JP2009168170A - Differential gear device for vehicle - Google Patents

Abstract

A vehicle differential gear device capable of improving the strength of a housing is provided.
First and second accommodation holes 21 and 22 for rotatably accommodating first and second planetary gears are formed in a main body 2A, and first and second transfer gears 7 and 8 are provided. In the vehicle differential gear device in which the third and fourth accommodation holes 23 and 24 that are rotatably accommodated are formed, the first and second accommodation holes 21 and 22 are set as blind holes, and one end portion of the main body portion 2A. And the other end. First and second support meat portions 31 and 32 that are continuous with each other in the circumferential direction of the main body 2A are formed between the third and fourth accommodation holes 23 and 24 and the inner peripheral surface of the main body 2A. One side part in the circumferential direction of the end part located on the second accommodation hole 22 side of the first support meat part 31 is continued to the other part of the main body part 2A. The other side part in the circumferential direction of the end part located on the first housing hole 21 side of the second support meat part 32 is continued to the other part 42 of the main body part 2A.
[Selection] Figure 3

Description

  The present invention relates to a vehicle differential gear device in which a pair of transfer gears are provided between a pair of planetary gears.

  In general, a vehicle differential gear device includes a housing that is driven to rotate about a rotation axis, a pair of sun gears that have a twisted tooth rotatably accommodated in the housing, and at least a rotatably supported by the housing. And a pair of planetary gears. The pair of planetary gears mesh with the pair of sun gears and with each other. Therefore, when the housing is rotationally driven, the rotational driving force is transmitted to the pair of sun gears via the pair of planetary gears. The rotational driving force transmitted to the pair of sun gears is transmitted to, for example, the left and right wheels via an output shaft connected to each sun gear. When a difference occurs in the load acting on the left and right wheels, the pair of sun gears rotate differentially.

  Incidentally, in some cases, it is desired that the differential gear device for a vehicle increases a differential limiting force that limits the differential rotation of the sun gear in order to improve traveling performance on a rough road of the vehicle. Therefore, in the thing of the following patent document 1, a pair of transfer gear is provided between a pair of planetary gears. That is, a pair of sun gears are connected by a gear train composed of four gears: a first planetary gear, a first transfer gear, a second transfer gear, and a second planetary gear. In the differential gear device configured as described above, when the pair of sun gears rotates differentially, not only does the pair of planetary gears generate frictional resistance to limit the rotation but also the pair of transfer gears. A frictional resistance is generated to limit the rotation. As a result, the differential rotation of the pair of sun gears can be limited with a differential limiting force that is as large as the frictional resistance generated in the transfer gear.

  However, when a pair of transfer gears are provided, there is a problem that the strength of the housing is lowered. That is, the housing is formed with first and second accommodation holes for accommodating a pair of planetary gears, respectively. The first and second accommodation holes are spaced apart from each other by a suitable distance in the circumferential direction of the housing, and a third and fourth accommodation hole for accommodating a pair of transfer gears are formed between them. The As for the 1st-4th accommodation hole, the side part inside the radial direction of a housing is open | released by the internal space of the housing. As a result, the first to fourth accommodation holes as a whole exhibit a concave state. The recess is separated from the first and second receiving recesses in the circumferential direction by the amount of the third and fourth receiving holes as compared with the case where the pair of receiving holes are formed to receive the pair of planetary gears. The width in the circumferential direction is increased by the amount that is applied. In addition, the third and fourth accommodation holes are disposed radially outward from the first and second accommodation holes in order to prevent the transfer gear from interfering with the sun gear. As a result, the depth of the recess is increased. Since a recess having a wide width and a deep depth is formed, there has been a problem that the strength of the housing is lowered.

  Therefore, in the one described in Patent Document 1, a partition wall portion is formed at the center portion in the axial direction of the inner peripheral surface of the housing. The partition wall is formed over the entire circumference of the housing so as to close the opening of the recess formed by the four receiving holes. Therefore, the partition wall functions as a kind of reinforcing part and improves the strength of the housing.

Japanese Patent Laid-Open No. 10-227348

  However, the conventional differential gear device for a vehicle has a problem that the entire length of the housing is increased by the amount of the partition wall, and as a result, the entire differential gear device is increased in size.

