CN210661220U - Planetary gear transmission case - Google Patents
Planetary gear transmission case Download PDFInfo
- Publication number
- CN210661220U CN210661220U CN201921561156.1U CN201921561156U CN210661220U CN 210661220 U CN210661220 U CN 210661220U CN 201921561156 U CN201921561156 U CN 201921561156U CN 210661220 U CN210661220 U CN 210661220U
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- China
- Prior art keywords
- planet carrier
- planetary gear
- gear
- gear transmission
- sun gear
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Abstract
The utility model relates to a planetary gear transmission case, including casing part, first planetary gear transmission level and second planetary gear transmission level, first planetary gear transmission level includes first sun gear, first planet carrier and first ring gear, second planetary gear transmission level includes second sun gear, second planet carrier and second ring gear, first sun gear is connected with external input element, first planet carrier with the second sun gear is connected, the second planet carrier is connected with output element, the second planet carrier directly supports on the box, the drive ratio of this transmission case is greater than 25, the second planet carrier directly supports on the box. The utility model discloses the stifled moment of torsion of turning of gear box has been increased for the output rotational speed reduces, therefore can cancel the bearing spare at the output.
Description
Technical Field
The utility model belongs to the technical field of the transmission, concretely relates to planetary gear transmission case.
Background
With the continuous development of automobiles towards the direction of intellectualization and comfort, the electric tail gate becomes a trend, and more automobiles begin to apply the electric tail gate. The electric tail gate is generally driven by a motor to drive a gear box, and then the tail gate is driven to open and close.
Fig. 1 shows a conventional gear box structure for a power tailgate. The gear box is provided with a first-stage planetary gear transmission gear train PG1 and a second-stage planetary gear transmission gear train PG2, each stage of planetary gear transmission gear train is composed of a sun gear, a gear ring and a planet carrier, power is input by the sun gear of the first-stage planetary gear transmission gear train PG1, is output to the second-stage planetary gear transmission gear train PG2 through the planet carrier and is output by the planet carrier of the second-stage planetary gear transmission gear train PG 2. The planet carrier of the second stage planetary gear train PG2 is supported on bearing B.
Such gearboxes are designed with a relatively low transmission, typically below 25, thus resulting in a low torque transmitted, typically less than 5Nm output; because the transmitted torque is small and the strength requirement on the sun gear is low, the sun gear of at least one stage of planetary gear train can be made of plastics. Meanwhile, due to the low transmission ratio, when the gear box is adopted, a symmetrical arrangement mode is generally adopted.
Therefore, the gearbox has the defects of low transmission torque and high cost. Meanwhile, two of the devices are required to be arranged, so that the occupied space is larger.
SUMMERY OF THE UTILITY MODEL
In order to solve the technical problem to a certain extent, the utility model provides a following technical scheme.
A planetary gear transmission case comprising a housing portion, a first planetary gear transmission stage comprising a first sun gear, a first planet carrier and a first ring gear, and a second planetary gear transmission stage comprising a second sun gear, a second planet carrier and a second ring gear, the first sun gear being connected to an external input element, the first planet carrier being connected to the second sun gear, the second planet carrier being connected to an output element, the gear ratio of the gear transmission case being greater than 25.
A planetary gear transmission case comprising a housing portion, a first planetary gear transmission stage comprising a first sun gear, a first planet carrier and a first ring gear, and a second planetary gear transmission stage comprising a second sun gear, a second planet carrier and a second ring gear, the first sun gear being connected with an external input element, the first planet carrier being connected with the second sun gear, the second planet carrier being connected with an output element, the second planet carrier being directly supported on the case.
According to above two technical scheme, because the utility model discloses redesign the drive ratio of gear box, make its drive ratio be greater than and equal to 25, preferably between 25-30 to increase the stifled moment of torsion of gear box. In addition, the reduction of the output speed due to the increase of the transmission ratio makes it possible to dispense with bearing elements at the output
Further, the material of the second sun gear is metal.
Further, the housing portion includes an intermediate housing provided with a support portion extending radially inward, the first carrier being supported by the support portion.
Further, the housing portion further includes a first end cap and a second end cap.
Further, a bearing is arranged in the central through hole of the first end cover.
Further, a spacer is disposed between the first end cover and the planetary gear on the first carrier.
Drawings
Other specific features and advantages will become apparent from the following description, taken in conjunction with the accompanying drawings, which are given by way of rough and non-limiting reference, and in which:
FIG. 1 is a schematic view of a prior art gearbox configuration.
Fig. 2 is a schematic structural diagram of the gear box of the present invention.
Fig. 3 is an exploded view of the components of the gear box of the present invention.
All the figures are purely diagrammatic and not drawn to scale, and moreover they show only those parts which are necessary for the elucidation of the invention, other parts being omitted or merely mentioned. That is, the present invention may include other components in addition to those shown in the drawings.
Detailed Description
The technical solution of the present invention will be described in detail below with reference to the accompanying drawings.
Referring to fig. 2 and 3, the housing part of the gearbox of the present invention comprises a first end cap 1 on the left and a second end cap 8 on the right and a gearbox intermediate housing 4. The first end cover 1 and the second end cover 8 close the gearbox middle shell 4 from two sides, and the transmission component is arranged in the closed space.
