CN220416151U

CN220416151U - Planetary gear, planetary gear assembly, differential and vehicle

Info

Publication number: CN220416151U
Application number: CN202322031385.5U
Authority: CN
Inventors: 冯玉鹏; 陈广全; 李兵; 韩毅毅
Original assignee: BYD Co Ltd
Current assignee: BYD Co Ltd
Priority date: 2023-07-28
Filing date: 2023-07-28
Publication date: 2024-01-30
Anticipated expiration: 2033-07-28

Abstract

The utility model provides a planetary gear, a planetary gear assembly, a differential and a vehicle, wherein the planetary gear is provided with a shaft hole, the planetary gear further comprises an end surface arranged around the shaft hole, and the end surface comprises a first annular area and a second annular area. The first annular region and the second annular region are sequentially arranged along the radial direction of the shaft hole, the first annular region is positioned between the shaft hole and the second annular region, the first annular region is positioned on the same spherical surface, and the second annular region is positioned in a region surrounded by the spherical surface where the first annular region is positioned. The first annular area of the end face that makes the formation is being close to the shaft hole is protruding outward to the centre of sphere, when planetary gear and gasket equipment, can make planetary gear and gasket laminate more, improves the laminating degree between planetary gear's the end face and the gasket, guarantees planetary gear and gasket's lubrication effect, improves differential mechanism's life.

Description

Planetary gear, planetary gear assembly, differential and vehicle

Technical Field

The present utility model relates generally to the technical field of differentials, and more particularly to a planetary gear, a planetary gear assembly, a differential and a vehicle.

Background

The planet gear spherical surface needs to be in contact with the inner spherical surface of the gasket, and sliding friction is formed between the planet gear spherical surface and the inner spherical surface of the gasket in the movement process of the differential mechanism. In the actual gasket production process, the problem of NVH (Noise, vibration, harshness, noise, vibration and harshness) of the whole vehicle is caused by heat treatment process of the gasket, abrasion of a gasket die (incoming materials are not easy to check) or ageing of the gasket, insufficient contact between the spherical surface of the planetary gear and the inner surface of the gasket is caused, point lubrication is easy to occur, the edge of the gasket is easy to contact with the planetary gear, a lubricating oil film is not formed between the gasket and the planetary gear, stress concentration of the gasket is caused, abrasion of the gasket is caused, abnormal sound occurs more seriously, and the problem of NVH (noise vibration and harshness) of the planetary gear is caused.

In the related art, steel balls and baffle plates are arranged between the spherical surface of the planetary gear and the spherical surface of the gasket, so that better friction fit between the planetary gear and the gasket can be realized to a certain extent, but the whole structure is complex, the cost is high, the maintenance is difficult, and the planetary gear is not suitable for a differential mechanism with a compact structure.

Accordingly, there is a need to provide a planetary gear, a planetary gear assembly, a differential, and a vehicle to at least partially address the above-described problems.

Disclosure of Invention

In the summary, a series of concepts in a simplified form are introduced, which will be further described in detail in the detailed description. The summary of the utility model is not intended to define the key features and essential features of the claimed subject matter, nor is it intended to be used as an aid in determining the scope of the claimed subject matter.

To at least partially solve the above-described problems, a first aspect of the present utility model provides a planetary gear for a differential, the planetary gear having a shaft hole, the planetary gear including an end face disposed around the shaft hole, the end face including a first annular region and a second annular region;

the first annular region and the second annular region are sequentially arranged along the radial direction of the shaft hole, the first annular region is positioned between the shaft hole and the second annular region, the first annular region is positioned on the same spherical surface, and the second annular region is positioned in a region surrounded by the spherical surface where the first annular region is positioned.

According to the planetary gear, the middle part of the end face protrudes outwards, when the planetary gear is assembled with the gasket, the planetary gear can be attached to the gasket, the attaching degree between the end face of the planetary gear and the gasket is improved, the lubricating effect of the planetary gear and the gasket is ensured, and the service life of the differential mechanism is prolonged.

