JPS6088258A - Stepless belt speed change gear - Google Patents

Abstract

PURPOSE:To simplify constitution and cut cost by controlling the speed change mechanism of a stepless belt speed change gear through a novel digital electromagnetic clutch by the output of a prime mover for driving a belt. CONSTITUTION:The captioned stepless speed change gear is equipped with a variable pulley pair constituted of fixed-side plates 3a and 7a and movable-side plates 3b and 7b, and a belt 11 is laid between the both variable pulleys. The side plate 3b of the variable pulley on the input side is shifted in the axial direction by the revolution of a gear 5, and as a result of this, the effective diameter of the variable pulley is varied. Further, this stepless speed change gear is equipped with a digital electromagnetic clutch 18 for controlling the revolution of the gear 5. Because of th revolution of a rotary ring 22 which receives the revolution of a prime mover 1, said electromagnetic clutch 18 revolves an output gear 17c step by step, when an exciting coil 24 is in conduction state, and the electromagnetic clutch 18 revolves the output gear 17c during the time when an exciting coil 24a is in conduction state.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device that changes the speed of a continuously variable belt transmission using the output of a prime mover that drives the device.

■In general, the speed of a continuously variable belt transmission is controlled by a manual lever, or by changing the effective diameter of the pulley using a servo device using a separate single-current electric motor to control the load at a constant speed. I am doing it.

In the former case, there is a drawback that the load on the manual lever is large and remote control cannot be performed.

In the latter case, there are disadvantages in that an expensive surface current motor is separately provided and a servo drive device is required.

The device of the present invention is characterized in that it eliminates the drawbacks of the conventional devices described above by providing a means for controlling the transmission failure of a continuously variable belt transmission device using the output of the prime mover that drives the belt. .

For this purpose, the use of a new latch device (referred to as a digital electromagnetic clutch) ff, which will be described later, has the effect of further simplifying the structure at a lower cost.

The details of the apparatus of the present invention having the above-mentioned features and effects will be described below with reference to embodiments.

FIG. 1 shows a known continuously variable belt transmission. The rotating shaft of the prime mover 1 (an electric motor or a gasoline engine is used) causes
Pulley 4 (Side plate is symbol 3a.

3b. ) is being driven.

The bell 1 is connected to a pulley 4 and a pulley 8, and its rotating shaft drives a load 1o via a reduction gear 9 (this is not necessarily a member). Pulley 8
are provided with side plates 7a and 7b. The symbol 6 is a device for detecting the rotational speed of the pulley 8, such as a tacho generator.

The device shown in FIG. 2(a) is a sectional view showing details of the pulley 8 described above. The hole 7 of the side plate 7a is formed by (b) the rotating shaft 8a (
(shown in FIG. 1), and the side plate 7b is configured to slide left and right with the side plate 7a or rotate synchronously with the side plate 7a by splines 13.

Further, the expansion spring 12 elastically repels the side plates 7a and 7b in a direction in which they approach each other.

The device shown in FIG. 2(b) is a detailed sectional view of the pulley 4 described above.

A rotating shaft 4a shown in the first diagram is press-fitted into the hole 3 of the side plate 3a. The side plate 3b can slide left and right with respect to the side plate 3a by the spline 14, and can rotate in synchronization with the side plate 3a.

The rotating shaft 5c of the gear 5 (shown with the same symbol in FIG. 1) is threadedly engaged with a member 5a fixed to the main body through a threaded portion 5b, so that the rotating shaft 5c rotates left and right due to the left and right rotation of the gear 5. Move to. The side plate 3b is held by a ball bearing 15 so as to be able to rotate once relative to the fixed member and restrained from moving from side to side. Freely movable, screw pestle 5c
It is supported to move left and right in synchronization with the left and right movement of.

With the above configuration, the rotation of the gear 5 from side to side causes the movement to occur.

Even if the pulley 8 and pulley 4 in FIGS. 2(a) and 2(b) are replaced, the same transmission can be obtained.

The distance between the side plates 3a and 3b of the pulley 4 is fixed, or the distance between the side plates 7a and 7b of the pulley 8 is fixed, and the opposite boob is configured as shown in FIG. 2(a), and at point IfMA in FIG. The prime mover 1, reduction gear 2, and pulley 4 are placed on the rotating table shown.

