JPS58109754A - Oil sealing device for v-belt stepless speed changer - Google Patents

Abstract

PURPOSE:To miniaturize an oil sealing device for a V-belt type stepless speed changer by covering a slot on a mobile sheave shaft movably engaged with a fixed sheave shaft with a seal member and an outer cylinder. CONSTITUTION:A mobile sheave shaft 104 having a mobile sheave 106 is fitted into a fixed sheave shaft 92 having a fixed sheave 94 and a pin 110 mounted on a fixed sheave shaft 96 is engaged with a slot 108 of the mobile sheave shaft 104 whereby the mobile sheave shaft 104 is integrated slidably on the fixed sheave shaft 92. The slot 108 of the mobile sheave shaft 108 is oil sealed with seals 116 and 118 and an outer cylinder 114 to eliminate leakage of a lubricant.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an oil sealing device that prevents lubricating oil from scattering in a movable sheave of a V-belt continuously variable transmission.

In a V-belt continuously variable transmission, the V-belt is wound between the opposing conical circumferential surfaces of a fixed sheave and a movable sheave, each having a conical circumferential surface, and the effective radius of the V-belt wrapping is adjusted by changing the spacing between the two sheaves. Shift the gear by changing the In this case, the movable sheave must not only slide in the axial direction of the fixed sheave shaft J: to which the fixed sheave is fixed, but also must rotate integrally with the fixed sheave. That is, the mechanism for transmitting rotation to the 0T movable sheave must simultaneously allow the movable sheave to slide smoothly in the axial direction.

FIG. 1 is a cross-sectional view of the main part of a conventional device, and in this figure, reference numeral l
O is a fixed sheave fixed to the fixed sheave shaft 12, and 14 is a movable sheave fixed to the movable sheave shaft 16. The movable sheave shaft 16 is slidably held on the fixed sheave shaft 12. That is, the oT#lJJ sheave shaft 16 is formed with a long hole 18 in the axial direction 6, and the fixed sheave shaft 12
A bottle 20 is protruded from the hole 18, and a roller 22 attached to the bottle 20 rolls on the inner surface of the elongated hole 18. Therefore, the inside of the elongated hole 18 is coated with a suitable amount of lubricating oil. 24 is a clutch boss that supports the fixed sheave shaft 12; 26 is a clutch boss 24 fixed to the clutch boss 24;
28 is a clutch plate fixed to the fixed sheave shaft 12 so as to be close to the inside of the clutch housing 26.

Reference numeral 30 denotes an outer cylinder attached to the outer periphery of the movable sheave shaft 16, and this outer cylinder 30 also serves as a spring seat for a spring 32 that presses the movable sheave 14 toward the fixed sheave 12. Two annular grooves are formed on the outer periphery of the movable sheave shaft 16 so as to sandwich the elongated hole 18, and O-rings 34 and 36 are respectively installed in these grooves. That is, these O-rings 34.
36 and outward 30, the elongated hole 18 is sealed. Further, 38 and 40 are seals installed on the inner edges of both ends of the movable sheave shaft 16.

As described above, in the conventional device, the long hole 18 was oil-tightly sealed using the O-ring 34°36, so the O-ring 34
．． In order to prevent the grooves 36 and seals 38 and 40 from overlapping, it was necessary to lengthen the movable sheave shaft 16.

It is also conceivable to arrange the grooves of the cut O-rings 34, 36 on the radially outer side of the seals 38, 40, but in this case the outer diameter of the movable sheave shaft 16 becomes larger. In any case O
When the rings 38, 40 are used, the movable sheave shaft 16 becomes large, and therefore the entire device becomes thick.

This invention was made in view of the above circumstances, and an object thereof is to provide an oil sealing device suitable for downsizing of a V-belt continuously variable transmission.

