JP5238962B2 - Conical pulley type wound transmission and vehicle equipped with the transmission - Google Patents

Description

  The present invention relates to a conical pulley-type wound transmission and a vehicle including the transmission.

  The conical pulley-type transmission is conical compared to a manual transmission or another automatic transmission, as well as the high comfort that is possible by continuously changing gear ratio changes made automatically. The fuel efficiency improvements possible with pulley-type wound transmissions are also gaining popularity, especially in passenger cars.

  This type of continuously variable automatic transmission has, for example, a starting unit, a planetary gear type forward / reverse switching transmission device that is a forward / reverse traveling unit, a hydraulic pump, a variator, an intermediate shaft, and a differential. ing. The variator consists of two conical pulley pairs and a winding mechanism. Each conical pulley pair has a second conical pulley movable and slidable in the axial direction. A winding mechanism such as a belt with a push piece, a pull chain, or a belt runs between the pair of conical pulleys. Through the adjustment of the second conical pulley, the turning radius of the winding mechanism changes, and as a result, the transmission ratio of the continuously variable automatic transmission changes.

  The continuously variable automatic transmission transmits enough torque so that the conical pulley of the variator can be adjusted at the desired speed at any operating point and with sufficient basic pressing pressure without wear Therefore, a high pressure level is required.

  The problem underlying the present invention is to provide a conical pulley-type wound transmission that can be advantageously manufactured with high operating strength and has a long service life.

  This problem is solved by the features of claim 1.

  The dependent claims 2 to 8 are directed to advantageous constructions and improvements of the conical pulley-type wound transmission according to the invention.

  A vehicle equipped with a transmission according to the invention is protected by claim 9.

  The conical pulley type wound transmission according to the present invention has a conical pulley pair on the driving side and a conical pulley pair on the driven side, each of which has one fixed pulley and one conical pulley pair. Built-in movable pulley. The fixed pulley and the movable pulley are respectively disposed on the driving side and driven side shafts, and can be coupled via a winding means for torque transmission. In this case, the at least one shaft has at least one axial bore extending in the longitudinal direction of the shaft. At least one coupling hole starts from the axial hole and extends toward the outer peripheral surface of the shaft. The opening of the coupling hole provided in the outer peripheral surface is arranged in a region covered by the movable pulley without being influenced by the axial position of the movable pulley, and the outer peripheral surface of the shaft and the inner surface in the radial direction of the movable pulley. The annular chamber formed between is provided with a derivation device for deriving bubbles from the annular chamber. The annular chamber can be loaded with hydraulic pressure through the coupling hole.

  Due to the coupling hole leading to the outer peripheral surface of the shaft, a short configuration in the axial direction of the axial hole is possible. This is inexpensive and allows for axial shortening. With the derivation device, the bubbles in the annular chamber flow out, so that the rust formation of the mating part on the slide seat of the movable pulley can be reduced or completely avoided.

  The movable pulley is preferably non-rotatable but is connected to the shaft via a tooth row, which is arranged in the region of the annular chamber.

  More advantageously, in the conical pulley-type wound transmission, the opening of the coupling hole from the outer peripheral surface is arranged in the region of the tooth row, and the lead-out device is formed by an axial groove. This axial groove starts from the opening and its bottom is lowered with respect to the outer peripheral surface of the shaft, i.e. provided at a low position.

  The dentition is preferably not provided in the region between the axial groove and the opening of the coupling hole.

  The lead-out device may be formed by a lead-out hole that is separated from the opening of the coupling hole at an axial interval from the annular chamber. The outlet hole communicates with the axial hole.

  An axial groove can start from the opening of the outlet hole. The bottom of this axial groove is recessed in the outer peripheral surface of the shaft.

  In a further advantageous configuration of the conical pulley-type wound transmission according to the invention, the annular chamber is sealed on one side by a sealing part arranged between the shaft and the axial flange of the movable pulley. The lead-out device is arranged in an annular chamber between the seal part and the opening of the coupling hole.

  Further advantageously, on the side of the annular chamber opposite to the sealing part with respect to the coupling hole, the coupling passage extends from the annular chamber to a pressure chamber for loading the movable pulley with hydraulic pressure passing through the movable pulley. Departure.

