JPS6232287A - Negative pressure supply equipment for automobile - Google Patents

Abstract

PURPOSE:To reduce the capacity of a negative pressure supply equipment by disposing, inside vacuum tank, both a motor which operates when a negative pressure in the vacuum tank exceeds a set value and reaches a proximity of the atmospheric pressure and a vacuum pump which is driven by said motor. CONSTITUTION:A vacuum switch assembly 2 which closes an electric circuit when a pressure in a vacuum tank 1 exceeds a specified value and approaches the atmospheric pressure is mounted on the upper case 3 of the vacuum tank 1. A pedestal 71 on which a motor 7 is fixed is integrally formed on the internal wall of a lower case 4. The crank mechanism 81 of a diaphragm pump 8 is formed on one end of the rotary shaft of the motor 7 and reciprocates a diaphragm 83 via a rod 82.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a negative pressure supply device that stores negative pressure generated in an automobile intake manifold in a vacuum tank and supplies it as a driving power source for equipment as needed. In particular, the present invention relates to a negative pressure supply device equipped with a vacuum pump that forcibly generates negative pressure in a vacuum tank when the negative pressure in the vacuum tank exceeds a predetermined value and approaches the atmosphere.

[Background of the invention]

Conventionally, in the type of negative pressure supply device, the vacuum tank and the vacuum pump were integrated into one body.
- known from Publication No. 9115, etc. - but when the two are integrated, there is no piping to connect them, and the configuration is simple, but the installation is necessary due to the increase in dead space and overall volume. However, there was a problem that space was not available and there was no flexibility in the installation location.

[Purpose of the invention]

The purpose of the present invention is to integrate the vacuum tank and vacuum pump of the negative pressure supply device without losing the effect of integrating them.
An object of the present invention is to provide a negative pressure supply device capable of reducing dead space and overall volume.

[Summary of the invention]

The present invention achieves the above object by installing a vacuum pump in a vacuum tank to eliminate the volume occupied by the vacuum pump.

[Embodiments of the invention]

The present invention will be explained in detail below based on an embodiment shown in the drawings.

Vacuum tank 1 is made of resin upper case 3 and lower case 4
It is composed of , and has a barrel shape as a whole.

The upper case 3 has a vacuum switch assembly 2 that compares the pressure in the vacuum tank with atmospheric pressure and closes an electric circuit when the pressure in the tank exceeds a predetermined value and approaches atmospheric pressure.
is installed.

The configuration of the vacuum switch assembly 2 will be explained in detail below.

A cylindrical portion 21 is integrally formed in the upper case 3. The opening at the tip of the cylindrical portion 21 is M22, and the opening at the inner end is closed by a diaphragm 23.

The diaphragm 23 is pressed against the inner wall of the case by a cap 25 for fixing the microswitch 24 to the inner wall of the upper case, and is fixed there. As a result, the inside of the cylindrical portion and the inside of the case are separated by the door 7 ram 23.

A spring 26 is disposed within the cylindrical portion 21, one end of which abuts a spring receiver 27 fixed at the center of the diaphragm 23, and the other end abuts an adjustment screw 28.

A small hole 29 is provided through the lid 22 to introduce the atmosphere into the cylindrical portion 21 .

The spring receiver 27 extends to the opposite side of the diaphragm 23, where it faces the contacts of the microswitch 24.

30 is the diaphragm 2 when fixing the diaphragm 23.
The diaphragm 2 provides a contact area and a contact force between the diaphragm 3 and the inner wall surface of the case, and also provides a pressing force opposing the spring 26.
This is a spring member attached to No. 3.

If the negative pressure inside the case is sufficient, the diaphragm 23 is pressed by the spring 26, so the contact point of the microswitch 24 is pressed by the spring receiver 27, and the lead wire 3
The electrical switch between 1 and 32 is open.

When the negative pressure inside the case becomes insufficient and the pressure exceeds a predetermined value and approaches the atmosphere, the spring 30 overcomes the force of the spring 26 and pushes the diaphragm 23 upward.

As a result, the contacts of the microswitch are released and lead wire 3
Close the electrical contact between 1 and 32.

This controls the operation of a motor-driven vacuum pump, which will be described later.

A nipple 5 is formed in the upper case 3 to which one end of a hose connecting the intake manifold and the tank is attached. An annular protrusion for attaching the check pulp 51 is formed on the swivel at the opening end of the nipple 5 on the inside of the case, and after fitting the check pulp 51 inside this, a cap 52 with a hole is fitted into the annular protrusion and fixed. and install the check pulp.

