JPH0441263Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a vacuum device that issues an alarm in the event of a failure, and particularly to one that is effective for use in a vacuum brake booster in a vehicle brake system.

As a vacuum brake booster, as shown in FIG. In some cases, a booster device 4 is configured to use a booster device 4 to increase the force applied to the brake pedal. It is common to configure

As shown in FIG. 1, a pressure detector 6 is installed on the low pressure side of the check valve 5 at the suction port of the vacuum pump 1 as a vacuum brake booster that generates an alarm when the vacuum pump 1 fails. connect,
It is conceivable that the detector 6 may be configured to activate an alarm when abnormal pressure is detected by the detector 6.

As a configuration in which the pressure detector 6 is connected to the low pressure side of the check valve 5 at the suction port of the vacuum pump 1, a vacuum device as shown in FIG. 2 is generally considered.

In FIG. 2, the housing 9 of the vacuum pump 1
A unit 11 constituting the check valve 5 is attached to the suction port 10 opened in The connector 12 and the cylindrical second connector 13 to which the auxiliary passage 8 to which the pressure detector 6 is attached are connected are each externally packaged.

However, in such a vacuum device, since the two connectors for the main passage and the sub passage are coaxially mounted, it has been revealed that the following problems occur.

(1) The relative positional relationship between both connectors increases the error during assembly.

(2) The high intake port makes it difficult to install in a limited space such as an engine room.

An object of the present invention is to provide a vacuum device that can avoid such problems.

In the vacuum device according to the present invention, a check valve is attached to an inlet 10 provided in a housing 9 of a vacuum pump 1, and a main passage 7 is connected to the check valve so as to communicate with the valve passage. In the vacuum device, the check valve includes a valve body 14 screwed into the suction port 10, and a valve passage 15 opened in the valve body 14 and connected to the main passage 7.
and a valve port 16 formed in this valve passage 15.
, a valve seat 17 formed around the valve port 16 of the valve body 14, and a valve seat 17 formed on the suction port side of the valve seat 17.
A valve body 18 is disposed facing each other so as to be able to move toward and away from the valve body 14 , and a valve spring 19 is constantly biased by exerting a reaction force on the valve body 14 in the direction of seating the valve body 18 on the valve seat 17 .
A connector 24 formed in a cylindrical shape is fitted to the outer periphery of the valve body 14, and this connector 24 is screwed into the valve body 14 to be tightened together with the suction port 10. Furthermore, the main passage 7 is connected to the connector 24, and this main passage 7 and another sub passage 8 are arranged at a position spaced apart from the main passage 7 in the axial direction and are connected. Furthermore, a sealing member 28 is interposed between the connector 24 and the valve body 14 between the connection position of the main passage 7 and the connection position of the auxiliary passage 8. It is characterized in that detours 22 and 23 that detour around 6 are formed so that the sub passage 8 and the suction port 10 communicate with each other.

The present invention will be described below with reference to embodiments shown in the drawings.

FIG. 3 is a longitudinal sectional view showing an embodiment of the present invention.

In this embodiment, the vacuum pump housing 9
A valve body 14 of a check valve is screwed into the suction port 10, and a valve passage 15 is formed inside the valve body 14 in a substantially T-shape. A valve port 16 surrounded by a valve seat 17 is formed in the middle of the valve passage 15. Inside the valve passage 15, a poppet 18 serving as a valve body is seated on and off the valve seat 17 to open the valve port 16. It is interposed so that it opens only in the suction direction. Inside the valve passage 15, a valve spring 19 whose one end is locked to a ring-shaped stopper 20 is provided so as to constantly bias the poppet 18 in a direction to seat the poppet 18 on the valve seat 17. A plurality of notches 20a are radially cut out to ensure passages.

A recess 22 is cut into an annular shape on the outer periphery of the intermediate portion of the valve body 14, and a pore 23 is opened at the bottom of the recess 22 so as to communicate with the lower pressure side of the valve passage 15 than the valve port 16. has been done. This pore 23 and the recess 22 substantially constitute a detour 21 that detours around the valve port 16 .

A cylindrical connector 24 is fitted onto the outer periphery of the valve body 14, and seal members 25 and 26 are sandwiched between the upper and lower end surfaces of the connector 24, respectively. The connector 24 is screwed together with the housing 9 by the valve body 14, and is maintained in a sealed state by seal members 25 and 26. A recess 27 is cut in the upper inner circumferential surface of the connector 24 in the shape of an annular band, and the recess 27 faces the opening of the valve passage 15 that opens on the outer circumferential surface of the valve body 14 . At the position of the recess 27 of the connector 24,
A main passage 7 that communicates with the tank 2 (see Fig. 1) is connected to the valve passage 15, and a warning lamp or a buzzer or the like is installed at a position of the connector 24 facing the detour recess 22. Pressure detector 6 (see Figure 1) for operating the device at a predetermined time
A sub passage 8 to which the detour 21 is attached is connected to communicate with the detour 21.

Between the joint surface of the inner circumferential surface of the connector 24 and the outer circumferential surface of the valve body 14, there is a connection position of the main passage 7 and a sub-passage 8.
A sealing member 28 is sandwiched between the connecting position of the main passage 7 and the connecting position of the main passage 7.
Communication between the valve passage 15 and the sub passage 8, and between the valve passage 15 and the detour passage 21 are completely blocked.

