JP2009275817A - Power transmitting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To carry out unforced compactification while providing a torque transmitting coupling, and to facilitate even arrangement design of a propeller shaft. <P>SOLUTION: The power transmitting device is characterized by that it is equipped with a connection hollow shaft 7 and a transmission intermediate shaft 9 rotatably supported in a distribution case 5, arranged in parallel with each other, and capable of interlocking by helical spur gears 25, 26, and a rear wheel side output shaft 11 rotatably supported in the distribution case 5, arranged crossing the transmission intermediate shaft 9, interlocking with respect to the transmission intermediate shaft 9 by a ring gear 27 and a pinion gear 32, and capable of outputting to the propeller shaft. A diameter of the helical spur gear 26 of the transmission intermediate shaft 9 is provided larger than a diameter of the helical spur gear 25 of the connection hollow shaft 7, and the torque transmitting coupling 93 controlling power transmission to the transmission intermediate shaft 9 from the helical spur gear 26 is provided between an inner diameter side of the helical spur gear 26 and the transmission intermediate shaft 9. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a power transmission device used for a transfer device such as an automobile.

  Conventionally, as a structure of a power transmission device, there is a power distribution device for a four-wheel drive vehicle as described in Patent Document 1.

  This power distribution device is a transfer device that distributes and outputs the input to the front differential device to the rear wheel side, and a transfer shaft, a pinion shaft, and an output shaft are rotatably supported by the transfer case. The pinion shaft is arranged orthogonal to the transfer axis, and the output axis is arranged parallel to the pinion shaft.

  Driving force is transmitted between the transfer shaft and the pinion shaft by the meshing of the first turning gear and the second turning gear which are orthogonal meshing gears. Driving force is transmitted between the pinion shaft and the output shaft by meshing of the first and second gears which are parallel meshing gears. The driving force transmitted to the second gear is transmitted to the output shaft via a transfer clutch that is a torque transmission coupling, and is transmitted from the output shaft to the rear differential device via the propeller shaft.

  Therefore, the drive force distribution to the rear wheel side can be variably controlled by the transfer clutch according to the running condition, driving condition, etc., and the transfer clutch is arranged on the output shaft, so it has a compact structure. It becomes possible to.

  However, in such a transfer device, since the output shaft coupled to the propeller shaft is arranged parallel to the pinion shaft in the vehicle width direction, the design is such that the propeller shaft is arranged at the center in the vehicle width direction. There is a problem that it involves difficulties.

  If the output shaft is placed under the pinion shaft, it is possible to facilitate the design of placing the propeller shaft in the center in the vehicle width direction. However, the ground clearance of the propeller shaft is reduced and the minimum ground clearance is reduced. Incurs a problem that it is difficult to secure.

In addition, since the transfer clutch is attached to the second gear, it is difficult to make the device compact.
JP 2002-187446 A

  The problem to be solved is that the power transmission device is provided with a torque transmission coupling and is compact, but the arrangement design of the propeller shaft is difficult, and the device cannot be made compact.

  In the present invention, the torque transmission coupling is provided, and the compactness can be made without difficulty. In addition, in order to facilitate the layout design of the propeller shaft, the first and first shafts are rotatably supported by the case and arranged in parallel to each other. First and second shafts that can be interlocked by a second parallel meshing gear, and secondly supported by first and second orthogonal meshing gears that are rotatably supported by the case and arranged to intersect the second shaft. And a third shaft that can output to the propeller shaft in conjunction with the second shaft, and the second parallel meshing gear of the second shaft is changed to the first parallel meshing gear of the first shaft. On the other hand, a torque transmission coupling for controlling transmission of driving force from the second parallel meshing gear to the second shaft is formed between the second shaft and the inner diameter side of the second parallel meshing gear and the second shaft. The most important feature is the provision.

  In the power transmission device of the present invention, the first and second shafts rotatably supported by the case and arranged in parallel with each other and interlocked by the first and second parallel meshing gears, and the case are rotatable. A third shaft that is supported and arranged to intersect the second shaft, and that is linked to the second shaft by the first and second orthogonal meshing gears and that can output to the propeller shaft. The second parallel meshing gear of the second shaft has a larger diameter than the first parallel meshing gear of the first shaft, and is between the inner diameter side of the second parallel meshing gear and the second shaft. A torque transmission coupling is provided for controlling the driving force transmission from the second parallel meshing gear to the second shaft.

  For this reason, there is no parallel arrangement of the shaft in the vehicle width direction other than the third shaft, and the design in which the propeller shaft is arranged at the center in the vehicle width direction is facilitated.

