JPH0893856A - Flywheel - Google Patents

Abstract

PURPOSE: To reduce the number of plate materials for rollably supporting rollers so as to reduce a manufacturing cost. CONSTITUTION: A guide hole 11 is formed in a plate material 10 to be connected to a crankshaft. An annular groove 13 is formed in an almost central part in the axial direction of a roller 12. A bottom face 14 of the annular groove 13 is turnably supported in the guide hole 11 and side walls 15a, 15b of the groove 13 are arranged with a specified clearance on both sides of a hole edge of the guide hole 11. A flywheel main body 16 is connected to one side of the plate material 10 and a cover member 17 is connected to the other side. A rear face of the flywheel main body 16 and the cover member 17 are faced to end faces of the roller 12. Abutting of the side walls 15a, 15b of the groove 13 against the hole edge of the guide hole 11 restircts displacement in the axial direction of the roller 12. Falling-out of the roller 12 toward a side is restricted by the flywheel main body 16 and the cover member 17.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flywheel used in a power transmission system such as an automobile engine, and more particularly to a flywheel having a function of absorbing torsional vibration.

[0002]

2. Description of the Related Art An engine for an automobile transmits the energy of an explosion that occurs intermittently to the outside as a driving torque via a crankshaft. Therefore, this type of engine has a problem that the driving torque transmitted to the power transmission system includes a fluctuating torque due to the explosion, and this fluctuating torque easily induces torsional vibration of the power transmission system. .

Therefore, as a flywheel capable of coping with this problem, a flywheel main body is integrally formed with a concave portion having an eyebrows or circular front shape, and a roller is accommodated in this concave portion to cover the upper surface thereof. Those with additional members have been developed. The concave part of the flywheel and the roller rolling inside it constitute a centrifugal pendulum type vibration absorber, which causes the roller to resonate with the torsional vibration of a desired order, thereby absorbing the torsional vibration of that order. ing.
This technique is disclosed, for example, in Japanese Patent Laid-Open No. 56-95637.

However, in this flywheel, since the recess in which the rollers roll is formed integrally with the flywheel body, the flywheel body must be cut with high precision during manufacturing. Not
There is a problem that it leads to a large increase in manufacturing cost.

For this reason, the applicant of the present application has developed a flywheel capable of coping with this, and has proposed a flywheel of Japanese Patent Application No. 6-27155.
I have applied for it first as an issue.

As shown in FIG. 3, in this flywheel, a flywheel body 1 and a vibration absorbing unit 2 are formed separately, and the vibration absorbing unit 2 supports a roller 3 and the roller 3 so that they can roll. It is constituted by a pair of plate members 4 and 5 and a connecting plate 6 connecting the pair of plate members 4 and 5. The pair of plate members 4 and 5 are provided with guide holes 7 and 8, respectively, and an annular projection 9 is provided substantially at the center of the roller 3 in the axial direction. Both ends in the axial direction are rotatably supported in the guide holes 7 and 8 of the plate members 4 and 5 with a predetermined gap interposed therebetween. In the case of this flywheel, the portion where the rollers 3 roll can be easily formed by press forming the plate members 4 and 5 and joining the members to each other, and the recess is directly formed in the flywheel body by cutting. The manufacturing cost can be reduced as compared with the flywheel described above.

[0007]

However, in the above-mentioned conventional flywheel, the guide holes 7 and 8 of both plate members 4 and 5 must be accurately positioned so that the rollers 3 do not incline, and it is extremely difficult. Since a pair of plate materials 4 and 5 which require high strength and processing accuracy are required,
The high manufacturing cost remains a problem.

Therefore, the present invention is intended to provide a flywheel capable of reducing the manufacturing cost without deteriorating the vibration absorbing performance against the torsional vibration.

[0009]

As a means for solving the above-mentioned problems, the present invention provides a flywheel having a function of absorbing torsional vibration by resonance rolling of a roller, in which a plate member coupled to a crankshaft is used. It is provided separately from the flywheel main body, and a guide hole for guiding the rolling of the rollers is formed in this plate material, while an annular groove is formed substantially in the axial center of the roller, and the bottom surface of this annular groove is used as the guide hole. And the side walls of the annular groove are arranged on both sides of the hole edge of the guide hole with a predetermined gap, and the flywheel main body is formed so that its back surface faces one end surface of the roller. The cover member is connected to one side, and the cover member facing the other end surface of the roller is connected to the other side of the plate member.

[0010]

The torque fluctuation of the engine is reduced by the inertial mass of the flywheel body, and the torsional vibration of a predetermined order of the power transmission system is absorbed by the dynamic vibration absorbing action of the roller rolling in the rolling guide hole of the plate material. At this time, the axial displacement of the roller is basically regulated by the contact between the side wall of the annular groove and the hole edge of the rolling guide hole, and the lateral protrusion of the roller due to the input of a large impact is prevented. Is regulated by the flywheel body and the cover member facing the end face of the.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, one embodiment of the present invention will be described with reference to FIGS.

In the drawings, reference numeral 10 denotes a disk-shaped plate member having an inner peripheral edge portion coupled to a crankshaft (not shown) of an engine. The outer peripheral edge portion of the plate member 10 has an eyebrows-shaped guide hole. A plurality of 11 are formed at equal intervals along the circumferential direction. Each of the guide holes 11 accommodates a roller 12 having a predetermined mass that absorbs vibration by a pendulum-like rolling motion. This roller 12 has an axial length of the plate material 1 described above.
The annular groove 1 is formed to be longer than the plate thickness of 0 by a predetermined length, and is substantially wider than the plate thickness of the plate member 10 at the substantially axial center thereof.
3 are formed. The annular groove 13 is substantially fitted in the guide hole 11, and in this state, the bottom portion 14 is rotatably supported in the guide hole 11 and the side wall 15 is formed.
A and 15b are arranged on both sides of the hole edge of the guide hole 11 with a predetermined gap.

