Compound planetary gearbox

Abstract

The utility model provides a kind of compound planetary gear box belongs to gear box technical field.The compound planetary gear box, including gear box, planet carrier, sun gear shaft and wheel system;Gear box front side is equipped with T type box front cover, rear end is equipped with box rear cover;Front cover tail end installs front cover inner gear ring, rear cover front side installs rear cover inner gear ring, the inner diameter of two inner gear rings is different and is positioned axially by ball cooperation through V type groove;Planet carrier is formed by bolt connection by front frame body and rear cover plate, and interval column forms overhead space;Sun gear of center gear shaft is engaged with compound planetary gear, and compound planetary gear is integrated by small diameter first gear and large diameter second gear through connecting pin, is engaged with front, rear cover inner gear ring respectively, and forms differential transmission;Box front and rear cover are equipped with sector heat dissipation window and promote heat dissipation efficiency.The utility model has the advantages of simplifying assembly process, enhancing operation stability, realizing efficient differential output.

Description

Technical Field

[0001] This utility model belongs to the field of gearbox technology, and specifically relates to a composite planetary gearbox. Background Technology

[0002] Planetary gearboxes, also known as planetary reducers, are transmission devices based on planetary gear train structures. They achieve reduced transmission ratios and amplified torque through the meshing of the sun gear, planet gears, and internal ring gear, and are widely used in industrial machinery, automotive manufacturing, and automation equipment. Current mainstream technologies include two-stage planetary transmissions, differential flow dividers, and NW planetary composite structures. However, as equipment develops towards higher power, higher speeds, and miniaturization, existing planetary gearbox technologies are gradually revealing problems in balancing axial dimensions and load-bearing capacity, differential stability, structural simplification, and weight reduction. Under complex operating conditions, single-structure planetary gearboxes often struggle to meet the demands for high efficiency, stability, and multi-functionality. Utility Model Content

[0003] The purpose of this invention is to address the aforementioned problems in the existing technology by providing a composite planetary gearbox.

[0004] The objective of this utility model can be achieved through the following technical solution: a composite planetary gearbox, comprising a gearbox body, a planet carrier, a central gear shaft and its upper gear train; The gearbox housing provides outer shell support for the entire structure, including a front cover on its front side and a rear cover on its inner rear side; the axial section of the front cover is T-shaped, allowing it to be snapped onto the front side of the gearbox housing via a flange, and a front axle sleeve is formed by the front cover extending forward from its center, with an inner gear ring fitted at the tail end of the T-shaped structure; the rear cover is fitted onto the inner rear end of the gearbox housing, with a rear axle end formed by its center extending backward, and an inner gear ring fitted at its front side; The front cover inner gear ring and the rear cover inner gear ring are coaxially installed in the gearbox body, and the inner diameter of the front cover inner gear ring is smaller than the inner diameter of the rear cover inner gear ring. The front cover inner gear ring and the rear cover inner gear ring are provided with several V-shaped grooves circumferentially opposite each other on their opposite surfaces, and ball bearings are embedded in the paired V-shaped grooves. The planetary carrier is composed of a front carrier body and a rear cover plate connected by bolts. The front carrier body has several spacer columns formed circumferentially on its rear side, which abut against the rear cover plate to form an overhead space. The central gear shaft, as the power input shaft, passes through the center of the planetary carrier. The central gear shaft is integrated with the inner gear ring of the front cover to form a sun gear inside the planetary carrier, and several compound planet gears are arranged around the sun gear and cooperate with it. The compound planet gears are arranged between the spacer columns of the planetary carrier. The compound planet gear is composed of a first gear, a second gear, and a connecting pin connecting the two at the center. The first gear meshes with the inner gear ring of the front cover, and the second gear meshes with the inner gear ring of the rear cover. The outer diameter of the second gear is larger than that of the first gear.

[0005] In the aforementioned composite planetary gearbox, several fan-shaped heat dissipation windows are evenly distributed circumferentially around the front axle sleeve on the front cover of the gearbox and around the rear axle end on the rear cover of the gearbox.

[0006] In the aforementioned composite planetary gearbox, bolt through holes are provided through the front carrier and rear cover plates of the planetary carrier, as well as between them, inside the spacer column. Connecting bolts are inserted into the bolt through holes to fix the front carrier and rear cover plates together.

[0007] In the aforementioned composite planetary gearbox, the number of composite planetary gears surrounding the sun gear should be no less than two, and the number of spacers on the front carrier of the planet carrier should be the same as the number of composite planetary gears.

