JP2007205420A - Differential device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a differential device having a stronger positioning force at top ends of pinion shafts than the prior art by increasing an area of contact between the pinion shafts at the top ends thereof so as to increase friction resistance. <P>SOLUTION: The differential device 1 includes a differential case 2 and the plurality of pinion shafts 3a, 3b, 3c, 3d arranged within the differential case 2. The pinion shafts are assembled in such a manner that the top ends thereof are opposed to a rotary shaft X of the differential case 2. In the differential device 1, axial central portions of the pinion shafts are each formed in a substantially cylindrical shape, and the top ends of the pinion shafts respectively have two tapered inclined surfaces 8a and 8b, 8c and 8d, 8e and 8f, and 8g and 8h. A pinion shaft assembly 7 is formed by circumferentially assembling the pinion shafts in such a state that the adjacent inclined surfaces of the pinion shafts are in contact with each other. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a differential device for assembling a plurality of pinion shafts in a differential case.

Conventionally, a differential device includes three pinion shafts, a pinion gear that is pivotally supported by the three pinion shafts, a side gear that meshes with the pinion gear, and an annular collar having a through hole that positions the pinion gear at the center of the differential device. ing. The three pinion shafts are composed of one long pinion shaft and two short pinion shafts that are about 1/2 shorter in length than the long pinion shaft. The tip of the short pinion shaft has a plane perpendicular to the axial direction of the short pinion shaft, and the outer periphery of the central portion of the long pinion shaft that is in contact with this plane has a cylindrical shape. For this reason, the short pinion shaft and the long pinion shaft are in line contact.
Reality 3-2036

  However, since the pinion shafts are in line contact with each other, there is a problem that the contact portion is small and positioning of the tip side of the pinion shafts cannot be performed sufficiently.

  Accordingly, the present invention has been made in view of the above circumstances, and provides a differential device that can increase the contact portion on the tip side of pinion shafts and position the tip side of pinion shafts more strongly than before. The purpose is to do.

  The differential device of the present invention is a differential device in which tips of a plurality of pinion shafts arranged in a differential case are assembled so as to oppose a rotation shaft of the differential case, and the plurality of pinion shafts has an axial center portion of the pinion shaft. While having a substantially cylindrical shape, the tip of the pinion shaft has two inclined surfaces that are tapered, and the inclined surfaces of adjacent pinion shafts are brought into contact with each other so that a plurality of pinion shafts are The first feature is to form a pinion shaft assembly by assembling in the direction.

  In the differential device of the present invention, in addition to the first feature, each inclined surface of the plurality of pinion shafts is calculated by centering on the axis of each pinion shaft (360 ÷ number of the plurality of pinion shafts ÷ 2). The second feature is that the angle is inclined.

  In addition to the second feature described above, the differential device of the present invention forms a concave portion at the tip of a plurality of pinion shafts, and also has a circumferential concave connection formed by the concave portions of the plurality of pinion shafts assembled in the circumferential direction. A third feature is that an annular or plate-like positioning member is fitted to the portion.

  In addition to the third feature, the differential device of the present invention has a fourth feature that the positioning member is disposed inside the pinion shaft assembly.

  In addition to the fourth feature, the differential device of the present invention has a fifth feature that the positioning member is circular with a radius r, and the concave coupling portion is larger than the positioning member.

  In addition to the fifth feature described above, the differential device of the present invention has a sixth feature in that the tip of the pinion shaft where two inclined surfaces of the pinion shaft intersect has a cut-out surface.

  According to the differential device of the first feature of the present invention, in the differential device in which the tips of the plurality of pinion shafts arranged in the differential case are assembled to face the rotation shaft of the differential case, the plurality of pinion shafts are pinion While the central portion of the shaft in the axial direction is formed in a substantially cylindrical shape, the tip of the pinion shaft has two inclined surfaces cut out in a tapered shape, and the inclined surfaces of adjacent pinion shafts are brought into contact with each other, Since the pinion shaft assembly is formed by assembling the plurality of pinion shafts in the circumferential direction, the contact portion on the tip side of the pinion shafts is in surface contact with the inclined surface. Thereby, a contact part becomes large and positioning of the front end side of pinion shafts can be performed strongly.

