JP2011153680A - Power transmission device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a power transmission device allowing suppression of an increase of a radial direction size and miniaturization of an axial direction size. <P>SOLUTION: This power transmission device 1 includes a first shaft 3, a second shaft 5, a first gear 7, a second gear 9, a pair of bevel gears 11 constituted of the first gear 7 and the second gear 9 to transmit driving force by changing the direction of the driving force between the first shaft 3 and the second shaft 5, and a casing 13 for storing the first shaft 3, the second shaft 5 and the pair of the bevel gears 11. The casing 13 is constituted of a casing main body 15, a cover body 17 and a bearing supporting body 19 to store lubricating oil therein. The casing main body 15 includes a fitting surface 21 with the bearing supporting body 19. The fitting surface 21 includes an oil groove 23 communicated with the inside of the casing 13. The bearing supporting body 19 includes an oil hole 25 communicated with the oil groove 23. The oil groove 23 is communicated with a filler hole 27 for introducing the lubricating oil into the casing 13. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a power transmission device applied to a vehicle.

  Conventionally, as a power transmission device having a casing that houses a power transmission mechanism including an input / output shaft and an input / output gear, a hollow shaft as an input shaft, a drive shaft as an output shaft, a hollow shaft and a drive shaft There is known one provided with a ring gear and a drive pinion provided as input / output gears, and a transfer case for accommodating each member (see, for example, Patent Document 1).

  In this power transmission device, the transfer case is divided into three parts such as a case main body that accommodates each member, a cover body that closes the inside of the case main body, and a bearing support that supports the bearing that supports the drive shaft. The cover body and the bearing support body are fixed to the case body by a fixing means such as a bolt.

  In such a power transmission device, a sufficient lubrication structure is not provided on the bearing support side on which the drive shaft is disposed. Therefore, the support portion and the sliding portion of the drive shaft are made of lubricating oil sealed in the transfer case. It was difficult to reliably lubricate.

  Therefore, there is known a structure in which a lubricating structure is provided on a cylindrical member as a bearing support on the side where a drive pinion as an output shaft of a transfer case is disposed (see, for example, Patent Document 2).

  In this power transmission device, the cylindrical member is provided with a hole that communicates with the outer peripheral side and the inner peripheral side, and lubricating oil flowing from the outer peripheral side of the cylindrical member lubricates the support portion and the sliding portion on the inner peripheral side of the cylindrical member. I try to let them.

JP 2009-115309 A Japanese Patent Laid-Open No. 2004-314796

  However, in the power transmission device as in Patent Document 2, the structure is complicated by providing a hole in the bearing support, but the lubricating oil is scraped up by the rotation of the ring gear and pinion. Is difficult to flow into the outer periphery of the bearing support.

  For this reason, if sufficient lubricating oil does not flow into the outer peripheral side of the bearing support, the lubricating oil cannot be sufficiently supplied to the inner support side or sliding part of the bearing support, and the lubricity is reduced. It was falling.

  Accordingly, an object of the present invention is to provide a power transmission device capable of improving the lubricity on the bearing support side in the casing.

  According to the first aspect of the present invention, a first shaft that is formed in a hollow shape and is inserted into the shaft center so that the axle is relatively rotatable, and the shaft center is disposed so as to intersect the shaft center of the first shaft. Two shafts, a first gear provided to be rotatable integrally with the first shaft, a second gear provided to be rotatable integrally with the second shaft, and parallel to the first gear or the first shaft. An umbrella that includes an intermediate gear and a second gear that are provided so as to be integrally rotatable on a disposed intermediate shaft, and that can change the direction of the driving force transmitted between the first shaft and the second shaft and transmit the umbrella. A gear set; a casing that houses the first shaft, the second shaft, and the bevel gear set; and the casing is fitted to the casing body that supports one end side of the first shaft. A cover body that is fixed together and supports the other end of the first shaft, and is fitted into the casing body. And a bearing support that supports the second shaft and accommodates lubricating oil therein, wherein the casing body is provided with a fitting surface with the bearing support. The fitting surface is provided with an oil groove communicating with the inside of the casing, the bearing support is provided with an oil hole communicating with the oil groove, and the lubricating oil is supplied to the casing in the oil groove. Filler holes to be introduced into the inside are communicated.

