Electrically driven ball screw transmission shift actuator and gearbox

Abstract

The utility model discloses a kind of gear shifting actuator and gearbox of electric drive ball screw drive, it is characterized by: including shell, motor assembly and transmission assembly, the cavity is in the shell, two openings are equipped on the shell outer wall and are communicated with the cavity respectively;The motor assembly is installed on the shell, the output end of the motor assembly is inserted in the cavity from one the opening, gear is equipped on the output end of the motor assembly;The transmission assembly is rotatably installed in the cavity, and the axis of the transmission assembly is perpendicular to the axis of the gear, the transmission assembly includes ball screw, ball screw nut and face gear, the gear is engaged with the face gear;The ball screw nut is used to be connected with gearbox shift fork shaft.

Description

Technical Field

[0001] This utility model relates to an automobile and automobile parts, and more particularly to a shifting actuator with an electric drive ball screw transmission. Background Technology

[0002] Existing electric actuators typically use a motor to drive a transmission structure, ultimately moving the actuator itself. However, their layout is often unreasonable, their structure complex, and their space utilization low, resulting in large axial and radial dimensions, large size, heavy weight, high manufacturing costs, and hindering miniaturization, weight reduction, and placement in confined spaces. For the transmission structure, gear and rack or threaded drives are commonly used. Gear and rack structures cannot be linearly arranged, occupy significant lateral / longitudinal space, and have low execution accuracy. Threaded drives convert the selective motion of the motor into linear motion through the interaction of a screw and nut. Due to the low efficiency of threaded transmission, larger motor sizes are required to meet the shifting force requirements, thus limiting the application of this shifting mechanism in passenger cars and compact vehicles. Summary of the Invention

[0003] The purpose of this invention is to provide a shifting actuator and gearbox for an electrically driven ball screw transmission. By using this structure, costs are reduced, assembly difficulty is lowered, and the applicability is expanded.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is: a shifting actuator for an electrically driven ball screw transmission, comprising:

[0005] A housing having a cavity inside, and two openings on the outer wall of the housing communicating with the cavity respectively;

[0006] A motor assembly is mounted on the housing, and the output end of the motor assembly is inserted into the cavity from one of the openings. A gear is provided on the output end of the motor assembly.

[0007] A transmission assembly is rotatably mounted in the cavity on the side away from the motor assembly, and the axis of the transmission assembly is perpendicular to the axis of the gear. The transmission assembly includes a ball screw, a ball screw nut, and an end face gear. The end face gear is coaxial with and fixedly connected to the ball screw. The ball screw nut is mounted on the ball screw, and the gear meshes with the end face gear. The ball screw nut is positioned opposite another opening and is used to connect to the gearbox shift fork shaft. The motor assembly is configured to drive the end face gear and the ball screw to rotate, and to drive the ball screw nut to move linearly along the axis of the ball screw within the cavity.

[0008] In the above technical solution, the ball screw nut is integrally provided with a connecting piece that connects to the gearbox shift fork shaft.

[0009] In the above technical solution, the cavity is further provided with a guide member, which prevents the ball screw nut from rotating with the ball screw, and when the ball screw rotates, the ball screw nut moves linearly along the axial direction of the ball screw.

[0010] In the above technical solution, one end of the transmission component is rotatably connected to the housing on one side of the chamber via a first bearing, and the other end of the transmission component is disposed close to the housing on the other side of the chamber, or the other end of the transmission component is rotatably connected to the housing on the other side of the chamber, or the other end of the transmission component is rotatably connected to the housing on the other end of the chamber via a second bearing.

[0011] In the above technical solution, the end face gear is rotatably connected to the housing via the first bearing, the end of the ball screw on the side away from the end face gear is located close to the inner wall of the cavity, or the end of the ball screw on the side away from the end face gear is rotatably connected to the housing, or the end of the ball screw on the side away from the end face gear is rotatably connected to the housing via the second bearing.