Optionally, the cross-sectional shape of the second annular region is arc-shaped; and/or

The edge of the second annular region far away from the first annular region is different from the spherical surface where the first annular region is located by 0.13-0.17 mm.

Optionally, the end face further includes a third annular region connected between the first annular region and the shaft bore;

the third annular region is located in a region surrounded by the sphere where the first annular region is located.

Optionally, the cross-sectional shape of the third annular region is arc-shaped; and/or

The edge of the third annular region far away from the first annular region is different from the spherical surface corresponding to the first annular region by 0.13-0.17 mm.

Optionally, the area of the first annular region is 50% to 75% of the area of the end face.

Optionally, the planetary gear further includes an avoidance surface disposed around the shaft hole, and the end surface is located between the avoidance surface and the shaft hole;

the planetary gear further comprises a transition surface connected with the avoidance surface and the end surface, one end of the transition surface is in smooth connection with the avoidance surface, the other end of the transition surface is connected with the second annular area to form an included angle, and a step part is formed at the position of the transition surface.

A second aspect of the present utility model provides a planetary gear assembly comprising:

a planetary gear according to a first aspect of the utility model, and

a gasket configured as an annular curved sheet-like structure, the gasket comprising:

the first curved part is provided with a through hole, and the first curved part is positioned on the same spherical surface; and

a second curved portion connected to a circumferential outer edge of the first curved portion, and configured to be bent from the outer edge by a predetermined angle in a direction of a center of a sphere where the first curved portion is located;

when the gasket and the planetary gear are assembled, the through hole and the shaft hole are coaxial, and the first curved part is attached to the first annular area.

According to the planetary gear assembly, when the gasket and the planetary gears are assembled, the outer edge of the gasket is bent towards the direction of the planetary gears, so that the gasket and the planetary gears can be more attached, and when the planetary gear assembly is applied to a differential mechanism and a vehicle, the edge of the gasket can be far away from a differential mechanism shell, the abrasion of the differential mechanism is reduced, and vibration and noise are reduced.

Optionally, the predetermined angle is 3 ° to 8 °.

Optionally, the width of the second curved part is 5 mm-10 mm; and/or

The gasket is an integrally formed member.

Optionally, an outer edge of the gasket exceeds an outer edge of the end face.

A third aspect of the utility model provides a differential comprising a planetary gear assembly according to the second aspect of the utility model.

A fourth aspect of the utility model provides a vehicle comprising the differential according to the third aspect of the utility model.

Drawings

The following drawings of embodiments of the present utility model are included as part of the utility model. Embodiments of the present utility model and their description are shown in the drawings to explain the principles of the utility model. In the drawings of which there are shown,

FIG. 1 is a schematic perspective view of a planetary gear assembly according to a preferred embodiment of the present utility model;

FIG. 2 is another perspective view of a planetary gear assembly according to a preferred embodiment of the present utility model;

FIG. 3 is a schematic cross-sectional view of the gasket of FIG. 2;

FIG. 4 is a schematic cross-sectional view of the planetary gear of FIG. 2;

FIG. 5 is an enlarged schematic view of the structure shown at A in FIG. 4; and

fig. 6 is a second structural schematic diagram of a planetary gear according to a preferred embodiment of the present utility model.

Reference numerals illustrate:

100: planetary gear 110: end face

111: first annular region 112: a second annular region

113: third annular region 120: transition surface

130: avoidance surface 140: shaft hole

150: step 200: gasket

210: the through hole 220: a first curved part

230: second curved part

Detailed Description

In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the present utility model. It will be apparent, however, to one skilled in the art that embodiments of the utility model may be practiced without one or more of these details. In other instances, well-known features have not been described in detail in order to avoid obscuring the embodiments of the utility model.

In the following description, a detailed structure will be presented for a thorough understanding of embodiments of the present utility model. It will be apparent that embodiments of the utility model may be practiced without limitation to the specific details that are set forth by those skilled in the art. The preferred embodiments of the present utility model are described in detail below, however, the present utility model may have other embodiments in addition to the detailed description, and should not be construed as limited to the embodiments set forth herein.

