JP5521988B2 - Power transmission device - Google Patents

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 conventional power transmission device, the support shaft and the stabilizer are separate components, and the stabilizer is attached to the support shaft so that the support shaft is sandwiched from both sides by a pair of clamping walls provided in the stabilizer. Here, the stabilizer needs to move corresponding to the winding transmission member that changes its shape by changing the gear ratio, so it can move relative to the support shaft (at least around the axis of the support shaft) In the case where the stabilizer is made of synthetic resin, there is a possibility that the stabilizer becomes loose due to wear of the holding wall. Therefore, a metal reinforcing material for improving wear resistance is attached to the pair of holding walls. In this case, the reinforcing material is prevented from coming off from the openings of the pair of holding walls of the stabilizer. There is a need.

  An object of the present invention is to provide a power transmission device that can reliably prevent a reinforcing material for improving wear resistance from falling out of a stabilizer.

  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 the 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 support shaft that supports the stabilizer, the stabilizer is a main body. And a pair of sandwiching walls that are provided integrally with the main body and sandwich the support shaft from both sides, and a reinforcing member that protects the inner surface of the pair of sandwiching walls of the stabilizer is provided. The stabilizer has a wall and a pair of side walls, and is provided with a convex portion protruding outward at at least one of the bottom wall and the pair of side walls. The body or the holding wall is provided with a concave portion into which the convex portion of the reinforcing material is fitted. By fitting the convex portion of the reinforcing material and the concave portion of the stabilizer, the reinforcing material can be removed from the opening portions of the pair of holding walls. It is characterized by being prevented.

  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 has, for example, a rectangular cross section, and sandwiches the power transmission member from both sides by two parts (the first half and the second half) constituting the stabilizer, and is supported through a pair of clamping walls. Mounted on the shaft. 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. For this reason, the stabilizer is the axis of the support shaft. It is supported by the support shaft so as to be able to rotate around, and the stabilizer is allowed to move to some extent relative to the support shaft. Therefore, if the stabilizer is made of a synthetic resin, the stabilizer may be worn, and play may occur. For example, in order to protect the inner surface of the pair of sandwiching walls of the stabilizer, the stabilizer is made of, for example, metal. It is preferable to arrange the reinforcing material.

  The reinforcing material has a bottom wall and a pair of side walls. The holding wall is provided with a recess corresponding to the thickness of the reinforcing material so that the side wall of the reinforcing material can be accommodated in the recess. This prevents the reinforcing material from coming off. However, in order to prevent this from coming off, there is a problem that when the portion of the sandwiching wall that is not reinforced by the reinforcing material is worn due to long-term use, the retaining function may be lowered and the reinforcing material may fall off. .

  Therefore, in the power transmission device according to the present invention, a convex portion protruding outward is provided at least at one of the bottom wall and the pair of side walls of the reinforcing material, and the convex portion of the reinforcing material is provided on the stabilizer main body or the sandwiching wall. A recess is provided in which the protrusion of the reinforcing material is fitted into the concave portion of the stabilizer and the recess of the stabilizer is prevented from slipping out of the opening of the pair of holding walls. This retaining function is preferably added to the above-described retaining function that “a recess corresponding to the thickness of the reinforcing material is provided in the holding wall so that the side wall of the reinforcing material can be accommodated in this recess”. .

  By doing so, even if a portion of the sandwiching wall that is not reinforced by the reinforcing material is worn out due to long-term use, the retaining function is maintained, and the reinforcing material is reliably prevented from falling off.

  The stabilizer includes a first half and a second half. Correspondingly, the reinforcing member has a portion held in the first half and a portion held in the second half. It is a separate member. For example, the first half and the second half of the stabilizer are coupled by fitting a convex portion provided in each half portion into a concave portion provided in each half portion.

  Further, the stabilizer is composed of a first half and a second half, and the reinforcing member is formed by integrating a portion held in the first half and a portion held in the second half, The reinforcing member is fitted between the pair of holding walls of each half of the stabilizer with a tightening margin, so that the first half and the second half are joined via the reinforcing member. You may do it. In this case, the convex portions provided in the respective half portions may be coupled by being fitted into the concave portions provided in the respective half portions, and the coupling by the fitting may be omitted. In the former case, there is an advantage that the play in the fitting portion between the convex portion and the concave portion is eliminated by the coupling by the reinforcing material, and in the latter case, the configuration of the coupling is simplified, and the first half and the first half There is an advantage that it is possible to eliminate the occurrence of backlash at the abutting portion between the two halves.

  The convex part of the reinforcing material may be formed by extending the bottom wall beyond the side wall. In this case, the reinforcing material is inserted between the pair of sandwiching walls from the abutting surface side of each half of the stabilizer. As a result, the reinforcing material can be easily held by the stabilizer, and the reinforcing material is prevented from coming off after being held.

