CN213990408U

CN213990408U - Driving device and electric product comprising same

Info

Publication number: CN213990408U
Application number: CN202022713403.4U
Authority: CN
Inventors: 村上俊辅
Original assignee: Nidec Corp
Current assignee: Nidec Corp
Priority date: 2020-11-20
Filing date: 2020-11-20
Publication date: 2021-08-17
Anticipated expiration: 2030-11-20

Abstract

The utility model provides a drive arrangement and including this drive arrangement's electric product. The drive device comprises a motor, a gearbox and at least two bearings comprising a first bearing and a second bearing. The motor has: a rotating shaft extending along a central axis; a motor main body disposed around the rotation shaft; and the first supporting part is positioned on one axial side of the motor main body, a gear is arranged in the gear box, the gear box is connected with the motor on one axial side of the motor, the first bearing and the second bearing support the rotating shaft, the first bearing is positioned on one axial side of the rotating shaft, and the first supporting part and the gear box limit the second bearing in the radial direction of the second bearing, so that the coaxiality of the motor and the gear box is improved.

Description

Driving device and electric product comprising same

Technical Field

The utility model relates to a drive arrangement field especially relates to a drive arrangement and including this drive arrangement's electric product.

Background

A conventional drive device includes a motor, a gear box, and a bearing for supporting a rotation shaft of the motor, and the bearing is positioned by the gear box.

It should be noted that the above background description is only for the sake of clarity and complete description of the technical solutions of the present invention, and is set forth for facilitating understanding of those skilled in the art. These 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 invention.

SUMMERY OF THE UTILITY MODEL

The inventors have found that, in the conventional technique, since the bearing is positioned only by the gear case in the radial direction, the accuracy of the alignment between the gear case and the motor is lowered, and the coaxiality between the gear case and the motor cannot be ensured.

In order to solve at least one of the above problems or other similar problems, embodiments of the present invention provide a driving device and an electric product including the same, which can improve the coaxiality of a gear box and a motor.

According to a first aspect of embodiments of the present invention, there is provided a drive arrangement, wherein the drive arrangement comprises a motor, a gear box and at least two bearings including a first bearing and a second bearing, the motor having: a rotating shaft extending along a central axis; a motor main body disposed around the rotation shaft; the first supporting part is located on one axial side of the motor main body, a gear is arranged in the gear box, the gear box is located on one axial side of the motor and connected with the motor, the first bearing and the second bearing support the rotating shaft, the first bearing is located on one axial side of the rotating shaft, and the first supporting part and the gear box are used for limiting the second bearing in the radial direction of the second bearing.

According to a second aspect of embodiments of the present invention, there is provided a drive device as defined in the first aspect, wherein the first bearing is located inside the gear case, and the first bearing and the second bearing are located on both axial sides with respect to the gear.

According to a third aspect of embodiments of the present invention, there is provided a driving device as defined in the first aspect, wherein the driving device further includes: and a second support portion located on one axial side of the first bearing, the second support portion including a cylindrical first wall portion and a first hollow portion located radially inward of the first wall portion, the first wall portion axially abutting against a radially outer edge of the first bearing, and an end portion of the rotating shaft located on one axial side being located in the first hollow portion.

According to a fourth aspect of embodiments of the present invention, there is provided the driving device as defined in the first aspect, wherein the first bearing is a rolling bearing.

According to a fifth aspect of embodiments of the present invention, there is provided the drive device as defined in the first aspect, wherein the gear case has a second wall portion and a second hollow portion located radially inside the second wall portion, the second wall portion axially abutting against the radially outer edge of the first bearing on the other axial side of the first bearing.

According to a sixth aspect of embodiments of the present invention, there is provided the driving device as defined in the first aspect, wherein the first bearing has a clearance in a radial direction with the gear case.

According to a seventh aspect of the embodiments of the present invention, there is provided the driving device as defined in the first aspect, wherein the first support portion has a first extension portion extending in the axial direction, the first extension portion is in interference fit with a first part outer peripheral surface of the second bearing, and the gear case has a third support portion in interference fit with a second part outer peripheral surface of the second bearing.

According to an eighth aspect of embodiments of the present invention, there is provided the drive device as defined in the first aspect, wherein an axial side of the second bearing has a clearance in an axial direction with the gear case.

