Backlash initiator center bolt lubrication structure

Abstract

In order to solve the problems that the existing center bolt lubricating method of backflush starter increases the friction resistance between the upper surface of the wheel cover and the bottom surface of the center bolt washer, the utility model discloses a backflush starter center bolt lubricating structure, the center bolt is an integral structure, and comprises a nut, a washer, a column section and a threaded section from top to bottom, characterized in that an annular oil storage groove with a semicircular cross section is arranged on the bottom surface of the center bolt washer, the inner diameter of the annular oil storage groove is larger than the diameter of the column section of the center bolt, and the outer diameter of the annular oil storage groove is smaller than the outer diameter of the washer. The backflush starter center bolt lubricating structure has the beneficial technical effects that the lubricant cannot be squeezed out or volatilized, the upper surface of the wheel cover and the bottom surface of the center bolt washer are well lubricated, the wheel disc back position jamming phenomenon is avoided, and the surface of the wheel cover is prevented from being damaged.

Description

Technical Field

[0001] This utility model relates to the lubrication technology of the center bolt of the recoil starter for small gasoline and diesel engines, and in particular to a lubrication structure for the center bolt of the recoil starter. Background Technology

[0002] The recoil starter is a key component of small gasoline and diesel engines. Its function is to rapidly rotate the engine's flywheel by quickly pulling the starter's cable, thereby driving the engine crankshaft. For diesel engines, the rapid rotation of the flywheel causes the compression ratio in the cylinders to reach the diesel fuel's knock-off point, achieving combustion and enabling the engine to operate normally. For gasoline engines, the rapid rotation of the flywheel simultaneously activates the ignition system, enabling the engine to operate normally. Typically, a recoil starter includes a housing, a wheel cover, and a center bolt. The center bolt secures the wheel cover, along with its internal coil spring, wheel, and cable, to the center of the housing. The wheel cover, along with its internal coil spring, wheel, and cable, is mounted on the center bolt and can rotate around it (see Appendix). Figure 1 In the diagram, A is the center bolt, B is the wheel cover, and C is the housing. The center bolt is a single-piece structure, consisting of a nut, washer, cylindrical section, and threaded section from top to bottom (see attached diagram). Figure 2 The wheel cover, along with its internal coil spring, wheel, and pull rope, is installed on the cylindrical section of the central bolt. When the pull rope is pulled, the wheel and wheel cover rotate along the axis of the central bolt. Since the upper surface of the wheel cover is in contact with the bottom surface of the central bolt washer, surface friction will occur between the upper surface of the wheel cover and the bottom surface of the central bolt washer when the wheel cover rotates (see Appendix). Figure 3 In the diagram, A is the center bolt, B is the wheel cover, and D is the friction surface. To reduce frictional resistance and prevent damage to the wheel cover surface, lubricant is usually applied to the upper surface of the wheel cover during assembly. However, after a period of use, the lubricant may be squeezed out of the contact surface or evaporate, causing a significant increase in the frictional resistance between the upper surface of the wheel cover and the bottom surface of the center bolt washer. This can lead to wheel disc repositioning difficulties and, in severe cases, damage to the wheel cover surface.

[0003] Obviously, the existing lubrication method for the center bolt of the recoil starter has problems such as the lubricating oil being squeezed out or evaporated, resulting in a significant increase in the frictional resistance between the upper surface of the wheel cover and the bottom surface of the washer of the center bolt. Summary of the Invention

[0004] To address the problems in existing recoil starter center bolt lubrication methods, such as the lubricating oil being squeezed out or evaporating, leading to a significant increase in frictional resistance between the upper surface of the wheel cover and the bottom surface of the center bolt washer, this utility model proposes a recoil starter center bolt lubrication structure.

[0005] This utility model relates to a lubrication structure for the central bolt of a recoil starter. The central bolt is an integral structure comprising a nut, a washer, a cylindrical section, and a threaded section from top to bottom. Its distinguishing feature is that an annular oil reservoir with a semi-circular cross-section is provided on the bottom surface of the central bolt washer. The inner diameter of the annular oil reservoir is larger than the diameter of the cylindrical section of the central bolt, while its outer diameter is smaller than the outer diameter of the washer.

[0006] The beneficial technical effect of the lubrication structure of the center bolt of the recoil starter is that it can ensure that the lubricant is not squeezed out or evaporated, ensure good lubrication between the upper surface of the wheel cover and the bottom surface of the center bolt washer, avoid wheel return jamming, and avoid damage to the surface of the wheel cover. Attached Figure Description

[0007] Appendix Figure 1 A three-dimensional schematic diagram of an existing recoil starter;

[0008] Appendix Figure 2 A 3D schematic diagram of the center bolt of a conventional recoil starter.

[0009] Appendix Figure 3 This is a partial cross-sectional schematic diagram of a conventional recoil starter;

[0010] Appendix Figure 4 This is a three-dimensional schematic diagram of the center bolt of the recoil starter of this utility model;

[0011] Appendix Figure 5 This is a partial cross-sectional view of the recoil starter of this utility model.

[0012] In the diagram, A is the center bolt, B is the wheel cover, C is the cover, D is the friction surface, and 1 is the annular oil reservoir.

[0013] The lubrication structure of the center bolt of the recoil starter of this utility model will be further described below with reference to the accompanying drawings and specific embodiments. Detailed Implementation

[0014] See appendix Figure 4 , 5This utility model discloses a lubrication structure for the center bolt of a recoil starter. The center bolt is an integral structure comprising a nut, a washer, a cylindrical section, and a threaded section from top to bottom. Its key feature is the presence of an annular oil reservoir 1 with a semi-circular cross-section on the bottom surface of the center bolt washer. The inner diameter of the annular oil reservoir is larger than the diameter of the cylindrical section of the center bolt, while its outer diameter is smaller than the outer diameter of the washer. Because the inner diameter of the oil reservoir is larger than the diameter of the cylindrical section of the center bolt, and its outer diameter is smaller than the outer diameter of the washer, the annular oil reservoir forms an annular sealed cavity when the bottom surface of the center bolt washer contacts the upper surface of the wheel cover. Thus, the lubricant added during assembly is sealed within the annular cavity, preventing it from being squeezed out of the friction surface or evaporating, thereby ensuring good lubrication between the upper surface of the wheel cover and the bottom surface of the center bolt washer, preventing wheel return jamming, and avoiding damage to the surface of the wheel cover.

[0015] Obviously, the beneficial technical effect of the lubrication structure of the center bolt of the recoil starter of this utility model is that it can ensure that the lubricant is not squeezed out or evaporated, ensure good lubrication between the upper surface of the wheel cover and the bottom surface of the center bolt washer, avoid wheel return jamming, and avoid damage to the surface of the wheel cover.

Claims

1. A lubrication structure for the center bolt of a recoil starter, wherein the center bolt is an integral structure comprising, from top to bottom, a nut, a washer, a cylindrical section, and a threaded section, characterized in that, An annular oil reservoir with a semi-circular cross-section is provided on the bottom surface of the central bolt washer; the inner diameter of the annular oil reservoir is larger than the diameter of the central bolt column section, and the outer diameter is smaller than the outer diameter of the washer.

Images