JP3053161B2 - Fluid pressure damper - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary type hydraulic pressure damper, and more particularly, to a hydraulic pressure damper having a rotation stopping mechanism for restricting a working body such as a lid or a toilet seat of various devices to a fixed position.

[0002]

2. Description of the Related Art A fluid pressure damper of this type is disclosed in
As described in Japanese Patent No. 82036, etc., there is a partition on the inner wall of the cylinder of the casing, and a structure is provided in which the shaft with the wing rotates, and the wing is filled with oil in the cylinder. When rotated, hydraulic pressure is generated between the wing and the partition, and oil leaks from gaps between the inner walls of the wing and the cylinder and between the partition and the shaft, so that appropriate braking is obtained for the rotational motion. By using this, an operating body such as a lid or a toilet seat is opened and closed at a predetermined braked speed via the shaft.

[0003] Some hydraulic dampers include, for example, a rotation stop mechanism for preventing the operating body from being inadvertently folded and closed from the open state. The conventional rotation stopping mechanism is generally provided with a coil spring, a ball and a locking recess corresponding to the inner wall side of the casing and the shaft side, and a ball urged by the coil spring in the process of rotating the shaft. It is configured to engage with the locking recess in a detachable manner.

[0004]

The above-described rotation stopping mechanism has a problem that a coil spring, a ball and the like are required, the number of parts is large, and the assembly structure is complicated. Therefore, the present applicant has provided a locking groove on the inner wall of the casing, and provided a detent spring member with a claw portion, which is a resin molded product, which is removably engaged with the locking groove, on the shaft side. The mechanism was invented earlier (Japanese Patent Application No. Hei 6-111696).
In this structure, the spring member can be formed with a claw portion using a resin material or the like, and can be easily attached to the outer periphery of the shaft. The corresponding claw portion is formed simultaneously with a part of the spring member, so that the number of parts can be reduced.

[0005] It should be noted that most of the component parts of this type are resin molded products, and it is premised that the resin material is inexpensive.
T resin (polybutylene terephthalate resin) is frequently used. Therefore, the above-mentioned invention was made of PBT resin, performance tests were repeated, and quality improvement was further examined. As a result, it was found that the sliding characteristics, especially the wear resistance, elasticity, compressive strength, etc., could be further improved. This has led to the present invention.

It is an object of the present invention to provide a fluid pressure damper having a simple structure by further improving the above-mentioned rotation stopping mechanism in terms of shape and material, thereby improving wear resistance, elasticity, compressive strength and the like. Is to do. Other objects will be clarified with the following description.

[0007]

SUMMARY OF THE INVENTION The object of the present invention is to provide a main part of the present invention, wherein a shaft 2 having a rotary wing 21 is rotatably incorporated in a cylindrical chamber 14 in a casing 1 in which a partition 11 is protruded. While the rotation of the shaft 2 is braked by the viscous fluid to be filled and filled, the shaft 2 is provided corresponding to the inner wall side and the shaft 2 side of the casing 1 so that the shaft 2 can be disengaged from each other while the shaft 2 is rotated. In a fluid pressure damper provided with a rotation stopping mechanism 7 that engages and restricts rotation of an operating body such as a lid connected to the shaft 2 at a fixed position, the rotation stopping mechanism 7 is a polyamide provided on the inner wall of the casing 1. Fixing ring 8 made of resin
And a rotating ring 9 made of a polyamide resin attached to the outer periphery of the shaft 2. and forming integrally with the outer periphery of each of the convex portions 9a
Has a notch that removes part of the ring thickness just below the protrusion
Being formed so as to be elastically deformable via 92 ;

The rotary wing 21 has a fluid passage 22.
The inner surface of the casing 1
And a sliding contact portion 33 that contacts the fluid passage 22 on one side.
The elongated valve 31 and the other side of the fluid passage 22
The short piece-shaped engaging portion 32 to be hung is integrally formed.
A seal member 3 having a substantially U-shaped cross section is integrally provided.
And is achieved by.

In the present invention, the concave portion 8a and the convex portion 9a engage with each other in a detachable manner. As a more specific shape, in the case of the convex portion 9a, in addition to the semicircular cross-sectional shape described in the embodiment, the convex portion 9a may have a fan-shaped cross-sectional shape. In the case of the concave portion 8a, it is preferable that the locking projection wall 82 and the projection 83 are formed so as to be partitioned, and it is particularly preferable that the locking projection 82 has a hard wall shape such as a rectangular cross section that is difficult to deform. Hereinafter, a hydraulic damper of the present invention will be described with reference to an embodiment shown in the drawings.

