Gear shifting structure capable of simultaneously switching double shifting forks

Abstract

The utility model discloses a gear shifting structure capable of simultaneously switching double shifting forks, which can simultaneously control the two shifting forks, fully save and utilize the internal space of a transfer case, utilize a rotatable rolling pin structure to be matched with a roller path structure, greatly reduce abrasion, guarantee the service life of the whole structure, enable the gear shifting process to be smoother and improve the gear shifting efficiency. And the blocking risk is reduced. The main structure of the gear shifting device comprises a first shifting fork, a second shifting fork, a gear shifting guide shaft, a gear shifting rotating shaft and a gear shifting wheel body, a first driving piece is arranged on the first shifting fork, a second driving piece is arranged on the second shifting fork, a first circumferential roller path and a second circumferential roller path are arranged on the gear shifting wheel body, and the first circumferential roller path comprises a long flat ring groove section, a tail inclined ring groove section and a tail flat ring groove section. And the second circumferential raceway comprises a first-position flat ring groove section, a second-position inclined ring groove section, a second-position flat ring groove section, a third-position inclined ring groove section, a third-position flat ring groove section, a fourth-position inclined ring groove section and a fourth-position flat ring groove section.

Description

Technical Field

[0001] The utility model belongs to the technical field of vehicle transmission and transfer case, and in particular relates to a shifting structure capable of performing double shift fork switching simultaneously. Background Art

[0002] The transfer case is a common internal structure of a car. In a conventional transfer case, if it does not have a built-in differential lock structure, it usually has gears such as 2H gear (two-wheel drive high gear), 4H gear (four-wheel drive high gear), and 4L gear (four-wheel drive low gear). If it has a built-in differential lock structure, it usually has gears such as 2H gear (two-wheel drive high gear), 4HLc gear (four-wheel drive high speed differential lock gear), 4H gear (four-wheel drive high speed gear), and 4L gear (four-wheel drive low speed gear).

[0003] To achieve switching between so many gears, considering factors such as structural rationality and work efficiency, two shift forks (referred to as shift forks) are required to work together. For example, under normal circumstances, one shift fork is responsible for switching the working position between the power input structure, the two-wheel drive transmission structure, and the differential lock structure, and the other shift fork is responsible for switching the working position between the high-speed transmission structure and the low-speed transmission structure. Utility Model Content

[0004] The utility model provides a shifting structure that can switch between two shift forks at the same time. It uses the automatic guiding function of the first circumferential raceway and the second circumferential raceway to control the two shift forks at the same time, so it can be applied to the scene where multiple transfer case gear adjustments need to be realized. In addition, by setting the second circumferential raceway in the form of rear-section reverse guidance, the internal space of the transfer case can be fully saved and utilized. It also uses a rotatable rolling pin structure to cooperate with the raceway structure, which can greatly reduce wear and tear, ensure the service life of the overall structure, and make the shifting process smoother, reducing the risk of jamming.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] The first gear is connected with the gear selector by the spring which is fixed to the shift post by the spring which is fixed to the shift post and the second gear is connected with the gear selector by the spring which is fixed to the shift post by the spring.

[0007] The first circumferential raceway includes a long flat ring groove section, a tail oblique ring groove section and a tail flat ring groove section which are connected in sequence, and the long flat ring groove section, the tail oblique ring groove section and the tail flat ring groove section are arranged in sequence along the front-to-back direction of the shift guide shaft;

[0008] The second circumferential raceway includes a first-position flat ring groove segment, a second-position oblique ring groove segment, a second-position flat ring groove segment, a third-position oblique ring groove segment, a third-position flat ring groove segment, a fourth-position oblique ring groove segment and a fourth-position flat ring groove segment that are connected in sequence. The first-position flat ring groove segment, the second-position oblique ring groove segment, the second-position flat ring groove segment, the third-position oblique ring groove segment and the third-position flat ring groove segment are arranged in sequence along the front-to-back direction of the shift guide shaft. The fourth-position flat ring groove segment, the four-position oblique ring groove segment and the third-position flat ring groove segment are arranged in sequence along the front-to-back direction of the shift guide shaft.

