JPH0328560A - Continuously variable transmission - Google Patents

Abstract

PURPOSE:To intend complete stop of output system rotation with the operation of a change gear member by leaving a space between a taper cone and a rotational element with the pressure of the change gear member when moved to a most reduced position and providing output stop mechanism to cut off motive force. CONSTITUTION:A fork 22 connected to an operation shaft 21 is engaged with the sleeve 8s of a rotational element 8 to allow cut-off motive force with released contact of the rotational element 8 with a taper cone 7 by the pull operation of the operation shaft 21 even during transmission, and at the outer periphery of the rotational element 8 a contact piece 8b is provided, on which the pressure of a change gear member 10 operates in case that the change gear member 10 is set in a most reduced position. When the member 10 operates in a reduced gear direction to lead output rotation from the the gear to an almost stop region, a space between the taper cone 7 and the rotational element 8 is given by pressure on the contact piece 8b, so that motive force on the rotational element 8 is cut off and at the same time the rotation of a sprocket 12 is surely stopped by brake force from the member 10 on the rotational element 8.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a continuously variable transmission, and more specifically, a rotating member and a carrier are disposed on the same axis, and a tapered cone is freely rotatably supported with respect to the carrier. , and relates to a continuously variable transmission configured to form a transmission path between the tapered cone and the rotating member, and to change the relative speed between the rotating member and the carrier by adjusting the position of the shifting member in contact with the tapered cone. be.

[Conventional technology]

Conventionally, there is a continuously variable transmission device configured as described above, as shown in Japanese Patent Application Laid-Open No. 62-270858.
In this reference, a taper cone rotates following the inner surface of a ring-shaped transmission member, and by adjusting the position of this transmission member, the rotational power extracted from the rotating body can be adjusted steplessly, including stopping the rotation of the carrier. It is configured as follows.

[Problem to be solved by the invention]

However, in order to set the rotational power output from the device to a stopped state in this manner, it is necessary to accurately set and maintain the speed change member at a predetermined position of the taper cone.

In other words, in a continuously variable transmission device with a structure in which a tapered cone is supported on a carrier in this way, the set position of the transmission member for stopping the output system exists as a "point" state.
It is difficult to set the speed change member to this "point" position, and for example, if this device is installed in a traveling system such as a work vehicle, even if you try to stop the vehicle from moving by operating the speed change member, it will not work. , the vehicle body may move at low speed.

An object of the present invention is to construct a continuously variable transmission device that can reliably stop the rotation of an output system by operating a transmission member as simply as possible.

[Means to solve the problem]

A feature of the present invention is that a tapered cone is freely rotatably supported on a carrier configured to be rotatable around an axis, and a rotating body contacts the tapered cone from the side opposite to the carrier, and contacts the taper cone by moving along the axis. A speed change member is provided to set the speed change rate between the carrier and the rotating body to an arbitrary value by changing the position, and the speed is increased by moving the speed change member toward the carrier side, and the speed change member is moved toward the rotating body side. In addition to constructing a continuously variable transmission system with the characteristic of decelerating by movement, an output stop mechanism is used that uses the pressing force of the transmission member to separate the taper cone from the rotating body and cut off the power when the transmission member moves to the maximum deceleration position. The functions and effects are as follows.

[For production]

If the above characteristics are configured as shown in FIG. 1, for example, the speed change member (10) is operated to the deceleration side, and the speed change member (10) is moved to the position where the rotation of the output system almost stops (maximum deceleration position). When this is reached, the rotating body (8) is moved in the direction away from the taper cone (7) by the pressing force from the transmission member (10), and the transmission from the taper cone (7) to the rotating body (8) is will be cut off.

In other words, with this configuration, it is possible to increase, decelerate, and even stop within the range of continuous operation of the transmission member (10), and furthermore,
Since the speed change member (10), which does not rotate, comes into contact with the rotating body (8), the rotating body (8) reaches a braking state at the same time as the power is cut off.

