Line contact friction testing machine with pressure scanning function and pressure detection method

Abstract

The present invention discloses a line-contact friction testing machine with a pressure scanning function and a pressure detection method. The line-contact friction testing machine is provided with a lubricating oil tank installed at the top of the base; a hanger and a loading mechanism are oppositely arranged at both ends of the lubricating oil tank and fixedly installed on the base; a driving motor is installed on the top of the base in a position-adjustable manner, and a friction disc is fixedly installed at the end of the output shaft of the driving motor; a friction plate is hoisted in the lubricating oil tank through the hanger and the loading mechanism and immersed in the lubricating oil, and a detection gap is provided on the friction plate; a constant line-contact friction is formed between the outer peripheral surface of the friction disc and the top surface of the friction plate; the loading mechanism is used to adjust the contact pressure between the friction plate and the friction disc; a pressure sensor is fixedly installed on the friction plate and is opposite to the detection gap. The above-mentioned line-contact friction testing machine can detect the pressure distribution in the lubricating oil film in the contact friction area.

Description

Technical Field

[0001] The present invention relates to the field of friction technology, and particularly relates to a line contact friction testing machine with a pressure scanning function and a pressure detection method. Background Art

[0002] When an object moves along the tangent direction of the contact surface with another object or has a tendency of relative motion of friction, a force that hinders their relative motion will be generated between the contact surfaces of the two objects, and this force is called frictional force. This phenomenon or property between the contact surfaces is called "friction". Friction is both beneficial and harmful, but in most cases it is harmful. For example, the friction during the operation of a machine causes useless loss of energy, shortens the service life of the machine, and reduces the mechanical efficiency. In the prior art, various measures are often taken to reduce friction, such as adding lubricating oil to the machine. When there is a low-pressure area in the lubricating oil in the friction area, gas and steam may be released, that is, bubbles and cavities are formed, which may lead to cavitation corrosion of the friction surface, that is, the phenomenon of friction cavitation occurs. During the friction process, in addition to the friction cavitation phenomenon, a secondary recirculation phenomenon (inflow phenomenon) will occur in the lubricating layer opposite to the friction direction in the convergence area of the contact elastic deformation friction surface.

[0003] In order to further study the generation mechanism of cavitation and inflow phenomena during the friction process, it is necessary to detect the pressure distribution in the lubricating oil film in the friction area. However, there is no equipment in the prior art for detecting the pressure distribution in the lubricating oil film. Summary of the Invention[[ID=1s4]]

[0004] In view of this, the present invention provides a line contact friction testing machine with a pressure scanning function and a pressure detection method, and this line contact friction testing machine can detect the pressure distribution in the lubricating oil film in the contact friction area.

[0005] The line contact friction testing machine with a pressure scanning function includes a base, a lubricating oil tank, a friction plate, a friction disc, a driving motor, a hanger, a loading mechanism, and a pressure sensor;

[0006] The lubricating oil tank is installed on the top of the base;

[0007] The lubricating oil tank is a trough-shaped structure with an open top, and contains lubricating oil and the friction plate inside;

[0008] The hanger and the loading mechanism are oppositely arranged at both ends of the lubricating oil tank and are fixedly installed on the base;

[0009] The driving motor is installed on the top of the base in a position-adjustable manner, and the friction disc is fixedly installed at the end of the output shaft of the driving motor;

[0010] The friction plate is hoisted in the lubricating oil tank through the hanger and the loading mechanism, and is immersed in the lubricating oil. The friction plate is provided with a detection gap, and the length direction of the detection gap is arranged parallel to the axis line of the drive shaft;

[0011] The friction disc is of a cylindrical structure, located at the top of the friction plate, and a line contact friction is formed between the outer peripheral surface and the top surface of the friction plate;

[0012] The loading mechanism is used to adjust the contact pressure between the friction plate and the friction disc;

[0013] The pressure sensor is fixedly installed on the friction plate and is opposite to the detection gap, and is used to detect the pressure of the lubricating oil at the detection gap.

[0014] Furthermore, it further includes a controller and a display device;

[0015] The controller is signal-connected to the drive motor, the pressure sensor and the display device, and is used to control the operation of the drive motor and receive the detection signal of the pressure sensor;

[0016] The display device is used to display the working state information of the drive motor and the pressure value detected by the pressure sensor.

