CN109780082B

CN109780082B - Hydro-viscous speed regulation clutch

Info

Publication number: CN109780082B
Application number: CN201910238722.3A
Authority: CN
Inventors: 廖湘平; 夏毅敏; 龚国芳; 王洋; 史余鹏; 傅杰; 肖雪萌; 胡东; 唐川林
Original assignee: Central South University
Current assignee: Central South University
Priority date: 2019-03-27
Filing date: 2019-03-27
Publication date: 2020-02-07
Anticipated expiration: 2039-03-27
Also published as: CN109780082A

Abstract

The embodiment of the invention discloses a hydro-viscous speed regulation clutch, which comprises the following components: the transmission device comprises a driving shaft, a supporting disc, a driving friction plate, a driven drum, a driven disc and a driven shaft; the control device is positioned in the transmission device and comprises a piston, a spring top disc and an automatic oil supplementing device, the automatic oil supplementing device is arranged on the driven shaft and positioned in the accommodating space, and the automatic oil supplementing device comprises an oil tank, a directional valve, a first oil duct hose, a second oil duct hose, a signal amplifier, a pressure sensor and a signal control unit. When the output speed fluctuates, the oil can be supplemented through the automatic oil supplementing device. The automatic oil supplementing device can greatly reduce the speed fluctuation problem of the hydro-viscous speed regulation clutch under the control oil pressure lower than 0.5MPa, and improves the output stability and accuracy of the hydro-viscous speed regulation clutch to a great extent.

Description

Hydro-viscous speed regulation clutch

Technical Field

The invention relates to the technical field of clutches, in particular to a hydro-viscous speed regulation clutch, and also relates to a hydro-viscous speed regulation device capable of being applied to a low-pressure system to reduce speed fluctuation.

Background

The Hydro-viscous speed regulation clutch belongs to a transmission device, and the applied technology is Hydro-viscous Drive (HVD) based on Newton's law of internal friction, namely, the Hydro-viscous Drive transfers power by utilizing the shearing action of an oil film between a driving friction plate and a driven friction plate, can work under the condition of slipping for a long time, and can realize synchronous transmission between the driving shaft and the driven shaft. The hydro-viscous speed regulation clutch has excellent speed regulation performance and can realize stepless speed regulation. The hydro-viscous speed regulation clutch is widely applied to speed regulation of various working machines such as high-power water pumps and fans, can effectively solve the problem of energy waste generated by the various working machines such as the water pumps and the fans, and has a very obvious energy-saving effect.

The output stability and accuracy are important indexes for measuring the working performance of the hydro-viscous speed regulation clutch. The common hydro-viscous speed regulation clutch generally adopts an electro-hydraulic proportional relief valve to control the oil pressure of a system so as to regulate the size of a gap between a driving friction plate and a driven friction plate and further regulate the rotating speed of output torque. Due to the problems of dead zones and the like, the working condition of the electro-hydraulic proportional overflow valve in a low-pressure environment below 0.5MPa is poor, the problem of fluctuation of the output rotating speed of the hydro-viscous speed regulation clutch is difficult to inhibit, and the speed fluctuation is amplified due to the internal structure problem of the common hydro-viscous speed regulation clutch. For example, when the output rotating speed suddenly rises, the speed of the piston cylinder of the hydro-viscous speed regulation clutch also suddenly rises, and the centrifugal oil pressure of the corresponding piston cylinder suddenly increases, so that the clearance between the driving friction plate and the driven friction plate is further reduced, and the output rotating speed is further increased, and vice versa. This problem is one of the key issues that must be overcome to improve the output stability and accuracy of the hydro-viscous speed-regulating clutch. In addition, many experts and scholars have proposed various technical solutions to solve the problem of speed fluctuation of the hydro-viscous speed regulation clutch so far, but most of the technical solutions are at the cost of extra energy loss. Therefore, it is necessary to develop a technical solution with no or low loss.

Disclosure of Invention

The embodiment of the invention provides a hydro-viscous speed regulation clutch, aiming at the problem of speed fluctuation generated when the existing hydro-viscous speed regulation clutch works under the low-pressure working condition of below 0.5 MPa.

