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DE-102024210831-A1 - Planetary carrier, assembly method and system

DE102024210831A1DE 102024210831 A1DE102024210831 A1DE 102024210831A1DE-102024210831-A1

Abstract

The invention relates to a planet carrier (10) for a planet gear set. The planet carrier (10) has a support (12) and at least one planet bolt (14) mounted thereon. The support (12) has a first receptacle (22) and a second receptacle (24) between which the planet bolt (14) is mounted. The two receptacles (22, 24) are misaligned relative to each other. The invention also relates to an assembly method and a system.

Inventors

  • Alfred Junk

Assignees

  • ZF FRIEDRICHSHAFEN AG
  • ZF WIND POWER ANTWERPEN N.V.

Dates

Publication Date
20260513
Application Date
20241112

Claims (11)

  1. Planet carrier (10) for a planet gear set, wherein the planet carrier (10) has a carrier (12) and at least one planet bolt (14) mounted thereon, wherein the carrier (12) has a first receptacle (22) and a second receptacle (24) between which the planet bolt (14) is mounted, wherein the two receptacles (22, 24) have a positional deviation from each other.
  2. Planetary carrier (10) after Claim 1 , characterized in that the positional deviation of the two mounts (22, 24) induces a preload in the planetary bolt (14).
  3. Planetary carrier (10) after Claim 1 or 2 , characterized in that the positional deviation has an eccentricity.
  4. Planetary carrier (10) after Claim 3 , characterized in that the first receptacle (22) is arranged eccentrically in the circumferential direction relative to the second receptacle (24).
  5. Planetary carrier (10) according to one of the preceding claims, characterized in that the first mount (22) is inclined relative to the second mount (24).
  6. Planetary carrier (10) according to one of the preceding claims, characterized in that the carrier (12) is formed in one piece.
  7. Planet carrier (10) according to one of the preceding claims, characterized in that the carrier (12) has a first element which forms the first receptacle (22) and a second element which forms the second receptacle (24), wherein the two elements are rotatable relative to each other for setting a relative position, and wherein the carrier (12) is designed to fix the two elements to each other in a set relative position.
  8. Method for mounting the planet carrier (10) according to Claim 7 , wherein the method comprises at least the following steps: - Setting a first relative position of the two elements in which the two mounts (22, 24) are aligned with each other; - Arranging the planetary bolt (14) on the two mounts (22, 24); - Setting a second relative position of the two elements in which the two mounts (22, 24) have a predetermined positional deviation from each other.
  9. System with a planetary gear set, which connects a planet carrier (10) to one of the Claims 1 until 7 and has a planet gear which is mounted on the planet bolt (14).
  10. Annex according Claim 9 , characterized in that the positional deviation of the two mounts (22, 24) relative to each other is matched to a deformation of a further rotating element of the planetary gear set during operation of the system.
  11. Annex according Claim 9 or 10 , characterized in that the positional deviation of the two recordings (22, 24) relative to each other is aligned with a predicted load pattern during operation of the plant.

Description

The present invention relates to a planet carrier. Furthermore, the invention relates to a method for assembling a planet carrier and to a system for this purpose. State of the art Gearboxes can incorporate a planetary gear set, for example, to provide a high gear ratio. Such gearboxes are used, for instance, in wind turbines or hydroelectric power plants, which generate electricity from wind or water energy. An input shaft of the gearbox can be connected to a rotor shaft of such a plant. During operation, the rotor shaft can deform due to applied loads. Similarly, the planet carrier can deform under these loads. This can negatively affect the contact pattern of the planetary gear set's teeth. For example, planetary pins in a planet carrier can bend during operation, causing the teeth of the planetary gear set to mesh differently than intended. This can increase wear. Furthermore, a lubricating film can be locally interrupted, for example, in a planetary gear's plain bearing. This can increase friction, which can not only increase wear but also reduce efficiency. In the DE 10 2018 211 161 A1 A deformation-optimized planetary bolt is described. This planetary bolt has a shape that deviates from a cylindrical or other rotationally symmetrical form, such as an S-shaped profile. Under loads acting during operation, the planetary bolt is then straightened, for example. The shape of the planetary bolt can thus compensate for deformation during operation. However, the manufacturing of such a planetary bolt is complex. Description of the invention A first aspect concerns a planet carrier for a planetary gear set. The planetary gear set can be part of a gearbox. A planetary gear set can have three rotating elements. The planet carrier can be a rotating element of the planetary gear set within the gearbox. A planetary gear set is designed, for example, as a negative planetary gear set or a positive planetary gear set. A planetary gear set includes, for example, a sun gear, a planet carrier, and a ring gear. The sun gears, planet carrier, and ring gears of a planetary gear set, for example, constitute its rotating elements. Each planetary gear set can have one or more planet gears, which are rotatably mounted on the planet carrier. For example, the planet gears of a planetary gear set each mesh with a sun gear and a ring gear of another planetary gear set. For this purpose, the sun gear and the planet gears can have teeth on their outer circumference, and the ring gear can have teeth on its inner circumference. The teeth can be straight or helical. An axis of rotation of a planetary gear set can correspond to an axis of rotation of its rotating elements. The planet carrier comprises a support and at least one planet bolt mounted thereon. The support can be a single piece or multi-part. The planet bolt can be a separate component from the support. The planet bolt can be designed to accommodate a planet gear. For example, a planet gear is mounted on each planet bolt. The planet bolt can be rotatably or non-rotatably mounted on the planet gear set. The planet gear can also be rotatably or non-rotatably mounted on the planet bolt. For example, the planet gear can be rotatably mounted on the planet bolt using a plain bearing or roller bearing, and the planet bolt can be fixed to the support. The following text refers only to the planetary bolt. If multiple planetary bolts are provided, corresponding specifications may apply to some or all of them. For example, three, four, or five planetary bolts may be provided. The planetary gear set may have a corresponding number of planetary gears. The carrier has a first receptacle and a second receptacle between which the planetary bolt is mounted. For each planetary bolt, the carrier can have a set of two such associated receptacles. A receptacle can, for example, be designed as a recess or through-opening in which the planetary bolt is partially positioned. The planetary bolt is, for example, positioned with an associated end region in each of the two receptacles. A receptacle can also be designed as a projection that engages in a corresponding recess of the planetary bolt. The receptacles can be arranged on axially opposite sides of the planetary carrier. The first receptacle is, for example, formed on a first end region of the planetary carrier, and the second receptacle on a second end region axially opposite it. The first receptacle is, for example, formed in a first cheek of the planetary carrier, and the second receptacle is, for example, formed in a second cheek of the planetary carrier. A cheek can be The axially extending wall section of the planet carrier is called the planet carrier. One cheek, for example, can be essentially ring-shaped. The two cheeks can be formed integrally or as separate elements. The two mounts and cheeks can be spaced apart by the axial length of the planet gear. The two mounts can have an identical cross-section or an identical overall shape. Th