CN114704552A - Current-carrying solid film lubrication bearing and friction control method thereof - Google Patents

Abstract

The invention discloses a current-carrying solid film lubrication bearing and a friction force control method thereof. The invention replaces the grease injected into the grease lubricated bearing in the prior art by the conductive film layer to realize the lubrication in the current-carrying solid film lubricated bearing; because the conductive film layer is different from grease and has good conductivity, the conductive film layer is arranged on at least one contact surface in the current-carrying solid film lubrication bearing, so that the conductive film layer isolates two adjacent members, and the charge accumulation on the contact surface of the conductive film layer is avoided, the breakdown phenomenon of the two members indirectly contacted through the conductive film layer in the current-carrying solid film lubrication bearing is avoided, and the damage occurrence rate of the surface of the current-carrying solid film lubrication bearing member is effectively reduced.

Description

A current-carrying solid film lubricated bearing and its friction control method

technical field

The invention relates to the technical field of current-carrying solid thin film lubricated bearings, in particular to a current-carrying solid thin film lubricated bearing and a method for controlling friction force thereof.

Background technique

With the rapid development of electric vehicles and high-speed railways, the friction and wear phenomenon under current-carrying conditions has become a problem that must be considered in various transmission parts. Especially for the grease-lubricated bearings in electric vehicles, because they work under complex electric field conditions, it is easy to accumulate electric charges at the grease in the grease-lubricated bearings. With the accumulation of electric charges, breakdown will occur, resulting in a decline in the performance of the lubricating oil. It will also cause damage to the surfaces of various components of the grease lubricated bearing.

Therefore, the existing technology still needs to be improved and developed.

SUMMARY OF THE INVENTION

The technical problem to be solved by the present invention is to provide a current-carrying solid thin film lubricated bearing and a friction control method thereof, aiming at reducing the occurrence rate of the breakdown phenomenon caused by the accumulation of electric charges on the surface of the bearing member.

The technical scheme adopted by the present invention to solve the technical problem is as follows:

A current-carrying solid thin film lubricated bearing, wherein at least one contact surface of the current-carrying solid thin film lubricated bearing is provided with a conductive film layer.

The current-carrying solid thin film lubricated bearing includes an inner ring and an outer ring sleeved with each other, and a plurality of rollers arranged between the inner ring and the outer ring.

In the current-carrying solid thin film lubricated bearing, the conductive film layer is provided on both the outer surface of the inner ring and the inner surface of the outer ring.

In the current-carrying solid thin film lubricated bearing, the conductive film layer is provided on the surface of the roller.

In the current-carrying solid thin film lubricated bearing, the conductive film layer is provided on the surface of the roller, the outer surface of the inner ring and the inner surface of the outer ring.

The current-carrying solid film lubricated bearing further comprises a first power source, the first end of the first power source is electrically connected to the outer ring; when assembled with the inner ring through a transmission shaft, the first power source The second end of the drive shaft is electrically connected, so that a closed-loop current loop is formed between the first power source, the outer ring, the roller, the inner ring and the drive shaft.

The current-carrying solid thin film lubricated bearing comprises a journal, a bearing bush and a bearing seat which are sleeved in sequence from the inside to the outside; the surface of the journal and/or the surface of the bearing bush is provided with the conductive film layer.

The current-carrying solid film lubricated bearing further includes a second power source, one end of the second power source is electrically connected to the bearing seat; when assembled with the journal through the drive shaft, the first power source of the second power source is The two ends are electrically connected with the transmission shaft, so that a closed-loop current loop is formed between the second power source, the bearing seat, the bearing bush and the journal.

A friction force control method based on the current-carrying solid thin film lubricated bearing, comprising the steps of:

Sleeve the current-carrying solid film lubricated bearing on the drive shaft;

electrically connecting the first end of the first power source with the outer ring, and electrically connecting the second end of the first power source with the transmission shaft;

Turn on the power and drive the drive shaft to rotate.

