A real-time torque differential

Abstract

The present invention relates to the technical field of automobile differentials, and specifically to a real-time torque differential, comprising two sets of differential devices, wherein the differential devices are arranged on both sides of a driving wheel, and the differential device comprises a driving wheel, a differential wheel device, a speed limiting wheel device and a driving shaft, wherein the driving wheel is provided with a plurality of sliding holes evenly distributed along the axis, the driving wheel is fixedly connected with a plurality of driving rods, and the driving rods are connected to the differential wheel device; the speed limiting wheel device is arranged between the driving wheel and the differential wheel device, one side of the speed limiting wheel device is connected to the sliding hole, and the other side is connected to the differential wheel device; the driving shaft is connected to the differential wheel device and the speed limiting wheel device; the present invention utilizes the speed limiting wheel device to skillfully lock the speed ratio range of the left and right wheels, thereby achieving the purpose of limiting the speed ratio of the wheels on both sides.

Description

Technical Field

[0001] The invention relates to the technical field of automobile differentials, in particular to a real-time torque differential. Background Art

[0002] The car differential is a mechanism that enables the left and right (or front and rear) drive wheels to rotate at different speeds. It is mainly composed of left and right half-shaft gears, two planetary gears and a gear rack. The function is to make the left and right wheels roll at different speeds when the car is turning or driving on uneven roads, that is, to ensure that the drive wheels on both sides perform pure rolling motion. The differential is installed to adjust the speed difference between the left and right wheels. However, the differential has disadvantages. Since the differential allows the wheels on both sides to rotate at different speeds, when one side of the vehicle's drive wheels slips, or one side of the wheel leaves the ground due to intense driving, due to the equal torque effect of the differential, all the power will be transmitted to the slipping half-shaft, causing the wheel on the slipping side to rotate rapidly, while the wheel on the other side loses driving force, which will put the vehicle in trouble and lose controllability. Therefore, a limited slip differential appeared;

[0003] Limited Slip Differential (LSD), as the name implies, is an improved differential that limits wheel slippage, and refers to a type of differential in which the speed difference of the driving wheels on both sides is allowed to be within a certain range to ensure normal driving performance such as turning. Limited slip differential can better solve the shortcomings of ordinary differentials. When one side of the wheel slips, the speed of the slipping wheel is limited, and the speed of the non-slipping wheel on the other side is increased, so that the car can continue to maintain power.

[0004] Chinese invention patent CN201810157064.0 discloses a limited slip differential, including a differential case, a power input device is provided on the differential case, two ends of the differential case are respectively rotatably mounted with half shafts along the axial direction, and the ends of the two half shafts extending into the differential case are respectively fixed with half shaft gears; a differential transmission device corresponding to the two half shaft gears is provided in the differential case, an inner limited sliding sleeve is fixedly provided on at least one of the half shafts and located outside the half shaft gear, an outer limited sliding sleeve is fixedly provided on the differential case, an annular limited slip space is formed between the inner limited sliding sleeve and the outer limited sliding sleeve, a limited slip end cover is sealed at the port of the annular limited slip space, the limited slip end cover is slidably connected with the inner limited sliding sleeve or the outer limited sliding sleeve, and the annular limited slip space is filled with a high-viscosity liquid; a plurality of limited slip inner ring plates are provided on the outer circumferential surface of the inner limited sliding sleeve, and a plurality of limited slip outer ring plates are provided on the inner circumferential surface of the outer limited sliding sleeve. The limited slip differential of this invention utilizes the friction between the outer limited slip sleeve, the inner limited slip sleeve and the high viscosity liquid to prevent the slipping side wheel from increasing its speed, thereby reducing the speed difference between the half shaft and the differential housing. However, this method causes a large amount of power to be consumed by friction, resulting in a large waste of energy and a large amount of frictional heat generation. Summary of the invention

[0005] In order to solve the above problems, the present invention provides a real-time torque differential.

[0006] The technical solution adopted by the present invention to solve the technical problem is: a real-time torque differential, including two sets of differential devices, the differential devices are arranged on both sides of the driving wheel, the differential device includes a driving wheel, a differential wheel device, a speed limiting wheel device and a driving shaft, the driving wheel is provided with a plurality of mounting grooves evenly distributed along the axis, the driving wheel is fixedly connected to a plurality of driving rods, and the driving rods are connected to the differential wheel device;

[0007] The speed limiting wheel device is arranged between the driving wheel and the differential wheel device, one side of the speed limiting wheel device is connected to the mounting groove, and the other side is connected to the differential wheel device;

[0008] The two speed limiting wheel devices at corresponding positions on the two sets of differential devices are installed in the same installation groove, and the two speed limiting wheel devices are connected by gear meshing;

[0009] The driving shaft is connected to the differential wheel device and the speed limiting wheel device.

