WO2016019914A1

WO2016019914A1 - Expansion fastening connection structure and connection method, and expansion fastening connection assembly

Info

Publication number: WO2016019914A1
Application number: PCT/CN2015/086414
Authority: WO
Inventors: 杨东佐
Original assignee: 杨东佐
Priority date: 2014-08-08
Filing date: 2015-08-07
Publication date: 2016-02-11

Abstract

An expansion fastening connection structure, comprising an expansion fastening connection assembly (1), a parent component (2) and an attachment component (3). The expansion fastening connection assembly comprises a driving core piece (8) and an expansion sleeve (16) consisting of expansion pieces (26) encircling the driving core piece. Tapered surfaces (33) for expansion are provided on the expansion pieces, and a driving tapered surface (21) is provided on the driving core piece. Annular wedge-shaped holding grooves (18) are provided on a hole wall of the parent component. The expansion pieces comprise wedge-shaped holding portions (30) and positioning holding portions. When the expansion sleeve is in a fully expanded state, the wedge-shaped holding portions extend into the wedge-shaped holding grooves and form an engagement, and the expansion sleeve is connected and fixed to the parent component. Also provided is a connection method for the expansion fastening connection structure. The attachment component and the parent component are connected and fixed via a threaded fastening piece (10) passing through the attachment component and connecting to a threaded connecting portion of a core rod. A reliable connection is implemented in situations such as those having a large load, heavy vibrations or a high temperature.

Description

Expansion fastening connection structure and connection method, expansion fastening connection assembly

Technical field:

The invention relates to an expansion fastening connection structure and a connection method, an expansion fastening connection assembly, which can replace two or more objects mechanically and statically, instead of a screw connection and an expansion screw connection, and particularly relates to a joint for connecting to a mother body The thread on the member is easy to slide, can not be tapped, or the thread is damaged after repeated use, and then the thread is damaged, and the thread is very troublesome, and the expansion fastening structure and connection method of the two or more members, and the expansion fastening assembly.

Background technique:

The existing detachable mechanical static joints are generally threaded connections, keyed connections, pinned connections, expanded screw connections, etc., the most widely used being threaded connections.

The threaded connections need to be tightened. The connection force between the threaded nut and the bolt is mainly manifested by the static friction generated by the pre-tightening force when tightening the thread and the bolt. Therefore, for the threaded connection of key objects, the preload force must be controlled to ensure the reliability of the work. For the parent component, the threaded connection has the following defects, such as some materials can not be tapped, such as wood; some materials are easy to slide after tapping, such as aluminum; some components can not be tapped or tapped after the thread is slipped. The cost is particularly high.

Summary of the invention

The technical problem to be solved by the present invention is to overcome the problems in the prior art globally widely used detachable mechanically coupled parent member threaded joint technology. That is to say, the thread on the mother member is easy to slide, can not be tapped, or the thread is damaged after repeated use, and then the thread is very troublesome.

In order to solve the above technical problems, the present invention provides an expansion fastening structure and a connection method, an expansion fastening connection assembly, and an expansion piece and a parent member are coupled together by an abutting force in an axial direction.

An expansion fastening connection structure embodying the present invention includes an expansion fastening assembly, a parent member, and an attachment member; a hole is formed in the parent member, and a through hole is provided on the attachment member;

The expansion fastening connection assembly comprises a drive core member and two or more expansion members; the expansion member constitutes an expansion sleeve for holding the drive core member;

Providing an expansion cone for driving the expansion sleeve to expand on each of the expansion members;

a driving core member accommodating space is disposed in the expansion sleeve, and the expansion cone surface is disposed on the wall of the driving core member accommodating space;

Providing a driving cone surface on the driving core member that cooperates with the expansion taper on each of the expansion sleeves;

The utility model is characterized in that: the driving core member comprises a connecting core rod, an expansion driving member and a screw fastening connection;

The connecting core rod comprises a connecting core rod body, a threaded connecting portion is arranged at one end of the connecting core rod body; and a driving cone surface is arranged on the connecting core rod body;

Providing a driving cone on the expansion driving member and a through hole extending axially through the expansion driving member;

Providing an annular wedge-shaped resisting groove on the wall of the hole of the parent member;

Providing an axial positioning mechanism for axially positioning the expansion sleeve on the expansion sleeve or the parent member;

The expansion member includes an expansion member body, a wedge-shaped abutting portion radially protruding on the outer circumference of the expansion member body and engaging with the wedge-shaped abutting groove; and a corresponding wedge-shaped abutting portion on the expansion sleeve is circumferentially distributed to form a broken independent annular shape;

The connecting core rod passes through the driving core receiving space, the through hole of the expansion driving member, and the through hole of the attachment member are screwed with the screw fastening connector, and the expansion sleeve is completely accommodated in the hole on the female member, and is axially positioned The mechanism axially resists the positioning of the expansion fastening assembly, the wedge-shaped abutting portion is opposite to the corresponding wedge-shaped abutting groove; in the fully expanded state of the expansion sleeve, the wedge-shaped abutting portion extends into the corresponding wedge-shaped abutting groove to resist the formation of the card through the surface and the surface The expansion sleeve is fixedly coupled to the parent member; the attachment member is coupled to the parent member by screwing the threaded fastening member through the attachment member to the threaded connection of the connecting core rod.

As a modification of the first aspect, the shape of the wedge-shaped abutting portion on the cross section passing through the axis includes two guiding inclined faces, two straight portions respectively connected to the two guiding inclined faces and perpendicular to the axis of the expansion sleeve, respectively, and the two straight portions and the expansion body a pair of two hollow portions, the wedge-shaped abutting groove includes two guiding portions connected to the hole wall of the hole in the female member, two straight portions respectively connected to the two guiding portions and perpendicular to the axis of the hole in the female member, and a hollow portion connected to the two straight portions; the wedge-shaped resisting portion protrudes from the expansion member body to a height smaller than the depth of the wedge-shaped resisting groove.

