CN210510174U - Electric vehicle gearbox - Google Patents

Abstract

The utility model belongs to the technical field of the gearbox, a electric motor car gearbox is disclosed, its aim at make better adaptation slope great mountain region such as electric motor car regional. The utility model discloses a transmission housing, change gear device, input shaft and output shaft, input shaft, output shaft are fixed on transmission housing through first bearing frame, second bearing frame respectively, and change gear device establishes drive gear, output mechanism and the speed change mechanism of the driving gear on the input shaft and driving gear one side including the cover. The utility model realizes the speed change by setting the gear ratio of the gear in the speed change mechanism; the multiple groups of speed change assemblies realize corresponding speed change accumulation, and the speed change range is improved; then the transmission mechanism is arranged at different positions, thereby smoothly realizing multi-stage speed change. The utility model discloses simple structure is practical, can extensively apply to electric motor car and other facility equipment that have high moment of torsion variable speed demand.

Description

Electric vehicle gearbox

Technical Field

The utility model belongs to the technical field of the gearbox, concretely relates to electric motor car gearbox.

Background

The existing electric vehicle driving device generally adds a first-stage speed reducing mechanism to a driving motor, but the driving device has the following problems: 1. when going uphill and during heavy-load acceleration, the current is large, the power consumption is large, and the power is insufficient to be applicable when going uphill. When the battery is on a slope and is accelerated under heavy load, the current is easy to increase sharply, the efficiency of a driving motor is low, the controller and the motor are easy to burn, and meanwhile, the service life of the storage battery is directly influenced by large-current discharge; 2. the comprehensive efficiency of running under various road conditions is low, and the endurance mileage is short; 3. poor acceleration performance and weak climbing energy.

SUMMERY OF THE UTILITY MODEL

In order to solve at least one of the above-mentioned problems that exist among the prior art, the utility model provides an electric motor car gearbox.

The utility model discloses the technical scheme who adopts does:

a gearbox of an electric vehicle comprises a gearbox shell, a speed change gear device, an input shaft and an output shaft, wherein the input shaft and the output shaft are respectively fixed on the gearbox shell through a first bearing seat and a second bearing seat; the speed change gear device comprises a driving gear sleeved on the input shaft, and a transmission mechanism, an output mechanism and a speed change mechanism which are arranged on one side of the driving gear;

the transmission mechanism comprises a switching rotating shaft, and a second gear and a first gear meshed with the driving gear are coaxially arranged on the switching rotating shaft;

the output mechanism comprises a third gear and a fourth gear which are arranged on the output shaft in a layered mode, under the condition of normal output, the output mechanism, the switching rotating shaft and the input shaft are positioned on the same straight line, and at the moment, the third gear and the second gear are arranged in a meshed mode;

the speed change mechanism comprises at least one group of speed change assemblies, each group of speed change assemblies comprises a speed change piece and a transmission piece arranged on one side of the speed change piece, each speed change piece comprises a gear rotating shaft, each gear rotating shaft is fixed on the shell of the speed change box through a third bearing seat, and a fifth gear and a sixth gear are coaxially arranged on each gear rotating shaft; the transmission part comprises a transmission rotating shaft and a transmission gear arranged on the transmission rotating shaft, the transmission rotating shaft is fixed on the gearbox shell through a fourth bearing seat, and the transmission gear is meshed with a fourth gear and a sixth gear respectively;

when a plurality of groups of speed change assemblies are arranged, the transmission gear of the next group of speed change assemblies is meshed with the sixth gear of the previous group of speed change assemblies;

the gear ratio of the fifth gear to the sixth gear is not equal to 1;

in the gear switching state, the gear rotating shaft, the switching rotating shaft and the input shaft are positioned on the same straight line; at the moment, the sixth gear is meshed with the second gear;

and a driving mechanism for driving the transmission mechanism to rotate around the input shaft is also arranged.

With regard to the arrangement of the speed change assemblies, it is preferable that, in the case where a plurality of sets of speed change assemblies are provided, the gear ratio of the fifth gear to the sixth gear of any one set of speed change assemblies is increased or decreased in comparison with the gear ratio of the fifth gear to the sixth gear of the last set of speed change assemblies.

The speed change assemblies can be arranged in other manners, preferably, under the condition that a plurality of groups of speed change assemblies are arranged, the speed change assemblies further comprise seventh gears coaxially arranged on the gear rotating shafts, the seventh gears of the groups of speed change assemblies are meshed with the transmission gears of the previous group of speed change assemblies, and the sixth gears of the groups of speed change assemblies are meshed with the transmission gears of the next group of speed change assemblies.

