JPH0117720Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of application of the invention] The invention relates to a planetary roller type transmission, and in particular,
The present invention relates to a planetary roller type transmission in which two stages of planetary roller type traction roller mechanisms are connected in series.

[Background of the idea]

A planetary roller type traction mechanism is used in a planetary roller type transmission device used in a speed increaser for a vehicle or the like. As shown in FIGS. 1 and 2, this traction mechanism includes a sun roller 10,
The sun roller 1 surrounds the sun roller 10 in its axial direction.
an outer ring 12 disposed on a concentric axis with 0;
Three planetary rollers 16 are fitted into the annular space 14 between the sun roller 10 and the outer ring 12 and come into rolling contact with the outer peripheral surface of the sun roller 10, and a drive shaft 18 is disposed on a concentric axis with the sun roller 10. A carrier 22 is connected to a roller support 20 that makes sliding contact with the outer peripheral surface of the planetary roller 16 and transmits the rotational drive of the drive shaft 18 to the planetary roller 16 via the roller support 20. When the planetary rollers 16 are rotated in the clockwise direction as viewed in FIG. The rotating shaft 26 connected to the sun roller 10 can be rotated at an increased speed by rotating around the sun roller 10 in a clockwise direction as viewed in FIG. 1.

In such a planetary roller type traction roller mechanism, oil is supplied to each part in order to smoothly rotate the sun roller 10 and the planetary roller 16. This oil supply method includes an oil jet supply method in which oil is supplied to the sun roller 10 and the planetary roller 16 through a stationary nozzle, and a rotary spray method in which oil is injected from the center hole of the sun roller by the rotation of the sun roller 10. Yes, the traction roller mechanism has
One or both of the above methods are used.

By the way, in order to increase the speed ratio of the traction roller mechanism, a structure in which two stages of traction roller mechanisms are cascaded has been used. For example, as shown in FIG. 3, this device includes a sun roller 10, an outer ring 12, and a planetary roller 1.
6. The first stage traction mechanism 30 equipped with the carrier 22 and the last stage traction mechanism 32 are connected to the sun roller 10 of the first stage traction mechanism 30 and the drive shaft 18 of the last stage traction mechanism 32, and the traction mechanism 30 of each stage is connected. Mechanisms are cascaded on concentric axes.

The drive shaft 18 of the traction mechanism 30 is connected to a pulley 34 as an input shaft, and the drive shaft 18 is supported by a housing 36 . The sun roller 10 of the traction mechanism 32 is connected to an output shaft 38. Note that the drive shaft 18 and output shaft 38 of each stage are supported by brackets 40, respectively.

The planetary roller transmission shown in Figure 3 has the following features:
Since it uses a rotary spray lubrication system,
The drive shaft 18 of the traction mechanism 30, the intermediate shaft 42 to which the traction mechanisms 30 and 32 are connected, and the sun roller 10 of the traction mechanism 32 each have an oil supply path 44 extending along the axial direction at the radial center thereof. is formed, and
An oil supply pipe 48 having an oil injection port 46 formed at its tip is inserted into the oil supply path 44 formed in the drive shaft 18 of the traction mechanism 30 with the oil injection port 46 facing the traction mechanism 32 side. ing.

In order to supply oil into the oil supply pipe 48,
The drive shaft 18 has an oil supply path 50 along the radial direction.
is formed therein, and an oil supply passage 52 is formed within the housing 36. Further, in the sun roller 10 of the traction mechanism 32, an oil supply passage 54 communicating with the oil supply passage 44 is formed along the radial direction.

In the device shown in FIG. 3 configured in this manner, when the drive shaft 18 of the traction mechanism 30 is rotationally driven by the rotation of the pulley 34, the rotational driving force is transmitted to the traction mechanism 32 via the intermediate shaft 42. It is transmitted to the sun roller 10, and the output shaft 38 can be rotated at high speed. Further, as the drive shaft 18 of the traction mechanism 30 is driven to rotate, oil is injected into the oil supply path 44 from the oil injection port 46 of the oil supply pipe 48, and the sun roller 1 of each stage is injected into the oil supply path 44.
0. The rotational drive of the planetary roller 16 is performed smoothly.

