JPH0637218Y2 - Torque fluctuation absorber - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial field of application> The present invention provides a device in which an inertial body is divided in order to smoothly transmit a rotational torque from a drive shaft to a driven shaft. Integrating at least two inertial bodies to increase the inertial weight for rotation of the drive shaft,
The present invention relates to a torque fluctuation absorbing device that smoothes the rotation of the drive shaft and divides an integrated inertial body after starting.

<Prior Art> In a device that transmits rotational torque, in order to prevent torque fluctuations in a low rotational range from being transmitted to a driven shaft, an inertial body composed of a rotating member incorporated in the device that transmits rotational torque is divided. Some of them are arranged concentrically, the drive-side inertial body is coupled to the drive shaft, and a torque limiting mechanism or a damper mechanism is provided between the driven-side inertial body and the inertial body.

As this device, for example, there is one disclosed in Japanese Patent Publication No. 55-20964, and the torque limiting mechanism comprises a structure in which a driving side inertial body and a friction sliding member having a friction plate are brought into contact with each other by a spring, and the damper mechanism is An elastic member composed of a compression spring is fitted in a groove provided in the friction sliding member and the driven plate fixed to the driven side inertial body.

In this device, when torque above a certain level is generated on the drive side, frictional sliding occurs between the drive side inertial body and the frictional sliding member, and a part of the drive side torque is absorbed by the torque limiting mechanism and the damper mechanism. It acts to smoothly transmit the rotational torque from the shaft to the driven shaft.

In this device, a transmission portion is provided on the outer peripheral portion of the drive-side inertial body, and a drive member that transmits a rotational driving force from the outside at the time of starting is connected to the transmission portion to transmit the rotational driving force to the drive shaft for starting. ing.

Further, as another conventional example, there is a device shown in Japanese Utility Model Laid-Open No. 55-130951, in which a driven side inertial body is slidable and rotatable with respect to a crankshaft and is biased to a drive side by a spring. The inertial body abuts on the outer peripheral portion and is connected by a damper mechanism made of an elastic member. In the inner peripheral portion, a space having a tapered upper portion is formed by each inertial body, and a ball type centrifugal clutch is formed.

The operation of this device is due to the function of the centrifugal clutch.
In the low rotation speed range, the inertial bodies are directly connected to each other by the abutment surface and act as an integral inertial body. In the predetermined rotation speed range, the inertial bodies separate from each other and are connected via the damper mechanism.

<Problems to be solved by the invention> However, in the former torque fluctuation absorbing device of the related art, the rotational driving force from the outside at the time of starting is transmitted to the inertial body on the driving side through the transmitting portion, but is not driven. The inertial body on the side acts from the inertial body on the driving side through the torque limiting mechanism and the damper mechanism, and the rotational driving force from the outside is not sufficiently transmitted.

Therefore, the inertial body on the drive side acts as an inertial weight to smoothly rotate the drive shaft, but the inertial body on the driven side does not act as an inertial weight. Is insufficient compared to.

Therefore, there is a problem that the drive shaft cannot be smoothly rotated and raised at the time of starting, and the starting force is difficult because the inertial force at the time of starting is insufficient, especially at low temperatures.

Further, in the latter device of the related art, the inertial body acts as an integral inertial body in a low rotation range, that is, at the time of starting, but the inertial bodies separate from each other at a rotation of a predetermined number of revolutions or more, and are coupled via a damper mechanism.

In this device, in terms of function, it is necessary to separate each inertial body at an idling speed or less and to operate the damper mechanism,
When traveling, a huge centrifugal force acts on the centrifugal clutch, and excessive stress is applied to the spring, which may cause damage or destruction of the device. Further, although it is possible to provide a damper mechanism structurally, it is difficult to provide a torque limiting mechanism. Therefore, although the startability is improved, the split inertial body does not have sufficient safety and torque fluctuation absorption capability.

