WO2013129522A1

WO2013129522A1 - Power transmission device for vehicle

Info

Publication number: WO2013129522A1
Application number: PCT/JP2013/055234
Authority: WO
Inventors: 拓洋杉本; 裕三赤坂; 達也秋元; 秀之天満; 英之岩田; 英樹藤澤
Original assignee: 日産自動車株式会社
Priority date: 2012-02-29
Filing date: 2013-02-27
Publication date: 2013-09-06
Also published as: JP2013177941A

Abstract

A clutch drum (23) has a double drum structure in which a gap (50) in the radial direction is formed between an outer cylindrical part (52) and an inner cylindrical part (51) with which a drum side friction plate (26) engages. Abrasive powder and other forms of dust are exhausted from the inside of the inner cylindrical part (51) to the gap (50) via a through-hole (54) formed through to the inner cylindrical part (51) due to the flow of air radially outward induced by the operation of a centrifugal fan. The dust exhausting performance is improved by inserting a distal end of a guiding member (55) provided so as to be capable of relative rotation with the clutch drum (23) into one end of the gap (50), and having dust in the gap (50) be guided to the outside by the guiding member (55).

Description

Vehicle power transmission device

The present invention relates to a power transmission device for a vehicle provided with a dry friction clutch, and more particularly to a dust discharge structure of the dry friction clutch.

Recently, a dry friction clutch has been adopted as a clutch for switching between connection and disconnection of an internal combustion engine and a motor in a hybrid vehicle. Such a dry friction clutch has a lower drag resistance when the clutch is released than a wet friction clutch that uses a highly viscous hydraulic oil, and therefore can reduce friction loss during motor travel when the engine is disconnected.

In such dry friction clutches, dust such as grease splashes and friction powder (facing lining) must be discharged to the outside. As such a dust discharge structure, for example, the one described in Patent Document 1 uses a pressure difference generated between the inner peripheral side and the outer peripheral side of the dry friction clutch by the action of the centrifugal fan accompanying the rotation of the dry friction clutch itself. In the dry friction clutch, an air flow is generated in the radially outward direction, and dust is discharged using the air flow.

JP 2010-242824 A

The present invention improves the dust discharge performance of the dry friction clutch when the clutch drum of the dry friction clutch has a double drum structure in which the inner cylindrical portion and the outer cylindrical portion are arranged with a predetermined gap therebetween. It is an object.

In other words, in the present invention, the clutch drum of the dry friction clutch is fixed to the inner cylindrical portion with which the drum-side friction plate is engaged with the inner cylindrical portion with a predetermined gap between the inner cylindrical portion and the inner cylindrical portion. And an outer cylindrical portion that rotates integrally. Dust such as abrasion powder generated in the dry friction clutch is passed through a through hole formed in the inner cylindrical portion of the clutch drum by a flow of air that is generated by the action of the centrifugal fan and directed radially outward. It is discharged from the inside to the gap between the inner cylindrical portion and the outer cylindrical portion.

In the present invention, the front end of a guide member provided so as to be rotatable relative to the clutch drum is inserted into the gap from one end of the gap, and the guide member allows the tip of the rotating clutch drum to pass through the gap. Dust that floats is blocked, or dust that accumulates in the vicinity of the outer peripheral surface of the inner cylindrical portion and the inner peripheral surface of the outer cylindrical portion that forms a gap is scraped out and discharged well outside the gap.

As described above, according to the present invention, by providing the guide member, the dust discharge performance in the dry friction clutch using the clutch drum having the double drum structure, in particular, in the gap between the inner cylindrical portion and the outer cylindrical portion in the clutch drum. The dust discharge performance can be improved.

