Planetary gear

Abstract

The utility model relates to the technical field of mechanical transmission, and discloses a planetary gear which comprises a planetary carrier body, a plurality of sets of planetary pin shaft hole grooves are formed in the surface of the planetary carrier body, the number of the planetary pin shaft hole grooves is multiple, and the planetary pin shaft hole grooves are in an oval shape. A plurality of groups of planet pin shaft hole grooves are arranged around the center of the planet carrier main body in an annular array mode, planet pins are installed in the planet pin shaft hole grooves of the planet carrier main body, and the planet carrier is characterized in that the planet pin shaft hole grooves at the planet pin positions are designed to be oval, so that the types of blanks are saved, and the production cost is reduced. Compared with the prior art, the single planet carrier is adaptive to the planet speed reducer with various speed ratios, and meanwhile, if the planet carrier has special treatment requirements, the planet carrier can be independently subjected to special process treatment instead of independent mold opening, so that the material period is shortened, the planet speed reducer can better adapt to different working environments and requirements, and the use flexibility of equipment is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of mechanical transmission, in particular to a planetary gear. Background Art

[0002] As a precision transmission device, planetary reducer is widely used in various mechanical equipment and automated production lines. It is a gear transmission device that converts the high-speed rotation of the input shaft into the low-speed rotation of the output shaft through a planetary gear system, while transmitting torque. The planetary reducer transmission device is composed of planetary gears, including sun gears, planetary gears, planetary bearings, planetary pins, planetary carriers and inner ring gears. The speed ratio of the planetary reducer and the number of teeth of its sun gear and planetary gear can be calculated by a specific formula. The speed ratio of the planetary reducer can be expressed by the following formula: Speed ​​ratio = number of teeth of inner ring gear / number of teeth of sun gear + 1. On the premise of ensuring the same size of the outer diameter of the gear ring, the reduction ratio of the planetary reducer is inversely proportional to the number of teeth of the sun gear and directly proportional to the number of teeth of the planet gear. The larger the speed ratio, the more teeth the planet gear has and the larger the diameter of the planet gear. On the contrary, the smaller the speed ratio, the fewer teeth the planet gear has and the smaller the diameter of the planet gear. In order to facilitate the meshing of the planet gear, sun gear and gear ring, the larger the speed ratio, the smaller the center distance of the planet pins on the planet carrier where the planet gear is installed. The smaller the speed ratio, the larger the center distance of the planet pins on the planet carrier where the planet gear is installed.

[0003] At present, the change of the speed ratio of the planetary reducer will cause the center distance of the planetary pins on the planetary gear carrier to change. Different center distances require different molds for the planetary carrier, which increases the mold opening cost. Planetary carriers with different center distances of planetary pins increase the variety of materials, increase the difficulty and cost of management, so we proposed a planetary gear to solve the above problems. Summary of the invention

[0004] In view of the deficiencies in the prior art, the utility model provides a planetary gear which solves the problem that changes in the speed ratio of the current planetary reducer will cause changes in the center distance of the planetary pins on which the planetary wheels are mounted on the planetary wheel frame. Due to different center distances, the planetary frame needs to have different molds, which leads to increased mold making costs and increased management difficulty and cost.

[0005] To achieve the above purpose, the utility model is implemented through the following technical solutions: a planetary gear, including a planet carrier body, the surface of the planet carrier body is provided with a plurality of groups of planet pin shaft hole grooves, the number of the planet pin shaft hole grooves is multiple groups, the planet pin shaft hole grooves are elliptical in shape, and the plurality of groups of the planet pin shaft hole grooves are arranged in a ring array around the center of the planet carrier body, the planet pin shaft hole grooves of the planet carrier body are installed with planet pins, and the planet pins can be connected at any point of the center distance of the planet pin shaft hole grooves.

[0006] Preferably, a sun gear is further included, and the center of the planet carrier body is connected to the sun gear.

[0007] Preferably, a planetary wheel is also included, and the planetary wheel is connected to the planetary pin via a bearing.

[0008] Preferably, an inner gear ring is further included, which is arranged outside the planet carrier body and concentrically arranged with the planet carrier body.

[0009] Preferably, the planet pin is fixed to the planet carrier body via a fixing part.

[0010] Beneficial Effects

[0011] The utility model provides a planetary gear. Compared with the prior art, it has the following beneficial effects:

[0012] The planetary gear is designed to have an elliptical planetary pin shaft hole groove at the planetary pin position, thereby saving types of blanks. A single planetary carrier is suitable for planetary reducers with various speed ratios. At the same time, the planetary carrier has special processing requirements. The planetary carrier can be processed with a special process separately instead of opening a mold separately, which saves material cycles and reduces management difficulty and cost, so that the planetary reducer can better adapt to different working environments and needs, and improves the flexibility of equipment use. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is the main structure front view of the planet carrier of the utility model;

[0014] Figure 2 This is a cross-sectional view of the main structure of the planet carrier of the utility model;

[0015] Figure 3 This is a three-dimensional diagram of the main structure of the planet carrier of the utility model;

[0016] Figure 4 This is a front view of the prior art structure of the planetary gear of the utility model.

