CN113738841A

CN113738841A - Drive device

Info

Publication number: CN113738841A
Application number: CN202010467997.7A
Authority: CN
Inventors: 松崎良亮; 三木孝广; 中松修平; 藤原久嗣; 田中公瑛
Original assignee: Nidec Corp
Current assignee: Nidec Corp
Priority date: 2020-05-28
Filing date: 2020-05-28
Publication date: 2021-12-03

Abstract

An embodiment of the present application provides a drive device that rotates an axle of a vehicle, including: a motor; a reduction gear connected to the motor; a housing having a motor housing portion in which a motor is housed and a gear housing portion in which a reduction gear is housed, at least one of the motor housing portion and the gear housing portion housing oil; and a ventilation part arranged on the shell, wherein the ventilation part is provided with a convex part protruding towards the interior of the shell and a ventilation hole part positioned in the convex part and communicating the interior and the exterior of the shell; wherein, this drive arrangement still has: a cover fixed to the projection and covering the opening of the vent; either the lid or the projection has a claw portion that engages with the other of the lid and the projection. According to the embodiment of the application, the cover part is arranged to prevent oil from flowing into the vent hole part, the convex part and the cover part are fixed in a clamping mode, bolts are not needed for fixing, and the number of parts is reduced.

Description

Drive device

Technical Field

The embodiment of the application relates to the field of electromechanics, in particular to a driving device.

Background

Currently, a structure of a vent hole is installed in a housing of a driving device. However, oil accumulated in the bottom of the casing may enter the vent hole due to vehicle vibration or the like. Therefore, when the pressure in the casing is released, there is a possibility that the oil is ejected.

In order to prevent oil from flowing into the vent member, a structure is disclosed in which a case is provided below a pipe of the vent member, and the case is fixed by a bolt of a bracket. However, this configuration increases the number of parts and increases the man-hours for assembly.

It should be noted that the above background description is only for the convenience of clear and complete description of the technical solutions of the present application and for the understanding of those skilled in the art. Such solutions are not considered to be known to the person skilled in the art merely because they have been set forth in the background section of the present application.

Disclosure of Invention

In order to solve at least one of the above problems or other similar problems, embodiments of the present application provide a driving apparatus in which a cap is provided to prevent oil from flowing into a vent portion, and a protrusion and the cap are fixed by a snap-fit manner, so that bolt fixation is not required, and the number of parts is reduced.

According to an aspect of an embodiment of the present application, there is provided a driving device that rotates an axle of a vehicle, wherein the driving device has:

a motor;

a reduction gear connected to the motor;

a housing having a motor housing portion that houses the motor therein and a gear housing portion that houses the reduction gear therein, at least one of the motor housing portion and the gear housing portion housing oil therein; and

a vent portion provided in the case, the vent portion having a convex portion protruding into the case and a vent portion located inside the convex portion and communicating the inside and the outside of the case;

wherein the driving device further has:

a cover fixed to the projection and covering the opening of the vent;

one of the lid and the convex portion has a claw portion that engages with the other of the lid and the convex portion.

In some embodiments of the present invention, the,

the cover portion has the claw portion disposed opposite to the opening of the vent portion;

the claw portion is engaged with the opening of the vent portion so that the cover portion and the convex portion are fixed together;

at least a part between the claw portion and the inner peripheral surface of the vent portion has a clearance.

In some embodiments, at least a portion of the half inner peripheral surface of the vent portion located below in the gravity direction has a clearance with the claw portion.

In some embodiments, a gap is provided between a gravity direction lower side of the claw portion and an inner peripheral surface of the vent portion.

In some embodiments, the jaw portion has a bevel.

In some embodiments of the present invention, the,

the cover portion has a plate-like base and side portions extending from both ends of the base toward the convex portion,

the side portion of the cover portion is opposed to the opening of the vent portion and is fixed to the projection portion by the claw portion;

either one of the convex portion and the base of the cover portion has a positioning pin portion,

the other of the convex portion and the base of the cover portion has a positioning hole portion for receiving the positioning pin portion.