BRIEF DESCRIPTION OF THE DRAWINGS The block diagram which shows simply the power transmission device of the hybrid vehicle to which the Example of this invention is applied. Sectional drawing of the part corresponded to the area | region の of FIG. 1 which shows the power transmission device which concerns on 1st Example of this invention. Sectional drawing which expands and shows the principal part of FIG. Sectional drawing which shows the clutch drum of a double drum structure alone. Explanatory drawing which shows simply the cover member attached to the housing cover. FIG. 6 is an explanatory diagram of the operation of the first embodiment, and is a diagram in which a cross section cut in the circumferential direction along the gap of the clutch drum is developed on a plane. It is action | operation explanatory drawing of 2nd Example of this invention, and is the figure which expand | deployed on the plane the cross section cut | disconnected in the circumferential direction along the clearance gap between clutch drums. Explanatory drawing which shows the vicinity of the guide member in which the brush which concerns on 3rd Example of this invention was provided in the front-end | tip.

Hereinafter, the present invention will be described with reference to illustrated embodiments. FIG. 1 schematically shows a power train of a hybrid vehicle to which the power transmission device of the present invention is applied. This vehicle is a front-wheel drive type 1-motor 2-clutch parallel hybrid vehicle, and an engine 1 and a motor generator 2 are used together as a vehicle drive source. The engine 1 is a well-known spark ignition gasoline engine or compression self-ignition diesel engine. The motor generator 2 has both a function as an electric motor that rotates by receiving electric power supplied from a battery (not shown) and a function as a generator that regenerates rotational power and fills the battery.

A damper 3 as a power transmission buffer member that absorbs vibration of the engine 1 is provided between the engine 1 and the motor generator 2, and the first is used to switch connection and disconnection of power transmission between the engine 1 and the motor generator 2. A clutch 4 is provided. The motor generator 2 is connected to a pair of drive wheels 7 via an automatic transmission 5 comprising a belt-type continuously variable transmission and a differential gear 6, and a second clutch is provided between the motor generator 2 and the automatic transmission 5. 8 is interposed. The second clutch 8 may be interposed between the automatic transmission 5 and the differential gear 6, and when the automatic transmission 5 is a stepped type, The clutch may also be used as the second clutch 8.

The first clutch 4 is interposed between a clutch input shaft 4A connected to the damper 3 and a clutch output shaft 4B connected to the motor generator 2, and switches between disconnection and connection of both. For example, in the “electric vehicle running mode” in which only the motor generator 2 is the drive source, the first clutch 4 is released and the engine 1 is disconnected, while the engine 1 and the motor generator 2 are used together as the drive source. In “travel mode”, the first clutch 4 is engaged and the engine 1 and the motor generator 2 are connected. The second clutch 8 is engaged or semi-engaged during traveling, and is released when the shift range is the N (neutral) range or the P (parking) range.

Next, a first embodiment of the present invention will be described with reference to FIGS. 2 is a cross-sectional view of a portion corresponding to the region の in FIG. The damper 3 has a substantially disk shape arranged coaxially with the clutch input shaft 4A, and a plurality of damper springs 3A for absorbing vibration are provided along the circumferential direction, and the engine 1 is connected via the damper springs 3A. Rotational power is transmitted to the clutch input shaft 4A. The clutch side plate 3B of the damper 3 is coupled to the clutch input shaft 4A, and rotates around the shaft integrally with the clutch input shaft 4A.

The motor generator 2 and the first clutch 4 are concentrically accommodated and disposed inside a clutch housing 11 made of a metal casting part provided with a predetermined gap 40 in the axial direction from the damper 3. . The clutch housing 11 is roughly constituted by a housing body 12 and a housing cover 13 which is attached to an opening of the housing body 12 on the damper 3 side and closes the opening, and is supported outside the vehicle body. The engine block 10 is fixed via a seal member 14 or the like. The clutch input shaft 4 </ b> A and the clutch output shaft 4 </ b> B are passed through and supported by the clutch housing 11 via

bearings

15 and 16. The housing cover 13 is formed with a central hole 13A through which the clutch input shaft 4A passes (see FIG. 5).

The motor generator 2 is a synchronous AC motor, and includes a rotor 18 in which a permanent magnet 17 is embedded, a stator 20 disposed on the rotor 18 with an air gap 19 therebetween, and a stator coil 21 wound around the stator 20. And have. The stator 20 is fixed to the housing body 12 described above. The rotor 18 is connected to the clutch output shaft 4B via a clutch drum 23 and a ring member 24, which will be described later, and rotates around the shaft integrally with the clutch output shaft 4B. The first clutch 4 is accommodated in the inner peripheral side of the motor generator 2, specifically, in the radial gap between the rotor 18 of the motor generator 2 and the clutch input shaft 4 </ b> A.

