JPH0683535U - Vacuum test equipment - Google Patents

Abstract

(57) [Summary] [Object] The present invention is to provide a vacuum degree test device capable of easily checking the vacuum degree of a brake hydraulic pipe system with an ABS device. [Configuration] Wheel cylinder 1 from master cylinder 18
An ABS device for reducing the braking hydraulic pressure of the brake hydraulic pipe system reaching 9 by the hydraulic control valve 6 in the hydraulic unit 5 is used as a test object, and fixing means 311 for fixing the hydraulic unit 5 to the base frame 30. 312, a vacuum gauge 321 detachably connected to the wheel cylinder side connection port 23 of the hydraulic unit 5, and a suction opening a.
A vacuum pump 33 that is connected to the valve via a joint 39 and sucks air in the brake hydraulic pipe system, a pump control device 34 that controls the operation of the vacuum pump, and a vacuum gauge 32.
The recording means 36 for recording the detected vacuum value of No. 1 is provided.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention uses, as an object to be tested, an ABS device for reducing the braking hydraulic pressure of the brake hydraulic pipe system by a hydraulic control valve in the hydraulic unit, and a vacuum degree test for detecting the degree of vacuum of the brake hydraulic pipe system in the ABS device. Regarding the device.

[0002]

[Prior art]

 The brake hydraulic pipe system of a vehicle is required to have high reliability and durability. In particular, in order to improve safety during braking, the brake hydraulic pipe system is used as the front and rear wheel X pipes to prevent the total hydraulic pressure from leaking even when a part of the hydraulic pressure in the brake hydraulic pipe system leaks, and to prevent the rear wheel from becoming early. A proportioning valve for lock prevention is attached. In the meantime, there is known a brake hydraulic pipe system provided with an ABS device which can suppress wheel lock during braking and improve safety. When the wheels tend to lock during sudden braking or on a slippery road surface, this ABS device can temporarily release the braking hydraulic pressure of the wheels to hold the wheel lock, which allows the direction of braking to be controlled. The stability and maneuverability can be secured and the braking stop distance can be shortened. An example of such a brake hydraulic pipe system with an ABS device is shown in FIG.

This brake hydraulic pipe system adopts front and rear wheel X pipes, and transmits the braking hydraulic pressure to the front left wheel FL and the rear right wheel RR and the first piping 1 and the front right wheel FR and the rear left wheel RL. The second pipe 2 and the first and second branch pipes 3 and 4 that branch to the rear right wheel RR of the first pipe and the rear left wheel RL of the second pipe. Proportioning valves 101 and 201 are attached to the first and second branch pipes 3 and 4, respectively, to reduce the braking hydraulic pressure on the rear wheel side by a predetermined amount with respect to the front wheel side.

Further, as shown in FIG. 6, in the hydraulic unit 5 of the brake hydraulic pipe system, a first hydraulic control valve 6 for increasing / decreasing the braking hydraulic pressure of the front left wheel FL and a braking hydraulic pressure of the front right wheel FR are provided. A second hydraulic control valve 7 for increasing / decreasing control, a third hydraulic control valve 8 for increasing / decreasing the braking hydraulic pressure of the rear left wheel RL, and a fourth hydraulic control valve 9 for increasing / decreasing the braking hydraulic pressure of the rear right wheel RR are respectively arranged. It is set up. Moreover, the hydraulic unit 5 is additionally provided with a pressurizing pump 10 and an accumulator 11, a control pressure passage 12 communicating with them, a low pressure passage 13 communicating with the hydraulic unit reservoir tank 17, and a first hydraulic control valve. The FL solenoid 14 for switching and controlling the pilot pressure of No. 6, the FR solenoid 15 for switching and controlling the pilot pressure of the second hydraulic control valve 7, the pilot pressure of the third hydraulic control valve 8 and the fourth hydraulic control valve 9 are simultaneously controlled for switching. And a rear solenoid 16 which operates.

The hydraulic unit 5 of such a brake hydraulic pipe system supplies the braking hydraulic pressure from the master cylinder 18 to each wheel cylinder 19 through the first to fourth hydraulic control valves 6, 7, 8 and 9 during braking. As a result, each wheel cylinder 19 generates a braking force, and when a control system (not shown) detects a wheel locking tendency, the control system switches the hydraulic control valve and solenoid of the corresponding wheel to prevent the braking hydraulic pressure from being locked. Increase / decrease control. Such a brake hydraulic pipe system equipped with an ABS device should be checked for leaks in the brake hydraulic pipe systems 1, 2, 3 and 4 that reach the wheel cylinder 19 from the master cylinder 18 before being installed in the vehicle. The degree of vacuum is being measured.

