Gear shifting air cylinder assembly and gearbox system

Abstract

The invention relates to the technical field of vehicle gear shifting, and provides a gear shifting air cylinder assembly and a gearbox system. The gear shifting air cylinder assembly comprises a gear shifting air cylinder and a main piston capable of conducting axial reciprocating motion in the gear shifting air cylinder, and an inner cavity of the gear shifting air cylinder is divided into a first working cavity and a second working cavity through a main body part of the main piston. The third working cavity is formed in the first working cavity, the third working cavity and the first working cavity are separated by the first end of the main piston, and the main piston can axially reciprocate in the third working cavity; the first working cavity, the second working cavity and the third working cavity are respectively provided with an air channel connected with a valve piece. The volume difference of the first working cavity, the second working cavity and the third working cavity is used for being matched with input pressure control of the valve, stable pressure difference can be generated, accurate pressure adjustment is achieved, movement of the main piston can be accurately controlled, software calibration is not needed, the working position of the main piston is guaranteed mainly through machining, and the working efficiency is improved. The control precision can be obviously improved, and the influence of various environmental factors is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicle shifting, and specifically, to a shifting cylinder assembly and a transmission system. Background Art

[0002] The shifting cylinder assembly is a key component in the transmission system. During the shifting process, the compressed air in the shifting cylinder pushes the piston to move, the piston drives the shifting shaft to move, and the shifting shaft further drives the shifting fork to move, ultimately achieving shifting.

[0003] With the development of technology, the gear design of the transmission system is becoming more and more numerous, which requires the shifting cylinder assembly to provide more working positions (shifting tracks). For example: in a traditional transmission system for light trucks, its shifting cylinder assembly has three working positions (providing three shifting tracks), and in cooperation with the design of the shifting fork, the transmission system can achieve four forward gears and reverse gear; when the transmission system for light trucks develops into a six-speed transmission system, three forward gear tracks are required, plus the reverse gear track, and the shifting cylinder assembly needs to provide a total of four working positions.

[0004] The current solution mainly relies on software calibration to find additional shifting tracks. For example, a three-position shifting cylinder has two left and right cavities. In the three cases of the left and right cavities admitting air independently and the left and right cavities admitting air simultaneously, three working positions are respectively achieved. When an additional working position is needed, a spring pin is added to the shifting shaft, and a tapered pin hole cooperating with the spring pin is designed on the transmission housing. By adjusting the air pressure in the left and right cavities of the shifting cylinder, a suitable force is found so that the piston can just drive the shifting shaft to move until the spring pin slides into the tapered pin hole, and then through real-time feedback control by a displacement sensor, it is ensured that the shifting shaft is at the designed fourth working position. Thus, it brings a very large workload to software calibration. Because affected by factors such as the lubrication coefficient of the internal lubricating oil of the transmission system being different at different temperatures, the fitting clearance of the transmission system in new and old machines affecting the friction coefficient, and the fluctuation of the vehicle air pressure affecting the shifting force, etc., the force for the spring pin to slide into the tapered pin hole will change, resulting in the problem that the piston often cannot move to the appropriate working position in actual application, ultimately causing shifting failure.

[0005] It should be noted that the information disclosed in the above background art section is only used to strengthen the understanding of the background of the present invention, and thus may include information that does not constitute the prior art known to those of ordinary skill in the art. Summary of the Invention

[0006] In view of this, the present invention provides a shifting cylinder assembly and a transmission system, which can accurately control the movement of the main piston, without software calibration, and is not affected by various environmental factors.

[0007] According to one aspect of the present invention, there is provided a shift cylinder assembly, comprising: a shift cylinder and a main piston capable of axially reciprocating in the shift cylinder, a main body portion of the main piston separating an inner cavity of the shift cylinder into a first working chamber and a second working chamber; a third working chamber disposed in the first working chamber, a first end of the main piston separating the third working chamber from the first working chamber and capable of axially reciprocating in the third working chamber; wherein, air passages for connecting valve members are respectively provided in the first working chamber, the second working chamber and the third working chamber.

