CN209761525U

CN209761525U - Anti-disassembly structure of PCV valve

Info

Publication number: CN209761525U
Application number: CN201920389112.9U
Authority: CN
Inventors: 田身军; 李德银; 项大伟; 朱斌; 慕金华
Original assignee: SAIC Chery Automobile Co Ltd
Current assignee: Chery Automobile Co Ltd
Priority date: 2019-03-26
Filing date: 2019-03-26
Publication date: 2019-12-10
Anticipated expiration: 2029-03-26

Abstract

The utility model aims at providing a can guarantee that PCV valve assembles not detachable PCV valve's anti-disassembly structure behind the valve chamber shroud, including the valve chamber shroud, PCV valve installs in the mounting hole on the valve chamber shroud, and the drill way department lid of mounting hole is equipped with the valve gap, and the outside valve chamber of mounting hole is covered and is provided with to enclose and keep off. After the valve cover is assembled, due to the arrangement of the enclosing block, a disassembling tool cannot extend into the joint of the valve cover and the mounting hole and can be disassembled only after the enclosing block (the valve chamber cover) is damaged, so that the requirement that the connection between the disconnecting valve and the crankcase is obviously more difficult than the connection between the PCV valve and the intake manifold, which is explained in the laws and regulations, is met. The structure only relates to local slight modification of the valve chamber cover die, and has the advantages of low cost, simple process, small influence on related parts and the like.

Description

Anti-disassembly structure of PCV valve

Technical Field

the utility model relates to an automobile engine technical field, concretely relates to PCV valve's anti-disassembly structure.

Background

In the operation of the piston type internal combustion engine, since a certain gap is formed between the piston ring and the cylinder tube, gas in the cylinder tube is blown into the crankcase, but since the blow-by gas contains unburned Hydrocarbon (HC), carbon monoxide (CO), and the like, which are main substances causing air pollution, the blow-by gas cannot be discharged into the atmosphere, and a PCV (positive crankcase ventilation) system is generally used in which the blow-by gas is returned to the intake system and is re-combusted together with a mixed gas. However, since the engine function is degraded if the amount of blow-by gas returned to the intake system increases, a PCV valve for adjusting the blow-by gas flow rate needs to be provided.

As shown in fig. 1 and 2, a conventional PCV valve is generally integrated on a valve chamber cover or an oil-gas separation module 1, and the PCV valve generally comprises a diaphragm, a bracket, a spring, a valve cover 2 and other parts, wherein the diaphragm, the bracket and the spring can be mounted on the valve chamber cover 1 by the valve cover 2 through a snap-fit structure, and when the diaphragm is broken or the spring is stuck, the valve cover 2 can be pried open by using a general tool such as a screwdriver for maintenance or replacement. However, this structure has not been able to accommodate the legislation which has put new demands: GB 18352.6-2016-J.4.9 specifies: the connection relationship of the PCV valve and the crankcase satisfies the following conditions: I) can prevent aging or accidental disconnection; II) disconnecting the connection between the valve and the crankcase is significantly more difficult than disconnecting the PCV valve from the intake manifold; III) maintenance work on non-PCV systems in a manufacturing facility does not involve disconnection. Because the existing PCV valve is connected with the valve chamber cover by utilizing a buckling structure, the assembled PCV valve can be disassembled by a common tool such as a screwdriver, and the PCV valve can be repeatedly assembled and used, the connection mode does not meet the requirements of new regulations.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a can guarantee that PCV valve assembles not detachable PCV valve's side dismantlement structure behind the valve chamber shroud.

In order to realize the purpose, the utility model discloses a technical scheme be: the utility model provides an anti-disassembly structure of PCV valve, includes the valve chamber shroud, and the PCV valve is installed in the mounting hole on the valve chamber shroud, and the drill way department lid of mounting hole is equipped with the valve gap, and the outside valve chamber of mounting hole covers to be provided with on and encloses the fender.

