JP3194070B2 - Cover device for diaphragm actuator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cover device applied to a diaphragm actuator used as an actuator for a constant-speed traveling device of an automobile.

[0002]

2. Description of the Related Art Conventionally, as an actuator for a constant-speed traveling apparatus, Japanese Patent Publication No. 4-36976 discloses a diaphragm actuator 1 comprising a ventilation control section 2 and a diaphragm section 3 as shown in FIG. ing. The diaphragm portion 3 includes a pressure chamber 3b defined by the diaphragm 3a, and houses a spring 3c for urging the diaphragm 3a in the pressure chamber 3b, and passes through the atmospheric pressure chamber on the opposite side of the pressure chamber 3b. A rod 3d connected to the diaphragm 3a and protruding out of the casing of the diaphragm 3
And a wire 3e connected to an accelerator pedal is locked to the rod 3d.

[0003] Further, a ventilation control section 2 includes a vent valve 2c and a safety valve 2d that connect the pressure chamber 3b to the atmosphere opening port 2a, and a pressure control valve, inside a casing having an atmosphere opening port 2a and a negative pressure introduction port 2b. The chamber 3b is connected to the negative pressure inlet 2b.
Are provided with three solenoid valves including a vacuum valve 2e communicating with the solenoid valve. The negative pressure introduction port 2b is connected to the intake passage of the engine through a pipe 4 having a check valve 4a interposed therebetween. When the vacuum valve 2e is opened, the intake negative pressure is introduced into the pressure chamber 3b, and the diaphragm 3a is pulled. The accelerator pedal is driven in a direction to increase the throttle opening by the movement in the direction. When the vent valve 2c is opened, the pressure chamber 3
Atmosphere is introduced into the pressure chamber b, the negative pressure in the pressure chamber 3b decreases, and the accelerator pedal is driven in the direction to decrease the throttle opening by the movement of the diaphragm 3a in the pushing direction. The safety valve 2d opens when the operation of the constant-speed traveling device is released or when an abnormality occurs. These valves 2c, 2d, and 2e are controlled by an electronic control circuit so that an appropriate vehicle speed is obtained. A filter 2f is mounted on each of the vent valve 2c and the safety valve 2d on the side of the atmosphere opening port 2a, and an accumulator 4b for accumulating a negative pressure is connected to the negative pressure introducing line 4.

[0004] Such a diaphragm actuator 1
In the above, if water enters through the air release port 2a, the ventilation control unit 2 is adversely affected. Therefore, conventionally, a tube is connected to the air release port 2a, and a tube is piped into a separately provided chamber, thereby opening the air release port. Open to the atmosphere through a chamber.

[0005]

When a tube is connected to the atmosphere opening port as described above, it is necessary to pipe the tube downward so that the water flowing into the tube can be drained. The chamber must be installed at a lower position than the diaphragm actuator, making it easier for the chamber to be wetted, resulting in an unfavorable layout for preventing water intrusion, and increasing the number of parts due to the need for tube piping members At the same time, a problem such as an increase in the number of assembling steps due to the piping work occurs.

SUMMARY OF THE INVENTION In view of the above, an object of the present invention is to provide a diaphragm actuator cover device which can prevent water from entering an air opening without piping a tube.

[0007]

In order to achieve the above object, according to the first aspect of the present invention, a cover is provided to secure a predetermined volume space between the diaphragm actuator and a ventilation control section and cover the ventilation control section. An air release port of the ventilation control unit is opened in the cover, a drain hole is formed in the cover, a stay member for mounting the diaphragm actuator is disposed below the drain hole , and an inner surface of the cover is provided. A rib forming a maze-shaped passage leading to the atmosphere opening port is protruded.
Furthermore, in the one in which the diaphragm actuator is arranged in an engine room of the vehicle, in the invention of claim 2, a cover is provided to secure a predetermined volume space between the diaphragm actuator and the ventilation control unit, and to cover the inside of the cover. Open the air release port of the ventilation control section, and open the air release port on the inner surface of the cover.
And a rib forming a maze-shaped passage leading to the diaphragm actuator , and a reserve tank for cooling water is arranged in front of the diaphragm actuator. In the invention of claim 3, the above-mentioned claim is provided.
The invention according to claim 1 or 2, wherein the lower surface of the cover is provided.
At the front of the drain hole formed on the lower surface
The wall was erected.

[0008]

[0009]

The vent opening of the ventilation control unit is opened to the atmosphere through the space inside the cover. Further, the cover covers not only the vent opening but also the ventilation control unit as a whole. A large volume of space can be ensured, and air containing water droplets outside the cover is not sucked into the air release port as it passes through the cover when air is sucked into the ventilation control unit from the air release port. Since the space for preventing intrusion is formed around the ventilation control part itself by the cover, it is harder to be wet compared to the conventional chamber which is connected to the air release port via a tube and installed at a lower position than the diaphragm actuator. In addition, water can be effectively prevented from entering the air opening.

