CN220791823U - Pretension workpiece - Google Patents

Abstract

The application relates to a pre-tightening workpiece, which comprises a main body part and a butt joint boss, wherein the butt joint boss is used for being clamped and matched with a clamping groove of an opponent to transmit torque; the butt joint boss is connected to the end part of the main body part in a transitional manner through at least one cambered surface arc. This application sets up fillet structure in at least one junction of butt joint boss and main part, and then realizes both local smooth transitional coupling or the equal smooth transitional coupling in everywhere, and the quantity of cambered surface and the structural dimension of fillet all can carry out adaptability adjustment according to pretension object, the pretightning force demand of difference. The arc transition connection can effectively avoid butt joint boss and main part lug boss direct connection to form the too concentrated closed angle region of stress, reaches the technical effect that effectively reduces the junction position and leads to the fact the harmful effect to the structure because of stress concentration, effectively guarantees the overall structure intensity of working segment simultaneously.

Description

Pretension workpiece

Technical Field

The application relates to the field of assembly tools, in particular to a pre-tightening workpiece.

Background

At present, the following two methods are generally adopted for the pre-tightening requirement of the threaded connecting piece after connection: 1. rotating by clamping the outer contour surface of the threaded connecting piece; 2. the end part of the threaded connecting piece is provided with the groove, the matched pre-tightening workpiece is clamped in the groove, and the pre-tightening workpiece is rotated to drive the threaded connecting piece to rotate so as to realize torque transmission.

For example, when the pin-penetrating type retainer roller bearing is assembled, the post screw rod in the retainer assembly passes through the upper retainer ring through hole and the roller through hole and then is fastened with the lower retainer ring through threaded connection, and certain pretightening moment is required to be applied to the post screw rod after the assembly in order to ensure the reliability of the assembly. Due to the structural characteristics and insufficient assembly space, the second pre-tightening method can only be selected, and a narrow flat groove is formed in one end face, close to the upper check ring, of the pillar screw rod for being matched with a pre-tightening workpiece to conduct torque. However, the pre-tightening workpiece in the related art has weak structural strength, often breaks, distorts and deforms and the like due to the fact that moment cannot be born in the pre-tightening process, the pre-tightening function cannot be achieved, the service life of the pre-tightening workpiece is short even if the pre-tightening condition is barely achieved, and the pre-tightening of only one post screw rod can be usually disabled.

In summary, the related art has the technical problems that the pre-tightening workpiece has weak structural strength and short service life, and cannot be recycled, and the production cost is high.

Disclosure of Invention

In order to solve the technical problem, the application provides a pre-tightening workpiece, the structural strength of the pre-tightening workpiece is improved by optimizing and improving the self structure of the pre-tightening workpiece, the torque transmission requirement required by pre-tightening can be met, the service life of the workpiece is greatly prolonged, and the production input cost is reduced.

The pretension workpiece provided by the application adopts the following technical scheme:

a pre-tightening workpiece comprises a main body part and a butt joint boss, wherein the butt joint boss is used for being clamped and matched with a clamping groove of a counterpart to transmit torque; the butt joint boss is connected to the end part of the main body part in a transitional manner through at least one cambered surface arc.

In some embodiments, the body portion includes a working section and a variable cross-section; the working section and the butt joint lug boss are respectively connected to two end surfaces of the variable section along the axial direction of the main body part; the cross section size of the variable section is in an increasing trend from the butt joint boss to the direction of the working section.

In some embodiments, the abutment boss is a straight boss, and the extension direction of the abutment boss is perpendicular to the axial direction of the main body portion.

In some embodiments, the body portion is a planar symmetrical structure, and a plane of symmetry of the body portion is coplanar with a central axis of the docking boss in the extension direction.

In some embodiments, the cross section of the working section is a regular polygon with an even number of sides; the central axis of the butt joint boss is perpendicular to two parallel side surfaces of the working section.

In some embodiments, the extension length of the abutment boss has the same value as the diameter of the inscribed circle of the working segment.

In some embodiments, a longitudinal section of the variable cross-section parallel to the axial direction of the main body portion and perpendicular to the symmetry plane is an isosceles trapezoid, and an included angle c between a hypotenuse of the isosceles trapezoid and the axial line of the main body portion is 30 ° to 50 °.

In some embodiments, the butt joint boss is connected to the main body part in a transitional manner through an arc surface with a radius of a central angle of 6 mm-8 mm.

