CN108868940B

CN108868940B - Valve guide pipe of internal combustion engine

Info

Publication number: CN108868940B
Application number: CN201810939298.0A
Authority: CN
Inventors: 尤建国
Original assignee: Quanjiao Power Machinery Co ltd
Current assignee: Quanjiao Power Machinery Co ltd
Priority date: 2018-08-17
Filing date: 2018-08-17
Publication date: 2021-03-02
Anticipated expiration: 2038-08-17
Also published as: CN108868940A

Abstract

The invention discloses an internal combustion engine valve guide pipe which comprises a cylinder cover, wherein a blind hole is formed in the cylinder cover, a through hole is formed in the bottom of the blind hole, a guide pipe body is arranged in the through hole, the guide pipe body and the through hole are in over fit, a fixing assembly is arranged in the blind hole, the inner wall of the fixing assembly and the guide pipe body are in over fit, the fixing assembly comprises a pressing sleeve and a locking sleeve, a first chamfer inclined surface is arranged at the inner opening of the lower end of the pressing sleeve, the first chamfer inclined surface is attached to a second chamfer inclined surface at the upper end of the locking sleeve, a plurality of pressing heads are formed by separating a rectangular groove of the locking sleeve, the pressing sleeve is in threaded connection with the blind hole, and the locking sleeve is movably connected with the blind. The guide pipe body and the cylinder cover are in over fit, then the guide pipe body is clamped through the fixing assembly, and the guide pipe body can be disassembled by reversely screwing out the pressing sleeve.

Description

Valve guide pipe of internal combustion engine

Technical Field

The invention relates to the technical field of internal combustion engines, in particular to an internal combustion engine valve guide pipe.

Background

The valve guide pipe has the function of guiding the motion of the valve, so that the valve is ensured to do linear reciprocating motion, and the valve can be correctly attached to a valve seat or a valve seat ring. The valve guide pipe has higher working temperature and poorer lubricating condition, and the valve rod and the valve guide pipe hole are lubricated by engine oil splashed when the valve mechanism works. The current valve guide pipe generally adopts interference fit installation, heats the cylinder head when the installation promptly earlier, and the inflation grow of mounting hole diameter then pushes up the valve guide pipe into, because the lubricated condition of valve guide pipe is relatively poor, is the vulnerable part, dismantles the valve guide pipe very inconvenient when the maintenance is changed.

Disclosure of Invention

The present invention is directed to a valve guide for an internal combustion engine to solve the problems set forth in the background art.

In order to achieve the purpose, the invention provides the following technical scheme: the utility model provides an internal-combustion engine valve guide pipe, includes the cylinder head, be equipped with the blind hole on the cylinder head, the bottom of blind hole is equipped with the through-hole, install the pipe body in the through-hole, be excessive cooperation between pipe body and the through-hole, install fixed subassembly in the blind hole, be excessive cooperation between fixed subassembly's inner wall and the pipe body, fixed subassembly is including pressing cover and lock sleeve, the lower extreme internal orifice of pressing the cover is equipped with first chamfer inclined plane, the laminating of first chamfer inclined plane and the second chamfer inclined plane of lock sleeve upper end, the rectangular channel of lock sleeve separately forms a plurality of pressure head, be threaded connection between pressing cover and the blind hole, be swing joint between lock sleeve and the blind hole.

Preferably, the through hole and the blind hole are coaxial, the size of the blind hole is 1.3-1.7 times that of the through hole, and threads are arranged on the inner wall of the blind hole.

Preferably, the guide pipe body is provided with a limiting ring, the limiting ring is attached to the upper end face of the fixing assembly, and the distance from the lower end face of the guide pipe body to the cylinder cover is 3-5 mm.

Preferably, the inner diameters of the locking sleeve and the pressing sleeve are equal, and the outer diameter of the locking sleeve is smaller than the outer diameter of the pressing sleeve by 0.1-0.2 mm.

Preferably, the upper end of the pressing sleeve is provided with a hexagonal nut, and the hexagonal nut and the pressing sleeve are integrally formed.

Compared with the prior art, the invention has the beneficial effects that: the guide pipe body and the cylinder cover are in over fit, then the guide pipe body is clamped through the fixing assembly, when the guide pipe body is clamped, the pressing sleeve is rotated to enable the first chamfer inclined plane to extrude the second chamfer inclined plane, the pressing head is enabled to contract inwards to clamp the guide pipe body in a centering mode, and the pressing sleeve is reversely screwed out to disassemble the guide pipe body, so that the guide pipe is convenient to install and disassemble.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic view of an exploded structure of the fixing assembly of the present invention;

fig. 3 is a schematic sectional view of the fixing assembly of the present invention.

