Lubricant supply of an axial sliding bearing

Abstract

Arrangement with a planetary gear (105), a planetary pin (107), a thrust washer (111) and a lubricant line (112b, 112d, 203, 205, 301, 303, 401); wherein a bearing gap runs between the planetary gear (105) and the thrust washer (111), into which the lubricant line (112b, 112d, 203, 205, 301, 303, 401) opens; wherein the planetary pin (107) forms a first part (112b, 112d) of the lubricant line (112b, 112d, 203, 205, 301, 303, 401); wherein no part of the first part (112b, 112d) of the lubricant line (112b, 112d, 205, 301, 303, 401) is not formed by the planetary bolt (107); wherein the thrust washer (111) forms a second part (203, 205, 301, 303, 401) of the lubricant line (112b, 112d, 203, 205, 301, 303, 401); wherein no part of the second part (203, 205, 301, 303, 401) of the lubricant line (112b, 112d, 203, 205, 301, 303, 401) is not formed by the thrust washer (111); where the first part (112b, 112d) and the second part (203, 205, 301, 303, 401) of the lubricant line (112b, 112d, 203, 205, 301, 303, 401) open into one another; characterized in that that the first part (112b, 112d) of the lubricant line (112b, 112d, 203, 205, 301, 303, 401) opens into a lateral surface of the planetary bolt (107) and runs radially.

Description

[0001] The invention relates to an arrangement according to the preamble of claim 1.

[0002] Planetary gears are known from publications CN 207 486 023 U and CN 105 422 745 B that are axially supported against the flanges of a planet carrier by means of thrust washers. Separate lubricant lines are provided for the thrust washers. These are fed via a cavity in the planetary pin. A bore extends radially from the cavity. A bore extends axially from the radial bore toward a thrust washer. The thrust washer, in turn, has several bores that are connected to the axial bore for lubricant and introduce oil into a bearing gap between the planetary gear and the thrust washer.

[0003] Such a system of branched bores is comparatively complex. The radial bores must be routed through both the planetary pin and a flange of the planetary carrier. An additional axial bore is required to supply the oil to the thrust washers. Finally, the thrust washers themselves must also be provided with bores.

[0004] The invention is based on the object of providing an improved oil supply to thrust washers for supporting a planetary gear. In particular, the oil supply is to be simplified compared to the solutions known from the prior art.

[0005] This object is achieved by an arrangement according to claim 1. Preferred developments are contained in the subclaims and result from the embodiments shown in the figures.

[0006] The arrangement according to the invention comprises a planetary gear, a planetary pinion, a thrust washer, and a lubricant line. The arrangement is preferably part of a planetary stage, which also has a ring gear, a sun gear, and optionally further planetary gears with associated planetary pinions. The planetary gears are each rotatably mounted on a planetary pinion and mesh with the ring gear and / or the sun gear. Two of the three components—ring gear, planet carrier, and sun gear—are rotatably mounted, while the third component is fixed to the housing. The planet carrier and the sun gear are preferably rotatably mounted.

[0007] The planetary gear is rotatably mounted on the planetary pin by means of the thrust washer. The thrust washer serves as an axial plain bearing. This means that the thrust washer is designed to absorb axial forces from the planetary gear relative to the planetary gear's axis of rotation and transmit them to the planetary carrier. The planetary gear is supported axially against a flange of the planetary carrier via the thrust washer relative to the planetary gear's axis of rotation.

[0008] The thrust washer is fixed in the flange, meaning there is a non-rotatable connection between the flange and the thrust washer. A bearing gap runs between the planetary gear and the thrust washer. This gap is formed by a sliding surface of the planetary gear and a sliding surface of the thrust washer. Both sliding surfaces are circular in shape and are rotationally symmetrical to the planetary gear's axis of rotation. The sliding surfaces can be rotated relative to each other around the planetary gear's axis of rotation.

[0009] The planetary pin forms a first part of the lubricant line. No part of the first part of the lubricant line is not formed by the planetary pin. This does not preclude the planetary pin from forming the first part of the lubricant line together with other components. Thus, one or more parts of the first lubricant line can be formed by the planetary pin and one or more other components.

[0010] Preferably, however, the first part of the lubricant line is formed exclusively by the planetary pin. In particular, at least part of the first part of the lubricant line can be a bore formed in the planetary pin.

[0011] The thrust washer forms a second part of the lubricant line. No part of the second part of the lubricant line is not formed by the thrust washer. This does not preclude the thrust washer from forming the second part of the lubricant line together with other components. Thus, one or more parts of the second lubricant line can be formed by the thrust washer and one or more other components.