[0010] Further, since the piping of the tube becomes unnecessary,
The number of parts and the number of assembling steps can be reduced, and according to the first aspect of the invention, even if water enters the cover, water can be discharged from the drain hole to the outside of the cover. In this case, there is a possibility that water droplets and the like jumped up from below enter the cover from the drain hole, but the stay member for mounting the diaphragm actuator located below the drain hole functions as a shielding member, Intrusion of water or the like from the drain hole is prevented. Furthermore,
Maze-like passage formed by ribs opens to atmosphere
Water can be more effectively prevented from entering.

According to the invention of claim 2, according to claim 1,
Similar to the invention, along with the water into the air opening penetration can be more effectively prevented by labyrinthine passages, air containing water droplets to flow from the front to the arrangement of the diaphragm actuator diaphragm is formed by a rib The splashing of water on the actuator can be suppressed by the cooling water reserve tank. Further, according to the third aspect of the present invention, the splatters fly from the front.
Waterproof wall prevents incoming water from entering the drain hole
Wear.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In the embodiment shown in the drawings, the diaphragm actuator 1 shown in FIG.
To which the present invention is applied. As shown in FIG. 3 to FIG.
A cover 5 that covers the ventilation control unit 2 while securing a predetermined volume space is attached thereto. A mounting stay 6 is fixed to the outer surface of the casing of the diaphragm unit 3, and one end of the stay 6 6a and the other end 6b, as shown in FIG.
A ventilation control unit 2 that is bolted to the front wheel house WH and the damper housing DH on one side of the engine room, and covers the diaphragm actuator 1 with the cover 5
Was attached to one side of the engine compartment with the outside facing.

When the diaphragm actuator 1 is mounted as described above, the projecting surfaces of the air opening 2a and the negative pressure inlet 2b of the ventilation control unit 2 are directed substantially forward, and the air opening a is connected to the negative pressure inlet 2b. It is located above. The stay 6 includes a check valve 4a in the middle of the pipe 4 connected to the negative pressure inlet 2b, and a harness 7 for the valves 2a, 2b, 2c drawn out from the vicinity of the negative pressure inlet 2b. The connector 7a at the end is held. 3f in the figure is
A bracket 4c, which is attached to the outer surface of the casing of the diaphragm 3 together with the stay 6 and locks the outer tube of the wire 3e, is a connection port for an accumulator 4b protruding from the outer surface of the check valve 4a.

A radiator R is arranged at the front end of the engine room. Here, the fan RF of the radiator R is designed to rotate leftward when viewed from the front of the vehicle. In order to prevent the high-temperature air from the radiator R shown from flowing into the intake port Ea of the engine E, the intake port Ea needs to be disposed on the right side of the engine room when viewed from the front, and is disposed on the opposite side to the intake port Ea on the layout. Air containing water droplets is likely to flow in the inevitable arrangement portion of the diaphragm actuator 1 (the left side of the engine room when viewed from the front), and it is necessary to take waterproof measures for the diaphragm actuator 1.

Therefore, in the present embodiment, a reserve tank T for cooling water is arranged in front of the diaphragm actuator 1 so that water is hardly applied to the diaphragm actuator 1, and the cover 5 is provided as described above.
The air opening 2a is opened in the space inside. The cover 5 covers not only the air opening 2a but also the entire ventilation control unit 2, so that a large volume of the space in the cover 5 can be secured, and the air from the air opening 2a into the ventilation control unit 2 can be secured. At the time of air suction, air containing water droplets from the outside of the cover 5 does not pass through the inside of the cover 5 and is sucked into the air opening port 2a as it is, so that intrusion of water from the air opening port 2a is prevented.

In this embodiment, the rear half 5a of the outer end face of the cover 5 is used to prevent interference with the vehicle body and to secure a space for inserting a tool when bolting the one end 6a of the stay 6 to the other end. Cannot bulge outward much, so that the front half part 5b of the outer end face is largely bulged outward to increase the volume of the space in the cover 5.

Further, the upper half 5c of the front side wall of the cover 5 facing the protruding surface of the air opening port 2a and the negative pressure introduction port 2b of the ventilation control section 2 is swelled forward to open the air therein. Mouth 2
a, and an air opening 2 is provided on the inner surface of the upper half 5c.
The rib 5d forming a maze-shaped flow path leading to a is provided so as to be more effectively prevented from entering water into the air opening 2a.

