Shifting fork shaft assembly and gear shift actuator

Abstract

The utility model provides a fork axle assembly and gear shifting actuator, wherein, the fork axle assembly includes: a fork axle, the surface of fork axle is equipped with a recess; a magnet fixing part, contain a magnet, the magnet fixing part is fixed in the recess, and the magnet fixing part has the outer surface; A scraping piece is arranged in the shell of gear shifting actuator, and the scraping piece includes a circular arc type scraping surface, and the scraping surface is attached on the outer surface, when the fork axle axial movement, the scraping piece scrapes the outer surface of magnet fixing part. The utility model can prevent the interference of iron filings to position detection through the mode that the combination of dynamic scraping is combined with the isolation of wrapping, guarantees the gear shifting precision and reliability, and simple structure, low cost.

Description

Technical Field

[0001] This utility model relates to the field of automotive parts, specifically to a shift fork shaft assembly and a shift actuator. Background Technology

[0002] In automotive automatic manual transmissions (AMT), precise and rapid gear shifting requires real-time and accurate monitoring and control of the shift fork position. The shift fork drives the synchronizer via the axial movement of its shaft (or pushrod), thereby enabling the engagement and disengagement of different gears. To precisely control this process, the transmission control unit (TCU) needs to acquire accurate position information of the shift fork shaft in real time.

[0003] In existing technologies, a commonly used position detection scheme is a magnetic induction displacement detection system. Specifically, a magnet is placed on the shift fork shaft that drives the shift fork to move axially, and a displacement sensor, such as a Hall sensor, is correspondingly installed on the fixed transmission housing. When the shift fork shaft drives the magnet to move axially, the Hall sensor senses the position of the magnet by detecting changes in the magnetic field strength, and then calculates the accurate displacement of the shift fork, feeding this signal back to the TCU.

[0004] To mount the magnet, a recess (such as a groove or pit) is typically machined into the side wall of the shift fork shaft, and the magnet is mechanically secured to this recess by means of screws. This structural design allows the sensing surface of the magnet to be directly exposed to the internal working environment of the transmission.

[0005] However, during long-term operation, the internal moving parts of the transmission, such as gears, synchronizer rings, and bearings, inevitably experience wear, producing tiny metal shavings containing a large amount of ferromagnetic material. Because the installed magnets themselves are strongly magnetic, these ferromagnetic shavings are easily attracted and accumulate on the surface and edges of the magnets, as well as in the gaps between the magnets and the shift fork shaft recesses.

[0006] This iron filings contamination can cause a series of serious technical problems:

[0007] Signal interference and distortion: Iron filings adhering to the surface of a magnet can alter the magnetic field distribution in the surrounding space, causing distortion, drift, or instability in the magnetic field signal received by the Hall sensor. TCU control based on this distorted signal can lead to inaccurate shift position determination, resulting in shift shocks, shift failures, or even gear grinding, severely impacting shift quality and transmission reliability.

[0008] Risk of motion jamming: A large accumulation of iron filings, especially in the gaps around the magnet, can form a hard, adhered layer. When the shift fork shaft reciprocates in the support hole of the housing, these protruding iron filings may interfere with or rub against the inner wall of the support hole, increasing motion resistance, and in extreme cases, even causing the shift fork shaft to jam, resulting in a complete loss of shifting function.

[0009] Reduced reliability: The above problems directly reduce the long-term reliability and durability of the entire shift actuator and even the AMT system.

[0010] It should be noted that the information disclosed in the background section above is only used to enhance the understanding of the background of this utility model, and therefore may include information that does not constitute prior art known to those skilled in the art. Utility Model Content

[0011] In view of this, the present invention provides a shift fork shaft assembly and a shifting actuator to at least solve the problem that iron filings are attracted to the magnet surface of the shift fork shaft under current shifting conditions.

[0012] This utility model provides a shift fork shaft assembly for a gear shifting actuator, characterized in that the shift fork shaft assembly includes:

[0013] A shift fork shaft, wherein a recess is provided on the surface of the shift fork shaft;

[0014] A magnet fixing member containing a magnet is fixed in the recess, and the magnet fixing member has an outer surface; and

[0015] A scraping component is disposed within the housing of the shift actuator. The scraping component includes an arc-shaped scraping surface that abuts against the outer surface. When the shift fork shaft moves axially, the scraping component scrapes the outer surface of the magnet fixing component.

