JP2011132984A - Pulley fastening structure and method in continuously variable transmission - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pulley fastening structure suitable for a continuously variable transmission adopting a compact constitution. <P>SOLUTION: In a continuously variable transmission which transmits an engine rotation inputted to an input shaft 2 to a driving pulley shaft 10 through the medium of a gear mechanism 9 and a rotation of the driving pulley shaft 10 to a driving wheel through the medium of an endless belt 6 hung over the driving pulley 11 arranged in the driving pulley shaft 10, the gear mechanism 9 comprises a drive transmission gear 9a arranged so as to be relatively rotatable to the input shaft 2 and a driven transmission gear 9b fixed to the drive pulley shaft 10. The driven transmission gear 9b has a structure (a hole 51) for allowing temporary fixing by a jig 50, and fixes the drive pulley shaft 10 by temporarily fixing the driven transmission gear 9b through the medium of the jig 50 and fixes an hydraulic cylinder chamber 14 in the drive pulley 11 at a prescribed position of the drive pulley shaft 10 by tightening a nut 18 screwed in the drive pulley shaft 10. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a pulley fastening structure and method in a belt type continuously variable transmission (CVT) used in an automobile or the like.

  As an example of a belt-type continuously variable transmission, the one disclosed in Patent Document 1 below is known. The pulley fastening structure in the prior art will be described with reference to FIG. 3. The driving pulley 41 includes a fixed pulley half 41 a provided on the driving pulley shaft 40 and an axial direction at a position facing the fixed pulley half 41 a. The movable pulley half 41b is disposed so as to be linearly movable. A hydraulic cylinder chamber 43 surrounded by a pulley cover 42 is formed on the back side of the movable pulley half 41b. When the drive pulley 41 is assembled, the movable pulley half 41b and the pulley cover 42 are assembled to the drive pulley shaft 40 on which the fixed pulley half 41a is disposed, and the nut 44 that is screwed to the drive pulley shaft 40 is tightened. Thus, the pulley cover 42 is fixed at a predetermined position on the drive pulley shaft 40. Spline teeth 45 are formed at one end of the drive pulley shaft 40 (the end opposite to the threaded portion engaged with the nut 44), and the forward / reverse switching clutch portion (not shown) is formed via the spline teeth 45. ) To spline. In this conventional example, when assembling the drive pulley 41 on the drive pulley shaft 40, the nut 44 is tightened by coupling the drive pulley shaft 40 to the forward / reverse switching clutch portion via the spline coupling portion. The driving pulley shaft 40 can be relatively fixed (temporarily fixed) and can be tightened firmly.

JP 2009-68681 A

  In the fastening structure as in the above conventional example, since it is necessary to provide the spline teeth 45 at one end of the drive pulley shaft 40, there is a problem that the length of the shaft is increased correspondingly and a lot of space is required. In addition, there is a problem that the weight increases accordingly. Therefore, it is not suitable for a transmission employing a compact configuration.

  The present invention has been made in view of the above points, and an object of the present invention is to provide a novel pulley fastening structure and method suitable for a continuously variable transmission employing a compact configuration.

  The pulley fastening structure in the continuously variable transmission according to the present invention transmits the rotation of the engine input to the input shaft (2) to the drive pulley shaft (10) via the gear mechanism (9), and the drive pulley shaft ( In the continuously variable transmission that transmits the rotation of 10) to the drive wheels via the endless belt (6) that is stretched over the drive pulley (11) disposed on the drive pulley shaft (10), the gear mechanism (9 ) Includes a drive transmission gear (9a) arranged to be rotatable relative to the input shaft (2), and a driven transmission gear (9b) fixed to the drive pulley shaft (10). (9a) is a nut that is coupled to the input shaft (2) via a clutch (4) disposed on the input shaft (2) and is screwed to the drive pulley shaft (10). By tightening (18), the drive pulley (11 The hydraulic cylinder chamber (14) is fixed to a predetermined position of the drive pulley shaft (10), and the driven transmission gear (9b) has a structure for enabling temporary fixing by the jig (50). And when tightening the nut (18), the driven transmission gear (9b) is temporarily fixed via the jig (50) to fix the drive pulley shaft (10), and the nut (18 It is characterized by enabling effective tightening by (). Note that the reference numbers in parentheses are examples of reference numbers for corresponding elements in the embodiments described later for reference.

