CN111677742A - Hydraulic expansion locking bolt - Google Patents
Hydraulic expansion locking bolt Download PDFInfo
- Publication number
- CN111677742A CN111677742A CN202010563813.7A CN202010563813A CN111677742A CN 111677742 A CN111677742 A CN 111677742A CN 202010563813 A CN202010563813 A CN 202010563813A CN 111677742 A CN111677742 A CN 111677742A
- Authority
- CN
- China
- Prior art keywords
- bolt
- expansion
- oil cavity
- oil
- flange
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 229920000459 Nitrile rubber Polymers 0.000 claims description 5
- 230000006835 compression Effects 0.000 abstract description 13
- 238000007906 compression Methods 0.000 abstract description 13
- 230000002708 enhancing effect Effects 0.000 abstract 1
- 239000003921 oil Substances 0.000 description 58
- 239000010720 hydraulic oil Substances 0.000 description 19
- 230000008878 coupling Effects 0.000 description 5
- 238000010168 coupling process Methods 0.000 description 5
- 238000005859 coupling reaction Methods 0.000 description 5
- 230000003068 static effect Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000013016 damping Methods 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 230000035939 shock Effects 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000002929 anti-fatigue Effects 0.000 description 1
- NTXGQCSETZTARF-UHFFFAOYSA-N buta-1,3-diene;prop-2-enenitrile Chemical compound C=CC=C.C=CC#N NTXGQCSETZTARF-UHFFFAOYSA-N 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B39/00—Locking of screws, bolts or nuts
- F16B39/02—Locking of screws, bolts or nuts in which the locking takes place after screwing down
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B35/00—Screw-bolts; Stay-bolts; Screw-threaded studs; Screws; Set screws
- F16B35/04—Screw-bolts; Stay-bolts; Screw-threaded studs; Screws; Set screws with specially-shaped head or shaft in order to fix the bolt on or in an object
- F16B35/041—Specially-shaped shafts
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
- F16F15/02—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems
- F16F15/023—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems using fluid means
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Aviation & Aerospace Engineering (AREA)
- Fluid-Damping Devices (AREA)
Abstract
The invention discloses a hydraulic expansion locking bolt which comprises a head part, a flange, a rod part and a thread part, wherein an annular expansion oil cavity I is formed in the middle part of the flange, the thread part is formed in the outer wall of the middle part of the rod part, an annular expansion oil cavity II is formed in the inner part of the bottom end of the rod part, a main oil cavity is formed along the axis of the bolt, the main oil cavity is communicated with the expansion oil cavity I through an oil through hole I, and the main oil cavity is communicated with the expansion oil cavity II through an oil through hole II; the bolt head is provided with a piston rod, and the end part of the piston rod is provided with a compression screw. According to the hydraulic expansion locking bolt, the expansion oil cavity is designed in the bolt to compensate the pretightening force, so that the aims of enhancing the connection strength of the bolt, reducing vibration and preventing looseness are fulfilled.
Description
Technical Field
The invention relates to the technical field of fasteners, in particular to a hydraulic expansion locking bolt which adopts a static pressure expansion technology to adjust reversal torque, absorb shock and prevent looseness.
Background
The bolt is a most commonly used fastener, mainly playing the role of connection and fastening, the existing bolt is generally composed of a head part and a threaded rod part, and the function principle is to use a plurality of parts which mutually form a thread pair to form a mechanical static connection mode so as to fix the relative position or posture between connected parts and ensure that the connected parts do not move relatively. Under the condition that the static load and the working temperature are not changed greatly, the thread coupling generally cannot be loosened automatically due to the self-locking condition and the anti-loosening effect of the friction force, but the friction force between the screw pairs can be reduced or instantly disappears under the action of impact, vibration or variable load, so that the thread coupling is loosened; in particular, at high temperatures or with large temperature changes, the pre-tightening and frictional forces in the coupling are gradually reduced due to creep and stress relaxation of the materials of the threaded coupling part and the coupled part, which eventually leads to failure of the coupling.
Disclosure of Invention
In order to solve the problems of the existing bolt, the invention aims to provide a hydraulic expansion locking bolt with a brand-new structure.
