Gear sleeve limiting structure and gear shifting mechanism

Abstract

The invention discloses a gear sleeve limiting structure and a gear shifting mechanism, the gear sleeve limiting structure comprises a shaft body, a high-speed gear, a low-speed gear and a sliding gear sleeve, the high-speed gear and the low-speed gear are both fixed on the shaft body, the sliding gear sleeve is movably arranged between the high-speed gear and the low-speed gear, and the sliding gear sleeve achieves gear shifting by being connected with the high-speed gear or the low-speed gear. The gear diameter of the low-speed gear is relatively large, the sliding gear sleeve can be limited through the gear end while the low-speed gear is connected with the sliding gear sleeve, the gear diameter of the high-speed gear is relatively small, the high-speed gear is provided with the limiting piece, and when the high-speed gear is connected with the sliding gear sleeve, the sliding gear sleeve can be limited through the limiting piece, so that the sliding gear sleeve can be limited through the limiting piece. Therefore, the sliding gear sleeve is limited by the high-speed gear, and the gear sleeve limiting structure can limit the sliding gear sleeve in a high-speed gear environment with any tooth diameter.

Description

Technical Field

[0001] The present invention relates to the technical field of gear shifting mechanisms, and in particular to a gear sleeve limiting structure and a gear shifting mechanism. Background Art

[0002] With the development of the automobile industry, AMT and pure electric shifting mechanisms have ushered in development opportunities; the sliding sleeve shifting structure has higher reliability than the synchronizer shifting and is widely used.

[0003] The sliding gear sleeve is combined with the high-speed gear and the low-speed gear to realize the gear change. After the sliding gear sleeve is shifted, it needs to be limited by the blocking of the limiting structure. It is generally limited by the end faces of the high-speed gear and the low-speed gear. For example, the patent document with the announcement number CN218953969U discloses the sliding gear sleeve limiting structure of the output shaft of the loader shift mechanism. The limiting structure includes an input shaft, which is equipped with a sliding gear sleeve, and the fork groove of the sliding gear sleeve is equipped with a shift fork; the high-speed gear is installed on the left side of the sliding gear sleeve, and the low-speed gear is installed on the right side of the sliding gear sleeve; when the sliding gear sleeve slides to the left and right through the shift fork, it is connected with the high-speed gear and the low-speed gear to realize gear shifting, and is limited by the end faces of the high-speed gear and the low-speed gear.

[0004] Under normal circumstances, since the tooth diameter of the low-speed gear is larger and usually larger than the inner diameter of the sliding gear sleeve, its end face can better limit the sliding gear sleeve. However, for the high-speed gear, its tooth diameter is relatively small. When the outer diameter of the gear is smaller than the inner diameter of the sliding gear sleeve, its end face is difficult to limit the sliding gear sleeve. Therefore, the existing end face limiting structure is difficult to apply in the environment of high-speed gears with smaller tooth diameters. Summary of the invention

[0005] The purpose of the present invention is to overcome the above technical deficiencies and propose a gear sleeve limiting structure and a shifting mechanism to solve the technical problem that the gear sleeve limiting structure in the prior art is difficult to be applied to a high-speed gear environment with a small tooth diameter.

[0006] In order to achieve the above technical objectives, the present invention adopts the following technical solutions: In a first aspect, the present invention provides a gear sleeve limiting structure, comprising: Axis body; A high-speed gear connected to the shaft; A low-speed gear connected to the shaft and opposite to the high-speed gear; a sliding gear sleeve, movably disposed between the high-speed gear and the low-speed gear, and capable of connecting to the high-speed gear or the low-speed gear by moving toward the high-speed gear or the low-speed gear; and A limiting member is connected to the high-speed gear and is used to limit the movement of the sliding gear sleeve connected to the high-speed gear in a direction away from the low-speed gear.

[0007] In some embodiments, the limiting member includes a retaining ring, the retaining ring is fixed to the end of the high-speed gear, and the outer diameter of the retaining ring is greater than the inner diameter of the limiting member.

[0008] In some embodiments, the shaft body is provided with a gear hub, and a spline is provided on the inner side of the sliding gear sleeve. The spline is meshed with the gear hub and is slidingly connected to the gear hub. The spline can be connected to the high-speed gear or the low-speed gear by sliding the sliding gear sleeve toward the high-speed gear or the low-speed gear.

