Gear shifting gearbox

Abstract

The utility model provides a gear shifting gearbox, and relates to the field of gearboxes, and the gear shifting gearbox comprises a box body, a gear shifting handle, a gear shifting fork shaft, two gear shifting driving levers and two gear shifting sliding blocks. The gear shifting handle is connected with the gear shifting fork shaft, and the gear shifting fork shaft is rotatably connected with the box body; each shifting rod comprises a connecting rod and a shifting fork cover, the connecting rods are detachably connected with the shifting fork covers, the connecting rods of the two shifting rods are fixedly connected with the shifting fork shaft, and the two shifting rods are arranged in the axial direction of the shifting fork shaft at intervals; the two gear shifting sliding blocks are connected with the two connecting rods correspondingly. The two gear shifting sliding blocks are used for being connected with a transmission gear sleeve. According to the structural design of the gearbox, the dismounting difficulty of the gear shifting sliding block can be reduced, the dismounting efficiency is improved, and the dismounting cost is reduced.

Description

Technical Field

[0001] The utility model relates to the field of gearboxes, and more particularly to a shift gearbox. Background Art

[0002] For gearboxes such as flying shear gearboxes, according to the requirements of the output working conditions, a flywheel shifting device is commonly used to disengage and engage the flywheel to balance the output torque of the output shaft and the stable output speed. Among them, the structure in which the flywheel is placed inside the gearbox housing has received increasing attention because it can improve the overall stability of the gearbox. The existing built-in shifting device, that is, the flywheel and the components of the shifting device are mainly located inside the gearbox, uses a fork structure for shifting to achieve the disengagement and engagement of the flywheel.

[0003] The inventor has found through research that the existing shifting device has at least the following disadvantages:

[0004] The shift lever is connected to the transmission gear sleeve through a slider. The slider will move relative to the transmission gear sleeve, resulting in wear. After use, the slider needs to be replaced regularly. Since the slider is installed at the end of the shift lever, due to the limited installation space, it cannot be directly disassembled and the shift fork shaft needs to be removed first, resulting in cumbersome replacement operations, inconvenient operation, and low efficiency. In addition, a sleeve is connected between the two shift levers. The two shift levers are installed outside the shift fork shaft by relying on the sleeve. Due to the distance between the two shift levers, the lengths of the shift fork shaft and the sleeve are long, and the shift fork shaft is prone to flexural deformation. The longer the shift fork shaft, the greater the deformation, resulting in inconvenient assembly of the sleeve. Summary of the Utility Model

[0005] The purpose of the utility model is to provide a shift gearbox, which can reduce the difficulty of disassembly and assembly of the shift slider, improve the disassembly and assembly efficiency, and reduce the disassembly and assembly cost.

[0006] The embodiments of the utility model are implemented as follows:

[0007] In a first aspect, the utility model provides a shift gearbox, comprising:

[0008] A housing, a shift handle, a shift fork shaft, two shift levers, and two shift sliders. The shift handle is connected to the shift fork shaft, and the shift fork shaft is rotatably connected to the housing; each shift lever includes a connecting rod and a fork cover. The connecting rod is detachably connected to the fork cover. The connecting rods of the two shift levers are both fixedly connected to the shift fork shaft. The two shift levers are arranged at intervals in the axial direction of the shift fork shaft; the two shift sliders are respectively connected to the two connecting rods; the two shift sliders are both used for connecting with the transmission gear sleeve.

[0009] In an alternative embodiment, an assembly hole is provided on the connecting rod, a keyway is provided on the hole wall of the assembly hole, the assembly hole is sleeved outside the shift fork shaft, and a flat key connected to the shift fork shaft is embedded in the keyway.

[0010] In an alternative embodiment, a first concave-convex portion is provided at one end of the connecting rod, a second concave-convex portion is provided at one end of the shift fork cover, and the first concave-convex portion is in plug-in fit with the second concave-convex portion.

[0011] In an alternative embodiment, a threaded hole is provided on the connecting rod, a fixing lug is provided on the shift fork cover, a fixing member is installed on the fixing lug, and the fixing member is in screw-threaded fit with the threaded hole to fix the shift fork cover to the connecting rod.

