Middle motor of water power-assisted vehicle and water power-assisted vehicle

Abstract

The utility model relates to a middle motor of a water power-assisted vehicle and the water power-assisted vehicle. The middle motor comprises a machine shell, a motor assembly, a transmission assembly, a transmission shaft, a first sealing piece, a second sealing piece, a third sealing piece and a shell sealing piece. The machine shell comprises a first shell body and a second shell body which jointly form a containing space. According to the transmission assembly, one part of an output gear assembly is located in the containing space, and the other part is located outside the containing space; the transmission shaft penetrates through the axis of the output gear assembly and penetrates through the machine shell. The first sealing piece forms liquid seal at the joint of the transmission shaft and the output gear assembly; the second sealing piece forms liquid sealing at the joint of the output gear assembly and the first side of the machine shell; the third sealing piece forms liquid seal at the joint of the transmission shaft and the second side of the shell; the shell sealing piece forms liquid sealing at the joint of the first shell and the second shell. Through the sealing effect of the sealing elements, the waterproof performance of the middle motor is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of motors, in particular to a mid-mounted motor of a water-assisted vehicle and the water-assisted vehicle. Background Art

[0002] The mid-mounted motor is usually placed in the middle of the frame of the power-assisted vehicle to assist the vehicle in driving. Water-assisted vehicles are mostly used in lakes, rivers or seas, and the mid-mounted motor has a high waterproof performance requirement.

[0003] At present, most mid-mounted motors have asbestos-free gaskets at the plug-in power interface, and use the motor housing or the power interface structure to squeeze the asbestos-free gasket for waterproofing. This sealing method can reduce the possibility of water ingress at the power interface, but the mid-mounted motor still has other connections that may have water ingress, such as the connection involving rotating parts. Therefore, this type of mid-mounted motor can only meet the waterproof requirements in rainy or snowy weather, and cannot be used in water-assisted vehicles. Utility Model Content

[0004] Problems to be solved by utility models

[0005] In view of the problem that the current mid-mounted motor has poor waterproof performance, the present disclosure provides a mid-mounted motor for a water-assisted vehicle and a water-assisted vehicle.

[0006] Solutions for solving problems

[0007] A first aspect of the present disclosure provides a mid-mounted motor for a water-assisted vehicle, the mid-mounted motor comprising:

[0008] The housing comprises a first shell and a second shell, wherein the second shell and the first shell together form a receiving space;

[0009] A motor assembly, used for providing driving force; the motor assembly is located in the accommodation space;

[0010] The transmission assembly comprises: an output gear assembly, wherein the output gear assembly is configured to be connected to a crankset in the water-assisted vehicle and to drive the crankset to rotate under the driving force generated by the motor assembly; a part of the output gear assembly is located in the accommodation space, and another part of the output gear assembly is located outside the accommodation space;

[0011] A transmission shaft is arranged on the axis of the output gear assembly and penetrates the housing. The two ends of the transmission shaft extending out of the housing are respectively connected to the two pedal assemblies of the water-assisted vehicle. The transmission shaft is configured to rotate under the action of the rotating pedal assembly.

[0012] a first sealing member, located at a first side of the housing and sealingly connected to the output gear assembly and the transmission shaft, respectively, so as to form a liquid seal at a connection between the transmission shaft and the output gear assembly;

[0013] A second sealing member is located at the first side of the housing and is sealingly connected to the output gear assembly and the housing, respectively, so as to form a liquid seal at the connection between the output gear assembly and the first side of the housing;

[0014] a third sealing member, located on the second side of the housing, and sealingly connected to the housing and the transmission shaft respectively, so as to form a liquid seal at the connection between the transmission shaft and the second side of the housing; wherein the second side is the opposite side of the first side;

[0015] The housing seal is provided with a storage groove, wherein the first housing and / or the second housing has a storage groove; the housing seal is located in the storage groove to form a liquid seal at the connection between the first housing and the second housing.

[0016] Optionally, the housing seal comprises a sealant or a sealing strip arranged in the groove.

[0017] The output gear assembly has a shaft hole for the transmission shaft to pass through;

[0018] The first sealing member is a sealing ring, which is located in the shaft hole and has an interference fit with the hole wall of the shaft hole.

[0019] Optionally, the first seal is interference fit with the transmission shaft.

[0020] Optionally, the housing has a first avoidance hole for the output gear assembly to pass through, and the second sealing member is a sealing ring. The second sealing member is located in the first avoidance hole and has an interference fit with a hole wall of the first avoidance hole.

[0021] Optionally, the second seal is interference fit with the output gear assembly.

[0022] Optionally, the housing has a second avoidance hole for the transmission shaft to pass through, and the third sealing member is a sealing ring. The third sealing member is located in the second avoidance hole and has an interference fit with the hole wall of the second avoidance hole.

[0023] Optionally, the third seal is interference fit with the transmission shaft.

[0024] Optionally, at least one of the first seal, the second seal and the third seal comprises:

[0025] An annular body and an annular protrusion, wherein the annular protrusion is located inside the annular body and protrudes toward the center of the annular body, and the number of the annular protrusion is at least one;

[0026] The annular protrusion of the first sealing member and the annular protrusion of the third sealing member are both sealedly connected to the transmission shaft;

[0027] The annular protrusion of the second sealing member is sealingly connected to the output gear assembly.

[0028] Optionally, the number of the annular protrusions is two, the two annular protrusions are respectively a first protrusion and a second protrusion, and are spaced apart and distributed along the axial direction of the transmission shaft;

[0029] The second protrusion of the first seal is located between the first protrusion of the first seal and the second side of the housing, and the second protrusion of the second seal is located between the first protrusion of the second seal and the second side of the housing; the second protrusion of the third seal is located between the first protrusion of the third seal and the first side of the housing;

[0030] An inner diameter of the first protrusion is greater than an inner diameter of the second protrusion.

[0031] Optionally, the outer diameter of the first sealing member is 28-28.3 mm, or 28-28.015 mm; the inner diameter of the first protrusion in the first sealing member is 20.3-20.7 mm, or 20.6-21 mm, and the inner diameter of the second protrusion in the first sealing member is 21.0-21.4 mm;

[0032] The outer diameter of the second seal is 56-56.2 mm, or 56-56.35 mm, the inner diameter of the first protrusion in the second seal is 46.7-47.3 mm, or 46.8-47.2 mm; the inner diameter of the second protrusion in the second seal is 47.4-47.8 mm;

[0033] The heights of the first seal and the second seal along the axial direction of the transmission shaft are both 3.8-4.2 mm;

[0034] The third seal has the same size as the first seal.

[0035] Optionally, the third seal is mounted on the second shell.

