JPS6027764Y2 - Installation structure of pipe joint for blow-by gas reduction in internal combustion engine - Google Patents

Description

[Detailed description of the invention] This invention is a pipe joint used to connect the blazer device installed on the valve arm bonnet of an internal combustion engine and the intake manifold.
By attaching the rubber hose so that the connection side thereof can freely turn, the rubber hose can be easily attached to the pipe joint.

In internal combustion engines such as diesel engines, blowby gas containing oil mist is generated inside the crankcase, and a blazer device is used to prevent this from being discharged to the outside of the engine due to the increase in internal pressure when the piston moves up and down. It is equipped with an oil separator called

By the way, as shown in FIGS. 1 and 2, this type of conventional blazer device attached to an internal combustion engine has a cup-shaped main body 3 attached to the top of a bonnet 2 that covers the top surface of the cylinder head 1 of the internal combustion engine. While tightly attaching one end of the rubber hose 5 to the exit vibrator 4 protruding from the blazer device main body 3,
By tightly attaching the other end of the rubber hose 5 to the single-shaped pipe joint 7 fixed to the pipe wall of the intake manifold 6, oil is removed by the blazer device 3, and blow-by gas with a small amount of oil mist remaining is removed. After being introduced into the intake manifold 6 through the rubber hose 5 and used to lubricate the intake valves, it is completely combusted together with the fuel in the cylinder and discharged into the atmosphere to prevent environmental pollution around the engine. However, among the piping connecting the Blazer device 3 and the intake manifold 6, especially the intake manifold 6
As shown in cross section in FIG. 3, the mounting structure of the pipe joint 7 is that a tapered threaded portion 8 is carved on the outer peripheral surface of one end of the single-shaped pipe joint 7, and a through screw hole is formed in the pipe wall of the intake manifold 6. 9, apply adhesive to the threaded part 8 of the pipe joint, and screw it into the threaded hole 9 of the intake manifold 6. Then, attach rubber hoses to the protruding ends of the pipe 4 and the pipe joint 7 on the Blazer device 3 side, respectively. Both ends of 5 are fitted, and hose clips 10 and 10 are used to prevent removal.

However, in such a conventional blow-by gas reduction device, the rubber hose 5 is extremely difficult to prevent from being flattened due to the negative pressure in the intake manifold 6 or to prevent it from swinging greatly due to engine vibrations. It is made of a material with high rigidity, and its length and curvature are set to dimensions that do not cause waste.In particular, since the pipe joint 7 is screwed to the intake manifold 6, both It is unavoidable that variations in the relative fixation angles occur between them, and the fitting directions of the pipe joint 7 and the rubber hose 5 often do not match, making assembly difficult.

The present invention focuses on the problems of installing rubber hoses due to the installation structure of conventional blow-by gas return pipe joints,
This was done to correct and improve this problem, and the blow-by gas discharged from the blazer device installed on the valve arm bonnet of the internal combustion engine is transferred into the intake manifold through a rubber hose and an L-shaped pipe joint connected to the rubber hose. In the pipe joint mounting portion of the blow-by gas reduction device to be introduced into the air, one end of the pipe joint is airtightly and rotatably fitted into a mounting hole drilled in the wall of the intake manifold through an 01J ring. This pipe joint is characterized by a structure in which a retaining ring is fitted onto the distal end side of the fitting portion of the pipe joint.

The specific contents of the present invention will be explained in detail below with reference to the embodiments shown in the attached drawings. FIG. A mounting hole 13 having a predetermined diameter is bored in the pipe wall of the intake manifold 12.

On the other hand, the single-shaped pipe joint 14 is connected to the blazer device 3 by fitting a rubber hose 5 as shown in FIGS. and the other end 14b side is fitted into the mounting hole 13 of the intake manifold 12,
Airtightness is maintained by an O-ring 16 fitted into a groove 15 provided around the outer periphery of the insertion portion of the pipe joint 14.

Further, a retaining ring 18 that is easy to assemble, such as a circlip, is fitted into another circumferential groove 17 carved near the tip of the insertion portion.
and the outer circumferential stepped portion 19 of the pipe joint 14 come into contact with the periphery of the mounting hole 13 of the intake manifold 12 to restrict movement of the pipe joint 14 in the axial direction of the mounting hole 13 and to prevent the rubber hose of the pipe joint 14 from moving in the axial direction of the mounting hole 13. The mounting side is configured so that it can freely rotate around the fitting portion into the intake manifold 12.

The present invention has the construction as described above.Next, we will explain its effect when applied to an internal combustion engine as shown in FIGS. 1 and 2. First, the upper part of the engine's valve arm bonnet After fitting the upper end of the rubber hose 5 to the pipe 4 of the Blazer device 3 provided, the lower end of the rubber hose 5 is fitted to the pipe joint 14 provided on the intake manifold 12, and hose clips 10 are attached to the outer periphery of each fitting part. Attach 10.

At this time, since the pipe joint 14 can freely rotate around the fitting part with the intake manifold 12 and change its direction easily, the pipe joint 14 can be turned in a direction that is easy to insert with one hand, and the rubber hose 5 can be 5 By fitting them together while holding them together, the connection can be made without applying excessive force, and stress will not be applied to the joint between the pipe joint 14 and the rubber hose 5 even after assembly, preventing breakage at that part. etc. can be prevented.

In this way, the blow-by gas from which most of the oil mist has been separated by the Blazer device 3 is transferred to the rubber hose 5 and the pipe joint 14.
The oil in the blow-by gas lubricates the intake valves, and the rest is burned in the cylinders and discharged, thereby preventing pollution around the engine.

As described above, the present invention allows one end of the angled pipe joint to be airtightly and rotatably inserted into the mounting hole drilled in the pipe wall of the intake manifold via an O-ring. By fitting a retaining ring to the tip of the fitting part of the pipe joint, the rubber hose connection end of the pipe joint can be freely rotated, so when connecting the rubber hose to the pipe joint, it is possible to The angle can be changed to an angle that is easy to fit, making it easier to assemble the engine and improving work efficiency.It also prevents unnecessary stress from being applied to the rubber hoses and pipe fittings after assembly, and prevents breakage of the pipe fittings and rubber hoses. Demonstrates excellent prevention effects.

[Brief explanation of the drawing]

Figures 1 and 2 are side and rear views of an internal combustion engine equipped with a conventional blow-by gas reduction device, and Figure 3 is an example of a conventional pipe joint mounting structure, as viewed from the I-I line in Figure 2. 4 is a sectional view showing an embodiment of the pipe joint mounting structure of the present invention. 2...Valve arm bonnet, 3...Blazer device, 5...◆...Rubber hose, 12◆...
Intake manifold, 13...Mounting hole, 14...
...Pipe fitting, 16...01J ring, 18...Removal retaining ring.

Claims (1)

[Scope of utility model registration request] Installation of the pipe joint of a blow-by gas reduction device that introduces blow-by gas discharged from a blazer device provided on a valve arm bonnet of an internal combustion engine into an intake manifold via a rubber hose and an L-shaped pipe joint connected to the rubber hose. In the section, one end of the pipe fitting is fitted airtightly and rotatably into the mounting hole drilled in the wall of the intake manifold via an O-ring, and is pulled out to the distal end side of the fitting part of the pipe fitting. A mounting structure for a pipe joint for blow-by gas return in an internal combustion engine, characterized in that a retaining ring is fitted.