Windscreen wiper rubber strip friction force testing machine
By designing a wiper blade friction tester and employing the dynamic torque difference method to measure friction, the problem of inertial interference and insufficient simulation of pressure changes in existing testing machines has been solved, achieving higher precision friction testing.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- 成都华川电装有限责任公司
- Filing Date
- 2025-04-30
- Publication Date
- 2026-05-08
AI Technical Summary
Existing wiper blade friction testing machines are susceptible to the influence of motion inertia during measurement, leading to data deviations. Furthermore, they cannot dynamically simulate pressure changes during actual use, resulting in insufficient accuracy of measurement results.
A wiper blade friction tester was designed, which adopts a structure of motor, reducer, torque sensor and glass cylinder. The friction force is measured by dynamic torque difference method, eliminating inertial interference, generating friction coefficient curve in real time, and simulating the operation under different speed and pressure.
It improves the accuracy and precision of wiper blade friction testing, eliminates inertial interference, provides more accurate data support, and helps in the design and installation of wiper blades.
Smart Images
Figure CN224216201U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of wiper blade technology, and in particular to a wiper blade friction testing machine. Background Technology
[0002] Existing wiper blade friction testing machines typically measure the friction force by having the wiper blade rub back and forth on the windshield. One method involves a fixed windshield with the wiper blade rubbing against it; in this case, the friction force measurement is easily affected by inertia, leading to data deviation. Another method involves a fixed wiper blade with a rotating windshield, but this cannot dynamically simulate the pressure changes in actual use, resulting in insufficient accuracy. Both of these methods directly measure the wiper blade friction force with large errors and inaccuracies, which is detrimental to wiper blade design and installation. Utility Model Content
[0003] The present invention provides a wiper blade friction tester that eliminates inertial interference and improves the accuracy of wiper blade friction testing.
[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows:
[0005] This utility model discloses a wiper blade friction testing machine, including a bracket, on which a motor, a reducer, and a torque sensor are mounted. The output shaft of the motor is fixedly connected to the input shaft of the reducer, and the output shaft of the reducer is fixedly connected to the input shaft of the torque sensor. A rotating shaft is fixedly connected to the output shaft of the torque sensor, and a glass tube is fixedly mounted on the rotating shaft. The glass tube is coaxial with the rotating shaft. A wiper blade pressing and adjusting mechanism is mounted on the bracket. The wiper blade pressing and adjusting mechanism is provided with a pressure sensor and a wiper blade clamping component. The wiper blade clamping component holds the wiper blade, and the wiping surface of the wiper blade is arranged opposite to the outer wall of the glass tube.
[0006] Furthermore, the diameter of the glass tube is 600 mm.
[0007] Furthermore, the rotational speed of the glass tube is n, where 3rpm≤n≤180rpm.
[0008] Furthermore, when the rear window wiper blade rotates at 30 rpm and its minimum rotation radius is 100 mm, the glass barrel rotates at 5 rpm; when the front window wiper blade rotates at 70 rpm and its maximum rotation radius is 1200 mm, the glass barrel rotates at 140 rpm.
[0009] Furthermore, the wiper blade pressing and adjusting mechanism is located directly above the glass tube.
[0010] Furthermore, the wiper blade pressing and adjusting mechanism includes a slide cylinder, the bracket is equipped with a mounting frame, and the slide cylinder is mounted on the mounting frame.
[0011] Furthermore, the bracket is equipped with a hot air blower, and the air outlet of the hot air blower is oriented towards the glass cylinder.
[0012] Furthermore, the mounting bracket is equipped with an infrared temperature sensor.
