CN214367159U

CN214367159U - Reamed hole bolt

Info

Publication number: CN214367159U
Application number: CN202120631054.3U
Authority: CN
Inventors: 管彩萍; 陈强
Original assignee: Shanghai Caifu Machinery Co ltd
Current assignee: Shanghai Caifu Machinery Co ltd
Priority date: 2021-03-29
Filing date: 2021-03-29
Publication date: 2021-10-08
Anticipated expiration: 2031-03-29

Abstract

The utility model relates to the technical field of mechanical connection, in particular to a reamed hole bolt, which comprises a screw rod, wherein one end of the screw rod is fixedly connected with a bolt head, and the screw rod sequentially comprises a polished rod section and a thread section along the direction deviating from the bolt head; the polished rod section sequentially comprises a large-diameter section and a small-diameter section along the direction departing from the bolt head, the diameter of the large-diameter section is not smaller than the large diameter of the threaded section, and the diameter of the small-diameter section is not larger than the small diameter of the threaded section; and the part of the thread section, which is far away from the bolt head, is provided with a binding hole which penetrates along the axial direction of the vertical thread section. The utility model provides a ream hole bolt occupation space is little, and whole weight is little, long service life.

Description

Reamed hole bolt

Technical Field

The utility model belongs to the technical field of the mechanical connection technique and specifically relates to a reamed hole bolt is related to.

Background

The common reamed hole bolt in the prior art of rail transit technology is characterized in that a bolt head is generally arranged to be an outer hexagonal t head, a bolt rod is fixedly connected to the lower surface of the bolt head, and the bolt rod sequentially comprises a first polished rod section, a threaded section and a second polished rod section provided with a binding hole along the direction far away from the bolt head.

The binding hole is arranged on the second polished rod section at the tail part of the thread section, so that the problem of excessive exposed screw rods can be caused, and the occupied space is large; and the heat effect of the rail transit variable speed brake system is considered, and the traditional hinged hole bolt has poor integral heat dissipation performance, so that the service life of the hinged hole bolt is influenced.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a reaming bolt to solve the problem that above-mentioned prior art exists, make the occupation space of reaming bolt little, whole weight is little, long service life.

In order to achieve the above object, the utility model provides a following scheme:

the utility model provides a reamed hole bolt, which comprises a bolt body, wherein the bolt body comprises a screw rod and a bolt head fixedly connected with one end of the screw rod, and the screw rod sequentially comprises a polished rod section and a thread section along the direction deviating from the bolt head; the polished rod section sequentially comprises a large-diameter section and a small-diameter section along the direction departing from the bolt head, the diameter of the large-diameter section is not smaller than the large diameter of the threaded section, and the diameter of the small-diameter section is not larger than the small diameter of the threaded section; and the part of the thread section, which deviates from the bolt head, is provided with a binding hole, and the binding hole penetrates through the thread section along the direction vertical to the axial direction of the thread section.

Preferably, an arc-shaped groove is machined at the joint of the large-diameter section and the bolt head.

Preferably, a first arc-shaped chamfer is processed at the joint of the end face of the small-diameter section and the end face of the large-diameter section, and a second arc-shaped chamfer is processed at the joint of the end face of the small-diameter section and the end face of the thread section.

Preferably, the distance between the axis line of the binding hole and the end face of the threaded section, which faces away from the bolt head, is not more than 10 mm.

Preferably, the perpendicularity tolerance between the shaft axis of the large-diameter section and the support end surface of the bolt head close to the screw is not more than 0.05 mm; and the coaxiality tolerance of the shaft axis of the thread section and the shaft axis of the polished rod section is not more than 0.1 mm.

Preferably, the surface roughness of the bolt head near the supporting end face of the screw is processed to not more than rz1.6; the surface roughness of the circumferential surface of the large-diameter section is processed to not more than Rz0.8.

Preferably, the friction coefficient of the bolt head close to the support end face of the screw and the thread surface of the thread section is processed to be within 0.09-0.14.

Preferably, the cross section of the bolt head is provided in a waist shape.

Preferably, the material of the bolt body is medium carbon 35CrMoA steel or medium carbon 42CrMoA steel.

Preferably, the outer surface of the bolt body is coated with an environmentally friendly zinc sheet.