In some embodiments, the abutment boss projects within the axial projection of the variable cross-section in the direction of the axial projection of the main body portion.

In some embodiments, the pre-tensioned workpiece further comprises an operating part in force transmission connection with the main body part for operating the main body part to rotate; and/or; the main body part and the butt joint boss are made of 42CrMo4 material.

According to the technical scheme, the butt joint boss is used for being matched with the opponent piece, so that synchronous torsion of the pre-tightening workpiece and the opponent piece is achieved. Because the butt joint boss bears main torsion, and the joint of the butt joint boss and the main body part is a weak area, the butt joint boss is easy to break due to overlarge torsion, and the like. This application sets up fillet structure in at least one junction of butt joint boss and main part, and then realizes both local smooth transitional coupling or the equal smooth transitional coupling in everywhere, and the quantity of cambered surface and the structural dimension of fillet all can carry out adaptability adjustment according to pretension object, the pretightning force demand of difference. The arc transition connection can effectively avoid butt joint boss and main part lug boss direct connection to form the too concentrated closed angle region of stress, reaches the technical effect that effectively reduces the junction position and leads to the fact the harmful effect to the structure because of stress concentration, effectively guarantees the overall structure intensity of working segment simultaneously.

According to the tool, through structural optimization of the pre-tightening workpiece, effective pre-tightening of the threaded connecting piece with the groove bayonet can be achieved, torque requirements required by pre-tightening are met, and the service life of the tool is greatly prolonged. On the basis of meeting the pre-tightening condition, when the pre-tightening workpiece is applied to the assembly pre-tightening of the pin-penetrating retainer roller bearing, the pre-tightening workpiece can meet the pre-tightening requirement of the whole set of bearing, and only slight abrasion marks exist on the pre-tightening workpiece, the pre-tightening workpiece is not seriously deformed and broken, so that the production cost is effectively controlled.

Drawings

FIG. 1 is an axial projection schematic view of a pretensioned workpiece provided in example 1 of the present application;

FIG. 2 is a schematic A-A cross-sectional view of the pre-tensioned workpiece of FIG. 1.

Reference numerals illustrate: 10-a main body part, 11-a working section and 12-a variable cross-section; 20-butting bosses; 30-cambered surface;

the axial direction of the a-main body part and the extending direction of the b-butt joint lug boss.

Detailed Description

In order to make the present application more clearly understood to those skilled in the art, the present application is further described in detail below with reference to fig. 1-2.

The embodiment of the application discloses a pre-tightening workpiece. Referring to fig. 1-2, the device comprises a main body part 10 and a butt joint boss 20 for being in clamping fit with a clamping groove of a counter part to transmit torque, so that synchronous torsion of a pre-tightening workpiece and the counter part is realized. Because the butt-joint boss 20 receives main torsion, and the joint of the butt-joint boss and the main body part 10 is a weak area, breakage and the like easily occur due to overlarge torsion. In this embodiment, the docking boss 20 is connected to the end of the main body 10 through at least one arc surface 30 in an arc transition manner, that is, a rounded corner structure is disposed at least one connection position between the docking boss 20 and the main body 10, so as to achieve local smooth transition connection or smooth transition connection of the two positions. The arc transition connection can effectively avoid the butt joint boss 20 to be directly connected with the main body part 10 to form a sharp corner area with too concentrated stress, thereby achieving the technical effects of effectively reducing the adverse effect on the structure caused by the concentrated stress at the connection part and effectively ensuring the overall structural strength of the working section 11.

It should be noted that, in the present application, the connection manner of the docking boss 20 and the main body portion 10 includes, but is not limited to, arc transition, and in some embodiments, at least one of a positive arc and an elliptical arc may be used for connection of the docking boss 20 and the main body portion 10; in some embodiments, the connection of the docking boss 20 and the body portion 10 may also take the form of a combination of a circular arc connection and a planar connection. Meanwhile, the number of the cambered surfaces 30 and the structural size of the round corners can be adaptively adjusted according to different pre-tightening objects and pre-tightening force requirements. According to the tool, through structural optimization of the pre-tightening workpiece, effective pre-tightening of the threaded connecting piece with the groove bayonet can be achieved, torque requirements required by pre-tightening are met, and the service life of the tool is greatly prolonged. On the basis of meeting the pre-tightening condition, when the pre-tightening workpiece is applied to the assembly pre-tightening of the pin-penetrating retainer roller bearing, the pre-tightening workpiece can meet the pre-tightening requirement of the whole set of bearing, and only slight abrasion marks exist on the pre-tightening workpiece, the pre-tightening workpiece is not seriously deformed and broken, so that the production cost is effectively controlled.