[0016] In some embodiments, the outer surface of the magnet fixing member and the surface of the shift fork shaft are combined to form a cylindrical surface, and the arc surface of the scraping surface is in contact with the cylindrical surface to scrape the iron filings adsorbed on the outer surface of the magnet fixing member.

[0017] In some embodiments, the magnet holder has a non-magnetic body portion that encloses the magnet.

[0018] In some embodiments, the bottom of the recess is provided with a screw hole and a positioning blind hole;

[0019] The magnet fixing component has a protruding post, and the magnet fixing component is screwed into the screw hole by a screw, and the protruding post is inserted into the positioning blind hole.

[0020] In some embodiments, the shift fork shaft assembly further includes at least one shift fork mounted on the shift fork shaft.

[0021] In some embodiments, the magnet holder fills the recess.

[0022] In some embodiments, the magnet retainer is fitted into the recess.

[0023] In some embodiments, the scraper is further provided with a connecting portion on the side opposite to the shift fork shaft, the connecting portion being integrally formed with the scraping surface and fixed in the housing.

[0024] In some embodiments, the scraping surface of the scraping member is provided with a friction-reducing coating. Advantageously, the coefficient of friction of the friction-reducing coating is in the range of 0.02 to 0.2.

[0025] In some embodiments, the shift fork shaft assembly further includes a sensor that interacts with the magnet, the sensor being capable of detecting changes in the magnetic field of the magnet to determine the axial position of the shift fork shaft.

[0026] In some embodiments, the sensor is a Hall sensor.

[0027] This utility model also provides a shifting actuator, such as the shift fork shaft assembly described above.

[0028] The beneficial effects of this application compared to the prior art include at least the following:

[0029] 1. Fundamentally prevent direct magnet contamination: By completely encapsulating the magnet with non-magnetic materials (such as engineering plastics) and filling the recess of the shift fork shaft, the magnet itself is no longer directly exposed to the internal environment of the transmission. Even if there are iron filings, they cannot directly adhere to the magnet, thus completely avoiding direct interference of iron filings with the magnetic field of the magnet itself and ensuring the stability of the magnetic field source.

[0030] 2. Active Cleaning Mechanism: The innovative scraper design cleans the outer surface of the magnet holder with each movement of the shift fork shaft. This promptly removes any small amounts of iron filings or grease that may adhere to the plastic-coated surface, preventing long-term accumulation. This is an active, dynamic protective measure with high reliability.

[0031] 3. Eliminate the risk of movement jamming: Because the outer surface of the magnet fixing component is flush with the outer circle of the shift fork shaft, forming a smooth cylindrical surface, it is inherently less prone to jamming. The continuous cleaning action of the scraper further ensures that no iron filings will accumulate in this area, completely eliminating the hidden danger of shift fork shaft movement jamming due to iron filings accumulation.

[0032] 4. Ensure detection accuracy and reliability: A stable magnetic field and a clean detection environment enable the Hall sensor to continuously obtain accurate and stable position signals, which greatly improves the control accuracy of the shift position and the working reliability of the entire AMT system.

[0033] 5. Low friction and high efficiency: The scraping parts are made of low friction coefficient materials, which have very little additional resistance to the movement of the shift fork shaft and can be ignored. They will not have a negative impact on the response speed and energy consumption of the shifting mechanism.

[0034] 6. Simple structure and low cost: This solution does not require large-scale modifications to the main structure of the existing shift fork shaft and housing. The magnet coating and scraping parts are simple in structure and easy to mass-produce, resulting in very limited increased manufacturing costs, while bringing significant performance improvements and reliability assurance.

[0035] 7. Easy to assemble and maintain: The magnet fasteners can be reliably fixed by screws or other means, and the scraping parts are usually assembled by simple press-in or snap-in. The entire assembly process is easy and convenient for automated production.

[0036] This utility model provides a shift fork shaft assembly and a shifting actuator that can effectively prevent iron filings from interfering with position detection by combining encapsulation isolation and dynamic scraping, thus ensuring shifting accuracy and reliability. It also has a simple structure and low cost.

[0037] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and do not limit the present invention. Attached Figure Description

[0038] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments conforming to the present invention and, together with the description, serve to explain the principles of the present invention. It is obvious that the drawings described below are merely some embodiments of the present invention, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort.

