JP2003240080A - Friction roller type transmission - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To further improve a lubricating condition and a service life. <P>SOLUTION: In this friction roller type transmission B, rollers 7, 8 and 9 having smooth surfaces are strongly pressed to a shaft 6 and an outer ring 5, and a lubricating oil film is interposed between them, so as to transmit a power. A housing 2 is equipped with a grease sealing hole 20 for supplying grease to the rollers 7 and 9. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a friction roller type transmission having a further improved lubrication condition and life.

[0002]

2. Description of the Related Art Traction drive type transmissions have been developed for various industrial applications because they are quiet and smooth.
Furthermore, in recent years, attempts have been made to apply it to personal use such as automobiles and bicycles, and it is drawing attention as a next-generation power transmission system.

Unlike a gear transmission, a traction drive type transmission strongly presses at least two rotating bodies having smooth surfaces, and a lubricating oil film (for example, an EHL oil film) is interposed between them to drive power. It is a mechanism for transmission, and its basic formula is expressed by a simple friction formula Ft = μ · Fc (Ft: traction force). Where Fc
Is called pressing force, and various methods have been developed to generate this.

As one of the traction drive type transmissions, there is a friction roller type transmission utilizing a wedge action (hereinafter referred to as a wedge roller type transmission).

The wedge roller type transmission is provided with a low speed side shaft (outer ring side) and a high speed side shaft, and when the low speed side shaft (outer ring side) is the output side, it acts as a speed reducer, while it operates at a low speed. When the side shaft (outer ring side) is on the input side, it acts as a speed increaser.

Further, some wedge roller type transmissions have a one-way clutch function that transmits torque during forward rotation, but does not transmit torque during reverse rotation, and there are some types of forward and reverse transmissions. Some types are capable of transmitting torque during both rotations.

In the wedge roller type transmission, once the transmission is assembled, it is necessary to disassemble the transmission once in order to reseal the grease, and even if the transmission is used without adding grease, Functionally, there is no problem with lubrication and life.

[0008]

However, when a large amount of grease has flowed from the high speed side shaft to the outer ring side after a long period of use, or when the grease has been operated under severe conditions for a long period of time, the grease must be reused. If grease can be filled, it is expected that the lubrication condition and life will be further improved.

The present invention has been made in view of the above-mentioned circumstances, and an object thereof is to provide a friction roller type transmission having a further improved lubrication state and life.

[0010]

In order to achieve the above object, a friction roller type transmission according to claim 1 of the present invention strongly presses at least two rollers having a smooth surface between them. In a friction roller type transmission that transmits power through a lubricating oil film, a housing is provided with a grease sealing hole for supplying grease to the roller.

A friction roller type transmission according to a second aspect of the present invention has an outer peripheral surface as a first cylindrical surface, a center roller rotating in a housing, and an inner peripheral surface as a second cylindrical surface. An outer ring which is provided around the inside of the housing so as to be rotatable relative to the center roller and the housing; a rotating shaft which is concentric with the outer ring and whose one end is connected to the outer ring; and the first cylindrical surface. A plurality of support shafts arranged in parallel with the rollers and rotatably supported by the support shafts in an annular space between the second cylindrical surface and the third cylindrical surface. A plurality of intermediate rollers, and by making the center of the center roller and the center of the rotating shaft and the outer ring eccentric, the width dimension of the annular space is made unequal in the circumferential direction, Out of the middle roller At least one intermediate roller is movably supported at least in the circumferential direction of the annular space to be a movable roller, and the other intermediate rollers are used as guide rollers, and the central roller and the outer ring are moved in the predetermined direction. When rotating at a speed ratio commensurate with the speed ratio between the central roller and the rotary shaft, a friction roller speed change utilizing a wedge action for moving the intermediate roller serving as the movable roller to a narrow portion of the annular space. In the machine, the housing is provided with a grease sealing hole for supplying grease to the roller.