As a modification of the second embodiment, in the fully expanded state of the expansion sleeve, the straight portion of the wedge-shaped abutting portion toward the attachment member abuts against the straight portion of the wedge-shaped abutment groove away from the side of the attachment member, and the hole wall of the expansion member body and the hole on the parent member Tight fit.

The wedge-shaped abutting portion and the wedge-shaped abutting groove of the structure have a connection abutting force completely in the axial direction, and the blocking effect is better. Moreover, the expansion member body and the hole wall of the hole on the female member can be tightly coupled to generate a static friction force, so that the connection force between the expansion sleeve and the female member includes not only the resisting force but also the static friction force, and the force on the wedge-shaped resisting portion is reduced. The connection effect is better.

As a modification of the first solution, the shape of the wedge-shaped abutting portion on the cross section passing through the axis is a pointed shape or a trapezoidal shape or an arc shape, and the shape of the wedge-shaped resisting groove on the cross section passing through the axis is a pointed shape or a trapezoid or arc engaged with the wedge-shaped resisting portion. The wedge-shaped abutting portion protrudes from the height of the expansion member body to be smaller than the depth of the wedge-shaped abutting groove, and the wedge-shaped abutting portion is in contact with the two inclined surface faces of the wedge-shaped abutting groove which are in contact with the oblique shape or the trapezoidal surface, or is contacted by the curved surface.

The tapered wedge-shaped abutting portion and the wedge-shaped abutting groove, or the trapezoidal wedge-shaped abutting portion and the wedge-shaped abutting groove, or the curved wedge-shaped abutting portion and the wedge-shaped abutting groove can completely match the axial direction of the female member, the attached member member and the expansion sleeve No gaps, reducing machining accuracy.

A connection method for an expansion fastening structure, the connection method comprising:

Providing an expansion fastening assembly comprising a drive core member and two or more expansion members; the expansion member forming an expansion sleeve for holding the drive core member;

Providing a mother member and an attached member that need to be coupled; a hole is formed in the parent member, and a through hole is provided in the attached member;

The drive core member includes a connecting core rod, the connecting core rod includes a threaded connection portion; the expansion fastening connection assembly further includes a threaded fastening connector that cooperates with the threaded connection portion;

Providing a hole in the parent member, and providing a through hole in the body member;

The expansion member includes an expansion member body, and a wedge-shaped abutting portion radially protruding on the outer circumference of the expansion member body and engaging with the wedge-shaped abutting groove;

The driving core member is installed in the driving core member accommodating space, the expansion sleeve is only installed in the hole in the female member, the axial positioning mechanism axially resists the positioning of the expansion sleeve, and the wedge-shaped resisting portion is opposite to the corresponding wedge-shaped resisting groove ;

The driving core member drives the expansion sleeve to expand, and the wedge-shaped resisting portion extends into the corresponding first wedge-shaped resisting groove of the female member to form a snap-fit by the surface and the surface, and the expansion sleeve is fixedly connected with the female member;

The attachment member is fixed to the female member by screwing the threaded fastening connector to the threaded connection of the connecting mandrel.

An expansion fastening assembly comprising a drive core member and two or more expansion members; the expansion member forming an expansion sleeve for holding the drive core member;

a driving cone surface for driving expansion of the expansion sleeve is disposed on the driving core member; the connecting core rod includes a driving cone, a threaded connecting portion engaged with the threaded fastening connector; and the expansion fastening connection assembly further includes a threaded connection portion a threaded fastening connector; a driving core housing accommodating space is disposed in the expansion sleeve, and a expansion cone surface matched with the driving cone is disposed on the wall of the driving core housing accommodating space;

Each of the expansion members includes an expansion member body that cooperates with a hole in the female member, and a wedge-shaped abutting portion that engages with an annular wedge-shaped abutment groove on the hole wall of the hole in the female member is protruded on the outer circumference of the expansion member body; The corresponding wedge-shaped resisting portions are circumferentially distributed to form a broken independent ring.

As an improvement of the sixth solution, the spring further comprises a spring receiving groove radially on the outer peripheral surface of each of the expansion members, and the expansion members of the two or more petals are combined by the spring to form an expansion sleeve, and the spring is completely accommodated in the spring capacity. In the slot, the driving core member is installed in the driving core housing accommodation space.

The driving core member is installed in the accommodating space of the driving core member, and then the expansion members of the two lobes or more are assembled by the spring to form the expansion sleeve so as not to be separated, and the expansion fastening assembly is assembled at the factory, and during transportation. It won't spread out, it's more convenient, fast and easy to use.

As an improvement of the sixth solution, the driving core member includes a connecting core rod; the connecting core rod includes a connecting core rod body protruding from the connecting and expanding core body for driving the expansion and contraction expansion and contraction of the expansion sleeve; The driving taper surface of the expansion sleeve is disposed on a side facing away from the positioning resisting portion, and a contracting conical recessed portion for contracting the expansion sleeve is formed on a side facing the positioning resisting portion, and the driving taper surface and the contraction on the connecting core rod are used The taper recesses have the same taper direction; the drive core receiving space includes an expansion and contraction receiving groove that cooperates with the expansion and contraction projection of the connecting core rod, and the expansion and contraction receiving groove faces away from the groove wall facing the positioning resisting portion Forming an expansion for driving the expansion sleeve to expand and cooperate with the driving cone of the connecting core rod The expansion taper surface, the expansion and contraction accommodating groove faces away from the groove wall of the positioning abutting portion, and forms a contraction taper surface for contracting the expansion sleeve and engaging the contracting conical recessed portion of the connecting mandrel.

The conical recessed portion for contraction and the tapered taper surface are provided. When disassembling, the conical recessed portion of the connecting mandrel is engaged with the conical taper on the expansion sleeve to gather the expansion sleeve and expand the sleeve. The wedge-shaped abutting portion is completely separated from the wedge-shaped abutting groove on the female member, and the disassembly is easier and more reliable, ensuring that the expansion sleeve is not damaged during the disassembly process.