In some embodiments, the base of the cover has the positioning pin portion, and reinforcing ribs are provided on an outer periphery of the positioning pin portion.

In some embodiments, the vent and the housing are formed separately.

In some embodiments of the present invention, the,

the housing further has: an inverter housing portion for housing an inverter and a window portion penetrating the housing;

an electrical connection point to which the motor and the inverter are connected is further disposed at a position opposed to the window portion inside the case,

the ventilation portion further has: a top plate portion that covers the window portion, the convex portion protruding from the top plate portion toward the inside of the housing.

In some embodiments, the cover portion and the vent portion are further secured together by bolts.

In some embodiments, the claw portion is engaged with a position not opposed to the opening of the vent portion, and the convex portion and the cover portion are fixed by the claw portion.

One of the beneficial effects of the embodiment of the application lies in: the cover portion prevents oil from flowing into the vent portion, and the convex portion and the cover portion are fixed by a snap-fit manner, so that the number of parts is reduced without using bolts for fixing.

Specific embodiments of the present application are disclosed in detail with reference to the following description and drawings, indicating the manner in which the principles of the application may be employed. It should be understood that the embodiments of the present application are not so limited in scope. The embodiments of the application include many variations, modifications and equivalents within the spirit and scope of the appended claims.

Drawings

The accompanying drawings, which are included to provide a further understanding of the embodiments of the application, are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the principles of the application. It is obvious that the drawings in the following description are only some embodiments of the application, and that for a person skilled in the art, other drawings can be derived from them without inventive effort. In the drawings:

fig. 1 is an external view schematically showing a driving apparatus according to an embodiment of the present application;

FIG. 2 is a schematic view of a vent portion of an embodiment of the present application;

FIG. 3 is another schematic view of a vent portion of an embodiment of the present application;

FIG. 4 is a schematic view of the vent and cap portions of an embodiment of the present application;

FIG. 5 is another schematic view of the vent and cap portions of an embodiment of the present application;

FIG. 6 is a schematic view of the vent portion disposed in the top wall portion of the housing;

FIG. 7 is a schematic view of the vent portion disposed in the sidewall portion of the housing;

FIG. 8 is yet another schematic view of the vent and cap portions of an embodiment of the present application;

FIG. 9 is a schematic view of the vent portion and the jaw portion;

FIG. 10 is another schematic view of the vent portion and the jaw portion;

FIG. 11 is yet another schematic view of the vent and cap portions of an embodiment of the present application;

FIG. 12 is a schematic view of a cover portion of an embodiment of the present application;

FIG. 13 is yet another schematic view of a vent portion of an embodiment of the present application;

fig. 14 is a schematic view of an example of fixing a cover portion by bolts;

fig. 15 is a schematic view of another example of fixing the cover portion by bolts;

FIG. 16 is a schematic view showing the claw portion not engaged with the opening of the vent portion.

Detailed Description

The foregoing and other features of the present application will become apparent from the following description, taken in conjunction with the accompanying drawings. In the description and drawings, particular embodiments of the application are disclosed in detail as being indicative of some of the embodiments in which the principles of the application may be employed, it being understood that the application is not limited to the described embodiments, but, on the contrary, is intended to cover all modifications, variations, and equivalents falling within the scope of the appended claims.

In embodiments of the present application, the term "and/or" includes any and all combinations of one or more of the associated listed terms. The terms "comprising," "including," "having," and the like, refer to the presence of stated features, elements, components, and do not preclude the presence or addition of one or more other features, elements, components, and elements.

In the embodiments of the present application, the singular forms "a", "an", and the like may include the plural forms and should be interpreted broadly as "a" or "an" and not limited to the meaning of "a" or "an"; furthermore, the term "comprising" should be understood to include both the singular and the plural, unless the context clearly dictates otherwise. Further, the term "according to" should be understood as "at least partially according to … …," and the term "based on" should be understood as "based at least partially on … …," unless the context clearly dictates otherwise.