In one aspect, the present invention provides a hydro-viscous speed-adjusting clutch, including: the transmission device comprises a driving shaft, a supporting disc, a driving friction plate, a driven drum, a driven disc and a driven shaft, wherein the driving friction plate is arranged on the driving shaft, the driven friction plate is arranged on the driven drum, the driven drum is respectively connected with the driven disc and the supporting disc, the driven disc is connected with the driven shaft, and a damping hole is formed in the driven disc; the control device is positioned in the transmission device and comprises a piston, a spring and a spring top disc, the piston is arranged on the driven shaft and positioned in the driven disc, a working oil cavity is formed between the piston and the driven disc and communicated with the damping hole, the spring top disc is arranged on the driven shaft and positioned in the piston, the spring is connected with the piston and the spring top disc and forms an accommodating space between the piston and the spring top disc, the piston is provided with a first opening and a second opening, and the spring top disc is provided with a third opening; and an automatic oil supply device which is arranged on the driven shaft and is positioned in the accommodating space, wherein the automatic oil supply device comprises an oil tank, a directional valve, a first oil duct hose, a second oil duct hose, a signal amplifier, a pressure sensor and a signal control unit, the oil tank is arranged on the driven shaft and connected with the spring top disc, the direction valve, the signal amplifier and the signal control unit are respectively arranged on the driven shaft, the first oil duct hose is communicated with the oil tank and the direction valve, the oil tank is communicated with the third opening, the second oil duct hose is communicated with the directional valve and the first opening, the pressure sensor is arranged in the second opening, the signal amplifier is electrically connected between the pressure sensor and the signal control unit, and the signal control unit is also connected with the directional valve.

On the other hand, the embodiment of the invention provides a hydro-viscous speed regulation clutch, which comprises: the transmission device comprises a driven disc and a driven shaft, and the driven disc is arranged on the driven shaft; the control device is positioned in the transmission device and comprises a piston, a spring and a spring top disc, the piston is arranged on the driven shaft and positioned in the driven disc, a working oil cavity is formed between the piston and the driven disc, the spring top disc is arranged on the driven shaft and positioned in the piston, the spring is connected with the piston and the spring top disc, an accommodating space is formed between the piston and the spring top disc, the piston is provided with a first opening and a second opening, and the spring top disc is provided with a third opening; the automatic oil supplementing device is arranged on the driven shaft and located in the accommodating space, the automatic oil supplementing device comprises a directional valve, a first oil duct hose, a second oil duct hose, a signal amplifier, a pressure sensor and a signal control unit, the directional valve, the signal amplifier and the signal control unit are respectively arranged on the driven shaft, the first oil duct hose is communicated with the directional valve and the third opening, the second oil duct hose is communicated with the directional valve and the first opening, the pressure sensor is arranged in the second opening, the signal amplifier is electrically connected between the pressure sensor and the signal control unit, and the signal control unit is further connected with the directional valve.

In one embodiment of the invention, a damping hole is arranged on the driven disc, and the damping hole is communicated with the working oil cavity.

In an embodiment of the present invention, the hydro-viscous speed regulation clutch further includes a driven shaft transparent cover sleeved on the driven shaft, and the driven shaft transparent cover is provided with a first radial oil passage; the driven shaft is provided with a second radial oil duct, a first axial oil duct and a third radial oil duct, the first radial oil duct is connected with the second radial oil duct, two ends of the first axial oil duct are respectively connected with the second radial oil duct and the third radial oil duct, and the third radial oil duct is connected with the working oil cavity.

In one embodiment of the invention, the transmission device further comprises a driving shaft, a supporting disc, a driving friction plate, a driven friction plate and a driven drum, wherein the driving friction plate is arranged on the driving shaft, the driven friction plate is arranged on the driven drum, and the driven drum is connected with the driven disc and the supporting disc.

In an embodiment of the present invention, the hydro-viscous speed-adjusting clutch further includes a driving shaft transparent cover disposed on the driving shaft, and a fourth radial oil passage on the driving shaft transparent cover; the driving shaft is provided with a fifth radial oil duct, a second axial oil duct, a sixth radial oil duct and a branch oil duct, the fourth radial oil duct is connected with the fifth radial oil duct, two ends of the second axial oil duct are respectively connected with the fifth radial oil duct and the sixth radial oil duct, and the branch oil duct is communicated with the sixth radial oil duct and the third opening.

In an embodiment of the present invention, the hydro-viscous speed-adjusting clutch further includes an oil passage disc, the oil passage disc is disposed between the spring top disc and the driving shaft, and a seventh radial oil passage is formed between the oil passage disc and the driving shaft, and the seventh radial oil passage connects the oil distribution passage and the third opening.

