An electric vehicle gearless overdrive two-speed transmission device and method of use

Abstract

The application discloses a two-gear shifting device without an idle gear for an electric vehicle and a use method, and the device comprises a fast-gear gear, a slow-gear gear, an overrunning gear and a synchronous ring body which is coaxially arranged on an output shaft and axially moves between the fast-gear gear and the overrunning gear; when the synchronous ring body moves, the fast-gear gear can be connected alone to perform a fast-gear action, the fast-gear gear and the overrunning gear can be connected simultaneously to perform an overrunning action, and the overrunning gear can be pressed alone to be connected with the slow-gear gear to perform a slow-gear action. The application has a simple and compact structure, can realize quick switching between the fast-gear and the slow-gear, avoid the delay and slow response phenomenon caused by the existence of an idle gear during the two-gear switching, and can perform a transition during the overrunning action in the frequent switching process, so that the gear shifting impact and the jerk feeling are reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of electric vehicle transmission, in particular to an electric vehicle without neutral gear, overrunning two-gear transmission device and use method. BACKGROUND

[0002] Electric vehicles use electricity as energy, driven by electric motors, with the advantages of simple structure, low maintenance cost, no tail gas emission and environmental protection, which can be used in public transportation, reserved transportation and other fields.

[0003] The transmission device is an important part of the electric vehicle, which can ensure the electric vehicle to travel at different speeds. For example, the transmission device configured for light logistics electric vehicles generally has fast gear, slow gear and neutral gear. The shift is achieved by manually or automatically driving the shift fork in the corresponding gear position.

[0004] When switching from fast gear to slow gear or from slow gear to fast gear, the traditional transmission device needs a neutral gear for transition. On the one hand, this method requires additional components, resulting in a relatively complex structure and high cost. On the other hand, the neutral gear transition during gear shifting may be delayed and slow to respond, and there may be gear shifting impact and jerk, especially in logistics transportation, where electric vehicles are frequently started and accelerated, which may reduce driving comfort and stability. SUMMARY

[0005] The present application aims to provide an electric vehicle without neutral gear, overrunning two-gear transmission device, which is simple in structure and compact, realizes fast switching between fast gear and slow gear, avoids the problem of delay and slow response when switching between two gears, and reduces gear shifting impact and jerk during frequent switching, thereby improving driving comfort and stability.

[0006] To achieve the above-mentioned purpose, the electric vehicle without neutral gear, overrunning two-gear transmission device, comprises: an output shaft rotatably installed in a transmission housing, and

[0007] Fast gear and slow gear are located on the output shaft and are driven to rotate in the same direction at different speeds.

[0008] The overrunning gear moves axially between the fast gear and the slow gear. The overrunning gear is separated from the slow gear by the elastic force towards the fast gear. After the overrunning gear is compressed by the elastic force, it can be connected to the slow gear for synchronous rotation.

[0009] The synchronous ring body rotates with the output shaft and is driven to move axially between the fast gear and the overrunning gear.

[0010] The synchronous ring body can be connected with the fast gear alone to perform fast shifting, connected with the fast gear and the overdrive gear to perform overdrive, and pressed against the overdrive gear alone to perform slow shifting.

[0011] In some examples of the present application, the slow gear shaft is axially limited on the output shaft, and the middle cylinder is connected with the overdrive gear through spline connection.

[0012] An elastic member is arranged between the slow gear and the overdrive gear, and the slow gear is subjected to elastic force towards the fast gear.

[0013] In some examples of the present application, the fast gear is provided with a second external spline or tooth on the side towards the synchronous ring body.

[0014] The end surface of the synchronous ring body towards the fast gear is provided with a second internal spline or tooth matched with the second external spline.

[0015] In some examples of the present application, the end surface of the synchronous ring body towards the overdrive gear is provided with a first tooth, and the overdrive gear is provided with a tooth groove on one side.

[0016] The first tooth is an axially protruding angular structure, and the circumferential surface of the angular structure is arranged at a right angle or an acute angle with the end surface of the synchronous ring body.

[0017] The shape of the tooth groove is consistent with the outline of the first tooth.

[0018] In some examples of the present application, a shaft sleeve is arranged between the synchronous ring body and the output shaft.

