JP2562079B2 - Rotational speed controller for continuously variable transmission - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a rotation speed control device for performing a gear shifting operation of a continuously variable transmission or the like by using air pressure.

[Conventional technology]

When using a continuously variable transmission for an industrial machine, the distance between the installation location of the continuously variable transmission and the gear shifting position becomes large due to the large size of the machine, one-room control, use in high places, etc. It is difficult to control, and in the past, in order to satisfy the long-distance remote control of continuously variable transmission, the handle for gear shifting operation of the continuously variable transmission was rotated by the pilot motor, and the generator was installed on the output side. The rotation is controlled by.

[Problems to be Solved by the Invention]

The circuit using the conventional pilot motor is not suitable for high frequency, the shift time is long, the speed-up time and the deceleration time are the same, the whole device is large, the cost is high, and there are problems such as wear parts. there were.

The present invention solves the problems of the prior art. An air cylinder associated with a gear shifting member of a continuously variable transmission is operated by varying the command air pressure of the command pressure chamber. A continuously variable transmission that allows the working air pressure to be supplied / discharged as appropriate to set the piston forward / backward or equilibrium to control the rotation speed entirely by using the air pressure, and the amount of piston change due to load fluctuation can be automatically corrected. An object is to provide a rotation speed control device for a machine.

[Means for solving the problem]

The rotation speed control device for a continuously variable transmission according to the present invention includes an air cylinder 2 for changing the speed changing member of the speed-changed operation portion 1 of the continuously variable transmission, and a cylinder 16 and a communication port 20 adjacent to the air cylinder 2. A command provided with a working air pressure chamber 9 in communication with the working air pressure supply port 3 and the exhaust port 4 on the upper side 1 and a diaphragm 10 adjacent to the working air pressure chamber 9 for operating by changing the command air pressure. A pressure chamber 11 is provided, and a connecting pin 12 is inserted through the cylinder 16, the working air pressure chamber 9 and the command pressure chamber 11, and one end of the connecting pin is a diaphragm.
10 and the other end of which is operatively connected through an air cylinder 2 and a return spring 14 so as to be associated therewith, and an operating arm 15 provided on the connecting pin 12 is movably provided in the operating pneumatic chamber 9. Above and below the operating arm 15, valve bodies 5 and 6 capable of opening and closing the supply port 3 and the exhaust port 4 are provided so as to be freely movable, and return springs 7 and 8 are constantly urged toward the closing side. By moving the valve element 5 or 6 against the return spring so that the supply port or the exhaust port can be opened, and the valve element can be closed by the return spring when the pressure in the command pressure chamber and the return spring are in equilibrium. By changing the command air pressure supplied to the command pressure chamber from the outside, it is possible to change the member that shifts gears and automatically correct the position change of the piston with respect to the load change.
[Operation] Since the present invention has such a configuration, when increasing the speed of the continuously variable transmission, the command air pressure up to the predetermined pressure in the command pressure chamber 11 is increased to bulge the diaphragm 10 to the right, and the connecting pin 12
To the right, and the supply side valve body 5 of the working air pressure chamber 9 is opened against the spring 7 by the movement of the working arm 15 of the connecting pin,
The working air pressure is supplied from the working air pressure supply port 3 to the working air pressure chamber 9,
The air is supplied to the cylinder 16 through the communication port 20, and the piston 13 of the air cylinder 2 is pressed against the return spring 14 to press the speed changing member of the speed-changed operation portion 1. The pressing movement of the speed-changed operation portion displaces the length of the return spring to cause a pressure change, and when the force of the return spring 14 and the pressure of the command pressure chamber 11 are balanced, the operating arm 15 returns to a predetermined position and the supply side The urging force of the return spring 7 of the valve body 5 works to close the valve body 5.

