Rear fork and electric vehicle

Abstract

The utility model belongs to the technical field of electric vehicles, and particularly relates to a rear bottom fork and an electric vehicle, and the rear bottom fork comprises two bottom fork pipe groups which are symmetrically arranged, a transverse pipe group and two wheel connecting pieces. The bottom fork pipe group comprises a lower fork pipe and an upper fork pipe which are vertically arranged at an interval; the transverse pipe set comprises a first transverse pipe, and one end of the lower fork pipe and one end of the upper fork pipe are both connected to the first transverse pipe. The two wheel connecting pieces and the two bottom fork pipe sets are arranged in a one-to-one correspondence mode, the other end of the lower fork pipe and the other end of the upper fork pipe are connected to the wheel connecting pieces, and the wheel connecting pieces are used for being connected with wheels. The lower fork pipe and the upper fork pipe are connected to the first transverse pipe, so that connecting points on the rear fork structure are reduced, and the overall strength of the rear fork is improved. The electric vehicle adopts the rear fork, and the overall strength of the rear fork is improved, so that the bearing capacity of the electric vehicle is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of electric vehicles, in particular to a rear flat fork and an electric vehicle. Background Art

[0002] Electric bikes are a common means of transportation on the road. They can adapt to a variety of road conditions, have a fast riding speed and occupy a small area, so they are deeply loved by the general public. The rear fork is one of the important structures on the electric bike used to support the weight of the entire vehicle. It is used to connect the rear wheel and the electric bike frame and shock absorber and other components.

[0003] In the prior art, the rear fork is improved from a unilateral single-tube structure to a unilateral double-tube structure to increase the structural strength of the rear fork, thereby improving the overall load-bearing capacity of the electric vehicle frame. The double-tube structure includes an upper fork tube and a lower fork tube, and the current double-tube structure connection method has defects, because the upper fork tube is connected to the transverse connecting tube, the lower fork tube is connected to the connecting terminal, and then the upper fork tube and the lower fork tube are indirectly connected together through the transverse connecting tube and the front end of the connecting terminal; therefore, multiple connection points are generated during the connection process. The rear fork will be subjected to strong torsional force during the riding of the electric vehicle. When there are too many connection points, the overall strength of the rear fork will be reduced, thereby increasing the risk of fracture of the upper fork tube and the lower fork tube at the connection. Utility Model Content

[0004] The utility model aims to provide a rear flat fork and an electric vehicle, wherein the rear flat fork uses a transverse tube to connect an upper fork tube and a lower fork tube to one place, thereby reducing connection points and improving the overall strength of the rear flat fork.

[0005] To achieve this purpose, the utility model adopts the following technical solutions:

[0006] In one aspect, the utility model provides a rear flat fork, comprising:

[0007] Two symmetrically arranged flat fork tube groups, the flat fork tube groups comprising a lower fork tube and an upper fork tube spaced apart from each other;

[0008] A cross tube group, the cross tube group comprising a first cross tube, one end of the lower fork tube and one end of the upper fork tube are both connected to the first cross tube;

[0009] Two wheel connectors, the two wheel connectors are arranged in one-to-one correspondence with the two flat fork tube groups, the other ends of the lower fork tube and the upper fork tube of the flat fork tube group are simultaneously connected to the corresponding wheel connectors, and the wheel connectors are used to connect wheels.

[0010] Furthermore, the flat fork tube group also includes a longitudinal tube, one end of the longitudinal tube is connected to the lower fork tube, and the other end of the longitudinal tube is connected to the upper fork tube.

[0011] Furthermore, the flat fork tube group includes a plurality of longitudinal tubes, and the plurality of longitudinal tubes are arranged at intervals along the front-rear direction.

[0012] Furthermore, the cross tube group also includes a second cross tube, and the second cross tube is connected to the two lower fork tubes.

[0013] Further, the lower fork tube includes a first tube and a second tube, one end of the first tube is connected to the first cross tube, the other end of the first tube is connected to one end of the second tube at an angle, and the other end of the second tube is connected to the wheel connector;

[0014] Two ends of the second cross tube are respectively connected to the connection between the first tube member and the second tube member in the two lower fork tubes.

[0015] Furthermore, the cross tube group also includes a third cross tube, and the third cross tube is connected to the two upper fork tubes.

