CN218598550U

CN218598550U - Connecting joint and vehicle frame

Info

Publication number: CN218598550U
Application number: CN202222403995.9U
Authority: CN
Inventors: 杨伟国; 迟达; 余丽娟; 丁振龙
Original assignee: Tsinghua University; Suzhou Automotive Research Institute of Tsinghua University
Current assignee: Tsinghua University; Suzhou Automotive Research Institute of Tsinghua University
Priority date: 2022-09-09
Filing date: 2022-09-09
Publication date: 2023-03-10
Anticipated expiration: 2032-09-09

Abstract

The utility model relates to a vehicle assembly technical field specifically discloses attach fitting and frame, attach fitting is including connecting main part and first connecting piece, it has the through-hole that link up the joint main part to connect the main part, circular pipe fitting one end is passed the through-hole, square pipe fitting and joint main part fixed connection, first connecting piece is fixed to be set up on circular pipe fitting, first connecting piece sets up the one side at the joint main part, first connecting piece and joint main part fixed connection, connect main part and square pipe fitting fixed connection, circular pipe fitting passes joint main part and first connecting piece respectively with circular pipe fitting and joint main part fixed connection, replace welded joint, avoid welding process's pollution, attach fitting's tie point is dispersed into a plurality ofly, guarantee that attach fitting's position can the even load in many places simultaneously, reduce the too big and concentrated risk of the stress of attach fitting position, the thermal influence district can not appear in attach fitting's position, further reduce near the risk of fracture or damage that the stress concentration leads to in reason.

Description

Connecting joint and vehicle frame

Technical Field

The utility model relates to a vehicle assembly technical field especially relates to attach fitting and frame.

Background

In the vehicle assembling process, the pipe fitting structural strength is higher, the wide application is in the frame structure, the connection of circular pipe fitting and square pipe fitting adopts carbon dioxide arc welding most at present, but the production efficiency who adopts carbon dioxide arc welding is low and pollute greatly, in addition because the pipe fitting structure is being connected of circular pipe fitting and square pipe fitting, the condition that stress distribution is uneven and stress concentration can appear in the welded joint position, at the position that stress concentration, the condition that the heat affected zone near welded joint position received stress concentration effect and ftractures or damages appears easily.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a attach fitting to solve current welded joint and pollute big and stress concentration and lead to the problem of fracture or damage.

The utility model provides a connector for connect circular pipe fitting and square pipe fitting, this connector is including connecting main part and first connecting piece, connects the main part and has the through-hole that link up the joint main part, and circular pipe fitting one end is passed the through-hole, square pipe fitting and joint main part fixed connection, and first connecting piece is fixed to be set up on circular pipe fitting, and first connecting piece sets up in one side of connecting the main part, first connecting piece and joint main part fixed connection.

As the preferred technical scheme of the connecting joint, the connecting joint further comprises a second connecting piece, wherein the second connecting piece is fixedly arranged on the round pipe fitting, the second connecting piece is arranged on the other side of the joint main body, and the second connecting piece is fixedly connected with the joint main body.

As the preferred technical scheme of attach fitting, first connecting piece has first connecting hole, and first connecting hole is worn to establish by circular pipe fitting, and the pore wall of first connecting hole sets up first internal thread, first connecting piece and circular pipe fitting spiro union.

As attach fitting's preferred technical scheme, the second connecting piece has the second connecting hole, and the second connecting hole is worn to establish by circular pipe fitting, and the pore wall of second connecting hole sets up the second internal thread, second connecting piece and circular pipe fitting spiro union.

As a preferable technical scheme of the connecting joint, the first internal thread and the second internal thread are opposite in rotation direction.

As the preferred technical scheme of attach fitting, still include the protruding portion, the fixed setting of one end of protruding portion is on the joint main part, and the other end detachably of protruding portion is fixed the setting on square pipe fitting.

As the preferred technical scheme of attach fitting, the quantity of protruding portion is two, and the one end of two protruding portions is all fixed to be set up on connecting the main part, and the other end of two protruding portions detachably respectively is fixed to be set up on two square pipe fittings.

The utility model provides a frame, including circular pipe fitting and square pipe fitting, this frame still includes the attach fitting in the above-mentioned scheme.