[0008] In some embodiments, the shift cylinder assembly includes one or more of the following working states: any one of the first working chamber, the second working chamber and the third working chamber intakes air alone; any two of the first working chamber, the second working chamber and the third working chamber intake air simultaneously; the first working chamber, the second working chamber and the third working chamber intake air simultaneously; wherein, in different working states, the working positions of the main piston are 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 valve members; or, at least some of the air passages of the first working chamber, the second working chamber and the third working chamber are connected to different valve cavities of the same valve member.

[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 capable of axially reciprocating in the corresponding working chamber and capable of restricting the movement stroke of the main piston.

[0011] In some embodiments, the auxiliary piston restricts the movement stroke of the main piston in the following manner: a blocking wall for limiting the auxiliary piston is provided on an inner wall of the shift cylinder, 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 guiding wall, the main body portion of the main piston being in sealing sliding fit with the guiding wall; a first blocking wall on a first side of the guiding wall and a first sliding wall connecting the first blocking wall, wherein a first auxiliary piston is in sealing sliding fit with the first sliding wall and can be limited by the first blocking wall; and / or, a second blocking wall on a second side of the guiding wall and a second sliding wall connecting the second blocking wall, wherein a second auxiliary piston is in 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 body portion and the end portion of the main piston, and is in sealed sliding connection between the wall of the auxiliary piston and the wall of the main piston for sleeving, and between 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 movement strokes: the main piston moves to a specified position; the main piston moves to 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 working states: the third working chamber intakes air, and the main piston pushes the second auxiliary piston to move to a first working position; the third working chamber and the second working chamber intake air, and the main piston moves to stop at a second working position of the second auxiliary piston; the first working chamber and the second working chamber intake air, and the main piston moves to stop at a third working position of the first auxiliary piston; the second working chamber intakes air, and the main piston pushes the first auxiliary piston to move to a fourth working position.

[0016] In some embodiments, an end cover is disposed at the end of the first working chamber, and a part of the inner wall of the end cover extends into the first working chamber to form the third working chamber; alternatively, an end cover is disposed at the end of the first working chamber, and the end wall of the third working chamber is fixedly connected to the inner wall of the end cover.

[0017] In some embodiments, the air passage of the third working chamber is disposed on the end cover, and the air passages of the first working chamber and the second working chamber are respectively disposed on the chamber walls of the corresponding working chambers.

[0018] According to another aspect of the present invention, a transmission system is provided, and the transmission system is configured with the shift cylinder assembly as described in any of the above embodiments.

[0019] The beneficial effects of the present invention compared with the prior art at least include:

[0020] In the present invention, a third working chamber is separated in the first working chamber of the shift cylinder. The main piston can reciprocate axially in the shift cylinder. Its main body part separates the first working chamber from the second working chamber, and its first end separates the third working chamber from the first working chamber. By utilizing the volume differences of the first working chamber, the second working chamber, and the third working chamber, and coordinating with the valve components to control the input pressures of the first working chamber, the second working chamber, and the third working chamber, a stable pressure difference can be generated, precise pressure regulation can be achieved, the movement of the main piston can be accurately controlled, software calibration is not required, and the working position of the main piston is mainly ensured by mechanical machining, which can significantly improve the control accuracy and is not affected by various environmental factors.

[0021] The shift cylinder assembly of the present invention can be used to add a fourth working position to a three-position shift cylinder, or can also generate more working positions, and is applicable to various types of vehicle models such as light trucks.

[0022] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The drawings herein are incorporated into the specification and form a part of the specification, showing embodiments consistent with the present invention, and are used together with the specification to explain the principles of the present invention. Obviously, the drawings described below are only some embodiments of the present invention, and those of ordinary skill in the art can obtain other drawings based on these drawings without creative efforts.

[0024] Figure 1 and Figure 2 show a schematic cross-sectional structure diagram of the shift cylinder assembly in an embodiment of the present invention;

[0025] Figure 3 show a schematic structure diagram of the main piston in the first working position in an embodiment of the present invention;

[0026] Figure 4 show a schematic structure diagram of the main piston in the second working position in an embodiment of the present invention;

[0027] Figure 5 show a schematic structure diagram of the main piston in the third working position in an embodiment of the present invention;

[0028] Figure 6 show a schematic structure diagram of the main piston in the fourth working position in an embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0029] Example embodiments will now be described more fully with reference to the accompanying drawings. However, the example embodiments can be implemented in various forms and should not be construed as limited to the embodiments described herein. On the contrary, these embodiments are provided so that this invention will be more complete and comprehensive, and the concept of the example embodiments will be fully conveyed to those skilled in the art.