  According to the differential device of the second feature of the present invention, each inclined surface of the plurality of pinion shafts is at an angle calculated from the axis of each pinion shaft (360 ÷ number of the plurality of pinion shafts ÷ 2). Since it is inclined, the tips of the plurality of pinion shafts have the same shape, and mass production is possible. For this reason, the cost of the tip processing of a plurality of pinion shafts can be reduced.

  According to the differential device of the third feature of the present invention, the concave portions are formed at the tips of the plurality of pinion shafts, and the circumferential concave coupling portion formed by the concave portions of the plurality of pinion shafts assembled in the circumferential direction. Since the annular or plate-like positioning member is fitted, the front end side positioning of the plurality of pinion shafts can be easily performed.

  According to the differential device of the fourth feature of the present invention, since the positioning member is disposed inside the pinion shaft assembly, the positioning member can be held inside the tip end of the pinion shaft. As a result, when the entire length of the pinion gear is increased in order to increase the durability of the pinion gear supported by the pinion shaft, the tip of the pinion gear does not come into contact with the positioning member, and the degree of freedom in designing the pinion gear can be increased.

  According to the differential device of the fifth aspect of the present invention, the positioning member is circular with a radius r, and the concave coupling portion is larger than the positioning member. Therefore, the annular or plate-like positioning member is a pinion shaft. Can be fitted at any position in the circumferential direction of the recess. Therefore, it is easy to fit the plurality of pinion shafts and the positioning member.

  According to the differential device of the sixth aspect of the present invention, the tip of the pinion shaft at which the two inclined surfaces of the pinion shaft intersect has a notched surface, so that the tip of the pinion shaft does not become sharp. Therefore, safety can be ensured for the operator who installs the differential device. Moreover, when the assembly | attachment to the circumferential direction of several pinion shafts is complete | finished, it can be confirmed from a notch surface whether the positioning member is fitted.

  1 and 5 show an embodiment of the present invention. FIG. 1 is a partial cross-sectional front view of the differential device (A-A cross-sectional side view of FIG. 2), and FIG. 2 is a cross-sectional side view of the differential device. 3 is a view in the middle of assembling the pinion shaft of the differential device being inserted into the differential case, FIG. 4A is a plan view of the pinion shaft, FIG. 4B is a front view of the pinion shaft, FIG. 4C is a left side view of the pinion shaft, FIG. 4D is a right side view of the pinion shaft, FIG. 5A is a plan view of the positioning member, and FIG. 5B is a front view of the positioning member. 6A is a plan view of the positioning member of the second embodiment, FIG. 6B is a front view of the positioning member of the second embodiment, and FIG. 7A is the third embodiment. FIG. 7B is a plan view of the positioning member of the example, and FIG. It is a front view of the member.

  First, the differential apparatus 1 is demonstrated based on FIG.1 and FIG.2. The differential device 1 has a first boss portion 13 and a second boss portion 14 formed in the axle direction, a differential case 2 rotatably supported in a differential carrier (not shown), and a differential case 2 assembled in the differential case 2. The pinion shafts 3a, 3b, 3c, 3d rotating integrally with each other, the positioning member 4 for positioning the tips of the plurality of pinion shafts 3a, 3b, 3c, 3d, and the pinion shafts 3a, 3b, 3c, 3d are substantially cylindrical. The four pinion gears 6a, 6b, 6c, 6d and the pinion shafts 3a, 3b, 3c, 3d that are rotatably supported by being inserted into the shaped pinion gear holes 5a, 5b, 5c, 5d are removed from the differential case 2. The fixing pins 15a, 15b, 15c, 15d for preventing this and the plurality of pinion gears 6a, 6b, 6c, 6d mesh That includes a first side gear 16a and a second side gear 16b. Thrust washers 18a, 18b, 18c for pinion gears provided with thrust washer holes 17a, 17b, 17c, 17d into which pinion shafts 3a, 3b, 3c, 3d can be inserted between the differential case 2 and the pinion gears 6a, 6b, 6c, 6d. 18d, and between the differential case 2 and the side gears 16a, 16b are disposed side gear thrust washers 20a, 20b provided with thrust washer holes 19a, 19b into which drive shafts (not shown) can be inserted. The differential case 2 includes a first differential case 2a and a second differential case 2b. A bolt (not shown) is inserted and fixed in a fixing hole of a ring gear (not shown), a fixing hole 30a of the first differential case 2a, and a fixing hole 30b of the second differential case 2b. Thus, the ring gear, the first differential case 2a, and the second differential case 2b are assembled together.