The utility model discloses for prior art gain following technological effect:

the utility model provides a reamed hole bolt, including the bolt body, the bolt body includes screw rod and the bolt head with screw rod one end fixed connection, wherein the screw rod includes polished rod section and screw thread section along the direction that deviates from the bolt head in proper order, and the polished rod section includes thick footpath section and thin footpath section along the direction that deviates from the bolt head in proper order, and wherein thick footpath section diameter is not less than the big footpath of screw thread section, and after the screw thread section passed the mounting hole by the mounting, the mounting hole and thick footpath section interference fit can produce the effect of location; the diameter of the small-diameter section is not larger than the small diameter of the threaded section, so that the overall weight of the reamed hole bolt can be reduced, and meanwhile, after the mounting hole of the fixed part is matched with the large-diameter section, a gap exists between the outer wall of the small-diameter section and the inner wall of the mounting hole, so that the heat dissipation effect can be achieved, and the service life loss of the bolt caused by heating is reduced; and the part of the thread section deviating from the bolt head is provided with a binding hole which penetrates along the vertical self axial direction, the thread section is matched with the slotted nut, then the binding piece penetrates through the binding hole to further fix the bolt and the nut, so that a polished rod section which is provided with the binding hole and has a certain length does not need to be arranged at the tail part of the thread section, and the bolt length is reduced so as to reduce the space occupied by the bolt.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is a front view of one orientation of a reamed hole bolt provided in accordance with one embodiment;

FIG. 2 is a front view of another orientation of a reamed hole bolt provided in accordance with one embodiment;

FIG. 3 is a left side view of the reamed hole bolt of FIG. 2;

FIG. 4 is an enlarged view of a portion of FIG. 2 at A;

FIG. 5 is an axial view of an orientation of a reamed hole bolt provided in accordance with an exemplary embodiment;

FIG. 6 is an axial view of another orientation of the reamed bore bolt provided in accordance with one embodiment.

Icon: 1-reaming a hole bolt; 11-a screw; 111-a polished rod segment; 1111-a coarse diameter section; 1112-a fine diameter section; 112-a threaded segment; 12-bolt head; 13-binding holes; 14-an arc-shaped groove; 15-first arc chamfer; 16-second rounded chamfer.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

The utility model aims at providing a reamed hole bolt to solve the problem that prior art exists, make reamed hole bolt occupation space few, long service life.

In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention is described in detail with reference to the accompanying drawings and the detailed description.

Example one

Referring to fig. 1 to 6, the embodiment provides a reamed hole bolt 1, which includes a bolt body, where the bolt body includes a screw rod 11 and a bolt head 12 fixedly connected to one end of the screw rod 11, where the screw rod 11 includes a polished rod section 111 and a threaded section 112 in sequence along a direction departing from the bolt head 12, the polished rod section 111 includes a large diameter section 1111 and a small diameter section 1112 in sequence along a direction departing from the bolt head 12, where the diameter of the large diameter section 1111 is not less than the large diameter of the threaded section 112, and after the threaded section 112 passes through a mounting hole of a fixed member, the mounting hole is in interference fit with the large diameter section 1111, so as to generate a positioning effect; the diameter of the small-diameter section 1112 is not larger than the small diameter of the thread section 112, so that the overall weight of the reamed hole bolt 1 can be reduced, and meanwhile, after the mounting hole of the fixed part is matched with the large-diameter section 1111, a gap exists between the outer wall of the small-diameter section 1112 and the inner wall of the mounting hole, so that a heat dissipation effect can be achieved, and the service life loss of the bolt caused by heating is reduced; moreover, the part of the thread section 112, which is far away from the bolt head 12, is provided with a binding hole 13 which penetrates through the thread section 112 along the axial direction of the bolt, the thread section 112 is matched with the slotted nut, and then the binding piece penetrates through the binding hole 13 to further fix the matching of the bolt and the slotted nut, so that the risk that the interference of the structure of the traditional reamed hole bolt 1, in which the binding hole 13 is designed on a convex cylinder at the tail part of the thread, is caused to the assembly position is avoided; the length of the screw 11 is reduced, so that the space occupied by the bolt is reduced.

Further, the lashing hole 13 may be disposed to penetrate through the shaft axis in the radial direction of the threaded section 112.