[0008] In the aforementioned composite planetary gearbox, the number of composite planetary gears is preferably three.

[0009] Compared with the prior art, the composite planetary gearbox provided by this utility model effectively eliminates axial movement and reduces friction loss by using a double internal gear ring + V-groove ball bearing design, ensuring the smooth and efficient operation of the planetary gearbox; by designing the planetary gears as a composite integral type, it can simplify assembly and enhance the rigidity of differential transmission. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the structure of this composite planetary gearbox; Figure 2 This is an exploded view of the structure of this composite planetary gearbox; Figure 3 This is a structural sectional view and a partial enlarged view of this composite planetary gearbox; In the above diagram, 100 is the gearbox housing; 110 is the front cover of the housing; 111 is the internal gear ring of the front cover; 112 is the front axle sleeve; 120 is the rear cover of the housing; 121 is the internal gear ring of the rear cover; 122 is the rear axle end; 130 is the V-groove; 131 is the ball bearing; 140 is the heat dissipation window; 200 is the planetary carrier; 210 is the front carrier body; 211 is the spacer post; 212 is the bolt through hole; 220 is the rear cover plate; 300 is the central gear shaft; 310 is the sun gear; 320 is the compound planetary gear; 321 is the first gear; 322 is the second gear; and 323 is the connecting pin. Detailed Implementation

[0011] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0012] like Figures 1 to 3 As shown, this composite planetary gearbox includes a gearbox body 100, a planet carrier 200, a central gear shaft 300 and its upper gear train. The gearbox body 100 provides the outer shell support for the entire structure, and the planet carrier 200 is the mounting base for the central gear shaft 300 and its upper gear train, ensuring its stable operation.

[0013] like Figures 2 to 3 As shown, the gearbox 100 includes a front cover 110 on its front side and a rear cover 120 on its inner rear end. The axial section of the front cover 110 is T-shaped, and its outer flange is engaged with the front port of the gearbox 100. The center of the front cover 110 extends forward to form a front axle sleeve 112, which is used to support the central gear shaft 300. The tail end of its T-shaped structure is press-fitted with the inner gear ring 111 of the front cover through an interference fit. The coaxiality error between the two is ≤0.05mm.

[0014] The rear cover 120 is fitted inside the rear end of the gearbox 100, and the rear shaft end 122 extends from the center to the rear as the output end. The internal gear ring 121 of the rear cover is installed on the front side of the rear cover 120 by interference fit to ensure that it is coaxial with the internal gear ring 111 of the front cover. The coaxiality error of the two internal gear rings is ≤0.1mm.

[0015] The inner diameter of the front cover inner gear ring 111 is smaller than that of the rear cover inner gear ring 121. Both the front cover inner gear ring 111 and the rear cover inner gear ring 121 have several circumferentially opposite V-grooves 130 on their opposing surfaces. A pair of balls 131 are embedded within these V-grooves 130, with the diameter of the balls 131 matching the included angle of the V-grooves 130. The included angle of the V-grooves 130 is between 60° and 100°, achieving bidirectional axial positioning and allowing for ±0.3mm thermal deformation compensation. This design of double internal gear rings + V-grooves 130 with balls 131 effectively eliminates axial movement between the double internal gear rings, reduces frictional losses caused by the differential ratio, and thus ensures smooth and efficient operation of the planetary gearbox.

[0016] The planetary carrier 200 is composed of a front carrier body 210 and a rear cover plate 220 connected by bolts. The front carrier body 210 has three spacer columns 211 evenly distributed around its circumference. Bolt through holes 212 are opened through the interior of the spacer columns 211. The rear cover plate 220 is fixed to the front carrier body 210 by high-strength bolts passing through the bolt through holes 212. The height of the spacer columns 211 matches the thickness of the rear cover plate 220, forming an equally divided overhead space.

[0017] A central gear shaft 300, serving as the power input shaft, passes through the center of the planetary carrier 200. Inside the planetary carrier 200, a sun gear 310 is integrally formed with the inner gear ring 111 of the front cover at the same radial direction. Several compound planetary gears 320 are arranged around the sun gear 310 and mesh with it. These compound planetary gears 320 are mounted in the overhead space of the planetary carrier 200 via bearings, between adjacent spacers 211, with a total of three sets. Each compound planetary gear 320 consists of a first gear 321, a second gear 322, and a connecting pin 323 at the center connecting the two, simplifying assembly and enhancing the rigidity of the differential transmission. The first gear 321 meshes with the inner gear ring 111 of the front cover, and the second gear 322 meshes with the inner gear ring 121 of the rear cover. The outer diameter of the second gear 322 is larger than that of the first gear 321.