On the contrary, when decelerating the continuously variable transmission, the command air pressure in the command pressure chamber 11 is reduced and the action of the return spring 14 causes dust to move the diaphragm 10 to the left and the connecting pin 12 to the left. Then, by moving the operating arm 15 of the connecting pin, the exhaust side valve body 6 of the operating air pressure chamber 9 is opened against the spring 8, and the operating air pressure of the cylinder 16 is exhausted to the outside from the exhaust port 4 of the operating air pressure chamber 9. The piston 13 of the air cylinder 2 is returned to the original position by the elastic force of the return spring 14, and the member for changing the speed of the speed-changed operation part 1 is returned to the original position. When the forces are balanced, the operating arm 15 returns to a predetermined position and the exhaust side valve element 6 is closed by the spring 8 acting. When there is no change in the command pressure chamber 11, the rotation keeps the same rotation. Further, due to load fluctuation, the return spring for returning the piston of elastic component of the air pressure loosens, the pressure in the command pressure chamber increases, the valve body 5 is opened, and the working air pressure is replenished to the working pressure chamber and the command pressure chamber and the return spring. Due to the balance of force, it is automatically returned to its original position.

〔Example〕

The present invention will be described below with reference to the embodiments shown in the drawings.

 FIG. 1 shows a low speed, and FIG. 2 shows a high speed.

1 to 4, the belt type continuously variable transmission is provided with a fixed conical plate and a movable conical plate of the input side speed change V pulley V ₁ .
Changing the rotation speed of the output shaft by moving the movable conical plate back and forth with respect to the fixed conical plate is the same as in the conventional belt type continuously variable transmission. In the embodiment, the movable conical plate is used as a member for shifting the speed-changed operation portion 1.

A is a rotation speed control unit attached to a casing B of the continuously variable transmission, in which a cylinder 16 of the air cylinder 2 is formed, and a piston 13 is provided in the cylinder and a partition wall 18 to be described later of the body A is formed. It is provided with a hollow shaft portion 19 integrally formed at the center of the piston so as to be slidable for a constant stroke, and a return spring 14 is interposed between an end portion of a connecting pin 12 and a piston 13, which will be described later, to move the front end of the piston to a movable cone. The thrust bearing (17) provided on the plate is brought into contact with the piston, and the movable conical plate is pressed by the piston (13) in the high speed direction.

Reference numeral 9 denotes a working air pressure chamber provided in the rotation speed controller body A through a cylinder 16 and a partition wall 18, and a communication port 20 is provided in the partition wall 18 to communicate the working air pressure chamber and the cylinder 16 with each other. The chamber 9 is an annular valve chamber that communicates with the central portion, and an operating air pressure supply port 3 is provided on one side at an upper portion 9a of the valve chamber, and a supply side valve body 5 for opening and closing the supply port 3 will be described later. The upper part of the operating arm 15 is movably provided, and is constantly biased in the closing direction by a return spring 7, and an exhaust port 4 is provided on the other side of the lower part 9b of the valve chamber to open and close the exhaust port 4. The exhaust side valve body 6 is movably provided at the lower part of an actuating arm 15 which will be described later, and is held by a return spring 8 in a constantly biased direction in the closing direction.

Reference numeral 11 is a command pressure chamber provided in the rotation speed control unit A adjacent to the working air pressure chamber 9 through a partition wall 21, and is a diaphragm.
A command air pressure hole 22 provided in one of the pressure chambers is provided to displace the command air pressure so that the diaphragm 10 is bulged and displaced left and right as shown in FIGS. 3 and 4. Reference numeral 23 is an atmospheric pressure hole of the other pressure chamber 9b.

12 is the cylinder 16, the working air pressure chamber 9, the command pressure chamber 11
And one end of which is connected to the diaphragm 10 and the other end of which is operatively connected through the piston 13 and the return spring 14 of the air cylinder 2 and which actuates the valve bodies 5 and 6 of the working air pressure chamber. A connecting pin provided with an arm 15. One end 12a of the connecting pin 12 is fixed to the center of the diaphragm 10 and is inserted through the through hole 24 of the partition wall 21 and the through hole 25 of the shaft portion 19 that freely slides the partition wall 18 and the piston 13, and the connection thereof is made. The return spring 14 is interposed between the other end 12b of the pin and the piston 13 to press the piston 13 in the low speed direction by the urging action of the return spring 14, and the reaction force of the return spring 14 and the pressure of the command pressure chamber 11 And connecting pin 12
Therefore, they are always in tension with each other.

