JP6269632B2 - Transfer device - Google Patents

Description

  The present invention relates to a transfer device mounted on a four-wheel drive vehicle.

  As a four-wheel drive vehicle, a drive source such as an engine and a transmission are arranged at the front part of the vehicle body so that the shaft center extends in the longitudinal direction of the vehicle body, and the output torque of the drive source transmitted from the output part of the transmission is rearward of the vehicle body A transfer device is provided for outputting torque to the rear wheel as the main driving wheel and the front wheel as the auxiliary driving wheel via the rear wheel propeller shaft extending to the rear wheel and the rear wheel differential device. There is known a configuration in which an output torque of a driving source is output to a front wheel via a front wheel propeller shaft extending in front of the vehicle body and a front wheel differential, so that the front wheel can be driven in addition to the rear wheel.

  In the four-wheel drive vehicle, the transfer device is provided with a coupling for extracting the torque for the front wheels, and the output torque of the drive source is evenly transmitted to the front wheels and the rear wheels by completely fastening the coupling. It becomes a driving state, and it becomes a two-wheel driving state where the output torque of the driving source is transmitted only to the rear wheels by completely releasing the coupling, depending on the fastening state between the complete fastening and full release of the coupling The distribution of torque output to the front wheels is adjusted.

  For example, Patent Document 1 discloses a transfer device mounted on such a four-wheel drive vehicle. In Patent Document 1, a coupling for extracting torque for the front wheels is disposed on an input shaft to which output torque of the drive source is transmitted from the output portion of the transmission, and the output torque of the drive source extracted by the coupling is It is transmitted to the drive sprocket provided on the input shaft, the driven sprocket connected to the drive sprocket via a chain, and the output shaft for the front wheel provided in parallel with the input shaft and the driven sprocket is fixed to the rear wheel. In addition, a transfer device configured to be able to drive front wheels is also disclosed.

JP 2009-257432 A

  In a four-wheel drive vehicle equipped with a transfer device configured in this way, particularly when the drive source is an engine, the engine output torque fluctuates due to intermittent explosion in the engine combustion chamber. The fluctuation is transmitted to the transfer device via the transmission.

  Therefore, when the torque output to the front wheels taken out by the coupling is relatively small, depending on the frequency of engine torque fluctuations, the front wheel side drive from the coupling to the front wheels having a predetermined natural frequency against torsional vibrations As the system resonates with engine torque fluctuations, the vibration of the drive system becomes large, and due to this vibration, a rattling sound between gears provided in the drive system can be generated and cause noise.

  With respect to the vibration of the drive system, in the operation region where the drive system resonates with the torque fluctuation of the output torque of the engine, the torque distribution to the front wheels by coupling is increased and a load is applied to the drive system to increase the front wheel. By increasing the torque transmitted to the engine, it is conceivable to suppress the rattling noise caused by the resonance of the drive system, but this will increase the drive loss and worsen the fuel consumption, so torque distribution to the front wheels It is desirable to suppress the rattling noise caused by the resonance of the drive system without increasing the frequency.

  On the other hand, it is conceivable to arrange a damper device in order to suppress the rattling noise between the gears provided in the drive system. Therefore, it is desired to suppress the rattling noise while making the transfer device compact.

  Then, this invention makes it a subject to provide the transfer apparatus which can suppress a rattling noise, in the transfer apparatus mounted in a four-wheel drive vehicle, compactly.

  In order to solve the above problems, the present invention is configured as follows.