In addition, in this configuration, the output stop mechanism (B) is connected to the rotating body (8).
The structure and the rotating body (8) are allowed to move relative to the main axis (3).
) and a contact piece (8b) provided on the outer periphery.

〔Effect of the invention〕

Therefore, a continuously variable transmission device that can reliably stop the rotation of the output system by operating the transmission member has been constructed relatively easily.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

As shown in FIG.
), and a manual gear (
4) freely rotatably supports the integrally formed carrier (5), and its support shaft (6) is engaged and supported by the holding portion (5a) formed on the carrier (5). Three taper cones (7) are provided, and a disc-shaped rotating body (8 ), and an automatic pressure adjustment mechanism (A) that adjusts the contact pressure between the rotating body (8) and the taper cone (7) are provided coaxially with the main shaft (3), and the axial center of the main shaft (3) is Rod (9) parallel to (P)
), the ring-shaped transmission member (1) is configured to be able to adjust its position along the
0), and the taper cone (7)... A supporting member (11) having a protruding edge (Ila) in contact with an annular recess (7a) formed on the small diameter side of each, and rotatably supported on the main shaft (3>).
), and a sprocket (l2) for extracting power from the main shaft (3) to form a friction-type continuously variable transmission.

In addition, in this transmission, a twenty dollar bearing (13) is arranged between the carrier (5) where the manual gear (4) is formed and the main shaft (3), and the shaft (6) and A twenty dollar bearing (I5)... is arranged between the taper cone (7), between the support member (1l) and the main shaft (3), and between the support member (11) and the carrier (5), respectively. A twenty-one dollar bearing (l6) and a thrust bearing ({7) are arranged at
As shown in the figure, a transmission member (18) is slidably movable along the axis (P) and is fitted onto the main shaft (3) so as to transmit torque, and a transmission member (18) is formed on the transmission member (18). A ball (19) that is sandwiched between a plurality of cam surfaces (18a) formed on a sleeve portion (8s) of a rotating body (8), and a coil spring for setting an initial pressure. (20), and this automatic pressure regulating mechanism (A
), as the load increases, the balls (19)... ride on the cam surfaces (18a), (8a), and as a result, the rotating body (8
) is brought into stronger pressure contact with the taper cone (7).

In this way, the ball (I9)... is on the cam surface (8a),
The phenomenon of running aground on (18a) is caused by carrier (5)
A slide bearing (l7) is installed between the support member (11) and the
) is provided to close the thrust force from the automatic pressure regulating mechanism (A), so it can be said that it is generated by the reaction force from the carrier (5).

Furthermore, the sleeve portion (8s) of the rotating body (8) has an operating shaft (
2l) is engaged with a fork (22) connected to the
Even during transmission, by pulling the operating shaft (2l), the contact between the rotating body (8) and the taper cone (7) can be released and the power can be cut off. ,
A contact piece (8b) is provided on which the pressing force of the speed change member (10) acts when the speed change member (10) is set to the maximum deceleration position, and when the speed change member (10) is operated in the deceleration direction. When the output rotation from the device reaches a point where it slightly stops, the second
As shown in the figure, as a result of the pressing force acting on the abutment piece (8b) separating the taper cone (7) and the rotating body (8), the power to the rotating body (8) is cut off, and at the same time,
It is configured such that the rotation of the sprocket (12) is reliably stopped by the braking force acting on the rotating body (8) from the transmission member (10).

The abutment piece (8b) and the structure that allows the rotating body (8) to slide relative to the main shaft (3) are collectively referred to as an output stop mechanism (B).

Moreover, flat surfaces (6a) are formed at both ends of the support shaft (6), and the support shaft (6) is configured to contact the holding portion (5a) with a wide surface.

