Gear shifting air cylinder assembly and gearbox system
By separating multiple working chambers in the shift cylinder assembly and controlling the movement of the main piston using air pressure differences, the problem of shift failure due to environmental factors in the prior art has been solved, and precise shifting of multi-gear transmission systems has been achieved.
Patent Information
- Application Number
- CN202520862998.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-30
- Publication Date
- 2026-02-03
- Estimated Expiration
- 2035-04-30
AI Technical Summary
In the existing technology, when the shift cylinder assembly increases the number of gears in the transmission system, it relies on software calibration to control the piston movement. However, this is greatly affected by environmental factors, which can lead to shift failure.
Multiple working chambers are separated in the shift cylinder assembly. By controlling the air pressure difference between each working chamber and the coordination of valves, the precise movement control of the main piston is achieved, avoiding software calibration and mainly relying on machining to ensure the piston position.
It achieves stable control of the main piston under different environmental conditions, improves shifting accuracy, avoids shifting failure caused by environmental factors, and is suitable for multi-gear transmission systems.
Smart Images
Figure CN223868516U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of vehicle shifting technology, specifically to a shifting cylinder assembly and a transmission system. Background Technology
[0002] The shift cylinder assembly is a key component of the transmission system. During gear shifting, compressed air in the shift cylinder pushes the piston, which in turn drives the shift shaft, which in turn drives the shift fork, ultimately achieving the gear shift.
[0003] With technological advancements, transmission systems are increasingly featuring more gears, necessitating that the shift cylinder assembly provide more operating positions (gear rails). For instance, traditional transmission systems used in light trucks have shift cylinder assemblies with three operating positions (providing three gear rails), and with the shift forks, the system can achieve four forward gears and reverse gear. When transmission systems for light trucks evolve into six-speed systems, three forward gear rails are required, plus a reverse gear rail, meaning the shift cylinder assembly needs to provide a total of four operating positions.
[0004] Current solutions primarily rely on software calibration to find additional shift tracks. For example, a three-position shift cylinder has two chambers, left and right. It achieves three working positions depending on whether each chamber is individually inlet air or both chambers are inlet air simultaneously. When an additional working position is needed, a spring pin is added to the shift shaft, and a tapered pin hole is designed on the gearbox housing to mate with the spring pin. By adjusting the air pressure in the left and right chambers of the shift cylinder, a suitable force is found so that the piston can drive the shift shaft to move until the spring pin enters the tapered pin hole. Real-time feedback control via a displacement sensor ensures the shift shaft is in the designed fourth working position. This places a significant workload on the software calibration because factors such as varying lubrication coefficients of the internal lubricating oil due to different temperatures, friction coefficients caused by assembly gaps between new and old gearboxes, and shift force fluctuations due to vehicle air pressure variations can all affect the force required for the spring pin to enter the tapered pin hole. This often results in the piston failing to move to the appropriate working position, ultimately causing shift failure.
[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 cylinder assembly and a gearbox system that can accurately control the movement of the main piston without the need for software calibration and is unaffected by various environmental factors.
[0007] According to one aspect of the present invention, a shift cylinder assembly is provided, comprising: a shift cylinder and a main piston capable of axial reciprocating motion in the shift cylinder, wherein the main body of the main piston divides the inner cavity of the shift cylinder into a first working chamber and a second working chamber; a third working chamber is disposed in the first working chamber, wherein a first end of the main piston separates the third working chamber from the first working chamber and is capable of axial reciprocating motion in the third working chamber; wherein the first working chamber, the second working chamber and the third working chamber are respectively provided with air passages for connecting valve components.
[0008] In some embodiments, the shift cylinder assembly includes one or more of the following operating states: any one of the first working chamber, the second working chamber, and the third working chamber receives air independently; any two of the first working chamber, the second working chamber, and the third working chamber receive air simultaneously; the first working chamber, the second working chamber, and the third working chamber receive air simultaneously; wherein, in different operating states, the working position of the main piston is different.
