JP2002039454A - Connecting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a connecting device of two members such as piping elements, having high reliability and high workability in connection and free from loosening or the like. SOLUTION: This connecting device has locking hook parts 9 respectively formed on side faces of plural engagement projecting parts 8 axially projecting from a tip part of an engagement member mounted on an end part of a piping element, and relatively engaged in the circumferential direction to control the axial movement, edge parts 22 free from overhang are respectively partially formed on the engagement faces of the locking hook parts 9, the other parts 21 are formed into the overhang shape, and the edge parts 22 are circumferentially engaged at an initial period of the engagement, and deformed when the load is acted in the engagement state, whereby the other overhang- shaped parts 21 are engaged.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a two-member connecting device, such as a piping element, which has a simple structure, is easy to connect, and has high reliability. More specifically, the present invention relates to a connecting device in which locking hooks formed on the side surfaces of fitting projections that are fitted in the axial direction are engaged with each other to regulate the movement in the axial direction. It is an object of the present invention to provide a connection device that can more reliably maintain the engagement state of the above-mentioned locking hook portion without impairing the performance.

[0002]

2. Description of the Related Art Conventionally, as a device for connecting two members, for example, piping elements of a hydraulic system, a joint device fastened by a screw has been widely used. Although such a coupling device has a simple structure, it has essential problems such as easy loosening.

[0003] That is, in the fastening by the screw, this fastening state is maintained by the frictional force generated between the threads of the male screw and the female screw by the elastic force of each part generated by the tightening. When a vibration or the like acts on the screw in such a fastened state, the male screw and the female screw may rotate relatively, albeit minutely, due to the inertial force of each part due to the vibration. In this case, the turning resistance in the tightening direction of the screw is large, but the turning resistance in the loosening direction is small. In general, the inertial force generated by vibration is equal in both the forward and reverse directions, but since the rotational resistance of the screw differs depending on the direction as described above,
The amount of rotation in the loosening direction tends to be larger. For this reason, when vibration or the like acts for a long period of time, the screws are gradually loosened. Such fastening with screws is a common problem in general when not only connecting devices for piping elements but also various members are fastened and connected by screws.

[0004] In order to reduce such loosening of the screw, a spring washer is interposed, but the tendency of the loosening of the screw cannot be essentially eliminated. Although there is a countermeasure for fixing with a safety wire or the like after the screw is fastened, there is a problem in that the safety wire hooking operation is troublesome and inefficient.

In order to solve such a problem, locking hooks are formed on the side surfaces of the fitting projections which are fitted in the axial direction, and the locking hooks are engaged in the circumferential direction so as to be engaged in the axial direction. There has been considered a joint device that restricts the movement of the joint and sets the joint in a fastened state. Due to the friction of the engaging surfaces of these hooks,
Although the engagement member is maintained in the fastened state by preventing the relative rotation of the fitting member, since the locking surface is engaged in the direction along the circumferential direction, it is essentially either forward or reverse. About
The rotation resistance can be made equal. As described above, since the inertial force generated by the vibration is equal in both the forward and reverse directions, the vibration does not tend to cause the fitting members to preferentially rotate in one direction. Therefore, loosening due to vibration can be reliably prevented.

However, in order to more reliably prevent the engagement of the locking hooks from being loosened, the engaging surface of the locking hook is inclined so that the distal end edge thereof is located on the base end side. That is, it is preferable to form an overhang. When such an overhung locking hook is engaged, the engaging surfaces of the locking hooks are engaged with each other by an axial biasing force of a biasing means such as a spring, so that loosening can be prevented. .

However, if these locking hooks are formed in an overhanging shape as described above, in order to engage these locking hooks, the fitting member must be brought closer by an amount corresponding to the overhang. Workability is impaired. In particular, when an urging member having a metal lip portion that also functions as a seal and an urging member is used, such as a connection device for a piping element of a hydraulic system, the elastic deformation stroke is reduced. The connection operation is troublesome because the elastic force is large as well as small.

[0008] If the engaging surface of the locking hook is not made overhanging, but is made to be a surface along the circumferential direction, that is, without overhanging, connection work becomes easy. Even with such a configuration, as described above, the connection device can be prevented from being loosened due to vibration or the like.

