Three-gear shifting assembly and rear gearbox

Abstract

The three-gear shifting assembly comprises a shifting fork shaft and a shifting plate, and the shifting fork shaft is provided with a plurality of shifting forks which are in sliding connection in the axial direction of the shifting fork shaft; a plurality of strip-shaped grooves are formed in the gear shifting plate, and the shifting forks are connected into the strip-shaped grooves in a sliding mode, so that the shifting forks are driven by the gear shifting plate to slide in the axial direction of the shifting fork shaft, and the shifting forks are driven to push the synchronizer to slide in the axial direction. The strip-shaped groove is formed in the gear shifting plate, and the gear shifting plate rotates in the horizontal direction to enable the strip-shaped groove to drive the shifting fork to move to achieve gear shifting, so that the overall structure is compact, occupied space is reduced, and the situation that the axial moving distance is too long due to the fact that the shifting fork is driven in an axial interval mode is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of electric tricycles, in particular to a three-speed shift assembly and a rear gearbox. Background Art

[0002] With the improvement of environmental protection requirements and the development of new energy technologies, electric tricycles have gradually replaced the original fuel tricycles. At the same time, in order to provide sufficient power output transmission to meet the different usage conditions of electric tricycles such as no-load, load, full load or climbing, the rear gearbox of electric tricycles is mostly a three-speed shift gearbox.

[0003] At present, most of the three-speed transmission structures of the gearbox on the market are realized by controlling the shift fork to shift the synchronizer to connect different gears for transmission. One end of the shift fork is semicircularly sleeved on the synchronizer to drive the synchronizer axial movement, but does not affect its rotation. The other end is slidably sleeved on the shift fork shaft, and the synchronizer is moved by moving the shift fork shaft along its axial direction. However, the shift fork space of this setting is limited, the axial space required is long, and when there are many gears, the shifting distance is large, making it difficult to complete the gear shift. Utility Model Content

[0004] In view of the deficiencies in the prior art, the utility model provides a three-speed shift assembly and a rear-mounted gearbox to solve the technical problems in the related technology that the shift fork space in the gearbox is limited, the axial space required is relatively long, and when there are many gears, the shifting distance is large, making it difficult to complete the gear shift.

[0005] The utility model provides a three-speed shift assembly, comprising a shift fork shaft and a shift plate, wherein the shift fork shaft is provided with a plurality of shift forks slidably connected along its axial direction; the shift plate is provided with a plurality of strip grooves, the shift forks are slidably connected in the strip grooves, so as to drive the shift forks to slide along the axial direction of the shift fork shaft through the shift plate, and drive the shift forks to push the synchronizer to slide axially.

[0006] Furthermore, the shift plate is provided with two shaped grooves; the shift fork shaft is provided with two shift forks, which are staggered and slidably connected in one shaped groove in a one-to-one correspondence.

[0007] Furthermore, the shift fork includes a cylindrical head, and the head is slidably connected in the strip groove.

[0008] Furthermore, the shift fork also includes a sleeve which is sleeved on the shift fork shaft and can slide along its axial direction, and the head is fixedly connected to the sleeve.

[0009] Furthermore, a shift lever for driving the shift plate to rotate in a horizontal direction is further provided on one side of the shift plate, so that the shift plate can be rotated by the shift lever and the shift fork can be driven to slide axially along the shift fork shaft.

[0010] Furthermore, a straight slot is formed through the shift plate, and one end of the shift rod is clamped in the straight slot.

[0011] Furthermore, a shift plate is provided on the shift lever.

[0012] Furthermore, the shift lever is provided with a shift block, a plurality of shift slots are formed on the shift block, and a limiting member for limiting the rotation of the shift block is also provided on one side of the shift block, and one end of the limiting member is elastically pressed in a shift slot.

[0013] Furthermore, the limiting member is driven by a spring to move it closer to or farther from the shifting slot.

[0014] The utility model also provides a rear-mounted gearbox, comprising the above-mentioned three-speed shift assembly.

[0015] Compared with the prior art, the utility model has the following beneficial effects:

[0016] The three-speed shift assembly of the utility model provides a strip groove on the shift plate, and the shift plate rotates horizontally so that the strip groove drives the shift fork to move to achieve shifting, thereby making the overall structure compact, reducing space occupation, and avoiding excessive axial activity distance caused by driving the shift fork in an axial spacing manner.