In one embodiment of the present invention, the signal control unit comprises a microprocessor, an analog-to-digital converter and a digital-to-analog converter, the microprocessor is connected between the analog-to-digital converter and the digital-to-analog converter, the analog-to-digital converter is connected with the signal amplifier, and the digital-to-analog converter is connected with the direction valve.

In one embodiment of the invention, the directional valve is a solenoid directional valve.

In an embodiment of the present invention, the automatic oil supply device further includes an oil tank, the oil tank is disposed on the driven shaft and connected to the spring top plate, and the first oil passage hose is connected to the third opening through the oil tank.

One or more of the above solutions may have the following advantages: according to the embodiment of the invention, the automatic oil supplementing device is arranged in the hydro-viscous speed regulation clutch, so that the problem of output speed fluctuation under the control oil pressure lower than 0.5MPa is solved, and the output stability and accuracy of the hydro-viscous speed regulation clutch are improved to a great extent. In addition, the oil source of the oil inlet of the automatic oil supplementing device is lubricating oil, and the output rotating speed fluctuation of the clutch can be reduced on the premise of not additionally arranging other additional oil sources or increasing additional energy loss because the oil pressure of the lubricating oil is 0.5 MPa. In addition, the output speed fluctuation is further reduced by reducing the oil pressure in the working oil chamber by opening a damping hole in the driven plate. Moreover, the oil tank is arranged in the automatic oil supplementing device, so that the oil supplementing response speed of the automatic oil supplementing device can be increased, and the output speed can be stabilized more quickly; in addition, an oil duct disc is arranged between the spring top disc and the driving shaft, so that lubricating oil is guided and controlled to flow to the automatic oil supplementing device, the oil supplementing response speed can be further improved, the waste of the lubricating oil can be reduced, and the cost is saved.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a hydro-viscous speed-adjusting clutch according to an embodiment of the present invention.

Fig. 2 is a schematic diagram of the lubrication oil passage and the control oil passage when the hydro-viscous speed-adjusting clutch shown in fig. 1 is operated.

Fig. 3a is a partially enlarged view of the area a in fig. 2.

Fig. 3b is a schematic circuit connection diagram of an automatic oil replenishing device according to an embodiment of the present invention.

Fig. 3c is another schematic circuit connection diagram of an automatic oil replenishing device according to an embodiment of the present invention.

Fig. 3d is a schematic circuit connection diagram of an automatic oil replenishing device according to an embodiment of the present invention.

Fig. 3e is a partially enlarged view of the automatic oil supply apparatus of another structure in the area a of fig. 2.

Fig. 4 is a partially enlarged view of the region B in fig. 2.

Fig. 5a is a schematic diagram of a lubrication oil path and a control oil path when another hydro-viscous speed-adjusting clutch provided by the embodiment of the invention works.

Fig. 5b is a partial enlarged view of the area C in fig. 5 a.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

As shown in fig. 1, an embodiment of the present invention provides a hydro-viscous speed-adjusting clutch 200. The hydro-viscous clutch 200 includes, for example, a transmission, a control device, and an automatic oil supply device, and other peripheral devices such as a case, a driving shaft transparent cover 27, a driven shaft transparent cover 20, a driving end cover 31, and a driven end cover 32.

The case includes, for example, an upper case 9 and a lower case 23. The upper box 9 is arranged on the upper part of the lower box 23 and forms a hollow shell structure with the lower box 23. The first side of the upper box 9 and the lower box 23 after combination is connected with the driving shaft transparent cover 27 and the driving end cover 31 in sequence, and the second side opposite to the first side is connected with the driven shaft transparent cover 20 and the driven end cover 32 in sequence.

The transmission device is arranged in the box body. Specifically, the transmission device includes, for example, a driving shaft 1, a support plate 5, a driving friction plate 6, a driven friction plate 7, a driven drum 8, a driven plate 10, and a driven shaft 19. The drive shaft 1 is mounted on the housing, for example, by means of a roller bearing 2. The driving friction plate 6 is mounted on the driving shaft 1, the driven friction plate 7 is mounted on the driven drum 8, the driven drum 8 is fixedly connected with the driven disc 10 and the supporting disc 5 through bolts and the like, and the driven disc 10 is connected with the driven shaft 19 through bolts 17. The support disc 5 is also mounted on the box by means of rolling bearings 3.

