JPH0422119Y2 - - Google Patents

Description

[Detailed description of the invention] <Industrial application field> The present invention is a planetary roller type in which a plurality of planetary rollers are each supported by a carrier plate connected to one rotating shaft via a planetary shaft. It relates to a power transmission device.

<Prior Art> An example of a conventional planetary roller type power transmission device of this type will be described with reference to FIGS. 3 and 4.

In the figure, reference numeral 1 indicates a fixed ring 2 and a first rotating shaft 3.
A plurality of cylindrical planetary rollers are inserted in pressure contact at several points on the circumference between the shaft end 4 of the planetary roller 1, and a planetary shaft 6 is fitted into the hollow portion of each planetary roller 1 via a needle roller 5. It is matched. One end of each planetary shaft 6 is press-fitted into a shaft insertion hole 9 of a carrier plate 8 that is integrally formed with the shaft end of a second rotary shaft 7 coaxially arranged with the first rotary shaft 3 .

In the planetary roller type power transmission device having such a configuration, the internal clearance between the needle roller 5, the planetary roller 1, and the planetary shaft 6 corresponds to the backlash of the gear mechanism. In other words, if this internal gap is large, the responsiveness between the first rotating shaft 3 and the second rotating shaft 7 will deteriorate, so generally the internal gap is made as small as necessary.

<Problems to be Solved by the Invention> Incidentally, as an assembly procedure for a device having such a configuration, for example, each planetary roller 1 is fitted between the fixed ring 2 and the shaft end 4 of the first rotating shaft 3. rear,
A needle roller 5 and a planetary shaft 6 are attached to the hollow portion of each of these planetary rollers 1. A plurality of planetary shafts 6 are fitted into the hollow portions of each planetary roller 1 and arranged at mutually determined positions.
It is press-fitted into each shaft insertion hole 9 in the carrier plate 8 whose shaft center is located on a predetermined circumference.

Since the structure is such that the planetary shafts 6 are press-fitted into the shaft insertion holes 9, even one of the axes of the plurality of planetary shafts 6 and the plurality of shaft insertion holes 9 may be misaligned due to processing errors, etc. Then, the planetary shaft 6 cannot be inserted into the shaft insertion hole 9. If the planetary shaft 6 is forcibly inserted, excessive force will be applied to the planetary shaft 6, which may prevent it from operating smoothly.

Therefore, in the conventional device, the planetary shaft 6 and the shaft insertion hole 9 had to be precisely machined, which was extremely troublesome.

The present invention was devised in view of these circumstances, and allows for easy and accurate assembly of the planetary shaft and shaft insertion hole without having to precisely machine the shaft insertion hole as in the past. The purpose is to

<Means for solving the problems> In order to achieve the above object, the present invention has the following configuration.

That is, the planetary roller type power transmission device according to the present invention includes a plurality of planetary rollers that are interposed in a press-contact state at several points on the circumference between a fixed ring and the shaft end of a first rotating shaft that is inserted concentrically through the fixed ring. are each transmitted via the planetary axis,
The structure is supported by a carrier plate connected to a second rotation shaft arranged coaxially with the first rotation shaft, and a gap is formed between the planetary shaft and the shaft insertion hole of the carrier plate. However, the planetary shaft is fixed to the carrier plate by injecting resin into this gap.

<Effect> The effects of the configuration of the present invention are as follows.

Since a gap is formed between the shaft insertion hole of the carrier plate and the planetary shaft, the work of fitting the planetary shaft into the shaft insertion hole can be easily performed even if the relative positions of the two are deviated.

Also, when the planetary shaft is inserted into the shaft insertion hole, there will be a gap between the two, so
No excessive force is applied to the planetary shaft. Furthermore, since resin is injected into this gap to fix the planetary shaft to the carrier plate, no backlash will occur due to the gap.

<Example> Hereinafter, an example of the present invention will be described in detail based on the drawings.

An embodiment of the present invention is shown in FIGS. 1 and 2. In these figures, Figures 3 and 4
The same reference numerals as those in the figures refer to the same parts or corresponding parts.

The configurations of this embodiment that differ from the conventional example are as follows.

The hole diameter l of the shaft insertion hole 9 of the carrier plate 8 is made sufficiently larger than the diameter H of the planetary shaft 6, and a resin 10 is injected into the gap between the shaft insertion hole 9 and the planetary shaft 6 and hardened. Examples of the resin 10 include thermosetting resins such as aramid resins.

