Oil leakage monitoring structure between motor and transmission

Abstract

According to the oil leakage monitoring structure between the motor and the transmission disclosed by the invention, oil leaked from the position of an oil seal at the initial stage of failure of the oil seal can be quickly sensed, so that an initial oil leakage fault is effectively identified, and further effective troubleshooting and fault repair of the oil seal are carried out to avoid motor faults. The motor comprises a motor shell, a motor shaft and a motor inner cavity; the transmission comprises a transmission shell, a transmission input shaft and a transmission inner cavity; the oil liquid sensor is used for sensing and sending out an alarm signal after being in contact with the oil liquid; a pair of opposite end faces of the motor shell and the transmission shell is fixedly connected to form a common connector, the motor shaft and the transmission input shaft are coaxially arranged and form an integrated shaft through a connecting mechanism, and the integrated shaft penetrates through the common connector. Positioning bearings are arranged on the two sides of the position, corresponding to the common connecting body, of the integrated shaft respectively.

Description

Technical Field

[0001] The present invention relates to the technical field of new energy powertrains, and in particular to an oil leakage monitoring structure between a motor and a transmission. Background Art

[0002] In common new energy powertrains, the internal cavities of the motor and the transmission are separated by a partition. The interior of the motor is usually a hollow cavity, and gear oil is set in the internal cavity of the transmission. An oil seal facing the transmission is usually set between the motor and the transmission for sealing, thereby preventing the gear oil inside the transmission from flowing out. Since the oil seal at the transmission is a wearing part, oil leakage is prone to occur after a long period of operation or poor assembly. The gear oil flows out through the damaged oil seal on the transmission side, making it easy for the gear oil to flow into the inner cavity of the motor. When the amount of oil flowing into the inner cavity of the motor increases, it will cause insulation failure inside the motor.

[0003] Due to the location of the oil shuttle between the motor and the transmission, in the early stage of oil seal failure, when the oil just starts to flow out, it is difficult to effectively identify the initial oil leakage through visual means, and it is impossible to effectively troubleshoot and repair the oil seal failure, which will cause further motor failure. Summary of the invention

[0004] In response to the above problems, the present invention provides an oil leakage monitoring structure between the motor and the transmission. In the early stage of oil seal failure, the oil leaking through the oil seal position can be quickly sensed, thereby effectively identifying the initial oil leakage fault, and then effectively troubleshooting and repairing the oil seal fault to avoid motor failure.

[0005] An oil leakage monitoring structure between a motor and a transmission, characterized in that it comprises:

[0006] The motor comprises a motor housing, a motor shaft and a motor inner cavity;

[0007] A transmission, comprising a transmission housing, a transmission input shaft, and a transmission inner cavity;

[0008] and an oil sensor, which senses and sends out an alarm signal when it comes into contact with the oil;

[0009] A pair of facing end faces of the motor housing and the transmission housing are fixedly connected to form a common connecting body, the motor shaft and the transmission input shaft are coaxially arranged, the motor shaft and the transmission input shaft form an integral shaft through a connecting mechanism, the integral shaft is arranged through the common connecting body, and locating bearings are respectively arranged on both sides of the integral shaft corresponding to the position of the common connecting body, one of the locating bearings close to the inner cavity of the motor is a motor bearing, and the other locating bearing close to the inner cavity of the transmission is a transmission bearing, an oil seal is sleeved on one axial position of the integral shaft between the two sets of locating bearings, and an axial gap is left between the oil seal and the outer periphery of the integral shaft corresponding to the motor bearing;

[0010] An oil leakage channel is provided in the common connecting body, and the oil leakage channel is connected to the axial gap from bottom to top, and the oil sensor is fixedly installed at the bottom of the oil leakage channel.