[0019] The two end surfaces of the shaft sleeve can be in contact with the end surfaces of the fast gear and the overdrive gear respectively, wherein the end of the fast gear away from the slow gear is limited by the shaft shoulder of the output shaft, and the end of the slow gear away from the fast gear is limited by the snap spring mounted on the output shaft.

[0020] When the synchronous ring body moves axially, the synchronous ring body is always connected with the shaft sleeve for transmission.

[0021] In some examples of the present application, the inner side of the shaft sleeve and the output shaft, and the outer side of the shaft sleeve and the synchronous ring body are connected with each other through spline.

[0022] In some examples of the present application, the outer circumferential side of the synchronous ring body is provided with an annular groove.

[0023] The fork in the fork member is connected with the annular groove and drives the synchronous ring body to move axially.

[0024] The application aims to provide a use method of the electric vehicle gearless overrunning two-gear transmission device.

[0025] The use method of the electric vehicle gearless overrunning two-gear transmission device specifically comprises the following steps.

[0026] S1, the fast gear and the slow gear are driven to rotate at different speeds and in the same direction;

[0027] S2, when the fast gear is output, the synchronization ring is axially moved to the limit position of the fast gear, the synchronization ring is completely connected with the fast gear for transmission and is completely separated from the overrunning gear, at this time, the fast gear drives the synchronization ring, and the synchronization ring drives the output shaft for power output;

[0028] S3, when the slow gear is output, the synchronization ring is axially moved to extrude the overrunning gear to make it axially move elastically, the synchronization ring is completely separated from the fast gear and is gradually or completely connected with the overrunning gear for one-way transmission, at this time, the slow gear drives the synchronization ring through the overrunning gear, and the synchronization ring drives the output shaft for power output;

[0029] S4, during the process that the synchronization ring is axially moved to extrude the overrunning gear from the limit position of the fast gear, the synchronization ring is gradually separated from the fast gear and is gradually connected with the overrunning gear for one-way transmission, at this time, the fast gear can drive the synchronization ring to reversely rotate relative to the overrunning gear, so that the overrunning gear cannot output power with the synchronization ring, the overrunning action and the switching transition between the fast gear and the slow gear are completed.

[0030] Compared with the prior art, the electric vehicle gearless overrunning two-gear transmission device can realize two-gear switching and overrunning action of the fast gear and the slow gear through the axial movement of the synchronization ring between the fast gear and the overrunning gear, the overall structure is simple and compact, during the overrunning action, the synchronization ring is gradually separated from the fast gear and is gradually connected with the overrunning gear for one-way transmission, direct switching between the fast gear and the slow gear is realized, the phenomenon of delay and slow response due to the existence of the idle gear during two-gear switching is avoided, and during frequent switching, the overrunning action can be transitioned, gear shifting impact and jerk are reduced, and the driving comfort and stability are improved.

[0031] The shaft sleeve is arranged between the fast gear and the overrunning gear, the synchronizing ring body is always connected with the shaft sleeve for transmission, the shaft sleeve can ensure that the synchronizing ring body is connected with the fast gear and the overrunning gear for transmission under the power output, and the two end faces of the shaft sleeve can be in contact with the end faces of the fast gear and the overrunning gear, so that the shaft sleeve can limit the fast gear and the overrunning gear. BRIEF DESCRIPTION OF DRAWINGS

[0032] Figure 1 It is a schematic diagram of the overall structure of the present application.

[0033] Figure 2 It is an exploded schematic diagram of the overall structure of the present application.

[0034] Figure 3 It is a front view of the overall structure of the present application (the fast gear and the slow gear are cut in section).

[0035] Figure 4 It is an exploded schematic diagram of the structure among the synchronizing ring body, the shaft sleeve and the overrunning gear in the present application.

[0036] Figure 5 It is an exploded schematic diagram of the structure among the overrunning gear, the elastic member and the slow gear in the present application.

[0037] In the figure: 10, output shaft, 11, first external spline, 12, snap spring.

[0038] 20, fast gear, 21, second external spline.

[0039] 30, slow gear.

[0040] 40, synchronizing ring body, 41, second internal spline, 42, first tooth.

[0041] 50, shaft sleeve, 51, third external spline, 52, first internal spline.

[0042] 60, overrunning gear, 61, tooth groove.