[0010] As an optimization, the speed limiting wheel device includes a first speed limiting gear, a speed limiting gear rod and a second speed limiting gear arranged on the driving shaft;

[0011] The first speed limiting gear is arranged on the differential wheel device;

[0012] The speed limiting gear rod comprises a constant speed gear, a reduction gear and an intermediate gear, the constant speed gear is coaxially fixedly connected with the reduction gear, a rotating shaft is provided on one side of the constant speed gear, the intermediate gear is provided on the rotating shaft, and the rotating shaft is rotatably installed in the installation groove;

[0013] The constant speed gear is meshed with the second speed limiting gear, and the reduction gear is meshed with the first speed limiting gear.

[0014] As an optimization, the mounting groove includes two sliding holes, a gear groove is connected between the two sliding holes, and the two speed limiting gear rods at corresponding positions on the two sets of differential devices are respectively installed in the two sliding holes through a rotating shaft, and are meshed and connected through an intermediate gear, and the intermediate gear is arranged in the gear groove.

[0015] As an optimization, the differential gear device includes a first bevel gear, a second bevel gear and a planetary gear, the first bevel gear is coaxially fixedly connected to the drive shaft, the first speed limiting gear is coaxially fixed to the second bevel gear, the planetary gear is meshed with the first bevel gear and the second bevel gear, and the planetary gear is rotatably connected to the drive rod.

[0016] As an optimization, the first speed limiting gear is an internal gear.

[0017] As an optimization, the driving shaft passes through the second bevel gear and is connected to the speed limiting gear rod.

[0018] As an optimization, the differential device is provided with a shell outside, the shell is fixed on the driving wheel, the driving rod is fixed on the shell, and the driving rod is fixedly connected to the driving wheel through the shell.

[0019] As an optimization, the pitch circle diameter of the constant speed gear is larger than the pitch circle diameter of the reduction gear, and the speed limiting gear rod is used to transmit differential torque to the drive shaft to limit the speed ratio of the left and right wheels of the vehicle.

[0020] As an optimization, the number of the installation slots is 2 to 4, and the number of speed limiting wheel devices correspondingly installed in the installation slots is 2 to 4 on the same differential device.

[0021] As an optimization, the rotating shaft is installed in the sliding hole through a bearing bush.

[0022] The beneficial effect of this solution is that the real-time torque differential of the present invention can decelerate the slipping wheel without a friction obstruction structure to ensure safe driving. When the speed of the driving wheel is fixed, the wheels on the left and right sides have upper and lower limits, thereby forming a speed ratio range. The speed ratio range provided by the present invention ensures that when the wheel slips, the speed will not rise indefinitely, and the non-slip side will not stop, so that the non-slip side wheel can continue to move forward. The present invention is different from a conventional limited slip differential. The speed of one side wheel is used to limit the speed of the other side wheel, and a speed ratio range can be achieved between the two wheels, so that power can be transmitted to the non-slip side without a differential lock, so that the vehicle can drive normally. The real-time torque differential of the present invention has reasonable power distribution, does not generate a lot of heat due to friction, and reduces energy waste, and is very suitable for installation and use in various vehicles. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Attached Figure 1 It is a schematic diagram of the transmission principle of the present invention.

[0024] Attached Figure 2 It is an axial schematic diagram of the internal structure of the present invention.

[0025] Attached Figure 3 It is a schematic diagram of the axial direction of the present invention.

[0026] Attached Figure 4 It is a schematic diagram of the present invention from the left side.

[0027] Attached Figure 5 This is a schematic diagram of the speed limiting gear rod structure of the present invention.

[0028] Attached Figure 6 This is a schematic diagram of the driving wheel of Example 1 of the present invention.

[0029] Attached Figure 7 The present invention is attached Figure 6 Side view of the driving wheel.

[0030] Attached Figure 8 The present invention is attached Figure 7 AA cross-section diagram of .

[0031] Attached Fig. 9 The present invention is attached Figure 7 Schematic diagram of the BB cross section.

[0032] Attached Fig.10 This is a schematic diagram of the driving wheel of Example 2 of the present invention.

[0033] Attached Fig.11 It is a schematic diagram of the drive shaft structure of the present invention.

[0034] Attached Fig.12 It is a schematic diagram of a differential device on one side of the present invention.