In order to solve the above problems, the present invention provides a housing having a cylindrical portion centered on a rotation axis, and first and second sun gears supported rotatably on the housing around the rotation axis. First and second planetary gears supported by the housing in parallel to the rotation axis and capable of rotating, and meshing with the first and second sun gears, respectively, and parallel to the rotation axis and rotatable in the housing And the first and second transfer gears meshing with each other and meshing with each other, and the housing is parallel to the rotational axis and in the circumferential direction of the cylindrical portion. First and second receiving holes that are spaced apart from each other and have inner side portions in the radial direction of the housing intersecting the inner peripheral surface of the housing, parallel to the rotation axis And each side which is arrange | positioned so that it may be located between the said 1st and 2nd accommodation holes in the circumferential direction of the said housing, and the side parts adjacent to the circumferential direction of the said housing mutually cross | intersect and mutually spaced apart in the circumferential direction A third and a fourth housing hole are formed, each of which intersects the first and second housing holes, and the first and second planetary gears are rotatably housed in the first and second housing holes, In the vehicle differential gear device in which the first and second transfer gears are rotatably accommodated in the third and fourth accommodation holes, respectively, the first accommodation hole is located on the first sun gear side of the housing. The second accommodation hole is formed as a stop hole extending from the other end surface of the housing on the second sun gear side toward the one end side. The third and fourth accommodation holes are formed from the inner peripheral surface of the housing so that a flesh portion is formed between the third and fourth accommodation holes and the inner peripheral surface of the cylindrical portion. The second sun of the third receiving hole is arranged so as to be spaced apart radially outward, and an end portion of the flesh portion located on the second sun gear side is continuous with the other part of the housing in the circumferential direction. The end located on the gear side is spaced apart from the first housing hole in the longitudinal direction, and the end located on the first sun gear side of the flesh is continuous with the other part of the housing in the circumferential direction. The end of the fourth housing hole located on the first sun gear side is spaced apart from the second housing hole in the longitudinal direction.
In this case, the housing has a main body portion having a bottom portion at one end portion and an opening at the other end portion, and the cylindrical portion is formed, and a lid portion that closes the opening portion of the main body portion. The first sun gear is accommodated in one end portion on the bottom side inside the main body, the second sun gear is accommodated in the other end portion inside the main body portion, and the first accommodation hole is the bottom portion of the main body portion. The second receiving hole is formed as a blind hole extending toward the one end side from the other end surface positioned on the opening side of the main body. It is desirable that
The third accommodation hole is formed as a blind hole extending from one end surface located on the bottom side of the main body portion toward the other end side, and the fourth accommodation hole is located on the opening side of the main body portion. May be formed as a blind hole extending toward the other end side, and the third accommodation hole is formed as a blind hole extending toward the one end side from the other end surface located on the opening side of the main body, The fourth housing hole may be formed as a blind hole extending from one end surface located on the bottom side of the main body portion toward the other end side, or the third and fourth housing holes may be formed on the main body portion. You may form as a blind hole extended toward the other end side from the one end surface located in the bottom part side.
It is desirable that the lid portion is formed with an annular protrusion that fits into an end portion of the opening on the inner peripheral surface of the main body portion.

  According to the present invention having the above-described characteristic configuration, if the meat portion formed between the inner peripheral surface of the housing and the third and fourth accommodation holes is at the end located on the first accommodation hole side, the housing In the circumferential direction of the second housing hole, and the end portion located on the second housing hole side is continuous with the portion located on the first housing hole side in the circumferential direction of the housing. As a result, both end portions in the rotation axis direction of the meat portion are supported by the housing. And since the meat part by which both ends were supported is formed between the inner peripheral surface of the housing and the third and fourth accommodation holes, the portion where the first to fourth accommodation holes of the housing are formed is the meat. Reinforced by the part. Therefore, the strength of the housing can be improved. And since it is not necessary to form a partition part, the full length of a housing can be restrained short.

The best mode for carrying out the present invention will be described below with reference to the drawings.
1 to 10 show a first embodiment of the present invention. The vehicle differential gear device 1 of this embodiment includes a housing 2, a pair of first and second sun gears 3 and 4, at least a pair of first and second planetary gears 5 and 6, and planetary gears 5 and 6. And the same number of pairs of first and second transfer gears 7 and 8.

