Differential device

[0024]

[0025]Hereinafter, usefigure 1 The first embodiment will be described with reference to FIG.figure 1 It is a schematic diagram showing a driving system of the vehicle according to the present embodiment,figure 2 It is a cross-sectional view showing a differential device according to the present embodiment,image 3 It is an axial view of the portion of the differential shell body according to the transmission shaft, and is observed from the axial direction of the drive shaft.Figure 4A It is a schematic diagram showing the number of teeth of the first to fourth pinion and the second side gear according to the first embodiment,Figure 4b It is a diagram for explaining the amplitude of the second side gear relative to the second differential housing according to the first embodiment.

[0026][Structure of vehicle drive system]

[0027]First, usefigure 1 The structure of the drive system of the vehicle 100 mounted by the differential device 1 according to the present embodiment will be described. Such asfigure 1 As shown, the vehicle 100 is, for example, an engine output shaft such as an FF (front engine, front wheel drive) type relative to the vehicle traveling direction, and is configured to include an engine 101 as a drive source; the output of the engine 101 Rotate the transmission shaft 131, 132, 133 that drives the differential device 1 of the automatic transmission 102; transmitting the rotation from the differential device 1 via the transmission shaft 131; The wheel 120L on the left side; and the wheel 120R from the right side of the rotation from the differential device 1 is transmitted via the drive shafts 132, 133. Further, the drive shaft 132 is supported, for example, the center bearing 110 of the engine 101 is supported as a rotary free and cannot move axially. Further, the central bearing 110 may not be fixed to the engine 101, and is fixed to the frame of the vehicle body or the like.

[0028]The automatic transmission 102 encloses oil in the inside, and the oil pressure regulation generated by the oil pump (not shown) inhalation of the oil is lubricated as a lubrication pressure, and the transmission mechanism 103 as a power transfer mechanism, The differential device 1 is supplied. In detail, the differential device 1 to be described later is composed of a so-called open type differential device that is sealed by inserting the drive shafts 131, 132. Further,, for example, a differential device for lubricating the grease or the like, since the oil of the automatic transmission 102 is a lubricant, the differential device 1 having a higher lubrication performance is achieved, and durability is achieved. improve.

[0029]When manufacturing the driving system of the vehicle 100, the engine 101 is disposed on the frame of the vehicle body by a engine frame or the like, the engine frame, or the like, and has an automatic transmission having a differential device 1 in a state where the drive shaft 132 is assembled in the center bearing 110. 102 is assembled relative to the engine 101, and the drive shaft 132 is inserted into the differential device 1. Thereafter, the drive shaft 133 is driven to the drive shaft 133, and the drive shaft 131 is driven to be driven in the differential device 1. Further, the wheels 120L, 120R are mounted relative to the rotor hub driven by the drive shafts 131, 133.

[0030][Structure of the differential device]

[0031]Thenfigure 2 andimage 3 The structure of the differential device 1 will be described. Such asfigure 2 As shown, the differential device 1 is configured to have a substantially: with the automatic transmission 102 (seefigure 1 The intermediate shaft drive of the shifting mechanism 103 drives the differential ring gear 40; the differential ring gear 40 is fixed to the differential housing 10; and the differential mechanism 14 in which the inner package is in the differential housing 10.

[0032]The differential ring gear 40 is configured to be formed in the drive shafts 131, 132 (refer tofigure 1 The axial center is also the center of the third shaft AX3, and has a tooth portion 43 having a tooth surface 41 in the outer peripheral side; and a short thickness of the length of the tooth 43. In the hollow disk-shaped hollow circular plate portion 44 extending to the inner peripheral side of the tooth portion 43, and is configured to become a T-shaped when the tooth portion 43 and the hollow disk portion 44 are cross-sectional. The tooth surface 41 is configured to be a position 41a recessed between the plurality of teeth to become the most in the inner peripheral side. Further, the differential ring gear 40 is fitted to the end surface 12e formed by the end face 40a of the inner peripheral side of the hollow circular plate portion 44 constituting the outer peripheral side of the second differential case 12 of the differential housing 10 described later. Further, the through hole 40b having a bolt 91 can penetrate in the hollow disk portion 44, and is integrally fixed by the differential housing 10 having a bolt 91 relative to the following.