  Moreover, since the torque transmission coupling is provided between the inner diameter side of the second parallel meshing gear having a relatively large diameter and the second shaft, the device can be made compact without difficulty.

  For the purpose of providing a torque transmission coupling that can be made compact without difficulty and facilitating the layout design of the propeller shaft, the second parallel meshing gear of the second shaft is made relatively large in diameter. The torque transmission coupling is arranged so that the shaft is not juxtaposed in the vehicle width direction other than the third shaft.

[Power transmission device]
FIG. 1 is a longitudinal sectional view mainly including a gear of a power transmission device, and FIG. 2 is a lateral sectional view mainly including a shaft of the power transmission device.

  As shown in FIGS. 1 and 2, the transfer device 1 that is a power transmission device is disposed on the outer periphery of an axle intermediate shaft 3 that is one rotation shaft on the front wheel side. A distribution case 5 which is a case of the power transmission device 1 is attached to a bell housing on the transmission side which is a fixed side with a configuration described later. The transfer device 1 has a three-shaft structure including a connecting hollow shaft 7, a transmission intermediate shaft 9, and a rear wheel side output shaft 11. The connecting hollow shaft 7 constitutes a first shaft, the transmission intermediate shaft 9 constitutes a second shaft, and the rear wheel side output shaft 11 constitutes a third shaft, which are arranged sequentially in this order.

  The distribution case 5 includes a first case portion 13 that rotatably supports the connecting hollow shaft 7 and the transmission intermediate shaft 9, and a second case portion 15 that rotatably supports the rear wheel side output shaft 11. . The first case portion 13 includes a case body 16 and a case cover 17.

  A mating surface 19 is provided on the case body 16, and a body-side fastening portion 20 is provided on the mating surface 19 so as to surround the shaft center of the coupling hollow shaft 7 and the transmission intermediate shaft 9. A matching surface 21 and a cover side fastening portion 22 corresponding to the case cover 17 are also formed. The mating surface 21 of the case cover 17 is abutted against the mating surface 19 of the case body 16, and the fastening portions 20 and 22 are fastened by bolts, and the case cover 17 is fixed to the case body 16.

  The first case portion 13 forms first and second accommodating portions 23 and 24, and upper and lower mounting bracket portions 29 and 28 are formed outside the case body 16. A case side mounting fastening portion 30 is formed on the mounting bracket portions 29 and 28.

  The case-side attachment fastening portion 30 of the attachment bracket portion 29 is disposed at the upper portion so as to straddle the axis of the transmission intermediate shaft 9.

  For this reason, the distribution case 5 can be supported by the heavy transmission intermediate shaft 9 portion to which the torque transmission coupling 93 and the large-diameter helical spur gear 25 and the ring gear 27 are attached. In addition, it is possible to suppress sound vibration.

  Moreover, one of the case side mounting fastening portions 30 of the mounting bracket portion 28 is disposed on the lower side of the shaft center of the transmission intermediate shaft 9, and both of the case side mounting fastening portions 30 of the mounting bracket portion 28 are connected to the connecting hollow shaft 7. It is arranged at the lower part so as to straddle the axis.

  For this reason, the heavy transmission intermediate shaft 9 side and the connecting hollow shaft 7 can be reliably supported by the mounting bracket portion 28, and sound vibration can be suppressed.

  The mounting bracket portions 29 and 28 are abutted against the mounting portion of the bell housing on the transmission side, and the case side mounting fastening portion 30 is fastened to the mounting fastening portion of the bell housing with a bolt or the like to distribute the transfer device 1. Case 5 is attached to the bell housing.

  The 1st accommodating part 23 accommodates the helical spar gear 25 which is the connection hollow shaft 7 and the 1st parallel meshing gear. The second accommodating portion 24 includes the transmission intermediate shaft 9, the helical spur gear 26 that is the second parallel meshing gear, the ring gear 27 and the pinion gear 32 that are the first and second orthogonal meshing gears. Accommodate.

  In the first housing portion 23, a bearing support portion 31 and a seal support portion 33 are provided on the case body 16 on one side in the axial direction of the helical spar gear 25, and bearing support is provided on the other side of the helical spar gear 25. A portion 35 and a seal support portion 37 are provided on the case cover 17.

  The connecting hollow shaft 7 in which the helical spar gear 25 is integrally provided on the bearing support portions 31 and 35 is rotatably supported by ball bearings 39 and 41. Oil seals 43 and 45 are attached to the seal support portions 33 and 37 of the first housing portion 23 as seals. The oil seals 43 and 45 are in close contact with the outer periphery of the connecting hollow shaft 7 and can slide relative to each other. It has become. An oil seal 47 is supported by the seal support portion 37 on the outer side in the axial direction of the oil seal 45, and is in close contact with the outer periphery of the axle intermediate shaft 3 so as to be relatively slidable.

