Pressure relief structure for power system enclosure

Abstract

A pressure relief structure for a power system enclosure. Without changing the size of an original transmission case and a sealed connection processing structure, a pressure relief channel (4) and a pressure relief hole (3) are provided to implement communication between the interior of a transmission case housing (2) and the interior of a motor housing (1), and the motor housing is provided with a ventilation valve. When a power system operates, the internal pressure of an original motor is less than the internal pressure of the transmission case. When the interior of the transmission case housing is communicated with the interior of the motor housing, pressure gas in the transmission case housing can be conveyed into the motor housing by means of the pressure relief channel and the pressure relief hole. Compared with an internal completely independent transmission case housing, the internal pressure of the transmission case housing is reduced, and the internal pressure of the transmission case may have a larger pressure relief space, thereby avoiding overflow and leakage of lubricating oil due to an excessive internal pressure. Moreover, the motor housing is provided with the ventilation valve, which can ensure normal operation. The stability of operation of the power system is improved, no external structural member is additionally provided, the improvement cost is low, and the effect is good.

Description

A power system box pressure relief structure Technical Field

[0001] The utility model belongs to the technical field of vehicle power systems, and in particular relates to a power system box pressure relief structure. Background Art

[0002] Currently, the power system of most electric motorcycles is placed in the middle of the frame. The power system mainly includes a motor and a transmission case. The two sides of the motor housing that are connected to the transmission case housing are the output end face of the motor housing and the input end face of the transmission case housing, respectively. The output end face and the input end face are respectively penetrated by an output port and an input port. The output port and the input port are coaxial, allowing the motor shaft to extend into the transmission case housing and connect with the drive shaft. In the power system, the sealing treatment level of the transmission case is usually lower than that of the motor or nearly the same. When the power system is running, as the speed of the drive shaft in the transmission case increases and the temperature rises, the internal pressure of the transmission case housing increases. Occasionally, the lubricating oil in the transmission case overflows from the sealed connection between the transmission case body and the end cover, the sealed connection where the drive shaft seal passes through the transmission case end cover, or even from the sealed connection between the transmission case input end face and the motor output end face, causing the lubricating oil in the transmission case housing to leak. This problem can be further optimized and improved.

[0003] If a one-way valve (also known as a breather valve) similar to the pressure relief valve on a motor housing is installed on the transmission housing, the high amount of lubricating oil in the transmission housing can easily be contaminated, causing the one-way valve to fail. Therefore, the more common practice is to directly drill a hole in the transmission housing to connect the air duct, and then guide the free end of the air duct to a location that does not affect the appearance. This method exposes the air duct to the outside and is easily damaged, contaminated, and easily detached. It can even absorb water into the transmission due to changes in air pressure, which has many disadvantages.

[0004] Summary of the Invention

[0005] In view of the above-mentioned deficiencies in the prior art, the purpose of the present invention is to provide a power system box pressure relief structure to solve the technical problem that the current transmission box is prone to lubricating oil leakage due to excessive internal pressure, thereby achieving the effect of improving the operating stability of the power system.

[0006] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0007] A power system housing pressure relief structure includes a power system, the power system including a motor and a transmission box, one side of the motor housing is opposite to and connected to one side of the transmission box housing, one side of the motor housing is an output end face, and one side of the transmission box housing is an input end face, an output port and an input port are respectively provided through the output end face and the input end face, and the motor shaft extends into the transmission box housing through the output port and the input port and is in transmission connection with the transmission shaft;

[0008] A pressure relief hole connected to the interior of the motor housing is opened through the output end face, and a pressure relief channel is opened in the shell wall of the transmission box housing. The two ends of the pressure relief channel are respectively a first channel opening and a second channel opening. The first channel opening is located on the inner wall of the transmission box housing to connect the pressure relief channel with the interior of the transmission box housing. The second channel opening is located on the input end face and is connected to the pressure relief hole; a circle of sealing portion is provided between the output end face and the input end face outside the second channel opening and the pressure relief hole.

