JPH0631228Y2 - Damper disk - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention is a damper disk in which two torsion springs are arranged in series in one torsion spring arranging window, and a float body is arranged between the torsion springs. Regarding

(Prior Art and Problems Thereof) In this type of damper disk, a float body made of iron has been conventionally used. However, the movement of the float body rubs the periphery of the window hole and the float body, adding to the originally required hysteresis torque,
Unstable hysteresis torque is added by fretting, etc., and since the float is made of iron and heavy, the centrifugal force during rotation increases the force of the float to press the peripheral edge of the window hole, further increasing the hysteresis torque.
It is an obstacle to the prevention of abnormal noise while driving.

(Object of the Invention) The object of the present invention is to secure a wide twist angle to prevent abnormal noise such as muffled noise during traveling, to minimize friction between the float body and the window hole, and It is to reduce the weight.

(Technical Means for Achieving the Object) In order to achieve the above object, the invention of the present application forms a pair of input side plates and an output side plate between the side plates with torsion spring arranging windows. At least two torsion springs are arranged in series in the same window hole, and the side plate and the output side plate are connected by the torsion spring so that torque can be transmitted.
Between the individual torsion springs, a trapezoid whose width in the circumferential direction becomes narrower toward the center of the clutch and a float body movable in the circumferential direction is interposed, and the float body has a low friction coefficient. It is made of a light plastic material, and a pair of inverted triangular metal plate guide plates are fixed to both axial end faces of the float body so that the float body is sandwiched and the apex portion projects toward the clutch center side. The circumferential end surface of the guide plate is aligned with the circumferential end surface of the float so that the end surface of the guide plate and the end surface of the float body abut and support the circumferential end surface of the spring.

(Operation) By twisting the input side plate with respect to the output side plate during traveling, two series torsion springs arranged in the same window hole are compressed. At the same time, the float body between the torsion springs moves in the circumferential direction, but since it is made of resin with a low coefficient of friction, even if it contacts the outer peripheral edge of the window hole in the radial direction, the fretting will hardly occur. It never happens. Further, since it is light, the centrifugal force at the time of rotation is small, and accordingly, the hysteresis torque which is unstable more than necessary does not increase depending on the movement of the float body.

Further, a pair of inverted triangular sheet metal guide plates are fixed to both axial end faces of the float body so as to sandwich it, and a spring is received at the circumferential end face of the guide plate and the axial end face of the float body. Therefore, high strength can be maintained.

(Embodiment) FIG. 3 shows an example in which the present invention is applied to a so-called separated hub type damper disk, in which a pair of input side plates 1 are arranged at regular intervals in the axial direction. The peripheral edges are joined by rivets 2. The cushioning plate 4 is fixed to the outer peripheral end of the side plate by the rivets 2, and the input facings 3 are fixed to both sides of the cushioning plate 4. The input facing 3 is sandwiched between, for example, a flywheel and a pressure plate, and a rotational force is input.

A pair of annular intermediate plates (an example of output side plates) 6 are arranged between both side plates 1. The intermediate plates 6 are formed thick and overlap each other, and are integrally connected by rivets 7. ing. A plurality of expanding portions 6a that open in the axial direction are formed in the inner peripheral end portion of the intermediate plate 6. The flange 11 of the output side hub 10 is arranged in the expanding portion 6a, and the output side hub 10 is spline-fitted to the output shaft, for example.

A second-stage friction member 13 having a large friction coefficient is arranged between the inner peripheral side portion of the intermediate plate 6 and the inner peripheral side portion of the side plate 1, and the inner peripheral side portion of the intermediate plate 6 and the flange 11 are disposed.
A first-stage friction member 12 having a small friction coefficient is arranged between them.

The flange 11 is formed with a window hole (notch) 16 for the first-stage spring, and the expanding portion 6a of the intermediate plate 6 is correspondingly formed.
A first window hole 17 is formed therein, and a first-stage torsion spring 21 having a small spring constant is arranged in the window holes 16 and 17 so as to be circumferentially compressible. That is, both ends of the first-stage torsion spring 21 abut on the circumferential edge of the window hole 16 of the flange 11 via the spring bearing 22, and the spring bearing 2
2 extends in both axial directions, and the first window hole 17 of the intermediate plate 6
Abuts on the circumferential edge of the.

