An installation assisting device for a diesel engine valve guide

Abstract

An auxiliary device for installing a diesel engine valve guide sleeve includes a guide rod with a stepped shaft structure. The guide rod comprises an integrally connected guide section, a positioning section, a threaded section, and a smooth section. The guide rod passes through the valve guide sleeve from bottom to top. The guide section forms a lower limit on the valve guide sleeve. A gasket is provided above the valve guide sleeve, and an upper limit is formed by a locking nut. The valve guide sleeve is located outside the positioning section. A rubber ring is provided on the outer circumference of the positioning section, and the outer side of the rubber ring abuts against the inner wall of the valve guide sleeve. The lower part of the guide section is machined into a tapered guide surface. The guide rod is aligned with the through hole of the cylinder head and pressed down, causing the guide rod to drive the valve guide sleeve into the through hole. In this device, the valve guide sleeve is fitted onto the guide rod. The guide section at the bottom of the guide rod first extends into the through hole of the cylinder head for guidance, and then drives the valve guide sleeve into the through hole to form an interference fit, ensuring that the central axis of the valve guide sleeve coincides with the central axis of the through hole, thus improving assembly accuracy.

Description

Technical Field

[0001] This utility model relates to an auxiliary device for installing a diesel engine valve guide sleeve. Background Technology

[0002] Diesel generators are an indispensable power source for marine navigation equipment. Ships typically have multiple diesel generators, each with six cylinder heads, and each cylinder head has four valve guide sleeves. The valve guide sleeves are primarily used for guiding the valve stems and need to be replaced after wear. The valve guide sleeves and cylinder heads have an interference fit, making installation and disassembly difficult. Current installation methods often involve manually hammering the valve guide sleeves into the through-holes in the cylinder heads. Because the valve guide sleeves lack guiding components, positioning is inconvenient. Furthermore, the outer diameter of the valve guide sleeve is larger than the through-hole used for assembly, and during hammering, the center of the valve guide sleeve is prone to shifting, compromising assembly accuracy and affecting the overall operation of the generator. Utility Model Content

[0003] To address the shortcomings mentioned above, this utility model provides an auxiliary device for installing a diesel engine valve guide sleeve.

[0004] To achieve the above objectives, this utility model provides an auxiliary device for installing a diesel engine valve guide sleeve, including a guide rod. The guide rod has a stepped shaft structure and includes an integrally connected guide section, positioning section, threaded section, and smooth section. The guide rod passes through the valve guide sleeve from bottom to top. The guide section forms a lower limit on the valve guide sleeve. A gasket is provided above the valve guide sleeve, and an upper limit is formed by a locking nut. The valve guide sleeve is located outside the positioning section. A rubber ring is provided on the outer circumference of the positioning section. The outer side of the rubber ring abuts against the inner wall of the valve guide sleeve. The lower part of the guide section is machined into a tapered guide surface. The guide rod is aligned with the through hole of the cylinder head and pressed down. The guide rod drives the valve guide sleeve to extend into the through hole to form an interference fit until the convex edge of the valve guide sleeve is fitted into the stepped part of the upper part of the through hole.

[0005] As a further improvement of this utility model, the outer diameter of the guide section is consistent with the inner diameter of the through hole.

[0006] As a further improvement of this utility model, the outer diameter of the positioning section is smaller than the inner diameter of the air valve guide sleeve.

[0007] As a further improvement of this utility model, an annular groove is machined along the circumferential direction on the outer peripheral surface of the positioning section. The annular groove is evenly distributed along the length direction of the positioning section. The rubber ring is disposed in the annular groove, and the cross-sectional diameter of the rubber ring is greater than the depth of the annular groove.

[0008] As a further improvement of this utility model, the outer diameter of the smooth rod section is smaller than the minor diameter of the threaded section, and the outer diameter of the positioning section is not smaller than the major diameter of the threaded section.

[0009] As a further improvement of this utility model, the gasket is made of copper.