[0009] In some embodiments, the high-speed gear is provided with a first combining tooth, which is fixed to a side of the high-speed gear close to the low-speed gear; the low-speed gear is provided with a second combining tooth, which is fixed to a side of the low-speed gear close to the high-speed gear; the spline can be coupled to the first combining tooth or the second combining tooth by sliding the sliding gear sleeve toward the high-speed gear or the low-speed gear.

[0010] In some embodiments, the shaft body is also provided with a limiting gear ring, which is meshed with the gear hub and can be disengaged from the gear hub by sliding the sliding gear sleeve toward the high-speed gear and the low-speed gear. The limiting gear ring that is disengaged from the gear hub can limit the sliding gear sleeve by abutting against the end face of the gear hub.

[0011] In some embodiments, the limiting gear ring is integrally formed with the spline.

[0012] In some embodiments, the tooth height of the limiting gear ring is the same as the tooth height of the spline, and the tooth thickness of the limiting gear ring is greater than the tooth thickness of the spline, so that both sides of each tooth of the limiting gear ring protrude from the spline.

[0013] In some embodiments, the tooth end of the limiting gear ring is provided with an abutment inclined surface, and the limiting gear ring that escapes from the gear hub can abut against the end surface of the gear hub through the abutment inclined surface.

[0014] In some embodiments, when the sliding gear sleeve abuts against the limiting member or the low-speed gear, the limiting gear ring abuts against the gear hub.

[0015] In a second aspect, the present invention further provides a shifting mechanism, comprising the gear sleeve limiting structure.

[0016] Compared with the prior art, the gear sleeve limiting structure provided by the present invention is provided by setting a shaft body, a high-speed gear, a low-speed gear and a sliding gear sleeve. The high-speed gear and the low-speed gear are both fixed to the shaft body. The sliding gear sleeve is movably arranged between the high-speed gear and the low-speed gear. The sliding gear sleeve realizes gear shifting by connecting the high-speed gear or the low-speed gear, thereby realizing output of different gears. The wheel diameter of the low-speed gear is relatively large, and the sliding gear sleeve can be limited by the wheel end while being connected to the sliding gear sleeve. Since the wheel diameter of the high-speed gear is relatively small, the high-speed gear can also limit the sliding gear sleeve by the limiting member when the high-speed gear is connected to the sliding gear sleeve, thereby ensuring the limitation of the sliding gear sleeve by the high-speed gear, and then the gear sleeve limiting structure can limit the sliding gear sleeve in a high-speed gear environment with any tooth diameter. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a cross-sectional view of a gear sleeve limiting structure provided by an embodiment of the present invention; Figure 2 It is a cross-sectional view of the shaft of the low-speed gear hidden in the gear sleeve limiting structure provided by an embodiment of the present invention; Figure 3 is a cross-sectional view of a sliding gear sleeve provided in an embodiment of the present invention; Figure 4 yes Figure 3 A partial enlarged view of the middle A; Figure 5 is along Figure 4 Sectional view along line KK.

[0018] Figure 6 is along Figure 4 Sectional view of the center FF line Reference numerals in the figures: 10 - shaft 11 - gear hub 12 - first shaft 13—Second shaft 20—High speed gear 21—First combined gear 22 - first pinion 23 - second pinion 30 - low speed gear 31 - second combined tooth 32 - first large gear 33 - second large gear 40 - sliding gear sleeve 41 - spline 42 - limit gear ring 50—limiting member 421—abutting inclined surface. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0020] In order to solve the technical problem of the relatively complex structure of the gear sleeve limiting structure in the prior art, the present invention provides a gear sleeve limiting structure, which can ensure that the gear sleeve limiting structure can limit the sliding gear sleeve in a high-speed gear environment with any tooth diameter.

[0021] The gear sleeve limiting structure provided in the embodiment of the present invention is as follows: Figure 1-2 As shown, it includes a shaft body 10, a high-speed gear 20, a low-speed gear 30, a sliding gear sleeve 40 and a limiting member 50. The high-speed gear 20 and the low-speed gear 30 are both connected to the shaft body 10; the low-speed gear 30 is opposite to the high-speed gear 20; the sliding gear sleeve 40 is movably arranged between the high-speed gear 20 and the low-speed gear 30, and can be connected to the high-speed gear 20 or the low-speed gear 30 by moving toward the high-speed gear 20 or the low-speed gear 30; the limiting member 50 is connected to the high-speed gear 20, and is used to limit the movement of the sliding gear sleeve 40 connected to the high-speed gear 20 in the direction away from the low-speed gear 30.

