JP2008121660A - Engine starting torque transmission device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sealing structure without sliding loss that can be inexpensively manufactured. <P>SOLUTION: A first rotating body 3 has a plate wall part 3c extended in the radial direction having a predetermined gap between an axial end face of an outer part 13 of a clutch 7 and itself, and a protruding wall 3d approaching the outer diameter of the outer part 13 on the outside in the radial direction of the outer part 13 from the plate wall part 3c and protruding in the axial direction. The outer peripheral face of the outer part 13 is provided in a tapered shape, in which the outer diameter becomes gradually smaller as it separates from the plate wall part 3c in the axial direction. Thereby, when water is splashed from the outside during rotation of the engine, the water hardly intrudes due to the protruding wall 3d. Further, even when water intrudes by going over the protruding wall 3d, because the outer part 13 of the clutch 7 is rotating at high speed, the water splashed on the outer part 13 can be flown to the outside by centrifugal force. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an engine starting torque transmission device incorporating a one-way clutch.

As a prior art, there is a starter device disclosed in Patent Document 1.
In this starter device, the pinion gear of the starter is always meshed with the ring gear on the engine side, and a one-way clutch is built in between the ring gear and the crankshaft of the engine. When the engine is started, the clutch is engaged, and the driving torque transmitted from the starter is transmitted to the crankshaft. On the other hand, after the engine is started, the clutch is disengaged and idles to prevent the rotation of the engine from being transmitted to the starter.
By the way, the clutch used in the starter device is filled with a lubricant such as grease, so that this lubricant is prevented from leaking to the outside or water or mud from entering the inside of the clutch from the outside. There is a need to. As a countermeasure against this, a structure in which sealing is performed by an oil seal or a bearing with a seal is generally known.

Here, an example of a torque transmission device using an oil seal is shown in FIG.
This torque transmission device is supported on a flywheel 110 fixed to the crankshaft 100 of the engine, and is supported on the flywheel 110 via a bearing 120 (bearing with a seal) so as to be relatively rotatable, and a starter pinion gear (not shown). 2), a clutch 140 that intermittently transmits torque between the ring gear 130 and the flywheel 110, an oil seal 150 that seals the outer side (upper side in the drawing) of the clutch 140, and the like. Is done. The clutch 140 is fixed to the inner periphery in the radial direction of the ring gear 130, and an inner portion 140a that rotates integrally with the ring gear 130, and an outer portion 140b that is fixed to the flywheel 110 by a bolt 160 and rotates integrally with the flywheel 110. And an engaging member 140c (sprag, cam, roller, etc.) disposed between the inner portion 140a and the outer portion 140b.

The oil seal 150 is configured, for example, by baking a synthetic rubber 152 on a metal ring 151, and a spring 154 is incorporated on the outer periphery of a seal portion 153 formed by the synthetic rubber 152. The oil seal 150 is press-fitted into the inner periphery of the protruding wall 131 provided on the ring gear 130, and is non-rotatably assembled to the ring gear 130, and the seal portion 153 pressed against the spring 154 has an outer periphery of the outer portion 140b. Pressed against the surface to prevent lubricant leakage. Further, the oil seal 150 is integrally provided with a dust 155, and the dust 155 prevents entry of dust or water from the outside. As a substitute for the oil seal 150, a bearing with a seal can be used in the same manner as the bearing 120 described above.
JP-A-10-122107

However, in the seal structure using the oil seal 150 or the bearing with the seal, the unit cost of manufacturing the oil seal 150 and the bearing with the seal is high, which increases the cost. Further, since the peripheral speed of the seal portion 153 is very high, there is a problem that an increase in sliding loss and a decrease in durability are caused. Furthermore, when using low-viscosity oil as the lubricant for the clutch 140, it is necessary to improve the sealing force of the oil seal 150 (up tightening allowance) more than when grease (having higher viscosity than oil) is used as the lubricant. Therefore, sliding loss due to the oil seal 150 is further increased. In particular, the sliding loss becomes an engine load during engine rotation, which causes a deterioration in fuel consumption.
The present invention has been made based on the above circumstances, and the object thereof is to achieve prevention of leakage of lubricant filled in the clutch and prevention of water ingress into the clutch at low cost and without any sliding loss. Another object of the present invention is to provide a torque transmission device for starting an engine.

(Invention of Claim 1)
In the present invention, a gear portion is provided on the outer periphery in the radial direction, and the gear portion is fixed to the crankshaft of the engine and the first rotation body that is always meshed with the pinion gear of the starter, and the first rotation is performed via a bearing. A second rotating body assembled to be rotatable relative to the body, an inner portion provided in the first rotating body, and a clutch for intermittently transmitting torque between an outer portion provided in the second rotating body. And when the first rotating body rotates by being driven by the starter, the clutch is connected to transmit torque from the first rotating body to the second rotating body, and the second rotating body is driven by the engine. An engine starting torque transmission device that disengages the clutch from the second rotating body and interrupts torque transmission from the second rotating body when the first rotating body rotates in the axial direction of the outer portion. There is a predetermined gap between the end face A projecting wall is provided that has a plate wall disposed in the radial direction and protrudes in the axial direction on the radially outer side of the outer portion from the plate wall in proximity to the outer diameter of the outer portion. A taper shape in which the outer diameter gradually decreases as the distance from the plate wall in the axial direction is increased.

According to the above configuration, when water is applied from the outside during engine rotation, the intrusion of water to the clutch side is suppressed by the protruding wall protruding in the axial direction from the plate wall of the first rotating body. Moreover, even when it gets over the protruding wall and is submerged, the outer part of the clutch rotates at high speed, so that the water applied to the outer part can be blown outward by centrifugal force. Invasion of moisture can be suppressed by the effect of so-called slinger (or flinger).
In particular, since the outer peripheral surface of the outer portion is provided in a tapered shape in which the outer diameter gradually decreases as it moves away from the plate wall in the axial direction, the outer peripheral surface of the outer portion is reversely tapered (the outer diameter of the outer portion is increased). It is possible to effectively prevent water from entering the direction). Accordingly, it is possible to prevent water from entering into the clutch through a gap formed between the plate wall and the axial end surface of the outer portion.

Further, since the protruding wall that protrudes in the axial direction from the plate wall is provided close to the outer diameter of the outer portion, the lubricant (for example, grease) filled in the clutch is allowed to flow between the plate wall and the outer portion. It is possible to suppress leakage to the outside through a gap formed therebetween.
As described above, the torque transmission device for engine start according to the present invention does not have a structure in which, for example, a lip portion such as an oil seal is pressed against the outer peripheral surface of the outer portion for sealing, and therefore a sliding loss due to the seal is not generated. In addition, the engine load during engine rotation can be reduced, which can contribute to improvement in fuel consumption. In addition, since it is not necessary to use expensive seal parts (such as an oil seal or a bearing with a seal), an inexpensive seal structure can be provided.

