JP5768710B2 - Dry belt type continuously variable transmission - Google Patents

Description

  The present invention relates to a belt-type continuously variable transmission including at least a pair of pulleys and a belt wound around the pulleys, and more particularly to a dry-type belt-type continuously variable transmission.

  The belt-type continuously variable transmission is a winding transmission mechanism in which a gear ratio is set according to a belt winding radius with respect to a driving pulley and a driven pulley, and the winding radius for each pulley is continuously set. By changing the speed ratio, the gear ratio can be changed continuously or steplessly. Recently, it is frequently used as a vehicle transmission. An example of this is described in Patent Document 1. In the belt-type continuously variable transmission described in Patent Document 1, one end of a rotating shaft with which a fixed sheave is integrated is connected to a transaxle rear cover via a bearing. A movable sheave that approaches and separates from the fixed sheave is attached to the rotating shaft so as to rotate integrally with the rotating shaft. The surfaces of these sheaves facing each other are formed in a taper shape to form a so-called belt groove around which the belt is wound. Further, a hydraulic chamber is formed on the back side of the movable sheave, and the movable sheave is appropriately moved to the fixed sheave side by supplying or discharging hydraulic pressure through an oil passage formed inside the rotating shaft. It is comprised so that it may press. The hydraulic chamber has a drum-like member provided along the inner ring of the bearing at the end of the rotary shaft, and is fitted in a liquid-tight manner on the outer peripheral side of the drum-like member and integrated with the movable sheave. Formed by the cylindrical portion. The outer ring of the bearing is fixed to the transaxle rear cover by a stopper plate fixed to the inner surface of the transaxle rear cover by a bolt.

JP 2009-275826 A

  The belt type continuously variable transmission described in Patent Document 1 is a so-called wet type lubricating oil supplied to a bearing or a lubricating oil equivalent to the lubricating oil supplied between the belt and the pulley. This is to suppress wear of the belt and pulley and to cool them, but since an oil film is interposed between the belt and the pulley, the friction coefficient between them must be reduced. On the other hand, a dry belt type continuously variable transmission is conventionally known. In this type of continuously variable transmission, a belt and a pulley are in direct contact with each other, or a fluid different from lubricating oil is interposed between the two. And configured to transmit torque. Even in this type of belt-type continuously variable transmission, the shaft to which the pulley is attached is rotatably supported by a bearing, and a gear may be used to transfer torque to and from the rotating shaft. There are usually many places that need to be used. Since such lubrication is not performed between the belt and the pulley in the dry belt type continuously variable transmission, in the configuration described in Patent Document 1, the bearing of the rotating shaft to which the pulley is attached is provided. The lubricating oil adheres to the belt and pulley, and the original function as a dry belt type continuously variable transmission may not be exhibited.

  In various transmission mechanisms such as a transmission, an oil seal or a seal ring is usually used to isolate the lubricated portion from the non-lubricated portion. However, since these sealing materials are provided on the movable part and slide, they cause a friction loss depending on the size and shape thereof. Further, the assembling order is restricted according to the position where the sealing material is attached, and accordingly, the size and shape are restricted. A structure that isolates the bearing and pulley of the rotary shaft in a sealed state in the dry belt type continuously variable transmission described above, while reducing friction loss and improving assemblability, has not been known so far. There was room for.

  The present invention has been made paying attention to the technical problem described above, supplying lubricating oil to the bearing supporting the rotating shaft, and preventing or suppressing leakage of the lubricating oil to the belt and pulley, At the same time, an object of the present invention is to provide a dry belt type continuously variable transmission capable of reducing friction loss accompanying prevention of leakage of lubricating oil.

In order to achieve the above object, according to the first aspect of the present invention, a belt for transmitting torque is wound around a pulley without passing through the lubricating oil, and the rotating shaft provided with the pulley is lubricated by the lubricating oil. In the dry belt type continuously variable transmission supported by the housing via the rolling bearing, an inner diameter smaller than the outer diameter of the rolling bearing is provided between the rolling bearing and the pulley on the outer peripheral surface of the rotating shaft. with the seal ring is fitted, the seal ring was fitted and the circumferential surface engaged, the hollow support portion of smaller inner diameter than the outer diameter of the rolling bearings, provided we are to be integrated with said housing, said rolling The bearing has an inner ring fitted to the rotating shaft, and an outer ring that rotates relative to the inner ring with a rolling element interposed between the outer ring and the inner ring. Above A stopper is provided for pressing and fixing the wheel against the housing in the axial direction, the hollow support portion is formed integrally with the stopper, and the lubricating oil between the rolling bearing and the seal ring is supplied to the belt and A discharge hole that discharges to a place that does not adhere to the pulley is formed so as to penetrate the outer ring in the axial direction thereof, and a seal is provided between the stopper and the housing on both sides of the outer ring on the outer peripheral side of the discharge hole. and it is characterized in the this the sealant for sealing is provided.