On the other hand, in these conventional devices, if the weight of the drive inertial body is increased, the inertial weight for rotary drive at the time of starting can be increased and the startability can be improved, but this leads to the weighting of the device and the acceleration of the vehicle. However, there is a problem that the fuel consumption is deteriorated and the peripheral parts need to be designed and deformed due to the change in the radial and axial dimensions of the device.

Therefore, in the torque fluctuation absorbing device composed of the split inertial body, there is no effective means for improving the startability and ensuring the safety and sufficiently absorbing the torque fluctuation as the split inertial body after starting.

The present invention has as its basic object to eliminate the above-mentioned drawbacks of the prior art.

That is, the present invention is a torque fluctuation absorbing device in which the inertial weight of the drive shaft is increased at the time of start-up without improving the weight of the device to improve the startability and the inertial body is divided after the start-up.
An object of the present invention is to provide a device that secures safety and that effectively absorbs torsional vibration and abrupt torque fluctuation in a low rotation range.

<Means for Solving the Problems> A torque fluctuation absorbing device for absorbing or compensating for a torque fluctuation, wherein at least two torque fluctuation absorbing devices are rotatable relative to each other against the action of at least one damper mechanism. A drive-side inertial body and a driven-side inertial body that are coaxially arranged; and at least one friction device that is provided between the inertial bodies and that is not displaced by a centrifugal force above a limit rotational speed. The device is provided with a centrifugal clutch that is provided non-rotatably on a driven-side inertia body that is coupled to an input shaft of a transmission, and that has a circularly curved curved surface that is provided so as to be displaceable in a radial direction, and the centrifugal clutch is The centrifugal clutch has two end surfaces that are parallel to each other and that are located at both ends of the curved surface, and the centrifugal clutch is slidably guided by the both end surfaces in a radial direction, and at least one inertia A centrifugal clutch guide portion formed to have a concave portion in the radial direction, the centrifugal clutch guide portion being provided on the curved surface of the centrifugal clutch, and the friction surface thereof being disposed on a drive-side inertia body coupled to a crankshaft of an internal combustion engine. It is provided so as to face an arcuate corresponding friction surface provided, and both friction surfaces contact each other at a predetermined rotation speed or less, and are separated by a predetermined distance in the radial direction at the predetermined rotation speed or more. A friction member is provided, and the centrifugal clutch is provided in the centrifugal clutch guide portion such that the friction member is spring-loaded toward the corresponding friction surface and the inner peripheral surface of the centrifugal clutch is in contact with the outer peripheral portion of the centrifugal clutch. The centrifugal clutch guide portion is provided with an inner surface of the recess so as to stop the radial outward movement of the centrifugal clutch due to the centrifugal force at the rotational speed of the limit or more. It is a torque fluctuation absorbing device according to claim which has a blocking portion for preventing radial movement of the centrifugal clutch Te.

Further, as a preferred embodiment, one is that the spring member is made of a first leaf spring material, and the blocking portion (first stopper) is an outer periphery of the first leaf spring material at a speed equal to or higher than the limit rotation speed. The torque fluctuation absorbing device is characterized in that it is provided so as to come into contact with a surface. Second, the blocking member blocks the radial movement of the centrifugal clutch without going through the spring member.

Three is that at least one inertial body provided with the corresponding friction surface is engaged with the inertial body in the circumferential direction and is movable in the radial direction by centrifugal force, and the centrifugal force is equal to or less than the predetermined rotation speed. It is provided so that the driving-side and driven-side inertial bodies are engaged in the circumferential direction via a clutch, and the engagement is released at a predetermined distance from the centrifugal clutch at a predetermined rotation speed or more. A second leaf spring, which is provided with an outer peripheral member, and is arranged to urge the outer peripheral member in a radial outer peripheral direction at a predetermined rotational speed or less and in a radial inner peripheral direction at a predetermined rotational speed or more. And a stopper for stopping the movement in the radial outer peripheral direction when the outer peripheral surface of the outer peripheral member abuts at the predetermined number of revolutions or more. is there.

