JPH0632815U - Pulley structure of continuously variable transmission - Google Patents

Abstract

(57) [Summary] [Purpose] The objective is to reduce the sliding resistance when the movable pulley moves. [Structure] A sliding layer 2a made of a material having a low coefficient of friction is formed on the outer circumference of a tooth portion 2 formed on the outer circumference of a rotary shaft 1, and the sliding layer 2a and the groove portion 7a of a movable pulley 6 are brought into contact with each other. Reduce the sliding resistance when the movable pulley moves.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

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

[0002]

[Prior art and its problems]

 Conventionally, in a continuously variable transmission, a belt is looped between a fixed pulley and a movable pulley, and the movable pulley is moved to change the distance between the fixed pulleys for gear shifting. Although the structure is such that it can be moved, if the sliding resistance is large during this movement, it becomes difficult to change gears, and seizure of the gear change motor etc. occurs.

[0003]

[Means for Solving the Problems]

 The present invention has been devised in view of the above conventional problems, and an object thereof is not to provide a pulley structure that can reduce the sliding resistance of a movable pulley as much as possible, and the gist thereof is fixed to a rotating shaft. In a continuously variable transmission equipped with a fixed pulley and a movable pulley that is slidably movable along the rotation axis in a direction in which the fixed pulley is moved toward and away from the fixed pulley, the movable pulley is provided on the opposite side to the fixed pulley. A slide cylinder portion having a plurality of groove portions in the rotation axis direction on the inner periphery at a predetermined interval and externally mounted on the rotation shaft is provided, and a plurality of groove portions fitted in the groove portions are provided on the outer periphery of the rotation shaft. That is, the tooth portions are formed at predetermined intervals, and a sliding layer made of a material having a low coefficient of friction is formed on the outer peripheral side of each tooth portion.

[0004]

[Action]

 A sliding layer made of a material with a low coefficient of friction is formed on the outer circumference of the teeth on the rotating shaft side.Therefore, when the groove formed on the movable pulley slides along the teeth, it slides. The dynamic resistance is reduced and the movable pulley moves smoothly.

[0005]

Embodiment An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a half cross-sectional view of a fixed pulley and a movable pulley that constitute a pulley of a continuously variable transmission, and FIG. 2 is a cross-sectional view taken along the line AA in FIG. In the figure, a rotary pulley 1 rotated by an engine is integrally formed with a fixed pulley 3 protruding outward, and a step portion 1a formed on the outer periphery of the rotary shaft 1 is outwardly extended. A tooth portion 2 is formed in a protruding shape, and a plurality of tooth portions 2 are provided on the outer periphery of the rotary shaft 1 at predetermined intervals as shown in FIG. In addition, a slide cylinder portion 7 is integrally formed on the opposite side of the fixed pulley 3 of the movable pulley 6 that is movable in a direction away from and in contact with the fixed pulley 3, and the inner peripheral surface of the slide cylinder portion 7 includes A plurality of groove portions 7a into which the tooth portions 2, 2, 2 are fitted are formed at predetermined intervals, and when the movable pulley 6 slides along the rotary shaft 1, each tooth portion 2 and the groove portion 7a are formed. Are in contact with each other. In the figure, reference numeral 8 is a belt mounted between the fixed pulley 3 and the movable pulley 6, and reference numerals 4 and 5 are bearings for supporting the rotary shaft 1.

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

Next, FIG. 4 shows a second embodiment. In FIG. 4, instead of the sliding layer 2a coated, a recessed fitting portion 2b is formed on the outer periphery of each tooth 2. The tip member 2c, which has been formed and has a substantially U-shaped cross section, is adhered to the fitting portion 2b with an adhesive or the like, and the outer periphery of the tooth portion 2 is made of the tip member 2c having a low friction coefficient and sliding. It forms a layer. As the material of the chip material 2c, the same material as that of the sliding layer 2a can be used.

[0008]

[Effect of device]

 The present invention provides a continuously variable transmission including a fixed pulley fixed to a rotary shaft and a movable pulley slidably movable along the rotary shaft in a direction in which the fixed pulley is separated from and in contact with the fixed pulley. On the side opposite to the fixed pulley of the movable pulley, there is provided a slide cylinder part having a plurality of groove parts in the rotation axis direction at a predetermined interval on the inner circumference and externally mounted on the rotation shaft, and on the outer circumference of the rotation shaft, A plurality of teeth that fit into the grooves are formed at predetermined intervals, and a sliding layer made of a material with a low coefficient of friction is formed on the outer peripheral side of each of the teeth, so that it is movable. When the pulley moves, the sliding layer comes into contact with the groove, and the friction coefficient of the sliding layer is low, so the sliding resistance when the movable pulley moves is greatly reduced, and the movement of the movable pulley is smooth and good. Becomes

[Brief description of drawings]

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

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

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

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

[Explanation of symbols]

 1 rotating shaft 2 teeth 2a sliding layer 2b fitting 2c chip material 3 fixed pulley 6 movable pulley 7 slide cylinder 7a groove 8 belt

Claims (1)

[Scope of utility model registration request] 1. A continuously variable transmission equipped with a fixed pulley fixed to a rotary shaft and a movable pulley slidably movable along the rotary shaft in a direction in which the fixed pulley is separated from and in contact with the fixed pulley. On the side opposite to the fixed pulley, there is provided a slide cylinder portion having a plurality of groove portions in the rotation axis direction on the inner periphery at predetermined intervals and which is externally mounted on the rotation shaft, and each groove portion is provided on the outer periphery of the rotation shaft. A continuously variable transmission characterized in that a plurality of tooth portions to be fitted therein are formed at predetermined intervals, and a sliding layer made of a material having a low friction coefficient is formed on the outer peripheral side of each tooth portion. Machine pulley structure.