JPH0694080A - Ring gear setting structure of flywheel with damper - Google Patents

Abstract

PURPOSE:To provide a flywheel-cum-damper capable of removing a ring gear. CONSTITUTION:This is a flywheel-cum-damper 1 that is featured that a ring gear 6 is fitted in a joining e 9 at the circumferential part of a flywheel body 2 and provided with plural pieces of rivet joints 5 piercing through the circumferential part of this flywheel body 2 and connecting a damper mechanism 4. In this constitution, a spot facing hole 8 inserting each rivet joint 5 into the flywheel body 2 is opened in the joining surface 9 where the ring gear 6 is fitted, and then a guide groove 13, hollowing across in front and in the rear of the ring gear 6, is formed by this spot facing hole 8.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ring gear mounting structure for a flywheel with a damper.

[0002]

2. Description of the Related Art A flywheel connected to a crankshaft of an automobile engine suppresses torque fluctuations of the engine, and a starting force from a starter motor at the time of starting the engine via a ring gear mounted on the outer periphery of the flywheel. Plays the role of transmitting to the crankshaft.

Conventionally, there is a flywheel provided with a damper mechanism in order to enhance the vibration damping effect by the flywheel, and in this case as well, a ring gear is attached to the outer peripheral portion of the flywheel (Japanese Patent Laid-Open No. 1-2207).
44, gazette).

In this type of flywheel with a damper, a plurality of rivet joints penetrating the outer peripheral portion of the flywheel body and connecting the damper mechanism are arranged side by side with the ring gear, and the damper mechanism is connected via the rivet joint. After being attached to the flywheel body, the ring gear is press-fitted into the flywheel body to be coupled.
As a result, the flywheel with a damper can be prevented from becoming large, and the package space can be made compatible with the integrated flywheel that does not include a damper mechanism for the engine.

[0005]

However, in such a conventional flywheel with a damper, the ring gear is press-fitted and coupled to the peripheral surface of the flywheel main body along with the rivet joint of the damper mechanism. for,
When the ring gear was damaged, the ring gear alone could not be removed from the flywheel body, and it was necessary to replace the expensive flywheel body as a unit.

It is an object of the present invention to provide a flywheel with a damper capable of removing the ring gear, focusing on the above problems.

[0007]

According to the present invention, an annular ring gear is fitted to a joint surface formed on an outer peripheral portion of a flywheel body, and a damper mechanism is formed by penetrating the outer peripheral portion of the flywheel body. In a flywheel with a damper including a plurality of joints to be joined, a counterbore for inserting each joint into the flywheel body is opened in a joint surface where the ring gear is fitted, and the front and rear of the ring gear are formed by the counterbore. A guide groove is formed that is recessed across.

[0008]

[Function] Since the joint for coupling the damper mechanism and the ring gear are arranged side by side on the outer peripheral portion of the flywheel body, the flywheel with a damper is prevented from becoming large in size, and an integrated fly without a damper mechanism for the engine The package space with the wheel can be made compatible.

By forming a guide groove that is recessed in the front and rear of the ring gear by a counterbore hole through which each joint is inserted, the jig engaged from the inside of the ring gear is inserted from the guide groove, and the ring gear is inserted. It can be removed from the flywheel body.

[0010]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

As shown in FIG. 1, a flywheel device 1 equipped with a damper for an automobile engine has a flywheel body 2 fixedly connected to a crankshaft of the engine and a drive shaft of a transmission via a clutch 19. The second flywheel 3 coupled to the first flywheel 3 and the damper mechanism 4 coupling the flywheel body 2 and the second flywheel 3 so as to be relatively rotatable.

The flywheel main body 2 has a boss portion 21 fitted on the outer periphery of the crankshaft on the inner peripheral portion thereof, and a plurality of bolts 2 penetrating therethrough and screwed into the crankshaft.
It is concluded through 9.

The second flywheel 3 is rotatably supported by the flywheel main body 2 via a rolling bearing 22, and the torque generated by the engine, which is input from the crankshaft, is applied from the flywheel main body 2 to the torsion spring 31 of the damper mechanism 4. The torque is transmitted to the driven plate 32 via the serration 33 formed on the inner periphery of the driven plate 32, and is transmitted to the second flywheel 3. However, the torsion spring 31 expands and contracts due to the torque fluctuation from the crankshaft. Accordingly, the vibration is absorbed by the resistance imparted by the oil filled in the oil chamber 34 defined on the outer periphery of the driven plate 32.