Further, in the friction roller type transmission of the present invention,
It is desirable to further include a cover member for closing the grease sealing hole.

As described above, according to the present invention, since the housing is provided with the grease sealing hole for supplying the grease to the rollers, when the transmission is used, the grease is replenished without disassembling the transmission. Therefore, the lubrication state and life can be further improved.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A friction roller type transmission according to an embodiment of the present invention will be described below with reference to the drawings.

(First Embodiment) FIG. 1 shows a first embodiment of the present invention.
FIG. 3 is a cross-sectional view of the wedge roller type transmission according to the embodiment. FIG. 2 is a sectional view taken along the line AA of FIG. FIG. 3 is a diagram for explaining the operation of the wedge roller type transmission.

In the present embodiment, the wedge roller type transmission B acts as a speed reducer with the low speed side shaft 3 (outer ring side) as the output side. However, in the present invention, the low speed side shaft 3
It can also be applied to a gearbox with the (outer ring side) as the input side.

Further, the wedge roller type transmission B has a one-way clutch function of transmitting torque during forward rotation, but idling and not transmitting torque during reverse rotation.

In FIGS. 1 and 2, a housing 2 as a partition plate is fixed to a housing 1 having a substantially triangular cross section. A low-speed side shaft 3 is rotatably supported in the housing 1, and a disc-shaped member 4 is provided inside the low-speed side shaft 3, and an outer ring 5 is attached to an outer edge portion of the disc-shaped member 4. There is.

A high speed side shaft 6 which is a central roller is eccentrically (offset) with respect to the low speed side shaft 3 and the outer ring 5 and is rotatably provided in the housing 2.

As shown in FIG. 2, between the outer ring 5 and the high speed side shaft 6, there are a large diameter guide roller 7 which is an intermediate roller, a small diameter guide roller 8 which is an intermediate roller, and an intermediate roller. A movable roller 9 that moves when transmitting a certain torque is interposed.

The support shaft 10 that rotatably supports the movable roller 9 via a needle bearing composed of a cage and a roller,
As shown in FIG. 3, the high-speed side shaft 6 and the outer ring 5 are configured so as to be movable in a direction in which a "wedge" is generated, and the spring 11 (see FIG. 2) is formed in the direction in which the "wedge" is generated. ).

As a result, as shown in FIG. 3, at the time of normal rotation, the movable roller 9 moves in the direction in which a "wedge" is generated between the high speed side shaft 6 and the outer ring 5 to generate a pressing force Fc. Traction force is generated by this Fc, and torque can be transmitted.

On the other hand, at the time of reverse rotation, the movable roller 9 moves in the direction away from the "wedge", the pressing force Fc becomes 0, the high speed side shaft 6 idles, and torque cannot be transmitted.

In this embodiment, the housing 2 is provided with a grease sealing hole 20 for supplying grease to the rollers 7, 8, 9 and the outer ring 5 and the high speed side shaft 6.
Therefore, when the wedge roller transmission B is used, the grease can be replenished without disassembling the wedge roller transmission B, so that the lubrication state and the life can be further improved.

Further, a cover member 21 for closing the grease sealing hole 20 is provided. The cover member 21 is, for example, a threaded one, a rubber cap with a crimp, or the like. This can prevent foreign matter such as dust from entering from the outside.

Further, the position of the grease filling hole 20 is a portion indicated by a black circle by the symbol X in FIG. 2, and grease is filled in the gaps between the rollers 7, 8, 9 and the outer ring 5 and the high speed side shaft 6, Spread by the rotation of each. At this time, since the grease easily flows outward, the closer it is to the high speed side shaft 6, the more effective it is. The grease is sealed in the axial direction in the vicinity of the centers of the rollers 7, 8 and 9 and around the tip of the injection needle of the syringe 22 described in the second embodiment later. In addition, the gap volume of the wedge roller type transmission B is sufficiently secured so that grease can be filled later. (Second Embodiment) FIG. 4 is a sectional view of a wedge roller type transmission according to a second embodiment of the present invention. FIG. 5 is a sectional view taken along the line AA of FIG. The difference between the second embodiment and the first embodiment is that the first embodiment has a one-way clutch function, whereas in the second embodiment, the torque is increased during both forward and reverse rotations. It can be communicated. The same components as those in the first embodiment are designated by the same reference numerals and the description thereof will be omitted.

