JP2012102857A - Power transmission device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power transmission device capable of reducing adverse effects on noise by eliminating backlashing of a butting part.SOLUTION: The first half 21 and the second half 22 of a stabilizer 6 are formed into similar shapes, and an engaging projection 23 and an engaging groove 24 are formed in the butting surface of the halves 21 and 22. The engaging groove 24 has an engaging part 41 engaged with the engaging projection 23 and an insertion part 42 formed continuous from the engaging part 41 to enable insertion of the entire engaging projection 23. After the engaging projection 23 of one half 21, 22 into the engaging groove 24 from the insertion part 42 of the other half 21, 22, the first half 21 and the second half 22 are slid along the butting surface of the halves 21 and 22, and thus the engaging projection 23 is engaged with the engaging part 42 of the engaging groove 24.

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 guide rail that regulates the movement of the winding transmission member by inserting a winding transmission member wound between the pulleys, a casing that accommodates these members, and a chord portion of the winding transmission member so as to be relatively movable. Is known (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.

  The stabilizer is preferably divided into two parts consisting of a first half and a second half, and the two halves are abutted against each other with the string part of the winding transmission member sandwiched from both sides. Combined. As a configuration in which both halves are coupled to each other, in Patent Document 1, a convex portion (or hook) is formed on one of the butting surfaces of each half, and a concave portion (or opening) is formed on the other. Have been disclosed in which two halves are integrated with each other.

JP 2000-304115 A

  The stabilizer used in the above-described conventional power transmission device has a problem that it may adversely affect noise due to backlash occurring at the abutting portion.

  An object of the present invention is to provide a power transmission device that reduces adverse effects on noise by eliminating backlash at the abutting portion.

  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. And 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 the stabilizers are abutted against each other on both sides of the string portion of the winding transmission member. In the power transmission device including the first half and the second half sandwiched between the first half and the second half, the first half and the second half of the stabilizer have the same shape, and the engaging surfaces of the respective half are engaged with each other. A mating protrusion and an engaging groove are formed, and the engaging groove is provided to engage with the engaging protrusion and to be connected to the engaging portion so that the entire engaging protrusion can be inserted. The first half and the second half are inserted into the engagement groove in the first half and the second half from the insertion part of the other half, respectively. Then, both the half portions are slid along the abutting surfaces, so that the engaging projections and the engaging portions of the engaging grooves are engaged with each other.

  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.

  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.

  The stabilizer has, for example, a substantially square cross-section, and is coupled to each other in a state where the winding member is sandwiched from both sides by the first half and the second half constituting the stabilizer. The winding transmission member moves while being guided by the stabilizer, thereby reducing the string vibration. 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. For this purpose, the stabilizer may be supported so that it can rotate on the support shaft and cannot move in the traveling direction of the winding transmission member, and is supported by the winding transmission member. As the transmission member moves in the traveling direction, the transmission member may be movable in the moving direction. In the latter form, the movement of the stabilizer more than a predetermined amount is restricted by the restricting means. The stabilizer may also be fixed to the support shaft. In this case, the support shaft is rotatably supported by the casing.

  An appropriate amount of clearance is required between the stabilizer and the wrapping transmission member (belt or chain), and when the two halves are joined together, An appropriate amount of gaps will not be secured, which will adversely affect noise. Therefore, in the stabilizer of the power transmission device according to the present invention, one half and the other half are shifted in the length direction (the direction parallel to the string portion of the winding transmission member) and are then abutted on each other. By sliding the part along the abutting surface, the corresponding engaging protrusion and the engaging groove are engaged with each other while the end surfaces of both halves are just aligned.

  Specifically, the first half and the second half of the stabilizer have the same shape, and an engagement protrusion and an engagement groove are formed on the abutment surface of each half, and the engagement groove Has an engaging portion that engages with the engaging protrusion, and an insertion portion that is provided in succession to allow the entire engaging protrusion to be inserted, whereby the first half portion and the second half portion can be inserted. The half part is defined by the fact that the half protrusions are inserted into the engagement grooves from the insertion part of the other half part and then the two half parts are slid along the abutting surface. The mating protrusion and the engaging portion of the engaging groove are engaged with each other.

  In this way, the backlash in the width direction (perpendicular to the abutting surface) becomes zero, and the gap between the stabilizer and the winding transmission member, which has a large effect on noise, is maintained at a constant value, which has a negative effect on noise. Is reduced. Here, since the play in the sliding direction (length direction) does not affect the noise, by providing a degree of freedom in this direction, the ease of assembly can be maintained and the noise can be reduced.

