CN108036042B - Gearbox with magnetorheological gear shifting device and use method - Google Patents

Abstract

The invention relates to a gearbox with a magnetic current shifting gear device, comprising a first shaft of the gearbox, an intermediate shaft of the gearbox and a magnetic current shifting device. The gears on the intermediate shaft of the case are engaged with each other, the first shaft of the gearbox provides power for the magnetic current shifting device, and the magnetic current shifting device is engaged with the intermediate shaft through the gears. At the same time, the present invention also provides a method for using a gearbox with a magnetic current shifting device. The invention applies the magnetorheological fluid to the gear shifting device of the transmission, and uses the magnetorheological fluid to have the basic advantage and characteristic of being highly sensitive to signals, thereby achieving high efficiency and accurate control of changing power transmission or interruption; at the same time, the gear of the present invention is The design of the structure can maximize the transmission torque between the two in the same space, making the transmission torque easier and more convenient.

Description

A kind of gearbox with magnetic current shifting gear device and using method

technical field

The invention relates to the technical field of automobile gearboxes, in particular to a gearbox with a magnetic current shifting device and a method of using the same.

Background technique

The electronically controlled mechanical automatic transmission AMT is a typical representative of the gearbox. The gear ratio is changed by changing different transmission lines to achieve the purpose of shifting. When shifting, the peripheral speeds of a pair of meshing gear teeth in the selected gear are equal. , without the impact between the gear teeth or spline teeth, it is necessary to use a synchronizer to make the peripheral speed of the combined sleeve and the corresponding combined ring gear quickly reach and keep the same. However, the long shifting time of AMT gearbox and the power interruption phenomenon that will occur during the shifting process lead to the disadvantage of poor shifting quality. If the shifting force is increased, the synchronizing time can be reduced, but excessive shifting force may damage the synchronizing cone oil film on the synchronizer, generate a large amount of heat instantaneously, and lead to possible ablation of the synchronizer. Moreover, due to the large speed difference between the engine and the input shaft of the transmission, an excessively large shifting force in a moment will cause the shifting speed to be too large, resulting in tooth beating and shifting shock, resulting in a high damage rate of the synchronizer, more than 70% of the time. Transmission repair is damage to the synchronizer caused by improper operation by the driver. Therefore, over the years, the research topics of how to change this situation and how to improve the shifting quality have been widely concerned.

SUMMARY OF THE INVENTION

In view of the above analysis, the present invention aims to provide a gearbox with a magnetic current shifting device and a method for using it, so as to solve the problem of power interruption in the existing gearbox due to excessively long shifting time during the shifting process, And lead to the problem of poor shifting quality.

The object of the present invention is mainly achieved through the following technical solutions:

A gearbox with a magnetic current shifting device, comprising a first shaft of the gearbox, a gearbox intermediate shaft and a magnetic current shifting device, the gears on the first shaft of the gearbox are connected to the intermediate shaft of the gearbox The gears on the upper gears are engaged, and the first shaft of the gearbox provides power for the magnetic current shifting device, and the magnetic current shifting device is engaged with the intermediate shaft through the gears.

The beneficial effects of the present invention are as follows: the present invention installs the magnetic flow shifting device in the gearbox, and can realize the power between the power input end and the power output end in the gearbox through the magnetorheological fluid in the magnetic flow shifting device Pass and interrupt, play the role of synchronizer.

On the basis of the above scheme, the present invention has also made the following improvements:

Further, the magnetic current shifting gear device includes a power input end gear and a power output shaft, the power input end gear is installed outside the power output shaft; the power input end gear and the power output shaft are formed between The cavity is filled with magnetorheological fluid, and the excitation coil is located on one side of the gear at the power input end.

The invention controls the power transmission or interruption of the shifting device by adjusting the current of the excitation coil to change the magnitude of the transmission torque, thereby changing the strength and shape of the shear yield stress of the magnetorheological fluid, and the gearbox changes different transmission routes. To change the transmission gear ratio to achieve the purpose of shifting.