In the present embodiment, the wedge roller type transmission B acts as a speed reducer with the low speed side shaft 3 (outer ring side) as the output side. However, in the present invention, the low speed side shaft 3
It can also be applied to a gearbox with the (outer ring side) as the input side.

In FIGS. 4 and 5, a housing 2 as a partition plate is fixed to a housing 1 having a substantially triangular cross section. A low-speed side shaft 3 is rotatably supported in the housing 1, and a disc-shaped member 4 is provided inside the low-speed side shaft 3, and an outer ring 5 is attached to an outer edge portion of the disc-shaped member 4. There is.

A high speed side shaft 6 which is a central roller is eccentrically (offset) with respect to the low speed side shaft 3 and the outer ring 5 and is rotatably provided in the housing 2.

As shown in FIG. 5, between the outer ring 5 and the high speed side shaft 6, a large diameter guide roller 7 which is an intermediate roller, and movable rollers 9a and 9b which are intermediate rollers and move during torque transmission. And are installed.

As shown in FIG. 3, the support shafts 10 and 10 for rotatably supporting the movable rollers 9a and 9b via needle bearings composed of cages and rollers are arranged between the high speed side shaft 6 and the outer ring 5, as shown in FIG. It is constructed so that it can move in the direction in which the "wedge" is generated, and is biased by springs 11 and 11 (see FIG. 5) in the direction in which the "wedge" is generated.

As a result, during normal rotation, the movable roller 9
The a moves between the high speed side shaft 6 and the outer ring 5 in a direction in which a "wedge" is generated, and generates a pressing force Fc. Traction force is generated by this Fc, and torque can be transmitted.

On the other hand, at the time of reverse rotation, the movable roller 9b moves in the direction in which a "wedge" is generated between the high speed side shaft 6 and the outer ring 5 and generates a pressing force Fc. Traction force is generated by this Fc, and torque can be transmitted. As described above, in the present embodiment, it is possible to transmit torque for both forward and reverse rotations.

The forward and reverse rotation directions are arbitrary, and the movable roller 9b may be operated during normal rotation and the movable roller 9a may be operated during reverse rotation.

In this embodiment, similarly to the first embodiment, the housing 2 has rollers 7, movable rollers 9a and 9a.
b, a grease filling hole 20 for supplying grease to the outer ring 5 and the high speed side shaft 6 is provided. Therefore, when the wedge roller transmission B is used, the wedge roller transmission B is
Since grease can be replenished without disassembling, the lubrication state and life can be further improved. Other configurations, operations, and effects are the same as those in the first embodiment, so description thereof will be omitted.

(Third Embodiment) FIG. 6 shows a third embodiment of the present invention.
FIG. 3 is a cross-sectional view of the wedge roller type transmission according to the embodiment. A sectional view taken along the line AA is the same as FIG. 2 or FIG. Further, the same components as those of the first or second embodiment are designated by the same reference numerals and the description thereof will be omitted.

In this embodiment, the grease sealing hole 20 is used.
A grease-filled syringe 22 is attached to the roller, and the rollers 7, 8, 9, 9a, 9b are inserted from the injection needle of the syringe 22.
(See FIG. 2 or FIG. 5), the outer ring 5 and the high speed side shaft 6 can be filled with grease. Also in this case, when the wedge roller transmission B is used, the grease can be replenished without disassembling the wedge roller transmission B, so that the lubrication state and the life can be further improved. The needle of the syringe 22 is, as described above, the roller 7,
It is preferable to insert it near the center of 8, 9, 9a and 9b.

