Oil-cooled drive motor with replaceable oil filter

Abstract

Oil-cooled drive motor, including: a housing that accommodates components and has an oil flow path through which a coolant flows to cool the components; a filter housing formed on the housing; and a replaceable oil filter that is interchangeably coupled with the filter housing to filter foreign substances in the coolant, the filter housing includes: a filter insertion chamber designed to securely hold the oil filter; an oil inlet designed to connect the filter insertion chamber to an outlet side of the oil flow path in order to supply oil to the filter insertion chamber; an oil drain pipe designed to be connected to an inlet side of the oil flow path in order to return oil filtered through the oil filter to the oil flow path, and projecting towards the filter insertion chamber; and an opening / closing flap provided on an inner surface of the filter insertion chamber and designed to seal the oil inlet by moving to one side in a circumferential direction and to open the oil inlet by moving to the other side in a circumferential direction.

Description

Cross-reference to related registration

[0001] The present application claims priority over Korean patent application No. 10-2024-0134737, filed on October 4, 2024, the entire contents of which are hereby incorporated by reference for all purposes. Background of the invention; Field of the invention

[0002] The present invention relates to a liquid-cooled drive motor with a replaceable oil filter and in particular to a liquid-cooled drive motor with a replaceable oil filter which is provided with an opening / closing device on the oil flow path to prevent oil from escaping from the filter housing during the oil filter change. Description of the state of the art

[0003] A hybrid vehicle operates in electric vehicle (EV) mode using only the power of the drive motor, or in hybrid electric vehicle (HEV) mode using the torque of both the internal combustion engine and the drive motor. The drive motor, which serves as a power source for the vehicle, consists of a stator core and a rotor core, with the stator core coupled to the motor housing and the rotor core located within the stator core.

[0004] A coolant flow path is formed on the housing to dissipate the heat generated by the stator core and rotor core during motor operation, and a coolant flows through the flow path to cool the stator core and rotor core.

[0005] If the inside of the engine is cooled directly with oil, foreign substances, such as shavings produced in the reduction gear, can move with the oil and cause problems in engine operation if they are not removed.

[0006] Therefore, an oil filter is installed in the cooling flow path, where oil circulates, to filter out chips and contaminants along with the oil. More recently, oil filters have been designed to be replaceable, allowing the installed filter to be removed and replaced with a new one after a certain period of time to improve the efficiency of contaminant removal.

[0007] Conventional drive motors with replaceable oil filters require a complete drain before a filter change due to the risk of oil leakage, as oil can escape when the filter is removed, followed by the cumbersome process of refilling oil after the change.

[0008] Therefore, there is a need to develop a technology that blocks the oil flow path during oil filter changes to prevent oil leakage. Summary of the invention

[0009] The present invention was designed to solve the aforementioned problem. One objective of the invention is to provide an oil-cooled drive motor that includes a replaceable oil filter equipped with an opening / closing device in the oil flow path to prevent oil leakage during oil filter changes.

[0010] A further object of the present invention is to provide an oil-cooled drive motor comprising a replaceable oil filter equipped with an inlet opening / closing device that can seal the oil inlet which supplies the oil filter chamber with oil during the oil filter change, and an outlet opening / closing device that can block the upstream side of the oil flow path where filtered oil is supplied.

[0011] Another object of the present invention is to provide an oil-cooled drive motor with a replaceable oil filter, wherein the inlet opening / closing device and the outlet opening / closing device are locked during replacement by rotating the oil filter in order to open or block the oil inlet and oil flow path.

[0012] An oil-cooled drive motor according to an embodiment of the present invention comprises a housing that accommodates components and has an oil flow path through which a coolant flows to cool the components, a filter housing formed on the housing, and a replaceable oil filter that is exchangeably coupled to the filter housing to filter foreign substances in the coolant, wherein the filter housing comprises a filter insert chamber configured to securely receive the oil filter, an oil inlet configured to connect the filter insert chamber to an outlet side of the oil flow path to supply oil to the filter insert chamber, an oil drain pipe configured to be connected to an inlet side of the oil flow path to return oil filtered by the oil filter to the oil flow path, and projecting towards the filter insert chamber, and an opening / closing flap.which is provided on an inner surface of the filter insertion chamber and is designed to seal the oil inlet by moving to one side in a circumferential direction and to open the oil inlet by moving to the other side in a circumferential direction.