[0022] Specifically, the gear sleeve limiting structure is provided by setting a shaft body 10, a high-speed gear 20, a low-speed gear 30 and a sliding gear sleeve 40. The high-speed gear 20 and the low-speed gear 30 are both fixed to the shaft body 10. The sliding gear sleeve 40 is movably provided between the high-speed gear 20 and the low-speed gear 30. The sliding gear sleeve 40 realizes gear shifting by connecting the high-speed gear 20 or the low-speed gear 30, thereby realizing output of different gears. The wheel diameter of the low-speed gear 30 is relatively large. When the sliding gear sleeve 40 is connected, the sliding gear sleeve 40 can be limited by the wheel end. Since the wheel diameter of the high-speed gear 20 is relatively small, the high-speed gear 20 is provided with a limiting member 50. When the high-speed gear 20 is connected to the sliding gear sleeve 40, the sliding gear sleeve 40 can also be limited by the limiting member 50, thereby ensuring that the high-speed gear 20 limits the sliding gear sleeve 40, and then the gear sleeve limiting structure can limit the sliding gear sleeve 40 in a high-speed gear environment with any tooth diameter, thereby ensuring the stability of the sliding gear sleeve 40.

[0023] In this embodiment, the shaft body 10 may be a single transmission shaft, or a plurality of rotatably connected transmission shafts.

[0024] In this embodiment, the high-speed gear 20 and the low-speed gear 30 can be fixedly connected or rotatably connected to the shaft body 10 .

[0025] In this embodiment, the tooth diameter of the high-speed gear 20 is relatively small, and a higher rotation speed is transmitted to the sliding gear sleeve 40 by connecting with the sliding gear sleeve 40. The outer diameter of the high-speed gear 20 is usually smaller than the outer diameter of the sliding gear sleeve 40. The movement of the sliding gear sleeve 40 toward the high-speed gear 20 can be blocked by the limiting member 50 for limiting the sliding gear sleeve 40. The tooth diameter of the low-speed gear 30 is relatively large, and a lower rotation speed is transmitted to the sliding gear sleeve 40 by connecting with the sliding gear sleeve 40. The outer diameter of the low-speed gear 30 is usually larger than the outer diameter of the sliding gear sleeve 40, so that the low-speed gear 30 can block the sliding gear sleeve 40 only by its end face, and no other additional limiting structure is required.

[0026] In this embodiment, the sliding gear sleeve 40 is in an intermediate position (not connected to the high-speed gear 20 and the low-speed gear 30) Figure 2 ), the sliding gear sleeve 40 is in a neutral position and does not transmit power.

[0027] In one embodiment, Figure 1-2 As shown, the shaft body 10 is provided with a gear hub 11, and a spline 41 is provided on the inner side of the sliding gear sleeve 40. The spline 41 is meshed with the gear hub 11 and slidably connected with the gear hub 11. The spline 41 can be connected to the high-speed gear 20 or the low-speed gear 30 by sliding the sliding gear sleeve 40 toward the high-speed gear 20 or the low-speed gear 30. Specifically, the sliding gear sleeve 40 can be combined with the gear hub 11 through the inner spline 41. During the rotation of the sliding gear sleeve 40, the gear hub 11 is driven to rotate synchronously, thereby driving the shaft body 10 to rotate; when the sliding gear sleeve 40 is connected to the high-speed gear 20, the high-speed gear 20 can transmit power to the shaft body 10, thereby driving the shaft body 10 to rotate synchronously, and realizing the transmission of power from the high-speed gear 20 to the shaft body 10; when the sliding gear sleeve 40 is connected to the low-speed gear 30, the low-speed gear 30 can transmit power to the shaft body 10, thereby driving the shaft body 10 to rotate synchronously, and realizing the transmission of power from the low-speed gear 30 to the shaft body 10.

[0028] In this embodiment, the gear hub 11 is interference fit with the shaft body 10 to achieve connection and fixation with the shaft body 10 .

