JP3058703B2 - Flywheel - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flywheel mounted on an end of a crankshaft.

[0002]

2. Description of the Related Art A flywheel of this kind reduces the rotational fluctuation of the crankshaft caused by the fluctuation of the engine torque and attenuates the torsional vibration of the crankshaft so that the power can be smoothly transmitted to the output shaft via the clutch. Various ideas have been applied.

For example, in a flywheel disclosed in Japanese Utility Model Laid-Open Publication No. 61-160343, a mass body (inertia body) is divided, and the divided mass bodies are connected with a centrifugal clutch and connected with a torsion damper. When the engine (crankshaft) rotation speed is equal to or lower than a predetermined rotation speed, the divided mass bodies are integrally connected by a centrifugal clutch to improve the startability of the engine, while the engine rotation speed is equal to or higher than the predetermined rotation speed. When the centrifugal force is applied, the centrifugal clutch is disengaged, and the divided mass bodies are connected only with the torsional damper.
The engine torque fluctuations and the torsional vibrations of the crankshaft accompanying the fluctuations are effectively absorbed and damped.

[0004]

However, as shown in FIG. 8, the above-mentioned conventional flywheel is provided with a spring 52 in a concave portion 51 formed in one of the mass bodies 50 in a radially inward direction (a lower portion in FIG. 8). ), The friction plate 54 fixed to the centrifugal clutch 53 is frictionally engaged with the outer peripheral portion 56 of the other mass body 55 when the engine speed is equal to or lower than a predetermined speed. Let the mass body 50, 55
When the engine rotation speed is equal to or higher than a predetermined rotation speed while rotating them together, the centrifugal force acting on the centrifugal clutch 53 becomes larger than the spring force, and the centrifugal clutch 53 moves radially outward (upward in FIG. 8). Since the slide between the mass bodies 50 and 55 is released, the friction plates 54
It has been pointed out that there is a possibility that the abrasion dust of the centrifugal clutch 53 may enter between the centrifugal clutch 53 and the wall surface of the concave portion 51 and cause malfunction of the centrifugal clutch 53.

Accordingly, an object of the present invention is to provide a flywheel capable of solving such a conventional problem.

[0006]

That is, according to the present invention, a mass body is disposed so as to face the axial direction of a crankshaft, and one of the mass bodies is fixed to the crankshaft. the body and the other masses as well as cooperative with torsional damper, a surface <br/> you facing these two flywheel made in tandem with a centrifugal clutch, the centrifugal clutch, one or From one end attached to the mass, pass through the gap between the axial end faces of both masses.
Extending radially outward, and a centrifugal force acting part
And the centrifugal force acting on the centrifugal force acting part
Flexing in the direction away from the other mass body
A clutch plate provided with a section and a clutch plate fixed to the clutch plate, and the plate is changed in the direction of the other mass body.
Frictional engagement with the axial end surface of the other mass body
Between the rubbing plate and the one mass body and the clutch plate.
And a disc spring that presses the friction plate against the other mass body via the clutch plate.

[0007]

When the engine (crankshaft) speed is less than a predetermined speed, the friction plate fixed to the clutch plate
The spring force of the disc spring frictionally engages the axial end face of the other mass body. Thereby, one mass body and the other mass body are connected by the centrifugal clutch and rotate integrally.

[0008] When the engine (crankshaft) rotational speed is equal to or greater than a predetermined rotational speed, the centrifugal force acting on the clutch plate is increased, the other flexible portion of the clutch plate against the spring force of the disc spring <br/> Of the mass body in a direction away from the axial end face . Thereby, the frictional engagement between the friction plate and the other mass body is released (the centrifugal clutch is disengaged), and the one mass body and the other mass body are linked by the torsion damper and rotate.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a sectional view showing a mounted state of a flywheel 1 according to an embodiment of the present invention. In this figure, reference numeral 2 denotes a crankshaft. A first mass body 3 is fixed to a shaft end of the crankshaft 2 together with a reinforcement plate 4 by bolts 5. The first mass body 3 includes a substantially disk-shaped elastic plate 6 and a ring gear portion 7 fixed to the outer peripheral end of the elastic plate 6. The ring gear 7 is formed with a ring gear that meshes with a pinion gear of a starter motor (not shown).

Reference numeral 8 denotes a torsional damper. The torsion damper 8 forms a working chamber 9, an input member 11 having an outer peripheral end fixed to a side surface of the elastic plate 6 of the first mass body 3 with a rivet 10, and a predetermined angle between the input member 11 and the working chamber 9 of the input member 11. An output member 12 engaged in a relatively rotatable manner, a spring member 13 elastically connecting the input member 11 and the output member 12 in a relatively rotatable manner, an input member 11 and an output member 12
And the frictional force generating means 14 interposed between the input member 11 and the inner peripheral end of the input member 11 is closed with seals 15 and 16,
A viscous fluid having a lubricating function is sealed inside the working chamber 9.