[0043] 70, elastic member. DETAILED DESCRIPTION

[0044] In order to make the purpose, technical scheme and advantages of the technical scheme of the present application more clear, the technical scheme of the embodiments of the present application will be described clearly and completely in the following with reference to the drawings of the embodiments of the present application. The same reference signs in the drawings represent the same parts. It should be noted that the described embodiments are part of the embodiments of the present application, not all the embodiments. Based on the described embodiments of the present application, all other embodiments obtained by those skilled in the art without creative labor belong to the scope of protection of the present application.

[0045] Unless otherwise defined, technical terms or scientific terms used herein shall have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terms "first", "second", and similar terms, used herein do not necessarily have any order or sequence or importance, but are used to distinguish one element from another. Also, the terms "a" or "an", used herein do not necessarily mean "one", but are used to indicate "at least one". The terms "including", "comprising", and similar terms used herein are used to mean that the elements or objects listed after the term encompass the elements or objects recited before the term, and equivalents thereof, without precluding other elements or objects. The terms "connected" or "coupled" and similar terms used herein do not necessarily mean that the elements or objects are physically or mechanically connected or coupled, but can include electrical connection or coupling, whether direct or indirect. The terms "upper", "lower", "left", "right", and similar terms are used herein only to indicate relative positions, and when the absolute positions of the described objects are changed, the relative positions can also be changed accordingly.

[0046] As shown in Figure 1 , Figure 2 , Figure 3 , the electric vehicle without gear, overrunning two-gear transmission device, comprising: a rotatingly installed in the transmission housing output shaft 10, and

[0047] Fast gear 20, slow gear 30, located on the output shaft 10 and driven to rotate at different speeds in the same direction;

[0048] Overrunning gear 60, axially moving between fast gear 20, slow gear 30, overrunning gear 60 is separated from slow gear 30 by the elastic force towards fast gear 20, overrunning gear 60 can be connected with slow gear 30 to rotate in the same direction after compression of the elastic force;

[0049] Synchronous ring body 40, rotating with the output shaft 10, and driven to move axially without gear between fast gear 20 and overrunning gear 60;

[0050] Wherein, the synchronous ring body 40 can be connected with fast gear 20 alone to perform fast gear action, connected with fast gear 20 and overrunning gear 60 to perform overrunning action, and pressed against overrunning gear 60 alone to make it connected with slow gear 30 to perform slow gear action when moving.

[0051] Specifically, the output shaft 10 can be installed in the transmission housing through a bearing to perform power output;

[0052] Fast gear 20, slow gear 30, configured to be connected with power input components to rotate at different speeds in the same direction, such as fast gear 20 having fewer teeth on the circumference than slow gear 30, which is explained, Figures 1 to 3The outer teeth of the fast gear 20 and the slow gear 30 are not drawn, and the input component can include an input shaft and two gears with different numbers of teeth on the input shaft, which are connected to the fast gear 20 and the slow gear 30; the fast gear 20 and the slow gear 30 are rotatably installed on the output shaft 10 through bearings;

[0053] The overrunning gear 60 is located between the fast gear 20 and the slow gear 30, can be sleeved on the output shaft 10 without rotating with the output shaft 10, and can be axially moved to adjust the connection with the slow gear 30 through circumferential limiting after compression of the elastic force, so that the overrunning gear 60 rotates unidirectionally and the synchronizing ring body 40 extrudes and contacts the overrunning gear 60 to completely connect and drive unidirectionally;

[0054] The synchronizing ring body 40 can transmit power to the output shaft 10 and move without a gap between the fast gear 20 and the overrunning gear 60, which means that the synchronizing ring body 40 always rotates with the output shaft 10 during movement, and is in three node states with the fast gear 20, the overrunning gear 60, and the slow gear 30, i.e., the synchronizing ring body 40 moves alone with the fast gear 20 to perform a fast gear action, simultaneously with the fast gear 20 and the overrunning gear 60, and alone extrudes and connects the overrunning gear 60;

[0055] When the synchronizing ring body 40 moves to the limit position of the fast gear 20, the synchronizing ring body 40 is completely connected with the fast gear 20 to rotate together, at this time the synchronizing ring body 40 is completely separated from the overrunning gear 60, and the fast gear action of the variable speed device is completed; when the synchronizing ring body 40 moves from the limit position of the fast gear 20 to the overrunning gear 60, during this process, the synchronizing ring body 40 gradually separates from the fast gear 20, and the synchronizing ring body 40 gradually connects with the overrunning gear 60 to drive unidirectionally, and the overrunning action of the variable speed device is completed; when the synchronizing ring body 40 moves to extrude the overrunning gear 60 to move axially, the synchronizing ring body 40 is completely separated from the fast gear 20, at this time the synchronizing ring body 40 is connected with the slow gear 30 through the overrunning gear 60, and the slow gear action of the variable speed device is completed;