The damper mechanism 4 is housed between the flywheel main body 2 and a disk-shaped damper cover 35 attached to the rear side of the flywheel main body 2, and the damper cover 35 and the flywheel main body 2 are circumferentially centered at predetermined intervals. Are fastened to each other by a plurality of rivet joints 36 that pass through at intervals, and fastened to each other by a plurality of rivet joints 5 that pass through the respective outer peripheral portions at predetermined intervals. A seal member 37 is interposed between the rivet joint 36 and the rivet joint 5, and the outer peripheral portion of the damper cover 35 is pressed against the flywheel main body 2 by the rivet joint 5 via the retainer 38, so that sufficient sealing is achieved. It secures sex.

An annular ring gear 6 is fitted to the outer periphery of the flywheel main body 2 along with each rivet joint 5.
This ring gear 6 transmits the starting force from the starter motor to the crankshaft when the engine is started.

Since each rivet joint 5 and the ring gear 6 are arranged side by side on the outer peripheral portion of the flywheel main body 2 in this way, the flywheel 1 with a damper is prevented from becoming large, and a damper mechanism is built into the engine. The package space is compatible with the integrated flywheel.

As shown in FIG. 2, on the outer peripheral portion of the flywheel main body 2, a cylindrical joint surface 9 for joining the inner peripheral surface 15 of the ring gear 6 and a rear end surface 16 of the ring gear 6 are joined. An annular joint surface 14 is formed.

Similarly, a rivet hole 7 through which each rivet joint 5 is penetrated and a rivet counterbore hole 8 through which a head 11 of each rivet joint 5 is inserted are formed in the outer peripheral portion of the flywheel main body 2, and each rivet counterbore is formed. The hole 8 has an annular seating surface 12 on which the head 11 of each rivet joint 5 is seated.

As the gist of the present invention, each rivet counterbore hole 8 is opened in the joint surface 9 of the flywheel main body 2 with respect to the ring gear 6, and the rivet counterbore hole 8 is provided in the front and rear of the ring gear 6. A guide groove 13 that is recessed across is formed. Therefore, each rivet counterbore 8
Is arranged so as to overlap with the ring gear 6 in the rotation axis direction.

In this embodiment, the guide groove 13 has a substantially semicircular cross section and is recessed so that the thermal strain generated in the radial direction of the flywheel main body 2 is suppressed.

Since the rivet counterbore holes 8 form the guide groove 13 which is recessed in the front and rear of the ring gear 6, the ring gear 6 is press-fitted into the joint surface 9 of the flywheel body 2. The inner peripheral surface 15 of the
In the free state, which is an arc shape as shown by the two-dot chain line, is deformed to a shape that swells in the guide groove 13 as shown by the solid line,
This ensures that the ring gear 6 is prevented from rotating.
Although the deformation amount of the illustrated ring gear 6 is exaggerated and made larger than it actually is, it is actually quite small.

When the ring gear 6 is replaced due to damage or the like, a jig 41 for expanding the diameter of the ring gear 6 is used as shown in FIGS. The jig 41 includes a plurality of support plates 42 inserted into the ring gear 6 from the respective guide grooves 13, and a base plate 44 to which the base ends of the support plates 42 are rotatably connected via pins 43. Each support plate 42 is provided with a tapered disc 45 that is in sliding contact with the middle of the support plate 42, and a bolt 46 and a nut 47 that attract the disc 45 to the substrate 44.

As shown in FIG. 6, at the tip of each support plate 42, an insert portion 49 is inserted from each guide groove 13 into the inside of the ring gear 6, and at the tip of the insert portion 49, the ring gear 6 is inserted.
It has a pawl 48 which engages with the rear end face 16.

By changing the screwing amounts of the bolt 46 and the nut 47 to bring the disk 45 closer to the substrate 44 and rotating each support plate 42 to the outside, the diameter of the ring gear 6 is expanded and the flywheel main body 2 is moved. It can be removed.

Further, as shown by the chain double-dashed line in FIG. 7, as compared with the conventional device in which all of the rivet counterbore holes 8 are arranged so as to overlap with the ring gear 6 in the direction of the rotation axis, a flywheel. The main body 2 can increase the volume of the outer peripheral portion in front of the ring gear 6 as shown by hatching in the figure,
The degree of freedom in setting the moment of inertia can be expanded.