[0009] However, in a device such as an aerospace connection device for hydraulic or other piping elements that is exposed to strong vibrations or severe conditions and requires high reliability, higher measures for preventing loosening are required. Becomes

[0010] In addition to the special connection device as described above, generally, if the overhang of the locking hook is strengthened, the effect of preventing loosening increases, but on the other hand, the operability at the time of connection is reduced. For example, the loosening prevention and the ease of the connection work are in conflict with each other.

[0011]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has a simple structure, good operability in connection work, and a possibility of loosening of engagement. It is another object of the present invention to provide a highly reliable connection device.

[0012]

According to a first aspect of the present invention, there is provided a connecting device for connecting a first member and a second member to be connected to each other in a state of facing each other.
And a first piping element provided at an end of the second piping element, respectively.
And a second fitting member, a plurality of fitting protrusions protruding in the axial direction from the distal ends of these fitting members, and the fitting protrusion and the shaft formed between the fitting protrusions. And a first concave portion formed on a side surface of the first fitting protrusion.
A locking hook that engages with the second fitting member by rotating relatively in the circumferential direction to restrict the movement in the axial direction; Biasing means for biasing the fitting members in the direction of separating from each other to maintain the engagement state of the locking hooks, wherein the engaging surfaces of the locking hooks which engage with each other are When a load is applied in a direction in which the fitting members are separated from each other, the fitting members are deformed into an overhanging shape that meshes with each other.

Therefore, when an axial load is applied due to the internal pressure in the urging means or the piping element or other load, the engaging surfaces of the locking hooks are engaged with each other in an overhanging shape due to deformation. Looseness of engagement can be prevented, and high reliability can be obtained.

[0014] Further, since this is engaged in an overhang shape due to the axial load as described above, the amount of overhang of the engaging surface of these locking hooks is reduced by that much, or the amount of overhang is reduced. Is zero, that is, there is no overhang, and the workability at the time of connection is not impaired.

According to a second aspect of the present invention, in the engagement surface of the locking hook, at least a portion of the engaging surface is formed to have an overhang amount larger than that of the other portion. When the other part is deformed by the load, the part having the large overhang amount is engaged with the other part. Therefore, the present invention can be easily implemented by slightly changing the shape of the engaging surface of the locking hook, and the structure is simplified without any special parts.

According to a third aspect of the present invention, the other portion of the engagement surface of the locking hook has an overhang amount of zero when no load is applied. It is assumed that. Therefore, when performing the connection operation, that is, when no load is acting, the engagement hooks can be engaged only by relatively moving these hooks in the circumferential direction. Therefore, there is no need to unnecessarily bring the fitting member close to the axial direction, and the work becomes easy.

According to a fourth aspect of the present invention, when the load is applied, the engaging surface of the locking hook has a large deformation at a root portion and a small deformation at a distal edge portion. , So that they are deformed into overhangs and mesh with each other. Therefore, it is not necessary to form a special shape for the engaging surface of the locking hook, and the structure is simple and the manufacturing is easy.

The present invention according to claim 5 is characterized in that the locking hook is formed such that the front edge of the engaging surface is higher in hardness than other portions. Things. Therefore, it is not necessary to make a special shape for the engaging surface of the locking hook portion. For example, it is only necessary to perform a process of hardening only the tip end portion of the locking hook portion, such as induction hardening. Simple and easy to manufacture.

According to a sixth aspect of the present invention, the engagement surface of the locking hook has an overhang amount of zero when no load is applied. is there. Therefore, when performing the connection operation, that is, when no load is acting, the engagement hooks can be engaged only by relatively moving these hooks in the circumferential direction. Therefore, there is no need to unnecessarily bring the fitting member close to the axial direction, and the work becomes easy.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. 1 to 3 show a first embodiment of the present invention, which is a connection requiring high reliability as two members to be connected, for example, a connection device for a piping element of a hydraulic system of an aircraft. It is suitable for the device.

In the figure, reference numerals 1a and 1b denote first and second piping elements to be connected, and in this embodiment, hydraulic piping. Although the first pipe 1a and the second pipe 1b have the same diameter, the same applies when pipes having different diameters are connected or when other pipe elements are connected.

In the drawing, reference numeral 2 denotes these pipes 1a and 1b.
Is a fitting member for connecting in a state where they are abutted with each other. In the case of this embodiment, these fitting members 2 are of the same shape which complementarily fit each other.

