JP3031614B2 - Oil damper and method of assembling parts thereof - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an oil damper for applying a damping force due to a hydraulic resistance to a rotational force around an axis, and a method for assembling the oil damper.

[0002]

2. Description of the Related Art A casing having a chamber filled with a viscous fluid therein as an oil damper for attenuating a rotational force given to a shaft by hydraulic resistance, and a chamber rotatable relative to the casing. A rotating member having a shaft portion disposed at the end of the casing, and an end cap having a central opening that closes an open end of the casing and rotatably supports the rotating member. A movable valve body which acts so as not to generate a damping force at the time of reverse rotation is provided detachably with respect to the shaft portion, and the rotating strobe is provided.
It is known that a damping force adjusting groove is provided on the outer periphery of a shaft to change the damping force between the first half and the second half of the shaft. Such an oil damper may change the damping force of each of the left-rotation damper and the right-rotation damper from low to high, or may change from high to low, depending on the application. In order to meet these requirements, the direction of the movable valve body is changed between when the left rotation of the rotating member is normal rotation and when the right rotation is normal rotation, and the damping force adjusting groove is formed directly on the shaft portion. Therefore, it is necessary to prepare two types of rotating members, one provided with a shaft for left rotation and the other provided with a shaft for right rotation.

[0003]

However, when at least two types of rotating members are separately manufactured as described above,
There is a problem in that dimensional variations occur between the two, and fine adjustment may be required when assembling a movable valve body and other parts shared by both in order to obtain stable damper performance. Further, when the pressure partition is formed integrally with the shaft of the rotating member, when the internal pressure due to the viscous fluid in the chamber is increased, the chamber pressure applied to the pressure partition surface of the shaft is applied to the rotating member as a thrust force. Act, the contact pressure between the rotating member and the end cap increases, and as a result, the torque required for the rotation of the shaft may change from the set value, and the sealing property of the casing due to wear of the contact member. There is a possibility that problems such as deterioration of the film may occur.

Accordingly, the present invention has been made in view of the above-mentioned problems that have been encountered in the prior art, and reduces the damping force from low to high and vice versa in each of the left and right rotations of the shaft. And a method for assembling the oil damper, which eliminates the need to manufacture a plurality of types of rotating members as in the prior art in order to obtain a change in the size, thereby eliminating variations in component dimensions and obtaining stable damper performance. The main purpose is to It is still another object of the present invention to provide an oil damper and a method for assembling the oil damper, which can avoid problems caused by the application of a thrust force to the rotating member in the conventional device.

[0005]

According to a first aspect of the present invention, there is provided a casing having a chamber filled with a viscous fluid therein and having an open end, and A rotating member having a small-diameter shaft portion disposed at one end side in the axial direction and disposed in the chamber of the casing; A damping force adjustment direction selector provided with a projection formed in the outer peripheral surface in the axial direction and a damping force adjustment groove formed in the circumferential direction, and a protrusion of the damping force adjustment direction selector. A movable valve body that is provided so as to be able to be assembled in either the forward or reverse direction with respect to the strip, and that rotates with the shaft portion while slidingly contacting the inner wall surface of the chamber when the rotating member rotates, to generate a damping force;
And an end cap for closing the open end of the casing and rotatably supporting the rotating member.

The rotating member has a large-diameter base shaft formed on the other end side adjacent to the shaft, and is rotatable relative to the shaft between the base shaft and the damping force adjustment direction selector. A pressure bulkhead arranged and defining one end of a chamber in the casing may be configured separately from the rotating member.

In the second invention, the movable valve element is mounted on the ridge of the damping force adjusting direction selector, and the position of the damping force adjusting direction selector with respect to the ridge of the damping force adjusting groove is selected. The rotating member mounted on the shaft of the rotating member, filling the chamber inside the casing with a viscous fluid, and mounting the damping force adjusting direction selector provided with the movable valve body, the shaft of the rotating member is cased indoors. A method for assembling the oil damper, comprising the steps of: arranging the rotating member relatively with respect to the opening member; and closing the open end of the casing while rotatably supporting the rotating member with the end cap. You.