According to a ninth aspect of embodiments of the present invention, there is provided the driving device as defined in the first aspect, wherein the driving device further includes: a shaft support portion located on the other axial side of the rotary shaft, the shaft support portion having a hole portion that receives an end portion of the other axial side of the rotary shaft, a center line of the hole portion, a center line of the first bearing, and a center line of the second bearing all coinciding with the center axis of the rotary shaft.

According to a tenth aspect of embodiments of the present invention, there is provided an electric product, wherein the electric product includes the driving device according to any one of the first to ninth aspects.

The embodiment of the utility model provides an one of the beneficial effect lies in: the first supporting part of the motor and the gear box limit the second bearing in the radial direction of the second bearing, so that the coaxiality of the gear box and the motor can be improved.

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

Features that are described and/or illustrated with respect to one embodiment may be used in the same way or in a similar way in one or more other embodiments, in combination with or instead of the features of the other embodiments.

Drawings

The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention. It is obvious that the drawings in the following description are only some embodiments of the invention, 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 a schematic view of a drive device according to an embodiment of the present invention;

fig. 2 is a cross-sectional view of a drive unit according to an embodiment of the present invention;

fig. 3 is a sectional view of a partial structure of a driving apparatus according to an embodiment of the present invention;

fig. 4 is another sectional view of a partial structure of a driving apparatus according to an embodiment of the present invention;

fig. 5 is another sectional view of a partial structure of a driving apparatus according to an embodiment of the present invention.

Detailed Description

The foregoing and other features of the invention will become apparent from the following description taken in conjunction with the accompanying drawings. In the description and drawings, particular embodiments of the invention have been disclosed in detail as being indicative of some of the embodiments in which the principles of the invention may be employed, it being understood that the invention 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 the embodiments of the present invention, the terms "comprises," "comprising," "includes," "including," "has," "having," or the like, refer to the presence of stated features, elements, components, but do not preclude the presence or addition of one or more other features, elements, components, or groups thereof.

In the embodiments of the present invention, the singular forms "a", "an", and the like 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 embodiment of the present invention, a direction parallel to a direction extending along the central axis of the motor is referred to as an "axial direction", a radial direction centering on the central axis is referred to as a "radial direction", and a direction around the central axis is referred to as a "circumferential direction". It should be noted that the definitions of the directions in the present specification are only for convenience of describing the embodiments of the present invention, and do not limit the directions of the driving device and the like in use and manufacture.

Example 1

The embodiment of the utility model provides a driving device. Fig. 1 is a schematic view of a driving device 10 according to an embodiment of the present invention, and fig. 2 is a cross-sectional view of the driving device 10 according to an embodiment of the present invention.

As shown in fig. 1 and 2, the driving device 10 includes a motor 11, a gear case 12, and at least two bearings including a first bearing 13 and a second bearing 14.

The motor 11 has: a rotating shaft 111, a motor main body 112, and a first support portion 113. The rotary shaft 111 extends along the central axis OO', the motor main body 112 is disposed around the rotary shaft 111, and the first support portion 113 is located on one axial side (left side as viewed in fig. 2) of the motor main body 112.

A gear 121 is provided in the gear case 12. The gear case 12 is connected to the motor 11 on one side in the axial direction of the motor 11.

The first bearing 13 and the second bearing 14 support the rotation shaft 111. The first bearing 13 is located on one axial side of the rotary shaft 111, and the first support portion 113 and the gear case 12 limit the position of the second bearing 14 in the radial direction of the second bearing 14.

In at least one embodiment, the coaxiality of the gear case 12 and the motor 11 can be improved by limiting the position of the second bearing 14 in the radial direction of the second bearing 14 by the first supporting portion 113 of the motor 11 and the gear case 12 together.

In at least one embodiment, the motor 11 may be any motor. For example, the motor 11 may be a brush motor, a brushless motor, or the like.

In at least one embodiment, the motor body 112 may include a rotor that rotates about the central axis OO', a stator that is radially opposite the rotor, a housing that houses the stator and the rotor, and the like. However, the present application is not limited thereto, and the motor main body 112 may include other components.

In at least one embodiment, the first support portion 113 may be a flange member 115 provided at the opening portion 114 of the motor 11.

For example, the flange member 115 may be made of metal, which is capable of withstanding a large external force and is not easily damaged, as compared to a resin-made member (e.g., the gear case 12), and the flange member 115 has a small coefficient of thermal contraction, so that the second bearing 14 can be reliably restrained by the flange member 115. However, the present invention is not limited to this, and the first support portion 113 may be another member of the motor 11 as long as it can support the second bearing 14 in the radial direction.

