Gear box assembly with motor and electric skateboard

Abstract

The utility model discloses a gearbox assembly with a motor and an electric skateboard, and the gearbox assembly comprises the motor which is used for providing a power source; the flange plate is connected with a shell of the motor; the gear box comprises a box body, an outer cover and a plurality of gear sets arranged between the box body and the outer cover, a plurality of mounting holes are formed in the box body, so that part of the gear sets are connected with the output end of the motor, an end cover is arranged outside the mounting holes, and the end cover is matched with the flange plate in a buckled mode. The gear sets at least comprise two input gear sets and one output gear set, the input gear sets and the output gear set are rotationally installed in the gear box through bearings, the input gear sets are meshed, and at least one input gear set is meshed with the output gear set. And rapid disassembly and rapid transmission ratio switching can be achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of skateboard body structure, concretely is a kind of motor gear box assembly. BACKGROUND

[0002] Traditional electric skateboard gear box generally adopts single reduction ratio (such as fixed reduction ratio 0.5), when facing the climbing scene of slope ≥15 °, output torque is insufficient (only 15Nm), leading to climbing difficulty;And when high-speed driving on flat road, motor speed is wasted seriously (such as motor 3000rpm when wheel hub speed is only 1500rpm), maximum speed is limited (≤25km / h).

[0003] The existing gear box and motor are fastened by 6-8 M4 screws, and the transmission assembly needs to be replaced by means of screwdriver, wrench and other tools, and the average disassembly time is more than 5 minutes, and it is difficult to maintain due to screw thread slipping. How to realize the convenient switching of transmission ratio in gear box to meet the demand of complex road conditions, while overcoming the problem of complicated disassembly caused by screw fastening position in traditional scheme, directly affects the overall performance and user experience of gear box. UTILITARY MODEL CONTENT

[0004] The utility model aims at providing a kind of motor gear box assembly, can realize quick disassembly and transmission ratio quick switching, to solve the problem in the background art.

[0005] To achieve the above object, the utility model provides the following technical scheme: a kind of motor gear box assembly, comprising:

[0006] Motor is used to provide power source;

[0007] Flange plate is connected with the shell of motor;

[0008] Gear box includes box, outer cover and multiple gear sets arranged between box and outer cover, multiple mounting holes are provided on the box, so that part of gear set is connected with motor output end, multiple mounting holes are provided with end cap, and the end cap is buckled with flange plate.

[0009] As further improvement of the above technical scheme:

[0010] The gear set comprises at least two input gear sets and one output gear set, the input gear sets and the output gear set are rotatably installed in the gear box through bearings, the input gear sets are engaged, and at least one input gear set is engaged with the output gear set. High-precision bearing support and gear engagement, the use of deep groove ball bearings and strict control of gear engagement side clearance greatly reduces the friction loss in the transmission process, so that the overall transmission efficiency is greater than or equal to 90%, which is 5% higher than that of the traditional gear box. The gear is made of 20CrMnTi material and is subjected to carburizing and quenching treatment, thereby improving the wear resistance and service life of the gear and further ensuring the durability of the transmission efficiency. The gear tooth number configuration realizes the secondary reduction transmission ratio of 0.222 and the primary reduction transmission ratio of 0.667 through ingenious tooth number design, effectively covering more than 90% of the common working conditions of the electric skateboard. The secondary transmission can increase the output torque to 68N·m, which is 353% higher than the 15N·m of the traditional single transmission ratio gear box, and can easily cope with the climbing demand of 18° and above slope. The primary transmission can increase the wheel hub speed to 2000rpm, corresponding to a speed of 35km / h, which meets the requirement of fast driving on flat road.

[0011] The arc-shaped clamping groove and the circular hole are arranged on the end cover, the limiting block is arranged on the flange plate, and the limiting block is embedded on the end cover after penetrating into the arc-shaped clamping groove.

[0012] The buckle is arranged above the arc-shaped clamping groove.

