A torque differential

Abstract

This invention relates to a torque differential, which includes a first sun gear disposed on a first shaft and a second sun gear disposed on a second shaft. The first sun gear and the second sun gear are disposed opposite to each other. One or more layers of bevel gears are meshed between the first sun gear and the second sun gear. The first sun gear and the second sun gear respectively mesh with different layers or different heights of the bevel gears. The bevel gears are disposed on planetary shafts. The first shaft and the second shaft are coaxial.

Description

Technical Field

[0001] The invention relates to a differential, in particular to a torque differential. Background Art

[0002] When a bicycle is running, the rear wheel bears more load, while the front wheel bears relatively less load. In the prior art, differential transmission of the front and rear wheels of the bicycle can be realized, but torsion transmission of the front and rear wheels cannot be realized, and the power delivered to the front and rear wheels cannot be distributed in the best or appropriate distribution ratio, resulting in unreasonable power output, unnecessary power loss, and waste of physical strength of the rider, and unnecessary damage to bicycle tires and other parts. Therefore, a torsion differential that can output different torques is needed to make up for the shortcomings of the prior art. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a torque differential capable of outputting different torques.

[0004] To solve the above problems, the technical solution adopted by the present invention is:

[0005] A torque differential comprises a first sun gear arranged on shaft one and a second sun gear arranged on shaft two, the first sun gear and the second sun gear are arranged opposite to each other, more than one layer of bevel gears are meshed between the first sun gear and the second sun gear, the first sun gear and the second sun gear are respectively meshed with different layers or different heights of the bevel gears; the bevel gears are arranged on planetary shafts, and the first shaft and the second shaft are arranged coaxially.

[0006] As a further improvement of the present invention, the bevel gear is a double-layer bevel gear, which includes an upper meshing tooth and a lower meshing tooth, and the first sun gear and the second sun gear are respectively meshed with the upper meshing tooth and the lower meshing tooth.

[0007] As a further improvement of the present invention, the axis one and the axis two are the same central axis, and the first sun gear and the second sun gear are rollingly arranged on the central axis; a left sprocket and a right sprocket are also rollingly arranged on the central axis, and the left sprocket and the right sprocket are fixedly arranged with the first sun gear and the second sun gear respectively.

[0008] As a further improvement of the present invention, the torque differential is further provided with a planet carrier, a gear plate is provided on the left side of the planet carrier, the gear plate and the planet carrier are rotatably arranged on the shaft one and the shaft two, and the planet shaft is fixed on the planet carrier.

[0009] As a further improvement of the present invention, a shielding device is provided on the periphery of the differential.

[0010] A torque differential, comprising a planetary shaft fixedly arranged on a central shaft, more than one layer of bevel gears arranged on the planetary shaft, a left sprocket rollingly arranged on a frame, and a right sprocket rollingly arranged on the frame, wherein torque converter components are respectively arranged between the left sprocket, the right sprocket and the bevel gears;

[0011] The torque converter assembly includes a first bevel gear ring rollingly arranged on the frame and a second bevel gear ring arranged on the first bevel gear ring, the first bevel gear ring and the second bevel gear ring are meshed with the bevel gear, and the first bevel gear ring and the second bevel gear ring are respectively connected to the left sprocket and the right sprocket through a clutch assembly.

[0012] As a further improvement of the present invention, the bevel gear is a double-layer bevel gear, and the double-layer bevel gear includes an upper layer of meshing teeth and a lower layer of meshing teeth, and the upper layer of meshing teeth and the lower layer of meshing teeth are respectively meshed with the first bevel gear ring and the second bevel gear ring.

[0013] As a further improvement of the present invention, the engagement assembly includes a dial body driven by a shift fork, a first shift block and a second shift block are provided on one side of the dial body, and a connecting rod is provided on the other side, the connecting rod is slidably arranged in the through holes on the left and right sprockets, the first shift block is inserted and pulled out in the first slot, the second shift block is clamped in the second slot, the first slot is arranged on the second bevel gear ring or the first bevel gear ring, and the second slot is arranged on the first bevel gear ring or the second bevel gear ring.

