A three-row six-speed planetary gearbox and power device

Abstract

The invention discloses a three-row six-speed planetary gearbox and a power device. The three-row six-speed planetary gearbox comprises: an input shaft, an output shaft, a planetary gear train and a clutch; the planetary gear train comprises a primary planetary gear train, a secondary planetary gear train and a tertiary planetary gear train which are sequentially connected in transmission. Compared with a traditional gearbox which shifts gears through a shift fork, a coupling and a sliding gear, the three-row six-speed planetary gearbox has a compact structure, a large transmission ratio range and a large transmission torque.

Description

Technical Field

[0001] The present invention relates to the field of gearboxes, and in particular to a three-row six-speed planetary gearbox and a power device. Background Art

[0002] The gearbox is a widely used transmission device. It is used to connect the drive device and the working device. The traditional gearbox shifts gears through a fork, a coupling, and a sliding gear. Compared with the planetary transmission, this transmission method is large in size and has a small transmission ratio range. To achieve a larger transmission ratio, it is necessary to add multiple transmissions, which will inevitably increase the space occupied.

[0003] There are many existing gearboxes with planetary transmission structures, but there are also many problems. For example, the more advanced bulldozer power transmission system gearbox uses a four-row six-speed gearbox, which has mature technology, but there is still room for improvement in structure and lightweight.

[0004] Chinese patent CN106884936B discloses a three-planetary gear six-speed automatic transmission. Figure 1 As shown, the three-planet row six-speed automatic transmission includes: a first planet row 1, a second planet row 2 and a third planet row 3; the first planet row 1 includes a first ring gear 11, a first inner planetary gear set 13 and a first outer planetary gear set 12 meshing with each other, a first sun gear 15 and a first planet carrier 14; the second planet row 2 includes a second ring gear 21, a second planetary gear set 23, a second sun gear 24 and a second planet carrier 22; the third planet row 3 includes a third ring gear 31, a third planetary gear set 32, a third sun gear 34 and a third planet carrier 33; the second planet row 2 is located between the first planet row 1 and the third planet row 3. However, the three-planet row six-speed automatic transmission has only one reverse gear and has more torque transmission components, so the manufacturing cost is relatively high.

[0005] Therefore, providing a gearbox with a smaller volume and lower manufacturing cost is a technical problem that needs to be solved urgently. Summary of the invention

[0006] In view of the above problems, an object of the present invention is to provide a three-row six-speed planetary transmission and a power device for solving at least one of the above problems.

[0007] In order to achieve the above object, the present invention provides a three-row six-speed planetary gearbox and a power device, the three-row six-speed planetary gearbox comprising:

[0008] An input shaft, an output shaft, a planetary gear train, a first clutch, a second clutch, and a third clutch;

[0009] The planetary gear train comprises a primary planetary gear train, a secondary planetary gear train and a tertiary planetary gear train which are sequentially connected in transmission.

[0010] In an embodiment, the first-stage planetary gear train includes a first-stage sun gear, a first-stage planetary gear and a first-stage ring gear; the second-stage planetary gear train includes a second-stage sun gear, a second-stage planetary gear and a second-stage ring gear; the third-stage planetary gear train includes a third-stage sun gear, a third-stage planetary gear and a third-stage ring gear.

[0011] In an embodiment, the primary sun gear is connected to the input shaft through transmission, the primary planetary gear is arranged on the primary planetary carrier, and the primary planetary carrier is connected to the first clutch.

[0012] In an embodiment, the secondary sun gear is connected to the input shaft, the secondary planetary gear is arranged on the primary ring gear, and the secondary ring gear is connected to the second clutch.

[0013] In an embodiment, the three-stage sun gear is connected to the primary ring gear, the inner ring gear is connected to the primary ring gear via the third clutch, and the three-stage planetary gear is connected to the output shaft.

[0014] In an embodiment, the three-stage planetary gear train adopts NW type transmission.

[0015] Compared with the traditional gearbox that shifts gears through a shift fork, a coupling, and a sliding gear, the three-row six-speed planetary gearbox has a compact structure, a wide transmission ratio range, and a large transmission torque. Compared with the existing advanced bulldozer power transmission system gearbox, the present invention reduces a first-stage sun gear through NW-type planetary transmission, simplifies the structure, and reduces the overall weight of the gearbox.