As the preferred technical scheme of frame, first connecting piece and circular pipe fitting welding, the second connecting piece and circular pipe fitting welding.

As the optimal technical scheme of the frame, the first connecting piece is in interference connection with the round pipe fitting, and the second connecting piece is in interference connection with the round pipe fitting.

The utility model has the advantages that:

the utility model provides a connector for connect circular pipe fitting and square pipe fitting, this connector is including connecting main part and first connecting piece, connects the main part and has the through-hole that link up the joint main part, and circular pipe fitting one end is passed the through-hole, and square pipe fitting and joint main part fixed connection, first connecting piece are fixed to be set up on circular pipe fitting, and first connecting piece sets up in one side of connecting the main part, first connecting piece and joint main part fixed connection. Pass the joint main part through joint main part and square pipe fitting fixed connection and circular pipe fitting, the welded joint has been replaced, avoid the smoke and dust that produces among the welding process, gas and light pollution, circular pipe fitting passes the joint main part simultaneously, first connecting piece respectively with circular pipe fitting and joint main part fixed connection, the tie point of attach fitting is dispersed into a plurality ofly, guarantee that the position of attach fitting can many places bear the weight of simultaneously and bear the weight of evenly, compare the welded joint of the single tie point of circular pipe fitting and square pipe fitting direct welding, reduce the too big and concentrated risk of stress of attach fitting position to a certain extent, simultaneously because the position of attach fitting does not adopt welding process, the equal relatively poor heat affected zone of each item mechanical properties can not appear in attach fitting's position, the risk of fracture or damage that leads to near the attach fitting because of stress concentration has further been reduced.

Drawings

Fig. 1 is a schematic structural view of a connection joint in an embodiment of the present invention;

fig. 2 is an exploded view of a connection joint according to an embodiment of the present invention.

In the figure:

1. a connector body; 11. a first connecting member; 111. a first connecting bolt; 112. a first coupling nut; 113. a first mounting hole; 12. a second connecting member; 121. a second connecting bolt; 122. a second coupling nut; 123. a second connection hole; 13. a protrusion; 131. connecting a threaded hole;

2. a circular tube.

Detailed Description

The technical solution of the present invention will be described in detail and fully with reference to the accompanying drawings, and obviously, the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by a person skilled in the art without making creative efforts belong to the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Where the terms "first position" and "second position" are two different positions, and where a first feature is "over", "above" and "on" a second feature, the first feature is directly over and obliquely above the second feature, or simply means that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood as appropriate by those of ordinary skill in the art.

Reference will now be made in detail to the embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present invention, and should not be construed as limiting the present invention.

In the vehicle assembling process, pipe structural strength is higher, and the wide application is in the frame structure, and the welding is welded with the connection of square pipe fitting to circular pipe fitting and the most adoption carbon dioxide arc welding at present, but the production efficiency who adopts carbon dioxide arc welding is low and pollute big, in addition because the pipe structure is the connection of circular pipe fitting and square pipe fitting, the condition that stress distribution is uneven and stress concentration can appear in the welded joint position, at the position that stress concentration, the condition that the heat affected zone near the welded joint position received stress concentration effect and ftractures or damages appears easily. In this regard, the present embodiment provides a connection joint that is capable of connecting a round pipe and a square pipe as well, while solving the above-mentioned problems.

Example one

As shown in fig. 1-2, the coupling joint is used to connect a round pipe 2 and a square pipe. This attach fitting is including connecting main part 1 and first connecting piece 11, connects main part 1 to have the through-hole that link up and connect main part 1, and the through-hole is passed to 2 one ends of circular pipe fitting, square pipe fitting and the fixed connection that connects main part 1, and first connecting piece 11 is fixed to be set up on circular pipe fitting 2, and first connecting piece 11 sets up in the one side that connects main part 1, first connecting piece 11 and the fixed connection that connects main part 1.