[0016] Further, the upper fork tube includes a third tube and a fourth tube, one end of the third tube is connected to the first cross tube, the other end of the third tube is connected to one end of the fourth tube at an angle, and the other end of the fourth tube is connected to the wheel connector;

[0017] Two ends of the third cross tube are respectively connected to the connection points of the third tube member and the fourth tube member in the two upper fork tubes.

[0018] Furthermore, the rear flat fork also includes a reinforcement member, which is respectively connected to the lower fork tube and the upper fork tube, and the reinforcement member is also connected to the wheel connecting member.

[0019] Furthermore, the rear flat fork also includes a shaft sleeve, which is passed through the first transverse tube and fixedly connected to the first transverse tube, and the shaft sleeve is used to pass through the middle shaft.

[0020] The rear flat fork of the utility model has at least the following beneficial effects:

[0021] The rear flat fork of the utility model comprises two symmetrically arranged flat fork tube groups, a cross tube group, and two wheel connecting members. The flat fork tube group comprises a lower fork tube and an upper fork tube arranged at intervals from top to bottom; the cross tube group comprises a first cross tube, and one end of the lower fork tube and the upper fork tube are both connected to the first cross tube; two wheel connecting members are arranged one by one corresponding to the two flat fork tube groups, and the other ends of the lower fork tube and the upper fork tube are connected to the wheel connecting member, and the wheel connecting member is used to connect the wheels. By connecting the lower fork tube and the upper fork tube to a first cross tube, the connection points on the rear flat fork structure are reduced, thereby improving the overall strength of the rear flat fork.

[0022] In another aspect, the utility model provides an electric vehicle, comprising:

[0023] The middle shaft and the wheel also include the rear flat fork described in any one of the above items, the middle shaft passes through the first cross tube, and the rotating shaft of the wheel is respectively connected to the two wheel connecting parts.

[0024] The electric vehicle of the utility model has at least the following beneficial effects:

[0025] The electric vehicle adopts the above-mentioned rear flat fork, and the overall strength of the rear flat fork is increased, thereby improving the carrying capacity of the electric vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the structure of the rear flat fork in the embodiment of the utility model;

[0027] Figure 2 This is a top view of the structure of the rear flat fork in the embodiment of the utility model;

[0028] Figure 3 This is a front view of the structure of the rear flat fork in the embodiment of the utility model;

[0029] Figure 4 It is a partial enlarged view of point A in the embodiment of the utility model;

[0030] Figure 5 It is a partial enlarged view of point B in the embodiment of the utility model.

[0031] In the figure:

[0032] 1. Flat fork tube group; 11. Lower fork tube; 111. First tube; 112. Second tube; 12. Upper fork tube; 121. Third tube; 122. Fourth tube; 13. Longitudinal tube; 2. Transverse tube group; 21. First transverse tube; 22. Second transverse tube; 23. Third transverse tube; 3. Wheel connector; 4. Reinforcement; 5. Bushing; 6. Shock absorber connector; 7. Mudguard mounting part; 8. Flat fork guard mounting part. DETAILED DESCRIPTION

[0033] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only the parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0034] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" 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 a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0035] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0036] In the description of this embodiment, the terms "upper", "lower", "right", etc., are based on the directions or positions shown in the drawings, and are only for the convenience of description and simplified operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0037] This embodiment provides a rear flat fork and an electric vehicle. The rear flat fork connects a lower fork tube and an upper fork tube to a transverse tube, reduces the connection points on the structure, and thus improves the use strength of the rear flat fork; the electric vehicle can also improve the overall strength of the electric vehicle after using the rear flat fork.

[0038] Please refer to Figures 1 to 3As shown, the rear flat fork includes two symmetrically arranged flat fork tube groups 1, a cross tube group 2, and two wheel connectors 3. The flat fork tube group 1 includes a lower fork tube 11 and an upper fork tube 12 arranged at intervals in the upper and lower parts; the cross tube group 2 includes a first cross tube 21, and one end of the lower fork tube 11 and the upper fork tube 12 are both connected to the first cross tube 21; the two wheel connectors 3 are arranged in a one-to-one correspondence with the two flat fork tube groups 1, and the other ends of the lower fork tube 11 and the upper fork tube 12 of the flat fork tube group 1 are simultaneously connected to the corresponding wheel connectors 3, and the wheel connectors 3 are used to connect the wheels. Specifically, in this embodiment, one end of the lower fork tube 11 and the upper fork tube 12 are both connected to the first cross tube 21, so that one end of the two symmetrically arranged flat fork tube groups 1 are both connected to the first cross tube 21, which can reduce the connection points between the flat fork tube group 1 and the first cross tube 21, and the connection method is relatively simple, which not only reduces the production cost, but also improves the overall strength of the rear flat fork. The bevel milling process is used on the connecting end surfaces of the lower fork tube 11 and the upper fork tube 12 and the first cross tube 21 to increase the contact area between the lower fork tube 11 and the upper fork tube 12 and the first cross tube 21, thereby improving the connection strength of the connecting point.

