JPH0217322Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a residual air determination device in a brake hydraulic mechanism of an automobile, which allows the residual air in the brake hydraulic mechanism to be checked easily and quickly. If air gets into the brake system pipes or equipment, it will cause a so-called spongy phenomenon and the brakes will not work. After filling, so-called air bleeding is performed, and residual air is checked. Conventionally, when determining the amount of residual air in such a brake hydraulic mechanism, a method that relied on braking force determination using a brake tester or the operator's intuition was used, but in the former case, the amount of residual air This results in a judgment of the entire brake mechanism rather than a judgment of the quantity, and in the latter case, the judgment results vary depending on the operator, and it is unreliable as it takes a long time. There was a problem that it could not be applied to automobile assembly lines, which require quick judgment. The present invention solves these conventional problems, makes it possible to check the amount of residual air easily and quickly, and can be adapted to any type or model of car, making it suitable for use on automobile assembly lines. It is an object of the present invention to provide a residual air determination device for a brake hydraulic mechanism of an automobile, which is configured to be small and lightweight, making it easy to carry and handle. For this reason, the residual air determination device for an automobile brake hydraulic system of the present invention has an arm that is extendable and retractable via a movable rod and an arm that is equipped with a load detector, and is rotatably pivoted to the container frame. , an engagement member capable of engaging with a brake pedal and a cross member protruding to the front floor of the automobile is rotatably connected to the ends of these arms, and a stroke detector for detecting displacement of the movable rod is attached to the arm. is installed, and the output signals of this stroke detector and load detector can be transmitted into the judgment device, while the reference stroke of the brake pedal and the reference stroke of the brake pedal are installed in the judgment device.
A memory circuit is provided that stores each value of the reference pedal force corresponding to the stroke, and the signal from the stroke detector is input to the circuit to output the corresponding reference pedal force, and this output and the signal from the load detector are combined. The feature is that the judgment is made by comparison. Hereinafter, one embodiment of the present invention will be described with reference to the drawings. In FIGS. 1 to 4, 1 is a detector for detecting the stroke and pedal force of a brake pedal, and is equipped with a frame 2 having a substantially U-shaped cross section; Its bent bottom 2a
The end of a U-shaped grip 3 is fixed on the back side of the container frame 2, and between the bent pieces 2b, 2b of the container frame 2 ,
The base end portions of the pair of left and right arms 4 and 5 are rotatably connected via a pin 6. Among these, the arm 4 is made of, for example, a hollow cylindrical body, and a movable rod 7 is accommodated therein so as to be able to be moved in and out.A spring 8 is stretched between the movable rod 7 and the pin 6, and the restoring force is applied to the arm 4. The movable rod 7 is normally urged inward of the arm 4. Furthermore, a stroke detector 9 is attached to the tip of the arm 4 and outputs current or voltage by converting the displacement into impedance such as electric resistance according to the displacement of the movable rod 7 in and out. The signal is sent to a determiner to be described later. In this embodiment, the stroke detector 9
A known slider is used, to which a DC voltage is applied. Reference numeral 10 denotes an engaging member made of, for example, a steel plate bent into a substantially U-shaped cross section, and a pin 1 is inserted between a pair of connecting pieces 11, 11
2, and is pivotally connected to the tip of the movable rod 7 so that a brake pedal 13 of an automobile can be received inside thereof. The arm 5 is made of a short and small cylindrical body, and a sub-arm 14 having approximately the same length as the arm 5 is connected to the tip of the sub-arm 14 via a load cell 15, which will be described later, as a load detector. Shape engaging member 1
6 is rotatably connected via a pair of connecting pieces 17, 17 and a pin 18, and a cross member 20 protruding to the front floor 19 of the automobile is received inside thereof. The load cell 15 is equipped with a low tensile strain meter element on its pressure sensitive part, and the stress strain detected by the element is electrically converted and the output voltage or current is transferred to the pedal force meter 21 which makes full use of the low tensile strain meter. The brake pedal 13 is sent to the brake pedal 13 to instruct the depression force of the brake pedal 13. Reference numeral 22 denotes a determining device which incorporates the aforementioned pedal force meter 21, a memory circuit 23, each amplifier, an operational amplifier 24 as a comparator, etc., and is constructed as follows. That is, the load cell 15 and the pedal force meter 2 are included in the judger 22 .
1 and a memory circuit 23, from which a signal corresponding to the corresponding standard pedal force is read out from the stored pedal forces according to the output of the stroke detector 9 and output 26. A control circuit 28 is provided which has a microcomputer 27 configured to do this, and the control circuit 28 is connected to the output terminal of the stroke detector 9. The outputs of these circuits 25 and 28 are input to the operational amplifier 24, and compared, the display lamps 29 and 30 are turned on. The memory circuit 23 is constituted by a ROM that makes full use of, for example, an IC memory and has a fast readout speed and can be made compact and lightweight. are stored, a reference stroke 31 at the same level or corresponding to the output of the stroke detector 9 is searched, and the stroke 31
The standard pedal force 32 is read out based on the output 2.
