JP2008157272A - Belt type continuously variable transmission - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a belt type continuously variable transmission capable of reducing the number of parts. <P>SOLUTION: The belt type continuously variable transmission 1 provided with a primary pulley 2 and secondary pulley 3 includes a first clutch mechanism 54 for connecting or disconnecting an input side hub 51 fixed on an input shaft 111 and a drum 52 fixed on a primary pulley shaft 21, a second clutch mechanism 55 for connecting or disconnecting the input side hub 51 and a reverse shaft side hub 53 fixed on a reverse shaft 4, a reverse drive gear 56 fixed on the reverse shaft 4, and a reverse driven gear 57 meshing with the reverse drive gear 56 and fixed on a secondary pulley shaft 31. The belt type continuously variable transmission 1 transmits input drive force of the input shaft 111 to the secondary pulley 3 in a same rotation direction by connecting the input shaft 111 and the primary pulley shaft 21, and transmits in a reverse rotation direction by connecting the input shaft 111 and the reverse shaft 4. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a belt type continuously variable transmission.

  In general, a vehicle has a transmission on the output side of the drive source in order to transmit a driving force from an internal combustion engine or an electric motor that is a drive source, that is, an output torque, to the road surface under an optimal condition according to the traveling state of the vehicle. Is provided. The transmission includes a continuously variable transmission that controls the gear ratio steplessly (continuously) and a stepped transmission that controls the gear ratio stepwise (discontinuously). Here, the continuously variable transmission includes a belt-type continuously variable transmission that transmits a driving force from the primary pulley to the secondary pulley via a belt wound around the primary pulley and the secondary pulley.

  In addition to the two pulleys and the belt, the belt-type continuously variable transmission is provided with a rotation direction switching mechanism that transmits an output torque, which is a driving force, to the primary pulley shaft of the primary pulley in the same rotation direction or the reverse rotation direction. Yes.

  A conventional belt type continuously variable transmission is provided with, for example, a rotation direction switching mechanism using a planetary gear device (forward / reverse switching device) as shown in Patent Document 1. The rotation direction switching mechanism shown in Patent Document 1 includes a sun gear, a pinion gear, and an internal gear that are sequentially arranged in the radial direction of an input shaft (rotary shaft) or an output shaft (drive shaft). Here, the pinion gear meshes with the sun gear and the internal gear, and is rotatably supported by the carrier.

  A conventional rotation direction switching mechanism connects an internal gear and a sun gear, connects a forward clutch that transmits the rotational force of the input shaft to the output shaft in the same rotation direction, and a carrier to a stationary member (casing), and inputs And a reverse brake for transmitting the rotational force of the shaft to the output shaft in the reverse rotation direction. These forward clutches and reverse brakes have a plurality of ring-shaped clutch plates arranged in the axial direction, and connect the internal gear and the sun gear and connect the carrier and the stationary member by the frictional force between the clutch plates. Is.

Japanese Patent No. 3284734

  However, the conventional belt-type continuously variable transmission requires a large number of components such as a planetary gear mechanism, a forward clutch, and a reverse brake, and has a problem that the number of components is large.

  Accordingly, the present invention has been made in view of the above, and an object of the present invention is to provide a belt type continuously variable transmission capable of reducing the number of parts.

  In order to solve the above-described problems and achieve the object, in the present invention, a belt is provided between a fixed sheave fixed to a pulley shaft and a movable sheave supported so as to be movable in the axial direction with respect to the pulley shaft. In a belt-type continuously variable transmission including two pulleys that transmit driving force from one side to the other by being sandwiched, the first pulley shaft and an input shaft to which the driving force is input are connected or released. 1 connection release means, a reverse shaft rotatably supported, a second connection release means for connecting or releasing the connection, a reverse shaft and the other pulley shaft, And a reverse driving force transmission means for reversing and connecting the rotation direction of the other pulley shaft.

