JPH01193027A - Supercharging pressure controller - Google Patents

Abstract

PURPOSE:To obtain the smooth motion of a rod by providing a mesh spring fixed to the rod in a guide for restricting the swing of the rod in the device in the caption wherein the diaphragm is displaced due to differential pressure between two chambers to control valve opening via the rod. CONSTITUTION:The objective device is constructed by separating into an atmospheric chamber B and a pressure chamber A by a diaphragm 5, in case positive pressure is introduced to the pressure chamber from an introducing pipe 12 connected to the intake pipe, etc., of an internal combustion engine, which is displaced to the atmospheric chamber B side with resisting to the spring 11. Accordingly, a control valve is operated via a rod 8 to adjust air pressure supplied to the internal combustion engine. The swing of the rod 8 is restricted by a guide 13 and the spring 11 is fitted between this guide 13 and a holder 16. In this case, an circular mesh spring 15 fixed to the rod 8 is provided in the guide formed cylindrically. Accordingly, it becomes possible to effectively absorb the swing motion of the rod 8 so that the smooth motion of the rod 8 is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a boost pressure control device that adjusts the pressure of air supplied to an internal combustion engine using a turbine rotated by exhaust gas from the internal combustion engine, for example.

[Prior Art] Fig. 2 is a sectional view showing a conventional boost pressure control device disclosed in, for example, Japanese Utility Model Publication No. 62-33123, and in the figure (1) indicates a fixed member such as a main body of an internal combustion engine; (2) is a mounting plate attached to this fixing member (1), (3) is a bolt for attaching this mounting plate (2) to fixing member (1),
(4) is a housing fixed to the mounting plate (2) by welding, etc.;
(4&) is an atmospheric passage hole formed on one side of the housing (4);
(5) is a thin film-like diaphragm provided inside the housing (4), and the inside of the housing (4) is a pressure chamber (^) which is the first pressure chamber.
and an atmospheric chamber <a> which is a second pressure chamber.

(6) is a substantially dish-shaped pressure chamber side holder attached to one side of the diaphragm (5); (a) is the diaphragm (5);
), the atmospheric chamber side holder attached to the other surface of (8)
is inserted through the atmosphere passage hole (4a), and one end is connected to the pressure chamber side holder (6), the diaphragm (5), and the atmosphere chamber side holder (7).
) and a rod fixed thereto; (9) is a holding member provided near the atmospheric passage hole (4a) and holding the filter (10);
(13) is a guide that restricts the swinging of the rod (8), and a spring (11) is disposed between the atmospheric chamber side holder (7) and the guide (13). (12) is the pressure chamber (
This is an introduction tube whose tip is facing inside the introduction tube (1
2) is connected to an intake pipe (not shown) of the internal combustion engine to introduce positive pressure into the pressure chamber (^).

Next, the operation will be explained. First, when positive pressure is not introduced into the pressure chamber (^), that is, when the pressure inside the pressure chamber (A) is approximately equal to or lower than the pressure inside the atmospheric chamber (B), the diaphragm (5) is activated by the spring ( Due to the elastic force of 11), the tip of the pressure chamber side holder (6) moves into the pressure chamber (^)
It has been displaced to a position where it comes into contact with the inner wall surface (4b) of the casing (4) of the fill.

Next, when positive pressure is introduced into the pressure chamber (^) from the introduction pipe (12), that is, the pressure in the pressure chamber (
^) When the pressure inside is high, the diaphragm (5) resists the elastic force of the spring (11) and is displaced toward the atmospheric chamber (B) depending on the magnitude of the positive pressure. This diaphragm (5)
The displacement is further transmitted to the outside of the housing (4) via the wood (8), so that a control valve (not shown) connected to the rod (8) operates to control the air supplied to the internal combustion engine. Pressure is regulated.

Also, due to the displacement of the diaphragm (5), the atmospheric chamber (, B
) fluctuates, so air flows into and out of the atmospheric chamber (B) through the atmospheric passage hole (4a). Therefore, when air flows in, dust and the like try to enter the atmospheric chamber (B) together with the air, but this dust and the like is blocked by the filter (10).

Further, even if vibrations or the like are applied to the device, the guide (13) restricts the swinging of the rod (8), thereby preventing contact between the atmospheric chamber side holder (7) and the casing (4).