[0014] As a further improvement of the present invention, the first clamping groove is arranged on the first bevel gear ring, and the second clamping groove is arranged on the second bevel gear ring.

[0015] As a further improvement of the present invention, a shielding device is arranged on the periphery of the differential.

[0016] The beneficial effects of adopting the above technical solution are:

[0017] When the torque differential device of the present invention is applied to a dual-drive bicycle, power is input through the middle shaft to drive the bevel gear to rotate, and the sun gear is meshed with the bevel gear at different layers or different heights. Under the condition of the same driving force, the force arms are different, so that different torques are output to the left sprocket and the right sprocket, so that different torques are transmitted to the front and rear wheels of the bicycle, and the power is reasonably distributed between the front and rear wheels, thereby reducing unnecessary power loss and avoiding damage to various parts of the bicycle caused by unreasonable distribution of power between the front and rear wheels.

[0018] The design concept of the torsion differential of the present invention can also be used as a torsion differential between two front wheels and two rear wheels of a four-wheel drive vehicle. Power is input through a toothed disc, and the toothed disc and the planet carrier drive the bevel gears on the planetary shafts to rotate. Different layers or different heights of the bevel gears are respectively meshed with sun gears at different heights to transmit different torques to shaft one and shaft two, and then shaft one and shaft two transmit different torques to the front wheels and rear wheels of the vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 It is a structural schematic diagram of the bevel gear of the present invention being a single-layer bevel gear.

[0021] Figure 2 It is a schematic structural diagram of a single high-layer bevel gear of the present invention when a bearing is provided.

[0022] Figure 3 It is a structural schematic diagram of the bevel gear of the present invention being a double-layer bevel gear.

[0023] Figure 4 It is a schematic structural diagram of the double-layer bevel gear of the present invention when a bearing is provided.

[0024] Figure 5 It is a schematic diagram of the structure in which the bevel gear of the present invention is composed of multiple bevel gears a.

[0025] Figure 6 It is a schematic structural diagram of the present invention when multiple bevel gears a are provided with bearings.

[0026] Figure 7 It is a structural diagram of embodiment 1 of the present invention.

[0027] Figure 8 It is a structural diagram of embodiment 2 of the present invention.

[0028] Fig. 9 It is a structural diagram of embodiment 3 of the present invention.

[0029] Fig.10 The present invention Fig. 9 Schematic diagram of the partially enlarged structure of part A in the middle.

[0030] Fig.11 This is another structural diagram for realizing twisting

[0031] Among them: 1 axis 1, 2 first sun gear, 3 axis 2, 4 second sun gear, 5 planetary shaft, 6 double-layer bevel gear, 6-1 upper meshing teeth, 6-2 lower meshing teeth, 7 middle shaft, 8 left sprocket, 9 right sprocket, 10 planet carrier, 11 toothed disc, 12 frame, 13 second slot, 14 first bevel gear ring, 15 first slot, 16 second bevel gear ring, 17 shift fork, 18 shift plate body, 19 second shift block, 20 first shift block, 21 connecting rod, 22 single-layer bevel gear, 23 bevel gear a, 24 bevel gear b, 25 inner gear ring, 26 one-way gear, 27 outer gear ring, 28 one-way gear shaft, 29 bearing. DETAILED DESCRIPTION

[0032] In order to make the objectives, technical solutions and advantages of the present invention more clear, the present invention is clearly and completely described below in conjunction with the accompanying drawings and specific embodiments.

[0033] Example 1

[0034] like Figure 3 , 7 As shown, a torque differential comprises a first sun gear 2 arranged on shaft 1 and a second sun gear 4 arranged on shaft 2 3, wherein the first sun gear 2 and the second sun gear 4 are arranged opposite to each other, and a single-layer, double-layer or more than two-layer bevel gear is meshed between the first sun gear 2 and the second sun gear 4, and the first sun gear 2 and the second sun gear 4 are respectively meshed with different layers or different heights of the bevel gear. The bevel gear is arranged on the planetary shaft 5, and a bearing 29 may or may not be arranged between the bevel gear and the planetary shaft 5, and the shaft 1 and the shaft 2 3 are arranged coaxially.