  The housing 2 is rotationally driven about an axis of rotation L by an engine (not shown), and has a main body 2A and a lid 2B as shown in FIGS. The main body 2A has a cylindrical portion 2a and a bottom 2b formed integrally with one end of the cylindrical portion 2a (the right end portion in FIG. 1; the left and right mean the left and right in FIG. 1). It is comprised by the flange part 2c integrally formed in the other end part outer peripheral surface of the cylinder part 2a, and is formed in the bottomed cylinder shape as a whole. The inner peripheral surface of the cylindrical portion 2a is circular in cross section, and its axis is made to coincide with the rotation axis L. A through hole 2d penetrating on the rotation axis L is formed at the center of the bottom 2b. The lid portion 2B is abutted against the flange portion 2c and is fixed to the flange portion 2c with a bolt (not shown). A through hole 2e penetrating on the rotation axis is formed at the center of the lid 2B.

  Inside the housing 2, the first sun gear 3 is accommodated on the bottom 2b side, and the second sun gear 4 is accommodated on the lid 2B side. The first and second sun gears 3 and 4 are arranged in series on the rotation axis L in a state where the respective axis lines coincide with the rotation axis L. Moreover, the first and second sun gears 3 and 4 are supported by the housing 2 so as to be rotatable about the rotation axis L. Connection holes 3a and 4a are formed in the central portions of the first and second sun gears 3 and 4, respectively. One end of an output shaft (not shown) that rotatably passes through the through hole 2d is connected to the connecting hole 3a of the sun gear 3 so as not to rotate by spline fitting or the like. The other end of the output shaft is connected to, for example, one of the left and right front wheels. One end of an output shaft (not shown) that rotatably passes through the through hole 2e is connected to the connecting hole 4a of the sun gear 4 so as not to rotate by spline fitting or the like. The other end of the output shaft is connected to one of the left and right front wheels.

  The right end surface (outer end surface) of the first sun gear 3 is in contact with the bottom portion 2 b via the end washer 11. The left end surface (inner end surface) of the first sun gear 3 is in contact with the right end surface (inner end surface) of the second sun gear 4 via the center washer 12. The left end surface (outer end surface) of the second sun gear 4 is in contact with the lid portion 2 </ b> B via the end washer 13. Accordingly, the first and second sun gears 3 and 4 are supported by the housing 2 so as to be movable in the direction of the rotation axis L, but hardly move in the same direction.

  The main body 2A is provided with at least a pair of first and second accommodation holes 21 and 22. In this embodiment, as shown in FIG. 1, FIG. 3, FIG. 4 and FIG. 6 to FIG. 9, four pairs of first and second receiving holes 21 and 22 are provided. They are spaced apart at equal intervals in the circumferential direction. In addition, the pair of first and second accommodation holes 21 and 22 are arranged apart from each other by a predetermined interval in the circumferential direction of the main body 2A.

  The first and second accommodation holes 21 and 22 are arranged on one circumference centered on the rotation axis L. The inner side portions of the first and second receiving holes 21 and 22 located on the radially inner side of the main body portion 2A intersect the inner peripheral surface of the tubular portion 2a, and are opened to the inside of the tubular portion 2a at the intersecting portion. ing.

  As shown in FIG. 1, the first accommodation hole 21 extends in parallel with the rotation axis L, and one end (right end) is located on the first sun gear 3 side of the main body 2A, that is, the outer side of the bottom 2b. Is formed as a blind hole with an opening at the end face and a closed end at the other end. The opening part of the 1st accommodation hole 21 is closed by the cyclic | annular end plate 14, and the end plate 14 is being fixed to the outer end surface of the bottom part 2b with the volt | bolt B (refer FIG. 5). The bottom surface of the first accommodation hole 21 is positioned substantially at the same position as the left end surface of the sun gear 3 in the rotation axis L direction.

  The second accommodation hole 22 extends in parallel with the rotation axis L, and one end (left end) is opened on the left end surface located on the second sun gear 4 side of the main body 2A, that is, the end surface on the opening side of the main body 2A. The other end is formed as a closed hole. The opening of the second accommodation hole 22 is closed by the lid 2B. The bottom surface of the second accommodation hole 22 is positioned substantially at the same position as the right end surface of the sun gear 4 in the rotation axis L direction.

