JP5416505B2 - Fitting device - Google Patents

Description

  More particularly, the present invention relates to a joint device that is a joint for different connection objects, and more specifically, a first joint member to which a connection object to which a load such as a torsional force is applied is welded. The present invention relates to an integrally molded joint device.

Patent document 1 is known as a joint member in which a joint portion made of a material having good weldability is formed by cast iron made of cast iron. In Patent Document 1, a flange is formed on one of the joint members, and the flanges are butted against each other by bolts and nuts to connect the pipes.
However, in the joint member described in Patent Document 1, when a load such as a twisting force is applied to the member welded to the joint, the joint may be disconnected from the connection body or the joint may be deformed. there were.

JP 2001-99367 A

  The present invention takes the above-described conventional art into consideration, and even if a load such as a twisting force is applied to a connection object connected by welding, the welded first joint member and the first joint Provided is a joint device capable of strengthening the integrity with a second joint member in which the member is cast and preventing the first joint member from being deformed or coming out of the second joint member. For the purpose.

In order to achieve the above object, according to the first aspect of the present invention, there is provided a joint device connected to a connection object, wherein the joint device is a first weldable member connected to the connection object by welding. A joint member, and a cast iron second joint member formed integrally with the first joint member by casting in a state in which a part of the first joint member is exposed, the first joint member, said second coupling member embedded in the end face, are arranged at intervals in a circumferential direction of the end face, extending toward the center from the outer edge of the end face, and wherein A plurality of notches having an inner wall surface formed perpendicular to the end surface and spaced in the circumferential direction of the end surface, and the interval between the inner wall surfaces is expanded as the outer edge of the end surface is approached. A coupling device is provided.

  According to a second aspect of the present invention, in the first aspect of the present invention, the peripheral surface of the first joint member is provided with one or a plurality of peripheral grooves continuous in the circumferential direction, and the peripheral grooves together with the notches It is characterized by being embedded in the second joint member.

  According to the first aspect of the present invention, the end surface of the first joint member cast into the second joint member has an inner wall surface extending from the outer edge of the end surface toward the center and spaced in the circumferential direction. A notch is provided, and the interval between the inner wall surfaces widens toward the outer edge of the end surface. For this reason, the molten metal of the second joint member made of cast iron enters the notch, enters the notch, firmly meshes, and is firmly fixed in the circumferential direction. As a result, even if a twisting force is applied to the connection object, the torque can be distributed and received by the plurality of notches, so that high strength (resistance) can be exhibited against such a twisting force. it can. Further, since the inner wall surface of the notch is formed so as to expand toward the outer edge of the end surface, the torque does not concentrate on the outer peripheral side of the first joint member when a twisting force is applied, and the torque Can also be received on the inner wall surface of the notch. Therefore, it can prevent that the meshing part of either the 1st joint member and the 2nd joint member will change or destroy, and can aim at improvement in durability. Further, by using a first joint member having better weldability than the second joint member and casting it in the second joint member, a connection object connected to the first joint member by welding and Connectivity can be strengthened.

  According to the invention of claim 2, the circumferential surface of the first joint member is provided with one or a plurality of circumferential grooves continuous in the circumferential direction, and this is cast into (embedded in) the second joint member together with the notch. Therefore, when the molten metal enters and solidifies in the circumferential groove, the first joint member and the second joint member engage with each other, and are firmly fixed in the axial direction. For this reason, the tensile and compressive loads applied in the axial direction are received by the circumferential groove, and in addition to the high strength against the twisting force applied in the circumferential direction, which is the effect of claim 1, high strength is also provided against the tensile and compressive loads. It can be demonstrated. In addition, when a bending load is applied to the connection object to be welded to the first joint member and the first joint member is warped, the circumferential groove is caught, and the first joint member comes off the second joint member. Can be prevented.

It is a front view of the joint apparatus concerning the present invention. It is a front view of the 1st joint member used for the joint apparatus concerning the present invention. It is AA sectional drawing of FIG. It is a front view of the other coupling apparatus which concerns on this invention. It is a front view of another 1st coupling member. It is BB sectional drawing of FIG. It is sectional drawing when a connection target object is connected using the coupling apparatus which concerns on this invention. It is sectional drawing when a connection target object is connected using the other coupling apparatus which concerns on this invention.

FIG. 1 is a front view of a joint device according to the present invention. FIG. 2 is a front view of a first joint member used in the joint device according to the present invention, and FIG. 3 is a cross-sectional view taken along the line AA in FIG.
As shown in FIG. 1, the joint device 1 according to the present invention includes a first joint member 2 and a second joint member 3. The first joint member 2 has a shape in which only the upper end portion protrudes and is exposed, and the other portion is cast into the second joint member 3. Since it is cast, the first joint member 2 and the second joint member 3 are in close contact with each other without a gap, but are not welded.