  The conical pulley-type winding transmission according to the present invention is a conical pulley-type winding transmission having a conical pulley pair on the driving side and a conical pulley pair on the driven side. It has a fixed pulley and a movable pulley, and the conical pulley pair is arranged on the drive side shaft and the driven side shaft, respectively, and can be coupled via a winding means for torque transmission. And at least one shaft has at least one axial hole extending in a longitudinal direction of the shaft, and at least one coupling hole extending from the axial hole toward the outer peripheral surface of the shaft. The opening of the coupling hole is disposed on the outer peripheral surface in the region covered by the movable pulley without being influenced by the axial position of the movable pulley, Derivation for deriving bubbles from the annular chamber into an annular chamber formed between the outer peripheral surface of the shaft and the radially inner surface of the movable pulley and capable of being loaded with hydraulic pressure through the coupling hole. A device is provided.

  In the conical pulley-type wound transmission according to the present invention, preferably, the movable pulley is coupled to the shaft via a tooth row so as to be slidable in the axial direction although it is not relatively rotatable. A dentition is arranged in the region of the annular chamber.

  In the conical pulley-type wound transmission according to the present invention, advantageously, the opening of the coupling hole from the outer peripheral surface is disposed in the region of the dentition, and the lead-out device is formed by an axial groove. The axial groove starts from the opening of the coupling hole, and the bottom of the axial groove is lowered with respect to the outer peripheral surface of the shaft.

  In the conical pulley-type wound transmission according to the present invention, the tooth row of the shaft is advantageously not provided in the region of the axial groove and the region of the opening of the coupling hole.

  In the conical pulley-type winding transmission according to the present invention, the lead-out device is advantageously formed by a lead-out hole that is separated from the opening of the coupling hole at an axial interval from the annular chamber, The outlet hole communicates with the axial hole.

  In the conical pulley-type wound transmission according to the present invention, advantageously, an axial groove starts from the opening of the outlet hole, and the bottom of the axial groove is in contact with the outer peripheral surface of the shaft. It is recessed.

  In the conical pulley-type wound transmission according to the present invention, the annular chamber is advantageously sealed on one side by a seal portion disposed between the shaft and an axial flange of the movable pulley. The lead-out device is disposed in the annular chamber between the seal portion and the opening of the coupling hole.

  The conical pulley-type winding transmission according to the present invention advantageously passes through the movable pulley from the annular chamber on the side of the annular chamber opposite to the seal portion with respect to the coupling hole. The connecting passages that start out to the pressure chamber for loading the movable pulley with hydraulic pressure.

  A vehicle equipped with a conical pulley-type wound transmission according to the present invention is provided with the transmission according to any one of claims 1 to 8.

  In the following, the invention will be described in detail by way of example with reference to the schematic drawings.

  FIG. 1 shows a portion of a conical pulley-type winding transmission, that is, a driving side or an input side portion of a conical winding transmission, generally designated by reference numeral 1, driven by a prime mover, for example, an internal combustion engine. It is shown. In the fully configured conical winding transmission, the input side portion is correspondingly arranged with the continuously formed conical pulley-type winding transmission portion that can be adjusted steplessly. Has been. In this case, the two parts are connected to each other via winding means, for example in the form of a link plate chain 2, for torque transmission. The conical pulley-type wound transmission 1 has a shaft 3 on the input side, and in the illustrated embodiment, this shaft 3 is formed in one piece, that is, integrally with a conical pulley or a fixed pulley 4 at a fixed position. ing. The axially fixed conical pulley 4 is located adjacent to and opposite to the axially slidable conical pulley or movable pulley 5 in the longitudinal direction of the shaft 3.

  Torque produced by a prime mover (not shown) is introduced via a gear 6 supported on the shaft 3 to the drive-side portion of the conical pulley-type wound transmission shown in FIG. The gear 6 is supported on the shaft 3 via a rolling bearing in the form of a ball bearing 7 that receives axial and radial forces. The ball bearing 7 is fixed in the axial direction on the shaft 3. A torque sensor 10 is provided between the gear 6 and the axially slidable conical pulley 5. The torque sensor 10 has an expanding disk 11 at a fixed position in the axial direction. This spreading disk 11 is similarly supported by a support ring 12 in a fixed position in the axial direction, and cooperates with a spreading surface 14 formed directly on the movable disk 5 via rolling elements formed as balls 13.

  In the state shown in FIG. 1, the movable pulley 5 is at the position of the movable pulley 5 that is maximally spaced from the fixed pulley, that is, the transmission is in an underdrive.

  The torque introduced via the gear 6 leads to a relative rotation between the expanding disk 11 in a fixed position in the axial direction and the expanding surface 14 of the movable pulley 5 which is slidable in the axial direction, and in particular thereby rolling. Based on the slope, the movable pulley is slid in the axial direction to the right in the drawing. A ball rolls along the rolling slope.

