JPH10339359A - Planetary roller type power transmitting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase rigidity against a twist, deflection, etc., of a planetary shaft, stabilize action of a planetary roller of rotation on its own axis and revolution round, in a planetary roller type power transmitting device. SOLUTION: In this planetary roller type power transmitting device A, relating to a plurality of planetary rollers 3 interposed in a press contact condition between a sun shaft 2 and a fixed shaft 1, respectively a planetary shaft 4 is inserted in a condition protruding both ends, the both ends of each planetary shaft 4 are supported by an input/output member 5 and a support member 12 arranged in axial direction both sides of a group of the planetary rollers 3. When the planetary shaft 4 is thus supported by both ends, as compared with the conventional overhung support, rigidity of the planetary shaft 4 against twist, deflection, etc., is enhanced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a planetary roller type power transmission device.

[0002]

2. Description of the Related Art FIG. 4 is a side view showing an upper half section of a conventional planetary roller type power transmission device. In the figure, A indicates the entire planetary roller type power transmission device.

[0003] The illustrated planetary roller type power transmission device A includes:
A fixed wheel 1, a sun shaft 2 having an axial end inserted through the inner periphery of the fixed wheel 1 concentrically from one side in the axial direction, and interposed in a press-contact state between the shaft end of the sun shaft 2 and the fixed wheel 1. Multiple planetary rollers 3
A planetary shaft 4 inserted through each of the planetary rollers 3 via a radial type rolling bearing 6, and an input / output member 5 coaxially arranged facing the shaft end of the sun shaft 2. In operation, when the sun shaft 2 is input, a deceleration output is obtained from the input / output member 5, and when the input / output member 5 is input, a speed-up output is obtained from the sun shaft 2. .

Reference numerals 7 and 7 denote regulating plates for regulating the axial displacement of the planetary roller 3, and reference numerals 8 and 9 denote retaining rings and sleeves for regulating the axial position of the radial type rolling bearing 6. As the above-mentioned radial type rolling bearing 6, a needle roller bearing including a needle roller and a retainer is used.

The above-mentioned input / output member 5 is generally called a carrier, and has, at one end of a shaft body 10, a through hole 11 a into which a solid planetary shaft 4 is press-fitted at several places around the circumference. 2 illustrates a configuration in which the plate 11 is fixed.

[0006]

By the way, in the above-mentioned conventional example, the planetary shaft 4 is cantilevered in through holes 11a provided at several places on the circumference of the annular plate 11 of the input / output member 5.
The rigidity of the planetary shaft 4 against twisting or bending may be insufficient, and the planetary roller 3 is likely to skew when rotating and revolving.

Therefore, an object of the present invention is to increase the rigidity of a planetary shaft against twisting or bending in a planetary roller type power transmission device and to stabilize the rotation and revolving operation of the planetary roller.

[0008]

A first planetary roller type power transmission device according to the present invention comprises a stationary wheel, and a sun shaft having an axial end passing through the inner periphery of the stationary wheel concentrically from one axial side. A plurality of planetary rollers interposed in a press-contact state between the shaft end of the sun shaft and the fixed wheel, a planetary shaft inserted with both ends protruding from each of the planetary rollers, and an axis of the sun shaft An input / output member that is disposed coaxially opposite the end and supports one end of the planetary shaft, and is rotatable relative to the outer periphery of a region side of the fixed wheel and protruding toward one axial side of the sun shaft. And a support member disposed to support the other end of the planetary shaft.

In such a configuration, since the planetary shaft is supported at both ends, the rigidity of the planetary shaft against twisting and bending is improved, and the skew of the planetary roller can be avoided.

[0010] A second planetary roller type power transmission device according to the present invention comprises a fixed wheel, a sun shaft having a shaft end inserted concentrically from one side in the axial direction into the inner periphery of the fixed wheel, and a shaft end of the sun shaft. A plurality of planetary rollers interposed in a pressure-contact state between the planetary roller and the fixed wheel, a planetary shaft inserted with both ends protruding from each of the planetary rollers, and a coaxial opposed to the shaft end of the sun shaft. An input / output member that is arranged in a shape and supports one end of a planetary shaft, and a planetary shaft that is disposed so as to be relatively rotatable on the outer periphery of a region side of the fixed wheel and protruding to one axial side of the sun shaft. And a thrust-type rolling bearing interposed between the support member and the fixed wheel.

[0011] In such a configuration, in addition to the first device, even when an axial load is applied, the relative positional relationship between the sun shaft and the input / output member is maintained and rotation loss is hardly caused.