Further, the inner ring of the gear at the power input end is an inner ring gear structure, and the outer ring of the power output shaft is an outer ring gear structure; the inner ring gear of the power input end gear and the outer gear of the power output shaft The ring is meshed and separated through magnetorheological fluid; the gear at the power input end meshes with the intermediate shaft.

The invention processes the inner ring of the power input end gear and the outer ring of the power output shaft into a ring gear structure, which can maximize the transmission torque between the two in the same space, making the transmission torque more simple and convenient; the invention The cavity between the inner ring gear structure and the outer ring gear structure is filled with magnetorheological fluid to realize the speed change of the gearbox.

Further, the power input gear is a shaft body concentric with the power output shaft.

Further, the magnetic flow shifting gear device further includes a sealing device, and the sealing device is fixed between the power input end gear and the power output shaft to seal the cavity.

Further, the sealing device is two lip-shaped sealing rings, which are respectively located on both sides of the cavity.

In the present invention, a sealing device is arranged between the power input end gear and the power output shaft, which can prevent the leakage of the magnetorheological fluid.

Further, the magnetic current shifting device further includes an end cover, the end cover is a stepped disc structure with a hole in the middle, and the excitation coil is fixed on the power input gear, the end cover and the power output shaft. in the enclosed space.

In the present invention, the end cover is designed as a stepped disc structure with a hole in the middle, and the hole in the middle is for passing the shaft member, that is, the power output end.

Further, the end cap includes a front end of the end cap, a middle part of the end cap and a rear end of the end cap, and the front end of the end cap, the middle part of the end cap and the rear end of the end cap are one-piece structures, and the outer diameters decrease sequentially.

The rear end of the stepped end cover of the present invention is to increase the outer edge area to make the fixation with the power input end gear more stable, the front end of the end cover is to facilitate contact with the outer edge of the bearing, and the middle of the end cover is to increase the distance between the end cover and the bearing. The cavity space between the PTO shafts increases the number of coils that can be wound around.

Further, the excitation coil is fixed in the space enclosed by the power input end gear, the end cover and the power output shaft.

Further, a bearing is provided between the front end of the end cover and the power output shaft, and the outer edge of the rear end of the end cover is fixedly connected with the power input end gear.

Preferably, the outer edge of the rear end of the end cover and the gear at the power input end are fixedly connected by hexagonal bolts.

A method of using a gearbox with a magnetic current shifting gear device, comprising the following steps:

Step 1. The engine drives the first shaft of the gearbox to rotate through the clutch input power, the gear on the first shaft of the gearbox drives the intermediate shaft of the gearbox and the gears on it to rotate, and the gear on the magnetic current shifting device rotates. gear idling;

Step 2. When gear selection is required, a current is applied to the excitation coil to change the state of the magnetorheological fluid in the magnetorheological shifting device. The gear is combined with the power output shaft to output power, and the initial gear is obtained at this time;

Step 3. When gear shifting is required, the current in the excitation coil of the initial gear is disconnected, the power input gear in the initial gear is separated from the power output shaft, and current is applied to the excitation coil that needs a working gear to realize gear shifting. .

The beneficial effects of the present invention are:

(1) The present invention applies the magnetorheological fluid to the gear shifting device of the transmission, and uses the magnetorheological fluid to have the basic advantages and characteristics of being highly sensitive to signals, thereby achieving high efficiency and accurate control of changing power transmission or interruption;

(2) The present invention only needs to adjust the coil current to change the magnitude of the magnetic induction intensity, and then realize the influence on the shear yield stress of the magnetorheological fluid, which can control the power transmission or not, and then replace the traditional pure synchronization The gearbox can realize gear shifting, and the gearbox with magnetic current shifting device can realize no wear and quick response;

(3) The design of the gear-like structure of the present invention can maximize the transmission torque between the two in the same space, making the transmission torque more simple and convenient;

(4) In the present invention, after the excitation coil is energized, the magnetorheological fluid in the cavity can have a magnetorheological effect, so that the transmission torque between the transmission shafts can be transmitted, and the engagement of the shifting device can be changed by adjusting the excitation coil current. or not;

(5) The present invention applies the magnetorheological fluid to the design of the automobile gearbox, utilizes the characteristics of the magnetorheological fluid to respond sensitively and quickly to the input signal, and replaces the traditional synchronizer synchronization by transmitting the transmission torque through the magnetorheological fluid Shifts are implemented to improve the performance of the transmission.