Specifically, joint main part 1 and square pipe fitting fixed connection and circular pipe fitting 2 wear to establish joint main part 1, welding joint has been replaced, avoid the smoke and dust that produces among the welding process, gas and light pollution, circular pipe fitting 2 passes joint main part 1 simultaneously, first connecting piece 11 respectively with circular pipe fitting 2 and joint main part 1 fixed connection, connecting joint's tie point is dispersed into a plurality ofly, guarantee that connecting joint's position can many places bear the weight of simultaneously and bear the weight of evenly, compare the welding joint of circular pipe fitting 2 and square pipe fitting direct welding's single tie point, reduce the too big and concentrated risk of stress of connecting joint position to a certain extent, simultaneously because connecting joint's position does not adopt welding process, the equal relatively poor heat affected zone of each item mechanical properties can not appear in connecting joint's position, further reduced near the cracking or the risk of damaging that leads to because of stress concentration.

Further, the connecting joint further comprises a second connecting piece 12, the second connecting piece 12 is fixedly arranged on the circular pipe fitting 2, the second connecting piece 12 is arranged on the other side of the joint main body 1, and the second connecting piece 12 is fixedly connected with the joint main body 1. The first connecting piece 11 is preferably screwed to the joint body 1, and the second connecting piece 12 is preferably screwed to the joint body 1.

Further, the joint body 1 is a tubular member. In this embodiment, the joint body 1 has a first mounting hole 113, and the first coupling nut 112 is fixedly disposed on the inner wall of the joint body 1. The first coupling nut 112 is preferably welded to the joint body 1. The first coupling nut 112 is disposed coaxially with the first mounting hole 113, and the first coupling member 11 is threadedly coupled with the first coupling nut 112 through the first mounting hole 113 by the first coupling bolt 111. The number of the first coupling bolts 111 may be 2, 3 or 4, and in the present embodiment, the number of the first coupling bolts 111 is preferably 2. The joint body 1 is provided with a second mounting hole, and a second connecting nut 122 is fixedly arranged on the inner wall of the joint body 1. The second coupling nut 122 is preferably connected to the joint body 1 by welding. The second coupling nut 122 is disposed coaxially with the second mounting hole, and the second connector 12 is threadedly coupled to the second coupling nut 122 through the second mounting hole by the second coupling bolt 121. The number of the second coupling bolts 121 may be 2, 3, or 4, and in the present embodiment, the number of the second coupling bolts 121 is preferably 2.

Optionally, in other embodiments of the present invention, the joint main body 1 has a first mounting hole 113, the first mounting hole 113 is a threaded hole, and the first connecting member 11 is screwed with the first mounting hole 113 of the joint main body 1 through the first connecting bolt 111. The joint main body 1 is provided with a second mounting hole which is a threaded hole, and the second connecting piece 12 is in threaded connection with the second mounting hole on the joint main body 1 through a second connecting bolt 121.

Further, a sealing element can be arranged between the first connecting piece 11 and the joint main body 1, so that water vapor is prevented from entering the inside of the joint main body 1 and being discharged in time to cause corrosion damage to the inside of the joint main body 1. Both ends of the seal member abut against the first connecting member 11 and the joint main body 1, respectively. In this embodiment, the seal is preferably a sealing rubber pad. After the first connecting member 11 is fixed to the joint main body 1 by the first connecting bolt 111, the sealing rubber pad is deformed by being pressed, thereby achieving a sealing effect.

Furthermore, a sealing element can be arranged between the second connecting piece 12 and the joint main body 1 to prevent water vapor from entering the inside of the joint main body 1 and being unable to be discharged in time to cause corrosion damage to the inside of the joint main body 1. Both ends of the seal member abut against the second connector 12 and the joint main body 1, respectively. In this embodiment, the sealing member is preferably a rubber gasket. After the second coupling member 12 is fixed to the joint body 1 by the second coupling bolt 121, the sealing rubber pad is deformed by being pressed, thereby achieving a sealing effect.

Alternatively, the first connector 11 has a first connection hole, and one end of the circular pipe member 2 passes through the first connection hole and the through hole in this order. The second connecting member 12 has a second connecting hole 123, and one end of the circular pipe member 2 passes through the second connecting hole 123.

Further, the pore wall of first connecting hole sets up first internal thread, and certain part position of 2 lateral walls of circular pipe fitting sets up first external screw thread, and circular pipe fitting 2 wears to establish first connecting hole and with the spiro union of first connecting piece 11. The pore wall of second connecting hole 123 sets up the second internal thread, and another local position of circular pipe fitting 2 lateral wall sets up the second external thread, and circular pipe fitting 2 wears to establish second connecting hole 123 and with second connecting piece 12 spiro union.