[0013] The limiting block is arranged on the end cover, and the buckle is arranged on the limiting block.

[0014] The motor is an outer rotor brushless motor.

[0015] The gear box is made of high-strength nylon material.

[0016] Compared with the prior art, the utility model has the advantages of:

[0017] Simplified structure and reduced volume: the unique end cover design sets the connecting port and the clamping groove corresponding to different transmission modes, discards the traditional complex transmission mechanism (such as shift fork, clutch, etc.), greatly simplifies the structure, reduces the overall volume by about 25%, and is more suitable for the compact space layout of the electric skateboard. This simplified design not only reduces the manufacturing cost, but also improves the reliability and maintenance convenience of the system.

[0018] Convenient operation and high efficiency: the efficient buckle and the compression spring piece are combined to realize the quick disassembly without tools, the user only needs to press the buckle and rotate the flange plate to complete the transmission ratio switching, the whole process takes only about 15-20 seconds, and the user experience is significantly improved.

[0019] This convenient operation mode allows users to quickly adjust the gear ratio according to different riding scenarios (such as climbing or flat road travel), thereby achieving optimal power output and energy consumption performance.

[0020] Lightweight design and increased endurance: The high-strength nylon shell is made of high-strength nylon 66 (PA66) material, effectively reducing the weight of the gear box while ensuring structural strength, making the overall weight only 350g, 30% lighter than traditional variable speed gear boxes.

[0021] Lightweight design not only improves the maneuverability of the electric skateboard, but also reduces energy consumption, further improving endurance. For example, under the same battery level, the riding endurance is increased by about 12%.

[0022] Reliability and durability: High-strength nylon material has excellent temperature resistance and impact resistance, ensuring the reliability and durability of the gear box in different environments. Gear meshing and bearing support design reduces the possibility of wear and failure, prolonging the service life of the gear box. The motor gear box assembly of the utility model realizes structure simplification, convenient operation, power performance improvement, transmission efficiency improvement, lightweight design and reliability enhancement through structural innovation, material optimization and precise design. These advantages make the gear box assembly particularly suitable for electric scooters and other applications that require compact structure, high efficiency transmission and flexible gear shifting, improving user experience and having broad market application prospects. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 The overall structure of the utility model is shown in the figure;

[0024] Figure 2 The exploded structure of the utility model is shown in the figure;

[0025] Figure 3 The top view structure of the utility model is shown in the figure;

[0026] Figure 4 The utility model is Figure 3 The A-A section view structure of the utility model is shown in the figure;

[0027] Figure 5 The C-C section view structure of the utility model is shown in the figure; Figure 3

[0028] The gear box external structure of the utility model is shown in the figure; Figure 6

[0029] The gear box internal structure of the utility model is shown in the figure; Figure 7

[0030] ​Figure 8 It is the outer cover structure schematic view of the utility model;

[0031] Figure 9 It is the buckle and the compression spring piece position schematic view of the utility model;

[0032] Figure 10 It is the end cover structure schematic view of the utility model;

[0033] Figure 11 It is the flange plate structure schematic view of the utility model.

[0034] Reference signs: 1, motor;2, flange plate;21, limit block;3, gear box;31, box body;32, outer cover;33, mounting hole;34, end cover;341, arc clamping groove;342, circular hole;343, limit bump;35, input gear set;36, output gear set;37, bearing;38, buckle;39, compression spring piece. DETAILED DESCRIPTION

[0035] In order to make the technical means, creation features, purposes and effects achieved by the utility model easy to understand, the utility model is further described below in combination with specific embodiments.

[0036] In the description of the utility model, it should be explained that the orientation or position indicated by the terms "upper", "lower", "inner", "outer", "front end", "rear end", "two ends", "one end", "the other end" and the like is based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and is not indicative or implied that the indicated device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the utility model. In addition, the terms "first" and "second" are only for the purpose of description, and cannot be understood as indicative or implied relative importance.

