JP4939798B2 - Power transmission device - Google Patents

Description

  The present invention relates to a power transmission device for intermittently driving a driving force between an outer rotating member and an inner rotating member.

  Patent Document 1 discloses a coupling 501 as an example of a power transmission device as shown in FIG.

  The coupling 501 includes a housing 503 serving as an outer rotating member, a hub 505 serving as an inner rotating member, a clutch device 507 using electromagnetic force for intermittently connecting them, and a power transmission shaft splined to the hub 505. A drive pinion shaft 509 is configured.

The drive pinion shaft 509 is supported on the differential carrier 519 by bearings 511 and 513, and the housing 503 is supported by bearings 515 and 517, respectively.
JP 2001-12507 A

  However, the coupling 501 has a small portion where the drive pinion shaft 509 overlaps in the radial direction with respect to the housing 503 and the hub 505, and is thus long and large in the axial direction. Therefore, the differential carrier 519 is also large. It must be heavy and costly, and the in-vehicle performance is likely to deteriorate.

  Further, since there are few overlapping portions as described above, the bearings 511 and 513 of the drive pinion shaft 509 and the bearings 515 and 517 of the housing 503 are arranged in the axial direction, and the support of the members 503 and 509 is that much. Prone to instability.

  Accordingly, an object of the present invention is to provide a power transmission device that is reduced in size in the axial direction and that supports a member stably.

The power transmission device according to claim 1 includes an outer rotating member that is rotatably disposed, an inner rotating member that is relatively rotatably disposed inside the outer rotating member, the outer rotating member, and the inner rotating member. It is supported on the housing member side by an intermittent clutch mechanism and two bearings consisting of first and second bearings that are spaced apart in the axial direction, and is connected to the inner rotating member via a connecting portion. and a power transmission shaft, the power transmission device housed in the housing member, the power transmission shaft, said inner rotary member through said one of said two bearings on one side of the first axial bearing wherein is supported on the outer rotary member, the second bearing of the two bearings in the axial direction of the other side is supported in the housing member, said outer rotary member, the axial direction by The first bearing supporting the power transmission shaft on the outer rotating member and the third bearing are radially overlapped by a third bearing on the side, The clutch mechanism is arranged between the first bearing and the second bearing in the axial direction.

Invention of Claim 2 is the power transmission device described in Claim 1, Comprising: It is located in the radial direction outer side of the support part by the said 1st bearing of the said power transmission shaft, and the said connection part, The said outer side rotation member, An oil space is formed by a seal disposed between the inner rotating member and the inner rotating member.

  In the power transmission device according to the first aspect, the power transmission shaft is passed through the inner rotary member, and these are overlapped in the radial direction, so that the radial overlap portion of the drive pinion shaft 509 with respect to the housing 503 and the hub 505 is small. Unlike the conventional example, it is greatly downsized in the axial direction. Therefore, the accommodating member is also made smaller, lighter, and lower in cost, and the in-vehicle performance is improved.

  Further, since the power transmission shaft is supported by the first and second bearings with a relatively long span after being compact in the axial direction, the supportability of the power transmission shaft, the inner rotating member, and the outer rotating member is stabilized.

  Further, the first bearing that supports the power transmission shaft and the third bearing that supports the outer rotating member are overlapped in the radial direction, thereby stabilizing the support of the power transmitting shaft and the outer rotating member. Therefore, the poor support of each member and the generation of abnormal noise and vibration due to the poor support are prevented.

  Note that the effects described above can be obtained if both bearings overlap in the radial direction.

The power transmission device according to the second aspect can achieve the same effects as the configuration according to the first aspect .

  Further, since the oil space is formed by arranging the seal between the outer rotating member and the inner rotating member, the lubrication / cooling effect and durability of the peripheral members are improved.

  In addition, since the oil space is formed on the radially outer side between the support portion and the connecting portion of the power transmission shaft, the support portion can be arranged.

<One Embodiment>
The power transmission device 1 will be described with reference to FIG. The left and right directions are the front and rear directions of a four-wheel drive vehicle using the power transmission device 1, and the left side in FIG. 1 corresponds to the front of the vehicle.

[Features of power transmission device 1]
The power transmission device 1 includes a housing 3 (an outer rotating member) that is rotatably arranged, a hollow hub 5 (an inner rotating member) that is relatively rotatably disposed inside the housing 3, and the housing 3 and the hub 5. A main clutch 7 (clutch mechanism) for intermittently connecting and disconnecting, and a power transmission shaft 11 (power transmission shaft) coupled to the hub 5 via a spline coupling portion 9 (coupling portion), and accommodated in a differential carrier 13 (accommodating member). The power transmission shaft 11 passes through the hub 5 and is supported on the housing 3 by a needle bearing 15 (first bearing) on one side in the axial direction, and a ball bearing 17 (second second) on the other side in the axial direction. The bearing is supported by the differential carrier 13. Note that the left and right differential carriers 13 and 13 in FIG. 1 have the same reference numerals, but may have a member configuration of two or more members having divided portions depending on the assembly form.