[0009] Preferably, the first driving member further includes a first pin shaft fixed to the first shift fork, a first rolling pin is rotatably connected to the first pin shaft, and a rotation centerline of the first rolling pin is perpendicular to and intersects with the axis of the shift shaft, and the second driving member further includes a second pin shaft fixed to the second shift fork, the second rolling pin is rotatably connected to the second pin shaft, and a rotation centerline of the second rolling pin is perpendicular to and intersects with the axis of the shift shaft.

[0010] Preferably, in the length direction of the shift shaft: the end of the first rolling pin adjacent to the shift front end is the first pin front end, the end of the first rolling pin away from the shift front end is the first pin rear end, the end of the second rolling pin adjacent to the shift front end is the second pin front end, and the end of the second pin away from the shift front end is the second pin rear end;

[0011] If the front end of the first pin contacts the side wall of the first circumferential raceway, there is a gap between the rear end of the first pin and the side wall of the first circumferential raceway; if the rear end of the first pin contacts the side wall of the first circumferential raceway, there is a gap between the front end of the first pin and the side wall of the first circumferential raceway;

[0012] If the front end of the second pin contacts the side wall of the second circumferential raceway, there is a gap between the rear end of the second pin and the side wall of the second circumferential raceway; if the rear end of the second pin contacts the side wall of the second circumferential raceway, there is a gap between the front end of the second pin and the side wall of the second circumferential raceway.

[0013] As a preference,

[0014] When the second rolling pin is matched with the first flat ring groove section or the second oblique ring groove section or the second flat ring groove section or the third oblique ring groove section or the third flat ring groove section, the first rolling pin is matched with the long flat ring groove section;

[0015] When the second rolling pin is engaged with the tail oblique ring groove section, the first rolling pin is engaged with the fourth oblique ring groove section;

[0016] When the second rolling pin cooperates with the tail flat ring groove section, the first rolling pin cooperates with the fourth flat ring groove section.

[0017] Preferably, the vertical projection outer contour of the first rolling pin is composed of a first front arc side line, a first rear arc side line and two symmetrically arranged first straight sides, and the first front arc side line, any first straight side line and the first rear arc side line are arranged in sequence along the front-to-back direction of the shift guide shaft, and the vertical projection outer contour of the second rolling pin is composed of a second front arc side line, a second rear arc side line and two symmetrically arranged second straight sides, and the second front arc side line, any second straight side line and the second rear arc side line are arranged in sequence along the front-to-back direction of the shift guide shaft.

[0018] The beneficial effects of the present invention are: utilizing the automatic guiding function of the first circumferential raceway and the second circumferential raceway to control the two shift forks at the same time, so that it can be applied to scenarios where multiple transfer case gear adjustments need to be achieved; in addition, by setting the second circumferential raceway in the form of rear-stage reverse guidance, the internal space of the transfer case can be fully saved and utilized; the rotatable rolling pin structure is coordinated with the raceway structure, which can greatly reduce wear and tear, ensure the service life of the overall structure, and make the shifting process smoother and reduce the risk of jamming; setting the rolling pin in the form of "one end resting" has lower requirements on the processing accuracy of the circumferential raceway, and has better anti-impact and anti-jamming effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural diagram of the utility model;

[0020] Figure 2 yes Figure 1 Schematic diagram of the back structure;

[0021] Figure 3 This is a schematic diagram of the structure when the second rolling pin cooperates with the second flat ring groove segment;

[0022] Figure 4 This is a schematic diagram of the structure when the second rolling pin cooperates with the three-position flat ring groove segment;

[0023] Figure 5 This is a schematic diagram of the structure when the second rolling pin cooperates with the four-position flat ring groove segment;

[0024] Figure 6 1. Schematic diagram of the paths at the first circumferential raceway and the second circumferential raceway;

[0025] Figure 7 is a schematic diagram of the vertical projection of the first rolling pin;

[0026] Figure 8 It is a schematic diagram of the vertical projection of the second rolling pin.