[0033]The differential housing 10 is configured to be substantially: a first differential housing 11 of the hollow cylinder, the inner package differential mechanism 14; and the hollow disk-shaped second differential case 12, which is related to the first differential The shell 11 is integrated and the differential mechanism 14 is enclosed. In detail, the differential housing 10 passes through the bolt 91 through the through hole 12a formed in the second differential case 12 and the outer thread of the bolt 91 in the bolt hole 11a formed on the first differential case 11. The inner thread of the bolt hole 11a is thus fixed with the differential ring gear 40 described above to be integrated as a differential case 10.

[0034]Further, a bearing B2 is disposed between the second differential case 12 and the casing (not shown) of the automatic transmission 102, and the housing of the first differential housing 11 and the automatic transmission 102 (not shown) A bearing B1 is disposed, i.e., the differential housing 10 is rotatably rotated as the housing (not shown) relative to the automatic transmission 102. Further, in the case where the housing of the automatic transmission 102 is formed, the oil passage 150 that is discharged as the discharge port is provided, and is configured to facilitate the through hole 12D formed from the second differential case 12 toward the differential mechanism. 14 is supplied as indicated by arrow A and supplies lubricants to the interior of the differential mechanism 14.

[0035]The above differential mechanism 14 is configured to be substantially: the first pinion shaft 21, the second pinion shaft 22 (seeimage 3 ), The third small gear shaft 23 (refer toimage 3 ), The first pinion gear 31, the second pinion 32, the third pinion 33 (seeimage 3 ), Fourth pinion 34 (refer toimage 3 ), The first side gear 51, the second side gear 52, and the holding member 70.

[0036]The first pinion shaft 21 is fitted to the support holes 11H1, 11H2 formed at the first differential housing 11 and supports both ends and is inserted into the pin formed in the first differential housing 11, 11b, 11c. 82 is defensive, and is disposed on the first shaft Ax1 in the positional relationship between the third axis AX3 and the second axis Ax2 to be described later, that is, the first pinion shaft 21 is disposed on the first axis AX1. The inside of the superster shell 10. Further, the first pinion gear 31 is rotatably supported by the outer circumference of the first pinion shaft 21 as the second pinion 32. Further, the first differential housing 11 is fastened to the second differential case 12 bolt 91, so that the pin 81, 82 is formed in the pressing portion 12b of the second differential case 12 relative to the first differential speed. The shell 11 is pressed against off.

[0037]In addition, ifimage 3 As shown, the second pinion shaft 22 is fitted to the support hole (not shown) formed at the first differential housing 11 and supports one end and is inserted into the hole 11d formed in the first differential housing 11. Pin 83 anti-off. Further, the third pinion shaft 23 is fitted to a support hole (not shown) formed at the first differential housing 11 and is supported by the pin formed in the hole 11e formed in the first differential housing 11. 84 anti-off. Further, the second pinion shaft 22 and the third pinion shaft 23 are disposed on the second axis AX2 at the positional relationship orthogonal to the first axis Ax1 and the third axis Ax3, and is separated from the second axis AX2. The pinion shaft 21 is disposed on both sides. Further, the third pinion 33 rotates from the outer circumference of the second pinion shaft 22, and the fourth pinion gear 34 is rotatably supported from the outer circumference of the third pinion shaft 23. Further, in the same manner, the first differential case 11 is fastened to the second differential case 12, so that the pin 83, 84 is formed in the pressing portion 12b of the second differential case 12 relative to the first The differential housing 11 is pressed against off.

[0038]Further, at the outer circumference of the first pinion shaft 21, between the first pinion gear 31 and the second pinion 32 in the direction of the first shaft Ax1, and the outer circumference of the other end of the second pinion shaft 22 and the first In the outer circumference of the other end of the three-pinglass shaft 23, the third pinion 33 and the fourth pinion 34 in the direction of the second axis Ax2 are arranged in detail the holding member 70 described later.