[0011] It is further characterized by:

[0012] The motor housing includes a first end face of the motor and a second end face of the motor, the transmission housing includes a first end face of the transmission and a second end face of the transmission, the second end face of the motor and the first end face of the transmission are fixedly connected to form a common connection body, the second end face of the motor is provided with a first through hole at a position corresponding to the integral shaft, the first end face of the transmission is provided with a second through hole at a position corresponding to the integral shaft, the first through hole is provided with a first bearing stop structure near the annular wall of the motor inner cavity, the motor bearing is arranged in the first bearing stop structure, the second through hole is provided with a second bearing stop structure near the annular wall of the transmission inner cavity, the transmission bearing is arranged in the second bearing stop structure;

[0013] The outer periphery of the second end face of the motor and the first end face of the transmission corresponding to the position of the through hole is provided with a concave-convex positioning mechanism, and the concave-convex positioning mechanism ensures fast and reliable alignment of the motor and the transmission;

[0014] The concave-convex positioning mechanism includes a convex shaft ring and a concave ring groove. The second end surface of the motor is provided with a convex shaft ring, and the first end surface of the transmission is provided with a concave ring groove. The convex shaft ring is sleeved with a first sealing ring, and the inner wall of the concave ring groove is arranged closely to the first sealing ring to ensure reliable connection and sealing;

[0015] The outer ring of the oil seal fits the inner ring wall of the second through hole away from the inner cavity of the transmission, and a central annular gap is formed after the second end face of the motor and the first end face of the transmission are fixedly connected, and the axial gap is connected to the central annular gap. The central annular gap is formed by the above-mentioned structural combination, and the central annular gap is used to expand the buffer space of oil leakage, so that the oil leakage is not easy to flow directly into the motor cavity along the axial gap, and the oil leakage channel is opened at the bottom position of the transmission housing, and the oil leakage channel is connected from bottom to top to the bottom area of ​​the central annular gap;

[0016] The oil leakage channel is arranged vertically to form a vertical guide hole. The vertical arrangement makes the leaked oil path shortest and enables the fastest oil leakage feedback.

[0017] A mounting hole is also provided at the bottom of the oil leakage channel, and the oil sensor is inserted into the mounting hole to ensure fast and efficient installation;

[0018] The connecting mechanism is a threaded connecting mechanism, a concave center screw hole is arranged at the center of the output end of the motor shaft, a convex center screw rod is arranged at the center of the input end of the transmission input shaft, the convex center screw rod passes through the second through hole and the first through hole and then is threadedly fixedly connected to the concave center screw hole to form an integrated shaft.

[0019] After adopting the structure of the present invention, when the oil seal on the transmission side fails, the transmission gear oil will pass through the oil seal and enter the cavity formed by the motor transmission housing. The leaked oil first enters the axial gap on the integrated shaft corresponding to the oil seal and the motor bearing. Under the action of gravity, a part of the gear oil in the axial gap will flow into the oil leakage channel and then contact the oil sensor. Then the oil sensor senses the oil and sends an electrical signal, thereby identifying the oil leakage fault. At this time, the motor and transmission can be disassembled, and the transmission oil seal can be replaced for maintenance to avoid further motor failure. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a cross-sectional structural schematic diagram of the present invention;

[0021] Figure 2 It is a schematic enlarged diagram of the gear oil flow direction when oil is leaking in the cross-sectional view state of the present invention;

[0022] Figure 3 for Figure 1 A local enlarged structural schematic diagram;

[0023] The names corresponding to the serial numbers in the figure are as follows:

[0024] Motor 100, transmission 200;

[0025] Oil seal 1, axial gap 2, oil leakage channel 3, mounting hole 301, first through hole 4, second through hole 5, convex shaft ring 6, concave ring groove 7, first sealing ring 8, center annular gap 9, oil sensor 10, motor housing 20, motor first end face 21, motor second end face 22, motor shaft 30, concave center screw hole 31, alignment cone cavity 32, motor inner cavity 40, motor bearing 41, first bearing stop structure 42, transmission housing 50, transmission first end face 51, transmission second end face 52, transmission input shaft 60, forward convex center screw 61, top cone 62, second sealing ring 63, transmission inner cavity 70, transmission bearing 71, second bearing stop structure 72, integrated shaft 80, common connector 90. DETAILED DESCRIPTION

[0026] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0027] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0028] In the description of the invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it 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 it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the invention can be understood according to specific circumstances.