Here, the space inside the cover 5 is naturally provided at the same height as the diaphragm actuator 1 so that it is difficult to be wet. Further, in this embodiment, the space between the open end of the cover 5 and the diaphragm actuator 1 is provided. A gap is secured over substantially the entire circumference so that even if the lower part of the cover 5 is wet, the space inside the cover 5 is opened to the atmosphere through the gap at the upper part of the cover 5. The toughness against water is further improved.

As shown in FIGS. 5 and 6, the cover 5 is screwed to the end face of the diaphragm 3 on the side of the ventilation control section 2 at a pair of upper and lower bosses 5e, 5e projecting from the rear side wall. Since the upper half 5c of the front side wall of the cover 5 bulges forward as described above, a boss for screwing cannot be formed here, and the lower half of the front side wall is shown in FIG. As described above, since the negative pressure introduction port 2b and the harness 7 are formed in a cutout shape that is exposed to the outside, a boss portion for screwing cannot be formed here. Therefore, in this state, the cover 5 is supported at the rear side in a cantilever manner, and the vibration is easily generated. Therefore, in the present embodiment, as shown in FIGS.
The claw piece 5f is integrally formed on the lower half of the front side wall, and the claw piece 5f is engaged with the protruding edge 2g of the outer edge of the ventilation control section 2, so that the cover 5
Vibration can be prevented.

In this embodiment, as shown in FIGS. 4 and 5, a drain hole 5g is formed in the lower surface of the cover 5 so that even if water enters the cover 5, the drain hole 5g is formed through the drain hole 5g. Cover 5
Water can be discharged to the outside, and the stay 6 faces the drain hole 5g. The water scattered from below is blocked by the stay 6, and water enters the drain hole 5g. Can be prevented. Also, a drain hole 5 is formed on the lower surface of the cover 5.
The waterproof wall 5h is vertically installed at the front of the g, so that water scattered from the front can be prevented from entering the drain hole 5g.

Although the embodiment in which the present invention is applied to the cover device of the diaphragm accumulator 1 for a constant-speed traveling device has been described above, the present invention is also applicable to other diaphragm actuators having a ventilation control unit and a diaphragm unit. It is.

[0022]

As is apparent from the above description, according to the present invention, it is possible to prevent water or the like from entering the ventilation control section of the diaphragm actuator through the atmosphere opening port, and to prevent water from entering. The toughness is also improved, and the piping of the tube for opening to the atmosphere is not required, so that the number of parts and the number of assembly steps can be reduced. Furthermore, according to the first and third aspects of the invention, drainage from the cover is improved, and
Of water from the water drain hole intrusion can be prevented Rutotomoni, it can more effectively prevent water from entering the air opening, further claims
According to the second aspect , it is possible to make it difficult for water to be applied to the diaphragm actuator.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view of an example of a diaphragm actuator to which the device of the present invention is applied.

FIG. 2 is a schematic plan view of an engine room showing an arrangement position of a diaphragm actuator.

FIG. 3 is a plan view of a diaphragm actuator with a cover attached.

FIG. 4 is a side view seen from the direction of arrow IV in FIG. 3;

FIG. 5 is a sectional view taken along line VV of FIG. 4;

6 is a side view as viewed from the direction of arrow VI in FIG. 5;

FIG. 7 is an enlarged sectional view taken along the line VII-VII of FIG. 4;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Diaphragm actuator 2 Ventilation control part 2a Atmosphere opening port 3 Diaphragm part 5 Cover 5d Rib 5g Drain hole 5h Waterproof wall 6 Stay T For cooling water
Reserve tank

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) F15B 15/00-15/28 B60K 11/04

Claims (3)

(57) [Claims] 1. A cover device for a diaphragm actuator comprising a ventilation control section having an air opening and a diaphragm section, wherein a predetermined volume space is secured between the diaphragm control section and the ventilation control section. Provide a cover to cover,
An air opening of the ventilation control unit is opened in the cover, a drain hole is formed in the lower surface of the cover, a stay member for mounting the diaphragm actuator is disposed below the drain hole , and an inner surface of the cover is provided. Labyrinth to the air opening
A cover device for a diaphragm actuator, wherein a rib forming a passage protrudes . 2. An engine room of a vehicle , comprising a ventilation control section having an air opening and a diaphragm section.
A cover device for a diaphragm actuator, wherein a cover is provided to secure a predetermined volume space between the airflow control unit and the airflow control unit, and an air opening of the airflow control unit is opened in the cover. , A rib is formed on the inner surface of the cover to form a maze-like passage to the air opening
Cooling water in front of the diaphragm actuator
A cover device for a diaphragm actuator, wherein a reserve tank for the diaphragm is arranged . 3. The diaphragm actuator according to claim 1 , wherein a waterproof wall is vertically provided on a lower surface of the cover in front of a drain hole formed in the lower surface. Cover device.