According to the invention of claim 2, a belt for transmitting torque is wound around the pulley without passing through the lubricating oil, and the rotating shaft provided with the pulley is housed via a rolling bearing lubricated by the lubricating oil. In the dry belt type continuously variable transmission supported on the outer periphery of the rotary shaft, a seal ring having an inner diameter smaller than the outer diameter of the rolling bearing is fitted between the rolling bearing and the pulley. together, thereof the seal ring was fitted and the circumferential surface engaged, the hollow support portion of smaller inner diameter than the outer diameter of said rolling bearing is provided by integral with the housing, before Symbol rolling bearing, said rotary shaft the rolling element is interposed has an outer ring rotates relative to the inner ring, before Symbol hollow support portion, the front of formed integrally with Kigairin between the mated inner ring, an outer peripheral surface of the inner ring The rolling A discharge hole for discharging the lubricating oil between the receiver and the seal ring to a place where it does not adhere to the belt and the pulley is formed so as to penetrate the outer ring in the axial direction, and the outer ring which is a dry belt-type continuously variable transmission which is characterized that you sealant for sealing a sealed state between the housing on the side surface of the housing side.

According to a third aspect of the present invention , there is provided a housing through a rolling bearing in which a belt for transmitting torque is wound around a pulley without using lubricating oil, and a rotary shaft provided with the pulley is lubricated by the lubricating oil. In the dry belt type continuously variable transmission supported on the outer periphery of the rotary shaft, a seal ring having an inner diameter smaller than the outer diameter of the rolling bearing is fitted between the rolling bearing and the pulley. together, the seal ring was fitted and the circumferential surface engaged, the hollow support portion of smaller inner diameter than the outer diameter of said rolling bearing is provided by integral with the housing, a front Symbol rolling bearing and the seal ring exhaust Detchi for discharging the lubricating oil between the portion which does not adhere to the belt and the pulley is further provided, wherein the discharge passage is formed through the rolling bearing in the axial direction An outlet groove, an annular groove formed on the same axis as the rolling bearing at a position where the rolling bearing is in close contact with the housing, and the discharge port is open; which is a dry belt-type continuously variable transmission, characterized in it to contain the oil discharge passage which communicates with the portion which is not attached to the pulley.

  According to this invention, the seal ring is disposed between the rolling bearing to which the lubricating oil is supplied and the pulley, and the rolling bearing is isolated from the pulley in a sealed state, so that the lubricating oil leaks to the pulley side. Therefore, the friction coefficient between the belt and the pulley can be prevented from decreasing. In other words, dry torque transmission can be established and maintained. Although the inner diameter of the seal ring is smaller than the outer diameter of the rolling bearing, it can be easily assembled by fitting the rotating shaft before the rolling bearing, and the rotating shaft can be assembled to the housing in that state. As a result, there is no hindrance to the assembly, and the misalignment amount of the rotating shaft and the belt can be set as expected. Furthermore, since the inner diameter of the seal ring is smaller than the outer diameter of the rolling bearing, the relative peripheral speed associated with the rotation of the rotating shaft is reduced, and power loss due to frictional sliding of the seal ring can be reduced. . In addition, since the diameter of the seal ring is small, the diameter of the portion where the seal ring is mounted or fitted is also small, so that the processing area of the portion is small and the productivity or the manufacturing cost can be improved.

Further, a stopper for fixing by pressing in the axial direction is provided to the outer ring of the rolling rising bearing relative to the housing, the hollow support portion is formed integrally with the stopper. Therefore, the stopper can adjust the amount of misalignment in the rotational direction of the belt by positioning the rolling bearing and the housing, and can further improve the torque transmission efficiency. Further, the stopper can function not only as a means for fixing the rolling bearing but also as a sealing means for preventing leakage of the lubricating oil.

In the invention of claim 1 Ah Rui 2 In addition to this, the lubricating oil supplied to the rolling bearing, it is possible to discharge the portion that does not adhere to the pulley and belt, or staying lubricant to the rolling bearing for a long period of time As a result, it is possible to prevent or suppress a situation such as deterioration of the lubricating oil.

Furthermore, according to the invention of claim 2, a function for preventing leakage of lubricating oil can be imparted to the outer ring of the rolling bearing.

On the other hand, according to the invention of claim 3, the lubricating oil supplied to the rolling bearing is discharged from the discharge passage even if it flows between the rolling bearing and the seal ring, so that the lubricating oil is circulated. As a result, it is possible to prevent or suppress a situation in which the lubricating oil stays in the rolling bearing for a long period of time or the lubricating oil deteriorates accordingly.

