CN201071904Y - Differential planetary gearbox - Google Patents

Abstract

The utility model discloses a differential planetary gear box, which comprises a box body (15), the input end of the box body (15) is set with a first-stage planetary transmission mechanism, and the output end of the box body (15) is provided with intermeshing The large and small parallel gears (13, 14) are characterized in that: a two-stage planetary transmission mechanism and a three-stage planetary transmission mechanism are arranged between the first sun gear (2) and the large parallel gear (13). The remarkable effects of the utility model are: reducing the transmission torque of each transmission mechanism, reducing the volume and weight of the transmission mechanism, and reducing the weight of the entire gear box. Compared with conventional wind power speed-up gearboxes, its unit power weight is reduced by more than 20%.

Description

Differential planetary gearbox

technical field

The utility model belongs to a gear box transmission device, in particular to a differential planetary gear box which adopts planetary gear transmission to transmit power.

Background technique

With the development of industry now, the volume and weight of many machines and equipment have increased. In many workplaces, large-scale heavy equipment must be installed and lifted, and the lifting capacity of the equipment crane used for installation is very limited. For example, in the wind power generator industry, with the rapid development of the wind power generation industry, the single-unit power of the wind power speed-up gearbox is increasing, and the volume and weight naturally increase accordingly. It is very expensive to transport this large and heavy equipment to remote wind farms with inconvenient transportation, and then hoist it to a tower with a height of 80-100 meters for installation. For this reason, in order to relatively reduce these costs, various gearbox manufacturers in the world try their best to reduce the power weight of the gearbox unit under the condition of constant service life. At present, as the main equipment for power transmission in wind power generation systems, the gearbox structure of planetary gear transmission is generally adopted, and most of them are one-stage planetary gear plus two-stage parallel shaft transmission structure. As shown in Figure 1, the main structure includes a box , the input end of the gearbox is connected with the planetary carrier as power input. The planetary carrier is installed in the box and is equipped with three planetary gears. The ring gear of the planetary transmission is assembled together as a part of the box, and the sun gear is used as a Rotational speed and torque output, through the spline connection and parallel and gear pairs for torque output, the output gear of the gearbox transmits power and output rotational speed through gear meshing.

Its disadvantages are: the torque transmission components of each transmission mechanism in the gearbox are all running at full load, bearing 100% load, as the load increases, the transmission torque increases correspondingly, and the volume and weight of each transmission mechanism increase significantly. The overall weight of the gear box is also increased, which increases the difficulty of field installation and maintenance operations.

Utility model content

The purpose of this utility model is to provide a differential planetary gearbox, which can share the load of each transmission mechanism in the gearbox, and reduce the transmission torque of each transmission mechanism under the same load, and reduce the transmission torque of the transmission mechanism. Volume and weight, reducing the weight of the entire gearbox.

In order to achieve the above purpose, a differential planetary gearbox described in the utility model includes a box body, and the input end of the box body is provided with a bearing to support the first planet carrier, and the first planet carrier and the input outside the box body The shaft is fixedly connected, the main bracket of the first planet carrier is located in the box, and the main bracket is equipped with a first-level planetary transmission mechanism, which is composed of three first-level planetary gears, a first sun gear and a first ring gear , the main shafts of the three first-stage planetary gears are sleeved on the main bracket, and the tooth surfaces of the first-stage planetary gears are meshed between the first inner ring gear and the first sun gear, wherein the first inner ring gear is fixed On the box body, the first sun gear transmits rotational kinetic energy to the output end of the box body; large and small parallel gears meshing with each other are arranged at the output end of the box body, wherein the large parallel gear receives the rotational kinetic energy transmitted from the input end, The main shaft of the small parallel gear protrudes from the box, and the main shaft of the small parallel gear is supported on the box by bearings. transmission mechanism;

The input shaft is integrated with the first planet carrier, and the first planet carrier rotates as a power input member; the first sun gear serves as a power output.