  The first joint member 2 is made of steel having good weldability, such as low carbon steel, and the second joint member 3 is cast iron (spheroidal graphite cast iron). As the second joint member 3, it is preferable to determine a reference value for elongation in order to prevent brittle fracture. Moreover, it is preferable to determine the carbon equivalent in order to improve the fluidity of the molten metal, realize production of a complicated shape, perform casting at a relatively low temperature, and obtain advantages such as low manufacturing costs.

  Since the second joint member 3 has a low carbon content and is poor in weldability, the first joint member 2 made of steel with good weldability is exposed from the second joint member 3, It can be easily joined (connected) to the connection object 11 (see FIG. 7) to be connected by welding. That is, by using the first joint member having better weldability than the second joint member and casting it with the second joint member, the connection object connected to the first joint member by welding and Connectivity can be strengthened.

When the second joint member 3 is a joint of a universal joint as shown in FIG. 1, the side opposite to the side where the first joint member is cast is an arcuate yoke 4, which is provided at a predetermined position. The through hole 5 is used to connect to a yoke in another joint device via a cross spider or a sphere.
2 and 3 show a case where the first joint member 2 is solid. A plurality of notches 6 are provided on the end face of the first joint member 2. The notches 6 are notched from the outer edge of the embedded end face of the first joint member 2 toward the center, and are formed at equal intervals in the circumferential direction of the end face. Since the end surface on the side where the notch 6 is formed is cast with the second joint member 3, the molten metal of the second joint member 3 made of cast iron enters the notch and firmly meshes with the circumferential direction. It is firmly fixed against. As a result, even if a twisting force is applied to the connection object, the torque can be distributed and received by the plurality of notches 6, so that a high strength (resistance) is exhibited against such a twisting force. Can do. If the number of notches (the number of notch portions 6) is small, the stress acting on the inner wall surface of each notch portion 6 increases, and the meshing of either the first joint member 2 or the second joint member 3 occurs. Since the portion is deformed or broken, it is preferable to determine the number of notches in consideration of this.

The number of notches 6, the notch height, and the notch width are determined by the bearing pressure applied to the inner wall surface of the notch 6, the shearing force applied to the root surface of the protrusion 8 sandwiched between the notches 6, and the notch It is preferable that the allowable stress for each of the shearing forces applied to the second joint member 3 side meshing with the notch portion 6 is set to be larger than the stress generated at the yield torsional moment of the joint device 1.
When the above conditions are satisfied, the number of cutouts is as small as possible and the cutout height is set low, so that the cast-in depth can be reduced and the product weight can be reduced.

  The interval between the inner wall surfaces 7, 7 existing in the circumferential direction of the notch 6 is expanded from the center of the first joint member 2 toward the outer edge. That is, the inner wall surface 7 is formed to be radial from the center of the end surface of the first joint member 2. For this reason, when a twisting force is applied, the torque is not concentrated on the outer peripheral side of the first joint member 2, and the torque can also be received by the inner wall surface 7 of the notch portion 6. Therefore, deformation of the first joint member 2 can be prevented, and durability can be improved.

  A plurality of circumferential grooves 9 are provided in the circumferential direction over the entire circumference on the outer circumferential surface, which is the side surface of the first joint member 2 (three circumferential grooves 9 in FIG. 2). The circumferential groove 9 is cast into the second joint member 3 together with the notch 6 described above. Thereby, the molten metal enters the circumferential groove 9 and solidifies, whereby the first joint member 2 and the second joint member 3 are engaged and firmly fixed in the axial direction. For this reason, the circumferential groove 9 can receive tensile and compressive loads applied in the axial direction. In addition, when a bending load is applied to the connection object to be welded to the first joint member 2 and the first joint member 2 is warped, the circumferential groove 9 is caught, and the first joint member 2 becomes the second joint. It is possible to prevent the member 3 from coming off. The circumferential groove 9 may be one.

  The depth of this circumferential groove 9 is the allowable tensile force of the remaining thick portion of the circumferential groove 9 (the thick portion of the portion where the circumferential groove 9 is formed in the first joint member 2), and the allowable bearing pressure in the circumferential groove portion. (Allowable amount with respect to the supporting pressure acting on the upper surface and lower surface of the circumferential groove 9) is larger than the allowable tensile force of the joint member 1, and the total plastic moment of the remaining thick portion of the circumferential groove 9 is The yield torsion moment in the remaining thick portion of the circumferential groove 9 is set to be greater than the plastic moment and greater than the yield torsion moment of the joint member 1.