[0035] Attached Fig.13 The present invention is attached Fig.12 The enlarged schematic diagram at point A in the middle shows the connection method of the speed limiting gear rod.

[0036] Among them, 1. differential device, 2. driving wheel, 3. differential wheel device, 4. speed limiting wheel device, 5. driving shaft, 6. sliding hole, 7. driving rod, 8. first speed limiting gear, 9. speed limiting gear rod, 10. second speed limiting gear, 11. constant speed gear, 12. reduction gear, 13. rotating shaft, 14. first bevel gear, 15. second bevel gear, 16. planetary gear, 17. housing, 18. mounting groove, 19. gear groove, 20. intermediate gear. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. The components of the embodiments of the present invention generally described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0038] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0039] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the product of the invention is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0040] Example 1

[0041] like Figure 1As shown, a real-time torque differential comprises two sets of differential devices 1, wherein the differential devices 1 are arranged on both sides of a driving wheel 2, and the outer circumference of the driving wheel 2 is provided with driving teeth (not shown in the figure) connected to the engine, and the driving teeth are straight teeth or helical teeth, and the differential device 1 comprises a driving wheel 2, a differential wheel device 3, a speed limiting wheel device 4 and a driving shaft 5, and the driving wheel 2 is provided with two mounting grooves 18 evenly distributed along the axis, and the driving wheel 2 is fixedly connected with a plurality of driving rods 7, and the driving rods 7 are connected to the differential wheel device 3;

[0042] like Figure 2 As shown, the speed limiting wheel device 4 is arranged between the driving wheel 2 and the differential wheel device 3, one side of the speed limiting wheel device 4 is connected to the mounting groove 18, and the other side is connected to the differential wheel device 3;

[0043] The two speed limiting wheel devices 4 at corresponding positions on the two sets of differential devices 1 are installed in the same installation groove 18, and the two speed limiting wheel devices 4 are connected by gear meshing;

[0044] like Figure 2 As shown, the driving shaft 5 is connected to the differential wheel device and the speed limiting wheel device 4, and the other end of the driving shaft is externally connected to the vehicle wheel.

[0045] like Figure 1 As shown in FIG. 2 , the speed limiting wheel device 4 includes a first speed limiting gear 8, a speed limiting gear rod 9 and a second speed limiting gear 10 provided on the driving shaft 5;

[0046] like Figure 2 or Fig.13 As shown, the first speed limiting gear 8 is arranged on the differential gear device 3;

[0047] like Figure 1 or Figure 5 As shown, the speed limiting gear rod 9 includes a constant speed gear 11, a reduction gear 12 and an intermediate gear 20. The constant speed gear 11 is coaxially fixedly connected with the reduction gear 12. A rotating shaft 13 is provided on one side of the constant speed gear 11. The intermediate gear 20 is provided on the rotating shaft. The rotating shaft 13 is rotatably installed in the mounting groove 18.

[0048] The speed limiting gear rod 9 is composed of gear columns of different diameters and is a key component for achieving the purpose of limited slip in the present invention. By adjusting the pitch circle diameter ratio of the constant speed gear and the reduction gear, the speed ratio range between the wheels on both sides can be adjusted. The specific calculation method is not within the scope of the present invention.

[0049] like Figure 1 or Fig.13 As shown, the constant speed gear 11 is meshed with the second speed limiting gear 10 , and the reduction gear 12 is meshed with the first speed limiting gear 8 .

[0050] The mounting groove 18 includes two sliding holes 6, and a gear groove 19 is connected between the two sliding holes 6. The two speed limiting gear rods 9 at corresponding positions on the two sets of differential devices 1 are respectively installed in the two sliding holes 6 through the rotating shaft 13, and are meshed and connected through the intermediate gear 20, and the intermediate gear 20 is arranged in the gear groove 19. The intermediate gear 20 is used to realize the differential device 1 connecting the two sides of the driving wheel 2, and realize the interaction between the wheels on both sides, mainly for the mutual restriction of the speed ratio.

[0051] like Figure 1 As shown in or 2, the differential gear device 3 includes a first bevel gear 14, a second bevel gear 15 and a planetary gear 16, the first bevel gear 14 is coaxially fixedly connected to the drive shaft 5, the first speed limiting gear 8 is coaxially fixedly connected to the second bevel gear 15, the planetary gear 16 is meshed with the first bevel gear 14 and the second bevel gear 15, and the planetary gear 16 is rotatably connected to the drive rod 7.

[0052] There are 2 to 3 planetary gears, and 2 to 3 corresponding driving rods are provided.

