JPS633478Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a rotary shock absorbing device that is provided at the stroke end of a transported object and cushions the impact when the transported object collides.

For example, a rotary shock absorber is used to absorb the impact at the stroke end of a moving object that moves at high speed, such as a light source transport member of a copying machine. Conventionally known shock absorbers of this type are composed of a casing filled with a viscous liquid such as high-viscosity silicone oil, a rotating shaft protruding into the casing, and a rotating body located inside the casing and connected to the rotating shaft to rotate together with the rotating body. When the rotating body rotates inside the casing due to the rotation of the rotating shaft, the rotating shaft can be decelerated by the viscous resistance of the viscous liquid sealed inside the casing.

By the way, in the case of a shock absorber used in a copying machine, it is necessary to have a small damping force when the rotary shaft rotates at a low speed, and to increase the damping force when the rotating shaft is rotated at a high speed. However, in the conventional damping device described above, the viscous resistance of the viscous liquid acting on the rotating body is proportional to the rotational speed of the rotating shaft, so it is not always possible to effectively dampen the damping effect when the rotating shaft rotates at high speed. It may not be possible to make full use of it. In particular, when excessive acceleration is applied to the rotating shaft, the impact energy cannot be completely absorbed, resulting in a large impact peak at the end of the stroke of the transferred object.

The present invention has been developed in view of the above points, and its purpose is to provide a shock absorber that generates a small damping force when the rotary shaft rotates at low speed, and the damping force increases significantly when the rotating shaft rotates at high speed. be.

In order to achieve the above-mentioned object, the present invention includes: a casing containing a viscous liquid; a rotating shaft having one end inserted into the casing and the other end extending outside the casing; a rotating body located in a casing, inserted into the rotating shaft and rotating together with the rotating shaft; an inertial body inserted into the rotating shaft so as to face the rotating body; and the inertial body and the rotating body. a spacing member that is interposed between the inertial body and the casing inner wall and is capable of displacing the inertial body in a direction away from the rotating body; The casing is characterized in that it comprises at least an inclined part formed on the inner wall of the casing so as to reduce the gap between the parts, and a biasing means for biasing the inertial body in a direction approaching the rotating body. .

Embodiments of the present invention will be described below based on the drawings.

First, in FIG. 1, reference numeral 1 indicates a cup-shaped casing, and the casing 1 has a flange portion 1A formed at its opening end, and bolt insertion holes 2, 2, and 2 provided in the flange portion 1A. It is adapted to be attached to the support member by... A lid 3 is screwed onto the open end of the casing 1, and the inside of the casing 1 forms a sealed chamber 4 in which a viscous liquid such as high-viscosity silicone oil is sealed.

Reference numeral 5 indicates a rotating shaft, one end of which is located inside the casing 1, the other end is provided so as to extend outside through the lid 3, and the tip of the rotating shaft 5 is provided with a transfer object. It serves as a mounting portion 5A to which a collision member (not shown) to be collided is mounted. A rotating body 6 is disposed within the casing 1,
The rotating body 6 is fitted onto the rotating shaft 5,
A key 7 is interposed in the fitting portion, so that the rotating body 6 is rotated integrally with the rotating shaft 5 and its movement in the axial direction is restricted.
Further, an inertial body 8 is disposed within the casing 1 so as to face the rotating body 6, and the inertial body 8 is loosely fitted onto the rotating shaft 5. The inertial body 8 is located on the closed end side of the casing 1, the rotating body 6 is located on the lid body 3 side, and the inertial body 8 has a larger mass. Furthermore, the rotating shaft 5, the rotating body 6, and the inertial body 8 are assembled concentrically with the casing 1. Furthermore, a plurality of sets of symmetrical and mutually opposing conical holes 9 and 10 are provided on the opposing side surfaces of the rotating body 6 and the inertial body 8, and each of the conical holes 9 and 1
A steel ball 11 is interposed between the conical holes 9 and 10 and the steel ball 11 to form a spacing member consisting of a rotary/linear cam mechanism, which connects the inertial body 8 to the rotary body 6 as described later. It has a function to cause the inertial body 8 to follow the rotation and to separate the inertial body 8 from the rotary body 6 when the rotary body 6 rotates at high speed and a rotational phase difference occurs between the rotary body 6 and the inertial body 8 . Further, a spring seat 12 is fitted to the rotating shaft 5 on the closed end side of the casing 1, and a spring 13 as a biasing means is stretched between the spring seat 12 and the inertial body 8. , the spring 13
As a result, the inertial body 8 is always urged in a direction approaching the rotating body 6, and thereby the steel ball 11 is always held between the conical holes 9 and 10.

Furthermore, the inertial body 8 has a truncated conical shape whose diameter decreases in the direction away from the rotating body 6, and its outer peripheral surface is an inclined surface 8A. On the other hand, the casing 1 has an inclined surface 1B having a taper angle substantially the same as the inclined surface 8A of the inertial body 8 from a portion facing the inertial body 8 toward the closed end.

In the figure, 14 indicates a sealing member provided between the rotating shaft 5 and the lid 3, and 15 indicates a sealing member provided between the lid 3 and the casing 1.

