JPS63243559A - Transmission pulley for continuously variable transmission - Google Patents

Abstract

PURPOSE:To contrive reduction in cost by providing engaging sections for each inner section of both the half body of a stationary pulley and the half body of a movably pulley to the radial direction in such a way that said sections can be engaged so as to allow said half bodies of both pulleys to be rotated monolithically and by fixing an oil bearing bush between both pulley shafts. CONSTITUTION:The half body 3 of a movable pulley is engaged each other with the half body 2 of a stationary pulley by means of an engaging projection 13 and an engaging hole 14, torque transmitted thereby to the half body 3 of the movable pulley from a V-belt 9 is transmitted to the half body 2 of the stationary pulley via a damping clip 15, then is transmitted to a driven shaft 5 together with torque transmitted to the half body 2 of the stationary pulley from the V-belt 9 by way of a stationary side pulley shaft 4 and a clutch outer 11. Therefore, there is no need for any means such as a guide pin and the like which transmit torque of the half body 3 of the movable pulley to the stationary side pulley shaft 4. And a circular opening is provided between the stationary side pulley shaft 4 and a movable side pulley shaft 12 in such a way that an oil bearing bush 19 is fitted with pressure, thereby lubricating with oil saturated from the oil bearing bush 19. Therefore, there is no need for a lubricant leakage prevention member such as an '0' ring and the like, thereby enabling the provision of a simple structure with both the reduction in number of parts and the reduction in cost.

Description

[Detailed description of the invention] 11 Upright and flat top 1 The present invention relates to (1) a transmission pulley for a belt type continuously variable transmission;
In particular, the present invention relates to a transmission pulley suitable as a driven pulley of a V-belt continuously variable transmission in small vehicles such as motorcycles and scooters.

Normally, the rear wheel of a scooter is attached to the rear end of a swing unit that is pivotally supported to the vehicle body frame so as to be able to swing up and down. The engine is also mounted on this swing unit, and the engine's output is transmitted to the rear axle via a V-belt continuously variable transmission.

Figure 1 shows a variation of such a conventional scooter! In the horizontal sectional view near H*, 01 is the swing unit, 02 is the rear wheel, and 03 is the rear width axis. A rotary shaft o4, which is a driven shaft of a continuously variable transmission, is supported on the m side of the rear wheel @o3, and the rotation of the rotary shaft 04 is transmitted to the rear width shaft 03 via a tooth width 05. ing. There is a fixed pulley half on the rotation axis o4.
A driven pulley of a continuously variable transmission consisting of a movable pulley half 6 and a movable pulley half o7 is attached to the fixed pulley half 06, and the fixed pulley half 06 is rotatably supported on the rotating shaft 04 via a bearing o8. 09, and the movable pulley half 07 is integrally fixed to a movable pulley shaft 010 that is fitted onto the fixed pulley @09 so as to be slidable in the direction of one sleeve line. The movable pulley half 0γ is urged toward the fixed pulley half 06 by a spring 011.

Although not shown, a driving pulley attached to the output shaft of the engine is provided in front of the swing unit 01, and the driving pulley also has a fixed pulley half and a movable pulley half similar to the driven pulley described above. It consists of The ■belt 012 is then passed between the driving pulley and the driven pulley, and as the half of the movable pulley on the driving side moves in the axial direction due to centrifugal force according to the engine speed, the ■belt on the driving side The radius changes, and the radius on the driven side changes accordingly, so that the rotation of the engine output shaft is automatically and steplessly changed and transmitted to the illustrated driven pulley.

The rotation of the driven pulley is transmitted to the rotating shaft 04 through the fixed pulley shaft 09 and the clutch 013, but in this case,
■The rotational force transmitted from the belt 012 to the movable pulley half 07 is transmitted to the movable pulley lll1llO10 and the shaft 010.
It is transmitted to the stationary pulley @09 via the axial cam hole 014J3 and the guide pin 015 provided in the axial direction.

The space between the movable pulley shaft 010 and the fixed pulley shaft 09, which move relatively in the axial direction, and between the cam hole 014 and the guide pin 015 are lubricated with grease sealed in the space formed by the cam hole 014. A seal collar 016°, an O-ring 017, and an oil seal 018 are provided to prevent grease from leaking.