The rotary table A is supported so as to be rotatable in the direction of the arrow F or the opposite direction around a support shaft (provided in the center, but not shown) provided on the main body of the rotary table A.

When rotating the rotary table A in the direction of arrow F, the speed ratio decreases, and when rotating in the opposite direction, the speed ratio increases, resulting in a continuously variable belt transmission.

The device of the present invention is applied to the two types of known continuously variable belt transmissions mentioned above.

Next, details of the digital electromagnetic clutch device used in the device of the present invention will be explained with reference to FIG.

In FIG. 3, a lever 17a, a lever 17b, and a gear 17C are supported on a support shaft 17 mounted on the main body so as to be rotatable independently. Support shaft 1 provided on lever 17a
9a rotatably supports a gear 19b and an eccentric rotary wheel 19 which are integrally formed.

The circumference of the rotary ring 19 is covered with a rubber ring.

A magnetic net 23 is fixed to the lever 17a, and this magnetic path is closed by a U-shaped yoke 25 (fixed to the main body) made of annealed copper, so that it is strongly attracted and locked. An excitation coil 24 is attached to the yoke 25. Gears 19b and 1'7c are in mesh with each other. Lever 1
A gear 21 is supported on a support shaft 21a provided on the support shaft 21b, and a gear 21 is supported on the support shaft 2tJ. ) is rotatably supported. Note that the gear 21 meshes with the gears 17c and 20b. Symbol 22a is a rotating shaft serving as a driving source, and the rotating wheel 22 is fixed to this shaft. The spring 17 is the lever 1
It is hung between 7a and 17b.

As the rotating shaft 22a, the rotating shaft of the prime mover 1 or the rotating shaft driven thereby is used as an output shaft. Macnet 23a is fixed to lever 17b.

Yoke 25a1 Excitation coil 24a 11Yoke 2
5. It performs exactly the same function as the dynamic coil 24.

When the excitation coil 24 is energized for a short time, the resulting magnetic flux is in the opposite direction to that of the magnet 23, so the lever 17a is unlocked by the magnet 23, and the spring 17 causes the lever 17a to be locked. rotates counterclockwise, and the rotating wheel 19 is driven in contact with the rotating wheel 22. Rotating wheel 19fd moves left and right, so it is an idle wheel.

When the rotation N22 is rotating in the tense direction, the rotating wheel 19 is driven at a biting angle, and as the load on the output gear 170 becomes larger, the counterclockwise torque of the lever 17a increases due to its reaction. Increase the contact force of rotations 1111119 and 22. Therefore, even if the spring 17 is weak, it has the effect of increasing power transmission.

Therefore, it is possible to make the actuator 23 and the yoke 25 small and easy to move, and the energizing heavy seat of the excitation coil 24 can also be made small. At this time, the output gear 17c is rotating clockwise. When the rotary wheel 19 rotates once, the lever 17a reciprocates once and is locked by the yoke 25 again. Further, due to the rotation of the rotating wheel 19 at a slight angle, the rotating wheel 19 is separated from the rotating wheel 22, and power transmission is cut off.

As described above, by energizing the excitation coil 24,
Digitally, the gear 17C advances. The gear 17c rotates while it is energized, and when it stops, the gear 17c also stops.

When the excitation coil 24a is temporarily energized, the lever 17b is unlocked and the lever 17b is unlocked by the elastic force of the spring 17, similar to the case when the excitation coil 24 is energized.
b rotates clockwise, and the rotating wheels 20 and 22 are pressed against each other. Also, since the rotating wheel 20 rotates counterclockwise and the gear 21 rotates clockwise, the greater the load on the output gear 17c, the more the lever 17b receives clockwise rotational torque and rotates with the rotating wheel 22. 20 increases the pressure contact force. Therefore, there is an effect that power transmission is ensured. When the rotary wheel 20 rotates once, the lever 17b also makes one reciprocation, and the yoke 25a is turned again.
Then, by further rotation by a slight angle, it separates from the rotating wheel 22 and stops.

When the excitation coil 24a continues to be energized, the output gear 17c rotates, and when the excitation coil 24a is turned off, it automatically stops.