[0036] Optionally, the housing has a through hole, and the central motor further comprises: a power interface corresponding to the position of the through hole, a male terminal mounting position distributed around the through hole, and a female terminal mounting position distributed around the male terminal mounting position;

[0037] The power interface comprises: a male end connector installed on the male end mounting position, and a female end connector that can be connected to the female end mounting position, and the female end connector is detachably connected to the male end connector;

[0038] The male end connector has a first conductive member, and the female end connector has a second conductive member. When the female end connector is connected to the male end connector, the first conductive member and the second conductive member are electrically connected to supply power to the central motor.

[0039] Optionally, the mid-mounted motor further comprises: a male end seal and a female end seal;

[0040] The male end sealing member is located between the male end mounting position and the male end connector to form a liquid seal at the connection between the male end mounting position and the male end connector;

[0041] The female end seal is located between the female end mounting position and the female end connector to form a liquid seal at the connection between the female end mounting position and the female end connector.

[0042] The power interface further includes: a fourth sealing member, wherein the fourth sealing member is located between the male end connector and the female end connector to form a liquid seal at the connection between the male end connector and the female end connector.

[0043] Optionally, the male end connector comprises: a male end body and a male end flange distributed around the male end body, and the first conductive member is located on the male end body;

[0044] The male end body is partially inserted into the through hole, and the fourth sealing member is sleeved outside the male end body; the male end sealing member is located between the male end mounting position and the male end flange;

[0045] The female end connector comprises a female end body and a female end flange distributed around the female end body; the second conductive member is located on the female end body;

[0046] The female end body is sleeved outside the male end body, the fourth sealing member is located between the male end body and the female end body, and the female end sealing member is sleeved outside the female end body and located between the female end mounting position and the female end flange.

[0047] Optionally, the central motor further comprises: a first plug fastener and a second plug fastener, the first plug fastener respectively passing through the male end flange and the male end mounting position to connect the male end connector and the housing;

[0048] The second plug fastener passes through the female end flange and the female end mounting position respectively to connect the female end connector and the housing.

[0049] Optionally, the first conductive member includes: a power terminal and a signal terminal.

[0050] Optionally, the transmission assembly includes at least one stage transmission structure, wherein the output gear assembly is a gear assembly of the final stage transmission structure in the transmission assembly.

[0051] Optionally, the output gear assembly includes an output gear and a sleeve, the sleeve is sleeved outside the output gear, the second seal is sealingly connected to the sleeve, and the transmission shaft is connected to the output gear.

[0052] A second aspect of the present disclosure provides a water-assisted vehicle, the water-assisted vehicle comprising:

[0053] Frame;

[0054] The mid-mounted motor of the water-assisted vehicle described in the first aspect of the embodiment is installed on the frame.

[0055] Effect of utility model

[0056] In the disclosed embodiment, when the central motor is working, the transmission shaft and the output gear assembly are both rotating parts. The transmission shaft runs through the housing, and then both ends of the transmission shaft are partially exposed outside the accommodation space. By respectively providing the first seal and the third seal at the rotation of the exposed parts at both ends of the transmission shaft, liquid sealing is achieved at the connection between the output gear assembly and the transmission shaft, and at the connection between the housing and the transmission shaft, respectively, to limit the liquid in the external environment from entering the interior of the central motor through the rotation of the rotating shaft.

[0057] The output gear assembly is partially exposed outside the first side of the housing, and the second seal is used to seal the connection between the exposed part of the output gear assembly and the housing, thereby limiting the liquid in the external environment from entering the interior of the mid-mounted motor through the connection between the output gear assembly and the housing. The housing seal forms a liquid seal at the connection between the first housing and the second housing, further improving the waterproof performance of the mid-mounted motor. The disclosed embodiment improves the waterproof performance of the mid-mounted motor through the sealing effect of the first seal, the second seal, the third seal, the third seal and the housing seal, so that the mid-mounted motor can be used in water for a long time without water ingress, and can be applied to water-assisted vehicles.

[0058] The water-assisted vehicle of the disclosed embodiment includes the above-mentioned mid-mounted motor, and thus the water-assisted vehicle also has the above-mentioned beneficial effects, satisfying its waterproof requirements for long-term operation in water. BRIEF DESCRIPTION OF THE DRAWINGS

[0059] Figure 1 This is a schematic diagram of the appearance structure of a central motor in an optional embodiment of the present disclosure;

[0060] Figure 2 for Figure 1 A schematic diagram of the partial structure of the second side of the middle casing;

[0061] Figure 3 for Figure 1 Cross-sectional view of the mid-mounted motor;

[0062] Figure 4 for Figure 3 Enlarged view of point A in the middle;

[0063] Figure 5 for Figure 3 Enlarged view of point B in the middle;

[0064] Figure 6 for Figure 1 A cross-sectional view of a first sealing member;

[0065] Figure 7 for Figure 1 A schematic diagram of the structure of the second shell;

[0066] Figure 8 for Figure 1 A schematic structural diagram of the first shell;

[0067] Fig. 9 for Figure 1 A schematic diagram of a portion of the structure of the central motor when the middle male end connector is installed on the first housing;

[0068] Fig.10 It is a schematic diagram of the structure when the male end connector and the female end connector are separated;

[0069] Fig.11 for Figure 1 Cross-sectional view of the male and female connectors when connected;

[0070] Fig.12 for Figure 1 Schematic diagram of the structure when the motor assembly and transmission assembly of the mid-mounted motor are connected.

[0071] Description of Reference Numerals

[0072] 110, housing; 101, accommodating space; 102, second avoidance hole; 103, first protrusion; 104, second protrusion; 105, annular protrusion; 111, second housing; 1112, through hole; 1113, male end mounting position; 1114, female end mounting position; 112, first housing; 1121, first avoidance hole; 1122, storage slot;

[0073] 120, motor assembly; 121, stator assembly; 122, rotor assembly; 123, output shaft;

[0074] 130, transmission assembly; 131, output gear assembly; 1311, shaft hole; 1312, shaft sleeve; 1313, output gear;

[0075] 140, torque sensor assembly; 150, first seal; 160, second seal; 170, third seal; 180, transmission shaft;

[0076] 190, power interface; 191, male connector; 1911, male body; 1912, male flange; 1913, first conductive member; 1914, power terminal; 1915, signal terminal; 192, female connector; 1921, female flange; 1922, female body; 1923, second conductive member; 193, male seal; 194, female seal; 195, first mounting hole; 196, second mounting hole; 197, first plug fastener; 198, second plug fastener; 199, fourth seal. DETAILED DESCRIPTION

[0077] In order to make the technical solutions and beneficial effects of the embodiments of the present disclosure more obvious and easy to understand, the following is a detailed description by listing specific embodiments. The drawings are not necessarily drawn to scale, and local features may be enlarged or reduced to more clearly show the details of the local features; unless otherwise defined, the technical and scientific terms used herein have the same meaning as those in the technical field to which this application belongs.