[0029] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0030] An oil leakage monitoring structure between a motor and a transmission, see Figure 1-Figure 3 , which includes a motor 100, a transmission 200, and an oil sensor 10;

[0031] The motor 100 includes a motor housing 20, a motor shaft 30, and a motor inner cavity 40. The motor housing 20 includes a motor first end face 21 and a motor second end face 22. The left side of the figure is the motor first end face 21, and the right side is the motor second end face 22.

[0032] The transmission 200 includes a transmission housing 50, a transmission input shaft 60, and a transmission inner cavity 70. The transmission housing 50 includes a transmission first end face 51 and a transmission second end face 52. The left side of the figure is the transmission first end face 51, and the right side is the transmission second end face 52.

[0033] The oil sensor 10 senses and sends out an alarm signal after contacting the oil;

[0034] A pair of facing end faces of the motor housing 20 and the transmission housing 50 are fixedly connected to form a common connecting body 90, the motor shaft 30 and the transmission input shaft 60 are coaxially arranged, and the motor shaft 30 and the transmission input shaft 60 form an integral shaft 80 through a connecting mechanism, and the integral shaft 80 is arranged to penetrate the common connecting body 90, and locating bearings are respectively arranged on both sides of the integral shaft 80 corresponding to the position of the common connecting body 90, one of which is close to the motor inner cavity 40. The motor bearing 41, and the other locating bearing close to the transmission inner cavity 70 is the transmission bearing 71, and an oil seal 1 is sleeved on one of the axial positions of the integral shaft 80 between the two sets of locating bearings, and an axial gap 2 is left at the periphery of the oil seal 1 and the integral shaft corresponding to the motor bearing;

[0035] An oil leakage channel 3 is provided in the common connecting body 90 . The oil leakage channel 3 is connected to the axial gap 2 from bottom to top. An oil sensor 10 is fixedly installed at the bottom of the oil leakage channel 3 .

[0036] In a specific implementation, the second end face 22 of the motor and the first end face 51 of the transmission are fixedly connected to form a common connecting body 90, the second end face 22 of the motor is provided with a first through hole 4 at a position corresponding to the integral shaft 80, the first end face 51 of the transmission is provided with a second through hole 5 at a position corresponding to the integral shaft 80, the first through hole 4 is provided with a first bearing stop structure 42 near the annular wall of the motor inner cavity 40, the motor bearing 41 is arranged in the first bearing stop structure 42, the second through hole 5 is provided with a second bearing stop structure 72 near the annular wall of the transmission inner cavity 70, the transmission bearing 71 is arranged in the second bearing stop structure 72;

[0037] The outer peripheries of the second end face 22 of the motor and the first end face 51 of the transmission corresponding to the positions of the first through hole 4 and the second through hole 5 are provided with concave-convex positioning mechanisms, which ensure fast and reliable alignment of the motor 100 and the transmission 200 .

[0038] In specific implementation, the concave-convex positioning mechanism includes a convex shaft ring 6 and a concave ring groove 7. The second end face 22 of the motor is provided with a convex shaft ring 6, and the first end face 51 of the transmission is provided with a concave ring groove 7. The convex shaft ring 6 is sleeved with a first sealing ring 8, and the inner wall of the concave ring groove 7 is arranged closely to the first sealing ring 8 to ensure reliable connection sealing.

