JP6228494B2 - Engine piping structure - Google Patents

Description

  The present invention relates to an engine piping structure, and more particularly, to an engine piping structure in which pipes can be easily attached even when two parts are close to each other.

  2. Description of the Related Art Conventionally, there is an engine piping structure in which two parts of an engine are connected by a pipe (see, for example, Patent Document 1).

  According to this type of piping structure, there is an advantage that two parts can communicate with each other with a simple structure.

  However, since the thing of this patent document 1 fits the both ends of a flexible pipe to each fitting cylinder which protruded from two parts, and attaches a pipe between two parts, there exists a problem.

Japanese Patent Laid-Open No. 11-210436 (see FIG. 1A)

<Problem> Pipe installation may be difficult.
In the thing of this patent document 1, since both ends of a flexible pipe are fitted to each fitting cylinder projected from two parts, and a pipe is attached between two parts, two parts approach, When each fitting cylinder is close, it is necessary to fit both ends of the pipe to each fitting cylinder while bending the pipe in the narrow space of both fitting cylinders, making pipe installation difficult There is a case.

  An object of the present invention is to provide an engine piping structure in which pipes can be easily attached even when two parts are close to each other.

Prior to this invention, the inventors of the present invention prototyped the engine piping structure shown in FIGS.
As shown in FIG. 3 (B), the engine piping structure is similar to Patent Document 1, in which two parts (11) and (12) of the engine are communicated by a flexible pipe (13). 3 (A), a pair of insertion holes (11b) (12b) provided in the walls (11a) and (12a) of the two parts (11) and (12) of the engine, and the pair of insertion holes ( 11b) and a pair of fitting cylinders (14) and (15) which are fitted and fixed in 12b, and a flexible pipe (13). As shown in FIG. Both ends of the pipe (13) are fitted into a pair of fitting cylinders (14) and (15), and the flexible pipe (13) is attached between the two parts (11) and (12).
However, when the two parts (11) and (12) approach and the pair of fitting cylinders (14) and (15) approach each other, within a narrow space between the fitting cylinders (14) and (15). It is necessary to fit both ends of the flexible pipe (13) to the pair of fitting cylinders (14) and (15) while bending the flexible pipe (13). Turned out to be difficult.
As a result of continuous studies, the inventors of the present invention do not use the flexible pipe (13) when the two parts (11) and (12) approach each other. By using the pipe (3) provided with the double cylinder (3c) shown in 2 (A) and (B), it was found that the pipe (3) can be easily attached, and the present invention has been achieved.

(Invention specific matters common to inventions according to claims 1 and 2)
As illustrated in FIG. 1 (B) or FIG. 2 (B), in an engine piping structure in which two parts (1) and (2) of an engine are connected by a pipe (3),
As illustrated in FIG. 1 (A) or FIG. 2 (A), a pair of insertion holes (1b) (2b) provided in the walls (1a) (2a) of the two parts (1), (2) of the engine. And a pipe (3)
As illustrated in FIG. 1 (A) or FIG. 2 (A), fitting portions (3a) and (3b) into a pair of fitting holes (1b) and (2b) are provided at both ends of the pipe (3). ) The fitting portion (3a) at one end is fitted and fixed in one fitting hole (2b), and the other end side of the pipe (3) is a double cylinder (3c) that can be extended and contracted along its axis (3d). The elastic seal (3e) is sandwiched between the double cylinders (3c),
As illustrated in FIG. 1 (B) or FIG. 2 (B), the double tube (3c) is extended so that the insertion portion (3b) at the other end is inserted into the other insertion hole (1b). The double cylinder (3c) is fixed and is frictionally fixed by the frictional force of the elastic seal (3e) in the extended posture .
(Invention-specific matters specific to the invention of claim 1)
As illustrated in FIGS. 1A and 1B, the pipe (3) is bent halfway,
The fitting portion (3a) at the lower end of the pipe (3) is press-fitted into one fitting hole (2b) oriented obliquely downward, and the fitting portion (3a) is frictionally fixed to the fitting hole (2b) by its elastic force. ,
The fitting portion (3a) at the lower end of the pipe (3) is composed of a rubber tube baked on the pipe (3), and the flange portion (3f) of the rubber tube is received by the wall (2a) of the component (2). The opening edge of the insertion hole (2b) is covered with the flange portion (3f),
By extending the double cylinder (3c) upward, the fitting portion (3b) at the upper end of the pipe (3) is fitted into the other fitting hole (1b) oriented upward, and this fitting hole (1b) The engine piping structure is characterized in that the fitting portion (3b) is fixed by screw fitting.
(Invention-specific matters specific to the invention of claim 2)
As illustrated in FIGS. 2A and 2B, the pipe (3) is bent halfway,
The fitting portion (3a) at the upper end of the pipe (3) is press-fitted into one fitting hole (2b) oriented sideways, and this fitting portion (3a) is frictionally fixed to the fitting hole (2b) by its elastic force,
By extending the double cylinder (3c) obliquely downward, the fitting portion (3b) at the lower end of the pipe (3) is press-fitted into the other fitting hole (1b) oriented obliquely downward, and this insertion hole ( In 1b), the fitting portion (3b) is frictionally fixed by its elastic force,
The fitting portion (3b) at the lower end of the pipe (3) is composed of a rubber tube baked on the pipe (3), and the flange portion (3g) of this rubber tube is received by the wall (1a) of the component (1), An engine piping structure characterized in that the opening edge of the insertion hole (1b) is covered with the flange portion (3g).

