Noise reduction transmission shaft

Abstract

The invention belongs to the technical field of automobile noise reduction, and discloses a noise reduction transmission shaft. Universal joints are installed on the two sides of the telescopic sleeve, the telescopic sleeve is arranged in a through groove in a hollow cylinder in a penetrating mode, a hollow sleeve is arranged on the periphery of the through groove, the interior of the hollow sleeve is divided into an oil storage tank and an empty groove, the oil storage tank is installed on the upper side of the empty groove and communicated with the empty groove through an oil valve, and lubricating oil is stored in the oil storage tank. An air bag is installed at the end, away from the oil valve, in the empty groove, a piston is installed at the front end of the air bag, a hollow bin is arranged in the hollow cylinder, an air pump is installed in the hollow bin, the air pump is communicated with the air bag, and the hollow cylinder is flexibly connected with a vehicle body. The problem that in the prior art, a transmission shaft can generate huge noise in the vehicle running process is solved.

Description

Technical Field

[0001] The invention relates to the technical field of automobile noise reduction, and in particular to a noise reduction transmission shaft. Background Art

[0002] The transmission shaft is the shaft that can transmit power in the transmission shaft of the universal transmission. It is a high-speed, less-supported rotating body. For front-engine rear-wheel drive vehicles, it is the shaft that transmits the rotation of the transmission to the main reducer, and the joints are connected by universal joints.

[0003] When the automobile drive shaft is working, the spline teeth on the outer wall of the spline shaft cooperate with the spline grooves on the inner wall of the telescopic sleeve, and the two generate mechanical vibration when they cooperate. The above vibration and the vibration emitted by the parts connected to the drive shaft will be transmitted to the cavity inside the drive shaft through the welding fork and the spline shaft on the drive shaft. The above two vibrations are gathered in the cavity of the drive shaft tube, which will cause the drive shaft to vibrate more, and eventually form resonance and emit louder noise, affecting driving safety performance and comfort. Summary of the invention

[0004] The purpose of the present invention is to provide a noise-reducing transmission shaft to solve the problem that the transmission shaft in the prior art generates huge noise during vehicle driving.

[0005] To achieve this object, the present invention adopts the following technical scheme: the present invention provides a noise reduction transmission shaft, including a telescopic sleeve, universal joints are installed on both sides of the telescopic sleeve, the telescopic sleeve is inserted into a through groove in a hollow cylinder, a hollow sleeve is arranged on the outer periphery of the through groove, the hollow sleeve is divided into an oil storage tank and an empty groove, the oil storage tank is installed on the upper side of the empty groove, the oil storage tank is connected with the empty groove through an oil valve, lubricating oil is stored in the oil storage tank, an oil drain hole is provided on the inner wall of the hollow sleeve close to the oil valve, the oil drain hole connects the empty groove with the through groove, an airbag is installed at one end of the empty groove away from the oil valve, a piston is installed at the front end of the airbag, a hollow chamber is provided in the hollow cylinder, an air pump is installed in the hollow chamber, the air pump is connected with the airbag, and the hollow cylinder is flexibly connected to the vehicle body.

[0006] Preferably, the oil drain holes are provided in four groups, and the oil drain holes are distributed sequentially along the height direction.

[0007] Preferably, an oil level sensor is installed at the bottom of the oil storage tank, a controller is installed in the hollow bin, the controller is electrically connected to the oil level sensor, an alarm is installed in the hollow bin, and the alarm is electrically connected to the controller.

[0008] Preferably, the controller is also electrically connected to the air pump, and the controller controls the start and stop of the air pump.

[0009] Preferably, the hollow cylinder is provided with a sound exhaust hole, and the sound exhaust hole is communicated with the hollow chamber.

[0010] Preferably, sealing sleeves are installed at both ends of the telescopic sleeve, and the sealing sleeves are clamped at both ends of the hollow sleeve.

[0011] Preferably, an oil filling pipe is provided on the hollow cylinder, a sealing plug is installed on the oil filling pipe, and the oil filling pipe is connected to the oil storage tank.