In order to achieve the purpose, the invention adopts the following technical scheme:
a hydraulic expansion locking bolt comprises a head, a flange, a rod part and a thread part, and is characterized in that the middle of the flange is provided with a first annular expansion oil cavity, the outer wall of the middle of the rod part is provided with the thread part, and the inside of the bottom end of the rod part is provided with a second annular expansion oil cavity; a main oil cavity is formed along the axis of the bolt, the main oil cavity is communicated with the first expansion oil cavity through a first oil through hole, and the main oil cavity is communicated with the second expansion oil cavity through a second oil through hole; the bolt head is provided with a piston rod, and the end part of the piston rod is provided with a compression screw.
Further, the piston rod and the compression screw are located in the head of the bolt, and the compression screw is flush with the end face of the head of the bolt after being screwed down.
Further, the compression screw is a socket head cap screw.
Furthermore, the butadiene-acrylonitrile rubber is installed on the outer side of the piston rod, so that the sealing effect is better.
Furthermore, the main oil cavity is located in the center of the bolt, and the length of the main oil cavity is set according to the length of the bolt so as to ensure that oil passages are communicated.
Furthermore, the expansion oil cavity I takes the center line of the flange as the center and is adjacent to the end face of the flange, and the end face of the flange can expand outwards after hydraulic oil is input and pressurized, so that the pressure between the end face of the flange and the surface of a workpiece is increased, the friction resistance is increased, and the purpose of preventing looseness is achieved.
Furthermore, the second expansion oil cavity is centered on the axis of the bolt and located at the bottom end of the rod portion, the height of the second expansion oil cavity is set according to the length of the bottom end of the rod portion, and the bottom end of the rod portion can be expanded outwards after hydraulic oil is input for pressurization, so that the purpose of tightening torque is achieved.
The invention belongs to a bolt with a brand-new structure, and aims to change the bolt tightening torque, prevent loosening and absorb shock by adopting a static pressure expansion technical design. Compared with the prior art, the invention has the advantages that:
1. innovations are made from the bolt structure, no thread is arranged at the bottom end of the rod part, oil cavities are added in the bottom end of the rod part without the thread and the end surface of the flange, and the pressure of the oil cavities can be adjusted through a pressurizing screw in the center of the head part of the bolt, so that the end surface of the flange and the bottom end of the rod part expand, the pressure of a contact surface is improved, and a gap between the contact surfaces is compensated; meanwhile, the friction resistance between the bottom end of the rod part and a contact surface of the threaded hole, between the end face of the flange and the contact surface is enhanced, the pre-tightening force is improved, and the anti-loosening torque of the bolt is improved.
2. The expansion of the flange and the bottom end of the rod part increases the axial tension of the bolt, so that the pre-tightening capacity of the bolt is improved.
3. The design of inside oil pocket to and the inside hydraulic oil of inputing of oil pocket, changed the structural damping of bolt, under the environment of vibration operating mode, the vibration frequency of bolt changes, has reduced the vibration range of bolt, has strengthened the shock-absorbing capacity of bolt, thereby prevents that the bolt from loosening, has still improved the antifatigue ability and the locking ability of bolt simultaneously by a wide margin.
4. The influence of temperature change on the anti-loosening capacity of the bolt is reduced, and when the environmental temperature is increased, the hydraulic oil in the internal oil cavity is expanded, so that the flange surface and the bottom end of the rod part are expanded, and the pre-tightening force of the bolt is increased; when the ambient temperature reduces, hydraulic oil is littleer compared with the shrink power of iron bolt, can maintain the balance of contact surface, makes can not produce between the contact surface and becomes flexible.
Drawings
FIG. 1 is a schematic structural view (cross-sectional view) of the present invention;
FIG. 2 is a view showing the structure of a pressurizing piston;
fig. 3 is a schematic diagram of the operation of the bolt.
In the figure: head 1, flange 2, shank 5 and threaded portion 6 in the figures: 1. the expansion oil cavity comprises a head part, 2, a flange, 3, expansion oil cavities I and 4, oil through holes I and 5, a rod part, 6, a threaded part, 7, expansion oil cavities II and 8, oil through holes II and 9, a main oil cavity, 10, a piston rod, 11, a compression screw, 12 and nitrile rubber.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
As shown in fig. 1 and 2, the hydraulic expansion locking bolt of the invention comprises a head part 1, a flange 2, an expansion oil cavity I3, an oil through hole I4, a rod part 5, a threaded part 6, an expansion oil cavity II 7, an oil through hole II 8, a main oil cavity 9, a piston rod 10, a compression screw 11 and nitrile rubber 12.