[0056] The two-gear variable speed device without a gap and overrunning for an electric vehicle is used, and the fast gear 20 and the slow gear 30 are driven to rotate in the same direction at different speeds through the input component;

[0057] When the fast gear output is performed, the shift fork member can drive the synchronizer ring body 40 to move axially. For the convenience of description, the fast gear 20 is located on the left side and the slow gear 30 is located on the right side. When moving close to the limit position on the left side, the synchronizer ring body 40 is completely connected with the fast gear 20 for transmission. At this time, the fast gear 20 drives the synchronizer ring body 40 and the output shaft 10 to perform power output. The synchronizer ring body 40 is completely separated from the overrunning gear 60. The slow gear 30 rotates with the overrunning gear 60, but cannot act on the output shaft 10 through the synchronizer ring body 40 to perform power output. In this state, the input member can be reversed to realize the reverse gear action through the fast gear 20, the synchronizer ring body 40 and the output shaft 10.

[0058] When the slow gear output is performed, the shift fork member drives the synchronizer ring body 40 to move to the right and press the overrunning gear 60 to make the overrunning gear 60 move axially elastically. The synchronizer ring body 40 is completely separated from the fast gear 20 and gradually or completely connected with the overrunning gear 60 for one-way rotation. At this time, the slow gear 30 drives the overrunning gear 60 and the synchronizer ring body 40, and the output shaft 10 performs power output. The synchronizer ring body 40 is completely separated from the fast gear 20, and the fast gear 20 cannot act on the output shaft 10 through the synchronizer ring body 40 to perform power output. It is explained that the one-way rotation means that there is relative rotation between the synchronizer ring body 40 and the slow gear 30. When the slow gear 30 rotates forward relative to the synchronizer ring body 40, it can drive the synchronizer ring body 40 to rotate in the same direction. When the slow gear 30 rotates reversely relative to the synchronizer ring body 40, it cannot perform power transmission.

[0059] During the movement of the synchronizer ring body 40 from the limit position of the fast gear 20 to the right, the synchronizer ring body 40 gradually separates from the fast gear 20 and gradually connects with the overrunning gear 60. In this state, the synchronizer ring body 40 is connected with the fast gear 20 and the slow gear 30. Since the rotating speed of the fast gear 20 relative to the synchronizer ring body 40 is greater than that of the slow gear 30 relative to the synchronizer ring body 40 through the overrunning gear 60, the fast gear 20 can drive the synchronizer ring body 40 to rotate reversely relative to the overrunning gear 60, that is, the overrunning gear 60 cannot perform power output with the synchronizer ring body 40, and the overrunning action is completed. The variable speed device still operates in the fast gear and is directly switched to the slow gear. Conversely, during the movement of the synchronizer ring body 40 from the complete connection with the overrunning gear 60 to the left, the overrunning action is also performed to transition, and the variable speed device is directly switched from the slow gear to the fast gear.

[0060] The electric vehicle without neutral gear and overrunning two-gear transmission device moves the synchronous ring body 40 between the fast gear 20 and the overrunning gear 60 in the axial direction, has a simple and compact overall structure, realizes two-gear transmission of fast gear and slow gear and overrunning action, in the overrunning action process, the synchronous ring body 40 gradually separates from the fast gear 20, and the synchronous ring body 40 gradually connects with the overrunning gear 60 to realize one-way transmission, avoids the delay and slow response phenomenon caused by the existence of neutral gear during two-gear switching, and in the frequent switching process, the overrunning action can be transitioned, the gear shifting impact and jerk feeling are reduced, and the driving comfort and stability are improved; in addition, the electric vehicle without neutral gear and overrunning two-gear transmission device can be applied to two-gear automatic transmission in the electric vehicle, that is, the synchronous ring body 40 is connected with the actuator, when the electric vehicle needs different power output ends, the control system controls the actuator to act on the synchronous ring body 40 to realize the axial gear shifting operation, so as to change the speed ratio and realize power output, for example, when the electric vehicle needs to output large torque at low speed, the synchronous ring body 40 is switched to the slow gear, and when the electric vehicle needs to output small torque at high speed, the synchronous ring body 40 is switched to the fast gear, so as to realize two-gear automatic transmission.