As a further improvement of the schemes six to eight, the single wedge-shaped abutting portion includes a guiding portion, a resisting portion connected to the guiding portion, and a connecting portion connecting the abutting portion and the expansion member body, the abutting portion being perpendicular to the axis of the expansion member.

As a co-implementation of the schemes six to eight, the shape of the single wedge-shaped abutment on the section passing through the axis is a pointed shape or a trapezoidal shape or an arc shape.

The beneficial effects of the invention are:

One is that in the fully expanded state of the expansion sleeve, the wedge-shaped abutting portion projects into the corresponding wedge-shaped abutting groove to form a snap by the surface and the surface, and the expansion sleeve is fixedly connected with the parent member. The connection force between the expansion sleeve and the female member in the expansion fastening structure is mainly the resistance of the female member to the expansion member, rather than the pre-tightening static friction force of the threaded connection or the expansion static friction force of the expansion screw, and the connection force is large. .

Second, the wedge-shaped abutting portion of the expansion sleeve and the corresponding wedge-shaped abutment groove of the parent member are previously processed, and the wedge-shaped abutting portion is not formed by expansion deformation of the expansion sleeve. The expansion sleeve is designed to have two lobes (in which the expansion sleeve has the best effect of three lobes). The expansion sleeve does not deform during the expansion process. The first is that the number and shape of the wedge-shaped resisting portion can be freely designed according to the force condition. The position of the wedge-shaped resisting groove on the female member is also designed in advance according to the structure of the expansion sleeve, so that it can withstand a large external force as needed and the connection is reliable; the third is a wide range of use, and there is no requirement for the material hardness of the parent member, There is no need for a large coefficient of friction between the expansion sleeve and the parent member, which is completely replaceable for use with screws.

Third, because the wedge-shaped resisting grooves on the parent member are independent, not threaded, the expansion sleeve and the parent member are not loosened (not reversed loose), the female member is not damaged by the threaded wire, the wedge-shaped resisting portion and The probability of the wedge-shaped abutment groove being damaged and disengaging during operation is almost zero, so the connection between the expansion sleeve and the parent member is very reliable.

Fourth, since the expansion sleeve is not deformed during the expansion process, the expansion sleeve is not embedded in the parent member to cause the deformation of the parent member. The radial connection force between the expansion sleeve and the parent member is very small, and the wedge-shaped resist groove on the parent member is in operation. It is also almost impossible to damage; therefore, when disassembling, it is only necessary to take the driving core member out of the expansion position, and the expansion fastening joint assembly can be taken out from the mother member and the attachment member without requiring a large force, and the expansion is not damaged when disassembled. The connection assembly is tightened and the parent member is not damaged. Not only the expansion fastening assembly can be reused many times, but also the parent member is not damaged or scrapped due to damage to the position where the expansion joint is connected.

Fifthly, in the present invention, the cooperation between the driving taper surface and the expansion taper surface only needs to have the same taper of the driving taper surface and the expansion taper surface to realize the function of driving the core member to drive the expansion sleeve expansion, and the curvature thereof may be different. .

DRAWINGS

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a front elevational view showing an expanded fastening structure of an embodiment 1 of the present invention in an unexpanded state of an expansion sleeve.

Fig. 2 is a cross-sectional view taken along line A-A of Fig. 1;

Fig. 3 is a perspective view showing the expansion fastening joint assembly of the first embodiment of the present invention.

4 is a perspective exploded view of the expansion fastening assembly of Embodiment 1 of the present invention.

Fig. 5 is a front elevational view showing the expansion-fastening connection structure of the first embodiment of the present invention in a state in which the expansion sleeve is fully expanded.

Fig. 6 is a cross-sectional view taken along line B-B of Fig. 5;

Figure 7 is a cross-sectional view showing the center position of one of the expansion members of the expansion joint in the unexpanded state of the expansion sleeve according to the second embodiment of the present invention.

Fig. 8 is an enlarged schematic view showing a portion I of Fig. 7;

Figure 9 is a perspective view showing the expansion fastening assembly with a wave spring according to Embodiment 3 of the present invention.

Figure 10 is a cross-sectional view showing the center position of one of the expansion members of the expansion joint of the embodiment 3 of the present invention in an unexpanded state of the expansion sleeve.

Figure 11 is a perspective view showing the expansion fastening assembly with a wave spring according to Embodiment 4 of the present invention.

Figure 12 is a cross-sectional view showing the center position of one of the expansion members of the expansion joint of the embodiment 4 of the present invention in an unexpanded state of the expansion sleeve.

Figure 13 is a perspective view showing the expansion fastening assembly with a wave spring according to Embodiment 5 of the present invention.

Figure 14 is a cross-sectional view showing the center of the expansion joint of the embodiment 5 of the present invention in the unexpanded state of the expansion sleeve over the center of one of the expansion members.

Figure 15 is a perspective view showing the expansion fastening assembly with a wave spring according to Embodiment 6 of the present invention.

Figure 16 is a cross-sectional view showing the center position of one of the expansion members of the expansion joint of the embodiment 6 of the present invention in an unexpanded state of the expansion sleeve.

detailed description

Example 1

As shown in FIGS. 1, 2, and 3, as shown in FIGS. 1 to 6, an expansion fastening structure includes an expansion fastening joint assembly 1, a female member 2, an attachment member 3, and a coupling screw 10. An axial positioning mechanism for axially positioning the expansion sleeve.

A stepped circular blind hole 6 formed of a large hole 4 and a small hole 5 is provided in the mother member 2, and a circular through hole 7 is provided in the attached member 3.

The expansion fastening assembly 1 includes a drive core member, an expansion sleeve 16 composed of the same expansion member 26 having the same three-valve structure for holding the drive core member, a spring 27, and a spring 28.

As shown in FIGS. 2 and 4, the driving core member includes a driving core rod 8 and an expansion driving member 9.

