JPH11230494A - Traction oil supplying device for toroidal type continuously variable transmission - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the generation of damage in a contact part by supplying the traction oil near a contact point in the case where each part of a toroidal type transmission mechanism is rotated in the condition that each traction surface of an input and an output disks and a peripheral surface of a power roller directly contact with each other without providing an oil film. SOLUTION: A piston 2 is installed in a cylinder chamber 1, and the piston 2 is energized in one way by an elastic body 3 so as to pressurize the traction oil housed between the piston 2 and the cylinder chamber 1. A feeding screw mechanism 6 is threaded with a screw crest 50 of an outer end of a piston shaft 5 connected to the piston 2, and the feeding screw mechanism 6 is rotated by a motor 9 so as to feed the piston shaft 5, and the piston shaft 5 is locked with a stopper 12 at the predetermined feeding position. At the time of operating an engine for starting, lock of the stopper 12 is released by a solenoid 11, and the traction oil pressurized by the elastic body 3 is fed to appropriate positions of the toroidal type transmission mechanism.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a toroidal type continuously variable transmission used as a transmission for an automobile, for example, when an input disk and an output disk are used when the toroidal type transmission mechanism is rotated with a so-called oil film shortage. The present invention relates to a traction oil supply device for a toroidal-type continuously variable transmission that prevents the traction surface and the peripheral surface of a power roller from being damaged by friction.

[0002]

2. Description of the Related Art Toroidal type continuously variable transmissions, which have been mainly studied as transmissions for automobiles, include an input disk and an output disk each having a concave section having an arc-shaped concave surface facing each other. At least one toroidal transmission mechanism having a structure in which a plurality of rotatable power rollers sandwiched between the disks are combined. The input disk is locked and mounted so as to be integrally rotatable with respect to the torque input shaft and restricted from moving in the direction of the torque input shaft, while the output disk is mounted relatively to the torque input shaft. It is mounted opposite the input disk so as to be rotatable and restricted from moving away from the input disk.

[0003] In the toroidal-type transmission mechanism described above,
When the input disk rotates, the output disk rotates in the reverse direction via the power roller, so that the rotational motion input to the torque input shaft is transmitted to the output gear coupled to the output disk as a rotational motion in the opposite direction and is taken out from the output shaft. It is. At this time, the inclination from the torque input shaft to the output gear is increased by changing the inclination angle of the rotating shaft of the power roller so that the peripheral surface of the power roller comes into contact with the vicinity of the outer periphery of the input disk and the vicinity of the center of the output disk, respectively. Conversely, the torque input shaft is changed by changing the inclination angle of the rotation shaft of the power roller so that the peripheral surface of the power roller comes into contact with the vicinity of the center of the input disk and the vicinity of the outer periphery of the output disk, respectively. From the output gear to the output gear. Further, an intermediate speed ratio between the two can be obtained almost steplessly by appropriately adjusting the inclination angle of the rotating shaft of the power roller.

In the toroidal transmission, the transmission of the driving force between the input disk and the power roller and between the power roller and the output disk is performed through frictional contact. Therefore, the traction surfaces of the input disk and the output disk and the periphery of the power roller. The surface of the metal of each member is protected by forming an oil film between the surface and the surface. These oil films are constantly re-formed by guiding traction oil delivered from a supply pump driven by a prime mover such as an engine to a traction surface of a toroidal type transmission mechanism.

[0005] In a drive system of an automobile that performs automatic shifting, it is necessary to gradually increase the magnitude of driving torque transmitted from a prime mover such as an engine to an axle on which driving wheels are mounted when starting and gradually decreasing when stopping. For this reason, there is provided a starting mechanism for switching the torque intermittent state at the time of starting and stopping. In the case of vehicles equipped with a toroidal-type continuously variable transmission as an automatic transmission, a starting mechanism that changes the magnitude of driving force via hydraulic oil, such as a wet multi-plate clutch or a torque converter, is often used. , From the prime mover such as an engine to the input disk of the toroidal transmission, or from the output disk of the toroidal transmission to the drive wheels. Therefore, in a toroidal-type continuously variable transmission in which the starting mechanism is provided between the toroidal-type transmission mechanism and the drive wheels, each part of the toroidal-type transmission mechanism always rotates with the prime mover, while the starting mechanism is between the prime mover and the toroidal-type transmission mechanism. In the toroidal type continuously variable transmission provided in the above, each part of the toroidal type transmission mechanism always rotates together with the drive wheels.