  Next, the internal structure of the differential case 2 will be described in detail. Inside the first differential case 2a and the second differential case 2b, there are a plurality of first side gears 16a and second side gears 16b fitted to two drive shafts (not shown), and a plurality of first side gears 16a and second side gears 16b. Pinion gears 6a, 6b, 6c, and 6d. The plurality of pinion shafts 3 a, 3 b, 3 c, 3 d that rotatably support the plurality of pinion gears 6 a, 6 b, 6 c, 6 d are assembled so as to face the rotation axis X of the differential case 2. The plurality of pinion shafts 3a, 3b, 3c, 3d form a pinion shaft assembly 7 by being assembled in the circumferential direction. The first differential case 2a has differential case holes 23a, 23b, 23c, and 23d for inserting the pinion shafts 3a, 3b, 3c, and 3d into the first differential case 2a. Four places are formed on the peripheral surface at intervals of 90 °.

  Next, the pinion shaft assembly 7 will be described in detail. As shown in FIG. 3, the plurality of pinion shafts 3a, 3b, 3c, 3d have two inclined surfaces 8a, 8b, 8c, 8d, 8e, 8f, 8g cut out so that their tips are tapered. 8h. Then, the inclined surfaces 8a, 8b, 8c, 8d, 8e, 8f, 8g, and 8h formed on the pinion shafts 3a, 3b, 3c, and 3d of the adjacent pinion shafts 3a, 3b, 3c, and 3d are brought into contact with each other. Is assembled in the circumferential direction. Recesses 9a, 9b, 9c, 9d are formed at the tips of the pinion shafts 3a, 3b, 3c, 3d, and at the tips of the pinion shafts 3a, 3b, 3c, 3d assembled in the circumferential direction, The concave connecting portion 9 is formed. The pinion shaft assembly 7 is obtained by fitting the positioning member 4 to the concave coupling portion 9. The rear ends of the pinion shafts 3a, 3b, 3c, 3d forming the pinion shaft assembly 7 are inserted into the four differential case holes 23a, 23b, 23c, 23d of the first differential case 2a, and the fixing pins 15a , 15b, 15c, 15d are fixed pin insertion holes 25a, 25b, 25c, 25d of the first differential case 2a and fixed pin insertion holes 11a, 11b, 11c formed at the rear ends of the pinion shafts 3a, 3b, 3c, 3d. , 11d prevents the four pinion shafts 3a, 3b, 3c, 3d from falling out of the first differential case 2a.

  Next, the plurality of pinion shafts 3a, 3b, 3c, 3d forming the pinion shaft assembly 7 will be described. In this embodiment, the plurality of pinion shafts 3a, 3b, 3c, 3d are all formed in the same shape. As shown in FIG. 4, the pinion shafts 3a, 3b, 3c, 3d are centered on the axis lines P1, P2, P3, P4 of the pinion shafts 3a, 3b, 3c, 3d (360 ÷ There are two inclined surfaces 8a, 8b, 8c, 8d, 8e, 8f, 8g and 8h cut out at an angle calculated by the number of pinion shafts divided by 2). In this embodiment, since there are four pinion shafts 3a, 3b, 3c, 3d, 360 ÷ 4 ÷ 2 = 45. That is, the inclined surfaces 8a, 8b, 8c, 8d, 8e, 8f, 8g, and 8h, which are notched at 45 degrees around the axis lines P1, P2, P3, and P4 of the pinion shaft, are respectively pinion shafts 3a, 3b, and 3c. , 3d axes P1, P2, P3, and P4 are formed symmetrically. In addition, the tip of the pinion shafts 3a, 3b, 3c and 3d where the two inclined surfaces 8a, 8b, 8c, 8d, 8e, 8f, 8g and 8h of the pinion shafts 3a, 3b, 3c and 3d intersect is notched. It has notched surfaces 12a, 12b, 12c, and 12d.