[0013] Furthermore, the oil filter is configured to be inserted into the filter housing along an axial direction and then to be held or released by rotation, and comprises a cylindrical filter body configured to filter the oil supplied to the filter housing as the oil moves radially inward to a hollow section of the filter body, the filter body comprising a first-first drive projection formed circumferentially on one side and a first-second drive projection spaced apart on the other side, both formed around an axial outer circumference of the filter body and projecting radially outward, and wherein, upon insertion of the replaceable oil filter into the filter housing, the first-first drive projection and the first-second drive projection are configured to fit between the circumferential ends of the opening / closing flap, thereby causingthat the opening / closing flap moves back and forth in the circumferential direction in conjunction with the rotation of the replaceable oil filter during holding or release.

[0014] Furthermore, the opening / closing flap is designed to open the oil inlet when the replaceable oil filter is held in place and to seal the oil inlet when the replaceable oil filter is released, whereby the replaceable oil filter is held in the filter insertion chamber by turning it to one side in the circumferential direction and released from the filter insertion chamber by turning it to the other side in the circumferential direction.

[0015] Furthermore, the inner surface of the filter insertion chamber has a first rail groove that is recessed radially outwards along the circumferential direction and is designed to guide the circumferential movement of the first-first drive projection and the first-second drive projection, and a second rail groove that is recessed radially outwards along the axial direction and is designed to guide the axial movement of the first-first drive projection and the first-second drive projection.

[0016] Furthermore, the opening / closing flap is designed as a plate with an arcuate cross-section, which is designed to slide along the inner surface of the filter insertion chamber, and includes a first rail projection on the outer circumferential surface of the opening / closing flap, which is formed along the circumferential direction and projects radially outwards to be inserted into the first rail groove.

[0017] Furthermore, the first-first drive projection and the first-second drive projection are formed on the axial outside of the filter body, and a second-first drive projection and a second-second drive projection are formed at a certain distance in the axial direction inwards from the first-first drive projection and the first-second drive projection of the filter body.

[0018] Furthermore, the filter insertion chamber includes a stop that projects radially inwards and is designed to rest against a circumferential end on one side of the opening / closing flap to prevent further movement in a circumferential direction when the opening / closing flap seals the oil inlet.

[0019] Furthermore, the oil-cooled drive motor also includes an outlet opening / closing device designed to open or close the inlet side of the oil drain pipe.

[0020] Furthermore, the oil-cooled drive motor also includes an outlet opening / closing device at one end of the oil drain pipe, which is configured to open or close the oil drain pipe, wherein the outlet opening / closing device includes a rubber sealing section which is configured to close the oil drain pipe under normal conditions and to open it when pressurized, and the replaceable oil filter further includes a pressure projection which is configured to press on the outlet opening / closing device during an axial inward movement for installation and to release the pressure on the outlet opening / closing device during an axial outward movement for removal. Brief description of the drawings Fig. Figure 1 is a perspective cross-sectional view showing an oil filter housing and an oil flow path of a drive motor coupled to an oil filter according to an embodiment of the present invention; Fig. Figure 2 is a perspective cross-sectional view showing an oil filter housing, an oil flow path and an inlet opening / closing device of a drive motor coupled to an oil filter according to an embodiment of the present invention; Fig. Figure 3 is a perspective cross-sectional view showing an oil filter housing according to an embodiment of the present invention; Fig. 4A and Fig. Figures 4B are perspective front and rear views of an opening / closing flap according to an embodiment of the present invention; Fig. Figure 5 is a perspective cross-sectional view showing an oil filter housing coupled to an opening / closing flap according to an embodiment of the present invention; Fig. Figure 6 is a perspective cross-sectional view showing an oil filter housing with an oil inlet sealed by an opening / closing flap according to an embodiment of the present invention; Fig. Figure 7 is a perspective view of an oil filter with an inlet opening / closing device according to an embodiment of the present invention; Fig. Figure 8 is a perspective cross-sectional view of an oil filter housing with an outlet opening / closing device according to an embodiment of the present invention; Fig. Figure 9 is a perspective cross-sectional view of an oil filter according to an embodiment of the present invention; and Fig. Figure 10 is a perspective cross-sectional view showing the opening / closing mechanism of an outlet opening / closing device due to the coupling of an oil filter housing and an oil filter according to an embodiment of the present invention. Detailed description of the invention

[0021] An embodiment of the present invention is described in detail below with reference to the drawings.

[0022] Fig. Figure 1 is a perspective cross-sectional view showing an oil filter housing 200 and an oil flow path 110 on a housing 100 of a drive motor coupled to an oil filter 300 according to an embodiment of the present invention.