[0006]

The traction oil forming the oil film between each traction surface of the toroidal type transmission mechanism and the peripheral surface of the power roller drops little by little with the passage of time under the influence of gravity. Because of these aspects,
It gradually changes to a so-called oil film break state. As a result, the oil film between each traction surface and the peripheral surface of the power roller is completely disappeared in the toroidal-type continuously variable transmission mounted on a car that has been left for a long time with the motor stopped. The metal members of the input disk, the output disk, and the power roller are in direct contact with each other.

As described above, when a toroidal transmission mechanism of a vehicle that has been left for a long time starts to rotate,
The metal of the input disk, the output disk, and the power roller that are in contact with each other without passing through the oil film are directly rubbed against each other. In the traction section of a toroidal transmission that is operated under conditions of high temperature and high surface pressure, minute damage to the surface of the member formed by such direct contact rotation with the oil film shortage is the starting point, and surface separation occurs. There is a high risk of serious problems such as reducing the durability of the entire toroidal type continuously variable transmission.

For example, in the case of a toroidal type continuously variable transmission in which the starting mechanism is provided between the toroidal type transmission mechanism and the drive wheels,
When the prime mover is started, each part of the toroidal type transmission mechanism is forcibly rotated by the prime mover before the oil supply pump starts to operate stably, so that the above-described problem of direct contact between the members occurs. Also, in the case of a toroidal type continuously variable transmission in which the starting mechanism is provided between the prime mover and the toroidal type transmission mechanism, oil is supplied when driving wheels are rotated from the outside while the prime mover is stopped due to traction or the like. Each part of the toroidal transmission mechanism is forcibly rotated by the friction torque of the drive wheels without the pump being driven,
Again, the above-described problem of direct contact between the members occurs.

The present invention has been made in view of the above circumstances, and has been made in a state where the traction surfaces of the input disk and the output disk and the peripheral surface of the power roller are in direct contact with each other without an oil film. Provided is a traction oil supply device for a toroidal-type continuously variable transmission that prevents damage to a traction surface and a peripheral surface of a power roller by supplying traction oil around a contact point when each part of the toroidal transmission mechanism is rotated. With the goal.

[0010]

SUMMARY OF THE INVENTION The present invention relates to a traction oil supply device for a toroidal type continuously variable transmission, and an object of the present invention is to pump traction oil to a traction surface of a toroidal type transmission mechanism. A traction oil supply pump, and a starting mechanism disposed between the toroidal-type transmission mechanism and the drive wheels for switching between intermittent torque at start and stop. When the traction oil is supplied, the traction oil supply device of the toroidal type continuously variable transmission supplies traction oil to the traction surface of the toroidal type transmission mechanism before the output shaft of the prime mover actually starts rotating. Is achieved.

It is another object of the present invention to provide a traction oil supply pump for pumping traction oil to a traction surface of a toroidal type transmission mechanism and a starter disposed between an output shaft of a motor and the toroidal type transmission mechanism. And a starting mechanism for switching the torque intermittent at the time of stop and stop, is incorporated in the toroidal type continuously variable transmission, and when the driving wheels are rotated from the outside with the motor stopped, the toroidal type transmission mechanism This is also effectively achieved by a traction oil supply device of a toroidal type continuously variable transmission that supplies traction oil to a traction surface.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The traction oil supply device of the present invention is incorporated in a toroidal type continuously variable transmission provided with a traction oil supply pump for pumping traction oil to the vicinity of a traction surface of a toroidal type transmission mechanism. Operates independently of the oil supply pump. Hereinafter, each configuration example in the case where the traction oil supply device of the present invention is applied to a vehicle having an internal combustion engine such as an engine as a prime mover will be described. The configuration of the present invention is roughly classified into two types according to the position where the starting mechanism for switching the torque intermittent at the time of starting and stopping is provided.

[0013] In the case of a traction oil supply device in which the starting mechanism is incorporated in a toroidal-type continuously variable transmission arranged between the toroidal-type transmission and the drive wheels, each of the toroidal-type transmissions when the prime mover is started. In order to prevent the member surface from being damaged, traction oil is supplied to the toroidal transmission mechanism from the time the driver starts the operation of the prime mover such as the engine until the rotation of the output shaft of the prime mover is actually started. Supply near the traction surface. Therefore, this type of traction oil supply device requires a sensor connected to the ignition switch and oil delivery means for delivering a predetermined amount of traction oil in a short time. As the oil delivery means, for example, an electric pump, an accumulator, a cylinder held in a compressed state, or the like can be used.

