JPH04327046A - Fly wheel with torsional damper - Google Patents

Abstract

PURPOSE:To simplify structure and reduce part number and weight. CONSTITUTION:In a fly wheel with torsional damper, a damper device 30 consisting of a rubber bellows 31 is interposed between two inertial bodies 10, 20. An air spring is obtained by an air chamber 34 partitioned in the inner part of the rubber bellows 31, and damping force is obtained by the inertial damping at the time of deforming the rubber bellows 31. Thus, it is not required to provide a frictional mechanism to obtain the damping force, the structure is simplified by the removal of the frictional mechanism, and the number of parts is reduced to reduce the weight.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flywheel with a torsion damper, which greatly simplifies the conventional torsion mechanism including a coil pulling and friction mechanism, thereby reducing the number of parts.

0002

2. Description of the Related Art A conventional flywheel with a torsional damper is constructed of two inertial bodies connected by a coil spring extending in the circumferential direction of the flywheel. A flywheel damper with such a configuration has a resonance point, but since the coil spring itself has virtually no damping force, a separate mechanism that generates friction damping is provided in order to suppress the amplitude at the time of resonance. Therefore, such a friction mechanism is interposed between the two inertial bodies in parallel with the coil spring.

0003

[Problems to be Solved by the Invention] However, the provision of a torsion mechanism consisting of a coil spring and a friction mechanism complicates the structure of the flywheel damper and reduces the number of parts.
This becomes a hindrance when trying to reduce weight.

[0004] The present invention provides a conventional flywheel damper.
By replacing the torsion mechanism including the coil spring and friction mechanism with another structure, the structure is simplified and the number of parts is reduced.
The purpose of the present invention is to provide a flywheel with a torsional damper that reduces weight.

[0005]

[Means for Solving the Problems] The above object is achieved by a flywheel with a torsional damper according to the present invention having the following means. It consists of two inertia bodies arranged so as to be relatively rotatable around a common axis, and a rubber bellows defining an air chamber therein. When compressed, the air chamber becomes an air spring and the rubber bellows A damper device disposed circumferentially between the two inertial bodies to generate a damping force due to internal damping during deformation.

[0006]

[Operation] In the flywheel with the above torsional damper, when torsion (relative angular displacement) occurs between the two inertial bodies,
The damper device is compressed, the air chamber acts as an air spring, and the rubber bellows generates a damping force due to internal damping during deformation. Since the air chamber serves as an air spring, there is no need to provide a circumferentially extending coil spring, which is required in conventional flywheel dampers. Moreover, if the air chamber is compressed to a length close to zero, a very large spring reaction force is obtained, so even if the length of the air chamber is smaller than the length of a conventional coil spring, the spring element can be The spring mechanism is compact. In addition, damping force is obtained due to internal damping when the rubber bellows deforms, so
The friction mechanism required in conventional flywheel dampers becomes unnecessary. Therefore, the damping force generation mechanism is greatly simplified, reducing the number of parts and weight.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of a flywheel with a torsional damper according to the present invention will be described below with reference to FIGS. 1 to 3. In FIGS. 1 and 2, the flywheel with a torsion damper has two inertia bodies, that is, a driving flywheel 10 and a driven flywheel 20, which are arranged to be relatively rotatable about a common axis. Between the drive side flywheel 10 and the driven side flywheel 20, at least one pair, six in the illustrated example, are provided in the circumferential direction.
A pair of damper devices 30 are arranged. However, damper devices 30, 30 provided on both left and right sides of each tongue piece 16, which will be described later.
are considered to be the opposite.

The drive-side flywheel 10 has a structure in which an outer ring 11 and an inner ring 12 on the inner peripheral side thereof are connected by a drive plate 13. Outer ring 11
is connected to the drive plate 13 with rivets 14, and the inner ring 12 and drive plate 13 are fastened together to the engine crankshaft 1 with bolts 2. Since the drive plate 13 can be made from a steel plate, there are advantages such as the ability to reduce the thickness of the plate and ease of press forming the window 15, which will be described later.

