Planetary structure for caterpillar tractor gearbox
By designing the output shaft to be controlled by the planetary carrier, and the internal gear ring and sun gear set to jointly regulate the speed, the speed is reduced by using the gear ratio between the coaxial drive wheel and the sun gear, thus solving the problem of the small speed adjustment range of the traditional planetary structure, and realizing the reduction of gearbox size and the improvement of structural strength.
Patent Information
- Application Number
- CN202520121904.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-20
- Publication Date
- 2025-12-12
- Estimated Expiration
- 2035-01-20
AI Technical Summary
In traditional planetary gear systems, the output shaft is connected to the sun gear, resulting in a small speed adjustment range and the need for multi-stage gear sets for reduction. This leads to a large gearbox size, making it unsuitable for installation on small and medium-sized tracked tractors.
The output shaft is designed to be controlled by a planetary carrier. The internal gear ring and the sun gear set together affect the speed regulation of the planetary gear set. The gear ratio between the coaxial drive wheel and the sun gear is used to reduce the speed, eliminating the multi-stage gear set and directly transmitting the steering power pump output.
The speed range of the planetary structure was improved, the size of the gearbox was reduced, the structural strength of the output shaft was enhanced, and the overall size of the gearbox was reduced.
Smart Images
Figure CN223662473U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the technical field of tracked tractor equipment, specifically to a planetary structure for a gearbox of a 30-80 horsepower tracked tractor. Background Technology
[0002] Planetary gearboxes are a common transmission structure in tracked tractor gearboxes. They can transfer kinetic energy from the engine to the wheels. By controlling the relative positions of the planetary gears and the sun gear, the vehicle speed can be changed. In traditional planetary gearboxes, the output shaft is often connected to the sun gear, resulting in a small speed adjustment range. Therefore, when the tractor turns, the speed output by the steering power pump needs to be reduced by multiple stages (3-5 stages) of gear sets before it can be transmitted to the planetary gearbox. The use of multiple stages of gear sets greatly increases the size of the gearbox, making it inconvenient to install the gearbox in small and medium-sized tracked tractors. Utility Model Content
[0003] To address the problems existing in the prior art, this utility model provides a planetary structure for a tracked tractor gearbox. The output shaft speed is controlled by the planet carrier and, influenced by the internal gear ring and the sun gear set, can effectively improve the speed range of the planetary gear set. The coaxial design of the drive wheel and the sun gear, through the gear ratio between the drive wheel and the sun gear, can effectively reduce the speed of the sun gear. This allows the speed output by the steering power pump to be directly transmitted to the planetary structure, avoiding the use of gear sets in the gearbox and helping to reduce the size of the gearbox.
[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows:
[0005] A planetary gearbox for a tracked tractor includes an output shaft, a sun gear set mounted on the outer side of the output shaft, a planet carrier on the outer side of the sun gear set, a plurality of evenly distributed planet gears meshing with the sun gear set rotatably mounted on the planet carrier, internal gear rings meshing with the outer side of the planet gears, and an internal gear ring extending from one end of the output shaft and meshing with the sun gear set, the internal gear ring being fixedly mounted on the planet carrier.
[0006] Preferably, the sun gear assembly includes a hollow connecting shaft, with a drive wheel and a sun gear respectively at both ends of the connecting shaft, and the output shaft is inserted into the connecting shaft.
[0007] Preferably, the radius of the drive wheel is larger than the radius of the sun wheel.
[0008] Preferably, the diameter of the sun gear is greater than 1 / 2 of the inner diameter of the external gear ring.
[0009] Preferably, the connecting shaft and the output shaft are configured as a rotatable connection.
[0010] The beneficial effects of this utility model are as follows:
[0011] 1. The coaxial drive wheel and sun wheel design in this utility model utilizes the drive wheel to drive the rotation of the sun wheel. The gear ratio between the drive wheel and the sun wheel can effectively reduce the speed of the sun wheel, which can decelerate when the drive speed enters the planetary structure, thus improving the deceleration effect of the planetary structure.
[0012] 2. In this utility model, the speed of the output shaft is controlled by the planetary carrier and is affected by both the internal gear ring and the sun gear set, which can effectively improve the speed regulation range of the planetary gear set;
[0013] 3. The design of the sun gear having a diameter greater than 1 / 2 of the inner diameter of the outer gear ring in this utility model can reduce the diameter of the planet gears while keeping the diameter of the outer gear ring unchanged, thereby further improving the deceleration effect of the planetary structure. It can also reserve sufficient space on the connecting shaft for the output shaft, making it easier to increase the diameter of the output shaft and ensuring the structural strength of the output shaft. Attached Figure Description
[0014] Figure 1 This is a cross-sectional view of a planetary structure for a tractor gearbox according to the present invention.
