JPS6215781B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a dynamic damper, and more particularly to a swing stop mechanism for a dynamic damper. A dynamic damper is used to reduce rotational fluctuations of a rotational drive source such as an internal combustion engine. That is, a flywheel connectable to a rotational drive source such as an internal combustion engine is rotatable around a shaft, and a damper is pivotally mounted to the flywheel eccentrically from the shaft to reduce rotational fluctuations of the drive source.

When a rotary drive source to which such a dynamic damper is connected, such as an internal combustion engine, is rotated at high speed, the swinging angular velocity of the damper increases with the high speed rotation, and the bearing surface pressure at the damper pivot joint increases, resulting in insufficient durability of the bearing. The problem arises. An additional problem is that the damper swings with a large amplitude due to large rotational fluctuations when the rotary drive source starts and stops, resulting in insufficient durability of the bearing in the damper pivoting portion. SUMMARY OF THE INVENTION An object of the present invention is to improve the durability of a bearing in a damper pivot portion in a dynamic damper.

In order to prevent bearing damage to the damper pivot portion during high-speed rotation as described above, the present invention makes a pair of stopper pins movable in the radial direction according to the rotational speed of the flywheel, and makes the side surface of the damper fan-shaped. To provide a stopping mechanism for a dynamic damper, which stops the swinging of a damper by clamping the side surface of the damper with a stopper pin when a drive source rotates at high speed. Furthermore, in order to prevent damage to the bearing of the damper pivot portion when starting and stopping the rotational drive source, the present invention provides, in addition to the above-described structure, a wide base portion of the fan-shaped damper that can be engaged with the stopper pin. To provide a stopping mechanism for a dynamic damper, in which a stopper surface is formed to stop the swinging of the damper when a rotational drive source is started or stopped.

Embodiments of the present invention will be described below with reference to the accompanying drawings. In FIG. 1, which is a front view of an embodiment of the present invention, FIG. 2, which is a sectional view taken along the line - in FIG. 1, and FIG. 3, which is a rear view of FIG. It is rotatably supported. The shaft 3 can be connected to a rotational drive source (not shown) such as an internal combustion engine. A pivot pin 5 is protruded from the surface of the flywheel 1 at a predetermined distance from the shaft 3, and a damper 7 is pivotably attached to the pivot pin 5. Here, the damper 7 is connected to the flywheel 1 as best shown in FIG.
The pivot arm 7c is connected to the main body, which has a fan-shaped side surface 7a that expands outward and a parallel wide stopper surface 7b formed at the base of the fan-shaped side surface 7a. It is pivotally connected to a pivot pin 5 via a suitable bearing (not shown).

A pair of slits 1a are bored in the flywheel 1 in parallel to a line connecting the shaft 3 and the pivot pin 5. The width of the slit 1a is made slightly larger than the outer diameter of the stopper pin 9, which will be described later.
The center-to-center distance a is slightly larger than the sum of the distance between both stopper surfaces 7b of the damper 7 and the outer diameter of the stopper pin 9.

The slit 1a from the back side of the flywheel 1
A stopper pin 9 is inserted into each of the dampers 7 with its tips slightly protruding from the front surface of the damper 7, and the rear end of the stopper pin 9 is fixed to a connecting rod 11. A weight 13 of a predetermined weight is fixed to the middle point of the connecting rod 11, a spring seat 15 is rotatably supported on the shaft 3, and a tension spring 17 is stretched between the weight 13 and the spring seat 15. It's on a shelf.

In the embodiment of the present invention having the above configuration, when the rotational drive source (internal combustion engine) is started, the rotational speed of the flywheel 1 is low and the centrifugal force acting on the weight 13 is small, and the spring force of the tension spring 17 is applied to the stopper pin 9. 4 is at the upper end position of the slit 1a, so that the wide stopper surface 7b of the damper 7 is held by the stopper pin 9. Therefore, when starting with large rotational fluctuations, damper 7
By forcibly stopping the swinging of the damper, it is possible to prevent a decrease in the durability of the bearing to which the damper is pivotally connected. Note that the same operation as described above also occurs when the engine is stopped.

