JPH1130291A - Damper gear and bearing locking method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the number of part items by making the tip of a tubular part of a first rotating member come close to or contact with a second side end of a first race being fitted in an outer boundary of the tubular part of the first rotating member while a first side end is supported on the supporting part. SOLUTION: A bearing 6 is mainly composed of an inner race 13 (first race), an outer race (second race) and plural pieces of rolling elements 15. This inner race 13 is provided with a first side end 13a at the engine side, a second side end 13b at the transmission side and an inner circumferential surface 13c. The first side end 13a is supported on a supporting part 11 formed in a first flywheel 1. The inner circumferential surface 13c comes into contact with an outer circumferential surface 12b of a tubular part 12 of the first flywheel 1. With this adherence between this inner circumferential surface 13c and the tubular part 12, the inner race 13 is made so as to be relatively unrotatable to the first flywheel 1. In addition to these operations, a tip of the tubular part 12 is bent and tip of this bent part 12a is made to come close to or to contact with the second side end 13b of the inner race 13.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a damper device having a bearing disposed between rotating members whose relative rotation is restricted within a predetermined angle by an elastic member, and a method of fixing the bearing.

[0002]

2. Description of the Related Art A flywheel is mounted on a rear end of a crankshaft of an engine, and its rotational moment of inertia prevents uneven rotation during low-speed operation. A start ring gear, a clutch and the like are attached to the flywheel. This flywheel is connected to the first flywheel and the second flywheel.
A flywheel assembly is known which is divided into a flywheel and a damper mechanism provided between the flywheel and the flywheel. The damper mechanism includes an elastic member arranged to be compressed in the circumferential direction when the two flywheels rotate relative to each other. Some damper mechanisms include a friction mechanism acting in parallel with the elastic member.

[0003]

The second flywheel is rotatably supported on the first flywheel via a bearing. Generally, the first flywheel is provided with a tubular portion projecting toward the second flywheel at the center thereof, and the bearing is mounted on the outer peripheral surface of the tubular portion.
More specifically, the inner race of the bearing is press-fitted to the outer peripheral surface of the cylindrical portion, and the first side end surface is in contact with the support provided on the cylindrical portion. A snap ring for retaining the bearing is fixed to the outer peripheral surface of the cylindrical portion at a position close to the second side end surface of the inner race.

In the above-mentioned conventional flywheel assembly, high precision cutting is required on the outer peripheral surface of the cylindrical portion into which the bearing is pressed. An object of the present invention is to reduce the number of parts of a damper device. Another object of the present invention is to eliminate the need for high-precision machining of a cylindrical portion for mounting a bearing.

[0005]

According to a first aspect of the present invention, there is provided a damper device including a first rotating member, a bearing, a second rotating member, and an elastic member. The first rotating member has a tubular portion and a support portion provided on one end side of the tubular portion so as to extend radially outward from the tubular portion. The bearing includes a first race fitted on the outer periphery of the cylindrical portion of the first rotating member and having the first side end face supported by the support portion, and a second race concentrically arranged on the outer periphery of the first race. And a plurality of rolling elements arranged between the two races. The second rotating member is fixed to the second race of the bearing. The elastic member limits the relative rotation between the first rotating member and the second rotating member within a predetermined angle. The distal end of the cylindrical portion is bent, and approaches or contacts the second side end surface of the first race.

[0006] In this damper device, the tip of the tubular portion is close to or in contact with the second side end surface of the first race, and realizes the same function as a conventional snap ring. Therefore, the number of parts of the damper device is small. A bearing fixing method according to a second aspect is a method of fixing a bearing to a rotating member having a cylindrical portion. The bearing fixing method includes the following steps.

