JPH0565736B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a signal transmission device between a continuously variable transmission capable of continuous speed change operation and a torque detector capable of continuously detecting torque fluctuations. .

(Prior Art) A signal transmission device that continuously transmits torque fluctuations to a continuously variable transmission as disclosed in the present invention has not been provided to date.

(Problems to be Solved by the Invention) The biggest problem with continuously variable transmissions for automobiles that are currently in practical use is to maintain a balance between generated torque and smooth running conditions.

In view of the above, an object of the present invention is to provide a device that can continuously sense fluctuations in axle torque and transmit appropriate signals to a transmission so as to ensure smooth running.

(Means for Solving the Problems) In order to achieve the above object, the gist of the present invention is to provide a signal transmission device for differentially driving a continuously variable transmission according to a displacement detected by a torque detector. hand,
The differential transformer on the receiver 2 side of the balanced differential transformer A consists of a balanced differential transformer A, a switch mechanism B, an angle sensor C, an axle rotation speed sensor D, and an axle weight sensor E. The direction of the differential voltage at _T2 is determined by a switch mechanism B consisting of a rotary switch 7, a stopper 8, and a weight 9, which is applied to the differential transformer on the transmitter 1 side, which is generated in response to the displacement detected by the torque detector.
The differential voltage of _T1 is configured to be constant regardless of the direction, and the difference on the transmitter 1 side is determined by signals sent from the angle sensor C, axle rotation speed sensor D, and axle weight sensor E. Coil S ₁ of dynamic transformer T ₁ ,
The signal transmission device is characterized in that only _S2 is configured to be movable.

(Function) Torque fluctuation factors in automobiles include downhill driving (engine braking), uphill driving, acceleration driving, and changes in loaded weight.

When driving downhill with engine braking, the torque fluctuation is in the decreasing direction, which is opposite to the torque fluctuation (increasing direction) when accelerating on a flat road.
A differential voltage with an opposite direction is generated on the oscillator 1 side. Therefore, as it stands, the direction of the differential voltage generated on the receiver 2 side will be opposite to the direction of travel (torque increasing direction). That is, the direction of displacement of the movable iron piece 3b on the side of the receiver 2 is opposite between the movement of and the movement of . In this case, in order to keep the displacement direction of the movable iron piece on the receiver 20 side constant, a device is required to reverse the generation direction of the differential voltage on the transmitter side and transmit it to the receiver side.

When traveling uphill, sufficient force is required to climb the hill, so a device is required that allows the reduction ratio to be relatively large compared to when traveling on a flat road.

A device that increases the reduction ratio until the vehicle reaches a certain speed (for example, 30 km/h) so that smooth acceleration occurs when the axle rotation is low, such as when starting. is necessary.

When the loaded weight increases, running resistance increases in proportion to the weight, so a device that can increase the reduction ratio to obtain sufficient power and run stably is required.

When the vehicle changes from the above-mentioned ~ (torque increase) to downhill travel (torque decrease), the direction of the differential voltage generated on the transmitter side is reversed. However, since the present invention includes a switch mechanism B consisting of a rotary switch 7, a stopper 8, and a weight 9, the difference in the differential transformer _T1 on the transmitter 1 side that occurs in response to the displacement detected by the torque detector is Regardless of the direction of the dynamic voltage, the movable iron piece 3b on the receiver 2 side is displaced so that a differential voltage in a certain direction is generated in the differential transformer _T2 on the receiver 2 side, and this displacement is eliminated. The speed is transmitted to the gear transmission and decelerated by a predetermined amount.

In addition, when driving uphill, if the angle of the slope exceeds a certain angle, the angle sensor C will sense it and generate a signal, and when driving under acceleration, the axle rotation speed sensor D will sense it when the rotation speed is below a certain setting. Then, when the loaded weight exceeds a certain value, the axle weight sensor E senses it and generates a signal, and each of the above signals triggers the differential on the transmitter 1 side of the balanced differential transformer. Only the coil of the transformer _T1 is moved to generate a differential voltage, and the receiver 2 is connected so that a differential voltage is generated in the opposite direction to the transmitter 1 side on the receiver 2 side.
The side movable iron piece 3b is displaced, and this displacement is transmitted to the continuously variable transmission to perform a predetermined amount of deceleration.

