JPH09166180A - Two-inlet type flywheel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify a spring member used for a friction type vibration damping device for a two-inlet type flywheel and to eliminate a high-cost disc spring. SOLUTION: In a friction type vibration damping device 6 arranged between a first and a second flywheel 2 and 3 of a two-inlet type flywheel 1, a spring to generate a friction force forms a ring spring 14 with a seat and the friction force is transmitted to the second fly wheel 3 through friction drive plate 13 and a buffer spring 7. The ring spring 14 with a seat is formed in such a manner that a approximate one full winding ring spring part curved in a wave-form manner in a winding direction is helically arranged in succession to a plate-form ring seat part, and elasticity is generated at the wave-form part.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a two-mass type flywheel having a friction type vibration damping device.

[0002]

2. Description of the Related Art As a conventional friction type vibration damping device for a two-mass type flywheel, there is one disclosed in Japanese Utility Model Publication No. 6-2054. This is provided between two flywheels, and as shown in FIG. 7, in the case where the rotation is transmitted from the pair of drive plates a ₁ and a ₂ to the driven plate b, the thrust of the driven plate b is A lining c is provided on both sides of the part b ₁ , and a thrust plate d is applied to one side of the lining c and pressure is applied by a disc spring e to frictionally connect the thrust plate d and the drive plate a ₂ to the thrust part b _1. There is. In this conventional device, the thrust plate d is necessary for transmitting the pressure of the disc spring e to the lining c and the thrust portion b ₁ , and if this is not the case, galling may occur at the contact surface with the disc spring e that makes a line contact. There is. Further, this disc spring has a large diameter and is expensive.

[0003]

SUMMARY OF THE INVENTION According to the present invention, the frictional vibration damping device portion of a two-mass flywheel can be manufactured inexpensively with no galling on the contact surface with the spring and with a small number of parts. An object is to obtain a member that can be used.

[0004]

[Means for Solving the Problems] One of the means for achieving the above object is as described in claim 1,
In a two-mass type flywheel in which a friction type vibration damping device is provided on an inner surface of a flywheel, and a buffer spring is interposed between a friction drive plate of the friction type vibration damping device and a second flywheel, the friction type vibration damping device. Includes a friction surface on the inner surface of the first flywheel, and a friction plate, a friction drive plate, a seat ring spring and a push plate that sequentially overlap the friction surface, and the seat ring spring has a flat ring seat portion of less than one turn. And a ring spring part of approximately one turn that is curved in a wavy shape in the winding direction.

[0005]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a two-mass type flywheel 1 according to the present invention.
Has a first flywheel 2 and a second flywheel 3, the first flywheel 2 is supported by a boss 4 via bearings 5, and the second flywheel 3 is fixed to the boss 4. A friction type vibration damping device 6 and two types of buffer springs 7 having strength and weakness are provided between the first flywheel 2 and the second flyhole 3.

A drive plate 2 ₁ , a ring gear 2 ₂ , a spring holding plate 2 _{3 and the} like, which are fixed to the crankshaft of the engine (not shown), are fixed to the first flywheel 2. The driven plate 4 ₁ is fixed to the boss 4, and the torque transmitted from the buffer spring 7 is transmitted to the boss 4 and further transmitted to the input shaft of a transmission (not shown) fitted to the spline 4 ₂ .

As shown in FIGS. 1 and 2, the friction type vibration damping device 6 has a first flywheel 2 incorporated therein as a part of its construction. The inner surface of the first flywheel 2 on the inner peripheral side is provided with a flat friction surface 8, a clearance groove 9, a cylindrical portion 10 and an inner peripheral portion 11, and the cylindrical portion 10 has a friction plate 12 made of a plastic material, A friction drive plate 13 made of steel and a ring spring 14 with a seat are sequentially fitted, and a pressing plate 15 is superposed in a state of pressing the ring spring 14 with a seat, and the pressing plate 15 is fixed to the inner peripheral portion 11 by a rivet 16.

3 and 4 show a ring spring 14 with a seat,
The seated ring spring 14 is a thin plate spirally shaped about 1.75.
It is wound only around the circumference, and is composed of a ring seat portion 17 and a ring spring portion 18, and when it is expanded, it is formed as a series as shown in FIG.

