JP2010281270A - Engine starting power transmission device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a normally engaged type engine starting power transmission device for an automatic transmission having a torque converter, mountable without changing the construction on the engine side. <P>SOLUTION: The device includes a starting plate 1, a driving plate 2, and a one-way clutch 3. The starting plate 1 has a ring gear 7 on the outer periphery for normally engaged with a pinion gear. The driving plate 2 is fixed to a crankshaft for transmitting the rotation of the crankshaft to the torque converter. The one-way clutch 3 is provided between the starting plate 1 and the driving plate 2 for transmitting the rotation from the starting plate 1 to the driving plate 2 instead of the rotation from the driving plate 2 to the starting plate 1. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an engine starting power transmission device, and more particularly to an engine starting power transmission device that transmits rotation of a pinion gear rotated by a starter motor to a crankshaft and transmits rotation of the crankshaft to a torque converter.

  In a vehicle, a ring gear is provided on the outer periphery of a flywheel, and a pinion gear of a starter motor meshes with the ring gear. The pinion gear of the starter motor meshes with the ring gear only when the engine is started, and after the engine is started, the mesh is released from the ring gear.

  By the way, in recent years, an idling stop control device for stopping the engine has been proposed and implemented in some vehicles when the vehicle is stopped waiting for a signal. In a vehicle executing such control, it is necessary to restart the engine by operating the starter motor at the start. In such a case, when the conventional starter device is applied, not only does it take a long time to start the engine, but the pinion gear frequently appears and disappears, resulting in frequent noise generation.

  Therefore, a constant mesh starter device as disclosed in Patent Document 1 is provided. This device includes a rotating body having a ring gear on an outer peripheral portion, and a one-way clutch provided between the rotating body and the flywheel. The pinion gear of the starter motor always meshes with the ring gear of the rotating body. Here, when the engine is started, the rotation of the starter motor is transmitted from the pinion gear to the rotating body, and is transmitted to the flywheel and the crankshaft via the one-way clutch. On the other hand, after the engine is started, the rotation of the engine is prevented from being transmitted to the rotating body by the one-way clutch.

JP 2008-121660 A

  The device described in the aforementioned publication is provided between the crankshaft of the engine and the flywheel, and can be mounted on various engines. Such a device requires a similar configuration even in an automatic transmission provided with a torque converter.

  An object of the present invention is to provide an always-meshing engine starting power transmission device that can be installed in an automatic transmission having a torque converter without changing the configuration on the engine side.

  A power transmission device for starting an engine according to claim 1 is a device that transmits rotation of a pinion gear rotated by a starter motor to a crankshaft and transmits rotation of the crankshaft to a torque converter, and includes a starting plate, A drive plate and a one-way clutch are provided. The starting plate is provided with a gear portion on the outer periphery thereof, which always meshes with the pinion gear. The drive plate is fixed to the crankshaft of the engine and transmits the rotation of the crankshaft to the torque converter. The one-way clutch is provided between the start plate and the drive plate, and transmits rotation from the start plate to the drive plate, and does not transmit rotation from the drive plate to the start plate.

  Here, when the engine is started, the rotation of the starter motor is transmitted from the pinion gear to the starting plate, and further transmitted to the drive plate and the crankshaft via the one-way clutch. On the other hand, after the engine is started, the rotation of the crankshaft is transmitted to the torque converter via the drive plate. At this time, since a one-way clutch is provided between the drive plate and the start plate, the rotation of the drive plate is not transmitted to the start plate side.

  With such a configuration, even in an automatic transmission equipped with a torque converter, the engine can be started in a short time and with little noise by a constant mesh starter device.

  According to a second aspect of the present invention, the engine starting power transmission device according to the first aspect further includes a bearing that rotatably supports the one-way clutch with respect to the drive plate.

  Here, since the one-way clutch is supported by the drive plate by the bearing, the one-way clutch can be accurately centered.