[0012] Preferably, however, the second part of the lubricant line is formed exclusively by the thrust washer. In particular, at least part of the second part of the lubricant line can be a bore formed in the thrust washer.

[0013] The invention provides that the first part and the second part of the lubricant line are directly connected to one another, in particular in a lubricant-conducting manner. The first part and the second part of the lubricant line thus merge directly into one another, i.e., without a further part of the lubricant line that connects the first part and the second part in a lubricant-conducting manner. This means that the first part and the second part of the lubricant line open into one another. In detail, at least one part of an opening of the first lubricant line and at least one part of an opening of the second lubricant line are identical.

[0014] The direct connection of the first and second parts simplifies the design of the lubricant line. In particular, a first part of the lubricant line can be realized that runs radially with respect to the rotational axis of the planetary gear. The invention eliminates the need for an axially extending intermediate piece between the first and second parts.

[0015] In order to create a lubricant-conducting connection between the first part and the second part of the lubricant line, the thrust washer, in a preferred embodiment, has a recess. The first part of the lubricant line opens into the recess. As a result, the first part of the lubricant line and the recess are connected to one another in a lubricant-conducting manner. The thrust washer has at least one bore, preferably running axially with respect to the axis of rotation of the planetary gear. The bore opens into the first recess. Consequently, the first recess establishes a lubricant-conducting connection between the first part of the lubricant line and the bore. The bore, in turn, is connected to the bearing gap in a lubricant-conducting manner. In this way, a lubricant-conducting connection is created between the first recess and the bearing gap and, consequently, between the first part of the lubricant line and the bearing gap.The first recess and the bore are parts of the second lubricant line.

[0016] The first recess is preferably designed as a circumferential groove. According to the further development, the groove thus runs in the circumferential direction, i.e., along a circular arc around the rotational axis of the planetary gear. Preferably, the recess runs completely around the rotational axis, so that the recess is self-contained. This means that the groove is rotationally symmetrical to the rotational axis of the planetary pin.

[0017] A groove is an elongated depression in a surface. It differs from other surface depressions in that it has a cross-section that remains constant along the groove's course. The cross-section is invariant with respect to a cutting plane oriented orthogonally to a curve describing the groove's course.

[0018] The groove, designed as a recess, allows a lubricant-conducting connection to be established between the first and second parts of the lubricant line, which is independent of the angular position of the thrust washer. The thrust washer can thus be mounted at any angular position relative to the planetary gear's axis of rotation. Alignment of the second part of the lubricant line with the first part is not required.

[0019] In a preferred embodiment, at least one bore opens into the sliding surface of the thrust washer. Thus, according to the embodiment, one opening of the bore is located in the sliding surface.

[0020] Alternatively, and equally preferably, the sliding surface is further developed with a second recess. The second recess is a lubricant pocket that serves to introduce lubricant into the bearing gap. According to the further development, the at least one bore opens into the second recess. An opening of the at least one bore thus lies in a wall of the second recess.

[0021] In a preferred embodiment, the first part of the lubricant line opens into a circumferential surface of the planetary pin. The first recess then preferably forms a cavity with the circumferential surface and, if appropriate, with a portion of the surface of a planetary carrier in which the planetary pin is fixed. This cavity belongs to the second part of the lubricant line. According to the embodiment, the first part of the lubricant line opens into the cavity.

[0022] A preferred embodiment of the invention is illustrated in the figures. Corresponding reference numerals indicate identical or functionally equivalent features. In detail: Fig. 1 a planetary stage in sectional view; Fig. 2 a sliding surface of a thrust washer; Fig. 3 a rear view of the thrust washer; and Fig. 4 a sectional view of the thrust washer.

[0023] The Fig. 1 planetary stage 101 comprises a planet carrier 103, planetary gears 105, a Fig. 1 not shown ring gear and one in Fig. 1 sun gear (not shown). The planetary gears 105 mesh with the ring gear and the sun gear.

[0024] Planetary pins 107 are fixed in the planetary carrier 103. A planetary gear 105 is rotatably mounted on each planetary pin 107 by means of a radial plain bearing 109 and two axial plain bearings. Thrust washers 111 serve as axial plain bearings. These are arranged between each planetary gear 105 and a flange of the planetary carrier 103. They support the planetary gear 105 axially in the respective flange of the planetary carrier 103.