Before the damping force adjusting direction selector is mounted on the shaft of the rotating member, the pressure bulkhead can be mounted in advance on the base end of the shaft of the rotating member.

According to the first and second aspects of the invention, the shaft portion of the rotating member and the damping force adjusting direction selector are separated so that the latter can be mounted on the former, so that a single kind of rotating member is provided. And a combination of selection of the mounting direction of the damping force adjustment direction selector and selection of the mounting direction of the movable valve element with respect to the ridge of the damping force adjustment direction selector. Thus, four types of damper devices can be obtained: a left rotation / highest / lowest variable torque damper, a right rotation / highest / lowest / variable torque damper, and a left rotation / lowest / highest / low variable torque damper. In addition, since a single type of rotating member is used to assemble various members, it is possible to eliminate variations in dimensions between components, and to obtain stable damper performance.
Furthermore, if the rotating member and the pressure partition are configured to be separated,
The internal pressure of the casing received by the pressure bulkhead is transmitted to the end cap, and no thrust force acts on the rotating member. Therefore, when the rotating member rotates, the contact pressure between the pressure bulkhead and the end cap increases and the member associated therewith increases. The trouble caused by the wear of the member can be eliminated.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to the drawings.
It is a main body of an oil damper that generates a damping force by using a flow resistance of a viscous fluid with respect to a rotational force around an axis. As shown in FIGS. 1 and 2, the oil damper body 1 has a bottom wall 2a.
And a substantially cylindrical casing 2 having a closed end having an opening 2b and an open end having an opening 2b, and in which a chamber 3 filled with a viscous fluid 15 is formed. A mounting flange 12 is provided on the outer surface of the casing 2. A rotating member 5 having a shaft 4 is disposed in the chamber 3 so as to be rotatable relative to the casing 2, and a damping force adjusting direction selector 7 having a ridge 6 in the axial direction on the outer periphery of the shaft 4. Have been covered. Ridge 6
The movable valve body 8 is mounted so as to straddle the. The rotating member 5 has a base shaft 10 provided with a pressure partition 9 that defines the chamber 3 in cooperation with the bottom wall 2 a of the casing 2. The opening 2b of the casing 2 is closed by an end cap 11, and the end cap 11 has an opening 11a that rotatably supports the base shaft 10 of the rotating member 5.

The rotating member 5 is a member corresponding to an input shaft, and a tip 4a of the shaft portion 4 is supported by a bearing recess 2c formed in the casing bottom wall 2a. A seal member 16 such as an O-ring is provided on the outer periphery of the base shaft portion 10 of the shaft portion 4 at a sliding contact portion with the end cap 11. The shaft portion 4 has a flat portion 4b cut out along the axial direction. The damping force adjusting direction selector 7 has a hole 7a penetrating in the axial direction, and can be assembled to the shaft portion 4 in any of forward and reverse directions. Hole 7a
Has a flat portion 7b extending in the axial direction. When the shaft portion 4 is inserted into the hole 7a of the damping force adjustment direction selector 7, the shaft portion 4 and the damping force adjustment direction selector 7 It functions as a detent that rotates together.

In the damping force adjusting direction selector 7, the ridge 6 formed on the outer periphery has a substantially cylindrical surface having a substantially circular cross section. The damping force adjusting groove 13 is provided so as to gradually become shallower as the distance from the streak 6 increases. The movable valve element 8 has a substantially concave shape, has a concave surface 8a corresponding to the cylindrical surface of the ridge 6 on a corresponding portion of the bottom surface, and has a substantially C-shaped cross section. The movable valve body 8 can be assembled to the ridge 6 in any of the forward and reverse directions, and in the assembled state, it is rotatable in the circumferential direction on the cylindrical surface of the ridge 6. On the outer surface side, a convex surface 8c having an orifice groove 8b, which is represented by a curve in a cross section,
And a flat cutting surface 8d formed on one end side of the convex surface. Each of the concave surface 8a, the convex surface 8c, and the cut surface 8d extends in the axial direction of the movable valve body 8. The movable valve element 8 is engaged with the ridge 6 such that the cut surface 8 d faces forward or backward in the moving direction, and rotates together with the rotary member 5 while sliding the convex surface 8 c on the inner peripheral surface of the chamber 3. .

