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 piece containing magnet, magnet fixing piece is fixed in the recess; a non -magnetic protective cover, with the recess is surrounded and forms the cavity of encapsulating magnet fixing piece. The utility model can reduce the gear shifting condition, the iron fillings are adsorbed in the magnet surface or its surrounding gap of fork axle, prevent the iron fillings influence the gear shifting precision and reliability of the gear shifting of fork axle assembly.

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), the position of the shift forks needs to be monitored in real time to precisely control the shifting process. A common practice is to place a magnet (such as a permanent magnet) on the shift fork shaft that drives the shift fork's axial movement, and to install a displacement sensor (such as a Hall effect sensor) on a fixed housing. When the shift fork shaft moves the magnet, the displacement sensor detects changes in the magnetic field to determine the precise position of the shift fork and transmits the signal to the transmission control unit (TCU).

[0003] In existing technology, as shown in conventional designs, magnets are typically fixed to the recess of the shift fork shaft using screws or similar methods. This structure exposes the magnet directly within the internal space of the transmission housing. During long-term operation, wear on moving parts such as gears and synchronizers generates fine metal shavings. Due to the magnet's inherent magnetism, these shavings are easily attracted to its surface or the gaps around it.

[0004] Moreover, this iron filings contamination can have serious negative effects: First, the iron filings adhering to the magnet surface alter the surrounding magnetic field distribution, causing distortion, drift, or instability in the signals detected by the displacement sensor; second, severe iron filings accumulation can even obstruct the movement of the shift fork shaft within the housing's support hole, resulting in jamming. Both of these situations directly affect the shifting accuracy and reliability of the transmission, and may even lead to malfunctions.

[0005] 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

[0006] 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 or the gap around it during current shifting operations.

[0007] This utility model provides a shift fork shaft assembly, including:

[0008] A shift fork shaft, wherein a groove is provided on the surface of the shift fork shaft;

[0009] A magnet fixing member containing a magnet, the magnet fixing member being fixed within the groove; and

[0010] A non-magnetic protective cover, together with the groove, forms a cavity for encapsulating the magnet fixing component.

[0011] In some embodiments, the outer surface of the non-magnetic protective cover is shaped according to the shape of the part on the shift fork shaft where the magnet fixing part is installed, and the interior of the non-magnetic protective cover forms a cavity that matches the outer contour of the groove of the shift fork shaft and the protruding part of the magnet fixing part.

[0012] In some embodiments, the outer surface of the non-magnetic protective cover has a cylindrical surface that at least partially mates with the fork shaft.

[0013] In some embodiments, the non-magnetic protective cover is elastically deformable, and the diameter of the cylindrical surface of the non-magnetic protective cover is larger than the diameter of the shift fork shaft in a tolerant fit sense. Advantageously, the hardness of the non-magnetic protective cover is in the range of 30 to 50 IRHD.

[0014] In some embodiments, the non-magnetic protective cover is made of closed-cell foamed rubber material.

[0015] In some embodiments, the inner surface of the non-magnetic protective cover is at least partially fitted to and bonded to the groove of the shift fork shaft and / or the magnet fixing member.

[0016] In some embodiments, the non-magnetic protective cover is interference-fitted with or engages with the outer surface of the magnet fixing member.

[0017] In some embodiments, the non-magnetic protective cover is fitted into a groove in the shift fork shaft.

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

[0019] The magnet fixing component includes a main body and a screw lug extending from the main body. The magnet is disposed in the inner cavity of the main body. The bottom surface of the main body is provided with a protrusion that engages with the positioning blind hole. The screw lug is screwed into the screw hole by a bolt.

[0020] In some embodiments, the non-magnetic protective cover has a first groove and a second groove that are connected to each other inside. The inner wall of the first groove matches the body portion, and the inner wall of the second groove matches the screw lug that is screwed by the bolt.

[0021] In some embodiments, the shift fork shaft assembly further includes at least one shift fork mounted on the shift fork shaft.

[0022] This utility model also provides a shifting actuator, which includes the shift fork shaft assembly described above and a sensor that works in conjunction with a magnet of the shift fork shaft assembly. The sensor can detect changes in the magnetic field of the magnet to determine the axial position of the shift fork shaft.

[0023] In some embodiments, the sensor is a Hall sensor.