  In the power transmission device according to the first aspect, the casing body is provided with a fitting surface with the bearing support, and the fitting surface is provided with an oil groove communicating with the inside of the casing. The oil groove can be formed on the casing main body side so that the oil groove shape can be set as freely as possible, and the lubricating oil can be effectively flowed. In addition, it is possible to suppress the reduction of the support area of the support surface of the bearing support, increase the support stability of the bearing support, and reduce the meshing vibration of the bevel gear set.

  Also, since the bearing support body is provided with an oil hole communicating with the oil groove, the lubricating oil that has flowed into the oil groove can be reliably supplied to the oil hole. The parts can be reliably lubricated.

  Further, since the filler hole for introducing the lubricating oil into the casing is communicated with the oil groove, the lubricating oil can be introduced into the casing using the lubricating oil groove from the filler hole, and the oil groove The lubricating oil is reliably supplied also into the oil hole, and the lubricity can be further improved.

  Therefore, the lubricity on the bearing support side in the casing can be improved.

It is the schematic which shows the motive power system of a vehicle. It is a perspective view of the casing of the power transmission device concerning a 1st embodiment of the present invention. It is sectional drawing of the power transmission device which concerns on 1st Embodiment of this invention. It is sectional drawing of the power transmission device which concerns on 1st Embodiment of this invention. It is a bottom view of the casing of the power transmission device according to the first embodiment of the present invention. It is sectional drawing of the power transmission device which concerns on 2nd Embodiment of this invention. It is sectional drawing of the power transmission device which concerns on 3rd Embodiment of this invention. It is sectional drawing of the power transmission device which concerns on 4th Embodiment of this invention.

  First, an example of a vehicle power system to which a power transmission device according to an embodiment of the present invention is applied will be described with reference to FIG. In addition, although it is set as the power system which applied the power transmission device 1 which concerns on 1st Embodiment here, the power transmission device which concerns on other embodiment may be applied similarly to the power transmission device 1 of 1st Embodiment. it can.

  As shown in FIG. 1, the power system of the vehicle includes a drive source such as an engine 401 and an electric motor 403, a planetary gear type transmission 405 as a speed change mechanism, and a front that allows differential of the left and right wheels on the front wheel side. A differential 407, front axles 409 and 411, front wheels 413 and 415, a power transmission device 1, a propeller shaft 417, and a coupling 419 that intermittently controls driving force transmitted from the front wheel side to the rear wheel side. The rear differential 421 that allows the differential of the left and right wheels on the rear wheel side, the rear axles 423 and 425, the rear wheels 427 and 429, and the like. In the vicinity of the transmission 405, an electric motor 431 for shifting and driving is connected to the transmission 405.

  The driving force of the driving source is transmitted from the transmission 405 to the pinion 435 via the differential case 433 of the front differential 407, and is connected to a pair of side gears 437 and 439, output shafts 443 and 445, constant velocity drive joints 447 and 449, front axles 409, 411, distributed from the constant velocity drive joints 451, 453 to the front wheels 413, 415, branched to the first shaft 3 connected to the differential case 433, and transmitted to the power transmission device 1.

  The driving force transmitted to the power transmission device 1 is generated from the first gear 7 that rotates integrally with the first shaft 3 through which the output shaft 445 passes through the shaft center side, and the second gear 9 that rotates integrally with the second shaft 5. Is output from the first shaft 3 side to the second shaft 5 side via the bevel gear set 11 and transmitted to the coupling 419 via the propeller shaft 417. The driving force transmitted to the coupling 419 is transmitted to the rear differential 421 when the coupling 419 is connected, and is distributed from the rear axles 423 and 425 to the rear wheels 427 and 429 so that the four-wheel drive state of front and rear wheel driving is achieved. Become. When the connection of the coupling 419 is released, the vehicle enters a two-wheel drive state of front wheel drive. Hereinafter, the power transmission device will be described.

  A power transmission device according to an embodiment of the present invention will be described with reference to FIGS.

(First embodiment)
The first embodiment will be described with reference to FIGS.

