JP2008185071A - Power transmission device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a power transmission device in which a stable intermissive characteristic can be obtained in a differential limiting mechanism. <P>SOLUTION: The power transmission device 1 is equipped with a differential mechanism which performs distribution from an input member to a pair of output members, a differential limiting mechanism 11 which limits differential rotation of the differential mechanism, a transducing mechanism 17 which is arranged between the differential mechanism and the differential limiting mechanism 11 and includes a hollow shaft 13 that is coupled to the input member of the differential mechanism and branches drive power to transmit the drive power branched and a case 15 that supports the hollow shaft 13, and a drive shaft 19 whose one end penetrates a shaft center of the hollow shaft 13 to be coupled to one of the output members of the differential mechanism and whose other end protrudes outside the case 15. In the power transmission device, the differential limiting mechanism 11 is equipped with a clutch hub 21 which is coupled to the outer circumference of the drive shaft 19 and is supported thereto; a clutch housing 23 and a rotor clutch 25 which are coupled to the hollow shaft 13 and are supported by the outer circumference of the clutch hub 21, and a multi-disc clutch 27 arranged between the clutch hub 21 and the clutch housing 23, the rotor clutch 25. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a power transmission device used in a vehicle.

Patent Document 1 describes a power transmission device including a differential mechanism, a hollow shaft, a multi-plate clutch, and a drive shaft. In this power transmission device, the hollow shaft and the drive shaft are connected to a differential mechanism, and differential limitation of the differential mechanism is performed by a multi-plate clutch. This multi-plate clutch has a clutch housing connected to a hollow shaft and a clutch hub connected to a drive shaft, and the differential mechanism is limited by connecting the clutch housing and the clutch hub. Yes.
Japanese Patent Laid-Open No. 2004-314796

  Incidentally, in the above power transmission device, the clutch housing is supported by the hollow shaft, the clutch hub is supported by the drive shaft, and the entire multi-plate clutch is disposed on the outer peripheral side of the drive shaft.

  However, if the clutch housing and the clutch hub are supported by separate members in this way, the radial support of the entire multi-plate clutch with respect to the drive shaft becomes unstable, and the multi-plate clutch is caused by vibration during vehicle travel. There was a possibility that the intermittent characteristics of the would become unstable.

  Therefore, an object of the present invention is to provide a power transmission device that can obtain a stable intermittent characteristic of a differential limiting mechanism.

  The invention according to claim 1 is a differential mechanism that distributes an input driving force from an input member to a pair of output members, a differential limiting mechanism that limits differential rotation of the differential mechanism, the differential mechanism, and the differential mechanism A conversion mechanism having a hollow shaft connected to an input member of the differential mechanism and branching and transmitting the driving force and a case supporting the hollow shaft; A power transmission device including a shaft member that penetrates the axis of the shaft and is connected to one of the pair of output members, and the other end protrudes to the outside of the case, wherein the differential limiting mechanism includes: An inner peripheral member connected to and supported by the outer periphery of the shaft member; an outer peripheral member connected to the hollow shaft and supported by the outer periphery of the inner peripheral member; and the inner peripheral member and the outer peripheral member. And an intermittent member disposed therebetween.

  The invention according to claim 2 is the power transmission device according to claim 1, wherein the outer diameter of the other end side of the shaft member is smaller than the inner diameter of the inner peripheral side member.

  A third aspect of the present invention is the power transmission device according to the first or second aspect, wherein the shaft member is supported on the hollow shaft via a bearing.

  A fourth aspect of the present invention is the power transmission device according to any one of the first to third aspects, wherein the inner peripheral side member is attached to the other end side end portion of the shaft member via a fixing member. Directional positioning is performed.

  A fifth aspect of the present invention is the power transmission device according to any one of the first to fourth aspects, wherein a seal having a lip portion is disposed between the case and the outer peripheral side member, and the lip The portion is in contact with a circumferential surface of the outer peripheral member.

  A sixth aspect of the present invention is the power transmission device according to any one of the first to fifth aspects, wherein the differential limiting mechanism is controlled by a control means disposed on an outer periphery on the other end side of the shaft member. The control means includes an electromagnet, and the electromagnet is prevented from rotating by a stationary member disposed on the other end side of the shaft member with respect to the differential limiting mechanism.