In the present invention, the above technical solutions can also be combined with each other to achieve more preferred combination solutions. Additional features and advantages of the invention will be set forth in the description which follows, and some of the advantages may become apparent from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention may be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.

Description of drawings

The drawings are for the purpose of illustrating specific embodiments only and are not to be considered limiting of the invention, and like reference numerals refer to like parts throughout the drawings.

1 is a schematic diagram of the entire gearbox with a magnetic current shifting device;

FIG. 2 is a schematic structural diagram of a magnetic current shifting device.

In the figure, 101- first shaft of gearbox, 102- intermediate shaft of gearbox, 103- gear, 104- power take-off shaft, 105- end cover, 106- hexagon bolt, 107- bearing, 108- lip seal, 201 - Cavity, 202 - Excitation coil.

Detailed ways

The preferred embodiments of the present invention are specifically described below with reference to the accompanying drawings, wherein the accompanying drawings constitute a part of the present application, and together with the embodiments of the present invention, are used to explain the principles of the present invention, but are not used to limit the scope of the present invention.

The invention is based on the phenomenon of high damage rate of the synchronizer in the gearbox, and applies the magnetorheological fluid to the gear shifting device of the transmission. The magnetorheological fluid has the basic advantages and characteristics of being highly sensitive to signals, thereby achieving the change of power transmission or Efficient and accurate control of interruptions. Under normal circumstances, it is only necessary to adjust the size of the coil current to change the magnitude of the magnetic induction intensity, and then realize the influence on the shear yield stress of the magnetorheological fluid, which can control the power transmission or not, which replaces the traditional pure synchronization The transmission can realize gear shifting with the magnetic flow shifting device, which can realize no wear and quick response. The design of the gear-like structure can maximize the transmission torque between the two in the same space, making the transmission torque easier and more convenient.

A specific embodiment of the present invention discloses a gearbox with a magnetic current shifting device, as shown in FIG. 1 , including a gearbox first shaft 101 , a gearbox intermediate shaft 102 and a magnetic current shifting device , there are gears on the first shaft 101 of the gearbox, and there are multiple gears on the intermediate shaft 102 of the gearbox. The other gears are meshed with the gear 103 on the magnetic current shifting device; the power of the magnetic current shifting device is transmitted from the first shaft 101 of the gearbox.

The structure of the magnetic current shifting device is shown in FIG. 2 , wherein FIG. 2 is an enlarged view of the circled part in FIG. 1 . The magnetic current shifting device includes a gear 103 , a power output shaft 104 , an end cover 105 , and a hexagonal bolt 106 , bearing 107, lip seal 108, cavity 201 and excitation coil 202, gear 103 is fixed on PTO shaft 104, end cover 105 is fixed with gear 103 through hexagonal bolt 106, between PTO shaft 104 and end cover 105 A bearing 107 is provided, a cavity 201 is provided between the gear 103 and the power output shaft 104, an excitation coil 202 is provided on one side of the gear 103, and a lip seal 108 is provided between the gear 103 and the power output shaft 104; Note that the power output shaft 104 here is the second shaft of the gearbox;

The inner ring of the gear 103 is processed into an inner ring gear structure through a process, the outer ring of the power output shaft 104 is processed into an outer ring gear structure, and the inner ring gear structure of the gear 103 and the outer ring gear structure of the power output shaft 104 are not meshed; There is a gap between the inner ring gear structure of the gear 103 and the outer ring gear structure of the power output shaft 104, the gap forms a cavity 201, and the present invention fills the cavity 201 with magnetorheological liquid; the gear 103 is connected to the power output shaft 104 It is a concentric shaft body; it is worth noting that the magnetorheological fluid in this embodiment can be installed with a seal at one end first, and then directly inject the magnetorheological fluid into the cavity, and then fill the seal at the other end;