[0012] In the above technical solution, one end of the end face gear is provided with a toothed disc facing the direction of the ball screw nut, and the outer diameter of the toothed disc is larger than the inner diameter of the first bearing;

[0013] The first bearing is sleeved on the end face gear, and the gear plate is disposed between the first bearing and the ball screw nut.

[0014] In the above technical solution, a retaining ring is also provided on the outside of the end face gear, and the outer end of the retaining ring is secured inside the housing.

[0015] In the above technical solution, a first slot is provided on the outer surface of the end face gear, a second slot is provided on the housing, the inner end of the retaining ring is engaged in the first slot, and the outer end of the retaining ring is engaged in the second slot;

[0016] And / or, the first bearing is disposed between the retaining ring and the gear disc.

[0017] In the above technical solution, the retaining ring is a heavy-duty retaining ring.

[0018] This utility model also provides a gearbox, characterized in that: it includes a gearbox body and the above-mentioned electrically driven ball screw transmission shifting mechanism, the gearbox body is provided with a gearbox shift fork shaft, the shifting mechanism is installed in the gearbox body, and the ball screw nut is connected to the gearbox shift fork shaft;

[0019] And / or, the motor assembly is provided with an interface that is exposed on the outside of the gearbox body;

[0020] And / or, the side wall of the gearbox shift fork shaft is provided with a slot, and the side of the ball screw nut is inserted into the slot.

[0021] Due to the application of the above technical solution, this utility model has the following advantages compared with the prior art:

[0022] 1. The shifting actuator of this utility model consists of three parts: housing, motor assembly and transmission assembly. Each part adopts a modular structure, which is suitable for diverse application scenarios, can reduce the overall design difficulty and management cost, and is also easy to assemble;

[0023] 2. In this utility model, the transmission component adopts a retaining ring for limiting. The retaining ring is preferably a heavy-duty retaining ring, which can withstand an axial force of more than 60,000 Newtons, thereby improving the reliability of the product. Compared with the existing riveting fixing method, it is easier to assemble, more efficient to produce, and cheaper to produce. At the same time, it reduces the overall cost of parts, reduces assembly difficulty, and also improves the reliability of the product.

[0024] 3. In this utility model, the motor assembly meshes with the end face gear of the gear and transmission assembly. The end face gear is directly fixed to the ball screw, thereby driving the ball screw to rotate. The rotation of the ball screw drives the movement of the ball screw nut. The output end of the ball screw and the electrode assembly are perpendicular, and the ball screw nut can be directly connected to the gearbox shift fork shaft. This can greatly save installation space, improve transmission efficiency, and at the same time reduce axial and radial dimensions, making the overall shape of the shift actuator neat and small in size, which can be adapted to more vehicle models and has a wider range of applications.

[0025] 4. This utility model uses a motor-driven ball screw, which has high transmission efficiency, low force loss, and lower energy consumption of the motor assembly under the premise of the same shifting force. Attached Figure Description

[0026] Figure 1 This is a three-dimensional structural schematic diagram of the gear shifting actuator in Embodiment 1 of this utility model;

[0027] Figure 2 This is a three-dimensional structural schematic diagram of the gear shifting actuator in Embodiment 1 of this utility model (in cross-sectional view of the housing);

[0028] Figure 3 yes Figure 1 Exploded view;

[0029] Figure 4This is a structural schematic diagram of the motor assembly and transmission assembly in the connected state in Embodiment 1 of this utility model;

[0030] Figure 5 This is a schematic diagram of the transmission assembly in Embodiment 1 of this utility model (the first bearing and retaining ring are installed on the end face gear in cross section);

[0031] Figure 6 This is a schematic diagram of the end face gear in Embodiment 1 of this utility model;

[0032] Figure 7 This is a schematic diagram of the structure of the ball screw nut installed on the ball screw in Embodiment 1 of this utility model;

[0033] Figure 8 This is a schematic diagram of the structure of the ball screw nut in Embodiment 1 of this utility model;

[0034] Figure 9 This is a schematic diagram of the gearbox shift fork shaft in Embodiment 1 of this utility model.

