An engine bolt mounting base structure

Abstract

This utility model relates to the field of fastening structure technology and discloses an engine bolt mounting seat structure, which includes a mounting seat body, a fastening bolt, and a washer. The fastening bolt engages with the threaded hole of the mounting seat body, and the washer is fitted onto the fastening bolt and positioned between the seat surface of the mounting seat body and the nut. The seat surface has multiple circumferentially spaced first grooves and multiple circumferentially spaced second grooves, which intersect to form a grid-like pattern. The grid-like pattern increases the microscopic contact area and surface roughness between the seat surface and the washer, generating a frictional resistance significantly higher than that of a smooth seat surface or concentric circular patterns. Furthermore, the multi-directional distribution of the first and second grooves within the seat surface plane provides isotropic anti-slip capability, forming a stable and high effective friction coefficient between the seat surface and the washer. This prevents the washer from rotating and causing large axial forces, thus preventing yielding deformation, cracking, and engine damage to the mounting seat body.

Description

Technical Field

[0001] This utility model relates to the field of fastening structure technology, and in particular to an engine bolt mounting base structure. Background Technology

[0002] The assembly process of engines requires high precision and reliability. Currently, aluminum alloy parts inside engines are generally fastened together, and significant axial forces are required in critical areas to ensure sealing, such as cylinder head cover bolts and crankshaft journal bolts.

[0003] like Figure 1 As shown, the bolt mounting base structure includes a mounting base body 1a, a fastening bolt 2a, and a steel washer 3a. The mounting base body 1a is made of aluminum alloy. When the fastening bolt 2a applies a large axial force to the mounting base body 1a, the steel washer 3a increases the contact area to prevent yielding of the seat surface 11a of the mounting base body 1a during the fastening process. Figure 2 As shown, the seat surface 11a of the existing bolt mounting seat is provided with concentric circles of texture about the central axis of the bolt hole 10a. The direction of the texture is consistent with the direction of rotation. The coefficient of friction between the steel washer 3a and the aluminum alloy seat surface is small. During the tightening process, the washer slides relative to the seat surface 11a and rotates with the fastening bolt 2a.

[0004] In summary, existing bolt mounting seats are prone to sliding friction between the seat surface and the washer. If the bolt is tightened to the set torque, a larger axial force will be generated. However, excessive axial force will cause the mounting seat body to yield and deform or even crack, thereby damaging the engine. Utility Model Content

[0005] The technical problem this invention aims to solve is that the existing bolt mounting base is prone to sliding friction between the seat surface and the washer. If the bolt is tightened to the set torque, a greater axial force will be generated, which will cause the mounting base body to yield and deform or even crack, damaging the engine.

[0006] To solve the above-mentioned technical problems, this utility model provides a technical solution for an engine bolt mounting base structure: the engine bolt mounting base structure includes a mounting base body, a fastening bolt and a washer, the mounting base body is provided with a threaded hole, and the fastening bolt is threadedly engaged with the threaded hole;

[0007] One end of the fastening bolt is provided with a nut, the mounting body is provided with a seat surface on the side facing the nut, and the washer is sleeved on the fastening bolt and located between the seat surface and the nut;

[0008] The seat surface is provided with a plurality of first grooves and a plurality of second grooves, the plurality of first grooves being spaced apart along the circumferential direction of the threaded hole, and the plurality of second grooves being spaced apart along the circumferential direction of the threaded hole;

[0009] The extension directions of the first groove and the second groove are respectively intersected with the tangent direction of the threaded hole, and the intersection of the first groove and the second groove forms a grid-like pattern.

[0010] Furthermore, the surface roughness ranges from Ra0.8 to Ra6.3.

[0011] Furthermore, both the first groove and the second groove are arc-shaped, extending radially from the inside to the outside along the threaded hole. The first groove is offset counterclockwise, and the second groove is offset clockwise.

[0012] Furthermore, the center of the circle containing the first groove and the center of the circle containing the second groove are respectively arranged close to the inner wall of the threaded hole, and the diameter of the circle containing the first groove and the diameter of the circle containing the second groove are both larger than the diameter of the threaded hole.

[0013] Furthermore, the contour shape of the seat surface is annular, and the diameter of the circle containing the first groove and the diameter of the circle containing the second groove are both smaller than the outer ring diameter of the seat surface.

[0014] Furthermore, the side of the first groove away from the threaded hole is tangent to the outer ring of the seat surface, and the side of the second groove away from the threaded hole is tangent to the outer ring of the seat surface.

[0015] Furthermore, each of the first grooves and one of the second grooves are arranged in a cocircular pattern.

[0016] Furthermore, the depth of the first groove is equal to the depth of the second groove, and the depths of both the first groove and the second groove are within the range of 1.0 mm to 1.5 mm.

[0017] Compared with the prior art, the engine bolt mounting seat structure of this utility model has the following advantages: The engine bolt mounting seat structure adopts a design of mounting seat body, fastening bolt, and washer. The fastening bolt mates with the threaded hole of the mounting seat body, and the washer is fitted onto the fastening bolt and positioned between the seat surface of the mounting seat body and the nut, thereby increasing the contact area. Furthermore, the seat surface is provided with multiple circumferentially spaced first grooves and multiple circumferentially spaced second grooves, which intersect to form a grid-like pattern.