[0016] Compared with the Chinese patent CN106884936B involved in the background technology, a three-planetary-row six-speed automatic transmission is disclosed. The three-planetary-row six-speed automatic transmission has 6 forward gears and 1 reverse gear, while the three-row six-speed planetary transmission of the present application has 3 forward gears and 3 reverse gears; the three-planetary-row six-speed automatic transmission has 3 torque transmission components and 2 brake components, while the present application has 1 torque transmission component and 4 brake components; and the three-planetary-row six-speed automatic transmission is mainly aimed at automobiles, and can cope with complex driving conditions. It has 6 forward gear speeds available for switching, and retains 1 reverse gear; while the three-row six-speed planetary transmission of the present application is mainly aimed at engineering machinery operating conditions, providing 3 forward gears and 3 reverse gears.

[0017] The present invention also discloses a power device, which includes a driving device and a three-row six-speed planetary gearbox connected to the driving device, wherein the driving device includes an engine and an electric motor.

[0018] With reference to the following description and accompanying drawings, specific embodiments of the present invention are disclosed in detail, indicating the manner in which the principles of the present invention can be adopted. It should be understood that the embodiments of the present invention are not limited in scope. Within the spirit and scope of the appended claims, the embodiments of the present invention include many changes, modifications and equivalents.

[0019] Features described and / or illustrated with respect to one embodiment may be used in the same or similar manner in one or more other embodiments, combined with features in other embodiments, or substituted for features in other embodiments.

[0020] It should be emphasized that the term “include / comprises” when used herein refers to the presence of features, integers, steps or components, but does not exclude the presence or addition of one or more other features, integers, steps or components. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without paying any creative work.

[0022] Figure 1 It is a structural schematic diagram of a three-planetary gear six-speed automatic transmission disclosed in the prior art;

[0023] Figure 2 A schematic diagram of the structure of a three-row six-speed planetary transmission provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0024] The technical solution of the present invention will be described in detail below in conjunction with the accompanying drawings and specific implementation methods. It should be understood that these implementation methods are only used to illustrate the present invention and are not used to limit the scope of the present invention. After reading the present invention, various equivalent forms of modifications to the present invention by those skilled in the art all fall within the scope defined by the claims attached to this application.

[0025] It should be noted that when an element is referred to as being "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0026] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those generally understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0027] The present invention discloses a three-row six-speed planetary gearbox. The three-row six-speed planetary gearbox includes: an input shaft, an output shaft, a planetary gear train, and a first clutch (i.e., clutch 6I in the attached figure), a second clutch (i.e., clutch 6II in the attached figure), a third clutch (i.e., clutch 6III in the attached figure), 6IV and 6V; the planetary gear train includes a primary planetary gear train, a secondary planetary gear train and a tertiary planetary gear train that are sequentially connected in transmission. The primary planetary gear train includes a primary sun gear 2a, a primary planetary gear 2c and a primary ring gear 2b; the secondary planetary gear train includes a secondary sun gear 3a, a secondary planetary gear 3c and a secondary ring gear 3b; the tertiary planetary gear train includes a tertiary sun gear 4a, a tertiary planetary gear 4c and tertiary ring gears 4b and 5b.

[0028] The primary sun gear 2a is connected to the input shaft 1 through a key or spline. The four primary planetary gears 2c are mounted on the primary planet carrier 2h through pins. The primary planet carrier 2h is connected to the first clutch (i.e., clutch 6I in the figure) through a spline.

[0029] The secondary sun gear 3a is connected to the input shaft 1 through a key or spline. The primary ring gear 2b also functions as a secondary planet carrier, and the four secondary planetary gears 3c are mounted on the primary ring gear 2b through pins. The secondary ring gear 3b is connected to the second clutch (i.e., clutch 6Ⅱ in the figure) through a spline.

[0030] The third planetary gear train adopts NW type transmission, and a third-stage gear ring 4b inner gear ring is added on the basis of NW type transmission. The third-stage sun gear 4a is connected to the first-stage gear ring 2b, i.e., the second-stage planet carrier, through a key or spline. The third-stage gear ring 4b is connected to the first-stage gear ring 2b, i.e., the second-stage planet carrier, through a third clutch (i.e., clutch 6Ⅲ in the figure). The third-stage planetary gear 4c rotates synchronously with the planetary gear 5c, and is connected to the third-stage planet carrier, i.e., the output shaft 7, through a bearing.