(Invention of Claim 1)
The invention according to claim 1 has the following effects.
<< Effect 1-1 >> Even when two parts are approaching each other, the pipe can be easily attached.
As illustrated in FIG. 1 (A) or FIG. 2 (A), fitting portions (3a) and (3b) into a pair of fitting holes (1b) and (2b) are provided at both ends of the pipe (3). ) The fitting portion (3a) at one end is fitted and fixed in one fitting hole (2b), and the other end side of the pipe (3) is a double cylinder (3c) that can be extended and contracted along its axis (3d). Then, an elastic seal (3e) is sandwiched between the double cylinders (3c), and the double cylinder (3c) is extended as shown in FIG. 1 (B) or FIG. 2 (B). The end fitting portion (3b) is fitted and fixed in the other fitting hole (1b), and the double cylinder (3c) is frictionally fixed by the frictional force of the elastic seal (3e) in the extended posture. The pipe (3) can be attached between the two parts (1) and (2) simply by extending the double cylinder (3c), and even if the two parts (1) and (2) are approaching, the pipe ( 3) Mounting becomes easy.

<< Effect 1-2 >> Even if it is a case where the direction of the insertion hole of two components differs, a pipe can be attached easily.
As illustrated in FIG. 1 (A), the pipe (3) is bent halfway, and as illustrated in FIG. 1 (A), the fitting portion (3a) at the lower end of the pipe (3) is oriented obliquely downward. It is press-fitted into the other insertion hole (2b), and is frictionally fixed by the elastic force of the insertion portion (3a), and the double cylinder (3c) is extended upward as illustrated in FIG. 1 (B). As a result, the fitting portion (3b) at the upper end of the pipe (3) is fitted into the other fitting hole (1b) oriented upward, and the fitting portion (3b) is fixed to the fitting hole (1b) by screw fitting. Therefore, the pipe (3) can be easily attached even when the direction of the fitting holes (1b) and (2b) of the two parts (1) and (2) is different.

<< Effect 1-3 >> It is possible to prevent the pipe from coming off due to its own weight.
As illustrated in FIG. 1 (B), when the double cylinder (3c) is extended upward, the other insertion hole (1b) in which the insertion portion (3b) at the upper end of the pipe (3) is directed upward is provided. ) And the fitting portion (3b) is fixed to the fitting hole (1b) by screw fitting, so that the pipe (3) can be prevented from coming off due to its own weight.

(Invention of Claim 2 )
The invention according to claim 2 has the following effects 2-1 and 2-2 in addition to effect 1-1 of the invention according to claim 1.
<< Effect 2-1 >> Even if it is a case where the direction of the insertion hole of two components differs, a pipe can be attached easily.
As illustrated in FIG. 2 (A), the pipe (3) is bent halfway, and as illustrated in FIG. 2 (A), the fitting portion (3a) at the upper end of the pipe (3) is oriented sideways. One insertion hole (2b) is press-fitted, and the insertion portion (3a) is frictionally fixed to the insertion hole (2b) by its elastic force. As shown in FIG. 2 (B), the double cylinder (3c) is By extending obliquely downward , the fitting portion (3b) at the lower end of the pipe (3) is press-fitted into the other fitting hole (1b) oriented obliquely downward, and the fitting portion (3b) is inserted into the fitting hole (1b). ) Is frictionally fixed by its elastic force, so that the pipe (3) can be easily attached even when the direction of the fitting holes (1b) and (2b) of the two parts (1) and (2) is different. Can do.