(Invention of Claim 2)
In the present invention, a gear portion is provided on the outer periphery in the radial direction, and the gear portion is fixed to the crankshaft of the engine and the first rotation body that is always meshed with the pinion gear of the starter, and the first rotation is performed via a bearing. A second rotating body assembled to be rotatable relative to the body, an inner portion provided in the first rotating body, and a clutch for intermittently transmitting torque between an outer portion provided in the second rotating body. And when the first rotating body rotates by being driven by the starter, the clutch is connected to transmit torque from the first rotating body to the second rotating body, and the second rotating body is driven by the engine. An engine starting torque transmission device that disengages the clutch from the second rotating body and interrupts torque transmission from the second rotating body when the first rotating body rotates in the axial direction of the outer portion. There is a predetermined gap between the end face A first projecting wall is provided that has a plate wall disposed in the radial direction and projects from the plate wall in the axial direction on the radially outer side of the outer portion in proximity to the outer diameter of the outer portion. The body is provided with a second projecting wall that projects radially outward of the first projecting wall in the axial direction toward the plate wall side, and the first projecting wall is provided between the second projecting wall and the outer portion. Is inserted with a predetermined gap.

  According to the above configuration, since the second rotating body fixed to the crankshaft of the engine rotates at a high speed when it gets wet from the outside while the engine is rotating, the second rotating body is provided on the second rotating body. Further, the water applied to the second protruding wall can be blown outward by centrifugal force. Invasion of moisture can be suppressed by the effect of so-called slinger (or flinger). In addition, since the first protruding wall enters between the second protruding wall and the outer part of the clutch, and a U-shaped gap is formed around the first protruding wall, water enters. It has a difficult labyrinth structure. Even if the water is flooded beyond the second projecting wall, the water applied to the outer part of the clutch can be blown outward by centrifugal force, so that it is formed between the plate wall and the axial end surface of the outer part. Water can be prevented from entering the clutch through the gap.

Further, since the first projecting wall enters between the second projecting wall and the outer part of the clutch to form a so-called labyrinth structure, a lubricant (for example, grease) filled in the clutch is externally applied. There is also an effect that can suppress leakage.
As described above, the torque transmission device for engine start according to the present invention does not have a structure in which, for example, a lip portion such as an oil seal is pressed against the outer peripheral surface of the outer portion for sealing, and therefore a sliding loss due to the seal is not generated. In addition, the engine load during engine rotation can be reduced, which can contribute to improvement in fuel consumption. In addition, since it is not necessary to use expensive seal parts (such as an oil seal or a bearing with a seal), an inexpensive seal structure can be provided.

(Invention of Claim 3)
3. The engine starting torque transmission device according to claim 2, wherein the first rotating body is provided with a third projecting wall that projects axially outward from the plate wall in the radial direction of the second projecting wall. The second projecting wall is inserted with a predetermined gap between the projecting wall and the first projecting wall.
According to the above configuration, the first projecting wall is inserted between the outer portion of the clutch and the second projecting wall, and the second projecting wall is interposed between the first projecting wall and the third projecting wall. Since a labyrinth groove is formed between the first rotating body and the second rotating body, it is possible to prevent water from entering the clutch and leakage of the lubricant filled in the clutch. Becomes larger.

(Invention of Claim 4)
The engine start torque transmitting device according to any one of claims 1 to 3, wherein a thrust washer is sandwiched in a gap formed between the plate wall and the axial end surface of the outer portion.
In this case, since the sealing effect by the thrust washer can be expected, it is possible to enhance the effect of preventing water from entering the clutch and preventing leakage of the lubricant in the clutch, and a more reliable seal structure can be provided.

(Invention of Claim 5)
According to the present invention, a gear portion is provided on the outer periphery in the radial direction, and the gear portion is fixed to the crankshaft of the engine and the first rotation body that is always meshed with the pinion gear of the starter, and the first rotation is performed via the bearing. A second rotating body assembled to be rotatable relative to the body, an inner part provided in the first rotating body, and a clutch for intermittently transmitting torque between an outer part provided in the second rotating body; And a sealing means capable of preventing the lubricant filled in the clutch from flowing out. When the first rotating body is driven to rotate by the starter, the clutch is connected to the second rotating body from the first rotating body. Torque is transmitted to the rotator, and when the second rotator is driven by the engine to rotate, the clutch is disengaged to cut off torque transmission from the second rotator to the first rotator. With transmission device Thus, the sealing means seals the gap generated between the first rotating body and the outer portion, and the second seal sealing the gap generated between the second rotating body and the inner portion. The at least one sealing means is a labyrinth seal that forms a labyrinth-shaped labyrinth groove.

  Since the labyrinth seal of the present invention forms a labyrinth-shaped labyrinth groove, it is difficult for water to pass through the labyrinth groove even if there is water from the outside during engine rotation. Inundation can be suppressed. On the other hand, it is difficult for the lubricant filled in the clutch to flow out through the labyrinth groove, and leakage of the lubricant can be prevented. Further, the labyrinth seal of the present invention does not have a structure in which, for example, a lip portion such as an oil seal is pressed against the outer peripheral surface of the outer portion to seal, so that a sliding loss due to the seal does not occur and the engine is rotating. The load can be reduced and it can contribute to the improvement of fuel consumption deterioration. In addition, since it is not necessary to use expensive seal parts (such as an oil seal or a bearing with a seal), an inexpensive seal structure can be provided.

(Invention of Claim 6)
6. The engine start torque transmitting device according to claim 5, wherein the labyrinth seal has an inner opening, which is one of the openings at the both ends of the labyrinth groove (inlet and outlet) that opens closest to the clutch. It is characterized in that it is formed radially inside from the outer peripheral surface of the part.
In this case, since the inlet of the labyrinth groove is located radially inward from the outer peripheral surface of the inner portion, even if the lubricant near the inner is blown to the outer peripheral side due to centrifugal force during engine rotation, Lubricant does not enter the inlet, and lubricant leakage can be effectively prevented.