[0012] Preferably, springs are installed on both sides of the hollow cylinder, and the other ends of the springs are connected to the bottom of the frame.

[0013] Preferably, the outer side of the hollow sleeve is wrapped with sound-absorbing cotton.

[0014] Preferably, a shock-absorbing layer is installed between the sound-absorbing cotton and the hollow sleeve, and the material of the shock-absorbing layer is rubber.

[0015] Beneficial effects: By adding a hollow cylinder at the bottom of the vehicle body, the hollow cylinder is sleeved on the telescopic sleeve, and the telescopic sleeve rotates in the hollow cylinder. Due to the flexible connection between the hollow cylinder and the vehicle body, the hollow cylinder increases the overall weight of the drive shaft, thereby suppressing the vibration of the drive shaft. The vibration of the telescopic sleeve can also be absorbed through the flexible connection of the hollow cylinder. When the oil valve is opened, the oil in the oil storage tank will flow from the oil storage tank into the empty slot. Then the air pump inflates the airbag to push the piston to move toward one side of the oil valve. At the same time, the lubricating oil in the empty slot is squeezed out along the oil drain hole to between the telescopic sleeve and the empty slot, thereby reducing the friction vibration generated by the rotation between the telescopic sleeve and the hollow cylinder, and finally reducing the noise transmitted by the drive shaft. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic diagram of the main body of the noise reduction transmission shaft of the present invention;

[0017] Figure 2 is a cross-sectional view of the noise reduction transmission shaft of the present invention;

[0018] Figure 3 is a cross-sectional view of a hollow cylinder of the present invention;

[0019] Figure 4 It is a cross-sectional view of the hollow bin of the present invention.

[0020] In the figure: 1. transmission shaft; 2. telescopic sleeve; 3. hollow cylinder; 4. spring; 5. sealing sleeve; 6. through groove; 7. hollow sleeve; 8. oil storage tank; 9. oil level sensor; 10. oil filling pipe; 11. sealing plug; 12. empty groove; 13. air bag; 14. piston; 15. oil drain hole; 16. hollow chamber; 17. controller; 18. air pump; 19. alarm; 20. sound drain hole; 21. shock-absorbing layer; 23. sound-absorbing cotton; 24. oil valve. DETAILED DESCRIPTION

[0021] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0022] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0023] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0024] In the description of this embodiment, the terms "upper", "lower", "right", etc., directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0025] Under the existing technology, when the drive shaft is transmitted between the two universal joints, the vibrations of other components at both ends of the drive shaft will be completely transmitted to the telescopic sleeve. Since the telescopic sleeve is hollow, resonance will be caused on the telescopic sleeve, which will cause the drive shaft to emit huge noise and affect the comfort during driving.

[0026] In order to solve the above problems, Figures 1 to 4As shown, the present invention provides a noise reduction transmission shaft, including a telescopic sleeve 2, universal joints are installed on both sides of the telescopic sleeve 2, the telescopic sleeve 2 is inserted into a through groove 6 in a hollow cylinder 3, a hollow sleeve 7 is arranged on the outer periphery of the through groove 6, the hollow sleeve 7 is divided into an oil storage tank 8 and an empty groove 12, the oil storage tank 8 is installed on the upper side of the empty groove 12, the oil storage tank 8 is connected with the empty groove 12 through an oil valve 24, lubricating oil is stored in the oil storage tank 8, an oil drain hole 15 is arranged on the inner wall of the hollow sleeve 7 close to the oil valve 24, the oil drain hole 15 connects the empty groove 12 with the through groove 6, an air bag 13 is installed at one end of the empty groove 12 away from the oil valve 24, a piston 14 is installed at the front end of the air bag 13, a hollow chamber 16 is arranged in the hollow cylinder 3, an air pump 18 is installed in the hollow chamber 16, the air pump 18 is connected with the air bag 13, and the hollow cylinder 3 is flexibly connected to the vehicle body.