Beneficial effects: the present invention realizes the lubrication in the current-carrying solid thin film lubricated bearing by replacing the grease injected into the grease lubricated bearing in the prior art by the conductive film layer; The conductive film layer is arranged on at least one contact surface of the current-carrying solid thin film lubricated bearing, so that the conductive film layer isolates two adjacent components, while avoiding having the conductive film layer The charge accumulation on the contact surface of the current-carrying solid film lubricated bearing can avoid the breakdown phenomenon of the two components indirectly contacted by the conductive film layer in the current-carrying solid film lubricated bearing, and effectively reduce the damage to the surface of the current-carrying solid film lubricated bearing component. incidence.

Description of drawings

1 is a schematic structural diagram of the current-carrying solid thin film lubricated bearing when only the surface of the roller has a conductive film layer in the present invention;

2 is a schematic structural diagram of the current-carrying solid film lubricated bearing when the outer surface of the inner ring and the inner surface of the outer ring both have conductive film layers in the present invention;

3 is a schematic structural diagram of the current-carrying solid film lubricated bearing when the outer surface of the inner ring, the surface of the roller and the inner surface of the outer ring all have conductive film layers in the present invention;

4 is a schematic structural diagram of a current-carrying solid film lubricated bearing in the second embodiment of the present invention;

Fig. 5 is the control curve of electric current to described current-carrying solid film lubricated bearing internal friction force in the present invention;

6 is a control curve of the current-carrying solid film lubricated bearing inner friction stability of the current-carrying solid thin-film lubricated bearing when the current is not energized in the present invention;

FIG. 7 is a control curve of the current-carrying solid film lubricated bearing inner friction stability under the condition of electrification in the present invention.

Detailed ways

In order to make the objectives, technical solutions and advantages of the present invention clearer and clearer, the present invention will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are only used to explain the present invention, but not to limit the present invention.

The present invention provides a current-carrying solid thin film lubricated bearing, as shown in FIGS. 1-3 , at least one contact surface of the current-carrying solid thin film lubricated bearing is provided with a conductive film layer 1 . The present invention realizes the lubrication in the current-carrying solid thin film lubricated bearing by replacing the grease injected into the grease lubricated bearing in the prior art by the conductive film layer 1; since the conductive film layer 1 is different from the grease, it has good Conductivity, by arranging the conductive film layer 1 on at least one contact surface of the current-carrying solid thin film lubricated bearing, so that the conductive film layer 1 isolates two adjacent components, while avoiding having the conductive film The charge accumulation on the contact surface of the layer 1, thereby avoiding the breakdown phenomenon of the two components in the current-carrying solid thin film lubricated bearing that are indirectly in contact with the conductive film layer 1, and effectively reducing the current-carrying solid thin film lubricated bearing components. Incidence of surface damage.

In the present invention, the conductive film layer 1 is a solid film prepared by uniform deposition on at least one contact surface of the current-carrying solid film lubricated bearing by a coating device, and ensures that the current-carrying solid film lubricated bearing is connected with the conductive film. The two adjacent members of the film layer 1 are not in direct contact with each other, but are separated by the conductive film layer 1 to indirectly contact each other through the conductive film layer 1 .

In a specific embodiment of the present invention, the conductive film layer 1 is a carbon film layer. It should be noted that the present invention is not limited to the use of carbon film layers to separate the direct contact between the various components in the current-carrying solid thin-film lubricated bearing, any conductive and can be deposited on the current-carrying solid thin film lubricated bearing. The thin film on the surface of the components can be used as the conductive film layer 1 for lubricating and conducting electricity in the present invention.

In the first embodiment of the present invention, as shown in FIG. 1 , FIG. 2 and FIG. 3 , the current-carrying solid thin film lubricated bearing includes an inner ring 2 and an outer ring 3 that are sleeved together, and an inner ring 2 and an outer ring 3 arranged on the inner ring 2 and the The several rollers 4 between the outer rings 3, that is, the current-carrying solid film lubricated bearing are rolling bearings.

