JP2008309254A - Assembling method of toroidal continuously variable transmission and toroidal continuously variable transmission - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an assembling method of a toroidal continuously variable transmission for performing: a press-in process of pressing inner races of bearings in a power transmission member; and an inserting process of inserting outer races of the bearings into shaft holes of a housing, in the different timing. <P>SOLUTION: This assembling method of the toroidal continuously variable transmission is provided for performing the press-in process of pressing the inner races 23 and 26 in the outer periphery of the power transmission member 11, the inserting process of inserting the outer races 23 and 26 into the shaft holes 33 and 34 of a support mechanism 29, and a preload applying process of applying a preload by applying a load in the direction along the axis A1 to the outer races 24 and 27, by preparing the power transmission member 11, preparing the bearings 21 and 22 of interposing rolling elements 25 and 28 between the inner races 23 and 26 and the outer races 24 and 27, and preparing the support mechanism 29 for holding the outer races 24 and 27. The inserting process is performed after performing the press-in process by preparing a load applying member 37 constituted as a separate part from the support mechanism 29 and applying the load to the outer races 24 and 27. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a toroidal-type continuously variable transmission having two sets of continuously variable transmission units in which a power roller is interposed between an input disk and an output disk, and an assembling method thereof.

  Conventionally, a toroidal continuously variable transmission is known as a transmission provided in a transmission path of a torque output from a power source in a vehicle, a transport machine, an industrial machine, and the like. An example of a method for assembling the toroidal type continuously variable transmission is described in Patent Document 1. The toroidal type continuously variable transmission described in Patent Document 1 is a continuously variable transmission having two sets of continuously variable transmission parts in which a power roller is interposed between an input disk and an output disk, that is, a double cavity type toroidal. It is a type continuously variable transmission. This toroidal-type continuously variable transmission is provided with two output disks that rotate integrally with a cylindrical member, and the two output disks are movable in the axial direction with respect to the cylindrical member. Further, an output gear is continuously formed on the outer periphery of the cylindrical member, and two angular bearings are provided between two output disks on the outer periphery of the cylindrical member, specifically on both sides of the output gear. ing.

  The angular bearing has a configuration in which a rolling element is interposed between an inner ring and an outer ring, the inner ring is press-fitted into a cylindrical member, and the outer ring is inserted into a shaft hole in an intermediate wall. Then, when the shaft portion of the bolt-shaped preload applying jig is inserted into the cylindrical member, and the nut is attached to the shaft portion and tightened, the two output disks are brought into the axis line by the nut and the head of the preload applying jig. It is sandwiched in the direction along. Then, the output disk is pressed against the inner ring of the angular bearing, while the load transmitted to the inner ring is transmitted to the outer ring via the rolling elements, and the load transmitted to the outer ring is received by the intermediate wall. In this way, preload is applied to press the rolling elements against the outer ring and the inner ring. The invention relating to the angular bearing is also described in Patent Documents 2 to 4.

Japanese Patent Laid-Open No. 2003-166609 JP 2006-83957 A Japanese Utility Model Publication No. 63-198823 JP 2004-34226 A

  However, in the assembling method of the toroidal type continuously variable transmission described in Patent Document 1, when preloading is applied to the angular bearing, a step of press-fitting the inner ring of the angular bearing into the outer periphery of the cylindrical member, It is necessary to simultaneously perform the process of inserting the outer ring into the shaft hole of the intermediate wall, and there is a possibility that the assembling work becomes complicated.

  The present invention has been made paying attention to the technical problem described above, and the press-fitting process for press-fitting the inner ring of the bearing into the power transmission member is different from the insertion process for inserting the outer ring of the bearing into the shaft hole of the housing. It is an object of the present invention to provide a toroidal-type continuously variable transmission assembly method and a toroidal-type continuously variable transmission that can be performed at a given time.

  In order to achieve the above object, the invention of claim 1 provides a power transmission member to which a disk holding a power roller is attached so as to be integrally rotatable, and a bearing having a rolling element interposed between an inner ring and an outer ring. And a support mechanism for holding the outer ring, a press-fitting step for press-fitting the inner ring into the outer periphery of the power transmission member, an insertion step for inserting the outer ring into the shaft hole of the support mechanism, and an outer ring In a method for assembling a toroidal continuously variable transmission that performs a preload application step of applying a preload that presses the rolling elements against an outer ring and an inner ring by applying a load in a direction along an axis, as a separate component from the support mechanism A load applying member configured to apply a load to the outer ring, and performing the insertion step after performing the press-fitting step; After being started, until the insertion step is completed, and is characterized in that performing the preloading step.

  In the invention of claim 2, in addition to the structure of claim 1, a drive gear is formed on the power transmission member, two bearings are prepared, and the inner rings of the two bearings in the press-fitting step are: While being press-fitted on both sides of the drive gear in the direction along the axis, in the preload application step, the load application member is sandwiched by outer rings of two bearings in the direction along the axis, and the reaction force Then, a preload is applied in such a direction that the outer rings of the two bearings are separated in the direction along the axis.

  In the preload application step, the load application member is sandwiched between the outer rings of the two bearings in the direction along the axis, and the outer rings of the two bearings are moved in the direction along the axis by the reaction force. It is characterized in that a preload in a direction to be separated is given.

  In addition to the configuration of claim 2, the invention of claim 3 provides a support mechanism that is divided into two in the direction along the axis, and each includes a component piece having a shaft hole, and in the insertion step, The outer rings of the two bearings are respectively inserted into the shaft holes of the two component pieces.

  According to a fourth aspect of the present invention, there is provided a power transmission member to which a disk for transmitting power to and from a power roller is attached so as to be integrally rotatable, an inner ring press-fitted into the outer periphery of the power transmission member, and the inner ring and outer ring. And a support mechanism having a shaft hole into which the outer ring is inserted. A load in a direction along the axis is applied to the outer ring, and the rolling element is In the toroidal type continuously variable transmission configured to be applied with a preload to be pressed against the outer ring and the inner ring, the tordal type continuously variable transmission is configured as a separate component from the support mechanism and includes a load applying member that applies a load to the outer ring. It is what.