  According to the present invention, in the belt type continuously variable transmission, the first connection release means connects the one pulley shaft and the input shaft, and the second connection release means releases the connection between the reverse shaft and the input shaft. In the same rotation direction state, the first connection release means releases the connection between the one pulley shaft and the input shaft, and the second connection release means connects the reverse shaft and the input shaft in the reverse rotation direction state, the first connection. The releasing means releases the connection between the one pulley shaft and the input shaft, and the second connection releasing means constitutes a neutral state in which the connection between the reverse shaft and the input shaft is released. .

  According to the present invention, in the belt-type continuously variable transmission, the reverse shaft is disposed concentrically with the one pulley shaft and is rotatably supported by the one pulley shaft. This is a first clutch mechanism for connecting or releasing the input side hub fixed to the shaft and the drum fixed to one pulley shaft, and the second connection release means is fixed to the input side hub and the reverse shaft. The reverse clutch side hub is connected to or released from the reverse shaft side hub, and the reverse drive force transmission means is engaged with the reverse drive gear fixed to the reverse shaft, the reverse drive gear, and the other It is comprised by the reverse driven gear fixed to a pulley axis | shaft.

  According to the present invention, the first connection release means connects the one pulley shaft and the input shaft, and the second connection release means releases the connection between the reverse shaft and the input shaft, so that the input is input to the input shaft. The driving force is transmitted to one pulley, and the other pulley connected to the one pulley shaft through the belt can rotate in the same rotational direction as the input shaft. Further, the first connection release means releases the connection between one pulley shaft and the input shaft, and the second connection release means connects the reverse shaft and the input shaft, so that the driving force input to the input shaft is reduced. It transmits to the reverse driving force transmission means via the reverse shaft, not via one pulley. Since the reverse driving force transmission means is connected by reversing the rotation direction of the reverse shaft and the rotation direction of the other pulley shaft, the driving force input to the input shaft does not pass through one pulley and the reverse driving force transmission means. Is transmitted to the other pulley shaft, and the other pulley including the other pulley shaft can rotate in the direction opposite to the input shaft. Further, the first connection release means releases the connection between the one pulley shaft and the input shaft, and the second connection release means releases the connection between the reverse shaft and the input shaft, so that the driving force input to the input shaft is obtained. Is not transmitted to one of the pulley shaft and the reverse shaft, and the driving force can not be transmitted to the other pulley. Therefore, the rotational direction in which the driving force input to the input shaft is transmitted to the other pulley can be switched without using the planetary gear mechanism. Thereby, the number of parts can be reduced as compared with a belt type continuously variable transmission including a rotation direction switching mechanism including a conventional planetary gear mechanism, a forward clutch, and a reverse brake.

  The belt type continuously variable transmission according to the present invention has an effect that the number of parts can be reduced.

  Hereinafter, the present invention will be described in detail with reference to the drawings. In addition, this invention is not limited by the following embodiment. In addition, constituent elements in the following embodiments include those that can be easily assumed by those skilled in the art or that are substantially the same. Here, the belt type continuously variable transmission in the following embodiment is provided in a vehicle, and switches the direction of the driving force from the driving source transmitted to the secondary pulley which is the other pulley. In the following embodiment, an internal combustion engine (a gasoline engine, a diesel engine, an LPG engine, or the like) is used as a drive source. However, the present invention is not limited to this, and an electric motor such as a motor may be used as the drive source. good.

[Embodiment]
FIG. 1 is a diagram showing a configuration example of a belt type continuously variable transmission according to the present invention. FIG. 2 is an operation explanatory view of the belt type continuously variable transmission according to the present invention. FIG. 3 is an explanatory view of the operation of the belt type continuously variable transmission according to the present invention. As shown in FIG. 1, the belt type continuously variable transmission 1 according to the present invention receives a driving force of an internal combustion engine 100 as a driving source, that is, an output torque, and inputs the output torque of the internal combustion engine 100 to a predetermined value. The gear ratio is transmitted to the wheels 150 and 150. Further, the belt type continuously variable transmission 1 according to the present invention switches the transmission direction of the output torque of the input internal combustion engine, that is, the rotational direction to the same rotational direction or the reverse rotational direction.