In this embodiment, the first implementation

As shown in FIG. 1, the surface of the roller 4 is provided with the conductive film layer 1, so that the roller 4 and the inner ring 2 are isolated by the conductive film layer 1, and the roller The sub 4 and the outer ring 3 are also isolated by the conductive film layer 1 . The electrical conductivity of the contact surface between the roller 4 and the inner ring 2 is improved by the conductive film layer 1, and the electrical conductivity of the contact surface between the roller 4 and the outer ring 3 is improved at the same time, so as to avoid electric charges The accumulation between the inner ring 2 and the roller 4, and the accumulation of electric charge between the roller 4 and the inner ring 2, thereby preventing the roller 4 and the inner ring 2 from accumulating The contact surface between the rollers 4 and the outer ring 3 is damaged due to the breakdown phenomenon.

Embodiment 2 in this embodiment

As shown in FIG. 2 , both the outer surface of the inner ring 2 and the inner surface of the outer ring 3 are provided with the conductive film layer 1 , so that the inner ring 2 and the roller 4 are surrounded by The conductive film layer 1 is isolated from each other, and the outer ring 3 and the roller 4 are also isolated by the conductive film layer 1 . The electrical conductivity of the contact surface between the roller 4 and the inner ring 2 and the contact surface between the roller 4 and the outer ring 3 is improved by the conductive film layer 1, so as to avoid electric charges on the roller between the roller 4 and the inner ring 2, and between the roller 4 and the outer ring 3, so as to avoid the contact surface between the roller 4 and the inner ring 2, and the roller The contact surface between 4 and the outer ring 3 is damaged due to the breakdown phenomenon, which effectively reduces the occurrence rate of the breakdown phenomenon of the current-carrying solid film lubricated bearing.

Further, the conductive film layer 1 may be provided on the entire surface of the inner ring 2 and the entire surface of the outer ring 3 .

In this embodiment, the third implementation

As shown in FIG. 3 , the outer surface of the inner ring 2 , the surface of the roller 4 and the inner surface of the outer ring 3 are all provided with the conductive film layer 1 , so that the inner ring 2 and the The contact of the roller 4 is the contact between the conductive film layer 1 and the conductive film layer 1, and the contact between the roller 4 and the outer ring 3 is also the contact between the conductive film layer 1 and the conductive film layer 1 . The conductive film layer 1 enhances the electrical conductivity of the contact surface between the inner ring 2 and the roller 4, and at the same time improves the electrical conductivity of the contact surface between the roller 4 and the outer ring 3 to avoid electric charges The accumulation between the inner ring 2 and the roller 4, and the accumulation of electric charge between the roller 4 and the inner ring 2, so as to avoid the outer surface of the inner ring 2, the roller 4 The surface of the outer ring 3 and the inner surface of the outer ring 3 are damaged.

Further, the conductive film layer 1 may be provided on the entire surface of the inner ring 2 , the entire surface of the roller 4 and the entire surface of the outer ring 3 .

For the current-carrying solid film lubricated bearing in this embodiment, as shown in FIG. 3 , the transmission shaft 8 is assembled with the inner ring 2 , that is, the transmission shaft 8 is inserted into the central hole of the inner ring 2 , and the The transmission shaft 8 is installed in cooperation with the inner surface of the inner ring 2 , so that when the transmission shaft 8 rotates, the inner ring 2 and the rollers 4 can be driven to rotate. The current-carrying solid film lubricated bearing also includes a first power source 9; the first power source 9 is electrically connected to the transmission shaft 8 and the outer ring 3 respectively, and makes the first power source 9, the outer ring 3. A closed-loop current loop is formed between the rollers 4 , the outer ring 3 and the transmission shaft 8 .

The outer ring 3 is fixed, the first power supply 9 is turned on while the transmission shaft 8 is rotated, and the transmission shaft 8 drives the current-carrying solid film lubricated bearing to run (the outer ring 3 is stationary, the inner When the ring 2 and the roller 4 rotate, that is, the outer ring 3 is a stationary part, and the inner ring 2 and the roller 4 are rotating parts), the load carrying of the current-carrying solid film lubricated bearing can be realized. flow control. By changing the magnitude of the current of the first power supply 9, the friction regulation of the current-carrying solid thin film lubricated bearing under different current intensities can be realized. In the present invention, through the current loop, the frictional force of the contact surface between the rotating part and the non-moving part can be significantly reduced during the operation of the current-carrying solid thin film lubricated bearing.

