CN114135559B - Bolt connection structure and method for engine - Google Patents
Bolt connection structure and method for engine Download PDFInfo
- Publication number
- CN114135559B CN114135559B CN202111293463.8A CN202111293463A CN114135559B CN 114135559 B CN114135559 B CN 114135559B CN 202111293463 A CN202111293463 A CN 202111293463A CN 114135559 B CN114135559 B CN 114135559B
- Authority
- CN
- China
- Prior art keywords
- bolt
- engine
- delta
- gasket
- thickness
- 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.)
- Active
Links
- 238000000034 method Methods 0.000 title claims abstract description 12
- 238000009434 installation Methods 0.000 claims abstract description 7
- 125000006850 spacer group Chemical group 0.000 claims description 6
- 230000009286 beneficial effect Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 230000002860 competitive effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
Images
Classifications
-
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B77/00—Component parts, details or accessories, not otherwise provided for
-
- 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
- F16B43/00—Washers or equivalent devices; Other devices for supporting bolt-heads or nuts
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Gasket Seals (AREA)
Abstract
The utility model provides a bolted connection structure and connection method for engine, it includes base, bolt and gasket, is equipped with a plurality of bolt holes that are the row setting on the base, and at least one side of bolt hole is equipped with engine parts installation department, and the bolt head is the polygon, and the bolt passes the gasket to be connected with the bolt hole, and the thickness of gasket is: delta=delta 0 + -alpha x P/360; wherein, delta is the thickness of the actual gasket, delta 0 For the thickness of the reference pad, delta 0 N×p, P is the pitch of the bolt, n is a constant that varies according to the pitch, α is the minimum angle between the perpendicular to the opposite side of the bolt head and the reference line of the base of the bolt hole when a reference gasket is used; the bolts are connected with the bolt holes in the same positions, and the side edges of the bolts, which are close to the mounting parts of the engine, are parallel to the mounting parts of the engine. When the engine part mounting part is designed, the engine part mounting part can be designed to be closer to the head of the bolt, so that the arrangement space of the engine is compressed, and the size of the engine is reduced.
Description
Technical Field
The invention relates to the technical field of mechanical fixation, in particular to a bolt connection structure and a bolt connection method for an engine.
Background
In the increasingly competitive engine market, the reduction of engine volume and weight is a trend of engine development, and for this reason, various manufacturers are pursuing the reduction of engine volume and weight without changing engine power through continuous research and improvement.
Bolts are widely used in engines, and the initial position of a threaded hole into which the bolt is inserted is found to be random in the production process, so that the distance between the bolt head and the mounting part of an engine part is inconsistent when the bolt is screwed. If the rotation quantity of the bolt can be adjusted, the distance from the bolt head to the mounting part of the engine part is maximized, and the size of the mounting part of the engine part can be improved to be closer to the bolt head under the condition of meeting the requirement of the engine, so that the arrangement space of the engine is compressed, and the size of the engine is reduced.
Disclosure of Invention
The purpose of the invention is that: a bolt connection structure and a bolt connection method for an engine are provided, wherein the size of an engine part mounting part can be reduced by adjusting the rotation angle of a bolt, and the size of the engine is reduced.
In order to achieve the above object, the invention provides a bolt connection structure for an engine, which comprises a base, bolts and gaskets, wherein a plurality of bolt holes are arranged in rows on the base, at least one side of each bolt hole is provided with an engine part installation part, the head of each bolt is polygonal, the bolts penetrate through the gaskets to be connected with the bolt holes, and the thickness of each gasket is as follows: delta=delta 0 ±α×P/360；
Wherein, delta is the thickness of the actual gasket, delta 0 For the thickness of the reference pad, delta 0 N×p, P is the pitch of the bolt, n is a constant that varies according to the pitch, and α is the minimum angle between the vertical line of the head opposite side of the bolt and the datum line of the base of the bolt hole when the datum pad is used;
the positions of the bolts and the bolt holes are the same after the bolts are connected, and the side edges, close to the engine part mounting parts, of the bolts are parallel to the engine part mounting parts.
The embodiment of the invention provides a bolt connection structure for an engine, which has the beneficial effects that:
the present invention is represented by the formula δ=δ 0 The thickness of the corresponding gasket of each bolt is obtained by + -alpha X P/360, and then the bolts are matched with the corresponding gaskets, so that the bolts can be close to the side edges of the engine part installation parts and are parallel to the engine part installation parts after being screwed up, the distance between the bolts and the engine part installation parts is the largest, the bolts can be designed to be closer to the heads of the bolts when the engine part installation parts are designed, the arrangement space of the engine is further compressed, the size of the engine is further reduced, the production cost is reduced for enterprises, and the connecting structure is simple in structure and can be widely applied.
