JP2014081060A - Belt type continuously variable transmission - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a belt type continuously variable transmission which even when a phenomenon causing that an oil chamber attached to a driven side pulley is turned to a negative pressure is generated, can suppress inflow of air into the oil chamber of the driven side pulley and can minimize delay of starting time required for restarting an engine and starting the transmission.SOLUTION: A belt type continuously variable transmission X includes: a main oil passage 60 (driven side main oil passage 60b) connecting between a hydraulic oil chamber 22c of a driven pulley 21 and an oil pump 6 to be driven by an engine and a sub oil passage 70 connected on the way of the driven side main oil passage 60b. The sub oil passage 70 has a suction port 74 capable of sucking oil from an oil pan 72 storing the oil. A one-way valve 76 allowing a flow of oil from the oil pan 72 side to the hydraulic oil chamber 22c side and capable of obstructing a flow of oil from the hydraulic oil chamber 22c side to the oil pan 72 side is attached on the way of the sub oil passage 70.

Description

  The present invention relates to a belt type continuously variable transmission.

  Conventionally, there has been provided a hydraulic control device for a belt-type continuously variable transmission as disclosed in Patent Document 1 below. Patent Document 1 discloses a method for discharging air mixed in a hydraulic chamber.

JP 2012-145172 A

  In a vehicle that can pump oil by an oil pump that operates using the power of the engine and does not have an oil pump that operates using a power source other than the engine, if idling stop is performed during deceleration, Oil supply by the oil pump stops between the stop and the vehicle stop. If the belt-type continuously variable transmission shifts to the low side in this state, a phenomenon may occur in which the oil chamber provided in the driven pulley becomes negative pressure. When such a phenomenon occurs, air flows in from the sealing portion, and there is a concern that when the engine is restarted and started, the rise of hydraulic pressure is delayed and the start time is delayed.

  Therefore, in order to solve the above-described problem, the present invention suppresses the inflow of air into the oil chamber of the driven pulley even if a phenomenon occurs in which the oil chamber provided in the driven pulley becomes negative pressure, The purpose of the present invention is to provide a belt type continuously variable transmission capable of minimizing the delay of the start time required for restarting the vehicle and starting the vehicle.

  The present invention, which is provided to solve the above-described problems, is configured to span a belt between a driving pulley attached to a driving shaft and a driven pulley attached to a driven shaft, and the driving pulley And a belt-type continuously variable transmission capable of controlling the striking diameter of the belt by applying clamping pressure to at least one of the driven pulley, wherein the driven pulley is fixed to the shaft. A movable sheave that can move close to and away from the fixed sheave by moving along the shaft, and a hydraulic servo that forms an oil chamber between the movable sheave and the engine. A main oil passage connecting between the oil pump to be driven and the oil chamber; and a sub oil passage connected in the middle of the main oil passage; A suction port capable of sucking oil in an oil storage part in which oil is stored, allowing a flow from the oil storage part side to the oil chamber side in the middle of the sub oil passage; A one-way valve capable of preventing the flow to the oil reservoir is provided.

  In the belt type continuously variable transmission according to the present invention, when the oil chamber provided in the driven pulley is in a negative pressure state, the one valve provided in the sub oil passage is opened, and the oil is passed through the sub oil passage. Oil is supplied from the reservoir to the oil chamber. As a result, it is possible to prevent air from entering the oil chamber provided in the driven pulley, and to minimize the delay in the start time required to restart the engine and start.

  According to the present invention, even if a phenomenon occurs in which the oil chamber provided in the driven pulley becomes negative pressure, the inflow of air into the oil chamber of the driven pulley is suppressed, and the engine is restarted to start. Thus, it is possible to provide a belt type continuously variable transmission that can suppress the delay of the start time required until the time is minimized.

It is an expanded sectional view of the continuously variable transmission concerning one embodiment of the present invention. FIG. 2 is a skeleton diagram of the continuously variable transmission shown in FIG. 1. It is a graph which shows the relationship between the vehicle speed and engine speed at the time of performing idle stop operation | movement.

  Next, a belt type continuously variable transmission X (hereinafter also simply referred to as “continuously variable transmission X”) according to an embodiment of the present invention will be described. The continuously variable transmission X is an FF horizontal type automotive transmission, and generally includes an input shaft 3, a forward / reverse switching device 4, a continuously variable transmission A, a differential device 30 and the like as shown in FIGS. It consists of The input shaft 3 is driven by the engine output shaft 1 via the torque converter 2 and is connected to the turbine runner 2 b of the torque converter 2. The forward / reverse switching device 4 is a device that transmits the rotation of the input shaft 3 to the drive shaft 10 by switching forward and reverse. The continuously variable transmission A includes a drive pulley 11, a driven pulley 21, and a V belt 15 wound around both pulleys. The differential device 30 transmits the power of the driven shaft 20 to the output shaft 32.