A stopper 14 formed of a ridge extending in the axial direction is formed on a part of the inner peripheral surface of the chamber 3 of the casing 2 to limit the rotation range of the rotating member 5. That is, the rotation of the rotating member 5 is restricted by the contact of the front or rear side surface of the movable valve body 8 that rotates integrally with the rotating member 5 with the stopper 14.

1 and 2, the ridge 6 formed on the outer periphery of the damping force adjustment direction selector 7 has a substantially circular cross section, and the movable valve element 8 has a cylindrical surface of the ridge 6. Although it is engaged so as to be rotatable in the circumferential direction above, the cross-sectional shape or structure of the ridge 6 and the movable valve body 8 and the form of engagement between them are not limited to this. In short, even if the movable valve body is engaged with the ridge having a certain cross-sectional shape or structure in either the forward or reverse direction, the rotating member 5 is formed inside or outside the movable valve body by rotation in one direction. It is sufficient that the orifice is opened such that the orifice is opened and the orifice is closed in rotation in the other direction.

For example, in the example shown in FIG. 7, the ridge 36 is formed to have a substantially rectangular cross section, and a notch 36c is formed at an intermediate portion in the axial direction.
Having. The movable valve body 38 has a substantially U-shaped cross section,
It has a pair of vertical walls 38a, 38b located on both sides of the ridge 36 when engaged with the ridge 36. Hanging walls 38a, 38b
The interval therebetween is wider than the width of the ridge 36, and has a play in the rotation direction of the damping force adjustment direction selector 7. One hanging wall 3
A cutout 38c is formed in 8a. In this example, when the rotating member 35 rotates in one direction, the movable valve body 38
The vertical wall 38a of the notch 36
The orifices formed by c and 38c are opened, and when the rotating member 35 is rotated in the other direction, the vertical wall 38a contacts the side surface of the ridge 36 to close these orifices.

In the example shown in FIGS. 1 and 2, the depth of the damping force adjusting groove 13 formed on the outer periphery of the damping force adjusting direction selector 7 on one side of the ridge 6 is away from the ridge 6. It is formed in a triangular shape whose depth is constant and the width gradually decreases as the distance from the ridge 6 increases, or both the depth and the width gradually change. May be formed. In short, any shape may be used as long as a smooth change in the damping force can be obtained by the presence of the groove.

Further, in the example shown in FIGS. 1 and 2, the movable valve element 8 is engaged with the ridge 6 of the damping force adjusting direction selector 7 mounted on the rotary member 5, but the casing chamber has The movable valve element 8 is engaged with the ridge 14 on the inner peripheral surface of the casing 3, and the casing 2
May be configured to rotate. In this case, the protrusion 6 of the damping force adjustment direction selector 7 functions as a stopper for restricting the rotation of the casing 2.

Next, a method of assembling the oil damper 1 shown in FIG. 1 will be described with reference to FIG. First, prior to the assembling work, whether the damping force by the movable valve body 8 is exerted when the rotating member 5 is rotated in the left or right direction with respect to the casing 2 in advance, and whether the rotating stroke of the rotating member 5 is required. Check whether the first half or the second half produces high or low damping force.