[0031] In order to make it easier for those skilled in the art to understand the technical solution of at least one embodiment of the present application, the structure, working principle and transmission direction of a three-row six-speed planetary transmission disclosed in the present application will be described in detail below.

[0032] Clutches 6Ⅰ and 6Ⅱ are respectively combined with clutches 6Ⅲ, 6Ⅳ and 6Ⅴ to realize six-speed shifting. Clutches 6Ⅰ and 6Ⅱ control the direction of the output shaft 7, and clutches 6Ⅲ, 6Ⅳ and 6Ⅴ realize three-speed shifting.

[0033] When clutch 6Ⅰ is connected, output shaft 7 does not output speed. Clutch 6Ⅰ and any one of clutches 6Ⅲ, 6Ⅳ, and 6Ⅴ need to be connected. Output shaft 7 outputs speed in the opposite direction of input shaft 1. Clutches 6Ⅰ and 6Ⅲ are connected, and the third-stage ring gear 4b is connected to the first-stage ring gear 2b and the second-stage planet carrier. The third-stage planetary gear 4c cannot rotate between the third-stage ring gear 4b and the third-stage sun gear 4a, which is equivalent to the role of the spline. Then the third-stage ring gear 4b, the third-stage planetary gear 4c, the third-stage sun gear 4a and the output shaft rotate synchronously. At this time, the power transmission route is: input shaft 1→first-stage sun gear 2a→first-stage planetary gear 2c→first-stage ring gear 2b→third-stage sun gear 4a, third-stage ring gear 4b→third-stage planet carrier, that is, output shaft 7. This transmission route has the highest output speed. The clutches 6Ⅰ and 6Ⅴ are connected from the input shaft 1→the first-stage sun gear 2a→the first-stage planetary gear 2c→the first-stage ring gear 2b→the third-stage sun gear 4a→the third-stage planetary gear 4c→the third-stage planetary carrier, i.e., the output shaft 7. This transmission route has the second highest output speed. The clutches 6Ⅰ and 6Ⅳ have a power transmission route: the input shaft 1→the first-stage sun gear 2a→the first-stage planetary gear 2c→the first-stage ring gear 2b→the third-stage sun gear 4a→the third-stage planetary gear 4c→the third-stage planetary carrier, i.e., the output shaft 7. This transmission route has the lowest output speed. In order to facilitate the description of the technical solution, “→” here represents the direction of power output, and the two components before and after “→” can be directly connected or connected through other components.

[0034] When clutch 6Ⅱ is connected, output shaft 7 does not output speed. Clutch 6Ⅱ and any one of clutches 6Ⅲ, 6Ⅳ, and 6Ⅴ need to be connected. Output shaft 7 outputs speed in the same direction as input shaft 1. Clutches 6Ⅱ and 6Ⅲ are connected, and the third-stage ring gear 4b is connected with the first-stage ring gear 2b and the second-stage planet carrier. The third-stage planetary gear 4c cannot rotate between the third-stage ring gear 4b and the third-stage sun gear 4a, which is equivalent to the role of the spline, so the third-stage ring gear 4b, the third-stage planetary gear 4c, the third-stage sun gear 4a and the output shaft rotate synchronously. At this time, the power transmission route is: input shaft 1→secondary sun gear 3a→secondary planetary gear 3c→primary ring gear 2b, secondary planetary carrier→tertiary sun gear 4a, tertiary ring gear 4b→tertiary planetary carrier, that is, output shaft 7. This transmission route has the highest output speed; connecting clutches 6Ⅱ and 6Ⅴ, from input shaft 1→secondary sun gear 3a→secondary planetary gear 3c→primary ring gear 2b→tertiary sun gear 4a→tertiary planetary carrier 4c→tertiary planetary carrier, that is, output shaft 7. This transmission route has the second highest output speed; connecting clutches 6Ⅱ and 6Ⅳ, power transmission route: input shaft 1→secondary sun gear 3a→secondary planetary gear 3c→primary ring gear 2b→tertiary sun gear 4a→tertiary planetary gear 4c→tertiary planetary carrier, that is, output shaft 7. This transmission route has the lowest output speed.

