JP2006329379A - Belt type continuously variable transmission - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a belt type continuously variable transmission capable of preventing fuel economy from worsening by reducing stirring resistance of lubrication oil by a belt or a gear of a differential mechanism to prevent oil temperature from rising. <P>SOLUTION: The belt type continuously variable transmission is equipped with a primary pulley 1, a secondary pulley 2, the differential mechanism 3 and a casing 4 for supporting them. The casing 4 is equipped with an air breather 5 and a strainer 6 for sucking lubrication oil retained at a bottom part of the casing 4 to above the primary pulley and the secondary pulley. In this case, a threshold 7 for parting a space A communicating with the air breather 5 and a space B including the primary pulley 1, the secondary pulley 2 and the differential mechanism 3 is provided in a liquid-tight manner and a lower end part of the threshold 7 is positioned between the bottom of the casing 4 and an oil level α. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a belt type continuously variable transmission used in an automobile.

Conventionally, as a belt type continuously variable transmission, there is a belt type continuously variable transmission as described in Patent Document 1, and when viewed from the side of the vehicle, the primary pulley is disposed forward with its central axis as the vehicle width direction, The secondary pulley is disposed obliquely above and behind the center axis of the vehicle in the vehicle width direction, and the differential mechanism is disposed obliquely below and behind the secondary pulley and accommodated in the casing of the belt type continuously variable transmission. An oil pan for storing lubricating oil is provided at the bottom of the casing. The lubricating oil stored in the oil pan is sucked up to the upper side of the primary pulley and the secondary pulley via the oil passage provided in the casing by the pump, and is sprayed from above.
Japanese Patent Laid-Open No. 1-112077

  For this reason, the higher the temperature of the lubricating oil, the larger the volume of the oil itself stored in the oil pan, and the oil adhering to the inner wall of the casing of the belt type continuously variable transmission falls into the oil pan. As the amount of oil in the oil pan increases and the oil level rises, the belt and the belt around the primary pulley and the secondary pulley and the gear of the differential mechanism are In contact with the oil accumulated in the tank, the stirring resistance increases, the temperature of the oil further rises, and the fuel consumption deteriorates.

  An object of the present invention is to solve the above-described problem, and reduce fuel agitation resistance by a belt and a gear of a differential mechanism to prevent an increase in oil temperature, thereby deteriorating fuel consumption. It is an object of the present invention to provide a belt type continuously variable transmission that can be prevented.

A belt-type continuously variable transmission according to the present invention includes a primary pulley, a secondary pulley, a differential mechanism, and a casing that supports them. An oil breather is provided in the casing and the lubricating oil stays at the bottom of the casing. In a belt-type continuously variable transmission that is provided with a strainer that sucks up the primary pulley and the secondary pulley above, a space communicating with the air breather and a space including the primary pulley, the secondary pulley, and the differential mechanism are liquid-tightly defined. A threshold is provided, and the lower end of the threshold is positioned between the bottom of the casing and the oil level.
Here, the oil level refers to an oil level at a low temperature that faces a space including a primary pulley, a secondary pulley, and a differential mechanism.

  According to this, the temperature of the lubricating oil in the belt-type continuously variable transmission rises, the volume of the oil itself stored in the oil pan expands, and the inner wall of the casing of the belt-type continuously variable transmission The adhering oil falls to the oil pan, the amount of oil in the oil pan increases, the oil level rises, and the oil interferes with the belts wound around the primary pulley and secondary pulley and the gear of the differential mechanism As the agitation resistance increases, the air in the space including the primary pulley, the secondary pulley, and the differential mechanism, which are liquid-tightly defined by the sill, is heated by the rise in oil temperature, and the pressure increases. At the same time, the volume of the oil pan can be prevented by pushing down the oil level of the oil pan facing the space, thereby preventing the temperature of the oil from rising and preventing the fuel consumption from deteriorating.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a schematic view showing an embodiment of a belt type continuously variable transmission according to the present invention when a casing is viewed from the side of a vehicle.

  This belt-type continuously variable transmission includes a primary pulley 1, a secondary pulley 2, a differential mechanism 3, and a casing 4 that supports them. The casing 4 is provided with an air breather 5 and stays at the bottom of the casing 4. In a belt-type continuously variable transmission provided with a strainer 6 that sucks lubricating oil up above the primary pulley 1 and the secondary pulley 2, the space A leading to the air breather 5, the primary pulley 1, the secondary pulley 2, and the differential A threshold 7 for liquid-tightly defining the space B including the mechanism 3 is provided, and the lower end of the threshold 7 is positioned between the bottom of the casing 4 and the oil surface α.

Here, the oil level α indicates the oil level at the time of low temperature facing the space A including the primary pulley 1, the secondary pulley 2, and the differential mechanism 3.
That is, the oil facing the space A and the oil facing the space B can freely flow through the gap between the lower end of the threshold 7 and the bottom of the casing 4.