The first clutch 4 is a normally open, multi-plate dry friction clutch that is a main part of the present embodiment, and is hereinafter referred to as a dry clutch 4. The dry clutch 4 is fixed to the outer periphery of the clutch input shaft 4A, is provided with a clutch hub 22 that rotates integrally with the clutch input shaft 4A, and is provided coaxially and relatively rotatably on the outer periphery side of the clutch hub 22; A clutch drum 23 that is fixed to the clutch output shaft 4B via the ring member 24 and rotates integrally with the clutch output shaft 4B is provided. The rotor 18 of the motor generator 2 described above is fixed to the outer peripheral side of the clutch drum 23.

A plurality of ring-shaped hub-side friction plates 25 extending radially outward are attached to the outer peripheral side of the clutch hub 22 so as to be movable in the axial direction. Specifically, a plurality of spline grooves 22A extending in the axial direction are formed on the outer periphery of the clutch hub 22, and a plurality of spline teeth formed on the inner periphery of each hub side friction plate 25 are splined in the spline grooves 22A. By engaging, each hub-side friction plate 25 is supported in a state where it can move in the axial direction with respect to the clutch hub 22 and the movement in the circumferential direction is restricted.

A plurality of ring-shaped drum side friction plates 26 extending radially inward are attached to the inner peripheral side of the clutch drum 23 so as to be movable in the axial direction. Specifically, a spline groove 23A extending in the axial direction is formed on the inner periphery of the clutch drum 23, and spline teeth formed on the outer periphery of the drum side friction plate 26 are spline engaged with the spline groove 23A. Each drum-side friction plate 26 is supported in a state where it can move in the axial direction with respect to the clutch drum 23 and the movement in the circumferential direction is restricted.

These hub side friction plates 25 and drum side friction plates 26 are alternately arranged in the axial direction, and ring-shaped friction materials 27 as facing linings are interposed between the opposing surfaces. The hub-side friction plate 25 and the drum-side friction plate 26 are driven in the axial direction by a hydraulic actuator to be released or fastened to each other, thereby interrupting and connecting the power transmission between the clutch input shaft 4A and the clutch output shaft 4B. Can be switched. The hydraulic actuator includes a hydraulic piston 28 that is operated by hydraulic pressure supplied from a hydraulic circuit (not shown). By supplying hydraulic pressure to the hydraulic piston 28, the hydraulic piston 28 operates in the right direction in FIG. 2 against the spring force of the return spring 29, and the hub side friction plate 25 and the drum side friction are connected via the friction material 27. The plate 26 is brought into pressure contact, and the clutch is engaged. On the other hand, when the hydraulic pressure is released, the hydraulic piston 28 slides to the left in the drawing by the spring force of the return spring 29, the hub side friction plate 25 and the drum side friction plate 26 are separated, and the clutch is released.

A clutch chamber 30 in which the dry clutch 4 is accommodated, a wet chamber 31 to which hydraulic oil for hydraulic control is supplied, and a motor chamber 32 in which the motor generator 2 is accommodated are formed in the clutch housing 11. A plurality of seal members 33 to 37 are provided so that hydraulic oil, dust or the like does not enter or move between the chambers 30 to 32. In particular, the clutch chamber 30 is a sealed space partitioned from the wet chamber 31 by two

oil seals

33 and 34 and partitioned from the motor chamber 32 by a seal member 35.

