Rotary valve and engine

Abstract

The utility model discloses a rotary valve and an engine, the rotary valve comprises a valve rod, the upper part of the valve rod is sleeved with a valve collet, the inner wall surface of the valve collet is provided with a spherical groove, a steel ball is arranged in the spherical groove, the wall surface of the valve rod is provided with an annular groove, the spherical groove and the annular groove are oppositely arranged, and the valve collet is arranged in the annular groove. When the valve rod rotates, the valve rod rotates in the valve collet, and the steel ball rolls in the annular groove. According to the utility model, the valve rod and the valve collet are correspondingly provided with the annular groove and the spherical groove, so that the valve rod can rotate in the valve collet, and compared with an existing rotating sleeve, sliding friction is converted into rolling friction, eccentric wear of the head of the valve rod is avoided, and further faults of an engine are reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of engines, and in particular relates to a rotary valve and an engine. Background Art

[0002] The statements herein merely provide background art related to the present invention and do not necessarily constitute prior art.

[0003] The valve is responsible for inputting air into the engine and exhausting the exhaust gas after combustion. Due to the high engine speed and the effect of the return spring force, the valve will rotate along its own axis to a certain extent during actual operation, so that the valve wears evenly.

[0004] In the prior art, some rotating mechanisms are usually provided to ensure that the valve can rotate when the engine is working, so that the valve wear is uniform. However, due to the low speed of the low-speed diesel engine, the valve mechanism rotates very little or almost does not rotate during actual operation, so the valve is very prone to eccentric wear, pitting concentration and other problems, which in turn causes a series of engine failures. In the prior art, Chinese utility model patent CN2755291Y discloses a rotary valve device, which is provided with a rotating sleeve at the end of the valve stem to prevent excessive valve wear and valve jamming, but this structure has the following problems: when the valve stem rotates during the rising process, the top end face of the valve stem and the bottom face of the rotating sleeve will move relative to each other, and after the engine has been running for a long time, the head of the valve stem is prone to eccentric wear, and eccentric wear to a certain extent is prone to cause serious problems such as valve leakage and valve ablation. Utility Model Content

[0005] The utility model aims to provide a rotary valve, which can realize the self-rotation of the valve stem in the valve lock clamp, thereby reducing the eccentric wear of the valve stem head and reducing the failure of the engine.

[0006] In order to achieve the above purpose, the utility model is implemented through the following technical solutions:

[0007] In the first aspect, an embodiment of the utility model provides a rotary valve, including a valve stem, a valve lock clamp is sleeved on the upper part of the valve stem, a spherical groove is provided on the inner wall surface of the valve lock clamp, a steel ball is provided in the spherical groove, an annular groove is provided on the wall surface of the valve stem, the spherical groove and the annular groove are arranged opposite to each other, when the valve stem rotates, the valve stem rotates in the valve lock clamp, and the steel ball rolls in the annular groove.

[0008] As a further technical solution, a plurality of spherical grooves are provided, and the plurality of spherical grooves are evenly distributed along the circumferential direction on the inner wall surface of the valve lock clamp.

[0009] As a further technical solution, a valve spring is sleeved on the valve stem, the upper end of the valve spring abuts against the spring upper seat, and the lower end of the valve spring abuts against the spring lower seat.

[0010] As a further technical solution, the spring upper seat sleeve is arranged outside the valve lock clamp.

[0011] As a further technical solution, the valve lock clamp is conical, the outer conical surface of the valve lock clamp is matched with the inner surface of the spring upper seat, and the valve lock clamp is interference fit with the spring upper seat.

[0012] As a further technical solution, the lower part of the spring lower seat is supported on the cylinder head.

[0013] As a further technical solution, a spring limiting boss is provided on both the spring upper seat and the spring lower seat, and the diameter of the spring limiting boss matches the inner diameter of the valve spring.

[0014] As a further technical solution, the top of the valve stem is connected to the rocker arm, and the bottom of the valve stem is fixedly connected to the valve disc.