  The power transmission device 1 according to the present embodiment includes a first shaft 3 that is formed in a hollow shape and into which an output shaft 445 (see FIG. 1) is inserted so as to be relatively rotatable, and an axis of the first shaft 3. The second shaft 5 is disposed so that the shaft centers intersect with each other, the first gear 7 provided so as to be integrally rotatable with the first shaft 3, and the second gear 5 provided so as to be integrally rotatable with the second shaft 5. A bevel gear set 11 comprising a gear 9, a first gear 7 and a second gear 9, capable of changing the direction of the driving force transmitted between the first shaft 3 and the second shaft 5 and transmitting the first driving force; A casing 13 that accommodates the shaft 3, the second shaft 5, and the bevel gear set 11 is provided.

  The casing 13 includes a casing body 15 that supports one end side of the first shaft 3, a cover body 17 that is fitted and fixed to the casing body 15 and supports the other end side of the first shaft 3, It comprises a bearing support 19 that is fitted and fixed to the casing body 15 and supports the second shaft 5, and contains lubricating oil therein.

  The casing body 15 is provided with a fitting surface 21 with the bearing support 19, and the fitting surface 21 has an oil groove 23 with one end communicating with the inside of the casing 13 along the fitting direction on the outer peripheral side. The bearing support 19 is provided with an oil hole 25 communicating with the oil groove 23, and the oil groove 23 is communicated with a filler hole 27 for introducing lubricating oil into the casing 13.

  2-5, the 1st axis | shaft 3 is formed in the hollow shape, and is rotatably supported by the casing main body 15 and the cover body 17 of the casing 13 via the bearings 29 and 31. As shown in FIG. A spline-shaped connecting portion 33 is formed on the outer periphery of one axial end portion of the first shaft 3. A differential case 433 (see FIG. 1) of the front differential 407 is coupled to the coupling portion 33 so as to be integrally rotatable, and a driving force is input to the first shaft 3. Further, on the inner peripheral side of the first shaft 3, an output shaft 445 (see FIG. 1) and a front gear 411 (see FIG. 1) that connect the side gear 439 (see FIG. 1) of the front differential 407 to be rotatable relative to the first shaft 3. 1) is inserted. The driving force input to the first shaft 3 is output to the second shaft 5.

  The second shaft 5 is disposed in a direction in which the shaft center intersects with the shaft shaft of the first shaft 3, specifically in a direction orthogonal thereto, and is rotatably supported by the bearing support 19 of the casing 13 via the bearing 35. Has been. A spline-shaped connecting portion 37 is formed on the outer periphery of one end portion of the second shaft 5 in the axial direction, and the output member 39 is connected to the second shaft 5 so as to be integrally rotatable.

  The output member 39 is formed in a hollow shape, and the second shaft 5 is inserted on the inner peripheral side, and is connected to the second shaft 5 via the connecting portion 37 so as to be integrally rotatable. Further, the output member 39 is in contact with a nut 41 screwed to the end of the second shaft 5, so that the axial position with respect to the second shaft 5 is fixed. The output member 39 is connected to the propeller shaft 417 (see FIG. 1) side and outputs the driving force transmitted from the first shaft 3 to the propeller shaft 417 side.

  Such transmission of the driving force from the first shaft 3 side to the second shaft 5 side is an umbrella composed of a first gear 7 and a second gear 9 provided on the first shaft 3 and the second shaft 5, respectively. The gear set 11 is used. The first gear 7 is a ring gear, and the second gear 9 is a pinion gear that meshes with the ring gear. These bevel gear sets 11 are called spiral bevels, helical bevels or hypoid gears.

  The first gear 7 is formed in an annular shape, and is fixedly joined to a flange portion 43 formed on the outer periphery of the first shaft 3 via a welding portion 45 so as to be integrally rotatable. Further, on the outer peripheral surface of the first shaft 3, the inner peripheral surface of the first gear 7 is press-fitted and supported at the positions of the base portion 8 and the concave portion 47 of the first gear 7, thereby forming a joint portion 46. . Further, between the radial wall surface on the back side of the base portion 8 and the radial wall surface of the flange portion 43, the axial position of each other is positioned, and a joint portion 48 is formed. Therefore, the joint portion 48 is set at least on the inner diameter side of the fitting portion 57 between the casing body 15 and the cover body 17. Therefore, the fitting portion 57 and the joint portion 48 have a radial overlap relationship, but the joint portion 46 is also set so as to have a radial overlap relationship with the fitting portion 57. May be.