According to the result of this confirmation, the damping force adjusting groove 1
It is determined on which side of the ridge 6 the bearing 3 is to be brought, and the direction of the damping force adjusting direction selector 7 with respect to the shaft 4 is determined accordingly, and the shaft 4 of the rotating member 5 is inserted through the damping force adjusting direction selector 7. The damping force adjusting direction selector 7 is inserted through the hole 7a.
Is attached to the shaft 4. For example, the damper shown in FIG. 3 (A) is a “left-rotation low supremacy torque type” in which the damping force changes from low to high when the shaft is rotated leftward, and the damper shown in FIG. Although it is a "right-rotation high-low torque type" in which the damping force changes from high to low, in order to obtain these dampers, the damping force adjusting grooves 13 as shown in FIGS. Is positioned on the upper side of the ridge 6 in the drawing, and the damping force adjustment direction selector 7 is assembled to the shaft portion 4. FIG.
FIG. 3C shows a “left-rotation high-low torque type” damper in which the damping force changes from high to low during left rotation of the shaft shown in FIG.
In order to obtain a “right-rotation low-small-torque type” damper in which the damping force changes from low to high in the right rotation of the shaft shown in (D), the damping is performed as shown in FIGS. 4 (C) and (D). The force adjusting groove 13 is positioned below the ridge 6 in the figure.

Thereafter, it is checked again whether the damping force by the movable valve element 8 should be generated when the shaft portion 4 rotates in the left or right direction with respect to the casing 2. The movable valve body 8 is assembled to the ridge 6 of the damping force adjustment direction selector 7 in the direction. For example, in the counterclockwise damper shown in FIGS. 3A and 3C, as shown in FIGS. 4 is attached to the ridge 6 so as to face forward in the rotation direction, that is, downward in the drawing. On the other hand, FIGS. 3B and 3D
As shown in FIGS. 4B and 4D, in the right-rotation type damper shown in FIG. And attach it to ridge 6.

Next, after injecting an appropriate amount of viscous fluid into the casing 2, the assembly of the shaft 4, the damping force adjusting direction selector 7, and the movable valve body 8 of the rotating member 5 is moved into the casing 2. To place. Finally, the opening 2b of the casing 2 is closed by the end cap 11 while the base shaft 10 of the rotating member 5 is rotatably supported by the opening 11a. At this time, if the end cap 11 is fixed to the opening 2b by welding or the like, an unexpected change in the torque set value resulting from the slack of the end cap 11 can be prevented.

In the above, the damping force adjustment direction selector 7
And the step of assembling the movable valve element 8 with the protrusion 6 of the damping force adjusting direction selector 7 may be reversed.

An example of the operation of the oil damper 1 according to the present invention will be described below. For example, in the case of the damper of the "left-rotating low-high torque type" shown in FIG. 3 (A), the shaft portion 4 is located near the upper side of the stopper 14 on the inner wall of the casing 2 in FIG. The movable valve element 8 is moved from the state where
The left rotation is started with the cut surface 8d facing forward. At this time, the deep damping force adjusting groove 13 located on the upper side of the ridge 6 in the drawing is in contact with the outer peripheral surface of the damping force adjusting direction selector 7.
An orifice having a relatively large cross-sectional area is provided between the inner surface of the shing 2 and the distal end surface of the stopper 14, and the viscous fluid in the chamber 3 is pressed by the cut surface 8 d of the movable valve body 8 to form the cut surface 8 d. From the lower surface of the stopper 14 on the inner wall of the casing 2 in the figure through the damping force adjusting groove 13 and between the ridge 6 and the upper surface of the stopper 14 on the inner wall of the casing 2 in the figure. The damping force generated at this time is very low.
Since the damping force adjusting groove 13 gradually becomes shallower with the rotation of the shaft portion 4, the moving amount of the fluid passing therethrough gradually decreases, and the ridge 6
When the shaft 4 rotates until the stopper 4 is located near the lower side of the stopper 14 on the inner wall of the casing 2 as shown in the figure, the damping force adjusting groove 13 disappears, so that the cut surface 8d of the movable valve body 8 and the casing 2 are separated. The movement of the fluid between the stopper 14 on the inner wall and the lower surface in the figure is extremely restricted, so that the damper 1 generates a high damping force.