As can be seen from the above description, the output gear 17C rotates in either the forward or reverse direction in response to the energization of the excitation coil 24.24a. Since the output gear 17c rotates in either the forward or reverse direction depending on the energization pulse or the energization time of the excitation coil 24.24a, such a device is called a digital electromagnetic clutch. Although there are several similar devices possible in addition to this embodiment, the same object can be achieved by other means filed by the present applicant.

The components of the digital electromagnetic clutch are: first, an eccentric rotating wheel receives power transmission from the drive shaft;
Second, by energizing the excitation filter, the output gear is driven by the above-mentioned rotating wheel in units of one rotation;
Furthermore, in the case of this embodiment, the output gear can be driven in either the forward or reverse direction by using the first and second components described above.

In the device shown in FIG. 3, when the rotary wheel 22 rotates in either the forward or reverse direction, a well-known mechanism having an output shaft that always rotates in one direction regardless of whether the prime mover l rotates in the forward or reverse direction is used. It is sufficient to drive the rotary wheel 22 only in the clockwise direction. However, when the load is small, the spring 17 can be strengthened to drive the output gear 17c in the forward and reverse directions without using the biting angle even when the rotary wheel 22 rotates in the forward and reverse directions.

The yoke 25.25a allows the magnet 23.23a to
The levers 17, a and 17b were locked through the
Excitation coil 2 without using magnet 23.23a
4. By energizing 24a, lever 1 is directly activated by magnetic force.
7a117b can also be adsorbed and locked. In this case, the output gear 17c is driven by cutting off the current to the excitation coil 24.141a.

The rotation of the output gear 17c drives the load 18 via a reduction gear (not shown). The load 18 is indicated by the same symbol in FIG. 1, and the output of the load 18 is the actual f
As shown by 31D, it meshes with the gear 5 and rotates it in forward and reverse directions. The device shown in FIG. 3 is incorporated into a part of the speed reducer 2 shown in FIG. 1, and the rotating shaft 22a is driven by the part of the speed reducer. The output of the output gear 17C is transmitted to the load 18 as shown by the solid line C. Therefore,
It is clear that by controlling the energization of the excitation coils 24, 24a in FIG. 3, the speed ratio of the continuously variable belt transmission can be changed freely.

In addition, the load B in FIG. 3 is connected to the output gear 17c as shown by the dotted line E.
The object of the present invention can also be achieved by rotating the rotary table A in the direction of the arrow F by rotating the screw screw of the load B and moving the threaded screw.

The protrusion shown by the symbol 17d in FIG. 3 (provided on the lever 17b) has the following effects.

Due to an operation error or an accident, the levers 17a, 1
7b is unlocked at the same time, the rotating wheel 19
．． 20 are driven at the same time, and the output gear 17c is locked, with no means of release.

When the protruding portion 17d is present, the protruding portion 17d is connected to the lever 17a.
The above drawbacks are eliminated. That is, one of the levers 17a, 17b is locked by the yoke 25, 25a, and the non-locked lever is locked by the yaw after one movement.

Next, referring to FIG. 4, the energization control circuit for the excitation coils 24a and 24 will be explained. .

In FIG. 4, symbol 6 is a tachogenerator shown by the same symbol in FIG. 1, and an alternating current proportional to the load 100 rotational speed is obtained. The output of the tacho generator 6 is converted into a direct current by a rectifier circuit 26, and the output is input to a comparison circuit 27.

The resistor 28 serves as a volume, and is energized by a constant voltage power supply positive electrode 28a. The comparator circuit 27 has the output of a resistor 28 and a different volume input thereto. The output of the above-described volume is manually changed, and the output voltage is a voltage that commands the rotational speed of the load 10. Also resistance 2
8 may be omitted and a command voltage for setting the rotational speed from a numerical control device or computer may be input.

