JPH07208528A - Movable valve protecting mechanism for high torque damper - Google Patents

Abstract

PURPOSE:To prevent the deterioration in the damper function due to the breakage of a movable valve by forming a protector which projects to the left and right sides of a shaft blade so as to form the outside of the movable valve, integrally with the shaft part. CONSTITUTION:A movable valve 7 is made of synthetic resin, and has a U-shaped section. A large passage 9 cut in a rectangular shape is formed in a large passage 7a as the left and right superposed walls, and a small passage 8 consisting of a small hole is formed at the other small passage angle 7a. The protectors 4a and 4b which project to the left and right sides of a shaft blade 6 and form the outside of the movable valve 7 are formed integrally with the shaft part 4. Accordingly, if a rotary member 5 is revolved in the direction having the high torque, i.e., in the leftward direction, a casing blade 12 and the protector 4a of the rotary member 5 collide, and the over-revolution is suppressed, and the collision between the casing blade 12 and the small passage angle 7a of the movable valve 7 is prevented, and each angle of the movable valve 7 is protected, free from being nipped by the above-described both.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high torque damper that exhibits a high torque damping action, and more particularly to a movable valve protection mechanism for preventing deformation of a movable valve.

[0002]

2. Description of the Related Art As a damper for high torque, Japanese Unexamined Patent Publication No.
No. 282039. As shown in FIG. 5, this high torque damper has a casing (3) having a cylindrical chamber (1) filled with a viscous fluid (2).
And a rotating member (5) which is rotatably combined with the outer casing (3) and has a shaft (4) rotatable in the chamber (1) as a center, and the rotating member (5). ) Can be locked to the axial blades (6) provided in the shaft part (4) with a play in the rotational direction, and the other surface is the wall surface of the chamber (1) or the shaft part (4). And a movable valve (7) that is rotatable while slidingly contacting the peripheral surface, and has a plurality of fluid passages (8, 9, 10) having different cross-sectional areas for changing the resistance according to the direction of relative rotation. Blade (6) and movable valve (7)
It has a structure so that it is provided at the contact part of.

The casing (3) and the rotating member (5) rotate relative to each other, whereby the movable valve (7).
Also rotates in the viscous fluid (2) and changes position. The outer movable valve (7) can be locked to the shaft vane (6) with play in the rotational direction, and the fluid passages (8, 9) having different cross-sectional areas are respectively provided in the shaft vane (6) and the movable valve (7). , 10) are formed, and the resistance is changed according to the rotation direction.

Therefore, there is almost no resistance to rotation in one direction, and a large resistance is generated only in rotation in the opposite direction and only in rotation in the small passage (8) direction. The resistance in the case of rotation toward the small passage (8) side is that a very high torque is generated because the movable valve (7) and the shaft blade (6) are in contact with each other and there is no gap.

That is, the smaller the size of the hole of the small passage (8), the larger the torque is obtained, and the rotational torque can be freely changed by changing the size of the hole.

However, the movable valve (7) is made of a synthetic resin material and is weak. Therefore, FIG.
As shown in (A) of FIG.
When rotated to the side (counterclockwise rotation), the angle (7a) having the small passage (8) of the movable valve (7) moves to the shaft blade (6).
And the casing blade (12) which is a stopper,
If it is extremely compressed, it will be damaged, and as shown in FIG. 5B, if it is rotated in the reverse direction (clockwise), the small passage angle (7a) will be in an extended state.

When the rotary member (5) is rotated to the left again, the shaft vane (6) surpasses the movable valve (7) and comes off, as shown in FIG. When the rotary member (5) is rotated clockwise as shown in (D) and the movable valve (7) is rotated until it collides with the casing blades (3a), the small passage angle (7a) is deformed, and the small passage angle (7a) becomes a damper. The inconvenient point that the function of will disappear will occur.

[0008]

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and protects the movable valve by preventing the movable valve (7) from being damaged and losing its damper function. It is an object to provide a mechanism.

[0009]

To solve the above problems, the present invention relates to a casing (3) having a casing blade (12) having a viscous fluid (2) therein and functioning as a stopper projecting inward. A shaft portion (4) having at least one shaft vane (6) extending in the axial direction and having a notch passage (10) centered on the shaft portion (4) so as to be rotatable relative to the casing (3) A rotatable member (5),
A damper for high torque, comprising a movable valve (7) made of synthetic resin, which is attached to the shaft blade (6) so as to have a play in a rotational direction and has a small passage (8) and a large passage (9) at each angle. The protector (4) protruding to the left and right sides of the shaft blade (6) so as to be outside the movable valve (7).
a, 4b) is a movable valve protection mechanism in a high torque damper integrally formed with the shaft portion (4).

[0010]

As shown in FIG. 3, when the rotating member (5) is rotated in the direction of high torque, that is, leftward rotation, the casing blades (12) and the protector (4) of the rotating member (5) are rotated.
a) collides with each other to prevent further rotation, and the casing blade (12) and the small passage angle (7) of the movable valve (7).
The collision with a) is avoided, and each angle of the movable valve (7) is protected without being sandwiched between them.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to an embodiment shown in the drawings. FIG. 1 is an exploded perspective view of a high torque damper according to the present invention, and the same members as those described in the conventional example will be described using the same reference numerals.