In this transmission, when the transmission member (10) is operated within the transmission operation range (S) while transmitting power to the input gear (4), the transmission member (10) is at a contact position. Since the radius from the rotation axis of the taper cone (7) changes, that is, the circumferential length of the taper cone (7) at the position where the transmission member (10) contacts changes, so the carrier (5) is used as a unit. When rotated by the same amount, the amount of rotation of the taper cone (7) that rotates following the inner surface of the transmission member (10) changes, and the rotating body (8) to which power is transmitted from this taper cone (7) changes. The rotational speed of the carrier (5) changes with respect to the rotational speed of the carrier (5), and as a result, continuously variable speed power is extracted from the sprocket (12) parallel to the input gear (4).

Moreover, in this transmission, as shown in Fig. 2, the contact pressure of the rotating body (8) against the taper cone (7) is reduced to
, when the contact pressure of the transmission member (10) with respect to the tapered cone (7) is determined as (F2), the support member (11
) with respect to the taper cone (7) due to the two contact pressures (Fl) and (F2).
Since the taper cone (7) of the support member (11) is set at a location that can offset the moment acting on the support member (11),
The contact pressure for one holding part (5a
) as the center, p, x l , +l? ,x l 3 F2X l !
= 0 holds, the balance of moments is maintained, and each vector (Fl). (F2). (F3) will be closed as shown in FIG.

Incidentally, in this transmission, the protruding edge (
lla) is fitted into the annular recess (7a) of the taper cone (7), so when the position of the transmission member (10) is changed, the attitude of the taper cone (7) changes slightly and at the same time the protruding edge The pressing direction of (lla) against the annular recess (7a) changes to the direction of moment balance, so that a stable state is reached in a very short time, and furthermore,
Even when the contact pressure between the rotating body (8) and the taper cone (7) changes, such as when the load changes, a pressure proportional to this contact pressure is applied from the support member (It) to the taper cone (
7), the moment balance is maintained.

[Another example]

In addition to the embodiments described above, the present invention can be implemented in various ways, such as by supporting the support shaft of the taper cone in a swingable manner with respect to the carrier via a bottle or the like, and by providing an automatic pressure regulating mechanism on the upper side of the transmission. Further, the continuously variable transmission device can be used in various fields such as being included in a traveling transmission system of an agricultural vehicle, in a self-propelled vehicle body, and in a machine tool.

Incidentally, although reference numerals are written in the claims section for convenient comparison with the drawings, the present invention is not limited to the structure shown in the accompanying drawings.

[Brief explanation of drawings]

The drawings show an embodiment of the continuously variable transmission according to the present invention, and
Figure 2 is a cross-sectional view of the device, Figure 2 is a cross-sectional view showing the state of contact between the transmission member and the rotating member, Figure 3 is a diagram representing the force acting on the taper cone, Figure 4 is a diagram representing vectors, and Figure 5 is a diagram representing the force acting on the taper cone. The figure shows the holding part, and FIG. 6 is a sectional view showing the structure of the automatic pressure regulating mechanism. (5)...Carrier, (7)...Taper cone, (8)...Rotating body, (10)...
...speed change member, (B) ...output stop mechanism, (
P)・・・・・・Axis center.

Claims (1)

[Claims] Carrier (5) configured to rotate freely around the axis (P)
A rotary body (8) that freely rotatably supports a taper cone (7) and contacts this taper cone (7) from the side opposite to the carrier (5), and a rotating body (8) that moves along the axis (P) to rotate against the taper cone (7). Change the contact position and move the carrier (5)
and a speed change member (10) that sets the speed change rate between the rotary body (8) and the rotating body (8) to an arbitrary value, and the speed is increased by moving the speed change member (10) toward the carrier side. ) is configured to decelerate as it moves toward the rotating body, and when the speed change member (10) moves to the maximum deceleration position, the pressing force of the speed change member (10) causes the taper cone (7) to rotate. body(
Output stop mechanism (B) that cuts off the power by separating it from the
).