The above-mentioned planetary shaft is formed hollow, and the hollow planetary shaft is sandwiched between the input / output member and the support member, and is provided outside the input / output member or the support member. Through a hollow planetary shaft from the support member or the input / output member, and insert a bolt in a state where it protrudes outward, and by screwing a nut to the protruding portion of this bolt, the input / output member and the support member It can be supported. In this case, it is advantageous for weight reduction and cost reduction as compared with the case where the planetary shaft is solid.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail with reference to the embodiments shown in FIGS.

1 and 2 relate to an embodiment of the present invention. FIG. 1 is a longitudinal sectional view of a planetary roller type power transmission device,
FIG. 2 is a partially cutaway front view of the planetary roller type power transmission device of FIG. In these figures, the same or corresponding parts as those in FIG. 4 showing the conventional example are denoted by the same reference numerals.

The illustrated planetary roller type power transmission device A includes:
A fixed wheel 1, a sun shaft 2 having an axial end inserted through the inner periphery of the fixed wheel 1 concentrically from one side in the axial direction, and interposed in a press-contact state between the shaft end of the sun shaft 2 and the fixed wheel 1. Multiple planetary rollers 3
A planetary shaft 4 inserted through each of the planetary rollers 3 via a radial type rolling bearing 6, and an input / output member 5 coaxially arranged facing the shaft end of the sun shaft 2. In operation, when the sun shaft 2 is input, a deceleration output is obtained from the input / output member 5, and when the input / output member 5 is input, a speed-up output is obtained from the sun shaft 2. .

Reference numerals 7, 7 denote regulating plates for regulating the axial displacement of the planetary roller 3 and the radial type rolling bearing 6. As the above-mentioned radial type rolling bearing 6, a needle roller bearing including a needle roller and a retainer is used.

The above-mentioned input / output member 5 is generally called a carrier, and has at one end of a shaft body 10 an annular plate 11 having a through hole 11a through which the planetary shaft 4 is inserted and supported at several places around the circumference. The illustrated configuration is illustrated.

This embodiment is characterized in that both ends of the planetary shaft 4 are supported by the input / output member 5 and an annular support plate 12 described below. That is, the above-described support plate 12
Is relatively rotatably disposed on the outer periphery of a region protruding toward one side in the axial direction of the sun shaft 2 on one side (the left side in the figure) of the fixed wheel 1. The planetary shaft 4 is formed to be hollow, and the hollow planetary shaft 4 is connected to the support plate 12 and the input / output member 5.
The hollow planetary shaft 4 is arranged so as to be sandwiched between the annular plate 11 and the bolt 14. The nut 15 is screwed into the protruding portion of the bolt 14 while being inserted in a protruding state.

Further, in this embodiment, the following configuration is provided in order to smooth the rotation operation even when an axial load is applied. First, a thrust type ball bearing 16 composed of a ball and a retainer is interposed between the support plate 12 and one (left side in the figure) regulating plate 7. The shaft end of the sun shaft 2 is formed in a conical shape, and the conical shaft end of the sun shaft 2 is interposed between the annular plate 11 of the input / output member 5 and the shaft end of the sun shaft 2. The inner ring of a radial type ball bearing 17 comprising an outer ring and a ball. That is, the radial type ball bearing 17 functions as a pivot bearing, and is for maintaining the relative position between the sun shaft 2 and the input / output member 5 with a small rotation loss. A lubricating plate 18 as a thrust slide bearing is interposed between the annular plate 11 of the input / output member 5 and the other (the right side in the figure) regulating plate 7. The lubricating plate 18 is for preventing the input / output member 5 from directly contacting the regulating plate 7 when an excessive axial load is applied from the input / output member 5 side.

As described above, if the both ends of the planetary shaft 4 supporting the planetary roller 3 are supported instead of being cantilevered, the rigidity of the planetary shaft 4 against twisting and bending is improved. Therefore, the skew of the planetary roller 3 can be avoided. Therefore, efficient power transmission can be realized, for example, the rotation loss of the planetary roller type power transmission device A can be reduced as much as possible. Further, if a thrust type ball bearing 16, a radial type ball bearing 17, and a lubricating plate 18 as a thrust slide bearing are provided as in the above-described embodiment, even when an excessive axial load is received, a planetary roller type power transmission device is provided. The rotation loss can be suppressed to a minimum while maintaining the relative positional relationship of the respective components of A, and more efficient power transmission can be realized.

It should be noted that the present invention is not limited to only the above embodiment, and various applications and modifications are conceivable.

