JPH0755403Y2 - Continuously variable transmission - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a continuously variable transmission used for an agricultural traveling machine body or the like.

[Problems to be Solved by Prior Art and Invention] Various continuously variable transmissions have been conventionally known, but the one installed in a transmission case is complicated and large in structure, and is expensive. However, it is not used in lightweight working machines such as cultivators due to the problem of lack of maintainability.

Therefore, as a simple one, continuously variable transmissions such as slide pulley type and cam type are known.However, in these types, when the clutch is cut off, the belt contacts the bearing on the rotating shaft. In addition to safety problems such as the shift, the traveling side will also be shifted at the same time as shifting to the PTO axis side, and as a result, when performing work traveling, the traveling speed and the PTO shifting are separated. When the load cannot be carried out and the load is heavy, the running becomes slow and the work efficiency is lowered.

[Means for Solving the Problems] The present invention was devised with the object of providing an infinitely variable transmission capable of eliminating these drawbacks in view of the above-mentioned circumstances. The input pulley to which the power of is input is formed in a tubular shape, and the pulley shaft of the input pulley is used as the first output shaft, while the second output shaft externally fitted to the first output shaft is freely rotatable. Is provided so as to extend into the tubular portion, and the shaft center is provided in the tubular portion so as to rotate about a spindle that is orthogonal to the axes of the output shafts as a fulcrum and to be movable in the axial direction of the spindle. The friction plate, the main roller integrally provided on the first output shaft so as to contact the friction plate at one position in the left-right direction of the friction plate support shaft, and the friction at the other side position in the left-right direction of the friction plate support shaft. The above-mentioned A continuously variable transmission mechanism including a shift roller provided on the dual output shaft, a shifter for shifting the shift roller at the shift speed, and an ammunition for biasing the friction plate toward the roller contact side. Is provided.

According to the present invention, the first output shaft does not change its speed, and only the second output shaft changes continuously with a simple structure.

[Embodiment] Next, an embodiment of the present invention will be described with reference to the drawings. In the drawings, 1 is an input pulley, 2 is an engine, 3 is an output pulley, 4 is a transmission belt, and the output of the engine 2 is transmitted to the input pulley 1 via the output pulley 3 and the transmission belt 4. All of the above are the same as conventional ones.

The input pulley 1 has a cylindrical shape with a bottom, and a base end portion of a PTO shaft (corresponding to the first output shaft of the present invention) 5, which is a pulley shaft, is integrally attached to the bottom portion of the input pulley 1. , This PT
A main roller 6 formed of a member having a large friction coefficient is integrally fixed to the bottom side of the O shaft 5. In addition, PTO axis 5
Passes through the transmission case 7 and is drawn out to the opposite side.

On the other hand, 8 is a traveling output shaft (corresponding to the second output shaft of the present invention) which is fitted on the PTO shaft 5 so as to be freely rotatable.
One end of the traveling output shaft 8 is provided so as to extend into the cylindrical portion of the input pulley 1, and a spline groove 8a is formed in the extended portion, and this spline groove is formed.
8a is provided with a speed change roller 9 formed of a member having large frictional resistance against the arrow so as to be movable in the axial direction. Further, a shifter 10 is engaged with the speed change roller 9, and the speed change roller 9 is moved to the PTO shaft 5 by the movement of the shifter 10 based on the push-pull operation of the connecting wire 11a based on the operation of the speed change lever 11. It is configured to move in the axial direction. Reference numeral 12 is a case which is integrally fixed to the transmission case 7 and rotatably supports the input pulley 1 via a bearing 12a so as to close the cylindrical portion of the pulley.
A shifter shaft 10a of the shifter 10 is provided in the case 12 so as to be movable in the axial direction.

Further, 13 is a bracket integrally fixed to the case 12, and a receiving body 14 is fitted in the bracket 13 so as to be urged toward the PTO shaft 5 side by a bullet 14a. A friction plate 15 is rotatably supported on the receiving body 14 via a bearing 16 so as to rotate about a support shaft 15a set to be orthogonal to the axis of the PTO shaft 5. Then, the friction plate 15 receives the urging force of the bullet 14a, and the main roller 6
And the speed change roller 9 are pressed against each other, whereby a power transmission system is constructed which reaches the traveling output shaft 8 through the PTO shaft 5, the main roller 6, the friction plate 15 and the speed change roller 9. However, with respect to the contact position of both rollers 6 and 9 with respect to the friction plate 15, the main roller 6 is located near the outer peripheral portion of the friction plate 15, and the speed change roller 9 has a moving range near the X-axis position of the friction plate 15. Is set to a position in the vicinity of the outer peripheral portion, and by the position adjustment of the shift roller 9 from the shaft support center X by the shifter 10, it is configured so that continuously variable travel speed can be achieved. , A PTO shaft 5 to a traveling output shaft 8 constitute a continuously variable transmission mechanism.