Conventionally, when performing a vacuum degree check of a brake hydraulic pipe system equipped with this ABS device, first, a vacuum gauge is installed in a pair of inlet-side openings 21 and 22 toward the master cylinder 18 of the hydraulic unit 5 with a vacuum pump. Connect and attach a vacuum pump to the wheel cylinder side connection ports 23, 24, 25 and 26 of each hydraulic control valve 6, 7, 8 and 9 to evacuate and measure the ultimate vacuum of the inlet side openings 21 and 22. is doing. Although the vacuum degree data measured in this way differs depending on the product of each hydraulic unit, the vacuum degree must meet the vehicle-specific required level when the vehicle is installed. For this reason, products that do not reach this required level must be excluded as inappropriate for vehicles, and vacuuming work was indispensable when mounting on vehicles.

[0007]

[Problems to be solved by the device]

 In this way, the brake hydraulic pipe system with the ABS device checks the degree of vacuum around the hydraulic unit and checks the leak portion before it is mounted on the vehicle. However, as described above, a lot of time is required for the work of mounting the vacuum gauge and the vacuum pump on the hydraulic unit and the work of checking them. For this reason, conventionally, a specified number of products were extracted from the products delivered in a specified amount, and the data of the extracted products were regarded as the data of all the remaining products to simplify the inspection.

However, in such a brake hydraulic pipe system with an ABS device, it is desirable to check the vacancy of all individual products and to check for leaks, which simplifies the work of checking the vacuum degree. Is desired. An object of the present invention is to provide a vacuum degree testing device that can easily check the vacuum degree of a brake hydraulic pipe system with an ABS device.

[0009]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the present invention tests an ABS device in which the brake hydraulic pressure of the brake hydraulic pipe system reaching the wheel cylinder from the master cylinder is reduced by the hydraulic control valve in the hydraulic unit when the wheels tend to lock. In the vacuum test apparatus as a body, a fixing means for removably fixing the hydraulic unit at a set position on the base frame, and the above hydraulic unit for detachably connecting the wheel cylinder to the hydraulic control valve. A vacuum gauge that is detachably connected to the wheel cylinder side connection port of the lick unit, and a vacuum pump that is connected to the suction opening of the master cylinder via a joint and that sucks air in the brake hydraulic pipe system. A pump controller for controlling the operation of the vacuum pump, and recording means for recording the vacuum value detected by the vacuum gauge. Characterized in that was.

[0010]

[Action]

 The fixing means can detachably fix the hydraulic unit to the set position on the base frame, the vacuum gauge can be detachably connected to the wheel cylinder side connection port of the hydraulic unit, and the vacuum pump controlled by the pump controller can be installed. Air in the brake hydraulic system can be sucked by connecting to the suction opening of the master cylinder via a joint, and the vacuum value detected by the vacuum gauge is recorded by the recording means, so the degree of vacuum can be checked reliably and easily. You can do it.

[0011]

【Example】

 FIG. 1 shows a vacuum degree test apparatus as an embodiment of the present invention. This vacuum tester uses a brake hydraulic pipe system with an ABS device as the test object. The brake hydraulic pipe system with the ABS device is the same as that shown in FIGS. 5 and 6, and the duplicate description of the brake hydraulic pipe system with the ABS device as the DUT is omitted here. Here, as shown in FIG. 1, the vacuum degree test apparatus includes a base frame 30 combined in a box shape with metallic column materials. On the base frame 30, a set position S 1 is formed in the central space. At the set position S, fixing means 311 and 312 for detachably fixing the hydraulic unit 5, the hydraulic pipe P (see FIG. 5) and the master cylinder 18 are provided. Further, the base frame 30 is a Pirani type detachably connected to the four wheel cylinder side connection ports 23, 24, 25, 26 (see FIGS. 6 and 2) on the hydraulic unit 5 at the set position S, respectively. Vacuum gauges 321, 322, 323, 324, a vacuum pump 33 attached to the lower portion of the base frame 30 and sucking air in the brake hydraulic pipe system, and a pump control device 34 for controlling the operation of the vacuum pump 33. Further, indicators 351, 352, 353, 354 for displaying the vacuum values detected by the respective vacuum gauges 321, 322, 323, 324, and a recording means 36 for recording the respective vacuum values are attached.