Based on the current-carrying solid film lubricated bearing described in any one of the above, the present invention also provides a friction control method, which specifically includes the following steps:

S100. Sleeve the current-carrying solid film lubricated bearing on the transmission shaft;

S200, electrically connecting the first end of the first power source to the outer ring, and the second end to the drive shaft, so that a closed-loop current loop is formed between the first power source, the drive shaft, the inner ring, the roller, and the outer ring;

S300 , turning on the first power source and driving the transmission shaft to rotate, the current-carrying solid film lubricated bearing operates, and adjusting the output current of the first power source, so as to realize the control and adjustment of the friction force of the current-carrying solid film lubricated bearing.

Further, the friction test process of the current-carrying solid film lubricated bearing is as follows:

Connect the outer ring 3 of the current-carrying solid film lubricated bearing with the tensile force measuring device, so that the friction moment between the roller 4 and the outer ring 3 is balanced with the moment of the acting force between the tensile force measuring device and the outer ring;

The tensile force measuring device is connected with the outer ring 3 . When the transmission shaft 8 rotates to drive the inner ring 2 and the roller 4 to rotate, the roller 4 generates the first force on the outer ring 3 . a force, and the tensile force measuring device generates a second force on the outer ring 3, the moment of the first force is balanced with the moment of the second force to ensure that the outer ring 3 is The tension measuring device is positioned. Specifically, the connecting line between the connection point of the tensile force measuring device and the outer ring 3 to the center point of the roller 4 is perpendicular to the center axis of the transmission shaft 8, so that the outer ring 3 is at the Under the positioning action of the tensile force measuring device, a static state is maintained, and the friction torque generated by the mutual friction between the roller 4 and the outer ring 3 is balanced with the torque generated by the tensile force measuring device. By reading the reading of the tensile force measuring device, the magnitude F of the acting force on the outer ring 3 when the roller 4 rotates relative to the outer ring 3 can be obtained. In a specific embodiment, the tensile force measuring device is a tensile force sensor.

Specifically, the first power supply 9 is turned on to increase the electric field between the roller 4 and the outer ring 3 ; the transmission shaft 8 is driven to rotate, so that the transmission shaft drives the inner ring 2 to rotate. The roller 4 rotates, while the outer ring 3 remains stationary under the positioning action of the tensile force measuring device.

Obtain the reading of the tensile force measuring device; according to the reading and the distance from the connection point between the outer ring and the tensile force measuring device to the central axis of the transmission shaft, calculate the magnitude of the frictional force between the roller and the outer ring;

Specifically, by measuring the distance L from the connection point between the tensile force measurement device and the outer ring 3 to the central axis of the transmission shaft, the moment arm generated by the tensile force measurement device is obtained; according to torque=force*force Arm, and the reading F of the tensile force measuring device can obtain the torque generated by the tensile force measuring device, and then obtain the friction torque generated by the contact surface of the conductive film layer 1 between the roller 4 and the outer ring 3, thereby Calculation: When the roller 4 rotates relative to the outer ring 3, the size of the friction force F' generated by the contact surface of the conductive film layer 1 between the roller 4 and the outer ring 3 (F*L=F '*L', where L' is the radius of the roller 4).

Test Example 1, as shown in Figure 5, Figure 5 shows the control curve of the current on the friction force in the current-carrying solid film lubricated bearing; the abscissa in the figure is the time (s), and the ordinate is the friction force (N) . During the test, the outer ring 3 is connected to the tensile force measuring device, so that the outer ring 3 remains stationary, the first power supply 9 is turned on and the transmission shaft is rotated, so as to obtain the roller from the test. 4. The friction force of the contact surface of the conductive film layer 1 between the outer ring 3 and the outer ring 3. When the supply current of the first power source 9 is 4A and the rotational speed of the transmission shaft is 200rpm, at the moment when the first power source 9 is turned on, the friction force drops from an average of 0.07N to 0.05N, and the average value of the friction force can be seen. A significant drop of 28%.