The transmission pulley of a continuously variable transmission similar to the above is, for example,
It is also shown in Japanese Patent No. 5-152846.

Method 1 In such a conventional transmission pulley, as described above, the rotational force of the movable pulley half 07 is transmitted from the movable pulley shaft 010 to the fixed pulley shaft 09 via the guide bin 015. Since this part is designed to be lubricated with grease or oil sealed in the cam hole 014, the seal collar 016 is used to prevent grease and oil leakage.
, O-ring 017. Oil seal 018 and the like are required, which increases the number of parts and costs.

The present invention was made in view of these circumstances. That is, in the present invention, a fixed pulley half and a movable pulley half that can move forward and backward with respect to the fixed pulley half are provided on the rotating shaft, and the endless V-belt is sandwiched between the opposing conical parts of the fixed and movable pulley halves. In this transmission pulley for a continuously variable transmission, a fixed pulley shaft integral with the fixed pulley half is rotatably supported on the rotating shaft, and the movable pulley half is mounted on the fixed pulley shaft. In a device in which a movable pulley shaft integral with the body is slidably fitted in the axial direction, both pulley halves rotate integrally at the radially inner portions of the fixed pulley half and the movable pulley half. Engaging portions that engage in a similar manner are provided, and an oil-impregnated bushing is inserted between the fixed pulley shaft and the movable pulley shaft.

According to the present invention, the rotational force of the movable pulley half is applied to the fixed pulley half through the engaging portions formed in the radially inner portions of the movable pulley half and the fixed pulley half and engaging with each other. Therefore, there is no need for a drive transmission member such as a guide pin between the movable pulley shaft and the fixed pulley shaft. Therefore, an oil-impregnated bushing can be easily inserted between the movable pulley shaft and the fixed pulley shaft by press-fitting, etc. The oil-impregnated bushing lubricates the movable pulley shaft and the fixed pulley shaft, and the axial direction of both nol! l Rib movements are performed extremely smoothly. Therefore, parts such as seal collars, O-rings, oil seals, etc., as in the conventional device are unnecessary.

IL hill An embodiment of the present invention is shown in FIGS. 2 to 5.

FIG. 2 is a sectional view showing a driven pulley portion of a continuously variable transmission for a scooter similar to that shown in FIG. The fixed pulley half 2 is formed, for example, by sheet metal processing of a metal plate, and has an inner peripheral portion fixed to an end of the fixed pulley shaft 4 by welding or the like. The fixed pulley shaft 4 is rotatably supported by a driven shaft 5 (rotating shaft) via a bearing 6, and
The drive plate 8 of the clutch 7 is fixed to the left end. ■The rotational force transmitted to the fixed pulley half 2 by the belt 9 is transmitted to the drive plate 8 through the fixed pulley shaft 4.
The signal is then transmitted to the driven shaft 5 via the centrifugal weight 10 and clutch outer 11. The driven shaft 5 is connected to the rear axle 26 via the gear 27 as described above.

The movable pulley half 3 is a molded product of aluminum alloy, and is formed integrally with the movable pulley shaft 12.

This movable pulley half 3 is provided with an engaging protrusion 13 protruding toward the fixed pulley half 2 on the inner peripheral side of the slope 3a that engages with the belt 9.

In this embodiment, four engaging protrusions 13 are arranged at equal intervals on the same circumference as shown in FIG. Matching hole 14
is drilled (Fig. 6). A cylindrical buffer piece 15 made of resin is fitted into each engagement hole 14, and these buffer pieces 15, 15... are connected to a connection extending in the circumferential direction as shown in FIG. are connected by pieces 16 to form an integral damping member 17, and the t! The L shock member member is applied to the side surface of the fixed pulley half 2 facing the movable pulley half 3, and each buffer piece 15 is fitted into the corresponding engagement hole 14. A locking pawl 18 is provided on a portion of the buffer piece 15 that protrudes outward from the engagement hole 14, and when the locking pawl 18 engages with the outer surface of the fixed pulley half 2, the buffer piece 15
It is designed to prevent handling from coming out of the engagement hole 14.

