JP2906309B2 - Damper mechanism - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to various types of hydraulic oils, in which a resistance is obtained by utilizing the pressure of the hydraulic oil, and the resistance exerts a buffering action against an external force, that is, a braking force. The present invention relates to an improvement in a damper mechanism that can be used for applications.

[0002]

2. Description of the Related Art Conventionally, as a damper mechanism of this kind,
As shown in FIG. 5, a cylinder a, a blade shaft b having a blade c sliding on the inner wall surface of the cylinder a, and an upper fixed bearing (not shown) for rotatably holding the blade shaft b in the cylinder a A first chamber A in which the inside of the cylinder d is vertically partitioned by the lower fixed bearing and the blades c;
A chamber B is known which includes a working oil e filled in each chamber.

[0003]

However, in the damper having the above-described structure, if a gap exists between the inner wall surface a 'of the cylinder a and the blade c, the gap is formed by the hydraulic oil e when the blade shaft b rotates. Will flow (leak), and the performance as a damper will be impaired. To prevent this, components such as the inner wall surface a 'of the cylinder a, the blade shaft b and the blade c are precision machined and assembled.

However, when the above-mentioned gap becomes zero,
Since the sliding of the blade c is not smooth, the processing accuracy is further severed and the productivity is significantly reduced in order to smooth the sliding and prevent the hydraulic oil from leaking.
In such a structure in which the blade c slides, the inner wall surface a 'of the cylinder a and the blade c are inevitably worn, and their durability is poor.

Therefore, recently, in order to alleviate the strictness of the processing accuracy, the blade c is provided with a flexible member f such as rubber or the like, and a flexible seal member is attached to the blade c to reduce the leakage of hydraulic oil. Prevention has also been proposed. By doing so, the processing accuracy of the parts is eased, and the assembly becomes easy. However, by reducing the processing accuracy, if the roughness of the sliding surface becomes large, the durability of the flexible member and the seal member becomes poor. Will be reduced.

In this type of damper, FIG.
As shown in the figure, the oil passage hole h passes through the fixed blade g fixed to the outside of the blade c, and the check valve i must be disposed in the oil passage hole h. There is also.

Therefore, in order to solve the above-mentioned conventional problems,
As shown in FIG. 6, a movable shaft k is rotatably supported in a cylinder j, and a spherical check valve body n is mounted in a recessed space l of the movable shaft k via a spring m to thereby form a movable shaft k. k
When but that is rotated as shown by the arrow R ₁ as shown in FIG (A), by a spherical check valve body n being pressed by the spring m is in sliding contact with the inner wall surface 0 of the cylinder j, the operation of the cylinder j oil p is the cut-off state, if rotation is movable shaft k arrow R ₂ direction as shown in FIG. (B), hydraulic fluid p
Has been proposed that pushes the spherical check valve body n against the elasticity of the spring m so that the hydraulic oil p flows through as shown by the arrow q (Japanese Patent Laid-Open No. 3-24346). .

However, when the check valve is configured as described above, the spherical check valve body n is moved by the spring m to the cylinder j.
Because it comes into sliding contact with the inner wall 0 while strongly pressing, the problem of abrasion cannot be solved, and with the use of the spring m, satisfactory results can be obtained in terms of durability and operation reliability. I can't get it.

Based on the above-mentioned deficiencies of the various conventional examples, the present applicant has already proposed a damper mechanism as shown in FIG. 4 (Japanese Patent Application No. 3-190740). In this case, a movable shaft 2 rotatable by an external force is axially mounted in the cylinder 1, and an arc-shaped bearing recess 2 a provided on the movable shaft 2 has
The cylindrical base 3a of the movable valve 3 is fitted so as to be freely rotatable,
The valve portion 3b of the movable valve 3 tapered from the cylindrical base portion 3a is slidable on the inner wall surface 1a of the cylinder 1.

[0010] Therefore, when the rotation in the arrow D ₁ direction of the movable shaft 2, in an open valve state away from the inner wall surface 1a valve portion 3a of the movable valve 3 is in pressure by hydraulic oil 4, anti to the rotation of the movable shaft 2 The resistance of the operating oil 4 does not act. During rotation in the arrow D ₂ reverses direction, since the working oil 4 rotates the movable valve 3 so that the valve portion 3b is pushing the inner wall surface 1a, is closed liquid-tight state is secured, this time, hydraulic oil Numeral 4 only flows into the second chamber 1c from the first chamber 1b in the cylinder 1 via the narrow passage 5, so that the damping effect of the hydraulic oil 4 is exerted.