  The coupling spline portion 49 formed on the outer periphery on one end side of the connecting hollow shaft 7 is spline-engaged with the differential case side 52 of the front differential device at the opening 51 at one end of the first housing portion 23. .

  A spiral groove 55 is provided on the inner peripheral side of the other end 53 of the connecting hollow shaft 7.

  The second accommodating portion 24 has a closed wall portion 57 in the case main body 16 on one end side of the transmission intermediate shaft 9, and a closed wall portion 59 in the case cover 17 on the other end side of the transmission intermediate shaft 9. .

  The closed wall portion 57 is provided with a bearing support portion 61, and the closed wall portion 59 is provided with a bearing support portion 63. Both ends of the transmission intermediate shaft 9 are rotatably supported by bearing support portions 61 and 63 via taper roller bearings 65 and 67.

  Details of the transmission intermediate shaft 9, the torque transmission coupling 93, and the ring gear 27 will be described later.

  The second case portion 15 supports the rear wheel side output shaft 11 and includes a shaft support portion 69 and an extension portion 71.

  The second case portion 15 is assembled by fitting one end of the shaft support portion 69 into the opening 73 of the second housing portion 24 of the first case portion 13 and is fastened and fixed by a bolt (not shown).

  An O-ring 75 is attached to the outer periphery of one end of the shaft support 69 and is in close contact with the inner periphery of the opening 73. An extension portion 71 is fastened to the other end portion of the shaft support portion 69. An O-ring 77 is supported on the other end of the shaft support 69 and is in close contact with the end surface of the extension 71. An oil passage 79 is formed in the extension portion 71, and a breather pipe 80 is attached.

  The shaft support portion 69 of the second case portion 15 is provided with bearing support portions 81 and 83, and the extension portion 71 is provided with a seal support portion 85.

  The rear wheel side output shaft 11 is rotatably supported by the bearing support portions 81 and 83 via taper roller bearings 86 and 87. The taper roller bearing 87 is fastened by a nut 89 that is screwed to the rear wheel side output shaft 11, and pre-load is applied to the taper roller bearings 86 and 87.

  An oil seal 91 is attached to the seal support portion 85, and the oil seal 91 is in close contact with a flange member that is spline-coupled to the spline 92 of the rear wheel side output shaft 11 so as to be capable of relative sliding. A dust cover 93 is attached to the outer peripheral side of the seal support portion 85 and covers the outer peripheral side of the oil seal 91.

  A pinion gear 32 that is a second orthogonal meshing gear is integrally provided at one end of the rear wheel side output shaft 11 and meshed with the ring gear 27.

Accordingly, the connecting hollow shaft 7 and the transmission that are rotatably supported by the distribution case 5 (case) and arranged in parallel with each other and can be interlocked by the helical spur gears 25 and 26 (first and second parallel meshing gears). An intermediate shaft 9 (first and second shafts) and a ring gear 27 and a pinion that are rotatably supported by the distribution case 5 (case) and are arranged to intersect the transmission intermediate shaft 9 (second shaft). A rear wheel side output shaft 11 (third shaft) that is linked to the transmission intermediate shaft 9 (second shaft) by the gear 32 (first and second orthogonal meshing gears) and can output to the propeller shaft. It is the composition provided with.
[Torque transmission coupling]
The helical spar gear 26 of the transmission intermediate shaft 9 has a larger diameter than the helical spar gear 25 of the connecting hollow shaft 7, and the inner diameter side of the helical spar gear 26 and the transmission intermediate shaft 9 A torque transmission coupling 93 that controls transmission of driving force from the helical spur gear 26 to the transmission intermediate shaft 9 is provided therebetween.

  The transmission intermediate shaft 9 has a clutch hub portion 95 formed in a stepped shape at the intermediate portion. The clutch hub portion 95 is formed of a spline. Case fitting shaft portions 97 and 99 are formed on both sides of the clutch hub portion 95. A gear coupling spline 101 is formed adjacent to the case fitting shaft portion 97. Support shaft portions 103 and 105 are formed adjacent to the case fitting shaft portion 99 and the gear coupling spline 101. The transmission intermediate shaft 9 has the support shaft portions 103 and 105 at both ends connected to the tapered roller bearings 65 and 67. Via the second accommodating portion 24.

  In the ring gear 27, an inner spline 107 is splined to the gear coupling spline 101 of the transmission intermediate shaft 9. On the back surface of the ring gear 27, a rotation support portion 109 is provided in a circular shape. In this embodiment, the rotation support portion 109 is a circular gripping portion when gearing the hypoid gear of the ring gear 27.