Further, n is 2 or 3. The value of n can influence the thickness of the gasket, the value of n is too small to be easy to produce and process, the value of n is too large to waste materials, and the value of n is most suitable when 2 or 3 is taken.
Further, the bolt is a hexagon bolt. The hexagonal bolt is most widely applied in industry and various in types, and can better meet various requirements of an engine.
Further, the periphery of the head of the bolt is provided with a plurality of annular scale marks which are distributed at equal intervals. The scales are arranged, the scale values of each scale are the same, and the corresponding rotation quantity can be calculated by workers conveniently.
Further, the scale marks are arranged on the upper surface of the gasket. The scale is arranged on the gasket, so that the corresponding rotation amount can be calculated by a worker conveniently, and the rotation amount can be judged by the worker through the scale of the gasket due to the fuzzy caused by abrasion of the scale at the head of the bolt.
A bolting method for an engine comprising the steps of:
selecting a reference gasket, selecting a position, which is parallel to the engine part mounting part, of a side edge of the bolt, which is close to the engine part mounting part, as a reference position, and taking a head opposite vertical line of the bolt at the reference position as a bolt hole base reference line;
the bolt passes through the reference gasket to be connected with the bolt hole, when the head of the bolt is opposite to the edgeWhen the vertical line is positioned on the right side of the datum line of the bolt hole base, the bolt is rotated clockwise by a certain angle alpha until the head opposite side vertical line of the bolt coincides with the datum line of the bolt hole base; at this time, the thickness of the actual gasket is adjusted as follows: delta=delta 0 －α×P/360，
When the head opposite side vertical line of the bolt is positioned at the left side of the datum line of the bolt hole base, the bolt is rotated anticlockwise by a certain angle alpha until the head opposite side vertical line of the bolt coincides with the datum line of the bolt hole base; at this time, the thickness of the actual gasket is adjusted as follows: delta=delta 0 +α×P/360，
And finally, connecting the bolts with the bolt holes through the actual gaskets to ensure that the positions of the bolts and the bolt holes are the same after the bolts are connected, and the side edge, close to the engine part mounting part, of each bolt is parallel to the engine part mounting part.
The embodiment of the invention discloses a bolt connection method for an engine, which has the beneficial effects that: according to the thickness of the actual gasket calculated by adopting a corresponding formula according to the fact that the vertical line of the opposite sides of the bolt is positioned at the left side or the right side of the datum line of the base of the bolt hole and the included angle between the two lines, the side edge of each bolt, which is close to the mounting part of the engine, is parallel to the mounting part of the engine part through the cooperation of the bolt and the corresponding actual gasket, the distance between the side edge of each bolt and the mounting part of the engine part is the largest, and the bolt can be designed to be closer to the head of the bolt when the mounting part of the engine part is designed, so that the arrangement space of the engine is compressed. The connecting method is simple to operate, high in applicability and capable of being widely applied.
Drawings
FIG. 1 is a diagram showing the distance between the bolt and the edge of the mounting part of the engine component in the embodiment of the invention;
FIG. 2 is a hexagon bolt (left) and washer (right) of an embodiment of the present invention;
FIG. 3 is a perspective view of a bolt according to an embodiment of the present invention;
in the figure, 1, a bolt; 11. a bolt head; 12. opposite side vertical lines; 13. scale marks; 2. a base; 3. an engine component mounting portion; 4. a reference line; 5. a gasket.
Detailed Description
The following describes in further detail the embodiments of the present invention with reference to the drawings and examples. The following examples are illustrative of the invention and are not intended to limit the scope of the invention.
In the description of the present invention, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "top," "bottom," "inner," "outer," and the like indicate or are based on the orientation or positional relationship shown in the drawings, merely to facilitate description of the present invention and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention.