  The torque sensor 10 further has a pressure chamber 14. The pressure chamber 14 is partitioned by the shaft 3, the movable pulley 5, the support ring 12, and the sensing piston 15. This sensing piston 15 follows the axial movement of the ball 13. Therefore, the position of the sensing piston 15 depends on the torque. An inflow hole 16 communicates with the pressure chamber 14, and the inflow hole 16 can be loaded with a hydraulic medium through an axial hole 18 in the center of the shaft 3. The opening of the inflow hole 16 is sufficiently closed by the left edge of the flange 20 of the movable pulley 5 in the illustrated underdrive position of the pulley set. Furthermore, the outflow hole 22 communicates with the pressure chamber 14. The outflow hole 22 communicates with the axial outflow passage 24 of the shaft 3. The effective cross section of the outflow hole 22 is affected by the position of the sensing piston 15. The force applied to the movable pulley as a whole by the described arrangement can be varied in a manner known per se in relation to torque and in relation to the transmission ratio.

  A separate pressure chamber 26 works for adjusting the movable pulley 5. The pressure chamber 26 is formed between the support ring 12 and the ring piston 28 attached to the movable pulley 5, and the annular chamber 32 is connected to the pressure chamber 26 through a coupling passage 30 that is guided through the movable pulley 5. The hydraulic pressure means is supplied from. The annular chamber 32 is formed between the inner surface of the movable pulley 5 or the notch of the flange 20 of the movable pulley 5 and the outer peripheral surface of the shaft 3. An axial tooth row 34 is provided inside the annular chamber 32. The movable pulley 5 is engaged with the shaft 3 through the axial tooth row 34 so as to be slidable in the axial direction although it is not relatively rotatable. A coupling hole 36 formed in the shaft 3 communicates with the annular chamber 32. The annular chamber 32, and thus the pressure chamber 26, can be loaded with a control pressure via this coupling hole 36, and this control pressure can be supplied to an axial hole 38 of the shaft 3 formed as a blind hole 38. The control pressure for adjusting the transmission gear ratio in contact with the axial hole 38 is controlled by a control device in a known manner, and this control device controls the movable pulley 5 to a pressure depending on the torque existing in the pressure chamber 14. In addition, an additional load is applied at an adjustment pressure related to the driving conditions of the vehicle.

  The illustrated transmission is compact and its structure is well known.

  The pressure chambers 14, 26, which are loaded with different pressures in a plurality of operating zones, need to be clearly separated from one another hydraulically due to the different functions of the transmission. This is done, for example, by a seal part configured as a seal ring 40. The seal portion seals between the end region on the left side in FIG. 1 of the movable pulley fixed flange 20 and the outer peripheral surface of the shaft 3.

  As can be seen directly from FIG. 1, a blind chamber region 42 of the annular chamber 32 is formed on the left side of the dentition. The hydraulic pressure means does not flow out from the blind chamber region 42 by the seal portion 40. The guide surfaces formed on the inner side of the flange 20 and the outer side of the shaft 3 guide the movable pulley 5 in the axial direction and absorb the high tilting force caused by the crimping of the link plate chain, so that the hydraulic surface is constantly renewed. Since it is not lubricated by the pressure means, high demands are made on the state of the hydraulic pressure means in order to avoid corrosion of the fitting. For example, if permanent bubbles that promote corrosion are present in the adjacent blind chamber region 42, this may lead to corrosion of the fitting portion.

  Accordingly, the annular chamber 32 is advantageously provided with a derivation device for deriving air or bubbles. Examples of this type of derivation device will be described below with reference to FIGS. In this case, FIG. 2 shows an enlarged portion of FIG. 1, FIG. 3 shows only a portion of the shaft visible in FIG. 2, and FIG. 4 shows the plane IV-IV of the shaft. A longitudinal sectional view of FIG. 1 is shown.

  According to the drawing, the coupling hole 36 leads to the annular chamber 32 in the region of the axial tooth row 34. This has not only the advantage of better lubrication of the dentition, but also the mechanical advantage for the opening of the coupling hole 36 to the area of the turning part on the right side of the dentition 34 in the drawing. doing.

As is particularly apparent from FIGS. 3 and 4, an axial groove 46 protrudes from the opening of the coupling hole 36 into the blind chamber region 42 of the annular chamber 32. The axial grooves 46 have been recessed in the groove bottom of the teeth 34 ₁ of the shaft 3, as a result, the bottom of the axial groove 46 is positioned lower than the outer circumferential surface 44 adjacent the shaft 3. This outer peripheral surface 44 forms one guide surface 44 in the extension on the longitudinal direction side in the drawing. By disposing the bottom of the axial groove 46 with respect to the outer peripheral surface 44 at a lower position, bubbles that are sometimes present in the blind chamber region 42 during the rotation of the shaft are “negative” because of the slight specific gravity compared to the hydraulic fluid. Due to the centrifugal force, the bubble moves into a very small diameter part of the annular chamber, i.e. the bubble flows from the hydraulic fluid into the blind hole 36 at the incoherent part of the rotary feed, so that the bubble is axially grooved. 46 and from there through the coupling hole 36 and the axial hole 38 and possibly out of the device.