The fitting member 2 has an annular main body 3, and a plurality of the main body 3 are provided from the tip end surface thereof.
A plurality of fitting protrusions 8 are integrally provided, and a fitting recess 7 is formed between the fitting protrusions 8. Since the fitting members 2 are complementary as described above, the fitting protrusions 8 are fitted in the fitting recesses 7 of the mating member 2 of the mating member 2 in the axial direction. A predetermined gap is formed in the direction, and these fitting members 2 are rotatable relative to each other by a predetermined angle in the circumferential direction.

Further, on one side surface of each of the fitting projections 8 described above,
Locking hooks 9 are respectively formed, and these locking hooks 9 engage with the locking hooks 9 of the fitting protrusion 8 of the mating member 2 of the mating member 2 along the circumferential direction. The movement of the fitting member 2 in the direction away from each other in the axial direction is restricted. The shape and the like of these hooks 9 will be described later.

The fitting projection 8 has a tapered shape such that the width in the circumferential direction becomes narrower toward the distal end side, and is configured to facilitate fitting with each other. I have. Further, one side surface thereof, that is, the side surface on which the above-mentioned locking hook 9 is formed is along the axial direction.

The first and second pipes 1a, 1a,
A biasing member 10 is provided at each of the distal end portions of 1b. In the case of this embodiment, these urging members 10
Is formed integrally with the distal ends of the pipes 1a and 1b.

The biasing member 10 is formed of an elastic metal material, and has a conical lip portion 12 protruding toward the distal end.
It has. When these lip portions 12 are pressed against each other in the axial direction, the lip portions 12 are elastically deformed as shown in FIG. 2 so that the pipes 1a and 1b are separated from each other in the axial direction by the elastic force. Energize.

Incidentally, In the case of this embodiment, the lip portions 12 of these biasing members 10 are configured so as to maintain a liquid-tight or air-tight state by being in close contact with each other. The urging member 10 is also used as a seal member for maintaining the seal between the pipes 1a and 1b.

A step 11 is formed on the outer periphery of the end of each of the pipes 1a and 1b, and the annular main body 3 of the fitting member 2 is fitted into the step 11. I have. Therefore, these fitting members 2 are connected to these pipes 1a, 1b.
Is mounted so as to be rotatable and restrict axial movement toward the distal end.

With such a connecting device, the pipes 1a, 1b
Are connected, first, the ends of the pipes 1a and 1b and the fitting member 2 are coaxially opposed to each other. Then, the fitting members 2 are brought close to each other, and the fitting projections 8 are fitted in the fitting recesses 7 in the axial direction. At the same time, the ends of the pipes 1a and 1b are close to each other, and the lip portion 12 of the urging member 10 at the distal end thereof comes into contact.

When the fitting member 2 is further moved closer from this state, the lip portion 12 is elastically deformed as shown in FIG. When the fitting member 2 is relatively rotated in this state, the locking hooks 9 of the fitting projections 8 are engaged with each other in the axial direction, and the fitting member 2 and the pipes 1a, The movement in the axial direction such that 1b is separated is restricted.

In this case, the elastic force of the lip portion 12 of the urging member 10 urges the fitting members 2 strongly in directions away from each other. This load acts on the engagement surface of the hook 9 and restricts the engagement members 2 from rotating relative to each other due to the frictional force, thereby preventing the engagement of the hook 9 from being released. In this way, as shown in FIG. 2, the connection of these pipes 1a and 1b is completed. When the connection of the connection device is released, the reverse operation is performed.

When vibration or the like acts on a portion of the connection device in this connection state, a load is applied in a direction in which the fitting members 2 rotate relative to each other due to the inertial force of each portion. When the vibration is strong, the engagement surface of the locking hook 9 may relatively move by a small distance in the rotation direction, that is, the circumferential direction, as described above.

However, in this embodiment, since the engagement of the locking hooks 9 is an engagement in a direction along the circumferential direction,
A frictional force in a direction in which the locking hooks 9 are more strongly engaged;
The frictional forces in the direction in which the engagement of the locking hooks 9 is released are equal to each other. As described above, the inertial force due to the vibration is equal in both the forward and reverse rotation directions of the fitting member 2. Therefore, unlike the conventional screw fastening, the frictional force has no directionality, and the engagement of the locking hooks 9 does not undesirably loosen due to vibration or the like, and the reliability is high.