  According to a fifth aspect of the present invention, in addition to the configuration of the fourth aspect, the disk is an output disk, an input disk is provided which transmits power from a power source and is arranged coaxially with the output disk. The power disk is sandwiched between the input disk and the output disk, and two sets of continuously variable transmission units having the input disk, the output disk, and the power roller are provided. A drive gear is formed on the transmission member, and the bearing is two bearings attached to both sides of the drive gear in a direction along the axis, and the load applying member is sandwiched between outer rings of the two bearings. Attached to the outer ring of the two bearings by the reaction force, and is configured to be provided with a preload in a direction to try to separate the outer rings in a direction along the axis. Is shall.

  According to a sixth aspect of the invention, in addition to the configuration of the fifth aspect, the support mechanism includes two constituent pieces that are divided into two in the direction along the axis and each have a shaft hole. The outer rings of the two bearings are respectively inserted into the shaft holes of the two component pieces.

  According to a seventh aspect of the present invention, in addition to the configuration of the fifth or sixth aspect, the load applying member is formed in an annular shape around the axis, and the load applying member is a driven gear that meshes with the drive gear. Is formed with an opening in which is disposed.

  According to invention of Claim 1 or 4, the press-fit process which press-fits an inner ring | wheel to the outer periphery of the said power transmission member, the insertion process which centers an outer ring | wheel and the shaft hole of a support mechanism, and inserts an outer ring | wheel into a shaft hole And the preload provision process of providing the preload which presses a rolling element to an outer ring and an inner ring by giving the load of the direction along an axis line to an outer ring is performed. In addition, the insertion process is performed after the press-fitting process, and the pre-pressing process is performed from the start of the press-fitting process to the end of the press-fitting process. Therefore, the press-fitting process and the insertion process can be performed at different times or different timings, and the assembling work of the toroidal type continuously variable transmission can be simplified.

  According to the invention of claim 2, the same effect as that of the invention of claim 1 can be obtained. According to the invention of claim 5, the same effect as that of the invention of claim 4 can be obtained. According to the invention, in the press-fitting process, the inner rings of the two bearings are press-fitted on both sides of the drive gear in the direction along the axis. Further, in the preload application step, the load application member is sandwiched between the outer rings of the two bearings in the direction along the axis, and the outer rings of the two bearings are separated in the direction along the axis by the reaction force. The preload of the direction is given.

  According to the invention of claim 3, the same effect as that of the invention of claim 2 can be obtained. According to the invention of claim 6, the same effect as that of the invention of claim 5 can be obtained. According to the invention, in the insertion step, the outer rings of the two bearings are respectively inserted into the shaft holes of the two component pieces.

  According to the seventh aspect of the invention, in addition to obtaining the same effect as that of the fifth or sixth aspect of the invention, the drive gear and the driven gear are meshed, and a part of the driven gear is disposed in the opening. Therefore, the rotation of the driven gear can be prevented from being hindered by the load applying member.

  The toroidal type continuously variable transmission of the present invention can be used for vehicles, industrial machines, machine tools, transport machines, construction machines, and the like. In the present invention, the power of the power source is transmitted to the input shaft of the toroidal-type continuously variable transmission. The power source is a device that generates power to be transmitted to the driven member, and examples of the power source include an engine, an electric motor, a hydraulic motor, and a flywheel. Examples of the driven member include a wheel in a vehicle and a blade in a machine tool. In the present invention, the disk and the power transmission member are disposed so as to be rotatable about the axis. The power transmission member is a mechanism or element that transmits the power of the disk to another rotating element. Examples of the power transmitting member include a rotating shaft, a cylindrical member attached to the rotating shaft, and a sleeve. In the present invention, the lubricating oil changes into a glass state with the lubricating oil interposed between the disk and the power roller, and power is transmitted between the disk and the power roller by traction transmission. Furthermore, the disk in the present invention may be either an input disk disposed upstream of the power roller or an output disk disposed downstream of the power roller in the power transmission direction. The support mechanism is a mechanism that supports the power transmission member via a bearing, and the support mechanism is a mechanism that positions the power transmission member in the radial direction about the axis. Examples of the support mechanism include a frame shape, a frame shape, a truss structure, and a block shape. The bearing in the present invention is an angular bearing that does not have a self-aligning function.

  The power transmission member in this invention is a power transmission member provided so as to be integrally rotatable with the output disk, and a bearing is attached to the power transmission member. The load applying member is configured as a separate component from the support mechanism. That is, in the manufacturing process of the toroidal type continuously variable transmission, it is manufactured and processed in a separate process and with a different material. The manufacturing process may be the same time or a different time. In this invention, the load applying member is a mechanism that is elastically deformed by an external force and generates a preload by its reaction force (elastic restoring force). For example, a metal material can be used as the load applying member. Further, the load applying member may be constituted by a single part or may be constituted by a plurality of parts. Here, when the load applying member is constituted by a plurality of parts, it is possible to use a plurality of parts divided in the direction along the axis. In addition, when the load applying member is composed of a plurality of parts, it is also possible to use a plurality of parts divided in the circumferential direction around the axis. In the present invention, the drive gear is disposed upstream and the driven gear is disposed downstream of the power transmission path from the power source. Each gear may be either a “spur gear” or a “helical gear”. In this invention, a shaft hole is a structure (space) for arrange | positioning the outer ring | wheel of a bearing.

(Specific example 1)
Next, a specific example 1 of the toroidal type continuously variable transmission 1 will be described with reference to FIG. FIG. 2 schematically shows the toroidal-type continuously variable transmission 1 in the assembled state. The toroidal continuously variable transmission 1 is disposed, for example, in a power transmission path from a driving force source (not shown) of a vehicle to wheels (not shown). Here, the driving force source is a device that outputs power transmitted to the wheels, and may be any of a plurality of types of driving force sources having different power generation principles or a single driving force source. Examples of the driving force source that can be used include an internal combustion engine (engine), an electric motor, a motor / generator, a hydraulic motor, and a flywheel system. The toroidal-type continuously variable transmission 1 is disposed inside a casing 2 and has an input shaft 3 that can rotate about an axis A1. The axis A1 is arranged horizontally, and is configured such that the power of the driving force source is transmitted to the input shaft 3 via the driving shaft 4. The drive shaft 4 and the input shaft 3 are arranged coaxially. Two input disks 5 and two output disks 6 are attached to the outer periphery of the input shaft. A toroidal surface 7 is formed on the input disk 5, and a toroidal surface 8 is formed on the output disk 6.