[0039] The outer ring of the oil seal 1 fits the inner ring wall of the second through hole 5 away from the transmission inner cavity 70. After the second end face 22 of the motor and the first end face 51 of the transmission are fixedly connected, a central annular gap 9 is formed. The axial gap 2 is connected to the central annular gap 9. The central annular gap 9 is formed by the above-mentioned structural combination. The central annular gap 9 is used to expand the buffer space for oil leakage, so that the leaked oil is not easy to flow directly into the motor cavity along the axial gap. The oil leakage channel 3 is opened at the bottom position of the transmission housing 50, and the oil leakage channel 3 is connected to the bottom area of ​​the central annular gap 9 from bottom to top.

[0040] In specific implementation, the oil leakage channel 3 is arranged vertically to form a vertical guide hole. The vertical arrangement makes the leaked oil path shortest and enables the fastest oil leakage feedback. In a preferred embodiment, the vertical guide hole is a circular hole.

[0041] A mounting hole 301 is also provided at the bottom of the oil leakage channel 3, and the oil sensor 10 is inserted into the mounting hole 301 to ensure fast and efficient installation.

[0042] In a specific implementation, the mounting hole 301 is a screw hole, the connecting end of the oil sensor 10 is a stud structure, and the stud structure of the oil sensor 10 is threadedly inserted into the screw hole.

[0043] The connection mechanism between the motor shaft 30 and the transmission input shaft 60 is a threaded connection mechanism. A concave center screw hole 31 is set at the center of the output end of the motor shaft 30, and a convex center screw 61 is set at the center of the input end of the transmission input shaft 60. The convex center screw 31 passes through the second through hole 5 and the first through hole 4 and is then threadedly fixed to the concave center screw hole 31 to assemble into an integrated shaft 80.

[0044] In the preferred embodiment of the specific implementation, the forward convex central screw 61 further includes a top cone 62, and the inner concave central screw hole 31 further includes a counter cone cavity 32, and the top cone 62 is counter-inserted into the counter cone cavity 32 to ensure concentricity;

[0045] A second sealing ring 63 is also installed at the end surfaces of the forward convex central screw 61 and the concave central screw hole 31 facing the axial gap 2 .

[0046] Its working principle is as follows: the motor and the transmission are connected coaxially, the input shaft of the transmission is inserted into the motor shaft of the motor, the transmission housing and the motor housing are fitted together and locked together by bolts, and a sealing ring is arranged between the housings of the motor and the transmission that are fitted together, and an oil seal is sleeved on the integral shaft of the transmission facing the motor side, the outer ring of the oil seal fits the inner wall of the transmission housing, and the inner ring of the oil seal fits tightly against the input shaft of the transmission; a first sealing ring is arranged on the concave-convex positioning mechanism formed by the motor housing and the transmission housing, and the inner and outer sides of the first sealing ring are respectively fitted with the motor housing and the transmission housing; the first sealing ring is arranged coaxially with the transmission oil seal, and the inner circumference of the first sealing ring is larger than the outer circumference of the oil seal, so as to separate the oil seal from the outside air; the upper end opening of the oil leakage channel is arranged at the lowermost end of the cavity formed by the transmission oil seal and the sealing ring; The cavity formed by the transmission oil seal and the sealing ring includes an axial gap and a center annular gap. The oil sensor is threadedly connected to the mounting hole at the bottom opening of the oil leakage channel. When the oil seal on the transmission side fails, the transmission gear oil will pass through the oil seal and enter the cavity formed by the motor transmission housing. The cavity includes an axial gap and a center annular gap. The leaked oil first enters the axial gap on the integrated shaft corresponding to the oil seal and the motor bearing, and then flows into the center annular gap. Under the action of gravity, part of the gear oil in the center annular gap will flow into the oil leakage channel and then contact the oil sensor. Then the oil sensor senses the oil and sends an electrical signal to identify the oil leakage fault. At this time, the motor and transmission can be disassembled and the transmission oil seal can be replaced for maintenance to avoid further motor failure.

