Three-gear shifting mechanism and rear gearbox

Abstract

The utility model provides a three-gear shifting mechanism which comprises a shifting rod used for driving a shifting fork shaft to move in the axial direction of the shifting rod, a shifting piece arranged on the shifting rod and a shifting assembly, and the shifting assembly comprises a shifting block arranged on the shifting rod and provided with a plurality of gear grooves; and the limiting piece is arranged on one side of the gear shifting block, one end of the limiting piece is elastically pressed in a gear groove, so that rotation of the gear shifting rod is limited through the limiting piece, and axial movement of the shifting fork shaft is limited. According to the three-gear gear shifting mechanism, the gear shifting block and the limiting piece are arranged on the gear shifting rod, and one end of the gear shifting rod is elastically pressed in the gear groove of the gear shifting block under the action of the limiting piece, so that the shifting fork shaft is driven to play an effective locking role on the shifting fork by limiting rotation of the gear shifting rod; and the phenomena of gear skipping and gear disorder in the gear shifting process are prevented, and meanwhile, normal gear shifting operation is not influenced, so that the electric vehicle is more convenient, labor-saving and rapid, and the running stability of the electric vehicle is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of three-speed shifting mechanisms, in particular to a three-speed shifting mechanism and a rear-mounted gearbox. Background Art

[0002] At present, electric three-wheeled or four-wheeled motorcycles are increasingly used, and their load capacity is also getting larger and larger. When driving on a flat road, the driving needs can be met by changing the speed through the gearbox. At the same time, in order to provide sufficient power output transmission to meet the different usage conditions of electric three-wheeled or four-wheeled motorcycles such as no-load, load, full load or climbing, the gearbox is mostly a three-speed or four-speed gear mechanism to improve its practicality.

[0003] The three-speed shift mechanism of existing electric three-wheeled or four-wheeled motorcycles mostly adopts a structure of steel balls and compression springs, that is, a plurality of grooves matching the steel balls are provided on the shift fork shaft; when the gear is shifted, the shift fork moves driven by the shift fork shaft, and the steel ball will withdraw from one of the grooves, enter another groove after the gear is shifted, and lock the shift fork under the action of the compression spring to achieve the gear shift. However, in this process, since the steel ball rolls and slides, although it is easy for the steel ball to withdraw from the groove, the locking reliability is poor. After a long period of use, the groove is easily damaged and deformed, resulting in gear skipping, thereby causing safety accidents. Utility Model Content

[0004] In view of the deficiencies in the prior art, the utility model provides a three-speed shift mechanism and a rear-mounted gearbox to solve the technical problem that in the related technology, the three-speed shift mechanism using steel balls and compression springs has poor locking reliability, and after long-term use, the grooves are easily stretched and deformed, resulting in gear skipping, thereby causing safety accidents.

[0005] The utility model provides a three-speed shift mechanism, comprising a shift rod for driving a shift fork shaft to move along its axial direction, a shift plate arranged on the shift rod, and a shift assembly, wherein the shift assembly comprises:

[0006] A shift block is provided on the shift lever and is formed with a plurality of shift slots;

[0007] The limiting member is arranged on one side of the shift block, and one end of the limiting member is elastically pressed in a shift groove, so as to limit the rotation of the shift rod through the limiting member and limit the axial movement of the shift fork shaft.

[0008] Furthermore, a mounting hole is formed at one end of the position-limiting member which is away from the shift block, an elastic member is installed in the mounting hole, and one end of the elastic member abuts against the bottom of the mounting hole.

[0009] Furthermore, one end of the elastic member facing away from the limiting member abuts against a locking bolt, and the locking bolt is connected to the housing by means of a thread.

[0010] Furthermore, a supporting hole is formed at one end of the locking bolt facing the limiting member, and one end of the elastic member is supported on the bottom of the supporting hole.

[0011] Furthermore, the elastic member is a compression spring.

[0012] Furthermore, one end of the limiting member has a limiting protrusion for abutting against a shifting groove.

[0013] Furthermore, the two opposite side walls of the shifting groove and the two opposite side walls of the limiting convex head are both inclined structures and match each other, and the groove bottom of the shifting groove and the convex head at the contact end of the limiting convex head with its groove bottom are both arc structures and match each other.

[0014] Furthermore, the side wall of the shift block has rounded corners at the notch corners of the shift slot.

[0015] Furthermore, the shift block is formed with three shift slots, and the angles corresponding to each shift slot are the same.

[0016] The utility model also provides a rear-mounted gearbox, comprising the above-mentioned three-speed shifting mechanism.