Next, when the rotary drive source rotates at a low speed, for example, when the internal combustion engine rotates at an idling speed, the weight 13 moves outward against the tension spring 17 due to centrifugal force depending on the rotational speed of the flywheel 1.
Accordingly, the stopper pin 9 moves outward within the slit 1a of the flywheel 1, leaves the stopper surface 7b of the damper 7, and is located on the side of the fan-shaped side surface 7a, as shown in FIG. This causes the damper 7 to swing around the pivot pin 5. Moreover, when the engine is idling, torque fluctuations are large and it is necessary to increase the swing angle of the damper, but in the present invention, this need can be met by making the side surface of the damper fan-shaped.

Further, as the rotational drive source (internal combustion engine) rotates at a high speed, the weight 13 moves outward together with the stopper pin 9, and the gap between the fan-shaped side surface 7a of the damper 7 and the stopper pin 9 becomes smaller. Since the torque fluctuation decreases as the rotational speed increases, the damper swing angle becomes smaller, and the above-mentioned configuration is sufficient. When the rotational speed exceeds a predetermined speed, the weight 13 and stopper pin 9
reaches the outermost position as shown in FIGS. 1 to 3, and the stopper pins 9 clamp the damper 7 from both sides and stop its swinging.

In order to prevent impact noise caused by the contact between the stopper pin 9 and the damper 7, the surface of the stopper pin 9 or the fan-shaped side surface 7a and the stopper surface 7b may be covered with a cushioning material 10 such as rubber, as shown in FIG. preferable.

[Brief explanation of the drawing]

FIG. 1 is a front view of an embodiment of the present invention, FIG. 2 is a sectional view taken along the - line in FIG. 1, FIG. 3 is a rear view of FIG. 1, and FIG. 4 is an embodiment shown in FIG. 1. FIG. 5 is a partial front view of the embodiment shown in FIG. 1 at medium speed, and FIG. 6 is a front view of another embodiment of the stopper pin. 1...Flywheel, 1a...Slit, 3
... Shaft, 7 ... Damper, 7a ... Fan-shaped side surface, 7b ... Stopper surface, 9 ... Stopper pin,
13... Weight, 17... Tension spring.

Claims (1)

[Scope of Claims] 1. A flywheel connectable to a rotational drive source is rotatable around a shaft, and a damper is pivotally attached to the flywheel eccentrically from the shaft to reduce rotational fluctuations of the drive source. In the dynamic damper, the pair of stopper pins are movable in the radial direction according to the rotational speed of the flywheel, and the side surfaces of the damper are fan-shaped,
A rocking stop mechanism for a dynamic damper, characterized in that the rocking of the damper is stopped by clamping the side surface of the damper with a stopper pin when a rotary drive source rotates at high speed. 2. A damper having a fan-shaped side surface that expands outward from a pivot point is pivotally attached to the surface of the flywheel with the expanded portion facing the outer periphery of the flywheel, and one end of the tension spring is connected to the shaft on the back surface of the flywheel. and a weight is fixed to the other end of the flywheel, and the stopper pin connected to the weight is projected from the surface of the flywheel through a slit formed in the surface of the flywheel. Dynamic damper swing stop mechanism. 3. A dynamic damper in which a flywheel connectable to a rotational drive source is rotatable around a shaft, and a damper is pivotally attached to the flywheel eccentrically from the shaft to reduce rotational fluctuations of the drive source, The pair of stopper pins are movable in the radial direction according to the rotational speed of the flywheel, and the side surface of the damper is fan-shaped,
When the rotary drive source rotates at high speed, the side surface of the damper is held by a stopper pin to stop the swinging of the damper, and further, a wide stopper surface that can be engaged with the stopper pin is formed at the base of the fan-shaped damper, A swing stop mechanism for a dynamic damper, characterized in that the swing of the damper is stopped when a rotational drive source is started or stopped. 4. A damper having a fan-shaped side surface that expands outward from a pivot point is pivotally attached to the flywheel surface with the expanded portion facing the outer periphery of the flywheel, and one end of the tension spring is connected to the shaft on the back surface of the flywheel. and a weight is fixed to the other end of the flywheel, and the stopper pin connected to the weight is projected from the surface of the flywheel through a slit formed in the surface of the flywheel. Dynamic damper swing stop mechanism.