(Invention of Claim 7)
7. The engine start torque transmitting device according to claim 6, wherein the labyrinth seal has an outermost diameter portion of the labyrinth groove extending radially outward from an inlet of the labyrinth groove on a radially outer side from an inner peripheral surface of the outer portion. It is formed.
In this configuration, the distance from the inlet of the labyrinth groove to the outermost diameter portion (the length in the radial direction) is the dimension between the outer peripheral surface of the inner portion of the clutch and the inner peripheral surface of the outer portion (distance in the radial direction). Can be bigger. That is, since the length of the labyrinth groove can be made longer, the effect of preventing the lubricant from leaking can be enhanced.

(Invention of Claim 8)
The torque transmission device for starting an engine according to any one of claims 5 to 7, wherein the labyrinth seal includes one or more first plate members fixed to the first rotating body or the inner portion, and the second rotation. One or more second plate members fixed to the body or the outer part are arranged in a non-contact manner, and a labyrinth groove is formed between the two plate members.
According to said structure, since a 1st plate member and a 2nd plate member can be processed into a desired shape by press, for example, a labyrinth-like labyrinth groove can be formed easily and inexpensively.

(Invention of Claim 9)
9. The engine start torque transmitting device according to claim 8, wherein the labyrinth seal is formed such that an outlet which is the other opening of the labyrinth groove extends in the axial direction toward the opposite clutch side, and the inside of the outlet of the labyrinth groove is The peripheral wall is formed by the first plate member, and the outer peripheral wall of the outlet of the labyrinth groove is formed by the second plate member.
According to said structure, since the exit of a labyrinth groove | channel is formed extending in the axial direction, it arises by rotation of the 2nd plate member fixed to the 2nd rotary body or the outer part during engine rotation. By the centrifugal force, it is possible to blow away moisture that tries to enter the inside of the labyrinth groove from the outside. That is, since the second plate member forms the outer peripheral wall of the outlet of the labyrinth groove, the second plate member rotates during engine rotation to generate centrifugal force, thereby preventing moisture from entering due to the slinger effect. Can be suppressed.

(Invention of Claim 10)
The torque transmission device for engine starting according to any one of claims 7 to 9, wherein the first plate member extends radially outward from a root side fixed to the first rotating body or the inner portion, and The distal end portion is formed in a substantially L shape that is bent in the axial direction, and the second plate member covers the periphery of the first plate member, so that a labyrinth groove is formed along the periphery of the first plate member. It is characterized by.
In this case, since a portion that is bent in an L shape is formed in the labyrinth groove, a more complicated labyrinth groove can be formed, and a labyrinth seal with higher sealing performance can be provided.

(Invention of Claim 11)
The torque transmission device for engine start according to claim 10, wherein the second plate member covering the periphery of the first plate member with a predetermined gap is provided at one end side in the plate thickness direction of the first plate member. A second plate member A arranged with a predetermined gap and a second plate member B arranged with a predetermined gap on the other end side in the plate thickness direction of the first plate member. It is formed by combining.
In this case, the second plate member is not formed as a single piece, but the labyrinth groove having a complicated shape can be easily formed by combining the second plate member A and the second plate member B. it can.

(Invention of Claim 12)
The torque transmission device for engine starting according to any one of claims 5 to 11, wherein a rotating plate fixed to the second rotating body or the outer portion is provided on the side opposite to the clutch of the labyrinth seal. The slinger (or flinger) is configured to prevent the entry of foreign matter from the outside by the action of centrifugal force generated by rotating integrally with the second rotating body and the outer part.
According to the above configuration, foreign substances such as dust and dirt can be prevented from entering from the outside by the action of the centrifugal force (slinger effect) generated during the rotation of the engine, that is, by the rotation of the rotating plate. Can be prevented from being deposited.

(Invention of Claim 13)
The engine starting torque transmission device according to claim 12, wherein the first rotating body is attached with a dust-proof plate that is close to the rotating plate in a non-contact manner and is disposed so as to wrap in the axial direction. It is characterized by.
In this case, the action of the centrifugal force generated by the rotation of the rotating plate, that is, the slinger effect can be further enhanced, and entry of foreign matter such as dust and dirt from the outside can be prevented.

(Invention of Claim 14)
In any one of the torque transmission devices for starting an engine according to claims 5 to 12, a dust seal attached to the first rotating body is provided on the side opposite to the clutch of the labyrinth seal, and the lip portion of the dust seal is connected to the outer portion. It is characterized by being brought into sliding contact with the outer peripheral surface.
Thereby, intrusion of foreign matters such as dust and dirt from the outside can be suppressed, and foreign matter can be prevented from accumulating around the labyrinth seal.

(Invention of Claim 15)
The torque transmission device for starting an engine according to any one of claims 1 to 14, wherein a lubricant having a viscosity higher than that of the lubricant filled in the clutch is sealed in at least a part of the labyrinth groove.
Thereby, it is possible to further improve the sealing performance, that is, to prevent the leakage of the lubricant from the clutch and to prevent the entry of foreign matter (moisture, dust, dust, etc.) from the outside.

(Invention of Claim 16)
The torque transmission device for starting an engine according to any one of claims 1 to 15, wherein grease is used as a lubricant filled in the clutch.
If grease with a relatively high viscosity is used as a lubricant for the clutch, it will not flow out to the outside as easily as oil, so a seal structure that does not use seal parts as in the present invention (a seal that does not cause sliding loss) Suitable for structure).

(Invention of Claim 17)
The engine start torque transmission device according to any one of claims 1 to 16, wherein the engine start torque transmission device is used in an engine automatic stop / restart system that automatically controls stop and restart of the engine.
In the engine automatic stop / restart system, the number of engine starts is significantly increased as compared with a vehicle not equipped with the system, so that the reduction of the start time and the noise reduction at the start of the engine are major issues.
On the other hand, in the engine start torque transmission device of the present invention, since the pinion gear of the starter is always meshed with the gear portion provided in the first rotating body, the engine start time can be shortened and the noise at the start can be reduced. .

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

FIG. 1 is a cross-sectional view of an engine starting torque transmission device 1.
The engine starting torque transmission device 1 of this embodiment is fixed to a first rotating body 3 that rotates by being driven by a starter 2 (see FIG. 2) and a crankshaft 5 of an engine 4 (see FIG. 2). The automatic rotation stop / restart of the engine 4 which is configured by a second rotation body 6 and a clutch 7 provided between the first rotation body 3 and the second rotation body 6 and which automatically controls stop and restart of the engine 4 Applies to the system. For example, the system automatically stops the engine 4 when the vehicle stops at a red light at an intersection, or when the vehicle stops due to a traffic jam or the like, and then after a predetermined start operation (for example, when the driver releases the brake pedal). In response, the system automatically restarts the engine 4 and is generally called an idle stop, an eco-run system, or the like.