Preferably, the tooth ratio of the seventh gear to the sixth gear is not equal to 1.

When the driving mechanism is arranged, preferably, the driving mechanism comprises a rotating arm, a sleeve and a fixed column, wherein a seventh bearing seat is arranged at one end of the rotating arm, the rotating arm is sleeved on a switching rotating shaft through the seventh bearing seat, a switching disc is arranged at the other end of the rotating arm, the switching disc is sleeved in the sleeve, a second bulge is arranged outside the switching disc, a sliding groove matched with the second bulge is arranged in the sleeve, the second bulge is embedded in the sliding groove, and a first inclined wall is arranged on one side of the sliding groove;

a switching piece for driving the sleeve to rotate is also arranged;

the switching disc is sleeved outside the fixed column, a plurality of groups of first bulges are uniformly arranged in the switching disc along the circumferential direction of the switching disc, a plurality of groups of third bulges are uniformly arranged outside the fixed column along the circumferential direction of the fixed column, a groove is arranged between every two adjacent groups of third bulges, and the size of the groove is matched with that of the first bulges; the bottom of the fixed column is also provided with a chassis, and an elastic part is arranged between the chassis and the switching disc in a contact manner.

Preferably, two groups of the second bulges are symmetrically arranged on the switching disk, and two groups of sliding grooves corresponding to the second bulges are arranged in the sleeve.

Preferably, the sliding groove comprises a first inclined wall and a second inclined wall which are symmetrically arranged, the first inclined wall and the second inclined wall are connected through a connecting wall at the top of the sleeve, and the width of the connecting wall is matched with the size of the second protrusion.

Preferably, one end of the third protrusion, which is close to the chassis, is provided with a tip part, and the tip part is an isosceles triangle tip part.

When the switching piece is arranged, preferably, the switching piece comprises a switching rod, one end of the switching rod is provided with a bayonet, the other end of the switching rod is connected with a rotating rod, the other end of the rotating rod is provided with a rotating shaft, and the rotating rod can rotate around the rotating shaft; a first abutting joint and a second abutting joint are respectively arranged at two ends of the bayonet; the bottom of the sleeve is uniformly provided with switching convex columns, an annular groove is formed in the gearbox shell, and one end of the rotating rod, which is far away from the rotating shaft, is clamped in the annular groove; under the gear switching state, the first abutting head and the second abutting head are kept in contact with the switching convex column.

Preferably, one end of the input shaft, which penetrates out of the transmission case, is provided with a motor brush conducting device.

The utility model has the advantages that:

1. by arranging the transmission mechanism, when the transmission mechanism directly acts with the output mechanism, the driving device of the electric vehicle inputs power from the input shaft and outputs the power through the output shaft; when the transmission mechanism and a group of speed change assemblies close to the output shaft in the speed change mechanism act, the gear ratio of a fifth gear and a sixth gear on the same shaft of the speed change assemblies is not 1, so that the speed change effect can be realized; when the transmission mechanism acts with the subsequent different groups of speed change mechanisms, the gear ratio of the fifth gear to the sixth gear on the subsequent speed change component gradually increases or decreases, so that the purpose of gradual speed change of the gearbox can be realized. In addition, the transmission piece in the speed change assembly is arranged to play a role in steering the output direction, so that the rotation directions output by the output shaft are kept consistent after different speed change assemblies are switched.

2. The utility model discloses a set up the seventh gear, the sixth gear and the seventh gear of arbitrary variable speed subassembly have still changed holistic gear drive ratio at the transmission in-process to realize the accumulation of variable speed, and then enlarged holistic variable speed range. On the basis of realizing the variable speed, the utility model discloses also can realize the increase of moment of torsion simultaneously to improve the biggest climbing ability of electric motor car, increase the duration of electric motor car, improve driving motor work efficiency and increase of service life.

3. In the process of driving the sleeve to rotate, the rotating arm can generate vertical displacement firstly under the action of the second bulge and the sliding groove, so that a gear in the transmission mechanism is staggered with a driving gear and a gear on the output mechanism, and meanwhile, the first bulge on the switching disc is gradually separated from the groove on the fixed column; after the second bulge reaches a certain position, the rotating sleeve simultaneously drives the rotating arm to synchronously rotate, and at the moment, the first bulge is completely separated from the groove, so that the switching of the transmission mechanism among the positions of the output mechanism, the speed change mechanism and the high-order speed change mechanism can be realized. The whole structure is compact and stable, the movement of the transmission mechanism and the speed change of the gearbox can be well realized, and the whole use stability is ensured.