A flywheel body 16 having a predetermined mass is provided on one side of the plate member 10, and a thin cover member 17 is provided on the other side.
Are arranged respectively, and these flywheel main bodies 16
The cover member 17 and the cover member 17 are provided on the inner side of the guide hole 11 in the radial direction by the rivet 18, bolts and nuts, etc.
0 is integrally connected. The flywheel main body 16 is formed in a ring shape, the inner peripheral edge portion of which is coupled to the plate member 10 as described above, and the radially outer portion of this coupling portion has a stepped shape on the transmission side (right side in the drawing). The back surface of the radially outer portion of the bent portion faces one end surface of the roller 12 with a predetermined gap. A clutch cover (not shown) is attached to the outer peripheral edge of the flywheel body 16, and a clutch disc facing (not shown) is provided on the front surface of the transmission side (right side in the figure) when the clutch is engaged. Are in frictional contact. On the other hand, the cover member 17 is the plate member 1 of the roller 12.
The bulging portion is formed so as to cover the protruding portion from 0, and the inner surface of the bulging portion faces the other end surface of the roller 12 with a predetermined gap.

The ring gear 1 is provided on the outer peripheral surface of the plate member 10.
9 is welded so that the pinion (not shown) of the starter motor meshes with its ring gear 19 when the engine is started.

Since this flywheel is constructed as described above, the torque fluctuation of the engine is basically reduced by the inertial mass of the flywheel main body 16, and the torsional vibration of a predetermined order of the power transmission system is caused by the roller 12. It is absorbed by the dynamic vibration absorbing effect of rolling. At this time, the roller 12 makes rolling contact with the guide hole 11 of the plate material 10 at the bottom surface of the annular groove 13 and is displaced axially by the contact between the side walls 15a and 15b of the annular groove 13 and the edge of the guide hole 11. Regulated,
The flywheel body 1 faces the end surface of the roller 12 when the engine is started or stopped, or when the engine is abnormally vibrating or when the engine is abnormally vibrating.
6 and the cover member 17.

In the case of this flywheel, since the rollers 12 are supported by the guide holes 11 of the single plate member 10, positioning with high precision between the guide holes as in the case of supporting them by the guide holes of a plurality of plate members. Is unnecessary, and the guide hole 11 can be stably supported in the guide hole 11 without tilting as long as the guide hole 11 is accurately formed at the time of press-molding the plate material 10. Manufacturing becomes easier. Further, in addition to this, since only one plate member 10 is required to support the roller 12 that requires extremely high strength and processing accuracy, the rollers are supported in the guide holes of a plurality of plate members. It is possible to significantly reduce the manufacturing cost as compared with the flywheel of.

Further, in this flywheel,
Since the plate material 10 and the flywheel main body 16 are integrally connected by the rivets 18 and the like, there is also an advantage that the balance adjustment becomes easier as compared with the case where the plate material 10 and the flywheel main body 16 are separately attached to the crankshaft. is there.

[0018]

As described above, according to the present invention, the plate material connected to the crankshaft is provided separately from the flywheel main body, and the guide material for guiding the rolling of the rollers is formed in the plate material while the roller material is formed. An annular groove is formed substantially at the center in the axial direction, the bottom surface of the annular groove is rotatably supported in the guide hole, and the side walls of the annular groove are arranged on both sides of the hole edge of the guide hole with a predetermined gap, and The flywheel body,
By connecting to one side of the plate material so that its back surface faces one end surface of the roller, and by connecting the cover member facing the other end surface of the roller to the other side of this plate material, The annular groove and the guide hole can accurately guide the rolling of the roller, and the flywheel body and the cover member can prevent the roller from jumping out to the side, and the guide hole is formed on a single plate material. Therefore, the manufacturing cost can be surely reduced because it is sufficient.

[Brief description of drawings]

FIG. 1 is a sectional view taken along line AA of FIG. 2 showing an embodiment of the present invention.

FIG. 2 is a partially cutaway front view showing the same embodiment.

FIG. 3 is a sectional view showing a conventional technique.

[Explanation of symbols]

 10 ... Plate material, 11 ... Guide hole, 12 ... Roller, 13 ... Annular groove, 14 ... Bottom surface, 15a, 15b ... Side wall, 16 ... Flywheel main body, 17 ... Cover member.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Masanori Matsuoka, 1370 Onna, Atsugi, Kanagawa Pref., Within Unisia Jecs Co., Ltd. (72) Inventor, Yamaichizaki Ichiro, Takaracho, Kanagawa-ku, Yokohama, Japan Nissan Motor Co., Ltd. In the company

Claims (1)

[Claims] 1. In a flywheel having a function of absorbing torsional vibration by resonance rolling of a roller, a plate material coupled to a crankshaft is provided separately from a flywheel main body, and rolling of the roller is performed on the plate material. While forming a guide hole to guide, forming an annular groove in the axial center of the roller,
The bottom surface of the annular groove is rotatably supported in the guide hole, and the side walls of the annular groove are arranged with a predetermined gap on both sides of the hole edge of the guide hole. A flywheel, characterized in that it is joined to one side of the plate member so as to face the end face, and a cover member facing the other end face of the roller is joined to the other side of the plate member.