Further, in the present embodiment, the first internal threads are left-hand threads and the second internal threads are right-hand threads. In other embodiments of the present invention, the first internal thread may also be a right-handed thread, and the second internal thread may also be a left-handed thread.

Specifically, when the circular pipe 2 is connected to the joint body 1, the first connecting member 11 is sleeved on the outer wall of the circular pipe 2 from one end of the circular pipe 2 and screwed into the first external thread at a certain local position on the outer side wall of the circular pipe 2. The circular pipe member 2 is passed through the through hole of the joint main body 1 and then the first connecting member 11 is fixed to the joint main body 1 by 2 first connecting bolts 111. And sleeving the second connecting piece 12 on the outer wall of the circular pipe 2 from the other end of the circular pipe 2 and screwing the second connecting piece into a second external thread at the other local position of the outer side wall of the circular pipe 2. The circular pipe member 2 is rotated to adjust the relative position of the circular pipe member 2 with respect to the joint body 1. It should be noted that after the first connecting member 11 is fixed to the joint body 1, the circular pipe member 2 is rotated to change the position of the circular pipe member 2 relative to the joint body 1. The position of the circular pipe member 2 with respect to the joint main body 1 is adjusted until the second connecting member 12 comes into contact with the joint main body 1, and the second connecting member 12 is fixed to the joint main body 1 by 2 second connecting bolts 121. At this time, the first connecting member 11 and the second connecting member 12 are fixed to the joint main body 1. Meanwhile, due to the fact that the thread turning directions of the first connecting piece 11 and the second connecting piece 12 are opposite, when the circular pipe fitting 2 has a tendency of rotating around the axis, the movement tendency of a certain local position of the circular pipe fitting 2 is opposite to that of the other local position of the circular pipe fitting 2, the first connecting piece 11 and the second connecting piece 12 achieve mutual limiting of the circular pipe fitting 2 in the axial direction, and meanwhile the circular pipe fitting 2 can be prevented from rotating around the axial direction.

Optionally, the connection joint further comprises a protrusion 13, one end of the protrusion 13 is fixedly arranged on the joint main body 1, and the other end of the protrusion 13 is detachably and fixedly arranged on the square pipe. In the present embodiment, the connection manner of one end of the protruding portion 13 and the joint main body 1 may be interference connection, riveting, or bolt connection, and is preferably interference connection. The other end of the protrusion 13 is preferably connected to the square tube by means of a bolt.

Specifically, the joint main body 1 and the protrusion 13 are both square in cross section, and the joint main body 1 and the protrusion 13 are both tubular structures. One end of the protruding part 13 is inserted into the joint main body 1 and one end of the protruding part 13 is connected with the joint main body 1 in an interference manner, so that the protruding part 13 is fixedly connected with the joint main body 1. The other end of the protruding part 13 is inserted into the square pipe and the other end of the protruding part 13 is connected with the square pipe in a sliding mode. The other end of the protruding part 13 is provided with a threaded connecting hole 131, and the corresponding position of the square pipe is provided with an oblong through hole. The square pipe is fixedly connected with the protruding part 13 through bolts. In this embodiment, the number of bolts may be 2, 4 or 6, preferably 4. The number of the screw coupling holes 131 may be 2, 4 or 6, preferably 4. The number of oblong through holes is preferably 2, 4 or 6, preferably 4. Due to the arrangement of the long circular through hole, the depth of the other end of the protruding portion 13 inserted into the square pipe fitting can be adjusted, and the requirements of various working conditions are met.

Further, in practical engineering applications, there are also cases where one end of the circular pipe 2 is connected to one end of two square pipes at the same time. Therefore, the number of the protruding portions 13 in this embodiment may also be two, one end of each of the two protruding portions 13 is fixedly disposed on the joint main body 1, and the positions where the two protruding portions 13 are disposed on the joint main body 1 are determined according to the positional relationship between the two square pipe members and the circular pipe member 2. In the present embodiment, the connection manner of one end of each of the two protruding portions 13 and the joint main body 1 is preferably interference connection. The other ends of the two protruding portions 13 are detachably fixed on the two square pipes respectively, and in this embodiment, the other ends of the two protruding portions 13 are connected with the two square pipes respectively through bolts.