The "at least one inertial body" described in claim 4 of the utility model registration means the drive-side or driven-side inertial body of at least two coaxially arranged in the first claim. The one "inertia body" refers to at least two coaxially arranged drive-side or driven-side inertial bodies described in the first paragraph except "at least one inertial body".

The centrifugal clutch of the present invention, when the rotational speed of the drive shaft is lower than a predetermined value, contacts the at least one arcuate corresponding friction surface of another inertial body through the friction member. In a rotational range below a limit rotational speed, which is larger than the limit rotational speed, it is possible to move in the radial direction without making the contact.

The arcuate corresponding friction surface is the outer peripheral surface of an inertial body different from the inertial body in which the centrifugal clutch is guided, and is the surface with which the inner peripheral surface of the friction member abuts. It is generated and acts to engage both the inertial bodies on the driving side and the driven side.

Then, a stopper (second stopper) for stopping the radial movement of the centrifugal clutch at the rotational speed above the limit is provided. The blocking portion is located in the centrifugal clutch guide portion and contacts the outer peripheral surface of the centrifugal clutch with or without the spring material to stop the movement thereof.

As the spring material, a leaf spring member is preferable, but a coil spring can also be used.

The engagement portion of the drive and driven inertial bodies may be one that engages or frictionally engages the inertial body and the centrifugal clutch in the circumferential direction,
For example, a centrifugal clutch or a convex portion provided on the centrifugal clutch is fitted into a concave portion provided on the driven side inertial body, and a convex portion provided on the inertial body is further fitted into a concave portion provided on the centrifugal clutch. Alternatively, the driving-side inertial body may be provided with an engaging portion.

The spring member may be any member that biases the centrifugal clutch in the inner circumferential direction and protects the centrifugal clutch by coming into contact with the blocking portion. For example, the spring member is slidably locked in a groove provided in the side wall of the recess. When using a leaf spring,
The outer peripheral surface of the leaf spring is preferably shaped so as to follow the outer peripheral surface (blocking portion surface) of the recess when elastically deforming the leaf spring corresponding to the limit rotation speed. With such a stopper and a spring member, the centrifugal clutch quickly separates from the stopper at the rotational speed below the limit.

Further, the spring member is, for example, an elastic member (coil spring or the like) fitted in a groove provided in the radial direction of the outer peripheral surface of the recess,
Further, the depth of the groove in the radial direction may be the same as the length of the coil spring compressed corresponding to the limit rotational speed. The spring member is preferably a coil spring, but may be an elastic member such as rubber.

Furthermore, the outer peripheral member forming a part of the inertial body engages with the inertial body in the circumferential direction, is movable in the radial direction, and has a shape that does not cause elastic deformation near the predetermined rotational speed. The spring is inserted so as to be elastically deformable, and the inertial body is provided with a transmission part inertial body (outer peripheral member) for transmitting the repulsive force due to the elastic deformation of the second leaf spring. An outer peripheral member stopper (second stopper) that stops the movement in the direction can be provided, and the centrifugal clutch quickly separates from the inertial body and disengages the driven side and the driving side at a predetermined rotation speed or more.

The torque limiting mechanism limits torque transmission between the driving side and the driven side based on the relative relationship between the torque on the drive shaft and the set value, and may be any structure having the above-mentioned mechanism. For example, the torque limiting mechanism may be configured to be connected to the drive-side inertial body, and a plate having a friction plate may be pressed against the driven-side inertial body by a spring member.

Further, the present invention is applied to a torque fluctuation absorbing device in which one or more of a torque limiting mechanism and a damper mechanism are provided between the divided inertial bodies.

<Operation> At the time of starting, the rotational driving force from the outside is transmitted to the drive-side inertial body, and the drive-side inertial body rotates, but the rotational speed is near the minimum and the centrifugal force acting on the centrifugal clutch is also near the minimum.

Since the centrifugal clutch is biased in the inner circumferential direction by the spring member, the frictional resistance between the friction member provided in the centrifugal clutch and another inertial body is large, and the inertial force with which the inertial body and the centrifugal clutch are engaged. Acts as one with the body.

