One-way limiting assembly type bolt for engine

Abstract

The utility model relates to the technical field of fasteners, in particular to a one-way limiting assembly type bolt for an engine, which comprises a screw head, a screw rod, a fixing block and a nut, a screw head cover is arranged at the top of the screw head, the screw head is downwards connected with the screw rod, a limiting ring is arranged above the screw rod, a cavity is arranged below the screw rod, the fixing block is inserted into the lower side of the screw rod, and the nut is arranged in the cavity. And a nut is connected outside the screw rod. According to the one-way limiting assembly type bolt for the engine, the limiting ring arranged on the screw rod and the anti-skid teeth arranged at the bottom of the screw head increase friction force at the connecting position, the bolt is prevented from falling off, and stability and safety of the connecting position are improved; the fixing block is inserted into the bottom of the screw, expansion of the expansion section of the screw is achieved, limiting is achieved, single-side falling of the bolt is prevented, and the bolt can be prevented from being forcibly disassembled by people through the bolt head cover arranged on the bolt head.

Description

Technical Field

[0001] The utility model relates to the technical field of fasteners, and more specifically, to a one-way limit assembled bolt for an engine.

Background Art

[0002] With the rapid development of industry, our demand and requirements for the fastening between workpieces have also increased. As the most commonly used fastener, bolts are indispensable industrial necessities in daily life. Especially in industries such as automobile manufacturing, various components need to be installed together. Bolts can be paired with nuts to complete the fastening work, and bolts can also complete the fastening work alone. For example, one component is provided with a through hole, and the other component is provided with a threaded hole corresponding to the through hole. The bolt passes through the through hole and is screwed into the threaded hole, and the fastening of the two components can be completed.

[0003] An existing one-way screw, with the publication number CN 217328006 U, includes a one-way screw body. The one-way screw body is arranged inside a protective sleeve. A protective pad is installed inside the protective sleeve through an extrusion mechanism. The one-way screw body is arranged inside the protective pad. The one-way screw body includes anti-slip teeth, a connecting piece, and screw teeth. The bottom of the anti-slip teeth is connected with the screw teeth through the connecting piece. The screw teeth extend into the protective sleeve and contact the protective pad. A driving groove is provided, and it can only be disassembled with a professional tool to avoid manual disassembly. However, when this kind of screw is produced and used, due to the need for a professional tool for disassembly, the production time is increased, the production efficiency is reduced, and when the space at the position to be fixed is small, the tool cannot be inserted for fixing.

Content of the Utility Model

[0004] In order to overcome the above-mentioned defects of the prior art, the purpose of the utility model is to provide a one-way limit assembled bolt for an engine, which has a good limit and fixing effect and can avoid being manually disassembled.

[0005] To achieve the above purpose, the utility model provides the following technical solution: A one-way limit assembled bolt for an engine, including a screw head, a screw rod, a fixing block, and a nut. A screw head cover is provided on the top of the screw head. The screw head is connected to the screw rod downward. A limit ring is provided above the screw rod, a cavity is provided below the screw rod, a fixing block is inserted below the screw rod, and a nut is connected outside the screw rod.

[0006] Preferably, the screw head is circular. The screw head includes a screw head body, a rotation groove, a screw head cover, and anti-slip teeth. A rotation groove is provided on the top of the screw head body. The screw head cover is fixed above the rotation groove, and several anti-slip teeth are provided below the screw head body.

[0007] Preferably, the rotation groove is a straight groove or a cross groove.

[0008] Preferably, the screw rod includes an upper screw rod, a limiting ring, a threaded section, and an expansion section. The top of the upper screw rod is connected to a screw head. A limiting ring is provided on the outer side of the upper screw rod. The diameter of the limiting ring is larger than that of the upper screw rod. The upper screw rod is connected downward to the threaded section. External threads are evenly provided on the outer side of the threaded section. An expansion section is provided below the threaded section. Cavities for placing fixing blocks are provided inside the threaded section and the expansion section.