  An annular recess 47 having an L-shaped cross section is formed on the back side of the gear portion of the first gear 7 and the base portion 8. The first gear 7 is fixed to the first shaft 3 so as to rotate together with the first shaft 3 via the flange portion 43 and the welded portion 45 on the bottom surface portion 49 side of the concave portion 47. Since the first shaft 3 and the first gear 7 are integrally fixed by the welded portion 45 in this way, the first shaft 3 and the first gear 7 can be fixed integrally by a simple fixing means. The integral structure of the shaft 3 and the first gear 7 can be simplified. In addition, a space portion can be formed in a portion facing the radially outer side from the bottom surface portion 49 of the concave portion 47, and the design of the fitting portion 57 between the casing body 15 and the cover body 17 located on the outer diameter side of the concave portion 47. The degree of freedom can be improved. The first gear 7 meshes with the second gear 9 to form a bevel gear set 11. The shape of the recess 47 may be any shape that allows the fitting portion 57 to overlap in the radial direction, even if the cross section is not L-shaped. It can be adopted.

  The second gear 9 is formed as one member continuous with the second shaft 5 at the other axial end of the second shaft 5. The second gear 9 meshes with the first gear 7, and the driving force from the first gear 7 side is input to the second shaft 5. This bevel gear set 11 changes the direction of the driving force from the first shaft 3 side and transmits it to the second shaft 5 side.

  The first shaft 3, the second shaft 5, and the bevel gear set 11 are accommodated in a casing 13, and the casing 13 includes a casing body 15, a cover body 17, and a bearing support body 19.

  The casing body 15 is formed with an accommodation space for accommodating accommodation members such as the first shaft 3, the second shaft 5, and the bevel gear set 11. One side of the casing body 15 is provided with an assembly portion 51 that is assembled to a transmission case 441 (see FIG. 1) of the transmission 405, and is fixed by fastening bolts to a plurality of bolt fastening holes 53. Note that the bolt fastening hole 53 shown in FIG. 2 is configured to be fastened by inserting a bolt from the casing 13 side to the transmission 405 side, and the bolt fastening hole 53 shown in FIG. In this configuration, the bolt is inserted and fastened. The assembly 51 is provided with an O-ring 55 serving as a sealing means that partitions the internal space and the external space of the casing 13. Further, on the other side of the casing body 15, a fitting portion 57 to which the cover body 17 is fitted is provided. A baffle plate 59 that protects a breather (not shown) that adjusts the pressure inside the casing 13 is fixed by a bolt 61 at a position facing the gear of the first gear 7 in the axial direction.

  The cover body 17 is formed in a lid shape so as to close the other side of the casing body 15, is fitted to the casing body 15 by a fitting portion 57, and is fixed by a plurality of bolts 63. Further, the fitting portion 57 is positioned on the outer diameter side of the concave portion 47 and the joint portion 48 of the first gear 7, and is disposed to face the radial side surface 65 of the concave portion 47. That is, the axial positions of the fitting portion 57 and the first gear 7 are arranged so as to exceed the flange portion 43 in the axial direction and overlap in the radial direction, and the shaft between the fitting portion 57 and the joint portion 48 is arranged. The direction position is also arranged to overlap in the radial direction. Further, the fitting portion 57 is provided with an O-ring 67 as sealing means for partitioning the internal space and the external space of the casing 13, and the axial direction of the O-ring 67 as the sealing means and the first gear 7. The positions also overlap in the radial direction. For this reason, the axial direction size of the casing 13 can be reduced while maintaining the radial size of the casing 13.

  In addition, inclined ribs are provided on the side wall 69 of the cover body 17 from the outer peripheral portion side of the bearing support portion 71 that supports the bearing 31 to the fitting portion 57 side. For this reason, the rigidity of the cover body 17 is maintained, and the outer diameter side of the bearing support portion 71 of the cover body 17 can be reduced in size. A plurality of bolts 63 for fixing the cover body 17 are inserted into a plurality of bolt fastening holes 73 and 75 provided in the casing body 15 and the cover body 17, respectively. Between the adjacent bolt fastening holes 74 among the plurality of bolt fastening holes 73, the outer shape 77 of the fitting portion 79 of the bearing support 19 is located. Therefore, the outer shape 77 of the bearing support 19 and the bolt fastening holes 73 and 75 do not interfere with each other, and the axial size of the casing 13 can be changed without changing the settings of the bearing support 19 and the bolt fastening holes 73 and 75. Can be miniaturized. Here, the outer peripheral side of the casing body 15 is indicated as the outer shape 77 of the bearing support body 19. However, since the outer shape 77 of the bearing support body 19 is located on the inner peripheral side of the casing main body 15, The outer peripheral side shall be indicated.

