JP2548172Y2 - Friction type continuously variable transmission - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a friction type continuously variable transmission using a double cone, and particularly to a forced lubrication structure for a bearing supporting the double cone.

[Conventional technology]

FIG. 3 shows a conventional continuously variable transmission using a double cone (composite conical trochanter), in which a plurality of double cones are arranged around an input shaft 1 and an output shaft 2 which are coaxially arranged. 3, the drive cone 4 attached to the input shaft 1 is brought into contact with one of the conical surfaces 3a of the double cone 3 with an appropriate pressure,
The outer ring 5 provided on the output shaft 2 is brought into contact with the other conical surface 3 b of the double cone 3, and the rotation of the input shaft 1 is transmitted from the drive cone 4 to the outer ring 5 of the output shaft 2 via the double cone 3. I have.

A cone spindle 6 that rotatably supports the double cone 3 is held by a pair of supports 7 and 8 that are arranged so as to be movable in the axial direction of the input shaft 1, and moves in conjunction with one of the supports 7. The rotation of the output shaft 2 is shifted by axially moving the double cone 3 together with the cone spindle 6 by means 9.

In the upper half of FIG. 3, the rotational speed of the output shaft 2 is reduced,
The lower half of the figure shows the phases of the double cone 3 when the rotation speed of the output shaft 2 is increased.

In the continuously variable transmission as described above, the sliding contact portion of each component and the double cone 3 are rotatably supported.
Needle roller 10 installed between cone spindle 6
Supply of lubricating oil is required.

Conventional lubricating oil supply means is performed by spraying oil by rotating the outer ring 5 or the like immersed in an oil bath, or lubricating the needle roller 10 by grease.

[Problems to be solved by the invention]

However, spray lubrication and lubrication with grease have poor lubrication performance, and are effective only when the rotation speed of the double cone is low.In particular, when the double cone is rotated at high speed, there is a problem that seizure occurs with the conventional lubrication method. Therefore, for high-speed rotation, forced lubrication that secures and cools a lubricating oil film is required.

In view of the above, an object of the present invention is to provide a friction-type continuously variable transmission that can perform forced lubrication on a bearing that supports a double cone and realize high-speed rotation of the double cone. It is in.

[Means for solving the problem]

In order to solve the above-mentioned problems, this invention forms a double cone inside the hollow, incorporates a bearing using a support shaft and a roller provided in the carrier inside this hollow, and uses the double cone as a bearing with a support shaft. The main lubricating passage for supplying lubricating oil to the bearing from the carrier to the support shaft is formed, and the lubricating oil of the main lubricating passage is supplied to the supporting shaft near the roller end of the bearing. A noise hole to be supplied is provided, and an opening for draining oil is formed at both ends of the double cone.

[Action]

When the rotation of the input shaft is transmitted from the drive cone to the outer ring of the output shaft via the double cone, the double cone performs only rotation, and the lubricating oil supplied from the main lubricating passage passes through the noise hole to the bearing from the noise hole. Forced supply,
The high speed rotation of the double cone becomes possible, and the surplus of lubricating oil is discharged from the openings at both ends of the double cone, and is also used to lubricate the frictional contact surface between the input / output shaft and the double cone.

〔Example〕

Hereinafter, an embodiment of the present invention will be described with reference to FIGS. 1 and 2 of the accompanying drawings.

As shown in FIG. 1, the input shaft 11 and the output shaft 12 are coaxially arranged, a plurality of double cones 13 are provided around the input shaft 11, and the drive cone 14 provided at the tip of the input shaft 11 is doubled. The outer ring 15 provided on the output shaft 12 is brought into contact with one conical surface 13a of the cone 13 and the other conical surface 13b of the double cone 13 is provided.
, And the rotation of the input shaft 11 is transmitted to the double cone 13 by the drive cone 14, and is transmitted to the output shaft 12 by the double cone 13 and the outer ring 15.

The double cone 13 has a hollow inside along the axis, and a support shaft 17 provided on the carrier 16 is provided inside the hollow.
And a bearing 18 using rollers 19, and the double cone 13
Is rotatably supported by a support shaft 17 via a bearing 18, and rotates only without rotating.

The carrier 16 is movable along the axial direction of the input shaft 11, and the rotation of the output shaft 12 can be freely changed by the movement of the carrier 16 by a moving means (not shown).

The bearing 18 is formed by two rows of rollers 19, and an end of each roller 19 and a thrust ring 20 disposed between the rollers 19.

