Direct connection motor and gearbox integrated device

Abstract

The utility model relates to the technical field of integrated devices, and discloses a direct connection motor and gearbox integrated device, which comprises a motor assembly and a gearbox assembly, the motor assembly comprises a motor casing, a front end cover, a motor shaft, an open bearing arranged in the motor shaft, an oil collecting ring, an oil seal, a gap groove ring, a shaft retainer ring and a bearing pressing plate, the oil seal is assembled on the front end cover in an interference manner and is positioned in front of the oil collecting ring; the open type bearing is assembled on the front end cover in a clearance mode and is reinforced by the bearing pressing plate, the shaft check ring limits axial movement, and the gap groove ring assists sealing of the oil seal. According to the sealing design, the oil seal is assembled on the front end cover of the motor in an interference fit mode to form first sealing, most of working oil liquid in a gearbox is effectively blocked, second sealing is formed by combining the small gap design between the gap groove ring and the motor shaft, oil liquid leakage is further prevented, and when the second sealing fails, oil liquid leakage is prevented. Oil liquid is thrown onto the oil collecting ring under rotation of the motor shaft, flows into the first oil collecting cavity and flows to the position above the plug screw through the oil channel, and the influence of oil liquid accumulation on performance is avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to the integrated device technical field, especially relates to a direct connection motor and gearbox integrated device. BACKGROUND

[0002] In recent years, with the active promotion of the national energy strategy and energy-saving emission reduction policy, electric drive technology has made significant progress in the field of small commercial logistics vehicles. Among them, the rear drive axle type transmission system has become the mainstream technical scheme in this field. The motor is the core power source of the rear drive axle type transmission system, which is responsible for converting electrical energy into mechanical energy to drive the vehicle. In the rear drive axle type transmission system, the motor and the gearbox are designed in an integrated manner, and the motor and the gearbox are connected through a flange, and the motor output shaft directly extends into the gearbox. Since the gearbox needs oil during operation, and the motor output shaft is in communication with the inside of the gearbox, the oil may seep into the motor through the gap between the output shaft and the flange when the oil is used for a long time, resulting in a decrease in motor performance or even failure. To prevent oil leakage, a skeleton oil seal is usually provided between the flange and the output shaft for sealing.

[0003] Currently, there are several solutions on the market to prevent oil in the gearbox from entering the motor, such as Figure 1 A typical motor assembly integrated machine is provided, which includes 1, motor housing, 2, motor shaft, 3, motor front bearing, 4, oil seal 1, 5, oil seal 2, 6, gearbox adapter shaft, 7, gearbox housing, 8, gearbox front bearing, 9, plug, 10, flow channel. The scheme is to assemble a bearing in front of the motor front bearing, and assemble oil seal 1 and oil seal 2 behind the gearbox front bearing, and oil seal 1 and oil seal 2 form an oil storage cavity, the oil storage cavity is in communication with the oil return channel, and the oil return channel is provided with an opening on the side facing the gearbox, and a one-way valve is installed on the opening to return the gear oil through the one-way valve when the oil seal fails. The scheme adds oil seal 2 to the motor input shaft to seal the motor input shaft, and sets up an oil return channel with a one-way valve to solve the problem of gear oil entering the motor assembly cavity in the gearbox assembly when the oil seal fails, increasing safety. However, the structure of this scheme is relatively complex, which will increase the size and weight of the whole machine, and the integration is low.

[0004] For example Figure 2 A coaxial electric drive axle sealing structure scheme is provided, Figure 2The scheme provides a motor shell 1, a bearing 2, an oil seal 3, and a motor shaft 4. The oil seal is arranged behind the front bearing of the motor. During operation, the oil in the gearbox can lubricate the front bearing of the motor. The sealing structure is arranged inside the gearbox shell, and the transmission system structure is more compact. However, the fixed particles generated during the operation of the gearbox can be suspended in the oil, causing wear on the lip of the oil seal. In severe cases, grooves can be formed on the surface of the rotating shaft, increasing the risk of oil leakage. Therefore, the device provided by the scheme is prone to oil leakage after a long time of work or improper assembly of the oil seal.