  Further, in each of the embodiments, the outer shape 77 of the bearing support 19 shows the outer shape of the outer race of the bearing. As another possible configuration, a cylindrical bearing support that supports the outer race of the bearing is provided as a separate member. The outer shape of the fitting portion for fitting and fixing the separate bearing support to the casing body 15 may be the outer shape of the bearing support.

  The bearing support 19 is fixed by fitting the outer shape 77 described above with the fitting portion 79 on the casing body 15 on the side where the second shaft 5 of the casing body 15 is disposed. Is functioning. The bearing 35 is a double angular type bearing including an outer race as the bearing support 19, an inner race, and a pair of balls. A shim 81 for adjusting the meshing of the bevel gear set 11 is provided between the inner race of the bearing 35 and the second gear 9 in the axial direction. In addition, a seal 83 is disposed at the axial end of the bearing 35, and a dust cover 85 that abuts the lip of the seal 83 on the outer periphery of the output member 39 to prevent intrusion of dust or muddy water into the casing 13. Is arranged. Further, a flange portion 87 is provided at an end portion of the bearing support body 19, and the bearing support body 19 is fixed to the bolt fastening hole 90 of the casing body 15 through a plurality of bolts 89 at the fitting portion 79. Yes.

  A plurality of sealing means for partitioning the inside and the outside of the casing 13 are disposed in the casing 13 that accommodates such members. Specifically, in addition to the O-rings 55 and 67, the seal 83, and the dust cover 85, seals 91 and 93 are disposed between the casing body 15 and both axial ends of the first shaft 3. Further, a seal 95 is disposed between the first shaft 3 and the axle.

  Here, the seal 91 is composed of two seal members arranged back to back, and each separates the lubricating oil on the transmission 405 side and the lubricating oil enclosed in the casing 13. The seal 91 is located on the inner side of the casing 13 with respect to the assembly portion 51 of the casing body 15 with the transmission case 441. For this reason, the radial size of the seal 91 does not affect the assembled portion 51, and the degree of freedom in design, such as the radial and axial dimensions of the assembled portion 51, can be improved. The seal 91 is inserted and assembled from the opening on the fitting portion 57 side before the cover body 17 is assembled to the casing body 15. Further, the seal 91 has two members arranged adjacent to each other, but only the member that partitions the lubricating oil sealed in the casing 13 can be disposed between the casing body 15 and the first shaft 3. In this case, a member that partitions the lubricating oil on the transmission 405 side may be disposed on the transmission 405 side.

  Further, on the outer peripheral side between the two seal members of the seal 91, air vent holes 92 are provided from the casing main body 15 toward the outside atmosphere side, and in the space on both sides in the axial direction in the sliding portion of each seal member. The fluctuating pressure generated is eased and the sealing performance is improved.

  Lubricating oil that lubricates and cools the meshing portions and sliding portions of the gears is accommodated in the casing 13 in which the internal space and the external space are partitioned by each sealing means. This lubricating oil is introduced into the casing 13 from the filler hole 27.

  The filler hole 27 is provided in the vicinity of the fitting portion 79 of the casing body 15 with the bearing support 19. After the lubricating oil is introduced into the casing 13 from the filler hole 27, the filler hole 27 is closed by the filler plug 97. The oil groove 23 is provided in the fitting portion 79 of the casing body 15 in the portion where the filler hole 27 is provided.

  The oil groove 23 is located on the outer peripheral side of the fitting surface 21 that is the fitting portion 79 of the casing main body 15 with the bearing support 19 and faces the outer peripheral surface of the bearing support 19. In the meat part on the outer peripheral side from 21, it is formed by cutting with a lathe or punching along the fitting direction, and one end of the oil groove 23 communicates with the space inside the casing 13. The oil groove 23 has one end communicating with the space inside the casing 13 and the other end walled so that the lubricating oil scraped by the rotation of the first gear 7 and the second gear 9 can be easily introduced. It is closed at the part and becomes a lubricating oil reservoir. The oil groove 23 is set in a tunnel shape having a crescent cross section and a predetermined length in the axial direction. Further, the oil groove 23 is provided in communication with the filler hole 27 at an intermediate portion of a predetermined length, and the lubricating oil can be introduced from the filler hole 27 using the oil groove 23, and more lubricating oil can be introduced. It is easy to be introduced into the oil groove 23. An oil hole 25 provided in the bearing support 19 is communicated with the oil groove 23.