[0017] The three-speed shift assembly of the utility model rotates the shift plate in the horizontal direction, and the shift plate drives the shift fork to slide along the axial direction of the shift fork shaft, and drives the shift fork to push the synchronizer to slide axially, so that the synchronizer cooperates with the corresponding gear ring on the transmission gear set, thereby completing the shifting. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a front view of a three-speed shift assembly according to an embodiment of the present utility model;

[0019] Figure 2 It is a front view of a three-speed shift assembly according to an embodiment of the present utility model;

[0020] Figure 3 It is a schematic diagram of a shift plate in a three-speed shift assembly according to an embodiment of the present utility model;

[0021] Figure 4 It is a schematic diagram of a three-speed shift assembly according to an embodiment of the present utility model;

[0022] Description of Figure Numbers:

[0023] 100, fork shaft;

[0024] 200, shift plate; 210, strip groove; 220, straight notch;

[0025] 300, shift fork; 310, head; 320, sleeve;

[0026] 400, shift lever; 500, shift plate;

[0027] 600, shift block, 610, shift slot;

[0028] 700. Limiting parts.

[0029] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solution and beneficial effects of the utility model more clear, the technical solution of the utility model is further described below in conjunction with the drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0031] In the description of the utility model, it should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of the specification are only used to match the contents disclosed in the specification for people familiar with the technology to understand and read, and are not used to limit the limiting conditions that the utility model can be implemented, so they have no substantial technical significance. Any modification of the structure, change of the proportional relationship or adjustment of the size, without affecting the effect that the utility model can produce and the purpose that can be achieved, should still fall within the scope of the technical content disclosed by the utility model. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of description, and are not used to limit the scope of the implementation of the utility model. The change or adjustment of the relative relationship, without substantial change of the technical content, should also be regarded as the scope of the implementation of the utility model.

[0032] like Figure 1-2 As shown, an embodiment of the utility model provides a three-speed shift assembly, including a fork shaft 100 and a shift plate 200, wherein the fork shaft 100 is provided with a plurality of shift forks 300 slidably connected along its axial direction; the shift plate 200 is provided with a plurality of strip grooves 210, and the shift forks 300 are slidably connected in the strip grooves 210, so as to drive the shift forks 300 to slide axially along the fork shaft 100 through the shift plate 200, and drive the shift forks 300 to push the synchronizer to slide axially.

[0033] In the embodiment of the utility model, by setting a strip groove 210 on the shift plate 200, under the action of manual or automatic external force, the shift plate 200 is rotated in the horizontal direction so that the strip groove 210 drives the shift fork 300 to move to achieve shifting, thereby making the overall structure compact, reducing space occupancy, and avoiding excessive axial activity distance caused by driving the shift fork 300 in an axial spacing manner.

[0034] like Figure 1-3 As shown, in the embodiment of the utility model, the shift plate 200 is provided with two strip-shaped grooves 210; the shift fork shaft 100 is provided with two shift forks 300, which are staggered and slidably connected in a strip-shaped groove 210 one by one, wherein the two strip-shaped grooves 210 have different shapes to achieve different moving distances, and the staggered shift forks 300 can balance the distribution of force, reduce the unbalanced force on the shift fork shaft 100, reduce vibration and noise, improve the stability and reliability of the transmission system, and at the same time achieve smoother and more stable shifting action, and reduce the occurrence of misoperation and gear shifting.

[0035] In this embodiment, when the shift plate 200 rotates in the horizontal direction, the shift fork 300 can move axially along the shift fork shaft 100 under the action of the strip groove 210, so as to drive the shift fork 300 to move in the same direction with it, so that the shift fork 300 can push the synchronizer's gear sleeve to move in the same direction, thereby combining with the corresponding gear ring on the transmission gear set to achieve the purpose of fast shifting, while reducing the transmission gap therebetween, which can make the shifting smoother.

[0036] In this embodiment, by providing two strip grooves 210 and two shift forks 300, it is possible to transform the three gear positions of normal, boost and acceleration. Specifically, each strip groove 210 has three shift nodes, which correspond to the three gear positions of normal, boost and acceleration respectively. When the shift plate 200 is rotated in the horizontal direction (i.e., rotated within the angle range corresponding to the shift interval), the shift fork 300 will move axially along the shift fork shaft 100 under the action of the strip groove 210, and be located at a shift node, while driving the synchronizer to move to complete the gear shifting work.

[0037] like Figure 1-2 As shown, in the embodiment of the utility model, in order to make the fork shaft 100 slide more smoothly and reduce vibration and noise, the fork 300 includes a cylindrical head 310, and the head 310 is slidably connected in the strip groove 210. At the same time, when the cylindrical head 310 slides in the groove, the pressure can be more evenly distributed on the contact surface, reducing the possibility of local stress concentration, reducing the wear of the contact surface, extending the service life of the components, and reducing maintenance costs.

[0038] like Figure 1-2As shown, in the embodiment of the utility model, in order to install the fork 300 on the fork shaft 100, the fork 300 is slidably arranged on the fork shaft 100 through the sleeve 320, and the head 310 is fixedly connected to the sleeve 320 to form a whole, so that when the head 310 moves, the fork 300 also moves axially on the fork shaft 100.

