JP2010014089A - Torque-transferring device for starting engine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a torque-transferring device 1 for starting an engine capable of inhibiting lubricant used for a clutch 8 from flowing out of a mating surface of an outer fixing part 80 and a transmitting member 12. <P>SOLUTION: A clutch outer part 8b of the clutch 8 includes the outer fixing part 80 extending from an end in an axial direction to a perimeter side in a radial direction, and the outer fixing part 80 is fixed to the transmitting member 12 by tightening a bolt 14. Between the outer fixing part 80 and the transmitting member 12, a static seal member 15 (for example, paper, a rubber sheet, a metallic gasket, etc.) is provided. The static seal member 15 is arranged across entire matching surfaces of the outer fixing part 80 and the torque transmitting member 12 that are facing each other in their axial directions, and is compressed in its axial direction by tightening force of the bolt 14 so that the matching surfaces of the outer fixing part 80 and the torque transmitting member 12 are sealed. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an engine start torque transmission device in which a clutch is built in a ring gear of an engine and a starter driving torque is transmitted from the ring gear to the crankshaft of the engine via the clutch to start the engine.

In recent years, an idling stop system that automatically stops an engine when a signal stops at an intersection, for example, has been put into practical use as an exhaust gas countermeasure for automobiles, which is one of the causes of global warming. As a prior art employed in the system, for example, there is an internal combustion engine starter described in Patent Document 1.
As shown in FIG. 9, the starting device is assembled with a first rotating body 110 having a ring gear 100 provided on the outer periphery thereof, and the first rotating body 110 so as to be relatively rotatable via a bearing 120, and A second rotating body 150 (for example, a flywheel) fixed to the crankshaft 130 of the engine with a bolt 140, and a one-way clutch 160 disposed between the first rotating body 110 and the second rotating body 150. Etc., and a pinion gear (not shown) of the starter is always meshed with the ring gear 100.

When the engine is started, the drive torque of the starter is transmitted from the pinion gear to the ring gear 100, and the first rotating body 110 having the ring gear 100 rotates, so that the rotation of the first rotating body 110 is performed via the clutch 160. The engine is transmitted to the second rotating body 150 to crank the engine. Further, when the rotational speed of the second rotating body 150 exceeds the rotational speed of the first rotating body 110 due to the start of the engine, the clutch 160 idles and moves from the second rotating body 150 to the first rotating body 110. Torque transmission is interrupted.
Such a constant meshing type starting device has an effect of reducing wear and noise generated at the meshing portion of the pinion gear and the ring gear as compared with an electromagnetic pushing type starting device that pushes the pinion gear and meshes with the ring gear when the engine is started.
JP 2008-82186 A

However, in the above prior art, the outer 161 of the one-way clutch 160 has a separate structure from the second rotating body 150, and the outer 161 is fixed to the second rotating body 150 with the bolts 170. May cause problems. That is, although there is no problem in practical use, the lubricant used for the one-way clutch 160 is subjected to an extremely excessive centrifugal force when the engine is operated, so that a sufficient sealing property is provided between the second rotating body 150 and the outer 161. Is not secured, there is a concern that the lubricant may come off from the mating surface of the second rotating body 150 and the outer 161. As an expected event when the lubricant is removed, the one-way clutch 160 is not sufficiently lubricated, which may cause abnormal wear of the inner 162 and the engaging member 163 and an increase in loss torque, making it difficult to maintain performance. May be.
The present invention has been made based on the above circumstances, and an object of the present invention is to start an engine that can prevent the lubricant used in the one-way clutch from flowing out from the mating surface of the second rotating body and the outer. An object is to provide a torque transmission device.

(Invention of Claim 1)
The present invention is an engine starting torque transmission device for transmitting a driving torque generated by a starter to a crankshaft of an engine to start the engine, a first rotating body having a ring gear formed on the outer periphery, When the first rotating body rotates with the second rotating body assembled to the first rotating body through a bearing and fixed to the crankshaft, and the ring gear is driven by the starter, A one-way clutch for transmitting torque from the first rotating body to the second rotating body, the one-way clutch being provided separately from the inner configured integrally with the ring gear and the second rotating body. And a lubricant used for the one-way clutch, having an outer fixed to the second rotating body by a fixing means, and an engagement element for interrupting transmission of torque between the inner and the outer. The outer It characterized by having a lubricant outflow suppressing means for suppressing the flowing out of the mating surfaces of the second rotor.