In the case of the above, the valve is opened and closed by rotating the movable valve 3 itself without using a spring, so that the valve portion 3a is pressed against the inner wall surface 1a more than necessary and becomes worn. It is possible to completely eliminate bearings such as durability and detachment of the spring, and a liquid-tight sliding contact between the movable valve 3 and the inner wall surface 1a can be ensured for a long time with high reliability.

However, as in the case of the movable valve 3, a tapered valve portion 3b is projected from the cylindrical base portion 3a, and the distal end side of the outer peripheral surface portion 3c is slidably contacted with the inner wall surface 1a, and the arrow D _2. rotation of the movable shaft 2 in the direction, the valve portion 3b when going to rotate in the arrow D ₂ direction while being pressed by the hydraulic fluid 4, the tip portion of the valve portion 3b is strongly pressed to the inner wall surface 1a becomes wedge, As a result, it has been found that a phenomenon occurs in which the smooth rotation of the movable shaft 2 is hindered.

The present invention has been made in view of the above-mentioned problems, and by appropriately correcting the shape of the outer peripheral surface of a movable valve, the phenomenon based on the wedge-like action described above does not occur, so that the movable shaft can smoothly move. It is an object of the present invention to ensure a proper rotation and to secure a liquid-tight sliding contact between the movable valve and the inner wall surface of the cylinder for a long period of time.

[0014]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a movable cylinder which is rotated inside a cylinder together with a movable shaft rotatable by an external force and slides on the inner wall surface of the cylinder by the rotation. valve is fitted arranged so as to be rotatable on one side of the movable shaft, half of the movable valve and the cylinder
The radially projecting partitioning section allows the cylinder
When the interior is defined in the first and second chambers filled with hydraulic oil,
And a narrow passage communicating the first and second chambers to the partition.
When the movable valve is rotated together with the movable shaft, the movable valve separates from the inner wall surface of the cylinder depending on the forward / reverse direction of the rotation or rotates in the contact direction, and each of the movable valves is in a valve-opening operation state.
Alternatively, a valve portion is formed in which the pressure of the hydraulic oil is applied in a direction of the valve closing operation state, and the movable valve is rotated in an arc-shaped shaft recess provided on the movable shaft in parallel with the rotation direction of the movable shaft. a cylindrical base portion which is fitted so as to be freely, is provided continuously thereto, it consists of a supra valve portion of the sliding freely tapering outer peripheral surface portion which is a突弧shape on the inner wall surface of the cylinder, on the outer peripheral surface
And the part that slides on the inner wall surface of the cylinder and the cylinder
At the boundary with the non-contact point on the inner wall surface
The base end portion is formed at a position where an arc toward the front end passing through the base end portion is directed outward from the inner wall surface of the cylinder by the rotation center of the cylindrical base portion. It is intended to provide.

[0015]

When an external force is applied to the movable shaft as a rotational force, and the movable shaft is rotated, the movable valve pivotally mounted on the movable shaft also revolves in the same direction. When the movable shaft is rotated in one direction, one of the first and second chambers in which the inside of the cylinder is partitioned by the movable valve and the partition wall and which is filled with hydraulic oil is provided.
The movable valve is pressed and self-rotated by the pressure based on the hydraulic oil in a certain second chamber, whereby the movable valve is rotated inward, that is, in a direction away from the inner wall surface of the cylinder, and as a result , a gap is formed between the movable valve and the inner wall surface of the cylinder. It is formed. In other words, the movable valve is in the valve-opening operation state, and the hydraulic oil in the first chamber flows into the other second chamber through the gap, so that the hydraulic oil does not generate a resistance as a damper effect.

Next, when the movable valve revolves in the opposite direction together with the movable shaft, the movable valve is pressed by receiving the pressure of the hydraulic oil in the first chamber, and rotates outwardly, thereby rotating the cylinder. The movable valve comes into close contact with the wall surface, and the movable valve enters a valve closing operation state. As a result, the hydraulic oil in the first chamber does not flow into the second chamber through the space between the inner wall surface of the cylinder and the movable valve , and the first chamber communicates with the second chamber through the narrow passage. The hydraulic pressure in one chamber is increased, and a resistance force due to the hydraulic oil is generated, and a damper effect is exerted on the external force of the movable shaft. At this time, the movable valve
On the outer peripheral surface of the valve section
The base end, which is the boundary between the sliding and non-sliding locations, is a circle
The arc passing through the base end by the rotation center of the columnar base is
Position it so that it is directed outward rather than inward from the inner wall
Is selected, so the tip of the valve is
Smooth rotation of the movable shaft without being strongly pressed by the wall
Will be guaranteed.