[0039]On the other hand, ifimage 3 As shown, the first pinion gear 31 is formed in detail the tapered teeth 31a of the teeth described later, and the second pinion gear 32 is formed in detail a tapered teeth 32a which will be described later. Further, in the third pinion gear 33, a tapered teeth 33a having a teeth will be described later, and the fourth pinion 34 is formed in detail a taper teeth 34a which will be described later. In turn, iffigure 2 As shown, in the above taper teeth 31a, 32a, 33a, 34a, from the axial side of the first shaft Ax1 (for the engine 101 side, for example, toward the travel direction of the vehicle 100 in the travel direction of the vehicle 100 in the direction of travel direction of the vehicle 100 in the axial side 51a of the first side gear 51 (side, for example toward the vehicle 100). The first side gear 51 is disposed in the meshing manner. Further, in the above tapered teeth 31a, 32a, 33a, 34a, the respective axis of the first shaft Ax1 (opposite to the engine 101, for example, toward the travel direction of the vehicle 100, for example, toward the travel direction of the vehicle 100 in the direction of travel of the vehicle 100 in the axial direction of the first shaft Ax1 (opposite to the engine 101) The second side gear 52 is disposed in the left side).

[0040]The first side gear 51 and the second side gear 52 each have fitting holes 51H, 52H fitted to the drive shafts 131, 132, respectively. In detail, a spline 51S is formed on the circumferential surface of the fitting hole 51h, and the spline (not shown) of the transmission shaft 132 is inserted into the first side gear via the through hole 11h formed at the first differential housing 11 by the spline of the transmission shaft 132. 51 The spline 51S is spline-fitted and is driven. Further, a groove 51D is formed on the circumferential surface of the fitting hole 51h, and the groove 51d is engaged with the snap ring (not shown) mounted to the drive shaft 132 to perform anti-off. In still further, the spline 52S is formed on the circumferential surface of the fitting hole 52h, and the spline (not shown) of the transmission shaft 131 is inserted into the second side gear via the through hole 12H formed at the second differential case 12. 52 The spline 52s of 52 is spline-fitted and is driven. Further, in the same manner, a groove 52d is formed on the circumferential surface of the fitting hole 52h, and the groove 52d is engaged with the snap ring (not shown) mounted to the transmission shaft 131, and the transmission shaft 131 relative to the second side gear 52 Take off. Thereby, the first side gear 51 is driven to the right wheel 120R drive, and the second side gear 52 is driven with the wheel 120L on the left. Further, as described above, the difference vessel device 1 is inserted into the sealing state of the oil through the drive shafts 131, 132 to the fitting holes 51H, 52H.

[0041]Further, the first side gear 51 is disposed between the first side gear 51 and the first differential housing 11 in the direction of the third axis Ax3, and the first side gear 51 is facing the first to The fourth pinion 31, 32, 33, 34 is biased. Similarly, a cylindrical portion 12c extending in a direction in which the third shaft AX3 is formed in the second differential case 12, and the second side gear 52 in the direction of the third shaft Ax3 and the second differential shell 12 A disc type spring 62 as a second force member 12c is disposed between the cylindrical portion 12c, and the second side gear 52 is engaged toward the first to fourth pinions 31, 32, 33, 34. Thereby, the engagement portion between the first side gear 51 and the second side gear 52 and the first to fourth pinions 31, 32, 33, 34 is pressurized, and the setting of differential restrictions can be made, and it is realized. The decrease in the gap has improved the direct stability of the vehicle 100.

[0042]On the other hand, the holding member 70 has a peripheral wall 70a formed as a cylindrical shaped circumference, and four through holes including through holes 70H1, 70H2 including the first pinion shaft 21 insertion. . That is, the second pinion shaft 22 and the third pinion shaft 23 are inserted into two through holes not shown in the holding member 70, that is, the holding member 70 is configured to support the first to each other by four through holes. The third pinion shaft 21, 22, 23, in particular the second pinion shaft 22 and the third pinion shaft 23 becomes a configuration such as the first differential housing 11 and the holding member 70 dual support. Therefore, the first to third pinion shafts 21, 22, 23 of the first to third pinion shafts 21, 22, 23 are reinforced by the supporting member 70 of the first to third pinion shafts 21, 22, 23.