In this way, the movable pulley half 3 and the fixed pulley half 2 are tightly engaged with each other through the engagement protrusion 13 and the engagement hole 14, so that ■ the rotation transmitted from the belt 9 to the movable pulley half 3 The force is transmitted to the fixed pulley half 2 via the engagement protrusion 13 and the buffer piece 15, and is transferred from the belt 9 to the fixed pulley half 2
Along with the rotational force transmitted to the fixed side pulley shaft 4. as described above. It is transmitted to the target 8@5 via the drive plate 8, centrifugal weight 10, and clutch outer 11. Therefore, there is no need for a means such as a guide bin to transmit the rotational force of the movable pulley half 3 to the fixed pulley shaft 4 between the fixed pulley shaft 4 and the movable pulley shaft 12. Each of the movable pulley shafts 12 is formed on a simple cylinder. Then, an annular gap is provided between the fixed pulley shaft 4 and the movable pulley shaft 12, and an oil-impregnated bushing 19 is press-fitted into the gap.
is supported by the fixed pulley shaft 4 so as to be able to move forward and backward in the axial direction.

The surrounding surface between the movable pulley shaft 12 and the oil-impregnated bushing 19 or between the oil-impregnated bushing 19 and the stationary pulley #A4 is lubricated by the oil seeping out from the oil-impregnated bushing 19.

By performing lubrication with the oil-impregnated bush 19 in this way, there is no need for seal collars, oil seals, O-rings, etc. to prevent lubricating oil, grease, etc. from leaking to the outside, and there is no need for a seal collar, oil seal, O-ring, etc. Since there is no need to form the structure, the structure is simplified, the number of parts is reduced, and the cost is also reduced.

In addition, in this embodiment, since the movable pulley half 3 is made of an aluminum alloy with relatively good thermal conductivity, ■ the cooling performance against the heat generated by rFJ friction of the belt is good, and 1ffi is also reduced. do.

In addition, as shown in FIG. 4, the connection piece 16 of the buffer member 11 has holes 15a, 1 of each buffer member 15, 15, 1
They are arranged circumferentially along a big circle p that connects 5a... Furthermore, as is clear from FIG. 5, the end surface 15f of the buffer piece 15 on the movable pulley half 3 side
The surface 16f on the side of the movable pulley half 3 forms a continuous flat surface, and these surfaces 15f and 16f are formed parallel to the end surface 13f of the engagement protrusion 13 of the movable pulley half 3. Therefore, when engaging the engagement protrusion 13 of the movable pulley half 3 with the engagement hole 14 of the fixed pulley half 2, in other words, the hole 15a of the binding material piece 15, first, the end surface 13f of the engagement protrusion 13 is arbitrarily adjusted. The surface 16f of the connecting piece 16 at the location of
Then, by rotating the movable pulley half 3 and sliding the engagement protrusion 13 along the connection piece 16, it is inserted into the hole 15a.
In this position, insert the engaging protrusion 13 into the hole 15a.
By dropping the movable pulley half 3 and fixed half 2 into
can be assembled extremely easily.

7 to 12 show other embodiments of the invention. In this embodiment, the fixed pulley half 2 is attached to the movable pulley half 3.
An engaging recess 20 is provided opposite to the engaging recess 20.
An engaging protrusion 22 formed on the fixed pulley half 2 is engaged with the resin buffer piece 21. Buffer piece 21
As shown in FIG. 7 J5 and FIG. 10, it is formed into a bag shape that fits into the engagement recess 20, and is provided with an engagement hole 23 with a bottom having a rectangular cross section into which the engagement protrusion 22 is inserted. It is being

each! As shown in FIG. 9, the first impact piece 21 is connected by a connecting piece 24 in the same way as the buffer piece 15 to form an integrated buffer member 25. As shown in FIGS. 11 and 12, the engaging protrusion 22 is connected to the plate-shaped fixed pulley half 2.
Cut out almost a mouth shape, and use the remaining side as movable pulley half 3.
It is formed by bending and protruding towards. Each am piece 21 receives an engaging protrusion 22 in an engaging hole 23 and is fitted into a punched hole 28 of the fixed pulley half 2, and has a locking mechanism similar to the buffer piece 15 to prevent removal. It has a claw 18. The functions and effects of this embodiment are the same as those of the previous embodiment.