[0017] In the figure: 1. Planet carrier body; 2. Planet pin shaft hole groove. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0019] See also Figure 1-4The present invention provides a technical solution: a planetary gear, comprising a planet carrier body 1, a surface of the planet carrier body 1 is provided with a plurality of planet pin shaft hole grooves 2, the number of the planet pin shaft hole grooves 2 is a plurality of groups, the planet pin shaft hole grooves 2 are elliptical in shape, the plurality of groups of planet pin shaft hole grooves 2 are arranged in a ring array around the center of the planet carrier body 1, and the planet pin shaft hole grooves 2 of the planet carrier body 1 are installed with planet pins;

[0020] The planetary pin can be connected to any point of the center distance of the planetary pin shaft slot 2.

[0021] Preferably, a sun gear is also included, and the center of the planet carrier body 1 is connected to the sun gear. The center of the planet carrier body 1 and the sun gear can be connected by a bearing or directly by a mechanical connection method of bolts and pins. This connection method ensures the concentricity between the sun gear and the planet carrier body 1, thereby ensuring the accuracy of the transmission.

[0022] Preferably, a planetary wheel is also included, which is connected to the planetary pin through a bearing, and the planetary wheel rotates freely around the planetary pin.

[0023] Preferably, an inner gear ring is also included, which is arranged outside the planetary carrier body 1 and concentrically arranged with the planetary carrier body 1. The inner side of the inner gear ring has a tooth shape design, and these tooth shapes match the tooth shapes on the planetary wheels. The planetary wheels are meshed with the inner gear ring, that is, the teeth of the planetary wheels are embedded in the tooth grooves of the inner gear ring.

[0024] Preferably, the planetary pin is fixed to the planetary carrier body 1 by fixing parts, and the planetary pin can be fixed to the planetary carrier body using a special adhesive. Keyways can be machined on the planetary pin and the planetary pin shaft hole 2, and connection can be achieved using keys, and can be fixed according to actual usage.

[0025] By designing the shape of the planetary pin shaft hole groove 2 on the planetary carrier body 1 to be elliptical, the center distance of the planetary pins can vary within a certain range. In the traditional planetary gear design, different planetary gear systems may require planetary carrier bodies 1 of different sizes and structures to adapt to specific application requirements, which leads to a wide variety of materials and increased management difficulty. The design of the planetary pin shaft hole groove 2 with an elliptical structure enables the planetary gear on the planetary pin to automatically adjust its position within a certain range to maintain the optimal meshing state with the sun gear and the inner ring gear, so that a single planetary carrier body 1 can adapt to a variety of different planetary gear and gear configurations, thereby improving the versatility of the planetary carrier body 1. This means that different models of planetary gear systems can use the same or similar planetary carrier design, thereby significantly reducing the types of materials that need to be managed and inventory. Compared with the design of fixed planetary pin center distance in the prior art, the design of the present invention enables the planetary reducer to better adapt to different working environments and requirements, thereby improving the flexibility of equipment use.

[0026] Meanwhile, the contents not described in detail in this specification belong to the prior art known to those skilled in the art.

Claims

1. A planetary gear, characterized in that: It comprises a planet carrier body (1), the surface of the planet carrier body (1) is provided with a plurality of groups of planet pin shaft hole grooves (2), the number of the planet pin shaft hole grooves (2) is a plurality of groups, the planet pin shaft hole grooves (2) are elliptical in shape, the plurality of groups of planet pin shaft hole grooves (2) are arranged in a ring array around the center of the planet carrier body (1), and the planet pin shaft hole grooves (2) of the planet carrier body (1) are installed with planet pins; The planetary pin can be connected to any point of the center distance of the planetary pin shaft hole groove (2).

2. A planetary gear according to claim 1, characterized in that: It also includes a sun gear, and the center of the planet carrier body (1) is connected to the sun gear.

3. A planetary gear according to claim 1, characterized in that: It also includes a planetary wheel, which is connected with the planetary pin through a bearing.

4. A planetary gear according to claim 1, characterized in that: It also includes an inner gear ring, which is arranged outside the planet carrier body (1) and is arranged concentrically with the planet carrier body (1).

5. The planetary gear according to claim 1, characterized in that: The planet pin is fixed to the planet carrier body (1) via a fixing part.

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