  The convex portion of the reinforcing material may be formed by cutting and raising a part of the side wall at the central portion in the length direction. In this case, the reinforcing material may be inserted between the pair of sandwiching walls from the abutment surface side of each half of the stabilizer. However, by utilizing the fact that the cut and raised portion is easily elastically deformed, It can be inserted from the opening side. This facilitates the mounting work of the reinforcing material.

  The convex part of the reinforcing material may be a bent part provided in the middle of the side wall in the height direction. In this case, the reinforcing material is inserted between the pair of sandwiching walls from the abutting surface side of each half of the stabilizer. The bent portion can be formed continuously before and after the step of forming the reinforcing material into a U-shape consisting of a bottom wall and a pair of side walls, and the manufacturing of the reinforcing material becomes simple.

  The convex portion of the reinforcing material is formed so as to protrude downward from the center portion of the bottom wall, and the concave portion is formed in the main body of the stabilizer, and the convex portion may be press-fitted into the concave portion. In this case, the reinforcing material is press-fitted from, for example, the opening side of the holding wall.

  According to the power transmission device of the present invention, the stabilizer has a main body and a pair of sandwiching walls that are provided integrally with the main body and sandwich the support shaft from both sides, and protect the inner surfaces of the pair of sandwiching walls of the stabilizer. A reinforcing member is provided, and the reinforcing member has a bottom wall and a pair of side walls, and has a convex portion protruding outward at at least one position of the bottom wall and the pair of side walls, and a stabilizer body. Alternatively, the sandwiching wall is provided with a recess into which the convex portion of the reinforcing material can be fitted, and the convex portion of the reinforcing material and the concave portion of the stabilizer are fitted together to prevent the reinforcing material from coming off from the opening of the pair of sandwiching walls. Therefore, even if the portion of the sandwiching wall that is not reinforced by the reinforcing material is worn out due to long-term use, the retaining function is maintained and the reinforcing material is reliably prevented from falling off.

FIG. 1 is a front view showing a first embodiment of a power transmission device according to the present invention. FIG. 2 is an enlarged front view showing a main part of the first embodiment of the power transmission device according to the present invention. FIG. 3 is a perspective view showing a reinforcing member of the first embodiment of the power transmission device according to the present invention. FIG. 4 is a side view showing a state in which the reinforcing member of the first embodiment of the power transmission device according to the present invention is incorporated in a stabilizer. FIG. 5 is a perspective view showing a reinforcing member of a second embodiment of the power transmission device according to the present invention, wherein (a) shows a state in the middle of manufacture, and (b) shows a finished product. FIG. 6 is an enlarged front view showing a main part of a third embodiment of the power transmission device according to the present invention. FIG. 7 is an enlarged front view showing a main part of a fourth embodiment of the power transmission device according to the present invention. FIG. 8 is a plan view showing the assembling order of the stabilizer when the reinforcing member is a split type in the power transmission device according to the present invention. FIG. 9 is a plan view showing the assembling order of the stabilizer when the reinforcing material is integrated in the power transmission device according to the present invention. FIG. 10 is an enlarged front view showing a main part of a comparative example of the power transmission device according to the present invention.

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

  FIGS. 1 to 4 show a first 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) composed of 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 around both pulleys (2) and (3), a casing (5) for housing them, and a winding Stabilizer (6) that regulates the movement of the winding transmission member (4) by inserting the string portion (the part not regulated by the pulley (2) (3)) of the hanging transmission member (4) 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.

  The stabilizer (6) is made of a synthetic resin and has a split shape. The stabilizer (6) is sandwiched between both pulleys (2) and (3) with the wound transmission member (4) sandwiched from both sides. This is attached to the winding transmission member (4). The cross section of the central portion of the stabilizer (6) is formed in a square having a size that allows the winding transmission member (4) to be inserted with some play. Thereby, the string portion of the winding transmission member (4) is inserted into the stabilizer (6) so as to be relatively movable, and the movement in the direction orthogonal to the traveling direction of the string portion of the winding transmission member (4) is stabilized ( It is regulated by 6).

  The stabilizer (6) is made of synthetic resin, and has a main body (11) and a pair of clamping walls (12) that are provided integrally with the main body (11) and sandwich the support shaft (7) from both sides. .

  The support shaft (7) is fixed to the casing (5), and the stabilizer (6) is rotatable about 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.