Therefore, both the drive-side inertial body and the driven-side inertial body act as inertial weight with respect to the rotation of the drive shaft, and the rotation of the drive shaft smoothly rises at the time of starting, improving the startability.

After starting, the centrifugal force acting on the centrifugal clutch increases with the rotation of the drive shaft, that is, the rotation of the driving side inertial body, and becomes larger than the biasing force of the spring member. However, the driving-side inertial body and the driven-side inertial body, which were integrated at the time of starting, are separated from each other.

When the rotational speed of the drive-side inertial body further rises and reaches the limit rotational speed, the stopper means stops the radial movement of the centrifugal clutch and stops the deformation of the spring member.

Therefore, excessive stress is not applied to the spring member, and damage or destruction of the device can be prevented. The stopper means can be configured by the spring member and the bottom surface of the concave portion of the guide device of the centrifugal clutch that guides both ends of the centrifugal clutch in the circumferential direction in the radial direction.

Further, since the inertial bodies are connected to each other via one or more of the torque limiting mechanism and the damper mechanism, the torsional vibration and the abrupt torque vibration can be sufficiently absorbed.

Thus, the present invention improves startability, secures the safety of the device after starting, and effectively absorbs torsional vibration and sudden torque fluctuations.

<Embodiment> An embodiment of the present invention will be described with reference to FIGS.

FIG. 1 is a sectional view of the implementation of the present invention.

The illustrated apparatus comprises a drive-side inertial body 1 and a driven-side inertial body 2, each inertial body being connected in series via a damper mechanism 3 and a torque limiting mechanism 4, and at the outer peripheral portion of the apparatus, a centrifugal clutch 5 and a friction plate. 18 is provided.

In the drive side inertial body 1, the drive shaft 6 is spline-fitted,
The driven inertial body 2 is fitted on the drive shaft 6 so as to be slidable and rotatable in the axial direction. An annular member 7 is fixed to the inner peripheral portion of the driven side 2 with bolts 8. The annular member 7 is provided with a flange 9a in the outer peripheral direction and a flange 9b in the inner peripheral direction. Friction plates 10a and 10b are arranged in a space formed by the outer wall of the annular member 7 and the collar 9b and the inner wall of the drive side inertial body 1. Friction plates 10a, 1
0b is pressed against the inner wall by a leaf spring 11 disposed between the friction plates 10a and 10b.

Intermediate plates 11a and 11b are arranged in a space formed by the inner wall of the collar 9a and the inner wall of the driven side inertial body 3, and a disc spring 12 is arranged between the intermediate plates 11a and 11b. Friction plates 13a and 13b are provided on the outer wall surfaces of the intermediate plates 11a and 11b, which are in frictional contact with the collar 9a and the inner wall surface of the driven side inertial body 2, respectively.

Intermediate plates 11a, 1 provided with the collar 9a and friction plates 13a, 13b
The torque limiting mechanism 4 is formed by 1b and the disc spring 12.

The drive-side inertial body 1 and the intermediate plates 11a, 11b are provided with appropriate grooves in the circumferential direction, and coil springs are provided in the respective grooves.
14 are arranged to form the damper mechanism 3.

The outer peripheral edge 15 of the driven side inertial body 2 is bent toward the driving side and covers the outer peripheral surface of the driving side inertial body 1.

The inner peripheral surface of the outer peripheral edge 15 is provided with a plurality of recesses 16 at predetermined intervals in the radial direction, and the centrifugal clutches 5 are loosely fitted in the recesses 16 to form engaging portions. Friction plates 18 are provided on the inner peripheral surface, and both ends in the circumferential direction are formed along the outer peripheral side surface of the recess 16. A leaf spring 19 is arranged in a space formed by the outer peripheral side surface of the recess 16 and the centrifugal clutch 5. 2 and 3 are cross-sectional views of the centrifugal clutch 5 and its peripheral portion, which are perpendicular to the drive shaft 6. The leaf spring 19 is loosely fitted in a groove provided on the side wall of the recess 16, abuts on the centrifugal clutch 5 and urges it in the inner circumferential direction, and when elastically deformed corresponding to the limit rotational speed, the outer peripheral surface thereof. Has a shape along the outer peripheral bottom surface of the concave portion 16.