[0027] Figure numerals: shift guide shaft 1, shift fork 1 101, shift fork 2 102, shift shaft 2, shift wheel body 3, long flat ring groove section 3.11, tail oblique ring groove section 3.12, tail flat ring groove section 3.13, first flat ring groove section 3.21, second oblique ring groove section 3.22, second flat ring groove section 3.23, third oblique ring groove section 3.24, third flat ring groove section 3.25, fourth oblique ring groove section 3.26, fourth flat ring groove section 3.27, first rolling pin 401, first front curved edge line 401a, first rear curved edge line 401b, first straight edge line 401c, first pin shaft 402, second rolling pin 501, second front curved edge line 501a, second rear curved edge line 501b, second straight edge line 502c, second pin shaft 502. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative efforts shall fall within the scope of protection of the present invention.

[0029] like Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 、 Figure 6 As shown, a shift structure capable of simultaneously performing dual-fork shifting includes a shift fork 101, a second shift fork 102, a shift guide shaft 1, a shift shaft 2, and a shift wheel body 3 provided on the shift shaft 2. The shift fork 101 is slidably connected to the shift guide shaft 1, the second shift fork 102 is slidably connected to the shift guide shaft 1, the shift guide shaft 1 is parallel to the shift shaft 2, the shift fork 101 is provided with a first driving member, the first driving member includes a first rolling pin 401 that can rotate relative to the shift fork 101, the shift fork 102 is slidably connected to the shift guide shaft 1, the shift guide shaft 1 is parallel to the shift shaft 2, and the first driving member includes a first rolling pin 401 that can rotate relative to the shift fork 101. A second driving member is provided on the shift wheel body 3, and the second driving member includes a second rolling pin 501 that can rotate relative to the second shift fork 102. A first circumferential raceway that cooperates with the first rolling pin 401 and a second circumferential raceway that cooperates with the second rolling pin 501 are provided on the shift wheel body 3. One end of the shift guide shaft 1 is the shift front end, and the other end of the shift guide shaft 1 is the shift rear end. The front-to-back direction of the shift guide shaft 1 is parallel to the axial direction of the shift guide shaft 1; the shift front end, the first driving member, the second driving member and the shift rear end are arranged in sequence along the front-to-back direction of the shift guide shaft 1;

[0030] The first circumferential raceway comprises a long flat ring groove section 3.11, a tail oblique ring groove section 3.12 and a tail flat ring groove section 3.13 which are connected in sequence. The long flat ring groove section 3.11, the tail oblique ring groove section 3.12 and the tail flat ring groove section 3.13 are arranged in sequence along the front-to-back direction of the shift guide shaft 1;

[0031] The second circumferential raceway includes a first-position flat ring groove segment 3.21, a second-position oblique ring groove segment 3.22, a second-position flat ring groove segment 3.23, a third-position oblique ring groove segment 3.24, a third-position flat ring groove segment 3.25, a fourth-position oblique ring groove segment 3.26, and a fourth-position flat ring groove segment 3.27, which are connected in sequence. The first-position flat ring groove segment 3.21, the second-position oblique ring groove segment 3.22, the second-position flat ring groove segment 3.23, the third-position oblique ring groove segment 3.24, and the third-position flat ring groove segment 3.25 are arranged in sequence along the front-to-back direction of the shift guide shaft 1. The fourth-position flat ring groove segment 3.27, the fourth-position oblique ring groove segment 3.26, and the third-position flat ring groove segment 3.25 are arranged in sequence along the front-to-back direction of the shift guide shaft 1.

[0032] In the prior art, the shift guide shaft 1 is arranged horizontally, and the shift rotating shaft 2 is arranged horizontally.

