CZ20001936A3 - Apparatus for measuring force on a hand brake lever - Google Patents

Abstract

In the present invention, there is disclosed a device having an adapter (4) with an upper support (5) and a lower support (6). The adapter (4) is placed on a vehicle hand brake lever and is further connected to a moment member (8) provided with a moment sensor (11). The moment member (8) is represented by a servomotor (17) shaft (16) and the moment sensor (11) is connected to an electronic evaluation device (15) on the display of which a force, corresponding to the force acting on the vehicle hand brake lever, is read out. The servomotor (17) shaft (16) is also provided with a position sensor (18) connected to a sensor electronic evaluation device (19), which, after the required position of the servomotor (17) shaft (16) is achieved, stops further rotation thereof. The adapter (4) is attached to the servomotor (17) shaft (16) by means of fixing bolts (4.3). In another of alternative embodiments, the moment member (8) is represented by a moment wrench lever and the moment sensor (11) is provided with a scale calibrated in force units pertaining to the hand brake lever handle. In another of the alternative embodiments, the moment member (8) is represented by a moment lever on which bending moment is sensed and converted by an electronic evaluation member to force units pertaining to the hand brake lever handle.

Description

Technical field

The invention relates to a device for measuring the force on a handbrake lever, in particular a handbrake of a passenger car.

BACKGROUND OF THE INVENTION

The force on the handbrake lever is measured to check the tension of the brake cables. The force required to equalize the rope tension is a measure of the correct adjustment of the parking brake. To date, the measurement has been carried out in such a way that the end of the hand brake lever is connected to the tensiometer. Since the measurement reference point moves along a circle, it is difficult to maintain the direction of tension in a plane perpendicular to the handbrake handle and hence measurement accuracy. Particularly during repeated measurements, different values occur. In addition, the measurement is very physically strenuous.

It is therefore an object of the present invention to provide a device by which the contact force on the handbrake lever can be measured much more accurately, easily and with higher repeatability than using tensiometers, substantially reducing the force required on the device and applying force in a suitable operating position or mechanically. .

SUMMARY OF THE INVENTION

The object is achieved by a device for measuring the force on a hand brake lever according to the invention, characterized in that the device is formed by an adapter arranged to be mounted on the hand brake lever, the torque sensor having a torque sensor attached to the adapter. By detecting the respective torque or bending moment, the torque can then be converted into the force exerted on the handbrake lever handle and, in proportion to the torque force exerted, the gauge indicator can be calibrated or calibrated. The torque member and the corresponding torque sensor can be made in several variants. One of these variants is the solution, where the torque member is formed by a torque wrench lever, the torque sensor is in this case placed in a gauge sensing and indicating the resulting bending moment when acting on the end of the torque wrench lever. If the electronic version is used, the torque of the force is sensed on the parking brake lever pin, electronic • 44

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- 2 44 44 The evaluation device calculates the force applied to the handbrake lever handle and this force is read on the display. In another embodiment, the torque member comprises a torque lever provided with at least one torque sensor connected to the evaluation electronic member. bending moment at two points, thus eliminating the grip point. Again, the force evaluated by the electronic member is the force applied to the handbrake lever handle as a function of the bending moment occurring on the torque lever and sensed at a respective point, preferably at least two points. The measurement is considerably less strenuous, since both the torque wrench and the torque lever are used to extend the handbrake lever and to apply force in a suitable operating position. . The electronic evaluation device again evaluates the force applied to the parking brake handle and this force can be read on the display. In another embodiment, the torque bar is formed by a servomotor shaft provided with a torque transducer connected to an electronic evaluation device. The electronic measuring circuit is calibrated in units of force. The torque sensor senses the torque of the actuator shaft and the electronic evaluation device converts the evaluated data again to the force applied to the handbrake lever handle. The servomotor shaft rotates with the adapter in which the parking brake lever is mounted and thus brings the parking brake lever to the respective pivot position. To ensure that the parking brake lever is only rotated to the desired position, it is therefore advantageous if the actuator shaft is provided with a position sensor. In order to perfectly transfer the force to the adapter and the hand brake lever, it is advantageous if the adapter is provided with upper and lower supports which are spaced apart along the hand brake lever.

