Material friction noise test bench plug-in quick release structure

Abstract

The present invention relates to the technical field of friction abnormal noise test equipment, and specifically discloses a plug-type quick-release structure of a material friction abnormal noise test bench, including a driving member, a pressure rod and a pressure head, the pressure head is fixed at the bottom of the pressure rod, a mounting seat is fixed at the bottom of the output shaft of the driving member, a through groove is provided in the mounting seat, the cross section of the through groove is T-shaped, a T-shaped connector is provided at the top of the pressure rod, the through groove includes a horizontal section and a vertical section, a support plate is horizontally provided in the horizontal section, an elastic layer is bonded between the support plate and the top wall of the horizontal section, a closed cavity is formed between the three, hydraulic oil is filled in the cavity, a plurality of first elastic members located in the cavity are also fixed between the support plate and the top wall of the horizontal section; a sliding cavity is also provided in the mounting seat, a plunger is slidably connected in the sliding cavity, a second elastic member is fixed between the plunger and the mounting seat, and an oil channel is provided in the mounting seat. The vertical loading mechanism in this patent is used to realize the rapid disassembly and assembly between the pressure rod and the mounting seat.

Description

Technical Field

[0001] The invention relates to the technical field of friction abnormal noise testing equipment, in particular to a plug-type quick-release structure of a material friction abnormal noise testing bench. Background Art

[0002] In the automobile structure, the friction between two components constitutes a friction pair. The process in which the friction state between the friction pairs changes from static friction to dynamic friction is called stick-slip motion. During the stick-slip motion, the number of relative vibrations between the friction pairs per unit time is called the pulse rate.

[0003] As a typical friction phenomenon, stick-slip motion is widely present in mechanical systems and will cause many negative problems to the automobile mechanical system, such as chatter, oscillation, and sharp noise. Therefore, in order to improve the stability of the automobile mechanical system and reduce vibration, abnormal noise testing is required. The conventional testing method is that the two friction materials to be tested form a friction pair, in which the rigid friction material moves horizontally and the flexible friction material is connected to the pressure head that provides vertical force.

[0004] The existing vertical loading mechanism usually includes a linear motor, a pressure rod and a pressure head fixed at the lower end of the pressure rod. The pressure rod is fixedly connected to the output shaft of the linear motor through a mounting seat. When different materials are subjected to friction tests, different materials need to be replaced. When replacing the friction material A on the lower surface of the pressure head, the pressure rod needs to be removed from the mounting seat first and then replaced. After the replacement is completed, the pressure rod is reinstalled on the mounting seat. In the existing vertical force-applying mechanism, the pressure rod and the mounting seat are connected together by fasteners such as bolts. When disassembling and installing the pressure rod, the bolts need to be continuously tightened, which is troublesome to operate. Frequent disassembly and assembly can easily cause thread stripping, resulting in failure of the connection between the pressure rod and the mounting seat. Summary of the invention

[0005] The present invention provides a plug-type quick-release structure for a material friction noise test bench to solve the problem in the prior art that frequent disassembly and assembly between a pressure rod and a mounting seat through bolts easily causes thread slippage, resulting in failure of the connection between the pressure rod and the mounting seat.

[0006] In order to achieve the above object, the technical solution of the present invention is:

[0007] The plug-type quick-release structure of the material friction noise test bench includes a driving member, a pressure rod and a pressure head. The pressure head is fixed at the bottom of the pressure rod and is used to fix the friction material A. A mounting seat is fixed at the bottom of the output shaft of the driving member. A through groove is horizontally opened in the mounting seat. The cross section of the through groove is T-shaped. A T-shaped connector is integrally formed at the top of the pressure rod, and the connector can slide horizontally into the through groove.