[0010]

1 is a longitudinal sectional view of a fluid pressure damper to which the present invention is applied, FIG. 2 is a transverse sectional view of the fluid pressure damper, and FIG. 3 shows constituent members of a rotation stopping mechanism. 1A is a cross-sectional view taken along the line A-A in FIG. 2, and FIG. 1B is a cross-sectional view taken along the line B-B in FIG. 2, in which the holder 6 is omitted.
In the figure, a fluid pressure damper includes a casing 1, a shaft 2 with a rotating blade 21 disposed in the casing 1, a sealing member 3 attached to the rotating blade 21, and a lid attached to an opening side of the casing 1. 5, a lock holder 6, a rotation stopping mechanism 7, and the like.

(Overall Structure of Damper) The casing 1 is formed in a cup shape, and a viscous fluid inlet 12 is provided in a portion corresponding to the bottom (left side in FIG. 2). Is formed in a female screw so that a sealing bolt 16 can be screwed into the hole. 2 on the inner wall of casing 1
Each partition 11 protrudes into the cylindrical chamber 14. The shaft 2 has a shaft hole 24 on the side of the protruding portion 2a protruding from the casing 1, and has a structure in which a shaft such as a lid that requires a damper action is fitted using the shaft hole 24. The shaft 2 has a portion 2b in sliding contact with the inner wall of the casing and the sealing 41 disposed in the orbital groove, a portion 2c including a pair of rotating blades 21, a small-diameter portion 2d pivotally supported by the bearing portion 13, and 2a and part 2b
And a portion 2e to which the rotation ring 9 of the rotation stopping mechanism 7 is attached.

The rotor 21 has a fluid passage 22 and a seal member 3 attached thereto. This seal member 3 is made of rubber or the like, and has a substantially 7-shaped cross section having an elongated elastic valve portion 31 on one side as shown in FIG. Further, the seal member 3 is provided on a short piece-shaped locking portion 32 located on the side where the fluid passage 22 is released, a sliding contact portion 33 covering the tip end surface of the rotary blade 21, and an inner surface of the sliding contact portion 33. And a projection 34 provided integrally therewith, the locking portion 32 is hooked on the upper edge on one side of the rotating blade 21 with respect to the tip surface side of the rotating blade 21, and the projection 34 is provided on the tip surface of the rotating blade 21. And the leading end surface of the rotary blade 21 is
The elastic valve portion 31 is mounted in a state covered with
2 is openably covered. Incidentally, the mounting mode of the seal member 3 is described in FIG.
7 may be used.

(Structure of anti-rotation mechanism) The anti-rotation mechanism 7
Are a resin fixing ring 8 provided on the inner wall of the casing 1 and a resin rotating ring 9 mounted on the shaft portion 2e.
It is composed of Of these, the fixing ring 8 has a pair of grooves 81 on the outer periphery, and is mounted in a state where the grooves 81 are engaged and positioned with the corresponding key portions 14 a provided on the inner peripheral mounting portion of the casing 1. A concave portion 8 a is formed on the inner periphery of the fixing ring 8 by a locking projection wall 82 and an elastic projection 83. The projecting dimensions of the locking projection wall 82 and the elastic projection 83 are set to be substantially the same, while the locking projection wall 82 is positioned wider on the bottom side of the groove 81 and is wider than the elastic projection 83. It is difficult to deform.

The rotating ring 9 has a pair of grooves 91 on the inner periphery, and the groove 9 is formed on a corresponding key portion 25 provided on the shaft portion 2e.
1 is fitted and positioned. An elastic projection 9 is provided on the outer periphery of the rotating ring 9 so as to removably engage with the recess 8a.
a is provided. The elastic convex portion 9a has a cutout portion 9 having an arc-shaped cross section immediately below it and having a part of the ring thickness removed.
2 so as to be elastically deformable through the elastic projections 8.
More deformed than 3 Here, the shape and the amount of protrusion of the elastic projection 9a are set to be substantially the same as those of the elastic projection 83, and the outer diameter of the rotating ring 9 (external shape excluding the projection 9a) is the innermost diameter of the fixed ring 8 (the locking projection wall 82). (Or the inner diameter including the elastic projection 83).

Incidentally, such a concave portion 8a and an elastic convex portion 9 are provided.
a, an elastic convex portion corresponding to the convex portion 9a and a cutout portion corresponding to the cutout portion 92 are provided on the inner periphery of the fixing ring 8, while a concave portion corresponding to the concave portion 8a can be provided on the outer periphery of the rotating ring 9. is there.

