CN211901489U - Motor unit - Google Patents
Motor unit Download PDFInfo
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- CN211901489U CN211901489U CN202020325138.XU CN202020325138U CN211901489U CN 211901489 U CN211901489 U CN 211901489U CN 202020325138 U CN202020325138 U CN 202020325138U CN 211901489 U CN211901489 U CN 211901489U
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- shaft
- planetary gear
- gear mechanism
- flow path
- lubricating oil
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Abstract
The utility model provides a motor unit can promote the lubricated effect to planetary gear mechanism etc.. The motor unit includes: a first shaft that is a hollow cylindrical shaft and to which a driving force from a motor is input; a first planetary gear mechanism connected to the first shaft and to which a driving force is input; a second planetary gear mechanism connected to the first planetary gear mechanism to transmit a driving force; a differential connected to the second planetary gear mechanism for transmitting a driving force; and a second shaft connected to the differential and transmitting the driving force to the wheels, the second shaft being provided on an inner peripheral portion of the first shaft, a spiral groove being provided between the inner peripheral surface of the first shaft and an outer peripheral surface of the second shaft to form a first flow path and a second flow path through which the lubricating oil flows, the outer peripheral surface of the first shaft being formed with a first opening portion and a second opening portion, the first flow path communicating with the first opening portion to supply the lubricating oil to the motor, and the second flow path communicating with the second opening portion to supply the lubricating oil to the first planetary gear mechanism.
Description
Technical Field
The utility model relates to a motor unit.
Background
As is known, a motor unit is generally provided in a vehicle. The motor unit generally includes a housing, and a motor (motor), a planetary gear mechanism, a differential (differential), and the like housed in the housing. The planetary gear mechanism generally includes a sun gear (sun gear), a pinion gear (pinion gear) meshing with the sun gear, a carrier (carrier) fixing the pinion gear, and a ring gear (ring gear) fixed to the housing. Also, the motor unit may be provided with a lubricating structure for guiding the lubricating oil to lubricate the above members. In the related art, a shaft member used for a motor unit, such as an input shaft, may be formed in a hollow cylindrical shape, whereby lubricating oil is transmitted as a lubricating oil supply flow path through a hollow passage in the shaft member. In this way, the driving force of the motor is transmitted to the wheels via the output shaft after being transmitted via the input shaft, the planetary gear mechanism, the differential, and other members. As the shaft member rotates, the lubricating oil is sequentially transferred from the oil groove (oil tank) to the motor, the planetary gear mechanism, the differential, and other members for lubrication, and the differential is lifted up and then returned to the oil groove again. However, when the number of rotations of the shaft member increases, that is, in a state of high rotation speed, the lubricating oil is discharged in a large amount on the upstream side of the lubricating oil supply flow path, so that the supply of the lubricating oil to the motor on the upstream side becomes excessive, whereas the supply of the lubricating oil to the planetary gear mechanism and the like on the downstream side becomes insufficient. As described above, there is a problem that the motor unit has a poor lubricating effect on the planetary gear mechanism and the like.
[ Prior art documents ]
[ patent document ]
[ patent document 1] Japanese patent laid-open publication No. 2017-219051
[ patent document 2] Japanese patent publication No. 5929527
SUMMERY OF THE UTILITY MODEL
The utility model provides a motor unit can promote the lubricated effect to planetary gear mechanism etc..
The utility model provides a motor unit, include: a first shaft that is a hollow cylindrical shaft and to which a driving force from a motor is input; a first planetary gear mechanism connected to the first shaft and to which the driving force is input; a second planetary gear mechanism connected to the first planetary gear mechanism to transmit the driving force; a differential connected to the second planetary gear mechanism to transmit the driving force; and a second shaft connected to the differential and transmitting the driving force to wheels, the second shaft being provided on an inner peripheral portion of the first shaft, a spiral groove being provided between the inner peripheral surface of the first shaft and an outer peripheral surface of the second shaft to form a first flow path and a second flow path through which a lubricating oil flows, the outer peripheral surface of the first shaft being formed with a first opening portion and a second opening portion, the first flow path communicating with the first opening portion to supply the lubricating oil to the motor, the second flow path communicating with the second opening portion to supply the lubricating oil to the first planetary gear mechanism.
In an embodiment of the present invention, the spiral groove is provided on an inner peripheral surface of the first shaft, and includes a first spiral groove and a second spiral groove that are not communicated with each other, the first spiral groove forms the first flow path and communicates with the first opening portion, and the second spiral groove forms the second flow path and communicates with the second opening portion.