The transmission component is a two-stage transmission device. Specifically, the first stage transmission stage is composed of the first sun gear 3, the first carrier 5, and the first ring gear formed inside the gearbox intermediate housing 4. The power input by the motor is transmitted to the first sun gear 3, further to the first carrier 5 via the planet gears, and then to the second transmission stage.
The second transmission stage comprises a second sun gear, a second ring gear 6 and a second planet carrier 7. The second annulus gear 6 is fixedly arranged on the gearbox intermediate housing 4. As can be seen from fig. 2, the first planet carrier 5 is provided in one piece with the second sun gear. Of course, this is only an exemplary embodiment, and the first planet carrier 5 and the second sun gear may not be provided as one piece, but may each be made of separate parts. The power is finally output by the second carrier 7.
As can be seen from fig. 2, a bearing 2 is provided in the central through hole of the first end cap 1 for supporting the input shaft. No bearing is provided in the central through-hole of the second end cap 8, in which the second planet carrier 7 is directly supported. Because compare in current transmission case, the transmission ratio of the utility model discloses a transmission case is higher (can reach 30 the highest) to make the output rotational speed of second planet carrier 7 lower. Because the rotating speed is lower, the abrasion between the second end cover 2 and the rotating speed is relatively reduced, so that a bearing can be omitted, and the cost is reduced.
Furthermore, as a preferred embodiment, a lubricating oil is provided between the second carrier 7 and the second end cover 8 to further reduce wear therebetween.
As can also be seen from fig. 2 and 3, a spacer 9 is provided between the first end cover 1 and the planet gears on the first planet carrier 5 to reduce friction.
As another preferred embodiment of the present invention, as can be seen from fig. 2, a supporting portion extending radially inward is provided on the gearbox center case 4 of the present invention so as to support the first carrier 5. Through this bearing structure, the operation of first planet carrier 5 can be more steady to the noise at work of gear box has been reduced.
Therefore, the transmission ratio of the gear box is redesigned to be more than or equal to 25, preferably between 25 and 30, so that the locked-rotor torque of the gear box is increased and can be more than 5.5 Nm; accordingly, the second sun gear is made of a metal material in order to increase the strength of the structural member due to the increase of the torque. Of course, the first sun gear, the first planet carrier and the second planet carrier can also be made of metal materials. Furthermore, the bearing elements can be omitted at the output because the output speed decreases as the transmission ratio increases.
Having clearly and fully described the present invention with reference to the above illustrative embodiments, it should be understood by those skilled in the art that various other embodiments may be devised which do not depart from the spirit and scope of the invention by modifying the disclosed technology. These embodiments should be understood to fall within the scope of the present invention as determined based on the claims and any equivalents thereof.
Claims (7)
1. A planetary gear transmission box comprising a housing part, a first planetary gear transmission stage comprising a first sun gear (3), a first planet carrier (5) and a first ring gear, and a second planetary gear transmission stage comprising a second sun gear, a second planet carrier (7) and a second ring gear (6), the first sun gear (3) being connected with an external input element, the first planet carrier (5) being connected with the second sun gear, the second planet carrier (7) being connected with an output element, characterized in that the gear ratio of the gear transmission box is larger than 25.
2. A planetary gear transmission box comprising a housing part, a first planetary gear transmission stage comprising a first sun gear (3), a first planet carrier (5) and a first ring gear, and a second planetary gear transmission stage comprising a second sun gear, a second planet carrier (7) and a second ring gear (6), the first sun gear (3) being connected with an external input element, the first planet carrier (5) being connected with the second sun gear, the second planet carrier (7) being connected with an output element, characterized in that the second planet carrier (7) is directly supported on the housing part.
3. A planetary gear transmission according to claim 1 or 2, characterized in that the material of the second sun gear is metal.
4. A planetary gear transmission according to claim 1 or 2, characterized in that the housing parts comprise an intermediate housing (4), which intermediate housing (4) is provided with a support extending radially inwards, by which support the first planet carrier (5) is supported.
5. A planetary gear transmission according to claim 4, characterized in that the housing part further comprises a first end cover (1) and a second end cover (8).
6. A planetary gear transmission according to claim 5, characterized in that a bearing (2) is arranged in the central through hole of the first end cover (1).
7. A planetary gear transmission according to claim 5, characterized in that a spacer (9) is arranged between the first end cover (1) and the planetary gears on the first planet carrier (5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921561156.1U CN210661220U (en) | 2019-09-19 | 2019-09-19 | Planetary gear transmission case |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921561156.1U CN210661220U (en) | 2019-09-19 | 2019-09-19 | Planetary gear transmission case |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210661220U true CN210661220U (en) | 2020-06-02 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921561156.1U Active CN210661220U (en) | 2019-09-19 | 2019-09-19 | Planetary gear transmission case |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210661220U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110486424A (en) * | 2019-09-19 | 2019-11-22 | 广东肇庆爱龙威机电有限公司 | Planetary Gear Transmission case |
-
2019
- 2019-09-19 CN CN201921561156.1U patent/CN210661220U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110486424A (en) * | 2019-09-19 | 2019-11-22 | 广东肇庆爱龙威机电有限公司 | Planetary Gear Transmission case |
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