Furthermore, an output nipple 6 is formed in the upper case 3 for supplying negative pressure to control equipment. In this embodiment, the nipple 6 is configured so that one end of the hose is connected to it, but as shown in Japanese Patent Publication No. 57-3964, a three-way switching solenoid valve is attached to the output port of the tank so that it can be connected to either negative pressure or atmospheric pressure. It is also possible to configure the system to output either one of the following.

A base 71 for fixing the motor 7 is integrally formed on the inner wall of the lower case 4.

An L-shaped bracket 72 is formed on the motor 7, and the motor 7 is fixed to the inner wall of the lower case 4 by screwing the L-shaped bracket 72 to the base 71 with screws 73.

A crank mechanism 81 of the diaphragm pump 8 is formed at one end of the rotating shaft of the motor 7, and causes a diaphragm 83 to reciprocate via a rod 82.

The diaphragm 83 is arranged so as to cover the hole made in the lower case 4, and is closely fixed to the outer wall of the pump header 84. As a result, a working chamber 85 is formed between the diaphragm 83 and the header 84, and the hole made in the lower case 4 is sealed fluid-tight.

Furthermore, a terminal device 9 is fixed to the case 4 in a fluid-tight manner by penetrating the case.

The terminal device 9 is constructed in the form of a socket 93 with two lead terminals 91 and 92 fixed to the bottom thereof by a tree mold.

A protrusion 94 to which lead terminals 91 and 92 are fixed is formed at the bottom of the socket 93, and is fixed by fitting this protrusion 94 into a hole in the lower case 4 with a seal ring 95 sandwiched therebetween. .

The lead wire 31 is attached to the inner end of the case of the lead terminal 91.
The terminal 74 of the motor 7 is connected to the inner end of the case of the lead terminal 92.
One end of the lead wire 75 is connected to the other end of the lead wire 75. Note that one end of the lead wire 32 is connected to the terminal 74 of the motor 7.

Diaphragm pump 8 is shown in more detail in FIG.

Around the hole in the lower case 4 #)K is the annular protrusion 4 on the outer wall of the case.
1 is integrally formed, and the outer peripheral wall of the header 84 is fitted and fixed to the inner periphery of this protrusion 41.

At this time, the periphery of the diaphragm 83 is fluid-tightly clamped between the header 84 and the case.

An eccentric cam 81a is fixed to the end of the rotating shaft 76 of the motor 7, and a bearing 81b is fixed to the outer periphery of the cam 81a.

81c is a balance weight formed integrally with the cam 81a.

The bearing 81b is molded and fixed to the end of a resin connecting rod 86. A lower piece 86a of the diaphragm presser is integrally formed at the upper end of the connecting rod 86, and an upper piece 86b of the diaphragm presser that penetrates the diaphragm 83 and extends from the working chamber 85 side to the connecting rod side is attached to the lower piece 86.
The diaphragm 83 is fluid-tightly bonded between the two by fitting with b.

The upper piece of the diaphragm holder has a hole in the center for mounting an umbrella-shaped valve 87 as an intake valve, and a plurality of through holes 88 that are opened and closed by the valve. Also, the lower piece 86a of the diaphragm presser has a through hole 88 in the upper piece 86b of the diaphragm presser.
A plurality of through holes 89 are formed in cooperation with each other to communicate the inside of the tank and the working chamber 85.

The header 84 is provided with a plurality of holes 84a for communicating the working chamber 85 with the atmosphere, and an umbrella valve 84b as an exhaust valve for opening and closing these holes is attached to the top surface of the header. . An annular projection 84C surrounding an umbrella-shaped valve 84b is integrally formed on the upper surface of the header 84, and together with a sealing lid 84d fixed to the upper end of this projection, an exhaust chamber is formed.

Further, an exhaust port 84e is formed in the annular projection 84c, and a filter 84f is attached to the end of the exhaust port on the exhaust chamber side.

The upper cases 3 and 4 are fluid-tightly sealed by adhesive or welding at their divided surfaces.

The lead terminals 91,92 of the terminal device 9 are electrically connected to an external coupler and a power source is led thereto.

Engine negative pressure is guided from the nipple 5 through the check valve 51 into the vacuum tank by a hose. The check pulp 51 opens only when the vacuum tank internal negative pressure is lower than the engine negative pressure, and the air in the vacuum tank flows toward the engine. When the negative pressure inside the tank exceeds a set value and approaches atmospheric pressure, the diaphragm 23 of the vacuum switch 2 is lifted up, the microswitch 24 is turned on, and the motor 7 is connected to an external power source and driven. As the motor 7 rotates, the crank 81 rotates and the rod 82
is reciprocated to reciprocate the diaphragm 13. As a result, the total volume of the working chamber 85 formed by the header 84 and the diaphragm 83 is increased or decreased, and due to the pressure difference generated at this time, the intake valve 87 opens and the exhaust valve 18 closes, and the air in the tank is pumped through the intake hole. 88.89 to exhaust hole 84
a, filter 84f, and exhaust passage 84e to be discharged to the outside of the tank.

