JP2012077878A - Power transmission device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power transmission device that prevents a stabilizer from interfering with another member.SOLUTION: The stabilizer 6 is provided with a mounting part 21 having a through-hole 22 formed therein extending in parallel in the axial direction of a support shaft 7, and the support shaft 7 is provided with a projection part 24 projecting outward in the radial direction of the support shaft, and an insertion shaft part 23 extending in the axial direction of the support shaft from a tip end of the projection part 24. The insertion shaft part 23 of the support shaft 7 and the through-hole 22 of the mounting part 21 of the stabilizer 6 are fitted so that relative movement of the support shaft 7 and the stabilizer 6 in the axial direction of the support shaft is inhibited.

Description

  The present invention relates to a power transmission device suitable for a continuously variable transmission (CVT) of a vehicle such as an automobile.

  As a continuously variable transmission (power transmission device) for an automobile, a primary pulley composed of a fixed sheave and a movable sheave each having a conical surface sheave surface, and a secondary pulley composed of a fixed sheave and a movable sheave each having a conical surface sheave surface A winding transmission member wound between the pulleys, a casing for accommodating these members, and a support shaft provided in the casing, so that the string portion of the winding transmission member is inserted so as to be relatively movable. And a stabilizer (or guide rail) that regulates the movement of the winding transmission member and a support shaft that supports the stabilizer (Patent Document 1).

  In this type of power transmission device, the portion (string portion) between the pulleys of the wrapping transmission member is not restricted by the pulley, so it is easy to vibrate (string vibration). For this reason, there is a problem that noise characteristics deteriorate. In the case of Patent Document 1, string vibration is controlled by restricting the movement of a winding transmission member by a guide rail (referred to as “stabilizer” in this specification). Is reduced.

JP 2005-282695 A

  In the above-described conventional power transmission device, the support shaft and the stabilizer are separate components, and the stabilizer is attached to the support shaft via the attachment portion. Here, the stabilizer needs to move in response to the winding transmission member that changes its shape by changing the gear ratio, and therefore, the movement of the stabilizer in the direction of the support shaft relative to the support shaft is allowed to some extent. When the movement amount is large, the stabilizer may interfere with other members.

  An object of the present invention is to provide a power transmission device that prevents a stabilizer from interfering with other members.

  A power transmission device according to the present invention includes a primary pulley composed of a fixed sheave and a movable sheave, a secondary pulley composed of a fixed sheave and a movable sheave, a wound transmission member wound around both pulleys, and a casing that accommodates these members. In the power transmission device including a stabilizer that restricts the movement of the winding transmission member by inserting the string portion of the winding transmission member so as to be relatively movable, and a support shaft that supports the stabilizer, the stabilizer is supported by the stabilizer. A mounting portion in which a through-hole extending in parallel to the axial direction is formed, a protruding portion protruding outward in the radial direction of the supporting shaft on the supporting shaft, and an insertion shaft portion extending in the supporting axial direction from the tip of the protruding portion The insertion shaft portion of the support shaft and the through hole of the mounting portion of the stabilizer are the support shaft shaft of the support shaft and the stabilizer. It is characterized in that a relative movement in the direction is fitted as impossible.

  The power transmission device may be a chain type (the winding transmission member is a chain), and may be a belt type (the winding transmission member is a belt).

  This power transmission device is suitable for use as a continuously variable transmission for a vehicle such as an automobile. In such a continuously variable transmission, a winding transmission member is sandwiched between the sheave surfaces of both sheaves, and the movable sheave is moved by a hydraulic actuator, so that the distance between the sheave surfaces of the continuously variable transmission and hence the winding transmission member of the continuously variable transmission is reduced. The winding radius is assumed to change.

  The stabilizer and the support shaft are made of, for example, a synthetic resin, but are not limited to this, and either one or both may be made of metal.

  The stabilizer has, for example, a square shape in cross section. The stabilizer is sandwiched between the two parts constituting the stabilizer from both sides, and is attached to the support shaft via the attachment portion. The winding transmission member moves while being guided by the stabilizer, thereby reducing the string vibration.

  In the power transmission device, the underdrive (hereinafter referred to as “U / D”) having the maximum speed ratio corresponding to low speed traveling and the overdrive (hereinafter referred to as “O / D”) corresponding to the minimum speed ratio corresponding to high speed traveling. ").) The gear ratio changes. In the U / D state, the winding diameter on the primary pulley side is the smallest and the winding diameter on the secondary pulley side is the maximum, and in the O / D state, the opposite is true.

  When the power transmission device changes between the U / D state and the O / D state, the stabilizer needs to move in accordance with the change in the shape of the winding transmission member. Is supported by the support shaft so as to be rotatable about the axis of the support shaft, and the stabilizer is allowed to move to some extent in the direction of the support shaft. This movement of the stabilizer in the direction of the support shaft is not preferable in that it interferes with other members.