[0039] Alternatively, if Figure 1 As shown, the flat fork tube set 1 further includes a longitudinal tube 13, one end of the longitudinal tube 13 is connected to the lower fork tube 11, and the other end of the longitudinal tube 13 is connected to the upper fork tube 12. Specifically, in this embodiment, a longitudinal tube 13 is placed between the lower fork tube 11 and the upper fork tube 12 which are arranged at intervals, and the longitudinal tube 13 connects the lower fork tube 11 and the upper fork tube 12 together, and a triangle is formed between the longitudinal tube 13, the lower fork tube 11, and the upper fork tube 12, thereby improving the stability of the flat fork tube set 1, thereby improving the overall strength of the rear flat fork.

[0040] Furthermore, if Figure 1 and Figure 3 As shown, the flat fork tube set 1 includes a plurality of longitudinal tubes 13, and the plurality of longitudinal tubes 13 are arranged at intervals along the front-rear direction. Such an arrangement can further improve the stability of the flat fork tube set 1.

[0041] Alternatively, if Figure 1 and Figure 2 As shown, the cross tube group 2 also includes a second cross tube 22, and the second cross tube 22 is connected to the two lower fork tubes 11. The second cross tube 22 is located in the middle of the first cross tube 21 and the wheel connecting member 3, and then the second cross tube 22 connects the two lower fork tubes 11 together. The rear fork will be subjected to a large force during movement. In this way, the second cross tube 22 is supported in the middle of the two lower fork tubes 11 to prevent the two lower fork tubes 11 from being deformed. There can be multiple second cross tubes 22, and multiple second cross tubes 22 are connected to the two lower fork tubes 11.

[0042] Furthermore, if Figure 1As shown, the lower fork tube 11 includes a first tube 111 and a second tube 112. One end of the first tube 111 is connected to the first cross tube 21, and the other end of the first tube 111 is connected to one end of the second tube 112 at an angle. The other end of the second tube 112 is connected to the wheel connecting member 3; the two ends of the second cross tube 22 are respectively connected to the connection between the first tube 111 and the second tube 112 in the two lower fork tubes 11. Specifically, in this embodiment, the first tube 111 and the second tube 112 are connected at an angle, and the structure of the lower fork tube 11 is designed to be three-dimensionally twisted. One end of the three-dimensionally twisted lower fork tube 11 is connected to the first cross tube 21, and the other end is connected to the wheel connecting member 3. The three-dimensionally twisted lower fork tube 11 has a stronger bending strength, and can also reduce the stress concentration inside the lower fork tube 11, thereby improving the structural strength of the lower fork tube 11. The angled connection between the first pipe member 111 and the second pipe member 112 is a relatively weak location of the lower fork tube 11 structure, and the second cross tube 22 can be connected to the connection to improve the strength of the lower fork tube 11. In this embodiment, the first pipe member 111 and the second pipe member 112 are integrally provided. In other embodiments, the first pipe member 111 and the second pipe member 112 can also be two separate parts, and then connected together to form the lower fork tube 11.

[0043] Alternatively, if Figure 1 and Figure 2 As shown, the cross tube group 2 also includes a third cross tube 23, and the third cross tube 23 is connected to the two upper fork tubes 12. The third cross tube 23 is located in the middle of the first cross tube 21 and the wheel connecting member 3, and then the third cross tube 23 connects the two upper fork tubes 12 together. The rear fork will be subjected to a large force during movement. In this way, the third cross tube 23 is supported in the middle of the two upper fork tubes 12 to prevent the two upper fork tubes 12 from being deformed. There can be multiple third cross tubes 23, and multiple third cross tubes 23 are connected to the two upper fork tubes 12.