  Here, the output torque of the internal combustion engine 100 is transmitted to the torque converter 110 via the crankshaft 101. The torque converter 110 is a starting mechanism, and transmits the output torque of the internal combustion engine 100 to the belt type continuously variable transmission 1 with a predetermined torque characteristic. The output torque of the internal combustion engine 100 having a predetermined torque characteristic by the torque converter 110 is transmitted to the belt type continuously variable transmission 1 via the input shaft 111.

  The output torque of the internal combustion engine 100 whose gear ratio is changed to a predetermined gear ratio by the belt-type continuously variable transmission 1 transmits power via the secondary pulley shaft 31 of the secondary pulley 3 described later of the belt-type continuously variable transmission 1. Is transmitted to the path 120. The power transmission path 120 connects the belt type continuously variable transmission 1 and the final reduction gear 130. The output torque of the internal combustion engine 100 transmitted to the power transmission mechanism 120 is transmitted to the final reducer 130, and the wheels 150, 150 are connected to the final reducer 130 via the drive shafts 140, 140 connecting the wheels 150, 150. Is transmitted to.

  A belt type continuously variable transmission 1 according to the present invention includes a primary pulley 2, a secondary pulley 3, a reverse shaft 4, and a rotation direction switching mechanism 5.

  The primary pulley 2 is one pulley and transmits the output torque from the internal combustion engine 100 transmitted via the rotation direction switching mechanism 5 to the secondary pulley 3 that is the other pulley by the belt V. As shown in FIG. 1, the primary pulley 2 generates a belt clamping pressure on the primary pulley shaft 21, the primary fixed sheave 22, the primary movable sheave 23, and the primary pulley 2. It is constituted by a primary hydraulic chamber 24 for changing the gear ratio.

  The primary pulley shaft 21 is rotatably supported by bearings 25 and 26. The primary pulley shaft 21 has a hollow structure, and the reverse shaft 4 is disposed in the space. Here, the reverse shaft 4 is arranged concentrically with the primary pulley shaft 21 which is one pulley shaft. The reverse shaft 4 is rotatably supported by the primary pulley shaft 21. For example, the reverse shaft 4 is rotatably supported by the primary pulley shaft 21 by a plurality of needle bearings 6. The reverse shaft 4 has a hydraulic oil passage (not shown) inside, and the hydraulic oil supplied from the hydraulic oil supply control device (not shown) to the primary hydraulic chamber 24 flows into the hydraulic oil passage.

  The primary fixed sheave 22 is provided to rotate integrally with the primary pulley shaft 21 at a position facing the primary movable sheave 23. Here, the primary fixed sheave 22 is formed as an annular portion that protrudes radially outward from the outer periphery of the primary pulley shaft 21. That is, in the embodiment, the primary fixed sheave 22 is integrally provided on the outer periphery of the primary pulley shaft 21.

  The primary movable sheave 23 is spline-fitted to the primary pulley shaft 21 so as to be slidable on the primary pulley shaft 21 in the axial direction. That is, the primary movable sheave 23 is supported so as to be movable in the axial direction with respect to the primary pulley shaft 21. Between the primary fixed sheave 22 and the primary movable sheave 23, that is, between the surface of the primary fixed sheave 22 that faces the primary movable sheave 23 and the surface of the primary movable sheave 23 that faces the primary fixed sheave 22. Primary grooves 27 are formed. An endless belt V is wound around the primary groove 27. That is, the belt V is sandwiched between the primary fixed sheave 22 and the primary movable sheave 23.

  The primary hydraulic chamber 24 is configured by a back surface 23 a opposite to the surface facing the primary fixed sheave 22 of the primary movable sheave 23, and a ring-shaped primary partition wall 28 fixed to the primary pulley shaft 21. On the back surface 23 a of the primary movable sheave 23, a cylindrical protruding portion 23 b is formed that protrudes in one axial direction, that is, protrudes toward the primary fixed sheave 23. Between the protrusion 23b and the primary partition wall 28, a primary hydraulic chamber seal member (not shown) such as a seal ring is provided. That is, the back surface 23a of the primary movable sheave 23 and the primary partition wall 28 constituting the primary hydraulic chamber 24 are sealed by the seal member.

