JPH0235081Y2 - - Google Patents

Description

[Detailed explanation of the idea] [Industrial application field] The present invention relates to a torque fluctuation absorbing device.

[Conventional technology]

BACKGROUND ART In engines of automobiles, ships, etc., a torque fluctuation absorbing device is provided in a power transmission device in order to absorb torque fluctuations thereof.

Conventional torque fluctuation absorbing devices of this type include, for example, a device as disclosed in Japanese Patent Publication No. 56-43176.

A conventional device will be explained in advance using FIGS. 7 to 9. The torque fluctuation absorbing device shown in FIGS. 7 to 9 consists of a two-part flywheel, and includes a drive plate 101 (drive-side inertia body) that is connected to the engine crankshaft and rotates, and a It consists of a flywheel 102 (driven side inertia body) which stands concentrically in parallel and rotates while being connected to a driven side member so as to be rotatable relative to the drive plate 101, and is connected via a spring mechanism 103. A spring mechanism 103 having spring seats at both ends and a torque limit mechanism 104 are disposed between the drive plate 101 and the flywheel 102, and rotation of the crankshaft is controlled via the drive plate 101, the spring mechanism 103, and the torque limit mechanism 104. flywheel 10
It has become possible to convey this to 2 people. 105 is a gap between the drive plate 101 and the flywheel 102.

[The problem that the idea aims to solve]

The shape of the spring seat 106 provided at both ends of the spring of the conventional spring mechanism 103 and the two inertial bodies is the shape of the spring seat 106 on the driving side (flat plate members 107, 1
08) and driven side (driven plates 109, 11
0) Both have the same substantially semi-cylindrical shape 106a, but when the vehicle is actually driven, the spring seat 10
Convex portion 106 at the contact portion with the driven side inertia body of No. 6 (contact portion with the driven plates 109, 110)
If the wear of a is large and the wear progresses, the spring of the spring mechanism 103 and the outer peripheral member come into direct sliding contact, and the hysteresis torque becomes unstable. Therefore, there is a problem that the torque fluctuation absorption characteristics become unstable.

In order to solve such problems, (a) the thickness of the driven plates 109, 110 is increased to reduce the surface pressure at the contact area between the spring seat 106 and the driven plates 109, 110; (b) the spring seat 106 semi-cylindrical portions 10
Countermeasures can be considered, such as making 6a protrude greatly in the circumferential direction to reduce the surface pressure at the contact part, but (a) will increase the axial dimension of the two-part flywheel, and (b) will increase the length of the driven plates 109, 110. As the circumferential width of the arm becomes smaller, the driven plate 1
Another problem arises in that the strength of 09,110 is reduced.

The purpose of the present invention is to reduce wear on the seat of the spring mechanism of a torque fluctuation absorber.

[Means to solve the problem]

The above object is achieved by the following torque fluctuation absorbing device of the present invention. That is, in a torque fluctuation absorbing device consisting of a two-part flywheel in which a driving-side inertial body and a driven-side inertial body are connected by a spring mechanism, the spring mechanism consists of an elastic member and sheets provided at both ends of the elastic member. Each seat has a first contact portion that removably abuts an engagement portion with the seat provided on the driving side inertial body side, and an engagement portion with the seat provided on the driven side inertial body side. and a second abutting part that removably abuts the first and second abutting parts of the sheet, one of the first and second abutting parts of the sheet is formed as a convex part in the circumferential direction, and the other is formed as a concave part in the circumferential direction. A torque fluctuation absorbing device characterized by being formed in.

[Effect]

Since the contact portion of the seat with the driven-side inertia body (the contact portion with the arm 16b of the driven disk 16 in the example) is formed in the recess (the recess 14b in the example), the recess is formed in an oval shape. By forming the arm long in the direction, the contact area (in the example, arm 1
(Contact area between the circumferential protrusion of 6b and the recess 14b)
is increased, surface pressure is reduced, and sheet wear is suppressed.

In addition, the recessed portion of the seat has parallel walls on both sides in the axial direction, and by fitting the engaging portion with the sheet on the driven side inertial body into the recessed portion, the inclination of the engaging portion from the plane parallel to the wall is reduced. is suppressed, and wear of the seat due to tilting of the engaging portion is also suppressed.