  First, the invention according to claim 1 of the present application is provided with an input shaft into which the output torque of the drive source is input from one side in the axial direction, and the output torque of the drive source provided on the other side in the axial direction of the input shaft. An output unit for main drive wheels that outputs to the drive wheels; an output shaft for auxiliary drive wheels that is provided in parallel with the input shaft and outputs the output torque of the drive source to the auxiliary drive wheels; and is provided on the input shaft. A coupling for extracting torque output to the auxiliary drive wheel, a drive gear provided on the input shaft in a hollow shaft shape, and a driven gear provided on the output shaft for the auxiliary drive wheel and meshing with the drive gear. The drive gear includes a first-side extension part and a second-side extension part that extend in the axial direction on one side and the second side, respectively, and the first-side extension part and the second-side extension part. And transformer The drive gear is supported by the transfer case via drive gear bearings respectively provided between the drive case, and is fitted to the inner peripheral side of the other extension portion of the drive gear to the coupling. And a damper device is provided between the coupling and the drive gear on the input shaft, and the damper device has an inner peripheral portion of the damper device connected to the connector. In addition, the outer peripheral portion of the damper device is connected to the outer peripheral side of the other extension portion of the drive gear.

  According to a second aspect of the present invention, in the transfer device according to the first aspect, the coupling includes an inner rotating member coupled to the input shaft, and an outer rotating member coupled to the damper device. A friction plate disposed between the inner rotating member and the outer rotating member, and a coupling bearing provided on one axial side of the friction plate between the inner rotating member and the outer rotating member. The damper device and the coupling bearing are arranged to overlap in the axial direction.

  According to a third aspect of the present invention, in the transfer device according to the second aspect, the main drive wheel output portion is provided on the same axis as the input shaft and is connected to the input shaft for driving. An output shaft for a main drive wheel that outputs the output torque of the power source to the main drive wheel, and an axial end on the other side in the axial direction of the input shaft in a recess formed in an end on the one side in the axial direction of the output shaft for the main drive wheel Is inserted and fitted, and the fitting portion between the input shaft and the main drive wheel output shaft is provided so as to overlap the coupling bearing in the axial direction.

  According to the invention described in claim 1 of the present application, the drive gear is supported by the transfer case via the drive gear bearings provided between the one side extending portion and the other side extending portion and the transfer case. The coupling is provided with a coupling portion that is fitted to the inner peripheral side of the other extension portion of the drive gear and coupled to the drive gear.

  As a result, the coupling is supported on the transfer case via the drive gear bearing provided between the extension portion on the other side of the drive gear to which the coupling portion provided on the coupling is fitted and the transfer case. Therefore, the axial dimension can be shortened compared to the case where the bearing for supporting the coupling in the transfer case is provided on the other side in the axial direction of the drive gear bearing, and the transfer device is configured compactly. be able to.

  A damper device is provided between the coupling and the drive gear. The damper device has an inner peripheral portion connected to the connecting portion and an outer peripheral portion connected to the outer peripheral side of the other extension portion of the drive gear. Thus, the damper device can be disposed so as to be sandwiched between the inner peripheral side and the outer peripheral side of the extending portion on the other side of the drive gear, and the transfer device can be configured compactly.

  The coupling and the drive gear are also coupled via a damper device, so that the drive system from the coupling to the auxiliary drive wheel via the drive gear and the driven gear resonates with the torque fluctuation of the output torque of the drive source. The rattling noise between gears, such as between the drive gear and the driven gear, can be suppressed.

  Therefore, in the transfer device mounted on the four-wheel drive vehicle, the rattling noise can be suppressed while being compactly configured.

  According to the invention described in claim 2, the coupling is provided between the inner rotating member connected to the input shaft, the outer rotating member connected to the damper device, and the inner rotating member and the outer rotating member. A coupling bearing provided on one side of the friction plate in the axial direction, and the damper device and the coupling bearing are disposed so as to overlap in the axial direction. The axial dimension can be shortened as compared with the case where they are arranged side by side in the axial direction, and a compact configuration can be achieved.

  According to the third aspect of the present invention, the other end of the input shaft in the axial direction is inserted into the recess formed in the one end of the main drive wheel output shaft in the axial direction. The fitting portion between the shaft and the main drive wheel output shaft is provided so as to overlap the coupling bearing in the axial direction, so that the input shaft and the main drive wheel output shaft are connected via the coupling bearing. By supporting the fitting portion on the outer rotating member side of the coupling, the fitting portion between the input shaft and the main drive wheel output shaft can be stably attached to the transfer case via the coupling bearing and the drive gear bearing. Can be supported.