The fixing means 311 and 312 are attached to the set frame members 301 and 302 that regulate the set position S, and the hydraulic unit 5, the hydraulic pipe P (see FIG. 5) and the master cylinder 18 can be attached and detached. It suffices if it can be fixed to the above, and a known means such as a combination of an elastic member and a pressing piece can be used. The vacuum gauges 321, 322, 323, 324 are Pirani vacuum gauges having a measurement range of 10 to 0.1 Pa (1/10 to 1/10 ³ mmHg). Here, each vacuum gauge and the four wheel cylinder side connection ports 23, 24, 25, 26 can be connected via a measuring instrument side joint 49 and a negative pressure pipe 37 as shown in FIG. Reference numeral 42 represents a pump vacuum gauge for detecting the degree of vacuum of the vacuum pump 33.

As shown in FIG. 1, the vacuum pump 33 can be attached to and removed from the suction opening a of the reservoir tank 181 of the master cylinder 18 via the negative pressure pipe 38 and the pump side joint 39 in place of the cap 182 (see FIG. 6). Is fitted to. Here, the pump control device 34 that controls the vacuum pump 33 is configured to be able to perform on / off control by the open / close switch 40 and on / off control during the operating time set by the attached timer 41. The indicator 351 indicates the degree of vacuum on the side of the first hydraulic control valve 6 facing the front left wheel FL by the vacuum gauge 321, and the indicator 352 indicates the vacuum on the side of the second hydraulic control valve 7 facing the front right wheel FR by the vacuum gauge 322. The indicator 353 indicates the degree of vacuum on the side of the third hydraulic pressure control valve 8 facing the rear left wheel RL by the vacuum gauge 323, and the indicator 354 indicates the fourth hydraulic pressure control by the vacuum gauge 324 facing the rear right wheel RR. The degree of vacuum on the valve 9 side can be displayed respectively. Reference numeral 43 indicates an indicator for displaying the degree of vacuum of the vacuum pump 42.

The recording means 36 only needs to be able to record the vacuum degree data individually displayed by the displays 351, 352, 353, 354 at a predetermined interval over time, and here, a well-known digital recorder is adopted. It should be noted that the recording means 36 can perform the recording processing operation in conjunction with the operation signal of the pump control device 34. A procedure for checking the degree of vacuum of the brake hydraulic pipe system with the ABS device as the object to be tested by such a vacuum degree test apparatus will be described.

The operator mounts a brake hydraulic pipe system with an ABS device including a hydraulic unit 5, a hydraulic pipe P, a master cylinder 18 and the like at a set position S on the base frame 30, and uses fixing means 311 and 312 to fix the same. Lock in position. Further, the negative pressure pipes 37 extending from the vacuum gauges 321, 322, 323, 324 are connected to the four wheel cylinder side connection ports 23, 24, 25, 26 on the hydraulic unit 5 at the set position S, and the negative pressure pipes 37 on the master cylinder 18 are connected. The cap 182 is removed from the reservoir tank 181, the pump side joint 39 is fitted into the suction opening a, and the suction opening a of the master cylinder 18 and the vacuum pump 33 are connected via the negative pressure pipe 38. Furthermore, the operating time is set by the timer 41, here 120 seconds, and further the time width of data collection, here 10 seconds interval is set.

When the preparation for the vacuum degree check of the brake hydraulic pipe system with the BS device is completed, data collection is started. First, when a measurement start command is issued by turning on the start switch 44, the pump controller 34 drives the vacuum pump 33 and waits for the pump vacuum gauge 42 to reach 0.5 Torr. Then, when it is detected that the pressure reaches 0.5 Torr, the pump is further operated for 20 seconds, the on-off valve (not shown) of each port is opened, and the evacuation is started. When the vacuum pump 33 is driven, the inside of the reservoir tank 181 is made negative through the negative pressure pipe 38, and the negative pressure there is further passed through the master cylinder 18 to the hydraulic pipe P, the hydraulic unit 5, and each wheel cylinder side connection port. It is transmitted to the vacuum gauges 321, 322, 323, 324 through 23, 24, 25, 26.