[0017] Furthermore, the hanger includes a support frame, a hinge seat and a hinge plate;

[0018] The support frame is arranged in the vertical direction and the bottom is supported on the top surface of the base;

[0019] The hinge seat is installed on the support frame with adjustable height, and a swing shaft arranged along the length direction of the friction plate is installed at the bottom of the hinge seat;

[0020] The top end of the hinge plate is swingably sleeved on the swing shaft, and the bottom end is hinged to the friction plate through a hinge shaft;

[0021] The hinge shaft is arranged parallel to the output shaft;

[0022] The swing shaft is arranged perpendicular to the hinge shaft.

[0023] Furthermore, the loading mechanism includes a loading cantilever, a fixed pulley, a rope, a loading tray and a load for loading;

[0024] The loading cantilever is arranged in the vertical direction and the bottom is fixedly installed on the base;

[0025] The fixed pulley is rotatably installed on the top of the loading cantilever;

[0026] One end of the rope is fixedly connected to the friction plate, and the other end is connected to a loading tray after passing around the fixed pulley;

[0027] The load is placed in the loading tray and is used to control the contact pressure between the friction plate and the friction disc.

[0028] Furthermore, a cross bar is fixedly installed at the top of the loading cantilever;

[0029] The cross bar is opposite to the swing axis and extends along the axial direction of the swing axis;

[0030] One fixed pulley is installed at each end of the cross bar;

[0031] The part of the rope wound between the two fixed pulleys is coaxially arranged with the swing axis, and is perpendicular and coplanar with the axis line of the output shaft.

[0032] Furthermore, a sliding table is also included and is installed between the driving motor and the base;

[0033] The sliding table includes a stacked bottom plate and top plate. The bottom plate is installed on the top of the base in a position-adjustable manner relative to the base, and the top plate is installed on the top of the bottom plate in a position-adjustable manner relative to the bottom plate;

[0034] The driving motor is installed on the top surface of the top plate.

[0035] Furthermore, a rotational speed sensor installed on the driving motor is also included;

[0036] The rotational speed sensor is signal-connected to the controller and is used to detect the rotational speed of the driving motor.

[0037] Furthermore, the lubricating oil groove, the friction plate and the friction disc are all made of transparent materials.

[0038] Furthermore, a light source installed at the bottom of the lubricating oil groove and a plurality of height-adjustable support feet installed at the bottom of the base are also included;

[0039] The controller is electrically connected to the light source and is used to control the switch of the light source.

[0040] A method for detecting the pressure distribution in the lubricating oil film by using any one of the line contact friction testing machines provided by the above technical solutions includes the following steps:

[0041] Start the driving motor to drive the friction disc to rotate;

[0042] Use the loading mechanism to load the friction plate to generate friction between the friction plate and the friction disc;

[0043] Control the driving motor to move in the radial direction of its output shaft.

[0044] Advantageous effects:

[0045] In the line contact friction testing machine of the present invention, the friction plate is immersed in the lubricating oil in the lubricating oil tank, the friction disc rotates driven by the driving motor, a constant line contact friction is formed between the outer peripheral surface of the friction disc and the template, and a lubricating oil film is formed between the friction disc and the friction plate; a detection gap is provided on the friction plate, and a pressure sensor for detecting the pressure in the lubricating oil film through the detection gap is fixed on the friction plate, and the pressure of the lubricating oil film at the detection gap can be measured by the pressure sensor; when the friction disc rotates and relatively moves along the friction plate at the same time, the detection gap can pass through all the friction areas between the friction disc and the friction plate, so as to realize the pressure scanning of the lubricating oil film in the contact friction area and be able to detect the pressure distribution of the lubricating oil film at various places in the contact friction area.

[0046] In addition, by using the above-mentioned line contact friction testing machine, the contact pressure between the friction plate and the friction disc is controlled by the loading mechanism, and the relative speed between the friction plate and the friction disc can be controlled by adjusting the rotation speed of the driving motor, and the pressure distribution of the lubricating oil film between the friction plate and the friction disc under different pressures and different rotation speeds can be detected. Description of the drawings

[0047] Figure 1 is a schematic three-dimensional structure diagram of the line contact friction testing machine of the present invention;

[0048] Figure 2 is Figure 1 an exploded structure diagram of the line contact friction testing machine in

[0049] Figure 3 is a flow chart of the method for detecting the pressure distribution in the lubricating oil film of the present invention.

