Fixation of planetary bearings

Abstract

A transmission (101) with at least one planetary carrier (102), at least one ring gear (103), at least one planetary gearwheel (105), at least one planetary bolt (107), one or more planetary bearings (109) and at least one sun gear (111). The planetary bolt (107) is fixed into the planetary carrier (102). The planetary gearwheel (105) is mounted to rotate on the planetary bolt (107) by way of the planetary bearing (109). The planetary gearwheel (105) meshes with the ring gear (103) and/or the sun gear (111). The transmission (101) includes at least one nut (123). The nut (123) screws onto an external thread (121) of the planetary bolt (107). The planetary bearings (109) are axially fixed by the nut (123) and a shoulder (125) of the planetary bolt (107).

Claims

1. A transmission (101) comprising at least one planetary carrier (102), at least one ring gear (103), at least one planetary gearwheel (105), at least one planetary bolt (107), at least one planetary bearing (109) and at least one sun gear (111); the planetary bolt (107) being fixed into the planetary carrier (102); the planetary gearwheel (105) being mounted to rotate on the planetary bolt (107) by the at least one planetary bearing (109); the planetary gearwheel (105) meshing with at least one of the ring gear (103) and the sun gear (111); at least one nut (123) such that the at least one nut (123) screws onto an external thread (121) of the planetary bolt (107); and the at least one planetary bearing (109) being axially fixed by the nut (123) and a shoulder (125) of the planetary bolt (107), and the at least one planetary bearing axially abutting the nut and the shoulder of the planetary bolt.

2. The transmission according to claim 1, further comprising at least one pin (129) and at least one recess (131), the at least one pin (129) engages in the recess (131) so that the nut (123) is secured against rotation relative to the planetary carrier (102), and either: the nut (123) contains the pin (129) and the planetary carrier (102) contains the recess, or the nut (123) contains the recess (131) and the planetary carrier(102) contains the pin (129).

3. A method for assembling a transmission (101) having at least one planetary carrier (102), at least one ring gear (103), at least one planetary gearwheel (105), at least one planetary bolt (107), one or more planetary bearings (109) and at least one sun gear (111), the planetary bolt (107) is fixed into the planetary carrier (102), the planetary gearwheel (105) is mounted to rotate on the planetary bolt (107) by the planetary bearing (109), the planetary gearwheel (105) meshes with at least one of the ring gear (103) and the sun gear (111), at least one nut (123) such that the at least one nut (123) screws onto an external thread (121) of the planetary bolt (107), and the planetary bearings (109) are axially fixed by the nut (123) and a shoulder (125) of the planetary bolt (107), and at least one pin (129) and at least one recess (131), the pin (129) engages in the recess (131) so that the nut (123) is secured against rotation relative to the planetary carrier (102), and either the nut (123) contains the pin (129) and the planetary carrier (102) contains the recess; or the nut (123) contains the recess (131) and the planetary carrier(102) contains the pin (129), the method comprising: positioning the nut (123); positioning the planetary bearing (109) and the planetary gearwheel (105); introducing the planetary bolt (107); rotating the nut (123) and the planetary bolt (107) relative to one another; and fixing the planetary bolt (107) into the planetary carrier (102).

4. The method according to claim 3, further comprising positioning the nut (123) in the planetary carrier (102) in such a manner that the pin (129) engages in the recess (131) so that by rotating the planetary bolt (107) relative to the planetary carrier (102), the nut (123) and the planetary bolt (107) rotate relative to one another.