  Further, in the example shown in FIG. 2, two input disks 5 are arranged at a predetermined interval in the direction along the axis A1. Further, two output disks 6 are arranged between the two input disks 5 in the direction along the axis A1. And the toroidal surface 7 and the toroidal surface 8 are provided so as to face each other. The input disk 5 is formed in an annular shape, and the input shaft 3 is inserted into the shaft hole 9 of the input disk 5 and is connected so that the input disk 5 and the input shaft 3 rotate together, for example, by spline connection. Has been. That is, the input shaft 3 and the input disk 5 are configured to be relatively movable in the direction along the axis A1, and in the radial direction centered on the axis A1 (hereinafter abbreviated as “radial direction”). It is relatively positioned. A bearing 10 is provided between the input shaft 3, more specifically, one end of the input shaft 3 in the direction along the axis A <b> 1 and the casing 2, and the input shaft 3 is rotated by the bearing 10. Supported as possible. The bearing 10 has a function of receiving a radial load.

  Further, a sleeve (power transmission member) 11 is disposed between the input disks 5 in the direction along the axis A <b> 1, and the input shaft 3 is disposed in the shaft hole 12 of the sleeve 11. The two output disks 6 are connected so as to rotate integrally with the sleeve 11, for example, splined or serrated. FIG. 1 is a cross-sectional view showing a configuration of a sleeve 11 to which an angular bearing described later is attached, and external teeth 13 are formed at both ends of the sleeve 11 in a direction along the axis A1. The inner teeth (not shown) formed on the inner periphery of the output disk 6 are engaged with the outer teeth 13 so that the output disk 6 is connected to the sleeve 11 so as to rotate together. The output disk 6 is movable relative to the sleeve 11 in the direction along the axis A1. Further, in the direction along the axis A 1, a part of the output disk 6 is out of the arrangement area of the sleeve 11, and the gap between the output disk 6 and the input shaft 3 corresponding to the part out of the arrangement area of the sleeve 11 is. Needle bearing 100 is interposed in the.

  Further, an outward flange 14 is formed continuously on the outer periphery of the sleeve 11, and a gear 15 is formed on the outer periphery of the outward flange 14. Specifically, an outward flange 14 is formed between the external teeth 13 in a direction along the axis A1. Further, press-fitting surfaces 17 and 18 are formed on the outer circumference of the sleeve 11 over the entire circumference. The press-fitting surfaces 17 and 18 are portions into which an inner ring of a bearing to be described later is press-fitted, and the press-fitting surface 17 and the press-fitting surface 18 are arranged at different positions in the direction along the axis A1. Specifically, a press-fitting surface 17 is disposed between the outward flange 14 and one of the external teeth 13 in a direction along the axis A1, and the outward flange 14 and the other external tooth 13 A press-fitting surface 18 is disposed therebetween. A step portion 19 is formed between the press-fitting surface 17 and the outward flange 14 on the outer periphery of the sleeve 11. The step portion 19 is formed over the entire circumference of the sleeve 11. That is, the step portion 19 is an end surface perpendicular to the axis A1. Further, a step portion 20 is formed between the press-fitting surface 18 and the outward flange 14 on the outer periphery of the sleeve 11. The step portion 20 is formed over the entire circumference of the sleeve 11. That is, the stepped portion 20 is an end surface perpendicular to the axis A1.

  Two angular bearings 21 and 22 are provided as bearings for rotatably supporting the sleeve 11. The angular bearings 21 and 22 are arranged at different positions in the direction along the axis A1. Specifically, an angular bearing 21 is attached to the press-fit surface 17, and an angular bearing 22 is attached to the press-fit surface 18. The structure of one angular bearing 21 will be described in detail. An annular inner ring 23, an annular outer ring 24 disposed so as to surround the outer side of the inner ring 23, and the inner ring 23 and the outer ring 24 can roll. And rolling elements 25 arranged at the same position. The configuration of the other angular bearing 22 will be described in detail. An annular inner ring 26, an annular outer ring 27 arranged so as to surround the inner ring 26, and the inner ring 26 and the outer ring 27 can roll. And the rolling elements 28 arranged in the. The rolling elements 25 and 28 may be either balls or rollers. The angular bearings 21 and 22 are configured to have the same outer diameter and inner diameter. The inner ring 23 is press-fitted into the press-fitting surface 17, and the inner ring 26 is press-fitted into the press-fitting surface 18. That is, the inner ring 23 and the press-fitting surface 17 are fixed by “fitting”, and the inner ring 26 and the press-fitting surface 18 are fixed by “fitting”. Further, one end surface of the inner ring 23 is in contact with the step portion 19 of the sleeve 11 in a state where the inner ring 23 is press-fitted into the press-fitting surface 17. Further, the end surface of the inner ring 26 is in contact with the step portion 20 of the sleeve 11 in a state where the inner ring 26 is press-fitted into the press-fitting surface 18.

  On the other hand, the intermediate wall 29 is fixed to the casing 2, specifically, by fastening bolts or the like. The intermediate wall 29 is disposed between the output disks 6 in a direction along the axis A1. The intermediate wall 29 is formed by overlapping two plate-shaped wall pieces 30 and 31 and forming a space 32 therebetween. Further, a shaft hole 33 is formed in the wall piece 30, and the outer ring 24 is disposed in the shaft hole 33. The fitting between the wall piece 30 and the outer ring 24 is a “high-precision clearance fit”. That is, the outer ring 24 is supported by the wall piece 30 and positioned in the radial direction, and the outer ring 24 and the wall piece 30 are configured to be relatively movable in the direction along the axis A1. The wall piece 31 is formed with a shaft hole 34, and the shaft holes 33, 34 have the same inner diameter. Furthermore, the shaft holes 33 and 34 are coaxially arranged. An outer ring 27 is disposed in the shaft hole 34. The fitting between the wall piece 31 and the outer ring 27 is a “high-precision clearance fit”. That is, the outer ring 27 is supported by the wall piece 31 and positioned in the radial direction, and the outer ring 27 and the wall piece 31 are configured to be relatively movable in the direction along the axis A1.