[0035] Compared with the traditional gearbox that shifts gears through a shift fork, a coupling, and a sliding gear, the three-row six-speed planetary gearbox has a compact structure, a wide transmission ratio range, and a large transmission torque. Compared with the existing advanced bulldozer power transmission system gearbox, the present invention reduces a first-stage sun gear through NW-type planetary transmission, simplifies the structure, and reduces the overall weight of the gearbox.

[0036] Compared with the Chinese patent CN106884936B involved in the background technology, a three-planetary-row six-speed automatic transmission is disclosed. The three-planetary-row six-speed automatic transmission has 6 forward gears and 1 reverse gear, while the three-row six-speed planetary transmission of the present application has 3 forward gears and 3 reverse gears; the three-planetary-row six-speed automatic transmission has 3 torque transmission components and 2 brake components, while the present application has 1 torque transmission component and 4 brake components; and the three-planetary-row six-speed automatic transmission is mainly aimed at automobiles, and can cope with complex driving conditions. It has 6 forward gear speeds available for switching, and retains 1 reverse gear; while the three-row six-speed planetary transmission of the present application is mainly aimed at engineering machinery operating conditions, providing 3 forward gears and 3 reverse gears.

[0037] The present application also provides a power device, which includes a drive device and a three-row six-speed planetary gearbox of the present application connected to the drive device, wherein the drive device includes an engine and an electric motor.

[0038] All articles and references disclosed, including patent applications and publications, are incorporated herein by reference for all purposes. The term "consisting essentially of..." to describe a combination should include the identified elements, ingredients, parts or steps and other elements, ingredients, parts or steps that do not substantially affect the basic novel characteristics of the combination. The use of the terms "comprising" or "including" to describe a combination of elements, ingredients, parts or steps herein also contemplates embodiments that consist essentially of these elements, ingredients, parts or steps. By using the term "may", it is intended to indicate that any attribute described that "may" include is optional.

[0039] Multiple elements, ingredients, parts or steps can be provided by a single integrated element, ingredient, part or step. Alternatively, a single integrated element, ingredient, part or step can be divided into separate multiple elements, ingredients, parts or steps. The disclosure "one" or "an" used to describe an element, ingredient, part or step is not intended to exclude other elements, ingredients, parts or steps.

[0040] It should be understood that the above description is for illustration and not for limitation. Many embodiments and many applications beyond the examples provided will be apparent to those skilled in the art upon reading the above description. Therefore, the scope of the present teachings should not be determined with reference to the above description, but should be determined with reference to the appended claims and the full scope of equivalents possessed by such claims. For the purpose of comprehensiveness, all articles and references, including disclosures of patent applications and publications, are incorporated herein by reference. The omission of any aspect of the subject matter disclosed herein in the preceding claims is not intended to be a waiver of the subject matter, nor should it be considered that the inventors did not consider the subject matter to be part of the disclosed inventive subject matter.

Claims

1. A three-row six-speed planetary gearbox, characterized in that: The three-row six-speed planetary gearbox includes: an input shaft, an output shaft, a planetary gear train, a first clutch, a second clutch and a third clutch; The planetary gear train includes a primary planetary gear train, a secondary planetary gear train and a tertiary planetary gear train, which are sequentially connected in transmission. The first-stage planetary gear train includes a first-stage sun gear, a first-stage planetary gear and a first-stage ring gear; the second-stage planetary gear train includes a second-stage sun gear, a second-stage planetary gear and a second-stage ring gear; the third-stage planetary gear train includes a third-stage sun gear, a third-stage planetary gear and a third-stage ring gear, the third-stage sun gear is connected to the first-stage ring gear, the third-stage ring gear is connected to the first-stage ring gear through the third clutch, and the third-stage planetary gear is connected to the output shaft. Among them, the first-stage sun gear is transmission-connected to the input shaft, the first-stage planetary gear is arranged on the first-stage planetary carrier, the first-stage planetary carrier is connected to the first clutch, the second-stage sun gear is connected to the input shaft, the second-stage planetary gear is arranged on the first-stage ring gear, and the second-stage ring gear is connected to the second clutch.

2. The three-row six-speed planetary gearbox according to claim 1, characterized in that: The three-stage planetary gear train adopts NW type transmission.

3. A power device, characterized in that: The power device includes a driving device and a three-row six-speed planetary transmission as described in claim 1 or 2 connected to the driving device, wherein the driving device includes an engine and an electric motor.

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