The ring seat portion 17 is flat and has a range of about 0.75 turns from the start end 17 ₁ to the end end 17 _{2 in the} counterclockwise direction in FIG. 3, and the ring spring portion 18 changes its height in a wave shape. With the end 17 ₂ being the starting end, four peaks 18 ₁ and troughs 18 ₂ are alternately formed to reach the end 18 ₃ in a range of about 1 turn, and each trough 18 _{2 in the} free state. Contacts the ring seat 17.

The dimensions of each part of the seated ring spring 14 are, for example, diameter D = 112 mm, plate width W = 8 mm, and plate thickness T =.
The height of the ridge is 1.8 mm and the height H is 3 mm. The coil-shaped silicon chrome steel is rolled and cut, and a predetermined portion is deformed into a corrugated shape and heat-treated. Made of nitriding steel plate.

The seated ring spring 14 has a ring seat portion 17
Is brought into contact with the friction drive plate 13, and the ring spring portion 18 is pushed by the push plate 15 to hold the mountain portion 18 ₁ in a slightly compressed state.

When the oscillating rotation is transmitted from the engine to the first flywheel 2, the friction type vibration damping device 6 absorbs a part of the vibration and transmits the torque from the first flywheel 2 to the friction drive plate 13. . In this case, among the respective contact portions of the device 6, the friction surface 8 and the friction plate 12, the friction plate 12
The friction drive plate 13, the ring spring portion 18, and the pressing plate 15 slide against each other, and the sliding energy absorbs vibration energy.

FIG. 6 shows the relationship between the set height of the spring portion and the friction torque when an experiment was carried out using the ring spring with seat 14 of the present invention made in four types of specifications and the conventional disc spring. The horizontal axis shows the difference mm between the design value of the set height and the set height of the product, and the vertical axis shows the measured friction torque kgf.
When m is taken, the disc spring has a large diameter compared to the width, so that the elastic force changes little and generates a substantially constant predetermined friction torque as shown by the curve A. In the seated ring spring 14, the curve changes depending on the specifications, and when the set height is lower than the design value, the friction torque increases sharply. However, there is little change when the set height is high, and there is little difference in friction torque in the range of 0 to +0.5 mm, so there is no practical problem.

In the above embodiment, the ring spring portion 1
8 has four ridges 18 ₁ provided, but any number of 3 or more such as 3 to 9 can be provided, and the ratio of the ring seat 17 to the circle is 0.75 or more. It may be close to 1 in a large amount.

[0015]

According to the first aspect of the invention, in the ring spring with a seat in the friction type vibration damping device, the ring seat portion makes wide surface contact, and the ring spring portion makes surface contact at the plurality of peak portions, so that the contact surface is It is possible to reduce the number of parts of the two-mass type flywheel because the ring seat is integrated with the ring spring part, and the ring spring part is formed by curving the ring spring part in a wavy shape. Therefore, there is an effect that a sufficient elastic force and a friction torque associated therewith can be generated without using an expensive component such as a disc spring.

[Brief description of the drawings]

FIG. 1 is a sectional view of a two-mass type flywheel embodying the present invention.

FIG. 2 is a sectional view of a main part of the same as above.

FIG. 3 is a perspective view of a ring spring with a seat according to the present invention.

FIG. 4 is a side view of the same.

[Figure 5] Same as above

[Fig. 6] Relationship between friction torque and set height

FIG. 7 is a sectional view of a conventional example.

[Explanation of symbols]

2 1st flywheel 3 2nd flywheel 6 Friction type vibration damping device 7 Buffer spring 8 Friction surface 12 Friction plate 14 Ring spring with seat 15 Push plate 17 Ring seat part 18 Ring spring part 18 ₁ Mountain part 18 ₂ Valley part

Claims (1)

[Claims] 1. A two-mass type flywheel in which a friction type vibration damping device is provided on the inner surface of a first flywheel, and a buffer spring is interposed between a friction drive plate of the friction type vibration damping device and a second flywheel. The friction type vibration damping device,
A friction surface on the inner surface of the first flywheel, and a friction plate, a friction drive plate, a ring spring with a seat, and a push plate that sequentially overlap with the friction surface, the ring spring with a seat having a flat ring seat portion of less than one turn; A two-mass type flywheel, characterized in that it comprises a ring spring part of approximately one turn that is curved in a wavy shape in the winding direction.