[0037] In the description of the utility model, it should be explained that, unless otherwise explicitly specified and limited, the terms "mounting", "provided with", "connection" and the like should be broadly understood, for example, "connection" can be fixed connection, can also be detachable connection, or integrally connected;It can be mechanical connection, or electrical connection;It can be directly connected, or indirectly connected through an intermediate medium, or the communication between two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0038] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0039] like Figures 1 to 11 As shown, the motor-driven gearbox assembly of this embodiment includes:

[0040] Motor 1 provides the power source; the entire gearbox is driven by the motor, which provides the power source for the system. Specifically, the selected motor is an external rotor brushless motor, and its model is chosen according to actual needs. Here, a rated power of 500W, an output shaft diameter of 8mm, a shaft length of 25mm, and an end keyway size of 4mm×4mm×10mm are selected. This type of motor features a compact structure, high efficiency and energy saving, and can be directly installed in the electric scooter.

[0041] Flange 2 connects to the housing of motor 1 and is secured to motor 1 using three M3×10mm countersunk screws. The flange is a rigid structural component used to secure the motor and facilitate assembly with other components of the gearbox. Specifically, one side of the flange is directly connected to the motor housing, and its outer surface has specific limiting blocks 21. These limiting blocks 21 are precisely embedded into relevant slots in the gearbox during assembly, providing a fixing function and ensuring relatively accurate positioning between the entire gear transmission mechanism and the motor, facilitating subsequent gear switching. Flange 2 is a disc with a diameter of 60mm and a thickness of 8mm.

[0042] The gearbox 3 includes a housing 31, an outer cover 32, and three gear sets disposed between the housing 31 and the outer cover 32. The housing 31 has two mounting holes 33 for connecting two gear sets to the output end of the motor 1. End covers 34 are fitted outside the two mounting holes 33, and these end covers 34 engage with the flange 2. The gearbox serves as the main housing and mounting platform for the gear sets, primarily comprising the housing and outer cover, and is equipped with multiple transmission gear sets to meet different power transmission requirements. The gearbox is made of high-strength nylon material, a feature that not only reduces the overall weight of the equipment but also ensures durability and reliability in complex environments. The interior of the housing has a precisely designed structure to fix the position and meshing method of each gear set.

[0043] The gear set includes two input gear sets 35 and one output gear set 36. The input gear sets 35 and the output gear set 36 are rotatably mounted in the gearbox 3 via bearings 37. The two input gear sets 35 mesh, and the input gear set 35 meshes with one of the output gear sets 36.

[0044] The end cover 34 is provided with an arc-shaped clamping groove 341 and a circular hole 342, and the flange plate 2 is provided with a limiting block 21. After the limiting block 21 penetrates through the arc-shaped clamping groove 341, it is embedded on the end cover 34.

[0045] The gear box 3 is provided with a buckle 38, and a compression spring piece 39 is arranged between the buckle 38 and the gear box 3. The buckle 38 is arranged above the arc-shaped clamping groove 341.

[0046] The end cover 34 is provided with a limiting block 343, and the buckle 38 is arranged on the limiting block 343.

[0047] The specific values are as follows: the diameter of the end cover 34 is 70 mm, the thickness is 10 mm, two connecting ports are provided, a first connecting port (for two-stage transmission, high-torque mode) and a second connecting port (for one-stage transmission, high-speed mode), the depth of the connecting ports is 15 mm, and the arc-shaped clamping groove 341 and the buckle 38 are correspondingly arranged. The gear set includes a one-stage driving gear with a tooth number of 12 and a module of 2, a two-stage gear with a tooth number of 36 and a module of 2, and an output gear with a tooth number of 54 and a module of 2, which are all made of 20CrMnTi material. The one-stage driving gear and the two-stage gear are input gear sets 35, which are installed in the gear box 3 through deep groove ball bearings. The gear box 3 is made of high-strength nylon 66 (PA66) and has a split structure, which is fastened by four M2.5×8 mm screws.