[0035] Wherein: 1. Housing; 11. Chamber; 12. Guide component; 13. Second slot;

[0036] 2. Motor assembly; 21. Gear; 22. Interface; 23. Bolt;

[0037] 3. Transmission assembly; 31. Ball screw; 32. Ball screw nut; 33. End face gear; 34. First bearing; 35. Snap ring; 320. Connecting piece; 330. Gear disc; 331. First groove;

[0038] 4. Gearbox shift fork shaft; 41. Slot. Detailed Implementation

[0039] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0040] Example 1: See Figure 1-9 As shown, an electrically driven ball screw transmission shifting mechanism includes a housing 1, a motor assembly 2, and a transmission assembly 3. Wherein:

[0041] Casing 1 The housing 1 has a chamber 11 inside, and the outer wall of the housing 1 has two openings that communicate with the chamber 11 respectively;

[0042] by Figure 2 Taking the direction of view as an example, the two openings are respectively set at the top and bottom of the shell. The top opening is only connected to the top surface of the shell, while the bottom opening is not only connected to the bottom surface of the shell, but also connected to the side wall below the shell.

[0043] Motor assembly 2 The motor assembly 2 is mounted on the housing 1, and the output end of the motor assembly 2 is inserted into the chamber 11 from one of the openings. A gear 21 is provided on the output end of the motor assembly 2.

[0044] In this embodiment, Figure 2 Taking the perspective direction as an example, the motor assembly is mounted on the top of the housing, with its output end located at the bottom. The output end of the motor assembly is inserted into the cavity of the housing through an opening at the top. The motor assembly includes a motor (or a combination of a motor and an SCU assembly, with the SCU assembly connected to the motor). The motor has an interface 22 on its side for connection to the vehicle. The motor is fixed to the top of the housing by multiple bolts 23. The output shaft at the bottom of the motor is inserted into the cavity, and a gear is mounted on the motor's output shaft. The vehicle controls the motor's operation, thereby driving the gear to rotate precisely at a predetermined angle. Preferably, the majority of the motor assembly is inserted into the cavity of the housing to shorten the axial dimension of the entire shift actuator.

[0045] Transmission component 3 The transmission assembly 3 is rotatably mounted in the chamber 11 on the side away from the motor assembly 2, and the axis of the transmission assembly 3 is perpendicular to the axis of the gear 21. The transmission assembly 3 includes a ball screw 31, a ball screw nut 32, and an end face gear 33. The end face gear 33 is coaxial with and fixedly connected to the ball screw 31. The ball screw nut 32 is mounted on the ball screw 31, and the gear 21 meshes with the end face gear 33. The ball screw nut 32 is positioned opposite another opening and is used to connect to the gearbox shift fork shaft 4. The motor assembly 2 is configured to drive the end face gear 33 and the ball screw 31 to rotate, and to drive the ball screw nut 32 to move linearly along the axis of the ball screw 31 in the chamber 11.