  According to the present invention, the lubricant used for the one-way clutch can be prevented from flowing out from the mating surface between the outer and the second rotating body by the lubricant outflow inhibiting means. As a result, abnormal wear of the inner and engaging members of the clutch and an increase in loss torque can be suppressed, so that the performance of the clutch can be maintained.

(Invention of Claim 2)
The engine start torque transmitting device according to claim 1, wherein the lubricant outflow suppressing means is interposed on a mating surface between the outer and the second rotating body, and is disposed at least on the smallest diameter portion of the mating surfaces. It is characterized by being.
According to said structure, the outflow of a lubricant can be suppressed in the smallest diameter part among the mating surfaces of an outer and a 2nd rotary body. As a result, the centrifugal force acting on the lubricant due to the rotation of the crankshaft can be suppressed, and the pressing force to the lubricant outflow prevention means by the centrifugal force is reduced, thereby improving the effect of suppressing the outflow of the lubricant. In addition, when a lubricant spillage suppression means of a type that improves the sealing performance by the compressive force is used, the compression force applied to the lubricant spillage suppression means by the fixing means is reduced by reducing the pressing force to the lubricant spillage suppression means. It is possible to perform a design that suppresses this.

(Invention of Claim 3)
2. The engine starting torque transmission device according to claim 1, wherein the outer and the second rotating body have a mating surface facing each other in a radial direction, and the lubricant outflow restraining means is interposed in the radial mating surface. It is characterized by being.
According to the above configuration, since the centrifugal force acting on the lubricant by the rotation of the crankshaft is not directly applied to the lubricant outflow prevention means, compared with the case where the lubricant outflow prevention means is arranged on the axial alignment surface, The performance improvement which suppresses the outflow of a lubricant becomes possible. Or it becomes possible to suppress the sealing performance of the lubricant outflow restraining means, and the design becomes easy.

(Invention of Claim 4)
4. The engine starting torque transmission device according to claim 1, wherein the lubricant outflow suppressing means is a liquid gasket applied to a mating surface between the outer and the second rotating body. .
Liquid gaskets have the property of curing after a certain time after being applied to the mating surfaces, that is, they have fluidity when applied to the mating surfaces. There is no need to consider surface roughness and gap uniformity. As a result, the second rotating body and the outer can be easily manufactured, and the productivity can be improved. Further, as compared with the case where a sheet-like gasket (for example, a rubber sheet, a metal gasket or the like) is used, it is not necessary to secure a space for arranging the gasket, so that the apparatus can be downsized.

(Invention of Claim 5)
The torque transmission device for starting an engine according to any one of claims 1 to 4, wherein a mating surface in which the outer and the second rotating body are opposed to each other in the radial direction is referred to as a radial mating surface, and between the outer and the inner. When the space in which the engagement element is disposed is called a clutch chamber, one end of the radial alignment surface is directly connected to the clutch chamber, and the diameter of the radial alignment surface is smaller than the outer diameter of the clutch chamber, A step is provided between the outer peripheral surface of the clutch chamber and the radial alignment surface. According to the above configuration, it is difficult for the lubricant that receives the centrifugal force due to the rotation of the crankshaft to flow out of the radial alignment surface over the step provided between the outer peripheral surface of the clutch chamber and the radial alignment surface. Therefore, the performance of suppressing the outflow of the lubricant is improved.

(Invention of Claim 6)
2. The engine start torque transmitting device according to claim 1, wherein the outer and the second rotating body have a mating surface in close contact with each other in a radial direction, and the lubricant outflow suppressing means is constituted by the mating surface in close contact with the radial direction. It is characterized by being.
In this case, since the direction of the centrifugal force applied to the lubricant by the rotation of the crankshaft and the direction of the mating surface that becomes the flow path of the lubricant are perpendicular, it is possible to suppress the outflow of the lubricant due to the centrifugal force It is. Further, since the lubricant is prevented from flowing out by the mating surface in which the outer and the second rotating body are in close contact with each other in the radial direction, it is not necessary to use seal parts such as a gasket or an O-ring, and the number of parts can be reduced. Is possible. However, the sealing component is disposed on the above-described mating surface (the mating surface where the outer and the second rotating body are in close contact with each other in the radial direction) or the mating surface where the outer and the second rotating body are opposed in the axial direction. In this case, it is possible to more reliably suppress the outflow of the lubricant.