The first rotating body 3 is a ring gear in which a gear portion 3a is formed on the outer periphery in the radial direction, and the pinion gear 8 (see FIG. 2) of the starter 2 is always meshed with the gear portion 3a. The first rotating body 3 is provided with a cylindrical portion 3b on the inner side in the radial direction, and rotates relative to the boss portion 6a of the second rotating body 6 via a bearing 9 fitted to the inner periphery of the cylindrical portion 3b. Supported as possible. The bearing 9 is a ball bearing with a seal, and the seal plate 9b assembled on both sides of the ball 9a can prevent the lubricant from flowing out and prevent the entry of foreign matters such as water and mud from the outside. .
The second rotating body 6 is, for example, a flywheel, and the boss portion 6 a is fixed to the crankshaft 5 taken out from the side wall of the engine block 10 with bolts 11.

The clutch 7 is configured to transmit torque between the inner portion 12 that rotates integrally with the first rotating body 3, the outer portion 13 that rotates integrally with the second rotating body 6, and the inner portion 12 and the outer portion 13. Are constituted by a plurality of rollers 14 and the like.
The inner portion 12 is provided in a ring shape, and is fitted and fixed to the outer periphery of the cylindrical portion 3 b of the first rotating body 3.
The outer portion 13 is disposed concentrically on the outer side in the radial direction of the inner portion 12, and is fixed to the second rotating body 6 with bolts 15. Needless to say, for example, fixing means such as press-fitting or welding can be employed in addition to the fixing by the bolt 15.
As shown in FIG. 3, a plurality of cam chambers 16 for arranging the rollers 14 are formed in the circumferential direction on the inner circumference of the outer portion 13 between the outer circumference surface of the inner portion 12.

The cam chamber 16 is formed in a wedge shape in which a gap with the outer peripheral surface of the inner portion 12 is gradually narrowed from one end side in the circumferential direction toward the other end side, and on one end side (the wide side) in the circumferential direction. The diameter of the roller 14 is larger than the diameter of the roller 14 on the other end side (narrow side) in the circumferential direction.
The rollers 14 are respectively disposed in the plurality of cam chambers 16 and are biased in the narrowing direction of the cam chambers 16 by springs 17 (for example, leaf springs).
The clutch 7 uses a lubricant having a relatively high viscosity (for example, silicone grease). This lubricant is applied to the inner peripheral surface of the cam chamber 16 in which the roller 14 is in sliding contact.

Subsequently, a seal structure between the first rotating body 3 and the second rotating body 6 will be described.
In the engine starting torque transmission device 1 of the present embodiment, the seal structure according to the present invention is provided on the radially outer peripheral side of the clutch 7, that is, on the outer portion 13 side. On the other hand, the radially inner peripheral side (inner portion 12 side) of the clutch 7 is sealed by the bearing 9 (ball bearing with seal).
The first rotating body 3 has an end face of the outer portion 13 facing in the axial direction, that is, an axial end face (left end face in FIG. 1) opposite to an end face fixed to the second rotating body 6 with a bolt 15. And a plate wall 3c extending in the radial direction (vertical direction in FIG. 1) with a predetermined gap therebetween, and the outer side of the outer portion 13 in the radial direction from the plate wall 3c. A protruding wall 3d protruding in the axial direction in the vicinity of the outer diameter is provided.
The cylindrical portion 3b to which the inner portion 12 is fixed is formed by bending an inner diameter side end portion of the plate wall portion 3c in the axial direction (the same direction as the protruding wall 3d).

As shown in FIG. 1, the outer peripheral surface of the outer portion 13 is provided with a tapered shape in which the outer diameter gradually decreases as the distance from the plate wall portion 3 c increases in the axial direction. Accordingly, the gap formed between the inner peripheral surface of the cylindrical portion 3b and the outer peripheral surface of the outer portion 13 is the smallest at the maximum outer diameter (the left end in the drawing) of the outer portion 13.
A thrust washer 18 is disposed in a gap formed between the axial end surface of the outer portion 13 and the plate wall portion 3c. The thrust washer 18 is fitted and arranged on the outer periphery of a protrusion 13a (see FIG. 1) protruding from the inner periphery of the end surface of the outer portion 13 toward the plate wall 3c. For example, both the thrust washers 18 with a light load of 0.2 Nm or less (The end surface of the outer portion 13 and the surface of the plate wall portion 3c) are in contact with each other.

In addition to the boss portion 6a, the second rotating body 6 includes a side wall portion 6b to which the outer portion 13 is fixed by a bolt 15, and an outer diameter portion 6c provided on the outer side in the radial direction of the side wall portion 6b. .
The side wall portion 6b is provided by connecting the boss portion 6a and the outer diameter portion 6c in a stepped shape. The outer diameter portion 6c is provided so as to protrude largely toward the axial engine side from the side wall portion 6b, and is provided so as to cover the outer periphery of the protruding wall 3d protruding from the plate wall portion 3c. That is, the outer diameter portion 6c is provided such that a portion protruding from the side wall portion 6b toward the axial engine side (hereinafter referred to as a wrap portion 6d) overlaps the protruding wall 3d protruding from the plate wall portion 3c in the axial direction. A certain gap is secured between the inner peripheral surface of 6d and the outer peripheral surface of the protruding wall 3d.

Next, the operation of the engine starting torque transmission device 1 will be described.
a) At engine start When the drive torque of the starter 2 is transmitted from the pinion gear 8 to the first rotating body 3, the clutch 7 is engaged. That is, as shown in FIG. 3, when the inner portion 12 of the clutch 7 rotates in the direction of the arrow, the roller 14 moves to the narrow side of the cam chamber 16 and is sandwiched between the inner portion 12 and the outer portion 13. Since it is locked in between, the rotation of the inner part 12 is transmitted to the outer part 13. As a result, the rotation of the first rotating body 3 is transmitted to the second rotating body 6 via the clutch 7, so that the driving torque of the starter 2 is applied to the crankshaft 5 to which the second rotating body 6 is fixed. It is transmitted and cranking is started.

b) After starting the engine When the engine 4 is completely detonated from cranking, the clutch 7 is disengaged by the rotation of the crankshaft 5 being increased. That is, when the rotation of the crankshaft 5 rises and the rotation speed of the outer portion 13 exceeds the rotation speed of the inner portion 12, the roller 14 moves toward the wide side of the cam chamber 16 against the biasing force of the spring 17. By rotating idly between the inner part 12 and the outer part 13, torque transmission from the outer part 13 to the inner part 12 is interrupted. As a result, the second rotating body 6 and the first rotating body 3 are disconnected from each other, and the rotation of the engine 4 can be prevented from being transmitted to the starter 2.