2 is a sectional view of a portion different from that of FIG. 3 (II-II in FIG. 1)
FIG. 2 is a sectional view, and in FIG.
A second window hole 18 is formed in an outer peripheral side portion of the side plate 1. A window hole 19 is formed in the side plate 1 so as to correspond to the second window hole 18, and the second stage is formed in the window holes 18 and 19. The torsion spring 23 is arranged so as to be circumferentially compressible.

In FIG. 1, three second window holes 18 are formed at equal intervals in the circumferential direction, and two second-stage torsion springs 23 are serially arranged in the circumferential direction in the window hole 18. The two second-stage torsion springs 2 in one window hole 18
A float body 25 is interposed between the three so as to be movable in the circumferential direction. The second-stage torsion spring 23 is of a parent-child spring type and has a child coil spring 27 inside.

The window holes 16 of the flange 11 are also formed in three places at intervals in the circumferential direction, and the recesses 30 are formed in the portions between the window holes of the flange 11, while the intermediate plate 6 is formed in the recesses 30. A projecting convex portion 32 is formed, and a circumferential gap d ₁ between the concave portion 30 and the convex portion 32 regulates the torsion angle range of the first step. That is, the concave portion 30 and the convex portion 32 constitute a stopper mechanism for direct torque coupling.

According to the present invention, the float body 25 is made of a hard resin having a low coefficient of friction such as polyamide resin, is light in weight, is formed in a trapezoidal shape that becomes thinner toward the center side of the clutch, and has a radial outer peripheral edge 25c. The two window holes 18 are in contact with the radially outer end edge 18c. As shown in FIG. 5, a guide plate 35 is fixed to both side surfaces of the float body 25 in the axial direction by pins 36, and both ends of the guide plate 35 on the outer side and the inner side in the radial direction are both sides of the intermediate plate 6. It extends to the surface portion, thereby preventing the float body 25 from falling off in the axial direction.

As shown in FIG. 4, the guide plate 35 is formed in a substantially inverted triangular shape, and the spring bearing surface with which the torsion spring abuts is flush with the spring bearing surface M of the float body 25. Further, an extension 35a extending in both the circumferential direction is formed at the radially outer end of the guide plate 35. As the material of the guide plate 35, for example, an iron plate is used, which improves the strength against the spring pressure. The pin 36 is also made of metal.

Next, the operation will be described. At the time of idling, the intermediate plate 6 and the side plate 1 are integrally twisted with respect to the flange 11 of FIG. 1 in the same direction as the rotation direction R, and the first-stage torsion spring 21 is compressed. At this time, the first-stage friction member 12 between the intermediate plate 6 and the flange 11 in FIG. 2 rubs, so that a small hysteresis torque is generated.

When a low speed running is started from idling, the torsional torque increases, so that the concave portion 30 of the flange 11 of FIG.
And the protrusion 32 of the intermediate plate 6 come into contact with each other, and the flange 11
And the intermediate plate 6 are integrated with each other, and the side plate 1 starts to be twisted in the R direction with respect to them, and compresses the second-stage torsion spring 23. At this time, the second-stage friction member 13 between the side plate 1 and the intermediate plate 6 in FIG. 2 rubs, so that a relatively large hysteresis torque is generated.

Due to the compression of the second-stage torsion 23, the float body 25 of FIG. 1 also moves in the circumferential direction, and the radially outer peripheral edge 25c of the float body 25 and the outer edge 18c of the window hole 18 rub against each other. Since the body 25 itself is made of a polyamide resin having a low coefficient of friction, almost no flecking occurs, and because it is light, centrifugal force does not occur so much. Absent.

Figure 6 shows the torsional characteristic diagram, hysteresis torque in the torsion angle range 0～Shita ₁ of the first stage is suppressed extremely small, the torsional angle range of the second stage theta ₁ through? ₂ in a relatively large stable The generated hysteresis torque H is generated.