The expansion driving member 9 includes a driving cone 11, a cylindrical optical rod portion 12 connected to the large end of the driving cone 11, and an outer peripheral surface resisting portion 13 radially protruding from the end portion of the straight beam portion 12, which is disposed at the axial center position. The threaded hole 14 is provided on the outer circumferential surface of the driving cone 11 to engage with the coupling rib 15 of the coupling slit of the adjacent two-lobed expansion member 26 of the expansion sleeve 16. The stepped blind hole 6 of the parent member 2 is close to the large hole 4 of the attachment member 3 for mounting the expansion sleeve 16, and the distance from the attachment member 3 is that the drive core rod 8 avoids the driving of the core rod 8 during the expansion process of the expansion sleeve 16. The hole 5, the outer diameter of the abutting portion 13 of the expansion drive member 9 is larger than the diameter of the small hole 5 of the step blind hole 6. The stepped surface 17 of the stepped blind hole 6 forms an axial positioning mechanism that axially positions the expansion sleeve 16. An independent annular wedge-shaped abutment groove 18 is provided in the wall of the large hole 4 of the stepped circular blind hole 6.

The drive spindle 8 includes a small rod 20 provided with an externally threaded portion 19 that cooperates with a threaded bore 14 of the expansion drive member 9, a drive cone 21 with a small end connected to the small rod 20, and a cylinder connected to the large end of the drive cone 21 The optical rod portion 22 is connected to the optical rod portion 22 and radially protrudes from the annular resist portion 23 of the optical rod portion 22. On the end surface of the resist portion 23, a screw connection hole 24 and a blind hole 25 are provided. The drive tool extends into more than two circular blind holes 25 as the drive expansion sleeve 16 expands. The axial length of the driving cone 11 is equal to the axial length of the driving cone 21, and the taper is the same, thereby achieving synchronous relative direction driving.

The expansion member 26 includes an expansion member body 29 having an outer peripheral surface that cooperates with the large hole 4 of the parent member 2, and a wedge-shaped abutting portion 30 that radially protrudes from the outer periphery of the expansion member body 29 to engage the wedge-shaped abutment groove 18, and is provided. A spring accommodating groove 31 and a spring accommodating groove 32 are formed on the outer peripheral surface of the expansion member body 29. The outer diameter of the expansion member body 29 is equal to the diameter of the large hole 4 of the parent member 2. The expansion member 26 and the driving expansion rod 9 and the driving core rod 8 constitute an expansion sleeve 16 , and the driving core housing space is arranged in the expansion sleeve 16 .

The shape of the single wedge-shaped abutting portion 30 on the cross section passing through the axis is a trapezoid; the shape of the wedge-shaped abutting groove 18 on the cross section passing through the axis is a trapezoidal shape that cooperates with the wedge-shaped resisting portion 30.

As shown in FIG. 4, in the unexpanded state of the expansion sleeve 16, the driving core accommodation space includes the expansion taper 33 of the drive cone 11 of the combined expansion drive member 9, and the small end of the expansion taper 33 and The cylindrical curved surface 34 of the partial small rod 20 of the driving core rod 8 is joined to the cylindrical curved surface 34 and converges the expansion taper 35 of the driving cone 21 of the driving core rod 8. All of the cylindrical curved surfaces on the expansion sleeve 16 and the expansion tapered surface are broken at the joint position of the adjacent two expansion members 26.

In the unexpanded state of the expansion sleeve 16, the threaded hole 14 of the expansion drive member 9 is screwed onto the threaded portion of the small rod 20 of the drive core rod 8, and the small end of the drive cone 11 of the expansion drive member 9 is driven to the drive core rod 8. The axial distance between the small ends of the cone 21 cooperates with the axial length of the cylindrical curved surface 34. The three-lobed expansion member 26 is hug on the expansion driving member 9 and the driving core rod 8. The rotation preventing rib 15 of the expansion driving member 9 is installed in the coupling slit of the adjacent two-lobed expansion member 26, and passes through the expansion taper 33. The positioning expansion member 26 is engaged with the expansion driving member 9 and the expansion tapered surface 35 on the driving cone 11, and the expansion cone 26 and the driving core rod 8 are positioned on the driving cone 21. The three-valve expansion member 26 is not automatically separated from the expansion drive member 9 and the drive core rod 8 by the spring 27, the spring 28, and the spring 27 is completely accommodated in the spring receiving groove 31, and the spring 28 is completely accommodated in the spring capacity. Placed in slot 32. The expansion sleeve 16 is provided with one end of the wedge-shaped resisting portion 30 extending into the large hole 4 of the female member 2. The expansion sleeve 16 is completely received in the large hole 4 in the female member 2, and the resisting portion 13 of the expansion driving member 9 is resisted. The expansion sleeve 16 is axially positioned on the step surface 17 of the stepped circular blind hole 6 of the parent member 2, the wedge-shaped abutment portion 30 being opposed to the corresponding wedge-shaped abutment groove 18.

As shown in FIG. 6, in the fully expanded state of the expansion sleeve 16, the wedge-shaped abutting portion 30 extends into the corresponding wedge-shaped resisting groove 18, and the two inclined surfaces of the trapezoid are matched to each other to form a snap; the expansion sleeve 16 is fixedly connected with the female member 2; together. The core member and the drive core rod 8 are mounted in position on the end face of the drive sleeve 8 against the end face of the expansion sleeve 16. The outer peripheral surfaces of the corresponding expansion member bodies 29 on the expansion sleeve 16 are distributed on the same circumferential surface, and are tightly fitted with the large holes 4 of the parent member 2. The outer peripheral surface of the wedge-shaped abutting portion 30 on the expansion sleeve 16 is distributed on the same circumference to form a separate annular shape in which the adjacent two-lobed expansion member 26 is broken.

The attachment member 3 is connected and fixed to the parent member 2 by screwing the attachment member 3 through the attachment member 3 to the threaded connection hole 24 of the drive core rod 8.