[0023] As shown, the oil-cooled drive motor 1000 according to an embodiment of the present invention comprises a housing 100 which accommodates a stator and a rotor of the drive motor, and a filter housing 200 which is formed integrally with the housing 100 and accommodates an oil filter 300.

[0024] The housing 100 has an oil flow path 110 through which a coolant flows to cool the components, and a filter housing 200 for coupling the oil filter 300 can be formed integrally with the housing 100.

[0025] The filter housing 200 is cylindrical, with a filter insert chamber 250 formed within it. An inner end is sealed by the housing 100, while the outer end is open. An oil drain pipe 210 can project outwards from the center of the inner end of the filter housing 200. The upstream side of the oil drain pipe 210 is connected to the inlet side of the oil flow path 110 to supply filtered oil from the oil filter 300 to the oil flow path 110. Furthermore, the filter housing 200 has an oil inlet 220 (see Fig. 4) for introducing oil into the oil filter 300, and the oil inlet 220 can be connected to the outlet side formed at the end of the oil flow path 110.

[0026] The oil filter 300 comprises a cylindrical filter body 310 and a filter cap 320 provided at the outer end of the filter body 310, which seals the open side of the filter housing 200 and secures the filter body 310 to the filter housing 200. The filter body 310 and the filter cap 320 can be formed as a single piece or separately, as in this embodiment. The filter body 310 can be a hollow cylinder along its longitudinal direction, with the oil drain pipe 210 passing through the inner end of the hollow section and draining oil through the oil drain pipe 210 into the oil flow path 110. Thus, the oil introduced into the filter housing 200 through the oil inlet 220 is filtered by the filter body 310, flows into the radially inner hollow section of the filter body 310, and is returned to the inlet side of the oil flow path 110 through the oil drain pipe 210.

[0027] Fig. Figure 2 is a perspective cross-sectional view showing an oil filter housing 200, an oil flow path 110 and an inlet opening / closing device 600, 710 and 720 of a drive motor coupled to an oil filter 300 according to an embodiment of the present invention.

[0028] As shown, the drive motor further comprises an inlet opening / closing device 600, 710 and 720 for opening or closing the oil inlet 220 (see Fig. 3), which is formed on the filter housing 200. The inlet opening / closing device comprises an opening / closing flap 600, which is provided on the inner circumferential surface of the filter insertion chamber 250 and moves back and forth in the circumferential direction, as well as first and second drive projections 710 and 720, which are provided on the filter body 310 to displace the opening / closing flap 600 in the circumferential direction during the axial rotation of the oil filter 300 for replacement.

[0029] The oil filter 300 is inserted axially into the filter housing 200 and rotated circumferentially by a specific angle to secure it during installation. During removal, the oil filter 300 is rotated in the opposite direction by a specific angle to release the clamp and then moved axially to separate it from the filter housing 200. The first and second drive projections 710 and 720 on the filter body 310 actuate the opening / closing flap 600. As the oil filter 300 rotates by a specific angle, the opening / closing flap 600 slides along with the oil filter 300, thus opening or sealing the oil inlet 220.

[0030] The inlet opening / closing device 600, 710 and 720 according to an embodiment of the present invention with the above configuration is described in more detail with reference to the drawings.

[0031] Fig. Figure 3 is a perspective cross-sectional view showing the inner surface of the filter insertion chamber 250 of an oil filter housing 200 according to an embodiment of the present invention.

[0032] As shown, the inner surface of the filter insert chamber 250 has an oil inlet 220 connected to the downstream side of the oil flow path 110 to supply the filter insert chamber 250 with oil. Furthermore, an oil drain pipe 210 can project from the inner center of the filter insert chamber 250 towards the filter insert chamber 250 and connected to the upstream side of the oil flow path 110 to supply filtered oil to the oil flow path 110. The inner surface of the filter insert chamber 250 can also have first rail grooves 251 and 252 that guide the sliding movement of the opening / closing flap 600 and the circumferential movement of the first and second drive projections 710 and 720.The first rail grooves 251 and 252 are formed along the circumferential direction and consist of a first-first rail groove 251, which is formed on the outside, and a first-second rail groove 252, which is spaced inwards from the first-first rail groove 251. The first rail grooves 251 and 252 can be recessed radially outwards from the inner surface of the filter insertion chamber 250.