As shown in fig. 1, an annular expansion oil cavity I3 is formed in the middle of a flange 2, a threaded portion 6 is formed in the outer wall of the middle of a rod portion 5, and an annular expansion oil cavity II 7 is formed in the inner portion of the bottom end of the rod portion 5; a main oil cavity 9 is formed in the axis of the bolt, the main oil cavity 9 is located in the center of the bolt, and the length of the main oil cavity 9 is set according to the length of the bolt so as to ensure that oil ways are communicated. The main oil cavity 9 is communicated with the first expansion oil cavity 3 through an oil through hole I4, and the main oil cavity 9 is communicated with the second expansion oil cavity 7 through an oil through hole II 8; the bolt head 1 is provided with a piston rod 10, and the end of the piston rod 10 is provided with a compression screw 11.
The expansion oil cavity I3 is centered on the center line of the flange 2 and adjacent to the end face of the flange 2, and the end face of the flange 2 can expand outwards after hydraulic oil is input and pressurized, so that the pressure between the end face of the flange 2 and the surface of a workpiece is increased, the friction resistance is increased, and the purpose of preventing looseness is achieved. The second expansion oil cavity 7 is centered on the axis of the bolt and located at the bottom end of the rod portion 5, the height of the second expansion oil cavity 7 is set according to the length of the bottom end of the rod portion 5, and the bottom end of the rod portion 5 can be expanded outwards after hydraulic oil is input and pressurized, so that the purpose of tightening torque is achieved.
As shown in fig. 1 and 2, the piston rod 10 and the compression screw 11 are located in the head 1 of the bolt, the compression screw 11 is a socket head cap screw, and the compression screw 11 is flush with the end surface of the bolt head 1 after being tightened. The nitrile rubber 12 is arranged on the outer side of the piston rod 10, so that the sealing effect is better.
The working principle is as follows: firstly, hydraulic oil is filled in a main oil cavity 9, enters an expansion oil cavity I3 through the main oil cavity 9 and an oil through hole I4, and then is filled in the expansion oil cavity I3; meanwhile, the hydraulic oil enters the second expansion oil cavity 7 through the main oil cavity 9 and the second oil through hole 8, and then the second expansion oil cavity 7 is filled with the hydraulic oil. When the bolt is used, the threaded portion 6 of the bolt is screwed into a threaded hole of a required connecting piece, after the bolt is preliminarily pre-tightened, the piston rod 10 is pushed to advance through the compression screw 11 on the head portion 1 of the adjusting bolt through the compression screw 11, so that the volume of hydraulic oil in the oil cavity is compressed, the hydraulic oil transmits the pressure to the end face of the flange 2 and the expansion wall of the expansion oil cavity 7, and the end face of the flange 2 and the expansion oil cavity 7 expand after receiving the pressure transmitted by the hydraulic oil, as shown in fig. 3, so that the friction force is increased, and the pre-tightening force and.
When the external environment vibrates, the structural damping of the whole bolt is changed due to the existence of the hydraulic oil cavity, hydraulic oil can absorb vibration, the pre-applied pretightening force is prevented from being reduced or instantly disappeared, and therefore the bolt cannot loosen and plays a role in preventing looseness. In addition, the pressure screw 11 can be adjusted according to the vibration condition, the pretightening force is increased, and the purpose of preventing the bolt from loosening can be achieved without disassembling the bolt.
When the external temperature rises, the hydraulic oil can expand in volume along with the rise of the temperature, so that the friction force between the expansion wall and the wall of the threaded hole is not reduced, and the purpose of loosening prevention and fastening is achieved; when the ambient temperature reduces, the volume change of hydraulic oil is littleer than the steel, and the range of reducing of screw hole just is bigger than the bolt like this, has increased the pretightning force, and when ambient temperature reduced to the freezing point of hydraulic oil below, the hydraulic oil solidification, the volume can further increase, and the pretightning force can further increase, has also reached locking purpose.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive.