4. The utility model further ensures the working stability of the switching plate and the sleeve by arranging two groups of second bulges and sliding grooves; in addition, the first inclined wall and the second inclined wall are symmetrically arranged, so that the sleeve can be conveniently rotated clockwise and anticlockwise, and the rotating speed can be conveniently increased or decreased. And the protruding point portion that sets up the third is isosceles triangle, and after switching dish rotated certain angle, under the effect of elastic component, the second arch of switching dish received the restriction effect of the protruding point portion of third can be more stable reset to corresponding recess in.

5. The utility model discloses a set up the switching piece, when making the dwang take place the pivoted through the rotation axis, the switching pole then takes place to remove along the orbit of ring channel, owing to switch the projection and set up in telescopic bottom equidistant, consequently, the in-process that the switching pole removed alright stir the sleeve and rotate to the cascaded variable speed action of better realization gearbox. Additionally, the utility model discloses can also be through setting up the rotation of program control rotation axis to realize automatic speed change, reduce driver's intensity of labour, the security also obtains improving.

The advantages of the invention are not limited to the description, but rather are described in greater detail in the detailed description for better understanding.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic structural diagram of the present invention;

fig. 2 is a schematic top view of the present invention;

fig. 3 is a schematic view of a part of the structure of the present invention in the case of an embodiment;

fig. 4 is a partial schematic view of the present invention in the case of yet another embodiment;

fig. 5 is a schematic structural diagram of a driving mechanism in the present invention;

fig. 6 is a schematic structural diagram of a transfer arm according to the present invention;

fig. 7 is a schematic structural view of the sleeve of the present invention;

FIG. 8 is a front view of FIG. 7;

fig. 9 is a schematic structural view of the fixing column of the present invention;

fig. 10 is a schematic structural view of the switching member of the present invention;

fig. 11 is a partial structural schematic view of a motor brush conducting device according to the present invention;

fig. 12 is a partial schematic view of the internal structure of the brush conducting device of the motor of the present invention;

in the figure: 1-gearbox shell, 11-annular groove, 2-speed change gear device, 21-driving gear, 22-transmission mechanism, 221-first gear, 222-second gear, 23-output mechanism, 231-third gear, 232-fourth gear, 24-speed change component, 241-speed change piece, 2411-fifth gear, 2412-sixth gear, 2413-seventh gear, 2414-gear rotating shaft, 242-transmission piece, 3-input shaft, 4-output shaft, 5-rotating arm, 51-switching disk, 52-first protrusion, 53-second protrusion, 6-sleeve, 61-sliding groove, 611-first inclined wall, 612-connecting wall, 613-second inclined wall, 62-switching convex column, 7-fixed column, 7-first inclined wall, 71-chassis, 72-elastic piece, 73-third bulge, 8-switching piece, 81-switching rod, 811-first abutting head, 812-second abutting head, 82-rotating rod, 83-rotating shaft, 9-motor brush conducting device, 91-fixed baffle, 92-carbon brush fixed cover, 93-sealing cover, 94-motor shaft nut, 95-brush axial fixed nut, 96-carbon brush rotating shaft and 97-carbon brush.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

It should be noted that, in the present invention, the embodiments and features of the embodiments may be combined with each other without conflict.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the embodiments of the present invention, it should be noted that the indication of the position or the positional relationship is based on the position or the positional relationship shown in the drawings, or the position or the positional relationship which is usually placed when the product of the present invention is used, or the position or the positional relationship which is conventionally understood by those skilled in the art, and is only for the convenience of describing the present invention and simplifying the description, but it is not to indicate or suggest that the indicated device or element must have a specific position, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used merely to distinguish one description from another, and are not to be construed as indicating or implying relative importance.

In the description of the embodiments of the present invention, it should be further noted that unless otherwise explicitly stated or limited, the terms "disposed" and "connected" should be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; may be directly connected or indirectly connected through an intermediate. For those skilled in the art, the drawings of the above terms in the embodiments with specific meanings in the present invention can be understood in specific situations, and the technical solutions in the embodiments of the present invention are clearly and completely described, and it is obvious that the described embodiments are some embodiments of the present invention, not all embodiments. The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.

The invention will be further explained with reference to the drawings and the specific embodiments.