[0024] In some embodiments, a support hole is provided in the housing of the shift actuator. After the non-magnetic protective cover is deformed by compression, it passes through the support hole together with the shift fork shaft and then elastically restores its original shape. The non-magnetic protective cover and the groove together form a cavity for encapsulating the magnet fixing member, thereby sealing and isolating the magnet fixing member from the internal environment of the housing.

[0025] The beneficial effects of this application compared to the prior art include at least the following:

[0026] 1. Effective pollution prevention: By setting a non-magnetic protective cover, the magnet is completely covered and sealed, which fundamentally blocks the path of contaminants such as iron filings to directly contact the magnet and eliminates the problem of magnetic field interference caused by the adsorption of iron filings.

[0027] 2. Improved detection reliability: It ensures the stability of the magnetic field around the magnet, enabling the displacement sensor to obtain continuous and accurate position signals, which greatly improves the accuracy and reliability of transmission shift control.

[0028] 3. Enhanced durability: Reduces the potential risk of jamming in moving parts and extends the service life of the shift fork shaft assembly and related sensors.

[0029] 4. Simple structure and strong versatility: As an independent additional component, this non-magnetic protective cover can be widely used in various shift fork shaft structures that use exposed magnets for fixing. It does not require changes to the main design of the shift fork shaft and housing, resulting in low modification costs and easy implementation.

[0030] 5. Easy installation and maintenance: Utilizing the elastic compressibility of the non-magnetic protective cover material, the non-magnetic protective cover can be compressed and smoothly pass through the support hole of the housing when assembling the shift fork shaft, making installation convenient. If it is necessary to replace the magnet or the non-magnetic protective cover, only this independent component needs to be removed.

[0031] This utility model provides a shift fork shaft assembly and a shift actuator that can effectively isolate the magnet from the external environment, prevent contaminants such as iron filings from adsorbing onto the magnet, thereby ensuring the accuracy of the displacement sensor signal and improving the reliability and durability of the transmission shift control.

[0032] 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

[0033] 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.

[0034] Figure 1 This is a schematic diagram of the structure of a shift fork shaft assembly provided in an embodiment of this application;

[0035] Figure 2 This is a schematic diagram of the structure of a shift fork shaft assembly without a non-magnetic protective cover provided in an embodiment of this application;

[0036] Figure 3 This is another structural schematic diagram of a shift fork shaft assembly provided in an embodiment of this application;

[0037] Figure 4 This is a schematic diagram of a shift fork shaft assembly operating within a shift actuator, as provided in an embodiment of this application.

[0038] Figure 5 yes Figure 4 A magnified view of region A in the middle.

[0039] Figure 6 yes Figure 5 Schematic diagram of the structure of the central magnet fixing component;

[0040] Figure 7 yes Figure 5 Another structural schematic diagram of the central magnet fixing component;

[0041] Figure 8 yes Figure 5 Another structural schematic diagram of the central magnet fixing component;

[0042] Figure 9 yes Figure 5 Schematic diagram of the structure of the central magnet fixing component;

[0043] Figure 10 yes Figure 5 Another structural schematic diagram of the central magnet fixing component;

[0044] Figure 11 yes Figure 5 Another structural schematic diagram of the central magnet fixing component.

[0045] Figure label:

[0046] 1. Shift fork shaft

[0047] 2 grooves

[0048] 21 screw holes

[0049] 22 Positioning blind hole

[0050] 3 Magnet fixing components

[0051] 30 Body part

[0052] 31. Inner cavity

[0053] 32 Magnets

[0054] 33 Screw-in lug

[0055] 34 convex pillars

[0056] 4. Shift fork

[0057] 5. Non-magnetic protective cover

[0058] 51 Outer surface

[0059] 52 First Groove

[0060] 53 Second Groove

[0061] 6 bolts

[0062] 10. Shell 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 for widely existing structures where magnets are fixed to the surface of a shift fork shaft or within a shallow groove, there is currently a lack of an effective and universal solution to prevent iron filings from contaminating the structure, thereby ensuring the long-term stability and reliability of displacement detection. Traditional solutions often involve embedding the magnet in a blind hole machined inside the shift fork shaft, hoping to provide physical isolation through the shaft itself. However, this method has significant limitations: firstly, it is unsuitable for solid shift fork shafts with high structural strength requirements and where machining deep holes is inconvenient; secondly, blind hole machining increases the complexity and cost of the manufacturing process; and thirdly, even with an embedded magnet, if the seal is not tight, fine iron filings can still infiltrate, and once infiltrated, cleaning is extremely difficult. Currently, the industry generally lacks an efficient and universal anti-contamination solution for structures where magnets are directly fixed to the surface of the shift fork shaft or within a shallow groove.