[0044] Furthermore, if Figure 1As shown, the upper fork tube 12 includes a third tube 121 and a fourth tube 122. One end of the third tube 121 is connected to the first transverse tube 21, and the other end of the third tube 121 is connected to one end of the fourth tube 122 at an angle. The other end of the fourth tube 122 is connected to the wheel connecting member 3. The two ends of the third transverse tube 23 are respectively connected to the connection between the third tube 121 and the fourth tube 122 in the two upper fork tubes 12. Specifically, in this embodiment, the third tube 121 and the fourth tube 122 are also connected at an angle, and the upper fork tube 12 is also designed to be a three-dimensional twisted structure. One end of the three-dimensionally twisted upper fork tube 12 is connected to the first transverse tube 21, and the other end is connected to the wheel connecting member 3. The three-dimensionally twisted structure improves the bending strength of the upper fork tube 12, and can also reduce the stress concentration inside the upper fork tube 12, thereby improving the structural strength of the upper fork tube 12. The angled connection between the third tube 121 and the fourth tube 122 is where the upper fork tube 12 has a relatively weak structure. The third cross tube 23 can be connected to the connection to improve the strength of the upper fork tube 12. In this embodiment, the third tube 121 and the fourth tube 122 are integrally formed. In other embodiments, the third tube 121 and the fourth tube 122 can also be two separate parts that are then connected together to form the upper fork tube 12.

[0045] like Figure 3 As shown, in this embodiment, the lower fork tube 11 and the upper fork tube 12 are arranged at an angle and are respectively connected to the first cross tube 21 and the wheel connector 3 to form a triangular structure. The triangular structure makes the flat fork tube group 1 more stable, thereby improving the overall strength of the rear flat fork.

[0046] like Figure 4 and Figure 5 As shown, in the present embodiment, a plurality of vertical tubes 13 are provided, wherein after one vertical tube 13 is connected with the first tube 111 and the third tube 121, a triangular structure is formed at the front of the flat fork tube group 1, and after another vertical tube 13 is connected with the second tube 112 and the fourth tube 122, a triangular structure is formed at the rear of the flat fork tube group 1. Both triangular structures can increase the stability of the flat fork tube group 1, thereby improving the local strength of the flat fork tube group 1, thereby improving the overall strength of the rear flat fork.

[0047] Alternatively, if Figure 1 and Figure 2As shown, the rear flat fork also includes a reinforcement 4, which is respectively connected to the lower fork tube 11 and the upper fork tube 12, and the reinforcement 4 is also connected to the wheel connection member 3. In this arrangement, a portion of the reinforcement 4 is connected to the lower fork tube 11 and the upper fork tube 12, and another portion of the reinforcement 4 is connected to the wheel connection member 3. Therefore, the connection between the flat fork tube group 1 and the wheel connection member 3 is further strengthened by the reinforcement 4. As one of the important force-bearing components of the electric vehicle, the rear flat fork will withstand relatively large torque during movement, and the arrangement of the reinforcement 4 can effectively enhance the structural strength between the flat fork tube group 1 and the wheel connection member 3, thereby improving the safety of the rear flat fork.

[0048] Alternatively, if Figure 3 As shown, the rear fork further includes a sleeve 5, which is inserted into the first transverse tube 21 and fixedly connected to the first transverse tube 21, and the sleeve 5 is used to insert the middle shaft. Specifically, in this embodiment, two sleeves 5 are inserted into the first transverse tube 21, and the two sleeves 5 are fixedly connected to the first transverse tube 21 to prevent the sleeves 5 from moving, and then the middle shaft passes through the two sleeves 5 to avoid friction between the middle shaft and the first transverse tube 21.

[0049] This embodiment also provides an electric vehicle, including a middle shaft, wheels, and the above-mentioned rear flat fork, wherein the middle shaft is passed through the first transverse tube 21, and the rotating shafts of the wheels are respectively connected to two wheel connecting members 3. After the electric vehicle uses the rear flat fork, the overall structural strength of the electric vehicle can be improved, and the service life of the electric vehicle can be increased.

