JPH0559024U - Ring type power transmission - Google Patents

Abstract

(57) [Abstract] [Purpose] Improves various problems in the case of using a flexible power transmission, prevents bending of the power transmission, and prevents misalignment during gear shifting to reduce the life of the power transmission. And improve the power transmission efficiency. [Structure] Fixed pulley pieces 11 and 31 are provided on a drive shaft 2 and a driven shaft 3, respectively, and a movable pulley piece 12 is disposed so as to be opposed to the fixed pulley pieces 11 and 31 and slidable in the longitudinal direction of the shaft.
32 is a power transmission device 1 in which speed change pulleys 4 and 5 are attached, and a power transmission body is hung on a groove portion formed by these pulley pieces and 5. This power transmission device 1
In addition, the fixed pulley pieces 11 and 31 mounted on the drive shaft 2 and the driven shaft 3 have an asymmetrical cross section as the power transmission body between the speed change pulleys 4 and 5 arranged on the same side with respect to the power transmission body. Then, the rigid ring body 7 whose center of gravity is provided on the center line of the ring body is used, and the idler 8 is brought into contact with the inner peripheral surface of the ring body 7.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a ring type power transmission device, and more specifically, a speed change pulley is disposed on a drive shaft and a driven shaft, and a ring body is attached as a power transmission member between these pulleys so that the drive shaft does not rotate on the driven shaft. The present invention relates to a ring-type power transmission device that is capable of shifting and transmitting in stages.

[0002]

[Prior Art]

 Generally, in a power transmission device in which a speed change pulley is provided on each of the drive shaft and the driven shaft, and a power transmission member is hung between these pulleys to continuously rotate the drive shaft to the driven shaft for variable speed transmission, As the body, a belt made of rubber or resin, or a chain-type flexible belt made of metal was used. Moreover, in the conventional power transmission device, there is a problem in that the belt is misaligned when the belt moves from a low speed to a high low speed or in the opposite direction, and the belt is damaged early. A belt having an asymmetric cross section is used in which the inclination angle of one surface is 0 to 5 ° and the inclination angle of the surface contacting the side surface of the other pulley is 13 to 20 °.

[0003]

[Problems to be solved by the device]

 However, in the case of a power transmission body consisting of a flexible rubber or resin belt or a metal chain-type belt, when the power transmission body separates from the pulley, the power transmission body is unnecessarily wound and has a large convex inner peripheral surface. Bending was performed so that this would give bending fatigue to the power transmission body, shorten its life, and could not transmit power efficiently. The present invention improves the various problems in the case of using a power transmission body having flexibility, which is such a problem, and prevents bending of the power transmission body and misalignment of the power transmission body during shifting. It is an object of the present invention to provide a ring type power transmission device which has a long life and improved power transmission efficiency.

[0004]

[Means for Solving the Problems]

 That is, the feature of the present invention is that the drive shaft and the driven shaft each have a fixed pulley piece, and a movable pulley piece that opposes the fixed pulley piece and is slidably installed in the longitudinal direction of the shaft. In a power transmission device in which a pulley is attached and a power transmission body is hung on the groove formed by these pulley pieces, the fixed pulley piece mounted on the drive shaft and the driven shaft is the same for the power transmission body. A rigid ring body having an asymmetric cross section as the power transmission body and having its center of gravity located on the center line of the ring body is used between the two speed change pulleys arranged on the side, and the idler is attached to the ring body. It is in a ring type power transmission that is in contact with the inner peripheral surface.

[0005]

[Action]

 In such a ring-type power transmission device, since the power transmission body is a rigid circular ring body, bending does not occur when the ring body separates from the pulley and winds to form a convex inner peripheral surface. It runs smoothly to improve power transmission efficiency, and even if the ring body has an asymmetrical cross section, the alignment of the ring body shifts from low speed to high speed or the opposite direction. Is small, the gear shifts smoothly, and the shape of the head is arbitrarily changed so that the center of gravity of the ring body is installed on the center line of the ring body, which allows the ring body to be biased in one direction. It is possible to prevent uneven wear on the side surface of the ring body.