[0078] In the description of the embodiments of the present disclosure, terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "height", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of simplified description of the embodiments of the present disclosure, and do not indicate that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and should not be understood as a limitation on the embodiments of the present disclosure.

[0079] In the embodiments of the present disclosure, the terms "first" and "second" are only used for the purpose of clear description and cannot be understood as the relative importance of the indicated features or the number of the indicated technical features. Therefore, the features defined as "first" and "second" can explicitly include at least one of the features. In the description of the embodiments of the present disclosure, the meaning of "multiple" is at least two, such as two, three, etc.; the meaning of "several" is at least one, such as one, two, three, etc., unless otherwise clearly and specifically defined.

[0080] In the embodiments of the present disclosure, unless otherwise clearly defined, the terms "installed", "connected", "connected", "fixed", "set", etc. should be understood in a broad sense. For example, "connection" 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, or 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 embodiments of the present disclosure can be understood according to the specific circumstances.

[0081] In the embodiments of the present disclosure, unless otherwise clearly defined, a first feature being “on”, “above”, “above”, “below”, “below”, “below” or “below” a second feature may mean that the first feature is in direct contact with the second feature, or the first feature and the second feature are in indirect contact with each other through an intermediate medium. Moreover, a first feature being “on”, “above” or “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the horizontal height of the first feature is higher than the horizontal height of the second feature. A first feature being “below”, “below” or “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the horizontal height of the first feature is less than the horizontal height of the second feature.

[0082] In the disclosed embodiment, the waterproof grade IPX is an internationally used waterproof grade certification system. It is used to mark the waterproof grade of a product on many instruments and equipment such as outdoor and diving, and is one of the most common technical indicators.

[0083] The IPX waterproof rating is divided into 8 levels, from IPX-1 to IPX-8, with increasing waterproof capabilities. IPX-0 means it is not waterproof at all. The IPX-2 level is basically the same as IPX-1. Under normal operating conditions, the device can provide waterproof protection equivalent to 3-5 mm / minute rainfall for 10 minutes. The IPX-4 level is basically the same as IPX-3, with improved waterproof duration, waterproof angle, and waterproof performance in pressure-resistant environments. IPX-5 can provide all-round and angle waterproof protection, providing 2-3 minutes of 12.5 liters / second flow rate and 30n / m pressure waterproof protection. IPX-6 can provide waterproof protection against large waves, and it can withstand a depth of 3 meters underwater, a flow rate of 100 liters / minute, and a pressure of 100n / m for 2-3 minutes. IPX-7 can be immersed in 1 meter underwater for 30 minutes. IPX-8 has a longer waterproof time and more thorough waterproof protection.

[0084] like Figure 1 As shown, the mid-mounted motor of the water-assisted vehicle provided in the embodiment of the present disclosure includes: a housing 110, a motor assembly 120 (see Figure 3 and Fig.12), transmission assembly 130 and transmission shaft 180.

[0085] The motor assembly 120 is used to provide driving force, and the transmission assembly 130 is respectively connected to the motor assembly 120 and the crankset in the water-assisted vehicle. The transmission assembly 130 can transmit the driving force generated by the motor assembly 120 to the crankset to drive the crankset to rotate. The transmission shaft 180 can be connected to two pedal assemblies of the water-assisted vehicle. The pedal assembly includes a pedal and a crank. The crank is respectively connected to the pedal and the transmission shaft. When the pedal rotates under the action of an external force, the crank can drive the rotation shaft 180 to rotate.

[0086] The water-assisted vehicle refers to a water-assisted electric bicycle, but is not limited thereto.

[0087] The driving modes of the water-assisted vehicle include: power-assisted mode.

[0088] For example, Fig.12 As shown, the mid-mounted motor includes a torque sensor assembly 140, and the torque sensor assembly 140 is located in the accommodating space 101. The torque sensor assembly 140 can detect the torque condition output by the transmission shaft 180, so as to control the operation of the motor assembly 120 so that the driving force torque and other output parameters output by it meet the requirements. Other output parameters include but are not limited to the rotation speed. Take the power-assisted mode of a person stepping on the pedal as an example: after the person steps on the pedal, the transmission shaft 180 is forced to rotate, and the external force exerted on the transmission shaft 180 is transmitted to the torque sensor assembly 140 (such as the torque sensor assembly 140) in the mid-mounted motor through the engaged ratchet pawl (a type of clutch) Fig.12 As shown in FIG. 1 , the torque sensor assembly 140 generates an induction signal and transmits it to the controller, so that the controller drives the motor assembly 120 to operate. Under the action of a one-way rotating member (such as a one-way needle bearing), the torque generated by the motor assembly 120 is transmitted to the transmission assembly 130, and the torque is transmitted to the chainring through the output gear assembly 131 of the transmission assembly 130. The chainring transmits the torque to the driving sprocket of the vehicle through the chain, thereby driving the vehicle to move forward.

[0089] In some embodiments, the power-assisted mode can also be operated without the participation of pedals and transmission shafts, for example: the handle of the vehicle is turned, and the rotation signal of the handle is transmitted to the controller, and the controller motor assembly 120 operates. Under the action of a one-way rotating member (such as a one-way needle bearing), the torque generated by the motor assembly 120 is transmitted to the transmission assembly 130, and the torque is transmitted to the chainring through the output gear assembly 131 of the transmission assembly 130. The chainring transmits the torque to the driving sprocket of the vehicle through the chain to drive the vehicle to move forward. Since the motor assembly 120 rotates and drives the ratchet ring to operate through the transmission assembly 130, the pawl is disengaged from the ratchet ring, and then disengaged from the transmission shaft 180, the torque generated by the motor assembly 120 does not need to drive the transmission shaft 180, the crank, and the pedals to rotate together.

[0090] In some embodiments, the driving mode of the water-assisted vehicle may also include a non-assisted mode. In this mode, the force is provided by the clutch and the one-way rotating member, and the transmission shaft 180 can drive the crankshaft to rotate to achieve vehicle driving, without the participation of the motor assembly 120, and the non-assisted mode is achieved by stepping on the pedals.

[0091] It is understandable that the water-assisted vehicle can have both a power-assisted mode and a non-power-assisted mode.

[0092] When the water-assisted vehicle travels in water, the central motor may be fully or partially immersed in water. The "water" here includes but is not limited to fresh water in rivers and lakes, and may also refer to salt water such as sea water.

[0093] like Figure 3 As shown, the housing 110 has a containing space 101, and the motor assembly 120 is located in the containing space 101. The transmission assembly 130 includes an output gear assembly 131, a part of the output gear assembly 131 is located in the containing space 101, and the other part of the output gear assembly 131 is located outside the containing space 101. The output gear assembly 131 is configured to: connect to the chainring in the water-powered vehicle, and drive the chainring to rotate under the driving force generated by the motor assembly 120. The transmission shaft 180 is passed through the axis of the output gear assembly 131 and penetrates the housing 110. The two ends of the transmission shaft 180 extending out of the housing 110 are respectively connected to the two pedal assemblies of the water-powered vehicle; the transmission shaft 180 is configured to: rotate under the action of the rotating pedal assembly.