  The best mode for carrying out the present invention will be described in detail by the following examples.

FIG. 1 is a cross-sectional view of an engine starting torque transmission device (hereinafter abbreviated as torque transmission device 1) according to a first embodiment.
The torque transmission device 1 according to the present embodiment has a function of transmitting torque generated by the starter 2 (see FIG. 2) to the crankshaft 3 (see FIG. 2) of the engine. As shown in FIG. A first rotating body 5 formed with 4, a second rotating body 7 that is assembled to the first rotating body 5 via a bearing 6 and is relatively rotatable, and is fixed to the crankshaft 3; A one-way clutch 8 provided between the first rotating body 5 and the second rotating body 7, a seal member 9 for preventing the lubricant used in the clutch 8 from flowing out, and the like.

As shown in FIG. 2, the first rotating body 5 is such that the pinion gear 10 of the starter 2 is always meshed with the ring gear 4, and the ring gear 4 is driven by the starter 2 to rotate.
The second rotating body 7 includes, for example, a flywheel 11 for MT vehicles (or a drive plate for AT vehicles) and a transmission member 12 provided separately from the flywheel 11. As shown in FIG. 1, the flywheel 11 and the transmission member 12 are provided with boss portions 11a and 12a at the innermost diameter portions of the flywheel 11 and the bolts 13 in the through holes 11b and 12b formed in the boss portions 11a and 12a, respectively. (See FIG. 2), the bolt 13 is fastened to the end of the crankshaft 3 and fixed.
As shown in FIG. 1, the bearing 6 is a ball bearing in which a plurality of balls are movably disposed between an outer ring and an inner ring, and seal plates 6a for maintaining sealing performance are provided on both sides of the balls. It is attached. The bearing 6 is incorporated between a boss portion 12 a provided on the transmission member 12 and a cylindrical wall portion 5 a provided on the innermost diameter portion of the first rotating body 5.

The clutch 8 includes an inner 8a that rotates integrally with the first rotating body 5, an outer 8b that rotates integrally with the second rotating body 7, an engagement member 8c disposed between the inner 8a and the outer 8b, and the like. A lubricant (for example, grease, engine oil, etc.) is enclosed inside.
The inner 8a is fitted to the outer periphery of the cylindrical wall portion 5a of the first rotating body 5, and is fixed to the cylindrical wall portion 5a by means such as caulking, for example.
The outer 8b has an outer fixing portion 80 extending from the one end side in the axial direction (the right end side in FIG. 1) to the outer peripheral side in the radial direction, and the outer fixing portion 80 tightens the bolt 14 to the transmission member 12. It is fixed.

Between the outer fixing part 80 and the transmission member 12, a static seal member 15 which is an example of the lubricant outflow restraining means of the present invention is sandwiched. The static seal is a general term for seals used for sealing a stationary surface that does not involve relative movement. As a specific example of the static seal member 15, a sheet member such as paper, a rubber sheet, or a metal gasket can be used. . In the static seal member 15, the outer fixing portion 80 and the transmission member 12 are disposed on the entire mating surface facing in the axial direction (left-right direction in FIG. 1), and are compressed in the axial direction by the tightening force of the bolts 14. Thus, the mating surface between the outer fixing portion 80 and the transmission member 12 is sealed.
The engagement element 8c is, for example, a roller, a sprag, a cam or the like, and has a function of intermittently transmitting torque between the inner 8a and the outer 8b. Specifically, torque transmission from the inner 8a to the outer 8b is allowed, and torque transmission from the outer 8b to the inner 8a is interrupted.

The seal member 9 is, for example, a well-known oil seal, and is press-fitted and assembled to the inner periphery of the axial protrusion 5b provided on the first rotating body 5, and the rubber lip 9a is attached to the outer 8b. It is in contact with the outer peripheral surface. The seal member 9 seals the outer peripheral side of the clutch 8 by the lip portion 9a slidingly contacting the outer peripheral surface of the outer 8b when relative rotation between the first rotating body 5 and the second rotating body 7 occurs. To prevent the lubricant from flowing out.
The inner peripheral side of the clutch 8 is sealed by the bearing 6 (ball bearing having a sealing function), and the mating surface of the outer fixing portion 80 and the transmission member 12 is statically sandwiched between the two. Sealed by a seal member 15.

