JPH0989064A - Friction type continuously variable transmission - Google Patents

Abstract

PROBLEM TO BE SOLVED: To cool lubricating oil so as to perform high speed rotation, in a friction type continuously variable transmission using a double cone. SOLUTION: An oil tank 10 is provided in a lower surface of a housing 13, an oil pump 11 sucking lubricating oil of the oil tank 10 is built in an input shaft 1 of a planet gear mechanism 2. After lubricating oil sucked by the pump 11 is cooled by an oil cooler, by supplying the lubricating oil to each required part in a speed change mechanism 21, lubrication is sufficiently performed, so that high speed rotation can be performed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a friction type continuously variable transmission using a double cone, more specifically, a centrifugal blower,
A shaft that drives a high-speed rotating body such as an impeller of a centrifugal compressor or a radial turbine is continuously variable so that the output shaft on which the impeller is mounted can rotate constantly even if the input shaft speed changes. The present invention relates to a lubrication structure for a friction type continuously variable transmission.

[0002]

2. Description of the Related Art A friction type continuously variable transmission in which a double cone is used for a speed change portion and can be rotated at a high speed even when the input shaft has a small number of revolutions is disclosed in Japanese Patent Application No.
Already proposed by No. 18790.

This friction type transmission, as shown in FIG.
The rotation of the input shaft 1 is input to the carrier of the planetary gear 3 of the planetary gear mechanism 2, accelerated, and output from the sun gear 4.
The speed change mechanism input wheel 5 is connected to the sun gear 4 of the planetary gear mechanism 2, and the rotation of the speed change mechanism input shaft 5 is accelerated at the contact portion between the outer ring 6 and the double cone 7, and then the double cone 7 The power is transmitted by being accelerated at the contact portion 9 of the output shaft 8. In this continuously variable transmission, the double cone 7 is configured to rotate only and not revolve.

In the lubrication system of this friction type continuously variable transmission, an oil tank 10 is provided below the continuously variable transmission, and an oil pump 11 is incorporated in the input shaft 1 of the planetary gear mechanism to strain the lubricating oil in the oil tank 10. Suck up through 12,
Internal pipes 14 and 15 are provided in the transmission housing 13 in order to supply lubricating oil to the required locations.

The friction type continuously variable transmission shown in FIG. 7 has the same basic structure as the friction type continuously variable transmission shown in FIG. 6, but since the rotation bearing of the double cone 7 is oil-lubricated, The structure is such that a lubricating passage for guiding lubricating oil from the front casing 16 to the carrier shaft 19 via the carrier guide 17 and the carrier 18 is provided.

In both friction type continuously variable transmissions, the lubricating oil sucked up by the oil pump 11 is guided to the front casing 16 by the internal pipes 14 and 15 provided in the housing 13. .

[0007]

By the way, in the friction type continuously variable transmission having a structure in which the lubricating oil sucked up by the oil pump 11 is guided to the front casing 16 by the internal pipes 14 and 15 provided in the housing 13, A new problem has been found that the temperature of the lubricating oil rises due to the heat generated in the frictional contact portion and exceeds the allowable temperature of the lubricating oil, and the output shaft cannot rotate at high speed.

Therefore, an object of the present invention is to cool the lubricating oil and supply it to the lubricating portion, to suppress the temperature rise of the lubricating oil and to rotate the output shaft at a high speed. An object of the present invention is to provide a friction type continuously variable transmission that can appropriately supply lubricating oil.

[0009]

In order to solve the above problems, the invention of claim 1 transmits the rotation of an input shaft to an output shaft via a double cone, and the double cone is directed in the axial direction of the input shaft. In a friction-type continuously variable transmission in which the rotation of the output shaft is changed by moving the output shaft to the It employs a configuration in which the outlet of the oil cooler is connected to the lubrication part of a friction type continuously variable transmission.

According to the second aspect of the invention, the oil supply from the outlet of the oil cooler to the lubrication portion of the friction type continuously variable transmission is branched into a plurality of lubrication paths by the manifold, and the flow control valves are provided in the respective branched lubrication paths. The configuration provided is adopted.