[0039] Figure 1 This is a cross-sectional view of a shift fork shaft assembly used in a gear shifting actuator, provided in an embodiment of this application.

[0040] Figure 2 yes Figure 1 Enlarged view of region A in the middle;

[0041] Figure 3 This is a schematic diagram of a shift fork shaft assembly provided in an embodiment of this application;

[0042] Figure 4This is a schematic diagram of the scraping component in a shift fork shaft assembly provided in an embodiment of this application;

[0043] Figure 5 This is a schematic diagram of the structure of a magnet fixing member in a shift fork shaft assembly provided in an embodiment of this application;

[0044] Figure 6 This is another structural schematic diagram of a magnet fixing member in a shift fork shaft assembly provided in an embodiment of this application;

[0045] Figure 7 This is a schematic diagram of the scraping surface and the outer surface cooperating in a shift fork shaft assembly provided in an embodiment of this application.

[0046] Figure label:

[0047] 1. Shift fork shaft

[0048] 11 recess

[0049] 12 screw holes

[0050] 13 Positioning blind holes

[0051] 2 Magnets

[0052] 3 Magnet fixing components

[0053] 31 Through Hole

[0054] 32 convex pillars

[0055] 33 Outer surface

[0056] 34 body part

[0057] 4. Shift fork

[0058] 5 Scratching parts

[0059] 51 Scratching surface

[0060] 52 Connecting part

[0061] 6 screws

[0062] 7. Housing Detailed Implementation

[0063] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that the present invention will be thorough and complete, and will fully convey the concept of the exemplary embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and therefore repeated descriptions of them will be omitted.

[0064] The use of terms such as "first," "second," and similar words in the specific description does not indicate any order, quantity, or importance, but is merely used to distinguish different components. Furthermore, in the description of this utility model, terms such as "upper," "lower," etc., indicate orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings. These are merely for ease of 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; therefore, they should not be construed as limitations on this utility model.

[0065] It should be noted that, unless otherwise specified, the embodiments of this utility model and the features in different embodiments can be combined with each other.

[0066] Through meticulous and in-depth research, the inventors of this case have found that while existing technologies acknowledge the problem of iron filings contamination, they lack simple, effective, and low-cost solutions. For example, attempts to improve the cleanliness standards inside the transmission or add filtration devices can reduce the generation and movement of iron filings to some extent, but they cannot fundamentally prevent the magnet from attracting iron filings, and are costly. Some solutions consider adding complex sealing structures to the magnets, but this increases the complexity of parts, assembly difficulty, and manufacturing costs, and may also affect the detection accuracy of sensors. This iron filings contamination has serious negative impacts: First, iron filings adhering to the magnet surface alter the surrounding magnetic field distribution, causing signal distortion, drift, or instability detected by the displacement sensor; second, severe iron filings accumulation may even cause the shift fork shaft to become obstructed in the support hole of the housing, resulting in jamming. Both of these situations directly affect the shifting accuracy and reliability of the transmission, and may even lead to malfunctions. Currently, the industry generally lacks a highly efficient and universal anti-contamination solution.

[0067] like Figure 1 , Figure 2 and Figure 3As shown, this utility model provides a shift fork shaft assembly for a gear shifting actuator. The shift fork shaft assembly includes a shift fork shaft 1, a magnet fixing member 3, and a scraping member 5. The shift fork shaft 1 has a recess 11 on its surface. The magnet fixing member 3 has a magnet 2 inside and is fixed in the recess 11, and has an outer surface 33. The scraping member 5 is disposed within the housing 7 of the gear shifting actuator. The scraping member 5 includes an arc-shaped scraping surface 51, which abuts against the outer surface 33. When the shift fork shaft 1 moves axially, the scraping member 5 scrapes the outer surface 33 of the magnet fixing member 3. This invention combines the use of a magnet fixing component 3 to enclose and isolate the magnet 2 (preventing iron filings from being directly attracted to the magnet 2) with the dynamic scraping of the outer surface 33 of the magnet fixing component 3 by a fixed-position scraping component 5 during the axial movement of the shift fork shaft 1 (the entire scraping action does not require an additional power source). This effectively prevents iron filings from interfering with position detection, ensuring shifting accuracy and reliability. Furthermore, it features a simple structure and low cost. This invention effectively eliminates the problem of contamination of the internal magnet of the shift fork shaft during shaft hole movement. When the shift fork shaft assembly of this invention is used in shifting actuators such as transmissions, it ensures the accuracy of displacement sensor signals and improves the reliability and durability of transmission shifting control.

