Multi-connection planetary gear and internal transmission

Abstract

The utility model relates to the technical field of internal transmissions, and discloses a multi-connection planetary gear which comprises a gear body, the gear body is composed of three stages or more than three stages of gears through a mold forming process, and the gears are coaxially and sequentially arranged from small to large according to the diameters of the gears and are integrally formed. The gears comprise a minimum gear arranged in the front, a maximum gear arranged at the last and more than one middle gear arranged between the minimum gear and the maximum gear arranged at the last, and the minimum gear and the middle gear have the same tooth number and different tooth modulus. The multi-connection planetary gear is convenient and fast to produce and machine, the whole multi-connection planetary gear can obtain good strength, the largest middle gear can be meshed with an inner gear ring of an inner transmission during installation, and due to the fact that gear teeth of the largest middle gear can be set to be large, good transmission strength can be provided, and the service life is long. The utility model further discloses an internal transmission comprising the multi-connection planetary gear.

Description

Technical Field

[0001] The utility model relates to the technical field of internal transmissions, and particularly relates to a multi-stage planetary gear and an internal transmission. Background Art

[0002] In an internal transmission, the multi-stage planetary gear undertakes an important transmission function: when the internal transmission shifts to different gears, the corresponding different sun gears are locked. When an external force drives the input member to rotate, the planet carrier is driven to rotate, and the corresponding gears on the multi-stage planetary gear rotate around the locked sun gear, driving the entire multi-stage planetary gear to rotate accordingly. The internal gear ring meshing with the multi-stage planetary gear also rotates accordingly, thereby driving the output member to rotate. It should be particularly noted that one of the gears on the multi-stage planetary gear meshes with the internal gear ring, so this gear on the multi-stage planetary gear often bears the load.

[0003] However, for the multi-stage planetary gear of the traditional internal transmission, the number of teeth of each stage of gear is different, and it is produced by a cutting process. The production method is time-consuming and cumbersome, and the gear meshing with the internal gear ring is particularly prone to long-term damage, and the service life of the entire multi-stage planetary gear is short.

[0004] Therefore, it is necessary to propose a new type of multi-stage planetary gear and internal transmission to solve the above problems, that is, to solve the problems that the production method of the multi-stage planetary gear of the traditional internal transmission is time-consuming and cumbersome, the gear meshing with the internal gear ring is particularly prone to damage, and the service life of the entire multi-stage planetary gear is short. Summary of the Invention

[0005] The utility model provides a multi-stage planetary gear and an internal transmission to solve the problems that the production method of the multi-stage planetary gear of the traditional internal transmission is time-consuming and cumbersome, the gear meshing with the internal gear ring is particularly prone to damage, and the service life of the entire multi-stage planetary gear is short.

[0006] The technical problems solved by the utility model are realized by adopting the following technical solutions:

[0007] A multi-stage planetary gear includes a gear main body, which is composed of three or more gears by a die forming process, and is integrally formed coaxially and arranged in order of increasing gear diameter from small to large. The gears include the smallest gear at the front, the largest gear at the end, and one or more intermediate gears located between the smallest gear and the largest gear at the end. The number of teeth of the smallest gear is the same as that of the intermediate gears, but the module of the teeth is different.

[0008] Furthermore, the teeth of the smallest gear and the intermediate gears are aligned with each other.

[0009] Furthermore, starting from the smallest gear and counting towards the largest gear, the number of teeth of the third gear or more is twice that of the adjacent previous gear.

[0010] Furthermore, the shape of the smallest gear is the same as that of the middle gear.

[0011] Furthermore, the gear modules of the smallest gear and the middle gear increase in order from large to small.

[0012] Furthermore, the gear body is a multi-stage spur gear.

[0013] Furthermore, the gear further includes a largest gear disposed behind the middle gear, and the largest gear has more teeth than the other gears.

[0014] Furthermore, every other tooth of the largest gear is aligned with the tooth position of the front gear.