According to the third aspect of the present invention, the oil cooler is arranged so that the air flow generated by the fan of the oil cooler hits the housing.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to FIGS.

As shown in FIG. 1, the basic structure of the friction type continuously variable transmission is the same as that shown in FIG. 7, and FIGS.
The description will be replaced by attaching the same reference numerals to the same portions as.

As shown in FIGS. 1 and 2, the transmission mechanism 21 and the planetary gear mechanism 2 have a common housing 13, and a pump 11 using a trochoid pump is assembled at the center of the end of the housing 13. The lid member 23 that is embedded is attached.

The oil pump 11 has a rotor connected to the input shaft 1 of the planetary gear mechanism 2, and is configured to suck up lubricating oil from an oil tank 10 described later when the input shaft 1 rotates.

On the lower surface of the housing 13, an oil tank 10 in which lubricating oil inside the transmission is concentrated is attached,
A discharge hole 24 for discharging the lubricating oil to the oil tank 10.
Is formed on the bottom surface of the housing 13 on the transmission mechanism 21 side.

A communication hole 26 for allowing lubricating oil to flow is formed in the partition wall 25 of the housing 13 provided so as to separate the speed change mechanism 21 and the gear mechanism 2. The existence of this communication hole 26 causes the planetary gears to travel. The lubricating oil in the gear mechanism 2 returns to the oil tank 10.

A strainer 12 is provided inside the oil tank 10, and the strainer 12 is connected to the suction port of the oil pump 11 via an internal pipe 27 provided inside the wall surface of the housing 13.

As shown in FIGS. 3 and 4, an oil cooler 28 for cooling the lubricating oil is provided outside the housing 13, and one end is connected to the discharge port of the oil pump 11.
The other end of the outlet pipe 29 arranged outside the housing 13 is connected to the inlet of the oil cooler 28, and the outlet of this oil cooler 28 and the inlet of the lubrication passage of the manifold 30 attached to the outside of the housing 13 are external inlets. It is connected by a pipe 31.

The manifold 30 has a plurality of lubricating passages 32 branched therein, and each branched lubricating passage 32 is connected to a lubricated portion of a frictionless continuously variable transmission through an internal passage 33 provided in the housing 13. To be done. Therefore, the lubricating oil sucked up by the oil pump 11 is cooled by the oil cooler 28 and then distributed and supplied to each lubricated portion.

Each branched lubrication passage 3 of the manifold 30
2, a flow rate adjusting valve 34 is provided as shown in FIG. 1 so that the supply flow rate of the lubricating oil to each lubricated portion can be adjusted.

FIG. 1 shows a path for lubricating the bearing of the double cone 7, which is one of a plurality of branched lubrication paths. Manifold 30 through flow rate adjusting valve 34
In this example, the lubricating oil flowing out from the front casing 16 is connected to the carrier shaft 19 via the carrier guide 17 and the carrier 18 to lubricate the bearing of the double cone 7. The other lubrication path branched into a plurality is used, for example, for lubrication of the output bearing and the frictional contact portion. Here, an example in which the manifold 30 is branched into three lubrication paths is shown.
A flow rate adjustment valve 34 is attached to each of the three branched lubrication paths. Of course, three or more branches may be provided if necessary.

The oil cooler 28 is arranged so that the air flow generated by the fan of the oil cooler hits the housing 13 which is the main body of the continuously variable transmission main body. In FIG. 4, it is arranged substantially parallel to the input / output shaft of the continuously variable transmission,
Of course, even if the oil cooler 28 is not arranged substantially parallel to the input / output shaft of the continuously variable transmission, the desired object can be achieved if the airflow produced by the fan of the oil cooler 28 hits the continuously variable transmission main body.

Since the temperature of the air that has passed through the oil cooler 28 is lower than that of the housing 13 of the continuously variable transmission, the air flow can be guided to the housing 13 of the continuously variable transmission so that the housing 13 can be cooled. You can
That is, the fan of the oil cooler 28 can perform the cooling twice. The lubricating oil cooled by the oil cooler 28 enters the manifold 30 from the manifold inlet pipe 31.