  The primary hydraulic chamber 24 is supplied with hydraulic oil flowing into a hydraulic oil passage (not shown) of the reverse shaft 4 via the primary pulley shaft 21. In other words, the hydraulic oil supply control device (not shown) supplies hydraulic oil to the primary hydraulic chamber 24, and the primary movable sheave 23 is slid in the axial direction by the hydraulic pressure of the primary hydraulic chamber 24, thereby making the primary movable sheave 23 the primary fixed sheave. 22 is approached or separated. The primary hydraulic chamber 24 is wound around the primary groove 27 by applying a movable sheave pressing force that presses the primary movable sheave 23 in the axial direction to the primary movable sheave 23 with hydraulic oil supplied to the primary hydraulic chamber 24. A belt clamping pressure with respect to the belt V is generated, and the axial position of the primary movable sheave 23 with respect to the primary fixed sheave 22 is changed. Thus, the primary hydraulic chamber 24 has a function of changing the gear ratio of the belt type continuously variable transmission 1.

  The secondary pulley 3 is the other pulley, and the output torque transmitted from the internal combustion engine 100 by the belt V to the primary pulley 2 is transmitted to the wheels 150, via the power transmission path 120, the final reduction gear 130, and the drive shafts 140, 140. 150. The secondary pulley 3 includes a secondary pulley shaft 31, a secondary fixed sheave 32, a secondary movable sheave 33, and a secondary hydraulic chamber 34 that adjusts the tension of the belt V by generating belt clamping pressure on the secondary pulley 3. Has been.

  The secondary pulley shaft 31 is rotatably supported by pulley bearings 35 and 36. The secondary pulley shaft 31 has a hydraulic oil passage (not shown) inside, and hydraulic oil supplied from the hydraulic oil supply control device (not shown) to the secondary hydraulic chamber 34 flows into the hydraulic oil passage.

  The secondary fixed sheave 32 is provided at a position facing the secondary movable sheave 33 so as to rotate integrally with the secondary pulley shaft 31. Here, the secondary fixed sheave 32 is formed as an annular portion that protrudes radially outward from the outer periphery of the secondary pulley shaft 31. That is, in the embodiment, the secondary fixed sheave 32 is integrally provided on the outer periphery of the secondary pulley shaft 31.

  The secondary movable sheave 33 is spline-fitted to the secondary pulley shaft 31 so as to be slidable on the secondary pulley shaft 31 in the axial direction. That is, the secondary movable sheave 33 is supported so as to be movable in the axial direction with respect to the secondary pulley shaft 31. Between the secondary fixed sheave 32 and the secondary movable sheave 33, that is, between the surface of the secondary fixed sheave 32 facing the secondary movable sheave 33 and the surface of the secondary movable sheave 33 facing the secondary fixed sheave 32. Secondary groove 37 is formed. An endless belt V is wound around the secondary groove 37. That is, the belt V is sandwiched between the secondary fixed sheave 32 and the secondary movable sheave 33.

  The secondary hydraulic chamber 34 is configured by a back surface 33 a opposite to the surface facing the secondary fixed sheave 32 of the secondary movable sheave 33, and a ring-shaped secondary partition wall 28 fixed to the secondary pulley shaft 31. On the back surface 33a of the secondary movable sheave 33, there is formed a cylindrical protruding portion 33b protruding in one axial direction, that is, protruding toward the secondary fixed sheave 33 side. Between the protrusion 33b and the secondary partition wall 38, a secondary hydraulic chamber seal member (not shown) such as a seal ring is provided. That is, the back surface 33a of the secondary movable sheave 33 and the secondary partition wall 38 constituting the secondary hydraulic chamber 34 are sealed by the seal member.