[0033] The present invention can be used for the "transfer case with built-in differential lock structure" recorded in the background technology, which has 2H gear (two-wheel drive high gear), 4HLc gear (four-wheel drive high-speed differential lock gear), 4H gear (four-wheel drive high gear), and 4L gear (four-wheel drive low-speed gear). Accordingly, the present invention also needs to provide shift fork positions corresponding to the four gears. As for how the shift fork itself cooperates with the internal structure of the transmission such as the power input structure, two-wheel drive transmission structure, differential lock structure, high-speed transmission structure or low-speed transmission structure, it belongs to the existing technology and can be selected according to actual needs. No absolute limitation is made here.

[0034] For example:

[0035] like Figure 1 As shown, when the present invention is in 2H gear (two-wheel drive high speed gear), the first rolling pin 401 cooperates with the long flat ring groove section 3.11, and the second rolling pin 501 cooperates with the first flat ring groove section 3.21;

[0036] like Figure 3 As shown, when the utility model is in 4HLc gear (four-wheel drive high-speed differential lock gear), the first rolling pin 401 cooperates with the long flat ring groove section 3.11, and the second rolling pin 501 cooperates with the second flat ring groove section 3.23;

[0037] like Figure 4 As shown, when the utility model is in 4H gear (four-wheel drive high speed gear), the first rolling pin 401 cooperates with the long flat ring groove section 3.11, and the second rolling pin 501 cooperates with the three-position flat ring groove section 3.25.

[0038] like Figure 5 As shown, when the utility model is in 4L gear (four-wheel drive low speed gear), the first rolling pin 401 cooperates with the tail flat ring groove section 3.13, and the second rolling pin 501 cooperates with the fourth flat ring groove section 3.27.

[0039] When it is necessary to switch gears, the shift shaft 2 drives the shift wheel body 3 to rotate, and through the action of the first circumferential raceway, the shift fork 101 can be driven to move forward and backward along the shift guide shaft 1 or the shift fork 101 can be kept stationary (when the shift wheel body 3 rotates, if the first roller of the shift fork 101 cooperates with a flat ring groove section, the shift fork 101 will not move; if the first roller of the shift fork 101 cooperates with a beveled ring groove section, the shift fork 101 moves). Through the action of the second circumferential raceway, the shift fork 2 102 can be driven to move forward and backward along the shift guide shaft 1 or the shift fork 2 102 can be kept stationary (when the shift wheel body 3 rotates, if the second roller of the shift fork 2 102 cooperates with a flat ring groove section, the shift fork 2 102 will not move; if the second roller of the shift fork 2 102 cooperates with a beveled ring groove section, the shift fork 2 102 moves), thereby allowing the shift forks 101 and 102 to change positions when needed.

[0040] As previously stated, "the first-position flat ring groove segment 3.21, the second-position oblique ring groove segment 3.22, the second-position flat ring groove segment 3.23, the third-position oblique ring groove segment 3.24 and the third-position flat ring groove segment 3.25 are arranged in sequence along the front-to-back direction of the shift guide shaft 1, and the fourth-position flat ring groove segment 3.27, the fourth-position oblique ring groove segment 3.26 and the third-position flat ring groove segment 3.25 are arranged in sequence along the front-to-back direction of the shift guide shaft 1." This shows that the guidance of the fourth-position oblique ring groove segment 3.26 is "reverse guidance", that is, it allows the second shift fork 102 to go back (move in the direction opposite to the front-to-back direction of the shift guide shaft 1). In this way, the second shift fork 102 does not have to move all the way forward. The second shift fork 102 is used to drive the transmission structure inside the transmission. Therefore, the internal space of the transfer case can be fully saved and utilized.

[0041] The first rolling pin 401 cooperates with the first circumferential raceway. When the shift guide shaft 1 drives the shift wheel body 3 to rotate, if the shift fork 101 and the first rolling pin 401 move axially along the shift guide shaft 1, the first rolling pin 401 also rotates. Compared to a non-rotatable coupling structure, the wear between the rotating first rolling pin 401 and the first circumferential raceway is much less, which can better ensure the service life of the entire structure. In addition, the forward and backward rolling of the first rolling pin 401 also allows the first rolling pin 401 to move more smoothly between the flat annular groove segments and the beveled annular groove segments, greatly reducing the risk of blocking and preventing damage to the first rolling pin 401 due to shifting shock. The cooperation and effectiveness of the second rolling pin 501 and the second circumferential raceway are similar to those described above.