[0053] In order to achieve the rotation of the reduction gear 12 and the second bevel gear 15 in the same direction, the first speed limiting gear 8 is an internal gear.

[0054] The driving shaft 5 passes through the second bevel gear 15 and is connected to the speed limiting gear rod 9 .

[0055] like Figure 2 or Figure 3 As shown, the differential device 1 is provided with a housing 17 , the housing 17 is fixed on the driving wheel 2 , the driving rod 7 is fixed on the housing 17 , and the driving rod 7 is fixedly connected to the driving wheel 2 through the housing 17 .

[0056] In order to fix the speed ratio of the left and right wheels of the vehicle within a certain range, the pitch circle diameter of the constant speed gear 11 is larger than the pitch circle diameter of the reduction gear 12, and the speed limiting gear rod 9 is used to transmit differential torque to the drive shaft 5. The speed ratio of the left and right wheels of the vehicle is limited by gear transmission with different numbers of teeth.

[0057] There are two installation grooves 18 , and two corresponding speed limiting wheel devices 4 are installed in the installation grooves 18 on the same differential device 1 , three corresponding planetary gears 16 are provided, and three speed limiting gear rods 9 are provided.

[0058] The driving rod 7 is a rigid rod, which is used for the driving wheel 2 to provide rotational force to the driving shaft 5.

[0059] In order to realize that the speed limiting gear rod 9 can rotate on its own and rotate with the driving wheel 2, the rotating shaft 13 is installed in the sliding hole through the bearing bush.

[0060] Example 2

[0061] The difference of this embodiment is that the driving wheel 2 is provided with three mounting grooves, three corresponding speed limiting wheel devices 4 are provided in the mounting grooves 18, three corresponding planetary gears 16 are provided, and three speed limiting gear rods 9 are provided. The remaining features are the same as those of the embodiment 1 and will not be repeated.

[0062] Principle of the invention:

[0063] When the vehicle is running normally, the driving wheel 2 rotates synchronously with the driving shafts 5 on both sides, n0=n1=n2, wherein n0 is the rotation speed of the driving wheel 2, n1 and n2 are the rotation speeds of the two driving shafts 5 respectively, and the differential wheel device 3 and the speed limiting wheel device 4 rotate synchronously and do not work; when one side slips, the rotation speed n2 of the slipping side increases, and the first bevel gear 14 and the second bevel gear 15 of the differential device 3 rotate relative to each other, that is, the driving shaft 5 on this side rotates relative to the driving wheel 2, and at the same time, the driving wheel 2 and the non-slipping side driving shaft 5 also rotate relative to each other, and the relative rotation speed difference is equal, that is, n2>n0>n1, and the rotation speed of the non-slipping side driving shaft 5 can be used to limit the rotation speed of the slipping side driving shaft 5, thereby limiting the rotation speed ratio of the left and right wheels;

[0064] The wheel speed on the side with slower rotation speed is used to limit the wheel speed on the side with faster rotation speed, thereby achieving the purpose of limiting the range of the wheel speed ratio on both sides.

[0065] The following situations presuppose that the same fixed rotation speed of the driving wheel 2 is available.

[0066] When both wheels on both sides are on the ground and are subjected to the same external force, all components rotate with the driving wheel 2, and the rotation speed is the same as that of the driving wheel 2. Each component does not rotate on its own, and the rotation speed of the wheels on both sides is the same.

[0067] When one side of the wheel slips, the driving shaft 5 on this side accelerates, and the self-rotation of the speed limiting gear rod 9 engaged therewith rotates in the opposite direction relative to the driving shaft 5; the driving shaft 5 on the other non-slipping side decelerates, and the self-rotation direction of the speed limiting gear rod 9 is the same as that of the driving shaft 5, and the driving wheel 2 drives the speed limiting gear rod 9 to rotate around the driving shaft 5 along the rotation direction of the driving shaft 5. Since the reduction gear 12 performs a deceleration motion relative to the constant speed gear 11, the rotation speed of the second bevel gear 15 is less than the rotation speed of the driving wheel 2, but at this time the planetary gear 16 and the driving wheel 2 have the same orbital speed, so the torque is transmitted to the driving shaft 5, causing the driving shaft 5 to rotate, so that the rotation speed of the non-slipping side driving shaft 5 has a lower limit; the rotation direction of the speed limiting gear rod 9 on the non-slipping side is opposite to the rotation direction of the speed limiting gear rod 9 on the slipping side, and the rotation speed is the same, so the speed limiting gear rod 9 on the non-slipping side limits the rotation speed of the speed limiting gear rod 9 on the slipping side, thereby limiting the rotation speed of the slipping side driving shaft 5, so that the rotation speed of the slipping side driving shaft 5 has an upper limit.

