Protective rubber plug structure for exposed screw hole of engine gear chamber

Abstract

An engine gear chamber exposed screw hole protection rubber plug structure comprises an engine gear chamber and a screw hole protection rubber plug. A spare exposed screw hole is reserved in an engine gear chamber, when some spare screw holes are not needed, the protective rubber plug is plugged through a rubber plug installation tool, and the screw hole protective rubber plug is an integrally-manufactured circular truncated cone and comprises a guide cylinder at the small end, a fixing block in the middle and a sealing body at the large end. The guide cylinder at the small end of the screw hole protection rubber plug is a truncated cone, and the conical surface of the truncated cone is in a circular truncated cone shape. A fixing block in the middle of the screw hole protection rubber plug is a cylinder, the length of the fixing block is half of the diameter of the exposed screw hole, and the fixing block is in interference fit with the cylindrical surface where the small diameter of the exposed screw hole is located. The fixed block of the screw hole protection rubber plug is in interference fit with the screw hole and is not easy to fall off; the sealing body is tightly attached to the end face of the screw hole, sealing performance is good, and the screw hole is not prone to rusting due to water inflow; and the screw hole protection rubber plug is mounted by adopting a special rubber plug mounting tool. The structure can also be used for sealing screw holes of similar structures in the machinery manufacturing industry.

Description

Technical Field

[0001] The utility model belongs to the field of engine manufacturing, and relates to a screw hole protective rubber plug structure, in particular to an engine gear chamber exposed screw hole protective rubber plug structure with low cost and good effect. Background Art

[0002] As we all know, during the manufacturing and installation of engines, according to the different needs of manufacturers and users, some engines require the installation of auxiliary parts, and screw holes need to be processed on the basic parts of the engine. When some engines do not need to install auxiliary parts, the original screw holes on the basic parts of the engine become redundant. If the redundant screw holes on the engine are not protected, they may rust when the host is stored or used by the user, thus affecting the appearance quality of the engine. There are many ways to protect the exposed screw holes of the engine, some use plastic plugs, some use truncated cone rubber plugs, some use plastic tapes, and some use installation bolts for protection. Each of these screw hole protection measures has different disadvantages. Plastic plugs are not tightly sealed and are easy to fall off due to aging; plastic tapes are more likely to be smashed during use, and when there is anti-rust oil on the parts, the tapes are easily contaminated and fall off; truncated cone rubber plugs are easy to be hit and fall off during use; bolts are relatively expensive and are not suitable for large-scale use. Therefore, it is very important to reliably protect the exposed screw holes of the engine at a low cost.

[0003] In summary, in order to ensure that the exposed screw holes outside the engine gear chamber do not rust, it is absolutely necessary to provide a screw hole protective rubber plug structure with low cost, easy installation and good sealing performance. Utility Model Content

[0004] The utility model aims to solve the problems existing in the prior art and to provide an engine gear chamber screw hole protective rubber plug structure which has low cost, is not easy to fall off, is easy to install and has good protective effect.

[0005] The utility model achieves the above-mentioned purpose through the following technical scheme: a protective rubber plug structure for exposed screw holes in an engine gear chamber, comprising: an engine gear chamber and a screw hole protective rubber plug; there are redundant exposed screw holes LK in the engine gear chamber, the screw hole protective rubber plug is press-fitted into the exposed screw hole LK on the engine gear chamber through a rubber plug installation tool, the screw hole protective rubber plug is an integrally manufactured frustum, comprising a guide cylinder at a small end, a fixing block in the middle, and a sealing body at a large end.

[0006] The guiding cylinder at the small end of the screw hole protective plug is a truncated right cone, whose cone surface is a truncated cone, and the diameter d1 of the small end of the truncated right cone is smaller than the small diameter of the screw hole.

[0007] The fixing block in the middle of the screw hole protective plug is a cylinder, whose length L is half the diameter of the exposed screw hole LK, and whose diameter d2 is larger than the upper deviation of the exposed screw hole minor diameter by 0.30mm, and has an interference fit with the cylindrical surface where the minor diameter of the exposed screw hole LK is located.

[0008] The sealing body at the large end of the screw hole protective plug is a large cylinder, and its diameter d3 is 1-2mm larger than the chamfer of the exposed screw hole LK. There is a blind hole in the middle of the end face of the sealing body, and its diameter d4 ensures that the wall thickness of the screw hole protective plug is 1.5-4mm according to the screw hole diameter.

[0009] The utility model can achieve the following positive effects after adopting the above technical solution: the fixing block of the engine gear room screw hole protective rubber plug and the screw hole adopt interference fit, which is not easy to fall off; the sealing body of the engine gear room screw hole protective rubber plug and the screw hole end face are tightly fitted, the sealing performance is good, and it is not easy for water to enter and cause the screw hole to rust; the engine gear room screw hole protective rubber plug can be installed with a special rubber plug installation tool, which is convenient to install. The structure can also be used for screw hole sealing of similar structures in the machinery manufacturing industry. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 This is a schematic diagram of the main structure of a protective rubber plug structure for exposed screw holes in an engine gear chamber according to the utility model;

[0011] Figure 2 It is a side view structural schematic diagram of a protective rubber plug structure for exposed screw holes in an engine gear chamber according to the utility model;

[0012] Figure 3 It is a schematic diagram of the main structure of an engine gear chamber screw hole protection rubber plug structure of an engine gear chamber exposed screw hole protection rubber plug of the utility model.