The operation of the centrifugal clutch will be described with reference to FIGS. 2 and 3.

FIG. 2 shows the state of the centrifugal clutch 5 at a predetermined rotational speed or less, and the leaf spring is more than the centrifugal force applied to the centrifugal clutch 5.
Since the urging force of 19 is large, the centrifugal clutch 5 is a friction member.
It is in contact with the outer peripheral member (outer peripheral portion) 20 of the drive-side inertial body 1 via 18.

Since the drive-side inertial body 1 and the centrifugal clutch 5 are frictionally engaged in the circumferential direction, the drive-side inertial body 1 and the driven-side inertial body 2 are integrated.

As the rotational speed of the drive-side inertial body 1 increases, the centrifugal force applied to the centrifugal clutch 5 increases and the centrifugal weight 17 floats.

FIG. 3 shows the state of the centrifugal clutch 5 at the number of revolutions above the limit.

In the asymptotic process from the predetermined rotation speed to the limit rotation speed, the centrifugal force applied to the centrifugal clutch 5 increases and the amount of elastic deformation of the leaf spring 19 also increases.

When the limit rotation speed is reached, the outer peripheral surface of the leaf spring 19 is recessed 16
Since the deformation along the outer peripheral bottom surface of the plate spring 19 stops, the outer peripheral surface of the centrifugal clutch 5 abuts on the inner peripheral surface of the plate spring 19 and the radial displacement of the centrifugal clutch 5 stops. To do.

In this embodiment, the movement of the centrifugal clutch is stopped by constantly contacting the outer peripheral side surface of the recessed portion 16, the leaf spring, and the entire outer peripheral surface of the centrifugal clutch. The leaf spring and the centrifugal clutch may come into contact with each other at one point to stop the movement of the centrifugal clutch and the change in the elastic deformation of the leaf spring.

FIG. 4 is a sectional view perpendicular to the drive shaft of the centrifugal clutch and its peripheral portion of another embodiment.

A concave portion 16 is provided on the outer peripheral portion of the drive side inertial body 1.
A groove 21 is formed on the outer peripheral side surface of 16 and a coil spring 22 is provided in the groove 21 in the circumferential direction. The radial depth of the groove is the same as that of the compressed coil spring 22 at the rotational speed limit.

The operation of the other embodiment will be described. Since the urging force of the coil spring 22 is larger than the centrifugal force applied to the centrifugal clutch 5 at a predetermined rotational speed or less, the centrifugal clutch 5 is connected to the driven side inertial body 2 via the friction member 18. The drive-side inertial body 1 and the driven-side inertial body 2 are integrated by abutting on the outer peripheral member (outer peripheral portion) 20.

Further, when the rotational speed of the drive-side inertial body rises and reaches the limit rotational speed, the centrifugal clutch 5 comes into contact with the coil spring 22 and abuts the outer peripheral bottom surface of the recessed portion 16 through the biasing force. Of the coil spring 22 is stopped, so that the change in elastic deformation of the coil spring 22 is stopped and the coil spring and the like are protected.

5 to 7 are sectional views of a centrifugal clutch and a peripheral portion thereof according to still another embodiment. FIG. 5 is a sectional view perpendicular to the drive shaft 6.

A concave portion 16 is provided on the outer peripheral portion of the driven side inertial body 2, and
Centrifugal clutch 5 and friction member as in the embodiment of FIGS.
18 and leaf springs 19 are arranged.

The outer peripheral member 20 of the driven side inertial body 2 is movable in the radial direction, and an outer peripheral member stopper 25 is provided on the outer peripheral side of the main body of the drive side inertial body 1. The stopper 25 partially covers the outer peripheral member 20. Covering.