[0018] The grid pattern divides the seat surface into numerous small contact areas. When the fastening bolts are tightened, the axial pressure is evenly distributed to the grid-like protrusions, avoiding local stress concentration and reducing the risk of plastic deformation of the seat surface.

[0019] More importantly, the grid-like texture increases the microscopic contact area and surface roughness between the seat and the washer, generating significantly higher frictional resistance than a smooth seat or concentric circular texture. Furthermore, the multi-directional distribution of the first and second grooves within the seat plane provides isotropic anti-slip capability, thus creating a stable and high effective coefficient of friction between the seat and the washer. This avoids situations where the washer rotates, leading to large axial forces and preventing problems such as yielding deformation, cracking, and engine damage to the mounting bracket body. Attached Figure Description

[0020] Figure 1 This is an axial sectional view of an existing bolt mounting seat structure in the background art;

[0021] Figure 2 This is a three-dimensional schematic diagram of the mounting base body in the background art;

[0022] Figure 3 This is an axial sectional view of the engine bolt mounting seat structure in an embodiment of this utility model;

[0023] Figure 4 This is a three-dimensional schematic diagram of the mounting base body in an embodiment of this utility model;

[0024] Figure 5 This is a top view of the mounting base body in an embodiment of this utility model;

[0025] Figure 6 yes Figure 5 A magnified view of a section at point A in the middle;

[0026] Figure 7 This is a schematic diagram of the seat surface machining of the mounting base body in an embodiment of this utility model;

[0027] Figure 1 , Figure 2 In the middle: 1a, mounting base body; 10a, threaded hole; 11a, seat surface; 2a, fastening bolt; 3a, steel washer;

[0028] Figures 3 to 7 In the middle: 1. Mounting base body; 10. Threaded hole; 11. Seat surface; 111. First groove; 112. Second groove; 2. Fastening bolt; 20. Nut; 3. Washer; 4. Milling path of milling cutter; 40. Center trajectory of milling cutter. Detailed Implementation

[0029] The specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but are not intended to limit its scope.

[0030] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise" used to indicate the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0031] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0032] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0033] like Figures 3 to 6 As shown, an engine bolt mounting bracket structure according to an embodiment of the present invention includes a mounting bracket body 1, a fastening bolt 2, and a washer 3. The mounting bracket body 1 has a threaded hole 10, and the fastening bolt 2 is threadedly engaged with the threaded hole 10. One end of the fastening bolt 2 is provided with a nut 20, and the mounting bracket body 1 has a seat surface 11 on the side facing the nut 20. The washer 3 is sleeved on the fastening bolt 2 and is located between the seat surface 11 and the nut 20.

[0034] The seat surface 11 is provided with a plurality of first grooves 111 and a plurality of second grooves 112. The plurality of first grooves 111 are spaced apart along the circumferential direction of the threaded hole 10, and the plurality of second grooves 112 are spaced apart along the circumferential direction of the threaded hole 10. The extension direction of the first grooves 111 and the extension direction of the second grooves 112 are respectively intersected with the tangent direction of the threaded hole 10, and the plurality of first grooves 111 and the plurality of second grooves 112 intersect to form a grid-like pattern.

[0035] The engine bolt mounting base structure adopts a design consisting of a mounting base body 1, a fastening bolt 2, and a washer 3. The fastening bolt 2 mates with the threaded hole 10 of the mounting base body 1. The washer 3 is fitted onto the fastening bolt 2 and positioned between the seat surface 11 of the mounting base body 1 and the nut 20, thereby increasing the contact area. Furthermore, the seat surface 11 is provided with multiple circumferentially spaced first grooves 111 and multiple circumferentially spaced second grooves 112. The multiple first grooves 111 and multiple second grooves 112 intersect to form a grid-like pattern. This grid-like pattern divides the seat surface 11 into numerous small contact areas. When the fastening bolt 2 is tightened, the axial pressure is evenly distributed onto the grid-like protrusions, avoiding localized stress concentration and reducing the risk of plastic deformation of the seat surface 11.

[0036] More importantly, the mesh-like texture increases the microscopic contact area and surface roughness between the seat surface 11 and the washer 3, generating significantly higher frictional resistance than a smooth seat surface 11 or a concentric circle texture. Furthermore, the multi-directional distribution of the first groove 111 and the second groove 112 within the plane of the seat surface 11 provides isotropic anti-slip capability, thus forming a stable and high effective coefficient of friction between the seat surface 11 and the washer 3. This avoids the situation where the washer 3 rotates, resulting in large axial forces, and prevents problems such as yielding deformation, cracking, and engine damage to the mounting body 1.