[0005] For example Figure 3 The typical gearbox direct-drive motor sealing scheme provided by the scheme is shown in the partial structure of Figure 3 The scheme provides a motor shell 1, a bearing 2, an oil seal 3, and a motor shaft 4. The oil seal is arranged behind the front bearing of the motor. During operation, the oil in the gearbox can lubricate the front bearing of the motor. The sealing structure is arranged inside the gearbox shell, and the transmission system structure is more compact. However, the fixed particles generated during the operation of the gearbox can be suspended in the oil, causing wear on the lip of the oil seal. In severe cases, grooves can be formed on the surface of the rotating shaft, increasing the risk of oil leakage. Therefore, the device provided by the scheme is prone to oil leakage after a long time of work or improper assembly of the oil seal. Figure 2 The scheme works in the same way as the scheme provided by the scheme. The lip of the oil seal is prone to wear, and the oil seal is prone to oil leakage. The oil can greatly reduce the service life of the front bearing of the motor, causing the bearing to be damaged and leading to motor boreout failure.

[0006] Therefore, the existing motor and gearbox oil sealing structure still has many problems. Due to the use of single sealing design, the sealing reliability is insufficient, and it is easy to fail under long-term operation or extreme working conditions, causing oil leakage and affecting equipment operation. The solid particles generated during the operation of the gearbox can be suspended in the oil, causing wear on the lip of the skeleton oil seal, and even forming grooves on the surface of the rotating shaft, increasing the risk of leakage. The leakage of oil into the motor can cause motor failure, and the repair of the rotating shaft after wear is difficult and costly, usually requiring replacement of the rotating shaft or the entire motor, increasing maintenance costs and causing resource waste. In addition, after the oil leaks, the motor or gearbox needs to be disassembled for cleaning and maintenance, which is time-consuming and tedious. The leaked oil may contaminate the inside of the motor, affecting its performance and even damaging it. The existing design does not fully consider the collection and treatment of oil leakage, resulting in oil spillage, causing environmental pollution and waste. In some designs, the motor bearing and gearbox bearing are separated, and the motor bearing cannot be lubricated by the gearbox oil, which shortens the service life of the bearing and increases the additional lubrication requirement. Invention content

[0007] In order to solve the problems of insufficient reliability, easy wear, complex maintenance, contamination of the motor, lack of oil recovery mechanism, and insufficient bearing lubrication in the existing motor and gearbox sealing structure, the utility model provides a direct-drive motor and gearbox integrated device.

[0008] The technical scheme of the utility model is as follows:

[0009] The utility model relates to a kind of direct-connected motor and gearbox integrated device, including motor assembly and gearbox assembly, the motor assembly includes motor shell, motor front end cover connected with the motor shell and motor shaft, the gearbox assembly includes gearbox shell, the motor shaft is connected with gearbox shell through motor front end cover,

[0010] The motor assembly is internally provided with open bearing, oil collecting ring, gap groove ring, oil seal, shaft baffle and bearing pressing plate, the oil collecting ring is assembled on the motor front end cover, gap groove ring is provided on the end of the motor front end cover close to the oil collecting ring,

[0011] The oil seal is assembled on the motor front end cover by interference fit, the oil seal is located in front of the oil collecting ring, the oil seal is provided on the outside of the motor shaft by interference fit, and the gap groove ring is located between the oil collecting ring and the oil seal,

[0012] The open bearing is assembled on the motor front end cover by gap fit, the open bearing is located in front of the oil seal, and the open bearing is reinforced by the bearing pressing plate,

[0013] The shaft baffle is provided in front of the open bearing to limit the axial movement of the open bearing.

[0014] Further, a sealing ring is assembled between the oil collecting ring and the motor front end cover.