In the embodiments of the present application, a lower side in the direction of gravity is referred to as a lower side or a lower side, and a direction opposite to the lower side or the lower side is referred to as an upper side or an upper side. It should be noted, however, that these are for convenience of illustration only and do not limit the orientation of the drive device during use and manufacture.

Embodiments of the present application will be described below with reference to the drawings.

Embodiments of the first aspect

The embodiment of the application provides a driving device.

Fig. 1 is an external view of a driving device according to an embodiment of the present application. As shown in fig. 1, the driving device of the embodiment of the present application includes: the reduction gear unit 20 is connected to the motor 10, the case 30 includes a motor housing portion 31 that houses the motor 10 therein and a gear housing portion 32 that houses the reduction gear unit 20 therein, oil is housed in at least one of the motor housing portion 31 and the gear housing portion 32, and the ventilation portion 40 is provided in the case 30, and is configured to allow air to pass between the inside and the outside of the case 30, thereby adjusting the pressure inside the case 30.

Fig. 2 is a schematic view of the vent part 40 according to the embodiment of the present application, and as shown in fig. 2, the vent part 40 has a protrusion 41 protruding toward the inside of the housing 30. Fig. 3 is another schematic view of the vent portion 40 of the embodiment of the present application, showing the internal configuration of the vent portion 40, and as shown in fig. 3, the vent portion 40 further has a vent hole portion 42 located inside the convex portion 41 and communicating the inside and the outside of the housing 30, that is, the vent hole portion 42 is located inside the convex portion 41, which is a hole communicating the outside and the inside of the housing 30, having an opening 43 located inside the housing 30. The vent portion 42 also has an opening 43' located outside the housing 30.

In the embodiment of the present application, the driving device further has a cover 50, and fig. 4 is a schematic view of the vent portion 40 and the cover 50 of the embodiment of the present application, and as shown in fig. 4, the cover 50 is fixed to the convex portion 41 and covers the opening 43 of the vent portion 42 inside the housing 30. In the present embodiment, one of the lid 50 and the projection 41 has a claw portion that engages with the other of the lid 50 and the projection 41.

According to the above configuration, the cover 50 prevents oil from flowing into the vent hole 42, and the convex portion 40 and the cover 50 are fixed by engaging with each other, so that the number of parts is reduced without using bolts for fixing.

In some embodiments, the housing 30 has a top wall portion and a side wall portion, and the vent portion 42 is provided to the top wall portion, for example, the vent portion 42 may be a hole that opens on an upper side face of the top wall portion and an inner side face of the top wall portion to connect the inside and the outside of the housing 30. However, the present application is not limited thereto, and the vent portion 42 may be provided in the side wall portion.

Fig. 3 shows only one configuration of the vent portion 42, and as shown in fig. 3, the vent portion 42 may be T-shaped, and the present application is not limited thereto, and the vent portion 42 may have another configuration as long as the inside and the outside of the housing 30 can be communicated with each other.

In some embodiments, the vent portion 42 is a circular shaped hole, i.e., the cross-section of the vent portion 42 is circular. However, the present invention is not limited to this, and the vent portion 42 may be a hole having another shape, for example, a regular polygon in cross section.

In some embodiments, the cover 50 has a claw portion 51 that engages with the protrusion 41. Fig. 5 is another schematic view of the vent portion 40 and the cover portion 50 according to the embodiment of the present application, and as shown in fig. 5, the claw portion 51 and the opening 43 of the vent portion 42 are disposed to face each other; the claw portion 51 is engaged with the opening 43 of the vent portion 42 so that the lid portion 50 and the projection 41 are fixed together; at least a part between the claw portion 51 and the inner peripheral surface of the vent portion 42 has a clearance.

With this configuration, the vent hole 42 is used as an engagement portion with the claw 51, and thus, an engagement portion is not separately provided. Further, by providing a clearance between the claw portion 51 and the inner peripheral surface of the vent portion 42 (that is, the size of the outer peripheral surface of the claw portion 51 is smaller than the size of the inner peripheral surface of the vent portion 42), the function of the vent portion 42 to hold the inside and the outside of the housing 30 is ensured, and in the case where oil inadvertently enters the inside of the vent portion 42, the oil can be returned so that the oil inside the vent portion 42 can be returned to the inside of the housing 30.