[0012] In an alternative embodiment, the shift gearbox further includes a retaining ring. The retaining ring is sleeved outside the shift fork shaft. The connecting rod is limited by two adjacent retaining rings or the connecting rod is limited by one retaining ring and a shoulder provided outside the shift fork shaft, so that the connecting rod is fixed relative to the shift fork shaft in the axial direction of the shift fork shaft.

[0013] In an alternative embodiment, the shift gearbox further includes a positioning pin, a set screw, a fixing nut and a spacer ring. The positioning pin penetrates through the shift slider and the shift fork cover at the same time. The fixing nut and the spacer ring are both sleeved outside the positioning pin. The fixing nut, the shift fork cover, the spacer ring and the shift slider are arranged in sequence; the set screw is tightened with the shift fork cover and abuts against the positioning pin.

[0014] In an alternative embodiment, the number of the fixing nuts is two and they are located on the same side of the shift fork cover.

[0015] In an alternative embodiment, the shift gearbox further includes a through cover. The through cover is installed outside the box body. The shift fork shaft penetrates through the box body and the through cover at the same time. An oil seal and a sealing ring are provided between the through cover and the box body, and the oil seal is located outside the sealing ring.

[0016] In an alternative embodiment, a first groove and a second groove are provided on the inner wall surface of the through cover. The oil seal is arranged in the first groove, and the sealing ring is arranged in the second groove.

[0017] In an alternative embodiment, the shift handle is connected to the shift fork shaft through a flat key structure.

[0018] In an alternative embodiment, the shift gearbox further includes an induction component. The induction component is installed on the box body and is used to obtain the position of the shift handle.

[0019] The beneficial effects of the embodiments of the present utility model are as follows:

[0020] In summary, for the shift gearbox provided in this embodiment, the shift lever is set as a split structure, connected to the shift fork shaft through a connecting rod, and connected to the shift slider through a fork cover. In this way, when it is necessary to maintain the shift slider, the fork cover is separated from the connecting rod, and it is not necessary to disassemble the shift fork shaft from the box body, which reduces the operation difficulty and improves the operation efficiency. At the same time, by independently setting two shift levers, each shift lever has a small width and a small dimension in the axial direction of the shift fork shaft, is less affected by the flexural deformation of the shift fork shaft, is convenient to install, and has high installation quality of the shift lever. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the following will briefly introduce the drawings required in the embodiments. It should be understood that the following drawings only show some embodiments of the present utility model, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, without creative efforts, other relevant drawings can also be obtained based on these drawings.

[0022] Figure 1 Schematic diagram of a perspective view of the shift gearbox according to the embodiment of the present utility model;

[0023] Figure 2 Schematic diagram of another perspective view of the shift gearbox according to the embodiment of the present utility model;

[0024] Figure 3 For Figure 2 Enlarged schematic diagram of part A in

[0025] Figure 4 For Figure 2 Enlarged schematic diagram of part B in

[0026] Figure 5 Partial structural schematic diagram of the shift gearbox according to the embodiment of the present utility model;

[0027] Figure 6 Schematic diagram of the structure of the shift lever according to the embodiment of the present utility model.

[0028] ICON:

[0029] 100 - Housing; 110 - Shift lever; 130 - Shift fork shaft; 131 - First end; 132 - Second end; 140 - Shift rod; 141 - Connecting rod; 142 - Fork cover; 143 - First concave-convex part; 144 - Second concave-convex part; 145 - Threaded hole; 146 - Fixed lug; 147 - Fastening piece; 150 - Shift slider; 160 - Induction component; 170 - First shaft section; 180 - Second shaft section; 190 - Transmission gear sleeve; 200 - Connecting gear sleeve; 210 - Flywheel; 220 - Shaft end baffle; 230 - Oil seal; 240 - Sealing ring; 250 - Transparent cover; 260 - First shaft sleeve; 270 - Second shaft sleeve; 280 - First retaining ring; 290 - Second retaining ring; 300 - Positioning pin; 310 - Set screw; 320 - Fixing nut; 330 - Spacer ring; 340 - Fixed seat; 350 - First flat key; 360 - Second flat key; 370 - Deep groove ball bearing. Detailed implementation mode

[0030] To make the objectives, technical solutions and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are some but not all of the embodiments of the present utility model. Usually, the components of the embodiments of the present utility model described and illustrated in the accompanying drawings here can be arranged and designed in various different configurations.