In an embodiment of the present invention, the first opening portion is provided on the outer peripheral surface of the first shaft adjacent to the end portion of the motor, and the second opening portion is provided on the outer peripheral surface of the first shaft adjacent to the end portion of the first planetary gear mechanism.
In an embodiment of the present invention, the first opening portion is provided on an upstream side in a flow direction of the lubricating oil, and the second opening portion is provided on a downstream side in the flow direction of the lubricating oil.
In view of the above, in the motor unit of the present invention, the first shaft, the first planetary gear mechanism, the second planetary gear mechanism, the differential, and the second shaft are connected to each other to transmit the driving force from the motor to the wheel. The second shaft is provided on an inner peripheral portion of the first shaft to form a double pipe structure, a spiral groove is provided between the inner peripheral surface of the first shaft and an outer peripheral surface of the second shaft to form a first flow path and a second flow path through which lubricating oil flows, and the outer peripheral surface of the first shaft is formed with a first opening portion and a second opening portion, the first flow path communicating with the first opening portion to supply lubricating oil to the motor, and the second flow path communicating with the second opening portion to supply lubricating oil to the first planetary gear mechanism. As a result, the lubricating oil can be supplied to the motor and the first planetary gear mechanism through the first flow path and the second flow path, respectively, and the supply amount of the lubricating oil to be supplied to the first planetary gear mechanism and the like can be secured even at a high rotation speed. Accordingly, the utility model discloses a motor unit can promote the lubricated effect to planetary gear mechanism etc..
In order to make the aforementioned and other features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
Drawings
Fig. 1 is a schematic view of a motor unit according to an embodiment of the present invention;
FIG. 2 is a schematic cross-sectional view of the first and second shafts shown in FIG. 1;
FIG. 3 is a schematic illustration of the helical grooves of the first and second shafts shown in FIG. 2.
Description of reference numerals:
20: a motor;
30: a housing;
100: a motor unit;
110: a first shaft;
112: a first helical groove;
114: a second helical groove;
116: a first opening portion;
118: a second opening portion;
120: a first planetary gear mechanism;
122: a first sun gear;
124: a first pinion gear;
126: a first carrier;
128: a first ring gear;
130: a second planetary gear mechanism;
132: a second sun gear;
134: a second pinion gear;
136: a second carrier;
138: a second ring gear;
140: a differential mechanism;
150: a second shaft;
s1: an inner peripheral surface;
s2, S3: an outer peripheral surface;
p1: a first flow path;
p2: a second flow path.
Detailed Description
Fig. 1 is a schematic view of a motor unit according to an embodiment of the present invention, fig. 2 is a schematic cross-sectional view of a first shaft and a second shaft shown in fig. 1, and fig. 3 is a schematic view of a spiral groove of the first shaft and the second shaft shown in fig. 2. The overall structure of the motor unit 100 of the present embodiment and the manner of lubricating the components of the motor unit 100 with lubricating oil will be described below with reference to fig. 1 to 3.
Referring to fig. 1, in the present embodiment, a motor unit 100 includes a first shaft 110, a first planetary gear mechanism 120, a second planetary gear mechanism 130, a differential 140, and a second shaft 150. The first shaft 110 is a hollow cylindrical shaft, and a driving force from the motor 20 is input as an input shaft. The first planetary gear mechanism 120 is connected to the first shaft 110, and a driving force is input thereto. The second planetary gear mechanism 130 is connected to the first planetary gear mechanism 120 to transmit a driving force. The differential 140 is connected to the second planetary gear mechanism 130 to transmit the driving force. The second shaft 150 is connected to the differential 140, and serves as an output shaft that transmits the driving force to wheels, not shown. As can be seen, the above members are provided in the housing 30 and transmit the driving force from the motor 20 to the wheels.
Specifically, in the present embodiment, the first planetary gear mechanism 120 has a first sun gear 122, a first pinion gear 124 that meshes with the first sun gear 122, a first carrier 126 that fixes the first pinion gear 124, and a first ring gear 128 that is fixed to the housing 30. Similarly, the second planetary gear mechanism 130 has a second sun gear 132, a second pinion gear 134 that meshes with the second sun gear 132, a second carrier 136 that fixes the second pinion gear 134, and a second ring gear 138 that is fixed to the housing 30. In this manner, the driving force from the motor 20 is input to the first planetary gear mechanism 120 through the first shaft 110 as an input shaft, transmitted to the second planetary gear mechanism 130 via the first sun gear 122, the first pinion gear 124, and the first carrier 126, further transmitted to the differential gear of the differential gear 140 via the second sun gear 132, the second pinion gear 134, and the second carrier 136, and transmitted to the wheels, not shown, via the second shaft 150 as an output shaft. However, the above-mentioned structure of the first planetary gear mechanism 120 and the second planetary gear mechanism 130 is only an example, and the present invention is not limited thereto, and can be adjusted according to the requirement.
