JP4708837B2 - Oil jet - Google Patents

Description

  The present invention relates to an oil jet for cooling a piston used in an engine of an automobile or the like. In particular, in an oil jet having an oil supply pipe, the component structure is simplified and the valve function is realized in a space-saving manner, and the piston is always cooled. The present invention relates to functional parts that are greatly involved in improving fuel efficiency through effects.

The need to improve fuel economy in engines such as automobiles is not only a request from environmental administration such as prevention of global warming and exhaust gas regulations, but also a technical mission of the entire automobile industry aiming at harmony with the natural environment. In order to improve fuel efficiency efficiently, it is effective to raise the temperature of the combustion gas, but for that purpose, it is a technical problem to ensure the heat resistance of each member surrounding the combustion chamber. (Figure 1)
In particular, regarding the heat resistance of the piston ring 8 or the like that seals the gap between the cylinder 10 and the piston 12, it is known that effective cooling of the piston 12 with engine oil at all times leads to a great effect. Piston cooling oil jet is adopted.

The composition of the oil jet product is as follows. (Figure 2)
First, an opening 1b and a seat surface 1a connected to the opening 1b are formed on the upper portion of the body 1 containing the spring 3 and the ball 4 related to the valve function, and the check valve function is assembled.
Next, in order to prevent the spring 3 from collapsing and to limit the separation of the ball from the seat surface 1a when the valve is opened, the ball stopper 5 is caulked and fixed at the opening end of the lower part of the body.
Further, an oil supply pipe 2a having an oil jet port 2b is inserted into a lateral hole formed in the side surface of the body and integrated by brazing.
Finally, the bracket 6 is brazed to the outer periphery of the body in order to fix the oil jet inside the engine. With such a configuration, the engine oil flows above the opening 1b of the seat surface 1a at the upper part of the body at a certain valve opening pressure or higher, and the ball 4 and the spring 3 arranged to perform the valve function inside the body. It passes through the side surface, is sent from the side hole to the oil supply pipe 2a, and is ejected from the oil ejection port 2b toward the piston.

The body 1 that is the main body of the oil jet that cools the piston ring 8 and the like through the oil supply pipe 2 a is usually fixed to the ceiling portion of the engine room 15 below the cylinder hole 11 with a bracket 6 brazed to the body 1. The
Further, in order to maintain the relationship between the cylinder hole 11 and the mounting position of the oil jet, the body 1 and the bracket 6 are aligned with the hexagonal hole, and at the same time, a lateral hole is formed at a predetermined angular position on the outer peripheral surface of the body to form an oil supply pipe. 2a is fixed by brazing.
For this reason, it is necessary to change the dimensional shape of the oil jet product for each engine to which the oil jet is to be attached.

In this way, current oil jet products have a large number of parts and a complicated assembly process, resulting in high manufacturing costs. As a result, oil for promoting fuel efficiency improvement in promoting environmental measures. The adoption of jet products has made little progress.

In the above-mentioned product situation, while eliminating the high-cost brazing and simplifying the structure by integrating the parts and simplifying the parts production and parts assembly process, it is possible to save space in various engines. Invented a new oil jet product that can be used in common.

The following items can be listed as invention elements enabling the present invention. (FIGS. 3 and 4)
First, the nozzle 2 has a spring holder portion 2e, an oil supply pipe 2a, and an oil outlet 2b that are integrally formed from a single material.
Second, in the drawing process of the nozzle 2, the oil outlet 2b and the oil supply pipe 2a are formed, and the ball receiving seat surface 2c and the spring receiving seat surface 2d for stabilizing the valve function are formed. The oil supply pipe 2a is bent into a predetermined shape.
Third, when the spring holder portion 2e of the nozzle 2 is press-fitted into the body portion of the body 1, the cross-sectional shape can be maintained. Fourthly, as a method of fixing the bracket 6 to the body 1, a caulking process is adopted instead of brazing to simplify the assembly.

When press-fitting the spring holder portion 2e of the nozzle 2 into the body portion of the body 1, it is necessary to satisfy the requirements of three items.
That is, in order to prevent the falling load from the body 1 after the press-fitting is sufficiently large, dispose the ball receiving surface (ball stopper function) 2c at a certain distance from the seat surface 1a, and finally prevent the spring 3 from falling down. The spring storage space and the spring receiving seat surface 2d are created.
The present invention devised that a petal-like press-fitting shape is imparted to the opening end of the spring holder portion 2e as a moldable shape that satisfies such requirements.

The oil jet of the present invention was integrated by press-fitting a nozzle 2 having a spring holder portion 2e, an oil supply pipe 2a, and an oil outlet 2b into the body portion of the body 1.
As a result, the ball stopper is eliminated, and the caulking process of the ball stopper and the brazing process of the oil supply pipe 2a are not necessary, and are replaced with a press-fitting process. Further, the brazing of the bracket 6 to the outer peripheral portion of the body 1 is eliminated, and the productivity can be improved by caulking instead.
Since the angular positional relationship of the assembly of the bracket 6 and the nozzle 2 and the body 1 can be changed at the time of caulking and press fitting, the positional relationship between the cylinder hole 11 and the oil jet mounting portion (engine oil supply portion) is different. Even so, the oil jet can be used in common.
Further, the oil supply pipe 2a can be shared only by changing the bending shape. (In the current oil jet, the oil supply pipe 2a and the body 1 are forced to have a one-to-one relationship due to the horizontal hole position.)