It is sectional drawing which shows the Example of the dry-type belt-type continuously variable transmission which concerns on this invention. It is the schematic for demonstrating the power transmission path | route when the dry type belt-type continuously variable transmission which concerns on this invention is mounted in a vehicle. It is sectional drawing which shows the other Example of the dry belt type continuously variable transmission which concerns on this invention.

  Next, an embodiment of the dry belt type continuously variable transmission according to the present invention will be described. First, the configuration will be described. FIG. 2 shows a power transmission path when the dry belt type continuously variable transmission according to the present invention is mounted on a vehicle. The dry belt type continuously variable transmission 1 includes a power source 2 such as an engine or an electric motor. Power is transmitted, and the transmitted torque and rotation speed are changed and output to the wheels 5 via the counter gear unit 3 and the differential gear 4. The configuration of this dry belt type continuously variable transmission 1 is the same as that conventionally known. The primary pulley 6 is rotated by transmission of power from the power source 2, and the primary pulley 6 is arranged in parallel with the primary pulley 6. A secondary pulley 7 that rotates when power is transmitted from the pulley 6 and a belt 8 that is wound around the pulleys 6 and 7 and transmits power are configured.

  Since the primary pulley 6 and the secondary pulley 7 have substantially the same configuration, only a partial cross section of the secondary pulley 7 is shown as shown in FIG. The secondary pulley 7 is a fixed sheave 10 formed integrally with an output shaft 9 (rotating shaft) connected to the counter gear unit 3, and is disposed to face the fixed sheave 10 and moves in the axial direction of the output shaft 9. It is comprised by the fixed sheave 11 arrange | positioned possible. Further, the belt / pulley chamber 12a in which the belt 8 in the housing 12 and the pulleys 6 and 7 are provided is configured so that lubricating oil does not leak.

  The belt 8 for transmitting power is non-metallic by attaching a small piece of metal to the non-metallic belt (sometimes referred to as a dry belt) mainly composed of rubber or resin, for example. Any of non-metallic composite belts (sometimes referred to as dry composite belts) having a transmission torque capacity larger than that of metal belts may be used. The belt 8 is configured to be in direct contact with the pulley or to transmit torque by interposing a fluid different from the lubricating oil therebetween.

  Further, the fixed sheave 10 and the fixed sheave 11 constituting the pulley 7 around which the belt 8 is wound have mutually confronting surfaces (hereinafter referred to as pulley surfaces 10a and 11a) formed in a conical shape (tapered shape). The belt 8 described above is wound around the belt winding groove formed between the opposed pulley surfaces 10a and 11a, and the pulley surfaces 10a and 11a and the side surfaces of the belt 8 interpose lubricating oil. It is comprised so that power may be transmitted by making frictional contact.

  The inner peripheral portion of the fixed sheave 10 is formed in a hollow shape so that the fixed sheave 10 can move in the axial direction of the output shaft 9, and the output shaft 9 is inserted into the hollow portion. . Further, a bush 13 is provided on the inner peripheral portion of the movable sheave so that the fixed sheave 10 can easily move in the axial direction of the output shaft 9. A hydraulic chamber (not shown) that presses the fixed sheave 10 toward the fixed sheave 10 formed integrally with the output shaft is provided on the opposite side of the fixed sheave 10 with the fixed sheave 10 interposed therebetween. The hydraulic chamber is configured by, for example, a hydraulic actuator (not shown) to move the fixed sheave 10 in the axial direction of the fixed sheave 10, and is configured to press the fixed sheave 10 toward the fixed sheave 10 side. .

  The output shaft 9 in which the fixed sheave 10 is integrally formed has an inner peripheral portion formed in a hollow shape 14. The hollow portion 14 is fitted into a hollow projecting portion 15 projecting from the inner surface of the housing 12 in the axial direction of the output shaft 9, and communicates with a control oil supply / discharge oil passage 16 formed in the projecting portion 15. The control oil is supplied and discharged. Further, the output shaft 9 has a boss portion 17 into which a seal ring (to be described later) is fitted and a rolling bearing 18 smaller than the diameter of the boss portion 17 at the end opposite to the fixed sheave 10 across the fixed sheave 10. A bearing fitting portion 19 to be fitted is formed. An end portion of the output shaft 9 is rotatably held by a rolling bearing 18.

