JPH0131065B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to a variable speed V-pulley used in a belt-type continuously variable transmission, etc., and particularly to a state in which a pair of movable conical plates facing each other are constantly pressed in a direction toward each other. By connecting the movable conical plate and rotating shaft with a roll pin with dry metal interposed on the outer periphery, slips are eliminated by equalizing the side pressure of the variable speed V-belt, and mechanical friction at the joint is eliminated. The aim is to prevent micro-movement wear as much as possible.

BACKGROUND TECHNOLOGY A conventional variable speed V-pulley of this type has a fixed conical plate and a movable conical plate facing each other so as to be able to move toward and away from the fixed conical plate, and uses a ball bearing or the like as a rolling key.

Problems to be Solved by the Invention In the above-mentioned conventional variable speed V-pulley, there is no uniformity in the left and right lateral pressure of the variable speed V belt, and the mechanical play in the axial direction due to impact, vibration, wear, etc. of the rolling key is significant.
Therefore, reliability of torque transmission cannot be expected.
In addition, there were other problems such as lack of durability.

This invention inserts a roll pin into the boss part of a movable conical plate and inserts a dry metal on the outer periphery so that it can rotate and slide freely, and the roll pin can be rolled into the rotating shaft and the guide groove of the cylindrical body to allow fine movement wear. To provide a variable speed V-pulley that completely prevents this.

Means for Solving the Problems This invention has been made with the aim of solving the above problems, and involves fitting a pair of movable conical plates to the rotating shaft so that they can freely slide, and constantly bringing them close to each other by means of a spring or the like. In the variable speed V-pulleys which are arranged opposite each other while being pressed in the direction, a roll pin is inserted into the boss part of the movable conical plate with a dry metal interposed on its outer periphery so that it can rotate and slide freely, Both ends of the roll pin are loosely fitted into guide grooves drilled in the rotating shaft and guide grooves drilled in a cylindrical body that also serves as a spring receiver fixed to the rotating shaft so that the roll pin can roll while restricting movement in the axial direction. By combining a pair of movable conical plates facing each other with respect to the rotating shaft so that they are fixed in the rotating direction and can freely slide within a certain range in the axial direction, the lateral pressure of the variable speed V-belt is equalized. Eliminating slips and allowing the dry metal to receive axial impact and vibration against the roll pin prevents as much as possible the occurrence of mechanical friction and micro-movement wear that are characteristic of rolling motion, thereby increasing the reliability of torque transmission and its durability. High,
In addition, it is an object of the present invention to provide a variable speed V-pulley whose manufacturing cost is reduced by simplifying the structure.

According to the present invention, the slight vibration generated in the axial direction of the roll pin during the speed change of the variable speed V-pulley device is absorbed by the rotation and vibration of the dry metal roll pin.
In addition, since the roll pin rolls along the guide groove when the boss portion moves, the roll pin can smoothly change speed without causing friction.

Embodiment Hereinafter, an embodiment of the variable speed V-pulley according to the present invention will be described in detail based on the drawings. The rotary shafts 2 and 2' are a pair of movable conical plates having a hole in the shaft center, and the boss portions 4 and 4' of the rotary shafts are loosely fitted to the rotary shaft 1 so that they can freely slide, and are fixed to both ends of the rotary shaft 1. and boss part 4,
A cylindrical body 8, which also serves as a spring receiver, is placed over the outer surface of 4'.
The movable conical plates 2, 2' are constantly pressed and urged toward each other by the helical springs 3, 3' interposed between the movable conical plates 2, 2' and the movable conical plates 2, 2' to be opposed to each other, thereby forming a variable speed V-pulley. Dry metals 11, 11' are interposed on the sliding surfaces of the boss parts 4, 4' with respect to the rotating shaft 1.
5, 5' are cylindrical dry metals 6, 6' interposed on the outer periphery of the insertion holes 12, 12' bored in the boss parts 4, 4' of the movable conical plates 2, 2', so that their rotation and sliding can be controlled. A roll pin is inserted through the pin so that it can move freely, and its both ends are inserted into guide grooves 7, 7' bored in the rotating shaft 1 and guide grooves 9, 9' bored in the cylindrical body 8, 8' to prevent its axial movement. A pair of movable conical plates 2, 2' that are loosely fitted together so that they can be regulated and rolled, and that are opposed to each other with respect to the rotating shaft 1, are fixed in the rotational direction and guided in the axial direction via roll pins 5, 5'. It is fitted so that it can freely slide within the grooves 7, 7' and 9, 9'. The roll pins 5, 5' are made of dry metal 6,
The diameter is slightly smaller than 6', allowing for free rotation and sliding. Also, dry metal refers to oil bearings that have lubricating properties, such as plastics and oil-impregnated alloys. The movement of the roll pins 5, 5' in the axial direction is restricted by the bottom surface of the guide grooves 7, 7' of the rotating shaft 1 and the cylindrical body 8,
Roll pins 5, 5' are attached to the bottom of the guide grooves 9, 9' of 8'.
Rotation is regulated by abutting the end face of the shaft so that its rotation is not inhibited. Reference numeral 13 denotes a variable speed V-belt hooked between a pair of movable conical plates 2, 2', which is constantly held under pressure by the pressing force in the approaching direction by the springs 3, 3' of both movable conical plates 2, 2'. There is.

dry metal 6 of the roll pins 5, 5';
6' for rotation and sliding movement and guide grooves 7, 7';
9 and 9' will be explained.