The molding of the nozzle 2 can be performed by a plastic working process such as drawing or bending of a pipe material. (Fig. 5)
Through this process, the shape of the spring holder portion 2e to be press-fitted into the body 1, the spring receiving seat surface 2d for stabilizing the spring deformation, the ball receiving seat surface 2c serving as a ball stopper, and the oil as a piston cooling point Part shapes that satisfy the functional requirements of the oil jet, such as a bent shape of the oil supply pipe 2a leading to the oil pipe, an oil outlet 2b at the tip of the supply pipe, are provided.

An oil jet for cooling a piston according to the present invention has a seat surface connected to an opening and a body trunk in an oil jet that is in an engine and has a built-in valve function and supplies engine oil to cool the piston. A body and a nozzle in which a spring holder part, an oil supply pipe and an oil outlet are integrally formed from a single pipe material by drawing and bending are provided, and the spring holder part of the nozzle is attached to the body trunk part. It is press-fitted, and a ball receiving seat surface is formed at the open end of the spring holder portion of the nozzle. The ball receiving seat surface is arranged at a certain distance from the seat surface of the body, and further, the nozzle spring A spring receiving seat is made on the holder, and the spring presses the ball toward the seat surface of the body. Is supported by a spring receiving seat surface of the spring holder portion of the nozzle, the ball can be moved while receiving a pressing force of the spring between the seat surface and the ball receiving seat surface of the spring holder portion of the nozzle body The spring holder part of the nozzle is an oil jet for cooling a piston characterized in that the opening end is shaped like a petal and is press-fitted .

The oil jet shown in FIG. 3 includes a body 1, a nozzle 2, and a bracket 6.
The bracket holding portion on the outer peripheral surface of the body 1 is formed with a large number of tooth shapes. When the bracket 6 is caulked, the caulking portion of the bracket deforms and flows into the above tooth shape, and the body is rotated and dropped. To prevent.

The opening end of the spring holder portion 2e of the nozzle 2 is shaped like a petal, and the circumscribed circle diameter of the petal is substantially equal to the outer peripheral diameter of the cross section of the spring receiving seat surface 2d.
In order to ensure a slip-off load after caulking, it is desirable that the inner peripheral surface of the body 1 is formed in a cross-sectional shape corresponding to the outer peripheral surface shape of the spring holder portion 2e.
In this case, the entire contact surface of both is a portion that generates a counter force when the spring holder portion 2 e is press-fitted into the body portion of the body 1.
However, when a sufficient load can be secured after press-fitting, the inner peripheral surface of the body 1 can be formed into a simple cylindrical shape and held by the outer peripheral surface of the spring receiving seat surface 2d of the nozzle 2.
In addition, if there is a concern about insufficient shortage load, the lower opening end of the body 1 can be caulked during the press-fitting process, and assembly can be performed with a required load or more.

  The angular positional relationship between the caulking process of the bracket 6 to the body 1 and the press-fitting process of the nozzle 2 can be set independently, and the angular positional relationship between the cylinder hole 11 in the engine and the engine oil supply unit can be determined. It is possible to share oil jet products between different engines.

FIG. 6 shows the shape of the spring holder portion 2e of the nozzle 2 in another embodiment of the present invention.
In this embodiment, the petal-like spring holder portion 2e is not necessarily required to be isotropically symmetric.
That is, the inscribed circle of the ball receiving seat surface 2c formed at the open end of the spring holder portion 2e only needs to be smaller than the diameter of the ball 4 necessary for the valve function, and is stable when the ball 4 leaves the seat surface 1a. It may be ensured that it plays the role of a ball stopper.
At the same time, it is necessary to ensure a sufficient opening area so that a predetermined oil flow rate flows from the side surface of the ball 4 into the spring holder portion 2e of the nozzle 2.
This figure is one of the simplest shapes of the spring holder portion 2e that satisfies such requirements.

  Further, FIG. 7 is a type in which the spring holder portion 2e is notched and the spring receiving seat surface 2d is formed in order to secure the flow rate, and FIG. 8 is a type characterized by holding the spring 3 on the outer diameter side. is there.

It is a partial cross section figure of an engine showing arrangement of an oil jet. It is a block diagram of the conventional oil jet. It is a block diagram of the oil jet of this invention. It is a figure which shows the shape of the spring holder part which is one Embodiment of this invention. It is process drawing of the oil jet of this invention. It is a figure which shows the shape of the spring holder part in the other Example of this invention. It is a figure which shows the other Example of this invention. It is a figure which shows the other Example of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Body 1a Seat part 1b Opening part 2 Nozzle 2a Oil supply pipe 2b Oil outlet 2c Ball receiving seat surface 2e Spring holder seat 2d Spring receiving seat surface 3 Spring 4 Ball 5 Ball stopper 6 Bracket 8 Piston ring 10 Cylinder 11 Cylinder hole 12 Piston 13 Connecting rod 14 Crankshaft 15 Engine room

Claims (2)

  In an oil jet, which has a valve function and supplies engine oil to cool a piston, a body having a seat surface and a body trunk connected to an opening, a spring holder, and an oil supply pipe And a nozzle in which the oil outlet is integrally formed by drawing and bending from a single pipe material, and the spring holder part of the nozzle is press-fitted into the body body part. A ball receiving seating surface is formed at the opening end, the ball receiving seating surface is arranged at a certain distance from the seat surface of the body, and a spring receiving seating surface is formed on the spring holder portion of the nozzle. And the spring presses the ball toward the seat surface of the body, and at the spring receiving seat surface of the spring holder part of the nozzle. The ball is movable while receiving the pressing force of the spring between the seat surface of the body and the ball receiving seat surface of the spring holder portion of the nozzle, and the spring end portion of the nozzle has a petal at the open end. An oil jet for cooling a piston, characterized by being shaped into a press-fit shape.   2. The piston cooling oil jet according to claim 1, wherein the spring receiving seat surface is formed outside the spring holder portion of the nozzle.

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