In the present embodiment, referring to fig. 2 and 3, the first shaft 110 as an input shaft is a hollow cylindrical shaft, and the second shaft 150 as an output shaft is provided on an inner peripheral portion of the first shaft 110. In this way, the first shaft 110 as the input shaft and the second shaft 150 as the output shaft form a double pipe structure, and the hollow passage between the inner peripheral surface S1 of the first shaft 110 as the input shaft and the outer peripheral surface S2 of the second shaft 150 as the output shaft can serve as a lubricant supply flow path to transmit lubricant. As the first shaft 110 rotates, the lubricating oil is sequentially transferred from the oil sump, not shown, to the motor 20, the first planetary gear mechanism 120, the second planetary gear mechanism 130, the differential gear 140, and the like, and is lubricated, and the lubricating oil is raised up and returned to the oil sump again. In the following description, the side closer to the motor 20 is referred to as the upstream side in the flow direction of the lubricating oil, and the side closer to the first planetary gear mechanism 120 and the like is referred to as the downstream side in the flow direction of the lubricating oil.
Specifically, in the present embodiment, a spiral groove is provided between the inner circumferential surface S1 of the first shaft 110 and the outer circumferential surface S2 of the second shaft 150 to form the first flow path P1 and the second flow path P2 through which the lubricating oil flows. The helical groove includes a first helical groove 112 and a second helical groove 114 that are not in communication with each other. The first helical groove 112 forms a first flow path P1, and the second helical groove 114 forms a second flow path P2. Therefore, the first flow path P1 formed by the first spiral groove 112 and the second flow path P2 formed by the second spiral groove 114 do not communicate with each other. The first and second spiral grooves 112 and 114, which are spiral grooves, are provided on the inner circumferential surface S1 of the first shaft 110, for example, but the spiral grooves may be provided between the inner circumferential surface S1 of the first shaft 110 and the outer circumferential surface S2 of the second shaft 150 to form the first and second flow paths P1 and P2 through which the lubricating oil flows.
In the present embodiment, the first opening 116 and the second opening 118 are formed in the outer peripheral surface S3 of the first shaft 110. The first opening 116 is provided at an end portion of the outer peripheral surface S3 of the first shaft 110 adjacent to the motor 20, for example, on the upstream side in the flow direction of the lubricating oil. In contrast, the second opening 118 is provided at an end portion of the outer peripheral surface S3 of the first shaft 110 adjacent to the first planetary gear mechanism 120, for example, on the downstream side in the flow direction of the lubricating oil. Further, the first opening 116 and the second opening 118 penetrate the wall surface of the first shaft 110, and thus the inside and the outside of the first shaft 110 can be communicated. In this manner, the first flow path P1 formed by the first spiral groove 112 communicates with the first opening portion 116 to supply the lubricating oil to the motor 20 (shown in fig. 1), and the second flow path P2 formed by the second spiral groove 114 communicates with the second opening portion 118 to supply the lubricating oil to the first planetary gear mechanism 120 (shown in fig. 1). However, as long as the first opening 116 can communicate with the first spiral groove 112 as the first flow path P1 to supply the lubricating oil to the motor 20, and the second opening 118 can communicate with the second spiral groove 114 as the second flow path P2 to supply the lubricating oil to the first planetary gear mechanism 120, the present invention does not limit the installation positions of the first opening 116 and the second opening 118, and it can be adjusted as required.
Further, after the lubricating oil enters the lubricating oil supply flow path constituted by the hollow passage between the inner peripheral surface S1 of the first shaft 110 and the outer peripheral surface S2 of the second shaft 150 from an oil groove, not shown, the lubricating oil is divided into two parts and enters the first flow path P1 formed by the first helical groove 112 and the second flow path P2 formed by the second helical groove 114, respectively. As the first shaft 110 rotates, the divided lubricating oil flows along the first spiral groove 112 and the second spiral groove 114, which have a spiral shape, from the upstream side (the right side in the drawing of fig. 1 to 3) to the downstream side (the left side in the drawing of fig. 1 to 3). Subsequently, the lubricating oil that has entered the first flow path P1 formed by the first spiral groove 112 flows out to the motor 20 from the first opening portion 116, and the lubricating oil that has entered the second flow path P2 formed by the second spiral groove 114 flows out to the first planetary gear mechanism 120 from the second opening portion 118. In this way, the lubricating oil can be sequentially transferred from the oil sump, not shown, to the motor 20, the first planetary gear mechanism 120, the second planetary gear mechanism 130, the differential 140, and the like for lubrication.