  According to the present invention, the driven transmission gear (9b) has a structure for enabling temporary fixing by the jig (50), and when the nut (18) is tightened, the jig (50) is interposed via the jig (50). The drive pulley shaft (10) is fixed by temporarily fixing the driven transmission gear (9b) so that the nut (18) can be effectively tightened. As a result, there is no need to form spline teeth at one end of the drive pulley shaft as in the conventional example, and the length of the drive pulley shaft can be shortened. It can be advantageously applied in a transmission.

1 is a main cross-sectional view showing an example of the overall configuration of a transmission according to an embodiment of the present invention. The perspective sectional view for explaining the pulley fastening structure in the drive pulley shaft. The schematic sectional drawing for demonstrating the pulley fastening structure in a prior art example.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 is a main cross-sectional view showing an example of the overall configuration of a transmission according to an embodiment of the present invention. The transmission 1 shown in FIG. 1 is a belt type in which an endless V-belt 6 is wound between a driving pulley 11 provided on a driving pulley shaft 10 and a driven pulley 21 provided on a driven pulley shaft 20. A continuously variable transmission (CVT) 5 is provided.

  Further, the transmission 1 includes an input shaft 2 to which a driving force of a driving source (not shown) such as an engine is transmitted via a torque converter TC, and a forward clutch 4 is provided on the input shaft 2. Is arranged. On the other hand, a reverse clutch 7 is disposed on the drive pulley shaft 10. Between the input shaft 2 and the drive pulley shaft 10, the forward gear mechanism 9 that transmits the driving force from the input shaft 2 to the drive pulley shaft 10 by the engagement of the forward clutch 4, and the reverse clutch 7 A reverse gear mechanism 17 that transmits the driving force from the input shaft 2 to the driving pulley shaft 10 by engagement is provided. Thereby, the driving pulley shaft 10 of the belt type continuously variable transmission mechanism 5 is rotated by the driving force transmitted from the input shaft 2. On the other hand, the driving force from the driven pulley shaft 20 is transmitted to the left and right drive wheels (not shown) via the differential mechanism 8 and the left and right axle shafts 8a and 8b. The forward gear mechanism 9 includes a drive transmission gear 9a disposed so as to be rotatable relative to the input shaft 2, and a driven transmission gear 9b fixed to the drive pulley shaft 10, and the drive transmission gear 9a The input shaft 2 is coupled via a clutch 4 disposed on the shaft 2.

  The drive pulley 11 of the belt type continuously variable transmission mechanism 5 includes a fixed pulley half 11a provided on the drive pulley shaft 10 so as to rotate together with the drive pulley shaft 10, and a shaft at a position facing the fixed pulley half 11a. The movable pulley half 11b is disposed on the drive pulley shaft 10 so as to be relatively linearly movable in the direction. A cylinder chamber 14 surrounded by a pulley cover 12 is formed on the back side of the movable pulley half 11b (on the side opposite to the fixed pulley half 11a). The cylinder chamber 14 is supplied with hydraulic pressure adjusted by a hydraulic control valve (not shown). A drive side pressure (drive pulley side pressure) that moves the movable pulley half 11b in the axial direction is generated by the control hydraulic pressure supplied to the cylinder chamber 14.

  In order to fix the pulley cover 12 constituting the fixed wall surface of the cylinder chamber 14 at a predetermined position of the drive pulley shaft 10 and to fix the bearing 15 of the drive pulley shaft 10 at a predetermined position, a step of the drive pulley shaft 10 is provided. The inner diameter portion of the pulley cover 12 and the inner diameter portion of the bearing 15 are sandwiched between the portion 10 b and the nut 18, and tightened with the nut 18. The assembling method when tightening the nut 18 is related to the main part of the present invention, and details thereof will be described later.