[0015] As a further technical solution, the valve lock clamp is formed by connecting two lock clamp pieces, and the valve stem is inserted between the two lock clamp pieces.

[0016] In a second aspect, an embodiment of the present invention provides an engine, comprising the rotary valve described in the first aspect.

[0017] The beneficial effects of the above-mentioned embodiments of the utility model are as follows:

[0018] The rotary valve provided by the utility model can realize the self-rotation of the valve stem in the valve lock clamp by arranging corresponding annular grooves and spherical grooves on the valve stem and the valve lock clamp. Compared with the existing rotary sleeve, the sliding friction is converted into rolling friction, thus avoiding eccentric wear of the valve stem head and reducing engine failure.

[0019] In the rotary valve provided by the utility model, the valve locking clamp is formed by butting two locking clamp pieces together, which is convenient for assembly. At the same time, the outer wall surface of the valve locking clamp is set to a conical surface, and the valve locking clamp and the spring upper seat have an interference fit, so that the valve locking clamp and the inner surface of the spring upper seat are completely fitted, and the spring upper seat and the valve locking clamp are locked by the wedging effect of the conical surface, thereby avoiding relative rotation between the valve and the valve locking clamp, which affects the normal operation of the valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention.

[0021] Figure 1 It is a cross-sectional view of the rotary valve of the utility model;

[0022] Figure 2 It is a schematic diagram of the overall structure of the rotary valve of the utility model;

[0023] Figure 3 yes Figure 1 A partial enlarged view of the middle A;

[0024] Figure 4 It is a structural schematic diagram of the valve lock clamp of the utility model;

[0025] Figure 5 It is a structural schematic diagram of the valve stem of the utility model;

[0026] Figure 6 yes Figure 5 A partial enlarged view of point B in the middle.

[0027] The schematic diagram is for illustrative purposes only;

[0028] Among them, 1. valve stem; 101, annular groove; 2. spring upper seat; 3. locking clip; 301, spherical groove; 4. valve spring; 5. spring lower seat; 6. steel ball; 7. valve disc. DETAILED DESCRIPTION

[0029] It should be noted that the following detailed descriptions are exemplary and are intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used in the present invention have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0030] Example 1

[0031] In a typical implementation of the present invention, Figure 1-6 As shown, a rotary valve is provided, including a valve stem 1, a valve lock clamp is sleeved on the upper part of the valve stem 1, a spherical groove 301 is arranged on the inner wall surface of the valve lock clamp, a steel ball 6 is arranged in the spherical groove 301, an annular groove 101 is arranged on the wall surface of the valve stem 1, the spherical groove 301 and the annular groove 101 are arranged opposite to each other, when the valve stem 1 rotates, the valve stem 1 rotates in the valve lock clamp, and the steel ball 6 rolls in the annular groove 101.

[0032] In this embodiment, the valve lock clamp is formed by connecting two lock clamps 3, and the valve stem 1 is inserted between the two lock clamps. The structure of the lock clamp is as follows: Figure 4As shown, the spherical grooves 301 are provided in plurality, and the plurality of spherical grooves 301 are evenly distributed along the circumferential direction on the inner wall surface of the valve lock clip. Further, a conical surface is provided on the top of the inner wall surface of the lock clip 3, and the spherical grooves 301 are provided on the conical surface, so that the opening of the spherical grooves 301 is inclined upward, and the opening of the corresponding annular groove on the valve stem is inclined downward, as shown in FIG. Figure 5 and Figure 6 As shown, the matching structure of the spherical groove 301 on the locking clip 3 and the annular groove on the valve stem 1 is as shown in FIG. Figure 3 shown.