The clutch drum 23 is fixed to the inner cylindrical portion 51 with which the drum-side friction plate 26 engages, and radially outward of the inner cylindrical portion with a predetermined gap 50 therebetween, and is integrated with the inner cylindrical portion 51. And a so-called double drum structure having a rotating outer cylindrical portion 52. As shown in FIG. 4, the inner cylindrical portion 51 has a plurality of spline grooves extending in the axial direction on the inner peripheral surface side thereof by forming irregularities in a step shape by pressing a relatively thin cylindrical member. 23A is formed. Each spline groove 23A has a wide structure in which two adjacent spline teeth 26A formed on the outer periphery of the drum-side friction plate 26 are fitted, and a space 26B between the two spline teeth 26A is in the axial direction. It also functions as a passage through which air flows. The outer cylindrical portion 52 is a cast part having a substantially cylindrical shape that is thicker than the inner cylindrical portion 51, and is fixed to the inner cylindrical portion 51 by welding or the like. A motor mounting surface 53 that is a cylindrical surface to which the rotor 18 is fixed is formed by a process such as grinding.

Thus, the clutch drum 23 has a double drum structure, so that the motor mounting surface 53 with high surface accuracy is formed by machining on the outer peripheral surface of the outer cylindrical portion 52 that is a cast part, while the spline groove is formed in the inner cylindrical portion 51. 23A can be easily formed by press working, and is easy to manufacture and excellent in productivity.

A plurality of through holes 54 penetrating in the radial direction are formed in the inner cylindrical portion 51, and the hub side friction plate 25 and the drum side friction plate 26 are connected to each other through the friction material 27. The vicinity of the portion facing in the direction communicates with the gap 50 between the inner cylindrical portion 51 and the outer cylindrical portion 52.

Next, the basic dust discharge structure of the dry clutch 4 will be described with reference to FIG. A housing cover 13 constituting one wall portion of the clutch housing 11 is interposed in the axial gap 40 between the damper 3 and the dry clutch 4 that rotate around the shaft, and one end of the housing cover 13 has one end. An intake hole 41 and an exhaust hole 42 communicating with the clutch chamber 30 are formed to penetrate in the axial direction. The intake hole 41 is opened in the vicinity of an engagement portion between the spline groove 22A of the clutch hub 22 and the hub side friction plate 25, that is, a portion on the inner peripheral side of the friction material 27, and the exhaust hole 42 is formed in the clutch drum. 23 is arranged coaxially with the gap 50, and one end faces the gap 50.

Due to the action of the centrifugal fan accompanying the rotation of the dry clutch 4, a pressure difference is produced in the radial direction in the clutch chamber 30, that is, the pressure inside the radial direction in which the intake holes 41 are formed is lower than the atmospheric pressure. On the other hand, the pressure outside in the radial direction in which the exhaust hole 42 is formed becomes a positive pressure higher than the atmospheric pressure, and the pressure difference in the radial direction causes the air to be taken in as shown by arrows K1 to K3 in FIG. After being introduced into the clutch chamber 30 through the hole 41 (K1) and flowing radially outward in the dry clutch 4 (K2), the inner cylindrical part 51 and the outer cylindrical part 52 are connected to each other through the through hole 54. It is discharged into the gap 50 (K3). Specifically, the air supplied into the clutch chamber 30 through the intake hole 41 is a gap in the spline engagement portion between the clutch hub 22 and the hub side friction plate 25 (for example, the space of the spline teeth shown in FIG. 6 described above). 2B, the gap between the hub-side friction plate 25 and the drum-side friction plate 26 in which the friction material 27 is interposed is indicated by an arrow along the radial direction. As shown by K2, it flows upward in FIG. 2 and is discharged to the gap 50 through the through hole 54 described above.

As described in Japanese Patent Application Laid-Open No. 2010-242824, guide grooves extending in the radial direction in the friction material 27 and the

friction plates

25 and 26 so as to promote the flow of air and dust in the dry clutch 4. In addition, a guide hole penetrating in the axial direction may be provided in the vicinity of the spline engaging portion of the

friction plates

25 and 26.

As shown in FIG. 6, the air discharged into the gap 50 is exhausted from the one end side of the gap 50 through the exhaust hole 42, and more specifically, through the guide member 55 (described later) fitted into the exhaust hole 42. (K4). Thus, when air flows through the dry clutch 4, dust D such as wear powder in the dry clutch 4 is flown out together and is discharged from the exhaust hole 42 to the outside along the air flow. . Thus, in the double drum structure, the gap 50 between the inner cylindrical portion 51 and the outer cylindrical portion 52 also functions as a passage through which air containing dust D flows.