(Example) An example of the present invention will be described with reference to the drawings.

Fig. 1 is an overall configuration diagram of a balanced differential transformer A and a switch mechanism B of a signal transmission device according to the present invention. They have similar configurations, T ₁ and T ₂ are differential transformers, 1 is a transmitter, and 2 is a receiver. 3
a and 3b are movable iron pieces, and the movable iron piece 3a of the transmitter 1 is connected to a sensor of a torque detector (not shown, for example, a ring-shaped metal fitting disclosed in Japanese Patent Application Laid-Open No. 62-240825). . The movable iron piece 3b of the receiver 2 is connected to a continuously variable transmission (not shown). S ₁ and S ₂ are secondary coils of the transmitter 1, S ₃ and S ₄ are secondary coils of the receiver 2, 4 is an amplifier, 5 is a servo motor, and 6 is an AC power source.

The switch mechanism B, which is a feature of the present invention, includes a rotary switch 7, left and right stoppers 8, and a weight 9.
It consists of This weight 9 makes a pendulum movement within a range regulated by left and right stoppers 8 around a swing shaft 9a fixed to the vehicle body. The angle Θ ₀ of the pendulum movement of the weight 9 may be set to the angle of the slope (downhill direction) on which it is desired to operate the continuously variable transmission and decelerate by a predetermined amount. Further, the weight 9 is engaged with a rotating member 7a of the rotary switch 7.

S ₁ ′, S ₂ ′, S ₃ ′, S ₄ ′, S ₃ ″, and S ₄ ″ are wiring contacts connecting the rotary switch 7 and the coil S ₁ , S ₂ , S _{3 ,} or S ₄ . In the state shown in the figure, transmitter 1
Based on the voltage generated in the secondary coils S ₁ and S _{2 of}
Conductivity is established between S ₁ ′ and S ₃ ′ and between S ₂ ′ and S ₄ ′. When the weight 9 rotates by Θ ₀ in the direction of the arrow from the state shown in the figure, the rotating member 7a engaged with the weight 9 rotates by Θ in the direction of the arrow, and at the same time the rotary switch 7 also rotates by Θ in the direction of the arrow. the result,
Bifurcated member 1 in contact with the rotary switch
0 and 11 rotate in the direction of the arrow, and the electrical connection between the contacts S ₃ ′ and S ₄ ′ and the rotary switch 7 is cut off.
Contacts S ₃ ″ and S ₄ ″ are electrically connected to the rotary switch.

In the device shown in FIG. 1, the movable iron piece 3a on the receiver 1 side is displaced in conjunction with the sensor of the torque detector, and a differential voltage corresponding to the amount of displacement is generated.
Occurs between S ₁ ′ and S ₂ ′. The direction of this differential voltage changes depending on the direction of displacement of the movable iron piece 3a, that is, the direction of torque fluctuation. However, since the present invention includes a switch mechanism B consisting of a rotary switch 7, a stopper 8, and a weight 9, a differential voltage in a fixed direction is generated in the receiver 2 regardless of the direction of the differential voltage generated in the transmitter 1. can be done.

As mentioned above, uphill running, acceleration running, increase in loaded weight, etc. increase the torque, and in this case, if the movable iron piece 3a of the transmitter 1 is displaced toward the S ₁ coil, the coils S ₁ and S ₂ The voltages e ₁ and e ₂ are generated respectively (however, e ₁ > e ₂ ). Since contact S ₁ ′ is connected to S ₃ ′ and contact S ₂ ′ is connected to S ₄ ′,
On the receiver 2 side, the movable iron piece 3b moves to the S 4 coil side so that the voltage ( _{e 4 )} generated on the S ₄ coil side is S ₃ Voltage generated on the coil side (e ₃ )
becomes larger than In this way, the displacement of the movable iron piece 3b stops when the voltages generated in the coils S ₃ and S ₄ on the receiver 2 side eventually become equal.