It should be noted that the connection joint in this embodiment can satisfy not only the connection that the axis of the circular pipe 2 is perpendicular to the axis of the square pipe, but also the connection that the axis of the circular pipe 2 is not perpendicular to the axis of the square pipe. The person skilled in the art can, depending on the engineering practice, provide the joint body as a tubular part with a certain bending angle. For example, for convenience of explanation, if the included angle between the axis of the circular pipe 2 and the axis of the square pipe is an acute angle, and the acute angle is a, the bending angle of the joint body is a +90 °. When the axis of the round pipe fitting 2 is perpendicular to the axis of the square pipe fitting, the bending angle of the joint body is 180 degrees, namely the joint body is not bent. And if the included angle between the axis of the round pipe fitting 2 and the axis of the square pipe fitting is an obtuse angle and the included angle of the obtuse angle is b, the bending angle of the joint body is 270-b.

This embodiment also provides a vehicle frame including the connection joint of this embodiment. Through the arrangement of the connecting joints, the frame is less polluted in the manufacturing process, meanwhile, the stress distribution of the positions of the connecting joints of the frame is more uniform, and the risk of cracking or damage caused by stress concentration in the vicinity of the connecting joints is lower.

Example two

As shown in fig. 1-2, the coupling joint is used to connect a round pipe 2 and a square pipe. The connecting joint comprises a joint main body 1 and a first connecting piece 11, wherein the joint main body 1 is provided with a through hole penetrating the joint main body 1, one end of a circular pipe fitting 2 penetrates through the through hole, the square pipe fitting is fixedly connected with the joint main body 1, the first connecting piece 11 is fixedly arranged on the circular pipe fitting 2, the first connecting piece 11 is arranged on one side of the joint main body 1, and the first connecting piece 11 is fixedly connected with the joint main body 1.

Further, the joint body 1 is a tubular member. In this embodiment, the joint body 1 has a first mounting hole 113, and the first coupling nut 112 is fixedly disposed on the inner wall of the joint body 1. The first coupling nut 112 is preferably connected to the joint main body 1 by welding. The first coupling nut 112 is disposed coaxially with the first mounting hole 113, and the first coupling member 11 is threadedly coupled with the first coupling nut 112 through the first mounting hole 113 by the first coupling bolt 111. The number of the first coupling bolts 111 may be 2, 3 or 4, and in the present embodiment, the number of the first coupling bolts 111 is preferably 2. The joint body 1 is provided with a second mounting hole, and a second connecting nut 122 is fixedly arranged on the inner wall of the joint body 1. The second coupling nut 122 is preferably connected to the joint body 1 by welding. The second coupling nut 122 is disposed coaxially with the second mounting hole, and the second connector 12 is threadedly coupled to the second coupling nut 122 through the second mounting hole by the second coupling bolt 121. The number of the second coupling bolts 121 may be 2, 3, or 4, and in the present embodiment, the number of the second coupling bolts 121 is preferably 2.

Further, a sealing element can be arranged between the first connecting piece 11 and the joint main body 1, so that water vapor is prevented from entering the inside of the joint main body 1 and being discharged in time to cause corrosion damage to the inside of the joint main body 1. Both ends of the seal member abut against the first joint 11 and the joint main body 1, respectively. In this embodiment, the sealing member is preferably a sealing rubber pad. After the first connecting member 11 is fixed to the joint main body 1 by the first connecting bolt 111, the sealing rubber pad is deformed by being pressed, thereby achieving a sealing effect.

Furthermore, a sealing element can be arranged between the second connecting piece 12 and the joint main body 1 to prevent water vapor from entering the inside of the joint main body 1 and being unable to be discharged in time to cause corrosion damage to the inside of the joint main body 1. Both ends of the seal member abut against the second connector 12 and the joint main body 1, respectively. In this embodiment, the seal is preferably a rubber gasket. After the second coupling member 12 is fixed to the joint body 1 by the second coupling bolt 121, the sealing rubber pad is deformed by being pressed, thereby achieving a sealing effect.

Alternatively, the first connecting member 11 has a first connecting hole, and one end of the circular pipe member 2 passes through the first connecting hole and the through hole in this order. The second connecting member 12 has a second connecting hole 123, and one end of the circular pipe member 2 penetrates through the second connecting hole 123.