[0006]

【Example】

 Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a sectional view of a ring type power transmission device according to the present invention. The ring type power transmission device 1 according to the present invention is applied to a continuously variable transmission (CVT) mounted on a two-wheeled vehicle, an automobile, an agricultural machine, and the like. A drive shaft 2 and a driven shaft 3 which are indirectly connected to each other are arranged in a horizontal direction, and speed change pulleys 4 and 5 are indirectly mounted on these shafts 2 and 3, respectively, and a distance between the pulleys 4 and 5 is extended. A circular ring body 7 which is a power transmission body is suspended. Moreover, the idler 8 is engaged with the inner peripheral surface 9 of the ring body to hold the ring body 7. This position is preferably on the tight side of the ring body.

Each of the speed change pulleys 4 and 5 is composed of fixed pulley pieces 11 and 31 and movable pulley pieces 12 and 32 slidably installed with respect to the fixed pulley pieces. It is hung on an asymmetric groove formed by both pulley pieces. The fixed pulley pieces 11 and 21 are arranged on the same side with respect to the ring body 7. As a result, since the movable pulley pieces 12 and 22 are on the same side, the widthwise dimension of the power transmission device is reduced.

Of these, in the speed change pulley 4 mounted on the drive shaft 2, a fixed pulley piece 11 is fixed to the drive shaft 2, and on the other hand, a movable pulley piece 12 is fixed at a position facing the fixed pulley piece 11. It is fitted on the sheave shaft 13 and at the same time is fitted on the spline or the sliding key 14, so that it can rotate together with the sheave shaft 14 and can slide in the axial direction.

A hydraulic cylinder portion 15 is provided at the back of the movable pulley piece 12. The hydraulic cylinder portion 15 is defined by a fixed plate 16 fixed to the sheave shaft 13 of the fixed pulley piece and a cylindrical side wall 17 of the movable pulley piece, and the internal pressure is increased by supplying and discharging a fluid such as hydraulic oil as a pressure medium. The movable pulley piece 12 is moved in the direction of the arrow in the figure. Needless to say, packing is attached to the top surface of the fixing plate.

The hydraulic oil passes from a fluid passage 18 provided in the drive shaft 2 through a through hole 19 provided between the drive shaft 2 and the sheave shaft 13 and a supply port 20 provided in the movable pulley piece 12 to a hydraulic cylinder. On the other hand, the hydraulic oil is supplied to the portion 15 and is discharged from the outlet 21 provided in the sheave shaft 13 through a gap provided between the drive shaft 2 and the sheave shaft 13, and the inner peripheral surface 9 of the ring body and Lubricate the pulley wall surface 22.

On the other hand, in the speed change pulley 5 mounted on the driven shaft 3, the fixed pulley piece 31 is fixed to the driven shaft 3, and on the other hand, the movable pulley piece 32 is attached to the fixed pulley piece 31 so as to face the sheave shaft. An asymmetrical groove is formed which is fitted on the ring 33 and engages the ring body 7. The movable pulley piece 32 is slidable on the sheave shaft 33 of the fixed pulley piece and is movable in the axial direction. To the right of the movable pulley piece 32, a flange-shaped stopper 34 is provided. It is fixed on the shaft 33, and two coil springs 35 and 36 of large diameter and small diameter are attached between the stopper 34 and the movable pulley piece 32 while pressing the movable pulley piece 32 toward the fixed pulley piece 31. ing. Further, the driven shaft 3 is provided with a fluid passage 39 as in the drive shaft 2 so that hydraulic oil is supplied to the sliding portions between the members to improve lubricity. In the figure, reference numeral 38 denotes a torque transmission portion having a cam mechanism, which promotes the thrust of the movable pulley piece 32. The means for pressing the movable pulley piece 32 in the direction of the fixed pulley piece 31 is not limited to hydraulic pressure, springs, or torque cams, but means combining these or using a large number of small-diameter balls to utilize centrifugal force. It may be a means.

