JP2012002303A - Power transmission device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power transmission device in which the assembly of a stabilizer for restricting the movement of a winding transmission member is simplified.
A stabilizer 6 has a substantially U-shape when viewed from the direction of travel of a wrapping transmission member 4, and is formed by extending the center part in the longitudinal direction of a pair of side walls 21 of the stabilizer 6. In addition, a pair of mounting walls 23 is formed with a hole having a circular section as an insertion portion 24 through which the support shaft 8 is inserted.
[Selection] Figure 2

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 guide rail that regulates the movement of the winding transmission member 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.

JP 2009-85397 A

  In order to regulate the movement of the winding transmission member by the stabilizer, it is considered that the stabilizer is composed of two parts so that the cross-sectional shape of the main body is a square, and the winding transmission member is sandwiched between these two parts. However, in this case, there is a problem that the connecting portion of the two parts becomes complicated and difficult to assemble, and it takes time to assemble the stabilizer.

  An object of the present invention is to provide a power transmission device that simplifies the assembly of a stabilizer that restricts the movement of a winding transmission member.

  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 between both pulleys, and a casing that accommodates these members. In a power transmission device comprising a stabilizer that is supported by a support shaft provided in the casing and that restricts the movement of the winding transmission member by allowing the string portion of the winding transmission member to be inserted in a relatively movable manner. The stabilizer has a substantially U shape when viewed from the direction of travel of the winding transmission member, and a pair of mounting walls formed by extending the longitudinal center of the pair of side walls of the stabilizer, An insertion portion through which the support shaft is inserted is formed.

  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.

  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. The support shaft is rotatably supported by the casing so as to be rotatable around. In order to enable the stabilizer to rotate about the axis of the support shaft, the support shaft may be supported by the casing so as not to rotate, and the stabilizer may be rotatably supported by the support shaft. The stabilizer may be rotatably supported by the support shaft and may be rotatably supported by the support shaft.

  The stabilizer is composed of a pair of side walls facing each other and a connecting wall that connects the base ends of both side walls, and the wound transmission member has a slight gap from both sides to the pair of side walls of the stabilizer. And is moved with a slight gap between the connecting wall of the stabilizer and the support shaft from both sides in the radial direction, thereby reducing string vibration.

  Conventionally, the stabilizer is made up of two parts, and is attached so that the wound transmission member after being wound between both pulleys is sandwiched from both sides. The two parts are joined together by welding, welding, screwing, etc. There was a need to do. In the power transmission device according to the present invention, since the stabilizer has a U-shaped cross section, the stabilizer can be configured with one component, and the trouble of integrating the two components can be eliminated.

  The casing is formed, for example, by abutting a bottomed cylindrical main body and a lid. In this case, the support shaft has a circular cross section and rotates between the bottom wall of the main body and the bottom wall of the lid. It is passed over as possible. As a form at this time, for example, a bottomed hole for fitting the end of the support shaft into the bottom wall of the main body and the lid is provided, and the end of the support shaft is loosely fitted into the bottomed hole (to be rotatable). ) Can be fitted. The stabilizer is assembled to the support shaft after being wound around the substantially U-shaped portion surrounded by the pair of side walls and the connecting wall and housing the transmission member.

  The insertion portion through which the support shaft is inserted is a circular hole and may be fitted to the support shaft from one end side of the support shaft, and the insertion portion through which the support shaft is inserted is a mounting wall. There is a case where the notch is opened to the extended end side of the support shaft and is fitted to the support shaft from a direction orthogonal to the support shaft. In the former form, the stabilizer may be assembled to the support shaft and then attached to the casing body. In the latter form, one end of the support shaft is supported on the bottom wall of the casing body. The stabilizer may be assembled to the support shaft, or the stabilizer may be assembled to the support shaft and then the support shaft may be attached to the casing body.

  The material of the support shaft and the stabilizer may be metal or synthetic resin. Preferably, both are synthetic resins. When the insertion portion is a notch, the support shaft and the stabilizer can be easily coupled by fitting the synthetic resin members together.

  According to the power transmission device of the present invention, the stabilizer has a substantially U-shape when viewed from the advancing direction of the winding transmission member, and is formed by extending the longitudinal center portion of the pair of side walls of the stabilizer. Since the insertion portion through which the support shaft is inserted is formed on the pair of mounting walls formed, the labor of connecting the stabilizers as two parts is not required, the number of parts is reduced, and the stabilizer assembly Attachment is simplified.

FIG. 1 is a front view showing a first embodiment of a power transmission device according to the present invention. 2A and 2B are enlarged views of a main part of the first embodiment, in which FIG. 2A is a front view, and FIG. 2B is a cross-sectional view taken along line bb in FIG. FIGS. 3A and 3B are diagrams showing a main part of a second embodiment of the power transmission device according to the present invention, in which FIG. 3A is a front view and FIG. 3B is a cross-sectional view taken along line bb in FIG.