In the case of the "right rotation high-low torque type damper" shown in FIG. 3B, when the ridge 6 starts right rotation from the vicinity of the lower surface of the stopper 14 in the figure, at this time, Then
The damping force adjusting groove 1 is provided on the outer peripheral surface of the damping force adjusting direction selector 7.
Since the surface 3 is not formed or is very shallow, the movement of the fluid 15 between the ridge 6 and the upper surface of the stopper 14 on the inner wall of the casing 2 in the drawing is restricted, and a high damping force is generated.
Since the damping force adjusting groove 13 that gradually enlarges the cross-sectional area with the rotation of the shaft portion 4 allows the movement and increase of the fluid, the damping force gradually decreases.

The damper of the “left-rotation high-to-low torque type” shown in FIG. 3C generates a damping force at the time of left-rotating similarly to the case of FIG. Figure 3 (A)
The damping force changes from high to low because it is provided to be extremely small at the beginning and gradually expand thereafter.

The "right rotation low supremacy torque type damper" shown in FIG. 3D generates a damping force at the time of clockwise rotation as in the case of FIG. 3B. Fig. 3
Contrary to the case of (B), the damping force changes from low to high because it is provided so as to start largely and then gradually decrease.

In the structure of the oil damper described above, the pressure partition 9 that defines the chamber 3 of the casing 2 is formed integrally with the base shaft portion 10 of the rotating member 5.
May be configured separately from the rotating member 5. That is, as shown in FIG. 5, the pressure partition wall 109 is separated from the rotating member 105 and the insertion hole 10 that allows the relative rotation of the shaft portion 104.
It is provided as an annular disk having the center 9a. The rotating member 105 integrally has a flange 115 near the shaft portion 104 of the base shaft portion 110. At the time of assembly, the pressure bulkhead 109 is first mounted on the shaft 104 of the rotating member 105, and then held between the flange 115 and the damping force adjustment direction selector 107 mounted on the shaft 104.

The annular pressure bulkhead 10 thus assembled to the rotating member 105 so as to be rotatable with respect to the shaft portion 104.
When the rotating member 9 is disposed in the casing 102 together with the rotating member 105, as shown in FIG. 6, the damping force adjusting direction selector 107 is sandwiched between the step portion 102d formed on the inner surface of the casing 102 and the end cap 111. The working relationship of the force with the flange 115 does not exist in either the rotation direction or the axial direction. Thus, the internal pressure of the chamber 103 is received by the pressure partition wall 109 sandwiched between the casing 102 and the end cap 111, and no thrust force acts on the rotating member 105.

[0029]

As described above, according to the present invention, the shaft portion 4 of the rotating member 5 and the damping force adjusting direction selector 7 are divided so that the movable member can be attached to the damping force adjusting direction selector 7 by changing its direction. Together with the combination with the valve body 8, the degree of freedom in assembling the parts can be greatly improved. As a result, there are various types of dampers, such as a right rotation direction damper, a left rotation direction damper, a damper having a low-to-high damping force change characteristic with rotation of the rotating shaft, and a high-to-low damping force change characteristic. A simple oil damper can be easily obtained using the same parts. Further, there is no need to separately manufacture various types of rotating shaft structures as in the related art, and there is no dimensional variation of parts, and stable damper performance can be obtained.
Furthermore, if the pressure partition 9 formed separately from the shaft portion 4 is assembled to the rotating member 5, conventionally, a thrust force acts on the rotating member due to the internal pressure of the chamber, and the gap between the rotating member and the end cap is increased. Therefore, it is possible to avoid the fluctuation of the torque value due to the contact resistance and the decrease in the torque due to the wear, and it is possible to always obtain a stable damper function.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of an oil damper showing an embodiment of the present invention.

FIG. 2 is an exploded perspective view of the oil damper of FIG.

FIG. 3 is a cross-sectional view taken along the line II-II of FIG. 1 showing various types of oil dampers at an intermediate position of a damping stroke;
(A) is a left-rotating low-to-high torque damper, (B) is a right-rotating low-to-high torque damper, (C) is a left-rotating low-to-high torque damper, and (D) is a right-rotating low-to-high torque damper.