[0035] In the present invention, a single-layer, double-layer or double (two) or more-layer bevel gear can be a single-layer bevel gear 22 (such as Figure 1-2 As shown), it can be a bevel gear with two or more layers of meshing teeth to achieve double or multiple layers (such as Figure 3-4 As shown), or two or more bevel gears a23 are continuously arranged on the planet shaft 5 to realize double or multi-layer (as shown Figure 5-6 As shown in the figure), the meshing with sun gears at different heights is realized, and different meshing force arms are realized under the same driving force, so as to realize torque transmission. In the present invention, two or more layers of meshing teeth (such as Figure 3-4 As shown in the figure), the meshing teeth at different layers are meshed with the sun gears at different heights to realize torque transmission.

[0036] In this embodiment, the bevel gear is a double-layer bevel gear 6, which includes an upper meshing tooth 6-1 and a lower meshing tooth 6-2, and the first sun gear 2 and the second sun gear 4 are meshed with the upper meshing tooth 6-1 and the lower meshing tooth 6-2 respectively.

[0037] like Figure 7 As shown, in this embodiment, a specific application of a torsion differential on a bicycle is given, wherein the shaft 1 and the shaft 2 3 are the same middle shaft 7, and the first sun gear 2 and the second sun gear 4 are rollingly arranged on the middle shaft 7. A left sprocket 8 and a right sprocket 9 are also rollingly arranged on the middle shaft 7, and the left sprocket 8 and the right sprocket 9 are fixedly arranged with the first sun gear 2 and the second sun gear 4, respectively.

[0038] The pedals of the bicycle are connected to the middle shaft 7. The pedals are driven to rotate the middle shaft 7 to input power. The middle shaft 7 drives the planetary shaft 5 to rotate. The double-layer bevel gear 6 arranged on the planetary shaft 5 (in this embodiment, the planetary shaft is a cross shaft) is respectively meshed with the first sun gear 2 and the second sun gear 4 of different heights through the upper meshing teeth 6-1 and the lower meshing teeth 6-2, and different torques are transmitted to the left sprocket 8 and the right sprocket 9, so that different power is transmitted to the front and rear wheels of the bicycle, and the torque is reasonably distributed while achieving differential speed. According to the actual driving conditions of the bicycle, the actual loads borne by the front and rear wheels, or other conditions, the appropriate torque transmission of the front and rear wheels can be achieved by selecting, adjusting or replacing the meshing of the left and right meshing parts with the meshing teeth of different layers.

[0039] Example 2

[0040] Different from the first embodiment, the torque differential in this embodiment is used between the two front wheels and the two rear wheels of the four-wheel drive vehicle, and can realize the torque differential transmission between the two front wheels and the two rear wheels.

[0041] like Figure 8 As shown, the torque differential is also provided with a planet carrier 10, and a gear plate 11 is provided on the left side of the planet carrier 10. The gear plate 11 and the planet carrier 10 are rotatably arranged on the shaft 1 and the shaft 2 3, and the planet shaft 5 is fixed on the planet carrier 10.

[0042] Power is input through the gear plate 11, and the gear plate 11 and the planet carrier 10 drive the double-layer bevel gear 6 on the planet shaft 5 to rotate. The upper meshing teeth 6-1 and the lower meshing teeth 6-2 of the double-layer bevel gear 6 transmit different torques to shaft 1 and shaft 2 3 through the first sun gear 2 and the second sun gear 4 of different heights respectively, and then shaft 1 and shaft 2 3 transmit different torques to the front wheels and rear wheels of the car, thereby achieving output of different torques.