Furthermore, in this embodiment, a groove 11 continuous in the circumferential direction is formed particularly at the center position in the axial direction of the shaft insertion hole 9, while a groove 12 continuous in the circumferential direction is formed at the end of the planetary shaft 6. As a result, measures are taken to prevent the resin 10 from coming off after curing.

The rest of the configuration is the same as the conventional example, so the explanation will be omitted.

In this way, the shaft insertion hole 9 of the carrier plate 8
Since the hole diameter l is larger than the diameter H of the planetary shaft 6 to provide a gap between the two, even if the relative positions of the two are shifted, they can be easily and accurately fitted. Therefore, the planetary shaft 6 and the shaft insertion hole 9
There is no need for precise management when forming.

Furthermore, since a gap is created between the shaft insertion hole 9 and the planetary shaft 6 when the planetary shaft 6 is fitted into the shaft insertion hole 9, no unreasonable force is applied to the planetary shaft 6. Moreover, since the resin 10 is injected into the gap between the shaft insertion hole 9 and the planetary shaft 6 and hardened, no backlash will occur due to the gap between the planetary shaft 6 and the shaft insertion hole 9. Therefore, smooth operation can be ensured.

For this reason, for example, when the internal clearances between the needle roller 5, the planetary rollers 1, and the planetary shafts 6 are reduced to the necessary minimum in order to eliminate undesirable play corresponding to backlash in a gear mechanism, each planetary Even if the axes of the shaft 6 and each shaft insertion hole 9 are misaligned, if this gap is set so that the amount of misalignment is within the gap between the shaft insertion hole 9 and the planetary shaft 6, The planetary shaft 6 can be fitted into the shaft insertion hole 9 of the carrier plate 8 without difficulty.

In the above embodiment, a cantilever structure is described in which one end of the planetary shaft 6 is fixed to the carrier plate 8, but the present invention is not limited to this. It can also be applied to the case of a double-sided structure. Further, the present invention is not limited to the planetary roller type power transmission device having the illustrated structure, but can be applied to any structure in which the planetary roller 1 is supported on the carrier plate 8 via the planetary shaft 6.
Furthermore, in the embodiment described above, the diameter of the shaft insertion hole 9 is made larger than the diameter of the planetary shaft 6 to provide a gap between the two, but the diameter of the shaft of the planetary shaft 6 is made smaller than the diameter of the shaft insertion hole 9. Needless to say, a gap may be provided between the two. In addition, the resin slip-off prevention measures provided in the shaft insertion hole 9 and the resin slip-off prevention measures provided on the planetary shaft 6 are not limited to the shapes described in the above embodiments.

<Effect of the idea> According to the present invention, the following effects are achieved.

That is, since a gap is provided between the planetary shaft and the shaft insertion hole of the carrier plate, the fitting operation can be easily and accurately performed even if the relative positions of the two are shifted. Therefore, the planetary shaft and the shaft insertion hole do not need to be precisely machined as in the conventional case.

Furthermore, since the planetary shaft is fixed in the shaft insertion hole so that no excessive force is applied to the planetary shaft in the fitted state, smooth operation can be ensured.

[Brief explanation of the drawing]

1 and 2 show an embodiment of the present invention; FIG. 1 is a longitudinal cross-sectional view of the device of the present invention, and FIG. 2 is a cross-sectional view taken along the - line in FIG. 1. Further, FIGS. 3 and 4 relate to a conventional example, and FIG. 3 is a view corresponding to FIG. 1, and FIG. 4 is a cross-sectional view taken along the line -- in FIG. 1... Planetary roller, 2... Fixed wheel, 3... First
Rotating shaft, 4... Shaft end of first rotating shaft, 6... Planetary shaft, 7... Second rotating shaft, 8... Carrier plate, 9... Shaft insertion hole, 10... Resin.

Claims (1)

[Claims for Utility Model Registration] A plurality of planetary rollers are inserted in a press-contact state at several points on the circumference between a fixed ring and the shaft end of a first rotating shaft that is inserted concentrically through the fixed ring. In the planetary roller power transmission device configured to be supported by a carrier plate connected to a second rotating shaft coaxially arranged with the first rotating shaft, the planetary shaft and the shaft insertion hole of the carrier plate A planetary roller type power transmission device characterized in that a planetary shaft is fixed to a carrier plate by forming a gap between the carrier plate and the carrier plate and injecting resin into the gap.