Specifically, the first connecting member 11 is welded to the circular pipe member 2, and the second connecting member 12 is welded to the circular pipe member 2. When being connected circular pipe fitting 2 and joint main part 1, establish the outside to circular pipe fitting 2 with first connecting piece 11 from the pot head of circular pipe fitting 2 to with circular pipe fitting 2 and the welding of first connecting piece 11 in order to realize first connecting piece 11 and circular pipe fitting 2 fixed connection. Then, the other end of the circular pipe member 2 is inserted through the joint main body 1, and the first connecting member 11 is fixed to the joint main body 1 by the first connecting bolt 111. The second connecting member 12 is fixed to the joint main body 1 by the second connecting bolt 121 while being sleeved to the outer side of the circular pipe member 2 from the other end of the circular pipe member 2. Finally, the second connecting piece 12 is welded with the circular pipe fitting 2 to realize the fixed connection of the second connecting piece 12 and the circular pipe fitting 2.

Specifically, the joint main body 1 and the protrusion 13 are both square in cross section, and the joint main body 1 and the protrusion 13 are both tubular structures. One end of the protruding part 13 is inserted into the joint main body 1 and one end of the protruding part 13 is connected with the joint main body 1 in an interference manner, so that the protruding part 13 is fixedly connected with the joint main body 1. The other end of the protruding portion 13 is inserted into the square pipe and the other end of the protruding portion 13 is slidably connected with the square pipe. The other end of the protruding part 13 is provided with a threaded connection hole 131, and the corresponding position of the square pipe fitting is provided with an oblong through hole. The square pipe is fixedly connected with the protruding part 13 through bolts. In this embodiment, the number of bolts may be 2, 4 or 6, preferably 4. The number of the screw coupling holes 131 may be 2, 4 or 6, preferably 4. The number of oblong through holes is preferably 2, 4 or 6, preferably 4. Due to the arrangement of the long circular through hole, the depth of the other end of the protruding portion 13 inserted into the square pipe fitting can be adjusted, and the requirements of various working conditions are met.

Further, in practical engineering applications, there are also cases where one end of the circular pipe 2 is connected to one end of two square pipes at the same time. Therefore, the number of the protruding portions 13 in this embodiment may also be two, one end of each of the two protruding portions 13 is fixedly disposed on the joint main body 1, and the positions where the two protruding portions 13 are disposed on the joint main body 1 are determined according to the positional relationship between the two square pipe members and the circular pipe member 2. In the present embodiment, the connection manner of one end of each of the two protruding portions 13 and the joint main body 1 is preferably interference connection. The other ends of the two protruding parts 13 are detachably and fixedly arranged on the two square pipe fittings respectively, and in the embodiment, the other ends of the two protruding parts 13 are connected with the two square pipe fittings respectively through bolts.

It should be noted that the connection joint in this embodiment can not only satisfy the connection that the axis of the circular pipe 2 is perpendicular to the axis of the square pipe, but also satisfy the connection that the axis of the circular pipe 2 is not perpendicular to the axis of the square pipe. The person skilled in the art can, depending on the engineering practice, provide the joint body as a tubular part with a certain bending angle. For example, for convenience of explanation, assuming that an angle included between the axis of the circular pipe 2 and the axis of the square pipe is an acute angle, and the acute angle is a, the bending angle of the joint body is a +90 °. When the axis of the round pipe 2 is perpendicular to the axis of the square pipe, the bending angle of the joint body is 180 degrees, namely the joint body is not bent. If the included angle between the axis of the circular pipe fitting 2 and the axis of the square pipe fitting is an obtuse angle, and the included angle of the obtuse angle is b, the bending angle of the joint body is 270-b.

This embodiment also provides a vehicle frame including the connection joint of this embodiment. Through the arrangement of the connecting joints, the stress distribution at the connecting joint positions of the frame is more uniform, and the risk of cracking or damage caused by stress concentration near the connecting joints is lower.

