Piston main box with rotation stopping function and gear shifting executing mechanism
By introducing an anti-rotation structure into the piston main box to prevent the magnetic unit from rotating relative to the piston rod, the problem of piston displacement signal mismatch is solved, achieving stable operation of the shift actuator and extending the service life of parts.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SHAANXI FAST GEAR CO LTD
- Filing Date
- 2025-06-13
- Publication Date
- 2026-05-12
AI Technical Summary
In existing technology, the relative rotation of the magnet on the piston with respect to the piston rod causes a mismatch between the displacement value signal and the actual displacement, resulting in gear shifting failure.
The piston main box design with anti-rotation function is adopted. The anti-rotation structure of the main box large piston and the piston shift fork shaft is connected. Combined with fasteners and sealant, it prevents the magnetic unit from rotating relative to the piston rod, ensuring that the displacement sensor obtains accurate displacement values.
It effectively prevents displacement signal deviation, ensures the normal operation of the shifting actuator, improves the stability and reliability of equipment operation, extends the life of parts, and reduces maintenance costs.
Smart Images
Figure CN224229221U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the technical field of shifting actuators, specifically relating to a piston master box with anti-rotation function and a shifting actuator. Background Technology
[0002] In the automotive and related mechanical transmission fields, the rapid development of intelligent products has placed higher demands on the performance of core components. As a key core component in intelligent products, the performance of the gear shift actuator directly affects the operation of the entire system. The main indicators for evaluating the performance of the gear shift actuator include whether it can perform the gear shifting function normally and the smoothness of gear shifting. The correct feedback of the cylinder piston displacement value of the gear shift actuator is the key determining factor for its normal gear shifting function.
[0003] In practical applications, the inability of actuators to engage gears is a common problem. However, research has found that in many cases, the issue is not due to damage to internal components such as pistons or solenoid valves, but rather because the displacement sensor is sending incorrect displacement values to the controller. When the controller receives an incorrect displacement signal, it mistakenly interprets this as the cylinder piston failing to reach the target position, thus causing the gear engagement failure.
[0004] The working principle of the displacement sensor to obtain the piston displacement value does not rely directly on the position information of the piston itself. Instead, it acquires data by sensing the number and direction of the magnetic field lines generated by the magnet on the piston. Then, it converts these data into corresponding values for output. However, this working method has a potential problem: when the magnet on the piston rotates relative to the piston rod, the displacement value signal read by the displacement sensor will not match the actual displacement of the piston. This mismatch will cause the information received by the controller to deviate, ultimately causing gear engagement failure and seriously affecting the normal operation and efficiency of the equipment. Utility Model Content
[0005] The purpose of this utility model is to provide a piston master box and shifting actuator with anti-rotation function, so as to solve the technical defect in the prior art, where the displacement value signal does not match the actual displacement due to the relative rotation of the magnet on the piston relative to the piston rod, which leads to the failure of shifting.
[0006] To achieve the above objectives, the present invention adopts the following technical solution:
[0007] Firstly, a piston master box with anti-rotation function is provided, including:
[0008] The main piston is connected to the main piston fork shaft via an anti-rotation structure.
[0009] The gear selector is connected to the end of the main housing piston fork shaft and is perpendicular to the axis of the main housing piston fork shaft;
[0010] The main box piston sealing ring is located at both ends of the outer side of the main box large piston;
[0011] The magnetic unit is installed in the mounting groove on the outside of the main piston and is located between the two main piston sealing rings. The outer wall of the magnetic unit is fitted with a main piston support ring.
[0012] Furthermore, the anti-rotation structure includes:
[0013] The keyway is located on the inner wall of the main piston.
[0014] A pin is located at the end of the main housing piston fork shaft away from the gear selector head and is perpendicular to the axis of the main housing piston fork shaft. The pin is movably connected to the keyway.
[0015] Furthermore, the anti-rotation structure also includes:
[0016] Fasteners are installed in the main piston of the main housing, and their ends extend to the outside of the main piston of the main housing and are fixedly connected to the piston fork shaft of the main housing.
[0017] Furthermore, a sealant is provided on the end of the fastener that is in contact with the inner wall of the main piston.
[0018] Furthermore, the fastener is an internal hexagonal head screw.
[0019] Furthermore, the magnetic unit is bonded to the mounting groove.
[0020] Furthermore, the magnetic unit is the main housing large piston magnet.
[0021] Furthermore, the gear selector is connected to the main housing piston fork shaft via a helical elastic pin.
[0022] Furthermore, the main piston of the main chamber has a hollow structure inside, and the piston fork shaft of the main chamber is disposed in the hollow structure and is axially coincident with the main piston of the main chamber.