  A seventh aspect of the present invention is the power transmission device according to any one of the fourth to sixth aspects, wherein an annular convex portion is provided in an axially intermediate portion of the shaft member, and the inner peripheral side member Is characterized in that axial positioning is performed between the fixing member and the convex portion.

  Invention of Claim 8 is a power transmission device of Claim 7, Comprising: The 1st clearance gap set to an axial direction between the said inner peripheral side member and the said outer peripheral side member is the said outer peripheral side member. It is set narrower than the 2nd clearance gap set between the said cases.

  A ninth aspect of the present invention is the power transmission device according to any one of the sixth to eighth aspects, wherein a cover member is provided between the electromagnet and the case. .

  In the power transmission device according to the first aspect, the outer peripheral member of the differential limiting mechanism is supported by the inner peripheral member, and the inner peripheral member is connected and supported by the shaft member. The shaft member can be supported.

  Therefore, the radial support of the entire differential limiting mechanism with respect to the shaft member is stabilized, and a stable intermittent characteristic of the differential limiting mechanism can be obtained.

  Further, since the differential limiting mechanism can be handled as one unit by the inner peripheral side member, the differential limiting mechanism can be easily positioned and the assembling property with respect to the shaft member can be improved.

  In the power transmission device according to the second aspect, since the outer diameter of the other end side of the shaft member is smaller than the inner peripheral diameter of the inner peripheral side member, the differential limiting mechanism is pivoted even after the shaft member is connected to the differential mechanism. It can be removed from the other end side of the member, and the assembling property of the differential limiting mechanism can be improved.

  In the power transmission device according to the third aspect, since the shaft member is supported by the hollow shaft via the bearing, the rotational vibration of the shaft member can be suppressed, and the influence on the members disposed around the shaft member can be suppressed. Can be suppressed.

  In the power transmission device according to the fourth aspect, since the inner peripheral side member is positioned in the axial direction via the fixing member at the other end side end portion of the shaft member, the differential limiting mechanism is securely connected in the axial direction of the shaft member. Can be positioned. Further, the entire differential limiting mechanism does not move in the axial direction toward the fixed member, and the intermittent characteristics of the differential limiting mechanism can be stabilized.

  In the power transmission device according to the fifth aspect, the lip portion of the seal disposed between the case and the outer peripheral side member is in contact with the circumferential surface of the outer peripheral side member. Can be reliably sealed, and foreign matter can be reliably prevented from being mixed into the intermittent member.

  In the power transmission device according to the sixth aspect, since the control means having the electromagnet is disposed on the other end side of the shaft member with respect to the differential limiting mechanism, the control means and the difference are not detected even after the shaft member is connected to the differential mechanism. The movement limiting mechanism can be removed from the other end side of the shaft member, and the assemblability of the control means and the differential limiting mechanism can be improved. Moreover, since the electromagnet is prevented from rotating by the stationary member, the energization function of the electromagnet can be stabilized.

  In the power transmission device according to the seventh aspect, since the inner peripheral member is positioned in the axial direction between the fixed member and the convex portion, the inner peripheral member in the differential limiting mechanism can be reliably positioned. it can.

  In the power transmission device according to claim 8, the first gap set in the axial direction between the inner peripheral member and the outer peripheral member is narrower than the second gap set between the outer peripheral member and the case. Since it is set, when the outer peripheral member moves in the axial direction, contact between the outer peripheral member and the case can be prevented.

  In the power transmission device according to the ninth aspect, since the cover member is provided between the electromagnet and the case of the conversion mechanism, dust or the like can enter the differential limiting mechanism disposed between the electromagnet and the conversion mechanism. Can be prevented.

  First, a power system of a vehicle to which the power transmission device of each embodiment is applied will be described with reference to FIG. In addition, although the power transmission device 1 of 1st Embodiment is used, it is the same also about the power system of the vehicle to which the power transmission device of other embodiment is applied.

  As shown in FIG. 1, a vehicle power system includes a horizontally installed engine 301 as a drive source and a transmission 303 as a speed change mechanism, front axles 305 and 307, front wheels 309 and 311, a power transmission device 1, A rear-wheel propeller shaft 313, a coupling 315 that intermittently controls driving force transmitted from the front-wheel side to the rear-wheel side, a rear differential 317, rear axles 319 and 321, rear wheels 323 and 325, and the like. Has been.