[0061] In some examples of the present application, as shown in Figure 5 The slow gear 30 is axially limited on the output shaft 10, and the overrunning gear 60 is connected through the spline;

[0062] The elastic member 70 is arranged between the slow gear 30 and the overrunning gear 60, and the slow gear 30 is subjected to the elastic force towards the fast gear 20;

[0063] Specifically, the slow gear 30 is sleeved on the output shaft 10 and axially limited, and the overrunning gear 60 is connected through the spline; the spline connection can ensure that the overrunning gear 60 and the slow gear 30 rotate together and move axially;

[0064] The elastic member 70 is arranged between the slow gear 30 and the overrunning gear 60, for example, a cylindrical spring is sleeved, and the two ends of the spring are in contact with the slow gear 30 and the overrunning gear 60 respectively; when the overrunning action is performed, the fast gear 20 can drive the synchronous ring body 40 to rotate in the opposite direction relative to the overrunning gear 60, at this time, the overrunning gear 60 is subjected to extrusion and can be elastically offset to prevent power output.

[0065] In some examples of the present application, as shown in Figure 2 , Figure 4 The side of the fast gear 20 towards the synchronous ring body 40 is provided with the second external spline 21;

[0066] The end face of the synchronous ring body 40 towards the fast gear 20 is provided with the second internal spline 41 matched with the second external spline 21;

[0067] Specifically, as shown in Figure 2As shown, the right end surface of the fast gear 20 is provided with a second external spline 21, and the left end surface of the synchronous ring body 40 is provided with a second internal spline 41 matched with the second external spline 21. When the fast action is performed, the synchronous ring body 40 moves to the limit position close to the fast gear 20, at which time the synchronous ring body 40 and the fast gear 20 are connected by the spline mode, thereby ensuring the power output.

[0068] In some examples of the present application, as shown in Figure 4 As shown, the end surface of the synchronous ring body 40 towards the over gear 60 is provided with a first tooth 42, and the over gear 60 is provided with a tooth groove 61 on one end side;

[0069] The first tooth 42 is an axially protruding angular structure, and the circumferential surface of the angle is arranged at a right angle or an acute angle with the end surface of the synchronous ring body 40;

[0070] The shape of the tooth groove 61 is consistent with the external profile of the first tooth 42;

[0071] Specifically, when the synchronous ring body 40 rotates forward relative to the slow gear 30, the first tooth 42 can match the tooth groove 61 through the right angle or acute angle end, so that the over gear 60 and the synchronous ring body 40 are engaged for one-way transmission. When the synchronous ring body 40 rotates reversely relative to the slow gear 30, the first tooth 42 and the tooth groove 61 can be staggered with the longest side as the acting surface. When staggered, the over gear 60 compresses the elastic member 70;

[0072] Or the end side of the over gear 60 is provided with a second tooth, and the end side of the synchronous ring body 40 is provided with a tooth groove 61 matched with the second tooth;

[0073] When the synchronous ring body 40 moves and is connected with the fast gear 20 and the over gear 60, since the rotation speed of the fast gear 20 relative to the synchronous ring body 40 is greater than the rotation speed of the slow gear 30 relative to the synchronous ring body 40 through the over gear 60, the fast gear 20 can drive the synchronous ring body 40 to rotate reversely relative to the over gear 60. In the present example, the first tooth 42 and the tooth groove 61 can be staggered with the longest side as the acting surface. The over gear 60 cannot output power with the synchronous ring body 40 through one-way transmission, and the over action is completed.

[0074] In some examples of the present application, as shown in Figure 2 、 Figure 4 As shown, the synchronous ring body 40 and the output shaft 10 are provided with a shaft sleeve 50;

[0075] The two end surfaces of the shaft sleeve 50 can respectively contact the end surfaces of the fast gear 20 and the over gear 60;

[0076] Wherein, the end of the fast gear 20 away from the slow gear 30 is limited by the shaft shoulder of the output shaft 10, and the end of the slow gear 30 away from the fast gear 20 is limited by the snap spring 12 installed on the output shaft 10;

[0077] When the synchronous ring body 40 moves axially, the synchronous ring body 40 is always connected and driven by the shaft sleeve 50;