Next, the operation of the torque transmission device 1 will be described.
a) When starting the engine When the ring gear 4 is driven by the starter 2 and the first rotating body 5 rotates, the clutch 8 is engaged (the inner 8a and the outer 8b are connected via the engaging element 8c). Then, torque is transmitted in the order of the first rotating body 5 → clutch 8 → second rotating body 7 → crankshaft 3 to start cranking.
b) After engine start The engine is completely exploded from cranking, and the rotation of the crankshaft 3 is transmitted to the second rotating body 7, and the rotating speed of the second rotating body 7 is the rotating speed of the first rotating body 5. Is exceeded, the clutch 8 is idling and torque transmission from the second rotating body 7 to the first rotating body 5 is interrupted. Thereby, the rotation of the engine is not input to the starter 2.

(Effect of Example 1)
In the torque transmission device 1 according to the present embodiment, the static seal member 15 is sandwiched between the outer fixing portion 80 and the transmission member 12, and the static seal member 15 is compressed by tightening the bolts 14. And the transmission member 12 can be sealed without a gap. Thereby, since it is possible to prevent the lubricant from flowing out from the mating surface between the outer fixing portion 80 and the transmission member 12, it is possible to suppress abnormal wear of the outer 8b, the inner 8a, and the engaging element 8c when the clutch 8 is idling. In addition, an increase in loss torque can be suppressed, and the performance of the clutch 8 can be maintained.

  Further, since the static seal member 15 is disposed on the entire mating surface where the outer fixing portion 80 and the transmission member 12 face each other in the axial direction, the static sealing member 15 is the most of the mating surfaces of the outer fixing portion 80 and the transmission member 12. The outflow of lubricant can be suppressed at the small diameter part. As a result, the centrifugal force acting on the lubricant by the rotation of the crankshaft 3 can be suppressed, and the pressing force to the static seal member 15 due to the centrifugal force is reduced, thereby improving the effect of suppressing the outflow of the lubricant. . Further, by using the static seal member 15 of a type in which the sealing performance is improved by the compressive force, the pressing force to the static seal member 15 by the centrifugal force is reduced, so that the bolt 14 applies the static seal member 15 to the static seal member 15. It is possible to perform a design with reduced compression force.

FIG. 3 is a cross-sectional view of the torque transmission device 1 according to the second embodiment.
The second embodiment is an example in which an O-ring 16 (or a square ring) may be used as the lubricant outflow restraining means of the present invention as shown in FIG.
The O-ring 16 is formed on, for example, the axial end surface (the contact surface with the transmission member 12) of the outer fixing portion 80 or the axial end surface (the contact surface with the outer fixing portion 80) of the transmission member 12. The O-ring 16 is compressed in the axial direction by fastening and fixing the outer fixing portion 80 and the transmission member 12 with the bolt 14 in the ring groove 17, and the mating surface between the outer fixing portion 80 and the transmission member 12. Can be sealed without gaps. Accordingly, it is possible to prevent the lubricant from flowing out from the mating surface between the outer fixing portion 80 and the transmission member 12.

  Needless to say, the O-ring 16 is disposed on the inner diameter side of the mating surface of the outer fixing portion 80 and the transmission member 12 with respect to the portion fastened by the bolt 14. In other words, if it is on the inner diameter side from the portion fastened by the bolt 14, for example, as shown in FIG. 4, the ring groove 17 is formed on the mating surface where the outer fixing portion 80 and the transmission member 12 face each other in the radial direction. The O-ring 16 can also be arranged.

FIG. 5 is a cross-sectional view of the torque transmission device 1 according to the third embodiment.
The third embodiment is an example in which the liquid gasket 18 is used as the lubricant outflow inhibiting means of the present invention.
For example, the liquid gasket 18 is applied to the entire mating surface between the outer fixing portion 80 and the transmission member 12 that face each other in the axial direction. Moreover, the outer fixing | fixed part 80 and the transmission member 12 are being fixed by the crimping means 19 (an example of the fixing means of this invention), as shown in FIG.
The liquid gasket 18 has a characteristic of being cured after a predetermined time since it is applied to the entire mating surface of the outer fixing portion 80 and the transmission member 12. Accordingly, the outer fixing portion 80 and the transmission member 12 are assembled and fixed by the caulking means 19 after the liquid gasket 18 is applied to the mating surfaces of the outer fixing portion 80 and the transmitting member 12 before the liquid gasket 18 is cured.

