Rear axle structure of electric tricycle

Abstract

The invention relates to the field of electro-tricycles, in particular to a rear axle structure of an electro-tricycle. The rear axle structure comprises a rear frame, a supporting arm mechanism, a motor, a transmission box body, a box body damping mechanism, a multi-wheel-track matching type transmission shaft, an axle tube mechanism, a damping mechanism and wheels. A supporting arm rotating shaft is arranged at the front end of the rear frame, the supporting arm mechanism comprises two supporting arms which are symmetrically arranged, the front ends of the supporting arms are hinged to the rear frame through the supporting arm rotating shaft, and the damping mechanism is arranged between the rear frame and the supporting arm mechanism; the transmission box body is installed below the rear frame through the box body damping mechanism, and the axle tube mechanism is fixed to the middle rear end of the supporting arm.

Description

Technical Field

[0001] This invention relates to the field of electric tricycles, and more specifically to a rear axle structure for an electric tricycle. Background Technology

[0002] Traditional electric tricycles use a conventional integrated rear axle, such as the one disclosed in patent CN2022220743952. This structure has the following main disadvantages: 1. It is bumpy when encountering obstacles, resulting in a poor riding experience and poor safety when turning; 2. It is often equipped with a leaf spring non-independent suspension, which causes interference between the left and right wheels. Bumps on one side are directly transmitted to the other side, resulting in poor comfort and increased structural fatigue; 3. It has poor platform adaptability, as the rear axle, as a whole component, can only be matched with corresponding fixed wheelbase models. Summary of the Invention

[0003] The purpose of this invention is to solve the problems in the background art and provide a rear axle structure for an electric tricycle.

[0004] The above-mentioned technical objective of the present invention is achieved through the following technical solution: A rear axle structure for an electric tricycle, characterized in that it comprises: a rear frame, a support arm mechanism, a motor, a transmission housing, a housing shock absorption mechanism, a multi-track matching transmission shaft, an axle tube mechanism, a shock absorption mechanism, and wheels; A support arm pivot is provided at the front end of the rear frame. The support arm mechanism includes two symmetrically arranged support arms. The front end of the support arm is hinged to the rear frame through the support arm pivot. The shock absorption mechanism is located between the rear frame and the support arm mechanism. The transmission housing is installed under the rear frame via the housing shock absorption mechanism, and the bridge tube mechanism is fixed at the middle and rear ends of the support arm; The multi-track matching driveshaft includes: two double-decimal driveshafts respectively disposed on both sides of the transmission housing; each double-decimal driveshaft includes: an upper decimal shaft group and a lower decimal shaft group; the upper decimal shaft group includes: a gearbox insert shaft, a splined half-shaft insert rod, and an upper cross shaft, the gearbox insert shaft being connected to the transmission housing; the lower decimal shaft group includes: a bridge tube insert shaft, the splined half-shaft insert sleeve, and a lower cross shaft, the bridge tube insert shaft being connected to the bridge tube mechanism; the upper decimal shaft group and the lower decimal shaft group are connected by a sliding transmission connection through the splined half-shaft insert rod and the splined half-shaft insert sleeve, the sliding transmission connection being used to adjust the track width to adapt to different track width requirements.

[0005] Preferably, the transmission housing is provided with a lifting lug connected to the housing lifting component; the housing lifting component includes: a shock-absorbing base plate and a suspension plate, the top of the suspension plate is welded to the middle of the shock-absorbing base plate, and the bottom of the suspension plate is provided with a connecting lug; the lifting lug and the connecting lug are connected by bolts; the shock absorber is installed between the shock-absorbing base plate and the rear frame suspension beam of the tricycle.

[0006] Preferably, the transmission housing includes: a transmission housing shell, a differential bearing, a drive shaft bearing, a transmission gear set, and a differential assembly; the differential assembly has tapered sides and is rotatably mounted inside the transmission housing shell via the differential bearing.

[0007] Preferably, the differential assembly includes: a differential gearbox, an external transmission gear, a bevel gear shaft, a half-shaft bevel gear, and a planetary bevel gear. The external transmission gear is fixed to the outside of the differential gearbox, the bevel gear shaft passes through the interior of the external transmission gear, the planetary bevel gear is mounted on the bevel gear shaft, and the half-shaft bevel gear is disposed on both sides of the bevel gear shaft and meshes with the planetary bevel gear.