It is the schematic which shows the power transmission mechanism of the four-wheel drive vehicle by which the transfer apparatus which concerns on embodiment of this invention is mounted. It is sectional drawing which shows the said transfer apparatus. It is a principal part enlarged view of the said transfer apparatus.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

  FIG. 1 is a schematic diagram showing a power transmission mechanism of a four-wheel drive vehicle equipped with a transfer device according to an embodiment of the present invention. As shown in FIG. 1, a four-wheel drive vehicle 1 equipped with a transfer device according to an embodiment of the present invention is a four-wheel drive vehicle based on a front engine and a rear drive vehicle, and is used as a drive source at the front of the vehicle body. The engine 2 and the transmission 3 are arranged so that the shaft centers extend in the longitudinal direction of the vehicle body.

  On the rear side of the transmission 3, the output torque of the engine 2 transmitted from the output portion of the transmission 3 is rear as a main drive wheel via a rear wheel propeller shaft and a rear wheel differential device extending rearward of the vehicle body. A transfer device 10 is provided that outputs torque to the wheels and outputs torque to the front wheels as auxiliary drive wheels.

  The transfer device 10 is provided on the input shaft 11 where the output torque of the engine 2 is input from the front side of the vehicle body which is one side in the axial direction, and on the rear side of the vehicle body which is the other side of the input shaft 11 in the axial direction. A rear wheel output unit 12 that outputs torque to the rear wheels, and a front wheel output shaft 13 that is provided in parallel with the input shaft 11 and outputs the output torque of the engine 2 to the front wheels are provided. In the present embodiment, the rear-wheel output unit 12 is formed by the rear-wheel output shaft 12 that is provided on the same axis as the input shaft 11 and is connected to the input shaft 11 and outputs the output torque of the engine 2 to the rear wheels. Has been.

  The transfer device 10 is also provided with a coupling 20 provided on the input shaft 11 and connected to the input shaft 11, and a drive provided on the front side of the coupling 20 on the input shaft 11 and connected to the coupling 20. A gear 14 and a driven gear 15 which is provided on the front wheel output shaft 13 and is connected to the front wheel output shaft 13 and meshes with the drive gear 14 are provided.

  As the coupling 20, an electromagnetic coupling or the like is used, and the torque output to the front wheels is extracted from the output torque of the engine 2. The output torque of the engine 2 taken out by the coupling 20 is transmitted to the front wheel output shaft 13 via the drive gear 14 and the driven gear 15.

  The front wheel output shaft 13 is connected via a universal joint 30 to a front wheel propeller shaft 40 extending forward of the vehicle body. The front wheel propeller shaft 40 is connected to an input shaft 61 of a front wheel differential 60 through a universal joint 50, and the input shaft 61 of the front wheel differential 60 is connected to an axle 62 connected to the left and right front wheels, respectively. It is connected.

  Thus, the output torque of the engine 2 taken out by the coupling 20 is transmitted to the front wheel output shaft 13 via the drive gear 14 and the driven gear 15, and the front wheel propeller shaft 40 and the front wheel difference are transmitted from the front wheel output shaft 13. It is transmitted to the front wheels via the moving device 60. In the four-wheel drive vehicle 1, the coupling 20 can change the torque distribution between the front wheels and the rear wheels in the range of front wheels: rear wheels = 0: 100 to 50:50. The operation of the coupling 20 is controlled by a control unit (not shown).

  The transfer device 10 is also provided with a damper device 40 on the input shaft 11 between the coupling 20 and the drive gear 14, and the damper device 40 extends from the coupling 20 to the drive gear 14, the driven gear 15, and the front wheel output shaft. 13. The front-wheel drive system that reaches the front wheels via the front-wheel propeller shaft 40 and the front-wheel differential device 60 is configured to reduce the resonance frequency at which the front-wheel drive system resonates with the torque fluctuations of the engine 2 within the practical range of the engine 2. ing.