[0043] Example 3

[0044] like Figure 9-10As shown, a torque differential comprises a planetary shaft 5 fixedly arranged on a central shaft 7, a single-layer, double-layer or double (two) or more-layer bevel gear arranged on the planetary shaft 5, a left sprocket 8 rollingly arranged on a frame 12 and a right sprocket 9 rollingly arranged on the frame 12, and torque converter components are respectively arranged between the left sprocket 8 and the right sprocket 9 and the bevel gears.

[0045] The torque converter assembly includes a first bevel gear ring 14 rollingly mounted on the frame 12 and a second bevel gear ring 16 mounted on the first bevel gear ring 14, wherein the first bevel gear ring 14 and the second bevel gear ring 16 are meshed with the bevel gear. The first bevel gear ring 14 and the second bevel gear ring 16 are connected to the left sprocket 8 and the right sprocket 9 respectively through a shifting assembly.

[0046] In this embodiment, the bevel gear is a double-layer bevel gear 6, and the double-layer bevel gear 6 includes an upper meshing tooth 6-1 and a lower meshing tooth 6-2, and the upper meshing tooth 6-1 and the lower meshing tooth 6-2 are respectively meshed with the first bevel gear ring 14 and the second bevel gear ring 16.

[0047] like Fig.10 As shown, the engaging assembly includes a dial body 18 driven by a shift fork 17, a first shift block 20 and a second shift block 19 are provided on one side of the dial body 18, and a connecting rod 21 is provided on the other side. The connecting rod 21 is slidably provided in the through holes on the left and right sprockets 8 and 9, the first shift block 20 is inserted and pulled in the first clamping groove 15, the second shift block 19 is clamped in the second clamping groove 13, the first clamping groove 15 is provided on the first bevel gear ring 14 or the second bevel gear ring 16, and the second clamping groove 13 is provided on the first bevel gear ring 14 or the second bevel gear ring 16. In this embodiment, the first clamping groove 15 is provided on the first bevel gear ring 14, and the second clamping groove 13 is provided on the second bevel gear ring 16.

[0048] like Fig.10As shown, the cross-sectional height of the right side of the second shift block 19 is greater than that of the left side, and the shape of the second clamping groove 13 is adapted thereto. The cross-sectional height of the right side of the first shift block 20 is less than that of the left side, and the shape of the first clamping groove 15 is adapted thereto. The connection between the side with a larger height and the side with a smaller height of the clamping block can be an inclined surface, a vertical surface, or a tooth surface or other irregular shapes (the shape of the clamping groove is adapted to the clamping block), mainly for the convenience of contact with the clamping groove, so that the clamping groove drives the clamping block to apply a force to the clamping block, thereby realizing that the clamping groove drives the clamping block to rotate (that is, the gear ring transmits the force to the sprocket through the clamping groove and the clamping block). In this embodiment, an inclined surface is used. The first clamping groove 15 and the second clamping groove 13 can be a corresponding groove on the corresponding bevel gear ring, or a corresponding slot hole can be set on the surface of the corresponding bevel gear ring. In this embodiment, the latter is used, and a corresponding slot hole is set on the surface of the corresponding bevel gear ring. The slots are circular slots in a trapezoidal shape. The large hole ends and small hole ends of the circular slots of the corresponding first card slots 15 and second card slots 13 are inverted with each other. The corresponding first shifting blocks 20 and second shifting blocks 19 are trapezoidal blocks adapted to the circular slots.