As shown in fig. 1-10, the utility model relates to an electric vehicle transmission, which comprises a transmission housing 1, a transmission gear device 2, an input shaft 3 and an output shaft 4, wherein the input shaft 3 and the output shaft 4 are respectively fixed on the transmission housing 1 through a first bearing seat and a second bearing seat; the speed change gear device 2 comprises a driving gear 21 sleeved on the input shaft 3, and a transmission mechanism 22, an output mechanism 23 and a speed change mechanism which are arranged on one side of the driving gear 21;

the transmission mechanism 22 comprises a switching rotating shaft, and a second gear 222 and a first gear 221 meshed with the driving gear 21 are coaxially arranged on the switching rotating shaft;

the output mechanism 23 comprises a third gear 231 and a fourth gear 232 which are arranged on the output shaft 4 in a layered manner, under the normal output condition, the output mechanism 23, the switching rotating shaft and the input shaft 3 are in the same straight line, and at the moment, the third gear 231 is meshed with the second gear 222;

the speed change mechanism comprises at least one group of speed change assemblies 24, each group of speed change assemblies 24 comprises a speed change part 241 and a transmission part 242 arranged on one side of the speed change part 241, the speed change part 241 comprises a gear rotating shaft 2414, the gear rotating shaft 2414 is fixed on the transmission case 1 through a third bearing seat, and a fifth gear 2411 and a sixth gear 2412 are coaxially arranged on the gear rotating shaft 2414; the transmission member 242 includes a transmission rotating shaft and a transmission gear disposed on the transmission rotating shaft, the transmission rotating shaft is fixed on the transmission housing 1 through a fourth bearing seat, and the transmission gear is engaged with the fourth gear 232 and the sixth gear 2412 respectively;

when a plurality of groups of speed changing assemblies 24 are arranged, the transmission gear of the next group of speed changing assemblies 24 is meshed with the sixth gear 2412 of the previous group of speed changing assemblies 24;

the gear ratio of the fifth gear 2411 to the sixth gear 2412 is not equal to 1;

in the gear shifting state, the gear rotating shaft 2414, the shifting rotating shaft and the input shaft 3 are in the same straight line; at this time, the sixth gear 2412 is engaged with the second gear 222;

a drive mechanism is also provided for driving the transmission mechanism 22 in rotation about the input shaft 3.

In one embodiment, as shown in fig. 3, in the case where a plurality of sets of the transmission assemblies 24 are provided, the gear ratio between the fifth gear 2411 and the sixth gear 2412 of any one set of the transmission assemblies 24 is increased or decreased compared to the gear ratio between the fifth gear 2411 and the sixth gear 2412 of the previous set of the transmission assemblies 24. Since the final speed change of the different speed change assemblies 24 is only related to the gear ratios of the fifth gear 2411, the sixth gear 2412, the driving gear 21, the first gear 221, the second gear 222 and the fourth gear 232 of the group of speed change assemblies 24 in the embodiment, the present invention can realize the step-by-step speed change under the condition that the gear ratio between the fifth gear 2411 and the sixth gear 2412 of the speed change assemblies 24 is gradually increased or decreased.

In a specific working process, under a normal output condition, the output mechanism 23, the switching rotating shaft and the input shaft 3 are in the same straight line, the power of the input shaft 3 is transmitted by the driving gear 21, the first gear 221, the second gear 222 and the third gear 231 and then output from one end of the output shaft 4, and at the moment, the gear transmission ratio is related to the tooth number setting of the driving gear 21, the first gear 221, the second gear 222 and the third gear 231. In different gear shifting states, the gear rotating shaft 2414, the shifting rotating shaft and the input shaft 3 are in the same straight line, and the gear transmission ratio is related to the tooth number settings among the driving gear 21, the first gear 221, the second gear 222, the fourth gear 232, the fifth gear 2411 and the sixth gear 2412 of the corresponding speed change assembly 24; when multi-stage speed change is required, because the gear ratio between the fifth gear 2411 and the sixth gear 2412 of the latter speed change assembly 24 is gradually increased or decreased, multi-gear step-by-step speed change can be smoothly realized; therefore, the electric vehicle can realize the wider-range speed change and improve the service performance of the electric vehicle.

