Planetary reduction and drive system
Patent Information
- Application Number
- CN202521635590.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-08-01
- Publication Date
- 2026-09-15
- Estimated Expiration
- 2035-08-01
AI Technical Summary
但即便采取了相关措施，仍难以进行快速检测
[0018] The wavy end face and circumferential surface create a line contact between the mating surfaces, reducing wear. The second mating part can replace the traditional spacer to prevent the bearing from moving axially.
Smart Images
Figure CN224756268U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of planetary gear reducers, and more particularly to planetary gear reducers and drive systems. Background Technology
[0002] See Figure 1 In the first planetary reducer known to the inventor, no spacer was provided between the two needle roller bearings 601. See also Figure 2 In the second planetary reducer known to the inventor, the tooth width of the planetary gear 602 is relatively larger in order to improve NVH (noise, vibration and harshness) performance. However, in order to reduce costs, the needle roller bearing 601 of the first planetary reducer is used. As a result, there is a bearing gap between the two needle roller bearings 601. A spacer 603 needs to be set between the two needle roller bearings 601 to limit the axial position of the needle roller bearings 601.
[0003] The shortcomings of the above solution include:
[0004] (1) The spacer 603 is installed inside the needle roller bearing 601 and will be completely obscured during assembly. The installation process can be recorded with the help of a camera to determine if any parts are missing. However, even with these measures, it is still difficult to perform rapid detection.
[0005] (2) If the tooth width of the planetary gear 602 is to be changed, the spacer 603 or the needle roller bearing 601 needs to be redeveloped, which will not only generate high development costs, but also make it difficult to apply to platform design.
[0006] (3) The flat washers 604 at both ends of the planetary gear 602 are prone to rotate with the planetary gear 602, which causes wear on the flat washers 604 and the planetary carrier 605. Utility Model Content
[0007] To address or improve at least one of the problems mentioned in the background art, this application provides a planetary reducer and a drive system.
[0008] The planetary reducer provided in this application includes: a planet carrier; a plurality of planet gears mounted on the planet carrier via pins; and a bearing located between the inner bore of the planet gears and the pins. The reducer is characterized by further including a corrugated washer, the corrugated washer comprising: a first abutment portion, which is formed as a corrugated end face having crests and troughs, with a crest on one axial side forming a trough on the other axial side; in the axial direction, one side of the first abutment portion abuts against the planet gear, and the other side abuts against the planet carrier; and a second abutment portion, which is integrally formed with the first abutment portion and is formed as a corrugated circumferential surface having crests and troughs; the second abutment portion is disposed in the inner bore of the planet gear; in the axial direction, the axial end of the second abutment portion abuts against the bearing.
[0009] In at least one embodiment, the corrugated gasket further includes a third abutment portion, which is integrally formed with the second abutment portion and is formed as a corrugated end face with crests and troughs, wherein the third abutment portion abuts against the bearing in the axial direction.
[0010] In at least one embodiment, the first contact portion is located radially outside the second contact portion.
[0011] In at least one embodiment, the third contact portion is located inside the radial direction of the second contact portion.
[0012] In at least one embodiment, the crests and troughs are alternately arranged, and the crests at different positions have the same convex height, and the troughs at different positions have the same concave depth, so that the tops of the multiple crests and the bottoms of the multiple troughs respectively form contact surfaces.
[0013] In at least one embodiment, the corrugated gasket is made of a material that can be formed by stamping, and the contact surfaces formed by the tops of the multiple crests and the contact surfaces formed by the bottoms of the multiple troughs can move toward each other under opposing pressure.
[0014] In at least one embodiment, the contact surface on the outer circumference formed by the plurality of crests of the second contact portion is in clearance fit with the inner hole of the planetary gear.
[0015] In at least one embodiment, the corrugated gasket is compressed in the axial direction, thereby axially positioning the bearing and the planetary gear.
[0016] In at least one embodiment, two of the corrugated gaskets are arranged in pairs on both sides of the bearing in the axial direction.
[0017] The drive system provided in this application includes the aforementioned planetary reducer.
[0018] The wavy end face and circumferential surface create a line contact between the mating surfaces, reducing wear. The second mating part can replace the traditional spacer to prevent the bearing from moving axially. Attached Figure Description
[0019] Figure 1 A cross-sectional view of the first planetary reducer known to the inventors is shown.
[0020] Figure 2 A cross-sectional view of the second planetary reducer as understood by the inventor is shown.
[0021] Figure 3 A cross-sectional view of a first embodiment of the planetary reducer according to this application is shown.
[0022] Figure 4 It shows Figure 3 A magnified view of a portion of the image.
[0023] Figure 5 A cross-sectional view of a first embodiment of the corrugated gasket according to this application is shown.