[0042] like Figure 1As shown, the first driving member also includes a first pin shaft 402 fixed to the shift fork 101, the first rolling pin 401 is rotatably connected to the first pin shaft 402, and the rotation center line of the first rolling pin 401 is perpendicular to and intersects with the axis of the shift shaft 2, and the second driving member also includes a second pin shaft 502 fixed to the shift fork 2 102, the second rolling pin 501 is rotatably connected to the second pin shaft 502, and the rotation center line of the second rolling pin 501 is perpendicular to and intersects with the axis of the shift shaft 2.

[0043] The axis of the first pin shaft 402 is parallel to the axis of the second pin shaft 502 .

[0044] The first pin shaft 402 is fixed to the first fork 101, and the first rolling pin 401 is rotatably connected to the first pin shaft 402, which can simply and effectively achieve a reasonable arrangement of the first rolling pin 401. The second pin shaft 502 is fixed to the second fork 102, and the second rolling pin 501 is rotatably connected to the second pin shaft 502, which can simply and effectively achieve a reasonable arrangement of the second rolling pin 501.

[0045] In the length direction of the shift shaft 2: the end of the first rolling pin 401 adjacent to the shift front end is the first pin front end, the end of the first rolling pin 401 away from the shift front end is the first pin rear end, the end of the second rolling pin 501 adjacent to the shift front end is the second pin front end, and the end of the second pin away from the shift front end is the second pin rear end;

[0046] If the front end of the first pin contacts the side wall of the first circumferential raceway, there is a gap between the rear end of the first pin and the side wall of the first circumferential raceway; if the rear end of the first pin contacts the side wall of the first circumferential raceway, there is a gap between the front end of the first pin and the side wall of the first circumferential raceway;

[0047] If the front end of the second pin contacts the side wall of the second circumferential raceway, there is a gap between the rear end of the second pin and the side wall of the second circumferential raceway; if the rear end of the second pin contacts the side wall of the second circumferential raceway, there is a gap between the front end of the second pin and the side wall of the second circumferential raceway.

[0048] The first rolling pin 401 does not "abut against" the first circumferential raceway at both ends, but "abuts against" it at one end. The second rolling pin 501 does not "abut against" the second circumferential raceway at both ends, but "abuts against" it at one end.

[0049] Taking the first rolling pin 401 as an example, the advantage of this structural form is that when the first rolling pin 401 moves in the front-to-back direction along the shift guide shaft 1, only the front end of the first pin contacts the side wall of the first circumferential raceway, while the rear end of the first pin is separated from the side wall of the first circumferential raceway (or, when the first rolling pin 401 moves in the direction opposite to the front-to-back direction along the shift guide shaft 1, only the rear end of the first pin contacts the side wall of the first circumferential raceway, while the front end of the first pin is separated from the side wall of the first circumferential raceway). This reduces unnecessary friction and leaves a margin, allowing the first rolling pin 401 to enter the first circumferential raceway from a flat ring groove section to an inclined ring groove section (or vice versa), more smoothly, effectively reducing the risk of blocking. The same applies to the second rolling pin 501.

[0050] Furthermore, if the first rolling pin 401 is arranged to "abut against" the first circumferential raceway at both ends, then the transition section between the flat ring groove section and the oblique ring groove section in the first circumferential raceway needs to be precisely dimensioned, otherwise it will easily become stuck. Obviously, the "one-end abutment" arrangement in this solution requires lower machining accuracy for the first circumferential raceway and provides better anti-impact and anti-jamming effects (when the shift wheel body 3 rotates abnormally or too quickly, the first rolling pin 401 will also move very quickly in the front-to-rear direction along the shift guide shaft 1. In this way, if the first rolling pin 401 enters the oblique ring groove section from a flat ring groove section, the pressure between the first rolling pin 401 and the oblique ring groove section will instantly become very high, i.e., it will be subjected to "abnormal impact", which may also cause the first rolling pin 401 to neither rotate normally nor continue to move normally along the oblique ring groove section, i.e., it will become stuck). The same applies to the second rolling pin 501.