In another embodiment, as shown in fig. 4, in the case that a plurality of sets of speed changing assemblies 24 are provided, the speed changing assemblies 24 further include a seventh gear 2413 coaxially disposed on the gear rotating shaft 2414, the seventh gear 2413 of the set of speed changing assemblies 24 is disposed in mesh with the transmission gear of the previous set of speed changing assemblies 24, and the sixth gear 2412 of the set of speed changing assemblies 24 is disposed in mesh with the transmission gear of the next set of speed changing assemblies 24. In order to ensure structural stability, the seventh gear 2413, the sixth gear 2412 and the fifth gear 2411 of each group of the speed changing assembly 24 are arranged in order of height.

Further, the ratio of the number of teeth of the seventh gear 2413 to the number of teeth of the sixth gear 2412 is not equal to 1. As for the arrangement of the gear ratios between the seventh gear 2413 and the sixth gear 2412, the gear ratios of the fifth gear 2411 and the sixth gear 2412 of any one set of the speed change assembly 24 may be equal or increased/decreased compared with the gear ratios of the fifth gear 2411 and the sixth gear 2412 of the previous set of the speed change assembly 24. Therefore, the process of gradually accumulating the integral gear ratio can be realized, and the purpose of changing the speed of the gearbox in a wider range can be realized.

In this case, in the process of realizing the stepwise speed change, the speed change mechanism driven by the transmission mechanism 22 and the speed change assembly 24 between the group of speed change mechanisms and the output mechanism 23 each produce a cumulative effect of the speed change. Specifically, under the normal output condition, the output shaft 4, the switching rotating shaft and the input shaft 3 are in the same straight line, the power of the input shaft 3 is transmitted by the driving gear 21, the first gear 221, the second gear 222 and the third gear 231 and then output from one end of the output shaft 4, and at the moment, the gear transmission ratio is related to the tooth number setting of the driving gear 21, the first gear 221, the second gear 222 and the third gear 231. In different gear shifting states, the gear ratio is related to the gear ratios among the driving gear 21, the first gear 221, the second gear 222 and the fourth gear 232, the gear ratio among the fifth gear 2411 and the sixth gear 2412 in the speed changing assembly 24, and the gear ratio among all the seventh gears 2413 and the sixth gear 2412 between the speed changing assembly 24 and the output mechanism 23; therefore the present embodiment can reach the purpose of the gear ratio accumulation between the multiple sets of speed change assemblies 24 to further expand the speed change range of the gearbox, increase the torque, and be right in the high-gradient area with better adaptation the utility model discloses an use.

In driving the rotation of the transmission mechanism 22, in one embodiment, the transmission mechanism 22 may be connected by a connecting rod, and the transmission mechanism 22 may rotate freely around its switching rotation shaft; of course, the connecting rod and the transmission mechanism 22 are connected through a telescopic rod; and the other end of the connecting rod is arranged on the axis of the input shaft 3, the connecting rod and the input shaft 3 do not interfere with each other, and the connecting rod is driven by the stepping motor and rotates around the axis of the input shaft 3. The whole transmission mechanism 22 is longitudinally displaced through the adjustment of the telescopic rod, a gear in the transmission mechanism 22 is separated from a driving gear 21 and an output mechanism 23 or a gear of a speed change mechanism, then the stepping motor drives the transmission mechanism 22 to rotate, the position of the transmission mechanism 22 is changed, and then the telescopic rod is adjusted to enable the gear in the transmission mechanism 22 to be meshed with the driving gear 21 and the gear of the output mechanism 23 or the gear of the speed change mechanism, so that the transmission effect is realized, and the whole adjustment can be realized.

In order to facilitate manual adjustment of the gear position of the transmission, in an embodiment, as shown in fig. 5-9, the driving mechanism includes a rotating arm 5, a sleeve 6 and a fixing post 7, a seventh bearing seat is disposed at one end of the rotating arm 5 and is sleeved on the switching rotating shaft through the seventh bearing seat, a switching disc 51 is disposed at the other end of the rotating arm 5, the switching disc 51 is sleeved in the sleeve 6, a second protrusion 53 is disposed outside the switching disc 51, a sliding groove 61 adapted to the second protrusion 53 is disposed in the sleeve 6, the second protrusion 53 is embedded in the sliding groove 61, and a first inclined wall 611 is disposed at one side of the sliding groove 61;

a switching piece 8 for driving the sleeve 6 to rotate is also arranged;

the switching disk 51 is sleeved outside the fixed column 7, a plurality of groups of first bulges 52 are uniformly arranged in the switching disk 51 along the circumferential direction of the switching disk, a plurality of groups of third bulges 73 are uniformly arranged outside the fixed column 7 along the circumferential direction of the fixed column, a groove is arranged between every two adjacent groups of third bulges 73, and the size of the groove is matched with that of the first bulges 52; the bottom of the fixed column 7 is further provided with a base plate 71, an elastic piece 72 is arranged between the base plate 71 and the switching plate 51 in a contact mode, the elastic piece 72 is a spring, one end of the spring is fixed on the base plate 71, and the other end of the spring is arranged in a contact mode with the switching plate 51.