The specific mode that the butt joint boss 20 is connected to the end part of the main body part 10 is not limited, and the butt joint boss 20 can be arranged on the side surface of the end part of the main body part 10 or on the axial end face a of the main body part 10, so long as the use condition can be met and the butt joint boss 20 and the main body part can be in arc transition connection through at least one cambered surface 30.

As can be appreciated by those skilled in the art, when the docking station 20 has a portion that exceeds the connecting surface of the main body 10 in size, since the exceeding portion is connected to the main body 10 only by the transitional connection section, the main body 10 has limited support to the exceeding portion, so that the exceeding portion has weaker strength than the portion located on the surface of the main body 10, and meanwhile, the force transmitted from the docking station 20 to the main body 10 tends to be conducted, so that the strength distribution of the pre-tightening workpiece is uneven, and the pre-tightening workpiece adopting the structure is more limited in use and has shorter service life.

In order to stably connect the main body 10 and the abutment boss 20 to improve the overall strength, in this embodiment, in the axial projection direction a of the main body 10, the abutment boss 20 is projected in the axial projection of the variable section 12, that is, the abutment boss 20 is projected in the end face of the variable section 12, so that the overall force conduction trend of the rounded corner structure and other transitional connection structures or more than 2 rounded corner structures is kept consistent, and stable connection of the main body 10 on each side face of the abutment boss 20 is ensured.

The number of fillets used in transitional connection is not limited, the number of fillets is related to the pretightening moment requirement of the opponent, the shape of the butting boss 20, the stress action condition of the butting boss 20 in the position of the main body part 10 and in twisting fit, and the like, for example, in some embodiments, the butting boss 20 is in an isosceles triangle shape, then two oblique sides of the isosceles triangle are used as main stress surfaces in torque transmission, and under the condition that the pretightening moment requirement is not large, only two isosceles oblique sides of the butting boss 20 can be designed into a connection scheme in smooth transition with the main body part 10.

Since the circular arc can realize smooth transition connection, the effect of eliminating stress concentration is better than other forms of transition connection, and as a preferred embodiment, each side surface of the butt joint boss 20 with a distance from the side surface of the main body part 10 is in transition connection with the end surface circular arc of the main body part 10.

As shown in fig. 2, in the present embodiment, the main body portion 10 includes a working section 11 and a variable cross-section 12; the working section 11 and the butt-joint boss 20 are respectively connected to both end surfaces of the variable section 12 along the axial direction a of the main body 10; the cross-sectional dimension of the variable cross-section 12 tends to increase from the butt-joint boss 20 to the working section 11, and the torsion is assisted by the variable cross-section 12 to be dispersed, and the self structural strength of the main body 10 is improved. The increasing trend is only one trend, and the variable section 12 may be a two-section structure that increases first and then does not change, or a three-section structure that increases first and then does not change, or the like.

The shape of the abutment boss 20 is not limited in this application. The torque force can be transmitted only after the clamping, such as a cross boss, a semicircular boss, an elliptical boss, a polygonal boss, a special-shaped boss and the like. In some embodiments, the cross-sectional shape of the abutment boss 20 is a regular polygon, at this time, the stress degrees of the sides are substantially consistent during torque transmission, and at this time, a scheme of full-round corner transition connection or combination transition connection of round corners and inclined planes can be selected according to actual requirements and conditions, which is not limited in this application.

In order to facilitate processing and forming and save labor during pre-tightening, as a preferred embodiment, the butt joint boss 20 is a straight boss, and the extending direction b of the butt joint boss 20 is perpendicular to the axial direction a of the main body 10, and when the straight boss transmits torque, two long side surfaces are mainly matched with the groove wall of the opponent, so that at least two long side surfaces can be connected with the main body 10 in an arc transition mode according to factors such as pre-tightening force. In addition, according to the distribution situation of the butt-joint bosses 20 on the main body 10, if the two long side surfaces are unevenly distributed on the variable cross section 12, the radius of the arc can be increased on one side surface with larger stress according to the situation so as to ensure the strength and the anti-breaking performance.