The inclination angles θ ₁ of the fixed pulley pieces 11 and 31 mounted on the drive shaft 2 and the driven shaft 3 are 0.2 to 1.5 °, and the inclination angle θ ₂ of the movable pulley piece − is It is 6 to 12 °.

The ring body 7 used in the present device is a rigid body such as metal or ceramics, and is divided into a pulley contact portion 40 and a head portion 41 that does not contact the pulley as shown in FIG. The pulley abutment portion 41 has an asymmetric cross section, and its inclination angle θ ₃ is 0.2 to 1. It is 5 °, and the other inclination angle θ ₄ is 6 to 12 °, which matches the inclination angle of the speed change pulley. Further, the height of the pulley contact portion 40 is made as small as possible within a range that can withstand the lateral pressure from the pulley wall surface, and the peripheral speed difference is made small. Furthermore, since the pulley contact portion 40 of the head portion 41 has an asymmetric cross section, its shape can be arbitrarily changed so that the center of gravity of the ring body 7 is located on the center line 42 thereof. The height should be made as small as possible to reduce the weight of the ring body 7.

In the present device, however, by supplying hydraulic oil to the hydraulic cylinder portion 15 provided on the movable pulley piece 12 of the speed change pulley 4 mounted on the drive shaft 2 to change the internal pressure thereof, the ring body is changed. 7 can be moved from the low speed position shown in FIG. 3 to the high speed position shown in FIG. In this case, since the drive shaft 2, the driven shaft 3 and the idler 8 are fixed, the center position of the ring body 7 moves diagonally.

[0015]

[Effect of the device]

 As described above, in the ring-type power transmission device of the present invention, since the power transmission body is a circular ring body having rigidity, when the ring body is separated from the pulley, bending that causes the ring body to wind and the inner surface to have a convex shape is formed. It runs smoothly without generation and improves power transmission efficiency, and because the ring body has an asymmetrical cross section, its alignment is maintained even when shifting from low speed to high / low speed or the opposite direction. Deviation is small, the gear shifts smoothly, and the shape of the head is arbitrarily changed so that the center of gravity of the ring body is located on the center line of the ring body. There is an effect that uneven wear can be prevented by preventing uneven wear on the side surface of the ring body.

[Brief description of drawings]

FIG. 1 is a sectional view of a ring type power transmission device according to the present invention.

FIG. 2 is a cross-sectional perspective view of a ring body used in the transmission device of the present invention.

FIG. 3 is a side view showing a low speed state of the ring type power transmission device according to the present invention.

FIG. 4 is a side view showing a high speed state of the ring type power transmission device according to the present invention.

[Explanation of symbols]

 1 ring type power transmission device 2 drive shaft 3 driven shaft 4 speed change pulley 5 speed change pulley 7 ring body 8 idler 11 fixed pulley piece 12 movable pulley piece 31 fixed pulley piece 32 movable pulley piece 40 pulley contact portion 41 head

Claims (2)

[Scope of utility model registration request] 1. A speed change pulley comprising a fixed pulley piece and a movable pulley piece, which is installed to be slidable in the longitudinal direction of the shaft so as to face the fixed pulley piece, is attached to each of the drive shaft and the driven shaft. In a power transmission device in which a power transmission body is suspended in a groove portion formed by both pulley pieces, a fixed pulley piece mounted on the drive shaft and a driven shaft is arranged on the same side with respect to the power transmission body. In between, a rigid ring body having an asymmetric cross section as the power transmission body and having its center of gravity located on the center line of the ring body was used, and the idler was brought into contact with the inner peripheral surface of the ring body. A ring type power transmission device characterized in that 2. The ring type power transmission device according to claim 1, wherein the ring body comprises a pulley contact portion that contacts the pulley wall surface and a head portion that does not contact the pulley wall.