Neutral-gear-free overrunning type two-gear speed changing device of electric vehicle and using method

Abstract

The invention discloses a neutral-gear-free overrunning type two-gear speed changing device of an electric vehicle and a using method. The device comprises a high-gear gear, a low-gear gear and an overrunning gear which are coaxially located on an output shaft, and a synchronous ring body axially moving between the high-gear gear and the overrunning gear. When moving, the synchronous ring body can be independently connected with the high-gear gear to perform high-gear action, is simultaneously connected with the high-gear gear and the overrunning gear to perform overrunning action, and independently extrudes the overrunning gear to enable the overrunning gear to be connected with the slow-gear gear to perform slow-gear action. The gear shifting mechanism is simple and compact in structure, fast shifting between a fast gear and a slow gear is achieved, the phenomena of delay and slow response caused by the existence of a neutral gear during shifting of the two gears are avoided, in the frequent shifting process, the overrunning action can be transited, and the gear shifting impact and pause feeling are reduced.

Description

Technical Field

[0001] The present invention relates to the field of electric vehicle transmissions, and in particular to a neutral-free, overrunning two-speed transmission device for electric vehicles and a use method thereof. Background Art

[0002] Electric vehicles use electricity as energy and are driven by motors. They have the advantages of simple structure, low maintenance cost, no exhaust emissions and environmental protection. They can be used in public transportation, reserved transportation and other fields;

[0003] The transmission is an important part of an electric vehicle, which can ensure that the electric vehicle can travel at different speeds. Taking the transmission configured for a light logistics electric vehicle as an example, the gears of the transmission can generally be divided into fast gear, slow gear and neutral gear. The gear shifting is achieved by manually or automatically driving the shift fork to adjust to the corresponding gear.

[0004] When switching from a fast gear to a slow gear, or vice versa, a traditional transmission requires a neutral gear for transition. On the one hand, this method requires the transmission to be equipped with additional components, resulting in a relatively complex structure and high cost. On the other hand, there will be a delay and slow response in the neutral gear transition when shifting gears, and there will be gear shift shock and frustration. Especially in logistics transportation, electric vehicles frequently start, stop and accelerate, which can easily reduce driving comfort and stability. Summary of the invention

[0005] The object of the present invention is to provide an electric vehicle with a neutral-free, overriding two-speed transmission device, which has a simple and compact structure and can realize rapid switching between fast gears and slow gears, thereby avoiding the problems of delay and slow response caused by the existence of a neutral gear when switching between two gears. In addition, during frequent switching, the overriding action can be used to transition, which can reduce the gear shifting shock and frustration, thereby improving driving comfort and stability.

[0006] To achieve the above object, the present invention provides an electric vehicle non-neutral, overrunning two-speed transmission device, comprising: an output shaft rotatably mounted in a transmission housing, and

[0007] The fast gear and the slow gear are located on the output shaft and are driven to rotate in the same direction but at different speeds;

[0008] The overrunning gear moves axially between the fast gear and the slow gear. The overrunning gear is subjected to an elastic force toward the fast gear and is separated from the slow gear. After the overrunning gear compresses the elastic force, it can be connected with the slow gear to rotate simultaneously.

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

[0010] When the synchronizer ring moves, it can connect with the fast gear alone to perform a fast gear action, connect with the fast gear and the overrunning gear at the same time to perform an overrunning action, and squeeze the overrunning gear alone to connect it with the slow gear to perform a slow gear action.

[0011] In some examples of the present invention, the slow gear is axially limited on the output shaft, and the cylinder in the middle is connected to the overrunning gear through a spline;

[0012] An elastic member is arranged between the slow gear and the overrunning gear, and the slow gear is subjected to an elastic force toward the fast gear.