As shown in fig. 1 to 3a, the control means comprise, for example, a piston 11, a spring 13 and a spring top disk 26. The piston 11 is arranged on the driven shaft 19 and positioned in the driven disc 10, and a working oil chamber 28 is formed between the piston 11 and the driven disc 10. The spring top disk 26 is arranged on the driven shaft 19 and located in the piston 11, and the spring 13 is connected with the piston 11 and the spring top disk 26 and forms a containing space 40 between the piston 11 and the spring top disk 26. The piston 11 is provided with a first opening 41 and a second opening 42, and the spring top disk 26 is provided with a third opening 43. The first opening 41, the second opening 42, and the third opening 43 are through holes.

Referring to fig. 2, the hydro-viscous shifting clutch 200 further includes a lubrication oil path and a control oil path. The driving shaft transparent cover 27 is provided with a radial oil duct 27a, the radial oil duct 27a is communicated with an external lubricating oil system, and the driving shaft transparent cover 27 is sleeved on the driving shaft 1 and is in dynamic sealing connection with the driving shaft 1. The driving shaft 1 is provided with a radial oil duct 1a, an axial oil duct 1b, a radial oil duct 1c and an oil distribution duct 1 d. The lubricating oil path passage includes a radial oil passage 27a, a radial oil passage 1a, an axial oil passage 1b, a radial oil passage 1c, and a branch oil passage 1 d. The radial oil duct 27a of the driving shaft transparent cover 27 is communicated with the radial oil duct 1a, the radial oil duct 1a of the driving shaft 1 is communicated with the axial oil duct 1b, the axial oil duct 1b is communicated with the radial oil duct 1c, and the radial oil duct 1c is communicated with the branch oil duct 1 d. The driven shaft transparent cover 20 is provided with a radial oil passage 20a, and the radial oil passage 20a is communicated with an external control oil system, and the oil pressure of the external control oil system is 0.5MPa, for example. The driven shaft transparent cover 20 is sleeved on the driven shaft 19 and is in dynamic sealing connection with the driven shaft 19. The driven shaft 19 is provided with a radial oil passage 19a, an axial oil passage 19b, and a radial oil passage 19 c. The control oil passage includes a radial oil passage 20a, a radial oil passage 19a, an axial oil passage 19b, and a radial oil passage 19 c. The radial oil passage 20a of the driven shaft through cover 20 is communicated with the radial oil passage 19a, the radial oil passage 19a is communicated with the axial oil passage 19b, the axial oil passage 19b is communicated with the radial oil passage 19c, and the radial oil passage 19c is communicated with the working oil chamber 28 in the piston 11.

Referring to fig. 2, 3a and 3b, the hydro-viscous shifting clutch 200 further includes an automatic oil replenishment device. The automatic oil replenishment device includes, for example, a directional valve 14, an oil passage hose 33, an oil passage hose 15, a signal amplifier 16, a pressure sensor 18, and a signal control unit 45. The oil-passage hose 33 communicates with the directional valve 14 and the third opening 43, the oil-passage hose 15 communicates with the directional valve 14 and the first opening 41, and the pressure sensor 18 is disposed in the second opening 42. The directional valve 14, the signal amplifier 16 and the signal control unit 45 are respectively provided on the passive shaft 19. The signal amplifier 16 is electrically connected between the pressure sensor 18 and the signal control unit 45, the signal control unit 45 also being connected to the directional valve 14. The pressure sensor 18 is, for example, a BP8A type diffused silicon pressure transmitter, and detects the oil pressure in the working oil chamber 28, and converts the pressure signal into an electric signal to output the electric signal. The pressure sensor 18 converts the sensed pressure parameter into an electrical signal and transmits it to the signal amplifier 16 for amplification by the signal amplifier 16. The signal amplifier 16 sends the amplified electric signal to the signal control unit 45. The signal control unit 45 comprises, for example, a microprocessor 451, such as a single chip microcomputer of the type STC89C52RC, which is adapted to receive the electrical signals sent by the signal amplifier 16 and to monitor the variations of said electrical signals in real time. When the oil pressure in the working oil chamber 28 is suddenly reduced, the electrical signal output by the pressure sensor 18 is also suddenly reduced, and when the signal control unit 45 monitors the electrical signal with suddenly reduced amplitude, the signal control unit sends a control signal to the directional valve 14 to control the opening of the directional valve so as to allow the lubricating oil to pass through, and the oil is supplied to the working oil chamber 28 through the oil passage hose 15 and the first opening 41. The directional valve 14 may be, for example, a two-position, four-way solenoid directional valve. The automatic oil replenishing device further includes a power source (not shown in the figure). The power source may be, for example, a battery for supplying power to the directional valve 14, the signal amplifier 16, the pressure sensor 18, the signal control unit 45, and the like. The number of the automatic oil supply devices may be one, or may be plural ones symmetrically arranged with respect to the axis of the driven shaft 19. When the number of the automatic oil supply devices is plural, the oil supply speed of the automatic oil supply device is faster when speed fluctuation occurs, which is advantageous for the hydro-viscous speed-adjusting clutch 200 to stabilize the output speed more quickly. The signal control unit 45 may further include an analog-to-digital converter 452 and a digital-to-analog converter 453. The microprocessor 451 is connected between the analog-to-digital converter 452 and the digital-to-analog converter 453 (see fig. 3 c). The analog-to-digital converter 452 is connected to the signal amplifier 16 to receive the electrical signal from the signal amplifier 16 to convert the electrical signal into a digital signal and transmit into the microprocessor 451. The microprocessor 451 outputs a corresponding digital signal to the digital-to-analog converter 453, so that the digital-to-analog converter 453 converts the digital signal into an analog signal and outputs the analog signal to the directional valve 14 to control the operation of the directional valve 14. The analog-to-digital converter 452 is, for example, ADC 0809. The digital-to-analog converter 453 is, for example, a DAC 1232. A signal amplifier 46 may also be provided between the digital-to-analog converter 453 and the directional valve 14 to further amplify the signal output by the digital-to-analog converter 453 in order to better control the action of the directional valve 14 (see fig. 3 d).