(Effect of Example 1)
The engine starting torque transmission device 1 according to the present embodiment is provided with a protruding wall 3d that protrudes in the axial direction from the plate wall portion 3c of the first rotating body 3, and this protruding wall 3d extends around the outer periphery of the outer portion 13 in the radial direction. Since it covers, when it gets wet from the outside during engine rotation, it can suppress that water penetrates into the clutch 7 side by the protruding wall 3d. Further, even when the water passes over the protruding wall 3d and is immersed in water, the outer portion 13 of the clutch 7 rotates at a high speed, so that water applied to the outer portion 13 can be blown outward by centrifugal force. Invasion of moisture can be suppressed by the so-called slinger effect.

  In particular, since the outer peripheral surface of the outer portion 13 is provided in a tapered shape in which the outer diameter gradually decreases as it moves away from the plate wall portion 3c in the axial direction, the outer peripheral surface of the outer portion 13 is reversely tapered (outer portion 13). It is possible to effectively prevent water from entering into the direction in which the outer diameter of the water increases. In addition, you may form the through-hole 19 for draining in the side wall part 6b to which the outer part 13 is fixed. As shown in FIG. 1, the through hole 19 is formed through the side wall 6 b in the axial direction along the minimum outer diameter portion of the outer portion 13. As a result, the water that has entered over the protruding wall 3d can be discharged from the through hole 19 to the outside.

Further, since grease having a relatively high viscosity is used as the lubricant for the clutch 7, the lubricant leaks to the outside through a gap formed between the plate wall portion 3 c and the axial end surface of the outer portion 13. Can be suppressed. That is, the plate wall portion 3c and the outer portion 13 are brought close to each other in the axial direction so that the gap therebetween is reduced to such an extent that the lubricant does not flow due to its own viscous resistance, and the radial length of the proximity portion is sufficiently large. By securing a long time, leakage of the lubricant to the outside can be suppressed.
Further, since the protruding wall 3d protruding in the axial direction from the plate wall portion 3c is close to the outer diameter (maximum outer diameter) of the outer portion 13 and the gap between them is small, a relatively high viscosity lubricant (grease) ) Can sufficiently suppress leakage to the outside.

Further, since the thrust washer 18 is sandwiched between the plate wall portion 3c and the axial end surface of the outer portion 13, the sealing effect by the thrust washer 18 can also be expected. As a result, it is possible to enhance the effect of preventing water from entering the clutch and preventing the lubricant of the clutch 7 from leaking, and a highly reliable seal structure can be provided.
As described above, the engine-starting torque transmission device 1 according to the present embodiment does not have a structure in which, for example, a lip portion such as an oil seal is pressed against the outer peripheral surface of the outer portion 13 for sealing, and therefore sliding loss due to the seal occurs. The engine load during the engine rotation can be reduced and the fuel consumption can be improved. In addition, since it is not necessary to use expensive seal parts (such as an oil seal or a bearing with a seal), an inexpensive seal structure can be provided.

FIG. 4 is a cross-sectional view of the engine starting torque transmission device 1.
The second embodiment is different from the first embodiment in the seal structure provided on the outer peripheral side (outer side) in the radial direction of the clutch 7, and the other configuration is the same as the first embodiment.
Hereinafter, the seal structure will be specifically described.
The first rotating body 3 includes an inner protruding wall 3e that protrudes in the axial direction from the plate wall portion 3c toward the outer diameter of the outer portion 13 in the radial direction of the outer portion 13 (the first protruding wall of the present invention). And an outer protruding wall 3f (third protruding wall of the present invention) protruding in the same direction as the inner protruding wall 3e on the outer side in the radial direction from the inner protruding wall 3e.

  The second rotating body 6 is provided with a wrap portion 6d in the radial direction covering the outer periphery of the outer protruding wall 3f, and a certain gap is provided between the inner peripheral surface of the wrap portion 6d and the outer peripheral surface of the outer protruding wall 3f. Is secured. In addition, an intermediate projecting wall 6e (second projecting wall of the present invention) provided integrally with the outer portion 13 is fixed to the side wall portion 6b of the second rotating body 6. The intermediate protruding wall 6e is provided on the outer side in the radial direction of the outer portion 13, and protrudes in the axial direction from the side wall portion 6b side to the plate wall portion 3c side. The inner protruding wall 3e and the outer protruding wall 3f It enters with a predetermined gap between them.

According to the above configuration, a labyrinth structure (maze-like) gap is formed on the outer side in the radial direction of the clutch 7 so that water does not easily enter. Infiltration into the interior can be suppressed. Even when water enters the gap of the labyrinth structure, the intermediate protruding wall 6e and the outer portion 13 rotate at high speed, so that the water applied to the intermediate protruding wall 6e or the outer portion 13 is blown outward by centrifugal force. Can be expected and the waterproofing effect by the slinger can be expected.
Furthermore, the gap formed on the outer peripheral side in the radial direction of the clutch 7 has a labyrinth structure, so that the lubricant (grease) filled in the clutch 7 can be prevented from leaking to the outside.

As in the first embodiment, a thrust washer 18 is disposed between the plate wall portion 3c of the first rotating body 3 and the axial end surface of the outer portion 13, and the thrust washer 18 has a sealing effect. It is also possible to
Also in this second embodiment, as in the first embodiment, the structure is not a structure in which a lip portion such as an oil seal is pressed against the outer peripheral surface of the outer portion 13 and sealed, and no sliding loss occurs due to the seal. The engine load can be reduced and it can contribute to the improvement of fuel consumption. Further, an inexpensive seal structure can be provided without using expensive seal parts (such as an oil seal or a sealed bearing).

5 is a cross-sectional view of the engine starting torque transmission device 1, and FIG. 6 is an enlarged cross-sectional view of a portion A shown in FIG. The third embodiment seals a gap generated between the first rotating body 3 and the outer portion 13 of the clutch 7, that is, seal means for sealing the outer side of the clutch 7 (first seal means of the present invention). ), The labyrinth seal 20 described below is used, and the basic configuration other than the sealing means is the same as in the first and second embodiments.
The labyrinth seal 20 includes a first plate member 21 fixed to the first rotating body 3 or the inner portion 12 of the clutch 7, and a second plate member fixed to the second rotating body 6 or the outer portion 13. The labyrinth groove 23 is formed between the plate members 21 and 22 in a non-contact manner. In addition, the 2nd plate member 22 is formed combining the 2nd plate member 22A and the 2nd plate member 22B, as shown in FIG.