The end cap 105 is a disc-shaped structure with a hole in the middle. In this embodiment, the end cap 105 is a stepped disc-shaped structure, including the front end of the end cap, the middle part of the end cap and the rear end of the end cap, the rear end of the end cap, the end cap The diameter of the outer edge of the middle part and the front end of the end cap decreases in turn, and the apertures of the rear end of the end cap, the middle part of the end cap and the front end of the end cap decrease in turn; A bearing 107 is arranged between the front end and the power output shaft 104, so that the power output shaft 104 can rotate relative to the end cover 105; it is worth noting that when the rear end of the end cover is fixed on the gear 103 in this embodiment, it is not limited to use The hexagonal bolts 106 can be used as long as the end cover 105 and the gear 103 can be fixed; the shaft diameter of the power output shaft 104 at the fixed bearing 107 is smaller than the shaft diameter of the power output shaft 104 at the fixed gear 103. The difference in shaft diameter is to facilitate the axial positioning when installing the bearing. It can be installed directly from the end with the small shaft diameter. The large shaft diameter can play the role of clamping the bearing; the front end of the end cover is directly in contact with the bearing, and the function of the bearing It can make the objects at both ends rotate at different speeds. The upper end of the bearing is in contact with the front end of the end cover, and the lower end of the bearing is in contact with the power output shaft, so that the end cover and the bearing can rotate at different circumferential speeds.

The lip seal 108 is arranged between the gear 103 and the power output shaft 104, that is to say, the lip seal 108 seals the cavity 201 formed between the gear 103 and the power output shaft 104 to prevent magnetorheological changes in the cavity fluid leakage.

The excitation coil 202 is fixed on one side of the gear 103. In this embodiment, the excitation coil 202 is fixed in the space enclosed by the gear 103, the end cover 105, and the power output shaft 104; when the excitation coil 202 is energized, the The magnetorheological fluid begins to form a chain-like structure. At this time, the magnetorheological fluid exists in the form of solid. When the input mechanism rotates, the magnetorheological fluid in the solid form is affected by the inner ring gear structure of the gear 103 and the outer ring gear structure of the power output shaft 104. Due to the limitation of the shape, a gear-like structure is formed, which meshes with the inner ring gear of the gear 103 and the outer ring gear of the power output shaft 104 to transmit the transmission power; when the excitation coil 202 is in a power-off state, there is no magnetic field in the cavity 201, and the magnetorheological The liquid is in the state of Newtonian fluid and flows freely in the cavity. There is only the viscous torque of the liquid between the gear 103 and the power take-off shaft 104, which can be ignored due to the small value; this embodiment connects the coil in the cavity to the external space , change the on-off of the current in the excitation coil through the switch.

It is worth noting that the magnetic current shifting device in the present invention can be applied to all gears in the second shaft of the gearbox and the second shaft of the gearbox, but the application range of the magnetic current shifting device in the present invention is not limited to Limited to this, as long as the device of the present invention can be used to achieve shifting or other applications are applicable.

Another specific embodiment of the present invention discloses a method for using a gearbox with a magnetic current shifting gear device, comprising:

Step 1. The engine drives the first shaft of the gearbox to rotate through the clutch input power, and the gear on the first shaft of the gearbox drives the intermediate shaft of the gearbox and the gears on it to rotate, and the gear on the second shaft of the gearbox is connected to the intermediate shaft of the gearbox. The upper gear meshes and rotates idly on the second shaft of the gearbox, so the second shaft of the gearbox cannot be driven in this state; it is worth noting that the second shaft of the gearbox here is the same shaft as the power output shaft;

Step 2. The gear of the second shaft of the gearbox and the second shaft of the gearbox are in an idling state. When gear selection is required, a current is applied to the excitation coil to change the state of the magnetorheological fluid. The change of the state of the magnetorheological fluid makes the speed change. The second shaft gear of the gearbox is combined with the second shaft of the gearbox and outputs power. At this time, it is in the initial gear; it is worth noting that the second shaft gear of the gearbox is the power input gear at this time.