[0094] The housing 110 can not only provide a mounting carrier for fixing the motor assembly 120 and the transmission assembly 130 , but also protect the two by preventing liquid in the external environment from entering the interior of the accommodation space 101 .

[0095] Figure 2 for Figure 1 Schematic diagram of part of the structure from the a direction perspective.

[0096] like Figure 1 and Figure 2As shown, the mid-mounted motor further includes: a first seal 150, a second seal 160 and a third seal 170. The first seal 150 is located on the first side of the housing 110, and is sealed and connected to the output gear assembly 131 and the transmission shaft 180, respectively, so as to form a liquid seal at the connection between the transmission shaft 180 and the output gear assembly 131; the second seal 160 is located on the first side of the housing 110, and is sealed and connected to the output gear assembly 131 and the housing 110, respectively, so as to form a liquid seal at the connection between the output gear assembly 131 and the first side of the housing 110; the third seal 170 is located on the second side of the housing 110, and is sealed and connected to the housing 110 and the transmission shaft 180, respectively, so as to form a liquid seal at the connection between the transmission shaft 180 and the second side of the housing 110; wherein the second side is the opposite side of the first side.

[0097] Figure 1 In the embodiment, the first side refers to the rear side of the mid-mounted motor, and the second side refers to the front side of the mid-mounted motor.

[0098] like Figure 1 As shown, both ends of the central motor transmission shaft 180 and a portion of the output gear assembly 131 are exposed outside the accommodating space 101 .

[0099] When the middle motor is working, the transmission shaft 180 and the output gear assembly 131 are both rotating parts. By respectively arranging the first seal 150 and the third seal 170 at the rotational positions of the exposed parts at both ends of the transmission shaft 180, liquid sealing is achieved at the connection between the output gear assembly 131 and the transmission shaft 180, and at the connection between the housing 110 and the transmission shaft 180, respectively, to limit the liquid in the external environment from entering the middle motor through the rotational position of the transmission shaft 180.

[0100] The output gear assembly 131 is partially exposed outside the first side of the housing 110, and the second seal 160 is used to seal the connection between the exposed portion of the output gear assembly 131 and the housing 110, thereby limiting the liquid in the external environment from entering the interior of the mid-mounted motor through the connection between the output gear assembly 131 and the housing 110. Therefore, through the sealing effect of the first seal 150, the second seal 160 and the third seal 170, the waterproof performance of the mid-mounted motor is improved, and the mid-mounted motor can be applied to water-assisted vehicles.

[0101] Compared with the mid-mounted motor in the prior art, the mid-mounted motor in the embodiment of the present disclosure can allow the water-assisted vehicle to travel in the water for a longer period of time, meeting the higher demand for waterproofing of the water-assisted vehicle.

[0102] The first seal 150, the first seal 150 and the first seal 150 can be made of a material with good oil resistance and corrosion resistance. For example, the material of the three seals can be fluororubber. In the embodiment shown in the present disclosure, the material of the three seals is vinylidene fluoride fluororubber (FKM), and the seal of this material can be better suitable for seawater environment.

[0103] Figure 4 for Figure 3 The enlarged view of the transmission shaft 180 is removed from the center A. Figure 3 and Figure 4 The output gear assembly 131 has a shaft hole 1311 for the transmission shaft 180 to pass through; the first sealing member 150 is a sealing ring, the first sealing member 150 is located in the shaft hole 1311 and has an interference fit with the hole wall of the shaft hole 1311.

[0104] The first seal 150 is press-fitted into the shaft hole 1311 of the output gear assembly 131, and the first seal 150 is squeezed after the transmission shaft 180 is inserted into the shaft hole 1311, that is, the first seal 150 and the transmission shaft 180 are interference fit, so that the first seal 150 limits the liquid from entering the accommodating space 101 from the rotation point of the output gear assembly 131 and the transmission shaft 180.

[0105] like Figure 4 As shown, according to some optional embodiments, the housing 110 has a first avoidance hole 1121 for the output gear assembly 131 to pass through, and the second seal 160 is a sealing ring. The second seal 160 is located in the first avoidance hole 1121 and has an interference fit with the hole wall of the first avoidance hole 1121.

[0106] The second seal 160 is press-fitted into the first avoidance hole 1121 of the housing 110, and the output gear assembly 131 is inserted into the first avoidance hole 1121 to squeeze the second seal 160, that is, the second seal 160 and the output gear assembly 131 are interference fit, so that the second seal 160 limits the liquid from entering the accommodating space 101 from the rotation point between the output gear assembly 131 and the housing 110.

[0107] Figure 5 for Figure 3 The enlarged view of the transmission shaft 180 is removed from B. Figure 3 and Figure 5 The housing 110 has a second avoidance hole 102 for the transmission shaft 180 to pass through. The third sealing member 170 is a sealing ring. The third sealing member 170 is located in the second avoidance hole 102 and has an interference fit with the hole wall of the second avoidance hole 102.

[0108] The third sealing member 170 is press-fitted on the housing 110 and is located in the second avoidance hole 102. After the transmission shaft 180 is inserted into the second avoidance hole 102, it partially extends out of the accommodation space 101, and the transmission shaft 180 presses the third sealing member 170, that is, the third sealing member 170 and the transmission shaft 180 are interference-fitted to limit the liquid from the rotation point of the housing 110 and the transmission shaft 180 into the accommodation space 101.

[0109] Optionally, the first seal 150, the second seal 160 and the third seal 170 are all separate components. After the three seals (the first seal 150, the second seal 160 and the third seal 170) are used for three-level sealing, the waterproof level of the central motor can be improved from the current IPX-5 waterproof level to IPX-7. Figure 4 and Figure 5 As shown, optionally, the structures of the first sealing member 150 , the second sealing member 160 and the third sealing member 170 are all the same.

[0110] In some embodiments not shown in the present disclosure, the structures of the first seal 150, the second seal 160 and the third seal may be completely different, or two of them may have the same structure. Wherein, when the structures of the three seals are not completely the same, the structure of at least one seal (referring to one of the first seal 150, the second seal 160 and the third seal 170) may be the same as the seal structure of the embodiment shown in the present disclosure.

[0111] In the embodiments shown in the present disclosure, Figures 4 to 6 As shown, the first sealing member 150 , the second sealing member 160 and the third sealing member 170 each include: an annular body and an annular protrusion 105 , wherein the annular protrusion 105 is located inside the annular body and protrudes toward the center of the annular body.

[0112] The annular protrusion 105 may also be referred to as a sealing lip.

[0113] For the first seal 150 , the outer side (ie, the annular body) of the first seal 150 is sealed and connected to the output gear assembly 131 , and the inner side of the first seal 150 is sealed and connected to the transmission shaft 180 via the annular protrusion 105 .