[0067] like Figure 1 , Figure 2 and Figure 3 As shown, this utility model provides a shift fork shaft assembly, including: a shift fork shaft 1, a magnet fixing member 3, and a non-magnetic protective cover 5. Specifically, a groove 2 is provided on the surface of the shift fork shaft 1. The magnet fixing member 3, containing a magnet 32, is fixed in the groove 2. The non-magnetic protective cover 5 and the groove 2 together form a cavity encapsulating the magnet fixing member 3. In this utility model, since the magnet is not built into the shaft body, it can be applied to solid shafts or shift fork shaft structures that are not suitable for machining blind holes. Moreover, the protective cavity formed by the non-magnetic protective cover 5 and the groove 2 effectively isolates the magnet fixing member 3 from the external working environment, effectively preventing the problem of contamination of the magnet inside the shift fork shaft during shaft hole movement. When the shift fork shaft assembly of this utility model is used in shift actuators such as transmissions, it can ensure the accuracy of displacement sensor signals and improve the reliability and durability of transmission shift control.

[0068] In some embodiments, such as Figures 4 to 8 As shown, the groove 2 of this utility model is provided with a screw hole 21 and a positioning blind hole 22. The magnet fixing component 3 includes a body part 30 and a screw lug 33 extending from the body part. The magnet 32 ​​is disposed in the inner cavity 31 2 of the body part 30. The bottom surface of the body part 30 is provided with a protrusion 34 that engages with the positioning blind hole 22. The screw lug 33 is screwed into the screw hole 21 by a bolt 6. This combination of "positioning and fastening" of the screw hole 21 and the positioning blind hole 22 greatly simplifies the process of installing the magnet fixing component 3 into the groove 2, reduces adjustment time, improves assembly efficiency, and ensures consistency in repeated installations.

[0069] In some embodiments, the central axis of the protrusion 34 passes through the magnet 32 ​​(the protrusion 34 is preferably coaxial with the center line of the magnet 32), thereby facilitating precise positioning of the magnet 32 ​​through the engagement of the protrusion 34 with the positioning blind hole 22. This design means that the precise engagement of the protrusion 34 with the positioning blind hole 22 not only fixes the magnet fixing member 3 itself, but also directly and accurately positions the radial and circumferential positions of the magnet 32 ​​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 the shifting action. However, this is not a limitation.

[0070] In some embodiments, considering that the shift fork shaft needs to perform high-speed, reciprocating axial movement in the support hole of the shift actuator, any unnecessary protrusions may cause interference, vibration, or wear. Therefore, in a key design of this invention, the magnet fixing member 3 is disposed within the space defined by the groove 2 of the shift fork shaft 1. That is, after the magnet fixing member 3 is installed, its outer surface will not protrude beyond the theoretical cylindrical outer surface of the shift fork shaft 1 itself. This flattened design effectively avoids interference of the magnet fixing member on the movement trajectory of the shift fork shaft, ensuring smooth movement, but is not limited thereto.

[0071] In some embodiments, such as Figures 9 to 11 As shown, the outer surface 51 of the non-magnetic protective cover 5 is shaped according to the shape of the part on the shift fork shaft 1 where the magnet fixing member 3 is installed. The interior of the non-magnetic protective cover 5 forms a cavity that matches the outer contour of the groove of the shift fork shaft 1 and the protruding part of the magnet fixing member 3, so that it can be tightly fitted on the shift fork shaft 1 and completely enclose the magnet fixing member 3, but this is not the limitation.

[0072] In some variations, the outer surface 51 of the non-magnetic protective cover 5 is not a simple cylindrical surface, but rather a contour-following design based on the final outline of the part on the shift fork shaft 1 where the magnet fixing member 3 is mounted. The interior of the non-magnetic protective cover 5 forms a cavity that perfectly matches the outer outline of the shift fork shaft 1 and any slight protrusion of the magnet fixing member 3. This allows the non-magnetic protective cover 5 to fit snugly onto this part of the shift fork shaft 1 like a custom-made helmet, completely and snugly encasing the magnet fixing member 3 without gaps, minimizing, but not limited to, any potential areas where contaminants may accumulate or intrude.