[0033] Furthermore, the inner surface of the filter insertion chamber 250 can have a second rail groove 253, which is designed to guide the axial movement of the first and second drive projections 710 and 720. The second rail groove 253 is formed along the axial direction and can be recessed radially outwards from the inner surface of the filter insertion chamber 250.

[0034] The oil inlet 220 can be formed between the first-first rail groove 251 and the first-second rail groove 252.

[0035] If the opening / closing flap 600 seals the oil inlet 220 by moving to one side and opens it by moving to the other side, a stop 230 can also be formed at a position corresponding to the circumferential end of the opening / closing flap 600 to prevent further movement in the sealed state. The stop 230 projects radially inward from the inner surface of the filter insert chamber 250 and can extend along the axial direction.

[0036] Fig. 4A and Fig. Figures 4B are a perspective front and rear view of the opening / closing flap 600 of the present invention.

[0037] As shown, the opening / closing flap 600 can be a plate with an arcuate cross-section that slides on the inner surface of the filter insertion chamber 250. Furthermore, a first rail projection 610 can be formed on the outer surface in the longitudinal direction of the outer circumferential surface of the opening / closing flap 600, and a second rail projection 620 can be formed on the inner surface. The first and second rail projections 610, 620 project radially outwards, and when the opening / closing flap 600 rests on the inner surface of the filter insertion chamber 250, the first rail projection 610 is inserted into the first-first rail groove 251 and the second rail projection 620 into the first-second rail groove 252. Thus, the opening / closing flap 600 is configured to move smoothly along its circumference.

[0038] Fig. Figure 5 is a perspective cross-sectional view showing an oil filter housing coupled to an opening / closing flap 600 according to an embodiment of the present invention, and Fig. Figure 6 is a perspective cross-sectional view showing an oil filter housing 200, wherein the oil inlet 220 is sealed by the opening / closing flap 600 according to an embodiment of the present invention.

[0039] As shown, the opening / closing flap 600 is coupled to the inner surface of the filter insertion chamber 250 and slides along the circumferential direction. The axially outer end of the opening / closing flap 600 has the first rail projection 610, which is inserted into the first-first rail groove 251 to slide in the circumferential direction, and the second rail projection 620 is inserted into the first-second rail groove 252 to slide in the circumferential direction.

[0040] As in Fig. As shown in Figure 5, the oil inlet 220 also opens to the other side during circumferential movement, and as shown in Fig. As shown in Figure 6, the oil inlet 220 is sealed to one side during circumferential movement. The opening / closing flap 600 is also configured by the stop 230 to prevent release in one direction while the oil inlet 220 is sealed.

[0041] One side of the oil filter can be the release rotation direction, and the other side can be the locking rotation direction. When the oil filter is rotated to one side for removal, the opening / closing flap 600 moves to that side and seals the oil inlet 220 to prevent oil from escaping through the oil flow path 110. When the oil filter is rotated to the other side for installation, the opening / closing flap 600 moves to that side and opens the oil inlet 220, allowing oil to enter the filter housing 250 through the oil flow path 110.

[0042] Fig. Figure 7 is a perspective view showing an oil filter 300 with an inlet opening / closing device 710 and 720 according to an embodiment of the present invention.

[0043] As shown, the filter body 310 of the oil filter 300 comprises first and second drive projections 710 and 720 to move the opening / closing flap 600 in conjunction with the rotation of the oil filter 300.

[0044] The first drive projection 710 is arranged axially around the outer circumference of the filter body 310 and can project radially outwards. The first drive projection 710 comprises a first-first drive projection 710-1, which is formed circumferentially on one side, and a first-second drive projection 710-2, which is spaced apart on the other side. The first drive projection 710 is inserted into the second rail groove 253 and moves along it during an axial movement to install the oil filter 300. After completion of the axial movement, the circumferential ends of the opening / closing flap 600 are fitted between the first-first drive projection 710-1 and the first-second drive projection 710-2.

[0045] During rotation of the oil filter 300, the opening / closing flap 600, fitted between the first drive projection 710-1 and the first drive projection 710-2, slides circumferentially. The first drive projection 710 can be configured to slide in the first rail groove 251 during rotation of the oil filter 300.

[0046] The second drive projection 720 is formed axially inside the filter body 310 and can project radially outwards. The second drive projection 720 comprises a second-first drive projection 720-1, which is formed circumferentially on one side, and a second-second drive projection 720-2, which is spaced apart on the other side. The second drive projection 720 is inserted into the second rail groove 253 and moves along it during the axial movement for the installation of the oil filter 300. After completion of the axial movement, the circumferential ends of the opening / closing flap 600 are fitted between the second-first drive projection 720-1 and the second-second drive projection 720-2.