  The pinion gears 6a, 6b, 6c, 6d are formed in a substantially cylindrical shape at the center in the axial direction of the pinion shafts 3a, 3b, 3c, 3d on which the pinion gears 6a, 6b, 6c, 6d are supported so that the pinion gears 6a, 6b, 6c, 6d can rotate. Has been. In the central portion in the axial direction, a lubricant (not shown) that lubricates the inside of the differential case 2 is prevented in order to prevent the pinion gear holes 5a, 5b, 5c, 5d and the pinion shaft outer peripheral surface from being seized by the rotation of the pinion gears 6a, 6b, 6c, 6d. Lubricant intake planes 10a, 10b, 10c, 10d, 10e, 10f, 10g and 10h are formed. Further, fixed pin holes 11a, 11b, 11c, 11d into which the fixed pins 15a, 15b, 15c, 15d are inserted are formed at the rear ends of the pinion shafts 3a, 3b, 3c, 3d.

  At the tips of the plurality of pinion shafts 3a, 3b, 3c, 3d, there are recesses 9a, 9b, 9c, 9d. The circumferential concave coupling portion 9 to which the bottom portions 13a, 13b, 13c, 13d of the concave portions 9a, 9b, 9c, 9d are coupled is formed by two inclined surfaces 8a, 8b, 8c, 8d, 8e, 8f, 8g, 8h. It is formed in a square shape having a radius R with the intersection lines K1, K2, K3, and K4 as the center.

  Next, the positioning member 4 fitted to the circumferential concave connecting portion 9 will be described with reference to FIG. The positioning member 4 is formed in a circular shape with a radius r. The radius R is set to a value larger than the radius r. The radius r of the positioning member 4 is set to a numerical value so as to be disposed inside the pinion shaft assembly 7. The positioning member 4 is made of a plate member that is slightly thinner than the width t of the recesses 9a, 9b, 9c, 9d.

  Next, an assembly method for assembling the pinion shafts 3a, 3b, 3c, 3d, the positioning member 4, the pinion gears 6a, 6b, 6c, 6d, the first side gear 16a, the second side gear 16b and the like to the differential case 2 will be described.

  First, the first side gear 16a, in which the side gear thrust washer 20a is fitted to the first differential case 2a, is placed on the rotation axis X of the differential case so that the tooth profile of the first side gear 16a faces the center Y of the differential case.

  Next, the pinion gear thrust washers 18a, 18b, 18c, and 18d are attached to the ball seat surfaces of the pinion gears 6a, 6b, 6c, and 6d, and the four pinion gears are attached with the pinion gear thrust washers 18a, 18b, 18c, and 18d, respectively. 6a, 6b, 6c, 6d are arranged on the first side gear 16a with the tooth shapes of the pinion gears 6a, 6b, 6c, 6d facing the rotation axis X of the differential case, and spaced apart from each other by 90 ° about the differential case rotation axis X. Place. At this time, the pinion gear holes 5a and 5c of the two pinion gears 6a and 6c provided diagonally and the differential case holes 23a and 23c provided in the first differential case 2a are arranged on the same straight line. Further, the pinion gear holes 5b, 5d of the two pinion gears 6b, 6d provided at other diagonals and the two differential case holes 23b, 23d provided at the diagonals of the first differential case 2a are also on the same straight line. Like that.

  Then, the pinion shaft 3a is inserted in the direction of the rotation axis X of the differential case 2 from the tip thereof through the differential case hole 23a, the thrust washer hole 17a formed in the pinion gear thrust washer 18a, and the pinion gear hole 5a formed in the pinion gear 6a. Then, the positioning member 4 is fitted into the recess 9a formed at the tip of the pinion shaft 3a. Next, the pinion shaft 3c passes through the differential case hole 23c, the thrust washer hole 17c formed in the pinion gear thrust washer 18c, and the pinion gear hole 5c formed in the pinion gear 6c from the tip in the direction of the rotation axis X of the differential case 2. The positioning member 4 is inserted into the recess 9a formed at the tip of the pinion shaft 3a. Similarly, the pinion shaft 3b passes through the differential case hole 23b, the thrust washer hole 17b formed in the pinion gear thrust washer 18b, and the pinion gear hole 5b formed in the pinion gear 6b from the tip in the direction of the rotation axis X of the differential case 2. The positioning member 4 is inserted into the recess 9b formed at the tip of the pinion shaft 3b. At this time, the inclined surfaces 8b, 8c, 8d, and 8e of the adjacent pinion shafts 3a, 3b, and 3c are in contact with each other. Finally, the pinion shaft 3d passes through the differential case hole 23d, the thrust washer hole 17d formed in the pinion gear thrust washer 18d, and the pinion gear hole 5d formed in the pinion gear 6d from the tip of the pinion shaft 3d in the rotational axis X direction of the differential case 2. The positioning member 4 is inserted into the recess 9d formed at the tip of the pinion shaft 3d. At this time, the inclined surfaces 8f, 8g, 8h, and 8a of the adjacent pinion shafts 3c, 3d, and 3e contact each other, and the pinion shaft assembly 7 assembled in the circumferential direction is completed.