[0114] As for the second sealing member 160 , the outer side of the second sealing member 160 is sealedly connected to the housing 110 , and the inner side of the second sealing member 160 is sealedly connected to the output gear assembly 131 via the annular protrusion 105 .

[0115] As for the third sealing member 170 , the outer side of the third sealing member 170 is sealedly connected to the housing 110 , and the annular protrusion 105 of the third sealing member 170 is sealedly connected to the transmission shaft 180 .

[0116] The annular protrusion 105 can be closely fitted to the transmission shaft 180 or the output gear assembly 131 that needs to be sealed to form a closed environment. This lip sealing method can effectively ensure a waterproof effect.

[0117] It is understandable that the number of the annular protrusions 105 can also be one, three or more. When there are at least two annular protrusions 105, the multiple annular protrusions 105 are spaced apart along the axial direction of the seal. The multiple annular protrusions 105 are sealed and connected to the transmission shaft 180 or the output gear assembly 131 to improve the sealing effect.

[0118] In the embodiment of the present disclosure, the first seal 150 , the second seal 160 , the third seal 170 , the transmission shaft 180 and the output gear assembly 131 are coaxially distributed. Therefore, the plurality of annular protrusions 105 can also be considered to be distributed at intervals along the axial direction of the transmission shaft 180 .

[0119] like Figures 4 to 6 As shown, in the embodiment shown in the present disclosure, the number of the annular protrusions 105 is two, and the two annular protrusions 105 are respectively a first protrusion 103 and a second protrusion 104 .

[0120] The second protrusion 104 of the first sealing member 150 and the second protrusion 104 of the second sealing member 160 are both located between the first protrusion 103 and the second side of the housing 110, and the second protrusion 104 of the third sealing member 170 is located between the first protrusion 103 and the first side of the housing 110. In other words, the second protrusion 104 is located closer to the inner side of the accommodation space 101, and the first protrusion 103 is located closer to the corresponding outlet hole (referring to the first avoidance hole 1121, the second avoidance hole 102 or the shaft hole 1311), and is farther from the outer side of the accommodation space 101.

[0121] The inner diameter of the first protrusion 103 is greater than the inner diameter of the second protrusion 104. The different inner diameters indicate that the interference between different annular protrusions 105 and the transmission shaft 180 or the output gear assembly 131 is different. It can be understood that the smaller the inner diameter of the annular protrusion 105, the larger the corresponding interference; conversely, the larger the inner diameter of the annular protrusion 105, the smaller the corresponding interference.

[0122] The second protrusion 104 with a larger interference has a better sealing effect, while the first protrusion 103 with a smaller interference can reduce the friction between the seal and the transmission shaft 180 or the output gear assembly 131, and will not cause the seal to lose its sealing function too quickly due to the large friction resistance, thereby prolonging the sealing effect of the seal.

[0123] For example, Figure 6As shown, the outer diameter L3 of the first seal 150 is φ28-28.3mm, or 28-28.015mm, for example, the outer diameter of the first seal 150 is 28mm, 28+0.3mm or 28+0.15mm. The inner diameter L1 of the first protrusion 103 in the first seal 150 is: φ20.3-20.7mm, the inner diameter L2 of the second protrusion 104 in the first seal 150 is: φ21.0-21.4mm, and the height H of the first seal 150 along the axial direction of the transmission shaft 180 is 3.8-4.2mm.

[0124] The outer diameter of the second seal 160 is φ56-56.2mm, or φ56-56.35mm, for example, the outer diameter of the second seal 160 is 56mm, 56+0.35mm or 56+0.2mm. The inner diameter of the first protrusion 103 in the second seal 160 is φ46.7-47.3mm, or φ46.8-47.2mm; the inner diameter of the second protrusion 104 in the second seal 160 is 47.4-47.8mm. The height of the second seal 160 along the axial direction of the transmission shaft 180 is 3.8-4.2mm.

[0125] The size of the third seal 170 is the same as that of the first seal 150 . That is, the outer diameter of the third seal 170 , the size of the two annular protrusions 105 in the third seal 170 , and the height of the third seal 170 are all the same as those of the first seal 150 .

[0126] like Figure 1 , Figure 7 and Figure 8 As shown, the housing 110 includes: a first housing 112 and a second housing 111 . The second sealing member 160 is installed on the first housing 112 ; the second housing 111 and the first housing 112 together form a receiving space 101 , and the third sealing member 170 is installed on the second housing 111 .

[0127] Optionally, the mid-mounted motor of the embodiment of the present disclosure further includes: a housing seal, which is located between the first housing 112 and the second housing 111 to form a liquid seal at the connection between the first housing 112 and the second housing 111 .

[0128] In the embodiment shown in the present disclosure, the first shell 112 and / or the second shell 111 has a storage groove 1122 ; the shell seal is located in the storage groove 1122 to form a liquid seal at the connection between the first shell 112 and the second shell 111 .

[0129] The sealing effect of the housing seal combined with the first seal, the second seal and the third seal can further improve the waterproof performance of the mid-mounted motor, so that the mid-mounted motor can be used in water for a long time without water ingress, and can be applied to water-assisted vehicles. Figure 7 As shown, the shell seal is a sealant, which refers to: a liquid or semi-solid colloid added to the storage groove 1122 by any means such as coating, spraying, filling, etc., and the colloid forms a sealant after solidification. This sealant not only has a liquid sealing effect, but also can connect the first shell 112 and the second shell 111.

[0130] It is understandable that the housing seal may also include a sealing strip, which generally refers to a solid structure with a sealing function, such as a rubber or silicone sealing ring.

[0131] Regardless of whether the housing seal has the function of connecting the first housing 112 and the second housing 111, the first housing 112 and the second housing 111 may be connected by at least one of the following connection methods: connection with fasteners such as screws or bolts, bonding or clamping, etc. It is understandable that if the housing seal has the function of connecting the first housing 112 and the second housing 111, other additional methods may not be used to connect the first housing 112 and the second housing 111.

[0132] In an embodiment not shown in the present disclosure, the storage slot 1122 may also be located in the second shell 111 , or the first shell 112 and the second shell 111 may both have the storage slot 1122 at corresponding positions.

[0133] Before assembling the first shell 112 and the second shell 111, sealant can be applied to the storage groove 1122, and then the two shells are covered. The sealing effect of the sealant can be used to limit the liquid in the external environment from entering the accommodating space 101 through the connection between the first shell 112 and the second shell 111, thereby further improving the waterproof effect of the central motor.

[0134] According to some optional embodiments, Figure 8 As shown, the housing 110 has a through hole 1112 communicating with the accommodation space 101. Figure 8 As shown by way of example, the via hole 1112 is located in the second housing 111 .