[0023] Secondly, a shifting actuator is provided, including a piston masterbox with anti-rotation function as described above.
[0024] Compared with the prior art, the present invention has the following beneficial effects:
[0025] 1. The main piston and the main piston shift fork shaft are connected by an anti-rotation structure, which effectively prevents the magnetic unit from rotating relative to the piston rod. In this way, the displacement sensor can accurately read the actual displacement value of the piston, avoiding controller misjudgment caused by signal deviation, thereby ensuring that the shifting actuator can perform the shifting function normally and improving the stability and reliability of the equipment operation.
[0026] 2. When the piston moves, the piston fork shaft cannot rotate relative to the piston due to the limiting effect of the pin in the keyway, thus effectively preventing the magnetic unit from rotating relative to the piston rod.
[0027] 3. The original keyway and pin structure has already achieved the basic anti-rotation function of the main box piston and the main box piston fork shaft, while the addition of fasteners forms a double anti-rotation guarantee.
[0028] 4. While ensuring the sealing of the end face, it can also effectively prevent the bolt from loosening due to torque reduction caused by the rebound of the end face sealant after tightening.
[0029] 5. The internal hexagonal socket head cap screw provides the main tightening force for the connection. Attached Figure Description
[0030] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.
[0031] Figure 1 A schematic diagram of the overall structure of the piston main box with anti-rotation function provided by this utility model;
[0032] Figure 2 A first-view schematic diagram of the keyway in the piston main box with anti-rotation function provided by this utility model;
[0033] Figure 3 A second-view schematic diagram of the keyway in the piston main box with anti-rotation function provided by this utility model;
[0034] Figure 4 A schematic diagram of the installation of the pin in the piston main box with anti-rotation function provided by this utility model;
[0035] Figure 5 This is a schematic diagram of the first operation of the piston main box with anti-rotation function provided by this utility model;
[0036] Figure 6 This is a schematic diagram of the second operation of the piston main box with anti-rotation function provided by this utility model;
[0037] The components include: 1. Main chamber piston; 101. Keyway; 2. Socket hexagonal head screw; 3. Main chamber piston shift fork shaft; 301. Pin; 4. Helical elastic pin; 5. Gear selector; 6. Main chamber piston seal ring; 7. Main chamber support ring; 8. Main chamber piston magnet; 9. Main chamber piston assembly; 10. Gear shifting actuator housing; 11. Gear selector piston shift fork shaft. Detailed Implementation
[0038] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.
[0039] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.
[0040] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.
[0041] In the description of the embodiments of this utility model, it should be noted that if terms such as "upper," "lower," "horizontal," or "inner" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the utility model product is in use, they are only for the convenience of describing the utility model 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 on the utility model. Furthermore, terms such as "first" and "second" are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.
[0042] Furthermore, the use of the term "horizontal" does not imply that the component must be absolutely horizontal, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.
[0043] In the description of the embodiments of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.
[0044] To address the technical deficiencies mentioned in the background section, this embodiment provides a piston master cylinder with anti-rotation function and a shifting actuator. The present invention will be further described in detail below with reference to the accompanying drawings:
[0045] Firstly, this utility model embodiment provides a piston master box with an anti-rotation function, such as... Figures 1-6 As shown, it includes a main piston 1, which is connected to the main piston fork shaft 3 via an anti-rotation structure; a gear selector 5, which is connected to the end of the main piston fork shaft 3 and is perpendicular to the axis of the main piston fork shaft 3; main piston sealing rings 6, which are located at both ends of the outer side of the main piston 1; and a magnetic unit, which is located in the mounting groove on the outer side of the main piston 1 and between the two main piston sealing rings 6, with a main piston support ring 7 sleeved on the outer wall of the magnetic unit.
[0046] In traditional gear shifting actuators, displacement sensors rely on the number and direction of magnetic field lines on the piston to obtain the piston displacement value. When the magnet on the piston rotates relative to the piston rod, it causes a mismatch between the displacement signal and the actual displacement. The controller then misjudges that the piston has not reached the target position, leading to gear engagement failure. In this technical solution, the main piston 1 and the main piston shift fork shaft 3 are connected by an anti-rotation structure, effectively preventing the magnetic unit from rotating relative to the main piston 1. This allows the displacement sensor to accurately read the actual displacement value of the main piston 1, avoiding controller misjudgments due to signal deviation. This ensures the gear shifting actuator can perform the gear engagement function normally, improving the stability and reliability of the equipment operation.
[0047] Because the main gearbox piston 1 can ensure that the displacement sensor obtains accurate displacement information, the controller can more precisely control the movement of the main gearbox piston 1 based on this accurate data. During gear shifting, the main gearbox piston 1 can move smoothly according to the preset trajectory and speed, reducing jerking and impact caused by inaccurate displacement control, thereby significantly improving the smoothness of gear shifting and bringing a better operating experience to the user.