Since the torque decreases when traveling downhill, the movable iron piece 3a of the transmitter 1 is displaced to the _S2 coil side,
Voltages e ₁ and e ₂ are generated in the coils S ₁ and S ₂ , respectively (however, e ₂ > e ₁ ). The angle of this downhill slope is weight 9
If the swingable angle is greater than or equal to Θ ₀ , the weight 9 swings by an angle Θ ₀ in the direction of the arrow in the figure, and in response, the rotating member 7a of the rotary switch 7 rotates by Θ in the direction of the arrow in the figure. As a result, the conduction between the contacts S ₃ ′, S ₄ ′ and the rotary switch 7 is cut off, and the members 10 and 11 rotate in the direction of the arrow in the figure, so that the contacts S ₃ ″,
S ₄ ″ conducts with the rotary switch. Contact S ₃ ″
Since _{the contact point S 4 ″} is connected to S ₁ ′,
In this case as well, the movable iron piece 3b on the receiver 2 side moves to the _S4 coil side, and the voltage (e ₄ ) generated in the _S4 coil
becomes larger than the voltage (e ₃ ) generated in the S ₃ coil, producing a voltage in the opposite direction to the differential voltage being sent. In other words, the movable iron piece is adjusted so that the voltage generated in the S ₄ coil on the receiver 2 side is greater than the voltage generated in the S ₃ coil, whether the vehicle is traveling in the direction of increasing torque or in the direction of decreasing torque (driving downhill). 3
b is displaced. The direction of displacement of the movable iron piece 3b does not change whether the moving iron piece 3b is traveling in the direction of increasing torque (uphill driving, acceleration, increased loading weight) or in the direction of decreasing torque (running downhill), so the direction of displacement of the movable iron piece 3b is If the deceleration direction is set to match the deceleration direction, deceleration is possible even when traveling downhill, and if the inclination angle of the downhill slope becomes steep, the movable iron piece 3
Since the displacement of b also increases, the deceleration ratio also increases and safe driving is ensured.

Figure 2 shows the differential transformer T ₁ of transmitter 1 in Figure 1.
This is a device in which the coils S ₁ and S ₂ of 1 are movable together with the cylindrical container 12 independently of the movable iron piece 3a.
3 is a solenoid coil, 14 is a spring, 15
is a hydraulic buffer box. The hydraulic buffer box 15 is configured to ease the movement of the cylindrical container 12. However, although the use of electromagnets as a mechanism for moving the coils S ₁ and S ₂ of the differential transformer on the transmitter 1 side has a simple mechanism, it has the disadvantage of a short stroke.
When it is necessary to take a large stroke due to the design balance, it is necessary to use a combination of a hydraulic cylinder and a solenoid valve.

FIG. 3 is a configuration diagram of the angle sensor C, in which the weight 26 swings at a certain angle Θ ₁ while traveling uphill.
In this case, the structure is such that the contact member 16 comes into contact with the contact 17.

Figure 4 is a configuration diagram of the axle rotation speed sensor D.
8 has a structure that is connected to an axle (not shown) and rotates in synchronization, and two arms 19 are supported on the shaft 18 so that they can expand and contract (expand in the direction of the arrow in the figure and contract to the current position). furthermore, the arm 19 is connected to the member 20
The member 20 is connected to the short shaft 21 . Reference numerals 22, 23, and 24 are a disc spring, a contact member, and a contact, respectively, which are attached to the short shaft 21. axis 18
As the rotational speed of the arm 19 increases, the arm 19 tends to spread outward, so that the member 20 is pushed to the left in the figure and the contact member 23 contacts the contact 24. In this case, by changing the spring force of the disc spring 22, the number of rotations at which the contact member 23 contacts the contact 24 can be changed.

FIG. 5 is a block diagram of the axle weight sensing device E. If the weight exceeds a certain set value, the weight sensor 25
It is configured to be energized.