[0024] Figure 6 An isometric view of a first embodiment of the corrugated gasket according to this application is shown.
[0025] Figure 7 A cross-sectional view of a second embodiment of the planetary reducer according to this application is shown.
[0026] Figure 8 It shows Figure 7 A magnified view of a portion of the image.
[0027] Figure 9 A cross-sectional view of a second embodiment of the corrugated gasket according to this application is shown.
[0028] Figure 10 It shows Figure 9 Side view of the wavy gasket in the middle.
[0029] Figure 11 An isometric view of a second embodiment of the corrugated gasket according to this application is shown.
[0030] Explanation of reference numerals in the attached figures
[0031] 100 corrugated gasket
[0032] 101 peaks
[0033] 102 trough
[0034] 103 Confrontation Surface
[0035] 110 First Confrontation Section
[0036] 120 Second Contact Section
[0037] 130 Third Confrontation Section
[0038] 200 planetary wheels
[0039] 210 inner hole
[0040] 300 planetary carriers
[0041] 400 bearing
[0042] 500 pin
[0043] 601 needle roller bearing
[0044] 602 Planetary Gear
[0045] 603 spacer
[0046] 604 flat washer
[0047] 605 Planetary Carrier
[0048] Axial axis
[0049] R radial Detailed Implementation
[0050] Exemplary embodiments of this application are described below with reference to the accompanying drawings. It should be understood that these specific descriptions are for teaching those skilled in the art how to implement this application only, and are not intended to exhaustively describe all possible methods of this application, nor to limit the scope of this application.
[0051] Embodiments of this application provide a planetary reducer and a drive system.
[0052] See Figure 3 The planetary reducer may include a planet carrier 300, a plurality of planet gears 200 mounted on the planet carrier 300 via pins 500, and a bearing 400 located between the inner bore 210 of the planet gears 200 and the pins 500.
[0053] The planetary reducer may also include a corrugated shim 100. Figure 3 , Figure 4 , Figure 5 , Figure 6 A first embodiment of a corrugated gasket is shown, which may be referred to as an L-shaped gasket.
[0054] Among them, see Figure 5 , Figure 6 The corrugated gasket 100 may include a first contact portion 110 and a second contact portion 120.
[0055] The first contact portion 110 is formed as a wave-shaped end face with crests 101 and troughs 102, and the crest 101 on one side along axis A forms the trough 102 on the other side along axis A. See also Figure 3 , Figure 4 Along axis A, one side of the first contact part 110 abuts against the planetary gear 200, and the other side abuts against the planet carrier 300.
[0056] See Figure 5 , Figure 6 The second contact portion 120 is integrally formed with the first contact portion 110 and is formed as a wavy circumferential surface with crests 101 and troughs 102. See also Figure 4 The second contact portion 120 is disposed in the inner hole 210 of the planetary gear 200. In the axial direction A, the axial end of the second contact portion 120 abuts against the bearing 400.
[0057] The wavy end face and circumferential surface create a line contact between the contacting surfaces, reducing wear. The second contact portion 120 allows it to replace the traditional spacer, preventing the bearing 400 from moving along the axial direction A. When the length of the planetary gear 200 changes, the axial length of the second contact portion 120 can be adjusted accordingly, resulting in a simple structure and low modification cost.
[0058] Figure 7 , Figure 8 , Figure 9 , Figure 10 , Figure 11 In a second embodiment of the wavy gasket 100, the gasket may be referred to as a stepped gasket.
[0059] See Figure 9 The corrugated gasket 100 also includes a third contact portion 130, which is integrally formed with the second contact portion 120 and has a corrugated end face with crests 101 and troughs 102. See also Figure 8 In the axial direction A, the third contact part 130 abuts against the bearing 400.
[0060] See Figure 8 The wavy contact surface design divides the lubricating oil at bearing 400 into two paths. One path flows from the inside of the wavy gasket 100 to the friction pair formed by bearing 400 and wavy gasket 100; the other path flows from the outside of the wavy gasket 100 to the friction pair formed by wavy gasket 100 and planetary carrier 300, ensuring a stable oil supply to each friction pair. See also Figure 3 , Figure 7 The pin 500 can be a hollow pin, and lubricating oil can flow from the pin hole 510 through its peripheral wall to the outer peripheral wall of the pin 500, and then flow into the two friction pairs.
[0061] See here. Figure 8 The inner diameter of the third contact part 130 can be slightly larger than the inner diameter of the bearing 400 (the outer diameter of the pin on which the planetary gear 200 is mounted).
[0062] The L-shaped gasket has a simple structure, while the third contact portion of the stepped gasket can increase stability. The specific implementation method can be selected according to needs. Both L-shaped and stepped gaskets can achieve axial A-limiting of the bearing 400 and separate the lubricating oil, ensuring a stable oil supply to each friction pair.