[0013] In some examples of the present invention, the fast gear is provided with a second external spline or external teeth on a side facing the synchronizer ring body;

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

[0015] In some examples of the present invention, the end surface of the synchronizing ring body facing the overrunning gear is provided with a first tooth, and one end side of the overrunning gear is provided with a tooth groove;

[0016] The first tooth 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 synchronizing ring body;

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

[0018] In some examples of the present invention, a sleeve is provided between the synchronizing ring body and the output shaft;

[0019] The two end faces of the sleeve can contact the end faces of the fast gear and the overrunning gear respectively; wherein the end of the fast gear away from the slow gear is limited by the shoulder of the output shaft, and the end of the slow gear away from the fast gear is limited by the retaining spring installed on the output shaft;

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

[0021] In some examples of the present invention, the inner side of the sleeve and the output shaft, as well as the outer side of the sleeve and the synchronizer ring body are connected to each other via splines.

[0022] In some examples of the present invention, an annular groove is provided on the outer peripheral side of the synchronizing ring body;

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

[0024] The present invention also aims to provide a method for using a two-speed transmission device with no neutral gear and overrunning type for an electric vehicle, wherein a two-speed shifting between a fast gear and a slow gear and an overrunning action are realized by axially moving a synchronizer ring body between a fast gear and an overrunning gear. During the overrunning action, the synchronizer ring body is gradually separated from the fast gear, and the synchronizer ring body is gradually connected to the overrunning gear for one-way transmission, thereby realizing direct switching between the fast gear and the slow gear, and avoiding delays and slow responses caused by the presence of a neutral gear when switching between the two gears.

[0025] A method for using a non-neutral, overrunning two-speed transmission device for an electric vehicle, specifically comprising 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 synchronizer ring body moves axially close to the limit position of the fast gear, the synchronizer ring body is fully connected with the fast gear for transmission and is completely separated from the overrunning gear. At this time, the fast gear drives the synchronizer ring body, and the synchronizer ring body drives the output shaft for power output;

[0028] S3, when the slow gear is output, the synchronizer ring body moves axially to squeeze the overrunning gear to make it move axially elastically, the synchronizer ring body is completely separated from the fast gear, and is gradually or completely connected with the overrunning gear to perform one-way transmission. At this time, the slow gear drives the synchronizer ring body through the overrunning gear, and the synchronizer ring body drives the output shaft to output power;

[0029] S4, when the synchronizer ring body moves axially from the extreme position of the fast gear to squeeze the overrunning gear, the synchronizer ring body gradually separates from the fast gear, and gradually connects with the overrunning gear for one-way transmission. At this time, the fast gear can drive the synchronizer ring body to rotate in the opposite direction relative to the overrunning gear, so that the overrunning gear cannot output power to the synchronizer ring body, completing the overrunning action and the switching transition between the fast gear and the slow gear.

[0030] Compared with the prior art, the present invention realizes the two-speed shifting between the fast gear and the slow gear and the overrunning action by axially moving the synchronizer ring body between the fast gear and the overrunning gear. The overall structure is simple and compact. During the overrunning action, the synchronizer ring body is gradually separated from the fast gear and gradually connected to the overrunning gear for one-way transmission, thereby realizing the direct switching between the fast gear and the slow gear, thus avoiding the delay and slow response caused by the existence of a neutral gear during the two-speed switching. In addition, during the frequent switching, the overrunning action can be transitioned, thereby reducing the impact and frustration of the gear shifting, and improving the driving comfort and stability.

[0031] Since a shaft sleeve is provided between the fast gear and the overrunning gear, and the synchronizer ring body is always connected to the shaft sleeve for transmission, the shaft sleeve can ensure that when power is output, the synchronizer ring body can be flexibly connected to the fast gear and the overrunning gear for transmission, and the two end faces of the shaft sleeve can respectively contact 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 THE DRAWINGS

[0032] Figure 1 It is a schematic diagram of the overall structure of the present invention;

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

[0034] Figure 3 This is a front view of the overall structure of the present invention (a cross section of the fast gear and the slow gear);

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

[0036] Figure 5 It is a schematic diagram of the explosion of the structure between the overrunning gear, the elastic member and the slow gear in the present invention;

[0037] In the figure: 10, output shaft, 11, first external spline, 12, retaining ring;

[0038] 20. Fast gear, 21. Second external spline;

[0039] 30. Slow gear;

[0040] 40. Synchronous ring body, 41. Second internal spline, 42. First tooth;

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

[0042] 60, overtaking gear, 61, tooth groove;