  Similarly, a guide surface 45 (FIG. 1) is formed on the right side of the tooth row 34 in order to guide the movable pulley 5 in the shaft 3. However, there is no or very little risk of corrosion of the fitting. This is because the guide surfaces are not sealed together (a small amount of hydraulic fluid can flow into the space between the two conical pulleys). However, in some cases, it may be advantageous to form an axial groove similar to the axial groove 46 shown on the right side of the opening of the coupling hole 36.

FIG. 4 shows a cross-sectional view of the arrangement. The axial groove 4 is clearly visible and this axial groove 46 is lowered with respect to the tooth root with the height indicated by the reference numeral 48. Further in FIG. 4, in the region of the coupling hole 36 is visible also clearly that are missing one tooth axial teeth 34 ₁ of the shaft 3. According to FIG. 4, three blind holes 38 are formed in the shaft 3 at the same angular interval with an associated coupling hole 36. In this case, the dentition is missing in the area of each opening. The dentition does not have to be missing over the entire axial length, preferably only in the region of the dentition that covers the opening of the coupling hole 36, or the region in which the axial groove 46 extends in the longitudinal direction. Is missing along. Furthermore, according to FIG. 4, the axial groove 46 can start from the openings of all three coupling holes 36.

  FIG. 5 shows a cross-sectional view of an alternative embodiment similar to FIG. In this modified embodiment, a lead-out hole 50 separated from the coupling hole 36 is provided. This outlet hole 50 starts from a blind chamber region 42 or preferably an axial groove recessed in the outer peripheral surface of the shaft. It is understood that the outlet hole preferably starts from the region of the blind chamber region 42. The blind chamber region 42 is not passed by at least the seal portion 40 when the movable pulley moves to a position where it can be moved to the right at the maximum.

  The described means for deriving bubbles from the annular chamber 32, in particular from its blind chamber region 42, can be used individually or in combination. The number of axial grooves or outlet holes divided along the peripheral surface is adjusted according to the respective requirements. The degree of depression of the bottom of the axial groove 46 on the outer peripheral surface of the shaft 3 is, for example, about 0.2 mm. It is further advantageous if the engaged area of the shaft transitions through a small recess to an outer peripheral surface formed with a continuous radius of curvature as shown. The outer peripheral surface forms a guide surface. For example, it is further advantageous if the bottom of the axial groove 46 is inclined towards the opening of each coupling hole leading to the axial hole 38 of the shaft 3 by increasing the depth of the axial groove. The coupling hole 36 or the lead-out hole 50 does not need to extend in the radial direction, and can be inclined in the radial direction.

  The invention can advantageously be used anywhere where an annular blind chamber is formed around the shaft of a conical pulley-type transmission. The blind chamber is in contact with the fitting surface or the guide surface sealed from each other.

1 is a partial view of a conical pulley-type wound transmission according to the present invention. FIG. 2 is a detailed enlarged view of FIG. 1. FIG. 2 is a detailed enlarged view of FIG. 1. FIG. 4 is a partial cross-sectional view based on line IV-IV in FIG. 2. FIG. 3 is a detailed view of an alternative embodiment similar to FIG. 2 of the present invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 Conical pulley type winding transmission, 2 Link plate chain, 3 Shaft, 4 Fixed pulley, 5 Movable pulley, 6 Gear, 7 Ball bearing, 10 Torque sensor, 11 Expanding disk, 12 Support ring, 13 Ball, 14 Pressure chamber, 15 sensing piston, 16 inflow hole, 18 axial hole, 20 flange, 22 outflow hole, 24 outflow passage, 26 pressure chamber, 28 annular piston, 30 coupling passage, 32 annular chamber, 34 axial tooth row, 36 Joint hole, 38 axial hole, 40 seal part, 42 blind chamber region, 44, 45 guide surface, 46 axial groove, 48 tooth base, 50 lead hole

Claims (11)