[0018] To further explain, the front cover 110 of the gearbox surrounds the front axle sleeve 112, and the rear cover 120 surrounds the rear axle end 122. Each of these features has several circumferentially distributed fan-shaped heat dissipation windows 140. Airflow through the windows forms axial convection, thereby reducing the internal temperature of the planetary gearbox and achieving heat dissipation.

[0019] The working principle of this utility model is as follows: When the central gear shaft 300 is used as the power shaft input, the sun gear 310 drives the compound planet gear 320 to revolve. The first gear 321 meshes with the inner gear ring 111 of the front cover to form a first transmission ratio i1, and drives the second gear 322 to move synchronously. The second gear 322 meshes with the inner gear ring 121 of the rear cover to form a second transmission ratio i2. Since i1≠i2, a differential speed ratio Δi=|i1-i2| is formed between the inner gear ring 111 of the front cover and the inner gear ring 121 of the rear cover, and is transmitted to the output of the rear shaft end 122 to realize differential operation.

[0020] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

[0021] Although this document uses a variety of terms, the possibility of using other terms is not excluded. These terms are used merely for the convenience of describing and explaining the essence of this invention; interpreting them as any additional limitation would contradict the spirit of this invention.

Claims

1. A composite planetary gearbox, comprising a gearbox body (100), a planet carrier (200), a central gear shaft (300), and an upper gear train thereof; Its features are, The gearbox housing (100) provides shell support for the entire structure, including a front cover (110) on its front side and a rear cover (120) at its internal rear end; the axial section of the front cover (110) is T-shaped, allowing it to be snapped onto the front side of the gearbox housing (100) by a flange, and the front cover (110) extends forward at its center to form a front axle sleeve (112), and a front cover internal gear ring (111) is fitted at the tail end of the T-shaped structure; the rear cover (120) is fitted onto the internal rear end of the gearbox housing (100), and its center extends backward to form a rear axle end (122), and a rear cover internal gear ring (121) is fitted at its front side; The front cover inner gear ring (111) and the rear cover inner gear ring (121) are coaxially installed in the gearbox body (100), and the inner diameter of the gear ring of the front cover inner gear ring (111) is smaller than the inner diameter of the gear ring of the rear cover inner gear ring (121). The front cover inner gear ring (111) and the rear cover inner gear ring (121) are provided with several V-shaped grooves (130) circumferentially opposite each other on their opposite surfaces, and ball bearings (131) are embedded in the paired V-shaped grooves (130). The planetary carrier (200) is composed of a front carrier body (210) and a rear cover plate (220) connected by bolts. The front carrier body (210) has several spacer columns (211) formed in the rear circumferential direction, which abut against the rear cover plate (220) to form an overhead space. The central gear shaft (300) serves as the power input shaft and passes through the center of the planetary carrier (200). The central gear shaft (300) has an integral sun gear (310) formed in the same radial direction as the inner gear ring (111) of the front cover inside the planetary carrier (200), and a mating gear is formed around the sun gear (310). The assembly is provided with a plurality of composite planetary gears (320), which are disposed between the spacers (211) of the planet carrier (200). The composite planetary gears (320) are composed of a first gear (321), a second gear (322), and a connecting pin (323) connecting the two at the center. The first gear (321) meshes with the inner gear ring (111) of the front cover, and the second gear (322) meshes with the inner gear ring (121) of the rear cover. The outer diameter of the second gear (322) is larger than that of the first gear (321).

2. The composite planetary gearbox according to claim 1, characterized in that, The front cover (110) of the housing is surrounded by the front axle sleeve (112), and the rear cover (120) of the housing is surrounded by the rear axle end (122). Several fan-shaped heat dissipation windows (140) are evenly opened in the circumference.

3. The composite planetary gearbox according to claim 1, characterized in that, Bolt through holes (212) are provided on the front frame (210) and rear cover plate (220) of the planetary carrier (200) and between them in the spacer column (211). Connecting bolts are inserted in the bolt through holes (212) to fix the front frame (210) and rear cover plate (220) together.

4. A composite planetary gearbox according to claim 1, characterized in that, The number of composite planetary gears (320) surrounding the sun gear (310) should be no less than 2, and the number of spacers (211) on the front frame (210) of the planet carrier (200) should be the same as the number of composite planetary gears (320).

5. A composite planetary gearbox according to claim 4, characterized in that, The number of the composite planetary gears (320) is 3.

Images