[0007] A bearing is fitted around the cylindrical portion. ◎ Bend the tip of the cylindrical part and bring it close to or into contact with the side end face of the bearing. According to this fixing method, in the step of bending the tip of the tubular portion, the tubular portion is elastically deformed and comes into close contact with the inner peripheral surface or the outer peripheral surface of the race. As a result, the race of the bearing is prevented from rotating around the cylindrical portion. Since the cylindrical portion is brought into close contact with the bearing after mounting the bearing in this manner, the high-precision cutting work required for the conventional cylindrical portion is not required.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First Embodiment FIG. 11 is a partial schematic view of a vehicle to which an embodiment of the present invention is applied. The vehicle includes a vehicle body, a driving device, a traveling device, and the like. The driving device includes an engine 91,
And a drive train for transmitting the power of the engine 91 to the tires. The drive train is mainly
It is composed of a clutch device 92, a transmission 93, a differential, and the like. The clutch device 92
It is attached to a flywheel assembly 96 of the engine 91. The clutch device 92 includes a clutch disk assembly 94 and a clutch cover assembly 95 shown in FIG.

FIG. 1 is a schematic longitudinal sectional view of a flywheel assembly 96. OO in FIG. 1 is the rotation center line of the flywheel assembly 96. Engine 9 on the left side of FIG.
1 is arranged, and a transmission 93 is arranged on the right side. The flywheel assembly 96 mainly includes the first flywheel 1 on the input side, the second flywheel 2 on the output side, and the first flywheel 1 and the second flywheel 2.
And a damper mechanism 3 for circumferentially connecting them and absorbing and attenuating torsional vibration.

The first flywheel 1 (first rotating member, rotating member) is a relatively thick disk-shaped member attached to the crankshaft 7 of the engine 91. The first flywheel 1 is formed of, for example, cast iron or steel.
On the inner peripheral side of the first flywheel 1, a plurality of holes 1a arranged in the circumferential direction are formed. The hole 1a is an unthreaded hole, into which a crank bolt 9 described later is inserted. The crank bolt 9 is provided in the hole 1 of the first flywheel 1.
a and is screwed into a screw hole formed in the end face of the crankshaft 7. As a result, the first flywheel 1 rotates integrally with the crankshaft 7. The first flywheel 1 has a concave portion in which the damper mechanism 3 is arranged on the transmission side at a radially intermediate portion.

The second flywheel 2 is a relatively thick disk-shaped member disposed on the transmission side of the first flywheel 1. The second flywheel 2 is formed of, for example, cast iron or steel. 2nd flywheel 2
Has a flat annular friction surface 2a on the transmission side. The friction coupling portion of the clutch disk assembly 94 is arranged near the friction surface 2a. Furthermore, the second
A clutch cover assembly 9 is provided on the outer periphery of the flywheel 2.
The clutch cover No. 5 is fixed so as not to rotate relatively.
Thus, the clutch device 92 including the clutch disk assembly 94 and the clutch cover assembly 95 is mounted on the second flywheel 2.

Next, a structure for supporting the second flywheel 2 so as to be rotatable relative to the first flywheel 1 will be described with reference to FIGS. A tubular portion 12 is formed on an inner peripheral portion of the first flywheel 1, and the tubular portion 12 extends toward the transmission in parallel with the rotation center line. A surface (supporting portion 11) extending radially outward is formed at the engine-side end of the cylindrical portion 12. At the inner peripheral end of the second flywheel 2, a tubular portion 19 extending toward the engine is formed. The cylindrical portion 19 is formed concentrically on the outer peripheral side of the cylindrical portion 12 of the first flywheel 1. An annular support portion 20 extending inward in the radial direction is formed at the tip of the cylindrical portion 19. The bearing 6 is arranged between the cylindrical portion 12 of the first flywheel 1 and the cylindrical portion 19 of the second flywheel 2.