  Next, the transfer device 10 according to the embodiment of the present invention will be described in more detail with reference to FIGS.

  FIG. 2 is a sectional view showing the transfer device, and FIG. 3 is an enlarged view of a main part of the transfer device. As shown in FIG. 2, the transfer device 10 includes a transfer case 51 that is fastened and fixed to the transmission 3 using fastening bolts 4. The transfer case 51 is configured by being divided by a first case member 52, a second case member 53, and a third case member 54 that are arranged in order from the front side of the vehicle body, and the first case member 52 and the second case member 53 are divided. The second case member 53 and the third case member 54 are fastened and fixed using the fastening bolt 6 while being fastened and fixed using the fastening bolt 5.

  In the transfer case 51, an input shaft 11 connected to the output portion 3a of the transmission 3, a rear wheel output shaft 12 provided on the same axis line as the input shaft 11 on the vehicle body rear side of the input shaft 11, A front wheel output shaft 13 provided in parallel with the input shaft 11 is rotatably supported.

  The input shaft 11 has a recess 11b formed in a front end portion 11a, which is an end portion on the front side of the vehicle body, and is spline-fitted with the output portion 3a of the transmission 3 inserted into the recess 11b. It is designed to rotate with. The input shaft 11 is also inserted into a recess 12b formed in a front end portion 12a, which is an end portion of the rear wheel output shaft 12 on the front side of the vehicle body. The rear output shaft 12 is rotated together with the input shaft 11 by spline fitting with the output shaft 12 for use. The rear-wheel output shaft 12 is spline-fitted and connected to a connecting member 7 whose rear end portion 12c is connected to the rear-wheel propeller shaft.

  In the transfer case 51, a hollow shaft-like drive gear 14 is provided on the input shaft 11 between the vertical wall portion 52a of the first case member 52 and the vertical wall portion 53a of the second case member 53, and for the front wheel. A driven gear 15 is provided on the output shaft 13, and a coupling 20 is provided on the front wheel output shaft 12 between the vertical wall portion 53 a of the second case member 53 and the vertical wall portion 54 a of the third case member 54. Yes.

  The coupling 20 is disposed between the inner rotating member 21 connected to the input shaft 11, the outer rotating member 22 connected to the drive gear 14, and the inner rotating member 21 and the outer rotating member 22. 21 and the outer rotary member 22 are provided with a plurality of friction plates 23 alternately splined. In the present embodiment, the inner rotation member 21 is formed by the front wheel output shaft 12.

  The coupling 20 also includes a cover member 24 coupled to the outer rotating member 22 on the vehicle body rear side of the plurality of friction plates 23 spline-engaged with the inner rotating member 21 and the outer rotating member 22, and a plurality of friction plates 23. Cam mechanism 25 disposed between the plurality of friction plates 23 and the cover member 24, and a cam mechanism disposed between the plurality of friction plates 23 and the cover member 24 and receiving a magnetic force from the outside. And a clutch mechanism 26 for actuating 25.

  The coupling 20 also includes a solenoid 27 on the vehicle body rear side of the cover member 24, and controls the engagement state of the plurality of friction plates 23 via the clutch mechanism 26 and the cam mechanism 25 by energization control of the solenoid 27 by the control unit. Thus, the torque output to the front wheels out of the output torque of the engine 2 is variably controlled and extracted.

  The solenoid 27 is fixed to the third case member 54 of the transfer case 51 via a cylindrical support member 28 that supports the solenoid 27. A coupling bearing 29 is provided between the inner peripheral surface of the support member 28 and the outer peripheral surface of the boss portion 24a provided on the inner peripheral side of the cover member 24 and extending toward the rear of the vehicle body. Thus, the vehicle body rear side of the coupling 20 is rotatably supported by the transfer case 51.