  When the power transmission device changes between the U / D state and the O / D state, the stabilizer (6) needs to move in accordance with the change in the shape of the winding transmission member. Therefore, the stabilizer (6 ) Is supported by the support shaft (7) so as to be rotatable about the axis of the support shaft (7), and the stabilizer (6) is allowed to move to some extent relative to the support shaft (7). Therefore, if the stabilizer (6) is made of a synthetic resin, the stabilizer (6) may be worn and play may occur. Therefore, in order to protect the inner surface of the pair of sandwiching walls (12) of the stabilizer (6), a metal reinforcing material (13) is disposed between the pair of sandwiching walls (12) of the stabilizer (6). .

  As shown in FIGS. 2 to 4, the reinforcing member (13) has a bottom wall (21) and a pair of side walls (22). In order to prevent the reinforcing material (13) from coming off from the clamping wall (12), the inner surface of the clamping wall (12) is provided with a recess (14) corresponding to the thickness of the reinforcing material (13). The side wall (22) of the reinforcing member (13) is accommodated in the recess (14). In addition to this, the reinforcing material (13) is formed with a convex portion (23) protruding from the side wall (22) by extending the bottom wall (21) beyond the side wall (22), The convex part (23) of the reinforcing member (13) is fitted with the concave part (15) formed in the base part of the sandwiching wall (12), thereby also from the opening part of the pair of sandwiching walls (12). This prevents the reinforcing material (13) from coming off.

  As shown in FIGS. 2 and 3, the reinforcing member (13) including the convex portion (23) has an inverted square shape. As shown in FIG. 4, the reinforcing member (13) is inserted between the pair of sandwiching walls (12) from the abutting surface side of each half (6a) of the stabilizer (6).

  In the case of the reinforcing material (51) shown in FIG. 10, when a portion of the sandwiching wall (12) that is not reinforced by the reinforcing material (51) is worn due to long-term use, the recess on the inner surface of the sandwiching wall (12) is worn. With (14) alone, there is a problem in that the step-off surface of the recess (14) is shaved and the retaining function is lowered.

  On the other hand, in the embodiment shown in FIGS. 2 to 4, even if the portion of the sandwiching wall (12) that is not reinforced by the reinforcing material (13) is worn out over a long period of time, the reinforcing material (13) By fitting the convex portion (23) and the concave portion (15) of the stabilizer (6), the reinforcing material (13) can be reliably prevented from coming off from the opening of the pair of holding walls (12).

  The convex portion (23) formed on the reinforcing material (13) and the concave portion (15) formed on the holding wall (12) correspondingly to the convex portion (23) are not limited to those described above. As shown up to 7, various shapes can be used.

  In the second embodiment shown in FIG. 5, the convex portion (32) of the reinforcing member (31) is formed by cutting and raising the lower end portion of the side wall (31b) of the reinforcing member (31) at the central portion in the length direction. Tongue-like piece. When viewed from the front, this reinforcing member (31) has the same shape as the reinforcing member (13) shown in FIG. 2 (the same width as the bottom wall (21) and the side wall (22) in the first embodiment). The convex portion (23) is replaced with a narrow convex portion (32)), and in the same manner as in FIG. 4, from the butt surface side of each half portion (6a) of the stabilizer (6) It can be inserted between a pair of clamping walls (12). On the other hand, the convex portion (32) of the second embodiment is formed by cutting up as compared with the convex portion (23) of the first embodiment, which has the same width as the bottom wall (21) and the side wall (22). It has a tongue shape that can be elastically deformed, and can be fitted between the holding walls (12) from the opening side of the pair of holding walls (12) (corresponding to the upper side in FIG. 2). it can.

  When forming the reinforcing material (31), a step of forming a notch for forming the convex portion (32) on the flat plate shown in FIG. 5 (a), and bending the flat plate shown in FIG. (31a) and the side wall (31b) can be formed, and the process of projecting the convex portion (32) can be continuously performed, so that the reinforcing material (31) can be easily manufactured.

  In the third embodiment shown in FIG. 6, the convex portion (37) of the reinforcing member (36) is a bent portion having a substantially arc-shaped vertical section provided in the middle of the side wall (36a) in the height direction. The concave portion (38) has a substantially arc shape in vertical cross section, and is formed in the middle of the holding wall (12) in the height direction. This reinforcing material (36) is inserted between the pair of holding walls (12) from the abutting surface side of each half (6a) of the stabilizer (6), as shown in FIG. When forming this reinforcing material (36), the step of forming a bent portion on the flat plate and the step of bending the flat plate to form the bottom wall (36a) and the side wall (36b) can be performed continuously. The reinforcing material (36) can be easily manufactured.

  In the fourth embodiment shown in FIG. 7, the convex portion (42) of the reinforcing member (41) is formed so as to protrude downward from the central portion of the bottom wall (41a). (43) is formed in the main body (11) of the stabilizer (6). The convex portion (42) has a width (thickness) slightly larger than the width of the concave portion (43) and is press-fitted into the concave portion (43).