Claims (7)
1. A hydraulic expansion locking bolt comprises a head (1), a flange (2), a rod part (5) and a thread part (6), and is characterized in that a first annular expansion oil cavity (3) is formed in the middle of the flange (2), the thread part (6) is arranged on the outer wall of the middle of the rod part (5), and a second annular expansion oil cavity (7) is formed in the bottom end of the rod part (5); a main oil cavity (9) is formed along the axis of the bolt, the main oil cavity (9) is communicated with the first expansion oil cavity (3) through an oil through hole I (4), and the main oil cavity (9) is communicated with the second expansion oil cavity (7) through an oil through hole II (8); the bolt head (1) is provided with a piston rod (10), and the end part of the piston rod (10) is provided with a pressurizing screw (11).
2. A hydraulic expansion locking bolt according to claim 1, characterised in that the piston rod (10) and the forcing screw (11) are located in the head (1) of the bolt, the forcing screw (11) being tightened flush with the end face of the bolt head (1).
3. A hydraulic expansion locking bolt according to claim 2, characterized in that the forcing screw (11) is a socket head cap screw.
4. A hydraulic expansion lock bolt according to claim 1 or 2, characterized in that the outside of the piston rod (10) is fitted with nitrile rubber (12).
5. A hydraulic expansion lock bolt according to claim 4, characterized in that the main oil chamber (9) is located in the center of the bolt, the length of the main oil chamber (9) being set in accordance with the bolt length.
6. A hydraulic expansion lock bolt according to claim 4, characterized in that the expansion oil chamber one (3) is centered on the centre line of the flange (2) and adjacent to the end face of the flange (2).
7. A hydraulic expansion lock bolt according to claim 4, characterized in that the second expansion chamber (7) is centered on the bolt axis and located at the bottom end of the rod part (5), the height of the second expansion chamber (7) being set in accordance with the length of the bottom end of the rod part (5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010563813.7A CN111677742A (en) | 2020-06-19 | 2020-06-19 | Hydraulic expansion locking bolt |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010563813.7A CN111677742A (en) | 2020-06-19 | 2020-06-19 | Hydraulic expansion locking bolt |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111677742A true CN111677742A (en) | 2020-09-18 |
Family
ID=72455794
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010563813.7A Pending CN111677742A (en) | 2020-06-19 | 2020-06-19 | Hydraulic expansion locking bolt |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111677742A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3660530B2 (en) * | 1998-12-14 | 2005-06-15 | 日立建機株式会社 | Bearing device |
| CN201372998Y (en) * | 2009-02-18 | 2009-12-30 | 宁波凯荣船用机械有限公司 | Hydraulic nut |
| CN104033468A (en) * | 2014-06-19 | 2014-09-10 | 宁波浩渤工贸有限公司 | Anti-dropping bolt |
| EP3015717A1 (en) * | 2014-10-31 | 2016-05-04 | HAWE Hydraulik SE | Threaded washer for a valve |
| CN205533666U (en) * | 2016-02-05 | 2016-08-31 | 无锡申穗船舶设备有限责任公司 | Hydraulic pressure close -fitting bolted construction |
| CN209228833U (en) * | 2018-08-20 | 2019-08-09 | 南通高盛机械制造有限公司 | A kind of fluid power fitting-up bolt |
-
2020
- 2020-06-19 CN CN202010563813.7A patent/CN111677742A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3660530B2 (en) * | 1998-12-14 | 2005-06-15 | 日立建機株式会社 | Bearing device |
| CN201372998Y (en) * | 2009-02-18 | 2009-12-30 | 宁波凯荣船用机械有限公司 | Hydraulic nut |
| CN104033468A (en) * | 2014-06-19 | 2014-09-10 | 宁波浩渤工贸有限公司 | Anti-dropping bolt |
| EP3015717A1 (en) * | 2014-10-31 | 2016-05-04 | HAWE Hydraulik SE | Threaded washer for a valve |
| CN205533666U (en) * | 2016-02-05 | 2016-08-31 | 无锡申穗船舶设备有限责任公司 | Hydraulic pressure close -fitting bolted construction |
| CN209228833U (en) * | 2018-08-20 | 2019-08-09 | 南通高盛机械制造有限公司 | A kind of fluid power fitting-up bolt |
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| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
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| RJ01 | Rejection of invention patent application after publication | ||
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Application publication date: 20200918 |