When the measurement is started, the recording unit 36 sequentially records the data of the vacuum gauges 321, 322, 323, 324 until 120 seconds elapse every 10 seconds. During this period, the display devices 351, 352, 353, 354 sequentially display the vacuum value of each port which changes with time. Then, after 120 seconds have passed, the pump controller 34 stops the operation of the vacuum pump 33 and the recording means 36. Thereafter, the operator removes the brake hydraulic pipe system with the ABS device as the DUT from the set position S on the base frame 30, and enters the next set of the DUT. Here, Table 1 shows an example of data of evacuation performed by the present inventor for a specific test object. Further, Fig. 4 shows a comparative graph of each hydraulic unit made based on the vacuum drawing data obtained from a plurality of test objects by product.

[0018]

[Table 1]

Here, as shown in Table 1, the degree of vacuum of each of the four ports (wheel cylinder side connection ports 23, 24, 25, 26) varies from 1.9 to 3.5. The average value of the degree of vacuum reached was 2.4 Torr. Also, the ultimate vacuum for each product is 2. There was a variation of 3 to 10.6 Torr. In this way, the vacuum evacuation data of the brake hydraulic pipe system with the ABS device is sequentially collected, and based on the data, the leaked part of each DUT can be checked and the ultimate vacuum of each product can be checked. You can judge whether it is suitable or not. It should be noted that a comparison means is connected to the pump control device 34, and this comparison means judges by comparing the detection data and whether or not the inspection vacuum degree has reached an appropriate vacuum degree with an appropriately set appropriate threshold value. If the value does not reach the threshold value, it may be possible to display a defective vacuum degree or the like.

[0020]

[Effect of device]

 As described above, according to the present invention, the hydraulic unit is detachably fixed, the vacuum gauge is connected to the wheel cylinder side connection port of the hydraulic unit, and the vacuum pump is connected to the suction opening of the master cylinder. Since the recording means records the vacuum value by sucking the air in the brake hydraulic pipe system, it is possible to simplify the work of collecting the vacuum drawing data of the brake hydraulic pipe system with the ABS device, and the leaked part of each test object. And the ultimate vacuum of individual products can be easily checked.

[Brief description of drawings]

FIG. 1 is a schematic overall configuration diagram of a vacuum degree test device of the present invention.

FIG. 2 is a cross-sectional view of essential parts showing a connected state of a wheel cylinder side connection port of a hydraulic unit used in the vacuum degree test apparatus of FIG.

FIG. 3 is a cross-sectional view of a main part of a connected state of a suction opening of a master cylinder used in the vacuum testing apparatus of FIG.

FIG. 4 is a product-by-product comparison graph diagram of a hydraulic unit created on the basis of vacuum drawing data collected from a plurality of test objects by the vacuum degree test apparatus of FIG. 1.

FIG. 5 is a cross-sectional view of essential parts of a brake hydraulic pipe system with an ABS device for a vehicle.

FIG. 6 is a schematic configuration diagram of a brake hydraulic pipe system with an ABS device for a vehicle.

[Explanation of symbols]

 5 Hydraulic unit 6 Hydraulic control valve 7 Hydraulic control valve 8 Hydraulic control valve 9 Hydraulic control valve 18 Master cylinder 19 Wheel cylinder 23 Wheel cylinder side connection port 24 Wheel cylinder side connection port 25 Wheel cylinder side connection port 26 Wheel cylinder side connection port 311 Fixing means 312 Fixing means 321 Vacuum gauge 322 Vacuum gauge 323 Vacuum gauge 324 Vacuum gauge 33 Vacuum pump 34 Pump control device 36 Recording means 39 Pump side joint a Suction opening S Set position P Hydraulic piping

Claims (1)

[Scope of utility model registration request] 1. An AB for reducing a brake hydraulic pressure of a brake hydraulic pipe system which reaches a wheel cylinder from a master cylinder by a hydraulic control valve in a hydraulic unit when the wheels tend to lock.
In a vacuum test apparatus using the S device as an object to be tested, a fixing means for detachably fixing the hydraulic unit to a set position on a base frame, and the wheel cylinder detachably connected to the hydraulic control valve. A vacuum gauge that is detachably connected to the wheel cylinder side connection port of the hydraulic unit, and a vacuum pump that is connected to the suction opening of the master cylinder via a joint and that sucks air in the brake hydraulic pipe system. And a pump control device that controls the operation of the vacuum pump, and a recording unit that records the vacuum value detected by the vacuum gauge.