  Subsequently, the fixing pins 15a, 15b, 15c, 15d are fixed pin insertion holes 25a, 25b, 25c, 25d provided in the first differential case 2a and the fixing pin insertion holes 11a, 11b of the pinion shafts 3a, 3b, 3c, 3d, The pinion shafts 3a, 3b, 3c, 3d are inserted into the 11c, 11d to prevent the first differential case 2a from coming off.

  Next, the second side gear 16b having the side gear thrust washer 20b mounted on the opposite side of the tooth profile is placed on the four pinion gears 6a, 6b, 6c, 6d so that the tooth profile of the second side gear 16b faces the pinion gear side. To do. Subsequently, the second differential case 2b is placed on the second side gear 16b. Finally, the ring gear (not shown), the first differential case 2a, and the second differential case 2b are fixed with bolts (not shown), and the differential device 1 is completed.

  The operating state of the differential device 1 will be described. A driving force of a power source (not shown) (for example, an engine) is input to a ring gear (not shown) attached to the flange portion 21 of the differential case 2 via a transmission. The differential case 2 rotates in the center. At this time, the pinion shafts 3a, 3b, 3c, and 3d attached to the differential case 2 also rotate integrally with the differential case 2 around the differential case rotation axis X, so that the pinion gear 6a that is pivotally supported by the pinion shafts 3a, 3b, 3c, and 3d. , 6b, 6c, 6d and the first side gear 16a and the second side gear 16b meshing with the pinion gears 6a, 6b, 6c, 6d also rotate about the differential case rotation axis X. As a result, the driving force is transmitted to the left and right drive shafts (not shown) that are spline-engaged with the inner periphery of the first side gear 16a and the second side gear 16b, and the drive shaft rotates integrally with the differential case 2. When a difference in rotation occurs between the left and right drive shafts, a rotational force different from the rotation of the differential case 2 is input from the drive shaft side to the pinion gears 6a, 6b, 6c, 6d through the first side gear 16a or the second side gear 16b. The pinion gears 6a, 6b, 6c, 6d, the first side gear 16a, and the second side gear 16b rotate separately from the differential case 2, thereby absorbing the rotational difference between the left and right drive shafts.

  As described above, according to the differential device 1, the differential device 1 in which the tips of the plurality of pinion shafts 3 a, 3 b, 3 c, 3 d disposed in the differential case 2 are assembled to face the rotation axis X of the differential case 2. The plurality of pinion shafts 3a, 3b, 3c, 3d are formed such that the central portions in the axial direction of the pinion shafts 3a, 3b, 3c, 3d are formed in a substantially cylindrical shape, while the tips of the pinion shafts 3a, 3b, 3c, 3d Has two inclined surfaces 8a, 8b, 8c, 8d, 8e, 8f, 8g, and 8h cut out in a tapered shape, and the inclined surfaces 8a, 8b, and 8c of the adjacent pinion shafts 3a, 3b, 3c, and 3d. , 8d, 8e, 8f, 8g, and 8h are brought into contact with each other, and a plurality of pinion shafts 3a, 3b, 3c, and 3d are assembled in the circumferential direction. To form the shift assembly 7, the contact portion is inclined face 8a of the front end side between the pinion shaft, comprising 8b, 8c, 8d, 8e, 8f, 8g, and surface contact with 8h. Thereby, a contact part becomes large and positioning of the front end side of pinion shafts can be performed more strongly than before.

  In addition, the inclined surfaces 8a, 8b, 8c, 8d, 8e, 8f, 8g, and 8h of the plurality of pinion shafts 3a, 3b, 3c, and 3d are respectively connected to the axis lines P1, P2, and Pn of the pinion shafts 3a, 3b, 3c, and 3d. Since it is inclined at an angle calculated by (360 ÷ number of plural pinion shafts ÷ 2) around P3 and P4, the tips of the plural pinion shafts 3a, 3b, 3c, 3d have the same shape, and mass production Is possible. For this reason, the cost of the tip processing of the plurality of pinion shafts 3a, 3b, 3c, 3d can be reduced.