[0047] During rotation of the oil filter 300, the opening / closing flap 600, located between the second-first drive projection 720-1 and the second-second drive projection 720-2, slides circumferentially. The second drive projection 720 can be configured to slide in the first-second rail groove 252 during rotation of the oil filter 300.

[0048] Fig. Figure 8 is a perspective cross-sectional view showing an oil filter housing 200 with an outlet opening / closing device 800 according to an embodiment of the present invention.

[0049] As shown, the filter housing 200 is cylindrical, with a filter insert chamber 250 formed inside, an inner end sealed by the housing 100, and an outer end open. An oil drain pipe 210 can project axially outwards from the center of the inner end of the filter housing 200, and the oil drain pipe 210 is connected, as described above, to the inlet side of the oil flow path 110 to supply oil from the filter cavity section, which has been filtered by the oil filter 300, to the oil flow path 110.

[0050] At this point, the outlet opening / closing device 800 is provided at the inlet-side end of the oil drain pipe 210 to open or close the inlet-side end of the oil drain pipe 210. The outlet opening / closing device 800 is made of rubber material and seals the oil drain pipe 210 under normal conditions, and may have a rubber sealing structure that opens when pressurized.

[0051] Fig. Figure 9 is a perspective cross-sectional view showing an oil filter 300 according to an embodiment of the present invention, and Fig. Figure 10 is a perspective cross-sectional view showing the opening / closing mechanism of the outlet opening / closing device 800 due to the coupling of the filter housing 200 and the oil filter 300 according to an embodiment of the present invention.

[0052] As shown, the oil filter 300 has the following configuration to push and open the outlet opening / closing device 800.

[0053] The oil filter 300 consists of a cylindrical filter body 310 and a filter cap 320 at the outer end of the filter body 310, which seals the open side of the filter housing 200 and secures the filter body 310 to the filter housing 200. The filter body 310 includes an upper cover 311 formed on its axial inner surface and a connecting frame 312 for connecting the upper cover 311 to the filter cap 320. A hollow section 315, through which the oil drain pipe 210 passes, may be formed in the upper cover 311. A pressure projection 340 may be formed on the connecting frame 312 to press and open the outlet opening / closing device 800 when the oil filter 300 is installed and the oil drain pipe 210 is inserted into the hollow section 315 of the upper cover 311.The pressure projection 340 is located in the axial center of the connecting frame 312, which is formed along the axial direction, and its axial outer end can be attached to the connecting frame 312.

[0054] If, as in Fig. 9 and Fig. As shown in Figure 10, when the oil filter 300 is moved inwards in the axial direction for installation, the pressure projection 340 presses on the outlet opening / closing device 800 to open it; when the oil filter 300 moves outwards in the axial direction for removal, the pressure projection 340 releases from the outlet opening / closing device 800, so that the outlet opening / closing device 800 can seal the oil drain pipe 210 due to its elasticity.

[0055] The oil-cooled drive motor with an oil filter according to the present invention with the above configuration is advantageous because it prevents oil from escaping from the oil flow path into the oil filter insertion chamber by blocking the oil inlet and the oil flow path during the oil filter change.

[0056] Furthermore, the oil-cooled drive motor with an oil filter according to the present invention is advantageous because it prevents oil waste, simplifies the filter change process and reduces working time, since leaked oil no longer needs to be completely drained before changing the filter and subsequently refilling the oil.

[0057] Furthermore, the oil-cooled drive motor with an oil filter according to the present invention is advantageous in order to further simplify the filter change process and reduce working time by enabling the opening or closing of the oil flow path in conjunction with the rotation of the oil filter during the change, without the need for a separate process or device.