A leaf spring 23 is inserted through the outer peripheral member 20 so as to be elastically deformable in the axial direction. The leaf spring 23 has a shape that does not elastically deform at a predetermined number of rotations, and abuts at the central portion of the outer peripheral portion to transmit the transmission portion 24. To form.

The operation of this embodiment will be described with reference to FIGS. 6 and 7.

6 and 7 are sectional views taken along a plane including the drive shaft 6, and FIG. 6 is a view showing a state of the centrifugal clutch at a predetermined rotation speed or less.

In FIG. 6, when the urging force of the leaf spring 19 toward the center is larger than the centrifugal force, the centrifugal weight 5 is pressed against the outer peripheral member 20 via the friction plate 18, and the leaf spring 23 is applied. Since the force is in the central direction, the outer peripheral member 20 is biased in the central direction.

Therefore, the centrifugal weight 5 and the outer peripheral member 20 are brought into pressure contact with each other, and the drive-side inertial body 1 and the driven-side inertial body 2 are integrated through the engaging portions.

The centrifugal clutch 5 floats as the centrifugal force increases with the increase in the rotation speed of the drive-side inertial body 1, but the outer peripheral member 20 also floats due to the combined force of the centrifugal force and the urging force of the leaf spring 23 via the transmission portion 24. Therefore, the centrifugal weight 5 is pressed against the outer peripheral member 20,
The integration of the driving side inertial body 1 and the driven side inertial body 2 cannot be solved. When the rotation speed of the drive-side inertial body 1 reaches a predetermined rotation speed,
Since the amount of elastic deformation of the leaf spring 23 is 0, no urging force is exerted on the outer peripheral member 20.

When the rotational speed of the drive-side inertial body 1 slightly exceeds the predetermined rotational speed, the leaf spring 23 is elastically deformed in the opposite direction to the previous one, and therefore, at this reversal position, a biasing force outward in the radial direction is generated, and the outer peripheral member.
20 is urged radially outward via the transmission portion 24. Thereafter, the centrifugal clutch 5 is acted on by the increased centrifugal force to move outward in the radial direction, so that the centrifugal clutch 5 and the outer peripheral member 20 are separated from each other at a predetermined rotation speed, and the driving-side inertial body 1 and the driven-side inertial body 3 are separated.
The integration with and is also solved.

When the rotational speed of the drive-side inertial body 1 further rises and reaches the limit rotational speed, the leaf spring 19 extends along the outer peripheral bottom surface of the recess 16 along the centrifugal clutch as in the embodiment of FIGS. 5 and the change in elastic deformation of the leaf spring 19 are stopped, and the leaf spring 19
And protect the centrifugal clutch 5.

The outer peripheral member 20 comes into contact with the outer peripheral member stopper 25 along with the movement in the outer peripheral direction, and the movement is stopped. In this embodiment, the leaf spring 23 has a shape that does not elastically deform at a predetermined rotation speed, but the shape of the leaf spring 23 elastically deforms near a predetermined rotation speed of 1 because the centrifugal clutch and the outer peripheral member separate at a predetermined rotation speed. It may not be included.

Further, in this embodiment, the outer peripheral member 20 is the outer peripheral member stopper 25.
The contact with the centrifugal clutch is immediately after the limit rotation speed, but it may be before that. The point is that after the centrifugal clutch and the outer peripheral member (outer peripheral portion) are separated at a predetermined rotation speed, the centrifugal clutch and the outer circumference are rotated at a higher rotation speed. It suffices that the member (outer peripheral portion) does not come into contact with the structure. In these embodiments, the centrifugal clutches are appropriately provided in one inertial body at predetermined intervals, but the intervals and the number can be changed as necessary. Further, the outer peripheral edge of the driven-side inertial body is bent toward the drive side to provide the concave portion, and the centrifugal clutch is loosely fitted, but the invention is not limited to this, and the outer peripheral edge of the drive-side inertial body is bent toward the driven side. It is also possible to cover the outer peripheral surface of the driven side inertial body, provide a radial recess on the inner peripheral side of the outer peripheral edge, and loosely fit the centrifugal clutch.