It should be noted here that the position of the automatic oil supply device is not limited to the driven shaft 19, and may be provided on the piston 11 or the spring top plate 26, or may be separately provided on the piston 11, the driven shaft 19, and the spring top plate 26.

As shown in fig. 2, the lubricating oil paths of the fluid viscosity shifting clutch 200 are: firstly, the external lubricating oil system flows in lubricating oil through the radial oil duct 27a of the driving shaft transparent cover 27, the lubricating oil firstly flows into the radial oil duct 1a of the driving shaft 1 and then flows into the axial oil duct 1b of the driving shaft 1, then flows into the oil distribution channel 1d of the driving shaft 1 through the radial oil duct 1c of the driving shaft 1, and then flows between the driving friction plate 6 and the driven friction plate 7 through the small hole on the oil distribution channel 1d of the driving shaft 1.

As shown in fig. 2, the control oil path of the fluid viscosity shifting clutch 200 is: first, the external control oil system flows in the control oil through the radial oil passage 20a of the driven shaft through cover 20, and the control oil flows into the radial oil passage 19a of the driven shaft 19, then flows into the axial oil passage 19b of the driven shaft 19, and then flows into the working oil chamber 28 through the radial oil passage 19c of the driven shaft 19.

As shown in fig. 2 and 3a, the lubricating oil supply passage of the fluid viscosity shifting clutch 200 is: the oil in the branch oil passage 1d of the drive shaft 1 flows to the directional valve 14 through the third opening 43. The directional valve 14 controls the flow of oil to the working oil chamber 28 through the gallery hose 15 and the first opening 41. When the output speed suddenly drops, the pressure of the working oil in the working oil cavity 28 correspondingly suddenly drops, so that the pressure of the working oil is increased by oil supplement of the lubricating oil, the gap between the active friction plate and the passive friction plate is reduced, the oil film shearing force between the active friction plate 6 and the passive friction plate 7 is increased, the output rotating speed is increased, and finally the output rotating speed is kept stable.

Further, as shown in fig. 3e, the automatic oil supply device may further include an oil tank 12. The oil tank 12 is arranged on the driven shaft 19 and is connected with a spring top disk 26. The oil-passage hose 33 is connected to the third opening 43 through the oil tank 12. Thus, a certain amount of lubricating oil can be stored in advance in the oil tank 12. When the speed changes, the oil can be more quickly supplemented from the oil tank 12 to stabilize the output speed. The oil tank 12 may be, for example, a trapezoidal circular truncated cone oil tank. The oil flows out to the directional valve 14 from the narrow side of the trapezoid. The oil tank throws out the inside lubricating oil along with the centrifugal force that the driven shaft 19 produced when high-speed rotatory, and the narrow end of keeping away from the rotation center makes the lubricating oil pressure of outflow great, more does benefit to the benefit of oil supplementation.