  The driving force of the engine 301 is transmitted from the transmission 303 to the front differential 9 (differential mechanism) through the differential case 3 (input member), and from the pair of side gears 5 and 7 (a pair of output members) to the drive shaft 19 (shaft member). Is distributed from the front axles 305 and 307 to the front wheels 309 and 311, and the driving force transmitted to the hollow shaft 13 connected to the differential case 3 is branched off from the conversion mechanism 17 via the rear wheel side propeller shaft 313. When it is transmitted to the coupling 315 and the coupling 315 is connected, it is transmitted to the rear differential 317, and is distributed from the rear axles 319 and 321 to the rear wheels 323 and 325 to be in a four-wheel drive state. When the connection of the coupling 315 is released, the vehicle enters a two-wheel drive state of front wheel drive.

  The differential limitation of the front differential 9 is performed by the differential limiting mechanism 11. Hereinafter, the power transmission device 1 will be described.

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

  The power transmission device 1 according to the present embodiment has a difference between a front differential 9 (differential mechanism) that distributes an input driving force from a differential case 3 (input member) to a pair of side gears 5 and 7 (output member), and the front differential 9. A differential limiting mechanism 11 that limits dynamic rotation, a hollow shaft 13 that is disposed between the front differential 9 and the differential limiting mechanism 11 and that is connected to the differential case 3 of the front differential 9 and transmits the driving force in a branched manner. A conversion mechanism 17 having a case 15 that supports the shaft 13, a drive in which one end passes through the shaft center of the hollow shaft 13 and is connected to the side gear 7 (one of the output members), and the other end protrudes outside the case 15. And a shaft 19 (shaft member). The differential limiting mechanism 11 includes a clutch hub 21 (inner peripheral side member) connected and supported on the outer periphery of the drive shaft 19, and a clutch housing 23 (connected to the hollow shaft 13 and supported on the outer periphery of the clutch hub 21. An outer peripheral side member) and a rotor clutch 25 (outer peripheral side member), and a multi-plate clutch 27 (intermittent member) disposed between the clutch hub 21, the clutch housing 23 and the rotor clutch 25.

  As shown in FIG. 1, the front differential 9 includes a differential case 3, a pair of side gears 5, 7, a pinion shaft 29, and a pinion gear 31.

  The differential case 3 is rotatably supported by the transmission case 331 via a pair of bearings 327 and 329. The differential case 3 has a gear set 333, and the driving force from the engine 301 is shifted by the transmission 303 and input to the differential case 3 through the gear set 333, and the driving force is distributed to the pair of side gears 5 and 7. Yes. Further, the hollow shaft 13 of the conversion mechanism 17 is splined to the end of the differential case 3 by a connecting portion 14 (FIG. 2).

  The pair of side gears 5 and 7 is rotatably supported by the differential case 3 and meshes with the pinion gear 31. The side gear 7 is connected to one end of a drive shaft 19 that passes through the hollow shaft 13 by a spline portion 20 (FIG. 2).

  The pinion shaft 29 is rotationally driven integrally with the differential case 3 with both ends engaged with the differential case 3. The pinion gear 31 transmits the driving force to the pair of side gears 5 and 7 and is supported so as to be able to rotate when the differential rotation occurs between the pair of side gears 5 and 7 engaged with each other.

  The driving force of the front differential 9 is transmitted to the conversion mechanism 17 via the hollow shaft 13 connected to the differential case 3.

  As shown in FIG. 2, the conversion mechanism 17 includes a hollow shaft 13, a case 15, and a direction change gear set 33.

  Both ends of the hollow shaft 13 are supported by side walls 54 and 56 at both axial ends of the case 15 via a pair of bearings 35 and 37. A ring gear 39 is fixed to the hollow shaft 13 with bolts 41. The ring gear 39 meshes with a drive pinion gear 43 connected to the rear wheel side propeller shaft 313 (FIG. 1). These ring gear 39 and drive pinion gear 43 constitute a direction changing gear set 33.

  The drive pinion gear 43 is provided integrally with a shaft 45 connected to the rear wheel side propeller shaft 313. The shaft 45 is supported by the case 15 via bearings 47 and 49 that are spaced apart in the axial direction. A connecting member 51 is connected to the end of the shaft 45, and the connecting member 51 is connected to the rear wheel side propeller shaft 313 via a joint flange. By this direction change gear set 33, the driving force of the engine 301 (FIG. 1) input to the hollow shaft 13 is branched and transmitted to the coupling 315 (FIG. 1) side via the rear wheel side propeller shaft 313. .