  Therefore, in the power transmission device according to the present invention, the support shaft and the stabilizer are coupled so that relative movement in the direction of the support shaft is impossible. Specifically, the stabilizer is provided with a mounting portion in which a through-hole extending in parallel to the support shaft axis direction is provided, and the support shaft is provided with a protrusion projecting outward in the support shaft radial direction and the tip of the protrusion portion. An insertion shaft portion extending in the direction of the support shaft is provided, and the insertion shaft portion of the support shaft and the through hole of the mounting portion of the stabilizer cannot be moved relative to each other in the direction of the support shaft. It is assumed that they are fitted together.

  The relative rotation between the support shaft and the stabilizer may or may not be possible. When relative rotation between the support shaft and the stabilizer is impossible, the support shaft is rotatably supported by the casing. The cross-sectional shape of the insertion shaft portion and the through hole may be circular or square. The fitting between the insertion shaft portion and the through hole may be press-fitting (squee fitting) or clearance fitting.

  Preferably, a locking claw that engages with the edge of the through hole after passing through the through hole of the stabilizer is formed at the tip of the insertion shaft part. In a configuration in which relative movement in the support shaft axial direction is impossible by the engagement of the locking claws, the interval between the protruding portion and the locking claw is made to coincide with the axial length of the mounting portion.

  The casing is formed, for example, by abutting a bottomed cylindrical main body and a lid, and the support shaft has a circular cross section, and is rotatably hung between the bottom wall of the main body and the bottom wall of the lid. Passed. As a form at this time, for example, a bottomed hole into which the end of the support shaft is fitted is provided in the bottom wall of the main body and the lid, and the end of the support shaft is fitted into the bottomed hole with a clearance fit.

  Since the stabilizer and the support shaft are combined, the sliding surface between the support shaft and the shaft insertion portion may be easily worn with the movement of the stabilizer, so both ends of the support shaft are attached to the casing. It is preferable that the shaft insertion portion is provided with a clearance fit (rotatably) and at least one groove serving as a lubricant reservoir is formed at each end portion of the support shaft.

  The center position of the stabilizer is, for example, an intersection position between the locus of the winding transmission member when the speed ratio is maximum and the locus of the winding transmission member when the speed ratio is minimum. The center position of the stabilizer is a predetermined amount (1 mm or more, for example, about 1 to 2 mm) than the intersection position between the locus of the winding transmission member when the speed ratio is maximum and the locus of the winding transmission member when the speed ratio is minimum. ) May be offset. When offset, the stabilizer will have a tensioner function to apply tension to the wound transmission member, thereby adding a string vibration reduction effect. In any case, the position of the through hole of the stabilizer mounting portion is set so as to correspond to the set center position of the stabilizer, and the positions of the support shaft and the insertion shaft portion are set accordingly.

  According to the power transmission device of the present invention, the stabilizer is provided with the mounting portion in which the through hole extending in parallel to the support shaft axis direction is provided, and the protrusion and the protrusion protruding outward in the support shaft radial direction are provided on the support shaft. An insertion shaft portion extending from the tip of the support portion in the direction of the support shaft is provided, and the insertion shaft portion of the support shaft and the through hole of the mounting portion of the stabilizer are relatively moved in the direction of the support shaft between the support shaft and the stabilizer. Therefore, the stabilizer is prevented from interfering with other members.

FIG. 1 is a front view showing an embodiment of a power transmission device according to the present invention. FIG. 2 is a side sectional view of the power transmission device according to the present invention. 3 is an exploded view of the main part of FIG. 2, (a) is a view (side sectional view) in the same direction as FIG. 2, and (b) is an axial direction of the support shaft. It is the figure seen from.

  Embodiments of the present invention will be described below with reference to the drawings.

  1 to 3 show an embodiment of a power transmission device according to the present invention. As shown in FIG. 1, a power transmission device (1) is a primary pulley (2) comprising a fixed sheave and a movable sheave. A secondary pulley (3) composed of a fixed sheave and a movable sheave, a winding transmission member (4) wound between both pulleys (2) and (3), a casing (5) for housing them, and a winding A stabilizer (6) that regulates the movement of the winding transmission member (4) by inserting the chord part of the transmission member (4) (part not regulated by the pulley (2) (3)) so as to be relatively movable. And a support shaft (7) for supporting the stabilizer (6).

  In the power transmission device (1), the underdrive (hereinafter referred to as “U / D”) corresponding to the maximum speed ratio corresponding to low speed driving and the overdrive (hereinafter referred to as “U / D”) corresponding to the maximum speed ratio during high speed driving. O / D "))). In the U / D state (indicated by a two-dot chain line in FIG. 1), the winding diameter on the primary pulley (2) side is the smallest, and the winding diameter on the secondary pulley (3) side is the largest. In the state (shown by the solid line in FIG. 1), the reverse is true.

  As shown in FIG. 2, the power transmission chain (4) includes a plurality of links (11) having front and rear insertion portions provided at predetermined intervals in the chain length direction, and links (11) arranged in the chain width direction. And a plurality of pins (12) that connect each other so as to be bent in the length direction. The stabilizer (6) is made of synthetic resin and has a split shape, and the power transmission chain (4) after being wound between both pulleys (2) and (3) is sandwiched from both sides and abutted. It is attached to the power transmission chain (4). The cross section of the stabilizer (6) is formed in a rectangular shape having a size that allows the link (11) and the pin (12) to be inserted with some play. As a result, the string portion of the power transmission chain (4) (the portion not regulated by the pulley (2) (3)) is inserted into the stabilizer (6) so as to be relatively movable, and the string of the power transmission chain (4) The movement in the direction orthogonal to the traveling direction of the part is regulated by the stabilizer (6).