In this embodiment, the structure is simple and the cost is low, and the connection and disconnection operations are simple. Further, since there is no loosening due to vibration or the like, it is not necessary to hook a safety wire or the like as in the case of the conventional fastening with screws.

The above connection operation can be performed manually, but a connection tool as shown in FIGS. 7 and 8 is used to make the operation easier. This connection tool includes a pair of levers 51 pivotally attached to each other. Further, holder members 52 and 53 are attached to the distal ends of these levers 51.

An inner cylinder 54 is provided in one of the holder members 53. On the outer peripheral surface of the inner cylinder 54, for example, a thread 56 of a reverse thread is formed. (Not shown). A holder 55 is formed at the tip of the inner cylinder 54.
The inner cylinder 54 is urged by a leaf spring 57 and a pin 58, and is urged to return to the original rotation position when the inner cylinder 54 rotates.

The holder members 52 and 53, the inner cylinder 54, the holder portion 55, and the like have a shape in which a part of the ring is cut off as shown in FIG. The fitting member 2 can be fitted.

When a connection operation is performed using such a connection tool 50, the holder member 52 of the connection tool 50 is used.
By fitting the holder 55 to the back side of the fitting member 2 and grasping the lever 51, the fitting members 2 can be brought close to each other with a strong force. Then, the inner cylinder 54 is rotated by the axial pressing force, the fitting member 2 is relatively rotated, and the locking hook 9 is automatically engaged. When the connection is completed and the pressing of the lever 51 is released, the inner cylinder 54 is rotated to the original position by the leaf spring 57.

By using such a connection tool 50, even when the elastic force of the lip portion 12 of the urging mechanism 10 is strong, the connection device can be easily connected. In the case of removing the connecting device, it is possible to use a tool in which the thread direction of the inner cylinder is reversed.

In this embodiment, the shape of the locking hook 9 is configured as shown in FIG. 3 in order to more reliably prevent loosening and improve workability in connection. ing. In addition, FIG. 3 shows a front view of the fitting projection 8 viewed from the axial direction at the center thereof, a side view viewed from the outside on the left side, and a side view viewed from the inside on the right side. .

First, as described above, the locking hook 9
In order to prevent the loosening of the engagement, it is preferable that the engagement surface of the locking hook portion 9 has an inclined shape such that the distal end edge is located on the base end side, that is, an overhang shape. . When such an overhang-shaped locking hook 9 is engaged, the locking hook 9 is engaged with the urging force of the urging mechanism 10 in the axial direction, so that loosening can be prevented.

However, if these locking hooks 9 are overhanging as described above, in order to engage these locking hooks 9, the fitting member 2 is moved closer by an amount corresponding to the overhang. Workability is impaired. In particular, when the urging member 10 having the metal lip 12 is used as in this embodiment, the elastic deformation stroke is small and the elastic force is large. Become.

If the engaging surface of the locking hook 9 is not overhanging but is formed along the circumferential direction, the connection work becomes easy. Also, even with this configuration, as described above,
Looseness due to vibration or the like of the connection device can be prevented.

However, in a device such as an aerospace connection device for hydraulic or other piping elements which is exposed to strong vibrations or severe conditions and requires high reliability, a higher measure for preventing loosening is required. Becomes

In this embodiment, in order to satisfy the above condition, the locking hook 9 is configured as follows.
That is, the locking hook 9 is formed with a curved portion 20 formed of a cylindrical surface in order to reduce stress concentration at the root of the hook. In this embodiment, the curved portion 20 is formed to be inclined with respect to both the axial direction and the circumferential direction of the fitting member 2. Preferably, the tip edge 23 of the locking surface of the locking hook 9 is set at the inclination angle or the like with respect to the axial direction and the circumferential direction along the circumferential direction.

With such a configuration, at the one end edge 22 of the curved portion 20, this edge, that is, the edge of the engagement surface extends along the circumferential direction and is not overhanging. In other portions, the engagement surface of the locking hook 9 has an overhang shape as described above due to the inclination of the curved portion 20, and the overhang shape approaches the other end 1 of the curved portion 20 as described above. The hang amount is large, that is, the overhang is strong.