  The hydraulic oil that has flowed into the hydraulic oil passage (not shown) of the secondary pulley shaft 31 is supplied to the secondary hydraulic chamber 34. That is, the hydraulic oil supply control device (not shown) supplies hydraulic oil to the secondary hydraulic chamber 34, and the secondary movable sheave 33 is slid in the axial direction by the hydraulic pressure of the secondary hydraulic chamber 34, and the secondary movable sheave 33 is moved to the secondary fixed sheave 33. 32 is approached or separated. The secondary hydraulic chamber 34 is wound around the secondary groove 37 by applying a movable sheave pressing force that presses the secondary movable sheave 33 in the axial direction to the secondary movable sheave 33 with hydraulic oil supplied to the secondary hydraulic chamber 34. A belt clamping pressure with respect to the belt V is generated, and the axial position of the secondary movable sheave 33 with respect to the secondary fixed sheave 32 is changed. Accordingly, the secondary hydraulic chamber 34 has a function of maintaining a constant contact radius of the belt V with respect to the primary pulley 2 and the secondary pulley 3 and adjusting the tension of the belt V. Note that the secondary pulley 3 may include not only the secondary hydraulic chamber 34 but also a torque cam as means for generating a belt clamping pressure with respect to the belt V.

  The rotation direction switching mechanism 5 includes an input side hub 51, a drum 52, a reverse shaft side hub 53, a first clutch mechanism 54, a second clutch mechanism 55, a reverse drive gear 56, and a reverse driven gear 57. Has been.

  The input-side hub 51 is fixed to one end portion (the left end portion in the figure) in the axial direction of the input shaft 111. The drum 52 is fixed to the other end portion (the right end portion in the figure) in the axial direction of the primary pulley shaft 21. The reverse shaft clutch 53 is fixed to the other end portion (the right end portion in the figure) of the reverse shaft 4 in the axial direction.

  The first clutch mechanism 54 is a first connection / release means, and is provided between the input-side hub 51 and the drum 52. The first clutch mechanism 54 is configured such that the input side hub 51 is caused by frictional force generated by contacting a first input side clutch plate (not shown) provided on the input side hub 51 and a drum plate (not shown) provided on the drum 52. And the drum 52 are connected. The first clutch mechanism 54 releases the connection between the input-side hub 51 and the drum 52 by bringing the first input-side clutch plate and the drum-side clutch plate that are in contact with each other into a non-contact state. That is, the first clutch mechanism 54 as the first connection release means connects or connects the input shaft 111 and the primary pulley shaft 21 by connecting or releasing the connection between the input hub 51 and the drum 52. Release.

  The second clutch mechanism 55 is a second connection release means, and is provided between the input side hub 51 and the reverse shaft side hub 53. The second clutch mechanism 55 contacts an input-side hub by contacting a second input-side clutch plate (not shown) provided on the input-side hub 51 and a reverse-shaft side clutch plate (not shown) provided on the reverse-shaft side hub 53. 51 and the reverse shaft side hub 53 are connected. Further, the second clutch mechanism 55 releases the connection between the input side hub 51 and the reverse shaft side hub 53 by bringing the second input side clutch plate and the reverse shaft side clutch plate that are in contact with each other into a non-contact state. Is. That is, the second clutch mechanism 55 serving as the second connection release means connects the input shaft 111 and the reverse shaft 4 by connecting the input side hub 51 and the reverse shaft side hub 53 or releasing the connection. Alternatively, the connection is released.

  The first clutch mechanism 54 and the second clutch mechanism 55 operate in accordance with the position of an operation lever (not shown) operated by a driver who drives a vehicle on which the belt type continuously variable transmission 1 is mounted. . The operating lever can be positioned at least in the D range, R range, and N range. The operation of the first clutch mechanism 54 and the second clutch mechanism 55, that is, switching between contact and non-contact between the first input side clutch plate and the drum side clutch plate, and the second input side clutch plate and the reverse shaft side clutch plate Switching between contact and non-contact may be performed by directly transmitting the operation force of the operation lever, or depending on the position of the operation lever, for example, the pressure of hydraulic oil supplied by a hydraulic oil supply control device (not shown) may be used. You may carry out by the 1st clutch mechanism drive means and 2nd clutch mechanism drive means which make a driving force.

  The reverse drive gear 56 constitutes a part of the reverse drive force transmission means and is fixed to the reverse shaft 4. The reverse drive gear 56 is fixed to one end portion (left end portion in the figure) in the axial direction of the reverse shaft 4. Accordingly, the reverse drive gear 56 rotates in the same direction as the rotation direction of the reverse shaft 4 as the reverse shaft 4 rotates. The reverse drive gear 56 meshes with the reverse driven gear 57. The reverse drive gear 56 has a disk shape, and is configured by forming a plurality of teeth that can mesh with the reverse driven gear 57 on the outer peripheral surface.