[0030] The accompanying drawings are merely schematic illustrations 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 thus repeated descriptions thereof will be omitted.

[0031] The terms "first", "second", and similar terms used in the detailed description do not denote any order, quantity, or importance, but are merely used to distinguish different components. The orientation or positional relationship indicated by terms such as "left", "right", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation of the present invention. The meaning of the term "a plurality" is two or more, unless otherwise specifically defined. In addition, in the description of the present invention, unless otherwise clearly defined, the term "connection" should be understood in a broad sense. 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 directly connected, or indirectly connected through an intermediate medium, or it can be the communication inside two elements.

[0032] It should be noted that, without conflict, the features in the embodiments of the present invention and different embodiments can be combined with each other.

[0033] Figure 1 and Figure 2 schematically shows the sectional structure of the shift cylinder assembly, Figure 1 and Figure 2 respectively cut the shift cylinder assembly from different axial cutting planes to schematically show each working chamber and air passage. Combining Figure 1 and Figure 2 as shown, the shift cylinder assembly provided by the embodiment of the present invention includes:

[0034] a shift cylinder 10 and a main piston 20 that can reciprocate axially in the shift cylinder 10. The main body portion 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] a third working chamber V3, which is arranged in the first working chamber V1. The first end 21 of the main piston 20 divides the third working chamber V3 from the first working chamber V1 and can reciprocate axially in the third working chamber V3;

[0036] Among them, 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] In the present invention, a third working chamber V3 is separated in the first working chamber V1 of the shift cylinder 10. The main piston 20 can reciprocate axially in the shift cylinder 10. Its main body part separates the first working chamber V1 and the second working chamber V2, and its first end 21 separates the third working chamber V3 and the first working chamber V1. By utilizing the volume differences among the first working chamber V1, the second working chamber V2, and the third working chamber V3, and coordinating the control of the input pressures of the first working chamber V1, the second working chamber V2, and the third working chamber V3 by valve components, a stable pressure difference can be generated, accurate pressure regulation can be achieved, the movement of the main piston 20 can be accurately controlled, software calibration is not required, and the working position of the main piston 20 is mainly ensured by mechanical machining, which can significantly improve the control accuracy and is not affected by various environmental factors.

[0038] The main piston 20 can be formed as an integral component or as a split component. In the case of a split component, the first end 21 of the main piston 20 and other parts of the main piston 20 can be manufactured separately and fixed together by means such as screwing or welding. Thus, 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 and 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 respectively connected to different valve components (the valve components are not specifically shown in the figure) so as to realize the control of the input pressures of the first working chamber V1, the second working chamber V2, and the third working chamber V3, enabling any one of the working chambers to intake air alone, or any two of the working chambers to intake air simultaneously, or all three working chambers to intake air simultaneously. At least some 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 cavities of the same valve component, and the same can also realize controlling the separate intake of air by the three, the simultaneous intake of air by any two, or the simultaneous intake of air by all three. The valve components referred to in the present invention can be suitable valve components such as solenoid valves and control valves. The valve components are used to convey an appropriate amount of compressed gas to the corresponding working chamber under the control of a vehicle controller (such as an electronic control unit ECU) to push the main piston 20 to move to a predetermined working position, so that the vehicle can shift to an appropriate gear.

[0040] In specific implementation, according to the air intake conditions of each working chamber, the shift cylinder assembly may include one or more of the following working states: the working state where the first working chamber V1 intakes air alone, the working state where the second working chamber V2 intakes air alone, the working state where the third working chamber V3 intakes air alone, the working state where the first working chamber V1 and the second working chamber V2 intake air simultaneously, the working state where the first working chamber V1 and the third working chamber V3 intake air simultaneously, the working state where the second working chamber V2 and the third working chamber V3 intake air simultaneously, and the working state where the first working chamber V1, the second working chamber V2, and the third working chamber V3 intake air simultaneously. By 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 differences can be generated under different air intake conditions of each working chamber, thereby pushing the main piston 20 to move to the set working position. In this way, without software calibration, mainly relying on the volume differences of the first working chamber V1, the second working chamber V2, and the third working chamber V3, and cooperating with the valve components to control the input pressures of the first working chamber V1, the second working chamber V2, and the third working chamber V3, precise pressure regulation can be achieved to accurately control the movement of the main piston 20.