This invention includes a movable sheave shaft slidably held on a fixed sheave shaft, an axially long elongated hole formed in the movable sheave shaft, and a movable sheave shaft protruding from the fixed sheave shaft and engaging in the elongated hole. a bin, a fixed sheave and a movable sheave fixed to the fixed sheave shaft and the movable sheave shaft, respectively;
Item 11: In the V-belt continuously variable transmission, the V-belt continuously variable transmission is attached to the moving sheave shaft and has an outer surface that covers the elongated hole described in 5 above, wherein the inner circumferential surface of the outer cylinder is provided with a seal that is in close contact with the outer circumferential surface of the movable sheave shaft. The members are fixed together, and the sealing member and the outer cylinder cover the elongated hole in an oil-tight manner.

The present invention will be described in detail below based on the illustrated embodiments.

FIG. 2 is a partially sectional plan view of an embodiment of the present invention, and FIG. 3 is a sectional view of the driven sheave. In Figure 2, 5
0 is a drive side sheave, and this drive side sheave 50 includes a fixed sheave 54 fixed to the tip of the input shaft 52, and a fixed sheave 54 fixed to the tip of the input shaft 52.
2, a drive plate 58 that transmits the rotation of the human-powered shaft 52 to the movable sheave 56, and a ball 62 held between the drive plate 58 and a cam surface 60 on the movable sheave 56 side. Equipped with As the rotational speed of the input shaft 50 increases, the ball 62 moves the movable sheave 56 to the fixed sheave 5.
(2) Increase the winding radius of the bell seat 64.

70 is a driven side sheave. In Fig. 3, 72 is a case, 74 is an output shaft held in this case 72, and 76
is a clutch boss, 78 is a small gear, and clutch boss 7
6 and the small gear 78 are connected to each other by a dog clutch 80 and are rotatably held on the output shaft 74. 82.8
4 is a bearing interposed between this clutch boss 76, the small tooth @i78, and the output shaft, and 86 is a connecting portion between the two, which is connected to the inner case 8.
This is a bearing that holds the position at 8. 90 is a clutch housing fixed to one end of the clutch boss 76; 92 is a fixed sheave shaft held by the clutch boss 76 so as to be located between the clutch housing 90 and the bearing 86; A fixed sheave 94 is fixed. 96.98 is a bearing of this fixed sheave shaft 92. A clutch plate 100 is fixed to the end of the fixed sheave shaft 92 on the clutch housing 90 side, and a clutch weight 102 is attached to this clutch brake 100, and these and the clutch housing 90 form a known automatic centrifugal clutch. It is formed.

A movable sheave shaft 104 is slidably fitted onto the outer periphery of the fixed sheave shaft 92.

The fixed sheave 94 (two opposing movable sheaves 106 are fixed to the movable sheave shaft 104, and both sheaves 94, 10
The belt 64 is wound around the gap having a V-shaped cross section formed between the belts 6 and 6. pi]' A long hole 108 that is long in the axial direction is formed in the movable sheave shaft 104, and a pin 110 that projects from the fixed sheave shaft 92 is engaged in this long hole 108. A roller 112 is attached to this pin 110, and this roller 112 rolls on the inner surface of the elongated hole 108.

114 is an outer cylinder attached to the outer periphery of the movable sheave shaft 104. One end of the outer cylinder 114 is bent into a flange shape, and rubber seal members 116 and 118 are fixed by baking to the inner surface near the seven flange portions and the other openings. The seal members 116 and 118 are in close contact with the movable sheave shaft 104 so as to seal the elongated hole 108 when the outer cylinder 114 is attached to the movable sheave shaft 104. 120.1
22 is a seal attached to both ends of the movable sheave shaft 104. 124 is a compression coil spring, one end of which presses the clutch plate lOO through the spring seat 126, and the other end which is bent, presses the movable sheave shaft 104 through the flange portion of the outer cylinder 114, respectively. That is, this spring 124 is
It has the effect of pressing the movable sheave 106 toward the fixed sheave 94. As is clear from FIG. 3, the spring seat 126 is formed to surround the outside of the spring 124. Therefore, the lubricating oil applied near the movable sheave shaft 104 does not scatter onto the automatic centrifugal clutch or each sheave 94, 106, etc.