[0039] like Figure 1-3 As shown, in the embodiment of the utility model, a shift lever 400 for driving the shift plate 200 to rotate in the horizontal direction is further provided on one side of the shift plate 200, so that the shift plate 200 is rotated by the shift lever 400, and the shift fork 300 is driven to slide axially along the shift fork shaft 100; when shifting is required, the shift plate 200 is rotated in its circumferential direction by rotating the shift lever 400 to achieve angle change for shifting.

[0040] like Figure 1-3 As shown, in the embodiment of the utility model, a straight slot 220 is opened through the shift plate 200, and one end of the shift lever 400 is clamped in the straight slot 220 to facilitate the installation and removal of the shift lever 400. At the same time, in order to facilitate the rotation of the shift lever 400, a shift plate 500 is provided on the shift lever 400.

[0041] like Figure 4 As shown, in the embodiment of the utility model, the shift lever 400 is provided with a shift block 600, and a plurality of shift slots 610 are formed on the shift block 600. A stopper 700 for limiting the rotation of the shift block 600 is also provided on one side of the shift block 600. One end of the stopper 700 is elastically pressed in a shift slot 610. In the embodiment, there are three shift slots 610, which correspond to the three gears of normal, boost and acceleration respectively, and each shift slot 610 corresponds to 35 degrees.

[0042] When shifting gears, under the action of manual or automatic external force, the shift block 600 rotates with the rotation of the shift plate 500 under the action of the shift lever 400, and the shift block 600 will slide relative to the limit member 700. The limit member 700 can slide into the previous or next gear slot 610 to shift gears, and at the same time, it can also prevent the shift plate 500 from changing gears when it is accidentally hit by external force. In addition, in order to facilitate the return of the shift plate 500, the limit member 700 is driven by a spring to make it close to or away from the gear slot 610, giving the shift block 600 a certain clamping force limit, thereby preventing the shift lever 400 from rotating at will and ensuring the accurate position of the gear slot 610.

[0043] A rear-mounted gearbox is also provided in this embodiment, wherein the rear-mounted gearbox includes the above-mentioned three-speed shift assembly. Since all the technical solutions of the above-mentioned embodiments are adopted in this embodiment, it has at least all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, and thus they are not described one by one here.

[0044] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model.

Claims

1. A three-speed shift assembly, characterized in that: The invention comprises a shift fork shaft (100) and a shift plate (200), wherein the shift fork shaft (100) is provided with a plurality of shift forks (300) slidably connected along the axial direction thereof; the shift plate (200) is provided with a plurality of strip grooves (210), and the shift forks (300) are slidably connected in the strip grooves (210), so that the shift forks (300) are driven to slide along the axial direction of the shift fork shaft (100) through the shift plate (200), and the shift forks (300) are driven to push the synchronizer to slide axially.

2. A three-speed shift assembly as claimed in claim 1, characterized in that: The shift plate (200) is provided with two strip-shaped grooves (210); the shift fork shaft (100) is provided with two shift forks (300), which are arranged alternately and slidably connected in a strip-shaped groove (210) in a one-to-one correspondence.

3. A three-speed shift assembly as claimed in claim 1, characterized in that: The shift fork (300) comprises a cylindrical head (310), and the head (310) is slidably connected in the strip-shaped groove (210).

4. A three-speed shift assembly as claimed in claim 3, characterized in that: The shift fork (300) further comprises a sleeve (320) which is sleeved on the shift fork shaft (100) and can slide along the axial direction thereof, and the head (310) is fixedly connected to the sleeve (320).

5. A three-speed shift assembly as claimed in claim 1, characterized in that: A shift lever (400) is also provided on one side of the shift plate (200) for driving the shift plate (200) to rotate in a horizontal direction, so that the shift plate (200) is rotated by the shift lever (400) and the shift fork (300) is driven to slide along the axial direction of the shift fork shaft (100).

6. A three-speed shift assembly as claimed in claim 5, characterized in that: The shift plate (200) is provided with a straight slot (220) extending therethrough, and one end of the shift lever (400) is clamped in the straight slot (220).

7. A three-speed shift assembly as claimed in claim 6, characterized in that: The shift lever (400) is provided with a shift plate (500).

8. A three-speed shift assembly as claimed in claim 6, characterized in that: The shift lever (400) is provided with a shift block (600), and a plurality of shift slots (610) are formed on the shift block (600). A limiting member (700) for limiting the rotation of the shift block (600) is also provided on one side of the shift block (600), and one end of the limiting member (700) is elastically pressed in a shift slot (610).

9. A three-speed shift assembly as claimed in claim 8, characterized in that: The limiting member (700) is driven by a spring to move it closer to or farther from the shifting slot (610).

10. A rear gearbox, characterized in that: It comprises a three-speed shift assembly as described in any one of claims 1 to 9.

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