Test Example 2, as shown in Figure 6, Figure 6 shows the control curve of the friction stability in the current-carrying solid film lubricated bearing under the condition of no power supply; the abscissa in the figure is time (min), and the ordinate is Friction (N), the overall test time is 4 hours. It can be seen that during the 4-hour friction process when the power is not turned on and the rotational speed of the transmission shaft is 300 rpm, the frictional force of the current-carrying solid film lubricated bearing gradually increases, and some uneven jumps appear.

Test Example 3, as shown in Figure 7, Figure 7 shows the control curve of the current on the stability of the friction force in the current-carrying solid film lubricated bearing under the condition of electrification. The abscissa in the figure is time (min), and the ordinate is time (min) For friction force (N), the overall test time is 4 hours. It can be seen that during the 4-hour friction process when the power is energized and the supply current of the first power supply 9 is 4A and the rotational speed of the transmission shaft is 300rpm, the frictional force of the current-carrying solid film lubricated bearing of the present invention (Fig. (represented by 100) at a lower stable value; while for the non-lubricated bearing (represented by 200 in the figure) that is lubricated without grease and without the conductive film layer 1 (represented by 200 in the figure), only 20 A sudden jump in friction occurred within minutes, and the non-lubricated bearing failed.

In the second embodiment of the present invention, as shown in FIG. 4 , the current-carrying solid film lubricated bearing includes a journal 5 , a bearing bush 6 and a bearing seat 7 that are sequentially sleeved from the inside to the outside, that is, the current-carrying solid film lubricated bearing for sliding bearings.

In this embodiment, the first implementation

The outer surface of the journal 5 is provided with the conductive film layer 1 , so that the journal 5 and the bearing bush 6 are isolated by the conductive film layer 1 . The electrical conductivity of the contact surface between the journal 5 and the bearing bush 6 is improved by the conductive film layer 1 , so as to avoid the accumulation of electric charges between the journal 5 and the bearing bush 6 , thereby preventing the journal 5 from accumulating. The contact surface with the bearing bush 6 is damaged due to the breakdown phenomenon, which effectively reduces the occurrence rate of the breakdown phenomenon caused by the accumulation of electric charges in the current-carrying solid film lubricated bearing.

Embodiment 2 in this embodiment

The conductive film layer 1 is provided on the inner surface of the bearing bush 6 , so that the journal 5 and the bearing bush 6 are isolated by the conductive film layer 1 . The electrical conductivity of the contact surface between the journal 5 and the bearing bush 6 is improved by the conductive film layer 1 , so as to avoid the accumulation of electric charges between the journal 5 and the bearing bush 6 , thereby preventing the journal 5 from accumulating. The contact surface with the bearing bush 6 is damaged due to the breakdown phenomenon, which effectively reduces the occurrence rate of the breakdown phenomenon caused by the accumulation of electric charges in the current-carrying solid film lubricated bearing.

In this embodiment, the third implementation

As shown in FIG. 4 , the outer surface of the journal 5 and the outer surface of the bearing bush 6 are both provided with the conductive film layer 1 , so that the contact between the journal 5 and the bearing bush 6 is conductive The contact between the film layer 1 and the conductive film layer 1 . The electrical conductivity of the contact surface between the journal 5 and the bearing bush 6 is improved by the conductive film layer 1 , so as to avoid the accumulation of electric charges between the journal 5 and the bearing bush 6 , thereby preventing the journal 5 from accumulating. The outer surface of the bearing shell 6 and the inner surface of the bearing shell 6 are damaged.

For the current-carrying solid film lubricated bearing in this embodiment, as shown in FIG. 4 , the transmission shaft 11 is assembled with the journal 5 , that is, the transmission shaft 11 is inserted into the central hole of the journal 5 . The transmission shaft 11 is installed in cooperation with the inner surface of the journal 5 , so that when the transmission shaft 11 rotates, the journal 5 can be driven to rotate. The current-carrying solid film lubricated bearing further includes a second power source 10; the second power source 10 is electrically connected to the transmission shaft 11 and the bearing seat 7 respectively, and makes the second power source 10, the bearing seat 7. A closed-loop current loop is formed between the bearing bush 6, the journal 5 and the transmission shaft.