  The reverse driven gear 57 constitutes a part of the reverse driving force transmission means, and is fixed to the secondary pulley shaft 31 that is the other pulley shaft. The reverse driven gear 57 is fixed to one end portion (the left end portion in the figure) in the axial direction of the secondary pulley shaft 31. The reverse driven gear 57 meshes with the reverse drive gear 56. Accordingly, the reverse driven gear 57 transmits the driving force input to the reverse shaft 4 to the secondary pulley shaft 31. The reverse driven gear 57 has a disk shape, and is configured by forming a plurality of teeth that can mesh with the reverse drive gear 56 on the outer peripheral surface. Therefore, the reverse driven gear 57 rotates in the direction opposite to the rotation direction of the reverse drive gear 56. That is, the reverse drive gear 56 and the reverse driven gear 57 which are reverse driving force transmission means connect the reverse shaft 4 and the secondary pulley shaft 31 by reversing the rotation direction of the reverse shaft 4 and the rotation direction of the secondary pulley shaft 31. It is.

  Next, the operation of the belt type continuously variable transmission 1 according to the present invention will be described. First, the same rotational direction state of the belt-type continuously variable transmission 1 when the driving force input to the input shaft 111, that is, the output torque of the internal combustion engine 100 is transmitted to the secondary pulley 3 which is the other pulley in the same rotational direction. Will be described. The driver positions an operation lever (not shown) from the N range or the R range to the D range. When the operation lever is positioned in the D range, a first input side clutch plate (not shown) of the first clutch mechanism 54 and a drum side clutch plate (not shown) come into contact with each other, and the input side hub 51 and the drum 52 are connected. At this time, the second input side clutch plate (not shown) of the second clutch mechanism 55 and the reverse shaft side clutch plate (not shown) are not in contact with each other, and the connection between the input side hub 51 and the reverse shaft side hub 53 is released. That is, when the belt-type continuously variable transmission 1 is in the same rotational direction, the first clutch mechanism 54 connects the input shaft 111 and the primary pulley shaft 21 and the second clutch mechanism 55 is input as shown in FIG. The connection between the shaft 111 and the reverse shaft 4 is released.

  Therefore, in the belt type continuously variable transmission 1, when the operation lever is positioned in the D range, the input shaft 111 and the primary pulley shaft 21 are directly connected via the input hub 51, the first clutch mechanism 54, and the drum 52. It will be in the same rotational direction. When the belt-type continuously variable transmission 1 is in the same rotational direction, the output torque of the internal combustion engine 100 input to the input shaft 111 is directly transmitted to the primary pulley shaft 21 via the rotational direction switching mechanism 5. Therefore, the rotation direction of the input shaft 111 and the rotation direction of the primary pulley 1 are the same rotation direction (direction of arrow A in the figure). The output torque of the internal combustion engine 100 transmitted to the primary pulley 2 is transmitted to the secondary pulley 3 via the belt V. Here, when the output torque of the internal combustion engine 100 is transmitted via the belt V, the rotation direction of the primary pulley 2 and the rotation direction of the secondary pulley 3 are the same rotation direction. Therefore, the rotation direction of the secondary pulley 3 is the same as the rotation direction of the input shaft 111 (the direction of arrow B in the figure). As a result, the output torque of the internal combustion engine 100 is transmitted to the wheels 150 and 150 via the belt type continuously variable transmission 1, particularly the primary pulley 2 and the secondary pulley 3, and the vehicle moves forward.