At this time, the hydraulic oil in the first chamber flows into the second chamber through the above-mentioned narrow passage. If the above-described narrow passage is freely adjustable, the flow rate is adjusted thereby, and the resistance is reduced. The magnitude of the force can be controlled. In the above description, the case where the cylinder is fixed and the movable shaft is rotated has been described. On the contrary, the movable shaft may be fixed and the cylinder may be rotated. Achieved.

[0018]

Embodiments of the present invention will be described below with reference to the drawings. As shown in FIG. 1, a movable shaft 20 is mounted in a cylinder 10 so as to be rotatable about an axis 21 by an external force.
The inner wall surface formed in a cylindrical shape of
Is a partition 10 protruding from the cylinder 10 in the radial direction.
a. On one side of the outer periphery of the movable shaft 20, a bracket 22 is provided in the cylinder 1 in the radial direction.
0, the bracket 22 is provided with a bearing recess 23 at the center of the distal end thereof so as to have a substantially semicircular planar shape and open toward the inner wall surface 11 side of the cylinder 10. Have been.

The separately prepared movable valve 30 is formed integrally with a cylindrical base 31 at a base end thereof and a valve portion 32 protruding from one side in a substantially radial direction. The movable valve 30 is supported by the movable shaft 20 so as to be freely rotatable in parallel with the direction around the axis by fitting the columnar base 31 into the shaft bearing recess 23, whereby the movable valve 30 is movable. By revolving together with the shaft 20, the valve portion 32 can slide freely on the inner wall surface 11 of the cylinder 10.

Further, the valve portion 32 of the movable valve 30, a concave arc-shaped surface 33 on the inner surface which is the one movable shaft 30 side is, in the outer surface which is the other of the inner wall surface 11 side, a circular outward The arc-shaped outer peripheral surface portions 34 are provided respectively, so that the arc-shaped outer peripheral surface portion 33 can be slidably contacted with the inner wall surface 11 of the cylinder 10 so as to be able to freely contact and separate therefrom. The inside of the cylinder 10 is in front of the movable valve 30.
The first chamber 41 and the second chamber 42 are defined by the partition 10a.
Specifications cut is possible and results in two, hydraulic oil 50 is filled in these chambers.

When the movable valve 30 is rotated in the clockwise direction indicated by the arrow E _{1 in} FIG. 1 together with the movable shaft 20, the concave arc-shaped surface portion 33 of the valve portion 32 causes the hydraulic oil 50 in the first chamber 41 to move. It would be subject to direction of arrow F ₁ of the illustrated pressure, the movable valve 30 is pressed rotated counterclockwise, the outer peripheral surface portion 34 in the valve portion 32, the inner wall surface of the cylinder 10 as shown by the solid line in FIG. 1 11 and the valve closing operation state is established. As a result, the hydraulic oil 50 inside the first chamber 41 does not flow into the second chamber from between the inner wall surface 11 and the movable valve 30, and the movable valve 30 slides on the inner wall surface 11. In this case, the hydraulic oil 50 in the first chamber 41 flows to the second chamber 42 through a narrow passage 60 described later in detail.

Further, the movable valve 30 together with the movable shaft 20, when rotated in the counterclockwise direction indicated by the arrow E ₂ in FIG. 1,
Outer peripheral surface 34 of the valve portion 32, the operating oil inside the second chamber 42 5
Under pressure of 0 to arrow F ₂ direction shown, thereby, the movable valve 30 is pressed rotated clockwise, the valve portion 3
2 is separated from the inner wall surface 11 of the cylinder 10 and is in a valve-opening operation state as indicated by a dashed line in FIG. 1 (A), and a gap is formed between the inner wall surface 11 and the movable valve 30. The hydraulic oil 50 inside the second chamber 42 flows into the first chamber 41 through the gap.

In the case where the movable shaft 20 is fixed and the cylinder 10 is rotated, the cylinder 10 shown in FIG.
Is rotated in the direction of the arrow E ₁ ′, whereby the movable valve 30 is brought into the valve closing operation state, and when it is rotated in the direction of the arrow E ₂ ′, the movable valve 30 is brought into the valve opening operation state.