However, since the radial dimension of the gap 50 is relatively short due to the size limitation of the clutch drum 23 and the like, dust easily collects in the gap 50, and the negative pressure and the outer circumference of the dry clutch 4 are increased. Since the pressure difference between the positive pressure in the gap 50 and the atmospheric pressure outside the clutch housing 11 is relatively small compared to the pressure difference from the positive pressure on the side, dust is not easily discharged from the gap 50. In particular, as in the present embodiment, when the outer peripheral surface of the inner cylindrical portion 51 constituting the wall surface of the gap 50 has a shape having irregularities by press working, the dust D tends to accumulate.

Therefore, in this embodiment, a guide member 55 for guiding the dust D in the gap 50 to the outside of the housing cover 13 of the clutch housing 11 is provided. The guide member 55 is integrally formed of a synthetic resin material, and extends in a radially outward direction from a tubular hollow portion 56 that passes through the exhaust hole 42 of the housing cover 13 and one end of the hollow portion. An annular mounting flange portion 57, and the mounting flange portion 57 is fixed to the peripheral edge portion of the exhaust hole 42 of the housing cover 13 using an adhesive or a fixing tool such as a bolt.

A cover member 58 is attached to the housing cover 13 so as to cover the mounting flange portion 57 of the guide member 55 so as to guide the dust D discharged from the guide member 55 to the outside of the housing cover 13 downward. Yes. As shown also in FIG. 5, a fan-shaped air passage having one end opened downward in the vertical direction is formed by the inner wall surface of the cover member 58 and the outer surface of the housing cover 13. Through, the dust discharged through the guide member 55 is discharged downward.

The hollow portion 56 of the guide member 55 is inserted through the exhaust hole 42 and extends substantially along the axial direction (rotating shaft) of the clutch drum 23, and the distal end portions thereof are the outer cylindrical portion 52 and the inner cylindrical portion 51. Is inserted into the gap 50. In the portion inserted into the gap 50, both side edges of the guide member 55 and the inner peripheral surface of the outer cylindrical portion 52 forming the gap 50 are arranged so that the guide member 55 substantially shields the gap 50 in the radial direction. The inner cylindrical portion 51 is disposed so as to face the outer peripheral surface with a slight gap.

FIG. 6 is a diagram in which a cross section cut in the circumferential direction along the gap 50 of the clutch drum 23 is developed on a plane. As shown in FIG. 6, the clutch drum 55 has an opening 59 at the tip of the guide member 55 inserted into the gap 50 so as to enter deeply into the gap 50 as it goes downstream in the rotational direction of the clutch drum 23. It inclines with respect to the orthogonal surface of 23 rotating shafts. That is, in the vicinity of the opening 59 at the tip of the guide member 55, the upstream portion of the hollow portion 56 in the direction of rotation of the clutch drum is notched and the downstream portion remains. In this way, the downstream portion extended along the longitudinal direction of the guide member 55 functions as a guide surface portion 60 that guides the dust floating in the gap 50 into the hollow portion 56. Specifically, since the clutch drum 23 rotates in the rotational direction に対して with respect to the guide member 55 attached to the housing cover 13 supported on the vehicle body side, the gap 50 of the clutch drum 23 floats. Part of the dust D such as wear powder collides with the guide surface portion 60 having a semicircular arc-shaped wall surface, is dammed up, and is sucked and guided into the hollow portion 56 opened immediately upstream thereof. Further, the dust D adhering to and accumulating on the wall surface of the gap 50 is scraped by both side edges of the guide member 55 that rotates relative to the clutch drum 23, and is sucked and guided into the hollow portion 56. As a result, the dust D in the gap 50 can be satisfactorily discharged to the outside of the clutch housing 11 through the guide member 55, and the dust discharge performance can be greatly improved.