〔Example〕

Hereinafter, preferred embodiments of the torque fluctuation absorbing device of the present invention will be described with reference to the drawings.

In FIGS. 1 and 6, a drive plate 2 as a drive-side inertia body is connected to an engine crankshaft 1 as a drive shaft by bolts, and the drive plate 2 rotates integrally with the crankshaft 1. . Drive plate 2
A ring-shaped outer drive plate main body 2a is sandwiched between steel plate side plates 2c and 2d from both sides, and these are joined together with rivets 3, and an inner drive plate main body 2b is integrated with one side plate 2c using screws 4. consists of a combination of

Among the side plates constituting a part of the drive plate 2, the side plate 2d on the side of the flywheel 6 is bent so as to cover the outer periphery of the flywheel 6 so that the outer periphery thereof has a substantially L-shaped cross section to form a cylindrical protrusion 2d'. The cylindrical protrusion 2d' covers the outer peripheral opening of a gap 11 existing between the drive plate 2 and the flywheel 6 and extending linearly in the radial direction. A starter ring gear 5 is attached to the outer periphery of the outer drive plate main body 2a by press fit, shrink fit, or the like.

The drive plate 2 is placed parallel to the drive plate 2 and coaxially with the drive plate 2.
A flywheel 6 is arranged to be rotatable relative to the drive plate 2, and the flywheel 6 is rotatably supported by the drive plate 2 via a bearing 7. This flywheel 6, together with a driven disk 16 and a torque limit mechanism 15, which will be described later,
Configures the driven side inertia body. 9 is a pin for positioning a clutch (not shown), and 9 is a screw hole for attaching a clutch cover (not shown). The flywheel 6 is a flywheel main body 6 in order to accommodate a torque limit mechanism 15 which will be described later.
The flywheel main body 6a and the driven plate 6b are integrally connected to each other by bolts 10.

A spring mechanism 12 is provided between the drive plate 2 and the flywheel 6. The spring mechanism 12 has an elastic member and sheets provided at both ends of the elastic member. The elastic member comprises, for example, a coil spring 13, and the seat comprises, for example, a spring seat 14 having a cushion 14e which can be deformed with a spring constant stronger than that of the spring 13. The spring seats 14 provided at both ends of the coil spring 13 have the same shape. When torque is applied to the torque fluctuation absorbing device, one spring seat 14 comes into contact with the circumferential edges of the windows and notches of the side plates 2c and 2d of the drive plate 2, and the other spring seat 14
has a structure in which it comes into contact with a protrusion 16c that protrudes in the circumferential direction of an arm 16b that extends radially outward of the driven disk 16, which will be described later.

FIG. 6 shows only the spring seat 14 taken out. As shown in the figure, the spring seat 14 is attached to and detached from the circumferential edges of the windows and notches of the side plates 2c and 2d of the drive plate 2 on the drive side (the engagement portion with the seat provided on the drive side inertial body side). A first abutting portion that freely abuts is formed on a convex portion 14a that is convex in the circumferential direction toward the drive plate 2, and a protrusion 16c (provided on the driven side inertial body side) of the driven disk 16b on the driven side. A second abutting portion that removably abuts on a recessed portion 14b that is recessed in the circumferential direction and that engages with the protruding portion 16c is located within the inner diameter of the coil spring 13. It is formed. The center _R2 of the concave portion 14b is closer to the center _R1 of the convex portion 14a than the spring 13.
(See Figure 2). A rib 14c is formed between the protrusion 14a and the recess 14b, and the rib 14c forms a side wall of the recess 14b. The spring seat 14 is provided with a substantially cylindrical protrusion 14d at an end opposite to the end where the recess 14b is provided. The cushion 14e has a protrusion 14
It is attached to d. A pair of spring seats 1
4 are disposed at both ends of the spring 13 with protrusions 14d or cushions 14e facing each other, and function as seats for the spring 13.