In a configuration example using an electric pump as the oil delivery means, a pressure pump driven by a motor is arranged near the traction surface of the toroidal transmission mechanism. When the operation of the ignition switch is detected by the sensor when the engine or the like is started, the motor is energized to operate the pressure pump, so that the oil film is formed before the toroidal transmission mechanism starts rotating. Dispense an amount of traction oil around the traction surface. At this time,
If the power supply to the starter motor is performed after approximately 1 to 2 seconds have elapsed from the energization of the pressure pump, a time lag can occur before the output shaft of the engine or the like actually starts rotating. As a result, an oil film is reliably formed on the traction surface and the peripheral surface of the power roller of the toroidal transmission mechanism that rotates integrally with the output shaft of the engine or the like before starting.

In the configuration example using the accumulator as the oil delivery means, the accumulator is arranged near the traction surface of the toroidal type speed change mechanism. A part of the traction oil delivered from the traction oil supply pump is introduced in advance to the accumulator connected in the middle of the traction oil passage during normal running, and when the appropriate traction oil pressure is generated, the accumulator is The valve that can be controlled to open and close provided at the discharge port is closed. For this reason, even after the engine or the like is stopped, the storage pressure state having high traction oil pressure is maintained in the accumulator for a long period of time. When the operation of the ignition switch is detected by the sensor the next time the engine or the like is started, the accumulator discharge port valve is opened to immediately release the hydraulic pressure generated in the accumulator. The traction oil delivered from the accumulator discharge port by its own pressure is supplied to the vicinity of the traction surface of the toroidal type speed change mechanism to form an oil film. Therefore, when the output shaft of the engine or the like starts rotating, the metal surfaces of the members of the toroidal transmission mechanism do not directly rub against each other. In this configuration example as well, the reliability of the formation of the oil film may be increased by generating a delay time of about several seconds from the opening of the discharge port valve to the supply of power to the starter motor.

In a configuration example in which a cylinder held in a compressed state is used as an oil delivery means, a cylinder chamber 1 having a built-in elastic body 3 such as a spring and a piston 2 as shown in FIG. Is provided. The piston 2 is fitted in a cylinder chamber 1 for storing traction oil, and an elastic body 3 such as a spring is arranged between the back surface of the piston 2 and the inner wall of the cylinder chamber 1 so as to be able to expand and contract. At the end of the piston shaft 5 extending from the through hole 4 formed in the cylinder chamber 1 to the outside, a screw thread 50 to be screwed with the feed screw mechanism 6 is formed. A screw feed gear 8 is connected via a clutch 7. Since the screw feed gear 8 meshes with a drive gear 10 that is drivingly connected to an output shaft of a motor 9, by controlling the power supplied to the motor 9, the feed screw mechanism 6 moves the piston shaft 5. The feeding amount can be adjusted. A jaw 51 is provided at an intermediate portion of the piston shaft 5 so as to be engaged with a stopper 12 driven by the solenoid 11 in a vertical direction.

The driving of the motor 9 is performed by using surplus electric power during normal running. When the feed screw mechanism 6 operates according to the rotation of the drive gear 10, the piston shaft 5 receiving the thrust from the screw thread 50 is pushed toward the cylinder chamber 1 and compresses the elastic body 3 such as a spring. Since the cylinder chamber 1 is connected to an oil passage for traction oil via an entrance formed in the side wall, when the piston shaft 5 is pushed in and the volume of the cylinder chamber 1 increases, the traction oil is discharged into the cylinder chamber 1. Flows into. When the feeding of the piston shaft 5 reaches a predetermined amount, the solenoid 11 is energized to push down the stopper 12 and engage with the jaw 51 of the piston shaft 5 so that the elastic body 3 such as a spring is normally moved during normal running. Can be created in advance. This compression state is not lost even after stopping the engine etc.
High sending power based on the repulsive force of the elastic body 3 such as a spring is maintained for a long period of time.

When the operation of the ignition switch is detected by the sensor when the engine or the like is started next time, the solenoid 11 is energized to pull up the stopper 12, thereby immediately releasing the cylinder output. Traction oil discharged from the inlet / outlet of the cylinder chamber 1 whose volume is rapidly reduced by the movement of the piston 2 subjected to the repulsive force of the elastic body 3 such as a spring is deposited around the traction surface of the toroidal type transmission mechanism and the periphery of the power roller. Supplied to form an oil film. When the piston 2 receiving the repulsive force from the elastic body 3 such as a spring is pushed out of the cylinder chamber 1 to reduce the volume of the cylinder chamber 1, the feed screw mechanism 6 idles due to the action of the one-way clutch 7. The screw feed gear 8 and the motor 9 do not hinder the movement of the piston shaft 2 along the axial direction.