In order to enhance the overall stability, in one embodiment, the second protrusions 53 are symmetrically arranged on the switching plate 51 in two sets, and two sets of sliding grooves 61 corresponding to the second protrusions 53 are arranged in the sleeve 6.

In order to better adjust the gear shift in an increasing and decreasing manner, in one embodiment, the sliding groove 61 includes a first inclined wall 611 and a second inclined wall 613 which are symmetrically arranged, the first inclined wall 611 and the second inclined wall 613 are connected by a connecting wall 612 at the top of the sleeve 6, the width of the connecting wall 612 is matched with the size of the second protrusion 53, and the second protrusion 53 can freely slide in the sliding groove 61.

In order to better maintain the overall stability, in one embodiment, the third protrusion 73 is provided with a tip portion near one end of the bottom plate 71, and the tip portion is an isosceles triangle tip portion. After the switching disk 51 rotates a certain angle, the second protrusion 53 of the switching disk 51 is restricted by the tip of the third protrusion 73 by the elastic member 72 and can be more stably restored to the corresponding groove.

In a specific operation process, the switching member 8 drives the sleeve 6 to rotate, and since the second protrusion 53 of the switching disk 51 is clamped in the sliding slot 61 of the sleeve 6, when the second protrusion 53 first passes through the first inclined wall 611 or the second inclined wall 613, the rotating arm 5 is integrally lowered, and similarly, the transmission mechanism 22 is also integrally lowered. At this time, the gear on the transmission mechanism 22 is disengaged from the gear of the drive gear 21 and the output mechanism 23 or the gear of the speed change mechanism; the first projection 52 in the switching disc 51 is also separated from the groove of the fixing column 7; as the sleeve 6 continues to rotate, the rotating arm 5 rotates synchronously, and the transmission mechanism 22 rotates around the input shaft 3; after the transmission mechanism 22 reaches the matching position of the next group of speed changing assemblies 24 or the matching position of the output mechanism 23, the driving of the sleeve 6 is stopped, at this time, the rotating arm 5 is lifted integrally due to the action of the elastic element 72, and then the gear on the transmission mechanism 22 is meshed with the driving gear 21 and the gear of the output mechanism 23 or the gear of the speed changing mechanism, so that the power output and speed changing can be continuously realized.

In order to drive the sleeve 6, in one embodiment, the switching member 8 may be a stepping motor, and the stepping motor is controlled to rotate and stop, so as to change the position of the transmission mechanism 22, and thus to realize different gear shifts.

Of course, in an embodiment, the sleeve 6 can be driven by the following manner, as shown in fig. 10, the switch member 8 includes a switch rod 81, one end of the switch rod 81 is provided with a bayonet, the other end of the switch rod 81 is connected with a rotating rod 82, the other end of the rotating rod 82 is fixed with a rotating shaft 83, the rotating rod 82 can rotate around the rotating shaft 83, the rotating shaft 83 is fixed on the transmission housing 1 through another bearing, one end of the rotating shaft 83 penetrates through the transmission housing 1, and the rotating rod 82 can rotate by rotating the rotating shaft 83; a first abutting head 811 and a second abutting head 812 are respectively arranged at two ends of the bayonet; the bottom of the sleeve 6 is uniformly provided with switching convex columns 62, the transmission case 1 is provided with an annular groove 11, and one end of the rotating rod 82, which is far away from the rotating shaft 83, is clamped in the annular groove 11; in the shift position switching state, the first abutting head 811 and the second abutting head 812 are kept in contact with the switching boss 62.

In the specific working process, the rotating shaft 83 is rotated to drive the rotating rod 82 to rotate, the rotating rod 82 drives the switching rod 81 to integrally move along the track of the annular groove 11, and in a moving period of the switching rod 81, the switching rod 81 toggles one switching convex column 62 to rotate by a fixed angle; in the next moving period of the switching rod 81, the switching rod 81 toggles the next switching convex column 62 to rotate by the same angle, thereby realizing the conversion between different gear shifts.