(1) As shown in FIG. 3, the planetary shaft 4 may be made solid, with both ends having a small diameter and a thread groove provided on the outer periphery. In this case, the planet shaft 4
May be inserted into the insertion holes formed in the annular plate 11 and the support plate 12 of the input / output member 5 so as to protrude outward, and the nuts 15 and 15 may be screwed into the protruding portions. However, compared to this embodiment, the above embodiment is more advantageous in weight reduction and cost reduction.

(2) In each of the embodiment shown in FIG. 1 and the embodiment shown in FIG. 3, the structure for fixing the planetary shaft 4 is such that the shaft end is caulked using a rivet or the like. Are also included in the present invention.

(3) As the input / output member 5, for example, various forms such as one in which the shaft body 10 and the annular plate 11 are integrated or one in which the diameter of the shaft body 10 is increased and the annular plate 11 is eliminated is used. It can be.

(4) In the above embodiment, a structure in which all or any of the thrust type ball bearing 16, the radial type ball bearing 17, and the lubricating plate 18 are omitted is also included as an embodiment of the present invention.

(5) In the above embodiment, the radial type ball bearing 17 is used as the pivot bearing.
Although not shown, a single ball may be provided between the shaft end face of the sun shaft 2 and the shaft body 10 of the input / output member 5.

[0027]

According to the first and second aspects of the present invention, the planetary shaft is supported at both ends so as to improve the rigidity of the planetary shaft against torsion and bending, so that the skew of the planetary roller is prevented. It can be avoided reliably.
Therefore, efficient power transmission can be realized, for example, the rotation loss of the planetary roller type power transmission device can be reduced as much as possible.

In particular, according to the second aspect of the present invention, even when an excessive axial load is applied, the rotational loss can be suppressed to a minimum while maintaining the relative positional relationship between the components of the planetary roller type power transmission device. This makes it possible to realize more efficient power transmission than the first aspect of the present invention.

According to the third aspect of the present invention, it is possible to contribute to weight reduction and cost reduction as compared with the case where the planetary shaft is solid.

As described above, according to the present invention, it is possible to provide a planetary roller type power transmission device having excellent operation stability and high reliability.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a planetary roller type power transmission device according to an embodiment of the present invention.

FIG. 2 is a partially cutaway front view of the planetary roller type power transmission device of FIG. 1;

FIG. 3 is a longitudinal sectional view of a planetary roller type power transmission device according to another embodiment of the present invention.

FIG. 4 is a side view showing an upper half section of a planetary roller type power transmission device according to a conventional example.

[Explanation of symbols]

 Reference Signs List 1 fixed wheel 2 sun shaft 3 planetary roller 4 planetary shaft 5 input / output member 10 shaft member of input / output member 11 annular plate of input / output member 11a through hole of annular plate 12 support plate

Claims (3)

[Claims] 1. A fixed wheel, a sun shaft having an axial end penetrated from one side in the axial direction concentrically with the inner periphery of the fixed wheel, and a pressurized state interposed between the axial end of the sun shaft and the fixed wheel. A plurality of planetary rollers, a planetary shaft inserted with both ends protruding from each of the planetary rollers, and one end of the planetary shaft arranged coaxially opposite the shaft end of the sun shaft. An input / output member, and a support member that is disposed to be rotatable relative to the outer periphery of a region side of the fixed wheel and protrudes toward one axial side of the sun shaft and supports the other end of the planetary shaft, A planetary roller type power transmission device characterized by the above-mentioned. 2. A fixed wheel, a sun shaft having a shaft end inserted through the inner periphery of the fixed wheel concentrically from one side in the axial direction, and a press-fit state interposed between the shaft end of the sun shaft and the fixed wheel. A plurality of planetary rollers, a planetary shaft inserted with both ends protruding from each of the planetary rollers, and one end of the planetary shaft arranged coaxially opposite the shaft end of the sun shaft. An input / output member, a support member disposed to be rotatable relative to an outer periphery of a region side of the fixed wheel and protruding toward one axial side of the sun shaft, and supporting the other end of the planetary shaft; A planetary roller type power transmission device, comprising: a thrust type rolling bearing interposed between the power transmission device and a fixed wheel. 3. The planetary shaft is formed to be hollow, and the hollow planetary shaft is sandwiched between the input / output member and the support member, from outside the input / output member or the support member. A bolt is inserted through the hollow planetary shaft so as to protrude outward from the support member or the input / output member, and a nut is screwed into the protruding portion of the bolt to support the input / output member and the support member. The planetary roller type power transmission device according to claim 1, wherein the transmission is performed.