JPH0623790Y2 - 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) The 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 the 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. As shown in FIGS. 3 and 4, a dry single-plate friction clutch (hereinafter simply referred to as a clutch) 1 incorporating the torque fluctuation absorbing device has a flywheel 3 fixed to a crankshaft 2 and the flywheel 3 concerned. And a drive unit 5 composed of a clutch cover 4 that rotates integrally with the drive shaft, and an input shaft (hereinafter simply referred to as an input shaft) 6 of a transmission (not shown) that is interposed between the flywheel 3 and the clutch cover 4. It is composed of a driven part 7 such as a rotating clutch disk.

The flywheel 3 is a split flywheel that is divided into a main driving section 9 and a driven section 10, and is a thick inertia rotary body,
The rotational torque of the main drive unit 9 is transmitted to the driven unit 10 via the torque fluctuation absorbing device interposed between the main drive unit 9 and the driven unit 10, that is, the hysteresis mechanism 11, the spring mechanism 12, and the damping / torque limit mechanism 13. Transmitted. The driving part 9 is
The flywheel 3 includes a drive plate 14 located on the crankshaft 2 side and a retaining plate 15. The annular retaining plate 15 is formed on the outer peripheral edge of the drive plate 14 so as to project toward the clutch disc 7 side. An annular space 17 that opens radially inward is formed between the opposing surfaces of the drive plate 14 and the retaining plate 15 by being screwed and fixed to the peripheral wall 14 a with bolts 16.

The driven portion 10 is the clutch disc 7 of the flywheel 3.
It is composed of a driven plate 18 and a holder 19 located on the side, and both the driven plate 18 and the holder 19 are formed in an annular shape. An annular groove 18a in which the retaining plate 15 is loosely fitted is formed on the side surface of the driven portion 9 of the driven plate 18, while a peripheral wall 19a is formed on the inner peripheral edge of the holder 19 so as to project toward the driven plate 18 side. The driven plates 18 have their inner peripheral edges abutted against each other and are screwed and fixed by bolts 20 to form an annular space 21 between the facing surfaces of the driven plate 18 and the holder 19 and which is open outward in the radial direction.

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 respective 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 includes a friction plate 23 that frictionally engages between the main driving portion 9 and the driven portion 10.
Is fitted into an annular groove 24 formed in the vicinity of the inner peripheral edge of the wall surface of the holder 19 facing the drive plate 14, and is locked by the drive plate 14 to
The rotary torque of the main driving part 9 is transmitted to the driven part 10 up to a predetermined limit due to the friction between the drive plate 14 and the holder 19 while rotating integrally.

The spring mechanism 12 is composed of a coil spring 27 which is sandwiched between two annular sub-plates 25 and 26 and accommodated in the annular space 17 of the main drive section 9. Each of the sub-plates 25 and 26 has a circumferential direction. Notches (holes) 25a and 26a that fit on the side surfaces of the coil spring 27 are formed at several places, and are fixedly screwed to the side walls of the drive plate 14 and the retaining plate 15 with countersunk screws 28 and 29, respectively. Has been done. The coil springs 27 fitted in the notches 25a and 26a respectively have octagonal spring seats 3 at both ends.
0 and 30 are arranged, and the spring seat 30 is fitted and inserted into the coil of the coil spring 27 at one end face thereof.
A cylinder 30a having a diameter smaller than 0 has two plate-like protrusions 3 on the other end surface which divide the end surface into three along the thickness direction of the clutch 1.
0b and 30b are respectively formed so as to project. Furthermore, the cylinder 3
An elastic body 30c is fixed to the front end surface of 0a.

The damping / torque limit mechanism 13 is arranged in the annular space 21 of the driven portion 10, and has a configuration in which the cone spring 32 is sandwiched between the two annular hub plates 31 and 31, and further the driven hub plates 31 are driven. The annular friction plates 33 are fixed to the surfaces facing the plate 18 and the holder 19, respectively. This hub plate 31 has
Arms 31a extending in the annular space 17 respectively outward in the radial direction.
Are formed between the coil springs 27, 27 arranged in the annular space 17 at equal intervals in the same direction.
Both end surfaces 31b of a have a shape corresponding to the shape of the facing surface 30d of the spring seat 30. Then, the main driving unit 9 and the driven unit 10 rotate relative to each other, so that the spring seat 30 moves to each arm 31a.
When contacting the end surface 31b of the plate, the plate-like protrusions 30b, 30b
Guides the end surface 31b to the facing surface 30d of the spring seat 30 by sandwiching the end surface 31b of the arm 31a.