Below, the detailed structure of the labyrinth seal 20 is demonstrated.
First, as shown in FIG. 6, the inner portion 12 of the clutch 7 has an inner outer peripheral surface 12a between the inner outer peripheral surface 12a that contacts the roller 14 during torque transmission and the radial wall surface of the first rotating body 3. A small-diameter annular portion 12b having a smaller outer diameter is provided, and the first plate member 21 is fixed to the small-diameter annular portion 12b. The first plate member 21 has a root portion 21a disposed over the entire axial length of the small-diameter annular portion 12b, and a plate-like portion 21b extending from a part of the root portion 21a to the outer peripheral side in the radial direction. And the front end side of this plate-shaped part 21b is bent at a substantially right angle to the axially opposite clutch side (the left side in the figure), and is formed in a ring shape having a predetermined axial length. Hereinafter, the tip end side (ring-shaped portion) of the plate-like portion 21b bent substantially perpendicularly to the axial direction is referred to as a ring-like portion 21c.

On the other hand, the outer portion 13 of the clutch 7 has an inner diameter larger than that of the outer inner peripheral surface 13b on the first rotating body 3 side (left side in the drawing) from the outer inner peripheral surface 13b that contacts the roller 14 during torque transmission. A large diameter cylindrical portion 13c is provided, and the second plate member 22A is fixed to the inner periphery of the large diameter cylindrical portion 13c.
The second plate member 22A is bent at a substantially right angle from an annular portion 22a extending in the axial direction along the inner peripheral surface of the large-diameter cylindrical portion 13c and an end of the annular portion 22a on the axial clutch side (right side in the drawing). And a plate-like portion 22b extending inward in the radial direction. The second plate member 22A bends along the L-shape of the first plate member 21, and has a substantially constant gap on one end side (clutch side) of the first plate member 21 in the plate thickness direction. Are arranged. Further, the second plate member 22A has an inner peripheral end of the plate-like portion 22b extending from the inner outer peripheral surface 12a to the inner peripheral side in the radial direction (lower than the inner outer peripheral surface 12a shown in FIG. 2). One opening (referred to as an inlet 23a) of the labyrinth groove 23 is formed between the base portion 21a of one plate member 21.

Further, the second plate member 22 </ b> B is fixed to the outer portion 13 on the outer circumferential surface of the outer portion 13 in the radial direction. The second plate member 22B is bent at a substantially right angle from the outer peripheral surface of the outer portion 13 along the axial end surface (the end surface on the left side in the figure), and is radially inward from the ring-shaped portion 21c of the first plate member 21. After extending to the circumferential side, it bends along the L-shape of the first plate member 21 and has a substantially constant gap on the other end side in the thickness direction of the first plate member 21. Has been placed.
The second plate member 22B has a radially inner peripheral end bent at a predetermined length substantially perpendicular to the axially opposite clutch side (the left side in the figure), and the root of the first plate member 21 is provided. The other opening (referred to as outlet 23b) of the labyrinth groove 23 is formed between the portion 21a. As shown in FIG. 6, the second plate member 22A and the second plate member 22B are configured such that the axial end surface of the ring-shaped portion 21c provided on the second plate member 22A is the axial direction of the outer portion 13. The second plate member 22B disposed in the radial direction along the end surface is in contact with and coupled (for example, welded).

With the above configuration, the second plate member 22 (the second plate member 22A and the second plate member 22B) is disposed around the first plate member 21 along the shape of the first plate member 21. A labyrinth groove 23 is formed between the plate members 21 and 22 by covering with a predetermined gap. The labyrinth groove 23 is provided between the inlet 23a and the outlet 23b with a portion that is bent substantially perpendicularly from the radial direction to the axial direction (referred to as a turned-up portion 23c). It is formed on the outer side in the radial direction from the peripheral surface 13b (upward in the drawing from the outer peripheral surface 13b shown in FIG. 6).
The inlet 23a of the labyrinth groove 23 is formed radially inward from the inner peripheral surface 12a, and the outlet 23b of the labyrinth groove 23 is provided extending in the axial direction by a predetermined length. An inner peripheral wall of 23b is formed by the root portion 21a of the first plate member 21, and an outer peripheral wall of the outlet 23b of the labyrinth groove 23 is formed by the second plate member 22B.

(Effect of Example 3)
In the third embodiment, a labyrinth seal 20 is provided as a first sealing means for sealing the outer side of the clutch 7. Since the labyrinth seal 20 is formed with a labyrinth groove 23 that bends in a labyrinth, even if there is water from the outside during engine rotation, it is difficult for water to pass through the labyrinth groove 23 and the clutch from the outside. 7 can be prevented from entering the interior. Similarly, it is difficult for the lubricant (for example, grease) filled in the clutch 7 to flow out through the labyrinth groove 23, and leakage of the lubricant can be prevented.
In addition, the labyrinth seal 20 of this embodiment is not structured to press a lip portion provided on a known oil seal or the like against the outer peripheral surface of the outer seal, so that no sliding loss occurs due to the seal. The engine load during rotation can be reduced, which can contribute to improvement in fuel consumption. Moreover, since it is not necessary to use expensive seal parts (such as an oil seal or a bearing with seal) as the first sealing means, an inexpensive seal structure can be provided.

In the labyrinth seal 20 of the present embodiment, the inlet 23a of the labyrinth groove 23 opens radially inward from the inner outer peripheral surface 12a, so that the lubricant in the vicinity of the inner jumps in the outer peripheral direction due to centrifugal force during engine rotation. Even if this is done, the lubricant does not easily enter the inlet 23a of the labyrinth groove 23, and leakage of the lubricant can be effectively prevented.
Further, the labyrinth seal 20 is provided with a folded portion 23c in which the labyrinth groove 23 is bent substantially perpendicularly from the radial direction to the axial direction, and the outermost diameter portion of the folded portion 23c is radially outer than the outer inner peripheral surface 13b. Is formed. In this case, the distance (the length in the radial direction) from the inlet 23a of the labyrinth groove 23 to the outermost diameter portion of the folded portion 23c is defined as the dimension (diameter between the inner outer peripheral surface 12a and the outer inner peripheral surface 13b of the clutch 7. Larger than the direction distance). That is, since the length of the labyrinth groove 23 extending in the radial direction can be made longer than the physique of the clutch 7, it is possible to enhance the effect of preventing the lubricant from leaking.