In order to better realize the smooth rotation of the input shaft 3, in one embodiment, a motor brush conducting device 9 is arranged at one end of the input shaft 3, which penetrates out of the transmission case 1, the motor brush conducting device 9 comprises a fixed stop piece 91 and a carbon brush fixed cover 92 arranged in the fixed stop piece 91, a sealing cover 93 is further arranged at one end of the carbon brush fixed cover 92, and an electric wire inlet is formed between the carbon brush fixed cover 92 and the sealing cover 93; the fixed retaining sheet 91 is fixed on the gearbox shell 1, a motor shaft is sleeved in the carbon brush fixed cover 92, one end of the motor shaft penetrates through the gearbox shell 1, a motor shaft nut 94 is arranged between the motor shaft and the gearbox shell 1 for limiting, and an electric brush axial fixing nut 95 is arranged above the motor shaft nut 94; two groups of through holes are further formed in the brush axial fixing nut 95 in a penetrating mode, two electric wires on a motor shaft respectively penetrate through the through holes, a carbon brush rotating shaft 96 is further arranged above the brush axial fixing nut 95, a rotating disc is arranged at the bottom of the carbon brush rotating shaft 96 and connected with the brush axial fixing nut 95, and the two electric wires respectively contact the positive pole and the negative pole of the rotating disc after penetrating through the through holes. A carbon brush shaft is arranged in the middle of the rotating disc, a fixed disc is sleeved outside the carbon brush shaft and is separated from the carbon brush shaft, carbon brushes 97 are respectively arranged above and below the fixed disc, the carbon brushes 97 are arranged in contact with the carbon brush shaft, and the carbon brushes 97 above the fixed disc are fixed on the sealing cover 93; two power supply wires are connected to the two sets of carbon brushes 97 through the wire inlets, so that a good and stable current loop is formed. The damage caused by winding of two power lines in the rotation process of the motor shaft is avoided. Through the motor brush conducting device who sets up like this, adopted brush contact material to conduct promptly to can ensure the continuous stable operation of input shaft 3.

The gearbox of the utility model is mainly designed for the two-wheeled electric vehicle with the motor and the wheel hub to change the speed, and the electric vehicle can have wide application market in the area needing high torque; the gearbox is not only applied to electric vehicles, but also can be used for other types of bicycles or other facility equipment with speed change requirements.

The present invention is not limited to the above-mentioned optional embodiments, and any other products in various forms can be obtained by anyone under the teaching of the present invention, and any changes in the shape or structure thereof, all the technical solutions falling within the scope of the present invention, are within the protection scope of the present invention.

Claims (10)

1. An electric motor car gearbox which characterized in that: the transmission comprises a transmission case (1), a speed change gear device (2), an input shaft (3) and an output shaft (4), wherein the input shaft (3) and the output shaft (4) are respectively fixed on the transmission case (1) through a first bearing seat and a second bearing seat; the speed change gear device (2) comprises a driving gear (21) sleeved on the input shaft (3), and a transmission mechanism (22), an output mechanism (23) and a speed change mechanism which are arranged on one side of the driving gear (21);

the transmission mechanism (22) comprises a switching rotating shaft, and a second gear (222) and a first gear (221) meshed with the driving gear (21) are coaxially arranged on the switching rotating shaft;

the output mechanism (23) comprises a third gear (231) and a fourth gear (232) which are arranged on the output shaft (4) in a layered mode, under the condition of normal output, the output mechanism (23), the switching rotating shaft and the input shaft (3) are positioned on the same straight line, and at the moment, the third gear (231) and the second gear (222) are arranged in a meshed mode;

the speed change mechanism comprises at least one group of speed change assemblies (24), each speed change assembly (24) comprises a speed change part (241) and a transmission piece (242) arranged on one side of the speed change part (241), each speed change part (241) comprises a gear rotating shaft (2414), each gear rotating shaft (2414) is fixed on the gearbox shell (1) through a third bearing seat, and a fifth gear (2411) and a sixth gear (2412) are coaxially arranged on each gear rotating shaft (2414); the transmission piece (242) comprises a transmission rotating shaft and a transmission gear arranged on the transmission rotating shaft, the transmission rotating shaft is fixed on the gearbox shell (1) through a fourth bearing seat, and the transmission gear is meshed with a fourth gear (232) and a sixth gear (2412) respectively;

under the condition that a plurality of groups of speed changing assemblies (24) are arranged, a transmission gear of any group of speed changing assemblies (24) is meshed with a sixth gear (2412) of the previous group of speed changing assemblies (24);

the gear ratio of the fifth gear (2411) to the sixth gear (2412) is not equal to 1;

in a gear switching state, the gear rotating shaft (2414), the switching rotating shaft and the input shaft (3) are positioned on the same straight line; at the moment, the fifth gear (2411) is meshed with the second gear (222);

a driving mechanism for driving the transmission mechanism (22) to rotate around the input shaft (3) is also arranged.