  The outer rotating member 22 of the coupling 20 includes a substantially cylindrical main body portion 22a in which a plurality of friction plates 23 are spline engaged. The outer rotating member 22 of the coupling 20 is provided with a connecting portion 22b that is connected to the drive gear 14, and the connecting portion 22b extends from the end of the main body 22a on the front side of the vehicle body to the front side of the plurality of friction plates 23. A cylindrical first boss portion 22c extending from the main body portion 22 to the front side of the vehicle body and having a smaller outer diameter than the main body portion 22, and extending from the first boss portion 22c to the front side of the vehicle body and outside the first boss portion 22c. And a cylindrical second boss portion 22d having a small diameter.

  The rear wheel output shaft 12 constituting the inner rotation member 21 is fitted to the inner peripheral surface of the first boss portion 22c, and the vehicle body front side of the rear wheel output shaft 12 is connected to the outer rotation member 22 of the coupling 20 and the inner side. Between the rotating member 21 and the outer peripheral member 21 via a coupling bearing 61 provided between the inner peripheral surface of the first boss portion 22 c and the outer peripheral surface of the rear wheel output shaft 12. It is supported by.

  In the present embodiment, as shown in FIG. 3, the rear end portion 11c of the input shaft 11 is inserted into the recess 12b formed in the front end portion 12a of the rear wheel output shaft 12 and is spline-fitted. 11 and the rear wheel output shaft 12 are provided so as to overlap the coupling bearing 61 in the axial direction.

  As shown in FIG. 2, the vehicle rear side of the rear wheel output shaft 12 is spline-fitted to the connecting member 7 connected to the rear wheel propeller shaft, and the inner peripheral surface of the transfer case 51 and the outer periphery of the connecting member 7. It is rotatably supported by the transfer case 51 via a bearing 62 and a connecting member 7 provided between the two surfaces.

  The connecting portion 22b provided on the outer rotating member 22 of the coupling 20 has a second boss portion 22d fitted on the outer peripheral side of the input shaft 11 and on the inner peripheral side of the drive gear 14, specifically described later. It is fitted to the inner peripheral side of the rear extension 14b. The vehicle body front side of the second boss portion 22d of the connecting portion 22b is spline-fitted to the inner peripheral surface of the drive gear 14 and connected to the drive gear 14.

  The drive gear 14 includes a front-side extending portion 14a and a rear-side extending portion 14b extending to the vehicle body front side and the vehicle body rear side, respectively. A drive gear bearing 63 is provided between the front extension 14a and the transfer case 51, and a drive gear bearing 64 is provided between the rear extension 14b and the transfer case 51. The transfer case 51 is rotatably supported via drive gear bearings 63 and 64.

  A torsional damper is used as the damper device 40 provided between the coupling 20 and the drive gear 14, and the damper device 40 is a cylindrical outer tube member that forms the outer periphery of the damper device 40 as shown in FIG. 41, a cylindrical inner cylinder member 42 that forms the inner periphery of the damper device 40, and an outer cylinder member 41 and an inner cylinder member 42 that are provided between the outer cylinder member 41 and the inner cylinder member 42. The cylindrical elastic member 43 is provided.

  The inner cylinder member 42 of the damper device 40 is formed using a metal material, and is disposed on the outer peripheral side of the first boss portion 22c of the connecting portion 22b provided on the outer rotating member 22 of the coupling 20, so that the first boss The outer peripheral side of the portion 22c is spline-fitted and connected to the connecting portion 22b.

  The outer cylinder member 41 of the damper device 40 is formed using a metal material and is coupled to a cylindrical power transmission member 44 disposed on the outer peripheral side of the outer cylinder member 42, and the vehicle body front side of the power transmission member 44 is in the radial direction. It extends inward, and its inner end extends to the front side of the vehicle body and is coupled and connected to the outer peripheral side of the rear side extending portion 14b of the drive gear 14.

  The elastic member 43 is formed using an elastic material such as rubber, and is connected to the front wheel through the drive gear 14, the driven gear 15, the front wheel output shaft 13, the front wheel propeller shaft 40, and the front wheel differential device 60 from the coupling 20. The driving system on the front wheel side that is reached is formed so as to lower the resonance frequency at which the torque fluctuation of the engine 2 resonates under the practical range of the engine 2.