The lubricating structure of the present invention is constructed as described above, and when the friction type continuously variable transmission is in operation, the lubricating oil in the oil tank 10 is sucked up by the oil pump 11 and passes through the outlet pipe 29. It is sent to the oil cooler 28.

The oil cooler 28 is blown by a fan provided outside, so that the lubricating oil passing through the cooler 28 is cooled, and the cooled lubricating oil passes from the inlet pipe 31 through the manifold 30. It is distributed and supplied to the lubrication required part of the friction type continuously variable transmission. At this time, the amount of lubricating oil supplied to the lubrication necessary portion can be adjusted to an optimum amount by the flow rate adjusting valve 34 provided in each lubricating passage 32 of the manifold 30.

The lubricating oil, which is thus supplied to the inside of the friction type continuously variable transmission mechanism 21 and the planetary gear mechanism 2 and lubricates the required portions, is returned to the oil tank 10 through the lubricating oil discharge hole 24. Then, it is sucked up again by the oil pump 11 and sent to each part through each external pipe and the manifold 30, and the circulation is repeated, and the oil is cooled by passing through the oil cooler 28 in the middle of this circulation flow,
Further, since the housing 13 itself is also cooled by the air flow created by the fan of the oil cooler 28, the temperature rise of the lubricating oil can be suppressed, the bearing and the friction contact portion can be sufficiently lubricated, and the output shaft 8 can be prevented. Can be rotated at high speed.

[0028]

As described above, according to the present invention, the lubricating oil of the friction type continuously variable transmission using the double cone can be circulated to lubricate the lubrication necessary portion, and the circulating lubricating oil can be used as the oil. Since the housing is also cooled at the same time as the cooling by the cooler, the temperature rise of the lubricating oil can be suppressed, the lubrication of the bearing and the friction contact portion can be surely performed, and the output shaft can be rotated at a high speed.

Further, by using the manifold for distributing the lubricating oil, the distribution of the lubricating oil is facilitated, the cost can be reduced by reducing the number of parts and the number of assembling steps can be reduced. By providing it, the amount of lubrication to each lubrication part can be easily set.

[Brief description of drawings]

FIG. 1 is a vertical sectional front view of a friction type continuously variable transmission according to the present invention.

FIG. 2 is a vertical sectional side view taken along the arrow II-II in FIG.

FIG. 3 is a front view of the same.

FIG. 4 is a plan view of the above.

FIG. 5 is a cross-sectional plan view of the manifold.

FIG. 6 is a vertical sectional front view showing a conventional friction type continuously variable transmission.

FIG. 7 is a vertical sectional front view showing another example of a conventional friction type continuously variable transmission.

[Explanation of symbols]

 1 input shaft 2 planetary gear mechanism 3 planetary gear 4 sun gear 6 outer ring 7 double cone 8 output shaft 10 oil tank 11 oil pump 13 housing 21 speed change mechanism 28 oil cooler 29 outlet pipe 30 manifold 31 inlet pipe 32 lubrication passage 34 flow rate adjustment valve

Claims (3)

[Claims] 1. A friction type continuously variable transmission in which the rotation of an input shaft is transmitted to an output shaft via a double cone and the rotation of the output shaft is changed by moving the double cone in the axial direction of the input shaft. In (1), the discharge port of the oil pump that sucks the lubricating oil and the inlet of the oil cooler provided outside the housing were connected by piping, and the outlet of this oil cooler was connected to the lubrication part of the friction type continuously variable transmission. Friction type continuously variable transmission. 2. An oil supply from an outlet of an oil cooler to a lubrication portion of a friction type continuously variable transmission is branched into a plurality of lubrication paths by a manifold, and a flow control valve is provided in each of the branched lubrication paths. The friction type continuously variable transmission according to claim 1. 3. The friction type continuously variable transmission according to claim 1, wherein the oil cooler is arranged so that the air flow generated by the fan of the oil cooler hits the housing.