DE102018220533A1 - Planet carrier with service position - Google Patents

Abstract

The invention relates to a transmission with a transmission housing (103, 111, 113) and at least one rotatable planet carrier (109). The planet carrier (109) has a conical support surface (117); wherein the gear housing (103, 111, 113) has at least one support surface (119); and wherein a gap runs between the support surface (117) of the planet carrier (109) and the at least one support surface (119) of the gear housing (103, 111, 113).

Description

The invention relates to a transmission according to the preamble of claim 1. Such transmissions are preferably used in wind turbines. The invention further relates to a method according to claim 5.

In the case of maintenance or repair of such a transmission, it may be necessary to fix a planet carrier in a service position. This is particularly necessary when a bearing of the planet carrier or a component that carries the planet carrier has to be removed.

The invention has for its object to improve the maintenance and repair friendliness of a transmission. This object is achieved by a transmission according to claim 1 and a method according to claim 5. Preferred further developments are contained in the subclaims.

The transmission has a transmission housing and at least one rotatable planet carrier. The planet carrier is part of a planetary stage, which also has a ring gear, a sun gear and several planet gears. The planet gears are each rotatably supported in the planet carrier and mesh with the ring gear and / or the sun gear.

The planet carrier has a conical surface, i.e. part of the surface of the planet carrier is conical. A conical surface has the shape of an outer surface of a truncated cone. In the present case, a central axis or axis of symmetry of the surface coincides with an axis of rotation of the planet carrier.

The conical surface of the planet carrier is a support surface. A support surface is a surface which is designed to form a pair of support surfaces with a further support surface. The support surfaces of a pair of support surfaces lie against one another, preferably completely, and are supported against one another in at least one direction.

The conical surface of the planet carrier forms a pair of supporting surfaces with at least one supporting surface of the gear housing. This means that the conical surface of the planet carrier is designed to rest on the support surface of the gear housing and to be supported against it. The support takes place in exactly one axial direction. Due to the conical shape of the surface of the planet carrier, this causes the planet carrier to be fixed radially. In the event of maintenance or repairs, for example, a bearing of the planet carrier or another component that carries the planet carrier can be removed and replaced.

There is a gap between the two support surfaces. The gap is only filled with air and / or lubricant. The two support surfaces are therefore directly opposite.

A width of the gap is preferably uniformly distributed or constant. This ensures full contact of the two support surfaces.

The planet carrier can assume an operating position and a service position. The operating position is characterized by the presence of the gap between the two support surfaces. The gap ensures that the planet carrier can be rotated relative to the gear housing, in particular with respect to the support surface of the gear housing.

In a preferred development, the planet carrier can be detached. The storage is preferably also removable. The planet carrier can be moved to the service position by loosening and removing the bearing. This is characterized by a contact of the two support surfaces, so that the support surface of the planet carrier and the at least one support surface of the gear housing form a pair of support surfaces and the planet carrier is fixed.

The bearing can be one or more roller or slide bearings or a shaft, which in turn is supported at least twice, the planet carrier being releasably fixed on the shaft. The shaft can in particular be an input shaft, such as the input or main shaft of a wind turbine.

In order to transfer the planet carrier from the operating position to the service position, in preferred developments the transmission has at least one means for exerting an axial force on the planet carrier when the planet carrier is in the service position and / or at least one means for displacing the planet carrier in the axial direction. The means for exerting the axial force on the planet carrier serves to fix the planet carrier in the service position. The planet carrier can be moved from the operating position to the service position by means of the displacement of the planet carrier. In particular, the means for exerting the axial force and the means for displacing the planet carrier can be identical. In this case, the transmission has at least one means for exerting the axial force and for displacing the planet carrier in the axial direction. A screw or a hydraulic actuator is preferably used as such a means.