When the hooks 9 having such a shape are engaged with each other, the one end edge 22 comes into contact with the leading edge 23 of the hook 9 of the mating projection 8. Since the one edge 22 and the front edge 23 are orthogonal to each other, the intersection of these edges is a point contact. Since the one end edge 22 extends along the circumferential direction, the locking hooks 9 engage while moving relatively along the circumferential direction. Therefore, unlike the case where the locking hook portion is formed in an overhanging shape as described above, the fitting member 2 does not need to be excessively close to each other, thereby facilitating the connection operation.

When the load by the urging mechanism 10 or the load in the axial direction due to the internal pressure of the pipes 1a and 1b acts while the locking hooks 9 are engaged with each other, one end edge as described above is applied. The point contact portion between the tip edge 22 and the leading edge 23 is easily elastically or plastically deformed.
The other part of the engagement surface is engaged.

As described above, since the portion other than the one end edge 22 is overhanging due to the inclination of the curved portion 20, the portions are engaged with each other to be engaged with each other. Thus, loosening of the engagement of the locking hooks 9 can be more reliably prevented.

In FIG. 3, the angle of inclination of the curved portion 20 is shown large for easy understanding, but in an actual product, the angle of inclination may be small. The engagement surface of the locking hook 9 is deformed sequentially from the end edge 22 by the load due to the elastic force of the urging member 10 or the axial load due to the internal pressure of the pipes 1a and 1b. Are preferably designed so as to entirely contact and engage. Further, it is preferable that the locking hook 9 is designed so that the plastic deformation does not occur in the portion of the one edge 22, that is, the portion where the stress is the largest, even when the entire surface of the hook 9 contacts. Such a design is based on the fitting member 2.
Based on the physical properties of the material, analysis of deformation under load, and other conditions, the above-described preferable design can be performed.

The shape and configuration of the locking hook 9 are not limited to those of the above embodiment. For example, FIG.
FIG. 4 shows the shape of the locking hook 9 in the second embodiment of the present invention. FIG. 4 is a view corresponding to FIG. Figure 4 shows a side view from inside.

In this embodiment, a cutout groove 25 composed of a cylindrical surface or a tapered cylindrical surface is formed diagonally on the side surface of the fitting projection 8. In order to prevent stress concentration, the cut groove 25 gradually becomes shallow toward one end thereof and disappears, and the other end reaches the engaging surface of the locking hook 9.

Therefore, at the portion 27 where the cut groove 25 reaches, the engaging surface of the locking hook 9 is formed in an overhang shape. In the portion 26 where the cut groove 25 does not reach, the engaging surface is formed in a plane along the circumferential direction. The width of the portion 26 is set to be at least half the width of the locking hook 9.

When the locking hooks 9 are engaged with each other, the engaging surfaces of the portions 26 where the cut grooves 25 do not reach, that is, the flat engaging surfaces, are aligned with each other at the central portion. 9 overlaps the unreached portion 26. Therefore,
At the overlapping portion of the central portion, the locking hooks 9 are guided along the circumferential direction and easily engage.

When the above-mentioned load is applied to the engaging hook 9 in the engaged state, the overlapped portion at the central portion is deformed, and the portions 27 to which the cut grooves 25 on both sides reach, namely The overhang-shaped parts gradually come into contact with each other, and these overhang-shaped parts mesh with each other,
This prevents the hook 9 from loosening.

The structure of the locking hook 9 of this embodiment is the same as that of the first embodiment except for the above-mentioned points, and the deformation and contact of each part are also the same as those of the first embodiment. Is designed in the same manner as in the embodiment.

FIG. 5 shows the structure of the hook 9 in the third embodiment. This is suitable when the fitting member 2 is formed of a material having a relatively small elastic coefficient, such as an aluminum alloy, that is, a material that is relatively easily deformed.

In this embodiment, the engaging surface 9a of the hook 9 has a flat shape along the circumferential direction. Therefore, the locking hook 9 relatively moves along the circumferential direction and engages.

The front end face of the fitting projection 8 is hardened only at the surface by induction hardening or other surface treatment, so that a hardened layer 30 is formed. Therefore, when the load described above is applied in a state where these hooks 9 are engaged, the engaging surface 9a of the hook 9 is deformed, but the hardened layer 30 is deformed. As a result, the engagement surfaces 9a mesh with each other in a state of being overhanged. Therefore, the locking hook 9 can be more effectively prevented from loosening.