The structure of the two-stage planetary transmission mechanism is as follows: the main bracket is fixed with a second ring gear, and the second ring gear is meshed with three second-stage planetary gears, and the planetary gear shafts of the three second-stage planetary gears are connected to the The casing is fixedly connected, and the two-stage planetary gears are jointly meshed on the outer tooth surface of the second sun gear, and the main shaft of the first sun gear extends and passes through the central through hole of the second sun gear;

The two-stage planetary transmission mechanism is a planetary transmission with a fixed planetary frame: the second inner ring gear is used as power input and fixed with the first planetary frame; when the torque is input through the input shaft outside the box and rotates, the main bracket and the second The ring gear also rotates synchronously, so there are two input members --- the main bracket and the second ring gear, to input the power, and the power is divided here. The three second-stage planetary gears are set on the box body through the planetary gear shaft, and the box body is fixed as the planet carrier of the second-stage planetary transmission mechanism, so that the three second-stage planetary gears only rotate without revolution, which is equivalent to the idler gear; the second inner When the ring gear rotates, the meshing three secondary planetary gears rotate on their own, thereby meshing with the second sun gear to rotate. In the second stage transmission, the second ring gear is the power input member, and the second sun gear is the output.

The structure of the three-stage planetary transmission mechanism is: the second sun gear extends toward the output end and bends outward, and is fixed with a third inner ring gear, and the third inner ring gear is meshed with three third-stage planetary gears, The planetary shaft of the three-stage planetary gear is installed on the third planetary carrier, and the third planetary carrier is fixedly connected with the main shaft extension end of the first sun gear, and the three-stage planetary gears are jointly meshed on the outer surface of the third sun gear. On the tooth surface, the main shaft extension tube of the third sun gear is keyed to the large parallel gear.

The three-stage planetary transmission mechanism is a differential mechanism: the third internal ring gear and the second sun gear are fixed together, the second sun gear rotates, and the third internal ring gear rotates synchronously with it. In this stage of transmission, the third internal ring gear The ring gear is a power input member. The third planet carrier of the three-stage planetary gear and the first sun gear are splined together to form the planet carrier of the third-stage planetary transmission, and the power transmitted by the first sun gear passes through the third planet carrier of the three-stage planetary gear For transmission, the two rotate synchronously. In this stage, both the third inner ring gear and the third planetary carrier are input as active parts. After the power input is shunted through the main bracket and the second inner ring gear at the first stage, it passes through the third inner ring gear at this stage. The ring gear and the third planet carrier perform power combining. The inner ring gear meshes with the third-stage planetary gear, the third-stage planetary wheel rotates on its own, the planet carrier of the third-stage planetary transmission drives the third-stage planetary gear to revolve, and the third-stage planetary gear meshes with the sun gear to rotate. In the three-stage planetary transmission mechanism, the third ring gear and the planet carrier are used as power input, and the two parts turn differently, the relative speed increases, and the power is output from the third sun gear. Since both the third inner ring gear and the planetary carrier serve as power input, and they rotate in different directions, it is a differential planetary transmission. The power of the third inner ring gear and the planet carrier is combined to improve the transmission efficiency.

The first-stage planetary transmission mechanism transmits about 60%-70% of the load, the second-stage planetary transmission mechanism transmits about 30%-40% of the load, mainly to increase the speed, and the third-stage planetary transmission mechanism is a differential planetary transmission, mainly to transfer The kinetic energy is combined and then transmitted for output, which improves the transmission power of the gearbox.

The main bracket of the first planet carrier is screwed to the second inner ring gear.

The first sun gear is connected to the third planet carrier through splines.

The third inner ring gear is screwed to the extension end of the second sun gear.

The output end is driven by a closed fixed shaft gear, and the speed ratio of the large and small parallel gears can reach the output speed required by the user.

The outer ring of the extension part of the second sun gear towards the output end is fitted with a bearing and connected with the casing.

The planetary transmission mechanism realizes kinetic energy transmission through the floating connection between the sun gear and the planetary gear, and the installation of bearings can limit the position of the planetary transmission mechanism to ensure the stable operation of the gearbox.