  Further, a cutout portion 35 is formed on the outer periphery of the outer ring 24 over the entire circumference, and a cutout portion 36 is formed on the outer periphery of the outer ring 27 over the entire circumference. The notches 35 and 36 are arranged on the same circumference with the axis A1 as the center. The minimum diameter of the notches 35 and 36 is configured to be larger than the outer diameter of the gear 15. A ring 37 is disposed in the space 32. The ring 37 is a component that applies a load in the direction along the axis A1 to the outer rings 24 and 27, and is formed by integrally forming a metal material in an annular shape. The wall piece 30 is provided with a locking groove 38. As shown in FIG. 6, a rotation stopper 39 is formed on the outer periphery of the ring 37, and the rotation stopper 39 is disposed in the locking groove 38. Thus, in the state where the assembly of the toroidal type continuously variable transmission 1 is completed, the ring 37 and the intermediate wall 29 are prevented from rotating relative to each other. The notches 35 and 36 are mechanisms for holding the ring 37. That is, the ring 37 has a cylindrical portion 40 extending in the direction along the axis A1, and both ends of the cylindrical portion 40 are disposed in the notches 35 and 36 in the direction along the axis A1. . The inner diameter of both ends of the cylindrical portion 40 is configured to be larger than the minimum diameter of the notches 35 and 37 and smaller than the outer diameter of the outer rings 24 and 27.

  In the state where the angular bearing 21 is attached to the press-fitting surface 17 and the angular bearing 22 is attached to the press-fitting surface 18, the contact point B 1 between the outer ring 24 and the rolling element 24, the inner ring 23, and the rolling contact are provided. A contact point B2 with the moving body 25 is formed at a different position in the direction along the axis A1. Further, in the angular bearing 21, the contact point C1 between the outer ring 27 and the rolling element 28 and the contact point C2 between the inner ring 26 and the rolling element 28 are formed at different positions in the direction along the axis A1. The relationship between the line segment (straight line) B3 connecting the contact point B1 and the contact point B2 and the line segment (straight line) C3 connecting the contact point C1 and the contact point C2 will be described. In the plane, the line segments B3 and C3 are not parallel to each other. Specifically, the angle between the line segment B3 and the axis line A1, the line segment C3 and the axis line A1 in such a direction that the distance between the line segment B3 and the line segment C3 becomes shorter as the outer circumferential side of the angular bearings 21, 22 is reached. The angle formed by is determined. That is, the angle formed by the line segment B3 and the axis A1 is not a right angle, and the angle formed by the line segment C3 and the axis A1 is not a right angle. Note that the distance between the line segment B3 and the line segment C3 means the distance in the direction along the axis A1.

  Since the angular bearings 21 and 22 do not have a self-aligning function, the preload is applied as follows. When the angular bearings 21 and 22 are fixed to the sleeve 11 and a load is applied between the outer rings 24 and 27 in the direction along the axis A1, the ring 37 is elastically deformed by the load. The reaction force of the load applied to the ring 37 is generated. Then, a load is generated in a direction along the axis A <b> 1 so that the outer ring 24 and the outer ring 27 are separated from each other. In the angular bearing 21, the rolling elements 25 are pressed against the inner ring 23 and the outer ring 24, and the angular bearing 22 The rolling element 28 is pressed against the inner ring 26 and the outer ring 27. In this way, preload is generated in the angular bearings 21 and 22. Further, when a load is transmitted to the outer rings 24 and 27 due to the reaction force of the ring 37, the load transmitted to the outer ring 24 is transmitted to the inner ring 23 via the rolling elements 25 and is also transmitted to the outer ring 27. When the generated load is transmitted to the inner ring 26 via the rolling elements 28, the inner ring 23 can ensure a frictional force that prevents the inner rings 23, 26 from sliding in the direction along the axis A1 with the sleeve 11. , 36 and the sleeve 11 are fitted.

  On the other hand, the cylindrical portion 40 is provided with an opening 41 in which a part in the circumferential direction is cut out in an arc shape. The opening 41 penetrates the ring 37 in the radial direction. As described above, the ring 37 is configured to be symmetrical with respect to a line segment (not shown) passing through the rotation stopper 39 in FIG. The line segment is orthogonal to the axis A1 in FIG. Further, an output shaft 42 is provided inside the casing 2, and the output shaft 42 is rotatably supported by a bearing 43 attached to the casing 2 and a bearing 44 attached to the intermediate wall 29. . A gear 45 that rotates integrally with the output shaft 42 is provided, and the gear 45 is disposed in the space 32. Regardless of rotation or stop, a part of the gear 45 passes through the opening 41 and reaches the ring 37, and the gears 15 and 45 are engaged with each other. In this way, the input shaft 3 and the output shaft 42 are connected by the gear transmission so that power can be transmitted. The output shaft 42 is connected to wheels (not shown) via a final reduction gear (not shown) so as to be able to transmit power.

  On the other hand, a power roller 46 is disposed between the input disk 5 and the output disk 6. The power roller 46 is configured in a disc shape so as to be rotatable with respect to a center line (not shown) and to be reciprocated linearly along a plane parallel to the axis A1. It is supported by a trunnion (not shown) which is a support mechanism. The trunnion can rotate (tilt) about the rotation center line in the plane. In this way, two sets of continuously variable transmissions (variators) 47 each including one input disk 5, one output disk 6, and power roller 46 are formed. Next, a mechanism for controlling the contact pressure of the power roller 46 against the input disk 5 and the output disk 6 will be described. A stopper 48 is attached between the bearing 10 and one input disk 5 on the outer periphery of the input shaft 3. The stopper 48 is a mechanism for receiving a load in the direction along the axis A1 transmitted to the input disk 5. The stopper 48 is fixed to the input shaft 3 so as not to move in the direction along the axis A1. ing.