Fig. 6 is a schematic view of the vent portion 40 provided in the top wall portion of the housing 30, and as shown in fig. 6, oil entering the interior of the vent portion 40 can be discharged through a gap G1 by a gap G1 between the claw portion 51 and the inner peripheral surface of the vent portion 42.

Fig. 7 is a schematic view of the vent portion 40 provided in the side wall portion of the housing 30, and as shown in fig. 7, the oil that has entered the interior of the vent portion 40 can be discharged from the gap G2 around the claw portion 51 by the action of gravity via the gap G2 between the claw portion 51 and the inner peripheral surface of the vent portion 42.

Fig. 8 is a further schematic view of the vent portion 40 and the cover portion 50 according to the embodiment of the present application, and as shown in fig. 8, the vent portion 40 is provided in the top wall portion of the housing 30, and a gap G3 is provided between at least a part of the half inner peripheral surface of the vent portion 42 below in the direction of gravity and the claw portion 51. Thereby, the oil flowing into the breather 40 can be returned into the housing. Further, since the position of the vent portion 40 is distant from the bottom of the case 30, the oil accumulated on the bottom of the case 30 is less likely to enter the inside of the vent portion 40, and even if it enters the inside of the vent portion 40, it can be discharged through the gap G3.

In some embodiments, the cross-sectional shape of the opening 43 of the vent portion 42 may be circular, and the cross-sectional shape of the claw portion 51 may be circular, but the present application is not limited thereto, and the cross-sectional shape of the claw portion 51 may also be a regular polygon, such as a square, or may also be a rectangle, or other irregular shapes.

In some embodiments, FIG. 9 is a schematic view of the vent portion 42 and the prong 51, illustrating an example where the cross-sectional shape of the opening 43 of the vent portion 42 is circular and the cross-sectional shape of the prong 51 is square. As shown in fig. 9, on both sides of the lower angle of the nail portion 51 in the direction of gravity (that is, the lower end of the nail portion 51), a gap G3 is provided between the nail portion 51 and the inner peripheral surface of the vent portion 42, that is, the gap G3 is not provided between the lower end of the nail portion 51 and the inner peripheral surface of the vent portion 42, but is provided between both sides of the lower end of the nail portion 51 and the inner peripheral surface of the vent portion 42, whereby the oil entering the inside of the vent portion 40 can be discharged through the gap G3.

Fig. 10 is another schematic view of the vent portion 42 and the claw portion 51, showing an example in which the cross-sectional shape of the opening 43 of the vent portion 42 is circular and the cross-sectional shape of the claw portion 51 is irregular, and in fig. 10, the lower end of the claw portion 51 in the direction of gravity is arc-shaped and contacts the inner peripheral surface of the vent portion 42. As shown in fig. 10, similarly to the example of fig. 9, the gap G3 is located between both sides of the lower end of the nail part 51 and the inner peripheral surface of the vent part 42, whereby the oil that has entered the inside of the vent part 40 can also be discharged through the gap G3.

Fig. 11 is still another schematic view of the breather portion 40 and the cover portion 50 of the embodiment of the present application, and as shown in fig. 11, in some embodiments, a gap G4 is provided between the lower side of the claw portion 51 in the direction of gravity and the inner peripheral surface of the breather portion 42, whereby the oil in the breather portion 42 can be returned to the inside of the housing 30 more reliably.

In some embodiments, the pawl 51 has a bevel.