In practice, there is a distance of approximately 0.02 mm between the boss portions 4, 4' of the pair of movable conical plates 2, 2' of the V-pulley device and the rotating shaft 1.
Because there is a gap of about mm, slight vibrations occur in the boss portion relative to the rotating shaft 1, and the boss portions 4, 4' are pressed against the rotating shaft 1 in the direction in which tensile force is applied to the V-belt.
In the state shown in Fig. 1, the rotating shaft 1 and the boss parts 4, 4' are in contact at the upper part of the inner surface, and the roll pins 5, 5' are slightly protruding from the dry metal 6, 6' by a slight gap at the lower part of the inner surface, and the The roll pins 5, 5' make one reciprocation within the dry metal 5, 5' for each revolution of the pulley.

Further, both ends of the roll pins 5, 5' are connected to the guide grooves 7, 7' of the rotating shaft 1 and the cylindrical body 8, which is fixed to the rotating shaft 1.
Since the roll pins 5, 5' are restricted from moving in the axial direction by the guide grooves 9, 9' of the roll pins 8', the roll pins 5, 5' remain at the same position during rotation. Therefore, the ends of the roll pins 5, 5' roll without friction against the side surfaces of the guide grooves 9, 9', and slight vibrations are absorbed by the sliding and rotational movement within the dry metals 6, 6' of the roll pins. can do.

Also, when the pair of movable conical plates of the V-pulley device move toward and away from each other, the roll pins 5, 5' move through the guide grooves 7, 7', 9,
9'. That is, when rotating clockwise when viewed from the right side in FIG. 1, the tips of the upper roll pins 5, 5' touch the right side of the upper guide grooves 7, 7', and the tips of the lower roll pins 5, 5' touch the right side of the lower roll pins 5, 5'. rotates in contact with the left side of the guide grooves 7, 7', and when the boss parts 4, 4' move in that state, the upper and lower roll pins 5,
5' can rotate and roll separately along the upper and lower guide grooves without causing wear to the guide grooves.

In the above configuration, the pitch diameter of the variable speed V-belt 13 is changed and the pair of movable conical plates 2 face each other,
When the movable conical plates 2, 2' come into contact with and separate from each other, the rotating shaft 1 is moved by the dry lubricating action of the dry metals 11, 11' interposed on the sliding surfaces of the boss parts 4, 4' of the movable conical plates 2, 2' with the rotating shaft 1. The movable conical plates 2, 2' slide easily against the roll pins 5, 5', and the guide grooves 7, 7', 9, 9' to roll smoothly and lightly, the roll pin 5 during gear shifting operation.
Since all shocks, vibrations, friction, etc. received by the roll pins 5' are received and absorbed by the dry metals 6, 6', no mechanical friction or micro-movement wear occurs in the axial direction of the roll pins 5, 5'. Therefore, all axial movement of the rolling parts is dry lubricated and eliminated.

Effects of the Invention As explained above, this invention generates slight vibrations in the moving direction of the movable conical plate due to the rotation of the belt and the sliding gap between the sliding surface of the movable conical plate and the rotating shaft when changing the speed of the variable speed V pulley. Friction caused by minute vibrations generated in the axial direction of the roll pin can be absorbed by the rotation and sliding of the roll pin within the dry metal, and since the roll pin can roll as it moves along the guide groove, micro-movement wear between the guide groove and the roll pin can be absorbed. Therefore, since the occurrence of mechanical friction and micro-movement wear of the roll pin are prevented as much as possible by the intervention of dry metal, it is possible to obtain high speed change performance and maintain long-term stability. be. Therefore, it is effective when applied to machines and devices that require high speed changeability, high response, high rotation accuracy, etc., such as automobile transmissions and main shaft transmissions for machine tools. Furthermore, even when applied to devices that involve automatic control based on commands from etoctronics, it is extremely effective because the response is reliable.

[Brief explanation of drawings]

The drawings show an embodiment of a variable speed V-pulley according to the present invention, and FIG. 1 is a cross-sectional view when the variable-speed V-belt has a minimum pitch diameter, and FIG. 2 is a cross-sectional view when the variable-speed V-belt has a maximum pitch diameter. It is a diagram. 1... Rotating shaft, 2, 2'... Movable conical plate, 3,
3'...Spring, 4,4'...Boss part, 5,5'...
Roll pin, 6, 6'...dry metal, 7,
7'...Guide groove, 8,8'...Cylindrical body, 9,9'...
...Guide groove.

Claims (1)

[Claims] 1. A pair of movable conical plates 2, 2' are fitted onto the rotating shaft 1 so as to be able to freely slide, and are constantly pressed and biased toward each other by means of springs 3, 3', etc. In the pulley, the movable conical plate 2,
Roll pins 5, 5' are inserted into the boss parts 4, 4' of 2' with dry metals 6, 6' interposed on their outer peripheries so that they can freely rotate and slide. A guide groove 7 with both ends bored in the rotating shaft 1,
7' and guide grooves 9, 9' bored in the cylindrical body 8, 8' fixed to the rotating shaft 1, which also serves as a spring receiver, restrict the movement of the roll pins 5, 5' in the axial direction so that they can roll. A variable speed V-pulley characterized by a loose fit.