[0017] Compared with the prior art, the utility model has the following beneficial effects:

[0018] The three-speed shift mechanism of the utility model is provided with a shift block and a limit member on the shift lever. Under the action of the limit member, one end of the shift block is elastically pressed in the shift groove of the shift block, thereby limiting the rotation of the shift lever and driving the shift fork shaft to effectively lock the shift fork, preventing the occurrence of gear skipping and disordered gears during the gear shifting process, and at the same time will not affect the normal gear shifting operation, so that it is more convenient, labor-saving and rapid, and the driving stability of the electric vehicle is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic structural diagram of a three-speed shift mechanism according to an embodiment of the present utility model;

[0020] Figure 2 This is a schematic diagram of the top view of the structure of the third gear shift mechanism of an embodiment of the utility model;

[0021] Figure 3 This is a schematic diagram of the structure of a shift block in a three-speed shift mechanism according to an embodiment of the present utility model;

[0022] Figure 4 The structure of the limiter in the three-speed shift mechanism of the utility model is shown in FIG. Figure 1 ;

[0023] Figure 5The structure of the limiter in the three-speed shift mechanism of the utility model is shown in FIG. Figure 2 ;

[0024] Figure 6 It is a top view of a locking bolt in a three-speed shift mechanism according to an embodiment of the present utility model;

[0025] Description of Figure Numbers:

[0026] 110. Shift lever; 120. Shift plate;

[0027] 210, shift block; 211, gear slot;

[0028] 220, limiting member; 221, mounting hole; 222, limiting protrusion;

[0029] 230, elastic member;

[0030] 240, locking bolt; 241, abutment hole.

[0031] 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

[0032] 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.

[0033] 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 should still fall within the scope of the technical content disclosed by the utility model without affecting the effect that the utility model can produce and the purpose that can be achieved. 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 should also be regarded as the scope of the implementation of the utility model without substantial change of the technical content.

[0034] like Figure 1-3As shown, an embodiment of the utility model provides a three-speed shift mechanism, including a shift rod 110 for driving the shift fork shaft to move axially thereof, a shift plate 120 provided on the shift rod 110, and a shift assembly, wherein the shift assembly includes a shift block 210 and a limit member 220, wherein the shift block 210 is provided on the shift rod 110 and is located below the shift plate 120, and the shift block 210 is formed with a plurality of shift grooves 211; the limit member 220 is provided on one side of the shift block 210, and one end is elastically pressed in a shift groove 211, so as to limit the rotation of the shift rod 110 through the limit member 220, and limit the axial movement of the shift fork shaft.

[0035] In the embodiment of the utility model, a shift block 210 and a limit member 220 are provided on the shift lever 110. Under the action of the limit member 220, one end of the shift block 210 is elastically pressed in the shift slot 211 of the shift block 210. Thus, by limiting the rotation of the shift lever 110, the shift fork shaft is driven to effectively lock the shift fork, thereby preventing the occurrence of gear skipping and gear chaos during the gear shifting process, and at the same time will not affect the normal gear shifting operation, thereby being more convenient, labor-saving, and rapid, and improving the driving stability of the electric vehicle.

[0036] like Figure 2 As shown, in the embodiment of the utility model, a mounting hole 221 is provided at one end of the limit member 220 away from the shift block 210, and an elastic member 230 is installed in the mounting hole 221, and one end of the elastic member 230 abuts against the bottom of the mounting hole 221. The limit member 220 is moved close to or away from the shift block 210 through the elastic member 230, and then the limit member 220 can be abutted against a gear slot 211 according to the needs of gear shifting, giving the shift block 210 a certain clamping force limit, thereby preventing the shift lever 110 from rotating at will and ensuring the accurate position of the gear slot 211, wherein the elastic member 230 is a compression spring.

[0037] like Figure 6 As shown, in the embodiment of the utility model, the end of the elastic member 230 facing away from the limit member 220 is abutted against a locking bolt 240, and the locking bolt 240 is connected to the shell by a threaded manner. The locking bolt 240 is used to facilitate the installation and disassembly of the limit member 220 and the elastic member 230. At the same time, in order to reduce the space occupied by the elastic member 230, the locking bolt 240 is provided with an abutment hole 241 at one end facing the limit member 220, and one end of the elastic member 230 abuts against the bottom of the abutment hole 241, so that part of the length of the elastic member 230 coincides with the length of the locking bolt 240, thereby reducing the setting of the axial space and making its structure more compact.