In the present invention, furthermore, in the valve portion 32 of the movable valve 30 described above, consideration is given to the shape of the arcuate outer peripheral surface portion 34.
A place that comes into sliding contact with the inner wall surface 11 of the cylinder 10
And non-sliding contact with the inner wall surface 11 on the cylindrical base 31 side
The arrangement position of the base end portion 34 ′ at the boundary with the point 35 is regulated as follows. That is, when the arc G ₁ passing through the base end portion 34 ′ is drawn toward the distal end side of the valve portion 32 with the radius r ₁ around the rotation center 35 of the cylindrical base portion 31, the arc G ₁ becomes It is directed outward from the inner wall surface 11.

[0025] Now, if only the outer peripheral surface at the distal end side shown in FIG. 1 (B) was in the valve portion 32 is in sliding contact with the inner wall surface 11, and selects the base end portion of the outer peripheral surface at a position of H, the non
Assuming that the contact point H 'is bent as shown by a two- dot chain line,
At this time, when drawing an arc G ₂ passing through the base end portion H with a radius r _{2 about the} rotation center 35, the arc G ₂ is directed inward from the inner wall surface 11 , and the outer periphery in the present invention described above This means that the necessary conditions of the surface portion 34 are not satisfied.

Further, on one side of the cylinder 10,
In order to adjust the flow rate when the hydraulic oil 50 in the first chamber 41 and the second chamber 42 flows to each other, the narrow passage 60 can be adjusted in a wide and narrow manner as described below. That is, as shown in FIG. 1 (A), the cylinder 10 is provided with an oil passage 61 for communicating the first and second chambers 41 and 42 having variable volumes as described above. A screw hole 62 is provided in the oil passage 61, and an adjusting screw 63 for adjusting the amount of oil is screwed through an O-ring 64, and an oil amount adjusting member 65 is fitted to the end of the screw. A rear end of the adjusting member 65 and a bottom portion 61 ′ that is the cylinder 10 of the oil passage 61.
A compression spring 66 is interposed between the adjusting screw 63
Is operated such that the narrow passage 60 formed in the oil passage 61 can be adjusted to be wide and narrow.

More specifically, the adjusting screw 63 is composed of a head 63a, a threaded portion 63b, a tapered taper portion 63c, and a fine rod 63d, which are sequentially connected to each other. The cylindrical portion 65a of the adjusting member 65 is fitted, and the base flange portion 65b of the cylindrical portion 65a and the cylinder 1
0 between the receiving shoulder 10b and the oil passage 61.
The narrow passages 60 are formed apart from each other.

Therefore, by rotating the adjusting screw 63 in the reverse direction, the narrow passage 60 can be adjusted in a wide and narrow manner. As a result, the narrow passage 60 flows from the first chamber 41 to the second chamber 42. Not only can the flow rate of the working oil 50 to be adjusted to an arbitrary value, but also the oil amount adjusting member 65 is not a simple annular plate but a base flange portion 65b formed by a cylindrical portion 65a projecting therefrom. Since the slide plate is slid while being guided by the thin rod 63d, the mere annular plate does not become orthogonal to the axis due to the elasticity of the compression spring 66 and does not become eccentric. The adjustment can be performed with high reliability.

Therefore, in the above embodiment, the movable shaft 20
And the cylinder 10 are relatively rotated.
When the above as example of the movable shaft 20 is rotated in the direction of arrow E _1, in proportion to the sizes of said as Hososukiro 60, the damper effect based on the hydraulic oil 50 is exhibited, in the opposite direction of arrow E ₂ When the movable shaft 20 rotates, the damper effect is not exhibited. Here, in the present invention in cases where the damper effect is exhibited, in Rukoto is selected the group terminal end 34 of the outer peripheral surface 34 'of the movable valve 30,
Since the arc G ₁ of the is directed to the outside of the inner wall surface 11, it will bite into the wedge-shaped valve portion 32 against the inner wall surface 11, resulting in inhibition movable valve smooth rotation of the movable shaft 20 itself Such a phenomenon is suppressed.

Next, in the embodiment shown in FIG. 2, cutouts 34a and 34b are formed in the outer peripheral surface portion 34 of the movable valve 30 in two upper and lower stages. The front portion 34c of the portion 32 is formed in a front E-shape by horizontal portions 34d, 34e, and 34f provided horizontally in upper, middle, and lower stages.

[0031] The notches 34a, by providing the 34b, when the movable shaft 20 as shown in FIG. 3 (A) is rotated in the arrow E ₁ direction, the tip portion 34c in the outer peripheral surface 34 is in sliding contact with the inner wall surface 11 first by, distribution blocks the second chamber 41 and 42, when the movable shaft 20 is rotated in the arrow E ₂ direction, the hydraulic oil 50 in the second chamber 42 as shown Figure 3 (B),
It flows into the notches 34a and 34b, and it is convenient to reliably separate the movable valve 30 from the inner wall surface 11. Further, when the movable valve 30 rotates clockwise from the state of FIG. 3A as shown in FIG.
4, the horizontal portions 34d, 34e, 34f
1, the hydraulic oil 50 in the second chamber 42 can flow into the first chamber 41 via the notches 34a and 34b.