In this embodiment, the position of the abutment boss 20 on the main body 10 is not particularly limited, but it can be known through stress analysis that the more uniform the distribution of each stress surface of the abutment boss 20 on the main body 10, the better the overall structure and overall strength. As a preferred embodiment, in this embodiment, the main body 10 is in a plane symmetrical structure, the symmetry plane of the main body 10 is coplanar with the central axis of the docking boss 20 parallel to the extending direction, that is, the main body 10 is symmetrical, the axis of the main body 10 is in the symmetry plane of the main body 10, and the symmetry plane of the main body 10 is coplanar with the central axis of the docking boss 20 parallel to the axis of the main body 10 in the extending direction b, referring to fig. 1, the symmetry plane of the main body 10 is the plane parallel to the axis a where the extending direction b is located. The straight boss is also symmetrically arranged on the main body part 10, so that the bearing force of the two long side surfaces of the straight boss is uniform, and single-side fracture failure caused by larger stress phase difference of the two sides of the straight boss is avoided.

The overall shape of the working section 11 is not limited in this application, and in some embodiments, the cross-section may be circular, polygonal, irregularly shaped, or the like. In this embodiment, the cross section of the working section 11 is a regular polygon with an even number of sides; the central axis of the abutment boss 20 is perpendicular to the two parallel sides of the working segment 11.

As shown in fig. 1, in this embodiment, the extension length of the abutment boss 20 has the same value as the diameter of the inscribed circle of the working section 11, that is, the two short side surfaces of the straight boss are coplanar with the two side surfaces of the adjacent working section 11.

In order to further enhance the strength of the main body 10 and enhance the torque transmission and torque dispersion capability in the working state, in this embodiment, as shown in fig. 2, the longitudinal section of the variable section 12 parallel to the axial direction a of the main body 10 and perpendicular to the symmetry plane is in the shape of an isosceles trapezoid, and the included angle c between the hypotenuse of the isosceles trapezoid and the axis of the main body 10 is 30 ° to 50 °, so as to form the variable section 12.

The arc radius of the arc transition connection is not particularly limited, and the arc radius can be adaptively adjusted according to specific application conditions. In a preferred embodiment, the arc transition connection is realized by adopting a positive arc, and the butt joint boss 20 is in arc transition connection with the main body part 10 by adopting an arc surface 30 with the radius of a central angle of 6 mm-8 mm. In this embodiment, the two long side surfaces of the straight boss are connected to the main body 10 in a transitional manner by arc surface 30 with radius of central angle of 6.5mm, and the angle c between the isosceles inclined surface of the variable section 12 and the axis of the main body 10 is 45 DEG

In order to facilitate the pre-tightening operation, in this embodiment, the pre-tightening workpiece further includes an operation portion in force-transmitting connection with the main body portion 10 for operating the rotation of the main body portion 10. The structure of the operation portion and the manner of matching with the main body portion 10 are not particularly limited in this application, for example, in some embodiments, the operation portion may be screwed with the working section 11, and the operation portion is disposed at an angle with the working section 11, so as to implement a twisting operation in the form of a structure of a handle. As a preferred embodiment, the operation part may also adopt a sleeving and matching manner with the working section 11, and realize synchronous rotation by using an anti-rotation structure. In this embodiment, the working section 11 is a regular polyhedron, and the operating part is provided with a handle means and a sleeve section matched with the working section 11, and the handle means is fixedly connected with the sleeve section and is arranged at an angle.

In order to facilitate the cooperation of the operation part and the working section 11, preferably, a magnetic attraction piece is arranged at the close end of the cooperation of the working section 11 and the sleeve section or is directly arranged to be of a magnetic structure, so that the pre-tightening workpiece is convenient to assemble, use and store, the loss of the main body part 10 and the operation part is effectively avoided, and the matched use is realized. Meanwhile, if the connection between the butt joint boss 20 and the main body part 10 fails, the failed main body part 10 is convenient to replace.

In addition, in order to realize the predictable judgment of the pre-tightening operation, in the embodiment, the torque sensing detection assembly is further arranged on the operation part and used for measuring the torque, so that the pre-tightening work is efficiently and accurately completed, the assembly effect of parts is ensured, and a series of product performance deviations caused by pre-tightening torque errors are avoided.

In order to ensure the structural strength of the pre-tightening workpiece, in this embodiment, the main body 10 and the butt-joint boss 20 are made of 42CrMo4 material. In addition, the scheme sets a heat treatment process according to the material characteristics: keeping the temperature at 850 ℃ for 30 minutes, quenching oil, tempering at 400 ℃ for 60 minutes. The structure of the pre-tightening workpiece and the heat treatment process for manufacturing the pre-tightening workpiece are optimized, the pre-tightening of the workpiece can be achieved, the service life of the pre-tightening workpiece is greatly prolonged, the pre-tightening workpiece is applied to the whole set of bearing assembly pre-tightening of the pin-penetrating retainer roller bearing on the basis of meeting the pre-tightening condition, the pre-tightening workpiece is not obviously deformed and broken, and only slight abrasion marks exist.