Then, in a state where no torque is applied, one spring seat 14 and the spring seat 1
Arm 16 of driven disk 16 facing 4
There is a gap between the ball and the ball b, giving rise to the play characteristic A shown in FIG. However, characteristic A depicts hysteresis due to the presence of a hysteresis mechanism 18, which will be described later. Also, in Fig. 5, characteristic B is spring 1
The characteristic C is caused by the deflection of spring 1.
3 compresses and the spring seats 14 come into contact with each other, the cushion 14 of the spring seat 14
This is caused by the deformation of e.

The torque limit mechanism 15 is connected to the flywheel 6
As shown in FIG. 3, it is interposed between a pair of driven disks 16, and the pair of driven disks 16 are connected to a flywheel main body 6a,
It consists of a cone spring 17 that presses against the driven plate 6b, and a lining 16a made of a friction material that is attached to the surface of the driven disk 16 on the side that contacts the flywheel body 6a and the driven plate 6b. The cone spring 17 determines the pressing force of the driven disc 16 against the flywheel body 6a and the driven plate 6b, but when the torque applied to the torque fluctuation absorbing device is within the torque corresponding to the frictional force determined by this pressing force. is driven disk 16
and the flywheel rotate together, and when the torque exceeds the torque corresponding to the frictional force, the driven disk 16 and the flywheel 6 cause relative slippage, cutting off the transmission of torque exceeding the torque corresponding to the frictional force. . Characteristic D in FIG. 5 shows a property in which the transmission of torque exceeding the torque corresponding to the frictional force is cut off.

The hysteresis mechanism 18 is connected to the drive plate 2
and the flywheel 6. FIG. 4 shows the hysteresis mechanism 18. As shown in the figure, the hysteresis mechanism 18 includes a plate 1 to which a lining member 19a made of a friction material is attached.
9 and attach the bent portion to the drive plate 2.
The plate 19 is fixed to the drive plate 2 in the circumferential direction by engaging with the hole 22 made in the side plate 2c, and the disc spring 20 and the plate 21 are interposed between the plate 19 and the side plate 2c to line the plate 19. It consists of a member 19a pressed against the flywheel 6. The sliding friction between the lining member 19a and the flywheel 6 provides hysteresis characteristics as shown in FIG.

Next, the operation in the above embodiment will be explained. Torque from a crankshaft 1 of an engine is transmitted to a drive plate 2 that rotates integrally with the crankshaft 1, and is transmitted to a flywheel 6 via a spring mechanism 12, a torque limit mechanism 15, and a hysteresis mechanism 18. At this time, minute fluctuations in the torque of the crankshaft 1 and fluctuations in engine rotational speed are caused by a vibration system consisting of the inertial body of the drive plate 2 and flywheel 6, which are connected via the spring of the spring mechanism 12 and the damping of the hysteresis mechanism 18. It is then absorbed.

In order to effectively absorb torque fluctuations above the idle rotation speed, the relative rotational displacement (torsion angle) between the drive plate 2 and the flywheel 6 must be adjusted as shown in characteristics A, B, C, and D in Fig. 5. When the relative rotational displacement is large, it is necessary to have soft spring characteristics, and in order to make the spring mechanism 12 compact, it is necessary to have hard spring characteristics when the relative rotational displacement is large. When torque is applied, it is necessary to limit the torque and transmit it to the clutch in order to protect the powertrain. The torque fluctuation absorbing device of the present invention operates to satisfy the above requirements. That is, when the torsion angle is small, the play between the spring seat 14 and the driven disc 16 and the low frictional force of the hysteresis mechanism 15 work effectively to obtain characteristic A, and when the spring seat 14 and the driven disc 16 come into contact, At a twist angle greater than that, the spring 13 bends and obtains characteristic B, and as the twist angle becomes larger, the deflection of the spring 13 increases and the spring seat 14
When they come into contact with each other, the cushion 14e of the spring seat 14 is bent by a twisting angle larger than that, and characteristic C is obtained. When the torque further increases and becomes excessive, the torque limit mechanism 15 continues to slip, and torque exceeding a certain value is cut off, resulting in characteristic D. In this way, torque fluctuations are effectively absorbed and transmitted to the powertrain.