Further, since the space outside the housing cover 13 and the gap 50 are directly communicated with each other by the tubular guide member 55, the atmospheric pressure outside the housing cover 13 is made positive through the guide member 55. The dust D is allowed to act reliably in the gap 50, and the dust D can be sucked out of the gap 50 by the pressure difference between the two, so that the dust discharge performance is improved and the gap 61 between the housing cover 13 and the clutch drum 23 (FIG. 3). The dust can be prevented from leaking out (see FIG. 6).

Moreover, since the guide member 55 is made of synthetic resin, it is in contact with the inner peripheral surface of the outer cylindrical portion 52 and the outer peripheral surface of the inner cylindrical portion 51 that form the gap 50 of the metal clutch drum 23 that rotates at high speed. However, it is relatively easy to wear away due to wear, and the rotation of the clutch drum 23 is not hindered.

In the example shown in FIGS. 2 and 3, the guide member 55 is inserted only in the vicinity of one end of the gap 50 so as to suppress an increase in ventilation resistance. The guide member 55 may be extended over almost the entire length of the center of the gap 50 or the gap 50 so as to be scraped.

In the following embodiments, only the portions different from the first embodiment will be described, and overlapping descriptions will be omitted as appropriate.

FIG. 7 shows a second embodiment of the present invention. In this second embodiment, the hollow portion 56A of the guide member 55 inserted into the gap 50 is inclined with respect to the rotational axis of the clutch drum 23 so that the tip end side thereof is inclined toward the upstream side of the clutch drum rotational direction 竈. Inclined. Accordingly, the exhaust hole 42A into which the hollow portion 56A is fitted is also inclined with respect to the rotation shaft of the clutch drum 23, similarly to the hollow portion 56A. As a result, as shown in FIG. 7, the inclination angle of the hollow portion 56A of the guide member 55 with respect to the rotational direction の of the clutch drum 23 becomes an obtuse angle, and the hollow portion 56A is inclined in a direction along the rotational direction 竈. As a result, the air flow (inertial force) in the rotational direction クラッチ of the clutch drum smoothly enters the hollow portion 56A, that is, dust such as wear powder rotating with the clutch drum 23 enters the hollow portion 56A of the guide member 55. It becomes easy to enter smoothly, and the dust discharge performance can be further improved by utilizing the inertial force due to the air flow.

FIG. 8 shows a third embodiment of the present invention. In the third embodiment, the tip of the guide member 55 inserted into the gap 50 is formed by a brush 62 having a large number of hairs extending from the tip of the hollow portion 56 along the longitudinal direction of the guide member 55. It is composed. The brush 62 is composed of a number of hairs made of synthetic resin such as nylon, animal hair, soft metal such as copper or brass, etc., and has appropriate flexibility and flexibility, and wear powder and the like. Appropriate adhesive force to hold dust, electrostatic force, van der Waals force, liquid bridging force, frictional force, etc.

When the tip of the guide member 55 inserted into the gap 50 is configured by the brush 62 as described above, air flows between the bristles of the brush 62 while the brush 62 captures dust such as abrasion powder well. Therefore, the ventilation resistance is reduced, and even when it comes into contact with the wall surface of the gap 50 of the metal clutch drum 23, it is easily worn out and worn out, so that the rotation of the clutch drum 23 is obstructed. And the increase in frictional resistance is also suppressed.

In addition, the brush 62 is inserted into the gap 50 because the brush 62 has appropriate flexibility and flexibility, and in the natural length state, the brush 62 spreads slightly toward the tip side. At this time, the tips of the bristles of the brush 62 appropriately come into contact with the wall surfaces of the gap 50 of the metal clutch drum 23 in a shape corresponding to the space shape of the gap 50. The contact portion is worn by contact with the wall surface of the clutch drum 23 that rotates at a high speed when the vehicle travels, so that the brush 62 is worn down until it finally does not contact the wall surface of the gap 50. As a result, the inner cylindrical portion 51 constituting the wall surface of the gap 50 has an uneven shape by press working as in the present embodiment, and the brush 62 is used even when the spatial shape of the gap 50 is complicated. Therefore, it is possible to reduce the dimensional tolerance at the time of designing, manufacturing and assembling. In addition, the dust 62 floating in the gap 50 can be satisfactorily captured by the brush 62 arranged in the gap 50 through a slight gap, and the dust adhered and deposited near the wall surface of the gap 50. As a result, the dust discharge performance can be greatly improved.