As described above, in the present invention, a fixed pulley half and a movable pulley half that move forward and backward relative to the fixed pulley half are provided on the rotating shaft, and the fixed and movable pulley half are opposed to each other. A transmission pulley for a continuously variable transmission that is capable of sandwiching an endless V-belt between inner screw surfaces, wherein a fixed pulley shaft integral with the fixed pulley half is rotatably supported on the rotating shaft, and the fixed pulley shaft is integral with the fixed pulley half. A movable pulley shaft integral with the movable pulley half is fitted onto the fixed pulley shaft so as to be slidable in the axial direction,
The fixed pulley half and the movable pulley half are each provided with an engaging portion that engages with each other so that the two pulley halves rotate together in a radially inner portion thereof, and the fixed pulley shaft and the movable pulley shaft are connected to each other. Since the oil-impregnated bushing is inserted between the pulley shaft and the pulley shaft, there is no need to provide rotational force transmission members such as cam holes and guide bins between the fixed pulley shaft and the movable pulley shaft.
In this way, the oil-impregnated bushing that can be inserted between the shafts of both pulleys enables lubrication between the shafts of both pulleys with a simple structure, and also eliminates the need for lubricant leakage prevention members such as seal collars, O-rings, and oil seals. First, it is possible to reduce the number of parts and reduce costs.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing the driven pulley side of a conventional continuously variable transmission, FIG. 2 is a sectional view showing the driven pulley side of a continuously variable transmission according to an embodiment of the present invention, and FIG. 3 is a sectional view showing the driven pulley side of a continuously variable transmission according to an embodiment of the present invention. FIG. 4 is a front view of the movable pulley half in the example, and FIG. 5 is a front view of the same buffer member.
6 is a front view of the fixed pulley half, FIG. 7 is a drawing similar to FIG. 2 showing another embodiment of the present invention, and FIG. 8 is a front view of the movable pulley half in the same embodiment, FIG. 9 is a front view of the same buffer member, and
0 is a sectional view taken along the line X-X in FIG. 9, FIG. 11 is a front view of the fixed pulley half in the same embodiment, and FIG.
FIG. 2 is a cross-sectional view taken along the line V[-Vl in FIG. 1; 1... Driven pulley, 2... Fixed pulley half, 3...
・Movable pulley half, 4... Fixed side pulley shaft, 5...
Driven shaft, 6... Bearing, 7... Clutch, 8... Drive plate, 9... V-belt, 10... Centrifugal weight, 1
1...Cludge outer, 12...Movable pulley shaft,
13... Engagement protrusion, 14... Engagement hole, 15... Buffer piece, 16... Connection piece, 17... Buffer member, 18
... Locking claw, 19 ... Oil-impregnated bushing, 20 ... Engagement recess, 21 ... Buffer piece, 22 ... Engagement projection piece, 2
3... Engagement hole, 24... Connection piece, 25... Buffer member, 26... Rear axle, 27... Gear, 28... Punching hole.

Claims (1)

[Claims] A fixed pulley half and a movable pulley half that can move forward and backward relative to the fixed pulley half are provided on the rotating shaft, and an endless V-belt can be held between the opposing conical surfaces of the fixed and movable pulley halves. A transmission pulley for a step-change transmission, wherein a fixed pulley shaft integral with the fixed pulley half is rotatably supported on the rotating shaft, and a movable pulley shaft integral with the movable pulley half is supported on the fixed pulley shaft. In a device in which the side pulley shafts are slidably fitted in the axial direction, the fixed pulley half and the movable pulley half engage with each other at radially inner portions so that both pulley halves rotate integrally. A transmission pulley for a continuously variable transmission, characterized in that engaging portions are provided, and an oil-impregnated bush is inserted between the fixed pulley shaft and the movable pulley shaft.