  The engaging protrusion includes a vertical portion extending vertically outward from the abutting surface and a parallel portion extending in parallel with the abutting surface from the outer end of the vertical portion, toward the end of the parallel portion of the engaging protrusion toward the abutting surface. A locking claw that protrudes is provided, and an engaging portion of the engaging groove is provided with a retaining portion that faces the parallel portion of the engaging projection from the abutment surface side. In addition, it is preferable that a protrusion for preventing the engagement protrusion from moving in the disengagement direction is provided.

  In this way, once the two halves are joined together, the engagement between the locking claw and the convex portion prevents the movement of the two halves in the disengagement direction, resulting in looseness associated with use. Therefore, the noise reduction effect is maintained for a long time.

  The material of the stabilizer may be a metal or a synthetic resin, but is preferably formed as a resin molded product by injection or the like. In the case of a resin molded product, the first half and the second half are formed in the same shape, so that a stabilizer can be obtained with one type of mold.

  According to the power transmission device of the present invention, the first half and the second half of the stabilizer have the same shape, and the engagement protrusion and the engagement groove are formed on the abutting surface of each half. The engaging groove has an engaging portion that engages with the engaging protrusion and an insertion portion that is provided in succession to allow the entire engaging protrusion to be inserted, whereby the first half portion And the second half are such that after the engaging projections of one half are inserted into the engaging grooves from the insertion part of the other half, both halves are slid along the abutting surface. Therefore, the engaging projection and the engaging portion of the engaging groove are engaged with each other, so that there is no backlash in the direction perpendicular to the abutting surface in the abutting portion, and the stabilizer and the wrap around which the influence on noise is great The gap between the transmission members is maintained at a constant value, reducing the negative effects on noise. It is.

FIG. 1 is a front view showing an embodiment of a power transmission device according to the present invention. FIG. 2 is a cross-sectional view of a stabilizer arrangement portion of the power transmission device according to the present invention. FIG. 3 is a plan view in which a portion of the stabilizer is cut away. FIG. 4 is an enlarged cross-sectional view of a main part of FIG. FIG. 5 is a plan view showing a procedure for fitting the stabilizer.

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

  1 to 5 show an embodiment of a power transmission device according to the present invention. As shown in FIG. 1, the 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 pulley (2) (3) wound around (pulling transmission member) (4), and a casing (5) for housing them, A stabilizer (6) that regulates the movement of the power transmission chain (4) by inserting the string part of the power transmission chain (4) (part not regulated by the pulley (2) (3)) so that it can move relative to the string (6) And a cylindrical fixing stopper (7) provided on the casing (5).

  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 stabilizer (6) is supported by the power transmission chain (4) and can move in the moving direction as the power transmission chain (4) moves in the traveling direction. As shown in FIG. 1, a rib (6a) is provided that restricts movement of the stabilizer (6) by a predetermined amount or more by contacting the fixed stopper (7). The stabilizer (6) is not supported by the casing (5). When the power transmission chain (4) changes from the U / D state to the O / D state, the two-dot chain line and the solid line in FIG. As shown, the inclination angle is changed according to the movement of the power transmission chain (4). Further, the pair of ribs (6a) of the stabilizer (6) are provided so as to face each other via a fixed stopper (7) provided on the casing (5), and the interval between the ribs (6a) is fixed. The size of the stabilizer (6) is made larger than the size of (8), so that the stabilizer (6) can move a little in the moving direction as the power transmission chain (4) moves in the moving direction.

  As shown in FIGS. 2 to 5, the stabilizer (6) has a first half (21) and a second half of the same shape that are opposed to each other and sandwich the string portion of the power transmission chain (4) from both sides. Part (22).

  An L-shaped engagement protrusion (23) is formed in the vicinity of one end of the abutment surface of each half (21) (22), and an engagement protrusion (23 in the vicinity of the other end is formed. ) Is formed. The first half (21) and the second half (22) are an engagement protrusion (23) of the first half (21) and an engagement groove (24 of the second half (22)). Are engaged with each other, and the engagement protrusion (23) of the second half (22) and the engagement groove (24) of the first half (21) are engaged with each other.

  The engaging protrusion (23) includes a vertical portion (31) extending outward in the vertical direction from the vicinity of the end of the abutting surface, and a lengthwise inward (end portion) parallel to the abutting surface from the outer end of the vertical portion (31). And a parallel part (32) extending in the direction away from the center. A locking claw (33) protruding toward the abutting surface is provided at the tip of the parallel part (32). The locking claw (33) has a right triangle shape having an inclined surface inclined so as to gradually approach the abutting surface from the tip of the parallel portion (32).

  The engaging groove (24) has an L-shaped engaging portion (41) that engages with the L-shaped engaging protrusion (23), and an insertion that allows the entire engaging protrusion (23) to be inserted in the width direction. Part (42).