  In the continuously variable transmission X of the present embodiment, the input shaft 3 and the drive shaft 10 are disposed on the same axis, and the driven shaft 20 and the output shaft 32 of the differential device 30 are parallel to the input shaft 3 and Arranged non-coaxially. Therefore, the continuously variable transmission X has a three-axis configuration as a whole. The V-belt 15 used in this embodiment is a known metal belt composed of a pair of endless tension bands and a large number of blocks supported by these tension bands.

  Each component constituting the continuously variable transmission X is accommodated in the transmission case 5. An oil pump 6 is disposed between the torque converter 2 and the forward / reverse switching device 4. The oil pump 6 includes a pump gear 9 that is driven by the pump impeller 2 a of the torque converter 2.

  As shown in FIGS. 1 and 2, the forward / reverse switching device 4 includes a planetary gear mechanism 40, a forward brake 50, and a reverse clutch 51. A sun gear 41 of the planetary gear mechanism 40 is connected to the input shaft 3 as an input member, and a ring gear 42 is connected to the drive shaft 10 as an output member. The planetary gear mechanism 40 is a single pinion system, the forward brake 50 is provided between the carrier 44 supporting the pinion gear 43 and the transmission case 5, and the reverse clutch 51 is provided between the carrier 44 and the sun gear 41. ing. When the reverse clutch 51 is released and the forward brake 50 is engaged, the rotation of the input shaft 3 is reversed, decelerated, and transmitted to the drive shaft 10. Conversely, when the forward brake 50 is released and the reverse clutch 51 is engaged, the carrier 44 and the sun gear 41 of the planetary gear mechanism 40 rotate together, so that the input shaft 3 and the drive shaft 10 are directly connected.

  The drive pulley 11 of the continuously variable transmission A is a fixed sheave 11a formed integrally on a drive shaft (pulley shaft) 10 and a movable supported on the drive shaft 10 so as to be axially movable and integrally rotatable. A sheave 11b and a hydraulic servo 12 provided behind the movable sheave 11b are provided. A piston portion 12a extending to the back side is integrally formed on the outer peripheral portion of the movable sheave 11b, and the outer peripheral portion of the piston portion 12a is in sliding contact with the inner peripheral portion of the cylinder 12b fixed to the drive shaft 10. A hydraulic oil chamber 12c of the hydraulic servo 12 is formed between the movable sheave 11b and the cylinder 12b. Shift control can be performed by controlling the hydraulic pressure to the hydraulic oil chamber 12c.

  The driven pulley 21 includes a fixed sheave 21a integrally formed on a driven shaft (pulley shaft) 20, a movable sheave 21b supported on the driven shaft 20 so as to be axially movable and integrally rotatable, and a movable sheave. And a hydraulic servo 22 provided behind 21b. A cylinder portion 22a extending to the back surface is integrally formed on the outer peripheral portion of the movable sheave 21b, and a piston portion 22b (fixed piston) fixed to the driven shaft 20 is in sliding contact with the inner peripheral portion of the cylinder portion 22a. . A hydraulic oil chamber 22c of the hydraulic servo 22 is formed between the movable sheave 21b and the piston portion 22b. By controlling the hydraulic pressure of the hydraulic oil chamber 22c, a belt thrust necessary for torque transmission is given. A spring 24 that applies initial thrust is disposed in the hydraulic oil chamber 22c.

  The continuously variable transmission X has a main oil passage 60 for supplying oil to the hydraulic oil chamber 12c on the drive pulley 11 side and the hydraulic oil chamber 22c of the driven pulley 21 described above. An oil pump 6 is disposed on the upstream side of the main oil passage 60. Therefore, in a state where the engine is operating, the oil pump 6 operates, and the oil can be pumped from the upstream end of the main oil passage 60 and pumped.

  The main oil passage 60 is branched into two systems of a driving side main oil passage 60a and a driven side main oil passage 60b at a branch point 62 located on the downstream side of the oil pump 6. The drive side main oil passage 60 a is connected to the hydraulic oil chamber 12 c of the drive pulley 11. In the middle of the drive side main oil passage 60a, orifices 64 and 66 are provided.