[0046] In this embodiment, Figure 2Taking the perspective direction as an example, the transmission component is located at the lower part of the chamber and faces the opening below. The motor component is arranged vertically, and the transmission component is arranged horizontally (it can be arranged laterally or longitudinally). In this embodiment, the axis of the gear is parallel to the axis of the chamber, and the axis of the transmission component is perpendicular to the axis of the gear. Taking the ball screw arranged laterally as an example, the ball screw is arranged perpendicular to the axis of the gear. The end face gear is mounted on the outer surface of the left side of the ball screw. The end face gear and the ball screw are coaxially arranged and fixedly connected. The ball screw nut is screwed onto the ball screw on the right side of the end face gear. The left side of the end face gear is rotatably connected to the housing on the left side of the chamber, and the right end of the ball screw is rotatably connected to the housing on the right side of the chamber. Multiple protruding teeth are arranged around the outer surface of the right side of the end face gear (the protruding teeth can also be arranged on the left side of the end face gear). The multiple protruding teeth are arranged around the outside of the ball screw. The gear and the protruding teeth above the ball screw In the preferred configuration, the gear is positioned directly above the ball screw, with its bottom close to the ball screw nut. This structure minimizes the axial dimension of the shift actuator. Furthermore, due to the horizontal arrangement of the transmission components, the size of the end gear can be adjusted according to actual needs, and its radial dimension can be minimized, making it smaller than the diameter of the motor assembly. This results in smaller axial and radial dimensions of the entire shift actuator, leading to a smaller overall size and compatibility with more vehicle types (passenger cars, commercial vehicles, gasoline vehicles, hybrid vehicles, etc.), thus broadening its application range. Simultaneously, the ball screw nut can be directly connected to the gearbox shift fork shaft, eliminating the need for a separate component for connecting the ball screw nut and the gearbox shift fork shaft. This also reduces the number of parts, lowers costs, and facilitates assembly.

[0047] Because the ball screw nut is connected to the gearbox shift fork shaft, when the ball screw rotates, the ball screw nut will not rotate with it. It can only move along the axis of the ball screw, thereby driving the gearbox shift fork shaft to move and realize the shifting operation.

[0048] In this invention, the motor assembly is positioned above the ball screw, which saves layout space and reduces the size of the shifting actuator. The gear on the motor assembly drives the end face gear to transmit torque. It can design different gear ratios for the gears and end face gears according to the shifting force requirements and corresponding needs of the gearbox, achieving modular design requirements, reducing product design difficulty and development costs, and making it more widely applicable.

[0049] To avoid manufacturing a separate part to connect the ball screw nut and the gearbox shift fork shaft, a connector 320 is integrally provided on the ball screw nut 32 to connect with the gearbox shift fork shaft 4. The connector 320 is directly integrally formed with the ball screw nut 32, that is, the shape of the ball screw nut can be made to fit with the gearbox shift fork shaft, and the connector is made into a finger shape, which can be directly connected to the gearbox shift fork shaft. In this way, there is no need to assemble the connector and the ball screw nut separately, reducing the assembly difficulty.

[0050] See Figure 2 , 3 As shown, the chamber 11 is also provided with a guide 12, which prevents the ball screw nut 32 from rotating with the ball screw 31, and when the ball screw 31 rotates, the ball screw nut 32 moves linearly along the axial direction of the ball screw 31.

[0051] In this embodiment, to ensure that the ball screw nut is precisely positioned and connected to the gearbox shift fork shaft during the assembly of the shift actuator, a guide is provided within the chamber to restrict the rotation of the ball screw nut within the chamber. This prevents the ball screw nut from rotating with the ball screw and allows it to move only along the axis of the ball screw. There are various ways the guide can limit the movement of the ball screw nut. In this embodiment, the guide uses two guide shafts, parallel to the ball screw. These two guide shafts can be positioned above, to the side, or elsewhere on the ball screw nut. A flat surface is provided on the outer surface of the ball screw nut, or on the outer surface of the connector. The flat surface faces the guide shaft and contacts it. Therefore, when the ball screw rotates, the contact between the two guide shafts and the flat surface prevents the ball screw nut from rotating with the ball screw; it can only move along the axis of the ball screw. Of course, the guide component can also be a guide shaft or guide rail (one or more), which is set parallel to the ball screw. A groove is provided on the outer surface of the ball screw nut or the outer surface of the connecting part to cooperate with the guide shaft or guide rail. The groove and the guide shaft or guide rail restrict the rotation of the ball screw nut. In this structure, the position of the transmission component is effectively guaranteed after assembly, which facilitates its assembly with the gearbox.

[0052] See Figure 2 As shown, one end of the transmission component 3 is rotatably connected to the housing 1 on one side of the chamber 11 via a first bearing 34, and the other end of the transmission component 3 is disposed near the housing 1 on the other side of the chamber, or the other end of the transmission component 3 is rotatably connected to the housing 1 on the other side of the chamber 11, or the other end of the transmission component 3 is rotatably connected to the housing 1 at the other end of the chamber 11 via a second bearing.