One condition for stably obtaining the above characteristics is that it is undesirable for the internal mechanism of the torque fluctuation absorber, especially the spring seat 14 of the spring mechanism 12, to wear out significantly and change the characteristics of the spring mechanism 12. There is a thing. In the device of the present invention, the driven disk 1 on the driven side, which has been particularly prone to wear among the spring seats 14,
6 (second contact part), and the contact part with the edge of the notch (first
Contrary to the contact portion of
b, so the protrusion 1 of the driven disk 16
The radial contact area with the spring seat 6c is increased, and as a result, the surface pressure of the contact surface that receives the centrifugal force of the spring mechanism 12 during rotation is reduced, and wear of the spring seat 14 is reduced. In this case, there are no problems such as an increase in the axial dimension of the flywheel or a decrease in the strength of the driven disk, as in the prior art.

Furthermore, since the center R ₂ of the concave portion 14b is located closer to the spring seat located on the opposite side of the spring 13 than the center R ₁ of the convex portion 14a, there is a margin for arrangement in the circumferential direction. coil spring 13
In addition to being able to lengthen the length, it is also possible to have a large amount of play with the driven disk 16, thereby increasing the torsion angle between the driving side and the driven side.
The resonance frequency of the torque fluctuation absorbing device can be lowered, and the torque absorption effect can be enhanced.

Further, the recessed portion 14b has ribs 14c on both sides in the flywheel axial direction, and the driven disc 1
6 is difficult to move in the axial direction, the driven disk 16 is prevented from tilting, and this prevents the spring seat 14 from being worn out due to twisting.
It does not deviate from 4 in the axial direction. More ribs 1
4c also serves as reinforcement for the spring seat 14.

[Effect of idea]

As is clear from the above description, according to the torque fluctuation absorbing device of the present invention, one of the first abutting portion of the seat, which corresponds to the driving side, and the second abutting portion, which corresponds to the driven side, is formed into a convex portion. Since the other side was formed into a concave portion,
(b) Reduction of sheet wear due to increased contact area, (b)
This has the effect of softening the spring constant by increasing the length of the spring and the amount of play, thereby increasing the torque fluctuation absorption effect. In addition, the concave portion of the seat prevents the member (driven disk) that fits into it from becoming distorted and the resulting seat wear, as well as (c) preventing the seat from coming off from the driven plate, and (d) ensuring the strength of the seat. You can also get the desired effect.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a torque fluctuation absorbing device according to an embodiment of the present invention, and is a sectional view taken along the - line in FIG. 2, and FIG. 2 shows an internal structure of the device shown in FIG. FIG. 3 is a partial sectional view of the torque limit mechanism section of the device section of FIG. 1, and FIG.
The figure is a partial cross-sectional view of the hysteresis mechanism part of the device in Figure 1, Figure 5 is a torque transmission characteristic diagram of the device in Figure 1, and Figure 6 shows the spring seat of the device in Figure 1 taken out. 7 is a sectional view of a conventional torque fluctuation absorbing device, FIG. 8 is a front view of the device shown in FIG. 7 with a part cut away to show the internal structure, and FIG.
The figure is a perspective view of the spring seat of the device in Figure 7;
It is. 1... Drive shaft (crankshaft), 2... Drive plate, 2c, 2d... Side plate, 2d'... Cylindrical projection, 6... Flywheel, 6a... Flywheel body, 6b... Driven plate, 12...
... Spring mechanism, 13 ... Spring, 14 ... Spring seat, 14a ... Convex part (first contact part),
14b... Recessed portion (second contact portion), 14c... Rib, 15... Torque limit mechanism, 16... Driven disk, 16c... Protrusion of driven disk, 18... Hysteresis mechanism.

Claims (1)

[Claims for Utility Model Registration] In a torque fluctuation absorbing device comprising a two-part flywheel in which a driving side inertial body and a driven side inertial body are connected by a spring mechanism, the spring mechanism includes an elastic member and both ends of the elastic member. Each seat includes a first contact portion that removably abuts an engagement portion with the seat provided on the driving side inertial body side, and a first contact portion provided on the driven side inertial body side. a second abutting portion that removably abuts an engaging portion with the sheet, one of the first and second abutting portions of the sheet being formed into a convex portion in the circumferential direction; A torque fluctuation absorbing device characterized in that the other is formed in a recessed portion in the circumferential direction.