[0008] Preferably, the gearbox insert shaft includes a fork portion and a spline portion. The half-shaft bevel gear has a keyway that matches the spline portion. The half-shaft bevel gear has a retaining ring chamfer. The inner end of the gearbox insert shaft is inserted into the half-shaft bevel gear at a corresponding position where a retaining ring groove is provided. The inner end of the gearbox insert shaft is positioned by the retaining ring. The outer end of the gearbox insert shaft has a bearing retainer. The outer end of the gearbox insert shaft is positioned by a transmission shaft bearing and the bearing retainer.

[0009] Preferably, the bridge tube mechanism includes: a bridge tube, a bridge tube connector, and a brake connection flange.

[0010] Preferably, the brake connection flange includes: a flange body, a bridge pipe insertion hole, a flange mounting hole, and a brake mounting hole; the bridge pipe connection seat includes: a flange positioning hole and a bridge pipe positioning insertion hole, and the brake connection flange and the bridge pipe connection seat are installed and fixed through the flange mounting hole, the flange positioning hole, and connecting bolts.

[0011] Preferably, the outer ring of the bridge tube is provided with a flange connection part, the inner side of the bridge tube is provided with a shaft insertion part, the flange connection part is welded to the bridge tube insertion hole, and a fixing plate mounting platform is provided at the welding bevel of the flange connection part facing the bridge tube connection seat position, and the bridge tube is installed in the bridge tube positioning insertion hole through the fixing plate mounting platform.

[0012] Preferably, the two ends of the insert shaft are provided with bearing holders, and the bearing holders are provided with bearings. The outer bearing is provided with a retaining ring groove, and a retaining ring is provided in the retaining ring groove.

[0013] Preferably, the damping mechanism includes: a first damper and a second damper.

[0014] In summary, the beneficial effects of this invention are as follows: 1. The rear axle structure of the electric tricycle described in this invention achieves independent suspension of the left and right wheels through a support arm mechanism, which greatly improves riding comfort and shock absorption adaptability to different terrains.

[0015] 2. The rear axle structure of the electric tricycle described in this invention adopts a platform design. ① With the multi-track matching drive shaft, it can be adapted to a variety of different track models, with strong versatility; ② Through the special axle tube mechanism design, it can be adapted to both disc brake and drum brake models, and can be flexibly matched and replaced.

[0016] 3. The rear axle structure of the electric tricycle described in this invention effectively prevents the vibration of the motor and transmission housing from being transmitted to the vehicle body through the housing shock absorption mechanism, thereby improving comfort. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram of the box-type shock absorption mechanism in this invention; Figure 3 This is a schematic diagram of the multi-track matching drive shaft in this invention; Figure 4 This is a schematic diagram of the transmission housing in this invention; Figure 5 This is a schematic diagram of the bridge tube mechanism in this invention; Figure 6 This is a cross-sectional schematic diagram of the bridge tube mechanism in this invention. Detailed Implementation

[0018] The following specific embodiments are merely illustrative of the present invention and are not intended to limit the invention. After reading this specification, those skilled in the art can make modifications to these embodiments without contributing any inventive step, but such modifications are protected by patent law as long as they fall within the scope of the claims of the present invention.

[0019] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0020] Example

[0021] according to Figures 1-6As shown, a rear axle structure for an electric tricycle is characterized by comprising: a rear frame 1, a support arm mechanism 2, a motor, a transmission housing 3, a housing shock absorption mechanism 4, a multi-track matching transmission shaft 5, an axle tube mechanism 6, a shock absorption mechanism 7, and wheels 8; a support arm pivot 11 is provided at the front end of the rear frame 1, the support arm mechanism 2 includes two symmetrically arranged support arms 21, the front ends of the support arms 21 are hinged to the rear frame 1 through the support arm pivot 11, and the shock absorption mechanism 7 is disposed between the rear frame 1 and the support arm mechanism 2; the transmission housing 3 is installed below the rear frame 1 through the housing shock absorption mechanism 4, and the axle tube mechanism 6 is fixed at the middle and rear ends of the support arms 21; according to Figure 3 As shown, the multi-track matching drive shaft 5 includes: two double-decimal drive shafts 51 respectively disposed on both sides of the transmission housing 3; each double-decimal drive shaft 51 includes: an upper decimal shaft assembly 511 and a lower decimal shaft assembly 512; the upper decimal shaft assembly 511 includes: a gearbox insert shaft 5112, a splined half-shaft insert rod 5111, and an upper cross shaft 5113, the gearbox insert shaft 5112 being connected to the transmission housing 3; the lower decimal shaft assembly 512 includes: a bridge tube insert shaft 5122, a splined half-shaft sleeve 5121, and a lower cross shaft 5123, the bridge tube insert shaft 5122 being connected to the bridge tube mechanism 6; the upper decimal shaft assembly 511 and the lower decimal shaft assembly 512 are connected by a sliding transmission connection through the splined half-shaft insert rod 5111 and the splined half-shaft sleeve 5121. The damping mechanism 7 includes: a first damper 71 and a second damper 72.