Since the main driving unit 9 and the driven unit 10 are rotatable relative to each other, when torque fluctuations occur in the crankshaft 2, they are relatively displaced and the rotational torque of the main driving unit 9 is transmitted to the driven unit 10 as follows. . That is, referring to the transmission torque characteristic diagram of FIG. 5, in the section AB, the coil spring 27 does not engage with the arm 31a of the hub plate 31, the spring length in the initial state is maintained, and the hysteresis mechanism 11 Torque is transmitted only via. That is, the spring mechanism 12 and the damping / torque limit mechanism 13 do not act, and the rotational torque fluctuation is transmitted only by the frictional force of the hysteresis mechanism 11. Therefore, when the absolute value of the torque fluctuation is smaller than T _q1 , slippage does not occur even in the hysteresis mechanism 11, and such minute torque fluctuation is not absorbed. Further, the main driving part 9 and the driven part 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 3 of the coil spring 27 of the spring mechanism 12
0 is the hub plate 31 of the damping / torque limit mechanism 13
Of the hub plate 31 while abutting on the arm 31a of the hub plate 31 (point B), and the coil spring 27 is compressed and deformed.
By pressing a, the rotational torque of the driving portion 9 is changed to the hub plate 3
1 to 31. At this time, since each hub plate 31 is pressed against the driven plate 18 and the holder 19 by the cone spring 32, the hub plates 31, 31 and the driven portion 10 rotate integrally due to the frictional force, and as a result, The rotation torque of the main driving portion 9 is transmitted to the driven portion 10. However, the elastic bodies 30c come into contact with each other and the coil spring 27 reaches the compression deformation limit (point C), and the elastic body 30c is further deformed so that the elastic force of the elastic body 30c and the coil spring 27 is the maximum of the hub plate 31. When the frictional force is reached (point D), the pressure contact surface between the hub plate 31, the driven plate 18 and the holder 19 starts to slide, and no more rotational torque is transmitted from the main driving portion 9 to the driven portion 10, and accordingly the input shaft 6 is transferred to the input shaft 6. Torque greater than the maximum frictional force is not transmitted, and rotation fluctuation of the input shaft is restricted.

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

(Problems to be solved by the invention) However, in the above-described conventional torque fluctuation absorbing device, the expansion and contraction of the coil spring due to the relative rotation of the main driving plate and the driven plate causes a sliding contact between the spring seat and the coil spring, which causes noise. However, there is a problem that the sliding contact surface is abraded.

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 in which a coil spring is not in direct sliding contact with a spring seat.

(Means for Solving the Problems) In order to achieve the above object, according to the present invention, a coil spring is locked to either one of a main drive plate and a driven plate which is rotatable relative to the main drive plate, and the other is attached to the other. Frictionally engages a friction plate relative to the friction plate, and the arm portion of the friction plate is brought into abutment engagement with the coil spring via a spring seat to transmit torque between the driving plate and the driven plate. In the torque fluctuation absorbing device, a columnar portion to be inserted into the coil spring is formed on the spring seat so as to project, and a bush is interposed between the coil spring and the spring seat, and the bush is formed on the inner circumference of the coil spring. And a cylindrical portion interposed between the cylindrical portion and the cylindrical portion, and a flange portion extending outward from the cylindrical portion interposed between the end surface of the coil spring and the spring seat. Also Of.

(Operation) Since the bush is interposed between the coil spring and the spring seat, the coil spring does not make direct sliding contact with the spring seat, and these sliding surfaces are protected.

Also, the columnar part of the spring seat is fitted into the coil spring,
The bush cylindrical portion is interposed between the inner circumference of the coil spring and the cylindrical portion of the spring seat, and the spring seat is positioned properly, so that the coil spring position is maintained at an appropriate position, and the target performance is reliably achieved. At the same time, abrasion of the sliding contact surface is prevented.

Embodiment An embodiment of the present invention will be described in detail below with reference to the accompanying drawings.
The torque fluctuation absorbing apparatus of the present invention is different from the conventional one in that the spring mechanism is different from the conventional one. Therefore, except for the spring mechanism, refer to the torque fluctuation absorbing apparatus shown in FIGS. 3 and 4 described above. Explain.