[0031] Therefore, the following detailed description of the embodiments of the present utility model provided in the accompanying drawings is not intended to limit the scope of the claimed present utility model, but merely represents the selected embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts fall within the scope of protection of the present utility model.

[0032] It should be noted that: Similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0033] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the present utility model is customarily placed during use. It is only for the convenience of describing the present utility model 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 therefore cannot be construed as a limitation to the present utility model. In addition, terms such as "first", "second", "third", etc. are only used for distinguishing descriptions and cannot be understood as indicating or implying relative importance.

[0034] In addition, terms such as "horizontal" and "vertical" do not mean that the components are required to be absolutely horizontal or hanging vertically, but can be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0035] In the description of the present utility model, it should also be noted that unless otherwise clearly specified and defined, the terms "set", "installed", "connected", "coupled" 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, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0036] Currently, the shift gearbox is generally divided into an external shift gearbox and an internal shift gearbox according to the installation position of the flywheel 210. Among them, the flywheel 210 and the shift device of the internal shift gearbox are both located inside the gearbox, with a compact structure and a small volume, and the usage frequency is getting higher and higher. In the prior art, whether it is an external shift gearbox or an internal shift gearbox, the shift lever is set as an integral structure. A slider is installed at the end of the shift lever, and the slider is connected to the shift gear ring (which can also be called the transmission gear sleeve 190). The other end of the shift lever is installed on the sleeve, and the two shift levers are connected to the shift fork shaft through the sleeve. When replacing the slider, it is necessary to disassemble the shift fork shaft, which is inconvenient to operate. In addition, the shift fork shaft is a long shaft part and has a certain flexural deformation, which will greatly affect the coaxiality of the two shift levers and reduce the assembly quality.

[0037] In view of this, the designer provides a shift gearbox, which can reduce the operation difficulty of replacing the shift slider 150, improve the assembly efficiency, and can also reduce the installation difficulty of the two shift levers 140 and improve the assembly quality.

[0038] Please combine Figures 1 - 6, in this embodiment, the shift gearbox includes a housing 100, a shift lever 110, a shift fork shaft 130, two shift rods 140, and two shift sliders 150. The shift lever is connected to the shift fork shaft, and the shift fork shaft is rotatably connected to the housing 100; each shift rod 140 includes a connecting rod 141 and a fork cover 142, the connecting rod 141 is detachably connected to the fork cover 142, the connecting rods 141 of the two shift rods 140 are fixedly connected to the shift fork shaft 130, and the two shift rods 140 are arranged at intervals in the axial direction of the shift fork shaft 130; the two shift sliders 150 are respectively connected to the two connecting rods 141; the two shift sliders 150 are both used to connect with the transmission gear sleeve 190.

[0039] Continuing from the above, the working process of the shift gearbox provided in this embodiment is as follows:

[0040] The two shift sliders 150 are respectively installed in the chutes on the outer peripheral surface of the transmission gear sleeve 190. Rotate the shift lever 110, and the shift lever 110 transmits torque to the two shift rods 140 through the shift fork shaft 130. The two shift rods 140 rotate synchronously to drive the two shift sliders 150 to move. The two shift sliders 150 cooperate to drive the transmission gear sleeve 190 to slide in its axial direction. The transmission gear sleeve 190 can be engaged with or separated from the connecting gear sleeve 200 installed with the flywheel 210. When the transmission gear sleeve 190 is engaged with the connecting gear sleeve 200, torque can be transmitted to the flywheel 210 through the transmission gear sleeve 190. When the transmission gear sleeve 190 is separated from the connecting gear sleeve 200, the torque will not be transmitted to the flywheel 210, and the transmission gear sleeve 190 idles and disengages from the flywheel 210. It should be understood that the connecting gear sleeve 200 can be rotatably matched with the rotating shaft through a deep groove ball bearing 370, which has low cost and is convenient to install.