It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model, as the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms "comprises," "comprising," and/or "including," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. The terms "upper", "lower", "front", "rear", "left", "right" and the like are used herein for illustrative purposes only and are not limiting.

Ordinal numbers such as "first" and "second" cited in the present utility model are merely identifiers and do not have any other meaning, such as a particular order or the like. Also, for example, the term "first component" does not itself connote the presence of "second component" and the term "second component" does not itself connote the presence of "first component".

Hereinafter, specific embodiments of the present utility model will be described in more detail with reference to the accompanying drawings, which illustrate representative embodiments of the present utility model and not limit the present utility model.

The present utility model provides a planetary gear 100, a planetary gear assembly, a differential and a vehicle. Wherein the differential and the vehicle comprise a planetary gear assembly. The planetary gear assembly includes a planetary gear 100 and a spacer 200. The planetary gear 100 is provided with the end face 110 for contacting the gasket 200, and the end face 110 of the planetary gear 100 is protruded outwards near the middle of the shaft hole 140, so that when the planetary gear 100 and the gasket 200 are assembled, the gasket 200 can be attached to the planetary gear 100 more, the attaching degree between the end face 110 of the planetary gear 100 and the gasket 200 is improved, the lubricating effect of the planetary gear 100 and the gasket 200 is ensured, and the service life of the differential mechanism is prolonged.

The structure of the planetary gear assembly of the present utility model will be described with reference to the embodiment shown in fig. 1 to 5.

Referring to fig. 1 and 2, the planetary gear assembly includes a planetary gear 100 and a spacer 200.

First, the structure of the gasket 200 will be described. Referring to fig. 2 and 3, the spacer 200 of the planetary gear assembly is constructed in a ring-shaped curved sheet-like structure. Gasket 200 includes a first curved portion 220 and a second curved portion 230. Wherein the first curved portion 220 is formed with a through hole 210, and the through hole 210 of the spacer 200 and the shaft hole 140 of the planetary gear 100 are coaxial when the spacer 200 and the planetary gear 100 are mounted together. The first curved portion 220 is on the same spherical surface.

The second curved portion 230 is connected to the circumferential outer edge of the first curved portion 220, and the second curved portion 230 is configured to be bent at a predetermined angle from the circumferential outer edge of the first curved portion 220 toward the direction of the center of the sphere where the first curved portion 220 is located.

When the planetary gear assembly is applied to a differential, the spacer 200 and the planetary gear 100 are mounted together, and the spacer 200 is located between the planetary gear 100 and the differential case. The first curved portion 220 at least partially conforms to the end face 110 of the planetary gear 100. The second curved portion 230 is closer to the end face 110 of the planetary gear 100 than the differential case, and the distance between the spacer 200 and the differential case at the circumferential outer edge position can be increased, reducing friction between the circumferential outer edge of the spacer 200 and the differential case, thereby reducing differential wear, and reducing vibration and noise. And the service life of the differential mechanism can be prolonged. And the edge of the spacer 200 is bent toward the planetary gear 100, the spacer 200 (at the second curved portion 230) may be further attached to the planetary gear 100. The outer edge of the spacer 200 is also easily brought into contact with the planetary gears, and a lubricating oil film is easily formed between the spacer and the planetary gears.

In this embodiment, the predetermined angle may be 3 ° to 8 °. Preferably, the second curved portion 230 is bent at an angle of 5 ° with respect to the circumferential outer edge of the first curved portion 220 toward the center of the sphere corresponding to the first curved portion 220.

Preferably, the width of the second curved portion 230 is 5mm to 10mm. The first curved portion 220 and the second curved portion 230 are each configured in a ring-like structure, and the width of the second curved portion 230 refers to the width of the ring-like surface.

Gasket 200 may be an integrally formed member, simple in process and easy to manufacture.

The structure of the planetary gear 100 of the present utility model will be described with reference to fig. 4 to 6.