Furthermore, the diameter of the large diameter section 1111 may be 10% larger than the diameter of the threaded section 112, and the diameter of the small diameter section 1112 may be the same as or 5% smaller than the diameter of the threaded section 112; in the actual production process, the diameters of the large-diameter section 1111 and the small-diameter section 1112 can be specifically determined according to actual conditions.

In an alternative of this embodiment, please refer to fig. 1, fig. 2 and fig. 4, preferably, an arc-shaped slot 14 is processed at the joint of the large-diameter section 1111 and the bolt head 12; wherein, the arc wall 14 sets up along the circumference of junction, through setting up arc wall 14 after, when carrying out abrasive machining to rough diameter section 1111 polished rod, the cutter is convenient for process the part that rough diameter section 1111 is close to bolt head 12, make the outer peripheral face of rough diameter section 1111 all process, the cutter moves back from one side that arc wall 14 and bolt head 12 meet, make bolt head 12 and the support terminal surface that is close to rough diameter section 1111 grind in order to reach the technological requirement, and be provided with behind the arc wall 14, bolt head 12 is close to the holding surface of screw rod 11 can with the surface in close contact with by the mounting, further promote the vice stability of connecting.

Specifically, the size of the arc radius of the arc-shaped groove 14 and the size of the slot of the arc-shaped groove 14 indicated at a in fig. 4 can be determined according to practical situations, for example, the reamed hole bolt 1 of M20 specification, the size of the arc radius can be set to 1.5mm, and the size of the slot indicated at a can be set to 3 mm.

In the alternative of this embodiment, preferably, referring to fig. 1 and fig. 2, a first circular arc chamfer 15 is processed at the joint of the end surface of the small diameter section 1112 and the end surface of the large diameter section 1111, and a second circular arc chamfer 16 is processed at the joint of the end surface of the small diameter section 1112 and the end surface of the threaded section 112; by machining the first circular arc chamfer 15 and the second circular arc chamfer 16, the structural stress and the cold-hot machining stress of the reamed hole bolt 1 can be reduced.

Specifically, the arc radius of the first circular arc chamfer 15 and the arc radius of the second circular arc chamfer 16 are determined according to actual conditions, for example, the arc radius of the first circular arc chamfer 15 can be set to 5.5mm and the arc radius of the second circular arc chamfer 16 can be set to 3.5mm in the reamed hole bolt 1 of M20 specification.

Further, the one end that rough diameter section 1111 is connected with first circular arc chamfer 15 is provided with the inclination chamfer, and the inclination of inclination chamfer can be processed according to actual conditions, easy to assemble.

In the alternative of this embodiment, it is preferable that the distance from the axis of the binding hole 13 to the end surface of the threaded section 112 away from the bolt head 12 is not more than 10mm, so as to prevent the slotted nut from covering the binding hole 13, and enable the threaded section 112 and the slotted nut to be firmly bound.

In the alternative of this embodiment, it is preferable that the perpendicularity tolerance between the axis line of the large diameter section 1111 and the support surface of the bolt head 12 close to the screw 11 is processed to be not more than 0.05 mm; the coaxiality tolerance of the shaft axis of the threaded section 112 and the shaft axis of the polished rod section 111 is processed to be not more than 0.1 mm; the surface roughness of the bolt head 12 close to the supporting surface of the screw 11 is processed to be not more than Rz1.6; the surface roughness of the circumferential surface of the coarse diameter section 1111 is processed to not more than rz0.8; the friction coefficient of the bolt head 12 close to the support surface of the screw rod 11 and the thread surface of the thread section 112 is processed to be within 0.09-0.14; so set up and to make the reamed hole bolt 1 connect vice have good installation pretightning force and labour fastening power, make reamed hole bolt 1 in the service environment work of frequent vibration and shearing, difficult pine takes off.

Further, the surface roughness of the remaining surface may be set to rz 3.2.

In an alternative of this embodiment, preferably, referring to fig. 3, 5 and 6, the cross-sectional shape of the bolt head 12 may be a waist shape; the installation clamping position can be avoided, and the weight of the bolt body can be reduced; the shape of the bolt head 12 can be determined according to the actual situation of the installation environment.