[0050] Among them, 1 - base, 2 - lubricating oil tank, 3 - friction plate, 4 - friction disc, 5 - driving motor, 6 - pressure sensor, 7 - controller, 8 - support frame, 9 - hinge seat, 10 - hinge plate, 11 - swing shaft, 12 - hinge shaft, 13 - loading cantilever, 14 - fixed pulley, 15 - rope, 16 - loading tray, 17 - load, 18 - cross bar, 19 - slide table, 20 - bottom plate, 21 - top plate, 22 - rotation speed sensor, 23 - support foot, 24 - detection gap Specific embodiments

[0051] The following combines the drawings and gives examples to describe the present invention in detail.

[0052] Embodiment 1

[0053] This embodiment provides a line contact friction testing machine with a pressure scanning function, as Figure 1 and Figure 2 shown in the structure. The line contact friction testing machine includes a base 1, a lubricating oil tank 2, a friction plate 3, a friction disc 4, a driving motor 5, a hanging bracket, a loading mechanism, and a pressure sensor 6;

[0054] The lubricating oil tank 2 is installed on the top of the base 1; the base 1 serves as the installation foundation of the line contact friction testing machine; for the convenience of adjusting the base 1, a plurality of height-adjustable support feet 23 can also be installed on the top of the base 1. There is a support foot 23 at each of the four corners of the bottom of the base in Figure 1 and Figure 2 , and the height adjustment of the support foot 23 can be achieved through threads;

[0055] The lubricating oil tank 2 is a trough-shaped structure with an open top, and lubricating oil and the friction plate 3 are accommodated inside;

[0056] The hanging bracket and the loading mechanism are oppositely arranged at both ends of the lubricating oil tank 2 and are fixedly installed on the base 1; as shown in Figure 1 and Figure 2 the structure, the hanging bracket is fixedly installed on the base 1 at one end of the lubricating oil tank 2, the loading mechanism is fixedly installed on the base 1 at the other end of the lubricating oil tank 2, and the hanging bracket and the loading mechanism are oppositely arranged at both ends of the lubricating oil tank 2 for hoisting the friction plate 3 into the lubricating oil tank 2; the hanging bracket includes a support frame 8, a hinge seat 9, and a hinge plate 10; the support frame 8 is arranged vertically and the bottom is supported on the top surface of the base 1; the hinge seat 9 is installed on the support frame 8 with adjustable height, and a swing shaft 11 arranged along the length direction of the friction plate 3 is installed at the bottom of the hinge seat 9; the top end of the hinge plate 10 is swingably sleeved on the swing shaft 11, and the bottom end is hinged to the friction plate 3 through a hinge shaft 12; the output shaft of the hinge shaft 12 is arranged in parallel; the swing shaft 11 is perpendicular to the hinge shaft 12; since the hinge seat 9 and the hinge plate 10 are connected through the swing shaft 11, the hinge plate 10 can swing around the swing shaft 11, so that the friction plate 3 can swing with the hinge plate 10, ensuring that the friction disc 4 and the friction plate 3 are always in a constant line contact state; since the hinge plate 10 and the friction plate 3 are hinged through the hinge shaft 12, the friction plate 3 can rotate relative to the hinge shaft 12, which can also ensure the constant line contact between the friction disc 4 and the friction plate 3;

[0057] The driving motor 5 is installed on the top of the base 1 with adjustable position, and a friction disc 4 is fixedly installed at the end of the output shaft of the driving motor 5; as Figure 1 and Figure 2As shown in the structure, the driving motor 5 is installed on the base 1 through the sliding table 19, and the sliding table 19 is installed between the driving motor 5 and the base 1; the sliding table 19 includes a stacked bottom plate 20 and top plate 21, the bottom plate 20 is installed on the top of the base 1 in a position-adjustable manner relative to the base 1, and the top plate 21 is installed on the top of the bottom plate 20 in a position-adjustable manner relative to the bottom plate 20; the driving motor 5 is installed on the top surface of the top plate 21; As Figure 2 As shown in the structure, a lead screw (not shown in the figure) is installed between the bottom plate 20 and the base 1, and the bottom plate 20 is moved relative to the base 1 in the horizontal or vertical direction by rotating the lead screw; a lead screw (not shown in the figure) is installed between the top plate 21 and the bottom plate 20, and the top plate 21 is moved relative to the bottom plate 20 in the vertical or horizontal direction by rotating the lead screw; the position adjustment of the driving motor 5 in the horizontal and vertical directions is achieved by the movement of the top plate 21 relative to the bottom plate 20 and the movement of the bottom plate 20 relative to the base 1; the bottom plate 20 and the top plate 21 of the sliding table 19 can achieve position movement through the lead screw, or other structures can be used to achieve two-way movement;

