Lubricant guiding structure in automatic transmission

Abstract

Provided is a lubricant guiding structure in an automatic transmission in which a baffle plate configured to regulate the movement of a lubricant agitated by a driven sprocket is provided at one side, where an oil pump is located, in the direction of a rotational axis of the driven sprocket. As viewed from the rotational axis direction, a division wall disposed to extend across a chain is provided closer to the chain than a base of the baffle plate. As viewed from the rotational axis direction, the baffle plate is provided with a guide wall extending along a torque transmission-side chain of the chain wound on the driven sprocket. As viewed from the rotational axis-direction, the guide wall includes an inclined portion inclined in the direction coming closer to the chain as the distance to the distal end side decreases.

The invention claimed is: 
     
       1. A lubricant guiding structure in an automatic transmission, wherein the automatic transmission comprises:
 a drive-side gear;   a driven-side gear; and   a chain through which a transmission of a rotation between the drive-side gear and the driven-side gear is performed, the chain which is wound on the drive-side gear and the driven-side gear, the lubricant guiding structure comprising:   a baffle plate provided on one side in an rotational axis of the driven-side gear, the baffle plate which is configured to regulate a movement of a lubricant agitated by the driven-side gear to the one side,   wherein, as viewed from a direction of the rotational axis, a division wall is provided on a drive-side gear side of the baffle plate,   wherein, in the rotational axis direction, the division wall is provided closer to the chain than the baffle plate,   wherein, as viewed from the rotational axis direction, the baffle plate is provided with a wall portion extending toward the drive-side gear along a torque transmission-side chain of the chain wound on the driven-side gear, and   wherein, in the rotational axis direction, the wall portion is inclined in a direction coming closer to the chain as a distance to a distal end side of the wall portion decreases.   
     
     
       2. The lubricant guiding structure in the automatic transmission according to  claim 1 , wherein the wall portion is formed integrally with the baffle plate. 
     
     
       3. The lubricant guiding structure in the automatic transmission according to  claim 1 , wherein a clearance between a distal end in an extending direction of the wall portion and the chain in the rotational axis direction is set equal to a clearance between the division wall and the chain in the rotational axis direction. 
     
     
       4. The lubricant guiding structure in the automatic transmission according to  claim 3 , wherein the distal end in the extending direction of the wall portion is provided with a flat portion parallel to the chain. 
     
     
       5. The lubricant guiding structure in the automatic transmission according to  claim 1 , wherein, in the baffle plate, a partition wall inclined in the same direction as the wall portion is further included adjacent to the wall portion,
 wherein, as viewed from the rotational axis direction, the partition wall is provided along the division wall provided to extend across the chain, between the torque transmission-side chain located on one side of the chain wound on the driven-side gear and a chain located on the other side, and   wherein, in the rotational axis direction, the partition wall is provided closer to the chain than the division wall.   
     
     
       6. An automatic transmission comprising:
 a division wall;   a drive-side gear;   a driven-side gear;   a chain which is wound on the drive-side gear and the driven-side gear; and   a baffle plate,   wherein the baffle plate is provided with a base portion which covers a range larger than an outer diameter of the chain,   wherein, as viewed from a direction of a rotational axis of the driven-side gear, the chain is positioned more on a front side than the base portion of the baffle plate,   wherein, as viewed from the direction of the rotational axis of the driven-side gear, an end surface of the division wall is positioned more on the front side than the base portion of the baffle plate,   wherein, as viewed from the direction of the rotational axis of the driven-side gear, the baffle plate includes a wall portion extending more on the front side than the base portion of the baffle plate between the drive-side gear and the driven-side gear, and   wherein, as viewed from the direction of the rotation axis of the driven-side gear, the division wall is disposed to extend across the chain, and an outer periphery of the division wall is located on an outside in a radial direction of the baffle plate with the rotation axis as a reference.    
     
     
       7. The automatic transmission according to  claim 6 , the wall portion has a shape of which a width becomes narrower as it goes toward a distal end portion thereof.  
     
     
       8. The automatic transmission according to  claim 6 , wherein the baffle plate includes a compartment wall portion, and
 wherein, as viewed from the direction of the rotational axis of the driven-side gear, the compartment wall portion includes a part positioned between the chain and a final gear, and   wherein, as viewed from the direction of the rotational axis of the driven-side gear, the wall portion includes a part positioned between the chain and the final gear.    
     
     
       9. The automatic transmission according to  claim 6 , wherein the wall portion includes, at a distal end thereof, a flat portion.  
     
     
       10. An automatic transmission comprising:
 a division wall;   a drive-side gear;   a driven-side gear;   a chain which is wound on the drive-side gear and the driven-side gear; and   a baffle plate,   wherein the baffle plate is provided with a base portion which covers a range larger than an outer diameter of the chain,   wherein, as viewed from a direction of a rotational axis of the driven-side gear, the chain is positioned more on a front side than the base portion of the baffle plate,   wherein, as viewed from the direction of the rotational axis of the driven-side gear, an end surface of the division wall is positioned more on the front side than the base portion of the baffle plate,   wherein, as viewed from the direction of the rotational axis of the driven-side gear, the baffle plate includes a wall portion extending more on the front side than the base portion of the baffle plate, at a position close to the division wall, and   wherein, as viewed from the direction of the rotation axis of the driven-side gear, the division wall is disposed to extend across the chain, and an outer periphery of the division wall is located on an outside in a radial direction of the baffle plate with the rotation axis as a reference.    
     
     
       11. The automatic transmission according to  claim 10 , the wall portion has a shape of which a width becomes narrower as it goes toward a distal end portion thereof.  
     
     
       12. The automatic transmission according to  claim 10 , wherein the baffle plate includes a compartment wall portion, and
 wherein, as viewed from the direction of the rotational axis of the driven-side gear, the compartment wall portion includes a part positioned between the chain and a final gear, and   wherein, as viewed from the direction of the rotational axis of the driven-side gear, the wall portion includes a part positioned between the chain and the final gear.    
     
     
       13. The automatic transmission according to  claim 10 , wherein the wall portion includes, at a distal end thereof, a flat portion.