[0013] The beneficial effects of this utility model are:
[0014] This application discloses a wiper blade friction testing machine for testing wiper blade friction. The wiper blade to be tested is clamped and fixed on a wiper blade holder, with the wiping surface of the wiper blade facing the outer wall of the glass cylinder. The wiping surface of the wiper blade is not pressed against the outer wall of the glass cylinder. When the motor is started, the output shaft of the motor rotates, driving the input shaft of the reducer to rotate. The output shaft of the reducer rotates, driving the input shaft of the torque sensor to rotate. The output shaft of the torque sensor rotates, driving a rotating shaft to rotate. The rotating shaft rotates, driving the glass cylinder to rotate. The torque sensor measures the torque M1 of the glass cylinder rotating when the wiper blade is not pressed against the outer wall. The motor then stops. By adjusting the wiper blade pressing adjustment mechanism, the wiping surface of the wiper blade is flexibly pressed against the outer wall of the glass cylinder. The motor is then started again, and the torque sensor measures the torque M2 of the glass cylinder rotating when the wiper blade is pressed against the outer wall. The torque difference d(M) = M2 - M is calculated. 1. The friction coefficient of the wiper blade is obtained according to the friction coefficient formula u=d(M) / R / P, where R is the radius of the glass cylinder and P is the pressure of the wiper blade pressed onto the glass cylinder. The radius R of the glass cylinder is pre-selected as a standard size or measured. The pressure P of the wiper blade pressed onto the glass cylinder is measured by a pressure sensor. The motor stops working, and the different pressure values of the wiper blade pressed onto the glass cylinder are adjusted by adjusting the wiper blade pressing adjustment mechanism. Different friction coefficients (u) of the wiper blade are obtained through the friction coefficient formula. The wiper blade friction coefficient curve is generated in real time as the pressure of the wiper blade pressed onto the glass cylinder changes. The calculation accuracy of the friction coefficient is 0.01. The friction force is measured by the dynamic torque difference method to eliminate inertial interference and obtain accurate data, which greatly improves the accuracy of wiper blade friction force testing. It simulates the operation of the wiper blade under different speeds and pressures, and provides assistance for wiper blade design and installation. The cylindrical glass tube has a uniform inertial distribution along the axial direction when it rotates. The uniform rotation of the glass tube improves the accuracy of the pressure sensor in measuring the pressure of the wiper blade pressed onto the glass tube, further enhancing the accuracy of the wiper blade friction test. Attached Figure Description
[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0016] Figure 1 This is a front view of a wiper blade friction testing machine provided in an embodiment of this utility model;
[0017] Figure 2 This is a right view of a wiper blade friction testing machine provided in an embodiment of this utility model.
[0018] Figure label:
[0019] 1. Bracket; 2. Motor; 3. Reducer; 4. Coupling; 5. Torque sensor; 6. Mounting bracket; 7. Slide cylinder; 8. Pressure sensor; 9. Wiper blade holder; 10. Wiper blade; 11. Glass cylinder; 12. Rotary shaft; 13. Infrared temperature sensor; 14. Hot air blower. Detailed Implementation
[0020] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be described in detail below. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other implementation methods obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.
[0021] The present invention will be further described below with reference to the accompanying drawings and embodiments.
[0022] like Figure 1 , Figure 2As shown, this embodiment provides a wiper blade friction testing machine, including a bracket 1. A motor 2, a reducer 3, and a torque sensor 5 are mounted on the bracket 1. The output shaft of the motor 2 is fixedly connected to the input shaft of the reducer 3, and the output shaft of the reducer 3 is fixedly connected to the input shaft (end) of the torque sensor 5. A rotating shaft 12 is fixedly connected to the output shaft (end) of the torque sensor 5. A glass tube 11 is fixedly mounted on the rotating shaft 12, and the glass tube 11 is coaxial with the rotating shaft 12. A wiper blade pressing and adjusting mechanism is mounted on the bracket 1. The wiper blade pressing and adjusting mechanism is equipped with a pressure sensor 8 and a wiper blade clamping member 9. The wiper blade clamping member 9 clamps a wiper blade 10, and the wiping surface of the wiper blade 10 faces the outer wall of the glass tube 11. The motor 2 is powered by an external power source. The bearing housing is fixedly installed on the bracket 1 at the front and rear sides near the glass tube 11 by bolts or welding. The bearing housing is used to install the bearing. The rotating shaft 12 passes through the front bearing, the glass tube 11, and the rear bearing. The rotating shaft 12 is interference-fitted with the bearing and the glass tube 11. The output shaft of motor 2 is fixedly connected to the input shaft of reducer 3 via a key or coupling 4. The output shaft of reducer 3 is fixedly connected to the input shaft of torque sensor 5 via a key or coupling 4 as described in existing technology. The output shaft of torque sensor 5 is fixedly connected to rotating shaft 12 via a key or coupling 4. A torque sensor support is installed on bracket 1. Torque sensor 5 is installed on the torque sensor support. Couplings 4 are installed at both the front and rear ends of torque sensor 5. Couplings 4 are bolted to bracket 1. The output shaft of reducer 3 is fixedly connected to the coupling 4 at the front end of torque sensor 5. The output shaft of torque sensor 5 is fixedly connected to the coupling 4 at the rear end of torque sensor 5. Rotating shaft 12 is fixedly connected to the coupling 4 at the rear end of torque sensor 5. This effectively transmits torque, ensures the accuracy of torque sensor 5 measurement, and ensures the concentricity of torque sensor 5, rotating shaft 12, and glass cylinder 11.