[0009] Furthermore, the cross section of the pressure relief channel is circular and the inner diameter increases gradually from the first channel opening to the second channel opening.

[0010] Furthermore, the transmission shaft is perpendicular to the motor shaft, and the transmission box housing is divided into a main body with an opening and an end cover for closing the opening along the axial direction of the transmission shaft; the output end face is located on the main body, and the pressure relief channel is opened in the shell wall of the main body and includes a connecting section and a conducting section vertically connected, the free end of the connecting section is the first channel opening, the free end of the conducting section is the second channel opening, and the connecting section is in the same direction as the transmission shaft and opposite to the opening.

[0011] Furthermore, the transmission shaft and the motor shaft are respectively provided with hyperbolic gears which are meshed with each other to achieve transmission connection.

[0012] Furthermore, one end of the transmission shaft rotates through the end cover and extends out of the transmission box housing, and the other end rotates and is arranged in a support hole opened on the inner wall of the main body along its axial direction. The first channel opening is located on the bottom surface of the support hole and is connected to the interior of the transmission box housing through the support hole.

[0013] Furthermore, a first annular groove is formed on the input end surface, the second channel opening is located on the bottom surface of the first annular groove, the first annular groove is communicated with the pressure relief hole, and the first annular groove is located inside the sealing portion.

[0014] Furthermore, a second annular groove opposite to the first annular groove is recessed on the output end surface, the first annular groove and the second annular groove constitute an annular pressure relief chamber, the pressure relief hole is opened on the bottom surface of the second annular groove, the second channel opening is connected to the pressure relief hole through the pressure relief chamber, and the pressure relief chamber is located on the inner side of the sealing portion.

[0015] Furthermore, the sealing portion includes a circle of sealing grooves opened on the output end face, a circle of sealing gaskets is arranged in the sealing grooves, and the sealing gaskets are respectively in sealing contact with the bottom surface of the sealing groove and the input end face.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] The power system case pressure relief structure described in the present invention realizes the communication between the transmission case and the motor case by opening a pressure relief channel and a pressure relief hole without changing the original transmission case volume and the sealing connection processing structure. When the power system is running, the pressure inside the original motor is lower than the pressure inside the transmission case. After the transmission case and the motor case are connected, the pressurized gas in the transmission case can be transported to the motor case through the pressure relief channel and the pressure relief hole. Compared with the completely independent interior of the transmission case, the internal pressure of the transmission case is reduced, and the internal pressure of the transmission case can have a larger pressure relief space, thereby avoiding overflow and leakage of lubricating oil due to excessive internal pressure. The motor case is provided with a breathable valve to ensure the normal operation of the whole, which is beneficial to improving the stability of the power system operation, and does not increase external structural parts, so the improvement cost is low and the effect is good.

[0018] During use, the lubricating oil in the transmission case occasionally enters the pressure relief channel and is stored at the bottom of the pressure relief chamber formed by the first and second ring grooves. This can be cleaned and replenished regularly (e.g., every six months) during maintenance. Occasionally, the lubricating oil is transported through the pressure relief hole into the motor housing. Because the motor housing has a large internal space, the stator and rotor of the motor also need lubrication, which does not affect the operation of the motor. There is no need for an exposed vent pipe on the outside of the transmission case, eliminating many of its disadvantages. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] FIG1 is a perspective view of the power system described in the embodiment;

[0020] FIG2 is a front view of the power system according to the embodiment;

[0021] FIG3 is a schematic cross-sectional view taken along line AA in FIG2 ;