[0015] An internal transmission further includes the above multi-stage planetary gear.

[0016] Furthermore, it further includes an internal gear ring, and the internal gear ring meshes with the largest middle gear.

[0017] The beneficial effects of the present utility model are as follows:

[0018] In the present utility model, the gear body is integrally formed by arranging three or more gears coaxially in ascending order of gear diameter through a die forming process. The smallest gear and the middle gear have the same number of teeth but different tooth modules. The production and processing are suitable for die forming, which is convenient, fast and has lower costs. The overall extrusion forming can obtain good strength. During installation, the largest middle gear can mesh with the internal gear ring of the internal transmission. Since the teeth of the largest middle gear can be set relatively large, good transmission strength can be provided and the service life is long. Description of the Drawings

[0019] In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0020] Figure 1 It is a three-dimensional view of the internal transmission of the present utility model.

[0021] Figure 2 It is a cross-sectional view of the internal transmission of the present utility model.

[0022] Figure 3 It is a combined structural schematic diagram of the multi-stage planetary gear and the sun gear of the present utility model.

[0023] Figure 4This is a three-dimensional view of the multi-stage planetary gear of the present utility model.

[0024] Figure 5 This is a front view of the multi-stage planetary gear of the present utility model.

[0025] Wherein:

[0026] 100 - gear body, 1 - gear, 11 - smallest gear, 12 - medium gear, 13 - largest gear;

[0027] 200 - internal gear ring;

[0028] 300 - core shaft, 310 - shifting component, 320 - pawl, 330 - sun gear, 340 - input component, 350 - planet carrier, 360 - clutch, 370 - output component. Detailed implementation manner

[0029] In order to make the technical means, creative features, achieved purposes and effects realized by the present utility model easy to understand, the present utility model will be further described below with reference to specific drawings.

[0030] See Figures 1 to 5 , a multi-stage planetary gear, including a gear body 100, the gear body 100 is formed by a die forming process from three or more stages of gears 1, and is integrally formed coaxially in ascending order of gear diameter. The gear 1 includes a smallest gear 11 arranged in the front, a largest gear 13 at the end, and one or more medium gears 12 located between the smallest gear 11 and the largest gear 13 at the end. The smallest gear 11 and the medium gear 12 have the same number of teeth but different tooth modules.

[0031] The production and processing of this multi-stage planetary gear is suitable for die forming, which is convenient, fast and has lower cost. The overall extrusion forming can obtain good strength. When installed, the largest medium gear 12 can be meshed with the internal gear ring 200 of the internal transmission. Since the teeth of the largest medium gear 12 can be set relatively large, good transmission strength can be provided and the service life is long.

[0032] Specifically, when in use, the shifting component 310 is manipulated to drive the pawl control ring to control the opening and closing of the pawl 320 on the core shaft 300. When the pawl 320 is retracted, the sun gear 330 and the multi-stage planetary gear rotate freely. When the input component 340 inputs torque, it first passes through the planet carrier 350. The rotational speed of the planet carrier 350 is higher than that of the internal gear ring 200. Then the clutch 360 engages to synchronize the rotational speeds of the planet carrier 350 and the internal gear ring 200. The torque of the planet carrier 350 is transmitted to the internal gear ring 200, and is output to the wheel through the output component 370 by the internal gear ring 200. At this time, the internal transmission does not go through the planetary gear mechanism for speed change.

[0033] When the pawl 320 is open, it is in other gears, and one of the sun gears 330 is locked. After the input member 340 inputs torque, it first passes through the planet carrier 350. The rotation of the planet carrier 350 drives the multi-link planet gears to rotate. One of the sun gears 330 meshes with the multi-link planet gears, and the largest middle gear 12 meshes with the internal gear ring 200. Since the teeth of the largest middle gear 12 can be set relatively large, good transmission strength can be provided and the service life is long. Since the rotational speed of the internal gear ring 200 is higher than that of the planet carrier 350, the clutch 360 disengages, and the torque of the internal gear ring 200 is output to the wheel through the output member 370. At this time, the internal transmission is shifted through the planetary gear mechanism.