Note that 29 is a drive shaft mounted eccentrically with respect to the center of the housing 9, and 30 is a vane rotor rotated by the drive shaft.

Next, the action will be explained.

When the suction port 10 is sucked by the rotation of the vane rotor 30, the poppet 18 moves away from the valve seat 17 against the valve spring 19 and opens the valve port 16. This suction force is applied to the main passage 7 via the valve passage 15, and is led to the tank 2 by the main passage 7, thereby evacuating the tank.

On the other hand, the suction force acting on the suction port 10 is
3. It also joins the auxiliary passage 8 via the detour recess 22 and is led directly to the pressure detector 6 by the auxiliary passage 8. When the pressure detector 6 detects that an abnormality has occurred in this suction force, the pressure detector 6 causes an alarm to generate a predetermined alarm. Therefore, an alarm in the event of a failure of the vacuum pump 1 will be issued by detecting an abnormality in the suction force of the vacuum pump 1, and therefore, an alarm will be issued immediately after the failure of the vacuum pump 1 occurs. .

According to this embodiment, the main passage communicating with the tank and the sub passage to which the pressure detector is attached are connected to one connector, and the two passages are separated by a sealing member, so that the following can be achieved. effect can be obtained.

(1) By connecting the main passage and the sub passage to one connector, relative positional deviation errors due to the two connectors are avoided, so the relative positional relationship between the main passage and the sub passage Accuracy can be improved.

(2) Since the number of sealing points is reduced only to the upper and lower end faces of the connector and between the main passage and the sub passage, the performance of the vacuum pump and the reliability of the alarm can be improved.

(3) Because the number of parts and assembly man-hours are reduced,
Cost can be reduced.

(4) Since the height at the intake port can be suppressed, installation in narrow spaces such as engine rooms is advantageous.

(5) By applying the suction force of the vacuum pump directly to the pressure detector, a vacuum pump failure alarm can be issued immediately after a vacuum pump failure occurs, so appropriate measures can be taken quickly. Therefore, it is possible to prevent a failure of the vacuum pump from affecting the brake booster and causing a serious accident.

It should be noted that the present invention is not limited to the above-mentioned embodiments, and may be modified without departing from the gist thereof.
It goes without saying that various changes are possible.

For example, detours are not limited to forming small holes, but can also occur in the threaded portion between the valve body and the housing.
You may also use the space.

Vacuum pumps are not limited to vane pumps, and check valves are not limited to poppet valves.

As explained above, according to the present invention, it is possible to prevent errors during assembly regarding the relative positional relationship between the main passage 7 and the sub passage 8, and to suppress the height of the check valve at the suction port to a low level. be able to.

[Brief explanation of the drawing]

Fig. 1 is a circuit diagram showing a vacuum brake booster to which the present invention can be applied, Fig. 2 is a longitudinal cross-sectional view showing a generally considered vacuum device, and Fig. 3 is a longitudinal cross-sectional view showing an embodiment of the present invention. It is a front view. 1... Vacuum pump, 2... Tank, 3... Check valve, 4... Brake booster, 5... Inlet check valve, 6... Pressure detector, 7... Main passage, 8...
...Sub-passage, 9...Housing, 10...Intake port,
11...Check valve unit, 12...Connector exclusively for main passage, 13...Connector exclusively for sub-passage, 14...
... Valve body, 15 ... Valve passage, 16 ... Valve port, 17
... Valve seat, 18 ... Poppet (valve body), 19 ...
Valve spring, 20... Stopper, 20a... Notch,
21... detour, 22... recess, 23... pore,
24... Connector, 25, 26... Seal member,
27... recess, 28... sealing member.

Claims (1)

[Scope of Claim for Utility Model Registration] A check valve is attached to the suction port 10 provided in the housing 9 of the vacuum pump 1, and the main passage 7 is connected to the check valve so as to communicate with the valve passage. In the vacuum device, the check valve includes a valve body 14 screwed into the suction port 10, and a valve passage 15 opened in the valve body 14 and connected to the main passage 7.
and a valve port 16 formed in this valve passage 15.
, a valve seat 17 formed around the valve port 16 of the valve body 14, and a valve seat 17 formed on the suction port side of the valve seat 17.
A valve body 18 is disposed facing each other so as to be able to move toward and away from the valve body 14 , and a valve spring 19 is constantly biased by exerting a reaction force on the valve body 14 in the direction of seating the valve body 18 on the valve seat 17 .
A connector 24 formed in a cylindrical shape is fitted to the outer periphery of the valve body 14, and this connector 24 is screwed into the valve body 14 to be tightened together with the suction port 10. Furthermore, the main passage 7 is connected to the connector 24, and this main passage 7 and another sub passage 8 are arranged at a position spaced apart from the main passage 7 in the axial direction and are connected. Furthermore, a sealing member 28 is interposed between the connector 24 and the valve body 14 between the connection position of the main passage 7 and the connection position of the auxiliary passage 8. 6. A vacuum device characterized in that detours 22 and 23 are formed to connect the sub passage 8 and the suction port 10.