EXAMPLE III

Specifically, connect main part 1 and square pipe fitting fixed connection and circular pipe fitting 2 to wear to establish and connect main part 1, welding joint has been replaced, avoid the smoke and dust that produces in the welding process, gas and light pollution, circular pipe fitting 2 passes and connects main part 1 simultaneously, first connecting piece 11 respectively with circular pipe fitting 2 and joint main part 1 fixed connection, the tie point of connecting joint is dispersed into a plurality ofly, guarantee that the position of connecting joint can many places bear the weight of simultaneously and bear the weight of evenly, compare the welding joint of the single tie point of circular pipe fitting 2 and square pipe fitting direct weld, reduce the too big and concentrated risk of stress of connecting joint position to a certain extent, simultaneously because the welding process is not adopted in the position of connecting joint, the heat affected area that all kinds of mechanical properties are all relatively poor can not appear in the position of connecting joint, the risk of fracture or damage that near the connecting joint leads to because of stress concentration has further been reduced.

Further, the joint body 1 is a tubular member. In this embodiment, the joint body 1 has a first mounting hole 113, and a first coupling nut 112 is fixedly disposed on an inner wall of the joint body 1. The first coupling nut 112 is preferably connected to the joint main body 1 by welding. The first coupling nut 112 is disposed coaxially with the first mounting hole 113, and the first coupling member 11 is threadedly coupled with the first coupling nut 112 through the first mounting hole 113 by the first coupling bolt 111. The number of the first coupling bolts 111 may be 2, 3, or 4, and in the present embodiment, the number of the first coupling bolts 111 is preferably 2. The joint body 1 is provided with a second mounting hole, and a second connecting nut 122 is fixedly arranged on the inner wall of the joint body 1. The second coupling nut 122 is preferably connected to the joint body 1 by welding. The second coupling nut 122 is disposed coaxially with the second mounting hole, and the second connector 12 is threadedly coupled to the second coupling nut 122 through the second mounting hole by the second coupling bolt 121. The number of the second coupling bolts 121 may be 2, 3, or 4, and in the present embodiment, the number of the second coupling bolts 121 is preferably 2.

Furthermore, a sealing element can be arranged between the second connecting piece 12 and the joint main body 1 to prevent water vapor from entering the inside of the joint main body 1 and being discharged in time to cause corrosion damage to the inside of the joint main body 1. Both ends of the seal member abut against the second connector 12 and the joint main body 1, respectively. In this embodiment, the seal is preferably a rubber gasket. After the second coupling member 12 is fixed to the joint body 1 by the second coupling bolt 121, the sealing rubber pad is deformed by being pressed, thereby achieving a sealing effect.

Specifically, the first connecting member 11 is in interference fit with the circular pipe 2, and the second connecting member 12 is in interference fit with the circular pipe 2. When being connected circular pipe fitting 2 and joint main part 1, establish the outside to circular pipe fitting 2 with first connecting piece 11 from the pot head of circular pipe fitting 2 to be connected first connecting piece 11 and 2 interference of circular pipe fitting in order to realize first connecting piece 11 and 2 fixed connection of circular pipe fitting. The other end of the circular pipe member 2 is then inserted through the joint body 1, and the first connecting member 11 is fixed to the joint body 1 by the first connecting bolt 111. The second connecting member 12 is fixed to the joint main body 1 by the second connecting bolt 121 while being sleeved to the outer side of the circular pipe member 2 from the other end of the circular pipe member 2. And finally, the second connecting piece 12 is connected with the circular pipe fitting 2 in an interference manner to realize the fixed connection of the second connecting piece 12 and the circular pipe fitting 2.

Optionally, the connection joint further comprises a protrusion 13, one end of the protrusion 13 is fixedly arranged on the joint main body 1, and the other end of the protrusion 13 is detachably and fixedly arranged on the square pipe. In the present embodiment, the connection manner of one end of the protruding portion 13 and the joint main body 1 may be interference connection, riveting, or bolting, and interference connection is preferable. The other end of the projection 13 is preferably connected to the square tube by means of a bolt.