[0043]Further, the retaining member 70 has a side wall 70b connected in such a manner of the side end portion of the blocking peripheral wall 70a, and a drive shaft 131 is formed on the inner peripheral side of the side end portion of the other side of the peripheral wall 70a.figure 1 ) The through hole 70H3 which can penetrate as the axial hole.

[0044]The holding member 70 constituting thus is required to form a processed such a through hole 70H1, 70H2, 70H3, and thus is less likely to be hardened, but since there is a side wall 70b connected in a side end portion of the blocking peripheral wall 70a, Therefore, the structure of the structural body is strong, and since the support strength of the first to third pinion shafts 21, 22, 23 increases, the support accuracy of the first to fourth pinions 31, 32, 33, 34 is improved, so the gear is realized. The decrease in noise, and the increase in durability.

[0045]Further, when the transmitters 131, 132 are fitted to the differential device 1, i.e., when the automatic transmission 102 is assembled to the vehicle 100, the drive shaft 132 is inserted into the fitting hole 51h of the first side gear 51, but the drive shaft 132 is as described above. That is, the center bearing 110 is supported in the axial movement (positioned), when the automatic transmission 102 is in place with the engine 101, there is no concern that the transmission shaft 132 collides with the side wall 70b of the holding member 70, does not deform the holding member 70 Worry.

[0046]On the other hand, when the transmitting shaft 131 is inserted into the second side gear 52, since the transmission shaft 131 is not positioned in the axial direction, it is inserted until the first pinion shaft 21 is inserted, but with the maintenance The component 70 is different, and since the first pinion shaft 21 can be hardened by the hardening treatment of the quenching, the first pinion shaft 21 is higher than the intensity of the holding member 70, and there is no concern for the first pinion shaft 21. Therefore, there is no sidewall on one side of the second side gear 52 of the holding member 70, and there is a through hole 70H3, so that the deformation of the retaining member 70 is not generated.

[0047]Further, as described above, an oil passage 150 is formed in the housing of the automatic transmission 102, and the lubricating oil is enforced from the through hole 12D formed in the second differential case 12 toward the differential mechanism 14. The lubricant is supplied to the inside of the holding member 70 by a through hole 70H3 in the retaining member 70, and when the retaining member 70 is rotated when the vehicle 100 is traveling, the inner surface of the side wall 70b is rotated in the outer surface of the inner surface of the side wall 70b when the vehicle 100 is traveling. guide. Therefore, the lubricating oil is guided from the inside of the holding member 70 toward the four through holes (including through holes 70H1, 70H2), and can be between the through holes and the first to third small gear shafts 21, 22, 23, first To the third pinion shaft 21, 22, 23 and the first to fourth pinions 31, 32, 33, 34, further first to fourth small gears 31, 32, 33, 34 and the first and second The meshing portion between the side gears 51, 52 is supplied to the lubricating oil. Therefore, the side wall 70b of the retaining member 70 has a function of which is a receiver of the lubricating oil and a guide to guiding the lubricating oil to the outer peripheral side, and can improve the lubrication performance of the differential device 1.

[0048]The differential device 1 constructed as above is coupled due to the differential ring gear 40 and the differential case 10 is integrally fixed, so if the rotary is input to the differential ring gear 40, the differential housing 10 remains rotated. The first to third pinion shafts 21, 22, 23 are also rotated integrally with the differential housing 10. The first to third pinion shafts 21, 22, 23 rotate the first to fourth pinions 31, 32, 33, 34, and when the first and second side gears 51, 52 have a difference in rotation Next, the first to third pinion shafts 21, 22, 23 are rotated and differentially rotated, and the first to fourth pinions 31, 32 are transmitted to the first and second side gears 31, 32, The public rotation of 33, 34. Thereby, rotation is transmitted to the left right wheel via the drive shafts 131, 132, 133.