<< Effect 2-2 >> It is possible to prevent the pipe from coming off due to its own weight.
As illustrated in FIG. 2 (A), the fitting portion (3a) at the upper end of the pipe (3) is press-fitted into one fitting hole (2b) oriented sideways, and the fitting portion (2b) is inserted into the fitting portion (2b). Since 3a) is frictionally fixed by its elastic force, it is possible to prevent the pipe (3) from coming off due to its own weight.

FIG. 1A is a cross-sectional view illustrating a state in the middle of pipe installation, and FIG. 1B is a diagram illustrating a state in which pipe installation is completed. It is sectional drawing. FIG. 2A is a cross-sectional view illustrating a state in which a pipe is being installed, and FIG. 2B is a diagram illustrating a state in which the pipe has been completely installed. It is sectional drawing. FIG. 3A is a cross-sectional view illustrating a state in the middle of pipe installation, and FIG. 3B is a cross-sectional view illustrating a state where pipe installation is completed. It is.

  FIG. 1 is a diagram illustrating an engine piping structure according to a first embodiment of the present invention, and FIG. 2 is a diagram illustrating an engine piping structure according to a second embodiment of the present invention. The piping structure of a diesel engine will be described.

An engine piping structure according to a first embodiment of the present invention will be described.
As shown in FIG. 1 (B), two parts (1) and (2) of the engine are communicated by a pipe (3).
As shown in FIG. 1 (A), a pair of insertion holes (1b) and (2b) provided in each wall (1a) and (2a) of two parts (1) and (2) of an engine, and a pipe (3) I have.
One part (1) of the engine is a fuel injection case containing a fuel injection pump and a fuel injection camshaft, and is integrally formed with the crankcase. The wall (1a) of this component (1) is the bottom wall of the fuel injection case.
The pipe (3) is made of metal, but may be a synthetic resin having no flexibility.
The other part (2) of the engine is a crankcase. The wall (2a) of the component (2) is a lateral wall of the crankcase.
In the first embodiment, the engine oil accumulated in the fuel injection case which is one part (1) is returned into the crankcase which is the other part (2) by the pipe (3).

As shown in FIG. 1 (A), pipes (3) are provided with fitting portions (3a) and (3b) into a pair of fitting holes (1b) and (2b) at both ends, and fitting portions (3a) at one end of the pipe (3). ) Is inserted and fixed in one insertion hole (2b), the other end of the pipe (3) is a double cylinder (3c), and is extendable along its axis (3d). An elastic seal (3e) is sandwiched between 3c).
As shown in FIG. 1 (B), the double cylinder (3c) is extended, so that the insertion part (3b) at the other end is inserted into the other insertion hole (1b) and fixed. 3c) is frictionally fixed by the frictional force of the elastic seal (3e) in the extended posture.

As shown to FIG. 1 (A), the pipe (3) is bent in the middle and formed in the shape of a dogleg.
As shown in FIG. 1 (A), the fitting portion (3a) at the lower end of the pipe (3) is press-fitted into one fitting hole (2b) oriented obliquely downward, and the fitting portion (2b) 3a) is frictionally fixed by its elastic force .
As shown in FIG. 1 (B), when the double cylinder (3c) is extended upward, the other insertion hole (1b) in which the insertion part (3b) at the other end of the pipe (3) is oriented upward. The fitting portion (3b) is fixed to the fitting hole (1b) by screw fitting.
In order to screw-fit the fitting portion (3b), the double cylinder (3c) has a cylindrical double cylinder structure that can also slide in the circumferential direction.
The fitting portion (3a) at the lower end of the pipe (3) is composed of a rubber cylinder baked onto the pipe (3), and the flange (3f) of this rubber cylinder is the wall (2a ) of the crankcase in which the part (2) is formed. ) And the pipe (3) is positioned. The flange portion (3f) covers the opening edge of the insertion hole (2b). A male screw is formed in the fitting portion (3b) at the upper end of the pipe (3).

Next, a second embodiment will be described.
In FIG. 2 showing the second embodiment, the component (1) is a crankcase and the component (2) is a fuel injection case, contrary to the first embodiment.
As shown in FIG. 2 (A), the pipe (3) is bent halfway and formed into a U-shape.
As shown in FIG. 2 (A), the fitting portion (3a) at the upper end of the pipe (3) is press-fitted into one fitting hole (2b) oriented sideways, and the fitting portion (3a) is inserted into this fitting hole (2b). ) Is frictionally fixed by its elastic force.
As shown in FIG. 2 (B), when the double cylinder (3c) is extended obliquely downward, the other insertion hole (3b) at the lower end of the pipe (3) is oriented obliquely downward ( 1b), and the fitting portion (3b) is frictionally fixed by the elastic force in the fitting hole (1b) .

