CN113720560A - Brake chamber vibration durability test bed - Google Patents
Brake chamber vibration durability test bed Download PDFInfo
- Publication number
- CN113720560A CN113720560A CN202111051144.6A CN202111051144A CN113720560A CN 113720560 A CN113720560 A CN 113720560A CN 202111051144 A CN202111051144 A CN 202111051144A CN 113720560 A CN113720560 A CN 113720560A
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- bearing seat
- vibration table
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- cam
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- 230000005284 excitation Effects 0.000 claims abstract description 44
- 230000000149 penetrating effect Effects 0.000 claims abstract description 5
- 238000001514 detection method Methods 0.000 abstract description 5
- 230000006835 compression Effects 0.000 description 4
- 238000007906 compression Methods 0.000 description 4
- 230000008602 contraction Effects 0.000 description 4
- 230000001788 irregular Effects 0.000 description 4
- 230000001133 acceleration Effects 0.000 description 3
- 238000009434 installation Methods 0.000 description 3
- 238000010998 test method Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M7/00—Vibration-testing of structures; Shock-testing of structures
- G01M7/02—Vibration-testing by means of a shake table
- G01M7/025—Measuring arrangements
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- General Physics & Mathematics (AREA)
- Vibration Prevention Devices (AREA)
Abstract
The invention discloses a brake air chamber vibration durability test bed, which belongs to the technical field of automobile accessory detection equipment and comprises a base, wherein a first bearing seat and a second bearing seat are arranged on the base; a rotating shaft of the motor is connected with the front part of the driving shaft, the rear part of the driving shaft is connected with the first bearing seat and the second bearing seat, the driving shaft is provided with an excitation cam, the excitation cam is positioned between the first bearing seat and the second bearing seat, a convex block is arranged on the surface of the excitation cam, and a gap is formed between the excitation cam and the base and is larger than the height of the convex block; the base is provided with a guide screw, the lower spring, the vibration table and the upper spring are sequentially arranged on the guide screw in a penetrating manner, the tail end of the guide screw is screwed into the adjusting nut, the downward tension of the upper spring enables the vibration table to be pressed on the excitation cam, the upward tension of the lower spring supports the vibration table, and the vibration table is provided with a support; the invention aims to provide a brake chamber vibration durability test bed which is simple in structure, reliable in performance and low in cost.
Description
Technical Field
The invention belongs to the technical field of automobile accessory detection equipment, and relates to a test bed for detecting vibration durability of an automobile brake chamber.
Background
In the air pressure braking system adopted by commercial vehicles, a brake air chamber is a key part and is a device composed of an air inlet, a cover, a diaphragm, a supporting disc, a return spring, a shell, a push rod, a connecting fork, a clamp, a bolt and the like. And the brake chamber has more and more cases of failure caused by vibration in the use process, so the related requirements on the vibration durability of the brake chamber are newly added in the brake chamber performance requirement and the bench test method (replacing QC/T790 and 2007) of the automobile industry standard QC/T790 and 2018 automobile and trailer of the people's republic of China beginning to be implemented from 9.1.2018.
Disclosure of Invention
The invention solves the problem of providing a brake chamber vibration durability test bed which has simple structure, reliable performance and low cost and can complete the brake chamber vibration durability test specified in the automobile industry standard QC/T790-2018 automobile and trailer brake chamber performance requirement and bench test method of the people's republic of China.