[0073] In some embodiments, to achieve effective installation and continuous sealing during operation, the non-magnetic protective cover 5 undergoes elastic deformation under external force. The diameter of the cylindrical surface of the non-magnetic protective cover 5 is larger than the diameter of the shift fork shaft 1 in terms of tolerance fit. The outer surface 51 of the non-magnetic protective cover 5 has a cylindrical surface that at least partially mates with the shift fork shaft 1. During installation, the non-magnetic protective cover 5 is slightly squeezed to cause elastic deformation, allowing it to pass smoothly through the support hole inside the shift actuator. After installation, the non-magnetic protective cover 5 recovers elastically, and its outer cylindrical surface forms a tight fit or a very small clearance fit with the inner wall of the support hole, greatly preventing iron filings from entering the area where the magnet is located, but this is not a limitation.

[0074] In some embodiments, the non-magnetic protective cover 5 is preferably made of closed-cell foamed rubber material, which has good elasticity, compressibility and a certain degree of abrasion resistance. The hardness range of the non-magnetic protective cover 5 is 30 to 50 IRHD, but is not limited thereto.

[0075] To ensure that the non-magnetic protective cover 5 will not loosen or fall off under conditions of high-speed reciprocating motion and strong vibration of the shift fork shaft, in addition to relying on the friction of the interference fit, adhesive reinforcement can also be used:

[0076] In some embodiments, the inner surface of the non-magnetic protective cover 5 is at least partially fitted and bonded to the groove of the shift fork shaft 1 and / or the magnet fixing member 3. The non-magnetic protective cover 5 can be fixed to the surface of the magnet fixing member 3 or the shift fork shaft 1 by bonding with a high-strength adhesive, ensuring that it will not fall off during high-speed reciprocating motion. This dual fixing strategy of "mechanical clamping + chemical bonding" greatly improves the reliability of protection, but is not limited thereto.

[0077] In some embodiments, to achieve optimal fit with the complex shape of the magnet fastener 3, the internal cavity of the non-magnetic protective cover 5 can be further refined into a first groove 52 and a second groove 53 that are interconnected. The inner wall shape of the first groove 52 matches the body portion 30 of the magnet fastener 3 and is used to wrap the main body portion; the inner wall of the second groove 53 matches the shape of the screw lug 33 and the head of the bolt 6 thereon. This segmented contouring design makes the wrapping of the non-magnetic protective cover 5 more precise and tight, further eliminating internal gaps.

[0078] Furthermore, considering ease of maintenance, this utility model also provides other connection methods between the non-magnetic protective cover 5 and the magnet fixing member 3 or the groove 2:

[0079] In one variation, the non-magnetic protective cover 5 may be connected to the outer surface of the magnet retainer 3 by an interference fit or a snap-fit ​​connection. This method allows the non-magnetic protective cover 5 to be removed directly with tools without disassembling the shift fork shaft, thereby facilitating the inspection or replacement of the internal magnet retainer 3 or magnet 32, but is not limited thereto.

[0080] In one variation, the non-magnetic protective cover 5 can also be designed to fit directly into a specific structure (such as a slot or flange) at the edge of the groove 2 of the shift fork shaft 1. This fitting connection also provides the possibility of quick opening and closing, facilitating maintenance, but is not limited to this.

[0081] In one variation, a plurality of shift forks 4 are provided at one end of the shift fork shaft 1. The shift forks 4 in this invention can be used to convert the driver's shifting intention (via the shift lever) or the instructions of the electronic control unit into specific actions in the gearbox, thereby driving the gears to move, thereby changing the transmission ratio and realizing gear shifting, but are not limited thereto.

[0082] The core of this invention lies in providing an integrated magnet fixing and sealing protection structure. It cleverly combines a magnet fixing component, a groove structure, and a dedicated non-magnetic protective cover to form a sealed cavity that effectively isolates external contaminants. This solution not only successfully solves the problem of magnet contamination prevention but also possesses excellent versatility because it does not rely on deep hole machining inside the shaft body. It can be widely applied to solid shafts or various shift fork shaft structures unsuitable for built-in magnets.