The shock absorber according to the present invention has the above-mentioned configuration, in which a viscous liquid such as high viscosity silicone oil is sealed in the sealed chamber 4, and is installed near the stroke end of the transferred object by inserting a bolt into the insertion hole 2. The attachment part 5 of the rotating shaft 5
By attaching a collision member to A, the effect of buffering the collision of the transported object is exerted.

When the transported object collides with the collision member, the rotating shaft 5 rotates, and the rotating body 6 is also rotated together with this. When the rotational speed of the rotating shaft 5 is low, a steel ball 11 is provided between the rotating body 6 and the inertial body 8.
is interposed, and the steel ball 11 is held between the rotating body 6 and the inertial body 8 by the spring 13, so that the inertial body 8 is rotated integrally with the rotating body 6. The rotating body 6 and the inertial body 8
Since a viscous liquid exists between the outer surface of the casing 1 and the inner wall of the casing 1, the viscous liquid is sheared when the rotating body 6 and the inertial body 8 rotate, and the resistance force generated when the viscous liquid is sheared. Rotating body 6
Then, the inertial body 8 is decelerated, and the damping effect of the rotating shaft 5 is exerted.

Incidentally, the resistance during shearing of the viscous liquid, so-called viscous resistance, changes depending on the distance between the rotating member and the fixed member. That is, the closer the rotating member is to the fixed member, the more the viscous resistance increases. and,
As shown in FIG.
0, the gap between the inclined surface 8A of the inertial body 8 and the inclined surface 1B of the casing 1 is A.
It is becoming. Therefore, when the inertial body 8 rotates in this state, viscous resistance corresponding to the gap A is generated.

However, when the transferred object is transferred at a high speed, the rotating shaft 5 is rapidly rotated due to its acceleration. Since the inertial mass of the inertial body 8 is larger than that of the rotating body 6, the inertial body 8 is larger than the rotating body 6.
A rotational phase difference occurs between the two. As a result, steel ball 1
1 rolls from the deep part of the conical holes 9 and 10 and rides on the inclined walls thereof, and the rotating body 6 and the inertial body 8
Becomes caught between. Since the rotation body 6 is restricted from being displaced in the axial direction by the key 7, the inertia body 8 is displaced in the axial direction against the spring 13 and separated from the rotation body 6, as shown in FIG. The state shown will be reached. Therefore, when the inertial body 8 is displaced in this way, the inclined surface 8A is brought closer to the inclined surface 1B of the casing 1, and the gap B formed therebetween is larger than the gap A in the state shown in FIG. Decrease. In this way, the inertial body 8 is rotated with a small gap B between it and the casing 1, so the viscous resistance of the viscous liquid interposed between them increases at an accelerating rate, and the large impact force of the transferred object increases. can be effectively damped, and the damping force characteristics can be changed steplessly according to the input.

Further, when the load of the transferred object acting on the rotating shaft 5 is removed, the inertial body 8 returns to the state shown in FIG. 1 due to the action of the spring 13.

In addition, in the above embodiment, the inertial body 8 and the casing 1 are provided with the inclined surfaces 8A and 1B, respectively, but if the casing 1 is provided with the inclined surface 1B, the inertial body 8 does not need to be provided with the inclined surface. , the gap therebetween can be reduced when the inertial body 8 is displaced in the axial direction. Furthermore, although the steel ball 11 and the conical holes 9 and 10 form the spacing member, the spacing member may also be formed by other rotational or linear motion cam mechanisms.

As explained in detail above, according to the shock absorber according to the present invention, when the rotational speed of the rotating shaft increases, the inertial body is displaced in the axial direction, reducing the gap between the inertial body and the casing. Therefore, when the impact force transmitted to the rotating shaft is small, the damping force is small, and when the impact transmitted to the rotating shaft is extremely large, a significantly large damping force can be generated. It is possible to effectively and reliably perform a damping action in accordance with the magnitude of input to the shaft.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view of the shock absorber according to the present invention, and FIG. 2 is an explanatory view of the operation showing a different operating state from that in FIG. 1. 1...Casing, 1B, 8A...Slope, 4
... Sealed chamber, 5 ... Rotating shaft, 6 ... Rotating body, 8 ...
...Inertial body, 9, 10... Conical hole, 11... Steel ball,
13...Spring.

Claims (1)

[Scope of utility model registration request] a casing enclosing a viscous liquid; a rotating shaft provided so that one end is inserted into the casing and the other end extends outside the casing; and a rotating shaft located within the casing and provided on the rotating shaft. a rotating body that rotates together with a rotating shaft; an inertial body that is inserted into the rotating shaft so as to face the rotating body; and an inertial body that is interposed between the inertial body and the rotating body, and that a spacing member that can be axially spaced from the
an inclined portion formed on at least the inner wall of the casing so as to reduce a gap between the inertial body and the inner wall of the casing when the inertial body is separated from the rotating body; and a slope portion that brings the inertial body close to the rotating body. A shock absorber comprising a biasing means for biasing in a direction.