[0038] like Figure 3As shown, in the embodiment of the utility model, one end of the limiting member 220 has a limiting protrusion 222 for abutting against a gear groove 211; the opposite side walls of the gear groove 211 and the opposite side walls of the limiting protrusion 222 are both inclined structures and match each other, the groove bottom of the gear groove 211 and the protrusion of the limiting protrusion 222 at the contact end with its groove bottom are both arc structures and match each other, and the inclined surface structure and the arc structure make it easy for the limiting protrusion 222 to slide into or out of the gear groove 211, thereby making gear shifting more convenient, labor-saving and rapid; specifically, under the elastic force of the elastic member 230, the limiting protrusion 222 is completely fitted with the gear groove 211, that is, the groove bottom of the gear groove 211 and the arc surface of the protrusion are fitted, and the inclined surface of the gear groove 211 is fitted with the inclined surface of the limiting protrusion 222.

[0039] like Figure 2-3 As shown, in the embodiment of the utility model, the side wall of the shift block 210 has rounded corners at the notch corners of the shift slot 211. The rounded corners can increase the thickness at the corners and thus increase the strength at the corners, making them less susceptible to damage. At the same time, it is convenient for the limiting protrusion to slide into or out of the shift slot 211, thereby facilitating shifting.

[0040] like Figure 2-3 As shown, in the embodiment of the utility model, the shift block 210 is formed with three gear slots 211, and each gear slot 211 corresponds to the same angle. Specifically, in the present embodiment, the three gear slots 211 correspond to the three gears of normal, power and acceleration, respectively, and each gear slot 211 corresponds to 35 degrees, so that the angle of each gear shift is the same, which is convenient for the gear shift operation; when shifting gears, under the action of manual or automatic external force, the shift block will rotate with the rotation of the shift plate 120 under the action of the shift lever 110, and the shift block will slide relative to the limit member 220, so that the limit member 220 can slide into the previous or next gear slot 211 for shifting gears, and at the same time, it can also prevent the shift plate 120 from changing gear when it is accidentally hit by external force.

[0041] The utility model also provides a rear gearbox, including the above-mentioned three-speed shift mechanism. Since all the technical solutions of the above-mentioned embodiments are adopted in this embodiment, it at least has all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, and thus will not be described one by one here.

[0042] 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 mechanism, characterized in that: The invention comprises a shift rod (110) for driving a shift fork shaft to move along its axial direction, a shift plate (120) arranged on the shift rod (110), and a shift assembly, wherein the shift assembly comprises: A shift block (210) is arranged on the shift lever (110) and is formed with a plurality of shift slots (211); The limiting member (220) is arranged on one side of the shift block (210), and one end of the limiting member is elastically pressed in a shift slot (211), so as to limit the rotation of the shift rod (110) and limit the axial movement of the shift fork shaft through the limiting member (220).

2. A three-speed shift mechanism as claimed in claim 1, characterized in that: An installation hole (221) is provided at one end of the limiting member (220) that is away from the shift block (210), an elastic member (230) is installed in the installation hole (221), and one end of the elastic member (230) abuts against the bottom of the installation hole (221).

3. A three-speed shift mechanism as claimed in claim 2, characterized in that: One end of the elastic member (230) that is away from the limiting member (220) abuts against a locking bolt (240), and the locking bolt (240) is connected to the housing in a threaded manner.

4. A three-speed shift mechanism as claimed in claim 3, characterized in that: An abutment hole (241) is formed at one end of the locking bolt (240) facing the limiting member (220), and one end of the elastic member (230) abuts against the bottom of the abutment hole (241).

5. A three-speed shift mechanism as claimed in claim 4, characterized in that: The elastic member (230) is a compression spring.

6. A three-speed shift mechanism as claimed in claim 1, characterized in that: One end of the limiting member (220) has a limiting protrusion (222) for abutting against a shifting groove (211).

7. A three-speed shift mechanism as claimed in claim 6, characterized in that: The opposing side walls of the shifting groove (211) and the opposing side walls of the limiting convex head (222) are both inclined surface structures and match each other, and the groove bottom of the shifting groove (211) and the convex head at the contact end of the limiting convex head (222) and its groove bottom are both arc structures and match each other.

8. A three-speed shift mechanism as claimed in claim 1, characterized in that: The side wall of the shift block (210) has rounded corners at the notch edges of the shift slot (211).

9. A three-speed shift mechanism as claimed in claim 1, characterized in that: The shift block (210) is formed with three shift slots (211), and the angles corresponding to each shift slot (211) are the same.

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

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