The input member 11 includes a pair of drive plates 1 to which annular sub-plates 17 and 18 are fixed.
9 and 20 are arranged facing each other, and these drive plates 1
9 and 20 are integrated by a stop pin 21 and the outer peripheral ends of these drive plates 19 and 20 are
It is fixed by caulking. A plurality of windows 22 for accommodating the spring members 13 are formed in the sub-plates 17 and 18 in the circumferential direction.

On the other hand, the output member 12 has a plate portion 23 formed so that a predetermined gap is formed between the output member 12 and the sub-plates 17 and 18 of the input member 11. Thereby, when the output member 12 and the input member 11 rotate relative to each other, the plate portion 23
The viscous resistance of the fluid is generated in the gap between the fluid and the sub-plates 17 and 18.

The plate 23 of the output member 12 includes
A stopper groove 24 that engages with the stop pin 21 is formed so that when the relative rotation with respect to the input member 11 is performed by a predetermined angle, the relative rotation between the input member 11 and the input member 11 is stopped.

Further, a spring accommodating portion 25 corresponding to the window 22 formed on the sub-plates 17 and 18 is formed in the plate portion 23 of the output member 12.
By accommodating the spring member 13, the output member 12 and the input member 11 are elastically connected to each other in the rotation direction.

In addition, a boss 26 is formed on the inner peripheral end of the output member 12, and the boss 26 is rotatably supported by a bearing 27 attached to the reinforce plate 4. A substantially disk-shaped second mass body 28 is fixed to the boss 26 of the output member 12 with bolts 29.

The frictional force generating means 14 is interposed between the drive plate 19 of the input member 11 and the boss 26 of the output member 12, and comprises a friction plate 30, a retainer 31, and a disc spring 32. 11 and the output member 12 are prevented from rattling in the axial direction.
1 and the output member 12 when the drive plate 19
And the friction plate 30 are in sliding contact with each other to generate frictional resistance.

A centrifugal clutch 33 connects the axial end face 34 of the first mass body 3 and the axial end face 35 of the second mass body 28 facing the same. This centrifugal clutch 33 is
The clutch plate 36 attached to the axial end surface 35 of the mass body 28, a friction plate 37 fixed to the clutch plate 36 to press the friction plates 37 on the end face 34 of the first mass body 3 via the clutch plate 36 dishes And a spring 38.

Of these, the clutch plate 36 is
A lower end 39 fixed to the mass body 28 and a gap 40 between the first mass body 3 and the second mass body 28, and from the lower end 39 to the outside of the mass bodies 3 and 28 (upward in FIG. 1). The centrifugal force acting portion 43 includes a bent flexible portion 41 that extends and a centrifugal force acting portion 43 having a weight 42 and located outside the mass bodies 3 and 28 (see FIG. 2). When a centrifugal force acts on 43, the friction plate 37 bends and deforms away from the side surface 34 of the first mass body 3. Note that a plurality of clutch plates 36 are arranged in the circumferential direction of the side surface 35 of the second mass body 28.

On the other hand, the disc spring 38 (see FIG. 3)
When the rotation speed of the second mass body 28 is greater than or equal to a predetermined rotation speed and the centrifugal force acting on the centrifugal force acting portion 43 is greater than or equal to a predetermined value, It is configured to be deformed by being pushed by the clutch plate 36.

Since the deformation of the clutch plate 36 of the centrifugal clutch 33 can be restricted by the outer peripheral end of the end surface of the second mass body 28, the disc spring 38 and the clutch plate 36
No excessive stress is generated.

45 is a second mass body 28 of the flywheel 1
The clutch disk 45 has a clutch facing 46 that frictionally engages with the clutch disk 45. The clutch disk 45 is spline-fitted to the output shaft 47. Reference numeral 48 denotes a clutch cover assembly attached to the second mass body 28.

According to the structure of the above embodiment, when the engine is started, the first mass body 3 and the second mass body 28 are connected to the centrifugal clutch 33.
Therefore, when a starter motor (not shown) is started, the two rotate integrally. Therefore, the turning power of the starter motor is transmitted to the crankshaft 2 through the flywheel 1 without waste, and the engine can be started easily.

When the engine speed is equal to or less than a predetermined speed,
The first mass body 3 and the second mass body 28 are linked by a centrifugal clutch 33 and rotate integrally, thereby absorbing a torque fluctuation of the engine without operating the torsional damper 8.

When the engine speed exceeds a predetermined speed, the centrifugal force acting on the clutch plate 36 increases, and the clutch plate 36 separates from the end face 34 of the first mass body 3 against the spring force of the disc spring 38. And the frictional engagement between the friction plate 37 and the first mass body 3 is released (the centrifugal clutch 33 is disengaged), and the first mass body 3 and the second mass body 28 are connected by the torsion damper 8. To rotate. Therefore, the flywheel 1 acts not only on its inertia but also on the torsional vibration damping function of the torsional damper 8 to absorb the torque fluctuation of the engine and attenuate the torsional vibration of the crankshaft 2 so that the smooth torque can be obtained. Enable communication.