Fig. 12 is a schematic view of the cover portion 50 according to the embodiment of the present application, and as shown in fig. 12, in some embodiments, the claw portion 51 is located on the cover portion 50, and a surface of the claw portion 51 opposite to the convex portion 41 is an inclined surface which is close to the convex portion 41 along a protruding direction of the convex portion 41. Thus, the lid 50 is pushed in from below the convex portion 41, the claw portion 51 is fitted into the convex portion 41, and the surface of the claw portion 51 facing the convex portion 41 is formed as a slope, so that the lid 50 is not subjected to an excessive stress, and the convex portion 41 can be smoothly pushed in along the slope. In addition, when the claw portion 51 is located at the convex portion 41, it may similarly have a slope structure, and will not be described here.

In some embodiments, as shown in fig. 12, the cover 50 has a plate-shaped base 52 and side portions 53 extending from both ends of the base 52 toward the convex portion 41, and the side portions 53 of the cover 50 are opposed to the openings of the vent portions 42 and are fixed to the convex portion 41 by the claw portions 51.

In some embodiments, either one of the convex portion 41 and the base 52 of the cover 50 has a positioning pin portion, and the other one of the convex portion 41 and the base 52 of the cover 50 has a positioning hole portion that receives the positioning pin portion.

Fig. 13 is a further schematic view of the venting portion 40 according to the embodiment of the present invention, and as shown in fig. 12 and 13, in one embodiment, the base 52 of the cover 50 has a positioning pin portion 54, and the protruding portion 41 has a positioning hole portion 44 for receiving the positioning pin portion 54. However, the present invention is not limited to this, and as described above, the positioning pin portion 54 may be formed on the convex portion 41, and the positioning hole portion 44 that receives the positioning pin portion 54 may be provided in the base 52 of the cover portion 50.

With this structure, since the lid 50 is likely to swing like a swing by engaging and fixing the claw portions 51 and the vent holes 52, the positioning pin portions are provided at least one of the lower ends of the convex portions 41 and the lid 50 at the opposite positions, and the positioning holes are provided at the other side of either one of the lower ends and the opposite positions to prevent rotation.

In some embodiments, as shown in fig. 12, the base 52 of the cover 50 has a positioning pin portion 54, and a reinforcing rib 55 is provided on the outer periphery of the positioning pin portion 54. By providing the long side portions 53 in the vertical direction, the bent portion of the cover portion 50 can be prevented from receiving excessive stress, but in this case, since the positioning pin portions 54 become long, excessive stress is applied to the positioning pin portions 54, and there is a possibility of deformation. Therefore, the positioning pin 54 is provided with the reinforcing rib 55, and deformation of the positioning pin 54 can be prevented.

In some embodiments, the vent 40 and the housing 30 are formed separately. Thus, when the vent 40 and the case 30 are not one member, the cover 50 can be fixed to the convex portion outside the case 30. That is, since the fixing can be performed without being affected by the size of the working space in the housing 30, the freedom of design is achieved, and the workability of the work is improved.

In some embodiments, as shown in fig. 1, the housing 30 further has: an inverter housing portion 33 housing an inverter; the housing 30 further has: a window 34, the window 34 penetrating the housing 30; an electrical connection point (not shown) for connecting the motor 10 and the inverter is further disposed at a position facing the window portion 34 inside the case 30; as shown in fig. 1 and 2, the ventilation unit 40 further includes: and a top plate 45, wherein the top plate 45 covers the window 34, and the protrusion 41 protrudes from the top plate 45 toward the inside of the case 30.

According to the structure of the motor unit, in order to electrically connect the inverter and the motor, it is necessary to provide a window portion and a top plate portion. In the embodiment of the present application, by providing the top plate portion 45 in the ventilation portion 40, it is not necessary to additionally provide a window portion and a top plate portion in the motor housing 30, which improves the sealing performance and saves the number of parts.

In some embodiments, the cover 50 and the vent 40 may also be bolted together.

Fig. 14 and 15 are two examples of fixing the cover 50 by bolts, and as shown in fig. 14 and 15, by further fixing with bolts B, more firm fixing can be achieved.