6, and these standard values are as follows. In other words, Fig. 4 is a graph of the relationship between the brake pedal stroke and the pedal force, and the curves a, b, and c in the figure indicate the amount of residual air in the brake hydraulic mechanism. The cases of 0CC, 0.5CC, and 1CC are shown, and this graph shows that each curve has its own depression force value depending on the stroke of the brake pedal. Therefore, in relation to the braking force of the brake, a permissible limit amount of residual air in the brake hydraulic mechanism is determined, and the respective numerical values of the brake pedal stroke and depression force at the limit amount are stored as reference values. , the reference stroke 31 and the reference pedal force 32 mentioned above.
Therefore, based on the reference pedal force 32 corresponding to the reference stroke 31, this pedal force 32 and the load cell 1
By comparing the pedal force actually measured through 5 and determining pass/fail based on the magnitude, the amount of residual air in the brake system of the inspected vehicle can be quantitatively determined. For example, if the c curve in the figure is the characteristic curve of the allowable limit amount of residual air, the standard pedal force will be 22 kg for a standard stroke of 60 mm, so the actual measurement of the pedal force by the load cell 15 when the stroke is set to the same value. If the value is greater than the reference pedal force, it is determined to pass, and if it is smaller, it is determined to be rejected. In addition, 33 and 34 in the figure are stroke detectors 9.
and a conductor connecting the load cell 15 and the judge 22 , 35 is a pedal arm, 36 is a front panel, 37 is a push rod, 38 is a master cylinder, 39 is a supply tank, 40 and 40 are container frames 2
A stopper protrudes outward from the bent bottom 2a of the arm 4 and 5 to restrict the rotation angle of the arms 4 and 5 in the outward direction, and a pressure-sensitive switch (not shown), for example, is attached to the inner end surface of the stopper. Both arms 4 and 5
It is desirable to enable the output of the stroke detector 9 to be transmitted to the determiner 22 only when the stroke detector 9 comes into contact with the stoppers 40, 40 and presses each of the switches. In the determination device configured in this way, the conductors 33 and 34 are usually pulled out from the determiner 22, and the detector 1 and the determiner 22 are separated, so that the handling of these devices is facilitated. is arm 4,
5. Since the engaging members 10 and 16 are freely foldable, they can be made compact, further enhancing the above-mentioned advantages. Next, when using this determination device to determine whether the residual air amount in the brake hydraulic system of an automobile is acceptable, connect the conductors 33 and 34 to the determination device 22 , and
As shown in the figure, the engaging member 10 provided on one arm 4 side of the detector 1 is fitted into the brake pedal 13, and the engaging member 16 provided on the other arm 5 side is fitted into the cross member 20. In this case, the distance between the brake pedal 13 and the cross member 20 varies depending on the vehicle type and model, but in that case, the rotation angles of both arms 4 and 5 are adjusted as appropriate.
Furthermore, the problem can be dealt with by moving the movable rod 7 in and out of the arm 4, thereby causing the arm 4 to extend and contract. Moreover, at this time, since the movable rod 7 can be freely and quickly displaced via the spring 8, the arm 4 can be extended and contracted reliably and quickly, and no special operation is required for this purpose. After attaching the engaging members 10 and 16 in this manner, hold the grip portion 3 of the detector 1 and push it down until the arms 4 and 5 come into contact with the stopper 40 as shown in FIG. Spread it out and hold it as shown. In such a state, the movable rod 7 moves outward against the restoring force of the spring 8, quickly responding to the variation in the distance between the brake pedal 13 and the cross member 20, and compensating for the variation. At the same time, the arm 4 is moved in and out of the arm 4 accordingly. Furthermore, as the arms 4 and 5 come into contact with the stopper 40, both of the pressure-sensitive switches that sense this are turned on, so that the displacement of the movable rod 7 is caused by the brake.
The detector 9 detects the stroke S of the pedal 13 and outputs a signal proportional to the magnitude of the stroke S.