As shown in fig. 1 to 3, a bolt connection structure for an engine according to a preferred embodiment of the present invention includes a base 2, bolts 1 and a gasket 5, wherein a plurality of bolt holes are arranged in rows on the base 2, at least one side of each bolt hole is provided with an engine component mounting portion 3, a bolt head 11 is polygonal, the bolts 1 penetrate through the gasket 5 to be connected with the bolt holes, and the thickness of the gasket 5 is as follows: delta=delta 0 ±α×P/360；
Wherein, delta is the thickness of the actual gasket, delta 0 For the thickness of the reference pad, delta 0 N×p, P is the pitch of the bolt 1, n is a constant that varies according to the pitch, α is the minimum angle between the perpendicular 12 to the opposite side of the bolt head 11 and the reference line 4 of the bolt hole base 2 when a reference washer is used;
the positions of the bolts 1 are the same after being connected with the bolt holes, and the side edge of each bolt 1, which is close to the engine part mounting part 3, is parallel to the engine part mounting part 3.
n is 2 or 3. The thickness of the gasket 5 can be influenced by the value of n, the value of n is too small to be easy to produce and process, the value of n is too large to waste materials, and the value of n is most suitable when 2 or 3 is taken.
The bolt 1 is a hexagonal bolt. The hexagonal bolt is most widely applied in industry and various in types, and can better meet various requirements of an engine.
The periphery of the bolt head 11 is provided with a plurality of annular scale marks 13 which are distributed at equal intervals. The scales are arranged, the scale values of the scales are the same, and the corresponding rotation angle can be calculated by workers conveniently.
In this embodiment, each scale value is 5 °, and each time the rotation angle increases by 5 °, a spacer 5 with a corresponding thickness is set, the rotation angle adopts a spacer 5 with a rotation angle corresponding to 5 ° in the interval of (0, 5 °), the rotation angle adopts a spacer 5 with a rotation angle corresponding to 10 ° in the interval of (5, 10 °), the rotation angle adopts a spacer 5 with a rotation angle corresponding to 15 ° in the interval of (10, 15 °), and so on.
As shown in fig. 1 to 3, the working process of the present invention is as follows: the bolt 1 and the reference washer are first screwed into the base 2, and when the bolt 1 is tightened to a set torque,
taking the position of the side edge of the bolt 1, which is close to the engine part mounting part 3, parallel to the engine part mounting part 3 as a reference position, and taking the opposite side vertical line 12 of the head of the bolt 1 at the reference position as a reference line 4 of the base 2 of the hole of the bolt 1;
it is judged that the opposite vertical line 12 of the bolt head 11 is located to the right or left of the reference line 4 of the bolt hole base 2,
when the perpendicular to the opposite side 12 of the bolt head 11 is located to the right of the reference line 4 of the bolt hole base 2, the perpendicular to the opposite side 12 forms an angle a with the reference line 4, by which the formula δ=δ is carried in 0 -C x P/360, calculating the thickness of the actual gasket, screwing the actual gasket fitting bolt 1 of this thickness again until the opposite vertical line 12 of the bolt head 11 coincides with the datum line 4 of the bolt hole seat 2, at which time the actual gasket fitting bolt 1 is rotated clockwise and by a corresponding angle a more than the datum gasket fitting bolt 1;
if the perpendicular to the opposite sides 12 of the bolt head 11 is located on the left side of the reference line 4 of the bolt hole base 2, the angle C between the perpendicular to the opposite sides 12 and the reference line 4 is given by the formula δ=δ 0 +C×P/360, calculate the thickness of the actual gasket, screw up the actual gasket of this thickness again to the opposite side vertical line 12 of the head of the bolt 1 and base 2 datum line 4 of the hole of the bolt 1 in coordination with the bolt 1; the actual shim-fitted bolt 1 is now counter-clockwise and rotated by a corresponding angle C less than the reference shim-fitted bolt 1.
If the apex angle of the bolt head 11 coincides with the reference line 4, the angle between the perpendicular to the edge 12 and the reference line 4 is B, and the thickness of the actual gasket can be calculated by selecting any one of the calculation methods described above in which the perpendicular to the edge 12 is located on the right or left of the reference line 4 of the bolt hole base 2.
In summary, the bolt 1 connecting structure for the engine has the beneficial effects that: the present invention is represented by the formula δ=δ 0 The thickness of the corresponding gasket of each bolt 1 is obtained by + -alpha X P/360, and the bolts 1 are matched with the corresponding gaskets 5, so that the side edge of each bolt 1, which is close to the engine part mounting part 3, is parallel to the engine part mounting part 3 after the bolts 1 are screwed up, the distance between the bolts is the largest, the bolts 1 can be designed to be closer to the head of each bolt 1 when the engine part mounting part 3 is designed, the arrangement space of an engine is further compressed, the size of the engine is further reduced, the production cost is reduced for enterprises, and the connecting structure is simple in structure and can be widely applied.