[0015] Further, a first oil collecting cavity is formed between the oil collecting ring and the motor front end cover.

[0016] Further, an oil channel and a plug screw are provided on the bottom side of the motor front end cover, the plug screw is provided at the outlet of the oil channel, and the end of the oil channel away from the plug screw is connected with the first oil collecting cavity.

[0017] Further, a second oil collecting cavity is provided in the gearbox shell.

[0018] Further, an oil inlet hole and two oil outlets are provided on the open bearing.

[0019] Further, a sun gear is provided in the gearbox shell, and the sun gear is connected with the motor shaft.

[0020] The utility model has at least the following beneficial effects:

[0021] 1. The oil seal is assembled on the motor front end cover by interference fit to form a first resealing, effectively blocking most of the working oil in the second oil collecting cavity in the gearbox, preventing oil leakage, and further preventing oil leakage by combining the small gap between the gap groove ring and the motor shaft to form a second resealing as a supplemental sealing, further ensuring excellent sealing effect under long-term operation or extreme working conditions.

[0022] 2. Through the oil inlet hole and two oil outlets on the motor front end cover, the oil circulation is realized, the oil in the gearbox enters through the oil inlet hole to provide lubrication for the open bearing, and then flows out through the two oil outlets, forming an effective lubrication cycle.

[0023] 3. When the second heavy seal cannot withstand a large amount of oil, the oil will be thrown onto the oil collecting ring under the rotation of the motor shaft, and will flow into the first oil collecting cavity under the action of gravity, and then flow to the top of the plug screw through the oil channel, so that the maintenance of the motor is more convenient and simple, and the accumulation of oil has no adverse effect on the performance of the motor. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 A cross-sectional structure schematic view of a typical motor assembly all-in-one machine provided by the present application.

[0025] Figure 2 A cross-sectional structure schematic view of a coaxial electric drive bridge sealing structure provided by the present application.

[0026] Figure 3 A partial cross-sectional structure schematic view of a typical gearbox direct connection motor sealing structure provided by the present application.

[0027] Figure 4 A cross-sectional structure schematic view of a direct connection motor and gearbox integrated device provided by the present application.

[0028] Figure 5 A motor shaft forward view structure schematic view of a direct connection motor and gearbox integrated device provided by the present application.

[0029] Figure 6 An A partial enlarged schematic view of a direct connection motor and gearbox integrated device provided by the present application.

[0030] Among them, the structure diagram of the direct connection motor and gearbox integrated device provided by the present application comprises:

[0031] 1-motor front end cover;2-open bearing;3-oil collecting ring;4-oil seal;5-gap groove ring;6-motor shaft;7-shaft retainer;8-first oil collecting cavity;9-sealing ring;10-bearing pressing plate;11-second oil collecting cavity;12-motor casing;13-gearbox casing;14-sun gear;15-oil inlet hole;16-oil outlet;17-oil channel;18-plug screw. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical scheme and advantages of the utility model embodiment clearer, the technical scheme in the utility model embodiment will be clearly and completely described below in combination with the drawings in the utility model embodiment. Obviously, the described embodiments are part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the person skilled in the art without creative labor belong to the protection scope of the utility model.

[0033] In combination with Figures 4-6 The utility model provides a kind of direct coupling motor and gearbox integrated device, including motor assembly and gearbox assembly, the motor assembly includes motor casing 12, and the motor front end cover 1 of being connected with the motor casing 12 and motor shaft 6, the gearbox assembly includes gearbox casing 13, the motor shaft 6 is connected with gearbox casing 13 through motor front end cover 1, the motor front end cover 1 is located at the front end of motor casing 12, and motor front end cover 1 is connected with motor casing 12 to form a containing space, provide protection for internal components and be connected with gearbox casing 13 as interface,

[0034] The motor assembly is internally provided with open bearing 2, oil ring 3, gap groove ring 5, oil seal 4, shaft baffle 7 and bearing pressing plate 10,