In this third embodiment, all the portions of the guide member 55 that are inserted into the gap 50 are constituted by the brushes 62. However, for example, as shown in FIG. 3, the guide member 55 is inserted into the gap 50 of the guide member 55. The brush 62 may be extended at the tip of the hollow portion 56.

In the above-described embodiments, the present invention is applied to the power transmission device of a front-wheel drive type hybrid vehicle. However, the present invention is not limited to this, and various types of dry friction clutches including a clutch drum having a double drum structure are provided. The present invention can also be applied to other vehicles such as rear-wheel drive hybrid vehicles, electric vehicles that do not include an engine, and vehicles that use only the engine as a drive source. Further, the dry friction clutch is not limited to the multi-plate type as in the above embodiment, but may be a single-plate type.

Claims

It is interposed between the clutch input shaft and the clutch output shaft, and has a dry friction clutch that switches between disconnection and connection of power transmission between both,
This dry friction clutch
A clutch hub that rotates with one of the clutch input shaft and the clutch output shaft;
A clutch drum provided on the outer peripheral side of the clutch hub so as to be relatively rotatable, and rotating together with the other of the clutch input shaft and the clutch output shaft;
A hub-side friction plate that extends radially outward from the clutch hub and engages the clutch hub in an axially movable manner;
Extending radially inward from the clutch drum, engaged with the clutch drum so as to be movable in the axial direction, and opposed to the hub side friction plate so as to be able to contact and separate in the axial direction. A drum side friction plate;
An actuator that switches between disconnection and connection of the power transmission by driving the hub side friction plate and the clutch side friction plate in the axial direction to open or close each other,
The clutch drum is fixed to the inner cylindrical portion with which the drum-side friction plate is engaged with the inner cylindrical portion with a predetermined gap therebetween in the radial direction, and rotates integrally with the inner cylindrical portion. And
A through-hole penetrating in the radial direction is formed in the inner cylindrical portion, and dust is discharged from the inside of the inner cylindrical portion to the gap through the through-hole,
And a guide member which is provided so as to be relatively rotatable with respect to the clutch drum, and whose tip is inserted into the gap from one axial end of the gap to guide the dust in the gap to the outside of the gap. Vehicle power transmission device.
The guide member has a tubular shape in which at least a portion not inserted into the gap has a hollow portion,
2. The guide portion according to claim 1, wherein the tip portion is provided with a guide surface portion that extends from the downstream portion of the hollow portion in the rotation direction of the clutch drum along the longitudinal direction of the guide member. Vehicle power transmission device.
3. The guide member according to claim 1, wherein the guide member is inclined with respect to a rotation axis of the clutch drum such that a tip end side inserted into the gap is inclined toward an upstream side in a rotation direction of the clutch drum. The vehicle power transmission device as described.
The vehicle power transmission device according to any one of claims 1 to 3, wherein a brush having a number of bristles extending along a longitudinal direction of the guide member is provided at a tip of the guide member.
A clutch housing supported on the vehicle body side, in which the dry friction clutch is housed and disposed;
The guide member is formed in a tubular shape having a hollow portion, and the distal end portion of the guide member is inserted into the gap while being inserted through the clutch housing, and guides dust in the gap to the outside of the clutch housing. The vehicle power transmission device according to any one of claims 1 to 4.
The vehicle is a hybrid vehicle that uses both an engine and a motor as a vehicle drive source,
The inner cylindrical portion is formed with a plurality of spline grooves with which the drum-side friction plate is engaged,
The power of the vehicle according to any one of claims 1 to 5, wherein a motor mounting surface to which a rotor of the motor rotating integrally with the outer cylindrical portion is fixed is formed on an outer peripheral surface of the outer cylindrical portion. Transmission device.