[0050] In this embodiment, if Figures 1 to 3 As shown, the rear fork also includes a shock absorber connector 6, a mudguard mounting member 7, and a fork guard mounting member 8. The shock absorber connector 6 is selectively connected to the second transverse tube 22 and the third transverse tube 23, that is, the shock absorber connector 6 can be selectively connected to the second transverse tube 22 or the third transverse tube 23. The shock absorber connector 6 is used to connect the shock absorber, and the other end of the shock absorber is connected to the electric vehicle frame. The shock absorber is used to reduce vibration when riding the electric vehicle to improve the comfort of the electric vehicle. In this embodiment, there are two mudguard mounting members 7, and the two mudguard mounting members 7 are symmetrically and spaced apart on the upper fork tube 12. The mudguard mounting member 7 is used to install the mudguard. The two mudguard mounting members 7 make the mudguard installation more secure, and the mudguard prevents mud from splashing onto the rider. In this embodiment, there are four fork guard plate mounting parts 8, which are symmetrically arranged on the lower fork tube 11 and the wheel connecting part 3 in pairs and at intervals. The safety guard plate mounting parts are used to install the fork guard plate, which can protect the rear fork and the wheel and prevent other objects from colliding with the rear fork and the wheel during riding. It should be noted that the shock absorber connecting part 6 can be not only one, but also more as needed; the fender mounting parts 7 are not limited to two, but can also be an even number of more than two; the fork guard plate mounting parts 8 are also not limited to four, but can also be an even number of more than four.

[0051] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the scope of protection of the present invention. It is not necessary and impossible to list all implementation methods here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the scope of protection of the claims of the present invention.

Claims

1. A rear flat fork, characterized in that: include: Two symmetrically arranged flat fork tube groups (1), the flat fork tube groups (1) comprising a lower fork tube (11) and an upper fork tube (12) spaced apart from each other; A transverse tube group (2), the transverse tube group (2) comprising a first transverse tube (21), one end of the lower fork tube (11) and one end of the upper fork tube (12) being connected to the first transverse tube (21); Two wheel connectors (3), the two wheel connectors (3) are arranged in one-to-one correspondence with the two flat fork tube groups (1), the other ends of the lower fork tube (11) and the upper fork tube (12) of the flat fork tube group (1) are simultaneously connected to the corresponding wheel connectors (3), and the wheel connectors (3) are used to connect wheels.

2. A rear flat fork according to claim 1, characterized in that: The flat fork tube group (1) also includes a longitudinal tube (13), one end of the longitudinal tube (13) is connected to the lower fork tube (11), and the other end of the longitudinal tube (13) is connected to the upper fork tube (12).

3. A rear flat fork according to claim 2, characterized in that: The flat fork tube group (1) comprises a plurality of longitudinal tubes (13), and the plurality of longitudinal tubes (13) are arranged at intervals along the front-rear direction.

4. A rear flat fork according to claim 1, characterized in that: The cross tube group (2) also includes a second cross tube (22), wherein the second cross tube (22) is connected to the two lower fork tubes (11).

5. A rear flat fork according to claim 4, characterized in that: The lower fork tube (11) comprises a first tube (111) and a second tube (112), one end of the first tube (111) is connected to the first transverse tube (21), the other end of the first tube (111) is connected to one end of the second tube (112) at an angle, and the other end of the second tube (112) is connected to the wheel connecting member (3); Both ends of the second transverse tube (22) are respectively connected to the connection points of the first tube member (111) and the second tube member (112) in the two lower fork tubes (11).

6. A rear flat fork according to claim 1, characterized in that: The cross tube group (2) also includes a third cross tube (23), and the third cross tube (23) is connected to the two upper fork tubes (12).

7. A rear flat fork according to claim 6, characterized in that: The upper fork tube (12) comprises a third tube (121) and a fourth tube (122), one end of the third tube (121) is connected to the first transverse tube (21), the other end of the third tube (121) is connected to one end of the fourth tube (122) at an angle, and the other end of the fourth tube (122) is connected to the wheel connecting member (3); Both ends of the third transverse tube (23) are respectively connected to the connection points of the third tube member (121) and the fourth tube member (122) in the two upper fork tubes (12).

8. The rear flat fork according to claim 1, characterized in that: The rear flat fork also includes a reinforcement member (4), the reinforcement member (4) is respectively connected to the lower fork tube (11) and the upper fork tube (12), and the reinforcement member (4) is also connected to the wheel connecting member (3).

9. A rear flat fork according to any one of claims 1 to 8, characterized in that: The rear flat fork further comprises a shaft sleeve (5), the shaft sleeve (5) being passed through the first transverse tube (21) and being fixedly connected to the first transverse tube (21), the shaft sleeve (5) being used for passing through the middle shaft.

10. An electric vehicle, comprising a central axle and wheels, characterized in that: It also comprises the rear flat fork as claimed in any one of claims 1 to 9, wherein the middle axis passes through the first transverse tube (21), and the rotating shafts of the wheels are respectively connected to the two wheel connecting members (3).

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