The lubricating oil supply passage of the fluid viscosity speed adjustment clutch 200 at this time is: the oil in the branch oil passage 1d of the drive shaft 1 flows into the oil tank 12 through the third opening 43. The directional valve 14 controls the flow of oil from the oil tank 12 to the working oil chamber 28 through the oil passage hose 33, the oil passage hose 15, and the first opening 41. When the output speed is suddenly reduced, the pressure of the working oil in the working oil cavity 28 is suddenly reduced correspondingly, so that the pressure of the working oil is increased by oil supplement of the lubricating oil, the gap between the dynamic friction plate 6 and the passive friction plate 7 is reduced, the oil film shearing force between the active friction plate 6 and the passive friction plate 7 is increased, the output rotating speed is increased, and finally the output rotating speed is kept stable.

Referring to fig. 2 and 4, the passive disk 10 is provided with a damping hole 29. The orifice 29 communicates with the working-oil chamber 28. The control oil discharge path of the fluid viscosity transmission clutch 200 at this time is: when the output speed is suddenly increased, the oil in the working oil chamber 28 is discharged through the damping hole 29 to reduce the pressure of the working oil, so that the gap between the driving friction plate 6 and the driven friction plate 7 is increased, the output rotating speed is reduced, and finally the output rotating speed is kept stable.

Still further, referring to fig. 5a and 5b, the control device may also include an oil passage disc 24. The gallery disks 24 are disposed between the sprung top disks 26 and the drive shaft 1. An oil passage 30 is formed between the oil passage disc 24 and the driveshaft 1. The oil passage 30 is connected between the branch oil passage 1d of the drive shaft 1 and the third opening 43 in the sprung top plate 26. In this way, the oil duct disc 24 guides and controls the lubricating oil between the spring top disc 26 and the driving shaft 1 to flow to the automatic oil supplementing device, and the waste of the lubricating oil is avoided.

The working principle of the automatic oil supplementing device designed by the invention is as follows: when the output rotation speed suddenly increases to generate a surge, the oil in the working oil chamber 28 flows out from the orifice 29. In addition, because the device has certain leakage and the pressure change is small, the output rotating speed fluctuation can be greatly reduced through the damping hole 29. When the output rotating speed is suddenly reduced to generate a fluctuation, the pressure in the working oil chamber 28 is suddenly reduced, the pressure sudden change triggers the pressure sensor 18 to generate an electric signal, the electric signal passes through the signal amplifier 16 and the signal control unit 45 to finally control the directional valve 14 to be opened, oil in the oil tank 12 flows out and flows into the working oil chamber 28 through the

oil passage hoses

33 and 15 and the first opening 41, and therefore the oil pressure in the working oil chamber 28 reaches a preset oil pressure, and the purpose of stabilizing the output speed is achieved.

It is to be noted here that the abrupt change in the output speed can be represented and discriminated by, for example, the speed of change in the pressure in the working-oil chamber 28 (the pressure change value per unit time). For example, a preset pressure variation speed is set in the microprocessor 451 of the signal control unit 45, and the preset pressure variation speed can be set according to different load conditions, which means that the problem of output rotation speed fluctuation of the hydro-viscous speed regulation clutch under different load conditions can be set according to actual conditions in a targeted manner. The microprocessor 451 of the signal control unit 45 monitors the pressure in the working-oil chamber 28 in real time and calculates the pressure change speed. When a sudden drop in pressure within the working-oil chamber 28 is detected and a predetermined pressure change rate is reached, the output speed is considered to have suddenly decreased, and the microprocessor 451 issues a control command to control the directional valve 14 to perform a corresponding operation. When the pressure in the working oil chamber 28 is monitored to be reduced but the preset pressure change speed is not reached, the hydro-viscous speed regulation clutch is indicated to be in a normal speed regulation working condition, the pressure change of the working oil chamber is normal regulation, and at the moment, the microprocessor 45 does not send a control instruction to the directional valve 14 to act, so that the oil supplementing error action of the automatic oil supplementing device is not caused, and the control electric signal is effectively prevented from being mistakenly sent due to the slow change of the control oil pressure. Further, the microprocessor 451 of the signal control unit 45 may also adjust the oil replenishment signal accordingly, according to the output rotation speed fluctuation problem of the hydro-viscous speed-adjusting clutch in different applications. For example: when the output rotating speed is reduced violently and the amplitude is large, the electric signal can be output to control the directional valve 14 to supplement oil quickly, and when the output rotating speed is reduced slowly and the amplitude is small, the electric signal can be output to control the directional valve 14 to supplement oil at a corresponding speed until the output rotating speed is stable. The output stability and accuracy of the clutch are improved to a great extent.