The bearing 6 mainly includes an inner ring 13 (first race,
(A race), an outer race 14 (a second race), and a plurality of rolling elements 15. The inner ring 13 is an annular member, and has a first side end surface 13a on the engine side, a second side end surface 13b on the transmission side, and an inner peripheral surface 13c. The first side end face 13a is in contact with and supported by a support portion 11 formed on the first flywheel 1. Inner circumference 1
3c is the outer peripheral surface 12 of the cylindrical portion 12 of the first flywheel 1.
b. Due to the close contact between the inner peripheral surface 13 c and the cylindrical portion 12, the inner ring 13 cannot rotate relative to the first flywheel 1. The tip of the cylindrical portion 12 is bent outward in the radial direction by roller processing. That is,
The end of the annular bent portion 12a is the second side end surface 1 of the inner ring 13.
3b is close to or in contact with 3b. The outer ring 14 is an annular member concentrically arranged on the outer peripheral side of the inner ring 13, and has a first side end surface 14 a on the engine side and a second
It has a side end surface 14b and an outer peripheral surface 14c. Outer ring 1
The first side end surface 14 a of the fourth flywheel 4 is in contact with and supported by the support portion 20 of the second flywheel 2. Further, the outer peripheral surface 14 c of the outer ring 14 is press-fitted into the inner peripheral surface 19 a of the cylindrical portion 19.

The rolling elements 15 are a plurality of balls arranged between the inner ring 13 and the outer ring 14. Annular seal portions 16 are arranged on both axial sides of the inner ring 13 and the outer ring 14. The seal portion 16 includes an annular seal member 17 that comes into contact with each end face of the inner ring 13 and the outer ring 14, and a cone spring 18 for bringing the seal member 17 into close contact with the inner ring 13 and the outer ring 14.

Next, the damper mechanism 3 will be described.
The damper mechanism 3 includes an elastic member 4 and a viscous damping unit 5. The viscous damping part 5 mainly includes the annular housing 2.
2 is comprised. The annular housing 22 is a member for forming a viscous resistance generating chamber, and is filled with a viscous fluid. The annular housing 22 is arranged on the outer peripheral side of the concave portion of the first flywheel 1. A first drive plate 23 is disposed on the engine side of the annular housing 22 and a second drive plate 2 is disposed on the transmission side.
4 are arranged. The first drive plate 23 and the second drive plate 24 are disk-shaped members. The first drive plate 23, the second drive plate 24, and the annular housing 22 are connected by pins 26. Further, the second drive plate 24 is fixed to an outer peripheral portion of the first flywheel 1 by bolts 27. Also,
The seal plate 25 is fixed to the first flywheel 1 by bolts 27. The seal plate 25 is the second
An annular member for sealing the transmission side of the drive plate 24. As described above, the annular housing 22, the first drive plate 23, the second drive plate 24, and the seal plate 25 function as a drive-side member together with the first flywheel 1.

First and second drive plates 23, 24
Between the driven plate 2 is an annular plate member
8 are arranged. A wavy tooth 31 is formed on the inner peripheral portion of the driven plate 28, and the wavy tooth 31
The flywheel 2 is engaged with the wavy teeth 21 of the flywheel 2 so as not to rotate relatively. Thus, the driven plate 28 functions as a driven member together with the second flywheel 2.

At a radially intermediate portion of the driven plate 28, a storage portion 32 extending in the circumferential direction is formed. The elastic member 4 is disposed in the storage section 32. Elastic member 4
Is a coil spring extending in the circumferential direction. Both ends of the elastic member 4 in the circumferential direction are the first and second drive plates 2.
3 and 24 are in contact. The elastic member 4 limits the relative rotation between the first flywheel 1 and the second flywheel 2 within a predetermined angle. Thus, the torque of the first and second drive plates 23, 24 can be transmitted to the driven plate 28 via the elastic member 4.

An outer peripheral portion of the driven plate 28 is inserted into an inner peripheral side of the annular housing 22. In addition, a slider 30 that can be engaged with the projection of the driven plate 28 is disposed in the annular housing 22. The slider 30, the driven plate 28, and the annular housing 22 constitute a viscous damping unit, and viscous resistance is generated.

Next, a method of fixing the bearing 6 to the first and second flywheels 1 and 2 will be described. First, the inner peripheral bearing 6 of the second flywheel 2 is attached to the second flywheel 2. That is, the outer ring 14 is pressed into the inner peripheral side of the cylindrical portion 19. As a result, the first side end surface 14a is supported by the support portion 2 of the second flywheel 2.
Contact 0. Subsequently, the bearing 6 is attached to the first flywheel 1 together with the second flywheel 2. In the state shown in FIG. 2, the cylindrical portion 12 of the first flywheel 1 extends straight in the axial direction. The cylindrical part 12 is the inner ring 1
It is longer than 3 in the axial direction. A slight gap is secured between the inner peripheral surface 13c of the inner ring 13 and the outer peripheral surface of the cylindrical portion 12.