  The first planetary gear 5 is rotatably accommodated in the first accommodation hole 21. Therefore, the first planetary gear 5 is capable of rotating, and revolves around the rotation axis L when the housing 2 is driven to rotate. The first planetary gear 5 meshes with the first sun gear 3 at the intersection between the first accommodation hole 21 and the inner peripheral surface of the cylindrical portion 2a. The total length of the first planetary gear 5 is set to be approximately the same as the length of the first accommodation hole 21. Therefore, the first planetary gear 5 is accommodated in the first accommodation hole 21 so as to be movable in the longitudinal direction (direction of the rotation axis L), but hardly moves in the same direction.

  The second planetary gear 6 is rotatably accommodated in the second accommodation hole 22. Therefore, the second planetary gear 6 can rotate and revolves around the rotation axis L when the housing 2 is driven to rotate. The second planetary gear 6 meshes with the second sun gear 4 at the intersection between the first accommodation hole 22 and the inner peripheral surface of the cylindrical portion 2a. The entire length of the second planetary gear 6 is set to be approximately the same as the length of the second accommodation hole 22. Therefore, the second planetary gear 6 is accommodated in the first accommodation hole 22 so as to be movable in the longitudinal direction (direction of the rotation axis L), but hardly moves in the same direction.

  As shown in FIGS. 2 to 4 and FIGS. 6 to 9, the main body 2 </ b> A has third and fourth accommodation holes 23 and 24 extending in parallel with the rotation axis L, and the first and second accommodation holes 21 and 22. There are as many pairs as there are. The 3rd and 4th accommodation holes 23 and 24 are arranged so that it may be located between the 1st and 2nd accommodation holes 21 and 22 in the peripheral direction of main part 2A. In addition, in the circumferential direction of the main body 2 </ b> A, the third accommodation hole 23 is disposed adjacent to the first accommodation hole 21, and the fourth accommodation hole 24 is disposed adjacent to the second accommodation hole 22.

  As shown in FIGS. 3, 4, and 10, the third and fourth accommodation holes 23, 24 intersect with each other in the circumferential direction of the main body 2 </ b> A, and communicate with each other at the intersection. . The length of the 3rd accommodation hole 23 is longer than the 1st accommodation hole 21, and the right end part of the 3rd accommodation hole 23 and the 1st accommodation hole 21 are side parts adjacent to the peripheral direction of main part 2A. Intersect and communicate with each other at the intersection. The length of the fourth accommodation hole 24 is longer than that of the second accommodation hole 22, and the left end portion of the fourth accommodation hole 24 and the second accommodation hole 22 are adjacent to each other in the circumferential direction of the main body 2A. Intersect and communicate with each other at the intersection. Note that the left end opening of the third accommodation hole 23 is closed by the lid 2 </ b> B, and the right end opening of the fourth accommodation hole 24 is closed by the end plate 14.

  The first and second transfer gears 7 and 8 are rotatably accommodated in the third and fourth accommodation holes 23 and 24, respectively. Therefore, the first and second transfer gears 7 and 8 can rotate, and revolve around the rotation axis L when the housing 2 is driven to rotate. The lengths of the first and second transfer gears 7 and 8 are set to be substantially the same as the lengths of the third and fourth accommodation holes 23 and 24. Therefore, the third and fourth transfer gears 7 and 8 are accommodated in the third and fourth accommodation holes 23 and 24 so as to be movable in the longitudinal direction (direction of the rotation axis L), but move in the same direction. There is almost no.

  The first and second transfer gears 7 and 8 mesh with each other at the intersection of the third and fourth accommodation holes 23 and 24. The first transfer gear 7 meshes with the first planetary gear 5 at the intersection between the third accommodation hole 23 and the first accommodation hole 21. The second transfer gear 8 meshes with the second planetary gear 6 at the intersection between the fourth accommodation hole 24 and the second accommodation hole 22. Therefore, when the housing 2 is rotationally driven, the rotational driving force is transmitted to the first and second sun gears 3, 4 via the first and second transfer gears 7, 8 and the first and second planetary gears 3, 4. Is transmitted to. And it is transmitted to the left and right front wheels via the two output shafts from the first and second sun gears 3 and 4.