  A plurality of oil holes 25 are provided in the bearing support 19 so as to communicate with the oil grooves 23. The oil hole 25 communicates the oil groove 23 on the outer peripheral side of the bearing support 19 with the inner peripheral side of the bearing support 19. Therefore, the lubricating oil can be reliably supplied from the oil groove 23 to the inner peripheral side of the bearing support body 19, and the bearing 35 for supporting the second shaft 5 and the sliding portion on the second shaft 5 side can be reliably lubricated. can do. By providing the oil groove 23 and the oil hole 25 in this manner, the lubricating oil can be reliably supplied to the sliding portion with a simple configuration.

  In such power transmission of the power transmission device 1, the driving force from the differential case 433 is transmitted to the first gear 7 via the first shaft 3, and the bevel gear set 11 including the first gear 7 and the second gear 9. The direction is changed. Then, the driving force transmitted to the second gear 9 is transmitted to the output member 39 via the second shaft 5 and output to the propeller shaft 417 side.

  In such a power transmission device 1, the casing body 15 is provided with a fitting surface 21 with the bearing support body 19, and an oil groove that communicates with the inside of the casing 13 along the fitting direction on the outer peripheral side of the fitting surface 21. Since the oil groove 23 is formed on the casing main body 15 side between the casing main body 15 and the bearing support 19, the oil groove 23 can be lubricated with as much freedom as possible in setting the shape of the oil groove 23. Oil can flow effectively. In addition, a reduction in the support area of the support surface of the bearing support 19 is suppressed, the support stability of the bearing support 19 is increased, and the meshing vibration of the bevel gear set 11 can be reduced.

  Further, since the bearing support 19 is provided with the oil hole 25 communicating with the oil groove 23, the lubricating oil flowing into the oil groove 23 can be reliably supplied to the oil hole 25, and the bearing support 19 The side support portion and the sliding portion can be reliably lubricated.

  Further, since the filler hole 27 for introducing the lubricating oil into the inside of the casing 13 is communicated with the oil groove 23, the lubricating oil is introduced into the casing 13 from the filler hole 27 using the oil groove 23. In addition to simplification, the lubricating oil is reliably supplied also into the oil groove 23, and the lubricity can be further improved.

  Therefore, the lubricity on the bearing support 19 side in the casing 13 can be improved.

(Second Embodiment)
A second embodiment will be described with reference to FIG.

  In the power transmission device 101 according to the present embodiment, the first shaft 3 and the first gear 7 are integrally fixed by a bolt 103. In addition, although the same code | symbol is described to the structure same as 1st Embodiment, description is abbreviate | omitted, but since it is the same structure as 1st Embodiment, a structure and functional description refer to 1st Embodiment. Although omitted, the obtained effects are the same.

  As shown in FIG. 6, the base portion 8 of the first gear 7 is fixed to the flange portion 105 of the first shaft 3 by a bolt 103 so as to be integrally rotatable with the first shaft 3. In addition, an axial joint portion 48 is formed by fastening with a bolt 103 between the radial wall surface on the back side of the base portion 8 and the radial wall surface of the flange portion 105. Further, a radial joint portion 46 is formed between the inner peripheral surface of the base portion 8 and the outer peripheral surface of the first shaft 3. An annular recess 107 having an L-shaped cross section is formed in the base portion 8 on the back side of the gear portion of the first gear 7. On the outer diameter side of the concave portion 107, the fitting portion 57 between the casing body 15 and the cover body 17 is positioned beyond the outer peripheral portion of the flange portion 105 in the axial direction inner side (in the axial direction of the first gear 7). The fitting portion 57 is disposed to face the radial side surface 109 of the recess 107. For this reason, the axial position of the fitting part 57 and the first gear 7 can be arranged to overlap in the radial direction, and the axial size of the casing 13 can be reduced while maintaining the radial size of the casing 13. Can be

  Further, since the axially joined portion 48 and the radially joined portion 46 are both disposed on the inner diameter side of the fitting portion 57, the fitting portion 57 and the joined portions 46, 48 are overlaid in the radial direction. The axial size can be reduced while wrapping and maintaining the radial size of the casing 13. Even when the first shaft 3 and the first gear 7 are integrally fixed by the bolt 103, the lubricity on the bearing support 19 side can be improved.