[0022] according to Figure 2 As shown, the transmission housing 3 is provided with a lifting lug 301 connected to the housing lifting component 41; the housing lifting component 41 includes: a shock-absorbing base plate 411 and a suspension plate 412, the top of the suspension plate 412 is welded to the middle of the shock-absorbing base plate 411, and the bottom of the suspension plate 412 is provided with a connecting lug 4121; the lifting lug 301 and the connecting lug 4121 are connected by bolts; the shock absorber 42 is installed between the shock-absorbing base plate 411 and the rear frame suspension beam 1 of the tricycle.

[0023] according to Figure 4 As shown, the transmission housing 3 includes: a transmission housing shell 31, a differential bearing 32, a drive shaft bearing 33, a transmission gear set 34, and a differential assembly 9; the differential assembly 9 has tapered sides and is rotatably mounted in the transmission housing shell 31 via the differential bearing 32.

[0024] The differential assembly 9 includes: a differential gearbox 91, an external transmission gear 92, a bevel gear shaft 93, a half-shaft bevel gear 94, and a planetary bevel gear 95. The external transmission gear 92 is fixed on the outside of the differential gearbox 91. The bevel gear shaft 93 passes through the interior of the external transmission gear 92. The planetary bevel gear 95 is mounted on the bevel gear shaft 93. The half-shaft bevel gear 94 is located on both sides of the bevel gear shaft 93 and meshes with the planetary bevel gear 95.

[0025] The gearbox insert shaft 5112 includes a fork portion and a spline portion. The half-shaft bevel gear 94 is provided with a keyway that matches the spline portion. The half-shaft bevel gear 94 is provided with a retaining ring chamfer. The inner end of the gearbox insert shaft 5112 is inserted into the half-shaft bevel gear 94 at the corresponding position where a retaining ring groove is provided. The inner end of the gearbox insert shaft 5112 is positioned by a retaining ring 96. The outer end of the gearbox insert shaft 5112 is provided with a bearing retainer. The outer end of the gearbox insert shaft 5112 is positioned with the bearing retainer by a transmission shaft bearing 33.

[0026] according to Figure 5 , Figure 6 As shown, the bridge tube mechanism 6 includes: a bridge tube 61, a bridge tube connecting seat 62, and a brake connecting flange 63. The brake connecting flange 63 includes: a flange body 631, a bridge tube insertion hole 632, a flange mounting hole 633, and a brake mounting hole 634. The bridge tube connecting seat 62 includes: a flange positioning hole 621 and a bridge tube positioning insertion hole 622. The brake connecting flange 63 and the bridge tube connecting seat 62 are installed and fixed through the flange mounting hole 633, the flange positioning hole 621, and connecting bolts. The outer ring of the bridge tube 61 has a flange connection portion 611, and the inner side of the bridge tube 61 has an insertion shaft portion 612. The flange connection portion 611 is welded to the bridge tube insertion hole 632. A fixing plate mounting platform 613 is provided at the weld bevel of the flange connection portion 611 facing the bridge tube connecting seat 62. The bridge tube 61 is installed in the bridge tube positioning insertion hole 622 through the fixing plate mounting platform 613. The shaft insert 612 has bearing mounting bases 6121 at both ends, and bearings are installed at the bearing mounting bases 6121. The outer bearing also has a retaining ring groove 6122 on the outside, and a retaining ring is installed in the retaining ring groove 6122.

Claims

1. A rear axle structure for an electric tricycle, characterized in that, include: Rear frame (1), support arm mechanism (2), motor, transmission housing (3), housing shock absorption mechanism (4), multi-track matching drive shaft (5), axle tube mechanism (6), shock absorption mechanism (7) and wheels (8); The rear frame (1) is provided with a support arm pivot (11) at the front end. The support arm mechanism (2) includes two symmetrically arranged support arms (21). The front end of the support arm (21) is hinged to the rear frame (1) through the support arm pivot (11). The shock absorption mechanism (7) is located between the rear frame (1) and the support arm mechanism (2). The transmission housing (3) is installed below the rear frame (1) through the housing shock absorption mechanism (4), and the bridge tube mechanism (6) is fixed at the middle and rear end of the support arm (21); The multi-track matching drive shaft (5) includes: two double-decimal drive shafts (51) respectively disposed on both sides of the transmission housing (3); each double-decimal drive shaft (51) includes: an upper delimiter shaft group (511) and a lower delimiter shaft group (512); the upper delimiter shaft group (511) includes: a gearbox insert shaft (5112), a spline half-shaft insert rod (5111), and an upper cross shaft (5113), the gearbox insert shaft (5112) The lower cross shaft group (512) is connected to the transmission housing (3); the lower cross shaft group (512) includes: bridge tube insert shaft (5122), spline half shaft sleeve (5121) and lower cross shaft (5123), the bridge tube insert shaft (5122) is connected to the bridge tube mechanism (6); the upper cross shaft group (511) and the lower cross shaft group (512) are connected by a sliding transmission through spline half shaft insert rod (5111) and spline half shaft sleeve (5121).