In the embodiment of the present invention configured as described above, the power from the engine 2 is transmitted to the input pulley 1 by belt transmission, and the input power is integrated with the input pulley 1 for the PTO shaft 5. It is transmitted to rotate,
The traveling output shaft 8 is transmitted in a continuously variable speed state.

That is, in the embodiment of the present invention, the power reaching the PTO shaft 5 is transmitted through the continuously variable transmission mechanism including the friction plate 15, the main roller 6 and the transmission roller 9 to the traveling output shaft. 8, the transmission mechanism is built in the tubular portion of the input pulley 1, so that the internal space of the input pulley 1 can be effectively utilized and compactly accommodated. Moreover, since the continuously variable transmission mechanism can be configured independently of the belt transmission mechanism between the output pulley 3 and the input pulley 1, it is possible to perform continuously variable transmission with the tension clutch. The continuously variable transmission is only for the traveling output shaft 8 and is independent of the PTO shaft 5. Therefore, this product has a simple structure and excellent safety, while exhibiting a sophisticated function in which intermittent power transmission and continuous gear shifting are independent, like a transmission case equipped with a continuously variable transmission mechanism. Becomes

In addition, since the main roller 6 and the speed change roller 9 are in contact with the shaft center X of the friction plate 15 in the arrangement configuration in which the main roller 6 and the speed change roller 9 are laterally distributed, the load acting on the friction plate 15 is as large as possible. In addition, the friction plate 15 can be smoothly rotated, and thus the transmission efficiency can be improved and the durability can be improved.

In addition, since the rollers 6 and 9 are pressed against the friction plate 15 by the urging force of the ammunition 14, slipping is effectively prevented, which improves the transmission efficiency and improves durability. Can be measured even more.

It should be noted that the present invention is not limited to the above-mentioned embodiment, and the point is that the continuously variable transmission mechanism for interlockingly connecting the first output shaft and the second output shaft may be housed inside the cylindrical shape of the input pulley. And, as the continuously variable transmission mechanism, not by friction as in the above embodiment, a rack-pinion system or the like,
The thing which can employ an appropriate thing.

[Advantages] In short, since the present invention is configured as described above, a continuously variable transmission mechanism is provided in the cylindrical portion of the input pulley so that only the second output shaft is independent of the first output shaft. In this way, the speed of the PTO shaft can be continuously changed without changing the speed as in the case of using it for agricultural work machines, and power interruption can be input separately. It is possible to have an advanced function that can be done during power transmission to the pulley, and for that purpose the continuously variable transmission mechanism should be arranged without obstruction by effectively utilizing the dead space inside the cylindrical part of the input pulley. This enables a compact design.

In addition, the continuously variable transmission mechanism has a simple structure with a simple structure that is constructed by using a friction plate that rotates about a support shaft whose axis is orthogonal to the output shaft, a main roller that contacts the friction plate, and a transmission roller. However, since the main roller and the speed change roller are arranged so as to be distributed on the left and right sides of the support shaft, the load acting on the friction plate is made uniform. In addition, the friction plate and the rollers are brought into contact with each other while being pressed by the urging force of the ammunition, so that the slip prevention effect is exerted, the transmission efficiency is improved, and the durability is improved.

[Brief description of drawings]

The drawings show an embodiment of a continuously variable transmission according to the present invention. FIG. 1 is a schematic perspective view of a work vehicle, and FIG. 2 is a sectional view of the continuously variable transmission. In the figure, 1 is an input pulley, 5 is a PTO shaft, 6 is a main pulley, and 8
Is an output shaft for traveling, 9 is a speed change pulley, and 15 is a friction plate.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Michiya Endo 667 Isuyacho, Higashi Izumo-cho, Yatsuka-gun, Shimane Prefecture 1 Mitsubishi Agricultural Machinery Co., Ltd. (56) Bibliography 61-22178 (JP, U) Kai 60-86667 (JP, U)

Claims (1)

[Scope of utility model registration request] Claim: What is claimed is: 1. An input pulley to which power from the engine is input is formed into a tubular shape, and the pulley shaft of the input pulley is used as a first output shaft, and the first output shaft is freely rotatably fitted to the outside. The second output shaft is provided so as to extend into the cylindrical portion of the input pulley, and in the cylindrical portion, the shaft center rotates about a spindle perpendicular to the shaft cores of these output shafts as a fulcrum, and the spindle shaft. A friction plate movably provided in the core direction, a main roller integrally provided on the first output shaft so as to abut against the friction plate at a position on one side in the left-right direction of the friction plate support shaft, and a friction plate support shaft. A shift roller provided on the second output shaft so as to come into contact with the friction plate at the other side position in the left-right direction so as to be movable in the left-right direction, a shifter for performing the shift movement of the shift roller, and a friction plate. And an ammunition that urges it toward the roller contact side. Continuously variable transmission, characterized in that the continuously variable transmission mechanism is disposed.