Subsequently, as shown in FIG. 3, the bending roller 79 is pressed against the tip of the tubular portion 12 while rotating the first flywheel 1 while being received by a jig (not shown).
The bending roller 79 includes a support portion 80 and a shaft 82 on the support portion 80.
And a rotating body 81 supported by the rotating body 81. The outer peripheral surface of the rotating body 81 is curved inward to form the bent portion 12a, and has a drum shape as a whole.
As a result, the tip of the tubular portion 12 is bent toward the outer peripheral side to form a bent portion 12a. At this time, the cylindrical portion 12 is deformed to the outer peripheral side, and the outer peripheral surface 12b of the cylindrical portion 12 is
3c. As a result, the inner ring 13 cannot rotate relative to the tubular portion 12.

According to the above-described method of fixing the bearing 6, the bearing 6 can be fixed to the cylindrical portion 12 by a simple method without increasing the processing accuracy of the outer peripheral surface 12b of the cylindrical portion 12. Further, the amount of deformation of the inner ring 13 of the bearing 6 is smaller than that of a conventional fixing method by press fitting. Further, a snap ring is not required as compared with the related art, and the number of parts is small. I have. Also,
Since the snap ring and the groove for attaching the snap ring are not required, the axial dimension of the tubular portion 12 is short. Second Embodiment A flywheel assembly 96 shown in FIG. 5 is a device for transmitting torque from a crankshaft 47 of an engine to a main drive shaft 48 of a transmission. The flywheel assembly 96 mainly includes the first flywheel 41, the second flywheel 42, and the damper mechanism 43.

The first flywheel 41 includes an annular inertia 61 and a first drive plate 62 and a second drive plate 63 fixed to the annular inertia 61. The first drive plate 62 and the second drive plate 63 have an outer peripheral portion fixed to the annular inertia 61 and constitute a viscous chamber filled with a viscous fluid.
A cup 64 is welded to the inner periphery of the first drive plate 62. The cup 64 is open to the transmission side, and its distal end has a cylindrical portion 5 protruding further toward the transmission than the inner peripheral edge of the first drive plate 62.
It is 2. The first drive plate 62, the second drive plate 63, and the cup 64 are sheet metal members.

The first flywheel 41 is fixed to the crankshaft 47 via a flexible plate 58. The flexible plate 58 is a disk-shaped member and can bend in the axial direction and the bending direction. The inner peripheral portion of the flexible plate 58 has a plurality of crank bolts 49.
Thus, it is fixed to the end face of the crankshaft 47.
The outer periphery of the flexible plate 58 has a plurality of bolts 60.
Is fixed to the annular inertia 61. further,
A plurality of plate members 59 are fixed to the outer peripheral side of the engine of the flexible plate 58.

The second flywheel 42 includes a hub 65, a driven plate 66, a first inertia member 68, a second inertia member 69, a ring gear 73, and the like. The hub 65 is a cylindrical member, and has a spline hole that is engaged with the main drive shaft 48 so as to be relatively non-rotatable. The hub 65 has a flange portion 70 extending outward. The driven plate 66 and the first inertia member 68 are fixed to an outer peripheral portion of the flange portion 70 by a plurality of rivets 84. In the first drive plate 62, a hole 83 is provided at a position corresponding to the rivet 84.
Are formed. The driven plate 66 is disposed between the first drive plate 62 and the second drive plate 63. The first inertia member 68 is arranged on the transmission side of the second drive plate 63. The second inertia member 69 is a first inertia member 68
Is fixed to the transmission side. The ring gear 73 is fixed to an outer peripheral portion of the first inertia member 68.

Next, the damper mechanism 43 will be described. The damper mechanism 43 includes an elastic member 44 and a viscous damper 45.
It is composed of The viscous damping part 45 is mainly constituted by the annular housing 44. Annular housing 4
Reference numeral 4 denotes a member for forming a viscous resistance generating chamber, and the inside thereof is filled with a viscous fluid. The annular housing 44 is arranged on the outer peripheral side of the viscous chamber.