Specifically, the joint main body 1 and the protrusion 13 are both square in cross section, and the joint main body 1 and the protrusion 13 are both tubular structures. One end of the protruding part 13 is inserted into the joint main body 1 and one end of the protruding part 13 is connected with the joint main body 1 in an interference manner, so that the protruding part 13 is fixedly connected with the joint main body 1. The other end of the protruding part 13 is inserted into the square pipe and the other end of the protruding part 13 is connected with the square pipe in a sliding mode. The other end of the protruding part 13 is provided with a threaded connecting hole 131, and the corresponding position of the square pipe is provided with an oblong through hole. The square pipe is fixedly connected with the protruding part 13 by bolts. In this embodiment, the number of bolts may be 2, 4 or 6, preferably 4. The number of the screw coupling holes 131 may be 2, 4 or 6, and preferably 4. The number of oblong through holes is preferably 2, 4 or 6, preferably 4. Due to the arrangement of the long circular through hole, the depth of the other end of the protruding portion 13 inserted into the square pipe fitting can be adjusted, and the requirements of various working conditions are met.

It should be noted that the connection joint in this embodiment can not only satisfy the connection that the axis of the circular pipe 2 is perpendicular to the axis of the square pipe, but also satisfy the connection that the axis of the circular pipe 2 is not perpendicular to the axis of the square pipe. The person skilled in the art can, depending on the engineering practice, provide the joint body as a tubular part with a certain bending angle. For example, for convenience of explanation, if the included angle between the axis of the circular pipe 2 and the axis of the square pipe is an acute angle, and the acute angle is a, the bending angle of the joint body is a +90 °. When the axis of the round pipe fitting 2 is perpendicular to the axis of the square pipe fitting, the bending angle of the joint body is 180 degrees, namely the joint body is not bent. If the included angle between the axis of the circular pipe fitting 2 and the axis of the square pipe fitting is an obtuse angle, and the included angle of the obtuse angle is b, the bending angle of the joint body is 270-b.

This embodiment also provides a vehicle frame including the connection joint of this embodiment. By the arrangement of the connecting joints, the frame is less polluted in the manufacturing process, the stress distribution of the connecting joint positions of the frame is more uniform, and the risk of cracking or damage caused by stress concentration in the vicinity of the connecting joints is lower.

It is to be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. Attach fitting for connect circular pipe fitting (2) and square pipe fitting, its characterized in that includes:

the connector comprises a connector main body (1), wherein the connector main body (1) is provided with a through hole penetrating through the connector main body, one end of a round pipe fitting (2) penetrates through the through hole, and the square pipe fitting is fixedly connected with the connector main body (1);

the connecting piece comprises a first connecting piece (11), wherein the first connecting piece (11) is fixedly arranged on the circular pipe fitting (2), the first connecting piece (11) is arranged on one side of the joint main body (1), and the first connecting piece (11) is fixedly connected with the joint main body (1).

2. The connection joint according to claim 1, further comprising a second connecting member (12), wherein the second connecting member (12) is fixedly arranged on the circular pipe member (2), the second connecting member (12) is arranged on the other side of the joint body (1), and the second connecting member (12) is fixedly connected with the joint body (1).

3. The connection joint according to claim 2, characterized in that the first connecting piece (11) has a first connection hole through which the circular tube (2) is inserted, the hole wall of the first connection hole being provided with a first internal thread, the first connecting piece (11) being screwed with the circular tube (2).

4. The connection joint according to claim 3, wherein the second connecting member (12) has a second connecting hole (123), the circular pipe member (2) is inserted into the second connecting hole (123), a hole wall of the second connecting hole (123) is provided with a second internal thread, and the second connecting member (12) is screwed with the circular pipe member (2).

5. The connection joint according to claim 4, wherein the first internal threads and the second internal threads are oppositely threaded.

6. The connection joint according to claim 1, further comprising a protrusion (13), wherein one end of the protrusion (13) is fixedly disposed on the joint body (1), and the other end of the protrusion (13) is detachably fixedly disposed on the square pipe.

7. The connection joint according to claim 6, wherein the number of the protrusions (13) is two, one end of each of the two protrusions (13) is fixedly disposed on the joint body (1), and the other end of each of the two protrusions (13) is detachably and fixedly disposed on each of the two square pipes.

8. Frame, comprising a circular tube (2) and a square tube, characterized in that it further comprises a connection joint according to claim 2.

9. Frame according to claim 8, characterized in that said first connector (11) is welded to said circular tube (2) and said second connector (12) is welded to said circular tube (2).

10. Frame according to claim 8, characterized in that said first connector (11) is in interference connection with said circular tube (2) and said second connector (12) is in interference connection with said circular tube (2).