[0053] In this embodiment, Figure 2 From the perspective of the viewpoint, the left end of the transmission component is rotatably connected to the housing on the left side of the chamber via the first bearing, while the right end of the transmission component has three connection methods: First, the right end of the transmission component is directly suspended and does not contact the housing; second, the right end of the transmission component is directly rotatably connected to the housing; third, the right end of the transmission component is rotatably connected to the housing via the second bearing.

[0054] Preferably, a third structure is used, in which the first and second bearings are used to provide rotational support for the transmission components, ensuring smooth and stable rotation.

[0055] See Figure 2 As shown, the end face gear 33 is rotatably connected to the housing 1 via the first bearing 34. The end of the ball screw 31 on the side away from the end face gear 33 is located close to the inner wall of the chamber 11, or the end of the ball screw 31 on the side away from the end face gear 33 is rotatably connected to the housing 1, or the end of the ball screw 31 on the side away from the end face gear 33 is rotatably connected to the housing 1 via the second bearing.

[0056] In this embodiment, Figure 2 From the perspective of the viewpoint, the end face gear is rotatably connected to the housing via the first bearing. The end face gear is directly mounted on the outer surface of the left end of the ball screw, and the two are coaxially fixedly connected. There are three ways to connect the right end of the ball screw: First, the right end of the ball screw is suspended, close to the inner wall of the chamber, and does not contact the housing; second, the right end of the ball screw is directly rotatably connected to the housing; third, the right end of the ball screw is rotatably connected to the housing via the second bearing.

[0057] Preferably, the third structure would be selected. However, in this embodiment, due to the large size of the end face, the main rotational support is provided by the first bearing. Therefore, the second structure would be selected, with the right end of the ball screw rotatably connected to the housing, mainly serving a limiting function.

[0058] See Figure 2-6 As shown, one end of the end face gear 33 is provided with a gear disk 330 facing the ball screw nut 32, and the outer diameter of the gear disk 330 is larger than the inner diameter of the first bearing 34;

[0059] See Figure 2 , 4 As shown in Figure 5, the first bearing 34 is sleeved on the end face gear 33, and the gear disk 330 is disposed between the first bearing 34 and the ball screw nut 32.

[0060] The right outer surface of the gear disk has multiple convex teeth arranged in a ring, and the gear directly meshes with the convex teeth of the gear disk. Since the outer diameter of the gear disk is larger than the inner diameter of the first bearing, it can restrict the first bearing from moving to the right, thereby restricting the transmission assembly from moving to the left. In this embodiment, a blind hole is provided on the right inner wall of the chamber to provide rotational support and limit the right end of the ball screw, preventing the ball screw from moving to the right.

[0061] Furthermore, a retaining ring 35 is also provided on the outside of the end face gear 34, and the outer end of the retaining ring 35 is secured inside the housing 1.

[0062] In this embodiment, a hole communicating with the chamber is provided on the left side wall of the housing. During the assembly of the transmission assembly, the right end of the transmission assembly is inserted into the chamber through the hole. The right end of the ball screw is connected to a blind hole on the right inner wall of the chamber. The gear plate is located in the chamber, and the first bearing is located in the hole and in contact with the inner wall of the hole. To further limit the left side of the transmission assembly and prevent it from moving to the left, a retaining ring is also provided to restrict the leftward movement of the transmission assembly, thereby achieving axial limiting of the transmission assembly. The hole is a stepped hole, including a first hole and a second hole that communicate with each other. The outer diameter of the first hole is larger than that of the second hole. One side of the first hole communicates with the outer wall of the housing, and the other side communicates with the second hole. The other side of the second hole communicates with the chamber. The outer diameter of the first hole matches the outer diameter of the first bearing. The first bearing is installed in the first hole, which also restricts the first bearing from moving inward into the chamber.