  The torque transmission coupling 93 includes a coupling case 111. The coupling case 111 is rotatable relative to the transmission intermediate shaft 9. The coupling case 111 includes a coupling case main body 113 and a coupling case cover 115. The coupling case main body 113 and the coupling case cover 115 are integrally and tightly coupled by welding or the like.

  The helical spar gear 26 is integrally formed on the outer periphery of the coupling case main body 113 and meshes with the helical spar gear 25 of the connecting hollow shaft 7. A clutch inner spline 116 is provided on the inner periphery of the coupling case main body 113. On the side of the coupling case main body 113, a rotation receiving portion 117 is provided by a circular recess. The rotation receiving portion 117 is supported by the rotation support portion 109 of the ring gear 27 via a bush 119 so as to be relatively rotatable.

  X-rings 121 and 123 that can withstand high temperature and pressure are supported as seal members on the inner periphery of the coupling case main body 113 and the coupling case cover 115.

  Inner peripheral portions of the coupling case main body 113 and the coupling case cover 115 are fitted to the case fitting shaft portions 97 and 99 of the transmission intermediate shaft 9, and the X rings 121 and 123 are arranged as the case fitting shaft. Close to parts 97,99. A rotation receiving portion 125 having a circular shape is formed on the inner peripheral side portion of the coupling case cover 115 and is rotatably supported by the case fitting shaft portion 99 of the transmission intermediate shaft 9 via a bush 127. ing.

Thus, a sealed chamber 129 having the clutch hub portion 95 and the clutch inner spline 116 is formed between the transmission intermediate shaft 9 and the coupling case 111. A clutch inner plate is spline-engaged with the clutch hub portion 95. A clutch outer plate is spline-engaged with the clutch inner spline 116. A viscous fluid such as silicon oil is sealed in the sealed chamber 129. Thus, the torque transmission coupling 93 is configured.
[Driving force transmission]
The driving force transmitted from the engine to the front differential device via the transmission is output on the one hand from the left and right side gears to the front wheel axle, and on the other hand from the differential case to the connecting hollow shaft 7.

  From the coupling hollow shaft 7, it is input to the coupling case 111 of the torque transmission coupling 93 through the meshing of the helical spur gears 25 and 26.

  If differential rotation occurs between the coupling case 111 and the transmission intermediate shaft 9 due to slippage of the front wheel, etc., between the clutch outer plate and the clutch inner plate of the torque transmission coupling 93 according to the differential rotation speed. Viscous resistance of the viscous fluid acts on the driving force transmission from the coupling case 111 to the transmission intermediate shaft 9 on demand.

  From the transmission intermediate shaft 9, the driving force is transmitted to the rear wheel side output shaft 11 by the engagement of the ring gear 27 and the pinion gear 32, and output from the rear wheel side output shaft 11 to the propeller shaft.

Accordingly, the driving force is transmitted from the rear differential device to the left and right rear wheels, and the vehicle can travel in an on-demand four-wheel drive state.
[Lubrication, etc.]
Lubricating oil is accommodated in the distribution case 5 up to a height near where the teeth of the helical spur gear 26 are immersed below the center of rotation of the transmission intermediate shaft 9.

  When the ring gear 27 rotates during power transmission, the lubricating oil is scraped up by the ring gear 27, and each part can be accurately lubricated by the scattered lubricating oil.

Further, the lubricating oil absorbs heat from the coupling case 111, suppresses the heat generation of the torque transmission coupling 93, and allows appropriate on-demand driving force control to be performed.
[Effect of Example]
In the transfer device 1 according to the embodiment of the present invention, the connecting hollow shaft 7 and the transmission intermediate shaft 9 that are rotatably supported by the distribution case 5 and arranged in parallel with each other and interlocked by the helical spur gears 25 and 26, Rear wheel side that is rotatably supported by the distribution case 5 and is arranged so as to intersect the transmission intermediate shaft 9 and is linked to the transmission intermediate shaft 9 by the ring gear 27 and the pinion gear 32 and can output to the propeller shaft. The helical spar gear 26 of the transmission intermediate shaft 9 has a larger diameter than the helical spar gear 25 of the connecting hollow shaft 7, and the inner diameter side of the helical spar gear 26 is provided. And a transmission intermediate shaft 9, a torque transmission coupling 93 that controls transmission of driving force from the helical spur gear 26 to the transmission intermediate shaft 9 is provided.