The foregoing is merely a preferred embodiment of the present invention, and it should be noted that modifications and substitutions can be made by those skilled in the art without departing from the technical principles of the present invention, and these modifications and substitutions should also be considered as being within the scope of the present invention.
Claims (6)
1. A bolt connection structure for engine, it includes base, bolt and gasket, be equipped with a plurality of bolt holes that are the row setting on the base, its characterized in that, at least one side of bolt hole is equipped with engine parts installation department, the boltThe head of the gasket is polygonal, the bolt penetrates through the gasket to be connected with the bolt hole, and the thickness of the gasket is as follows: delta=delta 0 ±α×P/360；
Wherein, delta is the thickness of the actual gasket, delta 0 For the thickness of the reference pad, delta 0 When the head opposite side perpendicular line of the bolt is positioned on the right side of the datum line of the bolt hole base, the thickness of the gasket is as follows: delta=delta 0 -a x P/360, the thickness of the shim being: delta=delta 0 +α×P/360；
The positions of the bolts and the bolt holes are the same after the bolts are connected, and the side edges, close to the engine part mounting parts, of the bolts are parallel to the engine part mounting parts.
2. The bolting structure for engine according to claim 1, wherein n is 2 or 3.
3. The bolting structure for engine according to claim 2, wherein said bolt is a hexagonal bolt.
4. The bolting structure for engine according to claim 2, wherein the outer periphery of the head of the bolt is provided with a plurality of annular scale marks distributed equidistantly.
5. The bolting structure for engine according to claim 4, wherein said graduation marks are provided on an upper surface of said spacer.
6. A bolting method for an engine, which is performed using the bolting structure according to any one of claims 1-5, comprising the steps of:
selecting a reference gasket, selecting a position, which is parallel to the engine part mounting part, of a side edge of the bolt, which is close to the engine part mounting part, as a reference position, and taking a head opposite vertical line of the bolt at the reference position as a bolt hole base reference line;
the bolt penetrates through the reference gasket to be connected with the bolt hole, and when the head opposite side vertical line of the bolt is positioned on the right side of the reference line of the bolt hole base, the bolt is rotated clockwise by a certain angle alpha until the head opposite side vertical line of the bolt is overlapped with the reference line of the bolt hole base; at this time, the thickness of the actual gasket is adjusted as follows: delta=delta 0 －α×P/360，
When the head opposite side vertical line of the bolt is positioned at the left side of the datum line of the bolt hole base, the bolt is rotated anticlockwise by a certain angle alpha until the head opposite side vertical line of the bolt coincides with the datum line of the bolt hole base; at this time, the thickness of the actual gasket is adjusted as follows: delta=delta 0 +α×P/360，
And finally, connecting the bolts with the bolt holes through the actual gaskets to ensure that the positions of the bolts and the bolt holes are the same after the bolts are connected, and the side edge, close to the engine part mounting part, of each bolt is parallel to the engine part mounting part.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111293463.8A CN114135559B (en) | 2021-11-03 | 2021-11-03 | Bolt connection structure and method for engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111293463.8A CN114135559B (en) | 2021-11-03 | 2021-11-03 | Bolt connection structure and method for engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114135559A CN114135559A (en) | 2022-03-04 |
| CN114135559B true CN114135559B (en) | 2023-06-16 |
Family
ID=80392292
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111293463.8A Active CN114135559B (en) | 2021-11-03 | 2021-11-03 | Bolt connection structure and method for engine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114135559B (en) |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012066354A (en) * | 2010-09-24 | 2012-04-05 | Honda Motor Co Ltd | Method for measuring number of washers in consideration of deformation by being tightened |
| JP2013032820A (en) * | 2011-08-02 | 2013-02-14 | Narihiro Hagiwara | Fastening bolt |