As described above, the flywheel 1 of the present embodiment
Since the friction plate 37 fixed to the clutch plate 36 of the centrifugal clutch 33 is frictionally engaged with the end surface 34 of the first mass body 3, the wear powder of the friction plate 37 is removed from the flywheel 1 by centrifugal force. And the operation of the centrifugal clutch 33 is not hindered by the abrasion powder of the friction plate 37.

Incidentally, if the shape of the centrifugal force acting portion 43 of the clutch plate 36 is a blade shape as shown in FIG.
During the rotation of the mass body 28, the centrifugal force acting portion 43 can generate forced convection around the flywheel 1,
By the forced convection, the flywheel 1 and the like can be effectively cooled.

FIG. 5 shows an application example of the embodiment of FIG. 1, in which the shape of the clutch plate 36 is devised. That is, in the clutch plate 36 of this application example, the bent flexible portion 41 is directly extended upward in the figure, and the weight 42 is fixed to the upper end side surface to form the centrifugal force acting portion 43.

It should be noted that the centrifugal clutch 33 may be constructed in a manner opposite to that of the embodiment and the application. That is, as shown in FIGS. 6 and 7, the lower end 39 of the clutch plate 36 is fixed to the end face of the first mass body 3, the friction plate 37 is engaged with the end face 35 of the second mass body 28, The member 38 may be engaged with the outer peripheral step 44 of the first mass body 3.

[0030]

As described above, the flywheel according to the present invention has a clutch between the opposing axial end faces of both mass bodies.
Extend the clutch plate and apply friction to this clutch plate.
Fix the plate and adjust the centrifugal force
The friction plate by the deflection deformation of the
Abrasion powder on the friction plate can be discharged to the outside of the flywheel by centrifugal force to contact and separate from the axial end face ,
Since there is no the working of the centrifugal clutch is prevented by abrasion powder of the friction plate, centrifugal clutch operate reliably, reliability of the flywheel is further improved. In addition,
Ming's flywheel has a friction plate
Because the spring is urged, the centrifugal force acting part
When the working centrifugal force exceeds the set value, remove the friction plate
Can be reliably separated from the end face of the mass body
Therefore, the state of the so-called half clutch is reduced to reduce friction of the friction plate.
Wear can be suppressed. That is, due to the characteristics of the disc spring,
When the load acting on the spring exceeds a certain value, the input load
The displacement of the coned disc spring suddenly increased, at which point
Make sure the friction plate is separated from the end face of the other
It is possible to switch to the switch-off state. In addition, the book
The invention is directed to a counter plate through a clutch plate having a flexible portion.
The friction plate is pressed with a spring, so the axial
While forming the clutch plate along the gap,
The spring can be made compact and the spring
Since the centrifugal force acting part is not directly attached to the
The properties of the spring can be set easily and accurately.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating a main part of a flywheel according to an embodiment of the present invention.

FIG. 2 is a perspective view of a clutch plate.

FIG. 3 is a side view of the annular spring member.

FIG. 4 is a perspective view showing another embodiment of the clutch plate.

FIG. 5 is a sectional view showing an application example of the flywheel of FIG. 1;

FIG. 6 is a cross-sectional view illustrating a main part of a flywheel according to another embodiment of the present invention, in a state where the flywheel is mounted.

FIG. 7 is a sectional view showing an application example of the flywheel shown in FIG. 6;

FIG. 8 is an enlarged sectional view of a main part of a conventional flywheel.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Flywheel 2 ... Crankshaft 3 ... Mass body (1st mass body) 8 ... Torsional damper 28 ... Mass body (2nd mass body) 33 ... Centrifugal clutch 34, 35 ... Axial end face 36 ... Clutch plate 37 ... Friction plate 38: Disc spring

Continuation of the front page (56) References JP-A-60-109635 (JP, A) German Patent Application Publication 3823384 (DE, A1) (58) Fields investigated (Int. Cl. ⁷ , DB name) F16F 15 / 31

Claims (1)

(57) [Claims] 1. A mass body is arranged facing an axial direction of a crankshaft, one of the mass bodies is fixed to a crankshaft, and the one mass body and the other mass body are torsionally connected.・ Along with connecting with a damper,
The opposite to that surface thereof both a flywheel made in tandem with a centrifugal clutch, through the gap between the axial end faces of both masses the centrifugal clutch, the one end attached to one of the mass hand
It extends radially outward and has a centrifugal force acting part at the other end.
And the centrifugal force acting on this centrifugal force acting part
The flexible part that bends and deforms in the direction away from the other mass body
The clutch plate provided is fixed to this clutch plate, and the displacement of the plate in the direction of the other mass body
Therefore, the friction plate frictionally engages with the axial end surface of the other mass body.
Interposed between the one mass body and the clutch plate.
And a disc spring for pressing the friction plate against the other mass body via the clutch plate.