The driven flywheel 20 has a structure in which a flywheel body 21, a driven plate 22, and a driven ring 23 are connected by bolts 24. Since the driven plate 22 can be made from a steel plate, there is an advantage that press forming of the driven side seat plate 25, which will be described later, is easy. The driven flywheel 20 connects to the driving flywheel 10 via a ball bearing 3 interposed between the driven ring 23 and the inner ring 12.
They are arranged so as to be relatively rotatable around a common axis 4.

The drive plate 13 includes a damper device 3.
As many windows 15 as there are pairs of 0's are formed. Each window 15 includes two radial extensions 15a, 15a extending in the flywheel radial direction, and a circumferential extension 15b extending in the flywheel circumferential direction and connecting the radial extensions 15a, 15a at their inner peripheral ends. and has. The pair of damper devices 30, 30 are removably fitted in the circumferential direction within the radial extensions 15a, 15a, and are rotated together with the drive plate 13. The drive plate portion between the two radial extensions 15a, 15a forms a radially inwardly extending tongue 16. The tongue piece 16 has drive plate side seat plates 17 on both sides in the flywheel circumferential direction, which are bent at right angles to the tongue piece 16 and extend toward the flywheel main body 21 side. The drive plate 13 transmits circumferential force (torque) to the damper device 30 via the drive plate side seat plate 17.

The driven plate 22 includes an annular portion 22a on the inner peripheral side and an arm 22b extending radially outward from the annular portion 22a.
It consists of Each arm 22b has a driven plate side seat plate 25, which is bent at right angles from the arm 22b and extends toward the drive plate 13, on both sides in the flywheel circumferential direction. A stopper rubber 26 is fixed to the driven plate side seat plate 25 by adhesive or the like. The driven plate 22 is connected via a driven plate side seat plate 25 and a stopper rubber 26.
Circumferential force (torque) is transmitted between the damper device 30 and the damper device 30 .

The drive plate side seat plate 17 and the driven plate side seat plate 25 are opposed to each other in the flywheel circumferential direction, and the damper device 30 is located between both seat plates 17 and 25. The drive device 30 is assembled so that its axis extends in the circumferential direction of the flywheel.

The damper device 30 includes a tire-shaped rubber bellows 31, a first support plate 32 provided at the end of the rubber bellows 31 on the drive plate side and the seat plate 17 side, and a shaft on the driven plate side and the seat plate side. It has a second support plate 33 provided at the directional end. The rubber bellows 31 is airtightly connected to the first support plate 32 and the second support plate 33, and defines an air chamber 34 therein.

First support plate 32 of damper device 30
is fixed to the drive plate side seat plate 17 by rivets 35 and snap rings 36. The second support plate 33 of the damper device 30 has an orifice 37 in a portion facing the center of the stopper rubber 26 that communicates the air chamber 34 with the outside. When the stopper rubber 26 is in contact with the second support plate 33, the orifice 37 is closed by the stopper rubber 26, and the air chamber 34 becomes a closed air chamber. Conversely, when the stopper rubber 26 is apart from the second support plate 33, the orifice 37 is opened and the air chamber 34 communicates with the outside air.

The shape of the damper device 30 in the direction orthogonal to the damper axis is as shown in FIG.
In such a case, the area of the damper device 30 in the direction perpendicular to the damper axis can be increased and a large torque can be received. Further, the length of the damper device 30 in the damper axial direction influences the spring constant of the air spring, and the longer the length, the smaller the spring constant. Therefore, by appropriately selecting the length and area of the damper device 30, a flywheel damper with an appropriate spring constant and torque capacity can be designed. As is clear from the above, the flywheel with torsional damper according to the embodiment of the present invention has the coil spring, friction mechanism, and
It does not have a torque limit mechanism.