To assemble the above members, first, the seal member 3
Is fixed to the rotary wing 21, and the fixed ring 8 and the rotary ring 9 are mounted to the casing 1 and the shaft portion 2e. Then, with respect to the cylindrical chamber 14 of the casing 1,
The shaft 2 with the rotary wings 21 is incorporated with the sealing 41 interposed therebetween, and the lid 5 with the sealings 42 and 43 applied to the casing 1 as shown in FIG.
The holder 6 is assembled so as to cover the side. Also, a viscous fluid is filled from the inlet 12 and the inlet 12 is
It is completed by closing with.

(Damper Function) In the above-described fluid pressure damper, as shown in FIG. 1 (a) showing the state of the damper function, when the shaft 2 is rotated in the direction of the arrow, the fluid passage 22
Is always closed by the elastic valve portion 31. As a result, the viscous fluid moves exclusively through the fitting gap X between the partition wall 11 and the shaft 2, and operates with a braking force having a strength proportional thereto. In the process of the shaft 2 being rotated in the reverse direction, the viscous fluid enters the fluid passage 22 and presses the elastic valve portion 31 in the opening direction as indicated by the imaginary line in FIG. release. As a result, in addition to the fitting gap X, the viscous fluid
It is movable through the fluid passage 22 and operates with a proportionally weak braking force.

Since the seal member 3 is fixed to the tip surface of the rotary wing 21, only the outer surface of the sliding contact portion 33 of the seal member 3 in contact with the inner wall of the casing 1 is worn. For this reason, the quality of the sliding contact 33
It is only necessary to consider the thickness control and wear of its outer surface,
Relaxed in terms of accuracy. The elastic valve portion 31 swings and deforms only when the fluid pressure from the fluid passage 22 is applied.
Acts as a one-way valve releasing 2. Sealing member 3
Has a substantially 7-shaped cross section, the direction in which the braking force is obtained can be changed by changing the direction of attachment to the rotor 21.

(Rotation Stopping Function) In the rotation stopping mechanism 7 described above, when the shaft 2 rotates by a predetermined angle, the convex portion 9a of the rotating ring 9 is elastically deformed due to the presence of the notch 92, and the fixed ring 8 Is engaged with the concave portion 8a so as to be able to be disengaged from the elastic projection 83, the engaging force acts as a resistance to a rotational moment applied to the shaft 2, and the shaft 2 is prevented from rotating. That is, the rotation stopping mechanism 7 is configured such that the protrusion 9 a of the rotation ring 9 that rotates integrally with the shaft 2
a, the shaft 2 is strongly rotated against the engaging force between the convex portion 9a and the concave portion 8a to elastically disengage and release the rotation stop. In such a rotation stopping mechanism 7 of the shaft 2, for example, a lid (operating body) such as a valve seat connected to the shaft hole 24 via the shaft is in an open state, and the lid is inadvertently collapsed from this open state and closed. Used when there is no need.

In this configuration, the concave portion 8a is provided on the casing 1 side.
The fixed ring 8 is fixedly provided, while the rotating ring 9 with the convex portion 9a is mounted on the shaft 2 and is configured to rotate integrally, so that the ball biased by the coil spring is engaged with the concave portion. Unlike the conventional rotation stopping mechanism, it is not necessary to form a portion for accommodating a coil spring, and the protrusion 9a corresponding to a ball is formed integrally with the rotating ring 9 so that the number of parts can be reduced. Because of this, there is no problem such as rust, and since it can be formed to be thin, it is small in space and excellent in compactness. Also, JP-A-6-11
The structure is simpler than that of the structure of No. 1696, and the projection 9a has a cutout portion 92 in which a part of the ring thickness is removed.
The elastic properties of the protrusions 9a and the recesses 8a are less likely to be reduced due to the elastic deformation of the protrusions 9a.

The required characteristics of the rotation stopping mechanism 7 are considered to be slip characteristics, abrasion resistance and the like of the elastic projection 9a. In addition, elastic fatigue strength or durability, compressive strength, and the like caused by the elastic deformation structure are considered. In this regard, the elastic engagement / disengagement structure of the rotating ring 9 with respect to the concave portion 8a of the fixed ring 8 is described. When a convex portion 9a is provided on the outer circumference of the rotating ring 9 and a cutout 92 having a part of the thickness of the ring removed therefrom is provided directly below the convex portion 9a, a convex portion or a claw is provided on the outer periphery of the rotating ring 9 at the arm-shaped tip. It was confirmed that elastic fatigue was less likely to occur, and the durability was excellent, especially for those formed.