Further, the reference numeral 12 shown in FIG.
Shows a guide ridge projecting from the inner wall surface 11 of the cylinder 10 in the circumferential direction.
When There rotated arrow E ₂ direction, notch 34 of the movable valve 30
b is inserted, and as a result, the inner peripheral surface 12a of the guide ridge 12 comes into sliding contact with the arc-shaped bottom curved surface 34b 'of the cutout portion 34b. Means that the movable valve 30 is held away from the inner wall surface 11, so that the movable shaft 20 is
Even if the movable valve 30 is rotated in the direction of ₁ ,
Until the movable valve 30 is disengaged from the movable valve 30, there is no clockwise rotation, so that the damper effect is not unintentionally exerted.

[0033]

Since the present invention is constructed as described above, the movable valve is rotated together with the movable shaft, and is pressed and rotated by the operating oil in the cylinder according to the direction of rotation, thereby opening the valve. Since the operation state or the valve closing operation state is achieved, the machining accuracy of the inner wall surface of the cylinder and the movable valve can be relaxed. In addition, by adding one movable valve, the blade and the check valve in the conventional example are provided. Since both functions can be satisfied, the structure can be simplified and the manufacturing cost can be reduced. In addition, even if the inner wall surface of the cylinder and the portion in contact with the movable valve are worn, the amount of wear is complemented by the degree of rotation of the movable valve, and a satisfactory result can be obtained in terms of durability.

Further, in the present invention, the position of the base end portion on the outer peripheral surface of the movable valve is specified. Therefore, when the damper effect is to be exerted, the movable valve and the inner wall surface of the cylinder are required. Can be prevented from slipping smoothly.

[Brief description of the drawings]

FIG. 1A is a cross-sectional plan view of an essential part showing an embodiment of a damper mechanism according to the present invention, and FIG.

FIG. 2 is a perspective view of a main part showing another embodiment in which a movable valve different from that in FIG. 1 is used.

3A is an explanatory plan view showing a valve closed state when the movable valve of FIG. 2 is used, and FIG. 3B is an explanatory plan view showing the valve open state;

FIG. 4 is a cross-sectional plan view of an example showing a conventional damper mechanism.

FIG. 5 is a cross-sectional plan view showing a conventional damper mechanism.

FIG. 6 (A) is a plan view of a principal part in a closed state showing a conventional different type damper mechanism, and FIG. 6 (B) is a plan view of a principal part showing a valve open state of the same.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 Cylinder 10a Partition part 11 Inner wall surface 20 Movable shaft 23 Bearing recess 30 Movable valve 31 Cylindrical base 32 Valve 34 Outer peripheral surface 35 Non-contact location 34 'Base end 41 First chamber 42 Second chamber 50 Hydraulic oil 60 Fine Gap G ₁ arc

Claims (1)

(57) [Claims] 1. A movable valve, which is rotatable in a cylinder together with a movable shaft rotatable by an external force and slides on an inner wall surface of the cylinder by the rotation, is fitted and disposed so as to be rotatable on one side of the movable shaft. The movable valve and half of the cylinder
The radially projecting partitioning section allows the cylinder
When the interior is defined in the first and second chambers filled with hydraulic oil,
And a narrow passage communicating the first and second chambers to the partition.
When the movable valve is rotated together with the movable shaft, the movable valve separates from the inner wall surface of the cylinder depending on the forward / reverse direction of the rotation or rotates in the contact direction, and each of the movable valves is in a valve-opening operation state.
Alternatively, a valve portion is formed in which the pressure of the hydraulic oil is applied in a direction of the valve closing operation state, and the movable valve is rotated in an arc-shaped shaft recess provided on the movable shaft in parallel with the rotation direction of the movable shaft. a cylindrical base portion which is fitted so as to be freely, is provided continuously thereto, it consists of a supra valve portion of the sliding freely tapering outer peripheral surface portion which is a突弧shape on the inner wall surface of the cylinder, on the outer peripheral surface
And the part that slides on the inner wall surface of the cylinder and the cylinder
At the boundary with the non-contact point on the inner wall surface
The base end portion is formed at a position where an arc toward the tip end passing through the base end portion is directed outward from the inner wall surface of the cylinder by the center of rotation of the cylindrical base portion. .