  Since the first and second sun gears 3 and 4, the first and second planetary gears 5 and 6, and the first and second transfer gears 7 and 8 have torsion teeth, the housing 2 is driven to rotate. A thrust force directed in the direction of the rotation axis L is generated on the meshing tooth surfaces of the gears 3 to 8. Due to this thrust force, the end surfaces of the gears 3 to 8 are pressed against each other, pressed against the inner surface of the housing 2, or pressed against the end plate 14. Therefore, a frictional resistance is generated between the contact end faces during the differential rotation of the first and second sun gears 3 and 4. Further, a frictional resistance is also generated between the inner peripheral surfaces of the first to fourth accommodation holes 21 to 24 and the outer peripheral surfaces of the first and second planetary gears 5 and 6 and the first and second transfer gears 7 and 8. appear. The differential rotation of the first and second sun gears 3 and 4 is limited by these frictional resistances.

  As shown in FIGS. 3, 4, and 9, the third and fourth accommodation holes 23, 24 are arranged on one circumference around the rotation axis L. In particular, in this embodiment, the first and second accommodation holes 21 and 22 are arranged on a circumference larger in diameter than the circumference on which the first and second accommodation holes 21 and 22 are arranged. The difference between the radius of the circumference where the third and fourth accommodation holes 23, 24 are arranged and the radius of the inner peripheral surface of the cylindrical portion 2a is set larger than the radius of the third and fourth accommodation holes 23, 24. Yes. As a result, a first support meat part (meat part) 31 that is a substantial part of the cylinder part 2a is formed between the third accommodation hole 23 and the inner peripheral surface of the cylinder part 2a. The first support shaft portion 31 extends along the third accommodation hole 23 and over its entire length. Similarly, between the 4th accommodation hole 24 and the internal peripheral surface of the cylinder part 2a, the 1st support flesh part 32 which is a part of substantial part of the cylinder part 2a is formed. The second support meat portion 32 extends along the fourth accommodation hole 24 and over its entire length. As for the 1st and 2nd support meat | flour parts 31 and 32, the side parts adjacent in the circumferential direction of 2 A of main-body parts are connected continuously. That is, one meat part is formed by the first and second support meat parts 31 and 32.

  The third accommodation hole 23 is longer than the first accommodation hole 21 as described above. As shown in FIG. 10, the third accommodation hole 23 communicates with the first accommodation hole 21 only at the right end portion, and the left end portion is separated from the first accommodation hole 21 in the direction of the rotation axis L. Therefore, the side part located in the 1st accommodation hole 21 side of the left end part of the 3rd accommodation hole 23 is not opened, but the 3rd accommodation hole 23 which is a part of substantial part of main part 2A (cylinder part 2a). It is closed by a portion 41 adjacent to. As a result, the side portion on the first accommodation hole 21 side of the left end portion of the first support meat portion 31 continues to the portion 41 and is supported by the left end portion of the main body portion 2 </ b> A via the portion 41.

  Similarly, the fourth accommodation hole 24 is longer than the second accommodation hole 22, communicates with the second accommodation hole 22 only at the left end, and the right end is separated from the second accommodation hole 22 in the direction of the rotation axis L. ing. Therefore, the side part located in the 2nd accommodation hole 22 side of the right end part of the 4th accommodation hole 24 is not opened, but the 4th accommodation hole 24 which is a part of substantial part of main part 2A (cylinder part 2a). Is closed by a portion 42 adjacent to. As a result, the side portion on the second accommodation hole 22 side of the right end portion of the second support meat portion 32 is connected to the portion 42 and supported by the right end portion of the main body portion 2A via the portion 42.

  As described above, the side portion located on the first accommodation hole 21 side of the left end portion of the first support meat portion 31 is supported by the main body portion 2 </ b> A, and on the second accommodation hole 22 side of the right end portion of the second support meat portion 32. The side part located is supported by the main body part 2A. Moreover, the first support meat portion 31 and the second support meat portion 32 are connected to each other in the circumferential direction of the main body portion 2A. Therefore, the entire first and second support meat portions 31 and 32 are integrally provided in the main body 2A in a both-sided state, that is, the entire first and second support meat portions 31 and 32 are both supported. The main body 2A is supported in a state. Since the first and second support meat portions 31 and 32 in the both-sided state are provided inside the third and fourth accommodation holes 23 and 24, the housing 2 (main body portion 2A) The strength of the housing of the conventional differential gear device for a vehicle in which the side portion inside the four accommodation holes is opened can be greatly improved. Moreover, since it is not necessary to form the partition wall, the entire length of the housing 2 is not increased. Therefore, the differential gear device 1 can be prevented from increasing in size.