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

  1 and 2 show a first embodiment of a power transmission device according to the present invention. A power transmission device (1) includes a primary pulley (2) composed of a fixed sheave and a movable sheave, and a fixed sheave and a movable sheave. The secondary pulley (3), the two pulleys (2) and (3) are wound around the winding transmission member (4), the casing (5) for accommodating them, and the support shaft (8). A stabilizer that regulates the movement of the winding transmission member (4) by inserting the string portion of the winding transmission member (4) (part not regulated by the pulley (2) (3)) so as to be relatively movable. And 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 of the winding transmission member (4) is the smallest and the winding diameter on the secondary pulley (3) side is the largest. In the O / D state (indicated by solid and broken lines in FIG. 1), the opposite is true.

  Although not shown, the casing (5) is formed by abutting a bottomed cylindrical main body and a lid, and the support shaft (8) is located between the bottom wall of the main body and the bottom wall of the lid. It is spanned to be rotatable. Thereby, the stabilizer (6) is rotatable around the axis of the support shaft (8), and when the winding transmission member (4) changes from the U / D state to the O / D state, As shown by a two-dot chain line and a solid line in FIG. 1, the inclination angle is changed in accordance with the change in the shape of the winding transmission member (4).

  The stabilizer (6) is made of synthetic resin, and the shape of the winding transmission member (4) viewed from the advancing direction is substantially U-shaped, and a main body that forms a passage for the winding transmission member (4) ( 11) and an attachment portion (12) for attaching the stabilizer (6) to the support shaft (8).

  As shown in FIG. 2, the main body (11) is composed of a pair of side walls (21) facing each other and a connecting wall (22) for connecting the base ends of both side walls (21) to each other. Consists of a pair of mounting walls (23) formed by extending the longitudinal center of the pair of side walls (21) of the main body (11). Each attachment wall (23) is formed with an insertion portion (24) through which the support shaft (8) is inserted.

  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 stabilizer (6) has a U-shaped cross section, the stabilizer (6) can be configured with one component, and the time and effort of integration in the conventional device including two components can be eliminated.

  As shown in FIG. 2, in the stabilizer (6) of 1st Embodiment, the insertion part (24) is made into the circular hole, and it fits into the support shaft (8) from the one end part side of the support shaft (8). Therefore, in the first embodiment, there is no possibility that the stabilizer (6) falls off from the support shaft (8).

  FIG. 3 shows a stabilizer (7) of the second embodiment, and a main body (11) of the stabilizer (7) is formed of a pair of side walls (26) and side walls (26) facing each other. It consists of a connecting wall (27) that connects the ends, and the mounting portion (12) is a pair of mounting walls formed by extending the longitudinal center of the pair of side walls (26) of the main body (11). (28). Each mounting wall (28) has an insertion portion (29) through which the support shaft (8) is inserted.

  The insertion portion (29) is a notch that opens to the extended end side of the mounting wall (28), and is fitted to the support shaft (8) from a direction orthogonal to the support shaft (8). The notch has a C shape (a shape obtained by removing a part of the circle), the depth is larger than the radius of the original circle, and the size of the opening is the original. It is made slightly smaller than the diameter of the circle. The stabilizer (7) is made of synthetic resin and can be slightly elastically deformed when fitted with the support shaft (8). Therefore, in the second embodiment, the stabilizer (7) can be forcibly fitted to the intermediate portion of the support shaft (8), so that the stabilizer (7) can be removed from the support shaft (8). Since the stop is achieved, the assembly can be performed more easily.

(2) (3) Pulley
(4) Wound transmission member
(5) Casing
(6) (7) Stabilizer
(8) Support shaft
(21) (26) Side wall
(23) (28) Mounting wall
(24) (29) Insertion section

Claims (3)

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 them, and a support provided in the casing In a power transmission device including a stabilizer that is supported by a shaft and that restricts movement of the winding transmission member by inserting a string portion of the winding transmission member so as to be relatively movable,
The stabilizer has a substantially U shape when viewed from the direction of travel of the winding transmission member, and a pair of mounting walls formed by extending the longitudinal center of the pair of side walls of the stabilizer, A power transmission device, wherein an insertion portion through which the support shaft is inserted is formed.   The power transmission device according to claim 1, wherein the insertion portion through which the support shaft is inserted is a circular hole and is fitted to the support shaft from one end side of the support shaft.   The power transmission device according to claim 1, wherein the insertion portion through which the support shaft is inserted is a notch that opens to the extended end side of the mounting wall, and is fitted to the support shaft from a direction orthogonal to the support shaft.

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