Further, an operating arm 15 is integrally provided in the middle of the connecting pin 12 in an orthogonal shape so as to be movable in the position of the operating air pressure chamber 9, and the valve bodies 5 and 6 are provided in upper and lower through holes 15a and 15b of the operating arm. The thin shafts 5a and 6a are fitted and held with a slight dead zone (play required for control) in the axial direction, and the return springs 7 and 8 are interposed between the valve body and the valve chamber. When the command pressure of the command pressure chamber 11 is changed by keeping the pressure contacting the supply port 3 or the exhaust port 4 at all times, the action of the diaphragm 10 moves the connecting pin 12 to the left or right, whereby the actuating arm 15 moves to the left or right. Is moved to collide with the collar portion at the end of the valve body 5 or 6 and co-operate, and is moved against the return springs 7 and 8 beyond the dead zones of the thin shaft portions 5a and 6a of the valve bodies 5 and 6. The valve body 5 or 6 can be opened apart from the supply port 3 or the exhaust port 4. When one of the valve bodies is actuated by the actuating arm, the other valve element causes the actuating arm to move only within the dead zone but not move. When the pressure in the command pressure chamber 11 and the force of the return spring 14 reach an equilibrium state, the valve spring 5 or 6 is closed by the action of the return spring 7 or 8. In the figure, 26, 27 and 28 are pneumatic seals, and 29 is a concave hole formed in the shaft end of the fixed conical plate so that the connecting pin can be slightly inserted. V ₂ is a shift V pulley on the output side, 30 is a shift V pulley
It is a belt.

According to the structure of the present invention, when the input side movable conical plate of the speed-changed operation portion 1 is moved from the low speed state of FIG. 1 to the high speed state of FIG. By supplying a predetermined command air pressure by a remote command through the command air pressure hole 22 to increase the pressure, the diaphragm as shown in FIG.
10 is bulged to the right and the connecting pin 12 is moved to the right to move the upper part of the operating arm 15 above the dead zone of the valve body 5 in the operating air pressure chamber 9 to cooperate with the valve body 5 and the spring 7 To the right to open the valve body 5, feed the working air pressure into the working air pressure chamber 9 from the supply port 3, and through the communication port 20 to the cylinder.
The feed piston 13 pushes the movable cone on the input side to move it to the high speed side. At this time, since the lower portion of the operating arm 15 is in the dead zone of the thin shaft portion 6a of the exhaust valve body 6, the exhaust port 4 is closed.

When the pressure in the command pressure chamber 11 and the return spring 14 are in equilibrium, the supply side valve body 5 is closed by the return spring 7 and the rotation speed is maintained at that position.

Conversely, when the input side movable conical disc is moved from the high speed state of FIG. 2 to the low speed state of FIG. 1, the command air pressure in the command pressure chamber 11 is reduced by a remote command, so that the diaphragm as shown in FIG. 10 is swollen to the left, the connecting pin 12 is moved to the left, and the lower part of the actuating arm 15 moves above the dead zone of the valve element 6 in the actuating pneumatic chamber 9 and cooperates with the valve element 5 to move the spring 8 Counterclockwise to the left and open the valve body 6,
By exhausting the working air pressure of 16 and the working air pressure chamber 9 to the outside from the exhaust port 4, the working air pressure in the cylinder 16 is discharged and the piston 13 returns to the original position by the force of the return spring.
The input side movable conical plate moves to the low speed side. At this time, the upper part of the operating arm 15 is in the dead zone range of the thin shaft portion 5a of the supply side valve body 5, and the supply port 3 is in the closed state.