Overview of the drawings

The device for measuring the force on a handbrake lever according to the invention is shown in the accompanying drawings, in which Fig. 1 shows a device with a torque member formed by a torque lever lever; Fig. 2 shows a device with a torque lever formed by a torque lever; 3 shows a device in which the torque member is formed by a servomotor shaft with a sensing element connected to an electronic evaluation device with a position sensing element.

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DETAILED DESCRIPTION OF THE INVENTION

The parking brake lever 1 is pivoted on the pivot pin 3 and is also provided with a parking brake cable pin 2. An adapter 4 is provided on the parking brake lever 1, provided with an upper support 5 and a lower support 6, which are provided with rubber pads glued on the bearing surfaces of the parking brake lever 1. In the embodiment of FIG. 1, the adapter 4 is provided with a rectangular bore 4.1 into which a torque member 8 consisting of a torque wrench lever 7 is inserted, provided with a handle 9 at the end and further provided with a torque sensor 11 with pointer JO. the force S falling on the handle 12 of the hand brake lever 1. When performing the measurement, the square of the torque wrench lever 7 is slid into the square hole 4.1 of the adapter 4 and by gripping the torque wrench lever 7 the lever and the handbrakes are lifted to the fourth tooth of the ratchet ratchet. On the indicator 10), the force exerted on the hand brake lever handle 12 is subtracted in force units. By applying the same force, a longer lever is formed on the handle 9 given by the sum of the distances A + B from the handbrake pivot 3 to the torque lever lever handle 7 than the lever L, from the pivot pivot 3 to the handbrake lever handle_2 .

In the embodiment of FIG. 2, the adapter 4 is provided with a sleeve 4.4 with an opening 4.2 into which a torque lever 13 with a handle 9 is inserted, a notch on which the torque sensor M for detecting bending moment M is located. At the distance b there is another sensor Π. torque for sensing bending moment M ₂ , where both torque sensors Π are connected to the electronic evaluation element L4. When lifting the torque arm 13 are sensed by the torque sensor Γ1 bending moments M, and M ₂ and fed to an electronic evaluating member 14, wherein the resulting bending moments Mi and M ₂ are converted into corresponding force on the handle 12 with one hand brake lever. The force P applied to the handle 9 of the torque lever 13 is again less than the force S that would be required to be applied to the handle 12 of the hand brake lever 1, since the force P acts on the torque lever 13 at a distance from the pivot 3 brake, on a arm with a distance a + b + c, which is longer than the arm of force S acting at a distance of 1 from the pivot 3 of the hand brake lever pivot to the handle 12 of the hand brake lever 1.

In the embodiment of FIG. 3, the torque member 8 is formed by a shaft 16 of a servomotor 17 provided with torque sensors 11 connected to an electronic evaluation unit.

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444 444 44 444 44 44 equipment 15. The shaft 16 of the actuator 17 is also provided with a position sensor 18 connected to an electronic sensor evaluation device 19. The shaft 16 of the actuator 17 is connected to the adapter 4 Screws 4.3. The rotation of the adapter 4 with the parking brake lever 1 is effected by the rotation of the shaft 16 of the servomotor 17, and the sensor 18 senses a signal to the electronic sensor evaluation device 19 which disconnects the power supply to the servomotor 17. The force on the handle 12 of the handbrake lever 1 corresponding to the sensed torque on the shaft 16 is read on the display of the evaluation electronic device 15.

Claims (7)

PATENT CLAIMS An apparatus for measuring force on a handbrake lever, characterized in that it comprises an adapter (4) arranged to be mounted on the handbrake lever (1), a torque member (8) having a sensor attached to the adapter (4). torque (11). Device according to claim 1, characterized in that the torque member (8) is formed by a torque wrench lever (7). The device according to claim 2, characterized in that the torque wrench lever (7) is provided with a torque sensor (11) with a pointer (10) calibrated per force unit (S) acting on the handle (12) of the hand lever (1) a brake corresponding to the torque generated by the torque member (8). Apparatus according to claim 1, characterized in that the torque member (8) is formed by a torque lever (13) provided with at least one torque sensor (11) connected to the electronic evaluation member (14). Device according to claim 1, characterized in that the torque member (8) is formed by a shaft (16) of the servomotor (17) provided with a torque sensor (11) connected to the evaluation electronic device (15). Device according to claim 5, characterized in that the shaft (16) of the servomotor (17) is provided with a position sensor (18). Device according to claims 1 to 6, characterized in that the adapter (4) is provided with an upper support (5) and a lower support (6) of the parking brake lever (1).