[0068] In some variations, such as Figure 4 As shown, the scraper 5 also has a connecting part 52 on the side opposite to the shift fork shaft, and the connecting part 52 is integrally formed with the scraping surface 51. In order to ensure that the scraper 5 will not loosen or fall off under the conditions of high-speed reciprocating motion and strong vibration of the shift fork shaft, the connecting part 52 is interference-fitted, snap-fitted or screwed into the preset mounting hole inside the housing 7, but is not limited thereto.

[0069] In some variations, the scraper 5 is made entirely of polytetrafluoroethylene (PTFE). Since PTFE has an extremely low coefficient of friction (static coefficient of friction of about 0.04), the additional motion resistance generated by the scraping action on the shift fork shaft 1 is very small, much smaller than the driving force of the shift actuator, and therefore will not have any perceptible effect on the shifting performance, but this is not a limitation.

[0070] In some variations, the surface of the scraper 5 is provided with a friction-reducing coating, the coefficient of friction of which is in the range of 0.02 to 0.2, but is not limited thereto.

[0071] In some variations, the coating may be made of PTFE material, but this is not a limitation.

[0072] In some variations, recess 11 can be a groove, but is not limited to this.

[0073] In some variations, such as Figure 5 , Figure 6 , Figure 7 As shown ( Figure 7 To facilitate differentiation between the arc-shaped and cylindrical cross-sections of the scraping surface 51, straight lines are used to represent the cylindrical cross-sections, and dashed lines are used to represent the arc-shaped cross-sections of the scraping surface 51. The outer surface 33 of the magnet fixing member 3 (the surface of the magnet fixing member 3 exposed in the recess 11) and the surface of the shift fork shaft 1 are combined to form a cylindrical surface. The arc-shaped and cylindrical surfaces of the scraping surface 51 are in contact with each other, that is, the radius of curvature of the scraping surface 51 is the same as the radius of curvature of the combined outer circle formed after the magnet fixing member 3 is installed on the shift fork shaft 1 (see...). Figure 7 To ensure a good fit, the iron filings adsorbed on the outer surface 33 of the magnet fixing part 3 are dynamically scraped (when the shift fork shaft 1 moves linearly or rotates in each direction, the cross section of the cylindrical surface of the shift fork shaft 1 will not change, so that the iron filings adsorbed on the cylindrical surface will be scraped off by the fixed scraping surface 51), but not limited to this.

[0074] In some variations, the magnet holder 3 has a non-magnetic body portion 34 that encloses the magnet 2, thereby preventing iron filings from being directly attracted to the surface of the magnet 2, but this is not a limitation.

[0075] In some variations, the bottom of the recess 11 is provided with a screw hole 12 and a positioning blind hole 13. The magnet fixing member 3 is provided with a protrusion 32, and the through hole 31 of the magnet fixing member 3 is screwed to the screw hole 12 by a screw 6, and the protrusion 32 is inserted into the positioning blind hole 13, but this is not a limitation.

[0076] In some variations, the central axis of the protrusion 32 passes through the magnet 2 (the protrusion 32 is preferably coaxial with the center line of the magnet 2), thus facilitating precise positioning of the magnet 2 through the engagement of the protrusion 32 with the positioning blind hole 13. This design means that the precise engagement of the protrusion 32 with the positioning blind hole 13 not only fixes the magnet fixing component 3 itself, but also directly and accurately positions the radial and circumferential positions of the magnet 2 on the shift fork shaft 1. This is crucial for ensuring that the magnetic field center position read by the displacement sensor strictly corresponds to the actual geometric position of the shift fork shaft, thereby enhancing the accuracy and consistency of shifting actions, but is not a limitation thereof.

[0077] In some variations, the shift fork shaft assembly may also include at least one shift fork 4 mounted on the shift fork shaft, but this is not a limitation.

[0078] In some variations, the magnet retainer 3 fills the recess 11 to prevent iron filings from entering the recess 11, but this is not a limitation.

[0079] In some variations, the magnet retainer 3 is fitted or bonded to the recess 11. This method allows the magnet retainer 3 to be removed directly with tools without disassembling the shift fork shaft, thus facilitating inspection or replacement of the magnet retainer 3, but is not limited thereto.

