JPS6338582B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a continuously variable transmission, and particularly to a continuously variable transmission suitable for use in driving auxiliary equipment of an internal combustion engine.

[Prior Art] In internal combustion engines such as automobile engines, a transmission device consisting of a pair of pulleys and a V-belt is used to drive auxiliary equipment such as a generator, a water pump, and a compressor for a cooler. These auxiliary machines are generally designed to provide the necessary capacity when the engine is running at low speeds, so when the engine is running at high speeds, these auxiliary machines have overcapacity, causing power loss and increased fuel consumption. For this purpose, a drive shaft connected to the engine crankshaft and a driven shaft disposed parallel to the crankshaft are connected by a pulley with a variable effective type that increases the reduction ratio as the engine rotation speed increases. It has been proposed to drive the auxiliary equipment via an auxiliary equipment driving pulley drum which is connected via a step-change transmission and connected to a driven shaft or a pulley on the driven side.

[Problems to be Solved by the Invention] However, in the above-described continuously variable transmission device, each movable flange is adjusted so that the rotational center planes of the first pulley on the driving side and the second pulley on the driven side coincide with each other. are slidably supported on each shaft by hub portions extending on opposite sides with respect to the rotational center plane of the pulley, and a mechanism for operating each movable flange is provided on the opposite side of the rotational center plane of the movable flange. Since the drive side and the driven side are arranged on the same side, the drive side and the driven side have a structure that extends in the axial direction on opposite sides with respect to the rotation center plane, and a large axial installation space is required, and it is installed in a vehicle such as an automobile. In some cases, installation space was limited, making it difficult to install.

The present invention solves the above-mentioned drawbacks by arranging the mechanism for operating each movable flange on the same side of the rotation center plane of the pulley, and stably supporting the movable flanges without protruding the hub portion from the other side of the flange. By doing so, the objective is to provide a compact continuously variable transmission device that can be installed in a small installation space and has excellent tower mountability.

[Means for Solving the Problems] The continuously variable transmission device of the present invention includes a first rotating shaft, a first pulley connected to the first rotating shaft and having a variable effective diameter, and a first pulley connected to the first rotating shaft. a second rotary shaft disposed parallel to the rotary shaft of the second rotary shaft, a second pulley with a variable effective diameter connected to the second rotary shaft, and the first pulley and the second pulley. In the continuously variable transmission device, the first pulley includes a first fixed flange connected to the first rotating shaft, and a V-belt that slides in the axial direction on the first fixed shaft. a first movable space defining a V-shaped space in which the V-belt is mounted between the first fixed flange and the first fixed flange;
a movable flange disposed on the opposite side of the V-shaped space of the first movable flange and connected between the first movable flange and the first rotating shaft; an actuation mechanism that presses the movable flange in the axial direction according to the rotational speed of the first rotating shaft, and the second pulley is arranged on the movable flange side of the first pulley with respect to the V-belt. and a second fixed flange connected to the second rotation shaft, a guide drum connected to the second rotation shaft, and a hub-shaped portion slidably fitted to the guide drum. a second movable flange that is disposed on the first fixed flange side with respect to the V-belt and defines a V-shaped space between which the V-belt is mounted and the second movable flange; an elastic body that presses the second flange in the axial direction; a plurality of protruding arms protruding on the opposite side of the pulley, and the elastic body is interposed between a flange-like spring stopper connected to the tip of the protruding arm and a fixed flange of the second pulley. It is characterized by

[Operations and Effects of the Invention] The continuously variable transmission device of the present invention has a hub-shaped portion that is slidably fitted into the guide drum of the movable flange of the second pulley, and has a cylindrical surface that protrudes from the second pulley. a plurality of protruding arms that protrude to the opposite side of the V-shaped space of the fixed flange through a plurality of holes formed corresponding to the fixed flange of the pulley, and an elastic member that presses the second movable flange in the axial direction; Since the body is interposed between the flange-like spring stopper connected to the tip of the projecting arm and the fixed flange of the second pulley,
The movable flange actuating mechanism of each pulley can be arranged on the same side of the rotation center plane, and the guide drum and the second pulley can be connected without protruding the hub-like part from the end surface of the movable flange of the second pulley. Sufficient fitting length can be ensured in the sliding portion of the movable flange with the hub-shaped part, and the movable flange of the second pulley can be stably supported, so the continuously variable transmission can be configured compactly. , it is possible to reduce the installation space in the axial direction and improve the ease of installation.

[Example] The present invention will be explained based on an embodiment shown in the drawings.

1 is a crankshaft of an automobile engine, 2 is a first pulley with a variable effective diameter attached to the end of the crankshaft 1, 3 is a rotating shaft of a water pump 30, and 4 is attached to an end of the rotating shaft 3. A second pulley 5 having a variable effective diameter and arranged on the same plane as the first pulley 2 is a transmission V-belt stretched between the first and second pulleys.