[0049][About the number of teeth of the pinion and the number of teeth of the side gear]

[0050]Next, the vibration of the side gear caused by the relationship between the teeth of the pinion (PG) and the teeth of the side gear (SG) will be described. First, as a first comparative example, the number of teeth of the side gear 252 is even (e.g., 16) and the number of teeth of the pinion 231, 232 is also an even number (e.g., 10).Figure 6A andFigure 6B Can't explain. Further, in the first comparative example, the differential device includes two pinions 231, 232, and the two pinions 231, 232 are arranged in a straight line along the axial direction.

[0051]In the first comparative example, ifFigure 6A As shown, since the number of teeth of the side gear 252 is an even number, the number of teeth of the two pinions 231, 232 is also an even number, and thus, in the case where one of the teeth of the side gear 252 facing the center of the pinion 231, the teeth of the side gear 252 Another center towards the center of the pinion 232. Therefore, such asFigure 6B As shown, when the driving force is rotationally transmitted from the two pinions 231, 232 to the side gear 252, the side gear 252 is pressed against one side of the drive shaft 131, i.e., the side spring 62 is compressed. In the case where the movement is performed, the phase of the side gear 252 and the pinion position X1 of the pinion gear 231 becomes the phase of the pressing PX1 and PX2 at the meshing position X2 of the pinion gear 232 into the same phase. Therefore, the side gear 252 is not inclined with respect to the axial direction of the drive shaft 131, but the amplitude W2 of the axial vibration that is rotated by the side gear 252 becomes large.

[0052]Further, in order to facilitate the explanation, the engagement positions X1, X2 show a point, in order to facilitate simplification of the principal center, particularly, is not limited to the position of the power by engaged to each other by meshing.

[0053]Next, as a second comparative example, the number of teeth of the side gear 352 is an odd number (e.g., 13) and the number of teeth of the pinion 331, 332 is also odd (e.g., 9), usingFigure 7A andFigure 7bCan't explain. Further, in the second comparative example, the differential device includes two pinion gears 331, 332, and the two pinions 331, 332 are arranged in the straight line along the axial gear 352.

[0054]In the second comparative example, ifFigure 7A As shown, since the number of teeth of the side gear 352 is odd, the number of teeth of the two pinions 331, 332 is also odd, and thus, in the case where one of the teeth of the side gear 352 facing the center of the pinion 331, the teeth of the side gear 352 Which of the other tooth is not facing the center of the pinion 332. Therefore, such asFigure 7bAs shown, when the driving force is rotationally transmitted from the two pinion 331, 332 to the side gear 352, the side gear 352 is pressed toward the side of the drive shaft 131, i.e., on one side of the disc slit spring 62. In the case of moving, the phase of the side gear 352 and the pinion position X1 of the pinion gear 331 and the pressing position X2 of the pinion 332 and the pinion position X2 of the pinion gear 332 becomes the phase of 180 degrees. Therefore, the amplitude W3 of the axial vibration accompanying the rotation of the side gear 352 becomes smaller than the amplitude W2 of the first comparative example, but the side gear 352 is inclined with respect to the axial direction of the drive shaft 131, becoming a so-called shaking head. status.

[0055]Next, the number of teeth of the first to fourth pinions 31, 32, 33, 34 in the first embodiment will be described with the number of teeth of the second side gear 52. Further, in the following description, in order to distinguish the second embodiment will be described later, in the first embodiment, the subscript is added to the first to fourth pinion 31.1321, 331341, Second side gear 521. Further, in the following description, the first to fourth pinion 311321, 331341With the second side gear 521The meshing between the examples, of course, of course, the first to fourth small gears 311321, 331341The meshing between the first side gear 51 is also the same.

[0056]In the first embodiment, such asFigure 4A As shown, the second side gear 521The number of teeth is 4N + 2, in other words, the multiple of the four times, in particular, the number of teeth is constituted by 14. In addition, the first to fourth small gears 311321, 331341The number of teeth is odd by the same number, and is configured to block the second side gear 52.1The number of teeth divided by the first to fourth pinion 311321, 331341The value obtained by the number of teeth is not integrated (except), and the specific tooth number is composed of 9.