(Material Test) In the present invention, the above-described rotation stopping mechanism is manufactured by forming the fixing ring 8 and the rotating ring 9 with various kinds of resin materials, respectively, and incorporating the fixing ring 8 and the rotating ring 9 into a damper. As a result of examining the wear characteristics, the following remarkable performance differences were recognized depending on the material. Next, the representative configuration will be described.

Only the resin material of the fixed ring 8 and the rotating ring 9 is changed, and the other dampers are manufactured under the same conditions.
The combination was tested as shown in Table 1 below.

[Table 1] In Table 1, PA is a polyamide resin (nylon 6,
The same was true for both nylon 66. ), POM is polyoxymethylene (polyacetal) resin, PBT
Indicates a polybutylene terephthalate resin. In selecting the material, for example, PBT resin is POM
The combination was set because it is said that the resin has a good nickname, and the combination and other combinations were set because the PA resin had good fatigue characteristics. Also, PO
Combinations of M resins are generally excluded because their friction nickname is poor.

The test was performed 500 times and 1000 times with the opening and closing of the operating body once by the damper incorporating the samples 1 to 4.
The evaluation was performed in each state where the operation was performed 10,000 times, 20,000 times, 30,000 times, and 40,000 times. A representative example of this evaluation is shown on the right side of Table 1, and the operation cycle (times) and lock torque (Kgf-cm)
Was plotted in FIG. As shown in Table 1, although the deformation of the fixing ring 8 was slightly recognized at the time of 50,000 times in the sample 1, it was found that the lock torque was small and the high level could be maintained. On the other hand, in the samples 2 and 3, the fixing ring 8 and the rotating ring 9 in the sample 2 and the fixing ring 8 in the sample 3 were worn out at 30,000 times, and discoloration due to bending fatigue was remarkable. Sample 4 had an initial torque of 8
Although it was about Kgf-cm, the rotating ring 9 was particularly broken at the time of 500 to 1000 times. As described above, it has been found that the use of PA resin for both the fixing ring 8 and the rotating ring 9 can dramatically improve the quality of other resin materials and combinations of PA resin and other resin materials. did.

[0025]

As described above, in the fluid pressure damper according to the present invention, the rotation stopping mechanism can be employed with the minimum number of parts and the installation space, and the compactness and the assemblability are excellent and the performance is excellent. Can be realized at low cost.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a main part of a hydraulic damper according to one embodiment of the present invention.

FIG. 2 is a cross-sectional view of the hydraulic damper.

FIG. 3 is a view showing constituent members of a rotation stopping mechanism provided in the fluid pressure damper.

FIG. 4 is a diagram showing performance test results of Samples 1 to 3.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Casing 2 shaft 5 Lid 7 Rotation stopping mechanism 8 Fixing ring 8a Depression 9 Rotation ring 9a Convex part

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) F16F 9/14 F16F 9/56 A47K 13/12 E05F 3/14

Claims (1)

(57) [Claims] 1. A shaft having rotating blades is rotatably incorporated in a cylindrical chamber provided with a partition wall in a casing, and rotation of the shaft is braked by a viscous fluid to be filled, while the rotation of the shaft is braked. Are provided corresponding to the inner wall side and the shaft side, and are engaged with each other so as to be disengageable in the process of rotating the shaft, thereby rotating an operating body such as a lid connected to the shaft at a fixed position. In a fluid pressure damper provided with a rotation stopping mechanism for regulating, the rotor has a fluid passage, and a tip of the rotor is provided.
A sliding contact portion that covers an end surface and contacts the inner wall of the casing.
And a long strip-shaped elastic valve portion that covers one side opening of the fluid passage.
And a short piece-shaped locking portion hooked on the other side of the fluid passage
And a sealing member having a substantially 7-shaped cross-section
The rotation stopping mechanism is integrally formed of a polyamide resin fixing ring provided on the inner wall of the casing and a polyamide resin rotation ring mounted on the outer periphery of the shaft. One of the concave portion and the convex portion is formed integrally with the inner periphery of the fixed ring, and the other is formed integrally with the outer periphery of the rotating ring , and the convex portion is located just below the convex portion.
Shaped to be elastically deformable through a notch with a part of the thickness removed
A fluid pressure damper characterized by being formed .