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planetary gear

A technology of planetary gears and planetary shafts, applied in the field of planetary gear devices, can solve problems such as insufficient lubricity

Active Publication Date: 2017-04-12
SUMITOMO HEAVY IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] On the other hand, in the structure in which the rotary output is taken out from the internal gear (and the casing integrated with it) by restricting the orbital movement of the planetary shaft, when the amount of lubricating oil sealed in the casing is small, it is located higher than the oil surface The bearings around the planetary shafts (the bearings between the planetary shafts and the planetary gears) are not spread with lubricating oil, resulting in insufficient lubricity

Method used

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Embodiment Construction

[0020] figure 2 It is a cross-sectional view when the wheel drive device 100 incorporating the planetary gear device according to the embodiment of the present invention is cut along a vertical plane including the central axis. image 3 is along figure 2 A cross-sectional view taken along a plane perpendicular to the central axis along the line G-G in . Wheel drive device 100 is used in work vehicles such as forklifts, for example.

[0021] The wheel drive device 100 includes a speed reducer 10 as a simple planetary planetary gear unit, and figure 2 A motor (not shown) connected to the reducer 10 on the left side of the vehicle body.

[0022] The output shaft of the motor doubles as the input shaft 16 of the speed reducer 10 . An external gear 16A functioning as a sun gear of the planetary gear mechanism is press-fitted into a part of the outer surface of the input shaft 16 . In addition, other speed reduction mechanisms such as a parallel shaft gear mechanism or a pla...

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Abstract

The present invention provides a planetary gear device having a structure in which rotational force is taken out from a casing integrated with an internal gear by restricting the orbital motion of the planetary shaft, wherein even if the amount of lubricating oil sealed in the casing is small, it is sufficient Lubricate the bearings around the planet shafts. The planetary gear device (10) of the present invention includes: a planetary gear (24) supported by a planetary pin (20) via a cylindrical roller (22) which is a bearing; and an internal gear (28A). A plurality of planet pins are arranged offset from the axis center of the internal gear. The orbital movement of the planetary pin is restricted so that the rotary output can be taken out from the housing (30) integrated with the internal gear. Lubricating oil is enclosed in the housing in an amount such that bearings around some of the planetary pins are impregnated. A holding portion that holds lubricating oil inside while rotating is provided at a portion that rotates integrally with the housing.

Description

technical field [0001] This application claims priority based on Japanese Patent Application No. 2012-257924 filed on November 26, 2012. All the content of the application is incorporated in this specification by reference. [0002] The present invention relates to a planetary gear device. Background technique [0003] Known wheel drive devices that drive wheels of work vehicles such as forklifts include planetary gear units as speed reduction mechanisms in the devices. figure 1 It is a sectional view of the wheel driving device described in Patent Document 1. FIG. The housing 9 of the wheel drive device is fixed to the flange C with bolts B, and the flange C is fixed to a vehicle body (not shown) with bolts inserted through the bolt holes D. As shown in FIG. A planetary gear mechanism E serving as a speed reducer and a disc brake 6 are housed in the housing 9 . A wheel (not shown) is fastened by bolts A to a hub 12 located outside the vehicle body of the device. [000...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F16H57/04F16H57/023
CPCF16H57/042F16H57/0427F16H57/0479F16H57/0482F16H57/0471F16H57/0486B60K17/046
Inventor 石塚正幸
Owner SUMITOMO HEAVY IND LTD