As shown in FIG. 4 and FIG. 6, a connection method of an expansion fastening structure includes the following steps:

The threaded hole 14 of the expansion drive member 9 is screwed onto the threaded portion of the small rod 20 of the drive core rod 8, and the small end of the drive cone 11 of the expansion drive member 9 to the small end of the drive cone 21 of the drive core rod 8 The axial distance between the two is matched with the axial length of the cylindrical curved surface 34;

The three-lobed expansion member 26 is hug on the expansion driving member 9 and the driving core rod 8. The rotation preventing ribs 15 of the expansion driving member 9 extend into the joint gap of the adjacent two-lobed expansion members 26, and pass through the expansion taper 33. Cooperating on the driving cone 11 to position the expansion member 26 and the expansion driving member 9, the expansion cone 35 and the driving cone 21 to position the expansion member 26 and the driving core rod 8;

The spring 27 is mounted in the spring receiving groove 31, and the spring 28 is mounted in the spring receiving groove 32. The three-valve expansion member 26 and the expansion driving member 9 and the driving core rod 8 are not automatically separated and joined together to complete the expansion and fastening connection. Connection of component 1;

One end of the expansion sleeve 16 provided with the wedge-shaped abutting portion 30 projects into the large hole 4 of the parent member 2, and the expansion sleeve 16 is completely accommodated in the large hole 4 on the parent member 2, and the abutting portion 13 of the expansion driving member 9 Resisting the expansion sleeve 16 on the step surface 17 of the stepped circular blind hole 6 of the parent member 2 such that the wedge-shaped abutting portion 30 on the expansion sleeve 16 is opposite to the corresponding wedge-shaped abutment groove 18 on the parent member 2;

Rotating the driving rod 8, the expansion driving member 9 is synchronously moved by the screwing engagement with the driving core rod 8, and the driving cone 21 of the expansion rod driving member 9 slides on the expansion taper surface 33 to drive the driving cone 21 of the core rod 8. The expansion sleeve 16 is slidably driven to expand on the expansion cone 35, and each of the expansion members 26 moves radially, and the wedge-shaped abutting portions 30 extend into the corresponding wedge-shaped resisting grooves 18 of the parent member 2 to resist each other to form a snap;

The abutting portion 23 of the driving core rod 8 abuts against the end surface of the expansion sleeve 16, the expansion driving member 9 and the driving core rod 8 are mounted in position, the expansion sleeve 16 is fully expanded, the rotation driving the core rod 8 is stopped, the driving core member stops driving; The sleeve 16 is fixedly coupled to the parent member 2;

Example 2

As shown in FIGS. 7 and 8, unlike the first embodiment, the axial positioning mechanism is a positioning spring 60. A spring receiving hole 63 is formed in an end surface of the expansion driving member 61 facing the hole bottom of the circular blind hole 65 of the female member 62. The spring receiving hole 63 communicates with the screw hole 64 of the expansion driving member 61, and the spring receiving hole 63 The aperture is larger than the aperture of the threaded bore 64. The positioning spring 60 is mounted between the bottom of the hole of the blind hole 65 on the parent member 62 and the spring receiving hole 63 of the expansion drive member 61. When the positioning spring 60 abuts against the bottom of the blind hole 65, the expansion driving member 61 abuts against the positioning spring 60, and in the free state of the positioning spring 60, the wedge-shaped resisting portion 67 on the expansion sleeve 66 and the corresponding wedge-shaped resisting member on the female member 62 Slot 68 is facing.

As shown in Fig. 8, the single wedge-shaped abutment portion 67 includes a guide portion 69 provided with two inclined faces formed by chamfers, and is connected to the guide portion 69, provided with two vertical face resisting segments 70, connecting the resisting segments 70 and expanding The body body 71 is provided with a connecting section 72 of two inclined faces formed by chamfering, and the resisting section 70 is perpendicular to the axis of the expanding member 73. The single wedge-shaped abutment groove 68 includes two guide faces 74 that are connected to the wall of the blind hole 65 of the parent member 62, and a vertical face 75 that is connected to the two guide faces 74 and that is perpendicular to the axis of the blind hole 65 on the parent member 62. The two connection faces 76 for avoiding the vertical surface 75 are connected.

In the fully expanded state of the expansion sleeve 66 (not shown), the wedge-shaped abutting portion 67 extends into the corresponding wedge-shaped abutment groove 68 to resist the engagement with the vertical surface 75 by the abutting portion 70, and the guide portion 69 and the escape connection surface 76 are formed. With the clearance fit, the connecting section 72 is in clearance fit with the two guiding faces 74.

Example 3

As shown in FIG. 9 and FIG. 10, unlike the first embodiment, the expansion member 100 includes an expansion member body 101 having a cylindrical curved outer peripheral surface, and a projection portion radially extending along an outer peripheral surface of one end portion of the expansion member body 101. A locating portion 104 that axially protrudes from the outer peripheral surface of the other end portion of the expander body 101 and that axially positions the expansion sleeve 103 is formed. An annular groove 107 is formed in the wall of the circular hole 106 in which the parent member 105 is engaged with the expansion member body 101, and the circular groove 107 forms a first recessed portion. A spring receiving groove 108 is formed on the outer circumference of the first abutting convex portion 102; and a spring receiving groove 109 is provided on the outer circumference of the positioning portion 104. In the fully expanded state of the expansion sleeve 103, the outer circumferential surface of the positioning portion 104 of the expansion sleeve 103 is distributed on the same circumferential surface, and the outer circumferential surface of the first resisting convex portion 102 is distributed on the same circumferential surface, and the first resisting convex portion 102, the outer peripheral surface of the expansion member body 101 and the positioning portion 104 are concentric, the outer diameter of the positioning portion 104 is larger than the outer diameter of the first resisting convex portion 102, and the first resisting convex portion 102 and the positioning portion 104 are formed on the adjacent two expansion members 100. Combine the ring with a broken position.

The driving core member includes a connecting core rod 110, an expansion driving member 111, and a nut 112.