[0008] The through groove includes a horizontal section and a vertical section. A support plate is horizontally arranged in the horizontal section. An elastic layer is bonded between the support plate and the top wall of the horizontal section. A closed cavity is formed between the elastic layer, the top wall of the horizontal section and the support plate. The cavity is filled with hydraulic oil. A plurality of first elastic members located in the cavity are also fixed between the support plate and the top wall of the horizontal section. A sliding cavity symmetrically arranged relative to the vertical section is also provided in the mounting seat. A plunger is horizontally slidingly sealed and connected in the sliding cavity. A second elastic member is fixed between the end of the plunger away from the vertical section and the mounting seat. Oil passages respectively connecting the cavity and the sliding cavity are provided in the mounting seat.

[0009] The technical principle and effect of this technical solution are:

[0010] In this scheme, after the two friction materials are fixed separately, the connecting head on the top of the pressure rod is inserted into the through groove for preliminary positioning. At this time, the connecting head and the through groove are still in a loose state. The driving part is started to move the pressure head downward, and the friction material A and the friction material B come into contact and continue to move downward. At this time, there is no relative movement between the two materials, and the connecting head moves upward, the extrusion support plate moves upward, the cavity volume decreases, and the hydraulic oil in the cavity is driven to flow into the sliding cavity, so that the plunger slides into the horizontal section. The plungers on both sides press the pressure rod tightly and then close the driving part to carry out the friction test.

[0011] After the test is completed, the driving part causes the pressure head to move upward. When the two materials no longer resist each other, the support plate moves downward under the action of the first elastic part's reset, and the cavity volume becomes larger, causing the hydraulic oil in the sliding cavity to return to the cavity. The second elastic part resets the plunger to move into the sliding cavity, loosening the pressure rod, so that the pressure rod can be easily removed. Therefore, the vertical loading mechanism in this solution is adopted to realize the rapid disassembly and assembly of the pressure rod, and the traditional bolt connection method is abandoned, making the disassembly and assembly of the pressure rod more convenient.

[0012] Furthermore, support plates are integrally formed on both sides of the mounting seat, and a coupling is provided at the end of the output shaft of the driving member. The support plate and the coupling are detachably connected by bolts.

[0013] Beneficial effect: This arrangement makes it easy to disassemble the entire mounting base.

[0014] Furthermore, a vertically arranged connecting block is integrally formed on the top of the pressure head, and the connecting block is detachably connected to the pressure rod by bolts.

[0015] Beneficial effect: This makes it easy to replace different pressure heads according to different friction tests.

[0016] Furthermore, it also includes a support frame, and a steel column for fixing the friction material B is provided below the pressure head, and both ends of the steel column are fixedly connected to the support frame through an elastic support component.

[0017] Beneficial effect: With this arrangement, the external excitation source can realize the horizontal movement of the friction material B by exciting the steel column, and a friction pair is formed between the two materials.

[0018] Furthermore, a plurality of weight-reducing holes are opened on the steel column, and a horizontal plate located below the pressure head is detachably connected to the steel column.

[0019] Beneficial effect: The weight-reducing holes are opened on the steel column to reduce the weight of the steel column, and the horizontal plate is set to fix the friction material B.

[0020] Furthermore, the pressure rod is a spring sheet, and the thickness of the spring sheet is 5 to 10 mm.

[0021] Beneficial effect: The pressure rod is set as a spring sheet, so that during the friction test, the spring sheet will vibrate under the side effect of friction, and the result of the friction test can be obtained by detecting the amplitude of the spring sheet through a sensor.

[0022] Furthermore, the bottom of the cross section of the pressure head is an arc-shaped segment convex downward.

[0023] Beneficial effect: Since the bottom surface of the traditional pressure head is usually a plane, it is difficult to ensure that the two materials are completely parallel due to factors such as processing accuracy and assembly accuracy, so that the two materials appear in point contact or line contact during the friction test due to the existence of vibration, which makes the results of the abnormal sound test have a large deviation. Therefore, in this solution, the bottom of the cross section of the pressure head is set to a downwardly protruding arc segment, so that the friction force between friction material A and friction material B is perpendicular to the tangent direction of the arc segment, and the two materials can always maintain surface contact.

