JPH0647152Y2 - Torque fluctuation absorber - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention is interposed between an internal combustion engine for a vehicle and a transmission, and absorbs torque fluctuations of the engine to suppress rotation fluctuations of an input shaft of the transmission. The present invention relates to a torque fluctuation absorbing device that suppresses the fluctuation.

(Prior Art) A crankshaft (output shaft) of an internal combustion engine for a vehicle constantly undergoes torque fluctuations due to the structure of the internal combustion engine or operating conditions. There is a demand for a device that absorbs torque fluctuations in order to prevent damage and the like. BACKGROUND ART Conventionally, a torque fluctuation absorbing device incorporated in a flywheel of a dry single plate friction clutch is known. Flywheel 3 of a dry type single plate type friction clutch incorporating this torque fluctuation absorbing device
Is, as shown in FIGS. 5 and 6, a main driving part 9 and a driven part.
10 is a split flywheel that is divided into 10 and a thick inertia rotary body, in which the rotational torque of the main driving portion 9 is a torque fluctuation absorbing device interposed between the main driving portion 9 and the driven portion 10, that is,
It is transmitted to the driven portion 10 via the hysteresis mechanism 11, the spring mechanism 12 and the damping / torque limit mechanism 13. Driving part 9
Is a drive plate 14 located on the crankshaft 2 side of the flywheel 3, and the drive plate 14
An annular groove 14a is formed on the surface facing the driven portion 10 along the entire circumference at a substantially central position in the radial direction.

The driven portion 10 is composed of a driven plate 18 and a holder 19 which are located on the transmission side (not shown) of the flywheel 3, and both the driven plate 18 and the holder 19 are formed in an annular shape. An annular groove 18a is formed on the side surface of the driven portion 9 of the driven plate 18 so as to face the annular groove 14a, and the annular grooves 18a and 14a form an annular space 17 that opens radially inward. A peripheral wall 19a is formed in the vicinity of the inner peripheral edge of the holder 19 so as to project toward the driven plate 18 side. An annular space 21 is formed between the opposing surfaces of the holder 19 and the holder 19 so as to open radially outward.

The main driving part 9 and the driven part 10 are arranged so as to be rotatable relative to each other via a bearing 22, and the open ends of the annular spaces 17 and 21 are opposed to each other to form a closed annular space inside the flywheel 3. There is.

The hysteresis mechanism 11 is composed of a friction plate 23 that frictionally engages between the main driving part 9 and the driven part 10. The friction plate 23 is formed in an annular shape near the inner peripheral edge of the wall surface of the holder 19 facing the drive plate 14. Drive plate fitted in the groove 24
The rotation torque of the main driving portion 9 is transmitted to the driven portion 10 up to a predetermined limit due to the friction with the drive plate 14 and the holder 19 while being locked to the 14 and rotating integrally therewith.

The spring mechanism 12 is composed of a coil spring 27 held between two annular sub-plates 25 and 26 and accommodated in the annular space 17, and each of the sub-plates 25 and 26 has a coil spring 27 along the circumferential direction. Notch (hole) 25 that fits on the side of
Drive plate 1 with a and 26a formed at 5 locations
A retainer 28 and a bolt 29 are screwed and fixed in the vicinity of the outer peripheral edge of 4. Each coil spring 27 fitted in each notch 25a, 26a has an octagonal spring seat 30, 30 at each end.
Is disposed, one end surface of the spring seat 30 is fitted into the coil of the coil spring 27, and a cylinder 30a having a smaller diameter than the spring seat 30 is formed so as to project. An elastic body 30c made of rubber is fixed.

The damping / torque limit mechanism 13, as shown in FIG.
Arranged in the annular space 21, the structure is such that the hub plate 31 having the friction plates 33 fixed on both sides is pressed by the cone spring 32 arranged on the drive plate 14 side to the driven plate 18 side via the intermediate plate 34. Is what you are doing. In this hub plate 31, arms 31a extending outwardly in the annular space 17 in the radial direction are formed between coil springs 27, 27 arranged in the annular space 17 at equal intervals in the same direction. Both end surfaces 31b of the arm 31a are opposite surfaces of the spring seat 30.
The shape corresponds to the shape of 30d. Intermediate plate 3
A plurality of protrusions 34a are formed in the circumferential direction on the inner peripheral edge of the inner peripheral edge 4 in the radial direction.
Displacement in the circumferential direction is limited by engaging with the groove 19b formed on the 19 side.