  Further, a pressurizing mechanism 49 is provided at the end of the drive shaft 4. The pressurizing mechanism 49 is a mechanism that applies a load in the direction along the axis A1 to the two input disks 5 and the two output disks 6. The pressurizing mechanism 49 generates a load by hydraulic pressure. An actuator that generates a load by an air pressure, an actuator that generates a load by a cam mechanism, or the like can be used. In this embodiment, a load in the direction along the axis A1 is applied from the pressurizing mechanism 49 to the input disk 5 shown on the left side in FIG. The load applied to the input disk 5 is transmitted to the output disk 6 shown on the left side in FIG. 2 via the power roller 46 shown on the left side of FIG. The load transmitted to the output disk 6 is transmitted to the output disk 6 shown on the right side in FIG. The load transmitted to the output disk 6 is transmitted to the input disk 5 shown on the right side in FIG. 2 via the power roller 46 shown on the right side in FIG. The load transmitted to the input disk 5 is transmitted to the bearing 10 via the stopper 48 and the input shaft 3, and the load transmitted to the bearing 10 is received by the casing 2.

  The power transmission principle in the toroidal continuously variable transmission 1 and the control of the gear ratio in the toroidal continuously variable transmission 1 will be described. Traction oil (lubricating oil) is supplied to the toroidal surfaces 7 and 8. Further, the torque of a driving force source such as an engine or an electric motor is transmitted to the input shaft 5 via the driving shaft 4. Further, the pressure mechanism 49 applies a load in the direction along the axis A <b> 1 to the input disk 5 and the output disk 6, thereby increasing the contact pressure of the power roller 46 against the input disk 5 and the output disk 6. Then, the traction oil is pressurized to make a glass transition, and the power of the input disk 5 is transmitted to the output disk 6 via the power roller 46 due to a large shearing force. The torque of the output disk 6 is transmitted to the output shaft 42 via the gears 15 and 45. The torque of the output shaft 42 is transmitted to the wheels. During the transmission of torque as described above, the sleeve 11 is supported by the bearings 21 and 22. Further, when the power roller 46 is linearly moved along a plane parallel to the axis A1, a side slip force is generated at the contact point between the power roller 46 and the toroidal surfaces 7 and 8, and the power roller 46 tilts. To do. In this way, the number of rotations (rotational speed) of each of the disks 5 and 6 according to the radius of the contact point between the power roller 46 and the input disk 5 and the radius of the contact point between the output disk 6 and the power roller 46. Is different, and the ratio of the number of rotations (rotation speed) becomes the gear ratio.

  Next, a method for assembling the toroidal continuously variable transmission 1 shown in FIGS. 1 and 2 will be described with reference to FIGS. First, the sleeve 11 in which the gear 15 is formed is prepared, and the angular bearing 21 is separately prepared. At this time, the angular bearing 21 is not attached to the sleeve 11. Then, the sleeve 11 and the angular bearing 21 are arranged coaxially and are moved relatively close to each other in the direction along the axis A1 to bring the inner ring 23 of the angular bearing 21 into the press-fitting surface of the sleeve 11, as shown in FIG. 17, when the end surface of the inner ring 23 comes into contact with the stepped portion 19, the process of attaching the angular bearing 21 to the sleeve 11 is completed.

  And the outer ring | wheel 24 and the ring 37 of the angular bearing 21 are arrange | positioned coaxially. Next, the ring 37 is brought close to the outer ring 24 in the direction along the axis A1, and the ring 37 is attached to the notch 35 as shown in FIG. Further, an angular bearing 22 is prepared, and the angular bearing 22 and the sleeve 11 are arranged coaxially. Then, the angular bearing 22 is relatively moved in the direction along the axis A <b> 1 so as to approach the sleeve 11, and the inner ring 26 of the angular bearing 22 is press-fitted into the press-fitting surface 18 of the sleeve 11 as shown in FIG. 5. In this manner, the ring 37 is attached to the notch 36 in the process of press-fitting the inner ring 26 into the press-fit surface 18. In addition, the cylindrical portion 40 of the ring 37 is sandwiched between the outer rings 24 and 27 before the end surface of the inner ring 26 comes into contact with the stepped portion 20, and a compressive load in the direction along the axis A1 is applied. Then, when the end surface of the inner ring 26 comes into contact with the stepped portion 20, the process of attaching the angular bearing 22 to the sleeve 11 is completed.

  In this way, in the state where the angular bearings 21 and 22 are both attached to the sleeve 11, a load in the direction along the axis A1 is applied to the ring 37, and the ring 37 is elastically deformed by the load, A pressing force in the direction along the axis A <b> 1 is generated with respect to the outer rings 24, 27 in a direction in which the distance between the outer rings 24, 27 is increased by the reaction force. Based on such a principle, preload is generated in the angular bearings 21 and 22. As described above, the sub-assemblies (intermediate assemblies) in which the angular bearings 21 and 22 are assembled to the sleeve 11 and the ring 37 is attached to the angular bearings 21 and 22 are assembled. Thereafter, wall pieces 30 and 31 are prepared, the wall pieces 30 and 31 are brought close to the direction along the axis A1, and the angular bearing 21 is positioned in the shaft hole 33 as shown in FIG. The angular bearing 22 is positioned inside. Further, the gear 15 and the gear 45 are engaged with each other, and the wall pieces 30 and 31 are fixed with bolts (not shown) or the like. Next, the wall pieces 30 and 31 are fixed to the casing 1, and the assembly process of the toroidal continuously variable transmission 1 is completed.