Referring to fig. 4 and 5, the planetary gear 100 has a shaft hole 140. The planetary gear 100 also includes an end face 110 disposed around the shaft bore 140.

The end surface 110 includes a first annular region 111 and a second annular region 112 that are disposed in order in the radial direction of the shaft hole 140. The first annular region 111 is a portion near the shaft hole 140. The first annular region 111 is on the same sphere, i.e. the portion of the end face 110 corresponding to the first annular region 111 is configured as a part of a sphere.

In this embodiment, the first annular region 111 and the second annular region 112 are connected. The second annular region 112 is located at an edge (near the teeth) away from the shaft hole 140, and the second annular region 112 is located within a region surrounded by the spherical surface where the first annular region 111 is located, in other words, the second annular region 112 is closer to the center of the spherical surface than the spherical surface corresponding to the first annular region 111.

In other embodiments of the utility model, not shown, the first annular region 111 and the second annular region 112 may also be connected by an intermediate connection surface.

In this way, the middle region (first annular region 111) of the end face 110 of the planetary gear 100 near the shaft hole 140 protrudes further outward (in a direction away from the center of the sphere). When the planetary gear 100 is assembled with the spacer 200, the spacer 200 can be more attached to the planetary gear 100, and the lubrication effect of the planetary gear 100 and the spacer 200 is ensured. When the differential mechanism is applied to the differential mechanism, the service life of the differential mechanism can be prolonged.

According to an example of the present utility model, the second annular region 112 is also configured as a curved surface, wherein the cross-sectional shape of the second annular region 112 is arc-shaped, the second annular region 112 may be configured as a part of a spherical surface (another), and the second annular region 112 may also be a generally curved surface (a part of an aspherical surface).

The outer edge of the second annular region 112 remote from the first annular region 111 differs from the sphere on which the first annular region 111 is located by 0.13mm to 0.17mm. Preferably, the outer edge of the second annular region 112 differs from the spherical surface corresponding to the first annular region 111 by 0.15mm. The first annular region 111 projects a portion further outward than the second annular region 112 so that the end face 110 of the planetary gear 100 can closely conform to the inner surface of the spacer 200 when the planetary gear 100 and the spacer 200 are assembled. And the problem that the contact between the spherical surface of the planetary gear and the inner surface of the gasket is insufficient due to the problems of the heat treatment process of the gasket, the abrasion of a gasket die (the incoming materials are not easy to check) or the aging of the gasket in the production process of the gasket can be solved.

In the present utility model, the planetary gear 100 is tightly adhered to the inner surface of the spacer 200, specifically, the first curved portion 220 of the first annular region 111 is adhered. This means that the sphere corresponding to the first annular region 111 is approximately the same size as the sphere corresponding to the first curved portion 220 of the gasket 200.

Preferably, the area of the sphere corresponding to the first annular region 111 is 50% -75% of the area of the end face 110. The degree of adhesion between the planetary gear 100 and the spacer 200 is effectively improved to be more than 50%.

Referring to another embodiment of the planetary gear 100 shown in fig. 6, the end face 110 includes a third annular region 113, a first annular region 111, and a second annular region 112 that are sequentially connected from an inner edge (near the shaft hole 140) to an outer edge (near the teeth). The third annular region 113 is also located in a region surrounded by the spherical surface where the first annular region 111 is located, and the third annular region 113 is closer to the center of the spherical surface than the spherical surface where the first annular region 111 is located.

The cross-sectional shape of the third annular region 113 may be configured as an arc, i.e., the third annular region 113 is configured as a curved surface. The edge of the third annular region 113 remote from the first annular region 111 (i.e. the inner edge of the end face 110) differs from the sphere on which the first annular region 111 is located by 0.13mm to 0.17mm. This dimensional difference ensures, on the one hand, that the inner surface of the spacer 200 is as close as possible to the planet gears, and on the other hand is easy to implement in terms of technology.