The electric motor 1 serving as the prime mover is driven by a forward/reverse circuit 1a constructed of a bridge circuit consisting of four well-known transistors.
Forward and reverse rotation is performed. That is, when the output of the device 1b that commands forward and reverse rotation is at a high level, the motor 1 rotates in the forward direction, and when the output is at a low level, it rotates in the reverse direction. Similar known means can be employed in the case of induction motors. It is also possible to command forward and reverse rotation of the electric motor 1 using a manual switch. In this case, by operating the manual switch in the forward or reverse direction, a circuit having a no-level or low-level output is provided correspondingly, and an AND circuit 30 described later is provided.
a z 30 b%... It is necessary to input them.

When the motor 1 is rotating in the normal direction, when the input voltage at the terminal 27b is increased in order to increase the rotational speed of the load 100, the output at the terminal 27Q of the comparator circuit 27 becomes the NO level. Since the two input voltages of the AND circuit 30a are both at a high level, the transistor 31 is made conductive by its output, the excitation filter 24 is energized, and the gear 5 shown in FIG. 1 is driven by the device shown in FIG. As a result, the gear ratio of the continuously variable belt transmission decreases, and the rotational speed of the load IO increases.

Therefore, when the input voltage of terminal 2'la in FIG. 4 increases and becomes equal to the input voltage of terminal 27b, the output of terminal 27C becomes a low level and the excitation coil 24 is de-energized. The gear ratio is maintained, and the load 10 also becomes the set rotational speed tail.

In the above case, even if the rotational speed of the electric motor 1 decreases, the situation remains the same, and the rotational speed of the load 10 is maintained at the initial value.

In order to reduce the rotational speed of the load IO, when the input voltage of the terminal 27b is dropped and held, the terminal 2 of the comparator circuit 27
Since the output of 7 d changes to high level, the output of AND circuit 30 b becomes high level, and transistor 31
Conducts a. Therefore, the excitation coil 24a is energized, and the gear 5 shown in FIG. 1 is rotated in the reverse direction by the device shown in FIG.
When the speed ratio of the continuously variable belt transmission device is increased and the rotational speed of the load 1O decreases, and the input voltages of the terminals 27a and 27b become equal, the output of the terminal 27d changes to a low level, so that the excitation coil 24 The energization of a is straddled. The load 10 is therefore driven at a reduced set speed.

The situation is the same when the rotational speed of the electric motor 1 increases or decreases, and the gear ratio of the continuously variable belt transmission is automatically changed, and the set speed of the load 10 is maintained.

The situation is exactly the same when constant speed control of the load 10 is performed by rotating the turntable A shown in FIG. 1, so a description thereof will be omitted.

When the electric motor 1 is reversed, the AND circuit 30a,
One input of 30b becomes low level, but the inverting circuit 2
One input of AND circuits 3υc and 3Ud via 9 becomes high level.

When the input voltage of the terminal 27b is increased in order to increase the set speed of the load 10, the output of the terminal 27c becomes the NO level, so the output of the AND circuit 30c also becomes the NO level, making the transistor 31a conductive. Then, the excitation coil 24a is energized. Therefore, gear 5 in FIG. 1 is driven in the forward direction to reduce the gear ratio of the continuously variable belt transmission.
The rotational speed of the load IO can be increased to the set value.

When the input voltage at terminal 2'/b is lowered in order to lower the set speed of load 10, the output voltage at terminal 27d will decrease.
Therefore, the output of the AND circuit 30d also becomes a high level, making the transistor 31 conductive, so that the gear ratio of the continuously variable belt transmission can be increased and the rotational speed of the load 1υ can be lowered to the set value. can.

When the two push button switches are used to energize the excitation coil 24 or 24a, the gear ratio of the continuously variable belt transmission can be increased or decreased only while the excitation coil 24 or 24a is energized. In this case, it is safe to configure the rotating ring 22 in FIG. 3 so that it rotates in one direction.

Also, as in the case of the Kallin engine, the rotating wheel 2 in Fig. 3
If the direction of rotation of 2 does not change, the control circuit of FIG. 4 is simplified as follows.

That is, symbol 1.1 aJ I J 29.30a in Figure 4
The members 130b, 30c, and 30d are omitted, and the outputs of the terminals 27c and 27d of the comparator circuit 27 are used as the base inputs of the transistors 31 and 31a, respectively.

In the apparatus of FIG. 3, 'w' by the yoke 25.25a
The object of the present invention can be achieved by using other electromagnetic devices as long as the L-rut locking device achieves the same purpose.