[0009] Preferably, a number of expansion grooves are evenly provided on the expansion section.

[0010] Preferably, the fixing block includes a top-in block, an expansion block, and an arc block. The top of the top-in block is arc-shaped. The top-in block is cylindrically arranged inside the threaded section. The top-in block is connected downward to the expansion block. The expansion block is frustum-shaped, with the diameter of the upper side smaller than that of the lower side. The bottom of the expansion block is connected to the arc block.

[0011] Preferably, the nut is a hexagonal nut and is arranged on the outer side of the threaded section.

[0012] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0013] 1. For the one-way limiting and assembled bolt for an engine of the present utility model, the limiting ring provided on the screw rod and the anti-slip tooth teeth provided at the bottom of the screw head increase the friction at the connection, prevent the bolt from falling off, and improve the stability and safety of the connection.

[0014] 2. For the one-way limiting and assembled bolt for an engine of the present utility model, the fixing block is inserted into the bottom of the screw rod to expand the expansion section of the screw rod, which plays a role in limiting and preventing the bolt from falling off unilaterally. The screw head cover provided on the screw head can prevent it from being forcibly disassembled by others.

Description of the Drawings

[0015] Figure 1 is the schematic diagram of the main structure of the one-way limiting and assembled bolt for an engine of the present utility model;

[0016] Figure 2 is the schematic diagram of the structure of installing the fixing block of the one-way limiting and assembled bolt for an engine of the present utility model;

[0017] Figure 3 is the schematic diagram of the structure of the one-way limiting and assembled bolt for an engine of the present utility model;

[0018] In the figure: 1 - screw head, 11 - screw head body, 12 - rotation groove, 13 - screw head cover, 14 - anti-slip tooth teeth, 2 - screw rod, 21 - upper screw rod, 22 - limiting ring, 23 - threaded section, 24 - expansion section, 241 - expansion groove, 3 - fixing block, 31 - top-in block, 32 - expansion block, 33 - arc block, 4 - nut.

Detailed Implementation Modes

[0019] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0020] Refer to Figures 1-3 , in the embodiment of the present utility model, a one-way limit assembled bolt for an engine includes a screw head 1, a screw rod 2, a fixing block 3, and a nut 4. The screw head 1 is circular and includes a screw head body 11, a rotation groove 12, a screw head cover 13, and anti-slip teeth 14. A rotation groove 12 is provided at the top of the screw head body 11. The rotation groove 12 is a flat groove or a cross groove. A screw head cover 13 is fixed above the rotation groove 12. A plurality of anti-slip teeth 14 are provided below the screw head body 11. The screw head 1 is connected downward to the screw rod 2. The screw rod 2 includes an upper screw rod 21, a limit ring 22, a threaded section 23, and an expansion section 24. The top of the upper screw rod 21 is connected to the screw head 1. A limit ring 22 is provided on the outer side of the upper screw rod 21. The diameter of the limit ring 22 is larger than the diameter of the upper screw rod 21. The upper screw rod 21 is connected downward to the threaded section 23. External threads are evenly provided on the outer side of the threaded section 23. An expansion section 24 is provided below the threaded section 23. A plurality of expansion grooves 241 are evenly provided on the expansion section 24. A cavity for placing the fixing block 3 is provided inside the threaded section 23 and the expansion section 24. A limit ring 22 is provided above the screw rod 2. A cavity is provided below the screw rod 2. The fixing block 3 is inserted into the lower side of the screw rod 2. The fixing block 3 includes a top-in block 31, an expansion block 32, and an arc block 33. The top of the top-in block 31 is arc-shaped. The top-in block 31 is cylindrically arranged in the threaded section 23. The top-in block 31 is connected downward to the expansion block 32. The expansion block 32 is frustum-shaped, and the diameter of the upper side is smaller than that of the lower side. The bottom of the expansion block 32 is connected to the arc block 33. The screw rod 2 is externally connected with a nut 4. The nut 4 is a hexagonal nut and is arranged outside the threaded section 23.