The first pulley 2 includes a fixed flange 21 fixed by a fastening means consisting of a sleeve 11 coaxially attached to the tip of the crankshaft 1, a through bolt 12, and a washer 13, and a metal fitting attached to the sleeve 11. Hub portion 2 externally fitted onto bearing 19
5A, the movable flange 25 is slidably supported in the axial direction on the sleeve 11 and forms a V-shaped space between which the V-belt 5 is attached and the fixed flange 21; Actuation mechanism 2 disposed on the side opposite to the shape space (engine side)
0, the operating mechanism 20 has a flange 15 fixed to the outer periphery of the crankshaft 1 with a key 14, a contact plate 16,
A drum-shaped retainer 22 is fixed with a fastener consisting of bolts 17 and nuts 18, an outer edge 23A of the retainer 22 is tightened and fixed to the end of the retainer 22 on the side of the fixed flange 21, and a predetermined number of governor weights 24 are attached to the side of the retainer 22. 22, and a plate spring-like disk 23 that is fixedly protruding from inside the movable flange 25. The disk 23 is connected to the tip of the hub portion 25A of the movable flange 25.

The second pulley 4 has a fixed flange 41 fastened to a hub 31 fitted to the rotating shaft 3 with bolts 32.
and the guide drum 42, a hub-shaped portion 43A that is fitted onto the sleeve-shaped metal or resin bearing 33 fitted to the guide drum 42 so as to be slidable in the axial direction, and fastened to the tip of the hub-shaped portion 43A. A movable flange 43 has a flange-like spring stopper 44 and forms a V-shaped space between which the V-belt 5 is attached and the fixed flange 41, and a spring stopper 44 at the tip of the hub-shaped portion 43A. A coiled spring 45 interposed between the fixed flange 41
It consists of

The guide drum 42 and the fixed flange 41 can be integrally manufactured by press molding, and in this case, production costs can be reduced.

46 is a pulley drum attachment flange welded to the fixed flange, and 47 is a pulley drum fastened to the flange 46.

This second pulley 4 has a fixed flange 41 with a V
The movable flange 2 of the first pulley relative to the belt 5
The movable flange 43 is placed on the V-belt 5 side.
The V-belt 5 is placed on the fixed flange 21 side of the first pulley, and is mounted so that the rotating surface of the second pulley 4 is on the same plane A--A as the rotating surface of the first pulley 2. The plane of rotation coincides with the plane A--A.

As shown in FIG. 3, the hub-shaped portion 43A of the movable flange 43 has a plurality of protruding arms 43B that are circumferentially arranged in a cylindrical shape and whose tips are bent inward.
3B project to the opposite side of the V-shaped space (toward the water pump 30) through holes 41A formed corresponding to the fixed flanges 41, respectively. The spring 45 is compressed and inserted between the fixed flange 41 and the spring stopper 44 at the tip of the hub-shaped portion 43A, and applies a spring load in the direction of the fixed flange 41 to the movable flange 43 to elastically support the movable flange 43. ing.

Therefore, it is possible to arrange both the first pulley operating mechanism 20 and the spring 45, which is the second pulley operating mechanism, on the right side of the rotation center plane AA in the drawing.

The guide drum 42 to which the metal bearing 33 is fitted serves as a guide for the movement of the movable flange 43 in the axial direction, and also serves to support the force received from the V-belt. Therefore, as in this embodiment, the guide drum 42 is fitted into the inner periphery of the base of the movable flange 43, and the hub-shaped part 43A is slidably fitted onto the outside of the guide drum 42, so that the flange base of the hub-shaped part 43A It is preferable to wear it in a supporting manner. However, it is not necessarily necessary to fix it directly to the rotating shaft 3.
The water pump 30 of the fixed flange 41 is fitted externally with the outer circumferential wall of the hub-shaped portion 43A as shown in 42' in FIG.
It may be fixed to the side, or it may be fitted to the inner circumferential wall of the hub-shaped portion 43A, but in either case, the hub-shaped portion may be fixed to the left side in the figure from the end surface of the movable flange 43 of the second pulley. A sufficient fitting length can be ensured at the sliding portion between the guide drum 42 and the hub-shaped portion 43A of the movable flange 43 without protruding the portion 43A.

In this continuously variable transmission, when the rotational speed of the crankshaft 1 is slow, the centrifugal force acting on the governor weight 24 is small, so the movable flange 25 has an operating mechanism 2.
Since a large pressing force is applied by the spring load of the disk 23 of 0, the movable flange 25 moves to the left in the figure against the tension of the V-belt 5, and as shown in FIG. The movable flange 43 of the second pulley 4 is located at a position where the effective diameter is kept large, and the movable flange 43 of the second pulley 4 is
The second pulley 4 is moved to the left in the drawing against the spring 45 by the tension of the belt 5, and the effective diameter of the second pulley 4 is at a small position, and the reduction ratio is small. When the rotational speed exceeds the set value, the disk 23 is moved by the governor weight 2.
4 deforms as shown in FIG. 2 as the centrifugal force applied to it increases, and as a result, the force that presses the movable flange 25 to the left in the figure decreases, and the tension of the V-belt 5 causes the movable flange 25 to move to the right in the figure. , the effective diameter of the first pulley 2 becomes smaller, and the spring 45 is adjusted to compensate for the accompanying loosening of the V-belt 5.
Due to this action, the movable flange 43 of the second pulley is operated in a direction to narrow the V-shaped gap B, thereby increasing the effective diameter and increasing the reduction ratio.