[0057]Therefore, in the second side gear 521One tooth in a toothed head towards the first pinion 311In the case of the center, the second side gear 521The other tooth in the teeth toward the second pinion 321Center, while on the side gear 521One of the teeth toward the third pinion 331In the case of the center, the second side gear 521Tooth in another toward the fourth pinion 341center of.

[0058]Therefore, such asFigure 4b As shown, when the driving force is passed from the first to fourth pinion 311321, 331341To the second side gear 521When rotating, the second side gear 52 is passed1In the case where the second side gear 52 is pressed against one side of the drive shaft 131, i.e., on one side of the disc type spring 62.1With the first pinion 311Meshing position x1 and second side gear 521With the second pinion 321The phase of pressing Px1 and PX2 at the engaging position X2 becomes the same phase, and the second side gear 521With the third pinion 331Meshing position Y1 and second side gear 521With the fourth pinion 341The phase of the pressing position Y2 at the meshing position Y2 becomes the same phase, but the phase of pressing the pressure Px1, the PX2 is opposite phase, and the phase of pressing PY1, PY2 is opposite.

[0059]Therefore, as a second side gear 521The overall pressure, pressing pressure PX1, PX2 and pressing pressure PY1, and PY2 becomes a relationship with each other, and pressing pressure Px1 and pressing pressure Px2 in relative to the second side gear 52.1The center symmetrical position, and pressing the pressure PY1 and pressing the pressure PY2 in relative to the second side gear 521The center symmetrical position, therefore on the second side gear 52 with average positional relationship1The circumferential action pressing PX1, PX2, PY1, PY2, not in the second side gear 521Produces the force in the tilt direction. Therefore, the second side gear 521It is not inclined with respect to the axial direction of the drive shaft 131 to prevent the generation of the shaking head, accompanied by the second side gear 521The amplitude W1 of the rotating axial vibration is reduced compared to the amplitude W2 of the first comparative example.

[0060]In addition, in the second side gear 521The number of teeth divided by the first to fourth pinion 311321, 331341When the value of the number of teeth is integrated (for example, the number of teeth of the pinion is 7, the number of teeth of the side gear is 14, etc.), and the same teeth are repeatedly crimped in each other after the pinion is rotated, and the same teeth are repeatedly pressed against each other. When the manufacturing error, the adhesion of foreign matter produces a bump, there is a concern that is only applied to the same meshing site. However, since the second side gear 52 is configured1The number of teeth divided by the first to fourth pinion 311321, 331341The value obtained by the number of teeth is not an integer, so the same teeth are not only crimpedyn each other, that is, the meshing portion transfer, the overall load is dispersed, so that the increase in durability can be achieved.

[0061]Further, in order to facilitate the description, the engagement positions X1, X2, Y1, Y2 are shown in order to facilitate the description, and is the case where the general center simplified by the force that engages the force of each other, especially It is not limited to the location of this point.

[0062]

[0063]Next, regarding the second embodiment of the above-described first embodiment has been usedFigure 5 Can't explain.Figure 5 It is a schematic diagram showing the number of teeth of the first to fourth pinion and the second side gear according to the second embodiment. Further, in the description of the second embodiment, the same portions as those of the first embodiment are labeled, and the description thereof will be omitted.

[0064]The differential device 1 according to the second embodiment changes the second side gear 52 as compared with the first embodiment.2The number of teeth. That is, ifFigure 5 As shown, the second side gear 52 is similarly2The number of teeth is 4N + 2, which is an even number of multiple numbers of 4, and the specific tooth is composed of 18. In addition, the first to fourth small gears 312322, 332342The number of teeth is odd by the same number, specifically, the number of teeth is composed of 9.