[0027] An additional hollow tube 3 is added to the telescopic sleeve 2. Due to the added weight on the telescopic sleeve 2, the vibration of the telescopic sleeve 2 can be suppressed, and thus the noise generated by the telescopic sleeve 2 can be suppressed. At the same time, the hollow tube 3 is flexibly connected to the vehicle body so that the vibration of the hollow tube 3 is absorbed by the flexible connection, which can also prevent the vibration noise from being transmitted to the vehicle body.

[0028] Usually, the present invention uses springs 4 to connect the vehicle body and the hollow cylinder 3. Springs 4 are installed on both sides of the hollow cylinder 3. The springs 4 connect the hollow cylinder 3 with the vehicle body. During the vibration of the hollow cylinder 3, the springs 4 will expand and contract. The expansion and contraction work of the springs 4 can consume the vibration caused by the expansion sleeve 2, and then the vibration on the expansion sleeve 2 is consumed by the springs 4, and finally the noise that can be transmitted from the transmission shaft 1 is reduced. When observed along the driving direction of the car, there is an eight-shaped angle between the two groups of springs 4, so that the hollow cylinder 3 can be subjected to elastic force from different directions, and then the vibration on the hollow cylinder 3 can be fully transmitted to the springs 4, so that the spring 4 has a stronger ability to suppress vibration and noise.

[0029] In order to suppress the friction noise generated during the rotation of the telescopic sleeve 2 between the hollow sleeves 7, lubricating oil is stored in the oil storage tank 8, and the airbag 13 is inflated by the air pump 18. Finally, the volume of the airbag 13 increases, and the cylinder will push the piston 14 at the front end to move. The oil valve 24 at the bottom of the oil storage tank 8 is opened, and the lubricating oil will enter the empty groove 12 from the oil valve 24. The piston 14 pushes the lubricating oil to flow out from the oil drain hole 15 to the gap between the telescopic sleeve 2 and the through groove 6, and the telescopic sleeve 2 and the hollow cylinder 3 are lubricated by the lubricating oil, reducing the friction force generated by the friction between the hollow cylinder 3 and the telescopic sleeve 2, reducing the noise transmitted by the telescopic sleeve 2 after the two contact each other, reducing the noise generated by the transmission shaft 1, and improving the comfort of the vehicle during use. The oil valve 24 of this method can be directly controlled to open and close by the controller 17, and then opened when the empty groove 12 needs lubricating oil.

[0030] During the expansion of the airbag 13, the piston 14 moves slowly. Since the hollow cylinder 3 and the telescopic sleeve 2 are in a long-term working state, when friction noise appears at the position of the transmission shaft 1, the airbag 13 is inflated by the air pump 18, which can push the piston 14 to move slightly, so that the oil discharge hole 15 can discharge a small amount of lubricating oil, so that the telescopic sleeve 2 can be lubricated for a long time, extending the lubrication time.

[0031] Since the empty groove 12 is arranged at the bottom, the oil drain hole 15 is arranged at the top of one side of the empty groove 12. The oil drain holes 15 of the present invention are provided with four groups, and the oil drain holes 15 are distributed sequentially along the height direction. In the process of the piston 14 squeezing the lubricating oil, the four groups of oil drain holes 15 can squeeze the lubricating oil onto the telescopic sleeve 2 at the same time to lubricate the telescopic sleeve 2, so that the telescopic sleeve 2 and the hollow cylinder 3 can be fully lubricated, thereby reducing the friction between the telescopic sleeve 2 and the hollow cylinder 3.

[0032] An oil level sensor 9 is installed at the bottom of the oil storage tank 8 , a controller 17 is installed in the hollow bin 16 , and the controller 17 is electrically connected to the oil level sensor 9 , and an alarm 19 is installed in the hollow bin 16 , and the alarm 19 is electrically connected to the controller 17 .

[0033] The oil level sensor 9 can monitor the height of the oil level in the oil storage tank 8. If the oil level is too low, it can send a signal to the controller 17, and the controller 17 can send an alarm signal to the alarm 19, so as to promptly notify the driver or maintenance personnel to replenish the lubricating oil in time, so that the telescopic sleeve 2 and the hollow cylinder 3 can always be kept in a lubricated state, reducing the probability of noise.