FIG. 5 shows another embodiment of the control circuit for the excitation coil 24.24a. Components with the same symbols as those in the previous embodiment are the same members, so a description thereof will be omitted.

The symbols 28.28a and 6.26 of the control circuit in FIG. 4 are removed, and the input circuit of the input terminals 27a and 27b of the comparison circuit 27 is changed as shown in FIG. 5(a).

In FIG. 5 1(a), the resistor 28 and the constant voltage terminal 28
The volume containing a is exactly the same as that of FIG. 4 with the ID"-symbol.

The volume indicated by the resistor 28b is the screwdriver 5 in FIG. 2(b).
The resistance changes in conjunction with C, and the input voltage at the terminal 27a changes. The gear ratio changes with the movement of the screw punch 5C, and the resistor 28b is changed so that when the gear ratio becomes sharper, the input voltage at the terminal 27a becomes sharper.

The manual dial for changing the output voltage of the volume controller including the resistor 28 has a gear ratio scale, so when the gear ratio is manually specified, the output voltage at the terminal 27C1 or the terminal 27d becomes 7. As explained above, when the gear ratio is changed to the required one, the terminals 27c and 27d
The output of is converted to low level. Therefore, the gear ratio can be changed by remote control.

FIG. 5(b) is an effective means for changing the gear ratio according to instructions from a computer.

In FIG. 5(b), reference numeral 32 is a reversible counting circuit, and the required number of electrical pulses is inputted from the computer through a terminal 32a and placed in the counting circuit 32.

While there is a residual count value, a command electrical signal is inputted from the above-mentioned computer so that the residual pulse detection circuit section is at a high level.

For example, in order to increase the gear ratio, the output from the terminal 32a becomes a certain level, and since this output is the base input of the transistor 31a in FIG. 4, the exciting coil 24a is energized and the gear ratio is increased. Therefore, lever 1 in FIG.
7b reciprocates in response to the rotation of the rotary wheel 20, and each reciprocation presses the actuator of the electric switch 36b to open and close it. Since the electric switch 36b has the same symbol as in FIG. 5(b), the counting circuit 32 is subtracted, and when the number of residual pulses becomes zero, the output of the residual pulse detection circuit 33 changes to a low level. Therefore, the energization of the excitation coil 24a is stopped, and the action of changing the gear ratio by the output gear 17C is also stopped.

As described above, it is possible to increase the gear ratio in accordance with the number of human power pulses at the terminal 32a.

When decreasing the gear ratio, by setting the input of the terminal 35b to high level, the output terminal 3 of the AND circuit 35
The output of 5a becomes high level. Since this output is the base input of the transistor 31 in FIG. 4, the exciting coil 24 is energized. Therefore, the lever 17 in FIG.
a reciprocates, and the gear ratio is reduced by the output gear 17e. Also, the electric switch 36a in FIG. 3 is the lever 17.
For each reciprocation of a, the actuator is pressed by the lever 17a to open and close, so the electric switch with the same symbol in FIG. When the numerical value becomes zero, the output of the AND circuit 3b becomes low level, and the change of the gear ratio is stopped.

As described above, there is an advantage that the speed ratio can be freely changed by input signals from the terminals 32a, 34b, and 35b.

In the embodiment of FIG. 5(b), the rotating wheel 22 of FIG.
is applied when rotation is in one direction. It's loud again,
A circuit for obtaining the base input of transistors 31 and 31a in FIG. 4 is not required.