[0010] The beneficial effects of this utility model are as follows:

[0011] In this device, the valve guide sleeve is fitted onto the guide rod. The guide section at the bottom of the guide rod first extends into the through hole of the cylinder head for guidance, and then drives the valve guide sleeve into the through hole to form an interference fit, ensuring that the central axis of the valve guide sleeve coincides with the central axis of the through hole, thus improving assembly accuracy. A rubber ring is embedded on the outer circumference of the positioning section in the middle of the guide rod. The rubber ring abuts against the inner wall of the valve guide sleeve, avoiding scratches caused by direct contact between the outer wall of the positioning section and the valve guide sleeve. Attached Figure Description

[0012] Figure 1 This is a front view of an auxiliary device for installing a diesel engine valve guide sleeve according to the present invention.

[0013] Figure 2 This is a schematic diagram of the guide rod 3;

[0014] Figure 3 This is a schematic diagram illustrating the operation of an auxiliary device for installing a diesel engine valve guide sleeve according to this utility model. Figure 1 ;

[0015] Figure 4 This is a schematic diagram illustrating the operation of an auxiliary device for installing a diesel engine valve guide sleeve according to this utility model. Figure 2 ;

[0016] Figure 5 This is a schematic diagram of the completed assembly of the air valve guide.

[0017] In the diagram: 1. Cylinder head; 11. Through hole; 12. Stepped section; 2. Valve guide sleeve; 21. Raised edge; 3. Guide rod; 31. Guide section; 311. Conical guide surface; 32. Positioning section; 33. Annular groove; 34. Threaded section; 35. Smooth rod section; 4. Rubber ring; 5. Gasket; 6. Lock nut. Detailed Implementation

[0018] like Figure 1 As shown, the auxiliary device for installing a diesel engine valve guide sleeve according to this utility model includes a guide rod 3. The guide rod 3 has a stepped shaft structure and includes an integrally connected guide section 31, a positioning section 32, a threaded section 34, and a smooth rod section 35 (see...). Figure 2The outer diameter of the smooth rod section 35 is smaller than the minor diameter of the threaded section 34, and the outer diameter of the positioning section 32 is not smaller than the major diameter of the threaded section 34. The guide rod 3 passes through the valve guide sleeve 2 from bottom to top. The guide section 31 forms a lower limit on the valve guide sleeve 2. A gasket 5 is provided above the valve guide sleeve 2 and forms an upper limit through a locking nut 6. The gasket 5 is made of copper. The valve guide sleeve 2 is located outside the positioning section 32. The outer diameter of the positioning section 32 is smaller than the inner diameter of the valve guide sleeve 2. A rubber ring 4 is provided on the outer circumference of the positioning section 32. The outer side of the rubber ring 4 abuts against the inner wall of the valve guide sleeve 2. An annular groove 33 is machined along the circumferential direction on the surface. The annular groove 33 is evenly distributed along the length of the positioning section 32. The rubber ring 4 is placed in the annular groove 33. The cross-sectional diameter of the rubber ring 4 is greater than the depth of the annular groove 33. The lower part of the guide section 31 is machined into a conical guide surface 311. The guide rod 3 is aligned with the through hole 11 of the cylinder head 1 and pressed down. The outer diameter of the guide section 31 is consistent with the inner diameter of the through hole 11. The guide rod 3 drives the valve guide sleeve 2 to extend into the through hole 11 to form an interference fit until the protruding edge 21 of the valve guide sleeve 2 fits into the step portion 12 on the upper part of the through hole 11.

[0019] In this device, the valve guide sleeve is fitted onto the guide rod. The guide section at the bottom of the guide rod first extends into the through hole of the cylinder head for guidance, and then drives the valve guide sleeve into the through hole to form an interference fit, ensuring that the central axis of the valve guide sleeve coincides with the central axis of the through hole, thus improving assembly accuracy. A rubber ring is embedded on the outer circumference of the positioning section in the middle of the guide rod. The rubber ring abuts against the inner wall of the valve guide sleeve, avoiding scratches caused by direct contact between the outer wall of the positioning section and the valve guide sleeve.