  The hollow shaft 13 and the direction change gear set 33 are accommodated in a case 15 attached to a transmission case 331 (FIG. 1).

  The case 15 includes a plurality of housings 53, 55, 57, and 59, and O-rings 61, 63, and 65 that are seal members are disposed at joint portions of the housings, and the case 15 and the transmission case 331 are disposed. An O-ring 67 is also disposed at the joint portion. Further, seals 69, 87, and 71 are disposed between the case 15 and the hollow shaft 13 and between the case 15 and the connecting member 51, respectively, to partition the inside and the outside of the case 15. A drive shaft 19 is passed through the case 15.

  One end of the drive shaft 19 passes through the axial center of the case 15 and the hollow shaft 13 and is connected to the side gear 7 (FIG. 1), and the other end is connected to the constant velocity joint member 308 (FIG. 1) on the front axle 307 (FIG. 1) side. 1) and a spline portion 22. Since the drive shaft 19 is long, the outer periphery thereof is supported by the inner periphery of the hollow shaft 13 via a bearing 73 (bearing). A portion of the drive shaft 19 where the bearing 73 is disposed is provided with an annular protrusion 75 that abuts the bearing 73 and positions the clutch hub 21 of the differential limiting mechanism 11 in the axial direction via the bearing 73. Yes. A differential limiting mechanism 11 for limiting the differential rotation of the front differential 9 (FIG. 1) is disposed on the outer periphery of the drive shaft 19.

  As shown in FIGS. 3 and 4, the differential limiting mechanism 11 includes a clutch hub 21, a clutch housing 23 and a rotor clutch 25, a multi-plate clutch 27, a cam mechanism 77, and a pilot clutch 79. Controlled by means 81.

  The clutch hub 21 is splined to the drive shaft 19 at a spline portion formed on the inner peripheral side, and is rotated integrally with the side gear 7 of the front differential 9. One end portion of the clutch hub 21 is positioned in the axial direction by a convex portion 75 of the drive shaft 19 via a bearing 73. Further, the other end portion is positioned in the axial direction by a snap ring 83 (fixing member) as a retaining ring fixed to the drive shaft 19 and is prevented from coming off from the other end side of the clutch hub 21. . The fixing member is not limited to the snap ring 83, and other members such as a nut and a C ring may be used. The inner peripheral diameter of the clutch hub 21 is set to be slightly larger than the outer diameter R1 on the other end side of the drive shaft 19. Thereby, the clutch hub 21 can be removed from the drive shaft 19 even after the drive shaft 19 is assembled. A clutch housing 23 and a rotor clutch 25 are supported on the outer periphery of the clutch hub 21.

  The clutch housing 23 is supported on the outer periphery on one end side of the clutch hub 21 via a support portion 24 (may be via a sliding bush), and a spline portion 28 formed on the outer peripheral side of one end in the axial direction of the hollow shaft 13. It is spline-connected by the connecting portion 30 to the inner periphery of the cylindrical portion located at the end, and is rotated integrally with the differential case 3 (FIG. 1) of the front differential 9. Further, the connecting portion 30 is located on the inner peripheral side of the bearing 37, and a bearing 73 is disposed in close proximity to one end side in the axial direction of the spline portion 28 in the connecting portion 30 to save space. Yes. A seal 87 having a lip portion 85 is disposed between the clutch housing 23 and the case 15. The lip portion 85 is in contact with the outer peripheral surface of the recess 89 formed in the clutch housing 23. The lip 85 may be brought into contact with the inner peripheral surface of the recess 89. In addition, an X ring 91 is disposed between the clutch housing 23 and the clutch hub 21, and a predetermined amount of lubricating oil suitable for the multi-plate clutch 27 is enclosed in a chamber surrounded by the clutch housing 23 and the clutch hub 21. Has been. A screw portion 93 is formed on the outer peripheral side of the clutch housing 23, and the rotor clutch 25 is screwed to the screw portion 93.