In at least one embodiment, as shown in fig. 2, the rotary shaft 111 of the motor 11 protrudes from the opening portion 114 toward the outside of the motor 11, and extends along the central axis OO' in the gear case 12. The rotating shaft 111 is provided with an engaging portion 116, and the engaging portion 116 engages with the gear 121, so as to drive the gear 121 to rotate. However, the present application is not limited to this, and the gear 121 may be rotated by the rotating shaft 111 in another manner.

In at least one embodiment, the gearbox 12 may be any type of housing. For example, it may be a case made of resin capable of housing the gear 121.

In at least one embodiment, as shown in fig. 2, two bearings may be provided in the drive device 10: a first bearing 13 and a second bearing 14. The first bearing 13 is located in the gear case 12, and the first bearing 13 and the second bearing 14 are located on both sides in the axial direction with respect to the gear 121.

When the driving device 10 is operated, the gear 121 in the gear case 12 and the rotating shaft 111 of the motor 11 are engaged with each other, and the driving device 10 generates large vibration on the gear case 12 side. By providing the first bearing 13 in the gear case 12, vibration of the drive device 10 can be suppressed more reliably. In this state, since the second bearing 14 is radially restricted by the first support portion 113 of the motor 11 and the gear case 12 together, the coaxiality between the motor 11 and the gear case 12 can be ensured and the driving device 10 can be reliably operated without disposing other bearings or other members.

In at least one embodiment, more than two bearings may also be provided in the drive device 10. For example, a third bearing (not shown) may be provided at the other axial end of the rotary shaft 111. However, the present invention is not limited to this, and another bearing for supporting the rotary shaft 111 may be provided at another position of the rotary shaft 111.

In at least one embodiment, the bearing in the driving device 10 may be any bearing as long as it can support the rotation shaft 111 to rotate. For example, the first bearing 13 and the second bearing 14 may be rolling bearings or sliding bearings.

Fig. 3 is a sectional view of a part of the structure of the driving device 10 according to the embodiment of the present invention. As shown in fig. 3, the driving device 10 has a second support portion 15. The second support portion 15 is located on one axial side (upper side as shown in fig. 3) of the first bearing 13, the second support portion 15 has a cylindrical first wall portion 151 and a first hollow portion 152 located on the radially inner side of the first wall portion 151, the first wall portion 151 abuts against the radially outer edge of the first bearing 13 in the axial direction, and the end portion of the rotating shaft 111 on one axial side is located in the first hollow portion 152. Thus, the first bearing 13 can be axially restrained by the second support portion 15, and a rotation space can be provided for the rotation shaft 111 through the first hollow portion 152.

In at least one embodiment, the first bearing 13 may be a rolling bearing. Thereby, the outer ring of the rolling bearing can be pressed by the second support portion 15, and the play of the motor 11 in the axial direction can be adjusted.

The structure of the second support portion 15 will be described below by taking the first bearing 13 as a rolling bearing as an example. As shown in fig. 3, the first bearing 13 has an inner race 131, an outer race 132, and balls 133. The outer ring 132 is fixed to the second support portion 15, and the balls 133 support the inner ring 131 to rotate with the rotary shaft 111.

As shown in fig. 3, the second support portion 15 can limit the position of the first bearing 13 in the axial direction by abutting a surface on the other axial side (lower side as shown in fig. 3) of the first wall portion 151 of the second support portion 15 against a surface on one axial side (upper surface as shown in fig. 3) of the outer ring 132 of the first bearing 13.

As shown in fig. 3, the projection of the inner race 131 of the first bearing 13 in the axial direction falls within the range of the projection of the first hollow portion 152 of the second support portion 15 in the axial direction, whereby the second support portion 15 can not interfere with the rotation of the first bearing 13.

In at least one embodiment, the second support portion 15 may be a threaded nut. In a state where the nut abuts against the outer ring 132 of the first bearing 13 and does not contact the inner ring 131 of the first bearing 13 and the balls 133, the force with which the nut abuts against the outer ring 132 of the first bearing 13 is adjusted, and then an adhesive such as glue is poured onto a portion where the nut contacts the gear case 12, thereby fixing the nut to the gear case 12. However, the present application is not limited thereto, and the second support portion 15 may be provided in another manner. For example, the second support portion 15 may be formed by integrally molding the gear case 12.