[0068] In summary, when the speed of the driving wheel 2 is fixed, the wheels on the left and right sides have an upper limit and a lower limit, and the ratio of the upper limit to the lower limit is the speed ratio of the two wheels, and the interval formed by the minimum and maximum values ​​of the speed ratio is the limited speed ratio interval. The present invention has a speed ratio interval, so that when the wheel slips, the speed will not rise indefinitely, and the non-slip side drive shaft 5 will not stop, so that the non-slip side wheel can continue to move forward. The present invention is different from a conventional limited slip differential. The speed of one side wheel is used to limit the speed of the other side wheel, and the speed ratio interval can be achieved between the two wheels, so that the power can be transmitted to the non-slip side without a differential lock, and the normal driving of the vehicle can be achieved.

[0069] The above-mentioned specific embodiments are only specific cases of the present invention. The patent protection scope of the present invention includes but is not limited to the product form and style of the above-mentioned specific embodiments. Any real-time torque differential that complies with the claims of the present invention and any appropriate changes or modifications made thereto by ordinary technicians in the relevant technical field shall fall within the patent protection scope of the present invention.

Claims

1. A real-time torque differential, characterized in that: It comprises two sets of differential devices, which are arranged on both sides of the driving wheel, and the differential device comprises a driving wheel, a differential wheel device, a speed limiting wheel device and a driving shaft. The driving wheel is provided with a plurality of mounting grooves evenly distributed along the axis, and the driving wheel is fixedly connected with a plurality of driving rods, and the driving rods are connected to the differential wheel device; The speed limiting wheel device is arranged between the driving wheel and the differential wheel device, one side of the speed limiting wheel device is connected to the mounting groove, and the other side is connected to the differential wheel device; The two speed limiting wheel devices at corresponding positions on the two sets of differential devices are installed in the same installation groove, and the two speed limiting wheel devices are connected by gear meshing; The driving shaft is connected to the differential wheel device and the speed limiting wheel device; The speed limiting wheel device comprises a first speed limiting gear, a speed limiting gear rod and a second speed limiting gear arranged on the driving shaft; The first speed limiting gear is arranged on the differential wheel device; The speed limiting gear rod comprises a constant speed gear, a reduction gear and an intermediate gear, the constant speed gear is coaxially fixedly connected with the reduction gear, a rotating shaft is provided on one side of the constant speed gear, the intermediate gear is provided on the rotating shaft, and the rotating shaft is rotatably installed in the installation groove; The constant speed gear is meshed with the second speed limiting gear, and the reduction gear is meshed with the first speed limiting gear; The mounting groove includes two sliding holes, a gear groove is connected between the two sliding holes, and the two speed limiting gear rods at corresponding positions on the two sets of differential devices are respectively installed in the two sliding holes through the rotating shaft, and are meshed and connected through the intermediate gear, and the intermediate gear is arranged in the gear groove; The differential gear device includes a first bevel gear, a second bevel gear and a planetary gear. The first bevel gear is coaxially fixedly connected to the drive shaft, the first speed limiting gear is coaxially fixed to the second bevel gear, the planetary gear is meshed with the first bevel gear and the second bevel gear, and the planetary gear is rotatably connected to the drive rod.

2. A real-time torque differential according to claim 1, characterized in that: The first speed limiting gear is an internal gear.

3. A real-time torque differential according to claim 2, characterized in that: The driving shaft passes through the second bevel gear and is connected to the speed limiting gear rod.

4. A real-time torque differential according to claim 1, characterized in that: The differential device is provided with a shell outside, the shell is fixed on the driving wheel, the driving rod is fixed on the shell, and the driving rod is fixedly connected to the driving wheel through the shell.

5. The real-time torque differential according to claim 1, characterized in that: The pitch circle diameter of the constant speed gear is larger than the pitch circle diameter of the reduction gear, and the speed limiting gear rod is used to transmit differential torque to the drive shaft to limit the speed ratio of the left and right wheels of the vehicle.

6. The real-time torque differential according to claim 1, characterized in that: There are 2 to 4 installation grooves, and 2 to 4 speed limiting wheel devices correspondingly installed in the installation grooves are arranged on the same differential device.

7. The real-time torque differential according to claim 1, characterized in that: The rotating shaft is installed in the sliding hole through the bearing bush.

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