[0043] 70. Elastic parts. DETAILED DESCRIPTION

[0044] In order to make the purpose, technical solution and advantages of the technical solution of the present invention clearer, the technical solution of the embodiment of the present invention will be clearly and completely described in conjunction with the drawings of specific embodiments of the present invention. The same figure marks in the drawings represent the same parts. It should be noted that the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the described embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0045] Unless otherwise defined, the technical terms or scientific terms used herein shall have the usual meanings understood by persons of ordinary skill in the field to which the present invention belongs. The words "first", "second" and similar words used in the patent application specification and claims of the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, words such as "one" or "one" do not necessarily indicate a quantity limitation. Words such as "include" or "comprise" mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Words such as "connect" or "connected" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0046] like Figure 1 , Figure 2 , Figure 3 As shown, the present invention is an electric vehicle non-neutral, overrunning two-speed transmission device, comprising: an output shaft 10 rotatably mounted in a transmission housing, and

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

[0048] 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. After the overrunning gear 60 compresses the elastic force, it can be connected with the slow gear 30 to rotate simultaneously.

[0049] The synchronizer ring body 40 rotates with the output shaft 10 and is driven to move axially between the fast gear 20 and the overrunning gear 60 without neutral gear;

[0050] When the synchronizer ring body 40 moves, it can be connected to the fast gear 20 alone for fast gear action, connected to the fast gear 20 and the overrunning gear 60 at the same time for overrunning action, and squeeze the overrunning gear 60 alone to connect it to the slow gear 30 for slow gear action.

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

[0052] The fast gear 20 and the slow gear 30 are configured to be connected to the power input component to rotate in the same direction but at different speeds. For example, the number of teeth on the side of the fast gear 20 is less than the number of teeth on the side of the slow gear 30. Figures 1 to 3The outer teeth of the fast gear 20 and the slow gear 30 are not drawn. The input component may include an input shaft and two gears with different numbers of teeth on the input shaft. The two gears are connected to the fast gear 20 and the slow gear 30 respectively. The fast gear 20 and the slow gear 30 are rotatably mounted on the output shaft 10 through bearings.

[0053] The overrunning gear 60 is located between the fast gear 20 and the slow gear 30, and can be mounted on the output shaft 10 without rotating with the output shaft 10. After the elastic force is compressed, the overrunning gear 60 can be axially moved and adjusted, and rotate with the slow gear 30 through circumferential limit. This adjustment can facilitate the one-way rotation of the overrunning gear 60, and make the synchronizer ring body 40 squeeze and contact the overrunning gear 60, so as to be fully connected for one-way transmission;

[0054] The synchronizer ring body 40 can transmit power to the output shaft 10, and move between the fast gear 20 and the overrunning gear 60 without neutral gear. The non-neutral gear means that the synchronizer ring body 40 always rotates with the output shaft 10 during the movement, and is in three node states with the fast gear 20, the overrunning gear 60, and the slow gear 30, that is, the synchronizer ring body 40 moves to connect with the fast gear 20 alone for fast gear action, connect with the fast gear 20 and the overrunning gear 60 at the same time, and squeeze the overrunning gear 60 alone;

[0055] When the synchronizer ring body 40 moves close to the limit position of the fast gear 20, the synchronizer ring body 40 is completely connected with the fast gear 20 for co-rotation, and at this time the synchronizer ring body 40 is completely separated from the overrunning gear 60, completing the fast gear action of the speed change device; when the synchronizer ring body 40 gradually moves from the limit position of the fast gear 20 toward the overrunning gear 60, during this process, the synchronizer ring body 40 is gradually separated from the fast gear 20, and the synchronizer ring body 40 is gradually connected with the overrunning gear 60 for one-way transmission, completing the overrunning action of the speed change device; when the synchronizer ring body 40 moves to squeeze the overrunning gear 60 to make it move axially, the synchronizer ring body 40 is completely separated from the fast gear 20, and at this time the synchronizer ring body 40 is connected with the slow gear 30 through the overrunning gear 60, completing the slow gear action of the speed change device;

[0056] The present invention is an electric vehicle without neutral gear, overrunning two-speed transmission device. When in use, the fast gear 20 and the slow gear 30 are rotated at different speeds and in the same direction through the input component.

