JP3525285B2 - Vertical planetary gear reducer - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vertical planetary gear speed reducer suitable for a turning device in construction machines such as hydraulic excavators and hydraulic cranes.

[0002]

2. Description of the Related Art An example of a conventional vertical planetary gear speed reducer disclosed in Japanese Patent Laid-Open No. 7-4442 will be described with reference to FIG.

A rotating wheel 2 provided with an internal gear 2a is fixed to the lower traveling body 1, and a lower flange portion of a housing 4 is fixed to the rotating frame 3. A ring gear 5 forming an internal gear and a cover 6 sandwiching the ring gear 5 are fastened to the upper flange portion of the housing 4.
A hydraulic motor 7 is attached to the upper end position of. The cover 6 forms a flange portion of the hydraulic motor 7. The ring gear 5, the sun gear 8 provided on the transmission shaft 7a of the hydraulic motor 7, the carrier 9, the pin 10, and the plurality of planetary gears 11 constitute a reduction gear mechanism G.

An output shaft 12 rotated by a reduction gear mechanism G is supported in the housing 4 by an upper bearing 13 and a lower bearing 14. The gear 15 provided at the lower end of the output shaft 12 meshes with the internal gear 2 a of the turning wheel 2. Between the upper end surface of the gear 15 and the inner ring of the lower bearing 14, a sleeve 16 having an outer diameter dimension larger than the tip diameter of the gear 15 to some extent is attached. The outer peripheral surface of the sleeve 16 is in contact with an oil seal 17 attached to an oil seal attachment step formed on the housing 4.

[0005] Moreover, the utility model application publication No. Hei 3-14362.
In the gazette, a lubricating oil reserve tank is installed outside the reduction gear, and one of the two lubricating oil communication means is communicated with a portion of the reduction gear body facing the radially outer surface of the reduction gear device,
There is described a lubricating oil circulation device in which the other is connected to a portion of the speed reducer body facing the output shaft.

[0006]

In the vertical planetary gear reducer of the above-mentioned first conventional example, the lubricating oil on the side of the lower bearing 14 is generated by the rotation of the output shaft 12 when the device is in operation. Flow is created and the upper oil can be replaced to some extent, but an oil seal 17 is attached to the lower part of the lower bearing 14 and is a dead end. The bearing 14 is not positively lubricated. Further, in the conventional lubricating oil circulation device of the second reference, the device becomes bulky, resulting in high cost, and a sufficient lubricating effect cannot be obtained for lubricating the lower bearing.

The present invention has been made in view of these problems, and an object of the present invention is to provide a vertical planetary gear speed reducer capable of favorably lubricating the lower bearing with a simple structure. .

[0008]

The features of the configuration of the vertical planetary gear speed reducer of the present invention are that the lower end surface of the inner ring of the lower bearing is
A sleeve, the outer diameter of which is larger than the outer diameter of the outer ring of the lower bearing, is mounted between the upper end surface of the gear provided at the lower end of the output shaft and between the outer peripheral surface of the sleeve and the inner peripheral wall of the housing. An oil seal is interposed, and a concave portion is formed on the upper surface of the sleeve, which is curved upward from the contact surface with the inner ring of the lower bearing, and the upper end of the outer peripheral edge of the sleeve is attached to the outer ring of the lower bearing. An oil passage is provided near the lower end surface, and the inner peripheral wall of the housing has an oil passage whose lower end opens toward the upper outer peripheral edge of the sleeve and whose upper end opens inside the housing on the outer ring side of the upper bearing. It is in.

Further, on the lower surface of the sleeve, a concave surface portion is formed which is curved upward from the contact surface with the upper end surface of the gear of the output shaft toward the outer peripheral edge.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Next, an embodiment of the present invention will be described with reference to FIGS. In these figures, the same or corresponding components as in FIG. 5 are designated by the same reference numerals.

Between the lower end surface of the inner ring 14a of the lower bearing 14 and the upper end surface of the gear 15 of the output shaft 12, a sleeve 18 having an outer diameter larger than that of the outer ring 14b of the lower bearing 14 is attached. The outer peripheral surface 18 a of the sleeve 18 is in contact with the oil seal 17. The upper surface of the sleeve 18 is formed with a concave surface portion 18b which is curved upward from the contact surface with the inner ring 14a of the lower bearing 14, and the lower surface of the sleeve 18 is provided above the gear 15 of the output shaft 12. Concave surface portion 18 curved upward from the contact surface with the end surface toward the outer peripheral edge
c is formed. Upper edge 1 of the outer peripheral edge of the sleeve 18
8d is located near the lower end surface of the outer ring 14b of the lower bearing 14.