  In order to further increase the support strength of the first and second support meat portions 31 and 32 by the main body portion 2A, the differential gear device 1 further employs the following configuration. That is, as shown in FIGS. 2, 8, and 10, the third accommodation hole 23 is formed as a blind hole extending from the left end surface on the opening side of the main body 2A toward the bottom 2b. Therefore, a first end portion 51 that is a substantial part of the main body 2A is formed between the bottom surface of the third accommodation hole 23 and the right end surface of the main body 2A. The first end meat portion 51 is integrally connected to the right end portion of the first support meat portion 31. Therefore, the right end portion of the first support meat portion 31 is supported by the right end portion of the main body portion 2 </ b> A via the first end meat portion 51. Further, the right end portion of the first support meat portion 31 is directly connected to a portion inside the first support meat portion 31 of the bottom portion 2b of the main body portion 2A. Also by this, the right end portion of the first support meat portion 31 is supported by the main body portion 2A. Note that the bottom surface of the third accommodation hole 23 is disposed at substantially the same position as the right end surface of the first sun gear 3 in the rotation axis L direction.

  The fourth accommodation hole 24 is formed as a blind hole extending from the right end surface on the bottom 2a side of the main body 2A toward the opening. Therefore, a second end portion 52 that is a substantial part of the main body 2A is formed between the bottom surface of the fourth accommodation hole 24 and the left end surface of the main body 2A. As for this 2nd end meat part 52, the right end part of the 2nd support meat part 32 is continued in one. Therefore, the left end portion of the second support meat portion 32 is supported by the left end portion of the main body portion 2 </ b> A via the second end meat portion 52. The bottom surface of the fourth accommodation hole 24 is disposed at substantially the same position as the left end surface of the second sun gear 4 in the rotation axis L direction.

  Next, another embodiment of the present invention will be described. In the following embodiment, only the configuration different from the above embodiment will be described, and the same components are denoted by the same reference numerals and the description thereof will be omitted.

  11 to 14 show a second embodiment of the present invention. In this embodiment, the 3rd accommodation hole 23 is formed toward the opening part side from the end surface by the side of the bottom part 2a of 2 A of main bodies. Accordingly, the first end thick portion 51 is formed at the end portion on the opening side of the main body portion 2A. In addition, the bottom surface of the third accommodation hole 23 is disposed at the same position as the bottom surface of the fourth accommodation hole 24 in the rotation axis L direction. Therefore, the 1st end part 51 and the 2nd end part 52 are mutually connected in the circumferential direction of 2 A of main-body parts. As a result, the left end portions of the first and second support meat portions 31, 32 are supported by the main body portion 2A via the first and second end meat portions 51, 52, and the first and second support meat portions 31, The right end part of 32 is supported by the bottom part 2b which continues in a row from them. That is, the first and second support meat portions 31 and 32 as a whole should only be supported by the main body 2A via the portions 41 and 42 adjacent to the third and fourth accommodation holes 23 and 24 at both ends. Instead, it is supported by the main body 2A via the first and second end thick parts 51, 52 and the bottom 2b. Therefore, the support strength of the first and second support meat portions 31 and 32 is further increased, and the strength of the main body portion 2A is further improved.

  15 to 18 show a third embodiment of the present invention. In this embodiment, the fourth accommodation hole 24 is formed from the end surface on the opening side of the main body 2A toward the bottom 2b. Therefore, the 2nd end meat part 52 is formed in the end by the side of bottom 2b. Moreover, the bottom surface of the fourth accommodation hole 24 is disposed at the same position as the bottom surface of the third accommodation hole 23 in the direction of the rotation axis L. Therefore, the 1st end part 51 and the 2nd end part 52 are mutually connected in the circumferential direction of 2 A of main-body parts.