  The rolling bearing 18 is fitted to the end portion of the output shaft 9 and the housing 12, and holds the output shaft 9 rotatably. Specifically, the rolling bearing 18 has a rolling element 18b interposed between the inner ring 18a fitted to the bearing fitting portion 19 of the output shaft 9 and the outer peripheral surface of the inner ring 18a, and the inner ring 18a. And an outer ring 18c that relatively rotates. The inner ring 18 a of the rolling bearing 18 is fixed by being pressed against the wall surface 17 a of the boss portion 17 of the output shaft 9 by a lock nut 20 in the axial direction. Further, the outer ring 18c of the rolling bearing 18 is fixed to the rear cover 12 by being pressed in the axial direction by a stopper plate 24 described later. Note that the rolling bearing may be provided not only on the output shaft of the secondary pulley but also on the input shaft of the primary pulley.

  The housing 12 is provided with a lubricating oil supply oil passage 21 that supplies lubricating oil to the rolling bearing 18. The lubricating oil supply oil passage 21 is formed on the inner surface of the rear cover 12 where the end of the output shaft 9 is fitted. The lubricating oil supplied from the lubricating oil supply oil passage 21 is a space between the inner surface of the rear cover 12 in which the end of the output shaft 9 is fitted, the outer peripheral surface of the end of the output shaft 9, and the lock nut 20. Is supplied to the rolling bearing 18.

  Further, a seal ring 22 having an inner diameter smaller than the outer diameter of the rolling bearing 18 is fitted between the rolling bearing 18 and the pulley 7 in the outer peripheral surface of the output shaft 9, and the seal ring 22 is formed on the inner peripheral surface. A hollow support portion 23 having an inner diameter smaller than the outer diameter of the rolling bearing 18 is provided so as to be integrated with the housing 12.

  Specifically, the hollow support portion 23 is integrally formed with a stopper plate 24 that positions the rolling bearing 18 and the housing 12. The stopper plate 24 is configured such that the inner diameter of the hollow support portion 23 is smaller than the outer diameter of the rolling bearing 18, and the inner periphery of the stopper plate 24 is fitted to the outer ring 18 c of the rolling bearing 18. The stopper plate 24 positions the pulley 7 by pressing the rolling bearing 18 against the housing side of the output shaft 9 in the axial direction. The shape of the stopper plate 24 is, for example, a substantially triangular shape, and each corner is fixed with a bolt 25. The hollow support portion 23 formed on the stopper plate 24 keeps the rolling bearing 18 in a lubricated state together with the seal ring 22 and prevents the lubricating oil from leaking to the pulley 7 and the belt 8. That is, the hollow support portion 23 and the seal ring 22 maintain a liquid-tight state in which the lubricating oil is sealed so that the lubricating oil that is a liquid does not leak into the pulley 7, the belt 8, or the like. The stopper plate may have any shape as long as it can position the pulley by pressing the rolling bearing, for example, a substantially hexagonal shape.

  Further, on the inner peripheral side of the hollow support portion 23 formed on the stopper plate 24, there is a space between the rolling bearing 18 and the fixed sheave 10 in the outer peripheral surface of the boss portion 17 of the output shaft 9 in the axial direction of the output shaft 9. In addition, a seal ring 22 having an inner diameter smaller than the outer diameter of the rolling bearing 18 is press-fitted. The seal ring 22 prevents the lubricating oil from leaking into the belt / pulley chamber 12a in which the belt 8 and the pulley 7 are provided, and keeps the rolling bearing 18 in a lubricated state.

  Further, a discharge path for discharging the lubricating oil from between the rolling bearing 18 and the seal ring 22 is provided. Specifically, the outer ring 18c of the rolling bearing 18 is provided with at least one discharge hole 26 penetrating in the axial direction. The discharge hole 26 communicates with the space between the rolling bearing 18 and the seal ring 22, and discharges the lubricating oil accumulated in the space to a place where the lubricant does not adhere to the belt 8 and the pulley 7. An annular groove 27 centering on the axis of the rolling bearing 18 is provided on the inner surface of the rear cover 12 with which the side surface of the outer ring 18c of the rolling bearing 18 is in contact, and the rear cover with which the side surface of the rolling bearing 18 is in contact. 12 is communicated with the above-described discharge hole 26. The rear cover 12 is provided with a lubricating oil discharge oil passage 28 for discharging the lubricating oil. Since the lubricating oil discharge oil passage 28 communicates with the annular groove 27, the lubricating oil accumulated in the space between the rolling bearing 18 and the seal ring 22 can be discharged to a place where the lubricating oil does not adhere to the belt 8 and the pulley 7. it can.