[0083] Continue to refer to Figure 4 and Figure 5 This utility model also provides a shifting actuator, including: a shift fork shaft assembly as described above, and a sensor that interacts with a magnet in the shift fork shaft assembly. The sensor can detect changes in the magnetic field of the magnet to determine the axial position of the shift fork shaft. The relevant technical features are as described above and will not be repeated here. Because this utility model's shifting actuator uses the aforementioned shift fork shaft assembly, it 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.

[0084] In one variation, the sensor is a Hall sensor, but this is not a limitation.

[0085] In some embodiments, a support hole is provided in the housing 10 of the shift actuator. After the non-magnetic protective cover 5 is deformed by compression, it passes through the support hole together with the shift fork shaft 1 and elastically restores its original shape. The non-magnetic protective cover 5 and the groove 2 together form a cavity for encapsulating the magnet fixing member 3, which seals and isolates the magnet fixing member 3 from the internal environment of the housing 10, but this is not a limitation.

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

[0087] (1) Component Assembly: First, the assembly of the shift fork shaft assembly is completed. The shift fork shaft assembly of this utility model includes: a shift fork shaft 1, several shift forks 4, a magnet fixing member 3, and a non-magnetic protective cover 5. Several shift forks 4 are provided at one end of the shift fork shaft 1, and a groove 2 is provided on the surface of the shift fork shaft 1. The magnet fixing member 3, which contains a magnet 32, is fixed in the groove 2. First, the positioning blind hole 22 in the groove 2 is accurately engaged by the protrusion 34, and then the screw lug 33 is screwed into the screw hole 21 with the bolt 6 to fix the magnet fixing member 3, which contains a magnet 32, in the groove 2 of the shift fork shaft 1 (at this time, the outer surface of the magnet fixing member 3 is exposed in the groove 2). Then, the inner surface of the non-magnetic protective cover 5 is bonded to the outer surface of the magnet fixing member 3, and the non-magnetic protective cover 5 and the groove 2 together form a cavity for encapsulating the magnet fixing member 3. The non-magnetic protective cover 5 is an externally mounted cover with elastic deformation. The diameter of the cylindrical surface of the non-magnetic protective cover 5 is slightly larger than the diameter of the shift fork shaft 1. The outer surface 51 of the non-magnetic protective cover 5 exposed in the groove 2 has a cylindrical surface that at least partially mates with the shift fork shaft 1. At this time, the protective cavity formed by the non-magnetic protective cover 5 and the groove 2 effectively isolates the magnet fixing component 3 from the external working environment, effectively preventing the problem of contamination of the magnet inside the shift fork shaft during shaft hole movement.

[0088] (2) Assembly Installation and Sealing Formation: In its free state, the diameter of the cylindrical surface of the non-magnetic protective cover 5 is designed to be slightly larger than the diameter of the shift fork shaft 1 body and also slightly larger than the inner diameter of the support hole on the shift actuator housing 10 through which it will pass. During the installation of the shift fork shaft assembly, the non-magnetic protective cover 5 is first subjected to compression, resulting in controllable elastic deformation, which temporarily reduces its outer diameter, allowing it to pass smoothly through the support hole of the housing along with the shift fork shaft 1. After the shift fork shaft assembly is installed in place, the compressive force applied to the non-magnetic protective cover 5 disappears, and the non-magnetic protective cover returns to its original or near-original shape due to the elasticity of its material. At this time, the outer cylindrical surface of the non-magnetic protective cover 5 forms a tight fit with the inner wall of the support hole, or at least a fit with a very small gap. This dynamic tight fit greatly hinders the flow of oil or air containing iron filings from the gap in the support hole into the area where the magnet is located, forming an effective "dynamic seal" barrier.

[0089] (3) Shift fork shaft operation and sensor detection: When the shift command is issued, when the shift fork shaft of this utility model moves axially in the support hole in the housing 10 of the shift actuator under the drive of the drive device (such as servo motor, cylinder, etc.), the magnet fixing part 3 (containing magnet 32) which is tightly protected by the non-magnetic protective cover 5 moves synchronously.