[0009] In some embodiments, the air passages of the first working chamber, the second working chamber, and the third working chamber are respectively connected to different valves; or, at least a portion of the air passages of the first working chamber, the second working chamber, and the third working chamber are connected to different valve chambers of the same valve.
[0010] In some embodiments, the shift cylinder assembly further includes: at least one auxiliary piston disposed in the first working chamber and / or the second working chamber, the auxiliary piston being capable of axial reciprocating motion in the corresponding working chamber and being able to limit the stroke of the main piston.
[0011] In some embodiments, the auxiliary piston limits the stroke of the main piston by means of a blocking wall provided on the inner wall of the shift cylinder for limiting the auxiliary piston, and / or the frictional force between the auxiliary piston and the inner wall of the shift cylinder is greater than the frictional force between the main piston and the inner wall of the shift cylinder.
[0012] In some embodiments, the inner wall of the shift cylinder is provided with: a convex guide wall, the main body of the main piston being in a sealing sliding fit with the guide wall; a first blocking wall located on a first side of the guide wall and a first sliding wall connected to the first blocking wall, wherein a first auxiliary piston is in a sealing sliding fit with the first sliding wall and can be limited by the first blocking wall; and / or, a second blocking wall located on a second side of the guide wall and a second sliding wall connected to the second blocking wall, wherein a second auxiliary piston is in a sealing sliding fit with the second sliding wall and can be limited by the second blocking wall.
[0013] In some embodiments, the auxiliary piston is sleeved between the main body and the end of the main piston, and the auxiliary piston and the wall of the main piston to which it is sleeved are sealed and slidably connected, as are the first end of the main piston and the inner wall of the third working chamber.
[0014] In some embodiments, the main piston includes one or more of the following strokes: the main piston moves to a designated position; the main piston moves to a stop at the auxiliary piston; the main piston pushes the auxiliary piston to move.
[0015] In some embodiments, the auxiliary piston includes a first auxiliary piston disposed in the first working chamber and a second auxiliary piston disposed in the second working chamber. The shift cylinder assembly includes one or more of the following operating states: air intake in the third working chamber, the main piston pushes the second auxiliary piston to a first working position; air intake in both the third and second working chambers, the main piston moves to a second working position where it stops at the second auxiliary piston; air intake in both the first and second working chambers, the main piston moves to a third working position where it stops at the first auxiliary piston; air intake in the second working chamber, the main piston pushes the first auxiliary piston to a fourth working position.
[0016] In some embodiments, an end cap is provided at the end of the first working cavity, and a portion of the inner wall of the end cap extends into the first working cavity to form the third working cavity; or, an end cap is provided at the end of the first working cavity, and the end wall of the third working cavity is fixedly connected to the inner wall of the end cap.
[0017] In some embodiments, the air passage of the third working chamber is disposed on the end cap, and the air passages of the first working chamber and the second working chamber are respectively disposed on the cavity walls of the corresponding working chambers.
[0018] According to another aspect of the present invention, a gearbox system is provided, the gearbox system being configured with a shift cylinder assembly as described in any of the above embodiments.
[0019] The beneficial effects of this utility model compared with the prior art include at least the following:
[0020] This invention separates a third working chamber within the first working chamber of a shift cylinder. The main piston can reciprocate axially within the shift cylinder. Its main body separates the first and second working chambers, and its first end separates the third working chamber from the first working chamber. By utilizing the volume difference between the first, second, and third working chambers, and coordinating with valves to control the input pressure of the first, second, and third working chambers, a stable pressure differential can be generated, achieving precise pressure regulation. The movement of the main piston can be accurately controlled without software calibration, relying primarily on machining to ensure the working position of the main piston. This significantly improves control accuracy and is unaffected by various environmental factors.
[0021] The shift cylinder assembly of this utility model can be used to add a fourth working position to a three-position shift cylinder, or can generate more working positions, and is suitable for various types of vehicles such as light trucks.
[0022] 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
[0023] 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.
[0024] Figure 1 and Figure 2 This diagram shows a cross-sectional view of the shift cylinder assembly in an embodiment of the present invention.