  The power transmission device for starting an engine according to claim 3 is the device according to claim 2, wherein the one-way clutch includes an inner ring, an outer ring, and a plurality of rollers disposed between the inner ring and the outer ring. ing. The starting plate is fixed to the inner ring, and the drive plate is fixed to the outer ring.

  An engine starting power transmission device according to a fourth aspect is the device according to the third aspect, wherein the inner ring of the one-way clutch is press-fitted into the outer peripheral portion of the bearing.

  According to a fifth aspect of the present invention, in the power transmission device for starting an engine according to any one of the first to fourth aspects, the drive plate regulates the movement of the roller of the one-way clutch to one side in the axial direction, and the one-way clutch. A plurality of bent portions for supporting the outer peripheral surface of the outer ring. Further, a side cover for restricting movement of the roller of the one-way clutch to the other side in the axial direction is further provided, and an outer peripheral portion of the side cover is bent and locked to an outer peripheral portion of the outer ring of the one-way clutch.

  Here, since the restriction on the axial and radial movements of the roller of the one-way clutch is performed by a part of the drive plate, the configuration is simplified.

  The power transmission device for engine start according to claim 6 is the device according to any one of claims 1 to 5, wherein the drive plate has a plurality of mounting portions to the torque converter on the outer peripheral portion, and the start plate has a diameter of There are holes for mounting the drive plate at positions corresponding to the plurality of mounting portions in the direction.

  The drive plate and the torque converter are generally connected by setting the drive plate on a connecting bolt member fixed to the outer periphery of the torque converter case (front cover) and tightening the nut member. At this time, a work hole is provided in a part of the starting plate so that the work for tightening the nut member is facilitated. For this reason, assembly work becomes easy.

  In the present invention as described above, even in an automatic transmission equipped with a torque converter, the engine can be started in a short time and with less noise by the always meshing starter device.

1 is a longitudinal sectional view of a power transmission device for starting an engine according to an embodiment of the present invention. The partially expanded view of FIG.

[overall structure]
The engine transmission power transmission device shown in FIG. 1 is applied to a system that automatically controls engine stop and restart. According to this system, for example, when the vehicle stops at a red light at an intersection or when the vehicle stops due to a traffic jam, the engine is automatically stopped, and then in response to a predetermined start operation, Automatically restarted. In FIG. 1, only the upper part of the rotation center line (the line OO in FIG. 1) is shown. An engine is arranged on the left side of FIG. 1 and a transmission including a torque converter is arranged on the right side.

  This engine starting power transmission device includes a starting plate 1, a drive plate 2, a one-way clutch 3, and a bearing 4.

[Starting plate]
The starting plate 1 has a plate body 6 that is press-molded into a disk shape, and a ring gear 7 provided on the outer periphery of the plate body 6. The plate body 6 has a hole 6a in the inner periphery, and the entire periphery of the outer periphery is bent to the transmission side to form a cylindrical portion 6b. The ring gear 7 is fitted to the outer periphery of the cylindrical portion 6b, and the inner peripheral portion is fixed to the plate body 6 by welding. Then, the pinion gear 9 of the starter motor 8 is always meshed with the ring gear 7. A plurality of holes 6c for assembly work are formed on the outer periphery of the plate body 6.

[Drive plate]
The drive plate 2 has a first drive plate 14 whose inner peripheral portion is fixed to the crankshaft 10 by bolts 11 and a second drive plate 15 fixed to the outer peripheral portion of the first drive plate 14. .

  The first drive plate 14 is a disk-shaped member, and has a hole 14a in the inner peripheral portion and a cylindrical bearing support portion 14b formed by bending toward the engine side in the outer peripheral portion.

  The second drive plate 15 has a hole 15a on the inner periphery and a mounting hole 15b on the outer periphery. A stepped portion 14 c formed in the first drive plate 14 is inserted into the hole 15 a of the second drive plate 15. And the outer peripheral part of the 1st drive plate 14 and the inner peripheral part of the 2nd drive plate 15 are welded, and both plates 14 and 15 are being fixed.