  For this reason, although the torque transmission coupling 93 can be provided to perform on-demand four-wheel drive running, the shaft is not provided in parallel in the vehicle width direction other than the rear wheel side output shaft 11, and the propeller・ Design to arrange the shaft in the center in the vehicle width direction becomes easy.

  When transmitting the driving force, the helical spar gear 26 has a large diameter with respect to the helical spar gear 25 and decelerates between the two. In response to this deceleration, the ring gear 27 is moved with respect to the pinion gear 32. To increase the speed. Moreover, the speed increasing ratio between the ring gear 27 and the pinion gear 32 is made larger than the speed reducing ratio between the helical spur gears 25 and 26. Therefore, the driving force output from the rear wheel side output shaft 11 can be appropriately increased with respect to the driving force input to the connecting hollow shaft 7.

  Since the diameter of the ring gear 27 is increased in accordance with the increase in the diameter of the helical spar gear 26, there is no problem in terms of space.

  Further, since the torque transmission coupling 93 is provided between the inner diameter side of the helical spar gear 26 having a relatively large diameter with respect to the helical spar gear 25 and the transmission intermediate shaft 9, the device can be easily operated. It can be made compact.

  The torque transmission coupling 1 includes a coupling case 111 that can rotate relative to the transmission intermediate shaft 9, and the helical spar gear 26 is provided on the outer periphery of the coupling case 111, A rotation receiving portion 117 is provided on a side portion of the coupling case 111, a rotation support portion 109 is provided on the ring gear 27 of the transmission intermediate shaft 9, and the rotation receiving portion 117 of the coupling case 111 is The rotation support portion 109 of the ring gear 27 was supported so as to be relatively rotatable.

  For this reason, the support of the coupling case 111 with respect to the transmission intermediate shaft 9 can be stabilized, and the driving force transmission control can be accurately performed.

  The rotation support portion 109 of the ring gear 27 is a grip portion for processing the hypoid gear of the ring gear 27.

  For this reason, the process of the special part for the rotation support part 109 becomes unnecessary, and can manufacture easily.

  The distribution case 5 was supported on the bell housing side above the transmission intermediate shaft 9.

For this reason, the distribution case 5 can be supported by the heavy transmission intermediate shaft 9 portion to which the torque transmission coupling 93 and the large-diameter helical spur gear 25 and the ring gear 27 are attached. In addition, it is possible to suppress sound vibration.
[Others]
The torque transmission coupling 93 can be applied to an on / off type such as an electromagnetic clutch or a hydraulic clutch in addition to an on-demand type such as a viscous coupling enclosing a viscous fluid.

It is sectional drawing of the vertical direction mainly having the gear of the transfer apparatus. Example 1 It is sectional drawing of a horizontal direction centering on the axis | shaft of a transfer apparatus. Example 1

Explanation of symbols

1 Transfer device (power transmission device)
5. Distribution case (case)
7 Connecting hollow shaft (first shaft)
9 Transmission intermediate shaft (second shaft)
11 Rear wheel output shaft (third shaft)
25 Helical spur gear (first parallel meshing gear)
26 Helical spur gear (second parallel meshing gear)
27 Ring gear (first orthogonal meshing gear)
32 pinion gear (second orthogonal meshing gear)
93 Torque transmission coupling 109 Rotation support portion 113 Coupling case 117 Rotation receiving portion

Claims (4)

First and second shafts rotatably supported by the case and arranged in parallel with each other and interlocked by first and second parallel meshing gears;
A third shaft that is rotatably supported by the case and arranged so as to intersect with the second shaft, and is linked to the second shaft by the first and second orthogonal meshing gears and can output to the propeller shaft. And
The second parallel meshing gear of the second shaft has a larger diameter than the first parallel meshing gear of the first shaft,
A torque transmission coupling for controlling driving force transmission from the second parallel meshing gear to the second shaft is provided between the inner diameter side of the second parallel meshing gear and the second shaft.
A power transmission device characterized by that. The power transmission device according to claim 1,
The torque transmission coupling includes a coupling case rotatable relative to the second shaft;
Provide the second parallel mesh gear on the outer periphery of the coupling case,
A rotation receiving part is provided on the side of the coupling case,
A rotation support portion is provided on the first orthogonal meshing gear of the second shaft,
The rotation receiving portion of the coupling case is supported by the rotation support portion of the first orthogonal meshing gear so as to be relatively rotatable.
A power transmission device characterized by that. The power transmission device according to claim 2,
The rotation support portion of the first orthogonal meshing gear is a grip portion during gear processing.
A power transmission device characterized by that. The power transmission device according to any one of claims 1 to 3,
The case is supported on the stationary side above the second shaft,
A power transmission device characterized by that.

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