  Next, the reverse rotation direction of the belt-type continuously variable transmission 1 in which the driving force input to the input shaft 111, that is, the output torque of the internal combustion engine 100 is transmitted to the secondary pulley 3 which is the other pulley in the reverse rotation direction. The state will be described. The driver moves an operation lever (not shown) from the N range or D range to the R range. When the operation lever is positioned in the R range, a second input side clutch plate (not shown) of the second clutch mechanism 55 and a reverse shaft side clutch plate (not shown) come into contact, and the input side hub 51 and the reverse shaft side hub 53 are connected. The At this time, the first input side clutch plate (not shown) of the first clutch mechanism 54 and the drum side clutch plate (not shown) are not in contact with each other, and the connection between the input side hub 51 and the drum 52 is released. That is, in the reverse rotation direction state of the belt type continuously variable transmission 1, as shown in FIG. 3, the first clutch mechanism 54 releases the connection between the input shaft 111 and the primary pulley shaft 21, and the second clutch mechanism 55 The input shaft 111 and the reverse shaft 4 are connected.

  Therefore, in the belt type continuously variable transmission 1, when the operation lever is positioned in the R range, the input shaft 111 and the reverse shaft 4 are connected via the input side hub 51, the second clutch mechanism 55, and the reverse shaft side hub 53. Reverse rotation direction state. When the belt type continuously variable transmission 1 is in the reverse rotation direction, the output torque of the internal combustion engine 100 input to the input shaft 111 is transmitted to the reverse shaft 4 via the rotation direction switching mechanism 5. That is, in the reverse rotation direction state, the output torque of the internal combustion engine 100 input to the input shaft 111 is not transmitted to the primary pulley 2. Therefore, the rotational direction of the input shaft 111 and the rotational direction of the reverse shaft 4 are the same rotational direction (arrow A direction in the figure), and the reverse drive gear 56 that rotates integrally with the reverse shaft 4 is also the same as the rotational direction of the input shaft 111. It becomes a rotation direction (the arrow C direction of the figure). The output torque of the internal combustion engine 100 transmitted to the reverse shaft 4 is transmitted to the secondary pulley 3 via the reverse drive gear 56 and the reverse driven gear 57. Here, the rotation direction of the reverse drive gear 56 and the rotation direction of the reverse driven gear 57 are the reverse rotation directions as described above. Therefore, the rotation direction of the secondary pulley 3 that rotates integrally with the reverse driven gear 57 is the direction opposite to the rotation direction of the input shaft 111 (the direction of arrow D in the figure). As a result, the output torque of the internal combustion engine 100 is transmitted to the wheels 150 and 150 via the belt type continuously variable transmission 1, particularly the rotation direction switching mechanism 5, and the vehicle moves backward.

  Next, the neutral state of the belt-type continuously variable transmission 1 that does not transmit the driving force input to the input shaft 111, that is, the output torque of the internal combustion engine 100, to the secondary pulley 3 that is the other pulley will be described. The driver positions an operation lever (not shown) from the D range or the R range to the N range. When the operation lever is positioned in the N range, the first input side clutch plate (not shown) of the first clutch mechanism 54 and the drum side clutch plate (not shown) are not in contact with each other, and the connection between the input side hub 51 and the drum 52 is released. Yes. The second input side clutch plate (not shown) of the second clutch mechanism 55 and the reverse shaft side clutch plate (not shown) are not in contact with each other, and the connection between the input side hub 51 and the reverse shaft side hub 53 is also released. That is, in the neutral state of the belt type continuously variable transmission 1, as shown in FIG. 2, the first clutch mechanism 54 releases the connection between the input shaft 111 and the primary pulley shaft 21, and the second clutch mechanism 55 is input. The connection between the shaft 111 and the reverse shaft 4 is released.

  Therefore, when the operation lever is positioned in the N range, the belt-type continuously variable transmission 1 is in a neutral state in which the input shaft 111 is not connected to the primary pulley shaft 21 and the reverse shaft 4 by the rotation direction switching mechanism 5. When the belt type continuously variable transmission 1 is in a neutral state, the output torque of the internal combustion engine 100 input to the input shaft 111 is transmitted to either the primary pulley shaft 21 or the secondary pulley shaft 31 via the rotation direction switching mechanism 5. Is not transmitted. As a result, the output torque of the internal combustion engine 100 is not transmitted to the wheels 150 and 150 via the belt-type continuously variable transmission 1, and the vehicle does not move forward or backward.