[0015] In the diagram: 1-output shaft, 2-planet carrier, 3-planet gear, 4-internal gear ring, 5-internal gear ring, 6-connecting shaft, 7-drive wheel, 8-sun gear. Detailed Implementation
[0016] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to the accompanying drawings.
[0017] like Figure 1 The diagram illustrates a planetary gearbox for a tractor, comprising an output shaft 1, a sun gear set mounted on the outer side of the output shaft 1, a planet carrier 2 on the outer side of the sun gear set, and a plurality of evenly distributed planet gears 3 rotatably mounted on the planet carrier 2, meshing with the sun gear set. An internal gear ring 4 meshes with the outer side of each planet gear 3, and a drive bevel gear is fixedly mounted on the outer side of the internal gear ring 4. One end of the output shaft 1 extends out from the sun gear set and meshes with an internal gear ring 5, which is fixedly mounted on the planet carrier 2. The rotational speed of the output shaft 1 is controlled by the planet carrier 2, and the combined influence of the internal gear ring 4 and the sun gear set effectively improves the speed range of the planet gear set 3.
[0018] The sun gear assembly includes a hollow connecting shaft 6, with a drive wheel 7 and a sun gear 8 at each end of the connecting shaft 6. The radius of the drive wheel 7 is larger than the radius of the sun gear 8. The output shaft 1 is inserted into the connecting shaft 6. The coaxial design of the drive wheel 7 and the sun gear 8 allows the drive wheel 7 to drive the rotation of the sun gear 8. The gear ratio between the drive wheel 7 and the sun gear 8 can effectively reduce the speed of the sun gear 8, which can decelerate when the driving speed enters the planetary structure, thus improving the deceleration effect of the planetary structure.
[0019] The diameter of the sun gear 8 is greater than 1 / 2 of the inner diameter of the outer gear ring. This allows for a reduction in the diameter of the planet gear 3 while keeping the outer gear ring diameter constant, thereby improving the deceleration effect of the planetary structure. It also allows for sufficient space to be reserved on the connecting shaft 6 for the output shaft 1, making it easier to increase the diameter of the output shaft 1 and ensuring the structural strength of the output shaft 1.
[0020] The connecting shaft 6 and the output shaft 1 are rotatably connected. The end of the connecting shaft 6 away from the sun gear 8 is provided with a mounting groove. A bushing is provided in the mounting groove. A track groove is provided in the bushing. Several freely movable balls are installed in the track groove. The output shaft 1 is inserted into the bushing. The balls abut against the output shaft 1. The design of the bushing and the mounting groove can effectively reduce the space required for the rotatable connection between the connecting shaft 6 and the output shaft 1.
[0021] The above description is merely an example and illustration of the structure of this utility model. Those skilled in the art can make various modifications or additions to the specific embodiments described or use similar methods to replace them, as long as they do not deviate from the structure of the utility model or exceed the scope defined in the claims, they should all fall within the protection scope of this utility model.
Claims
1. A planetary structure for a track-type tractor transmission, characterized by, The output shaft is externally sleeved with a sun gear set, the sun gear set is externally provided with a planet carrier, a plurality of uniformly distributed planet gears which are in meshing connection with the sun gear set are rotatably installed on the planet carrier, the planet gears are in meshing connection with an inner ring gear on the outside, one end of the output shaft extends out of the sun gear set and is in meshing connection with an inner ring, and the inner ring is fixedly installed on the planet carrier.
2. A planetary structure for a track-type tractor transmission according to claim 1, characterized in that, The sun gear set comprises a hollow designed connecting shaft, the connecting shaft is provided with a driving wheel and a sun gear at both ends respectively, and the output shaft is inserted into the connecting shaft.
3. A planetary structure for a track-type tractor transmission according to claim 2, characterized in that, The radius of the driving wheel is greater than the radius of the sun gear.
4. A planetary structure for a track-type tractor transmission according to claim 2, wherein The connecting shaft and the output shaft are in rotational connection.
5. A planetary structure for a track-type tractor transmission according to claim 4, wherein One end of the connecting shaft away from the sun gear is provided with a mounting groove, the mounting groove is provided with a shaft sleeve, the shaft sleeve is provided with a track groove, a plurality of freely movable balls are installed in the track groove, the output shaft is inserted into the shaft sleeve, and the balls abut against the output shaft.