[0033] Furthermore, if Figure 1 and Figure 2 As shown, the valve stem 1 is sleeved with a valve spring 4, the upper end of the valve spring 4 abuts against the spring upper seat 2, and the lower end of the valve spring 4 abuts against the spring lower seat 5. The spring upper seat 2 is sleeved on the outside of the valve locking clamp, and the valve locking clamp is conical, and the outer conical surface of the valve locking clamp is matched with the inner surface of the spring upper seat 2. The valve locking clamp and the spring upper seat 2 are interference fit, so that the spring upper seat and the valve locking clamp are locked by the wedging effect of the conical surface, avoiding relative rotation between the valve stem and the valve locking clamp, which affects the normal operation of the valve.

[0034] In this embodiment, a spring limiting boss is provided on both the spring upper seat 2 and the spring lower seat 5. The diameter of the spring limiting boss matches the inner diameter of the valve spring. The spring limiting boss is provided to limit the valve spring and prevent the valve spring from lateral displacement.

[0035] When in use, the lower part of the spring lower seat 5 is supported on the cylinder head, the top of the valve stem 1 is connected to the rocker arm, and the bottom of the valve stem 1 is fixedly connected to the valve disc 7. When the valve needs to be opened, the rocker arm (not shown) presses the upper part of the valve stem 1 to make the valve stem 1 move downward, and the valve stem 1 drives the steel ball 6, the steel ball 6 drives the valve locking clamp, and the valve locking clamp drives the spring upper seat 2, which move downward together, and the spring upper seat 2 compresses the spring 4.

[0036] When the engine is working, when the piston reciprocates in the cylinder of the engine, it will drive the air flow in the cylinder to rotate in a certain direction. The air flow drives the valve stem 1 to rotate relative to the steel ball 6. The valve stem can rotate in the valve lock clamp, avoiding eccentric wear of the valve stem head. At the same time, there is splashing lubricating oil between the valve, the steel ball and the valve lock clamp, which can play a lubricating role.

[0037] Example 2

[0038] In a typical embodiment of the present invention, an engine is provided, comprising the rotary valve described in Example 1.

[0039] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A rotary valve, characterized in that: The invention comprises a valve stem (1), wherein a valve lock clamp is sleeved on the upper part of the valve stem (1), a spherical groove (301) is arranged on the inner wall surface of the valve lock clamp, a steel ball (6) is arranged in the spherical groove (301), an annular groove (101) is arranged on the wall surface of the valve stem (1), the spherical groove (301) and the annular groove (101) are arranged opposite to each other, and when the valve stem (1) rotates, the valve stem (1) rotates in the valve lock clamp, and the steel ball (6) rolls in the annular groove (101).

2. The rotary valve according to claim 1, characterized in that A plurality of spherical grooves (301) are provided, and the plurality of spherical grooves (301) are evenly distributed along the circumferential direction on the inner wall surface of the valve lock clamp.

3. The rotary valve according to claim 1, characterized in that: The valve stem (1) is sleeved with a valve spring (4), the upper end of the valve spring (4) abuts against the spring upper seat (2), and the lower end of the valve spring (4) abuts against the spring lower seat (5).

4. The rotary valve according to claim 3, characterized in that: The spring upper seat (2) is sleeved on the outside of the valve lock clamp.

5. The rotary valve according to claim 4, characterized in that: The valve lock clamp is conical, the outer conical surface of the valve lock clamp is matched with the inner surface of the spring upper seat (2), and the valve lock clamp and the spring upper seat (2) are interference fit.

6. The rotary valve according to claim 3, characterized in that: The lower part of the spring lower seat (5) is supported on the cylinder head.

7. The rotary valve according to claim 3, characterized in that: The spring upper seat (2) and the spring lower seat (5) are both provided with a spring limiting boss, and the diameter of the spring limiting boss matches the inner diameter of the valve spring (4).

8. The rotary valve according to claim 1, characterized in that The top of the valve stem (1) is connected to the rocker arm, and the bottom of the valve stem (1) is fixedly connected to the valve disc (7).

9. The rotary valve according to claim 1, characterized in that: The valve lock clamp is formed by butting two lock clamp pieces (3), and the valve stem (1) is inserted between the two lock clamp pieces.

10. An engine, characterized in that: Comprising a rotary valve as described in any one of claims 1-9.

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