[0049] By moving the shift fork 17, the force arms on the left and right sides are changed, so that the output torques on the left and right sides are different when the driving force is the same. Fig.10 As shown, the torque change is explained by taking the shifting of the right shift fork 17 as an example. When the shift fork 17 moves to the right, it pushes the first shift block 20 and the second shift block 19 to move to the right, and the first shift block 20 contacts the inner wall of the first slot 15 (trapezoidal circular slot hole), while the second shift block 19 does not contact the inner wall of the second slot 13 (trapezoidal circular slot hole opposite to the first slot). At this time, the double-layer bevel gear 6 drives the first bevel gear ring 14 and the second bevel gear ring 16 to rotate at the same time, but only drives the first shift block 20 to rotate through the inner wall of the first slot 15 on the first bevel gear ring 14, and transmits the force to the first shift block 20, and then to the right sprocket 9. When the shift fork 17 moves to the left, it pushes the first shift block 20 and the second shift block 19 to move to the left, and the second shift block 19 contacts the inner wall of the second slot 13, while the first shift block 20 does not contact the inner wall of the first slot 15. At this time, the double-layer bevel gear 6 drives the first bevel gear ring 14 and the second bevel gear ring 16 to rotate at the same time, but only drives the second shift block 19 to rotate through the inner wall of the second slot 13 on the second bevel gear ring 16, and transmits the force to the second shift block 19, and then to the right sprocket 9. When the shift forks 17 on both sides are shifted inward or outward, the output torque on both sides is the same. When the left and right shift forks 17 are shifted to the right, the torque output on the left is greater than the torque output on the right; similarly, when the left and right shift forks 17 are shifted to the left, the torque output on the right is greater than the torque output on the left.

[0050] The differential is provided with a shielding device at the periphery, which isolates the differential from the outside world, dust, people and parts of the differential, etc., to ensure the personal safety of operators and make the differential safer during operation. The shielding device can be a baffle or a cover.

[0051] In addition to the above-mentioned inventive concept of realizing the separation, the present invention also Fig.11 Another concept for realizing a torsion differential is provided, which is a torsion differential, comprising a planetary shaft 5 fixedly arranged on a central shaft 7, a bevel gear b24 arranged on the planetary shaft 5, a first sun gear 2 and a second sun gear 4 rollingly arranged on a frame 12, and a left sprocket 8 and a right sprocket 9 rollingly arranged on the frame 12, the first sun gear 2 and the second sun gear 4 being meshed with the bevel gear b24, and torque converter assemblies being arranged between the first sun gear 2 and the left sprocket 8, and between the second sun gear 4 and the right sprocket 9, respectively.

[0052] The torque converter assembly includes an inner gear ring 25, two or more one-way gears 26 and an outer gear ring 27, which are rollingly arranged on the middle shaft 7. The inner gear ring 25 is fixed to the sprocket. The one-way gear 26 is arranged between the inner gear ring 25 and the outer gear ring 27, and meshes with the inner gear ring 25 and the outer gear ring 27 respectively. The one-way gear 26 is arranged on the one-way gear shaft 28, and the one-way gear shaft 28 is fixedly arranged on the sun gear. The outer gear ring 25 is provided with a brake ring, a ratchet ring or a disc brake pad, etc., which can stop the outer gear ring 25 from rotating under the action of external force. In this concept, a brake ring is provided. Power is input through the middle shaft 7, and the middle shaft 7 drives the planetary shaft 5 and the bevel gear b24 to rotate. The bevel gear b24 drives the first sun gear 2 and the second sun gear 4 to rotate. The first sun gear 2 and the second sun gear 4 drive the inner and outer gear rings to rotate through the one-way gear 26, and transmit the power to the left and right sprockets.

[0053] by Fig.11The torque-splitting process is explained by taking the case where the outer gear ring 27 on the left side is not braked and the outer gear ring 27 on the right side is braked or not braked as an example. When the outer gear ring 27 on the right side is braked, the one-way gear shaft 28 drives the one-way gear 26 to rotate. Since the driving force is on the one-way gear shaft 28 at this time, the force point is on the axis of the one-way gear shaft 28, and the resistance is on the inner gear ring 25, the force point is on the outer surface of the one-way gear 28, the force arm is different, so the driving force is required to be greater than the resistance, but the entire torque-splitting differential is not differential, so that the driving forces on both sides are always the same. Therefore, at this time, the output torque on the left side is large and the output torque on the right side is small. If the outer gear ring 27 on the right side is not braked, the entire torque-splitting differential can be regarded as a whole. At this time, the driving force is equal to the resistance, and the output torque on the left and right sides is equal. That is to say, when the outer gear rings 27 on the left and right sides are braked or not braked, the torque output on the left and right sides is the same, but the sprocket speeds on both sides become faster when both are braked; when one side is braked and the other side is not braked, the torque on the braked side is less than the output torque on the non-braked side, thereby achieving the effect of adjusting the torque. This concept can be used on a dual-drive bicycle, and can also be used on a motor vehicle.