[0047] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0048] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. An oil leakage monitoring structure between a motor and a transmission, characterized in that: It includes: The motor comprises a motor housing, a motor shaft and a motor inner cavity; A transmission, comprising a transmission housing, a transmission input shaft, and a transmission inner cavity; and an oil sensor, which senses and sends out an alarm signal when it comes into contact with the oil; A pair of facing end faces of the motor housing and the transmission housing are fixedly connected to form a common connecting body, the motor shaft and the transmission input shaft are coaxially arranged, the motor shaft and the transmission input shaft form an integral shaft through a connecting mechanism, the integral shaft is arranged through the common connecting body, and locating bearings are respectively arranged on both sides of the integral shaft corresponding to the position of the common connecting body, one of the locating bearings close to the inner cavity of the motor is a motor bearing, and the other locating bearing close to the inner cavity of the transmission is a transmission bearing, an oil seal is sleeved on one axial position of the integral shaft between the two sets of locating bearings, and an axial gap is left between the oil seal and the outer periphery of the integral shaft corresponding to the motor bearing; An oil leakage channel is provided in the common connecting body, and the oil leakage channel is connected to the axial gap from bottom to top, and the oil sensor is fixedly installed at the bottom of the oil leakage channel.

2. The oil leakage monitoring structure between a motor and a transmission according to claim 1, characterized in that: The motor housing includes a first end face of the motor and a second end face of the motor, and the transmission housing includes a first end face of the transmission and a second end face of the transmission. The second end face of the motor and the first end face of the transmission are fixedly connected to form a common connecting body, and a first through hole is provided on the second end face of the motor corresponding to the position of the integrated shaft, and a second through hole is provided on the first end face of the transmission corresponding to the position of the integrated shaft. A first bearing stop structure is provided on the annular wall of the first through hole near the inner cavity of the motor, and the motor bearing is arranged in the first bearing stop structure, and a second bearing stop structure is provided on the annular wall of the second through hole near the inner cavity of the transmission, and the transmission bearing is arranged in the second bearing stop structure.

3. The oil leakage monitoring structure between a motor and a transmission according to claim 2 is characterized in that: The outer circumferences of the second end surface of the motor and the first end surface of the transmission corresponding to the positions of the through holes are provided with concave-convex positioning mechanisms.

4. The oil leakage monitoring structure between a motor and a transmission according to claim 3 is characterized in that: The concave-convex positioning mechanism includes a convex shaft ring and a concave ring groove. The second end face of the motor is provided with a convex shaft ring, the first end face of the transmission is provided with a concave ring groove, the convex shaft ring is sleeved with a first sealing ring, and the inner wall of the concave ring groove is arranged closely against the first sealing ring.

5. The oil leakage monitoring structure between a motor and a transmission according to claim 1, characterized in that: The outer ring of the oil seal fits the inner ring wall of the second through hole away from the transmission inner cavity, and a central annular gap is formed after the second end face of the motor and the first end face of the transmission are fixedly connected. The axial gap is connected to the central annular gap, and the oil leakage channel is opened at the bottom position of the transmission housing, and the oil leakage channel is connected from bottom to top to the bottom area of ​​the central annular gap.

6. The oil leakage monitoring structure between a motor and a transmission according to claim 5, characterized in that: The oil leakage channel is arranged vertically to form a vertical guide hole.

7. The oil leakage monitoring structure between a motor and a transmission according to claim 1, characterized in that: A mounting hole is also provided at the bottom of the oil leakage channel, and the oil sensor is inserted into the mounting hole.

8. The oil leakage monitoring structure between a motor and a transmission according to claim 1, characterized in that: The connecting mechanism is a threaded connecting mechanism, a concave center screw hole is arranged at the center of the output end of the motor shaft, a convex center screw rod is arranged at the center of the input end of the transmission input shaft, the convex center screw rod passes through the second through hole and the first through hole and then is threadedly fixedly connected to the concave center screw hole to form an integrated shaft.

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