[0090] (4) Shift signal sensing and processing: A displacement sensor (such as a Hall sensor, not shown in the figure) fixedly installed on the housing 10, corresponding to the position of the magnet 32's movement trajectory, continuously detects the magnetic field changes caused by the movement of the magnet 32 ​​through a non-magnetic protective cover 5 made of non-magnetic material (such as the aforementioned rubber). Since the non-magnetic protective cover 5 effectively prevents iron filings from contaminating the magnet, the magnetic field strength and distribution of the magnet 32 ​​remain highly stable (effectively avoiding interference from the Hall sensor's detection signal caused by the movement of iron filings embedded in the groove 2 with the magnet 32).

[0091] (5) Achieve precise shift control (without metal filings interference): The displacement sensor transmits the detected signal, which accurately reflects the true position of the shift fork 4 and the shift fork shaft 1, to the transmission control unit (TCU) in real time. Based on the comparison between this signal and the target gear signal, the TCU precisely controls the drive unit to ensure that the shifting action is completed accurately and smoothly.

[0092] This utility model's shift actuator effectively isolates the magnet from the internal environment of the transmission by adding a non-magnetic protective cover, preventing contaminants such as iron filings from adhering to the magnet surface. This ensures the accuracy of the displacement sensor's detection signal, thereby improving the reliability and durability of the transmission's shift control. It features a simple structure, strong versatility, and easy installation.

[0093] In summary, the shift fork shaft assembly and shifting actuator of this invention can effectively isolate the magnet from the external environment, prevent contaminants such as iron filings from adsorbing onto the magnet, thereby ensuring the accuracy of the displacement sensor signal and improving the reliability and durability of the transmission shifting control.

[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, characterized in that, include: A shift fork shaft (1), the surface of which is provided with a groove (2); A magnet fixing member (3) containing a magnet (32), the magnet fixing member (3) being fixed within the groove (2); and A non-magnetic protective cover (5) surrounds the groove (2) to form a cavity for encapsulating the magnet fixing member (3).

2. The shift fork shaft assembly according to claim 1, characterized in that, The outer surface (51) of the non-magnetic protective cover (5) is modeled according to the shape of the part on the fork shaft (1) where the magnet fixing part (3) is installed. The interior of the non-magnetic protective cover (5) forms a cavity that matches the outer contour of the groove of the fork shaft (1) and the protruding part of the magnet fixing part (3).

3. The shift fork shaft assembly according to claim 2, characterized in that, The outer surface (51) of the non-magnetic protective cover (5) has a cylindrical surface that is at least partially fitted with the fork shaft (1).

4. The shift fork shaft assembly according to claim 3, characterized in that, The non-magnetic protective cover (5) is elastically deformable, and the diameter of the cylindrical surface of the non-magnetic protective cover (5) is larger than the diameter of the shift fork shaft (1) in terms of tolerance fit.

5. The shift fork shaft assembly according to claim 1, characterized in that, The inner surface of the non-magnetic protective cover (5) is at least partially attached to and bonded to the groove of the fork shaft (1) and / or the magnet fixing member (3).

6. The shift fork shaft assembly according to claim 1, characterized in that, The non-magnetic protective cover (5) is interference-fitted or snapped onto the outer surface of the magnet fixing member (3).

7. The shift fork shaft assembly according to claim 1, characterized in that, The non-magnetic protective cover (5) is fitted into the groove (2) of the shift fork shaft (1).

8. The shift fork shaft assembly according to claim 1, characterized in that, The groove (2) is provided with a screw hole (21) and a positioning blind hole (22); The magnet fixing component (3) includes a body part (30) and a screw lug (33) extending from the body part. The magnet (32) is disposed in the inner cavity (31) of the body part (30). The bottom surface of the body part (30) is provided with a protrusion (34) that engages with the positioning blind hole (22). The screw lug (33) is screwed into the screw hole (21) by a bolt (6).

9. The shift fork shaft assembly according to claim 8, characterized in that, The non-magnetic protective cover (5) has a first groove (52) and a second groove (53) that are connected inside. The inner wall of the first groove (52) matches the body part (30), and the inner wall of the second groove (53) matches the screw lug (33) that is screwed by the bolt (6).

10. 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.

11. The shift fork shaft assembly according to claim 1, characterized in that, The non-magnetic protective cover is made of closed-cell foamed rubber material.

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 and a sensor that interacts with a magnet of the shift fork shaft assembly, the sensor being capable of detecting changes in the magnetic field of the magnet to determine the axial position of the shift fork shaft.

13. The gear shifting actuator according to claim 12, characterized in that, The sensor is a Hall sensor.

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