[0048] The motor gear box assembly of the embodiment is installed on an electric skateboard, and its use method is introduced. When in use, the user should check whether the electric skateboard has sufficient power, whether all components are stably connected, and whether the gear box is damaged. At this time, the gear box is in one-stage transmission (high-speed mode), which is suitable for riding on flat roads to a mountain park.

[0049] Climbing stage:

[0050] After reaching the mountain park, the user rides to a slope with a slope of about 18°. Since the current one-stage transmission cannot provide sufficient torque, the user decides to switch to two-stage transmission (high-torque mode).

[0051] The user presses (or can be understood as pushes) the buckle 38 on the flange plate 2 with the thumb and index finger at the same time, applies a pressure of about 8-10 N, overcomes the elastic force of the compression spring piece 39, and makes the buckle 38 disengage from the clamping groove of the first connecting port of the end cover 34. Then, the flange plate 2 is rotated counterclockwise as a whole, and the motor 1 is pulled out from the first connecting port of the end cover 34. Then, the flange plate 2 is inserted into the second connecting port of the end cover 34 and rotated clockwise. At this time, the buckle 38 is automatically clamped into the clamping groove under the action of the compression spring piece 39, and the transmission ratio switching is completed. The whole process takes about 15 seconds.

[0052] After the switch is completed, the user starts the electric skateboard, and the output shaft of the outer rotor brushless motor drives the primary driving gear at a speed of 3000 rpm. The primary driving gear meshes with the secondary gear, and the speed of the secondary gear is reduced to 1000 rpm (12:36 reduction). The secondary gear meshes with the output gear, and the speed of the output gear is further reduced to 666 rpm (36:54 reduction), and the output torque is increased to 68 N·m. Under the drive of large torque, the electric skateboard easily climbs an 18° slope, and the whole climbing process is smooth and smooth, without power shortage or stagnation.

[0053] Flat road phase:

[0054] After the climb, enter the flat leisure road section in the park. In order to improve the driving speed, the user decides to switch the transmission ratio back to the primary transmission (high speed mode). The user presses the buckle 38 again, repeats the above quick disassembly operation, pulls out the motor and flange from the second connection port of the end cover, inserts it into the first connection port and rotates to fix it, and completes the switch.

[0055] After the switch, the motor output shaft directly drives the secondary gear at a speed of 3000 rpm. The secondary gear meshes with the output gear, and the speed of the output gear is increased to 2000 rpm, and the corresponding hub speed reaches 35 km / h. The user enjoys the joy of fast riding on flat roads, and because the motor works in the high efficiency zone, the energy consumption is reduced, and compared with the electric skateboard using the traditional single transmission ratio gearbox, the cruising range of this ride is increased by about 12% under the same power.

[0056] Unique end cover design: The end cover is provided with connection ports corresponding to the secondary transmission (high torque mode) and the primary transmission (high speed mode). The depth of the connection port is 15 mm, and the inner wall is provided with a precisely matched clamping groove matched with the buckle on the motor connecting flange, to realize the coaxial switching of the motor output shaft and different gears. This design discards the traditional complex transmission mechanism such as shift fork, clutch, etc., greatly simplifies the structure, reduces the overall volume by about 25%, and is more suitable for the compact space layout of the electric skateboard.

[0057] Efficient buckle and spring piece combination: The flange is provided with buckles, and each group of buckles is installed at the bottom of the spring piece made of 65Mn spring steel with a thickness of 1 mm. When switching the transmission ratio, the user only needs to press the adjacent two groups of buckles at the same time, apply a pressure of 8-10 N, overcome the spring force of the spring piece, make the clamping hook disengage from the end cover clamping groove, and then rotate the flange to complete the replacement of the connection port. The whole quick disassembly process does not require any tools, and the time consumption is only about 15-20 seconds, the operation is simple and fast, and the user experience is significantly improved.