[0035] The motor front end cover 1 is assembled with oil ring 3, the oil ring 3 is arranged around the motor shaft 6, and the motor front end cover 1 is provided with gap groove ring 5 on one end close to the oil ring 3, as shown in Figure 6 The gap groove ring 5 is arranged around the motor shaft 6, and the gap groove ring 5 and the motor shaft 6 form a small gap, and grease can be added in the gap groove ring 5, and then the throttling effect of the throttling groove is used for dust prevention and leakage prevention. This setting is suitable for the outer sealing of grease lubrication in dry and clean environment,

[0036] The oil seal 4 is assembled on the motor front end cover 1 by interference fit, and forms a tight sealing structure with the motor front end cover 1. The oil seal 4 is arranged around the motor shaft 6, which can effectively prevent the oil in the second oil collecting cavity 11 from leaking into the motor from the outer ring of the oil seal 4 when the gearbox is working. The oil seal 4 is located in front of the oil ring 3. The motor shaft 6 is a rotating part, and the oil seal 4 is arranged around the motor shaft 6. The lip of the oil seal 4 is interference fitted on the outer ring of the motor shaft 6, so that the motor shaft 6 can always be sealed during rotation to prevent oil leakage. The gap groove ring 5 is located between the oil ring 3 and the oil seal 4,

[0037] The open bearing 2 is assembled to the motor front end cover 1 by gap fit, after assembly, part structure of the open bearing 2 exceeds the assembly surface of the bearing pressing plate 10, the open bearing 2 is reinforced to the motor front end cover 1 by the bearing pressing plate 10, the bearing pressing plate 10 is compressed by screw fastening to compress the open bearing 2 and press it in the proper position, ensure that the open bearing 2 does not occur the phenomenon of running out of circle when working, and then prolong its service life, the open bearing 2 is located in front of the oil seal 4,

[0038] The shaft baffle 7 is arranged in front of the open bearing 2, for limiting the axial movement of the open bearing 2, preventing the axial movement of the open bearing 2.

[0039] Further, the sealing ring 9 is assembled between the oil collecting ring 3 and the motor front end cover 1, the sealing ring 9 is assembled on the motor front end cover 1 by machining the sealing ring 9 groove on the motor front end cover 1.

[0040] Further, the first oil collecting cavity 8 is formed between the oil collecting ring 3 and the motor front end cover 1.

[0041] Further, the oil channel 17 and the plug screw 18 are arranged on the bottom side of the motor front end cover 1, the plug screw 18 is arranged at the outlet of the oil channel 17, and the end of the oil channel 17 away from the plug screw 18 is connected with the first oil collecting cavity 8.

[0042] Further, the second oil collecting cavity 11 is arranged in the gearbox shell 13, the second oil collecting cavity 11 is the place for storing gearbox oil, which is a semi-open cavity, located in the rear shell of the gearbox, mainly used for collecting and storing the oil splashed out due to high-speed rotation of the gear. When the gear in the gearbox rotates, the oil will be stirred and splashed, and these splashed oil will naturally flow into the inlet of the second oil collecting cavity 11, which is arranged at the center of the cavity and has a certain downward angle to better guide the oil flow, the downward angle is 5°-10°.

[0043] Further, the oil inlet hole 15 and two oil outlets 16 are arranged on the open bearing 2, the oil inlet hole 15 is assembled at the bearing assembly position. The oil in the gearbox enters the bearing and other parts that need lubrication through the oil inlet hole 15, and the used oil flows out from the oil outlet 16. During the working process of the integrated device, the oil in the gearbox will splash, and the high-purity oil will flow into the open bearing 2 through the motor front end cover 1 to provide lubrication for it; at the same time, the oil in the chamber of the open bearing 2 flows out through the two oil outlets 16 under the action of gravity, and finally all flows back to the second oil collecting cavity 11, forming an effective lubrication cycle, which ensures that the open bearing 2 can continuously obtain fresh oil, significantly prolonging its working life. The second oil collecting cavity 11 not only stores new oil, but also collects used oil, forming a circulating lubrication system.