[0080] In some variations, the magnet fixing member 3 is bonded to the recess 11. The magnet fixing member 3 can be fixed in the recess 11 by bonding with a high-strength adhesive to ensure that it will not fall off during high-speed reciprocating motion, but this is not a limitation.

[0081] In some variations, the shift fork shaft assembly also includes a sensor that interacts with the magnet, which can detect changes in the magnetic field of the magnet to determine the axial position of the shift fork shaft, but is not limited thereto.

[0082] In some variations, the sensor is a Hall sensor, but this is not a limitation.

[0083] This invention can solve the technical problems in the prior art where iron filings are attracted due to magnet exposure, resulting in distortion of displacement detection signals and jamming of the shift fork shaft; furthermore, through structural improvements, it can actively scrape off contaminants that may adhere to the surface of the magnet protective cover, keeping the detection area clean.

[0084] Continue to refer to Figure 1 and Figure 2 This utility model also provides a shifting actuator, including: the shift fork shaft assembly as described above, and the relevant technical features are as previously stated, and will not be repeated here. Due to the use of the shift fork shaft assembly, the shifting actuator of this utility model can effectively prevent contamination of the internal magnet of the shift fork shaft during shaft hole movement, ensure the accuracy of the displacement sensor signal, and improve the reliability and durability of the transmission shifting control.

[0085] The shifting actuator of this utility model can effectively prevent iron filings while not increasing the running resistance of the shift fork shaft, ensuring the smoothness of shifting operation. Furthermore, it is a simple, easy-to-assemble, low-cost, and highly reliable solution for preventing iron filings interference.

[0086] The working principle of the shift actuator of this utility model is as follows:

[0087] The shifting actuator of this utility model includes a housing 7, which is typically cast from materials such as aluminum alloy. A support hole is provided inside the housing 7, and the shift fork shaft 1 can reciprocate along its axial direction via a linear bearing or directly engaging with the support hole. One end of the shift fork shaft 1 (not shown in the figure) is fixedly connected to a shift fork 4 for actuating the synchronizer.

[0088] A recess 11 is machined in the middle of the side wall of the shift fork shaft 1. The recess 11 is preferably a blind groove structure, with a screw hole 12 and a positioning blind hole 13 at its bottom. The screw hole 12 is used to fasten the screw, and the positioning blind hole 13 is used for precise positioning.

[0089] The magnet fixing component 3 consists of a magnet 2 (which can be a permanent magnet) and a body 34. The magnet 2 is preferably made of high-performance permanent magnet materials such as neodymium iron boron. The body 34 completely encapsulates the magnet 2 using a plastic coating process, forming a single integral component. The plastic coating material can be high-strength, oil-resistant, and high-temperature-resistant engineering plastics such as PPS (polyphenylene sulfide) and PA66 (nylon 66). The shape of the magnet fixing component 3 matches the recess 11, and its dimensions are designed so that it completely fills the recess 11 when installed, and its outer surface 33 is flush with the original outer cylindrical surface of the shift fork shaft 1, together forming a smooth, continuous cylindrical guide surface.

[0090] The magnet fixing component 3 has a through hole 31 and a protrusion 32. During installation, the protrusion 32 is first inserted into the positioning blind hole 13 on the shift fork shaft 1 to achieve pre-positioning in both the circumferential and radial directions. Then, a screw 6 passes through the through hole 31 and is screwed into the screw hole 12 of the shift fork shaft 1 to securely fasten the magnet fixing component 3 to the shift fork shaft 1. The central axis of the protrusion 32 is preferably designed to pass through the geometric center of the magnet 2, which helps to ensure the accuracy of the magnetic pole direction during assembly.

[0091] The scraping component 5 is integrally injection molded from polytetrafluoroethylene (PTFE) material with an extremely low coefficient of friction. Its structure mainly consists of two parts: an arc-shaped scraping surface 51 and a cylindrical connecting part 52. The radius of curvature of the scraping surface 51 is the same as the radius of curvature of the combined outer circle formed after the magnet fixing component 3 is installed on the shift fork shaft 1, ensuring a good fit. The scraping component 5 is pressed into a specially opened mounting hole on the housing 7 through its connecting part 52 with an interference fit. After installation, the scraping surface 51 of the scraping component 5, under its own elastic deformation, presses against the outer surface 33 of the magnet fixing component 3 with slight pressure.