The implementation principle of the pre-tightening workpiece in the embodiment of the application is as follows: the butt joint boss 20 is placed in the clamping groove of the opponent, and torque is transmitted to the opponent by the butt joint boss 20 through directly operating the main body part 10 or rotating the main body part 10 through the operation part, so that synchronous torsion of the pre-tightening workpiece and the opponent is realized. This application sets up fillet structure in at least one junction of butt joint boss 20 and main part 10, and then realizes the equal smooth transitional coupling of local smooth transitional coupling or everywhere of both, and circular arc transitional coupling can effectively avoid butt joint boss 20 and main part 10 lug connection to form the too concentrated closed angle region of stress, reaches the technical effect that effectively reduces the junction department because of stress concentration causes the harmful effects of structure, effectively guarantees the overall structure intensity of work section 11 simultaneously.

The application provides a pretension work piece can realize having effective pretension of recess bayonet socket's threaded connection spare, satisfy the required moment of torsion demand of pretension to the life of frock has been improved greatly. On the basis of meeting the pre-tightening condition, when the pre-tightening workpiece is applied to the assembly pre-tightening of the pin-penetrating retainer roller bearing, the pre-tightening workpiece can meet the pre-tightening requirement of the whole set of bearing, and only slight abrasion marks exist on the pre-tightening workpiece, the pre-tightening workpiece is not seriously deformed and broken, so that the production cost is effectively controlled.

The foregoing are all preferred embodiments of the present application, and are not intended to limit the scope of the present application in any way, therefore: all equivalent changes in structure, shape and principle of this application should be covered in the protection scope of this application.

Claims (10)

1. The pre-tightening workpiece is characterized by comprising a main body part (10) and a butt joint boss (20) which is used for being in clamping fit with a clamping groove of the workpiece to transmit torque; the butt joint boss (20) is connected to the end part of the main body part (10) through at least one arc surface (30) in an arc transition mode.

2. Pretensioned workpiece according to claim 1, characterized in that the body part (10) comprises a working section (11) and a variable cross-section (12); along the axial direction a of the main body part (10), the working section (11) and the butt joint boss (20) are respectively connected to two end surfaces of the variable section (12); the cross-sectional dimension of the variable cross-section (12) tends to increase from the abutment boss (20) to the working section (11).

3. The pretensioned workpiece according to claim 2, characterized in that the abutment boss (20) is a straight boss, and the extension direction b of the abutment boss (20) is perpendicular to the axial direction a of the main body portion (10).

4. A pre-tensioned workpiece according to claim 3, characterized in that the body part (10) is of planar symmetry and the plane of symmetry of the body part (10) is coplanar with the central axis of the abutment boss (20) parallel to the extension direction b.

5. The pre-tensioned workpiece according to claim 4, characterized in that the cross section of the working section (11) is of regular polygon with an even number of sides; the central axis of the butt joint boss (20) is perpendicular to two parallel side surfaces of the working section (11).

6. Pretensioned workpiece according to claim 5, characterized in that the extension of the abutment boss (20) has the same value as the diameter of the inscribed circle of the working section (11).

7. Pretensioned workpiece according to claim 6, characterized in that the longitudinal section of the variable section (12) parallel to the axial direction a of the body part (10) and perpendicular to the plane of symmetry is an isosceles trapezoid, and that the angle c between the hypotenuse of the isosceles trapezoid and the axis of the body part (10) is 30 ° to 50 °.

8. The pre-tightening workpiece according to any one of claims 1-7, characterized in that the abutment boss (20) is connected to the main body part (10) in a circular arc transition with a cambered surface (30) having a radius of 6 mm-8 mm.

9. Pretensioned workpiece according to any of claims 2-7, characterized in that the abutment boss (20) projects within the axial projection of the variable section (12) in the axial a projection direction of the main body part (10).

10. The pretensioned workpiece according to any one of claims 1-7, characterized in that the pretensioned workpiece further comprises an operating part in force-transmitting connection with the main body part (10) for operating the rotation of the main body part (10);

and/or; the main body part (10) and the butt joint boss (20) are made of 42CrMo4 materials.