In the case of a traction oil supply device in which the starting mechanism is incorporated in a toroidal-type continuously variable transmission disposed between the prime mover and the toroidal-type transmission, the toroidal-type transmission is rotated with the prime mover stopped. In order to prevent the surface of each member from being damaged when the drive wheels are rotating, the traction oil is continuously supplied to the vicinity of the traction surface of the toroidal transmission mechanism. Therefore,
In this type of traction oil supply device, oil delivery means for constantly delivering a predetermined amount of traction oil is required. As the oil delivery means, an electric pump, a mechanical pump, or the like can be used.

In a configuration example using an electric pump as the oil delivery means, a rotation sensor is connected to the drive wheels or the drive shaft, and a pressure-feed pump driven by a motor is arranged near the traction surface of the toroidal transmission mechanism. When the rotation sensor detects that the rotation of the drive wheels has started while the engine or the like is stopped, such as when the vehicle is being towed, the motor is energized and the pump is operated, so that the amount required for oil film formation is obtained. Out the traction oil around the traction surface. The power supply to the motor that operates the pump is continuously performed while the toroidal transmission mechanism is rotating, and is stopped only when the rotation sensor detects that the driving wheels are still for a certain period of time or more.

In a configuration example in which a mechanical pump is used as the oil delivery means, a power extraction unit is arranged between the starting mechanism of the drive system and the drive wheels. The power extraction unit extracts a part of the torque input from the drive wheels and transmits the torque to a mechanical pump. When the vehicle advances due to externally applied force during towing, etc., the drive wheels are rotated while the engine etc. are stopped, so the drive power automatically distributed by the power extractor activates the mechanical pump As a result, an amount of traction oil necessary for forming an oil film is sent out around the traction surface. In this configuration example, the mechanical pump automatically starts operating in response to the rotation of the drive wheel receiving the frictional force from the road surface, so that the traction oil continues to be delivered unless the drive wheel stops rotating. As the mechanical pump used here, an appropriate one can be selected from various operation types such as a small-capacity trochoid pump.

In the traction oil supply device of the type in which the starting mechanism is incorporated in the toroidal-type continuously variable transmission arranged between the prime mover and the toroidal-type transmission as described above,
A detection unit for determining whether the engine or the like has stopped is required. As the detection unit, a signal input from a sensor connected to an ignition switch, a gear position sensor, a crank angle sensor, or the like can be used in addition to a method of monitoring a current value or a voltage value of an ignition system.

[0023]

As described above, according to the traction oil supply device of the toroidal type continuously variable transmission of the present invention, the traction surfaces of the input disk and the output disk and the peripheral surface of the power roller do not pass through the oil film. Even when it is in direct contact with the traction oil, the traction oil can be supplied around the contact point before each part of the toroidal transmission mechanism actually starts rotating, so that each metal does not pass through the oil film. No direct rubbing occurs. As a result, damage to the surface of the member is prevented, and the durability of the entire toroidal-type continuously variable transmission can be greatly improved.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing one configuration example of a traction oil supply device of a toroidal type continuously variable transmission according to the present invention.

[Explanation of symbols]

 Reference Signs List 1 cylinder chamber 2 piston 3 elastic body 4 through hole 5 piston shaft 6 feed screw mechanism 7 one-way clutch 8 screw feed gear 9 motor 10 drive gear 11 solenoid 12 stopper 50 screw thread 51 jaw

Claims (2)

[Claims] 1. A traction oil supply pump for pumping traction oil to a traction surface of a toroidal transmission mechanism, and a traction oil supply pump disposed between the toroidal transmission mechanism and drive wheels for intermittent torque at start and stop. A traction surface of the toroidal-type transmission mechanism is incorporated in a toroidal-type continuously variable transmission having a starting mechanism for switching, and when the motor is started, before the output shaft of the motor actually starts rotating. Traction oil supply device for a toroidal-type continuously variable transmission that supplies traction oil to the vehicle. 2. A traction oil supply pump for pumping traction oil to a traction surface of a toroidal transmission mechanism, and a torque at the time of starting and stopping when being disposed between an output shaft of a motor and the toroidal transmission mechanism. It is incorporated in a toroidal-type continuously variable transmission having a starting mechanism for switching on and off, and when the driving wheels are rotated from the outside while the motor is stopped, traction oil is applied to the traction surface of the toroidal-type transmission. Traction oil supply device for toroidal type continuously variable transmission to be supplied.