  The rotor clutch 25 is supported on the outer periphery on the other end side of the clutch hub 21 via a support portion 26 (or via a sliding bush), and supports an electromagnet 97 of the control means 81 via a seal bearing 95. . The rotor clutch 25 is fixed to the clutch housing 23 by a double nut function in which a screw member 96 is screwed to an end portion of the screw portion 93 while being screwed to the screw portion 93 of the clutch housing 23. Since the screw member 96 is arranged not on the control means 81 side of the end of the clutch housing 23 but on the outer peripheral side of the multi-plate clutch 27, the overhang to the control means 81 is suppressed and the axial direction is made compact. Yes. An O-ring 99 and an X-ring 101 are disposed between the rotor clutch 25 and the clutch housing 23 and between the rotor clutch 25 and the clutch hub 21, respectively. Since the O-ring 99 is disposed on the outer periphery of the end portion of the clutch housing 23, the thickness of the end portion 100 of the clutch housing 23 is reduced by the arrangement concave portion of the O-ring 99, and the leakage of magnetic lines of force described later is suppressed. The first gap 103 set in the axial direction between the rotor clutch 25 and the clutch hub 21 is set narrower than the second gap 105 set between the clutch housing 23 and the case 15. Thereby, even if the clutch housing 23 moves in the axial direction in the vehicle running state, the clutch housing 23 and the case 15 are prevented from contacting each other.

  A multi-plate clutch 27, a cam mechanism 77, and a pilot clutch 79 are disposed between the clutch hub 21, the clutch housing 23, and the rotor clutch 25.

  The multi-plate clutch 27 is composed of a plurality of clutch plates connected to the outer periphery of the clutch hub 21 and the inner periphery of a steel clutch housing 23. When the multi-plate clutch 27 is engaged, the clutch hub 21 and the clutch housing 23 are connected, that is, the differential case 3 of the front differential 9 and the side gear 7 are connected, and differential rotation at the front differential 9 is restricted. The multi-plate clutch 27 is fastened when a cam thrust force is generated by the cam mechanism 77. In addition, the sliding bush arrange | positioned at the support parts 24 and 26 is formed with nonmagnetic materials, such as an aluminum material and a copper material.

  The cam mechanism 77 includes a pressure plate 107, a cam ring 109, and a cam ball 111. The pressure plate 107 is connected to the outer periphery of the clutch hub 21 so as to be axially movable. The cam ring 109 is supported on the outer periphery of the clutch hub 21 so as to be movable in the axial direction, and a needle bearing 113 that receives the thrust force of the cam ring 109 is disposed on the back side. Further, a clutch plate of a pilot clutch 79 is connected to the outer peripheral side of the cam ring 109. The cam ball 111 is disposed between the pressure plate 107 and the cam ring 109, and moves the pressure plate 107 and the cam ring 109 in the axial direction when a differential rotation occurs between the pressure plate 107 and the cam ring 109. As the pressure plate 107 moves, the multi-plate clutch 27 is fastened. The cam thrust force of the cam mechanism 77 is generated by a pilot clutch 79.

  The pilot clutch 79 includes a plurality of clutch plates connected to the outer periphery of the cam ring 109 and the inner periphery of the clutch housing 23, and an armature 115 connected to the inner periphery of the clutch housing 23. In the pilot clutch 79, when the electromagnet 97 of the control means 81 is energized, the magnetic lines of force through the core 119, the rotor clutch 25, the pilot clutch 79, and the armature 115 are circulated like the magnetic line loop 98 shown in FIG. Is fastened by moving in the fastening direction of the pilot clutch 79, causing a differential rotation between the pressure plate 107 and the cam ring 109. The lines of magnetic force that slightly leak from the pilot clutch 79 to the clutch housing 23 are narrowed by the thin-walled portion 100 on the inner peripheral side of the recess in which the O-ring 99 is disposed, and the leakage of the lines of magnetic force is suppressed.

  The control means 81 includes an electromagnet 97 and a controller (not shown). The electromagnet 97 includes an electromagnetic coil 117 and a core 119, and is disposed on the other end side of the drive shaft 19. An anti-rotation member 121 is fixed to the core 119, and is prevented from rotating by an elastic body 124 to a stationary member 123 disposed on the other end side of the drive shaft 19 with respect to the differential limiting mechanism 11. In addition, a connector 125 connected to the controller side is connected to the core 119 and is energized by the control of the controller. By energizing the electromagnet 97, the pilot clutch 79 is engaged. 1 and 2, the lead wire including the connector 125 is taken out from the opposite side of the engine 301 with respect to the rotation axis of the differential limiting mechanism 11 so as to avoid the engine 301 serving as a heat source. It is arranged so that problems such as melting due to high heat do not occur.