In addition to the coiled spring in the above embodiment, the elastic body that operates the movable flange of the second pulley may include one or more disc springs arranged in series;
An elastic body such as rubber can be used, and the elastic body should be installed between the fixed flange on the outside of the hub-shaped part and the hub-shaped part by providing a locking means for the elastic body on the outer periphery of the hub-shaped part. However, in order to reduce the influence of centrifugal force acting on the elastic body, it is preferable to attach it to the inner peripheral side of the hub-shaped portion as in the above embodiment.

Further, both the first pulley and the second pulley can be used on either the driving side or the driven side.

As described above, in the continuously variable transmission device of the present invention, the operating mechanism 20 of the first pulley 2 and the spring 45, which is the operating mechanism of the second pulley 4, are both located on one side of the rotation center plane AA. (to the right in the figure), and the movable flange 43 of the second pulley can be stably supported without the hub-shaped portion 43A protruding to the left in the figure from the end face of the movable flange 43. , the continuously variable transmission can be disposed compactly in the axial direction, and can be installed in places with small axial installation space, and is particularly effective when installed at the end of the rotating shaft. Further, when used in a transmission device for an automobile engine auxiliary machine as in the above embodiment, the fixed flange 4 of the second pulley 4
The operating mechanism of the movable flange 43 is attached to the inner circumference of the pulley drum 47 by attaching the pulley drum 47 for driving the auxiliary equipment coaxially to the pulley drum 47 and making the protruding arm 43B of the hub-shaped portion 43A protrude to the inner circumference of the pulley drum 47. It is possible to store the spring 45.

[Brief explanation of the drawing]

1 and 2 are cross-sectional views showing one embodiment of the continuously variable transmission device of the present invention, and FIG. 3 is an exploded view of the second pulley. In the figure, 2...first pulley, 4...second pulley,
5... V belt, 21, 41... Fixed flange, 2
5, 43... Movable flange, 20... Actuation mechanism, 23
...Disk, 24...Governor weight, 43A...Hub-shaped portion, 45...Spring.

Claims (1)

[Scope of Claims] 1. A first rotating shaft, a first pulley with a variable effective diameter connected to the first rotating shaft, and a first pulley disposed parallel to the first rotating shaft. a continuously variable transmission comprising: a second rotating shaft; a second pulley with a variable effective diameter connected to the second rotating shaft; and a V-belt that transmits power between the first pulley and the second pulley. In the device, the first pulley includes a first fixing flange that is quickly connected to the first rotating shaft, and a first fixing flange that is slidably attached to the first rotating shaft in the axial direction. a first movable flange forming a V-shaped space between which the V-belt is mounted;
disposed on the opposite side of the V-shaped space of the movable flange and connected between the first movable flange and the first rotating shaft and at a rotational speed of the first rotating shaft. an actuation mechanism for pressing the movable flange in the axial direction in response to the V-belt, and the second pulley is disposed on the movable flange side of the first pulley with respect to the V-belt, and a second fixed flange connected to the V-belt, a guide drum connected to the second rotating shaft, and a hub-shaped portion slidably fitted to the guide drum. a second movable flange that is disposed on the first fixed flange side and constitutes a V-shaped space between which the V-belt is attached and the second movable flange; an elastic body for pressing, and the hub-shaped portion projects to the opposite side of the V-shaped space of the second fixing flange through a plurality of holes formed corresponding to the second fixing flange. It has a plurality of protruding arms, and the elastic body has a flange-like spring stopper connected to the tip of the protruding arms and the second
A continuously variable transmission characterized by being interposed between a fixed flange of a pulley and a fixed flange. 2. The guide drum is fitted into the inner periphery of the base of the second movable flange, and the hub-shaped part of the second movable flange is slidably fitted onto the outside of the guide drum. Claim 1
Continuously variable transmission device as described in . 3. The first rotating shaft is connected to a crankshaft of an engine, and the movable flange actuating mechanism is configured to apply a pressing force to the movable flange that decreases as the rotational speed of the first rotating shaft increases. A continuously variable transmission according to claim 1, characterized in that: 4. A pulley drum for driving auxiliary equipment is attached to the fixed flange of the second pulley coaxially with the fixed flange, and the protruding arm of the hub-shaped part is protruded to the inner periphery of the pulley drum, and the elastic body is attached to the The continuously variable transmission device according to claim 1, wherein the continuously variable transmission device is disposed on the inner periphery of a pulley drum.