[0025] Figure 3 This diagram shows the structure of the main piston in the first working position in an embodiment of the present invention.
[0026] Figure 4 This diagram shows the structure of the main piston in the second working position in an embodiment of the present invention.
[0027] Figure 5 This diagram shows the structure of the main piston in the third working position in an embodiment of the present invention.
[0028] Figure 6 This diagram shows the structure of the main piston in the fourth working position in an embodiment of the present invention. Detailed Implementation
[0029] 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 those described herein. Rather, these embodiments are provided to make the present invention more comprehensive and complete, and to fully convey the concept of the exemplary embodiments to those skilled in the art.
[0030] The accompanying drawings are merely illustrative of the present invention and are not necessarily drawn to scale. The same reference numerals in the drawings denote the same or similar parts, and therefore, repeated descriptions of them will be omitted.
[0031] The terms "first," "second," and similar words used in the specific description do not indicate any order, quantity, or importance, but are merely used to distinguish different components. The terms "left," "right," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. The term "multiple" means two or more, unless otherwise explicitly specified. Furthermore, in the description of the present invention, unless otherwise explicitly specified, the term "connection" should be interpreted broadly, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be a connection within two components.
[0032] 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.
[0033] Figure 1 and Figure 2 The diagram shows the cross-sectional structure of the shift cylinder assembly. Figure 1 and Figure 2 The shift cylinder assembly is sectioned from different axial sections to illustrate the various working chambers and air passages. (Combined) Figure 1 and Figure 2 As shown, the shift cylinder assembly provided in this embodiment of the present invention includes:
[0034] The shift cylinder 10 and the main piston 20 that can reciprocate axially in the shift cylinder 10, the main body of the main piston 20 divides the inner cavity of the shift cylinder 10 into a first working chamber V1 and a second working chamber V2.
[0035] The third working chamber V3 is located in the first working chamber V1. The first end 21 of the main piston 20 separates the third working chamber V3 from the first working chamber V1 and can reciprocate axially in the third working chamber V3.
[0036] The first working chamber V1, the second working chamber V2, and the third working chamber V3 are respectively provided with air passages (P1, P2, P3) for connecting valve components.
[0037] This invention separates a third working chamber V3 within the first working chamber V1 of the shift cylinder 10. The main piston 20 can reciprocate axially within the shift cylinder 10. Its main body separates the first working chamber V1 from the second working chamber V2, and its first end 21 separates the third working chamber V3 from the first working chamber V1. By utilizing the volume difference between the first working chamber V1, the second working chamber V2, and the third working chamber V3, and coordinating with valves to control the input pressure of the first working chamber V1, the second working chamber V2, and the third working chamber V3, a stable pressure difference can be generated, achieving precise pressure regulation. The movement of the main piston 20 can be accurately controlled without software calibration, relying mainly on mechanical processing to ensure the working position of the main piston 20. This significantly improves control accuracy and is unaffected by various environmental factors.
[0038] The main piston 20 can be formed as a one-piece component or as a separate component. In the case of a separate component, the first end 21 of the main piston 20 can be manufactured separately from the other parts of the main piston 20 and fixed together by means of screwing, welding or other methods. In this way, the first end 21 can be flexibly adjusted according to the volume design of the third working chamber V3 so as to separate the third working chamber V3 from the first working chamber V1 through the first end 21.
[0039] The air passages (P1, P2, P3) of the first working chamber V1, the second working chamber V2, and the third working chamber V3 can be connected to different valves (not specifically shown in the figure) to control the input pressure of the first working chamber V1, the second working chamber V2, and the third working chamber V3, allowing any one working chamber to receive air independently, any two working chambers to receive air simultaneously, or all three working chambers to receive air simultaneously. At least a portion of the air passages (P1, P2, P3) of the first working chamber V1, the second working chamber V2, and the third working chamber V3 can be connected to different valve chambers of the same valve, similarly enabling control of the three chambers to receive air independently, any two to receive air simultaneously, or all three to receive air simultaneously. The valves referred to in this invention can be suitable valves such as solenoid valves or control valves. These valves, under the control of the vehicle's controller (e.g., electronic control unit ECU), deliver a suitable amount of compressed gas to the corresponding working chamber to push the main piston 20 to a predetermined working position, thereby enabling the vehicle to shift to the appropriate gear.