In the scheme, after the valve cover is assembled, due to the arrangement of the enclosing block, the disassembling tool cannot extend into the joint of the valve cover and the mounting hole and can only be disassembled after the enclosing block (the valve chamber cover) is damaged, so that the requirement that the connection between the disconnecting valve and the crankcase is obviously more difficult than the connection between the PCV valve and the intake manifold, which is explained in the laws and regulations, is met. The structure only relates to local slight modification of the valve chamber cover die, and has the advantages of low cost, simple process, small influence on related parts and the like.

Drawings

FIG. 1 is a schematic illustration of an assembly of a prior art PCV valve;

FIG. 2 is a cross-sectional view of FIG. 1;

Fig. 3 and 4 are schematic assembly views of a PCV valve according to the present invention;

fig. 5 is a cross-sectional view of fig. 3.

Detailed Description

Referring to fig. 3 to 5, the disassembly prevention structure of the PCV valve includes a valve chamber cover 10, the PCV valve is installed in a mounting hole on the valve chamber cover 10, a valve cover 20 covers an opening of the mounting hole, and a baffle 30 is arranged on the valve chamber cover 10 outside the mounting hole. After the valve cover 20 is assembled, due to the arrangement of the enclosure 30, a disassembling tool cannot extend into the joint of the valve cover 20 and the mounting hole, and can only be disassembled after the enclosure 30 (valve chamber cover) is damaged, so that the requirement that the connection between the disconnecting valve and the crankcase is obviously more difficult than the connection between the PCV valve and the intake manifold, which is explained in the laws and regulations, is met. The structure only relates to local slight modification of the valve chamber cover die, and has the advantages of low cost, simple process, small influence on related parts and the like.

As the preferred embodiment of the present invention, the baffle 30 is a baffle continuously arranged in the circumferential direction, and the surface of the baffle is perpendicular to the surface of the valve chamber cover 10.

In view of the requirement of light weight, the second preferred embodiment of the present invention is a baffle plate with the baffle 30 arranged at intervals in the circumferential direction, and the surface of the baffle plate is perpendicular to the surface of the valve chamber cover 10.

Further, the orifice of the mounting hole of the valve chamber cover 10 protrudes outwards to form a short pipe, the valve cover 20 is clamped with the outer wall of the short pipe through a buckle, in order to ensure that the disassembling tool cannot touch the clamping part, the top of the baffle is higher than the height of the buckle matching part, and the distance from the baffle to the valve cover 20 is smaller than the distance required by the buckle to be separated on the premise of meeting the requirement of assembly.

To ensure strength, the thickness a of the baffle is greater than 2 mm.

Claims

1. The utility model provides an anti-disassembly structure of PCV valve, includes valve chamber shroud (10), and the PCV valve is installed in the mounting hole on valve chamber shroud (10), and the drill way department lid of mounting hole is equipped with valve gap (20), its characterized in that: and a valve chamber cover (10) outside the mounting hole is provided with a baffle (30).

2. The disassembly preventing structure of the PCV valve according to claim 1, wherein: the baffle (30) is a baffle continuously arranged in the circumferential direction, and the plate surface of the baffle is perpendicular to the plate surface of the valve chamber cover (10).

3. The disassembly preventing structure of the PCV valve according to claim 1, wherein: the baffles (30) are arranged at intervals in the circumferential direction, and the plate surfaces of the baffles are perpendicular to the plate surface of the valve chamber cover (10).

4. The disassembly preventing structure of the PCV valve according to claim 2 or 3, wherein: the orifice of the mounting hole of the valve chamber cover (10) is provided with a short pipe which protrudes outwards, the valve cover (20) is clamped with the outer wall of the short pipe through a buckle, the top of the baffle is higher than the height of the buckle matching part, and the distance from the baffle to the valve cover (20) is less than the distance required by the buckle to be separated.

5. the disassembly preventing structure of the PCV valve according to claim 2 or 3, wherein: the thickness A of the baffle is larger than 2 mm.