Split type engine guide rail bolt

Abstract

The utility model discloses a split type engine guide rail bolt, and relates to the technical field of engines. A head part, a guide rail matching part and a rod part are sequentially and coaxially constructed in the axis direction of the bolt, the diameter of the head part is larger than that of the guide rail matching part and larger than that of the rod part, and positioning threads are constructed on the outer portion of the side, away from the guide rail matching part, of the rod part. A supporting reinforcing section is constructed at the position, between the positioning thread and the guide rail matching part, of the rod part, the outer wall of the supporting reinforcing section is coated with a cushion cover in a sleeving mode, and the outer diameter of the cushion cover is the same as that of the guide rail matching part; the bolt strength is increased, safety is improved, and the problem that an existing guide rail bolt is prone to breakage is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of engines, in particular to a split engine guide rail bolt. Background Art

[0002] Engine guides are critical mechanical components used in a wide range of engines, including motorcycles, diesel engines, and gasoline engines. Their primary function is to support and guide the chain, ensuring it runs along its designed trajectory, thereby ensuring proper engine operation and efficient performance.

[0003] At present, some engine guide rail bolts on the market adopt an integral full-thread structure. There is a back-cut groove at the root of the bolt and it is located at the joint surface of the guide rail and the cylinder head. It is easy to break and its reliability is difficult to be effectively guaranteed. Utility Model Content

[0004] The purpose of the utility model is to provide a split engine guide rail bolt, which increases the bolt strength, improves the safety, and solves the problem that the existing guide rail bolts are easy to break.

[0005] In order to solve the above problems, the present invention adopts the following technical means:

[0006] A split engine guide rail bolt has a head, a guide rail fitting part and a rod part coaxially constructed in sequence along the axis direction of the bolt. The diameter of the head is larger than the diameter of the guide rail fitting part and the diameter of the rod part. A positioning thread is constructed on the outside of the rod part away from the guide rail fitting part. The rod part is located between the positioning thread and the guide rail fitting part and is constructed with a support reinforcement section. The outer wall of the support reinforcement section is covered with a sleeve, and the outer diameter of the sleeve is set to be the same as the outer diameter of the guide rail fitting part.

[0007] Preferably, the rod portion is connected to the guide rail matching portion through a smooth arc-shaped root portion, and no tool withdrawal groove is provided on the root portion.

[0008] Furthermore, a surface of the head portion facing the guide rail fitting portion abuts against a surface of the guide rail to be positioned.

[0009] Furthermore, the sum of the lengths of the guide rail fitting portion and the gasket along the axial direction is greater than the length of the guide rail to be positioned along the axial direction of the bolt.

[0010] Furthermore, a hexagonal screw hole is coaxially configured on a side of the head facing away from the guide rail fitting portion.

[0011] Furthermore, the corners at both ends of the side where the cushion cover is in contact with the support reinforcement section are constructed as arc-shaped corners.

[0012] During use, the utility model has the following beneficial effects:

[0013] A non-full thread is set on the rod of the bolt, that is, the supporting reinforcement section and the part with the positioning thread constitute the rod, and the part with the positioning thread is constructed as the positioning part with the cylinder head, and then the supporting reinforcement section is provided with a gasket, and together with the guide rail matching part forms a limit part that abuts the inner wall of the guide rail to be positioned, and the gasket is used to abut the surface of the cylinder head, which can effectively increase the reliability of the bolt in the positioning state. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic structural diagram of the utility model.

[0015] Figure 2 This is a schematic diagram of the installation structure of the utility model.

[0016] Among them, 1-head, 2-guide rail matching part, 3-rod, 4-positioning thread, 5-support reinforcement section, 6-washer sleeve, 7-root, 8-guide rail, 9-hexagonal screw hole, 10-cylinder head. DETAILED DESCRIPTION

[0017] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0018] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but rather merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0019] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0020] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0021] In the description of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," "outer," and the like, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the product of the present invention is typically placed when in use, or are the orientations or positional relationships commonly understood by those skilled in the art. These terms are intended solely to facilitate the description of the present invention and to simplify the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used solely to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0022] It should also be noted that, in the description of this utility model, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0023] Please refer to Figure 1 and Figure 2 As shown, a split engine guide rail bolt is coaxially constructed with a head 1, a guide rail fitting part 2 and a rod 3 along the axis of the bolt. The diameter of the head 1 is larger than the diameter of the guide rail fitting part 2, which is larger than the diameter of the rod 3. A positioning thread 4 is constructed on the outside of the rod 3 away from the guide rail fitting part 2. A support reinforcement section 5 is constructed on the rod 3 between the positioning thread 4 and the guide rail fitting part 2. The outer wall of the support reinforcement section 5 is covered with a sleeve 6, and the outer diameter of the sleeve 6 is set to be the same as the outer diameter of the guide rail fitting part 2.