[0021] Working principle:

[0022] When the one-way limit assembled bolt for an engine of the present utility model is in use, the bottom of the screw rod 2 is inserted into the connection hole and rotated into the connection hole through the rotation groove 12 on the screw head 2. At this time, since the diameter of the limit ring 22 on the upper part of the screw rod 2 is larger than that of the screw rod, the connection part is limited and fixed. The bottom of the screw head 1 is closely attached to the connection surface, playing a role of anti-slip fixation. The lower side of the screw rod 2 passes through the connection body. After the nut 4 is rotatably installed on the threaded section 23, the fixing block 3 is inserted into the screw rod from the expansion section 24. Due to the arrangement of the expansion groove 241, the expansion section 24 is expanded outwards, so that the diameter of the expansion section 24 is larger than the diameter of the screw rod 2, and the bolt is fixed at the connection part to prevent the bolt from falling off. Finally, the screw head cover 13 is covered in the rotation groove 12, so that the rotation groove 12 is not eroded and the bolt is not easily rotated out.

[0023] The above embodiments are illustrative of the present utility model, not restrictive thereof. Any scheme obtained by simply transforming the present utility model falls within the protection scope of the present utility model.

Claims

1. A one-way limited assembly bolt for an engine, characterized in that: The invention comprises a screw head (1), a screw rod (2), a fixing block (3) and a nut (4); a screw head cover (13) is provided on the top of the screw head (1); the screw head (1) is connected downwardly to the screw rod (2); a limiting ring (22) is provided above the screw rod (2); a cavity is provided below the screw rod (2); a fixing block (3) is inserted on the lower side of the screw rod (2); and a nut (4) is externally connected to the screw rod (2).

2. The one-way limited assembly bolt for an engine as claimed in claim 1, characterized in that: The screw head (1) is circular and comprises a screw head body (11), a rotation groove (12), a screw head cover (13), and anti-slip teeth (14). The top of the screw head body (11) is provided with a rotation groove (12), the screw head cover (13) is fixed above the rotation groove (12), and a plurality of anti-slip teeth (14) are provided below the screw head body (11).

3. The one-way limited assembly bolt for an engine as claimed in claim 2, characterized in that: The rotating groove (12) is a straight groove or a cross groove.

4. The one-way limited assembly bolt for an engine as claimed in claim 1, characterized in that: The screw rod (2) comprises an upper screw rod (21), a limiting ring (22), a threaded section (23), and an expansion section (24); the top of the upper screw rod (21) is connected to the screw head (1); a limiting ring (22) is provided on the outer side of the upper screw rod (21); the diameter of the limiting ring (22) is larger than the diameter of the upper screw rod (21); the upper screw rod (21) is connected downwardly to the threaded section (23); the outer side of the threaded section (23) is evenly provided with external threads; an expansion section (24) is provided below the threaded section (23); and a cavity for placing a fixing block (3) is provided inside the threaded section (23) and the expansion section (24).

5. The one-way limited assembly bolt for an engine as claimed in claim 4, characterized in that: A plurality of expansion grooves (241) are evenly arranged on the expansion section (24).

6. The one-way limited assembly bolt for an engine as claimed in claim 1, characterized in that: The fixed block (3) comprises an insertion block (31), an expansion block (32), and an arc block (33); the top of the insertion block (31) is in an arc shape; the insertion block (31) is in a cylindrical shape and is arranged in the threaded section (23); the bottom of the insertion block (31) is connected to the expansion block (32); the expansion block (32) is in a truncated cone shape; the upper diameter of the expansion block (32) is smaller than the lower diameter; and the bottom of the expansion block (32) is connected to the arc block (33).

7. The one-way limited assembly bolt for an engine as claimed in claim 1, characterized in that: The nut (4) is a hexagonal nut and is arranged outside the threaded section (23).

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