  An annular projecting portion 2f that extends annularly about the rotation axis L is formed on the end surface of the lid portion 2B that faces the main body portion 2A. The outer diameter of the annular projecting portion 2f is substantially the same as the inner diameter of the main body portion 2A (cylinder portion 2a), and is fitted to the end of the main body portion 2A on the opening side without a gap. As a result, the left end portions of the first and second supporting meat portions 31 and 32 are supported by the annular projecting portion 2f. The formation of the annular protrusion 2f on the lid 2B may be applied to the first and second embodiments and the fourth embodiment described below.

  19 to 22 show a fourth embodiment of the present invention. In this embodiment, the third accommodation hole 23 is formed from the end surface on the bottom 2b side of the main body 2A toward the opening side, and the fourth accommodation hole 24 is formed from the end surface on the opening side of the main body 2A to the bottom 2b. It is formed toward the side. Accordingly, the first end thick part 51 is formed at the left end part of the main body part 2A, and the second end thick part 52 is formed at the right end part of the main body part 2A.

  Further, the third accommodation hole 23 has a larger diameter than the circumference where the first and second accommodation holes 21 and 22 are arranged, but on a circumference smaller than the circumference where the fourth accommodation hole 24 is arranged. Has been placed. Moreover, the third accommodation hole 23 is disposed such that its axis is located on a plane P orthogonal to the axis of the first accommodation hole 21 and the axis of the fourth accommodation hole 24. With this arrangement, the outer peripheral surface of the first transfer gear 7 comes into contact with the portion of the inner peripheral surface of the third accommodation hole 23 that contacts the first support meat portion 31, and the first transfer gear 7 is correspondingly increased. The frictional resistance acting between the outer peripheral surface and the inner peripheral surface of the third accommodation hole 24 can be increased. As a result, the differential limiting force that limits the differential rotation of the first and second sun gears 3 and 4 can be increased. Such an effect can be obtained even if the arrangement of the third and fourth accommodation holes 23 and 24 is reversed. That is, the fourth accommodation hole 24 may be arranged on a circumference having a smaller diameter than the circumference where the third accommodation hole 23 is arranged.

In addition, this invention is not limited to said embodiment, In the range which does not deviate from the summary, it can change suitably.
For example, in the above-described embodiment, the main body 2A is constituted by the cylindrical part 2a formed integrally with each other and the bottom 2b provided integrally with the cylindrical part 2a. 2b may be separated, only the cylindrical portion 2a may be the main body portion 2A, and the bottom portion 2b may be the same lid portion as the lid portion 2B. That is, the main body portion 2A may be a cylindrical body having both ends opened, and the both end opening portions of the main body portion may be closed by the lid portion 2B and another lid portion.
In the above-described embodiment, the third and fourth accommodation holes 23 and 24 are blind holes, but may be through holes that open to both end faces of the main body 2A.

It is sectional drawing which follows the XX line of FIG. 3 which shows 1st Embodiment of this invention. It is sectional drawing which follows the YY line | wire of FIG. 3 which shows the same embodiment. It is sectional drawing which follows the XX line of FIG. It is sectional drawing which follows the YY line of FIG. It is a perspective view which notches and shows a part of the embodiment. It is the perspective view which looked at the main-body part of the embodiment from the opening side. It is the perspective view which looked at the main-body part of the embodiment from the bottom side. It is sectional drawing of the main-body part of the embodiment. It is sectional drawing which follows the XX line of FIG. It is sectional drawing which follows the XX line of FIG. It is the perspective view which looked at the main-body part of 2nd Embodiment of this invention from the opening part side. It is the perspective view which looked at the main-body part of the embodiment from the bottom side. It is sectional drawing of the main-body part of the embodiment. It is sectional drawing similar to FIG. 10 which shows the principal part of the same embodiment. It is the perspective view which looked at the main-body part of 3rd Embodiment of this invention from the opening part side. It is the perspective view which looked at the main-body part of the embodiment from the bottom side. It is sectional drawing which shows the housing of the embodiment. It is sectional drawing similar to FIG. 10 which shows the principal part of the same embodiment. It is the perspective view which looked at 4th Embodiment of this invention from the opening part side. It is the perspective view which looked at the same embodiment from the bottom side. It is sectional drawing which follows the XX line of FIG. 22 which shows the principal part of the embodiment. It is sectional drawing similar to FIG. 10 which shows the principal part of the same embodiment.