  Recesses 9a, 9b, 9c, 9d are formed at the tips of the plurality of pinion shafts 3a, 3b, 3c, 3d, and the recesses 9a, 9b, 9b of the plurality of pinion shafts 3a, 3b, 3c, 3d assembled in the circumferential direction are formed. Since the annular or plate-like positioning member 4 is fitted to the circumferential concave connecting portion 9 formed by 9c and 9d, positioning of the tip side of the plurality of pinion shafts can be easily performed.

  Since the positioning member 4 is disposed inside the pinion shaft assembly 7, the positioning member 4 can be held inside the tip of the pinion shafts 3a, 3b, 3c, 3d. As a result, when the total length of the pinion gears 6a, 6b, 6c, 6d is increased in order to increase the durability of the pinion gears 6a, 6b, 6c, 6d supported by the pinion shafts 3a, 3b, 3c, 3d, the pinion gears 6a, 6b , 6c, 6d does not contact the positioning member 4, and the design freedom of the pinion gears 6a, 6b, 6c, 6d can be expanded.

  Since the positioning member 4 is circular with a radius r and the concave connecting portion 9 is larger than the positioning member 4, the annular or plate-like positioning member 4 is a concave circle of the pinion shafts 3a, 3b, 3c, 3d. It can be fitted at any position in the circumferential direction. Therefore, the plurality of pinion shafts 3a, 3b, 3c, 3d and the positioning member 4 can be easily fitted.

  The tip end of the pinion shafts 3a, 3b, 3c, 3d where the two inclined surfaces 8a, 8b, 8c, 8d, 8e, 8f, 8g, 8h of the pinion shafts 3a, 3b, 3c, 3d intersect is cut out. Since the notch surfaces 12a, 12b, 12c, and 12d are provided, the tips of the pinion shafts 3a, 3b, 3c, and 3d are not sharpened, and safety can be ensured for an operator who installs the differential device. Further, when the assembly of the plurality of pinion shafts 3a, 3b, 3c, 3d in the circumferential direction is completed, whether or not the positioning member 4 is fitted is determined from the cutout surfaces 12a, 12b, 12c, 12d. Can be confirmed.

  In this embodiment, the case where there are four pinion gears meshed with the two side gears 16a and 16b has been described. However, when the number of pinion gears meshed with the two side gears 16a and 16b is changed to three, five The present invention is also applicable to a case where the number of pinion gears attached to the differential device 1 is changed, such as when changing to Since the number of pinion shafts has a one-to-one relationship with the number of pinion gears, in the above-described case, the number of pinion shafts is three or five. When the number of pinion shafts is three, the two inclined surfaces formed at the tip end of the pinion shaft are 360 ÷ 3 ÷ 2 = 60, that is, both end angles of the pinion shaft are 60 degrees around the axis P of the pinion shaft. It becomes. When the number of pinion shafts is five, the inclined surfaces formed at both ends of the pinion shaft are 360 ÷ 5 ÷ 2 = 36, that is, the both ends of the pinion shaft are 36 around the axis P of the pinion shaft. Degree.

  Further, in this embodiment, the inclined surfaces 8a, 8b, 8c, 8d, 8e, 8f, 8g, and 8h formed at both corners of the tip end of the pinion shaft are respectively connected to the axes P1, P2, and the axis lines P1, P2, and the pinion shafts 3a, 3b, 3c, 3d. Although it is inclined at an angle calculated by (360 ÷ number of pinion shafts ÷ 2) around P3 and P4, it may be inclined at an angle different from the inclination angle obtained by the above formula. For example, the inclined surfaces 8a, 8b, 8e, 8f of the pinion shafts 3a, 3c are inclined 50 degrees around the axis lines P1, P3 of the pinion shafts 3a, 3c, and the inclined surfaces 8c, 8d, 8g, 8h may be inclined at 40 degrees or the like about the axes P2 and P4 of the pinion shafts 3b and 3d.