In addition, the second-stage torsion spring 23 shown in FIG.
By arranging two in series in 8,
The step twist angle range θ1 to θ2 is widened, whereby the muffled noise during low speed traveling can be effectively reduced.

At the maximum torsion angle θ ₂ , the second-stage torsion spring 23 is fully compressed.

(Effects of the Invention) According to the invention of the present application as described above; (1) A pair of input side plates 1 and an output side plate (intermediate plate 6) between the side plates, each having a torsion spring placement window hole 19, Since 18 is formed and at least two torsion springs 23 are arranged in series in the same window hole, a wide torsion angle characteristic can be obtained with relatively small rigidity, and abnormal noise such as muffled noise at low speed running can be obtained. Has a preventive effect.

(2) Since the float body 25 interposed between the two torsion springs 23 is made of a plastic material having a low friction coefficient and a light weight, the float body 25 is compressed when the torsion spring is compressed.
Even if it is in sliding contact with the edge of the window hole 18, fretting hardly occurs, and since it is light, the centrifugal force is small. . Therefore, there is no fear that the unstable hysteresis torque due to the movement of the float body 25 increases,
The above-mentioned effect of preventing abnormal noise can be favorably maintained.

(3) As an assembly of the float body 25, the float body 25 formed of a plastic material having a low friction coefficient and a light weight.
Is supported by an inverted triangular sheet metal guide plate 35 from both sides in the axial direction, and the end face in the circumferential direction of the guide plate 35 is the float body 25.
Since the end face of the guide plate 35 and the end face of the float body 25 contact and support the end face of the spring 23 in the circumferential direction in alignment with the end face of the float body 25, at the same time as reducing the weight of the assembly of the float body 25, It is possible to effectively reduce the fretting phenomenon with the inner peripheral edge of the window hole, and it is possible to maintain the compressive strength for supporting the spring 23 by the end face of the sheet metal guide plate 35 in the axial circumferential direction. .

(4) The shape of the sheet metal guide plates 35 fixed to both sides of the float body 25 in the axial direction is an inverted triangle with the apex protruding toward the center of the clutch, and the apex extends to both sides of the intermediate plate 6. Since it is extended and used as a guide surface for preventing falling off, the weight of the guide plate 35 itself can be reduced, and the area that rubs against the side surface of the intermediate plate 6 is small, so that the occurrence of fretting at this portion can be effectively prevented. .

[Brief description of drawings]

FIG. 1 is a side view showing a damper disk to which the present invention is applied by partially cutting away, FIG. 2 is a sectional view taken along line II-II of FIG. 1,
3 is a III-III sectional view of FIG. 1, FIG. 4 is an enlarged side view of the float body, FIG. 5 is a VV sectional view of FIG. 4, and FIG. 6 is a torsion characteristic diagram. 1 ... Side plate, 6 ... Intermediate plate (output side plate), 10 ... Hub, 11 ... Flange, 18 ... Window hole, 19
... Window hole, 23 ... Second stage torsion spring, 25 ... Float body, 35 ... Guide plate

Claims (1)

[Scope of utility model registration request] 1. A pair of input side plates and an output plate between the side plates are provided with torsion spring arranging window holes, and at least two torsion springs are arranged in series in the same window hole. A side plate and an output side plate are connected by a torsion spring so that torque can be transmitted, and a trapezoidal shape in which the width in the circumferential direction becomes narrower toward the clutch center side between two series of torsion springs in one window hole. And a float body that is movable in the circumferential direction are interposed, the float body is formed of a light plastic material having a low friction coefficient, and the float body is sandwiched between both axial end surfaces of the float body. And a pair of inverted triangle-shaped sheet metal guide plates with the apex protruding toward the center of the clutch are fixed, and the circumferential end faces of the guide plates are attached to the circumferential direction of the float. Damper disk, wherein a circumferential end of the spring at the end face of the end face of the guide plate aligned to the end surface and the float body and into contact support.