[0041] Among them, 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 (for example, the design requirements of different vehicle models, the design requirements of different working conditions, etc.).

[0042] Furthermore, according to the gear position 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 differences of the four working chambers and cooperating with the valve components to control the input pressures of each working chamber, the shift cylinder assembly can achieve more working positions.

[0043] The shift cylinder assembly of the present invention can be used to add a fourth working position to a three-position shift cylinder and can also generate more working positions, and is applicable to various types of vehicle models such as light trucks.

[0044] Combined with Figure 1 and Figure 2 As shown, in some embodiments, an end cover 40 is provided at the end of the first working chamber V1, and a part of the inner wall of the end cover 40 extends into the first working chamber V1 to form the third working chamber V3. In some cases, the third working chamber V3 can also be formed by an independent component (such as an annular component) provided in the first working chamber V1, and the end wall of this component, that is, the end wall of the third working chamber V3, is fixedly connected to the inner wall of the end cover 40.

[0045] The air passage P3 of the third working chamber V3 can be arranged on the end cover 40; the air passages P1 of the first working chamber V1 and P2 of the second working chamber V2 are respectively arranged on the chamber walls of the first working chamber V1 and the second working chamber V2. In other embodiments, the air passages (P1, P2, P3) can be arranged in other ways, as long as the corresponding working chamber can be connected to the corresponding valve member / valve chamber.

[0046] The end of the second working chamber V2 can be sealed by another end cover 50.

[0047] Continue to combine Figure 1 and Figure 2 As shown in the figure, in some embodiments, the shift cylinder assembly further includes: at least one auxiliary piston (31, 32), arranged in the first working chamber V1 and / or the second working chamber V2, and the auxiliary piston (31, 32) can move axially back and forth in the corresponding working chamber and can limit the movement stroke of the main piston 20. On the basis of the volume differences of the three working chambers and the input pressure control of the three working chambers by the valve member, in this embodiment, the movement stroke of the main piston 20 is further limited by 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 auxiliary piston (31, 32). When the auxiliary piston (31, 32) moves to abut against the corresponding blocking wall under the pressure of the corresponding working chamber, an effective limit to the movement stroke of the main piston 20 can be formed. Taking Figure 1 and Figure 2 the first auxiliary piston 31 and the first blocking wall 11 shown in the figure as an example: under the air pressure of the first working chamber V1, when the first auxiliary piston 31 moves to abut against the first blocking wall 11, an effective limit to the leftward movement stroke of the main piston 20 is formed; in this case, combined with the input pressure control of the first working chamber V1 and the second working chamber V2 by the valve member and the limitation of the movement stroke of the main piston 20 by the first auxiliary piston 31, the main piston 20 can accurately stop at the working position abutting against the first auxiliary piston 31, thereby realizing the precise control of the working position of the main piston 20.

[0049] The friction force between the auxiliary piston (31, 32) and the inner wall of the shift cylinder 10 can be greater than the friction force between the main piston 20 and the inner wall of the shift cylinder 10. In this way, the effective limitation of the movement stroke of the main piston 20 by the auxiliary piston (31, 32) can also be realized.

[0050] According to different design requirements, the movement stroke of the main piston 20 can be limited by the friction force limitation method and / or the blocking wall limitation method. More preferably, the blocking wall limitation method can ensure an accurate working position through mechanical processing.

[0051] It should be noted that according to the working positions to be achieved by the shift cylinder assembly, the auxiliary piston can be provided 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 manners, in combination with Figure 1 and Figure 2 as shown, the inner wall of the shift cylinder 10 is provided with: an inwardly convex guiding wall 13, and the main body of the main piston 20 is in sealing sliding fit with the guiding wall 13; a first blocking wall 11 on the first side of the guiding wall 13 and a first sliding wall 14 connecting the first blocking wall 11, wherein the first auxiliary piston 31 is in 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 on the second side of the guiding wall 13 and a second sliding wall 15 connecting the second blocking wall 12, wherein the second auxiliary piston 32 is in 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 specifically be sleeved between the main body and the end of the main piston 20, and there are sealing sliding connections between the auxiliary pistons (31, 32) and the wall of the main piston 20 for sleeving, and between the first end 21 of the main piston 20 and the inner wall of the third working chamber V3.