  In such a power transmission device 101, since the first shaft 3 and the first gear 7 are integrally fixed by the bolt 103, the first shaft 3 and the first gear 7 are fixed integrally by a simple fixing means. Thus, the integrated structure of the first shaft 3 and the first gear 7 can be simplified.

(Third embodiment)
A third embodiment will be described with reference to FIG.

  In the power transmission device 201 according to the present embodiment, the first shaft 3 and the first gear 7 are integrally fixed by press-fitting. In addition, although the same code | symbol is described to the structure same as 1st Embodiment, description is abbreviate | omitted, but since it is the same structure as 1st Embodiment, a structure and functional description refer to 1st Embodiment. Although omitted, the obtained effects are the same.

  As shown in FIG. 7, the first gear 7 can rotate integrally with the first shaft 3 by being press-fitted into a press-fitting portion 203 formed between the outer periphery of the first shaft 3 and the inner periphery of the first gear 7. It is fixed to. The press-fitting portion 203 forms a radial joint 46, and the radial wall surface of the flange portion 205 of the first shaft 3 and the radial wall surface on the inner diameter side of the base portion 8 of the first gear 7 are mutually connected. It is a positioning portion for positioning the axial position of the shaft, that is, an axial joint portion 48, and a fixing member 207 such as a snap ring is provided on the opposite side of the flange portion 205 across the first gear 7 in the axial direction. It is fixed to the shaft 3 and the axial position of the first gear 7 is fixed. An annular recess 209 having an L-shaped cross section is formed on the back side of the gear of the first gear 7. A fitting portion 57 between the casing main body 15 and the cover body 17 is positioned on the outer diameter side of the recess 209, and the fitting portion 57 is disposed to face the radial side surface 211 of the recess 209. For this reason, the axial position of the fitting part 57 and the first gear 7 can be arranged to overlap in the radial direction, and the axial size of the casing 13 can be reduced while maintaining the radial size of the casing 13. Can be

  Further, since the axially joined portion 48 and the radially joined portion 46 are both disposed on the inner diameter side of the fitting portion 57, the fitting portion 57 and the joined portions 46, 48 are overlaid in the radial direction. The axial size can be reduced while wrapping and maintaining the radial size of the casing 13. Even when the first shaft 3 and the first gear 7 are integrally fixed by the press-fit portion 203, the lubricity on the bearing support 19 side can be improved.

  In such a power transmission device 201, since the first shaft 3 and the first gear 7 are integrally fixed by press-fitting (press-fitting portion 203), the first shaft 3 and the first gear 7 are connected by a simple fixing means. It can be fixed integrally, and the integrated structure of the first shaft 3 and the first gear 7 can be simplified.

(Fourth embodiment)
A fourth embodiment will be described with reference to FIG.

  In the power transmission device 301 according to the present embodiment, the first shaft 3 and the first gear 7 are integrally fixed by a spline. In addition, although the same code | symbol is described to the structure same as 1st Embodiment, description is abbreviate | omitted, but since it is the same structure as 1st Embodiment, a structure and functional description refer to 1st Embodiment. Although omitted, the obtained effects are the same.

  As shown in FIG. 8, the first gear 7 is integrated with the first shaft 3 by spline connection to a spline connection portion 303 formed between the outer periphery of the first shaft 3 and the inner periphery of the first gear 7. It is fixed so that it can rotate. The spline connecting portion 303 forms a radial joint 46, and the radial wall surface of the flange portion 305 of the first shaft 3 and the radial wall surface on the inner diameter side of the base portion 8 of the first gear 7 are mutually connected. It is a positioning part for positioning the axial position of the first part 7, that is, an axial joint part 48, and a fixing member 307 such as a snap ring is first on the opposite side of the flange part 305 with the first gear 7 sandwiched in the axial direction. It is fixed to the shaft 3 and the axial position of the first gear 7 is fixed. An annular recess 309 having an L-shaped cross section is formed in the base portion 8 on the back side of the gear portion of the first gear 7. A fitting portion 57 between the casing main body 15 and the cover body 17 is positioned on the outer diameter side of the concave portion 309, and the fitting portion 57 is disposed to face the radial side surface 311 of the concave portion 309. For this reason, the axial position of the fitting part 57 and the first gear 7 can be arranged to overlap in the radial direction, and the axial size of the casing 13 can be reduced while maintaining the radial size of the casing 13. Can be