  In addition, seal members 29a and 30a that are sandwiched in the axial direction and seal the rolling bearing 18 in a sealed state are provided at a portion where the rolling bearing 18, the housing 12, and the stopper plate 24 are fitted. Specifically, annular grooves 29 and 30 are formed on both side surfaces of the outer ring 18c of the rolling bearing 18, and O-rings (seal members) 29a and 30a are provided in the annular grooves 29 and 30, respectively. These O-rings 29 a and 30 a are in contact with the contact surface between the housing 12 and the outer ring 18 c of the rolling bearing 18 in the axial direction of the output shaft 9, and between the outer ring 18 c of the rolling bearing 18 and the stopper plate 24 in the axial direction of the output shaft 9. The lubricating oil can be prevented from leaking to the pulleys 6 and 7 and the belt 8 from the contact surface. In other words, the O-rings 29a and 30a maintain a liquid-tight state that seals the lubricating oil so that the lubricating oil that is liquid does not leak to the pulley 7, the belt 8, or the like.

  Next, an example of an assembly process of the dry belt type continuously variable transmission according to the present invention will be described. First, the seal ring 22 is press-fitted into the inner peripheral side of the hollow support portion 23 formed on the stopper plate 24. The inner diameter of the seal ring 22 is smaller than the outer diameter of the rolling bearing 18. Next, the stopper plate 24 in which the seal ring 22 is press-fitted into the inner peripheral portion is inserted in the axial direction of the boss portion 17 of the output shaft 9 integrally provided with the fixed sheave 10. In other words, the seal ring 22 press-fitted into the hollow support portion 23 of the stopper plate 24 is inserted in the axial direction of the boss portion 17 of the output shaft 9. After the stopper plate 24 is inserted into the boss portion 17 of the output shaft 9 together with the seal ring 22, the inner ring 18a of the rolling bearing 18 is press-fitted in the axial direction of the bearing fitting portion 19 of the output shaft 9, and the output shaft 9 is pressed against the wall surface 17a of the boss portion 17 by the lock nut 20 in the axial direction. Then, the end of the output shaft 9 to which the lock nut 20 is tightened is attached to the rear cover side. Specifically, the protrusion 15 of the rear cover is fitted into the hollow portion 17 at the end of the output shaft 9, and the outer ring 18 c of the rolling bearing 18 is fitted to the rear cover 12. Finally, the stopper plate 24 disposed between the rolling bearing 18 and the fixed sheave 10 in the direction of the output shaft 9 of the output shaft 9 is tightened to the housing side in the axial direction of the output shaft 9 with a bolt 25 to perform rolling. The outer ring 18 c of the bearing 18 is pressed against the stopper plate 24 and the hollow support portion 23 against the housing side of the output shaft 9.

  Next, the operation of the dry continuously variable transmission according to the present invention will be described. The hollow support portion according to the present invention is formed on the stopper plate 24, and the inner diameter thereof is smaller than the outer diameter of the rolling bearing 18. The hollow support portion 23 is provided with a seal ring 22 having an outer diameter smaller than the outer diameter of the rolling bearing 18 on the inner diameter, and the rolling bearing 18 is kept in a lubricated state together with the seal ring 22. The lubricating oil supplied from the lubricating oil supply oil passage 21 is supplied to the rolling bearing 18 through a space between the inner surface of the rear cover 12, the outer peripheral surface of the end of the output shaft 9, and the lock nut 20. The lubricating oil supplied to the rolling bearing 18 part lubricates the rolling bearing 18, and the outer peripheral surface of the boss part 17 of the output shaft 9 in the axial direction of the output shaft 9 from between the outer ring 18 c and the inner ring 18 a of the rolling bearing 18. Of these, it enters between the rolling bearing 18 and the fixed sheave 10. Between the rolling bearing 18 and the fixed sheave 10 on the outer peripheral surface of the boss portion 17 of the output shaft 9 in the axial direction of the output shaft 9, there are a hollow support portion 23 formed on the stopper plate 24 and a hollow support portion 23. A space is formed between the seal ring 22 press-fitted into the inner diameter and the outer peripheral surface of the boss portion 17 of the output shaft 9. This space is held in a sealed state by a hollow support portion 23 formed in the stopper plate 24 and a seal ring 22 press-fitted into the inner diameter of the hollow support portion 23. That is, since the seal ring 22 is disposed between the rolling bearing 18 to which the lubricating oil is supplied and the pulley 7 and the rolling bearing 18 is isolated from the pulley 7 in a sealed state, the lubricating oil leaks to the pulley side. Therefore, the friction coefficient between the belt and the pulley can be prevented from decreasing. In other words, dry torque transmission can be established and maintained.

  Further, since the inner diameter of the seal ring 22 is smaller than the outer diameter of the rolling bearing 18, the relative peripheral speed associated with the rotation of the rotating shaft is reduced, and power loss due to frictional sliding of the seal ring is reduced. Can do.