  As described above, in the belt type continuously variable transmission 1 according to the present invention, the output torque of the internal combustion engine 100 that is the driving force input to the input shaft 111 is used as the secondary pulley, without using the planetary gear mechanism. The rotation direction transmitted to the pulley 3 can be switched. Further, in the belt type continuously variable transmission 1 according to the present invention, the state in which the output torque of the internal combustion engine 100 input to the input shaft 111 is transmitted to the secondary pulley 3 in the same rotational direction and the state in which it is transmitted in the reverse rotational direction is a gear. This eliminates the need for the intermediate shaft required for the manual rotation direction switching device realized in Therefore, the number of parts can be reduced as compared with a rotation direction switching device including a conventional planetary gear mechanism, a forward clutch and a reverse brake, and a manual rotation direction switching device. Thereby, size reduction, cost reduction, and weight reduction can be achieved.

It is a figure (neutral state) which shows the structural example of the belt-type continuously variable transmission concerning this invention. It is operation | movement explanatory drawing (same rotation direction state) of the belt-type continuously variable transmission concerning this invention. It is operation | movement explanatory drawing (a reverse rotation direction state) of the belt-type continuously variable transmission concerning this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Belt type continuously variable transmission 2 Primary pulley 21 Primary pulley shaft 22 Primary fixed sheave 23 Primary movable sheave 23a Back surface 23b Protrusion 24 Primary hydraulic chamber 25, 26 Bearing 27 Primary groove 28 Primary partition 3 Secondary pulley 31 Secondary pulley shaft 32 Secondary Fixed sheave 33 Secondary movable sheave 33a Rear surface 33b Protruding portion 34 Secondary hydraulic chamber 35, 36 Bearing 37 Secondary groove 38 Secondary partition 4 Reverse shaft 5 Rotation direction switching mechanism 51 Input side hub 52 Drum 53 Reverse shaft side hub 54 First clutch mechanism ( First connection release means)
55 Second clutch mechanism (second coupling release means)
56 Reverse drive gear (Reverse drive force transmission means)
57 Reverse driven gear (reverse driving force transmission means)
6 Needle bearing 100 Internal combustion engine 101 Crankshaft 110 Torque converter 111 Input shaft 120 Power transmission path 130 Final reduction gear 140 Drive shaft 150 Wheel

Claims (3)

Provided with two pulleys that transmit driving force from one to the other by sandwiching a belt between a fixed sheave fixed to the pulley shaft and a movable sheave supported so as to be movable in the axial direction with respect to the pulley shaft In belt type continuously variable transmission,
A first connection releasing means for connecting the one pulley shaft and the input shaft to which the driving force is input, or for releasing the connection;
A second connecting / releasing means for connecting or releasing the connection between the reverse shaft rotatably supported and the input shaft;
Reverse driving force transmission means for connecting the reverse shaft and the other pulley shaft by reversing the rotation direction of the reverse shaft and the rotation direction of the other pulley shaft;
A belt-type continuously variable transmission. The same rotational direction state in which the first connection release means connects the one pulley shaft and the input shaft, and the second connection release means releases the connection between the reverse shaft and the input shaft,
A reverse rotation direction state in which the first connection release means releases the connection between the one pulley shaft and the input shaft, and the second connection release means connects the reverse shaft and the input shaft;
A neutral state in which the first connection release means releases the connection between the one pulley shaft and the input shaft, and the second connection release means releases the connection between the reverse shaft and the input shaft;
The belt type continuously variable transmission according to claim 1, wherein any one of the following states is configured. The reverse shaft is arranged concentrically with the one pulley shaft, and is rotatably supported by the one pulley shaft,
The first connection release means is a first clutch mechanism for connecting the input side hub fixed to the input shaft and the drum fixed to the one pulley shaft, or releasing the connection.
The second connection release means is a second clutch mechanism for connecting the input side hub and a reverse shaft side hub fixed to the reverse shaft, or releasing the connection.
The reverse drive force transmission means includes a reverse drive gear fixed to the reverse shaft, and a reverse driven gear meshed with the reverse drive gear and fixed to the other pulley shaft. Item 3. The belt type continuously variable transmission according to Item 1 or 2.

Images