[0135] like Figure 1 As shown, the central motor also includes: a power interface 190 ( Figure 1 As shown in FIG. 1 ), a male terminal mounting position 1113 distributed around the through hole 1112 and a female terminal mounting position 1114 distributed around the male terminal mounting position 1113 (as shown in FIG. 1 ). Figure 8 As shown in Fig.10As shown, the power interface 190 includes: a male end connector 191 installed on the male end mounting position 1113, and a female end connector 192 that can be connected to the female end mounting position 1114, and the female end connector 192 is detachably connected to the male end connector 191; the male end connector 191 has a first conductive member 1913, and the female end connector 192 has a second conductive member 1923. When the female end connector 192 is connected to the male end connector 191, the first conductive member 1913 and the second conductive member 1923 are electrically connected to supply power to the central motor.

[0136] The female mounting position 1114 surrounds the male mounting position 1113, so that when the female connector 192 is connected to the male connector 191, the liquid outside the female connector 192 will first pass through the female mounting position 1114 before entering the male mounting position 1113, that is to say: the connection between the female connector 192 and the female mounting position 1114 has a protective effect on the internal male connector 191, which can reduce the risk of the male connector 191 getting damp.

[0137] In some embodiments, the mid-mounted motor further includes: a male end seal 193 and a female end seal 194. Fig.11 As shown, the male end seal 193 is located between the male end installation position 1113 and the male end connector 191 to form a liquid seal at the connection between the male end installation position 1113 and the male end connector 191; the female end seal 194 is located between the female end installation position 1114 and the female end connector 192 to form a liquid seal at the connection between the female end installation position 1114 and the female end connector 192. The use of the male end seal 193 and the female end seal 194 further improves the sealing at the power interface 190. This sealing effect not only effectively ensures the safety of electricity use, but also limits the liquid in the external environment from entering the accommodation space 101 through the power interface 190 and affecting the electronic components inside the mid-mounted motor.

[0138] The male end mounting position 1113 and the female end mounting position 1114 may both be mounting planes. Figure 8 As shown, the female end mounting position 1114 is located above the male end mounting position 1113 and surrounds the male end mounting position 1113 .

[0139] Exemplarily, the male end seal 193 is a gasket independent of the male end connector 191, and the male end seal 193 can be sleeved on the male end connector 191 by means of interference fit. Similarly, the female end seal 194 is a gasket independent of the female end connector 192, and the female end seal 194 can be sleeved on the female end connector 192 by means of interference fit.

[0140] In an embodiment not shown in the present disclosure, the male end seal 193 can also be formed on the male end connector 191 by injection molding or the like, so that the male end seal 193 and the male end connector 191 are inseparable integral parts. Similarly, the female end seal 194 can also be formed on the female end connector 192 by injection molding or the like, so that the female end seal 194 and the female end connector 192 are inseparable integral parts.

[0141] Without limitation, the material of the male seal 193 and the female seal 194 is silicone. The male connector 191 is used to achieve electrical connection and / or signal connection with the electronic components inside the mid-mounted motor, and the female connector 192 is used to connect to the power supply outside the mid-mounted motor to power the electronic components. The electronic components include but are not limited to the motor assembly 120 and the torque sensor assembly 140.

[0142] like Figures 9 to 11 As shown, according to some optional embodiments, the power interface 190 further includes: a fourth seal 199, which is located between the male connector 191 and the female connector 192 to form a liquid seal at the connection between the male connector 191 and the female connector 192. The fourth seal 199 can further improve the sealing effect at the power interface 190.

[0143] The fourth sealing member 199 may be a sealing ring. Figure 6 The seals shown may be of the same or different construction.

[0144] The material of the fourth sealing member 199 may be silicone, but is not limited thereto.

[0145] like Fig.10 and Fig.11 As shown, after the male connector 191 and the female connector 192 are connected, the fourth seal 199 is located inside the female seal 194, which can play a secondary sealing role for the first conductive member 1913 and the second conductive member 1923. At the same time, the fourth seal 199 can also strengthen the friction between the male connector 191 and the female connector 192, thereby improving the reliability of the connection between the two.

[0146] like Fig.10 As shown, according to some optional embodiments, the male end connector 191 includes: a male end body 1911 and a male end flange 1912 distributed around the male end body 1911, and a first conductive member 1913 is located at the male end body 1911; the male end body 1911 is partially inserted into the through hole 1112, and the fourth sealing member 199 is sleeved on the outside of the male end body 1911; the male end seal 193 is located between the male end mounting position 1113 and the male end flange 1912.

[0147] The male end flange 1912 can serve as a carrier for connecting the male end connector 191 to the housing 110 , and can also carry the male end seal 193 .

[0148] The female end connector 192 includes a female end body 1922 and a female end flange 1921 distributed around the female end body 1922; the second conductive member 1923 is located on the female end body 1922; the female end body 1922 is sleeved on the outside of the male end body 1911, the fourth sealing member 199 is located between the male end body 1911 and the female end body 1922, and the female end sealing member 194 is sleeved on the outside of the female end body 1922 and is located between the female end mounting position 1114 and the female end flange 1921.

[0149] Likewise, the female end flange 1921 can serve as a carrier for connecting the female end connector 192 to the housing 110 , and can also carry the female end seal 194 .

[0150] Both the male end body 1911 and the female end body 1922 may be substantially cylindrical.

[0151] like Fig.10 As shown, according to some optional embodiments, the mid-mounted motor also includes: a first plug fastener 197 and a second plug fastener 198, the first plug fastener 197 passes through the male end flange 1912 and the male end mounting position 1113 respectively to connect the male end connector 191 and the housing 110; the second plug fastener 198 passes through the female end flange 1921 and the female end mounting position 1114 respectively to connect the female end connector 192 and the male end connector 191 and the housing 110.

[0152] The first plug fastener 197 includes a screw or a bolt, and the second plug fastener 198 includes a screw or a bolt, but is not limited thereto.

[0153] like Figure 8 and Fig.10 As shown, a first mounting hole 195 is respectively provided on the male end mounting position 1113 and the male end flange 1912, and a first plug fastener 197 is respectively inserted into the first mounting hole 195 corresponding to the male end mounting position 1113 and the male end flange 1912 to fix the male end connector 191 to the housing 110, and such fixation may be a threaded fixation method, but is not limited to this.

[0154] It is understood that the first plug fastener 197 is inserted into the first mounting hole 195 (eg, Figure 8 After the first plug fastener 197 is inserted into the second mounting hole 196, the first plug fastener 197 fixes and squeezes the male end seal 193 to ensure the liquid sealing function at the first plug fastener 197. Similarly, after the second plug fastener 198 is inserted into the second mounting hole 196, it squeezes the female end seal 194 to achieve the liquid sealing of the female end seal 194 at the second plug fastener 198.