  In addition, since the diameter of the seal ring 22 is reduced by reducing the diameter of the seal ring 22, the diameter of the portion where the seal ring 22 is mounted or fitted is also reduced. .

  Further, the seal ring 22 has an inner diameter smaller than the outer diameter of the rolling bearing 18, but can be easily assembled by fitting the rotating shaft before the rolling bearing, and in this state, the rotating shaft is assembled to the housing. Therefore, there is no problem in assembling, and the amount of misalignment of the rotating shaft and the belt can be set as expected.

  In addition, the stopper plate 24 can adjust the amount of misalignment in the rotational direction of the belt by positioning the rolling bearing 18 and the housing 12, and can further improve the torque transmission efficiency. Further, the stopper plate can function not only as a means for fixing the rolling bearing but also as a sealing means for preventing leakage of the lubricating oil.

  Further, the lubricating oil that has entered the space between the hollow support portion 23 formed on the stopper plate 24, the seal ring 22 press-fitted on the inner peripheral side of the hollow support portion 23, and the outer peripheral surface of the boss portion 17 of the output shaft 9. Through a discharge hole 26 penetrating in the axial direction of the outer ring 18c of the rolling bearing 18, an annular groove 27 formed in the inner surface of the rear cover 12, and a discharge oil passage 29 for discharging the lubricating oil formed in the rear cover 12. It is discharged from the space to a place where it does not adhere to the belt and pulley. In other words, the lubricating oil supplied to the rolling bearing 18 is discharged from the discharge path to a location where it does not adhere to the pulleys 6, 7 and the belt 8 even if it flows between the rolling bearing 18 and the seal ring 22. The oil can be circulated, and as a result, it is possible to prevent or suppress a situation in which the lubricating oil stays in the rolling bearing for a long period of time or the lubricating oil deteriorates accordingly.

  Next, another embodiment of the dry belt type continuously variable transmission according to the present invention will be described with reference to FIG. The dry belt type continuously variable transmission in this other embodiment has substantially the same configuration as that of the foregoing embodiment, and the rolling bearing according to the present invention includes an inner ring fitted to the output shaft, and an outer peripheral surface of the inner ring. An outer ring that rotates relative to the inner ring with a rolling element interposed therebetween, and the hollow support portion is formed integrally with the outer ring.

  Specifically, the rolling bearing 31 is fitted to the end portion of the output shaft 9 and the housing 12, and holds the output shaft 9 rotatably. The rolling bearing 31 includes an outer ring 31c that rotates relative to the inner ring 31a with a rolling element 31b interposed between the inner ring 31a fitted to the bearing fitting portion 19 of the output shaft 9 and the outer peripheral surface of the inner ring 31a. And have. The inner ring 31 a of the rolling bearing 31 is pressed against the wall surface 17 a of the boss portion 17 of the output shaft 9 by the lock nut 20 in the axial direction. Further, the outer ring 31c of the rolling bearing 31 is pressed in the axial direction by a stopper plate, which will be described later, against the rear cover 12.

  The hollow support portion 32 has a cylindrical shape and is formed on the outer ring 31 c of the rolling bearing 31. The inner diameter of the hollow support portion 32 is smaller than the outer diameter of the rolling bearing 31. The hollow support portion 32 is provided with a seal ring 33 having an inner diameter smaller than the outer diameter of the rolling bearing 31 on its inner diameter, and keeps the rolling bearing 31 in a lubricated state together with the seal ring 33. That is, the hollow support portion 32 and the seal ring 33 maintain a liquid-tight state in which the lubricating oil is sealed so that the lubricating oil that is liquid does not leak to the pulley 7, the belt 8, or the like.

  Further, the stopper plate 34 is fitted with the outer ring 31c of the rolling bearing 31 and the hollow support part 32 at the inner periphery thereof, and presses the outer ring 31c of the rolling bearing 31 against the housing side in the axial direction of the output shaft 9, The pulley 7 and the rolling bearing 31 are positioned.

  Further, the dry type continuously variable transmission according to the present invention is provided with a discharge path for discharging the lubricating oil from between the rolling bearing 31 and the seal ring 33. Specifically, the outer ring 31c of the rolling bearing 31 is provided with at least one discharge hole 35 penetrating in the axial direction. The discharge hole 35 is formed on the inner diameter side of the hollow support portion 32 on one side surface of the outer ring 31c, communicates with the space between the rolling bearing 31 and the seal ring 33, and lubricates the oil accumulated in the space with the pulley. It discharges to the place which does not adhere to 6, 7 and belt 8. An annular groove 27 centering on the axis of the rolling bearing 31 is provided on the inner surface of the rear cover 12 to which the side surface of the rolling bearing 31 is fitted, and this annular groove 27 is formed on the other side surface of the outer ring 31c. It communicates with the formed discharge hole 35. The rear cover 12 is provided with a lubricating oil discharge oil passage 28 for discharging the lubricating oil. Since the lubricating oil discharge oil passage 28 communicates with the annular groove 27, the lubricating oil accumulated in the space between the rolling bearing 31 and the seal ring 33 can be discharged.