8 is input. The stroke signal is input into a memory circuit 23 in a microcomputer 27 connected to a control circuit 28, a reference stroke 31 having the same value or corresponding to the stroke signal is searched for in the circuit 23, and further, based on this reference stroke 31, A reference pedal force 32 is read out, and this reference pedal force 32 is output 26 and input to the operational amplifier 24 . On the other hand, with the arms 4 and 5 in the expanded state, the reaction force of the brake pedal 13 acts on the low drag linear strain meter element built into the load cell 15 via the arms 4 and 5, and the stress strain is detected. A signal proportional to the distortion is output, and this signal is input to the pedal force measuring circuit 25. Therefore, the pedal force meter 21 connected to the circuit 25 operates in proportion to the output of the load cell 15,
While instructing the depression force value of the brake pedal 13,
The signal from the load cell 15 is input to the operational amplifier 24 . As a result, the operational amplifier 24 compares the magnitudes of the two input signals, and the load cell 1
If the signal from 5 is larger than the signal corresponding to the standard pedal force 32, it is determined that the amount of residual air in the brake hydraulic mechanism is within the permissible limit, and the indicator lamp 29 lights up, for example, to notify that the brake has passed. If the signal from the load cell 15 is smaller than the signal corresponding to the standard pedal force 32, it is determined that the residual air amount exceeds the allowable limit, and the indicator lamp 3
0 lights up to notify you of failure. Therefore, the operator inspects and maintains the vehicle that has been determined to be rejected, thoroughly bleeds out the air, and then uses the determination device again to confirm whether the vehicle has passed or failed. On the other hand, in an automobile repair shop, in addition to the above-mentioned air bleeding, inspections are conducted for areas requiring maintenance, such as brake pipes, fluid leakage due to cracks in the brake fluid tank, and wear on the brake shoe. After making the pass/fail judgment in this way, the engaging member 1
0,16 from the brake pedal 13 and cross member 20, the stroke detector 9
Then, the pressure sensitive switch is turned off, and the load cell 15 is also turned off. In this removal operation, the engaging members 10 and 16 can be simply hooked and removed, so this kind of attachment and detachment operation can be performed easily and quickly as well as the attachment operation, and the determination result can be obtained quickly. This makes it suitable for use on assembly lines. In the above-mentioned embodiment, the movable rod 7 was slidably provided in the arm 4 as a means for extending and contracting the arm 4, but the arrangement is not limited to this example, and it is also possible to extend and contract by using, for example, a screw mechanism. It is. As described above, the residual air determination device for an automobile brake hydraulic system of the present invention consists of a pair of arms rotatably connected to an engaging member that can engage a brake pedal and a cross member protruding from the front floor. Therefore, since the residual air amount in the brake hydraulic mechanism is determined, the engagement member can be attached and detached easily and quickly, and the determination result can be obtained quickly, making it suitable for automobile assembly lines. It has a suitable effect when used in In addition, in the present invention, a pair of arms are rotatably connected to the container frame, and one arm is made extendable and retractable via a movable rod, making it possible to freely change the opening interval of the engaging member. It can be quickly adapted to the types and models of automobiles to be used, and is small, lightweight, and has a simple structure, making it easy to handle and manufacture. Furthermore, since the present invention uses various detectors and compares them with reference values to determine pass/fail, it is possible to obtain higher reliability than conventional determination methods of this type.

[Brief explanation of the drawing]

Figure 1 is a front view showing one embodiment of the present invention;
The figure is a front view showing the state in which the present invention is used, and a part is shown in cross section. Figure 3 is an explanatory diagram showing the judgment system of the present invention, and Figure 4 is the relationship between brake pedal stroke and depression force. FIG. 5 is a front view showing the state of use of the present invention, and a part thereof is shown in cross section. 2 ... Instrument frame, 4, 5... Arm, 7... Movable rod, 9... Stroke detector, 10, 16... Engagement member, 13... Brake pedal, 15... Load detector, 19 ...Front floor, 20...Cross member, 22 ...Judgment device, 23...Memory circuit, 31...Reference stroke, 32...Reference pedal force.

Claims (1)

[Scope of utility model registration request] An arm 4 that is extendable and retractable via a movable rod 7;
The arm 5 to which the load detector 15 is attached is rotatably connected to the instrument frame 2 , and the ends of these arms 4 and 5 engage with the brake pedal 13 and a cross member 20 that protrudes into the front floor 19 of the automobile. rotatably connecting the matable engaging members 10 and 16;
A stroke detector 9 for detecting the displacement of the movable rod 7 is attached to the arm 4, and the output signals of the stroke detector 9 and the load detector 15 can be transmitted to the determiner 22 . is provided with a memory circuit 23 that stores the reference stroke 31 of the brake pedal 13 and the reference pedal force 32 corresponding to the stroke 31, and inputs the signal from the stroke detector 9 to the circuit 23 to store the corresponding reference value. A residual air determination device in a brake hydraulic mechanism of an automobile, characterized in that a pedal force 32 is output, and a determination is made by comparing this output with a signal from the load detector 15.