[0054] Among them, grooves can be opened on the corresponding components and sealing rings can be embedded to achieve the sealing sliding connection between the two components through the sealing rings. The sealing sliding connection between the components can also be achieved by means such as oil seals and special coatings.

[0055] In the case where the auxiliary pistons (31, 32) are provided, the main piston 20 has one or more of the following movement strokes: under the pressure of the corresponding working chamber, the main piston 20 moves to a specified position, and the auxiliary pistons (31, 32) do not play a limiting role and do not participate in the movement; under the pressure of the corresponding working chamber and in combination with the limiting action 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 shows the structure of the main piston in the first working position, Figure 4 shows the structure of the main piston in the second working position, Figure 5 shows the structure of the main piston in the third working position, Figure 6 shows the structure of the main piston in the fourth working position. In combination withFigures 1 to 6 As shown, in some specific implementation manners, the shift cylinder assembly can have the following four working states.

[0057] Combined with Figure 1 、 Figure 2 and Figure 3 As shown, in the first working state, the third working chamber V3 intakes air. 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 member / valve chamber connected to the third working chamber V3 can be controlled to open, so that the third working chamber V3 is inflated and pressurized, and then the main piston 20 is fully extended (i.e., located at the first working position).

[0058] Combined with Figure 1 、 Figure 2 and Figure 4 As shown, in the second working state, the third working chamber V3 and the second working chamber V2 intake air. Under the pressure of the third working chamber V3 and the second working chamber V2, the main piston 20 moves to stop at the second working position of the second auxiliary piston 32. In this case, the valve member / valve chamber 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 to maintain balance. At this time, the main piston 20 extends partially (i.e., located at the second working position).

[0059] Combined with Figure 1 、 Figure 2 and Figure 5 As shown, in the third working state, the first working chamber V1 and the second working chamber V2 intake air. Under the pressure of the first working chamber V1 and the second working chamber V2, the main piston 20 moves to stop at the third working position of the first auxiliary piston 31. In this case, the valve member / valve chamber 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 to maintain balance. At this time, the main piston 20 retracts partially (i.e., located at the third working position).

[0060] Combined with Figure 1 、 Figure 2 and Figure 6As shown, in the fourth working state, the second working chamber V2 intakes air. Under the pressure of the second working chamber V2, the main piston 20 pushes the first auxiliary piston 31 to move to the fourth working position. In this case, the valve component / valve chamber connected to the second working chamber V2 can be controlled to open, so that the second working chamber V2 is inflated and maintained at a certain pressure, thereby pushing the main piston 20 to retract completely (i.e., located at the fourth working position).

[0061] Figures 3 to 6 In the figure, the working chambers and air passages covered by the gray dotted shadows are in the air intake state.

[0062] In other embodiments, the shift cylinder assembly may have more working states, not limited to the above four.

[0063] The embodiment of the present invention further provides a transmission system, and the transmission system is configured with a shift cylinder assembly as described in any of the above embodiments.

[0064] The above shift cylinder assembly divides the third working chamber V3 in the first working chamber V1 of the shift cylinder 10. By using the volume differences of the first working chamber V1, the second working chamber V2, and the third working chamber V3, and cooperating with the valve component to control the input pressures of the first working chamber V1, the second working chamber V2, and the third working chamber V3, a stable pressure difference can be generated, and accurate pressure regulation can be achieved. The movement of the main piston 20 can be accurately controlled without software calibration, and the working position of the main piston 20 is mainly ensured by mechanical processing, which can significantly improve the control accuracy and is not affected by various environmental factors. Further, the shift cylinder assembly may also be provided with auxiliary pistons (31, 32) to utilize the limiting effect of the auxiliary pistons (31, 32) on the main piston 20 to enhance the accuracy of controlling the working position of the main piston 20, so that the transmission system can achieve accurate gear shifting.

[0065] The transmission system of the present invention can be a six-speed transmission system for light trucks, or can also be used in other vehicle models as needed to achieve accurate switching control of multiple gears.

