TWI626388B - Umlaufgetriebe, planetary gear - Google Patents

Abstract

The planetary gear transmission mechanism comprises a casing (10) in which a driving shaft connected to a sun gear (22) and an output shaft (30) coaxial therewith are mounted, the output shaft and a planetary carrier (32) engaging, the planetary gear (34) of the planetary carrier meshes with an inner diameter of a ring gear (36), and the ring gear is rotatably mounted in the casing (10) with a radial bearing (38), and It can be engaged with a hub (18) of the drive shaft via a shift sleeve (16). The sun gear (22) is supported on an axial bearing (24), and the output shaft (30) is rotatably mounted on a bearing housing with an inner radial bearing (40) and an outer radial bearing (42) ( 82) wherein an oil circuit (58) for lubricating the two radial bearings (40, 42) is disposed in the bearing housing, the oil line and an oil inlet groove (54) and in the output shaft (30) A plurality of oil passage junctions for lubricating the axial bearings (24) are formed. In the present invention, a connecting groove (70) is formed from the oil line (58) in the bearing housing (82), and a radial bearing (38) facing the ring gear (36) is mounted in the connecting groove. Injector (72).

Description

Planetary gear transmission

The present invention relates to a planetary gear transmission mechanism according to the preamble of claim 1 of the patent application. Such a planetary gear transmission or a planetary transmission (Planetegetriebe) is generally used as a two-speed transmission in a machine tool, which switches from a direct gear to a speed-up or deceleration gear by means of a shifting device. . Wherein the shifting is performed by a shiftable sleeve that is axially displaceable, the shifting sleeve being operated by an actuator of the shifting device, such as an electric motor equipped with a transmission, whereby the ring gear transmits through an internal flower The key is connected to the casing of the planetary gear train or the hub of the drive shaft.

A planetary gear transmission is known from the German patent DE 103 48 757 A1, as described in the preamble of claim 1 of the present invention. In order to lubricate the bearing, an oil line (Ölleitung) is provided in the casing of the planetary gear transmission, the oil line is supplied with oil by an oil pump and the oil is first transmitted to the two radial bearings of the output shaft. . The oil then flows through the oil line in the output shaft to the axial bearing of the sun gear. After the axial bearing is filled with oil, the oil overflows toward the inner wall of the casing, and the casing is surrounded by the wall. After flowing through the two radial and axial bearings, the oil continues to flow to the ring gear bearings. Since the oil path is relatively long, the oil pressure for bearing lubrication is already low.

Another disadvantage is that the ring gear sneaks into a closed casing oil sump, thereby generating heat that must be additionally discharged.

It is an object of the present invention to provide a planetary gear transmission mechanism, and is particularly suitable for use in a planetary gear transmission of a machine tool in which the ring gear bearing can be optimally lubricated and does not need to be immersed in an oil sump to avoid high temperatures.

In order to achieve the above object, the present invention forms a connecting groove in front of the shroud of the casing oil circuit leading to the two radial bearings, and a fuel injection nozzle is arranged in the connecting groove, and the fuel nozzle faces the ring gear. Radial bearing. Thereby, the injector outlet is located opposite the annular gap between the ring gear and the casing.

Compared with the prior art, the present invention has the advantage that the ring gear bearing can obtain the optimum lubrication of the high pressure due to the advancement of the connection groove of the injector. After lubricating all the bearings, the oil can flow out through an opening in the casing, eliminating the need for an oil sump.

Another feature of the present invention is that a radial seal ring is disposed in a ring cavity between the outer shaft radial bearing and the inner radial bearing of the output shaft, and the radial seal ring has an axial throttle hole, and the throttle hole is located inside. Opposite the radial bearing. By this form, a pressure sufficient to provide sufficient lubrication of the sun gear axial bearing through the output shaft oil line is formed in the annulus.

10‧‧‧Chassis

12‧‧‧ planetary gear mechanism

14‧‧‧Shifting device

16‧‧‧Shift casing

18‧‧‧ hollow wheel hub

20‧‧‧ radial bearings

22‧‧‧Sun Wheel

24‧‧‧Axial bearing

26‧‧‧Disc spring group

28‧‧‧ Pressure ring

30‧‧‧ Output shaft

32‧‧‧ Planetary carrier

34‧‧‧ planetary gear

36‧‧‧ring gear

38, 40, 42‧‧‧ radial bearings

44‧‧‧Inside bushing

46‧‧‧Outer bushing

48‧‧‧Circle

50‧‧‧ Radial seals

52‧‧‧Lock ring

54‧‧‧Intake tank

56‧‧‧ oblique section

58‧‧‧Oil pipeline

60‧‧‧Axial orifice

62, 68‧‧‧ channels

64‧‧‧radial through hole

66‧‧‧ longitudinal holes

70‧‧‧connection slot

72‧‧‧Injector

74‧‧‧ annular gap

76‧‧‧Shell Department

78‧‧‧ openings

80‧‧‧ bolt

82‧‧‧ bearing housing

Fig. 1 is a longitudinal sectional view showing a shiftable double-speed planetary gear transmission mechanism according to an embodiment of the present invention.