In order to solve the problems, the invention adopts the technical scheme that: the vibration table comprises a motor, a driving shaft, a base, a vibration table, a lower spring and an upper spring, wherein a first bearing seat and a second bearing seat are arranged on the base; a rotating shaft of the motor is connected with the front part of the driving shaft, the rear part of the driving shaft is connected with the first bearing seat and the second bearing seat, the driving shaft is provided with an excitation cam, the excitation cam is positioned between the first bearing seat and the second bearing seat, a convex block is arranged on the surface of the excitation cam, a gap is formed between the excitation cam and the base, and the gap is greater than the height of the convex block; the base is provided with a guide screw rod, the lower spring, the vibration table and the upper spring are sequentially arranged on the guide screw rod in a penetrating manner, the tail end of the guide screw rod is screwed with an adjusting nut, the vibration table is pressed on the excitation cam by the downward tension of the upper spring, the vibration table is supported by the upward tension of the lower spring, the driving shaft is driven by the rotating shaft to rotate the excitation cam, the vibration table is pushed when the lug rotates to the upper part, the upward tension of the lower spring is used as an assistant to enable the vibration table to move upwards, the upper spring is compressed and contracted, the tension is increased to press the vibration table downwards, when the lug rotates away from the upper part, the vibration table moves downwards along the pressure of the upper spring, the lower spring is compressed and contracted, the tension is increased to support the vibration table upwards, and the vibration table vibrates upwards and downwards circularly, the vibration table is provided with a support, and the support is used for fixedly mounting various brake chambers.
In the above technical solution, a more specific technical solution may also be: the first bearing seat with the inside of second bearing seat all is equipped with bearing and oil blanket, the end of drive shaft is equipped with stop nut, second bearing seat is equipped with the bearing cap, stop nut with the bearing cap is used for preventing appear forward or backward displacement when the drive shaft rotates.
Further: the base is provided with four guide screws, the four guide screws are all sleeved with the lower spring, the vibrating table is provided with four mounting holes matched with the four guide screws, the four guide screws penetrate through the mounting holes to enable the vibrating table to be pressed on the lower spring, the upper spring is sleeved on the four guide screws, the adjusting nut is screwed in the upper spring to enable the upper spring to be pressed on the vibrating table, and the stability of the vibrating table in vertical vibration is guaranteed.
Further: the tail end of the rotating shaft is provided with a Y-direction U-shaped groove, the front end of the driving shaft is provided with an X-direction U-shaped groove, the Y-direction U-shaped groove is connected with one end of a connecting block through a bolt assembly, and the other end of the connecting block is connected into the X-direction U-shaped groove through a bolt assembly, so that the driving shaft can be replaced conveniently; during the assembly Y to U type groove with X to U type groove both become 90 degrees contained angles, with a cross universal drive joint is constituteed jointly to the connecting block, and universal drive characteristic can reduce the required precision to position size when the test bench installation is adjusted.
Further: the excitation cam is fixed on the driving shaft through the inner hexagon bolt, so that the excitation cam is convenient to replace.
Further: the excitation cam be equipped with two on the surface the lug, two contained angle A between the lug is 120 degrees to 180 degrees, and the vibration acceleration by the appearance design decision of excitation cam can be through setting for motor speed realizes fixed excitation frequency, two contained angle between the lug is established to 180 degrees rotatory week and can be aroused the same regular vertical vibration of twice frequency because the jolt vibration that produces when the car goes also is irregular, two contained angle between the lug is established to 120 degrees rotatory week and can be aroused the different irregular vertical vibration of twice frequency.
Due to the adoption of the technical scheme, compared with the prior art, the invention has the following beneficial effects: when the excitation cam with the convex block on the circumferential surface rotates, the convex block rotates to the upper side to serve as a main force to push the vibration table upwards, the tension of the lower spring serves as an auxiliary force to enable the vibration table to move upwards, the self weight of the vibration table and the tension of the upper spring enable the vibration table to move downwards after the convex block rotates away from the upper side, and the brake air chamber arranged on the vibration table support vibrates up and down through repeated up-and-down movement; the test stand for the vibration durability of the brake chamber has the advantages of simple structure, low cost and reliable performance, and can be used for carrying out the vibration durability test of the brake chamber according to the requirements of QC/T790 and 2018 automobile and trailer brake chamber performance and the bench test method of the automobile industry standard of the people's republic of China.
Drawings
Fig. 1 is a schematic structural view of the present invention.
FIG. 2 is a schematic illustration of the present invention in a disassembled state.
Fig. 3 is a view from direction K of fig. 1.
Fig. 4 is a cross-sectional view of the drive shaft of the present invention.
Fig. 5 is a schematic view showing the connection of the rotary shaft and the drive shaft according to the present invention.
Fig. 6 is a left side view of fig. 4.