In this embodiment, the shape of the locking hook 9 is simple, processing is easy, and cost can be reduced. Except for the points described above, the third embodiment is the same as the first embodiment.

FIG. 6 is a front view and a sectional view of the fitting projection 8 showing the structure of the locking hook 9 according to the fourth embodiment of the present invention. This is suitable when the fitting member 2 is formed of a soft and easily deformable material such as a synthetic resin material.

In this embodiment, the engaging surface 9a of the engaging hook 9 is formed by a plane extending in the circumferential direction. An insert member 40 is integrally embedded inside the front surface of the fitting projection 8. The insert member 40 is a plate-shaped member made of a hard material, for example, a steel material. The distal end portion 41 is exposed in a blade-like manner at the distal end edge of the engaging surface of the locking hook 9. A plurality of mounting holes 42 are formed in the insert member 40, and these mounting holes 42 are filled with a resin material to increase the strength of embedding in the fitting projections 8. .

In this embodiment, similarly to the above-described third embodiment, when a load is applied in a state in which the hook 9 is engaged, the portion of the engaging surface 9a is deformed. Since the surface 40 is not deformed, as a result, the engagement surface 9a meshes in a state of being overhanged. Therefore, the locking hook 9 can be more effectively prevented from loosening.

In this embodiment, when the fitting member is injection-molded, it can be manufactured only by embedding the insert member 40 in the vicinity of the locking hook 9, thereby reducing the cost. Except for the above points, the fourth embodiment is the same as the first embodiment.

The present invention can be applied not only to the above-described connecting device for the piping elements of the hydraulic system but also to other connecting devices. For example, FIGS. 9 to 11 show a fifth embodiment of the present invention. In this embodiment, the present invention is applied to a connecting device for a fire hose, that is, a fitting.

In the drawing, reference numerals 1a and 1b denote fire hoses to be connected, and connection metal fittings 2a and 2b are attached to their ends. These coupling metal bodies 2a, 2b
As shown in FIG. 10, a serrated hose mounting portion 4 is provided on the inner peripheral surface of the fitting member 3, and the fire hoses 1a and 1b are inserted therein. Then, it is crimped and attached by a mounting ring (not shown) press-fitted into the housing.

A fitting projection 8 having the same structure as that of the above-described embodiment is protruded from the distal end portion of the fitting member 3, and a side surface of the fitting projection 8 is locked. A hook 9 is formed. Then, the engaging surfaces of the locking hooks 9 are circumferentially engaged with each other in the same manner as described above, thereby restricting the movement in the axial direction, and connecting these fitting members 3.

In this embodiment, the sealing member 6 formed of an elastic material such as synthetic rubber is provided at the tip of the fitting member 3.
Are provided, and the sealability is maintained by contacting these. In this embodiment, an urging means, that is, an urging mechanism 60 is provided on the back side of each fitting projection 8.

As shown in FIG. 11, the biasing mechanism 60 has a ball plunger structure in which a steel ball 65 and a spring 66 for biasing the steel ball 65 are accommodated in a case member 64. Then, as shown in FIG. 11, when the fitting protrusions 8 are fitted and the locking hooks 9 are engaged with each other, the steel balls 65 of these biasing mechanisms 60 come into contact with each other. Push together and urge these fitting members 3 in the axial direction to each other, and also urge them to rotate in the circumferential direction.
The urging force is used to maintain the engagement of the locking hook 9.

In this embodiment, as shown in FIG. 11, the engaging surface of the locking hook 9 is formed in a predetermined amount of overhang even in a no-load state.
The engaging surfaces of the locking hooks 9 correspond to the first
As shown in the fourth to fourth embodiments, the structure is such that when an axial load is applied, it is deformed to mesh with an overhang.

In this embodiment, the locking hooks 9 have a certain degree of overhang even in the no-load initial state, so that these locking hooks 9 are only urged by the urging mechanism 60. The meshing state is maintained, and the loosening of these engagements is prevented. When a pressure acts on the inside of the hose, a large load acts on these fitting members 3 so as to separate them in the axial direction. Therefore,
This load deforms the engaging surface of the locking hook 9 as described above and engages in an overhang shape, so that loosening of the engagement can be prevented more reliably.