  A seal member 36a that is sandwiched in the axial direction and seals the rolling bearing 31 in a sealed state is provided at a portion where the rolling bearing 31 and the housing 12 are fitted. Specifically, an annular groove 36 is formed in the outer ring 31 c of the rolling bearing 31, and an O-ring 36 a is provided in the annular groove 36. The O-ring 36 a is provided on the contact surface between the housing 12 and the outer ring 31 c of the rolling bearing 31 in the axial direction of the output shaft 9, and prevents the lubricating oil from leaking from the contact surface to the pulley 7 and the belt 8. doing. In other words, the O-ring 36a maintains a liquid-tight state in which the lubricating oil is sealed so that the lubricating oil, which is a liquid, does not leak to the pulley 7, the belt 8, or the like.

  In addition, an example of the assembly process in the other embodiments is substantially the same as the example of the attachment process in the above-described embodiment.

  Next, the operation in this other embodiment will be described. The lubricating oil supplied from the lubricating oil supply oil passage 22 is supplied to the rolling bearing 31 through the space between the inner surface of the rear cover 12, the outer peripheral surface of the end portion of the output shaft 9, and the lock nut 20. The lubricating oil supplied to the rolling bearing 31 lubricates the rolling bearing 31, and the outer circumferential surface of the boss portion 17 of the output shaft 9 in the axial direction of the output shaft 9 from between the outer ring 31 c and the inner ring 31 a of the rolling bearing 31. Of these, it enters between the rolling bearing 31 and the fixed sheave 10. Between the rolling bearing 31 and the fixed sheave 10 in the outer peripheral surface of the boss portion 17 of the output shaft 9 in the axial direction of the output shaft 9, a hollow support portion 32 formed integrally with the outer ring 31c of the rolling bearing 31 is provided. A space is formed between the inner peripheral portion and the seal ring 33 press-fitted into the inner diameter of the hollow support portion 32 and the outer peripheral surface of the boss portion 17 of the output shaft 9. This space is held in a sealed state by a hollow support portion 32 formed integrally with the outer ring 31 c of the rolling bearing 31 and a seal ring 33 press-fitted into the inner diameter of the hollow support portion 32. In other words, the seal ring 22 is arranged between the rolling bearing 31 to which the lubricating oil is supplied and the pulley 7, and the rolling bearing 31 is isolated from the pulley 7 in a sealed state, so that the lubricating oil leaks to the pulley side. Therefore, the friction coefficient between the belt and the pulley can be prevented from decreasing. In other words, dry torque transmission can be established and maintained.

  Further, since the inner diameter of the seal ring 33 is smaller than the outer diameter of the rolling bearing 31, the relative peripheral speed associated with the rotation of the rotating shaft is reduced, and power loss due to frictional sliding of the seal ring is reduced. Can do.

  Further, since the diameter of the seal ring 33 is reduced, the diameter of the portion where the seal ring 33 is mounted or fitted is also reduced, so that the processing area of the portion is reduced and the productivity or the manufacturing cost can be improved. .

  Further, the seal ring 33 has an inner diameter smaller than the outer diameter of the rolling bearing 31, but can be easily assembled by fitting the rotating shaft before the rolling bearing, and in this state, the rotating shaft is assembled to the housing. Therefore, there is no problem in assembling, and the amount of misalignment of the rotating shaft and the belt can be set as expected.

  Moreover, the stopper plate 34 can adjust the amount of misalignment in the rotational direction of the belt by positioning the rolling bearing 31 and the housing 12, and can further improve the torque transmission efficiency.

  Further, the lubricating oil that has entered the space between the seal ring 33 press-fitted on the inner peripheral side of the hollow support portion 32 and the outer peripheral surface of the boss portion 17 of the output shaft 9 extends in the axial direction of the outer ring 31 c of the rolling bearing 31. It does not adhere to the belt 8 and the pulley 7 from the space through the exhaust hole 35 penetrating through, the annular groove 27 formed in the inner surface of the rear cover 12, and the lubricating oil discharge oil passage 28 for discharging the lubricating oil formed in the rear cover 12. It is discharged to the place. In other words, the lubricating oil supplied to the rolling bearing 31 is discharged from the discharge path to a location where it does not adhere to the pulleys 6, 7 and the belt 8 even if it flows between the rolling bearing 31 and the seal ring 33. The oil can be circulated, and as a result, it is possible to prevent or suppress a situation in which the lubricating oil stays in the rolling bearing for a long period of time or the lubricating oil deteriorates accordingly.