  As described above, in the toroidal continuously variable transmission 1 and its assembling method shown in FIGS. 1 to 5, the step of press-fitting both the inner rings 23 and 26 into the sleeve 11 is the “press-fitting step”. The process of inserting the outer ring 24 into the shaft hole 33 and inserting the outer ring 27 into the shaft hole 34 is an “insertion process”. In this insertion process, the shaft hole and the outer ring are clearance-fitted with high accuracy. In addition, a preload is applied to the angular bearings 21 and 22 between the start of the press-fitting process of the inner ring 23 and the end of the press-fitting process of the inner ring 26. As described above, the step of applying the preload to the angular bearings 21 and 22 is the “preload applying step”. In this preload application step, the fitting relationship between the outer rings 24 and 27 and the ring 37 is “low-precision clearance fitting”. Thus, the press-fitting process and the insertion process can be performed at different times, and the assembling work of the toroidal type continuously variable transmission 1 can be simplified. Further, when the assembly of the toroidal continuously variable transmission 1 is completed, a part of the gear 45 is disposed in the opening 36. Therefore, it is possible to prevent the rotation of the gear 45 from being hindered. In addition, since the rotation of the ring 37 is prevented by the rotation stopper 39, the contact between the gear 45 and the ring 37 can be reliably prevented.

  The correspondence between the configuration described in the first specific example and the configuration of the present invention will be described. The toroidal continuously variable transmission 1 corresponds to the toroidal continuously variable transmission of the present invention, and the axis A1 is the present invention. The output disk 6 corresponds to the disk and output disk of the present invention, the input disk 5 corresponds to the input disk of the present invention, the power roller 27 corresponds to the power roller of the present invention, The continuously variable transmission 47 corresponds to the continuously variable transmission of the present invention, the sleeve 11 corresponds to the power transmission member of the present invention, the inner rings 23 and 26 correspond to the inner ring of the present invention, and the outer rings 24 and 27 correspond to the inner ring 23 and 26. The rolling elements 25 and 28 correspond to the rolling element of the present invention, the angular bearings 21 and 22 correspond to the bearing of the present invention, and the intermediate wall 29 corresponds to the support mechanism of the present invention. Corresponding ring 3 Corresponds to the load applying member of the present invention, the gear 15 corresponds to the drive gear of the present invention, the gear 45 corresponds to the driven gear of the present invention, and the wall pieces 30, 31 are the component pieces of the present invention. The shaft holes 33 and 34 correspond to shaft holes in the present invention, and the opening 41 corresponds to the opening of the present invention.

(Specific example 2)
Next, another specific example of a load applying member for applying a preload to the angular bearings 21 and 22 will be described with reference to FIG. FIG. 7 is a partial cross-sectional view in a state where the assembly of the toroidal type continuously variable transmission 1 is completed. In the configuration of the specific example 2, the same components as those of the specific example 1 are denoted by the same reference numerals as those of the specific example 1. In the second specific example, the ring 37 includes a cylindrical portion 40 and an inward flange portion 50 formed continuously at one end of the cylindrical portion 40 in the direction along the axis A1. The inward flange portion 50 is disposed inside the wall piece 30, and the inner peripheral end of the inward flange portion 50 is disposed in the notch portion 35 of the outer ring 24. Further, a cutout 51 is formed at the other end of the cylindrical portion 40 in the direction along the axis A1. The notch 51 is formed in an annular shape about the axis A1. Further, the inner diameter of the portion of the cylindrical portion 40 where the notch 51 is formed is configured to be larger than the outer diameter of the gear 15.

  In this way, the notch 51 is disposed outside the notch 36 of the outer ring 27. And the disc spring 52 is attached between the outer ring | wheel 27 and the cylindrical part 40 in the radial direction centering on axis A1. The disc spring 52 is formed in an annular shape around the axis A1. The inner peripheral end of the disc spring 52 is disposed in the notch 36, and the outer peripheral end of the disc spring 52 is disposed in the notch 51. Further, with the inner rings 23 and 26 being press-fitted into the sleeve 11, a compressive load in the direction along the axis A <b> 1 from the inner rings 23 and 26 is applied to the disc spring 52 and the ring 37. The disc spring 52 is configured to be less rigid than the ring 37 with respect to the compressive load in the direction along the axis A <b> 1. For this reason, the force of the direction which spreads the outer rings 24 and 27 in the direction along axis A1 with the elastic force of the disc spring 52 arises. In this way, preload is applied by the angular bearings 21 and 22. In the second specific example, the inner diameters of the shaft holes 33 and 34 are smaller than the outer diameter of the gear 15.

  Next, an assembling method of the toroidal type continuously variable transmission 1 in the specific example 2 will be described with reference to FIGS. 7, 8, and 9. First, the sleeve 11, the angular bearing 21 and the ring are prepared. At this time, the sleeve 11, the angular bearing 21 and the ring 37 are not assembled. Then, as shown in FIG. 8, the inner peripheral end of the inward flange portion 50 of the ring 37 is disposed in the notch portion 35 of the outer ring 24. In this case, the inner peripheral end of the inward flange portion 50 and the outer ring 24 are “gap-fitted”, and the positioning (center alignment) in the radial direction about the axis A1 can be performed with low accuracy. Next, the angular bearing 21 and the ring 37 are brought closer to the sleeve 11 in the direction along the axis A1. Then, the gear 15 is inserted into the ring 37, and then the inner ring 23 is press-fitted into the press-fitting surface 17.

  Then, as shown in FIG. 9, the outer peripheral end of the disc spring 52 is arranged in the notch 51 of the ring 37. Further, the angular bearing 22 is arranged coaxially with the sleeve 11, the angular bearing 22 and the sleeve 11 are brought close to each other, and the inner ring 26 is press-fitted into the press-fitting surface 18. Further, before the end surface of the inner ring 26 contacts the step portion 20, the outer ring 27 contacts the inner peripheral end of the disc spring 52, and the disc spring 52 and the ring 37 are sandwiched between the outer ring 24 and the outer ring 27. . For this reason, a compressive load in the direction along the axis A <b> 1 is applied to the disc spring 53. When the end surface of the inner ring 26 comes into contact with the stepped portion 20, the press-fitting of the inner ring 26 into the sleeve 11 is completed. In this way, the “pressing process” in which the inner rings 23 and 26 are press-fitted together into the sleeve 11 is completed. Also in the specific example 2, preload is applied to the angular bearings 21 and 22 during the press-fitting process. After the press-fitting step as described above, the wall pieces 30 and 31 are coaxially arranged, and the wall pieces 30 and 31 are brought close to each other along the axis A1, and the outer ring 24 is moved as shown in FIG. An “insertion step” is performed in which the shaft is inserted into the shaft hole 33 and the outer ring 27 is inserted into the shaft hole. In this way, the outer ring 24 is clearance-fitted to the wall piece 30 with high accuracy, and the outer ring 27 is clearance-fitted to the wall piece 31 with high accuracy. Furthermore, the wall pieces 30 and 31 are fixed to the casing 2, and the assembly of the toroidal continuously variable transmission 1 is completed.