  Since the liquid gasket 18 of this embodiment has high fluidity when applied to the mating surface of the outer fixing portion 80 and the transmission member 12 (before curing), the surface roughness of the mating surface required for designing the sealing material is high. There is no need to consider the uniformity of the sheath. As a result, the outer fixing portion 80 and the transmission member 12 can be easily manufactured, and productivity can be improved. Further, as compared with the case where a sheet-like gasket (for example, a rubber sheet, a metal gasket, or the like) is used, it is not necessary to secure a space for arranging the sheet-like gasket between the outer fixing portion 80 and the transmission member 12. Therefore, the apparatus can be downsized. Further, as compared with the case where the O-ring 16 described in the second embodiment is used, it is not necessary to form the ring groove 17 for disposing the O-ring 16, so that the structure can be simplified.

In addition to the caulking means 19 shown in FIG. 5, for example, as shown in FIG. 6, the outer diameter of the transmission member 12 is extended from the outer diameter of the outer fixing portion 80, and the outer portion is fixed by the extended portion 12c. The outer diameter portion of the portion 80 can be wrapped and fixed by caulking. In this case, since the path through which the lubricant can flow out can be long and formed in a labyrinth shape, the outflow of the lubricant can be further suppressed.
Even when the liquid gasket 18 is used, it is not limited to the above caulking and may be fixed by tightening the bolts 14 as shown in the first and second embodiments.

FIG. 7 is a cross-sectional view of the torque transmission device 1 according to the fourth embodiment.
As shown in FIG. 7, the fourth embodiment is an example in which the lubricant outflow restraining means of the present invention is configured by the mating surface 20 in which the outer fixing portion 80 and the transmission member 12 are in close contact with each other in the radial direction.
The mating surface 20 in which the outer fixing portion 80 and the transmission member 12 are in close contact with each other in the radial direction, that is, the inner peripheral surface of the outer fixing portion 80 and the outer peripheral surface of the transmission member 12 that are opposed to each other in the radial direction are mirror-finished, for example. By sticking in the radial direction, a sealing function can be provided.
According to the above configuration, the direction of the centrifugal force applied to the lubricant by the rotation of the crankshaft 3 (upward direction in the drawing) and the direction of the mating surface 20 in which the outer fixing portion 80 and the transmission member 12 are in close contact with each other in the radial direction (shown in the drawing). Therefore, it is possible to suppress the outflow of the lubricant due to the centrifugal force.

  Further, by suppressing the outflow of the lubricant by the mating surface 20 in which the outer fixing portion 80 and the transmission member 12 are in close contact with each other in the radial direction, for example, there is no need to use seal parts such as gaskets and O-rings. Can be reduced. However, the sealing performance can be further improved by forming a ring groove on the mating surface 20 and disposing an O-ring in the ring groove. Alternatively, the outer fixing portion 80 and the transmission member 12 face each other in the axial direction together with the configuration of the present embodiment (the configuration in which the mating surface 20 where the outer fixing portion 80 and the transmission member 12 are in close contact with each other in the radial direction has a sealing function). It is also possible to arrange sealing means (for example, a sheet-like gasket, a liquid gasket, an O-ring, etc.) on the mating surface 21, and as a result, the outflow of the lubricant can be suppressed more reliably.

FIG. 8 is a cross-sectional view of the torque transmission device 1 according to the fifth embodiment.
As shown in FIG. 8, the fifth embodiment is an example that suppresses the outflow of the lubricant by providing a step 22 on the inner peripheral surface of the outer 8 b.
When a space in which the engaging element 8c is disposed between the outer 8b and the inner 8a is referred to as a clutch chamber 23, the outer fixing portion 80 and the transmission member 12 are opposed to each other in the radial direction (the radial direction matching surface 24). One end) is directly connected to the clutch chamber 23, and the diameter of the radial alignment surface 24 is smaller than the outer diameter of the clutch chamber 23, so that the outer peripheral surface of the clutch chamber 23 and the radial alignment surface 24 A step 22 is provided between them.