[0022] Among them, the motor housing 1, the transmission box housing 2, the pressure relief hole 3, the pressure relief channel 4, the first channel opening 5, the second channel opening 6, the transmission shaft 7, the main body 8, the end cover 9, the connecting section 10, the conducting section 11, the first ring groove 14, the second ring groove 15, the motor shaft 17, and the sealing ring 19. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. The components of the embodiments of the present invention generally described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the utility model for protection, but merely represents selected embodiments of the present invention. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0024] It should be noted that similar reference numerals and letters denote similar items in the following figures. Therefore, once an item is defined in one figure, it does not require further definition or explanation in subsequent figures. In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating positions or relationships, are based on the positions or relationships shown in the figures, or the positions or relationships in which the utility model product is typically placed when in use. These terms are intended solely for ease of description and simplification of the description of the utility model, and do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the utility model. Furthermore, the terms "first," "second," and "third," etc., are used solely to distinguish descriptions and should not be construed as indicating or implying relative importance. Furthermore, terms such as "horizontal" and "vertical" do not imply that a component must be absolutely horizontal or overhanging, but rather may be slightly tilted. For example, "horizontal" simply refers to a direction that is more horizontal than "vertical," and does not imply that the structure must be completely horizontal, but rather may be slightly tilted. It should also be noted that, in the description of this utility model, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0025] Example:

[0026] Please refer to Figures 1, 2 and 3. A power system box pressure relief structure includes a power system, which includes a motor and a transmission box. That is, the power system box includes a motor housing 1 and a transmission box housing 2. One side of the motor housing 1 is opposite to one side of the transmission box housing 2 and is sealed. One side of the motor housing 1 is an output end face, and one side of the transmission box housing 2 is an input end face. The output end face and the input end face are respectively penetrated by a coaxial output port and input port. The motor shaft 17 extends into the transmission box housing 2 through the output port and the input port and is transmission-connected to the transmission shaft 7.

[0027] A pressure relief hole 3 communicating with the interior of the motor housing 1 is provided on the output end face, and a pressure relief channel 4 isolated from the outside is provided on the transmission box housing 2. The two ends of the pressure relief channel 4 are respectively a first channel opening 5 and a second channel opening 6. The first channel opening 5 is located on the inner wall of the transmission box housing 2 to connect the pressure relief channel 4 with the interior of the transmission box housing 2. The second channel opening 6 is located on the input end face and connected with the pressure relief hole 3; a circle of sealing portion is provided between the output end face and the input end face outside the second channel opening 6 and the pressure relief hole 3.

[0028] The power system box pressure relief structure of the present invention is provided with a pressure relief hole 3 on the output end face of the motor housing 1 which is sealed with the input end face of the transmission box housing 2, and the pressure relief hole 3 is communicated with the inside of the motor housing 1, and a pressure relief channel 4 isolated from the outside is provided on the transmission box housing 2, and the two ends of the pressure relief channel 4 are respectively communicated with the inside of the transmission box housing 2 and the pressure relief hole 3; without changing the original transmission box volume and the sealing connection processing structure, the transmission box housing 2 and the motor housing 1 are connected by providing the pressure relief channel 4 and the pressure relief hole 3, and when the power system is running, the pressure inside the original motor is The pressure inside the transmission box is lower than that inside the transmission box housing 2. After the transmission box housing 2 and the motor housing 1 are internally connected, the pressurized gas inside the transmission box housing 2 can be transported to the motor housing 1 through the pressure relief channel 4 and the pressure relief hole 3. Compared with the completely independent interior of the transmission box housing 2, the internal pressure of the transmission box housing 2 is reduced, and the internal pressure of the transmission box can have a larger pressure relief space, thereby avoiding overflow and leakage of lubricating oil due to excessive internal pressure; and a breather valve is provided on the motor housing to prevent the internal pressure of the motor from being too high after long-term operation. At the same time, the pressure of the transmission box can also be released to ensure the normal operation of the whole, which is conducive to improving the stability of the power system operation.

[0029] 2 and 3 , the cross section of the pressure relief channel 4 is circular and the inner diameter increases from the first channel opening 5 to the second channel opening 6 ; thus, even if lubricating oil enters the pressure relief channel 4 from the first channel opening 5 , it is not easy to cause blockage of the pressure relief channel 4 .