The housing 3 is supported on the differential carrier 13 by a double-side sealed ball bearing 19 (third bearing), and the needle bearing 15 that supports the power transmission shaft 11 on the housing 3 and the ball bearing 19 overlap in the radial direction. And
X-rings 21 and 23 (seal) which are seals having an X-shaped cross section disposed between the housing 3 and the hub 5 on the outer side in the radial direction of the support portion of the power transmission shaft 11 by the needle bearing 15 and the spline connecting portion 9. In addition, the oil space 25 is formed by 0 rings 37 and 39 which are seals having a 0-shaped cross section.

[Power system of the four-wheel drive vehicle]
This power system is, for example, the engine, transmission, transfer, front differential (differential device that distributes the driving force of the engine to the left and right front wheels), the front axle, the left and right front wheels, and the outside to transmit the driving force to the rear wheel side Other power transmission shaft (not shown) connected to the rotating member 3 (transmission shaft portion 41 in this embodiment), the power transmission device 1, the direction change gear set, and the rear differential (a differential that distributes the driving force of the engine to the left and right rear wheels) Device), a rear axle, left and right rear wheels, and the like, and the power transmission device 1 is disposed between another power transmission shaft and a direction change gear set.

  The driving force of the engine is transmitted from the transmission to the front differential, and is distributed from the front axle to the left and right front wheels, and the rotation of the front differential (difference case) is transmitted from the transfer via the other power transmission shaft on the rear wheel side to the power transmission device When the main clutch 7 of the power transmission device 1 is connected, the driving force of the engine is transmitted to the rear differential through the direction change gear set, and is distributed from the rear axle to the left and right rear wheels. It will be in a wheel drive state.

  When the connection of the main clutch 7 is released, the vehicle enters a two-wheel drive state of front wheel drive.

[Configuration of Power Transmission Device 1]
The housing 3 includes a cylindrical member 27, a cover 29, and a rotor 31 made of a magnetic material. The cover 29 and the cylindrical member 27 are fixed with bolts 33, and the rotor 31 is screwed into the rear side opening of the cylindrical member 27, and the nut 35 is retained and positioned by the lock nut function of the nut 35. And the rotor 31 are spot-welded at a plurality of locations in the circumferential direction to improve the reliability of preventing the nut from loosening. However, after the cylindrical member 27 and the rotor 31 are screwed together without using the nut 35, spot welding at a plurality of positions as described above can be performed between these members. O-rings 37 and 39 are disposed between the cylindrical member 27 and the cover 29 and between the cylindrical member 27 and the rotor 31, respectively. The housing 3 is connected to another power transmission shaft on the rear wheel side through a companion flange spline-connected to a transmission shaft portion 41 formed integrally with the cover 29 and a flange on the joint side, and is driven by the engine. Driven by force.

  The power transmission device 1 is sealed by X rings 21 and 23 and O rings 37 and 39, and oil is enclosed in the oil space 25 adjacent to the axial direction of the main clutch 7 as a clutch mechanism. This sealing means prevents oil leakage and foreign matter from entering.

  The front end of the hub 5 is supported by the housing 3 (cylindrical member 27) by a ball bearing 43, and the rear end is supported by the housing 3 (rotor 31) by a needle bearing 45. As described above, the spline connecting portion 9 is connected to the inner periphery of the hub 5, and the intermediate portion is supported by the differential carrier 13 by the ball bearing 17 on the drive path on the rear end side of the power transmission shaft 11. A part of the bevel gear is connected.

  In addition, the ball bearing 19 and the needle bearing 15 that are arranged to overlap in the radial direction are further arranged so that their axial centers coincide with each other.

  In addition to the housing 3, the hub 5 and the main clutch 7, the power transmission device 1 includes an electromagnetic magnet 47 as an actuator, a multi-plate pilot clutch 49, a cam ring 51, a ball cam 53, a pressure plate 55, It comprises an armature 57 and a controller.

  The main clutch 7 is provided between the cylindrical member 27 and the hub 5, and the pilot clutch 49 is provided between the cylindrical member 27 and the cam ring 51. The ball cam 53 is provided between the cam ring 51 and the pressure plate 55, and a bearing 59 that receives the cam reaction force of the ball cam 53 is disposed between the cam ring 51 and the rotor 31. The pressure plate 55 is splined to the outer periphery of the hub 5, and the armature 57 is splined to the inner periphery of the cylindrical member 27 between the pilot clutch 49 and the pressure plate 55.