[0155] According to some optional embodiments, the first conductive member 1913 includes: a power terminal 1914 and a signal terminal 1915. The first conductive member 1913 can be connected to the circuit board inside the mid-mounted motor through the line passing through the via 1112 to supply power or transmit signals to the electronic devices in the mid-mounted motor.

[0156] like Fig.10 As shown, there are two power terminals 1914, namely a positive terminal and a negative terminal. Fig.10 The pin-type power terminal 1914 and the pin-type signal terminal 1915 are shown as examples. Since the positive pin and the negative pin have large overcurrent, in order to reduce the influence of the large current pins and the signal line, as shown in FIG. Fig.10 As shown, the positive terminal is located in the first receiving groove 1901 of the male body 1911, and the negative terminal is located in the second receiving groove 1902 of the male body 1911. The first receiving groove 1901 and the second receiving groove 1902 are not connected, and only one side facing the female end connector has an opening. This structure can use the groove wall of the first receiving groove 1901 and the groove wall of the second receiving groove 1902 to form an isolation structure to isolate the positive terminal from the negative terminal.

[0157] There are multiple signal terminals 1915 , and the specific number can be set as needed. For example, the signal terminals 1915 can be 8, 10, 11 or other numbers.

[0158] The power interface 190 of the embodiment of the present disclosure integrates the power terminal 1914 and the signal terminal 1915 , and there is no need to set up an additional signal interface, which reduces the number of ports and helps to reduce the waterproofing cost.

[0159] According to some optional embodiments, the intermediate transmission structure is an at least two-stage transmission structure, wherein the output gear assembly 131 is a gear of a final-stage transmission structure in the at least two-stage transmission structure.

[0160] like Fig.12 As shown, the transmission assembly 130 is a three-stage transmission structure, and the three-stage transmission structures are all driven components driven by the driving force of the motor assembly 120. Among them, the primary transmission structure is connected to the motor assembly 120 and the secondary transmission structure respectively, and the secondary transmission structure is connected to the tertiary transmission structure. The primary transmission structure transmits the driving force of the motor assembly 120 to the secondary transmission structure, and the secondary transmission structure then transmits the driving force to the output gear assembly 131 in the tertiary transmission structure, and the output gear assembly 131 then drives the transmission shaft 180 to output the driving force.

[0161] In embodiments not shown in the present disclosure, the transmission assembly 130 may also be a primary transmission structure, a secondary transmission structure, a quaternary transmission structure or a transmission structure of more than one stage. The output gear assembly 131 is a gear assembly in the final transmission structure of the transmission assembly 130 .

[0162] The motor assembly 120 includes a stator assembly 121, a rotor assembly 122 and an output shaft 123, and the output shaft 123 is connected to the transmission assembly 130. The stator assembly 121 and the rotor assembly 122 drive the output shaft 123 to rotate based on the principle of electromagnetic induction, and the output shaft 123 can be connected to the transmission assembly 130 in a meshing manner to drive the transmission assembly 130 to rotate.

[0163] According to some optional embodiments, Figure 4 As shown, the output gear assembly 131 includes an output gear 1313 and a sleeve 1312 , the sleeve 1312 is sleeved on the outside of the output gear 1313 , the second seal 160 is sealedly connected to the sleeve 1312 , and the transmission shaft 180 is connected to the output gear 1313 .

[0164] The shaft sleeve 1312 is located on the gear shaft of the output gear 1313, and protects the rotation of the output gear 1313, thereby extending the service life of the gear.

[0165] The disclosed embodiment also provides a water-assisted vehicle, which includes a frame and the mid-mounted motor described in the above embodiment, wherein the mid-mounted motor is mounted on the frame.

[0166] Under the premise of no conflict, different embodiments or different technical features of the present disclosure can be arbitrarily combined to form new embodiments.

[0167] It should be understood that the above embodiments are exemplary and are not intended to include all possible implementations included in the claims. Various modifications and changes may be made on the basis of the above embodiments without departing from the scope of the present disclosure. Similarly, the various technical features of the above embodiments may be arbitrarily combined to form other embodiments of the present invention that may not be explicitly described. Therefore, the above embodiments only express several implementations of the present invention and do not limit the scope of protection of the patent of the present invention.

Claims

1. A mid-mounted motor for a water-assisted vehicle, characterized in that: The mid-mounted motor comprises: A housing (110) comprising a first shell (112) and a second shell (111), wherein the second shell (111) and the first shell (112) together form a receiving space (101); A motor assembly (120) for providing driving force; the motor assembly (120) is located in the accommodating space (101); The transmission assembly (130) comprises: an output gear assembly (131), wherein the output gear assembly (131) is configured to: connect to a crankset in the water-assisted vehicle and drive the crankset to rotate under the action of a driving force generated by the motor assembly (120); a portion of the output gear assembly (131) is located in the accommodating space (101), and another portion of the output gear assembly (131) is located outside the accommodating space (101); A transmission shaft (180) is arranged through the axis of the output gear assembly (131) and penetrates the housing (110); two ends of the transmission shaft (180) extending out of the housing (110) are respectively connected to two foot pedal assemblies of the water-assisted vehicle; the transmission shaft (180) is configured to rotate under the action of the rotating foot pedal assembly; A first sealing member (150) is located on a first side of the housing (110) and is sealingly connected to the output gear assembly (131) and the transmission shaft (180) respectively, so as to form a liquid seal at the connection between the transmission shaft (180) and the output gear assembly (131); a second sealing member (160) located on a first side of the housing (110) and sealingly connected to the output gear assembly (131) and the housing (110) respectively, so as to form a liquid seal at a connection between the output gear assembly (131) and the first side of the housing (110); a third sealing member (170) located on a second side of the housing (110) and sealedly connected to the housing (110) and the transmission shaft (180) respectively, so as to form a liquid seal at a connection between the transmission shaft (180) and the second side of the housing (110); wherein the second side is an opposite side to the first side; A shell seal, wherein the first shell (112) and / or the second shell (111) has a storage groove (1122); the shell seal is located in the storage groove (1122) to form a liquid seal at the connection between the first shell (112) and the second shell (111).

2. The mid-mounted motor according to claim 1, characterized in that: The housing seal comprises a sealant or a sealing strip arranged in the storage groove (1122).

3. The mid-mounted motor according to claim 1, characterized in that: The output gear assembly (131) has a shaft hole (1311) for the transmission shaft (180) to pass through; The first sealing component (150) is a sealing ring; the first sealing component (150) is located in the shaft hole (1311) and is interference fit with the hole wall of the shaft hole (1311).

4. The mid-mounted motor according to claim 1 or 3, characterized in that: The first sealing component (150) is interference-fitted with the transmission shaft (180).

5. The mid-mounted motor according to claim 1, characterized in that: The housing (110) has a first avoidance hole (1121) for the output gear assembly (131) to pass through, and the second sealing member (160) is a sealing ring; the second sealing member (160) is located in the first avoidance hole (1121) and is interference-fitted with a hole wall of the first avoidance hole (1121).