Fig. 7 is a schematic structural diagram of an excitation cam according to an embodiment of the present invention.
Fig. 8 is a schematic structural diagram of a second excitation cam according to an embodiment of the present invention.
In the figure: 1. a motor; 11. a rotating shaft; 12. a U-shaped groove in the Y direction; 2. a drive shaft; 21. a first bearing housing; 22. a second bearing housing; 23. exciting a cam; 231. a bump; 24. a bearing cap; 25. a bearing; 26. oil sealing; 27. a hexagon socket head cap screw; 28. a limit nut; 29. an X-direction U-shaped groove; 3. a base; 31. a lead screw; 32. adjusting the nut; 4. a vibration table; 41. a support; 42. mounting holes; 5. a lower spring; 6. an upper spring; 7. connecting blocks; 8. a brake chamber.
Detailed Description
The invention will be further described in detail with reference to the following examples of the drawings:
the first embodiment is as follows:
the test bed for the vibration durability of the brake air chamber shown in fig. 1 comprises a motor 1, a driving shaft 2, a base 3, a vibration table 4, a lower spring 5 and an upper spring 6, wherein a first bearing seat 21 and a second bearing seat 22 are arranged on the base 3; the rotating shaft 11 of the motor 1 is connected with the front part of the driving shaft 2, the rear part of the driving shaft 2 is connected with the first bearing seat 21 and the second bearing seat 22, the driving shaft 2 is provided with an excitation cam 23, the excitation cam 23 is positioned between the first bearing seat 21 and the second bearing seat 22, the surface of the excitation cam 23 is provided with a convex block 231, and the excitation cam 23 and the base 3 have a space which is larger than the height of the convex block 231; the base 3 is provided with a guide screw 31, the lower spring 5, the vibration table 4 and the upper spring 6 are sequentially arranged on the guide screw 31 in a penetrating way, the tail end of the guide screw 31 is screwed with an adjusting nut 32, the downward tension of the upper spring 6 enables the vibration table 4 to be pressed on the excitation cam 23, the upward tension of the lower spring 5 supports the vibration table 4, the rotating shaft 11 drives the driving shaft 2 to enable the excitation cam 23 to rotate, when the lug 231 rotates upwards, the vibration table 4 is pushed, the upward tension of the lower spring 5 serves as an auxiliary to enable the vibration table 4 to move upwards, the compression and contraction tension of the upper spring 6 at the moment is increased to downwards press the vibration table 4, when the lug 231 rotates upwards, the vibration table 4 moves downwards along with the pressure of the upper spring 6, the compression and contraction tension of the lower spring 5 is increased to upwards support the vibration table 4 at the moment, the vibration table 4 vibrates upwards and downwards in a circulating mode, the vibration table 4 is provided with a support 41, and the support 41 is used for fixedly installing various brake air chambers 8, mainly comprises a disc type brake air chamber, a drum type spring brake air chamber or a drum type disc spring brake air chamber. The first bearing housing 21 and the second bearing housing 22 are provided with a bearing 25 and an oil seal 26 inside, the end of the driving shaft 2 is provided with a limit nut 28, the second bearing housing 22 is provided with a bearing 25 cover 24, and the limit nut 28 and the bearing 25 cover 24 are used for preventing the driving shaft 2 from moving forwards or backwards when rotating. Four guide screw rods 31 are arranged on the base 3, the four guide screw rods 31 are all sleeved with lower springs 5, four mounting holes 42 matched with the four guide screw rods 31 are formed in the vibrating table 4, the four guide screw rods 31 penetrate through the mounting holes 42 to enable the vibrating table 4 to be pressed on the lower springs 5, the upper springs 6 are sleeved on the four guide screw rods 31, the adjusting nuts 32 are screwed in the upper springs 6 to enable the upper springs 6 to be pressed on the vibrating table 4, and the stability of the vibrating table 4 during vertical vibration is guaranteed. Y has been seted up to the end of pivot 11 to U type groove 12, X has been seted up to U type groove 29 to the front end of drive shaft 2, Y is connected with the one end of connecting block 7 through bolt assembly in to U type groove 12, the other end of connecting block 7 passes through bolt assembly and connects at X to U type inslot 29, be convenient for change drive shaft 2, Y becomes 90 degrees contained angles to U type groove 12 and X to U type groove 29 during the assembly, constitute a cross universal drive joint jointly with connecting block 7, universal drive characteristic can reduce the required precision to position size when test bench installation adjustment. The exciting cam 23 is fixed on the driving shaft 2 by a hexagon socket head cap screw 27, which is convenient for replacing the exciting cam 23.