In the figure, the casing (3) has a hollow cylindrical chamber (1), a mounting flange (13) is provided at one end thereof, and a closing lid (14) is provided on the inner circumference to close the one end. ) Is screwed on. (15) is the closing lid (14)
It is a bearing recess formed in the center of.

The rotating member (5) is rotatably attached to the casing (3) and serves as a member corresponding to the input shaft, and the tip portion (16) of the central shaft portion (4) is the bearing recess (15). ) Is supported. Inner wall surface of the chamber (1) (1
A viscous fluid (2) called torque grease is filled between the shaft (4) and the shaft (7). (11) is a sealing means such as an O-ring. The casing (3) is formed therein with casing blades (12) protruding inward and having a function as a stopper for restricting rotation of the rotating member (5).

The shaft portion (4) is provided with a shaft blade (6) projecting along the axial direction, and the shaft blade (6) is provided at an appropriate portion thereof depending on the positional relationship with a movable valve (7) described later and the rotation direction. A cutout passage (10) is formed to determine the passage amount of the viscous fluid (2).

The movable valve (7) is made of a synthetic resin material and has a U-shaped cross section. The large passage angle (7b), which is the left and right hanging wall, is formed with a large passage (9) which is largely cut in a rectangular shape, and the other small passage angle (7
A small passage (8) consisting of small holes is formed in a).

The movable valve (7) is arranged so as to straddle the shaft blade (6).

As shown in detail in the drawings, the shaft portion (4) is integrally formed with a pair of protectors (4a, 4b) extending axially around the shaft blade (6) and projecting. Has been done.

In FIG. 2, when the rotating member (5) is rotated counterclockwise, that is, when it is rotated toward the small passage (8),
Viscous fluid (2) with a flow rate limited by the small passage (8)
, The rotary member (5) receives a large resistance to the rotation and requires a high torque for the rotation.

Reference numeral (20) is a ring-shaped bearing member for bearing the other end of the rotating member (5).

The present invention has the above-mentioned structure. As shown in FIG. 3, when the rotating member (5) is rotated in the direction of high torque, that is, when it is rotated counterclockwise, the casing blades (12) are rotated. And a protector (4a) for the rotating member (5)
Collide with each other, further rotation is prevented, the collision between the casing blade (12) and the small passage angle (7a) of the movable valve (7) is avoided, and the movable valve (7) is not sandwiched between the two. Each angle is protected.

FIG. 4 shows another embodiment,
Two sets of shaft blades (6) and movable valves (7) are provided, and protectors (4a, 4b) are provided on both sides of each shaft blade (6). Therefore, the torque can be doubled and the rotation angle can be halved as compared with the embodiment shown in FIG.

In the above embodiments, the shaft blade (6) is provided on the rotating member (5) side. However, conversely, the shaft blade (6) is provided on the inner wall surface of the casing (3) ( 17) is provided, for example, like a casing blade (12), on which a movable valve (7) is straddled, and the inner surface of which is slidably contacted with the shaft portion (4) of the rotating member (5). May be.

[0023]

As described above, according to the present invention, a pair of protectors, which extend in the axial direction and project on both sides of the shaft blade, are formed integrally with the rotating member so as to be positioned outside the movable valve. Therefore, the angle of the movable valve is not sandwiched between the casing blade and the shaft blade, and there is an effect of completely protecting the movable valve without damaging it.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of a high torque damper according to the present invention.

FIG. 2 is a schematic cross-sectional view of a damper according to the present invention.

FIG. 3 is a schematic cross-sectional view of the damper in a state where the damper is rotated from the state of FIG.

FIG. 4 is a schematic sectional view of a damper showing another embodiment according to the present invention.

FIG. 5 is a schematic sectional view of a conventional damper.

[Code]

 1 chamber 2 viscous fluid 3 casing 4 shaft part 4a protector 4b protector 5 rotating member 6 shaft blade 7 movable valve 8 small passage 9 large passage 10 notch passage 11 sealing means 12 casing blade

Claims (2)

[Claims] 1. A casing (3) having a casing blade (12) having a viscous fluid (2) therein and functioning as a stopper projecting inward, and a notch passage (10) extending axially. A rotating member (5) having a shaft portion (4) having at least one shaft blade (6) as a center and mounted so as to be rotatable relative to the casing (3).
And a movable valve (7) made of synthetic resin, which is attached to the shaft blade (6) so as to have a play in the rotational direction and has a small passage (8) and a large passage (9) at each angle. A protector (4a, 4b) projecting to the left and right sides of the shaft blade (6) so as to be outside the movable valve (7) is integrally formed with the shaft portion (4). Movable valve protection mechanism in the high torque damper. 2. The damper for high torque according to claim 1, wherein the shaft blade (6), the movable valve (7) and the protector (4a, 4b) are provided at two or more places. Movable valve protection mechanism.