[0058] Optimized gear tooth configuration: the gear set includes a primary driving gear with 12 teeth and a module of 2, a secondary gear with 36 teeth and a module of 2, and an output gear with 54 teeth and a module of 2. Through ingenious tooth design, a secondary reduction transmission ratio of 0.222 and a primary reduction transmission ratio of 0.667 are achieved. In a mountain park riding scenario, the secondary transmission can increase the output torque to 68 N·m, which is 353% higher than the 15 N·m of a traditional single transmission ratio gear box, easily meeting the climbing demand of slopes of 18° and above; the primary transmission can increase the hub speed to 2000 rpm, corresponding to a speed of 35 km / h, meeting the requirement of fast driving on flat roads, effectively covering more than 90% of the common working conditions of electric skateboards.

[0059] High-precision bearing support and gear meshing: the gear is installed in the gear box through a deep groove ball bearing with an inner diameter of 8 mm and an outer diameter of 22 mm, high installation precision, and radial runout ≤0.02 mm, greatly reducing the friction loss in the transmission process. At the same time, the gear meshing side clearance is strictly controlled within 0.1-0.15 mm, ensuring the stability and efficiency of power transmission. The gear is made of 20CrMnTi material and is subjected to carburizing and quenching treatment, with a tooth surface hardness of HRC58-62, improving the wear resistance and service life of the gear, and making the overall transmission efficiency ≥90%, which is 5% higher than that of the traditional gear box.

[0060] High-strength nylon shell: the gear box shell is made of high-strength nylon 66 (PA66) material, which has the advantages of low density (1.15 g / cm³), high strength, and wide temperature resistance range (-40℃~120℃). Compared with metal materials, the weight of the gear box is effectively reduced under the premise of ensuring structural strength, so that the overall weight is only 350 g, which is 30% lighter than the traditional variable speed gear box. The lightweight design not only improves the control flexibility of the electric skateboard, but also reduces energy consumption, further improving the endurance. The above is only an embodiment of the present application, and the well-known specific structures and characteristics in the scheme are not described in detail. For those skilled in the art, it is obvious that the present application is not limited to the details of the above exemplary embodiments, and can be realized in other specific forms without departing from the spirit or basic characteristics of the present application. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting, the scope of the present application is defined by the appended claims rather than the above description, and therefore all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present application. Any reference signs in the claims should not be considered as limiting the claims.

Claims

1. A gearbox assembly with a motor, characterized in that, include: Electric motor (1), used to provide a power source; The flange (2) is connected to the housing of the motor (1); The gearbox (3) includes a housing (31), an outer cover (32), and multiple gear sets disposed between the housing (31) and the outer cover (32). The housing (31) is provided with multiple mounting holes (33) so that some gear sets are connected to the output end of the motor (1). End covers (34) are provided outside the multiple mounting holes (33), and the end covers (34) are snap-fitted with the flange (2). The end cap (34) is provided with an arc-shaped groove (341) and a circular hole (342), and the flange (2) is provided with a limiting block (21). The limiting block (21) passes through the arc-shaped groove (341) and is embedded in the end cap (34). The gearbox (3) is provided with a buckle (38), and a pressure spring (39) is provided between the buckle (38) and the gearbox (3). The buckle (38) is located above the arc-shaped groove (341).

2. The gearbox assembly with motor according to claim 1, characterized in that, The gear set includes at least two input gear sets (35) and one output gear set (36). The input gear sets (35) and the output gear sets (36) are rotatably mounted in the gearbox (3) via bearings (37). The input gear sets (35) mesh, and at least one set of input gear sets (35) meshes with the output gear set (36).

3. The gearbox assembly with motor according to claim 1, characterized in that, The end cap (34) is provided with a limiting protrusion (343), and the buckle (38) is provided on the limiting protrusion (343).

4. The gearbox assembly with motor according to claim 3, characterized in that, The motor (1) is an external rotor brushless motor.

5. The gearbox assembly with motor according to claim 1, characterized in that, The gearbox (3) is made of high-strength nylon material.

6. An electric skateboard, characterized in that: The motor-driven gearbox assembly described in any one of claims 1-5 is adopted.

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