128 is a shaft rotatably supported by the case 72 and the inner case 88; 130 is a gear fixed to this shaft 128; rotation of the pinion 78 is controlled by the gear 130, the shaft 128, and a small The speed is reduced and transmitted to the output shaft 74 via a gear 132 and a gear 134 fixed to the output shaft 74.

Next, the operation of this embodiment will be explained. When the human power shaft 52 rotates at a low speed, the winding radius of the V-pel 164 of the drive side sheave 50 is small, and the movable sheave 106 approaches the fixed sheave 94 side by the spring 124, so that the winding radius of the belt 64 of the driven side sheave 70 is small. growing.

In other words, the reduction ratio is large.

As the rotational speed of the human power shaft 52 increases, the bolt 62 increases the radius of the V-belt seat 64 of the drive pulley 50. Accordingly, the movable sheave 106 of the driven sheave 70 is
The movable sheave shaft 104 is pushed to the left in the figure, and the movable sheave shaft 104 is
08 are guided by rollers 112 and slide in the same direction.

At this time, spring 124 is compressed. As a result, the winding radius of the V-pel 164 of the driven sheave 70 decreases, and the reduction ratio decreases.

In this way, the sheaves 94 and 106 rotate at a predetermined reduction ratio, and when the rotation of the fixed sheave shaft 92 reaches a predetermined speed or higher, the automatic centrifugal clutch is engaged, and the rotation of the fixed sheave shaft 92 is controlled by the clutch plate 100, clutch weight 10
2, Clutch/1 Uzing 901, Clutch Boss 76,
Dog clutch 80, small gear 78, gears 130, 132
, 134 to the output shaft 74.

An appropriate amount of lubricating oil is applied to the roller 112 in the elongated hole 108, and since this elongated hole 108 is oil-tight (sealed) by the outer cylinder 4114 and the seal members 116 and 118, this lubricating oil is not applied. But automatic clutch and sheave 94.1
There is no possibility that it will scatter on the friction surface of 06.

In this embodiment, the seal members 116 and 118 are attached to the outer cylinder 114.
Although the inner surface was fixed by baking, a strong adhesive may also be used.

As described above, this invention fixes a sealing member that closely contacts the outer opening surface of the movable sheave axis to the inner peripheral surface of the outer cylinder that covers the long hole of the 0T moving sheave, and seals the long hole with oil between the sealing member and the outer cylinder. Since the sheave is densely covered, the overall length and outer diameter of the movable sheave shaft can be reduced compared to conventional devices that use O-rings. In other words, in conventional equipment, in order to avoid overlapping the O-ring mounting groove and the seal at the end of the movable sheave shaft,
Whereas it was necessary to make the movable sheave shaft longer or thicker, this invention ('''-) eliminates the need to make the movable sheave shaft longer and thicker, making it possible to downsize the movable sheave shaft and the entire device. .

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a main part of a conventional device, FIG. 2 is an overall partially sectional view of an embodiment of the present invention, and FIG. 3 is a sectional view of a driven sheave. 92...Fixed sheave shaft, 94...Fixed sheave, 10
4...Movable sheave shaft, 106...Movable sheave, 108
... Long hole, 110 ... Pin, 114 ... Outer cylinder, 11
6.118... Seal member. Patent Applicant Yamaha Motor Co., Ltd. Agent Patent Attorney Yama 1) Yu Fumi Figure 1

Claims (1)

[Claims] a movable sheave shaft slidably held on a fixed sheave shaft; an axially long elongated hole formed in the movable sheave shaft; a bottle protruding from the fixed sheave shaft and engaging in the elongated hole; A V comprising a fixed sheave and a movable sheave fixed to the fixed sheave shaft and the OT moving sheave shaft, respectively, and an outer cylinder attached to the movable sheave shaft and covering the elongated hole.
In the continuously variable belt transmission, a seal member is fixed to the inner circumferential surface of the wing portion, the sealing member being in close contact with the outer circumferential surface of the movable sheave shaft;
An oil sealing device for a V-belt continuously variable transmission, characterized in that the long hole is oil-tightly covered by the seal member and the outer cylinder.