  Further, since the axially joined portion 48 and the radially joined portion 46 are both disposed on the inner diameter side of the fitting portion 57, the fitting portion 57 and the joined portions 46, 48 are overlaid in the radial direction. The axial size can be reduced while wrapping and maintaining the radial size of the casing 13. Even when the first shaft 3 and the first gear 7 are integrally fixed by the spline connecting portion 303, the lubricity on the bearing support 19 side can be improved.

  In such a power transmission device 301, the first shaft 3 and the first gear 7 are integrally fixed by a spline (spline connecting portion 303), so that the first shaft 3 and the first gear 7 can be connected by a simple fixing means. Can be integrally fixed, and the integral structure of the first shaft 3 and the first gear 7 can be simplified.

  In the power transmission device according to the embodiment of the present invention, the first gear as the input gear is provided on the first shaft to which the driving force is directly input from the differential case, and the second gear as the output gear is the first shaft. The bevel gear set is configured by the first and second gears arranged in a crossing manner with the first shaft and the second gear, but is disposed between the first shaft and the second shaft in parallel with the first shaft. An intermediate shaft is provided, a transmission force is transmitted between the first shaft and the intermediate shaft, an intermediate gear provided on the intermediate shaft so as to be integrally rotatable, and a second shaft that is arranged to intersect the intermediate shaft. A bevel gear set may be configured by the second gear disposed so as to be integrally rotatable therewith. In this case as well, the above-described lubrication configuration can be adopted, but naturally, the first shaft, the second shaft, and the intermediate shaft are accommodated in the casing and supported by the casing.

  In addition, the first axis is the input side and the second axis is the output side. However, the first axis is the output side, the second axis is the input side, and the like. The input / output relationship may be any form as long as power can be transmitted to each other.

  Furthermore, the ring gear and the first shaft are integrally fixed by providing a flange portion on the first shaft. For example, the ring gear for the first shaft is welded between the inner periphery of the ring gear and the outer periphery of the first shaft. In the case of a structure in which the axial position can be securely fixed, it is not necessary to provide a flange portion.

DESCRIPTION OF SYMBOLS 1,101,201,301 ... Power transmission device 3 ... 1st shaft 5 ... 2nd shaft 7 ... 1st gear 9 ... 2nd gear 11 ... Bevel gear set 13 ... Casing 15 ... Casing main body 17 ... Cover body 19 ... Bearing Support 21 ... Fitting surface 23 ... Oil groove 25 ... Oil hole 27 ... Filler hole

Claims (1)

A first shaft that is formed in a hollow shape so that an axle is inserted into the shaft center so as to be relatively rotatable, a second shaft that is disposed so that the shaft center intersects the shaft center of the first shaft, and the first shaft The first gear provided to be rotatable integrally with the second gear, the second gear provided to be rotatable integrally with the second shaft, and the first gear or the intermediate shaft disposed in parallel with the first shaft. A bevel gear set that includes an intermediate gear and the second gear, and is capable of transmitting a driving force transmitted between the first shaft and the second shaft by changing the direction; and the first shaft. And a casing that accommodates the second shaft and the bevel gear set, and the casing is fitted and fixed to the casing body that supports one end side of the first shaft, and the casing A cover body that supports the other end of the first shaft, and is fitted and fixed to the casing body. Serial consists of a bearing support for supporting the second shaft, a power transmission device for accommodating the lubricating oil therein,
The casing body is provided with a fitting surface with the bearing support, and the fitting surface is provided with an oil groove communicating with the inside of the casing. The bearing support is provided with an oil groove communicating with the oil groove. A power transmission device, wherein a hole is provided, and a filler hole for introducing the lubricating oil into the casing is communicated with the oil groove.

Images