  Further, the second drive plate 15 is formed with a recess 15c that is recessed toward the transmission side from the inner peripheral portion to the intermediate portion in the radial direction. The inner end of the bearing 4 is supported at the radially inner end of the recess 15c. In addition, the one-way clutch 3 and a part of the bearing 4 on the transmission side are disposed in the recess 15c.

  Further, a plurality of cut-and-raised portions 15 d are formed at predetermined intervals in the circumferential direction on the radially outer portion of the recess 15 c of the second drive plate 15. The plurality of cut-and-raised portions 15d are formed by cutting and raising a part of the second drive plate 15 to the engine side.

[One-way clutch]
The one-way clutch 3 has an inner ring 17, an outer ring 18, and a plurality of rollers 19. The inner ring 17 is press-fitted into the outer periphery of the bearing 4. Further, as shown in an enlarged view in FIG. 2, a stepped portion 17 a having a smaller diameter as compared with other portions is formed at the outer peripheral end of the inner ring 17 on the engine side. The portion is fitted and welded to the stepped portion 17a. A plurality of holes 18 a penetrating in the axial direction are formed in the outer ring 18, and the outer ring 18 is fixed to the second drive plate 15 by rivets 20 penetrating the holes 18 a. A cut-and-raised portion 15 d of the second drive plate 15 is engaged with a part of the outer peripheral surface of the outer ring 18 on the transmission side. As a result, the outer ring 18 is positioned in the radial direction. In addition, an engagement protrusion 18 b that protrudes further radially outward is formed on a part of the outer peripheral surface of the outer ring 18 on the engine side.

  The plurality of rollers 19 can move in the circumferential direction within a predetermined range between the inner ring 17 and the outer ring 18.

  A side cover 21 is provided on the side of the one-way clutch 3 on the engine side. The side cover 21 is a ring-shaped plate member, and the inner diameter is smaller than the inner diameter of the outer ring 18. In other words, the movement of the roller 19 to the engine side is restricted by the inner peripheral end of the side cover 21. An engagement portion 21 a is formed at the outer peripheral end portion of the side cover 21 so as to be bent toward the transmission side over the entire periphery and further bent radially inward. The engagement portion 21 a is an engagement protrusion 18 b of the outer ring 18. Is engaged. The movement of the plurality of rollers 19 toward the axial transmission side is restricted by the second drive plate 15.

  When the rotational speed of the starting plate 1 (inner ring side) is faster than the rotational speed of the drive plate 2 (outer ring) side by the one-way clutch 3 as described above, the torque from the starting plate 1 is driven to the drive plate 2 (crank In the opposite case, torque is not transmitted. Therefore, when the engine is started, the rotation of the starter motor 8 is transmitted through the path of the starting plate 1 → the one-way clutch 3 → the drive plate 2 → the crankshaft 10. On the other hand, after the engine is started, the rotation speed on the crankshaft 10 (drive plate 2) side is increased, so that the rotation of the engine is not transmitted to the starting plate 1.

[bearing]
The bearing 4 is provided to rotatably support the inner ring 17 of the one-way clutch 3 with respect to the drive plate 2. The one-way clutch 3 is centered by the bearing 4 so that the bearing 4 is positioned in the radial direction. The bearing 4 is a lubricant-filled type, and seal members are mounted on both sides in the axial direction.

[Assembly]
When assembling the above engine start power transmission device, first, the engine start power transmission device is fixed to the crankshaft 10. That is, the inner peripheral end of the first drive plate 14 is fixed to the crankshaft 10 by the bolt 11. Next, the torque converter 24 is set on the crankshaft 10. At this time, the fixing bolt 25 of the torque converter 24 is inserted into the mounting hole 15 b of the second drive plate 15. Thereafter, from the outer peripheral side, the nut 26 is fastened to the fixing bolt 25 through the hole 6c for assembling the starter plate 1, and the torque converter 24 is fixed to the drive plate 2.