Further, the labyrinth seal 20 is formed such that the outlet 23b of the labyrinth groove 23 extends in the axial direction by a predetermined length, so that a second wall that forms the outer peripheral wall of the outlet 23b of the labyrinth groove 23 during engine rotation. When the plate member 22 rotates, the second plate member 22 acts as a slinger, and moisture can be blown outward by centrifugal force. Thereby, in addition to the labyrinth effect, an effect by the slinger (an effect of preventing water from entering from the outside) can be expected, so that the sealing performance can be further improved.
Similarly, the labyrinth seal 20 is provided with a folded portion 23c in which the labyrinth groove 23 bends substantially perpendicularly from the radial direction to the axial direction, so that the shape of the labyrinth groove 23 can be made more complex, and the first plate member It is possible to expect the effect of suppressing the outflow of the lubricant by providing the ring-shaped portion 21c 21 (the portion bent in the axial direction) with a slinger function.

In the labyrinth seal 20 of this embodiment, the first plate member 21 and the second plate member 22 are arranged in a non-contact manner, and a labyrinth groove 23 is formed between the plate members 21 and 22. However, since both the plate members 21 and 22 can be processed into a desired shape by pressing, the labyrinth-shaped labyrinth groove 23 can be easily and inexpensively formed.
Furthermore, since the second plate member 22 is not formed by a single sheet, but is formed by combining the second plate member 22A and the second plate member 22B, the labyrinth groove 23 having a complicated shape can be used. Can be easily formed.

The engine transmission torque transmission device 1 of this embodiment is provided with a labyrinth seal 20 on the outer side of the clutch 7, and on the outer side (atmosphere side) of the labyrinth seal 20, the first rotating body 3 and Since there is a gap between the second rotating body 6 and a foreign matter such as dust or dirt enters from the gap, the periphery of the labyrinth seal 20 (for example, the vicinity of the outlet 23b of the labyrinth groove 23 and the first rotation) There is a possibility that foreign matter may accumulate in the space between the body 3 and the second plate member 22B.
As a countermeasure, in this embodiment, a slinger can be provided on the anti-clutch side (atmosphere side) of the labyrinth seal 20. For example, as shown in FIG. 6, the slinger is constituted by a rotating plate 24 fixed to the second rotating body 6 or the outer portion 13, and the action of centrifugal force generated by the rotation of the rotating plate 24 during engine rotation. With the (slinger effect), entry of foreign matter such as dust and dirt from the outside can be suppressed. Further, in order to further enhance the slinger effect, a dustproof plate 25 can be provided on the first rotating body 3. The dust-proof plate 25 is fixed to the first rotating body 3, is close to the rotating plate 24 in a non-contact manner, and is disposed so as to wrap in the axial direction.

FIG. 7 is a cross-sectional view of the engine starting torque transmission device 1.
In the fourth embodiment, a dust seal 26 is provided on the side opposite to the clutch of the labyrinth seal 20. Providing the labyrinth seal 20 on the outer side of the clutch 7 is the same as in the third embodiment, but uses a dust seal 26 instead of the slinger function by the rotating plate 24 and the dust-proof plate 25 described in the third embodiment. It is.
Specifically, as shown in FIG. 7, the dust seal 26 is attached to the first rotating body 3 on the anti-clutch side (atmosphere side) of the labyrinth seal 20, and the lip portion 26 a of the dust seal 26 is attached to the outer portion 13. The outer peripheral surface is in sliding contact with the outer peripheral surface of the second plate member 22B in the configuration of the third embodiment. As a result, it is possible to prevent foreign matters such as dust and dirt that have entered the gap formed between the first rotating body 3 and the second rotating body 6 from accumulating around the labyrinth seal 20. The stable sealing function can be secured for a long time.

(Modification)
In the labyrinth seal 20 described in the third embodiment, a lubricant having a higher viscosity than the lubricant filled in the clutch 7 may be enclosed in at least a part of the labyrinth groove 23. Thereby, it is possible to further improve the sealing performance, that is, to prevent the lubricant from leaking from the clutch 7 and to prevent the entry of foreign matter (moisture, dust, dust, etc.) from the outside.
In the third embodiment, an example in which the labyrinth seal 20 is provided on the outer side of the clutch 7 is described. However, the labyrinth seal 20 may be provided on the inner side of the clutch 7 or on both the outer side and the inner side. That is, a labyrinth seal 20 may be employed instead of the bearing 9 (ball bearing with seal). This is applicable not only to the third embodiment but also to the engine starting torque transmission device 1 described in the first and second embodiments.

(Example 1) which is sectional drawing of the torque transmission apparatus for engine starting. It is an arrangement plan of an engine starting torque transmission device. It is a front view which shows the structure of a clutch. (Example 2) which is sectional drawing of the torque transmission apparatus for engine starting. (Example 3) which is sectional drawing of the torque transmission apparatus for engine starting. (Example 3) which is an expanded sectional view of the A section shown in FIG. (Example 4) which is sectional drawing of the torque transmission apparatus for engine starting. It is sectional drawing of the torque transmission device for engine starting (Description of a prior art).

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Engine starting torque transmission device 2 Starter 3 1st rotary body 3a Gear part 3c Plate wall 3d Projection wall 3e Inner projecting wall (first projecting wall)
3f Outer protruding wall (third protruding wall)
4 Engine 5 Crankshaft 6 Second rotating body 6e Intermediate protruding wall (second protruding wall)
7 Clutch 8 Pinion gear 9 Bearing (second sealing means)
12 Inner part 13 Outer part 18 Thrust washer 20 Labyrinth seal (first sealing means)
21 First plate member 22A Second plate member A
22B Second plate member B
23 Labyrinth groove 23a Labyrinth groove inlet 23b Labyrinth groove outlet 23c Labyrinth groove folded part (outermost diameter part of labyrinth groove)
24 Rotating plate 25 Dust-proof plate 26 Dust seal

Claims (17)