[0024] In this way, a non-full thread is provided on the rod 3 of the bolt, that is, the supporting reinforcement section 5 and the part with the positioning thread 4 constitute the rod 3, and the part with the positioning thread 4 is constructed as the positioning part with the cylinder head 10, and then the supporting reinforcement section 5 is provided with a gasket 6, and together with the guide rail matching part 2 forms a limiting part that abuts the inner wall of the guide rail 8 to be positioned, and the gasket 6 is used to abut the surface of the cylinder head 10, which can effectively increase the reliability of the bolt in the positioning state.

[0025] Furthermore, the rod portion 3 is connected to the guide rail matching portion 2 via a smooth arc-shaped root portion 7 , and no backing groove is provided on the root portion 7 .

[0026] In this way, by setting up without a back-cut groove, the possibility of the bolt breaking can be effectively reduced, making the entire bolt safe and reliable during the positioning and installation process.

[0027] More specifically, a surface of the head portion 1 facing the guide rail fitting portion 2 abuts against a surface of the guide rail 8 to be positioned.

[0028] In this way, by utilizing the abutment between the head 1 and the guide rail 8 to be positioned, the abutment surfaces of the head 1 and the guide rail 8 to be positioned can form a retaining edge, thereby preventing the guide rail 8 from falling out in the positioned state.

[0029] Furthermore, the sum of the lengths of the guide rail fitting portion 2 and the washer sleeve 6 along the axial direction is greater than the length of the guide rail 8 to be positioned along the axial direction of the bolt.

[0030] In this way, after the guide rail 8 is positioned, there is enough play between the guide rail 8 and the head 1 to prevent the guide rail 8 from getting stuck.

[0031] In order to facilitate the installation of the entire bolt, a hexagonal screw hole 9 is coaxially configured on a side of the head 1 facing away from the guide rail fitting portion 2 .

[0032] Furthermore, it avoids the gasket 6 from causing a lot of wear on the smooth support reinforcement section 5 during repeated disassembly and assembly, and the corners at both ends of the side where the gasket 6 is in contact with the support reinforcement section 5 are constructed as arc-shaped corners.

[0033] In this way, the arc-shaped corner structure can effectively reduce the wear between the support reinforcement section 5 and the washer 6 during the continuous disassembly and assembly process, and further improve the service life of the entire bolt.

[0034] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments, or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A split engine rail bolt, characterized in that: A head (1), a guide rail fitting portion (2) and a rod portion (3) are coaxially constructed in sequence along the bolt axis. The diameter of the head (1) is larger than the diameter of the guide rail fitting portion (2), which is larger than the diameter of the rod portion (3). A positioning thread (4) is constructed on the outside of the rod portion (3) away from the guide rail fitting portion (2). A support reinforcement section (5) is constructed on the rod portion (3) between the positioning thread (4) and the guide rail fitting portion (2). The outer wall of the support reinforcement section (5) is covered with a sleeve (6). The outer diameter of the sleeve (6) is set to be the same as the outer diameter of the guide rail fitting portion (2).

2. A split engine rail bolt according to claim 1, characterized in that: The rod portion (3) is connected to the guide rail matching portion (2) via a smooth arc-shaped root portion (7), and no backing groove is provided on the root portion (7).

3. The split engine rail bolt according to claim 1, characterized in that: The side of the head (1) facing the guide rail matching portion (2) abuts against the surface of the guide rail (8) to be positioned.

4. The split engine rail bolt according to claim 1, characterized in that: The sum of the lengths of the guide rail fitting portion (2) and the washer sleeve (6) along the axial direction is greater than the length of the guide rail (8) to be positioned along the axial direction of the bolt.

5. The split engine rail bolt according to claim 1, characterized in that: A hexagonal screw hole (9) is coaxially configured on a side of the head (1) facing away from the guide rail fitting portion (2).

6. The split engine rail bolt according to claim 1, characterized in that: The corners at both ends of the side where the cushion sleeve (6) fits the support reinforcement section (5) are constructed as arc-shaped corners.

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