The angle sensor, axle rotation speed sensor, axle weight sensor, etc. are connected to the solenoid coil 13 shown in FIG. is sent or
When the weight reaches a certain level and a signal is emitted from the axle weight sensor, a current flows through the solenoid coil 13, and the cylindrical container 12, together with coils S ₁ and S ₂ , is moved to the solenoid coil 13 side by the magnetic force induced in the solenoid coil 13. When the signal is cut off, the spring force of the spring 14 returns it to its original position.

In the case of an axle rotation speed sensor, when the engine starts, the solenoid coil 13 is energized and the cylindrical container 12
is solenoid coil 13 along with coils S ₁ and S ₂
When the contact member 23 and the contact point 24 reach a certain rotation speed, the contact member 23 and the contact point 24 come into contact with each other by the operation described above. At this time, the current supply circuit to the solenoid coil 13 is cut off, and the cylindrical container 12 is returned to its original position together with the coils S ₁ and S ₂ by the spring force of the spring 14 .

As described above, the cylindrical container 12 is coiled by the operation of the angle sensor, the axle rotation speed sensor, and the axle weight sensor.
By being attracted to the solenoid coil 13 side together with S ₁ and S ₂ , the movable iron piece 3a is connected to the coil S ₁
A similar movement to the side occurs, and a differential voltage is generated in the coil on the transmitter 1 side. Correspondingly, on the receiver 2 side, the movable iron piece 3b is displaced so that a differential voltage in the opposite direction to the differential voltage on the transmitter 1 side is generated. In this case, the movement is in the direction of increasing torque, and the voltage generated in the S ₁ coil is greater than the voltage generated in the S ₂ coil, so as described above, on the receiver 2 side, the voltage generated in the S ₄ coil is increased. is greater than the voltage generated in the S ₃ coil,
The movable iron piece 3b is displaced to the _S4 coil side. In conjunction with this displacement, the continuously variable transmission operates in the deceleration direction. By operating these sensors, a predetermined deceleration is performed even when the vehicle is uphill, at low speeds, or when the vehicle is loaded with a large load, allowing the vehicle to enjoy smooth running.

(Effects of the Invention) Since the present invention is configured as described above, it has the following effects.

The switch mechanism and torque sensor are constructed by combining general-purpose devices with a simple structure, so it is possible to drive safely by continuously responding to torque fluctuations while driving, and it is possible to drive safely when driving on a slope, when accelerating from a start, and when changing the loaded weight. You can enjoy safe and smooth driving by responding appropriately to such problems.

[Brief explanation of drawings]

FIG. 1 is an overall configuration diagram of a balanced differential transformer A and a switch mechanism B according to the present invention, FIG. 2 is a configuration diagram of a coil moving device on the transmitter side of FIG. 1, and FIG. 3 is an angle FIG. 4 is a block diagram of the sensor C, FIG. 4 is a block diagram of the axle rotation speed sensor D, and FIG. 5 is a block diagram of the axle weight sensor E. 1... Transmitter, 2... Receiver, 3a, 3b...
Movable iron piece, 7...rotary switch, 8...stopper, 9...weight, _T1 , _T2 ...differential transformer,
S ₁ , S ₂ , S ₃ , S ₄ ...Coil.

Claims (1)

[Claims] 1. A signal transmission device for operating a continuously variable transmission in response to displacement detected by a torque detector, which comprises: a balanced differential transformer A, a switch mechanism B, and an angle sensor C. , axle rotation speed sensor D, axle weight sensor E
The direction of the differential voltage of the differential transformer T2 on the receiver ₂ side of the balanced differential transformer A is determined by the torque detector by a switch mechanism B consisting of a rotary switch 7, a stopper 8, and a weight 9. Differential transformer on the transmitter 1 side that generates in response to the displacement detected by
The differential voltage of _T1 is configured to be constant regardless of the direction, and the difference on the transmitter 1 side is determined by signals sent from the angle sensor C, axle rotation speed sensor D, and axle weight sensor E. Coil S ₁ of dynamic transformer T ₁ ,
A signal transmission device characterized in that only S ₂ is configured to be movable.