[0024] Furthermore, the pressure head and the friction material A are detachably connected.

[0025] Beneficial effect: Due to the traditional bonding method, it is not only difficult to remove, but also the bottom surface of the pressure head will be uneven, which is not convenient for the next test.

[0026] Furthermore, a plurality of grooves are provided at the bottom of the pressure head, and the grooves are evenly distributed along the circumference of the arc segment. The top surface of the friction material A is provided with a plurality of connecting protrusions corresponding to the grooves, and the connecting protrusions and the grooves are meshed with each other.

[0027] Beneficial effect: This arrangement prevents relative displacement between the friction material A and the bottom surface of the pressure head.

[0028] Furthermore, the plurality of drawing grooves are arranged toward the center of the arc segment.

[0029] Beneficial effect: This arrangement can further improve the effect of limiting relative displacement. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a structural schematic diagram of Example 1 of the plug-type quick-release structure of the material friction noise test bench of the present invention;

[0031] Figure 2 for Figure 1 A magnified schematic diagram of part A;

[0032] Figure 3 This is a schematic diagram of the structure of the connector in Example 1 of the present invention when it is working;

[0033] Figure 4 This is a schematic diagram of the structure of Embodiment 2 of the present invention;

[0034] Figure 5 It is a cross-sectional view of the pressure head in Example 2 of the present invention. DETAILED DESCRIPTION

[0035] The following is further described in detail through specific implementation methods:

[0036] The figure marks in the drawings of the specification include: friction material A1, friction material B2, driving member 10, pressure rod 11, pressure head 12, coupling 13, mounting seat 14, support plate 15, through groove 16, connecting head 17, support plate 18, elastic layer 19, first elastic member 20, sliding cavity 21, plunger 22, second elastic member 23, connecting block 24, steel column 25, horizontal plate 26, clamping strip 27, arc segment 28, connecting protrusion 29.

[0037] Embodiment 1:

[0038] Basically as attached Figure 1 and Figure 2 As shown: the plug-type quick-release structure of the material friction and abnormal noise test bench includes a support frame, a driving member 10, a pressure rod 11 and a pressure head 12, wherein the driving member 10 is a linear motor, the linear motor is fixed on the support frame, a coupling 13 is provided at the end of the output shaft of the linear motor, a mounting seat 14 is provided at the bottom of the coupling 13, support plates 15 are integrally formed on both sides of the mounting seat 14, the support plates 15 and the coupling 13 are usually detachably connected by bolts, a through groove 16 is horizontally opened in the mounting seat 14, and the cross-section of the through groove 16 is T-shaped. In this embodiment, a T-shaped connecting head 17 is integrally formed on the top of the pressure rod 11, so that the connecting head 17 slides horizontally into the through groove 16 to achieve the connection between the pressure rod 11 and the mounting seat 14, which is convenient and quick.

[0039] The through groove 16 includes a horizontal section and a vertical section. A support plate 18 is horizontally arranged in the horizontal section. An elastic layer 19 is bonded between the support plate 18 and the top wall of the horizontal section. A closed cavity is formed between the elastic layer 19, the top wall of the horizontal section and the support plate 18. The cavity is filled with hydraulic oil. A plurality of first elastic members 20 located in the cavity are also fixed between the support plate 18 and the top wall of the horizontal section. In this embodiment, the elastic member is a compression spring. When the first elastic member 20 is not subjected to upward pressure, the distance between the support plate 18 and the vertical section is greater than the thickness of the horizontal section of the connector 17.

[0040] A sliding cavity 21 symmetrically arranged relative to the vertical section is also provided in the mounting seat 14. A plunger 22 is horizontally slidably sealed in the sliding cavity 21. A second elastic member 23 is fixed between the end of the plunger 22 away from the vertical section and the mounting seat 14. In this embodiment, the second elastic member 23 is a tension spring. Oil passages connecting the cavity body and the sliding cavity 21 are provided in the mounting seat 14. When the second elastic member 23 is in an unstressed state, the free end of the plunger 22 is located in the sliding cavity 21.