[0013] In the figure: 1 - engine gear chamber, 2 - screw hole protective rubber plug, 2.1 - guide cone, 2.2 - fixing block, 2.3 - sealing body, 2.4 - blind hole; 3 - rubber plug installation tool, 3.1 - pressure head, 3.2 - handle,

[0014] LK—exposed screw hole, d1—diameter of the small end of the truncated cone, d2—diameter of the cylinder, d3—diameter of the large cylinder, d4—diameter of the blind hole. DETAILED DESCRIPTION

[0015] The present invention will be further described below in conjunction with the accompanying drawings and embodiments. Figures 1 to 3 As shown, a protective rubber plug structure for exposed screw holes in an engine gear chamber comprises: an engine gear chamber 1 and a screw hole protective rubber plug 2; because some models use these screw holes to install oil pipe brackets, extra exposed screw holes LK are left on the engine gear chamber 1, and the screw hole protective rubber plug 2 is press-fitted into the exposed screw hole LK of the engine gear chamber 1 by a rubber plug installation tool 3.

[0016] The guide cylinder 2.1 at the small end of the screw hole protective rubber plug 2 is a truncated cone (conical frustum), and the diameter d1 of the small end of the truncated cone is smaller than the minor diameter of the exposed screw hole LK, which is convenient for identification; the fixing block 2.2 in the middle of the screw hole protective rubber plug 2 is a cylinder, and the upper deviation of its diameter d2 than the minor diameter of the screw hole LK is 0.30mm, and it is an interference fit with the cylindrical surface where the minor diameter of the exposed screw hole LK is located, and its length L is half of the diameter of the exposed screw hole LK or slightly larger, so as to avoid the screw hole protective rubber plug 2 The sealing body 2.3 at the large end of the screw hole protective rubber plug 2 is a large cylinder, and its diameter d3 is 1-2mm larger than the chamfer of the exposed screw hole LK. After installation, the inner end face of the sealing body 2.3 fits tightly with the end face of the exposed screw hole LK to prevent water from entering and causing rust on the exposed screw hole LK. There is a blind hole 2.4 with a blind hole diameter d4 in the middle of the outer end face of the sealing body 2.3, and its diameter d4 ensures that the wall thickness of the screw hole protective rubber plug is 1.5-4mm according to the screw hole diameter. It is used for installation using the rubber plug installation tool 3, and the fixing block 2.2 of the screw hole protective rubber plug 2 is easy to shrink during installation, making installation easier.

[0017] During installation, first insert the pressure head 3.1 of the rubber plug installation tool 3 into the blind hole 2.4 of the threaded protective rubber plug 2, then insert the front part 2.1 of the threaded protective rubber plug 2 mounted on the tooling into the opening of the exposed screw hole LK of the gear chamber 1, and press it into the exposed screw hole LK until the inner end face of the sealing body 2.3 fits with the end face of the exposed screw hole LK, and then pull out the rubber plug installation tool 3.

[0018] In summary, the front part of the engine gear room screw hole protection rubber plug is a conical frustum, which is easy to identify and has good guiding performance; the middle fixing block is a cylinder, which is an interference fit with the exposed screw hole to prevent loosening; the sealing body fits the end face of the exposed screw hole to ensure sealing performance; the rubber plug installation tool ensures the smooth installation of the exposed screw hole protection rubber plug, so that the exposed screw hole can be sealed with the rubber plug. Therefore, the engine gear room exposed screw hole protection rubber plug structure has good sealing performance, high reliability and good anti-rust effect.

[0019] The practical application of the present invention is not limited to the situation described in this example, and all technical solutions and improvements that do not deviate from the substantial content of the present invention should fall within the protection scope of the claims of the present invention.

Claims

1. A protective rubber plug structure for exposed screw holes outside an engine gear chamber, comprising: An engine gear chamber (1) and a screw hole protective rubber plug (2); the characteristics are: there are redundant exposed screw holes LK on the engine gear chamber (1); the screw hole protective rubber plug (2) is press-fitted into the exposed screw hole LK on the engine gear chamber (1) by means of a rubber plug installation tool (3); the screw hole protective rubber plug (2) is an integrally manufactured truncated cone body, comprising a guide cylinder (2.1) at a small end, a fixing block (2.2) in the middle, and a sealing body (2.3) at a large end.

2. The protective rubber plug structure for exposed screw holes in an engine gear housing according to claim 1, characterized in that: The guide cylinder (2.1) at the small end of the screw hole protective rubber plug (2) is a truncated right cone, whose cone surface is a frustum, and the diameter d1 of the small end of the truncated right cone is smaller than the small diameter of the screw hole.

3. The protective rubber plug structure for exposed screw holes in an engine gear housing according to claim 1, characterized in that: The fixing block (2.2) in the middle of the screw hole protective rubber plug (2) is a cylinder, whose length L is half the diameter of the exposed screw hole LK, and whose diameter d2 is greater than the upper deviation of the minor diameter of the exposed screw hole by 0.30 mm, and forms an interference fit with the cylindrical surface where the minor diameter of the exposed screw hole LK is located.

4. The protective rubber plug structure for exposed screw holes in an engine gear housing according to claim 1, characterized in that: The sealing body (2.3) at the large end of the screw hole protective rubber plug (2) is a large cylinder, and its diameter d3 is 1-2 mm larger than the chamfer of the exposed screw hole LK. A blind hole (2.4) is provided in the middle of the end face of the sealing body (2.3), and its diameter d4 ensures that the wall thickness of the screw hole protective rubber plug is 1.5-4 mm according to the screw hole diameter.

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