In the alternative of this embodiment, preferably, in consideration of the instant high temperature phenomenon of 350-400 ℃ occurring in the speed change system in the field of rail transit, and considering the impact toughness of the bolt at the high temperature of 400 ℃ and at the temperature of-50 ℃, in this embodiment, the medium carbon 35CrMoA alloy steel is selected for the reamed hole bolt 1 of M20 and below, and the medium carbon 42CrMoA alloy steel is selected for the reamed hole bolt 1 of M24 and above; the reamed hole bolt 1 has comprehensive mechanical properties of vibration resistance, impact resistance, shear fracture resistance, extreme cold resistance and the like, and the strength grade reaches 9.8 grade.

In the alternative of this embodiment, it is preferable that, in consideration of the self-lubricating, corrosion-resistant, and moisture-proof properties of the reamed hole bolt 1 in severe environments such as high temperature, humidity, acid mist, and ultraviolet, the outer surface of the reamed hole bolt 1 is coated with an environment-friendly zinc sheet to enhance the corrosion-resistant properties of the reamed hole bolt 1, and to prolong the service life.

The utility model discloses a concrete example is applied to explain the principle and the implementation mode of the utility model, and the explanation of the above example is only used to help understand the method and the core idea of the utility model; meanwhile, for the general technical personnel in the field, according to the idea of the present invention, there are changes in the concrete implementation and the application scope. In summary, the content of the present specification should not be construed as a limitation of the present invention.

Claims

1. The utility model provides a reamed hole bolt, includes the bolt body, its characterized in that: the bolt body comprises a screw rod (11) and a bolt head (12) fixedly connected with one end of the screw rod (11); the screw rod (11) sequentially comprises a polished rod section (111) and a threaded section (112) along the direction departing from the bolt head (12); the polished rod segment (111) sequentially comprises a large-diameter segment (1111) and a small-diameter segment (1112) in the direction facing away from the bolt head (12), the diameter of the large-diameter segment (1111) is not smaller than the large diameter of the threaded segment (112), and the diameter of the small-diameter segment (1112) is not larger than the small diameter of the threaded segment (112); the part of the threaded section (112) departing from the bolt head (12) is provided with a binding hole (13), and the binding hole (13) penetrates through the threaded section (112) along the direction perpendicular to the axial direction of the threaded section (112).

2. The reamed bore bolt of claim 1, wherein: an arc-shaped groove (14) is processed at the joint of the large-diameter section (1111) and the bolt head (12).

3. The reamed bore bolt of claim 1, wherein: the connecting part of the end surface of the small-diameter section (1112) and the end surface of the large-diameter section (1111) is provided with a first circular arc chamfer (15), and the connecting part of the end surface of the small-diameter section (1112) and the end surface of the thread section (112) is provided with a second circular arc chamfer (16).

4. The reamed bore bolt of claim 1, wherein: the distance between the axial lead of the binding hole (13) and the end face of the threaded section (112) departing from the bolt head (12) is not more than 10 mm.

5. The reamed bore bolt of claim 1, wherein: the perpendicularity tolerance between the axial lead of the large-diameter section (1111) and the support end face of the bolt head (12) close to the screw rod (11) is not more than 0.05 mm; the coaxiality tolerance of the shaft axis of the threaded section (112) and the shaft axis of the polished rod section (111) is not more than 0.1 mm.

6. The reamed bore bolt of claim 1, wherein: the surface roughness of the bolt head (12) close to the supporting end surface of the screw rod (11) is processed to be not more than Rz1.6; the surface roughness of the circumferential surface of the coarse diameter section (1111) is processed to not more than rz0.8.

7. The reamed bore bolt of claim 1, wherein: and the friction coefficient of the bolt head (12) close to the support end surface of the screw rod (11) and the thread surface of the thread section (112) is processed to be within 0.09-0.14.

8. The reamed bore bolt of claim 1, wherein: the cross section of the bolt head (12) is arranged to be waist-shaped.

9. A reamed bore bolt as defined in any one of claims 1 to 8, wherein: the bolt body is made of medium carbon 35CrMoA steel or medium carbon 42CrMoA steel.

10. A reamed bore bolt as defined in any one of claims 1 to 8, wherein: the outer surface of the bolt body is coated with an environment-friendly zinc sheet.