[0041] A vertically arranged connecting block 24 is integrally formed on the top of the pressure head 12, and a mounting hole is opened on the connecting block 24. A threaded hole is provided at the lower part of the pressure rod 11. Bolts are inserted into the threaded hole and the mounting hole to achieve a fixed connection between the pressure rod 11 and the pressure head 12. In order to reduce stress concentration, a connecting strip is provided between the bolt and the pressure rod 11. The bottom of the pressure head 12 is used for bonding the friction material A1.

[0042] A steel column 25 for fixing the friction material B2 is also provided below the pressure head 12. The steel column 25 is a hollow structure and has a rectangular cross-section. A number of weight-reducing holes are evenly distributed on the steel column 25. Both ends of the steel column 25 are fixedly connected to the support frame through elastic support components. A horizontal plate 26 is detachably connected to the steel column 25. The horizontal plate 26 is used to fix the friction material B2. The friction material B2 is a rigid material, such as a steel plate. The specific fixing method is: a number of mounting holes are opened on the horizontal plate 26, and clamping strips 27 are provided on both sides of the horizontal plate 26. A number of connecting holes are opened on the clamping strip 27. Bolts are threadedly connected between the connecting holes and the mounting holes, so that the friction material B2 is fixed to the horizontal plate 26.

[0043] In the specific implementation, after the two friction materials B2 are fixed respectively, the connector 17 at the top of the pressure rod 11 is inserted into the through slot 16 for preliminary positioning. At this time, the connector 17 and the through slot 16 are still in a loose state. The linear motor is started to move the pressure head 12 downward, and the friction material A1 contacts the friction material B2 and continues to move downward. At this time, there is no relative movement between the two materials. Figure 3As shown, the connecting head 17 continues to move upward, the extrusion support plate 18 moves upward, the cavity volume decreases, and the hydraulic oil in the cavity is driven to flow into the sliding cavity 21, so that the plunger 22 slides into the horizontal section. The plungers 22 on both sides press the pressure rod 11 tightly and then turn off the linear motor to perform a friction test.

[0044] After the test is completed, start the linear motor to drive the pressure head 12 to move upward. When the two materials no longer resist each other, the support plate 18 moves downward under the action of the first elastic member 20 resetting, and the cavity volume becomes larger, so that the hydraulic oil in the sliding cavity 21 returns to the cavity. The second elastic member 23 resets the plunger 22 to move into the sliding cavity 21, loosening the pressure rod 11, so that the pressure rod 11 can be easily removed.

[0045] Embodiment 2:

[0046] Basically as attached Figure 4 and Figure 5 As shown: the difference from Example 1 is that in this embodiment, the pressure rod 11 is a spring sheet, and the thickness of the spring sheet is 5 to 10 mm. The spring sheet can be made of stainless steel. The bottom of the cross section of the pressure head 12 is a downwardly protruding arc section 28. After the test is completed, since the friction material A1 is usually fixed to the bottom surface of the pressure head 12 by bonding, it is difficult to clean the friction material A1 from the bottom surface of the pressure head 12, making the bottom surface of the pressure head 12 uneven. Therefore, in this embodiment, the friction material A1 is set to be detachably connected to the bottom surface of the pressure head 12. The specific method is: a plurality of threaded holes are opened on both sides along the length direction of the pressure head 12, and a plurality of through holes corresponding to the threaded holes are opened on the friction material A1. The threaded holes and the inner threads of the through holes are connected with bolts. In order to avoid stress concentration on the through holes and the threaded holes, a connecting strip is also provided between the bolts and the friction material A1.

[0047] In addition, in order to prevent relative displacement between the friction material A1 and the bottom surface of the pressure head 12 during the test, a plurality of grooves are opened at the bottom of the pressure head 12, and the plurality of grooves are evenly distributed along the circumference of the arc segment 28, and each groove faces the center of the arc segment 28. In addition, a plurality of connecting protrusions 29 corresponding to the grooves are provided on the top surface of the friction material A1, and the connecting protrusions 29 and the grooves are engaged with each other.