However, in the case of the device shown in FIG. 3, the oil supply pipe 48 is connected to the first stage (low speed stage) traction mechanism 3.
Since the rotation of the pulley 34 reaches a high-speed rotation range, the oil injected from the oil injection port 46 is expanded and dispersed by the centrifugal force of the drive shaft 18. , oil is not supplied to the oil supply path 44 of the traction mechanism 32 at the final stage (high speed stage), and as a result, the sun roller 10 and planetary rollers of the traction mechanism 32 cannot be sufficiently lubricated and cooled, resulting in heat generation, etc. As a result, there was a problem that the durability of the traction mechanism 32 was reduced.

[Purpose of invention]

The present invention has been made in view of the above-mentioned conventional problems, and its purpose is to improve the traction roller mechanism of a planetary roller type transmission in which the planetary roller type traction roller mechanism is connected on a two-stage concentric shaft. This ensures sufficient lubrication and cooling and improves the durability of the traction roller mechanism.

[Summary of the idea]

In order to achieve the above object, the present invention includes a sun roller, an outer ring that surrounds the sun roller in its axial direction and is arranged on a concentric axis with the sun roller, and a ring that is fitted into an annular space between the sun roller and the outer ring. A planetary roller that makes rolling contact with the outer circumferential surface, and a roller support that makes sliding contact with the outer circumferential surface of the planetary roller are connected to a drive shaft that is disposed on a concentric axis with the sun roller, and the rotational drive of the drive shaft is transmitted through the roller support. A traction mechanism comprising a carrier for transmitting transmission to the planetary rollers is arranged on a two-stage concentric shaft, and the first-stage sun roller and the last-stage carrier are connected,
An oil supply path is formed along the axial direction at the radial center of the drive shaft of each stage of sun roller and carrier.
An oil supply pipe with an injection port formed at the tip is inserted into the oil supply path of the first stage carrier with the oil injection port facing the final stage side, and the driving force from the rotational drive of the first stage carrier is applied to the final stage sun roller. In a planetary roller transmission, the oil supplied into the first stage oil supply passage is injected from an oil injection port into the oil supply passage by the rotational drive of the first stage carrier. ,
It is characterized in that it extends into the connecting portion between the first-stage sun roller and the final-stage carrier, and injects oil into the oil supply path of the connecting portion.

[Example of idea]

Hereinafter, preferred embodiments of the present invention will be described based on the drawings.

FIG. 4 shows the configuration of a preferred embodiment of the present invention. The apparatus in this embodiment connects the oil supply pipe 48 of the apparatus shown in FIG. 3 to the intermediate shaft 42.
The oil injection port 46 extends into the oil supply path 44 of the intermediate shaft 42 and injects oil from the oil injection port 46, and the other configurations are the same as the one in FIG. 3, so they are the same. are given the same reference numerals and their description will be omitted.

In the device of this embodiment, the oil supply pipe 48 is extended into the intermediate shaft 42, and the oil from the oil injection port 46 is injected into the oil supply path 44 in the intermediate shaft 42, so that the rotational drive of the pulley 34 is controlled. Even if the rotation reaches a high speed range, the oil injected from the oil injection port 46 will not reach the oil supply path 44 of the intermediate shaft 42.
This prevents the spray from expanding and ensures that the oil is supplied into the oil supply path 44 of the traction mechanism 32. Therefore, even if the pulley 34 is driven at a high rotation speed, the oil injected from the injection port 46 is injected into the oil supply path 44 of the traction mechanism 32.
This oil is supplied to the sun roller 10 and planetary roller 1 of the traction mechanism 32 through the oil supply path 44.
6. Therefore, the traction mechanism 32
The traction mechanism 32 is sufficiently lubricated and cooled, and the durability of the traction mechanism 32 can be improved.

FIG. 5 shows the structure of another embodiment of the present invention.

The device in this embodiment includes an oil supply path 56 that communicates with an oil supply path 44 for supplying oil to the sun roller 10 and the planetary rollers 16 along the radial direction of the sun roller 10 of the traction mechanism 30 shown in FIG. The oil supply pipe 4
A discharge hole 58 is formed in the middle of the pipe line 8, and the oil discharged from the oil discharge hole 58 is transferred to the oil supply line 56.
Sun roller 10 of traction mechanism 30 via
and the planetary rollers 16.