Thus, when the negative pressure inside the tank exceeds the set value and becomes sufficiently lower than the atmospheric pressure due to the operation of the pump, the vacuum switch 2 is activated.
is shut off and the pump stops.

According to this embodiment, the mounting space for the vacuum pump and the vacuum switch can be used as a space for the vacuum tank, and the volume of the negative pressure supply device can be greatly reduced. Additionally, since the tank itself performs the waterproof and dustproof functions of the vacuum pump and vacuum switch, as well as the guard function of the rotating parts of the pump, the number of parts can be reduced, resulting in a significant cost reduction.

〔Effect of the invention〕

As explained above, according to the present invention, there is a motor that operates when the negative pressure in the tank exceeds a set value and approaches atmospheric pressure;
Since the vacuum pump driven by this motor is installed in the vacuum tank, the volume of the negative pressure supply device can be reduced, and installation can be done with flexibility in location.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a negative pressure supply device according to an embodiment of the present invention, and FIG. 2 is an enlarged sectional view of the main parts thereof. 1... Vacuum tank, 2... Vacuum switch, 7... Motor, 8... Vacuum pump, 9...
...Terminal device.

Claims (1)

[Claims] 1. A vacuum tank connected to an intake manifold of an automobile, and a vacuum pump that forcibly generates negative pressure in the vacuum tank to maintain the negative pressure in the vacuum tank at a predetermined value. In the vacuum pump, the vacuum pump includes an electric wiring that penetrates the wall surface of the vacuum tank and extends into the tank, and a motor that is installed in the vacuum tank and receives power from outside via the electric wiring. A negative pressure supply device for an automobile, comprising: a pump device driven by the motor to discharge gas in the vacuum tank to the outside of the tank. 2. In the invention set forth in claim 1, the controller is connected between the electric wiring and the motor to detect the pressure in the tank and when the pressure approaches atmospheric pressure than a predetermined value. A negative pressure supply device for an automobile, characterized in that it is provided with a vacuum switch that is closed to allow power to be supplied to a motor. 3. In the invention set forth in claim 1 or 2, the pump device includes a diaphragm that covers a hole penetrating through the wall of the vacuum tank, and a diaphragm that covers the hole penetrated through the wall of the vacuum tank. A negative pressure supply device for an automobile, characterized in that it is a diaphragm pump including a pump header that is sealed and fixed around the diaphragm pump. 4. A vacuum tank that is connected to the intake manifold of the engine, stores negative pressure therein, and supplies negative pressure to control equipment as necessary; pressure detection means for detecting the pressure within the vacuum tank; and pressure detection means for detecting the pressure within the vacuum tank. An electric pump device that discharges the air in the vacuum tank to the atmosphere by an electric drive means that is activated when the pressure detected by the means exceeds a set value and approaches atmospheric pressure,
A fixing means for fixing the electric pump device to the inner wall of the vacuum tank, an intake means for sucking air in the vacuum tank into the pump of the electric pump, and a state in which the vacuum tank and the atmosphere are kept airtight. an exhaust means for connecting the discharge port of the electric pump to the atmosphere through the case of the vacuum tank; A negative pressure supply device for an automobile, comprising a wiring means for supplying more power. 5. The negative pressure supply device for an automobile according to claim 4, wherein the pump of the electric pump device is a diaphragm pump mechanism, and the electric drive means thereof is a motor. 6. Claim 5, wherein the diaphragm pump mechanism comprises a crank mechanism attached to the rotating shaft of the motor, a rod reciprocated by the crank mechanism, and a diaphragm fixed to the rod. and a header that cooperates with the diaphragm to form an operating chamber.
It is characterized by comprising an intake/exhaust means for sucking air in the vacuum tank into the working chamber when the volume of the working chamber increases, and discharging the air in the working chamber to the outside of the vacuum tank when the volume of the working chamber decreases. Negative pressure supply device for automobiles. 7. In claim 6, the header:
A negative pressure supply device for an automobile, characterized in that the device is installed so as to close a hole made in the vacuum tank case, and the diaphragm is clamped between the header and the case to form an operating chamber. 8. Claim 4, wherein the pressure detection means is connected to a pressure detection device for detecting the pressure in the vacuum tank and a power supply path of the drive means, and is connected to the output of the pressure detection device. A negative pressure supply device for an automobile, characterized in that it is comprised of electrical contacts that open and close according to the conditions.