[0025] For lubrication of the planetary gear bearings, the planetary pin 107 has a total of four bores. A first bore 112a runs parallel to a rotational axis 113 of the planetary gear 105. A second bore 112b, a third bore 112c, and a fourth bore 112d branch off orthogonally to the first bore 112a, i.e., in the radial direction relative to the rotational axis 113. The second bore 112b and the fourth bore 112d each connect the first bore 112a to a thrust washer 111 in a lubricant-conducting manner. The third bore 112c connects the first bore 112a to the radial plain bearing 109 in a lubricant-conducting manner.

[0026] Starting from the opening of the second bore 112b or the fourth bore 112d, the lubricant must be introduced into a bearing gap extending between the respective thrust washer 111 and the planetary gear 105. For this purpose, the thrust washers 111 are provided with an arrangement of recesses and bores. This is shown in the Fig. 2 to 4.

[0027] Fig. Figure 2 shows the sliding surface 201 of a thrust washer 111. The sliding surface 201 has lubricant pockets 203 in the form of elongated recesses extending radially relative to the rotational axis 113. Each of the lubricant pockets 203 contains an opening 205 for introducing lubricant. Starting from the openings 205, the lubricant is distributed radially over the entire sliding surface 201 due to the radial extension of the lubricant pockets.

[0028] Also in the Fig. In the rear view shown in Figure 3, the thrust washer 111 has openings 301. The openings 301 are located in a groove 303 that is rotationally symmetrical to the rotation axis 113.

[0029] As in Fig.As shown in Figure 4, two of the openings 205, 301 are the openings of a through bore 401. The bore 401 runs parallel to the rotational axis 113 and connects its two openings 205, 301 to each other in a lubricant-conducting manner. This creates a lubricant-conducting connection between the respective lubricant pocket 203 and the groove 303. Lubricant can thus be introduced into the lubricant pocket 203 via the groove 303 and the bore 401.

[0030] The groove 303 forms a cavity with a flange of the planet carrier 103 and the planet pin 107. The bores 401 of the thrust washer 111 open into this cavity. The second bore 112b or the fourth bore 112d also open into the cavity. Thus, a lubricant-conducting connection exists between the first bore 112a of the planet pin 107 and the lubricant pockets 203 via the second bore 112b or the fourth bore 112d, the cavity, and the bores 401 of the thrust washer 111. Reference symbol 101 Planetary Stage 103 planet carrier 105 Planetary gear 107 planetary bolts 109 radial plain bearings 111 thrust washers 112a first borehole 112b second borehole 112c third hole 112d fourth hole 113 axis of rotation 201 sliding surface 203 Lubricant bag 205 Mouth 301 Mouth 303 groove 401 bore

Claims

[1] Arrangement with a planetary gear (105), a planetary pin (107), a thrust washer (111) and a lubricant line (112b, 112d, 203, 205, 301, 303, 401); wherein a bearing gap runs between the planetary gear (105) and the thrust washer (111), into which the lubricant line (112b, 112d, 203, 205, 301, 303, 401) opens; wherein the planetary pin (107) forms a first part (112b, 112d) of the lubricant line (112b, 112d, 203, 205, 301, 303, 401); wherein no part of the first part (112b, 112d) of the lubricant line (112b, 112d, 205, 301, 303, 401) is not formed by the planetary bolt (107); wherein the thrust washer (111) forms a second part (203, 205, 301, 303, 401) of the lubricant line (112b, 112d, 203, 205, 301, 303, 401); wherein no part of the second part (203, 205, 301, 303, 401) of the lubricant line (112b, 112d, 203, 205, 301, 303, 401) is not formed by the thrust washer (111); where the first part (112b, 112d) and the second part (203, 205, 301, 303, 401) of the lubricant line (112b, 112d, 203, 205, 301, 303, 401) open into one another; characterized by , that the first part (112b, 112d) of the lubricant line (112b, 112d, 203, 205, 301, 303, 401) opens into a lateral surface of the planetary bolt (107) and runs radially. [2] Arrangement according to claim 1; characterized by , that the thrust washer (111) has a first recess (303) into which the first part (112b, 112d) of the lubricant line opens; wherein the thrust washer (111) has at least one bore (401) which opens into the first recess (303) and is connected to the bearing gap in a lubricant-conducting manner. [3] Arrangement according to the preceding claim; characterized by that the first recess (303) is designed as a circumferential groove. [4] Arrangement according to claim 2 or 3; characterized bythat the at least one bore (401) opens into a sliding surface of the thrust washer (111), which forms the bearing gap with a sliding surface of the planetary gear (105). [5] Arrangement according to claim 2 or 3; characterized by that a sliding surface of the thrust washer (111), which forms the bearing gap with a sliding surface of the planetary gear (105), has a second recess (203); wherein the at least one bore (401) opens into the second recess (203).

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