  The driven side main oil passage 60 b is connected to the hydraulic oil chamber 22 c of the driven pulley 21. Further, a sub oil passage 70 is connected in the middle of the driven main oil passage 60b, that is, at a position between the branch point 62 and the connecting portion of the hydraulic oil chamber 22c in the main oil passage 60. A suction port 74 is provided at the upstream end of the sub oil passage 70. The sub oil passage 70 can suck oil from the oil pan 72 (oil storage part) through the suction port 74.

  A one-way valve 76 is provided in the middle of the sub oil passage 70. On the other hand, the valve 76 is a valve that allows a flow from the oil pan 72 side to the hydraulic oil chamber 22c side and prevents a flow from the hydraulic oil chamber 22c side to the oil pan 72 side.

  As described above, in the belt type continuously variable transmission X of the present embodiment, the main oil passage 60 (driven main oil passage 60b) that connects between the oil pump 6 driven by the engine and the hydraulic oil chamber 22c; A sub oil passage 70 connected in the middle of the driven main oil passage 60b is provided. In addition, the sub oil passage 70 can suck in the oil in the oil pan 72 in which the oil is stored, and a one-way valve 76 is provided in the middle of the sub oil passage 70 so that the hydraulic oil chamber 72c side from the oil pan 72 side. The flow from the hydraulic oil chamber 22c side to the oil pan 72 side can be prevented. Therefore, when the hydraulic oil chamber 22 c provided in the driven pulley 21 is in a negative pressure state, the one valve 76 provided in the sub oil passage 70 is opened, and the hydraulic oil is supplied from the oil pan 72 via the sub oil passage 70. Oil is supplied to the chamber 22c.

  Specifically, as shown in FIG. 3, when the vehicle performs an idle stop operation, the engine is stopped when a predetermined vehicle speed is reached, and then the engine speed reaches zero. Since the oil pump 6 is driven by the engine, during the period α from when the engine speed becomes zero to when the vehicle speed becomes zero, the V-belt 15 is not supplied with oil by the oil pump 6. It will be in a rotating state. In such a state, the continuously variable transmission A shifts to the low side, the volume of the hydraulic oil chamber 22c on the driven pulley 21 side increases, and the inside of the hydraulic oil chamber 22 may become negative pressure. When the pressure in the hydraulic oil chamber 22 becomes negative, air is sucked in from the outside, and there is a concern that the pressurization of the hydraulic oil chamber 22 is delayed at the next engine start and the start time is delayed.

  Assuming such a situation, in the belt type continuously variable transmission X of the present embodiment, the sub oil passage 70 is connected to the driven side main oil passage 60b connected to the hydraulic oil chamber 22c, and the oil pump 6 is stopped. Even if it exists, the oil can be sucked from the oil pan 72 through the sub oil passage 70. Thereby, it is possible to prevent air from entering the hydraulic oil chamber 22c provided in the driven pulley 21, and to minimize the delay of the start time required to restart the engine and start.

  In the present embodiment, the configuration in which the sub oil passage 70 is provided so that the oil can be sucked from the oil pan 72 is illustrated. It is good also as a structure which provided the sub oil path 70 so that inhalation was possible.

  The belt type continuously variable transmission X of the present invention can be used in all vehicles.

6 oil pump 10 drive shaft 11 drive pulley 15 V belt 20 driven shaft 21 driven pulley 21a fixed sheave 21b movable sheave 22 hydraulic servo 22c hydraulic oil chamber 60 main oil passage 60b driven main oil passage 70 sub oil passage 72 oil pan (oil Reservoir)
74 Suction port 76 One-way valve X Belt type continuously variable transmission

Claims (1)

A belt is stretched between a driving pulley attached to the driving shaft and a driven pulley attached to the driven shaft, and a clamping pressure is applied to at least one of the driving pulley and the driven pulley. A belt-type continuously variable transmission capable of controlling the belting diameter of the belt,
The driven pulley is
A fixed sheave fixed to the shaft;
A movable sheave capable of moving toward and away from the fixed sheave by moving along the shaft;
A hydraulic servo that forms an oil chamber with the movable sheave,
A main oil passage connecting between an oil pump driven by an engine and the oil chamber;
A sub oil passage connected in the middle of the main oil passage,
The sub oil passage has a suction port capable of sucking oil in an oil storage part in which oil is stored;
A one-way valve that allows flow from the oil reservoir side to the oil chamber side and prevents flow from the oil chamber side to the oil reservoir side is provided in the middle of the sub oil passage. A belt type continuously variable transmission.

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