[0040] In specific implementation, depending on the air intake conditions of each working chamber, the shift cylinder assembly can include one or more of the following working states: working state where the first working chamber V1 is intake alone; working state where the second working chamber V2 is intake alone; working state where the third working chamber V3 is intake alone; working state where the first working chamber V1 and the second working chamber V2 are intake simultaneously; working state where the first working chamber V1 and the third working chamber V3 are intake simultaneously; working state where the second working chamber V2 and the third working chamber V3 are intake simultaneously; and working state where the first working chamber V1, the second working chamber V2, and the third working chamber V3 are intake simultaneously. Utilizing the volume differences of the first working chamber V1, the second working chamber V2, and the third working chamber V3, different and stable pressure differentials can be generated under different air intake conditions in each working chamber, thereby driving the main piston 20 to move to the set working position. Thus, without the need for software calibration, precise pressure regulation is achieved by relying mainly on the volume differences of the first working chamber V1, the second working chamber V2, and the third working chamber V3, in conjunction with the valves to control the input pressure of the first working chamber V1, the second working chamber V2, and the third working chamber V3, so as to accurately control the movement of the main piston 20.
[0041] The specific volumes of the first working chamber V1, the second working chamber V2, and the third working chamber V3 can be adjusted according to different design requirements (e.g., design requirements for different vehicle models, design requirements for different working conditions, etc.).
[0042] Furthermore, depending on the gear requirements, a fourth working chamber can also be separated in the second working chamber V2. The second end of the main piston 20 is used to separate the second working chamber V2 from the fourth working chamber and reciprocate axially in the fourth working chamber. In this way, by utilizing the volume difference of the four working chambers and coordinating the input pressure control of each working chamber by the valve, the shift cylinder assembly can achieve more working positions.
[0043] The shift cylinder assembly of this utility model can be used to add a fourth working position to a three-position shift cylinder, or can generate more working positions, and is suitable for various types of vehicles such as light trucks.
[0044] Combination Figure 1 and Figure 2 As shown, in some embodiments, an end cap 40 is provided at the end of the first working cavity V1, and a portion of the inner wall of the end cap 40 extends into the first working cavity V1 to form a third working cavity V3. In some cases, the third working cavity V3 may also be formed by a separate component (e.g., an annular component) disposed in the first working cavity V1, and the end wall of the component, i.e., the end wall of the third working cavity V3, is fixedly connected to the inner wall of the end cap 40.
[0045] The air passage P3 of the third working chamber V3 can be disposed on the end cap 40; the air passage P1 of the first working chamber V1 and the air passage P2 of the second working chamber V2 are respectively disposed on the cavity walls of the first working chamber V1 and the second working chamber V2. In other embodiments, the air passages (P1, P2, P3) can be disposed in other ways, as long as they connect the corresponding working chambers to the corresponding valves / valve chambers.
[0046] The end of the second working chamber V2 can be sealed by another end cap 50.
[0047] Continue to combine Figure 1 and Figure 2 As shown, in some embodiments, the shift cylinder assembly further includes at least one auxiliary piston (31, 32) disposed in the first working chamber V1 and / or the second working chamber V2. The auxiliary piston (31, 32) can reciprocate axially in the corresponding working chamber and can limit the stroke of the main piston 20. Based on the volume difference of the three working chambers and the input pressure control of the valves on the three working chambers, this embodiment further limits the stroke of the main piston 20 by using the auxiliary piston (31, 32) to more precisely control the movement of the main piston 20.