[0041] It should be noted that for the shift gearbox provided in this embodiment, the shift rod 140 is set as a split structure, connected to the shift fork shaft 130 through the connecting rod 141 and connected to the shift slider 150 through the fork cover 142. In this way, when the shift slider 150 needs to be maintained, the fork cover 142 is separated from the connecting rod 141, and it is not necessary to disassemble the shift fork shaft 130 from the housing 100, which reduces the operation difficulty and improves the operation efficiency. At the same time, by independently setting the two shift rods 140, each shift rod 140 has a small width and a small size in the axial direction of the shift fork shaft, is less affected by the flexural deformation of the shift fork shaft, is convenient to install, and has high installation quality of the shift rod 140.

[0042] The following embodiments will illustrate the details of the shift gearbox of the present application by way of examples.

[0043] It should be noted that this embodiment is described by taking the flywheel 210 and the shift device as being built-in as an example.

[0044] Please combine with Figures 1 - 6 In this embodiment, optionally, the shift gearbox includes a housing 100, a shift lever 110, a shift fork shaft 130, two shift rods 140, two shift sliders 150, a sensing assembly 160, a first shaft section 170, a second shaft section 180, a transmission gear sleeve 190, a connecting gear sleeve 200, a flywheel 210, a shaft end baffle 220, a oil seal 230, a sealing ring 240, a through cover 250, a first shaft sleeve 260, a second shaft sleeve 270, a first snap ring 280, two second snap rings 290, a positioning pin 300, a set screw 310, a fixing nut 320 and a spacer ring 330.

[0045] Please combine with Figure 1 Among them, the first shaft section 170 and the second shaft section 180 are arranged as an integral structure and rotatably installed in the housing 100, and the axes of the first shaft section 170 and the second shaft section 180 coincide. The transmission gear sleeve 190 is sleeved outside the first shaft section 170, and the two are in spline fit. When the first shaft section 170 rotates, it can drive the transmission gear sleeve 190 to rotate together, and the transmission gear sleeve 190 can slide axially relative to the first shaft section 170. The transmission gear sleeve 190 is provided with external teeth. The connecting gear sleeve 200 is rotatably connected to the second shaft section 180 through a deep groove ball bearing 370. The connecting gear sleeve 200 is provided with internal teeth. When the transmission gear sleeve 190 slides, the internal teeth thereon can engage or disengage with the external teeth on the connecting gear sleeve 200. The flywheel 210 is installed outside the connecting gear sleeve 200.

[0046] Since the connecting gear sleeve 200 is connected to the second shaft section 180 by using a deep groove ball bearing 370, it can effectively bear the radial load, there is no problem of performance waste, and the cost is low.

[0047] Please combine with Figure 2 、 Figure 3 and Figure 5, Optionally, the shift fork shaft 130 has a first end 131 and a second end 132 in its axial direction. On the shift fork shaft 130, there are a first shoulder, a second shoulder, a third shoulder, and a fourth shoulder arranged in sequence from the first end 131 to the second end 132. The first shaft sleeve 260, the second shaft sleeve 270, the through cover 250, the first retaining ring 280, and two second retaining rings 290 are all sleeved outside the shift fork shaft 130. The first shaft sleeve 260 is installed on the housing 100. One side of the first shaft sleeve 260 abuts against the second shoulder, and the other side is positioned by the through cover 250 fixedly connected to the housing 100. Between the through cover 250 and the shift fork shaft 130, there are an oil seal 230 and a sealing ring 240, which is a double-sealing structure with good sealing effect. To improve the installation quality, on the inner wall surface of the through cover 250, there are a first groove and a second groove. The oil seal 230 is located in the first groove, the sealing ring 240 is located in the second groove, and the oil seal 230 is located on the side away from the first shaft sleeve 260 of the sealing ring 240. The through cover 250 can be fixedly connected to the housing 100 through bolts or the like. At the same time, the second shaft sleeve 270 is installed on the fixed seat 340 inside the housing 100, and the second shaft sleeve 270 abuts against the fourth shoulder.