[0034] The controller 17 of the present invention is also electrically connected to the air pump 18. The controller 17 controls the start and stop of the air pump 18, and can also control the air pump 18 to rotate forward or reverse, thereby enabling the controller 17 to control the airbag 13 to expand or contract, and finally controls the direction of movement of the piston 14, so that the piston 14 can move back and forth in the empty groove 12. During the process of filling the lubricating oil, air can be pumped out from the airbag 13 to cause it to contract, leaving space in the empty groove 12 for filling the lubricating oil. When the lubricating oil needs to be discharged from the oil drain hole 15, air can be inflated into the airbag 13 to push the piston 14 to squeeze the oil.

[0035] The hollow cylinder 3 of the present invention is provided with a sound exhaust hole 20, which is connected to the hollow chamber 16, so that the sound of the alarm 19 can be broadcast to the outside in time through the sound exhaust hole 20. At the same time, during the operation of the air pump 18, the outside air can be absorbed through the sound exhaust hole 20 in time, or the air in the airbag 13 can be discharged. In this way, the airbag 13 can be more efficient in contraction and expansion, and the lubricating oil can be discharged between the telescopic sleeve 2 and the hollow cylinder 3 in time.

[0036] Sealing sleeves 5 are installed at both ends of the telescopic sleeve 2, and the sealing sleeves 5 are clamped at the two ends of the hollow sleeve 7. Openings are formed on both sides of the hollow cylinder 3 of the present invention. The lubricating oil in the telescopic platform can be sealed by the sealing sleeves 5 to prevent leakage of the lubricating oil. At the same time, if it is necessary to clean the oil storage tank 8 and the empty slot 12, the sealing sleeves 5 can be directly removed, and the oil storage tank 8 and the empty slot 12 can be cleaned to reduce the probability of blockage, thereby improving safety.

[0037] An oil filling pipe 10 is provided on the hollow cylinder 3, and a sealing plug 11 is installed on the oil filling pipe 10. The oil filling pipe 10 is connected to the oil storage tank 8. After the sealing plug 11 is removed, lubricating oil can be added directly through the oil filling pipe 10. After the lubricating oil inside the oil storage tank 8 is used up, adding lubricating oil in this way can improve the convenience of adding lubricating oil and improve safety.

[0038] Sound-absorbing cotton 23 is wrapped on the outside of the hollow sleeve 7. The sound-absorbing cotton 23 absorbs the noise generated on the transmission shaft 1, thereby achieving a noise reduction effect. A shock-absorbing layer 21 is installed between the sound-absorbing cotton 23 and the hollow sleeve 7. The material of the shock-absorbing layer 21 is rubber. By adding rubber, the noise generated by the transmission shaft 1 during operation can also be reduced. The sound-absorbing cotton 23 and rubber can absorb noises of different frequencies, thereby ultimately reducing the noise transmitted by the transmission shaft 1.

[0039] Two layers of material are formed inside the hollow tube 3, one side close to the telescopic sleeve 2 is rubber, and sound-absorbing cotton is installed on the outer periphery of the rubber. Since the telescopic sleeve 2 vibrates frequently, the stronger vibration of the rubber below the core can suppress most of the noise, and then the sound-absorbing cotton 23 absorbs the vibration with lower frequency amplitude, which can make the sound absorption effect of the hollow tube 3 better.

[0040] Working principle: when the transmission shaft 1 is used for the first time, the sealing plug 11 is opened, and then the lubricating oil is poured into the oil filling pipe 10, and then enters the interior of the oil storage tank 8 through the oil filling pipe 10. When the automobile transmission shaft 1 is working, the spline teeth on the outer wall of the spline shaft cooperate with the spline grooves on the inner wall of the telescopic sleeve 2. When the two cooperate, mechanical noise of friction cooperation is generated, and the mechanical noise is transmitted to the transmission shaft 1. The controller 17 controls the oil valve 24 to open, and then the lubricating oil in the oil storage tank 8 is discharged from the position of the oil valve 24 into the empty groove 12, and the lubricating oil at this time is located on one side of the piston 14. Then the controller 17 controls the air pump 18 to start, and the air pump 18 is discharged to the exhaust pipe. Gas is injected into the airbag 13, and then the airbag 13 expands and moves the piston 14 in the empty groove 12. When the piston 14 moves, it pushes the lubricating oil to move, and then the lubricating oil is discharged from the oil drain hole 15 into the through groove 6, and the lubricating oil is added between the telescopic sleeve 2 and the hollow cylinder 3 to facilitate the rotation of the transmission shaft 1. At the same time, adding lubricating oil can reduce friction and thus achieve disguised noise reduction. The oil level sensor 9 monitors the lubricating oil in the oil storage tank 8, and then transmits the oil level signal in the oil storage tank 8 to the controller 17. When the controller 17 receives the signal that the oil level has bottomed out, it controls the alarm 19 to alarm, and then the alarm sound is transmitted from the sound discharge hole 20, reminding the owner to add lubricating oil during maintenance.

[0041] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A noise-reducing transmission shaft, characterized in that: The invention comprises a telescopic sleeve (2), universal joints are installed on both sides of the telescopic sleeve (2), the telescopic sleeve (2) is inserted into a through groove (6) in a hollow cylinder (3), a hollow sleeve (7) is arranged on the outer periphery of the through groove (6), the hollow sleeve (7) is divided into an oil storage tank (8) and an empty groove (12), the oil storage tank (8) is installed on the upper side of the empty groove (12), the oil storage tank (8) is connected with the empty groove (12) through an oil valve (24), lubricating oil is stored in the oil storage tank (8), and the inner wall of the hollow sleeve (7) is close to the through groove (6). An oil drain hole (15) is provided on one side of the oil valve (24), and the oil drain hole (15) connects the hollow groove (12) and the through groove (6); an air bag (13) is installed at one end of the hollow groove (12) away from the oil valve (24); a piston (14) is installed at the front end of the air bag (13); a hollow chamber (16) is provided in the hollow cylinder (3), and an air pump (18) is installed in the hollow chamber (16); the air pump (18) is connected to the air bag (13); and the hollow cylinder (3) is flexibly connected to the vehicle body.

2. The noise reduction transmission shaft according to claim 1, characterized in that: The oil drain holes (15) are provided in four groups, and the oil drain holes (15) are distributed in sequence along the height direction.

3. The noise reduction transmission shaft according to claim 1, characterized in that: An oil level sensor (9) is installed at the bottom of the oil storage tank (8), a controller (17) is installed in the hollow bin (16), the controller (17) is electrically connected to the oil level sensor (9), and an alarm (19) is installed in the hollow bin (16), the alarm (19) is electrically connected to the controller (17).

4. The noise reduction transmission shaft according to claim 3, characterized in that: The controller (17) is also electrically connected to the air pump (18), and the controller (17) controls the start and stop of the air pump (18).

5. The noise reduction transmission shaft according to claim 3, characterized in that: The hollow cylinder (3) is provided with a sound discharge hole (20), and the sound discharge hole (20) is communicated with the hollow chamber (16).

6. The noise reduction transmission shaft according to claim 1, characterized in that: Sealing sleeves (5) are installed at both ends of the telescopic sleeve (2), and the sealing sleeves (5) are clamped on both ends of the hollow sleeve (7).

7. The noise reduction transmission shaft according to claim 1, characterized in that: The hollow cylinder (3) is provided with an oil filling pipe (10), a sealing plug (11) is installed on the oil filling pipe (10), and the oil filling pipe (10) is connected to the oil storage tank (8).

8. The noise reduction transmission shaft according to claim 1, characterized in that: Springs (4) are respectively installed on both sides of the hollow cylinder (3), and the other end of the spring (4) is connected to the bottom of the frame.

9. The noise reduction transmission shaft according to claim 1, characterized in that: The outer side of the hollow sleeve (7) is wrapped with sound-absorbing cotton (23).

10. The noise reduction transmission shaft according to claim 9, characterized in that: A shock-absorbing layer (21) is installed between the sound-absorbing cotton (23) and the hollow sleeve (7), and the shock-absorbing layer (21) is made of rubber.

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