As shown in fig. 7, two protrusions 231 are provided on the surface of the excitation cam 23, the included angle a between the two protrusions 231 is 180 degrees, the vibration acceleration is determined by the design of the external shape of the excitation cam 23, the fixed excitation frequency can be realized by setting the rotation speed of the motor 1, and the included angle between the two protrusions 231 is set to 180 degrees and can excite regular vertical vibration with the same frequency twice for simulating the detection of the vibration durability of the brake chamber 8 during parking.
Example two:
the test bed for the vibration durability of the brake air chamber shown in fig. 1 comprises a motor 1, a driving shaft 2, a base 3, a vibration table 4, a lower spring 5 and an upper spring 6, wherein a first bearing seat 21 and a second bearing seat 22 are arranged on the base 3; the rotating shaft 11 of the motor 1 is connected with the front part of the driving shaft 2, the rear part of the driving shaft 2 is connected with the first bearing seat 21 and the second bearing seat 22, the driving shaft 2 is provided with an excitation cam 23, the excitation cam 23 is positioned between the first bearing seat 21 and the second bearing seat 22, the surface of the excitation cam 23 is provided with a convex block 231, and the excitation cam 23 and the base 3 have a space which is larger than the height of the convex block 231; the base 3 is provided with a guide screw 31, the lower spring 5, the vibration table 4 and the upper spring 6 are sequentially arranged on the guide screw 31 in a penetrating way, the tail end of the guide screw 31 is screwed with an adjusting nut 32, the downward tension of the upper spring 6 enables the vibration table 4 to be pressed on the excitation cam 23, the upward tension of the lower spring 5 supports the vibration table 4, the rotating shaft 11 drives the driving shaft 2 to enable the excitation cam 23 to rotate, when the lug 231 rotates upwards, the vibration table 4 is pushed, the upward tension of the lower spring 5 serves as an auxiliary to enable the vibration table 4 to move upwards, the compression and contraction tension of the upper spring 6 at the moment is increased to downwards press the vibration table 4, when the lug 231 rotates upwards, the vibration table 4 moves downwards along with the pressure of the upper spring 6, the compression and contraction tension of the lower spring 5 is increased to upwards support the vibration table 4 at the moment, the vibration table 4 vibrates upwards and downwards in a circulating mode, the vibration table 4 is provided with a support 41, and the support 41 is used for fixedly installing various brake air chambers 8, mainly comprises a disc type brake air chamber, a drum type spring brake air chamber or a drum type disc spring brake air chamber. The first bearing housing 21 and the second bearing housing 22 are provided with a bearing 25 and an oil seal 26 inside, the end of the driving shaft 2 is provided with a limit nut 28, the second bearing housing 22 is provided with a bearing 25 cover 24, and the limit nut 28 and the bearing 25 cover 24 are used for preventing the driving shaft 2 from moving forwards or backwards when rotating. Four guide screw rods 31 are arranged on the base 3, the four guide screw rods 31 are all sleeved with lower springs 5, four mounting holes 42 matched with the four guide screw rods 31 are formed in the vibrating table 4, the four guide screw rods 31 penetrate through the mounting holes 42 to enable the vibrating table 4 to be pressed on the lower springs 5, the upper springs 6 are sleeved on the four guide screw rods 31, the adjusting nuts 32 are screwed in the upper springs 6 to enable the upper springs 6 to be pressed on the vibrating table 4, and the stability of the vibrating table 4 during vertical vibration is guaranteed. Y has been seted up to the end of pivot 11 to U type groove 12, X has been seted up to U type groove 29 to the front end of drive shaft 2, Y is connected with the one end of connecting block 7 through bolt assembly in to U type groove 12, the other end of connecting block 7 passes through bolt assembly and connects at X to U type inslot 29, be convenient for change drive shaft 2, Y becomes 90 degrees contained angles to U type groove 12 and X to U type groove 29 during the assembly, constitute a cross universal drive joint jointly with connecting block 7, universal drive characteristic can reduce the required precision to position size when test bench installation adjustment. The exciting cam 23 is fixed on the driving shaft 2 by a hexagon socket head cap screw 27, which is convenient for replacing the exciting cam 23.