[0048] The inner wall of the shift cylinder 10 can be provided with blocking walls (11, 12) for limiting the movement of the auxiliary pistons (31, 32). When the auxiliary pistons (31, 32) move to abut against the corresponding blocking walls under the pressure of the corresponding working chambers, the movement stroke of the main piston 20 can be effectively limited. Figure 1 and Figure 2 Taking the first auxiliary piston 31 and the first blocking wall 11 shown as an example: Under the action of the air pressure in the first working chamber V1, when the first auxiliary piston 31 moves to abut against the first blocking wall 11, it effectively restricts the leftward movement of the main piston 20. In this case, combined with the input pressure control of the valve on the first working chamber V1 and the second working chamber V2, and the restriction of the movement stroke of the main piston 20 by the first auxiliary piston 31, the main piston 20 can be accurately stopped at the working position against the first auxiliary piston 31, thereby realizing precise working position control of the main piston 20.
[0049] The frictional force between the auxiliary pistons (31, 32) and the inner wall of the shift cylinder 10 can be greater than the frictional force between the main piston 20 and the inner wall of the shift cylinder 10. In this way, the movement stroke of the main piston 20 can also be effectively limited by the auxiliary pistons (31, 32).
[0050] Depending on different design requirements, the stroke of the main piston 20 can be limited by friction limiting and / or by a retaining wall limiting method. Preferably, the retaining wall limiting method can ensure accurate working position through machining.
[0051] It should be noted that, depending on the required working position of the shift cylinder assembly, an auxiliary piston may be installed only in the first working chamber V1 or the second working chamber V2, or... Figure 1 and Figure 2 As shown, a first auxiliary piston 31 is provided in the first working chamber V1 and a second auxiliary piston 32 is provided in the second working chamber V2.
[0052] In some specific implementation methods, combined Figure 1 and Figure 2 As shown, the inner wall of the shift cylinder 10 is provided with: a convex guide wall 13, the main body of the main piston 20 being in a sealing sliding fit with the guide wall 13; a first blocking wall 11 located on the first side of the guide wall 13 and a first sliding wall 14 connected to the first blocking wall 11, wherein the first auxiliary piston 31 is in a sealing sliding fit with the first sliding wall 14 and can be limited by the first blocking wall 11; and / or, a second blocking wall 12 located on the second side of the guide wall 13 and a second sliding wall 15 connected to the second blocking wall 12, wherein the second auxiliary piston 32 is in a sealing sliding fit with the second sliding wall 15 and can be limited by the second blocking wall 12.
[0053] The auxiliary pistons (31, 32) can be sleeved between the main body and the end of the main piston 20. The auxiliary pistons (31, 32) are in a sealed sliding connection with the wall of the main piston 20 and the first end 21 of the main piston 20 and the inner wall of the third working chamber V3.
[0054] One method is to groove and embed a sealing ring in the corresponding component to achieve a sealed sliding connection between the two components. Alternatively, oil seals, special coatings, or other methods can be used to achieve a sealed sliding connection between the components.
[0055] With auxiliary pistons (31, 32) provided, the main piston 20 has one or more of the following strokes: under the pressure of the corresponding working chamber, the main piston 20 moves to a designated position, and the auxiliary pistons (31, 32) do not limit the movement or participate in the movement; under the pressure of the corresponding working chamber, combined with the limiting effect of the first auxiliary piston 31 or the second auxiliary piston 32, the main piston 20 moves to stop at the first auxiliary piston 31 or the second auxiliary piston 32; under the pressure of the corresponding working chamber, the main piston 20 pushes the first auxiliary piston 31 or the second auxiliary piston 32 to move.
[0056] Specifically, Figure 3 This diagram illustrates the structure with the main piston in its first working position. Figure 4 This diagram illustrates the structure where the main piston is in its second working position. Figure 5 This diagram illustrates the structure where the main piston is in the third working position. Figure 6 This diagram illustrates the structure where the main piston is in its fourth working position. (Combined with...) Figures 1 to 6 As shown, in some specific implementations, the shift cylinder assembly can have the following four working states.
[0057] Combination Figure 1 , Figure 2 and Figure 3 As shown, in the first working state, air enters the third working chamber V3. Under the pressure of the third working chamber V3, the main piston 20 pushes the second auxiliary piston 32 to move to the first working position. In this case, the valve / valve chamber connected to the third working chamber V3 can be controlled to open, so that the third working chamber V3 is filled with air and pressurized, thereby pushing the main piston 20 to fully extend (i.e., to the first working position).