A first rotating body provided with a gear portion on the outer periphery in the radial direction, the gear portion always meshing with a pinion gear of the starter;
A second rotating body that is fixed to the crankshaft of the engine and that is assembled so as to be relatively rotatable with the first rotating body via a bearing;
A clutch for intermittently transmitting torque between an inner portion provided in the first rotating body and an outer portion provided in the second rotating body;
When the first rotating body rotates by being driven by the starter, the clutch is connected to transmit torque from the first rotating body to the second rotating body, and the second rotating body is An engine starting torque transmission device that, when driven by an engine and rotated, disengages the clutch and blocks torque transmission from the second rotating body to the first rotating body,
The first rotating body has a plate wall disposed in a radial direction with a predetermined gap between the first rotary body and an axial end surface of the outer portion, and the outer side of the outer portion is radially outward from the plate wall. A protruding wall protruding in the axial direction close to the outer diameter of the outer part is provided,
The engine starting torque transmission device, wherein an outer peripheral surface of the outer portion is provided in a tapered shape in which an outer diameter gradually decreases as the distance from the plate wall increases in the axial direction. A first rotating body provided with a gear portion on the outer periphery in the radial direction, the gear portion always meshing with a pinion gear of the starter;
A second rotating body that is fixed to the crankshaft of the engine and that is assembled so as to be relatively rotatable with the first rotating body via a bearing;
A clutch for intermittently transmitting torque between an inner portion provided in the first rotating body and an outer portion provided in the second rotating body;
When the first rotating body rotates by being driven by the starter, the clutch is connected to transmit torque from the first rotating body to the second rotating body, and the second rotating body is An engine starting torque transmission device that, when driven by an engine and rotated, disengages the clutch and blocks torque transmission from the second rotating body to the first rotating body,
The first rotating body has a plate wall disposed in a radial direction with a predetermined gap between the first rotary body and an axial end surface of the outer portion, and the outer side of the outer portion is radially outward from the plate wall. A first projecting wall projecting in the axial direction close to the outer diameter of the outer portion is provided,
The second rotating body is provided with a second projecting wall projecting in the axial direction from the radial outer side of the first projecting wall toward the plate wall, and the second projecting wall, the outer portion, The engine-starting torque transmitting device, wherein the first projecting wall is inserted with a predetermined gap therebetween. In the engine starting torque transmission device according to claim 2,
The first rotating body is provided with a third projecting wall projecting from the plate wall in the axial direction on the radially outer side of the second projecting wall. The third projecting wall, the first projecting wall, The engine-starting torque transmitting device, wherein the second projecting wall is inserted with a predetermined gap therebetween. The torque transmission device for starting an engine according to any one of claims 1 to 3,
A torque transmission device for starting an engine, characterized in that a thrust washer is sandwiched in a gap formed between the plate wall and the axial end surface of the outer portion. A first rotating body provided with a gear portion on the outer periphery in the radial direction, the gear portion always meshing with a pinion gear of the starter;
A second rotating body that is fixed to the crankshaft of the engine and that is assembled so as to be relatively rotatable with the first rotating body via a bearing;
A clutch for intermittently transmitting torque between an inner portion provided in the first rotating body and an outer portion provided in the second rotating body;
A sealing means capable of preventing the lubricant filled in the clutch from flowing out,
When the first rotating body rotates by being driven by the starter, the clutch is connected to transmit torque from the first rotating body to the second rotating body, and the second rotating body is An engine starting torque transmission device that, when driven by an engine and rotated, disengages the clutch and blocks torque transmission from the second rotating body to the first rotating body,
The sealing means seals a gap generated between the first rotating body and the outer portion, and a first sealing means for sealing the gap generated between the first rotating body and the outer portion. And a second labyrinth seal, wherein at least one of the sealing means is a labyrinth seal forming a labyrinth groove. The engine starting torque transmission device according to claim 5,
The labyrinth seal has an inlet that is one of the two openings (inlet and outlet) of the labyrinth groove that opens closest to the clutch, and the inlet is radially inward from the outer peripheral surface of the inner part. A torque transmission device for starting an engine characterized by being formed. In the engine starting torque transmission device according to claim 6,
In the labyrinth seal, the outermost diameter portion of the labyrinth groove extending radially outward from the entrance of the labyrinth groove is formed on the outer side in the radial direction from the inner peripheral surface of the outer portion. Torque transmission device for starting. The engine start torque transmission device according to any one of claims 5 to 7,
The labyrinth seal non-contacts the first plate member fixed to the first rotating body or the inner portion and the second plate member fixed to the second rotating body or the outer portion. An engine starting torque transmission device, wherein the labyrinth groove is formed between both plate members. In the engine starting torque transmission device according to claim 8,
In the labyrinth seal, an outlet which is the other opening of the labyrinth groove is formed to extend in the axial direction toward the anti-clutch side, and an inner peripheral wall of the outlet of the labyrinth groove is formed by the first plate member. An engine-starting torque transmission device, wherein an outer peripheral wall of an outlet of the labyrinth groove is formed by the second plate member. The torque transmission device for starting an engine according to any one of claims 7 to 9,
The first plate member is formed in a substantially L shape that extends radially outward from a root side fixed to the first rotating body or the inner portion, and whose tip is bent in the axial direction. The engine transmission torque transmitting device, wherein the labyrinth groove is formed along the periphery of the first plate member by covering the periphery of the first plate member with the second plate member. . In the engine starting torque transmission device according to claim 10,
The second plate member covering the periphery of the first plate member with a predetermined gap is arranged with a predetermined gap on one end side in the plate thickness direction of the first plate member. The second plate member A is formed in combination with the second plate member B disposed with a predetermined gap on the other end side in the plate thickness direction of the first plate member. Torque transmission device for starting the engine. The torque transmission device for engine starting according to any one of claims 5 to 11,
A rotating plate fixed to the second rotating body or the outer part is provided on the side opposite to the clutch of the labyrinth seal. The rotating plate rotates integrally with the second rotating body and the outer part. A torque transmission device for starting an engine, characterized by being configured as a slinger (or flinger) that prevents foreign matter from entering from the outside by the action of centrifugal force generated by In the engine starting torque transmission device according to claim 12,
A torque transmission device for starting an engine, characterized in that a dust-proof plate is attached to the first rotating body so as to be close to the rotating plate in a non-contact manner and wrapped in the axial direction. The engine start torque transmission device according to any one of claims 5 to 12,
A dust seal attached to the first rotating body is provided on the anti-clutch side of the labyrinth seal, and the lip portion of the dust seal is brought into sliding contact with the outer peripheral surface of the outer portion. apparatus. The torque transmission device for starting an engine according to any one of claims 1 to 14,
A torque transmission device for starting an engine, wherein a lubricant having a viscosity higher than that of a lubricant filled in the clutch is sealed in at least a part of the labyrinth groove. The torque transmission device for starting an engine according to any one of claims 1 to 15,
A torque transmission device for starting an engine, characterized in that grease is used as a lubricant filled in the clutch. The torque transmission device for starting an engine according to any one of claims 1 to 16,
An engine start torque transmission device used in an engine automatic stop / restart system that automatically controls stop and restart of the engine.

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