Next, another embodiment shown in FIG. 8 and FIG.
The opening width of the guide groove 13 is expanded. The guide groove 13 is a bottom surface portion 13 a that is curved concentrically with the joint surface 9.
And the corner portions 13b curved in an arc shape from both ends of the bottom surface portion 13a, the thermal strain generated in the radial direction of the flywheel main body 2 is effectively suppressed.

Also in this case, as shown in FIG. 10, the ring gear 6 is press-fitted into the joint surface 9 of the flywheel main body 2, so that the inner peripheral surface 15 of the ring gear 6 is circled as shown by a chain double-dashed line in FIG. The arcuate free state is deformed into a shape that swells into the guide groove 13 as shown by the solid line, whereby the ring gear 6 is reliably prevented from rotating.

Next, in another embodiment shown in FIGS. 11 and 12, when the ring gear 6 is replaced due to damage or the like,
A jig 51 for expanding the diameter of the ring gear 6 is used. The jig 51 includes six support plates 52 that are inserted into the ring gear 6 from the guide grooves 13 and a hexagonal base frame 54 to which the base ends of the support plates 52 are connected via bolts 56. Prepare The bolts 56 are radially fixed to the base frame 54 via nuts 57, and by changing the screwing positions of the nuts 58 screwed in the bolts 56, the support plates 52 are moved outward in the radial direction. It has become.

As shown in FIG. 13, each support plate 52 has a boss portion 61 through which each bolt 57 is inserted at its base end portion, and is inserted into the inside of the ring gear 6 from each guide groove 13 at its tip end portion. The insertion portion 59 and a claw 60 that engages with the rear end surface 16 of the ring gear 6 are provided at the tip of the insertion portion 59.

By changing the screwing amount of the nut 58 with respect to the bolt 57 and moving each support plate 52 to the outside, the diameter of the ring gear 6 can be expanded and removed from the flywheel main body 2.

[0031]

As described above, according to the present invention, the annular ring gear is fitted to the joint surface formed on the outer peripheral portion of the flywheel body, and the damper mechanism is penetrated through the outer peripheral portion of the flywheel body. In a flywheel with a damper having a plurality of joints for coupling, a counterbore hole for inserting each of the joints in the flywheel body is opened in a joint surface where the ring gear is fitted, and the counterbore of the ring gear is formed by the counterbore hole. Since the guide groove that is recessed in the front and rear is formed, the flywheel with a damper is prevented from becoming large, and the package space is compatible with the integrated flywheel that does not have a built-in damper mechanism for the engine. From the inside of the ring gear, insert the jig that engages and remove the ring gear from the flywheel body. It becomes possible to remove, it can be avoided to replace the expensive damper flywheel per unit upon failure of the ring gear.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a flywheel showing an embodiment of the present invention.

2 is a front view of the same seen from the arrow Z direction in FIG. 1. FIG.

FIG. 3 is also a front view showing a deformed state of the ring gear.

FIG. 4 is a vertical sectional view of a jig for removing the ring gear.

FIG. 5 is a front view of the jig as seen from the direction of arrow Z in FIG.

FIG. 6 is a plan view of a support plate of the same.

FIG. 7 is a longitudinal sectional view of a main part of the flywheel, similarly.

FIG. 8 is a longitudinal sectional view of a main part of a flywheel showing another embodiment.

9 is a front view of the same as seen from the direction of arrow Z in FIG. 8. FIG.

FIG. 10 is a front view showing a deformed state of the ring gear.

FIG. 11 is a vertical sectional view of a jig for removing a ring gear showing still another embodiment.

FIG. 12 is a front view of the jig as seen from the direction of arrow Z in FIG.

FIG. 13 is a plan view of a support plate of the same.

[Explanation of symbols]

 1 Flywheel with damper 2 Flywheel body 3 Second flywheel 4 Damper mechanism 5 Riveting joint 6 Ring gear 7 Riveting hole 8 Rivet counterbore hole 9 Joint surface for ring gear 13 Guide groove

Claims (1)

[Claims] 1. A damper provided with a plurality of joints for fitting an annular ring gear to a joint surface formed on an outer peripheral portion of a flywheel body and penetrating the outer peripheral portion of the flywheel body to couple a damper mechanism. In the attached flywheel, a counterbore hole for inserting each of the joints into the flywheel body is opened in a joint surface where the ring gear is fitted, and a guide groove recessed in the front and rear of the ring gear is formed by the counterbore hole. The ring gear mounting structure of the flywheel with a damper characterized by being formed.