In at least one embodiment, as shown in FIG. 3, the gear case 12 has a second wall portion 122 and a second hollow portion 123 located radially inward of the second wall portion 122. The second wall portion 122 axially abuts against the radially outer edge of the first bearing 13 on the other axial side of the first bearing 13.

As shown in fig. 3, the second wall portion 122 of the gear case 12 can limit the position of the first bearing 13 in the axial direction by abutting a surface (an upper surface as shown in fig. 3) on one side in the axial direction of the second wall portion 122 with a surface (a lower surface as shown in fig. 3) on the other side in the axial direction of the outer ring 132 of the first bearing 13.

As shown in fig. 3, the projection of the inner race 131 of the first bearing 13 in the axial direction falls within the range of the projection of the second hollow portion 123 of the gear case 12 in the axial direction, whereby the gear case 12 can not interfere with the rotation of the first bearing 13.

In at least one embodiment, as shown in FIG. 2, the first bearing 13 has a clearance 124 in a radial direction from the gear case 12. Accordingly, the first bearing 13 has a certain adjustment space in the radial direction, and is advantageous in damping vibration generated when the rotary shaft 111 engages with the gear 121.

Fig. 4 is another sectional view of a partial structure of the driving device 10 according to the embodiment of the present invention. As shown in fig. 4, the first support portion 113 has a first extension portion 1131 extending in the axial direction, the first extension portion 1131 is in interference fit with a first partial outer peripheral surface of the second bearing 14, and the gear case 12 has a third support portion 125, and the third support portion 125 is in interference fit with a second partial outer peripheral surface of the second bearing 14. The coaxiality between the gear case 12 and the motor 11 can be further improved by radially positioning the second bearing 14 by interference fit of the two members, i.e., the first support portion 113 and the gear case 12.

In at least one embodiment, the radially inner surface of the first extension 1131 is axially coplanar with the radially inner surface of the third support 125. In other words, the center line of the first extension 1131 is located on the same line as the center line of the third support 125. Thereby, the coaxiality of the gear case 12 and the motor 11 is further improved.

In at least one embodiment, the first support portion 113 may have a second extension portion 1132 extending in a radial direction, the second extension portion 1132 abutting in an axial direction with a radially outer edge of the second bearing 14.

As shown in fig. 4, the second extension portion 1132 is located on the other axial side (lower side as viewed in fig. 4) of the second bearing 14. An axially one-side surface (an upper surface as viewed in fig. 4) of the second extension 1132 abuts against an axially other-side surface (a lower surface as viewed in fig. 4) of the second bearing 14. This allows the second bearing 14 to be axially restrained by the second extension 1132.

The structure of the first support portion 113 will be described below by taking the second bearing 14 as a rolling bearing as an example. As shown in fig. 4, the second bearing 14 has an inner ring 141, an outer ring 142, and balls 143, wherein the outer ring 142 is fixed with respect to the first support portion 113, and the balls 143 support the inner ring 141 to rotate with the rotary shaft 111.

As shown in fig. 4, the width of the second extension 1132 in the radial direction is smaller than the width of the outer ring 142 of the second bearing 14 in the radial direction. This allows the first support portion 113 to prevent interference with the rotation of the second bearing 14. However, the present application is not limited thereto, and the second extension 1132 may not be provided in the first support portion 113.

In at least one embodiment, the first support portion 113 may be the flange 115 of the motor 11, as previously described. The first extension 1131 may be a vertical plate portion of the flange 115, and the second extension 1132 may be a flat plate portion of the flange 115.

In at least one embodiment, as shown in fig. 4, the area of a first portion of the outer circumferential surface of the second bearing 14, which is in contact with the first support portion 113, is larger than the area of a second portion of the outer circumferential surface of the second bearing 14, which is in contact with the third support portion 125. As described above, the first support portion 113 may be made of metal, and the first support portion 113 is brought into contact with most of the outer peripheral surface of the second bearing 14, whereby the second bearing 14 can be more reliably restrained.

In at least one embodiment, one axial side of the second bearing 14 has a clearance 126 with the gear case 12 in the axial direction. Therefore, the second bearing 14 has a certain adjustment space in the axial direction, which is beneficial to buffering the vibration generated when the rotating shaft 111 is meshed with the gear 121.