[0051] like Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 、 Figure 6 As shown, when the second rolling pin 501 cooperates with the first-position flat ring groove segment 3.21 or the second-position oblique ring groove segment 3.22 or the second-position flat ring groove segment 3.23 or the third-position oblique ring groove segment 3.24 or the third-position flat ring groove segment 3.25, the first rolling pin 401 cooperates with the long flat ring groove segment 3.11;

[0052] When the second rolling pin 501 is engaged with the tail oblique ring groove section 3.12, the first rolling pin 401 is engaged with the fourth oblique ring groove section 3.26;

[0053] When the second rolling pin 501 cooperates with the tail flat ring groove section 3.13, the first rolling pin 401 cooperates with the fourth flat ring groove section 3.27.

[0054] When the second rolling pin 501 moves in the first-position flat ring groove section 3.21 or the second-position oblique ring groove section 3.22 or the second-position flat ring groove section 3.23 or the third-position oblique ring groove section 3.24 or the third-position flat ring groove section 3.25, the first rolling pin 401 will never move axially along the shift guide shaft 1. When the second rolling pin 501 moves axially along the shift guide shaft 1 to the tail oblique ring groove section 3.12, the first rolling pin 401 moves axially along the shift guide shaft 1 to the fourth-position oblique ring groove section 3.26. When the second rolling pin 501 moves axially along the shift guide shaft 1 to the tail flat ring groove section 3.13, the first rolling pin 401 moves axially along the shift guide shaft 1 to the fourth-position flat ring groove section 3.27.

[0055] like Figure 7 、 Figure 8 As shown, the vertical projection outer contour of the first rolling pin 401 is composed of a first front arc edge 401a, a first rear arc edge 401b and two symmetrically arranged first straight edges 401c, and the first front arc edge 401a, any first straight edge 401c and the first rear arc edge 401b are arranged in sequence along the front-to-back direction of the shift guide shaft 1, and the vertical projection outer contour of the second rolling pin 501 is composed of a second front arc edge 501a, a second rear arc edge 501b and two symmetrically arranged second straight edges 502c, and the second front arc edge 501a, any second straight edge 502c and the second rear arc edge 501b are arranged in sequence along the front-to-back direction of the shift guide shaft 1.

[0056] The first straight line 401 c is parallel to the axis of the shift guide shaft 1 , and the second straight line 502 c is parallel to the axis of the shift guide shaft 1 .

[0057] Taking the first rolling pin 401 as an example, the contact portion between the first rolling pin 401 and the sidewall of the first circumferential raceway is "the end of the first rolling pin 401 adjacent to the shifting front end or the end of the first rolling pin 401 away from the shifting front end." In this solution, the first rolling pin 401 is configured to be bulging in the middle and converging at both ends. Specifically, "the vertically projected outer contour of the first rolling pin 401 is composed of a first front curved edge 401a, a first rear curved edge 401b, and two symmetrically arranged first straight edges 401c. The first front curved edge 401a, any one of the first straight edges 401c, and the first rear curved edge 401b are arranged in sequence along the front-to-back direction of the shift guide shaft 1." This transitions the contact between the first rolling pin 401 and the sidewall of the first circumferential raceway from surface to point contact, reducing mutual friction and making the first rolling pin 401 easier to move, thus ensuring smoother shifting. The same applies to the second rolling pin 501.

[0058] The above is a detailed introduction to the embodiments of the present invention. Specific examples are used in this article to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method and core idea of ​​the present invention. At the same time, for those skilled in the art, based on the idea of ​​the present invention, there will be changes in the specific implementation methods and application scope. In summary, the contents of this specification should not be understood as limiting the present invention.