[0048] When the shifting actuator frequently fails to engage gears due to displacement signal errors, it causes internal components such as the main piston 1 and solenoid valve to bear additional stress and impact, accelerating the wear and damage of these components. This technical solution avoids abnormal operating conditions caused by shifting failures by ensuring the normal execution of the shifting function, reducing the workload and wear of internal components, helping to extend the service life of the shifting actuator and the entire equipment, and reducing the maintenance and replacement costs of the equipment.
[0049] The main housing piston sealing ring 6 is located at both ends of the outer side of the main housing large piston 1, effectively preventing gas or liquid leakage inside the cylinder, ensuring stable internal pressure, and further improving the working efficiency and reliability of the shifting actuator. The magnetic unit is located in the mounting groove on the outer side of the main housing large piston 1, between the two main housing piston sealing rings 6, and its outer wall is fitted with a main housing support ring 7. The main housing support ring 7 provides stable support for the magnetic unit, preventing it from shaking or shifting during the movement of the main housing large piston 1, ensuring that the magnetic unit is always in the correct position, thereby ensuring that the displacement sensor can continuously and stably acquire accurate displacement information and maintain the normal working state of the shifting actuator.
[0050] Furthermore, the anti-rotation structure includes a keyway 101, formed on the inner wall of the main piston 1; and a pin 301, located at the end of the main piston shift fork shaft 3 away from the gear selector 5 and perpendicular to the axis of the main piston shift fork shaft 3. The pin 301 is movably connected to the keyway 101, thus forming a reliable anti-rotation connection between the main piston 1 and the main piston shift fork shaft 3. When the main piston 1 moves, due to the limiting effect of the pin 301 within the keyway 101, the main piston shift fork shaft 3 cannot rotate relative to the main piston 1, thereby effectively preventing the magnetic unit from rotating relative to the main piston 1. The displacement sensor can accurately obtain the actual displacement value of the main piston 1, avoiding the mismatch between the displacement value signal and the actual displacement caused by the rotation of the magnetic unit, ensuring the normal operation of the shift actuator and improving the reliability and stability of the equipment.
[0051] During assembly, the main housing piston shift fork shaft 3 with pin 301 is inserted into the main housing large piston 1, allowing pin 301 to enter the keyway 101, thus completing the assembly of the anti-rotation structure. This simple and quick operation significantly improves assembly efficiency and reduces assembly time and labor costs. Furthermore, although the movable connection between pin 301 and keyway 101 achieves the anti-rotation function, this movable connection also allows the main housing piston shift fork shaft 3 to perform a certain amount of axial movement along the length of keyway 101. When the shifting actuator is working, the main housing large piston 1 needs to move along a specific trajectory. This design, which allows axial movement, adapts to the normal working requirements of the main housing large piston 1, ensuring that the main housing large piston 1 can smoothly complete the shifting action without being restricted by the anti-rotation structure. Therefore, while achieving anti-rotation, it also ensures the overall performance of the shifting actuator.
[0052] In this embodiment, the anti-rotation structure also includes a fastener, which is disposed in the main piston 1 and extends to the outside of the main piston 1 and is fixedly connected to the main piston shift fork shaft 3. The original keyway 101 and pin 301 structure has already achieved the basic anti-rotation function of the main piston 1 and the main piston shift fork shaft 3. The addition of the fastener forms a double anti-rotation guarantee. Even if the keyway 101 and pin 301 become slightly loose or weary after long-term use or under large impact, the fastener can still firmly connect the main piston 1 and the main piston shift fork shaft 3 together, preventing relative rotation between the two and ensuring that the magnetic unit will not rotate relative to the main piston 1. This ensures that the displacement sensor can accurately obtain the actual displacement value of the piston, so that the shift actuator can perform the gear shifting function normally. Meanwhile, the fasteners tightly connect the main gearbox piston 1 and the main gearbox piston shift fork shaft 3 together, enhancing the strength of the connection between the two. During gear shifting, the main gearbox piston 1 will be subjected to a large force and impact. The fasteners can effectively disperse these forces, reduce stress concentration at the connection, and prevent deformation or damage at the connection, thereby extending the service life of the main gearbox piston 1 and related components.