  Further, in the present embodiment, the circumferential concave connecting portion 9 is formed in a square shape, but it may be formed in the same circular shape as the positioning member 4. Although the positioning member 4 uses a circular plate member, an annular member may be used as shown in FIG. Further, the circumferential concave connecting portion 9 may be square, and the positioning member may be a square plate member as shown in FIG. Although the pinion shafts 3a, 3b, 3c, 3d are assembled in the order of the pinion shafts 3a, 3c, 3b, 3d, they may be assembled in a different order. The differential case 2 is divided into two parts, the first differential case 2a and the second differential case 2b, but may be formed integrally or divided into three or more. As an example of the power source, an engine is illustrated, but a motor or other power source may be used.

It is a fragmentary sectional front view (AA sectional side view of FIG. 2) of the differential apparatus of the Example of this invention. It is a cross-sectional side view of the differential apparatus of the Example of this invention. It is the figure in the middle of the assembly | attachment which is inserting the pinion shaft of the differential apparatus of the Example of this invention in the differential case. FIG. 4A is a plan view of the pinion shaft, FIG. 4B is a front view of the pinion shaft, and FIG. 4C is a left side view of the pinion shaft. FIG. 4D shows a pinion shaft. FIG. 5A is a plan view of the positioning member, and FIG. 5B is a front view of the positioning member according to the embodiment of the present invention. FIG. 6A is a plan view of a positioning member, and FIG. 6B is a front view of the positioning member, showing a positioning member according to a second embodiment of the present invention. FIG. 7A is a plan view of a positioning member, and FIG. 7B is a front view of the positioning member, showing a positioning member according to a third embodiment of the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Differential apparatus 2 Differential case 3a, 3b, 3c, 3d Pinion shaft 4 Positioning member 7 Pinion shaft assembly 8a, 8b, 8c, 8d, 8e, 8f, 8g, 8h Inclined surface 9a, 9b, 9c, 9d Concave 9 Concave connection Part 12a, 12b, 12c, 12d Notch surface 13a, 13b, 13c, 13d Bottom of recess P1, P2, P3, P4 Axis line of pinion shaft K1, K2, K3, K4 Intersection line of two inclined surfaces

Claims (6)

In the differential device (1) in which the tips of the plurality of pinion shafts (3a, 3b, 3c, 3d) arranged in the differential case (2) are assembled to face the rotation shaft (X) of the differential case (2).
The plurality of pinion shafts (3a, 3b, 3c, 3d) are formed such that the central portion in the axial direction of the pinion shaft (3a, 3b, 3c, 3d) is formed in a substantially cylindrical shape, while the pinion shafts (3a, 3b, 3c) , 3d) has two inclined surfaces (8a, 8b, 8c, 8d, 8e, 8f, 8g, 8h) with the tip thereof being cut out in a tapered shape,
The inclined surfaces (8a, 8b, 8c, 8d, 8e, 8f, 8g, 8h) of the adjacent pinion shafts (3a, 3b, 3c, 3d) are brought into contact with each other, and the plurality of pinion shafts (3a, 3b, 3c, 3d) are assembled in the circumferential direction to form a pinion shaft assembly (7).   The inclined surfaces (8a, 8b, 8c, 8d, 8e, 8f, 8g, 8h) of the plurality of pinion shafts (3a, 3b, 3c, 3d) are respectively the pinion shafts (3a, 3b, 3c, 3d). 2. The differential apparatus according to claim 1, wherein the differential apparatus is inclined at an angle calculated by (360 ÷ number of plural pinion shafts ÷ 2) about an axis (P1, P2, P3, P4). Forming recesses (9a, 9b, 9c, 9d) at the tips of the plurality of pinion shafts (3a, 3b, 3c, 3d);
An annular or plate-like positioning in a circumferential concave coupling portion (9) formed by concave portions (9a, 9b, 9c, 9d) of a plurality of pinion shafts (3a, 3b, 3c, 3d) assembled in the circumferential direction The differential device according to claim 1, wherein the member (4) is fitted.   The differential device according to claim 3, wherein the positioning member (4) is arranged inside the pinion shaft assembly (7).   The said positioning member (4) is circular with a radius (r), The said recessed connection part (9) is a magnitude | size more than the said positioning member (4), The Claim 3 or 4 characterized by the above-mentioned. Differential device.   The tip of the pinion shaft (3a, 3b, 3c, 3d) where the two inclined surfaces (8a, 8b, 8c, 8d, 8e, 8f, 8g, 8h) of the pinion shaft (3a, 3b, 3c, 3d) intersect The differential device according to claim 3, wherein the differential device has a cut-out surface (12 a, 12 b, 12 c, 12 d).

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