[0063] See Figure 2 , 5 As shown, a first groove 331 is provided on the outer surface of the end face gear 33, and a second groove 13 is provided on the housing 1. The inner end of the retaining ring 35 is engaged in the first groove 331, and the outer end of the retaining ring 35 is engaged in the second groove 13; wherein, the second groove is provided on the inner surface of the first hole.

[0064] The first bearing 34 is disposed between the retaining ring 35 and the gear disk 330.

[0065] In this method, the retaining ring can be used to restrict the end face gear and prevent the transmission component from moving axially. At the same time, the right side of the inner ring of the first bearing contacts the left side wall of the gear disk, and the right side of the retaining ring contacts the left side wall of the inner and outer rings of the first bearing, which can also restrict the bearing and prevent the bearing from moving axially relative to the end face gear.

[0066] Furthermore, the retaining circumference is a heavy-duty retaining circumference. It can withstand an axial force of over 60,000 Newtons, greatly improving the reliability of the product.

[0067] In this utility model, the ball screw adopts a large lead ball screw, which has the characteristics of fast shifting speed, high precision, low noise and long service life. It can improve vehicle performance while taking into account driving and riding comfort. Moreover, it can design and use different gears and face gears with different gear ratios according to the shifting force requirements and corresponding needs of different transmissions, so as to achieve modular design requirements, reduce product design difficulty and development cost, and have stronger adaptability.

[0068] This utility model also provides a gearbox, including a gearbox body and the above-mentioned electrically driven ball screw transmission shifting mechanism. The gearbox body is provided with a gearbox shift fork shaft, the shifting mechanism is installed in the gearbox body, and the ball screw nut is connected to the gearbox shift fork shaft. The motor assembly is provided with an interface, which is exposed outside the gearbox body.

[0069] In this embodiment, the bottom of the shift actuator is directly installed into the gearbox body, the connecting piece on the ball screw nut is directly connected to the gearbox shift fork shaft, and the shift actuator is directly connected to the gearbox body by bolts, with only the interface on the motor assembly exposed, which can effectively save installation space and improve product compatibility.

[0070] See Figure 9 As shown, a slot 41 is provided on the side wall of the gearbox shift fork shaft 4, and the side of the ball screw nut 32 is inserted into the slot 41. The connecting piece on the ball screw nut can be directly inserted into the slot of the gearbox shift fork shaft to realize the connection between the shift actuator and the gearbox shift fork shaft. This is convenient for assembly, reduces assembly difficulty, saves installation space, and improves transmission efficiency.

[0071] When the gearbox needs to shift gears, after the motor assembly receives the gearbox shift signal, the motor in the motor assembly drives the gear to rotate. The rotation of the motor shaft is transmitted to the end gear through gear meshing. Since the end gear is directly fixed to the ball screw (it can be fixed by welding or riveting; in this embodiment, both are fixed by riveting), the end gear drives the ball screw to rotate when it rotates, thereby pushing the ball screw nut to make linear motion. The ball screw nut then moves through the gearbox shift fork shaft to operate the gearbox shift fork to complete the shift action.

[0072] In the description of this utility model, it should be understood that the terms "upper," "lower," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. In the description of the invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0073] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. For instance, the two components can be mechanically connected by contact or abutting; they can also be directly hooked or connected by an intermediate medium; or they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