  The driven pulley 21 is disposed on the driven pulley 21 so as to be relatively linearly movable in the axial direction at a position facing the fixed pulley half 21a and a fixed pulley half 21a fixed to the driven pulley shaft 20. The movable pulley half 21b is configured to be driven by the belt 6 and rotate integrally. A cylinder chamber 24 surrounded by a pulley cover 22 is formed on the back side of the movable pulley half 21b (the side opposite to the fixed pulley half 21a). The cylinder chamber 24 is regulated by a hydraulic control valve. Hydraulic pressure is supplied. The control hydraulic pressure supplied to the cylinder chamber 24 generates a driven side pressure (driven pulley side pressure) that moves the movable pulley half 21b in the axial direction.

  In the belt-type continuously variable transmission mechanism 5 having the above-described configuration, the V-belt 6 is controlled with respect to the drive pulley 11 and the driven pulley 21 by controlling the hydraulic pressure (drive side pressure and driven side pressure) supplied to the cylinder chamber 14 and the cylinder chamber 24. Gives side pressure without slippage. Further, the driving side pressure and the driven side pressure are controlled to be different from each other, the groove widths of the driving pulley 11 and the driven pulley 21 are appropriately changed, and the winding diameter of the V belt 6 is changed to thereby change the driving pulley. 11 and the driven pulley 21 are controlled in a stepless manner.

  The casing 30 that houses the components of the transmission 1 houses the torque converter case (hereinafter referred to as “TC case”) 31 that houses the torque converter TC and the belt-type continuously variable transmission mechanism 5. Transmission case (hereinafter referred to as “M case”) 35. The M case 35 has a cylindrical shape that surrounds the outer peripheral sides of the drive pulley 11 and the driven pulley 21 of the belt-type continuously variable transmission mechanism 5 and ends of the drive pulley shaft 10 and the driven pulley shaft 20 (on the side opposite to the torque converter TC). Of the bottom) and is formed in a bottomed container shape having a bottom portion 35b covering 10a and 20a. The M case 35 has an open end 35 a connected and fixed in the axial direction to the TC case 31 by fastening a bolt 33.

  Further, a mounting hole (mounting portion) 36 for mounting the bearing 15 on the drive pulley shaft 10 is formed in the M case 35. The mounting hole 36 is a circular opening provided in the bottom 35 b of the M case 35. The mounting hole 36 is attached with a bearing fixing plate 16 for fixing the bearing 15. That is, in this transmission 1, the bearing 15 that supports the end portion 10 a of the drive pulley shaft 10 is fitted in the mounting hole 36 of the M case 35 so that the drive pulley shaft 10 can rotate with respect to the M case 35. It is supported. And it is comprised so that the axial force which generate | occur | produces in the drive pulley axis | shaft 10 and the bearing 15 may be received with the bearing fixing plate 16 mounted on the bearing 15 fitted in the mounting hole 36 of the M case 35. .

  A pulley fastening structure in the drive pulley shaft 10 will be described with reference to FIG. When the drive pulley 11 is assembled, the movable pulley half 11b and the pulley cover 12 are assembled to the drive pulley shaft 10 on which the fixed pulley half 11a is disposed, and the bearing 15 is assembled to one end of the drive pulley shaft 10. The nut 18 is loosely screwed into the provided male screw. On the other hand, the reverse clutch 7 and the gear 17a of the reverse gear mechanism 17 are assembled on the shaft of the drive pulley shaft 10 opposite to the movable pulley half 11b, and the driven transmission gear 9b of the forward gear mechanism 9 is further provided. These are assembled and fixed at predetermined positions on the drive pulley shaft 10. Then, the jig 50 is set on the driven transmission gear 9b.