Step 3. When shifting is required, the current in the excitation coil of the initial gear is disconnected, and current is applied to the excitation coil of the gear that needs to be operated to realize shifting.

To sum up, the present invention provides a gearbox with a magnetorheological shifting device and a method of using the same. The present invention transmits the transmission torque through magnetorheological fluid to realize the transmission between the power input gear and the power output shaft in the gearbox. The power transmission and interruption play the role of a synchronizer; at the same time, the invention designs the inner ring of the power input end gear and the outer ring of the power output shaft into a gear-like structure, which can realize the phase between the magnetorheological fluid and the gear and the power output shaft. Engage self-locking to transmit transmission power, and then achieve the purpose of shifting.

The above description is only a preferred embodiment of the present invention, but the protection scope of the present invention is not limited to this. Substitutions should be covered within the protection scope of the present invention.

Claims (1)

1. The use method of the gearbox with the magneto-rheological gear shifting device is characterized in that the gearbox with the magneto-rheological gear shifting device comprises a first gearbox shaft, a middle gearbox shaft and the magneto-rheological gear shifting device, a gear on the first gearbox shaft is meshed with a gear on the middle gearbox shaft, the first gearbox shaft provides power for the magneto-rheological gear shifting device, and the magneto-rheological gear shifting device is meshed with the middle gearbox shaft through the gear;

the magnetorheological gear shifting device comprises a power input end gear and a power output shaft, and the power input end gear is arranged outside the power output shaft; a cavity is formed between the power input end gear and the power output shaft, magnetorheological fluid is filled in the cavity, and the excitation coil is positioned on one side of the power input end gear;

the inner ring of the power input end gear is of an inner gear ring structure, and the outer ring of the power output shaft is of an outer gear ring structure; the inner gear ring of the power input end gear is meshed and separated with the outer gear ring of the power output shaft through magnetorheological fluid; the power input end gear is meshed with the intermediate shaft of the gearbox;

the power input end gear is a shaft body concentric with the power output shaft;

the magnetorheological gear shifting device further comprises a sealing device, and the sealing device is fixed between the power input end gear and the power output shaft and seals the cavity;

the sealing device is two lip-shaped sealing rings which are respectively positioned at two sides of the cavity;

the magnetorheological gear shifting device further comprises an end cover, wherein the end cover is of a stepped disc structure with a hole in the middle, the end cover comprises an end cover front end, an end cover middle part and an end cover rear end, the outer edge diameters of the end cover rear end, the end cover middle part and the end cover front end are sequentially reduced, and the hole diameters of the end cover rear end, the end cover middle part and the end cover front end are sequentially reduced; the excitation coil is fixed in a space surrounded by the power input end gear, the end cover and the power output shaft;

a bearing is arranged between the front end of the end cover and the power output shaft;

the outer edge of the rear end of the end cover is fixed with the power input end gear through a bolt;

the method comprises the following steps:

step 1, an engine inputs power through a clutch to drive a first shaft of a gearbox to rotate, a gear on the first shaft of the gearbox drives a middle shaft of the gearbox and gears on the middle shaft of the gearbox to rotate, and gears on a magnetorheological gear shifting device idle;

step 2, when gear selection is needed, applying current to the excitation coil to change the state of magnetorheological fluid in the magnetorheological gear shifting device, and enabling a power input end gear and a power output shaft in the magnetorheological gear shifting device to be combined and output power through the change of the state of the magnetorheological fluid, so that an initial gear is obtained; the magnetorheological fluid exists in a solid state, and when the input mechanism rotates, the magnetorheological fluid in the solid state is limited by the shapes of the inner gear ring structure of the power input end gear and the outer gear ring structure of the power output shaft to form a gear-shaped structure which is meshed with the inner gear ring of the power input end gear and the outer gear ring of the power output shaft to transmit transmission power;

and 3, when gear shifting is needed, disconnecting the current in the excitation coil of the initial gear, separating the gear at the power input end in the initial gear from the power output shaft, and applying the current to the excitation coil of the gear needing to be operated to realize the gear shifting.

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