Since the main driving part 9 and the driven part 10 are rotatable relative to each other, when torque fluctuation occurs in the crankshaft 2, they are relatively displaced and the rotational torque of the main driving part 9 is transmitted to the driven part 10 as follows. . That is, referring to the transfer torque characteristic diagram of FIG. 8, in the section AB, the coil spring 27 has the hub plate.
The arm 31a of 31 is not engaged, the free spring length is held, and torque is transmitted only through the hysteresis mechanism 11. That is, the spring mechanism 12 and the damping / torque limit mechanism 13
Does not act and the rotational torque fluctuation is transmitted only by the frictional force of the hysteresis mechanism 11. Therefore, the absolute value of the torque fluctuation is T
smaller than _q1 , drive plate 14 and driven plate
When the relative rotation angle of 18, that is, the absolute value of the twist angle of the flywheel 3 is smaller than the angle θ ₁ , the hysteresis mechanism 11
The slip does not occur, and such a minute torque fluctuation is not absorbed. Further, the main driving unit 9 and the driven unit 10 rotate relative to each other, the coil spring 27 comes into contact with the arm 31a of the hub plate 31 to start contraction, and the coil spring 27 in the section BC and AF where the friction plate 33 does not slip. The torque is transmitted according to the amount of contraction. Specifically, the spring seat 30 of the coil spring 27 of the spring mechanism 12 contacts the arm 31a of the hub plate 31 of the damping / torque limit mechanism 13 (point B),
Further, the coil spring 27 presses the arm 31a of the hub plate 31 while compressing and deforming, and transmits the rotational torque of the main drive portion 9 to the hub plate 31. At this time, since the hub plate 31 is pressed against the driven plate 18 and the intermediate plate 34 by the cone spring 32, the hub plate 31 and the driven portion 10 rotate integrally due to the frictional force, and as a result, the main driving portion is rotated. The rotation torque of 9 is transmitted to the driven portion 10. However, the flywheel 3 is twisted to the angle θ ₂ and the elastic bodies 30c come into contact with each other, the coil spring 27 reaches the compression deformation limit (point C), and further, the elastic body 30c is deformed, and the elastic body 30c and the coil spring 27. The elastic force of hub plate 3
When the maximum frictional force of 1 is reached (point D), the pressure contact surfaces of the hub plate 31, the driven plate 18 and the intermediate plate 34 begin to slide, and the rotational torque of T _q2 or more from the main drive part 9 is driven.
Therefore, the torque fluctuation larger than the maximum frictional force is not transmitted to the output side of the flywheel 3, and the rotation fluctuation thereof is restricted.

These characteristics draw a hysteresis loop due to the action of the hysteresis mechanism 11, and the limit of the rotational torque that can be transmitted is the spring force of the cone spring 32 and the friction plate.
It can be arbitrarily set by selecting the contact area of 33 or the like.

(Problems to be solved by the invention) However, in the above-described conventional torque fluctuation absorber, when the wear of the friction plate 33 of the damping / torque limit mechanism 13 progresses beyond the allowable value, the maximum torque amount T _q2 that can be transmitted decreases. However, there is a problem in that the driving torque of the wheels may decrease and it may be difficult to travel.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a torque fluctuation absorbing device capable of preventing a decrease in transmission torque due to a time-dependent factor such as wear of a friction plate.

(Means for Solving the Problem) In order to achieve the above object, according to the present invention, a first torsion spring that is compressively attached to either one of a main drive plate and a driven plate that can rotate relative to the main drive plate. And a friction plate which is frictionally engaged with the other of the main driving plate and the driven plate and is rotatable relative to the other, and which is engageable with the first torsion spring. After the relative rotation of the driven plate and the driven plate, the friction plate is locked to the first torsion spring to compress the first torsion spring, and then the friction plate is attached to either the main driving plate or the driven plate. In a torque fluctuation absorbing device that relatively rotates relative to each other to perform torque transmission between the main driving plate and the driven plate, stopper means for restricting relative rotation of the friction plate to either the main driving plate or the driven plate. Take A second torsion spring is interposed between the stopper means and the friction plate.