The remarkable effect of the utility model is: since the first-stage planetary transmission mechanism only transmits 60-70% of the entire rated power, and the second-stage planetary transmission mechanism transmits 40-30% of the rated power, the transmission of each transmission in the gear box The load of the mechanism is shared; the gear of the third-stage planetary transmission mechanism is a differential gear train, and the relative speed increases more. The speed ratio of the first two stages does not need to be too large. Under the same load, the power is divided , and finally forms a closed transmission form at the output end, which has a relatively high power transfer efficiency. The transmission torque of each transmission mechanism is reduced, the volume and weight of the transmission mechanism are reduced, and the weight of the entire gear box is reduced. Compared with conventional wind power speed-up gearboxes, its unit power weight is reduced by more than 20%.

Description of drawings

Fig. 1 is the structural representation of existing planetary gear transmission gearbox;

Fig. 2 is the structural representation of the utility model;

Fig. 3 is a structural schematic diagram of the first-stage planetary transmission mechanism;

Fig. 4 is a structural schematic diagram of the second-stage planetary transmission mechanism;

Fig. 5 is a structural schematic diagram of a third-stage planetary transmission mechanism;

Detailed ways

Below in conjunction with accompanying drawing and specific embodiment the utility model is described in further detail.

As shown in Figures 2 and 3: a differential planetary gearbox, including a box body 15, the input end of the box body 15 is provided with a bearing a to support the first planet carrier 1, the first planet carrier 1 and the box body 15 The outer input shaft is fixedly connected, the main bracket 1a of the first planet carrier 1 is located in the box body 15, and the main bracket 1a is equipped with a first-level planetary transmission mechanism, which is composed of three first-level planetary gears 3, one first The sun gear 2 and the first ring gear 4 are composed, the main shafts of the three first-stage planetary gears 3 are fitted on the main bracket 1a, and the tooth surfaces of the first-stage planetary gears 3 mesh with the first ring gear 4 Between the first sun gear 2, where the first ring gear 4 is fixed on the box body 15, the first sun gear 2 transmits rotational kinetic energy to the output end of the box body 15; Engaging large and small parallel gears 13 and 14, wherein the large parallel gear 13 receives the rotational kinetic energy transmitted from the input end, the main shaft of the small parallel gear 14 extends out of the box body 15, and the main shaft of the small parallel gear 14 is supported on the box body 15 through bearings , wherein: a two-stage planetary transmission mechanism and a three-stage planetary transmission mechanism are arranged between the first sun gear 2 and the large parallel gear 13;

As shown in Figures 2 and 4: the structure of the two-stage planetary transmission mechanism is: a second ring gear 6 is fixed on the main bracket 1a, and three second-stage planetary gears 7 are meshed in the second ring gear 6, The planetary shafts 5 of the three secondary planetary gears 7 are fixedly connected to the casing 15, the secondary planetary gears 7 are co-meshed on the outer tooth surface of the second sun gear 8, the main shaft of the first sun gear 2 extends and passing through the central through hole of the second sun gear 8;

As shown in Figures 2 and 5: the structure of the three-stage planetary transmission mechanism is: the second sun gear 8 extends toward the output end and bends outward, and is fixed with a third inner ring gear 11, the third inner gear There are three three-stage planetary gears 10 meshed in the ring 11, and the planet shafts of the three-stage planetary gears 10 are installed on the third planet carrier 9, which is connected to the main shaft extension end of the first sun gear 2 on the third planet carrier 9. Fixedly connected, the three-stage planetary gear 10 is co-meshed on the outer tooth surface of the third sun gear 12 , and the main shaft extension tube of the third sun gear 12 is keyed to the large parallel gear 13 .

The first-stage planetary transmission mechanism transmits about 60%-70% of the load, the second-stage planetary transmission mechanism transmits about 30%-40% of the load, mainly to increase the speed, and the third-stage planetary transmission mechanism is a differential planetary transmission, mainly to transfer The kinetic energy is combined and then transmitted for output, which improves the transmission power of the gearbox.

The output end is driven by a closed fixed shaft gear, and the speed ratio of the large and small parallel gears 13 and 14 can reach the output speed required by the user.

The main bracket 1a of the first planet carrier 1 is screwed to the second ring gear 6 .

The first sun gear 2 is connected to the third planet carrier 9 through splines.