[0034] The teeth of the smallest gear 11 are aligned with the teeth of the middle gear 12. This facilitates the integrated molding process of the mold.

[0035] Counting from the smallest gear to the largest gear, the number of teeth of the third gear or more than the third gear is twice that of the adjacent previous gear. This facilitates the tooth number design.

[0036] The shape of the smallest gear 11 is the same as that of the middle gear 12.

[0037] The gear modules of the smallest gear 11 and the middle gear 12 increase in order from large to small. This can ensure that the largest middle gear 12 can obtain high strength.

[0038] The gear body 100 is a multi-link spur gear. This facilitates the integrated molding process of the mold.

[0039] The gear 1 further includes a largest gear 13 disposed behind the middle gear 12, and the largest gear 13 has more teeth than the other gears 1. This can make the corresponding smallest sun gear 330 smaller, and since the largest middle gear 12 meshes with the internal gear ring 200, the largest gear 13 can extend outside the edge of the internal gear ring 200, making it more compact.

[0040] Every other tooth of the largest gear 13 is aligned with the tooth position of the front gear 1. This facilitates the integrated molding process of the mold.

[0041] An internal transmission further includes the above multi-link planetary gears.

[0042] It further includes an internal gear ring 200, and the internal gear ring 200 meshes with the largest middle gear 12.

[0043] The foregoing has shown and described the basic principles, main features and advantages of the present utility model. Those skilled in the art should understand that the present utility model is not limited by the above embodiments, and what is described in the above embodiments and the specification only illustrates the principles of the present utility model. Without departing from the spirit and scope of the present utility model, the present utility model will have various changes and improvements, and these changes and improvements all fall within the scope of the present utility model claimed. The scope of protection claimed by the present utility model is defined by the appended claims and their equivalents.

Claims

1. A multi-stage planetary gear, comprising a gear body (100), the gear body (100) being composed of three or more stages of gears (1) through a die-casting process, and being integrally formed by coaxially arranging the gears in ascending order of gear diameter, characterized in that: The gear (1) includes a smallest gear (11) disposed at the front, a largest gear (13) at the rear, and one or more intermediate gears (12) located between the smallest gear (11) and the largest gear (13) at the rear. The smallest gear (11) and the intermediate gears (12) have the same number of teeth but different tooth modules.

2. The multi-stage planetary gear according to claim 1, characterized in that: The teeth of the smallest gear (11) are aligned with the teeth of the intermediate gears (12) in position.

3. The multi-stage planetary gear according to claim 1 or 2, characterized in that: Counting from the smallest gear to the largest gear, the number of teeth of the third gear or more than the third gear is twice that of the immediately preceding gear.

4. The multi-stage planetary gear according to claim 1, characterized in that: The shape of the smallest gear (11) is the same as that of the intermediate gears (12).

5. The multi-stage planetary gear according to claim 1, wherein: The gear modules of the smallest gear (11) and the intermediate gears (12) increase successively from small to large.

6. The multi-stage planetary gear according to claim 1, characterized in that: The gear body (100) is a multi-stage spur gear.

7. The multi-stage planetary gear according to claim 1, wherein: The gear (1) further includes a largest gear (13) disposed behind the intermediate gears (12), and the largest gear (13) has more teeth than the rest of the gears (1).

8. The multi-link planetary gear according to claim 7, characterized in that: The teeth of the largest gear (13) are aligned with the teeth of the front gear (1) at every other interval.

9. An internal transmission, characterized in that: It further includes the multi-stage planetary gear according to any one of claims 1 to 8.

10. The internal transmission according to claim 9, characterized in that: It further includes an internal gear ring (200), and the internal gear ring (200) meshes with the largest intermediate gear (12).

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