  As shown in FIG. 5, the first half (21) and the second half (22) are shifted in the length direction so that the engagement protrusions of one half (21) (22) are engaged. (23) is opposed to the insertion part (42) of the engagement groove (24) of the other half part (21) (22) (FIG. 5 (a)), so that the abutting surfaces are abutted with each other. (FIG. 5B, solid line). Then, after being abutted in this way, both halves (21) and (22) are slid along the abutting surface in the length direction (FIG. 5 (b) two-dot chain lines), and each half ( 21) The engagement protrusions 23 of 22 and the engagement portion 41 of the engagement groove 24 are engaged (FIG. 3).

  As shown in FIG. 4 in an enlarged manner, the engagement protrusion (23) is parallel to the engagement portion (41) of the engagement groove (24) of each half (the second half (22) is shown). A retaining portion (43) is provided to face the portion (32) from the abutting surface side and prevent the slipping in the width direction. The retaining portion (43) includes a butting surface (43a) that abuts against the abutting surface of the other half portion (21), and a tip surface (43b) that abuts against the vertical portion (31) of the engaging protrusion (23), It has a parallel surface (43c) parallel to the abutting surface (43a), and a rectangular convex portion (44) extending outward in the vertical direction is provided at the tip of the parallel surface (43c). The convex portion (44) is smaller in thickness than the thickness including the engaging claw (33) of the parallel portion (32) of the engaging protrusion (23), and the distance between the tip surface thereof and the bottom surface of the engaging groove (24). The tip position is set so as to be larger than the thickness not including the locking claw (33). When both halves (21) and (22) are slid in the length direction along the abutting surfaces, the locking claws (33) are elastically deformed so that the inclined surfaces get over the convex portions (44). After getting over, the protrusion (44) is engaged to prevent the movement in the disengagement direction.

  According to the power transmission device (1), since the movement in the direction orthogonal to the traveling direction of the string portion of the power transmission chain (4) is regulated by the stabilizer (6), the string vibration is reduced. Here, if play occurs in the width direction (perpendicular to the abutting surface), a gap (indicated by G in FIG. 2) between the stabilizer (6) and the power transmission chain (4), which has a large effect on noise, is generated. It changes and adversely affects the noise, but as described above, after one half (21) and the other half (22) are offset in the length direction and face each other, both halves (21) Since (22) is slid along the abutting surface, the corresponding engaging protrusion (23) and the engaging groove (23) are engaged with each other. There is no backlash in the direction, and the gap G between the stabilizer (6) and the power transmission chain (4) is maintained at a constant value, and the adverse effect on noise is reduced.

  As for the shapes of the engaging protrusion (23) and the engaging groove (24), one half (21) and the other half (21) of the stabilizer (6) are shifted toward the transmission member. Then, the half projections (23) and the engagement grooves (24) are engaged with each other by sliding both halves (21) (22) along the abutment surface and sliding them toward the transmission member. If it is made to do, it is not limited to the said shape.

  In FIG. 1, the stabilizer (6) is provided on the lower side (portion from the primary pulley (2) to the secondary pulley (3)), but on the upper side (secondary pulley (3) to the primary pulley (3). It may be provided on the pulley (2), or on both the upper and lower sides.

(1) Power transmission device
(2) (3) Pulley
(4) Power transmission chain (wound transmission member)
(5) Casing
(6) Stabilizer
(21) First half
(22) Second half
(23) Engagement protrusion
(24) Engaging groove
(31) Vertical section
(32) Parallel part
(33) Locking claw
(41) Engagement part
(42) Insertion section
(43) Retaining part
(44) Convex

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 And a stabilizer that regulates the movement of the winding transmission member by being inserted so as to be relatively movable, and the stabilizer is abutted against each other, and a first half that sandwiches the string portion of the winding transmission member from both sides, and In the power transmission device comprising the second half,
The first half and the second half of the stabilizer have the same shape, and an engagement protrusion and an engagement groove are formed on the abutment surface of each half, and the engagement groove is an engagement protrusion. And an insertion portion that is provided in succession to be able to insert the entire engagement protrusion, and thereby the first half and the second half are: After the engaging projection of one half is inserted into the engaging groove from the insertion portion of the other half, both halves are slid along the abutting surface to engage with the engaging projection. A power transmission device characterized by engaging with an engaging portion of a groove.   The engaging protrusion includes a vertical portion extending vertically outward from the abutting surface and a parallel portion extending in parallel with the abutting surface from the outer end of the vertical portion, toward the end of the parallel portion of the engaging protrusion toward the abutting surface. A locking claw that protrudes is provided, and an engaging portion of the engaging groove is provided with a retaining portion that faces the parallel portion of the engaging projection from the abutment surface side. The power transmission device according to claim 1, further comprising a convex portion that prevents the engagement protrusion from moving in the disengagement direction.

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