  In such a power transmission device 1, the clutch housing 23, the rotor clutch 25, the multi-plate clutch 27, the cam mechanism 77, and the pilot clutch 79 of the differential limiting mechanism 11 are supported by the clutch hub 21. Since the drive shaft 19 is connected and supported, the entire differential limiting mechanism 11 can be supported by the drive shaft 19.

  Therefore, the radial support of the entire differential limiting mechanism 11 with respect to the drive shaft 19 is stabilized, and a stable intermittent characteristic of the differential limiting mechanism 11 can be obtained.

  Further, since the differential limiting mechanism 11 can be handled as one unit by the clutch hub 21, the differential limiting mechanism 11 can be easily positioned and the assembling property with respect to the drive shaft 19 can be improved.

  Further, since the outer diameter R1 on the other end side of the drive shaft 19 is smaller than the inner peripheral diameter of the clutch hub 21, the differential limiting mechanism 11 is connected to the other end of the drive shaft 19 even after the drive shaft 19 is connected to the side gear 7. It can be removed from the side, and the assembly of the differential limiting mechanism 11 can be improved.

  Further, since the drive shaft 19 is supported on the hollow shaft 13 via the bearing 73, the rotational vibration of the drive shaft 19 can be suppressed, and the influence on the members arranged around the drive shaft 19 can be suppressed. be able to.

  Furthermore, since the clutch hub 21 is axially positioned at the other end of the drive shaft 19 via the washer 83, the differential limiting mechanism 11 can be reliably positioned in the axial direction of the drive shaft 19. Further, the entire differential limiting mechanism 11 does not move in the axial direction, and the intermittent characteristics of the differential limiting mechanism 11 can be stabilized.

  In addition, since the lip portion 85 of the seal 87 disposed between the case 15 and the clutch housing 23 is in contact with the circumferential surface of the concave portion 89 of the clutch housing 23, the assembly accuracy of the differential limiting mechanism 11 is increased. Even if a possible axial misalignment occurs, the gap between the case 15 and the clutch housing 23 can be reliably sealed, and foreign matter can be reliably prevented from entering the case 15 and the multi-plate clutch 27. .

  Further, since the control means 81 having the electromagnet 97 is arranged on the other end side of the drive shaft 19 with respect to the differential limiting mechanism 11, the control means 81 and the differential limiting even after the drive shaft 19 is connected to the side gear 7. The mechanism 11 can be removed from the other end side of the drive shaft 19, and the assembling property of the control means 81 and the differential limiting mechanism 11 can be improved. Moreover, since the electromagnet 97 is prevented from rotating by the stationary member 123, the energization function of the electromagnet 97 can be stabilized.

  Further, since the clutch hub 21 is positioned in the axial direction between the washer 83 and the convex portion 75, the positioning of the clutch hub 21 in the differential limiting mechanism 11 can be performed reliably.

  Further, the first gap 103 set in the axial direction between the clutch hub 21 and the rotor clutch 25 is set narrower than the second gap 105 set between the clutch housing 23 and the case 15. When the clutch housing 23 moves in the axial direction, the contact between the clutch housing 23 and the case 15 can be prevented.

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

  In the power transmission device 201 of this embodiment, a cover member 203 in which O-rings 204 and 206 are interposed between the electromagnet 97 and the case 15 is provided. In addition, although the same code | symbol is described to the structure same as 1st Embodiment, description is abbreviate | omitted, Since it is the same structure as 1st Embodiment, the effect obtained is the same.

  As shown in FIG. 5, a cover member 203 is provided between the core 119 of the electromagnet 97 and the clutch housing 23 side of the case 15. This cover member 203 is provided so as to cover the entire differential limiting mechanism 11. The volume on the outer peripheral side of the clutch housing 23 is defined by the cover member 203 in an air space defined by one end in the axial direction by the seal 87 and partitioned by the seal bearing 95 at the other end in the axial direction. Here, an air gap is provided between the rotor clutch 25 and the core 119 of the electromagnet 97 in order to form a magnetic force line loop 98 by energizing the electromagnet 97. The cover member 203 prevents foreign matter from entering between the air gaps, prevents foreign matter from entering from the lip portion 85 of the seal 87, and does not require rust prevention treatment to the differential limiting mechanism 11. become.

  In such a power transmission device 201, since the cover member 203 is provided between the electromagnet 97 and the case 15, dust or the like is generated in the differential limiting mechanism 11 disposed between the electromagnet 97 and the conversion mechanism 17. In addition to preventing the clutch housing 23 from being exposed to the outside, the clutch housing 23 can be prevented from being damaged by pebbles scattered when the vehicle travels.