[0092] When the transmission is operating, the shift fork shaft 1 moves axially under the drive of a drive unit (such as a motor). A Hall sensor (not shown in the figure, usually mounted radially near the magnet holder 3) fixed to the housing 7 detects changes in the magnetic field of the magnet 2. Simultaneously, the stationary scraper 5 uses its scraping surface 51 to continuously scrape the outer surface 33 of the magnet holder 3 beneath it. Any iron filings or oil stains attempting to adhere to this surface are promptly scraped off and fall off, preventing accumulation. Because the PTFE material of the scraper 5 has an extremely low coefficient of friction (static coefficient of friction approximately 0.04), the additional motion resistance generated by the scraping action on the shift fork shaft 1 is very small, far less than the driving force of the shift actuator, and therefore has no perceptible impact on shifting performance.

[0093] In summary, the shift fork shaft assembly and shifting actuator of this utility model can effectively prevent iron filings from interfering with position detection by combining encapsulation isolation and dynamic scraping, thus ensuring shifting accuracy and reliability. Moreover, the structure is simple and the cost is low.

[0094] The above description, in conjunction with specific optional embodiments, provides a further detailed explanation of this utility model. It should not be construed that the specific implementation of this utility model is limited to these descriptions. For those skilled in the art, various simple deductions or substitutions can be made without departing from the concept of this utility model, and all such modifications or substitutions should be considered within the protection scope of this utility model.

Claims

1. A shift fork shaft assembly for a gear shifting actuator, characterized in that, The shift fork shaft assembly includes: A shift fork shaft (1), the surface of which is provided with a recess (11); A magnet fixing member (3) containing a magnet (2), the magnet fixing member (3) being fixed in the recess (11), and the magnet fixing member (3) having an outer surface (33); and A scraping component (5) is disposed inside the housing (7) of the shifting actuator. The scraping component (5) includes an arc-shaped scraping surface (51). The scraping surface (51) is attached to the outer surface (33). When the shift fork shaft (1) moves axially, the scraping component (5) scrapes the outer surface (33) of the magnet fixing component (3).

2. The shift fork shaft assembly according to claim 1, characterized in that, The outer surface (33) of the magnet fixing member (3) and the surface of the shift fork shaft (1) are joined together to form a cylindrical surface. The arc surface of the scraping surface (51) is in contact with the cylindrical surface to scrape the iron filings adsorbed on the outer surface (33) of the magnet fixing member (3).

3. The shift fork shaft assembly according to claim 1, characterized in that, The magnet fixing member (3) has a non-magnetic body part (34) that encloses the magnet (2).

4. The shift fork shaft assembly according to claim 1, characterized in that, The bottom of the recess (11) is provided with a screw hole (12) and a positioning blind hole (13); The magnet fixing member (3) is provided with a protrusion (32), and the magnet fixing member (3) is screwed into the screw hole (12) by a screw (6), and the protrusion (32) is inserted into the positioning blind hole (13).

5. The shift fork shaft assembly according to claim 1, characterized in that, The shift fork shaft assembly also includes at least one shift fork (4) mounted on the shift fork shaft.

6. The shift fork shaft assembly according to claim 1, characterized in that, The magnet fixing member (3) fills the recess (11).

7. The shift fork shaft assembly according to claim 1, characterized in that, The magnet fixing member (3) is fitted into the recess (11).

8. The shift fork shaft assembly according to claim 1, characterized in that, The scraping component (5) also has a connecting part (52) on the side opposite to the shift fork shaft. The connecting part (52) is integrally formed with the scraping surface (51) and the connecting part (52) is fixed in the housing (7).

9. The shift fork shaft assembly according to claim 8, characterized in that, The scraping surface of the scraping component (5) is provided with a friction-reducing coating.

10. The shift fork shaft assembly according to claim 1, characterized in that, The shift fork shaft assembly also includes a sensor that works in conjunction with the magnet, the sensor being able to detect changes in the magnetic field of the magnet to determine the axial position of the shift fork shaft.

11. The shift fork shaft assembly according to claim 10, characterized in that, The sensor is a Hall sensor.

12. A gear shifting actuator, characterized in that, The shifting actuator includes a shift fork shaft assembly according to any one of claims 1 to 11.

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