The connecting core 110 includes a driving cone 113, a circular rod 114 connected to the small end of the driving cone 113, a screw 115 connected to the round rod 114, and three radial directions provided on the outer peripheral surfaces of the driving cone 113 and the round rod 114. Uniformly distributed ribs 116. The ribs 116 serve to prevent the connecting mandrel 110 from rotating relative to the expansion member 100 and increasing the beam portion coupling force of the drive cone 113 and the screw 115.

The expansion driving member 111 includes a driving cone 117, a cylindrical optical rod portion 118 connected to the large end of the driving cone 117, and a threaded through hole 119 provided at the axial center position, which is evenly distributed in the axial direction on the end surface of the optical rod portion 118. Round blind hole 120. The drive tool extends into the two or more circular blind holes 120 when the expansion sleeve 103 is inflated.

On the end surface of the parent member 105 facing the attachment member 127, a receiving hole 122 is provided which communicates with the circular hole 106 for completely accommodating the positioning portion 104 of the wave spring 121 and the expansion sleeve 103.

The connection method is different from that of Embodiment 1:

One end of the wave spring 121 passing through the expansion sleeve 103 and provided with the first resisting protrusion 102 is mounted outside the expansion body 101;

The expansion sleeve 103 is provided with one end of the first abutting protrusion 102 extending into the circular hole 106 of the parent member 105. The expansion sleeve 103 is completely received in the circular hole 106 in the parent member 105, and is abutted by the wave spring 121. On the bottom surface of the accommodating hole 122, the positioning portion 104 of the expansion sleeve 103 axially positions the expansion sleeve 103 against the wave spring 121, so that the first abutment protrusion 102 on the expansion sleeve 103 faces the corresponding member on the parent member 105. Circular groove 107;

The rotary expansion driving member 111, the connecting core rod 110 is synchronously moved in synchronization with the expansion driving member 111, and the driving cone 113 of the expansion driving member 111 slides on the expansion tapered surface 125 to connect the driving cone 113 of the core rod 110. The expansion sleeve 103 is slidably driven to expand on the expansion cone 126, and each of the expansion members 100 moves radially. The first abutment protrusions 102 extend into the corresponding annular grooves 107 of the parent member 105 through the abutment surface 123 and the abutment surface. 124 mutually resisting to form a snap;

When the expansion member 100 is no longer moving in the radial direction, the expansion driving member 111 and the connecting core rod 110 are mounted in position, the expansion sleeve 103 is fully expanded, the rotary expansion driving member 111 is stopped, the driving core member stops driving, and the expansion sleeve 103 is connected to the parent member 105. Fixed together, and the drive cone 113 connecting the core rod 110 is axially resisted by the expansion cone 126, the screw 115 connecting the core rod 110 protrudes from the parent member 105;

The attachment member 127 is passed through the screw 115 connecting the core rod 110 to the parent member 105, and the nut 112 is screwed onto the screw 115 and abutted against the attachment member 127, and the connection core rod 110 is inflated. The sleeve 103 is axially resisted, and the expansion sleeve 103 is axially resisted by the parent member 105 by the first abutting protrusion 102 engaging with the circular groove 107 on the parent member 105, and the attachment member 127 is axially resisted by the nut 112, and is expanded. The attachment assembly secures the attachment member 127 to the parent member 105.

Example 4

As shown in FIG. 11 and FIG. 12, unlike the first embodiment, the expansion member 150 includes an expansion member body 151 whose outer peripheral surface has a cylindrical curved surface, and a circle which is radially protruded along the intermediate position of the outer peripheral surface of the expansion member body 151. The annular projection 152 and the annular projection 152 form a resisting projection. Only one circular groove 155 is provided in the wall of the hole of the circular blind hole 154 where the parent member 153 is engaged with the expansion member body 151, and the circular groove 155 forms a resisting recess.

The expansion fastening assembly also includes a tapered nut 156. An external thread portion 159 that cooperates with the tapered nut 156 is provided at one end of the drive core rod 157 toward the attachment member 158.

In the unexpanded state of the expansion sleeve 160, the expansion sleeve 160 abuts against the bottom of the hole of the circular blind hole 154 of the parent member 153, and the annular projection 152 of the expansion sleeve 160 faces the circular groove 155 toward the surface of the attachment member 158. The faces of the attachment members 158 are facing each other.

In the fully expanded state of the expansion sleeve 160, the annular projection 152 extends into the circular groove 155 to form a snap. After the expansion sleeve 160 is fixed to the female member 153, the tapered nut 156 is screwed to the drive core 157. On the external thread portion 159, the attachment member 158 is abutted against the parent member 153, and is screwed into the threaded hole 163 of the driving core rod 157 through the circular through hole 162 of the attachment member 158 by the screw 161. The body member 158 is coupled and fixed to the parent member 153.

Example 5

As shown in FIGS. 13 and 14, unlike the third embodiment, four independent annular wedge-shaped resisting grooves 202 are provided in the blind hole 201 of the parent member 200. The expansion member 203 includes an expansion member body 204 having a cylindrical curved surface on the outer circumferential surface, and a diameter To the four-circle wedge-shaped resisting portion 205 protruding from the outer peripheral surface of the expansion member body 204 and the wedge-shaped abutment groove 202, the shape of the single wedge-shaped abutting portion 205 on the expansion member 203 is semi-circular in shape on the cross section passing through the axis; the parent member 200 The shape of the wedge-shaped abutment groove 202 on the wall of the circular blind hole 201 in the cross section passing through the axis is a semicircular arc shape that cooperates with the wedge-shaped abutting portion 205. In the fully expanded state of the expansion sleeve (the fully expanded state is not shown), the wedge-shaped abutting portion 205 is in contact with the wedge-shaped resisting groove 202 through two semi-circular arc surfaces.

The connecting core rod 206 includes a cylindrical driving core body 207, a threaded connecting portion 218 connected to the driving core rod body 207, and a resisting portion 208 protruding on the outer circumference of one end of the driving core rod body 207 and two identical structures. The expansion and contraction projection 209.