  In addition, although the structure mentioned above was mentioned taking the secondary pulley as an example, the structure for the primary pulley may be sufficient. The dry belt type continuously variable transmission according to the present invention basically includes a bearing to which lubricating oil is supplied, a rotating portion that should avoid adhesion of the lubricating oil, and a seal ring that keeps the bearing in a lubricating state. It is only necessary to prevent the lubricating oil from leaking from the bearing to the rotating part and reduce the drag loss of the seal ring. Further, the dry belt type continuously variable transmission according to the present invention is not limited to the one mounted on the vehicle.

  DESCRIPTION OF SYMBOLS 1 ... Dry belt type continuously variable transmission, 7 ... Pulley, 8 ... Belt, 9 ... Output shaft (rotary shaft), 12 ... Housing, 18 ... Rolling bearing, 22 ... Seal ring, 23 ... Hollow support part, 24 ... Stopper Plate (stopper), 26 ... through hole, 27 ... annular groove, 28 ... lubricating oil discharge passage, 30a ... O-ring (seal member).

Claims (3)

A belt that transmits torque without using lubricating oil is wound around the pulley, and the rotating shaft provided with the pulley is supported by the housing via a rolling bearing that is lubricated by the lubricating oil. In a step transmission,
A seal ring having an inner diameter smaller than the outer diameter of the rolling bearing is fitted between the rolling bearing and the pulley in the outer circumferential surface of the rotating shaft, and the seal ring is fitted to the inner circumferential surface. , hollow support portion of smaller inner diameter than the outer diameter of the rolling bearings, provided we are so integrated with the housing,
The rolling bearing has an inner ring fitted to the rotating shaft and an outer ring that rotates relative to the inner ring with a rolling element interposed between the inner ring and an outer peripheral surface of the inner ring,
A stopper is provided on the inner side surface of the housing to press and fix the outer ring against the housing in the axial direction.
The hollow support portion is formed integrally with the stopper,
A discharge hole for discharging the lubricating oil between the rolling bearing and the seal ring to a place where the lubricating oil is not attached to the belt and the pulley is formed through the outer ring in the axial direction thereof,
A sealing material for sealing the space between the stopper and the housing in a sealed state is provided on both sides of the outer ring on the outer peripheral side of the discharge hole.
Dry belt-type continuously variable transmission, wherein a call. A belt that transmits torque without using lubricating oil is wound around the pulley, and the rotating shaft provided with the pulley is supported by the housing via a rolling bearing that is lubricated by the lubricating oil. In a step transmission,
A seal ring having an inner diameter smaller than the outer diameter of the rolling bearing is fitted between the rolling bearing and the pulley in the outer circumferential surface of the rotating shaft, and the seal ring is fitted to the inner circumferential surface. A hollow support portion having an inner diameter smaller than the outer diameter of the rolling bearing is provided integrally with the housing;
Before SL rolling bearing has an inner ring fitted to said rotary shaft, and the outer ring to rotate relative to the inner ring of the rolling element is interposed between the outer peripheral surface of the inner ring,
Before SL hollow support portion is formed integrally with the front Kigairin,
A discharge hole for discharging the lubricating oil between the rolling bearing and the seal ring to a place where the lubricating oil is not attached to the belt and the pulley is formed through the outer ring in the axial direction thereof,
On the outer peripheral side of the discharge hole, a sealing material is provided on the side surface of the outer ring on the housing side so as to seal the space between the housing and the housing.
It shall be the feature and this dry belt-type continuously variable transmission. A belt that transmits torque without using lubricating oil is wound around the pulley, and the rotating shaft provided with the pulley is supported by the housing via a rolling bearing that is lubricated by the lubricating oil. In a step transmission,
A seal ring having an inner diameter smaller than the outer diameter of the rolling bearing is fitted between the rolling bearing and the pulley in the outer circumferential surface of the rotating shaft, and the seal ring is fitted to the inner circumferential surface. A hollow support portion having an inner diameter smaller than the outer diameter of the rolling bearing is provided integrally with the housing;
Before SL rolling and discharging Detchi the lubricating oil is discharged to the portion which does not adhere to the belt and the pulley is further provided between the seal ring,
The discharge path is formed on the same axis as the rolling bearing at a discharge hole formed so as to penetrate the rolling bearing in the axial direction thereof, and a portion of the housing where the rolling bearing is in close contact and the discharge port is open. And an oil drainage path for communicating the annular groove with the portion where the lubricating oil does not adhere to the belt and the pulley.
It shall be the feature and this dry belt-type continuously variable transmission.

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