Since the depth of the circumferential groove 9 and the distance between the circumferential grooves 9 influence each other, they are set to be appropriately balanced.
FIG. 4 is a front view of another joint device according to the present invention.
As illustrated, the second joint member 3 is formed in a shape having a flange 10. Using this flange 10, the second joint member 3 is connected to various members as other connection objects. A connection example using a flange will be described later (see FIG. 7). Other configurations, operations, and effects are the same as in the example of FIG.

FIG. 5 is a front view of another first joint member, and FIG. 6 is a cross-sectional view taken along the line BB of FIG.
As illustrated, the first joint member 2 is formed in a tubular shape. Therefore, the concave and convex shape is continuously formed on the end face by the notch portion 6 and the protruding portion 8. Also in this notch part 6, the space | interval of the inner wall surfaces 7 and 7 is formed so that it may spread toward the outer edge from the center (axial center) of an end surface. That is, the inner wall surface 7 is formed so as to have a C shape in plan view when viewed from the end face side of the first joint member 2. Together with the first joint member 2, the second joint member 3 (see FIG. 7) is also tubular, so that the joint device 1 is directed from the tubular connection object 11 to another tubular connection object 16. The fluid and the powder can be circulated through (see FIG. 7). Other configurations, operations, and effects are the same as in the example of FIG.

FIG. 7 is a cross-sectional view when a connection object is connected using the joint device according to the present invention.
As illustrated, the connection object 11 is connected to the first joint member 2 constituting the joint device 1 according to the present invention, and the other joint device 1 ′ is connected to the second joint member 3. The connection object 11 is a pipe pipe, which is connected to the tubular first joint member 2 by welding. The second joint member 3 and the other joint device 1 ′ are in contact with each other by the flanges 10 and 10 ′ and connected by bolts 14 and nuts 15 using bolt holes 13. With such a configuration, another connection object (pipe pipe 16) is connected to the first joint member 2 'of the other joint apparatus 1' by welding, and the pipe pipe 11 and the pipe pipe 16 are connected to the joint apparatuses 1, 1 Can be connected through. Thus, by using a plurality of joint devices 1, 1 ′, the material (for example, aluminum, copper, etc.) of each first joint member 2, 2 ′ is selected and used in accordance with the material of the pipe pipe. Can do. Thereby, the difficulty of welding due to the formation of an intermetallic compound, thermal stress cracking, or the like can be avoided, and even if the materials of the objects to be connected are different, a strong connection can be achieved by welding.

FIG. 8 is a cross-sectional view when a connection object is connected using another joint device according to the present invention.
As shown in the figure, first joint members 2, 2 ′ having good weldability are encapsulated at both ends of the second joint member 3. Therefore, in this example, the joint device 1 is constituted by the first joint members 2, 2 ′ and the second joint member 3. In this case, the pipe pipe 17 and the pipe pipe 11 are connected by welding at both ends of the joint device 1, and the pipe pipe 11 as the connection object is the first joint member 2 and the pipe pipe as the other connection object. 17 is connected to the first joint member 2 '. In order to realize this, both connection objects 11 and 17 are connected by the joint device 1 by casting the first joint members 2 and 2 ′ at both ends of the second joint member 3. Also in this case, the material of each of the first joint members 2, 2 ′ can be selected and used in accordance with the material of the pipe pipe. Accordingly, the number of parts is reduced as compared with the case where two joint devices 1 are connected as shown in FIG. 7, and the structure is simple and can be easily connected. Other configurations, operations, and effects are the same as in the example of FIG.

DESCRIPTION OF SYMBOLS 1 Joint apparatus 2 1st joint member 3 2nd joint member 4 Yoke 5 Through-hole 6 Notch part 7 Inner wall surface 8 Protrusion part 9 Groove 10 Flange 11 Connection object (pipe pipe)
13 Bolt hole 14 Bolt 15 Nut 16 Pipe tube 17 Pipe tube

Claims (2)

A joint device connected to a connection object,
The joint device includes a first joint member having good weldability connected to the connection object by welding,
A cast iron second joint member formed integrally with the first joint member by casting in a state where a part of the first joint member is exposed;
The first joint member is arranged with an end surface embedded in the second joint member, spaced in the circumferential direction of the end surface, extends from the outer edge of the end surface toward the center, and A plurality of notches having an inner wall surface formed perpendicular to the end surface and spaced in the circumferential direction of the end surface;
The joint device, wherein the interval between the inner wall surfaces is expanded as the outer edge of the end surface is approached. The peripheral surface of the first joint member includes a single or a plurality of peripheral grooves continuous in the circumferential direction,
The joint device according to claim 1, wherein the circumferential groove is embedded in the second joint member together with the notch.

Images