As shown in fig. 8, two convex blocks 231 are arranged on the surface of the excitation cam 23, an included angle a between the two convex blocks 231 is 120 degrees, the vibration acceleration is determined by the shape design of the excitation cam 23, the fixed excitation frequency can be realized by setting the rotating speed of the motor 1, since the bumping vibration generated during the driving of the automobile is irregular, the included angle between the two convex blocks 231 is set to 120 degrees and rotates for one circle, the irregular vertical vibration with different frequencies can be excited twice, and the detection is used for simulating the vibration durability detection of the brake chamber 8 during the driving.
Claims (6)
1. The utility model provides a brake air chamber vibration durability test bench which characterized in that: the vibration table comprises a motor, a driving shaft, a base, a vibration table, a lower spring and an upper spring, wherein a first bearing seat and a second bearing seat are arranged on the base; a rotating shaft of the motor is connected with the front part of the driving shaft, the rear part of the driving shaft is connected with the first bearing seat and the second bearing seat, the driving shaft is provided with an excitation cam, the excitation cam is positioned between the first bearing seat and the second bearing seat, a convex block is arranged on the surface of the excitation cam, a gap is formed between the excitation cam and the base, and the gap is greater than the height of the convex block; the base is provided with a guide screw rod, the lower spring, the vibration table and the upper spring are sequentially arranged on the guide screw rod in a penetrating mode, the tail end of the guide screw rod is screwed into an adjusting nut, the downward tension of the upper spring enables the vibration table to be pressed on the excitation cam, the upward tension of the lower spring supports the vibration table, and the vibration table is provided with a support.
2. The brake chamber vibration durability test stand of claim 1, characterized by: the bearing and the oil seal are arranged in the first bearing seat and the second bearing seat, a limit nut is arranged at the tail end of the driving shaft, and the second bearing seat is provided with a bearing cover.
3. The brake chamber vibration durability test stand according to claim 1 or 2, characterized in that: the base is provided with four guide screws, the four guide screws are all sleeved with the lower spring, the vibration table is provided with four mounting holes matched with the four guide screws, the four guide screws penetrate through the mounting holes to enable the vibration table to be pressed on the lower spring, and the four guide screws are all sleeved with the upper spring and screwed into the adjusting nuts to enable the upper spring to be pressed on the vibration table.
4. The brake chamber vibration durability test stand of claim 3, characterized in that: y is seted up to the end of pivot to U type groove, X is seted up to U type groove to the front end of drive shaft, Y is connected with the one end of connecting block through bolt assembly to U type inslot, the other end of connecting block passes through bolt assembly to be connected X is to U type inslot.
5. The brake chamber vibration durability test stand of claim 4, characterized in that: the excitation cam is fixed on the driving shaft through an inner hexagon bolt.
6. The brake chamber vibration durability test stand of claim 5, characterized by: the surface of the excitation cam is provided with two convex blocks, and an included angle A between the two convex blocks is 120-180 degrees.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111051144.6A CN113720560A (en) | 2021-09-08 | 2021-09-08 | Brake chamber vibration durability test bed |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111051144.6A CN113720560A (en) | 2021-09-08 | 2021-09-08 | Brake chamber vibration durability test bed |
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| Publication Number | Publication Date |
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| CN113720560A true CN113720560A (en) | 2021-11-30 |
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ID=78682769
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
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| CN202111051144.6A Pending CN113720560A (en) | 2021-09-08 | 2021-09-08 | Brake chamber vibration durability test bed |
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| CN (1) | CN113720560A (en) |
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