According to the above configuration, the lubricant that receives the centrifugal force due to the rotation of the crankshaft 3 overcomes the step 22 provided between the outer peripheral surface of the clutch chamber 23 and the radial alignment surface 24, and from the radial alignment surface 24. Since it is difficult to flow out, lubricant outflow can be suppressed.
In addition, although a present Example can also use said structure (structure which suppresses the outflow of a lubricant with level | step difference 22) independently, by using together with any structure described in Examples 1-4, Lubricant outflow can be prevented more reliably.

(Modification)
In the torque transmission device 1 described in the first embodiment, the pinion gear 10 of the starter 2 is always meshed with the ring gear 4 provided in the first rotating body 5, but the pinion gear 10 is pushed out in the axial direction only when the engine is started. It can also be applied to an electromagnetic push-in type starter that meshes with the.

1 is a cross-sectional view of a torque transmission device according to a first embodiment. It is a general view of an engine starting device. FIG. 6 is a cross-sectional view of a torque transmission device according to a second embodiment. FIG. 6 is a cross-sectional view of a torque transmission device according to a second embodiment. FIG. 6 is a cross-sectional view of a torque transmission device according to a third embodiment. FIG. 6 is a cross-sectional view of a torque transmission device according to a third embodiment. FIG. 6 is a cross-sectional view of a torque transmission device according to a fourth embodiment. FIG. 9 is a cross-sectional view of a torque transmission device according to a fifth embodiment. It is sectional drawing of the torque transmission apparatus which concerns on a prior art.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Engine start torque transmission device 2 Starter 3 Crankshaft 4 Ring gear 5 First rotary body 6 Bearing 7 Second rotary body 8 One-way clutch 8a Inner 8b Outer 8c Engagement element 14 Bolt (fixing means)
15 Static seal member (Lubricant outflow suppression means)
16 O-ring (Lubricant outflow suppression means)
18 Liquid gasket (Lubricant outflow prevention means)
19 Caulking means (fixing means)
20 A mating surface where the outer fixing portion and the transmission member are in close contact with each other in the radial direction (lubricant outflow prevention means)
22 Step 23 Clutch chamber 24 Radial alignment surface of outer fixing part and transmission member

Claims (6)

An engine start torque transmission device for transmitting a drive torque generated by a starter to an engine crankshaft to start the engine,
A first rotating body having a ring gear formed on the outer periphery;
A second rotating body assembled to the first rotating body via a bearing so as to be relatively rotatable, and fixed to the crankshaft;
A one-way clutch that transmits torque from the first rotating body to the second rotating body when the ring gear is driven by the starter and the first rotating body rotates;
The one-way clutch includes an inner configured integrally with the ring gear, an outer provided separately from the second rotating body and fixed to the second rotating body by a fixing unit, and the inner And an engagement member for interrupting transmission of torque between the outer member and the outer member,
Engine starting torque, characterized by comprising lubricant outflow inhibiting means for inhibiting the lubricant used in the one-way clutch from flowing out from the mating surface of the outer and the second rotating body. Transmission device. The torque transmission device for starting an engine according to claim 1,
The lubricant flow suppression means is interposed in a mating surface of the outer and the second rotating body, and is disposed at least at a smallest diameter portion of the mating surface. apparatus. The torque transmission device for starting an engine according to claim 1,
The outer and the second rotating body have a mating surface opposed in the radial direction;
The engine starting torque transmitting device, wherein the lubricant outflow inhibiting means is interposed on the radial mating surface. The torque transmission device for starting an engine according to any one of claims 1 to 3,
The engine starting torque transmission device, wherein the lubricant outflow suppression means is a liquid gasket applied to a mating surface of the outer and the second rotating body. The torque transmission device for starting an engine according to any one of claims 1 to 4,
A mating surface in which the outer and the second rotating body face each other in the radial direction is referred to as a radial mating surface, and a space in which the engagement element is disposed between the outer and the inner is referred to as a clutch chamber. One end of the radial alignment surface communicates directly with the clutch chamber, and the diameter of the radial alignment surface is smaller than the outer diameter of the clutch chamber, and the outer circumferential surface of the clutch chamber and the radial direction A torque transmission device for starting an engine, characterized in that a step is provided between the mating surfaces. The torque transmission device for starting an engine according to claim 1,
The engine starting torque characterized in that the outer and the second rotating body have a mating surface in close contact with each other in the radial direction, and the lubricant outflow suppressing means is constituted by the mating surface in close contact with the radial direction. Transmission device.

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