(Operation) When the rotational torque transmitted from the main driving plate to the driven plate through the first torsion spring reaches the maximum frictional force of the friction plate, the friction engagement surface of the friction plate slides, which causes the main driving plate and the driven plate to move. Rotate relative to either of the other plates. Therefore, the second
The torsion spring is pressed by the friction plate, and the rotational torque is transmitted from the main driving plate to the driven plate according to the amount of compressive deformation.

Further, when the friction plate relatively rotates and the compression deformation amount of the second torsion spring reaches a predetermined value, the stopper means regulates the relative rotation angle of the friction plate, so that the friction plate can rotate further. There is no.

Embodiment An embodiment of the present invention will be described in detail below with reference to the accompanying drawings.
Incidentally, the same or corresponding members as those shown in FIGS. 5 to 7 are designated by the same or corresponding reference numerals, and their detailed description will be omitted.

1 to 3 are flywheels 3'of a dry single-plate friction clutch to which the torque fluctuation absorbing device according to the present invention is applied.
The torque fluctuation absorbing device interposed between the main driving part 9 and the driven part 10 is the conventional torque fluctuation absorbing device shown in FIGS. 5 to 7 with the spring mechanism 40 and the stopper means 41 added. is there.

The first spring mechanism 12 is arranged in the annular space 21 and is attached to the main driving portion 9 side, while the second spring mechanism 40 is attached to the driven portion 10 side (FIG. 2). More specifically, the second coil spring 42 accommodated in the annular space 21.
Is fitted in a recess 18'b formed on the surface of the driven plate 18 'facing the annular space 21 and a notch (hole) 34'a formed on the surface of the intermediate plate 34' facing the driven plate 18 '. Being held by these. Also, the hub plate 31 '
Also, at the positions corresponding to the second coil springs 42 of the friction plates 33 '(hereinafter referred to as hub plates 31' etc.) fixed to both sides thereof, notches (holes) 31'c, 33 'which are long in the circumferential direction. a is formed in the same shape. These notches 31'c, 33'a
The length in the circumferential direction is longer than the free spring length of the second coil spring 42. That is, the hub plate
After each of 31 'and the like slides relative to the driven plate 18' and the intermediate plate 34 'by a predetermined angle and relatively rotates, each notch
The end surfaces of 31'c and 33'a are in contact with the end surface of the second coil spring 42.

The stopper means 41, as shown in FIG.
The relative rotation amount of the driven plate 18 ', the hub plate 31', etc. is regulated by 43, and more specifically, the stopper pins 43 are fitted to predetermined positions of the driven plate 18 'and the intermediate plate 34', respectively. The holes 18'c, 34'b are formed, and the holes 18'c, 34'b of the hub plate 31 'and the like are formed.
Long holes 31'd, 33 'in the circumferential direction are provided at positions corresponding to 34'b.
b are formed in the same shape (see FIG. 1). The circumferential lengths of the long holes 31'd, 33'b are set to respective values after the hub plate 31 'is rotated by a predetermined angle relative to the driven plate 18' while compressing and deforming the second coil spring 42. The lengths of the end faces of the long holes 31'd, 33'b are set so as to abut the stopper pin 43. At this time, the stopper pin 43 and the long hole
The distance between one end surface 31'e, 33'c of 31'd, 33'b is set larger than that between the stopper pin 43 and the other end surface 31'f, 33'd. 3'when a torque in the positive direction (direction transmitted from the main driving part 9 to the driven part 10) acts, and a case where torque in the negative direction (direction transmitted from the driven part 10 to the main driving part 9) acts In, the regulated relative rotation angles are set to be different.

A snap ring 44 is fitted on the tip of the stopper pin 43, and the driven plate 18 'of the stopper pin 43 is fitted.
Etc. are prevented from falling off.

The operation will be described below.

FIG. 4 shows a transmission torque characteristic diagram of the torque fluctuation absorbing device. In the section A′B ′, only the hysteresis mechanism 11 is used, and in the sections B′C ′ and A′F ′, the first spring mechanism is additionally provided. Through section 12, in the section C'D ', GH, further spring seat 3
Rotational torque is transmitted also through the elastic body 30c of 0, and at points D'and H, the respective elastic forces of the first coil spring 27 and the elastic body 30c reach the maximum frictional force of the hub plate 31 'and the like. The pressure contact surface between 31 'and the like and driven plate 18' begins to slip.