[0029] It can be understood that the sliding gear sleeve 40 can be connected to the high-speed gear 20 and the low-speed gear 30 by moving toward the high-speed gear 20 and the low-speed gear 30 to form a plug-in interlocking form with the high-speed gear 20 and the low-speed gear 30. Alternatively, the sliding gear sleeve 40 can be connected to the high-speed gear 20 by moving toward the high-speed gear 20 and the inner side thereof can be meshed with the outer side of the high-speed gear 20; and the sliding gear sleeve 40 can be connected to the low-speed gear 30 by moving toward the low-speed gear 30 and the outer side thereof can be meshed with the inner side of the low-speed gear 30.

[0030] In one embodiment, Figure 1-2As shown, the high-speed gear 20 is provided with a first combining tooth 21, which is fixed to a side of the high-speed gear 20 close to the low-speed gear 30, and the low-speed gear 30 is provided with a second combining tooth 31, which is fixed to a side of the low-speed gear 30 close to the high-speed gear 20, and the spline 41 can be coupled to the first combining tooth 21 or the second combining tooth 31 by sliding the sliding gear sleeve 40 toward the high-speed gear 20 or the low-speed gear 30. Specifically, when the sliding gear sleeve 40 slides toward the high-speed gear 20, its side close to the high-speed gear 20 is combined with the first combining tooth 21 to achieve connection with the high-speed gear 20, and the other side of the sliding gear sleeve 40 is meshed with the gear hub 11. When the high-speed gear 20 rotates, it drives the sliding gear sleeve 40 to rotate, and finally drives the gear hub 11 and the shaft body 10 to rotate, thereby realizing the transmission of power from the high-speed gear 20 to the shaft body 10; when the sliding gear sleeve 40 slides toward the low-speed gear 30, its side close to the low-speed gear 30 is combined with the first combining tooth 21 to achieve connection with the low-speed gear 30, and the other side of the sliding gear sleeve 40 is meshed with the gear hub 11. When the low-speed gear 30 rotates, it drives the sliding gear sleeve 40 to rotate, and finally drives the gear hub 11 and the shaft body 10 to rotate, thereby realizing the transmission of power from the low-speed gear 30 to the shaft body 10.

[0031] In this embodiment, the parameters (including the number of teeth, module and pressure angle, etc.) of the first combining tooth 21, the second combining tooth 31 and the gear hub 11 are the same, and they can all be combined with the spline 41 on the inner side of the sliding gear sleeve 40. The spline 41 on the inner side of the sliding gear sleeve 40 maintains a constant meshing state with the gear hub 11.

[0032] It can be understood that the limit member 50 can be connected to the end face of the high-speed gear 20, the middle part, or any other position that can block the sliding gear sleeve 40 from further moving toward the high-speed gear 20. The limit member 50 can be a limit member 50 of any structure such as a limit rod, a limit protrusion, etc. that can block the sliding gear sleeve 40 from further moving toward the high-speed gear 20. The limit member 50 can be connected to the high-speed gear 20 in a fixed connection, a rotational connection, or the like.

[0033] In one embodiment, Figure 1-2 As shown, the limiting member 50 includes a retaining ring, which is fixed to the end of the high-speed gear 20 , and the outer diameter of the retaining ring is greater than the inner diameter of the limiting member 50 .

[0034] In this embodiment, the retaining ring is fixed to the end surface of the high-speed gear 20 by welding.

[0035] In one embodiment, in order to prevent the sliding gear sleeve 40 from being disengaged, as shown in FIG. Figure 3-4As shown, the shaft body 10 is also provided with a limiting gear ring 42, which is meshed with the gear hub 11 and can be disengaged from the gear hub 11 by sliding the sliding gear sleeve 40 toward the high-speed gear 20 and the low-speed gear 30. The limiting gear ring 42 disengaged from the gear hub 11 can be limited by abutting the sliding gear sleeve 40 with the end face of the gear hub 11.