  Also in the second specific example, since the insertion step is performed after the press-fitting step, the same effect as the first specific example can be obtained. In the second specific example, the same function and effect as the first specific example can be obtained for the same components as in the first specific example. In this specific example 2, the ring 37 and the disc spring 52 correspond to the load applying member in the present invention. That is, in the specific example 2, the load applying member is configured by a plurality of, specifically, two parts. The correspondence relationship between the other configurations in the second specific example and the configuration of the present invention is the same as the corresponding relationship between the configuration of the first specific example and the configuration of the present invention.

(Specific example 3)
A specific example 3 of the configuration in which the preload is applied to the angular bearings 21 and 22 in the toroidal-type continuously variable transmission 2 shown in FIG. 2 will be described with reference to FIG. In the configuration of the specific example 3, the same components as the specific example 1 are configured in the same manner as the specific example 1. In the third specific example, a ring 37 is provided as a load applying member for applying a preload to the angular bearings 21 and 22, and the ring 37 is divided into two pieces 60 and 61 in the direction along the axis A1. have. A rotation stopper 39A is provided on the component piece 60, and a rotation stopper 39B is provided on the component piece 61. Further, the locking groove 38 </ b> A is provided in the wall piece 30, and the locking groove 38 </ b> B is provided in the wall piece 31. The locking grooves 38A and 39B are arranged at the same position on the circumference centered on the axis A1. The rotation stopper 39A is disposed in the locking groove 38A, and the rotation stopper 39B is disposed in the locking groove 38B, thereby preventing the ring 37 from rotating. Further, an inward flange portion 62 is formed on the component piece 60, and an inward flange portion 63 is formed on the component piece 60. The inner peripheral end of the inward flange portion 62 is disposed in the notch portion 35, and the inner peripheral end of the inward flange portion 63 is disposed in the notch portion 36. Furthermore, the opening 41 is formed over both the component pieces 60 and 61. The opening 41 is formed by cutting out the component pieces 60 and 61 and penetrating the ring 37 in the radial direction. Thus, the component pieces 60 and 61 are configured symmetrically in FIG. 10, and the component pieces 60 and 61 are in contact with each other and arranged coaxially between the outer ring 24 and the outer ring 27. Is arranged. Specifically, with the inner rings 23 and 26 being press-fitted into the sleeve 11, a compressive load in the direction along the axis A1 is applied from the outer rings 24 and 27 to the ring 37, and the ring 37 is elastically deformed by the compressive load. As in the first specific example, the preload is applied to the angular bearings 21 and 22.

  Next, an assembly process of the toroidal type continuously variable transmission 1 in the specific example 3 will be described. First, the sleeve 11, the angular bearings 21 and 22, and the component pieces 60 and 61 are prepared. Then, the inner peripheral end of the inward flange portion 62 of the component piece 60 is disposed in the notch portion 35 of the outer ring 24, and the inner peripheral end of the inward flange portion 63 of the component piece 61 is disposed in the notch portion 36 of the outer ring 27. Deploy. Here, the outer ring 24 and the component piece 60 are clearance-fitted with low accuracy, and the outer ring 27 and the component piece 61 are clearance-fitted with low accuracy. Then, the inner ring 23 of the angular bearing 21 that holds the component piece 60 is press-fitted into the press-fit surface 17, and the inner ring 26 of the angular bearing 22 that holds the component piece 61 is press-fitted into the press-fit surface 18. Thus, in the process of press-fitting the inner rings 23 and 26 into the sleeve 11, the component piece 60 and the component piece 61 come into contact with each other. A load is applied to compress in the direction along the axis A1. In this way, the ring 37 is elastically deformed, and the reaction force generates a load in a direction that pushes the outer rings 24 and 27 in the direction along the axis A1.

  Further, as shown in FIG. 11, when the end surface of the inner ring 23 comes into contact with the stepped portion 19 and the end surface of the inner ring 26 comes into contact with the stepped portion 20, a “press-in process” for press-fitting the inner rings 23 and 26 into the sleeve 11 is performed. finish. By such an action, also in the specific example 3, the preload is applied to the angular bearings 21 and 22 in the press-fitting process. Next, the wall pieces 30 and 31 are arranged coaxially and brought close to each other, and the outer ring 24 is inserted into the shaft hole 33 and the outer ring 27 is inserted into the shaft hole 34 as shown in FIG. Thus, the process of inserting the outer ring 24 into the shaft hole 33 and inserting the outer ring 27 into the shaft hole 34 is an “insertion process”. Also in the third specific example, the relationship between the outer ring 24 and the wall piece 30 and the relationship between the outer ring 27 and the wall piece 31 are “high-precision clearance fit”. Then, when the wall piece 30 and the wall piece 31 come into contact with each other, the “insertion step” is completed, and the intermediate wall 29 is fixed to the casing 2. Thus, also in the specific example 3, since the “insertion step” is performed after the “press-fitting step” is completed, the same effect as the specific example 1 can be obtained. Further, in the specific example 3, the same effects as those in the specific example 1 can be obtained for the same components as in the specific example 1. In the third specific example, the ring 37 corresponds to the load applying member of the present invention. And the ring 37 has the structural pieces 60 and 61 divided | segmented into two in the direction along axis A1.