In a conical pulley type wound transmission (1) having a conical pulley pair on the driving side and a conical pulley pair on the driven side,
The conical pulley pair has a fixed pulley (4) and a movable pulley (5), respectively;
The conical pulley pair is disposed on the drive side shaft (3) and the driven side shaft (3), respectively, and can be coupled via a winding means (2) for torque transmission,
The movable pulley (5) is coupled to the shaft (3) via a tooth row (34) so as to be slidable in the axial direction although it is not relatively rotatable.
At least one shaft (3) has at least one axial hole (38) extending in the longitudinal direction of the shaft (3), said axial hole (38) being said shaft (3). Is communicated with at least one coupling hole (36) extending toward the outer peripheral surface of the first, and the opening of the coupling hole (36) is independent of the axial position of the movable pulley (5). It is arranged on the outer peripheral surface in the region covered by the movable pulley (5), and is formed through the coupling hole (36) formed between the outer peripheral surface of the shaft and the inner surface in the radial direction of the movable pulley. The annular chamber (32), which can be loaded with hydraulic pressure, is provided with at least one outlet device (36; 50) for extracting bubbles from the annular chamber;
The first lead-out device is formed by an axial groove (46), the axial groove (46) communicates with the opening of the coupling hole (36), and the axial groove (46) A conical pulley-type winding transmission characterized in that the bottom is lowered with respect to the groove bottom of the tooth row (34) of the shaft (3). In a conical pulley type wound transmission (1) having a conical pulley pair on the driving side and a conical pulley pair on the driven side,
The conical pulley pair has a fixed pulley (4) and a movable pulley (5), respectively;
The conical pulley pair is disposed on the drive side shaft (3) and the driven side shaft (3), respectively, and can be coupled via a winding means (2) for torque transmission,
The movable pulley (5) is coupled to the shaft (3) via a tooth row (34) so as to be slidable in the axial direction although it is not relatively rotatable.
At least one shaft (3) has at least one axial hole (38) extending in the longitudinal direction of the shaft (3), said axial hole (38) being said shaft (3). Is communicated with at least one coupling hole (36) extending toward the outer peripheral surface of the first, and the opening of the coupling hole (36) is independent of the axial position of the movable pulley (5). It is arranged on the outer peripheral surface in the region covered by the movable pulley (5), and is formed through the coupling hole (36) formed between the outer peripheral surface of the shaft and the inner surface in the radial direction of the movable pulley. The annular chamber (32), which can be loaded with hydraulic pressure, is provided with at least one outlet device (36; 50) for extracting bubbles from the annular chamber;
The second lead-out device is formed by a lead-out hole (50) spaced from the opening of the coupling hole (36) with an axial interval from the annular chamber (32), and the lead-out hole (50) A conical pulley-type winding transmission, characterized in that it communicates with the axial hole (38). Before SL dentition, the annular chamber is arranged in the region of (32), according to claim 1 or 2 conical pulley type winding transmission according. Opening coupling hole (36) from said outer circumferential surface, the is arranged in the region of the groove bottom of the teeth (34), conical pulley type traction of any one of claims 1 to 3 Multi gearbox. The first lead-out device is formed by an axial groove (46), the axial groove (46) communicates with the opening of the coupling hole (36), and the axial groove (46) The conical pulley-type wound transmission according to claim 3 or 4 , wherein the bottom part is lowered with respect to the groove bottom part of the tooth row (34) of the shaft (3). . The teeth of the teeth (34) of the shaft (3) is non provided in the region of the opening area and the coupling hole of the axial groove (46) (36), according to claim 1, 5 or claim The conical pulley-type wound transmission according to claim 3 or 4, wherein Item 1 is cited . The second lead-out device is formed by a lead-out hole (50) spaced from the opening of the coupling hole (36) with an axial interval from the annular chamber (32), and the lead-out hole (50) , axial bore leads to (38), according to claim 1 or claim 3, 4, or 6-conical pulley type winding transmission according to cite claim 1. The opening of the outlet hole (50) communicates with the axial groove, and the bottom of the axial groove is recessed with respect to the groove bottom of the tooth row (34) of the shaft (3). claim 2,7 or請 Motomeko 2 conical pulley type winding transmission according to any one of claims 3 to 6 citing. The annular chamber (32) is sealed on one side by a seal (40) disposed between the shaft (3) and the axial flange (20) of the movable pulley (5); The cone according to any one of claims 1 to 8 , wherein the outlet device (34, 50) is arranged in the annular chamber between the seal part and the opening of the coupling hole (36). Pulley type wound transmission. A coupling passage extending from the annular chamber (32) through the movable pulley (5) on the side of the annular chamber (32) opposite to the seal portion (40) with respect to the coupling hole (36). 10. A conical pulley-type winding shift according to any one of claims 1 to 9 , wherein (30) communicates with a pressure chamber (26) for loading the movable pulley (5) with hydraulic pressure. Machine. A vehicle comprising the transmission according to any one of claims 1 to 10 .

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