[0023] The wiper blade friction testing machine based on the above structure is used for testing wiper blade friction. The wiper blade 10 to be tested is clamped and fixed on the wiper blade holder 9, with the wiping surface of the wiper blade 10 facing the outer wall of the glass cylinder 11. The wiping surface of the wiper blade 10 is not pressed against the outer wall of the glass cylinder 11. The motor 2 is started, and the output shaft of the motor 2 rotates, driving the input shaft of the reducer 3 to rotate. The output shaft of the reducer 3 rotates, driving the input shaft (end) of the torque sensor 5 to rotate. The output shaft (end) of the torque sensor 5 rotates, driving the rotating shaft 12... Rotation of the shaft 12 causes the glass cylinder 11 to rotate. Torque sensor 5 measures the torque M1 of rotating the glass cylinder 11 when the wiper blade 10 is not pressed against the outer wall of the glass cylinder 11. Motor 2 stops working. By adjusting the wiper blade pressing mechanism, the wiping surface of the wiper blade 10 is flexibly pressed against the outer wall of the glass cylinder 11. Motor 2 is then started. Torque sensor 5 measures the torque M2 of rotating the glass cylinder 11 when the wiper blade 10 is pressed against the outer wall of the glass cylinder 11. The torque of rotating the glass cylinder 11 without the wiper blade 10 being pressed against the outer wall is calculated, along with the torque with the wiper blade 10 being pressed against the outer wall. The difference in torque d(M) = M2 - M1 during the pressing of the wiper blade 10 onto the rotating glass cylinder 11 is used to calculate the friction coefficient of the wiper blade 10 according to the friction coefficient formula u = d(M) / R / P, where R is the radius of the glass cylinder 11 and P is the pressure of the wiper blade 10 pressing onto the glass cylinder 11. The radius R of the glass cylinder 11 is pre-selected as a standard size or measured. The pressure P of the wiper blade 10 pressing onto the glass cylinder 11 is measured by the pressure sensor 8. The motor 2 stops working, and the pressure of the wiper blade 10 pressing onto the glass cylinder 11 is adjusted by adjusting the wiper blade pressing adjustment mechanism. Different pressure values on the glass cylinder 11 are used to derive different friction coefficients (u) of the wiper blade 10 using the friction coefficient formula. A friction coefficient curve of the wiper blade 10 is generated in real time, showing how the pressure of the wiper blade 10 on the glass cylinder 11 changes. The calculation accuracy of the friction coefficient is 0.01. Friction is measured using the dynamic torque difference method, eliminating inertial interference and ensuring accurate data, greatly improving the accuracy of wiper blade friction testing. This simulates the operation of the wiper blade 10 under different speeds and pressures, providing assistance for the design and installation of the wiper blade 10. The cylindrical glass cylinder 11 has a uniform inertial distribution along the axial direction during rotation. The uniform rotation of the glass cylinder 11 improves the accuracy of the pressure sensor's measurement of the pressure of the wiper blade 10 pressed onto the glass cylinder 11, further enhancing the accuracy of wiper blade friction testing.
[0024] As one possible implementation method, such as Figure 1 , Figure 2 As shown, the diameter of the glass tube 11 is 600 mm.
[0025] The glass tube 11 has a diameter of 600mm and is used to test wiper blades with a length of 600mm and below, such as wiper blades with lengths of 600mm, 550mm, 525mm, 500mm, 450mm, 400mm, 350mm, etc., to meet the requirements for testing the friction of wiper blades of different lengths.
[0026] The rotational speed of the glass tube 11 is n, where 3rpm≤n≤180rpm.
[0027] The rotational speed of the glass cylinder 11 ranges from 3 rpm to 180 rpm, such as 3 rpm, 30 rpm, 70 rpm, 100 rpm, 140 rpm, 180 rpm, etc., selected according to different testing requirements. The rotational speed of the rotating shaft 12 is adjusted by the reducer 3, thereby adjusting the rotational speed of the glass cylinder 11. A protective shell is installed on the outside of the torque sensor 5, coupling 4, and bearings.
[0028] As one possible implementation, when the speed of the rear window wiper blade is 30 rpm and the minimum rotation radius of the rear window wiper blade is 100 mm, the speed n of the glass cylinder 11 is (30 / 2*100) / (600 / 2) = 5 rpm; when the speed of the front window wiper blade is 70 rpm and the maximum rotation radius of the front window wiper blade is 1200 mm, the speed n of the glass cylinder 11 is (70 / 2*1200) / (600 / 2) = 140 rpm.
[0029] As one possible implementation method, such as Figure 1 , Figure 2 As shown, the wiper blade pressing and adjusting mechanism is located directly above the glass cylinder 11.
[0030] The wiper blade pressing and adjusting mechanism is located directly above the glass cylinder 11. The wiper blade clamping member 9 is located directly above the glass cylinder 11, and the wiper blade 10 held by the wiper blade clamping member 9 is located directly above the glass cylinder 11, so that the wiping surface of the wiper blade 10 is better pressed onto the glass cylinder 11.