[0036] Specifically, when the sliding gear sleeve 40 slides toward the high-speed gear 20, its side close to the high-speed gear 20 is combined with the first combining tooth 21, and the end of the sliding gear sleeve 40 close to the high-speed gear 20 abuts against the limiting member 50, and the limiting gear ring 42 slides out of the gear hub 11. After the limiting gear ring 42 is separated from the gear hub 11, it can form an abutment with the end face of the gear hub 11. Under the abutment of the end face of the gear hub 11, the sliding gear sleeve 40 is blocked from sliding in the direction away from the high-speed gear 20, thereby preventing the sliding gear sleeve 40 from being separated from the first combining tooth 21 and being disengaged from the high-speed gear 20; When the movable gear sleeve 40 slides toward the low-speed gear 30, its side close to the low-speed gear 30 is combined with the second combining tooth 31, and the end of the sliding gear sleeve 40 close to the low-speed gear 30 abuts against the end face of the low-speed gear 30, and the limiting gear ring 42 slides out of the gear hub 11. After the limiting gear ring 42 is separated from the gear hub 11, it can form an abutment with the other end face of the gear hub 11. Under the abutment of the end face of the gear hub 11, the sliding gear sleeve 40 is blocked from sliding in the direction away from the low-speed gear 30, thereby preventing the sliding gear sleeve 40 from disengaging from the second combining tooth 31 and disengaging from the low-speed gear 30.

[0037] In this embodiment, the limiting gear ring 42 is located in the middle of the sliding gear sleeve 40 , and the distance between the limiting gear ring 42 and the end faces of the two ends of the sliding gear sleeve 40 is the same.

[0038] In one embodiment, when the sliding gear sleeve 40 abuts against the limiting member 50 or the low-speed gear 30, the limiting gear ring 42 abuts against the gear hub 11. Specifically, when one end of the sliding gear sleeve 40 close to the low-speed gear 30 abuts against the limiting member 50, the limiting gear ring 42 happens to abut against the end face of the gear hub 11 close to the high-speed gear 20, thereby limiting the sliding of the sliding gear sleeve 40 on both sides, so that the sliding gear sleeve 40 remains stable; when one end of the sliding gear sleeve 40 close to the low-speed gear 30 abuts against the end face of the low-speed gear 30, the limiting gear ring 42 happens to abut against the end face of the gear hub 11 close to the low-speed gear 30, thereby limiting the sliding of the sliding gear sleeve 40 on both sides, so that the sliding gear sleeve 40 remains stable.

[0039] In this embodiment, the distance between the limit gear ring 42 and the end face of the sliding gear sleeve 40 close to the high-speed gear 20 is the same as the distance between the limit member 50 and the end face of the gear hub 11 close to the high-speed gear 20, so that when the end face of the sliding gear sleeve 40 close to the high-speed gear 20 abuts against the limit member 50, the limit gear ring 42 can just abut against the end face of the gear hub 11 close to the high-speed gear 20; the distance between the limit gear ring 42 and the end face of the sliding gear sleeve 40 close to the low-speed gear 30 is the same as the distance between the low-speed gear 30 and the end face of the gear hub 11 close to the low-speed gear 30, so that when the end face of the sliding gear sleeve 40 close to the low-speed gear 30 abuts against the low-speed gear 30, the limit gear ring 42 can just abut against the end face of the gear hub 11 close to the low-speed gear 30.

[0040] It can be understood that the limiting gear ring 42 can be formed on the spline 41 inside the sliding gear sleeve 40, or formed on the inner wall of the sliding gear sleeve 40, dividing the spline 41 of the limiting gear ring 42 into two parts from the middle, or formed on the spline 41.

[0041] In one embodiment, the limiting gear ring 42 is integrally formed with the spline 41. Specifically, by integrally forming the limiting gear ring 42 with the spline 41, the manufacturing cost of the sliding gear sleeve 40 can be effectively reduced, and only an additional tooth-shaped structure needs to be separately formed on the original structure of the spline 41, thereby simplifying the limiting structure of the sliding gear sleeve 40.

[0042] In this embodiment, the number of teeth of the limiting gear ring 42 is equal to the number of teeth of the inner spline 41 of the sliding gear sleeve 40 .

[0043] It is understandable that the number of teeth of the limiting gear ring 42 may be smaller than the number of teeth of the inner spline 41 of the sliding gear sleeve 40 , and it is only necessary for the limiting gear ring 42 to be able to mesh with the gear hub 11 .