In summary, in the embodiment of the present invention, the automatic oil replenishing device is disposed inside the hydro-viscous speed-adjusting clutch 200, that is, the pressure sensitive element is used to accurately determine the sudden change of the control oil pressure so as to send out the corresponding control electrical signal, and the signal is amplified and then the electromagnetic valve is controlled to realize automatic oil replenishing, so as to solve the problem of output speed fluctuation under the control oil pressure lower than 0.5Mpa, effectively avoid the control electrical signal from being mistakenly sent due to the slow change of the control oil pressure, and improve the output stability and accuracy of the clutch to a great extent. In addition, the oil pressure in the working oil chamber 28 is further reduced by opening a damping hole 29 in the driven plate 10 to reduce the output speed fluctuation. Moreover, the oil tank is arranged in the automatic oil supplementing device, so that the oil supplementing response speed of the automatic oil supplementing device can be increased, and the output speed can be stabilized more quickly; in addition, an oil duct disc is arranged between the spring top disc and the driving shaft, so that lubricating oil is guided and controlled to flow to the automatic oil supplementing device, the oil supplementing response speed can be further improved, the waste of the lubricating oil can be reduced, and the cost is saved.

It should be noted that the signal amplifier, the signal control unit and other electrical components in the present invention are all packaged components and circuits, which can prevent oil from entering the electrical components to avoid damaging the electrical components. In addition, the signal amplifier, the signal control unit and the like in the real-time example of the present invention may also be replaced by electrical elements with similar functions to implement the technical solution provided by the present invention.

Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims

1. A hydro-viscous speed-governing clutch (200), comprising:

the transmission device comprises a driving shaft (1), a supporting disc (5), a driving friction plate (6), a driven friction plate (7), a driven drum (8), a driven disc (10) and a driven shaft (19), wherein the driving friction plate (6) is arranged on the driving shaft (1), the driven friction plate (7) is arranged on the driven drum (8), the driven drum (8) is respectively connected with the driven disc (10) and the supporting disc (5), the driven disc (10) is connected with the driven shaft (19), and a damping hole (29) is formed in the driven disc (10);

a control device which is positioned in the transmission device and comprises a piston (11), a spring (13) and a spring top disc (26), the piston (11) is arranged on the driven shaft (19) and is positioned in the driven disc (10), a working oil chamber (28) is formed between the piston (11) and the driven plate (10), the working oil chamber (28) is communicated with the damping hole (29), the spring top plate (26) is arranged on the driven shaft (19) and is positioned in the piston (11), the spring (13) connects the piston (11) and the spring top disk (26) and forms a receiving space (40) between the piston (11) and the spring top disk (26), a first opening hole (41) and a second opening hole (42) are formed in the piston (11), and a third opening hole (43) is formed in the spring top disc (26); and

the automatic oil supplementing device is arranged on the driven shaft (19) and located in the accommodating space (40), the automatic oil supplementing device comprises an oil tank (12), a directional valve (14), a first oil channel hose (33), a second oil channel hose (15), a signal amplifier (16), a pressure sensor (18) and a signal control unit (45), the oil tank (12) is arranged on the driven shaft (19) and connected with the spring top disc (26), the directional valve (14), the signal amplifier (16) and the signal control unit (45) are respectively arranged on the driven shaft (19), the first oil channel hose (33) is communicated with the oil tank (12) and the directional valve (14), the oil tank (12) is communicated with the third opening (43), and the second oil channel hose (15) is communicated with the directional valve (14) and the first opening (41), the pressure sensor (18) is arranged in the second opening (42), the signal amplifier (16) is electrically connected between the pressure sensor (18) and the signal control unit (45), and the signal control unit (45) is also connected with the directional valve (14).