  In the present embodiment, in the damper device 40, the inner cylinder member 42 of the damper device 40 is connected to the connecting portion 22 b provided in the coupling 20, and the outer cylinder member 41 of the damper device 40 extends to the rear side of the drive gear 14. The damper device 40 and the coupling bearing 61 are connected to the outer peripheral side of the installation portion 14b, and are disposed so as to overlap in the axial direction.

  The spline fitting portion in which the connecting portion 22b provided in the coupling 20 and the inner cylinder member 42 of the damper device 40 are spline-fitted includes the connecting portion 22b provided in the coupling 20 and the drive gear 14. The backlash between the gears in the spline fitting portion is formed smaller than the spline fitting portion to be spline fitted.

  Thus, when the front wheel torque extracted by the coupling 20 is equal to or less than a predetermined value, the front wheel torque extracted by the coupling 20 is transmitted from the coupling 20 to the drive gear 14 via the damper device 40. The At this time, due to the twist of the elastic member 43 of the damper device 40, the front wheel that reaches the front wheel from the coupling 20 through the drive gear 14, the driven gear 15, the front wheel output shaft 13, the front wheel propeller shaft 40, and the front wheel differential device 60. The resonance frequency at which the drive system on the side resonates with the torque fluctuations of the engine 2 is reduced below the practical range of the engine 2.

  On the other hand, when the torque for the front wheels taken out by the coupling 20 exceeds a predetermined value, the torque for the front wheels taken out by the coupling 20 is transmitted from the coupling 20 to the drive gear 14 via the damper device 40. At the same time, it is transmitted from the coupling 20 to the drive gear 14 via a spline fitting portion between the coupling portion 22 b provided on the coupling 20 and the drive gear 14.

  As described above, the spline fitting portion between the coupling portion 22 b provided on the coupling 20 and the drive gear 14 functions as a stopper mechanism that regulates the relative rotation amount of the damper device 40, and excessive torque is applied to the damper device 40. This is avoided.

  The driven gear 15 that meshes with the drive gear 14 is provided on the front wheel output shaft 13 and includes a front extension 15a and a rear extension 15b that extend to the front side and the rear side of the vehicle, respectively. A driven gear bearing 65 is provided between the front extending portion 15a and the transfer case 51, and a driven gear bearing 66 is provided between the rear extending portion 15b and the transfer case 51. The driven gear 15 is used for the driven gear. It is rotatably supported by the transfer case 51 via bearings 65 and 66.

  The driven gear 15 is connected to the front wheel output shaft 13 by spline-fitting the inner peripheral surface of the rear-side extending portion 15 b and the front wheel output shaft 13. The front wheel output shaft 13 is connected to a front wheel propeller shaft 40 via a universal joint 30, and an outer joint member 31 of the universal joint 30 is formed integrally with the front wheel output shaft 13 on the vehicle body front side.

  The universal joint 30 includes an outer joint member 31 formed integrally with the front wheel output shaft 13, an inner joint member 32 coupled to the front wheel propeller shaft 40, and the outer joint member 31 and the inner joint member 32. A ball 33 that is interposed between the outer joint member 31 and the inner joint member 32 and transmits the power between the inner joint member 32 and the inner peripheral surface of the outer joint member 31 and the outer peripheral surface of the inner joint member 32. And a cage 34 that holds the motor 33 so that power can be transmitted between the front wheel output shaft 13 and the front wheel propeller shaft 40.

  In the transfer device 10, a plurality of seal members 71, 72, 73 are also provided in the transfer case 51, and oil in the transfer case 51 is prevented from leaking to the outside. A seal member 71 is disposed between the first case member 52 and the input shaft 11, and between the first case member 52 and the front extension portion 15 a of the driven gear 15 provided on the front wheel output shaft 31. A seal member 72 is disposed, and a seal member 73 is disposed between the third case member 54 and the connecting member 7 provided on the rear wheel output shaft 12.