In the figure: the guide pipe comprises a cylinder cover 1, a guide pipe body 2, a through hole 3, a blind hole 4, a fixing component 5, a pressing sleeve 51, a locking sleeve 52, a hexagonal nut 53, a first chamfer inclined plane 54, a second chamfer inclined plane 55, a rectangular groove 56, a pressure head 57 and a limiting ring 6.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1-3, the present invention provides a technical solution: a valve guide pipe of an internal combustion engine comprises a cylinder cover 1, a blind hole 4 is arranged on the cylinder cover 1, a through hole 3 is arranged at the bottom of the blind hole 4, the through hole 3 is internally provided with a conduit body 2, the conduit body 2 is in over fit with the through hole 3, a fixed component 5 is arranged in the blind hole 4, the inner wall of the fixed component 5 is in over fit with the catheter body 2, the fixing component 5 comprises a pressing sleeve 51 and a locking sleeve 52, a lower end inner opening of the pressing sleeve 51 is provided with a first chamfer inclined surface 54, the first chamfer inclined surface 54 is attached to a second chamfer inclined surface 55 at the upper end of the locking sleeve 52, a plurality of pressure heads 57 are formed by separating a rectangular groove 56 of the locking sleeve 52, the pressing sleeve 51 is in threaded connection with the blind hole 4, the locking sleeve 52 is movably connected with the blind hole 4, the locking sleeve 52 is made of low alloy steel Q345, and the elastic deformation of the pressure head 57 can be recovered.

Specifically, the through hole 3 and the blind hole 4 are coaxial, the size of the blind hole 4 is 1.4-1.7 times that of the through hole 3, and threads are arranged on the inner wall of the blind hole 4.

Specifically, be equipped with spacing ring 6 on the pipe body 2, spacing ring 6 and the laminating of the up end of fixed subassembly 5, the interval of the lower terminal surface of pipe body 2 to cylinder head 1 is 3 ~ 5mm, pipe body 2 uses nodular cast iron to make, utilizes nodular cast iron's self-lubricity can prolong pipe body 2's life, pipe body 2 can not stretch out the overlength, otherwise increases the valve resistance of admitting air.

Specifically, the inner diameters of the locking sleeve 52 and the pressing sleeve 51 are equal, and the outer diameter of the locking sleeve 52 is 0.1-0.2 mm smaller than the outer diameter of the pressing sleeve 51, so that the locking sleeve 52 can be conveniently placed at the bottom of the blind hole 4.

Specifically, the upper end of the pressing sleeve 51 is provided with a hexagonal nut 53, the hexagonal nut 53 and the pressing sleeve 51 are integrally formed, and the hexagonal nut 53 is used for screwing the pressing sleeve 51 into the blind hole 4.

The working principle is as follows: during installation, the locking sleeve 52 is placed in the blind hole 4 in the cylinder cover 1, clearance fit is formed between the locking sleeve 52 and the blind hole 4, installation is facilitated, the pressing sleeve 51 is screwed in the blind hole 4, the pressing sleeve 51 cannot be screwed, the guide pipe body 2 penetrates through the pressing sleeve 51 and the locking sleeve 52 when the guide pipe body 2 is installed, clearance fit is adopted between the guide pipe body 2 and the fixing component 5, and the guide pipe body can be easily knocked in by a hammer. The pressing sleeve 51 is screwed through the hexagonal nut 53, the pressing sleeve 51 moves downwards for a small distance in the screwing process, and the first chamfer inclined plane 54 extrudes the second chamfer inclined plane 55, so that the pressing head 57 contracts inwards to perform centering clamping on the catheter body 2, and the sliding is prevented from occurring in the using process. The reverse screwing-out of the pressing sleeve 51 can disassemble the catheter body 2, so the invention is convenient to assemble and disassemble.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. An internal combustion engine valve guide comprising a cylinder head (1), characterized in that: the cylinder cover is characterized in that a blind hole (4) is formed in the cylinder cover (1), a through hole (3) is formed in the bottom of the blind hole (4), a guide pipe body (2) is installed in the through hole (3), the guide pipe body (2) is excessively matched with the through hole (3), a fixing component (5) is installed in the blind hole (4), the inner wall of the fixing component (5) is excessively matched with the guide pipe body (2), a limiting ring (6) is arranged on the guide pipe body (2), the limiting ring (6) is attached to the upper end face of the fixing component (5), the distance from the lower end face of the guide pipe body (2) to the cylinder cover (1) is 3-5 mm, the fixing component (5) comprises a pressing sleeve (51) and a locking sleeve (52), a hexagonal nut (53) is arranged at the upper end of the pressing sleeve (51), and the hexagonal nut (53) and the pressing sleeve (51) are integrally formed, the lower extreme internal orifice of pressing cover (51) is equipped with first chamfer inclined plane (54), first chamfer inclined plane (54) laminates with second chamfer inclined plane (55) of lock sleeve (52) upper end, rectangular channel (56) of lock sleeve (52) separately form a plurality of pressure head (57), be threaded connection between pressing cover (51) and blind hole (4), be swing joint between lock sleeve (52) and blind hole (4).

2. An internal combustion engine valve guide as claimed in claim 1, wherein: the through hole (3) and the blind hole (4) are coaxial, the size of the blind hole (4) is 1.4-1.7 times that of the through hole (3), and threads are arranged on the inner wall of the blind hole (4).

3. An internal combustion engine valve guide as claimed in claim 1, wherein: the inner diameters of the locking sleeve (52) and the pressing sleeve (51) are equal, and the outer diameter of the locking sleeve (52) is 0.1-0.2 mm smaller than the outer diameter of the pressing sleeve (51).