(Fourth Embodiment) FIG. 7 shows a fourth embodiment of the present invention.
FIG. 3 is a cross-sectional view of the wedge roller type transmission according to the embodiment. A sectional view taken along the line AA is the same as FIG. 2 or FIG. Further, the same components as those of the first or second embodiment are designated by the same reference numerals and the description thereof will be omitted.

In the present embodiment, a grease reservoir 23 is provided outside the transmission, and grease is automatically supplied from the grease reservoir 23 into the transmission through the grease sealing hole 20 by a pressure higher than the inside. It is designed to be enclosed.

As a method of producing the pressure difference, there are a method of providing a weight 24 as shown in FIG. 7, a method of using a hydraulic mechanism, and the like. In addition, if you install a device that can control the pressure, you can control the amount of grease and the timing
More optimal grease encapsulation can be performed. The enclosed position and the gap volume are the same as those in the above-described first or second embodiment. As a result, the grease can be automatically filled, and the effect of refilling the grease can be obtained without maintenance.

The present invention is not limited to the above-mentioned embodiments, but can be modified in various ways.

[0042]

As described above, according to the present invention,
Since the housing has a grease filling hole for supplying grease to the rollers, when the wedge roller type transmission is used, the grease can be replenished without disassembling the wedge roller type transmission. Can be further improved.

[Brief description of drawings]

FIG. 1 is a sectional view of a wedge roller type transmission according to a first embodiment of the present invention.

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

FIG. 3 is a diagram for explaining the operation of the wedge roller type transmission.

FIG. 4 is a sectional view of a wedge roller type transmission according to a second embodiment of the present invention.

5 is a cross-sectional view taken along the line AA of FIG.

FIG. 6 is a sectional view of a wedge roller type transmission according to a third embodiment of the present invention.

FIG. 7 is a sectional view of a wedge roller type transmission according to a fourth embodiment of the present invention.

[Explanation of symbols]

1,2 housing 3 Low speed side shaft 4 Disc-shaped member 5 outer ring 6 High speed side shaft 7,8 guide roller 9, 9a, 9b movable rollers 10 Support shaft 11 spring 20 Grease filling hole 21 Cover member 22 syringe 23 Grease reservoir 24 weights

Claims (3)

[Claims] 1. A friction roller type transmission in which at least two rollers having smooth surfaces are strongly pressed and a lubricating oil film is interposed between them to transmit power, and grease is supplied to the housing and the rollers. A friction roller type transmission characterized in that it is provided with a grease filling hole for 2. A central roller that rotates in a housing, with an outer peripheral surface serving as a first cylindrical surface, and an inner peripheral surface that serves as a second cylindrical surface, around the central roller, inside the housing, the central roller, and An outer ring that is freely rotatable relative to the housing, a rotating shaft that is concentric with the outer ring and has one end coupled to the outer ring, and an annular space between the first cylindrical surface and the second cylindrical surface. A plurality of support shafts arranged in parallel with the rollers, and a plurality of intermediate rollers rotatably supported by the support shafts, each of which has an outer peripheral surface as a third cylindrical surface; By making the center of the center roller and the center of the rotating shaft and the center of the outer ring eccentric, the width dimension of the annular space is made unequal in the circumferential direction, and at least one intermediate roller of the plurality of intermediate rollers is provided. At least before While the movable roller is supported so as to be displaceable in the circumferential direction of the annular space, and the remaining intermediate roller is used as a guide roller, the center roller and the outer ring are arranged in a predetermined direction between the center roller and the rotation shaft. When rotating at a speed ratio commensurate with a gear ratio, in a friction roller transmission that uses a wedge action to move the intermediate roller, which is the movable roller, to a narrow portion of the annular space, in the housing, grease is applied to the roller. A friction roller type transmission characterized in that it is provided with a grease sealing hole for supplying the oil. 3. A cover member for closing the grease sealing hole is further provided.
The friction roller type transmission described in.