The radial movement of the centrifugal clutch is assumed to be stopped at the limit rotational speed by the shape of the first leaf spring or the stopper, but the invention is not limited to this, and the centrifugal clutch can be moved at the limit rotational speed. It may be a structure that is stopped.

Further, although the coil spring is used as the damper mechanism, the damper mechanism is not limited to this and may be another elastic member such as rubber.

Furthermore, in these examples, the device in which the inertial body is divided into two is shown, but at least one centrifugal clutch may be provided between the inertial bodies divided into three or more.

<Effects of the Invention> As described above, the present invention is provided with at least one of a torque limiting mechanism and a damper mechanism between the divided inertial bodies, and the centrifugal clutch and the inner peripheral direction between the inertial bodies. A centrifugal member is provided with a spring member and a stopper for contacting at least one or more outer peripheral parts of other inertial bodies via a friction member to frictionally engage the centrifugal clutch at a predetermined rotational speed or less, In the rotation range from the predetermined number of revolutions to a limit number of revolutions larger than that, the force that frictionally engages gradually decreases because it is possible to move in the radial direction, and finally the friction member and the outer peripheral surface of the inertial body are Separate. Then, above the limit rotational speed, the centrifugal clutch is stopped by the stopper that stops the movement of the centrifugal clutch in the radial direction.

Therefore, at the time of start-up, the engine speed smoothly rises in the same manner as in the torque fluctuation absorbing device composed of an integral inertial body, and the startability at low temperatures is also improved.

After the start, the torque fluctuation absorbing device provided with at least one of the torque limiting mechanism and the damper mechanism has a function of sufficiently absorbing the torsional vibration and the rapid torque fluctuation, and prevents the spring member from being damaged or destroyed. That is, at the time of start-up, it acts as a device made of an integral inertial body, and after start-up, it acts as a device made of a split inertial body ensuring safety.

Further, it has a stopper that firmly blocks the operation of the centrifugal device at a rotational speed of the limit or more, and the centrifugal member is firmly stopped in the outer radial direction by the stopper at a predetermined rotational speed or more, and the spring member is protected. Therefore, it is highly safe.

In addition, the friction member has no constriction and has high strength. Since the centrifugal clutch is completely guided in the circumferential direction by the centrifugal clutch guide portion, there is also an effect that there is little backlash in the centrifugal member in the circumferential direction. . As a result, the centrifugal clutch is protected in combination with the protection of the spring member.

Since the present invention performs the above-mentioned operation, it has an effect of obtaining a device having a simple structure without a complicated structure.

Further, in the present invention, the inertial weight at the time of starting is increased by utilizing at least one driven inertial body without increasing the weight of the driving inertial body.
The weight of the torque fluctuation absorbing device does not increase, the acceleration performance and fuel efficiency of the vehicle are not deteriorated, the startability is improved, and the torque fluctuation absorbing ability is not impaired.

Furthermore, since it is not necessary to change the dimensions in the radial direction and the axial direction with respect to the time of driving, the above effects can be obtained without the need to change the design of peripheral parts.

Further, according to the present invention, by providing the centrifugal clutch on the driven side inertial body, the inertial mass of the driven side inertial body can be increased and the vibration absorbing effect can be enhanced.

[Brief description of drawings]

FIG. 1 is a sectional view of an embodiment of the present invention, FIG. 2 is a partially enlarged sectional view of the same, and FIG. 3 is an enlarged partially sectional view of the same at a limit rotational speed. Is an enlarged partial sectional view of an essential portion of another embodiment, FIG. 5 is an enlarged partial sectional view of an essential portion of another embodiment, which is perpendicular to the drive shaft 6, and FIG. FIG. 7 is a partial cross-sectional view taken along the plane including the enlarged drive shaft 6, and FIG. 7 is a partial cross-sectional view taken along the plane including the enlarged drive shaft 6 at the limit rotational speed in the same manner. 2 ... Driven inertial body 3 ... Damper mechanism, 4 ... Torque limiting mechanism, 5 ... Centrifugal clutch 16 ... Recess, 18 ... Friction plate, 19 ... Leaf spring (spring member,
1st leaf spring) 20 ... outer peripheral member, 22 ... coil spring, 23 ... leaf spring (second leaf spring) 25 ... outer peripheral member stopper