[Operation]
First, when starting the engine, the starter motor 8 is driven to rotate the pinion gear 9, and this rotation is transmitted to the starting plate 1 via the ring gear 7. The rotation of the starting plate 1 is transmitted to the drive plate 2 via the one-way clutch 3. In the one-way clutch 3, when the inner ring 17 rotates together with the starting plate 1, the roller 19 moves to the narrower gap in the space between the inner ring 17 and the outer ring 18 and is sandwiched between the inner ring 17 and the outer ring 18. Thus, the inner ring 17 and the outer ring 18 are locked. Thereby, the rotation of the starting plate 1 is transmitted to the drive plate 2 side. As a result, the drive torque of the starter motor 8 is transmitted to the crankshaft 10 to which the drive plate 2 is fixed, and cranking is started.

  After the engine is started, that is, when the engine starts rotating by itself, the rotation of the engine is transmitted to the drive plate 2. In such a situation, the rotation speed of the outer ring 18 fixed to the drive plate 2 exceeds the rotation speed of the inner ring 17. Then, the roller 19 moves against the urging force of a spring (not shown) in the wider space between the inner ring 17 and the outer ring 18, and idles between the inner ring 17 and the outer ring 18. For this reason, torque transmission from the outer ring 18 to the inner ring 17 is interrupted. As a result, the drive plate 2 and the starting plate 1 are disconnected, and the rotation of the engine can be prevented from being transmitted to the starter motor 8.

  In the present embodiment as described above, an always-meshing engine starting power transmission device can be realized even in an automatic transmission including a torque converter. Further, by applying this device, it is possible to realize a system that automatically controls stop and restart of the engine without changing the specifications on the engine side.

  In this embodiment, the bearing 4 is supported by the drive plate 2 and the movement of the one-way clutch 3 in the axial direction and the radial direction can be restricted, so that the configuration is simplified. Also, the assembly workability is improved.

  Furthermore, since the ring gear 7, the one-way clutch 3, and the bearing 4 are made of a plate material, an inexpensive and lightweight device can be realized.

[Other Embodiments]
The shapes of the starting plate and the drive plate are not limited to the above embodiment. Further, the arrangement and fixing method of the one-way clutch and the bearing are not limited to the above embodiment.

1 Start plate 2 Drive plate 3 One-way clutch 4 Bearing 8 Starter motor 9 Pinion gear 10 Crankshaft 17 Inner ring 18 Outer ring 19 Roller

Claims (6)

A power transmission device for starting an engine that transmits rotation of a pinion gear rotated by a starter motor to a crankshaft and transmits rotation of the crankshaft to a torque converter,
A starting plate provided on the outer periphery with a gear portion that the pinion gear always meshes;
A drive plate that is fixed to the crankshaft of the engine and transmits rotation of the crankshaft to the torque converter;
A one-way clutch that is provided between the start plate and the drive plate, transmits rotation from the start plate to the drive plate, and does not transmit rotation from the drive plate to the start plate;
A power transmission device for starting an engine comprising:   The power transmission device for engine starting according to claim 1, further comprising a bearing that rotatably supports the one-way clutch with respect to the drive plate. The one-way clutch has an inner ring, an outer ring, and a plurality of rollers disposed between the inner ring and the outer ring,
The starting plate is fixed to the inner ring, and the drive plate is fixed to the outer ring.
The power transmission device for engine starting according to claim 2.   The engine transmission power transmission device according to claim 3, wherein an inner ring of the one-way clutch is press-fitted into an outer peripheral portion of the bearing. The drive plate has a plurality of bent portions for restricting movement of the roller of the one-way clutch to one side in the axial direction and supporting an outer peripheral surface of the outer ring of the one-way clutch,
A side cover that restricts movement of the one-way clutch roller in the other axial direction;
The outer periphery of the side cover is bent and locked to the outer periphery of the outer ring of the one-way clutch,
The power transmission device for engine starting according to any one of claims 1 to 4. The drive plate has a plurality of mounting portions to the torque converter on an outer peripheral portion,
The starting plate has a hole for a drive plate mounting operation at a position corresponding to the plurality of mounting portions in the radial direction.
The power transmission device for engine starting according to any one of claims 1 to 5.

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