As explained in each embodiment, according to the present invention, the object stated at the beginning is achieved and the effects are significant.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of the device of the present invention, FIG. 2 is an explanatory diagram of a part thereof, FIG. 3 is an explanatory diagram of a digital electromagnetic clutch, and FIG. 4 is a control circuit diagram of the device of the present invention. FIG. 5 similarly shows control circuit diagrams of other embodiments. 1... Prime mover, 2.9... Reduction gear device, 4.8.
...Boo 1ha 3a13b17a17゛b...Side plate,
A... Turntable, 18, B... Digital electromagnetic clutch, 5... Gear, 1 (1-- Load, 4 a, 8 a, 22
a-・Rotation axis, 12.17...Spring, 13.1
4... Spline, 11... Belt, 3.7... Hole, 5C... Screw punch, 5b... Threaded part, 15.16.
・・Ball bearing, 17.19a, 20a-・・
Support shaft, 17a, 17b-lever, 19.20.22
... Rotating wheels, 19b, 20b. 17c, 21... Gear, 23.23a... Magnet, 25.25a... Yoke, 24.24 a.
・Exciting coil, 28.28b...Resistance (volume)
, 6... Tacho generator, 26... Rectifier circuit, 2
7... Comparison circuit, 1a... Forward/reverse circuit, 1b...
Device for instructing change of gear ratio, 29...inversion circuit, 3Ua, 30b, 30c, 30d134.
35...AND circuit, 31.31a...transistor, 32...reversible counting circuit, 36a% 36b・
...Electric switch, 33...Residual pulse detection device. Funeral 3 diagram

Claims (2)

[Claims] (1) In a transmission that performs continuously variable speed by centering the distance between the axes of a belt that is hung between a first pulley driven by a prime mover and a second pulley that drives a load, a moving device that moves the prime mover and the first pulley so that the distance between the first and second pulleys is changed;
Through the energization of the second excitation coil, the first and second idler wheels, which respectively move in contact with the output shaft of the prime mover, are activated, and when the first idler wheel is in contact with the output shaft and receives power transmission, the Turn,
Driving the moving device through the rotation of the output gear and a digital electromagnetic clutch device equipped with an output gear that is reversed when the second idler wheel contacts the output shaft and receives power transmission, A device for changing the distance between the shafts, a device for detecting the rotational speed of a load, a device for generating a command electric signal for specifying the rotational speed of the load, an output electric signal of the device, and a device for detecting the rotational speed as described above. Compare the output electrical signals of the device and, in relation to the difference between the former and latter electrical signals,
a comparison circuit that obtains first and second outputs, and a first
The output of the digital electromagnetic clutch device energizes the first or second excitation coil included in the digital electromagnetic clutch device, and the output of the output gear reduces the distance between the shafts and the gear ratio. The output of the digital electromagnetic clutch device energizes the first or second excitation coil included in the digital electromagnetic clutch device, and the output of the output gear increases the distance between the shafts and the gear ratio. , a control circuit that stops energizing the first or second excitation coil when the second output disappears, and maintains the change in the center distance in that state. Belt transmission. (2) A belt placed between the first pulley driven by the prime mover and the second pulley driving the load, and one side plate of each of the first and second pulleys connected to the rotating shaft. In a continuously variable transmission device that performs continuously variable transmission by moving in the direction and changing the effective diameters of the first and second bobbles,
A spring that elastically rebounds one side plate of the second pulley to increase its effective diameter, and a spring that moves one side plate of the first pulley left and right in the direction of the rotation axis to increase or decrease its effective diameter. The first idler wheel is brought into contact with the output shaft of the prime mover through the side plate moving device and the first and second idler wheels that move toward and away from the output shaft of the prime mover, respectively, through the energization of the first and second B: + wheels. A digital electromagnetic lante device including an output gear that rotates in the normal direction when the second idler wheel contacts the output shaft and receives power transmission, and rotates in the reverse direction when the second idler wheel contacts the output shaft and receives power transmission, and the rotation of the output gear described above. A drive device that drives the side plate moving device described above to increase or decrease the effective diameter of the first pulley in response to forward and reverse rotation of the output B1 wheel, a rotation speed detection device for the rotation speed of the load, and a rotation speed detection device for the rotation speed of the load. Compare the output electrical signal of the device that generates the command electricity (m number) for specifying the rotational speed with the output electrical signal of the above-mentioned rotational speed detection device, and determine the difference between the former and latter electrical signals. The first and second outputs are connected to a comparator circuit, and the first output of the circuit is used to generate a digital camera.
The first or second excitation coil included in the crunch device is energized The first or second excitation coil included in the digital electromagnetic launch device is energized by the second output of the comparison circuit, and its output is The control circuit is characterized by comprising a control circuit that stops the energization of the first and second excitation coils in response to the output of the gear, thereby stopping and holding the movement of the side plate of the first pulley. Continuous belt transmission device.