  In each specific example, the end (completion) of the assembly process of the toroidal type continuously variable transmission 1 means that the angular bearings 21 and 22 are attached to the sleeve 11 and the preload is applied to the angular bearings 21 and 22. 2 and the meaning of ending the process of inserting the outer ring 24 into the shaft hole 33, inserting the outer ring 27 into the shaft hole 34, and fixing the intermediate wall 29 to the casing 2, is shown in FIG. This includes both the meaning of completing the assembly of all parts. In each specific example, “high-precision clearance fit” and “low-precision clearance fit” are not terms that mean specific clearance amounts, but “high accuracy” compared to “low accuracy”. In the case of (2), it means the relative relationship (large / small) of the gap amount that the “radial gap amount” centered on the axis A1 is small. In each specific example, the assembling work of the toroidal-type continuously variable transmission 1 can be executed in either a state where the axis A1 is substantially vertical or a state where it is substantially horizontal. In each specific example, as the sleeve, alloy steel for bearing machine structure, carbon steel for machine structure, or the like can be used. A rolled steel plate can be used as the metal material used for the ring. Furthermore, examples of the metal material used for the bearing include white metal, aluminum alloy, and baby metal.

It is sectional drawing which shows the principal part of the specific example 1 of the toroidal type continuously variable transmission of this invention. 1 is a cross-sectional view in a direction along an axis showing an example of a toroidal continuously variable transmission according to the present invention. It is sectional drawing which shows the assembly process of the toroidal type continuously variable transmission shown by FIG. It is sectional drawing which shows the assembly process of the toroidal type continuously variable transmission shown by FIG. It is sectional drawing which shows the assembly process of the toroidal type continuously variable transmission shown by FIG. It is a perspective view of the ring used for the toroidal type continuously variable transmission shown by FIG. It is sectional drawing which shows the principal part of the specific example 2 of the toroidal type continuously variable transmission of this invention. It is sectional drawing which shows the assembly process of the toroidal type continuously variable transmission shown by FIG. It is sectional drawing which shows the assembly process of the toroidal type continuously variable transmission shown by FIG. It is sectional drawing which shows the principal part of the specific example 3 of the toroidal type continuously variable transmission of this invention. It is sectional drawing which shows the assembly process of the toroidal type continuously variable transmission shown by FIG.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Toroidal type continuously variable transmission, 3 ... Input shaft, 5 ... Input disk, 6 ... Output disk, 11 ... Sleeve, 15, 45 ... Gear, 21, 22 ... Angular bearing, 23, 26 ... Inner ring, 24, 27 ... outer ring, 25, 28 ... rolling element, 29 ... intermediate wall, 37 ... ring, 30, 31 ... wall piece, 33, 34 ... shaft hole, 41 ... opening, 52 ... disc spring, 60, 61 ... component piece, A1 axis.

Claims (7)

A power transmission member to which a disk that transmits power to and from a power roller is attached so as to be integrally rotatable is prepared, a bearing having a rolling element interposed between an inner ring and an outer ring is prepared, and a support mechanism that holds the outer ring is provided. As well as
A press-fitting step of press-fitting the inner ring into the outer periphery of the power transmission member;
An insertion step of inserting the outer ring into the shaft hole of the support mechanism;
In the assembling method of the toroidal type continuously variable transmission that performs a preload applying step of applying a preload that presses the rolling elements against the outer ring and the inner ring by applying a load in a direction along the axis to the outer ring.
The support mechanism is configured as a separate part, and a load applying member that applies a load to the outer ring is prepared.After the press-fitting process, the insertion process is performed, and the press-fitting process is started, A method for assembling the toroidal continuously variable transmission, wherein the preload application step is performed until the insertion step is completed. A drive gear is formed on the power transmission member, and two bearings are prepared.
In the press-fitting step, the inner rings of the two bearings are press-fitted on both sides of the drive gear in a direction along the axis,
In the preload application step, the load application member is sandwiched between the outer rings of the two bearings in the direction along the axis, and the outer rings of the two bearings are moved in the direction along the axis by the reaction force. 2. A method for assembling a toroidal continuously variable transmission according to claim 1, wherein a preload in a direction to be separated is applied. While preparing a support mechanism that is divided into two in the direction along the axis, and each includes a component piece having an axial hole,
3. The method of assembling a toroidal continuously variable transmission according to claim 2, wherein in the inserting step, outer rings of the two bearings are respectively inserted into shaft holes of the two component pieces. A power transmission member on which a disk that transmits power to and from a power roller is attached so as to be integrally rotatable, an inner ring that is press-fitted into the outer periphery of the power transmission member, and a rolling element between the inner ring and the outer ring And a support mechanism having a shaft hole into which the outer ring is inserted,
In the toroidal continuously variable transmission having a configuration in which a load in a direction along the axis is applied to the outer ring, and a preload for pressing the rolling elements against the outer ring and the inner ring is applied.
A toroidal-type continuously variable transmission configured as a separate component from the support mechanism and provided with a load applying member that applies a load to the outer ring. The disk is an output disk, and an input disk is provided that transmits power from a power source and is arranged coaxially with the output disk. A power roller is sandwiched between the input disk and the output disk. 2 sets of continuously variable transmission units having these input disk, output disk, and power roller are provided,
A drive gear is formed on the power transmission member, and the bearings are two bearings attached to both sides of the drive gear in a direction along the axis.
The load application member is sandwiched between the outer rings of the two bearings, and the reaction force causes a preload in a direction to try to separate the outer rings of the two bearings in the direction along the axis. The toroidal continuously variable transmission according to claim 4, wherein the toroidal continuously variable transmission is configured.   The support mechanism is divided into two in the direction along the axis, and includes two component pieces each having an axial hole, and the outer ring of the two bearings is formed of the two component pieces. 6. The toroidal continuously variable transmission according to claim 5, wherein the toroidal continuously variable transmission is inserted into each of the shaft holes.   The load applying member is formed in an annular shape around the axis, and the load applying member is formed with an opening in which a driven gear meshing with the drive gear is disposed. 5. A toroidal continuously variable transmission according to 5 or 6.

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