[0048] Further, the two connecting rods 141 of the two shift fork shafts 130 are respectively connected to the shift fork shafts 130 through first flat keys 350. One side of the first flat key 350 close to the shift handle 110 abuts against the third shoulder, and the other side abuts against the first retaining ring 280. The two sides of the first flat key 350 away from the shift handle 110 respectively abut against the two second retaining rings 290. It should be understood that both the first retaining ring 280 and the second retaining rings 290 can be elastic snap rings. Correspondingly, on the outer peripheral surface of the shift fork shaft 130, there are three annular grooves, and the first retaining ring 280 and the two second retaining rings 290 are respectively snap-fitted with the three annular grooves one by one, which is convenient for installation.

[0049] It should be noted that one end of the shift fork shaft 130 extends out of the housing 100 and is connected to the shift handle 110. The shift handle 110 is sleeved outside the shift fork shaft 130, and the shift handle 110 is fixedly connected to the shift fork shaft 130 through a second flat key 360. Moreover, one side of the shift handle 110 abuts against the first shoulder, and the other side abuts against the shaft end baffle 220 installed at the end of the shift fork shaft 130.

[0050] Since both the shift handle 110 and the connecting rod 141 are connected to the shift fork shaft 130 through flat keys, the flat key has high structural strength, is not easily damaged during use, transmits torque stably and reliably, has a long service life, and low operating cost.

[0051] It should be understood that in order to obtain the position of the transmission gear sleeve 190 and thus judge the state of the flywheel 210, an induction component 160 is installed on the side of the box body 100. The induction component 160 can detect the position of the shift lever 110, and thus obtain the position of the transmission gear sleeve 190 through the position where the shift lever 110 is located, with high automation and safe and reliable use.

[0052] Please refer to Figure 5 , for example, in this embodiment, the induction component 160 is set to two groups. One group can emit a corresponding signal when the shift lever 110 is in the first position, and the other group can emit a corresponding signal when the shift lever 110 is in the second position. The shift lever 110 switches between the first position and the second position when rotating relative to the box body 100. When the shift lever 110 is in the first position, the transmission gear sleeve 190 meshes with the connecting gear sleeve 200, and the flywheel 210 rotates. When the shift lever 110 is in the first position, the transmission gear sleeve 190 is separated from the connecting gear sleeve 200, and the transmission gear sleeve 190 idles.

[0053] Please refer to Figure 6 , in this embodiment, optionally, one end of the connecting rod 141 is provided with a first concave-convex portion 143, and one end of the shift fork cover 142 is provided with a second concave-convex portion 144. The first concave-convex portion 143 and the second concave-convex portion 144 are inserted and matched. The combination of the connecting rod 141 and the shift fork cover 142 is firm, and the torque transmission is stable and reliable.

[0054] Furthermore, two threaded holes 145 are provided on the connecting rod 141, and two fixing lugs 146 are provided on the shift fork cover 142. A fixing member 147 is installed on each fixing lug 146. The fixing member 147 can be a bolt or the like. The two fixing members 147 are respectively screwed with the two threaded holes 145 to fix the shift fork cover 142 to the connecting rod 141. When it is necessary to replace the shift slider 150, the fixing member 147 is removed, and the shift fork cover 142 can be disassembled from the connecting rod 141, which is convenient to operate.

[0055] Please refer to Figure 2 and Figure 4, It should be noted that the installation structures of each shifting slider 150 and the corresponding shift fork cover 142 are the same. In this embodiment, to avoid redundant narration, the cooperation of one shifting slider 150 and the shift fork cover 142 is used for illustration. During installation, the positioning pin 300 penetrates through the corresponding shifting slider 150 and the shift fork cover 142 at the same time. The fixing nut 320 and the spacer ring 330 are both sleeved outside the positioning pin 300, and the fixing nut 320, the shift fork cover 142, the spacer ring 330, and the shifting slider 150 are arranged in sequence; the set screw 310 is tightened with the shift fork cover 142 and abuts against the positioning pin 300. It should be understood that the number of fixing nuts 320 can be two, and the two fixing nuts 320 are both screwed outside the positioning pin 300 to increase the locking force. Through the cooperation of the positioning pin 300, two fixing nuts 320, and a spacer ring 330, the position of the shifting slider 150 in the axial direction of the positioning pin 300 can be restricted. Through the set screw 310, the freedom degree of the positioning pin 300 relative to the shift fork cover 142 in its own circumferential direction can be restricted. It should be understood that after the two shifting sliders 150 are installed, the two shifting sliders 150 are coaxially arranged.