[0057] When the fast gear is output, the shift fork component can drive the synchronizer ring body 40 to move axially. For the convenience of description, the fast gear 20 is located on the left and the slow gear 30 is located on the right. When the movement approaches the extreme position on the left, the synchronizer ring body 40 is fully connected with the fast gear 20 for transmission. 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. 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 output power. In this state, the input component can be reversed, and the fast gear 20 drives the synchronizer ring body 40 and the output shaft 10 to realize the reverse gear action.

[0058] When the slow gear is output, the shift fork component drives the synchronizer ring body 40 to move rightward and squeezes the overrunning gear 60 so that the overrunning gear 60 moves elastically axially, and the synchronizer 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 co-rotation. At this time, the slow gear 30 drives the overrunning gear 60 and the synchronizer ring body 40, and the synchronizer ring body 40 drives the output shaft 10 for power output, while 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 for power output; the one-way rotation means that there is relative rotation between the synchronizer ring body 40 and the slow gear 30, and when the slow gear 30 rotates forward relative to the synchronizer ring body 40, it can drive the synchronizer ring body 40 to rotate together, and when the slow gear 30 rotates reversely relative to the synchronizer ring body 40, power transmission cannot be performed;

[0059] In the process of the synchronizer ring body 40 moving rightward from the extreme position of the fast gear 20, the synchronizer ring body 40 gradually separates from the fast gear 20, and the synchronizer ring body 40 gradually connects with the overrunning gear 60. In this state, the synchronizer ring body 40 is connected to the fast gear 20 and the slow gear 30 respectively. Since the rotation speed of the fast gear 20 relative to the synchronizer ring body 40 is greater than the rotation speed 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 in the opposite direction relative to the overrunning gear 60, that is, the overrunning gear 60 cannot output power to the synchronizer ring body 40 to complete the overrunning action, and the speed change device still operates in the fast gear and directly switches to the slow gear; on the contrary, when the synchronizer ring body 40 moves leftward from being fully connected with the overrunning gear 60, the overrunning action is also performed to transition, and the slow gear is directly switched to the fast gear;

[0060] The present invention discloses an electric vehicle non-neutral overrunning two-speed transmission device. The synchronous ring body 40 moves axially between the fast gear 20 and the overrunning gear 60. The overall structure is simple and compact. The two-speed shifting of the fast gear and the slow gear and the overrunning action are realized. During the overrunning action, the synchronous ring body 40 is gradually separated from the fast gear 20, and the synchronous ring body 40 is gradually connected with the overrunning gear 60 for one-way transmission, so as to avoid the delay and slow response caused by the neutral gear when switching between the two gears. In addition, during the frequent switching process, the overrunning action can be transitioned, so as to reduce the impact and frustration of the gear shifting, and improve Driving comfort and stability; in addition, the present electric vehicle non-neutral, overrunning two-speed transmission device can be applied to two-speed automatic transmission in electric vehicles, that is, the synchronizer ring body 40 is connected to the actuator, and when the electric vehicle requires different power output ends, the control system controls the actuator to act on the synchronizer ring body 40 to perform axial shifting operations, thereby changing the speed ratio for power output. For example, when driving at low speed or when a large torque output is required, the synchronizer ring body 40 switches to a slow gear, and when driving at high speed or when a smaller torque output is required, the synchronizer ring body 40 switches to a fast gear, completing two-speed automatic transmission.

[0061] In some examples of the present invention, Figure 5 As shown, the slow gear 30 is axially limited on the output shaft 10, and the cylinder in the middle is connected to the overrunning gear 60 through a spline;

[0062] An elastic member 70 is provided between the slow gear 30 and the overrunning gear 60, and the slow gear 30 is subjected to an elastic force toward the fast gear 20;

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

[0064] An elastic member 70 is provided between the slow gear 30 and the overrunning gear 60, for example, a cylindrical spring is mounted thereon, and both 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 synchronizer ring body 40 to rotate in the opposite direction relative to the overrunning gear 60. At this time, the overrunning gear 60 is squeezed and can be elastically staggered and cannot output power.