  In the present invention, the multi-plate clutch is used for the differential limiting mechanism. However, the present invention is not limited to this, and the transmission of the mutual driving force such as a dog clutch, a cone clutch, and a shear resistance of viscous fluid is intermittently transmitted. You can do it. In this case, since the differential limiting mechanism is stably supported in the radial direction with respect to the shaft member, the intermittent characteristics can be stabilized without affecting the transmission of the mutual driving force. Any differential limiting mechanism may be used as long as the differential rotation of the differential mechanism can be limited.

  Further, the control means is not limited to an electromagnet, and any control means may be used as long as it can intermittently connect a differential limiting mechanism such as a hydraulic actuator or an electric motor actuator.

It is the schematic which shows the motive power system of a vehicle. It is sectional drawing of the power transmission device of 1st Embodiment. It is a principal part expanded sectional view of the power transmission device of 1st Embodiment. It is a principal part expanded sectional view of the power transmission device of 1st Embodiment. It is a principal part expanded sectional view of the power transmission device of 2nd Embodiment.

Explanation of symbols

1,201 ... Power transmission device 3 ... Differential case (input member)
5, 7 ... Side gear (output member)
9 ... Front differential (differential mechanism)
DESCRIPTION OF SYMBOLS 11 ... Differential limiting mechanism 13 ... Hollow shaft 15 ... Case 17 ... Conversion mechanism 19 ... Drive shaft (shaft member)
21 ... Clutch hub (inner circumference side member)
23 ... Clutch housing (outer peripheral member)
25. Rotor clutch (outer peripheral member)
27. Multi-plate clutch (intermittent member)
33 ... Direction change gear set 73 ... Bearing (bearing)
75 ... convex part 81 ... control means 83 ... snap ring (fixing member)
85 ... Lip part 87 ... Seal 89 ... Concave 97 ... Electromagnet 103 ... First gap 105 ... Second gap 121 ... Non-rotating member 123 ... Stationary member 203 ... Cover member

Claims (9)

A differential mechanism that distributes input driving force from the input member to the pair of output members, a differential limiting mechanism that limits differential rotation of the differential mechanism, and between the differential mechanism and the differential limiting mechanism A conversion mechanism having a hollow shaft that is coupled to the input member of the differential mechanism and transmits the driving force in a branched manner, and a case that supports the hollow shaft, and one end penetrates the axis of the hollow shaft. A power transmission device comprising: a shaft member coupled to one of the pair of output members and the other end protruding to the outside of the case;
The differential limiting mechanism includes an inner peripheral member connected and supported on the outer periphery of the shaft member, an outer peripheral member connected to the hollow shaft and supported on the outer periphery of the inner peripheral member, and the inner peripheral side. A power transmission device comprising: an intermittent member disposed between the member and the outer peripheral side member. The power transmission device according to claim 1,
An outer diameter of the other end side of the shaft member is smaller than an inner diameter of the inner peripheral side member. The power transmission device according to claim 1 or 2,
The power transmission device, wherein the shaft member is supported by the hollow shaft via a bearing. The power transmission device according to any one of claims 1 to 3,
The power transmission device according to claim 1, wherein the inner circumferential member is axially positioned at the other end of the shaft member via a fixing member. The power transmission device according to any one of claims 1 to 4,
A seal having a lip portion is disposed between the case and the outer peripheral member, and the lip portion is in contact with a circumferential surface of the outer peripheral member. The power transmission device according to any one of claims 1 to 5,
The differential limiting mechanism is controlled by control means arranged on the outer periphery of the other end side of the shaft member, and the control means has an electromagnet, and the electromagnet is on the other end side of the shaft member with respect to the differential limiting mechanism. A power transmission device, characterized in that it is prevented from rotating by a stationary member arranged in the frame. The power transmission device according to any one of claims 4 to 6,
An annular projecting portion is provided at an axially intermediate portion of the shaft member, and the inner peripheral member is axially positioned between the fixed member and the projecting portion. apparatus. The power transmission device according to claim 7,
The first gap set in the axial direction between the inner peripheral member and the outer peripheral member is set narrower than the second gap set between the outer peripheral member and the case. A power transmission device characterized by that. The power transmission device according to any one of claims 6 to 8,
A power transmission device, wherein a cover member is provided between the electromagnet and the case.

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