The present invention is not limited to the above embodiment. For example, the configuration and shape of the locking hook are not limited to the above embodiment, and various types can be adopted.
In applications other than applications requiring particularly high reliability, such as for aerospace, the engagement surface of the locking hook may be a simple shape that engages in a direction along the circumferential direction.

The urging member is not limited to the one described in the above embodiment, but may have any other shape and configuration. The urging member is not necessarily integral with a piping element such as piping. Or separate ones. Further, the urging member is not necessarily limited to a member that also serves as a sealing member, and the urging member and the sealing member may be separate members.

Further, the present invention can be applied not only to the connection of the piping elements of the hydraulic system but also to the connection of any other piping elements or other members. The material and the like of the parts can be arbitrarily selected.

[0076]

As described above, according to the present invention, when an axial load is applied by the biasing means or the internal pressure in the piping element or other excessive load, the engaging surface of the locking hook is deformed. As a result, they can be engaged in an overhang shape, preventing loosening of these engagements, and obtaining high reliability.

Further, since this is meshed in an overhang shape due to the axial load as described above, the overhang amount of the engaging surface of these locking hooks is reduced by that much or the overhang amount is reduced. Is zero, that is, there is no overhang, and the effect is large such that the workability at the time of connection is not impaired.

[Brief description of the drawings]

FIG. 1 is a vertical cross-sectional view of the connection device of the first embodiment in a disconnected state.

FIG. 2 is a longitudinal sectional view of a connection state of the connection device according to the first embodiment.

FIG. 3 is a front view and a side view of a locking hook according to the first embodiment.

FIG. 4 is a front view and a side view of a locking hook according to a second embodiment.

FIG. 5 is a sectional view of a locking hook according to a third embodiment.

FIG. 6 is a front view and a cross-sectional view of a locking hook according to a fourth embodiment.

FIG. 7 is a side view of a connection tool used for connection work of the connection device of the present invention.

FIG. 8 is a view taken in the direction of arrow 8-8 in FIG. 7;

FIG. 9 is a perspective view of a connection device according to a fifth embodiment.

FIG. 10 is a longitudinal sectional view of a connection device according to a fifth embodiment.

FIG. 11 is a plan view of a fitting projection and a locking hook of a connection device according to a fifth embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1a, 1b Piping 2 Fitting member 8 Fitting protrusion 9 Locking hook 10 Urging member 12 Lip part 60 Urging mechanism

Claims (6)

[Claims] 1. A connection device for connecting a first and a second member to be connected to each other in a state where the first and second members are opposed to each other, wherein the first and the second members are provided at respective ends of the first and the second members. A first and a second fitting member, a plurality of fitting protrusions protruding in the axial direction from the distal ends of these fitting members, and a plurality of fitting protrusions formed between the fitting protrusions. A fitting recess fitted in the axial direction; and the first and second fittings formed on side surfaces of the fitting projection.
A locking hook that engages by the relative rotation of the fitting members in the circumferential direction to restrict the movement in the axial direction; and the above-described fitting in a state where the locking hooks are engaged with each other. An urging means for urging the members in a direction to separate the members from each other to maintain the engagement state of the locking hooks, and an engaging surface of the locking hooks engaging with each other, wherein the fitting members are A connection device characterized by being deformed into an overhanging shape that meshes with each other when a load acting in the direction of separation is applied. 2. The engaging surface of the locking hook portion is formed such that at least a portion thereof has an overhang amount larger than that of another portion, and when the other portion is deformed by a load. 2. The connection device according to claim 1, wherein the portions having a large overhang amount are engaged with each other. 3. The other portion of the engaging surface of the locking hook portion,
3. The connection device according to claim 2, wherein the overhang amount is zero when no load is applied. When the load is applied, the engaging surface of the locking hook has a large deformation at a root portion, a small deformation at a leading edge portion, and is deformed into an overhang shape to form an overhang. 2. The connection device according to claim 1, wherein the connection device engages. 5. The connecting device according to claim 4, wherein the engaging hook portion is formed such that a front edge portion of the engaging surface has higher hardness than other portions. 6. The connection device according to claim 4, wherein the engagement surface of the locking hook has an overhang amount of zero when no load is applied.