[0044] Further, the gearbox housing 13 is provided with a sun gear 14 connected with the motor shaft 6.

[0045] The utility model discloses a direct-coupled motor and gearbox integrated cavity's sealing structure, and it is provided with two seals. The first seal is composed of an oil seal 4, mainly used to block most of the working oil in the second oil collection cavity 11 on the gearbox. The second seal is a gap groove ring 5, which blocks the small amount of oil leakage when the motor runs for a long time or the oil seal 4 is installed improperly. If the motor runs for a longer time, the second seal may not be able to withstand a large amount of oil, and the oil will be thrown onto the oil collection ring 3 under the action of the motor shaft 6. Under the action of gravity, the oil will flow into the first oil collection cavity 8 at the bottom of the oil collection ring 3 and then flow to the top of the plug screw 18 through the oil channel 17. When the motor needs to be maintained, the plug screw 18 is removed, and the oil in the oil channel 17 is sucked out, which can keep the motor clean. The double-sealing design not only enhances the reliability of the device, but also prolongs the service life of the motor, while reducing maintenance costs.

[0046] The integrated device combines the motor and the gearbox bearing into one, which not only greatly improves the compactness of the structure, but also optimizes the allocation of resources. The common bearing cleverly uses the oil in the gearbox for lubrication, reducing the need for additional lubrication systems, significantly extending the service life of the bearing, and ensuring the efficient and stable operation of the entire device.

[0047] The above is only an embodiment of the utility model, and does not limit the patent scope of the utility model. Any equivalent structure or equivalent process conversion based on the content of the utility model specification and drawings, or direct or indirect application in other related technical fields, is also included in the patent protection scope of the utility model.

Claims

1. An integrated direct drive motor and gearbox assembly comprising a motor assembly and a gearbox assembly, characterized in that: The motor assembly comprises a motor shell, a motor front end cover connected with the motor shell and a motor shaft, the gearbox assembly comprises a gearbox shell, the motor shaft penetrates through the motor front end cover and is connected with the gearbox shell, The motor assembly is internally provided with an open bearing, an oil collecting ring, an oil seal, a gap groove ring, an axle check ring and a bearing pressing plate, the motor front end cover is assembled with the oil collecting ring, the gap groove ring is arranged on one end of the motor front end cover close to the oil collecting ring, The oil seal is assembled on the motor front end cover through interference fit, the oil seal is located in front of the oil collecting ring, the oil seal is arranged on the outside of the motor shaft through interference fit, and the gap groove ring is located between the oil collecting ring and the oil seal, The open bearing is assembled on the motor front end cover through clearance fit, the open bearing is located in front of the oil seal, and the open bearing is reinforced through the bearing pressing plate, The axle check ring is arranged in front of the open bearing and is used for limiting the axial movement of the open bearing.

2. The direct coupled motor and gearbox integrated device of claim 1, wherein: A sealing ring is assembled between the oil collecting ring and the motor front end cover.

3. The direct coupled motor and gearbox integrated device of claim 1, wherein: A first oil collecting cavity is formed between the oil collecting ring and the motor front end cover.

4. The direct coupled motor and gearbox integrated device of claim 3, wherein: An oil channel and a plug screw are arranged on the bottom side of the motor front end cover, the plug screw is arranged at the outlet of the oil channel, and one end of the oil channel away from the plug screw is connected with the first oil collecting cavity.

5. The direct coupled motor and gearbox integrated device of claim 1, wherein: A second oil collecting cavity is arranged in the gearbox shell.

6. The direct coupled motor and gearbox integrated device of claim 1, wherein: Oil inlet holes and two oil outlet ports are arranged on the open bearing.

7. The direct coupled motor and gearbox integrated device of claim 1, wherein: A sun gear is arranged in the gearbox shell, and the sun gear is connected with the motor shaft.

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