2. The electric vehicle transmission of claim 1, wherein: when multiple sets of speed change assemblies (24) are arranged, the gear ratio of the fifth gear (2411) and the sixth gear (2412) of any set of speed change assembly (24) is increased or decreased compared with the gear ratio of the fifth gear (2411) and the sixth gear (2412) of the last set of speed change assembly (24).

3. The electric vehicle transmission of claim 1, wherein: under the condition that a plurality of groups of speed change assemblies (24) are arranged, the speed change assemblies (24) further comprise seventh gears (2413) coaxially arranged on the gear rotating shafts (2414), the seventh gears (2413) of the groups of speed change assemblies (24) are meshed with the transmission gears of the previous group of speed change assemblies (24), and the sixth gears (2412) of the groups of speed change assemblies (24) are meshed with the transmission gears of the next group of speed change assemblies (24).

4. The electric vehicle transmission of claim 3, wherein: the gear ratio of the seventh gear (2413) to the sixth gear (2412) is not equal to 1.

5. An electric vehicle transmission according to any one of claims 1 to 4, characterized in that: the driving mechanism comprises a rotating arm (5), a sleeve (6) and a fixed column (7), wherein a seventh bearing seat is arranged at one end of the rotating arm (5) and is sleeved on a switching rotating shaft through the seventh bearing seat, a switching disc (51) is arranged at the other end of the rotating arm (5), the switching disc (51) is sleeved in the sleeve (6), a second protrusion (53) is arranged outside the switching disc (51), a sliding groove (61) matched with the second protrusion (53) is formed in the sleeve (6), the second protrusion (53) is embedded in the sliding groove (61), and a first inclined wall (611) is arranged on one side of the sliding groove (61);

a switching piece (8) for driving the sleeve (6) to rotate is also arranged;

the switching disc (51) is sleeved outside the fixed column (7), a plurality of groups of first bulges (52) are uniformly arranged in the switching disc (51) along the circumferential direction of the switching disc, a plurality of groups of third bulges (73) are uniformly arranged outside the fixed column (7) along the circumferential direction of the fixed column, a groove is arranged between every two adjacent groups of third bulges (73), and the groove is matched with the first bulges (52) in size; the bottom of the fixed column (7) is also provided with a chassis (71), and an elastic piece (72) is arranged between the chassis (71) and the switching disc (51).

6. The electric vehicle transmission of claim 5, wherein: two groups of second bulges (53) are symmetrically arranged on the switching disc (51), and two groups of sliding grooves (61) corresponding to the second bulges (53) are arranged in the sleeve (6).

7. The electric vehicle transmission of claim 5, wherein: the sliding groove (61) comprises a first inclined wall (611) and a second inclined wall (613) which are symmetrically arranged, the first inclined wall (611) and the second inclined wall (613) are connected through a connecting wall (612) at the top of the sleeve (6), and the width of the connecting wall (612) is matched with the size of the second protrusion (53).

8. The electric vehicle transmission of claim 5, wherein: one end of the third bulge (73) close to the chassis (71) is provided with a tip part which is an isosceles triangle tip part.

9. The electric vehicle transmission of claim 5, wherein: the switching piece (8) comprises a switching rod (81), one end of the switching rod (81) is provided with a bayonet, the other end of the switching rod (81) is connected with a rotating rod (82), the other end of the rotating rod (82) is provided with a rotating shaft (83), and the rotating rod (82) can rotate around the rotating shaft (83); a first abutting joint head (811) and a second abutting joint head (812) are respectively arranged at two ends of the bayonet; the bottom of the sleeve (6) is uniformly provided with switching convex columns (62), the gearbox shell (1) is provided with an annular groove (11), and one end of the rotating rod (82) far away from the rotating shaft (83) is clamped in the annular groove (11); in the gear shifting state, the first abutting head (811) and the second abutting head (812) keep contact with the shifting boss (62).

10. The electric vehicle transmission of claim 1, wherein: and one end of the input shaft (3) penetrating out of the gearbox shell (1) is provided with a motor brush conducting device (9).

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