[0078] Specifically, when the synchronous ring body 40 moves axially, the synchronous ring body 40 is always connected and driven by the shaft sleeve 50; when the synchronous ring body 40 moves to the limit position close to the fast gear 20, the overrunning gear 60 is limited by the elastic force through the contact with the shaft sleeve 50, so that the shaft sleeve 50 can limit the fast gear 20 and the overrunning gear 60;

[0079] In the example, the shaft sleeve 50 is arranged between the fast gear 20 and the overrunning gear 60, and the synchronous ring body 40 is always connected and driven by the shaft sleeve 50, so that the shaft sleeve 50 can ensure that the synchronous ring body 40 can be flexibly connected and driven by the fast gear 20 and the overrunning gear 60 under the power output, and the two end faces of the shaft sleeve can be in contact with the end faces of the fast gear and the overrunning gear, so as to limit the fast gear and the overrunning gear by the shaft sleeve.

[0080] In some examples of the present application, as shown in the figure, the inner side of the shaft sleeve 50 is connected with the output shaft 10 by spline, and the outer side is connected with the synchronous ring body 40 by spline. Figure 4

[0081] Specifically, the inner side of the shaft sleeve 50 is provided with the first inner spline 52 and matched with the outer spline on the output shaft 10, and the outer side is provided with the third outer spline 51 and matched with the second inner spline 41 of the synchronous ring body 40.

[0082] The inner and outer sides of the shaft sleeve 50 are connected with the output shaft 10 and the synchronous ring body 40 by spline, so that the connection force is more uniform, the stress concentration is reduced, and the bearing capacity and stability are higher.

[0083] In some examples of the present application, the outer periphery of the synchronous ring body 40 is provided with an annular groove.

[0084] The fork in the fork member is connected with the annular groove and drives the synchronous ring body 40 to move axially.

[0085] The use of the electric vehicle without neutral gear and overrunning two-gear transmission device specifically includes the following steps:

[0086] S1, the fast gear 20 and the slow gear 30 are driven to rotate at different speeds and in the same direction;

[0087] ​S2, when the fast gear output is performed, the synchronous ring body 40 is axially moved close to the limit position of the fast gear 20, the synchronous ring body 40 is completely connected with the fast gear 20 for transmission, and is completely separated from the overrunning gear 60, at this time, the fast gear 20 drives the synchronous ring body 40, and the synchronous ring body 40 drives the output shaft 10 to output power;

[0088] S3, when the slow gear output is performed, the synchronous ring body 40 is axially moved to press the overrunning gear 60 to make it axially move elastically, the synchronous ring body 40 is completely separated from the fast gear 20 and is gradually or completely connected with the overrunning gear 60 for one-way transmission, at this time, the slow gear 30 drives the synchronous ring body 40 through the overrunning gear 60, and the synchronous ring body 40 drives the output shaft 10 to output power;

[0089] S4, in the process that the synchronous ring body 40 is axially moved to press the overrunning gear 60 from the limit position of the fast gear 20, the synchronous ring body 40 is gradually separated from the fast gear 20 and is gradually connected with the overrunning gear 60 for one-way transmission, in this state

[0090] At this time, the rotating speed of the fast gear 20 relative to the synchronous ring body 40 is greater than the rotating speed of the slow gear 30 relative to the synchronous ring body 40 through the overrunning gear 60, the fast gear 20 can drive the synchronous ring body 40 to rotate reversely relative to the overrunning gear 60, so that the overrunning gear 60 cannot output power with the synchronous ring body 40, the overrunning action and the switching transition between the fast gear and the slow gear are completed.

[0091] The above describes in detail the exemplary embodiment of the electric vehicle gearless overrunning two-gear transmission device according to the present application with reference to the preferred embodiment, however, those skilled in the art can understand that various modifications and improvements can be made to the above specific embodiment without departing from the concept of the present application, and various technical features and structures according to the present application can be combined without departing from the protection scope of the present application, the protection scope of the present application is determined by the appended claims.