  Further, a seal member 74 is also disposed between the vertical wall portion 53 a of the second case member 53 and the power transmission member 44 coupled to the rearward extending portion 14 b of the drive gear 14. The seal member 74 is provided so as to overlap in the axial direction at a coupling portion between the power transmission member 44 and the rear side extending portion 14 b of the drive gear 14, thereby extending the rear side of the power transmission member 44 and the drive gear 14. The axial dimension can be shortened as compared with the case where a seal member is provided between the second case member 53 and the rear extension 14b of the drive gear 14 on the vehicle body front side of the coupling portion with the portion 14b. It can be configured compactly.

  In the transfer device 10 configured as described above, the output torque of the engine 2 input to the input shaft 11 is transmitted to the rear wheel output shaft 12, and from the rear wheel output shaft 12 to the rear wheel in the two-wheel drive state. In the four-wheel drive state, torque is output from the rear wheel output shaft 12 to the rear wheels and output to the front wheels by the coupling 20 and is also output to the front wheels.

  At this time, if the torque for the front wheels taken out by the coupling 20 is equal to or less than a predetermined value, the torque is transmitted from the coupling 20 to the drive gear 14 via the damper device 40, and the drive gear 14 drives the driven gear 15 and the front wheel output shaft. 13. Output to front wheels via front wheel propeller shaft 40 and front wheel differential 60.

  At this time, the damper device 40 causes the drive system on the front wheel side from the coupling 20 to the front wheels via the drive gear 14, the driven gear 15, the front wheel output shaft 13, the front wheel propeller shaft 40, and the front wheel differential device 60. Between the drive gear 14 and the driven gear 15 that may occur when the resonance frequency that resonates with the torque fluctuation of 2 is lowered under the practical range of the engine 2 and the torque output to the front wheels taken out by the coupling 20 is relatively small, etc. The rattling noise between the gears can be suppressed.

  As described above, in the transfer device 10 according to the present embodiment, the drive gear 14 includes the drive gear bearings 63 provided between the one-side extending portion 14a and the other-side extending portion 14b and the transfer case 51, respectively. A coupling portion 22 b that is supported by the transfer case 51 via 64 and is fitted to the inner peripheral side of the other extension portion 14 b of the drive gear 14 and coupled to the drive gear 14 is provided in the coupling 20.

  As a result, the coupling 20 is connected to the drive gear bearing 64 provided between the transfer case 51 and the other extension portion 14b of the drive gear 14 into which the coupling portion 22b provided in the coupling 20 is fitted. Therefore, the axial dimension can be shortened as compared with the case where the bearing for supporting the coupling 20 on the transfer case 51 is provided on the other side in the axial direction of the drive gear bearing 64. Therefore, the transfer device 10 can be configured compactly.

  A damper device 40 is provided between the coupling 20 and the drive gear 14. The damper device 40 has an inner peripheral portion 41 connected to the connecting portion 22 b and an outer peripheral portion 42 extending on the other side of the drive gear 14. The damper device 40 is disposed so as to be sandwiched by the portions 22b and 44 connected to the inner peripheral side and the outer peripheral side of the other extended portion 14b of the drive gear 14 by being connected to the outer peripheral side of the installation portion 14b. Thus, the transfer device 10 can be configured compactly.

  The coupling 20 and the drive gear 14 are also coupled via the damper device 40, so that the drive system from the coupling 20 to the auxiliary drive wheel via the drive gear 14 and the driven gear 15 has a torque output from the drive source. The rattling noise between gears such as between the drive gear 14 and the driven gear 15 generated by resonating with torque fluctuation can be suppressed.

  Therefore, in the transfer device 10 mounted on the four-wheel drive vehicle 1, it is possible to suppress the rattling noise while configuring the transfer device 10 to be compact.