6. The mid-mounted motor according to claim 1 or 5, characterized in that: The second sealing member (160) is interference-fitted with the output gear assembly (131).

7. The mid-mounted motor according to claim 1, characterized in that: The housing (110) has a second avoidance hole (102) for the transmission shaft (180) to pass through, and the third sealing member (170) is a sealing ring; the third sealing member (170) is located in the second avoidance hole (102) and is interference-fitted with a hole wall of the second avoidance hole (102).

8. The mid-mounted motor according to claim 1 or 7, characterized in that: The third sealing component (170) is interference-fitted with the transmission shaft (180).

9. The mid-mounted motor according to claim 1 or 3 or 5 or 7, characterized in that: At least one of the first seal (150), the second seal (160) and the third seal (170) comprises: an annular body and an annular protrusion (105), wherein the annular protrusion (105) is located inside the annular body and protrudes toward the center of the annular body, and the number of the annular protrusion (105) is at least one; The annular protrusion (105) of the first sealing member (150) and the annular protrusion (105) of the third sealing member (170) are both sealedly connected to the transmission shaft (180); The annular protrusion (105) of the second sealing member (160) is sealingly connected to the output gear assembly (131).

10. The mid-mounted motor according to claim 9, characterized in that: The number of the annular protrusions (105) is two, and the two annular protrusions (105) are respectively a first protrusion (103) and a second protrusion (104), and are spaced apart and distributed along the axial direction of the transmission shaft (180); The second protrusion (104) of the first sealing member (150) is located between the first protrusion (103) of the first sealing member (150) and the second side of the housing (110); the second protrusion (104) of the second sealing member (160) is located between the first protrusion (103) of the second sealing member (160) and the second side of the housing (110); the second protrusion (104) of the third sealing member (170) is located between the first protrusion (103) of the third sealing member (170) and the first side of the housing (110); The inner diameter of the first protrusion (103) is greater than the inner diameter of the second protrusion (104).

11. The mid-mounted motor according to claim 10, characterized in that: The outer diameter of the first sealing member (150) is 28-28.3 mm, or 28-28.015 mm; the inner diameter of the first protrusion (103) in the first sealing member (150) is 20.3-20.7 mm, or 20.6-21 mm; the inner diameter of the second protrusion (104) in the first sealing member (150) is 21.0-21.4 mm; The outer diameter of the second sealing member (160) is 56-56.2 mm, or 56-56.35 mm; the inner diameter of the first protrusion (103) in the second sealing member (160) is 46.7-47.3 mm, or 46.8-47.2 mm; the inner diameter of the second protrusion (104) in the second sealing member (160) is 47.4-47.8 mm; The heights of the first sealing member (150) and the second sealing member (160) along the axial direction of the transmission shaft (180) are both 3.8-4.2 mm; The size of the third sealing member (170) is the same as the size of the first sealing member (150).

12. The mid-mounted motor according to claim 1 or 2 or 3 or 5 or 7, characterized in that: The third sealing member (170) is mounted on the second shell (111).

13. The mid-mounted motor according to claim 1 or 2 or 3 or 5 or 7, characterized in that: The housing (110) has a through hole (1112), and the central motor further comprises: a power interface (190) corresponding to the position of the through hole (1112), a male end mounting position (1113) distributed around the through hole (1112), and a female end mounting position (1114) distributed around the male end mounting position (1113); The power interface (190) comprises: a male end connector (191) mounted on the male end mounting position (1113), and a female end connector (192) capable of being connected to the female end mounting position (1114), wherein the female end connector (192) is detachably connected to the male end connector (191); The male end connector (191) has a first conductive member (1913), and the female end connector (192) has a second conductive member (1923); when the female end connector (192) is connected to the male end connector (191), the first conductive member (1913) and the second conductive member (1923) are electrically connected to supply power to the central motor.

14. The mid-mounted motor according to claim 13, characterized in that: The mid-mounted motor further comprises: a male end seal (193) and a female end seal (194); The male end sealing member (193) is located between the male end mounting position (1113) and the male end connector (191) to form a liquid seal at the connection between the male end mounting position (1113) and the male end connector (191); The female end seal (194) is located between the female end mounting position (1114) and the female end connector (192) to form a liquid seal at the connection between the female end mounting position (1114) and the female end connector (192).

15. The mid-mounted motor according to claim 14, characterized in that: The power interface (190) further comprises: a fourth sealing member (199), wherein the fourth sealing member (199) is located between the male end connector (191) and the female end connector (192) so as to form a liquid seal at the connection between the male end connector (191) and the female end connector (192).

16. The mid-mounted motor according to claim 15, characterized in that: The male end connector (191) comprises: a male end body (1911) and a male end flange (1912) distributed around the male end body (1911), and the first conductive member (1913) is located on the male end body (1911); The male end body (1911) is partially inserted into the through hole (1112), and the fourth sealing member (199) is sleeved outside the male end body (1911); the male end sealing member (193) is located between the male end mounting position (1113) and the male end flange (1912); The female end connector (192) comprises a female end body (1922) and a female end flange (1921) distributed around the female end body (1922); the second conductive member (1923) is located on the female end body (1922); The female end body (1922) is sleeved on the outside of the male end body (1911), the fourth sealing member (199) is located between the male end body (1911) and the female end body (1922), and the female end sealing member (194) is sleeved on the outside of the female end body (1922) and is located between the female end mounting position (1114) and the female end flange (1921).

17. The mid-mounted motor according to claim 16, characterized in that: The central motor further comprises: a first plug fastener (197) and a second plug fastener (198); the first plug fastener (197) respectively passes through the male end flange (1912) and the male end mounting position (1113) to connect the male end connector (191) and the housing (110); The second plug fastener (198) passes through the female end flange (1921) and the female end mounting position (1114) respectively to connect the female end connector (192) and the housing (110).

18. The mid-mounted motor according to claim 13, characterized in that: The first conductive member (1913) includes: a power terminal (1914) and a signal terminal (1915).

19. The mid-mounted motor according to claim 1, characterized in that: The transmission assembly (130) comprises at least one stage of transmission structure, wherein the output gear assembly (131) is a gear assembly of the final stage of transmission structure in the transmission assembly (130).

20. The mid-mounted motor according to claim 1 or 19, characterized in that: The output gear assembly (131) comprises an output gear (1313) and a shaft sleeve (1312), the shaft sleeve (1312) being sleeved outside the output gear (1313), the second sealing member (160) being sealingly connected to the shaft sleeve (1312), and the transmission shaft (180) being connected to the output gear (1313).

21. A water-assisted vehicle, characterized in that: The water-assisted vehicle comprises: Frame; The mid-mounted motor of the water-assisted vehicle according to any one of claims 1 to 20, wherein the mid-mounted motor is mounted on the frame.

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