JPH072658U - Lubrication mechanism of planetary bearings of planetary reducer - Google Patents

Abstract

(57) [Summary] [Purpose] In a planetary speed reducer, to allow sufficient lubrication of the portion of the planetary shaft. [Structure] Spiral lubricant supply grooves 6, 7, 8 and 9 are formed on an end surface 1a of a gear type planetary speed reducer on a side on which the planetary shafts 2, 3, 4, and 5 are mounted. Has been done. These grooves extend from the outer periphery of the carrier to each planet axle. A sufficient amount of lubricant is supplied to the portion of the planet shaft through these grooves.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a planetary speed reducer, and more particularly to a mechanism for supplying a lubricant to a planetary shaft that rotatably supports a planetary gear or a planetary roller.

[0002]

[Prior art]

 In a planetary speed reducer, for example, a planetary gear speed reducer equipped with a planetary gear, the clearance between the planetary gear and the planetary shaft is extremely small in order to reduce backlash and the like. For this reason, it is generally difficult to supply a sufficient amount of lubricant to these gaps during operation. Therefore, in the past, grease was applied between them at the time of assembly and maintenance-free after assembly.

[0003]

[Problems to be solved by the device]

 In this way, grease is applied in advance between the planetary shaft and the planetary gears, but the lubrication conditions for this gap are poor as described above, so there is a possibility that this part may become poorly lubricated after long-term use. is there.

An object of the present invention is to focus on this point and propose a lubrication mechanism capable of supplying sufficient lubricant to the portion of the planetary shaft in an operating state.

[0005]

[Means for Solving the Problems]

 In order to solve the above-mentioned problems, in the present invention, a lubricant that goes from the outer peripheral edge side to the planetary shaft is provided on the side surface of the carrier itself to which the planetary shaft that rotatably supports the planetary gear or planetary roller is attached. A supply groove is formed so that a sufficient amount of lubricant can be supplied to the portion of the planetary shaft during operation through the groove.

Instead of forming a lubricant supply groove on the side surface of the carrier itself, or together with this groove, a lubricant supply groove extending from its outer peripheral edge toward the planet shaft is formed on the side surface of the planetary gear or the planetary roller itself. It may be formed.

As described above, according to the present invention, since the lubricant supply groove toward the portion between the planetary gear or the planetary roller and the planetary shaft is formed, a sufficient amount of lubricant is passed through the groove. You can supply between these. Therefore, it is possible to eliminate the situation in which this portion falls into poor lubrication.

[0008]

【Example】

 Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows an example of a lubrication mechanism to which the present invention is applied. In this example, the present invention is applied to a planetary gear reducer, and the basic structure of the planetary gear reducer itself is the same as that which is generally used. That is, it has a sun gear attached to the input shaft, a plurality of planet gears meshing with it, and an internal gear meshing with these planet gears.Each planet gear is fixed to the side surface of the carrier. It is rotatably supported by the planet shaft. Since this structure is general, it is not shown in the drawing.

FIG. 1 shows a carrier used in such a planetary gear reducer. The carrier 1 of this example has a disk shape, and four planetary shafts 2, 3, 4, 5 are vertically fixed to one circular end surface of the carrier 1 at equal angular intervals. A planet gear (not shown) is rotatably attached to the planet shafts 2 to 5.

In this example, in the carrier 1, four lubricant supply grooves 6, 7, 8 and 9 are formed in the circular end surface 1a on the side where the planetary shaft is attached. Each groove is a spiral groove extending from the outer peripheral edge 1b of the carrier 1 toward the center of each planet shaft. The inner ends 6a, 7a, 8a, 9a of these grooves 6, 7, 8, 9 are located on the outer peripheral surfaces of the planetary shafts 2, 3, 4, 5 respectively.

FIG. 2 shows another embodiment of this example. In this example, on one circular end surface 11a of each planetary gear 11 rotatably supported by the planetary shafts 2, 3, 4, 5, a plurality of (in the illustrated example, extending from an outer peripheral edge 11b to an inner peripheral edge 11c thereof) 4) lubricant supply grooves 12, 13, 14, and 15 are formed. These grooves also have a spiral shape.

As described above, by forming the lubricant supply grooves toward the planetary shafts 2, 3, 4, and 5 on the end surface 1a of the carrier or the end surface 11a of the planetary gear, the carrier and the planetary gears during operation are By the rotation, the lubricant is supplied from the outer peripheral side toward the portion of the planetary shaft through these grooves. Therefore, a sufficient amount of lubricant can be supplied between the planetary shaft and the planetary gears, and there is no risk of poor lubrication at this part.

In these examples, the groove has a spiral shape, but as long as the lubricant can be supplied from the outer peripheral side according to the rotation of the carrier and the planetary gear, it is not limited to the spiral shape. Of course, grooves having other shapes may be adopted. Further, although the groove has a semicircular cross-sectional shape in these examples, it goes without saying that the groove may have a cross-sectional shape other than this.

Further, both the grooves shown in FIGS. 1 and 2 may be formed. Further, it goes without saying that the number of these grooves is not limited to the illustrated example.

Although the example described is a gear type planetary speed reducer, the present invention can be directly applied to a friction transmission type planetary speed reducer in which a planetary roller is incorporated.

[0017]

[Effect of device]

 As described above, in the present invention, the lubricant supply groove between the planetary gear or planetary roller and the planetary shaft rotatably supporting it is provided on the carrier end face, the planetary gear or the end face of the planetary roller. Has been formed. Therefore, when the planetary speed reducer is in operation, sufficient lubricant is supplied to the portion of the planetary shaft through these grooves. Therefore, it is possible to avoid the occurrence of poor lubrication in the portion between them.

[Brief description of drawings]

FIG. 1 is a perspective view showing a lubricant supply groove formed by a carrier incorporated in a planetary gear reducer to which the present invention is applied.

FIG. 2 is a perspective view showing a lubricant supply groove formed in a planetary gear incorporated in a planetary gear reducer to which the present invention is applied.

[Explanation of symbols]

 1 ... Carrier 1a ... Carrier end face 2, 3, 4, 5 ... Planetary shaft 6, 7, 8, 9 ... Lubricant supply groove 11 ... Planetary gear 11a ... Planetary gear end face 12, 13, 14, 15 ... Lubricant supply groove

Claims (3)

[Scope of utility model registration request] 1. A planetary speed reducer including a planetary gear or a planetary roller rotatably supported on each of a plurality of planetary shafts fixed to a carrier, wherein an end surface of the carrier to which the planetary shaft is fixed is A lubrication mechanism for planet bearings of a planetary speed reducer, wherein at least one lubricant supply groove extending from an outer peripheral edge toward each planet shaft is formed. 2. A planetary speed reducer comprising a planetary gear or a planetary roller rotatably supported on each of a plurality of planetary shafts fixed to a carrier, wherein a side surface of the planetary gear or the planetary roller has an outer peripheral edge. A lubrication mechanism for a planet bearing of a planetary speed reducer, wherein at least one lubricant supply groove extending toward the planet shaft is formed. 3. The planetary gear according to claim 1, wherein at least one lubricant supply groove extending from an outer peripheral edge of the planetary gear or the planetary roller toward a planetary axis is formed on a side surface of the planetary gear or the planetary roller. Lubrication mechanism for planetary bearings of reduction gears.