Explanation of symbols

L Rotational axis 1 Vehicle differential gear device 2 Housing 2A Main body 2B Lid 2b Bottom 2f Annular protrusion 3 First sun gear 4 Second sun gear 5 First planetary gear 6 Second planetary gear 7 First transfer gear 8 2nd transfer gear 21 1st accommodation hole 22 2nd accommodation hole 23 3rd accommodation hole 24 4th accommodation hole 31 1st support meat part (meat part)
32 Second support meat part (meat part)

Claims (6)

A housing having a cylindrical portion centered on the rotation axis, first and second sun gears rotatably supported on the housing around the rotation axis, and rotatable on the housing in parallel with the rotation axis And the first and second planetary gears meshed with the first and second sun gears, respectively, and supported by the housing in parallel with the rotation axis and capable of rotating, and the first and second planetary gears. First and second transfer gears that mesh with each other and mesh with each other, and are arranged in the housing in parallel to the rotation axis and spaced apart from each other in the circumferential direction of the cylindrical portion, in the radial direction of the housing First and second accommodation holes whose inner side portions intersect with the inner peripheral surface of the housing, parallel to the rotation axis, and in the circumferential direction of the housing The side portions adjacent to each other in the circumferential direction of the housing intersect with each other and the side portions spaced apart from each other in the circumferential direction are disposed between the first and second accommodation holes. Third and fourth accommodation holes are formed to intersect the holes, respectively, and the first and second planetary gears are rotatably accommodated in the first and second accommodation holes, respectively, and the third and fourth accommodation holes are provided. In the vehicle differential gear device in which the first and second transfer gears are rotatably accommodated,
The first accommodation hole is formed as a blind hole extending from one end face located on the first sun gear side of the housing toward the other end side,
The second accommodation hole is formed as a blind hole extending from the other end surface located on the second sun gear side of the housing toward one end side,
The third and fourth housing holes are spaced radially outward from the inner circumferential surface of the housing so that a meat portion is formed between the third and fourth housing holes and the inner circumferential surface of the cylindrical portion. Arranged,
The end portion of the third housing hole located on the second sun gear side is the second sun gear side so that the end portion of the meat portion located on the second sun gear side is continuous with the other portion of the housing in the circumferential direction. 1 spaced from the receiving hole in the longitudinal direction,
The end portion of the fourth housing hole located on the first sun gear side is the first sun gear side so that the end portion of the meat portion located on the first sun gear side is continuous with the other portion of the housing in the circumferential direction. 2. A differential gear device for a vehicle, wherein the differential gear device is separated from the housing hole in the longitudinal direction. The housing has a main body part having a bottom part at one end part and an opening at the other end part, and the cylindrical part formed therein, and a lid part for closing the opening part of the main body part. The first sun gear is accommodated in one end portion on the bottom side, and the second sun gear is accommodated in the other end portion inside the main body portion,
The first accommodation hole is formed as a blind hole extending from one end surface located on the bottom side of the main body portion toward the other end side,
2. The vehicle differential gear device according to claim 1, wherein the second housing hole is formed as a blind hole extending from the other end surface located on the opening side of the main body portion toward one end side. . The third accommodation hole is formed as a blind hole extending from one end surface located on the bottom side of the main body portion toward the other end side,
3. The vehicle differential gear device according to claim 2, wherein the fourth accommodation hole is formed as a blind hole extending from one end surface located on the opening side of the main body portion toward the other end side. . The third accommodation hole is formed as a blind hole extending toward the one end side from the other end surface located on the opening side of the main body part,
3. The vehicle differential gear device according to claim 2, wherein the fourth accommodation hole is formed as a blind hole extending from one end surface located on the bottom side of the main body portion toward the other end side. . 3. The vehicle difference according to claim 2, wherein the third and fourth accommodation holes are formed as blind holes extending from one end face located on the bottom side of the main body portion toward the other end side. Dynamic gear device. The vehicular difference according to any one of claims 1 to 5, wherein the lid portion is formed with an annular projecting portion that fits into an end portion of the opening portion of the inner peripheral surface of the main body portion. Dynamic gear device.

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