Claims

1. A shifting actuator for an electrically driven ball screw transmission, characterized in that: include: The housing (1) has a chamber (11) inside, and the outer wall of the housing (1) has two openings that communicate with the chamber (11) respectively; A motor assembly (2) is mounted on the housing (1), and the output end of the motor assembly (2) is inserted into the chamber (11) from one of the openings. A gear (21) is provided on the output end of the motor assembly (2). A transmission assembly (3) is rotatably mounted in the chamber (11) on the side away from the motor assembly (2), and the axis of the transmission assembly (3) is perpendicular to the axis of the gear (21). The transmission assembly (3) includes a ball screw (31), a ball screw nut (32), and an end face gear (33). The end face gear (33) is coaxial with and fixedly connected to the ball screw (31). The ball screw nut (32) is mounted on the ball screw. On the lead screw (31), the gear (21) meshes with the end face gear (33); the ball screw nut (32) is positioned opposite another opening, and the ball screw nut (32) is used to connect with the gearbox shift fork shaft (4). The motor assembly (2) is configured to drive the end face gear (33) and the ball screw (31) to rotate, and drive the ball screw nut (32) to move linearly along the axis of the ball screw (31) in the chamber (11).

2. The shifting actuator of the electrically driven ball screw transmission according to claim 1, characterized in that: The ball screw nut (32) is integrally provided with a connector (320) that is connected to the gearbox shift fork shaft (4).

3. The shifting actuator of the electrically driven ball screw transmission according to claim 1 or 2, characterized in that: The chamber (11) is also provided with a guide (12), which prevents the ball screw nut (32) from rotating with the ball screw (31), and when the ball screw (31) rotates, the ball screw nut (32) moves linearly along the axis of the ball screw (31).

4. The shifting actuator of the electrically driven ball screw transmission according to claim 1, characterized in that: One end of the transmission assembly (3) is rotatably connected to the housing (1) on one side of the chamber via a first bearing (34), and the other end of the transmission assembly (3) is located near the housing (1) on the other side of the chamber (11), or the other end of the transmission assembly (3) is rotatably connected to the housing (1) on the other side of the chamber (11), or the other end of the transmission assembly (3) is rotatably connected to the housing (1) on the other side of the chamber (11) via a second bearing.

5. The shifting actuator of the electrically driven ball screw transmission according to claim 4, characterized in that: The end face gear (33) is rotatably connected to the housing (1) via the first bearing (34). The end of the ball screw on the side away from the end face gear (33) is located close to the inner wall of the chamber (11), or the end of the ball screw (31) on the side away from the end face gear (33) is rotatably connected to the housing (1), or the end of the ball screw (31) on the side away from the end face gear (33) is rotatably connected to the housing (1) via the second bearing.

6. The shifting actuator of the electrically driven ball screw transmission according to claim 4, characterized in that: One end of the end face gear (33) is provided with a gear disk (330) facing the ball screw nut (32), and the outer diameter of the gear disk (330) is larger than the inner diameter of the first bearing (34); The first bearing (34) is sleeved on the end face gear (33), and the gear disk (330) is disposed between the first bearing (34) and the ball screw nut (32).

7. The shifting actuator of the electrically driven ball screw transmission according to claim 6, characterized in that: A retaining ring (35) is also fitted on the outside of the end face gear (33), and the outer end of the retaining ring (35) is fitted inside the housing (1).

8. The shifting actuator of the electrically driven ball screw transmission according to claim 7, characterized in that: The outer surface of the end face gear (33) is provided with a first slot (331), the housing (1) is provided with a second slot (13), the inner end of the retaining ring (35) is engaged in the first slot (331), and the outer end of the retaining ring (35) is engaged in the second slot (13). And / or, the first bearing (34) is disposed between the retaining ring (35) and the gear disc (330).

9. The shifting actuator of the electrically driven ball screw transmission according to claim 7, characterized in that: The retaining ring (35) is a heavy-duty retaining ring.

10. A gearbox, characterized in that: The gearbox includes a gearbox body and a shifting actuator with electric drive ball screw transmission as described in any one of claims 1-9. The gearbox body is provided with a gearbox shift fork shaft (4), the shifting actuator is installed in the gearbox body, and the ball screw nut (32) is connected to the gearbox shift fork shaft (4). And / or, the motor assembly (2) is provided with an interface (22) which is exposed outside the gearbox body; And / or, a slot (41) is provided on the side wall of the gearbox shift fork shaft (4), and the side of the ball screw nut (32) is inserted into the slot (41).

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