[0030] Please refer to Figures 2 and 3. The transmission shaft 7 is perpendicular to the motor shaft 17. The transmission box housing 2 is divided into a main body 8 with an opening and an end cover 9 for closing the opening along the axial direction of the transmission shaft 7, and the output end face is located on the main body 8; the pressure relief channel 4 is opened on the main body 8 and includes a connecting section 10 and a conducting section 11 vertically connected, the free end of the connecting section 10 is the first channel opening 5, and the free end of the conducting section 11 is the second channel opening 6. The connecting section 10 is in the same direction as the transmission shaft 7 and is opposite to the opening; in this way, firstly, the connecting section 10 is in the same direction as the transmission shaft 7, so that the first channel opening 5 is in the axial direction of the transmission shaft 7. When the components on the transmission shaft 7 stir the lubricating oil, it is not easy for the lubricating oil to enter the pressure relief channel 4 from the first channel opening 5; secondly, the pressure relief channel 4 is divided into two sections, the connecting section 10 can be drilled on the inner wall of the main body 8 through the opening, and the conducting section 11 is drilled directly from the input end face. The two ends are drilled in sections, which is conducive to reducing the difficulty of processing and forming the pressure relief channel 4.

[0031] Please refer to Figures 2 and 3. One end of the transmission shaft 7 rotates through the end cover 9 and extends to the outside of the transmission box housing 2, and the other end rotates and is arranged in a support hole opened on the inner wall of the main body 8 along its axial direction. The first channel opening 5 is located on the bottom surface of the support hole and is connected to the interior of the transmission box housing 2 through the support hole; in this embodiment, a bearing (not shown in the figure) is provided in the support hole, and the bearing is fixedly sleeved on the transmission shaft 7 so that the transmission shaft 7 can rotate with the support hole. There is a distance between the end face of the transmission shaft 7 and the bottom surface of the support hole, and the first channel opening 5 is connected to the interior of the transmission box housing 2 through the gap of the bearing itself and the support hole.

[0032] In this way, the length of the connecting section 10 with a smaller diameter can be shortened, which is beneficial to reducing the difficulty of processing and forming the pressure relief channel 4 and reducing the possibility of the pressure relief channel 4 being blocked by lubricating oil.

[0033] Furthermore, when the power system box pressure relief structure is mounted on the vehicle frame, the pressure relief channel 4 extends horizontally, with the first channel opening 5 higher than the transmission shaft 7 and the pressure relief hole 3 higher than the motor shaft 17. Referring to Figures 2 and 3 , a first annular groove 14 is recessed into the input end surface. The input port is located inside and coaxial with the first annular groove 14. The second channel opening 6 is located on the bottom surface of the first annular groove 14. The first annular groove 14 communicates with the pressure relief hole 3 and is located inside the sealing portion. This eliminates the need to ensure that the pressure relief hole 3 and the second channel opening 6 are aligned, which helps reduce manufacturing and assembly difficulties.

[0034] Please refer to Figures 2 and 3. A second annular groove 15 is recessed on the output end surface and is opposite to the first annular groove 14. The output port is located on the inner side of the second annular groove 15. The first annular groove 14 and the second annular groove 15 constitute an annular pressure relief chamber. The pressure relief hole 3 is opened on the bottom surface of the second annular groove 15. The second channel port 6 is connected to the pressure relief hole 3 through the pressure relief chamber. The pressure relief chamber is located on the inner side of the sealing portion. In this way, the provision of the first annular groove 14 and the second annular groove 15 is not only conducive to reducing the weight of the transmission case housing 2 and the motor housing 1, but also increases the internal space of the pressure relief channel 4, which is conducive to further reducing the pressure inside the transmission case housing 2 when the power system is running.

[0035] Please refer to Figures 2 and 3. The sealing portion includes a circle of sealing grooves opened on the output end face, and a circle of sealing gaskets (not shown in the figures) are coaxially arranged in the sealing groove. The sealing gaskets are sealed against the bottom surface of the sealing groove and the input end face respectively; by providing the sealing portion, the interior of the transmission box housing 2 is prevented from being connected to the outside world through the connection between the first channel opening 5 and the pressure relief hole 3, thereby preventing water from entering the transmission box housing 2 and leakage of lubricating oil.