  The casing (5) is formed by abutting the bottomed cylindrical main body (5a) and the lid (5b). The bottom wall of the main body (5a) of the casing (5) and the bottom wall of the lid (5b) are provided with shaft insertion portions (13) into which the ends of the support shaft (7) are fitted. Each end of the support shaft (7) is fitted into the shaft insertion portion (13) with a clearance fit, so that the support shaft (7) is attached to the bottom wall of the main body (5a) and the lid (5b). The stabilizer (6) is rotatably supported between the bottom wall and the axis of the support shaft (7). Therefore, when the winding transmission member (4) changes from the U / D state to the O / D state, the winding transmission member (4) of the winding transmission member (4) as shown by the two-dot chain line and the solid line in FIG. The stabilizer (6) changes the inclination angle according to the change of the shape.

  A plurality of grooves (14) are formed at each end of the support shaft (7). A lubricant is held in these grooves (14), and these grooves (14) serve as a lubricant reservoir, so that each end of the support shaft (7) and the shaft insertion portion (13) slide. Sufficient grease is supplied to the surface to improve wear resistance.

  The support shaft (7) and the stabilizer (6) are coupled so that relative movement in the axial direction of the support shaft (7) is impossible. That is, as shown in FIG. 2 and FIGS. 3 (a) and 3 (b), a mounting portion (21) in which a through hole (22) extending parallel to the axial direction of the support shaft (7) is formed in the stabilizer (6). The support shaft (7) is provided with a projecting portion (24) projecting outward in the support shaft radial direction and an insertion shaft portion (23) extending from the tip of the projecting portion (24) in the support shaft axis direction. ing.

  The fitting between the insertion shaft part (23) of the support shaft (7) and the through hole (22) of the attachment part (21) of the stabilizer (6) is loose (clear fit), and the insertion shaft part At the tip of (23), the insertion shaft (23) passes through the through hole (22) of the mounting part (21) of the stabilizer (6) and then engages with the edge of the through hole (22) to prevent it from coming off. A locking claw (25) that functions is formed. The locking claw (25) has a right triangle shape having an inclined surface so that it can easily pass through the through hole (22). The distance between the projecting portion (24) and the locking claw (25) is matched to the axial length of the mounting portion (21), and thus the insertion shaft portion (23) of the support shaft (7) and the stabilizer. The through hole (22) of the attachment part (21) of (6) is fitted so that the support shaft (7) and the stabilizer (6) cannot be moved relative to each other in the direction of the support shaft.

  In addition, in FIG.3 (b), although the cross-sectional shape (as well as the cross-sectional shape of the insertion shaft part (23)) of the through-hole (22) is a square, it is not limited to this, You can also When the cross-sectional shape of the insertion shaft part (23) and the through hole (22) is circular, the fitting is a clearance fit, and the stabilizer (6) rotates around the axis of the insertion shaft part (23). The insertion shaft portion (23) and the through hole (22) are fitted together so that the stabilizer (6) and the support shaft (7) rotate integrally. May be.

  According to the power transmission device (1), since the movement in the direction orthogonal to the traveling direction of the string portion of the winding transmission member (4) is regulated by the stabilizer (6), string vibration is reduced. Further, since the support shaft (7) and the stabilizer (6) are coupled so that relative movement in the direction of the support shaft is not possible, the stabilizer (6) is prevented from interfering with other members. In addition, since the gap between the stabilizer (6) and the power transmission chain (4) is maintained at a constant value, adverse effects on noise are reduced.

(1) Power transmission device
(2) (3) Pulley
(4) Dynamic winding transmission member
(5) Casing
(6) Stabilizer
(7) Support shaft
(21) Mounting part
(22) Through hole
(23) Insertion shaft
(24) Projection
(25) Locking claw

Claims (2)

A primary pulley composed of a fixed sheave and a movable sheave, a secondary pulley composed of a fixed sheave and a movable sheave, a winding transmission member wound between both pulleys, a casing for accommodating these, and a string portion of the winding transmission member In a power transmission device including a stabilizer that restricts the movement of the winding transmission member by being inserted so as to be relatively movable, and a support shaft that supports the stabilizer.
The stabilizer is provided with a mounting portion in which a through hole extending in parallel to the support shaft axis direction is provided, and the support shaft protrudes outward in the support shaft radial direction and from the tip of the protrusion portion to the support shaft axis direction. An extending insertion shaft portion is provided, and the insertion shaft portion of the support shaft and the through hole of the mounting portion of the stabilizer are fitted so that relative movement of the support shaft and the stabilizer in the direction of the support shaft is impossible. A power transmission device characterized by comprising:   The power transmission device according to claim 1, wherein a locking claw that engages with the edge of the through hole after the through hole of the mounting portion is formed at the distal end of the insertion shaft portion.

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