When the pressure in the command pressure chamber 11 and the return spring 14 are in equilibrium, the exhaust side valve body 6 is closed by the return spring 8 and maintains its rotational speed position.

Even if a load is generated in the continuously variable transmission and the piston 13 is pushed in the low speed direction by the air cushion, the return spring 14 is loosened by the movement of the piston, the pressure in the command pressure chamber 11 becomes larger than the force of the return spring 14, and the connecting pin 12 is moved, the supply side valve body 5 is opened by the operation arm 15, the operation air pressure is sent to the operation air pressure chamber 9, and moves to the high speed side until the pressure of the command pressure chamber 11 and the force of the return spring 14 are balanced. , Correct the deceleration amount.

〔The invention's effect〕

As described above, the present invention operates the diaphragm by changing the command air pressure, and changes the member that shifts the gear shift operation portion by the piston of the air cylinder by moving the connecting pin and opening and closing the valve body by the operating arm. The rotation speed of the continuously variable transmission can be changed, and the shift operation can be performed from a long distance from the machine.Moreover, the amount of change in the piston due to the elasticity of the air pressure due to load changes is the pressure in the command pressure chamber and the return spring. It is automatically corrected to the original position by the balance of the force of the control, so the rotational fluctuation rate due to the load of the continuously variable transmission is extremely small, and the dead zone can be reduced, so the handle for long distances can be handled. It has good sensitivity even during operation and high rotational speed accuracy. Furthermore, because of the above-mentioned configuration, the entire size can be reduced.

Further, since the air pressure is used, the shift time can be freely set, and there is an advantage that the applied control of the automatic control can be easily incorporated.

Since it has no structural failure, it is suitable for the future computer age.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a sectional view of a continuously variable transmission equipped with a rotation speed control device of the present invention at a low speed, FIG. 2 is a sectional view at the same high speed, and FIG. 3 is a command pressure. FIG. 4 is an enlarged cross-sectional view when the pressure in the chamber is increased, and FIG. 4 is an enlarged cross-sectional view when the pressure is low. 1 ... Continuously variable transmission operation part, 2 ... Air cylinder, 3 ... Supply port, 4 ... Exhaust port, 5,6 ... Valve body, 7,8 ...
… Return spring, 9 …… Operating air pressure chamber, 10 …… Diaphragm, 11 …… Command pressure chamber, 12 …… Connecting pin, 13 …… Piston, 14 …… Return spring, 15 …… Operating arm.

Claims (1)

(57) [Claims] 1. An air cylinder (2) for varying a speed change member of a speed-changed operation portion (1) of a continuously variable transmission and a communication port (20) which is adjacent to the air cylinder (2). And a working air pressure chamber (9) provided with a working air pressure supply port (3) on one side of the upper part and an exhaust port (4) on the other side of the lower part, and changing the command air pressure adjacent to the working air pressure chamber (9) And a command pressure chamber (11) provided with a diaphragm (10) which is operated by the above, and is provided with a connecting pin (12) which is inserted into the cylinder (16), the working air pressure chamber (9) and the command pressure chamber (11). , One end of the connecting pin (12) is connected to the diaphragm (10) and the other end is connected to the piston (1) of the air cylinder (2).
3) and a return spring (14) interveningly connected so as to be associated with each other, and an operating arm (15) provided on the connecting pin (12) is movably provided in the operating air pressure chamber (9). Above and below the arm (15), the supply port (3) and the exhaust port (4)
The valve bodies (5) and (6) for opening and closing are provided so as to be freely movable, and are normally biased toward the closing side by the return springs (7) and (8). 5) or (6) is moved against the return spring to open the supply port or the exhaust port, and the valve body can be closed by the return spring when the pressure in the command pressure chamber and the return spring force are balanced. , The rotation speed control of the continuously variable transmission characterized in that the member for gear shifting can be changed by changing the command pressure of the command pressure chamber from the outside and the piston position change can be automatically corrected with respect to the load change. apparatus.