To fully understand the features and advantages of the present invention, the invention will be described in detail by the accompanying drawings. The figure is a shiftable double gear planetary gear Longitudinal section of the transmission mechanism.

As shown in Fig. 1, a planetary gear transmission mechanism (12) capable of shifting by a shifting device (14) is mounted in a casing (10). The shifting device (14) is fixed to the casing (10) for operating a shifting sleeve (16) that is axially displaceable.

The double-speed planetary gearing (12) has a hollow hub (18) which is rotatably mounted in the housing (10) by means of a radial bearing (20) and is used to accommodate a drive shaft in a rotationally fixed manner ( Not shown). The hub (18) is engaged with a sun gear (22) supported by a disc spring group (26) at a pressure ring (A) by an axial bearing (24). The pressure ring (28) is mounted to the output shaft (30) by a bolt (80) that is coupled to the planet carrier (32), the planet gear (34) of the planet carrier (32) and the ring gear ( Hohlrad) (36) has an inner diameter that is engaged. Here, the ring gear (36) is housed in a bearing housing (82) by means of a radial bearing (38) of a deep groove ball bearing (82) by means of a flange and a casing (10) Engagement.

The output shaft (30) is mounted in the bearing housing (82) by an inner radial bearing (40) and an outer radial bearing (42), both of which are cylindrical roller bearings here ( Zylinderrollenlager). The two bearings (40, 42) are axially separated from each other by an outer bushing (46) and an inner bushing (44) to form a ring cavity (48) in which the inner diameter is approximated. A radial sealing ring (50) at the locking ring (52) is placed in the position of the bearing (40).

a radial oil inlet groove (54) leading to the bearing housing (82), the oil inlet groove (54) It is coupled to an oil pump (not shown) and opens into an oblique section (56) of an oil line (58) in the bearing housing (82). The oil flows into the annular chamber (48) from the oil line (58) parallel to the longitudinal axis of the output shaft (30) through the outer radial bearing (42) and is in the ring under the action of the radial seal (50). A certain oil pressure is formed in the cavity. The radial seal ring (50) has an axial orifice (60) through which oil can also be supplied to the inner radial bearing (40).

Extending from the annular cavity (48) a passage (62) leading to a radial through hole (64) in the inner bushing (44), as shown in Fig. 1, a plurality of oils are arranged in the output shaft (30) The passage, including the radial through bore (64), extends through the output shaft (30) and is guided by two mutually parallel longitudinal bores (66) to a passage in the pressure ring (28) that is coupled to the longitudinal bore (66) ( 68), thereby obtaining an oil supply to the axial bearing (24).

In this embodiment, a connecting groove (70) is formed from the oblique section (56) of the oil line (58) in the bearing housing (82), and a nozzle (72) is disposed in the connecting groove. . The injector (72) is properly oriented such that the injector is aligned with an annular gap (74) between the ring gear (36) and a casing (76) and thus towards the radial direction of the ring gear (36) Bearing (38).

The oil flowing from the radial bearing (38) of the ring gear (36) and the axial bearing (24) flows toward the opening (78) in the bearing housing (82) and is discharged outward from the opening (78).

Claims (2)

A planetary gear transmission mechanism includes a casing (10) in which a drive shaft coupled to a sun gear (22) and an output shaft (30) coaxial with the drive shaft are mounted, the output shaft Engaged with a planetary carrier (32), a planetary gear (34) of the planetary carrier is engaged with an inner diameter of a ring gear (36), and the ring gear is rotatably mounted to the casing with a radial bearing (38) (10) and engageable with a hub (18) of the drive shaft via a shift sleeve (16), wherein the sun gear (22) is supported on an axial bearing (24), the output shaft ( 30) rotatably mounted in a bearing housing (82) with an inner radial bearing (40) and an outer radial bearing (42), the bearing housing being provided for lubricating the two radial bearings (40) , 42) an oil line (58) that engages an oil feed groove (54) and a plurality of oil passages formed in the output shaft (30) for lubricating the axial bearing (24), The oil line (58) in the bearing housing (82) is branched to form a connecting groove (70), and the radial bearing (38) facing the ring gear (36) is arranged in the connecting groove. a nozzle (72 The outlet of the injector (72) is located opposite an annular gap (74) that faces the radial bearing (38) of the ring gear (36) and is located in the ring gear (36) Between a shell (76). A planetary gear transmission according to claim 1, wherein the bearing housing (82) has at least one opening (78) leading to the outside.