2. The rear axle structure of an electric tricycle according to claim 1, characterized in that, The transmission housing (3) is provided with a lifting lug (301) connected to the housing lifting component (41); the housing lifting component (41) includes: a shock-absorbing base plate (411) and a suspension plate (412), the top of the suspension plate (412) is welded to the middle of the shock-absorbing base plate (411), and the bottom of the suspension plate (412) is provided with a connecting lug (4121); the lifting lug (301) and the connecting lug (4121) are connected by bolts; the shock absorber (42) is installed between the shock-absorbing base plate (411) and the rear frame suspension beam (1) of the tricycle.

3. The rear axle structure of an electric tricycle according to claim 1, characterized in that, The transmission housing (3) includes: transmission housing shell (31), differential bearing (32), transmission shaft bearing (33), transmission gear set (34) and differential assembly (9); the differential assembly (9) has tapered sides and is rotatably mounted in the transmission housing shell (31) through the differential bearing (32).

4. The rear axle structure of an electric tricycle according to claim 3, characterized in that, The differential assembly (9) includes: a differential gearbox (91), an external transmission gear (92), a bevel gear shaft (93), a half-shaft bevel gear (94), and a planetary bevel gear (95). The external transmission gear (92) is fixed to the outside of the differential gearbox (91). The bevel gear shaft (93) passes through the interior of the external transmission gear (92). The planetary bevel gear (95) is mounted on the bevel gear shaft (93). The half-shaft bevel gear (94) is located on both sides of the bevel gear shaft (93) and meshes with the planetary bevel gear (95).

5. The rear axle structure of an electric tricycle according to claim 4, characterized in that, The gearbox insert shaft (5112) includes a fork portion and a spline portion. The half-shaft bevel gear (94) is provided with a keyway that matches the spline portion. The half-shaft bevel gear (94) is provided with a retaining ring chamfer. The inner end of the gearbox insert shaft (5112) is inserted into the half-shaft bevel gear (94) at the corresponding position where a retaining ring groove is provided. The inner end of the gearbox insert shaft (5112) is positioned by a retaining ring (96). The outer end of the gearbox insert shaft (5112) is provided with a bearing retainer. The outer end of the gearbox insert shaft (5112) is positioned by a transmission shaft bearing (33) and the bearing retainer.

6. The rear axle structure of an electric tricycle according to claim 1, characterized in that, The bridge tube mechanism (6) includes: bridge tube (61), bridge tube connector (62) and brake connector flange (63).

7. The rear axle structure of an electric tricycle according to claim 6, characterized in that, The brake connection flange (63) includes: a flange body (631), a bridge pipe insertion hole (632), a flange mounting hole (633), and a brake mounting hole (634); the bridge pipe connection seat (62) includes: a flange positioning hole (621) and a bridge pipe positioning insertion hole (622). The brake connection flange (63) and the bridge pipe connection seat (62) are installed and fixed through the flange mounting hole (633), the flange positioning hole (621), and connecting bolts.

8. The rear axle structure of an electric tricycle according to claim 7, characterized in that, The bridge tube (61) has a flange connection part (611) on its outer ring and a shaft insertion part (612) on its inner side. The flange connection part (611) is welded to the bridge tube insertion hole (632). A fixing plate mounting platform (613) is provided at the welding bevel of the flange connection part (611) facing the bridge tube connection seat (62). The bridge tube (61) is installed in the bridge tube positioning insertion hole (622) through the fixing plate mounting platform (613).

9. The rear axle structure of an electric tricycle according to claim 8, characterized in that, The insert shaft part (612) is provided with bearing mounting bases (6121) at both ends, and bearings are provided at the bearing mounting bases (6121). A retaining ring groove (6122) for holes is also provided on the outer side of the outer bearing, and a retaining ring for holes is provided in the retaining ring groove (6122).

10. The rear axle structure of an electric tricycle according to claim 9, characterized in that, The shock absorption mechanism (7) includes: a first shock absorber (71) and a second shock absorber (72).

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