The expansion and contraction projection 209 is used to expand and contract the expansion sleeve 210. The expansion and contraction projection 209 includes a driving cone 211 disposed on a side facing away from the abutting portion 208 for driving the expansion sleeve 210 to be expanded, and is disposed on a side facing the resisting portion 208 to form a contraction for contracting the expansion sleeve 210. The light rod portion 213 that connects the driving cone 211 and the contracting tapered recess portion 212 is connected by the tapered recess portion 212, and the driving cone 211 coincides with the taper direction of the contracting tapered recess portion 212.

The inner side surface of the expansion member 203 is a cylindrical curved surface. The expansion and contraction accommodating groove 214 is provided on the inner side surface of the expansion member 203, and the expansion and contraction accommodating groove 214 is formed away from the groove wall of the mother member 200 to drive the expansion sleeve 210 to expand. An expansion taper 215 that cooperates with the driving cone 211 of the connecting core rod 206, and the expansion and contraction receiving groove 214 forms a contracting cone for contracting the expansion sleeve 210 and the connecting core rod 206 toward the groove wall of the parent member 200. The converging tapered surface 216 to which the concave portion 212 is fitted, and the conical taper surface 215 and the constricting tapered surface 216 and the cylindrical curved surface 217 that fits the polished rod portion.

Example 6

As shown in FIGS. 13 and 14, unlike the third embodiment, three independent annular wedge-shaped resisting grooves 251 are provided in the blind hole 255 of the parent member 250. The expansion member 252 includes an expansion member body 253 having a cylindrical curved surface on the outer peripheral surface, a three-circle wedge-shaped resisting portion 254 radially protruding from the outer peripheral surface of the expansion member body 253 and the wedge-shaped abutment groove 251, and a single wedge-shaped resisting portion on the expansion member 252. The shape of 254 on the section passing through the axis is a triangle; the shape of the wedge-shaped abutment groove 251 on the hole wall of the circular blind hole 255 of the parent member 250 is a triangle that fits the wedge-shaped abutment portion 254 in a cross section passing through the axis. In the fully expanded state of the expansion sleeve 268 (the fully expanded state is not shown), the wedge-shaped abutting portion 254 is in contact with the wedge-shaped abutment groove 251 through the two inclined faces of the triangle.

The connecting core rod 256 includes a driving cone 257, a resisting portion 258 connected to the large end surface of the driving cone 257 and radially projecting the large end of the driving cone 257, a circular rod portion 259 connected to the small end of the driving cone 257, and a circle The screw portion 260 to which the polished rod portion 259 is connected is provided on the outer peripheral surface of the driving cone 257.

The expansion drive member 262 includes a drive cone 263, a resisting portion 264 connected to the large end of the drive cone 263 and radially projecting the large end of the drive cone 263, and a circular through hole 265 disposed at the axial center.

The connection method is different from the embodiment:

The expansion member 252 is held together by the spring 266 and the spring 267 to form an expansion sleeve 268;

The screw portion 260 connecting the core rod 256 is sequentially passed through the expansion sleeve 268, the circular through hole 265 of the expansion driving member 262, the wave spring 269, and the attachment member 270, and then the attachment member 270 is protruded toward the connecting core rod 256 away from the parent member. The direction of 250 is pulled outward, so that the connecting core 256, the expansion member 252, the expansion driving member 262, the wave spring 269, and the attachment member 270 abut each other, and the wedge-shaped resisting portion 254 slightly deviates from the wedge-shaped resisting groove 251 toward the direction of the parent member 250. ;

Then, the washer 271 and the nut 272 are mounted on the connecting core rod 256, and the nut 272 is rotated relative to the screw portion to drive the expansion sleeve 268 to expand, so that the wedge-shaped resisting portion 254 enters into the wedge-shaped resisting groove 251 to form a snap, and the attached member is 270 is coupled to the parent member 250.

Claims

An expansion fastening connection structure, comprising an expansion fastening connection assembly, a parent member, and an attachment member;

Providing a hole in the parent member, and providing a through hole in the body member;

The expansion fastening connection assembly comprises a drive core member, two or more expansion members; the expansion member constitutes an expansion sleeve for holding the drive core member;

Providing an expansion cone for driving the expansion sleeve to expand on each of the expansion members;

a driving core member accommodating space is disposed in the expansion sleeve, and the expansion cone surface is disposed on a wall of the driving core member accommodating space;

Providing a driving cone surface on the driving core member that cooperates with the expansion taper on each of the expansion sleeves;

The driving core member comprises a connecting core rod, an expansion driving member and a screw fastening connector;

The connecting core rod includes a connecting core rod body, and a threaded connecting portion is disposed at one end of the connecting core rod body; and the driving cone surface is disposed on the connecting core rod body;

Providing the driving cone surface and the through hole extending through the expansion driving member in the axial direction;

Providing an annular wedge-shaped resisting groove on the wall of the hole of the parent member;

Providing an axial positioning mechanism for axially positioning the expansion sleeve on the expansion sleeve or the parent member;

The expansion member includes an expansion member body, a wedge-shaped abutting portion radially protruding on an outer circumference of the expansion member body and engaging with the wedge-shaped abutting groove; and a corresponding wedge-shaped abutting portion on the expansion sleeve is circumferentially distributed to form a disconnected independent annular shape;

The connecting core rod passes through the driving core receiving space, the through hole of the expansion driving member, and the through hole of the attachment member are screwed with the screw fastening connector, and the expansion sleeve is completely accommodated in the hole on the female member, and is axially positioned The mechanism axially resists the positioning of the expansion fastening assembly, the wedge-shaped abutting portion is opposite to the corresponding wedge-shaped abutting groove; in the fully expanded state of the expansion sleeve, the wedge-shaped abutting portion extends into the corresponding wedge-shaped abutting groove to resist the formation of the card through the surface and the surface And the expansion sleeve is fixedly connected with the parent member;