[Problems to be Solved by the Invention] Since the conventional supercharging pressure control device is configured as described above, when the rod (8) is subjected to vibration etc. and is subjected to rocking etc., the rod (8) Since the guide (13) restricts rocking, etc., excessive force is applied between the rod (8) and the guide (13), damaging the rod (8) and preventing smooth movement. The same problem occurred in that the filter (10) disposed in the atmospheric passage hole (4a) for preventing the intrusion of sand and dust etc. was also damaged due to the influence of the rocking of the lot (8).

This invention was made to solve the above-mentioned problems, and provides a supercharging pressure control device that does not generate excessive force on the diaphragm and guide, does not require a filter, and has a simple ti'ii. The purpose is to

[Means for Solving the Problems] A supercharging pressure control device according to the present invention is provided with a mesh spring fixed to a rod within a guide.

[Function] In the present invention, the mesh spring suppresses the swinging of the rod, and the mesh spring traps dust and the like that enters the diaphragm from within the second pressure chamber.

[Example] Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a cross-sectional view showing an embodiment of the present invention, and the same or corresponding parts as in FIG. 1 are designated by the same reference numerals, and the explanation thereof will be omitted.

In the figure, (15) is an annular mesh spring fixed to a rod (8) within a cylindrical guide (16), and this mesh spring (15) is made by compressing a thin steel wire knit. It was manufactured.

In the supercharging pressure control device configured as described above, when the rod (8) moves to the left in response to positive pressure from the introduction pipe (12), the rod (8) moves around its fulcrum (8a). Even when the mesh spring (15) swings, the outer circumference (15 m) of the mesh spring (15) comes into contact with the inner circumference (tea) of the guide (16), and the rod (8)
Since the rocking motion of 1. is absorbed, no undue stress is generated on the diaphragm (5) fixed to the guide (16) and rod (8). The rod (8) operates smoothly.

In addition, there is an atmospheric passage hole (4a) which is a ventilation hole in the atmospheric chamber (B).
) If dust enters from the mesh spring (15)
Since the mesh spring (15) is formed in a mesh shape, dust and the like are trapped in the mesh spring (15) and will not pass through the guide (16) and damage the diaphragm (5).

Furthermore, if the rod (8) is operating normally,
The inner circumference (lem) of the guide (16) and the mesh spring (1
Since there is a slight gap between the rod (8) and the outer circumference (15 m) of the rod (8), the mesh spring (
15) Not affected by frictional resistance.

Furthermore, when the rod (8) swings greatly, the flange (16b) of the guide (16) acts as a stopper against the swing of the rod (8), so it is difficult to destroy the mesh spring (15) itself. No stress occurs in the mesh spring (15).

In the above embodiment, the first pressure chamber is a positive pressure chamber (^) and the second pressure chamber is an atmospheric chamber (B), but the present invention is of course limited to this. Instead, the present invention can also be applied to a supercharging pressure control device in which, for example, the first pressure chamber or the second pressure chamber has a negative pressure.

[Effects of the Invention] As explained above, the supercharging pressure control device of the present invention is provided with a mesh spring fixed to the rod for suppressing swinging of the rod within the guide. This has the effect that unreasonable stress is not generated and the rod moves smoothly. Further, since the mesh spring traps dust and the like that enters the second pressure chamber through the ventilation hole, there is an effect that the filter that is conventionally required is unnecessary and the structure is simplified.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an embodiment of the present invention, and FIG. 2 is a sectional view showing an example of a conventional boost pressure control device. (4)...Housing, (4a)...Atmospheric passage hole, (5)
...Diaphragm, (8)...Rod, (15)
...Metshu spring, (16)...Guide, (^)...
・Pressure chamber (first pressure chamber), (B)... atmospheric chamber (second pressure chamber)
pressure chamber). In addition, in each figure, the same reference numerals indicate the same or corresponding parts as 5-5 earphragm.

Claims (1)

[Claims] a casing attached to an internal combustion engine, a diaphragm provided within the casing and defining a first pressure chamber and a second pressure chamber within the casing, one end of which is attached to the diaphragm and the casing; a rod protruding outside the chamber and connected to a control valve that adjusts the pressure of air supplied to the internal combustion engine through reciprocating motion; and a guide provided within the second pressure chamber that restricts swinging of the rod. In the supercharging pressure control device, a mesh spring is provided in the guide and fixed to the rod, and the mesh spring suppresses swinging of the rod and provides a flow from the second pressure chamber to the diaphragm. A supercharging pressure control device characterized in that it prevents the intrusion of dust, etc.