  The core 61 of the electromagnetic magnet 47 penetrates into the recess of the rotor 31 through a predetermined air gap, and is supported by the rotor 31 by a ball bearing 63. The core 61 is connected to the differential carrier 13 by a rotation preventing member 65 and is prevented from rotating. The lead wire 67 drawn out from the core 61 is supported by a rotation preventing member 65, drawn out in a desired drawing direction, drawn out to the outside of the differential carrier 13 through a connector 69 and the like, and connected to a battery.

  The core 61, the rotor 31, the pilot clutch 49, and the armature 57 constitute a magnetic path of the electromagnetic magnet 47. The above controller performs excitation of the electromagnetic magnet 47, control of excitation current, excitation stop, and the like. When the electromagnetic magnet 47 is excited, a magnetic flux loop is formed in this magnetic path, and the pilot clutch 49 is pressed and fastened by the attracted armature 57, and the pressure plate 55 is driven by the cam thrust force of the ball cam 53 that is actuated by receiving torque. Through which the main clutch 7 is pressed and fastened, and the vehicle is in a four-wheel drive state. When the excitation of the electromagnetic magnet 47 is stopped, the connection of the main clutch 7 is released and the vehicle is in a two-wheel drive state.

[Effect of power transmission device 1]
The power transmission device 1 has the following effects.

  The power transmission shaft 11 is passed through the hub 5 and these are arranged in the radial direction so as to be greatly reduced in size in the axial direction. Therefore, the differential carrier 13 is also reduced in size, weight, and cost, and is mounted on the vehicle. Has improved.

  Further, since the power transmission shaft 11 and the hub 5 (and the housing 3) are overlapped with each other, the bearings 15, 17, and 19 that support them are concentrated in the axial direction. The support of the hub 5 and the housing 3 can be stabilized and the power transmission device 1 can be made compact.

  Further, since the power transmission shaft 11 is firmly supported by the two bearings 15 and 17 over a relatively long span, the supportability of the power transmission device 1 is stabilized.

  Further, since the needle bearing 15 supporting the power transmission shaft 11 and the ball bearing 19 supporting the housing 3 are overlapped in the radial direction, the support of the power transmission shaft 11 and the housing 3 is further strengthened. And the occurrence of abnormal noise and vibration due to poor support are prevented.

  Further, since the oil space 25 is formed between the housing 3 and the hub 5 by the X rings 21 and 23 and the 0 rings 37 and 39, the lubrication / cooling effect and durability of each housing member are improved.

  In addition, since the oil space 25 is formed on the radially outer side of the support portion (needle bearing 15) and the connection portion (spline connection portion 9) of the power transmission shaft 11, the needle bearing 15 can be arranged.

  Further, since the oil space 25 is formed adjacent to the axial direction of the main clutch 7 as the clutch mechanism, the sufficient oil space 25 can be secured without increasing the size of the power transmission device 1 on the outer diameter side.

[Other Embodiments Included within the Scope of the Present Invention]
In addition, the power transmission device of the present invention may be incorporated not only as a device for interrupting driving force as in the embodiment but also incorporated in a differential mechanism (differential device) as a differential limiting mechanism.

  In addition, the actuator, the power transmission shaft, and the like when adopting the clutch mechanism or the control clutch mechanism can take various forms with various shapes.

It is sectional drawing which shows the power transmission device 1 of an Example. It is sectional drawing of a prior art example.

Explanation of symbols

1 Power transmission device 3 Housing (outside rotating member)
5 Hub (inner rotating member)
7 Main clutch (clutch mechanism)
9 Spline connection (connection)
11 Power transmission shaft (Power transmission shaft)
13 Differential carrier (housing member)
15 Needle bearing (first bearing)
17 Ball bearing (second bearing)
19 Ball bearing (third bearing)
21,23 X ring (seal)
25 Oil space

Claims (2)

An outer rotating member that is rotatably arranged, an inner rotating member that is relatively rotatable inside the outer rotating member, a clutch mechanism that intermittently connects the outer rotating member and the inner rotating member, and an axial direction It spaced first disposed with while being supported by the receiving member side by the two bearings of a second bearing, and a power transmission shaft connected to the inner rotational member through the connecting portion, the housing In the power transmission device housed in the member ,
The power transmission shaft passes through the inner rotating member, is supported on the outer rotating member by the first bearing of the two bearings on one side in the axial direction, and the two bearings on the other side in the axial direction. is supported in the housing member by a second bearing of,
The outer rotating member is supported on the housing member by a third bearing on one side in the axial direction, and the first bearing and the third bearing that support the power transmission shaft on the outer rotating member are provided. It overlaps in the radial direction,
The power transmission device, wherein the clutch mechanism is disposed between the first bearing and the second bearing in the axial direction. The power transmission device according to claim 1,
An oil space is formed by a seal disposed between the outer rotating member and the inner rotating member, which is located radially outside the support portion of the power transmission shaft by the first bearing and the connecting portion. A power transmission device characterized by.

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