[0036] Please refer to Figures 2 and 3. In this embodiment, the end of the motor shaft 17 facing the output port passes through the output port and the input port in sequence and extends into the interior of the transmission box housing 2. The free end of the motor shaft 17 has hyperbolic teeth to form a hyperbolic gear and meshes with the hyperbolic gear on the transmission shaft 7 to achieve a more stable and quiet transmission connection. Sealing rings 19 are provided in the output port and the input port. The sealing ring 19 is sealed on the motor shaft 17 so that the motor shaft 17 is sealed with the output port and the input port respectively.

[0037] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit the technical solution. Ordinary technicians in this field should understand that those modifications or equivalent replacements of the technical solution of the present invention that do not depart from the purpose and scope of the technical solution of the present invention should be included in the scope of the claims of the present invention.

Claims

1. A power system box pressure relief structure, characterized in that: The power system includes a motor and a transmission box, one side of the motor housing is opposite to and connected to one side of the transmission box housing, one side of the motor housing is an output end face, one side of the transmission box housing is an input end face, an output port and an input port are respectively provided on the output end face and the input end face, and the motor shaft extends into the transmission box housing through the output port and the input port to be transmission-connected with the transmission shaft; A pressure relief hole connected to the interior of the motor housing is opened through the output end face, and a pressure relief channel is opened in the shell wall of the transmission box housing. The two ends of the pressure relief channel are respectively a first channel opening and a second channel opening. The first channel opening is located on the inner wall of the transmission box housing to connect the pressure relief channel with the interior of the transmission box housing. The second channel opening is located on the input end face and connected to the pressure relief hole; a circle of sealing portion is provided between the output end face and the input end face outside the second channel opening and the pressure relief hole.

2. According to claim 1, a power system box pressure relief structure is characterized in that: The cross section of the pressure relief channel is circular and the inner diameter increases from the first channel opening to the second channel opening.

3. A power system box pressure relief structure according to claim 2, characterized in that: The transmission shaft is perpendicular to the motor shaft, and the transmission box housing is divided into a main body with an opening and an end cover for closing the opening along the axial direction of the transmission shaft; the output end face is located on the main body, and the pressure relief channel is opened in the shell wall of the main body and includes a connecting section and a conducting section that are vertically connected, the free end of the connecting section is a first channel opening, and the free end of the conducting section is a second channel opening, and the connecting section is in the same direction as the transmission shaft and opposite to the opening.

4. A power system box pressure relief structure according to claim 3, characterized in that: The transmission shaft and the motor shaft are respectively provided with hyperbolic gears which mesh with each other to realize transmission connection.

5. According to claim 3, a power system box pressure relief structure is characterized in that: One end of the transmission shaft rotates through the end cover and extends out of the transmission box housing, and the other end is rotated and arranged in a support hole opened on the inner wall of the main body along its axial direction. The first channel opening is located on the bottom surface of the support hole and is connected to the inside of the transmission box housing through the support hole.

6. The power system box pressure relief structure according to claim 1, characterized in that: A first annular groove is formed on the input end surface, the input port is located inside the first annular groove and is coaxial with the first annular groove, the second channel port is located on the bottom surface of the first annular groove, the first annular groove is connected to the pressure relief hole, and the first annular groove is located inside the sealing portion.

7. A power system box pressure relief structure according to claim 6, characterized in that: A second annular groove opposite to the first annular groove is recessed on the output end surface, and the output port is located on the inner side of the second annular groove. The first annular groove and the second annular groove constitute an annular pressure relief cavity. The pressure relief hole is opened on the bottom surface of the second annular groove. The second channel port is connected with the pressure relief hole through the pressure relief cavity, and the pressure relief cavity is located on the inner side of the sealing portion.

8. The power system box pressure relief structure according to claim 1, characterized in that: The sealing part comprises a circle of sealing grooves opened on the output end surface, a circle of sealing gaskets are arranged in the sealing grooves, and the sealing gaskets are respectively in sealing contact with the bottom surface of the sealing groove and the input end surface.

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