[0031] As one possible implementation method, such as Figure 1 , Figure 2 As shown, the wiper blade pressing and adjusting mechanism includes a slide cylinder 7, the bracket 1 is equipped with a mounting frame 6, and the slide cylinder 7 is mounted on the mounting frame 6.
[0032] The slide cylinder 7 is bolted to the mounting bracket 6. The piston rod of the slide cylinder 7 is bolted or welded to the wiper blade holder 9. The slide cylinder 7 is connected to an external air source, using compressed air as a power source to drive the piston inside the cylinder, achieving high-precision linear motion, which in turn drives the wiper blade holder 9 to press the wiper blade 10 into place. The piston rod of the slide cylinder 7 is bolted to a baffle. The pressure sensor 8 is installed between the top of the wiper blade holder 9 and the baffle. Alternatively, the pressure sensor 8 can be a contact type, fixed between the wiper blade holder 9 and the wiper blade 10, or on the lip of the wiper blade 10.
[0033] As one possible implementation method, such as Figure 1 , Figure 2 As shown, a hot air blower 14 is installed on the bracket 1, and the air outlet of the hot air blower 14 is oriented towards the glass cylinder 11.
[0034] The hot air blower support can be fixedly installed on the bracket 1 by bolts or welding. The hot air blower can be fixedly installed on the hot air blower support by bolts. The hot air blower 14 is powered by an external power source. The hot air blower 14 blows hot air toward the outer wall of the glass cylinder 11 to heat the glass cylinder 11. The temperature is adjusted to the set value to simulate the frictional changes of the wiper blade in different temperature environments, thereby improving the reliability of the test.
[0035] As one possible implementation method, such as Figure 1 , Figure 2 As shown, the mounting bracket 6 is equipped with an infrared temperature sensor 13.
[0036] The infrared temperature sensor bracket is bolted or welded to the mounting bracket 6 near the hot air blower 14. The infrared temperature sensor 13 is bolted to the infrared temperature sensor bracket. The infrared temperature sensor 13 faces the surface of the glass cylinder 11 for rapid, accurate, and stable temperature measurement of the glass cylinder 11.
[0037] The above description is only a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model.
Claims
1. A wiper blade friction testing machine, comprising a bracket (1), characterized in that, The bracket (1) is equipped with a motor (2), a reducer (3), and a torque sensor (5). The output shaft of the motor (2) is fixedly connected to the input shaft of the reducer (3). The output shaft of the reducer (3) is fixedly connected to the input shaft of the torque sensor (5). The output shaft of the torque sensor (5) is fixedly connected to a rotating shaft (12). A glass tube (11) is fixedly installed on the rotating shaft (12). The glass tube (11) is coaxial with the rotating shaft (12). The bracket (1) is equipped with a wiper blade pressing and adjusting mechanism. The wiper blade pressing and adjusting mechanism is equipped with a pressure sensor (8) and a wiper blade clamping member (9). The wiper blade clamping member (9) clamps the wiper blade (10). The wiping surface of the wiper blade (10) is arranged opposite to the outer wall of the glass tube (11).
2. The wiper blade friction testing machine according to claim 1, characterized in that, The glass tube (11) has a diameter of 600 mm.
3. The wiper blade friction testing machine according to claim 1, characterized in that, The rotational speed of the glass tube (11) is n, where 3rpm≤n≤180rpm.
4. The wiper blade friction testing machine according to claim 3, characterized in that, When the speed of the rear window wiper blade is 30 rpm and the minimum rotation radius of the rear window wiper blade is 100 mm, the speed of the glass cylinder (11) is 5 rpm; when the speed of the front window wiper blade is 70 rpm and the maximum rotation radius of the front window wiper blade is 1200 mm, the speed of the glass cylinder (11) is 140 rpm.
5. A wiper blade friction testing machine according to claim 1, characterized in that, The wiper blade pressing and adjusting mechanism is located directly above the glass cylinder (11).
6. The wiper blade friction testing machine according to claim 5, characterized in that, The wiper blade pressing and adjusting mechanism includes a slide cylinder (7), and the bracket (1) is equipped with a mounting bracket (6). The slide cylinder (7) is mounted on the mounting bracket (6).
7. A wiper blade friction testing machine according to claim 6, characterized in that, The bracket (1) is equipped with a hot air blower (14), and the air outlet of the hot air blower (14) is set towards the glass cylinder (11).
8. A wiper blade friction testing machine according to claim 7, characterized in that, The mounting bracket (6) is equipped with an infrared temperature sensor (13).