In the device of this embodiment, as the pulley 34 is driven to rotate, oil is injected from the oil injection port 46 into the oil supply path 44 of the traction mechanism 32, and oil discharge holes 58 are provided in the sun roller 10 and the planetary roller 16 of the traction mechanism 30. Since oil is supplied through the oil supply path 56, even when the rotational drive of the pulley 34 reaches a high speed range, the traction mechanisms 30 and 32 can be sufficiently lubricated and cooled, and the durability of the traction mechanisms 30 and 32 can be improved. You can improve your performance.

In each of the embodiments described above, it is possible to control the temperature of the oil supplied to the oil supply pipe 48 to an arbitrary temperature, so that the traction mechanisms 30, 32 can be controlled by adjusting the temperature of the oil to an appropriate temperature.
It is also possible to increase the torque capacity of.

Furthermore, in each of the embodiments described above, by varying the shape of the oil injection port 46, the traction mechanism 3
It is also possible to arbitrarily adjust the amount of oil supplied to 0 and 32.

[Effect of idea]

As explained above, according to the present invention, a two-stage planetary roller type traction mechanism is arranged on a concentric axis by connecting the sun roller at the first stage and the carrier at the last stage, and the sun roller at each stage is connected to the carrier at the last stage. An axial oil supply path is formed in the radial center of the drive shaft, and an oil supply pipe with an oil injection port formed at the tip directs the oil injection port toward the final stage to supply oil to the first stage carrier. In the planetary roller type transmission inserted into the road, the oil supply pipe extends into the connecting portion between the first stage sun roller and the final stage carrier, and the oil injected from the oil injection port is injected into the connecting portion. Even if the rotational drive of the first stage carrier is driven at a high rotation speed, the oil injected from the oil injection port is prevented from being expanded and sprayed by the oil supply inside the connection part, and the oil supply to the final stage traction mechanism is prevented. Since oil is reliably supplied into the passageway, the traction mechanism can be sufficiently lubricated and cooled, which has the excellent effect of improving the durability of the traction mechanism.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of a planetary roller type traction mechanism, Fig. 2 is a sectional view taken along the - line shown in Fig. 1, Fig. 3 is a sectional view of a conventional planetary roller type transmission, and Fig. 4 is a sectional view of the present invention. FIG. 5 is a sectional view of a main part of a planetary roller type transmission showing another embodiment of the present invention. 10... Sun roller, 12... Outer ring,
16... Planetary roller, 18... Drive shaft, 22...
Carrier, 30...First stage traction mechanism, 3
2... Final stage traction mechanism, 44, 50, 5
2, 54, 56...Oil supply path, 46...Oil injection port, 48...Oil supply pipe.

Claims (1)

[Claims for Utility Model Registration] (1) A sun roller, an outer ring that surrounds the sun roller in its axial direction and is disposed coaxially with the sun roller, and a ring that is fitted into an annular space between the sun roller and the outer ring. A planetary roller that makes rolling contact with the outer circumferential surface of the sun roller, and a roller support that makes sliding contact with the outer circumferential surface of the planetary roller are connected to a drive shaft disposed on a concentric axis with the sun roller, and the rotational drive of the drive shaft is transferred to the roller support. A traction mechanism is arranged on a two-stage concentric shaft, and the first stage sun roller and the last stage carrier are connected, and the diameter of the drive shaft of each stage sun roller and carrier is An oil supply path along the axial direction is formed at the center of the direction, and an oil supply pipe with an oil injection port formed at the tip is inserted into the oil supply path of the first stage carrier with the oil injection port facing the final stage side. The driving force generated by the rotational drive of the first-stage carrier is transmitted to the last-stage sun roller, and the oil supplied into the first-stage oil supply path is transferred from the oil injection port to the oil supply path by the rotational drive of the first-stage carrier. In a planetary roller type transmission that is injected into the
A planetary roller type transmission characterized in that the oil supply pipe extends into a connecting portion between a first stage sun roller and a final stage carrier, and oil is injected into an oil supply path of the connecting portion. (2) Utility model registration claim 1, characterized in that an oil discharge port is formed in the middle of the oil supply pipe, and oil is discharged from the oil discharge port into the oil supply path of the first stage sun roller. The planetary roller type transmission described in .