[0058] The friction plate 3 is hoisted in the lubricating oil tank 2 through a hanger and a loading mechanism and immersed in the lubricating oil. The friction plate 3 is provided with a detection gap 24, and the length direction of the detection gap 24 is arranged parallel to the axis line of the driving shaft;

[0059] The friction disk 4 is of a cylindrical structure, located on the top of the friction plate 3, and a line contact friction is formed between the outer peripheral surface and the top surface of the friction plate 3; As Figure 1 As shown in the structure, the friction disk 4 is installed at the end of the output shaft of the driving motor 5 and rotates synchronously with the output shaft of the driving motor 5, so as to achieve line contact friction with the friction plate 3 under the drive of the driving motor 5, which can be rolling friction and / or sliding friction;

[0060] The loading mechanism is used to adjust the contact pressure between the friction plate 3 and the friction disk 4; As Figure 1 and Figure 2 As shown in the structure, the loading mechanism includes a loading cantilever 13, a fixed pulley 14, a rope 15, a loading tray 16 and a load 17 for loading; the loading cantilever 13 is arranged in the vertical direction and the bottom is fixedly installed on the base 1; the fixed pulley 14 is rotatably installed on the top of the loading cantilever 13; one end of the rope 15 is fixedly connected to the friction plate 3, and the other end is connected to the loading tray 16 after passing around the fixed pulley 14; the load 17 is placed in the loading tray 16 and is used to control the contact pressure between the friction plate 3 and the friction disk 4;

[0061] The pressure sensor 6 is fixedly installed on the friction plate 3 and is opposite to the detection gap 24, and is used to detect the pressure of the lubricating oil at the detection gap 24; the pressure sensor 6 can be installed on the friction plate 3 by means of threads. When friction occurs between the friction plate 3 and the friction disc 4, the lubricating oil flows through the detection gap 24, and the pressure sensor 6 can detect the pressure of the lubricating oil flowing through the detection gap 24, so as to realize the pressure detection in the lubricating oil film.

[0062] During the test of the above-mentioned line contact friction testing machine, the lubricating oil tank 2 is filled with lubricating oil, the friction plate 3 is immersed in the lubricating oil, the driving motor 5 drives the friction disc 4 to rotate, and the friction plate 3 is loaded through the loading mechanism, so that the friction disc 4 installed at the end of the output shaft of the driving motor 5 forms a line contact friction with the friction plate 3. After a stable friction state is formed between the friction disc 4 and the friction plate 3, the driving motor 5 can be controlled to move radially along the output shaft, from one side of the detection gap 24 away from the friction plate 3 to the other side of the detection gap 24. The extending direction of the detection gap 24 is parallel to the axial direction of the output shaft, so as to realize the detection of the lubricating oil film pressure at different positions within the contact friction area between the friction plate 3 and the friction disc 4 through the linear movement of the driving motor 5. Through statistics, the pressure distribution within the contact friction area can be obtained, so as to realize the pressure scanning of the lubricating oil film.

[0063] Since the friction plate 3 is immersed in the lubricating oil in the lubricating oil tank 2, the friction disc 4 rotates under the drive of the driving motor 5, and a line contact friction is formed between the outer peripheral surface of the friction disc 4 and the template, and a lubricating oil film is formed between the friction disc 4 and the friction plate 3; a detection gap 24 is provided on the friction plate 3, and a pressure sensor 6 for detecting the pressure in the lubricating oil film through the detection gap 24 is fixed on the friction plate 3. The pressure of the lubricating oil film at the detection gap 24 can be measured through the pressure sensor 6; when the friction disc 4 moves relative to the friction plate 3 while rotating, the detection gap 24 can pass through all the friction areas between the friction disc 4 and the friction plate 3, so as to realize the pressure scanning of the lubricating oil film within the contact friction area and be able to detect the pressure distribution of the lubricating oil film at various positions within the contact friction area.