The attachment member is affixed to the parent member by screwing the threaded fastening connector through the attachment member to the threaded connection of the connecting mandrel.
The expansion fastening structure according to claim 1, wherein the shape of the wedge-shaped abutting portion on the cross section passing through the axis comprises two guiding slopes respectively connected to the two guiding slopes and the expansion sleeve. Two straight portions perpendicular to the axis, respectively, two avoiding portions connected to the two straight portions and the expansion member body, the wedge-shaped resisting grooves including two guiding portions connected to the hole wall of the hole in the female member, respectively, and the two guiding portions Two straight portions connected to and perpendicular to the axis of the hole in the parent member, and a hollow portion connected to the two straight portions; the wedge-shaped resisting portion protrudes from the height of the expansion member body to be smaller than the depth of the wedge-shaped resisting groove.
An expansion fastening joint assembly according to claim 2, wherein in the fully expanded state of the expansion sleeve, the wedge-shaped abutting portion abuts against the straight portion of the attachment member against the straight portion of the wedge-shaped abutment groove away from the side of the attachment member. The expansion member body is tightly fitted to the hole wall of the hole in the parent member.
An expansion fastening joint structure according to claim 1, wherein said wedge-shaped abutting portion has a shape of a pointed shape or a trapezoidal shape or an arc shape on a cross section passing through the axis, and said wedge-shaped resisting groove passes through The shape of the cross section of the axis is a pointed shape or a trapezoidal shape or an arc shape matched with the wedge-shaped abutting portion, the height of the wedge-shaped resisting portion protruding from the expansion member body is smaller than the depth of the wedge-shaped abutting groove, and the wedge-shaped abutting portion and the wedge-shaped resisting groove are over-curved The beveled surface contacts or the two beveled faces of the trapezoidal surface contact or are contacted by the curved surface.
A connection method for an expansion fastening structure, characterized in that:

An expansion fastening connection assembly is provided, the expansion fastening connection assembly comprising a drive core member, two or more expansion members;

The expansion member constitutes an expansion sleeve for holding the driving core member;

Providing a mother member and an attached member that need to be coupled; a hole is formed in the parent member, and a through hole is provided in the attached member;

The drive core member includes a connecting core rod, the connecting core rod includes a threaded connection portion; the expansion fastening connection assembly further includes a threaded fastening connector that cooperates with the threaded connection portion;

Providing a hole in the parent member, and providing a through hole in the body member;

Providing an annular wedge-shaped resisting groove on the wall of the hole of the parent member;

Providing an axial positioning mechanism for axially positioning the expansion sleeve on the expansion sleeve or the parent member;

The expansion member includes an expansion member body, a wedge-shaped abutting portion radially protruding on an outer circumference of the expansion member body and engaging with the wedge-shaped abutment groove;

The driving core member is installed in the driving core member accommodating space, the expansion sleeve is only installed in the hole in the female member, the axial positioning mechanism axially resists the positioning of the expansion sleeve, and the wedge-shaped resisting portion is opposite to the corresponding wedge-shaped resisting groove ;

The driving core member drives the expansion sleeve to expand, and the wedge-shaped resisting portion extends into the corresponding first wedge-shaped resisting groove of the female member to form a snap-fit by the surface and the surface, and the expansion sleeve is fixedly connected with the female member;

The attachment member is fixed to the female member by screwing the threaded fastening connector to the threaded connection of the connecting mandrel.
An expansion fastening assembly comprising a drive core member and two or more expansion members; the expansion member forming an expansion sleeve for holding the drive core member;

Providing a drive cone on the drive core member for driving expansion of the expansion sleeve; the connecting core rod includes the drive cone, a threaded connection portion engaged with the threaded fastening connector; and the expansion fastening connection The assembly also includes a threaded fastening connector that mates with the threaded connection;

a driving core member accommodating space is disposed in the expansion sleeve, and a expansion taper surface matched with the driving cone is disposed on the wall of the driving core member accommodating space;

The utility model is characterized in that: the per-valve expansion member comprises an expansion member body that cooperates with a hole in the parent member, and an annular wedge-shaped abutment groove on the outer wall of the expansion member body is convexly disposed on the hole wall of the hole on the female member. The wedge-shaped abutting portion; the corresponding wedge-shaped abutting portion on the expansion sleeve is circumferentially distributed to form a broken independent ring shape.
An expansion fastening joint assembly according to claim 6, further comprising a spring, a spring receiving groove is radially provided on an outer peripheral surface of each of the expansion members, and the expansion members of the two or more petals are held by the spring. The expansion sleeve is formed together, and the spring is completely accommodated in the spring receiving groove, and the driving core member is installed in the driving core receiving space.
An expansion fastening joint assembly according to claim 6, wherein said driving core member comprises a connecting core rod; said connecting core rod comprises a connecting core rod body protruding from said connecting core rod body for driving expansion a sleeve-expanding and contracting expansion and contraction projection; the drive cone surface for driving the expansion sleeve expansion is disposed on a side facing away from the positioning abutting portion, and a contraction for contracting the expansion sleeve is formed on a side facing the positioning resisting portion With a tapered recess, the driving taper surface on the connecting core rod is aligned with the taper direction of the constricting recessed portion for contraction; the driving core member accommodating space includes expansion and contraction with the expansion and contraction projection portion of the connecting core rod With the accommodating groove, the expansion and contraction accommodating groove faces away from the groove wall facing the positioning abutting portion to form the expansion taper for expanding the expansion sleeve and engaging with the driving taper surface of the connecting mandrel, and the expansion and contraction accommodating groove The groove wall facing away from the positioning abutting portion forms a converging tapered surface for contracting the expansion sleeve and engaging the constricted recessed portion of the connecting mandrel.
An expansion fastening joint assembly according to any one of claims 6 to 8, wherein a single said wedge-shaped abutting portion comprises a guiding portion, an abutting portion connected to the guiding portion, and said abutting portion is connected And a connecting section of the expansion body, the abutting section being perpendicular to the axis of the expansion member.
An expansion fastening joint assembly according to any one of claims 6 to 8, wherein a single said wedge-shaped abutment has a shape of a pointed shape or a trapezoidal shape or an arc shape on a section passing through the axis.