4A and 4B are diagrams showing various examples of assembling the direction of a damping force adjustment direction selector and the direction of a movable valve body, FIG. 4A shows an example of assembling a left-rotating low-high torque type damper, and FIG. Example of assembly for high solstice low torque type damper, (C) Example of assembly for left rotation high solstice low torque type damper, (D) Example of assembly for right rotation low solstice high torque type damper

FIG. 5 is an exploded perspective view of an oil damper showing another embodiment of the present invention.

FIG. 6 is a longitudinal sectional view of the oil damper of FIG. 5;

FIG. 7 is a perspective view of a damping force adjustment direction selector and a movable valve body showing another embodiment of the movable valve mechanism.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Oil damper 2 ... Casing 3 ... Chamber 4 ... Shaft part 5 ... Rotating member 6 ... Protrusion 7 ... Damping force adjustment direction selector 8 ... Movable valve body 8a ... Concave surface 8b ... Orifice groove 8c ... Convex surface 8d ... Cut surface 9: Pressure bulkhead 10: Base shaft portion 11: End cap 12: Mounting flange 13: Damping force adjusting groove 14: Stopper 15: Viscous fluid 16: Seal member

Continuation of the front page (56) References JP-A-6-193666 (JP, A) JP-A-6-147239 (JP, A) JP-A-8-109940 (JP, A) JP-A-50-15974 (JP) JP-A-4-282039 (JP, A) JP-A-5-263847 (JP, A) JP-A-5-263848 (JP, A) JP-A-5-296267 (JP, A) JP-A-8-233013 (JP, A) JP-A-8-303513 (JP, A) JP-A-8-312694 (JP, A) JP-A-9-126265 (JP, A) JP-A-9-133170 (JP, A) A) JP-A-9-184529 (JP, A) JP-A-10-169688 (JP, A) JP-A-10-208124 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) ) F16F 9/14 E05F 3/14

Claims (4)

(57) [Claims] 1. A casing having a chamber filled with a viscous fluid therein and having an open end, a casing rotatably provided relative to the casing, and a casing provided at one end in an axial direction. A rotating member having a small-diameter shaft portion disposed in the chamber of the shing; a ridge and a periphery formed in the outer peripheral surface in an axial direction provided so as to be attachable to the shaft portion in any of forward and reverse directions; A damping force adjusting direction selector provided with a damping force adjusting groove formed in the direction, and provided so as to be able to be assembled in any of the forward and reverse directions with respect to the ridge of the damping force adjusting direction selector, and to rotate the chamber when the rotating member rotates. An oil, comprising: a movable valve element that generates a damping force by rotating together with a shaft portion while slidingly contacting an inner wall surface; and an end cap that closes an open end of a casing and rotatably supports a rotating member. damper. 2. The rotary member has a large-diameter base shaft at the other end in the axial direction, and the oil damper is provided between the base shaft and the damping force adjustment direction selector in the casing of the casing. The oil damper according to claim 1, further comprising a pressure partition defining one end of the rotary member and rotatable relative to the rotating member. 3. The movable member is mounted on the ridge of the damping force adjustment direction selector, and the position of the damping force adjustment direction selector relative to the ridge of the damping force adjustment groove is selected. The rotating member mounted on the shaft portion is filled with a viscous fluid in the chamber inside the casing, and the damping force adjusting direction selector having the movable valve body is mounted on the rotating member. 2. The method of assembling an oil damper according to claim 1, further comprising the steps of: rotatably arranged; and closing the open end of the casing while rotatably supporting the rotating member with the end cap. 3. . 4. The pressure partition is mounted on the shaft of the rotating member, the movable valve element is mounted on the ridge of the damping force adjustment direction selector, and the damping force adjustment direction selector is mounted on the damping force adjustment groove. After selecting a position with respect to the ridge, it is mounted on the shaft of the rotating member, the chamber of the casing is filled with a viscous fluid, and the damping force adjustment direction selector provided with the movable valve body is mounted. And a step of closing the open end of the casing while rotatably supporting the rotating member with the end cap, wherein the shaft is rotatably disposed in the chamber. A method for assembling parts of an oil damper according to claim 2.