[0064] In addition, the above-mentioned line contact friction testing machine controls the contact pressure between the friction plate 3 and the friction disc 4 through the loading mechanism, which can ensure that a constant line contact is always maintained between the friction plate 3 and the friction disc 4, and the relative speed between the friction plate 3 and the friction disc 4 can be controlled by adjusting the rotation speed of the driving motor 5, so that the pressure distribution of the lubricating oil film between the friction plate 3 and the friction disc 4 under different pressures and different rotation speeds can be detected.

[0065] In a specific embodiment, the above-mentioned line contact friction testing machine further includes a controller 7 and a display device; the controller 7 and the display device can be an integral structure; the controller 7 is signal-connected to the drive motor 5, the pressure sensor 6, and the display device, and is used to control the operation of the drive motor 5 and receive the detection signal of the pressure sensor 6; the display device is used to display the working state information of the drive motor 5 and the pressure value detected by the pressure sensor 6.

[0066] As Figure 1 and Figure 2 As shown in the structure, in the loading mechanism for hoisting the friction plate 3 and loading the friction plate 3, a cross bar 18 is fixedly installed at the top of the loading cantilever 13; the cross bar 18 is opposite to the swing shaft 11 and extends along the axial direction of the swing shaft 11; a fixed pulley 14 is installed at each end of the cross bar 18; the part of the rope 15 wound between the two fixed pulleys 14 is coaxially arranged with the swing shaft 11, and is perpendicular and coplanar with the axis line of the output shaft. When the part of the rope 15 wound between the two fixed pulleys 14 is coaxially arranged with the swing shaft 11, and the part of the rope 15 wound between the two fixed pulleys 14 is perpendicular and coplanar with the axis line of the output shaft of the drive motor 5, stable line contact friction can be achieved between the friction plate 3 and the friction disc 4.

[0067] As Figure 1 and Figure 2 As shown in the structure, the above-mentioned line contact friction testing machine further includes a rotational speed sensor 22 installed on the drive motor 5; the rotational speed sensor 22 is signal-connected to the controller 7 and is used to detect the rotational speed of the drive motor 5. The rotational speed of the drive motor 5 can be conveniently detected through the rotational speed sensor 22, and the relative speed between the friction plate 3 and the friction disc 4 can be adjusted through the rotational speed sensor 22 and the controller.

[0068] In order to conveniently observe the friction process between the friction plate 3 and the friction disc 4, the lubricating oil groove 2, the friction plate 3, and the friction disc 4 are all made of transparent materials, and the transparent materials can be light-transmitting materials such as plexiglass and plastics.

[0069] In order to further improve the observation effect, the above-mentioned line contact friction testing machine further includes a light source (not shown in the figure) installed at the bottom of the lubricating oil groove 2; the controller 7 is electrically connected to the light source and is used to control the switch of the light source. The light source installed at the bottom of the lubricating oil groove 2 can emit light. When the lubricating oil groove 2, the friction plate 3, and the friction disc 4 are made of transparent materials, the light emits from the bottom upwards, which is convenient for observing the bubbles and cavities formed between the friction plate 3 and the friction disc 4.

[0070] Embodiment 2

[0071] This embodiment provides a method for detecting the pressure distribution in the lubricating oil film. When detecting the pressure in the lubricating oil film, the above-mentioned line contact friction testing machine provided in the above embodiment is used for reference.Figure 3 , the detection method includes the following steps:

[0072] Step S10, turn on the drive motor 5 to drive the friction disk 4 to rotate;

[0073] Step S20, use the loading mechanism to load the friction plate 3 to generate friction between the friction plate 3 and the friction disk 4;

[0074] Step S30, control the drive motor 5 to move along the radial direction of its output shaft.

[0075] Using the above-mentioned line contact friction testing machine can achieve line contact friction between the friction disk 4 and the friction plate 3. While friction occurs between the friction disk 4 and the friction plate 3, control the friction disk 4 to reciprocate relative to the friction plate 3. Through the above steps, the pressure detection of the lubricating oil film in the sliding friction elastic deformation contact area is realized, the pressure distribution detection in the elastic deformation contact area is completed, and thus the pressure scanning in the friction area is realized.