[0066] The above content is a further detailed description of the present invention in combination with specific preferred embodiments. It cannot be determined that the specific implementation of the present invention is only limited to these descriptions. For those of ordinary skill in the technical field to which the present invention belongs, without departing from the concept of the present invention, several simple deductions or substitutions can still be made, which should all be regarded as belonging to the protection scope of the present invention.

Claims

1. A shift cylinder assembly, comprising a shift cylinder and a main piston capable of axially reciprocating in the shift cylinder, the main body of the main piston dividing the inner cavity of the shift cylinder into a first working chamber and a second working chamber; It is characterized in that The shift cylinder assembly further includes: A third working chamber, arranged in the first working chamber, the first end of the main piston separating the third working chamber from the first working chamber and capable of axially reciprocating in the third working chamber; Wherein, the first working chamber, the second working chamber and the third working chamber are respectively provided with air ducts for connecting valve components.

2. The shift cylinder assembly according to claim 1, wherein, The shift cylinder assembly includes one or more of the following working states: Any one of the first working chamber, the second working chamber and the third working chamber intakes air alone; Any two of the first working chamber, the second working chamber and the third working chamber intake air simultaneously; The first working chamber, the second working chamber and the third working chamber intake air simultaneously; Wherein, in different working states, the working positions of the main piston are different.

3. The shift cylinder assembly according to claim 1, wherein, The air ducts of the first working chamber, the second working chamber and the third working chamber are respectively connected to different valve components; Or, at least some of the air ducts of the first working chamber, the second working chamber and the third working chamber are connected to different valve cavities of the same valve component.

4. The shift cylinder assembly according to claim 1, characterized in that, It further includes: At least one auxiliary piston, arranged in the first working chamber and / or the second working chamber, the auxiliary piston capable of axially reciprocating in the corresponding working chamber and capable of restricting the movement stroke of the main piston.

5. The shift cylinder assembly according to claim 4, wherein The auxiliary piston restricts the movement 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 according to claim 5, characterized in that, The inner wall of the shift cylinder is provided with: An inwardly convex guiding wall, the main body of the main piston being in sealed sliding fit with the guiding wall; A first blocking wall on the first side of the guiding wall and a first sliding wall connecting the first blocking wall, wherein a first auxiliary piston is in sealed sliding fit with the first sliding wall and can be limited by the first blocking wall; and / or, a second blocking wall on the second side of the guiding wall and a second sliding wall connecting the second blocking wall, wherein a second auxiliary piston is in sealed sliding fit with the second sliding wall and can be limited by the second blocking wall.

7. The shift cylinder assembly according to claim 5, wherein, The auxiliary piston is sleeved between the main body and the end of the main piston, and there is sealed sliding connection between the auxiliary piston and the wall of the main piston for sleeving, and between the first end of the main piston and the inner wall of the third working chamber.

8. The shift cylinder assembly according to any one of claims 4-7, characterized in that, The main piston includes one or more of the following movement strokes: The main piston moves to a specified position; The main piston moves and stops at the auxiliary piston; The main piston pushes the auxiliary piston to move.

9. The shift cylinder assembly according to claim 8, wherein, The auxiliary piston includes a first auxiliary piston arranged in the first working chamber and a second auxiliary piston arranged in the second working chamber, and the shift cylinder assembly includes one or more of the following working states: The third working chamber intakes air, and the main piston pushes the second auxiliary piston to move to the first working position; The third working chamber and the second working chamber intake air, and the main piston moves to stop at the second working position of the second auxiliary piston; The first working chamber and the second working chamber intake air, and the main piston moves to stop at the third working position of the first auxiliary piston; The second working chamber intakes air, and the main piston pushes the first auxiliary piston to move to the fourth working position.

10. The shift cylinder assembly according to claim 1, characterized in that, An end cover is provided at the end of the first working chamber, and a part of the inner wall of the end cover extends into the first working chamber to form the third working chamber; Alternatively, an end cover is provided at the end of the first working chamber, and the end wall of the third working chamber is fixedly connected to the inner wall of the end cover.

11. The shift cylinder assembly according to claim 10, wherein, The air passage of the third working chamber is provided on the end cover, and the air passages of the first working chamber and the second working chamber are respectively provided on the chamber walls of the corresponding working chambers.

12. A transmission system, characterized in that, The transmission system is configured with the shift cylinder assembly as described in any one of claims 1-11.

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