JP2601654Y2 - Pulley structure of continuously variable transmission - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION The present invention relates to an improvement of a pulley structure in a continuously variable transmission.

[0002]

2. Description of the Related Art Conventionally, in a continuously variable transmission, a belt is mounted between a fixed pulley and a movable pulley, and the movable pulley is moved to change the interval between the fixed pulleys. The movable pulley has a structure capable of moving with respect to the rotation axis. However, if the sliding resistance is large during this movement, there is a problem in that shifting becomes difficult, and burn-in of a shifting motor or the like occurs.

[0003]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems, and has as its object to provide a pulley structure capable of minimizing the sliding resistance of a movable pulley. The gist of the present invention is to provide a continuously variable transmission including a fixed pulley fixed to a rotating shaft and a movable pulley slidable along the rotating shaft in a direction away from and fixed to the fixed pulley. On the side opposite to the fixed pulley, a slide cylinder portion provided with a plurality of grooves in the rotation axis direction at predetermined intervals on the inner periphery and provided on the rotation shaft is provided. Are formed at predetermined intervals, and a concave fitting portion is formed on the outer peripheral side of each tooth portion.
Chi consisting low coefficient of friction formed in a shape of a plane substantially U material
That is, the cap material is bonded and fitted .

[0004]

[Action] on the outer periphery of the teeth of the rotary shaft side, since the chip material made of low coefficient of friction material is fitted, when the grooves are formed in the movable pulley along the teeth slide moves In addition, the sliding resistance is reduced, and the movable pulley moves smoothly.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a half sectional view of the periphery of a fixed pulley and a movable pulley constituting a pulley of a continuously variable transmission, and FIG. 2 is a sectional view taken along line AA in FIG. In the figure, a fixed pulley 3 is integrally formed on a rotating shaft 1 that is rotated by an engine and protrudes outward, and a stepped portion 1a formed on the outer periphery of the rotating shaft 1 is outwardly formed. Tooth 2 protruding
The teeth 2 are provided at predetermined intervals on the outer periphery of the rotating shaft 1 as shown in FIG.
A slide cylinder 7 is integrally formed on the movable pulley 6, which is movable in the direction of moving away from and fixed to the fixed pulley 3, on a side opposite to the fixed pulley 3. A plurality of grooves 7a into which the teeth 2, 2, 2 are fitted are formed at predetermined intervals. When the movable pulley 6 slides along the rotating shaft 1, the teeth 2 and the grooves 7a are formed. It will be in contact. In the drawing, reference numeral 8 denotes a belt mounted between the fixed pulley 3 and the movable pulley 6, and reference numerals 4 and 5 denote bearings for supporting the rotating shaft 1.

As shown in the enlarged view of FIG. 3, each tooth portion 2 in this embodiment has a sliding layer 2a formed on the outer periphery thereof. It is formed by coating a material with low coefficient of friction on
As the material to be coated, for example, a material obtained by mixing ethylene tetrafluoride (PTFE), polyamide imide (PAI), and molybdenum disulfide (MOS2), or polybenzimidazole (PBI), boron nitride (BN), and graphite A material mixed with (C) is used. Since the sliding layer 2a having a low coefficient of friction is formed as described above, when the movable pulley 6 moves, the sliding cylinder 7
, The sliding resistance with respect to the rotating shaft 1 is reduced, and a smooth moving state is obtained.

Next, FIG. 4 shows a second embodiment. In FIG. 4, the sliding layer 2a to be coated is described.
Instead, a concave fitting portion 2b is formed on the outer periphery of each tooth portion 2, and a chip material 2c formed in a substantially U-shaped cross section is bonded to the fitting portion 2b with an adhesive or the like. A sliding layer made of a chip material 2c having a low friction coefficient is formed on the outer periphery of the tooth portion 2. As the material of the tip material 2c, the same material as that of the sliding layer 2a can be used.

[0008]

According to the present invention, there is provided a continuously variable transmission having a fixed pulley fixed to a rotating shaft and a movable pulley slidably movable along the rotating shaft in a direction of coming and leaving the fixed pulley. On the opposite side of the movable pulley from the fixed pulley, there is provided a slide cylinder portion having a plurality of grooves in the rotation axis direction at predetermined intervals on an inner periphery and being provided on the rotation shaft, and an outer periphery of the rotation shaft. A plurality of teeth fitted into the respective grooves are formed at predetermined intervals, and a concave fitting part is formed on the outer peripheral side of each tooth , and a cross section is formed in the fitting part.
A chip made of a material with a low coefficient of friction formed in a substantially U shape
By flop member is fitted adhesion, becomes the chip member and the groove is in contact during movement of the movable pulley, the chip
Since the friction coefficient of the material is low, the sliding resistance during the movement of the movable pulley is extremely reduced, and the movement of the movable pulley becomes smooth and good.

[Brief description of the drawings]

FIG. 1 is a half sectional configuration diagram around a fixed pulley and a movable pulley.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is an enlarged sectional configuration diagram of a tooth portion.

FIG. 4 is an exploded perspective view of a tooth portion and a tip material according to a second embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Rotating shaft 2 Tooth part 2a Sliding layer 2b Fitting part 2c Tip material 3 Fixed pulley 6 Movable pulley 7 Slide cylinder part 7a Groove part 8 Belt

Claims (1)

(57) [Scope of request for utility model registration] 1. A continuously variable transmission comprising: a fixed pulley fixed to a rotating shaft; and a movable pulley slidably movable along the rotating shaft in a direction away from and fixed to the fixed pulley. On the side opposite to the fixed pulley, there is provided a slide cylinder portion that has a plurality of grooves in the direction of the rotation axis at predetermined intervals on the inner periphery and is externally mounted on the rotation shaft. A plurality of teeth fitted into the inside are formed at predetermined intervals, and a concave is formed on the outer peripheral side of each tooth.
Is formed, and a substantially U-shaped cross section is formed
Chip material made of material with low coefficient of friction formed on
A pulley structure for a continuously variable transmission, wherein the pulley structure is fitted .