[0054] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A torque differential for a dual-drive bicycle, characterized in that: It comprises a planetary shaft (5) fixedly arranged on a central shaft (7), more than one layer of bevel gears arranged on the planetary shaft (5), a left sprocket (8) rollably arranged on a frame (12), and a right sprocket (9) rollably arranged on the frame (12), wherein torque converter components are respectively arranged between the left sprocket (8) and the right sprocket (9) and the bevel gears; The torque converter assembly comprises a first bevel gear ring (14) rollingly arranged on the frame (12) and a second bevel gear ring (16) arranged on the first bevel gear ring (14), the first bevel gear ring (14) and the second bevel gear ring (16) meshing with the bevel gear at different layers or different heights, and the first bevel gear ring (14) and the second bevel gear ring (16) are respectively connected to the left sprocket (8) and the right sprocket (9) via a clutch assembly; The engaging assembly comprises a dial body (18) driven by a shift fork (17); a first shift block (20) and a second shift block (19) are arranged on one side of the dial body (18); and a connecting rod (21) is arranged on the other side; the connecting rod (21) is slidably arranged in through holes on the left and right sprockets (8, 9); the first shift block (20) is inserted and removed in a first clamping groove (15); the second shift block (19) is clamped in a second clamping groove (13); the first clamping groove (15) is arranged on the first bevel gear ring (14); and the second clamping groove (13) is arranged on the second bevel gear ring (16); The cross-sectional height of the right side of the second shift block (19) is greater than that of the left side thereof, and the shape of the second slot (13) is adapted thereto; the cross-sectional height of the right side of the first shift block (20) is less than that of the left side thereof, and the shape of the first slot (15) is adapted thereto; the first slot (15) and the second slot (13) are circular hole slots, and the shape of the circular hole is trapezoidal; the large hole end and the small hole end of the circular hole of the corresponding first slot (15) and the second slot (13) are inverted with each other, and the corresponding first shift block (20) and the second shift block (19) are trapezoidal blocks adapted to the circular hole; The connection between the side with a larger height and the side with a smaller height of the card block is an inclined surface, a vertical surface or a toothed surface, which is used to contact the card slot. The card slot applies a force to the card block, so that the card slot drives the card block to rotate; When the shift fork (17) moves to the right, it pushes the first shift block (20) and the second shift block (19) to move to the right, the first shift block (20) contacts the inner wall of the first clamping groove (15), and the second shift block (19) does not contact the inner wall of the second clamping groove (13); the first shift block (20) is driven to rotate by the inner wall of the first clamping groove (15) on the first bevel gear ring (14), and the force is transmitted to the first shift block (20), and then transmitted to the right sprocket (9); When the shift fork (17) moves leftward, it pushes the first shift block (20) and the second shift block (19) to move leftward, the second shift block (19) contacts the inner wall of the second clamping groove (13), and the first shift block (20) does not contact the inner wall of the first clamping groove (15); the inner wall of the second clamping groove (13) on the second bevel gear ring (16) drives the second shift block (19) to rotate, and transmits force to the second shift block (19), and then transmits it to the right sprocket (9).

2. A torque differential for a dual-drive bicycle according to claim 1, characterized in that: The bevel gear is a double-layer bevel gear (6), and the double-layer bevel gear (6) comprises an upper layer of meshing teeth (6-1) and a lower layer of meshing teeth (6-2), and the upper layer of meshing teeth (6-1) and the lower layer of meshing teeth (6-2) are respectively meshed with the first bevel gear ring (14) and the second bevel gear ring (16).

3. A torque differential for a dual-drive bicycle according to any one of claims 1 to 2, characterized in that: A shielding device is arranged on the periphery of the differential.

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