[0056] The shifting gearbox provided in this embodiment has a simple and reasonable structure, is easy to install, and the components are not easily damaged during operation, with a long service life. When it is necessary to replace the sliding slider, the shift fork cover 142 is disassembled from the connecting rod 141, and it is not necessary to disassemble the entire shift fork shaft and related components, which reduces the operation difficulty and improves the operation efficiency.

[0057] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A shift gearbox, characterized in that, Including: A housing (100), a shift lever (110), a shift fork shaft (130), two shift rods (140) and two shift sliders (150). The shift lever is connected to the shift fork shaft, and the shift fork shaft is rotatably connected to the housing (100); each shift rod (140) includes a connecting rod (141) and a fork cover (142), the connecting rod (141) is detachably connected to the fork cover (142), the connecting rods (141) of the two shift rods (140) are fixedly connected to the shift fork shaft (130), and the two shift rods (140) are arranged at intervals in the axial direction of the shift fork shaft (130); the two shift sliders (150) are respectively connected to the two connecting rods (141); the two shift sliders (150) are both used for connecting with a transmission gear sleeve (190).

2. The shift gearbox according to claim 1, wherein: An assembly hole is provided on the connecting rod (141), a keyway is provided on the inner wall of the assembly hole, the assembly hole is sleeved outside the shift fork shaft (130), and a flat key connected to the shift fork shaft (130) is embedded in the keyway.

3. The shift gearbox according to claim 1, wherein: A first concave-convex portion (143) is provided at one end of the connecting rod (141), a second concave-convex portion (144) is provided at one end of the fork cover (142), and the first concave-convex portion (143) is in plug-in fit with the second concave-convex portion (144).

4. The shift gearbox according to claim 1, wherein: A threaded hole (145) is provided on the connecting rod (141), a fixing lug (146) is provided on the fork cover (142), a fixing member (147) is installed on the fixing lug (146), and the fixing member (147) is in screw fit with the threaded hole (145) to fix the fork cover (142) on the connecting rod (141).

5. The shift gearbox according to claim 1, wherein: The shift gearbox further includes a retaining ring, the retaining ring is sleeved outside the shift fork shaft (130), and the connecting rod (141) is limited by two adjacent retaining rings or the connecting rod (141) is limited by one retaining ring and a shoulder provided outside the shift fork shaft (130) to fix the connecting rod (141) relative to the shift fork shaft (130) in the axial direction of the shift fork shaft (130).

6. The shift gearbox according to claim 1, wherein: The shift gearbox further includes a positioning pin (300), a set screw (310), a fixing nut (320) and a spacer ring (330). The positioning pin (300) penetrates through the shift slider (150) and the fork cover (142) at the same time. The fixing nut (320) and the spacer ring (330) are both sleeved outside the positioning pin (300). The fixing nut (320), the fork cover (142), the spacer ring (330) and the shift slider (150) are arranged in sequence. The set screw (310) is tightened with the fork cover (142) and abuts against the positioning pin (300).

7. The shift gearbox according to claim 1, wherein: The shift gearbox further includes a transparent cover (250). The transparent cover (250) is installed on the outside of the box body (100). The shift fork shaft (130) penetrates through the box body (100) and the transparent cover (250) at the same time. An oil seal (230) and a sealing ring (240) are arranged between the transparent cover (250) and the box body (100). The oil seal (230) is located outside the sealing ring (240).

8. The shift gearbox according to claim 7, wherein: The inner wall surface of the transparent cover (250) is provided with a first groove and a second groove. The oil seal (230) is arranged in the first groove, and the sealing ring (240) is arranged in the second groove.

9. The shift gearbox according to claim 1, wherein: The shift handle (110) is connected to the shift fork shaft (130) through a flat key structure.

10. The shift gearbox according to claim 1, wherein: The shift gearbox further includes an induction component. The induction component is installed on the box body and is used to obtain the position of the shift handle.

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