Preferably, the edge of the third annular region 113 remote from the first annular region 111 differs from the sphere on which the first annular region 111 is located by 0.15mm. In fig. 5 and 6, the distance L1 between the outer edge of the end face 110 and the spherical surface where the first annular region 111 is located is 0.15mm, and in fig. 6, the distance L2 between the inner edge of the end face 110 and the spherical surface where the first annular region 111 is located is 0.15mm.

The first annular region 111 projects a part further outward (in a direction away from the center of sphere) than the second annular region 112 and the third annular region 113, so that the spherical surface of the first annular region 111 closely conforms to the inner surface of the spacer 200 when the planetary gear 100 and the spacer 200 are assembled.

The first annular region 111 and the second annular region 112 are smoothly connected. The first annular region 111 is smoothly connected with the third annular region 113. The second annular region 112 and the third annular region 113 may also be linear, and may specifically be flexibly selected according to actual needs.

The outer edge of the gasket 200 (the circumferential outer edge of the second curved portion 230) exceeds the outer edge of the end face 110 in this embodiment. In order to reduce friction between the outer edge portion of the spacer 200 and the planetary gear 100, the planetary gear 100 further includes a relief surface 130 in this embodiment. Referring to fig. 4 and 5, the relief surface 130 is a tapered surface, and the relief surface 130 is farther from the axis 140 than the end surface 110.

The relief surface 130 and the end surface 110 are connected by a transition surface 120. The transition surface 120 is configured as an annular connection surface between the connected relief surface 130 and the end surface 110, one end of the transition surface 120 is smoothly connected to the relief surface 130, and the other end of the transition surface 120 is connected to the second annular region 112 and forms an included angle. The planetary gear 100 is formed with the stepped portion 150 at the position of the transition surface 120 so that the outer edge portion of the spacer 200 does not contact the relief surface 130, thereby protecting the spacer 200 and the planetary gear 100 well and reducing wear.

The differential and the vehicle of the utility model both comprise the planetary gear assembly of the utility model, and have the same advantages as the planetary gear assembly, and are not described in detail.

Unless defined otherwise, technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this utility model pertains. The terminology used herein is for the purpose of describing particular implementations only and is not intended to be limiting of the utility model. Terms such as "disposed" or the like as used herein may refer to either one element being directly attached to another element or one element being attached to another element through an intermediate member. Features described herein in one embodiment may be applied to another embodiment alone or in combination with other features unless the features are not applicable or otherwise indicated in the other embodiment.

The present utility model has been described in terms of the above embodiments, but it should be understood that the above embodiments are for purposes of illustration and description only and are not intended to limit the utility model to the embodiments described. Those skilled in the art will appreciate that many variations and modifications are possible in light of the teachings of the utility model, which variations and modifications are within the scope of the utility model as claimed.

Claims

1. A planetary gear for a differential, the planetary gear having a shaft bore, the planetary gear comprising an end face disposed about the shaft bore, the end face comprising a first annular region and a second annular region;

2. The planetary gear according to claim 1, wherein the cross-sectional shape of the second annular region is an arc; and/or

3. The planetary gear according to claim 1, wherein the end face further comprises a third annular region connected between the first annular region and the shaft hole;

4. A planetary gear according to claim 3, wherein the third annular region is arcuate in cross-sectional shape; and/or

5. The planetary gear according to any one of claims 1 to 4, wherein the area of the first annular region is 50% to 75% of the area of the end face.

6. The planetary gear according to claim 1, further comprising a relief surface disposed around the shaft hole, the end surface being between the relief surface and the shaft hole;

7. A planetary gear assembly, the planetary gear assembly comprising:

the planetary gear according to any one of claims 1 to 6, and

8. The planetary gear assembly according to claim 7, wherein the predetermined angle is 3 ° to 8 °.

9. The planetary gear assembly according to claim 7, wherein the width of the second curved portion is 5mm to 10mm; and/or

The gasket is an integrally formed member.

10. The planetary gear assembly according to claim 7, wherein an outer edge of the shim exceeds an outer edge of the end face.

11. A differential comprising a planetary gear assembly according to any one of claims 7 to 10.

12. A vehicle, characterized in that it comprises a differential as claimed in claim 11.