| CN203796708U (en) * | 2013-11-28 | 2014-08-27 | 内蒙古欧意德发动机有限公司 | Bolt and bolt connection component |
| CN203926321U (en) * | 2014-05-29 | 2014-11-05 | 陈舒光 | A kind of securing means of the anti-Anti-theft-dismounting that relaxes |
| CN104533918A (en) * | 2014-11-26 | 2015-04-22 | 中国北方发动机研究所(天津) | Bolt assembly |
| CN105508380A (en) * | 2016-01-26 | 2016-04-20 | 上海兆果五金制品有限公司 | Automotive interior and exterior trim connector |
| CN107725563A (en) * | 2017-11-30 | 2018-02-23 | 广西大学行健文理学院 | It is applicable to the stop nut for being rigidly connected and being flexibly connected |
| CN109973496A (en) * | 2019-04-02 | 2019-07-05 | 柳州钢铁股份有限公司 | Bolt retainer and method for locking |
| CN111692004A (en) * | 2020-05-21 | 2020-09-22 | 东风柳州汽车有限公司 | Engine and cylinder body water jacket thereof |
| CN211778448U (en) * | 2020-03-23 | 2020-10-27 | 夏昌明 | Bolt gasket anti-loosening structure and gasket under nut-free condition |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2018003864A (en) * | 2016-06-27 | 2018-01-11 | キヤノン株式会社 | Insert nut and fastening device |
-
2021
- 2021-11-03 CN CN202111293463.8A patent/CN114135559B/en active Active
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012066354A (en) * | 2010-09-24 | 2012-04-05 | Honda Motor Co Ltd | Method for measuring number of washers in consideration of deformation by being tightened |
| JP2013032820A (en) * | 2011-08-02 | 2013-02-14 | Narihiro Hagiwara | Fastening bolt |
| CN203796708U (en) * | 2013-11-28 | 2014-08-27 | 内蒙古欧意德发动机有限公司 | Bolt and bolt connection component |
| CN203926321U (en) * | 2014-05-29 | 2014-11-05 | 陈舒光 | A kind of securing means of the anti-Anti-theft-dismounting that relaxes |
| CN104533918A (en) * | 2014-11-26 | 2015-04-22 | 中国北方发动机研究所(天津) | Bolt assembly |
| CN105508380A (en) * | 2016-01-26 | 2016-04-20 | 上海兆果五金制品有限公司 | Automotive interior and exterior trim connector |
| CN107725563A (en) * | 2017-11-30 | 2018-02-23 | 广西大学行健文理学院 | It is applicable to the stop nut for being rigidly connected and being flexibly connected |
| CN109973496A (en) * | 2019-04-02 | 2019-07-05 | 柳州钢铁股份有限公司 | Bolt retainer and method for locking |
| CN211778448U (en) * | 2020-03-23 | 2020-10-27 | 夏昌明 | Bolt gasket anti-loosening structure and gasket under nut-free condition |
| CN111692004A (en) * | 2020-05-21 | 2020-09-22 | 东风柳州汽车有限公司 | Engine and cylinder body water jacket thereof |
Non-Patent Citations (2)
| Title |
|---|
| Spring-force self-aligned multiball pitch artifact;Masaharu Komori et al.;《Precision Engineering》(第45期);全文 * |
| 计算法调整垫圈厚度;何世志;《机械工人.冷加工》(第3期);全文 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN114135559A (en) | 2022-03-04 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN114135559B (en) | Bolt connection structure and method for engine | |
| CN205800545U (en) | Digital decorating machine shower nozzle vehicle structure and have the digital decorating machine of this shower nozzle dolly | |
| CN204403105U (en) | A kind of lock washer | |
| CN102267061A (en) | Gear ignition hole drilling clamp | |
| EP3511581B1 (en) | Hybrid three-point drive fastener | |
| JP2002295440A (en) | Table system | |
| CN210436034U (en) | Adjustable suspension bracket mounting bolt tightening clamp | |
| CN207848173U (en) | A kind of attachment means | |
| CN209818483U (en) | Hexagon nut and hexagon bolt assembly | |
| CN203516398U (en) | Self-locking bolt | |
| CN216895293U (en) | Fastener for marine environment | |
| CN219366499U (en) | Anti-loosening connecting structure for component connection | |
| CN112032167A (en) | High-strength wear-resistant hexagonal head bolt | |
| CN221120606U (en) | Lock bolt assembly | |
| CN219733891U (en) | Fastener capable of effectively preventing loosening for power engineering | |
| CN218992553U (en) | Mounting bracket of mechanical valve positioner | |
| CN205977923U (en) | T type frid connection structure | |
| CN205858909U (en) | A kind of hexagon ring cross recess tooth of synchronous belt bolt | |
| CN217633366U (en) | Knocking type hexagonal nut | |
| CN216812485U (en) | Anti bolted connection structure that slides in photovoltaic supporting structure | |
| CN214063508U (en) | Screw positioning device convenient for mounting screws | |
| CN213839231U (en) | Bolt easy to rotate and twist | |
| CN205047597U (en) | Adjustable bolted connection structure | |
| CN220980090U (en) | Bolt and tooth hole structure capable of preventing loosening | |
| CN217020159U (en) | Multi-specification sleeve |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |