A noise-reducing drive shaft

Abstract

The present invention belongs to the technical field of automobile noise reduction and discloses a noise-reducing drive shaft. The drive shaft comprises a telescopic sleeve, universal joints are installed on both sides of the telescopic sleeve, the telescopic sleeve is inserted into a through slot in a hollow cylinder, a hollow sleeve is provided on the outer periphery of the through slot, the hollow sleeve is divided into an oil storage tank and an empty slot, the oil storage tank is installed above the empty slot and is connected to the empty slot via an oil valve, the oil storage tank stores lubricating oil, an oil drain hole is provided on the inner wall of the hollow sleeve near the oil valve, the oil drain hole connects the empty slot with the through slot, an airbag is installed at the end of the empty slot 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 to the airbag, and the hollow cylinder is flexibly connected to the vehicle body. The drive shaft of the prior art solves the problem of generating loud noise during vehicle driving caused by the existing technology.

Description

Technical Field

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

[0002] The drive shaft is the shaft in a universal joint that transmits power. It is a high-speed, low-support rotating body. In front-engine, rear-wheel drive vehicles, it transmits the rotation of the transmission to the final drive shaft, with universal joints connecting the 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 components connected to the drive shaft will be transmitted to the cavity inside the drive shaft through the welding fork and spline shaft on the drive shaft. The above two vibrations are collected 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 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 in the prior art that the transmission shaft generates huge noise during vehicle driving.

[0005] To achieve this object, the present invention adopts the following technical solution: the present invention provides a noise-reducing transmission shaft, comprising 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 provided 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 and the through groove, an airbag is installed at the 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, four groups of oil drain holes are provided, 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, and an alarm is installed in the hollow bin, 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 discharge hole, and the sound discharge 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 connected to 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 flexible connection of the hollow cylinder can also absorb the vibration of the telescopic sleeve. 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, pushing the piston to move toward the side of the oil valve, and 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, 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 This 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 It is a cross-sectional view of the hollow cylinder of the present invention;

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

[0020] In the figure: 1. Drive 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. Airbag; 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 with reference to the accompanying drawings and examples. It will be understood that the specific embodiments described herein are intended only to illustrate the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all structures.

[0022] In the description of the present invention, unless otherwise expressly specified or limited, the terms "connected," "connected," and "fixed" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention in specific circumstances.

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

[0024] In the description of this embodiment, the terms "upper," "lower," "right," and other orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely for ease of description and simplified operation. They do not indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meanings.

[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 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, affecting the comfort during driving.

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

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

[0028] Generally, 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 to connect the hollow cylinder 3 to 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 telescopic sleeve 2, and then the vibration on the telescopic 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 direction of travel of the car, the two groups of springs 4 form an eight-shaped angle, so that the hollow cylinder 3 can be subjected to elastic force from different directions, and the vibration on the hollow cylinder 3 can be fully transmitted to the springs 4, so that the springs 4 have a stronger ability to suppress vibration and noise.

[0029] In order to suppress the friction noise generated by the rotation of the telescopic sleeve 2 between the hollow sleeves 7, lubricating oil is stored in the oil reservoir 8. The airbag 13 is inflated by the air pump 18. Eventually, 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 reservoir 8 opens, and the lubricating oil will flow from the oil valve 24 into the empty groove 12. The piston 14 pushes the lubricating oil out of the oil drain hole 15 into the gap between the telescopic sleeve 2 and the through groove 6, lubricating the telescopic sleeve 2 and the hollow cylinder 3 with the lubricating oil, reducing the friction 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 drive shaft 1, and improving the comfort during vehicle 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 occurs 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 drain hole 15 can discharge a small amount of lubricating oil. In this way, 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 in sequence along the height direction. In the process of the piston 14 squeezing the lubricating oil, the four groups of oil drain holes 15 can simultaneously squeeze out the lubricating oil onto the telescopic sleeve 2 to lubricate the telescopic sleeve 2, so that the telescopic sleeve 2 and the hollow cylinder 3 can be lubricated in all directions, 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. The controller 17 can send an alarm signal to the alarm 19, which can then promptly notify the driver or maintenance personnel to replenish the lubricating oil. In this way, 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 at the same time can 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 adding lubricating oil, air can be pumped out from the airbag 13 to cause it to shrink, leaving space in the empty groove 12 for adding 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 discharge hole 20, which is connected to the hollow chamber 16, so that the sound of the alarm 19 can be broadcast to the outside world in time through the sound discharge hole 20. At the same time, during the operation of the air pump 18, the outside air can be absorbed through the sound discharge hole 20 in time, or the air in the airbag 13 can be discharged. In this way, the efficiency of contraction and expansion of the airbag 13 can be higher, and the lubricating oil can be discharged to 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 both 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 through the sealing sleeves 5 to prevent the lubricating oil from leaking. At the same time, if the oil storage tank 8 and the empty tank 12 need to be cleaned, the sealing sleeves 5 can be directly removed, and the oil storage tank 8 and the empty tank 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 around 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, and ultimately reduce the noise transmitted by the transmission shaft 1.

[0039] Two layers of material are formed inside the hollow tube 3, of which the side close to the telescopic sleeve 2 is rubber, and sound-absorbing cotton is installed on the outside of the rubber. Since the telescopic sleeve 2 vibrates more frequently, the stronger vibration below the core of the rubber can suppress most of the noise. 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, the mechanical noise of friction cooperation is generated. The mechanical noise is transmitted to the transmission shaft 1, and the controller 17 controls the oil valve 24 to open. After that, the lubricating oil inside 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 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, adding lubricating oil 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 the purpose of clearly illustrating the present invention and are not intended to limit the embodiments of the present invention. A person skilled in the art would be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is not necessary and impossible to enumerate all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection 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 provided 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 to 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 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), and 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. The outer side of the hollow sleeve (7) is wrapped with sound-absorbing cotton (23); A shock-absorbing layer (21) is installed between the sound-absorbing cotton (23) and the hollow sleeve (7), and the material of the shock-absorbing layer (21) is rubber.

2. The noise reduction drive 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 drive 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 chamber (16), and the controller (17) is electrically connected to the oil level sensor (9), and an alarm (19) is installed in the hollow chamber (16), and the alarm (19) is electrically connected to the controller (17).

4. The noise reduction drive 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 drive 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 at both ends of the hollow sleeve (7).

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

8. The noise reduction drive 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 vehicle frame.

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