[0044] In one embodiment, Figure 3-6As shown, the tooth height of the limiting gear ring 42 is the same as the tooth height of the spline 41 , and the tooth thickness of the limiting gear ring 42 is greater than the tooth thickness of the spline 41 , so that both sides of each tooth of the limiting gear ring 42 protrude from the spline 41 . Specifically, since the tooth thickness of the limiting gear ring 42 is greater than the tooth thickness of the spline 41, splines 41 protrude on both sides of each tooth of the limiting gear ring 42, so that when the limiting gear ring 42 is meshed with the gear hub 11, there is a tiny gap between the spline 41 and the involute of the gear hub 11. After the sliding gear sleeve 40 is combined with the first combining tooth 21 or the second combining tooth 31 by sliding, and the limiting gear ring 42 is disengaged from the gear hub 11, the high-speed gear 20 or the low-speed gear 30 drives the sliding gear sleeve 40 to rotate. After the sliding gear sleeve 40 rotates at a small angle, this part of the gap is eliminated, and the involute of the spline 41 is completely fitted with the gear hub 11. At this time, the part of the limiting gear ring 42 protruding from the spline 41 is misaligned with the tooth groove of the gear hub 11, and then abuts against the end face of the gear hub 11, thereby limiting the sliding of the sliding gear sleeve 40 toward the gear hub 11.

[0045] It can be understood that the limiting gear ring 42 can also be offset with the spline 41 on the inner side of the sliding gear sleeve 40, so that there is a gap between the involute of the spline 41 of the gear sleeve and the gear hub 11. After the sliding gear sleeve 40 is combined with the first combining tooth 21 or the second combining tooth 31 by sliding, and the limiting gear ring 42 is disengaged from the gear hub 11, the high-speed gear 20 or the low-speed gear 30 drives the sliding gear sleeve 40 to rotate. After the sliding gear sleeve 40 rotates at a small angle, the involute of the spline 41 of the sliding gear sleeve 40 is completely fitted with the gear hub 11. Due to the misalignment of the limiting gear ring 42 and the spline 41 on the inner side of the sliding gear sleeve 40, the teeth of the limiting gear ring 42 are misaligned with the tooth grooves of the gear hub 11. At this time, the sliding of the sliding gear sleeve 40 toward the gear hub 11 can be limited by the limiting gear ring 42.

[0046] In one embodiment, Figure 3-4 As shown, the tooth end of the limiting gear ring 42 is provided with an abutting inclined surface 421, and the limiting gear ring 42 that escapes from the gear hub 11 can abut against the end surface of the gear hub 11 through the abutting inclined surface 421. Specifically, the limiting gear ring 42 achieves the limitation of the sliding gear sleeve 40 through the abutment of the abutting inclined surface 421 and the end surface of the gear hub 11. Through the setting of the abutting inclined surface 421, when shifting, the sliding gear sleeve 40 can slide toward the gear hub 11 again under the drive of the shift fork, so that the limiting gear ring 42 is combined with the gear hub 11, thereby facilitating the shifting.

[0047] In this embodiment, the abutting inclined surface 421 is connected to the spline 41 .

[0048] In this embodiment, Figure 1As shown, the shaft body 10 includes a first shaft 12 and a second shaft 13, and the first shaft 12 and the second shaft 13 are rotatably connected. The high-speed gear 20 of the gear sleeve limiting structure includes a first pinion 22 and a second pinion 23, the first pinion 22 is welded to the first shaft 12, and the second pinion 23 is rotatably connected to the second shaft 13. The low-speed gear 30 includes a first large gear 32 and a second large gear 33, the first large gear 32 is rotatably connected to the second shaft 13 and is opposite to the first pinion 22, the second large gear 33 is rotatably connected to the second shaft 13 and is opposite to the second pinion 23, and the gear hub 11 of the gear sleeve limiting structure is set between the first pinion 22 and the first large gear The gear 32 and the second pinion 23 and the second large gear 33 are interferingly matched with the two shafts 13. The inner side of the sliding gear sleeve 40 of the gear sleeve limiting structure meshes with the gear hub 11 of the gear sleeve limiting structure, and can slide to the left and right sides under the drive of the shift fork, and is combined with the combined teeth of the first pinion 22, the first large gear 32, the second pinion 23 and the second large gear 33 to achieve shifting. The sliding gear sleeve 40 is limited under the action of the retaining ring of the first pinion 22 and the second pinion 23, the end faces of the first large gear 32 and the second large gear 33 and the limiting gear ring 42, thereby preventing the sliding gear sleeve 40 from being disengaged. The gear sleeve limiting structure can limit the sliding gear sleeve 40 in a high-speed gear environment with any tooth diameter, thereby ensuring the stability of the sliding gear sleeve 40. The limiting of the limiting gear ring 42 can provide a limit for the sliding gear sleeve 40 to prevent the sliding gear sleeve 40 from being disengaged, and can also effectively simplify the limiting structure, thereby reducing the production cost and failure rate of the shifting mechanism.