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Masakazu Kamiya 2-chome, Asahi-cho, Kariya city, Aichi Aisin Seiki Co., Ltd. (56) Reference JP-A-51-149446 (JP, A) JP-A-56 -164247 (JP, A) Actually opened 59-113547 (JP, U) Actually opened 59-29447 (JP, U)

Claims (4)

[Scope of utility model registration request] 1. A torque fluctuation absorber for absorbing or compensating for torque fluctuations, wherein at least two coaxially arranged members are rotatable relative to each other against the action of at least one damper mechanism. Is provided between the drive-side inertial body and the driven-side inertial body, and the inertial bodies, and is not displaced by the centrifugal force at a rotational speed higher than the limit.
And two friction devices, the friction device having an arcuate curved surface non-rotatably provided on a driven-side inertia body coupled to an input shaft of a transmission and displaceable in a radial direction. A centrifugal clutch is provided, wherein the centrifugal clutch has parallel end faces located at both ends of the curved surface, and the centrifugal clutch is slidably guided by the end faces, and at least one centrifugal clutch is provided. The inertial body includes a centrifugal clutch guide portion formed to have a concave portion in the radial direction, the centrifugal inertia guide body is provided on the curved surface of the centrifugal clutch, and the friction surface is coupled to the crankshaft of the internal combustion engine. Faces the corresponding arc-shaped friction surfaces arranged at a predetermined rotation speed or less, and both friction surfaces contact each other at a predetermined rotation speed or more, and the friction surfaces are separated by a predetermined distance in the radial direction at the predetermined rotation speed or more. The centrifugal clutch guide is provided so that the friction member is spring-loaded toward the corresponding friction surface and the inner peripheral surface of the centrifugal clutch contacts the outer peripheral portion of the centrifugal clutch. A centrifugal force is applied to the centrifugal clutch guide portion on the inner surface of the centrifugal clutch guide portion so as to stop the radial outward movement of the centrifugal clutch due to the centrifugal force of the centrifugal clutch at a rotational speed equal to or higher than the limit rotational speed. A torque fluctuation absorbing device comprising a blocking portion that blocks radial movement. 2. The spring member is made of a first leaf spring material,
The torque fluctuation absorption according to claim 1, wherein the blocking portion is provided so as to contact the outer peripheral surface of the first leaf spring member at the rotational speed of the limit or more. apparatus. 3. The inner surface of the concave portion of the centrifugal clutch guide portion does not use the spring member so as to stop the radial outward movement of the centrifugal clutch due to the centrifugal force when the rotational speed is equal to or higher than the limit rotational speed. The torque fluctuation absorbing device according to claim 1, further comprising a blocking portion that blocks radial movement of the centrifugal clutch. 4. At least one corresponding friction surface is provided.
The two inertial bodies are engaged with the inertial body in the circumferential direction and can be moved by the centrifugal force in the radial direction, and the inertial bodies on the driving side and the driven side are circled through the centrifugal clutch at the predetermined rotation speed or less. An outer peripheral member that is engaged in the circumferential direction and is provided so as to be disengaged from the centrifugal clutch by a predetermined distance at a predetermined rotational speed or more, and the outer peripheral member is provided at the predetermined rotational speed. A second leaf spring provided so as to be biased in the radial outer peripheral direction below and to be biased in the radial inner circumferential direction at the predetermined rotational speed or more; and the outer peripheral member at the predetermined rotational speed or more. Claim 1 of the utility model, characterized in that it is provided with a stopper that abuts against the outer peripheral surface of the to stop movement in the radial outer peripheral direction.
Item 4. A torque fluctuation absorbing device according to any one of items 3 to 3.