'When twisted until the angle theta ₃ or - [theta] _5, hub plate 31' hub plate 31 'or the like and driven plate 18' and flywheel 3 relative rotation of such notch 31'C, of the 33'a Each end surface contacts the end surface of the second coil spring 42 (points E ', J), and the second coil spring 42 presses the driven plate 18' and the intermediate plate 34 'while compressing and deforming. Therefore, in the sections E'K and JM, the rotational torque of the hub plate 31 'and the like is transmitted via the second coil spring 42 according to the amount of compressive deformation of the driven plate 18'.
And to the intermediate plate 34 '. That is, the rotational torque of the main driving portion 9 is transmitted to the driven portion 10 via the second coil spring 42.

Then, the second coil spring 42 is further compressed and deformed, so that the relative rotation amount of the flywheel 3'is an angle θ in the positive direction.
₄ or when the angle -θ ₆ is reached in the negative direction, the stopper pins are attached to the respective end faces 31'e, 33'c or 31'f, 33'd of the long holes 31'd, 33'b such as the hub plate 31 '. 43 abuts (K, M
After that, the main driving part 9 and the driven part 10 rotate integrally with each other, and the rotational torque is transmitted between them via the stopper pin 43.

Thus, when the relative rotation angle between the main driving portion 9 and the driven portion 10 becomes equal to or greater than the predetermined value, that is, the stopper pin 43 is moved to the hub plate 3
When the driving part 9 and the driven part 10 start to rotate integrally with each other due to collision with 1 ', etc., all of the drive torque input to one of the driving part 9 and the driven part 10 is transmitted to the other, and the friction plate The transmission torque does not decrease due to wear of the.
Further, since the coil spring 42 is compressed and deformed before the stopper pin 43 collides with the hub plate 31 'and the like, the collision shock is alleviated.

The angles (θ ₄ −θ ₃ ) and (θ ₆ −θ ₅ ) can be arbitrarily set by adjusting the circumferential lengths of the long holes 31′d and 33′b.

(Effect of the Invention) As described above, according to the present invention, the stopper means for restricting the relative rotation of the friction plate is attached to the other of the driving plate and the driven plate, and between the stopper means and the friction plate. Second
Since the torsion spring is installed, it is possible to prevent a decrease in the transmission torque due to a time-dependent factor such as wear of the friction plate, and to improve running stability.

[Brief description of drawings]

FIG. 1 is a partially cutaway plan view showing an embodiment of a flywheel of a clutch to which a torque fluctuation absorbing device according to the present invention is applied, FIG. 2 is a sectional view taken along the line II-II in FIG. FIG. 3 is a sectional view taken along the line III-III in FIG. 1, FIG. 4 is a transmission torque characteristic diagram of the first torque fluctuation absorbing device, and FIG. 5 is a fly of a clutch to which the conventional torque fluctuation absorbing device is applied. A sectional view of the wheel, FIG. 6 is a partially cutaway plan view of FIG. 5, and FIG.
FIG. 8 is an enlarged detailed view of circle VII in FIG. 5, and FIG. 8 is a transfer torque characteristic diagram of the torque fluctuation absorbing device in FIG. 3 '... flywheel, 9 ... main driving part, 10 ... driven part, 12 ... first spring mechanism, 17,21 ... annular space, 31 ...
... hub plate, 40 ... second spring mechanism, 41 ... stopper means.

Claims (1)

[Scope of utility model registration request] 1. A first torsion spring compressively attached to either one of a main drive plate and a driven plate which is rotatable relative to the main drive plate and frictionally engages with the other one of the main drive plate and the follower plate. And a friction plate which is arranged so as to be rotatable relative to them and which can be locked to the first torsion spring. When the main drive plate and the driven plate rotate relative to each other, the friction plate moves to the first torsion plate. The first to be locked to the spring
After compressing the torsion spring, the torque fluctuation absorbing device for rotating the friction plate relative to the other of the driving plate and the driven plate to transmit torque between the driving plate and the driven plate, A stopper means for restricting relative rotation of the friction plate is attached to the other of the main drive plate and the driven plate, and a second stopper is provided between the stopper means and the friction plate.
Torque fluctuation absorbing device, characterized in that a torsion spring is installed.