The flywheel with a torsion damper according to the embodiment of the present invention has torque versus torsion angle characteristics, ie, torsion characteristics, as shown in FIG. Although FIG. 3 shows only the positive side of the torsion angle, the negative side is symmetrical with respect to the origin. As shown in the figure, the torsion characteristics are non-linear, and the larger the torsion angle, the larger the torque change. That is, when the torsion angle is 0, the damper device 3
0 is not compressed, so the torque is 0, but when a torsion angle occurs, the damper device 30 on the compression side has an initial length L
The length is reduced by the stroke s to become L-s, the initial pressure p increases to pL/(L-s), and the transmitted torque increases non-linearly. However, the diameter of the rubber bellows is assumed to be constant regardless of the increase in pressure.

Next, the operation will be explained. In Figure 1,
The drive side flywheel 10 is the driven side flywheel 20
When the drive plate rotates relative to the drive plate, the damper device 30 located forward in the rotational direction of the tongue 16 of the drive plate is compressed, and the damper device 30 located behind the tongue 16 in the rotational direction separates from the stopper rubber 26. At this time, the orifice 37 of the air chamber 34 of the damper device 30 located in front of the tongue piece 16 in the rotational direction becomes an air spring as it is closed by the stopper rubber 26, and the rubber bellows 31 generates a damping force due to internal damping during deformation. . Further, the orifice 37 of the damper device 30 located at the rear of the tongue piece 16 in the rotational direction is opened, allowing air to flow into the air chamber 34, and the restoring force of the rubber bellows 31 causes the damper device 30 to return to its original length. When reversing, the above is the opposite.

In the flywheel with a torsional damper, the two inertia bodies consisting of the driving side flywheel 10 and the driven side flywheel 20 are connected to the spring consisting of the air spring of the damper device 30 and the inside of the rubber bellows 31 when it is deformed. A vibration system is constructed in which the damping is connected to the damping.

Therefore, the spring is not a conventional coil spring, and the damping is not conventional friction damping. In the case of coil springs, there are problems in that trying to obtain an appropriate spring constant increases the length of the spring, making it difficult to mount it on a flywheel damper and also making it difficult to transmit large torque. Compared to coil springs, air springs can be much smaller in length, which makes them desirable for mounting purposes, and they also have the advantage of being able to transmit large torques because they have nonlinear characteristics. In the case of friction damping, a friction mechanism with a complicated structure is required, which hinders the reduction of the number of parts and weight, but since the product of the present invention does not have a friction mechanism, such problems are solved. It has fewer parts and is lighter in weight.

[0020]

According to the present invention, a flywheel with a simple torsional damper is constructed by replacing the torsion mechanism consisting of a coil spring and a friction mechanism of a conventional flywheel damper with a damper device having a rubber bellows.
The structure can be simplified, the number of parts can be reduced, and in particular, the number of parts can be reduced by eliminating the need for a friction mechanism, and the weight can be reduced.

[Brief explanation of drawings]

FIG. 1 is a partial front view of a flywheel with a torsional damper according to an embodiment of the present invention.

FIG. 2 is a sectional view of the flywheel with torsional damper shown in FIG. 1;

3 is a torsional characteristic diagram of the flywheel with torsional damper shown in FIG. 1. FIG.

[Explanation of symbols]

10 Drive side flywheel (one of the two inertial bodies)
20 Driven flywheel (the other of the two inertial bodies)
26 Stopper rubber 30 Damper device 31 Rubber bellows 32 First support plate 33 Second support plate 34 Air chamber 37 Orifice

Claims (1)

[Claims] Claim 1: Consists of two inertial bodies arranged to be relatively rotatable around a common axis and a rubber bellows defining an air chamber inside, and when compressed, the air chamber becomes an air spring. and a damper device disposed in the circumferential direction between the two inertial bodies so that the rubber bellows generates a damping force due to internal damping when deformed.