A storage portion 67 extending in the circumferential direction is formed at a radially intermediate portion of the driven plate 66. The elastic member 44 is disposed in the storage section 67. The elastic member 44 is a coil spring extending in the circumferential direction. Both ends in the circumferential direction of the elastic member 44 are in contact with the first and second drive plates 62 and 63. The elastic member 44 limits the relative rotation between the first flywheel 1 and the second flywheel 2 within a predetermined angle. Thus, the torque of the first and second drive plates 62 and 63 is
Can be transmitted to the driven plate 66 via the.

The outer periphery of the driven plate 66 is inserted into the inner periphery of the annular housing 74. In addition, a slider 75 that can be engaged with the projection of the driven plate 66 is disposed in the annular housing 74. The slider 75, the driven plate 66, and the annular housing 74 constitute a viscous damping unit, and viscous resistance is generated.

Next, referring to FIG.
The structure for supporting the first 2 on the first flywheel 41 so as to be relatively rotatable will be described. The cylindrical portion 52 is formed in the cup 64 of the first flywheel 41 as described above, and the inner peripheral end of the first drive plate 62 is welded to the engine-side end of the cylindrical portion 52. Have been. The end surface is a support portion 51 that extends radially outward perpendicular to the outer peripheral surface of the tubular portion 52. A bearing 46 is disposed between the cylindrical portion 52 of the cup 64 and the flange portion 70 of the second flywheel 42 to support the second flywheel 42 to the first flywheel 41 so as to be relatively rotatable. .

The bearing 46 includes an inner ring 53, an outer ring 54, and a plurality of rolling elements 55. The inner ring 53 is an annular member, and includes a first side end surface 53a and a second side end surface 53b.
And an inner peripheral surface 53c. The outer ring 54 is
Is an annular member concentrically disposed on the outer peripheral side of the first member, and has a first side end surface 54a, a second side end surface 54b, and an outer peripheral surface 54c. The rolling elements 55 are a plurality of balls arranged between the inner ring 53 and the outer ring 54. The seal member 57 includes the inner ring 5
3 and the outer ring 54 are arranged on both sides in the axial direction to seal in the axial direction. The first side end face 53 a of the inner race 53 is in contact with the support portion 51 of the first drive plate 62. Also,
The inner peripheral surface 53 c of the inner ring 53 is in close contact with the outer peripheral surface of the tubular portion 52. Thus, the inner ring 53 cannot rotate relative to the cylindrical portion 52. The distal end of the tubular portion 52 is a bent portion 52a bent toward the outer peripheral side. Bent part 52a
Is in contact with or close to the second side end surface 53b.

The outer peripheral surface 54c of the outer race 54 has a flange 70
Is press-fitted into the inner peripheral surface 71 of the cylindrical portion formed at the bottom.
Further, the second side end surface 54b is in contact with a support surface 72 formed on the flange portion 70. Next, a method of fixing the bearing 46 to the first and second flywheels 41 and 42 will be described.

First, as shown in FIG. 6, the bearing 46 is arranged on the outer peripheral side of the cylindrical portion 52. As a result, the first side end surface 53a contacts the support portion 51. At this time, a slight gap is formed between the inner peripheral surface 53c of the inner ring 53 and the outer peripheral surface of the tubular portion 52. Subsequently, as shown in FIG. 7, the bent portion 52a is formed using the bending roller 79 described above.
Next, the driven plate 66 is mounted on the first drive plate 62 together with other members constituting the damper mechanism 43. Further, as shown in FIG. 8, the hub 65 is mounted on the first drive plate 62 and the driven plate 66 side. At this time, the outer ring 54 is
Is press-fitted, and the second side end surface 54b contacts the support surface 72. Next, the first and second inertia members 68 and 69 are set, and the holes 83 formed in the first drive plate 62 are formed.
, The driven plate 66, the flange 70 and the first inertia member 68 are fixed by the rivets 84.