  The driven transmission gear 9b is provided with pin engagement holes (concave portions) 51 at a plurality of locations (for example, two locations at intervals of 180 degrees) as a structure for enabling temporary fixing by the jig 50. It is. On the other hand, the jig 50 is provided with pins (projections) 52 of a size that can be fitted into the holes (recesses) 51 of the driven transmission gear 9 b in an arrangement corresponding to the holes (recesses) 51. A hole 53 that allows the drive pulley shaft 10 to enter is provided in the center of the jig 50. In order to set the jig 50 in the driven transmission gear 9b, the drive pulley shaft 10 is passed through the central hole 53 of the jig 50, and each pin (projection) 52 of the jig 50 corresponds to each hole ( Set so as to fit into the (recess) 51.

  As described above, the components are assembled to the drive pulley shaft 10 and the jig 50 is set on the driven transmission gear 9b. Then, the jig 50 is pressed and fixed, and the nut 18 is tightened. Thus, the drive pulley shaft 10 is not easily rotated, and the inner diameter portion of the pulley cover 12 and the inner diameter portion of the bearing 15 are sandwiched between the stepped portion 10b of the drive pulley shaft 10 and the nut 18. The nut 18 can be strongly tightened, and the pulley cover 12, that is, the hydraulic cylinder chamber 14 can be fixed at a predetermined position on the drive pulley shaft 10.

  The concave-convex relationship between the hole (concave portion) 51 of the driven transmission gear 9b and the pin (projection) 52 of the jig 50 may be reversed.

2 input shaft 4 forward clutch 6 endless belt 7 reverse clutch 9 forward gear mechanism 9a drive transmission gear 9b driven transmission gear 10 drive pulley shaft 11 drive pulley 11a fixed pulley half 11b movable pulley half 12 pulley cover 14 hydraulic cylinder Chamber 18 Nut 50 Jig 51 Hole (concave)
52 pins (protrusions)

Claims (3)

The rotation of the engine input to the input shaft is transmitted to the drive pulley shaft through the gear mechanism, and the rotation of the drive pulley shaft is driven through the endless belt that is stretched over the drive pulley disposed on the drive pulley shaft In a continuously variable transmission that transmits to wheels,
The gear mechanism includes a drive transmission gear arranged to be rotatable relative to the input shaft, and a driven transmission gear fixed to the drive pulley shaft, and the drive transmission gear is a clutch arranged on the input shaft. Via the input shaft),
It is configured to fix a hydraulic cylinder chamber of the drive pulley to a predetermined position of the drive pulley shaft by tightening a nut that is screwed to the drive pulley shaft.
The driven transmission gear has a structure for enabling temporary fixing with a jig,
When the nut is tightened, the drive pulley shaft is fixed by temporarily fixing the driven transmission gear via the jig so that the nut can be effectively tightened. Pulley fastening structure.   The pulley fastening structure in the continuously variable transmission according to claim 1, wherein the structure of the driven transmission gear to be temporarily fixed by the jig is a protrusion or a recess in a fitting structure of a protrusion and a recess. . The rotation of the engine input to the input shaft is transmitted to the drive pulley shaft through the gear mechanism, and the rotation of the drive pulley shaft is driven through the endless belt that is stretched over the drive pulley disposed on the drive pulley shaft. A continuously variable transmission that transmits to a wheel,
The gear mechanism includes a drive transmission gear disposed so as to be rotatable relative to the input shaft, and a driven transmission gear fixed to the drive pulley shaft, and the drive transmission gear is a clutch disposed on the input shaft. Is connected to the input shaft via
A structure in which a hydraulic cylinder chamber of the drive pulley is fixed to a predetermined position of the drive pulley shaft by tightening a nut that is screwed onto the drive pulley shaft;
In the continuously variable transmission, the drive pulley shaft is fixed by temporarily fixing the driven transmission gear via a jig when the nut is tightened, thereby enabling effective tightening by the nut. Pulley fastening method.

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