5. A transmission comprising at least one planetary carrier, at least one ring gear, at least one planetary gearwheel, at least one planetary bolt, at least one planetary bearing and at least one sun gear; the planetary carrier having at least one bolt seat which receives a first axial end of the planetary bolt such that the planetary bolt being rotationally and axially fixed with respect to the planetary carrier, the planetary carrier supporting planetary bearings which support the planetary gearwheel such that the planetary gearwheel being rotatable with respect to the planetary bolt and the planetary carrier; the planetary gearwheel meshing with at least one of the ring gear and the sun gear; and the planetary carrier comprising recesses, each of the recesses receives a pin that mates with a nut, the nuts abut an axial side surface of the planetary bearings such that the planetary bearings being axially fixed along the planetary bolt between the nuts and a shoulder of the planetary bolt on a second axial end thereof.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) Preferred example embodiments of the invention are illustrated in the figures, in which the same indexes are used for the same or functionally equivalent features. In detail, the figures show:

(2) FIG. 1: A planetary transmission, and

(3) FIGS. 2a to 2c: A method for assembling the transmission.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

(4) The planetary transmission 101 shown in FIG. 1 comprises a planetary carrier 102, a ring gear 103, a planetary gearwheel 105, a planetary bolt 107, planetary bearings 109 and a sun gear 111. Inner rings of the planetary bearings 109 are pushed onto the planetary bolt 107. Outer running surfaces of the planetary bearings 109 are formed by the planetary gearwheel 105. The planetary gearwheel 105 and the outer rings of the planetary bearings 109 are thus made integrally. By virtue of the arrangement described, the planetary gearwheel 105 is mounted so that it can rotate on the planetary bolt 107.

(5) The planetary carrier 102 comprises bolt seats 113, which fix the planetary bolt 107 with interlock in the radial direction. Furthermore, the planetary bolt 107 can be fixed in the axial direction by friction force, by means of a shrink fit in the bolt seats 113. In addition, in the example embodiment shown a retaining ring 115 is provided, which ensures an interlocked fixing of the planetary bolt 107 in the axial direction.

(6) The ring gear 103 is integrated in a transmission housing 117. In this case the ring gear 103 is fixed solidly in the transmission housing 117, Le, without the possibility of any relative movement and in particular in a rotationally fixed manner.

(7) In contrast, the planetary carrier 102 is held in the transmission housing 117 so that it can rotate by virtue of two bearings 119. The sun gear 111 as well is designed to rotate relative to the transmission housing 117.

(8) The planetary bolt 107 has an outer thread 121. Onto this is screwed a nut 123, Opposite the nut, the planetary bolt 107 forms a shoulder 125. The planetary bearings 109 are located axially between the nut 123 and the shoulder 125. Between the planetary bearings 109, in turn, there is a spacer 127. This determines a minimum distance of the inner rings of the planetary bearings 109 from one another. Since the planetary bearings 109 are braced between the nut 123 and the shoulder 125, a defined bearing play is set. For this, the inner rings of the planetary bearings 109 are pressed against the spacer 127.

(9) The nut 123 is provided with pins 129, Corresponding bores 131 in the planetary carrier 102 receive the pins 129. In this way the nut 123 is rotationally fixed relative to the planetary carrier 102.

(10) FIGS. 2a to 2c make clear the assembly method of the transmission 101. In a first step illustrated in FIG. 2a, the nut 123 is positioned in the planetary carrier 102. To receive the pins 129, the nut 123 has through-going bores. After its insertion the nut is turned so that the bores of the nut are aligned with the bores 131 in the planetary carrier so that the pins 129 can be inserted.

(11) Then, the planetary bearings 109 are introduced together with the planetary gearwheel 105 into the planetary carrier 102 and positioned in such manner that the planetary bolt 107 can be fitted.

(12) The planetary bolt 107 is inserted into the planetary carrier 102 far enough for the nut 123 to be in contact with the external thread 121 of the planetary bolt 107. This is shown in FIG. 2b.

(13) Now, the external thread 121 is screwed into the nut 123 by rotating the planetary bolt 107. During this, the pins 129 prevent the net 123 from rotating.

(14) Finally, the retaining ring 115 can be fitted into a groove of the planetary carrier 102 provided for that purpose. This is shown in FIG. 2c.

INDEXES

(15) 101 Planetary transmission 102 Planetary carrier 103 Ring gear 105 Planetary gearwheel 107 Planetary bolt 109 Planetary bearings 111 Sun gear 113 Bolt seat 115 Retaining ring 117 Transmission housing 119 Bearing 121 External thread 123 Nut 125 Shoulder 127 Spacer 129 Pin 131 Bore