[0053] Furthermore, a sealant is applied to the end of the fastener that contacts the inner wall of the main piston 1. The fastener is a hexagonal socket head cap screw 2. This ensures a tight seal on the end face and effectively prevents torque loss and loosening due to the rebound of the sealant after tightening. Additionally, the cylinder of the shifting actuator typically contains gas or liquid media. If there are gaps between the fastener and the inner wall of the main piston 1, these media may leak out, causing unstable pressure within the cylinder, affecting the piston's normal movement and shifting performance, and potentially damaging surrounding components. Applying sealant to the end of the fastener that contacts the inner wall of the main piston 1 tightly fills the gap, effectively isolating the media, preventing leakage, ensuring stable pressure within the cylinder, and thus ensuring the normal operation of the shifting actuator.
[0054] In this embodiment, the magnetic unit is bonded to the mounting groove, and the magnetic unit is the main box large piston magnet 8.
[0055] In this embodiment, the main piston 1 has a hollow structure inside, the main piston fork shaft 3 is disposed in the hollow structure and is axially coincident with the main piston 1, and the gear selector 5 is connected to the main piston fork shaft 3 by a helical elastic pin 4.
[0056] During the operation of the shift actuator, the main gearbox piston assembly 9 is installed in the shift actuator housing 10, and its motion principle and mode are as follows: Figure 5 and Figure 6 As shown; firstly, driven by the air pressure inside the main cylinder, the main cylinder piston assembly 9 reciprocates horizontally, while the gear selector 5 is engaged in the U-shaped groove structure of the gear selector piston fork shaft 11. As the gear selector piston fork shaft 11 reciprocates horizontally, the gear selector 5 inside the groove swings to the corresponding position under the influence of the gear selector piston fork shaft 11. The main cylinder piston fork shaft 3 and the gear selector 5 are rigidly connected by a helical elastic pin 4; therefore, the main cylinder piston fork shaft 3 will swing at the same angle as the gear selector 5.
[0057] During the movement, the hexagonal socket head cap screw 2 ensures that the axial distance between the main piston 1 and the main piston fork shaft 3 is constant. With a constant axial distance, the engagement between the pin 301 on the main piston fork shaft 3 and the keyway 101 on the main piston 1 ensures that the main piston 1 and the main piston fork shaft 3 maintain synchronous swing without relative deflection. This ensures that the main piston magnet 8 does not deflect relative to the main piston during the movement, and that the displacement value of the main piston assembly 9 is always within the reliable range.
[0058] Secondly, a shifting actuator is provided, including a piston masterbox with anti-rotation function as described above.
[0059] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and not to limit its protection scope. Although the utility model has been described in detail with reference to the above embodiments, those skilled in the art should understand that after reading this utility model, they can still make various changes, modifications or equivalent substitutions to the specific implementation of the utility model, but these changes, modifications or equivalent substitutions are all within the protection scope of the pending claims of the utility model.
Claims
1. A piston master box with anti-rotation function, characterized in that, include: The main piston is connected to the main piston fork shaft via an anti-rotation structure. The gear selector is connected to the end of the main housing piston fork shaft and is perpendicular to the axis of the main housing piston fork shaft; The main box piston sealing ring is located at both ends of the outer side of the main box large piston; The magnetic unit is installed in the mounting groove on the outside of the main piston and is located between the two main piston sealing rings. The outer wall of the magnetic unit is fitted with a main piston support ring.
2. The piston main housing with anti-rotation function according to claim 1, characterized in that, The anti-rotation structure includes: The keyway is located on the inner wall of the main piston. A pin is located at the end of the main housing piston fork shaft away from the gear selector head and is perpendicular to the axis of the main housing piston fork shaft. The pin is movably connected to the keyway.
3. The piston main housing with anti-rotation function according to claim 2, characterized in that, The anti-rotation structure also includes: Fasteners are installed in the main piston of the main housing, and their ends extend to the outside of the main piston of the main housing and are fixedly connected to the piston fork shaft of the main housing.
4. The piston main housing with anti-rotation function according to claim 3, characterized in that, A sealant is provided on the end of the fastener that is in contact with the inner wall of the main piston.
5. The piston main housing with anti-rotation function according to claim 3, characterized in that, The fastener is an internal hexagonal flower-shaped cylindrical head screw.
6. The piston main housing with anti-rotation function according to claim 1, characterized in that, The magnetic unit is bonded to the mounting groove.
7. The piston main housing with anti-rotation function according to claim 6, characterized in that, The magnetic unit is the main piston magnet of the main box.
8. The piston main housing with anti-rotation function according to claim 1, characterized in that, The gear selector is connected to the main housing piston fork shaft by a helical elastic pin.
9. The piston main housing with anti-rotation function according to claim 1, characterized in that, The main piston of the main chamber has a hollow structure inside, and the piston fork shaft of the main chamber is set in the hollow structure and coincides with the axial direction of the main piston.
10. A gear shifting actuator, characterized in that, Includes the piston masterbox with anti-rotation function as described in any one of claims 1-9.