It can be seen that since the first flow path P1 formed by the first spiral groove 112 and the second flow path P2 formed by the second spiral groove 114 do not communicate with each other, after the lubricating oil enters the lubricating oil supply flow path formed by the hollow passage between the inner peripheral surface S1 of the first shaft 110 and the outer peripheral surface S2 of the second shaft 150 from the oil groove, not shown, the lubricating oil is divided into two parts and supplied to the motor 20 on the upstream side and the first planetary gear mechanism 120 on the downstream side, respectively. In this way, even at a high rotation speed, the lubricating oil supplied by being divided into two parts after entering the lubricating oil supply flow path can be supplied to the motor 20 located on the upstream side and the first planetary gear mechanism 120 located on the downstream side while ensuring the supply amount. Therefore, the motor unit 100 can enhance the lubricating effect on the first planetary gear mechanism 120 and the like on the downstream side.
As described above, in the motor unit of the present invention, the first shaft, the first planetary gear mechanism, the second planetary gear mechanism, the differential, and the second shaft are connected to each other to transmit the driving force from the motor to the wheel. The second shaft is provided on an inner peripheral portion of the first shaft to form a double pipe structure, a spiral groove is provided between the inner peripheral surface of the first shaft and an outer peripheral surface of the second shaft to form a first flow path and a second flow path through which lubricating oil flows, and the outer peripheral surface of the first shaft is formed with a first opening portion and a second opening portion, the first flow path communicating with the first opening portion to supply lubricating oil to the motor, and the second flow path communicating with the second opening portion to supply lubricating oil to the first planetary gear mechanism. As a result, the lubricating oil can be supplied to the motor and the first planetary gear mechanism through the first flow path and the second flow path, respectively, and the supply amount of the lubricating oil to be supplied to the first planetary gear mechanism and the like can be secured even at a high rotation speed. Accordingly, the utility model discloses a motor unit can promote the lubricated effect to planetary gear mechanism etc..
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications or substitutions do not depart from the scope of the embodiments of the present invention, and the essence of the corresponding technical solutions is not disclosed.
Claims (4)
1. A motor unit, comprising:
a first shaft that is a hollow cylindrical shaft and to which a driving force from a motor is input;
a first planetary gear mechanism connected to the first shaft and to which the driving force is input;
a second planetary gear mechanism connected to the first planetary gear mechanism to transmit the driving force;
a differential connected to the second planetary gear mechanism to transmit the driving force; and
a second shaft connected to the differential and transmitting the driving force to wheels,
the second shaft is provided on an inner peripheral portion of the first shaft,
a spiral groove is provided between an inner peripheral surface of the first shaft and an outer peripheral surface of the second shaft to form a first flow path and a second flow path through which a lubricating oil flows, and a first opening and a second opening are formed in the outer peripheral surface of the first shaft,
the first flow path communicates with the first opening portion to supply the lubricating oil to the motor,
the second flow path communicates with the second opening portion to supply the lubricating oil to the first planetary gear mechanism.
2. The motor unit according to claim 1, wherein the spiral groove is provided at an inner peripheral surface of the first shaft, and includes a first spiral groove and a second spiral groove that are not communicated with each other,
the first spiral groove forms the first flow path and communicates with the first opening,
the second spiral groove forms the second flow path and communicates with the second opening.
3. The motor unit according to claim 1 or 2, characterized in that the first opening portion is provided on the outer peripheral surface of the first shaft adjacent to an end portion of the motor, and the second opening portion is provided on the outer peripheral surface of the first shaft adjacent to an end portion of the first planetary gear mechanism.
4. The motor unit according to claim 1 or 2, characterized in that the first opening portion is provided on an upstream side in a flow direction of the lubricating oil, and the second opening portion is provided on a downstream side in the flow direction of the lubricating oil.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020325138.XU CN211901489U (en) | 2020-03-16 | 2020-03-16 | Motor unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020325138.XU CN211901489U (en) | 2020-03-16 | 2020-03-16 | Motor unit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211901489U true CN211901489U (en) | 2020-11-10 |
Family
ID=73322323
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020325138.XU Active CN211901489U (en) | 2020-03-16 | 2020-03-16 | Motor unit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211901489U (en) |
-
2020
- 2020-03-16 CN CN202020325138.XU patent/CN211901489U/en active Active
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| GR01 | Patent grant |