[0065]In a second embodiment like this, as a second side gear 522The overall pressure, pressing pressure PX1, PX2 and Pressure PY1, PY2 becomes a relationship between each other with each other (seeFigure 4b ), And pressing pressure PX1 and pressing pressure PX2 in relative to the second side gear 522The center symmetrical position, and pressing the pressure PY1 and pressing the pressure PY2 in relative to the second side gear 522The center symmetrical position, so the second side gear 52 can be related to the equal relationship2The circumferential action pressing PX1, PX2, PY1, PY2, not in the second side gear 522Produces the force in the tilt direction. Therefore, the second side gear 522It is not inclined with respect to the axial direction of the drive shaft 131 to prevent the generation of the shaking head, accompanied by the second side gear 522The amplitude W1 of the rotating axial vibration is reduced compared to the amplitude W2 of the first comparative example.

[0066][Summary of the first and second embodiments]

[0067]This differential device (1) has:

[0068]The differential housing (10) is transmitted from the power transfer mechanism (103);

[0069]A plurality of pinion shafts (21, 22, 23) are supported by the differential housing (10) and is disposed in the first axis (AX1) and the second in the first axis (AX1). Axis (AX2);

[0070]The plurality of pinion shafts (21, 22, 23) are respectively rotatably, such as a first pinion (31) and a second pinion (32) disposed on the first shaft (AX1), respectively. The third pinion (33) and the fourth pinion (34) on the second shaft (AX2) are; and

[0071]The first side gear (51) and the second side gear (52) are respectively described above in the third axis (AX3) orthogonal to the first axis (AX1) and the second axis (AX2). The fourth pinion (31, 32, 33, 34) is engaged, and the drive shaft (131, 132) is driven to be driven, and the direction toward the third axis (AX3) towards the first to the first to The four-pinion (31, 32, 33, 34) is pre-loaded.

[0072]The number of teeth of the first side gear (51) and the second side gear (52) is formed to be 4N + 2, and N is set to an integer.

[0073]Thereby, there is a press-based pressure oscillating based on the preloading force and transmitting driving force between the first side gear 51 and the second side gear 52 and the first to fourth pinions 31, 32, 33, 34. Worried, but the first pinion gear 31 and the second pinion 32 mesh with the first side gear 51 and the second side gear 52 with the third pinion 33 and the fourth pinion 34 and the first side gear 51 and the second The phase of the side gear 52 engages the phase in opposite phases, and it is possible to prevent the head state from moving the head, and can reduce the amplitude of the first side gear 51 and the second side gear 52 vibration.

[0074]Further, this differential device (1) includes a first force component (61) and a second force component (62),

[0075]The first force member (61) and the second urging member (62) face the first side gear (51) and the second side gear (52) toward the first to fourth pinion (31, 32, " 33, 34) Shiring, thereby performing the above preload.

[0076]Thereby, the engagement portion between the first side gear 51 and the second side gear 52 and the first to fourth pinions 31, 32, 33, 34 is pressurized, so that the setting of differential restrictions can be performed, and it is achieved The decrease in the gap can also improve the direct stability of the vehicle 100.

[0077]In addition, this differential device (1) is configured.

[0078]The number of teeth of the first to fourth pinions (31, 32, 33, 34) is respectively constructed, and the number of teeth of the first side gear (51) and the second side gear (52) will be described above. The value obtained by one to the fourth pinion (31, 32, 33, 34) is not integer.

[0079]Thereby, for example, in the case where the value of the teeth of the first side gear (and the second side gear) is divided by the value of the number of teeth of the first (to fourth) pinion, the pinion is rotated with the side gear. The teeth are engaged with each other, and there is only a concern to apply a load on the same meshing site, but for example, the number of teeth of the first side gear (and the second side gear) is divided by the number of teeth of the first (to fourth) pinion. Not an integer, so when the first to fourth pinions 31, 32, 33, 34 are rotated from the first and second side gears 51, 52, it is prevented from being applied only to the same meshing portion, and the overall load is dispersed. Therefore, the increase in durability can be achieved.

[0080]Moreover, for this differential device (1),

[0081]The number of teeth of the first to fourth small gears is 9,

[0082]The first side gear and the number of teeth of the second side gear are 14.

[0083]Thereby, it is possible to provide a differential device that prevents the shamping head state and reduces the amplitude of the first side gear 51 and the second side gear 52 vibration.