2. A hydro-viscous speed-governing clutch (200), comprising:

the transmission device comprises a driven disk (10) and a driven shaft (19), wherein the driven disk (10) is arranged on the driven shaft (19);

the control device is positioned in the transmission device and comprises a piston (11), a spring (13) and a spring top plate (26), the piston (11) is arranged on the driven shaft (19) and positioned in the driven plate (10), a working oil cavity (28) is formed between the piston (11) and the driven plate (10), the spring top plate (26) is arranged on the driven shaft (19) and positioned in the piston (11), the spring (13) is connected with the piston (11) and the spring top plate (26), an accommodating space (40) is formed between the piston (11) and the spring top plate (26), a first opening (41) and a second opening (42) are formed in the piston (11), and a third opening (43) is formed in the spring top plate (26); and

the automatic oil supplementing device is arranged on the driven shaft (19) and located in the accommodating space (40), the automatic oil supplementing device comprises a directional valve (14), a first oil channel hose (33), a second oil channel hose (15), a signal amplifier (16), a pressure sensor (18) and a signal control unit (45), the directional valve (14), the signal amplifier (16) and the signal control unit (45) are respectively arranged on the driven shaft (19), the first oil channel hose (33) is communicated with the directional valve (14) and the third opening (43), the second oil channel hose (15) is communicated with the directional valve (14) and the first opening (41), the pressure sensor (18) is arranged in the second opening (42), and the signal amplifier (16) is electrically connected between the pressure sensor (18) and the signal control unit (45), the signal control unit (45) is also connected with the directional valve (14).

3. The hydroviscous clutch (200) according to claim 2, wherein the driven plate (10) is provided with a damping hole (29), and the damping hole (29) communicates with the working oil chamber (28).

4. The hydroviscous speed-regulating clutch (200) according to claim 3, wherein the hydroviscous speed-regulating clutch (200) further comprises a driven shaft through cover (20) sleeved on the driven shaft (19), and the driven shaft through cover (20) is provided with a first radial oil passage (20 a); the driven shaft (19) is provided with a second radial oil passage (19a), a first axial oil passage (19b) and a third radial oil passage (19c), the first radial oil passage (20a) is connected with the second radial oil passage (19a), two ends of the first axial oil passage (19b) are respectively connected with the second radial oil passage (19a) and the third radial oil passage (19c), and the third radial oil passage (19c) is connected with the working oil chamber (28).

5. The hydroviscous speed-regulating clutch (200) according to claim 2, wherein the transmission further comprises a driving shaft (1), a supporting disc (5), driving friction plates (6), driven friction plates (7) and a driven drum (8), the driving friction plates (6) being arranged on the driving shaft (1), the driven friction plates (7) being arranged on the driven drum (8), the driven drum (8) connecting the driven disc (10) and the supporting disc (5).

6. The hydroviscous speed-adjusting clutch (200) according to claim 5, wherein the hydroviscous speed-adjusting clutch (200) further comprises a driveshaft transmission cover (27) provided on the driveshaft (1), a fourth radial oil passage (27a) on the driveshaft transmission cover (27); the oil distribution structure is characterized in that a fifth radial oil duct (1a), a second axial oil duct (1b), a sixth radial oil duct (1c) and a branch oil duct (1d) are arranged on the driving shaft (1), the fourth radial oil duct (27a) is connected with the fifth radial oil duct (1a), two ends of the second axial oil duct (1b) are respectively connected with the fifth radial oil duct (1a) and the sixth radial oil duct (1c), and the branch oil duct (1d) is connected with the sixth radial oil duct (1c) and the third opening (43).

7. The hydro-viscous speed-adjusting clutch (200) according to claim 6, characterized in that the hydro-viscous speed-adjusting clutch (200) further comprises an oil passage disc (24), the oil passage disc (24) is disposed between the sprung disc (26) and the driveshaft (1), and a seventh radial oil passage (30) is formed between the oil passage disc (24) and the driveshaft (1), the seventh radial oil passage (30) being connected between the branch oil passage (1d) and the third opening (43).

8. The hydro-viscous speed-regulating clutch (200) according to claim 2, characterized in that the signal control unit (45) comprises a microprocessor (451), an analog-to-digital converter (452) and a digital-to-analog converter (453), the microprocessor (451) being connected between the analog-to-digital converter (452) and the digital-to-analog converter (453), the analog-to-digital converter (452) being connected to the signal amplifier (16), the digital-to-analog converter (453) being connected to the directional valve (14).

9. The hydro-viscous speed-governing clutch (200) of claim 2, wherein the directional valve (14) is a solenoid directional valve.

10. The hydro-viscous speed-adjusting clutch (200) according to claim 2, wherein the automatic oil-replenishing device further includes an oil tank (12), the oil tank (12) is provided on the driven shaft (19) and connected to the spring top disc (26), and the first oil-passage hose (33) is connected to the third opening (43) through the oil tank (12).