[0048] During the test, the pressure head 12 and the spring sheet will vibrate together with the friction pair, that is, when the movement of the pressure head 12 is slowed down, it can be seen that the arc segment 28 of the pressure head 12 moves circumferentially relative to its center of the circle, that is, the friction force between the friction material A1 and the friction material B2 is perpendicular to the tangent direction of the arc segment 28. Therefore, during the abnormal noise test, the friction material A1 and the friction material B2 can always maintain surface contact, making the abnormal noise test result more accurate.

[0049] The above is only an embodiment of the present invention, and the common knowledge such as the known specific structure and characteristics in the scheme is not described in detail here. It should be pointed out that for those skilled in the art, several deformations and improvements can be made without departing from the structure of the present invention, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. The plug-type quick-release structure of the material friction noise test bench includes a driving part, a pressure rod and a pressure head. The pressure head is fixed at the bottom of the pressure rod. The pressure head is used to fix the friction material A. The characteristics are: A mounting seat is fixed at the bottom of the output shaft of the driving member, a through slot is horizontally opened in the mounting seat, the cross section of the through slot is T-shaped, and a T-shaped connector is integrally formed at the top of the pressure rod, and the connector can slide horizontally into the through slot; The through groove includes a horizontal section and a vertical section. A support plate is horizontally arranged in the horizontal section. An elastic layer is bonded between the support plate and the top wall of the horizontal section. A closed cavity is formed between the elastic layer, the top wall of the horizontal section and the support plate. The cavity is filled with hydraulic oil. A plurality of first elastic members located in the cavity are also fixed between the support plate and the top wall of the horizontal section. When the first elastic member is not subjected to upward pressure, the distance between the support plate and the vertical section is greater than the thickness of the horizontal section of the connector. A sliding cavity symmetrically arranged relative to the vertical section is also provided in the mounting seat, a plunger is horizontally slidably sealed and connected in the sliding cavity, a second elastic member is fixed between the end of the plunger away from the vertical section and the mounting seat, an oil passage connecting the cavity and the sliding cavity is provided in the mounting seat, and the plunger can press the pressure rod tightly; when the second elastic member is in an unstressed state, the free end of the plunger is located in the sliding cavity; The bottom of the cross section of the pressure head is a downwardly convex arc segment, so that the friction force between the friction material A and the friction material B is perpendicular to the tangent direction of the arc segment; The pressure rod is a spring sheet; Support plates are integrally formed on both sides of the mounting seat, and a coupling is provided at the end of the output shaft of the driving member, and the support plate and the coupling are detachably connected by bolts; A vertically arranged connecting block is integrally formed on the top of the pressure head, and the connecting block is detachably connected to the pressure rod by bolts; The pressure head and the friction material A are detachably connected.

2. The plug-type quick-release structure of the material friction noise test bench according to claim 1 is characterized by: It also includes a support frame, and a steel column for fixing the friction material B is provided below the pressure head, and both ends of the steel column are fixedly connected to the support frame through an elastic support component.

3. The plug-type quick-release structure of the material friction noise test bench according to claim 2 is characterized by: A number of weight-reducing holes are provided on the steel column, and a horizontal plate located below the pressure head is detachably connected to the steel column.

4. The plug-type quick-release structure of the material friction noise test bench according to claim 1 is characterized by: The thickness of the spring sheet is 5 to 10 mm.

5. The plug-type quick-release structure of the material friction noise test bench according to claim 1 is characterized by: A plurality of grooves are provided at the bottom of the pressure head, and the grooves are evenly distributed along the circumference of the arc segment. A plurality of connecting protrusions corresponding to the grooves are provided on the top surface of the friction material A, and the connecting protrusions and the grooves are meshed with each other.

6. The plug-type quick-release structure of the material friction noise test bench according to claim 5 is characterized by: The plurality of drawing grooves are all arranged toward the center of the arc segment.

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