  The reinforcing material (13) (31) (36) (41) of each of the first to fourth embodiments is a split type that can be attached to each half (6a) of the stabilizer (6) first. As shown in FIG. 8, split reinforcements (31A) and (31B) (same as reinforcements of (13), (36), and (41)) in each half (6a) and (6b) of the stabilizer (6) Then, the half portions (6a) and (6b) of the stabilizer (6) are joined together by fitting the convex portions (24) and the concave portions (25).

  As shown in FIG. 9, the reinforcing member (31 ′) (same as the reinforcing member of (13), (36), and (41)) is a portion held by the first half (6a) of the stabilizer (6). The part held by the second half (6b) may be integrated, and in this case, each half of the stabilizer (6) to which the reinforcing material (31 ') is not attached. (6a) (6b) are faced to each other (Fig. 9 (a)), and then the reinforcing material (31 ') is a pair of clamping walls of each half (6a) (6b) of the stabilizer (6) (12) is fitted so as to straddle both halves (6a) and (6b) (FIG. 9 (b)). In this fitting, the distance between the outer surface of the side walls of the reinforcing material (31 ′) is slightly larger than the distance between the inner surfaces of the holding wall (12), so that the reinforcing material (31 ′) is tightened to a predetermined level. It has a margin and is fitted between the holding walls (12). Thereby, the 1st half part (6a) and 2nd half part (6b) of a stabilizer (6) are couple | bonded via a reinforcing material (31 '). A stabilizer (31 ') in which a portion held by the first half (6a) and a portion held by the second half (6b) of the stabilizer (6) are integrated into the stabilizer (6). To attach, the reinforcing material (31 ') is first attached to one of the halves (6a) and (6b) shown in FIG. 9 (a), and then each half of the stabilizer (6) is attached. The parts (6a) and (6b) may be coupled to each other (FIG. 9B). According to the configuration shown in FIG. 9 (b), the butt portion between the first half (6a) and the second half (6b) of the stabilizer (6) using the reinforcing material (31 '). It is possible to eliminate the occurrence of backlash.

  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, the synthetic resin stabilizer (6) is protected by the metal reinforcing members (13), (31), (36), and (41), so that the durability is excellent. Also, the protrusions (23) (32) (37) (42) of the reinforcement (13) (31) (36) (41) and the recesses (15) (33) (38) (43) of the stabilizer (6) The reinforcing wall (12) is reinforced by preventing the reinforcing members (13), (31), (36) and (41) from coming off from the openings of the pair of holding walls (12). Even if the portions not reinforced by the materials (13), (31), (36), and (41) are worn out, the reinforcing materials (13), (31), (36), and (41) are prevented from falling off.

  In FIG. 1, the stabilizer (6) is provided on the lower side (portion from the primary pulley (2) to the secondary pulley (3)), but 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) Dynamic winding transmission member
(5) Casing
(6) Stabilizer
(7) Support shaft
(11) Body
(12) Retaining wall
(13) (31) (36) (41) Reinforcing material
(15) (33) (38) (43) Recess
(21) (31a) (36a) (41a) Bottom wall
(22) (31b) (36b) Side wall
(23) (32) (37) (42) Convex
(31 ') Integrated reinforcement

Claims (6)

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 has a main body and a pair of clamping walls that are provided integrally with the main body and sandwich the support shaft from both sides, and is provided with a reinforcing material that protects the inner surfaces of the pair of clamping walls of the stabilizer. The material has a bottom wall and a pair of side walls, and is provided with a convex portion projecting outward at at least one position of the bottom wall and the pair of side walls. A recess is provided in which the portion is fitted, and the reinforcing member is prevented from coming off from the opening of the pair of holding walls by fitting the convex portion of the reinforcing member and the concave portion of the stabilizer. Transmission device.   The stabilizer is composed of a first half and a second half, and the reinforcing material is a unit in which a portion held in the first half and a portion held in the second half are integrated. Yes, the first half and the second half are joined via the reinforcing material by fitting the reinforcing material between the pair of holding walls of each half of the stabilizer with a fastening margin. The power transmission device according to claim 1, wherein:   3. The power transmission device according to claim 1, wherein the convex portion of the reinforcing member is formed by extending the bottom wall beyond the side wall.   The power transmission device according to claim 1, wherein the convex portion of the reinforcing material is formed by cutting and raising a part of the side wall at a central portion in the length direction.   The power transmission device according to claim 1, wherein the convex portion of the reinforcing material is a bent portion provided in the middle of the side wall in the height direction.   The convex portion of the reinforcing material is formed so as to protrude downward from the center portion of the bottom wall, the concave portion is formed in the main body of the stabilizer, and the convex portion is press-fitted into the concave portion. Item 3. The power transmission device according to item 1 or 2.

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