[0037] In this embodiment, the roughness range of the seat surface 11 is Ra0.8 to Ra6.3. When the roughness of the seat surface 11 is less than Ra0.8, the frictional force between the seat surface 11 and the washer 2, and the frictional force between the washer 2 and the nut 20 are relatively close, and there is still a possibility that the washer 3 will rotate with the fastening bolt 2. When the roughness of the seat surface 11 is greater than Ra6.3, the seat surface 11 is prone to micro-yield deformation, which affects the magnitude of the axial force when the fastening bolt 3 is tightened. When the roughness of the seat surface 11 reaches Ra0.8 to Ra6.3, the seat surface 11 generates a moderate frictional force on the washer 3, ensuring that the washer 3 does not rotate with the bolt 2, thus ensuring the uniqueness of the friction state.

[0038] As a further preferred embodiment, both the first groove 111 and the second groove 112 are arc-shaped, such as... Figures 4 to 6As shown, along the radial direction of the threaded hole 10 from the inside out, the extension direction of the first groove 111 is deflected counterclockwise, and the extension direction of the second groove 112 is deflected clockwise. Furthermore, the centers of the circles containing the first groove 111 and the second groove 112 are respectively located close to the inner wall of the threaded hole 10, and the diameters of both the circles containing the first groove 111 and the second groove 112 are larger than the diameter of the threaded hole 10.

[0039] It should be noted that the outline shape of the seat surface 11 is annular, and the diameters of the circles containing the first groove 111 and the second groove 112 are both smaller than the outer ring diameter of the seat surface 11. The side of the first groove 111 away from the threaded hole 10 is tangent to the outer ring of the seat surface 11, and the side of the second groove 112 away from the threaded hole 10 is tangent to the outer ring of the seat surface 11. Any one of the first grooves 111 and one of the second grooves 112 are arranged in a cocircular pattern.

[0040] In addition, the depth of the first groove 111 is equal to the depth of the second groove 112, and the depths of both the first groove 111 and the second groove 112 are within the range of 1.0mm to 1.5mm.

[0041] Regarding the processing of the grid pattern on seat 11:

[0042] like Figure 7 As shown, the outer ring diameter of the seat surface 11 is selected as 21mm, the maximum inner diameter of the threaded hole 10 is 9.5mm, and a milling cutter with an outer diameter of 12mm is used. The center trajectory 40 of the milling cutter is a circle with a diameter of 9mm and the central axis of the threaded hole 10 as the center of the revolution. The milling allowance is 1.2mm, the milling cutter speed is 2800rpm, and the feed rate is 600mm / min. The entire seat surface 11 is milled in one circle along the center trajectory 40 of the milling cutter (close to the inner wall of the threaded hole 10) to obtain a grid-like texture.

[0043] It should be noted that the part where the milling path 4 intersects with the seat surface 11 forms the first groove 111 and the second groove 112. Furthermore, the milling path 4 is tangent to the outer ring of the seat surface 11. The first groove 111 is formed on the side of the milling path 4 where the tangent point faces the counterclockwise direction, and the second groove 112 is formed on the side of the milling path 4 where the tangent point faces the clockwise direction. The machining method is simple and efficient.

[0044] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of the present utility model, and these improvements and substitutions should also be considered within the protection scope of the present utility model.

Claims

1. An engine bolt mounting structure characterized by, It includes a mounting base body, fastening bolts, and washers. The mounting base body has a threaded hole, and the fastening bolts are threadedly engaged with the threaded hole. One end of the fastening bolt is provided with a nut, the mounting body is provided with a seat surface on the side facing the nut, and the washer is sleeved on the fastening bolt and located between the seat surface and the nut; The seat surface is provided with a plurality of first grooves and a plurality of second grooves, the plurality of first grooves being spaced apart along the circumferential direction of the threaded hole, and the plurality of second grooves being spaced apart along the circumferential direction of the threaded hole; The extension directions of the first groove and the second groove are respectively intersected with the tangent direction of the threaded hole, and the intersection of the first groove and the second groove forms a grid-like pattern.

2. The engine bolt mounting structure according to claim 1, characterized by, The surface roughness ranges from Ra0.8 to Ra6.

3.

3. The engine bolt mounting structure according to claim 2, characterized by, Both the first groove and the second groove are arc-shaped, extending radially from the inside to the outside of the threaded hole. The first groove extends counterclockwise, and the second groove extends clockwise.

4. The engine bolt mounting structure according to claim 3, characterized by The center of the circle containing the first groove and the center of the circle containing the second groove are respectively arranged close to the inner wall of the threaded hole, and the diameter of the circle containing the first groove and the diameter of the circle containing the second groove are both larger than the diameter of the threaded hole.

5. The engine bolt mounting structure according to claim 1 or 2 or 3, characterized by, The seat surface has a circular outline, and the diameters of the circles containing the first and second grooves are both smaller than the outer ring diameter of the seat surface.

6. The engine bolt mount structure of claim 5 wherein, The side of the first groove away from the threaded hole is tangent to the outer ring of the seat surface, and the side of the second groove away from the threaded hole is tangent to the outer ring of the seat surface.

7. The engine bolt mounting structure according to claim 6, wherein Each of the first grooves and one of the second grooves are arranged in a cocircular pattern.

8. The engine bolt mount structure of claim 1 wherein, The depth of the first groove is equal to the depth of the second groove, and the depths of both the first groove and the second groove are within the range of 1.0 mm to 1.5 mm.

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