The same advantageous effects as in the above embodiment can be obtained by the method of fixing the bearing 46 in this embodiment. Third Embodiment As shown in FIG. 9, the distal ends of the tubular portions 12, 52 may be cut and bent. In this case, a notch is made by pressing, and each part is bent to the outer peripheral side to form a bent portion 7.
6 is formed. In the bearing fixing portion shown in FIG. 9, the bent portions 76 are bent every other in the circumferential direction. That is, the other portion 77 extends in the axial direction without being bent. In the embodiment shown in FIG. 10, all the portions are bent to the outer peripheral side to form a bent portion 76. In this embodiment, the same effects as in the above embodiment can be obtained.

[0033]

According to the damper device of the first aspect, the tip of the tubular portion is close to or in contact with the second side end surface of the first race, and realizes the same function as a conventional snap ring. . Therefore, the number of parts of the damper device is small. In the bearing fixing method according to the second aspect, since the cylindrical portion is brought into close contact with the bearing after the bearing is mounted, high-precision cutting work required for the conventional cylindrical portion is not required.

[Brief description of the drawings]

FIG. 1 is a schematic longitudinal sectional view of a flywheel assembly employing an embodiment of the present invention.

FIG. 2 is a partially enlarged view of FIG. 1, and is a cross-sectional view showing a bearing fixing portion.

FIG. 3 is a view corresponding to FIG. 2, showing a bearing fixing method.

FIG. 4 is a schematic plan view of a bearing fixing portion.

FIG. 5 is a schematic longitudinal sectional view of a flywheel assembly according to a second embodiment.

FIG. 6 is a longitudinal sectional view showing a method for fixing a bearing in a bearing fixing portion.

FIG. 7 is a longitudinal sectional view showing a method of fixing a bearing in a bearing fixing portion.

FIG. 8 is a longitudinal sectional view showing a method of fixing a bearing in a bearing fixing portion.

FIG. 9 is a schematic plan view of a bearing fixing portion according to a third embodiment.

FIG. 10 is a schematic plan view of a bearing fixing portion according to a third embodiment.

FIG. 11 is a conceptual diagram showing a power transmission unit of a vehicle to which the present invention is applied.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 1st flywheel (1st rotating member, rotating member) 2 2nd flywheel (2nd rotating member) 3 Damper mechanism 4 Elastic member 5 Viscous damping part 6 Bearing 7 Crankshaft 8 Main drive shaft 11 Support part 12 Tubular Part 12a Bent part 12b Outer peripheral surface 13 Inner ring (first race, race) 13a First side end surface 13b Second side end surface 13c Inner peripheral surface 14 Outer ring (second race) 14a First side end surface 14b Second side end surface 14c Outer peripheral surface 15 Rolling element 41 First flywheel (first rotating member, rotating member) 42 Second flywheel (second rotating member) 43 Damper mechanism 44 Elastic member 45 Viscous damping part 46 Bearing 51 Supporting part 52 Tubular part 52a Bending part 52b Outer peripheral surface 53 Inner ring (first race, race) 53a First side end surface 53b Second side end surface 53c Inner periphery 54 outer ring (second race) 54a first end surface 54b second end surface 54c outer peripheral surface 55 rolling element 57 sealing member 96 flywheel assembly (damper unit)

Claims (2)

[Claims] A first rotating member having a tubular portion and a support portion provided at one end of the tubular portion so as to extend radially outward from the tubular portion; and a tube of the first rotating member. A first race fitted on the outer periphery of the shaped portion and having a first side end surface supported by the support portion; and a second race concentrically arranged on the outer peripheral side of the first race.
A bearing including a plurality of rolling elements disposed between the two races; a second rotating member fixed to the second race of the bearing; and a relative rotation between the first rotating member and the second rotating member. An elastic member for restricting the angle within a predetermined angle, wherein a tip of the cylindrical portion is bent, and is close to or in contact with a second side end surface of the first race. 2. A method for fixing a bearing to a rotating member having a cylindrical portion, the method comprising: fitting the bearing around the cylindrical portion; A step of approaching or abutting the side end surface.