  The coupling 20 includes an inner rotating member 21 connected to the input shaft 11, an outer rotating member 22 connected to the damper device 40, and a friction plate 23 between the inner rotating member 21 and the outer rotating member 22. A coupling bearing 61 provided on one side in the axial direction is provided, and the damper device 40 and the coupling bearing 61 are disposed so as to overlap in the axial direction. Thereby, compared with the case where the damper apparatus 40 and the bearing 61 for coupling are arrange | positioned along with an axial direction, shortening of an axial direction dimension can be aimed at and it can comprise compactly.

  In addition, the input shaft 11 and the main drive wheel are inserted into and fitted into a recess 12b formed in the one end portion 12a in the axial direction of the output shaft 12 for the main drive wheel. The fitting portion with the output shaft 12 is provided so as to overlap the coupling bearing 61 in the axial direction. Thus, the input shaft 11 and the main drive wheel are supported by supporting the fitting portion between the input shaft 11 and the main drive wheel output shaft 12 on the outer rotating member 22 side of the coupling 20 via the coupling bearing 61. The fitting portion with the output shaft 12 can be stably supported on the transfer case 51 via the coupling bearing 61 and the drive gear bearing 64.

  The present invention is not limited to the illustrated embodiments, and various improvements and design changes can be made without departing from the scope of the present invention.

  As described above, according to the present invention, in a transfer device mounted on a four-wheel drive vehicle, it is possible to suppress rattling noise while being compactly configured. It may be suitably used.

DESCRIPTION OF SYMBOLS 1 Four-wheel drive vehicle 2 Engine 3 Transmission 10 Transfer apparatus 11 Input shaft 12 Rear wheel output shaft 13 Front wheel output shaft 14 Drive gear 14a Drive gear front side extension part 14b Drive gear rear side extension part 15 Driven gear 15a Driven gear front extension 15b Driven gear rear extension 20 Coupling 21 Inner rotary member 22 Outer rotary member 22b Connecting part 23 Friction plates 29, 61 Coupling bearing 40 Damper device 41 Outer cylinder member 42 Inner cylinder Member 43 Elastic member 51 Transfer case 63, 64 Drive gear bearing 65, 66 Driven gear bearing

Claims (3)

An input shaft to which the output torque of the drive source is input from one side in the axial direction; an output unit for main drive wheels that is provided on the other side in the axial direction of the input shaft and outputs the output torque of the drive source to the main drive wheels; An output shaft for auxiliary drive wheels that is provided in parallel with the input shaft and outputs the output torque of the drive source to the auxiliary drive wheels, and a coupling that is provided on the input shaft and outputs torque output to the auxiliary drive wheels A drive gear provided in a hollow shaft shape on the input shaft, and a driven gear that is provided on the output shaft for the auxiliary drive wheel and meshes with the drive gear,
The drive gear includes an extension portion on one side and an extension portion on the other side extending in the axial direction on one side and the other side, respectively, between the one side extension portion and the other side extension portion and the transfer case, respectively. Supported by the transfer case via a drive gear bearing provided,
The coupling is provided with a connecting portion that is fitted to the inner peripheral side of the other extension portion of the drive gear and connected to the drive gear,
A damper device is provided between the coupling and the drive gear on the input shaft;
In the damper device, an inner peripheral portion of the damper device is connected to the connecting portion, and an outer peripheral portion of the damper device is connected to an outer peripheral side of the other extending portion of the drive gear.
A transfer device characterized by that. The coupling includes an inner rotating member coupled to the input shaft, an outer rotating member coupled to the damper device, a friction plate disposed between the inner rotating member and the outer rotating member, A coupling bearing provided on one side in the axial direction of the friction plate between the inner rotating member and the outer rotating member;
The damper device and the coupling bearing are arranged to overlap in the axial direction.
The transfer device according to claim 1. The main drive wheel output unit is provided on the same axis as the input shaft and is connected to the input shaft and outputs an output torque of a drive source to the main drive wheel,
The other end portion in the axial direction of the input shaft is inserted into and fitted into a recess formed in one end portion in the axial direction of the output shaft for the main drive wheel,
The fitting portion between the input shaft and the output shaft for the main drive wheel is provided so as to overlap the coupling bearing in the axial direction.
The transfer device according to claim 2.

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