In some embodiments, the cover portion 50 has a claw portion 51 disposed opposite to the convex portion 41; the claw portion 51 is engaged with a position not facing the opening 43 of the vent portion 42. Fig. 16 is a schematic view showing that the claw portions 51 are not engaged with the positions facing the openings 43 of the vent portions 42, and as shown in fig. 16, the protruding portions 41 and the cover 50 are fixed by the claw portions 51, and the claw portions 51 are not engaged with the positions facing the openings 43 of the vent portions 42. Thus, the claw portion 51 can be fixed to the convex portion 41 without being limited to the position of the opening 43 of the vent portion 42, and thus, the position of the convex portion 41 to be engaged with the claw portion 51 can be set as needed. The claw portion 51 may be provided on the convex portion 41 and engaged with a position not facing the opening 43 of the vent portion 42 as described above.

In the above embodiments, only the structures related to the driving device of the embodiments of the present application are described, the present application is not limited thereto, and the driving device may further include other structures, which may specifically refer to related technologies, and are not described herein again.

In the above embodiment, the cover portion is provided to prevent oil from flowing into the vent portion, and the convex portion and the cover portion are fixed by engagement, so that bolt fixation is not required, and the number of parts is reduced. In the case of using a bolt, the fixation reliability can be further improved.

In the embodiment of the application, the driving device can be used for an automobile traction system, an electric vehicle driving system and the like.

According to the embodiment of the application, the cover part is arranged to prevent oil from flowing into the vent hole part, the convex part and the cover part are fixed in a clamping mode, bolts are not needed for fixing, and the number of parts is reduced.

It is to be noted that the above is merely an exemplary description of the present application, but the present application is not limited thereto, and appropriate modifications may be made on the basis of the above respective embodiments. In addition, the above is only an exemplary description of each component, but the present application is not limited thereto, and the specific content of each component may also refer to the related art; it is also possible to add components not shown in the figures or to reduce one or more components in the figures.

The present application has been described in conjunction with specific embodiments, but it should be understood by those skilled in the art that these descriptions are intended to be illustrative, and not limiting. Various modifications and adaptations of the present application may occur to those skilled in the art based on the spirit and principles of the application and are within the scope of the application.

Preferred embodiments of the present application are described above with reference to the accompanying drawings. The many features and advantages of the embodiments are apparent from the detailed specification, and thus, it is intended by the appended claims to cover all such features and advantages of the embodiments that fall within the true spirit and scope thereof. Further, since numerous modifications and changes will readily occur to those skilled in the art, it is not desired to limit the embodiments of the present application to the exact construction and operation illustrated and described, and accordingly, all suitable modifications and equivalents may be resorted to, falling within the scope thereof.

Claims

1. A drive device that rotates an axle of a vehicle, wherein the drive device comprises:

a motor;

a reduction gear connected to the motor;

a ventilation portion provided in the case, the ventilation portion having a convex portion protruding into the case and a ventilation hole portion located inside the convex portion and communicating the inside and the outside of the case;

characterized in that the drive device further comprises:

a cover fixed to the projection and covering the opening of the vent;

2. The drive device according to claim 1,

3. The drive device according to claim 2,

at least a part of the half inner peripheral surface of the vent portion located below in the gravity direction has a gap with the claw portion.

4. The drive device according to claim 3,

a gap is provided between the lower side of the claw portion in the gravity direction and the inner peripheral surface of the vent portion.

5. The drive device according to any one of claims 1 to 4,

the claw portion has a slope.

6. The drive device according to any one of claims 1 to 4,

7. The drive device according to claim 6,

the base of the cover part is provided with the positioning pin part, and reinforcing ribs are arranged on the periphery of the positioning pin part.

8. The drive device according to any one of claims 1 to 4,

the vent portion and the housing are formed separately.

9. The drive device according to claim 8,

the housing further has: an inverter housing portion housing the inverter, and a window portion penetrating the housing,

10. The drive device according to any one of claims 1 to 4,

the cover portion and the vent portion are also secured together by bolts.

11. The drive device according to claim 1,

the claw portion is engaged with a position not facing the opening of the vent portion, and the protruding portion and the cover portion are fixed by the claw portion.