In a further preferred development, the transmission housing has at least one actuator. This forms the at least one support surface. The support surface can be moved radially with respect to an axis of rotation of the planet carrier by means of the actuator in order to bring the support surfaces into abutment against one another. An axial displacement of the planet carrier is then unnecessary. Here, too, a screw or a hydraulic actuator is preferably used.

• - Lösen der Lagerung des Planetenträgers; und
• - Verschieben des Planetenträgers in axialer Richtung, sodass die Stützfläche des Planetenträgers und die mindestens eine Stützfläche des Getriebegehäuses aneinander anliegen. Der Planetenträger wird also aus der Betriebsposition heraus bevorzugt durch Betätigen des oben beschriebenen Mittels in die Serviceposition überführt. (Zusätzlichen Anwendungsfall einfügen: Montage)

A method according to the invention for maintenance or repair of the transmission described above comprises the steps

• - loosen the bearing of the planet carrier; and
• - Moving the planet carrier in the axial direction so that the support surface of the planet carrier and the at least one support surface of the gear housing abut each other. The planet carrier is thus preferably moved from the operating position into the service position by actuating the means described above. (Insert additional use case: assembly)

• 1 eine Schnittdarstellung einer Planetenstufe.

A preferred embodiment of the invention is in 1 shown. In detail shows:

• 1 a sectional view of a planetary stage.

In the 1 planetary stage shown 101 has a ring gear 103 , a planet gear 105 , a planet bolt 107 and a planet carrier 109 on. The planet bolt 107 is in a shrink fit in the planet carrier 109 fixed. On the planet bolt 107 is the planet gear 105 rotatably mounted. It meshes with the sun gear 103 and one in 1 not shown ring gear.

The ring gear 103 forms part of a gearbox. For this it is with a first half of the housing 111 and a second half of the housing 113 screwed.

The first half of the case 111 forms a first support surface 115 out; the planet carrier 109 forms a second support surface 117 out. The first support surface 115 and the second support surface 117 are conical and face each other.

1 represents an operating position of the planet carrier 109 In the operating position runs between the two support surfaces 115 , 117 A gap. Through the gap 115 , 117 is the planet carrier 109 rotatable. It can be screwed to a main shaft, which is the planet carrier 109 wearing.

The planet carrier is for assembly, maintenance or repair work 109 convertible to a service position. This will be the planet carrier 109 axially displaced so that the two support surfaces 115 , 117 touch and the planet carrier 109 is fixed radially. The fixation allows the main shaft to support the planet 109 carries, assembles or disassembles in the operating state.

Reference symbol list

101

Planetary stage

103

Ring gear

105

Planet gear

107

Planet bolts

109

Planet carrier

111

first housing half

113

second housing half

115

first support surface

117

second support surface

119

Claims (6)

Gearbox with a gearbox housing (103, 111, 113) and at least one rotatable planet carrier (109); characterized in that the planet carrier (109) has a conical support surface (117); wherein the gear housing (103, 111, 113) has at least one support surface (119); and wherein a gap runs between the support surface (117) of the planet carrier (109) and the at least one support surface (119) of the gear housing (103, 111, 113). Gearbox after Claim 1 ; characterized in that a mounting of the planet carrier (109) is detachable. Transmission according to one of the preceding claims; characterized by at least one means for exerting an axial force on the planet carrier when the planet carrier is in a position in which the support surfaces (117, 119) abut one another. Transmission according to one of the preceding claims; characterized by at least one means for displacing the planet carrier (109) in the axial direction. Transmission according to one of the preceding claims; characterized in that the gear housing (103, 111, 113) has at least one actuator; wherein the actuator forms the at least one support surface (119); and being the at least one support surface (119) can be moved radially by means of the actuator. Procedure for the maintenance or repair of a transmission according to one of the Claims 2 to 6 , with the steps - loosening the bearing of the planet carrier (109); and - displacement of the planet carrier (109) in the axial direction, so that the support surface (117) of the planet carrier (109) and the at least one support surface (119) of the gear housing (103, 111, 113) abut each other.

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