A main lubricating path 21 is provided for forcibly supplying lubricating oil to the bearing 18 from the carrier 16 to the support shaft 17, and the support shaft 17 is provided near the both end edges of the rolling surface of each roller 19. A noise hole at the position where the lubricating oil sent to the main lubrication path 21 is jetted out
22 is provided to actively lubricate the sliding surface on the side of the roller 19 with lubricating oil. This lubrication oil is
It also enters the rolling surface of 19, and will secondarily lubricate the rolling surface.

Openings 23 and 24 for discharging surplus lubricating oil are formed at both ends of the double cone 13, and surplus oil lubricating the bearing 18 flows out of the openings 23 and 24 to the outside, and the input / output shaft 11 , 12
Also used for lubrication of the friction contact surface of the double cone 13.
Therefore, there is no need to specially lubricate these friction contact surfaces.

As described above, by forcibly lubricating the bearing 18 supporting the double cone 13, a lubricating oil film is secured,
In addition, the cooling effect allows the double cone 13 to rotate at high speed.

FIG. 1 shows an example of use as a speed reducer,
If the input shaft 11 is used as an output shaft and the output shaft 12 is used as an input shaft, it can be used as a gearbox.
When the number of rotations is small, the thrust ring 20 can be omitted.

By the way, when the friction type continuously variable transmission is operated at a high speed or a high horsepower, the loss generated at each friction surface becomes heat, and the lubricating oil becomes high temperature. According to the experimental example, when the input shaft or output shaft reaches 60,000 rpm, the lubricating oil temperature becomes 100 ° C.
Beyond.

In such a case, the lubricating oil is vaporized or sprayed, and the inside of the case becomes high pressure and blows out from the gap.If such a state continues, a large amount of lubricating oil is lost in a short time. I will.

Therefore, as shown in FIG. 2, a pipe 32 for removing vaporized or atomized lubricating oil is connected to the upper part of the case 31 in the friction type transmission, and this pipe 32 is connected to the inlet of the liquefier 33, The outlet of the liquefier 33 is connected to the lower part of the case 31 by a return pipe 34.

Various types can be applied to the liquefier 33 depending on its performance, for example, a cooling tank, a cyclone, a porous body,
A tank containing a wire mesh, an oil mist separator, and the like can be exemplified, and a cooling tank is preferable for reducing pressure drop with a large capacity.

In order to reduce the size, a porous body, a tank containing a wire mesh, and an oil mist separator are good, but the performance is inferior to the cooling tank. A cyclone is useful when the flow velocity is high, but the apparatus becomes large.

That is, various types of the liquefier 33 can be considered, but an optimal one may be selected from the liquefaction ability, the size of the apparatus, and the like.

As described above, when the lubricating oil vaporized or atomized in the case 31 is guided to the liquefier 33 to be quickly liquefied and returned to the case 31, leakage of the lubricating oil due to an increase in the internal pressure of the friction type transmission can be achieved. This has the advantage that there is no need to lower the rated rotation speed or the rated horsepower, and it is not necessary to supply lubricating oil for a long time.

〔effect〕

As described above, according to the present invention, forced lubrication is performed on the bearing that rotatably supports the double cone in the friction type continuously variable transmission, so that the bearing is not seized due to poor lubrication, The operation which rotates a double cone at high speed becomes possible.

In addition, excess lubricating oil can be supplied to the friction contact surfaces of the input / output shaft and the double cone through openings provided at both ends of the double cone, so that special lubrication is not required for these friction contact surfaces.

[Brief description of the drawings]

1 is a longitudinal sectional view showing a main part of a friction type continuously variable transmission according to the present invention, FIG. 2 is an explanatory view of a lubricating oil recovery device, and FIG. 3 is a longitudinal section showing a conventional friction type continuously variable transmission. FIG. 11 Input shaft, 12 Output shaft, 13 Double cone, 14
... drive cone, 15 ... outer ring, 16 ... carrier, 17 ... support shaft, 18 ... bearing, 21 ... main lubrication path,
22 ... noise holes, 23, 24 ... openings.

Claims (1)

(57) [Scope of request for utility model registration] 1. A friction-type continuously variable transmission in which rotation of an input shaft is transmitted to an output shaft via a double cone, and rotation of the output shaft is shifted by moving the double cone in an axial direction of the input shaft. In the above, a double cone is formed inside the hollow, a bearing using a support shaft and a roller provided in the carrier is incorporated in the hollow, and the double cone is supported by the support shaft so that it can rotate freely via the bearing, A main lubricating passage for supplying lubricating oil to the bearing from the support shaft, and a nozzle hole for supplying the lubricating oil for the main lubricating passage near the roller end of the bearing are provided on the supporting shaft, and both ends of the double cone A friction type continuously variable transmission characterized in that an opening for draining oil is formed in the transmission.