The third ring gear 11 is screwed to the extension end of the second sun gear 8 .

The outer ring of the extension of the second sun gear 8 to the output end is fitted with a bearing b and connected to the case 15 .

It works as follows:

As shown in Figures 2, 3, 4, and 5: when the external force drives the first planet carrier 1 to rotate clockwise, it drives the three first-stage planetary gears 3 of the first-stage planetary transmission mechanism to revolve clockwise around the first sun gear 2. The planetary gear 3 rotates counterclockwise, driving the first sun gear 2 to rotate clockwise; at the same time, the second inner ring gear 6 fixed on the main bracket 1a of the first planet carrier 1 rotates clockwise, and the three gears of the two-stage planetary transmission mechanism The second-stage planetary gear 7 rotates clockwise and drives the second sun gear 8 to rotate counterclockwise; in the three-stage planetary transmission mechanism, the second sun gear 8 drives the third ring gear 11 to rotate counterclockwise, and the first sun gear 2 Three three-stage planetary gears 10 revolve clockwise, and two differential planetary transmissions in opposite directions increase the rotation speed of the third sun gear 12, increase the rotation speed of the large parallel gear 13 and the small parallel gear 14, and increase the transmission load of the gearbox s efficiency.

Claims (4)

1. A differential planetary gearbox, comprising a casing (15), the input end of the casing (15) is provided with a bearing (a) to support the first planet carrier (1), the first planet carrier (1) It is fixedly connected with the input shaft outside the box body (15), the main bracket (1a) of the first planet carrier (1) is located in the box body (15), and the main bracket (1a) is equipped with a first-stage planetary transmission mechanism, and the first-stage planetary The transmission mechanism is composed of three primary planetary gears (3), a first sun gear (2) and a first ring gear (4). The main shafts of the three primary planetary gears (3) are sleeved on the main On the bracket (1a), the tooth surface of the primary planetary gear (3) is meshed between the first ring gear (4) and the first sun gear (2), wherein the first ring gear (4) is fixed on On the box body (15), the first sun gear (2) transmits rotational kinetic energy to the output end of the box body (15); the output end of the box body (15) is provided with large and small parallel gears (13, 14), wherein the large parallel gear (13) receives the rotational kinetic energy transmitted from the input end, the main shaft of the small parallel gear (14) protrudes from the casing (15), and the main shaft of the small parallel gear (14) is supported on the casing ( 15), characterized in that: a two-stage planetary transmission mechanism and a three-stage planetary transmission mechanism are arranged between the first sun gear (2) and the large parallel gear (13); Wherein the structure of the two-stage planetary transmission mechanism is: a second internal ring gear (6) is fixed on the main support (1a), and three secondary planetary gears (7) are meshed in the second internal ring gear (6), The planetary gear shafts (5) of the three secondary planetary gears (7) are fixedly connected to the casing (15), and the secondary planetary gears (7) are jointly meshed on the outer tooth surface of the second sun gear (8), so The main shaft of the first sun gear (2) extends and passes through the central through hole of the second sun gear (8); The structure of the three-stage planetary transmission mechanism is: the second sun gear (8) extends toward the output end and bends outwards, and is fixed with a third inner ring gear (11), the third inner ring gear (11) Three three-stage planetary gears (10) are internally meshed, and the planet shafts of the three-stage planetary wheels (10) are installed on the third planetary carrier (9), which is connected to the first sun on the third planetary carrier (9). The extension end of the main shaft of the wheel (2) is fixedly connected, and the three-stage planetary gear (10) is engaged with the outer tooth surface of the third sun gear (12), and the main shaft extension tube of the third sun gear (12) is connected to the large Parallel gear (13) key connection. 2. The differential planetary gearbox according to claim 1, characterized in that: the main bracket (1a) of the first planetary carrier (1) is screwed to the second inner ring gear (6). 3. The differential planetary gearbox according to claim 1, characterized in that: the first sun gear (2) is connected to the third planetary carrier (9) through a spline. 4. The differential planetary gearbox according to claim 1, characterized in that: the third inner ring gear (11) is screwed to the extension end of the second sun gear (8).

Images