JPS6024894Y2 - Crankcase ventilation valve - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a crankcase ventilation valve that reburns engine blow-by gas without releasing it to the outside.

FIG. 1 shows a conventional metal crankcase ventilation valve.

This conventional type consists of a metal body 1, a valve 2, a plate 3', a spring 4, and a cushion spring 5. The right side of the body 1 in the figure is connected to the crankcase of the internal combustion engine, and the left side is the intake pipe. It has a passage connecting to.

In this case, the valve 2 is actuated to the left against the force of the spring 4 due to the intake negative pressure, and a blow-by amount corresponding to the negative pressure is sucked into the intake pipe.

Blow-by measurement at this time is performed by the measuring section 6 of the body 1 and the valve.

It has long been a technical necessity to change the crankcase ventilation valve from metal to resin in order to reduce costs and weight.

However, it was impossible to simply switch from metal to resin because of problems with accuracy and durability.

The present invention aims to provide a resin crankcase ventilation valve that solves this problem.

Next, the embodiment of the present invention shown in FIG. 2 will be explained.

In this embodiment, body 1, valve 2, case 3
, spring 4, cushion spring 5, seat 6,
The outer frame is divided into a body 1 and a case 3, which are made of synthetic resin, and the valve 2 and seat 6 are made of metal.

By forming the seat 6 and the valve 2 from metal in this way, the necessary accuracy and durability of these can be maintained at the same level as before, and the outer frame consisting of the large-volume body 1 and case 3 can be made of synthetic resin. This makes it possible to reduce weight and cost.

In addition, the structure shown in FIG. 2 has a structure in which the seat 6 is sandwiched and fixed at the same time when the body 1 and the case 3 are welded together. , it may be simultaneously molded and fixed to the body 1 when the body 1 is molded.

As described above, in the present invention, since the seat 6 and the valve 2 are made of metal, they can be processed with high precision, so the amount of blow-by gas can be measured with a flow rate with little variation.

Furthermore, since the seat 6 and the valve 2 are metal, there is little wear when they slide, and dimensional accuracy can be maintained over a long period of time, making it possible to provide a durable resin crankcase ventilation valve.

It also has the advantage of being about half the weight of conventional metal ones.

In particular, in the present invention, the seat is fixed to the outer frame by an engagement method that does not move in the axial direction relative to the outer frame, using the engaging portion 6' provided on the seat as a retaining element, so that the outer frame is fixed to the engine. Since the relative positional relationship with the valve does not change even if it expands or contracts under the influence of heat, a high degree of blow-by gas metering accuracy can be ensured over a long period of time.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional view of a conventional crankcase ventilation valve, Fig. 2 is a longitudinal sectional view of one embodiment of the resin crankcase ventilation valve of the present invention, and Fig. 3 is a longitudinal sectional view of another embodiment. It is a front view. 1...Body, 2...Valve, 3...
...Case, 4.5...Spring, 6.
...Sheet.

Claims (1)

[Scope of utility model registration request] The outer frame consisting of the case 3 and the body 1 is made of synthetic resin material, and the valve 2 that functions as a meter and the seat 6 facing the valve are made of metal material. A crankcase ventilation valve characterized by having a retaining portion 6' projecting outward, and using the engaging portion as an engaging element to fix a seat 6 to an outer frame.