1 and 2 show a spring mechanism 12 'according to the present invention. The spring mechanism 12' includes a coil spring 27 and a spring seat 4.
0 and the bush 42. The spring seat 40 is formed in an octagonal shape, and has a cylindrical portion 40a having a diameter smaller than that of the spring seat 40 on one end surface and two end surfaces which divide the end surface into three along the thickness direction of the hub plate 31. The plate-like protrusions 40b, 40b are formed to protrude. Column part 40a
Has an elastic body 41 made of, for example, synthetic rubber on its tip surface.
Is fixed, and the tip end surface of the elastic body 41 is inclined,
When the coil spring 27 is compressed, the spring seats 40 at both ends are
The elastic bodies 41 of 40 are shaped so as to be in surface contact with each other. The plate-like protrusions 40b, 40b sandwich the arm of the hub plate (not shown) so that the spring seat 4
It guides so as to contact 0, and each plate-like protrusion 40
The shape of the end surface 40c of the spring seat 40 between b and 40b is formed in a shape corresponding to the shape of the end surface of the arm, for example, a vertical cross-sectional chevron shape.

The bush 42 interposed between the spring seat 40 and the coil spring 27 has a cylindrical shape with a flange 42a formed at one end. The bush 42 is formed of a member having abrasion resistance and impact resistance, for example, 6-6 nylon containing glass fiber, and the tip end surface of the flange 42a is brought into contact with one end surface of the spring seat 40 so that the bush 42 is not attached to the cylindrical portion 40a. Be fitted. Bush 4
The spring seat 40 fitted with 2 is the flange 42a of the bush 42.
Are brought into contact with the end surfaces of the coil springs 27, and are fitted and inserted into the end rings of the coil springs 27, respectively.

The operation will be described below.

Since the main driving portion and the driven portion of the clutch can rotate relative to each other, the coil spring 27 repeatedly contacts and separates from the arm of the hub plate via the spring seat 40, and at this time, the coil spring 27 repeatedly expands and contracts. The coil spring 27 is
At the time of expansion and contraction, the coil spring 27 slides on the outer circumference of the columnar portion 40a of the spring seat 40 that is inserted into the wire ring of the coil spring 27.
Since the bush 42 is interposed between the spring seat 40 and the coil spring 27, the spring seat 40 and the coil spring 2 are provided.
7 does not make direct sliding contact with the coil spring 27, and the hitting sound of the coil spring 27 is greatly suppressed, and the spring seat 40 and the coil spring 27 are
No wear due to sliding contact with

Since the torque fluctuation absorbing action of the torque fluctuation absorbing device in this embodiment can be easily inferred from the action of the conventional torque fluctuation absorbing device shown in FIGS. 3 and 4, the description thereof will be omitted.

(Effect of the Invention) As described above, according to the torque fluctuation absorbing apparatus of the present invention, since the bush is interposed between the coil spring and the spring seats arranged at both ends of the coil spring, noise is reduced. In particular, the reduction of this noise becomes remarkable at the time of idling where the torque fluctuation is remarkable. Further, since the coil spring slides smoothly, the coil spring can be uniformly expanded and contracted to obtain an appropriate pressing force,
Further, there are excellent effects such as prevention of wear of the spring seat and the coil spring.

[Brief description of drawings]

1 is a front view showing an embodiment of a spring mechanism of a torque fluctuation absorbing device according to the present invention, FIG. 2 is a partial sectional side view of FIG. 1, and FIG. 3 is a conventional torque fluctuation absorbing device. FIG. 4 is a partially cutaway sectional view of the clutch as seen from the arrow IV in FIG. 3, and FIG. 5 is a transmission torque characteristic diagram of the torque fluctuation absorbing device shown in FIGS. 3 and 4. 9 ... Main drive plate, 10 ... Follower plate, 12 '... Spring mechanism,
27 ... Coil spring, 31 ... Hub plate (friction plate), 31a ... Arm part, 40 ... Spring seat, 40a
...... Cylindrical portion, 40b ...... Plate-shaped protruding portion, 41 ...... Elastic body,
42 ... Bush.

Claims (1)

[Scope of utility model registration request] 1. A coil spring is engaged with either one of a main drive plate and a driven plate capable of rotating relative to the main drive plate, and a friction plate is frictionally engaged with the other so as to be rotatable relative thereto. A torque fluctuation absorbing device in which an arm portion is brought into contact with and locked to the coil spring via a spring seat to transmit torque between the main driving plate and the driven plate, wherein the coil spring is inserted into the spring seat. A columnar portion is formed so as to project, and a bush is interposed between the coil spring and the spring seat, and the bush is disposed between the inner periphery of the coil spring and the columnar portion, and the coil spring. A torque disguise absorption device, characterized in that it has a flange portion which is interposed between the end face and the spring seat and extends outward from the cylindrical portion.