[0065] In some examples of the present invention, Figure 2 , Figure 4 As shown, the fast gear 20 is provided with a second external spline 21 on one side facing the synchronizer ring body 40;

[0066] The end surface of the synchronizer ring body 40 facing the fast gear 20 is provided with a second internal spline 41 matched and connected with the second external spline 21;

[0067] Specifically, Figure 2As shown, the right end face of the fast gear 20 is provided with a second external spline 21, and the left end face of the synchronizer ring body 40 is provided with a second internal spline 41 matching the second external spline 21. When the fast gear is actuated, the synchronizer ring body 40 moves close to the extreme position of the fast gear 20. At this time, the synchronizer ring body 40 and the fast gear 20 are connected by splines to ensure power output.

[0068] In some examples of the present invention, Figure 4 As shown, the end surface of the synchronizing ring body 40 facing the overrunning gear 60 is provided with a first tooth 42, and one end side of the overrunning gear 60 is provided with a tooth groove 61;

[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 synchronizing ring body 40;

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

[0071] Specifically, when the synchronizer ring body 40 rotates forwardly relative to the slow gear 30, the first tooth 42 can match the tooth groove 61 through the right angle and acute angle ends, so that the overrunning gear 60 and the synchronizer ring body 40 are meshed for one-way transmission. When the synchronizer 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 working surface. When staggered, the overrunning gear 60 compresses the elastic member 70.

[0072] Alternatively, the end side of the overrunning gear 60 is provided with a second tooth, and the end side of the synchronizing ring body 40 is provided with a tooth groove 61 matching the second tooth;

[0073] When the synchronizer ring body 40 moves and is connected to the fast gear 20 and the overrunning gear 60 at the same time, since the rotation speed of the fast gear 20 relative to the synchronizer ring body 40 is greater than the rotation speed 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 in the opposite direction relative to the overrunning gear 60. In this example, the first tooth 42 and the tooth groove 61 can be staggered with the longest side as the working surface, and the overrunning gear 60 through the one-way transmission cannot output power to the synchronizer ring body 40 to complete the overrunning action.

[0074] In some examples of the present invention, Figure 2 , Figure 4 As shown, a shaft sleeve 50 is provided between the synchronizer ring body 40 and the output shaft 10;

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

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

[0077] When the synchronizer ring body 40 moves axially, the synchronizer ring body 40 is always connected with the shaft sleeve 50 for transmission;

[0078] Specifically, when the synchronizer ring body 40 moves axially, the synchronizer ring body 40 always transmits power to the output shaft 10 through the shaft sleeve 50; when the synchronizer ring body 40 moves close to the limit position of the fast gear 20, the overrunning gear 60 is limited by the elastic force by contacting with the shaft sleeve 50, so the shaft sleeve 50 can limit the fast gear 20 and the overrunning gear 60;

[0079] In this example, a shaft sleeve 50 is provided between the fast gear 20 and the overrunning gear 60, and the synchronizer ring body 40 is always connected to the shaft sleeve 50 for transmission. The shaft sleeve 50 can ensure that in the case of power output, the synchronizer ring body 40 can be flexibly connected to the fast gear 20 and the overrunning gear 60 for transmission, and the two end faces of the shaft sleeve can respectively contact 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.

[0080] In some examples of the present invention, Figure 4 As shown, the inner side of the sleeve 50 and the output shaft 10, and the outer side and the synchronizer ring body 40 are connected to each other through splines;

[0081] Specifically, the inner side of the sleeve 50 is provided with a first internal spline 52, which is matched and connected with the external spline on the output shaft 10, and the outer side is provided with a third external spline 51, which is matched and connected with the second internal spline 41 of the synchronizer ring body 40;

[0082] The shaft sleeve 50 is connected to the output shaft 10 and the synchronizer ring body 40 by spline means inside and outside, so that the connection force is more uniform, and the stress concentration is reduced, and the bearing capacity and stability are higher.

[0083] In some examples of the present invention, an annular groove is provided on the outer peripheral side of the synchronization ring body 40;

[0084] The shift fork in the shift fork component is connected to the annular groove and drives the synchronizer ring body 40 to move axially.