[0063] In one embodiment of this application, see Figure 4 , Figure 8 The first contact portion 110 is located outside the radial direction R of the second contact portion 120. See also Figure 8The third contact portion 130 is located inside the radial direction R of the second contact portion 120.
[0064] In one embodiment of this application, see Figure 10 The peaks 101 and troughs 102 are alternately arranged, and the peaks 101 at different positions have the same height, while the troughs 102 at different positions have the same depth, so that the tops of the multiple peaks 101 and the bottoms of the multiple troughs 102 respectively construct contact surfaces 103. It should be understood that the contact surface 103 is a virtual plane or circumferential surface.
[0065] In one embodiment of this application, the corrugated gasket 100 is made of a material that can be formed by stamping. The contact surfaces 103 formed by the tops of the multiple crests 101 and the contact surfaces 103 formed by the bottoms of the multiple troughs 102 can move towards each other under opposing pressure. This allows the corrugated structure to provide buffering for the transmission of axial force and to dynamically adjust the axial dimensions of the gasket required to limit the bearing 400 and the planetary gear 200. For example, the corrugated gasket is compressed in the axial direction A, thereby axially positioning the bearing 400 and the planetary gear 200.
[0066] For example, the corrugated gasket 100 can be made of steel, and the corrugated gasket 100 is obtained by stamping the steel plate. The stamping process is convenient and low in cost.
[0067] In one embodiment of this application, see Figure 4 , Figure 8 The contact surface 103 on the outer circumference formed by the multiple crests 101 of the second contact portion 120 is in clearance fit with the inner hole 210 of the planetary gear 200. The clearance fit ensures that there is no jamming in the radial direction R and guarantees the reliability of the limiting function in the axial direction A.
[0068] In one embodiment of this application, see Figure 3 , Figure 7 Two corrugated gaskets 100 are arranged in pairs on both sides of the axial direction A of the bearing 400. The corrugated gaskets 100 are directly placed on the outside of the bearing 400 for easy visual inspection and to prevent omissions. The paired corrugated gaskets 100 have the same structure, making production and assembly convenient.
[0069] The drive system provided in this application may include the aforementioned planetary reducer.
[0070] The above are preferred embodiments of this application. It should be noted that, for those skilled in the art, several improvements and modifications can be made without departing from the principles of this application, and these improvements and modifications should also be considered within the scope of protection of this application.
Claims
1. A planetary reduction gear comprising: Planet carrier; multiple planetary gears mounted on the planet carrier via pins; The bearing located between the inner bore of the planetary gear and the pin is characterized in that it further includes a corrugated washer, the corrugated washer comprising: The first contact portion is formed as a wavy end face with crests and troughs, and the crest on one side of the axial direction forms the trough on the other side of the axial direction. In the axial direction, one side of the first contact portion abuts against the planetary gear, and the other side abuts against the planet carrier. The second contact portion is integrally formed with the first contact portion and is formed as a wavy circumferential surface with crests and troughs. The second contact portion is disposed in the inner hole of the planetary gear, and in the axial direction, the axial end of the second contact portion abuts against the bearing.
2. The planetary reducer according to claim 1, characterized in that, The corrugated gasket also includes a third abutment portion, which is integrally formed with the second abutment portion and is formed into a corrugated end face with crests and troughs. In the axial direction, the third abutment portion abuts against the bearing.
3. The planetary reducer according to claim 1 or 2, characterized in that, The first contact portion is located radially outside the second contact portion.
4. The planetary reducer of claim 2, wherein, The third contact portion is located on the inner side of the second contact portion in the radial direction.
5. The planetary reducer according to claim 1 or 2, characterized in that, The wave crests and troughs are alternately arranged, and the convex height of the wave crests at different positions is the same, and the concave depth of the wave troughs at different positions is the same, so that the tops of the multiple wave crests and the bottoms of the multiple wave troughs respectively form contact surfaces.
6. The planetary reducer of claim 5, wherein, The wave-shaped gasket is made of a material that can be formed by stamping. The contact surfaces formed by the tops of the multiple wave crests and the contact surfaces formed by the bottoms of the multiple wave troughs can move towards each other under the action of opposing pressure.
7. The planetary reducer according to claim 5, characterized in that, The contact surface on the outer circumference formed by the multiple wave crests of the second contact portion is in clearance fit with the inner hole of the planetary gear.
8. The planetary reducer according to claim 1 or 2, characterized in that, The corrugated gasket is compressed in the axial direction, thereby axially positioning the bearing and the planetary gear.
9. The planetary reducer according to claim 1 or 2, characterized in that, Two of the corrugated gaskets are arranged in pairs on both sides of the bearing along its axial direction.
10. A drive system, characterized in that, The planetary reducer includes any one of claims 1 to 9.