[0058] Combination Figure 1 , Figure 2 and Figure 4 As shown, in the second working state, air enters the third working chamber V3 and the second working chamber V2. Under the pressure of the third working chamber V3 and the second working chamber V2, the main piston 20 moves to the second working position where it stops at the second auxiliary piston 32. In this case, the valves / valve chambers connected to the third working chamber V3 and the second working chamber V2 can be controlled to open simultaneously. The air pressure in the second working chamber V2 pushes the second auxiliary piston 32 to move until it is limited by the second blocking wall 12, and the air pressure in the third working chamber V3 pushes the main piston 20 to move until it is limited by the second auxiliary piston 32, maintaining balance. At this time, the main piston 20 is partially extended (i.e., located in the second working position).
[0059] Combination Figure 1 , Figure 2 and Figure 5 As shown, in the third working state, air enters the first working chamber V1 and the second working chamber V2. Under the pressure of the first working chamber V1 and the second working chamber V2, the main piston 20 moves to the third working position where it stops at the first auxiliary piston 31. In this case, the valves / valve chambers connected to the first working chamber V1 and the second working chamber V2 can be controlled to open simultaneously. The air pressure in the first working chamber V1 pushes the first auxiliary piston 31 to move until it is limited by the first blocking wall 11, and the air pressure in the second working chamber V2 pushes the main piston 20 to move until it is limited by the first auxiliary piston 31, maintaining balance. At this time, the main piston 20 is partially retracted (i.e., located in the third working position).
[0060] Combination Figure 1 , Figure 2 and Figure 6As shown, in the fourth working state, air enters the second working chamber V2. Under the pressure of the second working chamber V2, the main piston 20 pushes the first auxiliary piston 31 to the fourth working position. In this case, the valve / valve chamber connected to the second working chamber V2 can be controlled to open, so that the second working chamber V2 is filled with air and pressurized, thereby pushing the main piston 20 to retract completely (i.e., to the fourth working position).
[0061] Figures 3 to 6 In the middle, the working chamber and air passage covered by gray dotted shadows are in the air intake state.
[0062] In other embodiments, the shift cylinder assembly may have more operating states than the four mentioned above.
[0063] This utility model embodiment also provides a gearbox system, which is configured with a shift cylinder assembly as described in any of the above embodiments.
[0064] The aforementioned shift cylinder assembly, by dividing the first working chamber V1 of the shift cylinder 10 into a third working chamber V3, utilizes the volume difference between the first working chamber V1, the second working chamber V2, and the third working chamber V3. In conjunction with valves controlling the input pressure of these chambers, a stable pressure differential can be generated, achieving precise pressure regulation. This allows for accurate control of the movement of the main piston 20, eliminating the need for software calibration and relying primarily on machining to ensure the working position of the main piston 20. This significantly improves control accuracy and is unaffected by various environmental factors. Furthermore, the shift cylinder assembly can also be equipped with auxiliary pistons (31, 32) to limit the movement of the main piston 20, enhancing the accuracy of the main piston 20's working position control and enabling accurate gear shifting in the transmission system.
[0065] The transmission system of this utility model can be a six-speed transmission system for light trucks, or it can be used in other models as needed to achieve accurate switching control of multiple gears.
[0066] The above description, in conjunction with specific preferred embodiments, provides a further detailed explanation of the present invention. It should not be construed that the specific implementation of the present invention 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 the present invention, and all such modifications and substitutions should be considered within the protection scope of the present invention.
Claims
1. A shift cylinder assembly, comprising a shift cylinder and a main piston capable of axial reciprocating within the shift cylinder, wherein the main body portion of the main piston divides the inner cavity of the shift cylinder into a first working chamber and a second working chamber. Its features are, The shift cylinder assembly also includes: The third working chamber is disposed in the first working chamber, and the first end of the main piston separates the third working chamber from the first working chamber and can reciprocate axially in the third working chamber; The first working chamber, the second working chamber, and the third working chamber are each provided with an air passage for connecting valve components.