  According to this, the temperature of the lubricating oil in the belt-type continuously variable transmission rises, the volume of the oil itself stored in the oil pan expands, and the inner wall of the casing of the belt-type continuously variable transmission The adhering oil falls into the oil pan, the amount of oil in the oil pan increases, the oil level rises, and the belt (not shown) or the differential mechanism 3 wound around the primary pulley 1 and the secondary pulley 2 The fact that oil interferes with a gear (not shown) and the stirring resistance increases increases that the air in the space B including the primary pulley 1, the secondary pulley 2, and the differential mechanism 3 that are liquid-tightly defined by the sill 7 As the pressure rises and the volume expands, the oil level α facing the space B is prevented by being pushed down to the position of the oil level indicated by β in FIG. Prevents temperature rise and fuel economy It can be prevented from deteriorating.

  As the temperature rises, the oil level drops from the position indicated by α to the position indicated by β, whereby a part of the oil facing the space B is defined by the casing 4 and the sill 7. It will invade A. For this reason, in order to prevent oil from leaking from the air breather 5 when the temperature rises, the volume of the space A needs to be at least larger than the amount of oil entering the space A due to the temperature rise. Needless to say.

  Further, it is preferable that the oil level at a high temperature indicated by β is a height that does not interfere with the primary pulley 1 if possible.

  Further, the sill 7 has a shape along the curve of the casing 4 as shown in FIG. 1 so as not to interfere with the primary pulley 1.

  The belt type continuously variable transmission includes a primary pulley 1 and a secondary pulley 2 and a belt (not shown) wound around them, and the primary pulley 1 is arranged in the vehicle width direction in the front (left side in FIG. 1). The secondary pulley 2 is disposed obliquely above and rearward with the central axis as the vehicle width direction, and the differential mechanism 3 is disposed obliquely below and rearward of the secondary pulley.

  Here, a space A communicating with the air breather 5 is provided adjacent to the vehicle front surface of the casing 4.

  Since the space A is adjacent to the front surface of the vehicle having high cooling performance due to the driving wind in this way, the space A is always cooled, and even if the space B is heated, the space A is heated by the space B. It is possible to prevent the space A from being cooled, increase the pressure in the space B relative to the space A to maintain the pressure difference, and effectively reduce the oil level in the space B.

In addition, a valve (not shown) capable of blocking communication with outside air is provided in the space B including the primary pulley 1, the secondary pulley 2, and the differential mechanism 3 defined by the sill 7.
According to this, it is possible to prevent the temperature of the air in the space B from rising and the pressure from rising too much by opening the valve and communicating the space B and the outside air as the temperature of the oil rises. it can.

Furthermore, the lower end of the sill 7 is made higher than the suction port of the strainer 6.
According to this, even if the oil level drops due to the temperature rise of the air in the space B, the lubricating hole is sucked up to the upper side of the primary pulley 1, the secondary pulley 2 and the differential mechanism 3 through the strainer by a pump (not shown), Can be sprayed.

  In addition, this invention is not limited only to the said embodiment, Many deformation | transformation or a change is possible.

  For example, a pipe-like pipe line (corresponding to a sill) is provided in fluid-tight communication between the air breather and the oil surface, so that the space inside the pipe line, the primary pulley outside the pipe line, the secondary pulley, and the differential device It is good also as a structure which makes a pressure difference generate | occur | produce between the space containing and lowers the oil level of the latter space.

Even in this case, the oil level facing the space outside the pipeline will drop due to the temperature rise, but this will cause some of the oil facing outside the pipeline to enter the space inside the pipeline. become. For this reason, in order to prevent oil from leaking from the air breather when the temperature rises, the volume in the pipeline must be at least larger than the amount of oil entering the pipeline due to the temperature rise. Needless to say.
Further, it goes without saying that the pipe line needs to have a shape along the curve of the casing so as not to interfere with the primary pulley.

  The belt type continuously variable transmission according to the present invention is suitable for use in an A / T vehicle using a belt type continuously variable transmission, and reduces the agitation resistance of lubricating oil in the belt type continuously variable transmission. Thus, an increase in oil temperature and deterioration in fuel consumption can be prevented.

1 is a schematic view showing an embodiment of a belt type continuously variable transmission according to the present invention.

Explanation of symbols

1 Primary pulley 2 Secondary pulley 3 Differential mechanism 4 Casing 5 Air breather 6 Strainer 7 Sill α Oil level (at low temperature)
β Oil level (at high temperature)

Claims (4)

  A strainer that includes a primary pulley, a secondary pulley, a differential mechanism, and a casing that supports them, an air breather is provided in the casing, and the lubricating oil staying at the bottom of the casing is sucked up above the primary pulley and the secondary pulley. In the belt-type continuously variable transmission provided, a sill is provided that fluidly defines a space communicating with the air breather and a space including a primary pulley, a secondary pulley, and a differential mechanism, and the lower end of the sill is disposed on the casing. A belt-type continuously variable transmission, which is located between a bottom and an oil surface.   The belt-type continuously variable transmission according to claim 1, wherein a space communicating with the air breather is provided adjacent to a vehicle front surface of a casing.   The belt-type continuously variable transmission according to claim 2, wherein a valve capable of shutting off communication with outside air is provided in a space including a primary pulley, a secondary pulley, and a differential mechanism defined by the threshold.   The belt-type continuously variable transmission according to claim 2 or 3, wherein a lower end portion of the sill is made higher than a suction port of the strainer.

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