Claims

1. A shifting structure capable of performing simultaneous double-fork shifting, characterized in that: The first gear is connected with the first gear shaft by the guide rail, and the second gear is connected with the guide rail by the guide rail, and the shift wheel body is connected with the shift wheel body by the guide rail. The first circumferential raceway includes a long flat ring groove section, a tail oblique ring groove section and a tail flat ring groove section which are connected in sequence, and the long flat ring groove section, the tail oblique ring groove section and the tail flat ring groove section are arranged in sequence along the front-to-back direction of the shift guide shaft; The second circumferential raceway includes a first-position flat ring groove segment, a second-position oblique ring groove segment, a second-position flat ring groove segment, a third-position oblique ring groove segment, a third-position flat ring groove segment, a fourth-position oblique ring groove segment and a fourth-position flat ring groove segment that are connected in sequence. The first-position flat ring groove segment, the second-position oblique ring groove segment, the second-position flat ring groove segment, the third-position oblique ring groove segment and the third-position flat ring groove segment are arranged in sequence along the front-to-back direction of the shift guide shaft. The fourth-position flat ring groove segment, the four-position oblique ring groove segment and the third-position flat ring groove segment are arranged in sequence along the front-to-back direction of the shift guide shaft.

2. A shifting structure capable of performing simultaneous double-fork shifting according to claim 1, characterized in that: The first driving member also includes a first pin shaft fixed to the first shift fork, a first rolling pin is rotatably connected to the first pin shaft, and a rotation centerline of the first rolling pin is perpendicular to and intersects with the axis of the shift shaft. The second driving member also includes a second pin shaft fixed to the second shift fork, the second rolling pin is rotatably connected to the second pin shaft, and a rotation centerline of the second rolling pin is perpendicular to and intersects with the axis of the shift shaft.

3. A shifting structure capable of performing simultaneous double-fork shifting according to claim 2, characterized in that: In the length direction of the shift shaft: the end of the first rolling pin adjacent to the shift front end is the first pin front end, the end of the first rolling pin away from the shift front end is the first pin rear end, the end of the second rolling pin adjacent to the shift front end is the second pin front end, and the end of the second pin away from the shift front end is the second pin rear end; If the front end of the first pin contacts the side wall of the first circumferential raceway, there is a gap between the rear end of the first pin and the side wall of the first circumferential raceway; if the rear end of the first pin contacts the side wall of the first circumferential raceway, there is a gap between the front end of the first pin and the side wall of the first circumferential raceway; If the front end of the second pin contacts the side wall of the second circumferential raceway, there is a gap between the rear end of the second pin and the side wall of the second circumferential raceway; if the rear end of the second pin contacts the side wall of the second circumferential raceway, there is a gap between the front end of the second pin and the side wall of the second circumferential raceway.

4. A shifting structure capable of performing simultaneous double-fork shifting according to claim 1, 2 or 3, characterized in that: When the second rolling pin is matched with the first flat ring groove section or the second oblique ring groove section or the second flat ring groove section or the third oblique ring groove section or the third flat ring groove section, the first rolling pin is matched with the long flat ring groove section; When the second rolling pin is engaged with the tail oblique ring groove section, the first rolling pin is engaged with the fourth oblique ring groove section; When the second rolling pin cooperates with the tail flat ring groove section, the first rolling pin cooperates with the fourth flat ring groove section.

5. A shifting structure capable of performing simultaneous double-fork shifting according to claim 1, 2 or 3, characterized in that: The vertical projection outer contour of the first rolling pin is composed of a first front arc side line, a first rear arc side line and two symmetrically arranged first straight sides, and the first front arc side line, any first straight side line and the first rear arc side line are arranged in sequence along the front-to-back direction of the shift guide shaft. The vertical projection outer contour of the second rolling pin is composed of a second front arc side line, a second rear arc side line and two symmetrically arranged second straight sides, and the second front arc side line, any second straight side line and the second rear arc side line are arranged in sequence along the front-to-back direction of the shift guide shaft.

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