Fig. 5 is another sectional view of a partial structure of the driving device 10 according to the embodiment of the present invention. In at least one embodiment, as shown in fig. 5, the driving device 10 has a shaft support portion 16, the shaft support portion 16 being located on the other axial side (lower side as shown in fig. 5) of the rotating shaft 111, and the shaft support portion 16 has a hole portion 161 that receives an end portion on the other axial side of the rotating shaft 111. As shown in fig. 5 and 2, the center line of the hole 161, the center line of the first bearing 13, and the center line of the second bearing 14 all coincide with the center axis OO' of the rotary shaft 111. This can restrict the radial displacement of the rotary shaft 111, and can smoothly rotate the rotary shaft 111, thereby increasing the torque of the rotary shaft 111. However, the present application is not limited thereto, and the drive device 10 may not be provided with the shaft support portion 16.

As is clear from the above embodiment, the first support portion 113 of the motor 11 and the gear case 12 together limit the position of the second bearing 14 in the radial direction of the second bearing 14, and thus the coaxiality of the gear case 12 and the motor 11 can be improved.

Example 2

This embodiment provides an electrical product, which includes the driving device described in embodiment 1, and since the structure of the driving device has been described in embodiment 1, the content thereof is incorporated herein, and thus the description thereof is omitted.

With the electric product according to the present embodiment, since the structure of the driving device described in embodiment 1 is adopted, the first support portion of the motor of the driving device and the gear box of the driving device limit the position of the second bearing in the radial direction of the second bearing, and the coaxiality of the gear box and the motor can be improved.

In the embodiment, the electric product may be any electric product using a driving device, for example, an on-board product using a driving device, such as an electronic vacuum pump of an automobile, a brake of an automobile, a transmission of an automobile, and the like; alternatively, the present invention may be applied to various information devices, industrial devices, and the like using a driving device, or may be applied to home appliances such as an indoor unit of an air conditioner, an outdoor unit of an air conditioner, a water dispenser, a washing machine, a cleaner, a compressor, a blower, and a stirrer.

The present invention has been described in connection with specific embodiments, but it should be clear to a person skilled in the art that these descriptions are intended to be illustrative and not limiting to the scope of the invention. Various modifications and adaptations of the present invention may occur to those skilled in the art, which are within the spirit and scope of the present invention.

Claims

1. A drive arrangement, characterized in that the drive arrangement comprises a motor, a gearbox and at least two bearings comprising a first bearing and a second bearing,

the motor has:

a rotating shaft extending along a central axis;

a motor main body disposed around the rotation shaft; and

a first support portion located on one side of the motor main body in an axial direction,

a gear is arranged in the gear box, the gear box is connected with the motor at one axial side of the motor,

the first bearing and the second bearing support the rotating shaft, the first bearing is located on one side of the rotating shaft in the axial direction, and the first supporting portion and the gear box limit the second bearing in the radial direction of the second bearing.

2. The drive of claim 1, wherein the first bearing is located within the gear box, the first bearing and the second bearing being axially located on opposite sides of the gear.

3. The drive device of claim 1, further comprising:

a second support portion located on one axial side of the first bearing, the second support portion having a cylindrical first wall portion and a first hollow portion located radially inside the first wall portion,

the first wall portion is in axial abutment with a radially outer edge of the first bearing, and an end portion of the rotating shaft on one axial side is located in the first hollow portion.

4. The drive of claim 1, wherein the first bearing is a rolling bearing.

5. The drive device according to claim 1,

the gear case has a second wall portion and a second hollow portion located radially inside of the second wall portion,

the second wall portion is axially abutted against a radially outer edge of the first bearing on the other axial side of the first bearing.

6. The drive of claim 1, wherein the first bearing has a clearance from the gear box in a radial direction.

7. The drive device according to claim 1,

the first support part is provided with a first extension part extending in the axial direction, the first extension part is in interference fit with the first part of the outer peripheral surface of the second bearing,

the gear box is provided with a third supporting part which is in interference fit with the second part of the outer peripheral surface of the second bearing.

8. The drive device according to claim 1, wherein an axial side of the second bearing has a clearance in an axial direction from the gear case.

9. The drive device of claim 1, further comprising:

a shaft support portion located on the other axial side of the rotary shaft, the shaft support portion having a hole portion that receives an end portion on the other axial side of the rotary shaft,

a center line of the hole portion, a center line of the first bearing, and a center line of the second bearing all coincide with the center axis of the rotary shaft.

10. An electrical product, characterized in that it comprises a drive device according to any one of claims 1 to 9.