[0076] In summary, the above is only a preferred embodiment of the present invention and is not used to limit the protection scope of the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A line contact friction testing machine with a pressure scanning function, characterized in that, It includes a base, a lubricating oil tank, a friction plate, a friction disk, a driving motor, a suspension, a loading mechanism, and a pressure sensor; The lubricating oil tank is installed on the top of the base; The lubricating oil tank is a trough-shaped structure with an open top, and lubricating oil and the friction plate are accommodated inside; The suspension and the loading mechanism are oppositely arranged at both ends of the lubricating oil tank and are fixedly installed on the base; The driving motor is installed on the top of the base in a position-adjustable manner, and the friction disk is fixedly installed at the end of the output shaft of the driving motor; The friction plate is hoisted in the lubricating oil tank through the suspension and the loading mechanism and is immersed in the lubricating oil. The friction plate is provided with a detection gap, and the length direction of the detection gap is arranged parallel to the axis of the output shaft; The friction disk is a cylindrical structure, located on the top of the friction plate, and a line contact friction is formed between the outer peripheral surface and the top surface of the friction plate; The loading mechanism is used to adjust the contact pressure between the friction plate and the friction disk; The pressure sensor is fixedly installed on the friction plate and is opposite to the detection gap, and is used to detect the pressure of the lubricating oil at the detection gap; The suspension includes a support frame, a hinge seat, and a hinge plate; The support frame is arranged vertically and the bottom is supported on the top surface of the base; The hinge seat is installed on the support frame with adjustable height, and a swing shaft arranged along the length direction of the friction plate is installed at the bottom of the hinge seat; The top end of the hinge plate is swingably sleeved on the swing shaft, and the bottom end is hinged to the friction plate through a hinge shaft; The hinge shaft is arranged parallel to the output shaft; The swing shaft is arranged perpendicular to the hinge shaft; During operation, the driving motor moves radially along the output shaft, moving from the side away from the detection gap of the friction plate to the other side of the detection gap; The loading mechanism includes a loading cantilever, a fixed pulley, a rope, a loading tray, and a load for loading; The loading cantilever is arranged vertically and the bottom is fixedly installed on the base; The fixed pulley is rotatably installed on the top of the loading cantilever; One end of the rope is fixedly connected to the friction plate, and the other end is connected to a loading tray after passing around the fixed pulley; The load is placed in the loading tray and is used to control the contact pressure between the friction plate and the friction disk; A cross bar is fixedly installed on the top of the loading cantilever; The cross bar is opposite to the swing shaft and extends along the axial direction of the swing shaft; One fixed pulley is installed at each end of the cross bar; The part of the rope wound between the two fixed pulleys is arranged coaxially with the swing shaft and is perpendicular and coplanar with the axis of the output shaft.

2. The line contact friction testing machine according to claim 1, characterized in that, It further includes a controller and a display device; The controller is signal-connected to the driving motor, the pressure sensor, and the display device, and is used to control the operation of the driving motor and receive the detection signal of the pressure sensor; The display device is used to display the working state information of the driving motor and the pressure value detected by the pressure sensor.

3. The line contact friction testing machine according to claim 1, characterized in that, It further includes a slide table installed between the driving motor and the base; The sliding table includes a bottom plate and a top plate stacked thereon. The bottom plate is mounted on the top of the base in a position-adjustable manner relative to the base, and the top plate is mounted on the top of the bottom plate in a position-adjustable manner relative to the bottom plate. The driving motor is mounted on the top surface of the top plate.

4. The line contact friction testing machine according to any one of claims 1-3, characterized in that, It further includes a rotational speed sensor mounted on the driving motor. The rotational speed sensor is signal-connected to the controller (2) and is used to detect the rotational speed of the driving motor.

5. The line contact friction testing machine according to claim 4, wherein, The lubricating oil groove, the friction plate, and the friction disc are all made of transparent materials.

6. The line contact friction testing machine according to claim 5, wherein, It further includes a light source mounted at the bottom of the lubricating oil groove and a plurality of height-adjustable support feet mounted at the bottom of the base. The controller is electrically connected to the light source and is used to control the on / off of the light source.

7. A method for detecting the pressure distribution within a lubricating oil film using the line-contact friction testing machine according to any one of claims 1-6, characterized in that, It includes the following steps: Start the driving motor to drive the friction disc to rotate. Use a loading mechanism to load the friction plate to generate friction between the friction plate and the friction disc. Control the driving motor to move in the radial direction of its output shaft.

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