The fitting portion (3a) at the upper end of the pipe (3) is composed of a rubber tube baked on the pipe (3), and the flange portion (3f) of this rubber tube is a part (2) of the wall (2a) of the fuel injection case. ) And the pipe (3) is positioned. The fitting portion (3b) at the lower end of the pipe (3) is also composed of a rubber cylinder baked on the pipe (3), and the flange (3g) of the rubber cylinder is the part (1) of the crankcase wall (1a). The insertion of the insertion portion (3b) is restricted. The flange edge (3g) covers the opening edge of the insertion hole (1b).
In FIG. 2, the same elements as those in the first embodiment are denoted by the same reference numerals as those in FIG.
In each embodiment, the engine oil collected in the fuel injection case is returned to the crankcase by the pipe (3). However, the blowby gas in the breather chamber may be connected to the air cleaner by the pipe (3).

(1) Parts
(1a) Wall
(1b) Insertion hole
(2) Parts
(2a) Wall
(2b) Insertion hole
(3) Pipe
(3a) Insertion part at one end
(3b) Insertion part at the other end
(3c) Double cylinder
(3d) Axis
(3e) Elastic seal

Claims (2)

In the engine piping structure in which the two parts (1) and (2) of the engine are connected by the pipe (3),
A pair of insertion holes (1b) (2b) provided in each wall (1a) (2a) of two parts (1), (2) of the engine, and a pipe (3);
The pipe (3) is provided with fitting portions (3a) and (3b) into a pair of fitting holes (1b) and (2b) at both ends, and the fitting portion (3a) at one end of the pipe (3) is inserted into one fitting hole (2b). The other end of the pipe (3) is a double cylinder (3c) that can be expanded and contracted along its axis (3d), and an elastic seal (3e) is sandwiched between the double cylinders (3c). And
By extending the double tube (3c), the fitting portion (3b) at the other end is fitted into the other fitting hole (1b) and fixed, and the double tube (3c) is elastically sealed in the extended posture. Friction is fixed by the friction force of (3e) ,
Pipe (3) is bent halfway,
The fitting portion (3a) at the lower end of the pipe (3) is press-fitted into one fitting hole (2b) oriented obliquely downward, and the fitting portion (3a) is frictionally fixed to the fitting hole (2b) by its elastic force. ,
The fitting portion (3a) at the lower end of the pipe (3) is composed of a rubber tube baked on the pipe (3), and the flange portion (3f) of the rubber tube is received by the wall (2a) of the component (2). The opening edge of the insertion hole (2b) is covered with the flange portion (3f),
By extending the double cylinder (3c) upward, the fitting portion (3b) at the upper end of the pipe (3) is fitted into the other fitting hole (1b) oriented upward, and this fitting hole (1b) The engine piping structure is characterized in that the fitting portion (3b) is fixed by screw fitting. In the engine piping structure in which the two parts (1) and (2) of the engine are connected by the pipe (3),
A pair of insertion holes (1b) (2b) provided in each wall (1a) (2a) of two parts (1), (2) of the engine, and a pipe (3);
The pipe (3) is provided with fitting portions (3a) and (3b) into a pair of fitting holes (1b) and (2b) at both ends, and the fitting portion (3a) at one end of the pipe (3) is inserted into one fitting hole (2b). The other end of the pipe (3) is a double cylinder (3c) that can be expanded and contracted along its axis (3d), and an elastic seal (3e) is sandwiched between the double cylinders (3c). And
By extending the double tube (3c), the fitting portion (3b) at the other end is fitted into the other fitting hole (1b) and fixed, and the double tube (3c) is elastically sealed in the extended posture. Friction is fixed by the friction force of (3e) ,
Pipe (3) is bent halfway,
The fitting portion (3a) at the upper end of the pipe (3) is press-fitted into one fitting hole (2b) oriented sideways, and this fitting portion (3a) is frictionally fixed to the fitting hole (2b) by its elastic force,
By extending the double cylinder (3c) obliquely downward, the fitting portion (3b) at the lower end of the pipe (3) is press-fitted into the other fitting hole (1b) oriented obliquely downward, and this insertion hole ( In 1b), the fitting portion (3b) is frictionally fixed by its elastic force ,
The fitting portion (3b) at the lower end of the pipe (3) is composed of a rubber tube baked on the pipe (3), and the flange portion (3g) of this rubber tube is received by the wall (1a) of the component (1), An engine piping structure characterized in that the opening edge of the insertion hole (1b) is covered with the flange portion (3g).

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