[0058] The technical concept of the present invention is not limited to the embodiments described above. Its scope of application is diverse, and those skilled in the field can make various modifications without departing from the core of the invention claimed in the claims. Therefore, such improvements and modifications fall within the scope of protection of the present invention, provided they are obvious to those skilled in the field. Description of the reference symbols 1000 drive motor 100 cases 110 Oil flow path 200 filter housings 210 Oil drain pipe 220 Oil inlet 230 stop 250 filter insertion space 251 first-first rail groove 252 first-second rail groove 253 second rail groove 300 oil filters 310 filter bodies 311 upper cover 312 Connecting frames 315 hollow section 320 filter cap 340 pressure advantage 600 Opening / Closing Flap 610 first rail projection 620 second rail projection 710 first drive advantage 720 second drive advantage 800 Outlet opening / closing device QUOTES INCLUDED IN THE DESCRIPTION

[0000] This list of documents cited by the applicant was automatically generated and is included solely for the reader's convenience. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions. Cited patent literature

[0000] KR 10-2024-0134737

[0001]

Claims

[1] Oil-cooled drive motor, comprising: a housing that accommodates components and has an oil flow path through which a coolant flows to cool the components; a filter housing formed on the housing; and a replaceable oil filter that is interchangeably coupled with the filter housing to filter foreign substances in the coolant, the filter housing includes: a filter insertion chamber designed to securely hold the oil filter; an oil inlet designed to connect the filter insertion chamber to an outlet side of the oil flow path in order to supply oil to the filter insertion chamber; an oil drain pipe designed to be connected to an inlet side of the oil flow path in order to return oil filtered through the oil filter to the oil flow path, and projecting towards the filter insertion chamber; and an opening / closing flap provided on an inner surface of the filter insertion chamber and designed to seal the oil inlet by moving to one side in a circumferential direction and to open the oil inlet by moving to the other side in a circumferential direction. [2] Oil-cooled drive motor according to claim 1, wherein the replaceable oil filter is configured to be inserted into the filter insertion chamber along an axial direction and then to be held or released by rotation, and comprises a cylindrical filter body configured to filter the oil supplied to the filter insertion chamber while the oil moves radially inward to a hollow section of the filter body, wherein the filter body comprises a first-first drive projection formed on one side in the circumferential direction and a first-second drive projection spaced apart on the other side, both formed around an axial outer circumference of the filter body and projecting radially outward, and wherein, when the replaceable oil filter is inserted into the filter insertion chamber, the first-first drive projection and the first-second drive projection are configured toto fit between the circumferential ends of the opening / closing flap, causing the opening / closing flap to move back and forth in the circumferential direction in conjunction with the rotation of the replaceable oil filter during holding or release. [3] Oil-cooled drive motor according to claim 2, wherein the opening / closing flap is configured to open the oil inlet when the replaceable oil filter is held in place and to seal the oil inlet when the replaceable oil filter is released, wherein the replaceable oil filter is held in the filter insertion chamber by rotation to one side in the circumferential direction and is released from the filter insertion chamber by rotation to the other side in the circumferential direction. [4] Oil-cooled drive motor according to claim 2 or 3, wherein the inner surface of the filter insertion chamber comprises: a first rail groove, which is recessed radially outwards along the circumferential direction and is designed to guide the circumferential movement of the first-first drive projection and the first-second drive projection; and a second rail groove, which is recessed radially outwards along the axial direction and is designed to guide the axial movement of the first-first drive projection and the first-second drive projection. [5] Oil-cooled drive motor according to claim 4, wherein the opening / closing flap is designed as a plate with an arcuate cross-section, which is configured to slide along the inner surface of the filter insertion chamber, and comprises a first rail projection on the outer circumferential surface of the opening / closing flap, which is formed along the circumferential direction and projects radially outwards to be inserted into the first rail groove. [6] Oil-cooled drive motor according to claim 4 or 5, wherein the first-first drive projection and the first-second drive projection are formed on the axial outside of the filter body and a second-first drive projection and a second-second drive projection are formed at a certain distance in the axial direction inwards from the first-first drive projection and the first-second drive projection of the filter body. [7] Oil-cooled drive motor according to any one of claims 2 to 6, wherein the filter insertion chamber comprises a stop which projects radially inwards and is configured to bear against a circumferential end on one side of the opening / closing flap to prevent further movement in a circumferential direction when the opening / closing flap seals the oil inlet. [8] Oil-cooled drive motor according to any one of claims 1 to 7, further comprising an outlet opening / closing device configured to open or close the inlet side of the oil drain pipe. [9] Oil-cooled drive motor according to claim 8, further comprising an outlet opening / closing device at one end of the oil drain pipe, which is configured to open or close the oil drain pipe, wherein the outlet opening / closing device comprises a rubber sealing section which is configured to close the oil drain pipe under normal conditions and to open it when pressurized, and the replaceable oil filter further comprises a pressure projection which is configured to press on the outlet opening / closing device during an axial inward movement for installation and to release the pressure on the outlet opening / closing device during an axial outward movement for removal.

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