receiving torsional torque disposed in the power transmission path;
It is a part for a planetary gear mechanism with a pinion,
The first part and the connecting part form a carrier for the planetary gear mechanism disposed in a power transmission path that transmits the driving power of the vehicle,
Each of the connecting portions extends in the axial direction from the outer peripheral portion of the first portion, and the shape of these connecting portions, which are plate-shaped, extends from the rotation center portion as they extend in the circumferential direction. Is a shape where the distance changes, and is a curved shape in which the inner diameter side is recessed in the radial direction of the rotation center portion,
Between each said connection part in the said 1st part, it is the pinion seating surface which faces the said pinion,
The power transmission component, wherein the outer peripheral portion of the pinion seat surface and the outer peripheral portion of the connecting portion are connected to each other without any concave portion between the outer peripheral portions.   2. The power transmission component according to claim 1, wherein a shape of an outer peripheral portion of the pinion seating surface is a curved projecting shape that is curved and projects outward from an arc shape centering on the rotation center portion. Power transmission parts characterized by that.   3. The power transmission component according to claim 1, wherein the first portion and the connecting portion are integrally formed as a press-formed product of sheet metal, and the second portion is different from the press-formed product. A power transmission component, wherein the tip of the connecting portion is coupled to the other molded product.

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