Fix the bearing seat 7, turn on the second power supply 10 while rotating the transmission shaft 11, the transmission shaft 11 drives the current-carrying solid film lubricated bearing to run (the bearing bush 6 is stationary, the journal 5 rotation, that is, the bearing bush 6 is a stationary part, and the journal 5 is a rotating part), the current-carrying control of the current-carrying solid film lubricated bearing can be realized. By changing the magnitude of the current of the second power source 10, the frictional force regulation of the current-carrying solid film lubricated bearing under different current intensities can be realized. In the present invention, by forming a current loop, the friction force of the contact surface between the rotating part and the non-moving part during the operation of the current-carrying solid thin film lubricated bearing can be significantly reduced, and its working stability can be improved.

To sum up, the present invention provides a current-carrying solid thin film lubricated bearing and a friction control method thereof. The present invention uses a conductive film layer to replace the grease injected into the grease-lubricated bearing in the prior art, so as to realize the current-carrying film. Lubrication in solid film lubricated bearings; since the conductive film layer is different from grease, it has good electrical conductivity, by arranging the conductive film layer between any two contact surfaces in the current-carrying solid film lubricated bearing, The electric charge accumulation between the contact surfaces in the current-carrying solid film lubricated bearing is avoided, thereby avoiding the damage caused by the breakdown phenomenon of the current-carrying solid film lubricated bearing in a complex electric field environment.

It should be understood that the application of the present invention is not limited to the above examples. For those of ordinary skill in the art, improvements or transformations can be made according to the above descriptions, and all these improvements and transformations should belong to the protection scope of the appended claims of the present invention.

Claims (9)

1. A current-carrying solid thin film lubricated bearing, characterized in that at least one contact surface of the current-carrying solid thin film lubricated bearing is provided with a conductive film layer. 2. The current-carrying solid thin film lubricated bearing according to claim 1, characterized in that it comprises an inner ring and an outer ring sleeved with each other, and a plurality of rollers arranged between the inner ring and the outer ring . 3 . The current-carrying solid thin film lubricated bearing according to claim 2 , wherein the conductive film layer is provided on both the outer surface of the inner ring and the inner surface of the outer ring. 4 . 4 . The current-carrying solid thin film lubricated bearing according to claim 2 , wherein the conductive film layer is provided on the surface of the roller. 5 . 5 . The current-carrying solid thin film lubricated bearing according to claim 2 , wherein the conductive film layer is provided on the surface of the roller, the outer surface of the inner ring and the inner surface of the outer ring. 6 . 6. The current-carrying solid film lubricated bearing according to claim 2, characterized in that it further comprises a first power source, the first end of the first power source is electrically connected to the outer ring; When the inner ring is assembled, the second end of the first power source is electrically connected to the transmission shaft, so that the first power source, the outer ring, the rollers, the inner ring and the transmission shaft constitute a Closed current loop. 7. The current-carrying solid film lubricated bearing according to claim 1, characterized in that it comprises a journal, a bearing bush and a bearing seat which are sequentially sleeved from the inside to the outside; the surface of the journal and/or the surface of the bearing bush The conductive film layer is provided. 8. The current-carrying solid film lubricated bearing according to claim 7, characterized in that it further comprises a second power source, one end of the second power source is electrically connected to the bearing seat; During assembly, the second end of the second power source is electrically connected to the transmission shaft, so that a closed-loop current loop is formed between the second power source, the bearing seat, the bearing bush and the journal. 9. A friction control method based on the current-carrying solid film lubricated bearing of claim 6, characterized in that it comprises the steps of: Sleeve the current-carrying solid film lubricated bearing on the drive shaft; electrically connecting the first end of the first power source with the outer ring, and electrically connecting the second end of the first power source with the transmission shaft; Turn on the power and drive the drive shaft to rotate.

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