[0085] When the electric vehicle has no neutral gear and the overrunning two-speed transmission device is used, the following steps are specifically included:

[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 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;

[0088] S3, when the slow gear is output, the synchronizer ring body 40 moves axially to squeeze the overrunning gear 60 to make it move axially elastically, the synchronizer ring body 40 is completely separated from the fast gear 20, and is gradually or completely connected with the overrunning gear 60 to perform one-way transmission. At this time, the slow gear 30 drives the synchronizer ring body 40 through the overrunning gear 60, and the synchronizer ring body 40 drives the output shaft 10 to output power;

[0089] S4, during the axial movement of the synchronizer ring body 40 from the extreme position of the fast gear 20 to squeeze the overrunning gear 60, the synchronizer ring body 40 gradually separates from the fast gear 20, and the synchronizer ring body 40 gradually connects with the overrunning gear 60 for one-way transmission.

[0090] At this time, the rotation speed of the fast gear 20 relative to the synchronizer ring body 40 is greater than the rotation speed 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 in the opposite direction relative to the overrunning gear 60, so that the overrunning gear 60 cannot output power to the synchronizer ring body 40, thereby completing the overrunning action and the switching transition between the fast gear and the slow gear.

[0091] The above text describes in detail an exemplary implementation of an electric vehicle non-neutral, overrunning two-speed transmission device proposed by the present invention with reference to a preferred embodiment. However, those skilled in the art will appreciate that, without departing from the concept of the present invention, various modifications and variations may be made to the above-mentioned specific embodiments, and various technical features and structures proposed by the present invention may be combined in various ways without exceeding the protection scope of the present invention, which is determined by the appended claims.

Claims

1. A two-speed transmission device for electric vehicles without neutral gear and overrunning, characterized in that: include: An output shaft (10) 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) is axially movable 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). After the overrunning gear (60) compresses the elastic force, it can be connected with the slow gear (30) to rotate simultaneously. A synchronizing 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 the overrunning gear (60) can be squeezed alone to connect it to the slow gear (30) to perform a slow gear action.

2. The electric vehicle non-neutral, overrunning two-speed transmission device according to claim 1, characterized in that: 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) to rotate simultaneously; An elastic member (70) is provided between the slow gear (30) and the overrunning gear (60).

3. The electric vehicle non-neutral, overrunning two-speed transmission device according to claim 1, characterized in that: 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 and connected with the second external spline (21).

4. The electric vehicle non-neutral, overrunning two-speed transmission device according to claim 3, characterized in that: The end surface of the synchronizing ring body (40) facing the overrunning gear (60) is provided with a first tooth (42), and one end side of the overrunning 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 angle is arranged at a right angle or an acute angle with the end surface of the synchronizing ring body (40); The shape of the tooth groove (61) is consistent with the outer contour of the first tooth (42).

5. A non-neutral, overrunning two-speed transmission device for electric vehicles according to any one of claims 1 to 4, characterized in that: A shaft sleeve (50) is provided between the synchronizing 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 synchronizing ring body (40) moves axially, the synchronizing ring body (40) is always connected with the shaft sleeve (50) for transmission.

6. The electric vehicle non-neutral, overrunning two-speed transmission device according to claim 5, 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 synchronizing ring body (40) are connected to each other via splines.

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

8. A method for using the non-neutral, 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 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 which 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 is output, the synchronizer ring body (40) moves axially to squeeze the overrunning gear (60) to make it move axially elastically, the synchronizer ring body (40) is completely separated from the fast gear (20), and is gradually or completely connected to the overrunning gear (60) to perform one-way transmission, at which time the slow gear (30) drives the synchronizer ring body (40) through the overrunning gear (60), and the synchronizer ring body (40) drives the output shaft (10) to output power; S4, when the synchronizer ring body (40) moves axially from the extreme position of the fast gear (20) to squeeze the overrunning gear (60), the synchronizer ring body (40) gradually separates from the fast gear (20), and the synchronizer ring body (40) gradually connects with the overrunning gear (60) to perform one-way transmission. At this time, the fast gear (20) can drive the synchronizer ring body (40) to rotate in the opposite direction relative to the overrunning gear (60), so that the overrunning gear (60) cannot output power to the synchronizer ring body (40), thereby completing the overrunning action and the switching transition between the fast gear and the slow gear.

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