Device for Direct Force Measurement

Abstract

Device for measuring at least one first force (19) generated within a brake system (20) of a vehicle (9). The brake system (20) comprises at least caliper (16) and at least one brake disc (4). The at least two load pins (12, 13), connecting the caliper (16) and the vehicle (9) are arranged to measure the first force (19). A converting means (21) is arranged to convert a basic force (22) into the first force (19) to be measured.

Claims

1. A device for measuring at least one first force (19) generated within a brake system (20) of a vehicle (9), characterized in that the brake system (20) comprises: at least one caliper (16), and at least one brake disc (4) wherein at least two load pins (12, 13) connect the caliper (16) and the vehicle (9) and the at least two load pins (12,13) are arranged to measure the first force (19); and wherein a converting means (21) is arranged to convert a basic force (22) into the first force (19) to be measured.

2. The device according to claim 1 characterized in that the converting means (21) converts a linear reactive force (23) as a basic force (22) to a torque moment (25) as the first force (19).

3. The device according to claim 2 characterized in that the load pin (12, 13) is a magnetoelastic shear force sensor (26).

4. The device according to claim 1 characterized in that the converting means (21) converts a linear reactive force (23) as a basic force (22) to shear force as the first force (19).

5. The device according to claim 4 characterized in that the load pin (12, 13) is a magnetoelastic shear sensor.

6. The device according to claim 4 characterized in that the converting means (21) is a converting pin (29).

7. The device according to claim 6 characterized in that the converting means (21) converts a braking torque as a basic force (22) to a linear shear force (30) as the first force (19).

8. The device according to claim 1 characterized in that the load pin (12, 13) is a magnetoelastic torque sensor (26).

Description

DESCRIPTION OF THE DRAWINGS

[0051] Further examples and advantageous embodiments of the invention are described in more detail below with reference to the figures.

[0052] FIG. 1, shows a schematic view of a brake piston with brake pad and a brake disc,

[0053] FIG. 2 shows a schematic view of a reactive force in relation to a lever arm,

[0054] FIG. 3 shows a shaft with magnetisations in the area of sensing coils,

[0055] FIG. 4 shows the influence of a reactive linear force on a shear area,

[0056] FIG. 5 shows a load pin with a magnetisation,

[0057] FIG. 6 shows a brake disk of a vehicle,

[0058] FIG. 7 shows a brake disk in rotation,

[0059] FIG. 8 shows one arrow indicating the braking torque and another arrow representing the corresponding reactive force,

[0060] FIG. 9 shows axial reactive forces running in the opposite direction with respect to an imaginary axis and

[0061] FIG. 10 shows a wheel of a vehicle comprising the caliper and the load pins.

DETAILED DESCRIPTION

[0062] FIG. 1 shows a brake piston 1 that is arranged in a brake cylinder 2. A brake pedal (not shown) generates a fluid pressure in the hydraulic fluid in a brake cylinder 2.

[0063] When the fluid pressure is further increased in the brake cylinder 2 the compressed hydraulic fluid pushes the brake piston 1 along a longitudinal axis 3 towards the brake disc 4.

[0064] A brake pad 5 is arranged at the front end 6 of the brake piston 1.

[0065] With an additional increase of the fluid pressure in the brake cylinder 2, the brake pad 5 is pressed against the brake disc 4 and thus the braking process is initiated (not shown).

[0066] The force 24 that pushes the brake piston 1 along the longitudinal axis 3 towards the brake disc 4 is generated within the brake cylinder 2.

[0067] A force 27 applying the brake pad 5 to the brake disc 4 extends along the longitudinal axis 3.

[0068] The force 24 that pushes the brake piston 1 along a longitudinal axis 3 towards the brake disc 4 coincides with the force 27 that presses the brake pad 5 against the brake disc 4. The reactive force, which represents a balance of forces with respect to the force 24 pushing the brake piston 1 along the longitudinal axis 3 and/or with respect to the force 27 pressing the brake pad 5 against the brake disc 4, is represented by the reference numeral 23.

[0069] FIG. 2 shows a schematic view of a reactive force 23 in relation to a lever arm 7. The reactive force 23 shown in FIG. 2 is a linear reactive force 23.

[0070] The lever arm 7 rotates around an axis of rotation, generating a torque moment 25.

[0071] In the illustration of FIG. 2, the reactive force 23 acts at a right angle on the lever arm 7.

[0072] The FIG. 3 shows a magnetoelastic torque sensor. The magnetoelastic torque sensor depicted in FIG. 3 shows how the linear force converted into the torque force, referred to in FIG. 2, is measured.

[0073] In FIG. 3 sensing coils of the torque sensor are represented by reference 12 and 13.

[0074] FIG. 4 shows the influence of a reactive linear force 14 on a shear area 15.

[0075] FIG. 5 shows a load pin 12, 13 with a magnetisation 10, 11. The load pin 12, 13 is arranged on a caliper 16. The load pin 12, 13 has shear areas opposite the caliper 16.

[0076] FIG. 6 shows a brake disk 4 of a vehicle 9. The caliper 16 is located above the brake disk 4. In the FIG. 6 magnetoelastic shear force sensors are represented by reference 12, 13. The magnetoelastic shear force sensors 12, 13 connect the brake disk 4 to the vehicle 9.

[0077] FIG. 7 shows a brake disk 4 in rotation. The caliper 16 is located in the area of the brake disk 4. The load pins 12, 13 can be seen arranged in the caliper 16.

[0078] FIG. 8 is similar in construction to FIG. 6, the difference being that in FIG. 8 arrows 17 and 18 are shown. The arrow 17 indicates the braking torque, applying the brake pad 5 (not shown) to the brake disc 4, being converted into a linear force. On the other hand, the arrow 18 represents the reactive force facing in the opposite direction.

[0079] In the illustration in FIG. 9, axial reactive forces run in the opposite direction with respect to an imaginary axis.

[0080] FIG. 10 shows a wheel of a vehicle 9. The brake disc 4 is arranged in the centre of the wheel.

[0081] The caliper 16 is positioned above the brake disc 4.

[0082] In the illustration of FIG. 10, the load pins 12, 13 are arranged above the caliper 16.

LIST OF REFERENCES

[0083] 1 brake piston [0084] 2 brake cylinder [0085] 3 longitudinal axis [0086] 4 brake disc [0087] 5 brake pad [0088] 6 front end [0089] 7 lever arm [0090] 8 shaft [0091] 9 vehicle [0092] 10 band of magnetisation [0093] 11 band of magnetisation [0094] 12 load pin [0095] 13 load pin [0096] 14 reactive linear force [0097] 15 shear area [0098] 16 caliper [0099] 17 arrow [0100] 18 arrow [0101] 19 first force [0102] 20 brake system [0103] 21 converting means [0104] 22 basic force [0105] 23 reactive force [0106] 24 force pushing the brake pad [0107] 25 torque force [0108] 26 magnetoelastic torque sensor [0109] 27 force applying the brake pad to the brake disc [0110] 28 magnetoelastic shear force [0111] 29 converting pin [0112] 30 linear shear force