An arbitrary number, for example, three oil grooves 19 are provided in the inner surface of the housing around the outer ring 14b of the lower bearing 14, and an oil hole 20 is provided in the inner wall of the housing above the outer ring 14b. Has been. The lower end of the oil groove 19 is open to the outer peripheral edge of the upper side of the sleeve 18,
The lower end of the oil hole 20 is opened to the upper end of the oil groove 19, and the upper end is opened to the housing interior 4a of the upper bearing 13 on the outer ring 13b side. Lubricating oil is contained in the inside 4a of the housing 4.

With the rotation of the output shaft 12, the centrifugal force causes the lubricating oil to be pushed outward along the surface of the concave portion 18b of the sleeve 18, and then pushed up through the oil groove 19 and the oil hole 20. It goes out to the inside 4 a of the housing 4. In this way, the circulation of the lubricating oil is formed, and the lower bearing 14 and the upper bearing 13 are well lubricated.

The outer peripheral edge of the sleeve 18 is located near the outer ring 14b of the lower bearing 14, and the concave surface portion 1 is formed.
By providing 8c, the rise of grease (force in the direction of arrow Z in FIG. 2) pushed out by the meshing of the gear 15 of the output shaft 12 and the internal gear 2a is reduced, and the oil seal 1
It is possible to prevent damage to 7 and oil leakage from the oil seal 17.

FIG. 4 shows an oil hole 21 in which the lower end is open to the sleeve 18 side and the upper end is open to the housing interior 4a in the inner peripheral wall of the housing around the upper bearing 13 and the lower bearing 14.
Another embodiment of the present invention in which is provided is shown. Other configurations are similar to those described above.

[0016]

As described above, according to the present invention, the lubrication of the bearing that supports the output shaft is improved with a simple structure, and further, the damage and oil leakage of the oil seal with which the sleeve makes sliding contact can be prevented. Can be prevented.

[Brief description of drawings]

FIG. 1 is a sectional side view showing an embodiment of the present invention.

FIG. 2 is an enlarged sectional side view showing the output shaft and the upper and lower bearing portions of FIG.

3 is a cross-sectional plan view taken along the line XX of FIG.

FIG. 4 is a sectional side view showing another embodiment of the present invention.

FIG. 5 is a sectional side view showing an example of a conventional vertical planetary gear reduction device.

[Explanation of symbols]

2 slewing wheels 2a Internal gear 3 swivel frames G reduction gear mechanism 8 sun gears 9 career 11 planetary gears 12 Output shaft 13 Upper bearing 14 Lower bearing 14a inner ring 14b outer ring 15 gears 17 Oil seal 18 sleeves 18b concave part 18c concave part 18d Upper edge of outer peripheral edge 19 oil ditch 20 oil holes 21 oil hole

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Satoshi Shibukawa 650 Kandamachi, Tsuchiura-shi, Ibaraki Hitachi Construction Machinery Co., Ltd. Tsuchiura factory (72) Yuji Igawa 650 Kamimachi, Tsuchiura-shi, Ibaraki Hitachi Construction Machinery Engineering Co., Ltd. In-house (56) References Japanese Patent Laid-Open No. 7-4442 (JP, A) Actual Development 6-51610 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) F16H 57/04

Claims (2)

(57) [Claims] 1. A vertical planetary gear device in which an output shaft, which rotates in association with a gear reduction mechanism, is rotatably supported by an upper bearing and a lower bearing in a housing that contains lubricating oil. A sleeve whose outer diameter is larger than that of the outer ring of the lower bearing is installed between the lower end surface of the inner ring and the upper end surface of the gear provided at the lower end of the output shaft. An oil seal is interposed between the peripheral wall portion and a concave surface portion that is curved upward from a contact surface with the inner ring of the lower bearing, is formed on the upper surface of the sleeve,
The upper end of the outer peripheral edge of the sleeve is located near the lower end surface of the outer ring of the lower bearing, the lower end of the inner peripheral wall of the housing opens toward the upper outer peripheral edge of the sleeve, and the upper end of the upper bearing is A vertical planetary gear reduction device, characterized in that an oil passage that opens inside the housing on the outer ring side is provided. 2. The vertical planetary gear speed reducer according to claim 1, wherein the lower surface of the sleeve is provided with a concave portion which is curved upward from the contact surface with the upper end surface of the gear of the output shaft toward the outer peripheral edge.