[0020] In practical use, for ease of understanding of this utility model, it will be described in conjunction with the accompanying drawings;

[0021] During operation, first position the valve guide sleeve on the guide rod. The guide rod passes through the valve guide sleeve from bottom to top, with the valve guide sleeve located outside the positioning section of the guide rod. The rubber ring on the positioning section abuts against the inner wall of the valve guide sleeve. After placing a copper washer on top of the valve guide sleeve, it is then tightened with a lock nut. The lower end of the valve guide sleeve rests against the upper edge of the guide section. After positioning, align the lower guide section of the guide rod with the through hole in the cylinder head. Then, apply downward pressure to the upper smooth section of the guide rod, causing the guide section to extend into the through hole (see...). Figure 3 The outer diameter of the guide section matches the inner diameter of the through hole, ensuring that the center of the guide rod aligns with the center of the through hole. When the lower edge of the valve guide sleeve moves to the upper edge of the through hole, the locking nut, through the washer, exerts a downward thrust, pushing the valve guide sleeve into the through hole and forming an interference fit, until the protruding edge of the valve guide sleeve is embedded into the stepped portion at the top of the through hole (see...). Figure 4During the process of the valve guide sleeve extending into the through hole, the guide section always guides from below, so that the center of the valve guide sleeve will not shift, thus ensuring assembly accuracy. After assembly, remove the locking bolts and gaskets, and then pull out the guide rod as a whole from below the valve guide sleeve.

[0022] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. An installation aid for a diesel valve guide, characterised in that: Includes a guide rod (3), which has a stepped shaft structure. The guide rod (3) includes an integrally connected guide section (31), a positioning section (32), a threaded section (34), and a smooth section (35). The guide rod (3) passes through the valve guide sleeve (2) from bottom to top. The guide section (31) forms a lower limit on the valve guide sleeve (2). A gasket (5) is provided above the valve guide sleeve (2), and an upper limit is formed by a locking nut (6). The valve guide sleeve (2) is located outside the positioning section (32). A rubber ring (4) is provided on the outer circumference of the positioning section (32). The outer side of the rubber ring (4) abuts against the inner wall of the valve guide sleeve (2). The lower part of the guide section (31) is machined into a tapered guide surface (311). The guide rod (3) is aligned with the through hole (11) of the cylinder head (1) and pressed down. The guide rod (3) drives the valve guide sleeve (2) to extend into the through hole (11) to form an interference fit until the protruding edge (21) of the valve guide sleeve (2) is fitted into the step portion (12) on the upper part of the through hole (11).

2. An installation aid for a valve guide of a diesel engine according to claim 1, characterized in that: The outer diameter of the guide section (31) is the same as the inner diameter of the through hole (11).

3. The installation aid for a valve guide of a diesel engine according to claim 1, characterized in that: The outer diameter of the positioning section (32) is smaller than the inner diameter of the air valve guide sleeve (2).

4. The installation aid for a valve guide of a diesel engine according to claim 1, characterized in that: An annular groove (33) is machined along the circumferential direction on the outer circumferential surface of the positioning section (32). The annular groove (33) is evenly distributed along the length direction of the positioning section (32). The rubber ring (4) is located in the annular groove (33). The cross-sectional diameter of the rubber ring (4) is greater than the depth of the annular groove (33).

5. The installation aid for a valve guide of a diesel engine according to claim 1, characterized in that: The outer diameter of the smooth rod section (35) is smaller than the minor diameter of the threaded section (34), and the outer diameter of the positioning section (32) is not smaller than the major diameter of the threaded section (34).

6. The auxiliary device for installing a diesel engine valve guide sleeve according to claim 1, characterized in that: The gasket (5) is made of copper.

Images