[0049] The embodiment of the present invention further provides a shift mechanism, including the above-mentioned gear sleeve limiting structure. Specifically, the shift mechanism can ensure that the high-speed gear 20 limits the sliding gear sleeve 40 by setting the above-mentioned gear sleeve limiting structure, so that the gear sleeve limiting structure can limit the sliding gear sleeve 40 in a high-speed gear environment with any tooth diameter, thereby ensuring the stability of the sliding gear sleeve 40, and being able to provide a limit for the sliding gear sleeve 40 while effectively simplifying the limiting structure, thereby reducing the production cost and failure rate of the shift mechanism.

[0050] The specific implementation of the present invention described above does not constitute a limitation on the protection scope of the present invention. Any other corresponding changes and modifications made based on the technical concept of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A gear sleeve limiting structure, characterized in that: include: Axis body; A high-speed gear connected to the shaft; A low-speed gear connected to the shaft and opposite to the high-speed gear; A sliding gear sleeve, movably disposed between the high-speed gear and the low-speed gear, and capable of connecting the high-speed gear or the low-speed gear by moving toward the high-speed gear or the low-speed gear; and A limiting member is connected to the high-speed gear and is used to limit the movement of the sliding gear sleeve connected to the high-speed gear in a direction away from the low-speed gear.

2. The gear sleeve limiting structure according to claim 1, characterized in that: The limiting member comprises a retaining ring, the retaining ring is fixed to the end of the high-speed gear, and the outer diameter of the retaining ring is greater than the inner diameter of the limiting member.

3. The gear sleeve limiting structure according to claim 1, characterized in that: The shaft body is provided with a gear hub, and a spline is provided on the inner side of the sliding gear sleeve. The spline is meshed with the gear hub and slidably connected with the gear hub. The spline can be connected to the high-speed gear or the low-speed gear by sliding the sliding gear sleeve toward the high-speed gear or the low-speed gear.

4. The gear sleeve limiting structure according to claim 3, characterized in that: The high-speed gear is provided with a first combining tooth, which is fixed to a side of the high-speed gear close to the low-speed gear; the low-speed gear is provided with a second combining tooth, which is fixed to a side of the low-speed gear close to the high-speed gear; the spline can be combined with the first combining tooth or the second combining tooth by sliding the sliding gear sleeve toward the high-speed gear or the low-speed gear.

5. The gear sleeve limiting structure according to claim 3, characterized in that: The shaft body is also provided with a limiting gear ring, which is meshed with the gear hub and can be disengaged from the gear hub by sliding the sliding gear sleeve toward the high-speed gear and the low-speed gear. The limiting gear ring that is disengaged from the gear hub can limit the sliding gear sleeve by abutting against the end face of the gear hub.

6. The gear sleeve limiting structure according to claim 5, characterized in that: The limiting gear ring is integrally formed with the spline.

7. The gear sleeve limiting structure according to claim 5, characterized in that: The tooth height of the limiting gear ring is the same as the tooth height of the spline, and the tooth thickness of the limiting gear ring is greater than the tooth thickness of the spline, so that both sides of each tooth of the limiting gear ring protrude from the spline.

8. The gear sleeve limiting structure according to claim 5, characterized in that: The tooth end of the limiting gear ring is provided with an abutting inclined surface, and the limiting gear ring that escapes from the gear hub can abut against the end surface of the gear hub through the abutting inclined surface.

9. The gear sleeve limiting structure according to claim 5, characterized in that: When the sliding gear sleeve abuts against the limiting member or the low-speed gear, the limiting gear ring abuts against the gear hub.

10. A gear shifting mechanism, characterized in that: It comprises the gear sleeve limiting structure as described in any one of claims 1 to 9.

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