2. The shift cylinder assembly as described in claim 1, characterized in that, The shift cylinder assembly includes one or more of the following operating states: Each of the first working chamber, the second working chamber, and the third working chamber can be air-intaken independently. Air is introduced into any two of the first working chamber, the second working chamber, and the third working chamber simultaneously; The first working chamber, the second working chamber, and the third working chamber are all filled with air simultaneously; The working position of the main piston varies under different working conditions.
3. The shift cylinder assembly as described in claim 1, characterized in that, The air passages of the first working chamber, the second working chamber, and the third working chamber are respectively connected to different valves; Alternatively, at least a portion of the air passages in the first working chamber, the second working chamber, and the third working chamber are connected to different valve chambers of the same valve.
4. The shift cylinder assembly as described in claim 1, characterized in that, Also includes: At least one auxiliary piston is disposed in the first working chamber and / or the second working chamber. The auxiliary piston can reciprocate axially in the corresponding working chamber and can limit the stroke of the main piston.
5. The shift cylinder assembly as described in claim 4, characterized in that, The auxiliary piston limits the stroke of the main piston in the following manner: The inner wall of the shift cylinder is provided with a blocking wall for limiting the auxiliary piston, and / or the frictional force between the auxiliary piston and the inner wall of the shift cylinder is greater than the frictional force between the main piston and the inner wall of the shift cylinder.
6. The shift cylinder assembly as described in claim 5, characterized in that, The inner wall of the shift cylinder is provided with: The main piston has a convex guide wall, and the main body of the piston slides in a sealing manner with the guide wall. A first blocking wall located on a first side of the guide wall and a first sliding wall connected to the first blocking wall, wherein a first auxiliary piston is in a sealing sliding fit with the first sliding wall and can be limited by the first blocking wall; and / or, a second blocking wall located on a second side of the guide wall and a second sliding wall connected to the second blocking wall, wherein a second auxiliary piston is in a sealing sliding fit with the second sliding wall and can be limited by the second blocking wall.
7. The shift cylinder assembly as described in claim 5, characterized in that, The auxiliary piston is sleeved between the main body and the end of the main piston. The auxiliary piston and the wall of the main piston that are sleeved together are in a sealed sliding connection, as are the first end of the main piston and the inner wall of the third working chamber.
8. The shift cylinder assembly as described in any one of claims 4-7, characterized in that, The main piston includes one or more of the following strokes: The main piston moves to the designated position; The main piston moves until it stops at the auxiliary piston; The main piston drives the auxiliary piston to move.
9. The shift cylinder assembly as described in claim 8, characterized in that, The auxiliary piston includes a first auxiliary piston disposed in the first working chamber and a second auxiliary piston disposed in the second working chamber, and the shift cylinder assembly includes one or more of the following working states: Air is introduced into the third working chamber, and the main piston pushes the second auxiliary piston to move to the first working position; Air is introduced into the third working chamber and the second working chamber, and the main piston moves to stop at the second working position of the second auxiliary piston; Air enters the first working chamber and the second working chamber, and the main piston moves to a third working position where it stops at the first auxiliary piston; Air enters the second working chamber, and the main piston pushes the first auxiliary piston to the fourth working position.
10. The shift cylinder assembly as described in claim 1, characterized in that, An end cap is provided at the end of the first working chamber, and a portion of the inner wall of the end cap extends into the first working chamber to form the third working chamber; Alternatively, an end cap may be provided at the end of the first working chamber, and the end wall of the third working chamber may be fixedly connected to the inner wall of the end cap.
11. The shift cylinder assembly as described in claim 10, characterized in that, The air passage of the third working chamber is provided on the end cap, and the air passages of the first working chamber and the second working chamber are respectively provided on the cavity wall of the corresponding working chamber.
12. A transmission system, characterized in that, The transmission system is equipped with a shift cylinder assembly as described in any one of claims 1-11.