Claims

1. A two-speed overrunning transmission for an electric vehicle without neutral gear, characterized in that: include: An output shaft (10) is rotatably mounted in the transmission housing, and A fast gear (20) and a slow gear (30) are located on the output shaft (10) and are driven to rotate in the same direction but at different speeds; The overrunning gear (60) moves axially between the fast gear (20) and the slow gear (30), the overrunning gear (60) is subjected to an elastic force toward the fast gear (20) and is separated from the slow gear (30), and after the overrunning gear (60) compresses the elastic force, it can be connected with the slow gear (30) and rotate simultaneously; A synchronizer ring body (40) rotates with the output shaft (10) and is driven to move axially without neutral between the fast gear (20) and the overrunning gear (60); When the synchronizer ring body (40) moves, it can be connected to the fast gear (20) alone to perform a fast gear action, connected to the fast gear (20) and the overrunning gear (60) at the same time to perform an overrunning action, and squeeze the overrunning gear (60) alone to connect it to the slow gear (30) to perform a slow gear action; The cylinder in the middle of the slow gear (30) is a spline structure and can be matched and connected with the overrunning gear (60) for simultaneous rotation; An elastic member (70) is provided between the slow gear (30) and the overrunning gear (60); The fast gear (20) is provided with a second external spline (21) or external teeth on a side facing the synchronizer ring body (40); The end surface of the synchronizer ring body (40) facing the fast gear (20) is provided with a second internal spline (41) or internal tooth matched with the second external spline (21); A shaft sleeve (50) is provided between the synchronizer ring body (40) and the output shaft (10); The two end surfaces of the shaft sleeve (50) can respectively contact the end surfaces of the fast gear (20) and the overrunning gear (60); The end of the fast gear (20) away from the slow gear (30) is limited by a shaft shoulder of the output shaft (10), and the end of the slow gear (30) away from the fast gear (20) is limited by a retaining spring (12) installed on the output shaft (10); When the synchronizer ring body (40) moves axially, the synchronizer ring body (40) is always connected to the shaft sleeve (50) for transmission.

2. The electric vehicle non-neutral, overrunning two-speed transmission device according to claim 1, characterized in that: The end surface of the synchronization ring body (40) facing the overtaking gear (60) is provided with a first tooth (42), and one end side of the overtaking gear (60) is provided with a tooth groove (61); The first tooth (42) is an axially protruding angular structure, and the circumferential surface of the angular structure is arranged at a right angle or an acute angle to the end surface of the synchronization ring body (40); The shape of the tooth groove (61) is consistent with the outer contour of the first tooth (42).

3. The electric vehicle non-neutral, overrunning two-speed transmission according to claim 1, characterized in that: The inner side of the shaft sleeve (50) and the output shaft (10), as well as the outer side of the shaft sleeve (50) and the synchronizer ring body (40) are connected to each other via splines.

4. The electric vehicle non-neutral, overrunning two-speed transmission according to claim 1, characterized in that: An annular groove is provided on the outer peripheral side of the synchronization ring body (40); The shift fork in the shift fork component is connected to the annular groove and drives the synchronizer ring body (40) to move axially.

5. A method for using the neutral-free, overrunning two-speed transmission device for an electric vehicle according to claim 1, characterized in that: The specific steps include: S1, the fast gear (20) and the slow gear (30) are driven to rotate at different speeds and in the same direction; S2, when the fast gear is output, the synchronizer ring body (40) moves axially close to the limit position of the fast gear (20), the synchronizer ring body (40) is completely connected with the fast gear (20) for transmission, and is completely separated from the overrunning gear (60), at this time the fast gear (20) drives the synchronizer ring body (40), and the synchronizer ring body (40) drives the output shaft (10) for power output; S3, when the slow gear output is performed, the synchronizing ring body (40) moves axially to squeeze the overrunning gear (60) to make it move axially elastically, and the synchronizing ring body (40) is completely separated from the fast gear (20) and gradually or completely connected to the overrunning gear (60) for one-way transmission. At this time, the slow gear (30) drives the synchronizing ring body (40) through the overrunning gear (60), and the synchronizing ring body (40) drives the output shaft (10) to output power; S4, in the process of the synchronizing ring body (40) moving axially from the extreme position of the fast gear (20) to squeeze the overrunning gear (60), the synchronizing ring body (40) is gradually separated from the fast gear (20), and the synchronizing ring body (40) is gradually connected to the overrunning gear (60) for one-way transmission. At this time, the fast gear (20) can drive the synchronizing ring body (40) to rotate in the opposite direction relative to the overrunning gear (60), so that the overrunning gear (60) cannot output power with the synchronizing ring body (40), completing the overrunning action and the switching transition between the fast gear and the slow gear.

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